17 #define SSH1_MSG_DISCONNECT 1 /* 0x1 */
18 #define SSH1_SMSG_PUBLIC_KEY 2 /* 0x2 */
19 #define SSH1_CMSG_SESSION_KEY 3 /* 0x3 */
20 #define SSH1_CMSG_USER 4 /* 0x4 */
21 #define SSH1_CMSG_AUTH_RSA 6 /* 0x6 */
22 #define SSH1_SMSG_AUTH_RSA_CHALLENGE 7 /* 0x7 */
23 #define SSH1_CMSG_AUTH_RSA_RESPONSE 8 /* 0x8 */
24 #define SSH1_CMSG_AUTH_PASSWORD 9 /* 0x9 */
25 #define SSH1_CMSG_REQUEST_PTY 10 /* 0xa */
26 #define SSH1_CMSG_WINDOW_SIZE 11 /* 0xb */
27 #define SSH1_CMSG_EXEC_SHELL 12 /* 0xc */
28 #define SSH1_CMSG_EXEC_CMD 13 /* 0xd */
29 #define SSH1_SMSG_SUCCESS 14 /* 0xe */
30 #define SSH1_SMSG_FAILURE 15 /* 0xf */
31 #define SSH1_CMSG_STDIN_DATA 16 /* 0x10 */
32 #define SSH1_SMSG_STDOUT_DATA 17 /* 0x11 */
33 #define SSH1_SMSG_STDERR_DATA 18 /* 0x12 */
34 #define SSH1_CMSG_EOF 19 /* 0x13 */
35 #define SSH1_SMSG_EXIT_STATUS 20 /* 0x14 */
36 #define SSH1_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* 0x15 */
37 #define SSH1_MSG_CHANNEL_OPEN_FAILURE 22 /* 0x16 */
38 #define SSH1_MSG_CHANNEL_DATA 23 /* 0x17 */
39 #define SSH1_MSG_CHANNEL_CLOSE 24 /* 0x18 */
40 #define SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* 0x19 */
41 #define SSH1_SMSG_X11_OPEN 27 /* 0x1b */
42 #define SSH1_CMSG_PORT_FORWARD_REQUEST 28 /* 0x1c */
43 #define SSH1_MSG_PORT_OPEN 29 /* 0x1d */
44 #define SSH1_CMSG_AGENT_REQUEST_FORWARDING 30 /* 0x1e */
45 #define SSH1_SMSG_AGENT_OPEN 31 /* 0x1f */
46 #define SSH1_MSG_IGNORE 32 /* 0x20 */
47 #define SSH1_CMSG_EXIT_CONFIRMATION 33 /* 0x21 */
48 #define SSH1_CMSG_X11_REQUEST_FORWARDING 34 /* 0x22 */
49 #define SSH1_CMSG_AUTH_RHOSTS_RSA 35 /* 0x23 */
50 #define SSH1_MSG_DEBUG 36 /* 0x24 */
51 #define SSH1_CMSG_REQUEST_COMPRESSION 37 /* 0x25 */
52 #define SSH1_CMSG_AUTH_TIS 39 /* 0x27 */
53 #define SSH1_SMSG_AUTH_TIS_CHALLENGE 40 /* 0x28 */
54 #define SSH1_CMSG_AUTH_TIS_RESPONSE 41 /* 0x29 */
55 #define SSH1_CMSG_AUTH_CCARD 70 /* 0x46 */
56 #define SSH1_SMSG_AUTH_CCARD_CHALLENGE 71 /* 0x47 */
57 #define SSH1_CMSG_AUTH_CCARD_RESPONSE 72 /* 0x48 */
59 #define SSH1_AUTH_TIS 5 /* 0x5 */
60 #define SSH1_AUTH_CCARD 16 /* 0x10 */
62 #define SSH1_PROTOFLAG_SCREEN_NUMBER 1 /* 0x1 */
63 /* Mask for protoflags we will echo back to server if seen */
64 #define SSH1_PROTOFLAGS_SUPPORTED 0 /* 0x1 */
66 #define SSH2_MSG_DISCONNECT 1 /* 0x1 */
67 #define SSH2_MSG_IGNORE 2 /* 0x2 */
68 #define SSH2_MSG_UNIMPLEMENTED 3 /* 0x3 */
69 #define SSH2_MSG_DEBUG 4 /* 0x4 */
70 #define SSH2_MSG_SERVICE_REQUEST 5 /* 0x5 */
71 #define SSH2_MSG_SERVICE_ACCEPT 6 /* 0x6 */
72 #define SSH2_MSG_KEXINIT 20 /* 0x14 */
73 #define SSH2_MSG_NEWKEYS 21 /* 0x15 */
74 #define SSH2_MSG_KEXDH_INIT 30 /* 0x1e */
75 #define SSH2_MSG_KEXDH_REPLY 31 /* 0x1f */
76 #define SSH2_MSG_KEX_DH_GEX_REQUEST 30 /* 0x1e */
77 #define SSH2_MSG_KEX_DH_GEX_GROUP 31 /* 0x1f */
78 #define SSH2_MSG_KEX_DH_GEX_INIT 32 /* 0x20 */
79 #define SSH2_MSG_KEX_DH_GEX_REPLY 33 /* 0x21 */
80 #define SSH2_MSG_USERAUTH_REQUEST 50 /* 0x32 */
81 #define SSH2_MSG_USERAUTH_FAILURE 51 /* 0x33 */
82 #define SSH2_MSG_USERAUTH_SUCCESS 52 /* 0x34 */
83 #define SSH2_MSG_USERAUTH_BANNER 53 /* 0x35 */
84 #define SSH2_MSG_USERAUTH_PK_OK 60 /* 0x3c */
85 #define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ 60 /* 0x3c */
86 #define SSH2_MSG_USERAUTH_INFO_REQUEST 60 /* 0x3c */
87 #define SSH2_MSG_USERAUTH_INFO_RESPONSE 61 /* 0x3d */
88 #define SSH2_MSG_GLOBAL_REQUEST 80 /* 0x50 */
89 #define SSH2_MSG_REQUEST_SUCCESS 81 /* 0x51 */
90 #define SSH2_MSG_REQUEST_FAILURE 82 /* 0x52 */
91 #define SSH2_MSG_CHANNEL_OPEN 90 /* 0x5a */
92 #define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION 91 /* 0x5b */
93 #define SSH2_MSG_CHANNEL_OPEN_FAILURE 92 /* 0x5c */
94 #define SSH2_MSG_CHANNEL_WINDOW_ADJUST 93 /* 0x5d */
95 #define SSH2_MSG_CHANNEL_DATA 94 /* 0x5e */
96 #define SSH2_MSG_CHANNEL_EXTENDED_DATA 95 /* 0x5f */
97 #define SSH2_MSG_CHANNEL_EOF 96 /* 0x60 */
98 #define SSH2_MSG_CHANNEL_CLOSE 97 /* 0x61 */
99 #define SSH2_MSG_CHANNEL_REQUEST 98 /* 0x62 */
100 #define SSH2_MSG_CHANNEL_SUCCESS 99 /* 0x63 */
101 #define SSH2_MSG_CHANNEL_FAILURE 100 /* 0x64 */
104 * Packet type contexts, so that ssh2_pkt_type can correctly decode
105 * the ambiguous type numbers back into the correct type strings.
107 #define SSH2_PKTCTX_DHGROUP 0x0001
108 #define SSH2_PKTCTX_DHGEX 0x0002
109 #define SSH2_PKTCTX_KEX_MASK 0x000F
110 #define SSH2_PKTCTX_PUBLICKEY 0x0010
111 #define SSH2_PKTCTX_PASSWORD 0x0020
112 #define SSH2_PKTCTX_KBDINTER 0x0040
113 #define SSH2_PKTCTX_AUTH_MASK 0x00F0
115 #define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT 1 /* 0x1 */
116 #define SSH2_DISCONNECT_PROTOCOL_ERROR 2 /* 0x2 */
117 #define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED 3 /* 0x3 */
118 #define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED 4 /* 0x4 */
119 #define SSH2_DISCONNECT_MAC_ERROR 5 /* 0x5 */
120 #define SSH2_DISCONNECT_COMPRESSION_ERROR 6 /* 0x6 */
121 #define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE 7 /* 0x7 */
122 #define SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED 8 /* 0x8 */
123 #define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE 9 /* 0x9 */
124 #define SSH2_DISCONNECT_CONNECTION_LOST 10 /* 0xa */
125 #define SSH2_DISCONNECT_BY_APPLICATION 11 /* 0xb */
126 #define SSH2_DISCONNECT_TOO_MANY_CONNECTIONS 12 /* 0xc */
127 #define SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER 13 /* 0xd */
128 #define SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE 14 /* 0xe */
129 #define SSH2_DISCONNECT_ILLEGAL_USER_NAME 15 /* 0xf */
131 static const char *const ssh2_disconnect_reasons
[] = {
133 "SSH_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT",
134 "SSH_DISCONNECT_PROTOCOL_ERROR",
135 "SSH_DISCONNECT_KEY_EXCHANGE_FAILED",
136 "SSH_DISCONNECT_HOST_AUTHENTICATION_FAILED",
137 "SSH_DISCONNECT_MAC_ERROR",
138 "SSH_DISCONNECT_COMPRESSION_ERROR",
139 "SSH_DISCONNECT_SERVICE_NOT_AVAILABLE",
140 "SSH_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED",
141 "SSH_DISCONNECT_HOST_KEY_NOT_VERIFIABLE",
142 "SSH_DISCONNECT_CONNECTION_LOST",
143 "SSH_DISCONNECT_BY_APPLICATION",
144 "SSH_DISCONNECT_TOO_MANY_CONNECTIONS",
145 "SSH_DISCONNECT_AUTH_CANCELLED_BY_USER",
146 "SSH_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE",
147 "SSH_DISCONNECT_ILLEGAL_USER_NAME",
150 #define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1 /* 0x1 */
151 #define SSH2_OPEN_CONNECT_FAILED 2 /* 0x2 */
152 #define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3 /* 0x3 */
153 #define SSH2_OPEN_RESOURCE_SHORTAGE 4 /* 0x4 */
155 #define SSH2_EXTENDED_DATA_STDERR 1 /* 0x1 */
158 * Various remote-bug flags.
160 #define BUG_CHOKES_ON_SSH1_IGNORE 1
161 #define BUG_SSH2_HMAC 2
162 #define BUG_NEEDS_SSH1_PLAIN_PASSWORD 4
163 #define BUG_CHOKES_ON_RSA 8
164 #define BUG_SSH2_RSA_PADDING 16
165 #define BUG_SSH2_DERIVEKEY 32
166 #define BUG_SSH2_REKEY 64
167 #define BUG_SSH2_PK_SESSIONID 128
170 * Codes for terminal modes.
171 * Most of these are the same in SSH-1 and SSH-2.
172 * This list is derived from draft-ietf-secsh-connect-25 and
175 static const struct {
176 const char* const mode
;
178 enum { TTY_OP_CHAR
, TTY_OP_BOOL
} type
;
180 /* "V" prefix discarded for special characters relative to SSH specs */
181 { "INTR", 1, TTY_OP_CHAR
},
182 { "QUIT", 2, TTY_OP_CHAR
},
183 { "ERASE", 3, TTY_OP_CHAR
},
184 { "KILL", 4, TTY_OP_CHAR
},
185 { "EOF", 5, TTY_OP_CHAR
},
186 { "EOL", 6, TTY_OP_CHAR
},
187 { "EOL2", 7, TTY_OP_CHAR
},
188 { "START", 8, TTY_OP_CHAR
},
189 { "STOP", 9, TTY_OP_CHAR
},
190 { "SUSP", 10, TTY_OP_CHAR
},
191 { "DSUSP", 11, TTY_OP_CHAR
},
192 { "REPRINT", 12, TTY_OP_CHAR
},
193 { "WERASE", 13, TTY_OP_CHAR
},
194 { "LNEXT", 14, TTY_OP_CHAR
},
195 { "FLUSH", 15, TTY_OP_CHAR
},
196 { "SWTCH", 16, TTY_OP_CHAR
},
197 { "STATUS", 17, TTY_OP_CHAR
},
198 { "DISCARD", 18, TTY_OP_CHAR
},
199 { "IGNPAR", 30, TTY_OP_BOOL
},
200 { "PARMRK", 31, TTY_OP_BOOL
},
201 { "INPCK", 32, TTY_OP_BOOL
},
202 { "ISTRIP", 33, TTY_OP_BOOL
},
203 { "INLCR", 34, TTY_OP_BOOL
},
204 { "IGNCR", 35, TTY_OP_BOOL
},
205 { "ICRNL", 36, TTY_OP_BOOL
},
206 { "IUCLC", 37, TTY_OP_BOOL
},
207 { "IXON", 38, TTY_OP_BOOL
},
208 { "IXANY", 39, TTY_OP_BOOL
},
209 { "IXOFF", 40, TTY_OP_BOOL
},
210 { "IMAXBEL", 41, TTY_OP_BOOL
},
211 { "ISIG", 50, TTY_OP_BOOL
},
212 { "ICANON", 51, TTY_OP_BOOL
},
213 { "XCASE", 52, TTY_OP_BOOL
},
214 { "ECHO", 53, TTY_OP_BOOL
},
215 { "ECHOE", 54, TTY_OP_BOOL
},
216 { "ECHOK", 55, TTY_OP_BOOL
},
217 { "ECHONL", 56, TTY_OP_BOOL
},
218 { "NOFLSH", 57, TTY_OP_BOOL
},
219 { "TOSTOP", 58, TTY_OP_BOOL
},
220 { "IEXTEN", 59, TTY_OP_BOOL
},
221 { "ECHOCTL", 60, TTY_OP_BOOL
},
222 { "ECHOKE", 61, TTY_OP_BOOL
},
223 { "PENDIN", 62, TTY_OP_BOOL
}, /* XXX is this a real mode? */
224 { "OPOST", 70, TTY_OP_BOOL
},
225 { "OLCUC", 71, TTY_OP_BOOL
},
226 { "ONLCR", 72, TTY_OP_BOOL
},
227 { "OCRNL", 73, TTY_OP_BOOL
},
228 { "ONOCR", 74, TTY_OP_BOOL
},
229 { "ONLRET", 75, TTY_OP_BOOL
},
230 { "CS7", 90, TTY_OP_BOOL
},
231 { "CS8", 91, TTY_OP_BOOL
},
232 { "PARENB", 92, TTY_OP_BOOL
},
233 { "PARODD", 93, TTY_OP_BOOL
}
236 /* Miscellaneous other tty-related constants. */
237 #define SSH_TTY_OP_END 0
238 /* The opcodes for ISPEED/OSPEED differ between SSH-1 and SSH-2. */
239 #define SSH1_TTY_OP_ISPEED 192
240 #define SSH1_TTY_OP_OSPEED 193
241 #define SSH2_TTY_OP_ISPEED 128
242 #define SSH2_TTY_OP_OSPEED 129
244 /* Helper functions for parsing tty-related config. */
245 static unsigned int ssh_tty_parse_specchar(char *s
)
250 ret
= ctrlparse(s
, &next
);
251 if (!next
) ret
= s
[0];
253 ret
= 255; /* special value meaning "don't set" */
257 static unsigned int ssh_tty_parse_boolean(char *s
)
259 if (stricmp(s
, "yes") == 0 ||
260 stricmp(s
, "on") == 0 ||
261 stricmp(s
, "true") == 0 ||
262 stricmp(s
, "+") == 0)
264 else if (stricmp(s
, "no") == 0 ||
265 stricmp(s
, "off") == 0 ||
266 stricmp(s
, "false") == 0 ||
267 stricmp(s
, "-") == 0)
268 return 0; /* false */
270 return (atoi(s
) != 0);
273 #define translate(x) if (type == x) return #x
274 #define translatec(x,ctx) if (type == x && (pkt_ctx & ctx)) return #x
275 static char *ssh1_pkt_type(int type
)
277 translate(SSH1_MSG_DISCONNECT
);
278 translate(SSH1_SMSG_PUBLIC_KEY
);
279 translate(SSH1_CMSG_SESSION_KEY
);
280 translate(SSH1_CMSG_USER
);
281 translate(SSH1_CMSG_AUTH_RSA
);
282 translate(SSH1_SMSG_AUTH_RSA_CHALLENGE
);
283 translate(SSH1_CMSG_AUTH_RSA_RESPONSE
);
284 translate(SSH1_CMSG_AUTH_PASSWORD
);
285 translate(SSH1_CMSG_REQUEST_PTY
);
286 translate(SSH1_CMSG_WINDOW_SIZE
);
287 translate(SSH1_CMSG_EXEC_SHELL
);
288 translate(SSH1_CMSG_EXEC_CMD
);
289 translate(SSH1_SMSG_SUCCESS
);
290 translate(SSH1_SMSG_FAILURE
);
291 translate(SSH1_CMSG_STDIN_DATA
);
292 translate(SSH1_SMSG_STDOUT_DATA
);
293 translate(SSH1_SMSG_STDERR_DATA
);
294 translate(SSH1_CMSG_EOF
);
295 translate(SSH1_SMSG_EXIT_STATUS
);
296 translate(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
);
297 translate(SSH1_MSG_CHANNEL_OPEN_FAILURE
);
298 translate(SSH1_MSG_CHANNEL_DATA
);
299 translate(SSH1_MSG_CHANNEL_CLOSE
);
300 translate(SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
);
301 translate(SSH1_SMSG_X11_OPEN
);
302 translate(SSH1_CMSG_PORT_FORWARD_REQUEST
);
303 translate(SSH1_MSG_PORT_OPEN
);
304 translate(SSH1_CMSG_AGENT_REQUEST_FORWARDING
);
305 translate(SSH1_SMSG_AGENT_OPEN
);
306 translate(SSH1_MSG_IGNORE
);
307 translate(SSH1_CMSG_EXIT_CONFIRMATION
);
308 translate(SSH1_CMSG_X11_REQUEST_FORWARDING
);
309 translate(SSH1_CMSG_AUTH_RHOSTS_RSA
);
310 translate(SSH1_MSG_DEBUG
);
311 translate(SSH1_CMSG_REQUEST_COMPRESSION
);
312 translate(SSH1_CMSG_AUTH_TIS
);
313 translate(SSH1_SMSG_AUTH_TIS_CHALLENGE
);
314 translate(SSH1_CMSG_AUTH_TIS_RESPONSE
);
315 translate(SSH1_CMSG_AUTH_CCARD
);
316 translate(SSH1_SMSG_AUTH_CCARD_CHALLENGE
);
317 translate(SSH1_CMSG_AUTH_CCARD_RESPONSE
);
320 static char *ssh2_pkt_type(int pkt_ctx
, int type
)
322 translate(SSH2_MSG_DISCONNECT
);
323 translate(SSH2_MSG_IGNORE
);
324 translate(SSH2_MSG_UNIMPLEMENTED
);
325 translate(SSH2_MSG_DEBUG
);
326 translate(SSH2_MSG_SERVICE_REQUEST
);
327 translate(SSH2_MSG_SERVICE_ACCEPT
);
328 translate(SSH2_MSG_KEXINIT
);
329 translate(SSH2_MSG_NEWKEYS
);
330 translatec(SSH2_MSG_KEXDH_INIT
, SSH2_PKTCTX_DHGROUP
);
331 translatec(SSH2_MSG_KEXDH_REPLY
, SSH2_PKTCTX_DHGROUP
);
332 translatec(SSH2_MSG_KEX_DH_GEX_REQUEST
, SSH2_PKTCTX_DHGEX
);
333 translatec(SSH2_MSG_KEX_DH_GEX_GROUP
, SSH2_PKTCTX_DHGEX
);
334 translatec(SSH2_MSG_KEX_DH_GEX_INIT
, SSH2_PKTCTX_DHGEX
);
335 translatec(SSH2_MSG_KEX_DH_GEX_REPLY
, SSH2_PKTCTX_DHGEX
);
336 translate(SSH2_MSG_USERAUTH_REQUEST
);
337 translate(SSH2_MSG_USERAUTH_FAILURE
);
338 translate(SSH2_MSG_USERAUTH_SUCCESS
);
339 translate(SSH2_MSG_USERAUTH_BANNER
);
340 translatec(SSH2_MSG_USERAUTH_PK_OK
, SSH2_PKTCTX_PUBLICKEY
);
341 translatec(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ
, SSH2_PKTCTX_PASSWORD
);
342 translatec(SSH2_MSG_USERAUTH_INFO_REQUEST
, SSH2_PKTCTX_KBDINTER
);
343 translatec(SSH2_MSG_USERAUTH_INFO_RESPONSE
, SSH2_PKTCTX_KBDINTER
);
344 translate(SSH2_MSG_GLOBAL_REQUEST
);
345 translate(SSH2_MSG_REQUEST_SUCCESS
);
346 translate(SSH2_MSG_REQUEST_FAILURE
);
347 translate(SSH2_MSG_CHANNEL_OPEN
);
348 translate(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
);
349 translate(SSH2_MSG_CHANNEL_OPEN_FAILURE
);
350 translate(SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
351 translate(SSH2_MSG_CHANNEL_DATA
);
352 translate(SSH2_MSG_CHANNEL_EXTENDED_DATA
);
353 translate(SSH2_MSG_CHANNEL_EOF
);
354 translate(SSH2_MSG_CHANNEL_CLOSE
);
355 translate(SSH2_MSG_CHANNEL_REQUEST
);
356 translate(SSH2_MSG_CHANNEL_SUCCESS
);
357 translate(SSH2_MSG_CHANNEL_FAILURE
);
363 /* Enumeration values for fields in SSH-1 packets */
365 PKT_END
, PKT_INT
, PKT_CHAR
, PKT_DATA
, PKT_STR
, PKT_BIGNUM
,
366 /* These values are for communicating relevant semantics of
367 * fields to the packet logging code. */
368 PKTT_OTHER
, PKTT_PASSWORD
, PKTT_DATA
372 * Coroutine mechanics for the sillier bits of the code. If these
373 * macros look impenetrable to you, you might find it helpful to
376 * http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
378 * which explains the theory behind these macros.
380 * In particular, if you are getting `case expression not constant'
381 * errors when building with MS Visual Studio, this is because MS's
382 * Edit and Continue debugging feature causes their compiler to
383 * violate ANSI C. To disable Edit and Continue debugging:
385 * - right-click ssh.c in the FileView
387 * - select the C/C++ tab and the General category
388 * - under `Debug info:', select anything _other_ than `Program
389 * Database for Edit and Continue'.
391 #define crBegin(v) { int *crLine = &v; switch(v) { case 0:;
394 if (!ssh->t) ssh->t = snew(struct t); \
396 #define crFinish(z) } *crLine = 0; return (z); }
397 #define crFinishV } *crLine = 0; return; }
398 #define crReturn(z) \
400 *crLine =__LINE__; return (z); case __LINE__:;\
404 *crLine=__LINE__; return; case __LINE__:;\
406 #define crStop(z) do{ *crLine = 0; return (z); }while(0)
407 #define crStopV do{ *crLine = 0; return; }while(0)
408 #define crWaitUntil(c) do { crReturn(0); } while (!(c))
409 #define crWaitUntilV(c) do { crReturnV; } while (!(c))
411 typedef struct ssh_tag
*Ssh
;
414 static struct Packet
*ssh1_pkt_init(int pkt_type
);
415 static struct Packet
*ssh2_pkt_init(int pkt_type
);
416 static void ssh_pkt_ensure(struct Packet
*, int length
);
417 static void ssh_pkt_adddata(struct Packet
*, void *data
, int len
);
418 static void ssh_pkt_addbyte(struct Packet
*, unsigned char value
);
419 static void ssh2_pkt_addbool(struct Packet
*, unsigned char value
);
420 static void ssh_pkt_adduint32(struct Packet
*, unsigned long value
);
421 static void ssh_pkt_addstring_start(struct Packet
*);
422 static void ssh_pkt_addstring_str(struct Packet
*, char *data
);
423 static void ssh_pkt_addstring_data(struct Packet
*, char *data
, int len
);
424 static void ssh_pkt_addstring(struct Packet
*, char *data
);
425 static unsigned char *ssh2_mpint_fmt(Bignum b
, int *len
);
426 static void ssh1_pkt_addmp(struct Packet
*, Bignum b
);
427 static void ssh2_pkt_addmp(struct Packet
*, Bignum b
);
428 static int ssh2_pkt_construct(Ssh
, struct Packet
*);
429 static void ssh2_pkt_send(Ssh
, struct Packet
*);
430 static void ssh2_pkt_send_noqueue(Ssh
, struct Packet
*);
431 static int do_ssh1_login(Ssh ssh
, unsigned char *in
, int inlen
,
432 struct Packet
*pktin
);
433 static void do_ssh2_authconn(Ssh ssh
, unsigned char *in
, int inlen
,
434 struct Packet
*pktin
);
437 * Buffer management constants. There are several of these for
438 * various different purposes:
440 * - SSH1_BUFFER_LIMIT is the amount of backlog that must build up
441 * on a local data stream before we throttle the whole SSH
442 * connection (in SSH-1 only). Throttling the whole connection is
443 * pretty drastic so we set this high in the hope it won't
446 * - SSH_MAX_BACKLOG is the amount of backlog that must build up
447 * on the SSH connection itself before we defensively throttle
448 * _all_ local data streams. This is pretty drastic too (though
449 * thankfully unlikely in SSH-2 since the window mechanism should
450 * ensure that the server never has any need to throttle its end
451 * of the connection), so we set this high as well.
453 * - OUR_V2_WINSIZE is the maximum window size we present on SSH-2
457 #define SSH1_BUFFER_LIMIT 32768
458 #define SSH_MAX_BACKLOG 32768
459 #define OUR_V2_WINSIZE 16384
460 #define OUR_V2_MAXPKT 0x4000UL
462 const static struct ssh_signkey
*hostkey_algs
[] = { &ssh_rsa
, &ssh_dss
};
464 const static struct ssh_mac
*macs
[] = {
467 const static struct ssh_mac
*buggymacs
[] = {
468 &ssh_sha1_buggy
, &ssh_md5
471 static void *ssh_comp_none_init(void)
475 static void ssh_comp_none_cleanup(void *handle
)
478 static int ssh_comp_none_block(void *handle
, unsigned char *block
, int len
,
479 unsigned char **outblock
, int *outlen
)
483 static int ssh_comp_none_disable(void *handle
)
487 const static struct ssh_compress ssh_comp_none
= {
489 ssh_comp_none_init
, ssh_comp_none_cleanup
, ssh_comp_none_block
,
490 ssh_comp_none_init
, ssh_comp_none_cleanup
, ssh_comp_none_block
,
491 ssh_comp_none_disable
, NULL
493 extern const struct ssh_compress ssh_zlib
;
494 const static struct ssh_compress
*compressions
[] = {
495 &ssh_zlib
, &ssh_comp_none
498 enum { /* channel types */
503 CHAN_SOCKDATA_DORMANT
/* one the remote hasn't confirmed */
507 * 2-3-4 tree storing channels.
510 Ssh ssh
; /* pointer back to main context */
511 unsigned remoteid
, localid
;
513 /* True if we opened this channel but server hasn't confirmed. */
516 * In SSH-1, this value contains four bits:
518 * 1 We have sent SSH1_MSG_CHANNEL_CLOSE.
519 * 2 We have sent SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION.
520 * 4 We have received SSH1_MSG_CHANNEL_CLOSE.
521 * 8 We have received SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION.
523 * A channel is completely finished with when all four bits are set.
527 struct ssh1_data_channel
{
530 struct ssh2_data_channel
{
532 unsigned remwindow
, remmaxpkt
;
537 struct ssh_agent_channel
{
538 unsigned char *message
;
539 unsigned char msglen
[4];
540 unsigned lensofar
, totallen
;
542 struct ssh_x11_channel
{
545 struct ssh_pfd_channel
{
552 * 2-3-4 tree storing remote->local port forwardings. SSH-1 and SSH-2
553 * use this structure in different ways, reflecting SSH-2's
554 * altogether saner approach to port forwarding.
556 * In SSH-1, you arrange a remote forwarding by sending the server
557 * the remote port number, and the local destination host:port.
558 * When a connection comes in, the server sends you back that
559 * host:port pair, and you connect to it. This is a ready-made
560 * security hole if you're not on the ball: a malicious server
561 * could send you back _any_ host:port pair, so if you trustingly
562 * connect to the address it gives you then you've just opened the
563 * entire inside of your corporate network just by connecting
564 * through it to a dodgy SSH server. Hence, we must store a list of
565 * host:port pairs we _are_ trying to forward to, and reject a
566 * connection request from the server if it's not in the list.
568 * In SSH-2, each side of the connection minds its own business and
569 * doesn't send unnecessary information to the other. You arrange a
570 * remote forwarding by sending the server just the remote port
571 * number. When a connection comes in, the server tells you which
572 * of its ports was connected to; and _you_ have to remember what
573 * local host:port pair went with that port number.
575 * Hence, in SSH-1 this structure is indexed by destination
576 * host:port pair, whereas in SSH-2 it is indexed by source port.
578 struct ssh_portfwd
; /* forward declaration */
580 struct ssh_rportfwd
{
581 unsigned sport
, dport
;
584 struct ssh_portfwd
*pfrec
;
586 #define free_rportfwd(pf) ( \
587 ((pf) ? (sfree((pf)->sportdesc)) : (void)0 ), sfree(pf) )
590 * Separately to the rportfwd tree (which is for looking up port
591 * open requests from the server), a tree of _these_ structures is
592 * used to keep track of all the currently open port forwardings,
593 * so that we can reconfigure in mid-session if the user requests
597 enum { DESTROY
, KEEP
, CREATE
} status
;
599 unsigned sport
, dport
;
602 struct ssh_rportfwd
*remote
;
606 #define free_portfwd(pf) ( \
607 ((pf) ? (sfree((pf)->saddr), sfree((pf)->daddr), \
608 sfree((pf)->sserv), sfree((pf)->dserv)) : (void)0 ), sfree(pf) )
611 long length
; /* length of `data' actually used */
612 long forcepad
; /* SSH-2: force padding to at least this length */
613 int type
; /* only used for incoming packets */
614 unsigned long sequence
; /* SSH-2 incoming sequence number */
615 unsigned char *data
; /* allocated storage */
616 unsigned char *body
; /* offset of payload within `data' */
617 long savedpos
; /* temporary index into `data' (for strings) */
618 long maxlen
; /* amount of storage allocated for `data' */
619 long encrypted_len
; /* for SSH-2 total-size counting */
622 * State associated with packet logging
626 struct logblank_t
*blanks
;
629 static void ssh1_protocol(Ssh ssh
, void *vin
, int inlen
,
630 struct Packet
*pktin
);
631 static void ssh2_protocol(Ssh ssh
, void *vin
, int inlen
,
632 struct Packet
*pktin
);
633 static void ssh1_protocol_setup(Ssh ssh
);
634 static void ssh2_protocol_setup(Ssh ssh
);
635 static void ssh_size(void *handle
, int width
, int height
);
636 static void ssh_special(void *handle
, Telnet_Special
);
637 static int ssh2_try_send(struct ssh_channel
*c
);
638 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
, int len
);
639 static void ssh_throttle_all(Ssh ssh
, int enable
, int bufsize
);
640 static void ssh2_set_window(struct ssh_channel
*c
, unsigned newwin
);
641 static int ssh_sendbuffer(void *handle
);
642 static int ssh_do_close(Ssh ssh
, int notify_exit
);
643 static unsigned long ssh_pkt_getuint32(struct Packet
*pkt
);
644 static int ssh2_pkt_getbool(struct Packet
*pkt
);
645 static void ssh_pkt_getstring(struct Packet
*pkt
, char **p
, int *length
);
646 static void ssh2_timer(void *ctx
, long now
);
647 static int do_ssh2_transport(Ssh ssh
, void *vin
, int inlen
,
648 struct Packet
*pktin
);
650 struct rdpkt1_state_tag
{
651 long len
, pad
, biglen
, to_read
;
652 unsigned long realcrc
, gotcrc
;
656 struct Packet
*pktin
;
659 struct rdpkt2_state_tag
{
660 long len
, pad
, payload
, packetlen
, maclen
;
663 unsigned long incoming_sequence
;
664 struct Packet
*pktin
;
667 typedef void (*handler_fn_t
)(Ssh ssh
, struct Packet
*pktin
);
668 typedef void (*chandler_fn_t
)(Ssh ssh
, struct Packet
*pktin
, void *ctx
);
670 struct queued_handler
;
671 struct queued_handler
{
673 chandler_fn_t handler
;
675 struct queued_handler
*next
;
679 const struct plug_function_table
*fn
;
680 /* the above field _must_ be first in the structure */
682 SHA_State exhash
, exhashbase
;
689 unsigned char session_key
[32];
691 int v1_remote_protoflags
;
692 int v1_local_protoflags
;
693 int agentfwd_enabled
;
696 const struct ssh_cipher
*cipher
;
699 const struct ssh2_cipher
*cscipher
, *sccipher
;
700 void *cs_cipher_ctx
, *sc_cipher_ctx
;
701 const struct ssh_mac
*csmac
, *scmac
;
702 void *cs_mac_ctx
, *sc_mac_ctx
;
703 const struct ssh_compress
*cscomp
, *sccomp
;
704 void *cs_comp_ctx
, *sc_comp_ctx
;
705 const struct ssh_kex
*kex
;
706 const struct ssh_signkey
*hostkey
;
707 unsigned char v2_session_id
[20];
713 int echoing
, editing
;
717 int ospeed
, ispeed
; /* temporaries */
718 int term_width
, term_height
;
720 tree234
*channels
; /* indexed by local id */
721 struct ssh_channel
*mainchan
; /* primary session channel */
725 tree234
*rportfwds
, *portfwds
;
729 SSH_STATE_BEFORE_SIZE
,
735 int size_needed
, eof_needed
;
737 struct Packet
**queue
;
738 int queuelen
, queuesize
;
740 unsigned char *deferred_send_data
;
741 int deferred_len
, deferred_size
;
744 * Gross hack: pscp will try to start SFTP but fall back to
745 * scp1 if that fails. This variable is the means by which
746 * scp.c can reach into the SSH code and find out which one it
752 * Used for username and password input.
754 char *userpass_input_buffer
;
755 int userpass_input_buflen
;
756 int userpass_input_bufpos
;
757 int userpass_input_echo
;
764 int v1_throttle_count
;
767 int v1_stdout_throttling
;
768 unsigned long v2_outgoing_sequence
;
770 int ssh1_rdpkt_crstate
;
771 int ssh2_rdpkt_crstate
;
772 int do_ssh_init_crstate
;
773 int ssh_gotdata_crstate
;
774 int do_ssh1_login_crstate
;
775 int do_ssh1_connection_crstate
;
776 int do_ssh2_transport_crstate
;
777 int do_ssh2_authconn_crstate
;
779 void *do_ssh_init_state
;
780 void *do_ssh1_login_state
;
781 void *do_ssh2_transport_state
;
782 void *do_ssh2_authconn_state
;
784 struct rdpkt1_state_tag rdpkt1_state
;
785 struct rdpkt2_state_tag rdpkt2_state
;
787 /* SSH-1 and SSH-2 use this for different things, but both use it */
788 int protocol_initial_phase_done
;
790 void (*protocol
) (Ssh ssh
, void *vin
, int inlen
,
792 struct Packet
*(*s_rdpkt
) (Ssh ssh
, unsigned char **data
, int *datalen
);
795 * We maintain a full _copy_ of a Config structure here, not
796 * merely a pointer to it. That way, when we're passed a new
797 * one for reconfiguration, we can check the differences and
798 * potentially reconfigure port forwardings etc in mid-session.
803 * Used to transfer data back from async callbacks.
805 void *agent_response
;
806 int agent_response_len
;
810 * The SSH connection can be set as `frozen', meaning we are
811 * not currently accepting incoming data from the network. This
812 * is slightly more serious than setting the _socket_ as
813 * frozen, because we may already have had data passed to us
814 * from the network which we need to delay processing until
815 * after the freeze is lifted, so we also need a bufchain to
819 bufchain queued_incoming_data
;
822 * Dispatch table for packet types that we may have to deal
825 handler_fn_t packet_dispatch
[256];
828 * Queues of one-off handler functions for success/failure
829 * indications from a request.
831 struct queued_handler
*qhead
, *qtail
;
834 * This module deals with sending keepalives.
839 * Track incoming and outgoing data sizes and time, for
842 unsigned long incoming_data_size
, outgoing_data_size
, deferred_data_size
;
843 unsigned long max_data_size
;
845 long next_rekey
, last_rekey
;
846 char *deferred_rekey_reason
; /* points to STATIC string; don't free */
849 #define logevent(s) logevent(ssh->frontend, s)
851 /* logevent, only printf-formatted. */
852 static void logeventf(Ssh ssh
, const char *fmt
, ...)
858 buf
= dupvprintf(fmt
, ap
);
864 #define bombout(msg) \
866 char *text = dupprintf msg; \
867 ssh_do_close(ssh, FALSE); \
869 connection_fatal(ssh->frontend, "%s", text); \
873 /* Functions to leave bits out of the SSH packet log file. */
875 static void dont_log_password(Ssh ssh
, struct Packet
*pkt
, int blanktype
)
877 if (ssh
->cfg
.logomitpass
)
878 pkt
->logmode
= blanktype
;
881 static void dont_log_data(Ssh ssh
, struct Packet
*pkt
, int blanktype
)
883 if (ssh
->cfg
.logomitdata
)
884 pkt
->logmode
= blanktype
;
887 static void end_log_omission(Ssh ssh
, struct Packet
*pkt
)
889 pkt
->logmode
= PKTLOG_EMIT
;
892 /* Helper function for common bits of parsing cfg.ttymodes. */
893 static void parse_ttymodes(Ssh ssh
, char *modes
,
894 void (*do_mode
)(void *data
, char *mode
, char *val
),
898 char *t
= strchr(modes
, '\t');
899 char *m
= snewn(t
-modes
+1, char);
901 strncpy(m
, modes
, t
-modes
);
904 val
= get_ttymode(ssh
->frontend
, m
);
908 do_mode(data
, m
, val
);
911 modes
+= strlen(modes
) + 1;
915 static int ssh_channelcmp(void *av
, void *bv
)
917 struct ssh_channel
*a
= (struct ssh_channel
*) av
;
918 struct ssh_channel
*b
= (struct ssh_channel
*) bv
;
919 if (a
->localid
< b
->localid
)
921 if (a
->localid
> b
->localid
)
925 static int ssh_channelfind(void *av
, void *bv
)
927 unsigned *a
= (unsigned *) av
;
928 struct ssh_channel
*b
= (struct ssh_channel
*) bv
;
936 static int ssh_rportcmp_ssh1(void *av
, void *bv
)
938 struct ssh_rportfwd
*a
= (struct ssh_rportfwd
*) av
;
939 struct ssh_rportfwd
*b
= (struct ssh_rportfwd
*) bv
;
941 if ( (i
= strcmp(a
->dhost
, b
->dhost
)) != 0)
942 return i
< 0 ?
-1 : +1;
943 if (a
->dport
> b
->dport
)
945 if (a
->dport
< b
->dport
)
950 static int ssh_rportcmp_ssh2(void *av
, void *bv
)
952 struct ssh_rportfwd
*a
= (struct ssh_rportfwd
*) av
;
953 struct ssh_rportfwd
*b
= (struct ssh_rportfwd
*) bv
;
955 if (a
->sport
> b
->sport
)
957 if (a
->sport
< b
->sport
)
963 * Special form of strcmp which can cope with NULL inputs. NULL is
964 * defined to sort before even the empty string.
966 static int nullstrcmp(const char *a
, const char *b
)
968 if (a
== NULL
&& b
== NULL
)
977 static int ssh_portcmp(void *av
, void *bv
)
979 struct ssh_portfwd
*a
= (struct ssh_portfwd
*) av
;
980 struct ssh_portfwd
*b
= (struct ssh_portfwd
*) bv
;
982 if (a
->type
> b
->type
)
984 if (a
->type
< b
->type
)
986 if (a
->addressfamily
> b
->addressfamily
)
988 if (a
->addressfamily
< b
->addressfamily
)
990 if ( (i
= nullstrcmp(a
->saddr
, b
->saddr
)) != 0)
991 return i
< 0 ?
-1 : +1;
992 if (a
->sport
> b
->sport
)
994 if (a
->sport
< b
->sport
)
996 if (a
->type
!= 'D') {
997 if ( (i
= nullstrcmp(a
->daddr
, b
->daddr
)) != 0)
998 return i
< 0 ?
-1 : +1;
999 if (a
->dport
> b
->dport
)
1001 if (a
->dport
< b
->dport
)
1007 static int alloc_channel_id(Ssh ssh
)
1009 const unsigned CHANNEL_NUMBER_OFFSET
= 256;
1010 unsigned low
, high
, mid
;
1012 struct ssh_channel
*c
;
1015 * First-fit allocation of channel numbers: always pick the
1016 * lowest unused one. To do this, binary-search using the
1017 * counted B-tree to find the largest channel ID which is in a
1018 * contiguous sequence from the beginning. (Precisely
1019 * everything in that sequence must have ID equal to its tree
1020 * index plus CHANNEL_NUMBER_OFFSET.)
1022 tsize
= count234(ssh
->channels
);
1026 while (high
- low
> 1) {
1027 mid
= (high
+ low
) / 2;
1028 c
= index234(ssh
->channels
, mid
);
1029 if (c
->localid
== mid
+ CHANNEL_NUMBER_OFFSET
)
1030 low
= mid
; /* this one is fine */
1032 high
= mid
; /* this one is past it */
1035 * Now low points to either -1, or the tree index of the
1036 * largest ID in the initial sequence.
1039 unsigned i
= low
+ 1 + CHANNEL_NUMBER_OFFSET
;
1040 assert(NULL
== find234(ssh
->channels
, &i
, ssh_channelfind
));
1042 return low
+ 1 + CHANNEL_NUMBER_OFFSET
;
1045 static void c_write(Ssh ssh
, const char *buf
, int len
)
1047 if ((flags
& FLAG_STDERR
)) {
1049 for (i
= 0; i
< len
; i
++)
1051 fputc(buf
[i
], stderr
);
1054 from_backend(ssh
->frontend
, 1, buf
, len
);
1057 static void c_write_untrusted(Ssh ssh
, const char *buf
, int len
)
1060 for (i
= 0; i
< len
; i
++) {
1062 c_write(ssh
, "\r\n", 2);
1063 else if ((buf
[i
] & 0x60) || (buf
[i
] == '\r'))
1064 c_write(ssh
, buf
+ i
, 1);
1068 static void c_write_str(Ssh ssh
, const char *buf
)
1070 c_write(ssh
, buf
, strlen(buf
));
1073 static void ssh_free_packet(struct Packet
*pkt
)
1078 static struct Packet
*ssh_new_packet(void)
1080 struct Packet
*pkt
= snew(struct Packet
);
1082 pkt
->body
= pkt
->data
= NULL
;
1084 pkt
->logmode
= PKTLOG_EMIT
;
1092 * Collect incoming data in the incoming packet buffer.
1093 * Decipher and verify the packet when it is completely read.
1094 * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets.
1095 * Update the *data and *datalen variables.
1096 * Return a Packet structure when a packet is completed.
1098 static struct Packet
*ssh1_rdpkt(Ssh ssh
, unsigned char **data
, int *datalen
)
1100 struct rdpkt1_state_tag
*st
= &ssh
->rdpkt1_state
;
1102 crBegin(ssh
->ssh1_rdpkt_crstate
);
1104 st
->pktin
= ssh_new_packet();
1106 st
->pktin
->type
= 0;
1107 st
->pktin
->length
= 0;
1109 for (st
->i
= st
->len
= 0; st
->i
< 4; st
->i
++) {
1110 while ((*datalen
) == 0)
1112 st
->len
= (st
->len
<< 8) + **data
;
1113 (*data
)++, (*datalen
)--;
1116 st
->pad
= 8 - (st
->len
% 8);
1117 st
->biglen
= st
->len
+ st
->pad
;
1118 st
->pktin
->length
= st
->len
- 5;
1120 if (st
->biglen
< 0) {
1121 bombout(("Extremely large packet length from server suggests"
1122 " data stream corruption"));
1123 ssh_free_packet(st
->pktin
);
1127 st
->pktin
->maxlen
= st
->biglen
;
1128 st
->pktin
->data
= snewn(st
->biglen
+ APIEXTRA
, unsigned char);
1130 st
->to_read
= st
->biglen
;
1131 st
->p
= st
->pktin
->data
;
1132 while (st
->to_read
> 0) {
1133 st
->chunk
= st
->to_read
;
1134 while ((*datalen
) == 0)
1136 if (st
->chunk
> (*datalen
))
1137 st
->chunk
= (*datalen
);
1138 memcpy(st
->p
, *data
, st
->chunk
);
1140 *datalen
-= st
->chunk
;
1142 st
->to_read
-= st
->chunk
;
1145 if (ssh
->cipher
&& detect_attack(ssh
->crcda_ctx
, st
->pktin
->data
,
1146 st
->biglen
, NULL
)) {
1147 bombout(("Network attack (CRC compensation) detected!"));
1148 ssh_free_packet(st
->pktin
);
1153 ssh
->cipher
->decrypt(ssh
->v1_cipher_ctx
, st
->pktin
->data
, st
->biglen
);
1155 st
->realcrc
= crc32_compute(st
->pktin
->data
, st
->biglen
- 4);
1156 st
->gotcrc
= GET_32BIT(st
->pktin
->data
+ st
->biglen
- 4);
1157 if (st
->gotcrc
!= st
->realcrc
) {
1158 bombout(("Incorrect CRC received on packet"));
1159 ssh_free_packet(st
->pktin
);
1163 st
->pktin
->body
= st
->pktin
->data
+ st
->pad
+ 1;
1164 st
->pktin
->savedpos
= 0;
1166 if (ssh
->v1_compressing
) {
1167 unsigned char *decompblk
;
1169 if (!zlib_decompress_block(ssh
->sc_comp_ctx
,
1170 st
->pktin
->body
- 1, st
->pktin
->length
+ 1,
1171 &decompblk
, &decomplen
)) {
1172 bombout(("Zlib decompression encountered invalid data"));
1173 ssh_free_packet(st
->pktin
);
1177 if (st
->pktin
->maxlen
< st
->pad
+ decomplen
) {
1178 st
->pktin
->maxlen
= st
->pad
+ decomplen
;
1179 st
->pktin
->data
= sresize(st
->pktin
->data
,
1180 st
->pktin
->maxlen
+ APIEXTRA
,
1182 st
->pktin
->body
= st
->pktin
->data
+ st
->pad
+ 1;
1185 memcpy(st
->pktin
->body
- 1, decompblk
, decomplen
);
1187 st
->pktin
->length
= decomplen
- 1;
1190 st
->pktin
->type
= st
->pktin
->body
[-1];
1193 * Log incoming packet, possibly omitting sensitive fields.
1197 struct logblank_t blank
;
1198 if (ssh
->cfg
.logomitdata
) {
1199 int do_blank
= FALSE
, blank_prefix
= 0;
1200 /* "Session data" packets - omit the data field */
1201 if ((st
->pktin
->type
== SSH1_SMSG_STDOUT_DATA
) ||
1202 (st
->pktin
->type
== SSH1_SMSG_STDERR_DATA
)) {
1203 do_blank
= TRUE
; blank_prefix
= 0;
1204 } else if (st
->pktin
->type
== SSH1_MSG_CHANNEL_DATA
) {
1205 do_blank
= TRUE
; blank_prefix
= 4;
1208 blank
.offset
= blank_prefix
;
1209 blank
.len
= st
->pktin
->length
;
1210 blank
.type
= PKTLOG_OMIT
;
1214 log_packet(ssh
->logctx
,
1215 PKT_INCOMING
, st
->pktin
->type
,
1216 ssh1_pkt_type(st
->pktin
->type
),
1217 st
->pktin
->body
, st
->pktin
->length
,
1221 crFinish(st
->pktin
);
1224 static struct Packet
*ssh2_rdpkt(Ssh ssh
, unsigned char **data
, int *datalen
)
1226 struct rdpkt2_state_tag
*st
= &ssh
->rdpkt2_state
;
1228 crBegin(ssh
->ssh2_rdpkt_crstate
);
1230 st
->pktin
= ssh_new_packet();
1232 st
->pktin
->type
= 0;
1233 st
->pktin
->length
= 0;
1235 st
->cipherblk
= ssh
->sccipher
->blksize
;
1238 if (st
->cipherblk
< 8)
1241 st
->pktin
->data
= snewn(st
->cipherblk
+ APIEXTRA
, unsigned char);
1244 * Acquire and decrypt the first block of the packet. This will
1245 * contain the length and padding details.
1247 for (st
->i
= st
->len
= 0; st
->i
< st
->cipherblk
; st
->i
++) {
1248 while ((*datalen
) == 0)
1250 st
->pktin
->data
[st
->i
] = *(*data
)++;
1255 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
1256 st
->pktin
->data
, st
->cipherblk
);
1259 * Now get the length and padding figures.
1261 st
->len
= GET_32BIT(st
->pktin
->data
);
1262 st
->pad
= st
->pktin
->data
[4];
1265 * _Completely_ silly lengths should be stomped on before they
1266 * do us any more damage.
1268 if (st
->len
< 0 || st
->pad
< 0 || st
->len
+ st
->pad
< 0) {
1269 bombout(("Incoming packet was garbled on decryption"));
1270 ssh_free_packet(st
->pktin
);
1275 * This enables us to deduce the payload length.
1277 st
->payload
= st
->len
- st
->pad
- 1;
1279 st
->pktin
->length
= st
->payload
+ 5;
1282 * So now we can work out the total packet length.
1284 st
->packetlen
= st
->len
+ 4;
1285 st
->maclen
= ssh
->scmac ? ssh
->scmac
->len
: 0;
1288 * Allocate memory for the rest of the packet.
1290 st
->pktin
->maxlen
= st
->packetlen
+ st
->maclen
;
1291 st
->pktin
->data
= sresize(st
->pktin
->data
,
1292 st
->pktin
->maxlen
+ APIEXTRA
,
1296 * Read and decrypt the remainder of the packet.
1298 for (st
->i
= st
->cipherblk
; st
->i
< st
->packetlen
+ st
->maclen
;
1300 while ((*datalen
) == 0)
1302 st
->pktin
->data
[st
->i
] = *(*data
)++;
1305 /* Decrypt everything _except_ the MAC. */
1307 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
1308 st
->pktin
->data
+ st
->cipherblk
,
1309 st
->packetlen
- st
->cipherblk
);
1311 st
->pktin
->encrypted_len
= st
->packetlen
;
1317 && !ssh
->scmac
->verify(ssh
->sc_mac_ctx
, st
->pktin
->data
, st
->len
+ 4,
1318 st
->incoming_sequence
)) {
1319 bombout(("Incorrect MAC received on packet"));
1320 ssh_free_packet(st
->pktin
);
1324 st
->pktin
->sequence
= st
->incoming_sequence
++;
1327 * Decompress packet payload.
1330 unsigned char *newpayload
;
1333 ssh
->sccomp
->decompress(ssh
->sc_comp_ctx
,
1334 st
->pktin
->data
+ 5, st
->pktin
->length
- 5,
1335 &newpayload
, &newlen
)) {
1336 if (st
->pktin
->maxlen
< newlen
+ 5) {
1337 st
->pktin
->maxlen
= newlen
+ 5;
1338 st
->pktin
->data
= sresize(st
->pktin
->data
,
1339 st
->pktin
->maxlen
+ APIEXTRA
,
1342 st
->pktin
->length
= 5 + newlen
;
1343 memcpy(st
->pktin
->data
+ 5, newpayload
, newlen
);
1348 st
->pktin
->savedpos
= 6;
1349 st
->pktin
->body
= st
->pktin
->data
;
1350 st
->pktin
->type
= st
->pktin
->data
[5];
1353 * Log incoming packet, possibly omitting sensitive fields.
1357 struct logblank_t blank
;
1358 if (ssh
->cfg
.logomitdata
) {
1359 int do_blank
= FALSE
, blank_prefix
= 0;
1360 /* "Session data" packets - omit the data field */
1361 if (st
->pktin
->type
== SSH2_MSG_CHANNEL_DATA
) {
1362 do_blank
= TRUE
; blank_prefix
= 4;
1363 } else if (st
->pktin
->type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
) {
1364 do_blank
= TRUE
; blank_prefix
= 8;
1367 blank
.offset
= blank_prefix
;
1368 blank
.len
= (st
->pktin
->length
-6) - blank_prefix
;
1369 blank
.type
= PKTLOG_OMIT
;
1373 log_packet(ssh
->logctx
, PKT_INCOMING
, st
->pktin
->type
,
1374 ssh2_pkt_type(ssh
->pkt_ctx
, st
->pktin
->type
),
1375 st
->pktin
->data
+6, st
->pktin
->length
-6,
1379 crFinish(st
->pktin
);
1382 static int s_wrpkt_prepare(Ssh ssh
, struct Packet
*pkt
, int *offset_p
)
1384 int pad
, biglen
, i
, pktoffs
;
1388 * XXX various versions of SC (including 8.8.4) screw up the
1389 * register allocation in this function and use the same register
1390 * (D6) for len and as a temporary, with predictable results. The
1391 * following sledgehammer prevents this.
1398 log_packet(ssh
->logctx
, PKT_OUTGOING
, pkt
->data
[12],
1399 ssh1_pkt_type(pkt
->data
[12]),
1400 pkt
->body
, pkt
->length
- (pkt
->body
- pkt
->data
),
1401 pkt
->nblanks
, pkt
->blanks
);
1402 sfree(pkt
->blanks
); pkt
->blanks
= NULL
;
1405 if (ssh
->v1_compressing
) {
1406 unsigned char *compblk
;
1408 zlib_compress_block(ssh
->cs_comp_ctx
,
1409 pkt
->data
+ 12, pkt
->length
- 12,
1410 &compblk
, &complen
);
1411 memcpy(pkt
->data
+ 12, compblk
, complen
);
1413 pkt
->length
= complen
+ 12;
1416 ssh_pkt_ensure(pkt
, pkt
->length
+ 4); /* space for CRC */
1418 len
= pkt
->length
- 4 - 8; /* len(type+data+CRC) */
1419 pad
= 8 - (len
% 8);
1421 biglen
= len
+ pad
; /* len(padding+type+data+CRC) */
1423 for (i
= pktoffs
; i
< 4+8; i
++)
1424 pkt
->data
[i
] = random_byte();
1425 crc
= crc32_compute(pkt
->data
+ pktoffs
+ 4, biglen
- 4); /* all ex len */
1426 PUT_32BIT(pkt
->data
+ pktoffs
+ 4 + biglen
- 4, crc
);
1427 PUT_32BIT(pkt
->data
+ pktoffs
, len
);
1430 ssh
->cipher
->encrypt(ssh
->v1_cipher_ctx
,
1431 pkt
->data
+ pktoffs
+ 4, biglen
);
1433 if (offset_p
) *offset_p
= pktoffs
;
1434 return biglen
+ 4; /* len(length+padding+type+data+CRC) */
1437 static void s_wrpkt(Ssh ssh
, struct Packet
*pkt
)
1439 int len
, backlog
, offset
;
1440 len
= s_wrpkt_prepare(ssh
, pkt
, &offset
);
1441 backlog
= sk_write(ssh
->s
, (char *)pkt
->data
+ offset
, len
);
1442 if (backlog
> SSH_MAX_BACKLOG
)
1443 ssh_throttle_all(ssh
, 1, backlog
);
1444 ssh_free_packet(pkt
);
1447 static void s_wrpkt_defer(Ssh ssh
, struct Packet
*pkt
)
1450 len
= s_wrpkt_prepare(ssh
, pkt
, &offset
);
1451 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1452 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1453 ssh
->deferred_send_data
= sresize(ssh
->deferred_send_data
,
1457 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
,
1458 pkt
->data
+ offset
, len
);
1459 ssh
->deferred_len
+= len
;
1460 ssh_free_packet(pkt
);
1464 * Construct a SSH-1 packet with the specified contents.
1465 * (This all-at-once interface used to be the only one, but now SSH-1
1466 * packets can also be constructed incrementally.)
1468 static struct Packet
*construct_packet(Ssh ssh
, int pkttype
, va_list ap
)
1474 pkt
= ssh1_pkt_init(pkttype
);
1476 while ((argtype
= va_arg(ap
, int)) != PKT_END
) {
1477 unsigned char *argp
, argchar
;
1478 unsigned long argint
;
1481 /* Actual fields in the packet */
1483 argint
= va_arg(ap
, int);
1484 ssh_pkt_adduint32(pkt
, argint
);
1487 argchar
= (unsigned char) va_arg(ap
, int);
1488 ssh_pkt_addbyte(pkt
, argchar
);
1491 argp
= va_arg(ap
, unsigned char *);
1492 arglen
= va_arg(ap
, int);
1493 ssh_pkt_adddata(pkt
, argp
, arglen
);
1496 argp
= va_arg(ap
, unsigned char *);
1497 ssh_pkt_addstring(pkt
, argp
);
1500 bn
= va_arg(ap
, Bignum
);
1501 ssh1_pkt_addmp(pkt
, bn
);
1503 /* Tokens for modifications to packet logging */
1505 dont_log_password(ssh
, pkt
, PKTLOG_BLANK
);
1508 dont_log_data(ssh
, pkt
, PKTLOG_OMIT
);
1511 end_log_omission(ssh
, pkt
);
1519 static void send_packet(Ssh ssh
, int pkttype
, ...)
1523 va_start(ap
, pkttype
);
1524 pkt
= construct_packet(ssh
, pkttype
, ap
);
1529 static void defer_packet(Ssh ssh
, int pkttype
, ...)
1533 va_start(ap
, pkttype
);
1534 pkt
= construct_packet(ssh
, pkttype
, ap
);
1536 s_wrpkt_defer(ssh
, pkt
);
1539 static int ssh_versioncmp(char *a
, char *b
)
1542 unsigned long av
, bv
;
1544 av
= strtoul(a
, &ae
, 10);
1545 bv
= strtoul(b
, &be
, 10);
1547 return (av
< bv ?
-1 : +1);
1552 av
= strtoul(ae
, &ae
, 10);
1553 bv
= strtoul(be
, &be
, 10);
1555 return (av
< bv ?
-1 : +1);
1560 * Utility routines for putting an SSH-protocol `string' and
1561 * `uint32' into a SHA state.
1563 static void sha_string(SHA_State
* s
, void *str
, int len
)
1565 unsigned char lenblk
[4];
1566 PUT_32BIT(lenblk
, len
);
1567 SHA_Bytes(s
, lenblk
, 4);
1568 SHA_Bytes(s
, str
, len
);
1571 static void sha_uint32(SHA_State
* s
, unsigned i
)
1573 unsigned char intblk
[4];
1574 PUT_32BIT(intblk
, i
);
1575 SHA_Bytes(s
, intblk
, 4);
1579 * Packet construction functions. Mostly shared between SSH-1 and SSH-2.
1581 static void ssh_pkt_ensure(struct Packet
*pkt
, int length
)
1583 if (pkt
->maxlen
< length
) {
1584 unsigned char *body
= pkt
->body
;
1585 int offset
= body ? pkt
->data
- body
: 0;
1586 pkt
->maxlen
= length
+ 256;
1587 pkt
->data
= sresize(pkt
->data
, pkt
->maxlen
+ APIEXTRA
, unsigned char);
1588 if (body
) pkt
->body
= pkt
->data
+ offset
;
1591 static void ssh_pkt_adddata(struct Packet
*pkt
, void *data
, int len
)
1593 if (pkt
->logmode
!= PKTLOG_EMIT
) {
1595 pkt
->blanks
= sresize(pkt
->blanks
, pkt
->nblanks
, struct logblank_t
);
1597 pkt
->blanks
[pkt
->nblanks
-1].offset
= pkt
->length
-
1598 (pkt
->body
- pkt
->data
);
1599 pkt
->blanks
[pkt
->nblanks
-1].len
= len
;
1600 pkt
->blanks
[pkt
->nblanks
-1].type
= pkt
->logmode
;
1603 ssh_pkt_ensure(pkt
, pkt
->length
);
1604 memcpy(pkt
->data
+ pkt
->length
- len
, data
, len
);
1606 static void ssh_pkt_addbyte(struct Packet
*pkt
, unsigned char byte
)
1608 ssh_pkt_adddata(pkt
, &byte
, 1);
1610 static void ssh2_pkt_addbool(struct Packet
*pkt
, unsigned char value
)
1612 ssh_pkt_adddata(pkt
, &value
, 1);
1614 static void ssh_pkt_adduint32(struct Packet
*pkt
, unsigned long value
)
1617 PUT_32BIT(x
, value
);
1618 ssh_pkt_adddata(pkt
, x
, 4);
1620 static void ssh_pkt_addstring_start(struct Packet
*pkt
)
1622 ssh_pkt_adduint32(pkt
, 0);
1623 pkt
->savedpos
= pkt
->length
;
1625 static void ssh_pkt_addstring_str(struct Packet
*pkt
, char *data
)
1627 ssh_pkt_adddata(pkt
, data
, strlen(data
));
1628 PUT_32BIT(pkt
->data
+ pkt
->savedpos
- 4, pkt
->length
- pkt
->savedpos
);
1630 static void ssh_pkt_addstring_data(struct Packet
*pkt
, char *data
, int len
)
1632 ssh_pkt_adddata(pkt
, data
, len
);
1633 PUT_32BIT(pkt
->data
+ pkt
->savedpos
- 4, pkt
->length
- pkt
->savedpos
);
1635 static void ssh_pkt_addstring(struct Packet
*pkt
, char *data
)
1637 ssh_pkt_addstring_start(pkt
);
1638 ssh_pkt_addstring_str(pkt
, data
);
1640 static void ssh1_pkt_addmp(struct Packet
*pkt
, Bignum b
)
1642 int len
= ssh1_bignum_length(b
);
1643 unsigned char *data
= snewn(len
, char);
1644 (void) ssh1_write_bignum(data
, b
);
1645 ssh_pkt_adddata(pkt
, data
, len
);
1648 static unsigned char *ssh2_mpint_fmt(Bignum b
, int *len
)
1651 int i
, n
= (bignum_bitcount(b
) + 7) / 8;
1652 p
= snewn(n
+ 1, unsigned char);
1654 fatalbox("out of memory");
1656 for (i
= 1; i
<= n
; i
++)
1657 p
[i
] = bignum_byte(b
, n
- i
);
1659 while (i
<= n
&& p
[i
] == 0 && (p
[i
+ 1] & 0x80) == 0)
1661 memmove(p
, p
+ i
, n
+ 1 - i
);
1665 static void ssh2_pkt_addmp(struct Packet
*pkt
, Bignum b
)
1669 p
= ssh2_mpint_fmt(b
, &len
);
1670 ssh_pkt_addstring_start(pkt
);
1671 ssh_pkt_addstring_data(pkt
, (char *)p
, len
);
1675 static struct Packet
*ssh1_pkt_init(int pkt_type
)
1677 struct Packet
*pkt
= ssh_new_packet();
1678 pkt
->length
= 4 + 8; /* space for length + max padding */
1679 ssh_pkt_addbyte(pkt
, pkt_type
);
1680 pkt
->body
= pkt
->data
+ pkt
->length
;
1684 /* For legacy code (SSH-1 and -2 packet construction used to be separate) */
1685 #define ssh2_pkt_ensure(pkt, length) ssh_pkt_ensure(pkt, length)
1686 #define ssh2_pkt_adddata(pkt, data, len) ssh_pkt_adddata(pkt, data, len)
1687 #define ssh2_pkt_addbyte(pkt, byte) ssh_pkt_addbyte(pkt, byte)
1688 #define ssh2_pkt_adduint32(pkt, value) ssh_pkt_adduint32(pkt, value)
1689 #define ssh2_pkt_addstring_start(pkt) ssh_pkt_addstring_start(pkt)
1690 #define ssh2_pkt_addstring_str(pkt, data) ssh_pkt_addstring_str(pkt, data)
1691 #define ssh2_pkt_addstring_data(pkt, data, len) ssh_pkt_addstring_data(pkt, data, len)
1692 #define ssh2_pkt_addstring(pkt, data) ssh_pkt_addstring(pkt, data)
1694 static struct Packet
*ssh2_pkt_init(int pkt_type
)
1696 struct Packet
*pkt
= ssh_new_packet();
1699 ssh_pkt_addbyte(pkt
, (unsigned char) pkt_type
);
1700 pkt
->body
= pkt
->data
+ pkt
->length
;
1705 * Construct an SSH-2 final-form packet: compress it, encrypt it,
1706 * put the MAC on it. Final packet, ready to be sent, is stored in
1707 * pkt->data. Total length is returned.
1709 static int ssh2_pkt_construct(Ssh ssh
, struct Packet
*pkt
)
1711 int cipherblk
, maclen
, padding
, i
;
1714 log_packet(ssh
->logctx
, PKT_OUTGOING
, pkt
->data
[5],
1715 ssh2_pkt_type(ssh
->pkt_ctx
, pkt
->data
[5]),
1716 pkt
->body
, pkt
->length
- (pkt
->body
- pkt
->data
),
1717 pkt
->nblanks
, pkt
->blanks
);
1718 sfree(pkt
->blanks
); pkt
->blanks
= NULL
;
1722 * Compress packet payload.
1725 unsigned char *newpayload
;
1728 ssh
->cscomp
->compress(ssh
->cs_comp_ctx
, pkt
->data
+ 5,
1730 &newpayload
, &newlen
)) {
1732 ssh2_pkt_adddata(pkt
, newpayload
, newlen
);
1738 * Add padding. At least four bytes, and must also bring total
1739 * length (minus MAC) up to a multiple of the block size.
1740 * If pkt->forcepad is set, make sure the packet is at least that size
1743 cipherblk
= ssh
->cscipher ? ssh
->cscipher
->blksize
: 8; /* block size */
1744 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
1746 if (pkt
->length
+ padding
< pkt
->forcepad
)
1747 padding
= pkt
->forcepad
- pkt
->length
;
1749 (cipherblk
- (pkt
->length
+ padding
) % cipherblk
) % cipherblk
;
1750 assert(padding
<= 255);
1751 maclen
= ssh
->csmac ? ssh
->csmac
->len
: 0;
1752 ssh2_pkt_ensure(pkt
, pkt
->length
+ padding
+ maclen
);
1753 pkt
->data
[4] = padding
;
1754 for (i
= 0; i
< padding
; i
++)
1755 pkt
->data
[pkt
->length
+ i
] = random_byte();
1756 PUT_32BIT(pkt
->data
, pkt
->length
+ padding
- 4);
1758 ssh
->csmac
->generate(ssh
->cs_mac_ctx
, pkt
->data
,
1759 pkt
->length
+ padding
,
1760 ssh
->v2_outgoing_sequence
);
1761 ssh
->v2_outgoing_sequence
++; /* whether or not we MACed */
1764 ssh
->cscipher
->encrypt(ssh
->cs_cipher_ctx
,
1765 pkt
->data
, pkt
->length
+ padding
);
1767 pkt
->encrypted_len
= pkt
->length
+ padding
;
1769 /* Ready-to-send packet starts at pkt->data. We return length. */
1770 return pkt
->length
+ padding
+ maclen
;
1774 * Routines called from the main SSH code to send packets. There
1775 * are quite a few of these, because we have two separate
1776 * mechanisms for delaying the sending of packets:
1778 * - In order to send an IGNORE message and a password message in
1779 * a single fixed-length blob, we require the ability to
1780 * concatenate the encrypted forms of those two packets _into_ a
1781 * single blob and then pass it to our <network.h> transport
1782 * layer in one go. Hence, there's a deferment mechanism which
1783 * works after packet encryption.
1785 * - In order to avoid sending any connection-layer messages
1786 * during repeat key exchange, we have to queue up any such
1787 * outgoing messages _before_ they are encrypted (and in
1788 * particular before they're allocated sequence numbers), and
1789 * then send them once we've finished.
1791 * I call these mechanisms `defer' and `queue' respectively, so as
1792 * to distinguish them reasonably easily.
1794 * The functions send_noqueue() and defer_noqueue() free the packet
1795 * structure they are passed. Every outgoing packet goes through
1796 * precisely one of these functions in its life; packets passed to
1797 * ssh2_pkt_send() or ssh2_pkt_defer() either go straight to one of
1798 * these or get queued, and then when the queue is later emptied
1799 * the packets are all passed to defer_noqueue().
1801 * When using a CBC-mode cipher, it's necessary to ensure that an
1802 * attacker can't provide data to be encrypted using an IV that they
1803 * know. We ensure this by prefixing each packet that might contain
1804 * user data with an SSH_MSG_IGNORE. This is done using the deferral
1805 * mechanism, so in this case send_noqueue() ends up redirecting to
1806 * defer_noqueue(). If you don't like this inefficiency, don't use
1810 static void ssh2_pkt_defer_noqueue(Ssh
, struct Packet
*, int);
1811 static void ssh_pkt_defersend(Ssh
);
1814 * Send an SSH-2 packet immediately, without queuing or deferring.
1816 static void ssh2_pkt_send_noqueue(Ssh ssh
, struct Packet
*pkt
)
1820 if (ssh
->cscipher
!= NULL
&& (ssh
->cscipher
->flags
& SSH_CIPHER_IS_CBC
)) {
1821 /* We need to send two packets, so use the deferral mechanism. */
1822 ssh2_pkt_defer_noqueue(ssh
, pkt
, FALSE
);
1823 ssh_pkt_defersend(ssh
);
1826 len
= ssh2_pkt_construct(ssh
, pkt
);
1827 backlog
= sk_write(ssh
->s
, (char *)pkt
->data
, len
);
1828 if (backlog
> SSH_MAX_BACKLOG
)
1829 ssh_throttle_all(ssh
, 1, backlog
);
1831 ssh
->outgoing_data_size
+= pkt
->encrypted_len
;
1832 if (!ssh
->kex_in_progress
&&
1833 ssh
->max_data_size
!= 0 &&
1834 ssh
->outgoing_data_size
> ssh
->max_data_size
)
1835 do_ssh2_transport(ssh
, "too much data sent", -1, NULL
);
1837 ssh_free_packet(pkt
);
1841 * Defer an SSH-2 packet.
1843 static void ssh2_pkt_defer_noqueue(Ssh ssh
, struct Packet
*pkt
, int noignore
)
1846 if (ssh
->cscipher
!= NULL
&& (ssh
->cscipher
->flags
& SSH_CIPHER_IS_CBC
) &&
1847 ssh
->deferred_len
== 0 && !noignore
) {
1849 * Interpose an SSH_MSG_IGNORE to ensure that user data don't
1850 * get encrypted with a known IV.
1852 struct Packet
*ipkt
= ssh2_pkt_init(SSH2_MSG_IGNORE
);
1853 ssh2_pkt_defer_noqueue(ssh
, ipkt
, TRUE
);
1855 len
= ssh2_pkt_construct(ssh
, pkt
);
1856 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1857 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1858 ssh
->deferred_send_data
= sresize(ssh
->deferred_send_data
,
1862 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, pkt
->data
, len
);
1863 ssh
->deferred_len
+= len
;
1864 ssh
->deferred_data_size
+= pkt
->encrypted_len
;
1865 ssh_free_packet(pkt
);
1869 * Queue an SSH-2 packet.
1871 static void ssh2_pkt_queue(Ssh ssh
, struct Packet
*pkt
)
1873 assert(ssh
->queueing
);
1875 if (ssh
->queuelen
>= ssh
->queuesize
) {
1876 ssh
->queuesize
= ssh
->queuelen
+ 32;
1877 ssh
->queue
= sresize(ssh
->queue
, ssh
->queuesize
, struct Packet
*);
1880 ssh
->queue
[ssh
->queuelen
++] = pkt
;
1884 * Either queue or send a packet, depending on whether queueing is
1887 static void ssh2_pkt_send(Ssh ssh
, struct Packet
*pkt
)
1890 ssh2_pkt_queue(ssh
, pkt
);
1892 ssh2_pkt_send_noqueue(ssh
, pkt
);
1897 * Either queue or defer a packet, depending on whether queueing is
1900 static void ssh2_pkt_defer(Ssh ssh
, struct Packet
*pkt
)
1903 ssh2_pkt_queue(ssh
, pkt
);
1905 ssh2_pkt_defer_noqueue(ssh
, pkt
, FALSE
);
1910 * Send the whole deferred data block constructed by
1911 * ssh2_pkt_defer() or SSH-1's defer_packet().
1913 * The expected use of the defer mechanism is that you call
1914 * ssh2_pkt_defer() a few times, then call ssh_pkt_defersend(). If
1915 * not currently queueing, this simply sets up deferred_send_data
1916 * and then sends it. If we _are_ currently queueing, the calls to
1917 * ssh2_pkt_defer() put the deferred packets on to the queue
1918 * instead, and therefore ssh_pkt_defersend() has no deferred data
1919 * to send. Hence, there's no need to make it conditional on
1922 static void ssh_pkt_defersend(Ssh ssh
)
1925 backlog
= sk_write(ssh
->s
, (char *)ssh
->deferred_send_data
,
1927 ssh
->deferred_len
= ssh
->deferred_size
= 0;
1928 sfree(ssh
->deferred_send_data
);
1929 ssh
->deferred_send_data
= NULL
;
1930 if (backlog
> SSH_MAX_BACKLOG
)
1931 ssh_throttle_all(ssh
, 1, backlog
);
1933 ssh
->outgoing_data_size
+= ssh
->deferred_data_size
;
1934 if (!ssh
->kex_in_progress
&&
1935 ssh
->max_data_size
!= 0 &&
1936 ssh
->outgoing_data_size
> ssh
->max_data_size
)
1937 do_ssh2_transport(ssh
, "too much data sent", -1, NULL
);
1938 ssh
->deferred_data_size
= 0;
1942 * Send all queued SSH-2 packets. We send them by means of
1943 * ssh2_pkt_defer_noqueue(), in case they included a pair of
1944 * packets that needed to be lumped together.
1946 static void ssh2_pkt_queuesend(Ssh ssh
)
1950 assert(!ssh
->queueing
);
1952 for (i
= 0; i
< ssh
->queuelen
; i
++)
1953 ssh2_pkt_defer_noqueue(ssh
, ssh
->queue
[i
], FALSE
);
1956 ssh_pkt_defersend(ssh
);
1960 void bndebug(char *string
, Bignum b
)
1964 p
= ssh2_mpint_fmt(b
, &len
);
1965 debug(("%s", string
));
1966 for (i
= 0; i
< len
; i
++)
1967 debug((" %02x", p
[i
]));
1973 static void sha_mpint(SHA_State
* s
, Bignum b
)
1977 p
= ssh2_mpint_fmt(b
, &len
);
1978 sha_string(s
, p
, len
);
1983 * Packet decode functions for both SSH-1 and SSH-2.
1985 static unsigned long ssh_pkt_getuint32(struct Packet
*pkt
)
1987 unsigned long value
;
1988 if (pkt
->length
- pkt
->savedpos
< 4)
1989 return 0; /* arrgh, no way to decline (FIXME?) */
1990 value
= GET_32BIT(pkt
->body
+ pkt
->savedpos
);
1994 static int ssh2_pkt_getbool(struct Packet
*pkt
)
1996 unsigned long value
;
1997 if (pkt
->length
- pkt
->savedpos
< 1)
1998 return 0; /* arrgh, no way to decline (FIXME?) */
1999 value
= pkt
->body
[pkt
->savedpos
] != 0;
2003 static void ssh_pkt_getstring(struct Packet
*pkt
, char **p
, int *length
)
2008 if (pkt
->length
- pkt
->savedpos
< 4)
2010 len
= GET_32BIT(pkt
->body
+ pkt
->savedpos
);
2015 if (pkt
->length
- pkt
->savedpos
< *length
)
2017 *p
= (char *)(pkt
->body
+ pkt
->savedpos
);
2018 pkt
->savedpos
+= *length
;
2020 static void *ssh_pkt_getdata(struct Packet
*pkt
, int length
)
2022 if (pkt
->length
- pkt
->savedpos
< length
)
2024 pkt
->savedpos
+= length
;
2025 return pkt
->body
+ (pkt
->savedpos
- length
);
2027 static int ssh1_pkt_getrsakey(struct Packet
*pkt
, struct RSAKey
*key
,
2028 unsigned char **keystr
)
2032 j
= makekey(pkt
->body
+ pkt
->savedpos
,
2033 pkt
->length
- pkt
->savedpos
,
2040 assert(pkt
->savedpos
< pkt
->length
);
2044 static Bignum
ssh1_pkt_getmp(struct Packet
*pkt
)
2049 j
= ssh1_read_bignum(pkt
->body
+ pkt
->savedpos
,
2050 pkt
->length
- pkt
->savedpos
, &b
);
2058 static Bignum
ssh2_pkt_getmp(struct Packet
*pkt
)
2064 ssh_pkt_getstring(pkt
, &p
, &length
);
2069 b
= bignum_from_bytes((unsigned char *)p
, length
);
2074 * Helper function to add an SSH-2 signature blob to a packet.
2075 * Expects to be shown the public key blob as well as the signature
2076 * blob. Normally works just like ssh2_pkt_addstring, but will
2077 * fiddle with the signature packet if necessary for
2078 * BUG_SSH2_RSA_PADDING.
2080 static void ssh2_add_sigblob(Ssh ssh
, struct Packet
*pkt
,
2081 void *pkblob_v
, int pkblob_len
,
2082 void *sigblob_v
, int sigblob_len
)
2084 unsigned char *pkblob
= (unsigned char *)pkblob_v
;
2085 unsigned char *sigblob
= (unsigned char *)sigblob_v
;
2087 /* dmemdump(pkblob, pkblob_len); */
2088 /* dmemdump(sigblob, sigblob_len); */
2091 * See if this is in fact an ssh-rsa signature and a buggy
2092 * server; otherwise we can just do this the easy way.
2094 if ((ssh
->remote_bugs
& BUG_SSH2_RSA_PADDING
) &&
2095 (GET_32BIT(pkblob
) == 7 && !memcmp(pkblob
+4, "ssh-rsa", 7))) {
2096 int pos
, len
, siglen
;
2099 * Find the byte length of the modulus.
2102 pos
= 4+7; /* skip over "ssh-rsa" */
2103 pos
+= 4 + GET_32BIT(pkblob
+pos
); /* skip over exponent */
2104 len
= GET_32BIT(pkblob
+pos
); /* find length of modulus */
2105 pos
+= 4; /* find modulus itself */
2106 while (len
> 0 && pkblob
[pos
] == 0)
2108 /* debug(("modulus length is %d\n", len)); */
2111 * Now find the signature integer.
2113 pos
= 4+7; /* skip over "ssh-rsa" */
2114 siglen
= GET_32BIT(sigblob
+pos
);
2115 /* debug(("signature length is %d\n", siglen)); */
2117 if (len
!= siglen
) {
2118 unsigned char newlen
[4];
2119 ssh2_pkt_addstring_start(pkt
);
2120 ssh2_pkt_addstring_data(pkt
, (char *)sigblob
, pos
);
2121 /* dmemdump(sigblob, pos); */
2122 pos
+= 4; /* point to start of actual sig */
2123 PUT_32BIT(newlen
, len
);
2124 ssh2_pkt_addstring_data(pkt
, (char *)newlen
, 4);
2125 /* dmemdump(newlen, 4); */
2127 while (len
-- > siglen
) {
2128 ssh2_pkt_addstring_data(pkt
, (char *)newlen
, 1);
2129 /* dmemdump(newlen, 1); */
2131 ssh2_pkt_addstring_data(pkt
, (char *)(sigblob
+pos
), siglen
);
2132 /* dmemdump(sigblob+pos, siglen); */
2136 /* Otherwise fall through and do it the easy way. */
2139 ssh2_pkt_addstring_start(pkt
);
2140 ssh2_pkt_addstring_data(pkt
, (char *)sigblob
, sigblob_len
);
2144 * Examine the remote side's version string and compare it against
2145 * a list of known buggy implementations.
2147 static void ssh_detect_bugs(Ssh ssh
, char *vstring
)
2149 char *imp
; /* pointer to implementation part */
2151 imp
+= strcspn(imp
, "-");
2153 imp
+= strcspn(imp
, "-");
2156 ssh
->remote_bugs
= 0;
2158 if (ssh
->cfg
.sshbug_ignore1
== FORCE_ON
||
2159 (ssh
->cfg
.sshbug_ignore1
== AUTO
&&
2160 (!strcmp(imp
, "1.2.18") || !strcmp(imp
, "1.2.19") ||
2161 !strcmp(imp
, "1.2.20") || !strcmp(imp
, "1.2.21") ||
2162 !strcmp(imp
, "1.2.22") || !strcmp(imp
, "Cisco-1.25") ||
2163 !strcmp(imp
, "OSU_1.4alpha3") || !strcmp(imp
, "OSU_1.5alpha4")))) {
2165 * These versions don't support SSH1_MSG_IGNORE, so we have
2166 * to use a different defence against password length
2169 ssh
->remote_bugs
|= BUG_CHOKES_ON_SSH1_IGNORE
;
2170 logevent("We believe remote version has SSH-1 ignore bug");
2173 if (ssh
->cfg
.sshbug_plainpw1
== FORCE_ON
||
2174 (ssh
->cfg
.sshbug_plainpw1
== AUTO
&&
2175 (!strcmp(imp
, "Cisco-1.25") || !strcmp(imp
, "OSU_1.4alpha3")))) {
2177 * These versions need a plain password sent; they can't
2178 * handle having a null and a random length of data after
2181 ssh
->remote_bugs
|= BUG_NEEDS_SSH1_PLAIN_PASSWORD
;
2182 logevent("We believe remote version needs a plain SSH-1 password");
2185 if (ssh
->cfg
.sshbug_rsa1
== FORCE_ON
||
2186 (ssh
->cfg
.sshbug_rsa1
== AUTO
&&
2187 (!strcmp(imp
, "Cisco-1.25")))) {
2189 * These versions apparently have no clue whatever about
2190 * RSA authentication and will panic and die if they see
2191 * an AUTH_RSA message.
2193 ssh
->remote_bugs
|= BUG_CHOKES_ON_RSA
;
2194 logevent("We believe remote version can't handle SSH-1 RSA authentication");
2197 if (ssh
->cfg
.sshbug_hmac2
== FORCE_ON
||
2198 (ssh
->cfg
.sshbug_hmac2
== AUTO
&&
2199 !wc_match("* VShell", imp
) &&
2200 (wc_match("2.1.0*", imp
) || wc_match("2.0.*", imp
) ||
2201 wc_match("2.2.0*", imp
) || wc_match("2.3.0*", imp
) ||
2202 wc_match("2.1 *", imp
)))) {
2204 * These versions have the HMAC bug.
2206 ssh
->remote_bugs
|= BUG_SSH2_HMAC
;
2207 logevent("We believe remote version has SSH-2 HMAC bug");
2210 if (ssh
->cfg
.sshbug_derivekey2
== FORCE_ON
||
2211 (ssh
->cfg
.sshbug_derivekey2
== AUTO
&&
2212 !wc_match("* VShell", imp
) &&
2213 (wc_match("2.0.0*", imp
) || wc_match("2.0.10*", imp
) ))) {
2215 * These versions have the key-derivation bug (failing to
2216 * include the literal shared secret in the hashes that
2217 * generate the keys).
2219 ssh
->remote_bugs
|= BUG_SSH2_DERIVEKEY
;
2220 logevent("We believe remote version has SSH-2 key-derivation bug");
2223 if (ssh
->cfg
.sshbug_rsapad2
== FORCE_ON
||
2224 (ssh
->cfg
.sshbug_rsapad2
== AUTO
&&
2225 (wc_match("OpenSSH_2.[5-9]*", imp
) ||
2226 wc_match("OpenSSH_3.[0-2]*", imp
)))) {
2228 * These versions have the SSH-2 RSA padding bug.
2230 ssh
->remote_bugs
|= BUG_SSH2_RSA_PADDING
;
2231 logevent("We believe remote version has SSH-2 RSA padding bug");
2234 if (ssh
->cfg
.sshbug_pksessid2
== FORCE_ON
||
2235 (ssh
->cfg
.sshbug_pksessid2
== AUTO
&&
2236 wc_match("OpenSSH_2.[0-2]*", imp
))) {
2238 * These versions have the SSH-2 session-ID bug in
2239 * public-key authentication.
2241 ssh
->remote_bugs
|= BUG_SSH2_PK_SESSIONID
;
2242 logevent("We believe remote version has SSH-2 public-key-session-ID bug");
2245 if (ssh
->cfg
.sshbug_rekey2
== FORCE_ON
||
2246 (ssh
->cfg
.sshbug_rekey2
== AUTO
&&
2247 (wc_match("OpenSSH_2.[0-4]*", imp
) ||
2248 wc_match("OpenSSH_2.5.[0-3]*", imp
) ||
2249 wc_match("Sun_SSH_1.0", imp
) ||
2250 wc_match("Sun_SSH_1.0.1", imp
)))) {
2252 * These versions have the SSH-2 rekey bug.
2254 ssh
->remote_bugs
|= BUG_SSH2_REKEY
;
2255 logevent("We believe remote version has SSH-2 rekey bug");
2260 * The `software version' part of an SSH version string is required
2261 * to contain no spaces or minus signs.
2263 static void ssh_fix_verstring(char *str
)
2265 /* Eat "SSH-<protoversion>-". */
2266 assert(*str
== 'S'); str
++;
2267 assert(*str
== 'S'); str
++;
2268 assert(*str
== 'H'); str
++;
2269 assert(*str
== '-'); str
++;
2270 while (*str
&& *str
!= '-') str
++;
2271 assert(*str
== '-'); str
++;
2273 /* Convert minus signs and spaces in the remaining string into
2276 if (*str
== '-' || *str
== ' ')
2282 static int do_ssh_init(Ssh ssh
, unsigned char c
)
2284 struct do_ssh_init_state
{
2292 crState(do_ssh_init_state
);
2294 crBegin(ssh
->do_ssh_init_crstate
);
2296 /* Search for the string "SSH-" in the input. */
2299 static const int transS
[] = { 1, 2, 2, 1 };
2300 static const int transH
[] = { 0, 0, 3, 0 };
2301 static const int transminus
[] = { 0, 0, 0, -1 };
2303 s
->i
= transS
[s
->i
];
2305 s
->i
= transH
[s
->i
];
2307 s
->i
= transminus
[s
->i
];
2312 crReturn(1); /* get another character */
2316 s
->vstring
= snewn(s
->vstrsize
, char);
2317 strcpy(s
->vstring
, "SSH-");
2321 crReturn(1); /* get another char */
2322 if (s
->vslen
>= s
->vstrsize
- 1) {
2324 s
->vstring
= sresize(s
->vstring
, s
->vstrsize
, char);
2326 s
->vstring
[s
->vslen
++] = c
;
2329 s
->version
[s
->i
] = '\0';
2331 } else if (s
->i
< sizeof(s
->version
) - 1)
2332 s
->version
[s
->i
++] = c
;
2333 } else if (c
== '\012')
2337 ssh
->agentfwd_enabled
= FALSE
;
2338 ssh
->rdpkt2_state
.incoming_sequence
= 0;
2340 s
->vstring
[s
->vslen
] = 0;
2341 s
->vstring
[strcspn(s
->vstring
, "\015\012")] = '\0';/* remove EOL chars */
2342 logeventf(ssh
, "Server version: %s", s
->vstring
);
2343 ssh_detect_bugs(ssh
, s
->vstring
);
2346 * Decide which SSH protocol version to support.
2349 /* Anything strictly below "2.0" means protocol 1 is supported. */
2350 s
->proto1
= ssh_versioncmp(s
->version
, "2.0") < 0;
2351 /* Anything greater or equal to "1.99" means protocol 2 is supported. */
2352 s
->proto2
= ssh_versioncmp(s
->version
, "1.99") >= 0;
2354 if (ssh
->cfg
.sshprot
== 0 && !s
->proto1
) {
2355 bombout(("SSH protocol version 1 required by user but not provided by server"));
2358 if (ssh
->cfg
.sshprot
== 3 && !s
->proto2
) {
2359 bombout(("SSH protocol version 2 required by user but not provided by server"));
2366 if (s
->proto2
&& (ssh
->cfg
.sshprot
>= 2 || !s
->proto1
)) {
2368 * Construct a v2 version string.
2370 verstring
= dupprintf("SSH-2.0-%s\015\012", sshver
);
2374 * Construct a v1 version string.
2376 verstring
= dupprintf("SSH-%s-%s\012",
2377 (ssh_versioncmp(s
->version
, "1.5") <= 0 ?
2378 s
->version
: "1.5"),
2383 ssh_fix_verstring(verstring
);
2385 if (ssh
->version
== 2) {
2387 * Hash our version string and their version string.
2389 SHA_Init(&ssh
->exhashbase
);
2390 sha_string(&ssh
->exhashbase
, verstring
,
2391 strcspn(verstring
, "\015\012"));
2392 sha_string(&ssh
->exhashbase
, s
->vstring
,
2393 strcspn(s
->vstring
, "\015\012"));
2396 * Initialise SSH-2 protocol.
2398 ssh
->protocol
= ssh2_protocol
;
2399 ssh2_protocol_setup(ssh
);
2400 ssh
->s_rdpkt
= ssh2_rdpkt
;
2403 * Initialise SSH-1 protocol.
2405 ssh
->protocol
= ssh1_protocol
;
2406 ssh1_protocol_setup(ssh
);
2407 ssh
->s_rdpkt
= ssh1_rdpkt
;
2409 logeventf(ssh
, "We claim version: %.*s",
2410 strcspn(verstring
, "\015\012"), verstring
);
2411 sk_write(ssh
->s
, verstring
, strlen(verstring
));
2413 if (ssh
->version
== 2)
2414 do_ssh2_transport(ssh
, NULL
, -1, NULL
);
2417 logeventf(ssh
, "Using SSH protocol version %d", ssh
->version
);
2419 update_specials_menu(ssh
->frontend
);
2420 ssh
->state
= SSH_STATE_BEFORE_SIZE
;
2421 ssh
->pinger
= pinger_new(&ssh
->cfg
, &ssh_backend
, ssh
);
2428 static void ssh_process_incoming_data(Ssh ssh
,
2429 unsigned char **data
, int *datalen
)
2431 struct Packet
*pktin
= ssh
->s_rdpkt(ssh
, data
, datalen
);
2433 ssh
->protocol(ssh
, NULL
, 0, pktin
);
2434 ssh_free_packet(pktin
);
2438 static void ssh_queue_incoming_data(Ssh ssh
,
2439 unsigned char **data
, int *datalen
)
2441 bufchain_add(&ssh
->queued_incoming_data
, *data
, *datalen
);
2446 static void ssh_process_queued_incoming_data(Ssh ssh
)
2449 unsigned char *data
;
2452 while (!ssh
->frozen
&& bufchain_size(&ssh
->queued_incoming_data
)) {
2453 bufchain_prefix(&ssh
->queued_incoming_data
, &vdata
, &len
);
2457 while (!ssh
->frozen
&& len
> 0)
2458 ssh_process_incoming_data(ssh
, &data
, &len
);
2461 bufchain_consume(&ssh
->queued_incoming_data
, origlen
- len
);
2465 static void ssh_set_frozen(Ssh ssh
, int frozen
)
2468 sk_set_frozen(ssh
->s
, frozen
);
2469 ssh
->frozen
= frozen
;
2472 static void ssh_gotdata(Ssh ssh
, unsigned char *data
, int datalen
)
2474 crBegin(ssh
->ssh_gotdata_crstate
);
2477 * To begin with, feed the characters one by one to the
2478 * protocol initialisation / selection function do_ssh_init().
2479 * When that returns 0, we're done with the initial greeting
2480 * exchange and can move on to packet discipline.
2483 int ret
; /* need not be kept across crReturn */
2485 crReturnV
; /* more data please */
2486 ret
= do_ssh_init(ssh
, *data
);
2494 * We emerge from that loop when the initial negotiation is
2495 * over and we have selected an s_rdpkt function. Now pass
2496 * everything to s_rdpkt, and then pass the resulting packets
2497 * to the proper protocol handler.
2503 * Process queued data if there is any.
2505 ssh_process_queued_incoming_data(ssh
);
2508 while (datalen
> 0) {
2510 ssh_queue_incoming_data(ssh
, &data
, &datalen
);
2512 ssh_process_incoming_data(ssh
, &data
, &datalen
);
2514 if (ssh
->state
== SSH_STATE_CLOSED
)
2522 static int ssh_do_close(Ssh ssh
, int notify_exit
)
2525 struct ssh_channel
*c
;
2527 ssh
->state
= SSH_STATE_CLOSED
;
2528 expire_timer_context(ssh
);
2533 notify_remote_exit(ssh
->frontend
);
2538 * Now we must shut down any port- and X-forwarded channels going
2539 * through this connection.
2541 if (ssh
->channels
) {
2542 while (NULL
!= (c
= index234(ssh
->channels
, 0))) {
2545 x11_close(c
->u
.x11
.s
);
2548 pfd_close(c
->u
.pfd
.s
);
2551 del234(ssh
->channels
, c
); /* moving next one to index 0 */
2552 if (ssh
->version
== 2)
2553 bufchain_clear(&c
->v
.v2
.outbuffer
);
2558 * Go through port-forwardings, and close any associated
2559 * listening sockets.
2561 if (ssh
->portfwds
) {
2562 struct ssh_portfwd
*pf
;
2563 while (NULL
!= (pf
= index234(ssh
->portfwds
, 0))) {
2564 /* Dispose of any listening socket. */
2566 pfd_terminate(pf
->local
);
2567 del234(ssh
->portfwds
, pf
); /* moving next one to index 0 */
2575 static void ssh_log(Plug plug
, int type
, SockAddr addr
, int port
,
2576 const char *error_msg
, int error_code
)
2578 Ssh ssh
= (Ssh
) plug
;
2579 char addrbuf
[256], *msg
;
2581 sk_getaddr(addr
, addrbuf
, lenof(addrbuf
));
2584 msg
= dupprintf("Connecting to %s port %d", addrbuf
, port
);
2586 msg
= dupprintf("Failed to connect to %s: %s", addrbuf
, error_msg
);
2592 static int ssh_closing(Plug plug
, const char *error_msg
, int error_code
,
2595 Ssh ssh
= (Ssh
) plug
;
2596 int need_notify
= ssh_do_close(ssh
, FALSE
);
2598 if (!error_msg
&& !ssh
->close_expected
) {
2599 error_msg
= "Server unexpectedly closed network connection";
2603 notify_remote_exit(ssh
->frontend
);
2606 /* A socket error has occurred. */
2607 logevent(error_msg
);
2608 connection_fatal(ssh
->frontend
, "%s", error_msg
);
2610 logevent("Server closed network connection");
2615 static int ssh_receive(Plug plug
, int urgent
, char *data
, int len
)
2617 Ssh ssh
= (Ssh
) plug
;
2618 ssh_gotdata(ssh
, (unsigned char *)data
, len
);
2619 if (ssh
->state
== SSH_STATE_CLOSED
) {
2620 ssh_do_close(ssh
, TRUE
);
2626 static void ssh_sent(Plug plug
, int bufsize
)
2628 Ssh ssh
= (Ssh
) plug
;
2630 * If the send backlog on the SSH socket itself clears, we
2631 * should unthrottle the whole world if it was throttled.
2633 if (bufsize
< SSH_MAX_BACKLOG
)
2634 ssh_throttle_all(ssh
, 0, bufsize
);
2638 * Connect to specified host and port.
2639 * Returns an error message, or NULL on success.
2640 * Also places the canonical host name into `realhost'. It must be
2641 * freed by the caller.
2643 static const char *connect_to_host(Ssh ssh
, char *host
, int port
,
2644 char **realhost
, int nodelay
, int keepalive
)
2646 static const struct plug_function_table fn_table
= {
2657 ssh
->savedhost
= snewn(1 + strlen(host
), char);
2658 if (!ssh
->savedhost
)
2659 fatalbox("Out of memory");
2660 strcpy(ssh
->savedhost
, host
);
2663 port
= 22; /* default ssh port */
2664 ssh
->savedport
= port
;
2669 logeventf(ssh
, "Looking up host \"%s\"%s", host
,
2670 (ssh
->cfg
.addressfamily
== ADDRTYPE_IPV4 ?
" (IPv4)" :
2671 (ssh
->cfg
.addressfamily
== ADDRTYPE_IPV6 ?
" (IPv6)" : "")));
2672 addr
= name_lookup(host
, port
, realhost
, &ssh
->cfg
,
2673 ssh
->cfg
.addressfamily
);
2674 if ((err
= sk_addr_error(addr
)) != NULL
) {
2682 ssh
->fn
= &fn_table
;
2683 ssh
->s
= new_connection(addr
, *realhost
, port
,
2684 0, 1, nodelay
, keepalive
, (Plug
) ssh
, &ssh
->cfg
);
2685 if ((err
= sk_socket_error(ssh
->s
)) != NULL
) {
2687 notify_remote_exit(ssh
->frontend
);
2695 * Throttle or unthrottle the SSH connection.
2697 static void ssh1_throttle(Ssh ssh
, int adjust
)
2699 int old_count
= ssh
->v1_throttle_count
;
2700 ssh
->v1_throttle_count
+= adjust
;
2701 assert(ssh
->v1_throttle_count
>= 0);
2702 if (ssh
->v1_throttle_count
&& !old_count
) {
2703 ssh_set_frozen(ssh
, 1);
2704 } else if (!ssh
->v1_throttle_count
&& old_count
) {
2705 ssh_set_frozen(ssh
, 0);
2710 * Throttle or unthrottle _all_ local data streams (for when sends
2711 * on the SSH connection itself back up).
2713 static void ssh_throttle_all(Ssh ssh
, int enable
, int bufsize
)
2716 struct ssh_channel
*c
;
2718 if (enable
== ssh
->throttled_all
)
2720 ssh
->throttled_all
= enable
;
2721 ssh
->overall_bufsize
= bufsize
;
2724 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
2726 case CHAN_MAINSESSION
:
2728 * This is treated separately, outside the switch.
2732 x11_override_throttle(c
->u
.x11
.s
, enable
);
2735 /* Agent channels require no buffer management. */
2738 pfd_override_throttle(c
->u
.pfd
.s
, enable
);
2745 * Username and password input, abstracted off into routines
2746 * reusable in several places - even between SSH-1 and SSH-2.
2749 /* Set up a username or password input loop on a given buffer. */
2750 static void setup_userpass_input(Ssh ssh
, char *buffer
, int buflen
, int echo
)
2752 ssh
->userpass_input_buffer
= buffer
;
2753 ssh
->userpass_input_buflen
= buflen
;
2754 ssh
->userpass_input_bufpos
= 0;
2755 ssh
->userpass_input_echo
= echo
;
2759 * Process some terminal data in the course of username/password
2760 * input. Returns >0 for success (line of input returned in
2761 * buffer), <0 for failure (user hit ^C/^D, bomb out and exit), 0
2762 * for inconclusive (keep waiting for more input please).
2764 static int process_userpass_input(Ssh ssh
, unsigned char *in
, int inlen
)
2769 switch (c
= *in
++) {
2772 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
] = 0;
2773 ssh
->userpass_input_buffer
[ssh
->userpass_input_buflen
-1] = 0;
2778 if (ssh
->userpass_input_bufpos
> 0) {
2779 if (ssh
->userpass_input_echo
)
2780 c_write_str(ssh
, "\b \b");
2781 ssh
->userpass_input_bufpos
--;
2786 while (ssh
->userpass_input_bufpos
> 0) {
2787 if (ssh
->userpass_input_echo
)
2788 c_write_str(ssh
, "\b \b");
2789 ssh
->userpass_input_bufpos
--;
2798 * This simplistic check for printability is disabled
2799 * when we're doing password input, because some people
2800 * have control characters in their passwords.o
2802 if ((!ssh
->userpass_input_echo
||
2803 (c
>= ' ' && c
<= '~') ||
2804 ((unsigned char) c
>= 160))
2805 && ssh
->userpass_input_bufpos
< ssh
->userpass_input_buflen
-1) {
2806 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
++] = c
;
2807 if (ssh
->userpass_input_echo
)
2808 c_write(ssh
, &c
, 1);
2816 static void ssh_agent_callback(void *sshv
, void *reply
, int replylen
)
2818 Ssh ssh
= (Ssh
) sshv
;
2820 ssh
->agent_response
= reply
;
2821 ssh
->agent_response_len
= replylen
;
2823 if (ssh
->version
== 1)
2824 do_ssh1_login(ssh
, NULL
, -1, NULL
);
2826 do_ssh2_authconn(ssh
, NULL
, -1, NULL
);
2829 static void ssh_dialog_callback(void *sshv
, int ret
)
2831 Ssh ssh
= (Ssh
) sshv
;
2833 ssh
->user_response
= ret
;
2835 if (ssh
->version
== 1)
2836 do_ssh1_login(ssh
, NULL
, -1, NULL
);
2838 do_ssh2_transport(ssh
, NULL
, -1, NULL
);
2841 * This may have unfrozen the SSH connection, so do a
2844 ssh_process_queued_incoming_data(ssh
);
2847 static void ssh_agentf_callback(void *cv
, void *reply
, int replylen
)
2849 struct ssh_channel
*c
= (struct ssh_channel
*)cv
;
2851 void *sentreply
= reply
;
2854 /* Fake SSH_AGENT_FAILURE. */
2855 sentreply
= "\0\0\0\1\5";
2858 if (ssh
->version
== 2) {
2859 ssh2_add_channel_data(c
, sentreply
, replylen
);
2862 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
2863 PKT_INT
, c
->remoteid
,
2866 PKT_DATA
, sentreply
, replylen
,
2875 * Handle the key exchange and user authentication phases.
2877 static int do_ssh1_login(Ssh ssh
, unsigned char *in
, int inlen
,
2878 struct Packet
*pktin
)
2881 unsigned char cookie
[8], *ptr
;
2882 struct RSAKey servkey
, hostkey
;
2883 struct MD5Context md5c
;
2884 struct do_ssh1_login_state
{
2886 unsigned char *rsabuf
, *keystr1
, *keystr2
;
2887 unsigned long supported_ciphers_mask
, supported_auths_mask
;
2888 int tried_publickey
, tried_agent
;
2889 int tis_auth_refused
, ccard_auth_refused
;
2890 unsigned char session_id
[16];
2893 void *publickey_blob
;
2894 int publickey_bloblen
;
2900 unsigned char request
[5], *response
, *p
;
2910 crState(do_ssh1_login_state
);
2912 crBegin(ssh
->do_ssh1_login_crstate
);
2917 if (pktin
->type
!= SSH1_SMSG_PUBLIC_KEY
) {
2918 bombout(("Public key packet not received"));
2922 logevent("Received public keys");
2924 ptr
= ssh_pkt_getdata(pktin
, 8);
2926 bombout(("SSH-1 public key packet stopped before random cookie"));
2929 memcpy(cookie
, ptr
, 8);
2931 if (!ssh1_pkt_getrsakey(pktin
, &servkey
, &s
->keystr1
) ||
2932 !ssh1_pkt_getrsakey(pktin
, &hostkey
, &s
->keystr2
)) {
2933 bombout(("Failed to read SSH-1 public keys from public key packet"));
2938 * Log the host key fingerprint.
2942 logevent("Host key fingerprint is:");
2943 strcpy(logmsg
, " ");
2944 hostkey
.comment
= NULL
;
2945 rsa_fingerprint(logmsg
+ strlen(logmsg
),
2946 sizeof(logmsg
) - strlen(logmsg
), &hostkey
);
2950 ssh
->v1_remote_protoflags
= ssh_pkt_getuint32(pktin
);
2951 s
->supported_ciphers_mask
= ssh_pkt_getuint32(pktin
);
2952 s
->supported_auths_mask
= ssh_pkt_getuint32(pktin
);
2954 ssh
->v1_local_protoflags
=
2955 ssh
->v1_remote_protoflags
& SSH1_PROTOFLAGS_SUPPORTED
;
2956 ssh
->v1_local_protoflags
|= SSH1_PROTOFLAG_SCREEN_NUMBER
;
2959 MD5Update(&md5c
, s
->keystr2
, hostkey
.bytes
);
2960 MD5Update(&md5c
, s
->keystr1
, servkey
.bytes
);
2961 MD5Update(&md5c
, cookie
, 8);
2962 MD5Final(s
->session_id
, &md5c
);
2964 for (i
= 0; i
< 32; i
++)
2965 ssh
->session_key
[i
] = random_byte();
2968 * Verify that the `bits' and `bytes' parameters match.
2970 if (hostkey
.bits
> hostkey
.bytes
* 8 ||
2971 servkey
.bits
> servkey
.bytes
* 8) {
2972 bombout(("SSH-1 public keys were badly formatted"));
2976 s
->len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
2978 s
->rsabuf
= snewn(s
->len
, unsigned char);
2980 fatalbox("Out of memory");
2983 * Verify the host key.
2987 * First format the key into a string.
2989 int len
= rsastr_len(&hostkey
);
2990 char fingerprint
[100];
2991 char *keystr
= snewn(len
, char);
2993 fatalbox("Out of memory");
2994 rsastr_fmt(keystr
, &hostkey
);
2995 rsa_fingerprint(fingerprint
, sizeof(fingerprint
), &hostkey
);
2997 ssh_set_frozen(ssh
, 1);
2998 s
->dlgret
= verify_ssh_host_key(ssh
->frontend
,
2999 ssh
->savedhost
, ssh
->savedport
,
3000 "rsa", keystr
, fingerprint
,
3001 ssh_dialog_callback
, ssh
);
3003 if (s
->dlgret
< 0) {
3007 bombout(("Unexpected data from server while waiting"
3008 " for user host key response"));
3011 } while (pktin
|| inlen
> 0);
3012 s
->dlgret
= ssh
->user_response
;
3014 ssh_set_frozen(ssh
, 0);
3016 if (s
->dlgret
== 0) {
3017 ssh
->close_expected
= TRUE
;
3018 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
3023 for (i
= 0; i
< 32; i
++) {
3024 s
->rsabuf
[i
] = ssh
->session_key
[i
];
3026 s
->rsabuf
[i
] ^= s
->session_id
[i
];
3029 if (hostkey
.bytes
> servkey
.bytes
) {
3030 ret
= rsaencrypt(s
->rsabuf
, 32, &servkey
);
3032 ret
= rsaencrypt(s
->rsabuf
, servkey
.bytes
, &hostkey
);
3034 ret
= rsaencrypt(s
->rsabuf
, 32, &hostkey
);
3036 ret
= rsaencrypt(s
->rsabuf
, hostkey
.bytes
, &servkey
);
3039 bombout(("SSH-1 public key encryptions failed due to bad formatting"));
3043 logevent("Encrypted session key");
3046 int cipher_chosen
= 0, warn
= 0;
3047 char *cipher_string
= NULL
;
3049 for (i
= 0; !cipher_chosen
&& i
< CIPHER_MAX
; i
++) {
3050 int next_cipher
= ssh
->cfg
.ssh_cipherlist
[i
];
3051 if (next_cipher
== CIPHER_WARN
) {
3052 /* If/when we choose a cipher, warn about it */
3054 } else if (next_cipher
== CIPHER_AES
) {
3055 /* XXX Probably don't need to mention this. */
3056 logevent("AES not supported in SSH-1, skipping");
3058 switch (next_cipher
) {
3059 case CIPHER_3DES
: s
->cipher_type
= SSH_CIPHER_3DES
;
3060 cipher_string
= "3DES"; break;
3061 case CIPHER_BLOWFISH
: s
->cipher_type
= SSH_CIPHER_BLOWFISH
;
3062 cipher_string
= "Blowfish"; break;
3063 case CIPHER_DES
: s
->cipher_type
= SSH_CIPHER_DES
;
3064 cipher_string
= "single-DES"; break;
3066 if (s
->supported_ciphers_mask
& (1 << s
->cipher_type
))
3070 if (!cipher_chosen
) {
3071 if ((s
->supported_ciphers_mask
& (1 << SSH_CIPHER_3DES
)) == 0)
3072 bombout(("Server violates SSH-1 protocol by not "
3073 "supporting 3DES encryption"));
3075 /* shouldn't happen */
3076 bombout(("No supported ciphers found"));
3080 /* Warn about chosen cipher if necessary. */
3082 ssh_set_frozen(ssh
, 1);
3083 s
->dlgret
= askalg(ssh
->frontend
, "cipher", cipher_string
,
3084 ssh_dialog_callback
, ssh
);
3085 if (s
->dlgret
< 0) {
3089 bombout(("Unexpected data from server while waiting"
3090 " for user response"));
3093 } while (pktin
|| inlen
> 0);
3094 s
->dlgret
= ssh
->user_response
;
3096 ssh_set_frozen(ssh
, 0);
3097 if (s
->dlgret
== 0) {
3098 ssh
->close_expected
= TRUE
;
3099 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
3105 switch (s
->cipher_type
) {
3106 case SSH_CIPHER_3DES
:
3107 logevent("Using 3DES encryption");
3109 case SSH_CIPHER_DES
:
3110 logevent("Using single-DES encryption");
3112 case SSH_CIPHER_BLOWFISH
:
3113 logevent("Using Blowfish encryption");
3117 send_packet(ssh
, SSH1_CMSG_SESSION_KEY
,
3118 PKT_CHAR
, s
->cipher_type
,
3119 PKT_DATA
, cookie
, 8,
3120 PKT_CHAR
, (s
->len
* 8) >> 8, PKT_CHAR
, (s
->len
* 8) & 0xFF,
3121 PKT_DATA
, s
->rsabuf
, s
->len
,
3122 PKT_INT
, ssh
->v1_local_protoflags
, PKT_END
);
3124 logevent("Trying to enable encryption...");
3128 ssh
->cipher
= (s
->cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish_ssh1
:
3129 s
->cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
3131 ssh
->v1_cipher_ctx
= ssh
->cipher
->make_context();
3132 ssh
->cipher
->sesskey(ssh
->v1_cipher_ctx
, ssh
->session_key
);
3133 logeventf(ssh
, "Initialised %s encryption", ssh
->cipher
->text_name
);
3135 ssh
->crcda_ctx
= crcda_make_context();
3136 logevent("Installing CRC compensation attack detector");
3138 if (servkey
.modulus
) {
3139 sfree(servkey
.modulus
);
3140 servkey
.modulus
= NULL
;
3142 if (servkey
.exponent
) {
3143 sfree(servkey
.exponent
);
3144 servkey
.exponent
= NULL
;
3146 if (hostkey
.modulus
) {
3147 sfree(hostkey
.modulus
);
3148 hostkey
.modulus
= NULL
;
3150 if (hostkey
.exponent
) {
3151 sfree(hostkey
.exponent
);
3152 hostkey
.exponent
= NULL
;
3156 if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
3157 bombout(("Encryption not successfully enabled"));
3161 logevent("Successfully started encryption");
3165 if (!*ssh
->cfg
.username
) {
3166 if (ssh_get_line
&& !ssh_getline_pw_only
) {
3167 if (!ssh_get_line("login as: ",
3168 s
->username
, sizeof(s
->username
), FALSE
)) {
3170 * get_line failed to get a username.
3173 logevent("No username provided. Abandoning session.");
3174 ssh
->close_expected
= TRUE
;
3175 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
3179 int ret
; /* need not be kept over crReturn */
3180 c_write_str(ssh
, "login as: ");
3183 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
3185 crWaitUntil(!pktin
);
3186 ret
= process_userpass_input(ssh
, in
, inlen
);
3190 c_write_str(ssh
, "\r\n");
3193 strncpy(s
->username
, ssh
->cfg
.username
, sizeof(s
->username
));
3194 s
->username
[sizeof(s
->username
)-1] = '\0';
3197 send_packet(ssh
, SSH1_CMSG_USER
, PKT_STR
, s
->username
, PKT_END
);
3199 char userlog
[22 + sizeof(s
->username
)];
3200 sprintf(userlog
, "Sent username \"%s\"", s
->username
);
3202 if (flags
& FLAG_INTERACTIVE
&&
3203 (!((flags
& FLAG_STDERR
) && (flags
& FLAG_VERBOSE
)))) {
3204 strcat(userlog
, "\r\n");
3205 c_write_str(ssh
, userlog
);
3212 if ((ssh
->remote_bugs
& BUG_CHOKES_ON_RSA
)) {
3213 /* We must not attempt PK auth. Pretend we've already tried it. */
3214 s
->tried_publickey
= s
->tried_agent
= 1;
3216 s
->tried_publickey
= s
->tried_agent
= 0;
3218 s
->tis_auth_refused
= s
->ccard_auth_refused
= 0;
3219 /* Load the public half of ssh->cfg.keyfile so we notice if it's in Pageant */
3220 if (!filename_is_null(ssh
->cfg
.keyfile
)) {
3221 if (!rsakey_pubblob(&ssh
->cfg
.keyfile
,
3222 &s
->publickey_blob
, &s
->publickey_bloblen
, NULL
))
3223 s
->publickey_blob
= NULL
;
3225 s
->publickey_blob
= NULL
;
3227 while (pktin
->type
== SSH1_SMSG_FAILURE
) {
3228 s
->pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
3230 if (agent_exists() && !s
->tried_agent
) {
3232 * Attempt RSA authentication using Pageant.
3238 logevent("Pageant is running. Requesting keys.");
3240 /* Request the keys held by the agent. */
3241 PUT_32BIT(s
->request
, 1);
3242 s
->request
[4] = SSH1_AGENTC_REQUEST_RSA_IDENTITIES
;
3243 if (!agent_query(s
->request
, 5, &r
, &s
->responselen
,
3244 ssh_agent_callback
, ssh
)) {
3248 bombout(("Unexpected data from server while waiting"
3249 " for agent response"));
3252 } while (pktin
|| inlen
> 0);
3253 r
= ssh
->agent_response
;
3254 s
->responselen
= ssh
->agent_response_len
;
3256 s
->response
= (unsigned char *) r
;
3257 if (s
->response
&& s
->responselen
>= 5 &&
3258 s
->response
[4] == SSH1_AGENT_RSA_IDENTITIES_ANSWER
) {
3259 s
->p
= s
->response
+ 5;
3260 s
->nkeys
= GET_32BIT(s
->p
);
3262 logeventf(ssh
, "Pageant has %d SSH-1 keys", s
->nkeys
);
3263 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
3264 logeventf(ssh
, "Trying Pageant key #%d", s
->keyi
);
3265 if (s
->publickey_blob
&&
3266 !memcmp(s
->p
, s
->publickey_blob
,
3267 s
->publickey_bloblen
)) {
3268 logevent("This key matches configured key file");
3269 s
->tried_publickey
= 1;
3274 do { /* do while (0) to make breaking easy */
3275 n
= ssh1_read_bignum
3276 (s
->p
, s
->responselen
-(s
->p
-s
->response
),
3281 n
= ssh1_read_bignum
3282 (s
->p
, s
->responselen
-(s
->p
-s
->response
),
3287 if (s
->responselen
- (s
->p
-s
->response
) < 4)
3289 s
->commentlen
= GET_32BIT(s
->p
);
3291 if (s
->responselen
- (s
->p
-s
->response
) <
3294 s
->commentp
= (char *)s
->p
;
3295 s
->p
+= s
->commentlen
;
3299 logevent("Pageant key list packet was truncated");
3303 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
3304 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
3306 if (pktin
->type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
3307 logevent("Key refused");
3310 logevent("Received RSA challenge");
3311 if ((s
->challenge
= ssh1_pkt_getmp(pktin
)) == NULL
) {
3312 bombout(("Server's RSA challenge was badly formatted"));
3317 char *agentreq
, *q
, *ret
;
3320 len
= 1 + 4; /* message type, bit count */
3321 len
+= ssh1_bignum_length(s
->key
.exponent
);
3322 len
+= ssh1_bignum_length(s
->key
.modulus
);
3323 len
+= ssh1_bignum_length(s
->challenge
);
3324 len
+= 16; /* session id */
3325 len
+= 4; /* response format */
3326 agentreq
= snewn(4 + len
, char);
3327 PUT_32BIT(agentreq
, len
);
3329 *q
++ = SSH1_AGENTC_RSA_CHALLENGE
;
3330 PUT_32BIT(q
, bignum_bitcount(s
->key
.modulus
));
3332 q
+= ssh1_write_bignum(q
, s
->key
.exponent
);
3333 q
+= ssh1_write_bignum(q
, s
->key
.modulus
);
3334 q
+= ssh1_write_bignum(q
, s
->challenge
);
3335 memcpy(q
, s
->session_id
, 16);
3337 PUT_32BIT(q
, 1); /* response format */
3338 if (!agent_query(agentreq
, len
+ 4, &vret
, &retlen
,
3339 ssh_agent_callback
, ssh
)) {
3344 bombout(("Unexpected data from server"
3345 " while waiting for agent"
3349 } while (pktin
|| inlen
> 0);
3350 vret
= ssh
->agent_response
;
3351 retlen
= ssh
->agent_response_len
;
3356 if (ret
[4] == SSH1_AGENT_RSA_RESPONSE
) {
3357 logevent("Sending Pageant's response");
3358 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
3359 PKT_DATA
, ret
+ 5, 16,
3363 if (pktin
->type
== SSH1_SMSG_SUCCESS
) {
3365 ("Pageant's response accepted");
3366 if (flags
& FLAG_VERBOSE
) {
3367 c_write_str(ssh
, "Authenticated using"
3369 c_write(ssh
, s
->commentp
,
3371 c_write_str(ssh
, "\" from agent\r\n");
3376 ("Pageant's response not accepted");
3379 ("Pageant failed to answer challenge");
3383 logevent("No reply received from Pageant");
3386 freebn(s
->key
.exponent
);
3387 freebn(s
->key
.modulus
);
3388 freebn(s
->challenge
);
3397 if (!filename_is_null(ssh
->cfg
.keyfile
) && !s
->tried_publickey
)
3398 s
->pwpkt_type
= SSH1_CMSG_AUTH_RSA
;
3400 if (ssh
->cfg
.try_tis_auth
&&
3401 (s
->supported_auths_mask
& (1 << SSH1_AUTH_TIS
)) &&
3402 !s
->tis_auth_refused
) {
3403 s
->pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
3404 logevent("Requested TIS authentication");
3405 send_packet(ssh
, SSH1_CMSG_AUTH_TIS
, PKT_END
);
3407 if (pktin
->type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
3408 logevent("TIS authentication declined");
3409 if (flags
& FLAG_INTERACTIVE
)
3410 c_write_str(ssh
, "TIS authentication refused.\r\n");
3411 s
->tis_auth_refused
= 1;
3417 ssh_pkt_getstring(pktin
, &challenge
, &challengelen
);
3419 bombout(("TIS challenge packet was badly formed"));
3422 c_write_str(ssh
, "Using TIS authentication.\r\n");
3423 logevent("Received TIS challenge");
3424 if (challengelen
> sizeof(s
->prompt
) - 1)
3425 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
3426 memcpy(s
->prompt
, challenge
, challengelen
);
3427 /* Prompt heuristic comes from OpenSSH */
3428 strncpy(s
->prompt
+ challengelen
,
3429 memchr(s
->prompt
, '\n', challengelen
) ?
3430 "": "\r\nResponse: ",
3431 (sizeof s
->prompt
) - challengelen
);
3432 s
->prompt
[(sizeof s
->prompt
) - 1] = '\0';
3435 if (ssh
->cfg
.try_tis_auth
&&
3436 (s
->supported_auths_mask
& (1 << SSH1_AUTH_CCARD
)) &&
3437 !s
->ccard_auth_refused
) {
3438 s
->pwpkt_type
= SSH1_CMSG_AUTH_CCARD_RESPONSE
;
3439 logevent("Requested CryptoCard authentication");
3440 send_packet(ssh
, SSH1_CMSG_AUTH_CCARD
, PKT_END
);
3442 if (pktin
->type
!= SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
3443 logevent("CryptoCard authentication declined");
3444 c_write_str(ssh
, "CryptoCard authentication refused.\r\n");
3445 s
->ccard_auth_refused
= 1;
3451 ssh_pkt_getstring(pktin
, &challenge
, &challengelen
);
3453 bombout(("CryptoCard challenge packet was badly formed"));
3456 c_write_str(ssh
, "Using CryptoCard authentication.\r\n");
3457 logevent("Received CryptoCard challenge");
3458 if (challengelen
> sizeof(s
->prompt
) - 1)
3459 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
3460 memcpy(s
->prompt
, challenge
, challengelen
);
3461 strncpy(s
->prompt
+ challengelen
,
3462 memchr(s
->prompt
, '\n', challengelen
) ?
3463 "" : "\r\nResponse: ",
3464 sizeof(s
->prompt
) - challengelen
);
3465 s
->prompt
[sizeof(s
->prompt
) - 1] = '\0';
3468 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
3469 sprintf(s
->prompt
, "%.90s@%.90s's password: ",
3470 s
->username
, ssh
->savedhost
);
3472 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
3473 char *comment
= NULL
;
3475 if (flags
& FLAG_VERBOSE
)
3476 c_write_str(ssh
, "Trying public key authentication.\r\n");
3477 logeventf(ssh
, "Trying public key \"%s\"",
3478 filename_to_str(&ssh
->cfg
.keyfile
));
3479 type
= key_type(&ssh
->cfg
.keyfile
);
3480 if (type
!= SSH_KEYTYPE_SSH1
) {
3481 char *msg
= dupprintf("Key is of wrong type (%s)",
3482 key_type_to_str(type
));
3484 c_write_str(ssh
, msg
);
3485 c_write_str(ssh
, "\r\n");
3487 s
->tried_publickey
= 1;
3490 if (!rsakey_encrypted(&ssh
->cfg
.keyfile
, &comment
)) {
3491 if (flags
& FLAG_VERBOSE
)
3492 c_write_str(ssh
, "No passphrase required.\r\n");
3495 sprintf(s
->prompt
, "Passphrase for key \"%.100s\": ", comment
);
3500 * Show password prompt, having first obtained it via a TIS
3501 * or CryptoCard exchange if we're doing TIS or CryptoCard
3505 if (!ssh_get_line(s
->prompt
, s
->password
,
3506 sizeof(s
->password
), TRUE
)) {
3508 * get_line failed to get a password (for example
3509 * because one was supplied on the command line
3510 * which has already failed to work). Terminate.
3512 send_packet(ssh
, SSH1_MSG_DISCONNECT
,
3513 PKT_STR
, "No more passwords available to try",
3515 logevent("Unable to authenticate");
3516 connection_fatal(ssh
->frontend
, "Unable to authenticate");
3517 ssh
->close_expected
= TRUE
;
3518 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
3522 /* Prompt may have come from server. We've munged it a bit, so
3523 * we know it to be zero-terminated at least once. */
3524 int ret
; /* need not be saved over crReturn */
3525 c_write_untrusted(ssh
, s
->prompt
, strlen(s
->prompt
));
3528 setup_userpass_input(ssh
, s
->password
, sizeof(s
->password
), 0);
3530 crWaitUntil(!pktin
);
3531 ret
= process_userpass_input(ssh
, in
, inlen
);
3535 c_write_str(ssh
, "\r\n");
3539 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
3541 * Try public key authentication with the specified
3544 s
->tried_publickey
= 1;
3547 const char *error
= NULL
;
3548 int ret
= loadrsakey(&ssh
->cfg
.keyfile
, &s
->key
, s
->password
,
3551 c_write_str(ssh
, "Couldn't load private key from ");
3552 c_write_str(ssh
, filename_to_str(&ssh
->cfg
.keyfile
));
3553 c_write_str(ssh
, " (");
3554 c_write_str(ssh
, error
);
3555 c_write_str(ssh
, ").\r\n");
3556 continue; /* go and try password */
3559 c_write_str(ssh
, "Wrong passphrase.\r\n");
3560 s
->tried_publickey
= 0;
3561 continue; /* try again */
3566 * Send a public key attempt.
3568 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
3569 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
3572 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3573 c_write_str(ssh
, "Server refused our public key.\r\n");
3574 continue; /* go and try password */
3576 if (pktin
->type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
3577 bombout(("Bizarre response to offer of public key"));
3583 unsigned char buffer
[32];
3584 Bignum challenge
, response
;
3586 if ((challenge
= ssh1_pkt_getmp(pktin
)) == NULL
) {
3587 bombout(("Server's RSA challenge was badly formatted"));
3590 response
= rsadecrypt(challenge
, &s
->key
);
3591 freebn(s
->key
.private_exponent
);/* burn the evidence */
3593 for (i
= 0; i
< 32; i
++) {
3594 buffer
[i
] = bignum_byte(response
, 31 - i
);
3598 MD5Update(&md5c
, buffer
, 32);
3599 MD5Update(&md5c
, s
->session_id
, 16);
3600 MD5Final(buffer
, &md5c
);
3602 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
3603 PKT_DATA
, buffer
, 16, PKT_END
);
3610 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3611 if (flags
& FLAG_VERBOSE
)
3612 c_write_str(ssh
, "Failed to authenticate with"
3613 " our public key.\r\n");
3614 continue; /* go and try password */
3615 } else if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
3616 bombout(("Bizarre response to RSA authentication response"));
3620 break; /* we're through! */
3622 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
3624 * Defence against traffic analysis: we send a
3625 * whole bunch of packets containing strings of
3626 * different lengths. One of these strings is the
3627 * password, in a SSH1_CMSG_AUTH_PASSWORD packet.
3628 * The others are all random data in
3629 * SSH1_MSG_IGNORE packets. This way a passive
3630 * listener can't tell which is the password, and
3631 * hence can't deduce the password length.
3633 * Anybody with a password length greater than 16
3634 * bytes is going to have enough entropy in their
3635 * password that a listener won't find it _that_
3636 * much help to know how long it is. So what we'll
3639 * - if password length < 16, we send 15 packets
3640 * containing string lengths 1 through 15
3642 * - otherwise, we let N be the nearest multiple
3643 * of 8 below the password length, and send 8
3644 * packets containing string lengths N through
3645 * N+7. This won't obscure the order of
3646 * magnitude of the password length, but it will
3647 * introduce a bit of extra uncertainty.
3649 * A few servers (the old 1.2.18 through 1.2.22)
3650 * can't deal with SSH1_MSG_IGNORE. For these
3651 * servers, we need an alternative defence. We make
3652 * use of the fact that the password is interpreted
3653 * as a C string: so we can append a NUL, then some
3656 * One server (a Cisco one) can deal with neither
3657 * SSH1_MSG_IGNORE _nor_ a padded password string.
3658 * For this server we are left with no defences
3659 * against password length sniffing.
3661 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
)) {
3663 * The server can deal with SSH1_MSG_IGNORE, so
3664 * we can use the primary defence.
3666 int bottom
, top
, pwlen
, i
;
3669 pwlen
= strlen(s
->password
);
3671 bottom
= 0; /* zero length passwords are OK! :-) */
3674 bottom
= pwlen
& ~7;
3678 assert(pwlen
>= bottom
&& pwlen
<= top
);
3680 randomstr
= snewn(top
+ 1, char);
3682 for (i
= bottom
; i
<= top
; i
++) {
3684 defer_packet(ssh
, s
->pwpkt_type
,
3685 PKTT_PASSWORD
, PKT_STR
, s
->password
,
3686 PKTT_OTHER
, PKT_END
);
3688 for (j
= 0; j
< i
; j
++) {
3690 randomstr
[j
] = random_byte();
3691 } while (randomstr
[j
] == '\0');
3693 randomstr
[i
] = '\0';
3694 defer_packet(ssh
, SSH1_MSG_IGNORE
,
3695 PKT_STR
, randomstr
, PKT_END
);
3698 logevent("Sending password with camouflage packets");
3699 ssh_pkt_defersend(ssh
);
3702 else if (!(ssh
->remote_bugs
& BUG_NEEDS_SSH1_PLAIN_PASSWORD
)) {
3704 * The server can't deal with SSH1_MSG_IGNORE
3705 * but can deal with padded passwords, so we
3706 * can use the secondary defence.
3712 len
= strlen(s
->password
);
3713 if (len
< sizeof(string
)) {
3715 strcpy(string
, s
->password
);
3716 len
++; /* cover the zero byte */
3717 while (len
< sizeof(string
)) {
3718 string
[len
++] = (char) random_byte();
3723 logevent("Sending length-padded password");
3724 send_packet(ssh
, s
->pwpkt_type
, PKTT_PASSWORD
,
3725 PKT_INT
, len
, PKT_DATA
, ss
, len
,
3726 PKTT_OTHER
, PKT_END
);
3729 * The server has _both_
3730 * BUG_CHOKES_ON_SSH1_IGNORE and
3731 * BUG_NEEDS_SSH1_PLAIN_PASSWORD. There is
3732 * therefore nothing we can do.
3735 len
= strlen(s
->password
);
3736 logevent("Sending unpadded password");
3737 send_packet(ssh
, s
->pwpkt_type
,
3738 PKTT_PASSWORD
, PKT_INT
, len
,
3739 PKT_DATA
, s
->password
, len
,
3740 PKTT_OTHER
, PKT_END
);
3743 send_packet(ssh
, s
->pwpkt_type
, PKTT_PASSWORD
,
3744 PKT_STR
, s
->password
, PKTT_OTHER
, PKT_END
);
3747 logevent("Sent password");
3748 memset(s
->password
, 0, strlen(s
->password
));
3750 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3751 if (flags
& FLAG_VERBOSE
)
3752 c_write_str(ssh
, "Access denied\r\n");
3753 logevent("Authentication refused");
3754 } else if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
3755 bombout(("Strange packet received, type %d", pktin
->type
));
3760 logevent("Authentication successful");
3765 void sshfwd_close(struct ssh_channel
*c
)
3769 if (ssh
->state
== SSH_STATE_CLOSED
)
3772 if (c
&& !c
->closes
) {
3774 * If halfopen is true, we have sent
3775 * CHANNEL_OPEN for this channel, but it hasn't even been
3776 * acknowledged by the server. So we must set a close flag
3777 * on it now, and then when the server acks the channel
3778 * open, we can close it then.
3781 if (ssh
->version
== 1) {
3782 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
, PKT_INT
, c
->remoteid
,
3785 struct Packet
*pktout
;
3786 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
3787 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
3788 ssh2_pkt_send(ssh
, pktout
);
3791 c
->closes
= 1; /* sent MSG_CLOSE */
3792 if (c
->type
== CHAN_X11
) {
3794 logevent("Forwarded X11 connection terminated");
3795 } else if (c
->type
== CHAN_SOCKDATA
||
3796 c
->type
== CHAN_SOCKDATA_DORMANT
) {
3798 logevent("Forwarded port closed");
3803 int sshfwd_write(struct ssh_channel
*c
, char *buf
, int len
)
3807 if (ssh
->state
== SSH_STATE_CLOSED
)
3810 if (ssh
->version
== 1) {
3811 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
3812 PKT_INT
, c
->remoteid
,
3814 PKT_INT
, len
, PKT_DATA
, buf
, len
,
3815 PKTT_OTHER
, PKT_END
);
3817 * In SSH-1 we can return 0 here - implying that forwarded
3818 * connections are never individually throttled - because
3819 * the only circumstance that can cause throttling will be
3820 * the whole SSH connection backing up, in which case
3821 * _everything_ will be throttled as a whole.
3825 ssh2_add_channel_data(c
, buf
, len
);
3826 return ssh2_try_send(c
);
3830 void sshfwd_unthrottle(struct ssh_channel
*c
, int bufsize
)
3834 if (ssh
->state
== SSH_STATE_CLOSED
)
3837 if (ssh
->version
== 1) {
3838 if (c
->v
.v1
.throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
3839 c
->v
.v1
.throttling
= 0;
3840 ssh1_throttle(ssh
, -1);
3843 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
3847 static void ssh_queueing_handler(Ssh ssh
, struct Packet
*pktin
)
3849 struct queued_handler
*qh
= ssh
->qhead
;
3853 assert(pktin
->type
== qh
->msg1
|| pktin
->type
== qh
->msg2
);
3856 assert(ssh
->packet_dispatch
[qh
->msg1
] == ssh_queueing_handler
);
3857 ssh
->packet_dispatch
[qh
->msg1
] = NULL
;
3860 assert(ssh
->packet_dispatch
[qh
->msg2
] == ssh_queueing_handler
);
3861 ssh
->packet_dispatch
[qh
->msg2
] = NULL
;
3865 ssh
->qhead
= qh
->next
;
3867 if (ssh
->qhead
->msg1
> 0) {
3868 assert(ssh
->packet_dispatch
[ssh
->qhead
->msg1
] == NULL
);
3869 ssh
->packet_dispatch
[ssh
->qhead
->msg1
] = ssh_queueing_handler
;
3871 if (ssh
->qhead
->msg2
> 0) {
3872 assert(ssh
->packet_dispatch
[ssh
->qhead
->msg2
] == NULL
);
3873 ssh
->packet_dispatch
[ssh
->qhead
->msg2
] = ssh_queueing_handler
;
3876 ssh
->qhead
= ssh
->qtail
= NULL
;
3877 ssh
->packet_dispatch
[pktin
->type
] = NULL
;
3880 qh
->handler(ssh
, pktin
, qh
->ctx
);
3885 static void ssh_queue_handler(Ssh ssh
, int msg1
, int msg2
,
3886 chandler_fn_t handler
, void *ctx
)
3888 struct queued_handler
*qh
;
3890 qh
= snew(struct queued_handler
);
3893 qh
->handler
= handler
;
3897 if (ssh
->qtail
== NULL
) {
3901 assert(ssh
->packet_dispatch
[qh
->msg1
] == NULL
);
3902 ssh
->packet_dispatch
[qh
->msg1
] = ssh_queueing_handler
;
3905 assert(ssh
->packet_dispatch
[qh
->msg2
] == NULL
);
3906 ssh
->packet_dispatch
[qh
->msg2
] = ssh_queueing_handler
;
3909 ssh
->qtail
->next
= qh
;
3914 static void ssh_rportfwd_succfail(Ssh ssh
, struct Packet
*pktin
, void *ctx
)
3916 struct ssh_rportfwd
*rpf
, *pf
= (struct ssh_rportfwd
*)ctx
;
3918 if (pktin
->type
== (ssh
->version
== 1 ? SSH1_SMSG_SUCCESS
:
3919 SSH2_MSG_REQUEST_SUCCESS
)) {
3920 logeventf(ssh
, "Remote port forwarding from %s enabled",
3923 logeventf(ssh
, "Remote port forwarding from %s refused",
3926 rpf
= del234(ssh
->rportfwds
, pf
);
3932 static void ssh_setup_portfwd(Ssh ssh
, const Config
*cfg
)
3934 const char *portfwd_strptr
= cfg
->portfwd
;
3935 struct ssh_portfwd
*epf
;
3938 if (!ssh
->portfwds
) {
3939 ssh
->portfwds
= newtree234(ssh_portcmp
);
3942 * Go through the existing port forwardings and tag them
3943 * with status==DESTROY. Any that we want to keep will be
3944 * re-enabled (status==KEEP) as we go through the
3945 * configuration and find out which bits are the same as
3948 struct ssh_portfwd
*epf
;
3950 for (i
= 0; (epf
= index234(ssh
->portfwds
, i
)) != NULL
; i
++)
3951 epf
->status
= DESTROY
;
3954 while (*portfwd_strptr
) {
3955 char address_family
, type
;
3956 int sport
,dport
,sserv
,dserv
;
3957 char sports
[256], dports
[256], saddr
[256], host
[256];
3960 address_family
= 'A';
3962 if (*portfwd_strptr
== 'A' ||
3963 *portfwd_strptr
== '4' ||
3964 *portfwd_strptr
== '6')
3965 address_family
= *portfwd_strptr
++;
3966 if (*portfwd_strptr
== 'L' ||
3967 *portfwd_strptr
== 'R' ||
3968 *portfwd_strptr
== 'D')
3969 type
= *portfwd_strptr
++;
3974 while (*portfwd_strptr
&& *portfwd_strptr
!= '\t') {
3975 if (*portfwd_strptr
== ':') {
3977 * We've seen a colon in the middle of the
3978 * source port number. This means that
3979 * everything we've seen until now is the
3980 * source _address_, so we'll move it into
3981 * saddr and start sports from the beginning
3986 if (ssh
->version
== 1 && type
== 'R') {
3987 logeventf(ssh
, "SSH-1 cannot handle remote source address "
3988 "spec \"%s\"; ignoring", sports
);
3990 strcpy(saddr
, sports
);
3993 if (n
< lenof(sports
)-1) sports
[n
++] = *portfwd_strptr
++;
3997 if (*portfwd_strptr
== '\t')
4000 while (*portfwd_strptr
&& *portfwd_strptr
!= ':') {
4001 if (n
< lenof(host
)-1) host
[n
++] = *portfwd_strptr
++;
4004 if (*portfwd_strptr
== ':')
4007 while (*portfwd_strptr
) {
4008 if (n
< lenof(dports
)-1) dports
[n
++] = *portfwd_strptr
++;
4012 dport
= atoi(dports
);
4016 dport
= net_service_lookup(dports
);
4018 logeventf(ssh
, "Service lookup failed for destination"
4019 " port \"%s\"", dports
);
4023 while (*portfwd_strptr
) portfwd_strptr
++;
4027 portfwd_strptr
++; /* eat the NUL and move to next one */
4029 sport
= atoi(sports
);
4033 sport
= net_service_lookup(sports
);
4035 logeventf(ssh
, "Service lookup failed for source"
4036 " port \"%s\"", sports
);
4039 if (sport
&& dport
) {
4040 /* Set up a description of the source port. */
4041 struct ssh_portfwd
*pfrec
, *epfrec
;
4043 pfrec
= snew(struct ssh_portfwd
);
4045 pfrec
->saddr
= *saddr ?
dupstr(saddr
) : NULL
;
4046 pfrec
->sserv
= sserv ?
dupstr(sports
) : NULL
;
4047 pfrec
->sport
= sport
;
4048 pfrec
->daddr
= *host ?
dupstr(host
) : NULL
;
4049 pfrec
->dserv
= dserv ?
dupstr(dports
) : NULL
;
4050 pfrec
->dport
= dport
;
4051 pfrec
->local
= NULL
;
4052 pfrec
->remote
= NULL
;
4053 pfrec
->addressfamily
= (address_family
== '4' ? ADDRTYPE_IPV4
:
4054 address_family
== '6' ? ADDRTYPE_IPV6
:
4057 epfrec
= add234(ssh
->portfwds
, pfrec
);
4058 if (epfrec
!= pfrec
) {
4060 * We already have a port forwarding with precisely
4061 * these parameters. Hence, no need to do anything;
4062 * simply tag the existing one as KEEP.
4064 epfrec
->status
= KEEP
;
4065 free_portfwd(pfrec
);
4067 pfrec
->status
= CREATE
;
4073 * Now go through and destroy any port forwardings which were
4076 for (i
= 0; (epf
= index234(ssh
->portfwds
, i
)) != NULL
; i
++)
4077 if (epf
->status
== DESTROY
) {
4080 message
= dupprintf("%s port forwarding from %s%s%d",
4081 epf
->type
== 'L' ?
"local" :
4082 epf
->type
== 'R' ?
"remote" : "dynamic",
4083 epf
->saddr ? epf
->saddr
: "",
4084 epf
->saddr ?
":" : "",
4087 if (epf
->type
!= 'D') {
4088 char *msg2
= dupprintf("%s to %s:%d", message
,
4089 epf
->daddr
, epf
->dport
);
4094 logeventf(ssh
, "Cancelling %s", message
);
4098 struct ssh_rportfwd
*rpf
= epf
->remote
;
4099 struct Packet
*pktout
;
4102 * Cancel the port forwarding at the server
4105 if (ssh
->version
== 1) {
4107 * We cannot cancel listening ports on the
4108 * server side in SSH-1! There's no message
4109 * to support it. Instead, we simply remove
4110 * the rportfwd record from the local end
4111 * so that any connections the server tries
4112 * to make on it are rejected.
4115 pktout
= ssh2_pkt_init(SSH2_MSG_GLOBAL_REQUEST
);
4116 ssh2_pkt_addstring(pktout
, "cancel-tcpip-forward");
4117 ssh2_pkt_addbool(pktout
, 0);/* _don't_ want reply */
4119 ssh2_pkt_addstring(pktout
, epf
->saddr
);
4120 } else if (ssh
->cfg
.rport_acceptall
) {
4121 /* XXX: ssh->cfg.rport_acceptall may not represent
4122 * what was used to open the original connection,
4123 * since it's reconfigurable. */
4124 ssh2_pkt_addstring(pktout
, "0.0.0.0");
4126 ssh2_pkt_addstring(pktout
, "127.0.0.1");
4128 ssh2_pkt_adduint32(pktout
, epf
->sport
);
4129 ssh2_pkt_send(ssh
, pktout
);
4132 del234(ssh
->rportfwds
, rpf
);
4134 } else if (epf
->local
) {
4135 pfd_terminate(epf
->local
);
4138 delpos234(ssh
->portfwds
, i
);
4140 i
--; /* so we don't skip one in the list */
4144 * And finally, set up any new port forwardings (status==CREATE).
4146 for (i
= 0; (epf
= index234(ssh
->portfwds
, i
)) != NULL
; i
++)
4147 if (epf
->status
== CREATE
) {
4148 char *sportdesc
, *dportdesc
;
4149 sportdesc
= dupprintf("%s%s%s%s%d%s",
4150 epf
->saddr ? epf
->saddr
: "",
4151 epf
->saddr ?
":" : "",
4152 epf
->sserv ? epf
->sserv
: "",
4153 epf
->sserv ?
"(" : "",
4155 epf
->sserv ?
")" : "");
4156 if (epf
->type
== 'D') {
4159 dportdesc
= dupprintf("%s:%s%s%d%s",
4161 epf
->dserv ? epf
->dserv
: "",
4162 epf
->dserv ?
"(" : "",
4164 epf
->dserv ?
")" : "");
4167 if (epf
->type
== 'L') {
4168 const char *err
= pfd_addforward(epf
->daddr
, epf
->dport
,
4169 epf
->saddr
, epf
->sport
,
4172 epf
->addressfamily
);
4174 logeventf(ssh
, "Local %sport %s forwarding to %s%s%s",
4175 epf
->addressfamily
== ADDRTYPE_IPV4 ?
"IPv4 " :
4176 epf
->addressfamily
== ADDRTYPE_IPV6 ?
"IPv6 " : "",
4177 sportdesc
, dportdesc
,
4178 err ?
" failed: " : "", err ? err
: "");
4179 } else if (epf
->type
== 'D') {
4180 const char *err
= pfd_addforward(NULL
, -1,
4181 epf
->saddr
, epf
->sport
,
4184 epf
->addressfamily
);
4186 logeventf(ssh
, "Local %sport %s SOCKS dynamic forwarding%s%s",
4187 epf
->addressfamily
== ADDRTYPE_IPV4 ?
"IPv4 " :
4188 epf
->addressfamily
== ADDRTYPE_IPV6 ?
"IPv6 " : "",
4190 err ?
" failed: " : "", err ? err
: "");
4192 struct ssh_rportfwd
*pf
;
4195 * Ensure the remote port forwardings tree exists.
4197 if (!ssh
->rportfwds
) {
4198 if (ssh
->version
== 1)
4199 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh1
);
4201 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh2
);
4204 pf
= snew(struct ssh_rportfwd
);
4205 strncpy(pf
->dhost
, epf
->daddr
, lenof(pf
->dhost
)-1);
4206 pf
->dhost
[lenof(pf
->dhost
)-1] = '\0';
4207 pf
->dport
= epf
->dport
;
4208 pf
->sport
= epf
->sport
;
4209 if (add234(ssh
->rportfwds
, pf
) != pf
) {
4210 logeventf(ssh
, "Duplicate remote port forwarding to %s:%d",
4211 epf
->daddr
, epf
->dport
);
4214 logeventf(ssh
, "Requesting remote port %s"
4215 " forward to %s", sportdesc
, dportdesc
);
4217 pf
->sportdesc
= sportdesc
;
4222 if (ssh
->version
== 1) {
4223 send_packet(ssh
, SSH1_CMSG_PORT_FORWARD_REQUEST
,
4224 PKT_INT
, epf
->sport
,
4225 PKT_STR
, epf
->daddr
,
4226 PKT_INT
, epf
->dport
,
4228 ssh_queue_handler(ssh
, SSH1_SMSG_SUCCESS
,
4230 ssh_rportfwd_succfail
, pf
);
4232 struct Packet
*pktout
;
4233 pktout
= ssh2_pkt_init(SSH2_MSG_GLOBAL_REQUEST
);
4234 ssh2_pkt_addstring(pktout
, "tcpip-forward");
4235 ssh2_pkt_addbool(pktout
, 1);/* want reply */
4237 ssh2_pkt_addstring(pktout
, epf
->saddr
);
4238 } else if (cfg
->rport_acceptall
) {
4239 ssh2_pkt_addstring(pktout
, "0.0.0.0");
4241 ssh2_pkt_addstring(pktout
, "127.0.0.1");
4243 ssh2_pkt_adduint32(pktout
, epf
->sport
);
4244 ssh2_pkt_send(ssh
, pktout
);
4246 ssh_queue_handler(ssh
, SSH2_MSG_REQUEST_SUCCESS
,
4247 SSH2_MSG_REQUEST_FAILURE
,
4248 ssh_rportfwd_succfail
, pf
);
4257 static void ssh1_smsg_stdout_stderr_data(Ssh ssh
, struct Packet
*pktin
)
4260 int stringlen
, bufsize
;
4262 ssh_pkt_getstring(pktin
, &string
, &stringlen
);
4263 if (string
== NULL
) {
4264 bombout(("Incoming terminal data packet was badly formed"));
4268 bufsize
= from_backend(ssh
->frontend
, pktin
->type
== SSH1_SMSG_STDERR_DATA
,
4270 if (!ssh
->v1_stdout_throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
4271 ssh
->v1_stdout_throttling
= 1;
4272 ssh1_throttle(ssh
, +1);
4276 static void ssh1_smsg_x11_open(Ssh ssh
, struct Packet
*pktin
)
4278 /* Remote side is trying to open a channel to talk to our
4279 * X-Server. Give them back a local channel number. */
4280 struct ssh_channel
*c
;
4281 int remoteid
= ssh_pkt_getuint32(pktin
);
4283 logevent("Received X11 connect request");
4284 /* Refuse if X11 forwarding is disabled. */
4285 if (!ssh
->X11_fwd_enabled
) {
4286 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4287 PKT_INT
, remoteid
, PKT_END
);
4288 logevent("Rejected X11 connect request");
4290 c
= snew(struct ssh_channel
);
4293 if (x11_init(&c
->u
.x11
.s
, ssh
->cfg
.x11_display
, c
,
4294 ssh
->x11auth
, NULL
, -1, &ssh
->cfg
) != NULL
) {
4295 logevent("Opening X11 forward connection failed");
4297 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4298 PKT_INT
, remoteid
, PKT_END
);
4301 ("Opening X11 forward connection succeeded");
4302 c
->remoteid
= remoteid
;
4303 c
->halfopen
= FALSE
;
4304 c
->localid
= alloc_channel_id(ssh
);
4306 c
->v
.v1
.throttling
= 0;
4307 c
->type
= CHAN_X11
; /* identify channel type */
4308 add234(ssh
->channels
, c
);
4309 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
4310 PKT_INT
, c
->remoteid
, PKT_INT
,
4311 c
->localid
, PKT_END
);
4312 logevent("Opened X11 forward channel");
4317 static void ssh1_smsg_agent_open(Ssh ssh
, struct Packet
*pktin
)
4319 /* Remote side is trying to open a channel to talk to our
4320 * agent. Give them back a local channel number. */
4321 struct ssh_channel
*c
;
4322 int remoteid
= ssh_pkt_getuint32(pktin
);
4324 /* Refuse if agent forwarding is disabled. */
4325 if (!ssh
->agentfwd_enabled
) {
4326 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4327 PKT_INT
, remoteid
, PKT_END
);
4329 c
= snew(struct ssh_channel
);
4331 c
->remoteid
= remoteid
;
4332 c
->halfopen
= FALSE
;
4333 c
->localid
= alloc_channel_id(ssh
);
4335 c
->v
.v1
.throttling
= 0;
4336 c
->type
= CHAN_AGENT
; /* identify channel type */
4337 c
->u
.a
.lensofar
= 0;
4338 add234(ssh
->channels
, c
);
4339 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
4340 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
4345 static void ssh1_msg_port_open(Ssh ssh
, struct Packet
*pktin
)
4347 /* Remote side is trying to open a channel to talk to a
4348 * forwarded port. Give them back a local channel number. */
4349 struct ssh_channel
*c
;
4350 struct ssh_rportfwd pf
, *pfp
;
4355 c
= snew(struct ssh_channel
);
4358 remoteid
= ssh_pkt_getuint32(pktin
);
4359 ssh_pkt_getstring(pktin
, &host
, &hostsize
);
4360 port
= ssh_pkt_getuint32(pktin
);
4362 if (hostsize
>= lenof(pf
.dhost
))
4363 hostsize
= lenof(pf
.dhost
)-1;
4364 memcpy(pf
.dhost
, host
, hostsize
);
4365 pf
.dhost
[hostsize
] = '\0';
4367 pfp
= find234(ssh
->rportfwds
, &pf
, NULL
);
4370 logeventf(ssh
, "Rejected remote port open request for %s:%d",
4372 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4373 PKT_INT
, remoteid
, PKT_END
);
4375 logeventf(ssh
, "Received remote port open request for %s:%d",
4377 e
= pfd_newconnect(&c
->u
.pfd
.s
, pf
.dhost
, port
,
4378 c
, &ssh
->cfg
, pfp
->pfrec
->addressfamily
);
4380 logeventf(ssh
, "Port open failed: %s", e
);
4382 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4383 PKT_INT
, remoteid
, PKT_END
);
4385 c
->remoteid
= remoteid
;
4386 c
->halfopen
= FALSE
;
4387 c
->localid
= alloc_channel_id(ssh
);
4389 c
->v
.v1
.throttling
= 0;
4390 c
->type
= CHAN_SOCKDATA
; /* identify channel type */
4391 add234(ssh
->channels
, c
);
4392 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
4393 PKT_INT
, c
->remoteid
, PKT_INT
,
4394 c
->localid
, PKT_END
);
4395 logevent("Forwarded port opened successfully");
4400 static void ssh1_msg_channel_open_confirmation(Ssh ssh
, struct Packet
*pktin
)
4402 unsigned int remoteid
= ssh_pkt_getuint32(pktin
);
4403 unsigned int localid
= ssh_pkt_getuint32(pktin
);
4404 struct ssh_channel
*c
;
4406 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
4407 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
4408 c
->remoteid
= localid
;
4409 c
->halfopen
= FALSE
;
4410 c
->type
= CHAN_SOCKDATA
;
4411 c
->v
.v1
.throttling
= 0;
4412 pfd_confirm(c
->u
.pfd
.s
);
4415 if (c
&& c
->closes
) {
4417 * We have a pending close on this channel,
4418 * which we decided on before the server acked
4419 * the channel open. So now we know the
4420 * remoteid, we can close it again.
4422 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
,
4423 PKT_INT
, c
->remoteid
, PKT_END
);
4427 static void ssh1_msg_channel_open_failure(Ssh ssh
, struct Packet
*pktin
)
4429 unsigned int remoteid
= ssh_pkt_getuint32(pktin
);
4430 struct ssh_channel
*c
;
4432 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
4433 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
4434 logevent("Forwarded connection refused by server");
4435 pfd_close(c
->u
.pfd
.s
);
4436 del234(ssh
->channels
, c
);
4441 static void ssh1_msg_channel_close(Ssh ssh
, struct Packet
*pktin
)
4443 /* Remote side closes a channel. */
4444 unsigned i
= ssh_pkt_getuint32(pktin
);
4445 struct ssh_channel
*c
;
4446 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
4447 if (c
&& !c
->halfopen
) {
4450 (pktin
->type
== SSH1_MSG_CHANNEL_CLOSE ?
1 : 2);
4452 if ((c
->closes
== 0) && (c
->type
== CHAN_X11
)) {
4453 logevent("Forwarded X11 connection terminated");
4454 assert(c
->u
.x11
.s
!= NULL
);
4455 x11_close(c
->u
.x11
.s
);
4458 if ((c
->closes
== 0) && (c
->type
== CHAN_SOCKDATA
)) {
4459 logevent("Forwarded port closed");
4460 assert(c
->u
.pfd
.s
!= NULL
);
4461 pfd_close(c
->u
.pfd
.s
);
4465 c
->closes
|= (closetype
<< 2); /* seen this message */
4466 if (!(c
->closes
& closetype
)) {
4467 send_packet(ssh
, pktin
->type
, PKT_INT
, c
->remoteid
,
4469 c
->closes
|= closetype
; /* sent it too */
4472 if (c
->closes
== 15) {
4473 del234(ssh
->channels
, c
);
4477 bombout(("Received CHANNEL_CLOSE%s for %s channel %d\n",
4478 pktin
->type
== SSH1_MSG_CHANNEL_CLOSE ?
"" :
4479 "_CONFIRMATION", c ?
"half-open" : "nonexistent",
4484 static void ssh1_msg_channel_data(Ssh ssh
, struct Packet
*pktin
)
4486 /* Data sent down one of our channels. */
4487 int i
= ssh_pkt_getuint32(pktin
);
4490 struct ssh_channel
*c
;
4492 ssh_pkt_getstring(pktin
, &p
, &len
);
4494 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
4499 bufsize
= x11_send(c
->u
.x11
.s
, p
, len
);
4502 bufsize
= pfd_send(c
->u
.pfd
.s
, p
, len
);
4505 /* Data for an agent message. Buffer it. */
4507 if (c
->u
.a
.lensofar
< 4) {
4508 unsigned int l
= min(4 - c
->u
.a
.lensofar
, len
);
4509 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
, p
,
4513 c
->u
.a
.lensofar
+= l
;
4515 if (c
->u
.a
.lensofar
== 4) {
4517 4 + GET_32BIT(c
->u
.a
.msglen
);
4518 c
->u
.a
.message
= snewn(c
->u
.a
.totallen
,
4520 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
4522 if (c
->u
.a
.lensofar
>= 4 && len
> 0) {
4524 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
4526 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
, p
,
4530 c
->u
.a
.lensofar
+= l
;
4532 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
4535 if (agent_query(c
->u
.a
.message
,
4538 ssh_agentf_callback
, c
))
4539 ssh_agentf_callback(c
, reply
, replylen
);
4540 sfree(c
->u
.a
.message
);
4541 c
->u
.a
.lensofar
= 0;
4544 bufsize
= 0; /* agent channels never back up */
4547 if (!c
->v
.v1
.throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
4548 c
->v
.v1
.throttling
= 1;
4549 ssh1_throttle(ssh
, +1);
4554 static void ssh1_smsg_exit_status(Ssh ssh
, struct Packet
*pktin
)
4556 ssh
->exitcode
= ssh_pkt_getuint32(pktin
);
4557 logeventf(ssh
, "Server sent command exit status %d", ssh
->exitcode
);
4558 send_packet(ssh
, SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
4560 * In case `helpful' firewalls or proxies tack
4561 * extra human-readable text on the end of the
4562 * session which we might mistake for another
4563 * encrypted packet, we close the session once
4564 * we've sent EXIT_CONFIRMATION.
4566 ssh
->close_expected
= TRUE
;
4567 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
4570 /* Helper function to deal with sending tty modes for REQUEST_PTY */
4571 static void ssh1_send_ttymode(void *data
, char *mode
, char *val
)
4573 struct Packet
*pktout
= (struct Packet
*)data
;
4575 unsigned int arg
= 0;
4576 while (strcmp(mode
, ssh_ttymodes
[i
].mode
) != 0) i
++;
4577 if (i
== lenof(ssh_ttymodes
)) return;
4578 switch (ssh_ttymodes
[i
].type
) {
4580 arg
= ssh_tty_parse_specchar(val
);
4583 arg
= ssh_tty_parse_boolean(val
);
4586 ssh2_pkt_addbyte(pktout
, ssh_ttymodes
[i
].opcode
);
4587 ssh2_pkt_addbyte(pktout
, arg
);
4591 static void do_ssh1_connection(Ssh ssh
, unsigned char *in
, int inlen
,
4592 struct Packet
*pktin
)
4594 crBegin(ssh
->do_ssh1_connection_crstate
);
4596 ssh
->packet_dispatch
[SSH1_SMSG_STDOUT_DATA
] =
4597 ssh
->packet_dispatch
[SSH1_SMSG_STDERR_DATA
] =
4598 ssh1_smsg_stdout_stderr_data
;
4600 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
] =
4601 ssh1_msg_channel_open_confirmation
;
4602 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_OPEN_FAILURE
] =
4603 ssh1_msg_channel_open_failure
;
4604 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_CLOSE
] =
4605 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
] =
4606 ssh1_msg_channel_close
;
4607 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_DATA
] = ssh1_msg_channel_data
;
4608 ssh
->packet_dispatch
[SSH1_SMSG_EXIT_STATUS
] = ssh1_smsg_exit_status
;
4610 if (ssh
->cfg
.agentfwd
&& agent_exists()) {
4611 logevent("Requesting agent forwarding");
4612 send_packet(ssh
, SSH1_CMSG_AGENT_REQUEST_FORWARDING
, PKT_END
);
4616 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4617 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4618 bombout(("Protocol confusion"));
4620 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4621 logevent("Agent forwarding refused");
4623 logevent("Agent forwarding enabled");
4624 ssh
->agentfwd_enabled
= TRUE
;
4625 ssh
->packet_dispatch
[SSH1_SMSG_AGENT_OPEN
] = ssh1_smsg_agent_open
;
4629 if (ssh
->cfg
.x11_forward
) {
4630 char proto
[20], data
[64];
4631 logevent("Requesting X11 forwarding");
4632 ssh
->x11auth
= x11_invent_auth(proto
, sizeof(proto
),
4633 data
, sizeof(data
), ssh
->cfg
.x11_auth
);
4634 x11_get_real_auth(ssh
->x11auth
, ssh
->cfg
.x11_display
);
4636 * Note that while we blank the X authentication data here, we don't
4637 * take any special action to blank the start of an X11 channel,
4638 * so using MIT-MAGIC-COOKIE-1 and actually opening an X connection
4639 * without having session blanking enabled is likely to leak your
4640 * cookie into the log.
4642 if (ssh
->v1_local_protoflags
& SSH1_PROTOFLAG_SCREEN_NUMBER
) {
4643 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
4645 PKTT_PASSWORD
, PKT_STR
, data
, PKTT_OTHER
,
4646 PKT_INT
, x11_get_screen_number(ssh
->cfg
.x11_display
),
4649 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
4651 PKTT_PASSWORD
, PKT_STR
, data
, PKTT_OTHER
, PKT_END
);
4656 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4657 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4658 bombout(("Protocol confusion"));
4660 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4661 logevent("X11 forwarding refused");
4663 logevent("X11 forwarding enabled");
4664 ssh
->X11_fwd_enabled
= TRUE
;
4665 ssh
->packet_dispatch
[SSH1_SMSG_X11_OPEN
] = ssh1_smsg_x11_open
;
4669 ssh_setup_portfwd(ssh
, &ssh
->cfg
);
4670 ssh
->packet_dispatch
[SSH1_MSG_PORT_OPEN
] = ssh1_msg_port_open
;
4672 if (!ssh
->cfg
.nopty
) {
4674 /* Unpick the terminal-speed string. */
4675 /* XXX perhaps we should allow no speeds to be sent. */
4676 ssh
->ospeed
= 38400; ssh
->ispeed
= 38400; /* last-resort defaults */
4677 sscanf(ssh
->cfg
.termspeed
, "%d,%d", &ssh
->ospeed
, &ssh
->ispeed
);
4678 /* Send the pty request. */
4679 pkt
= ssh1_pkt_init(SSH1_CMSG_REQUEST_PTY
);
4680 ssh_pkt_addstring(pkt
, ssh
->cfg
.termtype
);
4681 ssh_pkt_adduint32(pkt
, ssh
->term_height
);
4682 ssh_pkt_adduint32(pkt
, ssh
->term_width
);
4683 ssh_pkt_adduint32(pkt
, 0); /* width in pixels */
4684 ssh_pkt_adduint32(pkt
, 0); /* height in pixels */
4685 parse_ttymodes(ssh
, ssh
->cfg
.ttymodes
,
4686 ssh1_send_ttymode
, (void *)pkt
);
4687 ssh_pkt_addbyte(pkt
, SSH1_TTY_OP_ISPEED
);
4688 ssh_pkt_adduint32(pkt
, ssh
->ispeed
);
4689 ssh_pkt_addbyte(pkt
, SSH1_TTY_OP_OSPEED
);
4690 ssh_pkt_adduint32(pkt
, ssh
->ospeed
);
4691 ssh_pkt_addbyte(pkt
, SSH_TTY_OP_END
);
4693 ssh
->state
= SSH_STATE_INTERMED
;
4697 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4698 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4699 bombout(("Protocol confusion"));
4701 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4702 c_write_str(ssh
, "Server refused to allocate pty\r\n");
4703 ssh
->editing
= ssh
->echoing
= 1;
4705 logeventf(ssh
, "Allocated pty (ospeed %dbps, ispeed %dbps)",
4706 ssh
->ospeed
, ssh
->ispeed
);
4708 ssh
->editing
= ssh
->echoing
= 1;
4711 if (ssh
->cfg
.compression
) {
4712 send_packet(ssh
, SSH1_CMSG_REQUEST_COMPRESSION
, PKT_INT
, 6, PKT_END
);
4716 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4717 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4718 bombout(("Protocol confusion"));
4720 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4721 c_write_str(ssh
, "Server refused to compress\r\n");
4723 logevent("Started compression");
4724 ssh
->v1_compressing
= TRUE
;
4725 ssh
->cs_comp_ctx
= zlib_compress_init();
4726 logevent("Initialised zlib (RFC1950) compression");
4727 ssh
->sc_comp_ctx
= zlib_decompress_init();
4728 logevent("Initialised zlib (RFC1950) decompression");
4732 * Start the shell or command.
4734 * Special case: if the first-choice command is an SSH-2
4735 * subsystem (hence not usable here) and the second choice
4736 * exists, we fall straight back to that.
4739 char *cmd
= ssh
->cfg
.remote_cmd_ptr
;
4741 if (!cmd
) cmd
= ssh
->cfg
.remote_cmd
;
4743 if (ssh
->cfg
.ssh_subsys
&& ssh
->cfg
.remote_cmd_ptr2
) {
4744 cmd
= ssh
->cfg
.remote_cmd_ptr2
;
4745 ssh
->fallback_cmd
= TRUE
;
4748 send_packet(ssh
, SSH1_CMSG_EXEC_CMD
, PKT_STR
, cmd
, PKT_END
);
4750 send_packet(ssh
, SSH1_CMSG_EXEC_SHELL
, PKT_END
);
4751 logevent("Started session");
4754 ssh
->state
= SSH_STATE_SESSION
;
4755 if (ssh
->size_needed
)
4756 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
4757 if (ssh
->eof_needed
)
4758 ssh_special(ssh
, TS_EOF
);
4761 ldisc_send(ssh
->ldisc
, NULL
, 0, 0);/* cause ldisc to notice changes */
4763 ssh
->channels
= newtree234(ssh_channelcmp
);
4767 * By this point, most incoming packets are already being
4768 * handled by the dispatch table, and we need only pay
4769 * attention to the unusual ones.
4774 if (pktin
->type
== SSH1_SMSG_SUCCESS
) {
4775 /* may be from EXEC_SHELL on some servers */
4776 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4777 /* may be from EXEC_SHELL on some servers
4778 * if no pty is available or in other odd cases. Ignore */
4780 bombout(("Strange packet received: type %d", pktin
->type
));
4785 int len
= min(inlen
, 512);
4786 send_packet(ssh
, SSH1_CMSG_STDIN_DATA
, PKTT_DATA
,
4787 PKT_INT
, len
, PKT_DATA
, in
, len
,
4788 PKTT_OTHER
, PKT_END
);
4799 * Handle the top-level SSH-2 protocol.
4801 static void ssh1_msg_debug(Ssh ssh
, struct Packet
*pktin
)
4806 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
4807 logeventf(ssh
, "Remote debug message: %.*s", msglen
, msg
);
4810 static void ssh1_msg_disconnect(Ssh ssh
, struct Packet
*pktin
)
4812 /* log reason code in disconnect message */
4816 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
4817 bombout(("Server sent disconnect message:\n\"%.*s\"", msglen
, msg
));
4820 static void ssh_msg_ignore(Ssh ssh
, struct Packet
*pktin
)
4822 /* Do nothing, because we're ignoring it! Duhh. */
4825 static void ssh1_protocol_setup(Ssh ssh
)
4830 * Most messages are handled by the coroutines.
4832 for (i
= 0; i
< 256; i
++)
4833 ssh
->packet_dispatch
[i
] = NULL
;
4836 * These special message types we install handlers for.
4838 ssh
->packet_dispatch
[SSH1_MSG_DISCONNECT
] = ssh1_msg_disconnect
;
4839 ssh
->packet_dispatch
[SSH1_MSG_IGNORE
] = ssh_msg_ignore
;
4840 ssh
->packet_dispatch
[SSH1_MSG_DEBUG
] = ssh1_msg_debug
;
4843 static void ssh1_protocol(Ssh ssh
, void *vin
, int inlen
,
4844 struct Packet
*pktin
)
4846 unsigned char *in
=(unsigned char*)vin
;
4847 if (ssh
->state
== SSH_STATE_CLOSED
)
4850 if (pktin
&& ssh
->packet_dispatch
[pktin
->type
]) {
4851 ssh
->packet_dispatch
[pktin
->type
](ssh
, pktin
);
4855 if (!ssh
->protocol_initial_phase_done
) {
4856 if (do_ssh1_login(ssh
, in
, inlen
, pktin
))
4857 ssh
->protocol_initial_phase_done
= TRUE
;
4862 do_ssh1_connection(ssh
, in
, inlen
, pktin
);
4866 * Utility routine for decoding comma-separated strings in KEXINIT.
4868 static int in_commasep_string(char *needle
, char *haystack
, int haylen
)
4871 if (!needle
|| !haystack
) /* protect against null pointers */
4873 needlen
= strlen(needle
);
4876 * Is it at the start of the string?
4878 if (haylen
>= needlen
&& /* haystack is long enough */
4879 !memcmp(needle
, haystack
, needlen
) && /* initial match */
4880 (haylen
== needlen
|| haystack
[needlen
] == ',')
4881 /* either , or EOS follows */
4885 * If not, search for the next comma and resume after that.
4886 * If no comma found, terminate.
4888 while (haylen
> 0 && *haystack
!= ',')
4889 haylen
--, haystack
++;
4892 haylen
--, haystack
++; /* skip over comma itself */
4897 * Similar routine for checking whether we have the first string in a list.
4899 static int first_in_commasep_string(char *needle
, char *haystack
, int haylen
)
4902 if (!needle
|| !haystack
) /* protect against null pointers */
4904 needlen
= strlen(needle
);
4906 * Is it at the start of the string?
4908 if (haylen
>= needlen
&& /* haystack is long enough */
4909 !memcmp(needle
, haystack
, needlen
) && /* initial match */
4910 (haylen
== needlen
|| haystack
[needlen
] == ',')
4911 /* either , or EOS follows */
4919 * SSH-2 key creation method.
4921 static void ssh2_mkkey(Ssh ssh
, Bignum K
, unsigned char *H
,
4922 unsigned char *sessid
, char chr
,
4923 unsigned char *keyspace
)
4926 /* First 20 bytes. */
4928 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
4930 SHA_Bytes(&s
, H
, 20);
4931 SHA_Bytes(&s
, &chr
, 1);
4932 SHA_Bytes(&s
, sessid
, 20);
4933 SHA_Final(&s
, keyspace
);
4934 /* Next 20 bytes. */
4936 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
4938 SHA_Bytes(&s
, H
, 20);
4939 SHA_Bytes(&s
, keyspace
, 20);
4940 SHA_Final(&s
, keyspace
+ 20);
4944 * Handle the SSH-2 transport layer.
4946 static int do_ssh2_transport(Ssh ssh
, void *vin
, int inlen
,
4947 struct Packet
*pktin
)
4949 unsigned char *in
= (unsigned char *)vin
;
4950 struct do_ssh2_transport_state
{
4951 int nbits
, pbits
, warn_kex
, warn_cscipher
, warn_sccipher
;
4952 Bignum p
, g
, e
, f
, K
;
4953 int kex_init_value
, kex_reply_value
;
4954 const struct ssh_mac
**maclist
;
4956 const struct ssh2_cipher
*cscipher_tobe
;
4957 const struct ssh2_cipher
*sccipher_tobe
;
4958 const struct ssh_mac
*csmac_tobe
;
4959 const struct ssh_mac
*scmac_tobe
;
4960 const struct ssh_compress
*cscomp_tobe
;
4961 const struct ssh_compress
*sccomp_tobe
;
4962 char *hostkeydata
, *sigdata
, *keystr
, *fingerprint
;
4963 int hostkeylen
, siglen
;
4964 void *hkey
; /* actual host key */
4965 unsigned char exchange_hash
[20];
4966 int n_preferred_kex
;
4967 const struct ssh_kex
*preferred_kex
[KEX_MAX
];
4968 int n_preferred_ciphers
;
4969 const struct ssh2_ciphers
*preferred_ciphers
[CIPHER_MAX
];
4970 const struct ssh_compress
*preferred_comp
;
4971 int got_session_id
, activated_authconn
;
4972 struct Packet
*pktout
;
4977 crState(do_ssh2_transport_state
);
4979 crBegin(ssh
->do_ssh2_transport_crstate
);
4981 s
->cscipher_tobe
= s
->sccipher_tobe
= NULL
;
4982 s
->csmac_tobe
= s
->scmac_tobe
= NULL
;
4983 s
->cscomp_tobe
= s
->sccomp_tobe
= NULL
;
4985 s
->got_session_id
= s
->activated_authconn
= FALSE
;
4988 * Be prepared to work around the buggy MAC problem.
4990 if (ssh
->remote_bugs
& BUG_SSH2_HMAC
)
4991 s
->maclist
= buggymacs
, s
->nmacs
= lenof(buggymacs
);
4993 s
->maclist
= macs
, s
->nmacs
= lenof(macs
);
4996 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_KEX_MASK
;
4998 int i
, j
, commalist_started
;
5001 * Set up the preferred key exchange. (NULL => warn below here)
5003 s
->n_preferred_kex
= 0;
5004 for (i
= 0; i
< KEX_MAX
; i
++) {
5005 switch (ssh
->cfg
.ssh_kexlist
[i
]) {
5007 s
->preferred_kex
[s
->n_preferred_kex
++] =
5008 &ssh_diffiehellman_gex
;
5011 s
->preferred_kex
[s
->n_preferred_kex
++] =
5012 &ssh_diffiehellman_group14
;
5015 s
->preferred_kex
[s
->n_preferred_kex
++] =
5016 &ssh_diffiehellman_group1
;
5019 /* Flag for later. Don't bother if it's the last in
5021 if (i
< KEX_MAX
- 1) {
5022 s
->preferred_kex
[s
->n_preferred_kex
++] = NULL
;
5029 * Set up the preferred ciphers. (NULL => warn below here)
5031 s
->n_preferred_ciphers
= 0;
5032 for (i
= 0; i
< CIPHER_MAX
; i
++) {
5033 switch (ssh
->cfg
.ssh_cipherlist
[i
]) {
5034 case CIPHER_BLOWFISH
:
5035 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_blowfish
;
5038 if (ssh
->cfg
.ssh2_des_cbc
) {
5039 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_des
;
5043 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_3des
;
5046 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_aes
;
5048 case CIPHER_ARCFOUR
:
5049 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_arcfour
;
5052 /* Flag for later. Don't bother if it's the last in
5054 if (i
< CIPHER_MAX
- 1) {
5055 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = NULL
;
5062 * Set up preferred compression.
5064 if (ssh
->cfg
.compression
)
5065 s
->preferred_comp
= &ssh_zlib
;
5067 s
->preferred_comp
= &ssh_comp_none
;
5070 * Enable queueing of outgoing auth- or connection-layer
5071 * packets while we are in the middle of a key exchange.
5073 ssh
->queueing
= TRUE
;
5076 * Flag that KEX is in progress.
5078 ssh
->kex_in_progress
= TRUE
;
5081 * Construct and send our key exchange packet.
5083 s
->pktout
= ssh2_pkt_init(SSH2_MSG_KEXINIT
);
5084 for (i
= 0; i
< 16; i
++)
5085 ssh2_pkt_addbyte(s
->pktout
, (unsigned char) random_byte());
5086 /* List key exchange algorithms. */
5087 ssh2_pkt_addstring_start(s
->pktout
);
5088 commalist_started
= 0;
5089 for (i
= 0; i
< s
->n_preferred_kex
; i
++) {
5090 const struct ssh_kex
*k
= s
->preferred_kex
[i
];
5091 if (!k
) continue; /* warning flag */
5092 if (commalist_started
)
5093 ssh2_pkt_addstring_str(s
->pktout
, ",");
5094 ssh2_pkt_addstring_str(s
->pktout
, s
->preferred_kex
[i
]->name
);
5095 commalist_started
= 1;
5097 /* List server host key algorithms. */
5098 ssh2_pkt_addstring_start(s
->pktout
);
5099 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
5100 ssh2_pkt_addstring_str(s
->pktout
, hostkey_algs
[i
]->name
);
5101 if (i
< lenof(hostkey_algs
) - 1)
5102 ssh2_pkt_addstring_str(s
->pktout
, ",");
5104 /* List client->server encryption algorithms. */
5105 ssh2_pkt_addstring_start(s
->pktout
);
5106 commalist_started
= 0;
5107 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
5108 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
5109 if (!c
) continue; /* warning flag */
5110 for (j
= 0; j
< c
->nciphers
; j
++) {
5111 if (commalist_started
)
5112 ssh2_pkt_addstring_str(s
->pktout
, ",");
5113 ssh2_pkt_addstring_str(s
->pktout
, c
->list
[j
]->name
);
5114 commalist_started
= 1;
5117 /* List server->client encryption algorithms. */
5118 ssh2_pkt_addstring_start(s
->pktout
);
5119 commalist_started
= 0;
5120 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
5121 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
5122 if (!c
) continue; /* warning flag */
5123 for (j
= 0; j
< c
->nciphers
; j
++) {
5124 if (commalist_started
)
5125 ssh2_pkt_addstring_str(s
->pktout
, ",");
5126 ssh2_pkt_addstring_str(s
->pktout
, c
->list
[j
]->name
);
5127 commalist_started
= 1;
5130 /* List client->server MAC algorithms. */
5131 ssh2_pkt_addstring_start(s
->pktout
);
5132 for (i
= 0; i
< s
->nmacs
; i
++) {
5133 ssh2_pkt_addstring_str(s
->pktout
, s
->maclist
[i
]->name
);
5134 if (i
< s
->nmacs
- 1)
5135 ssh2_pkt_addstring_str(s
->pktout
, ",");
5137 /* List server->client MAC algorithms. */
5138 ssh2_pkt_addstring_start(s
->pktout
);
5139 for (i
= 0; i
< s
->nmacs
; i
++) {
5140 ssh2_pkt_addstring_str(s
->pktout
, s
->maclist
[i
]->name
);
5141 if (i
< s
->nmacs
- 1)
5142 ssh2_pkt_addstring_str(s
->pktout
, ",");
5144 /* List client->server compression algorithms. */
5145 ssh2_pkt_addstring_start(s
->pktout
);
5146 assert(lenof(compressions
) > 1);
5147 ssh2_pkt_addstring_str(s
->pktout
, s
->preferred_comp
->name
);
5148 for (i
= 0; i
< lenof(compressions
); i
++) {
5149 const struct ssh_compress
*c
= compressions
[i
];
5150 if (c
!= s
->preferred_comp
) {
5151 ssh2_pkt_addstring_str(s
->pktout
, ",");
5152 ssh2_pkt_addstring_str(s
->pktout
, c
->name
);
5155 /* List server->client compression algorithms. */
5156 ssh2_pkt_addstring_start(s
->pktout
);
5157 assert(lenof(compressions
) > 1);
5158 ssh2_pkt_addstring_str(s
->pktout
, s
->preferred_comp
->name
);
5159 for (i
= 0; i
< lenof(compressions
); i
++) {
5160 const struct ssh_compress
*c
= compressions
[i
];
5161 if (c
!= s
->preferred_comp
) {
5162 ssh2_pkt_addstring_str(s
->pktout
, ",");
5163 ssh2_pkt_addstring_str(s
->pktout
, c
->name
);
5166 /* List client->server languages. Empty list. */
5167 ssh2_pkt_addstring_start(s
->pktout
);
5168 /* List server->client languages. Empty list. */
5169 ssh2_pkt_addstring_start(s
->pktout
);
5170 /* First KEX packet does _not_ follow, because we're not that brave. */
5171 ssh2_pkt_addbool(s
->pktout
, FALSE
);
5173 ssh2_pkt_adduint32(s
->pktout
, 0);
5176 ssh
->exhash
= ssh
->exhashbase
;
5177 sha_string(&ssh
->exhash
, s
->pktout
->data
+ 5, s
->pktout
->length
- 5);
5179 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5183 if (pktin
->length
> 5)
5184 sha_string(&ssh
->exhash
, pktin
->data
+ 5, pktin
->length
- 5);
5187 * Now examine the other side's KEXINIT to see what we're up
5191 char *str
, *preferred
;
5194 if (pktin
->type
!= SSH2_MSG_KEXINIT
) {
5195 bombout(("expected key exchange packet from server"));
5199 ssh
->hostkey
= NULL
;
5200 s
->cscipher_tobe
= NULL
;
5201 s
->sccipher_tobe
= NULL
;
5202 s
->csmac_tobe
= NULL
;
5203 s
->scmac_tobe
= NULL
;
5204 s
->cscomp_tobe
= NULL
;
5205 s
->sccomp_tobe
= NULL
;
5206 s
->warn_kex
= s
->warn_cscipher
= s
->warn_sccipher
= FALSE
;
5208 pktin
->savedpos
+= 16; /* skip garbage cookie */
5209 ssh_pkt_getstring(pktin
, &str
, &len
); /* key exchange algorithms */
5212 for (i
= 0; i
< s
->n_preferred_kex
; i
++) {
5213 const struct ssh_kex
*k
= s
->preferred_kex
[i
];
5217 if (!preferred
) preferred
= k
->name
;
5218 if (in_commasep_string(k
->name
, str
, len
))
5225 bombout(("Couldn't agree a key exchange algorithm (available: %s)",
5226 str ? str
: "(null)"));
5230 * Note that the server's guess is considered wrong if it doesn't match
5231 * the first algorithm in our list, even if it's still the algorithm
5234 s
->guessok
= first_in_commasep_string(preferred
, str
, len
);
5235 ssh_pkt_getstring(pktin
, &str
, &len
); /* host key algorithms */
5236 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
5237 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
5238 ssh
->hostkey
= hostkey_algs
[i
];
5242 s
->guessok
= s
->guessok
&&
5243 first_in_commasep_string(hostkey_algs
[0]->name
, str
, len
);
5244 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server cipher */
5245 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
5246 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
5248 s
->warn_cscipher
= TRUE
;
5250 for (j
= 0; j
< c
->nciphers
; j
++) {
5251 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
5252 s
->cscipher_tobe
= c
->list
[j
];
5257 if (s
->cscipher_tobe
)
5260 if (!s
->cscipher_tobe
) {
5261 bombout(("Couldn't agree a client-to-server cipher (available: %s)",
5262 str ? str
: "(null)"));
5266 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client cipher */
5267 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
5268 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
5270 s
->warn_sccipher
= TRUE
;
5272 for (j
= 0; j
< c
->nciphers
; j
++) {
5273 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
5274 s
->sccipher_tobe
= c
->list
[j
];
5279 if (s
->sccipher_tobe
)
5282 if (!s
->sccipher_tobe
) {
5283 bombout(("Couldn't agree a server-to-client cipher (available: %s)",
5284 str ? str
: "(null)"));
5288 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server mac */
5289 for (i
= 0; i
< s
->nmacs
; i
++) {
5290 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
5291 s
->csmac_tobe
= s
->maclist
[i
];
5295 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client mac */
5296 for (i
= 0; i
< s
->nmacs
; i
++) {
5297 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
5298 s
->scmac_tobe
= s
->maclist
[i
];
5302 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server compression */
5303 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
5304 const struct ssh_compress
*c
=
5305 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
5306 if (in_commasep_string(c
->name
, str
, len
)) {
5311 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client compression */
5312 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
5313 const struct ssh_compress
*c
=
5314 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
5315 if (in_commasep_string(c
->name
, str
, len
)) {
5320 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server language */
5321 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client language */
5322 s
->ignorepkt
= ssh2_pkt_getbool(pktin
) && !s
->guessok
;
5325 ssh_set_frozen(ssh
, 1);
5326 s
->dlgret
= askalg(ssh
->frontend
, "key-exchange algorithm",
5328 ssh_dialog_callback
, ssh
);
5329 if (s
->dlgret
< 0) {
5333 bombout(("Unexpected data from server while"
5334 " waiting for user response"));
5337 } while (pktin
|| inlen
> 0);
5338 s
->dlgret
= ssh
->user_response
;
5340 ssh_set_frozen(ssh
, 0);
5341 if (s
->dlgret
== 0) {
5342 ssh
->close_expected
= TRUE
;
5343 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5348 if (s
->warn_cscipher
) {
5349 ssh_set_frozen(ssh
, 1);
5350 s
->dlgret
= askalg(ssh
->frontend
,
5351 "client-to-server cipher",
5352 s
->cscipher_tobe
->name
,
5353 ssh_dialog_callback
, ssh
);
5354 if (s
->dlgret
< 0) {
5358 bombout(("Unexpected data from server while"
5359 " waiting for user response"));
5362 } while (pktin
|| inlen
> 0);
5363 s
->dlgret
= ssh
->user_response
;
5365 ssh_set_frozen(ssh
, 0);
5366 if (s
->dlgret
== 0) {
5367 ssh
->close_expected
= TRUE
;
5368 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5373 if (s
->warn_sccipher
) {
5374 ssh_set_frozen(ssh
, 1);
5375 s
->dlgret
= askalg(ssh
->frontend
,
5376 "server-to-client cipher",
5377 s
->sccipher_tobe
->name
,
5378 ssh_dialog_callback
, ssh
);
5379 if (s
->dlgret
< 0) {
5383 bombout(("Unexpected data from server while"
5384 " waiting for user response"));
5387 } while (pktin
|| inlen
> 0);
5388 s
->dlgret
= ssh
->user_response
;
5390 ssh_set_frozen(ssh
, 0);
5391 if (s
->dlgret
== 0) {
5392 ssh
->close_expected
= TRUE
;
5393 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5398 if (s
->ignorepkt
) /* first_kex_packet_follows */
5399 crWaitUntil(pktin
); /* Ignore packet */
5403 * Work out the number of bits of key we will need from the key
5404 * exchange. We start with the maximum key length of either
5410 csbits
= s
->cscipher_tobe
->keylen
;
5411 scbits
= s
->sccipher_tobe
->keylen
;
5412 s
->nbits
= (csbits
> scbits ? csbits
: scbits
);
5414 /* The keys only have 160-bit entropy, since they're based on
5415 * a SHA-1 hash. So cap the key size at 160 bits. */
5420 * If we're doing Diffie-Hellman group exchange, start by
5421 * requesting a group.
5423 if (!ssh
->kex
->pdata
) {
5424 logevent("Doing Diffie-Hellman group exchange");
5425 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGEX
;
5427 * Work out how big a DH group we will need to allow that
5430 s
->pbits
= 512 << ((s
->nbits
- 1) / 64);
5431 s
->pktout
= ssh2_pkt_init(SSH2_MSG_KEX_DH_GEX_REQUEST
);
5432 ssh2_pkt_adduint32(s
->pktout
, s
->pbits
);
5433 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5436 if (pktin
->type
!= SSH2_MSG_KEX_DH_GEX_GROUP
) {
5437 bombout(("expected key exchange group packet from server"));
5440 s
->p
= ssh2_pkt_getmp(pktin
);
5441 s
->g
= ssh2_pkt_getmp(pktin
);
5442 if (!s
->p
|| !s
->g
) {
5443 bombout(("unable to read mp-ints from incoming group packet"));
5446 ssh
->kex_ctx
= dh_setup_gex(s
->p
, s
->g
);
5447 s
->kex_init_value
= SSH2_MSG_KEX_DH_GEX_INIT
;
5448 s
->kex_reply_value
= SSH2_MSG_KEX_DH_GEX_REPLY
;
5450 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGROUP
;
5451 ssh
->kex_ctx
= dh_setup_group(ssh
->kex
);
5452 s
->kex_init_value
= SSH2_MSG_KEXDH_INIT
;
5453 s
->kex_reply_value
= SSH2_MSG_KEXDH_REPLY
;
5454 logeventf(ssh
, "Using Diffie-Hellman with standard group \"%s\"",
5455 ssh
->kex
->groupname
);
5458 logevent("Doing Diffie-Hellman key exchange");
5460 * Now generate and send e for Diffie-Hellman.
5462 set_busy_status(ssh
->frontend
, BUSY_CPU
); /* this can take a while */
5463 s
->e
= dh_create_e(ssh
->kex_ctx
, s
->nbits
* 2);
5464 s
->pktout
= ssh2_pkt_init(s
->kex_init_value
);
5465 ssh2_pkt_addmp(s
->pktout
, s
->e
);
5466 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5468 set_busy_status(ssh
->frontend
, BUSY_WAITING
); /* wait for server */
5470 if (pktin
->type
!= s
->kex_reply_value
) {
5471 bombout(("expected key exchange reply packet from server"));
5474 set_busy_status(ssh
->frontend
, BUSY_CPU
); /* cogitate */
5475 ssh_pkt_getstring(pktin
, &s
->hostkeydata
, &s
->hostkeylen
);
5476 s
->f
= ssh2_pkt_getmp(pktin
);
5478 bombout(("unable to parse key exchange reply packet"));
5481 ssh_pkt_getstring(pktin
, &s
->sigdata
, &s
->siglen
);
5483 s
->K
= dh_find_K(ssh
->kex_ctx
, s
->f
);
5485 /* We assume everything from now on will be quick, and it might
5486 * involve user interaction. */
5487 set_busy_status(ssh
->frontend
, BUSY_NOT
);
5489 sha_string(&ssh
->exhash
, s
->hostkeydata
, s
->hostkeylen
);
5490 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
5491 sha_uint32(&ssh
->exhash
, s
->pbits
);
5492 sha_mpint(&ssh
->exhash
, s
->p
);
5493 sha_mpint(&ssh
->exhash
, s
->g
);
5495 sha_mpint(&ssh
->exhash
, s
->e
);
5496 sha_mpint(&ssh
->exhash
, s
->f
);
5497 sha_mpint(&ssh
->exhash
, s
->K
);
5498 SHA_Final(&ssh
->exhash
, s
->exchange_hash
);
5500 dh_cleanup(ssh
->kex_ctx
);
5501 ssh
->kex_ctx
= NULL
;
5504 debug(("Exchange hash is:\n"));
5505 dmemdump(s
->exchange_hash
, 20);
5508 s
->hkey
= ssh
->hostkey
->newkey(s
->hostkeydata
, s
->hostkeylen
);
5510 !ssh
->hostkey
->verifysig(s
->hkey
, s
->sigdata
, s
->siglen
,
5511 (char *)s
->exchange_hash
, 20)) {
5512 bombout(("Server's host key did not match the signature supplied"));
5517 * Authenticate remote host: verify host key. (We've already
5518 * checked the signature of the exchange hash.)
5520 s
->keystr
= ssh
->hostkey
->fmtkey(s
->hkey
);
5521 s
->fingerprint
= ssh
->hostkey
->fingerprint(s
->hkey
);
5522 ssh_set_frozen(ssh
, 1);
5523 s
->dlgret
= verify_ssh_host_key(ssh
->frontend
,
5524 ssh
->savedhost
, ssh
->savedport
,
5525 ssh
->hostkey
->keytype
, s
->keystr
,
5527 ssh_dialog_callback
, ssh
);
5528 if (s
->dlgret
< 0) {
5532 bombout(("Unexpected data from server while waiting"
5533 " for user host key response"));
5536 } while (pktin
|| inlen
> 0);
5537 s
->dlgret
= ssh
->user_response
;
5539 ssh_set_frozen(ssh
, 0);
5540 if (s
->dlgret
== 0) {
5541 ssh
->close_expected
= TRUE
;
5542 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5545 if (!s
->got_session_id
) { /* don't bother logging this in rekeys */
5546 logevent("Host key fingerprint is:");
5547 logevent(s
->fingerprint
);
5549 sfree(s
->fingerprint
);
5551 ssh
->hostkey
->freekey(s
->hkey
);
5554 * The exchange hash from the very first key exchange is also
5555 * the session id, used in session key construction and
5558 if (!s
->got_session_id
) {
5559 memcpy(ssh
->v2_session_id
, s
->exchange_hash
,
5560 sizeof(s
->exchange_hash
));
5561 s
->got_session_id
= TRUE
;
5565 * Send SSH2_MSG_NEWKEYS.
5567 s
->pktout
= ssh2_pkt_init(SSH2_MSG_NEWKEYS
);
5568 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5569 ssh
->outgoing_data_size
= 0; /* start counting from here */
5572 * We've sent client NEWKEYS, so create and initialise
5573 * client-to-server session keys.
5575 if (ssh
->cs_cipher_ctx
)
5576 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
5577 ssh
->cscipher
= s
->cscipher_tobe
;
5578 ssh
->cs_cipher_ctx
= ssh
->cscipher
->make_context();
5580 if (ssh
->cs_mac_ctx
)
5581 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
5582 ssh
->csmac
= s
->csmac_tobe
;
5583 ssh
->cs_mac_ctx
= ssh
->csmac
->make_context();
5585 if (ssh
->cs_comp_ctx
)
5586 ssh
->cscomp
->compress_cleanup(ssh
->cs_comp_ctx
);
5587 ssh
->cscomp
= s
->cscomp_tobe
;
5588 ssh
->cs_comp_ctx
= ssh
->cscomp
->compress_init();
5591 * Set IVs on client-to-server keys. Here we use the exchange
5592 * hash from the _first_ key exchange.
5595 unsigned char keyspace
[40];
5596 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'C',keyspace
);
5597 ssh
->cscipher
->setkey(ssh
->cs_cipher_ctx
, keyspace
);
5598 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'A',keyspace
);
5599 ssh
->cscipher
->setiv(ssh
->cs_cipher_ctx
, keyspace
);
5600 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'E',keyspace
);
5601 ssh
->csmac
->setkey(ssh
->cs_mac_ctx
, keyspace
);
5604 logeventf(ssh
, "Initialised %.200s client->server encryption",
5605 ssh
->cscipher
->text_name
);
5606 logeventf(ssh
, "Initialised %.200s client->server MAC algorithm",
5607 ssh
->csmac
->text_name
);
5608 if (ssh
->cscomp
->text_name
)
5609 logeventf(ssh
, "Initialised %s compression",
5610 ssh
->cscomp
->text_name
);
5613 * Now our end of the key exchange is complete, we can send all
5614 * our queued higher-layer packets.
5616 ssh
->queueing
= FALSE
;
5617 ssh2_pkt_queuesend(ssh
);
5620 * Expect SSH2_MSG_NEWKEYS from server.
5623 if (pktin
->type
!= SSH2_MSG_NEWKEYS
) {
5624 bombout(("expected new-keys packet from server"));
5627 ssh
->incoming_data_size
= 0; /* start counting from here */
5630 * We've seen server NEWKEYS, so create and initialise
5631 * server-to-client session keys.
5633 if (ssh
->sc_cipher_ctx
)
5634 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
5635 ssh
->sccipher
= s
->sccipher_tobe
;
5636 ssh
->sc_cipher_ctx
= ssh
->sccipher
->make_context();
5638 if (ssh
->sc_mac_ctx
)
5639 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
5640 ssh
->scmac
= s
->scmac_tobe
;
5641 ssh
->sc_mac_ctx
= ssh
->scmac
->make_context();
5643 if (ssh
->sc_comp_ctx
)
5644 ssh
->sccomp
->decompress_cleanup(ssh
->sc_comp_ctx
);
5645 ssh
->sccomp
= s
->sccomp_tobe
;
5646 ssh
->sc_comp_ctx
= ssh
->sccomp
->decompress_init();
5649 * Set IVs on server-to-client keys. Here we use the exchange
5650 * hash from the _first_ key exchange.
5653 unsigned char keyspace
[40];
5654 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'D',keyspace
);
5655 ssh
->sccipher
->setkey(ssh
->sc_cipher_ctx
, keyspace
);
5656 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'B',keyspace
);
5657 ssh
->sccipher
->setiv(ssh
->sc_cipher_ctx
, keyspace
);
5658 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'F',keyspace
);
5659 ssh
->scmac
->setkey(ssh
->sc_mac_ctx
, keyspace
);
5661 logeventf(ssh
, "Initialised %.200s server->client encryption",
5662 ssh
->sccipher
->text_name
);
5663 logeventf(ssh
, "Initialised %.200s server->client MAC algorithm",
5664 ssh
->scmac
->text_name
);
5665 if (ssh
->sccomp
->text_name
)
5666 logeventf(ssh
, "Initialised %s decompression",
5667 ssh
->sccomp
->text_name
);
5670 * Free key exchange data.
5674 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
5680 * Key exchange is over. Loop straight back round if we have a
5681 * deferred rekey reason.
5683 if (ssh
->deferred_rekey_reason
) {
5684 logevent(ssh
->deferred_rekey_reason
);
5686 ssh
->deferred_rekey_reason
= NULL
;
5687 goto begin_key_exchange
;
5691 * Otherwise, schedule a timer for our next rekey.
5693 ssh
->kex_in_progress
= FALSE
;
5694 ssh
->last_rekey
= GETTICKCOUNT();
5695 if (ssh
->cfg
.ssh_rekey_time
!= 0)
5696 ssh
->next_rekey
= schedule_timer(ssh
->cfg
.ssh_rekey_time
*60*TICKSPERSEC
,
5700 * If this is the first key exchange phase, we must pass the
5701 * SSH2_MSG_NEWKEYS packet to the next layer, not because it
5702 * wants to see it but because it will need time to initialise
5703 * itself before it sees an actual packet. In subsequent key
5704 * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because
5705 * it would only confuse the layer above.
5707 if (s
->activated_authconn
) {
5710 s
->activated_authconn
= TRUE
;
5713 * Now we're encrypting. Begin returning 1 to the protocol main
5714 * function so that other things can run on top of the
5715 * transport. If we ever see a KEXINIT, we must go back to the
5718 * We _also_ go back to the start if we see pktin==NULL and
5719 * inlen==-1, because this is a special signal meaning
5720 * `initiate client-driven rekey', and `in' contains a message
5721 * giving the reason for the rekey.
5723 while (!((pktin
&& pktin
->type
== SSH2_MSG_KEXINIT
) ||
5724 (!pktin
&& inlen
== -1))) {
5729 logevent("Server initiated key re-exchange");
5732 * Special case: if the server bug is set that doesn't
5733 * allow rekeying, we give a different log message and
5734 * continue waiting. (If such a server _initiates_ a rekey,
5735 * we process it anyway!)
5737 if ((ssh
->remote_bugs
& BUG_SSH2_REKEY
)) {
5738 logeventf(ssh
, "Server bug prevents key re-exchange (%s)",
5740 /* Reset the counters, so that at least this message doesn't
5741 * hit the event log _too_ often. */
5742 ssh
->outgoing_data_size
= 0;
5743 ssh
->incoming_data_size
= 0;
5744 if (ssh
->cfg
.ssh_rekey_time
!= 0) {
5746 schedule_timer(ssh
->cfg
.ssh_rekey_time
*60*TICKSPERSEC
,
5749 goto wait_for_rekey
; /* this is utterly horrid */
5751 logeventf(ssh
, "Initiating key re-exchange (%s)", (char *)in
);
5754 goto begin_key_exchange
;
5760 * Add data to an SSH-2 channel output buffer.
5762 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
,
5765 bufchain_add(&c
->v
.v2
.outbuffer
, buf
, len
);
5769 * Attempt to send data on an SSH-2 channel.
5771 static int ssh2_try_send(struct ssh_channel
*c
)
5774 struct Packet
*pktout
;
5776 while (c
->v
.v2
.remwindow
> 0 && bufchain_size(&c
->v
.v2
.outbuffer
) > 0) {
5779 bufchain_prefix(&c
->v
.v2
.outbuffer
, &data
, &len
);
5780 if ((unsigned)len
> c
->v
.v2
.remwindow
)
5781 len
= c
->v
.v2
.remwindow
;
5782 if ((unsigned)len
> c
->v
.v2
.remmaxpkt
)
5783 len
= c
->v
.v2
.remmaxpkt
;
5784 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA
);
5785 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5786 dont_log_data(ssh
, pktout
, PKTLOG_OMIT
);
5787 ssh2_pkt_addstring_start(pktout
);
5788 ssh2_pkt_addstring_data(pktout
, data
, len
);
5789 end_log_omission(ssh
, pktout
);
5790 ssh2_pkt_send(ssh
, pktout
);
5791 bufchain_consume(&c
->v
.v2
.outbuffer
, len
);
5792 c
->v
.v2
.remwindow
-= len
;
5796 * After having sent as much data as we can, return the amount
5799 return bufchain_size(&c
->v
.v2
.outbuffer
);
5802 static void ssh2_try_send_and_unthrottle(struct ssh_channel
*c
)
5806 return; /* don't send on closing channels */
5807 bufsize
= ssh2_try_send(c
);
5810 case CHAN_MAINSESSION
:
5811 /* stdin need not receive an unthrottle
5812 * notification since it will be polled */
5815 x11_unthrottle(c
->u
.x11
.s
);
5818 /* agent sockets are request/response and need no
5819 * buffer management */
5822 pfd_unthrottle(c
->u
.pfd
.s
);
5829 * Potentially enlarge the window on an SSH-2 channel.
5831 static void ssh2_set_window(struct ssh_channel
*c
, unsigned newwin
)
5836 * Never send WINDOW_ADJUST for a channel that the remote side
5837 * already thinks it's closed; there's no point, since it won't
5838 * be sending any more data anyway.
5844 * Only send a WINDOW_ADJUST if there's significantly more window
5845 * available than the other end thinks there is. This saves us
5846 * sending a WINDOW_ADJUST for every character in a shell session.
5848 * "Significant" is arbitrarily defined as half the window size.
5850 if (newwin
> c
->v
.v2
.locwindow
* 2) {
5851 struct Packet
*pktout
;
5853 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5854 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5855 ssh2_pkt_adduint32(pktout
, newwin
- c
->v
.v2
.locwindow
);
5856 ssh2_pkt_send(ssh
, pktout
);
5857 c
->v
.v2
.locwindow
= newwin
;
5861 static void ssh2_msg_channel_window_adjust(Ssh ssh
, struct Packet
*pktin
)
5863 unsigned i
= ssh_pkt_getuint32(pktin
);
5864 struct ssh_channel
*c
;
5865 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5866 if (c
&& !c
->closes
) {
5867 c
->v
.v2
.remwindow
+= ssh_pkt_getuint32(pktin
);
5868 ssh2_try_send_and_unthrottle(c
);
5872 static void ssh2_msg_channel_data(Ssh ssh
, struct Packet
*pktin
)
5876 unsigned i
= ssh_pkt_getuint32(pktin
);
5877 struct ssh_channel
*c
;
5878 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5880 return; /* nonexistent channel */
5881 if (pktin
->type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
&&
5882 ssh_pkt_getuint32(pktin
) != SSH2_EXTENDED_DATA_STDERR
)
5883 return; /* extended but not stderr */
5884 ssh_pkt_getstring(pktin
, &data
, &length
);
5887 c
->v
.v2
.locwindow
-= length
;
5889 case CHAN_MAINSESSION
:
5891 from_backend(ssh
->frontend
, pktin
->type
==
5892 SSH2_MSG_CHANNEL_EXTENDED_DATA
,
5896 bufsize
= x11_send(c
->u
.x11
.s
, data
, length
);
5899 bufsize
= pfd_send(c
->u
.pfd
.s
, data
, length
);
5902 while (length
> 0) {
5903 if (c
->u
.a
.lensofar
< 4) {
5904 unsigned int l
= min(4 - c
->u
.a
.lensofar
, length
);
5905 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
,
5909 c
->u
.a
.lensofar
+= l
;
5911 if (c
->u
.a
.lensofar
== 4) {
5913 4 + GET_32BIT(c
->u
.a
.msglen
);
5914 c
->u
.a
.message
= snewn(c
->u
.a
.totallen
,
5916 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
5918 if (c
->u
.a
.lensofar
>= 4 && length
> 0) {
5920 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
5922 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
,
5926 c
->u
.a
.lensofar
+= l
;
5928 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
5931 if (agent_query(c
->u
.a
.message
,
5934 ssh_agentf_callback
, c
))
5935 ssh_agentf_callback(c
, reply
, replylen
);
5936 sfree(c
->u
.a
.message
);
5937 c
->u
.a
.lensofar
= 0;
5944 * If we are not buffering too much data,
5945 * enlarge the window again at the remote side.
5947 if (bufsize
< OUR_V2_WINSIZE
)
5948 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
5952 static void ssh2_msg_channel_eof(Ssh ssh
, struct Packet
*pktin
)
5954 unsigned i
= ssh_pkt_getuint32(pktin
);
5955 struct ssh_channel
*c
;
5957 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5959 return; /* nonexistent channel */
5961 if (c
->type
== CHAN_X11
) {
5963 * Remote EOF on an X11 channel means we should
5964 * wrap up and close the channel ourselves.
5966 x11_close(c
->u
.x11
.s
);
5968 } else if (c
->type
== CHAN_AGENT
) {
5970 } else if (c
->type
== CHAN_SOCKDATA
) {
5971 pfd_close(c
->u
.pfd
.s
);
5976 static void ssh2_msg_channel_close(Ssh ssh
, struct Packet
*pktin
)
5978 unsigned i
= ssh_pkt_getuint32(pktin
);
5979 struct ssh_channel
*c
;
5980 struct Packet
*pktout
;
5982 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5983 if (!c
|| c
->halfopen
) {
5984 bombout(("Received CHANNEL_CLOSE for %s channel %d\n",
5985 c ?
"half-open" : "nonexistent", i
));
5988 /* Do pre-close processing on the channel. */
5990 case CHAN_MAINSESSION
:
5991 ssh
->mainchan
= NULL
;
5992 update_specials_menu(ssh
->frontend
);
5995 if (c
->u
.x11
.s
!= NULL
)
5996 x11_close(c
->u
.x11
.s
);
6003 if (c
->u
.pfd
.s
!= NULL
)
6004 pfd_close(c
->u
.pfd
.s
);
6008 if (c
->closes
== 0) {
6009 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
6010 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
6011 ssh2_pkt_send(ssh
, pktout
);
6013 del234(ssh
->channels
, c
);
6014 bufchain_clear(&c
->v
.v2
.outbuffer
);
6018 * See if that was the last channel left open.
6019 * (This is only our termination condition if we're
6020 * not running in -N mode.)
6022 if (!ssh
->cfg
.ssh_no_shell
&& count234(ssh
->channels
) == 0) {
6023 logevent("All channels closed. Disconnecting");
6026 * We used to send SSH_MSG_DISCONNECT here,
6027 * because I'd believed that _every_ conforming
6028 * SSH-2 connection had to end with a disconnect
6029 * being sent by at least one side; apparently
6030 * I was wrong and it's perfectly OK to
6031 * unceremoniously slam the connection shut
6032 * when you're done, and indeed OpenSSH feels
6033 * this is more polite than sending a
6034 * DISCONNECT. So now we don't.
6036 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
6037 ssh2_pkt_adduint32(s
->pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
6038 ssh2_pkt_addstring(s
->pktout
, "All open channels closed");
6039 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
6040 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
6042 ssh
->close_expected
= TRUE
;
6043 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6047 static void ssh2_msg_channel_open_confirmation(Ssh ssh
, struct Packet
*pktin
)
6049 unsigned i
= ssh_pkt_getuint32(pktin
);
6050 struct ssh_channel
*c
;
6051 struct Packet
*pktout
;
6053 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
6055 return; /* nonexistent channel */
6056 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
6057 return; /* dunno why they're confirming this */
6058 c
->remoteid
= ssh_pkt_getuint32(pktin
);
6059 c
->halfopen
= FALSE
;
6060 c
->type
= CHAN_SOCKDATA
;
6061 c
->v
.v2
.remwindow
= ssh_pkt_getuint32(pktin
);
6062 c
->v
.v2
.remmaxpkt
= ssh_pkt_getuint32(pktin
);
6064 pfd_confirm(c
->u
.pfd
.s
);
6067 * We have a pending close on this channel,
6068 * which we decided on before the server acked
6069 * the channel open. So now we know the
6070 * remoteid, we can close it again.
6072 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
6073 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
6074 ssh2_pkt_send(ssh
, pktout
);
6078 static void ssh2_msg_channel_open_failure(Ssh ssh
, struct Packet
*pktin
)
6080 static const char *const reasons
[] = {
6081 "<unknown reason code>",
6082 "Administratively prohibited",
6084 "Unknown channel type",
6085 "Resource shortage",
6087 unsigned i
= ssh_pkt_getuint32(pktin
);
6088 unsigned reason_code
;
6089 char *reason_string
;
6091 struct ssh_channel
*c
;
6092 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
6094 return; /* nonexistent channel */
6095 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
6096 return; /* dunno why they're failing this */
6098 reason_code
= ssh_pkt_getuint32(pktin
);
6099 if (reason_code
>= lenof(reasons
))
6100 reason_code
= 0; /* ensure reasons[reason_code] in range */
6101 ssh_pkt_getstring(pktin
, &reason_string
, &reason_length
);
6102 logeventf(ssh
, "Forwarded connection refused by server: %s [%.*s]",
6103 reasons
[reason_code
], reason_length
, reason_string
);
6105 pfd_close(c
->u
.pfd
.s
);
6107 del234(ssh
->channels
, c
);
6111 static void ssh2_msg_channel_request(Ssh ssh
, struct Packet
*pktin
)
6115 int typelen
, want_reply
;
6116 int reply
= SSH2_MSG_CHANNEL_FAILURE
; /* default */
6117 struct ssh_channel
*c
;
6118 struct Packet
*pktout
;
6120 localid
= ssh_pkt_getuint32(pktin
);
6121 ssh_pkt_getstring(pktin
, &type
, &typelen
);
6122 want_reply
= ssh2_pkt_getbool(pktin
);
6125 * First, check that the channel exists. Otherwise,
6126 * we can instantly disconnect with a rude message.
6128 c
= find234(ssh
->channels
, &localid
, ssh_channelfind
);
6131 sprintf(buf
, "Received channel request for nonexistent"
6132 " channel %d", localid
);
6134 pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
6135 ssh2_pkt_adduint32(pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
6136 ssh2_pkt_addstring(pktout
, buf
);
6137 ssh2_pkt_addstring(pktout
, "en"); /* language tag */
6138 ssh2_pkt_send_noqueue(ssh
, pktout
);
6139 connection_fatal(ssh
->frontend
, "%s", buf
);
6140 ssh
->close_expected
= TRUE
;
6141 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6146 * Having got the channel number, we now look at
6147 * the request type string to see if it's something
6150 if (c
== ssh
->mainchan
) {
6152 * We recognise "exit-status" and "exit-signal" on
6153 * the primary channel.
6155 if (typelen
== 11 &&
6156 !memcmp(type
, "exit-status", 11)) {
6158 ssh
->exitcode
= ssh_pkt_getuint32(pktin
);
6159 logeventf(ssh
, "Server sent command exit status %d",
6161 reply
= SSH2_MSG_CHANNEL_SUCCESS
;
6163 } else if (typelen
== 11 &&
6164 !memcmp(type
, "exit-signal", 11)) {
6166 int is_plausible
= TRUE
, is_int
= FALSE
;
6167 char *fmt_sig
= "", *fmt_msg
= "";
6169 int msglen
= 0, core
= FALSE
;
6170 /* ICK: older versions of OpenSSH (e.g. 3.4p1)
6171 * provide an `int' for the signal, despite its
6172 * having been a `string' in the drafts since at
6173 * least 2001. (Fixed in session.c 1.147.) Try to
6174 * infer which we can safely parse it as. */
6176 unsigned char *p
= pktin
->body
+
6178 long len
= pktin
->length
- pktin
->savedpos
;
6179 unsigned long num
= GET_32BIT(p
); /* what is it? */
6180 /* If it's 0, it hardly matters; assume string */
6184 int maybe_int
= FALSE
, maybe_str
= FALSE
;
6185 #define CHECK_HYPOTHESIS(offset, result) \
6188 if (q >= 0 && q+4 <= len) { \
6189 q = q + 4 + GET_32BIT(p+q); \
6190 if (q >= 0 && q+4 <= len && \
6191 ((q = q + 4 + GET_32BIT(p+q))!= 0) && q == len) \
6195 CHECK_HYPOTHESIS(4+1, maybe_int
);
6196 CHECK_HYPOTHESIS(4+num
+1, maybe_str
);
6197 #undef CHECK_HYPOTHESIS
6198 if (maybe_int
&& !maybe_str
)
6200 else if (!maybe_int
&& maybe_str
)
6203 /* Crikey. Either or neither. Panic. */
6204 is_plausible
= FALSE
;
6209 /* Old non-standard OpenSSH. */
6210 int signum
= ssh_pkt_getuint32(pktin
);
6211 fmt_sig
= dupprintf(" %d", signum
);
6213 /* As per the drafts. */
6216 ssh_pkt_getstring(pktin
, &sig
, &siglen
);
6217 /* Signal name isn't supposed to be blank, but
6218 * let's cope gracefully if it is. */
6220 fmt_sig
= dupprintf(" \"%.*s\"",
6224 core
= ssh2_pkt_getbool(pktin
);
6225 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
6227 fmt_msg
= dupprintf(" (\"%.*s\")", msglen
, msg
);
6229 /* ignore lang tag */
6230 } /* else don't attempt to parse */
6231 logeventf(ssh
, "Server exited on signal%s%s%s",
6232 fmt_sig
, core ?
" (core dumped)" : "",
6234 if (*fmt_sig
) sfree(fmt_sig
);
6235 if (*fmt_msg
) sfree(fmt_msg
);
6236 reply
= SSH2_MSG_CHANNEL_SUCCESS
;
6241 * This is a channel request we don't know
6242 * about, so we now either ignore the request
6243 * or respond with CHANNEL_FAILURE, depending
6246 reply
= SSH2_MSG_CHANNEL_FAILURE
;
6249 pktout
= ssh2_pkt_init(reply
);
6250 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
6251 ssh2_pkt_send(ssh
, pktout
);
6255 static void ssh2_msg_global_request(Ssh ssh
, struct Packet
*pktin
)
6258 int typelen
, want_reply
;
6259 struct Packet
*pktout
;
6261 ssh_pkt_getstring(pktin
, &type
, &typelen
);
6262 want_reply
= ssh2_pkt_getbool(pktin
);
6265 * We currently don't support any global requests
6266 * at all, so we either ignore the request or
6267 * respond with REQUEST_FAILURE, depending on
6271 pktout
= ssh2_pkt_init(SSH2_MSG_REQUEST_FAILURE
);
6272 ssh2_pkt_send(ssh
, pktout
);
6276 static void ssh2_msg_channel_open(Ssh ssh
, struct Packet
*pktin
)
6284 struct ssh_channel
*c
;
6285 unsigned remid
, winsize
, pktsize
;
6286 struct Packet
*pktout
;
6288 ssh_pkt_getstring(pktin
, &type
, &typelen
);
6289 c
= snew(struct ssh_channel
);
6292 remid
= ssh_pkt_getuint32(pktin
);
6293 winsize
= ssh_pkt_getuint32(pktin
);
6294 pktsize
= ssh_pkt_getuint32(pktin
);
6296 if (typelen
== 3 && !memcmp(type
, "x11", 3)) {
6299 ssh_pkt_getstring(pktin
, &peeraddr
, &peeraddrlen
);
6300 addrstr
= snewn(peeraddrlen
+1, char);
6301 memcpy(addrstr
, peeraddr
, peeraddrlen
);
6302 addrstr
[peeraddrlen
] = '\0';
6303 peerport
= ssh_pkt_getuint32(pktin
);
6305 logeventf(ssh
, "Received X11 connect request from %s:%d",
6308 if (!ssh
->X11_fwd_enabled
)
6309 error
= "X11 forwarding is not enabled";
6310 else if (x11_init(&c
->u
.x11
.s
, ssh
->cfg
.x11_display
, c
,
6311 ssh
->x11auth
, addrstr
, peerport
,
6312 &ssh
->cfg
) != NULL
) {
6313 error
= "Unable to open an X11 connection";
6315 logevent("Opening X11 forward connection succeeded");
6320 } else if (typelen
== 15 &&
6321 !memcmp(type
, "forwarded-tcpip", 15)) {
6322 struct ssh_rportfwd pf
, *realpf
;
6325 ssh_pkt_getstring(pktin
, &dummy
, &dummylen
);/* skip address */
6326 pf
.sport
= ssh_pkt_getuint32(pktin
);
6327 ssh_pkt_getstring(pktin
, &peeraddr
, &peeraddrlen
);
6328 peerport
= ssh_pkt_getuint32(pktin
);
6329 realpf
= find234(ssh
->rportfwds
, &pf
, NULL
);
6330 logeventf(ssh
, "Received remote port %d open request "
6331 "from %s:%d", pf
.sport
, peeraddr
, peerport
);
6332 if (realpf
== NULL
) {
6333 error
= "Remote port is not recognised";
6335 const char *e
= pfd_newconnect(&c
->u
.pfd
.s
,
6339 realpf
->pfrec
->addressfamily
);
6340 logeventf(ssh
, "Attempting to forward remote port to "
6341 "%s:%d", realpf
->dhost
, realpf
->dport
);
6343 logeventf(ssh
, "Port open failed: %s", e
);
6344 error
= "Port open failed";
6346 logevent("Forwarded port opened successfully");
6347 c
->type
= CHAN_SOCKDATA
;
6350 } else if (typelen
== 22 &&
6351 !memcmp(type
, "auth-agent@openssh.com", 3)) {
6352 if (!ssh
->agentfwd_enabled
)
6353 error
= "Agent forwarding is not enabled";
6355 c
->type
= CHAN_AGENT
; /* identify channel type */
6356 c
->u
.a
.lensofar
= 0;
6359 error
= "Unsupported channel type requested";
6362 c
->remoteid
= remid
;
6363 c
->halfopen
= FALSE
;
6365 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_FAILURE
);
6366 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
6367 ssh2_pkt_adduint32(pktout
, SSH2_OPEN_CONNECT_FAILED
);
6368 ssh2_pkt_addstring(pktout
, error
);
6369 ssh2_pkt_addstring(pktout
, "en"); /* language tag */
6370 ssh2_pkt_send(ssh
, pktout
);
6371 logeventf(ssh
, "Rejected channel open: %s", error
);
6374 c
->localid
= alloc_channel_id(ssh
);
6376 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
6377 c
->v
.v2
.remwindow
= winsize
;
6378 c
->v
.v2
.remmaxpkt
= pktsize
;
6379 bufchain_init(&c
->v
.v2
.outbuffer
);
6380 add234(ssh
->channels
, c
);
6381 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
);
6382 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
6383 ssh2_pkt_adduint32(pktout
, c
->localid
);
6384 ssh2_pkt_adduint32(pktout
, c
->v
.v2
.locwindow
);
6385 ssh2_pkt_adduint32(pktout
, OUR_V2_MAXPKT
); /* our max pkt size */
6386 ssh2_pkt_send(ssh
, pktout
);
6390 /* Helper function to deal with sending tty modes for "pty-req" */
6391 static void ssh2_send_ttymode(void *data
, char *mode
, char *val
)
6393 struct Packet
*pktout
= (struct Packet
*)data
;
6395 unsigned int arg
= 0;
6396 while (strcmp(mode
, ssh_ttymodes
[i
].mode
) != 0) i
++;
6397 if (i
== lenof(ssh_ttymodes
)) return;
6398 switch (ssh_ttymodes
[i
].type
) {
6400 arg
= ssh_tty_parse_specchar(val
);
6403 arg
= ssh_tty_parse_boolean(val
);
6406 ssh2_pkt_addbyte(pktout
, ssh_ttymodes
[i
].opcode
);
6407 ssh2_pkt_adduint32(pktout
, arg
);
6411 * Handle the SSH-2 userauth and connection layers.
6413 static void do_ssh2_authconn(Ssh ssh
, unsigned char *in
, int inlen
,
6414 struct Packet
*pktin
)
6416 struct do_ssh2_authconn_state
{
6418 AUTH_INVALID
, AUTH_PUBLICKEY_AGENT
, AUTH_PUBLICKEY_FILE
,
6420 AUTH_KEYBOARD_INTERACTIVE
6424 AUTH_TYPE_PUBLICKEY
,
6425 AUTH_TYPE_PUBLICKEY_OFFER_LOUD
,
6426 AUTH_TYPE_PUBLICKEY_OFFER_QUIET
,
6428 AUTH_TYPE_KEYBOARD_INTERACTIVE
,
6429 AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
6431 int gotit
, need_pw
, can_pubkey
, can_passwd
, can_keyb_inter
;
6432 int tried_pubkey_config
, tried_agent
;
6433 int kbd_inter_running
, kbd_inter_refused
;
6435 int num_prompts
, curr_prompt
, echo
;
6440 void *publickey_blob
;
6441 int publickey_bloblen
;
6442 unsigned char request
[5], *response
, *p
;
6446 char *pkblob
, *alg
, *commentp
;
6447 int pklen
, alglen
, commentlen
;
6448 int siglen
, retlen
, len
;
6449 char *q
, *agentreq
, *ret
;
6451 int num_env
, env_left
, env_ok
;
6452 struct Packet
*pktout
;
6454 crState(do_ssh2_authconn_state
);
6456 crBegin(ssh
->do_ssh2_authconn_crstate
);
6459 * Request userauth protocol, and await a response to it.
6461 s
->pktout
= ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST
);
6462 ssh2_pkt_addstring(s
->pktout
, "ssh-userauth");
6463 ssh2_pkt_send(ssh
, s
->pktout
);
6464 crWaitUntilV(pktin
);
6465 if (pktin
->type
!= SSH2_MSG_SERVICE_ACCEPT
) {
6466 bombout(("Server refused user authentication protocol"));
6471 * We repeat this whole loop, including the username prompt,
6472 * until we manage a successful authentication. If the user
6473 * types the wrong _password_, they can be sent back to the
6474 * beginning to try another username, if this is configured on.
6475 * (If they specify a username in the config, they are never
6476 * asked, even if they do give a wrong password.)
6478 * I think this best serves the needs of
6480 * - the people who have no configuration, no keys, and just
6481 * want to try repeated (username,password) pairs until they
6482 * type both correctly
6484 * - people who have keys and configuration but occasionally
6485 * need to fall back to passwords
6487 * - people with a key held in Pageant, who might not have
6488 * logged in to a particular machine before; so they want to
6489 * type a username, and then _either_ their key will be
6490 * accepted, _or_ they will type a password. If they mistype
6491 * the username they will want to be able to get back and
6494 s
->username
[0] = '\0';
6495 s
->got_username
= FALSE
;
6500 if (s
->got_username
&& !ssh
->cfg
.change_username
) {
6502 * We got a username last time round this loop, and
6503 * with change_username turned off we don't try to get
6506 } else if (!*ssh
->cfg
.username
) {
6507 if (ssh_get_line
&& !ssh_getline_pw_only
) {
6508 if (!ssh_get_line("login as: ",
6509 s
->username
, sizeof(s
->username
), FALSE
)) {
6511 * get_line failed to get a username.
6514 logevent("No username provided. Abandoning session.");
6515 ssh
->close_expected
= TRUE
;
6516 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6520 int ret
; /* need not be saved across crReturn */
6521 c_write_str(ssh
, "login as: ");
6523 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
6525 crWaitUntilV(!pktin
);
6526 ret
= process_userpass_input(ssh
, in
, inlen
);
6530 c_write_str(ssh
, "\r\n");
6532 s
->username
[strcspn(s
->username
, "\n\r")] = '\0';
6535 strncpy(s
->username
, ssh
->cfg
.username
, sizeof(s
->username
));
6536 s
->username
[sizeof(s
->username
)-1] = '\0';
6537 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
6538 stuff
= dupprintf("Using username \"%s\".\r\n", s
->username
);
6539 c_write_str(ssh
, stuff
);
6543 s
->got_username
= TRUE
;
6546 * Send an authentication request using method "none": (a)
6547 * just in case it succeeds, and (b) so that we know what
6548 * authentication methods we can usefully try next.
6550 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6552 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6553 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6554 ssh2_pkt_addstring(s
->pktout
, "ssh-connection");/* service requested */
6555 ssh2_pkt_addstring(s
->pktout
, "none"); /* method */
6556 ssh2_pkt_send(ssh
, s
->pktout
);
6557 s
->type
= AUTH_TYPE_NONE
;
6559 s
->we_are_in
= FALSE
;
6561 s
->tried_pubkey_config
= FALSE
;
6562 s
->tried_agent
= FALSE
;
6563 s
->kbd_inter_running
= FALSE
;
6564 s
->kbd_inter_refused
= FALSE
;
6565 /* Load the pub half of ssh->cfg.keyfile so we notice if it's in Pageant */
6566 if (!filename_is_null(ssh
->cfg
.keyfile
)) {
6568 logeventf(ssh
, "Reading private key file \"%.150s\"",
6569 filename_to_str(&ssh
->cfg
.keyfile
));
6570 keytype
= key_type(&ssh
->cfg
.keyfile
);
6571 if (keytype
== SSH_KEYTYPE_SSH2
) {
6573 ssh2_userkey_loadpub(&ssh
->cfg
.keyfile
, NULL
,
6574 &s
->publickey_bloblen
, NULL
);
6577 logeventf(ssh
, "Unable to use this key file (%s)",
6578 key_type_to_str(keytype
));
6579 msgbuf
= dupprintf("Unable to use key file \"%.150s\""
6581 filename_to_str(&ssh
->cfg
.keyfile
),
6582 key_type_to_str(keytype
));
6583 c_write_str(ssh
, msgbuf
);
6585 s
->publickey_blob
= NULL
;
6588 s
->publickey_blob
= NULL
;
6592 * Wait for the result of the last authentication request.
6595 crWaitUntilV(pktin
);
6596 while (pktin
->type
== SSH2_MSG_USERAUTH_BANNER
) {
6600 * Don't show the banner if we're operating in
6601 * non-verbose non-interactive mode. (It's probably
6602 * a script, which means nobody will read the
6603 * banner _anyway_, and moreover the printing of
6604 * the banner will screw up processing on the
6605 * output of (say) plink.)
6607 if (flags
& (FLAG_VERBOSE
| FLAG_INTERACTIVE
)) {
6608 ssh_pkt_getstring(pktin
, &banner
, &size
);
6610 c_write_untrusted(ssh
, banner
, size
);
6612 crWaitUntilV(pktin
);
6614 if (pktin
->type
== SSH2_MSG_USERAUTH_SUCCESS
) {
6615 logevent("Access granted");
6616 s
->we_are_in
= TRUE
;
6620 if (s
->kbd_inter_running
&&
6621 pktin
->type
== SSH2_MSG_USERAUTH_INFO_REQUEST
) {
6623 * This is either a further set-of-prompts packet
6624 * in keyboard-interactive authentication, or it's
6625 * the same one and we came back here with `gotit'
6626 * set. In the former case, we must reset the
6627 * curr_prompt variable.
6631 } else if (pktin
->type
== SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ
) {
6632 /* FIXME: perhaps we should support this? */
6633 bombout(("PASSWD_CHANGEREQ not yet supported"));
6635 } else if (pktin
->type
!= SSH2_MSG_USERAUTH_FAILURE
) {
6636 bombout(("Strange packet received during authentication: type %d",
6644 * OK, we're now sitting on a USERAUTH_FAILURE message, so
6645 * we can look at the string in it and know what we can
6646 * helpfully try next.
6648 if (pktin
->type
== SSH2_MSG_USERAUTH_FAILURE
) {
6651 ssh_pkt_getstring(pktin
, &methods
, &methlen
);
6652 s
->kbd_inter_running
= FALSE
;
6653 if (!ssh2_pkt_getbool(pktin
)) {
6655 * We have received an unequivocal Access
6656 * Denied. This can translate to a variety of
6659 * - if we'd just tried "none" authentication,
6660 * it's not worth printing anything at all
6662 * - if we'd just tried a public key _offer_,
6663 * the message should be "Server refused our
6664 * key" (or no message at all if the key
6665 * came from Pageant)
6667 * - if we'd just tried anything else, the
6668 * message really should be "Access denied".
6670 * Additionally, if we'd just tried password
6671 * authentication, we should break out of this
6672 * whole loop so as to go back to the username
6673 * prompt (iff we're configured to allow
6674 * username change attempts).
6676 if (s
->type
== AUTH_TYPE_NONE
) {
6678 } else if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
||
6679 s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_QUIET
) {
6680 if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
)
6681 c_write_str(ssh
, "Server refused our key\r\n");
6682 logevent("Server refused public key");
6683 } else if (s
->type
==AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
) {
6684 /* server declined keyboard-interactive; ignore */
6686 c_write_str(ssh
, "Access denied\r\n");
6687 logevent("Access denied");
6688 if (s
->type
== AUTH_TYPE_PASSWORD
&&
6689 ssh
->cfg
.change_username
) {
6690 /* XXX perhaps we should allow
6691 * keyboard-interactive to do this too? */
6692 s
->we_are_in
= FALSE
;
6697 c_write_str(ssh
, "Further authentication required\r\n");
6698 logevent("Further authentication required");
6702 in_commasep_string("publickey", methods
, methlen
);
6704 in_commasep_string("password", methods
, methlen
);
6705 s
->can_keyb_inter
= ssh
->cfg
.try_ki_auth
&&
6706 in_commasep_string("keyboard-interactive", methods
, methlen
);
6710 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6714 * Most password/passphrase prompts will be
6715 * non-echoing, so we set this to 0 by default.
6716 * Exception is that some keyboard-interactive prompts
6717 * can be echoing, in which case we'll set this to 1.
6721 if (!s
->method
&& s
->can_pubkey
&&
6722 agent_exists() && !s
->tried_agent
) {
6724 * Attempt public-key authentication using Pageant.
6729 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6730 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
6732 s
->tried_agent
= TRUE
;
6734 logevent("Pageant is running. Requesting keys.");
6736 /* Request the keys held by the agent. */
6737 PUT_32BIT(s
->request
, 1);
6738 s
->request
[4] = SSH2_AGENTC_REQUEST_IDENTITIES
;
6739 if (!agent_query(s
->request
, 5, &r
, &s
->responselen
,
6740 ssh_agent_callback
, ssh
)) {
6744 bombout(("Unexpected data from server while"
6745 " waiting for agent response"));
6748 } while (pktin
|| inlen
> 0);
6749 r
= ssh
->agent_response
;
6750 s
->responselen
= ssh
->agent_response_len
;
6752 s
->response
= (unsigned char *) r
;
6753 if (s
->response
&& s
->responselen
>= 5 &&
6754 s
->response
[4] == SSH2_AGENT_IDENTITIES_ANSWER
) {
6755 s
->p
= s
->response
+ 5;
6756 s
->nkeys
= GET_32BIT(s
->p
);
6758 logeventf(ssh
, "Pageant has %d SSH-2 keys", s
->nkeys
);
6759 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
6762 logeventf(ssh
, "Trying Pageant key #%d", s
->keyi
);
6763 s
->pklen
= GET_32BIT(s
->p
);
6765 if (s
->publickey_blob
&&
6766 s
->pklen
== s
->publickey_bloblen
&&
6767 !memcmp(s
->p
, s
->publickey_blob
,
6768 s
->publickey_bloblen
)) {
6769 logevent("This key matches configured key file");
6770 s
->tried_pubkey_config
= 1;
6772 s
->pkblob
= (char *)s
->p
;
6774 s
->alglen
= GET_32BIT(s
->pkblob
);
6775 s
->alg
= s
->pkblob
+ 4;
6776 s
->commentlen
= GET_32BIT(s
->p
);
6778 s
->commentp
= (char *)s
->p
;
6779 s
->p
+= s
->commentlen
;
6780 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6781 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6782 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6783 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6784 ssh2_pkt_addbool(s
->pktout
, FALSE
); /* no signature included */
6785 ssh2_pkt_addstring_start(s
->pktout
);
6786 ssh2_pkt_addstring_data(s
->pktout
, s
->alg
, s
->alglen
);
6787 ssh2_pkt_addstring_start(s
->pktout
);
6788 ssh2_pkt_addstring_data(s
->pktout
, s
->pkblob
, s
->pklen
);
6789 ssh2_pkt_send(ssh
, s
->pktout
);
6791 crWaitUntilV(pktin
);
6792 if (pktin
->type
!= SSH2_MSG_USERAUTH_PK_OK
) {
6793 logevent("Key refused");
6797 if (flags
& FLAG_VERBOSE
) {
6798 c_write_str(ssh
, "Authenticating with "
6800 c_write(ssh
, s
->commentp
, s
->commentlen
);
6801 c_write_str(ssh
, "\" from agent\r\n");
6805 * Server is willing to accept the key.
6806 * Construct a SIGN_REQUEST.
6808 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6809 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6810 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6811 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6812 ssh2_pkt_addbool(s
->pktout
, TRUE
);
6813 ssh2_pkt_addstring_start(s
->pktout
);
6814 ssh2_pkt_addstring_data(s
->pktout
, s
->alg
, s
->alglen
);
6815 ssh2_pkt_addstring_start(s
->pktout
);
6816 ssh2_pkt_addstring_data(s
->pktout
, s
->pkblob
, s
->pklen
);
6818 s
->siglen
= s
->pktout
->length
- 5 + 4 + 20;
6819 if (ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)
6821 s
->len
= 1; /* message type */
6822 s
->len
+= 4 + s
->pklen
; /* key blob */
6823 s
->len
+= 4 + s
->siglen
; /* data to sign */
6824 s
->len
+= 4; /* flags */
6825 s
->agentreq
= snewn(4 + s
->len
, char);
6826 PUT_32BIT(s
->agentreq
, s
->len
);
6827 s
->q
= s
->agentreq
+ 4;
6828 *s
->q
++ = SSH2_AGENTC_SIGN_REQUEST
;
6829 PUT_32BIT(s
->q
, s
->pklen
);
6831 memcpy(s
->q
, s
->pkblob
, s
->pklen
);
6833 PUT_32BIT(s
->q
, s
->siglen
);
6835 /* Now the data to be signed... */
6836 if (!(ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)) {
6837 PUT_32BIT(s
->q
, 20);
6840 memcpy(s
->q
, ssh
->v2_session_id
, 20);
6842 memcpy(s
->q
, s
->pktout
->data
+ 5,
6843 s
->pktout
->length
- 5);
6844 s
->q
+= s
->pktout
->length
- 5;
6845 /* And finally the (zero) flags word. */
6847 if (!agent_query(s
->agentreq
, s
->len
+ 4,
6849 ssh_agent_callback
, ssh
)) {
6853 bombout(("Unexpected data from server"
6854 " while waiting for agent"
6858 } while (pktin
|| inlen
> 0);
6859 vret
= ssh
->agent_response
;
6860 s
->retlen
= ssh
->agent_response_len
;
6865 if (s
->ret
[4] == SSH2_AGENT_SIGN_RESPONSE
) {
6866 logevent("Sending Pageant's response");
6867 ssh2_add_sigblob(ssh
, s
->pktout
,
6868 s
->pkblob
, s
->pklen
,
6870 GET_32BIT(s
->ret
+ 5));
6871 ssh2_pkt_send(ssh
, s
->pktout
);
6876 ("Pageant failed to answer challenge");
6887 if (!s
->method
&& s
->can_pubkey
&& s
->publickey_blob
6888 && !s
->tried_pubkey_config
) {
6889 unsigned char *pub_blob
;
6890 char *algorithm
, *comment
;
6893 s
->tried_pubkey_config
= TRUE
;
6895 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6896 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
6899 * Try the public key supplied in the configuration.
6901 * First, offer the public blob to see if the server is
6902 * willing to accept it.
6905 (unsigned char *)ssh2_userkey_loadpub(&ssh
->cfg
.keyfile
,
6910 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6911 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6912 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6913 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6914 ssh2_pkt_addbool(s
->pktout
, FALSE
); /* no signature included */
6915 ssh2_pkt_addstring(s
->pktout
, algorithm
);
6916 ssh2_pkt_addstring_start(s
->pktout
);
6917 ssh2_pkt_addstring_data(s
->pktout
, (char *)pub_blob
,
6919 ssh2_pkt_send(ssh
, s
->pktout
);
6920 logevent("Offered public key");
6922 crWaitUntilV(pktin
);
6923 if (pktin
->type
!= SSH2_MSG_USERAUTH_PK_OK
) {
6925 s
->type
= AUTH_TYPE_PUBLICKEY_OFFER_LOUD
;
6926 continue; /* key refused; give up on it */
6929 logevent("Offer of public key accepted");
6931 * Actually attempt a serious authentication using
6934 if (ssh2_userkey_encrypted(&ssh
->cfg
.keyfile
, &comment
)) {
6935 sprintf(s
->pwprompt
,
6936 "Passphrase for key \"%.100s\": ",
6942 if (flags
& FLAG_VERBOSE
) {
6943 c_write_str(ssh
, "Authenticating with public key \"");
6944 c_write_str(ssh
, comment
);
6945 c_write_str(ssh
, "\"\r\n");
6947 s
->method
= AUTH_PUBLICKEY_FILE
;
6951 if (!s
->method
&& s
->can_keyb_inter
&& !s
->kbd_inter_refused
&&
6952 !s
->kbd_inter_running
) {
6953 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
6954 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
6956 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6957 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
6959 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6960 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6961 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6962 ssh2_pkt_addstring(s
->pktout
, "keyboard-interactive"); /* method */
6963 ssh2_pkt_addstring(s
->pktout
, ""); /* lang */
6964 ssh2_pkt_addstring(s
->pktout
, "");
6965 ssh2_pkt_send(ssh
, s
->pktout
);
6967 crWaitUntilV(pktin
);
6968 if (pktin
->type
!= SSH2_MSG_USERAUTH_INFO_REQUEST
) {
6969 if (pktin
->type
== SSH2_MSG_USERAUTH_FAILURE
)
6971 logevent("Keyboard-interactive authentication refused");
6972 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
;
6973 s
->kbd_inter_refused
= TRUE
; /* don't try it again */
6977 c_write_str(ssh
, "Using keyboard-interactive authentication.\r\n");
6978 s
->kbd_inter_running
= TRUE
;
6982 if (s
->kbd_inter_running
) {
6983 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
6984 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
6986 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6987 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
6989 if (s
->curr_prompt
== 0) {
6991 * We've got a fresh USERAUTH_INFO_REQUEST.
6992 * Display header data, and start going through
6995 char *name
, *inst
, *lang
;
6996 int name_len
, inst_len
, lang_len
;
6998 ssh_pkt_getstring(pktin
, &name
, &name_len
);
6999 ssh_pkt_getstring(pktin
, &inst
, &inst_len
);
7000 ssh_pkt_getstring(pktin
, &lang
, &lang_len
);
7002 c_write_untrusted(ssh
, name
, name_len
);
7003 c_write_str(ssh
, "\r\n");
7006 c_write_untrusted(ssh
, inst
, inst_len
);
7007 c_write_str(ssh
, "\r\n");
7009 s
->num_prompts
= ssh_pkt_getuint32(pktin
);
7013 * If there are prompts remaining in the packet,
7014 * display one and get a response.
7016 if (s
->curr_prompt
< s
->num_prompts
) {
7020 ssh_pkt_getstring(pktin
, &prompt
, &prompt_len
);
7021 if (prompt_len
> 0) {
7022 static const char trunc
[] = "<prompt truncated>: ";
7023 static const int prlen
= sizeof(s
->pwprompt
) -
7025 if (prompt_len
> prlen
) {
7026 memcpy(s
->pwprompt
, prompt
, prlen
);
7027 strcpy(s
->pwprompt
+ prlen
, trunc
);
7029 memcpy(s
->pwprompt
, prompt
, prompt_len
);
7030 s
->pwprompt
[prompt_len
] = '\0';
7034 "<server failed to send prompt>: ");
7036 s
->echo
= ssh2_pkt_getbool(pktin
);
7042 if (!s
->method
&& s
->can_passwd
) {
7043 s
->method
= AUTH_PASSWORD
;
7044 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
7045 ssh
->pkt_ctx
|= SSH2_PKTCTX_PASSWORD
;
7046 sprintf(s
->pwprompt
, "%.90s@%.90s's password: ", s
->username
,
7053 if (!ssh_get_line(s
->pwprompt
, s
->password
,
7054 sizeof(s
->password
), TRUE
)) {
7056 * get_line failed to get a password (for
7057 * example because one was supplied on the
7058 * command line which has already failed to
7061 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
7062 ssh2_pkt_adduint32(s
->pktout
,SSH2_DISCONNECT_BY_APPLICATION
);
7063 ssh2_pkt_addstring(s
->pktout
, "No more passwords available"
7065 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
7066 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
7067 logevent("Unable to authenticate");
7068 connection_fatal(ssh
->frontend
,
7069 "Unable to authenticate");
7070 ssh
->close_expected
= TRUE
;
7071 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
7075 int ret
; /* need not be saved across crReturn */
7076 c_write_untrusted(ssh
, s
->pwprompt
, strlen(s
->pwprompt
));
7079 setup_userpass_input(ssh
, s
->password
,
7080 sizeof(s
->password
), s
->echo
);
7082 crWaitUntilV(!pktin
);
7083 ret
= process_userpass_input(ssh
, in
, inlen
);
7087 c_write_str(ssh
, "\r\n");
7091 if (s
->method
== AUTH_PUBLICKEY_FILE
) {
7093 * We have our passphrase. Now try the actual authentication.
7095 struct ssh2_userkey
*key
;
7096 const char *error
= NULL
;
7098 key
= ssh2_load_userkey(&ssh
->cfg
.keyfile
, s
->password
,
7100 if (key
== SSH2_WRONG_PASSPHRASE
|| key
== NULL
) {
7101 if (key
== SSH2_WRONG_PASSPHRASE
) {
7102 c_write_str(ssh
, "Wrong passphrase\r\n");
7103 s
->tried_pubkey_config
= FALSE
;
7105 c_write_str(ssh
, "Unable to load private key (");
7106 c_write_str(ssh
, error
);
7107 c_write_str(ssh
, ")\r\n");
7108 s
->tried_pubkey_config
= TRUE
;
7110 /* Send a spurious AUTH_NONE to return to the top. */
7111 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
7112 ssh2_pkt_addstring(s
->pktout
, s
->username
);
7113 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
7114 ssh2_pkt_addstring(s
->pktout
, "none"); /* method */
7115 ssh2_pkt_send(ssh
, s
->pktout
);
7116 s
->type
= AUTH_TYPE_NONE
;
7118 unsigned char *pkblob
, *sigblob
, *sigdata
;
7119 int pkblob_len
, sigblob_len
, sigdata_len
;
7123 * We have loaded the private key and the server
7124 * has announced that it's willing to accept it.
7125 * Hallelujah. Generate a signature and send it.
7127 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
7128 ssh2_pkt_addstring(s
->pktout
, s
->username
);
7129 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
7130 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
7131 ssh2_pkt_addbool(s
->pktout
, TRUE
);
7132 ssh2_pkt_addstring(s
->pktout
, key
->alg
->name
);
7133 pkblob
= key
->alg
->public_blob(key
->data
, &pkblob_len
);
7134 ssh2_pkt_addstring_start(s
->pktout
);
7135 ssh2_pkt_addstring_data(s
->pktout
, (char *)pkblob
, pkblob_len
);
7138 * The data to be signed is:
7142 * followed by everything so far placed in the
7145 sigdata_len
= s
->pktout
->length
- 5 + 4 + 20;
7146 if (ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)
7148 sigdata
= snewn(sigdata_len
, unsigned char);
7150 if (!(ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)) {
7151 PUT_32BIT(sigdata
+p
, 20);
7154 memcpy(sigdata
+p
, ssh
->v2_session_id
, 20); p
+= 20;
7155 memcpy(sigdata
+p
, s
->pktout
->data
+ 5,
7156 s
->pktout
->length
- 5);
7157 p
+= s
->pktout
->length
- 5;
7158 assert(p
== sigdata_len
);
7159 sigblob
= key
->alg
->sign(key
->data
, (char *)sigdata
,
7160 sigdata_len
, &sigblob_len
);
7161 ssh2_add_sigblob(ssh
, s
->pktout
, pkblob
, pkblob_len
,
7162 sigblob
, sigblob_len
);
7167 ssh2_pkt_send(ssh
, s
->pktout
);
7168 s
->type
= AUTH_TYPE_PUBLICKEY
;
7169 key
->alg
->freekey(key
->data
);
7171 } else if (s
->method
== AUTH_PASSWORD
) {
7173 * We pad out the password packet to 256 bytes to make
7174 * it harder for an attacker to find the length of the
7177 * Anyone using a password longer than 256 bytes
7178 * probably doesn't have much to worry about from
7179 * people who find out how long their password is!
7181 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
7182 s
->pktout
->forcepad
= 256;
7183 ssh2_pkt_addstring(s
->pktout
, s
->username
);
7184 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
7185 ssh2_pkt_addstring(s
->pktout
, "password");
7186 ssh2_pkt_addbool(s
->pktout
, FALSE
);
7187 dont_log_password(ssh
, s
->pktout
, PKTLOG_BLANK
);
7188 ssh2_pkt_addstring(s
->pktout
, s
->password
);
7189 memset(s
->password
, 0, sizeof(s
->password
));
7190 end_log_omission(ssh
, s
->pktout
);
7191 ssh2_pkt_send(ssh
, s
->pktout
);
7192 logevent("Sent password");
7193 s
->type
= AUTH_TYPE_PASSWORD
;
7194 } else if (s
->method
== AUTH_KEYBOARD_INTERACTIVE
) {
7195 if (s
->curr_prompt
== 0) {
7196 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_INFO_RESPONSE
);
7197 s
->pktout
->forcepad
= 256;
7198 ssh2_pkt_adduint32(s
->pktout
, s
->num_prompts
);
7200 if (s
->need_pw
) { /* only add pw if we just got one! */
7201 dont_log_password(ssh
, s
->pktout
, PKTLOG_BLANK
);
7202 ssh2_pkt_addstring(s
->pktout
, s
->password
);
7203 memset(s
->password
, 0, sizeof(s
->password
));
7204 end_log_omission(ssh
, s
->pktout
);
7207 if (s
->curr_prompt
>= s
->num_prompts
) {
7208 ssh2_pkt_send(ssh
, s
->pktout
);
7211 * If there are prompts remaining, we set
7212 * `gotit' so that we won't attempt to get
7213 * another packet. Then we go back round the
7214 * loop and will end up retrieving another
7215 * prompt out of the existing packet. Funky or
7220 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
7222 c_write_str(ssh
, "No supported authentication methods"
7223 " left to try!\r\n");
7224 logevent("No supported authentications offered."
7226 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
7227 ssh2_pkt_adduint32(s
->pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
7228 ssh2_pkt_addstring(s
->pktout
, "No supported authentication"
7229 " methods available");
7230 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
7231 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
7232 ssh
->close_expected
= TRUE
;
7233 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
7237 } while (!s
->we_are_in
);
7240 * Now we're authenticated for the connection protocol. The
7241 * connection protocol will automatically have started at this
7242 * point; there's no need to send SERVICE_REQUEST.
7245 ssh
->channels
= newtree234(ssh_channelcmp
);
7248 * Set up handlers for some connection protocol messages, so we
7249 * don't have to handle them repeatedly in this coroutine.
7251 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_WINDOW_ADJUST
] =
7252 ssh2_msg_channel_window_adjust
;
7253 ssh
->packet_dispatch
[SSH2_MSG_GLOBAL_REQUEST
] =
7254 ssh2_msg_global_request
;
7257 * Create the main session channel.
7259 if (!ssh
->cfg
.ssh_no_shell
) {
7260 ssh
->mainchan
= snew(struct ssh_channel
);
7261 ssh
->mainchan
->ssh
= ssh
;
7262 ssh
->mainchan
->localid
= alloc_channel_id(ssh
);
7263 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
7264 ssh2_pkt_addstring(s
->pktout
, "session");
7265 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->localid
);
7266 ssh
->mainchan
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
7267 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->v
.v2
.locwindow
);/* our window size */
7268 ssh2_pkt_adduint32(s
->pktout
, OUR_V2_MAXPKT
); /* our max pkt size */
7269 ssh2_pkt_send(ssh
, s
->pktout
);
7270 crWaitUntilV(pktin
);
7271 if (pktin
->type
!= SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
7272 bombout(("Server refused to open a session"));
7274 /* FIXME: error data comes back in FAILURE packet */
7276 if (ssh_pkt_getuint32(pktin
) != ssh
->mainchan
->localid
) {
7277 bombout(("Server's channel confirmation cited wrong channel"));
7280 ssh
->mainchan
->remoteid
= ssh_pkt_getuint32(pktin
);
7281 ssh
->mainchan
->halfopen
= FALSE
;
7282 ssh
->mainchan
->type
= CHAN_MAINSESSION
;
7283 ssh
->mainchan
->closes
= 0;
7284 ssh
->mainchan
->v
.v2
.remwindow
= ssh_pkt_getuint32(pktin
);
7285 ssh
->mainchan
->v
.v2
.remmaxpkt
= ssh_pkt_getuint32(pktin
);
7286 bufchain_init(&ssh
->mainchan
->v
.v2
.outbuffer
);
7287 add234(ssh
->channels
, ssh
->mainchan
);
7288 update_specials_menu(ssh
->frontend
);
7289 logevent("Opened channel for session");
7291 ssh
->mainchan
= NULL
;
7294 * Now we have a channel, make dispatch table entries for
7295 * general channel-based messages.
7297 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_DATA
] =
7298 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EXTENDED_DATA
] =
7299 ssh2_msg_channel_data
;
7300 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EOF
] = ssh2_msg_channel_eof
;
7301 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_CLOSE
] = ssh2_msg_channel_close
;
7302 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
] =
7303 ssh2_msg_channel_open_confirmation
;
7304 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_FAILURE
] =
7305 ssh2_msg_channel_open_failure
;
7306 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_REQUEST
] =
7307 ssh2_msg_channel_request
;
7308 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN
] =
7309 ssh2_msg_channel_open
;
7312 * Potentially enable X11 forwarding.
7314 if (ssh
->mainchan
&& ssh
->cfg
.x11_forward
) {
7315 char proto
[20], data
[64];
7316 logevent("Requesting X11 forwarding");
7317 ssh
->x11auth
= x11_invent_auth(proto
, sizeof(proto
),
7318 data
, sizeof(data
), ssh
->cfg
.x11_auth
);
7319 x11_get_real_auth(ssh
->x11auth
, ssh
->cfg
.x11_display
);
7320 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7321 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
7322 ssh2_pkt_addstring(s
->pktout
, "x11-req");
7323 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7324 ssh2_pkt_addbool(s
->pktout
, 0); /* many connections */
7325 ssh2_pkt_addstring(s
->pktout
, proto
);
7327 * Note that while we blank the X authentication data here, we don't
7328 * take any special action to blank the start of an X11 channel,
7329 * so using MIT-MAGIC-COOKIE-1 and actually opening an X connection
7330 * without having session blanking enabled is likely to leak your
7331 * cookie into the log.
7333 dont_log_password(ssh
, s
->pktout
, PKTLOG_BLANK
);
7334 ssh2_pkt_addstring(s
->pktout
, data
);
7335 end_log_omission(ssh
, s
->pktout
);
7336 ssh2_pkt_adduint32(s
->pktout
, x11_get_screen_number(ssh
->cfg
.x11_display
));
7337 ssh2_pkt_send(ssh
, s
->pktout
);
7339 crWaitUntilV(pktin
);
7341 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
7342 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
7343 bombout(("Unexpected response to X11 forwarding request:"
7344 " packet type %d", pktin
->type
));
7347 logevent("X11 forwarding refused");
7349 logevent("X11 forwarding enabled");
7350 ssh
->X11_fwd_enabled
= TRUE
;
7355 * Enable port forwardings.
7357 ssh_setup_portfwd(ssh
, &ssh
->cfg
);
7360 * Potentially enable agent forwarding.
7362 if (ssh
->mainchan
&& ssh
->cfg
.agentfwd
&& agent_exists()) {
7363 logevent("Requesting OpenSSH-style agent forwarding");
7364 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7365 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
7366 ssh2_pkt_addstring(s
->pktout
, "auth-agent-req@openssh.com");
7367 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7368 ssh2_pkt_send(ssh
, s
->pktout
);
7370 crWaitUntilV(pktin
);
7372 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
7373 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
7374 bombout(("Unexpected response to agent forwarding request:"
7375 " packet type %d", pktin
->type
));
7378 logevent("Agent forwarding refused");
7380 logevent("Agent forwarding enabled");
7381 ssh
->agentfwd_enabled
= TRUE
;
7386 * Now allocate a pty for the session.
7388 if (ssh
->mainchan
&& !ssh
->cfg
.nopty
) {
7389 /* Unpick the terminal-speed string. */
7390 /* XXX perhaps we should allow no speeds to be sent. */
7391 ssh
->ospeed
= 38400; ssh
->ispeed
= 38400; /* last-resort defaults */
7392 sscanf(ssh
->cfg
.termspeed
, "%d,%d", &ssh
->ospeed
, &ssh
->ispeed
);
7393 /* Build the pty request. */
7394 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7395 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
); /* recipient channel */
7396 ssh2_pkt_addstring(s
->pktout
, "pty-req");
7397 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7398 ssh2_pkt_addstring(s
->pktout
, ssh
->cfg
.termtype
);
7399 ssh2_pkt_adduint32(s
->pktout
, ssh
->term_width
);
7400 ssh2_pkt_adduint32(s
->pktout
, ssh
->term_height
);
7401 ssh2_pkt_adduint32(s
->pktout
, 0); /* pixel width */
7402 ssh2_pkt_adduint32(s
->pktout
, 0); /* pixel height */
7403 ssh2_pkt_addstring_start(s
->pktout
);
7404 parse_ttymodes(ssh
, ssh
->cfg
.ttymodes
,
7405 ssh2_send_ttymode
, (void *)s
->pktout
);
7406 ssh2_pkt_addbyte(s
->pktout
, SSH2_TTY_OP_ISPEED
);
7407 ssh2_pkt_adduint32(s
->pktout
, ssh
->ispeed
);
7408 ssh2_pkt_addbyte(s
->pktout
, SSH2_TTY_OP_OSPEED
);
7409 ssh2_pkt_adduint32(s
->pktout
, ssh
->ospeed
);
7410 ssh2_pkt_addstring_data(s
->pktout
, "\0", 1); /* TTY_OP_END */
7411 ssh2_pkt_send(ssh
, s
->pktout
);
7412 ssh
->state
= SSH_STATE_INTERMED
;
7414 crWaitUntilV(pktin
);
7416 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
7417 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
7418 bombout(("Unexpected response to pty request:"
7419 " packet type %d", pktin
->type
));
7422 c_write_str(ssh
, "Server refused to allocate pty\r\n");
7423 ssh
->editing
= ssh
->echoing
= 1;
7425 logeventf(ssh
, "Allocated pty (ospeed %dbps, ispeed %dbps)",
7426 ssh
->ospeed
, ssh
->ispeed
);
7429 ssh
->editing
= ssh
->echoing
= 1;
7433 * Send environment variables.
7435 * Simplest thing here is to send all the requests at once, and
7436 * then wait for a whole bunch of successes or failures.
7438 if (ssh
->mainchan
&& *ssh
->cfg
.environmt
) {
7439 char *e
= ssh
->cfg
.environmt
;
7440 char *var
, *varend
, *val
;
7446 while (*e
&& *e
!= '\t') e
++;
7448 if (*e
== '\t') e
++;
7453 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7454 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
7455 ssh2_pkt_addstring(s
->pktout
, "env");
7456 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7457 ssh2_pkt_addstring_start(s
->pktout
);
7458 ssh2_pkt_addstring_data(s
->pktout
, var
, varend
-var
);
7459 ssh2_pkt_addstring(s
->pktout
, val
);
7460 ssh2_pkt_send(ssh
, s
->pktout
);
7465 logeventf(ssh
, "Sent %d environment variables", s
->num_env
);
7468 s
->env_left
= s
->num_env
;
7470 while (s
->env_left
> 0) {
7471 crWaitUntilV(pktin
);
7473 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
7474 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
7475 bombout(("Unexpected response to environment request:"
7476 " packet type %d", pktin
->type
));
7486 if (s
->env_ok
== s
->num_env
) {
7487 logevent("All environment variables successfully set");
7488 } else if (s
->env_ok
== 0) {
7489 logevent("All environment variables refused");
7490 c_write_str(ssh
, "Server refused to set environment variables\r\n");
7492 logeventf(ssh
, "%d environment variables refused",
7493 s
->num_env
- s
->env_ok
);
7494 c_write_str(ssh
, "Server refused to set all environment variables\r\n");
7499 * Start a shell or a remote command. We may have to attempt
7500 * this twice if the config data has provided a second choice
7503 if (ssh
->mainchan
) while (1) {
7507 if (ssh
->fallback_cmd
) {
7508 subsys
= ssh
->cfg
.ssh_subsys2
;
7509 cmd
= ssh
->cfg
.remote_cmd_ptr2
;
7511 subsys
= ssh
->cfg
.ssh_subsys
;
7512 cmd
= ssh
->cfg
.remote_cmd_ptr
;
7513 if (!cmd
) cmd
= ssh
->cfg
.remote_cmd
;
7516 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7517 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
); /* recipient channel */
7519 ssh2_pkt_addstring(s
->pktout
, "subsystem");
7520 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7521 ssh2_pkt_addstring(s
->pktout
, cmd
);
7523 ssh2_pkt_addstring(s
->pktout
, "exec");
7524 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7525 ssh2_pkt_addstring(s
->pktout
, cmd
);
7527 ssh2_pkt_addstring(s
->pktout
, "shell");
7528 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7530 ssh2_pkt_send(ssh
, s
->pktout
);
7532 crWaitUntilV(pktin
);
7534 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
7535 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
7536 bombout(("Unexpected response to shell/command request:"
7537 " packet type %d", pktin
->type
));
7541 * We failed to start the command. If this is the
7542 * fallback command, we really are finished; if it's
7543 * not, and if the fallback command exists, try falling
7544 * back to it before complaining.
7546 if (!ssh
->fallback_cmd
&& ssh
->cfg
.remote_cmd_ptr2
!= NULL
) {
7547 logevent("Primary command failed; attempting fallback");
7548 ssh
->fallback_cmd
= TRUE
;
7551 bombout(("Server refused to start a shell/command"));
7554 logevent("Started a shell/command");
7559 ssh
->state
= SSH_STATE_SESSION
;
7560 if (ssh
->size_needed
)
7561 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
7562 if (ssh
->eof_needed
)
7563 ssh_special(ssh
, TS_EOF
);
7569 ldisc_send(ssh
->ldisc
, NULL
, 0, 0);/* cause ldisc to notice changes */
7574 s
->try_send
= FALSE
;
7578 * _All_ the connection-layer packets we expect to
7579 * receive are now handled by the dispatch table.
7580 * Anything that reaches here must be bogus.
7583 bombout(("Strange packet received: type %d", pktin
->type
));
7585 } else if (ssh
->mainchan
) {
7587 * We have spare data. Add it to the channel buffer.
7589 ssh2_add_channel_data(ssh
->mainchan
, (char *)in
, inlen
);
7594 struct ssh_channel
*c
;
7596 * Try to send data on all channels if we can.
7598 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++)
7599 ssh2_try_send_and_unthrottle(c
);
7607 * Handlers for SSH-2 messages that might arrive at any moment.
7609 static void ssh2_msg_disconnect(Ssh ssh
, struct Packet
*pktin
)
7611 /* log reason code in disconnect message */
7613 int nowlen
, reason
, msglen
;
7615 reason
= ssh_pkt_getuint32(pktin
);
7616 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
7618 if (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) {
7619 buf
= dupprintf("Received disconnect message (%s)",
7620 ssh2_disconnect_reasons
[reason
]);
7622 buf
= dupprintf("Received disconnect message (unknown"
7623 " type %d)", reason
);
7627 buf
= dupprintf("Disconnection message text: %n%.*s",
7628 &nowlen
, msglen
, msg
);
7630 bombout(("Server sent disconnect message\ntype %d (%s):\n\"%s\"",
7632 (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) ?
7633 ssh2_disconnect_reasons
[reason
] : "unknown",
7638 static void ssh2_msg_debug(Ssh ssh
, struct Packet
*pktin
)
7640 /* log the debug message */
7645 /* XXX maybe we should actually take notice of this */
7646 always_display
= ssh2_pkt_getbool(pktin
);
7647 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
7649 logeventf(ssh
, "Remote debug message: %.*s", msglen
, msg
);
7652 static void ssh2_msg_something_unimplemented(Ssh ssh
, struct Packet
*pktin
)
7654 struct Packet
*pktout
;
7655 pktout
= ssh2_pkt_init(SSH2_MSG_UNIMPLEMENTED
);
7656 ssh2_pkt_adduint32(pktout
, pktin
->sequence
);
7658 * UNIMPLEMENTED messages MUST appear in the same order as the
7659 * messages they respond to. Hence, never queue them.
7661 ssh2_pkt_send_noqueue(ssh
, pktout
);
7665 * Handle the top-level SSH-2 protocol.
7667 static void ssh2_protocol_setup(Ssh ssh
)
7672 * Most messages cause SSH2_MSG_UNIMPLEMENTED.
7674 for (i
= 0; i
< 256; i
++)
7675 ssh
->packet_dispatch
[i
] = ssh2_msg_something_unimplemented
;
7678 * Any message we actually understand, we set to NULL so that
7679 * the coroutines will get it.
7681 ssh
->packet_dispatch
[SSH2_MSG_UNIMPLEMENTED
] = NULL
;
7682 ssh
->packet_dispatch
[SSH2_MSG_SERVICE_REQUEST
] = NULL
;
7683 ssh
->packet_dispatch
[SSH2_MSG_SERVICE_ACCEPT
] = NULL
;
7684 ssh
->packet_dispatch
[SSH2_MSG_KEXINIT
] = NULL
;
7685 ssh
->packet_dispatch
[SSH2_MSG_NEWKEYS
] = NULL
;
7686 ssh
->packet_dispatch
[SSH2_MSG_KEXDH_INIT
] = NULL
;
7687 ssh
->packet_dispatch
[SSH2_MSG_KEXDH_REPLY
] = NULL
;
7688 /* ssh->packet_dispatch[SSH2_MSG_KEX_DH_GEX_REQUEST] = NULL; duplicate case value */
7689 /* ssh->packet_dispatch[SSH2_MSG_KEX_DH_GEX_GROUP] = NULL; duplicate case value */
7690 ssh
->packet_dispatch
[SSH2_MSG_KEX_DH_GEX_INIT
] = NULL
;
7691 ssh
->packet_dispatch
[SSH2_MSG_KEX_DH_GEX_REPLY
] = NULL
;
7692 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_REQUEST
] = NULL
;
7693 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_FAILURE
] = NULL
;
7694 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_SUCCESS
] = NULL
;
7695 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_BANNER
] = NULL
;
7696 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_PK_OK
] = NULL
;
7697 /* ssh->packet_dispatch[SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ] = NULL; duplicate case value */
7698 /* ssh->packet_dispatch[SSH2_MSG_USERAUTH_INFO_REQUEST] = NULL; duplicate case value */
7699 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_INFO_RESPONSE
] = NULL
;
7700 ssh
->packet_dispatch
[SSH2_MSG_GLOBAL_REQUEST
] = NULL
;
7701 ssh
->packet_dispatch
[SSH2_MSG_REQUEST_SUCCESS
] = NULL
;
7702 ssh
->packet_dispatch
[SSH2_MSG_REQUEST_FAILURE
] = NULL
;
7703 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN
] = NULL
;
7704 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
] = NULL
;
7705 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_FAILURE
] = NULL
;
7706 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_WINDOW_ADJUST
] = NULL
;
7707 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_DATA
] = NULL
;
7708 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EXTENDED_DATA
] = NULL
;
7709 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EOF
] = NULL
;
7710 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_CLOSE
] = NULL
;
7711 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_REQUEST
] = NULL
;
7712 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_SUCCESS
] = NULL
;
7713 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_FAILURE
] = NULL
;
7716 * These special message types we install handlers for.
7718 ssh
->packet_dispatch
[SSH2_MSG_DISCONNECT
] = ssh2_msg_disconnect
;
7719 ssh
->packet_dispatch
[SSH2_MSG_IGNORE
] = ssh_msg_ignore
; /* shared with SSH-1 */
7720 ssh
->packet_dispatch
[SSH2_MSG_DEBUG
] = ssh2_msg_debug
;
7723 static void ssh2_timer(void *ctx
, long now
)
7727 if (ssh
->state
== SSH_STATE_CLOSED
)
7730 if (!ssh
->kex_in_progress
&& ssh
->cfg
.ssh_rekey_time
!= 0 &&
7731 now
- ssh
->next_rekey
>= 0) {
7732 do_ssh2_transport(ssh
, "timeout", -1, NULL
);
7736 static void ssh2_protocol(Ssh ssh
, void *vin
, int inlen
,
7737 struct Packet
*pktin
)
7739 unsigned char *in
= (unsigned char *)vin
;
7740 if (ssh
->state
== SSH_STATE_CLOSED
)
7744 ssh
->incoming_data_size
+= pktin
->encrypted_len
;
7745 if (!ssh
->kex_in_progress
&&
7746 ssh
->max_data_size
!= 0 &&
7747 ssh
->incoming_data_size
> ssh
->max_data_size
)
7748 do_ssh2_transport(ssh
, "too much data received", -1, NULL
);
7751 if (pktin
&& ssh
->packet_dispatch
[pktin
->type
]) {
7752 ssh
->packet_dispatch
[pktin
->type
](ssh
, pktin
);
7756 if (!ssh
->protocol_initial_phase_done
||
7757 (pktin
&& pktin
->type
>= 20 && pktin
->type
< 50)) {
7758 if (do_ssh2_transport(ssh
, in
, inlen
, pktin
) &&
7759 !ssh
->protocol_initial_phase_done
) {
7760 ssh
->protocol_initial_phase_done
= TRUE
;
7762 * Allow authconn to initialise itself.
7764 do_ssh2_authconn(ssh
, NULL
, 0, NULL
);
7767 do_ssh2_authconn(ssh
, in
, inlen
, pktin
);
7772 * Called to set up the connection.
7774 * Returns an error message, or NULL on success.
7776 static const char *ssh_init(void *frontend_handle
, void **backend_handle
,
7778 char *host
, int port
, char **realhost
, int nodelay
,
7784 ssh
= snew(struct ssh_tag
);
7785 ssh
->cfg
= *cfg
; /* STRUCTURE COPY */
7786 ssh
->version
= 0; /* when not ready yet */
7789 ssh
->v1_cipher_ctx
= NULL
;
7790 ssh
->crcda_ctx
= NULL
;
7791 ssh
->cscipher
= NULL
;
7792 ssh
->cs_cipher_ctx
= NULL
;
7793 ssh
->sccipher
= NULL
;
7794 ssh
->sc_cipher_ctx
= NULL
;
7796 ssh
->cs_mac_ctx
= NULL
;
7798 ssh
->sc_mac_ctx
= NULL
;
7800 ssh
->cs_comp_ctx
= NULL
;
7802 ssh
->sc_comp_ctx
= NULL
;
7804 ssh
->kex_ctx
= NULL
;
7805 ssh
->hostkey
= NULL
;
7807 ssh
->close_expected
= FALSE
;
7808 ssh
->state
= SSH_STATE_PREPACKET
;
7809 ssh
->size_needed
= FALSE
;
7810 ssh
->eof_needed
= FALSE
;
7813 ssh
->deferred_send_data
= NULL
;
7814 ssh
->deferred_len
= 0;
7815 ssh
->deferred_size
= 0;
7816 ssh
->fallback_cmd
= 0;
7818 ssh
->x11auth
= NULL
;
7819 ssh
->v1_compressing
= FALSE
;
7820 ssh
->v2_outgoing_sequence
= 0;
7821 ssh
->ssh1_rdpkt_crstate
= 0;
7822 ssh
->ssh2_rdpkt_crstate
= 0;
7823 ssh
->do_ssh_init_crstate
= 0;
7824 ssh
->ssh_gotdata_crstate
= 0;
7825 ssh
->do_ssh1_connection_crstate
= 0;
7826 ssh
->do_ssh1_login_crstate
= 0;
7827 ssh
->do_ssh2_transport_crstate
= 0;
7828 ssh
->do_ssh2_authconn_crstate
= 0;
7829 ssh
->do_ssh_init_state
= NULL
;
7830 ssh
->do_ssh1_login_state
= NULL
;
7831 ssh
->do_ssh2_transport_state
= NULL
;
7832 ssh
->do_ssh2_authconn_state
= NULL
;
7833 ssh
->mainchan
= NULL
;
7834 ssh
->throttled_all
= 0;
7835 ssh
->v1_stdout_throttling
= 0;
7837 ssh
->queuelen
= ssh
->queuesize
= 0;
7838 ssh
->queueing
= FALSE
;
7839 ssh
->qhead
= ssh
->qtail
= NULL
;
7840 ssh
->deferred_rekey_reason
= NULL
;
7841 bufchain_init(&ssh
->queued_incoming_data
);
7842 ssh
->frozen
= FALSE
;
7844 *backend_handle
= ssh
;
7847 if (crypto_startup() == 0)
7848 return "Microsoft high encryption pack not installed!";
7851 ssh
->frontend
= frontend_handle
;
7852 ssh
->term_width
= ssh
->cfg
.width
;
7853 ssh
->term_height
= ssh
->cfg
.height
;
7855 ssh
->channels
= NULL
;
7856 ssh
->rportfwds
= NULL
;
7857 ssh
->portfwds
= NULL
;
7862 ssh
->v1_throttle_count
= 0;
7863 ssh
->overall_bufsize
= 0;
7864 ssh
->fallback_cmd
= 0;
7866 ssh
->protocol
= NULL
;
7868 ssh
->protocol_initial_phase_done
= FALSE
;
7872 ssh
->incoming_data_size
= ssh
->outgoing_data_size
=
7873 ssh
->deferred_data_size
= 0L;
7874 ssh
->max_data_size
= parse_blocksize(ssh
->cfg
.ssh_rekey_data
);
7875 ssh
->kex_in_progress
= FALSE
;
7877 p
= connect_to_host(ssh
, host
, port
, realhost
, nodelay
, keepalive
);
7886 static void ssh_free(void *handle
)
7888 Ssh ssh
= (Ssh
) handle
;
7889 struct ssh_channel
*c
;
7890 struct ssh_rportfwd
*pf
;
7892 if (ssh
->v1_cipher_ctx
)
7893 ssh
->cipher
->free_context(ssh
->v1_cipher_ctx
);
7894 if (ssh
->cs_cipher_ctx
)
7895 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
7896 if (ssh
->sc_cipher_ctx
)
7897 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
7898 if (ssh
->cs_mac_ctx
)
7899 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
7900 if (ssh
->sc_mac_ctx
)
7901 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
7902 if (ssh
->cs_comp_ctx
) {
7904 ssh
->cscomp
->compress_cleanup(ssh
->cs_comp_ctx
);
7906 zlib_compress_cleanup(ssh
->cs_comp_ctx
);
7908 if (ssh
->sc_comp_ctx
) {
7910 ssh
->sccomp
->decompress_cleanup(ssh
->sc_comp_ctx
);
7912 zlib_decompress_cleanup(ssh
->sc_comp_ctx
);
7915 dh_cleanup(ssh
->kex_ctx
);
7916 sfree(ssh
->savedhost
);
7918 while (ssh
->queuelen
-- > 0)
7919 ssh_free_packet(ssh
->queue
[ssh
->queuelen
]);
7922 while (ssh
->qhead
) {
7923 struct queued_handler
*qh
= ssh
->qhead
;
7924 ssh
->qhead
= qh
->next
;
7927 ssh
->qhead
= ssh
->qtail
= NULL
;
7929 if (ssh
->channels
) {
7930 while ((c
= delpos234(ssh
->channels
, 0)) != NULL
) {
7933 if (c
->u
.x11
.s
!= NULL
)
7934 x11_close(c
->u
.x11
.s
);
7937 if (c
->u
.pfd
.s
!= NULL
)
7938 pfd_close(c
->u
.pfd
.s
);
7943 freetree234(ssh
->channels
);
7944 ssh
->channels
= NULL
;
7947 if (ssh
->rportfwds
) {
7948 while ((pf
= delpos234(ssh
->rportfwds
, 0)) != NULL
)
7950 freetree234(ssh
->rportfwds
);
7951 ssh
->rportfwds
= NULL
;
7953 sfree(ssh
->deferred_send_data
);
7955 x11_free_auth(ssh
->x11auth
);
7956 sfree(ssh
->do_ssh_init_state
);
7957 sfree(ssh
->do_ssh1_login_state
);
7958 sfree(ssh
->do_ssh2_transport_state
);
7959 sfree(ssh
->do_ssh2_authconn_state
);
7960 if (ssh
->crcda_ctx
) {
7961 crcda_free_context(ssh
->crcda_ctx
);
7962 ssh
->crcda_ctx
= NULL
;
7965 ssh_do_close(ssh
, TRUE
);
7966 expire_timer_context(ssh
);
7968 pinger_free(ssh
->pinger
);
7969 bufchain_clear(&ssh
->queued_incoming_data
);
7976 * Reconfigure the SSH backend.
7978 static void ssh_reconfig(void *handle
, Config
*cfg
)
7980 Ssh ssh
= (Ssh
) handle
;
7981 char *rekeying
= NULL
, rekey_mandatory
= FALSE
;
7982 unsigned long old_max_data_size
;
7984 pinger_reconfig(ssh
->pinger
, &ssh
->cfg
, cfg
);
7985 ssh_setup_portfwd(ssh
, cfg
);
7987 if (ssh
->cfg
.ssh_rekey_time
!= cfg
->ssh_rekey_time
&&
7988 cfg
->ssh_rekey_time
!= 0) {
7989 long new_next
= ssh
->last_rekey
+ cfg
->ssh_rekey_time
*60*TICKSPERSEC
;
7990 long now
= GETTICKCOUNT();
7992 if (new_next
- now
< 0) {
7993 rekeying
= "timeout shortened";
7995 ssh
->next_rekey
= schedule_timer(new_next
- now
, ssh2_timer
, ssh
);
7999 old_max_data_size
= ssh
->max_data_size
;
8000 ssh
->max_data_size
= parse_blocksize(cfg
->ssh_rekey_data
);
8001 if (old_max_data_size
!= ssh
->max_data_size
&&
8002 ssh
->max_data_size
!= 0) {
8003 if (ssh
->outgoing_data_size
> ssh
->max_data_size
||
8004 ssh
->incoming_data_size
> ssh
->max_data_size
)
8005 rekeying
= "data limit lowered";
8008 if (ssh
->cfg
.compression
!= cfg
->compression
) {
8009 rekeying
= "compression setting changed";
8010 rekey_mandatory
= TRUE
;
8013 if (ssh
->cfg
.ssh2_des_cbc
!= cfg
->ssh2_des_cbc
||
8014 memcmp(ssh
->cfg
.ssh_cipherlist
, cfg
->ssh_cipherlist
,
8015 sizeof(ssh
->cfg
.ssh_cipherlist
))) {
8016 rekeying
= "cipher settings changed";
8017 rekey_mandatory
= TRUE
;
8020 ssh
->cfg
= *cfg
; /* STRUCTURE COPY */
8023 if (!ssh
->kex_in_progress
) {
8024 do_ssh2_transport(ssh
, rekeying
, -1, NULL
);
8025 } else if (rekey_mandatory
) {
8026 ssh
->deferred_rekey_reason
= rekeying
;
8032 * Called to send data down the Telnet connection.
8034 static int ssh_send(void *handle
, char *buf
, int len
)
8036 Ssh ssh
= (Ssh
) handle
;
8038 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
8041 ssh
->protocol(ssh
, (unsigned char *)buf
, len
, 0);
8043 return ssh_sendbuffer(ssh
);
8047 * Called to query the current amount of buffered stdin data.
8049 static int ssh_sendbuffer(void *handle
)
8051 Ssh ssh
= (Ssh
) handle
;
8054 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
8058 * If the SSH socket itself has backed up, add the total backup
8059 * size on that to any individual buffer on the stdin channel.
8062 if (ssh
->throttled_all
)
8063 override_value
= ssh
->overall_bufsize
;
8065 if (ssh
->version
== 1) {
8066 return override_value
;
8067 } else if (ssh
->version
== 2) {
8068 if (!ssh
->mainchan
|| ssh
->mainchan
->closes
> 0)
8069 return override_value
;
8071 return (override_value
+
8072 bufchain_size(&ssh
->mainchan
->v
.v2
.outbuffer
));
8079 * Called to set the size of the window from SSH's POV.
8081 static void ssh_size(void *handle
, int width
, int height
)
8083 Ssh ssh
= (Ssh
) handle
;
8084 struct Packet
*pktout
;
8086 ssh
->term_width
= width
;
8087 ssh
->term_height
= height
;
8089 switch (ssh
->state
) {
8090 case SSH_STATE_BEFORE_SIZE
:
8091 case SSH_STATE_PREPACKET
:
8092 case SSH_STATE_CLOSED
:
8093 break; /* do nothing */
8094 case SSH_STATE_INTERMED
:
8095 ssh
->size_needed
= TRUE
; /* buffer for later */
8097 case SSH_STATE_SESSION
:
8098 if (!ssh
->cfg
.nopty
) {
8099 if (ssh
->version
== 1) {
8100 send_packet(ssh
, SSH1_CMSG_WINDOW_SIZE
,
8101 PKT_INT
, ssh
->term_height
,
8102 PKT_INT
, ssh
->term_width
,
8103 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
8104 } else if (ssh
->mainchan
) {
8105 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
8106 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
8107 ssh2_pkt_addstring(pktout
, "window-change");
8108 ssh2_pkt_addbool(pktout
, 0);
8109 ssh2_pkt_adduint32(pktout
, ssh
->term_width
);
8110 ssh2_pkt_adduint32(pktout
, ssh
->term_height
);
8111 ssh2_pkt_adduint32(pktout
, 0);
8112 ssh2_pkt_adduint32(pktout
, 0);
8113 ssh2_pkt_send(ssh
, pktout
);
8121 * Return a list of the special codes that make sense in this
8124 static const struct telnet_special
*ssh_get_specials(void *handle
)
8126 static const struct telnet_special ssh1_ignore_special
[] = {
8127 {"IGNORE message", TS_NOP
}
8129 static const struct telnet_special ssh2_transport_specials
[] = {
8130 {"IGNORE message", TS_NOP
},
8131 {"Repeat key exchange", TS_REKEY
},
8133 static const struct telnet_special ssh2_session_specials
[] = {
8136 /* These are the signal names defined by draft-ietf-secsh-connect-23.
8137 * They include all the ISO C signals, but are a subset of the POSIX
8138 * required signals. */
8139 {"SIGINT (Interrupt)", TS_SIGINT
},
8140 {"SIGTERM (Terminate)", TS_SIGTERM
},
8141 {"SIGKILL (Kill)", TS_SIGKILL
},
8142 {"SIGQUIT (Quit)", TS_SIGQUIT
},
8143 {"SIGHUP (Hangup)", TS_SIGHUP
},
8144 {"More signals", TS_SUBMENU
},
8145 {"SIGABRT", TS_SIGABRT
}, {"SIGALRM", TS_SIGALRM
},
8146 {"SIGFPE", TS_SIGFPE
}, {"SIGILL", TS_SIGILL
},
8147 {"SIGPIPE", TS_SIGPIPE
}, {"SIGSEGV", TS_SIGSEGV
},
8148 {"SIGUSR1", TS_SIGUSR1
}, {"SIGUSR2", TS_SIGUSR2
},
8151 static const struct telnet_special specials_end
[] = {
8154 /* XXX review this length for any changes: */
8155 static struct telnet_special ssh_specials
[lenof(ssh2_transport_specials
) +
8156 lenof(ssh2_session_specials
) +
8157 lenof(specials_end
)];
8158 Ssh ssh
= (Ssh
) handle
;
8160 #define ADD_SPECIALS(name) \
8162 assert((i + lenof(name)) <= lenof(ssh_specials)); \
8163 memcpy(&ssh_specials[i], name, sizeof name); \
8167 if (ssh
->version
== 1) {
8168 /* Don't bother offering IGNORE if we've decided the remote
8169 * won't cope with it, since we wouldn't bother sending it if
8171 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
))
8172 ADD_SPECIALS(ssh1_ignore_special
);
8173 } else if (ssh
->version
== 2) {
8174 ADD_SPECIALS(ssh2_transport_specials
);
8176 ADD_SPECIALS(ssh2_session_specials
);
8177 } /* else we're not ready yet */
8180 ADD_SPECIALS(specials_end
);
8181 return ssh_specials
;
8189 * Send Telnet special codes. TS_EOF is useful for `plink', so you
8190 * can send an EOF and collect resulting output (e.g. `plink
8193 static void ssh_special(void *handle
, Telnet_Special code
)
8195 Ssh ssh
= (Ssh
) handle
;
8196 struct Packet
*pktout
;
8198 if (code
== TS_EOF
) {
8199 if (ssh
->state
!= SSH_STATE_SESSION
) {
8201 * Buffer the EOF in case we are pre-SESSION, so we can
8202 * send it as soon as we reach SESSION.
8205 ssh
->eof_needed
= TRUE
;
8208 if (ssh
->version
== 1) {
8209 send_packet(ssh
, SSH1_CMSG_EOF
, PKT_END
);
8210 } else if (ssh
->mainchan
) {
8211 struct Packet
*pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF
);
8212 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
8213 ssh2_pkt_send(ssh
, pktout
);
8214 ssh
->send_ok
= 0; /* now stop trying to read from stdin */
8216 logevent("Sent EOF message");
8217 } else if (code
== TS_PING
|| code
== TS_NOP
) {
8218 if (ssh
->state
== SSH_STATE_CLOSED
8219 || ssh
->state
== SSH_STATE_PREPACKET
) return;
8220 if (ssh
->version
== 1) {
8221 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
))
8222 send_packet(ssh
, SSH1_MSG_IGNORE
, PKT_STR
, "", PKT_END
);
8224 pktout
= ssh2_pkt_init(SSH2_MSG_IGNORE
);
8225 ssh2_pkt_addstring_start(pktout
);
8226 ssh2_pkt_send_noqueue(ssh
, pktout
);
8228 } else if (code
== TS_REKEY
) {
8229 if (!ssh
->kex_in_progress
&& ssh
->version
== 2) {
8230 do_ssh2_transport(ssh
, "at user request", -1, NULL
);
8232 } else if (code
== TS_BRK
) {
8233 if (ssh
->state
== SSH_STATE_CLOSED
8234 || ssh
->state
== SSH_STATE_PREPACKET
) return;
8235 if (ssh
->version
== 1) {
8236 logevent("Unable to send BREAK signal in SSH-1");
8237 } else if (ssh
->mainchan
) {
8238 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
8239 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
8240 ssh2_pkt_addstring(pktout
, "break");
8241 ssh2_pkt_addbool(pktout
, 0);
8242 ssh2_pkt_adduint32(pktout
, 0); /* default break length */
8243 ssh2_pkt_send(ssh
, pktout
);
8246 /* Is is a POSIX signal? */
8247 char *signame
= NULL
;
8248 if (code
== TS_SIGABRT
) signame
= "ABRT";
8249 if (code
== TS_SIGALRM
) signame
= "ALRM";
8250 if (code
== TS_SIGFPE
) signame
= "FPE";
8251 if (code
== TS_SIGHUP
) signame
= "HUP";
8252 if (code
== TS_SIGILL
) signame
= "ILL";
8253 if (code
== TS_SIGINT
) signame
= "INT";
8254 if (code
== TS_SIGKILL
) signame
= "KILL";
8255 if (code
== TS_SIGPIPE
) signame
= "PIPE";
8256 if (code
== TS_SIGQUIT
) signame
= "QUIT";
8257 if (code
== TS_SIGSEGV
) signame
= "SEGV";
8258 if (code
== TS_SIGTERM
) signame
= "TERM";
8259 if (code
== TS_SIGUSR1
) signame
= "USR1";
8260 if (code
== TS_SIGUSR2
) signame
= "USR2";
8261 /* The SSH-2 protocol does in principle support arbitrary named
8262 * signals, including signame@domain, but we don't support those. */
8264 /* It's a signal. */
8265 if (ssh
->version
== 2 && ssh
->mainchan
) {
8266 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
8267 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
8268 ssh2_pkt_addstring(pktout
, "signal");
8269 ssh2_pkt_addbool(pktout
, 0);
8270 ssh2_pkt_addstring(pktout
, signame
);
8271 ssh2_pkt_send(ssh
, pktout
);
8272 logeventf(ssh
, "Sent signal SIG%s", signame
);
8275 /* Never heard of it. Do nothing */
8280 void *new_sock_channel(void *handle
, Socket s
)
8282 Ssh ssh
= (Ssh
) handle
;
8283 struct ssh_channel
*c
;
8284 c
= snew(struct ssh_channel
);
8289 c
->localid
= alloc_channel_id(ssh
);
8291 c
->type
= CHAN_SOCKDATA_DORMANT
;/* identify channel type */
8293 bufchain_init(&c
->v
.v2
.outbuffer
);
8294 add234(ssh
->channels
, c
);
8300 * This is called when stdout/stderr (the entity to which
8301 * from_backend sends data) manages to clear some backlog.
8303 static void ssh_unthrottle(void *handle
, int bufsize
)
8305 Ssh ssh
= (Ssh
) handle
;
8306 if (ssh
->version
== 1) {
8307 if (ssh
->v1_stdout_throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
8308 ssh
->v1_stdout_throttling
= 0;
8309 ssh1_throttle(ssh
, -1);
8312 if (ssh
->mainchan
&& ssh
->mainchan
->closes
== 0)
8313 ssh2_set_window(ssh
->mainchan
, OUR_V2_WINSIZE
- bufsize
);
8317 void ssh_send_port_open(void *channel
, char *hostname
, int port
, char *org
)
8319 struct ssh_channel
*c
= (struct ssh_channel
*)channel
;
8321 struct Packet
*pktout
;
8323 logeventf(ssh
, "Opening forwarded connection to %s:%d", hostname
, port
);
8325 if (ssh
->version
== 1) {
8326 send_packet(ssh
, SSH1_MSG_PORT_OPEN
,
8327 PKT_INT
, c
->localid
,
8330 /* PKT_STR, <org:orgport>, */
8333 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
8334 ssh2_pkt_addstring(pktout
, "direct-tcpip");
8335 ssh2_pkt_adduint32(pktout
, c
->localid
);
8336 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
8337 ssh2_pkt_adduint32(pktout
, c
->v
.v2
.locwindow
);/* our window size */
8338 ssh2_pkt_adduint32(pktout
, OUR_V2_MAXPKT
); /* our max pkt size */
8339 ssh2_pkt_addstring(pktout
, hostname
);
8340 ssh2_pkt_adduint32(pktout
, port
);
8342 * We make up values for the originator data; partly it's
8343 * too much hassle to keep track, and partly I'm not
8344 * convinced the server should be told details like that
8345 * about my local network configuration.
8347 ssh2_pkt_addstring(pktout
, "client-side-connection");
8348 ssh2_pkt_adduint32(pktout
, 0);
8349 ssh2_pkt_send(ssh
, pktout
);
8353 static Socket
ssh_socket(void *handle
)
8355 Ssh ssh
= (Ssh
) handle
;
8359 static int ssh_sendok(void *handle
)
8361 Ssh ssh
= (Ssh
) handle
;
8362 return ssh
->send_ok
;
8365 static int ssh_ldisc(void *handle
, int option
)
8367 Ssh ssh
= (Ssh
) handle
;
8368 if (option
== LD_ECHO
)
8369 return ssh
->echoing
;
8370 if (option
== LD_EDIT
)
8371 return ssh
->editing
;
8375 static void ssh_provide_ldisc(void *handle
, void *ldisc
)
8377 Ssh ssh
= (Ssh
) handle
;
8381 static void ssh_provide_logctx(void *handle
, void *logctx
)
8383 Ssh ssh
= (Ssh
) handle
;
8384 ssh
->logctx
= logctx
;
8387 static int ssh_return_exitcode(void *handle
)
8389 Ssh ssh
= (Ssh
) handle
;
8393 return (ssh
->exitcode
>= 0 ? ssh
->exitcode
: 0);
8397 * cfg_info for SSH is the currently running version of the
8398 * protocol. (1 for 1; 2 for 2; 0 for not-decided-yet.)
8400 static int ssh_cfg_info(void *handle
)
8402 Ssh ssh
= (Ssh
) handle
;
8403 return ssh
->version
;
8407 * Gross hack: pscp will try to start SFTP but fall back to scp1 if
8408 * that fails. This variable is the means by which scp.c can reach
8409 * into the SSH code and find out which one it got.
8411 extern int ssh_fallback_cmd(void *handle
)
8413 Ssh ssh
= (Ssh
) handle
;
8414 return ssh
->fallback_cmd
;
8417 Backend ssh_backend
= {
8427 ssh_return_exitcode
,