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_PUBLICKEY 0x0010
110 #define SSH2_PKTCTX_PASSWORD 0x0020
111 #define SSH2_PKTCTX_KBDINTER 0x0040
112 #define SSH2_PKTCTX_AUTH_MASK 0x00F0
114 #define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT 1 /* 0x1 */
115 #define SSH2_DISCONNECT_PROTOCOL_ERROR 2 /* 0x2 */
116 #define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED 3 /* 0x3 */
117 #define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED 4 /* 0x4 */
118 #define SSH2_DISCONNECT_MAC_ERROR 5 /* 0x5 */
119 #define SSH2_DISCONNECT_COMPRESSION_ERROR 6 /* 0x6 */
120 #define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE 7 /* 0x7 */
121 #define SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED 8 /* 0x8 */
122 #define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE 9 /* 0x9 */
123 #define SSH2_DISCONNECT_CONNECTION_LOST 10 /* 0xa */
124 #define SSH2_DISCONNECT_BY_APPLICATION 11 /* 0xb */
125 #define SSH2_DISCONNECT_TOO_MANY_CONNECTIONS 12 /* 0xc */
126 #define SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER 13 /* 0xd */
127 #define SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE 14 /* 0xe */
128 #define SSH2_DISCONNECT_ILLEGAL_USER_NAME 15 /* 0xf */
130 static const char *const ssh2_disconnect_reasons
[] = {
132 "SSH_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT",
133 "SSH_DISCONNECT_PROTOCOL_ERROR",
134 "SSH_DISCONNECT_KEY_EXCHANGE_FAILED",
135 "SSH_DISCONNECT_HOST_AUTHENTICATION_FAILED",
136 "SSH_DISCONNECT_MAC_ERROR",
137 "SSH_DISCONNECT_COMPRESSION_ERROR",
138 "SSH_DISCONNECT_SERVICE_NOT_AVAILABLE",
139 "SSH_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED",
140 "SSH_DISCONNECT_HOST_KEY_NOT_VERIFIABLE",
141 "SSH_DISCONNECT_CONNECTION_LOST",
142 "SSH_DISCONNECT_BY_APPLICATION",
143 "SSH_DISCONNECT_TOO_MANY_CONNECTIONS",
144 "SSH_DISCONNECT_AUTH_CANCELLED_BY_USER",
145 "SSH_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE",
146 "SSH_DISCONNECT_ILLEGAL_USER_NAME",
149 #define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1 /* 0x1 */
150 #define SSH2_OPEN_CONNECT_FAILED 2 /* 0x2 */
151 #define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3 /* 0x3 */
152 #define SSH2_OPEN_RESOURCE_SHORTAGE 4 /* 0x4 */
154 #define SSH2_EXTENDED_DATA_STDERR 1 /* 0x1 */
157 * Various remote-bug flags.
159 #define BUG_CHOKES_ON_SSH1_IGNORE 1
160 #define BUG_SSH2_HMAC 2
161 #define BUG_NEEDS_SSH1_PLAIN_PASSWORD 4
162 #define BUG_CHOKES_ON_RSA 8
163 #define BUG_SSH2_RSA_PADDING 16
164 #define BUG_SSH2_DERIVEKEY 32
165 #define BUG_SSH2_DH_GEX 64
166 #define BUG_SSH2_PK_SESSIONID 128
168 #define translate(x) if (type == x) return #x
169 #define translatec(x,ctx) if (type == x && (pkt_ctx & ctx)) return #x
170 static char *ssh1_pkt_type(int type
)
172 translate(SSH1_MSG_DISCONNECT
);
173 translate(SSH1_SMSG_PUBLIC_KEY
);
174 translate(SSH1_CMSG_SESSION_KEY
);
175 translate(SSH1_CMSG_USER
);
176 translate(SSH1_CMSG_AUTH_RSA
);
177 translate(SSH1_SMSG_AUTH_RSA_CHALLENGE
);
178 translate(SSH1_CMSG_AUTH_RSA_RESPONSE
);
179 translate(SSH1_CMSG_AUTH_PASSWORD
);
180 translate(SSH1_CMSG_REQUEST_PTY
);
181 translate(SSH1_CMSG_WINDOW_SIZE
);
182 translate(SSH1_CMSG_EXEC_SHELL
);
183 translate(SSH1_CMSG_EXEC_CMD
);
184 translate(SSH1_SMSG_SUCCESS
);
185 translate(SSH1_SMSG_FAILURE
);
186 translate(SSH1_CMSG_STDIN_DATA
);
187 translate(SSH1_SMSG_STDOUT_DATA
);
188 translate(SSH1_SMSG_STDERR_DATA
);
189 translate(SSH1_CMSG_EOF
);
190 translate(SSH1_SMSG_EXIT_STATUS
);
191 translate(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
);
192 translate(SSH1_MSG_CHANNEL_OPEN_FAILURE
);
193 translate(SSH1_MSG_CHANNEL_DATA
);
194 translate(SSH1_MSG_CHANNEL_CLOSE
);
195 translate(SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
);
196 translate(SSH1_SMSG_X11_OPEN
);
197 translate(SSH1_CMSG_PORT_FORWARD_REQUEST
);
198 translate(SSH1_MSG_PORT_OPEN
);
199 translate(SSH1_CMSG_AGENT_REQUEST_FORWARDING
);
200 translate(SSH1_SMSG_AGENT_OPEN
);
201 translate(SSH1_MSG_IGNORE
);
202 translate(SSH1_CMSG_EXIT_CONFIRMATION
);
203 translate(SSH1_CMSG_X11_REQUEST_FORWARDING
);
204 translate(SSH1_CMSG_AUTH_RHOSTS_RSA
);
205 translate(SSH1_MSG_DEBUG
);
206 translate(SSH1_CMSG_REQUEST_COMPRESSION
);
207 translate(SSH1_CMSG_AUTH_TIS
);
208 translate(SSH1_SMSG_AUTH_TIS_CHALLENGE
);
209 translate(SSH1_CMSG_AUTH_TIS_RESPONSE
);
210 translate(SSH1_CMSG_AUTH_CCARD
);
211 translate(SSH1_SMSG_AUTH_CCARD_CHALLENGE
);
212 translate(SSH1_CMSG_AUTH_CCARD_RESPONSE
);
215 static char *ssh2_pkt_type(int pkt_ctx
, int type
)
217 translate(SSH2_MSG_DISCONNECT
);
218 translate(SSH2_MSG_IGNORE
);
219 translate(SSH2_MSG_UNIMPLEMENTED
);
220 translate(SSH2_MSG_DEBUG
);
221 translate(SSH2_MSG_SERVICE_REQUEST
);
222 translate(SSH2_MSG_SERVICE_ACCEPT
);
223 translate(SSH2_MSG_KEXINIT
);
224 translate(SSH2_MSG_NEWKEYS
);
225 translatec(SSH2_MSG_KEXDH_INIT
, SSH2_PKTCTX_DHGROUP
);
226 translatec(SSH2_MSG_KEXDH_REPLY
, SSH2_PKTCTX_DHGROUP
);
227 translatec(SSH2_MSG_KEX_DH_GEX_REQUEST
, SSH2_PKTCTX_DHGEX
);
228 translatec(SSH2_MSG_KEX_DH_GEX_GROUP
, SSH2_PKTCTX_DHGEX
);
229 translatec(SSH2_MSG_KEX_DH_GEX_INIT
, SSH2_PKTCTX_DHGEX
);
230 translatec(SSH2_MSG_KEX_DH_GEX_REPLY
, SSH2_PKTCTX_DHGEX
);
231 translate(SSH2_MSG_USERAUTH_REQUEST
);
232 translate(SSH2_MSG_USERAUTH_FAILURE
);
233 translate(SSH2_MSG_USERAUTH_SUCCESS
);
234 translate(SSH2_MSG_USERAUTH_BANNER
);
235 translatec(SSH2_MSG_USERAUTH_PK_OK
, SSH2_PKTCTX_PUBLICKEY
);
236 translatec(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ
, SSH2_PKTCTX_PASSWORD
);
237 translatec(SSH2_MSG_USERAUTH_INFO_REQUEST
, SSH2_PKTCTX_KBDINTER
);
238 translatec(SSH2_MSG_USERAUTH_INFO_RESPONSE
, SSH2_PKTCTX_KBDINTER
);
239 translate(SSH2_MSG_GLOBAL_REQUEST
);
240 translate(SSH2_MSG_REQUEST_SUCCESS
);
241 translate(SSH2_MSG_REQUEST_FAILURE
);
242 translate(SSH2_MSG_CHANNEL_OPEN
);
243 translate(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
);
244 translate(SSH2_MSG_CHANNEL_OPEN_FAILURE
);
245 translate(SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
246 translate(SSH2_MSG_CHANNEL_DATA
);
247 translate(SSH2_MSG_CHANNEL_EXTENDED_DATA
);
248 translate(SSH2_MSG_CHANNEL_EOF
);
249 translate(SSH2_MSG_CHANNEL_CLOSE
);
250 translate(SSH2_MSG_CHANNEL_REQUEST
);
251 translate(SSH2_MSG_CHANNEL_SUCCESS
);
252 translate(SSH2_MSG_CHANNEL_FAILURE
);
258 #define GET_32BIT(cp) \
259 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
260 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
261 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
262 ((unsigned long)(unsigned char)(cp)[3]))
264 #define PUT_32BIT(cp, value) { \
265 (cp)[0] = (unsigned char)((value) >> 24); \
266 (cp)[1] = (unsigned char)((value) >> 16); \
267 (cp)[2] = (unsigned char)((value) >> 8); \
268 (cp)[3] = (unsigned char)(value); }
270 /* Enumeration values for fields in SSH-1 packets */
272 PKT_END
, PKT_INT
, PKT_CHAR
, PKT_DATA
, PKT_STR
, PKT_BIGNUM
,
273 /* These values are for communicating relevant semantics of
274 * fields to the packet logging code. */
275 PKTT_OTHER
, PKTT_PASSWORD
, PKTT_DATA
279 * Coroutine mechanics for the sillier bits of the code. If these
280 * macros look impenetrable to you, you might find it helpful to
283 * http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
285 * which explains the theory behind these macros.
287 * In particular, if you are getting `case expression not constant'
288 * errors when building with MS Visual Studio, this is because MS's
289 * Edit and Continue debugging feature causes their compiler to
290 * violate ANSI C. To disable Edit and Continue debugging:
292 * - right-click ssh.c in the FileView
294 * - select the C/C++ tab and the General category
295 * - under `Debug info:', select anything _other_ than `Program
296 * Database for Edit and Continue'.
298 #define crBegin(v) { int *crLine = &v; switch(v) { case 0:;
301 if (!ssh->t) ssh->t = snew(struct t); \
303 #define crFinish(z) } *crLine = 0; return (z); }
304 #define crFinishV } *crLine = 0; return; }
305 #define crReturn(z) \
307 *crLine =__LINE__; return (z); case __LINE__:;\
311 *crLine=__LINE__; return; case __LINE__:;\
313 #define crStop(z) do{ *crLine = 0; return (z); }while(0)
314 #define crStopV do{ *crLine = 0; return; }while(0)
315 #define crWaitUntil(c) do { crReturn(0); } while (!(c))
316 #define crWaitUntilV(c) do { crReturnV; } while (!(c))
318 typedef struct ssh_tag
*Ssh
;
321 static struct Packet
*ssh2_pkt_init(int pkt_type
);
322 static void ssh2_pkt_addbool(struct Packet
*, unsigned char value
);
323 static void ssh2_pkt_adduint32(struct Packet
*, unsigned long value
);
324 static void ssh2_pkt_addstring_start(struct Packet
*);
325 static void ssh2_pkt_addstring_str(struct Packet
*, char *data
);
326 static void ssh2_pkt_addstring_data(struct Packet
*, char *data
, int len
);
327 static void ssh2_pkt_addstring(struct Packet
*, char *data
);
328 static unsigned char *ssh2_mpint_fmt(Bignum b
, int *len
);
329 static void ssh2_pkt_addmp(struct Packet
*, Bignum b
);
330 static int ssh2_pkt_construct(Ssh
, struct Packet
*);
331 static void ssh2_pkt_send(Ssh
, struct Packet
*);
332 static void ssh2_pkt_send_noqueue(Ssh
, struct Packet
*);
333 static int do_ssh1_login(Ssh ssh
, unsigned char *in
, int inlen
,
334 struct Packet
*pktin
);
335 static void do_ssh2_authconn(Ssh ssh
, unsigned char *in
, int inlen
,
336 struct Packet
*pktin
);
339 * Buffer management constants. There are several of these for
340 * various different purposes:
342 * - SSH1_BUFFER_LIMIT is the amount of backlog that must build up
343 * on a local data stream before we throttle the whole SSH
344 * connection (in SSH1 only). Throttling the whole connection is
345 * pretty drastic so we set this high in the hope it won't
348 * - SSH_MAX_BACKLOG is the amount of backlog that must build up
349 * on the SSH connection itself before we defensively throttle
350 * _all_ local data streams. This is pretty drastic too (though
351 * thankfully unlikely in SSH2 since the window mechanism should
352 * ensure that the server never has any need to throttle its end
353 * of the connection), so we set this high as well.
355 * - OUR_V2_WINSIZE is the maximum window size we present on SSH2
359 #define SSH1_BUFFER_LIMIT 32768
360 #define SSH_MAX_BACKLOG 32768
361 #define OUR_V2_WINSIZE 16384
363 const static struct ssh_kex
*kex_algs
[] = {
364 &ssh_diffiehellman_gex
,
365 &ssh_diffiehellman_group14
,
366 &ssh_diffiehellman_group1
,
369 const static struct ssh_signkey
*hostkey_algs
[] = { &ssh_rsa
, &ssh_dss
};
371 static void *nullmac_make_context(void)
375 static void nullmac_free_context(void *handle
)
378 static void nullmac_key(void *handle
, unsigned char *key
)
381 static void nullmac_generate(void *handle
, unsigned char *blk
, int len
,
385 static int nullmac_verify(void *handle
, unsigned char *blk
, int len
,
390 const static struct ssh_mac ssh_mac_none
= {
391 nullmac_make_context
, nullmac_free_context
, nullmac_key
,
392 nullmac_generate
, nullmac_verify
, "none", 0
394 const static struct ssh_mac
*macs
[] = {
395 &ssh_sha1
, &ssh_md5
, &ssh_mac_none
397 const static struct ssh_mac
*buggymacs
[] = {
398 &ssh_sha1_buggy
, &ssh_md5
, &ssh_mac_none
401 static void *ssh_comp_none_init(void)
405 static void ssh_comp_none_cleanup(void *handle
)
408 static int ssh_comp_none_block(void *handle
, unsigned char *block
, int len
,
409 unsigned char **outblock
, int *outlen
)
413 static int ssh_comp_none_disable(void *handle
)
417 const static struct ssh_compress ssh_comp_none
= {
419 ssh_comp_none_init
, ssh_comp_none_cleanup
, ssh_comp_none_block
,
420 ssh_comp_none_init
, ssh_comp_none_cleanup
, ssh_comp_none_block
,
421 ssh_comp_none_disable
, NULL
423 extern const struct ssh_compress ssh_zlib
;
424 const static struct ssh_compress
*compressions
[] = {
425 &ssh_zlib
, &ssh_comp_none
428 enum { /* channel types */
433 CHAN_SOCKDATA_DORMANT
/* one the remote hasn't confirmed */
437 * 2-3-4 tree storing channels.
440 Ssh ssh
; /* pointer back to main context */
441 unsigned remoteid
, localid
;
444 * In SSH1, this value contains four bits:
446 * 1 We have sent SSH1_MSG_CHANNEL_CLOSE.
447 * 2 We have sent SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION.
448 * 4 We have received SSH1_MSG_CHANNEL_CLOSE.
449 * 8 We have received SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION.
451 * A channel is completely finished with when all four bits are set.
455 struct ssh1_data_channel
{
458 struct ssh2_data_channel
{
460 unsigned remwindow
, remmaxpkt
;
465 struct ssh_agent_channel
{
466 unsigned char *message
;
467 unsigned char msglen
[4];
468 unsigned lensofar
, totallen
;
470 struct ssh_x11_channel
{
473 struct ssh_pfd_channel
{
480 * 2-3-4 tree storing remote->local port forwardings. SSH 1 and SSH
481 * 2 use this structure in different ways, reflecting SSH 2's
482 * altogether saner approach to port forwarding.
484 * In SSH 1, you arrange a remote forwarding by sending the server
485 * the remote port number, and the local destination host:port.
486 * When a connection comes in, the server sends you back that
487 * host:port pair, and you connect to it. This is a ready-made
488 * security hole if you're not on the ball: a malicious server
489 * could send you back _any_ host:port pair, so if you trustingly
490 * connect to the address it gives you then you've just opened the
491 * entire inside of your corporate network just by connecting
492 * through it to a dodgy SSH server. Hence, we must store a list of
493 * host:port pairs we _are_ trying to forward to, and reject a
494 * connection request from the server if it's not in the list.
496 * In SSH 2, each side of the connection minds its own business and
497 * doesn't send unnecessary information to the other. You arrange a
498 * remote forwarding by sending the server just the remote port
499 * number. When a connection comes in, the server tells you which
500 * of its ports was connected to; and _you_ have to remember what
501 * local host:port pair went with that port number.
503 * Hence: in SSH 1 this structure stores host:port pairs we intend
504 * to allow connections to, and is indexed by those host:port
505 * pairs. In SSH 2 it stores a mapping from source port to
506 * destination host:port pair, and is indexed by source port.
508 struct ssh_rportfwd
{
509 unsigned sport
, dport
;
516 unsigned long sequence
;
521 long encrypted_len
; /* for SSH2 total-size counting */
524 * State associated with packet logging
528 struct logblank_t
*blanks
;
531 static void ssh1_protocol(Ssh ssh
, unsigned char *in
, int inlen
,
532 struct Packet
*pktin
);
533 static void ssh2_protocol(Ssh ssh
, unsigned char *in
, int inlen
,
534 struct Packet
*pktin
);
535 static void ssh1_protocol_setup(Ssh ssh
);
536 static void ssh2_protocol_setup(Ssh ssh
);
537 static void ssh_size(void *handle
, int width
, int height
);
538 static void ssh_special(void *handle
, Telnet_Special
);
539 static int ssh2_try_send(struct ssh_channel
*c
);
540 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
, int len
);
541 static void ssh_throttle_all(Ssh ssh
, int enable
, int bufsize
);
542 static void ssh2_set_window(struct ssh_channel
*c
, unsigned newwin
);
543 static int ssh_sendbuffer(void *handle
);
544 static void ssh_do_close(Ssh ssh
);
545 static unsigned long ssh_pkt_getuint32(struct Packet
*pkt
);
546 static int ssh2_pkt_getbool(struct Packet
*pkt
);
547 static void ssh_pkt_getstring(struct Packet
*pkt
, char **p
, int *length
);
548 static void ssh2_timer(void *ctx
, long now
);
549 static int do_ssh2_transport(Ssh ssh
, unsigned char *in
, int inlen
,
550 struct Packet
*pktin
);
552 struct rdpkt1_state_tag
{
553 long len
, pad
, biglen
, to_read
;
554 unsigned long realcrc
, gotcrc
;
558 struct Packet
*pktin
;
561 struct rdpkt2_state_tag
{
562 long len
, pad
, payload
, packetlen
, maclen
;
565 unsigned long incoming_sequence
;
566 struct Packet
*pktin
;
569 typedef void (*handler_fn_t
)(Ssh ssh
, struct Packet
*pktin
);
572 const struct plug_function_table
*fn
;
573 /* the above field _must_ be first in the structure */
575 SHA_State exhash
, exhashbase
;
582 unsigned char session_key
[32];
584 int v1_remote_protoflags
;
585 int v1_local_protoflags
;
586 int agentfwd_enabled
;
589 const struct ssh_cipher
*cipher
;
592 const struct ssh2_cipher
*cscipher
, *sccipher
;
593 void *cs_cipher_ctx
, *sc_cipher_ctx
;
594 const struct ssh_mac
*csmac
, *scmac
;
595 void *cs_mac_ctx
, *sc_mac_ctx
;
596 const struct ssh_compress
*cscomp
, *sccomp
;
597 void *cs_comp_ctx
, *sc_comp_ctx
;
598 const struct ssh_kex
*kex
;
599 const struct ssh_signkey
*hostkey
;
600 unsigned char v2_session_id
[20];
606 int echoing
, editing
;
610 int ospeed
, ispeed
; /* temporaries */
611 int term_width
, term_height
;
613 tree234
*channels
; /* indexed by local id */
614 struct ssh_channel
*mainchan
; /* primary session channel */
621 SSH_STATE_BEFORE_SIZE
,
627 int size_needed
, eof_needed
;
629 struct Packet
**queue
;
630 int queuelen
, queuesize
;
632 unsigned char *deferred_send_data
;
633 int deferred_len
, deferred_size
;
636 * Gross hack: pscp will try to start SFTP but fall back to
637 * scp1 if that fails. This variable is the means by which
638 * scp.c can reach into the SSH code and find out which one it
644 * Used for username and password input.
646 char *userpass_input_buffer
;
647 int userpass_input_buflen
;
648 int userpass_input_bufpos
;
649 int userpass_input_echo
;
651 char *portfwd_strptr
;
657 int v1_throttle_count
;
660 int v1_stdout_throttling
;
661 int v2_outgoing_sequence
;
663 int ssh1_rdpkt_crstate
;
664 int ssh2_rdpkt_crstate
;
665 int do_ssh_init_crstate
;
666 int ssh_gotdata_crstate
;
667 int do_ssh1_login_crstate
;
668 int do_ssh1_connection_crstate
;
669 int do_ssh2_transport_crstate
;
670 int do_ssh2_authconn_crstate
;
672 void *do_ssh_init_state
;
673 void *do_ssh1_login_state
;
674 void *do_ssh2_transport_state
;
675 void *do_ssh2_authconn_state
;
677 struct rdpkt1_state_tag rdpkt1_state
;
678 struct rdpkt2_state_tag rdpkt2_state
;
680 /* ssh1 and ssh2 use this for different things, but both use it */
681 int protocol_initial_phase_done
;
683 void (*protocol
) (Ssh ssh
, unsigned char *in
, int inlen
,
685 struct Packet
*(*s_rdpkt
) (Ssh ssh
, unsigned char **data
, int *datalen
);
688 * We maintain a full _copy_ of a Config structure here, not
689 * merely a pointer to it. That way, when we're passed a new
690 * one for reconfiguration, we can check the differences and
691 * potentially reconfigure port forwardings etc in mid-session.
696 * Used to transfer data back from async agent callbacks.
698 void *agent_response
;
699 int agent_response_len
;
702 * Dispatch table for packet types that we may have to deal
705 handler_fn_t packet_dispatch
[256];
708 * This module deals with sending keepalives.
713 * Track incoming and outgoing data sizes and time, for
716 unsigned long incoming_data_size
, outgoing_data_size
, deferred_data_size
;
721 #define MAX_DATA_BEFORE_REKEY (0x40000000UL)
722 #define REKEY_TIMEOUT (3600 * TICKSPERSEC)
724 #define logevent(s) logevent(ssh->frontend, s)
726 /* logevent, only printf-formatted. */
727 static void logeventf(Ssh ssh
, const char *fmt
, ...)
733 buf
= dupvprintf(fmt
, ap
);
739 #define bombout(msg) \
741 char *text = dupprintf msg; \
744 connection_fatal(ssh->frontend, "%s", text); \
748 /* Functions to leave bits out of the SSH packet log file. */
750 static void dont_log_password(Ssh ssh
, struct Packet
*pkt
, int blanktype
)
752 if (ssh
->cfg
.logomitpass
)
753 pkt
->logmode
= blanktype
;
756 static void dont_log_data(Ssh ssh
, struct Packet
*pkt
, int blanktype
)
758 if (ssh
->cfg
.logomitdata
)
759 pkt
->logmode
= blanktype
;
762 static void end_log_omission(Ssh ssh
, struct Packet
*pkt
)
764 pkt
->logmode
= PKTLOG_EMIT
;
767 static int ssh_channelcmp(void *av
, void *bv
)
769 struct ssh_channel
*a
= (struct ssh_channel
*) av
;
770 struct ssh_channel
*b
= (struct ssh_channel
*) bv
;
771 if (a
->localid
< b
->localid
)
773 if (a
->localid
> b
->localid
)
777 static int ssh_channelfind(void *av
, void *bv
)
779 unsigned *a
= (unsigned *) av
;
780 struct ssh_channel
*b
= (struct ssh_channel
*) bv
;
788 static int ssh_rportcmp_ssh1(void *av
, void *bv
)
790 struct ssh_rportfwd
*a
= (struct ssh_rportfwd
*) av
;
791 struct ssh_rportfwd
*b
= (struct ssh_rportfwd
*) bv
;
793 if ( (i
= strcmp(a
->dhost
, b
->dhost
)) != 0)
794 return i
< 0 ?
-1 : +1;
795 if (a
->dport
> b
->dport
)
797 if (a
->dport
< b
->dport
)
802 static int ssh_rportcmp_ssh2(void *av
, void *bv
)
804 struct ssh_rportfwd
*a
= (struct ssh_rportfwd
*) av
;
805 struct ssh_rportfwd
*b
= (struct ssh_rportfwd
*) bv
;
807 if (a
->sport
> b
->sport
)
809 if (a
->sport
< b
->sport
)
814 static int alloc_channel_id(Ssh ssh
)
816 const unsigned CHANNEL_NUMBER_OFFSET
= 256;
817 unsigned low
, high
, mid
;
819 struct ssh_channel
*c
;
822 * First-fit allocation of channel numbers: always pick the
823 * lowest unused one. To do this, binary-search using the
824 * counted B-tree to find the largest channel ID which is in a
825 * contiguous sequence from the beginning. (Precisely
826 * everything in that sequence must have ID equal to its tree
827 * index plus CHANNEL_NUMBER_OFFSET.)
829 tsize
= count234(ssh
->channels
);
833 while (high
- low
> 1) {
834 mid
= (high
+ low
) / 2;
835 c
= index234(ssh
->channels
, mid
);
836 if (c
->localid
== mid
+ CHANNEL_NUMBER_OFFSET
)
837 low
= mid
; /* this one is fine */
839 high
= mid
; /* this one is past it */
842 * Now low points to either -1, or the tree index of the
843 * largest ID in the initial sequence.
846 unsigned i
= low
+ 1 + CHANNEL_NUMBER_OFFSET
;
847 assert(NULL
== find234(ssh
->channels
, &i
, ssh_channelfind
));
849 return low
+ 1 + CHANNEL_NUMBER_OFFSET
;
852 static void c_write(Ssh ssh
, const char *buf
, int len
)
854 if ((flags
& FLAG_STDERR
)) {
856 for (i
= 0; i
< len
; i
++)
858 fputc(buf
[i
], stderr
);
861 from_backend(ssh
->frontend
, 1, buf
, len
);
864 static void c_write_untrusted(Ssh ssh
, const char *buf
, int len
)
867 for (i
= 0; i
< len
; i
++) {
869 c_write(ssh
, "\r\n", 2);
870 else if ((buf
[i
] & 0x60) || (buf
[i
] == '\r'))
871 c_write(ssh
, buf
+ i
, 1);
875 static void c_write_str(Ssh ssh
, const char *buf
)
877 c_write(ssh
, buf
, strlen(buf
));
880 static void ssh_free_packet(struct Packet
*pkt
)
885 static struct Packet
*ssh_new_packet(void)
887 struct Packet
*pkt
= snew(struct Packet
);
891 pkt
->logmode
= PKTLOG_EMIT
;
899 * Collect incoming data in the incoming packet buffer.
900 * Decipher and verify the packet when it is completely read.
901 * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets.
902 * Update the *data and *datalen variables.
903 * Return a Packet structure when a packet is completed.
905 static struct Packet
*ssh1_rdpkt(Ssh ssh
, unsigned char **data
, int *datalen
)
907 struct rdpkt1_state_tag
*st
= &ssh
->rdpkt1_state
;
909 crBegin(ssh
->ssh1_rdpkt_crstate
);
911 st
->pktin
= ssh_new_packet();
914 st
->pktin
->length
= 0;
916 for (st
->i
= st
->len
= 0; st
->i
< 4; st
->i
++) {
917 while ((*datalen
) == 0)
919 st
->len
= (st
->len
<< 8) + **data
;
920 (*data
)++, (*datalen
)--;
923 st
->pad
= 8 - (st
->len
% 8);
924 st
->biglen
= st
->len
+ st
->pad
;
925 st
->pktin
->length
= st
->len
- 5;
927 if (st
->biglen
< 0) {
928 bombout(("Extremely large packet length from server suggests"
929 " data stream corruption"));
930 ssh_free_packet(st
->pktin
);
934 st
->pktin
->maxlen
= st
->biglen
;
935 st
->pktin
->data
= snewn(st
->biglen
+ APIEXTRA
, unsigned char);
937 st
->to_read
= st
->biglen
;
938 st
->p
= st
->pktin
->data
;
939 while (st
->to_read
> 0) {
940 st
->chunk
= st
->to_read
;
941 while ((*datalen
) == 0)
943 if (st
->chunk
> (*datalen
))
944 st
->chunk
= (*datalen
);
945 memcpy(st
->p
, *data
, st
->chunk
);
947 *datalen
-= st
->chunk
;
949 st
->to_read
-= st
->chunk
;
952 if (ssh
->cipher
&& detect_attack(ssh
->crcda_ctx
, st
->pktin
->data
,
954 bombout(("Network attack (CRC compensation) detected!"));
955 ssh_free_packet(st
->pktin
);
960 ssh
->cipher
->decrypt(ssh
->v1_cipher_ctx
, st
->pktin
->data
, st
->biglen
);
962 st
->realcrc
= crc32_compute(st
->pktin
->data
, st
->biglen
- 4);
963 st
->gotcrc
= GET_32BIT(st
->pktin
->data
+ st
->biglen
- 4);
964 if (st
->gotcrc
!= st
->realcrc
) {
965 bombout(("Incorrect CRC received on packet"));
966 ssh_free_packet(st
->pktin
);
970 st
->pktin
->body
= st
->pktin
->data
+ st
->pad
+ 1;
971 st
->pktin
->savedpos
= 0;
973 if (ssh
->v1_compressing
) {
974 unsigned char *decompblk
;
976 if (!zlib_decompress_block(ssh
->sc_comp_ctx
,
977 st
->pktin
->body
- 1, st
->pktin
->length
+ 1,
978 &decompblk
, &decomplen
)) {
979 bombout(("Zlib decompression encountered invalid data"));
980 ssh_free_packet(st
->pktin
);
984 if (st
->pktin
->maxlen
< st
->pad
+ decomplen
) {
985 st
->pktin
->maxlen
= st
->pad
+ decomplen
;
986 st
->pktin
->data
= sresize(st
->pktin
->data
,
987 st
->pktin
->maxlen
+ APIEXTRA
,
989 st
->pktin
->body
= st
->pktin
->data
+ st
->pad
+ 1;
992 memcpy(st
->pktin
->body
- 1, decompblk
, decomplen
);
994 st
->pktin
->length
= decomplen
- 1;
997 st
->pktin
->type
= st
->pktin
->body
[-1];
1000 * Log incoming packet, possibly omitting sensitive fields.
1004 struct logblank_t blank
;
1005 if (ssh
->cfg
.logomitdata
) {
1006 int do_blank
= FALSE
, blank_prefix
= 0;
1007 /* "Session data" packets - omit the data field */
1008 if ((st
->pktin
->type
== SSH1_SMSG_STDOUT_DATA
) ||
1009 (st
->pktin
->type
== SSH1_SMSG_STDERR_DATA
)) {
1010 do_blank
= TRUE
; blank_prefix
= 0;
1011 } else if (st
->pktin
->type
== SSH1_MSG_CHANNEL_DATA
) {
1012 do_blank
= TRUE
; blank_prefix
= 4;
1015 blank
.offset
= blank_prefix
;
1016 blank
.len
= st
->pktin
->length
;
1017 blank
.type
= PKTLOG_OMIT
;
1021 log_packet(ssh
->logctx
,
1022 PKT_INCOMING
, st
->pktin
->type
,
1023 ssh1_pkt_type(st
->pktin
->type
),
1024 st
->pktin
->body
, st
->pktin
->length
,
1028 crFinish(st
->pktin
);
1031 static struct Packet
*ssh2_rdpkt(Ssh ssh
, unsigned char **data
, int *datalen
)
1033 struct rdpkt2_state_tag
*st
= &ssh
->rdpkt2_state
;
1035 crBegin(ssh
->ssh2_rdpkt_crstate
);
1037 st
->pktin
= ssh_new_packet();
1039 st
->pktin
->type
= 0;
1040 st
->pktin
->length
= 0;
1042 st
->cipherblk
= ssh
->sccipher
->blksize
;
1045 if (st
->cipherblk
< 8)
1048 st
->pktin
->data
= snewn(st
->cipherblk
+ APIEXTRA
, unsigned char);
1051 * Acquire and decrypt the first block of the packet. This will
1052 * contain the length and padding details.
1054 for (st
->i
= st
->len
= 0; st
->i
< st
->cipherblk
; st
->i
++) {
1055 while ((*datalen
) == 0)
1057 st
->pktin
->data
[st
->i
] = *(*data
)++;
1062 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
1063 st
->pktin
->data
, st
->cipherblk
);
1066 * Now get the length and padding figures.
1068 st
->len
= GET_32BIT(st
->pktin
->data
);
1069 st
->pad
= st
->pktin
->data
[4];
1072 * _Completely_ silly lengths should be stomped on before they
1073 * do us any more damage.
1075 if (st
->len
< 0 || st
->pad
< 0 || st
->len
+ st
->pad
< 0) {
1076 bombout(("Incoming packet was garbled on decryption"));
1077 ssh_free_packet(st
->pktin
);
1082 * This enables us to deduce the payload length.
1084 st
->payload
= st
->len
- st
->pad
- 1;
1086 st
->pktin
->length
= st
->payload
+ 5;
1089 * So now we can work out the total packet length.
1091 st
->packetlen
= st
->len
+ 4;
1092 st
->maclen
= ssh
->scmac ? ssh
->scmac
->len
: 0;
1095 * Allocate memory for the rest of the packet.
1097 st
->pktin
->maxlen
= st
->packetlen
+ st
->maclen
;
1098 st
->pktin
->data
= sresize(st
->pktin
->data
,
1099 st
->pktin
->maxlen
+ APIEXTRA
,
1103 * Read and decrypt the remainder of the packet.
1105 for (st
->i
= st
->cipherblk
; st
->i
< st
->packetlen
+ st
->maclen
;
1107 while ((*datalen
) == 0)
1109 st
->pktin
->data
[st
->i
] = *(*data
)++;
1112 /* Decrypt everything _except_ the MAC. */
1114 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
1115 st
->pktin
->data
+ st
->cipherblk
,
1116 st
->packetlen
- st
->cipherblk
);
1118 st
->pktin
->encrypted_len
= st
->packetlen
;
1124 && !ssh
->scmac
->verify(ssh
->sc_mac_ctx
, st
->pktin
->data
, st
->len
+ 4,
1125 st
->incoming_sequence
)) {
1126 bombout(("Incorrect MAC received on packet"));
1127 ssh_free_packet(st
->pktin
);
1131 st
->pktin
->sequence
= st
->incoming_sequence
++;
1134 * Decompress packet payload.
1137 unsigned char *newpayload
;
1140 ssh
->sccomp
->decompress(ssh
->sc_comp_ctx
,
1141 st
->pktin
->data
+ 5, st
->pktin
->length
- 5,
1142 &newpayload
, &newlen
)) {
1143 if (st
->pktin
->maxlen
< newlen
+ 5) {
1144 st
->pktin
->maxlen
= newlen
+ 5;
1145 st
->pktin
->data
= sresize(st
->pktin
->data
,
1146 st
->pktin
->maxlen
+ APIEXTRA
,
1149 st
->pktin
->length
= 5 + newlen
;
1150 memcpy(st
->pktin
->data
+ 5, newpayload
, newlen
);
1155 st
->pktin
->savedpos
= 6;
1156 st
->pktin
->body
= st
->pktin
->data
;
1157 st
->pktin
->type
= st
->pktin
->data
[5];
1160 * Log incoming packet, possibly omitting sensitive fields.
1164 struct logblank_t blank
;
1165 if (ssh
->cfg
.logomitdata
) {
1166 int do_blank
= FALSE
, blank_prefix
= 0;
1167 /* "Session data" packets - omit the data field */
1168 if (st
->pktin
->type
== SSH2_MSG_CHANNEL_DATA
) {
1169 do_blank
= TRUE
; blank_prefix
= 4;
1170 } else if (st
->pktin
->type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
) {
1171 do_blank
= TRUE
; blank_prefix
= 8;
1174 blank
.offset
= blank_prefix
;
1175 blank
.len
= (st
->pktin
->length
-6) - blank_prefix
;
1176 blank
.type
= PKTLOG_OMIT
;
1180 log_packet(ssh
->logctx
, PKT_INCOMING
, st
->pktin
->type
,
1181 ssh2_pkt_type(ssh
->pkt_ctx
, st
->pktin
->type
),
1182 st
->pktin
->data
+6, st
->pktin
->length
-6,
1186 crFinish(st
->pktin
);
1189 static void ssh1_pktout_size(struct Packet
*pkt
, int len
)
1193 len
+= 5; /* type and CRC */
1194 pad
= 8 - (len
% 8);
1197 pkt
->length
= len
- 5;
1198 if (pkt
->maxlen
< biglen
) {
1199 pkt
->maxlen
= biglen
;
1200 pkt
->data
= sresize(pkt
->data
, biglen
+ 4 + APIEXTRA
, unsigned char);
1202 pkt
->body
= pkt
->data
+ 4 + pad
+ 1;
1205 static struct Packet
*s_wrpkt_start(int type
, int len
)
1207 struct Packet
*pkt
= ssh_new_packet();
1208 ssh1_pktout_size(pkt
, len
);
1210 /* Initialise log omission state */
1216 static int s_wrpkt_prepare(Ssh ssh
, struct Packet
*pkt
)
1222 * XXX various versions of SC (including 8.8.4) screw up the
1223 * register allocation in this function and use the same register
1224 * (D6) for len and as a temporary, with predictable results. The
1225 * following sledgehammer prevents this.
1231 pkt
->body
[-1] = pkt
->type
;
1234 log_packet(ssh
->logctx
, PKT_OUTGOING
, pkt
->type
,
1235 ssh1_pkt_type(pkt
->type
),
1236 pkt
->body
, pkt
->length
,
1237 pkt
->nblanks
, pkt
->blanks
);
1238 sfree(pkt
->blanks
); pkt
->blanks
= NULL
;
1241 if (ssh
->v1_compressing
) {
1242 unsigned char *compblk
;
1244 zlib_compress_block(ssh
->cs_comp_ctx
,
1245 pkt
->body
- 1, pkt
->length
+ 1,
1246 &compblk
, &complen
);
1247 ssh1_pktout_size(pkt
, complen
- 1);
1248 memcpy(pkt
->body
- 1, compblk
, complen
);
1252 len
= pkt
->length
+ 5; /* type and CRC */
1253 pad
= 8 - (len
% 8);
1256 for (i
= 0; i
< pad
; i
++)
1257 pkt
->data
[i
+ 4] = random_byte();
1258 crc
= crc32_compute(pkt
->data
+ 4, biglen
- 4);
1259 PUT_32BIT(pkt
->data
+ biglen
, crc
);
1260 PUT_32BIT(pkt
->data
, len
);
1263 ssh
->cipher
->encrypt(ssh
->v1_cipher_ctx
, pkt
->data
+ 4, biglen
);
1268 static void s_wrpkt(Ssh ssh
, struct Packet
*pkt
)
1271 len
= s_wrpkt_prepare(ssh
, pkt
);
1272 backlog
= sk_write(ssh
->s
, (char *)pkt
->data
, len
);
1273 if (backlog
> SSH_MAX_BACKLOG
)
1274 ssh_throttle_all(ssh
, 1, backlog
);
1277 static void s_wrpkt_defer(Ssh ssh
, struct Packet
*pkt
)
1280 len
= s_wrpkt_prepare(ssh
, pkt
);
1281 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1282 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1283 ssh
->deferred_send_data
= sresize(ssh
->deferred_send_data
,
1287 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, pkt
->data
, len
);
1288 ssh
->deferred_len
+= len
;
1292 * Construct a packet with the specified contents.
1294 static struct Packet
*construct_packet(Ssh ssh
, int pkttype
,
1295 va_list ap1
, va_list ap2
)
1297 unsigned char *p
, *argp
, argchar
;
1298 unsigned long argint
;
1299 int pktlen
, argtype
, arglen
;
1304 while ((argtype
= va_arg(ap1
, int)) != PKT_END
) {
1307 (void) va_arg(ap1
, int);
1311 (void) va_arg(ap1
, int);
1315 (void) va_arg(ap1
, unsigned char *);
1316 arglen
= va_arg(ap1
, int);
1320 argp
= va_arg(ap1
, unsigned char *);
1321 arglen
= strlen((char *)argp
);
1322 pktlen
+= 4 + arglen
;
1325 bn
= va_arg(ap1
, Bignum
);
1326 pktlen
+= ssh1_bignum_length(bn
);
1331 /* ignore this pass */
1338 pkt
= s_wrpkt_start(pkttype
, pktlen
);
1341 while ((argtype
= va_arg(ap2
, int)) != PKT_END
) {
1342 int offset
= p
- pkt
->body
, len
= 0;
1344 /* Actual fields in the packet */
1346 argint
= va_arg(ap2
, int);
1347 PUT_32BIT(p
, argint
);
1351 argchar
= (unsigned char) va_arg(ap2
, int);
1356 argp
= va_arg(ap2
, unsigned char *);
1357 arglen
= va_arg(ap2
, int);
1358 memcpy(p
, argp
, arglen
);
1362 argp
= va_arg(ap2
, unsigned char *);
1363 arglen
= strlen((char *)argp
);
1364 PUT_32BIT(p
, arglen
);
1365 memcpy(p
+ 4, argp
, arglen
);
1369 bn
= va_arg(ap2
, Bignum
);
1370 len
= ssh1_write_bignum(p
, bn
);
1372 /* Tokens for modifications to packet logging */
1374 dont_log_password(ssh
, pkt
, PKTLOG_BLANK
);
1377 dont_log_data(ssh
, pkt
, PKTLOG_OMIT
);
1380 end_log_omission(ssh
, pkt
);
1384 /* Deal with logfile omission, if required. */
1385 if (len
&& (pkt
->logmode
!= PKTLOG_EMIT
)) {
1387 pkt
->blanks
= sresize(pkt
->blanks
, pkt
->nblanks
,
1389 pkt
->blanks
[pkt
->nblanks
-1].offset
= offset
;
1390 pkt
->blanks
[pkt
->nblanks
-1].len
= len
;
1391 pkt
->blanks
[pkt
->nblanks
-1].type
= pkt
->logmode
;
1398 static void send_packet(Ssh ssh
, int pkttype
, ...)
1402 va_start(ap1
, pkttype
);
1403 va_start(ap2
, pkttype
);
1404 pkt
= construct_packet(ssh
, pkttype
, ap1
, ap2
);
1408 ssh_free_packet(pkt
);
1411 static void defer_packet(Ssh ssh
, int pkttype
, ...)
1415 va_start(ap1
, pkttype
);
1416 va_start(ap2
, pkttype
);
1417 pkt
= construct_packet(ssh
, pkttype
, ap1
, ap2
);
1420 s_wrpkt_defer(ssh
, pkt
);
1421 ssh_free_packet(pkt
);
1424 static int ssh_versioncmp(char *a
, char *b
)
1427 unsigned long av
, bv
;
1429 av
= strtoul(a
, &ae
, 10);
1430 bv
= strtoul(b
, &be
, 10);
1432 return (av
< bv ?
-1 : +1);
1437 av
= strtoul(ae
, &ae
, 10);
1438 bv
= strtoul(be
, &be
, 10);
1440 return (av
< bv ?
-1 : +1);
1445 * Utility routines for putting an SSH-protocol `string' and
1446 * `uint32' into a SHA state.
1449 static void sha_string(SHA_State
* s
, void *str
, int len
)
1451 unsigned char lenblk
[4];
1452 PUT_32BIT(lenblk
, len
);
1453 SHA_Bytes(s
, lenblk
, 4);
1454 SHA_Bytes(s
, str
, len
);
1457 static void sha_uint32(SHA_State
* s
, unsigned i
)
1459 unsigned char intblk
[4];
1460 PUT_32BIT(intblk
, i
);
1461 SHA_Bytes(s
, intblk
, 4);
1465 * SSH2 packet construction functions.
1467 static void ssh2_pkt_ensure(struct Packet
*pkt
, int length
)
1469 if (pkt
->maxlen
< length
) {
1470 pkt
->maxlen
= length
+ 256;
1471 pkt
->data
= sresize(pkt
->data
, pkt
->maxlen
+ APIEXTRA
, unsigned char);
1474 static void ssh2_pkt_adddata(struct Packet
*pkt
, void *data
, int len
)
1476 if (pkt
->logmode
!= PKTLOG_EMIT
) {
1478 pkt
->blanks
= sresize(pkt
->blanks
, pkt
->nblanks
, struct logblank_t
);
1479 pkt
->blanks
[pkt
->nblanks
-1].offset
= pkt
->length
- 6;
1480 pkt
->blanks
[pkt
->nblanks
-1].len
= len
;
1481 pkt
->blanks
[pkt
->nblanks
-1].type
= pkt
->logmode
;
1484 ssh2_pkt_ensure(pkt
, pkt
->length
);
1485 memcpy(pkt
->data
+ pkt
->length
- len
, data
, len
);
1487 static void ssh2_pkt_addbyte(struct Packet
*pkt
, unsigned char byte
)
1489 ssh2_pkt_adddata(pkt
, &byte
, 1);
1491 static struct Packet
*ssh2_pkt_init(int pkt_type
)
1493 struct Packet
*pkt
= ssh_new_packet();
1495 ssh2_pkt_addbyte(pkt
, (unsigned char) pkt_type
);
1498 static void ssh2_pkt_addbool(struct Packet
*pkt
, unsigned char value
)
1500 ssh2_pkt_adddata(pkt
, &value
, 1);
1502 static void ssh2_pkt_adduint32(struct Packet
*pkt
, unsigned long value
)
1505 PUT_32BIT(x
, value
);
1506 ssh2_pkt_adddata(pkt
, x
, 4);
1508 static void ssh2_pkt_addstring_start(struct Packet
*pkt
)
1510 ssh2_pkt_adduint32(pkt
, 0);
1511 pkt
->savedpos
= pkt
->length
;
1513 static void ssh2_pkt_addstring_str(struct Packet
*pkt
, char *data
)
1515 ssh2_pkt_adddata(pkt
, data
, strlen(data
));
1516 PUT_32BIT(pkt
->data
+ pkt
->savedpos
- 4, pkt
->length
- pkt
->savedpos
);
1518 static void ssh2_pkt_addstring_data(struct Packet
*pkt
, char *data
, int len
)
1520 ssh2_pkt_adddata(pkt
, data
, len
);
1521 PUT_32BIT(pkt
->data
+ pkt
->savedpos
- 4, pkt
->length
- pkt
->savedpos
);
1523 static void ssh2_pkt_addstring(struct Packet
*pkt
, char *data
)
1525 ssh2_pkt_addstring_start(pkt
);
1526 ssh2_pkt_addstring_str(pkt
, data
);
1528 static unsigned char *ssh2_mpint_fmt(Bignum b
, int *len
)
1531 int i
, n
= (bignum_bitcount(b
) + 7) / 8;
1532 p
= snewn(n
+ 1, unsigned char);
1534 fatalbox("out of memory");
1536 for (i
= 1; i
<= n
; i
++)
1537 p
[i
] = bignum_byte(b
, n
- i
);
1539 while (i
<= n
&& p
[i
] == 0 && (p
[i
+ 1] & 0x80) == 0)
1541 memmove(p
, p
+ i
, n
+ 1 - i
);
1545 static void ssh2_pkt_addmp(struct Packet
*pkt
, Bignum b
)
1549 p
= ssh2_mpint_fmt(b
, &len
);
1550 ssh2_pkt_addstring_start(pkt
);
1551 ssh2_pkt_addstring_data(pkt
, (char *)p
, len
);
1556 * Construct an SSH2 final-form packet: compress it, encrypt it,
1557 * put the MAC on it. Final packet, ready to be sent, is stored in
1558 * pkt->data. Total length is returned.
1560 static int ssh2_pkt_construct(Ssh ssh
, struct Packet
*pkt
)
1562 int cipherblk
, maclen
, padding
, i
;
1565 log_packet(ssh
->logctx
, PKT_OUTGOING
, pkt
->data
[5],
1566 ssh2_pkt_type(ssh
->pkt_ctx
, pkt
->data
[5]),
1567 pkt
->data
+ 6, pkt
->length
- 6,
1568 pkt
->nblanks
, pkt
->blanks
);
1569 sfree(pkt
->blanks
); pkt
->blanks
= NULL
;
1573 * Compress packet payload.
1576 unsigned char *newpayload
;
1579 ssh
->cscomp
->compress(ssh
->cs_comp_ctx
, pkt
->data
+ 5,
1581 &newpayload
, &newlen
)) {
1583 ssh2_pkt_adddata(pkt
, newpayload
, newlen
);
1589 * Add padding. At least four bytes, and must also bring total
1590 * length (minus MAC) up to a multiple of the block size.
1592 cipherblk
= ssh
->cscipher ? ssh
->cscipher
->blksize
: 8; /* block size */
1593 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
1596 (cipherblk
- (pkt
->length
+ padding
) % cipherblk
) % cipherblk
;
1597 maclen
= ssh
->csmac ? ssh
->csmac
->len
: 0;
1598 ssh2_pkt_ensure(pkt
, pkt
->length
+ padding
+ maclen
);
1599 pkt
->data
[4] = padding
;
1600 for (i
= 0; i
< padding
; i
++)
1601 pkt
->data
[pkt
->length
+ i
] = random_byte();
1602 PUT_32BIT(pkt
->data
, pkt
->length
+ padding
- 4);
1604 ssh
->csmac
->generate(ssh
->cs_mac_ctx
, pkt
->data
,
1605 pkt
->length
+ padding
,
1606 ssh
->v2_outgoing_sequence
);
1607 ssh
->v2_outgoing_sequence
++; /* whether or not we MACed */
1610 ssh
->cscipher
->encrypt(ssh
->cs_cipher_ctx
,
1611 pkt
->data
, pkt
->length
+ padding
);
1613 pkt
->encrypted_len
= pkt
->length
+ padding
;
1615 /* Ready-to-send packet starts at pkt->data. We return length. */
1616 return pkt
->length
+ padding
+ maclen
;
1620 * Routines called from the main SSH code to send packets. There
1621 * are quite a few of these, because we have two separate
1622 * mechanisms for delaying the sending of packets:
1624 * - In order to send an IGNORE message and a password message in
1625 * a single fixed-length blob, we require the ability to
1626 * concatenate the encrypted forms of those two packets _into_ a
1627 * single blob and then pass it to our <network.h> transport
1628 * layer in one go. Hence, there's a deferment mechanism which
1629 * works after packet encryption.
1631 * - In order to avoid sending any connection-layer messages
1632 * during repeat key exchange, we have to queue up any such
1633 * outgoing messages _before_ they are encrypted (and in
1634 * particular before they're allocated sequence numbers), and
1635 * then send them once we've finished.
1637 * I call these mechanisms `defer' and `queue' respectively, so as
1638 * to distinguish them reasonably easily.
1640 * The functions send_noqueue() and defer_noqueue() free the packet
1641 * structure they are passed. Every outgoing packet goes through
1642 * precisely one of these functions in its life; packets passed to
1643 * ssh2_pkt_send() or ssh2_pkt_defer() either go straight to one of
1644 * these or get queued, and then when the queue is later emptied
1645 * the packets are all passed to defer_noqueue().
1649 * Send an SSH2 packet immediately, without queuing or deferring.
1651 static void ssh2_pkt_send_noqueue(Ssh ssh
, struct Packet
*pkt
)
1655 len
= ssh2_pkt_construct(ssh
, pkt
);
1656 backlog
= sk_write(ssh
->s
, (char *)pkt
->data
, len
);
1657 if (backlog
> SSH_MAX_BACKLOG
)
1658 ssh_throttle_all(ssh
, 1, backlog
);
1660 ssh
->outgoing_data_size
+= pkt
->encrypted_len
;
1661 if (!ssh
->kex_in_progress
&&
1662 ssh
->outgoing_data_size
> MAX_DATA_BEFORE_REKEY
)
1663 do_ssh2_transport(ssh
, "Initiating key re-exchange "
1664 "(too much data sent)", -1, NULL
);
1666 ssh_free_packet(pkt
);
1670 * Defer an SSH2 packet.
1672 static void ssh2_pkt_defer_noqueue(Ssh ssh
, struct Packet
*pkt
)
1674 int len
= ssh2_pkt_construct(ssh
, pkt
);
1675 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1676 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1677 ssh
->deferred_send_data
= sresize(ssh
->deferred_send_data
,
1681 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, pkt
->data
, len
);
1682 ssh
->deferred_len
+= len
;
1683 ssh
->deferred_data_size
+= pkt
->encrypted_len
;
1684 ssh_free_packet(pkt
);
1688 * Queue an SSH2 packet.
1690 static void ssh2_pkt_queue(Ssh ssh
, struct Packet
*pkt
)
1692 assert(ssh
->queueing
);
1694 if (ssh
->queuelen
>= ssh
->queuesize
) {
1695 ssh
->queuesize
= ssh
->queuelen
+ 32;
1696 ssh
->queue
= sresize(ssh
->queue
, ssh
->queuesize
, struct Packet
*);
1699 ssh
->queue
[ssh
->queuelen
++] = pkt
;
1703 * Either queue or send a packet, depending on whether queueing is
1706 static void ssh2_pkt_send(Ssh ssh
, struct Packet
*pkt
)
1709 ssh2_pkt_queue(ssh
, pkt
);
1711 ssh2_pkt_send_noqueue(ssh
, pkt
);
1715 * Either queue or defer a packet, depending on whether queueing is
1718 static void ssh2_pkt_defer(Ssh ssh
, struct Packet
*pkt
)
1721 ssh2_pkt_queue(ssh
, pkt
);
1723 ssh2_pkt_defer_noqueue(ssh
, pkt
);
1727 * Send the whole deferred data block constructed by
1728 * ssh2_pkt_defer() or SSH1's defer_packet().
1730 * The expected use of the defer mechanism is that you call
1731 * ssh2_pkt_defer() a few times, then call ssh_pkt_defersend(). If
1732 * not currently queueing, this simply sets up deferred_send_data
1733 * and then sends it. If we _are_ currently queueing, the calls to
1734 * ssh2_pkt_defer() put the deferred packets on to the queue
1735 * instead, and therefore ssh_pkt_defersend() has no deferred data
1736 * to send. Hence, there's no need to make it conditional on
1739 static void ssh_pkt_defersend(Ssh ssh
)
1742 backlog
= sk_write(ssh
->s
, (char *)ssh
->deferred_send_data
,
1744 ssh
->deferred_len
= ssh
->deferred_size
= 0;
1745 sfree(ssh
->deferred_send_data
);
1746 ssh
->deferred_send_data
= NULL
;
1747 if (backlog
> SSH_MAX_BACKLOG
)
1748 ssh_throttle_all(ssh
, 1, backlog
);
1750 ssh
->outgoing_data_size
+= ssh
->deferred_data_size
;
1751 if (!ssh
->kex_in_progress
&&
1752 ssh
->outgoing_data_size
> MAX_DATA_BEFORE_REKEY
)
1753 do_ssh2_transport(ssh
, "Initiating key re-exchange "
1754 "(too much data sent)", -1, NULL
);
1755 ssh
->deferred_data_size
= 0;
1759 * Send all queued SSH2 packets. We send them by means of
1760 * ssh2_pkt_defer_noqueue(), in case they included a pair of
1761 * packets that needed to be lumped together.
1763 static void ssh2_pkt_queuesend(Ssh ssh
)
1767 assert(!ssh
->queueing
);
1769 for (i
= 0; i
< ssh
->queuelen
; i
++)
1770 ssh2_pkt_defer_noqueue(ssh
, ssh
->queue
[i
]);
1773 ssh_pkt_defersend(ssh
);
1777 void bndebug(char *string
, Bignum b
)
1781 p
= ssh2_mpint_fmt(b
, &len
);
1782 debug(("%s", string
));
1783 for (i
= 0; i
< len
; i
++)
1784 debug((" %02x", p
[i
]));
1790 static void sha_mpint(SHA_State
* s
, Bignum b
)
1794 p
= ssh2_mpint_fmt(b
, &len
);
1795 sha_string(s
, p
, len
);
1800 * Packet decode functions for both SSH1 and SSH2.
1802 static unsigned long ssh_pkt_getuint32(struct Packet
*pkt
)
1804 unsigned long value
;
1805 if (pkt
->length
- pkt
->savedpos
< 4)
1806 return 0; /* arrgh, no way to decline (FIXME?) */
1807 value
= GET_32BIT(pkt
->body
+ pkt
->savedpos
);
1811 static int ssh2_pkt_getbool(struct Packet
*pkt
)
1813 unsigned long value
;
1814 if (pkt
->length
- pkt
->savedpos
< 1)
1815 return 0; /* arrgh, no way to decline (FIXME?) */
1816 value
= pkt
->body
[pkt
->savedpos
] != 0;
1820 static void ssh_pkt_getstring(struct Packet
*pkt
, char **p
, int *length
)
1825 if (pkt
->length
- pkt
->savedpos
< 4)
1827 len
= GET_32BIT(pkt
->body
+ pkt
->savedpos
);
1832 if (pkt
->length
- pkt
->savedpos
< *length
)
1834 *p
= (char *)(pkt
->body
+ pkt
->savedpos
);
1835 pkt
->savedpos
+= *length
;
1837 static void *ssh_pkt_getdata(struct Packet
*pkt
, int length
)
1839 if (pkt
->length
- pkt
->savedpos
< length
)
1841 pkt
->savedpos
+= length
;
1842 return pkt
->body
+ (pkt
->savedpos
- length
);
1844 static int ssh1_pkt_getrsakey(struct Packet
*pkt
, struct RSAKey
*key
,
1845 unsigned char **keystr
)
1849 j
= makekey(pkt
->body
+ pkt
->savedpos
,
1850 pkt
->length
- pkt
->savedpos
,
1857 assert(pkt
->savedpos
< pkt
->length
);
1861 static Bignum
ssh1_pkt_getmp(struct Packet
*pkt
)
1866 j
= ssh1_read_bignum(pkt
->body
+ pkt
->savedpos
,
1867 pkt
->length
- pkt
->savedpos
, &b
);
1875 static Bignum
ssh2_pkt_getmp(struct Packet
*pkt
)
1881 ssh_pkt_getstring(pkt
, &p
, &length
);
1886 b
= bignum_from_bytes((unsigned char *)p
, length
);
1891 * Helper function to add an SSH2 signature blob to a packet.
1892 * Expects to be shown the public key blob as well as the signature
1893 * blob. Normally works just like ssh2_pkt_addstring, but will
1894 * fiddle with the signature packet if necessary for
1895 * BUG_SSH2_RSA_PADDING.
1897 static void ssh2_add_sigblob(Ssh ssh
, struct Packet
*pkt
,
1898 void *pkblob_v
, int pkblob_len
,
1899 void *sigblob_v
, int sigblob_len
)
1901 unsigned char *pkblob
= (unsigned char *)pkblob_v
;
1902 unsigned char *sigblob
= (unsigned char *)sigblob_v
;
1904 /* dmemdump(pkblob, pkblob_len); */
1905 /* dmemdump(sigblob, sigblob_len); */
1908 * See if this is in fact an ssh-rsa signature and a buggy
1909 * server; otherwise we can just do this the easy way.
1911 if ((ssh
->remote_bugs
& BUG_SSH2_RSA_PADDING
) &&
1912 (GET_32BIT(pkblob
) == 7 && !memcmp(pkblob
+4, "ssh-rsa", 7))) {
1913 int pos
, len
, siglen
;
1916 * Find the byte length of the modulus.
1919 pos
= 4+7; /* skip over "ssh-rsa" */
1920 pos
+= 4 + GET_32BIT(pkblob
+pos
); /* skip over exponent */
1921 len
= GET_32BIT(pkblob
+pos
); /* find length of modulus */
1922 pos
+= 4; /* find modulus itself */
1923 while (len
> 0 && pkblob
[pos
] == 0)
1925 /* debug(("modulus length is %d\n", len)); */
1928 * Now find the signature integer.
1930 pos
= 4+7; /* skip over "ssh-rsa" */
1931 siglen
= GET_32BIT(sigblob
+pos
);
1932 /* debug(("signature length is %d\n", siglen)); */
1934 if (len
!= siglen
) {
1935 unsigned char newlen
[4];
1936 ssh2_pkt_addstring_start(pkt
);
1937 ssh2_pkt_addstring_data(pkt
, (char *)sigblob
, pos
);
1938 /* dmemdump(sigblob, pos); */
1939 pos
+= 4; /* point to start of actual sig */
1940 PUT_32BIT(newlen
, len
);
1941 ssh2_pkt_addstring_data(pkt
, (char *)newlen
, 4);
1942 /* dmemdump(newlen, 4); */
1944 while (len
-- > siglen
) {
1945 ssh2_pkt_addstring_data(pkt
, (char *)newlen
, 1);
1946 /* dmemdump(newlen, 1); */
1948 ssh2_pkt_addstring_data(pkt
, (char *)(sigblob
+pos
), siglen
);
1949 /* dmemdump(sigblob+pos, siglen); */
1953 /* Otherwise fall through and do it the easy way. */
1956 ssh2_pkt_addstring_start(pkt
);
1957 ssh2_pkt_addstring_data(pkt
, (char *)sigblob
, sigblob_len
);
1961 * Examine the remote side's version string and compare it against
1962 * a list of known buggy implementations.
1964 static void ssh_detect_bugs(Ssh ssh
, char *vstring
)
1966 char *imp
; /* pointer to implementation part */
1968 imp
+= strcspn(imp
, "-");
1970 imp
+= strcspn(imp
, "-");
1973 ssh
->remote_bugs
= 0;
1975 if (ssh
->cfg
.sshbug_ignore1
== FORCE_ON
||
1976 (ssh
->cfg
.sshbug_ignore1
== AUTO
&&
1977 (!strcmp(imp
, "1.2.18") || !strcmp(imp
, "1.2.19") ||
1978 !strcmp(imp
, "1.2.20") || !strcmp(imp
, "1.2.21") ||
1979 !strcmp(imp
, "1.2.22") || !strcmp(imp
, "Cisco-1.25") ||
1980 !strcmp(imp
, "OSU_1.4alpha3") || !strcmp(imp
, "OSU_1.5alpha4")))) {
1982 * These versions don't support SSH1_MSG_IGNORE, so we have
1983 * to use a different defence against password length
1986 ssh
->remote_bugs
|= BUG_CHOKES_ON_SSH1_IGNORE
;
1987 logevent("We believe remote version has SSH1 ignore bug");
1990 if (ssh
->cfg
.sshbug_plainpw1
== FORCE_ON
||
1991 (ssh
->cfg
.sshbug_plainpw1
== AUTO
&&
1992 (!strcmp(imp
, "Cisco-1.25") || !strcmp(imp
, "OSU_1.4alpha3")))) {
1994 * These versions need a plain password sent; they can't
1995 * handle having a null and a random length of data after
1998 ssh
->remote_bugs
|= BUG_NEEDS_SSH1_PLAIN_PASSWORD
;
1999 logevent("We believe remote version needs a plain SSH1 password");
2002 if (ssh
->cfg
.sshbug_rsa1
== FORCE_ON
||
2003 (ssh
->cfg
.sshbug_rsa1
== AUTO
&&
2004 (!strcmp(imp
, "Cisco-1.25")))) {
2006 * These versions apparently have no clue whatever about
2007 * RSA authentication and will panic and die if they see
2008 * an AUTH_RSA message.
2010 ssh
->remote_bugs
|= BUG_CHOKES_ON_RSA
;
2011 logevent("We believe remote version can't handle RSA authentication");
2014 if (ssh
->cfg
.sshbug_hmac2
== FORCE_ON
||
2015 (ssh
->cfg
.sshbug_hmac2
== AUTO
&&
2016 !wc_match("* VShell", imp
) &&
2017 (wc_match("2.1.0*", imp
) || wc_match("2.0.*", imp
) ||
2018 wc_match("2.2.0*", imp
) || wc_match("2.3.0*", imp
) ||
2019 wc_match("2.1 *", imp
)))) {
2021 * These versions have the HMAC bug.
2023 ssh
->remote_bugs
|= BUG_SSH2_HMAC
;
2024 logevent("We believe remote version has SSH2 HMAC bug");
2027 if (ssh
->cfg
.sshbug_derivekey2
== FORCE_ON
||
2028 (ssh
->cfg
.sshbug_derivekey2
== AUTO
&&
2029 !wc_match("* VShell", imp
) &&
2030 (wc_match("2.0.0*", imp
) || wc_match("2.0.10*", imp
) ))) {
2032 * These versions have the key-derivation bug (failing to
2033 * include the literal shared secret in the hashes that
2034 * generate the keys).
2036 ssh
->remote_bugs
|= BUG_SSH2_DERIVEKEY
;
2037 logevent("We believe remote version has SSH2 key-derivation bug");
2040 if (ssh
->cfg
.sshbug_rsapad2
== FORCE_ON
||
2041 (ssh
->cfg
.sshbug_rsapad2
== AUTO
&&
2042 (wc_match("OpenSSH_2.[5-9]*", imp
) ||
2043 wc_match("OpenSSH_3.[0-2]*", imp
)))) {
2045 * These versions have the SSH2 RSA padding bug.
2047 ssh
->remote_bugs
|= BUG_SSH2_RSA_PADDING
;
2048 logevent("We believe remote version has SSH2 RSA padding bug");
2051 if (ssh
->cfg
.sshbug_pksessid2
== FORCE_ON
||
2052 (ssh
->cfg
.sshbug_pksessid2
== AUTO
&&
2053 wc_match("OpenSSH_2.[0-2]*", imp
))) {
2055 * These versions have the SSH2 session-ID bug in
2056 * public-key authentication.
2058 ssh
->remote_bugs
|= BUG_SSH2_PK_SESSIONID
;
2059 logevent("We believe remote version has SSH2 public-key-session-ID bug");
2062 if (ssh
->cfg
.sshbug_dhgex2
== FORCE_ON
) {
2064 * User specified the SSH2 DH GEX bug.
2066 ssh
->remote_bugs
|= BUG_SSH2_DH_GEX
;
2067 logevent("We believe remote version has SSH2 DH group exchange bug");
2072 * The `software version' part of an SSH version string is required
2073 * to contain no spaces or minus signs.
2075 static void ssh_fix_verstring(char *str
)
2077 /* Eat "SSH-<protoversion>-". */
2078 assert(*str
== 'S'); str
++;
2079 assert(*str
== 'S'); str
++;
2080 assert(*str
== 'H'); str
++;
2081 assert(*str
== '-'); str
++;
2082 while (*str
&& *str
!= '-') str
++;
2083 assert(*str
== '-'); str
++;
2085 /* Convert minus signs and spaces in the remaining string into
2088 if (*str
== '-' || *str
== ' ')
2094 static int do_ssh_init(Ssh ssh
, unsigned char c
)
2096 struct do_ssh_init_state
{
2104 crState(do_ssh_init_state
);
2106 crBegin(ssh
->do_ssh_init_crstate
);
2108 /* Search for the string "SSH-" in the input. */
2111 static const int transS
[] = { 1, 2, 2, 1 };
2112 static const int transH
[] = { 0, 0, 3, 0 };
2113 static const int transminus
[] = { 0, 0, 0, -1 };
2115 s
->i
= transS
[s
->i
];
2117 s
->i
= transH
[s
->i
];
2119 s
->i
= transminus
[s
->i
];
2124 crReturn(1); /* get another character */
2128 s
->vstring
= snewn(s
->vstrsize
, char);
2129 strcpy(s
->vstring
, "SSH-");
2133 crReturn(1); /* get another char */
2134 if (s
->vslen
>= s
->vstrsize
- 1) {
2136 s
->vstring
= sresize(s
->vstring
, s
->vstrsize
, char);
2138 s
->vstring
[s
->vslen
++] = c
;
2141 s
->version
[s
->i
] = '\0';
2143 } else if (s
->i
< sizeof(s
->version
) - 1)
2144 s
->version
[s
->i
++] = c
;
2145 } else if (c
== '\012')
2149 ssh
->agentfwd_enabled
= FALSE
;
2150 ssh
->rdpkt2_state
.incoming_sequence
= 0;
2152 s
->vstring
[s
->vslen
] = 0;
2153 s
->vstring
[strcspn(s
->vstring
, "\015\012")] = '\0';/* remove EOL chars */
2156 vlog
= snewn(20 + s
->vslen
, char);
2157 sprintf(vlog
, "Server version: %s", s
->vstring
);
2161 ssh_detect_bugs(ssh
, s
->vstring
);
2164 * Decide which SSH protocol version to support.
2167 /* Anything strictly below "2.0" means protocol 1 is supported. */
2168 s
->proto1
= ssh_versioncmp(s
->version
, "2.0") < 0;
2169 /* Anything greater or equal to "1.99" means protocol 2 is supported. */
2170 s
->proto2
= ssh_versioncmp(s
->version
, "1.99") >= 0;
2172 if (ssh
->cfg
.sshprot
== 0 && !s
->proto1
) {
2173 bombout(("SSH protocol version 1 required by user but not provided by server"));
2176 if (ssh
->cfg
.sshprot
== 3 && !s
->proto2
) {
2177 bombout(("SSH protocol version 2 required by user but not provided by server"));
2184 if (s
->proto2
&& (ssh
->cfg
.sshprot
>= 2 || !s
->proto1
)) {
2186 * Construct a v2 version string.
2188 verstring
= dupprintf("SSH-2.0-%s\015\012", sshver
);
2192 * Construct a v1 version string.
2194 verstring
= dupprintf("SSH-%s-%s\012",
2195 (ssh_versioncmp(s
->version
, "1.5") <= 0 ?
2196 s
->version
: "1.5"),
2201 ssh_fix_verstring(verstring
);
2203 if (ssh
->version
== 2) {
2205 * Hash our version string and their version string.
2207 SHA_Init(&ssh
->exhashbase
);
2208 sha_string(&ssh
->exhashbase
, verstring
,
2209 strcspn(verstring
, "\015\012"));
2210 sha_string(&ssh
->exhashbase
, s
->vstring
,
2211 strcspn(s
->vstring
, "\015\012"));
2214 * Initialise SSHv2 protocol.
2216 ssh
->protocol
= ssh2_protocol
;
2217 ssh2_protocol_setup(ssh
);
2218 ssh
->s_rdpkt
= ssh2_rdpkt
;
2221 * Initialise SSHv1 protocol.
2223 ssh
->protocol
= ssh1_protocol
;
2224 ssh1_protocol_setup(ssh
);
2225 ssh
->s_rdpkt
= ssh1_rdpkt
;
2227 logeventf(ssh
, "We claim version: %.*s",
2228 strcspn(verstring
, "\015\012"), verstring
);
2229 sk_write(ssh
->s
, verstring
, strlen(verstring
));
2233 logeventf(ssh
, "Using SSH protocol version %d", ssh
->version
);
2235 update_specials_menu(ssh
->frontend
);
2236 ssh
->state
= SSH_STATE_BEFORE_SIZE
;
2237 ssh
->pinger
= pinger_new(&ssh
->cfg
, &ssh_backend
, ssh
);
2244 static void ssh_gotdata(Ssh ssh
, unsigned char *data
, int datalen
)
2246 crBegin(ssh
->ssh_gotdata_crstate
);
2249 * To begin with, feed the characters one by one to the
2250 * protocol initialisation / selection function do_ssh_init().
2251 * When that returns 0, we're done with the initial greeting
2252 * exchange and can move on to packet discipline.
2255 int ret
; /* need not be kept across crReturn */
2257 crReturnV
; /* more data please */
2258 ret
= do_ssh_init(ssh
, *data
);
2266 * We emerge from that loop when the initial negotiation is
2267 * over and we have selected an s_rdpkt function. Now pass
2268 * everything to s_rdpkt, and then pass the resulting packets
2269 * to the proper protocol handler.
2274 while (datalen
> 0) {
2275 struct Packet
*pktin
= ssh
->s_rdpkt(ssh
, &data
, &datalen
);
2277 ssh
->protocol(ssh
, NULL
, 0, pktin
);
2278 ssh_free_packet(pktin
);
2280 if (ssh
->state
== SSH_STATE_CLOSED
)
2288 static void ssh_do_close(Ssh ssh
)
2291 struct ssh_channel
*c
;
2293 ssh
->state
= SSH_STATE_CLOSED
;
2297 notify_remote_exit(ssh
->frontend
);
2300 * Now we must shut down any port and X forwardings going
2301 * through this connection.
2303 if (ssh
->channels
) {
2304 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
2307 x11_close(c
->u
.x11
.s
);
2310 pfd_close(c
->u
.pfd
.s
);
2313 del234(ssh
->channels
, c
);
2314 if (ssh
->version
== 2)
2315 bufchain_clear(&c
->v
.v2
.outbuffer
);
2321 static int ssh_closing(Plug plug
, const char *error_msg
, int error_code
,
2324 Ssh ssh
= (Ssh
) plug
;
2327 /* A socket error has occurred. */
2328 logevent(error_msg
);
2329 connection_fatal(ssh
->frontend
, "%s", error_msg
);
2331 /* Otherwise, the remote side closed the connection normally. */
2336 static int ssh_receive(Plug plug
, int urgent
, char *data
, int len
)
2338 Ssh ssh
= (Ssh
) plug
;
2339 ssh_gotdata(ssh
, (unsigned char *)data
, len
);
2340 if (ssh
->state
== SSH_STATE_CLOSED
) {
2347 static void ssh_sent(Plug plug
, int bufsize
)
2349 Ssh ssh
= (Ssh
) plug
;
2351 * If the send backlog on the SSH socket itself clears, we
2352 * should unthrottle the whole world if it was throttled.
2354 if (bufsize
< SSH_MAX_BACKLOG
)
2355 ssh_throttle_all(ssh
, 0, bufsize
);
2359 * Connect to specified host and port.
2360 * Returns an error message, or NULL on success.
2361 * Also places the canonical host name into `realhost'. It must be
2362 * freed by the caller.
2364 static const char *connect_to_host(Ssh ssh
, char *host
, int port
,
2365 char **realhost
, int nodelay
, int keepalive
)
2367 static const struct plug_function_table fn_table
= {
2377 ssh
->savedhost
= snewn(1 + strlen(host
), char);
2378 if (!ssh
->savedhost
)
2379 fatalbox("Out of memory");
2380 strcpy(ssh
->savedhost
, host
);
2383 port
= 22; /* default ssh port */
2384 ssh
->savedport
= port
;
2389 logeventf(ssh
, "Looking up host \"%s\"", host
);
2390 addr
= name_lookup(host
, port
, realhost
, &ssh
->cfg
);
2391 if ((err
= sk_addr_error(addr
)) != NULL
) {
2401 sk_getaddr(addr
, addrbuf
, 100);
2402 logeventf(ssh
, "Connecting to %s port %d", addrbuf
, port
);
2404 ssh
->fn
= &fn_table
;
2405 ssh
->s
= new_connection(addr
, *realhost
, port
,
2406 0, 1, nodelay
, keepalive
, (Plug
) ssh
, &ssh
->cfg
);
2407 if ((err
= sk_socket_error(ssh
->s
)) != NULL
) {
2409 notify_remote_exit(ssh
->frontend
);
2417 * Throttle or unthrottle the SSH connection.
2419 static void ssh1_throttle(Ssh ssh
, int adjust
)
2421 int old_count
= ssh
->v1_throttle_count
;
2422 ssh
->v1_throttle_count
+= adjust
;
2423 assert(ssh
->v1_throttle_count
>= 0);
2424 if (ssh
->v1_throttle_count
&& !old_count
) {
2425 sk_set_frozen(ssh
->s
, 1);
2426 } else if (!ssh
->v1_throttle_count
&& old_count
) {
2427 sk_set_frozen(ssh
->s
, 0);
2432 * Throttle or unthrottle _all_ local data streams (for when sends
2433 * on the SSH connection itself back up).
2435 static void ssh_throttle_all(Ssh ssh
, int enable
, int bufsize
)
2438 struct ssh_channel
*c
;
2440 if (enable
== ssh
->throttled_all
)
2442 ssh
->throttled_all
= enable
;
2443 ssh
->overall_bufsize
= bufsize
;
2446 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
2448 case CHAN_MAINSESSION
:
2450 * This is treated separately, outside the switch.
2454 x11_override_throttle(c
->u
.x11
.s
, enable
);
2457 /* Agent channels require no buffer management. */
2460 pfd_override_throttle(c
->u
.pfd
.s
, enable
);
2467 * Username and password input, abstracted off into routines
2468 * reusable in several places - even between SSH1 and SSH2.
2471 /* Set up a username or password input loop on a given buffer. */
2472 static void setup_userpass_input(Ssh ssh
, char *buffer
, int buflen
, int echo
)
2474 ssh
->userpass_input_buffer
= buffer
;
2475 ssh
->userpass_input_buflen
= buflen
;
2476 ssh
->userpass_input_bufpos
= 0;
2477 ssh
->userpass_input_echo
= echo
;
2481 * Process some terminal data in the course of username/password
2482 * input. Returns >0 for success (line of input returned in
2483 * buffer), <0 for failure (user hit ^C/^D, bomb out and exit), 0
2484 * for inconclusive (keep waiting for more input please).
2486 static int process_userpass_input(Ssh ssh
, unsigned char *in
, int inlen
)
2491 switch (c
= *in
++) {
2494 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
] = 0;
2495 ssh
->userpass_input_buffer
[ssh
->userpass_input_buflen
-1] = 0;
2500 if (ssh
->userpass_input_bufpos
> 0) {
2501 if (ssh
->userpass_input_echo
)
2502 c_write_str(ssh
, "\b \b");
2503 ssh
->userpass_input_bufpos
--;
2508 while (ssh
->userpass_input_bufpos
> 0) {
2509 if (ssh
->userpass_input_echo
)
2510 c_write_str(ssh
, "\b \b");
2511 ssh
->userpass_input_bufpos
--;
2520 * This simplistic check for printability is disabled
2521 * when we're doing password input, because some people
2522 * have control characters in their passwords.o
2524 if ((!ssh
->userpass_input_echo
||
2525 (c
>= ' ' && c
<= '~') ||
2526 ((unsigned char) c
>= 160))
2527 && ssh
->userpass_input_bufpos
< ssh
->userpass_input_buflen
-1) {
2528 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
++] = c
;
2529 if (ssh
->userpass_input_echo
)
2530 c_write(ssh
, &c
, 1);
2538 static void ssh_agent_callback(void *sshv
, void *reply
, int replylen
)
2540 Ssh ssh
= (Ssh
) sshv
;
2542 ssh
->agent_response
= reply
;
2543 ssh
->agent_response_len
= replylen
;
2545 if (ssh
->version
== 1)
2546 do_ssh1_login(ssh
, NULL
, -1, NULL
);
2548 do_ssh2_authconn(ssh
, NULL
, -1, NULL
);
2551 static void ssh_agentf_callback(void *cv
, void *reply
, int replylen
)
2553 struct ssh_channel
*c
= (struct ssh_channel
*)cv
;
2555 void *sentreply
= reply
;
2558 /* Fake SSH_AGENT_FAILURE. */
2559 sentreply
= "\0\0\0\1\5";
2562 if (ssh
->version
== 2) {
2563 ssh2_add_channel_data(c
, sentreply
, replylen
);
2566 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
2567 PKT_INT
, c
->remoteid
,
2570 PKT_DATA
, sentreply
, replylen
,
2579 * Handle the key exchange and user authentication phases.
2581 static int do_ssh1_login(Ssh ssh
, unsigned char *in
, int inlen
,
2582 struct Packet
*pktin
)
2585 unsigned char cookie
[8], *ptr
;
2586 struct RSAKey servkey
, hostkey
;
2587 struct MD5Context md5c
;
2588 struct do_ssh1_login_state
{
2590 unsigned char *rsabuf
, *keystr1
, *keystr2
;
2591 unsigned long supported_ciphers_mask
, supported_auths_mask
;
2592 int tried_publickey
, tried_agent
;
2593 int tis_auth_refused
, ccard_auth_refused
;
2594 unsigned char session_id
[16];
2597 void *publickey_blob
;
2598 int publickey_bloblen
;
2604 unsigned char request
[5], *response
, *p
;
2613 crState(do_ssh1_login_state
);
2615 crBegin(ssh
->do_ssh1_login_crstate
);
2620 if (pktin
->type
!= SSH1_SMSG_PUBLIC_KEY
) {
2621 bombout(("Public key packet not received"));
2625 logevent("Received public keys");
2627 ptr
= ssh_pkt_getdata(pktin
, 8);
2629 bombout(("SSH1 public key packet stopped before random cookie"));
2632 memcpy(cookie
, ptr
, 8);
2634 if (!ssh1_pkt_getrsakey(pktin
, &servkey
, &s
->keystr1
) ||
2635 !ssh1_pkt_getrsakey(pktin
, &hostkey
, &s
->keystr2
)) {
2636 bombout(("Failed to read SSH1 public keys from public key packet"));
2641 * Log the host key fingerprint.
2645 logevent("Host key fingerprint is:");
2646 strcpy(logmsg
, " ");
2647 hostkey
.comment
= NULL
;
2648 rsa_fingerprint(logmsg
+ strlen(logmsg
),
2649 sizeof(logmsg
) - strlen(logmsg
), &hostkey
);
2653 ssh
->v1_remote_protoflags
= ssh_pkt_getuint32(pktin
);
2654 s
->supported_ciphers_mask
= ssh_pkt_getuint32(pktin
);
2655 s
->supported_auths_mask
= ssh_pkt_getuint32(pktin
);
2657 ssh
->v1_local_protoflags
=
2658 ssh
->v1_remote_protoflags
& SSH1_PROTOFLAGS_SUPPORTED
;
2659 ssh
->v1_local_protoflags
|= SSH1_PROTOFLAG_SCREEN_NUMBER
;
2662 MD5Update(&md5c
, s
->keystr2
, hostkey
.bytes
);
2663 MD5Update(&md5c
, s
->keystr1
, servkey
.bytes
);
2664 MD5Update(&md5c
, cookie
, 8);
2665 MD5Final(s
->session_id
, &md5c
);
2667 for (i
= 0; i
< 32; i
++)
2668 ssh
->session_key
[i
] = random_byte();
2671 * Verify that the `bits' and `bytes' parameters match.
2673 if (hostkey
.bits
> hostkey
.bytes
* 8 ||
2674 servkey
.bits
> servkey
.bytes
* 8) {
2675 bombout(("SSH1 public keys were badly formatted"));
2679 s
->len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
2681 s
->rsabuf
= snewn(s
->len
, unsigned char);
2683 fatalbox("Out of memory");
2686 * Verify the host key.
2690 * First format the key into a string.
2692 int len
= rsastr_len(&hostkey
);
2693 char fingerprint
[100];
2694 char *keystr
= snewn(len
, char);
2696 fatalbox("Out of memory");
2697 rsastr_fmt(keystr
, &hostkey
);
2698 rsa_fingerprint(fingerprint
, sizeof(fingerprint
), &hostkey
);
2699 verify_ssh_host_key(ssh
->frontend
,
2700 ssh
->savedhost
, ssh
->savedport
, "rsa", keystr
,
2705 for (i
= 0; i
< 32; i
++) {
2706 s
->rsabuf
[i
] = ssh
->session_key
[i
];
2708 s
->rsabuf
[i
] ^= s
->session_id
[i
];
2711 if (hostkey
.bytes
> servkey
.bytes
) {
2712 ret
= rsaencrypt(s
->rsabuf
, 32, &servkey
);
2714 ret
= rsaencrypt(s
->rsabuf
, servkey
.bytes
, &hostkey
);
2716 ret
= rsaencrypt(s
->rsabuf
, 32, &hostkey
);
2718 ret
= rsaencrypt(s
->rsabuf
, hostkey
.bytes
, &servkey
);
2721 bombout(("SSH1 public key encryptions failed due to bad formatting"));
2725 logevent("Encrypted session key");
2728 int cipher_chosen
= 0, warn
= 0;
2729 char *cipher_string
= NULL
;
2731 for (i
= 0; !cipher_chosen
&& i
< CIPHER_MAX
; i
++) {
2732 int next_cipher
= ssh
->cfg
.ssh_cipherlist
[i
];
2733 if (next_cipher
== CIPHER_WARN
) {
2734 /* If/when we choose a cipher, warn about it */
2736 } else if (next_cipher
== CIPHER_AES
) {
2737 /* XXX Probably don't need to mention this. */
2738 logevent("AES not supported in SSH1, skipping");
2740 switch (next_cipher
) {
2741 case CIPHER_3DES
: s
->cipher_type
= SSH_CIPHER_3DES
;
2742 cipher_string
= "3DES"; break;
2743 case CIPHER_BLOWFISH
: s
->cipher_type
= SSH_CIPHER_BLOWFISH
;
2744 cipher_string
= "Blowfish"; break;
2745 case CIPHER_DES
: s
->cipher_type
= SSH_CIPHER_DES
;
2746 cipher_string
= "single-DES"; break;
2748 if (s
->supported_ciphers_mask
& (1 << s
->cipher_type
))
2752 if (!cipher_chosen
) {
2753 if ((s
->supported_ciphers_mask
& (1 << SSH_CIPHER_3DES
)) == 0)
2754 bombout(("Server violates SSH 1 protocol by not "
2755 "supporting 3DES encryption"));
2757 /* shouldn't happen */
2758 bombout(("No supported ciphers found"));
2762 /* Warn about chosen cipher if necessary. */
2764 askcipher(ssh
->frontend
, cipher_string
, 0);
2767 switch (s
->cipher_type
) {
2768 case SSH_CIPHER_3DES
:
2769 logevent("Using 3DES encryption");
2771 case SSH_CIPHER_DES
:
2772 logevent("Using single-DES encryption");
2774 case SSH_CIPHER_BLOWFISH
:
2775 logevent("Using Blowfish encryption");
2779 send_packet(ssh
, SSH1_CMSG_SESSION_KEY
,
2780 PKT_CHAR
, s
->cipher_type
,
2781 PKT_DATA
, cookie
, 8,
2782 PKT_CHAR
, (s
->len
* 8) >> 8, PKT_CHAR
, (s
->len
* 8) & 0xFF,
2783 PKT_DATA
, s
->rsabuf
, s
->len
,
2784 PKT_INT
, ssh
->v1_local_protoflags
, PKT_END
);
2786 logevent("Trying to enable encryption...");
2790 ssh
->cipher
= (s
->cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish_ssh1
:
2791 s
->cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
2793 ssh
->v1_cipher_ctx
= ssh
->cipher
->make_context();
2794 ssh
->cipher
->sesskey(ssh
->v1_cipher_ctx
, ssh
->session_key
);
2795 logeventf(ssh
, "Initialised %s encryption", ssh
->cipher
->text_name
);
2797 ssh
->crcda_ctx
= crcda_make_context();
2798 logevent("Installing CRC compensation attack detector");
2800 if (servkey
.modulus
) {
2801 sfree(servkey
.modulus
);
2802 servkey
.modulus
= NULL
;
2804 if (servkey
.exponent
) {
2805 sfree(servkey
.exponent
);
2806 servkey
.exponent
= NULL
;
2808 if (hostkey
.modulus
) {
2809 sfree(hostkey
.modulus
);
2810 hostkey
.modulus
= NULL
;
2812 if (hostkey
.exponent
) {
2813 sfree(hostkey
.exponent
);
2814 hostkey
.exponent
= NULL
;
2818 if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
2819 bombout(("Encryption not successfully enabled"));
2823 logevent("Successfully started encryption");
2827 if (!*ssh
->cfg
.username
) {
2828 if (ssh_get_line
&& !ssh_getline_pw_only
) {
2829 if (!ssh_get_line("login as: ",
2830 s
->username
, sizeof(s
->username
), FALSE
)) {
2832 * get_line failed to get a username.
2835 logevent("No username provided. Abandoning session.");
2836 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
2840 int ret
; /* need not be kept over crReturn */
2841 c_write_str(ssh
, "login as: ");
2844 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
2846 crWaitUntil(!pktin
);
2847 ret
= process_userpass_input(ssh
, in
, inlen
);
2851 c_write_str(ssh
, "\r\n");
2854 strncpy(s
->username
, ssh
->cfg
.username
, sizeof(s
->username
));
2855 s
->username
[sizeof(s
->username
)-1] = '\0';
2858 send_packet(ssh
, SSH1_CMSG_USER
, PKT_STR
, s
->username
, PKT_END
);
2860 char userlog
[22 + sizeof(s
->username
)];
2861 sprintf(userlog
, "Sent username \"%s\"", s
->username
);
2863 if (flags
& FLAG_INTERACTIVE
&&
2864 (!((flags
& FLAG_STDERR
) && (flags
& FLAG_VERBOSE
)))) {
2865 strcat(userlog
, "\r\n");
2866 c_write_str(ssh
, userlog
);
2873 if ((ssh
->remote_bugs
& BUG_CHOKES_ON_RSA
)) {
2874 /* We must not attempt PK auth. Pretend we've already tried it. */
2875 s
->tried_publickey
= s
->tried_agent
= 1;
2877 s
->tried_publickey
= s
->tried_agent
= 0;
2879 s
->tis_auth_refused
= s
->ccard_auth_refused
= 0;
2880 /* Load the public half of ssh->cfg.keyfile so we notice if it's in Pageant */
2881 if (!filename_is_null(ssh
->cfg
.keyfile
)) {
2882 if (!rsakey_pubblob(&ssh
->cfg
.keyfile
,
2883 &s
->publickey_blob
, &s
->publickey_bloblen
, NULL
))
2884 s
->publickey_blob
= NULL
;
2886 s
->publickey_blob
= NULL
;
2888 while (pktin
->type
== SSH1_SMSG_FAILURE
) {
2889 s
->pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
2891 if (agent_exists() && !s
->tried_agent
) {
2893 * Attempt RSA authentication using Pageant.
2899 logevent("Pageant is running. Requesting keys.");
2901 /* Request the keys held by the agent. */
2902 PUT_32BIT(s
->request
, 1);
2903 s
->request
[4] = SSH1_AGENTC_REQUEST_RSA_IDENTITIES
;
2904 if (!agent_query(s
->request
, 5, &r
, &s
->responselen
,
2905 ssh_agent_callback
, ssh
)) {
2909 bombout(("Unexpected data from server while waiting"
2910 " for agent response"));
2913 } while (pktin
|| inlen
> 0);
2914 r
= ssh
->agent_response
;
2915 s
->responselen
= ssh
->agent_response_len
;
2917 s
->response
= (unsigned char *) r
;
2918 if (s
->response
&& s
->responselen
>= 5 &&
2919 s
->response
[4] == SSH1_AGENT_RSA_IDENTITIES_ANSWER
) {
2920 s
->p
= s
->response
+ 5;
2921 s
->nkeys
= GET_32BIT(s
->p
);
2925 sprintf(buf
, "Pageant has %d SSH1 keys", s
->nkeys
);
2928 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
2931 sprintf(buf
, "Trying Pageant key #%d", s
->keyi
);
2934 if (s
->publickey_blob
&&
2935 !memcmp(s
->p
, s
->publickey_blob
,
2936 s
->publickey_bloblen
)) {
2937 logevent("This key matches configured key file");
2938 s
->tried_publickey
= 1;
2943 do { /* do while (0) to make breaking easy */
2944 n
= ssh1_read_bignum
2945 (s
->p
, s
->responselen
-(s
->p
-s
->response
),
2950 n
= ssh1_read_bignum
2951 (s
->p
, s
->responselen
-(s
->p
-s
->response
),
2956 if (s
->responselen
- (s
->p
-s
->response
) < 4)
2958 s
->commentlen
= GET_32BIT(s
->p
);
2960 if (s
->responselen
- (s
->p
-s
->response
) <
2963 s
->commentp
= (char *)s
->p
;
2964 s
->p
+= s
->commentlen
;
2968 logevent("Pageant key list packet was truncated");
2972 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
2973 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
2975 if (pktin
->type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
2976 logevent("Key refused");
2979 logevent("Received RSA challenge");
2980 if ((s
->challenge
= ssh1_pkt_getmp(pktin
)) == NULL
) {
2981 bombout(("Server's RSA challenge was badly formatted"));
2986 char *agentreq
, *q
, *ret
;
2989 len
= 1 + 4; /* message type, bit count */
2990 len
+= ssh1_bignum_length(s
->key
.exponent
);
2991 len
+= ssh1_bignum_length(s
->key
.modulus
);
2992 len
+= ssh1_bignum_length(s
->challenge
);
2993 len
+= 16; /* session id */
2994 len
+= 4; /* response format */
2995 agentreq
= snewn(4 + len
, char);
2996 PUT_32BIT(agentreq
, len
);
2998 *q
++ = SSH1_AGENTC_RSA_CHALLENGE
;
2999 PUT_32BIT(q
, bignum_bitcount(s
->key
.modulus
));
3001 q
+= ssh1_write_bignum(q
, s
->key
.exponent
);
3002 q
+= ssh1_write_bignum(q
, s
->key
.modulus
);
3003 q
+= ssh1_write_bignum(q
, s
->challenge
);
3004 memcpy(q
, s
->session_id
, 16);
3006 PUT_32BIT(q
, 1); /* response format */
3007 if (!agent_query(agentreq
, len
+ 4, &vret
, &retlen
,
3008 ssh_agent_callback
, ssh
)) {
3013 bombout(("Unexpected data from server"
3014 " while waiting for agent"
3018 } while (pktin
|| inlen
> 0);
3019 vret
= ssh
->agent_response
;
3020 retlen
= ssh
->agent_response_len
;
3025 if (ret
[4] == SSH1_AGENT_RSA_RESPONSE
) {
3026 logevent("Sending Pageant's response");
3027 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
3028 PKT_DATA
, ret
+ 5, 16,
3032 if (pktin
->type
== SSH1_SMSG_SUCCESS
) {
3034 ("Pageant's response accepted");
3035 if (flags
& FLAG_VERBOSE
) {
3036 c_write_str(ssh
, "Authenticated using"
3038 c_write(ssh
, s
->commentp
,
3040 c_write_str(ssh
, "\" from agent\r\n");
3045 ("Pageant's response not accepted");
3048 ("Pageant failed to answer challenge");
3052 logevent("No reply received from Pageant");
3055 freebn(s
->key
.exponent
);
3056 freebn(s
->key
.modulus
);
3057 freebn(s
->challenge
);
3066 if (!filename_is_null(ssh
->cfg
.keyfile
) && !s
->tried_publickey
)
3067 s
->pwpkt_type
= SSH1_CMSG_AUTH_RSA
;
3069 if (ssh
->cfg
.try_tis_auth
&&
3070 (s
->supported_auths_mask
& (1 << SSH1_AUTH_TIS
)) &&
3071 !s
->tis_auth_refused
) {
3072 s
->pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
3073 logevent("Requested TIS authentication");
3074 send_packet(ssh
, SSH1_CMSG_AUTH_TIS
, PKT_END
);
3076 if (pktin
->type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
3077 logevent("TIS authentication declined");
3078 if (flags
& FLAG_INTERACTIVE
)
3079 c_write_str(ssh
, "TIS authentication refused.\r\n");
3080 s
->tis_auth_refused
= 1;
3086 ssh_pkt_getstring(pktin
, &challenge
, &challengelen
);
3088 bombout(("TIS challenge packet was badly formed"));
3091 logevent("Received TIS challenge");
3092 if (challengelen
> sizeof(s
->prompt
) - 1)
3093 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
3094 memcpy(s
->prompt
, challenge
, challengelen
);
3095 /* Prompt heuristic comes from OpenSSH */
3096 strncpy(s
->prompt
+ challengelen
,
3097 memchr(s
->prompt
, '\n', challengelen
) ?
3098 "": "\r\nResponse: ",
3099 (sizeof s
->prompt
) - challengelen
);
3100 s
->prompt
[(sizeof s
->prompt
) - 1] = '\0';
3103 if (ssh
->cfg
.try_tis_auth
&&
3104 (s
->supported_auths_mask
& (1 << SSH1_AUTH_CCARD
)) &&
3105 !s
->ccard_auth_refused
) {
3106 s
->pwpkt_type
= SSH1_CMSG_AUTH_CCARD_RESPONSE
;
3107 logevent("Requested CryptoCard authentication");
3108 send_packet(ssh
, SSH1_CMSG_AUTH_CCARD
, PKT_END
);
3110 if (pktin
->type
!= SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
3111 logevent("CryptoCard authentication declined");
3112 c_write_str(ssh
, "CryptoCard authentication refused.\r\n");
3113 s
->ccard_auth_refused
= 1;
3119 ssh_pkt_getstring(pktin
, &challenge
, &challengelen
);
3121 bombout(("CryptoCard challenge packet was badly formed"));
3124 logevent("Received CryptoCard challenge");
3125 if (challengelen
> sizeof(s
->prompt
) - 1)
3126 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
3127 memcpy(s
->prompt
, challenge
, challengelen
);
3128 strncpy(s
->prompt
+ challengelen
,
3129 memchr(s
->prompt
, '\n', challengelen
) ?
3130 "" : "\r\nResponse: ",
3131 sizeof(s
->prompt
) - challengelen
);
3132 s
->prompt
[sizeof(s
->prompt
) - 1] = '\0';
3135 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
3136 sprintf(s
->prompt
, "%.90s@%.90s's password: ",
3137 s
->username
, ssh
->savedhost
);
3139 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
3140 char *comment
= NULL
;
3143 if (flags
& FLAG_VERBOSE
)
3144 c_write_str(ssh
, "Trying public key authentication.\r\n");
3145 logeventf(ssh
, "Trying public key \"%s\"",
3146 filename_to_str(&ssh
->cfg
.keyfile
));
3147 type
= key_type(&ssh
->cfg
.keyfile
);
3148 if (type
!= SSH_KEYTYPE_SSH1
) {
3149 sprintf(msgbuf
, "Key is of wrong type (%s)",
3150 key_type_to_str(type
));
3152 c_write_str(ssh
, msgbuf
);
3153 c_write_str(ssh
, "\r\n");
3154 s
->tried_publickey
= 1;
3157 if (!rsakey_encrypted(&ssh
->cfg
.keyfile
, &comment
)) {
3158 if (flags
& FLAG_VERBOSE
)
3159 c_write_str(ssh
, "No passphrase required.\r\n");
3162 sprintf(s
->prompt
, "Passphrase for key \"%.100s\": ", comment
);
3167 * Show password prompt, having first obtained it via a TIS
3168 * or CryptoCard exchange if we're doing TIS or CryptoCard
3172 if (!ssh_get_line(s
->prompt
, s
->password
,
3173 sizeof(s
->password
), TRUE
)) {
3175 * get_line failed to get a password (for example
3176 * because one was supplied on the command line
3177 * which has already failed to work). Terminate.
3179 send_packet(ssh
, SSH1_MSG_DISCONNECT
,
3180 PKT_STR
, "No more passwords available to try",
3182 logevent("Unable to authenticate");
3183 connection_fatal(ssh
->frontend
, "Unable to authenticate");
3184 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
3188 /* Prompt may have come from server. We've munged it a bit, so
3189 * we know it to be zero-terminated at least once. */
3190 int ret
; /* need not be saved over crReturn */
3191 c_write_untrusted(ssh
, s
->prompt
, strlen(s
->prompt
));
3194 setup_userpass_input(ssh
, s
->password
, sizeof(s
->password
), 0);
3196 crWaitUntil(!pktin
);
3197 ret
= process_userpass_input(ssh
, in
, inlen
);
3201 c_write_str(ssh
, "\r\n");
3205 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
3207 * Try public key authentication with the specified
3210 s
->tried_publickey
= 1;
3213 const char *error
= NULL
;
3214 int ret
= loadrsakey(&ssh
->cfg
.keyfile
, &s
->key
, s
->password
,
3217 c_write_str(ssh
, "Couldn't load private key from ");
3218 c_write_str(ssh
, filename_to_str(&ssh
->cfg
.keyfile
));
3219 c_write_str(ssh
, " (");
3220 c_write_str(ssh
, error
);
3221 c_write_str(ssh
, ").\r\n");
3222 continue; /* go and try password */
3225 c_write_str(ssh
, "Wrong passphrase.\r\n");
3226 s
->tried_publickey
= 0;
3227 continue; /* try again */
3232 * Send a public key attempt.
3234 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
3235 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
3238 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3239 c_write_str(ssh
, "Server refused our public key.\r\n");
3240 continue; /* go and try password */
3242 if (pktin
->type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
3243 bombout(("Bizarre response to offer of public key"));
3249 unsigned char buffer
[32];
3250 Bignum challenge
, response
;
3252 if ((challenge
= ssh1_pkt_getmp(pktin
)) == NULL
) {
3253 bombout(("Server's RSA challenge was badly formatted"));
3256 response
= rsadecrypt(challenge
, &s
->key
);
3257 freebn(s
->key
.private_exponent
);/* burn the evidence */
3259 for (i
= 0; i
< 32; i
++) {
3260 buffer
[i
] = bignum_byte(response
, 31 - i
);
3264 MD5Update(&md5c
, buffer
, 32);
3265 MD5Update(&md5c
, s
->session_id
, 16);
3266 MD5Final(buffer
, &md5c
);
3268 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
3269 PKT_DATA
, buffer
, 16, PKT_END
);
3276 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3277 if (flags
& FLAG_VERBOSE
)
3278 c_write_str(ssh
, "Failed to authenticate with"
3279 " our public key.\r\n");
3280 continue; /* go and try password */
3281 } else if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
3282 bombout(("Bizarre response to RSA authentication response"));
3286 break; /* we're through! */
3288 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
3290 * Defence against traffic analysis: we send a
3291 * whole bunch of packets containing strings of
3292 * different lengths. One of these strings is the
3293 * password, in a SSH1_CMSG_AUTH_PASSWORD packet.
3294 * The others are all random data in
3295 * SSH1_MSG_IGNORE packets. This way a passive
3296 * listener can't tell which is the password, and
3297 * hence can't deduce the password length.
3299 * Anybody with a password length greater than 16
3300 * bytes is going to have enough entropy in their
3301 * password that a listener won't find it _that_
3302 * much help to know how long it is. So what we'll
3305 * - if password length < 16, we send 15 packets
3306 * containing string lengths 1 through 15
3308 * - otherwise, we let N be the nearest multiple
3309 * of 8 below the password length, and send 8
3310 * packets containing string lengths N through
3311 * N+7. This won't obscure the order of
3312 * magnitude of the password length, but it will
3313 * introduce a bit of extra uncertainty.
3315 * A few servers (the old 1.2.18 through 1.2.22)
3316 * can't deal with SSH1_MSG_IGNORE. For these
3317 * servers, we need an alternative defence. We make
3318 * use of the fact that the password is interpreted
3319 * as a C string: so we can append a NUL, then some
3322 * One server (a Cisco one) can deal with neither
3323 * SSH1_MSG_IGNORE _nor_ a padded password string.
3324 * For this server we are left with no defences
3325 * against password length sniffing.
3327 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
)) {
3329 * The server can deal with SSH1_MSG_IGNORE, so
3330 * we can use the primary defence.
3332 int bottom
, top
, pwlen
, i
;
3335 pwlen
= strlen(s
->password
);
3337 bottom
= 0; /* zero length passwords are OK! :-) */
3340 bottom
= pwlen
& ~7;
3344 assert(pwlen
>= bottom
&& pwlen
<= top
);
3346 randomstr
= snewn(top
+ 1, char);
3348 for (i
= bottom
; i
<= top
; i
++) {
3350 defer_packet(ssh
, s
->pwpkt_type
,
3351 PKTT_PASSWORD
, PKT_STR
, s
->password
,
3352 PKTT_OTHER
, PKT_END
);
3354 for (j
= 0; j
< i
; j
++) {
3356 randomstr
[j
] = random_byte();
3357 } while (randomstr
[j
] == '\0');
3359 randomstr
[i
] = '\0';
3360 defer_packet(ssh
, SSH1_MSG_IGNORE
,
3361 PKT_STR
, randomstr
, PKT_END
);
3364 logevent("Sending password with camouflage packets");
3365 ssh_pkt_defersend(ssh
);
3368 else if (!(ssh
->remote_bugs
& BUG_NEEDS_SSH1_PLAIN_PASSWORD
)) {
3370 * The server can't deal with SSH1_MSG_IGNORE
3371 * but can deal with padded passwords, so we
3372 * can use the secondary defence.
3378 len
= strlen(s
->password
);
3379 if (len
< sizeof(string
)) {
3381 strcpy(string
, s
->password
);
3382 len
++; /* cover the zero byte */
3383 while (len
< sizeof(string
)) {
3384 string
[len
++] = (char) random_byte();
3389 logevent("Sending length-padded password");
3390 send_packet(ssh
, s
->pwpkt_type
, PKTT_PASSWORD
,
3391 PKT_INT
, len
, PKT_DATA
, ss
, len
,
3392 PKTT_OTHER
, PKT_END
);
3395 * The server has _both_
3396 * BUG_CHOKES_ON_SSH1_IGNORE and
3397 * BUG_NEEDS_SSH1_PLAIN_PASSWORD. There is
3398 * therefore nothing we can do.
3401 len
= strlen(s
->password
);
3402 logevent("Sending unpadded password");
3403 send_packet(ssh
, s
->pwpkt_type
,
3404 PKTT_PASSWORD
, PKT_INT
, len
,
3405 PKT_DATA
, s
->password
, len
,
3406 PKTT_OTHER
, PKT_END
);
3409 send_packet(ssh
, s
->pwpkt_type
, PKTT_PASSWORD
,
3410 PKT_STR
, s
->password
, PKTT_OTHER
, PKT_END
);
3413 logevent("Sent password");
3414 memset(s
->password
, 0, strlen(s
->password
));
3416 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3417 if (flags
& FLAG_VERBOSE
)
3418 c_write_str(ssh
, "Access denied\r\n");
3419 logevent("Authentication refused");
3420 } else if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
3421 bombout(("Strange packet received, type %d", pktin
->type
));
3426 logevent("Authentication successful");
3431 void sshfwd_close(struct ssh_channel
*c
)
3435 if (ssh
->state
!= SSH_STATE_SESSION
) {
3436 assert(ssh
->state
== SSH_STATE_CLOSED
);
3440 if (c
&& !c
->closes
) {
3442 * If the channel's remoteid is -1, we have sent
3443 * CHANNEL_OPEN for this channel, but it hasn't even been
3444 * acknowledged by the server. So we must set a close flag
3445 * on it now, and then when the server acks the channel
3446 * open, we can close it then.
3448 if (((int)c
->remoteid
) != -1) {
3449 if (ssh
->version
== 1) {
3450 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
, PKT_INT
, c
->remoteid
,
3453 struct Packet
*pktout
;
3454 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
3455 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
3456 ssh2_pkt_send(ssh
, pktout
);
3459 c
->closes
= 1; /* sent MSG_CLOSE */
3460 if (c
->type
== CHAN_X11
) {
3462 logevent("Forwarded X11 connection terminated");
3463 } else if (c
->type
== CHAN_SOCKDATA
||
3464 c
->type
== CHAN_SOCKDATA_DORMANT
) {
3466 logevent("Forwarded port closed");
3471 int sshfwd_write(struct ssh_channel
*c
, char *buf
, int len
)
3475 if (ssh
->state
!= SSH_STATE_SESSION
) {
3476 assert(ssh
->state
== SSH_STATE_CLOSED
);
3480 if (ssh
->version
== 1) {
3481 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
3482 PKT_INT
, c
->remoteid
,
3484 PKT_INT
, len
, PKT_DATA
, buf
, len
,
3485 PKTT_OTHER
, PKT_END
);
3487 * In SSH1 we can return 0 here - implying that forwarded
3488 * connections are never individually throttled - because
3489 * the only circumstance that can cause throttling will be
3490 * the whole SSH connection backing up, in which case
3491 * _everything_ will be throttled as a whole.
3495 ssh2_add_channel_data(c
, buf
, len
);
3496 return ssh2_try_send(c
);
3500 void sshfwd_unthrottle(struct ssh_channel
*c
, int bufsize
)
3504 if (ssh
->state
!= SSH_STATE_SESSION
) {
3505 assert(ssh
->state
== SSH_STATE_CLOSED
);
3509 if (ssh
->version
== 1) {
3510 if (c
->v
.v1
.throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
3511 c
->v
.v1
.throttling
= 0;
3512 ssh1_throttle(ssh
, -1);
3515 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
3519 static void ssh1_smsg_stdout_stderr_data(Ssh ssh
, struct Packet
*pktin
)
3522 int stringlen
, bufsize
;
3524 ssh_pkt_getstring(pktin
, &string
, &stringlen
);
3525 if (string
== NULL
) {
3526 bombout(("Incoming terminal data packet was badly formed"));
3530 bufsize
= from_backend(ssh
->frontend
, pktin
->type
== SSH1_SMSG_STDERR_DATA
,
3532 if (!ssh
->v1_stdout_throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
3533 ssh
->v1_stdout_throttling
= 1;
3534 ssh1_throttle(ssh
, +1);
3538 static void ssh1_smsg_x11_open(Ssh ssh
, struct Packet
*pktin
)
3540 /* Remote side is trying to open a channel to talk to our
3541 * X-Server. Give them back a local channel number. */
3542 struct ssh_channel
*c
;
3543 int remoteid
= ssh_pkt_getuint32(pktin
);
3545 logevent("Received X11 connect request");
3546 /* Refuse if X11 forwarding is disabled. */
3547 if (!ssh
->X11_fwd_enabled
) {
3548 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3549 PKT_INT
, remoteid
, PKT_END
);
3550 logevent("Rejected X11 connect request");
3552 c
= snew(struct ssh_channel
);
3555 if (x11_init(&c
->u
.x11
.s
, ssh
->cfg
.x11_display
, c
,
3556 ssh
->x11auth
, NULL
, -1, &ssh
->cfg
) != NULL
) {
3557 logevent("Opening X11 forward connection failed");
3559 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3560 PKT_INT
, remoteid
, PKT_END
);
3563 ("Opening X11 forward connection succeeded");
3564 c
->remoteid
= remoteid
;
3565 c
->localid
= alloc_channel_id(ssh
);
3567 c
->v
.v1
.throttling
= 0;
3568 c
->type
= CHAN_X11
; /* identify channel type */
3569 add234(ssh
->channels
, c
);
3570 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3571 PKT_INT
, c
->remoteid
, PKT_INT
,
3572 c
->localid
, PKT_END
);
3573 logevent("Opened X11 forward channel");
3578 static void ssh1_smsg_agent_open(Ssh ssh
, struct Packet
*pktin
)
3580 /* Remote side is trying to open a channel to talk to our
3581 * agent. Give them back a local channel number. */
3582 struct ssh_channel
*c
;
3583 int remoteid
= ssh_pkt_getuint32(pktin
);
3585 /* Refuse if agent forwarding is disabled. */
3586 if (!ssh
->agentfwd_enabled
) {
3587 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3588 PKT_INT
, remoteid
, PKT_END
);
3590 c
= snew(struct ssh_channel
);
3592 c
->remoteid
= remoteid
;
3593 c
->localid
= alloc_channel_id(ssh
);
3595 c
->v
.v1
.throttling
= 0;
3596 c
->type
= CHAN_AGENT
; /* identify channel type */
3597 c
->u
.a
.lensofar
= 0;
3598 add234(ssh
->channels
, c
);
3599 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3600 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
3605 static void ssh1_msg_port_open(Ssh ssh
, struct Packet
*pktin
)
3607 /* Remote side is trying to open a channel to talk to a
3608 * forwarded port. Give them back a local channel number. */
3609 struct ssh_channel
*c
;
3610 struct ssh_rportfwd pf
;
3613 char *host
, buf
[1024];
3615 c
= snew(struct ssh_channel
);
3618 remoteid
= ssh_pkt_getuint32(pktin
);
3619 ssh_pkt_getstring(pktin
, &host
, &hostsize
);
3620 port
= ssh_pkt_getuint32(pktin
);
3622 if (hostsize
>= lenof(pf
.dhost
))
3623 hostsize
= lenof(pf
.dhost
)-1;
3624 memcpy(pf
.dhost
, host
, hostsize
);
3625 pf
.dhost
[hostsize
] = '\0';
3628 if (find234(ssh
->rportfwds
, &pf
, NULL
) == NULL
) {
3629 sprintf(buf
, "Rejected remote port open request for %s:%d",
3632 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3633 PKT_INT
, remoteid
, PKT_END
);
3635 sprintf(buf
, "Received remote port open request for %s:%d",
3638 e
= pfd_newconnect(&c
->u
.pfd
.s
, pf
.dhost
, port
,
3642 sprintf(buf
, "Port open failed: %s", e
);
3645 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3646 PKT_INT
, remoteid
, PKT_END
);
3648 c
->remoteid
= remoteid
;
3649 c
->localid
= alloc_channel_id(ssh
);
3651 c
->v
.v1
.throttling
= 0;
3652 c
->type
= CHAN_SOCKDATA
; /* identify channel type */
3653 add234(ssh
->channels
, c
);
3654 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3655 PKT_INT
, c
->remoteid
, PKT_INT
,
3656 c
->localid
, PKT_END
);
3657 logevent("Forwarded port opened successfully");
3662 static void ssh1_msg_channel_open_confirmation(Ssh ssh
, struct Packet
*pktin
)
3664 unsigned int remoteid
= ssh_pkt_getuint32(pktin
);
3665 unsigned int localid
= ssh_pkt_getuint32(pktin
);
3666 struct ssh_channel
*c
;
3668 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
3669 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
3670 c
->remoteid
= localid
;
3671 c
->type
= CHAN_SOCKDATA
;
3672 c
->v
.v1
.throttling
= 0;
3673 pfd_confirm(c
->u
.pfd
.s
);
3676 if (c
&& c
->closes
) {
3678 * We have a pending close on this channel,
3679 * which we decided on before the server acked
3680 * the channel open. So now we know the
3681 * remoteid, we can close it again.
3683 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
,
3684 PKT_INT
, c
->remoteid
, PKT_END
);
3688 static void ssh1_msg_channel_open_failure(Ssh ssh
, struct Packet
*pktin
)
3690 unsigned int remoteid
= ssh_pkt_getuint32(pktin
);
3691 struct ssh_channel
*c
;
3693 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
3694 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
3695 logevent("Forwarded connection refused by server");
3696 pfd_close(c
->u
.pfd
.s
);
3697 del234(ssh
->channels
, c
);
3702 static void ssh1_msg_channel_close(Ssh ssh
, struct Packet
*pktin
)
3704 /* Remote side closes a channel. */
3705 unsigned i
= ssh_pkt_getuint32(pktin
);
3706 struct ssh_channel
*c
;
3707 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
3708 if (c
&& ((int)c
->remoteid
) != -1) {
3711 (pktin
->type
== SSH1_MSG_CHANNEL_CLOSE ?
1 : 2);
3713 if ((c
->closes
== 0) && (c
->type
== CHAN_X11
)) {
3714 logevent("Forwarded X11 connection terminated");
3715 assert(c
->u
.x11
.s
!= NULL
);
3716 x11_close(c
->u
.x11
.s
);
3719 if ((c
->closes
== 0) && (c
->type
== CHAN_SOCKDATA
)) {
3720 logevent("Forwarded port closed");
3721 assert(c
->u
.pfd
.s
!= NULL
);
3722 pfd_close(c
->u
.pfd
.s
);
3726 c
->closes
|= (closetype
<< 2); /* seen this message */
3727 if (!(c
->closes
& closetype
)) {
3728 send_packet(ssh
, pktin
->type
, PKT_INT
, c
->remoteid
,
3730 c
->closes
|= closetype
; /* sent it too */
3733 if (c
->closes
== 15) {
3734 del234(ssh
->channels
, c
);
3738 bombout(("Received CHANNEL_CLOSE%s for %s channel %d\n",
3739 pktin
->type
== SSH1_MSG_CHANNEL_CLOSE ?
"" :
3740 "_CONFIRMATION", c ?
"half-open" : "nonexistent",
3745 static void ssh1_msg_channel_data(Ssh ssh
, struct Packet
*pktin
)
3747 /* Data sent down one of our channels. */
3748 int i
= ssh_pkt_getuint32(pktin
);
3751 struct ssh_channel
*c
;
3753 ssh_pkt_getstring(pktin
, &p
, &len
);
3755 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
3760 bufsize
= x11_send(c
->u
.x11
.s
, p
, len
);
3763 bufsize
= pfd_send(c
->u
.pfd
.s
, p
, len
);
3766 /* Data for an agent message. Buffer it. */
3768 if (c
->u
.a
.lensofar
< 4) {
3769 int l
= min(4 - c
->u
.a
.lensofar
, len
);
3770 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
, p
,
3774 c
->u
.a
.lensofar
+= l
;
3776 if (c
->u
.a
.lensofar
== 4) {
3778 4 + GET_32BIT(c
->u
.a
.msglen
);
3779 c
->u
.a
.message
= snewn(c
->u
.a
.totallen
,
3781 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
3783 if (c
->u
.a
.lensofar
>= 4 && len
> 0) {
3785 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
3787 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
, p
,
3791 c
->u
.a
.lensofar
+= l
;
3793 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
3796 if (agent_query(c
->u
.a
.message
,
3799 ssh_agentf_callback
, c
))
3800 ssh_agentf_callback(c
, reply
, replylen
);
3801 sfree(c
->u
.a
.message
);
3802 c
->u
.a
.lensofar
= 0;
3805 bufsize
= 0; /* agent channels never back up */
3808 if (!c
->v
.v1
.throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
3809 c
->v
.v1
.throttling
= 1;
3810 ssh1_throttle(ssh
, +1);
3815 static void ssh1_smsg_exit_status(Ssh ssh
, struct Packet
*pktin
)
3818 ssh
->exitcode
= ssh_pkt_getuint32(pktin
);
3819 sprintf(buf
, "Server sent command exit status %d",
3822 send_packet(ssh
, SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
3824 * In case `helpful' firewalls or proxies tack
3825 * extra human-readable text on the end of the
3826 * session which we might mistake for another
3827 * encrypted packet, we close the session once
3828 * we've sent EXIT_CONFIRMATION.
3830 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
3833 static void do_ssh1_connection(Ssh ssh
, unsigned char *in
, int inlen
,
3834 struct Packet
*pktin
)
3836 crBegin(ssh
->do_ssh1_connection_crstate
);
3838 ssh
->packet_dispatch
[SSH1_SMSG_STDOUT_DATA
] =
3839 ssh
->packet_dispatch
[SSH1_SMSG_STDERR_DATA
] =
3840 ssh1_smsg_stdout_stderr_data
;
3842 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
] =
3843 ssh1_msg_channel_open_confirmation
;
3844 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_OPEN_FAILURE
] =
3845 ssh1_msg_channel_open_failure
;
3846 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_CLOSE
] =
3847 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
] =
3848 ssh1_msg_channel_close
;
3849 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_DATA
] = ssh1_msg_channel_data
;
3850 ssh
->packet_dispatch
[SSH1_SMSG_EXIT_STATUS
] = ssh1_smsg_exit_status
;
3852 if (ssh
->cfg
.agentfwd
&& agent_exists()) {
3853 logevent("Requesting agent forwarding");
3854 send_packet(ssh
, SSH1_CMSG_AGENT_REQUEST_FORWARDING
, PKT_END
);
3858 if (pktin
->type
!= SSH1_SMSG_SUCCESS
3859 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
3860 bombout(("Protocol confusion"));
3862 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3863 logevent("Agent forwarding refused");
3865 logevent("Agent forwarding enabled");
3866 ssh
->agentfwd_enabled
= TRUE
;
3867 ssh
->packet_dispatch
[SSH1_SMSG_AGENT_OPEN
] = ssh1_smsg_agent_open
;
3871 if (ssh
->cfg
.x11_forward
) {
3872 char proto
[20], data
[64];
3873 logevent("Requesting X11 forwarding");
3874 ssh
->x11auth
= x11_invent_auth(proto
, sizeof(proto
),
3875 data
, sizeof(data
), ssh
->cfg
.x11_auth
);
3876 x11_get_real_auth(ssh
->x11auth
, ssh
->cfg
.x11_display
);
3877 if (ssh
->v1_local_protoflags
& SSH1_PROTOFLAG_SCREEN_NUMBER
) {
3878 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
3879 PKT_STR
, proto
, PKT_STR
, data
,
3880 PKT_INT
, x11_get_screen_number(ssh
->cfg
.x11_display
),
3883 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
3884 PKT_STR
, proto
, PKT_STR
, data
, PKT_END
);
3889 if (pktin
->type
!= SSH1_SMSG_SUCCESS
3890 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
3891 bombout(("Protocol confusion"));
3893 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3894 logevent("X11 forwarding refused");
3896 logevent("X11 forwarding enabled");
3897 ssh
->X11_fwd_enabled
= TRUE
;
3898 ssh
->packet_dispatch
[SSH1_SMSG_X11_OPEN
] = ssh1_smsg_x11_open
;
3905 int sport
,dport
,sserv
,dserv
;
3906 char sports
[256], dports
[256], saddr
[256], host
[256];
3908 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh1
);
3909 /* Add port forwardings. */
3910 ssh
->portfwd_strptr
= ssh
->cfg
.portfwd
;
3911 while (*ssh
->portfwd_strptr
) {
3912 type
= *ssh
->portfwd_strptr
++;
3915 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= '\t') {
3916 if (*ssh
->portfwd_strptr
== ':') {
3918 * We've seen a colon in the middle of the
3919 * source port number. This means that
3920 * everything we've seen until now is the
3921 * source _address_, so we'll move it into
3922 * saddr and start sports from the beginning
3925 ssh
->portfwd_strptr
++;
3927 strcpy(saddr
, sports
);
3930 if (n
< 255) sports
[n
++] = *ssh
->portfwd_strptr
++;
3934 if (*ssh
->portfwd_strptr
== '\t')
3935 ssh
->portfwd_strptr
++;
3937 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= ':') {
3938 if (n
< 255) host
[n
++] = *ssh
->portfwd_strptr
++;
3941 if (*ssh
->portfwd_strptr
== ':')
3942 ssh
->portfwd_strptr
++;
3944 while (*ssh
->portfwd_strptr
) {
3945 if (n
< 255) dports
[n
++] = *ssh
->portfwd_strptr
++;
3948 ssh
->portfwd_strptr
++;
3949 dport
= atoi(dports
);
3953 dport
= net_service_lookup(dports
);
3955 logeventf(ssh
, "Service lookup failed for"
3956 " destination port \"%s\"", dports
);
3960 while (*ssh
->portfwd_strptr
) ssh
->portfwd_strptr
++;
3962 ssh
->portfwd_strptr
++; /* eat the NUL and move to next one */
3964 sport
= atoi(sports
);
3968 sport
= net_service_lookup(sports
);
3970 logeventf(ssh
, "Service lookup failed for source"
3971 " port \"%s\"", sports
);
3974 if (sport
&& dport
) {
3975 /* Set up a description of the source port. */
3976 static char *sportdesc
;
3977 sportdesc
= dupprintf("%.*s%.*s%.*s%.*s%d%.*s",
3978 (int)(*saddr?
strlen(saddr
):0), *saddr?saddr
:NULL
,
3979 (int)(*saddr?
1:0), ":",
3980 (int)(sserv ?
strlen(sports
) : 0), sports
,
3981 sserv
, "(", sport
, sserv
, ")");
3983 /* Verbose description of the destination port */
3984 char *dportdesc
= dupprintf("%s:%.*s%.*s%d%.*s",
3986 (int)(dserv ?
strlen(dports
) : 0), dports
,
3987 dserv
, "(", dport
, dserv
, ")");
3988 const char *err
= pfd_addforward(host
, dport
,
3989 *saddr ? saddr
: NULL
,
3990 sport
, ssh
, &ssh
->cfg
);
3992 logeventf(ssh
, "Local port %s forward to %s"
3993 " failed: %s", sportdesc
, dportdesc
, err
);
3995 logeventf(ssh
, "Local port %s forwarding to %s",
3996 sportdesc
, dportdesc
);
3999 } else if (type
== 'D') {
4000 const char *err
= pfd_addforward(NULL
, -1,
4001 *saddr ? saddr
: NULL
,
4002 sport
, ssh
, &ssh
->cfg
);
4004 logeventf(ssh
, "Local port %s SOCKS dynamic forward"
4005 " setup failed: %s", sportdesc
, err
);
4007 logeventf(ssh
, "Local port %s doing SOCKS"
4008 " dynamic forwarding", sportdesc
);
4011 struct ssh_rportfwd
*pf
;
4012 pf
= snew(struct ssh_rportfwd
);
4013 strcpy(pf
->dhost
, host
);
4017 "SSH1 cannot handle source address spec \"%s:%d\"; ignoring",
4020 if (add234(ssh
->rportfwds
, pf
) != pf
) {
4022 "Duplicate remote port forwarding to %s:%d",
4026 logeventf(ssh
, "Requesting remote port %.*s%.*s%d%.*s"
4027 " forward to %s:%.*s%.*s%d%.*s",
4028 (int)(sserv ?
strlen(sports
) : 0), sports
,
4029 sserv
, "(", sport
, sserv
, ")",
4031 (int)(dserv ?
strlen(dports
) : 0), dports
,
4032 dserv
, "(", dport
, dserv
, ")");
4033 send_packet(ssh
, SSH1_CMSG_PORT_FORWARD_REQUEST
,
4041 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4042 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4043 bombout(("Protocol confusion"));
4045 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4046 c_write_str(ssh
, "Server refused port"
4048 logevent("Server refused this port forwarding");
4050 logevent("Remote port forwarding enabled");
4051 ssh
->packet_dispatch
[SSH1_MSG_PORT_OPEN
] =
4061 if (!ssh
->cfg
.nopty
) {
4062 /* Unpick the terminal-speed string. */
4063 /* XXX perhaps we should allow no speeds to be sent. */
4064 ssh
->ospeed
= 38400; ssh
->ispeed
= 38400; /* last-resort defaults */
4065 sscanf(ssh
->cfg
.termspeed
, "%d,%d", &ssh
->ospeed
, &ssh
->ispeed
);
4066 /* Send the pty request. */
4067 send_packet(ssh
, SSH1_CMSG_REQUEST_PTY
,
4068 PKT_STR
, ssh
->cfg
.termtype
,
4069 PKT_INT
, ssh
->term_height
,
4070 PKT_INT
, ssh
->term_width
,
4071 PKT_INT
, 0, PKT_INT
, 0, /* width,height in pixels */
4072 PKT_CHAR
, 192, PKT_INT
, ssh
->ispeed
, /* TTY_OP_ISPEED */
4073 PKT_CHAR
, 193, PKT_INT
, ssh
->ospeed
, /* TTY_OP_OSPEED */
4074 PKT_CHAR
, 0, PKT_END
);
4075 ssh
->state
= SSH_STATE_INTERMED
;
4079 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4080 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4081 bombout(("Protocol confusion"));
4083 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4084 c_write_str(ssh
, "Server refused to allocate pty\r\n");
4085 ssh
->editing
= ssh
->echoing
= 1;
4087 logeventf(ssh
, "Allocated pty (ospeed %dbps, ispeed %dbps)",
4088 ssh
->ospeed
, ssh
->ispeed
);
4090 ssh
->editing
= ssh
->echoing
= 1;
4093 if (ssh
->cfg
.compression
) {
4094 send_packet(ssh
, SSH1_CMSG_REQUEST_COMPRESSION
, PKT_INT
, 6, PKT_END
);
4098 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4099 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4100 bombout(("Protocol confusion"));
4102 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4103 c_write_str(ssh
, "Server refused to compress\r\n");
4105 logevent("Started compression");
4106 ssh
->v1_compressing
= TRUE
;
4107 ssh
->cs_comp_ctx
= zlib_compress_init();
4108 logevent("Initialised zlib (RFC1950) compression");
4109 ssh
->sc_comp_ctx
= zlib_decompress_init();
4110 logevent("Initialised zlib (RFC1950) decompression");
4114 * Start the shell or command.
4116 * Special case: if the first-choice command is an SSH2
4117 * subsystem (hence not usable here) and the second choice
4118 * exists, we fall straight back to that.
4121 char *cmd
= ssh
->cfg
.remote_cmd_ptr
;
4123 if (ssh
->cfg
.ssh_subsys
&& ssh
->cfg
.remote_cmd_ptr2
) {
4124 cmd
= ssh
->cfg
.remote_cmd_ptr2
;
4125 ssh
->fallback_cmd
= TRUE
;
4128 send_packet(ssh
, SSH1_CMSG_EXEC_CMD
, PKT_STR
, cmd
, PKT_END
);
4130 send_packet(ssh
, SSH1_CMSG_EXEC_SHELL
, PKT_END
);
4131 logevent("Started session");
4134 ssh
->state
= SSH_STATE_SESSION
;
4135 if (ssh
->size_needed
)
4136 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
4137 if (ssh
->eof_needed
)
4138 ssh_special(ssh
, TS_EOF
);
4141 ldisc_send(ssh
->ldisc
, NULL
, 0, 0);/* cause ldisc to notice changes */
4143 ssh
->channels
= newtree234(ssh_channelcmp
);
4147 * By this point, most incoming packets are already being
4148 * handled by the dispatch table, and we need only pay
4149 * attention to the unusual ones.
4154 if (pktin
->type
== SSH1_SMSG_SUCCESS
) {
4155 /* may be from EXEC_SHELL on some servers */
4156 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4157 /* may be from EXEC_SHELL on some servers
4158 * if no pty is available or in other odd cases. Ignore */
4160 bombout(("Strange packet received: type %d", pktin
->type
));
4165 int len
= min(inlen
, 512);
4166 send_packet(ssh
, SSH1_CMSG_STDIN_DATA
, PKTT_DATA
,
4167 PKT_INT
, len
, PKT_DATA
, in
, len
,
4168 PKTT_OTHER
, PKT_END
);
4179 * Handle the top-level SSH2 protocol.
4181 static void ssh1_msg_debug(Ssh ssh
, struct Packet
*pktin
)
4186 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
4187 buf
= dupprintf("Remote debug message: %.*s", msglen
, msg
);
4192 static void ssh1_msg_disconnect(Ssh ssh
, struct Packet
*pktin
)
4194 /* log reason code in disconnect message */
4198 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
4199 bombout(("Server sent disconnect message:\n\"%.*s\"", msglen
, msg
));
4202 void ssh_msg_ignore(Ssh ssh
, struct Packet
*pktin
)
4204 /* Do nothing, because we're ignoring it! Duhh. */
4207 static void ssh1_protocol_setup(Ssh ssh
)
4212 * Most messages are handled by the coroutines.
4214 for (i
= 0; i
< 256; i
++)
4215 ssh
->packet_dispatch
[i
] = NULL
;
4218 * These special message types we install handlers for.
4220 ssh
->packet_dispatch
[SSH1_MSG_DISCONNECT
] = ssh1_msg_disconnect
;
4221 ssh
->packet_dispatch
[SSH1_MSG_IGNORE
] = ssh_msg_ignore
;
4222 ssh
->packet_dispatch
[SSH1_MSG_DEBUG
] = ssh1_msg_debug
;
4225 static void ssh1_protocol(Ssh ssh
, unsigned char *in
, int inlen
,
4226 struct Packet
*pktin
)
4228 if (ssh
->state
== SSH_STATE_CLOSED
)
4231 if (pktin
&& ssh
->packet_dispatch
[pktin
->type
]) {
4232 ssh
->packet_dispatch
[pktin
->type
](ssh
, pktin
);
4236 if (!ssh
->protocol_initial_phase_done
) {
4237 if (do_ssh1_login(ssh
, in
, inlen
, pktin
))
4238 ssh
->protocol_initial_phase_done
= TRUE
;
4243 do_ssh1_connection(ssh
, in
, inlen
, pktin
);
4247 * Utility routine for decoding comma-separated strings in KEXINIT.
4249 static int in_commasep_string(char *needle
, char *haystack
, int haylen
)
4252 if (!needle
|| !haystack
) /* protect against null pointers */
4254 needlen
= strlen(needle
);
4257 * Is it at the start of the string?
4259 if (haylen
>= needlen
&& /* haystack is long enough */
4260 !memcmp(needle
, haystack
, needlen
) && /* initial match */
4261 (haylen
== needlen
|| haystack
[needlen
] == ',')
4262 /* either , or EOS follows */
4266 * If not, search for the next comma and resume after that.
4267 * If no comma found, terminate.
4269 while (haylen
> 0 && *haystack
!= ',')
4270 haylen
--, haystack
++;
4273 haylen
--, haystack
++; /* skip over comma itself */
4278 * SSH2 key creation method.
4280 static void ssh2_mkkey(Ssh ssh
, Bignum K
, unsigned char *H
,
4281 unsigned char *sessid
, char chr
,
4282 unsigned char *keyspace
)
4285 /* First 20 bytes. */
4287 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
4289 SHA_Bytes(&s
, H
, 20);
4290 SHA_Bytes(&s
, &chr
, 1);
4291 SHA_Bytes(&s
, sessid
, 20);
4292 SHA_Final(&s
, keyspace
);
4293 /* Next 20 bytes. */
4295 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
4297 SHA_Bytes(&s
, H
, 20);
4298 SHA_Bytes(&s
, keyspace
, 20);
4299 SHA_Final(&s
, keyspace
+ 20);
4303 * Handle the SSH2 transport layer.
4305 static int do_ssh2_transport(Ssh ssh
, unsigned char *in
, int inlen
,
4306 struct Packet
*pktin
)
4308 struct do_ssh2_transport_state
{
4309 int nbits
, pbits
, warn
;
4310 Bignum p
, g
, e
, f
, K
;
4311 int kex_init_value
, kex_reply_value
;
4312 const struct ssh_mac
**maclist
;
4314 const struct ssh2_cipher
*cscipher_tobe
;
4315 const struct ssh2_cipher
*sccipher_tobe
;
4316 const struct ssh_mac
*csmac_tobe
;
4317 const struct ssh_mac
*scmac_tobe
;
4318 const struct ssh_compress
*cscomp_tobe
;
4319 const struct ssh_compress
*sccomp_tobe
;
4320 char *hostkeydata
, *sigdata
, *keystr
, *fingerprint
;
4321 int hostkeylen
, siglen
;
4322 void *hkey
; /* actual host key */
4323 unsigned char exchange_hash
[20];
4324 int n_preferred_ciphers
;
4325 const struct ssh2_ciphers
*preferred_ciphers
[CIPHER_MAX
];
4326 const struct ssh_compress
*preferred_comp
;
4328 struct Packet
*pktout
;
4330 crState(do_ssh2_transport_state
);
4332 crBegin(ssh
->do_ssh2_transport_crstate
);
4334 s
->cscipher_tobe
= s
->sccipher_tobe
= NULL
;
4335 s
->csmac_tobe
= s
->scmac_tobe
= NULL
;
4336 s
->cscomp_tobe
= s
->sccomp_tobe
= NULL
;
4343 * Set up the preferred ciphers. (NULL => warn below here)
4345 s
->n_preferred_ciphers
= 0;
4346 for (i
= 0; i
< CIPHER_MAX
; i
++) {
4347 switch (ssh
->cfg
.ssh_cipherlist
[i
]) {
4348 case CIPHER_BLOWFISH
:
4349 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_blowfish
;
4352 if (ssh
->cfg
.ssh2_des_cbc
) {
4353 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_des
;
4357 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_3des
;
4360 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_aes
;
4363 /* Flag for later. Don't bother if it's the last in
4365 if (i
< CIPHER_MAX
- 1) {
4366 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = NULL
;
4374 * Set up preferred compression.
4376 if (ssh
->cfg
.compression
)
4377 s
->preferred_comp
= &ssh_zlib
;
4379 s
->preferred_comp
= &ssh_comp_none
;
4382 * Be prepared to work around the buggy MAC problem.
4384 if (ssh
->remote_bugs
& BUG_SSH2_HMAC
)
4385 s
->maclist
= buggymacs
, s
->nmacs
= lenof(buggymacs
);
4387 s
->maclist
= macs
, s
->nmacs
= lenof(macs
);
4391 int i
, j
, cipherstr_started
;
4394 * Enable queueing of outgoing auth- or connection-layer
4395 * packets while we are in the middle of a key exchange.
4397 ssh
->queueing
= TRUE
;
4400 * Flag that KEX is in progress.
4402 ssh
->kex_in_progress
= TRUE
;
4405 * Construct and send our key exchange packet.
4407 s
->pktout
= ssh2_pkt_init(SSH2_MSG_KEXINIT
);
4408 for (i
= 0; i
< 16; i
++)
4409 ssh2_pkt_addbyte(s
->pktout
, (unsigned char) random_byte());
4410 /* List key exchange algorithms. */
4411 ssh2_pkt_addstring_start(s
->pktout
);
4412 for (i
= 0; i
< lenof(kex_algs
); i
++) {
4413 if (kex_algs
[i
] == &ssh_diffiehellman_gex
&&
4414 (ssh
->remote_bugs
& BUG_SSH2_DH_GEX
))
4416 ssh2_pkt_addstring_str(s
->pktout
, kex_algs
[i
]->name
);
4417 if (i
< lenof(kex_algs
) - 1)
4418 ssh2_pkt_addstring_str(s
->pktout
, ",");
4420 /* List server host key algorithms. */
4421 ssh2_pkt_addstring_start(s
->pktout
);
4422 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
4423 ssh2_pkt_addstring_str(s
->pktout
, hostkey_algs
[i
]->name
);
4424 if (i
< lenof(hostkey_algs
) - 1)
4425 ssh2_pkt_addstring_str(s
->pktout
, ",");
4427 /* List client->server encryption algorithms. */
4428 ssh2_pkt_addstring_start(s
->pktout
);
4429 cipherstr_started
= 0;
4430 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4431 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4432 if (!c
) continue; /* warning flag */
4433 for (j
= 0; j
< c
->nciphers
; j
++) {
4434 if (cipherstr_started
)
4435 ssh2_pkt_addstring_str(s
->pktout
, ",");
4436 ssh2_pkt_addstring_str(s
->pktout
, c
->list
[j
]->name
);
4437 cipherstr_started
= 1;
4440 /* List server->client encryption algorithms. */
4441 ssh2_pkt_addstring_start(s
->pktout
);
4442 cipherstr_started
= 0;
4443 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4444 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4445 if (!c
) continue; /* warning flag */
4446 for (j
= 0; j
< c
->nciphers
; j
++) {
4447 if (cipherstr_started
)
4448 ssh2_pkt_addstring_str(s
->pktout
, ",");
4449 ssh2_pkt_addstring_str(s
->pktout
, c
->list
[j
]->name
);
4450 cipherstr_started
= 1;
4453 /* List client->server MAC algorithms. */
4454 ssh2_pkt_addstring_start(s
->pktout
);
4455 for (i
= 0; i
< s
->nmacs
; i
++) {
4456 ssh2_pkt_addstring_str(s
->pktout
, s
->maclist
[i
]->name
);
4457 if (i
< s
->nmacs
- 1)
4458 ssh2_pkt_addstring_str(s
->pktout
, ",");
4460 /* List server->client MAC algorithms. */
4461 ssh2_pkt_addstring_start(s
->pktout
);
4462 for (i
= 0; i
< s
->nmacs
; i
++) {
4463 ssh2_pkt_addstring_str(s
->pktout
, s
->maclist
[i
]->name
);
4464 if (i
< s
->nmacs
- 1)
4465 ssh2_pkt_addstring_str(s
->pktout
, ",");
4467 /* List client->server compression algorithms. */
4468 ssh2_pkt_addstring_start(s
->pktout
);
4469 assert(lenof(compressions
) > 1);
4470 ssh2_pkt_addstring_str(s
->pktout
, s
->preferred_comp
->name
);
4471 for (i
= 0; i
< lenof(compressions
); i
++) {
4472 const struct ssh_compress
*c
= compressions
[i
];
4473 if (c
!= s
->preferred_comp
) {
4474 ssh2_pkt_addstring_str(s
->pktout
, ",");
4475 ssh2_pkt_addstring_str(s
->pktout
, c
->name
);
4478 /* List server->client compression algorithms. */
4479 ssh2_pkt_addstring_start(s
->pktout
);
4480 assert(lenof(compressions
) > 1);
4481 ssh2_pkt_addstring_str(s
->pktout
, s
->preferred_comp
->name
);
4482 for (i
= 0; i
< lenof(compressions
); i
++) {
4483 const struct ssh_compress
*c
= compressions
[i
];
4484 if (c
!= s
->preferred_comp
) {
4485 ssh2_pkt_addstring_str(s
->pktout
, ",");
4486 ssh2_pkt_addstring_str(s
->pktout
, c
->name
);
4489 /* List client->server languages. Empty list. */
4490 ssh2_pkt_addstring_start(s
->pktout
);
4491 /* List server->client languages. Empty list. */
4492 ssh2_pkt_addstring_start(s
->pktout
);
4493 /* First KEX packet does _not_ follow, because we're not that brave. */
4494 ssh2_pkt_addbool(s
->pktout
, FALSE
);
4496 ssh2_pkt_adduint32(s
->pktout
, 0);
4499 ssh
->exhash
= ssh
->exhashbase
;
4500 sha_string(&ssh
->exhash
, s
->pktout
->data
+ 5, s
->pktout
->length
- 5);
4502 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
4506 if (pktin
->length
> 5)
4507 sha_string(&ssh
->exhash
, pktin
->data
+ 5, pktin
->length
- 5);
4510 * Now examine the other side's KEXINIT to see what we're up
4517 if (pktin
->type
!= SSH2_MSG_KEXINIT
) {
4518 bombout(("expected key exchange packet from server"));
4522 ssh
->hostkey
= NULL
;
4523 s
->cscipher_tobe
= NULL
;
4524 s
->sccipher_tobe
= NULL
;
4525 s
->csmac_tobe
= NULL
;
4526 s
->scmac_tobe
= NULL
;
4527 s
->cscomp_tobe
= NULL
;
4528 s
->sccomp_tobe
= NULL
;
4529 pktin
->savedpos
+= 16; /* skip garbage cookie */
4530 ssh_pkt_getstring(pktin
, &str
, &len
); /* key exchange algorithms */
4531 for (i
= 0; i
< lenof(kex_algs
); i
++) {
4532 if (kex_algs
[i
] == &ssh_diffiehellman_gex
&&
4533 (ssh
->remote_bugs
& BUG_SSH2_DH_GEX
))
4535 if (in_commasep_string(kex_algs
[i
]->name
, str
, len
)) {
4536 ssh
->kex
= kex_algs
[i
];
4540 ssh_pkt_getstring(pktin
, &str
, &len
); /* host key algorithms */
4541 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
4542 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
4543 ssh
->hostkey
= hostkey_algs
[i
];
4547 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server cipher */
4549 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4550 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4554 for (j
= 0; j
< c
->nciphers
; j
++) {
4555 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
4556 s
->cscipher_tobe
= c
->list
[j
];
4561 if (s
->cscipher_tobe
) {
4563 askcipher(ssh
->frontend
, s
->cscipher_tobe
->name
, 1);
4567 if (!s
->cscipher_tobe
) {
4568 bombout(("Couldn't agree a client-to-server cipher (available: %s)",
4569 str ? str
: "(null)"));
4573 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client cipher */
4575 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4576 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4580 for (j
= 0; j
< c
->nciphers
; j
++) {
4581 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
4582 s
->sccipher_tobe
= c
->list
[j
];
4587 if (s
->sccipher_tobe
) {
4589 askcipher(ssh
->frontend
, s
->sccipher_tobe
->name
, 2);
4593 if (!s
->sccipher_tobe
) {
4594 bombout(("Couldn't agree a server-to-client cipher (available: %s)",
4595 str ? str
: "(null)"));
4599 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server mac */
4600 for (i
= 0; i
< s
->nmacs
; i
++) {
4601 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
4602 s
->csmac_tobe
= s
->maclist
[i
];
4606 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client mac */
4607 for (i
= 0; i
< s
->nmacs
; i
++) {
4608 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
4609 s
->scmac_tobe
= s
->maclist
[i
];
4613 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server compression */
4614 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
4615 const struct ssh_compress
*c
=
4616 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
4617 if (in_commasep_string(c
->name
, str
, len
)) {
4622 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client compression */
4623 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
4624 const struct ssh_compress
*c
=
4625 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
4626 if (in_commasep_string(c
->name
, str
, len
)) {
4634 * Work out the number of bits of key we will need from the key
4635 * exchange. We start with the maximum key length of either
4641 csbits
= s
->cscipher_tobe
->keylen
;
4642 scbits
= s
->sccipher_tobe
->keylen
;
4643 s
->nbits
= (csbits
> scbits ? csbits
: scbits
);
4645 /* The keys only have 160-bit entropy, since they're based on
4646 * a SHA-1 hash. So cap the key size at 160 bits. */
4651 * If we're doing Diffie-Hellman group exchange, start by
4652 * requesting a group.
4654 if (!ssh
->kex
->pdata
) {
4655 logevent("Doing Diffie-Hellman group exchange");
4656 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGEX
;
4658 * Work out how big a DH group we will need to allow that
4661 s
->pbits
= 512 << ((s
->nbits
- 1) / 64);
4662 s
->pktout
= ssh2_pkt_init(SSH2_MSG_KEX_DH_GEX_REQUEST
);
4663 ssh2_pkt_adduint32(s
->pktout
, s
->pbits
);
4664 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
4667 if (pktin
->type
!= SSH2_MSG_KEX_DH_GEX_GROUP
) {
4668 bombout(("expected key exchange group packet from server"));
4671 s
->p
= ssh2_pkt_getmp(pktin
);
4672 s
->g
= ssh2_pkt_getmp(pktin
);
4673 if (!s
->p
|| !s
->g
) {
4674 bombout(("unable to read mp-ints from incoming group packet"));
4677 ssh
->kex_ctx
= dh_setup_gex(s
->p
, s
->g
);
4678 s
->kex_init_value
= SSH2_MSG_KEX_DH_GEX_INIT
;
4679 s
->kex_reply_value
= SSH2_MSG_KEX_DH_GEX_REPLY
;
4681 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGROUP
;
4682 ssh
->kex_ctx
= dh_setup_group(ssh
->kex
);
4683 s
->kex_init_value
= SSH2_MSG_KEXDH_INIT
;
4684 s
->kex_reply_value
= SSH2_MSG_KEXDH_REPLY
;
4685 logeventf(ssh
, "Using Diffie-Hellman with standard group \"%s\"",
4686 ssh
->kex
->groupname
);
4689 logevent("Doing Diffie-Hellman key exchange");
4691 * Now generate and send e for Diffie-Hellman.
4693 s
->e
= dh_create_e(ssh
->kex_ctx
, s
->nbits
* 2);
4694 s
->pktout
= ssh2_pkt_init(s
->kex_init_value
);
4695 ssh2_pkt_addmp(s
->pktout
, s
->e
);
4696 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
4699 if (pktin
->type
!= s
->kex_reply_value
) {
4700 bombout(("expected key exchange reply packet from server"));
4703 ssh_pkt_getstring(pktin
, &s
->hostkeydata
, &s
->hostkeylen
);
4704 s
->f
= ssh2_pkt_getmp(pktin
);
4706 bombout(("unable to parse key exchange reply packet"));
4709 ssh_pkt_getstring(pktin
, &s
->sigdata
, &s
->siglen
);
4711 s
->K
= dh_find_K(ssh
->kex_ctx
, s
->f
);
4713 sha_string(&ssh
->exhash
, s
->hostkeydata
, s
->hostkeylen
);
4714 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
4715 sha_uint32(&ssh
->exhash
, s
->pbits
);
4716 sha_mpint(&ssh
->exhash
, s
->p
);
4717 sha_mpint(&ssh
->exhash
, s
->g
);
4719 sha_mpint(&ssh
->exhash
, s
->e
);
4720 sha_mpint(&ssh
->exhash
, s
->f
);
4721 sha_mpint(&ssh
->exhash
, s
->K
);
4722 SHA_Final(&ssh
->exhash
, s
->exchange_hash
);
4724 dh_cleanup(ssh
->kex_ctx
);
4725 ssh
->kex_ctx
= NULL
;
4728 debug(("Exchange hash is:\n"));
4729 dmemdump(s
->exchange_hash
, 20);
4732 s
->hkey
= ssh
->hostkey
->newkey(s
->hostkeydata
, s
->hostkeylen
);
4734 !ssh
->hostkey
->verifysig(s
->hkey
, s
->sigdata
, s
->siglen
,
4735 (char *)s
->exchange_hash
, 20)) {
4736 bombout(("Server's host key did not match the signature supplied"));
4741 * Authenticate remote host: verify host key. (We've already
4742 * checked the signature of the exchange hash.)
4744 s
->keystr
= ssh
->hostkey
->fmtkey(s
->hkey
);
4745 s
->fingerprint
= ssh
->hostkey
->fingerprint(s
->hkey
);
4746 verify_ssh_host_key(ssh
->frontend
,
4747 ssh
->savedhost
, ssh
->savedport
, ssh
->hostkey
->keytype
,
4748 s
->keystr
, s
->fingerprint
);
4749 if (s
->first_kex
) { /* don't bother logging this in rekeys */
4750 logevent("Host key fingerprint is:");
4751 logevent(s
->fingerprint
);
4753 sfree(s
->fingerprint
);
4755 ssh
->hostkey
->freekey(s
->hkey
);
4758 * The exchange hash from the very first key exchange is also
4759 * the session id, used in session key construction and
4763 memcpy(ssh
->v2_session_id
, s
->exchange_hash
,
4764 sizeof(s
->exchange_hash
));
4767 * Send SSH2_MSG_NEWKEYS.
4769 s
->pktout
= ssh2_pkt_init(SSH2_MSG_NEWKEYS
);
4770 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
4771 ssh
->outgoing_data_size
= 0; /* start counting from here */
4774 * We've sent client NEWKEYS, so create and initialise
4775 * client-to-server session keys.
4777 if (ssh
->cs_cipher_ctx
)
4778 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
4779 ssh
->cscipher
= s
->cscipher_tobe
;
4780 ssh
->cs_cipher_ctx
= ssh
->cscipher
->make_context();
4782 if (ssh
->cs_mac_ctx
)
4783 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
4784 ssh
->csmac
= s
->csmac_tobe
;
4785 ssh
->cs_mac_ctx
= ssh
->csmac
->make_context();
4787 if (ssh
->cs_comp_ctx
)
4788 ssh
->cscomp
->compress_cleanup(ssh
->cs_comp_ctx
);
4789 ssh
->cscomp
= s
->cscomp_tobe
;
4790 ssh
->cs_comp_ctx
= ssh
->cscomp
->compress_init();
4793 * Set IVs on client-to-server keys. Here we use the exchange
4794 * hash from the _first_ key exchange.
4797 unsigned char keyspace
[40];
4798 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'C',keyspace
);
4799 ssh
->cscipher
->setkey(ssh
->cs_cipher_ctx
, keyspace
);
4800 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'A',keyspace
);
4801 ssh
->cscipher
->setiv(ssh
->cs_cipher_ctx
, keyspace
);
4802 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'E',keyspace
);
4803 ssh
->csmac
->setkey(ssh
->cs_mac_ctx
, keyspace
);
4806 logeventf(ssh
, "Initialised %.200s client->server encryption",
4807 ssh
->cscipher
->text_name
);
4808 logeventf(ssh
, "Initialised %.200s client->server MAC algorithm",
4809 ssh
->csmac
->text_name
);
4810 if (ssh
->cscomp
->text_name
)
4811 logeventf(ssh
, "Initialised %s compression",
4812 ssh
->cscomp
->text_name
);
4815 * Now our end of the key exchange is complete, we can send all
4816 * our queued higher-layer packets.
4818 ssh
->queueing
= FALSE
;
4819 ssh2_pkt_queuesend(ssh
);
4822 * Expect SSH2_MSG_NEWKEYS from server.
4825 if (pktin
->type
!= SSH2_MSG_NEWKEYS
) {
4826 bombout(("expected new-keys packet from server"));
4829 ssh
->incoming_data_size
= 0; /* start counting from here */
4832 * We've seen server NEWKEYS, so create and initialise
4833 * server-to-client session keys.
4835 if (ssh
->sc_cipher_ctx
)
4836 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
4837 ssh
->sccipher
= s
->sccipher_tobe
;
4838 ssh
->sc_cipher_ctx
= ssh
->sccipher
->make_context();
4840 if (ssh
->sc_mac_ctx
)
4841 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
4842 ssh
->scmac
= s
->scmac_tobe
;
4843 ssh
->sc_mac_ctx
= ssh
->scmac
->make_context();
4845 if (ssh
->sc_comp_ctx
)
4846 ssh
->sccomp
->decompress_cleanup(ssh
->sc_comp_ctx
);
4847 ssh
->sccomp
= s
->sccomp_tobe
;
4848 ssh
->sc_comp_ctx
= ssh
->sccomp
->decompress_init();
4851 * Set IVs on server-to-client keys. Here we use the exchange
4852 * hash from the _first_ key exchange.
4855 unsigned char keyspace
[40];
4856 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'D',keyspace
);
4857 ssh
->sccipher
->setkey(ssh
->sc_cipher_ctx
, keyspace
);
4858 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'B',keyspace
);
4859 ssh
->sccipher
->setiv(ssh
->sc_cipher_ctx
, keyspace
);
4860 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'F',keyspace
);
4861 ssh
->scmac
->setkey(ssh
->sc_mac_ctx
, keyspace
);
4863 logeventf(ssh
, "Initialised %.200s server->client encryption",
4864 ssh
->sccipher
->text_name
);
4865 logeventf(ssh
, "Initialised %.200s server->client MAC algorithm",
4866 ssh
->scmac
->text_name
);
4867 if (ssh
->sccomp
->text_name
)
4868 logeventf(ssh
, "Initialised %s decompression",
4869 ssh
->sccomp
->text_name
);
4872 * Free key exchange data.
4876 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
4882 * Key exchange is over. Schedule a timer for our next rekey.
4884 ssh
->kex_in_progress
= FALSE
;
4885 ssh
->next_rekey
= schedule_timer(REKEY_TIMEOUT
, ssh2_timer
, ssh
);
4888 * If this is the first key exchange phase, we must pass the
4889 * SSH2_MSG_NEWKEYS packet to the next layer, not because it
4890 * wants to see it but because it will need time to initialise
4891 * itself before it sees an actual packet. In subsequent key
4892 * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because
4893 * it would only confuse the layer above.
4895 if (!s
->first_kex
) {
4901 * Now we're encrypting. Begin returning 1 to the protocol main
4902 * function so that other things can run on top of the
4903 * transport. If we ever see a KEXINIT, we must go back to the
4906 * We _also_ go back to the start if we see pktin==NULL and
4907 * inlen==-1, because this is a special signal meaning
4908 * `initiate client-driven rekey', and `in' contains a message
4909 * giving the reason for the rekey.
4911 while (!((pktin
&& pktin
->type
== SSH2_MSG_KEXINIT
) ||
4912 (!pktin
&& inlen
== -1))) {
4916 logevent("Server initiated key re-exchange");
4918 logevent((char *)in
);
4920 goto begin_key_exchange
;
4926 * Add data to an SSH2 channel output buffer.
4928 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
,
4931 bufchain_add(&c
->v
.v2
.outbuffer
, buf
, len
);
4935 * Attempt to send data on an SSH2 channel.
4937 static int ssh2_try_send(struct ssh_channel
*c
)
4940 struct Packet
*pktout
;
4942 while (c
->v
.v2
.remwindow
> 0 && bufchain_size(&c
->v
.v2
.outbuffer
) > 0) {
4945 bufchain_prefix(&c
->v
.v2
.outbuffer
, &data
, &len
);
4946 if ((unsigned)len
> c
->v
.v2
.remwindow
)
4947 len
= c
->v
.v2
.remwindow
;
4948 if ((unsigned)len
> c
->v
.v2
.remmaxpkt
)
4949 len
= c
->v
.v2
.remmaxpkt
;
4950 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA
);
4951 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
4952 dont_log_data(ssh
, pktout
, PKTLOG_OMIT
);
4953 ssh2_pkt_addstring_start(pktout
);
4954 ssh2_pkt_addstring_data(pktout
, data
, len
);
4955 end_log_omission(ssh
, pktout
);
4956 ssh2_pkt_send(ssh
, pktout
);
4957 bufchain_consume(&c
->v
.v2
.outbuffer
, len
);
4958 c
->v
.v2
.remwindow
-= len
;
4962 * After having sent as much data as we can, return the amount
4965 return bufchain_size(&c
->v
.v2
.outbuffer
);
4969 * Potentially enlarge the window on an SSH2 channel.
4971 static void ssh2_set_window(struct ssh_channel
*c
, unsigned newwin
)
4976 * Never send WINDOW_ADJUST for a channel that the remote side
4977 * already thinks it's closed; there's no point, since it won't
4978 * be sending any more data anyway.
4983 if (newwin
> c
->v
.v2
.locwindow
) {
4984 struct Packet
*pktout
;
4986 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
4987 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
4988 ssh2_pkt_adduint32(pktout
, newwin
- c
->v
.v2
.locwindow
);
4989 ssh2_pkt_send(ssh
, pktout
);
4990 c
->v
.v2
.locwindow
= newwin
;
4994 static void ssh2_msg_channel_window_adjust(Ssh ssh
, struct Packet
*pktin
)
4996 unsigned i
= ssh_pkt_getuint32(pktin
);
4997 struct ssh_channel
*c
;
4998 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
4999 if (c
&& !c
->closes
)
5000 c
->v
.v2
.remwindow
+= ssh_pkt_getuint32(pktin
);
5003 static void ssh2_msg_channel_data(Ssh ssh
, struct Packet
*pktin
)
5007 unsigned i
= ssh_pkt_getuint32(pktin
);
5008 struct ssh_channel
*c
;
5009 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5011 return; /* nonexistent channel */
5012 if (pktin
->type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
&&
5013 ssh_pkt_getuint32(pktin
) != SSH2_EXTENDED_DATA_STDERR
)
5014 return; /* extended but not stderr */
5015 ssh_pkt_getstring(pktin
, &data
, &length
);
5018 c
->v
.v2
.locwindow
-= length
;
5020 case CHAN_MAINSESSION
:
5022 from_backend(ssh
->frontend
, pktin
->type
==
5023 SSH2_MSG_CHANNEL_EXTENDED_DATA
,
5027 bufsize
= x11_send(c
->u
.x11
.s
, data
, length
);
5030 bufsize
= pfd_send(c
->u
.pfd
.s
, data
, length
);
5033 while (length
> 0) {
5034 if (c
->u
.a
.lensofar
< 4) {
5035 int l
= min(4 - c
->u
.a
.lensofar
, length
);
5036 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
,
5040 c
->u
.a
.lensofar
+= l
;
5042 if (c
->u
.a
.lensofar
== 4) {
5044 4 + GET_32BIT(c
->u
.a
.msglen
);
5045 c
->u
.a
.message
= snewn(c
->u
.a
.totallen
,
5047 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
5049 if (c
->u
.a
.lensofar
>= 4 && length
> 0) {
5051 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
5053 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
,
5057 c
->u
.a
.lensofar
+= l
;
5059 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
5062 if (agent_query(c
->u
.a
.message
,
5065 ssh_agentf_callback
, c
))
5066 ssh_agentf_callback(c
, reply
, replylen
);
5067 sfree(c
->u
.a
.message
);
5068 c
->u
.a
.lensofar
= 0;
5075 * If we are not buffering too much data,
5076 * enlarge the window again at the remote side.
5078 if (bufsize
< OUR_V2_WINSIZE
)
5079 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
5083 static void ssh2_msg_channel_eof(Ssh ssh
, struct Packet
*pktin
)
5085 unsigned i
= ssh_pkt_getuint32(pktin
);
5086 struct ssh_channel
*c
;
5088 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5090 return; /* nonexistent channel */
5092 if (c
->type
== CHAN_X11
) {
5094 * Remote EOF on an X11 channel means we should
5095 * wrap up and close the channel ourselves.
5097 x11_close(c
->u
.x11
.s
);
5099 } else if (c
->type
== CHAN_AGENT
) {
5101 } else if (c
->type
== CHAN_SOCKDATA
) {
5102 pfd_close(c
->u
.pfd
.s
);
5107 static void ssh2_msg_channel_close(Ssh ssh
, struct Packet
*pktin
)
5109 unsigned i
= ssh_pkt_getuint32(pktin
);
5110 struct ssh_channel
*c
;
5111 struct Packet
*pktout
;
5113 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5114 if (!c
|| ((int)c
->remoteid
) == -1) {
5115 bombout(("Received CHANNEL_CLOSE for %s channel %d\n",
5116 c ?
"half-open" : "nonexistent", i
));
5119 /* Do pre-close processing on the channel. */
5121 case CHAN_MAINSESSION
:
5122 ssh
->mainchan
= NULL
;
5123 update_specials_menu(ssh
->frontend
);
5126 if (c
->u
.x11
.s
!= NULL
)
5127 x11_close(c
->u
.x11
.s
);
5134 if (c
->u
.pfd
.s
!= NULL
)
5135 pfd_close(c
->u
.pfd
.s
);
5139 if (c
->closes
== 0) {
5140 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
5141 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5142 ssh2_pkt_send(ssh
, pktout
);
5144 del234(ssh
->channels
, c
);
5145 bufchain_clear(&c
->v
.v2
.outbuffer
);
5149 * See if that was the last channel left open.
5150 * (This is only our termination condition if we're
5151 * not running in -N mode.)
5153 if (!ssh
->cfg
.ssh_no_shell
&& count234(ssh
->channels
) == 0) {
5154 logevent("All channels closed. Disconnecting");
5157 * We used to send SSH_MSG_DISCONNECT here,
5158 * because I'd believed that _every_ conforming
5159 * SSH2 connection had to end with a disconnect
5160 * being sent by at least one side; apparently
5161 * I was wrong and it's perfectly OK to
5162 * unceremoniously slam the connection shut
5163 * when you're done, and indeed OpenSSH feels
5164 * this is more polite than sending a
5165 * DISCONNECT. So now we don't.
5167 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
5168 ssh2_pkt_adduint32(s
->pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
5169 ssh2_pkt_addstring(s
->pktout
, "All open channels closed");
5170 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
5171 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5173 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5177 static void ssh2_msg_channel_open_confirmation(Ssh ssh
, struct Packet
*pktin
)
5179 unsigned i
= ssh_pkt_getuint32(pktin
);
5180 struct ssh_channel
*c
;
5181 struct Packet
*pktout
;
5183 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5185 return; /* nonexistent channel */
5186 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
5187 return; /* dunno why they're confirming this */
5188 c
->remoteid
= ssh_pkt_getuint32(pktin
);
5189 c
->type
= CHAN_SOCKDATA
;
5190 c
->v
.v2
.remwindow
= ssh_pkt_getuint32(pktin
);
5191 c
->v
.v2
.remmaxpkt
= ssh_pkt_getuint32(pktin
);
5193 pfd_confirm(c
->u
.pfd
.s
);
5196 * We have a pending close on this channel,
5197 * which we decided on before the server acked
5198 * the channel open. So now we know the
5199 * remoteid, we can close it again.
5201 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
5202 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5203 ssh2_pkt_send(ssh
, pktout
);
5207 static void ssh2_msg_channel_open_failure(Ssh ssh
, struct Packet
*pktin
)
5209 static const char *const reasons
[] = {
5210 "<unknown reason code>",
5211 "Administratively prohibited",
5213 "Unknown channel type",
5214 "Resource shortage",
5216 unsigned i
= ssh_pkt_getuint32(pktin
);
5217 unsigned reason_code
;
5218 char *reason_string
;
5221 struct ssh_channel
*c
;
5222 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5224 return; /* nonexistent channel */
5225 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
5226 return; /* dunno why they're failing this */
5228 reason_code
= ssh_pkt_getuint32(pktin
);
5229 if (reason_code
>= lenof(reasons
))
5230 reason_code
= 0; /* ensure reasons[reason_code] in range */
5231 ssh_pkt_getstring(pktin
, &reason_string
, &reason_length
);
5232 message
= dupprintf("Forwarded connection refused by"
5233 " server: %s [%.*s]", reasons
[reason_code
],
5234 reason_length
, reason_string
);
5238 pfd_close(c
->u
.pfd
.s
);
5240 del234(ssh
->channels
, c
);
5244 static void ssh2_msg_channel_request(Ssh ssh
, struct Packet
*pktin
)
5248 int typelen
, want_reply
;
5249 int reply
= SSH2_MSG_CHANNEL_FAILURE
; /* default */
5250 struct ssh_channel
*c
;
5251 struct Packet
*pktout
;
5253 localid
= ssh_pkt_getuint32(pktin
);
5254 ssh_pkt_getstring(pktin
, &type
, &typelen
);
5255 want_reply
= ssh2_pkt_getbool(pktin
);
5258 * First, check that the channel exists. Otherwise,
5259 * we can instantly disconnect with a rude message.
5261 c
= find234(ssh
->channels
, &localid
, ssh_channelfind
);
5264 sprintf(buf
, "Received channel request for nonexistent"
5265 " channel %d", localid
);
5267 pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
5268 ssh2_pkt_adduint32(pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
5269 ssh2_pkt_addstring(pktout
, buf
);
5270 ssh2_pkt_addstring(pktout
, "en"); /* language tag */
5271 ssh2_pkt_send_noqueue(ssh
, pktout
);
5272 connection_fatal(ssh
->frontend
, "%s", buf
);
5273 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5278 * Having got the channel number, we now look at
5279 * the request type string to see if it's something
5282 if (c
== ssh
->mainchan
) {
5284 * We recognise "exit-status" and "exit-signal" on
5285 * the primary channel.
5287 if (typelen
== 11 &&
5288 !memcmp(type
, "exit-status", 11)) {
5290 ssh
->exitcode
= ssh_pkt_getuint32(pktin
);
5291 logeventf(ssh
, "Server sent command exit status %d",
5293 reply
= SSH2_MSG_CHANNEL_SUCCESS
;
5295 } else if (typelen
== 11 &&
5296 !memcmp(type
, "exit-signal", 11)) {
5298 int is_plausible
= TRUE
, is_int
= FALSE
;
5299 char *fmt_sig
= "", *fmt_msg
= "";
5301 int msglen
= 0, core
= FALSE
;
5302 /* ICK: older versions of OpenSSH (e.g. 3.4p1)
5303 * provide an `int' for the signal, despite its
5304 * having been a `string' in the drafts since at
5305 * least 2001. (Fixed in session.c 1.147.) Try to
5306 * infer which we can safely parse it as. */
5308 unsigned char *p
= pktin
->body
+
5310 long len
= pktin
->length
- pktin
->savedpos
;
5311 unsigned long num
= GET_32BIT(p
); /* what is it? */
5312 /* If it's 0, it hardly matters; assume string */
5316 int maybe_int
= FALSE
, maybe_str
= FALSE
;
5317 #define CHECK_HYPOTHESIS(offset, result) \
5320 if (q >= 0 && q+4 <= len) { \
5321 q = q + 4 + GET_32BIT(p+q); \
5322 if (q >= 0 && q+4 <= len && \
5323 (q = q + 4 + GET_32BIT(p+q)) && q == len) \
5327 CHECK_HYPOTHESIS(4+1, maybe_int
);
5328 CHECK_HYPOTHESIS(4+num
+1, maybe_str
);
5329 #undef CHECK_HYPOTHESIS
5330 if (maybe_int
&& !maybe_str
)
5332 else if (!maybe_int
&& maybe_str
)
5335 /* Crikey. Either or neither. Panic. */
5336 is_plausible
= FALSE
;
5341 /* Old non-standard OpenSSH. */
5342 int signum
= ssh_pkt_getuint32(pktin
);
5343 fmt_sig
= dupprintf(" %d", signum
);
5345 /* As per the drafts. */
5348 ssh_pkt_getstring(pktin
, &sig
, &siglen
);
5349 /* Signal name isn't supposed to be blank, but
5350 * let's cope gracefully if it is. */
5352 fmt_sig
= dupprintf(" \"%.*s\"",
5356 core
= ssh2_pkt_getbool(pktin
);
5357 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
5359 fmt_msg
= dupprintf(" (\"%.*s\")", msglen
, msg
);
5361 /* ignore lang tag */
5362 } /* else don't attempt to parse */
5363 logeventf(ssh
, "Server exited on signal%s%s%s",
5364 fmt_sig
, core ?
" (core dumped)" : "",
5366 if (*fmt_sig
) sfree(fmt_sig
);
5367 if (*fmt_msg
) sfree(fmt_msg
);
5368 reply
= SSH2_MSG_CHANNEL_SUCCESS
;
5373 * This is a channel request we don't know
5374 * about, so we now either ignore the request
5375 * or respond with CHANNEL_FAILURE, depending
5378 reply
= SSH2_MSG_CHANNEL_FAILURE
;
5381 pktout
= ssh2_pkt_init(reply
);
5382 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5383 ssh2_pkt_send(ssh
, pktout
);
5387 static void ssh2_msg_global_request(Ssh ssh
, struct Packet
*pktin
)
5390 int typelen
, want_reply
;
5391 struct Packet
*pktout
;
5393 ssh_pkt_getstring(pktin
, &type
, &typelen
);
5394 want_reply
= ssh2_pkt_getbool(pktin
);
5397 * We currently don't support any global requests
5398 * at all, so we either ignore the request or
5399 * respond with REQUEST_FAILURE, depending on
5403 pktout
= ssh2_pkt_init(SSH2_MSG_REQUEST_FAILURE
);
5404 ssh2_pkt_send(ssh
, pktout
);
5408 static void ssh2_msg_channel_open(Ssh ssh
, struct Packet
*pktin
)
5416 struct ssh_channel
*c
;
5417 unsigned remid
, winsize
, pktsize
;
5418 struct Packet
*pktout
;
5420 ssh_pkt_getstring(pktin
, &type
, &typelen
);
5421 c
= snew(struct ssh_channel
);
5424 remid
= ssh_pkt_getuint32(pktin
);
5425 winsize
= ssh_pkt_getuint32(pktin
);
5426 pktsize
= ssh_pkt_getuint32(pktin
);
5428 if (typelen
== 3 && !memcmp(type
, "x11", 3)) {
5431 ssh_pkt_getstring(pktin
, &peeraddr
, &peeraddrlen
);
5432 addrstr
= snewn(peeraddrlen
+1, char);
5433 memcpy(addrstr
, peeraddr
, peeraddrlen
);
5434 addrstr
[peeraddrlen
] = '\0';
5435 peerport
= ssh_pkt_getuint32(pktin
);
5437 logeventf(ssh
, "Received X11 connect request from %s:%d",
5440 if (!ssh
->X11_fwd_enabled
)
5441 error
= "X11 forwarding is not enabled";
5442 else if (x11_init(&c
->u
.x11
.s
, ssh
->cfg
.x11_display
, c
,
5443 ssh
->x11auth
, addrstr
, peerport
,
5444 &ssh
->cfg
) != NULL
) {
5445 error
= "Unable to open an X11 connection";
5447 logevent("Opening X11 forward connection succeeded");
5452 } else if (typelen
== 15 &&
5453 !memcmp(type
, "forwarded-tcpip", 15)) {
5454 struct ssh_rportfwd pf
, *realpf
;
5457 ssh_pkt_getstring(pktin
, &dummy
, &dummylen
);/* skip address */
5458 pf
.sport
= ssh_pkt_getuint32(pktin
);
5459 ssh_pkt_getstring(pktin
, &peeraddr
, &peeraddrlen
);
5460 peerport
= ssh_pkt_getuint32(pktin
);
5461 realpf
= find234(ssh
->rportfwds
, &pf
, NULL
);
5462 logeventf(ssh
, "Received remote port %d open request "
5463 "from %s:%d", pf
.sport
, peeraddr
, peerport
);
5464 if (realpf
== NULL
) {
5465 error
= "Remote port is not recognised";
5467 const char *e
= pfd_newconnect(&c
->u
.pfd
.s
,
5471 logeventf(ssh
, "Attempting to forward remote port to "
5472 "%s:%d", realpf
->dhost
, realpf
->dport
);
5474 logeventf(ssh
, "Port open failed: %s", e
);
5475 error
= "Port open failed";
5477 logevent("Forwarded port opened successfully");
5478 c
->type
= CHAN_SOCKDATA
;
5481 } else if (typelen
== 22 &&
5482 !memcmp(type
, "auth-agent@openssh.com", 3)) {
5483 if (!ssh
->agentfwd_enabled
)
5484 error
= "Agent forwarding is not enabled";
5486 c
->type
= CHAN_AGENT
; /* identify channel type */
5487 c
->u
.a
.lensofar
= 0;
5490 error
= "Unsupported channel type requested";
5493 c
->remoteid
= remid
;
5495 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_FAILURE
);
5496 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5497 ssh2_pkt_adduint32(pktout
, SSH2_OPEN_CONNECT_FAILED
);
5498 ssh2_pkt_addstring(pktout
, error
);
5499 ssh2_pkt_addstring(pktout
, "en"); /* language tag */
5500 ssh2_pkt_send(ssh
, pktout
);
5501 logeventf(ssh
, "Rejected channel open: %s", error
);
5504 c
->localid
= alloc_channel_id(ssh
);
5506 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
5507 c
->v
.v2
.remwindow
= winsize
;
5508 c
->v
.v2
.remmaxpkt
= pktsize
;
5509 bufchain_init(&c
->v
.v2
.outbuffer
);
5510 add234(ssh
->channels
, c
);
5511 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
);
5512 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5513 ssh2_pkt_adduint32(pktout
, c
->localid
);
5514 ssh2_pkt_adduint32(pktout
, c
->v
.v2
.locwindow
);
5515 ssh2_pkt_adduint32(pktout
, 0x4000UL
); /* our max pkt size */
5516 ssh2_pkt_send(ssh
, pktout
);
5521 * Handle the SSH2 userauth and connection layers.
5523 static void do_ssh2_authconn(Ssh ssh
, unsigned char *in
, int inlen
,
5524 struct Packet
*pktin
)
5526 struct do_ssh2_authconn_state
{
5528 AUTH_INVALID
, AUTH_PUBLICKEY_AGENT
, AUTH_PUBLICKEY_FILE
,
5530 AUTH_KEYBOARD_INTERACTIVE
5534 AUTH_TYPE_PUBLICKEY
,
5535 AUTH_TYPE_PUBLICKEY_OFFER_LOUD
,
5536 AUTH_TYPE_PUBLICKEY_OFFER_QUIET
,
5538 AUTH_TYPE_KEYBOARD_INTERACTIVE
,
5539 AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
5541 int gotit
, need_pw
, can_pubkey
, can_passwd
, can_keyb_inter
;
5542 int tried_pubkey_config
, tried_agent
, tried_keyb_inter
;
5543 int kbd_inter_running
;
5545 int num_prompts
, curr_prompt
, echo
;
5550 void *publickey_blob
;
5551 int publickey_bloblen
;
5552 unsigned char request
[5], *response
, *p
;
5556 char *pkblob
, *alg
, *commentp
;
5557 int pklen
, alglen
, commentlen
;
5558 int siglen
, retlen
, len
;
5559 char *q
, *agentreq
, *ret
;
5561 int num_env
, env_left
, env_ok
;
5562 struct Packet
*pktout
;
5564 crState(do_ssh2_authconn_state
);
5566 crBegin(ssh
->do_ssh2_authconn_crstate
);
5569 * Request userauth protocol, and await a response to it.
5571 s
->pktout
= ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST
);
5572 ssh2_pkt_addstring(s
->pktout
, "ssh-userauth");
5573 ssh2_pkt_send(ssh
, s
->pktout
);
5574 crWaitUntilV(pktin
);
5575 if (pktin
->type
!= SSH2_MSG_SERVICE_ACCEPT
) {
5576 bombout(("Server refused user authentication protocol"));
5581 * We repeat this whole loop, including the username prompt,
5582 * until we manage a successful authentication. If the user
5583 * types the wrong _password_, they can be sent back to the
5584 * beginning to try another username, if this is configured on.
5585 * (If they specify a username in the config, they are never
5586 * asked, even if they do give a wrong password.)
5588 * I think this best serves the needs of
5590 * - the people who have no configuration, no keys, and just
5591 * want to try repeated (username,password) pairs until they
5592 * type both correctly
5594 * - people who have keys and configuration but occasionally
5595 * need to fall back to passwords
5597 * - people with a key held in Pageant, who might not have
5598 * logged in to a particular machine before; so they want to
5599 * type a username, and then _either_ their key will be
5600 * accepted, _or_ they will type a password. If they mistype
5601 * the username they will want to be able to get back and
5604 s
->username
[0] = '\0';
5605 s
->got_username
= FALSE
;
5610 if (s
->got_username
&& !ssh
->cfg
.change_username
) {
5612 * We got a username last time round this loop, and
5613 * with change_username turned off we don't try to get
5616 } else if (!*ssh
->cfg
.username
) {
5617 if (ssh_get_line
&& !ssh_getline_pw_only
) {
5618 if (!ssh_get_line("login as: ",
5619 s
->username
, sizeof(s
->username
), FALSE
)) {
5621 * get_line failed to get a username.
5624 logevent("No username provided. Abandoning session.");
5625 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5629 int ret
; /* need not be saved across crReturn */
5630 c_write_str(ssh
, "login as: ");
5632 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
5634 crWaitUntilV(!pktin
);
5635 ret
= process_userpass_input(ssh
, in
, inlen
);
5639 c_write_str(ssh
, "\r\n");
5641 s
->username
[strcspn(s
->username
, "\n\r")] = '\0';
5644 strncpy(s
->username
, ssh
->cfg
.username
, sizeof(s
->username
));
5645 s
->username
[sizeof(s
->username
)-1] = '\0';
5646 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
5647 stuff
= dupprintf("Using username \"%s\".\r\n", s
->username
);
5648 c_write_str(ssh
, stuff
);
5652 s
->got_username
= TRUE
;
5655 * Send an authentication request using method "none": (a)
5656 * just in case it succeeds, and (b) so that we know what
5657 * authentication methods we can usefully try next.
5659 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
5661 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
5662 ssh2_pkt_addstring(s
->pktout
, s
->username
);
5663 ssh2_pkt_addstring(s
->pktout
, "ssh-connection");/* service requested */
5664 ssh2_pkt_addstring(s
->pktout
, "none"); /* method */
5665 ssh2_pkt_send(ssh
, s
->pktout
);
5666 s
->type
= AUTH_TYPE_NONE
;
5668 s
->we_are_in
= FALSE
;
5670 s
->tried_pubkey_config
= FALSE
;
5671 s
->tried_agent
= FALSE
;
5672 s
->tried_keyb_inter
= FALSE
;
5673 s
->kbd_inter_running
= FALSE
;
5674 /* Load the pub half of ssh->cfg.keyfile so we notice if it's in Pageant */
5675 if (!filename_is_null(ssh
->cfg
.keyfile
)) {
5677 logeventf(ssh
, "Reading private key file \"%.150s\"",
5678 filename_to_str(&ssh
->cfg
.keyfile
));
5679 keytype
= key_type(&ssh
->cfg
.keyfile
);
5680 if (keytype
== SSH_KEYTYPE_SSH2
) {
5682 ssh2_userkey_loadpub(&ssh
->cfg
.keyfile
, NULL
,
5683 &s
->publickey_bloblen
, NULL
);
5686 logeventf(ssh
, "Unable to use this key file (%s)",
5687 key_type_to_str(keytype
));
5688 msgbuf
= dupprintf("Unable to use key file \"%.150s\""
5690 filename_to_str(&ssh
->cfg
.keyfile
),
5691 key_type_to_str(keytype
));
5692 c_write_str(ssh
, msgbuf
);
5694 s
->publickey_blob
= NULL
;
5697 s
->publickey_blob
= NULL
;
5701 * Wait for the result of the last authentication request.
5704 crWaitUntilV(pktin
);
5705 while (pktin
->type
== SSH2_MSG_USERAUTH_BANNER
) {
5709 * Don't show the banner if we're operating in
5710 * non-verbose non-interactive mode. (It's probably
5711 * a script, which means nobody will read the
5712 * banner _anyway_, and moreover the printing of
5713 * the banner will screw up processing on the
5714 * output of (say) plink.)
5716 if (flags
& (FLAG_VERBOSE
| FLAG_INTERACTIVE
)) {
5717 ssh_pkt_getstring(pktin
, &banner
, &size
);
5719 c_write_untrusted(ssh
, banner
, size
);
5721 crWaitUntilV(pktin
);
5723 if (pktin
->type
== SSH2_MSG_USERAUTH_SUCCESS
) {
5724 logevent("Access granted");
5725 s
->we_are_in
= TRUE
;
5729 if (s
->kbd_inter_running
&&
5730 pktin
->type
== SSH2_MSG_USERAUTH_INFO_REQUEST
) {
5732 * This is either a further set-of-prompts packet
5733 * in keyboard-interactive authentication, or it's
5734 * the same one and we came back here with `gotit'
5735 * set. In the former case, we must reset the
5736 * curr_prompt variable.
5740 } else if (pktin
->type
!= SSH2_MSG_USERAUTH_FAILURE
) {
5741 bombout(("Strange packet received during authentication: type %d",
5749 * OK, we're now sitting on a USERAUTH_FAILURE message, so
5750 * we can look at the string in it and know what we can
5751 * helpfully try next.
5753 if (pktin
->type
== SSH2_MSG_USERAUTH_FAILURE
) {
5756 ssh_pkt_getstring(pktin
, &methods
, &methlen
);
5757 s
->kbd_inter_running
= FALSE
;
5758 if (!ssh2_pkt_getbool(pktin
)) {
5760 * We have received an unequivocal Access
5761 * Denied. This can translate to a variety of
5764 * - if we'd just tried "none" authentication,
5765 * it's not worth printing anything at all
5767 * - if we'd just tried a public key _offer_,
5768 * the message should be "Server refused our
5769 * key" (or no message at all if the key
5770 * came from Pageant)
5772 * - if we'd just tried anything else, the
5773 * message really should be "Access denied".
5775 * Additionally, if we'd just tried password
5776 * authentication, we should break out of this
5777 * whole loop so as to go back to the username
5778 * prompt (iff we're configured to allow
5779 * username change attempts).
5781 if (s
->type
== AUTH_TYPE_NONE
) {
5783 } else if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
||
5784 s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_QUIET
) {
5785 if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
)
5786 c_write_str(ssh
, "Server refused our key\r\n");
5787 logevent("Server refused public key");
5788 } else if (s
->type
==AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
) {
5789 /* server declined keyboard-interactive; ignore */
5791 c_write_str(ssh
, "Access denied\r\n");
5792 logevent("Access denied");
5793 if (s
->type
== AUTH_TYPE_PASSWORD
&&
5794 ssh
->cfg
.change_username
) {
5795 /* XXX perhaps we should allow
5796 * keyboard-interactive to do this too? */
5797 s
->we_are_in
= FALSE
;
5802 c_write_str(ssh
, "Further authentication required\r\n");
5803 logevent("Further authentication required");
5807 in_commasep_string("publickey", methods
, methlen
);
5809 in_commasep_string("password", methods
, methlen
);
5810 s
->can_keyb_inter
= ssh
->cfg
.try_ki_auth
&&
5811 in_commasep_string("keyboard-interactive", methods
, methlen
);
5815 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
5819 * Most password/passphrase prompts will be
5820 * non-echoing, so we set this to 0 by default.
5821 * Exception is that some keyboard-interactive prompts
5822 * can be echoing, in which case we'll set this to 1.
5826 if (!s
->method
&& s
->can_pubkey
&&
5827 agent_exists() && !s
->tried_agent
) {
5829 * Attempt public-key authentication using Pageant.
5834 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
5835 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
5837 s
->tried_agent
= TRUE
;
5839 logevent("Pageant is running. Requesting keys.");
5841 /* Request the keys held by the agent. */
5842 PUT_32BIT(s
->request
, 1);
5843 s
->request
[4] = SSH2_AGENTC_REQUEST_IDENTITIES
;
5844 if (!agent_query(s
->request
, 5, &r
, &s
->responselen
,
5845 ssh_agent_callback
, ssh
)) {
5849 bombout(("Unexpected data from server while"
5850 " waiting for agent response"));
5853 } while (pktin
|| inlen
> 0);
5854 r
= ssh
->agent_response
;
5855 s
->responselen
= ssh
->agent_response_len
;
5857 s
->response
= (unsigned char *) r
;
5858 if (s
->response
&& s
->responselen
>= 5 &&
5859 s
->response
[4] == SSH2_AGENT_IDENTITIES_ANSWER
) {
5860 s
->p
= s
->response
+ 5;
5861 s
->nkeys
= GET_32BIT(s
->p
);
5865 sprintf(buf
, "Pageant has %d SSH2 keys", s
->nkeys
);
5868 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
5873 sprintf(buf
, "Trying Pageant key #%d", s
->keyi
);
5876 s
->pklen
= GET_32BIT(s
->p
);
5878 if (s
->publickey_blob
&&
5879 s
->pklen
== s
->publickey_bloblen
&&
5880 !memcmp(s
->p
, s
->publickey_blob
,
5881 s
->publickey_bloblen
)) {
5882 logevent("This key matches configured key file");
5883 s
->tried_pubkey_config
= 1;
5885 s
->pkblob
= (char *)s
->p
;
5887 s
->alglen
= GET_32BIT(s
->pkblob
);
5888 s
->alg
= s
->pkblob
+ 4;
5889 s
->commentlen
= GET_32BIT(s
->p
);
5891 s
->commentp
= (char *)s
->p
;
5892 s
->p
+= s
->commentlen
;
5893 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
5894 ssh2_pkt_addstring(s
->pktout
, s
->username
);
5895 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
5896 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
5897 ssh2_pkt_addbool(s
->pktout
, FALSE
); /* no signature included */
5898 ssh2_pkt_addstring_start(s
->pktout
);
5899 ssh2_pkt_addstring_data(s
->pktout
, s
->alg
, s
->alglen
);
5900 ssh2_pkt_addstring_start(s
->pktout
);
5901 ssh2_pkt_addstring_data(s
->pktout
, s
->pkblob
, s
->pklen
);
5902 ssh2_pkt_send(ssh
, s
->pktout
);
5904 crWaitUntilV(pktin
);
5905 if (pktin
->type
!= SSH2_MSG_USERAUTH_PK_OK
) {
5906 logevent("Key refused");
5910 if (flags
& FLAG_VERBOSE
) {
5911 c_write_str(ssh
, "Authenticating with "
5913 c_write(ssh
, s
->commentp
, s
->commentlen
);
5914 c_write_str(ssh
, "\" from agent\r\n");
5918 * Server is willing to accept the key.
5919 * Construct a SIGN_REQUEST.
5921 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
5922 ssh2_pkt_addstring(s
->pktout
, s
->username
);
5923 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
5924 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
5925 ssh2_pkt_addbool(s
->pktout
, TRUE
);
5926 ssh2_pkt_addstring_start(s
->pktout
);
5927 ssh2_pkt_addstring_data(s
->pktout
, s
->alg
, s
->alglen
);
5928 ssh2_pkt_addstring_start(s
->pktout
);
5929 ssh2_pkt_addstring_data(s
->pktout
, s
->pkblob
, s
->pklen
);
5931 s
->siglen
= s
->pktout
->length
- 5 + 4 + 20;
5932 if (ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)
5934 s
->len
= 1; /* message type */
5935 s
->len
+= 4 + s
->pklen
; /* key blob */
5936 s
->len
+= 4 + s
->siglen
; /* data to sign */
5937 s
->len
+= 4; /* flags */
5938 s
->agentreq
= snewn(4 + s
->len
, char);
5939 PUT_32BIT(s
->agentreq
, s
->len
);
5940 s
->q
= s
->agentreq
+ 4;
5941 *s
->q
++ = SSH2_AGENTC_SIGN_REQUEST
;
5942 PUT_32BIT(s
->q
, s
->pklen
);
5944 memcpy(s
->q
, s
->pkblob
, s
->pklen
);
5946 PUT_32BIT(s
->q
, s
->siglen
);
5948 /* Now the data to be signed... */
5949 if (!(ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)) {
5950 PUT_32BIT(s
->q
, 20);
5953 memcpy(s
->q
, ssh
->v2_session_id
, 20);
5955 memcpy(s
->q
, s
->pktout
->data
+ 5,
5956 s
->pktout
->length
- 5);
5957 s
->q
+= s
->pktout
->length
- 5;
5958 /* And finally the (zero) flags word. */
5960 if (!agent_query(s
->agentreq
, s
->len
+ 4,
5962 ssh_agent_callback
, ssh
)) {
5966 bombout(("Unexpected data from server"
5967 " while waiting for agent"
5971 } while (pktin
|| inlen
> 0);
5972 vret
= ssh
->agent_response
;
5973 s
->retlen
= ssh
->agent_response_len
;
5978 if (s
->ret
[4] == SSH2_AGENT_SIGN_RESPONSE
) {
5979 logevent("Sending Pageant's response");
5980 ssh2_add_sigblob(ssh
, s
->pktout
,
5981 s
->pkblob
, s
->pklen
,
5983 GET_32BIT(s
->ret
+ 5));
5984 ssh2_pkt_send(ssh
, s
->pktout
);
5989 ("Pageant failed to answer challenge");
6000 if (!s
->method
&& s
->can_pubkey
&& s
->publickey_blob
6001 && !s
->tried_pubkey_config
) {
6002 unsigned char *pub_blob
;
6003 char *algorithm
, *comment
;
6006 s
->tried_pubkey_config
= TRUE
;
6008 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6009 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
6012 * Try the public key supplied in the configuration.
6014 * First, offer the public blob to see if the server is
6015 * willing to accept it.
6018 (unsigned char *)ssh2_userkey_loadpub(&ssh
->cfg
.keyfile
,
6023 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6024 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6025 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6026 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6027 ssh2_pkt_addbool(s
->pktout
, FALSE
); /* no signature included */
6028 ssh2_pkt_addstring(s
->pktout
, algorithm
);
6029 ssh2_pkt_addstring_start(s
->pktout
);
6030 ssh2_pkt_addstring_data(s
->pktout
, (char *)pub_blob
,
6032 ssh2_pkt_send(ssh
, s
->pktout
);
6033 logevent("Offered public key");
6035 crWaitUntilV(pktin
);
6036 if (pktin
->type
!= SSH2_MSG_USERAUTH_PK_OK
) {
6038 s
->type
= AUTH_TYPE_PUBLICKEY_OFFER_LOUD
;
6039 continue; /* key refused; give up on it */
6042 logevent("Offer of public key accepted");
6044 * Actually attempt a serious authentication using
6047 if (ssh2_userkey_encrypted(&ssh
->cfg
.keyfile
, &comment
)) {
6048 sprintf(s
->pwprompt
,
6049 "Passphrase for key \"%.100s\": ",
6055 if (flags
& FLAG_VERBOSE
) {
6056 c_write_str(ssh
, "Authenticating with public key \"");
6057 c_write_str(ssh
, comment
);
6058 c_write_str(ssh
, "\"\r\n");
6060 s
->method
= AUTH_PUBLICKEY_FILE
;
6064 if (!s
->method
&& s
->can_keyb_inter
&& !s
->tried_keyb_inter
) {
6065 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
6066 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
6067 s
->tried_keyb_inter
= TRUE
;
6069 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6070 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
6072 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6073 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6074 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6075 ssh2_pkt_addstring(s
->pktout
, "keyboard-interactive"); /* method */
6076 ssh2_pkt_addstring(s
->pktout
, ""); /* lang */
6077 ssh2_pkt_addstring(s
->pktout
, "");
6078 ssh2_pkt_send(ssh
, s
->pktout
);
6080 crWaitUntilV(pktin
);
6081 if (pktin
->type
!= SSH2_MSG_USERAUTH_INFO_REQUEST
) {
6082 if (pktin
->type
== SSH2_MSG_USERAUTH_FAILURE
)
6084 logevent("Keyboard-interactive authentication refused");
6085 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
;
6089 s
->kbd_inter_running
= TRUE
;
6093 if (s
->kbd_inter_running
) {
6094 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
6095 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
6096 s
->tried_keyb_inter
= TRUE
;
6098 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6099 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
6101 if (s
->curr_prompt
== 0) {
6103 * We've got a fresh USERAUTH_INFO_REQUEST.
6104 * Display header data, and start going through
6107 char *name
, *inst
, *lang
;
6108 int name_len
, inst_len
, lang_len
;
6110 ssh_pkt_getstring(pktin
, &name
, &name_len
);
6111 ssh_pkt_getstring(pktin
, &inst
, &inst_len
);
6112 ssh_pkt_getstring(pktin
, &lang
, &lang_len
);
6114 c_write_untrusted(ssh
, name
, name_len
);
6115 c_write_str(ssh
, "\r\n");
6118 c_write_untrusted(ssh
, inst
, inst_len
);
6119 c_write_str(ssh
, "\r\n");
6121 s
->num_prompts
= ssh_pkt_getuint32(pktin
);
6125 * If there are prompts remaining in the packet,
6126 * display one and get a response.
6128 if (s
->curr_prompt
< s
->num_prompts
) {
6132 ssh_pkt_getstring(pktin
, &prompt
, &prompt_len
);
6133 if (prompt_len
> 0) {
6134 static const char trunc
[] = "<prompt truncated>: ";
6135 static const int prlen
= sizeof(s
->pwprompt
) -
6137 if (prompt_len
> prlen
) {
6138 memcpy(s
->pwprompt
, prompt
, prlen
);
6139 strcpy(s
->pwprompt
+ prlen
, trunc
);
6141 memcpy(s
->pwprompt
, prompt
, prompt_len
);
6142 s
->pwprompt
[prompt_len
] = '\0';
6146 "<server failed to send prompt>: ");
6148 s
->echo
= ssh2_pkt_getbool(pktin
);
6154 if (!s
->method
&& s
->can_passwd
) {
6155 s
->method
= AUTH_PASSWORD
;
6156 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6157 ssh
->pkt_ctx
|= SSH2_PKTCTX_PASSWORD
;
6158 sprintf(s
->pwprompt
, "%.90s@%.90s's password: ", s
->username
,
6165 if (!ssh_get_line(s
->pwprompt
, s
->password
,
6166 sizeof(s
->password
), TRUE
)) {
6168 * get_line failed to get a password (for
6169 * example because one was supplied on the
6170 * command line which has already failed to
6173 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
6174 ssh2_pkt_adduint32(s
->pktout
,SSH2_DISCONNECT_BY_APPLICATION
);
6175 ssh2_pkt_addstring(s
->pktout
, "No more passwords available"
6177 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
6178 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
6179 logevent("Unable to authenticate");
6180 connection_fatal(ssh
->frontend
,
6181 "Unable to authenticate");
6182 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6186 int ret
; /* need not be saved across crReturn */
6187 c_write_untrusted(ssh
, s
->pwprompt
, strlen(s
->pwprompt
));
6190 setup_userpass_input(ssh
, s
->password
,
6191 sizeof(s
->password
), s
->echo
);
6193 crWaitUntilV(!pktin
);
6194 ret
= process_userpass_input(ssh
, in
, inlen
);
6198 c_write_str(ssh
, "\r\n");
6202 if (s
->method
== AUTH_PUBLICKEY_FILE
) {
6204 * We have our passphrase. Now try the actual authentication.
6206 struct ssh2_userkey
*key
;
6207 const char *error
= NULL
;
6209 key
= ssh2_load_userkey(&ssh
->cfg
.keyfile
, s
->password
,
6211 if (key
== SSH2_WRONG_PASSPHRASE
|| key
== NULL
) {
6212 if (key
== SSH2_WRONG_PASSPHRASE
) {
6213 c_write_str(ssh
, "Wrong passphrase\r\n");
6214 s
->tried_pubkey_config
= FALSE
;
6216 c_write_str(ssh
, "Unable to load private key (");
6217 c_write_str(ssh
, error
);
6218 c_write_str(ssh
, ")\r\n");
6219 s
->tried_pubkey_config
= TRUE
;
6221 /* Send a spurious AUTH_NONE to return to the top. */
6222 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6223 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6224 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6225 ssh2_pkt_addstring(s
->pktout
, "none"); /* method */
6226 ssh2_pkt_send(ssh
, s
->pktout
);
6227 s
->type
= AUTH_TYPE_NONE
;
6229 unsigned char *pkblob
, *sigblob
, *sigdata
;
6230 int pkblob_len
, sigblob_len
, sigdata_len
;
6234 * We have loaded the private key and the server
6235 * has announced that it's willing to accept it.
6236 * Hallelujah. Generate a signature and send it.
6238 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6239 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6240 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6241 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6242 ssh2_pkt_addbool(s
->pktout
, TRUE
);
6243 ssh2_pkt_addstring(s
->pktout
, key
->alg
->name
);
6244 pkblob
= key
->alg
->public_blob(key
->data
, &pkblob_len
);
6245 ssh2_pkt_addstring_start(s
->pktout
);
6246 ssh2_pkt_addstring_data(s
->pktout
, (char *)pkblob
, pkblob_len
);
6249 * The data to be signed is:
6253 * followed by everything so far placed in the
6256 sigdata_len
= s
->pktout
->length
- 5 + 4 + 20;
6257 if (ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)
6259 sigdata
= snewn(sigdata_len
, unsigned char);
6261 if (!(ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)) {
6262 PUT_32BIT(sigdata
+p
, 20);
6265 memcpy(sigdata
+p
, ssh
->v2_session_id
, 20); p
+= 20;
6266 memcpy(sigdata
+p
, s
->pktout
->data
+ 5,
6267 s
->pktout
->length
- 5);
6268 p
+= s
->pktout
->length
- 5;
6269 assert(p
== sigdata_len
);
6270 sigblob
= key
->alg
->sign(key
->data
, (char *)sigdata
,
6271 sigdata_len
, &sigblob_len
);
6272 ssh2_add_sigblob(ssh
, s
->pktout
, pkblob
, pkblob_len
,
6273 sigblob
, sigblob_len
);
6278 ssh2_pkt_send(ssh
, s
->pktout
);
6279 s
->type
= AUTH_TYPE_PUBLICKEY
;
6280 key
->alg
->freekey(key
->data
);
6282 } else if (s
->method
== AUTH_PASSWORD
) {
6284 * We send the password packet lumped tightly together with
6285 * an SSH_MSG_IGNORE packet. The IGNORE packet contains a
6286 * string long enough to make the total length of the two
6287 * packets constant. This should ensure that a passive
6288 * listener doing traffic analyis can't work out the length
6291 * For this to work, we need an assumption about the
6292 * maximum length of the password packet. I think 256 is
6293 * pretty conservative. Anyone using a password longer than
6294 * that probably doesn't have much to worry about from
6295 * people who find out how long their password is!
6297 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6298 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6299 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6300 ssh2_pkt_addstring(s
->pktout
, "password");
6301 ssh2_pkt_addbool(s
->pktout
, FALSE
);
6302 dont_log_password(ssh
, s
->pktout
, PKTLOG_BLANK
);
6303 ssh2_pkt_addstring(s
->pktout
, s
->password
);
6304 memset(s
->password
, 0, sizeof(s
->password
));
6305 end_log_omission(ssh
, s
->pktout
);
6306 ssh2_pkt_defer(ssh
, s
->pktout
);
6308 * We'll include a string that's an exact multiple of the
6309 * cipher block size. If the cipher is NULL for some
6310 * reason, we don't do this trick at all because we gain
6313 if (ssh
->cscipher
) {
6316 stringlen
= (256 - ssh
->deferred_len
);
6317 stringlen
+= ssh
->cscipher
->blksize
- 1;
6318 stringlen
-= (stringlen
% ssh
->cscipher
->blksize
);
6321 * Temporarily disable actual compression,
6322 * so we can guarantee to get this string
6323 * exactly the length we want it. The
6324 * compression-disabling routine should
6325 * return an integer indicating how many
6326 * bytes we should adjust our string length
6330 ssh
->cscomp
->disable_compression(ssh
->cs_comp_ctx
);
6332 s
->pktout
= ssh2_pkt_init(SSH2_MSG_IGNORE
);
6333 ssh2_pkt_addstring_start(s
->pktout
);
6334 for (i
= 0; i
< stringlen
; i
++) {
6335 char c
= (char) random_byte();
6336 ssh2_pkt_addstring_data(s
->pktout
, &c
, 1);
6338 ssh2_pkt_defer(ssh
, s
->pktout
);
6340 ssh_pkt_defersend(ssh
);
6341 logevent("Sent password");
6342 s
->type
= AUTH_TYPE_PASSWORD
;
6343 } else if (s
->method
== AUTH_KEYBOARD_INTERACTIVE
) {
6344 if (s
->curr_prompt
== 0) {
6345 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_INFO_RESPONSE
);
6346 ssh2_pkt_adduint32(s
->pktout
, s
->num_prompts
);
6348 if (s
->need_pw
) { /* only add pw if we just got one! */
6349 dont_log_password(ssh
, s
->pktout
, PKTLOG_BLANK
);
6350 ssh2_pkt_addstring(s
->pktout
, s
->password
);
6351 memset(s
->password
, 0, sizeof(s
->password
));
6352 end_log_omission(ssh
, s
->pktout
);
6355 if (s
->curr_prompt
>= s
->num_prompts
) {
6356 ssh2_pkt_send(ssh
, s
->pktout
);
6359 * If there are prompts remaining, we set
6360 * `gotit' so that we won't attempt to get
6361 * another packet. Then we go back round the
6362 * loop and will end up retrieving another
6363 * prompt out of the existing packet. Funky or
6368 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
6370 c_write_str(ssh
, "No supported authentication methods"
6371 " left to try!\r\n");
6372 logevent("No supported authentications offered."
6374 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
6375 ssh2_pkt_adduint32(s
->pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
6376 ssh2_pkt_addstring(s
->pktout
, "No supported authentication"
6377 " methods available");
6378 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
6379 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
6380 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6384 } while (!s
->we_are_in
);
6387 * Now we're authenticated for the connection protocol. The
6388 * connection protocol will automatically have started at this
6389 * point; there's no need to send SERVICE_REQUEST.
6392 ssh
->channels
= newtree234(ssh_channelcmp
);
6395 * Set up handlers for some connection protocol messages, so we
6396 * don't have to handle them repeatedly in this coroutine.
6398 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_WINDOW_ADJUST
] =
6399 ssh2_msg_channel_window_adjust
;
6400 ssh
->packet_dispatch
[SSH2_MSG_GLOBAL_REQUEST
] =
6401 ssh2_msg_global_request
;
6404 * Create the main session channel.
6406 if (!ssh
->cfg
.ssh_no_shell
) {
6407 ssh
->mainchan
= snew(struct ssh_channel
);
6408 ssh
->mainchan
->ssh
= ssh
;
6409 ssh
->mainchan
->localid
= alloc_channel_id(ssh
);
6410 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
6411 ssh2_pkt_addstring(s
->pktout
, "session");
6412 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->localid
);
6413 ssh
->mainchan
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
6414 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->v
.v2
.locwindow
);/* our window size */
6415 ssh2_pkt_adduint32(s
->pktout
, 0x4000UL
); /* our max pkt size */
6416 ssh2_pkt_send(ssh
, s
->pktout
);
6417 crWaitUntilV(pktin
);
6418 if (pktin
->type
!= SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
6419 bombout(("Server refused to open a session"));
6421 /* FIXME: error data comes back in FAILURE packet */
6423 if (ssh_pkt_getuint32(pktin
) != ssh
->mainchan
->localid
) {
6424 bombout(("Server's channel confirmation cited wrong channel"));
6427 ssh
->mainchan
->remoteid
= ssh_pkt_getuint32(pktin
);
6428 ssh
->mainchan
->type
= CHAN_MAINSESSION
;
6429 ssh
->mainchan
->closes
= 0;
6430 ssh
->mainchan
->v
.v2
.remwindow
= ssh_pkt_getuint32(pktin
);
6431 ssh
->mainchan
->v
.v2
.remmaxpkt
= ssh_pkt_getuint32(pktin
);
6432 bufchain_init(&ssh
->mainchan
->v
.v2
.outbuffer
);
6433 add234(ssh
->channels
, ssh
->mainchan
);
6434 update_specials_menu(ssh
->frontend
);
6435 logevent("Opened channel for session");
6437 ssh
->mainchan
= NULL
;
6440 * Now we have a channel, make dispatch table entries for
6441 * general channel-based messages.
6443 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_DATA
] =
6444 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EXTENDED_DATA
] =
6445 ssh2_msg_channel_data
;
6446 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EOF
] = ssh2_msg_channel_eof
;
6447 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_CLOSE
] = ssh2_msg_channel_close
;
6448 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
] =
6449 ssh2_msg_channel_open_confirmation
;
6450 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_FAILURE
] =
6451 ssh2_msg_channel_open_failure
;
6452 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_REQUEST
] =
6453 ssh2_msg_channel_request
;
6454 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN
] =
6455 ssh2_msg_channel_open
;
6458 * Potentially enable X11 forwarding.
6460 if (ssh
->mainchan
&& ssh
->cfg
.x11_forward
) {
6461 char proto
[20], data
[64];
6462 logevent("Requesting X11 forwarding");
6463 ssh
->x11auth
= x11_invent_auth(proto
, sizeof(proto
),
6464 data
, sizeof(data
), ssh
->cfg
.x11_auth
);
6465 x11_get_real_auth(ssh
->x11auth
, ssh
->cfg
.x11_display
);
6466 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
6467 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
6468 ssh2_pkt_addstring(s
->pktout
, "x11-req");
6469 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6470 ssh2_pkt_addbool(s
->pktout
, 0); /* many connections */
6471 ssh2_pkt_addstring(s
->pktout
, proto
);
6472 ssh2_pkt_addstring(s
->pktout
, data
);
6473 ssh2_pkt_adduint32(s
->pktout
, x11_get_screen_number(ssh
->cfg
.x11_display
));
6474 ssh2_pkt_send(ssh
, s
->pktout
);
6476 crWaitUntilV(pktin
);
6478 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
6479 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
6480 bombout(("Unexpected response to X11 forwarding request:"
6481 " packet type %d", pktin
->type
));
6484 logevent("X11 forwarding refused");
6486 logevent("X11 forwarding enabled");
6487 ssh
->X11_fwd_enabled
= TRUE
;
6492 * Enable port forwardings.
6497 int sport
,dport
,sserv
,dserv
;
6498 char sports
[256], dports
[256], saddr
[256], host
[256];
6500 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh2
);
6501 /* Add port forwardings. */
6502 ssh
->portfwd_strptr
= ssh
->cfg
.portfwd
;
6503 while (*ssh
->portfwd_strptr
) {
6504 type
= *ssh
->portfwd_strptr
++;
6507 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= '\t') {
6508 if (*ssh
->portfwd_strptr
== ':') {
6510 * We've seen a colon in the middle of the
6511 * source port number. This means that
6512 * everything we've seen until now is the
6513 * source _address_, so we'll move it into
6514 * saddr and start sports from the beginning
6517 ssh
->portfwd_strptr
++;
6519 strcpy(saddr
, sports
);
6522 if (n
< 255) sports
[n
++] = *ssh
->portfwd_strptr
++;
6526 if (*ssh
->portfwd_strptr
== '\t')
6527 ssh
->portfwd_strptr
++;
6529 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= ':') {
6530 if (n
< 255) host
[n
++] = *ssh
->portfwd_strptr
++;
6533 if (*ssh
->portfwd_strptr
== ':')
6534 ssh
->portfwd_strptr
++;
6536 while (*ssh
->portfwd_strptr
) {
6537 if (n
< 255) dports
[n
++] = *ssh
->portfwd_strptr
++;
6540 ssh
->portfwd_strptr
++;
6541 dport
= atoi(dports
);
6545 dport
= net_service_lookup(dports
);
6547 logeventf(ssh
, "Service lookup failed for destination"
6548 " port \"%s\"", dports
);
6552 while (*ssh
->portfwd_strptr
) ssh
->portfwd_strptr
++;
6554 ssh
->portfwd_strptr
++; /* eat the NUL and move to next one */
6556 sport
= atoi(sports
);
6560 sport
= net_service_lookup(sports
);
6562 logeventf(ssh
, "Service lookup failed for source"
6563 " port \"%s\"", sports
);
6566 if (sport
&& dport
) {
6567 /* Set up a description of the source port. */
6568 static char *sportdesc
;
6569 sportdesc
= dupprintf("%.*s%.*s%.*s%.*s%d%.*s",
6570 (int)(*saddr?
strlen(saddr
):0), *saddr?saddr
:NULL
,
6571 (int)(*saddr?
1:0), ":",
6572 (int)(sserv ?
strlen(sports
) : 0), sports
,
6573 sserv
, "(", sport
, sserv
, ")");
6575 /* Verbose description of the destination port */
6576 char *dportdesc
= dupprintf("%s:%.*s%.*s%d%.*s",
6578 (int)(dserv ?
strlen(dports
) : 0), dports
,
6579 dserv
, "(", dport
, dserv
, ")");
6580 const char *err
= pfd_addforward(host
, dport
,
6581 *saddr ? saddr
: NULL
,
6582 sport
, ssh
, &ssh
->cfg
);
6584 logeventf(ssh
, "Local port %s forward to %s"
6585 " failed: %s", sportdesc
, dportdesc
, err
);
6587 logeventf(ssh
, "Local port %s forwarding to %s",
6588 sportdesc
, dportdesc
);
6591 } else if (type
== 'D') {
6592 const char *err
= pfd_addforward(NULL
, -1,
6593 *saddr ? saddr
: NULL
,
6594 sport
, ssh
, &ssh
->cfg
);
6596 logeventf(ssh
, "Local port %s SOCKS dynamic forward"
6597 " setup failed: %s", sportdesc
, err
);
6599 logeventf(ssh
, "Local port %s doing SOCKS"
6600 " dynamic forwarding", sportdesc
);
6603 struct ssh_rportfwd
*pf
;
6604 pf
= snew(struct ssh_rportfwd
);
6605 strcpy(pf
->dhost
, host
);
6608 if (add234(ssh
->rportfwds
, pf
) != pf
) {
6609 logeventf(ssh
, "Duplicate remote port forwarding"
6610 " to %s:%d", host
, dport
);
6613 logeventf(ssh
, "Requesting remote port %s"
6614 " forward to %s:%.*s%.*s%d%.*s",
6617 (int)(dserv ?
strlen(dports
) : 0), dports
,
6618 dserv
, "(", dport
, dserv
, ")");
6619 s
->pktout
= ssh2_pkt_init(SSH2_MSG_GLOBAL_REQUEST
);
6620 ssh2_pkt_addstring(s
->pktout
, "tcpip-forward");
6621 ssh2_pkt_addbool(s
->pktout
, 1);/* want reply */
6623 ssh2_pkt_addstring(s
->pktout
, saddr
);
6624 } else if (ssh
->cfg
.rport_acceptall
) {
6625 ssh2_pkt_addstring(s
->pktout
, "0.0.0.0");
6627 ssh2_pkt_addstring(s
->pktout
, "127.0.0.1");
6629 ssh2_pkt_adduint32(s
->pktout
, sport
);
6630 ssh2_pkt_send(ssh
, s
->pktout
);
6632 crWaitUntilV(pktin
);
6634 if (pktin
->type
!= SSH2_MSG_REQUEST_SUCCESS
) {
6635 if (pktin
->type
!= SSH2_MSG_REQUEST_FAILURE
) {
6636 bombout(("Unexpected response to port "
6637 "forwarding request: packet type %d",
6641 logevent("Server refused this port forwarding");
6643 logevent("Remote port forwarding enabled");
6653 * Potentially enable agent forwarding.
6655 if (ssh
->mainchan
&& ssh
->cfg
.agentfwd
&& agent_exists()) {
6656 logevent("Requesting OpenSSH-style agent forwarding");
6657 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
6658 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
6659 ssh2_pkt_addstring(s
->pktout
, "auth-agent-req@openssh.com");
6660 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6661 ssh2_pkt_send(ssh
, s
->pktout
);
6663 crWaitUntilV(pktin
);
6665 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
6666 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
6667 bombout(("Unexpected response to agent forwarding request:"
6668 " packet type %d", pktin
->type
));
6671 logevent("Agent forwarding refused");
6673 logevent("Agent forwarding enabled");
6674 ssh
->agentfwd_enabled
= TRUE
;
6679 * Now allocate a pty for the session.
6681 if (ssh
->mainchan
&& !ssh
->cfg
.nopty
) {
6682 /* Unpick the terminal-speed string. */
6683 /* XXX perhaps we should allow no speeds to be sent. */
6684 ssh
->ospeed
= 38400; ssh
->ispeed
= 38400; /* last-resort defaults */
6685 sscanf(ssh
->cfg
.termspeed
, "%d,%d", &ssh
->ospeed
, &ssh
->ispeed
);
6686 /* Build the pty request. */
6687 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
6688 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
); /* recipient channel */
6689 ssh2_pkt_addstring(s
->pktout
, "pty-req");
6690 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6691 ssh2_pkt_addstring(s
->pktout
, ssh
->cfg
.termtype
);
6692 ssh2_pkt_adduint32(s
->pktout
, ssh
->term_width
);
6693 ssh2_pkt_adduint32(s
->pktout
, ssh
->term_height
);
6694 ssh2_pkt_adduint32(s
->pktout
, 0); /* pixel width */
6695 ssh2_pkt_adduint32(s
->pktout
, 0); /* pixel height */
6696 ssh2_pkt_addstring_start(s
->pktout
);
6697 ssh2_pkt_addbyte(s
->pktout
, 128); /* TTY_OP_ISPEED */
6698 ssh2_pkt_adduint32(s
->pktout
, ssh
->ispeed
);
6699 ssh2_pkt_addbyte(s
->pktout
, 129); /* TTY_OP_OSPEED */
6700 ssh2_pkt_adduint32(s
->pktout
, ssh
->ospeed
);
6701 ssh2_pkt_addstring_data(s
->pktout
, "\0", 1); /* TTY_OP_END */
6702 ssh2_pkt_send(ssh
, s
->pktout
);
6703 ssh
->state
= SSH_STATE_INTERMED
;
6705 crWaitUntilV(pktin
);
6707 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
6708 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
6709 bombout(("Unexpected response to pty request:"
6710 " packet type %d", pktin
->type
));
6713 c_write_str(ssh
, "Server refused to allocate pty\r\n");
6714 ssh
->editing
= ssh
->echoing
= 1;
6716 logeventf(ssh
, "Allocated pty (ospeed %dbps, ispeed %dbps)",
6717 ssh
->ospeed
, ssh
->ispeed
);
6720 ssh
->editing
= ssh
->echoing
= 1;
6724 * Send environment variables.
6726 * Simplest thing here is to send all the requests at once, and
6727 * then wait for a whole bunch of successes or failures.
6729 if (ssh
->mainchan
&& *ssh
->cfg
.environmt
) {
6730 char *e
= ssh
->cfg
.environmt
;
6731 char *var
, *varend
, *val
;
6737 while (*e
&& *e
!= '\t') e
++;
6739 if (*e
== '\t') e
++;
6744 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
6745 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
6746 ssh2_pkt_addstring(s
->pktout
, "env");
6747 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6748 ssh2_pkt_addstring_start(s
->pktout
);
6749 ssh2_pkt_addstring_data(s
->pktout
, var
, varend
-var
);
6750 ssh2_pkt_addstring(s
->pktout
, val
);
6751 ssh2_pkt_send(ssh
, s
->pktout
);
6756 logeventf(ssh
, "Sent %d environment variables", s
->num_env
);
6759 s
->env_left
= s
->num_env
;
6761 while (s
->env_left
> 0) {
6762 crWaitUntilV(pktin
);
6764 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
6765 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
6766 bombout(("Unexpected response to environment request:"
6767 " packet type %d", pktin
->type
));
6777 if (s
->env_ok
== s
->num_env
) {
6778 logevent("All environment variables successfully set");
6779 } else if (s
->env_ok
== 0) {
6780 logevent("All environment variables refused");
6781 c_write_str(ssh
, "Server refused to set environment variables\r\n");
6783 logeventf(ssh
, "%d environment variables refused",
6784 s
->num_env
- s
->env_ok
);
6785 c_write_str(ssh
, "Server refused to set all environment variables\r\n");
6790 * Start a shell or a remote command. We may have to attempt
6791 * this twice if the config data has provided a second choice
6794 if (ssh
->mainchan
) while (1) {
6798 if (ssh
->fallback_cmd
) {
6799 subsys
= ssh
->cfg
.ssh_subsys2
;
6800 cmd
= ssh
->cfg
.remote_cmd_ptr2
;
6802 subsys
= ssh
->cfg
.ssh_subsys
;
6803 cmd
= ssh
->cfg
.remote_cmd_ptr
;
6806 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
6807 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
); /* recipient channel */
6809 ssh2_pkt_addstring(s
->pktout
, "subsystem");
6810 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6811 ssh2_pkt_addstring(s
->pktout
, cmd
);
6813 ssh2_pkt_addstring(s
->pktout
, "exec");
6814 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6815 ssh2_pkt_addstring(s
->pktout
, cmd
);
6817 ssh2_pkt_addstring(s
->pktout
, "shell");
6818 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6820 ssh2_pkt_send(ssh
, s
->pktout
);
6822 crWaitUntilV(pktin
);
6824 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
6825 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
6826 bombout(("Unexpected response to shell/command request:"
6827 " packet type %d", pktin
->type
));
6831 * We failed to start the command. If this is the
6832 * fallback command, we really are finished; if it's
6833 * not, and if the fallback command exists, try falling
6834 * back to it before complaining.
6836 if (!ssh
->fallback_cmd
&& ssh
->cfg
.remote_cmd_ptr2
!= NULL
) {
6837 logevent("Primary command failed; attempting fallback");
6838 ssh
->fallback_cmd
= TRUE
;
6841 bombout(("Server refused to start a shell/command"));
6844 logevent("Started a shell/command");
6849 ssh
->state
= SSH_STATE_SESSION
;
6850 if (ssh
->size_needed
)
6851 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
6852 if (ssh
->eof_needed
)
6853 ssh_special(ssh
, TS_EOF
);
6859 ldisc_send(ssh
->ldisc
, NULL
, 0, 0);/* cause ldisc to notice changes */
6864 s
->try_send
= FALSE
;
6868 * _All_ the connection-layer packets we expect to
6869 * receive are now handled by the dispatch table.
6870 * Anything that reaches here must be bogus.
6873 bombout(("Strange packet received: type %d", pktin
->type
));
6875 } else if (ssh
->mainchan
) {
6877 * We have spare data. Add it to the channel buffer.
6879 ssh2_add_channel_data(ssh
->mainchan
, (char *)in
, inlen
);
6884 struct ssh_channel
*c
;
6886 * Try to send data on all channels if we can.
6888 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
6891 continue; /* don't send on closing channels */
6892 bufsize
= ssh2_try_send(c
);
6895 case CHAN_MAINSESSION
:
6896 /* stdin need not receive an unthrottle
6897 * notification since it will be polled */
6900 x11_unthrottle(c
->u
.x11
.s
);
6903 /* agent sockets are request/response and need no
6904 * buffer management */
6907 pfd_unthrottle(c
->u
.pfd
.s
);
6919 * Handlers for SSH2 messages that might arrive at any moment.
6921 void ssh2_msg_disconnect(Ssh ssh
, struct Packet
*pktin
)
6923 /* log reason code in disconnect message */
6925 int nowlen
, reason
, msglen
;
6927 reason
= ssh_pkt_getuint32(pktin
);
6928 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
6930 if (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) {
6931 buf
= dupprintf("Received disconnect message (%s)",
6932 ssh2_disconnect_reasons
[reason
]);
6934 buf
= dupprintf("Received disconnect message (unknown"
6935 " type %d)", reason
);
6939 buf
= dupprintf("Disconnection message text: %n%.*s",
6940 &nowlen
, msglen
, msg
);
6942 bombout(("Server sent disconnect message\ntype %d (%s):\n\"%s\"",
6944 (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) ?
6945 ssh2_disconnect_reasons
[reason
] : "unknown",
6950 void ssh2_msg_debug(Ssh ssh
, struct Packet
*pktin
)
6952 /* log the debug message */
6957 /* XXX maybe we should actually take notice of this */
6958 always_display
= ssh2_pkt_getbool(pktin
);
6959 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
6961 buf
= dupprintf("Remote debug message: %.*s", msglen
, msg
);
6966 void ssh2_msg_something_unimplemented(Ssh ssh
, struct Packet
*pktin
)
6968 struct Packet
*pktout
;
6969 pktout
= ssh2_pkt_init(SSH2_MSG_UNIMPLEMENTED
);
6970 ssh2_pkt_adduint32(pktout
, pktin
->sequence
);
6972 * UNIMPLEMENTED messages MUST appear in the same order as the
6973 * messages they respond to. Hence, never queue them.
6975 ssh2_pkt_send_noqueue(ssh
, pktout
);
6979 * Handle the top-level SSH2 protocol.
6981 static void ssh2_protocol_setup(Ssh ssh
)
6986 * Most messages cause SSH2_MSG_UNIMPLEMENTED.
6988 for (i
= 0; i
< 256; i
++)
6989 ssh
->packet_dispatch
[i
] = ssh2_msg_something_unimplemented
;
6992 * Any message we actually understand, we set to NULL so that
6993 * the coroutines will get it.
6995 ssh
->packet_dispatch
[SSH2_MSG_UNIMPLEMENTED
] = NULL
;
6996 ssh
->packet_dispatch
[SSH2_MSG_SERVICE_REQUEST
] = NULL
;
6997 ssh
->packet_dispatch
[SSH2_MSG_SERVICE_ACCEPT
] = NULL
;
6998 ssh
->packet_dispatch
[SSH2_MSG_KEXINIT
] = NULL
;
6999 ssh
->packet_dispatch
[SSH2_MSG_NEWKEYS
] = NULL
;
7000 ssh
->packet_dispatch
[SSH2_MSG_KEXDH_INIT
] = NULL
;
7001 ssh
->packet_dispatch
[SSH2_MSG_KEXDH_REPLY
] = NULL
;
7002 /* ssh->packet_dispatch[SSH2_MSG_KEX_DH_GEX_REQUEST] = NULL; duplicate case value */
7003 /* ssh->packet_dispatch[SSH2_MSG_KEX_DH_GEX_GROUP] = NULL; duplicate case value */
7004 ssh
->packet_dispatch
[SSH2_MSG_KEX_DH_GEX_INIT
] = NULL
;
7005 ssh
->packet_dispatch
[SSH2_MSG_KEX_DH_GEX_REPLY
] = NULL
;
7006 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_REQUEST
] = NULL
;
7007 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_FAILURE
] = NULL
;
7008 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_SUCCESS
] = NULL
;
7009 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_BANNER
] = NULL
;
7010 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_PK_OK
] = NULL
;
7011 /* ssh->packet_dispatch[SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ] = NULL; duplicate case value */
7012 /* ssh->packet_dispatch[SSH2_MSG_USERAUTH_INFO_REQUEST] = NULL; duplicate case value */
7013 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_INFO_RESPONSE
] = NULL
;
7014 ssh
->packet_dispatch
[SSH2_MSG_GLOBAL_REQUEST
] = NULL
;
7015 ssh
->packet_dispatch
[SSH2_MSG_REQUEST_SUCCESS
] = NULL
;
7016 ssh
->packet_dispatch
[SSH2_MSG_REQUEST_FAILURE
] = NULL
;
7017 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN
] = NULL
;
7018 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
] = NULL
;
7019 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_FAILURE
] = NULL
;
7020 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_WINDOW_ADJUST
] = NULL
;
7021 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_DATA
] = NULL
;
7022 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EXTENDED_DATA
] = NULL
;
7023 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EOF
] = NULL
;
7024 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_CLOSE
] = NULL
;
7025 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_REQUEST
] = NULL
;
7026 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_SUCCESS
] = NULL
;
7027 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_FAILURE
] = NULL
;
7030 * These special message types we install handlers for.
7032 ssh
->packet_dispatch
[SSH2_MSG_DISCONNECT
] = ssh2_msg_disconnect
;
7033 ssh
->packet_dispatch
[SSH2_MSG_IGNORE
] = ssh_msg_ignore
; /* shared with ssh1 */
7034 ssh
->packet_dispatch
[SSH2_MSG_DEBUG
] = ssh2_msg_debug
;
7037 static void ssh2_timer(void *ctx
, long now
)
7041 if (!ssh
->kex_in_progress
&&
7042 now
- ssh
->next_rekey
>= 0) {
7043 do_ssh2_transport(ssh
, "Initiating key re-exchange (timeout)",
7048 static void ssh2_protocol(Ssh ssh
, unsigned char *in
, int inlen
,
7049 struct Packet
*pktin
)
7051 if (ssh
->state
== SSH_STATE_CLOSED
)
7055 ssh
->incoming_data_size
+= pktin
->encrypted_len
;
7056 if (!ssh
->kex_in_progress
&&
7057 ssh
->incoming_data_size
> MAX_DATA_BEFORE_REKEY
)
7058 do_ssh2_transport(ssh
, "Initiating key re-exchange "
7059 "(too much data received)", -1, NULL
);
7062 if (pktin
&& ssh
->packet_dispatch
[pktin
->type
]) {
7063 ssh
->packet_dispatch
[pktin
->type
](ssh
, pktin
);
7067 if (!ssh
->protocol_initial_phase_done
||
7068 (pktin
&& pktin
->type
>= 20 && pktin
->type
< 50)) {
7069 if (do_ssh2_transport(ssh
, in
, inlen
, pktin
) &&
7070 !ssh
->protocol_initial_phase_done
) {
7071 ssh
->protocol_initial_phase_done
= TRUE
;
7073 * Allow authconn to initialise itself.
7075 do_ssh2_authconn(ssh
, NULL
, 0, NULL
);
7078 do_ssh2_authconn(ssh
, in
, inlen
, pktin
);
7083 * Called to set up the connection.
7085 * Returns an error message, or NULL on success.
7087 static const char *ssh_init(void *frontend_handle
, void **backend_handle
,
7089 char *host
, int port
, char **realhost
, int nodelay
,
7095 ssh
= snew(struct ssh_tag
);
7096 ssh
->cfg
= *cfg
; /* STRUCTURE COPY */
7097 ssh
->version
= 0; /* when not ready yet */
7100 ssh
->v1_cipher_ctx
= NULL
;
7101 ssh
->crcda_ctx
= NULL
;
7102 ssh
->cscipher
= NULL
;
7103 ssh
->cs_cipher_ctx
= NULL
;
7104 ssh
->sccipher
= NULL
;
7105 ssh
->sc_cipher_ctx
= NULL
;
7107 ssh
->cs_mac_ctx
= NULL
;
7109 ssh
->sc_mac_ctx
= NULL
;
7111 ssh
->cs_comp_ctx
= NULL
;
7113 ssh
->sc_comp_ctx
= NULL
;
7115 ssh
->kex_ctx
= NULL
;
7116 ssh
->hostkey
= NULL
;
7118 ssh
->state
= SSH_STATE_PREPACKET
;
7119 ssh
->size_needed
= FALSE
;
7120 ssh
->eof_needed
= FALSE
;
7123 ssh
->deferred_send_data
= NULL
;
7124 ssh
->deferred_len
= 0;
7125 ssh
->deferred_size
= 0;
7126 ssh
->fallback_cmd
= 0;
7128 ssh
->x11auth
= NULL
;
7129 ssh
->v1_compressing
= FALSE
;
7130 ssh
->v2_outgoing_sequence
= 0;
7131 ssh
->ssh1_rdpkt_crstate
= 0;
7132 ssh
->ssh2_rdpkt_crstate
= 0;
7133 ssh
->do_ssh_init_crstate
= 0;
7134 ssh
->ssh_gotdata_crstate
= 0;
7135 ssh
->do_ssh1_connection_crstate
= 0;
7136 ssh
->do_ssh1_login_crstate
= 0;
7137 ssh
->do_ssh2_transport_crstate
= 0;
7138 ssh
->do_ssh2_authconn_crstate
= 0;
7139 ssh
->do_ssh_init_state
= NULL
;
7140 ssh
->do_ssh1_login_state
= NULL
;
7141 ssh
->do_ssh2_transport_state
= NULL
;
7142 ssh
->do_ssh2_authconn_state
= NULL
;
7143 ssh
->mainchan
= NULL
;
7144 ssh
->throttled_all
= 0;
7145 ssh
->v1_stdout_throttling
= 0;
7147 ssh
->queuelen
= ssh
->queuesize
= 0;
7148 ssh
->queueing
= FALSE
;
7150 *backend_handle
= ssh
;
7153 if (crypto_startup() == 0)
7154 return "Microsoft high encryption pack not installed!";
7157 ssh
->frontend
= frontend_handle
;
7158 ssh
->term_width
= ssh
->cfg
.width
;
7159 ssh
->term_height
= ssh
->cfg
.height
;
7161 ssh
->channels
= NULL
;
7162 ssh
->rportfwds
= NULL
;
7167 ssh
->v1_throttle_count
= 0;
7168 ssh
->overall_bufsize
= 0;
7169 ssh
->fallback_cmd
= 0;
7171 ssh
->protocol
= NULL
;
7173 ssh
->protocol_initial_phase_done
= FALSE
;
7177 ssh
->incoming_data_size
= ssh
->outgoing_data_size
=
7178 ssh
->deferred_data_size
= 0L;
7179 ssh
->kex_in_progress
= FALSE
;
7181 p
= connect_to_host(ssh
, host
, port
, realhost
, nodelay
, keepalive
);
7190 static void ssh_free(void *handle
)
7192 Ssh ssh
= (Ssh
) handle
;
7193 struct ssh_channel
*c
;
7194 struct ssh_rportfwd
*pf
;
7196 if (ssh
->v1_cipher_ctx
)
7197 ssh
->cipher
->free_context(ssh
->v1_cipher_ctx
);
7198 if (ssh
->cs_cipher_ctx
)
7199 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
7200 if (ssh
->sc_cipher_ctx
)
7201 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
7202 if (ssh
->cs_mac_ctx
)
7203 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
7204 if (ssh
->sc_mac_ctx
)
7205 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
7206 if (ssh
->cs_comp_ctx
) {
7208 ssh
->cscomp
->compress_cleanup(ssh
->cs_comp_ctx
);
7210 zlib_compress_cleanup(ssh
->cs_comp_ctx
);
7212 if (ssh
->sc_comp_ctx
) {
7214 ssh
->sccomp
->decompress_cleanup(ssh
->sc_comp_ctx
);
7216 zlib_decompress_cleanup(ssh
->sc_comp_ctx
);
7219 dh_cleanup(ssh
->kex_ctx
);
7220 sfree(ssh
->savedhost
);
7222 while (ssh
->queuelen
-- > 0)
7223 ssh_free_packet(ssh
->queue
[ssh
->queuelen
]);
7226 if (ssh
->channels
) {
7227 while ((c
= delpos234(ssh
->channels
, 0)) != NULL
) {
7230 if (c
->u
.x11
.s
!= NULL
)
7231 x11_close(c
->u
.x11
.s
);
7234 if (c
->u
.pfd
.s
!= NULL
)
7235 pfd_close(c
->u
.pfd
.s
);
7240 freetree234(ssh
->channels
);
7241 ssh
->channels
= NULL
;
7244 if (ssh
->rportfwds
) {
7245 while ((pf
= delpos234(ssh
->rportfwds
, 0)) != NULL
)
7247 freetree234(ssh
->rportfwds
);
7248 ssh
->rportfwds
= NULL
;
7250 sfree(ssh
->deferred_send_data
);
7252 x11_free_auth(ssh
->x11auth
);
7253 sfree(ssh
->do_ssh_init_state
);
7254 sfree(ssh
->do_ssh1_login_state
);
7255 sfree(ssh
->do_ssh2_transport_state
);
7256 sfree(ssh
->do_ssh2_authconn_state
);
7257 if (ssh
->crcda_ctx
) {
7258 crcda_free_context(ssh
->crcda_ctx
);
7259 ssh
->crcda_ctx
= NULL
;
7263 expire_timer_context(ssh
);
7265 pinger_free(ssh
->pinger
);
7272 * Reconfigure the SSH backend.
7274 * Currently, this function does nothing very useful. In future,
7275 * however, we could do some handy things with it. For example, we
7276 * could make the port forwarding configurer active in the Change
7277 * Settings box, and this routine could close down existing
7278 * forwardings and open up new ones in response to changes.
7280 static void ssh_reconfig(void *handle
, Config
*cfg
)
7282 Ssh ssh
= (Ssh
) handle
;
7283 pinger_reconfig(ssh
->pinger
, &ssh
->cfg
, cfg
);
7284 ssh
->cfg
= *cfg
; /* STRUCTURE COPY */
7288 * Called to send data down the Telnet connection.
7290 static int ssh_send(void *handle
, char *buf
, int len
)
7292 Ssh ssh
= (Ssh
) handle
;
7294 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
7297 ssh
->protocol(ssh
, (unsigned char *)buf
, len
, 0);
7299 return ssh_sendbuffer(ssh
);
7303 * Called to query the current amount of buffered stdin data.
7305 static int ssh_sendbuffer(void *handle
)
7307 Ssh ssh
= (Ssh
) handle
;
7310 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
7314 * If the SSH socket itself has backed up, add the total backup
7315 * size on that to any individual buffer on the stdin channel.
7318 if (ssh
->throttled_all
)
7319 override_value
= ssh
->overall_bufsize
;
7321 if (ssh
->version
== 1) {
7322 return override_value
;
7323 } else if (ssh
->version
== 2) {
7324 if (!ssh
->mainchan
|| ssh
->mainchan
->closes
> 0)
7325 return override_value
;
7327 return (override_value
+
7328 bufchain_size(&ssh
->mainchan
->v
.v2
.outbuffer
));
7335 * Called to set the size of the window from SSH's POV.
7337 static void ssh_size(void *handle
, int width
, int height
)
7339 Ssh ssh
= (Ssh
) handle
;
7340 struct Packet
*pktout
;
7342 ssh
->term_width
= width
;
7343 ssh
->term_height
= height
;
7345 switch (ssh
->state
) {
7346 case SSH_STATE_BEFORE_SIZE
:
7347 case SSH_STATE_PREPACKET
:
7348 case SSH_STATE_CLOSED
:
7349 break; /* do nothing */
7350 case SSH_STATE_INTERMED
:
7351 ssh
->size_needed
= TRUE
; /* buffer for later */
7353 case SSH_STATE_SESSION
:
7354 if (!ssh
->cfg
.nopty
) {
7355 if (ssh
->version
== 1) {
7356 send_packet(ssh
, SSH1_CMSG_WINDOW_SIZE
,
7357 PKT_INT
, ssh
->term_height
,
7358 PKT_INT
, ssh
->term_width
,
7359 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
7360 } else if (ssh
->mainchan
) {
7361 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7362 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
7363 ssh2_pkt_addstring(pktout
, "window-change");
7364 ssh2_pkt_addbool(pktout
, 0);
7365 ssh2_pkt_adduint32(pktout
, ssh
->term_width
);
7366 ssh2_pkt_adduint32(pktout
, ssh
->term_height
);
7367 ssh2_pkt_adduint32(pktout
, 0);
7368 ssh2_pkt_adduint32(pktout
, 0);
7369 ssh2_pkt_send(ssh
, pktout
);
7377 * Return a list of the special codes that make sense in this
7380 static const struct telnet_special
*ssh_get_specials(void *handle
)
7382 static const struct telnet_special ignore_special
[] = {
7383 {"IGNORE message", TS_NOP
},
7384 {"Repeat key exchange", TS_REKEY
},
7386 static const struct telnet_special ssh2_session_specials
[] = {
7389 /* These are the signal names defined by draft-ietf-secsh-connect-19.
7390 * They include all the ISO C signals, but are a subset of the POSIX
7391 * required signals. */
7392 {"SIGINT (Interrupt)", TS_SIGINT
},
7393 {"SIGTERM (Terminate)", TS_SIGTERM
},
7394 {"SIGKILL (Kill)", TS_SIGKILL
},
7395 {"SIGQUIT (Quit)", TS_SIGQUIT
},
7396 {"SIGHUP (Hangup)", TS_SIGHUP
},
7397 {"More signals", TS_SUBMENU
},
7398 {"SIGABRT", TS_SIGABRT
}, {"SIGALRM", TS_SIGALRM
},
7399 {"SIGFPE", TS_SIGFPE
}, {"SIGILL", TS_SIGILL
},
7400 {"SIGPIPE", TS_SIGPIPE
}, {"SIGSEGV", TS_SIGSEGV
},
7401 {"SIGUSR1", TS_SIGUSR1
}, {"SIGUSR2", TS_SIGUSR2
},
7404 static const struct telnet_special specials_end
[] = {
7407 static struct telnet_special ssh_specials
[lenof(ignore_special
) +
7408 lenof(ssh2_session_specials
) +
7409 lenof(specials_end
)];
7410 Ssh ssh
= (Ssh
) handle
;
7412 #define ADD_SPECIALS(name) \
7414 assert((i + lenof(name)) <= lenof(ssh_specials)); \
7415 memcpy(&ssh_specials[i], name, sizeof name); \
7419 if (ssh
->version
== 1) {
7420 /* Don't bother offering IGNORE if we've decided the remote
7421 * won't cope with it, since we wouldn't bother sending it if
7423 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
))
7424 ADD_SPECIALS(ignore_special
);
7425 } else if (ssh
->version
== 2) {
7426 ADD_SPECIALS(ignore_special
);
7428 ADD_SPECIALS(ssh2_session_specials
);
7429 } /* else we're not ready yet */
7432 ADD_SPECIALS(specials_end
);
7433 return ssh_specials
;
7441 * Send Telnet special codes. TS_EOF is useful for `plink', so you
7442 * can send an EOF and collect resulting output (e.g. `plink
7445 static void ssh_special(void *handle
, Telnet_Special code
)
7447 Ssh ssh
= (Ssh
) handle
;
7448 struct Packet
*pktout
;
7450 if (code
== TS_EOF
) {
7451 if (ssh
->state
!= SSH_STATE_SESSION
) {
7453 * Buffer the EOF in case we are pre-SESSION, so we can
7454 * send it as soon as we reach SESSION.
7457 ssh
->eof_needed
= TRUE
;
7460 if (ssh
->version
== 1) {
7461 send_packet(ssh
, SSH1_CMSG_EOF
, PKT_END
);
7462 } else if (ssh
->mainchan
) {
7463 struct Packet
*pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF
);
7464 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
7465 ssh2_pkt_send(ssh
, pktout
);
7467 logevent("Sent EOF message");
7468 } else if (code
== TS_PING
|| code
== TS_NOP
) {
7469 if (ssh
->state
== SSH_STATE_CLOSED
7470 || ssh
->state
== SSH_STATE_PREPACKET
) return;
7471 if (ssh
->version
== 1) {
7472 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
))
7473 send_packet(ssh
, SSH1_MSG_IGNORE
, PKT_STR
, "", PKT_END
);
7475 pktout
= ssh2_pkt_init(SSH2_MSG_IGNORE
);
7476 ssh2_pkt_addstring_start(pktout
);
7477 ssh2_pkt_send_noqueue(ssh
, pktout
);
7479 } else if (code
== TS_REKEY
) {
7480 if (!ssh
->kex_in_progress
&& ssh
->version
== 2) {
7481 do_ssh2_transport(ssh
, "Initiating key re-exchange at"
7482 " user request", -1, NULL
);
7484 } else if (code
== TS_BRK
) {
7485 if (ssh
->state
== SSH_STATE_CLOSED
7486 || ssh
->state
== SSH_STATE_PREPACKET
) return;
7487 if (ssh
->version
== 1) {
7488 logevent("Unable to send BREAK signal in SSH1");
7489 } else if (ssh
->mainchan
) {
7490 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7491 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
7492 ssh2_pkt_addstring(pktout
, "break");
7493 ssh2_pkt_addbool(pktout
, 0);
7494 ssh2_pkt_adduint32(pktout
, 0); /* default break length */
7495 ssh2_pkt_send(ssh
, pktout
);
7498 /* Is is a POSIX signal? */
7499 char *signame
= NULL
;
7500 if (code
== TS_SIGABRT
) signame
= "ABRT";
7501 if (code
== TS_SIGALRM
) signame
= "ALRM";
7502 if (code
== TS_SIGFPE
) signame
= "FPE";
7503 if (code
== TS_SIGHUP
) signame
= "HUP";
7504 if (code
== TS_SIGILL
) signame
= "ILL";
7505 if (code
== TS_SIGINT
) signame
= "INT";
7506 if (code
== TS_SIGKILL
) signame
= "KILL";
7507 if (code
== TS_SIGPIPE
) signame
= "PIPE";
7508 if (code
== TS_SIGQUIT
) signame
= "QUIT";
7509 if (code
== TS_SIGSEGV
) signame
= "SEGV";
7510 if (code
== TS_SIGTERM
) signame
= "TERM";
7511 if (code
== TS_SIGUSR1
) signame
= "USR1";
7512 if (code
== TS_SIGUSR2
) signame
= "USR2";
7513 /* The SSH-2 protocol does in principle support arbitrary named
7514 * signals, including signame@domain, but we don't support those. */
7516 /* It's a signal. */
7517 if (ssh
->version
== 2 && ssh
->mainchan
) {
7518 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7519 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
7520 ssh2_pkt_addstring(pktout
, "signal");
7521 ssh2_pkt_addbool(pktout
, 0);
7522 ssh2_pkt_addstring(pktout
, signame
);
7523 ssh2_pkt_send(ssh
, pktout
);
7524 logeventf(ssh
, "Sent signal SIG%s", signame
);
7527 /* Never heard of it. Do nothing */
7532 void *new_sock_channel(void *handle
, Socket s
)
7534 Ssh ssh
= (Ssh
) handle
;
7535 struct ssh_channel
*c
;
7536 c
= snew(struct ssh_channel
);
7540 c
->remoteid
= -1; /* to be set when open confirmed */
7541 c
->localid
= alloc_channel_id(ssh
);
7543 c
->type
= CHAN_SOCKDATA_DORMANT
;/* identify channel type */
7545 bufchain_init(&c
->v
.v2
.outbuffer
);
7546 add234(ssh
->channels
, c
);
7552 * This is called when stdout/stderr (the entity to which
7553 * from_backend sends data) manages to clear some backlog.
7555 static void ssh_unthrottle(void *handle
, int bufsize
)
7557 Ssh ssh
= (Ssh
) handle
;
7558 if (ssh
->version
== 1) {
7559 if (ssh
->v1_stdout_throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
7560 ssh
->v1_stdout_throttling
= 0;
7561 ssh1_throttle(ssh
, -1);
7564 if (ssh
->mainchan
&& ssh
->mainchan
->closes
== 0)
7565 ssh2_set_window(ssh
->mainchan
, OUR_V2_WINSIZE
- bufsize
);
7569 void ssh_send_port_open(void *channel
, char *hostname
, int port
, char *org
)
7571 struct ssh_channel
*c
= (struct ssh_channel
*)channel
;
7573 struct Packet
*pktout
;
7575 logeventf(ssh
, "Opening forwarded connection to %s:%d", hostname
, port
);
7577 if (ssh
->version
== 1) {
7578 send_packet(ssh
, SSH1_MSG_PORT_OPEN
,
7579 PKT_INT
, c
->localid
,
7582 //PKT_STR, <org:orgport>,
7585 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
7586 ssh2_pkt_addstring(pktout
, "direct-tcpip");
7587 ssh2_pkt_adduint32(pktout
, c
->localid
);
7588 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
7589 ssh2_pkt_adduint32(pktout
, c
->v
.v2
.locwindow
);/* our window size */
7590 ssh2_pkt_adduint32(pktout
, 0x4000UL
); /* our max pkt size */
7591 ssh2_pkt_addstring(pktout
, hostname
);
7592 ssh2_pkt_adduint32(pktout
, port
);
7594 * We make up values for the originator data; partly it's
7595 * too much hassle to keep track, and partly I'm not
7596 * convinced the server should be told details like that
7597 * about my local network configuration.
7599 ssh2_pkt_addstring(pktout
, "client-side-connection");
7600 ssh2_pkt_adduint32(pktout
, 0);
7601 ssh2_pkt_send(ssh
, pktout
);
7605 static Socket
ssh_socket(void *handle
)
7607 Ssh ssh
= (Ssh
) handle
;
7611 static int ssh_sendok(void *handle
)
7613 Ssh ssh
= (Ssh
) handle
;
7614 return ssh
->send_ok
;
7617 static int ssh_ldisc(void *handle
, int option
)
7619 Ssh ssh
= (Ssh
) handle
;
7620 if (option
== LD_ECHO
)
7621 return ssh
->echoing
;
7622 if (option
== LD_EDIT
)
7623 return ssh
->editing
;
7627 static void ssh_provide_ldisc(void *handle
, void *ldisc
)
7629 Ssh ssh
= (Ssh
) handle
;
7633 static void ssh_provide_logctx(void *handle
, void *logctx
)
7635 Ssh ssh
= (Ssh
) handle
;
7636 ssh
->logctx
= logctx
;
7639 static int ssh_return_exitcode(void *handle
)
7641 Ssh ssh
= (Ssh
) handle
;
7645 return (ssh
->exitcode
>= 0 ? ssh
->exitcode
: 0);
7649 * Gross hack: pscp will try to start SFTP but fall back to scp1 if
7650 * that fails. This variable is the means by which scp.c can reach
7651 * into the SSH code and find out which one it got.
7653 extern int ssh_fallback_cmd(void *handle
)
7655 Ssh ssh
= (Ssh
) handle
;
7656 return ssh
->fallback_cmd
;
7659 Backend ssh_backend
= {
7669 ssh_return_exitcode
,