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
169 #define translate(x) if (type == x) return #x
170 #define translatec(x,ctx) if (type == x && (pkt_ctx & ctx)) return #x
171 static char *ssh1_pkt_type(int type
)
173 translate(SSH1_MSG_DISCONNECT
);
174 translate(SSH1_SMSG_PUBLIC_KEY
);
175 translate(SSH1_CMSG_SESSION_KEY
);
176 translate(SSH1_CMSG_USER
);
177 translate(SSH1_CMSG_AUTH_RSA
);
178 translate(SSH1_SMSG_AUTH_RSA_CHALLENGE
);
179 translate(SSH1_CMSG_AUTH_RSA_RESPONSE
);
180 translate(SSH1_CMSG_AUTH_PASSWORD
);
181 translate(SSH1_CMSG_REQUEST_PTY
);
182 translate(SSH1_CMSG_WINDOW_SIZE
);
183 translate(SSH1_CMSG_EXEC_SHELL
);
184 translate(SSH1_CMSG_EXEC_CMD
);
185 translate(SSH1_SMSG_SUCCESS
);
186 translate(SSH1_SMSG_FAILURE
);
187 translate(SSH1_CMSG_STDIN_DATA
);
188 translate(SSH1_SMSG_STDOUT_DATA
);
189 translate(SSH1_SMSG_STDERR_DATA
);
190 translate(SSH1_CMSG_EOF
);
191 translate(SSH1_SMSG_EXIT_STATUS
);
192 translate(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
);
193 translate(SSH1_MSG_CHANNEL_OPEN_FAILURE
);
194 translate(SSH1_MSG_CHANNEL_DATA
);
195 translate(SSH1_MSG_CHANNEL_CLOSE
);
196 translate(SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
);
197 translate(SSH1_SMSG_X11_OPEN
);
198 translate(SSH1_CMSG_PORT_FORWARD_REQUEST
);
199 translate(SSH1_MSG_PORT_OPEN
);
200 translate(SSH1_CMSG_AGENT_REQUEST_FORWARDING
);
201 translate(SSH1_SMSG_AGENT_OPEN
);
202 translate(SSH1_MSG_IGNORE
);
203 translate(SSH1_CMSG_EXIT_CONFIRMATION
);
204 translate(SSH1_CMSG_X11_REQUEST_FORWARDING
);
205 translate(SSH1_CMSG_AUTH_RHOSTS_RSA
);
206 translate(SSH1_MSG_DEBUG
);
207 translate(SSH1_CMSG_REQUEST_COMPRESSION
);
208 translate(SSH1_CMSG_AUTH_TIS
);
209 translate(SSH1_SMSG_AUTH_TIS_CHALLENGE
);
210 translate(SSH1_CMSG_AUTH_TIS_RESPONSE
);
211 translate(SSH1_CMSG_AUTH_CCARD
);
212 translate(SSH1_SMSG_AUTH_CCARD_CHALLENGE
);
213 translate(SSH1_CMSG_AUTH_CCARD_RESPONSE
);
216 static char *ssh2_pkt_type(int pkt_ctx
, int type
)
218 translate(SSH2_MSG_DISCONNECT
);
219 translate(SSH2_MSG_IGNORE
);
220 translate(SSH2_MSG_UNIMPLEMENTED
);
221 translate(SSH2_MSG_DEBUG
);
222 translate(SSH2_MSG_SERVICE_REQUEST
);
223 translate(SSH2_MSG_SERVICE_ACCEPT
);
224 translate(SSH2_MSG_KEXINIT
);
225 translate(SSH2_MSG_NEWKEYS
);
226 translatec(SSH2_MSG_KEXDH_INIT
, SSH2_PKTCTX_DHGROUP
);
227 translatec(SSH2_MSG_KEXDH_REPLY
, SSH2_PKTCTX_DHGROUP
);
228 translatec(SSH2_MSG_KEX_DH_GEX_REQUEST
, SSH2_PKTCTX_DHGEX
);
229 translatec(SSH2_MSG_KEX_DH_GEX_GROUP
, SSH2_PKTCTX_DHGEX
);
230 translatec(SSH2_MSG_KEX_DH_GEX_INIT
, SSH2_PKTCTX_DHGEX
);
231 translatec(SSH2_MSG_KEX_DH_GEX_REPLY
, SSH2_PKTCTX_DHGEX
);
232 translate(SSH2_MSG_USERAUTH_REQUEST
);
233 translate(SSH2_MSG_USERAUTH_FAILURE
);
234 translate(SSH2_MSG_USERAUTH_SUCCESS
);
235 translate(SSH2_MSG_USERAUTH_BANNER
);
236 translatec(SSH2_MSG_USERAUTH_PK_OK
, SSH2_PKTCTX_PUBLICKEY
);
237 translatec(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ
, SSH2_PKTCTX_PASSWORD
);
238 translatec(SSH2_MSG_USERAUTH_INFO_REQUEST
, SSH2_PKTCTX_KBDINTER
);
239 translatec(SSH2_MSG_USERAUTH_INFO_RESPONSE
, SSH2_PKTCTX_KBDINTER
);
240 translate(SSH2_MSG_GLOBAL_REQUEST
);
241 translate(SSH2_MSG_REQUEST_SUCCESS
);
242 translate(SSH2_MSG_REQUEST_FAILURE
);
243 translate(SSH2_MSG_CHANNEL_OPEN
);
244 translate(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
);
245 translate(SSH2_MSG_CHANNEL_OPEN_FAILURE
);
246 translate(SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
247 translate(SSH2_MSG_CHANNEL_DATA
);
248 translate(SSH2_MSG_CHANNEL_EXTENDED_DATA
);
249 translate(SSH2_MSG_CHANNEL_EOF
);
250 translate(SSH2_MSG_CHANNEL_CLOSE
);
251 translate(SSH2_MSG_CHANNEL_REQUEST
);
252 translate(SSH2_MSG_CHANNEL_SUCCESS
);
253 translate(SSH2_MSG_CHANNEL_FAILURE
);
259 #define GET_32BIT(cp) \
260 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
261 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
262 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
263 ((unsigned long)(unsigned char)(cp)[3]))
265 #define PUT_32BIT(cp, value) { \
266 (cp)[0] = (unsigned char)((value) >> 24); \
267 (cp)[1] = (unsigned char)((value) >> 16); \
268 (cp)[2] = (unsigned char)((value) >> 8); \
269 (cp)[3] = (unsigned char)(value); }
271 /* Enumeration values for fields in SSH-1 packets */
273 PKT_END
, PKT_INT
, PKT_CHAR
, PKT_DATA
, PKT_STR
, PKT_BIGNUM
,
274 /* These values are for communicating relevant semantics of
275 * fields to the packet logging code. */
276 PKTT_OTHER
, PKTT_PASSWORD
, PKTT_DATA
280 * Coroutine mechanics for the sillier bits of the code. If these
281 * macros look impenetrable to you, you might find it helpful to
284 * http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
286 * which explains the theory behind these macros.
288 * In particular, if you are getting `case expression not constant'
289 * errors when building with MS Visual Studio, this is because MS's
290 * Edit and Continue debugging feature causes their compiler to
291 * violate ANSI C. To disable Edit and Continue debugging:
293 * - right-click ssh.c in the FileView
295 * - select the C/C++ tab and the General category
296 * - under `Debug info:', select anything _other_ than `Program
297 * Database for Edit and Continue'.
299 #define crBegin(v) { int *crLine = &v; switch(v) { case 0:;
302 if (!ssh->t) ssh->t = snew(struct t); \
304 #define crFinish(z) } *crLine = 0; return (z); }
305 #define crFinishV } *crLine = 0; return; }
306 #define crReturn(z) \
308 *crLine =__LINE__; return (z); case __LINE__:;\
312 *crLine=__LINE__; return; case __LINE__:;\
314 #define crStop(z) do{ *crLine = 0; return (z); }while(0)
315 #define crStopV do{ *crLine = 0; return; }while(0)
316 #define crWaitUntil(c) do { crReturn(0); } while (!(c))
317 #define crWaitUntilV(c) do { crReturnV; } while (!(c))
319 typedef struct ssh_tag
*Ssh
;
322 static struct Packet
*ssh2_pkt_init(int pkt_type
);
323 static void ssh2_pkt_addbool(struct Packet
*, unsigned char value
);
324 static void ssh2_pkt_adduint32(struct Packet
*, unsigned long value
);
325 static void ssh2_pkt_addstring_start(struct Packet
*);
326 static void ssh2_pkt_addstring_str(struct Packet
*, char *data
);
327 static void ssh2_pkt_addstring_data(struct Packet
*, char *data
, int len
);
328 static void ssh2_pkt_addstring(struct Packet
*, char *data
);
329 static unsigned char *ssh2_mpint_fmt(Bignum b
, int *len
);
330 static void ssh2_pkt_addmp(struct Packet
*, Bignum b
);
331 static int ssh2_pkt_construct(Ssh
, struct Packet
*);
332 static void ssh2_pkt_send(Ssh
, struct Packet
*);
333 static void ssh2_pkt_send_noqueue(Ssh
, struct Packet
*);
334 static int do_ssh1_login(Ssh ssh
, unsigned char *in
, int inlen
,
335 struct Packet
*pktin
);
336 static void do_ssh2_authconn(Ssh ssh
, unsigned char *in
, int inlen
,
337 struct Packet
*pktin
);
340 * Buffer management constants. There are several of these for
341 * various different purposes:
343 * - SSH1_BUFFER_LIMIT is the amount of backlog that must build up
344 * on a local data stream before we throttle the whole SSH
345 * connection (in SSH1 only). Throttling the whole connection is
346 * pretty drastic so we set this high in the hope it won't
349 * - SSH_MAX_BACKLOG is the amount of backlog that must build up
350 * on the SSH connection itself before we defensively throttle
351 * _all_ local data streams. This is pretty drastic too (though
352 * thankfully unlikely in SSH2 since the window mechanism should
353 * ensure that the server never has any need to throttle its end
354 * of the connection), so we set this high as well.
356 * - OUR_V2_WINSIZE is the maximum window size we present on SSH2
360 #define SSH1_BUFFER_LIMIT 32768
361 #define SSH_MAX_BACKLOG 32768
362 #define OUR_V2_WINSIZE 16384
363 #define OUR_V2_MAXPKT 0x4000UL
365 const static struct ssh_signkey
*hostkey_algs
[] = { &ssh_rsa
, &ssh_dss
};
367 static void *nullmac_make_context(void)
371 static void nullmac_free_context(void *handle
)
374 static void nullmac_key(void *handle
, unsigned char *key
)
377 static void nullmac_generate(void *handle
, unsigned char *blk
, int len
,
381 static int nullmac_verify(void *handle
, unsigned char *blk
, int len
,
386 const static struct ssh_mac ssh_mac_none
= {
387 nullmac_make_context
, nullmac_free_context
, nullmac_key
,
388 nullmac_generate
, nullmac_verify
, "none", 0
390 const static struct ssh_mac
*macs
[] = {
391 &ssh_sha1
, &ssh_md5
, &ssh_mac_none
393 const static struct ssh_mac
*buggymacs
[] = {
394 &ssh_sha1_buggy
, &ssh_md5
, &ssh_mac_none
397 static void *ssh_comp_none_init(void)
401 static void ssh_comp_none_cleanup(void *handle
)
404 static int ssh_comp_none_block(void *handle
, unsigned char *block
, int len
,
405 unsigned char **outblock
, int *outlen
)
409 static int ssh_comp_none_disable(void *handle
)
413 const static struct ssh_compress ssh_comp_none
= {
415 ssh_comp_none_init
, ssh_comp_none_cleanup
, ssh_comp_none_block
,
416 ssh_comp_none_init
, ssh_comp_none_cleanup
, ssh_comp_none_block
,
417 ssh_comp_none_disable
, NULL
419 extern const struct ssh_compress ssh_zlib
;
420 const static struct ssh_compress
*compressions
[] = {
421 &ssh_zlib
, &ssh_comp_none
424 enum { /* channel types */
429 CHAN_SOCKDATA_DORMANT
/* one the remote hasn't confirmed */
433 * 2-3-4 tree storing channels.
436 Ssh ssh
; /* pointer back to main context */
437 unsigned remoteid
, localid
;
439 /* True if we opened this channel but server hasn't confirmed. */
442 * In SSH1, this value contains four bits:
444 * 1 We have sent SSH1_MSG_CHANNEL_CLOSE.
445 * 2 We have sent SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION.
446 * 4 We have received SSH1_MSG_CHANNEL_CLOSE.
447 * 8 We have received SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION.
449 * A channel is completely finished with when all four bits are set.
453 struct ssh1_data_channel
{
456 struct ssh2_data_channel
{
458 unsigned remwindow
, remmaxpkt
;
463 struct ssh_agent_channel
{
464 unsigned char *message
;
465 unsigned char msglen
[4];
466 unsigned lensofar
, totallen
;
468 struct ssh_x11_channel
{
471 struct ssh_pfd_channel
{
478 * 2-3-4 tree storing remote->local port forwardings. SSH 1 and SSH
479 * 2 use this structure in different ways, reflecting SSH 2's
480 * altogether saner approach to port forwarding.
482 * In SSH 1, you arrange a remote forwarding by sending the server
483 * the remote port number, and the local destination host:port.
484 * When a connection comes in, the server sends you back that
485 * host:port pair, and you connect to it. This is a ready-made
486 * security hole if you're not on the ball: a malicious server
487 * could send you back _any_ host:port pair, so if you trustingly
488 * connect to the address it gives you then you've just opened the
489 * entire inside of your corporate network just by connecting
490 * through it to a dodgy SSH server. Hence, we must store a list of
491 * host:port pairs we _are_ trying to forward to, and reject a
492 * connection request from the server if it's not in the list.
494 * In SSH 2, each side of the connection minds its own business and
495 * doesn't send unnecessary information to the other. You arrange a
496 * remote forwarding by sending the server just the remote port
497 * number. When a connection comes in, the server tells you which
498 * of its ports was connected to; and _you_ have to remember what
499 * local host:port pair went with that port number.
501 * Hence, in SSH 1 this structure is indexed by destination
502 * host:port pair, whereas in SSH 2 it is indexed by source port.
504 struct ssh_portfwd
; /* forward declaration */
506 struct ssh_rportfwd
{
507 unsigned sport
, dport
;
510 struct ssh_portfwd
*pfrec
;
512 #define free_rportfwd(pf) ( \
513 ((pf) ? (sfree((pf)->sportdesc)) : (void)0 ), sfree(pf) )
516 * Separately to the rportfwd tree (which is for looking up port
517 * open requests from the server), a tree of _these_ structures is
518 * used to keep track of all the currently open port forwardings,
519 * so that we can reconfigure in mid-session if the user requests
523 enum { DESTROY
, KEEP
, CREATE
} status
;
525 unsigned sport
, dport
;
528 struct ssh_rportfwd
*remote
;
532 #define free_portfwd(pf) ( \
533 ((pf) ? (sfree((pf)->saddr), sfree((pf)->daddr), \
534 sfree((pf)->sserv), sfree((pf)->dserv)) : (void)0 ), sfree(pf) )
538 long forcepad
; /* Force padding to at least this length */
540 unsigned long sequence
;
545 long encrypted_len
; /* for SSH2 total-size counting */
548 * State associated with packet logging
552 struct logblank_t
*blanks
;
555 static void ssh1_protocol(Ssh ssh
, void *vin
, int inlen
,
556 struct Packet
*pktin
);
557 static void ssh2_protocol(Ssh ssh
, void *vin
, int inlen
,
558 struct Packet
*pktin
);
559 static void ssh1_protocol_setup(Ssh ssh
);
560 static void ssh2_protocol_setup(Ssh ssh
);
561 static void ssh_size(void *handle
, int width
, int height
);
562 static void ssh_special(void *handle
, Telnet_Special
);
563 static int ssh2_try_send(struct ssh_channel
*c
);
564 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
, int len
);
565 static void ssh_throttle_all(Ssh ssh
, int enable
, int bufsize
);
566 static void ssh2_set_window(struct ssh_channel
*c
, unsigned newwin
);
567 static int ssh_sendbuffer(void *handle
);
568 static int ssh_do_close(Ssh ssh
, int notify_exit
);
569 static unsigned long ssh_pkt_getuint32(struct Packet
*pkt
);
570 static int ssh2_pkt_getbool(struct Packet
*pkt
);
571 static void ssh_pkt_getstring(struct Packet
*pkt
, char **p
, int *length
);
572 static void ssh2_timer(void *ctx
, long now
);
573 static int do_ssh2_transport(Ssh ssh
, void *vin
, int inlen
,
574 struct Packet
*pktin
);
576 struct rdpkt1_state_tag
{
577 long len
, pad
, biglen
, to_read
;
578 unsigned long realcrc
, gotcrc
;
582 struct Packet
*pktin
;
585 struct rdpkt2_state_tag
{
586 long len
, pad
, payload
, packetlen
, maclen
;
589 unsigned long incoming_sequence
;
590 struct Packet
*pktin
;
593 typedef void (*handler_fn_t
)(Ssh ssh
, struct Packet
*pktin
);
594 typedef void (*chandler_fn_t
)(Ssh ssh
, struct Packet
*pktin
, void *ctx
);
596 struct queued_handler
;
597 struct queued_handler
{
599 chandler_fn_t handler
;
601 struct queued_handler
*next
;
605 const struct plug_function_table
*fn
;
606 /* the above field _must_ be first in the structure */
608 SHA_State exhash
, exhashbase
;
615 unsigned char session_key
[32];
617 int v1_remote_protoflags
;
618 int v1_local_protoflags
;
619 int agentfwd_enabled
;
622 const struct ssh_cipher
*cipher
;
625 const struct ssh2_cipher
*cscipher
, *sccipher
;
626 void *cs_cipher_ctx
, *sc_cipher_ctx
;
627 const struct ssh_mac
*csmac
, *scmac
;
628 void *cs_mac_ctx
, *sc_mac_ctx
;
629 const struct ssh_compress
*cscomp
, *sccomp
;
630 void *cs_comp_ctx
, *sc_comp_ctx
;
631 const struct ssh_kex
*kex
;
632 const struct ssh_signkey
*hostkey
;
633 unsigned char v2_session_id
[20];
639 int echoing
, editing
;
643 int ospeed
, ispeed
; /* temporaries */
644 int term_width
, term_height
;
646 tree234
*channels
; /* indexed by local id */
647 struct ssh_channel
*mainchan
; /* primary session channel */
651 tree234
*rportfwds
, *portfwds
;
655 SSH_STATE_BEFORE_SIZE
,
661 int size_needed
, eof_needed
;
663 struct Packet
**queue
;
664 int queuelen
, queuesize
;
666 unsigned char *deferred_send_data
;
667 int deferred_len
, deferred_size
;
670 * Gross hack: pscp will try to start SFTP but fall back to
671 * scp1 if that fails. This variable is the means by which
672 * scp.c can reach into the SSH code and find out which one it
678 * Used for username and password input.
680 char *userpass_input_buffer
;
681 int userpass_input_buflen
;
682 int userpass_input_bufpos
;
683 int userpass_input_echo
;
690 int v1_throttle_count
;
693 int v1_stdout_throttling
;
694 unsigned long v2_outgoing_sequence
;
696 int ssh1_rdpkt_crstate
;
697 int ssh2_rdpkt_crstate
;
698 int do_ssh_init_crstate
;
699 int ssh_gotdata_crstate
;
700 int do_ssh1_login_crstate
;
701 int do_ssh1_connection_crstate
;
702 int do_ssh2_transport_crstate
;
703 int do_ssh2_authconn_crstate
;
705 void *do_ssh_init_state
;
706 void *do_ssh1_login_state
;
707 void *do_ssh2_transport_state
;
708 void *do_ssh2_authconn_state
;
710 struct rdpkt1_state_tag rdpkt1_state
;
711 struct rdpkt2_state_tag rdpkt2_state
;
713 /* ssh1 and ssh2 use this for different things, but both use it */
714 int protocol_initial_phase_done
;
716 void (*protocol
) (Ssh ssh
, void *vin
, int inlen
,
718 struct Packet
*(*s_rdpkt
) (Ssh ssh
, unsigned char **data
, int *datalen
);
721 * We maintain a full _copy_ of a Config structure here, not
722 * merely a pointer to it. That way, when we're passed a new
723 * one for reconfiguration, we can check the differences and
724 * potentially reconfigure port forwardings etc in mid-session.
729 * Used to transfer data back from async agent callbacks.
731 void *agent_response
;
732 int agent_response_len
;
735 * Dispatch table for packet types that we may have to deal
738 handler_fn_t packet_dispatch
[256];
741 * Queues of one-off handler functions for success/failure
742 * indications from a request.
744 struct queued_handler
*qhead
, *qtail
;
747 * This module deals with sending keepalives.
752 * Track incoming and outgoing data sizes and time, for
755 unsigned long incoming_data_size
, outgoing_data_size
, deferred_data_size
;
756 unsigned long max_data_size
;
758 long next_rekey
, last_rekey
;
759 char *deferred_rekey_reason
; /* points to STATIC string; don't free */
762 #define logevent(s) logevent(ssh->frontend, s)
764 /* logevent, only printf-formatted. */
765 static void logeventf(Ssh ssh
, const char *fmt
, ...)
771 buf
= dupvprintf(fmt
, ap
);
777 #define bombout(msg) \
779 char *text = dupprintf msg; \
780 ssh_do_close(ssh, FALSE); \
782 connection_fatal(ssh->frontend, "%s", text); \
786 /* Functions to leave bits out of the SSH packet log file. */
788 static void dont_log_password(Ssh ssh
, struct Packet
*pkt
, int blanktype
)
790 if (ssh
->cfg
.logomitpass
)
791 pkt
->logmode
= blanktype
;
794 static void dont_log_data(Ssh ssh
, struct Packet
*pkt
, int blanktype
)
796 if (ssh
->cfg
.logomitdata
)
797 pkt
->logmode
= blanktype
;
800 static void end_log_omission(Ssh ssh
, struct Packet
*pkt
)
802 pkt
->logmode
= PKTLOG_EMIT
;
805 static int ssh_channelcmp(void *av
, void *bv
)
807 struct ssh_channel
*a
= (struct ssh_channel
*) av
;
808 struct ssh_channel
*b
= (struct ssh_channel
*) bv
;
809 if (a
->localid
< b
->localid
)
811 if (a
->localid
> b
->localid
)
815 static int ssh_channelfind(void *av
, void *bv
)
817 unsigned *a
= (unsigned *) av
;
818 struct ssh_channel
*b
= (struct ssh_channel
*) bv
;
826 static int ssh_rportcmp_ssh1(void *av
, void *bv
)
828 struct ssh_rportfwd
*a
= (struct ssh_rportfwd
*) av
;
829 struct ssh_rportfwd
*b
= (struct ssh_rportfwd
*) bv
;
831 if ( (i
= strcmp(a
->dhost
, b
->dhost
)) != 0)
832 return i
< 0 ?
-1 : +1;
833 if (a
->dport
> b
->dport
)
835 if (a
->dport
< b
->dport
)
840 static int ssh_rportcmp_ssh2(void *av
, void *bv
)
842 struct ssh_rportfwd
*a
= (struct ssh_rportfwd
*) av
;
843 struct ssh_rportfwd
*b
= (struct ssh_rportfwd
*) bv
;
845 if (a
->sport
> b
->sport
)
847 if (a
->sport
< b
->sport
)
853 * Special form of strcmp which can cope with NULL inputs. NULL is
854 * defined to sort before even the empty string.
856 static int nullstrcmp(const char *a
, const char *b
)
858 if (a
== NULL
&& b
== NULL
)
867 static int ssh_portcmp(void *av
, void *bv
)
869 struct ssh_portfwd
*a
= (struct ssh_portfwd
*) av
;
870 struct ssh_portfwd
*b
= (struct ssh_portfwd
*) bv
;
872 if (a
->type
> b
->type
)
874 if (a
->type
< b
->type
)
876 if (a
->addressfamily
> b
->addressfamily
)
878 if (a
->addressfamily
< b
->addressfamily
)
880 if ( (i
= nullstrcmp(a
->saddr
, b
->saddr
)) != 0)
881 return i
< 0 ?
-1 : +1;
882 if (a
->sport
> b
->sport
)
884 if (a
->sport
< b
->sport
)
886 if (a
->type
!= 'D') {
887 if ( (i
= nullstrcmp(a
->daddr
, b
->daddr
)) != 0)
888 return i
< 0 ?
-1 : +1;
889 if (a
->dport
> b
->dport
)
891 if (a
->dport
< b
->dport
)
897 static int alloc_channel_id(Ssh ssh
)
899 const unsigned CHANNEL_NUMBER_OFFSET
= 256;
900 unsigned low
, high
, mid
;
902 struct ssh_channel
*c
;
905 * First-fit allocation of channel numbers: always pick the
906 * lowest unused one. To do this, binary-search using the
907 * counted B-tree to find the largest channel ID which is in a
908 * contiguous sequence from the beginning. (Precisely
909 * everything in that sequence must have ID equal to its tree
910 * index plus CHANNEL_NUMBER_OFFSET.)
912 tsize
= count234(ssh
->channels
);
916 while (high
- low
> 1) {
917 mid
= (high
+ low
) / 2;
918 c
= index234(ssh
->channels
, mid
);
919 if (c
->localid
== mid
+ CHANNEL_NUMBER_OFFSET
)
920 low
= mid
; /* this one is fine */
922 high
= mid
; /* this one is past it */
925 * Now low points to either -1, or the tree index of the
926 * largest ID in the initial sequence.
929 unsigned i
= low
+ 1 + CHANNEL_NUMBER_OFFSET
;
930 assert(NULL
== find234(ssh
->channels
, &i
, ssh_channelfind
));
932 return low
+ 1 + CHANNEL_NUMBER_OFFSET
;
935 static void c_write(Ssh ssh
, const char *buf
, int len
)
937 if ((flags
& FLAG_STDERR
)) {
939 for (i
= 0; i
< len
; i
++)
941 fputc(buf
[i
], stderr
);
944 from_backend(ssh
->frontend
, 1, buf
, len
);
947 static void c_write_untrusted(Ssh ssh
, const char *buf
, int len
)
950 for (i
= 0; i
< len
; i
++) {
952 c_write(ssh
, "\r\n", 2);
953 else if ((buf
[i
] & 0x60) || (buf
[i
] == '\r'))
954 c_write(ssh
, buf
+ i
, 1);
958 static void c_write_str(Ssh ssh
, const char *buf
)
960 c_write(ssh
, buf
, strlen(buf
));
963 static void ssh_free_packet(struct Packet
*pkt
)
968 static struct Packet
*ssh_new_packet(void)
970 struct Packet
*pkt
= snew(struct Packet
);
974 pkt
->logmode
= PKTLOG_EMIT
;
982 * Collect incoming data in the incoming packet buffer.
983 * Decipher and verify the packet when it is completely read.
984 * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets.
985 * Update the *data and *datalen variables.
986 * Return a Packet structure when a packet is completed.
988 static struct Packet
*ssh1_rdpkt(Ssh ssh
, unsigned char **data
, int *datalen
)
990 struct rdpkt1_state_tag
*st
= &ssh
->rdpkt1_state
;
992 crBegin(ssh
->ssh1_rdpkt_crstate
);
994 st
->pktin
= ssh_new_packet();
997 st
->pktin
->length
= 0;
999 for (st
->i
= st
->len
= 0; st
->i
< 4; st
->i
++) {
1000 while ((*datalen
) == 0)
1002 st
->len
= (st
->len
<< 8) + **data
;
1003 (*data
)++, (*datalen
)--;
1006 st
->pad
= 8 - (st
->len
% 8);
1007 st
->biglen
= st
->len
+ st
->pad
;
1008 st
->pktin
->length
= st
->len
- 5;
1010 if (st
->biglen
< 0) {
1011 bombout(("Extremely large packet length from server suggests"
1012 " data stream corruption"));
1013 ssh_free_packet(st
->pktin
);
1017 st
->pktin
->maxlen
= st
->biglen
;
1018 st
->pktin
->data
= snewn(st
->biglen
+ APIEXTRA
, unsigned char);
1020 st
->to_read
= st
->biglen
;
1021 st
->p
= st
->pktin
->data
;
1022 while (st
->to_read
> 0) {
1023 st
->chunk
= st
->to_read
;
1024 while ((*datalen
) == 0)
1026 if (st
->chunk
> (*datalen
))
1027 st
->chunk
= (*datalen
);
1028 memcpy(st
->p
, *data
, st
->chunk
);
1030 *datalen
-= st
->chunk
;
1032 st
->to_read
-= st
->chunk
;
1035 if (ssh
->cipher
&& detect_attack(ssh
->crcda_ctx
, st
->pktin
->data
,
1036 st
->biglen
, NULL
)) {
1037 bombout(("Network attack (CRC compensation) detected!"));
1038 ssh_free_packet(st
->pktin
);
1043 ssh
->cipher
->decrypt(ssh
->v1_cipher_ctx
, st
->pktin
->data
, st
->biglen
);
1045 st
->realcrc
= crc32_compute(st
->pktin
->data
, st
->biglen
- 4);
1046 st
->gotcrc
= GET_32BIT(st
->pktin
->data
+ st
->biglen
- 4);
1047 if (st
->gotcrc
!= st
->realcrc
) {
1048 bombout(("Incorrect CRC received on packet"));
1049 ssh_free_packet(st
->pktin
);
1053 st
->pktin
->body
= st
->pktin
->data
+ st
->pad
+ 1;
1054 st
->pktin
->savedpos
= 0;
1056 if (ssh
->v1_compressing
) {
1057 unsigned char *decompblk
;
1059 if (!zlib_decompress_block(ssh
->sc_comp_ctx
,
1060 st
->pktin
->body
- 1, st
->pktin
->length
+ 1,
1061 &decompblk
, &decomplen
)) {
1062 bombout(("Zlib decompression encountered invalid data"));
1063 ssh_free_packet(st
->pktin
);
1067 if (st
->pktin
->maxlen
< st
->pad
+ decomplen
) {
1068 st
->pktin
->maxlen
= st
->pad
+ decomplen
;
1069 st
->pktin
->data
= sresize(st
->pktin
->data
,
1070 st
->pktin
->maxlen
+ APIEXTRA
,
1072 st
->pktin
->body
= st
->pktin
->data
+ st
->pad
+ 1;
1075 memcpy(st
->pktin
->body
- 1, decompblk
, decomplen
);
1077 st
->pktin
->length
= decomplen
- 1;
1080 st
->pktin
->type
= st
->pktin
->body
[-1];
1083 * Log incoming packet, possibly omitting sensitive fields.
1087 struct logblank_t blank
;
1088 if (ssh
->cfg
.logomitdata
) {
1089 int do_blank
= FALSE
, blank_prefix
= 0;
1090 /* "Session data" packets - omit the data field */
1091 if ((st
->pktin
->type
== SSH1_SMSG_STDOUT_DATA
) ||
1092 (st
->pktin
->type
== SSH1_SMSG_STDERR_DATA
)) {
1093 do_blank
= TRUE
; blank_prefix
= 0;
1094 } else if (st
->pktin
->type
== SSH1_MSG_CHANNEL_DATA
) {
1095 do_blank
= TRUE
; blank_prefix
= 4;
1098 blank
.offset
= blank_prefix
;
1099 blank
.len
= st
->pktin
->length
;
1100 blank
.type
= PKTLOG_OMIT
;
1104 log_packet(ssh
->logctx
,
1105 PKT_INCOMING
, st
->pktin
->type
,
1106 ssh1_pkt_type(st
->pktin
->type
),
1107 st
->pktin
->body
, st
->pktin
->length
,
1111 crFinish(st
->pktin
);
1114 static struct Packet
*ssh2_rdpkt(Ssh ssh
, unsigned char **data
, int *datalen
)
1116 struct rdpkt2_state_tag
*st
= &ssh
->rdpkt2_state
;
1118 crBegin(ssh
->ssh2_rdpkt_crstate
);
1120 st
->pktin
= ssh_new_packet();
1122 st
->pktin
->type
= 0;
1123 st
->pktin
->length
= 0;
1125 st
->cipherblk
= ssh
->sccipher
->blksize
;
1128 if (st
->cipherblk
< 8)
1131 st
->pktin
->data
= snewn(st
->cipherblk
+ APIEXTRA
, unsigned char);
1134 * Acquire and decrypt the first block of the packet. This will
1135 * contain the length and padding details.
1137 for (st
->i
= st
->len
= 0; st
->i
< st
->cipherblk
; st
->i
++) {
1138 while ((*datalen
) == 0)
1140 st
->pktin
->data
[st
->i
] = *(*data
)++;
1145 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
1146 st
->pktin
->data
, st
->cipherblk
);
1149 * Now get the length and padding figures.
1151 st
->len
= GET_32BIT(st
->pktin
->data
);
1152 st
->pad
= st
->pktin
->data
[4];
1155 * _Completely_ silly lengths should be stomped on before they
1156 * do us any more damage.
1158 if (st
->len
< 0 || st
->pad
< 0 || st
->len
+ st
->pad
< 0) {
1159 bombout(("Incoming packet was garbled on decryption"));
1160 ssh_free_packet(st
->pktin
);
1165 * This enables us to deduce the payload length.
1167 st
->payload
= st
->len
- st
->pad
- 1;
1169 st
->pktin
->length
= st
->payload
+ 5;
1172 * So now we can work out the total packet length.
1174 st
->packetlen
= st
->len
+ 4;
1175 st
->maclen
= ssh
->scmac ? ssh
->scmac
->len
: 0;
1178 * Allocate memory for the rest of the packet.
1180 st
->pktin
->maxlen
= st
->packetlen
+ st
->maclen
;
1181 st
->pktin
->data
= sresize(st
->pktin
->data
,
1182 st
->pktin
->maxlen
+ APIEXTRA
,
1186 * Read and decrypt the remainder of the packet.
1188 for (st
->i
= st
->cipherblk
; st
->i
< st
->packetlen
+ st
->maclen
;
1190 while ((*datalen
) == 0)
1192 st
->pktin
->data
[st
->i
] = *(*data
)++;
1195 /* Decrypt everything _except_ the MAC. */
1197 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
1198 st
->pktin
->data
+ st
->cipherblk
,
1199 st
->packetlen
- st
->cipherblk
);
1201 st
->pktin
->encrypted_len
= st
->packetlen
;
1207 && !ssh
->scmac
->verify(ssh
->sc_mac_ctx
, st
->pktin
->data
, st
->len
+ 4,
1208 st
->incoming_sequence
)) {
1209 bombout(("Incorrect MAC received on packet"));
1210 ssh_free_packet(st
->pktin
);
1214 st
->pktin
->sequence
= st
->incoming_sequence
++;
1217 * Decompress packet payload.
1220 unsigned char *newpayload
;
1223 ssh
->sccomp
->decompress(ssh
->sc_comp_ctx
,
1224 st
->pktin
->data
+ 5, st
->pktin
->length
- 5,
1225 &newpayload
, &newlen
)) {
1226 if (st
->pktin
->maxlen
< newlen
+ 5) {
1227 st
->pktin
->maxlen
= newlen
+ 5;
1228 st
->pktin
->data
= sresize(st
->pktin
->data
,
1229 st
->pktin
->maxlen
+ APIEXTRA
,
1232 st
->pktin
->length
= 5 + newlen
;
1233 memcpy(st
->pktin
->data
+ 5, newpayload
, newlen
);
1238 st
->pktin
->savedpos
= 6;
1239 st
->pktin
->body
= st
->pktin
->data
;
1240 st
->pktin
->type
= st
->pktin
->data
[5];
1243 * Log incoming packet, possibly omitting sensitive fields.
1247 struct logblank_t blank
;
1248 if (ssh
->cfg
.logomitdata
) {
1249 int do_blank
= FALSE
, blank_prefix
= 0;
1250 /* "Session data" packets - omit the data field */
1251 if (st
->pktin
->type
== SSH2_MSG_CHANNEL_DATA
) {
1252 do_blank
= TRUE
; blank_prefix
= 4;
1253 } else if (st
->pktin
->type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
) {
1254 do_blank
= TRUE
; blank_prefix
= 8;
1257 blank
.offset
= blank_prefix
;
1258 blank
.len
= (st
->pktin
->length
-6) - blank_prefix
;
1259 blank
.type
= PKTLOG_OMIT
;
1263 log_packet(ssh
->logctx
, PKT_INCOMING
, st
->pktin
->type
,
1264 ssh2_pkt_type(ssh
->pkt_ctx
, st
->pktin
->type
),
1265 st
->pktin
->data
+6, st
->pktin
->length
-6,
1269 crFinish(st
->pktin
);
1272 static void ssh1_pktout_size(struct Packet
*pkt
, int len
)
1276 len
+= 5; /* type and CRC */
1277 pad
= 8 - (len
% 8);
1280 pkt
->length
= len
- 5;
1281 if (pkt
->maxlen
< biglen
) {
1282 pkt
->maxlen
= biglen
;
1283 pkt
->data
= sresize(pkt
->data
, biglen
+ 4 + APIEXTRA
, unsigned char);
1285 pkt
->body
= pkt
->data
+ 4 + pad
+ 1;
1288 static struct Packet
*s_wrpkt_start(int type
, int len
)
1290 struct Packet
*pkt
= ssh_new_packet();
1291 ssh1_pktout_size(pkt
, len
);
1293 /* Initialise log omission state */
1299 static int s_wrpkt_prepare(Ssh ssh
, struct Packet
*pkt
)
1305 * XXX various versions of SC (including 8.8.4) screw up the
1306 * register allocation in this function and use the same register
1307 * (D6) for len and as a temporary, with predictable results. The
1308 * following sledgehammer prevents this.
1314 pkt
->body
[-1] = pkt
->type
;
1317 log_packet(ssh
->logctx
, PKT_OUTGOING
, pkt
->type
,
1318 ssh1_pkt_type(pkt
->type
),
1319 pkt
->body
, pkt
->length
,
1320 pkt
->nblanks
, pkt
->blanks
);
1321 sfree(pkt
->blanks
); pkt
->blanks
= NULL
;
1324 if (ssh
->v1_compressing
) {
1325 unsigned char *compblk
;
1327 zlib_compress_block(ssh
->cs_comp_ctx
,
1328 pkt
->body
- 1, pkt
->length
+ 1,
1329 &compblk
, &complen
);
1330 ssh1_pktout_size(pkt
, complen
- 1);
1331 memcpy(pkt
->body
- 1, compblk
, complen
);
1335 len
= pkt
->length
+ 5; /* type and CRC */
1336 pad
= 8 - (len
% 8);
1339 for (i
= 0; i
< pad
; i
++)
1340 pkt
->data
[i
+ 4] = random_byte();
1341 crc
= crc32_compute(pkt
->data
+ 4, biglen
- 4);
1342 PUT_32BIT(pkt
->data
+ biglen
, crc
);
1343 PUT_32BIT(pkt
->data
, len
);
1346 ssh
->cipher
->encrypt(ssh
->v1_cipher_ctx
, pkt
->data
+ 4, biglen
);
1351 static void s_wrpkt(Ssh ssh
, struct Packet
*pkt
)
1354 len
= s_wrpkt_prepare(ssh
, pkt
);
1355 backlog
= sk_write(ssh
->s
, (char *)pkt
->data
, len
);
1356 if (backlog
> SSH_MAX_BACKLOG
)
1357 ssh_throttle_all(ssh
, 1, backlog
);
1360 static void s_wrpkt_defer(Ssh ssh
, struct Packet
*pkt
)
1363 len
= s_wrpkt_prepare(ssh
, pkt
);
1364 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1365 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1366 ssh
->deferred_send_data
= sresize(ssh
->deferred_send_data
,
1370 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, pkt
->data
, len
);
1371 ssh
->deferred_len
+= len
;
1375 * Construct a packet with the specified contents.
1377 static struct Packet
*construct_packet(Ssh ssh
, int pkttype
,
1378 va_list ap1
, va_list ap2
)
1380 unsigned char *p
, *argp
, argchar
;
1381 unsigned long argint
;
1382 int pktlen
, argtype
, arglen
;
1387 while ((argtype
= va_arg(ap1
, int)) != PKT_END
) {
1390 (void) va_arg(ap1
, int);
1394 (void) va_arg(ap1
, int);
1398 (void) va_arg(ap1
, unsigned char *);
1399 arglen
= va_arg(ap1
, int);
1403 argp
= va_arg(ap1
, unsigned char *);
1404 arglen
= strlen((char *)argp
);
1405 pktlen
+= 4 + arglen
;
1408 bn
= va_arg(ap1
, Bignum
);
1409 pktlen
+= ssh1_bignum_length(bn
);
1414 /* ignore this pass */
1421 pkt
= s_wrpkt_start(pkttype
, pktlen
);
1424 while ((argtype
= va_arg(ap2
, int)) != PKT_END
) {
1425 int offset
= p
- pkt
->body
, len
= 0;
1427 /* Actual fields in the packet */
1429 argint
= va_arg(ap2
, int);
1430 PUT_32BIT(p
, argint
);
1434 argchar
= (unsigned char) va_arg(ap2
, int);
1439 argp
= va_arg(ap2
, unsigned char *);
1440 arglen
= va_arg(ap2
, int);
1441 memcpy(p
, argp
, arglen
);
1445 argp
= va_arg(ap2
, unsigned char *);
1446 arglen
= strlen((char *)argp
);
1447 PUT_32BIT(p
, arglen
);
1448 memcpy(p
+ 4, argp
, arglen
);
1452 bn
= va_arg(ap2
, Bignum
);
1453 len
= ssh1_write_bignum(p
, bn
);
1455 /* Tokens for modifications to packet logging */
1457 dont_log_password(ssh
, pkt
, PKTLOG_BLANK
);
1460 dont_log_data(ssh
, pkt
, PKTLOG_OMIT
);
1463 end_log_omission(ssh
, pkt
);
1467 /* Deal with logfile omission, if required. */
1468 if (len
&& (pkt
->logmode
!= PKTLOG_EMIT
)) {
1470 pkt
->blanks
= sresize(pkt
->blanks
, pkt
->nblanks
,
1472 pkt
->blanks
[pkt
->nblanks
-1].offset
= offset
;
1473 pkt
->blanks
[pkt
->nblanks
-1].len
= len
;
1474 pkt
->blanks
[pkt
->nblanks
-1].type
= pkt
->logmode
;
1481 static void send_packet(Ssh ssh
, int pkttype
, ...)
1485 va_start(ap1
, pkttype
);
1486 va_start(ap2
, pkttype
);
1487 pkt
= construct_packet(ssh
, pkttype
, ap1
, ap2
);
1491 ssh_free_packet(pkt
);
1494 static void defer_packet(Ssh ssh
, int pkttype
, ...)
1498 va_start(ap1
, pkttype
);
1499 va_start(ap2
, pkttype
);
1500 pkt
= construct_packet(ssh
, pkttype
, ap1
, ap2
);
1503 s_wrpkt_defer(ssh
, pkt
);
1504 ssh_free_packet(pkt
);
1507 static int ssh_versioncmp(char *a
, char *b
)
1510 unsigned long av
, bv
;
1512 av
= strtoul(a
, &ae
, 10);
1513 bv
= strtoul(b
, &be
, 10);
1515 return (av
< bv ?
-1 : +1);
1520 av
= strtoul(ae
, &ae
, 10);
1521 bv
= strtoul(be
, &be
, 10);
1523 return (av
< bv ?
-1 : +1);
1528 * Utility routines for putting an SSH-protocol `string' and
1529 * `uint32' into a SHA state.
1532 static void sha_string(SHA_State
* s
, void *str
, int len
)
1534 unsigned char lenblk
[4];
1535 PUT_32BIT(lenblk
, len
);
1536 SHA_Bytes(s
, lenblk
, 4);
1537 SHA_Bytes(s
, str
, len
);
1540 static void sha_uint32(SHA_State
* s
, unsigned i
)
1542 unsigned char intblk
[4];
1543 PUT_32BIT(intblk
, i
);
1544 SHA_Bytes(s
, intblk
, 4);
1548 * SSH2 packet construction functions.
1550 static void ssh2_pkt_ensure(struct Packet
*pkt
, int length
)
1552 if (pkt
->maxlen
< length
) {
1553 pkt
->maxlen
= length
+ 256;
1554 pkt
->data
= sresize(pkt
->data
, pkt
->maxlen
+ APIEXTRA
, unsigned char);
1557 static void ssh2_pkt_adddata(struct Packet
*pkt
, void *data
, int len
)
1559 if (pkt
->logmode
!= PKTLOG_EMIT
) {
1561 pkt
->blanks
= sresize(pkt
->blanks
, pkt
->nblanks
, struct logblank_t
);
1562 pkt
->blanks
[pkt
->nblanks
-1].offset
= pkt
->length
- 6;
1563 pkt
->blanks
[pkt
->nblanks
-1].len
= len
;
1564 pkt
->blanks
[pkt
->nblanks
-1].type
= pkt
->logmode
;
1567 ssh2_pkt_ensure(pkt
, pkt
->length
);
1568 memcpy(pkt
->data
+ pkt
->length
- len
, data
, len
);
1570 static void ssh2_pkt_addbyte(struct Packet
*pkt
, unsigned char byte
)
1572 ssh2_pkt_adddata(pkt
, &byte
, 1);
1574 static struct Packet
*ssh2_pkt_init(int pkt_type
)
1576 struct Packet
*pkt
= ssh_new_packet();
1579 ssh2_pkt_addbyte(pkt
, (unsigned char) pkt_type
);
1582 static void ssh2_pkt_addbool(struct Packet
*pkt
, unsigned char value
)
1584 ssh2_pkt_adddata(pkt
, &value
, 1);
1586 static void ssh2_pkt_adduint32(struct Packet
*pkt
, unsigned long value
)
1589 PUT_32BIT(x
, value
);
1590 ssh2_pkt_adddata(pkt
, x
, 4);
1592 static void ssh2_pkt_addstring_start(struct Packet
*pkt
)
1594 ssh2_pkt_adduint32(pkt
, 0);
1595 pkt
->savedpos
= pkt
->length
;
1597 static void ssh2_pkt_addstring_str(struct Packet
*pkt
, char *data
)
1599 ssh2_pkt_adddata(pkt
, data
, strlen(data
));
1600 PUT_32BIT(pkt
->data
+ pkt
->savedpos
- 4, pkt
->length
- pkt
->savedpos
);
1602 static void ssh2_pkt_addstring_data(struct Packet
*pkt
, char *data
, int len
)
1604 ssh2_pkt_adddata(pkt
, data
, len
);
1605 PUT_32BIT(pkt
->data
+ pkt
->savedpos
- 4, pkt
->length
- pkt
->savedpos
);
1607 static void ssh2_pkt_addstring(struct Packet
*pkt
, char *data
)
1609 ssh2_pkt_addstring_start(pkt
);
1610 ssh2_pkt_addstring_str(pkt
, data
);
1612 static unsigned char *ssh2_mpint_fmt(Bignum b
, int *len
)
1615 int i
, n
= (bignum_bitcount(b
) + 7) / 8;
1616 p
= snewn(n
+ 1, unsigned char);
1618 fatalbox("out of memory");
1620 for (i
= 1; i
<= n
; i
++)
1621 p
[i
] = bignum_byte(b
, n
- i
);
1623 while (i
<= n
&& p
[i
] == 0 && (p
[i
+ 1] & 0x80) == 0)
1625 memmove(p
, p
+ i
, n
+ 1 - i
);
1629 static void ssh2_pkt_addmp(struct Packet
*pkt
, Bignum b
)
1633 p
= ssh2_mpint_fmt(b
, &len
);
1634 ssh2_pkt_addstring_start(pkt
);
1635 ssh2_pkt_addstring_data(pkt
, (char *)p
, len
);
1640 * Construct an SSH2 final-form packet: compress it, encrypt it,
1641 * put the MAC on it. Final packet, ready to be sent, is stored in
1642 * pkt->data. Total length is returned.
1644 static int ssh2_pkt_construct(Ssh ssh
, struct Packet
*pkt
)
1646 int cipherblk
, maclen
, padding
, i
;
1649 log_packet(ssh
->logctx
, PKT_OUTGOING
, pkt
->data
[5],
1650 ssh2_pkt_type(ssh
->pkt_ctx
, pkt
->data
[5]),
1651 pkt
->data
+ 6, pkt
->length
- 6,
1652 pkt
->nblanks
, pkt
->blanks
);
1653 sfree(pkt
->blanks
); pkt
->blanks
= NULL
;
1657 * Compress packet payload.
1660 unsigned char *newpayload
;
1663 ssh
->cscomp
->compress(ssh
->cs_comp_ctx
, pkt
->data
+ 5,
1665 &newpayload
, &newlen
)) {
1667 ssh2_pkt_adddata(pkt
, newpayload
, newlen
);
1673 * Add padding. At least four bytes, and must also bring total
1674 * length (minus MAC) up to a multiple of the block size.
1675 * If pkt->forcepad is set, make sure the packet is at least that size
1678 cipherblk
= ssh
->cscipher ? ssh
->cscipher
->blksize
: 8; /* block size */
1679 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
1681 if (pkt
->length
+ padding
< pkt
->forcepad
)
1682 padding
= pkt
->forcepad
- pkt
->length
;
1684 (cipherblk
- (pkt
->length
+ padding
) % cipherblk
) % cipherblk
;
1685 assert(padding
<= 255);
1686 maclen
= ssh
->csmac ? ssh
->csmac
->len
: 0;
1687 ssh2_pkt_ensure(pkt
, pkt
->length
+ padding
+ maclen
);
1688 pkt
->data
[4] = padding
;
1689 for (i
= 0; i
< padding
; i
++)
1690 pkt
->data
[pkt
->length
+ i
] = random_byte();
1691 PUT_32BIT(pkt
->data
, pkt
->length
+ padding
- 4);
1693 ssh
->csmac
->generate(ssh
->cs_mac_ctx
, pkt
->data
,
1694 pkt
->length
+ padding
,
1695 ssh
->v2_outgoing_sequence
);
1696 ssh
->v2_outgoing_sequence
++; /* whether or not we MACed */
1699 ssh
->cscipher
->encrypt(ssh
->cs_cipher_ctx
,
1700 pkt
->data
, pkt
->length
+ padding
);
1702 pkt
->encrypted_len
= pkt
->length
+ padding
;
1704 /* Ready-to-send packet starts at pkt->data. We return length. */
1705 return pkt
->length
+ padding
+ maclen
;
1709 * Routines called from the main SSH code to send packets. There
1710 * are quite a few of these, because we have two separate
1711 * mechanisms for delaying the sending of packets:
1713 * - In order to send an IGNORE message and a password message in
1714 * a single fixed-length blob, we require the ability to
1715 * concatenate the encrypted forms of those two packets _into_ a
1716 * single blob and then pass it to our <network.h> transport
1717 * layer in one go. Hence, there's a deferment mechanism which
1718 * works after packet encryption.
1720 * - In order to avoid sending any connection-layer messages
1721 * during repeat key exchange, we have to queue up any such
1722 * outgoing messages _before_ they are encrypted (and in
1723 * particular before they're allocated sequence numbers), and
1724 * then send them once we've finished.
1726 * I call these mechanisms `defer' and `queue' respectively, so as
1727 * to distinguish them reasonably easily.
1729 * The functions send_noqueue() and defer_noqueue() free the packet
1730 * structure they are passed. Every outgoing packet goes through
1731 * precisely one of these functions in its life; packets passed to
1732 * ssh2_pkt_send() or ssh2_pkt_defer() either go straight to one of
1733 * these or get queued, and then when the queue is later emptied
1734 * the packets are all passed to defer_noqueue().
1738 * Send an SSH2 packet immediately, without queuing or deferring.
1740 static void ssh2_pkt_send_noqueue(Ssh ssh
, struct Packet
*pkt
)
1744 len
= ssh2_pkt_construct(ssh
, pkt
);
1745 backlog
= sk_write(ssh
->s
, (char *)pkt
->data
, len
);
1746 if (backlog
> SSH_MAX_BACKLOG
)
1747 ssh_throttle_all(ssh
, 1, backlog
);
1749 ssh
->outgoing_data_size
+= pkt
->encrypted_len
;
1750 if (!ssh
->kex_in_progress
&&
1751 ssh
->max_data_size
!= 0 &&
1752 ssh
->outgoing_data_size
> ssh
->max_data_size
)
1753 do_ssh2_transport(ssh
, "too much data sent", -1, NULL
);
1755 ssh_free_packet(pkt
);
1759 * Defer an SSH2 packet.
1761 static void ssh2_pkt_defer_noqueue(Ssh ssh
, struct Packet
*pkt
)
1763 int len
= ssh2_pkt_construct(ssh
, pkt
);
1764 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1765 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1766 ssh
->deferred_send_data
= sresize(ssh
->deferred_send_data
,
1770 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, pkt
->data
, len
);
1771 ssh
->deferred_len
+= len
;
1772 ssh
->deferred_data_size
+= pkt
->encrypted_len
;
1773 ssh_free_packet(pkt
);
1777 * Queue an SSH2 packet.
1779 static void ssh2_pkt_queue(Ssh ssh
, struct Packet
*pkt
)
1781 assert(ssh
->queueing
);
1783 if (ssh
->queuelen
>= ssh
->queuesize
) {
1784 ssh
->queuesize
= ssh
->queuelen
+ 32;
1785 ssh
->queue
= sresize(ssh
->queue
, ssh
->queuesize
, struct Packet
*);
1788 ssh
->queue
[ssh
->queuelen
++] = pkt
;
1792 * Either queue or send a packet, depending on whether queueing is
1795 static void ssh2_pkt_send(Ssh ssh
, struct Packet
*pkt
)
1798 ssh2_pkt_queue(ssh
, pkt
);
1800 ssh2_pkt_send_noqueue(ssh
, pkt
);
1805 * Either queue or defer a packet, depending on whether queueing is
1808 static void ssh2_pkt_defer(Ssh ssh
, struct Packet
*pkt
)
1811 ssh2_pkt_queue(ssh
, pkt
);
1813 ssh2_pkt_defer_noqueue(ssh
, pkt
);
1818 * Send the whole deferred data block constructed by
1819 * ssh2_pkt_defer() or SSH1's defer_packet().
1821 * The expected use of the defer mechanism is that you call
1822 * ssh2_pkt_defer() a few times, then call ssh_pkt_defersend(). If
1823 * not currently queueing, this simply sets up deferred_send_data
1824 * and then sends it. If we _are_ currently queueing, the calls to
1825 * ssh2_pkt_defer() put the deferred packets on to the queue
1826 * instead, and therefore ssh_pkt_defersend() has no deferred data
1827 * to send. Hence, there's no need to make it conditional on
1830 static void ssh_pkt_defersend(Ssh ssh
)
1833 backlog
= sk_write(ssh
->s
, (char *)ssh
->deferred_send_data
,
1835 ssh
->deferred_len
= ssh
->deferred_size
= 0;
1836 sfree(ssh
->deferred_send_data
);
1837 ssh
->deferred_send_data
= NULL
;
1838 if (backlog
> SSH_MAX_BACKLOG
)
1839 ssh_throttle_all(ssh
, 1, backlog
);
1841 ssh
->outgoing_data_size
+= ssh
->deferred_data_size
;
1842 if (!ssh
->kex_in_progress
&&
1843 ssh
->max_data_size
!= 0 &&
1844 ssh
->outgoing_data_size
> ssh
->max_data_size
)
1845 do_ssh2_transport(ssh
, "too much data sent", -1, NULL
);
1846 ssh
->deferred_data_size
= 0;
1850 * Send all queued SSH2 packets. We send them by means of
1851 * ssh2_pkt_defer_noqueue(), in case they included a pair of
1852 * packets that needed to be lumped together.
1854 static void ssh2_pkt_queuesend(Ssh ssh
)
1858 assert(!ssh
->queueing
);
1860 for (i
= 0; i
< ssh
->queuelen
; i
++)
1861 ssh2_pkt_defer_noqueue(ssh
, ssh
->queue
[i
]);
1864 ssh_pkt_defersend(ssh
);
1868 void bndebug(char *string
, Bignum b
)
1872 p
= ssh2_mpint_fmt(b
, &len
);
1873 debug(("%s", string
));
1874 for (i
= 0; i
< len
; i
++)
1875 debug((" %02x", p
[i
]));
1881 static void sha_mpint(SHA_State
* s
, Bignum b
)
1885 p
= ssh2_mpint_fmt(b
, &len
);
1886 sha_string(s
, p
, len
);
1891 * Packet decode functions for both SSH1 and SSH2.
1893 static unsigned long ssh_pkt_getuint32(struct Packet
*pkt
)
1895 unsigned long value
;
1896 if (pkt
->length
- pkt
->savedpos
< 4)
1897 return 0; /* arrgh, no way to decline (FIXME?) */
1898 value
= GET_32BIT(pkt
->body
+ pkt
->savedpos
);
1902 static int ssh2_pkt_getbool(struct Packet
*pkt
)
1904 unsigned long value
;
1905 if (pkt
->length
- pkt
->savedpos
< 1)
1906 return 0; /* arrgh, no way to decline (FIXME?) */
1907 value
= pkt
->body
[pkt
->savedpos
] != 0;
1911 static void ssh_pkt_getstring(struct Packet
*pkt
, char **p
, int *length
)
1916 if (pkt
->length
- pkt
->savedpos
< 4)
1918 len
= GET_32BIT(pkt
->body
+ pkt
->savedpos
);
1923 if (pkt
->length
- pkt
->savedpos
< *length
)
1925 *p
= (char *)(pkt
->body
+ pkt
->savedpos
);
1926 pkt
->savedpos
+= *length
;
1928 static void *ssh_pkt_getdata(struct Packet
*pkt
, int length
)
1930 if (pkt
->length
- pkt
->savedpos
< length
)
1932 pkt
->savedpos
+= length
;
1933 return pkt
->body
+ (pkt
->savedpos
- length
);
1935 static int ssh1_pkt_getrsakey(struct Packet
*pkt
, struct RSAKey
*key
,
1936 unsigned char **keystr
)
1940 j
= makekey(pkt
->body
+ pkt
->savedpos
,
1941 pkt
->length
- pkt
->savedpos
,
1948 assert(pkt
->savedpos
< pkt
->length
);
1952 static Bignum
ssh1_pkt_getmp(struct Packet
*pkt
)
1957 j
= ssh1_read_bignum(pkt
->body
+ pkt
->savedpos
,
1958 pkt
->length
- pkt
->savedpos
, &b
);
1966 static Bignum
ssh2_pkt_getmp(struct Packet
*pkt
)
1972 ssh_pkt_getstring(pkt
, &p
, &length
);
1977 b
= bignum_from_bytes((unsigned char *)p
, length
);
1982 * Helper function to add an SSH2 signature blob to a packet.
1983 * Expects to be shown the public key blob as well as the signature
1984 * blob. Normally works just like ssh2_pkt_addstring, but will
1985 * fiddle with the signature packet if necessary for
1986 * BUG_SSH2_RSA_PADDING.
1988 static void ssh2_add_sigblob(Ssh ssh
, struct Packet
*pkt
,
1989 void *pkblob_v
, int pkblob_len
,
1990 void *sigblob_v
, int sigblob_len
)
1992 unsigned char *pkblob
= (unsigned char *)pkblob_v
;
1993 unsigned char *sigblob
= (unsigned char *)sigblob_v
;
1995 /* dmemdump(pkblob, pkblob_len); */
1996 /* dmemdump(sigblob, sigblob_len); */
1999 * See if this is in fact an ssh-rsa signature and a buggy
2000 * server; otherwise we can just do this the easy way.
2002 if ((ssh
->remote_bugs
& BUG_SSH2_RSA_PADDING
) &&
2003 (GET_32BIT(pkblob
) == 7 && !memcmp(pkblob
+4, "ssh-rsa", 7))) {
2004 int pos
, len
, siglen
;
2007 * Find the byte length of the modulus.
2010 pos
= 4+7; /* skip over "ssh-rsa" */
2011 pos
+= 4 + GET_32BIT(pkblob
+pos
); /* skip over exponent */
2012 len
= GET_32BIT(pkblob
+pos
); /* find length of modulus */
2013 pos
+= 4; /* find modulus itself */
2014 while (len
> 0 && pkblob
[pos
] == 0)
2016 /* debug(("modulus length is %d\n", len)); */
2019 * Now find the signature integer.
2021 pos
= 4+7; /* skip over "ssh-rsa" */
2022 siglen
= GET_32BIT(sigblob
+pos
);
2023 /* debug(("signature length is %d\n", siglen)); */
2025 if (len
!= siglen
) {
2026 unsigned char newlen
[4];
2027 ssh2_pkt_addstring_start(pkt
);
2028 ssh2_pkt_addstring_data(pkt
, (char *)sigblob
, pos
);
2029 /* dmemdump(sigblob, pos); */
2030 pos
+= 4; /* point to start of actual sig */
2031 PUT_32BIT(newlen
, len
);
2032 ssh2_pkt_addstring_data(pkt
, (char *)newlen
, 4);
2033 /* dmemdump(newlen, 4); */
2035 while (len
-- > siglen
) {
2036 ssh2_pkt_addstring_data(pkt
, (char *)newlen
, 1);
2037 /* dmemdump(newlen, 1); */
2039 ssh2_pkt_addstring_data(pkt
, (char *)(sigblob
+pos
), siglen
);
2040 /* dmemdump(sigblob+pos, siglen); */
2044 /* Otherwise fall through and do it the easy way. */
2047 ssh2_pkt_addstring_start(pkt
);
2048 ssh2_pkt_addstring_data(pkt
, (char *)sigblob
, sigblob_len
);
2052 * Examine the remote side's version string and compare it against
2053 * a list of known buggy implementations.
2055 static void ssh_detect_bugs(Ssh ssh
, char *vstring
)
2057 char *imp
; /* pointer to implementation part */
2059 imp
+= strcspn(imp
, "-");
2061 imp
+= strcspn(imp
, "-");
2064 ssh
->remote_bugs
= 0;
2066 if (ssh
->cfg
.sshbug_ignore1
== FORCE_ON
||
2067 (ssh
->cfg
.sshbug_ignore1
== AUTO
&&
2068 (!strcmp(imp
, "1.2.18") || !strcmp(imp
, "1.2.19") ||
2069 !strcmp(imp
, "1.2.20") || !strcmp(imp
, "1.2.21") ||
2070 !strcmp(imp
, "1.2.22") || !strcmp(imp
, "Cisco-1.25") ||
2071 !strcmp(imp
, "OSU_1.4alpha3") || !strcmp(imp
, "OSU_1.5alpha4")))) {
2073 * These versions don't support SSH1_MSG_IGNORE, so we have
2074 * to use a different defence against password length
2077 ssh
->remote_bugs
|= BUG_CHOKES_ON_SSH1_IGNORE
;
2078 logevent("We believe remote version has SSH1 ignore bug");
2081 if (ssh
->cfg
.sshbug_plainpw1
== FORCE_ON
||
2082 (ssh
->cfg
.sshbug_plainpw1
== AUTO
&&
2083 (!strcmp(imp
, "Cisco-1.25") || !strcmp(imp
, "OSU_1.4alpha3")))) {
2085 * These versions need a plain password sent; they can't
2086 * handle having a null and a random length of data after
2089 ssh
->remote_bugs
|= BUG_NEEDS_SSH1_PLAIN_PASSWORD
;
2090 logevent("We believe remote version needs a plain SSH1 password");
2093 if (ssh
->cfg
.sshbug_rsa1
== FORCE_ON
||
2094 (ssh
->cfg
.sshbug_rsa1
== AUTO
&&
2095 (!strcmp(imp
, "Cisco-1.25")))) {
2097 * These versions apparently have no clue whatever about
2098 * RSA authentication and will panic and die if they see
2099 * an AUTH_RSA message.
2101 ssh
->remote_bugs
|= BUG_CHOKES_ON_RSA
;
2102 logevent("We believe remote version can't handle RSA authentication");
2105 if (ssh
->cfg
.sshbug_hmac2
== FORCE_ON
||
2106 (ssh
->cfg
.sshbug_hmac2
== AUTO
&&
2107 !wc_match("* VShell", imp
) &&
2108 (wc_match("2.1.0*", imp
) || wc_match("2.0.*", imp
) ||
2109 wc_match("2.2.0*", imp
) || wc_match("2.3.0*", imp
) ||
2110 wc_match("2.1 *", imp
)))) {
2112 * These versions have the HMAC bug.
2114 ssh
->remote_bugs
|= BUG_SSH2_HMAC
;
2115 logevent("We believe remote version has SSH2 HMAC bug");
2118 if (ssh
->cfg
.sshbug_derivekey2
== FORCE_ON
||
2119 (ssh
->cfg
.sshbug_derivekey2
== AUTO
&&
2120 !wc_match("* VShell", imp
) &&
2121 (wc_match("2.0.0*", imp
) || wc_match("2.0.10*", imp
) ))) {
2123 * These versions have the key-derivation bug (failing to
2124 * include the literal shared secret in the hashes that
2125 * generate the keys).
2127 ssh
->remote_bugs
|= BUG_SSH2_DERIVEKEY
;
2128 logevent("We believe remote version has SSH2 key-derivation bug");
2131 if (ssh
->cfg
.sshbug_rsapad2
== FORCE_ON
||
2132 (ssh
->cfg
.sshbug_rsapad2
== AUTO
&&
2133 (wc_match("OpenSSH_2.[5-9]*", imp
) ||
2134 wc_match("OpenSSH_3.[0-2]*", imp
)))) {
2136 * These versions have the SSH2 RSA padding bug.
2138 ssh
->remote_bugs
|= BUG_SSH2_RSA_PADDING
;
2139 logevent("We believe remote version has SSH2 RSA padding bug");
2142 if (ssh
->cfg
.sshbug_pksessid2
== FORCE_ON
||
2143 (ssh
->cfg
.sshbug_pksessid2
== AUTO
&&
2144 wc_match("OpenSSH_2.[0-2]*", imp
))) {
2146 * These versions have the SSH2 session-ID bug in
2147 * public-key authentication.
2149 ssh
->remote_bugs
|= BUG_SSH2_PK_SESSIONID
;
2150 logevent("We believe remote version has SSH2 public-key-session-ID bug");
2153 if (ssh
->cfg
.sshbug_rekey2
== FORCE_ON
||
2154 (ssh
->cfg
.sshbug_rekey2
== AUTO
&&
2155 (wc_match("OpenSSH_2.[0-4]*", imp
) ||
2156 wc_match("OpenSSH_2.5.[0-3]*", imp
) ||
2157 wc_match("Sun_SSH_1.0", imp
) ||
2158 wc_match("Sun_SSH_1.0.1", imp
)))) {
2160 * These versions have the SSH2 rekey bug.
2162 ssh
->remote_bugs
|= BUG_SSH2_REKEY
;
2163 logevent("We believe remote version has SSH2 rekey bug");
2168 * The `software version' part of an SSH version string is required
2169 * to contain no spaces or minus signs.
2171 static void ssh_fix_verstring(char *str
)
2173 /* Eat "SSH-<protoversion>-". */
2174 assert(*str
== 'S'); str
++;
2175 assert(*str
== 'S'); str
++;
2176 assert(*str
== 'H'); str
++;
2177 assert(*str
== '-'); str
++;
2178 while (*str
&& *str
!= '-') str
++;
2179 assert(*str
== '-'); str
++;
2181 /* Convert minus signs and spaces in the remaining string into
2184 if (*str
== '-' || *str
== ' ')
2190 static int do_ssh_init(Ssh ssh
, unsigned char c
)
2192 struct do_ssh_init_state
{
2200 crState(do_ssh_init_state
);
2202 crBegin(ssh
->do_ssh_init_crstate
);
2204 /* Search for the string "SSH-" in the input. */
2207 static const int transS
[] = { 1, 2, 2, 1 };
2208 static const int transH
[] = { 0, 0, 3, 0 };
2209 static const int transminus
[] = { 0, 0, 0, -1 };
2211 s
->i
= transS
[s
->i
];
2213 s
->i
= transH
[s
->i
];
2215 s
->i
= transminus
[s
->i
];
2220 crReturn(1); /* get another character */
2224 s
->vstring
= snewn(s
->vstrsize
, char);
2225 strcpy(s
->vstring
, "SSH-");
2229 crReturn(1); /* get another char */
2230 if (s
->vslen
>= s
->vstrsize
- 1) {
2232 s
->vstring
= sresize(s
->vstring
, s
->vstrsize
, char);
2234 s
->vstring
[s
->vslen
++] = c
;
2237 s
->version
[s
->i
] = '\0';
2239 } else if (s
->i
< sizeof(s
->version
) - 1)
2240 s
->version
[s
->i
++] = c
;
2241 } else if (c
== '\012')
2245 ssh
->agentfwd_enabled
= FALSE
;
2246 ssh
->rdpkt2_state
.incoming_sequence
= 0;
2248 s
->vstring
[s
->vslen
] = 0;
2249 s
->vstring
[strcspn(s
->vstring
, "\015\012")] = '\0';/* remove EOL chars */
2250 logeventf(ssh
, "Server version: %s", s
->vstring
);
2251 ssh_detect_bugs(ssh
, s
->vstring
);
2254 * Decide which SSH protocol version to support.
2257 /* Anything strictly below "2.0" means protocol 1 is supported. */
2258 s
->proto1
= ssh_versioncmp(s
->version
, "2.0") < 0;
2259 /* Anything greater or equal to "1.99" means protocol 2 is supported. */
2260 s
->proto2
= ssh_versioncmp(s
->version
, "1.99") >= 0;
2262 if (ssh
->cfg
.sshprot
== 0 && !s
->proto1
) {
2263 bombout(("SSH protocol version 1 required by user but not provided by server"));
2266 if (ssh
->cfg
.sshprot
== 3 && !s
->proto2
) {
2267 bombout(("SSH protocol version 2 required by user but not provided by server"));
2274 if (s
->proto2
&& (ssh
->cfg
.sshprot
>= 2 || !s
->proto1
)) {
2276 * Construct a v2 version string.
2278 verstring
= dupprintf("SSH-2.0-%s\015\012", sshver
);
2282 * Construct a v1 version string.
2284 verstring
= dupprintf("SSH-%s-%s\012",
2285 (ssh_versioncmp(s
->version
, "1.5") <= 0 ?
2286 s
->version
: "1.5"),
2291 ssh_fix_verstring(verstring
);
2293 if (ssh
->version
== 2) {
2295 * Hash our version string and their version string.
2297 SHA_Init(&ssh
->exhashbase
);
2298 sha_string(&ssh
->exhashbase
, verstring
,
2299 strcspn(verstring
, "\015\012"));
2300 sha_string(&ssh
->exhashbase
, s
->vstring
,
2301 strcspn(s
->vstring
, "\015\012"));
2304 * Initialise SSHv2 protocol.
2306 ssh
->protocol
= ssh2_protocol
;
2307 ssh2_protocol_setup(ssh
);
2308 ssh
->s_rdpkt
= ssh2_rdpkt
;
2311 * Initialise SSHv1 protocol.
2313 ssh
->protocol
= ssh1_protocol
;
2314 ssh1_protocol_setup(ssh
);
2315 ssh
->s_rdpkt
= ssh1_rdpkt
;
2317 logeventf(ssh
, "We claim version: %.*s",
2318 strcspn(verstring
, "\015\012"), verstring
);
2319 sk_write(ssh
->s
, verstring
, strlen(verstring
));
2323 logeventf(ssh
, "Using SSH protocol version %d", ssh
->version
);
2325 update_specials_menu(ssh
->frontend
);
2326 ssh
->state
= SSH_STATE_BEFORE_SIZE
;
2327 ssh
->pinger
= pinger_new(&ssh
->cfg
, &ssh_backend
, ssh
);
2334 static void ssh_gotdata(Ssh ssh
, unsigned char *data
, int datalen
)
2336 crBegin(ssh
->ssh_gotdata_crstate
);
2339 * To begin with, feed the characters one by one to the
2340 * protocol initialisation / selection function do_ssh_init().
2341 * When that returns 0, we're done with the initial greeting
2342 * exchange and can move on to packet discipline.
2345 int ret
; /* need not be kept across crReturn */
2347 crReturnV
; /* more data please */
2348 ret
= do_ssh_init(ssh
, *data
);
2356 * We emerge from that loop when the initial negotiation is
2357 * over and we have selected an s_rdpkt function. Now pass
2358 * everything to s_rdpkt, and then pass the resulting packets
2359 * to the proper protocol handler.
2364 while (datalen
> 0) {
2365 struct Packet
*pktin
= ssh
->s_rdpkt(ssh
, &data
, &datalen
);
2367 ssh
->protocol(ssh
, NULL
, 0, pktin
);
2368 ssh_free_packet(pktin
);
2370 if (ssh
->state
== SSH_STATE_CLOSED
)
2378 static int ssh_do_close(Ssh ssh
, int notify_exit
)
2381 struct ssh_channel
*c
;
2383 ssh
->state
= SSH_STATE_CLOSED
;
2388 notify_remote_exit(ssh
->frontend
);
2393 * Now we must shut down any port and X forwardings going
2394 * through this connection.
2396 if (ssh
->channels
) {
2397 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
2400 x11_close(c
->u
.x11
.s
);
2403 pfd_close(c
->u
.pfd
.s
);
2406 del234(ssh
->channels
, c
);
2407 if (ssh
->version
== 2)
2408 bufchain_clear(&c
->v
.v2
.outbuffer
);
2416 static void ssh_log(Plug plug
, int type
, SockAddr addr
, int port
,
2417 const char *error_msg
, int error_code
)
2419 Ssh ssh
= (Ssh
) plug
;
2420 char addrbuf
[256], *msg
;
2422 sk_getaddr(addr
, addrbuf
, lenof(addrbuf
));
2425 msg
= dupprintf("Connecting to %s port %d", addrbuf
, port
);
2427 msg
= dupprintf("Failed to connect to %s: %s", addrbuf
, error_msg
);
2433 static int ssh_closing(Plug plug
, const char *error_msg
, int error_code
,
2436 Ssh ssh
= (Ssh
) plug
;
2437 int need_notify
= ssh_do_close(ssh
, FALSE
);
2439 if (!error_msg
&& !ssh
->close_expected
) {
2440 error_msg
= "Server unexpectedly closed network connection";
2444 /* A socket error has occurred. */
2445 logevent(error_msg
);
2446 connection_fatal(ssh
->frontend
, "%s", error_msg
);
2448 logevent("Server closed network connection");
2451 notify_remote_exit(ssh
->frontend
);
2455 static int ssh_receive(Plug plug
, int urgent
, char *data
, int len
)
2457 Ssh ssh
= (Ssh
) plug
;
2458 ssh_gotdata(ssh
, (unsigned char *)data
, len
);
2459 if (ssh
->state
== SSH_STATE_CLOSED
) {
2460 ssh_do_close(ssh
, TRUE
);
2466 static void ssh_sent(Plug plug
, int bufsize
)
2468 Ssh ssh
= (Ssh
) plug
;
2470 * If the send backlog on the SSH socket itself clears, we
2471 * should unthrottle the whole world if it was throttled.
2473 if (bufsize
< SSH_MAX_BACKLOG
)
2474 ssh_throttle_all(ssh
, 0, bufsize
);
2478 * Connect to specified host and port.
2479 * Returns an error message, or NULL on success.
2480 * Also places the canonical host name into `realhost'. It must be
2481 * freed by the caller.
2483 static const char *connect_to_host(Ssh ssh
, char *host
, int port
,
2484 char **realhost
, int nodelay
, int keepalive
)
2486 static const struct plug_function_table fn_table
= {
2497 ssh
->savedhost
= snewn(1 + strlen(host
), char);
2498 if (!ssh
->savedhost
)
2499 fatalbox("Out of memory");
2500 strcpy(ssh
->savedhost
, host
);
2503 port
= 22; /* default ssh port */
2504 ssh
->savedport
= port
;
2509 logeventf(ssh
, "Looking up host \"%s\"%s", host
,
2510 (ssh
->cfg
.addressfamily
== ADDRTYPE_IPV4 ?
" (IPv4)" :
2511 (ssh
->cfg
.addressfamily
== ADDRTYPE_IPV6 ?
" (IPv6)" : "")));
2512 addr
= name_lookup(host
, port
, realhost
, &ssh
->cfg
,
2513 ssh
->cfg
.addressfamily
);
2514 if ((err
= sk_addr_error(addr
)) != NULL
) {
2522 ssh
->fn
= &fn_table
;
2523 ssh
->s
= new_connection(addr
, *realhost
, port
,
2524 0, 1, nodelay
, keepalive
, (Plug
) ssh
, &ssh
->cfg
);
2525 if ((err
= sk_socket_error(ssh
->s
)) != NULL
) {
2527 notify_remote_exit(ssh
->frontend
);
2535 * Throttle or unthrottle the SSH connection.
2537 static void ssh1_throttle(Ssh ssh
, int adjust
)
2539 int old_count
= ssh
->v1_throttle_count
;
2540 ssh
->v1_throttle_count
+= adjust
;
2541 assert(ssh
->v1_throttle_count
>= 0);
2542 if (ssh
->v1_throttle_count
&& !old_count
) {
2543 sk_set_frozen(ssh
->s
, 1);
2544 } else if (!ssh
->v1_throttle_count
&& old_count
) {
2545 sk_set_frozen(ssh
->s
, 0);
2550 * Throttle or unthrottle _all_ local data streams (for when sends
2551 * on the SSH connection itself back up).
2553 static void ssh_throttle_all(Ssh ssh
, int enable
, int bufsize
)
2556 struct ssh_channel
*c
;
2558 if (enable
== ssh
->throttled_all
)
2560 ssh
->throttled_all
= enable
;
2561 ssh
->overall_bufsize
= bufsize
;
2564 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
2566 case CHAN_MAINSESSION
:
2568 * This is treated separately, outside the switch.
2572 x11_override_throttle(c
->u
.x11
.s
, enable
);
2575 /* Agent channels require no buffer management. */
2578 pfd_override_throttle(c
->u
.pfd
.s
, enable
);
2585 * Username and password input, abstracted off into routines
2586 * reusable in several places - even between SSH1 and SSH2.
2589 /* Set up a username or password input loop on a given buffer. */
2590 static void setup_userpass_input(Ssh ssh
, char *buffer
, int buflen
, int echo
)
2592 ssh
->userpass_input_buffer
= buffer
;
2593 ssh
->userpass_input_buflen
= buflen
;
2594 ssh
->userpass_input_bufpos
= 0;
2595 ssh
->userpass_input_echo
= echo
;
2599 * Process some terminal data in the course of username/password
2600 * input. Returns >0 for success (line of input returned in
2601 * buffer), <0 for failure (user hit ^C/^D, bomb out and exit), 0
2602 * for inconclusive (keep waiting for more input please).
2604 static int process_userpass_input(Ssh ssh
, unsigned char *in
, int inlen
)
2609 switch (c
= *in
++) {
2612 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
] = 0;
2613 ssh
->userpass_input_buffer
[ssh
->userpass_input_buflen
-1] = 0;
2618 if (ssh
->userpass_input_bufpos
> 0) {
2619 if (ssh
->userpass_input_echo
)
2620 c_write_str(ssh
, "\b \b");
2621 ssh
->userpass_input_bufpos
--;
2626 while (ssh
->userpass_input_bufpos
> 0) {
2627 if (ssh
->userpass_input_echo
)
2628 c_write_str(ssh
, "\b \b");
2629 ssh
->userpass_input_bufpos
--;
2638 * This simplistic check for printability is disabled
2639 * when we're doing password input, because some people
2640 * have control characters in their passwords.o
2642 if ((!ssh
->userpass_input_echo
||
2643 (c
>= ' ' && c
<= '~') ||
2644 ((unsigned char) c
>= 160))
2645 && ssh
->userpass_input_bufpos
< ssh
->userpass_input_buflen
-1) {
2646 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
++] = c
;
2647 if (ssh
->userpass_input_echo
)
2648 c_write(ssh
, &c
, 1);
2656 static void ssh_agent_callback(void *sshv
, void *reply
, int replylen
)
2658 Ssh ssh
= (Ssh
) sshv
;
2660 ssh
->agent_response
= reply
;
2661 ssh
->agent_response_len
= replylen
;
2663 if (ssh
->version
== 1)
2664 do_ssh1_login(ssh
, NULL
, -1, NULL
);
2666 do_ssh2_authconn(ssh
, NULL
, -1, NULL
);
2669 static void ssh_agentf_callback(void *cv
, void *reply
, int replylen
)
2671 struct ssh_channel
*c
= (struct ssh_channel
*)cv
;
2673 void *sentreply
= reply
;
2676 /* Fake SSH_AGENT_FAILURE. */
2677 sentreply
= "\0\0\0\1\5";
2680 if (ssh
->version
== 2) {
2681 ssh2_add_channel_data(c
, sentreply
, replylen
);
2684 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
2685 PKT_INT
, c
->remoteid
,
2688 PKT_DATA
, sentreply
, replylen
,
2697 * Handle the key exchange and user authentication phases.
2699 static int do_ssh1_login(Ssh ssh
, unsigned char *in
, int inlen
,
2700 struct Packet
*pktin
)
2703 unsigned char cookie
[8], *ptr
;
2704 struct RSAKey servkey
, hostkey
;
2705 struct MD5Context md5c
;
2706 struct do_ssh1_login_state
{
2708 unsigned char *rsabuf
, *keystr1
, *keystr2
;
2709 unsigned long supported_ciphers_mask
, supported_auths_mask
;
2710 int tried_publickey
, tried_agent
;
2711 int tis_auth_refused
, ccard_auth_refused
;
2712 unsigned char session_id
[16];
2715 void *publickey_blob
;
2716 int publickey_bloblen
;
2722 unsigned char request
[5], *response
, *p
;
2731 crState(do_ssh1_login_state
);
2733 crBegin(ssh
->do_ssh1_login_crstate
);
2738 if (pktin
->type
!= SSH1_SMSG_PUBLIC_KEY
) {
2739 bombout(("Public key packet not received"));
2743 logevent("Received public keys");
2745 ptr
= ssh_pkt_getdata(pktin
, 8);
2747 bombout(("SSH1 public key packet stopped before random cookie"));
2750 memcpy(cookie
, ptr
, 8);
2752 if (!ssh1_pkt_getrsakey(pktin
, &servkey
, &s
->keystr1
) ||
2753 !ssh1_pkt_getrsakey(pktin
, &hostkey
, &s
->keystr2
)) {
2754 bombout(("Failed to read SSH1 public keys from public key packet"));
2759 * Log the host key fingerprint.
2763 logevent("Host key fingerprint is:");
2764 strcpy(logmsg
, " ");
2765 hostkey
.comment
= NULL
;
2766 rsa_fingerprint(logmsg
+ strlen(logmsg
),
2767 sizeof(logmsg
) - strlen(logmsg
), &hostkey
);
2771 ssh
->v1_remote_protoflags
= ssh_pkt_getuint32(pktin
);
2772 s
->supported_ciphers_mask
= ssh_pkt_getuint32(pktin
);
2773 s
->supported_auths_mask
= ssh_pkt_getuint32(pktin
);
2775 ssh
->v1_local_protoflags
=
2776 ssh
->v1_remote_protoflags
& SSH1_PROTOFLAGS_SUPPORTED
;
2777 ssh
->v1_local_protoflags
|= SSH1_PROTOFLAG_SCREEN_NUMBER
;
2780 MD5Update(&md5c
, s
->keystr2
, hostkey
.bytes
);
2781 MD5Update(&md5c
, s
->keystr1
, servkey
.bytes
);
2782 MD5Update(&md5c
, cookie
, 8);
2783 MD5Final(s
->session_id
, &md5c
);
2785 for (i
= 0; i
< 32; i
++)
2786 ssh
->session_key
[i
] = random_byte();
2789 * Verify that the `bits' and `bytes' parameters match.
2791 if (hostkey
.bits
> hostkey
.bytes
* 8 ||
2792 servkey
.bits
> servkey
.bytes
* 8) {
2793 bombout(("SSH1 public keys were badly formatted"));
2797 s
->len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
2799 s
->rsabuf
= snewn(s
->len
, unsigned char);
2801 fatalbox("Out of memory");
2804 * Verify the host key.
2808 * First format the key into a string.
2810 int len
= rsastr_len(&hostkey
);
2811 char fingerprint
[100];
2812 char *keystr
= snewn(len
, char);
2814 fatalbox("Out of memory");
2815 rsastr_fmt(keystr
, &hostkey
);
2816 rsa_fingerprint(fingerprint
, sizeof(fingerprint
), &hostkey
);
2817 verify_ssh_host_key(ssh
->frontend
,
2818 ssh
->savedhost
, ssh
->savedport
, "rsa", keystr
,
2823 for (i
= 0; i
< 32; i
++) {
2824 s
->rsabuf
[i
] = ssh
->session_key
[i
];
2826 s
->rsabuf
[i
] ^= s
->session_id
[i
];
2829 if (hostkey
.bytes
> servkey
.bytes
) {
2830 ret
= rsaencrypt(s
->rsabuf
, 32, &servkey
);
2832 ret
= rsaencrypt(s
->rsabuf
, servkey
.bytes
, &hostkey
);
2834 ret
= rsaencrypt(s
->rsabuf
, 32, &hostkey
);
2836 ret
= rsaencrypt(s
->rsabuf
, hostkey
.bytes
, &servkey
);
2839 bombout(("SSH1 public key encryptions failed due to bad formatting"));
2843 logevent("Encrypted session key");
2846 int cipher_chosen
= 0, warn
= 0;
2847 char *cipher_string
= NULL
;
2849 for (i
= 0; !cipher_chosen
&& i
< CIPHER_MAX
; i
++) {
2850 int next_cipher
= ssh
->cfg
.ssh_cipherlist
[i
];
2851 if (next_cipher
== CIPHER_WARN
) {
2852 /* If/when we choose a cipher, warn about it */
2854 } else if (next_cipher
== CIPHER_AES
) {
2855 /* XXX Probably don't need to mention this. */
2856 logevent("AES not supported in SSH1, skipping");
2858 switch (next_cipher
) {
2859 case CIPHER_3DES
: s
->cipher_type
= SSH_CIPHER_3DES
;
2860 cipher_string
= "3DES"; break;
2861 case CIPHER_BLOWFISH
: s
->cipher_type
= SSH_CIPHER_BLOWFISH
;
2862 cipher_string
= "Blowfish"; break;
2863 case CIPHER_DES
: s
->cipher_type
= SSH_CIPHER_DES
;
2864 cipher_string
= "single-DES"; break;
2866 if (s
->supported_ciphers_mask
& (1 << s
->cipher_type
))
2870 if (!cipher_chosen
) {
2871 if ((s
->supported_ciphers_mask
& (1 << SSH_CIPHER_3DES
)) == 0)
2872 bombout(("Server violates SSH 1 protocol by not "
2873 "supporting 3DES encryption"));
2875 /* shouldn't happen */
2876 bombout(("No supported ciphers found"));
2880 /* Warn about chosen cipher if necessary. */
2882 sk_set_frozen(ssh
->s
, 1);
2883 askalg(ssh
->frontend
, "cipher", cipher_string
);
2884 sk_set_frozen(ssh
->s
, 0);
2888 switch (s
->cipher_type
) {
2889 case SSH_CIPHER_3DES
:
2890 logevent("Using 3DES encryption");
2892 case SSH_CIPHER_DES
:
2893 logevent("Using single-DES encryption");
2895 case SSH_CIPHER_BLOWFISH
:
2896 logevent("Using Blowfish encryption");
2900 send_packet(ssh
, SSH1_CMSG_SESSION_KEY
,
2901 PKT_CHAR
, s
->cipher_type
,
2902 PKT_DATA
, cookie
, 8,
2903 PKT_CHAR
, (s
->len
* 8) >> 8, PKT_CHAR
, (s
->len
* 8) & 0xFF,
2904 PKT_DATA
, s
->rsabuf
, s
->len
,
2905 PKT_INT
, ssh
->v1_local_protoflags
, PKT_END
);
2907 logevent("Trying to enable encryption...");
2911 ssh
->cipher
= (s
->cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish_ssh1
:
2912 s
->cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
2914 ssh
->v1_cipher_ctx
= ssh
->cipher
->make_context();
2915 ssh
->cipher
->sesskey(ssh
->v1_cipher_ctx
, ssh
->session_key
);
2916 logeventf(ssh
, "Initialised %s encryption", ssh
->cipher
->text_name
);
2918 ssh
->crcda_ctx
= crcda_make_context();
2919 logevent("Installing CRC compensation attack detector");
2921 if (servkey
.modulus
) {
2922 sfree(servkey
.modulus
);
2923 servkey
.modulus
= NULL
;
2925 if (servkey
.exponent
) {
2926 sfree(servkey
.exponent
);
2927 servkey
.exponent
= NULL
;
2929 if (hostkey
.modulus
) {
2930 sfree(hostkey
.modulus
);
2931 hostkey
.modulus
= NULL
;
2933 if (hostkey
.exponent
) {
2934 sfree(hostkey
.exponent
);
2935 hostkey
.exponent
= NULL
;
2939 if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
2940 bombout(("Encryption not successfully enabled"));
2944 logevent("Successfully started encryption");
2948 if (!*ssh
->cfg
.username
) {
2949 if (ssh_get_line
&& !ssh_getline_pw_only
) {
2950 if (!ssh_get_line("login as: ",
2951 s
->username
, sizeof(s
->username
), FALSE
)) {
2953 * get_line failed to get a username.
2956 logevent("No username provided. Abandoning session.");
2957 ssh
->close_expected
= TRUE
;
2958 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
2962 int ret
; /* need not be kept over crReturn */
2963 c_write_str(ssh
, "login as: ");
2966 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
2968 crWaitUntil(!pktin
);
2969 ret
= process_userpass_input(ssh
, in
, inlen
);
2973 c_write_str(ssh
, "\r\n");
2976 strncpy(s
->username
, ssh
->cfg
.username
, sizeof(s
->username
));
2977 s
->username
[sizeof(s
->username
)-1] = '\0';
2980 send_packet(ssh
, SSH1_CMSG_USER
, PKT_STR
, s
->username
, PKT_END
);
2982 char userlog
[22 + sizeof(s
->username
)];
2983 sprintf(userlog
, "Sent username \"%s\"", s
->username
);
2985 if (flags
& FLAG_INTERACTIVE
&&
2986 (!((flags
& FLAG_STDERR
) && (flags
& FLAG_VERBOSE
)))) {
2987 strcat(userlog
, "\r\n");
2988 c_write_str(ssh
, userlog
);
2995 if ((ssh
->remote_bugs
& BUG_CHOKES_ON_RSA
)) {
2996 /* We must not attempt PK auth. Pretend we've already tried it. */
2997 s
->tried_publickey
= s
->tried_agent
= 1;
2999 s
->tried_publickey
= s
->tried_agent
= 0;
3001 s
->tis_auth_refused
= s
->ccard_auth_refused
= 0;
3002 /* Load the public half of ssh->cfg.keyfile so we notice if it's in Pageant */
3003 if (!filename_is_null(ssh
->cfg
.keyfile
)) {
3004 if (!rsakey_pubblob(&ssh
->cfg
.keyfile
,
3005 &s
->publickey_blob
, &s
->publickey_bloblen
, NULL
))
3006 s
->publickey_blob
= NULL
;
3008 s
->publickey_blob
= NULL
;
3010 while (pktin
->type
== SSH1_SMSG_FAILURE
) {
3011 s
->pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
3013 if (agent_exists() && !s
->tried_agent
) {
3015 * Attempt RSA authentication using Pageant.
3021 logevent("Pageant is running. Requesting keys.");
3023 /* Request the keys held by the agent. */
3024 PUT_32BIT(s
->request
, 1);
3025 s
->request
[4] = SSH1_AGENTC_REQUEST_RSA_IDENTITIES
;
3026 if (!agent_query(s
->request
, 5, &r
, &s
->responselen
,
3027 ssh_agent_callback
, ssh
)) {
3031 bombout(("Unexpected data from server while waiting"
3032 " for agent response"));
3035 } while (pktin
|| inlen
> 0);
3036 r
= ssh
->agent_response
;
3037 s
->responselen
= ssh
->agent_response_len
;
3039 s
->response
= (unsigned char *) r
;
3040 if (s
->response
&& s
->responselen
>= 5 &&
3041 s
->response
[4] == SSH1_AGENT_RSA_IDENTITIES_ANSWER
) {
3042 s
->p
= s
->response
+ 5;
3043 s
->nkeys
= GET_32BIT(s
->p
);
3045 logeventf(ssh
, "Pageant has %d SSH1 keys", s
->nkeys
);
3046 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
3047 logeventf(ssh
, "Trying Pageant key #%d", s
->keyi
);
3048 if (s
->publickey_blob
&&
3049 !memcmp(s
->p
, s
->publickey_blob
,
3050 s
->publickey_bloblen
)) {
3051 logevent("This key matches configured key file");
3052 s
->tried_publickey
= 1;
3057 do { /* do while (0) to make breaking easy */
3058 n
= ssh1_read_bignum
3059 (s
->p
, s
->responselen
-(s
->p
-s
->response
),
3064 n
= ssh1_read_bignum
3065 (s
->p
, s
->responselen
-(s
->p
-s
->response
),
3070 if (s
->responselen
- (s
->p
-s
->response
) < 4)
3072 s
->commentlen
= GET_32BIT(s
->p
);
3074 if (s
->responselen
- (s
->p
-s
->response
) <
3077 s
->commentp
= (char *)s
->p
;
3078 s
->p
+= s
->commentlen
;
3082 logevent("Pageant key list packet was truncated");
3086 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
3087 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
3089 if (pktin
->type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
3090 logevent("Key refused");
3093 logevent("Received RSA challenge");
3094 if ((s
->challenge
= ssh1_pkt_getmp(pktin
)) == NULL
) {
3095 bombout(("Server's RSA challenge was badly formatted"));
3100 char *agentreq
, *q
, *ret
;
3103 len
= 1 + 4; /* message type, bit count */
3104 len
+= ssh1_bignum_length(s
->key
.exponent
);
3105 len
+= ssh1_bignum_length(s
->key
.modulus
);
3106 len
+= ssh1_bignum_length(s
->challenge
);
3107 len
+= 16; /* session id */
3108 len
+= 4; /* response format */
3109 agentreq
= snewn(4 + len
, char);
3110 PUT_32BIT(agentreq
, len
);
3112 *q
++ = SSH1_AGENTC_RSA_CHALLENGE
;
3113 PUT_32BIT(q
, bignum_bitcount(s
->key
.modulus
));
3115 q
+= ssh1_write_bignum(q
, s
->key
.exponent
);
3116 q
+= ssh1_write_bignum(q
, s
->key
.modulus
);
3117 q
+= ssh1_write_bignum(q
, s
->challenge
);
3118 memcpy(q
, s
->session_id
, 16);
3120 PUT_32BIT(q
, 1); /* response format */
3121 if (!agent_query(agentreq
, len
+ 4, &vret
, &retlen
,
3122 ssh_agent_callback
, ssh
)) {
3127 bombout(("Unexpected data from server"
3128 " while waiting for agent"
3132 } while (pktin
|| inlen
> 0);
3133 vret
= ssh
->agent_response
;
3134 retlen
= ssh
->agent_response_len
;
3139 if (ret
[4] == SSH1_AGENT_RSA_RESPONSE
) {
3140 logevent("Sending Pageant's response");
3141 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
3142 PKT_DATA
, ret
+ 5, 16,
3146 if (pktin
->type
== SSH1_SMSG_SUCCESS
) {
3148 ("Pageant's response accepted");
3149 if (flags
& FLAG_VERBOSE
) {
3150 c_write_str(ssh
, "Authenticated using"
3152 c_write(ssh
, s
->commentp
,
3154 c_write_str(ssh
, "\" from agent\r\n");
3159 ("Pageant's response not accepted");
3162 ("Pageant failed to answer challenge");
3166 logevent("No reply received from Pageant");
3169 freebn(s
->key
.exponent
);
3170 freebn(s
->key
.modulus
);
3171 freebn(s
->challenge
);
3180 if (!filename_is_null(ssh
->cfg
.keyfile
) && !s
->tried_publickey
)
3181 s
->pwpkt_type
= SSH1_CMSG_AUTH_RSA
;
3183 if (ssh
->cfg
.try_tis_auth
&&
3184 (s
->supported_auths_mask
& (1 << SSH1_AUTH_TIS
)) &&
3185 !s
->tis_auth_refused
) {
3186 s
->pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
3187 logevent("Requested TIS authentication");
3188 send_packet(ssh
, SSH1_CMSG_AUTH_TIS
, PKT_END
);
3190 if (pktin
->type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
3191 logevent("TIS authentication declined");
3192 if (flags
& FLAG_INTERACTIVE
)
3193 c_write_str(ssh
, "TIS authentication refused.\r\n");
3194 s
->tis_auth_refused
= 1;
3200 ssh_pkt_getstring(pktin
, &challenge
, &challengelen
);
3202 bombout(("TIS challenge packet was badly formed"));
3205 logevent("Received TIS challenge");
3206 if (challengelen
> sizeof(s
->prompt
) - 1)
3207 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
3208 memcpy(s
->prompt
, challenge
, challengelen
);
3209 /* Prompt heuristic comes from OpenSSH */
3210 strncpy(s
->prompt
+ challengelen
,
3211 memchr(s
->prompt
, '\n', challengelen
) ?
3212 "": "\r\nResponse: ",
3213 (sizeof s
->prompt
) - challengelen
);
3214 s
->prompt
[(sizeof s
->prompt
) - 1] = '\0';
3217 if (ssh
->cfg
.try_tis_auth
&&
3218 (s
->supported_auths_mask
& (1 << SSH1_AUTH_CCARD
)) &&
3219 !s
->ccard_auth_refused
) {
3220 s
->pwpkt_type
= SSH1_CMSG_AUTH_CCARD_RESPONSE
;
3221 logevent("Requested CryptoCard authentication");
3222 send_packet(ssh
, SSH1_CMSG_AUTH_CCARD
, PKT_END
);
3224 if (pktin
->type
!= SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
3225 logevent("CryptoCard authentication declined");
3226 c_write_str(ssh
, "CryptoCard authentication refused.\r\n");
3227 s
->ccard_auth_refused
= 1;
3233 ssh_pkt_getstring(pktin
, &challenge
, &challengelen
);
3235 bombout(("CryptoCard challenge packet was badly formed"));
3238 logevent("Received CryptoCard challenge");
3239 if (challengelen
> sizeof(s
->prompt
) - 1)
3240 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
3241 memcpy(s
->prompt
, challenge
, challengelen
);
3242 strncpy(s
->prompt
+ challengelen
,
3243 memchr(s
->prompt
, '\n', challengelen
) ?
3244 "" : "\r\nResponse: ",
3245 sizeof(s
->prompt
) - challengelen
);
3246 s
->prompt
[sizeof(s
->prompt
) - 1] = '\0';
3249 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
3250 sprintf(s
->prompt
, "%.90s@%.90s's password: ",
3251 s
->username
, ssh
->savedhost
);
3253 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
3254 char *comment
= NULL
;
3256 if (flags
& FLAG_VERBOSE
)
3257 c_write_str(ssh
, "Trying public key authentication.\r\n");
3258 logeventf(ssh
, "Trying public key \"%s\"",
3259 filename_to_str(&ssh
->cfg
.keyfile
));
3260 type
= key_type(&ssh
->cfg
.keyfile
);
3261 if (type
!= SSH_KEYTYPE_SSH1
) {
3262 char *msg
= dupprintf("Key is of wrong type (%s)",
3263 key_type_to_str(type
));
3265 c_write_str(ssh
, msg
);
3266 c_write_str(ssh
, "\r\n");
3268 s
->tried_publickey
= 1;
3271 if (!rsakey_encrypted(&ssh
->cfg
.keyfile
, &comment
)) {
3272 if (flags
& FLAG_VERBOSE
)
3273 c_write_str(ssh
, "No passphrase required.\r\n");
3276 sprintf(s
->prompt
, "Passphrase for key \"%.100s\": ", comment
);
3281 * Show password prompt, having first obtained it via a TIS
3282 * or CryptoCard exchange if we're doing TIS or CryptoCard
3286 if (!ssh_get_line(s
->prompt
, s
->password
,
3287 sizeof(s
->password
), TRUE
)) {
3289 * get_line failed to get a password (for example
3290 * because one was supplied on the command line
3291 * which has already failed to work). Terminate.
3293 send_packet(ssh
, SSH1_MSG_DISCONNECT
,
3294 PKT_STR
, "No more passwords available to try",
3296 logevent("Unable to authenticate");
3297 connection_fatal(ssh
->frontend
, "Unable to authenticate");
3298 ssh
->close_expected
= TRUE
;
3299 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
3303 /* Prompt may have come from server. We've munged it a bit, so
3304 * we know it to be zero-terminated at least once. */
3305 int ret
; /* need not be saved over crReturn */
3306 c_write_untrusted(ssh
, s
->prompt
, strlen(s
->prompt
));
3309 setup_userpass_input(ssh
, s
->password
, sizeof(s
->password
), 0);
3311 crWaitUntil(!pktin
);
3312 ret
= process_userpass_input(ssh
, in
, inlen
);
3316 c_write_str(ssh
, "\r\n");
3320 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
3322 * Try public key authentication with the specified
3325 s
->tried_publickey
= 1;
3328 const char *error
= NULL
;
3329 int ret
= loadrsakey(&ssh
->cfg
.keyfile
, &s
->key
, s
->password
,
3332 c_write_str(ssh
, "Couldn't load private key from ");
3333 c_write_str(ssh
, filename_to_str(&ssh
->cfg
.keyfile
));
3334 c_write_str(ssh
, " (");
3335 c_write_str(ssh
, error
);
3336 c_write_str(ssh
, ").\r\n");
3337 continue; /* go and try password */
3340 c_write_str(ssh
, "Wrong passphrase.\r\n");
3341 s
->tried_publickey
= 0;
3342 continue; /* try again */
3347 * Send a public key attempt.
3349 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
3350 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
3353 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3354 c_write_str(ssh
, "Server refused our public key.\r\n");
3355 continue; /* go and try password */
3357 if (pktin
->type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
3358 bombout(("Bizarre response to offer of public key"));
3364 unsigned char buffer
[32];
3365 Bignum challenge
, response
;
3367 if ((challenge
= ssh1_pkt_getmp(pktin
)) == NULL
) {
3368 bombout(("Server's RSA challenge was badly formatted"));
3371 response
= rsadecrypt(challenge
, &s
->key
);
3372 freebn(s
->key
.private_exponent
);/* burn the evidence */
3374 for (i
= 0; i
< 32; i
++) {
3375 buffer
[i
] = bignum_byte(response
, 31 - i
);
3379 MD5Update(&md5c
, buffer
, 32);
3380 MD5Update(&md5c
, s
->session_id
, 16);
3381 MD5Final(buffer
, &md5c
);
3383 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
3384 PKT_DATA
, buffer
, 16, PKT_END
);
3391 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3392 if (flags
& FLAG_VERBOSE
)
3393 c_write_str(ssh
, "Failed to authenticate with"
3394 " our public key.\r\n");
3395 continue; /* go and try password */
3396 } else if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
3397 bombout(("Bizarre response to RSA authentication response"));
3401 break; /* we're through! */
3403 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
3405 * Defence against traffic analysis: we send a
3406 * whole bunch of packets containing strings of
3407 * different lengths. One of these strings is the
3408 * password, in a SSH1_CMSG_AUTH_PASSWORD packet.
3409 * The others are all random data in
3410 * SSH1_MSG_IGNORE packets. This way a passive
3411 * listener can't tell which is the password, and
3412 * hence can't deduce the password length.
3414 * Anybody with a password length greater than 16
3415 * bytes is going to have enough entropy in their
3416 * password that a listener won't find it _that_
3417 * much help to know how long it is. So what we'll
3420 * - if password length < 16, we send 15 packets
3421 * containing string lengths 1 through 15
3423 * - otherwise, we let N be the nearest multiple
3424 * of 8 below the password length, and send 8
3425 * packets containing string lengths N through
3426 * N+7. This won't obscure the order of
3427 * magnitude of the password length, but it will
3428 * introduce a bit of extra uncertainty.
3430 * A few servers (the old 1.2.18 through 1.2.22)
3431 * can't deal with SSH1_MSG_IGNORE. For these
3432 * servers, we need an alternative defence. We make
3433 * use of the fact that the password is interpreted
3434 * as a C string: so we can append a NUL, then some
3437 * One server (a Cisco one) can deal with neither
3438 * SSH1_MSG_IGNORE _nor_ a padded password string.
3439 * For this server we are left with no defences
3440 * against password length sniffing.
3442 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
)) {
3444 * The server can deal with SSH1_MSG_IGNORE, so
3445 * we can use the primary defence.
3447 int bottom
, top
, pwlen
, i
;
3450 pwlen
= strlen(s
->password
);
3452 bottom
= 0; /* zero length passwords are OK! :-) */
3455 bottom
= pwlen
& ~7;
3459 assert(pwlen
>= bottom
&& pwlen
<= top
);
3461 randomstr
= snewn(top
+ 1, char);
3463 for (i
= bottom
; i
<= top
; i
++) {
3465 defer_packet(ssh
, s
->pwpkt_type
,
3466 PKTT_PASSWORD
, PKT_STR
, s
->password
,
3467 PKTT_OTHER
, PKT_END
);
3469 for (j
= 0; j
< i
; j
++) {
3471 randomstr
[j
] = random_byte();
3472 } while (randomstr
[j
] == '\0');
3474 randomstr
[i
] = '\0';
3475 defer_packet(ssh
, SSH1_MSG_IGNORE
,
3476 PKT_STR
, randomstr
, PKT_END
);
3479 logevent("Sending password with camouflage packets");
3480 ssh_pkt_defersend(ssh
);
3483 else if (!(ssh
->remote_bugs
& BUG_NEEDS_SSH1_PLAIN_PASSWORD
)) {
3485 * The server can't deal with SSH1_MSG_IGNORE
3486 * but can deal with padded passwords, so we
3487 * can use the secondary defence.
3493 len
= strlen(s
->password
);
3494 if (len
< sizeof(string
)) {
3496 strcpy(string
, s
->password
);
3497 len
++; /* cover the zero byte */
3498 while (len
< sizeof(string
)) {
3499 string
[len
++] = (char) random_byte();
3504 logevent("Sending length-padded password");
3505 send_packet(ssh
, s
->pwpkt_type
, PKTT_PASSWORD
,
3506 PKT_INT
, len
, PKT_DATA
, ss
, len
,
3507 PKTT_OTHER
, PKT_END
);
3510 * The server has _both_
3511 * BUG_CHOKES_ON_SSH1_IGNORE and
3512 * BUG_NEEDS_SSH1_PLAIN_PASSWORD. There is
3513 * therefore nothing we can do.
3516 len
= strlen(s
->password
);
3517 logevent("Sending unpadded password");
3518 send_packet(ssh
, s
->pwpkt_type
,
3519 PKTT_PASSWORD
, PKT_INT
, len
,
3520 PKT_DATA
, s
->password
, len
,
3521 PKTT_OTHER
, PKT_END
);
3524 send_packet(ssh
, s
->pwpkt_type
, PKTT_PASSWORD
,
3525 PKT_STR
, s
->password
, PKTT_OTHER
, PKT_END
);
3528 logevent("Sent password");
3529 memset(s
->password
, 0, strlen(s
->password
));
3531 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3532 if (flags
& FLAG_VERBOSE
)
3533 c_write_str(ssh
, "Access denied\r\n");
3534 logevent("Authentication refused");
3535 } else if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
3536 bombout(("Strange packet received, type %d", pktin
->type
));
3541 logevent("Authentication successful");
3546 void sshfwd_close(struct ssh_channel
*c
)
3550 if (ssh
->state
!= SSH_STATE_SESSION
) {
3551 assert(ssh
->state
== SSH_STATE_CLOSED
);
3555 if (c
&& !c
->closes
) {
3557 * If halfopen is true, we have sent
3558 * CHANNEL_OPEN for this channel, but it hasn't even been
3559 * acknowledged by the server. So we must set a close flag
3560 * on it now, and then when the server acks the channel
3561 * open, we can close it then.
3564 if (ssh
->version
== 1) {
3565 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
, PKT_INT
, c
->remoteid
,
3568 struct Packet
*pktout
;
3569 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
3570 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
3571 ssh2_pkt_send(ssh
, pktout
);
3574 c
->closes
= 1; /* sent MSG_CLOSE */
3575 if (c
->type
== CHAN_X11
) {
3577 logevent("Forwarded X11 connection terminated");
3578 } else if (c
->type
== CHAN_SOCKDATA
||
3579 c
->type
== CHAN_SOCKDATA_DORMANT
) {
3581 logevent("Forwarded port closed");
3586 int sshfwd_write(struct ssh_channel
*c
, char *buf
, int len
)
3590 if (ssh
->state
!= SSH_STATE_SESSION
) {
3591 assert(ssh
->state
== SSH_STATE_CLOSED
);
3595 if (ssh
->version
== 1) {
3596 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
3597 PKT_INT
, c
->remoteid
,
3599 PKT_INT
, len
, PKT_DATA
, buf
, len
,
3600 PKTT_OTHER
, PKT_END
);
3602 * In SSH1 we can return 0 here - implying that forwarded
3603 * connections are never individually throttled - because
3604 * the only circumstance that can cause throttling will be
3605 * the whole SSH connection backing up, in which case
3606 * _everything_ will be throttled as a whole.
3610 ssh2_add_channel_data(c
, buf
, len
);
3611 return ssh2_try_send(c
);
3615 void sshfwd_unthrottle(struct ssh_channel
*c
, int bufsize
)
3619 if (ssh
->state
!= SSH_STATE_SESSION
) {
3620 assert(ssh
->state
== SSH_STATE_CLOSED
);
3624 if (ssh
->version
== 1) {
3625 if (c
->v
.v1
.throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
3626 c
->v
.v1
.throttling
= 0;
3627 ssh1_throttle(ssh
, -1);
3630 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
3634 static void ssh_queueing_handler(Ssh ssh
, struct Packet
*pktin
)
3636 struct queued_handler
*qh
= ssh
->qhead
;
3640 assert(pktin
->type
== qh
->msg1
|| pktin
->type
== qh
->msg2
);
3643 assert(ssh
->packet_dispatch
[qh
->msg1
] == ssh_queueing_handler
);
3644 ssh
->packet_dispatch
[qh
->msg1
] = NULL
;
3647 assert(ssh
->packet_dispatch
[qh
->msg2
] == ssh_queueing_handler
);
3648 ssh
->packet_dispatch
[qh
->msg2
] = NULL
;
3652 ssh
->qhead
= qh
->next
;
3654 if (ssh
->qhead
->msg1
> 0) {
3655 assert(ssh
->packet_dispatch
[ssh
->qhead
->msg1
] == NULL
);
3656 ssh
->packet_dispatch
[ssh
->qhead
->msg1
] = ssh_queueing_handler
;
3658 if (ssh
->qhead
->msg2
> 0) {
3659 assert(ssh
->packet_dispatch
[ssh
->qhead
->msg2
] == NULL
);
3660 ssh
->packet_dispatch
[ssh
->qhead
->msg2
] = ssh_queueing_handler
;
3663 ssh
->qhead
= ssh
->qtail
= NULL
;
3664 ssh
->packet_dispatch
[pktin
->type
] = NULL
;
3667 qh
->handler(ssh
, pktin
, qh
->ctx
);
3672 static void ssh_queue_handler(Ssh ssh
, int msg1
, int msg2
,
3673 chandler_fn_t handler
, void *ctx
)
3675 struct queued_handler
*qh
;
3677 qh
= snew(struct queued_handler
);
3680 qh
->handler
= handler
;
3684 if (ssh
->qtail
== NULL
) {
3688 assert(ssh
->packet_dispatch
[qh
->msg1
] == NULL
);
3689 ssh
->packet_dispatch
[qh
->msg1
] = ssh_queueing_handler
;
3692 assert(ssh
->packet_dispatch
[qh
->msg2
] == NULL
);
3693 ssh
->packet_dispatch
[qh
->msg2
] = ssh_queueing_handler
;
3696 ssh
->qtail
->next
= qh
;
3701 static void ssh_rportfwd_succfail(Ssh ssh
, struct Packet
*pktin
, void *ctx
)
3703 struct ssh_rportfwd
*rpf
, *pf
= (struct ssh_rportfwd
*)ctx
;
3705 if (pktin
->type
== (ssh
->version
== 1 ? SSH1_SMSG_SUCCESS
:
3706 SSH2_MSG_REQUEST_SUCCESS
)) {
3707 logeventf(ssh
, "Remote port forwarding from %s enabled",
3710 logeventf(ssh
, "Remote port forwarding from %s refused",
3713 rpf
= del234(ssh
->rportfwds
, pf
);
3719 static void ssh_setup_portfwd(Ssh ssh
, const Config
*cfg
)
3721 const char *portfwd_strptr
= cfg
->portfwd
;
3722 struct ssh_portfwd
*epf
;
3725 if (!ssh
->portfwds
) {
3726 ssh
->portfwds
= newtree234(ssh_portcmp
);
3729 * Go through the existing port forwardings and tag them
3730 * with status==DESTROY. Any that we want to keep will be
3731 * re-enabled (status==KEEP) as we go through the
3732 * configuration and find out which bits are the same as
3735 struct ssh_portfwd
*epf
;
3737 for (i
= 0; (epf
= index234(ssh
->portfwds
, i
)) != NULL
; i
++)
3738 epf
->status
= DESTROY
;
3741 while (*portfwd_strptr
) {
3742 char address_family
, type
;
3743 int sport
,dport
,sserv
,dserv
;
3744 char sports
[256], dports
[256], saddr
[256], host
[256];
3747 address_family
= 'A';
3749 if (*portfwd_strptr
== 'A' ||
3750 *portfwd_strptr
== '4' ||
3751 *portfwd_strptr
== '6')
3752 address_family
= *portfwd_strptr
++;
3753 if (*portfwd_strptr
== 'L' ||
3754 *portfwd_strptr
== 'R' ||
3755 *portfwd_strptr
== 'D')
3756 type
= *portfwd_strptr
++;
3761 while (*portfwd_strptr
&& *portfwd_strptr
!= '\t') {
3762 if (*portfwd_strptr
== ':') {
3764 * We've seen a colon in the middle of the
3765 * source port number. This means that
3766 * everything we've seen until now is the
3767 * source _address_, so we'll move it into
3768 * saddr and start sports from the beginning
3773 if (ssh
->version
== 1 && type
== 'R') {
3774 logeventf(ssh
, "SSH1 cannot handle remote source address "
3775 "spec \"%s\"; ignoring", sports
);
3777 strcpy(saddr
, sports
);
3780 if (n
< 255) sports
[n
++] = *portfwd_strptr
++;
3784 if (*portfwd_strptr
== '\t')
3787 while (*portfwd_strptr
&& *portfwd_strptr
!= ':') {
3788 if (n
< 255) host
[n
++] = *portfwd_strptr
++;
3791 if (*portfwd_strptr
== ':')
3794 while (*portfwd_strptr
) {
3795 if (n
< 255) dports
[n
++] = *portfwd_strptr
++;
3799 dport
= atoi(dports
);
3803 dport
= net_service_lookup(dports
);
3805 logeventf(ssh
, "Service lookup failed for destination"
3806 " port \"%s\"", dports
);
3810 while (*portfwd_strptr
) portfwd_strptr
++;
3812 portfwd_strptr
++; /* eat the NUL and move to next one */
3814 sport
= atoi(sports
);
3818 sport
= net_service_lookup(sports
);
3820 logeventf(ssh
, "Service lookup failed for source"
3821 " port \"%s\"", sports
);
3824 if (sport
&& dport
) {
3825 /* Set up a description of the source port. */
3826 struct ssh_portfwd
*pfrec
, *epfrec
;
3828 pfrec
= snew(struct ssh_portfwd
);
3830 pfrec
->saddr
= *saddr ?
dupstr(saddr
) : NULL
;
3831 pfrec
->sserv
= sserv ?
dupstr(sports
) : NULL
;
3832 pfrec
->sport
= sport
;
3833 pfrec
->daddr
= *host ?
dupstr(host
) : NULL
;
3834 pfrec
->dserv
= dserv ?
dupstr(dports
) : NULL
;
3835 pfrec
->dport
= dport
;
3836 pfrec
->local
= NULL
;
3837 pfrec
->remote
= NULL
;
3838 pfrec
->addressfamily
= (address_family
== '4' ? ADDRTYPE_IPV4
:
3839 address_family
== '6' ? ADDRTYPE_IPV6
:
3842 epfrec
= add234(ssh
->portfwds
, pfrec
);
3843 if (epfrec
!= pfrec
) {
3845 * We already have a port forwarding with precisely
3846 * these parameters. Hence, no need to do anything;
3847 * simply tag the existing one as KEEP.
3849 epfrec
->status
= KEEP
;
3850 free_portfwd(pfrec
);
3852 pfrec
->status
= CREATE
;
3858 * Now go through and destroy any port forwardings which were
3861 for (i
= 0; (epf
= index234(ssh
->portfwds
, i
)) != NULL
; i
++)
3862 if (epf
->status
== DESTROY
) {
3865 message
= dupprintf("%s port forwarding from %s%s%d",
3866 epf
->type
== 'L' ?
"local" :
3867 epf
->type
== 'R' ?
"remote" : "dynamic",
3868 epf
->saddr ? epf
->saddr
: "",
3869 epf
->saddr ?
":" : "",
3872 if (epf
->type
!= 'D') {
3873 char *msg2
= dupprintf("%s to %s:%d", message
,
3874 epf
->daddr
, epf
->dport
);
3879 logeventf(ssh
, "Cancelling %s", message
);
3883 struct ssh_rportfwd
*rpf
= epf
->remote
;
3884 struct Packet
*pktout
;
3887 * Cancel the port forwarding at the server
3890 if (ssh
->version
== 1) {
3892 * We cannot cancel listening ports on the
3893 * server side in SSH1! There's no message
3894 * to support it. Instead, we simply remove
3895 * the rportfwd record from the local end
3896 * so that any connections the server tries
3897 * to make on it are rejected.
3900 pktout
= ssh2_pkt_init(SSH2_MSG_GLOBAL_REQUEST
);
3901 ssh2_pkt_addstring(pktout
, "cancel-tcpip-forward");
3902 ssh2_pkt_addbool(pktout
, 0);/* _don't_ want reply */
3904 ssh2_pkt_addstring(pktout
, epf
->saddr
);
3905 } else if (ssh
->cfg
.rport_acceptall
) {
3906 ssh2_pkt_addstring(pktout
, "0.0.0.0");
3908 ssh2_pkt_addstring(pktout
, "127.0.0.1");
3910 ssh2_pkt_adduint32(pktout
, epf
->sport
);
3911 ssh2_pkt_send(ssh
, pktout
);
3914 del234(ssh
->rportfwds
, rpf
);
3916 } else if (epf
->local
) {
3917 pfd_terminate(epf
->local
);
3920 delpos234(ssh
->portfwds
, i
);
3922 i
--; /* so we don't skip one in the list */
3926 * And finally, set up any new port forwardings (status==CREATE).
3928 for (i
= 0; (epf
= index234(ssh
->portfwds
, i
)) != NULL
; i
++)
3929 if (epf
->status
== CREATE
) {
3930 char *sportdesc
, *dportdesc
;
3931 sportdesc
= dupprintf("%s%s%s%s%d%s",
3932 epf
->saddr ? epf
->saddr
: "",
3933 epf
->saddr ?
":" : "",
3934 epf
->sserv ? epf
->sserv
: "",
3935 epf
->sserv ?
"(" : "",
3937 epf
->sserv ?
")" : "");
3938 if (epf
->type
== 'D') {
3941 dportdesc
= dupprintf("%s:%s%s%d%s",
3943 epf
->dserv ? epf
->dserv
: "",
3944 epf
->dserv ?
"(" : "",
3946 epf
->dserv ?
")" : "");
3949 if (epf
->type
== 'L') {
3950 const char *err
= pfd_addforward(epf
->daddr
, epf
->dport
,
3951 epf
->saddr
, epf
->sport
,
3954 epf
->addressfamily
);
3956 logeventf(ssh
, "Local %sport %s forwarding to %s%s%s",
3957 epf
->addressfamily
== ADDRTYPE_IPV4 ?
"IPv4 " :
3958 epf
->addressfamily
== ADDRTYPE_IPV6 ?
"IPv6 " : "",
3959 sportdesc
, dportdesc
,
3960 err ?
" failed: " : "", err ? err
: "");
3961 } else if (epf
->type
== 'D') {
3962 const char *err
= pfd_addforward(NULL
, -1,
3963 epf
->saddr
, epf
->sport
,
3966 epf
->addressfamily
);
3968 logeventf(ssh
, "Local %sport %s SOCKS dynamic forwarding%s%s",
3969 epf
->addressfamily
== ADDRTYPE_IPV4 ?
"IPv4 " :
3970 epf
->addressfamily
== ADDRTYPE_IPV6 ?
"IPv6 " : "",
3972 err ?
" failed: " : "", err ? err
: "");
3974 struct ssh_rportfwd
*pf
;
3977 * Ensure the remote port forwardings tree exists.
3979 if (!ssh
->rportfwds
) {
3980 if (ssh
->version
== 1)
3981 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh1
);
3983 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh2
);
3986 pf
= snew(struct ssh_rportfwd
);
3987 strncpy(pf
->dhost
, epf
->daddr
, lenof(pf
->dhost
)-1);
3988 pf
->dhost
[lenof(pf
->dhost
)-1] = '\0';
3989 pf
->dport
= epf
->dport
;
3990 pf
->sport
= epf
->sport
;
3991 if (add234(ssh
->rportfwds
, pf
) != pf
) {
3992 logeventf(ssh
, "Duplicate remote port forwarding to %s:%d",
3993 epf
->daddr
, epf
->dport
);
3996 logeventf(ssh
, "Requesting remote port %s"
3997 " forward to %s", sportdesc
, dportdesc
);
3999 pf
->sportdesc
= sportdesc
;
4004 if (ssh
->version
== 1) {
4005 send_packet(ssh
, SSH1_CMSG_PORT_FORWARD_REQUEST
,
4006 PKT_INT
, epf
->sport
,
4007 PKT_STR
, epf
->daddr
,
4008 PKT_INT
, epf
->dport
,
4010 ssh_queue_handler(ssh
, SSH1_SMSG_SUCCESS
,
4012 ssh_rportfwd_succfail
, pf
);
4014 struct Packet
*pktout
;
4015 pktout
= ssh2_pkt_init(SSH2_MSG_GLOBAL_REQUEST
);
4016 ssh2_pkt_addstring(pktout
, "tcpip-forward");
4017 ssh2_pkt_addbool(pktout
, 1);/* want reply */
4019 ssh2_pkt_addstring(pktout
, epf
->saddr
);
4020 } else if (ssh
->cfg
.rport_acceptall
) {
4021 ssh2_pkt_addstring(pktout
, "0.0.0.0");
4023 ssh2_pkt_addstring(pktout
, "127.0.0.1");
4025 ssh2_pkt_adduint32(pktout
, epf
->sport
);
4026 ssh2_pkt_send(ssh
, pktout
);
4028 ssh_queue_handler(ssh
, SSH2_MSG_REQUEST_SUCCESS
,
4029 SSH2_MSG_REQUEST_FAILURE
,
4030 ssh_rportfwd_succfail
, pf
);
4039 static void ssh1_smsg_stdout_stderr_data(Ssh ssh
, struct Packet
*pktin
)
4042 int stringlen
, bufsize
;
4044 ssh_pkt_getstring(pktin
, &string
, &stringlen
);
4045 if (string
== NULL
) {
4046 bombout(("Incoming terminal data packet was badly formed"));
4050 bufsize
= from_backend(ssh
->frontend
, pktin
->type
== SSH1_SMSG_STDERR_DATA
,
4052 if (!ssh
->v1_stdout_throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
4053 ssh
->v1_stdout_throttling
= 1;
4054 ssh1_throttle(ssh
, +1);
4058 static void ssh1_smsg_x11_open(Ssh ssh
, struct Packet
*pktin
)
4060 /* Remote side is trying to open a channel to talk to our
4061 * X-Server. Give them back a local channel number. */
4062 struct ssh_channel
*c
;
4063 int remoteid
= ssh_pkt_getuint32(pktin
);
4065 logevent("Received X11 connect request");
4066 /* Refuse if X11 forwarding is disabled. */
4067 if (!ssh
->X11_fwd_enabled
) {
4068 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4069 PKT_INT
, remoteid
, PKT_END
);
4070 logevent("Rejected X11 connect request");
4072 c
= snew(struct ssh_channel
);
4075 if (x11_init(&c
->u
.x11
.s
, ssh
->cfg
.x11_display
, c
,
4076 ssh
->x11auth
, NULL
, -1, &ssh
->cfg
) != NULL
) {
4077 logevent("Opening X11 forward connection failed");
4079 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4080 PKT_INT
, remoteid
, PKT_END
);
4083 ("Opening X11 forward connection succeeded");
4084 c
->remoteid
= remoteid
;
4085 c
->halfopen
= FALSE
;
4086 c
->localid
= alloc_channel_id(ssh
);
4088 c
->v
.v1
.throttling
= 0;
4089 c
->type
= CHAN_X11
; /* identify channel type */
4090 add234(ssh
->channels
, c
);
4091 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
4092 PKT_INT
, c
->remoteid
, PKT_INT
,
4093 c
->localid
, PKT_END
);
4094 logevent("Opened X11 forward channel");
4099 static void ssh1_smsg_agent_open(Ssh ssh
, struct Packet
*pktin
)
4101 /* Remote side is trying to open a channel to talk to our
4102 * agent. Give them back a local channel number. */
4103 struct ssh_channel
*c
;
4104 int remoteid
= ssh_pkt_getuint32(pktin
);
4106 /* Refuse if agent forwarding is disabled. */
4107 if (!ssh
->agentfwd_enabled
) {
4108 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4109 PKT_INT
, remoteid
, PKT_END
);
4111 c
= snew(struct ssh_channel
);
4113 c
->remoteid
= remoteid
;
4114 c
->halfopen
= FALSE
;
4115 c
->localid
= alloc_channel_id(ssh
);
4117 c
->v
.v1
.throttling
= 0;
4118 c
->type
= CHAN_AGENT
; /* identify channel type */
4119 c
->u
.a
.lensofar
= 0;
4120 add234(ssh
->channels
, c
);
4121 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
4122 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
4127 static void ssh1_msg_port_open(Ssh ssh
, struct Packet
*pktin
)
4129 /* Remote side is trying to open a channel to talk to a
4130 * forwarded port. Give them back a local channel number. */
4131 struct ssh_channel
*c
;
4132 struct ssh_rportfwd pf
, *pfp
;
4137 c
= snew(struct ssh_channel
);
4140 remoteid
= ssh_pkt_getuint32(pktin
);
4141 ssh_pkt_getstring(pktin
, &host
, &hostsize
);
4142 port
= ssh_pkt_getuint32(pktin
);
4144 if (hostsize
>= lenof(pf
.dhost
))
4145 hostsize
= lenof(pf
.dhost
)-1;
4146 memcpy(pf
.dhost
, host
, hostsize
);
4147 pf
.dhost
[hostsize
] = '\0';
4149 pfp
= find234(ssh
->rportfwds
, &pf
, NULL
);
4152 logeventf(ssh
, "Rejected remote port open request for %s:%d",
4154 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4155 PKT_INT
, remoteid
, PKT_END
);
4157 logeventf(ssh
, "Received remote port open request for %s:%d",
4159 e
= pfd_newconnect(&c
->u
.pfd
.s
, pf
.dhost
, port
,
4160 c
, &ssh
->cfg
, pfp
->pfrec
->addressfamily
);
4162 logeventf(ssh
, "Port open failed: %s", e
);
4164 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4165 PKT_INT
, remoteid
, PKT_END
);
4167 c
->remoteid
= remoteid
;
4168 c
->halfopen
= FALSE
;
4169 c
->localid
= alloc_channel_id(ssh
);
4171 c
->v
.v1
.throttling
= 0;
4172 c
->type
= CHAN_SOCKDATA
; /* identify channel type */
4173 add234(ssh
->channels
, c
);
4174 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
4175 PKT_INT
, c
->remoteid
, PKT_INT
,
4176 c
->localid
, PKT_END
);
4177 logevent("Forwarded port opened successfully");
4182 static void ssh1_msg_channel_open_confirmation(Ssh ssh
, struct Packet
*pktin
)
4184 unsigned int remoteid
= ssh_pkt_getuint32(pktin
);
4185 unsigned int localid
= ssh_pkt_getuint32(pktin
);
4186 struct ssh_channel
*c
;
4188 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
4189 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
4190 c
->remoteid
= localid
;
4191 c
->halfopen
= FALSE
;
4192 c
->type
= CHAN_SOCKDATA
;
4193 c
->v
.v1
.throttling
= 0;
4194 pfd_confirm(c
->u
.pfd
.s
);
4197 if (c
&& c
->closes
) {
4199 * We have a pending close on this channel,
4200 * which we decided on before the server acked
4201 * the channel open. So now we know the
4202 * remoteid, we can close it again.
4204 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
,
4205 PKT_INT
, c
->remoteid
, PKT_END
);
4209 static void ssh1_msg_channel_open_failure(Ssh ssh
, struct Packet
*pktin
)
4211 unsigned int remoteid
= ssh_pkt_getuint32(pktin
);
4212 struct ssh_channel
*c
;
4214 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
4215 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
4216 logevent("Forwarded connection refused by server");
4217 pfd_close(c
->u
.pfd
.s
);
4218 del234(ssh
->channels
, c
);
4223 static void ssh1_msg_channel_close(Ssh ssh
, struct Packet
*pktin
)
4225 /* Remote side closes a channel. */
4226 unsigned i
= ssh_pkt_getuint32(pktin
);
4227 struct ssh_channel
*c
;
4228 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
4229 if (c
&& !c
->halfopen
) {
4232 (pktin
->type
== SSH1_MSG_CHANNEL_CLOSE ?
1 : 2);
4234 if ((c
->closes
== 0) && (c
->type
== CHAN_X11
)) {
4235 logevent("Forwarded X11 connection terminated");
4236 assert(c
->u
.x11
.s
!= NULL
);
4237 x11_close(c
->u
.x11
.s
);
4240 if ((c
->closes
== 0) && (c
->type
== CHAN_SOCKDATA
)) {
4241 logevent("Forwarded port closed");
4242 assert(c
->u
.pfd
.s
!= NULL
);
4243 pfd_close(c
->u
.pfd
.s
);
4247 c
->closes
|= (closetype
<< 2); /* seen this message */
4248 if (!(c
->closes
& closetype
)) {
4249 send_packet(ssh
, pktin
->type
, PKT_INT
, c
->remoteid
,
4251 c
->closes
|= closetype
; /* sent it too */
4254 if (c
->closes
== 15) {
4255 del234(ssh
->channels
, c
);
4259 bombout(("Received CHANNEL_CLOSE%s for %s channel %d\n",
4260 pktin
->type
== SSH1_MSG_CHANNEL_CLOSE ?
"" :
4261 "_CONFIRMATION", c ?
"half-open" : "nonexistent",
4266 static void ssh1_msg_channel_data(Ssh ssh
, struct Packet
*pktin
)
4268 /* Data sent down one of our channels. */
4269 int i
= ssh_pkt_getuint32(pktin
);
4272 struct ssh_channel
*c
;
4274 ssh_pkt_getstring(pktin
, &p
, &len
);
4276 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
4281 bufsize
= x11_send(c
->u
.x11
.s
, p
, len
);
4284 bufsize
= pfd_send(c
->u
.pfd
.s
, p
, len
);
4287 /* Data for an agent message. Buffer it. */
4289 if (c
->u
.a
.lensofar
< 4) {
4290 unsigned int l
= min(4 - c
->u
.a
.lensofar
, len
);
4291 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
, p
,
4295 c
->u
.a
.lensofar
+= l
;
4297 if (c
->u
.a
.lensofar
== 4) {
4299 4 + GET_32BIT(c
->u
.a
.msglen
);
4300 c
->u
.a
.message
= snewn(c
->u
.a
.totallen
,
4302 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
4304 if (c
->u
.a
.lensofar
>= 4 && len
> 0) {
4306 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
4308 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
, p
,
4312 c
->u
.a
.lensofar
+= l
;
4314 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
4317 if (agent_query(c
->u
.a
.message
,
4320 ssh_agentf_callback
, c
))
4321 ssh_agentf_callback(c
, reply
, replylen
);
4322 sfree(c
->u
.a
.message
);
4323 c
->u
.a
.lensofar
= 0;
4326 bufsize
= 0; /* agent channels never back up */
4329 if (!c
->v
.v1
.throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
4330 c
->v
.v1
.throttling
= 1;
4331 ssh1_throttle(ssh
, +1);
4336 static void ssh1_smsg_exit_status(Ssh ssh
, struct Packet
*pktin
)
4338 ssh
->exitcode
= ssh_pkt_getuint32(pktin
);
4339 logeventf(ssh
, "Server sent command exit status %d", ssh
->exitcode
);
4340 send_packet(ssh
, SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
4342 * In case `helpful' firewalls or proxies tack
4343 * extra human-readable text on the end of the
4344 * session which we might mistake for another
4345 * encrypted packet, we close the session once
4346 * we've sent EXIT_CONFIRMATION.
4348 ssh
->close_expected
= TRUE
;
4349 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
4352 static void do_ssh1_connection(Ssh ssh
, unsigned char *in
, int inlen
,
4353 struct Packet
*pktin
)
4355 crBegin(ssh
->do_ssh1_connection_crstate
);
4357 ssh
->packet_dispatch
[SSH1_SMSG_STDOUT_DATA
] =
4358 ssh
->packet_dispatch
[SSH1_SMSG_STDERR_DATA
] =
4359 ssh1_smsg_stdout_stderr_data
;
4361 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
] =
4362 ssh1_msg_channel_open_confirmation
;
4363 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_OPEN_FAILURE
] =
4364 ssh1_msg_channel_open_failure
;
4365 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_CLOSE
] =
4366 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
] =
4367 ssh1_msg_channel_close
;
4368 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_DATA
] = ssh1_msg_channel_data
;
4369 ssh
->packet_dispatch
[SSH1_SMSG_EXIT_STATUS
] = ssh1_smsg_exit_status
;
4371 if (ssh
->cfg
.agentfwd
&& agent_exists()) {
4372 logevent("Requesting agent forwarding");
4373 send_packet(ssh
, SSH1_CMSG_AGENT_REQUEST_FORWARDING
, PKT_END
);
4377 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4378 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4379 bombout(("Protocol confusion"));
4381 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4382 logevent("Agent forwarding refused");
4384 logevent("Agent forwarding enabled");
4385 ssh
->agentfwd_enabled
= TRUE
;
4386 ssh
->packet_dispatch
[SSH1_SMSG_AGENT_OPEN
] = ssh1_smsg_agent_open
;
4390 if (ssh
->cfg
.x11_forward
) {
4391 char proto
[20], data
[64];
4392 logevent("Requesting X11 forwarding");
4393 ssh
->x11auth
= x11_invent_auth(proto
, sizeof(proto
),
4394 data
, sizeof(data
), ssh
->cfg
.x11_auth
);
4395 x11_get_real_auth(ssh
->x11auth
, ssh
->cfg
.x11_display
);
4396 if (ssh
->v1_local_protoflags
& SSH1_PROTOFLAG_SCREEN_NUMBER
) {
4397 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
4398 PKT_STR
, proto
, PKT_STR
, data
,
4399 PKT_INT
, x11_get_screen_number(ssh
->cfg
.x11_display
),
4402 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
4403 PKT_STR
, proto
, PKT_STR
, data
, PKT_END
);
4408 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4409 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4410 bombout(("Protocol confusion"));
4412 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4413 logevent("X11 forwarding refused");
4415 logevent("X11 forwarding enabled");
4416 ssh
->X11_fwd_enabled
= TRUE
;
4417 ssh
->packet_dispatch
[SSH1_SMSG_X11_OPEN
] = ssh1_smsg_x11_open
;
4421 ssh_setup_portfwd(ssh
, &ssh
->cfg
);
4422 ssh
->packet_dispatch
[SSH1_MSG_PORT_OPEN
] = ssh1_msg_port_open
;
4424 if (!ssh
->cfg
.nopty
) {
4425 /* Unpick the terminal-speed string. */
4426 /* XXX perhaps we should allow no speeds to be sent. */
4427 ssh
->ospeed
= 38400; ssh
->ispeed
= 38400; /* last-resort defaults */
4428 sscanf(ssh
->cfg
.termspeed
, "%d,%d", &ssh
->ospeed
, &ssh
->ispeed
);
4429 /* Send the pty request. */
4430 send_packet(ssh
, SSH1_CMSG_REQUEST_PTY
,
4431 PKT_STR
, ssh
->cfg
.termtype
,
4432 PKT_INT
, ssh
->term_height
,
4433 PKT_INT
, ssh
->term_width
,
4434 PKT_INT
, 0, PKT_INT
, 0, /* width,height in pixels */
4435 PKT_CHAR
, 192, PKT_INT
, ssh
->ispeed
, /* TTY_OP_ISPEED */
4436 PKT_CHAR
, 193, PKT_INT
, ssh
->ospeed
, /* TTY_OP_OSPEED */
4437 PKT_CHAR
, 0, PKT_END
);
4438 ssh
->state
= SSH_STATE_INTERMED
;
4442 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4443 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4444 bombout(("Protocol confusion"));
4446 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4447 c_write_str(ssh
, "Server refused to allocate pty\r\n");
4448 ssh
->editing
= ssh
->echoing
= 1;
4450 logeventf(ssh
, "Allocated pty (ospeed %dbps, ispeed %dbps)",
4451 ssh
->ospeed
, ssh
->ispeed
);
4453 ssh
->editing
= ssh
->echoing
= 1;
4456 if (ssh
->cfg
.compression
) {
4457 send_packet(ssh
, SSH1_CMSG_REQUEST_COMPRESSION
, PKT_INT
, 6, PKT_END
);
4461 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4462 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4463 bombout(("Protocol confusion"));
4465 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4466 c_write_str(ssh
, "Server refused to compress\r\n");
4468 logevent("Started compression");
4469 ssh
->v1_compressing
= TRUE
;
4470 ssh
->cs_comp_ctx
= zlib_compress_init();
4471 logevent("Initialised zlib (RFC1950) compression");
4472 ssh
->sc_comp_ctx
= zlib_decompress_init();
4473 logevent("Initialised zlib (RFC1950) decompression");
4477 * Start the shell or command.
4479 * Special case: if the first-choice command is an SSH2
4480 * subsystem (hence not usable here) and the second choice
4481 * exists, we fall straight back to that.
4484 char *cmd
= ssh
->cfg
.remote_cmd_ptr
;
4486 if (ssh
->cfg
.ssh_subsys
&& ssh
->cfg
.remote_cmd_ptr2
) {
4487 cmd
= ssh
->cfg
.remote_cmd_ptr2
;
4488 ssh
->fallback_cmd
= TRUE
;
4491 send_packet(ssh
, SSH1_CMSG_EXEC_CMD
, PKT_STR
, cmd
, PKT_END
);
4493 send_packet(ssh
, SSH1_CMSG_EXEC_SHELL
, PKT_END
);
4494 logevent("Started session");
4497 ssh
->state
= SSH_STATE_SESSION
;
4498 if (ssh
->size_needed
)
4499 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
4500 if (ssh
->eof_needed
)
4501 ssh_special(ssh
, TS_EOF
);
4504 ldisc_send(ssh
->ldisc
, NULL
, 0, 0);/* cause ldisc to notice changes */
4506 ssh
->channels
= newtree234(ssh_channelcmp
);
4510 * By this point, most incoming packets are already being
4511 * handled by the dispatch table, and we need only pay
4512 * attention to the unusual ones.
4517 if (pktin
->type
== SSH1_SMSG_SUCCESS
) {
4518 /* may be from EXEC_SHELL on some servers */
4519 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4520 /* may be from EXEC_SHELL on some servers
4521 * if no pty is available or in other odd cases. Ignore */
4523 bombout(("Strange packet received: type %d", pktin
->type
));
4528 int len
= min(inlen
, 512);
4529 send_packet(ssh
, SSH1_CMSG_STDIN_DATA
, PKTT_DATA
,
4530 PKT_INT
, len
, PKT_DATA
, in
, len
,
4531 PKTT_OTHER
, PKT_END
);
4542 * Handle the top-level SSH2 protocol.
4544 static void ssh1_msg_debug(Ssh ssh
, struct Packet
*pktin
)
4549 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
4550 logeventf(ssh
, "Remote debug message: %.*s", msglen
, msg
);
4553 static void ssh1_msg_disconnect(Ssh ssh
, struct Packet
*pktin
)
4555 /* log reason code in disconnect message */
4559 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
4560 bombout(("Server sent disconnect message:\n\"%.*s\"", msglen
, msg
));
4563 static void ssh_msg_ignore(Ssh ssh
, struct Packet
*pktin
)
4565 /* Do nothing, because we're ignoring it! Duhh. */
4568 static void ssh1_protocol_setup(Ssh ssh
)
4573 * Most messages are handled by the coroutines.
4575 for (i
= 0; i
< 256; i
++)
4576 ssh
->packet_dispatch
[i
] = NULL
;
4579 * These special message types we install handlers for.
4581 ssh
->packet_dispatch
[SSH1_MSG_DISCONNECT
] = ssh1_msg_disconnect
;
4582 ssh
->packet_dispatch
[SSH1_MSG_IGNORE
] = ssh_msg_ignore
;
4583 ssh
->packet_dispatch
[SSH1_MSG_DEBUG
] = ssh1_msg_debug
;
4586 static void ssh1_protocol(Ssh ssh
, void *vin
, int inlen
,
4587 struct Packet
*pktin
)
4589 unsigned char *in
=(unsigned char*)vin
;
4590 if (ssh
->state
== SSH_STATE_CLOSED
)
4593 if (pktin
&& ssh
->packet_dispatch
[pktin
->type
]) {
4594 ssh
->packet_dispatch
[pktin
->type
](ssh
, pktin
);
4598 if (!ssh
->protocol_initial_phase_done
) {
4599 if (do_ssh1_login(ssh
, in
, inlen
, pktin
))
4600 ssh
->protocol_initial_phase_done
= TRUE
;
4605 do_ssh1_connection(ssh
, in
, inlen
, pktin
);
4609 * Utility routine for decoding comma-separated strings in KEXINIT.
4611 static int in_commasep_string(char *needle
, char *haystack
, int haylen
)
4614 if (!needle
|| !haystack
) /* protect against null pointers */
4616 needlen
= strlen(needle
);
4619 * Is it at the start of the string?
4621 if (haylen
>= needlen
&& /* haystack is long enough */
4622 !memcmp(needle
, haystack
, needlen
) && /* initial match */
4623 (haylen
== needlen
|| haystack
[needlen
] == ',')
4624 /* either , or EOS follows */
4628 * If not, search for the next comma and resume after that.
4629 * If no comma found, terminate.
4631 while (haylen
> 0 && *haystack
!= ',')
4632 haylen
--, haystack
++;
4635 haylen
--, haystack
++; /* skip over comma itself */
4640 * Similar routine for checking whether we have the first string in a list.
4642 static int first_in_commasep_string(char *needle
, char *haystack
, int haylen
)
4645 if (!needle
|| !haystack
) /* protect against null pointers */
4647 needlen
= strlen(needle
);
4649 * Is it at the start of the string?
4651 if (haylen
>= needlen
&& /* haystack is long enough */
4652 !memcmp(needle
, haystack
, needlen
) && /* initial match */
4653 (haylen
== needlen
|| haystack
[needlen
] == ',')
4654 /* either , or EOS follows */
4662 * SSH2 key creation method.
4664 static void ssh2_mkkey(Ssh ssh
, Bignum K
, unsigned char *H
,
4665 unsigned char *sessid
, char chr
,
4666 unsigned char *keyspace
)
4669 /* First 20 bytes. */
4671 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
4673 SHA_Bytes(&s
, H
, 20);
4674 SHA_Bytes(&s
, &chr
, 1);
4675 SHA_Bytes(&s
, sessid
, 20);
4676 SHA_Final(&s
, keyspace
);
4677 /* Next 20 bytes. */
4679 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
4681 SHA_Bytes(&s
, H
, 20);
4682 SHA_Bytes(&s
, keyspace
, 20);
4683 SHA_Final(&s
, keyspace
+ 20);
4687 * Handle the SSH2 transport layer.
4689 static int do_ssh2_transport(Ssh ssh
, void *vin
, int inlen
,
4690 struct Packet
*pktin
)
4692 unsigned char *in
= (unsigned char *)vin
;
4693 struct do_ssh2_transport_state
{
4694 int nbits
, pbits
, warn
;
4695 Bignum p
, g
, e
, f
, K
;
4696 int kex_init_value
, kex_reply_value
;
4697 const struct ssh_mac
**maclist
;
4699 const struct ssh2_cipher
*cscipher_tobe
;
4700 const struct ssh2_cipher
*sccipher_tobe
;
4701 const struct ssh_mac
*csmac_tobe
;
4702 const struct ssh_mac
*scmac_tobe
;
4703 const struct ssh_compress
*cscomp_tobe
;
4704 const struct ssh_compress
*sccomp_tobe
;
4705 char *hostkeydata
, *sigdata
, *keystr
, *fingerprint
;
4706 int hostkeylen
, siglen
;
4707 void *hkey
; /* actual host key */
4708 unsigned char exchange_hash
[20];
4709 int n_preferred_kex
;
4710 const struct ssh_kex
*preferred_kex
[KEX_MAX
];
4711 int n_preferred_ciphers
;
4712 const struct ssh2_ciphers
*preferred_ciphers
[CIPHER_MAX
];
4713 const struct ssh_compress
*preferred_comp
;
4714 int got_session_id
, activated_authconn
;
4715 struct Packet
*pktout
;
4717 crState(do_ssh2_transport_state
);
4719 crBegin(ssh
->do_ssh2_transport_crstate
);
4721 s
->cscipher_tobe
= s
->sccipher_tobe
= NULL
;
4722 s
->csmac_tobe
= s
->scmac_tobe
= NULL
;
4723 s
->cscomp_tobe
= s
->sccomp_tobe
= NULL
;
4725 s
->got_session_id
= s
->activated_authconn
= FALSE
;
4728 * Be prepared to work around the buggy MAC problem.
4730 if (ssh
->remote_bugs
& BUG_SSH2_HMAC
)
4731 s
->maclist
= buggymacs
, s
->nmacs
= lenof(buggymacs
);
4733 s
->maclist
= macs
, s
->nmacs
= lenof(macs
);
4736 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_KEX_MASK
;
4738 int i
, j
, commalist_started
;
4741 * Set up the preferred key exchange. (NULL => warn below here)
4743 s
->n_preferred_kex
= 0;
4744 for (i
= 0; i
< KEX_MAX
; i
++) {
4745 switch (ssh
->cfg
.ssh_kexlist
[i
]) {
4747 s
->preferred_kex
[s
->n_preferred_kex
++] =
4748 &ssh_diffiehellman_gex
;
4751 s
->preferred_kex
[s
->n_preferred_kex
++] =
4752 &ssh_diffiehellman_group14
;
4755 s
->preferred_kex
[s
->n_preferred_kex
++] =
4756 &ssh_diffiehellman_group1
;
4759 /* Flag for later. Don't bother if it's the last in
4761 if (i
< KEX_MAX
- 1) {
4762 s
->preferred_kex
[s
->n_preferred_kex
++] = NULL
;
4769 * Set up the preferred ciphers. (NULL => warn below here)
4771 s
->n_preferred_ciphers
= 0;
4772 for (i
= 0; i
< CIPHER_MAX
; i
++) {
4773 switch (ssh
->cfg
.ssh_cipherlist
[i
]) {
4774 case CIPHER_BLOWFISH
:
4775 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_blowfish
;
4778 if (ssh
->cfg
.ssh2_des_cbc
) {
4779 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_des
;
4783 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_3des
;
4786 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_aes
;
4789 /* Flag for later. Don't bother if it's the last in
4791 if (i
< CIPHER_MAX
- 1) {
4792 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = NULL
;
4799 * Set up preferred compression.
4801 if (ssh
->cfg
.compression
)
4802 s
->preferred_comp
= &ssh_zlib
;
4804 s
->preferred_comp
= &ssh_comp_none
;
4807 * Enable queueing of outgoing auth- or connection-layer
4808 * packets while we are in the middle of a key exchange.
4810 ssh
->queueing
= TRUE
;
4813 * Flag that KEX is in progress.
4815 ssh
->kex_in_progress
= TRUE
;
4818 * Construct and send our key exchange packet.
4820 s
->pktout
= ssh2_pkt_init(SSH2_MSG_KEXINIT
);
4821 for (i
= 0; i
< 16; i
++)
4822 ssh2_pkt_addbyte(s
->pktout
, (unsigned char) random_byte());
4823 /* List key exchange algorithms. */
4824 ssh2_pkt_addstring_start(s
->pktout
);
4825 commalist_started
= 0;
4826 for (i
= 0; i
< s
->n_preferred_kex
; i
++) {
4827 const struct ssh_kex
*k
= s
->preferred_kex
[i
];
4828 if (!k
) continue; /* warning flag */
4829 if (commalist_started
)
4830 ssh2_pkt_addstring_str(s
->pktout
, ",");
4831 ssh2_pkt_addstring_str(s
->pktout
, s
->preferred_kex
[i
]->name
);
4832 commalist_started
= 1;
4834 /* List server host key algorithms. */
4835 ssh2_pkt_addstring_start(s
->pktout
);
4836 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
4837 ssh2_pkt_addstring_str(s
->pktout
, hostkey_algs
[i
]->name
);
4838 if (i
< lenof(hostkey_algs
) - 1)
4839 ssh2_pkt_addstring_str(s
->pktout
, ",");
4841 /* List client->server encryption algorithms. */
4842 ssh2_pkt_addstring_start(s
->pktout
);
4843 commalist_started
= 0;
4844 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4845 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4846 if (!c
) continue; /* warning flag */
4847 for (j
= 0; j
< c
->nciphers
; j
++) {
4848 if (commalist_started
)
4849 ssh2_pkt_addstring_str(s
->pktout
, ",");
4850 ssh2_pkt_addstring_str(s
->pktout
, c
->list
[j
]->name
);
4851 commalist_started
= 1;
4854 /* List server->client encryption algorithms. */
4855 ssh2_pkt_addstring_start(s
->pktout
);
4856 commalist_started
= 0;
4857 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4858 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4859 if (!c
) continue; /* warning flag */
4860 for (j
= 0; j
< c
->nciphers
; j
++) {
4861 if (commalist_started
)
4862 ssh2_pkt_addstring_str(s
->pktout
, ",");
4863 ssh2_pkt_addstring_str(s
->pktout
, c
->list
[j
]->name
);
4864 commalist_started
= 1;
4867 /* List client->server MAC algorithms. */
4868 ssh2_pkt_addstring_start(s
->pktout
);
4869 for (i
= 0; i
< s
->nmacs
; i
++) {
4870 ssh2_pkt_addstring_str(s
->pktout
, s
->maclist
[i
]->name
);
4871 if (i
< s
->nmacs
- 1)
4872 ssh2_pkt_addstring_str(s
->pktout
, ",");
4874 /* List server->client MAC algorithms. */
4875 ssh2_pkt_addstring_start(s
->pktout
);
4876 for (i
= 0; i
< s
->nmacs
; i
++) {
4877 ssh2_pkt_addstring_str(s
->pktout
, s
->maclist
[i
]->name
);
4878 if (i
< s
->nmacs
- 1)
4879 ssh2_pkt_addstring_str(s
->pktout
, ",");
4881 /* List client->server compression algorithms. */
4882 ssh2_pkt_addstring_start(s
->pktout
);
4883 assert(lenof(compressions
) > 1);
4884 ssh2_pkt_addstring_str(s
->pktout
, s
->preferred_comp
->name
);
4885 for (i
= 0; i
< lenof(compressions
); i
++) {
4886 const struct ssh_compress
*c
= compressions
[i
];
4887 if (c
!= s
->preferred_comp
) {
4888 ssh2_pkt_addstring_str(s
->pktout
, ",");
4889 ssh2_pkt_addstring_str(s
->pktout
, c
->name
);
4892 /* List server->client compression algorithms. */
4893 ssh2_pkt_addstring_start(s
->pktout
);
4894 assert(lenof(compressions
) > 1);
4895 ssh2_pkt_addstring_str(s
->pktout
, s
->preferred_comp
->name
);
4896 for (i
= 0; i
< lenof(compressions
); i
++) {
4897 const struct ssh_compress
*c
= compressions
[i
];
4898 if (c
!= s
->preferred_comp
) {
4899 ssh2_pkt_addstring_str(s
->pktout
, ",");
4900 ssh2_pkt_addstring_str(s
->pktout
, c
->name
);
4903 /* List client->server languages. Empty list. */
4904 ssh2_pkt_addstring_start(s
->pktout
);
4905 /* List server->client languages. Empty list. */
4906 ssh2_pkt_addstring_start(s
->pktout
);
4907 /* First KEX packet does _not_ follow, because we're not that brave. */
4908 ssh2_pkt_addbool(s
->pktout
, FALSE
);
4910 ssh2_pkt_adduint32(s
->pktout
, 0);
4913 ssh
->exhash
= ssh
->exhashbase
;
4914 sha_string(&ssh
->exhash
, s
->pktout
->data
+ 5, s
->pktout
->length
- 5);
4916 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
4920 if (pktin
->length
> 5)
4921 sha_string(&ssh
->exhash
, pktin
->data
+ 5, pktin
->length
- 5);
4924 * Now examine the other side's KEXINIT to see what we're up
4929 int i
, j
, len
, guessok
;
4931 if (pktin
->type
!= SSH2_MSG_KEXINIT
) {
4932 bombout(("expected key exchange packet from server"));
4936 ssh
->hostkey
= NULL
;
4937 s
->cscipher_tobe
= NULL
;
4938 s
->sccipher_tobe
= NULL
;
4939 s
->csmac_tobe
= NULL
;
4940 s
->scmac_tobe
= NULL
;
4941 s
->cscomp_tobe
= NULL
;
4942 s
->sccomp_tobe
= NULL
;
4943 pktin
->savedpos
+= 16; /* skip garbage cookie */
4944 ssh_pkt_getstring(pktin
, &str
, &len
); /* key exchange algorithms */
4946 for (i
= 0; i
< s
->n_preferred_kex
; i
++) {
4947 const struct ssh_kex
*k
= s
->preferred_kex
[i
];
4950 } else if (in_commasep_string(k
->name
, str
, len
)) {
4955 sk_set_frozen(ssh
->s
, 1);
4956 askalg(ssh
->frontend
, "key-exchange algorithm",
4958 sk_set_frozen(ssh
->s
, 0);
4964 bombout(("Couldn't agree a key exchange algorithm (available: %s)",
4965 str ? str
: "(null)"));
4969 * Note that the server's guess is considered wrong if it doesn't match
4970 * the first algorithm in our list, even if it's still the algorithm
4974 first_in_commasep_string(s
->preferred_kex
[0]->name
, str
, len
);
4975 ssh_pkt_getstring(pktin
, &str
, &len
); /* host key algorithms */
4976 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
4977 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
4978 ssh
->hostkey
= hostkey_algs
[i
];
4982 guessok
= guessok
&&
4983 first_in_commasep_string(hostkey_algs
[0]->name
, str
, len
);
4984 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server cipher */
4986 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4987 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4991 for (j
= 0; j
< c
->nciphers
; j
++) {
4992 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
4993 s
->cscipher_tobe
= c
->list
[j
];
4998 if (s
->cscipher_tobe
) {
5000 sk_set_frozen(ssh
->s
, 1);
5001 askalg(ssh
->frontend
, "client-to-server cipher",
5002 s
->cscipher_tobe
->name
);
5003 sk_set_frozen(ssh
->s
, 0);
5008 if (!s
->cscipher_tobe
) {
5009 bombout(("Couldn't agree a client-to-server cipher (available: %s)",
5010 str ? str
: "(null)"));
5014 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client cipher */
5016 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
5017 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
5021 for (j
= 0; j
< c
->nciphers
; j
++) {
5022 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
5023 s
->sccipher_tobe
= c
->list
[j
];
5028 if (s
->sccipher_tobe
) {
5030 sk_set_frozen(ssh
->s
, 1);
5031 askalg(ssh
->frontend
, "server-to-client cipher",
5032 s
->sccipher_tobe
->name
);
5033 sk_set_frozen(ssh
->s
, 0);
5038 if (!s
->sccipher_tobe
) {
5039 bombout(("Couldn't agree a server-to-client cipher (available: %s)",
5040 str ? str
: "(null)"));
5044 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server mac */
5045 for (i
= 0; i
< s
->nmacs
; i
++) {
5046 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
5047 s
->csmac_tobe
= s
->maclist
[i
];
5051 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client mac */
5052 for (i
= 0; i
< s
->nmacs
; i
++) {
5053 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
5054 s
->scmac_tobe
= s
->maclist
[i
];
5058 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server compression */
5059 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
5060 const struct ssh_compress
*c
=
5061 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
5062 if (in_commasep_string(c
->name
, str
, len
)) {
5067 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client compression */
5068 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
5069 const struct ssh_compress
*c
=
5070 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
5071 if (in_commasep_string(c
->name
, str
, len
)) {
5076 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server language */
5077 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client language */
5078 if (ssh2_pkt_getbool(pktin
) && !guessok
) /* first_kex_packet_follows */
5079 crWaitUntil(pktin
); /* Ignore packet */
5083 * Work out the number of bits of key we will need from the key
5084 * exchange. We start with the maximum key length of either
5090 csbits
= s
->cscipher_tobe
->keylen
;
5091 scbits
= s
->sccipher_tobe
->keylen
;
5092 s
->nbits
= (csbits
> scbits ? csbits
: scbits
);
5094 /* The keys only have 160-bit entropy, since they're based on
5095 * a SHA-1 hash. So cap the key size at 160 bits. */
5100 * If we're doing Diffie-Hellman group exchange, start by
5101 * requesting a group.
5103 if (!ssh
->kex
->pdata
) {
5104 logevent("Doing Diffie-Hellman group exchange");
5105 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGEX
;
5107 * Work out how big a DH group we will need to allow that
5110 s
->pbits
= 512 << ((s
->nbits
- 1) / 64);
5111 s
->pktout
= ssh2_pkt_init(SSH2_MSG_KEX_DH_GEX_REQUEST
);
5112 ssh2_pkt_adduint32(s
->pktout
, s
->pbits
);
5113 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5116 if (pktin
->type
!= SSH2_MSG_KEX_DH_GEX_GROUP
) {
5117 bombout(("expected key exchange group packet from server"));
5120 s
->p
= ssh2_pkt_getmp(pktin
);
5121 s
->g
= ssh2_pkt_getmp(pktin
);
5122 if (!s
->p
|| !s
->g
) {
5123 bombout(("unable to read mp-ints from incoming group packet"));
5126 ssh
->kex_ctx
= dh_setup_gex(s
->p
, s
->g
);
5127 s
->kex_init_value
= SSH2_MSG_KEX_DH_GEX_INIT
;
5128 s
->kex_reply_value
= SSH2_MSG_KEX_DH_GEX_REPLY
;
5130 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGROUP
;
5131 ssh
->kex_ctx
= dh_setup_group(ssh
->kex
);
5132 s
->kex_init_value
= SSH2_MSG_KEXDH_INIT
;
5133 s
->kex_reply_value
= SSH2_MSG_KEXDH_REPLY
;
5134 logeventf(ssh
, "Using Diffie-Hellman with standard group \"%s\"",
5135 ssh
->kex
->groupname
);
5138 logevent("Doing Diffie-Hellman key exchange");
5140 * Now generate and send e for Diffie-Hellman.
5142 s
->e
= dh_create_e(ssh
->kex_ctx
, s
->nbits
* 2);
5143 s
->pktout
= ssh2_pkt_init(s
->kex_init_value
);
5144 ssh2_pkt_addmp(s
->pktout
, s
->e
);
5145 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5148 if (pktin
->type
!= s
->kex_reply_value
) {
5149 bombout(("expected key exchange reply packet from server"));
5152 ssh_pkt_getstring(pktin
, &s
->hostkeydata
, &s
->hostkeylen
);
5153 s
->f
= ssh2_pkt_getmp(pktin
);
5155 bombout(("unable to parse key exchange reply packet"));
5158 ssh_pkt_getstring(pktin
, &s
->sigdata
, &s
->siglen
);
5160 s
->K
= dh_find_K(ssh
->kex_ctx
, s
->f
);
5162 sha_string(&ssh
->exhash
, s
->hostkeydata
, s
->hostkeylen
);
5163 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
5164 sha_uint32(&ssh
->exhash
, s
->pbits
);
5165 sha_mpint(&ssh
->exhash
, s
->p
);
5166 sha_mpint(&ssh
->exhash
, s
->g
);
5168 sha_mpint(&ssh
->exhash
, s
->e
);
5169 sha_mpint(&ssh
->exhash
, s
->f
);
5170 sha_mpint(&ssh
->exhash
, s
->K
);
5171 SHA_Final(&ssh
->exhash
, s
->exchange_hash
);
5173 dh_cleanup(ssh
->kex_ctx
);
5174 ssh
->kex_ctx
= NULL
;
5177 debug(("Exchange hash is:\n"));
5178 dmemdump(s
->exchange_hash
, 20);
5181 s
->hkey
= ssh
->hostkey
->newkey(s
->hostkeydata
, s
->hostkeylen
);
5183 !ssh
->hostkey
->verifysig(s
->hkey
, s
->sigdata
, s
->siglen
,
5184 (char *)s
->exchange_hash
, 20)) {
5185 bombout(("Server's host key did not match the signature supplied"));
5190 * Authenticate remote host: verify host key. (We've already
5191 * checked the signature of the exchange hash.)
5193 s
->keystr
= ssh
->hostkey
->fmtkey(s
->hkey
);
5194 s
->fingerprint
= ssh
->hostkey
->fingerprint(s
->hkey
);
5195 sk_set_frozen(ssh
->s
, 1);
5196 verify_ssh_host_key(ssh
->frontend
,
5197 ssh
->savedhost
, ssh
->savedport
, ssh
->hostkey
->keytype
,
5198 s
->keystr
, s
->fingerprint
);
5199 sk_set_frozen(ssh
->s
, 0);
5200 if (!s
->got_session_id
) { /* don't bother logging this in rekeys */
5201 logevent("Host key fingerprint is:");
5202 logevent(s
->fingerprint
);
5204 sfree(s
->fingerprint
);
5206 ssh
->hostkey
->freekey(s
->hkey
);
5209 * The exchange hash from the very first key exchange is also
5210 * the session id, used in session key construction and
5213 if (!s
->got_session_id
) {
5214 memcpy(ssh
->v2_session_id
, s
->exchange_hash
,
5215 sizeof(s
->exchange_hash
));
5216 s
->got_session_id
= TRUE
;
5220 * Send SSH2_MSG_NEWKEYS.
5222 s
->pktout
= ssh2_pkt_init(SSH2_MSG_NEWKEYS
);
5223 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5224 ssh
->outgoing_data_size
= 0; /* start counting from here */
5227 * We've sent client NEWKEYS, so create and initialise
5228 * client-to-server session keys.
5230 if (ssh
->cs_cipher_ctx
)
5231 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
5232 ssh
->cscipher
= s
->cscipher_tobe
;
5233 ssh
->cs_cipher_ctx
= ssh
->cscipher
->make_context();
5235 if (ssh
->cs_mac_ctx
)
5236 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
5237 ssh
->csmac
= s
->csmac_tobe
;
5238 ssh
->cs_mac_ctx
= ssh
->csmac
->make_context();
5240 if (ssh
->cs_comp_ctx
)
5241 ssh
->cscomp
->compress_cleanup(ssh
->cs_comp_ctx
);
5242 ssh
->cscomp
= s
->cscomp_tobe
;
5243 ssh
->cs_comp_ctx
= ssh
->cscomp
->compress_init();
5246 * Set IVs on client-to-server keys. Here we use the exchange
5247 * hash from the _first_ key exchange.
5250 unsigned char keyspace
[40];
5251 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'C',keyspace
);
5252 ssh
->cscipher
->setkey(ssh
->cs_cipher_ctx
, keyspace
);
5253 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'A',keyspace
);
5254 ssh
->cscipher
->setiv(ssh
->cs_cipher_ctx
, keyspace
);
5255 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'E',keyspace
);
5256 ssh
->csmac
->setkey(ssh
->cs_mac_ctx
, keyspace
);
5259 logeventf(ssh
, "Initialised %.200s client->server encryption",
5260 ssh
->cscipher
->text_name
);
5261 logeventf(ssh
, "Initialised %.200s client->server MAC algorithm",
5262 ssh
->csmac
->text_name
);
5263 if (ssh
->cscomp
->text_name
)
5264 logeventf(ssh
, "Initialised %s compression",
5265 ssh
->cscomp
->text_name
);
5268 * Now our end of the key exchange is complete, we can send all
5269 * our queued higher-layer packets.
5271 ssh
->queueing
= FALSE
;
5272 ssh2_pkt_queuesend(ssh
);
5275 * Expect SSH2_MSG_NEWKEYS from server.
5278 if (pktin
->type
!= SSH2_MSG_NEWKEYS
) {
5279 bombout(("expected new-keys packet from server"));
5282 ssh
->incoming_data_size
= 0; /* start counting from here */
5285 * We've seen server NEWKEYS, so create and initialise
5286 * server-to-client session keys.
5288 if (ssh
->sc_cipher_ctx
)
5289 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
5290 ssh
->sccipher
= s
->sccipher_tobe
;
5291 ssh
->sc_cipher_ctx
= ssh
->sccipher
->make_context();
5293 if (ssh
->sc_mac_ctx
)
5294 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
5295 ssh
->scmac
= s
->scmac_tobe
;
5296 ssh
->sc_mac_ctx
= ssh
->scmac
->make_context();
5298 if (ssh
->sc_comp_ctx
)
5299 ssh
->sccomp
->decompress_cleanup(ssh
->sc_comp_ctx
);
5300 ssh
->sccomp
= s
->sccomp_tobe
;
5301 ssh
->sc_comp_ctx
= ssh
->sccomp
->decompress_init();
5304 * Set IVs on server-to-client keys. Here we use the exchange
5305 * hash from the _first_ key exchange.
5308 unsigned char keyspace
[40];
5309 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'D',keyspace
);
5310 ssh
->sccipher
->setkey(ssh
->sc_cipher_ctx
, keyspace
);
5311 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'B',keyspace
);
5312 ssh
->sccipher
->setiv(ssh
->sc_cipher_ctx
, keyspace
);
5313 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'F',keyspace
);
5314 ssh
->scmac
->setkey(ssh
->sc_mac_ctx
, keyspace
);
5316 logeventf(ssh
, "Initialised %.200s server->client encryption",
5317 ssh
->sccipher
->text_name
);
5318 logeventf(ssh
, "Initialised %.200s server->client MAC algorithm",
5319 ssh
->scmac
->text_name
);
5320 if (ssh
->sccomp
->text_name
)
5321 logeventf(ssh
, "Initialised %s decompression",
5322 ssh
->sccomp
->text_name
);
5325 * Free key exchange data.
5329 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
5335 * Key exchange is over. Loop straight back round if we have a
5336 * deferred rekey reason.
5338 if (ssh
->deferred_rekey_reason
) {
5339 logevent(ssh
->deferred_rekey_reason
);
5341 ssh
->deferred_rekey_reason
= NULL
;
5342 goto begin_key_exchange
;
5346 * Otherwise, schedule a timer for our next rekey.
5348 ssh
->kex_in_progress
= FALSE
;
5349 ssh
->last_rekey
= GETTICKCOUNT();
5350 if (ssh
->cfg
.ssh_rekey_time
!= 0)
5351 ssh
->next_rekey
= schedule_timer(ssh
->cfg
.ssh_rekey_time
*60*TICKSPERSEC
,
5355 * If this is the first key exchange phase, we must pass the
5356 * SSH2_MSG_NEWKEYS packet to the next layer, not because it
5357 * wants to see it but because it will need time to initialise
5358 * itself before it sees an actual packet. In subsequent key
5359 * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because
5360 * it would only confuse the layer above.
5362 if (s
->activated_authconn
) {
5365 s
->activated_authconn
= TRUE
;
5368 * Now we're encrypting. Begin returning 1 to the protocol main
5369 * function so that other things can run on top of the
5370 * transport. If we ever see a KEXINIT, we must go back to the
5373 * We _also_ go back to the start if we see pktin==NULL and
5374 * inlen==-1, because this is a special signal meaning
5375 * `initiate client-driven rekey', and `in' contains a message
5376 * giving the reason for the rekey.
5378 while (!((pktin
&& pktin
->type
== SSH2_MSG_KEXINIT
) ||
5379 (!pktin
&& inlen
== -1))) {
5384 logevent("Server initiated key re-exchange");
5387 * Special case: if the server bug is set that doesn't
5388 * allow rekeying, we give a different log message and
5389 * continue waiting. (If such a server _initiates_ a rekey,
5390 * we process it anyway!)
5392 if ((ssh
->remote_bugs
& BUG_SSH2_REKEY
)) {
5393 logeventf(ssh
, "Server bug prevents key re-exchange (%s)",
5395 /* Reset the counters, so that at least this message doesn't
5396 * hit the event log _too_ often. */
5397 ssh
->outgoing_data_size
= 0;
5398 ssh
->incoming_data_size
= 0;
5399 if (ssh
->cfg
.ssh_rekey_time
!= 0) {
5401 schedule_timer(ssh
->cfg
.ssh_rekey_time
*60*TICKSPERSEC
,
5404 goto wait_for_rekey
; /* this is utterly horrid */
5406 logeventf(ssh
, "Initiating key re-exchange (%s)", (char *)in
);
5409 goto begin_key_exchange
;
5415 * Add data to an SSH2 channel output buffer.
5417 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
,
5420 bufchain_add(&c
->v
.v2
.outbuffer
, buf
, len
);
5424 * Attempt to send data on an SSH2 channel.
5426 static int ssh2_try_send(struct ssh_channel
*c
)
5429 struct Packet
*pktout
;
5431 while (c
->v
.v2
.remwindow
> 0 && bufchain_size(&c
->v
.v2
.outbuffer
) > 0) {
5434 bufchain_prefix(&c
->v
.v2
.outbuffer
, &data
, &len
);
5435 if ((unsigned)len
> c
->v
.v2
.remwindow
)
5436 len
= c
->v
.v2
.remwindow
;
5437 if ((unsigned)len
> c
->v
.v2
.remmaxpkt
)
5438 len
= c
->v
.v2
.remmaxpkt
;
5439 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA
);
5440 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5441 dont_log_data(ssh
, pktout
, PKTLOG_OMIT
);
5442 ssh2_pkt_addstring_start(pktout
);
5443 ssh2_pkt_addstring_data(pktout
, data
, len
);
5444 end_log_omission(ssh
, pktout
);
5445 ssh2_pkt_send(ssh
, pktout
);
5446 bufchain_consume(&c
->v
.v2
.outbuffer
, len
);
5447 c
->v
.v2
.remwindow
-= len
;
5451 * After having sent as much data as we can, return the amount
5454 return bufchain_size(&c
->v
.v2
.outbuffer
);
5458 * Potentially enlarge the window on an SSH2 channel.
5460 static void ssh2_set_window(struct ssh_channel
*c
, unsigned newwin
)
5465 * Never send WINDOW_ADJUST for a channel that the remote side
5466 * already thinks it's closed; there's no point, since it won't
5467 * be sending any more data anyway.
5473 * Only send a WINDOW_ADJUST if there's significantly more window
5474 * available than the other end thinks there is. This saves us
5475 * sending a WINDOW_ADJUST for every character in a shell session.
5477 * "Significant" is arbitrarily defined as half the window size.
5479 if (newwin
> c
->v
.v2
.locwindow
* 2) {
5480 struct Packet
*pktout
;
5482 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5483 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5484 ssh2_pkt_adduint32(pktout
, newwin
- c
->v
.v2
.locwindow
);
5485 ssh2_pkt_send(ssh
, pktout
);
5486 c
->v
.v2
.locwindow
= newwin
;
5490 static void ssh2_msg_channel_window_adjust(Ssh ssh
, struct Packet
*pktin
)
5492 unsigned i
= ssh_pkt_getuint32(pktin
);
5493 struct ssh_channel
*c
;
5494 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5495 if (c
&& !c
->closes
)
5496 c
->v
.v2
.remwindow
+= ssh_pkt_getuint32(pktin
);
5499 static void ssh2_msg_channel_data(Ssh ssh
, struct Packet
*pktin
)
5503 unsigned i
= ssh_pkt_getuint32(pktin
);
5504 struct ssh_channel
*c
;
5505 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5507 return; /* nonexistent channel */
5508 if (pktin
->type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
&&
5509 ssh_pkt_getuint32(pktin
) != SSH2_EXTENDED_DATA_STDERR
)
5510 return; /* extended but not stderr */
5511 ssh_pkt_getstring(pktin
, &data
, &length
);
5514 c
->v
.v2
.locwindow
-= length
;
5516 case CHAN_MAINSESSION
:
5518 from_backend(ssh
->frontend
, pktin
->type
==
5519 SSH2_MSG_CHANNEL_EXTENDED_DATA
,
5523 bufsize
= x11_send(c
->u
.x11
.s
, data
, length
);
5526 bufsize
= pfd_send(c
->u
.pfd
.s
, data
, length
);
5529 while (length
> 0) {
5530 if (c
->u
.a
.lensofar
< 4) {
5531 unsigned int l
= min(4 - c
->u
.a
.lensofar
, length
);
5532 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
,
5536 c
->u
.a
.lensofar
+= l
;
5538 if (c
->u
.a
.lensofar
== 4) {
5540 4 + GET_32BIT(c
->u
.a
.msglen
);
5541 c
->u
.a
.message
= snewn(c
->u
.a
.totallen
,
5543 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
5545 if (c
->u
.a
.lensofar
>= 4 && length
> 0) {
5547 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
5549 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
,
5553 c
->u
.a
.lensofar
+= l
;
5555 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
5558 if (agent_query(c
->u
.a
.message
,
5561 ssh_agentf_callback
, c
))
5562 ssh_agentf_callback(c
, reply
, replylen
);
5563 sfree(c
->u
.a
.message
);
5564 c
->u
.a
.lensofar
= 0;
5571 * If we are not buffering too much data,
5572 * enlarge the window again at the remote side.
5574 if (bufsize
< OUR_V2_WINSIZE
)
5575 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
5579 static void ssh2_msg_channel_eof(Ssh ssh
, struct Packet
*pktin
)
5581 unsigned i
= ssh_pkt_getuint32(pktin
);
5582 struct ssh_channel
*c
;
5584 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5586 return; /* nonexistent channel */
5588 if (c
->type
== CHAN_X11
) {
5590 * Remote EOF on an X11 channel means we should
5591 * wrap up and close the channel ourselves.
5593 x11_close(c
->u
.x11
.s
);
5595 } else if (c
->type
== CHAN_AGENT
) {
5597 } else if (c
->type
== CHAN_SOCKDATA
) {
5598 pfd_close(c
->u
.pfd
.s
);
5603 static void ssh2_msg_channel_close(Ssh ssh
, struct Packet
*pktin
)
5605 unsigned i
= ssh_pkt_getuint32(pktin
);
5606 struct ssh_channel
*c
;
5607 struct Packet
*pktout
;
5609 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5610 if (!c
|| c
->halfopen
) {
5611 bombout(("Received CHANNEL_CLOSE for %s channel %d\n",
5612 c ?
"half-open" : "nonexistent", i
));
5615 /* Do pre-close processing on the channel. */
5617 case CHAN_MAINSESSION
:
5618 ssh
->mainchan
= NULL
;
5619 update_specials_menu(ssh
->frontend
);
5622 if (c
->u
.x11
.s
!= NULL
)
5623 x11_close(c
->u
.x11
.s
);
5630 if (c
->u
.pfd
.s
!= NULL
)
5631 pfd_close(c
->u
.pfd
.s
);
5635 if (c
->closes
== 0) {
5636 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
5637 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5638 ssh2_pkt_send(ssh
, pktout
);
5640 del234(ssh
->channels
, c
);
5641 bufchain_clear(&c
->v
.v2
.outbuffer
);
5645 * See if that was the last channel left open.
5646 * (This is only our termination condition if we're
5647 * not running in -N mode.)
5649 if (!ssh
->cfg
.ssh_no_shell
&& count234(ssh
->channels
) == 0) {
5650 logevent("All channels closed. Disconnecting");
5653 * We used to send SSH_MSG_DISCONNECT here,
5654 * because I'd believed that _every_ conforming
5655 * SSH2 connection had to end with a disconnect
5656 * being sent by at least one side; apparently
5657 * I was wrong and it's perfectly OK to
5658 * unceremoniously slam the connection shut
5659 * when you're done, and indeed OpenSSH feels
5660 * this is more polite than sending a
5661 * DISCONNECT. So now we don't.
5663 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
5664 ssh2_pkt_adduint32(s
->pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
5665 ssh2_pkt_addstring(s
->pktout
, "All open channels closed");
5666 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
5667 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5669 ssh
->close_expected
= TRUE
;
5670 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5674 static void ssh2_msg_channel_open_confirmation(Ssh ssh
, struct Packet
*pktin
)
5676 unsigned i
= ssh_pkt_getuint32(pktin
);
5677 struct ssh_channel
*c
;
5678 struct Packet
*pktout
;
5680 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5682 return; /* nonexistent channel */
5683 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
5684 return; /* dunno why they're confirming this */
5685 c
->remoteid
= ssh_pkt_getuint32(pktin
);
5686 c
->halfopen
= FALSE
;
5687 c
->type
= CHAN_SOCKDATA
;
5688 c
->v
.v2
.remwindow
= ssh_pkt_getuint32(pktin
);
5689 c
->v
.v2
.remmaxpkt
= ssh_pkt_getuint32(pktin
);
5691 pfd_confirm(c
->u
.pfd
.s
);
5694 * We have a pending close on this channel,
5695 * which we decided on before the server acked
5696 * the channel open. So now we know the
5697 * remoteid, we can close it again.
5699 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
5700 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5701 ssh2_pkt_send(ssh
, pktout
);
5705 static void ssh2_msg_channel_open_failure(Ssh ssh
, struct Packet
*pktin
)
5707 static const char *const reasons
[] = {
5708 "<unknown reason code>",
5709 "Administratively prohibited",
5711 "Unknown channel type",
5712 "Resource shortage",
5714 unsigned i
= ssh_pkt_getuint32(pktin
);
5715 unsigned reason_code
;
5716 char *reason_string
;
5718 struct ssh_channel
*c
;
5719 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5721 return; /* nonexistent channel */
5722 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
5723 return; /* dunno why they're failing this */
5725 reason_code
= ssh_pkt_getuint32(pktin
);
5726 if (reason_code
>= lenof(reasons
))
5727 reason_code
= 0; /* ensure reasons[reason_code] in range */
5728 ssh_pkt_getstring(pktin
, &reason_string
, &reason_length
);
5729 logeventf(ssh
, "Forwarded connection refused by server: %s [%.*s]",
5730 reasons
[reason_code
], reason_length
, reason_string
);
5732 pfd_close(c
->u
.pfd
.s
);
5734 del234(ssh
->channels
, c
);
5738 static void ssh2_msg_channel_request(Ssh ssh
, struct Packet
*pktin
)
5742 int typelen
, want_reply
;
5743 int reply
= SSH2_MSG_CHANNEL_FAILURE
; /* default */
5744 struct ssh_channel
*c
;
5745 struct Packet
*pktout
;
5747 localid
= ssh_pkt_getuint32(pktin
);
5748 ssh_pkt_getstring(pktin
, &type
, &typelen
);
5749 want_reply
= ssh2_pkt_getbool(pktin
);
5752 * First, check that the channel exists. Otherwise,
5753 * we can instantly disconnect with a rude message.
5755 c
= find234(ssh
->channels
, &localid
, ssh_channelfind
);
5758 sprintf(buf
, "Received channel request for nonexistent"
5759 " channel %d", localid
);
5761 pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
5762 ssh2_pkt_adduint32(pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
5763 ssh2_pkt_addstring(pktout
, buf
);
5764 ssh2_pkt_addstring(pktout
, "en"); /* language tag */
5765 ssh2_pkt_send_noqueue(ssh
, pktout
);
5766 connection_fatal(ssh
->frontend
, "%s", buf
);
5767 ssh
->close_expected
= TRUE
;
5768 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5773 * Having got the channel number, we now look at
5774 * the request type string to see if it's something
5777 if (c
== ssh
->mainchan
) {
5779 * We recognise "exit-status" and "exit-signal" on
5780 * the primary channel.
5782 if (typelen
== 11 &&
5783 !memcmp(type
, "exit-status", 11)) {
5785 ssh
->exitcode
= ssh_pkt_getuint32(pktin
);
5786 logeventf(ssh
, "Server sent command exit status %d",
5788 reply
= SSH2_MSG_CHANNEL_SUCCESS
;
5790 } else if (typelen
== 11 &&
5791 !memcmp(type
, "exit-signal", 11)) {
5793 int is_plausible
= TRUE
, is_int
= FALSE
;
5794 char *fmt_sig
= "", *fmt_msg
= "";
5796 int msglen
= 0, core
= FALSE
;
5797 /* ICK: older versions of OpenSSH (e.g. 3.4p1)
5798 * provide an `int' for the signal, despite its
5799 * having been a `string' in the drafts since at
5800 * least 2001. (Fixed in session.c 1.147.) Try to
5801 * infer which we can safely parse it as. */
5803 unsigned char *p
= pktin
->body
+
5805 long len
= pktin
->length
- pktin
->savedpos
;
5806 unsigned long num
= GET_32BIT(p
); /* what is it? */
5807 /* If it's 0, it hardly matters; assume string */
5811 int maybe_int
= FALSE
, maybe_str
= FALSE
;
5812 #define CHECK_HYPOTHESIS(offset, result) \
5815 if (q >= 0 && q+4 <= len) { \
5816 q = q + 4 + GET_32BIT(p+q); \
5817 if (q >= 0 && q+4 <= len && \
5818 ((q = q + 4 + GET_32BIT(p+q))!= 0) && q == len) \
5822 CHECK_HYPOTHESIS(4+1, maybe_int
);
5823 CHECK_HYPOTHESIS(4+num
+1, maybe_str
);
5824 #undef CHECK_HYPOTHESIS
5825 if (maybe_int
&& !maybe_str
)
5827 else if (!maybe_int
&& maybe_str
)
5830 /* Crikey. Either or neither. Panic. */
5831 is_plausible
= FALSE
;
5836 /* Old non-standard OpenSSH. */
5837 int signum
= ssh_pkt_getuint32(pktin
);
5838 fmt_sig
= dupprintf(" %d", signum
);
5840 /* As per the drafts. */
5843 ssh_pkt_getstring(pktin
, &sig
, &siglen
);
5844 /* Signal name isn't supposed to be blank, but
5845 * let's cope gracefully if it is. */
5847 fmt_sig
= dupprintf(" \"%.*s\"",
5851 core
= ssh2_pkt_getbool(pktin
);
5852 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
5854 fmt_msg
= dupprintf(" (\"%.*s\")", msglen
, msg
);
5856 /* ignore lang tag */
5857 } /* else don't attempt to parse */
5858 logeventf(ssh
, "Server exited on signal%s%s%s",
5859 fmt_sig
, core ?
" (core dumped)" : "",
5861 if (*fmt_sig
) sfree(fmt_sig
);
5862 if (*fmt_msg
) sfree(fmt_msg
);
5863 reply
= SSH2_MSG_CHANNEL_SUCCESS
;
5868 * This is a channel request we don't know
5869 * about, so we now either ignore the request
5870 * or respond with CHANNEL_FAILURE, depending
5873 reply
= SSH2_MSG_CHANNEL_FAILURE
;
5876 pktout
= ssh2_pkt_init(reply
);
5877 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5878 ssh2_pkt_send(ssh
, pktout
);
5882 static void ssh2_msg_global_request(Ssh ssh
, struct Packet
*pktin
)
5885 int typelen
, want_reply
;
5886 struct Packet
*pktout
;
5888 ssh_pkt_getstring(pktin
, &type
, &typelen
);
5889 want_reply
= ssh2_pkt_getbool(pktin
);
5892 * We currently don't support any global requests
5893 * at all, so we either ignore the request or
5894 * respond with REQUEST_FAILURE, depending on
5898 pktout
= ssh2_pkt_init(SSH2_MSG_REQUEST_FAILURE
);
5899 ssh2_pkt_send(ssh
, pktout
);
5903 static void ssh2_msg_channel_open(Ssh ssh
, struct Packet
*pktin
)
5911 struct ssh_channel
*c
;
5912 unsigned remid
, winsize
, pktsize
;
5913 struct Packet
*pktout
;
5915 ssh_pkt_getstring(pktin
, &type
, &typelen
);
5916 c
= snew(struct ssh_channel
);
5919 remid
= ssh_pkt_getuint32(pktin
);
5920 winsize
= ssh_pkt_getuint32(pktin
);
5921 pktsize
= ssh_pkt_getuint32(pktin
);
5923 if (typelen
== 3 && !memcmp(type
, "x11", 3)) {
5926 ssh_pkt_getstring(pktin
, &peeraddr
, &peeraddrlen
);
5927 addrstr
= snewn(peeraddrlen
+1, char);
5928 memcpy(addrstr
, peeraddr
, peeraddrlen
);
5929 addrstr
[peeraddrlen
] = '\0';
5930 peerport
= ssh_pkt_getuint32(pktin
);
5932 logeventf(ssh
, "Received X11 connect request from %s:%d",
5935 if (!ssh
->X11_fwd_enabled
)
5936 error
= "X11 forwarding is not enabled";
5937 else if (x11_init(&c
->u
.x11
.s
, ssh
->cfg
.x11_display
, c
,
5938 ssh
->x11auth
, addrstr
, peerport
,
5939 &ssh
->cfg
) != NULL
) {
5940 error
= "Unable to open an X11 connection";
5942 logevent("Opening X11 forward connection succeeded");
5947 } else if (typelen
== 15 &&
5948 !memcmp(type
, "forwarded-tcpip", 15)) {
5949 struct ssh_rportfwd pf
, *realpf
;
5952 ssh_pkt_getstring(pktin
, &dummy
, &dummylen
);/* skip address */
5953 pf
.sport
= ssh_pkt_getuint32(pktin
);
5954 ssh_pkt_getstring(pktin
, &peeraddr
, &peeraddrlen
);
5955 peerport
= ssh_pkt_getuint32(pktin
);
5956 realpf
= find234(ssh
->rportfwds
, &pf
, NULL
);
5957 logeventf(ssh
, "Received remote port %d open request "
5958 "from %s:%d", pf
.sport
, peeraddr
, peerport
);
5959 if (realpf
== NULL
) {
5960 error
= "Remote port is not recognised";
5962 const char *e
= pfd_newconnect(&c
->u
.pfd
.s
,
5966 realpf
->pfrec
->addressfamily
);
5967 logeventf(ssh
, "Attempting to forward remote port to "
5968 "%s:%d", realpf
->dhost
, realpf
->dport
);
5970 logeventf(ssh
, "Port open failed: %s", e
);
5971 error
= "Port open failed";
5973 logevent("Forwarded port opened successfully");
5974 c
->type
= CHAN_SOCKDATA
;
5977 } else if (typelen
== 22 &&
5978 !memcmp(type
, "auth-agent@openssh.com", 3)) {
5979 if (!ssh
->agentfwd_enabled
)
5980 error
= "Agent forwarding is not enabled";
5982 c
->type
= CHAN_AGENT
; /* identify channel type */
5983 c
->u
.a
.lensofar
= 0;
5986 error
= "Unsupported channel type requested";
5989 c
->remoteid
= remid
;
5990 c
->halfopen
= FALSE
;
5992 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_FAILURE
);
5993 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5994 ssh2_pkt_adduint32(pktout
, SSH2_OPEN_CONNECT_FAILED
);
5995 ssh2_pkt_addstring(pktout
, error
);
5996 ssh2_pkt_addstring(pktout
, "en"); /* language tag */
5997 ssh2_pkt_send(ssh
, pktout
);
5998 logeventf(ssh
, "Rejected channel open: %s", error
);
6001 c
->localid
= alloc_channel_id(ssh
);
6003 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
6004 c
->v
.v2
.remwindow
= winsize
;
6005 c
->v
.v2
.remmaxpkt
= pktsize
;
6006 bufchain_init(&c
->v
.v2
.outbuffer
);
6007 add234(ssh
->channels
, c
);
6008 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
);
6009 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
6010 ssh2_pkt_adduint32(pktout
, c
->localid
);
6011 ssh2_pkt_adduint32(pktout
, c
->v
.v2
.locwindow
);
6012 ssh2_pkt_adduint32(pktout
, OUR_V2_MAXPKT
); /* our max pkt size */
6013 ssh2_pkt_send(ssh
, pktout
);
6018 * Handle the SSH2 userauth and connection layers.
6020 static void do_ssh2_authconn(Ssh ssh
, unsigned char *in
, int inlen
,
6021 struct Packet
*pktin
)
6023 struct do_ssh2_authconn_state
{
6025 AUTH_INVALID
, AUTH_PUBLICKEY_AGENT
, AUTH_PUBLICKEY_FILE
,
6027 AUTH_KEYBOARD_INTERACTIVE
6031 AUTH_TYPE_PUBLICKEY
,
6032 AUTH_TYPE_PUBLICKEY_OFFER_LOUD
,
6033 AUTH_TYPE_PUBLICKEY_OFFER_QUIET
,
6035 AUTH_TYPE_KEYBOARD_INTERACTIVE
,
6036 AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
6038 int gotit
, need_pw
, can_pubkey
, can_passwd
, can_keyb_inter
;
6039 int tried_pubkey_config
, tried_agent
;
6040 int kbd_inter_running
, kbd_inter_refused
;
6042 int num_prompts
, curr_prompt
, echo
;
6047 void *publickey_blob
;
6048 int publickey_bloblen
;
6049 unsigned char request
[5], *response
, *p
;
6053 char *pkblob
, *alg
, *commentp
;
6054 int pklen
, alglen
, commentlen
;
6055 int siglen
, retlen
, len
;
6056 char *q
, *agentreq
, *ret
;
6058 int num_env
, env_left
, env_ok
;
6059 struct Packet
*pktout
;
6061 crState(do_ssh2_authconn_state
);
6063 crBegin(ssh
->do_ssh2_authconn_crstate
);
6066 * Request userauth protocol, and await a response to it.
6068 s
->pktout
= ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST
);
6069 ssh2_pkt_addstring(s
->pktout
, "ssh-userauth");
6070 ssh2_pkt_send(ssh
, s
->pktout
);
6071 crWaitUntilV(pktin
);
6072 if (pktin
->type
!= SSH2_MSG_SERVICE_ACCEPT
) {
6073 bombout(("Server refused user authentication protocol"));
6078 * We repeat this whole loop, including the username prompt,
6079 * until we manage a successful authentication. If the user
6080 * types the wrong _password_, they can be sent back to the
6081 * beginning to try another username, if this is configured on.
6082 * (If they specify a username in the config, they are never
6083 * asked, even if they do give a wrong password.)
6085 * I think this best serves the needs of
6087 * - the people who have no configuration, no keys, and just
6088 * want to try repeated (username,password) pairs until they
6089 * type both correctly
6091 * - people who have keys and configuration but occasionally
6092 * need to fall back to passwords
6094 * - people with a key held in Pageant, who might not have
6095 * logged in to a particular machine before; so they want to
6096 * type a username, and then _either_ their key will be
6097 * accepted, _or_ they will type a password. If they mistype
6098 * the username they will want to be able to get back and
6101 s
->username
[0] = '\0';
6102 s
->got_username
= FALSE
;
6107 if (s
->got_username
&& !ssh
->cfg
.change_username
) {
6109 * We got a username last time round this loop, and
6110 * with change_username turned off we don't try to get
6113 } else if (!*ssh
->cfg
.username
) {
6114 if (ssh_get_line
&& !ssh_getline_pw_only
) {
6115 if (!ssh_get_line("login as: ",
6116 s
->username
, sizeof(s
->username
), FALSE
)) {
6118 * get_line failed to get a username.
6121 logevent("No username provided. Abandoning session.");
6122 ssh
->close_expected
= TRUE
;
6123 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6127 int ret
; /* need not be saved across crReturn */
6128 c_write_str(ssh
, "login as: ");
6130 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
6132 crWaitUntilV(!pktin
);
6133 ret
= process_userpass_input(ssh
, in
, inlen
);
6137 c_write_str(ssh
, "\r\n");
6139 s
->username
[strcspn(s
->username
, "\n\r")] = '\0';
6142 strncpy(s
->username
, ssh
->cfg
.username
, sizeof(s
->username
));
6143 s
->username
[sizeof(s
->username
)-1] = '\0';
6144 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
6145 stuff
= dupprintf("Using username \"%s\".\r\n", s
->username
);
6146 c_write_str(ssh
, stuff
);
6150 s
->got_username
= TRUE
;
6153 * Send an authentication request using method "none": (a)
6154 * just in case it succeeds, and (b) so that we know what
6155 * authentication methods we can usefully try next.
6157 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6159 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6160 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6161 ssh2_pkt_addstring(s
->pktout
, "ssh-connection");/* service requested */
6162 ssh2_pkt_addstring(s
->pktout
, "none"); /* method */
6163 ssh2_pkt_send(ssh
, s
->pktout
);
6164 s
->type
= AUTH_TYPE_NONE
;
6166 s
->we_are_in
= FALSE
;
6168 s
->tried_pubkey_config
= FALSE
;
6169 s
->tried_agent
= FALSE
;
6170 s
->kbd_inter_running
= FALSE
;
6171 s
->kbd_inter_refused
= FALSE
;
6172 /* Load the pub half of ssh->cfg.keyfile so we notice if it's in Pageant */
6173 if (!filename_is_null(ssh
->cfg
.keyfile
)) {
6175 logeventf(ssh
, "Reading private key file \"%.150s\"",
6176 filename_to_str(&ssh
->cfg
.keyfile
));
6177 keytype
= key_type(&ssh
->cfg
.keyfile
);
6178 if (keytype
== SSH_KEYTYPE_SSH2
) {
6180 ssh2_userkey_loadpub(&ssh
->cfg
.keyfile
, NULL
,
6181 &s
->publickey_bloblen
, NULL
);
6184 logeventf(ssh
, "Unable to use this key file (%s)",
6185 key_type_to_str(keytype
));
6186 msgbuf
= dupprintf("Unable to use key file \"%.150s\""
6188 filename_to_str(&ssh
->cfg
.keyfile
),
6189 key_type_to_str(keytype
));
6190 c_write_str(ssh
, msgbuf
);
6192 s
->publickey_blob
= NULL
;
6195 s
->publickey_blob
= NULL
;
6199 * Wait for the result of the last authentication request.
6202 crWaitUntilV(pktin
);
6203 while (pktin
->type
== SSH2_MSG_USERAUTH_BANNER
) {
6207 * Don't show the banner if we're operating in
6208 * non-verbose non-interactive mode. (It's probably
6209 * a script, which means nobody will read the
6210 * banner _anyway_, and moreover the printing of
6211 * the banner will screw up processing on the
6212 * output of (say) plink.)
6214 if (flags
& (FLAG_VERBOSE
| FLAG_INTERACTIVE
)) {
6215 ssh_pkt_getstring(pktin
, &banner
, &size
);
6217 c_write_untrusted(ssh
, banner
, size
);
6219 crWaitUntilV(pktin
);
6221 if (pktin
->type
== SSH2_MSG_USERAUTH_SUCCESS
) {
6222 logevent("Access granted");
6223 s
->we_are_in
= TRUE
;
6227 if (s
->kbd_inter_running
&&
6228 pktin
->type
== SSH2_MSG_USERAUTH_INFO_REQUEST
) {
6230 * This is either a further set-of-prompts packet
6231 * in keyboard-interactive authentication, or it's
6232 * the same one and we came back here with `gotit'
6233 * set. In the former case, we must reset the
6234 * curr_prompt variable.
6238 } else if (pktin
->type
== SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ
) {
6239 /* FIXME: perhaps we should support this? */
6240 bombout(("PASSWD_CHANGEREQ not yet supported"));
6242 } else if (pktin
->type
!= SSH2_MSG_USERAUTH_FAILURE
) {
6243 bombout(("Strange packet received during authentication: type %d",
6251 * OK, we're now sitting on a USERAUTH_FAILURE message, so
6252 * we can look at the string in it and know what we can
6253 * helpfully try next.
6255 if (pktin
->type
== SSH2_MSG_USERAUTH_FAILURE
) {
6258 ssh_pkt_getstring(pktin
, &methods
, &methlen
);
6259 s
->kbd_inter_running
= FALSE
;
6260 if (!ssh2_pkt_getbool(pktin
)) {
6262 * We have received an unequivocal Access
6263 * Denied. This can translate to a variety of
6266 * - if we'd just tried "none" authentication,
6267 * it's not worth printing anything at all
6269 * - if we'd just tried a public key _offer_,
6270 * the message should be "Server refused our
6271 * key" (or no message at all if the key
6272 * came from Pageant)
6274 * - if we'd just tried anything else, the
6275 * message really should be "Access denied".
6277 * Additionally, if we'd just tried password
6278 * authentication, we should break out of this
6279 * whole loop so as to go back to the username
6280 * prompt (iff we're configured to allow
6281 * username change attempts).
6283 if (s
->type
== AUTH_TYPE_NONE
) {
6285 } else if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
||
6286 s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_QUIET
) {
6287 if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
)
6288 c_write_str(ssh
, "Server refused our key\r\n");
6289 logevent("Server refused public key");
6290 } else if (s
->type
==AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
) {
6291 /* server declined keyboard-interactive; ignore */
6293 c_write_str(ssh
, "Access denied\r\n");
6294 logevent("Access denied");
6295 if (s
->type
== AUTH_TYPE_PASSWORD
&&
6296 ssh
->cfg
.change_username
) {
6297 /* XXX perhaps we should allow
6298 * keyboard-interactive to do this too? */
6299 s
->we_are_in
= FALSE
;
6304 c_write_str(ssh
, "Further authentication required\r\n");
6305 logevent("Further authentication required");
6309 in_commasep_string("publickey", methods
, methlen
);
6311 in_commasep_string("password", methods
, methlen
);
6312 s
->can_keyb_inter
= ssh
->cfg
.try_ki_auth
&&
6313 in_commasep_string("keyboard-interactive", methods
, methlen
);
6317 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6321 * Most password/passphrase prompts will be
6322 * non-echoing, so we set this to 0 by default.
6323 * Exception is that some keyboard-interactive prompts
6324 * can be echoing, in which case we'll set this to 1.
6328 if (!s
->method
&& s
->can_pubkey
&&
6329 agent_exists() && !s
->tried_agent
) {
6331 * Attempt public-key authentication using Pageant.
6336 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6337 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
6339 s
->tried_agent
= TRUE
;
6341 logevent("Pageant is running. Requesting keys.");
6343 /* Request the keys held by the agent. */
6344 PUT_32BIT(s
->request
, 1);
6345 s
->request
[4] = SSH2_AGENTC_REQUEST_IDENTITIES
;
6346 if (!agent_query(s
->request
, 5, &r
, &s
->responselen
,
6347 ssh_agent_callback
, ssh
)) {
6351 bombout(("Unexpected data from server while"
6352 " waiting for agent response"));
6355 } while (pktin
|| inlen
> 0);
6356 r
= ssh
->agent_response
;
6357 s
->responselen
= ssh
->agent_response_len
;
6359 s
->response
= (unsigned char *) r
;
6360 if (s
->response
&& s
->responselen
>= 5 &&
6361 s
->response
[4] == SSH2_AGENT_IDENTITIES_ANSWER
) {
6362 s
->p
= s
->response
+ 5;
6363 s
->nkeys
= GET_32BIT(s
->p
);
6365 logeventf(ssh
, "Pageant has %d SSH2 keys", s
->nkeys
);
6366 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
6369 logeventf(ssh
, "Trying Pageant key #%d", s
->keyi
);
6370 s
->pklen
= GET_32BIT(s
->p
);
6372 if (s
->publickey_blob
&&
6373 s
->pklen
== s
->publickey_bloblen
&&
6374 !memcmp(s
->p
, s
->publickey_blob
,
6375 s
->publickey_bloblen
)) {
6376 logevent("This key matches configured key file");
6377 s
->tried_pubkey_config
= 1;
6379 s
->pkblob
= (char *)s
->p
;
6381 s
->alglen
= GET_32BIT(s
->pkblob
);
6382 s
->alg
= s
->pkblob
+ 4;
6383 s
->commentlen
= GET_32BIT(s
->p
);
6385 s
->commentp
= (char *)s
->p
;
6386 s
->p
+= s
->commentlen
;
6387 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6388 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6389 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6390 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6391 ssh2_pkt_addbool(s
->pktout
, FALSE
); /* no signature included */
6392 ssh2_pkt_addstring_start(s
->pktout
);
6393 ssh2_pkt_addstring_data(s
->pktout
, s
->alg
, s
->alglen
);
6394 ssh2_pkt_addstring_start(s
->pktout
);
6395 ssh2_pkt_addstring_data(s
->pktout
, s
->pkblob
, s
->pklen
);
6396 ssh2_pkt_send(ssh
, s
->pktout
);
6398 crWaitUntilV(pktin
);
6399 if (pktin
->type
!= SSH2_MSG_USERAUTH_PK_OK
) {
6400 logevent("Key refused");
6404 if (flags
& FLAG_VERBOSE
) {
6405 c_write_str(ssh
, "Authenticating with "
6407 c_write(ssh
, s
->commentp
, s
->commentlen
);
6408 c_write_str(ssh
, "\" from agent\r\n");
6412 * Server is willing to accept the key.
6413 * Construct a SIGN_REQUEST.
6415 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6416 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6417 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6418 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6419 ssh2_pkt_addbool(s
->pktout
, TRUE
);
6420 ssh2_pkt_addstring_start(s
->pktout
);
6421 ssh2_pkt_addstring_data(s
->pktout
, s
->alg
, s
->alglen
);
6422 ssh2_pkt_addstring_start(s
->pktout
);
6423 ssh2_pkt_addstring_data(s
->pktout
, s
->pkblob
, s
->pklen
);
6425 s
->siglen
= s
->pktout
->length
- 5 + 4 + 20;
6426 if (ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)
6428 s
->len
= 1; /* message type */
6429 s
->len
+= 4 + s
->pklen
; /* key blob */
6430 s
->len
+= 4 + s
->siglen
; /* data to sign */
6431 s
->len
+= 4; /* flags */
6432 s
->agentreq
= snewn(4 + s
->len
, char);
6433 PUT_32BIT(s
->agentreq
, s
->len
);
6434 s
->q
= s
->agentreq
+ 4;
6435 *s
->q
++ = SSH2_AGENTC_SIGN_REQUEST
;
6436 PUT_32BIT(s
->q
, s
->pklen
);
6438 memcpy(s
->q
, s
->pkblob
, s
->pklen
);
6440 PUT_32BIT(s
->q
, s
->siglen
);
6442 /* Now the data to be signed... */
6443 if (!(ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)) {
6444 PUT_32BIT(s
->q
, 20);
6447 memcpy(s
->q
, ssh
->v2_session_id
, 20);
6449 memcpy(s
->q
, s
->pktout
->data
+ 5,
6450 s
->pktout
->length
- 5);
6451 s
->q
+= s
->pktout
->length
- 5;
6452 /* And finally the (zero) flags word. */
6454 if (!agent_query(s
->agentreq
, s
->len
+ 4,
6456 ssh_agent_callback
, ssh
)) {
6460 bombout(("Unexpected data from server"
6461 " while waiting for agent"
6465 } while (pktin
|| inlen
> 0);
6466 vret
= ssh
->agent_response
;
6467 s
->retlen
= ssh
->agent_response_len
;
6472 if (s
->ret
[4] == SSH2_AGENT_SIGN_RESPONSE
) {
6473 logevent("Sending Pageant's response");
6474 ssh2_add_sigblob(ssh
, s
->pktout
,
6475 s
->pkblob
, s
->pklen
,
6477 GET_32BIT(s
->ret
+ 5));
6478 ssh2_pkt_send(ssh
, s
->pktout
);
6483 ("Pageant failed to answer challenge");
6494 if (!s
->method
&& s
->can_pubkey
&& s
->publickey_blob
6495 && !s
->tried_pubkey_config
) {
6496 unsigned char *pub_blob
;
6497 char *algorithm
, *comment
;
6500 s
->tried_pubkey_config
= TRUE
;
6502 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6503 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
6506 * Try the public key supplied in the configuration.
6508 * First, offer the public blob to see if the server is
6509 * willing to accept it.
6512 (unsigned char *)ssh2_userkey_loadpub(&ssh
->cfg
.keyfile
,
6517 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6518 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6519 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6520 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6521 ssh2_pkt_addbool(s
->pktout
, FALSE
); /* no signature included */
6522 ssh2_pkt_addstring(s
->pktout
, algorithm
);
6523 ssh2_pkt_addstring_start(s
->pktout
);
6524 ssh2_pkt_addstring_data(s
->pktout
, (char *)pub_blob
,
6526 ssh2_pkt_send(ssh
, s
->pktout
);
6527 logevent("Offered public key");
6529 crWaitUntilV(pktin
);
6530 if (pktin
->type
!= SSH2_MSG_USERAUTH_PK_OK
) {
6532 s
->type
= AUTH_TYPE_PUBLICKEY_OFFER_LOUD
;
6533 continue; /* key refused; give up on it */
6536 logevent("Offer of public key accepted");
6538 * Actually attempt a serious authentication using
6541 if (ssh2_userkey_encrypted(&ssh
->cfg
.keyfile
, &comment
)) {
6542 sprintf(s
->pwprompt
,
6543 "Passphrase for key \"%.100s\": ",
6549 if (flags
& FLAG_VERBOSE
) {
6550 c_write_str(ssh
, "Authenticating with public key \"");
6551 c_write_str(ssh
, comment
);
6552 c_write_str(ssh
, "\"\r\n");
6554 s
->method
= AUTH_PUBLICKEY_FILE
;
6558 if (!s
->method
&& s
->can_keyb_inter
&& !s
->kbd_inter_refused
&&
6559 !s
->kbd_inter_running
) {
6560 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
6561 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
6563 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6564 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
6566 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6567 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6568 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6569 ssh2_pkt_addstring(s
->pktout
, "keyboard-interactive"); /* method */
6570 ssh2_pkt_addstring(s
->pktout
, ""); /* lang */
6571 ssh2_pkt_addstring(s
->pktout
, "");
6572 ssh2_pkt_send(ssh
, s
->pktout
);
6574 crWaitUntilV(pktin
);
6575 if (pktin
->type
!= SSH2_MSG_USERAUTH_INFO_REQUEST
) {
6576 if (pktin
->type
== SSH2_MSG_USERAUTH_FAILURE
)
6578 logevent("Keyboard-interactive authentication refused");
6579 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
;
6580 s
->kbd_inter_refused
= TRUE
; /* don't try it again */
6584 s
->kbd_inter_running
= TRUE
;
6588 if (s
->kbd_inter_running
) {
6589 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
6590 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
6592 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6593 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
6595 if (s
->curr_prompt
== 0) {
6597 * We've got a fresh USERAUTH_INFO_REQUEST.
6598 * Display header data, and start going through
6601 char *name
, *inst
, *lang
;
6602 int name_len
, inst_len
, lang_len
;
6604 ssh_pkt_getstring(pktin
, &name
, &name_len
);
6605 ssh_pkt_getstring(pktin
, &inst
, &inst_len
);
6606 ssh_pkt_getstring(pktin
, &lang
, &lang_len
);
6608 c_write_untrusted(ssh
, name
, name_len
);
6609 c_write_str(ssh
, "\r\n");
6612 c_write_untrusted(ssh
, inst
, inst_len
);
6613 c_write_str(ssh
, "\r\n");
6615 s
->num_prompts
= ssh_pkt_getuint32(pktin
);
6619 * If there are prompts remaining in the packet,
6620 * display one and get a response.
6622 if (s
->curr_prompt
< s
->num_prompts
) {
6626 ssh_pkt_getstring(pktin
, &prompt
, &prompt_len
);
6627 if (prompt_len
> 0) {
6628 static const char trunc
[] = "<prompt truncated>: ";
6629 static const int prlen
= sizeof(s
->pwprompt
) -
6631 if (prompt_len
> prlen
) {
6632 memcpy(s
->pwprompt
, prompt
, prlen
);
6633 strcpy(s
->pwprompt
+ prlen
, trunc
);
6635 memcpy(s
->pwprompt
, prompt
, prompt_len
);
6636 s
->pwprompt
[prompt_len
] = '\0';
6640 "<server failed to send prompt>: ");
6642 s
->echo
= ssh2_pkt_getbool(pktin
);
6648 if (!s
->method
&& s
->can_passwd
) {
6649 s
->method
= AUTH_PASSWORD
;
6650 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6651 ssh
->pkt_ctx
|= SSH2_PKTCTX_PASSWORD
;
6652 sprintf(s
->pwprompt
, "%.90s@%.90s's password: ", s
->username
,
6659 if (!ssh_get_line(s
->pwprompt
, s
->password
,
6660 sizeof(s
->password
), TRUE
)) {
6662 * get_line failed to get a password (for
6663 * example because one was supplied on the
6664 * command line which has already failed to
6667 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
6668 ssh2_pkt_adduint32(s
->pktout
,SSH2_DISCONNECT_BY_APPLICATION
);
6669 ssh2_pkt_addstring(s
->pktout
, "No more passwords available"
6671 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
6672 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
6673 logevent("Unable to authenticate");
6674 connection_fatal(ssh
->frontend
,
6675 "Unable to authenticate");
6676 ssh
->close_expected
= TRUE
;
6677 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6681 int ret
; /* need not be saved across crReturn */
6682 c_write_untrusted(ssh
, s
->pwprompt
, strlen(s
->pwprompt
));
6685 setup_userpass_input(ssh
, s
->password
,
6686 sizeof(s
->password
), s
->echo
);
6688 crWaitUntilV(!pktin
);
6689 ret
= process_userpass_input(ssh
, in
, inlen
);
6693 c_write_str(ssh
, "\r\n");
6697 if (s
->method
== AUTH_PUBLICKEY_FILE
) {
6699 * We have our passphrase. Now try the actual authentication.
6701 struct ssh2_userkey
*key
;
6702 const char *error
= NULL
;
6704 key
= ssh2_load_userkey(&ssh
->cfg
.keyfile
, s
->password
,
6706 if (key
== SSH2_WRONG_PASSPHRASE
|| key
== NULL
) {
6707 if (key
== SSH2_WRONG_PASSPHRASE
) {
6708 c_write_str(ssh
, "Wrong passphrase\r\n");
6709 s
->tried_pubkey_config
= FALSE
;
6711 c_write_str(ssh
, "Unable to load private key (");
6712 c_write_str(ssh
, error
);
6713 c_write_str(ssh
, ")\r\n");
6714 s
->tried_pubkey_config
= TRUE
;
6716 /* Send a spurious AUTH_NONE to return to the top. */
6717 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6718 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6719 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6720 ssh2_pkt_addstring(s
->pktout
, "none"); /* method */
6721 ssh2_pkt_send(ssh
, s
->pktout
);
6722 s
->type
= AUTH_TYPE_NONE
;
6724 unsigned char *pkblob
, *sigblob
, *sigdata
;
6725 int pkblob_len
, sigblob_len
, sigdata_len
;
6729 * We have loaded the private key and the server
6730 * has announced that it's willing to accept it.
6731 * Hallelujah. Generate a signature and send it.
6733 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6734 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6735 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6736 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6737 ssh2_pkt_addbool(s
->pktout
, TRUE
);
6738 ssh2_pkt_addstring(s
->pktout
, key
->alg
->name
);
6739 pkblob
= key
->alg
->public_blob(key
->data
, &pkblob_len
);
6740 ssh2_pkt_addstring_start(s
->pktout
);
6741 ssh2_pkt_addstring_data(s
->pktout
, (char *)pkblob
, pkblob_len
);
6744 * The data to be signed is:
6748 * followed by everything so far placed in the
6751 sigdata_len
= s
->pktout
->length
- 5 + 4 + 20;
6752 if (ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)
6754 sigdata
= snewn(sigdata_len
, unsigned char);
6756 if (!(ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)) {
6757 PUT_32BIT(sigdata
+p
, 20);
6760 memcpy(sigdata
+p
, ssh
->v2_session_id
, 20); p
+= 20;
6761 memcpy(sigdata
+p
, s
->pktout
->data
+ 5,
6762 s
->pktout
->length
- 5);
6763 p
+= s
->pktout
->length
- 5;
6764 assert(p
== sigdata_len
);
6765 sigblob
= key
->alg
->sign(key
->data
, (char *)sigdata
,
6766 sigdata_len
, &sigblob_len
);
6767 ssh2_add_sigblob(ssh
, s
->pktout
, pkblob
, pkblob_len
,
6768 sigblob
, sigblob_len
);
6773 ssh2_pkt_send(ssh
, s
->pktout
);
6774 s
->type
= AUTH_TYPE_PUBLICKEY
;
6775 key
->alg
->freekey(key
->data
);
6777 } else if (s
->method
== AUTH_PASSWORD
) {
6779 * We pad out the password packet to 256 bytes to make
6780 * it harder for an attacker to find the length of the
6783 * Anyone using a password longer than 256 bytes
6784 * probably doesn't have much to worry about from
6785 * people who find out how long their password is!
6787 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6788 s
->pktout
->forcepad
= 256;
6789 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6790 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6791 ssh2_pkt_addstring(s
->pktout
, "password");
6792 ssh2_pkt_addbool(s
->pktout
, FALSE
);
6793 dont_log_password(ssh
, s
->pktout
, PKTLOG_BLANK
);
6794 ssh2_pkt_addstring(s
->pktout
, s
->password
);
6795 memset(s
->password
, 0, sizeof(s
->password
));
6796 end_log_omission(ssh
, s
->pktout
);
6797 ssh2_pkt_send(ssh
, s
->pktout
);
6798 logevent("Sent password");
6799 s
->type
= AUTH_TYPE_PASSWORD
;
6800 } else if (s
->method
== AUTH_KEYBOARD_INTERACTIVE
) {
6801 if (s
->curr_prompt
== 0) {
6802 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_INFO_RESPONSE
);
6803 s
->pktout
->forcepad
= 256;
6804 ssh2_pkt_adduint32(s
->pktout
, s
->num_prompts
);
6806 if (s
->need_pw
) { /* only add pw if we just got one! */
6807 dont_log_password(ssh
, s
->pktout
, PKTLOG_BLANK
);
6808 ssh2_pkt_addstring(s
->pktout
, s
->password
);
6809 memset(s
->password
, 0, sizeof(s
->password
));
6810 end_log_omission(ssh
, s
->pktout
);
6813 if (s
->curr_prompt
>= s
->num_prompts
) {
6814 ssh2_pkt_send(ssh
, s
->pktout
);
6817 * If there are prompts remaining, we set
6818 * `gotit' so that we won't attempt to get
6819 * another packet. Then we go back round the
6820 * loop and will end up retrieving another
6821 * prompt out of the existing packet. Funky or
6826 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
6828 c_write_str(ssh
, "No supported authentication methods"
6829 " left to try!\r\n");
6830 logevent("No supported authentications offered."
6832 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
6833 ssh2_pkt_adduint32(s
->pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
6834 ssh2_pkt_addstring(s
->pktout
, "No supported authentication"
6835 " methods available");
6836 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
6837 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
6838 ssh
->close_expected
= TRUE
;
6839 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6843 } while (!s
->we_are_in
);
6846 * Now we're authenticated for the connection protocol. The
6847 * connection protocol will automatically have started at this
6848 * point; there's no need to send SERVICE_REQUEST.
6851 ssh
->channels
= newtree234(ssh_channelcmp
);
6854 * Set up handlers for some connection protocol messages, so we
6855 * don't have to handle them repeatedly in this coroutine.
6857 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_WINDOW_ADJUST
] =
6858 ssh2_msg_channel_window_adjust
;
6859 ssh
->packet_dispatch
[SSH2_MSG_GLOBAL_REQUEST
] =
6860 ssh2_msg_global_request
;
6863 * Create the main session channel.
6865 if (!ssh
->cfg
.ssh_no_shell
) {
6866 ssh
->mainchan
= snew(struct ssh_channel
);
6867 ssh
->mainchan
->ssh
= ssh
;
6868 ssh
->mainchan
->localid
= alloc_channel_id(ssh
);
6869 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
6870 ssh2_pkt_addstring(s
->pktout
, "session");
6871 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->localid
);
6872 ssh
->mainchan
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
6873 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->v
.v2
.locwindow
);/* our window size */
6874 ssh2_pkt_adduint32(s
->pktout
, OUR_V2_MAXPKT
); /* our max pkt size */
6875 ssh2_pkt_send(ssh
, s
->pktout
);
6876 crWaitUntilV(pktin
);
6877 if (pktin
->type
!= SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
6878 bombout(("Server refused to open a session"));
6880 /* FIXME: error data comes back in FAILURE packet */
6882 if (ssh_pkt_getuint32(pktin
) != ssh
->mainchan
->localid
) {
6883 bombout(("Server's channel confirmation cited wrong channel"));
6886 ssh
->mainchan
->remoteid
= ssh_pkt_getuint32(pktin
);
6887 ssh
->mainchan
->halfopen
= FALSE
;
6888 ssh
->mainchan
->type
= CHAN_MAINSESSION
;
6889 ssh
->mainchan
->closes
= 0;
6890 ssh
->mainchan
->v
.v2
.remwindow
= ssh_pkt_getuint32(pktin
);
6891 ssh
->mainchan
->v
.v2
.remmaxpkt
= ssh_pkt_getuint32(pktin
);
6892 bufchain_init(&ssh
->mainchan
->v
.v2
.outbuffer
);
6893 add234(ssh
->channels
, ssh
->mainchan
);
6894 update_specials_menu(ssh
->frontend
);
6895 logevent("Opened channel for session");
6897 ssh
->mainchan
= NULL
;
6900 * Now we have a channel, make dispatch table entries for
6901 * general channel-based messages.
6903 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_DATA
] =
6904 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EXTENDED_DATA
] =
6905 ssh2_msg_channel_data
;
6906 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EOF
] = ssh2_msg_channel_eof
;
6907 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_CLOSE
] = ssh2_msg_channel_close
;
6908 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
] =
6909 ssh2_msg_channel_open_confirmation
;
6910 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_FAILURE
] =
6911 ssh2_msg_channel_open_failure
;
6912 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_REQUEST
] =
6913 ssh2_msg_channel_request
;
6914 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN
] =
6915 ssh2_msg_channel_open
;
6918 * Potentially enable X11 forwarding.
6920 if (ssh
->mainchan
&& ssh
->cfg
.x11_forward
) {
6921 char proto
[20], data
[64];
6922 logevent("Requesting X11 forwarding");
6923 ssh
->x11auth
= x11_invent_auth(proto
, sizeof(proto
),
6924 data
, sizeof(data
), ssh
->cfg
.x11_auth
);
6925 x11_get_real_auth(ssh
->x11auth
, ssh
->cfg
.x11_display
);
6926 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
6927 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
6928 ssh2_pkt_addstring(s
->pktout
, "x11-req");
6929 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6930 ssh2_pkt_addbool(s
->pktout
, 0); /* many connections */
6931 ssh2_pkt_addstring(s
->pktout
, proto
);
6932 ssh2_pkt_addstring(s
->pktout
, data
);
6933 ssh2_pkt_adduint32(s
->pktout
, x11_get_screen_number(ssh
->cfg
.x11_display
));
6934 ssh2_pkt_send(ssh
, s
->pktout
);
6936 crWaitUntilV(pktin
);
6938 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
6939 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
6940 bombout(("Unexpected response to X11 forwarding request:"
6941 " packet type %d", pktin
->type
));
6944 logevent("X11 forwarding refused");
6946 logevent("X11 forwarding enabled");
6947 ssh
->X11_fwd_enabled
= TRUE
;
6952 * Enable port forwardings.
6954 ssh_setup_portfwd(ssh
, &ssh
->cfg
);
6957 * Potentially enable agent forwarding.
6959 if (ssh
->mainchan
&& ssh
->cfg
.agentfwd
&& agent_exists()) {
6960 logevent("Requesting OpenSSH-style agent forwarding");
6961 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
6962 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
6963 ssh2_pkt_addstring(s
->pktout
, "auth-agent-req@openssh.com");
6964 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6965 ssh2_pkt_send(ssh
, s
->pktout
);
6967 crWaitUntilV(pktin
);
6969 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
6970 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
6971 bombout(("Unexpected response to agent forwarding request:"
6972 " packet type %d", pktin
->type
));
6975 logevent("Agent forwarding refused");
6977 logevent("Agent forwarding enabled");
6978 ssh
->agentfwd_enabled
= TRUE
;
6983 * Now allocate a pty for the session.
6985 if (ssh
->mainchan
&& !ssh
->cfg
.nopty
) {
6986 /* Unpick the terminal-speed string. */
6987 /* XXX perhaps we should allow no speeds to be sent. */
6988 ssh
->ospeed
= 38400; ssh
->ispeed
= 38400; /* last-resort defaults */
6989 sscanf(ssh
->cfg
.termspeed
, "%d,%d", &ssh
->ospeed
, &ssh
->ispeed
);
6990 /* Build the pty request. */
6991 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
6992 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
); /* recipient channel */
6993 ssh2_pkt_addstring(s
->pktout
, "pty-req");
6994 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6995 ssh2_pkt_addstring(s
->pktout
, ssh
->cfg
.termtype
);
6996 ssh2_pkt_adduint32(s
->pktout
, ssh
->term_width
);
6997 ssh2_pkt_adduint32(s
->pktout
, ssh
->term_height
);
6998 ssh2_pkt_adduint32(s
->pktout
, 0); /* pixel width */
6999 ssh2_pkt_adduint32(s
->pktout
, 0); /* pixel height */
7000 ssh2_pkt_addstring_start(s
->pktout
);
7001 ssh2_pkt_addbyte(s
->pktout
, 128); /* TTY_OP_ISPEED */
7002 ssh2_pkt_adduint32(s
->pktout
, ssh
->ispeed
);
7003 ssh2_pkt_addbyte(s
->pktout
, 129); /* TTY_OP_OSPEED */
7004 ssh2_pkt_adduint32(s
->pktout
, ssh
->ospeed
);
7005 ssh2_pkt_addstring_data(s
->pktout
, "\0", 1); /* TTY_OP_END */
7006 ssh2_pkt_send(ssh
, s
->pktout
);
7007 ssh
->state
= SSH_STATE_INTERMED
;
7009 crWaitUntilV(pktin
);
7011 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
7012 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
7013 bombout(("Unexpected response to pty request:"
7014 " packet type %d", pktin
->type
));
7017 c_write_str(ssh
, "Server refused to allocate pty\r\n");
7018 ssh
->editing
= ssh
->echoing
= 1;
7020 logeventf(ssh
, "Allocated pty (ospeed %dbps, ispeed %dbps)",
7021 ssh
->ospeed
, ssh
->ispeed
);
7024 ssh
->editing
= ssh
->echoing
= 1;
7028 * Send environment variables.
7030 * Simplest thing here is to send all the requests at once, and
7031 * then wait for a whole bunch of successes or failures.
7033 if (ssh
->mainchan
&& *ssh
->cfg
.environmt
) {
7034 char *e
= ssh
->cfg
.environmt
;
7035 char *var
, *varend
, *val
;
7041 while (*e
&& *e
!= '\t') e
++;
7043 if (*e
== '\t') e
++;
7048 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7049 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
7050 ssh2_pkt_addstring(s
->pktout
, "env");
7051 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7052 ssh2_pkt_addstring_start(s
->pktout
);
7053 ssh2_pkt_addstring_data(s
->pktout
, var
, varend
-var
);
7054 ssh2_pkt_addstring(s
->pktout
, val
);
7055 ssh2_pkt_send(ssh
, s
->pktout
);
7060 logeventf(ssh
, "Sent %d environment variables", s
->num_env
);
7063 s
->env_left
= s
->num_env
;
7065 while (s
->env_left
> 0) {
7066 crWaitUntilV(pktin
);
7068 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
7069 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
7070 bombout(("Unexpected response to environment request:"
7071 " packet type %d", pktin
->type
));
7081 if (s
->env_ok
== s
->num_env
) {
7082 logevent("All environment variables successfully set");
7083 } else if (s
->env_ok
== 0) {
7084 logevent("All environment variables refused");
7085 c_write_str(ssh
, "Server refused to set environment variables\r\n");
7087 logeventf(ssh
, "%d environment variables refused",
7088 s
->num_env
- s
->env_ok
);
7089 c_write_str(ssh
, "Server refused to set all environment variables\r\n");
7094 * Start a shell or a remote command. We may have to attempt
7095 * this twice if the config data has provided a second choice
7098 if (ssh
->mainchan
) while (1) {
7102 if (ssh
->fallback_cmd
) {
7103 subsys
= ssh
->cfg
.ssh_subsys2
;
7104 cmd
= ssh
->cfg
.remote_cmd_ptr2
;
7106 subsys
= ssh
->cfg
.ssh_subsys
;
7107 cmd
= ssh
->cfg
.remote_cmd_ptr
;
7110 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7111 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
); /* recipient channel */
7113 ssh2_pkt_addstring(s
->pktout
, "subsystem");
7114 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7115 ssh2_pkt_addstring(s
->pktout
, cmd
);
7117 ssh2_pkt_addstring(s
->pktout
, "exec");
7118 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7119 ssh2_pkt_addstring(s
->pktout
, cmd
);
7121 ssh2_pkt_addstring(s
->pktout
, "shell");
7122 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7124 ssh2_pkt_send(ssh
, s
->pktout
);
7126 crWaitUntilV(pktin
);
7128 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
7129 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
7130 bombout(("Unexpected response to shell/command request:"
7131 " packet type %d", pktin
->type
));
7135 * We failed to start the command. If this is the
7136 * fallback command, we really are finished; if it's
7137 * not, and if the fallback command exists, try falling
7138 * back to it before complaining.
7140 if (!ssh
->fallback_cmd
&& ssh
->cfg
.remote_cmd_ptr2
!= NULL
) {
7141 logevent("Primary command failed; attempting fallback");
7142 ssh
->fallback_cmd
= TRUE
;
7145 bombout(("Server refused to start a shell/command"));
7148 logevent("Started a shell/command");
7153 ssh
->state
= SSH_STATE_SESSION
;
7154 if (ssh
->size_needed
)
7155 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
7156 if (ssh
->eof_needed
)
7157 ssh_special(ssh
, TS_EOF
);
7163 ldisc_send(ssh
->ldisc
, NULL
, 0, 0);/* cause ldisc to notice changes */
7168 s
->try_send
= FALSE
;
7172 * _All_ the connection-layer packets we expect to
7173 * receive are now handled by the dispatch table.
7174 * Anything that reaches here must be bogus.
7177 bombout(("Strange packet received: type %d", pktin
->type
));
7179 } else if (ssh
->mainchan
) {
7181 * We have spare data. Add it to the channel buffer.
7183 ssh2_add_channel_data(ssh
->mainchan
, (char *)in
, inlen
);
7188 struct ssh_channel
*c
;
7190 * Try to send data on all channels if we can.
7192 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
7195 continue; /* don't send on closing channels */
7196 bufsize
= ssh2_try_send(c
);
7199 case CHAN_MAINSESSION
:
7200 /* stdin need not receive an unthrottle
7201 * notification since it will be polled */
7204 x11_unthrottle(c
->u
.x11
.s
);
7207 /* agent sockets are request/response and need no
7208 * buffer management */
7211 pfd_unthrottle(c
->u
.pfd
.s
);
7223 * Handlers for SSH2 messages that might arrive at any moment.
7225 static void ssh2_msg_disconnect(Ssh ssh
, struct Packet
*pktin
)
7227 /* log reason code in disconnect message */
7229 int nowlen
, reason
, msglen
;
7231 reason
= ssh_pkt_getuint32(pktin
);
7232 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
7234 if (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) {
7235 buf
= dupprintf("Received disconnect message (%s)",
7236 ssh2_disconnect_reasons
[reason
]);
7238 buf
= dupprintf("Received disconnect message (unknown"
7239 " type %d)", reason
);
7243 buf
= dupprintf("Disconnection message text: %n%.*s",
7244 &nowlen
, msglen
, msg
);
7246 bombout(("Server sent disconnect message\ntype %d (%s):\n\"%s\"",
7248 (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) ?
7249 ssh2_disconnect_reasons
[reason
] : "unknown",
7254 static void ssh2_msg_debug(Ssh ssh
, struct Packet
*pktin
)
7256 /* log the debug message */
7261 /* XXX maybe we should actually take notice of this */
7262 always_display
= ssh2_pkt_getbool(pktin
);
7263 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
7265 logeventf(ssh
, "Remote debug message: %.*s", msglen
, msg
);
7268 static void ssh2_msg_something_unimplemented(Ssh ssh
, struct Packet
*pktin
)
7270 struct Packet
*pktout
;
7271 pktout
= ssh2_pkt_init(SSH2_MSG_UNIMPLEMENTED
);
7272 ssh2_pkt_adduint32(pktout
, pktin
->sequence
);
7274 * UNIMPLEMENTED messages MUST appear in the same order as the
7275 * messages they respond to. Hence, never queue them.
7277 ssh2_pkt_send_noqueue(ssh
, pktout
);
7281 * Handle the top-level SSH2 protocol.
7283 static void ssh2_protocol_setup(Ssh ssh
)
7288 * Most messages cause SSH2_MSG_UNIMPLEMENTED.
7290 for (i
= 0; i
< 256; i
++)
7291 ssh
->packet_dispatch
[i
] = ssh2_msg_something_unimplemented
;
7294 * Any message we actually understand, we set to NULL so that
7295 * the coroutines will get it.
7297 ssh
->packet_dispatch
[SSH2_MSG_UNIMPLEMENTED
] = NULL
;
7298 ssh
->packet_dispatch
[SSH2_MSG_SERVICE_REQUEST
] = NULL
;
7299 ssh
->packet_dispatch
[SSH2_MSG_SERVICE_ACCEPT
] = NULL
;
7300 ssh
->packet_dispatch
[SSH2_MSG_KEXINIT
] = NULL
;
7301 ssh
->packet_dispatch
[SSH2_MSG_NEWKEYS
] = NULL
;
7302 ssh
->packet_dispatch
[SSH2_MSG_KEXDH_INIT
] = NULL
;
7303 ssh
->packet_dispatch
[SSH2_MSG_KEXDH_REPLY
] = NULL
;
7304 /* ssh->packet_dispatch[SSH2_MSG_KEX_DH_GEX_REQUEST] = NULL; duplicate case value */
7305 /* ssh->packet_dispatch[SSH2_MSG_KEX_DH_GEX_GROUP] = NULL; duplicate case value */
7306 ssh
->packet_dispatch
[SSH2_MSG_KEX_DH_GEX_INIT
] = NULL
;
7307 ssh
->packet_dispatch
[SSH2_MSG_KEX_DH_GEX_REPLY
] = NULL
;
7308 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_REQUEST
] = NULL
;
7309 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_FAILURE
] = NULL
;
7310 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_SUCCESS
] = NULL
;
7311 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_BANNER
] = NULL
;
7312 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_PK_OK
] = NULL
;
7313 /* ssh->packet_dispatch[SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ] = NULL; duplicate case value */
7314 /* ssh->packet_dispatch[SSH2_MSG_USERAUTH_INFO_REQUEST] = NULL; duplicate case value */
7315 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_INFO_RESPONSE
] = NULL
;
7316 ssh
->packet_dispatch
[SSH2_MSG_GLOBAL_REQUEST
] = NULL
;
7317 ssh
->packet_dispatch
[SSH2_MSG_REQUEST_SUCCESS
] = NULL
;
7318 ssh
->packet_dispatch
[SSH2_MSG_REQUEST_FAILURE
] = NULL
;
7319 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN
] = NULL
;
7320 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
] = NULL
;
7321 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_FAILURE
] = NULL
;
7322 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_WINDOW_ADJUST
] = NULL
;
7323 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_DATA
] = NULL
;
7324 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EXTENDED_DATA
] = NULL
;
7325 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EOF
] = NULL
;
7326 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_CLOSE
] = NULL
;
7327 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_REQUEST
] = NULL
;
7328 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_SUCCESS
] = NULL
;
7329 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_FAILURE
] = NULL
;
7332 * These special message types we install handlers for.
7334 ssh
->packet_dispatch
[SSH2_MSG_DISCONNECT
] = ssh2_msg_disconnect
;
7335 ssh
->packet_dispatch
[SSH2_MSG_IGNORE
] = ssh_msg_ignore
; /* shared with ssh1 */
7336 ssh
->packet_dispatch
[SSH2_MSG_DEBUG
] = ssh2_msg_debug
;
7339 static void ssh2_timer(void *ctx
, long now
)
7343 if (!ssh
->kex_in_progress
&& ssh
->cfg
.ssh_rekey_time
!= 0 &&
7344 now
- ssh
->next_rekey
>= 0) {
7345 do_ssh2_transport(ssh
, "timeout", -1, NULL
);
7349 static void ssh2_protocol(Ssh ssh
, void *vin
, int inlen
,
7350 struct Packet
*pktin
)
7352 unsigned char *in
= (unsigned char *)vin
;
7353 if (ssh
->state
== SSH_STATE_CLOSED
)
7357 ssh
->incoming_data_size
+= pktin
->encrypted_len
;
7358 if (!ssh
->kex_in_progress
&&
7359 ssh
->max_data_size
!= 0 &&
7360 ssh
->incoming_data_size
> ssh
->max_data_size
)
7361 do_ssh2_transport(ssh
, "too much data received", -1, NULL
);
7364 if (pktin
&& ssh
->packet_dispatch
[pktin
->type
]) {
7365 ssh
->packet_dispatch
[pktin
->type
](ssh
, pktin
);
7369 if (!ssh
->protocol_initial_phase_done
||
7370 (pktin
&& pktin
->type
>= 20 && pktin
->type
< 50)) {
7371 if (do_ssh2_transport(ssh
, in
, inlen
, pktin
) &&
7372 !ssh
->protocol_initial_phase_done
) {
7373 ssh
->protocol_initial_phase_done
= TRUE
;
7375 * Allow authconn to initialise itself.
7377 do_ssh2_authconn(ssh
, NULL
, 0, NULL
);
7380 do_ssh2_authconn(ssh
, in
, inlen
, pktin
);
7385 * Called to set up the connection.
7387 * Returns an error message, or NULL on success.
7389 static const char *ssh_init(void *frontend_handle
, void **backend_handle
,
7391 char *host
, int port
, char **realhost
, int nodelay
,
7397 ssh
= snew(struct ssh_tag
);
7398 ssh
->cfg
= *cfg
; /* STRUCTURE COPY */
7399 ssh
->version
= 0; /* when not ready yet */
7402 ssh
->v1_cipher_ctx
= NULL
;
7403 ssh
->crcda_ctx
= NULL
;
7404 ssh
->cscipher
= NULL
;
7405 ssh
->cs_cipher_ctx
= NULL
;
7406 ssh
->sccipher
= NULL
;
7407 ssh
->sc_cipher_ctx
= NULL
;
7409 ssh
->cs_mac_ctx
= NULL
;
7411 ssh
->sc_mac_ctx
= NULL
;
7413 ssh
->cs_comp_ctx
= NULL
;
7415 ssh
->sc_comp_ctx
= NULL
;
7417 ssh
->kex_ctx
= NULL
;
7418 ssh
->hostkey
= NULL
;
7420 ssh
->close_expected
= FALSE
;
7421 ssh
->state
= SSH_STATE_PREPACKET
;
7422 ssh
->size_needed
= FALSE
;
7423 ssh
->eof_needed
= FALSE
;
7426 ssh
->deferred_send_data
= NULL
;
7427 ssh
->deferred_len
= 0;
7428 ssh
->deferred_size
= 0;
7429 ssh
->fallback_cmd
= 0;
7431 ssh
->x11auth
= NULL
;
7432 ssh
->v1_compressing
= FALSE
;
7433 ssh
->v2_outgoing_sequence
= 0;
7434 ssh
->ssh1_rdpkt_crstate
= 0;
7435 ssh
->ssh2_rdpkt_crstate
= 0;
7436 ssh
->do_ssh_init_crstate
= 0;
7437 ssh
->ssh_gotdata_crstate
= 0;
7438 ssh
->do_ssh1_connection_crstate
= 0;
7439 ssh
->do_ssh1_login_crstate
= 0;
7440 ssh
->do_ssh2_transport_crstate
= 0;
7441 ssh
->do_ssh2_authconn_crstate
= 0;
7442 ssh
->do_ssh_init_state
= NULL
;
7443 ssh
->do_ssh1_login_state
= NULL
;
7444 ssh
->do_ssh2_transport_state
= NULL
;
7445 ssh
->do_ssh2_authconn_state
= NULL
;
7446 ssh
->mainchan
= NULL
;
7447 ssh
->throttled_all
= 0;
7448 ssh
->v1_stdout_throttling
= 0;
7450 ssh
->queuelen
= ssh
->queuesize
= 0;
7451 ssh
->queueing
= FALSE
;
7452 ssh
->qhead
= ssh
->qtail
= NULL
;
7453 ssh
->deferred_rekey_reason
= NULL
;
7455 *backend_handle
= ssh
;
7458 if (crypto_startup() == 0)
7459 return "Microsoft high encryption pack not installed!";
7462 ssh
->frontend
= frontend_handle
;
7463 ssh
->term_width
= ssh
->cfg
.width
;
7464 ssh
->term_height
= ssh
->cfg
.height
;
7466 ssh
->channels
= NULL
;
7467 ssh
->rportfwds
= NULL
;
7468 ssh
->portfwds
= NULL
;
7473 ssh
->v1_throttle_count
= 0;
7474 ssh
->overall_bufsize
= 0;
7475 ssh
->fallback_cmd
= 0;
7477 ssh
->protocol
= NULL
;
7479 ssh
->protocol_initial_phase_done
= FALSE
;
7483 ssh
->incoming_data_size
= ssh
->outgoing_data_size
=
7484 ssh
->deferred_data_size
= 0L;
7485 ssh
->max_data_size
= parse_blocksize(ssh
->cfg
.ssh_rekey_data
);
7486 ssh
->kex_in_progress
= FALSE
;
7488 p
= connect_to_host(ssh
, host
, port
, realhost
, nodelay
, keepalive
);
7497 static void ssh_free(void *handle
)
7499 Ssh ssh
= (Ssh
) handle
;
7500 struct ssh_channel
*c
;
7501 struct ssh_rportfwd
*pf
;
7503 if (ssh
->v1_cipher_ctx
)
7504 ssh
->cipher
->free_context(ssh
->v1_cipher_ctx
);
7505 if (ssh
->cs_cipher_ctx
)
7506 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
7507 if (ssh
->sc_cipher_ctx
)
7508 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
7509 if (ssh
->cs_mac_ctx
)
7510 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
7511 if (ssh
->sc_mac_ctx
)
7512 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
7513 if (ssh
->cs_comp_ctx
) {
7515 ssh
->cscomp
->compress_cleanup(ssh
->cs_comp_ctx
);
7517 zlib_compress_cleanup(ssh
->cs_comp_ctx
);
7519 if (ssh
->sc_comp_ctx
) {
7521 ssh
->sccomp
->decompress_cleanup(ssh
->sc_comp_ctx
);
7523 zlib_decompress_cleanup(ssh
->sc_comp_ctx
);
7526 dh_cleanup(ssh
->kex_ctx
);
7527 sfree(ssh
->savedhost
);
7529 while (ssh
->queuelen
-- > 0)
7530 ssh_free_packet(ssh
->queue
[ssh
->queuelen
]);
7533 while (ssh
->qhead
) {
7534 struct queued_handler
*qh
= ssh
->qhead
;
7535 ssh
->qhead
= qh
->next
;
7538 ssh
->qhead
= ssh
->qtail
= NULL
;
7540 if (ssh
->channels
) {
7541 while ((c
= delpos234(ssh
->channels
, 0)) != NULL
) {
7544 if (c
->u
.x11
.s
!= NULL
)
7545 x11_close(c
->u
.x11
.s
);
7548 if (c
->u
.pfd
.s
!= NULL
)
7549 pfd_close(c
->u
.pfd
.s
);
7554 freetree234(ssh
->channels
);
7555 ssh
->channels
= NULL
;
7558 if (ssh
->rportfwds
) {
7559 while ((pf
= delpos234(ssh
->rportfwds
, 0)) != NULL
)
7561 freetree234(ssh
->rportfwds
);
7562 ssh
->rportfwds
= NULL
;
7564 sfree(ssh
->deferred_send_data
);
7566 x11_free_auth(ssh
->x11auth
);
7567 sfree(ssh
->do_ssh_init_state
);
7568 sfree(ssh
->do_ssh1_login_state
);
7569 sfree(ssh
->do_ssh2_transport_state
);
7570 sfree(ssh
->do_ssh2_authconn_state
);
7571 if (ssh
->crcda_ctx
) {
7572 crcda_free_context(ssh
->crcda_ctx
);
7573 ssh
->crcda_ctx
= NULL
;
7576 ssh_do_close(ssh
, TRUE
);
7577 expire_timer_context(ssh
);
7579 pinger_free(ssh
->pinger
);
7586 * Reconfigure the SSH backend.
7588 static void ssh_reconfig(void *handle
, Config
*cfg
)
7590 Ssh ssh
= (Ssh
) handle
;
7591 char *rekeying
= NULL
, rekey_mandatory
= FALSE
;
7592 unsigned long old_max_data_size
;
7594 pinger_reconfig(ssh
->pinger
, &ssh
->cfg
, cfg
);
7595 ssh_setup_portfwd(ssh
, cfg
);
7597 if (ssh
->cfg
.ssh_rekey_time
!= cfg
->ssh_rekey_time
&&
7598 cfg
->ssh_rekey_time
!= 0) {
7599 long new_next
= ssh
->last_rekey
+ cfg
->ssh_rekey_time
*60*TICKSPERSEC
;
7600 long now
= GETTICKCOUNT();
7602 if (new_next
- now
< 0) {
7603 rekeying
= "timeout shortened";
7605 ssh
->next_rekey
= schedule_timer(new_next
- now
, ssh2_timer
, ssh
);
7609 old_max_data_size
= ssh
->max_data_size
;
7610 ssh
->max_data_size
= parse_blocksize(cfg
->ssh_rekey_data
);
7611 if (old_max_data_size
!= ssh
->max_data_size
&&
7612 ssh
->max_data_size
!= 0) {
7613 if (ssh
->outgoing_data_size
> ssh
->max_data_size
||
7614 ssh
->incoming_data_size
> ssh
->max_data_size
)
7615 rekeying
= "data limit lowered";
7618 if (ssh
->cfg
.compression
!= cfg
->compression
) {
7619 rekeying
= "compression setting changed";
7620 rekey_mandatory
= TRUE
;
7623 if (ssh
->cfg
.ssh2_des_cbc
!= cfg
->ssh2_des_cbc
||
7624 memcmp(ssh
->cfg
.ssh_cipherlist
, cfg
->ssh_cipherlist
,
7625 sizeof(ssh
->cfg
.ssh_cipherlist
))) {
7626 rekeying
= "cipher settings changed";
7627 rekey_mandatory
= TRUE
;
7630 ssh
->cfg
= *cfg
; /* STRUCTURE COPY */
7633 if (!ssh
->kex_in_progress
) {
7634 do_ssh2_transport(ssh
, rekeying
, -1, NULL
);
7635 } else if (rekey_mandatory
) {
7636 ssh
->deferred_rekey_reason
= rekeying
;
7642 * Called to send data down the Telnet connection.
7644 static int ssh_send(void *handle
, char *buf
, int len
)
7646 Ssh ssh
= (Ssh
) handle
;
7648 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
7651 ssh
->protocol(ssh
, (unsigned char *)buf
, len
, 0);
7653 return ssh_sendbuffer(ssh
);
7657 * Called to query the current amount of buffered stdin data.
7659 static int ssh_sendbuffer(void *handle
)
7661 Ssh ssh
= (Ssh
) handle
;
7664 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
7668 * If the SSH socket itself has backed up, add the total backup
7669 * size on that to any individual buffer on the stdin channel.
7672 if (ssh
->throttled_all
)
7673 override_value
= ssh
->overall_bufsize
;
7675 if (ssh
->version
== 1) {
7676 return override_value
;
7677 } else if (ssh
->version
== 2) {
7678 if (!ssh
->mainchan
|| ssh
->mainchan
->closes
> 0)
7679 return override_value
;
7681 return (override_value
+
7682 bufchain_size(&ssh
->mainchan
->v
.v2
.outbuffer
));
7689 * Called to set the size of the window from SSH's POV.
7691 static void ssh_size(void *handle
, int width
, int height
)
7693 Ssh ssh
= (Ssh
) handle
;
7694 struct Packet
*pktout
;
7696 ssh
->term_width
= width
;
7697 ssh
->term_height
= height
;
7699 switch (ssh
->state
) {
7700 case SSH_STATE_BEFORE_SIZE
:
7701 case SSH_STATE_PREPACKET
:
7702 case SSH_STATE_CLOSED
:
7703 break; /* do nothing */
7704 case SSH_STATE_INTERMED
:
7705 ssh
->size_needed
= TRUE
; /* buffer for later */
7707 case SSH_STATE_SESSION
:
7708 if (!ssh
->cfg
.nopty
) {
7709 if (ssh
->version
== 1) {
7710 send_packet(ssh
, SSH1_CMSG_WINDOW_SIZE
,
7711 PKT_INT
, ssh
->term_height
,
7712 PKT_INT
, ssh
->term_width
,
7713 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
7714 } else if (ssh
->mainchan
) {
7715 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7716 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
7717 ssh2_pkt_addstring(pktout
, "window-change");
7718 ssh2_pkt_addbool(pktout
, 0);
7719 ssh2_pkt_adduint32(pktout
, ssh
->term_width
);
7720 ssh2_pkt_adduint32(pktout
, ssh
->term_height
);
7721 ssh2_pkt_adduint32(pktout
, 0);
7722 ssh2_pkt_adduint32(pktout
, 0);
7723 ssh2_pkt_send(ssh
, pktout
);
7731 * Return a list of the special codes that make sense in this
7734 static const struct telnet_special
*ssh_get_specials(void *handle
)
7736 static const struct telnet_special ssh1_ignore_special
[] = {
7737 {"IGNORE message", TS_NOP
}
7739 static const struct telnet_special ssh2_transport_specials
[] = {
7740 {"IGNORE message", TS_NOP
},
7741 {"Repeat key exchange", TS_REKEY
},
7743 static const struct telnet_special ssh2_session_specials
[] = {
7746 /* These are the signal names defined by draft-ietf-secsh-connect-23.
7747 * They include all the ISO C signals, but are a subset of the POSIX
7748 * required signals. */
7749 {"SIGINT (Interrupt)", TS_SIGINT
},
7750 {"SIGTERM (Terminate)", TS_SIGTERM
},
7751 {"SIGKILL (Kill)", TS_SIGKILL
},
7752 {"SIGQUIT (Quit)", TS_SIGQUIT
},
7753 {"SIGHUP (Hangup)", TS_SIGHUP
},
7754 {"More signals", TS_SUBMENU
},
7755 {"SIGABRT", TS_SIGABRT
}, {"SIGALRM", TS_SIGALRM
},
7756 {"SIGFPE", TS_SIGFPE
}, {"SIGILL", TS_SIGILL
},
7757 {"SIGPIPE", TS_SIGPIPE
}, {"SIGSEGV", TS_SIGSEGV
},
7758 {"SIGUSR1", TS_SIGUSR1
}, {"SIGUSR2", TS_SIGUSR2
},
7761 static const struct telnet_special specials_end
[] = {
7764 /* XXX review this length for any changes: */
7765 static struct telnet_special ssh_specials
[lenof(ssh2_transport_specials
) +
7766 lenof(ssh2_session_specials
) +
7767 lenof(specials_end
)];
7768 Ssh ssh
= (Ssh
) handle
;
7770 #define ADD_SPECIALS(name) \
7772 assert((i + lenof(name)) <= lenof(ssh_specials)); \
7773 memcpy(&ssh_specials[i], name, sizeof name); \
7777 if (ssh
->version
== 1) {
7778 /* Don't bother offering IGNORE if we've decided the remote
7779 * won't cope with it, since we wouldn't bother sending it if
7781 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
))
7782 ADD_SPECIALS(ssh1_ignore_special
);
7783 } else if (ssh
->version
== 2) {
7784 ADD_SPECIALS(ssh2_transport_specials
);
7786 ADD_SPECIALS(ssh2_session_specials
);
7787 } /* else we're not ready yet */
7790 ADD_SPECIALS(specials_end
);
7791 return ssh_specials
;
7799 * Send Telnet special codes. TS_EOF is useful for `plink', so you
7800 * can send an EOF and collect resulting output (e.g. `plink
7803 static void ssh_special(void *handle
, Telnet_Special code
)
7805 Ssh ssh
= (Ssh
) handle
;
7806 struct Packet
*pktout
;
7808 if (code
== TS_EOF
) {
7809 if (ssh
->state
!= SSH_STATE_SESSION
) {
7811 * Buffer the EOF in case we are pre-SESSION, so we can
7812 * send it as soon as we reach SESSION.
7815 ssh
->eof_needed
= TRUE
;
7818 if (ssh
->version
== 1) {
7819 send_packet(ssh
, SSH1_CMSG_EOF
, PKT_END
);
7820 } else if (ssh
->mainchan
) {
7821 struct Packet
*pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF
);
7822 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
7823 ssh2_pkt_send(ssh
, pktout
);
7825 logevent("Sent EOF message");
7826 } else if (code
== TS_PING
|| code
== TS_NOP
) {
7827 if (ssh
->state
== SSH_STATE_CLOSED
7828 || ssh
->state
== SSH_STATE_PREPACKET
) return;
7829 if (ssh
->version
== 1) {
7830 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
))
7831 send_packet(ssh
, SSH1_MSG_IGNORE
, PKT_STR
, "", PKT_END
);
7833 pktout
= ssh2_pkt_init(SSH2_MSG_IGNORE
);
7834 ssh2_pkt_addstring_start(pktout
);
7835 ssh2_pkt_send_noqueue(ssh
, pktout
);
7837 } else if (code
== TS_REKEY
) {
7838 if (!ssh
->kex_in_progress
&& ssh
->version
== 2) {
7839 do_ssh2_transport(ssh
, "at user request", -1, NULL
);
7841 } else if (code
== TS_BRK
) {
7842 if (ssh
->state
== SSH_STATE_CLOSED
7843 || ssh
->state
== SSH_STATE_PREPACKET
) return;
7844 if (ssh
->version
== 1) {
7845 logevent("Unable to send BREAK signal in SSH1");
7846 } else if (ssh
->mainchan
) {
7847 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7848 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
7849 ssh2_pkt_addstring(pktout
, "break");
7850 ssh2_pkt_addbool(pktout
, 0);
7851 ssh2_pkt_adduint32(pktout
, 0); /* default break length */
7852 ssh2_pkt_send(ssh
, pktout
);
7855 /* Is is a POSIX signal? */
7856 char *signame
= NULL
;
7857 if (code
== TS_SIGABRT
) signame
= "ABRT";
7858 if (code
== TS_SIGALRM
) signame
= "ALRM";
7859 if (code
== TS_SIGFPE
) signame
= "FPE";
7860 if (code
== TS_SIGHUP
) signame
= "HUP";
7861 if (code
== TS_SIGILL
) signame
= "ILL";
7862 if (code
== TS_SIGINT
) signame
= "INT";
7863 if (code
== TS_SIGKILL
) signame
= "KILL";
7864 if (code
== TS_SIGPIPE
) signame
= "PIPE";
7865 if (code
== TS_SIGQUIT
) signame
= "QUIT";
7866 if (code
== TS_SIGSEGV
) signame
= "SEGV";
7867 if (code
== TS_SIGTERM
) signame
= "TERM";
7868 if (code
== TS_SIGUSR1
) signame
= "USR1";
7869 if (code
== TS_SIGUSR2
) signame
= "USR2";
7870 /* The SSH-2 protocol does in principle support arbitrary named
7871 * signals, including signame@domain, but we don't support those. */
7873 /* It's a signal. */
7874 if (ssh
->version
== 2 && ssh
->mainchan
) {
7875 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7876 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
7877 ssh2_pkt_addstring(pktout
, "signal");
7878 ssh2_pkt_addbool(pktout
, 0);
7879 ssh2_pkt_addstring(pktout
, signame
);
7880 ssh2_pkt_send(ssh
, pktout
);
7881 logeventf(ssh
, "Sent signal SIG%s", signame
);
7884 /* Never heard of it. Do nothing */
7889 void *new_sock_channel(void *handle
, Socket s
)
7891 Ssh ssh
= (Ssh
) handle
;
7892 struct ssh_channel
*c
;
7893 c
= snew(struct ssh_channel
);
7898 c
->localid
= alloc_channel_id(ssh
);
7900 c
->type
= CHAN_SOCKDATA_DORMANT
;/* identify channel type */
7902 bufchain_init(&c
->v
.v2
.outbuffer
);
7903 add234(ssh
->channels
, c
);
7909 * This is called when stdout/stderr (the entity to which
7910 * from_backend sends data) manages to clear some backlog.
7912 static void ssh_unthrottle(void *handle
, int bufsize
)
7914 Ssh ssh
= (Ssh
) handle
;
7915 if (ssh
->version
== 1) {
7916 if (ssh
->v1_stdout_throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
7917 ssh
->v1_stdout_throttling
= 0;
7918 ssh1_throttle(ssh
, -1);
7921 if (ssh
->mainchan
&& ssh
->mainchan
->closes
== 0)
7922 ssh2_set_window(ssh
->mainchan
, OUR_V2_WINSIZE
- bufsize
);
7926 void ssh_send_port_open(void *channel
, char *hostname
, int port
, char *org
)
7928 struct ssh_channel
*c
= (struct ssh_channel
*)channel
;
7930 struct Packet
*pktout
;
7932 logeventf(ssh
, "Opening forwarded connection to %s:%d", hostname
, port
);
7934 if (ssh
->version
== 1) {
7935 send_packet(ssh
, SSH1_MSG_PORT_OPEN
,
7936 PKT_INT
, c
->localid
,
7939 /* PKT_STR, <org:orgport>, */
7942 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
7943 ssh2_pkt_addstring(pktout
, "direct-tcpip");
7944 ssh2_pkt_adduint32(pktout
, c
->localid
);
7945 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
7946 ssh2_pkt_adduint32(pktout
, c
->v
.v2
.locwindow
);/* our window size */
7947 ssh2_pkt_adduint32(pktout
, OUR_V2_MAXPKT
); /* our max pkt size */
7948 ssh2_pkt_addstring(pktout
, hostname
);
7949 ssh2_pkt_adduint32(pktout
, port
);
7951 * We make up values for the originator data; partly it's
7952 * too much hassle to keep track, and partly I'm not
7953 * convinced the server should be told details like that
7954 * about my local network configuration.
7956 ssh2_pkt_addstring(pktout
, "client-side-connection");
7957 ssh2_pkt_adduint32(pktout
, 0);
7958 ssh2_pkt_send(ssh
, pktout
);
7962 static Socket
ssh_socket(void *handle
)
7964 Ssh ssh
= (Ssh
) handle
;
7968 static int ssh_sendok(void *handle
)
7970 Ssh ssh
= (Ssh
) handle
;
7971 return ssh
->send_ok
;
7974 static int ssh_ldisc(void *handle
, int option
)
7976 Ssh ssh
= (Ssh
) handle
;
7977 if (option
== LD_ECHO
)
7978 return ssh
->echoing
;
7979 if (option
== LD_EDIT
)
7980 return ssh
->editing
;
7984 static void ssh_provide_ldisc(void *handle
, void *ldisc
)
7986 Ssh ssh
= (Ssh
) handle
;
7990 static void ssh_provide_logctx(void *handle
, void *logctx
)
7992 Ssh ssh
= (Ssh
) handle
;
7993 ssh
->logctx
= logctx
;
7996 static int ssh_return_exitcode(void *handle
)
7998 Ssh ssh
= (Ssh
) handle
;
8002 return (ssh
->exitcode
>= 0 ? ssh
->exitcode
: 0);
8006 * cfg_info for SSH is the currently running version of the
8007 * protocol. (1 for 1; 2 for 2; 0 for not-decided-yet.)
8009 static int ssh_cfg_info(void *handle
)
8011 Ssh ssh
= (Ssh
) handle
;
8012 return ssh
->version
;
8016 * Gross hack: pscp will try to start SFTP but fall back to scp1 if
8017 * that fails. This variable is the means by which scp.c can reach
8018 * into the SSH code and find out which one it got.
8020 extern int ssh_fallback_cmd(void *handle
)
8022 Ssh ssh
= (Ssh
) handle
;
8023 return ssh
->fallback_cmd
;
8026 Backend ssh_backend
= {
8036 ssh_return_exitcode
,