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().
1803 * Send an SSH-2 packet immediately, without queuing or deferring.
1805 static void ssh2_pkt_send_noqueue(Ssh ssh
, struct Packet
*pkt
)
1809 len
= ssh2_pkt_construct(ssh
, pkt
);
1810 backlog
= sk_write(ssh
->s
, (char *)pkt
->data
, len
);
1811 if (backlog
> SSH_MAX_BACKLOG
)
1812 ssh_throttle_all(ssh
, 1, backlog
);
1814 ssh
->outgoing_data_size
+= pkt
->encrypted_len
;
1815 if (!ssh
->kex_in_progress
&&
1816 ssh
->max_data_size
!= 0 &&
1817 ssh
->outgoing_data_size
> ssh
->max_data_size
)
1818 do_ssh2_transport(ssh
, "too much data sent", -1, NULL
);
1820 ssh_free_packet(pkt
);
1824 * Defer an SSH-2 packet.
1826 static void ssh2_pkt_defer_noqueue(Ssh ssh
, struct Packet
*pkt
)
1828 int len
= ssh2_pkt_construct(ssh
, pkt
);
1829 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1830 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1831 ssh
->deferred_send_data
= sresize(ssh
->deferred_send_data
,
1835 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, pkt
->data
, len
);
1836 ssh
->deferred_len
+= len
;
1837 ssh
->deferred_data_size
+= pkt
->encrypted_len
;
1838 ssh_free_packet(pkt
);
1842 * Queue an SSH-2 packet.
1844 static void ssh2_pkt_queue(Ssh ssh
, struct Packet
*pkt
)
1846 assert(ssh
->queueing
);
1848 if (ssh
->queuelen
>= ssh
->queuesize
) {
1849 ssh
->queuesize
= ssh
->queuelen
+ 32;
1850 ssh
->queue
= sresize(ssh
->queue
, ssh
->queuesize
, struct Packet
*);
1853 ssh
->queue
[ssh
->queuelen
++] = pkt
;
1857 * Either queue or send a packet, depending on whether queueing is
1860 static void ssh2_pkt_send(Ssh ssh
, struct Packet
*pkt
)
1863 ssh2_pkt_queue(ssh
, pkt
);
1865 ssh2_pkt_send_noqueue(ssh
, pkt
);
1870 * Either queue or defer a packet, depending on whether queueing is
1873 static void ssh2_pkt_defer(Ssh ssh
, struct Packet
*pkt
)
1876 ssh2_pkt_queue(ssh
, pkt
);
1878 ssh2_pkt_defer_noqueue(ssh
, pkt
);
1883 * Send the whole deferred data block constructed by
1884 * ssh2_pkt_defer() or SSH-1's defer_packet().
1886 * The expected use of the defer mechanism is that you call
1887 * ssh2_pkt_defer() a few times, then call ssh_pkt_defersend(). If
1888 * not currently queueing, this simply sets up deferred_send_data
1889 * and then sends it. If we _are_ currently queueing, the calls to
1890 * ssh2_pkt_defer() put the deferred packets on to the queue
1891 * instead, and therefore ssh_pkt_defersend() has no deferred data
1892 * to send. Hence, there's no need to make it conditional on
1895 static void ssh_pkt_defersend(Ssh ssh
)
1898 backlog
= sk_write(ssh
->s
, (char *)ssh
->deferred_send_data
,
1900 ssh
->deferred_len
= ssh
->deferred_size
= 0;
1901 sfree(ssh
->deferred_send_data
);
1902 ssh
->deferred_send_data
= NULL
;
1903 if (backlog
> SSH_MAX_BACKLOG
)
1904 ssh_throttle_all(ssh
, 1, backlog
);
1906 ssh
->outgoing_data_size
+= ssh
->deferred_data_size
;
1907 if (!ssh
->kex_in_progress
&&
1908 ssh
->max_data_size
!= 0 &&
1909 ssh
->outgoing_data_size
> ssh
->max_data_size
)
1910 do_ssh2_transport(ssh
, "too much data sent", -1, NULL
);
1911 ssh
->deferred_data_size
= 0;
1915 * Send all queued SSH-2 packets. We send them by means of
1916 * ssh2_pkt_defer_noqueue(), in case they included a pair of
1917 * packets that needed to be lumped together.
1919 static void ssh2_pkt_queuesend(Ssh ssh
)
1923 assert(!ssh
->queueing
);
1925 for (i
= 0; i
< ssh
->queuelen
; i
++)
1926 ssh2_pkt_defer_noqueue(ssh
, ssh
->queue
[i
]);
1929 ssh_pkt_defersend(ssh
);
1933 void bndebug(char *string
, Bignum b
)
1937 p
= ssh2_mpint_fmt(b
, &len
);
1938 debug(("%s", string
));
1939 for (i
= 0; i
< len
; i
++)
1940 debug((" %02x", p
[i
]));
1946 static void sha_mpint(SHA_State
* s
, Bignum b
)
1950 p
= ssh2_mpint_fmt(b
, &len
);
1951 sha_string(s
, p
, len
);
1956 * Packet decode functions for both SSH-1 and SSH-2.
1958 static unsigned long ssh_pkt_getuint32(struct Packet
*pkt
)
1960 unsigned long value
;
1961 if (pkt
->length
- pkt
->savedpos
< 4)
1962 return 0; /* arrgh, no way to decline (FIXME?) */
1963 value
= GET_32BIT(pkt
->body
+ pkt
->savedpos
);
1967 static int ssh2_pkt_getbool(struct Packet
*pkt
)
1969 unsigned long value
;
1970 if (pkt
->length
- pkt
->savedpos
< 1)
1971 return 0; /* arrgh, no way to decline (FIXME?) */
1972 value
= pkt
->body
[pkt
->savedpos
] != 0;
1976 static void ssh_pkt_getstring(struct Packet
*pkt
, char **p
, int *length
)
1981 if (pkt
->length
- pkt
->savedpos
< 4)
1983 len
= GET_32BIT(pkt
->body
+ pkt
->savedpos
);
1988 if (pkt
->length
- pkt
->savedpos
< *length
)
1990 *p
= (char *)(pkt
->body
+ pkt
->savedpos
);
1991 pkt
->savedpos
+= *length
;
1993 static void *ssh_pkt_getdata(struct Packet
*pkt
, int length
)
1995 if (pkt
->length
- pkt
->savedpos
< length
)
1997 pkt
->savedpos
+= length
;
1998 return pkt
->body
+ (pkt
->savedpos
- length
);
2000 static int ssh1_pkt_getrsakey(struct Packet
*pkt
, struct RSAKey
*key
,
2001 unsigned char **keystr
)
2005 j
= makekey(pkt
->body
+ pkt
->savedpos
,
2006 pkt
->length
- pkt
->savedpos
,
2013 assert(pkt
->savedpos
< pkt
->length
);
2017 static Bignum
ssh1_pkt_getmp(struct Packet
*pkt
)
2022 j
= ssh1_read_bignum(pkt
->body
+ pkt
->savedpos
,
2023 pkt
->length
- pkt
->savedpos
, &b
);
2031 static Bignum
ssh2_pkt_getmp(struct Packet
*pkt
)
2037 ssh_pkt_getstring(pkt
, &p
, &length
);
2042 b
= bignum_from_bytes((unsigned char *)p
, length
);
2047 * Helper function to add an SSH-2 signature blob to a packet.
2048 * Expects to be shown the public key blob as well as the signature
2049 * blob. Normally works just like ssh2_pkt_addstring, but will
2050 * fiddle with the signature packet if necessary for
2051 * BUG_SSH2_RSA_PADDING.
2053 static void ssh2_add_sigblob(Ssh ssh
, struct Packet
*pkt
,
2054 void *pkblob_v
, int pkblob_len
,
2055 void *sigblob_v
, int sigblob_len
)
2057 unsigned char *pkblob
= (unsigned char *)pkblob_v
;
2058 unsigned char *sigblob
= (unsigned char *)sigblob_v
;
2060 /* dmemdump(pkblob, pkblob_len); */
2061 /* dmemdump(sigblob, sigblob_len); */
2064 * See if this is in fact an ssh-rsa signature and a buggy
2065 * server; otherwise we can just do this the easy way.
2067 if ((ssh
->remote_bugs
& BUG_SSH2_RSA_PADDING
) &&
2068 (GET_32BIT(pkblob
) == 7 && !memcmp(pkblob
+4, "ssh-rsa", 7))) {
2069 int pos
, len
, siglen
;
2072 * Find the byte length of the modulus.
2075 pos
= 4+7; /* skip over "ssh-rsa" */
2076 pos
+= 4 + GET_32BIT(pkblob
+pos
); /* skip over exponent */
2077 len
= GET_32BIT(pkblob
+pos
); /* find length of modulus */
2078 pos
+= 4; /* find modulus itself */
2079 while (len
> 0 && pkblob
[pos
] == 0)
2081 /* debug(("modulus length is %d\n", len)); */
2084 * Now find the signature integer.
2086 pos
= 4+7; /* skip over "ssh-rsa" */
2087 siglen
= GET_32BIT(sigblob
+pos
);
2088 /* debug(("signature length is %d\n", siglen)); */
2090 if (len
!= siglen
) {
2091 unsigned char newlen
[4];
2092 ssh2_pkt_addstring_start(pkt
);
2093 ssh2_pkt_addstring_data(pkt
, (char *)sigblob
, pos
);
2094 /* dmemdump(sigblob, pos); */
2095 pos
+= 4; /* point to start of actual sig */
2096 PUT_32BIT(newlen
, len
);
2097 ssh2_pkt_addstring_data(pkt
, (char *)newlen
, 4);
2098 /* dmemdump(newlen, 4); */
2100 while (len
-- > siglen
) {
2101 ssh2_pkt_addstring_data(pkt
, (char *)newlen
, 1);
2102 /* dmemdump(newlen, 1); */
2104 ssh2_pkt_addstring_data(pkt
, (char *)(sigblob
+pos
), siglen
);
2105 /* dmemdump(sigblob+pos, siglen); */
2109 /* Otherwise fall through and do it the easy way. */
2112 ssh2_pkt_addstring_start(pkt
);
2113 ssh2_pkt_addstring_data(pkt
, (char *)sigblob
, sigblob_len
);
2117 * Examine the remote side's version string and compare it against
2118 * a list of known buggy implementations.
2120 static void ssh_detect_bugs(Ssh ssh
, char *vstring
)
2122 char *imp
; /* pointer to implementation part */
2124 imp
+= strcspn(imp
, "-");
2126 imp
+= strcspn(imp
, "-");
2129 ssh
->remote_bugs
= 0;
2131 if (ssh
->cfg
.sshbug_ignore1
== FORCE_ON
||
2132 (ssh
->cfg
.sshbug_ignore1
== AUTO
&&
2133 (!strcmp(imp
, "1.2.18") || !strcmp(imp
, "1.2.19") ||
2134 !strcmp(imp
, "1.2.20") || !strcmp(imp
, "1.2.21") ||
2135 !strcmp(imp
, "1.2.22") || !strcmp(imp
, "Cisco-1.25") ||
2136 !strcmp(imp
, "OSU_1.4alpha3") || !strcmp(imp
, "OSU_1.5alpha4")))) {
2138 * These versions don't support SSH1_MSG_IGNORE, so we have
2139 * to use a different defence against password length
2142 ssh
->remote_bugs
|= BUG_CHOKES_ON_SSH1_IGNORE
;
2143 logevent("We believe remote version has SSH-1 ignore bug");
2146 if (ssh
->cfg
.sshbug_plainpw1
== FORCE_ON
||
2147 (ssh
->cfg
.sshbug_plainpw1
== AUTO
&&
2148 (!strcmp(imp
, "Cisco-1.25") || !strcmp(imp
, "OSU_1.4alpha3")))) {
2150 * These versions need a plain password sent; they can't
2151 * handle having a null and a random length of data after
2154 ssh
->remote_bugs
|= BUG_NEEDS_SSH1_PLAIN_PASSWORD
;
2155 logevent("We believe remote version needs a plain SSH-1 password");
2158 if (ssh
->cfg
.sshbug_rsa1
== FORCE_ON
||
2159 (ssh
->cfg
.sshbug_rsa1
== AUTO
&&
2160 (!strcmp(imp
, "Cisco-1.25")))) {
2162 * These versions apparently have no clue whatever about
2163 * RSA authentication and will panic and die if they see
2164 * an AUTH_RSA message.
2166 ssh
->remote_bugs
|= BUG_CHOKES_ON_RSA
;
2167 logevent("We believe remote version can't handle SSH-1 RSA authentication");
2170 if (ssh
->cfg
.sshbug_hmac2
== FORCE_ON
||
2171 (ssh
->cfg
.sshbug_hmac2
== AUTO
&&
2172 !wc_match("* VShell", imp
) &&
2173 (wc_match("2.1.0*", imp
) || wc_match("2.0.*", imp
) ||
2174 wc_match("2.2.0*", imp
) || wc_match("2.3.0*", imp
) ||
2175 wc_match("2.1 *", imp
)))) {
2177 * These versions have the HMAC bug.
2179 ssh
->remote_bugs
|= BUG_SSH2_HMAC
;
2180 logevent("We believe remote version has SSH-2 HMAC bug");
2183 if (ssh
->cfg
.sshbug_derivekey2
== FORCE_ON
||
2184 (ssh
->cfg
.sshbug_derivekey2
== AUTO
&&
2185 !wc_match("* VShell", imp
) &&
2186 (wc_match("2.0.0*", imp
) || wc_match("2.0.10*", imp
) ))) {
2188 * These versions have the key-derivation bug (failing to
2189 * include the literal shared secret in the hashes that
2190 * generate the keys).
2192 ssh
->remote_bugs
|= BUG_SSH2_DERIVEKEY
;
2193 logevent("We believe remote version has SSH-2 key-derivation bug");
2196 if (ssh
->cfg
.sshbug_rsapad2
== FORCE_ON
||
2197 (ssh
->cfg
.sshbug_rsapad2
== AUTO
&&
2198 (wc_match("OpenSSH_2.[5-9]*", imp
) ||
2199 wc_match("OpenSSH_3.[0-2]*", imp
)))) {
2201 * These versions have the SSH-2 RSA padding bug.
2203 ssh
->remote_bugs
|= BUG_SSH2_RSA_PADDING
;
2204 logevent("We believe remote version has SSH-2 RSA padding bug");
2207 if (ssh
->cfg
.sshbug_pksessid2
== FORCE_ON
||
2208 (ssh
->cfg
.sshbug_pksessid2
== AUTO
&&
2209 wc_match("OpenSSH_2.[0-2]*", imp
))) {
2211 * These versions have the SSH-2 session-ID bug in
2212 * public-key authentication.
2214 ssh
->remote_bugs
|= BUG_SSH2_PK_SESSIONID
;
2215 logevent("We believe remote version has SSH-2 public-key-session-ID bug");
2218 if (ssh
->cfg
.sshbug_rekey2
== FORCE_ON
||
2219 (ssh
->cfg
.sshbug_rekey2
== AUTO
&&
2220 (wc_match("OpenSSH_2.[0-4]*", imp
) ||
2221 wc_match("OpenSSH_2.5.[0-3]*", imp
) ||
2222 wc_match("Sun_SSH_1.0", imp
) ||
2223 wc_match("Sun_SSH_1.0.1", imp
)))) {
2225 * These versions have the SSH-2 rekey bug.
2227 ssh
->remote_bugs
|= BUG_SSH2_REKEY
;
2228 logevent("We believe remote version has SSH-2 rekey bug");
2233 * The `software version' part of an SSH version string is required
2234 * to contain no spaces or minus signs.
2236 static void ssh_fix_verstring(char *str
)
2238 /* Eat "SSH-<protoversion>-". */
2239 assert(*str
== 'S'); str
++;
2240 assert(*str
== 'S'); str
++;
2241 assert(*str
== 'H'); str
++;
2242 assert(*str
== '-'); str
++;
2243 while (*str
&& *str
!= '-') str
++;
2244 assert(*str
== '-'); str
++;
2246 /* Convert minus signs and spaces in the remaining string into
2249 if (*str
== '-' || *str
== ' ')
2255 static int do_ssh_init(Ssh ssh
, unsigned char c
)
2257 struct do_ssh_init_state
{
2265 crState(do_ssh_init_state
);
2267 crBegin(ssh
->do_ssh_init_crstate
);
2269 /* Search for the string "SSH-" in the input. */
2272 static const int transS
[] = { 1, 2, 2, 1 };
2273 static const int transH
[] = { 0, 0, 3, 0 };
2274 static const int transminus
[] = { 0, 0, 0, -1 };
2276 s
->i
= transS
[s
->i
];
2278 s
->i
= transH
[s
->i
];
2280 s
->i
= transminus
[s
->i
];
2285 crReturn(1); /* get another character */
2289 s
->vstring
= snewn(s
->vstrsize
, char);
2290 strcpy(s
->vstring
, "SSH-");
2294 crReturn(1); /* get another char */
2295 if (s
->vslen
>= s
->vstrsize
- 1) {
2297 s
->vstring
= sresize(s
->vstring
, s
->vstrsize
, char);
2299 s
->vstring
[s
->vslen
++] = c
;
2302 s
->version
[s
->i
] = '\0';
2304 } else if (s
->i
< sizeof(s
->version
) - 1)
2305 s
->version
[s
->i
++] = c
;
2306 } else if (c
== '\012')
2310 ssh
->agentfwd_enabled
= FALSE
;
2311 ssh
->rdpkt2_state
.incoming_sequence
= 0;
2313 s
->vstring
[s
->vslen
] = 0;
2314 s
->vstring
[strcspn(s
->vstring
, "\015\012")] = '\0';/* remove EOL chars */
2315 logeventf(ssh
, "Server version: %s", s
->vstring
);
2316 ssh_detect_bugs(ssh
, s
->vstring
);
2319 * Decide which SSH protocol version to support.
2322 /* Anything strictly below "2.0" means protocol 1 is supported. */
2323 s
->proto1
= ssh_versioncmp(s
->version
, "2.0") < 0;
2324 /* Anything greater or equal to "1.99" means protocol 2 is supported. */
2325 s
->proto2
= ssh_versioncmp(s
->version
, "1.99") >= 0;
2327 if (ssh
->cfg
.sshprot
== 0 && !s
->proto1
) {
2328 bombout(("SSH protocol version 1 required by user but not provided by server"));
2331 if (ssh
->cfg
.sshprot
== 3 && !s
->proto2
) {
2332 bombout(("SSH protocol version 2 required by user but not provided by server"));
2339 if (s
->proto2
&& (ssh
->cfg
.sshprot
>= 2 || !s
->proto1
)) {
2341 * Construct a v2 version string.
2343 verstring
= dupprintf("SSH-2.0-%s\015\012", sshver
);
2347 * Construct a v1 version string.
2349 verstring
= dupprintf("SSH-%s-%s\012",
2350 (ssh_versioncmp(s
->version
, "1.5") <= 0 ?
2351 s
->version
: "1.5"),
2356 ssh_fix_verstring(verstring
);
2358 if (ssh
->version
== 2) {
2360 * Hash our version string and their version string.
2362 SHA_Init(&ssh
->exhashbase
);
2363 sha_string(&ssh
->exhashbase
, verstring
,
2364 strcspn(verstring
, "\015\012"));
2365 sha_string(&ssh
->exhashbase
, s
->vstring
,
2366 strcspn(s
->vstring
, "\015\012"));
2369 * Initialise SSH-2 protocol.
2371 ssh
->protocol
= ssh2_protocol
;
2372 ssh2_protocol_setup(ssh
);
2373 ssh
->s_rdpkt
= ssh2_rdpkt
;
2376 * Initialise SSH-1 protocol.
2378 ssh
->protocol
= ssh1_protocol
;
2379 ssh1_protocol_setup(ssh
);
2380 ssh
->s_rdpkt
= ssh1_rdpkt
;
2382 logeventf(ssh
, "We claim version: %.*s",
2383 strcspn(verstring
, "\015\012"), verstring
);
2384 sk_write(ssh
->s
, verstring
, strlen(verstring
));
2388 logeventf(ssh
, "Using SSH protocol version %d", ssh
->version
);
2390 update_specials_menu(ssh
->frontend
);
2391 ssh
->state
= SSH_STATE_BEFORE_SIZE
;
2392 ssh
->pinger
= pinger_new(&ssh
->cfg
, &ssh_backend
, ssh
);
2399 static void ssh_process_incoming_data(Ssh ssh
,
2400 unsigned char **data
, int *datalen
)
2402 struct Packet
*pktin
= ssh
->s_rdpkt(ssh
, data
, datalen
);
2404 ssh
->protocol(ssh
, NULL
, 0, pktin
);
2405 ssh_free_packet(pktin
);
2409 static void ssh_queue_incoming_data(Ssh ssh
,
2410 unsigned char **data
, int *datalen
)
2412 bufchain_add(&ssh
->queued_incoming_data
, *data
, *datalen
);
2417 static void ssh_process_queued_incoming_data(Ssh ssh
)
2420 unsigned char *data
;
2423 while (!ssh
->frozen
&& bufchain_size(&ssh
->queued_incoming_data
)) {
2424 bufchain_prefix(&ssh
->queued_incoming_data
, &vdata
, &len
);
2428 while (!ssh
->frozen
&& len
> 0)
2429 ssh_process_incoming_data(ssh
, &data
, &len
);
2432 bufchain_consume(&ssh
->queued_incoming_data
, origlen
- len
);
2436 static void ssh_set_frozen(Ssh ssh
, int frozen
)
2439 sk_set_frozen(ssh
->s
, frozen
);
2440 ssh
->frozen
= frozen
;
2443 static void ssh_gotdata(Ssh ssh
, unsigned char *data
, int datalen
)
2445 crBegin(ssh
->ssh_gotdata_crstate
);
2448 * To begin with, feed the characters one by one to the
2449 * protocol initialisation / selection function do_ssh_init().
2450 * When that returns 0, we're done with the initial greeting
2451 * exchange and can move on to packet discipline.
2454 int ret
; /* need not be kept across crReturn */
2456 crReturnV
; /* more data please */
2457 ret
= do_ssh_init(ssh
, *data
);
2465 * We emerge from that loop when the initial negotiation is
2466 * over and we have selected an s_rdpkt function. Now pass
2467 * everything to s_rdpkt, and then pass the resulting packets
2468 * to the proper protocol handler.
2474 * Process queued data if there is any.
2476 ssh_process_queued_incoming_data(ssh
);
2479 while (datalen
> 0) {
2481 ssh_queue_incoming_data(ssh
, &data
, &datalen
);
2483 ssh_process_incoming_data(ssh
, &data
, &datalen
);
2485 if (ssh
->state
== SSH_STATE_CLOSED
)
2493 static int ssh_do_close(Ssh ssh
, int notify_exit
)
2496 struct ssh_channel
*c
;
2498 ssh
->state
= SSH_STATE_CLOSED
;
2499 expire_timer_context(ssh
);
2504 notify_remote_exit(ssh
->frontend
);
2509 * Now we must shut down any port- and X-forwarded channels going
2510 * through this connection.
2512 if (ssh
->channels
) {
2513 while (NULL
!= (c
= index234(ssh
->channels
, 0))) {
2516 x11_close(c
->u
.x11
.s
);
2519 pfd_close(c
->u
.pfd
.s
);
2522 del234(ssh
->channels
, c
); /* moving next one to index 0 */
2523 if (ssh
->version
== 2)
2524 bufchain_clear(&c
->v
.v2
.outbuffer
);
2529 * Go through port-forwardings, and close any associated
2530 * listening sockets.
2532 if (ssh
->portfwds
) {
2533 struct ssh_portfwd
*pf
;
2534 while (NULL
!= (pf
= index234(ssh
->portfwds
, 0))) {
2535 /* Dispose of any listening socket. */
2537 pfd_terminate(pf
->local
);
2538 del234(ssh
->portfwds
, pf
); /* moving next one to index 0 */
2546 static void ssh_log(Plug plug
, int type
, SockAddr addr
, int port
,
2547 const char *error_msg
, int error_code
)
2549 Ssh ssh
= (Ssh
) plug
;
2550 char addrbuf
[256], *msg
;
2552 sk_getaddr(addr
, addrbuf
, lenof(addrbuf
));
2555 msg
= dupprintf("Connecting to %s port %d", addrbuf
, port
);
2557 msg
= dupprintf("Failed to connect to %s: %s", addrbuf
, error_msg
);
2563 static int ssh_closing(Plug plug
, const char *error_msg
, int error_code
,
2566 Ssh ssh
= (Ssh
) plug
;
2567 int need_notify
= ssh_do_close(ssh
, FALSE
);
2569 if (!error_msg
&& !ssh
->close_expected
) {
2570 error_msg
= "Server unexpectedly closed network connection";
2574 notify_remote_exit(ssh
->frontend
);
2577 /* A socket error has occurred. */
2578 logevent(error_msg
);
2579 connection_fatal(ssh
->frontend
, "%s", error_msg
);
2581 logevent("Server closed network connection");
2586 static int ssh_receive(Plug plug
, int urgent
, char *data
, int len
)
2588 Ssh ssh
= (Ssh
) plug
;
2589 ssh_gotdata(ssh
, (unsigned char *)data
, len
);
2590 if (ssh
->state
== SSH_STATE_CLOSED
) {
2591 ssh_do_close(ssh
, TRUE
);
2597 static void ssh_sent(Plug plug
, int bufsize
)
2599 Ssh ssh
= (Ssh
) plug
;
2601 * If the send backlog on the SSH socket itself clears, we
2602 * should unthrottle the whole world if it was throttled.
2604 if (bufsize
< SSH_MAX_BACKLOG
)
2605 ssh_throttle_all(ssh
, 0, bufsize
);
2609 * Connect to specified host and port.
2610 * Returns an error message, or NULL on success.
2611 * Also places the canonical host name into `realhost'. It must be
2612 * freed by the caller.
2614 static const char *connect_to_host(Ssh ssh
, char *host
, int port
,
2615 char **realhost
, int nodelay
, int keepalive
)
2617 static const struct plug_function_table fn_table
= {
2628 ssh
->savedhost
= snewn(1 + strlen(host
), char);
2629 if (!ssh
->savedhost
)
2630 fatalbox("Out of memory");
2631 strcpy(ssh
->savedhost
, host
);
2634 port
= 22; /* default ssh port */
2635 ssh
->savedport
= port
;
2640 logeventf(ssh
, "Looking up host \"%s\"%s", host
,
2641 (ssh
->cfg
.addressfamily
== ADDRTYPE_IPV4 ?
" (IPv4)" :
2642 (ssh
->cfg
.addressfamily
== ADDRTYPE_IPV6 ?
" (IPv6)" : "")));
2643 addr
= name_lookup(host
, port
, realhost
, &ssh
->cfg
,
2644 ssh
->cfg
.addressfamily
);
2645 if ((err
= sk_addr_error(addr
)) != NULL
) {
2653 ssh
->fn
= &fn_table
;
2654 ssh
->s
= new_connection(addr
, *realhost
, port
,
2655 0, 1, nodelay
, keepalive
, (Plug
) ssh
, &ssh
->cfg
);
2656 if ((err
= sk_socket_error(ssh
->s
)) != NULL
) {
2658 notify_remote_exit(ssh
->frontend
);
2666 * Throttle or unthrottle the SSH connection.
2668 static void ssh1_throttle(Ssh ssh
, int adjust
)
2670 int old_count
= ssh
->v1_throttle_count
;
2671 ssh
->v1_throttle_count
+= adjust
;
2672 assert(ssh
->v1_throttle_count
>= 0);
2673 if (ssh
->v1_throttle_count
&& !old_count
) {
2674 ssh_set_frozen(ssh
, 1);
2675 } else if (!ssh
->v1_throttle_count
&& old_count
) {
2676 ssh_set_frozen(ssh
, 0);
2681 * Throttle or unthrottle _all_ local data streams (for when sends
2682 * on the SSH connection itself back up).
2684 static void ssh_throttle_all(Ssh ssh
, int enable
, int bufsize
)
2687 struct ssh_channel
*c
;
2689 if (enable
== ssh
->throttled_all
)
2691 ssh
->throttled_all
= enable
;
2692 ssh
->overall_bufsize
= bufsize
;
2695 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
2697 case CHAN_MAINSESSION
:
2699 * This is treated separately, outside the switch.
2703 x11_override_throttle(c
->u
.x11
.s
, enable
);
2706 /* Agent channels require no buffer management. */
2709 pfd_override_throttle(c
->u
.pfd
.s
, enable
);
2716 * Username and password input, abstracted off into routines
2717 * reusable in several places - even between SSH-1 and SSH-2.
2720 /* Set up a username or password input loop on a given buffer. */
2721 static void setup_userpass_input(Ssh ssh
, char *buffer
, int buflen
, int echo
)
2723 ssh
->userpass_input_buffer
= buffer
;
2724 ssh
->userpass_input_buflen
= buflen
;
2725 ssh
->userpass_input_bufpos
= 0;
2726 ssh
->userpass_input_echo
= echo
;
2730 * Process some terminal data in the course of username/password
2731 * input. Returns >0 for success (line of input returned in
2732 * buffer), <0 for failure (user hit ^C/^D, bomb out and exit), 0
2733 * for inconclusive (keep waiting for more input please).
2735 static int process_userpass_input(Ssh ssh
, unsigned char *in
, int inlen
)
2740 switch (c
= *in
++) {
2743 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
] = 0;
2744 ssh
->userpass_input_buffer
[ssh
->userpass_input_buflen
-1] = 0;
2749 if (ssh
->userpass_input_bufpos
> 0) {
2750 if (ssh
->userpass_input_echo
)
2751 c_write_str(ssh
, "\b \b");
2752 ssh
->userpass_input_bufpos
--;
2757 while (ssh
->userpass_input_bufpos
> 0) {
2758 if (ssh
->userpass_input_echo
)
2759 c_write_str(ssh
, "\b \b");
2760 ssh
->userpass_input_bufpos
--;
2769 * This simplistic check for printability is disabled
2770 * when we're doing password input, because some people
2771 * have control characters in their passwords.o
2773 if ((!ssh
->userpass_input_echo
||
2774 (c
>= ' ' && c
<= '~') ||
2775 ((unsigned char) c
>= 160))
2776 && ssh
->userpass_input_bufpos
< ssh
->userpass_input_buflen
-1) {
2777 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
++] = c
;
2778 if (ssh
->userpass_input_echo
)
2779 c_write(ssh
, &c
, 1);
2787 static void ssh_agent_callback(void *sshv
, void *reply
, int replylen
)
2789 Ssh ssh
= (Ssh
) sshv
;
2791 ssh
->agent_response
= reply
;
2792 ssh
->agent_response_len
= replylen
;
2794 if (ssh
->version
== 1)
2795 do_ssh1_login(ssh
, NULL
, -1, NULL
);
2797 do_ssh2_authconn(ssh
, NULL
, -1, NULL
);
2800 static void ssh_dialog_callback(void *sshv
, int ret
)
2802 Ssh ssh
= (Ssh
) sshv
;
2804 ssh
->user_response
= ret
;
2806 if (ssh
->version
== 1)
2807 do_ssh1_login(ssh
, NULL
, -1, NULL
);
2809 do_ssh2_transport(ssh
, NULL
, -1, NULL
);
2812 * This may have unfrozen the SSH connection, so do a
2815 ssh_process_queued_incoming_data(ssh
);
2818 static void ssh_agentf_callback(void *cv
, void *reply
, int replylen
)
2820 struct ssh_channel
*c
= (struct ssh_channel
*)cv
;
2822 void *sentreply
= reply
;
2825 /* Fake SSH_AGENT_FAILURE. */
2826 sentreply
= "\0\0\0\1\5";
2829 if (ssh
->version
== 2) {
2830 ssh2_add_channel_data(c
, sentreply
, replylen
);
2833 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
2834 PKT_INT
, c
->remoteid
,
2837 PKT_DATA
, sentreply
, replylen
,
2846 * Handle the key exchange and user authentication phases.
2848 static int do_ssh1_login(Ssh ssh
, unsigned char *in
, int inlen
,
2849 struct Packet
*pktin
)
2852 unsigned char cookie
[8], *ptr
;
2853 struct RSAKey servkey
, hostkey
;
2854 struct MD5Context md5c
;
2855 struct do_ssh1_login_state
{
2857 unsigned char *rsabuf
, *keystr1
, *keystr2
;
2858 unsigned long supported_ciphers_mask
, supported_auths_mask
;
2859 int tried_publickey
, tried_agent
;
2860 int tis_auth_refused
, ccard_auth_refused
;
2861 unsigned char session_id
[16];
2864 void *publickey_blob
;
2865 int publickey_bloblen
;
2871 unsigned char request
[5], *response
, *p
;
2881 crState(do_ssh1_login_state
);
2883 crBegin(ssh
->do_ssh1_login_crstate
);
2888 if (pktin
->type
!= SSH1_SMSG_PUBLIC_KEY
) {
2889 bombout(("Public key packet not received"));
2893 logevent("Received public keys");
2895 ptr
= ssh_pkt_getdata(pktin
, 8);
2897 bombout(("SSH-1 public key packet stopped before random cookie"));
2900 memcpy(cookie
, ptr
, 8);
2902 if (!ssh1_pkt_getrsakey(pktin
, &servkey
, &s
->keystr1
) ||
2903 !ssh1_pkt_getrsakey(pktin
, &hostkey
, &s
->keystr2
)) {
2904 bombout(("Failed to read SSH-1 public keys from public key packet"));
2909 * Log the host key fingerprint.
2913 logevent("Host key fingerprint is:");
2914 strcpy(logmsg
, " ");
2915 hostkey
.comment
= NULL
;
2916 rsa_fingerprint(logmsg
+ strlen(logmsg
),
2917 sizeof(logmsg
) - strlen(logmsg
), &hostkey
);
2921 ssh
->v1_remote_protoflags
= ssh_pkt_getuint32(pktin
);
2922 s
->supported_ciphers_mask
= ssh_pkt_getuint32(pktin
);
2923 s
->supported_auths_mask
= ssh_pkt_getuint32(pktin
);
2925 ssh
->v1_local_protoflags
=
2926 ssh
->v1_remote_protoflags
& SSH1_PROTOFLAGS_SUPPORTED
;
2927 ssh
->v1_local_protoflags
|= SSH1_PROTOFLAG_SCREEN_NUMBER
;
2930 MD5Update(&md5c
, s
->keystr2
, hostkey
.bytes
);
2931 MD5Update(&md5c
, s
->keystr1
, servkey
.bytes
);
2932 MD5Update(&md5c
, cookie
, 8);
2933 MD5Final(s
->session_id
, &md5c
);
2935 for (i
= 0; i
< 32; i
++)
2936 ssh
->session_key
[i
] = random_byte();
2939 * Verify that the `bits' and `bytes' parameters match.
2941 if (hostkey
.bits
> hostkey
.bytes
* 8 ||
2942 servkey
.bits
> servkey
.bytes
* 8) {
2943 bombout(("SSH-1 public keys were badly formatted"));
2947 s
->len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
2949 s
->rsabuf
= snewn(s
->len
, unsigned char);
2951 fatalbox("Out of memory");
2954 * Verify the host key.
2958 * First format the key into a string.
2960 int len
= rsastr_len(&hostkey
);
2961 char fingerprint
[100];
2962 char *keystr
= snewn(len
, char);
2964 fatalbox("Out of memory");
2965 rsastr_fmt(keystr
, &hostkey
);
2966 rsa_fingerprint(fingerprint
, sizeof(fingerprint
), &hostkey
);
2968 ssh_set_frozen(ssh
, 1);
2969 s
->dlgret
= verify_ssh_host_key(ssh
->frontend
,
2970 ssh
->savedhost
, ssh
->savedport
,
2971 "rsa", keystr
, fingerprint
,
2972 ssh_dialog_callback
, ssh
);
2974 if (s
->dlgret
< 0) {
2978 bombout(("Unexpected data from server while waiting"
2979 " for user host key response"));
2982 } while (pktin
|| inlen
> 0);
2983 s
->dlgret
= ssh
->user_response
;
2985 ssh_set_frozen(ssh
, 0);
2987 if (s
->dlgret
== 0) {
2988 ssh
->close_expected
= TRUE
;
2989 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
2994 for (i
= 0; i
< 32; i
++) {
2995 s
->rsabuf
[i
] = ssh
->session_key
[i
];
2997 s
->rsabuf
[i
] ^= s
->session_id
[i
];
3000 if (hostkey
.bytes
> servkey
.bytes
) {
3001 ret
= rsaencrypt(s
->rsabuf
, 32, &servkey
);
3003 ret
= rsaencrypt(s
->rsabuf
, servkey
.bytes
, &hostkey
);
3005 ret
= rsaencrypt(s
->rsabuf
, 32, &hostkey
);
3007 ret
= rsaencrypt(s
->rsabuf
, hostkey
.bytes
, &servkey
);
3010 bombout(("SSH-1 public key encryptions failed due to bad formatting"));
3014 logevent("Encrypted session key");
3017 int cipher_chosen
= 0, warn
= 0;
3018 char *cipher_string
= NULL
;
3020 for (i
= 0; !cipher_chosen
&& i
< CIPHER_MAX
; i
++) {
3021 int next_cipher
= ssh
->cfg
.ssh_cipherlist
[i
];
3022 if (next_cipher
== CIPHER_WARN
) {
3023 /* If/when we choose a cipher, warn about it */
3025 } else if (next_cipher
== CIPHER_AES
) {
3026 /* XXX Probably don't need to mention this. */
3027 logevent("AES not supported in SSH-1, skipping");
3029 switch (next_cipher
) {
3030 case CIPHER_3DES
: s
->cipher_type
= SSH_CIPHER_3DES
;
3031 cipher_string
= "3DES"; break;
3032 case CIPHER_BLOWFISH
: s
->cipher_type
= SSH_CIPHER_BLOWFISH
;
3033 cipher_string
= "Blowfish"; break;
3034 case CIPHER_DES
: s
->cipher_type
= SSH_CIPHER_DES
;
3035 cipher_string
= "single-DES"; break;
3037 if (s
->supported_ciphers_mask
& (1 << s
->cipher_type
))
3041 if (!cipher_chosen
) {
3042 if ((s
->supported_ciphers_mask
& (1 << SSH_CIPHER_3DES
)) == 0)
3043 bombout(("Server violates SSH-1 protocol by not "
3044 "supporting 3DES encryption"));
3046 /* shouldn't happen */
3047 bombout(("No supported ciphers found"));
3051 /* Warn about chosen cipher if necessary. */
3053 ssh_set_frozen(ssh
, 1);
3054 s
->dlgret
= askalg(ssh
->frontend
, "cipher", cipher_string
,
3055 ssh_dialog_callback
, ssh
);
3056 if (s
->dlgret
< 0) {
3060 bombout(("Unexpected data from server while waiting"
3061 " for user response"));
3064 } while (pktin
|| inlen
> 0);
3065 s
->dlgret
= ssh
->user_response
;
3067 ssh_set_frozen(ssh
, 0);
3068 if (s
->dlgret
== 0) {
3069 ssh
->close_expected
= TRUE
;
3070 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
3076 switch (s
->cipher_type
) {
3077 case SSH_CIPHER_3DES
:
3078 logevent("Using 3DES encryption");
3080 case SSH_CIPHER_DES
:
3081 logevent("Using single-DES encryption");
3083 case SSH_CIPHER_BLOWFISH
:
3084 logevent("Using Blowfish encryption");
3088 send_packet(ssh
, SSH1_CMSG_SESSION_KEY
,
3089 PKT_CHAR
, s
->cipher_type
,
3090 PKT_DATA
, cookie
, 8,
3091 PKT_CHAR
, (s
->len
* 8) >> 8, PKT_CHAR
, (s
->len
* 8) & 0xFF,
3092 PKT_DATA
, s
->rsabuf
, s
->len
,
3093 PKT_INT
, ssh
->v1_local_protoflags
, PKT_END
);
3095 logevent("Trying to enable encryption...");
3099 ssh
->cipher
= (s
->cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish_ssh1
:
3100 s
->cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
3102 ssh
->v1_cipher_ctx
= ssh
->cipher
->make_context();
3103 ssh
->cipher
->sesskey(ssh
->v1_cipher_ctx
, ssh
->session_key
);
3104 logeventf(ssh
, "Initialised %s encryption", ssh
->cipher
->text_name
);
3106 ssh
->crcda_ctx
= crcda_make_context();
3107 logevent("Installing CRC compensation attack detector");
3109 if (servkey
.modulus
) {
3110 sfree(servkey
.modulus
);
3111 servkey
.modulus
= NULL
;
3113 if (servkey
.exponent
) {
3114 sfree(servkey
.exponent
);
3115 servkey
.exponent
= NULL
;
3117 if (hostkey
.modulus
) {
3118 sfree(hostkey
.modulus
);
3119 hostkey
.modulus
= NULL
;
3121 if (hostkey
.exponent
) {
3122 sfree(hostkey
.exponent
);
3123 hostkey
.exponent
= NULL
;
3127 if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
3128 bombout(("Encryption not successfully enabled"));
3132 logevent("Successfully started encryption");
3136 if (!*ssh
->cfg
.username
) {
3137 if (ssh_get_line
&& !ssh_getline_pw_only
) {
3138 if (!ssh_get_line("login as: ",
3139 s
->username
, sizeof(s
->username
), FALSE
)) {
3141 * get_line failed to get a username.
3144 logevent("No username provided. Abandoning session.");
3145 ssh
->close_expected
= TRUE
;
3146 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
3150 int ret
; /* need not be kept over crReturn */
3151 c_write_str(ssh
, "login as: ");
3154 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
3156 crWaitUntil(!pktin
);
3157 ret
= process_userpass_input(ssh
, in
, inlen
);
3161 c_write_str(ssh
, "\r\n");
3164 strncpy(s
->username
, ssh
->cfg
.username
, sizeof(s
->username
));
3165 s
->username
[sizeof(s
->username
)-1] = '\0';
3168 send_packet(ssh
, SSH1_CMSG_USER
, PKT_STR
, s
->username
, PKT_END
);
3170 char userlog
[22 + sizeof(s
->username
)];
3171 sprintf(userlog
, "Sent username \"%s\"", s
->username
);
3173 if (flags
& FLAG_INTERACTIVE
&&
3174 (!((flags
& FLAG_STDERR
) && (flags
& FLAG_VERBOSE
)))) {
3175 strcat(userlog
, "\r\n");
3176 c_write_str(ssh
, userlog
);
3183 if ((ssh
->remote_bugs
& BUG_CHOKES_ON_RSA
)) {
3184 /* We must not attempt PK auth. Pretend we've already tried it. */
3185 s
->tried_publickey
= s
->tried_agent
= 1;
3187 s
->tried_publickey
= s
->tried_agent
= 0;
3189 s
->tis_auth_refused
= s
->ccard_auth_refused
= 0;
3190 /* Load the public half of ssh->cfg.keyfile so we notice if it's in Pageant */
3191 if (!filename_is_null(ssh
->cfg
.keyfile
)) {
3192 if (!rsakey_pubblob(&ssh
->cfg
.keyfile
,
3193 &s
->publickey_blob
, &s
->publickey_bloblen
, NULL
))
3194 s
->publickey_blob
= NULL
;
3196 s
->publickey_blob
= NULL
;
3198 while (pktin
->type
== SSH1_SMSG_FAILURE
) {
3199 s
->pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
3201 if (agent_exists() && !s
->tried_agent
) {
3203 * Attempt RSA authentication using Pageant.
3209 logevent("Pageant is running. Requesting keys.");
3211 /* Request the keys held by the agent. */
3212 PUT_32BIT(s
->request
, 1);
3213 s
->request
[4] = SSH1_AGENTC_REQUEST_RSA_IDENTITIES
;
3214 if (!agent_query(s
->request
, 5, &r
, &s
->responselen
,
3215 ssh_agent_callback
, ssh
)) {
3219 bombout(("Unexpected data from server while waiting"
3220 " for agent response"));
3223 } while (pktin
|| inlen
> 0);
3224 r
= ssh
->agent_response
;
3225 s
->responselen
= ssh
->agent_response_len
;
3227 s
->response
= (unsigned char *) r
;
3228 if (s
->response
&& s
->responselen
>= 5 &&
3229 s
->response
[4] == SSH1_AGENT_RSA_IDENTITIES_ANSWER
) {
3230 s
->p
= s
->response
+ 5;
3231 s
->nkeys
= GET_32BIT(s
->p
);
3233 logeventf(ssh
, "Pageant has %d SSH-1 keys", s
->nkeys
);
3234 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
3235 logeventf(ssh
, "Trying Pageant key #%d", s
->keyi
);
3236 if (s
->publickey_blob
&&
3237 !memcmp(s
->p
, s
->publickey_blob
,
3238 s
->publickey_bloblen
)) {
3239 logevent("This key matches configured key file");
3240 s
->tried_publickey
= 1;
3245 do { /* do while (0) to make breaking easy */
3246 n
= ssh1_read_bignum
3247 (s
->p
, s
->responselen
-(s
->p
-s
->response
),
3252 n
= ssh1_read_bignum
3253 (s
->p
, s
->responselen
-(s
->p
-s
->response
),
3258 if (s
->responselen
- (s
->p
-s
->response
) < 4)
3260 s
->commentlen
= GET_32BIT(s
->p
);
3262 if (s
->responselen
- (s
->p
-s
->response
) <
3265 s
->commentp
= (char *)s
->p
;
3266 s
->p
+= s
->commentlen
;
3270 logevent("Pageant key list packet was truncated");
3274 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
3275 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
3277 if (pktin
->type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
3278 logevent("Key refused");
3281 logevent("Received RSA challenge");
3282 if ((s
->challenge
= ssh1_pkt_getmp(pktin
)) == NULL
) {
3283 bombout(("Server's RSA challenge was badly formatted"));
3288 char *agentreq
, *q
, *ret
;
3291 len
= 1 + 4; /* message type, bit count */
3292 len
+= ssh1_bignum_length(s
->key
.exponent
);
3293 len
+= ssh1_bignum_length(s
->key
.modulus
);
3294 len
+= ssh1_bignum_length(s
->challenge
);
3295 len
+= 16; /* session id */
3296 len
+= 4; /* response format */
3297 agentreq
= snewn(4 + len
, char);
3298 PUT_32BIT(agentreq
, len
);
3300 *q
++ = SSH1_AGENTC_RSA_CHALLENGE
;
3301 PUT_32BIT(q
, bignum_bitcount(s
->key
.modulus
));
3303 q
+= ssh1_write_bignum(q
, s
->key
.exponent
);
3304 q
+= ssh1_write_bignum(q
, s
->key
.modulus
);
3305 q
+= ssh1_write_bignum(q
, s
->challenge
);
3306 memcpy(q
, s
->session_id
, 16);
3308 PUT_32BIT(q
, 1); /* response format */
3309 if (!agent_query(agentreq
, len
+ 4, &vret
, &retlen
,
3310 ssh_agent_callback
, ssh
)) {
3315 bombout(("Unexpected data from server"
3316 " while waiting for agent"
3320 } while (pktin
|| inlen
> 0);
3321 vret
= ssh
->agent_response
;
3322 retlen
= ssh
->agent_response_len
;
3327 if (ret
[4] == SSH1_AGENT_RSA_RESPONSE
) {
3328 logevent("Sending Pageant's response");
3329 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
3330 PKT_DATA
, ret
+ 5, 16,
3334 if (pktin
->type
== SSH1_SMSG_SUCCESS
) {
3336 ("Pageant's response accepted");
3337 if (flags
& FLAG_VERBOSE
) {
3338 c_write_str(ssh
, "Authenticated using"
3340 c_write(ssh
, s
->commentp
,
3342 c_write_str(ssh
, "\" from agent\r\n");
3347 ("Pageant's response not accepted");
3350 ("Pageant failed to answer challenge");
3354 logevent("No reply received from Pageant");
3357 freebn(s
->key
.exponent
);
3358 freebn(s
->key
.modulus
);
3359 freebn(s
->challenge
);
3368 if (!filename_is_null(ssh
->cfg
.keyfile
) && !s
->tried_publickey
)
3369 s
->pwpkt_type
= SSH1_CMSG_AUTH_RSA
;
3371 if (ssh
->cfg
.try_tis_auth
&&
3372 (s
->supported_auths_mask
& (1 << SSH1_AUTH_TIS
)) &&
3373 !s
->tis_auth_refused
) {
3374 s
->pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
3375 logevent("Requested TIS authentication");
3376 send_packet(ssh
, SSH1_CMSG_AUTH_TIS
, PKT_END
);
3378 if (pktin
->type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
3379 logevent("TIS authentication declined");
3380 if (flags
& FLAG_INTERACTIVE
)
3381 c_write_str(ssh
, "TIS authentication refused.\r\n");
3382 s
->tis_auth_refused
= 1;
3388 ssh_pkt_getstring(pktin
, &challenge
, &challengelen
);
3390 bombout(("TIS challenge packet was badly formed"));
3393 c_write_str(ssh
, "Using TIS authentication.\r\n");
3394 logevent("Received TIS challenge");
3395 if (challengelen
> sizeof(s
->prompt
) - 1)
3396 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
3397 memcpy(s
->prompt
, challenge
, challengelen
);
3398 /* Prompt heuristic comes from OpenSSH */
3399 strncpy(s
->prompt
+ challengelen
,
3400 memchr(s
->prompt
, '\n', challengelen
) ?
3401 "": "\r\nResponse: ",
3402 (sizeof s
->prompt
) - challengelen
);
3403 s
->prompt
[(sizeof s
->prompt
) - 1] = '\0';
3406 if (ssh
->cfg
.try_tis_auth
&&
3407 (s
->supported_auths_mask
& (1 << SSH1_AUTH_CCARD
)) &&
3408 !s
->ccard_auth_refused
) {
3409 s
->pwpkt_type
= SSH1_CMSG_AUTH_CCARD_RESPONSE
;
3410 logevent("Requested CryptoCard authentication");
3411 send_packet(ssh
, SSH1_CMSG_AUTH_CCARD
, PKT_END
);
3413 if (pktin
->type
!= SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
3414 logevent("CryptoCard authentication declined");
3415 c_write_str(ssh
, "CryptoCard authentication refused.\r\n");
3416 s
->ccard_auth_refused
= 1;
3422 ssh_pkt_getstring(pktin
, &challenge
, &challengelen
);
3424 bombout(("CryptoCard challenge packet was badly formed"));
3427 c_write_str(ssh
, "Using CryptoCard authentication.\r\n");
3428 logevent("Received CryptoCard challenge");
3429 if (challengelen
> sizeof(s
->prompt
) - 1)
3430 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
3431 memcpy(s
->prompt
, challenge
, challengelen
);
3432 strncpy(s
->prompt
+ challengelen
,
3433 memchr(s
->prompt
, '\n', challengelen
) ?
3434 "" : "\r\nResponse: ",
3435 sizeof(s
->prompt
) - challengelen
);
3436 s
->prompt
[sizeof(s
->prompt
) - 1] = '\0';
3439 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
3440 sprintf(s
->prompt
, "%.90s@%.90s's password: ",
3441 s
->username
, ssh
->savedhost
);
3443 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
3444 char *comment
= NULL
;
3446 if (flags
& FLAG_VERBOSE
)
3447 c_write_str(ssh
, "Trying public key authentication.\r\n");
3448 logeventf(ssh
, "Trying public key \"%s\"",
3449 filename_to_str(&ssh
->cfg
.keyfile
));
3450 type
= key_type(&ssh
->cfg
.keyfile
);
3451 if (type
!= SSH_KEYTYPE_SSH1
) {
3452 char *msg
= dupprintf("Key is of wrong type (%s)",
3453 key_type_to_str(type
));
3455 c_write_str(ssh
, msg
);
3456 c_write_str(ssh
, "\r\n");
3458 s
->tried_publickey
= 1;
3461 if (!rsakey_encrypted(&ssh
->cfg
.keyfile
, &comment
)) {
3462 if (flags
& FLAG_VERBOSE
)
3463 c_write_str(ssh
, "No passphrase required.\r\n");
3466 sprintf(s
->prompt
, "Passphrase for key \"%.100s\": ", comment
);
3471 * Show password prompt, having first obtained it via a TIS
3472 * or CryptoCard exchange if we're doing TIS or CryptoCard
3476 if (!ssh_get_line(s
->prompt
, s
->password
,
3477 sizeof(s
->password
), TRUE
)) {
3479 * get_line failed to get a password (for example
3480 * because one was supplied on the command line
3481 * which has already failed to work). Terminate.
3483 send_packet(ssh
, SSH1_MSG_DISCONNECT
,
3484 PKT_STR
, "No more passwords available to try",
3486 logevent("Unable to authenticate");
3487 connection_fatal(ssh
->frontend
, "Unable to authenticate");
3488 ssh
->close_expected
= TRUE
;
3489 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
3493 /* Prompt may have come from server. We've munged it a bit, so
3494 * we know it to be zero-terminated at least once. */
3495 int ret
; /* need not be saved over crReturn */
3496 c_write_untrusted(ssh
, s
->prompt
, strlen(s
->prompt
));
3499 setup_userpass_input(ssh
, s
->password
, sizeof(s
->password
), 0);
3501 crWaitUntil(!pktin
);
3502 ret
= process_userpass_input(ssh
, in
, inlen
);
3506 c_write_str(ssh
, "\r\n");
3510 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
3512 * Try public key authentication with the specified
3515 s
->tried_publickey
= 1;
3518 const char *error
= NULL
;
3519 int ret
= loadrsakey(&ssh
->cfg
.keyfile
, &s
->key
, s
->password
,
3522 c_write_str(ssh
, "Couldn't load private key from ");
3523 c_write_str(ssh
, filename_to_str(&ssh
->cfg
.keyfile
));
3524 c_write_str(ssh
, " (");
3525 c_write_str(ssh
, error
);
3526 c_write_str(ssh
, ").\r\n");
3527 continue; /* go and try password */
3530 c_write_str(ssh
, "Wrong passphrase.\r\n");
3531 s
->tried_publickey
= 0;
3532 continue; /* try again */
3537 * Send a public key attempt.
3539 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
3540 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
3543 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3544 c_write_str(ssh
, "Server refused our public key.\r\n");
3545 continue; /* go and try password */
3547 if (pktin
->type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
3548 bombout(("Bizarre response to offer of public key"));
3554 unsigned char buffer
[32];
3555 Bignum challenge
, response
;
3557 if ((challenge
= ssh1_pkt_getmp(pktin
)) == NULL
) {
3558 bombout(("Server's RSA challenge was badly formatted"));
3561 response
= rsadecrypt(challenge
, &s
->key
);
3562 freebn(s
->key
.private_exponent
);/* burn the evidence */
3564 for (i
= 0; i
< 32; i
++) {
3565 buffer
[i
] = bignum_byte(response
, 31 - i
);
3569 MD5Update(&md5c
, buffer
, 32);
3570 MD5Update(&md5c
, s
->session_id
, 16);
3571 MD5Final(buffer
, &md5c
);
3573 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
3574 PKT_DATA
, buffer
, 16, PKT_END
);
3581 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3582 if (flags
& FLAG_VERBOSE
)
3583 c_write_str(ssh
, "Failed to authenticate with"
3584 " our public key.\r\n");
3585 continue; /* go and try password */
3586 } else if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
3587 bombout(("Bizarre response to RSA authentication response"));
3591 break; /* we're through! */
3593 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
3595 * Defence against traffic analysis: we send a
3596 * whole bunch of packets containing strings of
3597 * different lengths. One of these strings is the
3598 * password, in a SSH1_CMSG_AUTH_PASSWORD packet.
3599 * The others are all random data in
3600 * SSH1_MSG_IGNORE packets. This way a passive
3601 * listener can't tell which is the password, and
3602 * hence can't deduce the password length.
3604 * Anybody with a password length greater than 16
3605 * bytes is going to have enough entropy in their
3606 * password that a listener won't find it _that_
3607 * much help to know how long it is. So what we'll
3610 * - if password length < 16, we send 15 packets
3611 * containing string lengths 1 through 15
3613 * - otherwise, we let N be the nearest multiple
3614 * of 8 below the password length, and send 8
3615 * packets containing string lengths N through
3616 * N+7. This won't obscure the order of
3617 * magnitude of the password length, but it will
3618 * introduce a bit of extra uncertainty.
3620 * A few servers (the old 1.2.18 through 1.2.22)
3621 * can't deal with SSH1_MSG_IGNORE. For these
3622 * servers, we need an alternative defence. We make
3623 * use of the fact that the password is interpreted
3624 * as a C string: so we can append a NUL, then some
3627 * One server (a Cisco one) can deal with neither
3628 * SSH1_MSG_IGNORE _nor_ a padded password string.
3629 * For this server we are left with no defences
3630 * against password length sniffing.
3632 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
)) {
3634 * The server can deal with SSH1_MSG_IGNORE, so
3635 * we can use the primary defence.
3637 int bottom
, top
, pwlen
, i
;
3640 pwlen
= strlen(s
->password
);
3642 bottom
= 0; /* zero length passwords are OK! :-) */
3645 bottom
= pwlen
& ~7;
3649 assert(pwlen
>= bottom
&& pwlen
<= top
);
3651 randomstr
= snewn(top
+ 1, char);
3653 for (i
= bottom
; i
<= top
; i
++) {
3655 defer_packet(ssh
, s
->pwpkt_type
,
3656 PKTT_PASSWORD
, PKT_STR
, s
->password
,
3657 PKTT_OTHER
, PKT_END
);
3659 for (j
= 0; j
< i
; j
++) {
3661 randomstr
[j
] = random_byte();
3662 } while (randomstr
[j
] == '\0');
3664 randomstr
[i
] = '\0';
3665 defer_packet(ssh
, SSH1_MSG_IGNORE
,
3666 PKT_STR
, randomstr
, PKT_END
);
3669 logevent("Sending password with camouflage packets");
3670 ssh_pkt_defersend(ssh
);
3673 else if (!(ssh
->remote_bugs
& BUG_NEEDS_SSH1_PLAIN_PASSWORD
)) {
3675 * The server can't deal with SSH1_MSG_IGNORE
3676 * but can deal with padded passwords, so we
3677 * can use the secondary defence.
3683 len
= strlen(s
->password
);
3684 if (len
< sizeof(string
)) {
3686 strcpy(string
, s
->password
);
3687 len
++; /* cover the zero byte */
3688 while (len
< sizeof(string
)) {
3689 string
[len
++] = (char) random_byte();
3694 logevent("Sending length-padded password");
3695 send_packet(ssh
, s
->pwpkt_type
, PKTT_PASSWORD
,
3696 PKT_INT
, len
, PKT_DATA
, ss
, len
,
3697 PKTT_OTHER
, PKT_END
);
3700 * The server has _both_
3701 * BUG_CHOKES_ON_SSH1_IGNORE and
3702 * BUG_NEEDS_SSH1_PLAIN_PASSWORD. There is
3703 * therefore nothing we can do.
3706 len
= strlen(s
->password
);
3707 logevent("Sending unpadded password");
3708 send_packet(ssh
, s
->pwpkt_type
,
3709 PKTT_PASSWORD
, PKT_INT
, len
,
3710 PKT_DATA
, s
->password
, len
,
3711 PKTT_OTHER
, PKT_END
);
3714 send_packet(ssh
, s
->pwpkt_type
, PKTT_PASSWORD
,
3715 PKT_STR
, s
->password
, PKTT_OTHER
, PKT_END
);
3718 logevent("Sent password");
3719 memset(s
->password
, 0, strlen(s
->password
));
3721 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3722 if (flags
& FLAG_VERBOSE
)
3723 c_write_str(ssh
, "Access denied\r\n");
3724 logevent("Authentication refused");
3725 } else if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
3726 bombout(("Strange packet received, type %d", pktin
->type
));
3731 logevent("Authentication successful");
3736 void sshfwd_close(struct ssh_channel
*c
)
3740 if (ssh
->state
== SSH_STATE_CLOSED
)
3743 if (c
&& !c
->closes
) {
3745 * If halfopen is true, we have sent
3746 * CHANNEL_OPEN for this channel, but it hasn't even been
3747 * acknowledged by the server. So we must set a close flag
3748 * on it now, and then when the server acks the channel
3749 * open, we can close it then.
3752 if (ssh
->version
== 1) {
3753 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
, PKT_INT
, c
->remoteid
,
3756 struct Packet
*pktout
;
3757 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
3758 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
3759 ssh2_pkt_send(ssh
, pktout
);
3762 c
->closes
= 1; /* sent MSG_CLOSE */
3763 if (c
->type
== CHAN_X11
) {
3765 logevent("Forwarded X11 connection terminated");
3766 } else if (c
->type
== CHAN_SOCKDATA
||
3767 c
->type
== CHAN_SOCKDATA_DORMANT
) {
3769 logevent("Forwarded port closed");
3774 int sshfwd_write(struct ssh_channel
*c
, char *buf
, int len
)
3778 if (ssh
->state
== SSH_STATE_CLOSED
)
3781 if (ssh
->version
== 1) {
3782 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
3783 PKT_INT
, c
->remoteid
,
3785 PKT_INT
, len
, PKT_DATA
, buf
, len
,
3786 PKTT_OTHER
, PKT_END
);
3788 * In SSH-1 we can return 0 here - implying that forwarded
3789 * connections are never individually throttled - because
3790 * the only circumstance that can cause throttling will be
3791 * the whole SSH connection backing up, in which case
3792 * _everything_ will be throttled as a whole.
3796 ssh2_add_channel_data(c
, buf
, len
);
3797 return ssh2_try_send(c
);
3801 void sshfwd_unthrottle(struct ssh_channel
*c
, int bufsize
)
3805 if (ssh
->state
== SSH_STATE_CLOSED
)
3808 if (ssh
->version
== 1) {
3809 if (c
->v
.v1
.throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
3810 c
->v
.v1
.throttling
= 0;
3811 ssh1_throttle(ssh
, -1);
3814 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
3818 static void ssh_queueing_handler(Ssh ssh
, struct Packet
*pktin
)
3820 struct queued_handler
*qh
= ssh
->qhead
;
3824 assert(pktin
->type
== qh
->msg1
|| pktin
->type
== qh
->msg2
);
3827 assert(ssh
->packet_dispatch
[qh
->msg1
] == ssh_queueing_handler
);
3828 ssh
->packet_dispatch
[qh
->msg1
] = NULL
;
3831 assert(ssh
->packet_dispatch
[qh
->msg2
] == ssh_queueing_handler
);
3832 ssh
->packet_dispatch
[qh
->msg2
] = NULL
;
3836 ssh
->qhead
= qh
->next
;
3838 if (ssh
->qhead
->msg1
> 0) {
3839 assert(ssh
->packet_dispatch
[ssh
->qhead
->msg1
] == NULL
);
3840 ssh
->packet_dispatch
[ssh
->qhead
->msg1
] = ssh_queueing_handler
;
3842 if (ssh
->qhead
->msg2
> 0) {
3843 assert(ssh
->packet_dispatch
[ssh
->qhead
->msg2
] == NULL
);
3844 ssh
->packet_dispatch
[ssh
->qhead
->msg2
] = ssh_queueing_handler
;
3847 ssh
->qhead
= ssh
->qtail
= NULL
;
3848 ssh
->packet_dispatch
[pktin
->type
] = NULL
;
3851 qh
->handler(ssh
, pktin
, qh
->ctx
);
3856 static void ssh_queue_handler(Ssh ssh
, int msg1
, int msg2
,
3857 chandler_fn_t handler
, void *ctx
)
3859 struct queued_handler
*qh
;
3861 qh
= snew(struct queued_handler
);
3864 qh
->handler
= handler
;
3868 if (ssh
->qtail
== NULL
) {
3872 assert(ssh
->packet_dispatch
[qh
->msg1
] == NULL
);
3873 ssh
->packet_dispatch
[qh
->msg1
] = ssh_queueing_handler
;
3876 assert(ssh
->packet_dispatch
[qh
->msg2
] == NULL
);
3877 ssh
->packet_dispatch
[qh
->msg2
] = ssh_queueing_handler
;
3880 ssh
->qtail
->next
= qh
;
3885 static void ssh_rportfwd_succfail(Ssh ssh
, struct Packet
*pktin
, void *ctx
)
3887 struct ssh_rportfwd
*rpf
, *pf
= (struct ssh_rportfwd
*)ctx
;
3889 if (pktin
->type
== (ssh
->version
== 1 ? SSH1_SMSG_SUCCESS
:
3890 SSH2_MSG_REQUEST_SUCCESS
)) {
3891 logeventf(ssh
, "Remote port forwarding from %s enabled",
3894 logeventf(ssh
, "Remote port forwarding from %s refused",
3897 rpf
= del234(ssh
->rportfwds
, pf
);
3903 static void ssh_setup_portfwd(Ssh ssh
, const Config
*cfg
)
3905 const char *portfwd_strptr
= cfg
->portfwd
;
3906 struct ssh_portfwd
*epf
;
3909 if (!ssh
->portfwds
) {
3910 ssh
->portfwds
= newtree234(ssh_portcmp
);
3913 * Go through the existing port forwardings and tag them
3914 * with status==DESTROY. Any that we want to keep will be
3915 * re-enabled (status==KEEP) as we go through the
3916 * configuration and find out which bits are the same as
3919 struct ssh_portfwd
*epf
;
3921 for (i
= 0; (epf
= index234(ssh
->portfwds
, i
)) != NULL
; i
++)
3922 epf
->status
= DESTROY
;
3925 while (*portfwd_strptr
) {
3926 char address_family
, type
;
3927 int sport
,dport
,sserv
,dserv
;
3928 char sports
[256], dports
[256], saddr
[256], host
[256];
3931 address_family
= 'A';
3933 if (*portfwd_strptr
== 'A' ||
3934 *portfwd_strptr
== '4' ||
3935 *portfwd_strptr
== '6')
3936 address_family
= *portfwd_strptr
++;
3937 if (*portfwd_strptr
== 'L' ||
3938 *portfwd_strptr
== 'R' ||
3939 *portfwd_strptr
== 'D')
3940 type
= *portfwd_strptr
++;
3945 while (*portfwd_strptr
&& *portfwd_strptr
!= '\t') {
3946 if (*portfwd_strptr
== ':') {
3948 * We've seen a colon in the middle of the
3949 * source port number. This means that
3950 * everything we've seen until now is the
3951 * source _address_, so we'll move it into
3952 * saddr and start sports from the beginning
3957 if (ssh
->version
== 1 && type
== 'R') {
3958 logeventf(ssh
, "SSH-1 cannot handle remote source address "
3959 "spec \"%s\"; ignoring", sports
);
3961 strcpy(saddr
, sports
);
3964 if (n
< lenof(sports
)-1) sports
[n
++] = *portfwd_strptr
++;
3968 if (*portfwd_strptr
== '\t')
3971 while (*portfwd_strptr
&& *portfwd_strptr
!= ':') {
3972 if (n
< lenof(host
)-1) host
[n
++] = *portfwd_strptr
++;
3975 if (*portfwd_strptr
== ':')
3978 while (*portfwd_strptr
) {
3979 if (n
< lenof(dports
)-1) dports
[n
++] = *portfwd_strptr
++;
3983 dport
= atoi(dports
);
3987 dport
= net_service_lookup(dports
);
3989 logeventf(ssh
, "Service lookup failed for destination"
3990 " port \"%s\"", dports
);
3994 while (*portfwd_strptr
) portfwd_strptr
++;
3998 portfwd_strptr
++; /* eat the NUL and move to next one */
4000 sport
= atoi(sports
);
4004 sport
= net_service_lookup(sports
);
4006 logeventf(ssh
, "Service lookup failed for source"
4007 " port \"%s\"", sports
);
4010 if (sport
&& dport
) {
4011 /* Set up a description of the source port. */
4012 struct ssh_portfwd
*pfrec
, *epfrec
;
4014 pfrec
= snew(struct ssh_portfwd
);
4016 pfrec
->saddr
= *saddr ?
dupstr(saddr
) : NULL
;
4017 pfrec
->sserv
= sserv ?
dupstr(sports
) : NULL
;
4018 pfrec
->sport
= sport
;
4019 pfrec
->daddr
= *host ?
dupstr(host
) : NULL
;
4020 pfrec
->dserv
= dserv ?
dupstr(dports
) : NULL
;
4021 pfrec
->dport
= dport
;
4022 pfrec
->local
= NULL
;
4023 pfrec
->remote
= NULL
;
4024 pfrec
->addressfamily
= (address_family
== '4' ? ADDRTYPE_IPV4
:
4025 address_family
== '6' ? ADDRTYPE_IPV6
:
4028 epfrec
= add234(ssh
->portfwds
, pfrec
);
4029 if (epfrec
!= pfrec
) {
4031 * We already have a port forwarding with precisely
4032 * these parameters. Hence, no need to do anything;
4033 * simply tag the existing one as KEEP.
4035 epfrec
->status
= KEEP
;
4036 free_portfwd(pfrec
);
4038 pfrec
->status
= CREATE
;
4044 * Now go through and destroy any port forwardings which were
4047 for (i
= 0; (epf
= index234(ssh
->portfwds
, i
)) != NULL
; i
++)
4048 if (epf
->status
== DESTROY
) {
4051 message
= dupprintf("%s port forwarding from %s%s%d",
4052 epf
->type
== 'L' ?
"local" :
4053 epf
->type
== 'R' ?
"remote" : "dynamic",
4054 epf
->saddr ? epf
->saddr
: "",
4055 epf
->saddr ?
":" : "",
4058 if (epf
->type
!= 'D') {
4059 char *msg2
= dupprintf("%s to %s:%d", message
,
4060 epf
->daddr
, epf
->dport
);
4065 logeventf(ssh
, "Cancelling %s", message
);
4069 struct ssh_rportfwd
*rpf
= epf
->remote
;
4070 struct Packet
*pktout
;
4073 * Cancel the port forwarding at the server
4076 if (ssh
->version
== 1) {
4078 * We cannot cancel listening ports on the
4079 * server side in SSH-1! There's no message
4080 * to support it. Instead, we simply remove
4081 * the rportfwd record from the local end
4082 * so that any connections the server tries
4083 * to make on it are rejected.
4086 pktout
= ssh2_pkt_init(SSH2_MSG_GLOBAL_REQUEST
);
4087 ssh2_pkt_addstring(pktout
, "cancel-tcpip-forward");
4088 ssh2_pkt_addbool(pktout
, 0);/* _don't_ want reply */
4090 ssh2_pkt_addstring(pktout
, epf
->saddr
);
4091 } else if (ssh
->cfg
.rport_acceptall
) {
4092 /* XXX: ssh->cfg.rport_acceptall may not represent
4093 * what was used to open the original connection,
4094 * since it's reconfigurable. */
4095 ssh2_pkt_addstring(pktout
, "0.0.0.0");
4097 ssh2_pkt_addstring(pktout
, "127.0.0.1");
4099 ssh2_pkt_adduint32(pktout
, epf
->sport
);
4100 ssh2_pkt_send(ssh
, pktout
);
4103 del234(ssh
->rportfwds
, rpf
);
4105 } else if (epf
->local
) {
4106 pfd_terminate(epf
->local
);
4109 delpos234(ssh
->portfwds
, i
);
4111 i
--; /* so we don't skip one in the list */
4115 * And finally, set up any new port forwardings (status==CREATE).
4117 for (i
= 0; (epf
= index234(ssh
->portfwds
, i
)) != NULL
; i
++)
4118 if (epf
->status
== CREATE
) {
4119 char *sportdesc
, *dportdesc
;
4120 sportdesc
= dupprintf("%s%s%s%s%d%s",
4121 epf
->saddr ? epf
->saddr
: "",
4122 epf
->saddr ?
":" : "",
4123 epf
->sserv ? epf
->sserv
: "",
4124 epf
->sserv ?
"(" : "",
4126 epf
->sserv ?
")" : "");
4127 if (epf
->type
== 'D') {
4130 dportdesc
= dupprintf("%s:%s%s%d%s",
4132 epf
->dserv ? epf
->dserv
: "",
4133 epf
->dserv ?
"(" : "",
4135 epf
->dserv ?
")" : "");
4138 if (epf
->type
== 'L') {
4139 const char *err
= pfd_addforward(epf
->daddr
, epf
->dport
,
4140 epf
->saddr
, epf
->sport
,
4143 epf
->addressfamily
);
4145 logeventf(ssh
, "Local %sport %s forwarding to %s%s%s",
4146 epf
->addressfamily
== ADDRTYPE_IPV4 ?
"IPv4 " :
4147 epf
->addressfamily
== ADDRTYPE_IPV6 ?
"IPv6 " : "",
4148 sportdesc
, dportdesc
,
4149 err ?
" failed: " : "", err ? err
: "");
4150 } else if (epf
->type
== 'D') {
4151 const char *err
= pfd_addforward(NULL
, -1,
4152 epf
->saddr
, epf
->sport
,
4155 epf
->addressfamily
);
4157 logeventf(ssh
, "Local %sport %s SOCKS dynamic forwarding%s%s",
4158 epf
->addressfamily
== ADDRTYPE_IPV4 ?
"IPv4 " :
4159 epf
->addressfamily
== ADDRTYPE_IPV6 ?
"IPv6 " : "",
4161 err ?
" failed: " : "", err ? err
: "");
4163 struct ssh_rportfwd
*pf
;
4166 * Ensure the remote port forwardings tree exists.
4168 if (!ssh
->rportfwds
) {
4169 if (ssh
->version
== 1)
4170 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh1
);
4172 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh2
);
4175 pf
= snew(struct ssh_rportfwd
);
4176 strncpy(pf
->dhost
, epf
->daddr
, lenof(pf
->dhost
)-1);
4177 pf
->dhost
[lenof(pf
->dhost
)-1] = '\0';
4178 pf
->dport
= epf
->dport
;
4179 pf
->sport
= epf
->sport
;
4180 if (add234(ssh
->rportfwds
, pf
) != pf
) {
4181 logeventf(ssh
, "Duplicate remote port forwarding to %s:%d",
4182 epf
->daddr
, epf
->dport
);
4185 logeventf(ssh
, "Requesting remote port %s"
4186 " forward to %s", sportdesc
, dportdesc
);
4188 pf
->sportdesc
= sportdesc
;
4193 if (ssh
->version
== 1) {
4194 send_packet(ssh
, SSH1_CMSG_PORT_FORWARD_REQUEST
,
4195 PKT_INT
, epf
->sport
,
4196 PKT_STR
, epf
->daddr
,
4197 PKT_INT
, epf
->dport
,
4199 ssh_queue_handler(ssh
, SSH1_SMSG_SUCCESS
,
4201 ssh_rportfwd_succfail
, pf
);
4203 struct Packet
*pktout
;
4204 pktout
= ssh2_pkt_init(SSH2_MSG_GLOBAL_REQUEST
);
4205 ssh2_pkt_addstring(pktout
, "tcpip-forward");
4206 ssh2_pkt_addbool(pktout
, 1);/* want reply */
4208 ssh2_pkt_addstring(pktout
, epf
->saddr
);
4209 } else if (cfg
->rport_acceptall
) {
4210 ssh2_pkt_addstring(pktout
, "0.0.0.0");
4212 ssh2_pkt_addstring(pktout
, "127.0.0.1");
4214 ssh2_pkt_adduint32(pktout
, epf
->sport
);
4215 ssh2_pkt_send(ssh
, pktout
);
4217 ssh_queue_handler(ssh
, SSH2_MSG_REQUEST_SUCCESS
,
4218 SSH2_MSG_REQUEST_FAILURE
,
4219 ssh_rportfwd_succfail
, pf
);
4228 static void ssh1_smsg_stdout_stderr_data(Ssh ssh
, struct Packet
*pktin
)
4231 int stringlen
, bufsize
;
4233 ssh_pkt_getstring(pktin
, &string
, &stringlen
);
4234 if (string
== NULL
) {
4235 bombout(("Incoming terminal data packet was badly formed"));
4239 bufsize
= from_backend(ssh
->frontend
, pktin
->type
== SSH1_SMSG_STDERR_DATA
,
4241 if (!ssh
->v1_stdout_throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
4242 ssh
->v1_stdout_throttling
= 1;
4243 ssh1_throttle(ssh
, +1);
4247 static void ssh1_smsg_x11_open(Ssh ssh
, struct Packet
*pktin
)
4249 /* Remote side is trying to open a channel to talk to our
4250 * X-Server. Give them back a local channel number. */
4251 struct ssh_channel
*c
;
4252 int remoteid
= ssh_pkt_getuint32(pktin
);
4254 logevent("Received X11 connect request");
4255 /* Refuse if X11 forwarding is disabled. */
4256 if (!ssh
->X11_fwd_enabled
) {
4257 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4258 PKT_INT
, remoteid
, PKT_END
);
4259 logevent("Rejected X11 connect request");
4261 c
= snew(struct ssh_channel
);
4264 if (x11_init(&c
->u
.x11
.s
, ssh
->cfg
.x11_display
, c
,
4265 ssh
->x11auth
, NULL
, -1, &ssh
->cfg
) != NULL
) {
4266 logevent("Opening X11 forward connection failed");
4268 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4269 PKT_INT
, remoteid
, PKT_END
);
4272 ("Opening X11 forward connection succeeded");
4273 c
->remoteid
= remoteid
;
4274 c
->halfopen
= FALSE
;
4275 c
->localid
= alloc_channel_id(ssh
);
4277 c
->v
.v1
.throttling
= 0;
4278 c
->type
= CHAN_X11
; /* identify channel type */
4279 add234(ssh
->channels
, c
);
4280 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
4281 PKT_INT
, c
->remoteid
, PKT_INT
,
4282 c
->localid
, PKT_END
);
4283 logevent("Opened X11 forward channel");
4288 static void ssh1_smsg_agent_open(Ssh ssh
, struct Packet
*pktin
)
4290 /* Remote side is trying to open a channel to talk to our
4291 * agent. Give them back a local channel number. */
4292 struct ssh_channel
*c
;
4293 int remoteid
= ssh_pkt_getuint32(pktin
);
4295 /* Refuse if agent forwarding is disabled. */
4296 if (!ssh
->agentfwd_enabled
) {
4297 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4298 PKT_INT
, remoteid
, PKT_END
);
4300 c
= snew(struct ssh_channel
);
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_AGENT
; /* identify channel type */
4308 c
->u
.a
.lensofar
= 0;
4309 add234(ssh
->channels
, c
);
4310 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
4311 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
4316 static void ssh1_msg_port_open(Ssh ssh
, struct Packet
*pktin
)
4318 /* Remote side is trying to open a channel to talk to a
4319 * forwarded port. Give them back a local channel number. */
4320 struct ssh_channel
*c
;
4321 struct ssh_rportfwd pf
, *pfp
;
4326 c
= snew(struct ssh_channel
);
4329 remoteid
= ssh_pkt_getuint32(pktin
);
4330 ssh_pkt_getstring(pktin
, &host
, &hostsize
);
4331 port
= ssh_pkt_getuint32(pktin
);
4333 if (hostsize
>= lenof(pf
.dhost
))
4334 hostsize
= lenof(pf
.dhost
)-1;
4335 memcpy(pf
.dhost
, host
, hostsize
);
4336 pf
.dhost
[hostsize
] = '\0';
4338 pfp
= find234(ssh
->rportfwds
, &pf
, NULL
);
4341 logeventf(ssh
, "Rejected remote port open request for %s:%d",
4343 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4344 PKT_INT
, remoteid
, PKT_END
);
4346 logeventf(ssh
, "Received remote port open request for %s:%d",
4348 e
= pfd_newconnect(&c
->u
.pfd
.s
, pf
.dhost
, port
,
4349 c
, &ssh
->cfg
, pfp
->pfrec
->addressfamily
);
4351 logeventf(ssh
, "Port open failed: %s", e
);
4353 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4354 PKT_INT
, remoteid
, PKT_END
);
4356 c
->remoteid
= remoteid
;
4357 c
->halfopen
= FALSE
;
4358 c
->localid
= alloc_channel_id(ssh
);
4360 c
->v
.v1
.throttling
= 0;
4361 c
->type
= CHAN_SOCKDATA
; /* identify channel type */
4362 add234(ssh
->channels
, c
);
4363 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
4364 PKT_INT
, c
->remoteid
, PKT_INT
,
4365 c
->localid
, PKT_END
);
4366 logevent("Forwarded port opened successfully");
4371 static void ssh1_msg_channel_open_confirmation(Ssh ssh
, struct Packet
*pktin
)
4373 unsigned int remoteid
= ssh_pkt_getuint32(pktin
);
4374 unsigned int localid
= ssh_pkt_getuint32(pktin
);
4375 struct ssh_channel
*c
;
4377 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
4378 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
4379 c
->remoteid
= localid
;
4380 c
->halfopen
= FALSE
;
4381 c
->type
= CHAN_SOCKDATA
;
4382 c
->v
.v1
.throttling
= 0;
4383 pfd_confirm(c
->u
.pfd
.s
);
4386 if (c
&& c
->closes
) {
4388 * We have a pending close on this channel,
4389 * which we decided on before the server acked
4390 * the channel open. So now we know the
4391 * remoteid, we can close it again.
4393 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
,
4394 PKT_INT
, c
->remoteid
, PKT_END
);
4398 static void ssh1_msg_channel_open_failure(Ssh ssh
, struct Packet
*pktin
)
4400 unsigned int remoteid
= ssh_pkt_getuint32(pktin
);
4401 struct ssh_channel
*c
;
4403 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
4404 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
4405 logevent("Forwarded connection refused by server");
4406 pfd_close(c
->u
.pfd
.s
);
4407 del234(ssh
->channels
, c
);
4412 static void ssh1_msg_channel_close(Ssh ssh
, struct Packet
*pktin
)
4414 /* Remote side closes a channel. */
4415 unsigned i
= ssh_pkt_getuint32(pktin
);
4416 struct ssh_channel
*c
;
4417 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
4418 if (c
&& !c
->halfopen
) {
4421 (pktin
->type
== SSH1_MSG_CHANNEL_CLOSE ?
1 : 2);
4423 if ((c
->closes
== 0) && (c
->type
== CHAN_X11
)) {
4424 logevent("Forwarded X11 connection terminated");
4425 assert(c
->u
.x11
.s
!= NULL
);
4426 x11_close(c
->u
.x11
.s
);
4429 if ((c
->closes
== 0) && (c
->type
== CHAN_SOCKDATA
)) {
4430 logevent("Forwarded port closed");
4431 assert(c
->u
.pfd
.s
!= NULL
);
4432 pfd_close(c
->u
.pfd
.s
);
4436 c
->closes
|= (closetype
<< 2); /* seen this message */
4437 if (!(c
->closes
& closetype
)) {
4438 send_packet(ssh
, pktin
->type
, PKT_INT
, c
->remoteid
,
4440 c
->closes
|= closetype
; /* sent it too */
4443 if (c
->closes
== 15) {
4444 del234(ssh
->channels
, c
);
4448 bombout(("Received CHANNEL_CLOSE%s for %s channel %d\n",
4449 pktin
->type
== SSH1_MSG_CHANNEL_CLOSE ?
"" :
4450 "_CONFIRMATION", c ?
"half-open" : "nonexistent",
4455 static void ssh1_msg_channel_data(Ssh ssh
, struct Packet
*pktin
)
4457 /* Data sent down one of our channels. */
4458 int i
= ssh_pkt_getuint32(pktin
);
4461 struct ssh_channel
*c
;
4463 ssh_pkt_getstring(pktin
, &p
, &len
);
4465 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
4470 bufsize
= x11_send(c
->u
.x11
.s
, p
, len
);
4473 bufsize
= pfd_send(c
->u
.pfd
.s
, p
, len
);
4476 /* Data for an agent message. Buffer it. */
4478 if (c
->u
.a
.lensofar
< 4) {
4479 unsigned int l
= min(4 - c
->u
.a
.lensofar
, len
);
4480 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
, p
,
4484 c
->u
.a
.lensofar
+= l
;
4486 if (c
->u
.a
.lensofar
== 4) {
4488 4 + GET_32BIT(c
->u
.a
.msglen
);
4489 c
->u
.a
.message
= snewn(c
->u
.a
.totallen
,
4491 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
4493 if (c
->u
.a
.lensofar
>= 4 && len
> 0) {
4495 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
4497 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
, p
,
4501 c
->u
.a
.lensofar
+= l
;
4503 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
4506 if (agent_query(c
->u
.a
.message
,
4509 ssh_agentf_callback
, c
))
4510 ssh_agentf_callback(c
, reply
, replylen
);
4511 sfree(c
->u
.a
.message
);
4512 c
->u
.a
.lensofar
= 0;
4515 bufsize
= 0; /* agent channels never back up */
4518 if (!c
->v
.v1
.throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
4519 c
->v
.v1
.throttling
= 1;
4520 ssh1_throttle(ssh
, +1);
4525 static void ssh1_smsg_exit_status(Ssh ssh
, struct Packet
*pktin
)
4527 ssh
->exitcode
= ssh_pkt_getuint32(pktin
);
4528 logeventf(ssh
, "Server sent command exit status %d", ssh
->exitcode
);
4529 send_packet(ssh
, SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
4531 * In case `helpful' firewalls or proxies tack
4532 * extra human-readable text on the end of the
4533 * session which we might mistake for another
4534 * encrypted packet, we close the session once
4535 * we've sent EXIT_CONFIRMATION.
4537 ssh
->close_expected
= TRUE
;
4538 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
4541 /* Helper function to deal with sending tty modes for REQUEST_PTY */
4542 static void ssh1_send_ttymode(void *data
, char *mode
, char *val
)
4544 struct Packet
*pktout
= (struct Packet
*)data
;
4546 unsigned int arg
= 0;
4547 while (strcmp(mode
, ssh_ttymodes
[i
].mode
) != 0) i
++;
4548 if (i
== lenof(ssh_ttymodes
)) return;
4549 switch (ssh_ttymodes
[i
].type
) {
4551 arg
= ssh_tty_parse_specchar(val
);
4554 arg
= ssh_tty_parse_boolean(val
);
4557 ssh2_pkt_addbyte(pktout
, ssh_ttymodes
[i
].opcode
);
4558 ssh2_pkt_addbyte(pktout
, arg
);
4562 static void do_ssh1_connection(Ssh ssh
, unsigned char *in
, int inlen
,
4563 struct Packet
*pktin
)
4565 crBegin(ssh
->do_ssh1_connection_crstate
);
4567 ssh
->packet_dispatch
[SSH1_SMSG_STDOUT_DATA
] =
4568 ssh
->packet_dispatch
[SSH1_SMSG_STDERR_DATA
] =
4569 ssh1_smsg_stdout_stderr_data
;
4571 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
] =
4572 ssh1_msg_channel_open_confirmation
;
4573 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_OPEN_FAILURE
] =
4574 ssh1_msg_channel_open_failure
;
4575 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_CLOSE
] =
4576 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
] =
4577 ssh1_msg_channel_close
;
4578 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_DATA
] = ssh1_msg_channel_data
;
4579 ssh
->packet_dispatch
[SSH1_SMSG_EXIT_STATUS
] = ssh1_smsg_exit_status
;
4581 if (ssh
->cfg
.agentfwd
&& agent_exists()) {
4582 logevent("Requesting agent forwarding");
4583 send_packet(ssh
, SSH1_CMSG_AGENT_REQUEST_FORWARDING
, PKT_END
);
4587 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4588 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4589 bombout(("Protocol confusion"));
4591 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4592 logevent("Agent forwarding refused");
4594 logevent("Agent forwarding enabled");
4595 ssh
->agentfwd_enabled
= TRUE
;
4596 ssh
->packet_dispatch
[SSH1_SMSG_AGENT_OPEN
] = ssh1_smsg_agent_open
;
4600 if (ssh
->cfg
.x11_forward
) {
4601 char proto
[20], data
[64];
4602 logevent("Requesting X11 forwarding");
4603 ssh
->x11auth
= x11_invent_auth(proto
, sizeof(proto
),
4604 data
, sizeof(data
), ssh
->cfg
.x11_auth
);
4605 x11_get_real_auth(ssh
->x11auth
, ssh
->cfg
.x11_display
);
4606 if (ssh
->v1_local_protoflags
& SSH1_PROTOFLAG_SCREEN_NUMBER
) {
4607 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
4608 PKT_STR
, proto
, PKT_STR
, data
,
4609 PKT_INT
, x11_get_screen_number(ssh
->cfg
.x11_display
),
4612 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
4613 PKT_STR
, proto
, PKT_STR
, data
, PKT_END
);
4618 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4619 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4620 bombout(("Protocol confusion"));
4622 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4623 logevent("X11 forwarding refused");
4625 logevent("X11 forwarding enabled");
4626 ssh
->X11_fwd_enabled
= TRUE
;
4627 ssh
->packet_dispatch
[SSH1_SMSG_X11_OPEN
] = ssh1_smsg_x11_open
;
4631 ssh_setup_portfwd(ssh
, &ssh
->cfg
);
4632 ssh
->packet_dispatch
[SSH1_MSG_PORT_OPEN
] = ssh1_msg_port_open
;
4634 if (!ssh
->cfg
.nopty
) {
4636 /* Unpick the terminal-speed string. */
4637 /* XXX perhaps we should allow no speeds to be sent. */
4638 ssh
->ospeed
= 38400; ssh
->ispeed
= 38400; /* last-resort defaults */
4639 sscanf(ssh
->cfg
.termspeed
, "%d,%d", &ssh
->ospeed
, &ssh
->ispeed
);
4640 /* Send the pty request. */
4641 pkt
= ssh1_pkt_init(SSH1_CMSG_REQUEST_PTY
);
4642 ssh_pkt_addstring(pkt
, ssh
->cfg
.termtype
);
4643 ssh_pkt_adduint32(pkt
, ssh
->term_height
);
4644 ssh_pkt_adduint32(pkt
, ssh
->term_width
);
4645 ssh_pkt_adduint32(pkt
, 0); /* width in pixels */
4646 ssh_pkt_adduint32(pkt
, 0); /* height in pixels */
4647 parse_ttymodes(ssh
, ssh
->cfg
.ttymodes
,
4648 ssh1_send_ttymode
, (void *)pkt
);
4649 ssh_pkt_addbyte(pkt
, SSH1_TTY_OP_ISPEED
);
4650 ssh_pkt_adduint32(pkt
, ssh
->ispeed
);
4651 ssh_pkt_addbyte(pkt
, SSH1_TTY_OP_OSPEED
);
4652 ssh_pkt_adduint32(pkt
, ssh
->ospeed
);
4653 ssh_pkt_addbyte(pkt
, SSH_TTY_OP_END
);
4655 ssh
->state
= SSH_STATE_INTERMED
;
4659 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4660 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4661 bombout(("Protocol confusion"));
4663 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4664 c_write_str(ssh
, "Server refused to allocate pty\r\n");
4665 ssh
->editing
= ssh
->echoing
= 1;
4667 logeventf(ssh
, "Allocated pty (ospeed %dbps, ispeed %dbps)",
4668 ssh
->ospeed
, ssh
->ispeed
);
4670 ssh
->editing
= ssh
->echoing
= 1;
4673 if (ssh
->cfg
.compression
) {
4674 send_packet(ssh
, SSH1_CMSG_REQUEST_COMPRESSION
, PKT_INT
, 6, PKT_END
);
4678 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4679 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4680 bombout(("Protocol confusion"));
4682 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4683 c_write_str(ssh
, "Server refused to compress\r\n");
4685 logevent("Started compression");
4686 ssh
->v1_compressing
= TRUE
;
4687 ssh
->cs_comp_ctx
= zlib_compress_init();
4688 logevent("Initialised zlib (RFC1950) compression");
4689 ssh
->sc_comp_ctx
= zlib_decompress_init();
4690 logevent("Initialised zlib (RFC1950) decompression");
4694 * Start the shell or command.
4696 * Special case: if the first-choice command is an SSH-2
4697 * subsystem (hence not usable here) and the second choice
4698 * exists, we fall straight back to that.
4701 char *cmd
= ssh
->cfg
.remote_cmd_ptr
;
4703 if (!cmd
) cmd
= ssh
->cfg
.remote_cmd
;
4705 if (ssh
->cfg
.ssh_subsys
&& ssh
->cfg
.remote_cmd_ptr2
) {
4706 cmd
= ssh
->cfg
.remote_cmd_ptr2
;
4707 ssh
->fallback_cmd
= TRUE
;
4710 send_packet(ssh
, SSH1_CMSG_EXEC_CMD
, PKT_STR
, cmd
, PKT_END
);
4712 send_packet(ssh
, SSH1_CMSG_EXEC_SHELL
, PKT_END
);
4713 logevent("Started session");
4716 ssh
->state
= SSH_STATE_SESSION
;
4717 if (ssh
->size_needed
)
4718 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
4719 if (ssh
->eof_needed
)
4720 ssh_special(ssh
, TS_EOF
);
4723 ldisc_send(ssh
->ldisc
, NULL
, 0, 0);/* cause ldisc to notice changes */
4725 ssh
->channels
= newtree234(ssh_channelcmp
);
4729 * By this point, most incoming packets are already being
4730 * handled by the dispatch table, and we need only pay
4731 * attention to the unusual ones.
4736 if (pktin
->type
== SSH1_SMSG_SUCCESS
) {
4737 /* may be from EXEC_SHELL on some servers */
4738 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4739 /* may be from EXEC_SHELL on some servers
4740 * if no pty is available or in other odd cases. Ignore */
4742 bombout(("Strange packet received: type %d", pktin
->type
));
4747 int len
= min(inlen
, 512);
4748 send_packet(ssh
, SSH1_CMSG_STDIN_DATA
, PKTT_DATA
,
4749 PKT_INT
, len
, PKT_DATA
, in
, len
,
4750 PKTT_OTHER
, PKT_END
);
4761 * Handle the top-level SSH-2 protocol.
4763 static void ssh1_msg_debug(Ssh ssh
, struct Packet
*pktin
)
4768 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
4769 logeventf(ssh
, "Remote debug message: %.*s", msglen
, msg
);
4772 static void ssh1_msg_disconnect(Ssh ssh
, struct Packet
*pktin
)
4774 /* log reason code in disconnect message */
4778 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
4779 bombout(("Server sent disconnect message:\n\"%.*s\"", msglen
, msg
));
4782 static void ssh_msg_ignore(Ssh ssh
, struct Packet
*pktin
)
4784 /* Do nothing, because we're ignoring it! Duhh. */
4787 static void ssh1_protocol_setup(Ssh ssh
)
4792 * Most messages are handled by the coroutines.
4794 for (i
= 0; i
< 256; i
++)
4795 ssh
->packet_dispatch
[i
] = NULL
;
4798 * These special message types we install handlers for.
4800 ssh
->packet_dispatch
[SSH1_MSG_DISCONNECT
] = ssh1_msg_disconnect
;
4801 ssh
->packet_dispatch
[SSH1_MSG_IGNORE
] = ssh_msg_ignore
;
4802 ssh
->packet_dispatch
[SSH1_MSG_DEBUG
] = ssh1_msg_debug
;
4805 static void ssh1_protocol(Ssh ssh
, void *vin
, int inlen
,
4806 struct Packet
*pktin
)
4808 unsigned char *in
=(unsigned char*)vin
;
4809 if (ssh
->state
== SSH_STATE_CLOSED
)
4812 if (pktin
&& ssh
->packet_dispatch
[pktin
->type
]) {
4813 ssh
->packet_dispatch
[pktin
->type
](ssh
, pktin
);
4817 if (!ssh
->protocol_initial_phase_done
) {
4818 if (do_ssh1_login(ssh
, in
, inlen
, pktin
))
4819 ssh
->protocol_initial_phase_done
= TRUE
;
4824 do_ssh1_connection(ssh
, in
, inlen
, pktin
);
4828 * Utility routine for decoding comma-separated strings in KEXINIT.
4830 static int in_commasep_string(char *needle
, char *haystack
, int haylen
)
4833 if (!needle
|| !haystack
) /* protect against null pointers */
4835 needlen
= strlen(needle
);
4838 * Is it at the start of the string?
4840 if (haylen
>= needlen
&& /* haystack is long enough */
4841 !memcmp(needle
, haystack
, needlen
) && /* initial match */
4842 (haylen
== needlen
|| haystack
[needlen
] == ',')
4843 /* either , or EOS follows */
4847 * If not, search for the next comma and resume after that.
4848 * If no comma found, terminate.
4850 while (haylen
> 0 && *haystack
!= ',')
4851 haylen
--, haystack
++;
4854 haylen
--, haystack
++; /* skip over comma itself */
4859 * Similar routine for checking whether we have the first string in a list.
4861 static int first_in_commasep_string(char *needle
, char *haystack
, int haylen
)
4864 if (!needle
|| !haystack
) /* protect against null pointers */
4866 needlen
= strlen(needle
);
4868 * Is it at the start of the string?
4870 if (haylen
>= needlen
&& /* haystack is long enough */
4871 !memcmp(needle
, haystack
, needlen
) && /* initial match */
4872 (haylen
== needlen
|| haystack
[needlen
] == ',')
4873 /* either , or EOS follows */
4881 * SSH-2 key creation method.
4883 static void ssh2_mkkey(Ssh ssh
, Bignum K
, unsigned char *H
,
4884 unsigned char *sessid
, char chr
,
4885 unsigned char *keyspace
)
4888 /* First 20 bytes. */
4890 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
4892 SHA_Bytes(&s
, H
, 20);
4893 SHA_Bytes(&s
, &chr
, 1);
4894 SHA_Bytes(&s
, sessid
, 20);
4895 SHA_Final(&s
, keyspace
);
4896 /* Next 20 bytes. */
4898 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
4900 SHA_Bytes(&s
, H
, 20);
4901 SHA_Bytes(&s
, keyspace
, 20);
4902 SHA_Final(&s
, keyspace
+ 20);
4906 * Handle the SSH-2 transport layer.
4908 static int do_ssh2_transport(Ssh ssh
, void *vin
, int inlen
,
4909 struct Packet
*pktin
)
4911 unsigned char *in
= (unsigned char *)vin
;
4912 struct do_ssh2_transport_state
{
4913 int nbits
, pbits
, warn_kex
, warn_cscipher
, warn_sccipher
;
4914 Bignum p
, g
, e
, f
, K
;
4915 int kex_init_value
, kex_reply_value
;
4916 const struct ssh_mac
**maclist
;
4918 const struct ssh2_cipher
*cscipher_tobe
;
4919 const struct ssh2_cipher
*sccipher_tobe
;
4920 const struct ssh_mac
*csmac_tobe
;
4921 const struct ssh_mac
*scmac_tobe
;
4922 const struct ssh_compress
*cscomp_tobe
;
4923 const struct ssh_compress
*sccomp_tobe
;
4924 char *hostkeydata
, *sigdata
, *keystr
, *fingerprint
;
4925 int hostkeylen
, siglen
;
4926 void *hkey
; /* actual host key */
4927 unsigned char exchange_hash
[20];
4928 int n_preferred_kex
;
4929 const struct ssh_kex
*preferred_kex
[KEX_MAX
];
4930 int n_preferred_ciphers
;
4931 const struct ssh2_ciphers
*preferred_ciphers
[CIPHER_MAX
];
4932 const struct ssh_compress
*preferred_comp
;
4933 int got_session_id
, activated_authconn
;
4934 struct Packet
*pktout
;
4939 crState(do_ssh2_transport_state
);
4941 crBegin(ssh
->do_ssh2_transport_crstate
);
4943 s
->cscipher_tobe
= s
->sccipher_tobe
= NULL
;
4944 s
->csmac_tobe
= s
->scmac_tobe
= NULL
;
4945 s
->cscomp_tobe
= s
->sccomp_tobe
= NULL
;
4947 s
->got_session_id
= s
->activated_authconn
= FALSE
;
4950 * Be prepared to work around the buggy MAC problem.
4952 if (ssh
->remote_bugs
& BUG_SSH2_HMAC
)
4953 s
->maclist
= buggymacs
, s
->nmacs
= lenof(buggymacs
);
4955 s
->maclist
= macs
, s
->nmacs
= lenof(macs
);
4958 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_KEX_MASK
;
4960 int i
, j
, commalist_started
;
4963 * Set up the preferred key exchange. (NULL => warn below here)
4965 s
->n_preferred_kex
= 0;
4966 for (i
= 0; i
< KEX_MAX
; i
++) {
4967 switch (ssh
->cfg
.ssh_kexlist
[i
]) {
4969 s
->preferred_kex
[s
->n_preferred_kex
++] =
4970 &ssh_diffiehellman_gex
;
4973 s
->preferred_kex
[s
->n_preferred_kex
++] =
4974 &ssh_diffiehellman_group14
;
4977 s
->preferred_kex
[s
->n_preferred_kex
++] =
4978 &ssh_diffiehellman_group1
;
4981 /* Flag for later. Don't bother if it's the last in
4983 if (i
< KEX_MAX
- 1) {
4984 s
->preferred_kex
[s
->n_preferred_kex
++] = NULL
;
4991 * Set up the preferred ciphers. (NULL => warn below here)
4993 s
->n_preferred_ciphers
= 0;
4994 for (i
= 0; i
< CIPHER_MAX
; i
++) {
4995 switch (ssh
->cfg
.ssh_cipherlist
[i
]) {
4996 case CIPHER_BLOWFISH
:
4997 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_blowfish
;
5000 if (ssh
->cfg
.ssh2_des_cbc
) {
5001 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_des
;
5005 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_3des
;
5008 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_aes
;
5010 case CIPHER_ARCFOUR
:
5011 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_arcfour
;
5014 /* Flag for later. Don't bother if it's the last in
5016 if (i
< CIPHER_MAX
- 1) {
5017 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = NULL
;
5024 * Set up preferred compression.
5026 if (ssh
->cfg
.compression
)
5027 s
->preferred_comp
= &ssh_zlib
;
5029 s
->preferred_comp
= &ssh_comp_none
;
5032 * Enable queueing of outgoing auth- or connection-layer
5033 * packets while we are in the middle of a key exchange.
5035 ssh
->queueing
= TRUE
;
5038 * Flag that KEX is in progress.
5040 ssh
->kex_in_progress
= TRUE
;
5043 * Construct and send our key exchange packet.
5045 s
->pktout
= ssh2_pkt_init(SSH2_MSG_KEXINIT
);
5046 for (i
= 0; i
< 16; i
++)
5047 ssh2_pkt_addbyte(s
->pktout
, (unsigned char) random_byte());
5048 /* List key exchange algorithms. */
5049 ssh2_pkt_addstring_start(s
->pktout
);
5050 commalist_started
= 0;
5051 for (i
= 0; i
< s
->n_preferred_kex
; i
++) {
5052 const struct ssh_kex
*k
= s
->preferred_kex
[i
];
5053 if (!k
) continue; /* warning flag */
5054 if (commalist_started
)
5055 ssh2_pkt_addstring_str(s
->pktout
, ",");
5056 ssh2_pkt_addstring_str(s
->pktout
, s
->preferred_kex
[i
]->name
);
5057 commalist_started
= 1;
5059 /* List server host key algorithms. */
5060 ssh2_pkt_addstring_start(s
->pktout
);
5061 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
5062 ssh2_pkt_addstring_str(s
->pktout
, hostkey_algs
[i
]->name
);
5063 if (i
< lenof(hostkey_algs
) - 1)
5064 ssh2_pkt_addstring_str(s
->pktout
, ",");
5066 /* List client->server encryption algorithms. */
5067 ssh2_pkt_addstring_start(s
->pktout
);
5068 commalist_started
= 0;
5069 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
5070 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
5071 if (!c
) continue; /* warning flag */
5072 for (j
= 0; j
< c
->nciphers
; j
++) {
5073 if (commalist_started
)
5074 ssh2_pkt_addstring_str(s
->pktout
, ",");
5075 ssh2_pkt_addstring_str(s
->pktout
, c
->list
[j
]->name
);
5076 commalist_started
= 1;
5079 /* List server->client encryption algorithms. */
5080 ssh2_pkt_addstring_start(s
->pktout
);
5081 commalist_started
= 0;
5082 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
5083 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
5084 if (!c
) continue; /* warning flag */
5085 for (j
= 0; j
< c
->nciphers
; j
++) {
5086 if (commalist_started
)
5087 ssh2_pkt_addstring_str(s
->pktout
, ",");
5088 ssh2_pkt_addstring_str(s
->pktout
, c
->list
[j
]->name
);
5089 commalist_started
= 1;
5092 /* List client->server MAC algorithms. */
5093 ssh2_pkt_addstring_start(s
->pktout
);
5094 for (i
= 0; i
< s
->nmacs
; i
++) {
5095 ssh2_pkt_addstring_str(s
->pktout
, s
->maclist
[i
]->name
);
5096 if (i
< s
->nmacs
- 1)
5097 ssh2_pkt_addstring_str(s
->pktout
, ",");
5099 /* List server->client MAC algorithms. */
5100 ssh2_pkt_addstring_start(s
->pktout
);
5101 for (i
= 0; i
< s
->nmacs
; i
++) {
5102 ssh2_pkt_addstring_str(s
->pktout
, s
->maclist
[i
]->name
);
5103 if (i
< s
->nmacs
- 1)
5104 ssh2_pkt_addstring_str(s
->pktout
, ",");
5106 /* List client->server compression algorithms. */
5107 ssh2_pkt_addstring_start(s
->pktout
);
5108 assert(lenof(compressions
) > 1);
5109 ssh2_pkt_addstring_str(s
->pktout
, s
->preferred_comp
->name
);
5110 for (i
= 0; i
< lenof(compressions
); i
++) {
5111 const struct ssh_compress
*c
= compressions
[i
];
5112 if (c
!= s
->preferred_comp
) {
5113 ssh2_pkt_addstring_str(s
->pktout
, ",");
5114 ssh2_pkt_addstring_str(s
->pktout
, c
->name
);
5117 /* List server->client compression algorithms. */
5118 ssh2_pkt_addstring_start(s
->pktout
);
5119 assert(lenof(compressions
) > 1);
5120 ssh2_pkt_addstring_str(s
->pktout
, s
->preferred_comp
->name
);
5121 for (i
= 0; i
< lenof(compressions
); i
++) {
5122 const struct ssh_compress
*c
= compressions
[i
];
5123 if (c
!= s
->preferred_comp
) {
5124 ssh2_pkt_addstring_str(s
->pktout
, ",");
5125 ssh2_pkt_addstring_str(s
->pktout
, c
->name
);
5128 /* List client->server languages. Empty list. */
5129 ssh2_pkt_addstring_start(s
->pktout
);
5130 /* List server->client languages. Empty list. */
5131 ssh2_pkt_addstring_start(s
->pktout
);
5132 /* First KEX packet does _not_ follow, because we're not that brave. */
5133 ssh2_pkt_addbool(s
->pktout
, FALSE
);
5135 ssh2_pkt_adduint32(s
->pktout
, 0);
5138 ssh
->exhash
= ssh
->exhashbase
;
5139 sha_string(&ssh
->exhash
, s
->pktout
->data
+ 5, s
->pktout
->length
- 5);
5141 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5145 if (pktin
->length
> 5)
5146 sha_string(&ssh
->exhash
, pktin
->data
+ 5, pktin
->length
- 5);
5149 * Now examine the other side's KEXINIT to see what we're up
5153 char *str
, *preferred
;
5156 if (pktin
->type
!= SSH2_MSG_KEXINIT
) {
5157 bombout(("expected key exchange packet from server"));
5161 ssh
->hostkey
= NULL
;
5162 s
->cscipher_tobe
= NULL
;
5163 s
->sccipher_tobe
= NULL
;
5164 s
->csmac_tobe
= NULL
;
5165 s
->scmac_tobe
= NULL
;
5166 s
->cscomp_tobe
= NULL
;
5167 s
->sccomp_tobe
= NULL
;
5168 s
->warn_kex
= s
->warn_cscipher
= s
->warn_sccipher
= FALSE
;
5170 pktin
->savedpos
+= 16; /* skip garbage cookie */
5171 ssh_pkt_getstring(pktin
, &str
, &len
); /* key exchange algorithms */
5174 for (i
= 0; i
< s
->n_preferred_kex
; i
++) {
5175 const struct ssh_kex
*k
= s
->preferred_kex
[i
];
5179 if (!preferred
) preferred
= k
->name
;
5180 if (in_commasep_string(k
->name
, str
, len
))
5187 bombout(("Couldn't agree a key exchange algorithm (available: %s)",
5188 str ? str
: "(null)"));
5192 * Note that the server's guess is considered wrong if it doesn't match
5193 * the first algorithm in our list, even if it's still the algorithm
5196 s
->guessok
= first_in_commasep_string(preferred
, str
, len
);
5197 ssh_pkt_getstring(pktin
, &str
, &len
); /* host key algorithms */
5198 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
5199 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
5200 ssh
->hostkey
= hostkey_algs
[i
];
5204 s
->guessok
= s
->guessok
&&
5205 first_in_commasep_string(hostkey_algs
[0]->name
, str
, len
);
5206 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server cipher */
5207 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
5208 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
5210 s
->warn_cscipher
= TRUE
;
5212 for (j
= 0; j
< c
->nciphers
; j
++) {
5213 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
5214 s
->cscipher_tobe
= c
->list
[j
];
5219 if (s
->cscipher_tobe
)
5222 if (!s
->cscipher_tobe
) {
5223 bombout(("Couldn't agree a client-to-server cipher (available: %s)",
5224 str ? str
: "(null)"));
5228 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client cipher */
5229 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
5230 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
5232 s
->warn_sccipher
= TRUE
;
5234 for (j
= 0; j
< c
->nciphers
; j
++) {
5235 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
5236 s
->sccipher_tobe
= c
->list
[j
];
5241 if (s
->sccipher_tobe
)
5244 if (!s
->sccipher_tobe
) {
5245 bombout(("Couldn't agree a server-to-client cipher (available: %s)",
5246 str ? str
: "(null)"));
5250 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server mac */
5251 for (i
= 0; i
< s
->nmacs
; i
++) {
5252 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
5253 s
->csmac_tobe
= s
->maclist
[i
];
5257 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client mac */
5258 for (i
= 0; i
< s
->nmacs
; i
++) {
5259 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
5260 s
->scmac_tobe
= s
->maclist
[i
];
5264 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server compression */
5265 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
5266 const struct ssh_compress
*c
=
5267 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
5268 if (in_commasep_string(c
->name
, str
, len
)) {
5273 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client compression */
5274 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
5275 const struct ssh_compress
*c
=
5276 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
5277 if (in_commasep_string(c
->name
, str
, len
)) {
5282 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server language */
5283 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client language */
5284 s
->ignorepkt
= ssh2_pkt_getbool(pktin
) && !s
->guessok
;
5287 ssh_set_frozen(ssh
, 1);
5288 s
->dlgret
= askalg(ssh
->frontend
, "key-exchange algorithm",
5290 ssh_dialog_callback
, ssh
);
5291 if (s
->dlgret
< 0) {
5295 bombout(("Unexpected data from server while"
5296 " waiting for user response"));
5299 } while (pktin
|| inlen
> 0);
5300 s
->dlgret
= ssh
->user_response
;
5302 ssh_set_frozen(ssh
, 0);
5303 if (s
->dlgret
== 0) {
5304 ssh
->close_expected
= TRUE
;
5305 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5310 if (s
->warn_cscipher
) {
5311 ssh_set_frozen(ssh
, 1);
5312 s
->dlgret
= askalg(ssh
->frontend
,
5313 "client-to-server cipher",
5314 s
->cscipher_tobe
->name
,
5315 ssh_dialog_callback
, ssh
);
5316 if (s
->dlgret
< 0) {
5320 bombout(("Unexpected data from server while"
5321 " waiting for user response"));
5324 } while (pktin
|| inlen
> 0);
5325 s
->dlgret
= ssh
->user_response
;
5327 ssh_set_frozen(ssh
, 0);
5328 if (s
->dlgret
== 0) {
5329 ssh
->close_expected
= TRUE
;
5330 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5335 if (s
->warn_sccipher
) {
5336 ssh_set_frozen(ssh
, 1);
5337 s
->dlgret
= askalg(ssh
->frontend
,
5338 "server-to-client cipher",
5339 s
->sccipher_tobe
->name
,
5340 ssh_dialog_callback
, ssh
);
5341 if (s
->dlgret
< 0) {
5345 bombout(("Unexpected data from server while"
5346 " waiting for user response"));
5349 } while (pktin
|| inlen
> 0);
5350 s
->dlgret
= ssh
->user_response
;
5352 ssh_set_frozen(ssh
, 0);
5353 if (s
->dlgret
== 0) {
5354 ssh
->close_expected
= TRUE
;
5355 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5360 if (s
->ignorepkt
) /* first_kex_packet_follows */
5361 crWaitUntil(pktin
); /* Ignore packet */
5365 * Work out the number of bits of key we will need from the key
5366 * exchange. We start with the maximum key length of either
5372 csbits
= s
->cscipher_tobe
->keylen
;
5373 scbits
= s
->sccipher_tobe
->keylen
;
5374 s
->nbits
= (csbits
> scbits ? csbits
: scbits
);
5376 /* The keys only have 160-bit entropy, since they're based on
5377 * a SHA-1 hash. So cap the key size at 160 bits. */
5382 * If we're doing Diffie-Hellman group exchange, start by
5383 * requesting a group.
5385 if (!ssh
->kex
->pdata
) {
5386 logevent("Doing Diffie-Hellman group exchange");
5387 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGEX
;
5389 * Work out how big a DH group we will need to allow that
5392 s
->pbits
= 512 << ((s
->nbits
- 1) / 64);
5393 s
->pktout
= ssh2_pkt_init(SSH2_MSG_KEX_DH_GEX_REQUEST
);
5394 ssh2_pkt_adduint32(s
->pktout
, s
->pbits
);
5395 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5398 if (pktin
->type
!= SSH2_MSG_KEX_DH_GEX_GROUP
) {
5399 bombout(("expected key exchange group packet from server"));
5402 s
->p
= ssh2_pkt_getmp(pktin
);
5403 s
->g
= ssh2_pkt_getmp(pktin
);
5404 if (!s
->p
|| !s
->g
) {
5405 bombout(("unable to read mp-ints from incoming group packet"));
5408 ssh
->kex_ctx
= dh_setup_gex(s
->p
, s
->g
);
5409 s
->kex_init_value
= SSH2_MSG_KEX_DH_GEX_INIT
;
5410 s
->kex_reply_value
= SSH2_MSG_KEX_DH_GEX_REPLY
;
5412 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGROUP
;
5413 ssh
->kex_ctx
= dh_setup_group(ssh
->kex
);
5414 s
->kex_init_value
= SSH2_MSG_KEXDH_INIT
;
5415 s
->kex_reply_value
= SSH2_MSG_KEXDH_REPLY
;
5416 logeventf(ssh
, "Using Diffie-Hellman with standard group \"%s\"",
5417 ssh
->kex
->groupname
);
5420 logevent("Doing Diffie-Hellman key exchange");
5422 * Now generate and send e for Diffie-Hellman.
5424 set_busy_status(ssh
->frontend
, BUSY_CPU
); /* this can take a while */
5425 s
->e
= dh_create_e(ssh
->kex_ctx
, s
->nbits
* 2);
5426 s
->pktout
= ssh2_pkt_init(s
->kex_init_value
);
5427 ssh2_pkt_addmp(s
->pktout
, s
->e
);
5428 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5430 set_busy_status(ssh
->frontend
, BUSY_WAITING
); /* wait for server */
5432 if (pktin
->type
!= s
->kex_reply_value
) {
5433 bombout(("expected key exchange reply packet from server"));
5436 set_busy_status(ssh
->frontend
, BUSY_CPU
); /* cogitate */
5437 ssh_pkt_getstring(pktin
, &s
->hostkeydata
, &s
->hostkeylen
);
5438 s
->f
= ssh2_pkt_getmp(pktin
);
5440 bombout(("unable to parse key exchange reply packet"));
5443 ssh_pkt_getstring(pktin
, &s
->sigdata
, &s
->siglen
);
5445 s
->K
= dh_find_K(ssh
->kex_ctx
, s
->f
);
5447 /* We assume everything from now on will be quick, and it might
5448 * involve user interaction. */
5449 set_busy_status(ssh
->frontend
, BUSY_NOT
);
5451 sha_string(&ssh
->exhash
, s
->hostkeydata
, s
->hostkeylen
);
5452 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
5453 sha_uint32(&ssh
->exhash
, s
->pbits
);
5454 sha_mpint(&ssh
->exhash
, s
->p
);
5455 sha_mpint(&ssh
->exhash
, s
->g
);
5457 sha_mpint(&ssh
->exhash
, s
->e
);
5458 sha_mpint(&ssh
->exhash
, s
->f
);
5459 sha_mpint(&ssh
->exhash
, s
->K
);
5460 SHA_Final(&ssh
->exhash
, s
->exchange_hash
);
5462 dh_cleanup(ssh
->kex_ctx
);
5463 ssh
->kex_ctx
= NULL
;
5466 debug(("Exchange hash is:\n"));
5467 dmemdump(s
->exchange_hash
, 20);
5470 s
->hkey
= ssh
->hostkey
->newkey(s
->hostkeydata
, s
->hostkeylen
);
5472 !ssh
->hostkey
->verifysig(s
->hkey
, s
->sigdata
, s
->siglen
,
5473 (char *)s
->exchange_hash
, 20)) {
5474 bombout(("Server's host key did not match the signature supplied"));
5479 * Authenticate remote host: verify host key. (We've already
5480 * checked the signature of the exchange hash.)
5482 s
->keystr
= ssh
->hostkey
->fmtkey(s
->hkey
);
5483 s
->fingerprint
= ssh
->hostkey
->fingerprint(s
->hkey
);
5484 ssh_set_frozen(ssh
, 1);
5485 s
->dlgret
= verify_ssh_host_key(ssh
->frontend
,
5486 ssh
->savedhost
, ssh
->savedport
,
5487 ssh
->hostkey
->keytype
, s
->keystr
,
5489 ssh_dialog_callback
, ssh
);
5490 if (s
->dlgret
< 0) {
5494 bombout(("Unexpected data from server while waiting"
5495 " for user host key response"));
5498 } while (pktin
|| inlen
> 0);
5499 s
->dlgret
= ssh
->user_response
;
5501 ssh_set_frozen(ssh
, 0);
5502 if (s
->dlgret
== 0) {
5503 ssh
->close_expected
= TRUE
;
5504 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5507 if (!s
->got_session_id
) { /* don't bother logging this in rekeys */
5508 logevent("Host key fingerprint is:");
5509 logevent(s
->fingerprint
);
5511 sfree(s
->fingerprint
);
5513 ssh
->hostkey
->freekey(s
->hkey
);
5516 * The exchange hash from the very first key exchange is also
5517 * the session id, used in session key construction and
5520 if (!s
->got_session_id
) {
5521 memcpy(ssh
->v2_session_id
, s
->exchange_hash
,
5522 sizeof(s
->exchange_hash
));
5523 s
->got_session_id
= TRUE
;
5527 * Send SSH2_MSG_NEWKEYS.
5529 s
->pktout
= ssh2_pkt_init(SSH2_MSG_NEWKEYS
);
5530 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5531 ssh
->outgoing_data_size
= 0; /* start counting from here */
5534 * We've sent client NEWKEYS, so create and initialise
5535 * client-to-server session keys.
5537 if (ssh
->cs_cipher_ctx
)
5538 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
5539 ssh
->cscipher
= s
->cscipher_tobe
;
5540 ssh
->cs_cipher_ctx
= ssh
->cscipher
->make_context();
5542 if (ssh
->cs_mac_ctx
)
5543 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
5544 ssh
->csmac
= s
->csmac_tobe
;
5545 ssh
->cs_mac_ctx
= ssh
->csmac
->make_context();
5547 if (ssh
->cs_comp_ctx
)
5548 ssh
->cscomp
->compress_cleanup(ssh
->cs_comp_ctx
);
5549 ssh
->cscomp
= s
->cscomp_tobe
;
5550 ssh
->cs_comp_ctx
= ssh
->cscomp
->compress_init();
5553 * Set IVs on client-to-server keys. Here we use the exchange
5554 * hash from the _first_ key exchange.
5557 unsigned char keyspace
[40];
5558 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'C',keyspace
);
5559 ssh
->cscipher
->setkey(ssh
->cs_cipher_ctx
, keyspace
);
5560 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'A',keyspace
);
5561 ssh
->cscipher
->setiv(ssh
->cs_cipher_ctx
, keyspace
);
5562 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'E',keyspace
);
5563 ssh
->csmac
->setkey(ssh
->cs_mac_ctx
, keyspace
);
5566 logeventf(ssh
, "Initialised %.200s client->server encryption",
5567 ssh
->cscipher
->text_name
);
5568 logeventf(ssh
, "Initialised %.200s client->server MAC algorithm",
5569 ssh
->csmac
->text_name
);
5570 if (ssh
->cscomp
->text_name
)
5571 logeventf(ssh
, "Initialised %s compression",
5572 ssh
->cscomp
->text_name
);
5575 * Now our end of the key exchange is complete, we can send all
5576 * our queued higher-layer packets.
5578 ssh
->queueing
= FALSE
;
5579 ssh2_pkt_queuesend(ssh
);
5582 * Expect SSH2_MSG_NEWKEYS from server.
5585 if (pktin
->type
!= SSH2_MSG_NEWKEYS
) {
5586 bombout(("expected new-keys packet from server"));
5589 ssh
->incoming_data_size
= 0; /* start counting from here */
5592 * We've seen server NEWKEYS, so create and initialise
5593 * server-to-client session keys.
5595 if (ssh
->sc_cipher_ctx
)
5596 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
5597 ssh
->sccipher
= s
->sccipher_tobe
;
5598 ssh
->sc_cipher_ctx
= ssh
->sccipher
->make_context();
5600 if (ssh
->sc_mac_ctx
)
5601 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
5602 ssh
->scmac
= s
->scmac_tobe
;
5603 ssh
->sc_mac_ctx
= ssh
->scmac
->make_context();
5605 if (ssh
->sc_comp_ctx
)
5606 ssh
->sccomp
->decompress_cleanup(ssh
->sc_comp_ctx
);
5607 ssh
->sccomp
= s
->sccomp_tobe
;
5608 ssh
->sc_comp_ctx
= ssh
->sccomp
->decompress_init();
5611 * Set IVs on server-to-client keys. Here we use the exchange
5612 * hash from the _first_ key exchange.
5615 unsigned char keyspace
[40];
5616 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'D',keyspace
);
5617 ssh
->sccipher
->setkey(ssh
->sc_cipher_ctx
, keyspace
);
5618 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'B',keyspace
);
5619 ssh
->sccipher
->setiv(ssh
->sc_cipher_ctx
, keyspace
);
5620 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'F',keyspace
);
5621 ssh
->scmac
->setkey(ssh
->sc_mac_ctx
, keyspace
);
5623 logeventf(ssh
, "Initialised %.200s server->client encryption",
5624 ssh
->sccipher
->text_name
);
5625 logeventf(ssh
, "Initialised %.200s server->client MAC algorithm",
5626 ssh
->scmac
->text_name
);
5627 if (ssh
->sccomp
->text_name
)
5628 logeventf(ssh
, "Initialised %s decompression",
5629 ssh
->sccomp
->text_name
);
5632 * Free key exchange data.
5636 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
5642 * Key exchange is over. Loop straight back round if we have a
5643 * deferred rekey reason.
5645 if (ssh
->deferred_rekey_reason
) {
5646 logevent(ssh
->deferred_rekey_reason
);
5648 ssh
->deferred_rekey_reason
= NULL
;
5649 goto begin_key_exchange
;
5653 * Otherwise, schedule a timer for our next rekey.
5655 ssh
->kex_in_progress
= FALSE
;
5656 ssh
->last_rekey
= GETTICKCOUNT();
5657 if (ssh
->cfg
.ssh_rekey_time
!= 0)
5658 ssh
->next_rekey
= schedule_timer(ssh
->cfg
.ssh_rekey_time
*60*TICKSPERSEC
,
5662 * If this is the first key exchange phase, we must pass the
5663 * SSH2_MSG_NEWKEYS packet to the next layer, not because it
5664 * wants to see it but because it will need time to initialise
5665 * itself before it sees an actual packet. In subsequent key
5666 * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because
5667 * it would only confuse the layer above.
5669 if (s
->activated_authconn
) {
5672 s
->activated_authconn
= TRUE
;
5675 * Now we're encrypting. Begin returning 1 to the protocol main
5676 * function so that other things can run on top of the
5677 * transport. If we ever see a KEXINIT, we must go back to the
5680 * We _also_ go back to the start if we see pktin==NULL and
5681 * inlen==-1, because this is a special signal meaning
5682 * `initiate client-driven rekey', and `in' contains a message
5683 * giving the reason for the rekey.
5685 while (!((pktin
&& pktin
->type
== SSH2_MSG_KEXINIT
) ||
5686 (!pktin
&& inlen
== -1))) {
5691 logevent("Server initiated key re-exchange");
5694 * Special case: if the server bug is set that doesn't
5695 * allow rekeying, we give a different log message and
5696 * continue waiting. (If such a server _initiates_ a rekey,
5697 * we process it anyway!)
5699 if ((ssh
->remote_bugs
& BUG_SSH2_REKEY
)) {
5700 logeventf(ssh
, "Server bug prevents key re-exchange (%s)",
5702 /* Reset the counters, so that at least this message doesn't
5703 * hit the event log _too_ often. */
5704 ssh
->outgoing_data_size
= 0;
5705 ssh
->incoming_data_size
= 0;
5706 if (ssh
->cfg
.ssh_rekey_time
!= 0) {
5708 schedule_timer(ssh
->cfg
.ssh_rekey_time
*60*TICKSPERSEC
,
5711 goto wait_for_rekey
; /* this is utterly horrid */
5713 logeventf(ssh
, "Initiating key re-exchange (%s)", (char *)in
);
5716 goto begin_key_exchange
;
5722 * Add data to an SSH-2 channel output buffer.
5724 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
,
5727 bufchain_add(&c
->v
.v2
.outbuffer
, buf
, len
);
5731 * Attempt to send data on an SSH-2 channel.
5733 static int ssh2_try_send(struct ssh_channel
*c
)
5736 struct Packet
*pktout
;
5738 while (c
->v
.v2
.remwindow
> 0 && bufchain_size(&c
->v
.v2
.outbuffer
) > 0) {
5741 bufchain_prefix(&c
->v
.v2
.outbuffer
, &data
, &len
);
5742 if ((unsigned)len
> c
->v
.v2
.remwindow
)
5743 len
= c
->v
.v2
.remwindow
;
5744 if ((unsigned)len
> c
->v
.v2
.remmaxpkt
)
5745 len
= c
->v
.v2
.remmaxpkt
;
5746 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA
);
5747 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5748 dont_log_data(ssh
, pktout
, PKTLOG_OMIT
);
5749 ssh2_pkt_addstring_start(pktout
);
5750 ssh2_pkt_addstring_data(pktout
, data
, len
);
5751 end_log_omission(ssh
, pktout
);
5752 ssh2_pkt_send(ssh
, pktout
);
5753 bufchain_consume(&c
->v
.v2
.outbuffer
, len
);
5754 c
->v
.v2
.remwindow
-= len
;
5758 * After having sent as much data as we can, return the amount
5761 return bufchain_size(&c
->v
.v2
.outbuffer
);
5764 static void ssh2_try_send_and_unthrottle(struct ssh_channel
*c
)
5768 return; /* don't send on closing channels */
5769 bufsize
= ssh2_try_send(c
);
5772 case CHAN_MAINSESSION
:
5773 /* stdin need not receive an unthrottle
5774 * notification since it will be polled */
5777 x11_unthrottle(c
->u
.x11
.s
);
5780 /* agent sockets are request/response and need no
5781 * buffer management */
5784 pfd_unthrottle(c
->u
.pfd
.s
);
5791 * Potentially enlarge the window on an SSH-2 channel.
5793 static void ssh2_set_window(struct ssh_channel
*c
, unsigned newwin
)
5798 * Never send WINDOW_ADJUST for a channel that the remote side
5799 * already thinks it's closed; there's no point, since it won't
5800 * be sending any more data anyway.
5806 * Only send a WINDOW_ADJUST if there's significantly more window
5807 * available than the other end thinks there is. This saves us
5808 * sending a WINDOW_ADJUST for every character in a shell session.
5810 * "Significant" is arbitrarily defined as half the window size.
5812 if (newwin
> c
->v
.v2
.locwindow
* 2) {
5813 struct Packet
*pktout
;
5815 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5816 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5817 ssh2_pkt_adduint32(pktout
, newwin
- c
->v
.v2
.locwindow
);
5818 ssh2_pkt_send(ssh
, pktout
);
5819 c
->v
.v2
.locwindow
= newwin
;
5823 static void ssh2_msg_channel_window_adjust(Ssh ssh
, struct Packet
*pktin
)
5825 unsigned i
= ssh_pkt_getuint32(pktin
);
5826 struct ssh_channel
*c
;
5827 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5828 if (c
&& !c
->closes
) {
5829 c
->v
.v2
.remwindow
+= ssh_pkt_getuint32(pktin
);
5830 ssh2_try_send_and_unthrottle(c
);
5834 static void ssh2_msg_channel_data(Ssh ssh
, struct Packet
*pktin
)
5838 unsigned i
= ssh_pkt_getuint32(pktin
);
5839 struct ssh_channel
*c
;
5840 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5842 return; /* nonexistent channel */
5843 if (pktin
->type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
&&
5844 ssh_pkt_getuint32(pktin
) != SSH2_EXTENDED_DATA_STDERR
)
5845 return; /* extended but not stderr */
5846 ssh_pkt_getstring(pktin
, &data
, &length
);
5849 c
->v
.v2
.locwindow
-= length
;
5851 case CHAN_MAINSESSION
:
5853 from_backend(ssh
->frontend
, pktin
->type
==
5854 SSH2_MSG_CHANNEL_EXTENDED_DATA
,
5858 bufsize
= x11_send(c
->u
.x11
.s
, data
, length
);
5861 bufsize
= pfd_send(c
->u
.pfd
.s
, data
, length
);
5864 while (length
> 0) {
5865 if (c
->u
.a
.lensofar
< 4) {
5866 unsigned int l
= min(4 - c
->u
.a
.lensofar
, length
);
5867 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
,
5871 c
->u
.a
.lensofar
+= l
;
5873 if (c
->u
.a
.lensofar
== 4) {
5875 4 + GET_32BIT(c
->u
.a
.msglen
);
5876 c
->u
.a
.message
= snewn(c
->u
.a
.totallen
,
5878 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
5880 if (c
->u
.a
.lensofar
>= 4 && length
> 0) {
5882 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
5884 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
,
5888 c
->u
.a
.lensofar
+= l
;
5890 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
5893 if (agent_query(c
->u
.a
.message
,
5896 ssh_agentf_callback
, c
))
5897 ssh_agentf_callback(c
, reply
, replylen
);
5898 sfree(c
->u
.a
.message
);
5899 c
->u
.a
.lensofar
= 0;
5906 * If we are not buffering too much data,
5907 * enlarge the window again at the remote side.
5909 if (bufsize
< OUR_V2_WINSIZE
)
5910 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
5914 static void ssh2_msg_channel_eof(Ssh ssh
, struct Packet
*pktin
)
5916 unsigned i
= ssh_pkt_getuint32(pktin
);
5917 struct ssh_channel
*c
;
5919 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5921 return; /* nonexistent channel */
5923 if (c
->type
== CHAN_X11
) {
5925 * Remote EOF on an X11 channel means we should
5926 * wrap up and close the channel ourselves.
5928 x11_close(c
->u
.x11
.s
);
5930 } else if (c
->type
== CHAN_AGENT
) {
5932 } else if (c
->type
== CHAN_SOCKDATA
) {
5933 pfd_close(c
->u
.pfd
.s
);
5938 static void ssh2_msg_channel_close(Ssh ssh
, struct Packet
*pktin
)
5940 unsigned i
= ssh_pkt_getuint32(pktin
);
5941 struct ssh_channel
*c
;
5942 struct Packet
*pktout
;
5944 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5945 if (!c
|| c
->halfopen
) {
5946 bombout(("Received CHANNEL_CLOSE for %s channel %d\n",
5947 c ?
"half-open" : "nonexistent", i
));
5950 /* Do pre-close processing on the channel. */
5952 case CHAN_MAINSESSION
:
5953 ssh
->mainchan
= NULL
;
5954 update_specials_menu(ssh
->frontend
);
5957 if (c
->u
.x11
.s
!= NULL
)
5958 x11_close(c
->u
.x11
.s
);
5965 if (c
->u
.pfd
.s
!= NULL
)
5966 pfd_close(c
->u
.pfd
.s
);
5970 if (c
->closes
== 0) {
5971 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
5972 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5973 ssh2_pkt_send(ssh
, pktout
);
5975 del234(ssh
->channels
, c
);
5976 bufchain_clear(&c
->v
.v2
.outbuffer
);
5980 * See if that was the last channel left open.
5981 * (This is only our termination condition if we're
5982 * not running in -N mode.)
5984 if (!ssh
->cfg
.ssh_no_shell
&& count234(ssh
->channels
) == 0) {
5985 logevent("All channels closed. Disconnecting");
5988 * We used to send SSH_MSG_DISCONNECT here,
5989 * because I'd believed that _every_ conforming
5990 * SSH-2 connection had to end with a disconnect
5991 * being sent by at least one side; apparently
5992 * I was wrong and it's perfectly OK to
5993 * unceremoniously slam the connection shut
5994 * when you're done, and indeed OpenSSH feels
5995 * this is more polite than sending a
5996 * DISCONNECT. So now we don't.
5998 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
5999 ssh2_pkt_adduint32(s
->pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
6000 ssh2_pkt_addstring(s
->pktout
, "All open channels closed");
6001 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
6002 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
6004 ssh
->close_expected
= TRUE
;
6005 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6009 static void ssh2_msg_channel_open_confirmation(Ssh ssh
, struct Packet
*pktin
)
6011 unsigned i
= ssh_pkt_getuint32(pktin
);
6012 struct ssh_channel
*c
;
6013 struct Packet
*pktout
;
6015 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
6017 return; /* nonexistent channel */
6018 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
6019 return; /* dunno why they're confirming this */
6020 c
->remoteid
= ssh_pkt_getuint32(pktin
);
6021 c
->halfopen
= FALSE
;
6022 c
->type
= CHAN_SOCKDATA
;
6023 c
->v
.v2
.remwindow
= ssh_pkt_getuint32(pktin
);
6024 c
->v
.v2
.remmaxpkt
= ssh_pkt_getuint32(pktin
);
6026 pfd_confirm(c
->u
.pfd
.s
);
6029 * We have a pending close on this channel,
6030 * which we decided on before the server acked
6031 * the channel open. So now we know the
6032 * remoteid, we can close it again.
6034 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
6035 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
6036 ssh2_pkt_send(ssh
, pktout
);
6040 static void ssh2_msg_channel_open_failure(Ssh ssh
, struct Packet
*pktin
)
6042 static const char *const reasons
[] = {
6043 "<unknown reason code>",
6044 "Administratively prohibited",
6046 "Unknown channel type",
6047 "Resource shortage",
6049 unsigned i
= ssh_pkt_getuint32(pktin
);
6050 unsigned reason_code
;
6051 char *reason_string
;
6053 struct ssh_channel
*c
;
6054 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
6056 return; /* nonexistent channel */
6057 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
6058 return; /* dunno why they're failing this */
6060 reason_code
= ssh_pkt_getuint32(pktin
);
6061 if (reason_code
>= lenof(reasons
))
6062 reason_code
= 0; /* ensure reasons[reason_code] in range */
6063 ssh_pkt_getstring(pktin
, &reason_string
, &reason_length
);
6064 logeventf(ssh
, "Forwarded connection refused by server: %s [%.*s]",
6065 reasons
[reason_code
], reason_length
, reason_string
);
6067 pfd_close(c
->u
.pfd
.s
);
6069 del234(ssh
->channels
, c
);
6073 static void ssh2_msg_channel_request(Ssh ssh
, struct Packet
*pktin
)
6077 int typelen
, want_reply
;
6078 int reply
= SSH2_MSG_CHANNEL_FAILURE
; /* default */
6079 struct ssh_channel
*c
;
6080 struct Packet
*pktout
;
6082 localid
= ssh_pkt_getuint32(pktin
);
6083 ssh_pkt_getstring(pktin
, &type
, &typelen
);
6084 want_reply
= ssh2_pkt_getbool(pktin
);
6087 * First, check that the channel exists. Otherwise,
6088 * we can instantly disconnect with a rude message.
6090 c
= find234(ssh
->channels
, &localid
, ssh_channelfind
);
6093 sprintf(buf
, "Received channel request for nonexistent"
6094 " channel %d", localid
);
6096 pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
6097 ssh2_pkt_adduint32(pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
6098 ssh2_pkt_addstring(pktout
, buf
);
6099 ssh2_pkt_addstring(pktout
, "en"); /* language tag */
6100 ssh2_pkt_send_noqueue(ssh
, pktout
);
6101 connection_fatal(ssh
->frontend
, "%s", buf
);
6102 ssh
->close_expected
= TRUE
;
6103 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6108 * Having got the channel number, we now look at
6109 * the request type string to see if it's something
6112 if (c
== ssh
->mainchan
) {
6114 * We recognise "exit-status" and "exit-signal" on
6115 * the primary channel.
6117 if (typelen
== 11 &&
6118 !memcmp(type
, "exit-status", 11)) {
6120 ssh
->exitcode
= ssh_pkt_getuint32(pktin
);
6121 logeventf(ssh
, "Server sent command exit status %d",
6123 reply
= SSH2_MSG_CHANNEL_SUCCESS
;
6125 } else if (typelen
== 11 &&
6126 !memcmp(type
, "exit-signal", 11)) {
6128 int is_plausible
= TRUE
, is_int
= FALSE
;
6129 char *fmt_sig
= "", *fmt_msg
= "";
6131 int msglen
= 0, core
= FALSE
;
6132 /* ICK: older versions of OpenSSH (e.g. 3.4p1)
6133 * provide an `int' for the signal, despite its
6134 * having been a `string' in the drafts since at
6135 * least 2001. (Fixed in session.c 1.147.) Try to
6136 * infer which we can safely parse it as. */
6138 unsigned char *p
= pktin
->body
+
6140 long len
= pktin
->length
- pktin
->savedpos
;
6141 unsigned long num
= GET_32BIT(p
); /* what is it? */
6142 /* If it's 0, it hardly matters; assume string */
6146 int maybe_int
= FALSE
, maybe_str
= FALSE
;
6147 #define CHECK_HYPOTHESIS(offset, result) \
6150 if (q >= 0 && q+4 <= len) { \
6151 q = q + 4 + GET_32BIT(p+q); \
6152 if (q >= 0 && q+4 <= len && \
6153 ((q = q + 4 + GET_32BIT(p+q))!= 0) && q == len) \
6157 CHECK_HYPOTHESIS(4+1, maybe_int
);
6158 CHECK_HYPOTHESIS(4+num
+1, maybe_str
);
6159 #undef CHECK_HYPOTHESIS
6160 if (maybe_int
&& !maybe_str
)
6162 else if (!maybe_int
&& maybe_str
)
6165 /* Crikey. Either or neither. Panic. */
6166 is_plausible
= FALSE
;
6171 /* Old non-standard OpenSSH. */
6172 int signum
= ssh_pkt_getuint32(pktin
);
6173 fmt_sig
= dupprintf(" %d", signum
);
6175 /* As per the drafts. */
6178 ssh_pkt_getstring(pktin
, &sig
, &siglen
);
6179 /* Signal name isn't supposed to be blank, but
6180 * let's cope gracefully if it is. */
6182 fmt_sig
= dupprintf(" \"%.*s\"",
6186 core
= ssh2_pkt_getbool(pktin
);
6187 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
6189 fmt_msg
= dupprintf(" (\"%.*s\")", msglen
, msg
);
6191 /* ignore lang tag */
6192 } /* else don't attempt to parse */
6193 logeventf(ssh
, "Server exited on signal%s%s%s",
6194 fmt_sig
, core ?
" (core dumped)" : "",
6196 if (*fmt_sig
) sfree(fmt_sig
);
6197 if (*fmt_msg
) sfree(fmt_msg
);
6198 reply
= SSH2_MSG_CHANNEL_SUCCESS
;
6203 * This is a channel request we don't know
6204 * about, so we now either ignore the request
6205 * or respond with CHANNEL_FAILURE, depending
6208 reply
= SSH2_MSG_CHANNEL_FAILURE
;
6211 pktout
= ssh2_pkt_init(reply
);
6212 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
6213 ssh2_pkt_send(ssh
, pktout
);
6217 static void ssh2_msg_global_request(Ssh ssh
, struct Packet
*pktin
)
6220 int typelen
, want_reply
;
6221 struct Packet
*pktout
;
6223 ssh_pkt_getstring(pktin
, &type
, &typelen
);
6224 want_reply
= ssh2_pkt_getbool(pktin
);
6227 * We currently don't support any global requests
6228 * at all, so we either ignore the request or
6229 * respond with REQUEST_FAILURE, depending on
6233 pktout
= ssh2_pkt_init(SSH2_MSG_REQUEST_FAILURE
);
6234 ssh2_pkt_send(ssh
, pktout
);
6238 static void ssh2_msg_channel_open(Ssh ssh
, struct Packet
*pktin
)
6246 struct ssh_channel
*c
;
6247 unsigned remid
, winsize
, pktsize
;
6248 struct Packet
*pktout
;
6250 ssh_pkt_getstring(pktin
, &type
, &typelen
);
6251 c
= snew(struct ssh_channel
);
6254 remid
= ssh_pkt_getuint32(pktin
);
6255 winsize
= ssh_pkt_getuint32(pktin
);
6256 pktsize
= ssh_pkt_getuint32(pktin
);
6258 if (typelen
== 3 && !memcmp(type
, "x11", 3)) {
6261 ssh_pkt_getstring(pktin
, &peeraddr
, &peeraddrlen
);
6262 addrstr
= snewn(peeraddrlen
+1, char);
6263 memcpy(addrstr
, peeraddr
, peeraddrlen
);
6264 addrstr
[peeraddrlen
] = '\0';
6265 peerport
= ssh_pkt_getuint32(pktin
);
6267 logeventf(ssh
, "Received X11 connect request from %s:%d",
6270 if (!ssh
->X11_fwd_enabled
)
6271 error
= "X11 forwarding is not enabled";
6272 else if (x11_init(&c
->u
.x11
.s
, ssh
->cfg
.x11_display
, c
,
6273 ssh
->x11auth
, addrstr
, peerport
,
6274 &ssh
->cfg
) != NULL
) {
6275 error
= "Unable to open an X11 connection";
6277 logevent("Opening X11 forward connection succeeded");
6282 } else if (typelen
== 15 &&
6283 !memcmp(type
, "forwarded-tcpip", 15)) {
6284 struct ssh_rportfwd pf
, *realpf
;
6287 ssh_pkt_getstring(pktin
, &dummy
, &dummylen
);/* skip address */
6288 pf
.sport
= ssh_pkt_getuint32(pktin
);
6289 ssh_pkt_getstring(pktin
, &peeraddr
, &peeraddrlen
);
6290 peerport
= ssh_pkt_getuint32(pktin
);
6291 realpf
= find234(ssh
->rportfwds
, &pf
, NULL
);
6292 logeventf(ssh
, "Received remote port %d open request "
6293 "from %s:%d", pf
.sport
, peeraddr
, peerport
);
6294 if (realpf
== NULL
) {
6295 error
= "Remote port is not recognised";
6297 const char *e
= pfd_newconnect(&c
->u
.pfd
.s
,
6301 realpf
->pfrec
->addressfamily
);
6302 logeventf(ssh
, "Attempting to forward remote port to "
6303 "%s:%d", realpf
->dhost
, realpf
->dport
);
6305 logeventf(ssh
, "Port open failed: %s", e
);
6306 error
= "Port open failed";
6308 logevent("Forwarded port opened successfully");
6309 c
->type
= CHAN_SOCKDATA
;
6312 } else if (typelen
== 22 &&
6313 !memcmp(type
, "auth-agent@openssh.com", 3)) {
6314 if (!ssh
->agentfwd_enabled
)
6315 error
= "Agent forwarding is not enabled";
6317 c
->type
= CHAN_AGENT
; /* identify channel type */
6318 c
->u
.a
.lensofar
= 0;
6321 error
= "Unsupported channel type requested";
6324 c
->remoteid
= remid
;
6325 c
->halfopen
= FALSE
;
6327 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_FAILURE
);
6328 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
6329 ssh2_pkt_adduint32(pktout
, SSH2_OPEN_CONNECT_FAILED
);
6330 ssh2_pkt_addstring(pktout
, error
);
6331 ssh2_pkt_addstring(pktout
, "en"); /* language tag */
6332 ssh2_pkt_send(ssh
, pktout
);
6333 logeventf(ssh
, "Rejected channel open: %s", error
);
6336 c
->localid
= alloc_channel_id(ssh
);
6338 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
6339 c
->v
.v2
.remwindow
= winsize
;
6340 c
->v
.v2
.remmaxpkt
= pktsize
;
6341 bufchain_init(&c
->v
.v2
.outbuffer
);
6342 add234(ssh
->channels
, c
);
6343 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
);
6344 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
6345 ssh2_pkt_adduint32(pktout
, c
->localid
);
6346 ssh2_pkt_adduint32(pktout
, c
->v
.v2
.locwindow
);
6347 ssh2_pkt_adduint32(pktout
, OUR_V2_MAXPKT
); /* our max pkt size */
6348 ssh2_pkt_send(ssh
, pktout
);
6352 /* Helper function to deal with sending tty modes for "pty-req" */
6353 static void ssh2_send_ttymode(void *data
, char *mode
, char *val
)
6355 struct Packet
*pktout
= (struct Packet
*)data
;
6357 unsigned int arg
= 0;
6358 while (strcmp(mode
, ssh_ttymodes
[i
].mode
) != 0) i
++;
6359 if (i
== lenof(ssh_ttymodes
)) return;
6360 switch (ssh_ttymodes
[i
].type
) {
6362 arg
= ssh_tty_parse_specchar(val
);
6365 arg
= ssh_tty_parse_boolean(val
);
6368 ssh2_pkt_addbyte(pktout
, ssh_ttymodes
[i
].opcode
);
6369 ssh2_pkt_adduint32(pktout
, arg
);
6373 * Handle the SSH-2 userauth and connection layers.
6375 static void do_ssh2_authconn(Ssh ssh
, unsigned char *in
, int inlen
,
6376 struct Packet
*pktin
)
6378 struct do_ssh2_authconn_state
{
6380 AUTH_INVALID
, AUTH_PUBLICKEY_AGENT
, AUTH_PUBLICKEY_FILE
,
6382 AUTH_KEYBOARD_INTERACTIVE
6386 AUTH_TYPE_PUBLICKEY
,
6387 AUTH_TYPE_PUBLICKEY_OFFER_LOUD
,
6388 AUTH_TYPE_PUBLICKEY_OFFER_QUIET
,
6390 AUTH_TYPE_KEYBOARD_INTERACTIVE
,
6391 AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
6393 int gotit
, need_pw
, can_pubkey
, can_passwd
, can_keyb_inter
;
6394 int tried_pubkey_config
, tried_agent
;
6395 int kbd_inter_running
, kbd_inter_refused
;
6397 int num_prompts
, curr_prompt
, echo
;
6402 void *publickey_blob
;
6403 int publickey_bloblen
;
6404 unsigned char request
[5], *response
, *p
;
6408 char *pkblob
, *alg
, *commentp
;
6409 int pklen
, alglen
, commentlen
;
6410 int siglen
, retlen
, len
;
6411 char *q
, *agentreq
, *ret
;
6413 int num_env
, env_left
, env_ok
;
6414 struct Packet
*pktout
;
6416 crState(do_ssh2_authconn_state
);
6418 crBegin(ssh
->do_ssh2_authconn_crstate
);
6421 * Request userauth protocol, and await a response to it.
6423 s
->pktout
= ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST
);
6424 ssh2_pkt_addstring(s
->pktout
, "ssh-userauth");
6425 ssh2_pkt_send(ssh
, s
->pktout
);
6426 crWaitUntilV(pktin
);
6427 if (pktin
->type
!= SSH2_MSG_SERVICE_ACCEPT
) {
6428 bombout(("Server refused user authentication protocol"));
6433 * We repeat this whole loop, including the username prompt,
6434 * until we manage a successful authentication. If the user
6435 * types the wrong _password_, they can be sent back to the
6436 * beginning to try another username, if this is configured on.
6437 * (If they specify a username in the config, they are never
6438 * asked, even if they do give a wrong password.)
6440 * I think this best serves the needs of
6442 * - the people who have no configuration, no keys, and just
6443 * want to try repeated (username,password) pairs until they
6444 * type both correctly
6446 * - people who have keys and configuration but occasionally
6447 * need to fall back to passwords
6449 * - people with a key held in Pageant, who might not have
6450 * logged in to a particular machine before; so they want to
6451 * type a username, and then _either_ their key will be
6452 * accepted, _or_ they will type a password. If they mistype
6453 * the username they will want to be able to get back and
6456 s
->username
[0] = '\0';
6457 s
->got_username
= FALSE
;
6462 if (s
->got_username
&& !ssh
->cfg
.change_username
) {
6464 * We got a username last time round this loop, and
6465 * with change_username turned off we don't try to get
6468 } else if (!*ssh
->cfg
.username
) {
6469 if (ssh_get_line
&& !ssh_getline_pw_only
) {
6470 if (!ssh_get_line("login as: ",
6471 s
->username
, sizeof(s
->username
), FALSE
)) {
6473 * get_line failed to get a username.
6476 logevent("No username provided. Abandoning session.");
6477 ssh
->close_expected
= TRUE
;
6478 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6482 int ret
; /* need not be saved across crReturn */
6483 c_write_str(ssh
, "login as: ");
6485 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
6487 crWaitUntilV(!pktin
);
6488 ret
= process_userpass_input(ssh
, in
, inlen
);
6492 c_write_str(ssh
, "\r\n");
6494 s
->username
[strcspn(s
->username
, "\n\r")] = '\0';
6497 strncpy(s
->username
, ssh
->cfg
.username
, sizeof(s
->username
));
6498 s
->username
[sizeof(s
->username
)-1] = '\0';
6499 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
6500 stuff
= dupprintf("Using username \"%s\".\r\n", s
->username
);
6501 c_write_str(ssh
, stuff
);
6505 s
->got_username
= TRUE
;
6508 * Send an authentication request using method "none": (a)
6509 * just in case it succeeds, and (b) so that we know what
6510 * authentication methods we can usefully try next.
6512 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6514 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6515 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6516 ssh2_pkt_addstring(s
->pktout
, "ssh-connection");/* service requested */
6517 ssh2_pkt_addstring(s
->pktout
, "none"); /* method */
6518 ssh2_pkt_send(ssh
, s
->pktout
);
6519 s
->type
= AUTH_TYPE_NONE
;
6521 s
->we_are_in
= FALSE
;
6523 s
->tried_pubkey_config
= FALSE
;
6524 s
->tried_agent
= FALSE
;
6525 s
->kbd_inter_running
= FALSE
;
6526 s
->kbd_inter_refused
= FALSE
;
6527 /* Load the pub half of ssh->cfg.keyfile so we notice if it's in Pageant */
6528 if (!filename_is_null(ssh
->cfg
.keyfile
)) {
6530 logeventf(ssh
, "Reading private key file \"%.150s\"",
6531 filename_to_str(&ssh
->cfg
.keyfile
));
6532 keytype
= key_type(&ssh
->cfg
.keyfile
);
6533 if (keytype
== SSH_KEYTYPE_SSH2
) {
6535 ssh2_userkey_loadpub(&ssh
->cfg
.keyfile
, NULL
,
6536 &s
->publickey_bloblen
, NULL
);
6539 logeventf(ssh
, "Unable to use this key file (%s)",
6540 key_type_to_str(keytype
));
6541 msgbuf
= dupprintf("Unable to use key file \"%.150s\""
6543 filename_to_str(&ssh
->cfg
.keyfile
),
6544 key_type_to_str(keytype
));
6545 c_write_str(ssh
, msgbuf
);
6547 s
->publickey_blob
= NULL
;
6550 s
->publickey_blob
= NULL
;
6554 * Wait for the result of the last authentication request.
6557 crWaitUntilV(pktin
);
6558 while (pktin
->type
== SSH2_MSG_USERAUTH_BANNER
) {
6562 * Don't show the banner if we're operating in
6563 * non-verbose non-interactive mode. (It's probably
6564 * a script, which means nobody will read the
6565 * banner _anyway_, and moreover the printing of
6566 * the banner will screw up processing on the
6567 * output of (say) plink.)
6569 if (flags
& (FLAG_VERBOSE
| FLAG_INTERACTIVE
)) {
6570 ssh_pkt_getstring(pktin
, &banner
, &size
);
6572 c_write_untrusted(ssh
, banner
, size
);
6574 crWaitUntilV(pktin
);
6576 if (pktin
->type
== SSH2_MSG_USERAUTH_SUCCESS
) {
6577 logevent("Access granted");
6578 s
->we_are_in
= TRUE
;
6582 if (s
->kbd_inter_running
&&
6583 pktin
->type
== SSH2_MSG_USERAUTH_INFO_REQUEST
) {
6585 * This is either a further set-of-prompts packet
6586 * in keyboard-interactive authentication, or it's
6587 * the same one and we came back here with `gotit'
6588 * set. In the former case, we must reset the
6589 * curr_prompt variable.
6593 } else if (pktin
->type
== SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ
) {
6594 /* FIXME: perhaps we should support this? */
6595 bombout(("PASSWD_CHANGEREQ not yet supported"));
6597 } else if (pktin
->type
!= SSH2_MSG_USERAUTH_FAILURE
) {
6598 bombout(("Strange packet received during authentication: type %d",
6606 * OK, we're now sitting on a USERAUTH_FAILURE message, so
6607 * we can look at the string in it and know what we can
6608 * helpfully try next.
6610 if (pktin
->type
== SSH2_MSG_USERAUTH_FAILURE
) {
6613 ssh_pkt_getstring(pktin
, &methods
, &methlen
);
6614 s
->kbd_inter_running
= FALSE
;
6615 if (!ssh2_pkt_getbool(pktin
)) {
6617 * We have received an unequivocal Access
6618 * Denied. This can translate to a variety of
6621 * - if we'd just tried "none" authentication,
6622 * it's not worth printing anything at all
6624 * - if we'd just tried a public key _offer_,
6625 * the message should be "Server refused our
6626 * key" (or no message at all if the key
6627 * came from Pageant)
6629 * - if we'd just tried anything else, the
6630 * message really should be "Access denied".
6632 * Additionally, if we'd just tried password
6633 * authentication, we should break out of this
6634 * whole loop so as to go back to the username
6635 * prompt (iff we're configured to allow
6636 * username change attempts).
6638 if (s
->type
== AUTH_TYPE_NONE
) {
6640 } else if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
||
6641 s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_QUIET
) {
6642 if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
)
6643 c_write_str(ssh
, "Server refused our key\r\n");
6644 logevent("Server refused public key");
6645 } else if (s
->type
==AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
) {
6646 /* server declined keyboard-interactive; ignore */
6648 c_write_str(ssh
, "Access denied\r\n");
6649 logevent("Access denied");
6650 if (s
->type
== AUTH_TYPE_PASSWORD
&&
6651 ssh
->cfg
.change_username
) {
6652 /* XXX perhaps we should allow
6653 * keyboard-interactive to do this too? */
6654 s
->we_are_in
= FALSE
;
6659 c_write_str(ssh
, "Further authentication required\r\n");
6660 logevent("Further authentication required");
6664 in_commasep_string("publickey", methods
, methlen
);
6666 in_commasep_string("password", methods
, methlen
);
6667 s
->can_keyb_inter
= ssh
->cfg
.try_ki_auth
&&
6668 in_commasep_string("keyboard-interactive", methods
, methlen
);
6672 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6676 * Most password/passphrase prompts will be
6677 * non-echoing, so we set this to 0 by default.
6678 * Exception is that some keyboard-interactive prompts
6679 * can be echoing, in which case we'll set this to 1.
6683 if (!s
->method
&& s
->can_pubkey
&&
6684 agent_exists() && !s
->tried_agent
) {
6686 * Attempt public-key authentication using Pageant.
6691 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6692 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
6694 s
->tried_agent
= TRUE
;
6696 logevent("Pageant is running. Requesting keys.");
6698 /* Request the keys held by the agent. */
6699 PUT_32BIT(s
->request
, 1);
6700 s
->request
[4] = SSH2_AGENTC_REQUEST_IDENTITIES
;
6701 if (!agent_query(s
->request
, 5, &r
, &s
->responselen
,
6702 ssh_agent_callback
, ssh
)) {
6706 bombout(("Unexpected data from server while"
6707 " waiting for agent response"));
6710 } while (pktin
|| inlen
> 0);
6711 r
= ssh
->agent_response
;
6712 s
->responselen
= ssh
->agent_response_len
;
6714 s
->response
= (unsigned char *) r
;
6715 if (s
->response
&& s
->responselen
>= 5 &&
6716 s
->response
[4] == SSH2_AGENT_IDENTITIES_ANSWER
) {
6717 s
->p
= s
->response
+ 5;
6718 s
->nkeys
= GET_32BIT(s
->p
);
6720 logeventf(ssh
, "Pageant has %d SSH-2 keys", s
->nkeys
);
6721 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
6724 logeventf(ssh
, "Trying Pageant key #%d", s
->keyi
);
6725 s
->pklen
= GET_32BIT(s
->p
);
6727 if (s
->publickey_blob
&&
6728 s
->pklen
== s
->publickey_bloblen
&&
6729 !memcmp(s
->p
, s
->publickey_blob
,
6730 s
->publickey_bloblen
)) {
6731 logevent("This key matches configured key file");
6732 s
->tried_pubkey_config
= 1;
6734 s
->pkblob
= (char *)s
->p
;
6736 s
->alglen
= GET_32BIT(s
->pkblob
);
6737 s
->alg
= s
->pkblob
+ 4;
6738 s
->commentlen
= GET_32BIT(s
->p
);
6740 s
->commentp
= (char *)s
->p
;
6741 s
->p
+= s
->commentlen
;
6742 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6743 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6744 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6745 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6746 ssh2_pkt_addbool(s
->pktout
, FALSE
); /* no signature included */
6747 ssh2_pkt_addstring_start(s
->pktout
);
6748 ssh2_pkt_addstring_data(s
->pktout
, s
->alg
, s
->alglen
);
6749 ssh2_pkt_addstring_start(s
->pktout
);
6750 ssh2_pkt_addstring_data(s
->pktout
, s
->pkblob
, s
->pklen
);
6751 ssh2_pkt_send(ssh
, s
->pktout
);
6753 crWaitUntilV(pktin
);
6754 if (pktin
->type
!= SSH2_MSG_USERAUTH_PK_OK
) {
6755 logevent("Key refused");
6759 if (flags
& FLAG_VERBOSE
) {
6760 c_write_str(ssh
, "Authenticating with "
6762 c_write(ssh
, s
->commentp
, s
->commentlen
);
6763 c_write_str(ssh
, "\" from agent\r\n");
6767 * Server is willing to accept the key.
6768 * Construct a SIGN_REQUEST.
6770 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6771 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6772 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6773 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6774 ssh2_pkt_addbool(s
->pktout
, TRUE
);
6775 ssh2_pkt_addstring_start(s
->pktout
);
6776 ssh2_pkt_addstring_data(s
->pktout
, s
->alg
, s
->alglen
);
6777 ssh2_pkt_addstring_start(s
->pktout
);
6778 ssh2_pkt_addstring_data(s
->pktout
, s
->pkblob
, s
->pklen
);
6780 s
->siglen
= s
->pktout
->length
- 5 + 4 + 20;
6781 if (ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)
6783 s
->len
= 1; /* message type */
6784 s
->len
+= 4 + s
->pklen
; /* key blob */
6785 s
->len
+= 4 + s
->siglen
; /* data to sign */
6786 s
->len
+= 4; /* flags */
6787 s
->agentreq
= snewn(4 + s
->len
, char);
6788 PUT_32BIT(s
->agentreq
, s
->len
);
6789 s
->q
= s
->agentreq
+ 4;
6790 *s
->q
++ = SSH2_AGENTC_SIGN_REQUEST
;
6791 PUT_32BIT(s
->q
, s
->pklen
);
6793 memcpy(s
->q
, s
->pkblob
, s
->pklen
);
6795 PUT_32BIT(s
->q
, s
->siglen
);
6797 /* Now the data to be signed... */
6798 if (!(ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)) {
6799 PUT_32BIT(s
->q
, 20);
6802 memcpy(s
->q
, ssh
->v2_session_id
, 20);
6804 memcpy(s
->q
, s
->pktout
->data
+ 5,
6805 s
->pktout
->length
- 5);
6806 s
->q
+= s
->pktout
->length
- 5;
6807 /* And finally the (zero) flags word. */
6809 if (!agent_query(s
->agentreq
, s
->len
+ 4,
6811 ssh_agent_callback
, ssh
)) {
6815 bombout(("Unexpected data from server"
6816 " while waiting for agent"
6820 } while (pktin
|| inlen
> 0);
6821 vret
= ssh
->agent_response
;
6822 s
->retlen
= ssh
->agent_response_len
;
6827 if (s
->ret
[4] == SSH2_AGENT_SIGN_RESPONSE
) {
6828 logevent("Sending Pageant's response");
6829 ssh2_add_sigblob(ssh
, s
->pktout
,
6830 s
->pkblob
, s
->pklen
,
6832 GET_32BIT(s
->ret
+ 5));
6833 ssh2_pkt_send(ssh
, s
->pktout
);
6838 ("Pageant failed to answer challenge");
6849 if (!s
->method
&& s
->can_pubkey
&& s
->publickey_blob
6850 && !s
->tried_pubkey_config
) {
6851 unsigned char *pub_blob
;
6852 char *algorithm
, *comment
;
6855 s
->tried_pubkey_config
= TRUE
;
6857 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6858 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
6861 * Try the public key supplied in the configuration.
6863 * First, offer the public blob to see if the server is
6864 * willing to accept it.
6867 (unsigned char *)ssh2_userkey_loadpub(&ssh
->cfg
.keyfile
,
6872 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6873 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6874 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6875 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6876 ssh2_pkt_addbool(s
->pktout
, FALSE
); /* no signature included */
6877 ssh2_pkt_addstring(s
->pktout
, algorithm
);
6878 ssh2_pkt_addstring_start(s
->pktout
);
6879 ssh2_pkt_addstring_data(s
->pktout
, (char *)pub_blob
,
6881 ssh2_pkt_send(ssh
, s
->pktout
);
6882 logevent("Offered public key");
6884 crWaitUntilV(pktin
);
6885 if (pktin
->type
!= SSH2_MSG_USERAUTH_PK_OK
) {
6887 s
->type
= AUTH_TYPE_PUBLICKEY_OFFER_LOUD
;
6888 continue; /* key refused; give up on it */
6891 logevent("Offer of public key accepted");
6893 * Actually attempt a serious authentication using
6896 if (ssh2_userkey_encrypted(&ssh
->cfg
.keyfile
, &comment
)) {
6897 sprintf(s
->pwprompt
,
6898 "Passphrase for key \"%.100s\": ",
6904 if (flags
& FLAG_VERBOSE
) {
6905 c_write_str(ssh
, "Authenticating with public key \"");
6906 c_write_str(ssh
, comment
);
6907 c_write_str(ssh
, "\"\r\n");
6909 s
->method
= AUTH_PUBLICKEY_FILE
;
6913 if (!s
->method
&& s
->can_keyb_inter
&& !s
->kbd_inter_refused
&&
6914 !s
->kbd_inter_running
) {
6915 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
6916 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
6918 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6919 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
6921 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6922 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6923 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6924 ssh2_pkt_addstring(s
->pktout
, "keyboard-interactive"); /* method */
6925 ssh2_pkt_addstring(s
->pktout
, ""); /* lang */
6926 ssh2_pkt_addstring(s
->pktout
, "");
6927 ssh2_pkt_send(ssh
, s
->pktout
);
6929 crWaitUntilV(pktin
);
6930 if (pktin
->type
!= SSH2_MSG_USERAUTH_INFO_REQUEST
) {
6931 if (pktin
->type
== SSH2_MSG_USERAUTH_FAILURE
)
6933 logevent("Keyboard-interactive authentication refused");
6934 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
;
6935 s
->kbd_inter_refused
= TRUE
; /* don't try it again */
6939 c_write_str(ssh
, "Using keyboard-interactive authentication.\r\n");
6940 s
->kbd_inter_running
= TRUE
;
6944 if (s
->kbd_inter_running
) {
6945 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
6946 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
6948 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6949 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
6951 if (s
->curr_prompt
== 0) {
6953 * We've got a fresh USERAUTH_INFO_REQUEST.
6954 * Display header data, and start going through
6957 char *name
, *inst
, *lang
;
6958 int name_len
, inst_len
, lang_len
;
6960 ssh_pkt_getstring(pktin
, &name
, &name_len
);
6961 ssh_pkt_getstring(pktin
, &inst
, &inst_len
);
6962 ssh_pkt_getstring(pktin
, &lang
, &lang_len
);
6964 c_write_untrusted(ssh
, name
, name_len
);
6965 c_write_str(ssh
, "\r\n");
6968 c_write_untrusted(ssh
, inst
, inst_len
);
6969 c_write_str(ssh
, "\r\n");
6971 s
->num_prompts
= ssh_pkt_getuint32(pktin
);
6975 * If there are prompts remaining in the packet,
6976 * display one and get a response.
6978 if (s
->curr_prompt
< s
->num_prompts
) {
6982 ssh_pkt_getstring(pktin
, &prompt
, &prompt_len
);
6983 if (prompt_len
> 0) {
6984 static const char trunc
[] = "<prompt truncated>: ";
6985 static const int prlen
= sizeof(s
->pwprompt
) -
6987 if (prompt_len
> prlen
) {
6988 memcpy(s
->pwprompt
, prompt
, prlen
);
6989 strcpy(s
->pwprompt
+ prlen
, trunc
);
6991 memcpy(s
->pwprompt
, prompt
, prompt_len
);
6992 s
->pwprompt
[prompt_len
] = '\0';
6996 "<server failed to send prompt>: ");
6998 s
->echo
= ssh2_pkt_getbool(pktin
);
7004 if (!s
->method
&& s
->can_passwd
) {
7005 s
->method
= AUTH_PASSWORD
;
7006 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
7007 ssh
->pkt_ctx
|= SSH2_PKTCTX_PASSWORD
;
7008 sprintf(s
->pwprompt
, "%.90s@%.90s's password: ", s
->username
,
7015 if (!ssh_get_line(s
->pwprompt
, s
->password
,
7016 sizeof(s
->password
), TRUE
)) {
7018 * get_line failed to get a password (for
7019 * example because one was supplied on the
7020 * command line which has already failed to
7023 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
7024 ssh2_pkt_adduint32(s
->pktout
,SSH2_DISCONNECT_BY_APPLICATION
);
7025 ssh2_pkt_addstring(s
->pktout
, "No more passwords available"
7027 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
7028 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
7029 logevent("Unable to authenticate");
7030 connection_fatal(ssh
->frontend
,
7031 "Unable to authenticate");
7032 ssh
->close_expected
= TRUE
;
7033 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
7037 int ret
; /* need not be saved across crReturn */
7038 c_write_untrusted(ssh
, s
->pwprompt
, strlen(s
->pwprompt
));
7041 setup_userpass_input(ssh
, s
->password
,
7042 sizeof(s
->password
), s
->echo
);
7044 crWaitUntilV(!pktin
);
7045 ret
= process_userpass_input(ssh
, in
, inlen
);
7049 c_write_str(ssh
, "\r\n");
7053 if (s
->method
== AUTH_PUBLICKEY_FILE
) {
7055 * We have our passphrase. Now try the actual authentication.
7057 struct ssh2_userkey
*key
;
7058 const char *error
= NULL
;
7060 key
= ssh2_load_userkey(&ssh
->cfg
.keyfile
, s
->password
,
7062 if (key
== SSH2_WRONG_PASSPHRASE
|| key
== NULL
) {
7063 if (key
== SSH2_WRONG_PASSPHRASE
) {
7064 c_write_str(ssh
, "Wrong passphrase\r\n");
7065 s
->tried_pubkey_config
= FALSE
;
7067 c_write_str(ssh
, "Unable to load private key (");
7068 c_write_str(ssh
, error
);
7069 c_write_str(ssh
, ")\r\n");
7070 s
->tried_pubkey_config
= TRUE
;
7072 /* Send a spurious AUTH_NONE to return to the top. */
7073 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
7074 ssh2_pkt_addstring(s
->pktout
, s
->username
);
7075 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
7076 ssh2_pkt_addstring(s
->pktout
, "none"); /* method */
7077 ssh2_pkt_send(ssh
, s
->pktout
);
7078 s
->type
= AUTH_TYPE_NONE
;
7080 unsigned char *pkblob
, *sigblob
, *sigdata
;
7081 int pkblob_len
, sigblob_len
, sigdata_len
;
7085 * We have loaded the private key and the server
7086 * has announced that it's willing to accept it.
7087 * Hallelujah. Generate a signature and send it.
7089 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
7090 ssh2_pkt_addstring(s
->pktout
, s
->username
);
7091 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
7092 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
7093 ssh2_pkt_addbool(s
->pktout
, TRUE
);
7094 ssh2_pkt_addstring(s
->pktout
, key
->alg
->name
);
7095 pkblob
= key
->alg
->public_blob(key
->data
, &pkblob_len
);
7096 ssh2_pkt_addstring_start(s
->pktout
);
7097 ssh2_pkt_addstring_data(s
->pktout
, (char *)pkblob
, pkblob_len
);
7100 * The data to be signed is:
7104 * followed by everything so far placed in the
7107 sigdata_len
= s
->pktout
->length
- 5 + 4 + 20;
7108 if (ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)
7110 sigdata
= snewn(sigdata_len
, unsigned char);
7112 if (!(ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)) {
7113 PUT_32BIT(sigdata
+p
, 20);
7116 memcpy(sigdata
+p
, ssh
->v2_session_id
, 20); p
+= 20;
7117 memcpy(sigdata
+p
, s
->pktout
->data
+ 5,
7118 s
->pktout
->length
- 5);
7119 p
+= s
->pktout
->length
- 5;
7120 assert(p
== sigdata_len
);
7121 sigblob
= key
->alg
->sign(key
->data
, (char *)sigdata
,
7122 sigdata_len
, &sigblob_len
);
7123 ssh2_add_sigblob(ssh
, s
->pktout
, pkblob
, pkblob_len
,
7124 sigblob
, sigblob_len
);
7129 ssh2_pkt_send(ssh
, s
->pktout
);
7130 s
->type
= AUTH_TYPE_PUBLICKEY
;
7131 key
->alg
->freekey(key
->data
);
7133 } else if (s
->method
== AUTH_PASSWORD
) {
7135 * We pad out the password packet to 256 bytes to make
7136 * it harder for an attacker to find the length of the
7139 * Anyone using a password longer than 256 bytes
7140 * probably doesn't have much to worry about from
7141 * people who find out how long their password is!
7143 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
7144 s
->pktout
->forcepad
= 256;
7145 ssh2_pkt_addstring(s
->pktout
, s
->username
);
7146 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
7147 ssh2_pkt_addstring(s
->pktout
, "password");
7148 ssh2_pkt_addbool(s
->pktout
, FALSE
);
7149 dont_log_password(ssh
, s
->pktout
, PKTLOG_BLANK
);
7150 ssh2_pkt_addstring(s
->pktout
, s
->password
);
7151 memset(s
->password
, 0, sizeof(s
->password
));
7152 end_log_omission(ssh
, s
->pktout
);
7153 ssh2_pkt_send(ssh
, s
->pktout
);
7154 logevent("Sent password");
7155 s
->type
= AUTH_TYPE_PASSWORD
;
7156 } else if (s
->method
== AUTH_KEYBOARD_INTERACTIVE
) {
7157 if (s
->curr_prompt
== 0) {
7158 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_INFO_RESPONSE
);
7159 s
->pktout
->forcepad
= 256;
7160 ssh2_pkt_adduint32(s
->pktout
, s
->num_prompts
);
7162 if (s
->need_pw
) { /* only add pw if we just got one! */
7163 dont_log_password(ssh
, s
->pktout
, PKTLOG_BLANK
);
7164 ssh2_pkt_addstring(s
->pktout
, s
->password
);
7165 memset(s
->password
, 0, sizeof(s
->password
));
7166 end_log_omission(ssh
, s
->pktout
);
7169 if (s
->curr_prompt
>= s
->num_prompts
) {
7170 ssh2_pkt_send(ssh
, s
->pktout
);
7173 * If there are prompts remaining, we set
7174 * `gotit' so that we won't attempt to get
7175 * another packet. Then we go back round the
7176 * loop and will end up retrieving another
7177 * prompt out of the existing packet. Funky or
7182 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
7184 c_write_str(ssh
, "No supported authentication methods"
7185 " left to try!\r\n");
7186 logevent("No supported authentications offered."
7188 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
7189 ssh2_pkt_adduint32(s
->pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
7190 ssh2_pkt_addstring(s
->pktout
, "No supported authentication"
7191 " methods available");
7192 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
7193 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
7194 ssh
->close_expected
= TRUE
;
7195 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
7199 } while (!s
->we_are_in
);
7202 * Now we're authenticated for the connection protocol. The
7203 * connection protocol will automatically have started at this
7204 * point; there's no need to send SERVICE_REQUEST.
7207 ssh
->channels
= newtree234(ssh_channelcmp
);
7210 * Set up handlers for some connection protocol messages, so we
7211 * don't have to handle them repeatedly in this coroutine.
7213 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_WINDOW_ADJUST
] =
7214 ssh2_msg_channel_window_adjust
;
7215 ssh
->packet_dispatch
[SSH2_MSG_GLOBAL_REQUEST
] =
7216 ssh2_msg_global_request
;
7219 * Create the main session channel.
7221 if (!ssh
->cfg
.ssh_no_shell
) {
7222 ssh
->mainchan
= snew(struct ssh_channel
);
7223 ssh
->mainchan
->ssh
= ssh
;
7224 ssh
->mainchan
->localid
= alloc_channel_id(ssh
);
7225 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
7226 ssh2_pkt_addstring(s
->pktout
, "session");
7227 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->localid
);
7228 ssh
->mainchan
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
7229 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->v
.v2
.locwindow
);/* our window size */
7230 ssh2_pkt_adduint32(s
->pktout
, OUR_V2_MAXPKT
); /* our max pkt size */
7231 ssh2_pkt_send(ssh
, s
->pktout
);
7232 crWaitUntilV(pktin
);
7233 if (pktin
->type
!= SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
7234 bombout(("Server refused to open a session"));
7236 /* FIXME: error data comes back in FAILURE packet */
7238 if (ssh_pkt_getuint32(pktin
) != ssh
->mainchan
->localid
) {
7239 bombout(("Server's channel confirmation cited wrong channel"));
7242 ssh
->mainchan
->remoteid
= ssh_pkt_getuint32(pktin
);
7243 ssh
->mainchan
->halfopen
= FALSE
;
7244 ssh
->mainchan
->type
= CHAN_MAINSESSION
;
7245 ssh
->mainchan
->closes
= 0;
7246 ssh
->mainchan
->v
.v2
.remwindow
= ssh_pkt_getuint32(pktin
);
7247 ssh
->mainchan
->v
.v2
.remmaxpkt
= ssh_pkt_getuint32(pktin
);
7248 bufchain_init(&ssh
->mainchan
->v
.v2
.outbuffer
);
7249 add234(ssh
->channels
, ssh
->mainchan
);
7250 update_specials_menu(ssh
->frontend
);
7251 logevent("Opened channel for session");
7253 ssh
->mainchan
= NULL
;
7256 * Now we have a channel, make dispatch table entries for
7257 * general channel-based messages.
7259 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_DATA
] =
7260 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EXTENDED_DATA
] =
7261 ssh2_msg_channel_data
;
7262 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EOF
] = ssh2_msg_channel_eof
;
7263 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_CLOSE
] = ssh2_msg_channel_close
;
7264 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
] =
7265 ssh2_msg_channel_open_confirmation
;
7266 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_FAILURE
] =
7267 ssh2_msg_channel_open_failure
;
7268 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_REQUEST
] =
7269 ssh2_msg_channel_request
;
7270 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN
] =
7271 ssh2_msg_channel_open
;
7274 * Potentially enable X11 forwarding.
7276 if (ssh
->mainchan
&& ssh
->cfg
.x11_forward
) {
7277 char proto
[20], data
[64];
7278 logevent("Requesting X11 forwarding");
7279 ssh
->x11auth
= x11_invent_auth(proto
, sizeof(proto
),
7280 data
, sizeof(data
), ssh
->cfg
.x11_auth
);
7281 x11_get_real_auth(ssh
->x11auth
, ssh
->cfg
.x11_display
);
7282 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7283 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
7284 ssh2_pkt_addstring(s
->pktout
, "x11-req");
7285 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7286 ssh2_pkt_addbool(s
->pktout
, 0); /* many connections */
7287 ssh2_pkt_addstring(s
->pktout
, proto
);
7288 ssh2_pkt_addstring(s
->pktout
, data
);
7289 ssh2_pkt_adduint32(s
->pktout
, x11_get_screen_number(ssh
->cfg
.x11_display
));
7290 ssh2_pkt_send(ssh
, s
->pktout
);
7292 crWaitUntilV(pktin
);
7294 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
7295 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
7296 bombout(("Unexpected response to X11 forwarding request:"
7297 " packet type %d", pktin
->type
));
7300 logevent("X11 forwarding refused");
7302 logevent("X11 forwarding enabled");
7303 ssh
->X11_fwd_enabled
= TRUE
;
7308 * Enable port forwardings.
7310 ssh_setup_portfwd(ssh
, &ssh
->cfg
);
7313 * Potentially enable agent forwarding.
7315 if (ssh
->mainchan
&& ssh
->cfg
.agentfwd
&& agent_exists()) {
7316 logevent("Requesting OpenSSH-style agent forwarding");
7317 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7318 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
7319 ssh2_pkt_addstring(s
->pktout
, "auth-agent-req@openssh.com");
7320 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7321 ssh2_pkt_send(ssh
, s
->pktout
);
7323 crWaitUntilV(pktin
);
7325 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
7326 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
7327 bombout(("Unexpected response to agent forwarding request:"
7328 " packet type %d", pktin
->type
));
7331 logevent("Agent forwarding refused");
7333 logevent("Agent forwarding enabled");
7334 ssh
->agentfwd_enabled
= TRUE
;
7339 * Now allocate a pty for the session.
7341 if (ssh
->mainchan
&& !ssh
->cfg
.nopty
) {
7342 /* Unpick the terminal-speed string. */
7343 /* XXX perhaps we should allow no speeds to be sent. */
7344 ssh
->ospeed
= 38400; ssh
->ispeed
= 38400; /* last-resort defaults */
7345 sscanf(ssh
->cfg
.termspeed
, "%d,%d", &ssh
->ospeed
, &ssh
->ispeed
);
7346 /* Build the pty request. */
7347 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7348 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
); /* recipient channel */
7349 ssh2_pkt_addstring(s
->pktout
, "pty-req");
7350 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7351 ssh2_pkt_addstring(s
->pktout
, ssh
->cfg
.termtype
);
7352 ssh2_pkt_adduint32(s
->pktout
, ssh
->term_width
);
7353 ssh2_pkt_adduint32(s
->pktout
, ssh
->term_height
);
7354 ssh2_pkt_adduint32(s
->pktout
, 0); /* pixel width */
7355 ssh2_pkt_adduint32(s
->pktout
, 0); /* pixel height */
7356 ssh2_pkt_addstring_start(s
->pktout
);
7357 parse_ttymodes(ssh
, ssh
->cfg
.ttymodes
,
7358 ssh2_send_ttymode
, (void *)s
->pktout
);
7359 ssh2_pkt_addbyte(s
->pktout
, SSH2_TTY_OP_ISPEED
);
7360 ssh2_pkt_adduint32(s
->pktout
, ssh
->ispeed
);
7361 ssh2_pkt_addbyte(s
->pktout
, SSH2_TTY_OP_OSPEED
);
7362 ssh2_pkt_adduint32(s
->pktout
, ssh
->ospeed
);
7363 ssh2_pkt_addstring_data(s
->pktout
, "\0", 1); /* TTY_OP_END */
7364 ssh2_pkt_send(ssh
, s
->pktout
);
7365 ssh
->state
= SSH_STATE_INTERMED
;
7367 crWaitUntilV(pktin
);
7369 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
7370 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
7371 bombout(("Unexpected response to pty request:"
7372 " packet type %d", pktin
->type
));
7375 c_write_str(ssh
, "Server refused to allocate pty\r\n");
7376 ssh
->editing
= ssh
->echoing
= 1;
7378 logeventf(ssh
, "Allocated pty (ospeed %dbps, ispeed %dbps)",
7379 ssh
->ospeed
, ssh
->ispeed
);
7382 ssh
->editing
= ssh
->echoing
= 1;
7386 * Send environment variables.
7388 * Simplest thing here is to send all the requests at once, and
7389 * then wait for a whole bunch of successes or failures.
7391 if (ssh
->mainchan
&& *ssh
->cfg
.environmt
) {
7392 char *e
= ssh
->cfg
.environmt
;
7393 char *var
, *varend
, *val
;
7399 while (*e
&& *e
!= '\t') e
++;
7401 if (*e
== '\t') e
++;
7406 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7407 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
7408 ssh2_pkt_addstring(s
->pktout
, "env");
7409 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7410 ssh2_pkt_addstring_start(s
->pktout
);
7411 ssh2_pkt_addstring_data(s
->pktout
, var
, varend
-var
);
7412 ssh2_pkt_addstring(s
->pktout
, val
);
7413 ssh2_pkt_send(ssh
, s
->pktout
);
7418 logeventf(ssh
, "Sent %d environment variables", s
->num_env
);
7421 s
->env_left
= s
->num_env
;
7423 while (s
->env_left
> 0) {
7424 crWaitUntilV(pktin
);
7426 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
7427 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
7428 bombout(("Unexpected response to environment request:"
7429 " packet type %d", pktin
->type
));
7439 if (s
->env_ok
== s
->num_env
) {
7440 logevent("All environment variables successfully set");
7441 } else if (s
->env_ok
== 0) {
7442 logevent("All environment variables refused");
7443 c_write_str(ssh
, "Server refused to set environment variables\r\n");
7445 logeventf(ssh
, "%d environment variables refused",
7446 s
->num_env
- s
->env_ok
);
7447 c_write_str(ssh
, "Server refused to set all environment variables\r\n");
7452 * Start a shell or a remote command. We may have to attempt
7453 * this twice if the config data has provided a second choice
7456 if (ssh
->mainchan
) while (1) {
7460 if (ssh
->fallback_cmd
) {
7461 subsys
= ssh
->cfg
.ssh_subsys2
;
7462 cmd
= ssh
->cfg
.remote_cmd_ptr2
;
7464 subsys
= ssh
->cfg
.ssh_subsys
;
7465 cmd
= ssh
->cfg
.remote_cmd_ptr
;
7466 if (!cmd
) cmd
= ssh
->cfg
.remote_cmd
;
7469 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7470 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
); /* recipient channel */
7472 ssh2_pkt_addstring(s
->pktout
, "subsystem");
7473 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7474 ssh2_pkt_addstring(s
->pktout
, cmd
);
7476 ssh2_pkt_addstring(s
->pktout
, "exec");
7477 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7478 ssh2_pkt_addstring(s
->pktout
, cmd
);
7480 ssh2_pkt_addstring(s
->pktout
, "shell");
7481 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7483 ssh2_pkt_send(ssh
, s
->pktout
);
7485 crWaitUntilV(pktin
);
7487 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
7488 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
7489 bombout(("Unexpected response to shell/command request:"
7490 " packet type %d", pktin
->type
));
7494 * We failed to start the command. If this is the
7495 * fallback command, we really are finished; if it's
7496 * not, and if the fallback command exists, try falling
7497 * back to it before complaining.
7499 if (!ssh
->fallback_cmd
&& ssh
->cfg
.remote_cmd_ptr2
!= NULL
) {
7500 logevent("Primary command failed; attempting fallback");
7501 ssh
->fallback_cmd
= TRUE
;
7504 bombout(("Server refused to start a shell/command"));
7507 logevent("Started a shell/command");
7512 ssh
->state
= SSH_STATE_SESSION
;
7513 if (ssh
->size_needed
)
7514 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
7515 if (ssh
->eof_needed
)
7516 ssh_special(ssh
, TS_EOF
);
7522 ldisc_send(ssh
->ldisc
, NULL
, 0, 0);/* cause ldisc to notice changes */
7527 s
->try_send
= FALSE
;
7531 * _All_ the connection-layer packets we expect to
7532 * receive are now handled by the dispatch table.
7533 * Anything that reaches here must be bogus.
7536 bombout(("Strange packet received: type %d", pktin
->type
));
7538 } else if (ssh
->mainchan
) {
7540 * We have spare data. Add it to the channel buffer.
7542 ssh2_add_channel_data(ssh
->mainchan
, (char *)in
, inlen
);
7547 struct ssh_channel
*c
;
7549 * Try to send data on all channels if we can.
7551 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++)
7552 ssh2_try_send_and_unthrottle(c
);
7560 * Handlers for SSH-2 messages that might arrive at any moment.
7562 static void ssh2_msg_disconnect(Ssh ssh
, struct Packet
*pktin
)
7564 /* log reason code in disconnect message */
7566 int nowlen
, reason
, msglen
;
7568 reason
= ssh_pkt_getuint32(pktin
);
7569 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
7571 if (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) {
7572 buf
= dupprintf("Received disconnect message (%s)",
7573 ssh2_disconnect_reasons
[reason
]);
7575 buf
= dupprintf("Received disconnect message (unknown"
7576 " type %d)", reason
);
7580 buf
= dupprintf("Disconnection message text: %n%.*s",
7581 &nowlen
, msglen
, msg
);
7583 bombout(("Server sent disconnect message\ntype %d (%s):\n\"%s\"",
7585 (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) ?
7586 ssh2_disconnect_reasons
[reason
] : "unknown",
7591 static void ssh2_msg_debug(Ssh ssh
, struct Packet
*pktin
)
7593 /* log the debug message */
7598 /* XXX maybe we should actually take notice of this */
7599 always_display
= ssh2_pkt_getbool(pktin
);
7600 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
7602 logeventf(ssh
, "Remote debug message: %.*s", msglen
, msg
);
7605 static void ssh2_msg_something_unimplemented(Ssh ssh
, struct Packet
*pktin
)
7607 struct Packet
*pktout
;
7608 pktout
= ssh2_pkt_init(SSH2_MSG_UNIMPLEMENTED
);
7609 ssh2_pkt_adduint32(pktout
, pktin
->sequence
);
7611 * UNIMPLEMENTED messages MUST appear in the same order as the
7612 * messages they respond to. Hence, never queue them.
7614 ssh2_pkt_send_noqueue(ssh
, pktout
);
7618 * Handle the top-level SSH-2 protocol.
7620 static void ssh2_protocol_setup(Ssh ssh
)
7625 * Most messages cause SSH2_MSG_UNIMPLEMENTED.
7627 for (i
= 0; i
< 256; i
++)
7628 ssh
->packet_dispatch
[i
] = ssh2_msg_something_unimplemented
;
7631 * Any message we actually understand, we set to NULL so that
7632 * the coroutines will get it.
7634 ssh
->packet_dispatch
[SSH2_MSG_UNIMPLEMENTED
] = NULL
;
7635 ssh
->packet_dispatch
[SSH2_MSG_SERVICE_REQUEST
] = NULL
;
7636 ssh
->packet_dispatch
[SSH2_MSG_SERVICE_ACCEPT
] = NULL
;
7637 ssh
->packet_dispatch
[SSH2_MSG_KEXINIT
] = NULL
;
7638 ssh
->packet_dispatch
[SSH2_MSG_NEWKEYS
] = NULL
;
7639 ssh
->packet_dispatch
[SSH2_MSG_KEXDH_INIT
] = NULL
;
7640 ssh
->packet_dispatch
[SSH2_MSG_KEXDH_REPLY
] = NULL
;
7641 /* ssh->packet_dispatch[SSH2_MSG_KEX_DH_GEX_REQUEST] = NULL; duplicate case value */
7642 /* ssh->packet_dispatch[SSH2_MSG_KEX_DH_GEX_GROUP] = NULL; duplicate case value */
7643 ssh
->packet_dispatch
[SSH2_MSG_KEX_DH_GEX_INIT
] = NULL
;
7644 ssh
->packet_dispatch
[SSH2_MSG_KEX_DH_GEX_REPLY
] = NULL
;
7645 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_REQUEST
] = NULL
;
7646 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_FAILURE
] = NULL
;
7647 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_SUCCESS
] = NULL
;
7648 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_BANNER
] = NULL
;
7649 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_PK_OK
] = NULL
;
7650 /* ssh->packet_dispatch[SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ] = NULL; duplicate case value */
7651 /* ssh->packet_dispatch[SSH2_MSG_USERAUTH_INFO_REQUEST] = NULL; duplicate case value */
7652 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_INFO_RESPONSE
] = NULL
;
7653 ssh
->packet_dispatch
[SSH2_MSG_GLOBAL_REQUEST
] = NULL
;
7654 ssh
->packet_dispatch
[SSH2_MSG_REQUEST_SUCCESS
] = NULL
;
7655 ssh
->packet_dispatch
[SSH2_MSG_REQUEST_FAILURE
] = NULL
;
7656 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN
] = NULL
;
7657 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
] = NULL
;
7658 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_FAILURE
] = NULL
;
7659 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_WINDOW_ADJUST
] = NULL
;
7660 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_DATA
] = NULL
;
7661 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EXTENDED_DATA
] = NULL
;
7662 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EOF
] = NULL
;
7663 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_CLOSE
] = NULL
;
7664 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_REQUEST
] = NULL
;
7665 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_SUCCESS
] = NULL
;
7666 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_FAILURE
] = NULL
;
7669 * These special message types we install handlers for.
7671 ssh
->packet_dispatch
[SSH2_MSG_DISCONNECT
] = ssh2_msg_disconnect
;
7672 ssh
->packet_dispatch
[SSH2_MSG_IGNORE
] = ssh_msg_ignore
; /* shared with SSH-1 */
7673 ssh
->packet_dispatch
[SSH2_MSG_DEBUG
] = ssh2_msg_debug
;
7676 static void ssh2_timer(void *ctx
, long now
)
7680 if (ssh
->state
== SSH_STATE_CLOSED
)
7683 if (!ssh
->kex_in_progress
&& ssh
->cfg
.ssh_rekey_time
!= 0 &&
7684 now
- ssh
->next_rekey
>= 0) {
7685 do_ssh2_transport(ssh
, "timeout", -1, NULL
);
7689 static void ssh2_protocol(Ssh ssh
, void *vin
, int inlen
,
7690 struct Packet
*pktin
)
7692 unsigned char *in
= (unsigned char *)vin
;
7693 if (ssh
->state
== SSH_STATE_CLOSED
)
7697 ssh
->incoming_data_size
+= pktin
->encrypted_len
;
7698 if (!ssh
->kex_in_progress
&&
7699 ssh
->max_data_size
!= 0 &&
7700 ssh
->incoming_data_size
> ssh
->max_data_size
)
7701 do_ssh2_transport(ssh
, "too much data received", -1, NULL
);
7704 if (pktin
&& ssh
->packet_dispatch
[pktin
->type
]) {
7705 ssh
->packet_dispatch
[pktin
->type
](ssh
, pktin
);
7709 if (!ssh
->protocol_initial_phase_done
||
7710 (pktin
&& pktin
->type
>= 20 && pktin
->type
< 50)) {
7711 if (do_ssh2_transport(ssh
, in
, inlen
, pktin
) &&
7712 !ssh
->protocol_initial_phase_done
) {
7713 ssh
->protocol_initial_phase_done
= TRUE
;
7715 * Allow authconn to initialise itself.
7717 do_ssh2_authconn(ssh
, NULL
, 0, NULL
);
7720 do_ssh2_authconn(ssh
, in
, inlen
, pktin
);
7725 * Called to set up the connection.
7727 * Returns an error message, or NULL on success.
7729 static const char *ssh_init(void *frontend_handle
, void **backend_handle
,
7731 char *host
, int port
, char **realhost
, int nodelay
,
7737 ssh
= snew(struct ssh_tag
);
7738 ssh
->cfg
= *cfg
; /* STRUCTURE COPY */
7739 ssh
->version
= 0; /* when not ready yet */
7742 ssh
->v1_cipher_ctx
= NULL
;
7743 ssh
->crcda_ctx
= NULL
;
7744 ssh
->cscipher
= NULL
;
7745 ssh
->cs_cipher_ctx
= NULL
;
7746 ssh
->sccipher
= NULL
;
7747 ssh
->sc_cipher_ctx
= NULL
;
7749 ssh
->cs_mac_ctx
= NULL
;
7751 ssh
->sc_mac_ctx
= NULL
;
7753 ssh
->cs_comp_ctx
= NULL
;
7755 ssh
->sc_comp_ctx
= NULL
;
7757 ssh
->kex_ctx
= NULL
;
7758 ssh
->hostkey
= NULL
;
7760 ssh
->close_expected
= FALSE
;
7761 ssh
->state
= SSH_STATE_PREPACKET
;
7762 ssh
->size_needed
= FALSE
;
7763 ssh
->eof_needed
= FALSE
;
7766 ssh
->deferred_send_data
= NULL
;
7767 ssh
->deferred_len
= 0;
7768 ssh
->deferred_size
= 0;
7769 ssh
->fallback_cmd
= 0;
7771 ssh
->x11auth
= NULL
;
7772 ssh
->v1_compressing
= FALSE
;
7773 ssh
->v2_outgoing_sequence
= 0;
7774 ssh
->ssh1_rdpkt_crstate
= 0;
7775 ssh
->ssh2_rdpkt_crstate
= 0;
7776 ssh
->do_ssh_init_crstate
= 0;
7777 ssh
->ssh_gotdata_crstate
= 0;
7778 ssh
->do_ssh1_connection_crstate
= 0;
7779 ssh
->do_ssh1_login_crstate
= 0;
7780 ssh
->do_ssh2_transport_crstate
= 0;
7781 ssh
->do_ssh2_authconn_crstate
= 0;
7782 ssh
->do_ssh_init_state
= NULL
;
7783 ssh
->do_ssh1_login_state
= NULL
;
7784 ssh
->do_ssh2_transport_state
= NULL
;
7785 ssh
->do_ssh2_authconn_state
= NULL
;
7786 ssh
->mainchan
= NULL
;
7787 ssh
->throttled_all
= 0;
7788 ssh
->v1_stdout_throttling
= 0;
7790 ssh
->queuelen
= ssh
->queuesize
= 0;
7791 ssh
->queueing
= FALSE
;
7792 ssh
->qhead
= ssh
->qtail
= NULL
;
7793 ssh
->deferred_rekey_reason
= NULL
;
7794 bufchain_init(&ssh
->queued_incoming_data
);
7795 ssh
->frozen
= FALSE
;
7797 *backend_handle
= ssh
;
7800 if (crypto_startup() == 0)
7801 return "Microsoft high encryption pack not installed!";
7804 ssh
->frontend
= frontend_handle
;
7805 ssh
->term_width
= ssh
->cfg
.width
;
7806 ssh
->term_height
= ssh
->cfg
.height
;
7808 ssh
->channels
= NULL
;
7809 ssh
->rportfwds
= NULL
;
7810 ssh
->portfwds
= NULL
;
7815 ssh
->v1_throttle_count
= 0;
7816 ssh
->overall_bufsize
= 0;
7817 ssh
->fallback_cmd
= 0;
7819 ssh
->protocol
= NULL
;
7821 ssh
->protocol_initial_phase_done
= FALSE
;
7825 ssh
->incoming_data_size
= ssh
->outgoing_data_size
=
7826 ssh
->deferred_data_size
= 0L;
7827 ssh
->max_data_size
= parse_blocksize(ssh
->cfg
.ssh_rekey_data
);
7828 ssh
->kex_in_progress
= FALSE
;
7830 p
= connect_to_host(ssh
, host
, port
, realhost
, nodelay
, keepalive
);
7839 static void ssh_free(void *handle
)
7841 Ssh ssh
= (Ssh
) handle
;
7842 struct ssh_channel
*c
;
7843 struct ssh_rportfwd
*pf
;
7845 if (ssh
->v1_cipher_ctx
)
7846 ssh
->cipher
->free_context(ssh
->v1_cipher_ctx
);
7847 if (ssh
->cs_cipher_ctx
)
7848 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
7849 if (ssh
->sc_cipher_ctx
)
7850 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
7851 if (ssh
->cs_mac_ctx
)
7852 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
7853 if (ssh
->sc_mac_ctx
)
7854 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
7855 if (ssh
->cs_comp_ctx
) {
7857 ssh
->cscomp
->compress_cleanup(ssh
->cs_comp_ctx
);
7859 zlib_compress_cleanup(ssh
->cs_comp_ctx
);
7861 if (ssh
->sc_comp_ctx
) {
7863 ssh
->sccomp
->decompress_cleanup(ssh
->sc_comp_ctx
);
7865 zlib_decompress_cleanup(ssh
->sc_comp_ctx
);
7868 dh_cleanup(ssh
->kex_ctx
);
7869 sfree(ssh
->savedhost
);
7871 while (ssh
->queuelen
-- > 0)
7872 ssh_free_packet(ssh
->queue
[ssh
->queuelen
]);
7875 while (ssh
->qhead
) {
7876 struct queued_handler
*qh
= ssh
->qhead
;
7877 ssh
->qhead
= qh
->next
;
7880 ssh
->qhead
= ssh
->qtail
= NULL
;
7882 if (ssh
->channels
) {
7883 while ((c
= delpos234(ssh
->channels
, 0)) != NULL
) {
7886 if (c
->u
.x11
.s
!= NULL
)
7887 x11_close(c
->u
.x11
.s
);
7890 if (c
->u
.pfd
.s
!= NULL
)
7891 pfd_close(c
->u
.pfd
.s
);
7896 freetree234(ssh
->channels
);
7897 ssh
->channels
= NULL
;
7900 if (ssh
->rportfwds
) {
7901 while ((pf
= delpos234(ssh
->rportfwds
, 0)) != NULL
)
7903 freetree234(ssh
->rportfwds
);
7904 ssh
->rportfwds
= NULL
;
7906 sfree(ssh
->deferred_send_data
);
7908 x11_free_auth(ssh
->x11auth
);
7909 sfree(ssh
->do_ssh_init_state
);
7910 sfree(ssh
->do_ssh1_login_state
);
7911 sfree(ssh
->do_ssh2_transport_state
);
7912 sfree(ssh
->do_ssh2_authconn_state
);
7913 if (ssh
->crcda_ctx
) {
7914 crcda_free_context(ssh
->crcda_ctx
);
7915 ssh
->crcda_ctx
= NULL
;
7918 ssh_do_close(ssh
, TRUE
);
7919 expire_timer_context(ssh
);
7921 pinger_free(ssh
->pinger
);
7922 bufchain_clear(&ssh
->queued_incoming_data
);
7929 * Reconfigure the SSH backend.
7931 static void ssh_reconfig(void *handle
, Config
*cfg
)
7933 Ssh ssh
= (Ssh
) handle
;
7934 char *rekeying
= NULL
, rekey_mandatory
= FALSE
;
7935 unsigned long old_max_data_size
;
7937 pinger_reconfig(ssh
->pinger
, &ssh
->cfg
, cfg
);
7938 ssh_setup_portfwd(ssh
, cfg
);
7940 if (ssh
->cfg
.ssh_rekey_time
!= cfg
->ssh_rekey_time
&&
7941 cfg
->ssh_rekey_time
!= 0) {
7942 long new_next
= ssh
->last_rekey
+ cfg
->ssh_rekey_time
*60*TICKSPERSEC
;
7943 long now
= GETTICKCOUNT();
7945 if (new_next
- now
< 0) {
7946 rekeying
= "timeout shortened";
7948 ssh
->next_rekey
= schedule_timer(new_next
- now
, ssh2_timer
, ssh
);
7952 old_max_data_size
= ssh
->max_data_size
;
7953 ssh
->max_data_size
= parse_blocksize(cfg
->ssh_rekey_data
);
7954 if (old_max_data_size
!= ssh
->max_data_size
&&
7955 ssh
->max_data_size
!= 0) {
7956 if (ssh
->outgoing_data_size
> ssh
->max_data_size
||
7957 ssh
->incoming_data_size
> ssh
->max_data_size
)
7958 rekeying
= "data limit lowered";
7961 if (ssh
->cfg
.compression
!= cfg
->compression
) {
7962 rekeying
= "compression setting changed";
7963 rekey_mandatory
= TRUE
;
7966 if (ssh
->cfg
.ssh2_des_cbc
!= cfg
->ssh2_des_cbc
||
7967 memcmp(ssh
->cfg
.ssh_cipherlist
, cfg
->ssh_cipherlist
,
7968 sizeof(ssh
->cfg
.ssh_cipherlist
))) {
7969 rekeying
= "cipher settings changed";
7970 rekey_mandatory
= TRUE
;
7973 ssh
->cfg
= *cfg
; /* STRUCTURE COPY */
7976 if (!ssh
->kex_in_progress
) {
7977 do_ssh2_transport(ssh
, rekeying
, -1, NULL
);
7978 } else if (rekey_mandatory
) {
7979 ssh
->deferred_rekey_reason
= rekeying
;
7985 * Called to send data down the Telnet connection.
7987 static int ssh_send(void *handle
, char *buf
, int len
)
7989 Ssh ssh
= (Ssh
) handle
;
7991 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
7994 ssh
->protocol(ssh
, (unsigned char *)buf
, len
, 0);
7996 return ssh_sendbuffer(ssh
);
8000 * Called to query the current amount of buffered stdin data.
8002 static int ssh_sendbuffer(void *handle
)
8004 Ssh ssh
= (Ssh
) handle
;
8007 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
8011 * If the SSH socket itself has backed up, add the total backup
8012 * size on that to any individual buffer on the stdin channel.
8015 if (ssh
->throttled_all
)
8016 override_value
= ssh
->overall_bufsize
;
8018 if (ssh
->version
== 1) {
8019 return override_value
;
8020 } else if (ssh
->version
== 2) {
8021 if (!ssh
->mainchan
|| ssh
->mainchan
->closes
> 0)
8022 return override_value
;
8024 return (override_value
+
8025 bufchain_size(&ssh
->mainchan
->v
.v2
.outbuffer
));
8032 * Called to set the size of the window from SSH's POV.
8034 static void ssh_size(void *handle
, int width
, int height
)
8036 Ssh ssh
= (Ssh
) handle
;
8037 struct Packet
*pktout
;
8039 ssh
->term_width
= width
;
8040 ssh
->term_height
= height
;
8042 switch (ssh
->state
) {
8043 case SSH_STATE_BEFORE_SIZE
:
8044 case SSH_STATE_PREPACKET
:
8045 case SSH_STATE_CLOSED
:
8046 break; /* do nothing */
8047 case SSH_STATE_INTERMED
:
8048 ssh
->size_needed
= TRUE
; /* buffer for later */
8050 case SSH_STATE_SESSION
:
8051 if (!ssh
->cfg
.nopty
) {
8052 if (ssh
->version
== 1) {
8053 send_packet(ssh
, SSH1_CMSG_WINDOW_SIZE
,
8054 PKT_INT
, ssh
->term_height
,
8055 PKT_INT
, ssh
->term_width
,
8056 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
8057 } else if (ssh
->mainchan
) {
8058 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
8059 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
8060 ssh2_pkt_addstring(pktout
, "window-change");
8061 ssh2_pkt_addbool(pktout
, 0);
8062 ssh2_pkt_adduint32(pktout
, ssh
->term_width
);
8063 ssh2_pkt_adduint32(pktout
, ssh
->term_height
);
8064 ssh2_pkt_adduint32(pktout
, 0);
8065 ssh2_pkt_adduint32(pktout
, 0);
8066 ssh2_pkt_send(ssh
, pktout
);
8074 * Return a list of the special codes that make sense in this
8077 static const struct telnet_special
*ssh_get_specials(void *handle
)
8079 static const struct telnet_special ssh1_ignore_special
[] = {
8080 {"IGNORE message", TS_NOP
}
8082 static const struct telnet_special ssh2_transport_specials
[] = {
8083 {"IGNORE message", TS_NOP
},
8084 {"Repeat key exchange", TS_REKEY
},
8086 static const struct telnet_special ssh2_session_specials
[] = {
8089 /* These are the signal names defined by draft-ietf-secsh-connect-23.
8090 * They include all the ISO C signals, but are a subset of the POSIX
8091 * required signals. */
8092 {"SIGINT (Interrupt)", TS_SIGINT
},
8093 {"SIGTERM (Terminate)", TS_SIGTERM
},
8094 {"SIGKILL (Kill)", TS_SIGKILL
},
8095 {"SIGQUIT (Quit)", TS_SIGQUIT
},
8096 {"SIGHUP (Hangup)", TS_SIGHUP
},
8097 {"More signals", TS_SUBMENU
},
8098 {"SIGABRT", TS_SIGABRT
}, {"SIGALRM", TS_SIGALRM
},
8099 {"SIGFPE", TS_SIGFPE
}, {"SIGILL", TS_SIGILL
},
8100 {"SIGPIPE", TS_SIGPIPE
}, {"SIGSEGV", TS_SIGSEGV
},
8101 {"SIGUSR1", TS_SIGUSR1
}, {"SIGUSR2", TS_SIGUSR2
},
8104 static const struct telnet_special specials_end
[] = {
8107 /* XXX review this length for any changes: */
8108 static struct telnet_special ssh_specials
[lenof(ssh2_transport_specials
) +
8109 lenof(ssh2_session_specials
) +
8110 lenof(specials_end
)];
8111 Ssh ssh
= (Ssh
) handle
;
8113 #define ADD_SPECIALS(name) \
8115 assert((i + lenof(name)) <= lenof(ssh_specials)); \
8116 memcpy(&ssh_specials[i], name, sizeof name); \
8120 if (ssh
->version
== 1) {
8121 /* Don't bother offering IGNORE if we've decided the remote
8122 * won't cope with it, since we wouldn't bother sending it if
8124 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
))
8125 ADD_SPECIALS(ssh1_ignore_special
);
8126 } else if (ssh
->version
== 2) {
8127 ADD_SPECIALS(ssh2_transport_specials
);
8129 ADD_SPECIALS(ssh2_session_specials
);
8130 } /* else we're not ready yet */
8133 ADD_SPECIALS(specials_end
);
8134 return ssh_specials
;
8142 * Send Telnet special codes. TS_EOF is useful for `plink', so you
8143 * can send an EOF and collect resulting output (e.g. `plink
8146 static void ssh_special(void *handle
, Telnet_Special code
)
8148 Ssh ssh
= (Ssh
) handle
;
8149 struct Packet
*pktout
;
8151 if (code
== TS_EOF
) {
8152 if (ssh
->state
!= SSH_STATE_SESSION
) {
8154 * Buffer the EOF in case we are pre-SESSION, so we can
8155 * send it as soon as we reach SESSION.
8158 ssh
->eof_needed
= TRUE
;
8161 if (ssh
->version
== 1) {
8162 send_packet(ssh
, SSH1_CMSG_EOF
, PKT_END
);
8163 } else if (ssh
->mainchan
) {
8164 struct Packet
*pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF
);
8165 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
8166 ssh2_pkt_send(ssh
, pktout
);
8167 ssh
->send_ok
= 0; /* now stop trying to read from stdin */
8169 logevent("Sent EOF message");
8170 } else if (code
== TS_PING
|| code
== TS_NOP
) {
8171 if (ssh
->state
== SSH_STATE_CLOSED
8172 || ssh
->state
== SSH_STATE_PREPACKET
) return;
8173 if (ssh
->version
== 1) {
8174 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
))
8175 send_packet(ssh
, SSH1_MSG_IGNORE
, PKT_STR
, "", PKT_END
);
8177 pktout
= ssh2_pkt_init(SSH2_MSG_IGNORE
);
8178 ssh2_pkt_addstring_start(pktout
);
8179 ssh2_pkt_send_noqueue(ssh
, pktout
);
8181 } else if (code
== TS_REKEY
) {
8182 if (!ssh
->kex_in_progress
&& ssh
->version
== 2) {
8183 do_ssh2_transport(ssh
, "at user request", -1, NULL
);
8185 } else if (code
== TS_BRK
) {
8186 if (ssh
->state
== SSH_STATE_CLOSED
8187 || ssh
->state
== SSH_STATE_PREPACKET
) return;
8188 if (ssh
->version
== 1) {
8189 logevent("Unable to send BREAK signal in SSH-1");
8190 } else if (ssh
->mainchan
) {
8191 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
8192 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
8193 ssh2_pkt_addstring(pktout
, "break");
8194 ssh2_pkt_addbool(pktout
, 0);
8195 ssh2_pkt_adduint32(pktout
, 0); /* default break length */
8196 ssh2_pkt_send(ssh
, pktout
);
8199 /* Is is a POSIX signal? */
8200 char *signame
= NULL
;
8201 if (code
== TS_SIGABRT
) signame
= "ABRT";
8202 if (code
== TS_SIGALRM
) signame
= "ALRM";
8203 if (code
== TS_SIGFPE
) signame
= "FPE";
8204 if (code
== TS_SIGHUP
) signame
= "HUP";
8205 if (code
== TS_SIGILL
) signame
= "ILL";
8206 if (code
== TS_SIGINT
) signame
= "INT";
8207 if (code
== TS_SIGKILL
) signame
= "KILL";
8208 if (code
== TS_SIGPIPE
) signame
= "PIPE";
8209 if (code
== TS_SIGQUIT
) signame
= "QUIT";
8210 if (code
== TS_SIGSEGV
) signame
= "SEGV";
8211 if (code
== TS_SIGTERM
) signame
= "TERM";
8212 if (code
== TS_SIGUSR1
) signame
= "USR1";
8213 if (code
== TS_SIGUSR2
) signame
= "USR2";
8214 /* The SSH-2 protocol does in principle support arbitrary named
8215 * signals, including signame@domain, but we don't support those. */
8217 /* It's a signal. */
8218 if (ssh
->version
== 2 && ssh
->mainchan
) {
8219 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
8220 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
8221 ssh2_pkt_addstring(pktout
, "signal");
8222 ssh2_pkt_addbool(pktout
, 0);
8223 ssh2_pkt_addstring(pktout
, signame
);
8224 ssh2_pkt_send(ssh
, pktout
);
8225 logeventf(ssh
, "Sent signal SIG%s", signame
);
8228 /* Never heard of it. Do nothing */
8233 void *new_sock_channel(void *handle
, Socket s
)
8235 Ssh ssh
= (Ssh
) handle
;
8236 struct ssh_channel
*c
;
8237 c
= snew(struct ssh_channel
);
8242 c
->localid
= alloc_channel_id(ssh
);
8244 c
->type
= CHAN_SOCKDATA_DORMANT
;/* identify channel type */
8246 bufchain_init(&c
->v
.v2
.outbuffer
);
8247 add234(ssh
->channels
, c
);
8253 * This is called when stdout/stderr (the entity to which
8254 * from_backend sends data) manages to clear some backlog.
8256 static void ssh_unthrottle(void *handle
, int bufsize
)
8258 Ssh ssh
= (Ssh
) handle
;
8259 if (ssh
->version
== 1) {
8260 if (ssh
->v1_stdout_throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
8261 ssh
->v1_stdout_throttling
= 0;
8262 ssh1_throttle(ssh
, -1);
8265 if (ssh
->mainchan
&& ssh
->mainchan
->closes
== 0)
8266 ssh2_set_window(ssh
->mainchan
, OUR_V2_WINSIZE
- bufsize
);
8270 void ssh_send_port_open(void *channel
, char *hostname
, int port
, char *org
)
8272 struct ssh_channel
*c
= (struct ssh_channel
*)channel
;
8274 struct Packet
*pktout
;
8276 logeventf(ssh
, "Opening forwarded connection to %s:%d", hostname
, port
);
8278 if (ssh
->version
== 1) {
8279 send_packet(ssh
, SSH1_MSG_PORT_OPEN
,
8280 PKT_INT
, c
->localid
,
8283 /* PKT_STR, <org:orgport>, */
8286 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
8287 ssh2_pkt_addstring(pktout
, "direct-tcpip");
8288 ssh2_pkt_adduint32(pktout
, c
->localid
);
8289 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
8290 ssh2_pkt_adduint32(pktout
, c
->v
.v2
.locwindow
);/* our window size */
8291 ssh2_pkt_adduint32(pktout
, OUR_V2_MAXPKT
); /* our max pkt size */
8292 ssh2_pkt_addstring(pktout
, hostname
);
8293 ssh2_pkt_adduint32(pktout
, port
);
8295 * We make up values for the originator data; partly it's
8296 * too much hassle to keep track, and partly I'm not
8297 * convinced the server should be told details like that
8298 * about my local network configuration.
8300 ssh2_pkt_addstring(pktout
, "client-side-connection");
8301 ssh2_pkt_adduint32(pktout
, 0);
8302 ssh2_pkt_send(ssh
, pktout
);
8306 static Socket
ssh_socket(void *handle
)
8308 Ssh ssh
= (Ssh
) handle
;
8312 static int ssh_sendok(void *handle
)
8314 Ssh ssh
= (Ssh
) handle
;
8315 return ssh
->send_ok
;
8318 static int ssh_ldisc(void *handle
, int option
)
8320 Ssh ssh
= (Ssh
) handle
;
8321 if (option
== LD_ECHO
)
8322 return ssh
->echoing
;
8323 if (option
== LD_EDIT
)
8324 return ssh
->editing
;
8328 static void ssh_provide_ldisc(void *handle
, void *ldisc
)
8330 Ssh ssh
= (Ssh
) handle
;
8334 static void ssh_provide_logctx(void *handle
, void *logctx
)
8336 Ssh ssh
= (Ssh
) handle
;
8337 ssh
->logctx
= logctx
;
8340 static int ssh_return_exitcode(void *handle
)
8342 Ssh ssh
= (Ssh
) handle
;
8346 return (ssh
->exitcode
>= 0 ? ssh
->exitcode
: 0);
8350 * cfg_info for SSH is the currently running version of the
8351 * protocol. (1 for 1; 2 for 2; 0 for not-decided-yet.)
8353 static int ssh_cfg_info(void *handle
)
8355 Ssh ssh
= (Ssh
) handle
;
8356 return ssh
->version
;
8360 * Gross hack: pscp will try to start SFTP but fall back to scp1 if
8361 * that fails. This variable is the means by which scp.c can reach
8362 * into the SSH code and find out which one it got.
8364 extern int ssh_fallback_cmd(void *handle
)
8366 Ssh ssh
= (Ssh
) handle
;
8367 return ssh
->fallback_cmd
;
8370 Backend ssh_backend
= {
8380 ssh_return_exitcode
,