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_DHGROUP1 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_DHGROUP1
);
226 translatec(SSH2_MSG_KEXDH_REPLY
, SSH2_PKTCTX_DHGROUP1
);
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
,
368 const static struct ssh_signkey
*hostkey_algs
[] = { &ssh_rsa
, &ssh_dss
};
370 static void *nullmac_make_context(void)
374 static void nullmac_free_context(void *handle
)
377 static void nullmac_key(void *handle
, unsigned char *key
)
380 static void nullmac_generate(void *handle
, unsigned char *blk
, int len
,
384 static int nullmac_verify(void *handle
, unsigned char *blk
, int len
,
389 const static struct ssh_mac ssh_mac_none
= {
390 nullmac_make_context
, nullmac_free_context
, nullmac_key
,
391 nullmac_generate
, nullmac_verify
, "none", 0
393 const static struct ssh_mac
*macs
[] = {
394 &ssh_sha1
, &ssh_md5
, &ssh_mac_none
396 const static struct ssh_mac
*buggymacs
[] = {
397 &ssh_sha1_buggy
, &ssh_md5
, &ssh_mac_none
400 static void *ssh_comp_none_init(void)
404 static void ssh_comp_none_cleanup(void *handle
)
407 static int ssh_comp_none_block(void *handle
, unsigned char *block
, int len
,
408 unsigned char **outblock
, int *outlen
)
412 static int ssh_comp_none_disable(void *handle
)
416 const static struct ssh_compress ssh_comp_none
= {
418 ssh_comp_none_init
, ssh_comp_none_cleanup
, ssh_comp_none_block
,
419 ssh_comp_none_init
, ssh_comp_none_cleanup
, ssh_comp_none_block
,
420 ssh_comp_none_disable
, NULL
422 extern const struct ssh_compress ssh_zlib
;
423 const static struct ssh_compress
*compressions
[] = {
424 &ssh_zlib
, &ssh_comp_none
427 enum { /* channel types */
432 CHAN_SOCKDATA_DORMANT
/* one the remote hasn't confirmed */
436 * 2-3-4 tree storing channels.
439 Ssh ssh
; /* pointer back to main context */
440 unsigned remoteid
, localid
;
443 * In SSH1, this value contains four bits:
445 * 1 We have sent SSH1_MSG_CHANNEL_CLOSE.
446 * 2 We have sent SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION.
447 * 4 We have received SSH1_MSG_CHANNEL_CLOSE.
448 * 8 We have received SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION.
450 * A channel is completely finished with when all four bits are set.
454 struct ssh1_data_channel
{
457 struct ssh2_data_channel
{
459 unsigned remwindow
, remmaxpkt
;
464 struct ssh_agent_channel
{
465 unsigned char *message
;
466 unsigned char msglen
[4];
467 unsigned lensofar
, totallen
;
469 struct ssh_x11_channel
{
472 struct ssh_pfd_channel
{
479 * 2-3-4 tree storing remote->local port forwardings. SSH 1 and SSH
480 * 2 use this structure in different ways, reflecting SSH 2's
481 * altogether saner approach to port forwarding.
483 * In SSH 1, you arrange a remote forwarding by sending the server
484 * the remote port number, and the local destination host:port.
485 * When a connection comes in, the server sends you back that
486 * host:port pair, and you connect to it. This is a ready-made
487 * security hole if you're not on the ball: a malicious server
488 * could send you back _any_ host:port pair, so if you trustingly
489 * connect to the address it gives you then you've just opened the
490 * entire inside of your corporate network just by connecting
491 * through it to a dodgy SSH server. Hence, we must store a list of
492 * host:port pairs we _are_ trying to forward to, and reject a
493 * connection request from the server if it's not in the list.
495 * In SSH 2, each side of the connection minds its own business and
496 * doesn't send unnecessary information to the other. You arrange a
497 * remote forwarding by sending the server just the remote port
498 * number. When a connection comes in, the server tells you which
499 * of its ports was connected to; and _you_ have to remember what
500 * local host:port pair went with that port number.
502 * Hence: in SSH 1 this structure stores host:port pairs we intend
503 * to allow connections to, and is indexed by those host:port
504 * pairs. In SSH 2 it stores a mapping from source port to
505 * destination host:port pair, and is indexed by source port.
507 struct ssh_rportfwd
{
508 unsigned sport
, dport
;
515 unsigned long sequence
;
520 long encrypted_len
; /* for SSH2 total-size counting */
523 * State associated with packet logging
527 struct logblank_t
*blanks
;
530 static void ssh1_protocol(Ssh ssh
, unsigned char *in
, int inlen
,
531 struct Packet
*pktin
);
532 static void ssh2_protocol(Ssh ssh
, unsigned char *in
, int inlen
,
533 struct Packet
*pktin
);
534 static void ssh1_protocol_setup(Ssh ssh
);
535 static void ssh2_protocol_setup(Ssh ssh
);
536 static void ssh_size(void *handle
, int width
, int height
);
537 static void ssh_special(void *handle
, Telnet_Special
);
538 static int ssh2_try_send(struct ssh_channel
*c
);
539 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
, int len
);
540 static void ssh_throttle_all(Ssh ssh
, int enable
, int bufsize
);
541 static void ssh2_set_window(struct ssh_channel
*c
, unsigned newwin
);
542 static int ssh_sendbuffer(void *handle
);
543 static void ssh_do_close(Ssh ssh
);
544 static unsigned long ssh_pkt_getuint32(struct Packet
*pkt
);
545 static int ssh2_pkt_getbool(struct Packet
*pkt
);
546 static void ssh_pkt_getstring(struct Packet
*pkt
, char **p
, int *length
);
547 static void ssh2_timer(void *ctx
, long now
);
548 static int do_ssh2_transport(Ssh ssh
, unsigned char *in
, int inlen
,
549 struct Packet
*pktin
);
551 struct rdpkt1_state_tag
{
552 long len
, pad
, biglen
, to_read
;
553 unsigned long realcrc
, gotcrc
;
557 struct Packet
*pktin
;
560 struct rdpkt2_state_tag
{
561 long len
, pad
, payload
, packetlen
, maclen
;
564 unsigned long incoming_sequence
;
565 struct Packet
*pktin
;
568 typedef void (*handler_fn_t
)(Ssh ssh
, struct Packet
*pktin
);
571 const struct plug_function_table
*fn
;
572 /* the above field _must_ be first in the structure */
574 SHA_State exhash
, exhashbase
;
581 unsigned char session_key
[32];
583 int v1_remote_protoflags
;
584 int v1_local_protoflags
;
585 int agentfwd_enabled
;
588 const struct ssh_cipher
*cipher
;
591 const struct ssh2_cipher
*cscipher
, *sccipher
;
592 void *cs_cipher_ctx
, *sc_cipher_ctx
;
593 const struct ssh_mac
*csmac
, *scmac
;
594 void *cs_mac_ctx
, *sc_mac_ctx
;
595 const struct ssh_compress
*cscomp
, *sccomp
;
596 void *cs_comp_ctx
, *sc_comp_ctx
;
597 const struct ssh_kex
*kex
;
598 const struct ssh_signkey
*hostkey
;
599 unsigned char v2_session_id
[20];
605 int echoing
, editing
;
609 int ospeed
, ispeed
; /* temporaries */
610 int term_width
, term_height
;
612 tree234
*channels
; /* indexed by local id */
613 struct ssh_channel
*mainchan
; /* primary session channel */
620 SSH_STATE_BEFORE_SIZE
,
626 int size_needed
, eof_needed
;
628 struct Packet
**queue
;
629 int queuelen
, queuesize
;
631 unsigned char *deferred_send_data
;
632 int deferred_len
, deferred_size
;
635 * Gross hack: pscp will try to start SFTP but fall back to
636 * scp1 if that fails. This variable is the means by which
637 * scp.c can reach into the SSH code and find out which one it
643 * Used for username and password input.
645 char *userpass_input_buffer
;
646 int userpass_input_buflen
;
647 int userpass_input_bufpos
;
648 int userpass_input_echo
;
650 char *portfwd_strptr
;
656 int v1_throttle_count
;
659 int v1_stdout_throttling
;
660 int v2_outgoing_sequence
;
662 int ssh1_rdpkt_crstate
;
663 int ssh2_rdpkt_crstate
;
664 int do_ssh_init_crstate
;
665 int ssh_gotdata_crstate
;
666 int do_ssh1_login_crstate
;
667 int do_ssh1_connection_crstate
;
668 int do_ssh2_transport_crstate
;
669 int do_ssh2_authconn_crstate
;
671 void *do_ssh_init_state
;
672 void *do_ssh1_login_state
;
673 void *do_ssh2_transport_state
;
674 void *do_ssh2_authconn_state
;
676 struct rdpkt1_state_tag rdpkt1_state
;
677 struct rdpkt2_state_tag rdpkt2_state
;
679 /* ssh1 and ssh2 use this for different things, but both use it */
680 int protocol_initial_phase_done
;
682 void (*protocol
) (Ssh ssh
, unsigned char *in
, int inlen
,
684 struct Packet
*(*s_rdpkt
) (Ssh ssh
, unsigned char **data
, int *datalen
);
687 * We maintain a full _copy_ of a Config structure here, not
688 * merely a pointer to it. That way, when we're passed a new
689 * one for reconfiguration, we can check the differences and
690 * potentially reconfigure port forwardings etc in mid-session.
695 * Used to transfer data back from async agent callbacks.
697 void *agent_response
;
698 int agent_response_len
;
701 * Dispatch table for packet types that we may have to deal
704 handler_fn_t packet_dispatch
[256];
707 * This module deals with sending keepalives.
712 * Track incoming and outgoing data sizes and time, for
715 unsigned long incoming_data_size
, outgoing_data_size
, deferred_data_size
;
720 #define MAX_DATA_BEFORE_REKEY (0x40000000UL)
721 #define REKEY_TIMEOUT (3600 * TICKSPERSEC)
723 #define logevent(s) logevent(ssh->frontend, s)
725 /* logevent, only printf-formatted. */
726 static void logeventf(Ssh ssh
, const char *fmt
, ...)
732 buf
= dupvprintf(fmt
, ap
);
738 #define bombout(msg) \
740 char *text = dupprintf msg; \
743 connection_fatal(ssh->frontend, "%s", text); \
747 /* Functions to leave bits out of the SSH packet log file. */
749 static void dont_log_password(Ssh ssh
, struct Packet
*pkt
, int blanktype
)
751 if (ssh
->cfg
.logomitpass
)
752 pkt
->logmode
= blanktype
;
755 static void dont_log_data(Ssh ssh
, struct Packet
*pkt
, int blanktype
)
757 if (ssh
->cfg
.logomitdata
)
758 pkt
->logmode
= blanktype
;
761 static void end_log_omission(Ssh ssh
, struct Packet
*pkt
)
763 pkt
->logmode
= PKTLOG_EMIT
;
766 static int ssh_channelcmp(void *av
, void *bv
)
768 struct ssh_channel
*a
= (struct ssh_channel
*) av
;
769 struct ssh_channel
*b
= (struct ssh_channel
*) bv
;
770 if (a
->localid
< b
->localid
)
772 if (a
->localid
> b
->localid
)
776 static int ssh_channelfind(void *av
, void *bv
)
778 unsigned *a
= (unsigned *) av
;
779 struct ssh_channel
*b
= (struct ssh_channel
*) bv
;
787 static int ssh_rportcmp_ssh1(void *av
, void *bv
)
789 struct ssh_rportfwd
*a
= (struct ssh_rportfwd
*) av
;
790 struct ssh_rportfwd
*b
= (struct ssh_rportfwd
*) bv
;
792 if ( (i
= strcmp(a
->dhost
, b
->dhost
)) != 0)
793 return i
< 0 ?
-1 : +1;
794 if (a
->dport
> b
->dport
)
796 if (a
->dport
< b
->dport
)
801 static int ssh_rportcmp_ssh2(void *av
, void *bv
)
803 struct ssh_rportfwd
*a
= (struct ssh_rportfwd
*) av
;
804 struct ssh_rportfwd
*b
= (struct ssh_rportfwd
*) bv
;
806 if (a
->sport
> b
->sport
)
808 if (a
->sport
< b
->sport
)
813 static int alloc_channel_id(Ssh ssh
)
815 const unsigned CHANNEL_NUMBER_OFFSET
= 256;
816 unsigned low
, high
, mid
;
818 struct ssh_channel
*c
;
821 * First-fit allocation of channel numbers: always pick the
822 * lowest unused one. To do this, binary-search using the
823 * counted B-tree to find the largest channel ID which is in a
824 * contiguous sequence from the beginning. (Precisely
825 * everything in that sequence must have ID equal to its tree
826 * index plus CHANNEL_NUMBER_OFFSET.)
828 tsize
= count234(ssh
->channels
);
832 while (high
- low
> 1) {
833 mid
= (high
+ low
) / 2;
834 c
= index234(ssh
->channels
, mid
);
835 if (c
->localid
== mid
+ CHANNEL_NUMBER_OFFSET
)
836 low
= mid
; /* this one is fine */
838 high
= mid
; /* this one is past it */
841 * Now low points to either -1, or the tree index of the
842 * largest ID in the initial sequence.
845 unsigned i
= low
+ 1 + CHANNEL_NUMBER_OFFSET
;
846 assert(NULL
== find234(ssh
->channels
, &i
, ssh_channelfind
));
848 return low
+ 1 + CHANNEL_NUMBER_OFFSET
;
851 static void c_write(Ssh ssh
, const char *buf
, int len
)
853 if ((flags
& FLAG_STDERR
)) {
855 for (i
= 0; i
< len
; i
++)
857 fputc(buf
[i
], stderr
);
860 from_backend(ssh
->frontend
, 1, buf
, len
);
863 static void c_write_untrusted(Ssh ssh
, const char *buf
, int len
)
866 for (i
= 0; i
< len
; i
++) {
868 c_write(ssh
, "\r\n", 2);
869 else if ((buf
[i
] & 0x60) || (buf
[i
] == '\r'))
870 c_write(ssh
, buf
+ i
, 1);
874 static void c_write_str(Ssh ssh
, const char *buf
)
876 c_write(ssh
, buf
, strlen(buf
));
879 static void ssh_free_packet(struct Packet
*pkt
)
884 static struct Packet
*ssh_new_packet(void)
886 struct Packet
*pkt
= snew(struct Packet
);
890 pkt
->logmode
= PKTLOG_EMIT
;
898 * Collect incoming data in the incoming packet buffer.
899 * Decipher and verify the packet when it is completely read.
900 * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets.
901 * Update the *data and *datalen variables.
902 * Return a Packet structure when a packet is completed.
904 static struct Packet
*ssh1_rdpkt(Ssh ssh
, unsigned char **data
, int *datalen
)
906 struct rdpkt1_state_tag
*st
= &ssh
->rdpkt1_state
;
908 crBegin(ssh
->ssh1_rdpkt_crstate
);
910 st
->pktin
= ssh_new_packet();
913 st
->pktin
->length
= 0;
915 for (st
->i
= st
->len
= 0; st
->i
< 4; st
->i
++) {
916 while ((*datalen
) == 0)
918 st
->len
= (st
->len
<< 8) + **data
;
919 (*data
)++, (*datalen
)--;
922 st
->pad
= 8 - (st
->len
% 8);
923 st
->biglen
= st
->len
+ st
->pad
;
924 st
->pktin
->length
= st
->len
- 5;
926 if (st
->biglen
< 0) {
927 bombout(("Extremely large packet length from server suggests"
928 " data stream corruption"));
929 ssh_free_packet(st
->pktin
);
933 st
->pktin
->maxlen
= st
->biglen
;
934 st
->pktin
->data
= snewn(st
->biglen
+ APIEXTRA
, unsigned char);
936 st
->to_read
= st
->biglen
;
937 st
->p
= st
->pktin
->data
;
938 while (st
->to_read
> 0) {
939 st
->chunk
= st
->to_read
;
940 while ((*datalen
) == 0)
942 if (st
->chunk
> (*datalen
))
943 st
->chunk
= (*datalen
);
944 memcpy(st
->p
, *data
, st
->chunk
);
946 *datalen
-= st
->chunk
;
948 st
->to_read
-= st
->chunk
;
951 if (ssh
->cipher
&& detect_attack(ssh
->crcda_ctx
, st
->pktin
->data
,
953 bombout(("Network attack (CRC compensation) detected!"));
954 ssh_free_packet(st
->pktin
);
959 ssh
->cipher
->decrypt(ssh
->v1_cipher_ctx
, st
->pktin
->data
, st
->biglen
);
961 st
->realcrc
= crc32_compute(st
->pktin
->data
, st
->biglen
- 4);
962 st
->gotcrc
= GET_32BIT(st
->pktin
->data
+ st
->biglen
- 4);
963 if (st
->gotcrc
!= st
->realcrc
) {
964 bombout(("Incorrect CRC received on packet"));
965 ssh_free_packet(st
->pktin
);
969 st
->pktin
->body
= st
->pktin
->data
+ st
->pad
+ 1;
970 st
->pktin
->savedpos
= 0;
972 if (ssh
->v1_compressing
) {
973 unsigned char *decompblk
;
975 if (!zlib_decompress_block(ssh
->sc_comp_ctx
,
976 st
->pktin
->body
- 1, st
->pktin
->length
+ 1,
977 &decompblk
, &decomplen
)) {
978 bombout(("Zlib decompression encountered invalid data"));
979 ssh_free_packet(st
->pktin
);
983 if (st
->pktin
->maxlen
< st
->pad
+ decomplen
) {
984 st
->pktin
->maxlen
= st
->pad
+ decomplen
;
985 st
->pktin
->data
= sresize(st
->pktin
->data
,
986 st
->pktin
->maxlen
+ APIEXTRA
,
988 st
->pktin
->body
= st
->pktin
->data
+ st
->pad
+ 1;
991 memcpy(st
->pktin
->body
- 1, decompblk
, decomplen
);
993 st
->pktin
->length
= decomplen
- 1;
996 st
->pktin
->type
= st
->pktin
->body
[-1];
999 * Log incoming packet, possibly omitting sensitive fields.
1003 struct logblank_t blank
;
1004 if (ssh
->cfg
.logomitdata
) {
1005 int do_blank
= FALSE
, blank_prefix
= 0;
1006 /* "Session data" packets - omit the data field */
1007 if ((st
->pktin
->type
== SSH1_SMSG_STDOUT_DATA
) ||
1008 (st
->pktin
->type
== SSH1_SMSG_STDERR_DATA
)) {
1009 do_blank
= TRUE
; blank_prefix
= 0;
1010 } else if (st
->pktin
->type
== SSH1_MSG_CHANNEL_DATA
) {
1011 do_blank
= TRUE
; blank_prefix
= 4;
1014 blank
.offset
= blank_prefix
;
1015 blank
.len
= st
->pktin
->length
;
1016 blank
.type
= PKTLOG_OMIT
;
1020 log_packet(ssh
->logctx
,
1021 PKT_INCOMING
, st
->pktin
->type
,
1022 ssh1_pkt_type(st
->pktin
->type
),
1023 st
->pktin
->body
, st
->pktin
->length
,
1027 crFinish(st
->pktin
);
1030 static struct Packet
*ssh2_rdpkt(Ssh ssh
, unsigned char **data
, int *datalen
)
1032 struct rdpkt2_state_tag
*st
= &ssh
->rdpkt2_state
;
1034 crBegin(ssh
->ssh2_rdpkt_crstate
);
1036 st
->pktin
= ssh_new_packet();
1038 st
->pktin
->type
= 0;
1039 st
->pktin
->length
= 0;
1041 st
->cipherblk
= ssh
->sccipher
->blksize
;
1044 if (st
->cipherblk
< 8)
1047 st
->pktin
->data
= snewn(st
->cipherblk
+ APIEXTRA
, unsigned char);
1050 * Acquire and decrypt the first block of the packet. This will
1051 * contain the length and padding details.
1053 for (st
->i
= st
->len
= 0; st
->i
< st
->cipherblk
; st
->i
++) {
1054 while ((*datalen
) == 0)
1056 st
->pktin
->data
[st
->i
] = *(*data
)++;
1061 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
1062 st
->pktin
->data
, st
->cipherblk
);
1065 * Now get the length and padding figures.
1067 st
->len
= GET_32BIT(st
->pktin
->data
);
1068 st
->pad
= st
->pktin
->data
[4];
1071 * _Completely_ silly lengths should be stomped on before they
1072 * do us any more damage.
1074 if (st
->len
< 0 || st
->pad
< 0 || st
->len
+ st
->pad
< 0) {
1075 bombout(("Incoming packet was garbled on decryption"));
1076 ssh_free_packet(st
->pktin
);
1081 * This enables us to deduce the payload length.
1083 st
->payload
= st
->len
- st
->pad
- 1;
1085 st
->pktin
->length
= st
->payload
+ 5;
1088 * So now we can work out the total packet length.
1090 st
->packetlen
= st
->len
+ 4;
1091 st
->maclen
= ssh
->scmac ? ssh
->scmac
->len
: 0;
1094 * Allocate memory for the rest of the packet.
1096 st
->pktin
->maxlen
= st
->packetlen
+ st
->maclen
;
1097 st
->pktin
->data
= sresize(st
->pktin
->data
,
1098 st
->pktin
->maxlen
+ APIEXTRA
,
1102 * Read and decrypt the remainder of the packet.
1104 for (st
->i
= st
->cipherblk
; st
->i
< st
->packetlen
+ st
->maclen
;
1106 while ((*datalen
) == 0)
1108 st
->pktin
->data
[st
->i
] = *(*data
)++;
1111 /* Decrypt everything _except_ the MAC. */
1113 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
1114 st
->pktin
->data
+ st
->cipherblk
,
1115 st
->packetlen
- st
->cipherblk
);
1117 st
->pktin
->encrypted_len
= st
->packetlen
;
1123 && !ssh
->scmac
->verify(ssh
->sc_mac_ctx
, st
->pktin
->data
, st
->len
+ 4,
1124 st
->incoming_sequence
)) {
1125 bombout(("Incorrect MAC received on packet"));
1126 ssh_free_packet(st
->pktin
);
1130 st
->pktin
->sequence
= st
->incoming_sequence
++;
1133 * Decompress packet payload.
1136 unsigned char *newpayload
;
1139 ssh
->sccomp
->decompress(ssh
->sc_comp_ctx
,
1140 st
->pktin
->data
+ 5, st
->pktin
->length
- 5,
1141 &newpayload
, &newlen
)) {
1142 if (st
->pktin
->maxlen
< newlen
+ 5) {
1143 st
->pktin
->maxlen
= newlen
+ 5;
1144 st
->pktin
->data
= sresize(st
->pktin
->data
,
1145 st
->pktin
->maxlen
+ APIEXTRA
,
1148 st
->pktin
->length
= 5 + newlen
;
1149 memcpy(st
->pktin
->data
+ 5, newpayload
, newlen
);
1154 st
->pktin
->savedpos
= 6;
1155 st
->pktin
->body
= st
->pktin
->data
;
1156 st
->pktin
->type
= st
->pktin
->data
[5];
1159 * Log incoming packet, possibly omitting sensitive fields.
1163 struct logblank_t blank
;
1164 if (ssh
->cfg
.logomitdata
) {
1165 int do_blank
= FALSE
, blank_prefix
= 0;
1166 /* "Session data" packets - omit the data field */
1167 if (st
->pktin
->type
== SSH2_MSG_CHANNEL_DATA
) {
1168 do_blank
= TRUE
; blank_prefix
= 4;
1169 } else if (st
->pktin
->type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
) {
1170 do_blank
= TRUE
; blank_prefix
= 8;
1173 blank
.offset
= blank_prefix
;
1174 blank
.len
= (st
->pktin
->length
-6) - blank_prefix
;
1175 blank
.type
= PKTLOG_OMIT
;
1179 log_packet(ssh
->logctx
, PKT_INCOMING
, st
->pktin
->type
,
1180 ssh2_pkt_type(ssh
->pkt_ctx
, st
->pktin
->type
),
1181 st
->pktin
->data
+6, st
->pktin
->length
-6,
1185 crFinish(st
->pktin
);
1188 static void ssh1_pktout_size(struct Packet
*pkt
, int len
)
1192 len
+= 5; /* type and CRC */
1193 pad
= 8 - (len
% 8);
1196 pkt
->length
= len
- 5;
1197 if (pkt
->maxlen
< biglen
) {
1198 pkt
->maxlen
= biglen
;
1199 pkt
->data
= sresize(pkt
->data
, biglen
+ 4 + APIEXTRA
, unsigned char);
1201 pkt
->body
= pkt
->data
+ 4 + pad
+ 1;
1204 static struct Packet
*s_wrpkt_start(int type
, int len
)
1206 struct Packet
*pkt
= ssh_new_packet();
1207 ssh1_pktout_size(pkt
, len
);
1209 /* Initialise log omission state */
1215 static int s_wrpkt_prepare(Ssh ssh
, struct Packet
*pkt
)
1221 * XXX various versions of SC (including 8.8.4) screw up the
1222 * register allocation in this function and use the same register
1223 * (D6) for len and as a temporary, with predictable results. The
1224 * following sledgehammer prevents this.
1230 pkt
->body
[-1] = pkt
->type
;
1233 log_packet(ssh
->logctx
, PKT_OUTGOING
, pkt
->type
,
1234 ssh1_pkt_type(pkt
->type
),
1235 pkt
->body
, pkt
->length
,
1236 pkt
->nblanks
, pkt
->blanks
);
1237 sfree(pkt
->blanks
); pkt
->blanks
= NULL
;
1240 if (ssh
->v1_compressing
) {
1241 unsigned char *compblk
;
1243 zlib_compress_block(ssh
->cs_comp_ctx
,
1244 pkt
->body
- 1, pkt
->length
+ 1,
1245 &compblk
, &complen
);
1246 ssh1_pktout_size(pkt
, complen
- 1);
1247 memcpy(pkt
->body
- 1, compblk
, complen
);
1251 len
= pkt
->length
+ 5; /* type and CRC */
1252 pad
= 8 - (len
% 8);
1255 for (i
= 0; i
< pad
; i
++)
1256 pkt
->data
[i
+ 4] = random_byte();
1257 crc
= crc32_compute(pkt
->data
+ 4, biglen
- 4);
1258 PUT_32BIT(pkt
->data
+ biglen
, crc
);
1259 PUT_32BIT(pkt
->data
, len
);
1262 ssh
->cipher
->encrypt(ssh
->v1_cipher_ctx
, pkt
->data
+ 4, biglen
);
1267 static void s_wrpkt(Ssh ssh
, struct Packet
*pkt
)
1270 len
= s_wrpkt_prepare(ssh
, pkt
);
1271 backlog
= sk_write(ssh
->s
, (char *)pkt
->data
, len
);
1272 if (backlog
> SSH_MAX_BACKLOG
)
1273 ssh_throttle_all(ssh
, 1, backlog
);
1276 static void s_wrpkt_defer(Ssh ssh
, struct Packet
*pkt
)
1279 len
= s_wrpkt_prepare(ssh
, pkt
);
1280 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1281 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1282 ssh
->deferred_send_data
= sresize(ssh
->deferred_send_data
,
1286 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, pkt
->data
, len
);
1287 ssh
->deferred_len
+= len
;
1291 * Construct a packet with the specified contents.
1293 static struct Packet
*construct_packet(Ssh ssh
, int pkttype
,
1294 va_list ap1
, va_list ap2
)
1296 unsigned char *p
, *argp
, argchar
;
1297 unsigned long argint
;
1298 int pktlen
, argtype
, arglen
;
1303 while ((argtype
= va_arg(ap1
, int)) != PKT_END
) {
1306 (void) va_arg(ap1
, int);
1310 (void) va_arg(ap1
, int);
1314 (void) va_arg(ap1
, unsigned char *);
1315 arglen
= va_arg(ap1
, int);
1319 argp
= va_arg(ap1
, unsigned char *);
1320 arglen
= strlen((char *)argp
);
1321 pktlen
+= 4 + arglen
;
1324 bn
= va_arg(ap1
, Bignum
);
1325 pktlen
+= ssh1_bignum_length(bn
);
1330 /* ignore this pass */
1337 pkt
= s_wrpkt_start(pkttype
, pktlen
);
1340 while ((argtype
= va_arg(ap2
, int)) != PKT_END
) {
1341 int offset
= p
- pkt
->body
, len
= 0;
1343 /* Actual fields in the packet */
1345 argint
= va_arg(ap2
, int);
1346 PUT_32BIT(p
, argint
);
1350 argchar
= (unsigned char) va_arg(ap2
, int);
1355 argp
= va_arg(ap2
, unsigned char *);
1356 arglen
= va_arg(ap2
, int);
1357 memcpy(p
, argp
, arglen
);
1361 argp
= va_arg(ap2
, unsigned char *);
1362 arglen
= strlen((char *)argp
);
1363 PUT_32BIT(p
, arglen
);
1364 memcpy(p
+ 4, argp
, arglen
);
1368 bn
= va_arg(ap2
, Bignum
);
1369 len
= ssh1_write_bignum(p
, bn
);
1371 /* Tokens for modifications to packet logging */
1373 dont_log_password(ssh
, pkt
, PKTLOG_BLANK
);
1376 dont_log_data(ssh
, pkt
, PKTLOG_OMIT
);
1379 end_log_omission(ssh
, pkt
);
1383 /* Deal with logfile omission, if required. */
1384 if (len
&& (pkt
->logmode
!= PKTLOG_EMIT
)) {
1386 pkt
->blanks
= sresize(pkt
->blanks
, pkt
->nblanks
,
1388 pkt
->blanks
[pkt
->nblanks
-1].offset
= offset
;
1389 pkt
->blanks
[pkt
->nblanks
-1].len
= len
;
1390 pkt
->blanks
[pkt
->nblanks
-1].type
= pkt
->logmode
;
1397 static void send_packet(Ssh ssh
, int pkttype
, ...)
1401 va_start(ap1
, pkttype
);
1402 va_start(ap2
, pkttype
);
1403 pkt
= construct_packet(ssh
, pkttype
, ap1
, ap2
);
1407 ssh_free_packet(pkt
);
1410 static void defer_packet(Ssh ssh
, int pkttype
, ...)
1414 va_start(ap1
, pkttype
);
1415 va_start(ap2
, pkttype
);
1416 pkt
= construct_packet(ssh
, pkttype
, ap1
, ap2
);
1419 s_wrpkt_defer(ssh
, pkt
);
1420 ssh_free_packet(pkt
);
1423 static int ssh_versioncmp(char *a
, char *b
)
1426 unsigned long av
, bv
;
1428 av
= strtoul(a
, &ae
, 10);
1429 bv
= strtoul(b
, &be
, 10);
1431 return (av
< bv ?
-1 : +1);
1436 av
= strtoul(ae
, &ae
, 10);
1437 bv
= strtoul(be
, &be
, 10);
1439 return (av
< bv ?
-1 : +1);
1444 * Utility routines for putting an SSH-protocol `string' and
1445 * `uint32' into a SHA state.
1448 static void sha_string(SHA_State
* s
, void *str
, int len
)
1450 unsigned char lenblk
[4];
1451 PUT_32BIT(lenblk
, len
);
1452 SHA_Bytes(s
, lenblk
, 4);
1453 SHA_Bytes(s
, str
, len
);
1456 static void sha_uint32(SHA_State
* s
, unsigned i
)
1458 unsigned char intblk
[4];
1459 PUT_32BIT(intblk
, i
);
1460 SHA_Bytes(s
, intblk
, 4);
1464 * SSH2 packet construction functions.
1466 static void ssh2_pkt_ensure(struct Packet
*pkt
, int length
)
1468 if (pkt
->maxlen
< length
) {
1469 pkt
->maxlen
= length
+ 256;
1470 pkt
->data
= sresize(pkt
->data
, pkt
->maxlen
+ APIEXTRA
, unsigned char);
1473 static void ssh2_pkt_adddata(struct Packet
*pkt
, void *data
, int len
)
1475 if (pkt
->logmode
!= PKTLOG_EMIT
) {
1477 pkt
->blanks
= sresize(pkt
->blanks
, pkt
->nblanks
, struct logblank_t
);
1478 pkt
->blanks
[pkt
->nblanks
-1].offset
= pkt
->length
- 6;
1479 pkt
->blanks
[pkt
->nblanks
-1].len
= len
;
1480 pkt
->blanks
[pkt
->nblanks
-1].type
= pkt
->logmode
;
1483 ssh2_pkt_ensure(pkt
, pkt
->length
);
1484 memcpy(pkt
->data
+ pkt
->length
- len
, data
, len
);
1486 static void ssh2_pkt_addbyte(struct Packet
*pkt
, unsigned char byte
)
1488 ssh2_pkt_adddata(pkt
, &byte
, 1);
1490 static struct Packet
*ssh2_pkt_init(int pkt_type
)
1492 struct Packet
*pkt
= ssh_new_packet();
1494 ssh2_pkt_addbyte(pkt
, (unsigned char) pkt_type
);
1497 static void ssh2_pkt_addbool(struct Packet
*pkt
, unsigned char value
)
1499 ssh2_pkt_adddata(pkt
, &value
, 1);
1501 static void ssh2_pkt_adduint32(struct Packet
*pkt
, unsigned long value
)
1504 PUT_32BIT(x
, value
);
1505 ssh2_pkt_adddata(pkt
, x
, 4);
1507 static void ssh2_pkt_addstring_start(struct Packet
*pkt
)
1509 ssh2_pkt_adduint32(pkt
, 0);
1510 pkt
->savedpos
= pkt
->length
;
1512 static void ssh2_pkt_addstring_str(struct Packet
*pkt
, char *data
)
1514 ssh2_pkt_adddata(pkt
, data
, strlen(data
));
1515 PUT_32BIT(pkt
->data
+ pkt
->savedpos
- 4, pkt
->length
- pkt
->savedpos
);
1517 static void ssh2_pkt_addstring_data(struct Packet
*pkt
, char *data
, int len
)
1519 ssh2_pkt_adddata(pkt
, data
, len
);
1520 PUT_32BIT(pkt
->data
+ pkt
->savedpos
- 4, pkt
->length
- pkt
->savedpos
);
1522 static void ssh2_pkt_addstring(struct Packet
*pkt
, char *data
)
1524 ssh2_pkt_addstring_start(pkt
);
1525 ssh2_pkt_addstring_str(pkt
, data
);
1527 static unsigned char *ssh2_mpint_fmt(Bignum b
, int *len
)
1530 int i
, n
= (bignum_bitcount(b
) + 7) / 8;
1531 p
= snewn(n
+ 1, unsigned char);
1533 fatalbox("out of memory");
1535 for (i
= 1; i
<= n
; i
++)
1536 p
[i
] = bignum_byte(b
, n
- i
);
1538 while (i
<= n
&& p
[i
] == 0 && (p
[i
+ 1] & 0x80) == 0)
1540 memmove(p
, p
+ i
, n
+ 1 - i
);
1544 static void ssh2_pkt_addmp(struct Packet
*pkt
, Bignum b
)
1548 p
= ssh2_mpint_fmt(b
, &len
);
1549 ssh2_pkt_addstring_start(pkt
);
1550 ssh2_pkt_addstring_data(pkt
, (char *)p
, len
);
1555 * Construct an SSH2 final-form packet: compress it, encrypt it,
1556 * put the MAC on it. Final packet, ready to be sent, is stored in
1557 * pkt->data. Total length is returned.
1559 static int ssh2_pkt_construct(Ssh ssh
, struct Packet
*pkt
)
1561 int cipherblk
, maclen
, padding
, i
;
1564 log_packet(ssh
->logctx
, PKT_OUTGOING
, pkt
->data
[5],
1565 ssh2_pkt_type(ssh
->pkt_ctx
, pkt
->data
[5]),
1566 pkt
->data
+ 6, pkt
->length
- 6,
1567 pkt
->nblanks
, pkt
->blanks
);
1568 sfree(pkt
->blanks
); pkt
->blanks
= NULL
;
1572 * Compress packet payload.
1575 unsigned char *newpayload
;
1578 ssh
->cscomp
->compress(ssh
->cs_comp_ctx
, pkt
->data
+ 5,
1580 &newpayload
, &newlen
)) {
1582 ssh2_pkt_adddata(pkt
, newpayload
, newlen
);
1588 * Add padding. At least four bytes, and must also bring total
1589 * length (minus MAC) up to a multiple of the block size.
1591 cipherblk
= ssh
->cscipher ? ssh
->cscipher
->blksize
: 8; /* block size */
1592 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
1595 (cipherblk
- (pkt
->length
+ padding
) % cipherblk
) % cipherblk
;
1596 maclen
= ssh
->csmac ? ssh
->csmac
->len
: 0;
1597 ssh2_pkt_ensure(pkt
, pkt
->length
+ padding
+ maclen
);
1598 pkt
->data
[4] = padding
;
1599 for (i
= 0; i
< padding
; i
++)
1600 pkt
->data
[pkt
->length
+ i
] = random_byte();
1601 PUT_32BIT(pkt
->data
, pkt
->length
+ padding
- 4);
1603 ssh
->csmac
->generate(ssh
->cs_mac_ctx
, pkt
->data
,
1604 pkt
->length
+ padding
,
1605 ssh
->v2_outgoing_sequence
);
1606 ssh
->v2_outgoing_sequence
++; /* whether or not we MACed */
1609 ssh
->cscipher
->encrypt(ssh
->cs_cipher_ctx
,
1610 pkt
->data
, pkt
->length
+ padding
);
1612 pkt
->encrypted_len
= pkt
->length
+ padding
;
1614 /* Ready-to-send packet starts at pkt->data. We return length. */
1615 return pkt
->length
+ padding
+ maclen
;
1619 * Routines called from the main SSH code to send packets. There
1620 * are quite a few of these, because we have two separate
1621 * mechanisms for delaying the sending of packets:
1623 * - In order to send an IGNORE message and a password message in
1624 * a single fixed-length blob, we require the ability to
1625 * concatenate the encrypted forms of those two packets _into_ a
1626 * single blob and then pass it to our <network.h> transport
1627 * layer in one go. Hence, there's a deferment mechanism which
1628 * works after packet encryption.
1630 * - In order to avoid sending any connection-layer messages
1631 * during repeat key exchange, we have to queue up any such
1632 * outgoing messages _before_ they are encrypted (and in
1633 * particular before they're allocated sequence numbers), and
1634 * then send them once we've finished.
1636 * I call these mechanisms `defer' and `queue' respectively, so as
1637 * to distinguish them reasonably easily.
1639 * The functions send_noqueue() and defer_noqueue() free the packet
1640 * structure they are passed. Every outgoing packet goes through
1641 * precisely one of these functions in its life; packets passed to
1642 * ssh2_pkt_send() or ssh2_pkt_defer() either go straight to one of
1643 * these or get queued, and then when the queue is later emptied
1644 * the packets are all passed to defer_noqueue().
1648 * Send an SSH2 packet immediately, without queuing or deferring.
1650 static void ssh2_pkt_send_noqueue(Ssh ssh
, struct Packet
*pkt
)
1654 len
= ssh2_pkt_construct(ssh
, pkt
);
1655 backlog
= sk_write(ssh
->s
, (char *)pkt
->data
, len
);
1656 if (backlog
> SSH_MAX_BACKLOG
)
1657 ssh_throttle_all(ssh
, 1, backlog
);
1659 ssh
->outgoing_data_size
+= pkt
->encrypted_len
;
1660 if (!ssh
->kex_in_progress
&&
1661 ssh
->outgoing_data_size
> MAX_DATA_BEFORE_REKEY
)
1662 do_ssh2_transport(ssh
, "Initiating key re-exchange "
1663 "(too much data sent)", -1, NULL
);
1665 ssh_free_packet(pkt
);
1669 * Defer an SSH2 packet.
1671 static void ssh2_pkt_defer_noqueue(Ssh ssh
, struct Packet
*pkt
)
1673 int len
= ssh2_pkt_construct(ssh
, pkt
);
1674 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1675 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1676 ssh
->deferred_send_data
= sresize(ssh
->deferred_send_data
,
1680 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, pkt
->data
, len
);
1681 ssh
->deferred_len
+= len
;
1682 ssh
->deferred_data_size
+= pkt
->encrypted_len
;
1683 ssh_free_packet(pkt
);
1687 * Queue an SSH2 packet.
1689 static void ssh2_pkt_queue(Ssh ssh
, struct Packet
*pkt
)
1691 assert(ssh
->queueing
);
1693 if (ssh
->queuelen
>= ssh
->queuesize
) {
1694 ssh
->queuesize
= ssh
->queuelen
+ 32;
1695 ssh
->queue
= sresize(ssh
->queue
, ssh
->queuesize
, struct Packet
*);
1698 ssh
->queue
[ssh
->queuelen
++] = pkt
;
1702 * Either queue or send a packet, depending on whether queueing is
1705 static void ssh2_pkt_send(Ssh ssh
, struct Packet
*pkt
)
1708 ssh2_pkt_queue(ssh
, pkt
);
1710 ssh2_pkt_send_noqueue(ssh
, pkt
);
1714 * Either queue or defer a packet, depending on whether queueing is
1717 static void ssh2_pkt_defer(Ssh ssh
, struct Packet
*pkt
)
1720 ssh2_pkt_queue(ssh
, pkt
);
1722 ssh2_pkt_defer_noqueue(ssh
, pkt
);
1726 * Send the whole deferred data block constructed by
1727 * ssh2_pkt_defer() or SSH1's defer_packet().
1729 * The expected use of the defer mechanism is that you call
1730 * ssh2_pkt_defer() a few times, then call ssh_pkt_defersend(). If
1731 * not currently queueing, this simply sets up deferred_send_data
1732 * and then sends it. If we _are_ currently queueing, the calls to
1733 * ssh2_pkt_defer() put the deferred packets on to the queue
1734 * instead, and therefore ssh_pkt_defersend() has no deferred data
1735 * to send. Hence, there's no need to make it conditional on
1738 static void ssh_pkt_defersend(Ssh ssh
)
1741 backlog
= sk_write(ssh
->s
, (char *)ssh
->deferred_send_data
,
1743 ssh
->deferred_len
= ssh
->deferred_size
= 0;
1744 sfree(ssh
->deferred_send_data
);
1745 ssh
->deferred_send_data
= NULL
;
1746 if (backlog
> SSH_MAX_BACKLOG
)
1747 ssh_throttle_all(ssh
, 1, backlog
);
1749 ssh
->outgoing_data_size
+= ssh
->deferred_data_size
;
1750 if (!ssh
->kex_in_progress
&&
1751 ssh
->outgoing_data_size
> MAX_DATA_BEFORE_REKEY
)
1752 do_ssh2_transport(ssh
, "Initiating key re-exchange "
1753 "(too much data sent)", -1, NULL
);
1754 ssh
->deferred_data_size
= 0;
1758 * Send all queued SSH2 packets. We send them by means of
1759 * ssh2_pkt_defer_noqueue(), in case they included a pair of
1760 * packets that needed to be lumped together.
1762 static void ssh2_pkt_queuesend(Ssh ssh
)
1766 assert(!ssh
->queueing
);
1768 for (i
= 0; i
< ssh
->queuelen
; i
++)
1769 ssh2_pkt_defer_noqueue(ssh
, ssh
->queue
[i
]);
1772 ssh_pkt_defersend(ssh
);
1776 void bndebug(char *string
, Bignum b
)
1780 p
= ssh2_mpint_fmt(b
, &len
);
1781 debug(("%s", string
));
1782 for (i
= 0; i
< len
; i
++)
1783 debug((" %02x", p
[i
]));
1789 static void sha_mpint(SHA_State
* s
, Bignum b
)
1793 p
= ssh2_mpint_fmt(b
, &len
);
1794 sha_string(s
, p
, len
);
1799 * Packet decode functions for both SSH1 and SSH2.
1801 static unsigned long ssh_pkt_getuint32(struct Packet
*pkt
)
1803 unsigned long value
;
1804 if (pkt
->length
- pkt
->savedpos
< 4)
1805 return 0; /* arrgh, no way to decline (FIXME?) */
1806 value
= GET_32BIT(pkt
->body
+ pkt
->savedpos
);
1810 static int ssh2_pkt_getbool(struct Packet
*pkt
)
1812 unsigned long value
;
1813 if (pkt
->length
- pkt
->savedpos
< 1)
1814 return 0; /* arrgh, no way to decline (FIXME?) */
1815 value
= pkt
->body
[pkt
->savedpos
] != 0;
1819 static void ssh_pkt_getstring(struct Packet
*pkt
, char **p
, int *length
)
1824 if (pkt
->length
- pkt
->savedpos
< 4)
1826 len
= GET_32BIT(pkt
->body
+ pkt
->savedpos
);
1831 if (pkt
->length
- pkt
->savedpos
< *length
)
1833 *p
= (char *)(pkt
->body
+ pkt
->savedpos
);
1834 pkt
->savedpos
+= *length
;
1836 static void *ssh_pkt_getdata(struct Packet
*pkt
, int length
)
1838 if (pkt
->length
- pkt
->savedpos
< length
)
1840 pkt
->savedpos
+= length
;
1841 return pkt
->body
+ (pkt
->savedpos
- length
);
1843 static int ssh1_pkt_getrsakey(struct Packet
*pkt
, struct RSAKey
*key
,
1844 unsigned char **keystr
)
1848 j
= makekey(pkt
->body
+ pkt
->savedpos
,
1849 pkt
->length
- pkt
->savedpos
,
1856 assert(pkt
->savedpos
< pkt
->length
);
1860 static Bignum
ssh1_pkt_getmp(struct Packet
*pkt
)
1865 j
= ssh1_read_bignum(pkt
->body
+ pkt
->savedpos
,
1866 pkt
->length
- pkt
->savedpos
, &b
);
1874 static Bignum
ssh2_pkt_getmp(struct Packet
*pkt
)
1880 ssh_pkt_getstring(pkt
, &p
, &length
);
1885 b
= bignum_from_bytes((unsigned char *)p
, length
);
1890 * Helper function to add an SSH2 signature blob to a packet.
1891 * Expects to be shown the public key blob as well as the signature
1892 * blob. Normally works just like ssh2_pkt_addstring, but will
1893 * fiddle with the signature packet if necessary for
1894 * BUG_SSH2_RSA_PADDING.
1896 static void ssh2_add_sigblob(Ssh ssh
, struct Packet
*pkt
,
1897 void *pkblob_v
, int pkblob_len
,
1898 void *sigblob_v
, int sigblob_len
)
1900 unsigned char *pkblob
= (unsigned char *)pkblob_v
;
1901 unsigned char *sigblob
= (unsigned char *)sigblob_v
;
1903 /* dmemdump(pkblob, pkblob_len); */
1904 /* dmemdump(sigblob, sigblob_len); */
1907 * See if this is in fact an ssh-rsa signature and a buggy
1908 * server; otherwise we can just do this the easy way.
1910 if ((ssh
->remote_bugs
& BUG_SSH2_RSA_PADDING
) &&
1911 (GET_32BIT(pkblob
) == 7 && !memcmp(pkblob
+4, "ssh-rsa", 7))) {
1912 int pos
, len
, siglen
;
1915 * Find the byte length of the modulus.
1918 pos
= 4+7; /* skip over "ssh-rsa" */
1919 pos
+= 4 + GET_32BIT(pkblob
+pos
); /* skip over exponent */
1920 len
= GET_32BIT(pkblob
+pos
); /* find length of modulus */
1921 pos
+= 4; /* find modulus itself */
1922 while (len
> 0 && pkblob
[pos
] == 0)
1924 /* debug(("modulus length is %d\n", len)); */
1927 * Now find the signature integer.
1929 pos
= 4+7; /* skip over "ssh-rsa" */
1930 siglen
= GET_32BIT(sigblob
+pos
);
1931 /* debug(("signature length is %d\n", siglen)); */
1933 if (len
!= siglen
) {
1934 unsigned char newlen
[4];
1935 ssh2_pkt_addstring_start(pkt
);
1936 ssh2_pkt_addstring_data(pkt
, (char *)sigblob
, pos
);
1937 /* dmemdump(sigblob, pos); */
1938 pos
+= 4; /* point to start of actual sig */
1939 PUT_32BIT(newlen
, len
);
1940 ssh2_pkt_addstring_data(pkt
, (char *)newlen
, 4);
1941 /* dmemdump(newlen, 4); */
1943 while (len
-- > siglen
) {
1944 ssh2_pkt_addstring_data(pkt
, (char *)newlen
, 1);
1945 /* dmemdump(newlen, 1); */
1947 ssh2_pkt_addstring_data(pkt
, (char *)(sigblob
+pos
), siglen
);
1948 /* dmemdump(sigblob+pos, siglen); */
1952 /* Otherwise fall through and do it the easy way. */
1955 ssh2_pkt_addstring_start(pkt
);
1956 ssh2_pkt_addstring_data(pkt
, (char *)sigblob
, sigblob_len
);
1960 * Examine the remote side's version string and compare it against
1961 * a list of known buggy implementations.
1963 static void ssh_detect_bugs(Ssh ssh
, char *vstring
)
1965 char *imp
; /* pointer to implementation part */
1967 imp
+= strcspn(imp
, "-");
1969 imp
+= strcspn(imp
, "-");
1972 ssh
->remote_bugs
= 0;
1974 if (ssh
->cfg
.sshbug_ignore1
== FORCE_ON
||
1975 (ssh
->cfg
.sshbug_ignore1
== AUTO
&&
1976 (!strcmp(imp
, "1.2.18") || !strcmp(imp
, "1.2.19") ||
1977 !strcmp(imp
, "1.2.20") || !strcmp(imp
, "1.2.21") ||
1978 !strcmp(imp
, "1.2.22") || !strcmp(imp
, "Cisco-1.25") ||
1979 !strcmp(imp
, "OSU_1.4alpha3") || !strcmp(imp
, "OSU_1.5alpha4")))) {
1981 * These versions don't support SSH1_MSG_IGNORE, so we have
1982 * to use a different defence against password length
1985 ssh
->remote_bugs
|= BUG_CHOKES_ON_SSH1_IGNORE
;
1986 logevent("We believe remote version has SSH1 ignore bug");
1989 if (ssh
->cfg
.sshbug_plainpw1
== FORCE_ON
||
1990 (ssh
->cfg
.sshbug_plainpw1
== AUTO
&&
1991 (!strcmp(imp
, "Cisco-1.25") || !strcmp(imp
, "OSU_1.4alpha3")))) {
1993 * These versions need a plain password sent; they can't
1994 * handle having a null and a random length of data after
1997 ssh
->remote_bugs
|= BUG_NEEDS_SSH1_PLAIN_PASSWORD
;
1998 logevent("We believe remote version needs a plain SSH1 password");
2001 if (ssh
->cfg
.sshbug_rsa1
== FORCE_ON
||
2002 (ssh
->cfg
.sshbug_rsa1
== AUTO
&&
2003 (!strcmp(imp
, "Cisco-1.25")))) {
2005 * These versions apparently have no clue whatever about
2006 * RSA authentication and will panic and die if they see
2007 * an AUTH_RSA message.
2009 ssh
->remote_bugs
|= BUG_CHOKES_ON_RSA
;
2010 logevent("We believe remote version can't handle RSA authentication");
2013 if (ssh
->cfg
.sshbug_hmac2
== FORCE_ON
||
2014 (ssh
->cfg
.sshbug_hmac2
== AUTO
&&
2015 !wc_match("* VShell", imp
) &&
2016 (wc_match("2.1.0*", imp
) || wc_match("2.0.*", imp
) ||
2017 wc_match("2.2.0*", imp
) || wc_match("2.3.0*", imp
) ||
2018 wc_match("2.1 *", imp
)))) {
2020 * These versions have the HMAC bug.
2022 ssh
->remote_bugs
|= BUG_SSH2_HMAC
;
2023 logevent("We believe remote version has SSH2 HMAC bug");
2026 if (ssh
->cfg
.sshbug_derivekey2
== FORCE_ON
||
2027 (ssh
->cfg
.sshbug_derivekey2
== AUTO
&&
2028 !wc_match("* VShell", imp
) &&
2029 (wc_match("2.0.0*", imp
) || wc_match("2.0.10*", imp
) ))) {
2031 * These versions have the key-derivation bug (failing to
2032 * include the literal shared secret in the hashes that
2033 * generate the keys).
2035 ssh
->remote_bugs
|= BUG_SSH2_DERIVEKEY
;
2036 logevent("We believe remote version has SSH2 key-derivation bug");
2039 if (ssh
->cfg
.sshbug_rsapad2
== FORCE_ON
||
2040 (ssh
->cfg
.sshbug_rsapad2
== AUTO
&&
2041 (wc_match("OpenSSH_2.[5-9]*", imp
) ||
2042 wc_match("OpenSSH_3.[0-2]*", imp
)))) {
2044 * These versions have the SSH2 RSA padding bug.
2046 ssh
->remote_bugs
|= BUG_SSH2_RSA_PADDING
;
2047 logevent("We believe remote version has SSH2 RSA padding bug");
2050 if (ssh
->cfg
.sshbug_pksessid2
== FORCE_ON
||
2051 (ssh
->cfg
.sshbug_pksessid2
== AUTO
&&
2052 wc_match("OpenSSH_2.[0-2]*", imp
))) {
2054 * These versions have the SSH2 session-ID bug in
2055 * public-key authentication.
2057 ssh
->remote_bugs
|= BUG_SSH2_PK_SESSIONID
;
2058 logevent("We believe remote version has SSH2 public-key-session-ID bug");
2061 if (ssh
->cfg
.sshbug_dhgex2
== FORCE_ON
) {
2063 * User specified the SSH2 DH GEX bug.
2065 ssh
->remote_bugs
|= BUG_SSH2_DH_GEX
;
2066 logevent("We believe remote version has SSH2 DH group exchange bug");
2071 * The `software version' part of an SSH version string is required
2072 * to contain no spaces or minus signs.
2074 static void ssh_fix_verstring(char *str
)
2076 /* Eat "SSH-<protoversion>-". */
2077 assert(*str
== 'S'); str
++;
2078 assert(*str
== 'S'); str
++;
2079 assert(*str
== 'H'); str
++;
2080 assert(*str
== '-'); str
++;
2081 while (*str
&& *str
!= '-') str
++;
2082 assert(*str
== '-'); str
++;
2084 /* Convert minus signs and spaces in the remaining string into
2087 if (*str
== '-' || *str
== ' ')
2093 static int do_ssh_init(Ssh ssh
, unsigned char c
)
2095 struct do_ssh_init_state
{
2103 crState(do_ssh_init_state
);
2105 crBegin(ssh
->do_ssh_init_crstate
);
2107 /* Search for the string "SSH-" in the input. */
2110 static const int transS
[] = { 1, 2, 2, 1 };
2111 static const int transH
[] = { 0, 0, 3, 0 };
2112 static const int transminus
[] = { 0, 0, 0, -1 };
2114 s
->i
= transS
[s
->i
];
2116 s
->i
= transH
[s
->i
];
2118 s
->i
= transminus
[s
->i
];
2123 crReturn(1); /* get another character */
2127 s
->vstring
= snewn(s
->vstrsize
, char);
2128 strcpy(s
->vstring
, "SSH-");
2132 crReturn(1); /* get another char */
2133 if (s
->vslen
>= s
->vstrsize
- 1) {
2135 s
->vstring
= sresize(s
->vstring
, s
->vstrsize
, char);
2137 s
->vstring
[s
->vslen
++] = c
;
2140 s
->version
[s
->i
] = '\0';
2142 } else if (s
->i
< sizeof(s
->version
) - 1)
2143 s
->version
[s
->i
++] = c
;
2144 } else if (c
== '\012')
2148 ssh
->agentfwd_enabled
= FALSE
;
2149 ssh
->rdpkt2_state
.incoming_sequence
= 0;
2151 s
->vstring
[s
->vslen
] = 0;
2152 s
->vstring
[strcspn(s
->vstring
, "\015\012")] = '\0';/* remove EOL chars */
2155 vlog
= snewn(20 + s
->vslen
, char);
2156 sprintf(vlog
, "Server version: %s", s
->vstring
);
2160 ssh_detect_bugs(ssh
, s
->vstring
);
2163 * Decide which SSH protocol version to support.
2166 /* Anything strictly below "2.0" means protocol 1 is supported. */
2167 s
->proto1
= ssh_versioncmp(s
->version
, "2.0") < 0;
2168 /* Anything greater or equal to "1.99" means protocol 2 is supported. */
2169 s
->proto2
= ssh_versioncmp(s
->version
, "1.99") >= 0;
2171 if (ssh
->cfg
.sshprot
== 0 && !s
->proto1
) {
2172 bombout(("SSH protocol version 1 required by user but not provided by server"));
2175 if (ssh
->cfg
.sshprot
== 3 && !s
->proto2
) {
2176 bombout(("SSH protocol version 2 required by user but not provided by server"));
2183 if (s
->proto2
&& (ssh
->cfg
.sshprot
>= 2 || !s
->proto1
)) {
2185 * Construct a v2 version string.
2187 verstring
= dupprintf("SSH-2.0-%s\015\012", sshver
);
2191 * Construct a v1 version string.
2193 verstring
= dupprintf("SSH-%s-%s\012",
2194 (ssh_versioncmp(s
->version
, "1.5") <= 0 ?
2195 s
->version
: "1.5"),
2200 ssh_fix_verstring(verstring
);
2202 if (ssh
->version
== 2) {
2204 * Hash our version string and their version string.
2206 SHA_Init(&ssh
->exhashbase
);
2207 sha_string(&ssh
->exhashbase
, verstring
,
2208 strcspn(verstring
, "\015\012"));
2209 sha_string(&ssh
->exhashbase
, s
->vstring
,
2210 strcspn(s
->vstring
, "\015\012"));
2213 * Initialise SSHv2 protocol.
2215 ssh
->protocol
= ssh2_protocol
;
2216 ssh2_protocol_setup(ssh
);
2217 ssh
->s_rdpkt
= ssh2_rdpkt
;
2220 * Initialise SSHv1 protocol.
2222 ssh
->protocol
= ssh1_protocol
;
2223 ssh1_protocol_setup(ssh
);
2224 ssh
->s_rdpkt
= ssh1_rdpkt
;
2226 logeventf(ssh
, "We claim version: %.*s",
2227 strcspn(verstring
, "\015\012"), verstring
);
2228 sk_write(ssh
->s
, verstring
, strlen(verstring
));
2232 logeventf(ssh
, "Using SSH protocol version %d", ssh
->version
);
2234 update_specials_menu(ssh
->frontend
);
2235 ssh
->state
= SSH_STATE_BEFORE_SIZE
;
2236 ssh
->pinger
= pinger_new(&ssh
->cfg
, &ssh_backend
, ssh
);
2243 static void ssh_gotdata(Ssh ssh
, unsigned char *data
, int datalen
)
2245 crBegin(ssh
->ssh_gotdata_crstate
);
2248 * To begin with, feed the characters one by one to the
2249 * protocol initialisation / selection function do_ssh_init().
2250 * When that returns 0, we're done with the initial greeting
2251 * exchange and can move on to packet discipline.
2254 int ret
; /* need not be kept across crReturn */
2256 crReturnV
; /* more data please */
2257 ret
= do_ssh_init(ssh
, *data
);
2265 * We emerge from that loop when the initial negotiation is
2266 * over and we have selected an s_rdpkt function. Now pass
2267 * everything to s_rdpkt, and then pass the resulting packets
2268 * to the proper protocol handler.
2273 while (datalen
> 0) {
2274 struct Packet
*pktin
= ssh
->s_rdpkt(ssh
, &data
, &datalen
);
2276 ssh
->protocol(ssh
, NULL
, 0, pktin
);
2277 ssh_free_packet(pktin
);
2279 if (ssh
->state
== SSH_STATE_CLOSED
)
2287 static void ssh_do_close(Ssh ssh
)
2290 struct ssh_channel
*c
;
2292 ssh
->state
= SSH_STATE_CLOSED
;
2296 notify_remote_exit(ssh
->frontend
);
2299 * Now we must shut down any port and X forwardings going
2300 * through this connection.
2302 if (ssh
->channels
) {
2303 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
2306 x11_close(c
->u
.x11
.s
);
2309 pfd_close(c
->u
.pfd
.s
);
2312 del234(ssh
->channels
, c
);
2313 if (ssh
->version
== 2)
2314 bufchain_clear(&c
->v
.v2
.outbuffer
);
2320 static int ssh_closing(Plug plug
, const char *error_msg
, int error_code
,
2323 Ssh ssh
= (Ssh
) plug
;
2326 /* A socket error has occurred. */
2327 logevent(error_msg
);
2328 connection_fatal(ssh
->frontend
, "%s", error_msg
);
2330 /* Otherwise, the remote side closed the connection normally. */
2335 static int ssh_receive(Plug plug
, int urgent
, char *data
, int len
)
2337 Ssh ssh
= (Ssh
) plug
;
2338 ssh_gotdata(ssh
, (unsigned char *)data
, len
);
2339 if (ssh
->state
== SSH_STATE_CLOSED
) {
2346 static void ssh_sent(Plug plug
, int bufsize
)
2348 Ssh ssh
= (Ssh
) plug
;
2350 * If the send backlog on the SSH socket itself clears, we
2351 * should unthrottle the whole world if it was throttled.
2353 if (bufsize
< SSH_MAX_BACKLOG
)
2354 ssh_throttle_all(ssh
, 0, bufsize
);
2358 * Connect to specified host and port.
2359 * Returns an error message, or NULL on success.
2360 * Also places the canonical host name into `realhost'. It must be
2361 * freed by the caller.
2363 static const char *connect_to_host(Ssh ssh
, char *host
, int port
,
2364 char **realhost
, int nodelay
, int keepalive
)
2366 static const struct plug_function_table fn_table
= {
2376 ssh
->savedhost
= snewn(1 + strlen(host
), char);
2377 if (!ssh
->savedhost
)
2378 fatalbox("Out of memory");
2379 strcpy(ssh
->savedhost
, host
);
2382 port
= 22; /* default ssh port */
2383 ssh
->savedport
= port
;
2388 logeventf(ssh
, "Looking up host \"%s\"", host
);
2389 addr
= name_lookup(host
, port
, realhost
, &ssh
->cfg
);
2390 if ((err
= sk_addr_error(addr
)) != NULL
) {
2400 sk_getaddr(addr
, addrbuf
, 100);
2401 logeventf(ssh
, "Connecting to %s port %d", addrbuf
, port
);
2403 ssh
->fn
= &fn_table
;
2404 ssh
->s
= new_connection(addr
, *realhost
, port
,
2405 0, 1, nodelay
, keepalive
, (Plug
) ssh
, &ssh
->cfg
);
2406 if ((err
= sk_socket_error(ssh
->s
)) != NULL
) {
2408 notify_remote_exit(ssh
->frontend
);
2416 * Throttle or unthrottle the SSH connection.
2418 static void ssh1_throttle(Ssh ssh
, int adjust
)
2420 int old_count
= ssh
->v1_throttle_count
;
2421 ssh
->v1_throttle_count
+= adjust
;
2422 assert(ssh
->v1_throttle_count
>= 0);
2423 if (ssh
->v1_throttle_count
&& !old_count
) {
2424 sk_set_frozen(ssh
->s
, 1);
2425 } else if (!ssh
->v1_throttle_count
&& old_count
) {
2426 sk_set_frozen(ssh
->s
, 0);
2431 * Throttle or unthrottle _all_ local data streams (for when sends
2432 * on the SSH connection itself back up).
2434 static void ssh_throttle_all(Ssh ssh
, int enable
, int bufsize
)
2437 struct ssh_channel
*c
;
2439 if (enable
== ssh
->throttled_all
)
2441 ssh
->throttled_all
= enable
;
2442 ssh
->overall_bufsize
= bufsize
;
2445 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
2447 case CHAN_MAINSESSION
:
2449 * This is treated separately, outside the switch.
2453 x11_override_throttle(c
->u
.x11
.s
, enable
);
2456 /* Agent channels require no buffer management. */
2459 pfd_override_throttle(c
->u
.pfd
.s
, enable
);
2466 * Username and password input, abstracted off into routines
2467 * reusable in several places - even between SSH1 and SSH2.
2470 /* Set up a username or password input loop on a given buffer. */
2471 static void setup_userpass_input(Ssh ssh
, char *buffer
, int buflen
, int echo
)
2473 ssh
->userpass_input_buffer
= buffer
;
2474 ssh
->userpass_input_buflen
= buflen
;
2475 ssh
->userpass_input_bufpos
= 0;
2476 ssh
->userpass_input_echo
= echo
;
2480 * Process some terminal data in the course of username/password
2481 * input. Returns >0 for success (line of input returned in
2482 * buffer), <0 for failure (user hit ^C/^D, bomb out and exit), 0
2483 * for inconclusive (keep waiting for more input please).
2485 static int process_userpass_input(Ssh ssh
, unsigned char *in
, int inlen
)
2490 switch (c
= *in
++) {
2493 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
] = 0;
2494 ssh
->userpass_input_buffer
[ssh
->userpass_input_buflen
-1] = 0;
2499 if (ssh
->userpass_input_bufpos
> 0) {
2500 if (ssh
->userpass_input_echo
)
2501 c_write_str(ssh
, "\b \b");
2502 ssh
->userpass_input_bufpos
--;
2507 while (ssh
->userpass_input_bufpos
> 0) {
2508 if (ssh
->userpass_input_echo
)
2509 c_write_str(ssh
, "\b \b");
2510 ssh
->userpass_input_bufpos
--;
2519 * This simplistic check for printability is disabled
2520 * when we're doing password input, because some people
2521 * have control characters in their passwords.o
2523 if ((!ssh
->userpass_input_echo
||
2524 (c
>= ' ' && c
<= '~') ||
2525 ((unsigned char) c
>= 160))
2526 && ssh
->userpass_input_bufpos
< ssh
->userpass_input_buflen
-1) {
2527 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
++] = c
;
2528 if (ssh
->userpass_input_echo
)
2529 c_write(ssh
, &c
, 1);
2537 static void ssh_agent_callback(void *sshv
, void *reply
, int replylen
)
2539 Ssh ssh
= (Ssh
) sshv
;
2541 ssh
->agent_response
= reply
;
2542 ssh
->agent_response_len
= replylen
;
2544 if (ssh
->version
== 1)
2545 do_ssh1_login(ssh
, NULL
, -1, NULL
);
2547 do_ssh2_authconn(ssh
, NULL
, -1, NULL
);
2550 static void ssh_agentf_callback(void *cv
, void *reply
, int replylen
)
2552 struct ssh_channel
*c
= (struct ssh_channel
*)cv
;
2554 void *sentreply
= reply
;
2557 /* Fake SSH_AGENT_FAILURE. */
2558 sentreply
= "\0\0\0\1\5";
2561 if (ssh
->version
== 2) {
2562 ssh2_add_channel_data(c
, sentreply
, replylen
);
2565 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
2566 PKT_INT
, c
->remoteid
,
2569 PKT_DATA
, sentreply
, replylen
,
2578 * Handle the key exchange and user authentication phases.
2580 static int do_ssh1_login(Ssh ssh
, unsigned char *in
, int inlen
,
2581 struct Packet
*pktin
)
2584 unsigned char cookie
[8], *ptr
;
2585 struct RSAKey servkey
, hostkey
;
2586 struct MD5Context md5c
;
2587 struct do_ssh1_login_state
{
2589 unsigned char *rsabuf
, *keystr1
, *keystr2
;
2590 unsigned long supported_ciphers_mask
, supported_auths_mask
;
2591 int tried_publickey
, tried_agent
;
2592 int tis_auth_refused
, ccard_auth_refused
;
2593 unsigned char session_id
[16];
2596 void *publickey_blob
;
2597 int publickey_bloblen
;
2603 unsigned char request
[5], *response
, *p
;
2612 crState(do_ssh1_login_state
);
2614 crBegin(ssh
->do_ssh1_login_crstate
);
2619 if (pktin
->type
!= SSH1_SMSG_PUBLIC_KEY
) {
2620 bombout(("Public key packet not received"));
2624 logevent("Received public keys");
2626 ptr
= ssh_pkt_getdata(pktin
, 8);
2628 bombout(("SSH1 public key packet stopped before random cookie"));
2631 memcpy(cookie
, ptr
, 8);
2633 if (!ssh1_pkt_getrsakey(pktin
, &servkey
, &s
->keystr1
) ||
2634 !ssh1_pkt_getrsakey(pktin
, &hostkey
, &s
->keystr2
)) {
2635 bombout(("Failed to read SSH1 public keys from public key packet"));
2640 * Log the host key fingerprint.
2644 logevent("Host key fingerprint is:");
2645 strcpy(logmsg
, " ");
2646 hostkey
.comment
= NULL
;
2647 rsa_fingerprint(logmsg
+ strlen(logmsg
),
2648 sizeof(logmsg
) - strlen(logmsg
), &hostkey
);
2652 ssh
->v1_remote_protoflags
= ssh_pkt_getuint32(pktin
);
2653 s
->supported_ciphers_mask
= ssh_pkt_getuint32(pktin
);
2654 s
->supported_auths_mask
= ssh_pkt_getuint32(pktin
);
2656 ssh
->v1_local_protoflags
=
2657 ssh
->v1_remote_protoflags
& SSH1_PROTOFLAGS_SUPPORTED
;
2658 ssh
->v1_local_protoflags
|= SSH1_PROTOFLAG_SCREEN_NUMBER
;
2661 MD5Update(&md5c
, s
->keystr2
, hostkey
.bytes
);
2662 MD5Update(&md5c
, s
->keystr1
, servkey
.bytes
);
2663 MD5Update(&md5c
, cookie
, 8);
2664 MD5Final(s
->session_id
, &md5c
);
2666 for (i
= 0; i
< 32; i
++)
2667 ssh
->session_key
[i
] = random_byte();
2670 * Verify that the `bits' and `bytes' parameters match.
2672 if (hostkey
.bits
> hostkey
.bytes
* 8 ||
2673 servkey
.bits
> servkey
.bytes
* 8) {
2674 bombout(("SSH1 public keys were badly formatted"));
2678 s
->len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
2680 s
->rsabuf
= snewn(s
->len
, unsigned char);
2682 fatalbox("Out of memory");
2685 * Verify the host key.
2689 * First format the key into a string.
2691 int len
= rsastr_len(&hostkey
);
2692 char fingerprint
[100];
2693 char *keystr
= snewn(len
, char);
2695 fatalbox("Out of memory");
2696 rsastr_fmt(keystr
, &hostkey
);
2697 rsa_fingerprint(fingerprint
, sizeof(fingerprint
), &hostkey
);
2698 verify_ssh_host_key(ssh
->frontend
,
2699 ssh
->savedhost
, ssh
->savedport
, "rsa", keystr
,
2704 for (i
= 0; i
< 32; i
++) {
2705 s
->rsabuf
[i
] = ssh
->session_key
[i
];
2707 s
->rsabuf
[i
] ^= s
->session_id
[i
];
2710 if (hostkey
.bytes
> servkey
.bytes
) {
2711 ret
= rsaencrypt(s
->rsabuf
, 32, &servkey
);
2713 ret
= rsaencrypt(s
->rsabuf
, servkey
.bytes
, &hostkey
);
2715 ret
= rsaencrypt(s
->rsabuf
, 32, &hostkey
);
2717 ret
= rsaencrypt(s
->rsabuf
, hostkey
.bytes
, &servkey
);
2720 bombout(("SSH1 public key encryptions failed due to bad formatting"));
2724 logevent("Encrypted session key");
2727 int cipher_chosen
= 0, warn
= 0;
2728 char *cipher_string
= NULL
;
2730 for (i
= 0; !cipher_chosen
&& i
< CIPHER_MAX
; i
++) {
2731 int next_cipher
= ssh
->cfg
.ssh_cipherlist
[i
];
2732 if (next_cipher
== CIPHER_WARN
) {
2733 /* If/when we choose a cipher, warn about it */
2735 } else if (next_cipher
== CIPHER_AES
) {
2736 /* XXX Probably don't need to mention this. */
2737 logevent("AES not supported in SSH1, skipping");
2739 switch (next_cipher
) {
2740 case CIPHER_3DES
: s
->cipher_type
= SSH_CIPHER_3DES
;
2741 cipher_string
= "3DES"; break;
2742 case CIPHER_BLOWFISH
: s
->cipher_type
= SSH_CIPHER_BLOWFISH
;
2743 cipher_string
= "Blowfish"; break;
2744 case CIPHER_DES
: s
->cipher_type
= SSH_CIPHER_DES
;
2745 cipher_string
= "single-DES"; break;
2747 if (s
->supported_ciphers_mask
& (1 << s
->cipher_type
))
2751 if (!cipher_chosen
) {
2752 if ((s
->supported_ciphers_mask
& (1 << SSH_CIPHER_3DES
)) == 0)
2753 bombout(("Server violates SSH 1 protocol by not "
2754 "supporting 3DES encryption"));
2756 /* shouldn't happen */
2757 bombout(("No supported ciphers found"));
2761 /* Warn about chosen cipher if necessary. */
2763 askcipher(ssh
->frontend
, cipher_string
, 0);
2766 switch (s
->cipher_type
) {
2767 case SSH_CIPHER_3DES
:
2768 logevent("Using 3DES encryption");
2770 case SSH_CIPHER_DES
:
2771 logevent("Using single-DES encryption");
2773 case SSH_CIPHER_BLOWFISH
:
2774 logevent("Using Blowfish encryption");
2778 send_packet(ssh
, SSH1_CMSG_SESSION_KEY
,
2779 PKT_CHAR
, s
->cipher_type
,
2780 PKT_DATA
, cookie
, 8,
2781 PKT_CHAR
, (s
->len
* 8) >> 8, PKT_CHAR
, (s
->len
* 8) & 0xFF,
2782 PKT_DATA
, s
->rsabuf
, s
->len
,
2783 PKT_INT
, ssh
->v1_local_protoflags
, PKT_END
);
2785 logevent("Trying to enable encryption...");
2789 ssh
->cipher
= (s
->cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish_ssh1
:
2790 s
->cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
2792 ssh
->v1_cipher_ctx
= ssh
->cipher
->make_context();
2793 ssh
->cipher
->sesskey(ssh
->v1_cipher_ctx
, ssh
->session_key
);
2794 logeventf(ssh
, "Initialised %s encryption", ssh
->cipher
->text_name
);
2796 ssh
->crcda_ctx
= crcda_make_context();
2797 logevent("Installing CRC compensation attack detector");
2799 if (servkey
.modulus
) {
2800 sfree(servkey
.modulus
);
2801 servkey
.modulus
= NULL
;
2803 if (servkey
.exponent
) {
2804 sfree(servkey
.exponent
);
2805 servkey
.exponent
= NULL
;
2807 if (hostkey
.modulus
) {
2808 sfree(hostkey
.modulus
);
2809 hostkey
.modulus
= NULL
;
2811 if (hostkey
.exponent
) {
2812 sfree(hostkey
.exponent
);
2813 hostkey
.exponent
= NULL
;
2817 if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
2818 bombout(("Encryption not successfully enabled"));
2822 logevent("Successfully started encryption");
2826 if (!*ssh
->cfg
.username
) {
2827 if (ssh_get_line
&& !ssh_getline_pw_only
) {
2828 if (!ssh_get_line("login as: ",
2829 s
->username
, sizeof(s
->username
), FALSE
)) {
2831 * get_line failed to get a username.
2834 logevent("No username provided. Abandoning session.");
2835 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
2839 int ret
; /* need not be kept over crReturn */
2840 c_write_str(ssh
, "login as: ");
2843 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
2845 crWaitUntil(!pktin
);
2846 ret
= process_userpass_input(ssh
, in
, inlen
);
2850 c_write_str(ssh
, "\r\n");
2853 strncpy(s
->username
, ssh
->cfg
.username
, sizeof(s
->username
));
2854 s
->username
[sizeof(s
->username
)-1] = '\0';
2857 send_packet(ssh
, SSH1_CMSG_USER
, PKT_STR
, s
->username
, PKT_END
);
2859 char userlog
[22 + sizeof(s
->username
)];
2860 sprintf(userlog
, "Sent username \"%s\"", s
->username
);
2862 if (flags
& FLAG_INTERACTIVE
&&
2863 (!((flags
& FLAG_STDERR
) && (flags
& FLAG_VERBOSE
)))) {
2864 strcat(userlog
, "\r\n");
2865 c_write_str(ssh
, userlog
);
2872 if ((ssh
->remote_bugs
& BUG_CHOKES_ON_RSA
)) {
2873 /* We must not attempt PK auth. Pretend we've already tried it. */
2874 s
->tried_publickey
= s
->tried_agent
= 1;
2876 s
->tried_publickey
= s
->tried_agent
= 0;
2878 s
->tis_auth_refused
= s
->ccard_auth_refused
= 0;
2879 /* Load the public half of ssh->cfg.keyfile so we notice if it's in Pageant */
2880 if (!filename_is_null(ssh
->cfg
.keyfile
)) {
2881 if (!rsakey_pubblob(&ssh
->cfg
.keyfile
,
2882 &s
->publickey_blob
, &s
->publickey_bloblen
, NULL
))
2883 s
->publickey_blob
= NULL
;
2885 s
->publickey_blob
= NULL
;
2887 while (pktin
->type
== SSH1_SMSG_FAILURE
) {
2888 s
->pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
2890 if (agent_exists() && !s
->tried_agent
) {
2892 * Attempt RSA authentication using Pageant.
2898 logevent("Pageant is running. Requesting keys.");
2900 /* Request the keys held by the agent. */
2901 PUT_32BIT(s
->request
, 1);
2902 s
->request
[4] = SSH1_AGENTC_REQUEST_RSA_IDENTITIES
;
2903 if (!agent_query(s
->request
, 5, &r
, &s
->responselen
,
2904 ssh_agent_callback
, ssh
)) {
2908 bombout(("Unexpected data from server while waiting"
2909 " for agent response"));
2912 } while (pktin
|| inlen
> 0);
2913 r
= ssh
->agent_response
;
2914 s
->responselen
= ssh
->agent_response_len
;
2916 s
->response
= (unsigned char *) r
;
2917 if (s
->response
&& s
->responselen
>= 5 &&
2918 s
->response
[4] == SSH1_AGENT_RSA_IDENTITIES_ANSWER
) {
2919 s
->p
= s
->response
+ 5;
2920 s
->nkeys
= GET_32BIT(s
->p
);
2924 sprintf(buf
, "Pageant has %d SSH1 keys", s
->nkeys
);
2927 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
2930 sprintf(buf
, "Trying Pageant key #%d", s
->keyi
);
2933 if (s
->publickey_blob
&&
2934 !memcmp(s
->p
, s
->publickey_blob
,
2935 s
->publickey_bloblen
)) {
2936 logevent("This key matches configured key file");
2937 s
->tried_publickey
= 1;
2942 do { /* do while (0) to make breaking easy */
2943 n
= ssh1_read_bignum
2944 (s
->p
, s
->responselen
-(s
->p
-s
->response
),
2949 n
= ssh1_read_bignum
2950 (s
->p
, s
->responselen
-(s
->p
-s
->response
),
2955 if (s
->responselen
- (s
->p
-s
->response
) < 4)
2957 s
->commentlen
= GET_32BIT(s
->p
);
2959 if (s
->responselen
- (s
->p
-s
->response
) <
2962 s
->commentp
= (char *)s
->p
;
2963 s
->p
+= s
->commentlen
;
2967 logevent("Pageant key list packet was truncated");
2971 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
2972 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
2974 if (pktin
->type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
2975 logevent("Key refused");
2978 logevent("Received RSA challenge");
2979 if ((s
->challenge
= ssh1_pkt_getmp(pktin
)) == NULL
) {
2980 bombout(("Server's RSA challenge was badly formatted"));
2985 char *agentreq
, *q
, *ret
;
2988 len
= 1 + 4; /* message type, bit count */
2989 len
+= ssh1_bignum_length(s
->key
.exponent
);
2990 len
+= ssh1_bignum_length(s
->key
.modulus
);
2991 len
+= ssh1_bignum_length(s
->challenge
);
2992 len
+= 16; /* session id */
2993 len
+= 4; /* response format */
2994 agentreq
= snewn(4 + len
, char);
2995 PUT_32BIT(agentreq
, len
);
2997 *q
++ = SSH1_AGENTC_RSA_CHALLENGE
;
2998 PUT_32BIT(q
, bignum_bitcount(s
->key
.modulus
));
3000 q
+= ssh1_write_bignum(q
, s
->key
.exponent
);
3001 q
+= ssh1_write_bignum(q
, s
->key
.modulus
);
3002 q
+= ssh1_write_bignum(q
, s
->challenge
);
3003 memcpy(q
, s
->session_id
, 16);
3005 PUT_32BIT(q
, 1); /* response format */
3006 if (!agent_query(agentreq
, len
+ 4, &vret
, &retlen
,
3007 ssh_agent_callback
, ssh
)) {
3012 bombout(("Unexpected data from server"
3013 " while waiting for agent"
3017 } while (pktin
|| inlen
> 0);
3018 vret
= ssh
->agent_response
;
3019 retlen
= ssh
->agent_response_len
;
3024 if (ret
[4] == SSH1_AGENT_RSA_RESPONSE
) {
3025 logevent("Sending Pageant's response");
3026 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
3027 PKT_DATA
, ret
+ 5, 16,
3031 if (pktin
->type
== SSH1_SMSG_SUCCESS
) {
3033 ("Pageant's response accepted");
3034 if (flags
& FLAG_VERBOSE
) {
3035 c_write_str(ssh
, "Authenticated using"
3037 c_write(ssh
, s
->commentp
,
3039 c_write_str(ssh
, "\" from agent\r\n");
3044 ("Pageant's response not accepted");
3047 ("Pageant failed to answer challenge");
3051 logevent("No reply received from Pageant");
3054 freebn(s
->key
.exponent
);
3055 freebn(s
->key
.modulus
);
3056 freebn(s
->challenge
);
3065 if (!filename_is_null(ssh
->cfg
.keyfile
) && !s
->tried_publickey
)
3066 s
->pwpkt_type
= SSH1_CMSG_AUTH_RSA
;
3068 if (ssh
->cfg
.try_tis_auth
&&
3069 (s
->supported_auths_mask
& (1 << SSH1_AUTH_TIS
)) &&
3070 !s
->tis_auth_refused
) {
3071 s
->pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
3072 logevent("Requested TIS authentication");
3073 send_packet(ssh
, SSH1_CMSG_AUTH_TIS
, PKT_END
);
3075 if (pktin
->type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
3076 logevent("TIS authentication declined");
3077 if (flags
& FLAG_INTERACTIVE
)
3078 c_write_str(ssh
, "TIS authentication refused.\r\n");
3079 s
->tis_auth_refused
= 1;
3085 ssh_pkt_getstring(pktin
, &challenge
, &challengelen
);
3087 bombout(("TIS challenge packet was badly formed"));
3090 logevent("Received TIS challenge");
3091 if (challengelen
> sizeof(s
->prompt
) - 1)
3092 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
3093 memcpy(s
->prompt
, challenge
, challengelen
);
3094 /* Prompt heuristic comes from OpenSSH */
3095 strncpy(s
->prompt
+ challengelen
,
3096 memchr(s
->prompt
, '\n', challengelen
) ?
3097 "": "\r\nResponse: ",
3098 (sizeof s
->prompt
) - challengelen
);
3099 s
->prompt
[(sizeof s
->prompt
) - 1] = '\0';
3102 if (ssh
->cfg
.try_tis_auth
&&
3103 (s
->supported_auths_mask
& (1 << SSH1_AUTH_CCARD
)) &&
3104 !s
->ccard_auth_refused
) {
3105 s
->pwpkt_type
= SSH1_CMSG_AUTH_CCARD_RESPONSE
;
3106 logevent("Requested CryptoCard authentication");
3107 send_packet(ssh
, SSH1_CMSG_AUTH_CCARD
, PKT_END
);
3109 if (pktin
->type
!= SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
3110 logevent("CryptoCard authentication declined");
3111 c_write_str(ssh
, "CryptoCard authentication refused.\r\n");
3112 s
->ccard_auth_refused
= 1;
3118 ssh_pkt_getstring(pktin
, &challenge
, &challengelen
);
3120 bombout(("CryptoCard challenge packet was badly formed"));
3123 logevent("Received CryptoCard challenge");
3124 if (challengelen
> sizeof(s
->prompt
) - 1)
3125 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
3126 memcpy(s
->prompt
, challenge
, challengelen
);
3127 strncpy(s
->prompt
+ challengelen
,
3128 memchr(s
->prompt
, '\n', challengelen
) ?
3129 "" : "\r\nResponse: ",
3130 sizeof(s
->prompt
) - challengelen
);
3131 s
->prompt
[sizeof(s
->prompt
) - 1] = '\0';
3134 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
3135 sprintf(s
->prompt
, "%.90s@%.90s's password: ",
3136 s
->username
, ssh
->savedhost
);
3138 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
3139 char *comment
= NULL
;
3142 if (flags
& FLAG_VERBOSE
)
3143 c_write_str(ssh
, "Trying public key authentication.\r\n");
3144 logeventf(ssh
, "Trying public key \"%s\"",
3145 filename_to_str(&ssh
->cfg
.keyfile
));
3146 type
= key_type(&ssh
->cfg
.keyfile
);
3147 if (type
!= SSH_KEYTYPE_SSH1
) {
3148 sprintf(msgbuf
, "Key is of wrong type (%s)",
3149 key_type_to_str(type
));
3151 c_write_str(ssh
, msgbuf
);
3152 c_write_str(ssh
, "\r\n");
3153 s
->tried_publickey
= 1;
3156 if (!rsakey_encrypted(&ssh
->cfg
.keyfile
, &comment
)) {
3157 if (flags
& FLAG_VERBOSE
)
3158 c_write_str(ssh
, "No passphrase required.\r\n");
3161 sprintf(s
->prompt
, "Passphrase for key \"%.100s\": ", comment
);
3166 * Show password prompt, having first obtained it via a TIS
3167 * or CryptoCard exchange if we're doing TIS or CryptoCard
3171 if (!ssh_get_line(s
->prompt
, s
->password
,
3172 sizeof(s
->password
), TRUE
)) {
3174 * get_line failed to get a password (for example
3175 * because one was supplied on the command line
3176 * which has already failed to work). Terminate.
3178 send_packet(ssh
, SSH1_MSG_DISCONNECT
,
3179 PKT_STR
, "No more passwords available to try",
3181 logevent("Unable to authenticate");
3182 connection_fatal(ssh
->frontend
, "Unable to authenticate");
3183 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
3187 /* Prompt may have come from server. We've munged it a bit, so
3188 * we know it to be zero-terminated at least once. */
3189 int ret
; /* need not be saved over crReturn */
3190 c_write_untrusted(ssh
, s
->prompt
, strlen(s
->prompt
));
3193 setup_userpass_input(ssh
, s
->password
, sizeof(s
->password
), 0);
3195 crWaitUntil(!pktin
);
3196 ret
= process_userpass_input(ssh
, in
, inlen
);
3200 c_write_str(ssh
, "\r\n");
3204 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
3206 * Try public key authentication with the specified
3209 s
->tried_publickey
= 1;
3212 const char *error
= NULL
;
3213 int ret
= loadrsakey(&ssh
->cfg
.keyfile
, &s
->key
, s
->password
,
3216 c_write_str(ssh
, "Couldn't load private key from ");
3217 c_write_str(ssh
, filename_to_str(&ssh
->cfg
.keyfile
));
3218 c_write_str(ssh
, " (");
3219 c_write_str(ssh
, error
);
3220 c_write_str(ssh
, ").\r\n");
3221 continue; /* go and try password */
3224 c_write_str(ssh
, "Wrong passphrase.\r\n");
3225 s
->tried_publickey
= 0;
3226 continue; /* try again */
3231 * Send a public key attempt.
3233 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
3234 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
3237 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3238 c_write_str(ssh
, "Server refused our public key.\r\n");
3239 continue; /* go and try password */
3241 if (pktin
->type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
3242 bombout(("Bizarre response to offer of public key"));
3248 unsigned char buffer
[32];
3249 Bignum challenge
, response
;
3251 if ((challenge
= ssh1_pkt_getmp(pktin
)) == NULL
) {
3252 bombout(("Server's RSA challenge was badly formatted"));
3255 response
= rsadecrypt(challenge
, &s
->key
);
3256 freebn(s
->key
.private_exponent
);/* burn the evidence */
3258 for (i
= 0; i
< 32; i
++) {
3259 buffer
[i
] = bignum_byte(response
, 31 - i
);
3263 MD5Update(&md5c
, buffer
, 32);
3264 MD5Update(&md5c
, s
->session_id
, 16);
3265 MD5Final(buffer
, &md5c
);
3267 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
3268 PKT_DATA
, buffer
, 16, PKT_END
);
3275 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3276 if (flags
& FLAG_VERBOSE
)
3277 c_write_str(ssh
, "Failed to authenticate with"
3278 " our public key.\r\n");
3279 continue; /* go and try password */
3280 } else if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
3281 bombout(("Bizarre response to RSA authentication response"));
3285 break; /* we're through! */
3287 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
3289 * Defence against traffic analysis: we send a
3290 * whole bunch of packets containing strings of
3291 * different lengths. One of these strings is the
3292 * password, in a SSH1_CMSG_AUTH_PASSWORD packet.
3293 * The others are all random data in
3294 * SSH1_MSG_IGNORE packets. This way a passive
3295 * listener can't tell which is the password, and
3296 * hence can't deduce the password length.
3298 * Anybody with a password length greater than 16
3299 * bytes is going to have enough entropy in their
3300 * password that a listener won't find it _that_
3301 * much help to know how long it is. So what we'll
3304 * - if password length < 16, we send 15 packets
3305 * containing string lengths 1 through 15
3307 * - otherwise, we let N be the nearest multiple
3308 * of 8 below the password length, and send 8
3309 * packets containing string lengths N through
3310 * N+7. This won't obscure the order of
3311 * magnitude of the password length, but it will
3312 * introduce a bit of extra uncertainty.
3314 * A few servers (the old 1.2.18 through 1.2.22)
3315 * can't deal with SSH1_MSG_IGNORE. For these
3316 * servers, we need an alternative defence. We make
3317 * use of the fact that the password is interpreted
3318 * as a C string: so we can append a NUL, then some
3321 * One server (a Cisco one) can deal with neither
3322 * SSH1_MSG_IGNORE _nor_ a padded password string.
3323 * For this server we are left with no defences
3324 * against password length sniffing.
3326 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
)) {
3328 * The server can deal with SSH1_MSG_IGNORE, so
3329 * we can use the primary defence.
3331 int bottom
, top
, pwlen
, i
;
3334 pwlen
= strlen(s
->password
);
3336 bottom
= 0; /* zero length passwords are OK! :-) */
3339 bottom
= pwlen
& ~7;
3343 assert(pwlen
>= bottom
&& pwlen
<= top
);
3345 randomstr
= snewn(top
+ 1, char);
3347 for (i
= bottom
; i
<= top
; i
++) {
3349 defer_packet(ssh
, s
->pwpkt_type
,
3350 PKTT_PASSWORD
, PKT_STR
, s
->password
,
3351 PKTT_OTHER
, PKT_END
);
3353 for (j
= 0; j
< i
; j
++) {
3355 randomstr
[j
] = random_byte();
3356 } while (randomstr
[j
] == '\0');
3358 randomstr
[i
] = '\0';
3359 defer_packet(ssh
, SSH1_MSG_IGNORE
,
3360 PKT_STR
, randomstr
, PKT_END
);
3363 logevent("Sending password with camouflage packets");
3364 ssh_pkt_defersend(ssh
);
3367 else if (!(ssh
->remote_bugs
& BUG_NEEDS_SSH1_PLAIN_PASSWORD
)) {
3369 * The server can't deal with SSH1_MSG_IGNORE
3370 * but can deal with padded passwords, so we
3371 * can use the secondary defence.
3377 len
= strlen(s
->password
);
3378 if (len
< sizeof(string
)) {
3380 strcpy(string
, s
->password
);
3381 len
++; /* cover the zero byte */
3382 while (len
< sizeof(string
)) {
3383 string
[len
++] = (char) random_byte();
3388 logevent("Sending length-padded password");
3389 send_packet(ssh
, s
->pwpkt_type
, PKTT_PASSWORD
,
3390 PKT_INT
, len
, PKT_DATA
, ss
, len
,
3391 PKTT_OTHER
, PKT_END
);
3394 * The server has _both_
3395 * BUG_CHOKES_ON_SSH1_IGNORE and
3396 * BUG_NEEDS_SSH1_PLAIN_PASSWORD. There is
3397 * therefore nothing we can do.
3400 len
= strlen(s
->password
);
3401 logevent("Sending unpadded password");
3402 send_packet(ssh
, s
->pwpkt_type
,
3403 PKTT_PASSWORD
, PKT_INT
, len
,
3404 PKT_DATA
, s
->password
, len
,
3405 PKTT_OTHER
, PKT_END
);
3408 send_packet(ssh
, s
->pwpkt_type
, PKTT_PASSWORD
,
3409 PKT_STR
, s
->password
, PKTT_OTHER
, PKT_END
);
3412 logevent("Sent password");
3413 memset(s
->password
, 0, strlen(s
->password
));
3415 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3416 if (flags
& FLAG_VERBOSE
)
3417 c_write_str(ssh
, "Access denied\r\n");
3418 logevent("Authentication refused");
3419 } else if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
3420 bombout(("Strange packet received, type %d", pktin
->type
));
3425 logevent("Authentication successful");
3430 void sshfwd_close(struct ssh_channel
*c
)
3434 if (ssh
->state
!= SSH_STATE_SESSION
) {
3435 assert(ssh
->state
== SSH_STATE_CLOSED
);
3439 if (c
&& !c
->closes
) {
3441 * If the channel's remoteid is -1, we have sent
3442 * CHANNEL_OPEN for this channel, but it hasn't even been
3443 * acknowledged by the server. So we must set a close flag
3444 * on it now, and then when the server acks the channel
3445 * open, we can close it then.
3447 if (((int)c
->remoteid
) != -1) {
3448 if (ssh
->version
== 1) {
3449 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
, PKT_INT
, c
->remoteid
,
3452 struct Packet
*pktout
;
3453 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
3454 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
3455 ssh2_pkt_send(ssh
, pktout
);
3458 c
->closes
= 1; /* sent MSG_CLOSE */
3459 if (c
->type
== CHAN_X11
) {
3461 logevent("Forwarded X11 connection terminated");
3462 } else if (c
->type
== CHAN_SOCKDATA
||
3463 c
->type
== CHAN_SOCKDATA_DORMANT
) {
3465 logevent("Forwarded port closed");
3470 int sshfwd_write(struct ssh_channel
*c
, char *buf
, int len
)
3474 if (ssh
->state
!= SSH_STATE_SESSION
) {
3475 assert(ssh
->state
== SSH_STATE_CLOSED
);
3479 if (ssh
->version
== 1) {
3480 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
3481 PKT_INT
, c
->remoteid
,
3483 PKT_INT
, len
, PKT_DATA
, buf
, len
,
3484 PKTT_OTHER
, PKT_END
);
3486 * In SSH1 we can return 0 here - implying that forwarded
3487 * connections are never individually throttled - because
3488 * the only circumstance that can cause throttling will be
3489 * the whole SSH connection backing up, in which case
3490 * _everything_ will be throttled as a whole.
3494 ssh2_add_channel_data(c
, buf
, len
);
3495 return ssh2_try_send(c
);
3499 void sshfwd_unthrottle(struct ssh_channel
*c
, int bufsize
)
3503 if (ssh
->state
!= SSH_STATE_SESSION
) {
3504 assert(ssh
->state
== SSH_STATE_CLOSED
);
3508 if (ssh
->version
== 1) {
3509 if (c
->v
.v1
.throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
3510 c
->v
.v1
.throttling
= 0;
3511 ssh1_throttle(ssh
, -1);
3514 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
3518 static void ssh1_smsg_stdout_stderr_data(Ssh ssh
, struct Packet
*pktin
)
3521 int stringlen
, bufsize
;
3523 ssh_pkt_getstring(pktin
, &string
, &stringlen
);
3524 if (string
== NULL
) {
3525 bombout(("Incoming terminal data packet was badly formed"));
3529 bufsize
= from_backend(ssh
->frontend
, pktin
->type
== SSH1_SMSG_STDERR_DATA
,
3531 if (!ssh
->v1_stdout_throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
3532 ssh
->v1_stdout_throttling
= 1;
3533 ssh1_throttle(ssh
, +1);
3537 static void ssh1_smsg_x11_open(Ssh ssh
, struct Packet
*pktin
)
3539 /* Remote side is trying to open a channel to talk to our
3540 * X-Server. Give them back a local channel number. */
3541 struct ssh_channel
*c
;
3542 int remoteid
= ssh_pkt_getuint32(pktin
);
3544 logevent("Received X11 connect request");
3545 /* Refuse if X11 forwarding is disabled. */
3546 if (!ssh
->X11_fwd_enabled
) {
3547 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3548 PKT_INT
, remoteid
, PKT_END
);
3549 logevent("Rejected X11 connect request");
3551 c
= snew(struct ssh_channel
);
3554 if (x11_init(&c
->u
.x11
.s
, ssh
->cfg
.x11_display
, c
,
3555 ssh
->x11auth
, NULL
, -1, &ssh
->cfg
) != NULL
) {
3556 logevent("Opening X11 forward connection failed");
3558 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3559 PKT_INT
, remoteid
, PKT_END
);
3562 ("Opening X11 forward connection succeeded");
3563 c
->remoteid
= remoteid
;
3564 c
->localid
= alloc_channel_id(ssh
);
3566 c
->v
.v1
.throttling
= 0;
3567 c
->type
= CHAN_X11
; /* identify channel type */
3568 add234(ssh
->channels
, c
);
3569 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3570 PKT_INT
, c
->remoteid
, PKT_INT
,
3571 c
->localid
, PKT_END
);
3572 logevent("Opened X11 forward channel");
3577 static void ssh1_smsg_agent_open(Ssh ssh
, struct Packet
*pktin
)
3579 /* Remote side is trying to open a channel to talk to our
3580 * agent. Give them back a local channel number. */
3581 struct ssh_channel
*c
;
3582 int remoteid
= ssh_pkt_getuint32(pktin
);
3584 /* Refuse if agent forwarding is disabled. */
3585 if (!ssh
->agentfwd_enabled
) {
3586 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3587 PKT_INT
, remoteid
, PKT_END
);
3589 c
= snew(struct ssh_channel
);
3591 c
->remoteid
= remoteid
;
3592 c
->localid
= alloc_channel_id(ssh
);
3594 c
->v
.v1
.throttling
= 0;
3595 c
->type
= CHAN_AGENT
; /* identify channel type */
3596 c
->u
.a
.lensofar
= 0;
3597 add234(ssh
->channels
, c
);
3598 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3599 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
3604 static void ssh1_msg_port_open(Ssh ssh
, struct Packet
*pktin
)
3606 /* Remote side is trying to open a channel to talk to a
3607 * forwarded port. Give them back a local channel number. */
3608 struct ssh_channel
*c
;
3609 struct ssh_rportfwd pf
;
3612 char *host
, buf
[1024];
3614 c
= snew(struct ssh_channel
);
3617 remoteid
= ssh_pkt_getuint32(pktin
);
3618 ssh_pkt_getstring(pktin
, &host
, &hostsize
);
3619 port
= ssh_pkt_getuint32(pktin
);
3621 if (hostsize
>= lenof(pf
.dhost
))
3622 hostsize
= lenof(pf
.dhost
)-1;
3623 memcpy(pf
.dhost
, host
, hostsize
);
3624 pf
.dhost
[hostsize
] = '\0';
3627 if (find234(ssh
->rportfwds
, &pf
, NULL
) == NULL
) {
3628 sprintf(buf
, "Rejected remote port open request for %s:%d",
3631 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3632 PKT_INT
, remoteid
, PKT_END
);
3634 sprintf(buf
, "Received remote port open request for %s:%d",
3637 e
= pfd_newconnect(&c
->u
.pfd
.s
, pf
.dhost
, port
,
3641 sprintf(buf
, "Port open failed: %s", e
);
3644 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3645 PKT_INT
, remoteid
, PKT_END
);
3647 c
->remoteid
= remoteid
;
3648 c
->localid
= alloc_channel_id(ssh
);
3650 c
->v
.v1
.throttling
= 0;
3651 c
->type
= CHAN_SOCKDATA
; /* identify channel type */
3652 add234(ssh
->channels
, c
);
3653 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3654 PKT_INT
, c
->remoteid
, PKT_INT
,
3655 c
->localid
, PKT_END
);
3656 logevent("Forwarded port opened successfully");
3661 static void ssh1_msg_channel_open_confirmation(Ssh ssh
, struct Packet
*pktin
)
3663 unsigned int remoteid
= ssh_pkt_getuint32(pktin
);
3664 unsigned int localid
= ssh_pkt_getuint32(pktin
);
3665 struct ssh_channel
*c
;
3667 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
3668 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
3669 c
->remoteid
= localid
;
3670 c
->type
= CHAN_SOCKDATA
;
3671 c
->v
.v1
.throttling
= 0;
3672 pfd_confirm(c
->u
.pfd
.s
);
3675 if (c
&& c
->closes
) {
3677 * We have a pending close on this channel,
3678 * which we decided on before the server acked
3679 * the channel open. So now we know the
3680 * remoteid, we can close it again.
3682 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
,
3683 PKT_INT
, c
->remoteid
, PKT_END
);
3687 static void ssh1_msg_channel_open_failure(Ssh ssh
, struct Packet
*pktin
)
3689 unsigned int remoteid
= ssh_pkt_getuint32(pktin
);
3690 struct ssh_channel
*c
;
3692 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
3693 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
3694 logevent("Forwarded connection refused by server");
3695 pfd_close(c
->u
.pfd
.s
);
3696 del234(ssh
->channels
, c
);
3701 static void ssh1_msg_channel_close(Ssh ssh
, struct Packet
*pktin
)
3703 /* Remote side closes a channel. */
3704 unsigned i
= ssh_pkt_getuint32(pktin
);
3705 struct ssh_channel
*c
;
3706 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
3707 if (c
&& ((int)c
->remoteid
) != -1) {
3710 (pktin
->type
== SSH1_MSG_CHANNEL_CLOSE ?
1 : 2);
3712 if ((c
->closes
== 0) && (c
->type
== CHAN_X11
)) {
3713 logevent("Forwarded X11 connection terminated");
3714 assert(c
->u
.x11
.s
!= NULL
);
3715 x11_close(c
->u
.x11
.s
);
3718 if ((c
->closes
== 0) && (c
->type
== CHAN_SOCKDATA
)) {
3719 logevent("Forwarded port closed");
3720 assert(c
->u
.pfd
.s
!= NULL
);
3721 pfd_close(c
->u
.pfd
.s
);
3725 c
->closes
|= (closetype
<< 2); /* seen this message */
3726 if (!(c
->closes
& closetype
)) {
3727 send_packet(ssh
, pktin
->type
, PKT_INT
, c
->remoteid
,
3729 c
->closes
|= closetype
; /* sent it too */
3732 if (c
->closes
== 15) {
3733 del234(ssh
->channels
, c
);
3737 bombout(("Received CHANNEL_CLOSE%s for %s channel %d\n",
3738 pktin
->type
== SSH1_MSG_CHANNEL_CLOSE ?
"" :
3739 "_CONFIRMATION", c ?
"half-open" : "nonexistent",
3744 static void ssh1_msg_channel_data(Ssh ssh
, struct Packet
*pktin
)
3746 /* Data sent down one of our channels. */
3747 int i
= ssh_pkt_getuint32(pktin
);
3750 struct ssh_channel
*c
;
3752 ssh_pkt_getstring(pktin
, &p
, &len
);
3754 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
3759 bufsize
= x11_send(c
->u
.x11
.s
, p
, len
);
3762 bufsize
= pfd_send(c
->u
.pfd
.s
, p
, len
);
3765 /* Data for an agent message. Buffer it. */
3767 if (c
->u
.a
.lensofar
< 4) {
3768 int l
= min(4 - c
->u
.a
.lensofar
, len
);
3769 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
, p
,
3773 c
->u
.a
.lensofar
+= l
;
3775 if (c
->u
.a
.lensofar
== 4) {
3777 4 + GET_32BIT(c
->u
.a
.msglen
);
3778 c
->u
.a
.message
= snewn(c
->u
.a
.totallen
,
3780 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
3782 if (c
->u
.a
.lensofar
>= 4 && len
> 0) {
3784 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
3786 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
, p
,
3790 c
->u
.a
.lensofar
+= l
;
3792 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
3795 if (agent_query(c
->u
.a
.message
,
3798 ssh_agentf_callback
, c
))
3799 ssh_agentf_callback(c
, reply
, replylen
);
3800 sfree(c
->u
.a
.message
);
3801 c
->u
.a
.lensofar
= 0;
3804 bufsize
= 0; /* agent channels never back up */
3807 if (!c
->v
.v1
.throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
3808 c
->v
.v1
.throttling
= 1;
3809 ssh1_throttle(ssh
, +1);
3814 static void ssh1_smsg_exit_status(Ssh ssh
, struct Packet
*pktin
)
3817 ssh
->exitcode
= ssh_pkt_getuint32(pktin
);
3818 sprintf(buf
, "Server sent command exit status %d",
3821 send_packet(ssh
, SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
3823 * In case `helpful' firewalls or proxies tack
3824 * extra human-readable text on the end of the
3825 * session which we might mistake for another
3826 * encrypted packet, we close the session once
3827 * we've sent EXIT_CONFIRMATION.
3829 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
3832 static void do_ssh1_connection(Ssh ssh
, unsigned char *in
, int inlen
,
3833 struct Packet
*pktin
)
3835 crBegin(ssh
->do_ssh1_connection_crstate
);
3837 ssh
->packet_dispatch
[SSH1_SMSG_STDOUT_DATA
] =
3838 ssh
->packet_dispatch
[SSH1_SMSG_STDERR_DATA
] =
3839 ssh1_smsg_stdout_stderr_data
;
3841 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
] =
3842 ssh1_msg_channel_open_confirmation
;
3843 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_OPEN_FAILURE
] =
3844 ssh1_msg_channel_open_failure
;
3845 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_CLOSE
] =
3846 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
] =
3847 ssh1_msg_channel_close
;
3848 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_DATA
] = ssh1_msg_channel_data
;
3849 ssh
->packet_dispatch
[SSH1_SMSG_EXIT_STATUS
] = ssh1_smsg_exit_status
;
3851 if (ssh
->cfg
.agentfwd
&& agent_exists()) {
3852 logevent("Requesting agent forwarding");
3853 send_packet(ssh
, SSH1_CMSG_AGENT_REQUEST_FORWARDING
, PKT_END
);
3857 if (pktin
->type
!= SSH1_SMSG_SUCCESS
3858 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
3859 bombout(("Protocol confusion"));
3861 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3862 logevent("Agent forwarding refused");
3864 logevent("Agent forwarding enabled");
3865 ssh
->agentfwd_enabled
= TRUE
;
3866 ssh
->packet_dispatch
[SSH1_SMSG_AGENT_OPEN
] = ssh1_smsg_agent_open
;
3870 if (ssh
->cfg
.x11_forward
) {
3871 char proto
[20], data
[64];
3872 logevent("Requesting X11 forwarding");
3873 ssh
->x11auth
= x11_invent_auth(proto
, sizeof(proto
),
3874 data
, sizeof(data
), ssh
->cfg
.x11_auth
);
3875 x11_get_real_auth(ssh
->x11auth
, ssh
->cfg
.x11_display
);
3876 if (ssh
->v1_local_protoflags
& SSH1_PROTOFLAG_SCREEN_NUMBER
) {
3877 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
3878 PKT_STR
, proto
, PKT_STR
, data
,
3879 PKT_INT
, x11_get_screen_number(ssh
->cfg
.x11_display
),
3882 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
3883 PKT_STR
, proto
, PKT_STR
, data
, PKT_END
);
3888 if (pktin
->type
!= SSH1_SMSG_SUCCESS
3889 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
3890 bombout(("Protocol confusion"));
3892 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3893 logevent("X11 forwarding refused");
3895 logevent("X11 forwarding enabled");
3896 ssh
->X11_fwd_enabled
= TRUE
;
3897 ssh
->packet_dispatch
[SSH1_SMSG_X11_OPEN
] = ssh1_smsg_x11_open
;
3904 int sport
,dport
,sserv
,dserv
;
3905 char sports
[256], dports
[256], saddr
[256], host
[256];
3907 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh1
);
3908 /* Add port forwardings. */
3909 ssh
->portfwd_strptr
= ssh
->cfg
.portfwd
;
3910 while (*ssh
->portfwd_strptr
) {
3911 type
= *ssh
->portfwd_strptr
++;
3914 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= '\t') {
3915 if (*ssh
->portfwd_strptr
== ':') {
3917 * We've seen a colon in the middle of the
3918 * source port number. This means that
3919 * everything we've seen until now is the
3920 * source _address_, so we'll move it into
3921 * saddr and start sports from the beginning
3924 ssh
->portfwd_strptr
++;
3926 strcpy(saddr
, sports
);
3929 if (n
< 255) sports
[n
++] = *ssh
->portfwd_strptr
++;
3933 if (*ssh
->portfwd_strptr
== '\t')
3934 ssh
->portfwd_strptr
++;
3936 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= ':') {
3937 if (n
< 255) host
[n
++] = *ssh
->portfwd_strptr
++;
3940 if (*ssh
->portfwd_strptr
== ':')
3941 ssh
->portfwd_strptr
++;
3943 while (*ssh
->portfwd_strptr
) {
3944 if (n
< 255) dports
[n
++] = *ssh
->portfwd_strptr
++;
3947 ssh
->portfwd_strptr
++;
3948 dport
= atoi(dports
);
3952 dport
= net_service_lookup(dports
);
3954 logeventf(ssh
, "Service lookup failed for"
3955 " destination port \"%s\"", dports
);
3959 while (*ssh
->portfwd_strptr
) ssh
->portfwd_strptr
++;
3961 ssh
->portfwd_strptr
++; /* eat the NUL and move to next one */
3963 sport
= atoi(sports
);
3967 sport
= net_service_lookup(sports
);
3969 logeventf(ssh
, "Service lookup failed for source"
3970 " port \"%s\"", sports
);
3973 if (sport
&& dport
) {
3974 /* Set up a description of the source port. */
3975 static char *sportdesc
;
3976 sportdesc
= dupprintf("%.*s%.*s%.*s%.*s%d%.*s",
3977 (int)(*saddr?
strlen(saddr
):0), *saddr?saddr
:NULL
,
3978 (int)(*saddr?
1:0), ":",
3979 (int)(sserv ?
strlen(sports
) : 0), sports
,
3980 sserv
, "(", sport
, sserv
, ")");
3982 /* Verbose description of the destination port */
3983 char *dportdesc
= dupprintf("%s:%.*s%.*s%d%.*s",
3985 (int)(dserv ?
strlen(dports
) : 0), dports
,
3986 dserv
, "(", dport
, dserv
, ")");
3987 const char *err
= pfd_addforward(host
, dport
,
3988 *saddr ? saddr
: NULL
,
3989 sport
, ssh
, &ssh
->cfg
);
3991 logeventf(ssh
, "Local port %s forward to %s"
3992 " failed: %s", sportdesc
, dportdesc
, err
);
3994 logeventf(ssh
, "Local port %s forwarding to %s",
3995 sportdesc
, dportdesc
);
3998 } else if (type
== 'D') {
3999 const char *err
= pfd_addforward(NULL
, -1,
4000 *saddr ? saddr
: NULL
,
4001 sport
, ssh
, &ssh
->cfg
);
4003 logeventf(ssh
, "Local port %s SOCKS dynamic forward"
4004 " setup failed: %s", sportdesc
, err
);
4006 logeventf(ssh
, "Local port %s doing SOCKS"
4007 " dynamic forwarding", sportdesc
);
4010 struct ssh_rportfwd
*pf
;
4011 pf
= snew(struct ssh_rportfwd
);
4012 strcpy(pf
->dhost
, host
);
4016 "SSH1 cannot handle source address spec \"%s:%d\"; ignoring",
4019 if (add234(ssh
->rportfwds
, pf
) != pf
) {
4021 "Duplicate remote port forwarding to %s:%d",
4025 logeventf(ssh
, "Requesting remote port %.*s%.*s%d%.*s"
4026 " forward to %s:%.*s%.*s%d%.*s",
4027 (int)(sserv ?
strlen(sports
) : 0), sports
,
4028 sserv
, "(", sport
, sserv
, ")",
4030 (int)(dserv ?
strlen(dports
) : 0), dports
,
4031 dserv
, "(", dport
, dserv
, ")");
4032 send_packet(ssh
, SSH1_CMSG_PORT_FORWARD_REQUEST
,
4040 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4041 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4042 bombout(("Protocol confusion"));
4044 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4045 c_write_str(ssh
, "Server refused port"
4047 logevent("Server refused this port forwarding");
4049 logevent("Remote port forwarding enabled");
4050 ssh
->packet_dispatch
[SSH1_MSG_PORT_OPEN
] =
4060 if (!ssh
->cfg
.nopty
) {
4061 /* Unpick the terminal-speed string. */
4062 /* XXX perhaps we should allow no speeds to be sent. */
4063 ssh
->ospeed
= 38400; ssh
->ispeed
= 38400; /* last-resort defaults */
4064 sscanf(ssh
->cfg
.termspeed
, "%d,%d", &ssh
->ospeed
, &ssh
->ispeed
);
4065 /* Send the pty request. */
4066 send_packet(ssh
, SSH1_CMSG_REQUEST_PTY
,
4067 PKT_STR
, ssh
->cfg
.termtype
,
4068 PKT_INT
, ssh
->term_height
,
4069 PKT_INT
, ssh
->term_width
,
4070 PKT_INT
, 0, PKT_INT
, 0, /* width,height in pixels */
4071 PKT_CHAR
, 192, PKT_INT
, ssh
->ispeed
, /* TTY_OP_ISPEED */
4072 PKT_CHAR
, 193, PKT_INT
, ssh
->ospeed
, /* TTY_OP_OSPEED */
4073 PKT_CHAR
, 0, PKT_END
);
4074 ssh
->state
= SSH_STATE_INTERMED
;
4078 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4079 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4080 bombout(("Protocol confusion"));
4082 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4083 c_write_str(ssh
, "Server refused to allocate pty\r\n");
4084 ssh
->editing
= ssh
->echoing
= 1;
4086 logeventf(ssh
, "Allocated pty (ospeed %dbps, ispeed %dbps)",
4087 ssh
->ospeed
, ssh
->ispeed
);
4089 ssh
->editing
= ssh
->echoing
= 1;
4092 if (ssh
->cfg
.compression
) {
4093 send_packet(ssh
, SSH1_CMSG_REQUEST_COMPRESSION
, PKT_INT
, 6, PKT_END
);
4097 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4098 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4099 bombout(("Protocol confusion"));
4101 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4102 c_write_str(ssh
, "Server refused to compress\r\n");
4104 logevent("Started compression");
4105 ssh
->v1_compressing
= TRUE
;
4106 ssh
->cs_comp_ctx
= zlib_compress_init();
4107 logevent("Initialised zlib (RFC1950) compression");
4108 ssh
->sc_comp_ctx
= zlib_decompress_init();
4109 logevent("Initialised zlib (RFC1950) decompression");
4113 * Start the shell or command.
4115 * Special case: if the first-choice command is an SSH2
4116 * subsystem (hence not usable here) and the second choice
4117 * exists, we fall straight back to that.
4120 char *cmd
= ssh
->cfg
.remote_cmd_ptr
;
4122 if (ssh
->cfg
.ssh_subsys
&& ssh
->cfg
.remote_cmd_ptr2
) {
4123 cmd
= ssh
->cfg
.remote_cmd_ptr2
;
4124 ssh
->fallback_cmd
= TRUE
;
4127 send_packet(ssh
, SSH1_CMSG_EXEC_CMD
, PKT_STR
, cmd
, PKT_END
);
4129 send_packet(ssh
, SSH1_CMSG_EXEC_SHELL
, PKT_END
);
4130 logevent("Started session");
4133 ssh
->state
= SSH_STATE_SESSION
;
4134 if (ssh
->size_needed
)
4135 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
4136 if (ssh
->eof_needed
)
4137 ssh_special(ssh
, TS_EOF
);
4140 ldisc_send(ssh
->ldisc
, NULL
, 0, 0);/* cause ldisc to notice changes */
4142 ssh
->channels
= newtree234(ssh_channelcmp
);
4146 * By this point, most incoming packets are already being
4147 * handled by the dispatch table, and we need only pay
4148 * attention to the unusual ones.
4153 if (pktin
->type
== SSH1_SMSG_SUCCESS
) {
4154 /* may be from EXEC_SHELL on some servers */
4155 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4156 /* may be from EXEC_SHELL on some servers
4157 * if no pty is available or in other odd cases. Ignore */
4159 bombout(("Strange packet received: type %d", pktin
->type
));
4164 int len
= min(inlen
, 512);
4165 send_packet(ssh
, SSH1_CMSG_STDIN_DATA
, PKTT_DATA
,
4166 PKT_INT
, len
, PKT_DATA
, in
, len
,
4167 PKTT_OTHER
, PKT_END
);
4178 * Handle the top-level SSH2 protocol.
4180 static void ssh1_msg_debug(Ssh ssh
, struct Packet
*pktin
)
4185 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
4186 buf
= dupprintf("Remote debug message: %.*s", msglen
, msg
);
4191 static void ssh1_msg_disconnect(Ssh ssh
, struct Packet
*pktin
)
4193 /* log reason code in disconnect message */
4197 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
4198 bombout(("Server sent disconnect message:\n\"%.*s\"", msglen
, msg
));
4201 void ssh_msg_ignore(Ssh ssh
, struct Packet
*pktin
)
4203 /* Do nothing, because we're ignoring it! Duhh. */
4206 static void ssh1_protocol_setup(Ssh ssh
)
4211 * Most messages are handled by the coroutines.
4213 for (i
= 0; i
< 256; i
++)
4214 ssh
->packet_dispatch
[i
] = NULL
;
4217 * These special message types we install handlers for.
4219 ssh
->packet_dispatch
[SSH1_MSG_DISCONNECT
] = ssh1_msg_disconnect
;
4220 ssh
->packet_dispatch
[SSH1_MSG_IGNORE
] = ssh_msg_ignore
;
4221 ssh
->packet_dispatch
[SSH1_MSG_DEBUG
] = ssh1_msg_debug
;
4224 static void ssh1_protocol(Ssh ssh
, unsigned char *in
, int inlen
,
4225 struct Packet
*pktin
)
4227 if (ssh
->state
== SSH_STATE_CLOSED
)
4230 if (pktin
&& ssh
->packet_dispatch
[pktin
->type
]) {
4231 ssh
->packet_dispatch
[pktin
->type
](ssh
, pktin
);
4235 if (!ssh
->protocol_initial_phase_done
) {
4236 if (do_ssh1_login(ssh
, in
, inlen
, pktin
))
4237 ssh
->protocol_initial_phase_done
= TRUE
;
4242 do_ssh1_connection(ssh
, in
, inlen
, pktin
);
4246 * Utility routine for decoding comma-separated strings in KEXINIT.
4248 static int in_commasep_string(char *needle
, char *haystack
, int haylen
)
4251 if (!needle
|| !haystack
) /* protect against null pointers */
4253 needlen
= strlen(needle
);
4256 * Is it at the start of the string?
4258 if (haylen
>= needlen
&& /* haystack is long enough */
4259 !memcmp(needle
, haystack
, needlen
) && /* initial match */
4260 (haylen
== needlen
|| haystack
[needlen
] == ',')
4261 /* either , or EOS follows */
4265 * If not, search for the next comma and resume after that.
4266 * If no comma found, terminate.
4268 while (haylen
> 0 && *haystack
!= ',')
4269 haylen
--, haystack
++;
4272 haylen
--, haystack
++; /* skip over comma itself */
4277 * SSH2 key creation method.
4279 static void ssh2_mkkey(Ssh ssh
, Bignum K
, unsigned char *H
,
4280 unsigned char *sessid
, char chr
,
4281 unsigned char *keyspace
)
4284 /* First 20 bytes. */
4286 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
4288 SHA_Bytes(&s
, H
, 20);
4289 SHA_Bytes(&s
, &chr
, 1);
4290 SHA_Bytes(&s
, sessid
, 20);
4291 SHA_Final(&s
, keyspace
);
4292 /* Next 20 bytes. */
4294 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
4296 SHA_Bytes(&s
, H
, 20);
4297 SHA_Bytes(&s
, keyspace
, 20);
4298 SHA_Final(&s
, keyspace
+ 20);
4302 * Handle the SSH2 transport layer.
4304 static int do_ssh2_transport(Ssh ssh
, unsigned char *in
, int inlen
,
4305 struct Packet
*pktin
)
4307 struct do_ssh2_transport_state
{
4308 int nbits
, pbits
, warn
;
4309 Bignum p
, g
, e
, f
, K
;
4310 int kex_init_value
, kex_reply_value
;
4311 const struct ssh_mac
**maclist
;
4313 const struct ssh2_cipher
*cscipher_tobe
;
4314 const struct ssh2_cipher
*sccipher_tobe
;
4315 const struct ssh_mac
*csmac_tobe
;
4316 const struct ssh_mac
*scmac_tobe
;
4317 const struct ssh_compress
*cscomp_tobe
;
4318 const struct ssh_compress
*sccomp_tobe
;
4319 char *hostkeydata
, *sigdata
, *keystr
, *fingerprint
;
4320 int hostkeylen
, siglen
;
4321 void *hkey
; /* actual host key */
4322 unsigned char exchange_hash
[20];
4323 int n_preferred_ciphers
;
4324 const struct ssh2_ciphers
*preferred_ciphers
[CIPHER_MAX
];
4325 const struct ssh_compress
*preferred_comp
;
4327 struct Packet
*pktout
;
4329 crState(do_ssh2_transport_state
);
4331 crBegin(ssh
->do_ssh2_transport_crstate
);
4333 s
->cscipher_tobe
= s
->sccipher_tobe
= NULL
;
4334 s
->csmac_tobe
= s
->scmac_tobe
= NULL
;
4335 s
->cscomp_tobe
= s
->sccomp_tobe
= NULL
;
4342 * Set up the preferred ciphers. (NULL => warn below here)
4344 s
->n_preferred_ciphers
= 0;
4345 for (i
= 0; i
< CIPHER_MAX
; i
++) {
4346 switch (ssh
->cfg
.ssh_cipherlist
[i
]) {
4347 case CIPHER_BLOWFISH
:
4348 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_blowfish
;
4351 if (ssh
->cfg
.ssh2_des_cbc
) {
4352 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_des
;
4356 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_3des
;
4359 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_aes
;
4362 /* Flag for later. Don't bother if it's the last in
4364 if (i
< CIPHER_MAX
- 1) {
4365 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = NULL
;
4373 * Set up preferred compression.
4375 if (ssh
->cfg
.compression
)
4376 s
->preferred_comp
= &ssh_zlib
;
4378 s
->preferred_comp
= &ssh_comp_none
;
4381 * Be prepared to work around the buggy MAC problem.
4383 if (ssh
->remote_bugs
& BUG_SSH2_HMAC
)
4384 s
->maclist
= buggymacs
, s
->nmacs
= lenof(buggymacs
);
4386 s
->maclist
= macs
, s
->nmacs
= lenof(macs
);
4390 int i
, j
, cipherstr_started
;
4393 * Enable queueing of outgoing auth- or connection-layer
4394 * packets while we are in the middle of a key exchange.
4396 ssh
->queueing
= TRUE
;
4399 * Flag that KEX is in progress.
4401 ssh
->kex_in_progress
= TRUE
;
4404 * Construct and send our key exchange packet.
4406 s
->pktout
= ssh2_pkt_init(SSH2_MSG_KEXINIT
);
4407 for (i
= 0; i
< 16; i
++)
4408 ssh2_pkt_addbyte(s
->pktout
, (unsigned char) random_byte());
4409 /* List key exchange algorithms. */
4410 ssh2_pkt_addstring_start(s
->pktout
);
4411 for (i
= 0; i
< lenof(kex_algs
); i
++) {
4412 if (kex_algs
[i
] == &ssh_diffiehellman_gex
&&
4413 (ssh
->remote_bugs
& BUG_SSH2_DH_GEX
))
4415 ssh2_pkt_addstring_str(s
->pktout
, kex_algs
[i
]->name
);
4416 if (i
< lenof(kex_algs
) - 1)
4417 ssh2_pkt_addstring_str(s
->pktout
, ",");
4419 /* List server host key algorithms. */
4420 ssh2_pkt_addstring_start(s
->pktout
);
4421 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
4422 ssh2_pkt_addstring_str(s
->pktout
, hostkey_algs
[i
]->name
);
4423 if (i
< lenof(hostkey_algs
) - 1)
4424 ssh2_pkt_addstring_str(s
->pktout
, ",");
4426 /* List client->server encryption algorithms. */
4427 ssh2_pkt_addstring_start(s
->pktout
);
4428 cipherstr_started
= 0;
4429 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4430 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4431 if (!c
) continue; /* warning flag */
4432 for (j
= 0; j
< c
->nciphers
; j
++) {
4433 if (cipherstr_started
)
4434 ssh2_pkt_addstring_str(s
->pktout
, ",");
4435 ssh2_pkt_addstring_str(s
->pktout
, c
->list
[j
]->name
);
4436 cipherstr_started
= 1;
4439 /* List server->client encryption algorithms. */
4440 ssh2_pkt_addstring_start(s
->pktout
);
4441 cipherstr_started
= 0;
4442 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4443 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4444 if (!c
) continue; /* warning flag */
4445 for (j
= 0; j
< c
->nciphers
; j
++) {
4446 if (cipherstr_started
)
4447 ssh2_pkt_addstring_str(s
->pktout
, ",");
4448 ssh2_pkt_addstring_str(s
->pktout
, c
->list
[j
]->name
);
4449 cipherstr_started
= 1;
4452 /* List client->server MAC algorithms. */
4453 ssh2_pkt_addstring_start(s
->pktout
);
4454 for (i
= 0; i
< s
->nmacs
; i
++) {
4455 ssh2_pkt_addstring_str(s
->pktout
, s
->maclist
[i
]->name
);
4456 if (i
< s
->nmacs
- 1)
4457 ssh2_pkt_addstring_str(s
->pktout
, ",");
4459 /* List server->client MAC algorithms. */
4460 ssh2_pkt_addstring_start(s
->pktout
);
4461 for (i
= 0; i
< s
->nmacs
; i
++) {
4462 ssh2_pkt_addstring_str(s
->pktout
, s
->maclist
[i
]->name
);
4463 if (i
< s
->nmacs
- 1)
4464 ssh2_pkt_addstring_str(s
->pktout
, ",");
4466 /* List client->server compression algorithms. */
4467 ssh2_pkt_addstring_start(s
->pktout
);
4468 assert(lenof(compressions
) > 1);
4469 ssh2_pkt_addstring_str(s
->pktout
, s
->preferred_comp
->name
);
4470 for (i
= 0; i
< lenof(compressions
); i
++) {
4471 const struct ssh_compress
*c
= compressions
[i
];
4472 if (c
!= s
->preferred_comp
) {
4473 ssh2_pkt_addstring_str(s
->pktout
, ",");
4474 ssh2_pkt_addstring_str(s
->pktout
, c
->name
);
4477 /* List server->client compression algorithms. */
4478 ssh2_pkt_addstring_start(s
->pktout
);
4479 assert(lenof(compressions
) > 1);
4480 ssh2_pkt_addstring_str(s
->pktout
, s
->preferred_comp
->name
);
4481 for (i
= 0; i
< lenof(compressions
); i
++) {
4482 const struct ssh_compress
*c
= compressions
[i
];
4483 if (c
!= s
->preferred_comp
) {
4484 ssh2_pkt_addstring_str(s
->pktout
, ",");
4485 ssh2_pkt_addstring_str(s
->pktout
, c
->name
);
4488 /* List client->server languages. Empty list. */
4489 ssh2_pkt_addstring_start(s
->pktout
);
4490 /* List server->client languages. Empty list. */
4491 ssh2_pkt_addstring_start(s
->pktout
);
4492 /* First KEX packet does _not_ follow, because we're not that brave. */
4493 ssh2_pkt_addbool(s
->pktout
, FALSE
);
4495 ssh2_pkt_adduint32(s
->pktout
, 0);
4498 ssh
->exhash
= ssh
->exhashbase
;
4499 sha_string(&ssh
->exhash
, s
->pktout
->data
+ 5, s
->pktout
->length
- 5);
4501 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
4505 if (pktin
->length
> 5)
4506 sha_string(&ssh
->exhash
, pktin
->data
+ 5, pktin
->length
- 5);
4509 * Now examine the other side's KEXINIT to see what we're up
4516 if (pktin
->type
!= SSH2_MSG_KEXINIT
) {
4517 bombout(("expected key exchange packet from server"));
4521 ssh
->hostkey
= NULL
;
4522 s
->cscipher_tobe
= NULL
;
4523 s
->sccipher_tobe
= NULL
;
4524 s
->csmac_tobe
= NULL
;
4525 s
->scmac_tobe
= NULL
;
4526 s
->cscomp_tobe
= NULL
;
4527 s
->sccomp_tobe
= NULL
;
4528 pktin
->savedpos
+= 16; /* skip garbage cookie */
4529 ssh_pkt_getstring(pktin
, &str
, &len
); /* key exchange algorithms */
4530 for (i
= 0; i
< lenof(kex_algs
); i
++) {
4531 if (kex_algs
[i
] == &ssh_diffiehellman_gex
&&
4532 (ssh
->remote_bugs
& BUG_SSH2_DH_GEX
))
4534 if (in_commasep_string(kex_algs
[i
]->name
, str
, len
)) {
4535 ssh
->kex
= kex_algs
[i
];
4539 ssh_pkt_getstring(pktin
, &str
, &len
); /* host key algorithms */
4540 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
4541 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
4542 ssh
->hostkey
= hostkey_algs
[i
];
4546 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server cipher */
4548 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4549 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4553 for (j
= 0; j
< c
->nciphers
; j
++) {
4554 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
4555 s
->cscipher_tobe
= c
->list
[j
];
4560 if (s
->cscipher_tobe
) {
4562 askcipher(ssh
->frontend
, s
->cscipher_tobe
->name
, 1);
4566 if (!s
->cscipher_tobe
) {
4567 bombout(("Couldn't agree a client-to-server cipher (available: %s)",
4568 str ? str
: "(null)"));
4572 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client cipher */
4574 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4575 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4579 for (j
= 0; j
< c
->nciphers
; j
++) {
4580 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
4581 s
->sccipher_tobe
= c
->list
[j
];
4586 if (s
->sccipher_tobe
) {
4588 askcipher(ssh
->frontend
, s
->sccipher_tobe
->name
, 2);
4592 if (!s
->sccipher_tobe
) {
4593 bombout(("Couldn't agree a server-to-client cipher (available: %s)",
4594 str ? str
: "(null)"));
4598 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server mac */
4599 for (i
= 0; i
< s
->nmacs
; i
++) {
4600 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
4601 s
->csmac_tobe
= s
->maclist
[i
];
4605 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client mac */
4606 for (i
= 0; i
< s
->nmacs
; i
++) {
4607 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
4608 s
->scmac_tobe
= s
->maclist
[i
];
4612 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server compression */
4613 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
4614 const struct ssh_compress
*c
=
4615 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
4616 if (in_commasep_string(c
->name
, str
, len
)) {
4621 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client compression */
4622 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
4623 const struct ssh_compress
*c
=
4624 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
4625 if (in_commasep_string(c
->name
, str
, len
)) {
4633 * Work out the number of bits of key we will need from the key
4634 * exchange. We start with the maximum key length of either
4640 csbits
= s
->cscipher_tobe
->keylen
;
4641 scbits
= s
->sccipher_tobe
->keylen
;
4642 s
->nbits
= (csbits
> scbits ? csbits
: scbits
);
4644 /* The keys only have 160-bit entropy, since they're based on
4645 * a SHA-1 hash. So cap the key size at 160 bits. */
4650 * If we're doing Diffie-Hellman group exchange, start by
4651 * requesting a group.
4653 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
4654 logevent("Doing Diffie-Hellman group exchange");
4655 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGEX
;
4657 * Work out how big a DH group we will need to allow that
4660 s
->pbits
= 512 << ((s
->nbits
- 1) / 64);
4661 s
->pktout
= ssh2_pkt_init(SSH2_MSG_KEX_DH_GEX_REQUEST
);
4662 ssh2_pkt_adduint32(s
->pktout
, s
->pbits
);
4663 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
4666 if (pktin
->type
!= SSH2_MSG_KEX_DH_GEX_GROUP
) {
4667 bombout(("expected key exchange group packet from server"));
4670 s
->p
= ssh2_pkt_getmp(pktin
);
4671 s
->g
= ssh2_pkt_getmp(pktin
);
4672 if (!s
->p
|| !s
->g
) {
4673 bombout(("unable to read mp-ints from incoming group packet"));
4676 ssh
->kex_ctx
= dh_setup_group(s
->p
, s
->g
);
4677 s
->kex_init_value
= SSH2_MSG_KEX_DH_GEX_INIT
;
4678 s
->kex_reply_value
= SSH2_MSG_KEX_DH_GEX_REPLY
;
4680 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGROUP1
;
4681 ssh
->kex_ctx
= dh_setup_group1();
4682 s
->kex_init_value
= SSH2_MSG_KEXDH_INIT
;
4683 s
->kex_reply_value
= SSH2_MSG_KEXDH_REPLY
;
4686 logevent("Doing Diffie-Hellman key exchange");
4688 * Now generate and send e for Diffie-Hellman.
4690 s
->e
= dh_create_e(ssh
->kex_ctx
, s
->nbits
* 2);
4691 s
->pktout
= ssh2_pkt_init(s
->kex_init_value
);
4692 ssh2_pkt_addmp(s
->pktout
, s
->e
);
4693 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
4696 if (pktin
->type
!= s
->kex_reply_value
) {
4697 bombout(("expected key exchange reply packet from server"));
4700 ssh_pkt_getstring(pktin
, &s
->hostkeydata
, &s
->hostkeylen
);
4701 s
->f
= ssh2_pkt_getmp(pktin
);
4703 bombout(("unable to parse key exchange reply packet"));
4706 ssh_pkt_getstring(pktin
, &s
->sigdata
, &s
->siglen
);
4708 s
->K
= dh_find_K(ssh
->kex_ctx
, s
->f
);
4710 sha_string(&ssh
->exhash
, s
->hostkeydata
, s
->hostkeylen
);
4711 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
4712 sha_uint32(&ssh
->exhash
, s
->pbits
);
4713 sha_mpint(&ssh
->exhash
, s
->p
);
4714 sha_mpint(&ssh
->exhash
, s
->g
);
4716 sha_mpint(&ssh
->exhash
, s
->e
);
4717 sha_mpint(&ssh
->exhash
, s
->f
);
4718 sha_mpint(&ssh
->exhash
, s
->K
);
4719 SHA_Final(&ssh
->exhash
, s
->exchange_hash
);
4721 dh_cleanup(ssh
->kex_ctx
);
4722 ssh
->kex_ctx
= NULL
;
4725 debug(("Exchange hash is:\n"));
4726 dmemdump(s
->exchange_hash
, 20);
4729 s
->hkey
= ssh
->hostkey
->newkey(s
->hostkeydata
, s
->hostkeylen
);
4731 !ssh
->hostkey
->verifysig(s
->hkey
, s
->sigdata
, s
->siglen
,
4732 (char *)s
->exchange_hash
, 20)) {
4733 bombout(("Server's host key did not match the signature supplied"));
4738 * Authenticate remote host: verify host key. (We've already
4739 * checked the signature of the exchange hash.)
4741 s
->keystr
= ssh
->hostkey
->fmtkey(s
->hkey
);
4742 s
->fingerprint
= ssh
->hostkey
->fingerprint(s
->hkey
);
4743 verify_ssh_host_key(ssh
->frontend
,
4744 ssh
->savedhost
, ssh
->savedport
, ssh
->hostkey
->keytype
,
4745 s
->keystr
, s
->fingerprint
);
4746 if (s
->first_kex
) { /* don't bother logging this in rekeys */
4747 logevent("Host key fingerprint is:");
4748 logevent(s
->fingerprint
);
4750 sfree(s
->fingerprint
);
4752 ssh
->hostkey
->freekey(s
->hkey
);
4755 * The exchange hash from the very first key exchange is also
4756 * the session id, used in session key construction and
4760 memcpy(ssh
->v2_session_id
, s
->exchange_hash
,
4761 sizeof(s
->exchange_hash
));
4764 * Send SSH2_MSG_NEWKEYS.
4766 s
->pktout
= ssh2_pkt_init(SSH2_MSG_NEWKEYS
);
4767 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
4768 ssh
->outgoing_data_size
= 0; /* start counting from here */
4771 * We've sent client NEWKEYS, so create and initialise
4772 * client-to-server session keys.
4774 if (ssh
->cs_cipher_ctx
)
4775 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
4776 ssh
->cscipher
= s
->cscipher_tobe
;
4777 ssh
->cs_cipher_ctx
= ssh
->cscipher
->make_context();
4779 if (ssh
->cs_mac_ctx
)
4780 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
4781 ssh
->csmac
= s
->csmac_tobe
;
4782 ssh
->cs_mac_ctx
= ssh
->csmac
->make_context();
4784 if (ssh
->cs_comp_ctx
)
4785 ssh
->cscomp
->compress_cleanup(ssh
->cs_comp_ctx
);
4786 ssh
->cscomp
= s
->cscomp_tobe
;
4787 ssh
->cs_comp_ctx
= ssh
->cscomp
->compress_init();
4790 * Set IVs on client-to-server keys. Here we use the exchange
4791 * hash from the _first_ key exchange.
4794 unsigned char keyspace
[40];
4795 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'C',keyspace
);
4796 ssh
->cscipher
->setkey(ssh
->cs_cipher_ctx
, keyspace
);
4797 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'A',keyspace
);
4798 ssh
->cscipher
->setiv(ssh
->cs_cipher_ctx
, keyspace
);
4799 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'E',keyspace
);
4800 ssh
->csmac
->setkey(ssh
->cs_mac_ctx
, keyspace
);
4803 logeventf(ssh
, "Initialised %.200s client->server encryption",
4804 ssh
->cscipher
->text_name
);
4805 logeventf(ssh
, "Initialised %.200s client->server MAC algorithm",
4806 ssh
->csmac
->text_name
);
4807 if (ssh
->cscomp
->text_name
)
4808 logeventf(ssh
, "Initialised %s compression",
4809 ssh
->cscomp
->text_name
);
4812 * Now our end of the key exchange is complete, we can send all
4813 * our queued higher-layer packets.
4815 ssh
->queueing
= FALSE
;
4816 ssh2_pkt_queuesend(ssh
);
4819 * Expect SSH2_MSG_NEWKEYS from server.
4822 if (pktin
->type
!= SSH2_MSG_NEWKEYS
) {
4823 bombout(("expected new-keys packet from server"));
4826 ssh
->incoming_data_size
= 0; /* start counting from here */
4829 * We've seen server NEWKEYS, so create and initialise
4830 * server-to-client session keys.
4832 if (ssh
->sc_cipher_ctx
)
4833 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
4834 ssh
->sccipher
= s
->sccipher_tobe
;
4835 ssh
->sc_cipher_ctx
= ssh
->sccipher
->make_context();
4837 if (ssh
->sc_mac_ctx
)
4838 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
4839 ssh
->scmac
= s
->scmac_tobe
;
4840 ssh
->sc_mac_ctx
= ssh
->scmac
->make_context();
4842 if (ssh
->sc_comp_ctx
)
4843 ssh
->sccomp
->decompress_cleanup(ssh
->sc_comp_ctx
);
4844 ssh
->sccomp
= s
->sccomp_tobe
;
4845 ssh
->sc_comp_ctx
= ssh
->sccomp
->decompress_init();
4848 * Set IVs on server-to-client keys. Here we use the exchange
4849 * hash from the _first_ key exchange.
4852 unsigned char keyspace
[40];
4853 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'D',keyspace
);
4854 ssh
->sccipher
->setkey(ssh
->sc_cipher_ctx
, keyspace
);
4855 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'B',keyspace
);
4856 ssh
->sccipher
->setiv(ssh
->sc_cipher_ctx
, keyspace
);
4857 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'F',keyspace
);
4858 ssh
->scmac
->setkey(ssh
->sc_mac_ctx
, keyspace
);
4860 logeventf(ssh
, "Initialised %.200s server->client encryption",
4861 ssh
->sccipher
->text_name
);
4862 logeventf(ssh
, "Initialised %.200s server->client MAC algorithm",
4863 ssh
->scmac
->text_name
);
4864 if (ssh
->sccomp
->text_name
)
4865 logeventf(ssh
, "Initialised %s decompression",
4866 ssh
->sccomp
->text_name
);
4869 * Free key exchange data.
4873 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
4879 * Key exchange is over. Schedule a timer for our next rekey.
4881 ssh
->kex_in_progress
= FALSE
;
4882 ssh
->next_rekey
= schedule_timer(REKEY_TIMEOUT
, ssh2_timer
, ssh
);
4885 * If this is the first key exchange phase, we must pass the
4886 * SSH2_MSG_NEWKEYS packet to the next layer, not because it
4887 * wants to see it but because it will need time to initialise
4888 * itself before it sees an actual packet. In subsequent key
4889 * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because
4890 * it would only confuse the layer above.
4892 if (!s
->first_kex
) {
4898 * Now we're encrypting. Begin returning 1 to the protocol main
4899 * function so that other things can run on top of the
4900 * transport. If we ever see a KEXINIT, we must go back to the
4903 * We _also_ go back to the start if we see pktin==NULL and
4904 * inlen==-1, because this is a special signal meaning
4905 * `initiate client-driven rekey', and `in' contains a message
4906 * giving the reason for the rekey.
4908 while (!((pktin
&& pktin
->type
== SSH2_MSG_KEXINIT
) ||
4909 (!pktin
&& inlen
== -1))) {
4913 logevent("Server initiated key re-exchange");
4915 logevent((char *)in
);
4917 goto begin_key_exchange
;
4923 * Add data to an SSH2 channel output buffer.
4925 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
,
4928 bufchain_add(&c
->v
.v2
.outbuffer
, buf
, len
);
4932 * Attempt to send data on an SSH2 channel.
4934 static int ssh2_try_send(struct ssh_channel
*c
)
4937 struct Packet
*pktout
;
4939 while (c
->v
.v2
.remwindow
> 0 && bufchain_size(&c
->v
.v2
.outbuffer
) > 0) {
4942 bufchain_prefix(&c
->v
.v2
.outbuffer
, &data
, &len
);
4943 if ((unsigned)len
> c
->v
.v2
.remwindow
)
4944 len
= c
->v
.v2
.remwindow
;
4945 if ((unsigned)len
> c
->v
.v2
.remmaxpkt
)
4946 len
= c
->v
.v2
.remmaxpkt
;
4947 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA
);
4948 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
4949 dont_log_data(ssh
, pktout
, PKTLOG_OMIT
);
4950 ssh2_pkt_addstring_start(pktout
);
4951 ssh2_pkt_addstring_data(pktout
, data
, len
);
4952 end_log_omission(ssh
, pktout
);
4953 ssh2_pkt_send(ssh
, pktout
);
4954 bufchain_consume(&c
->v
.v2
.outbuffer
, len
);
4955 c
->v
.v2
.remwindow
-= len
;
4959 * After having sent as much data as we can, return the amount
4962 return bufchain_size(&c
->v
.v2
.outbuffer
);
4966 * Potentially enlarge the window on an SSH2 channel.
4968 static void ssh2_set_window(struct ssh_channel
*c
, unsigned newwin
)
4973 * Never send WINDOW_ADJUST for a channel that the remote side
4974 * already thinks it's closed; there's no point, since it won't
4975 * be sending any more data anyway.
4980 if (newwin
> c
->v
.v2
.locwindow
) {
4981 struct Packet
*pktout
;
4983 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
4984 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
4985 ssh2_pkt_adduint32(pktout
, newwin
- c
->v
.v2
.locwindow
);
4986 ssh2_pkt_send(ssh
, pktout
);
4987 c
->v
.v2
.locwindow
= newwin
;
4991 static void ssh2_msg_channel_window_adjust(Ssh ssh
, struct Packet
*pktin
)
4993 unsigned i
= ssh_pkt_getuint32(pktin
);
4994 struct ssh_channel
*c
;
4995 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
4996 if (c
&& !c
->closes
)
4997 c
->v
.v2
.remwindow
+= ssh_pkt_getuint32(pktin
);
5000 static void ssh2_msg_channel_data(Ssh ssh
, struct Packet
*pktin
)
5004 unsigned i
= ssh_pkt_getuint32(pktin
);
5005 struct ssh_channel
*c
;
5006 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5008 return; /* nonexistent channel */
5009 if (pktin
->type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
&&
5010 ssh_pkt_getuint32(pktin
) != SSH2_EXTENDED_DATA_STDERR
)
5011 return; /* extended but not stderr */
5012 ssh_pkt_getstring(pktin
, &data
, &length
);
5015 c
->v
.v2
.locwindow
-= length
;
5017 case CHAN_MAINSESSION
:
5019 from_backend(ssh
->frontend
, pktin
->type
==
5020 SSH2_MSG_CHANNEL_EXTENDED_DATA
,
5024 bufsize
= x11_send(c
->u
.x11
.s
, data
, length
);
5027 bufsize
= pfd_send(c
->u
.pfd
.s
, data
, length
);
5030 while (length
> 0) {
5031 if (c
->u
.a
.lensofar
< 4) {
5032 int l
= min(4 - c
->u
.a
.lensofar
, length
);
5033 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
,
5037 c
->u
.a
.lensofar
+= l
;
5039 if (c
->u
.a
.lensofar
== 4) {
5041 4 + GET_32BIT(c
->u
.a
.msglen
);
5042 c
->u
.a
.message
= snewn(c
->u
.a
.totallen
,
5044 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
5046 if (c
->u
.a
.lensofar
>= 4 && length
> 0) {
5048 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
5050 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
,
5054 c
->u
.a
.lensofar
+= l
;
5056 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
5059 if (agent_query(c
->u
.a
.message
,
5062 ssh_agentf_callback
, c
))
5063 ssh_agentf_callback(c
, reply
, replylen
);
5064 sfree(c
->u
.a
.message
);
5065 c
->u
.a
.lensofar
= 0;
5072 * If we are not buffering too much data,
5073 * enlarge the window again at the remote side.
5075 if (bufsize
< OUR_V2_WINSIZE
)
5076 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
5080 static void ssh2_msg_channel_eof(Ssh ssh
, struct Packet
*pktin
)
5082 unsigned i
= ssh_pkt_getuint32(pktin
);
5083 struct ssh_channel
*c
;
5085 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5087 return; /* nonexistent channel */
5089 if (c
->type
== CHAN_X11
) {
5091 * Remote EOF on an X11 channel means we should
5092 * wrap up and close the channel ourselves.
5094 x11_close(c
->u
.x11
.s
);
5096 } else if (c
->type
== CHAN_AGENT
) {
5098 } else if (c
->type
== CHAN_SOCKDATA
) {
5099 pfd_close(c
->u
.pfd
.s
);
5104 static void ssh2_msg_channel_close(Ssh ssh
, struct Packet
*pktin
)
5106 unsigned i
= ssh_pkt_getuint32(pktin
);
5107 struct ssh_channel
*c
;
5108 struct Packet
*pktout
;
5110 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5111 if (!c
|| ((int)c
->remoteid
) == -1) {
5112 bombout(("Received CHANNEL_CLOSE for %s channel %d\n",
5113 c ?
"half-open" : "nonexistent", i
));
5116 /* Do pre-close processing on the channel. */
5118 case CHAN_MAINSESSION
:
5119 ssh
->mainchan
= NULL
;
5120 update_specials_menu(ssh
->frontend
);
5123 if (c
->u
.x11
.s
!= NULL
)
5124 x11_close(c
->u
.x11
.s
);
5131 if (c
->u
.pfd
.s
!= NULL
)
5132 pfd_close(c
->u
.pfd
.s
);
5136 if (c
->closes
== 0) {
5137 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
5138 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5139 ssh2_pkt_send(ssh
, pktout
);
5141 del234(ssh
->channels
, c
);
5142 bufchain_clear(&c
->v
.v2
.outbuffer
);
5146 * See if that was the last channel left open.
5147 * (This is only our termination condition if we're
5148 * not running in -N mode.)
5150 if (!ssh
->cfg
.ssh_no_shell
&& count234(ssh
->channels
) == 0) {
5151 logevent("All channels closed. Disconnecting");
5154 * We used to send SSH_MSG_DISCONNECT here,
5155 * because I'd believed that _every_ conforming
5156 * SSH2 connection had to end with a disconnect
5157 * being sent by at least one side; apparently
5158 * I was wrong and it's perfectly OK to
5159 * unceremoniously slam the connection shut
5160 * when you're done, and indeed OpenSSH feels
5161 * this is more polite than sending a
5162 * DISCONNECT. So now we don't.
5164 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
5165 ssh2_pkt_adduint32(s
->pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
5166 ssh2_pkt_addstring(s
->pktout
, "All open channels closed");
5167 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
5168 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5170 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5174 static void ssh2_msg_channel_open_confirmation(Ssh ssh
, struct Packet
*pktin
)
5176 unsigned i
= ssh_pkt_getuint32(pktin
);
5177 struct ssh_channel
*c
;
5178 struct Packet
*pktout
;
5180 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5182 return; /* nonexistent channel */
5183 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
5184 return; /* dunno why they're confirming this */
5185 c
->remoteid
= ssh_pkt_getuint32(pktin
);
5186 c
->type
= CHAN_SOCKDATA
;
5187 c
->v
.v2
.remwindow
= ssh_pkt_getuint32(pktin
);
5188 c
->v
.v2
.remmaxpkt
= ssh_pkt_getuint32(pktin
);
5190 pfd_confirm(c
->u
.pfd
.s
);
5193 * We have a pending close on this channel,
5194 * which we decided on before the server acked
5195 * the channel open. So now we know the
5196 * remoteid, we can close it again.
5198 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
5199 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5200 ssh2_pkt_send(ssh
, pktout
);
5204 static void ssh2_msg_channel_open_failure(Ssh ssh
, struct Packet
*pktin
)
5206 static const char *const reasons
[] = {
5207 "<unknown reason code>",
5208 "Administratively prohibited",
5210 "Unknown channel type",
5211 "Resource shortage",
5213 unsigned i
= ssh_pkt_getuint32(pktin
);
5214 unsigned reason_code
;
5215 char *reason_string
;
5218 struct ssh_channel
*c
;
5219 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5221 return; /* nonexistent channel */
5222 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
5223 return; /* dunno why they're failing this */
5225 reason_code
= ssh_pkt_getuint32(pktin
);
5226 if (reason_code
>= lenof(reasons
))
5227 reason_code
= 0; /* ensure reasons[reason_code] in range */
5228 ssh_pkt_getstring(pktin
, &reason_string
, &reason_length
);
5229 message
= dupprintf("Forwarded connection refused by"
5230 " server: %s [%.*s]", reasons
[reason_code
],
5231 reason_length
, reason_string
);
5235 pfd_close(c
->u
.pfd
.s
);
5237 del234(ssh
->channels
, c
);
5241 static void ssh2_msg_channel_request(Ssh ssh
, struct Packet
*pktin
)
5245 int typelen
, want_reply
;
5246 int reply
= SSH2_MSG_CHANNEL_FAILURE
; /* default */
5247 struct ssh_channel
*c
;
5248 struct Packet
*pktout
;
5250 localid
= ssh_pkt_getuint32(pktin
);
5251 ssh_pkt_getstring(pktin
, &type
, &typelen
);
5252 want_reply
= ssh2_pkt_getbool(pktin
);
5255 * First, check that the channel exists. Otherwise,
5256 * we can instantly disconnect with a rude message.
5258 c
= find234(ssh
->channels
, &localid
, ssh_channelfind
);
5261 sprintf(buf
, "Received channel request for nonexistent"
5262 " channel %d", localid
);
5264 pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
5265 ssh2_pkt_adduint32(pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
5266 ssh2_pkt_addstring(pktout
, buf
);
5267 ssh2_pkt_addstring(pktout
, "en"); /* language tag */
5268 ssh2_pkt_send_noqueue(ssh
, pktout
);
5269 connection_fatal(ssh
->frontend
, "%s", buf
);
5270 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5275 * Having got the channel number, we now look at
5276 * the request type string to see if it's something
5279 if (c
== ssh
->mainchan
) {
5281 * We recognise "exit-status" and "exit-signal" on
5282 * the primary channel.
5284 if (typelen
== 11 &&
5285 !memcmp(type
, "exit-status", 11)) {
5287 ssh
->exitcode
= ssh_pkt_getuint32(pktin
);
5288 logeventf(ssh
, "Server sent command exit status %d",
5290 reply
= SSH2_MSG_CHANNEL_SUCCESS
;
5292 } else if (typelen
== 11 &&
5293 !memcmp(type
, "exit-signal", 11)) {
5295 int is_plausible
= TRUE
, is_int
= FALSE
;
5296 char *fmt_sig
= "", *fmt_msg
= "";
5298 int msglen
= 0, core
= FALSE
;
5299 /* ICK: older versions of OpenSSH (e.g. 3.4p1)
5300 * provide an `int' for the signal, despite its
5301 * having been a `string' in the drafts since at
5302 * least 2001. (Fixed in session.c 1.147.) Try to
5303 * infer which we can safely parse it as. */
5305 unsigned char *p
= pktin
->body
+
5307 long len
= pktin
->length
- pktin
->savedpos
;
5308 unsigned long num
= GET_32BIT(p
); /* what is it? */
5309 /* If it's 0, it hardly matters; assume string */
5313 int maybe_int
= FALSE
, maybe_str
= FALSE
;
5314 #define CHECK_HYPOTHESIS(offset, result) \
5317 if (q >= 0 && q+4 <= len) { \
5318 q = q + 4 + GET_32BIT(p+q); \
5319 if (q >= 0 && q+4 <= len && \
5320 (q = q + 4 + GET_32BIT(p+q)) && q == len) \
5324 CHECK_HYPOTHESIS(4+1, maybe_int
);
5325 CHECK_HYPOTHESIS(4+num
+1, maybe_str
);
5326 #undef CHECK_HYPOTHESIS
5327 if (maybe_int
&& !maybe_str
)
5329 else if (!maybe_int
&& maybe_str
)
5332 /* Crikey. Either or neither. Panic. */
5333 is_plausible
= FALSE
;
5338 /* Old non-standard OpenSSH. */
5339 int signum
= ssh_pkt_getuint32(pktin
);
5340 fmt_sig
= dupprintf(" %d", signum
);
5342 /* As per the drafts. */
5345 ssh_pkt_getstring(pktin
, &sig
, &siglen
);
5346 /* Signal name isn't supposed to be blank, but
5347 * let's cope gracefully if it is. */
5349 fmt_sig
= dupprintf(" \"%.*s\"",
5353 core
= ssh2_pkt_getbool(pktin
);
5354 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
5356 fmt_msg
= dupprintf(" (\"%.*s\")", msglen
, msg
);
5358 /* ignore lang tag */
5359 } /* else don't attempt to parse */
5360 logeventf(ssh
, "Server exited on signal%s%s%s",
5361 fmt_sig
, core ?
" (core dumped)" : "",
5363 if (*fmt_sig
) sfree(fmt_sig
);
5364 if (*fmt_msg
) sfree(fmt_msg
);
5365 reply
= SSH2_MSG_CHANNEL_SUCCESS
;
5370 * This is a channel request we don't know
5371 * about, so we now either ignore the request
5372 * or respond with CHANNEL_FAILURE, depending
5375 reply
= SSH2_MSG_CHANNEL_FAILURE
;
5378 pktout
= ssh2_pkt_init(reply
);
5379 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5380 ssh2_pkt_send(ssh
, pktout
);
5384 static void ssh2_msg_global_request(Ssh ssh
, struct Packet
*pktin
)
5387 int typelen
, want_reply
;
5388 struct Packet
*pktout
;
5390 ssh_pkt_getstring(pktin
, &type
, &typelen
);
5391 want_reply
= ssh2_pkt_getbool(pktin
);
5394 * We currently don't support any global requests
5395 * at all, so we either ignore the request or
5396 * respond with REQUEST_FAILURE, depending on
5400 pktout
= ssh2_pkt_init(SSH2_MSG_REQUEST_FAILURE
);
5401 ssh2_pkt_send(ssh
, pktout
);
5405 static void ssh2_msg_channel_open(Ssh ssh
, struct Packet
*pktin
)
5413 struct ssh_channel
*c
;
5414 unsigned remid
, winsize
, pktsize
;
5415 struct Packet
*pktout
;
5417 ssh_pkt_getstring(pktin
, &type
, &typelen
);
5418 c
= snew(struct ssh_channel
);
5421 remid
= ssh_pkt_getuint32(pktin
);
5422 winsize
= ssh_pkt_getuint32(pktin
);
5423 pktsize
= ssh_pkt_getuint32(pktin
);
5425 if (typelen
== 3 && !memcmp(type
, "x11", 3)) {
5428 ssh_pkt_getstring(pktin
, &peeraddr
, &peeraddrlen
);
5429 addrstr
= snewn(peeraddrlen
+1, char);
5430 memcpy(addrstr
, peeraddr
, peeraddrlen
);
5431 addrstr
[peeraddrlen
] = '\0';
5432 peerport
= ssh_pkt_getuint32(pktin
);
5434 logeventf(ssh
, "Received X11 connect request from %s:%d",
5437 if (!ssh
->X11_fwd_enabled
)
5438 error
= "X11 forwarding is not enabled";
5439 else if (x11_init(&c
->u
.x11
.s
, ssh
->cfg
.x11_display
, c
,
5440 ssh
->x11auth
, addrstr
, peerport
,
5441 &ssh
->cfg
) != NULL
) {
5442 error
= "Unable to open an X11 connection";
5444 logevent("Opening X11 forward connection succeeded");
5449 } else if (typelen
== 15 &&
5450 !memcmp(type
, "forwarded-tcpip", 15)) {
5451 struct ssh_rportfwd pf
, *realpf
;
5454 ssh_pkt_getstring(pktin
, &dummy
, &dummylen
);/* skip address */
5455 pf
.sport
= ssh_pkt_getuint32(pktin
);
5456 ssh_pkt_getstring(pktin
, &peeraddr
, &peeraddrlen
);
5457 peerport
= ssh_pkt_getuint32(pktin
);
5458 realpf
= find234(ssh
->rportfwds
, &pf
, NULL
);
5459 logeventf(ssh
, "Received remote port %d open request "
5460 "from %s:%d", pf
.sport
, peeraddr
, peerport
);
5461 if (realpf
== NULL
) {
5462 error
= "Remote port is not recognised";
5464 const char *e
= pfd_newconnect(&c
->u
.pfd
.s
,
5468 logeventf(ssh
, "Attempting to forward remote port to "
5469 "%s:%d", realpf
->dhost
, realpf
->dport
);
5471 logeventf(ssh
, "Port open failed: %s", e
);
5472 error
= "Port open failed";
5474 logevent("Forwarded port opened successfully");
5475 c
->type
= CHAN_SOCKDATA
;
5478 } else if (typelen
== 22 &&
5479 !memcmp(type
, "auth-agent@openssh.com", 3)) {
5480 if (!ssh
->agentfwd_enabled
)
5481 error
= "Agent forwarding is not enabled";
5483 c
->type
= CHAN_AGENT
; /* identify channel type */
5484 c
->u
.a
.lensofar
= 0;
5487 error
= "Unsupported channel type requested";
5490 c
->remoteid
= remid
;
5492 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_FAILURE
);
5493 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5494 ssh2_pkt_adduint32(pktout
, SSH2_OPEN_CONNECT_FAILED
);
5495 ssh2_pkt_addstring(pktout
, error
);
5496 ssh2_pkt_addstring(pktout
, "en"); /* language tag */
5497 ssh2_pkt_send(ssh
, pktout
);
5498 logeventf(ssh
, "Rejected channel open: %s", error
);
5501 c
->localid
= alloc_channel_id(ssh
);
5503 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
5504 c
->v
.v2
.remwindow
= winsize
;
5505 c
->v
.v2
.remmaxpkt
= pktsize
;
5506 bufchain_init(&c
->v
.v2
.outbuffer
);
5507 add234(ssh
->channels
, c
);
5508 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
);
5509 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5510 ssh2_pkt_adduint32(pktout
, c
->localid
);
5511 ssh2_pkt_adduint32(pktout
, c
->v
.v2
.locwindow
);
5512 ssh2_pkt_adduint32(pktout
, 0x4000UL
); /* our max pkt size */
5513 ssh2_pkt_send(ssh
, pktout
);
5518 * Handle the SSH2 userauth and connection layers.
5520 static void do_ssh2_authconn(Ssh ssh
, unsigned char *in
, int inlen
,
5521 struct Packet
*pktin
)
5523 struct do_ssh2_authconn_state
{
5525 AUTH_INVALID
, AUTH_PUBLICKEY_AGENT
, AUTH_PUBLICKEY_FILE
,
5527 AUTH_KEYBOARD_INTERACTIVE
5531 AUTH_TYPE_PUBLICKEY
,
5532 AUTH_TYPE_PUBLICKEY_OFFER_LOUD
,
5533 AUTH_TYPE_PUBLICKEY_OFFER_QUIET
,
5535 AUTH_TYPE_KEYBOARD_INTERACTIVE
,
5536 AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
5538 int gotit
, need_pw
, can_pubkey
, can_passwd
, can_keyb_inter
;
5539 int tried_pubkey_config
, tried_agent
, tried_keyb_inter
;
5540 int kbd_inter_running
;
5542 int num_prompts
, curr_prompt
, echo
;
5547 void *publickey_blob
;
5548 int publickey_bloblen
;
5549 unsigned char request
[5], *response
, *p
;
5553 char *pkblob
, *alg
, *commentp
;
5554 int pklen
, alglen
, commentlen
;
5555 int siglen
, retlen
, len
;
5556 char *q
, *agentreq
, *ret
;
5558 int num_env
, env_left
, env_ok
;
5559 struct Packet
*pktout
;
5561 crState(do_ssh2_authconn_state
);
5563 crBegin(ssh
->do_ssh2_authconn_crstate
);
5566 * Request userauth protocol, and await a response to it.
5568 s
->pktout
= ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST
);
5569 ssh2_pkt_addstring(s
->pktout
, "ssh-userauth");
5570 ssh2_pkt_send(ssh
, s
->pktout
);
5571 crWaitUntilV(pktin
);
5572 if (pktin
->type
!= SSH2_MSG_SERVICE_ACCEPT
) {
5573 bombout(("Server refused user authentication protocol"));
5578 * We repeat this whole loop, including the username prompt,
5579 * until we manage a successful authentication. If the user
5580 * types the wrong _password_, they can be sent back to the
5581 * beginning to try another username, if this is configured on.
5582 * (If they specify a username in the config, they are never
5583 * asked, even if they do give a wrong password.)
5585 * I think this best serves the needs of
5587 * - the people who have no configuration, no keys, and just
5588 * want to try repeated (username,password) pairs until they
5589 * type both correctly
5591 * - people who have keys and configuration but occasionally
5592 * need to fall back to passwords
5594 * - people with a key held in Pageant, who might not have
5595 * logged in to a particular machine before; so they want to
5596 * type a username, and then _either_ their key will be
5597 * accepted, _or_ they will type a password. If they mistype
5598 * the username they will want to be able to get back and
5601 s
->username
[0] = '\0';
5602 s
->got_username
= FALSE
;
5607 if (s
->got_username
&& !ssh
->cfg
.change_username
) {
5609 * We got a username last time round this loop, and
5610 * with change_username turned off we don't try to get
5613 } else if (!*ssh
->cfg
.username
) {
5614 if (ssh_get_line
&& !ssh_getline_pw_only
) {
5615 if (!ssh_get_line("login as: ",
5616 s
->username
, sizeof(s
->username
), FALSE
)) {
5618 * get_line failed to get a username.
5621 logevent("No username provided. Abandoning session.");
5622 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5626 int ret
; /* need not be saved across crReturn */
5627 c_write_str(ssh
, "login as: ");
5629 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
5631 crWaitUntilV(!pktin
);
5632 ret
= process_userpass_input(ssh
, in
, inlen
);
5636 c_write_str(ssh
, "\r\n");
5638 s
->username
[strcspn(s
->username
, "\n\r")] = '\0';
5641 strncpy(s
->username
, ssh
->cfg
.username
, sizeof(s
->username
));
5642 s
->username
[sizeof(s
->username
)-1] = '\0';
5643 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
5644 stuff
= dupprintf("Using username \"%s\".\r\n", s
->username
);
5645 c_write_str(ssh
, stuff
);
5649 s
->got_username
= TRUE
;
5652 * Send an authentication request using method "none": (a)
5653 * just in case it succeeds, and (b) so that we know what
5654 * authentication methods we can usefully try next.
5656 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
5658 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
5659 ssh2_pkt_addstring(s
->pktout
, s
->username
);
5660 ssh2_pkt_addstring(s
->pktout
, "ssh-connection");/* service requested */
5661 ssh2_pkt_addstring(s
->pktout
, "none"); /* method */
5662 ssh2_pkt_send(ssh
, s
->pktout
);
5663 s
->type
= AUTH_TYPE_NONE
;
5665 s
->we_are_in
= FALSE
;
5667 s
->tried_pubkey_config
= FALSE
;
5668 s
->tried_agent
= FALSE
;
5669 s
->tried_keyb_inter
= FALSE
;
5670 s
->kbd_inter_running
= FALSE
;
5671 /* Load the pub half of ssh->cfg.keyfile so we notice if it's in Pageant */
5672 if (!filename_is_null(ssh
->cfg
.keyfile
)) {
5674 logeventf(ssh
, "Reading private key file \"%.150s\"",
5675 filename_to_str(&ssh
->cfg
.keyfile
));
5676 keytype
= key_type(&ssh
->cfg
.keyfile
);
5677 if (keytype
== SSH_KEYTYPE_SSH2
) {
5679 ssh2_userkey_loadpub(&ssh
->cfg
.keyfile
, NULL
,
5680 &s
->publickey_bloblen
, NULL
);
5683 logeventf(ssh
, "Unable to use this key file (%s)",
5684 key_type_to_str(keytype
));
5685 msgbuf
= dupprintf("Unable to use key file \"%.150s\""
5687 filename_to_str(&ssh
->cfg
.keyfile
),
5688 key_type_to_str(keytype
));
5689 c_write_str(ssh
, msgbuf
);
5691 s
->publickey_blob
= NULL
;
5694 s
->publickey_blob
= NULL
;
5698 * Wait for the result of the last authentication request.
5701 crWaitUntilV(pktin
);
5702 while (pktin
->type
== SSH2_MSG_USERAUTH_BANNER
) {
5706 * Don't show the banner if we're operating in
5707 * non-verbose non-interactive mode. (It's probably
5708 * a script, which means nobody will read the
5709 * banner _anyway_, and moreover the printing of
5710 * the banner will screw up processing on the
5711 * output of (say) plink.)
5713 if (flags
& (FLAG_VERBOSE
| FLAG_INTERACTIVE
)) {
5714 ssh_pkt_getstring(pktin
, &banner
, &size
);
5716 c_write_untrusted(ssh
, banner
, size
);
5718 crWaitUntilV(pktin
);
5720 if (pktin
->type
== SSH2_MSG_USERAUTH_SUCCESS
) {
5721 logevent("Access granted");
5722 s
->we_are_in
= TRUE
;
5726 if (s
->kbd_inter_running
&&
5727 pktin
->type
== SSH2_MSG_USERAUTH_INFO_REQUEST
) {
5729 * This is either a further set-of-prompts packet
5730 * in keyboard-interactive authentication, or it's
5731 * the same one and we came back here with `gotit'
5732 * set. In the former case, we must reset the
5733 * curr_prompt variable.
5737 } else if (pktin
->type
!= SSH2_MSG_USERAUTH_FAILURE
) {
5738 bombout(("Strange packet received during authentication: type %d",
5746 * OK, we're now sitting on a USERAUTH_FAILURE message, so
5747 * we can look at the string in it and know what we can
5748 * helpfully try next.
5750 if (pktin
->type
== SSH2_MSG_USERAUTH_FAILURE
) {
5753 ssh_pkt_getstring(pktin
, &methods
, &methlen
);
5754 s
->kbd_inter_running
= FALSE
;
5755 if (!ssh2_pkt_getbool(pktin
)) {
5757 * We have received an unequivocal Access
5758 * Denied. This can translate to a variety of
5761 * - if we'd just tried "none" authentication,
5762 * it's not worth printing anything at all
5764 * - if we'd just tried a public key _offer_,
5765 * the message should be "Server refused our
5766 * key" (or no message at all if the key
5767 * came from Pageant)
5769 * - if we'd just tried anything else, the
5770 * message really should be "Access denied".
5772 * Additionally, if we'd just tried password
5773 * authentication, we should break out of this
5774 * whole loop so as to go back to the username
5775 * prompt (iff we're configured to allow
5776 * username change attempts).
5778 if (s
->type
== AUTH_TYPE_NONE
) {
5780 } else if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
||
5781 s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_QUIET
) {
5782 if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
)
5783 c_write_str(ssh
, "Server refused our key\r\n");
5784 logevent("Server refused public key");
5785 } else if (s
->type
==AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
) {
5786 /* server declined keyboard-interactive; ignore */
5788 c_write_str(ssh
, "Access denied\r\n");
5789 logevent("Access denied");
5790 if (s
->type
== AUTH_TYPE_PASSWORD
&&
5791 ssh
->cfg
.change_username
) {
5792 /* XXX perhaps we should allow
5793 * keyboard-interactive to do this too? */
5794 s
->we_are_in
= FALSE
;
5799 c_write_str(ssh
, "Further authentication required\r\n");
5800 logevent("Further authentication required");
5804 in_commasep_string("publickey", methods
, methlen
);
5806 in_commasep_string("password", methods
, methlen
);
5807 s
->can_keyb_inter
= ssh
->cfg
.try_ki_auth
&&
5808 in_commasep_string("keyboard-interactive", methods
, methlen
);
5812 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
5816 * Most password/passphrase prompts will be
5817 * non-echoing, so we set this to 0 by default.
5818 * Exception is that some keyboard-interactive prompts
5819 * can be echoing, in which case we'll set this to 1.
5823 if (!s
->method
&& s
->can_pubkey
&&
5824 agent_exists() && !s
->tried_agent
) {
5826 * Attempt public-key authentication using Pageant.
5831 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
5832 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
5834 s
->tried_agent
= TRUE
;
5836 logevent("Pageant is running. Requesting keys.");
5838 /* Request the keys held by the agent. */
5839 PUT_32BIT(s
->request
, 1);
5840 s
->request
[4] = SSH2_AGENTC_REQUEST_IDENTITIES
;
5841 if (!agent_query(s
->request
, 5, &r
, &s
->responselen
,
5842 ssh_agent_callback
, ssh
)) {
5846 bombout(("Unexpected data from server while"
5847 " waiting for agent response"));
5850 } while (pktin
|| inlen
> 0);
5851 r
= ssh
->agent_response
;
5852 s
->responselen
= ssh
->agent_response_len
;
5854 s
->response
= (unsigned char *) r
;
5855 if (s
->response
&& s
->responselen
>= 5 &&
5856 s
->response
[4] == SSH2_AGENT_IDENTITIES_ANSWER
) {
5857 s
->p
= s
->response
+ 5;
5858 s
->nkeys
= GET_32BIT(s
->p
);
5862 sprintf(buf
, "Pageant has %d SSH2 keys", s
->nkeys
);
5865 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
5870 sprintf(buf
, "Trying Pageant key #%d", s
->keyi
);
5873 s
->pklen
= GET_32BIT(s
->p
);
5875 if (s
->publickey_blob
&&
5876 s
->pklen
== s
->publickey_bloblen
&&
5877 !memcmp(s
->p
, s
->publickey_blob
,
5878 s
->publickey_bloblen
)) {
5879 logevent("This key matches configured key file");
5880 s
->tried_pubkey_config
= 1;
5882 s
->pkblob
= (char *)s
->p
;
5884 s
->alglen
= GET_32BIT(s
->pkblob
);
5885 s
->alg
= s
->pkblob
+ 4;
5886 s
->commentlen
= GET_32BIT(s
->p
);
5888 s
->commentp
= (char *)s
->p
;
5889 s
->p
+= s
->commentlen
;
5890 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
5891 ssh2_pkt_addstring(s
->pktout
, s
->username
);
5892 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
5893 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
5894 ssh2_pkt_addbool(s
->pktout
, FALSE
); /* no signature included */
5895 ssh2_pkt_addstring_start(s
->pktout
);
5896 ssh2_pkt_addstring_data(s
->pktout
, s
->alg
, s
->alglen
);
5897 ssh2_pkt_addstring_start(s
->pktout
);
5898 ssh2_pkt_addstring_data(s
->pktout
, s
->pkblob
, s
->pklen
);
5899 ssh2_pkt_send(ssh
, s
->pktout
);
5901 crWaitUntilV(pktin
);
5902 if (pktin
->type
!= SSH2_MSG_USERAUTH_PK_OK
) {
5903 logevent("Key refused");
5907 if (flags
& FLAG_VERBOSE
) {
5908 c_write_str(ssh
, "Authenticating with "
5910 c_write(ssh
, s
->commentp
, s
->commentlen
);
5911 c_write_str(ssh
, "\" from agent\r\n");
5915 * Server is willing to accept the key.
5916 * Construct a SIGN_REQUEST.
5918 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
5919 ssh2_pkt_addstring(s
->pktout
, s
->username
);
5920 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
5921 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
5922 ssh2_pkt_addbool(s
->pktout
, TRUE
);
5923 ssh2_pkt_addstring_start(s
->pktout
);
5924 ssh2_pkt_addstring_data(s
->pktout
, s
->alg
, s
->alglen
);
5925 ssh2_pkt_addstring_start(s
->pktout
);
5926 ssh2_pkt_addstring_data(s
->pktout
, s
->pkblob
, s
->pklen
);
5928 s
->siglen
= s
->pktout
->length
- 5 + 4 + 20;
5929 if (ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)
5931 s
->len
= 1; /* message type */
5932 s
->len
+= 4 + s
->pklen
; /* key blob */
5933 s
->len
+= 4 + s
->siglen
; /* data to sign */
5934 s
->len
+= 4; /* flags */
5935 s
->agentreq
= snewn(4 + s
->len
, char);
5936 PUT_32BIT(s
->agentreq
, s
->len
);
5937 s
->q
= s
->agentreq
+ 4;
5938 *s
->q
++ = SSH2_AGENTC_SIGN_REQUEST
;
5939 PUT_32BIT(s
->q
, s
->pklen
);
5941 memcpy(s
->q
, s
->pkblob
, s
->pklen
);
5943 PUT_32BIT(s
->q
, s
->siglen
);
5945 /* Now the data to be signed... */
5946 if (!(ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)) {
5947 PUT_32BIT(s
->q
, 20);
5950 memcpy(s
->q
, ssh
->v2_session_id
, 20);
5952 memcpy(s
->q
, s
->pktout
->data
+ 5,
5953 s
->pktout
->length
- 5);
5954 s
->q
+= s
->pktout
->length
- 5;
5955 /* And finally the (zero) flags word. */
5957 if (!agent_query(s
->agentreq
, s
->len
+ 4,
5959 ssh_agent_callback
, ssh
)) {
5963 bombout(("Unexpected data from server"
5964 " while waiting for agent"
5968 } while (pktin
|| inlen
> 0);
5969 vret
= ssh
->agent_response
;
5970 s
->retlen
= ssh
->agent_response_len
;
5975 if (s
->ret
[4] == SSH2_AGENT_SIGN_RESPONSE
) {
5976 logevent("Sending Pageant's response");
5977 ssh2_add_sigblob(ssh
, s
->pktout
,
5978 s
->pkblob
, s
->pklen
,
5980 GET_32BIT(s
->ret
+ 5));
5981 ssh2_pkt_send(ssh
, s
->pktout
);
5986 ("Pageant failed to answer challenge");
5997 if (!s
->method
&& s
->can_pubkey
&& s
->publickey_blob
5998 && !s
->tried_pubkey_config
) {
5999 unsigned char *pub_blob
;
6000 char *algorithm
, *comment
;
6003 s
->tried_pubkey_config
= TRUE
;
6005 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6006 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
6009 * Try the public key supplied in the configuration.
6011 * First, offer the public blob to see if the server is
6012 * willing to accept it.
6015 (unsigned char *)ssh2_userkey_loadpub(&ssh
->cfg
.keyfile
,
6020 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6021 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6022 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6023 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6024 ssh2_pkt_addbool(s
->pktout
, FALSE
); /* no signature included */
6025 ssh2_pkt_addstring(s
->pktout
, algorithm
);
6026 ssh2_pkt_addstring_start(s
->pktout
);
6027 ssh2_pkt_addstring_data(s
->pktout
, (char *)pub_blob
,
6029 ssh2_pkt_send(ssh
, s
->pktout
);
6030 logevent("Offered public key");
6032 crWaitUntilV(pktin
);
6033 if (pktin
->type
!= SSH2_MSG_USERAUTH_PK_OK
) {
6035 s
->type
= AUTH_TYPE_PUBLICKEY_OFFER_LOUD
;
6036 continue; /* key refused; give up on it */
6039 logevent("Offer of public key accepted");
6041 * Actually attempt a serious authentication using
6044 if (ssh2_userkey_encrypted(&ssh
->cfg
.keyfile
, &comment
)) {
6045 sprintf(s
->pwprompt
,
6046 "Passphrase for key \"%.100s\": ",
6052 if (flags
& FLAG_VERBOSE
) {
6053 c_write_str(ssh
, "Authenticating with public key \"");
6054 c_write_str(ssh
, comment
);
6055 c_write_str(ssh
, "\"\r\n");
6057 s
->method
= AUTH_PUBLICKEY_FILE
;
6061 if (!s
->method
&& s
->can_keyb_inter
&& !s
->tried_keyb_inter
) {
6062 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
6063 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
6064 s
->tried_keyb_inter
= TRUE
;
6066 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6067 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
6069 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6070 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6071 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6072 ssh2_pkt_addstring(s
->pktout
, "keyboard-interactive"); /* method */
6073 ssh2_pkt_addstring(s
->pktout
, ""); /* lang */
6074 ssh2_pkt_addstring(s
->pktout
, "");
6075 ssh2_pkt_send(ssh
, s
->pktout
);
6077 crWaitUntilV(pktin
);
6078 if (pktin
->type
!= SSH2_MSG_USERAUTH_INFO_REQUEST
) {
6079 if (pktin
->type
== SSH2_MSG_USERAUTH_FAILURE
)
6081 logevent("Keyboard-interactive authentication refused");
6082 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
;
6086 s
->kbd_inter_running
= TRUE
;
6090 if (s
->kbd_inter_running
) {
6091 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
6092 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
6093 s
->tried_keyb_inter
= TRUE
;
6095 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6096 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
6098 if (s
->curr_prompt
== 0) {
6100 * We've got a fresh USERAUTH_INFO_REQUEST.
6101 * Display header data, and start going through
6104 char *name
, *inst
, *lang
;
6105 int name_len
, inst_len
, lang_len
;
6107 ssh_pkt_getstring(pktin
, &name
, &name_len
);
6108 ssh_pkt_getstring(pktin
, &inst
, &inst_len
);
6109 ssh_pkt_getstring(pktin
, &lang
, &lang_len
);
6111 c_write_untrusted(ssh
, name
, name_len
);
6112 c_write_str(ssh
, "\r\n");
6115 c_write_untrusted(ssh
, inst
, inst_len
);
6116 c_write_str(ssh
, "\r\n");
6118 s
->num_prompts
= ssh_pkt_getuint32(pktin
);
6122 * If there are prompts remaining in the packet,
6123 * display one and get a response.
6125 if (s
->curr_prompt
< s
->num_prompts
) {
6129 ssh_pkt_getstring(pktin
, &prompt
, &prompt_len
);
6130 if (prompt_len
> 0) {
6131 static const char trunc
[] = "<prompt truncated>: ";
6132 static const int prlen
= sizeof(s
->pwprompt
) -
6134 if (prompt_len
> prlen
) {
6135 memcpy(s
->pwprompt
, prompt
, prlen
);
6136 strcpy(s
->pwprompt
+ prlen
, trunc
);
6138 memcpy(s
->pwprompt
, prompt
, prompt_len
);
6139 s
->pwprompt
[prompt_len
] = '\0';
6143 "<server failed to send prompt>: ");
6145 s
->echo
= ssh2_pkt_getbool(pktin
);
6151 if (!s
->method
&& s
->can_passwd
) {
6152 s
->method
= AUTH_PASSWORD
;
6153 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6154 ssh
->pkt_ctx
|= SSH2_PKTCTX_PASSWORD
;
6155 sprintf(s
->pwprompt
, "%.90s@%.90s's password: ", s
->username
,
6162 if (!ssh_get_line(s
->pwprompt
, s
->password
,
6163 sizeof(s
->password
), TRUE
)) {
6165 * get_line failed to get a password (for
6166 * example because one was supplied on the
6167 * command line which has already failed to
6170 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
6171 ssh2_pkt_adduint32(s
->pktout
,SSH2_DISCONNECT_BY_APPLICATION
);
6172 ssh2_pkt_addstring(s
->pktout
, "No more passwords available"
6174 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
6175 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
6176 logevent("Unable to authenticate");
6177 connection_fatal(ssh
->frontend
,
6178 "Unable to authenticate");
6179 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6183 int ret
; /* need not be saved across crReturn */
6184 c_write_untrusted(ssh
, s
->pwprompt
, strlen(s
->pwprompt
));
6187 setup_userpass_input(ssh
, s
->password
,
6188 sizeof(s
->password
), s
->echo
);
6190 crWaitUntilV(!pktin
);
6191 ret
= process_userpass_input(ssh
, in
, inlen
);
6195 c_write_str(ssh
, "\r\n");
6199 if (s
->method
== AUTH_PUBLICKEY_FILE
) {
6201 * We have our passphrase. Now try the actual authentication.
6203 struct ssh2_userkey
*key
;
6204 const char *error
= NULL
;
6206 key
= ssh2_load_userkey(&ssh
->cfg
.keyfile
, s
->password
,
6208 if (key
== SSH2_WRONG_PASSPHRASE
|| key
== NULL
) {
6209 if (key
== SSH2_WRONG_PASSPHRASE
) {
6210 c_write_str(ssh
, "Wrong passphrase\r\n");
6211 s
->tried_pubkey_config
= FALSE
;
6213 c_write_str(ssh
, "Unable to load private key (");
6214 c_write_str(ssh
, error
);
6215 c_write_str(ssh
, ")\r\n");
6216 s
->tried_pubkey_config
= TRUE
;
6218 /* Send a spurious AUTH_NONE to return to the top. */
6219 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6220 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6221 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6222 ssh2_pkt_addstring(s
->pktout
, "none"); /* method */
6223 ssh2_pkt_send(ssh
, s
->pktout
);
6224 s
->type
= AUTH_TYPE_NONE
;
6226 unsigned char *pkblob
, *sigblob
, *sigdata
;
6227 int pkblob_len
, sigblob_len
, sigdata_len
;
6231 * We have loaded the private key and the server
6232 * has announced that it's willing to accept it.
6233 * Hallelujah. Generate a signature and send it.
6235 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6236 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6237 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6238 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6239 ssh2_pkt_addbool(s
->pktout
, TRUE
);
6240 ssh2_pkt_addstring(s
->pktout
, key
->alg
->name
);
6241 pkblob
= key
->alg
->public_blob(key
->data
, &pkblob_len
);
6242 ssh2_pkt_addstring_start(s
->pktout
);
6243 ssh2_pkt_addstring_data(s
->pktout
, (char *)pkblob
, pkblob_len
);
6246 * The data to be signed is:
6250 * followed by everything so far placed in the
6253 sigdata_len
= s
->pktout
->length
- 5 + 4 + 20;
6254 if (ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)
6256 sigdata
= snewn(sigdata_len
, unsigned char);
6258 if (!(ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)) {
6259 PUT_32BIT(sigdata
+p
, 20);
6262 memcpy(sigdata
+p
, ssh
->v2_session_id
, 20); p
+= 20;
6263 memcpy(sigdata
+p
, s
->pktout
->data
+ 5,
6264 s
->pktout
->length
- 5);
6265 p
+= s
->pktout
->length
- 5;
6266 assert(p
== sigdata_len
);
6267 sigblob
= key
->alg
->sign(key
->data
, (char *)sigdata
,
6268 sigdata_len
, &sigblob_len
);
6269 ssh2_add_sigblob(ssh
, s
->pktout
, pkblob
, pkblob_len
,
6270 sigblob
, sigblob_len
);
6275 ssh2_pkt_send(ssh
, s
->pktout
);
6276 s
->type
= AUTH_TYPE_PUBLICKEY
;
6277 key
->alg
->freekey(key
->data
);
6279 } else if (s
->method
== AUTH_PASSWORD
) {
6281 * We send the password packet lumped tightly together with
6282 * an SSH_MSG_IGNORE packet. The IGNORE packet contains a
6283 * string long enough to make the total length of the two
6284 * packets constant. This should ensure that a passive
6285 * listener doing traffic analyis can't work out the length
6288 * For this to work, we need an assumption about the
6289 * maximum length of the password packet. I think 256 is
6290 * pretty conservative. Anyone using a password longer than
6291 * that probably doesn't have much to worry about from
6292 * people who find out how long their password is!
6294 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6295 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6296 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6297 ssh2_pkt_addstring(s
->pktout
, "password");
6298 ssh2_pkt_addbool(s
->pktout
, FALSE
);
6299 dont_log_password(ssh
, s
->pktout
, PKTLOG_BLANK
);
6300 ssh2_pkt_addstring(s
->pktout
, s
->password
);
6301 memset(s
->password
, 0, sizeof(s
->password
));
6302 end_log_omission(ssh
, s
->pktout
);
6303 ssh2_pkt_defer(ssh
, s
->pktout
);
6305 * We'll include a string that's an exact multiple of the
6306 * cipher block size. If the cipher is NULL for some
6307 * reason, we don't do this trick at all because we gain
6310 if (ssh
->cscipher
) {
6313 stringlen
= (256 - ssh
->deferred_len
);
6314 stringlen
+= ssh
->cscipher
->blksize
- 1;
6315 stringlen
-= (stringlen
% ssh
->cscipher
->blksize
);
6318 * Temporarily disable actual compression,
6319 * so we can guarantee to get this string
6320 * exactly the length we want it. The
6321 * compression-disabling routine should
6322 * return an integer indicating how many
6323 * bytes we should adjust our string length
6327 ssh
->cscomp
->disable_compression(ssh
->cs_comp_ctx
);
6329 s
->pktout
= ssh2_pkt_init(SSH2_MSG_IGNORE
);
6330 ssh2_pkt_addstring_start(s
->pktout
);
6331 for (i
= 0; i
< stringlen
; i
++) {
6332 char c
= (char) random_byte();
6333 ssh2_pkt_addstring_data(s
->pktout
, &c
, 1);
6335 ssh2_pkt_defer(ssh
, s
->pktout
);
6337 ssh_pkt_defersend(ssh
);
6338 logevent("Sent password");
6339 s
->type
= AUTH_TYPE_PASSWORD
;
6340 } else if (s
->method
== AUTH_KEYBOARD_INTERACTIVE
) {
6341 if (s
->curr_prompt
== 0) {
6342 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_INFO_RESPONSE
);
6343 ssh2_pkt_adduint32(s
->pktout
, s
->num_prompts
);
6345 if (s
->need_pw
) { /* only add pw if we just got one! */
6346 dont_log_password(ssh
, s
->pktout
, PKTLOG_BLANK
);
6347 ssh2_pkt_addstring(s
->pktout
, s
->password
);
6348 memset(s
->password
, 0, sizeof(s
->password
));
6349 end_log_omission(ssh
, s
->pktout
);
6352 if (s
->curr_prompt
>= s
->num_prompts
) {
6353 ssh2_pkt_send(ssh
, s
->pktout
);
6356 * If there are prompts remaining, we set
6357 * `gotit' so that we won't attempt to get
6358 * another packet. Then we go back round the
6359 * loop and will end up retrieving another
6360 * prompt out of the existing packet. Funky or
6365 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
6367 c_write_str(ssh
, "No supported authentication methods"
6368 " left to try!\r\n");
6369 logevent("No supported authentications offered."
6371 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
6372 ssh2_pkt_adduint32(s
->pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
6373 ssh2_pkt_addstring(s
->pktout
, "No supported authentication"
6374 " methods available");
6375 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
6376 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
6377 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6381 } while (!s
->we_are_in
);
6384 * Now we're authenticated for the connection protocol. The
6385 * connection protocol will automatically have started at this
6386 * point; there's no need to send SERVICE_REQUEST.
6389 ssh
->channels
= newtree234(ssh_channelcmp
);
6392 * Set up handlers for some connection protocol messages, so we
6393 * don't have to handle them repeatedly in this coroutine.
6395 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_WINDOW_ADJUST
] =
6396 ssh2_msg_channel_window_adjust
;
6397 ssh
->packet_dispatch
[SSH2_MSG_GLOBAL_REQUEST
] =
6398 ssh2_msg_global_request
;
6401 * Create the main session channel.
6403 if (!ssh
->cfg
.ssh_no_shell
) {
6404 ssh
->mainchan
= snew(struct ssh_channel
);
6405 ssh
->mainchan
->ssh
= ssh
;
6406 ssh
->mainchan
->localid
= alloc_channel_id(ssh
);
6407 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
6408 ssh2_pkt_addstring(s
->pktout
, "session");
6409 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->localid
);
6410 ssh
->mainchan
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
6411 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->v
.v2
.locwindow
);/* our window size */
6412 ssh2_pkt_adduint32(s
->pktout
, 0x4000UL
); /* our max pkt size */
6413 ssh2_pkt_send(ssh
, s
->pktout
);
6414 crWaitUntilV(pktin
);
6415 if (pktin
->type
!= SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
6416 bombout(("Server refused to open a session"));
6418 /* FIXME: error data comes back in FAILURE packet */
6420 if (ssh_pkt_getuint32(pktin
) != ssh
->mainchan
->localid
) {
6421 bombout(("Server's channel confirmation cited wrong channel"));
6424 ssh
->mainchan
->remoteid
= ssh_pkt_getuint32(pktin
);
6425 ssh
->mainchan
->type
= CHAN_MAINSESSION
;
6426 ssh
->mainchan
->closes
= 0;
6427 ssh
->mainchan
->v
.v2
.remwindow
= ssh_pkt_getuint32(pktin
);
6428 ssh
->mainchan
->v
.v2
.remmaxpkt
= ssh_pkt_getuint32(pktin
);
6429 bufchain_init(&ssh
->mainchan
->v
.v2
.outbuffer
);
6430 add234(ssh
->channels
, ssh
->mainchan
);
6431 update_specials_menu(ssh
->frontend
);
6432 logevent("Opened channel for session");
6434 ssh
->mainchan
= NULL
;
6437 * Now we have a channel, make dispatch table entries for
6438 * general channel-based messages.
6440 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_DATA
] =
6441 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EXTENDED_DATA
] =
6442 ssh2_msg_channel_data
;
6443 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EOF
] = ssh2_msg_channel_eof
;
6444 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_CLOSE
] = ssh2_msg_channel_close
;
6445 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
] =
6446 ssh2_msg_channel_open_confirmation
;
6447 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_FAILURE
] =
6448 ssh2_msg_channel_open_failure
;
6449 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_REQUEST
] =
6450 ssh2_msg_channel_request
;
6451 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN
] =
6452 ssh2_msg_channel_open
;
6455 * Potentially enable X11 forwarding.
6457 if (ssh
->mainchan
&& ssh
->cfg
.x11_forward
) {
6458 char proto
[20], data
[64];
6459 logevent("Requesting X11 forwarding");
6460 ssh
->x11auth
= x11_invent_auth(proto
, sizeof(proto
),
6461 data
, sizeof(data
), ssh
->cfg
.x11_auth
);
6462 x11_get_real_auth(ssh
->x11auth
, ssh
->cfg
.x11_display
);
6463 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
6464 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
6465 ssh2_pkt_addstring(s
->pktout
, "x11-req");
6466 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6467 ssh2_pkt_addbool(s
->pktout
, 0); /* many connections */
6468 ssh2_pkt_addstring(s
->pktout
, proto
);
6469 ssh2_pkt_addstring(s
->pktout
, data
);
6470 ssh2_pkt_adduint32(s
->pktout
, x11_get_screen_number(ssh
->cfg
.x11_display
));
6471 ssh2_pkt_send(ssh
, s
->pktout
);
6473 crWaitUntilV(pktin
);
6475 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
6476 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
6477 bombout(("Unexpected response to X11 forwarding request:"
6478 " packet type %d", pktin
->type
));
6481 logevent("X11 forwarding refused");
6483 logevent("X11 forwarding enabled");
6484 ssh
->X11_fwd_enabled
= TRUE
;
6489 * Enable port forwardings.
6494 int sport
,dport
,sserv
,dserv
;
6495 char sports
[256], dports
[256], saddr
[256], host
[256];
6497 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh2
);
6498 /* Add port forwardings. */
6499 ssh
->portfwd_strptr
= ssh
->cfg
.portfwd
;
6500 while (*ssh
->portfwd_strptr
) {
6501 type
= *ssh
->portfwd_strptr
++;
6504 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= '\t') {
6505 if (*ssh
->portfwd_strptr
== ':') {
6507 * We've seen a colon in the middle of the
6508 * source port number. This means that
6509 * everything we've seen until now is the
6510 * source _address_, so we'll move it into
6511 * saddr and start sports from the beginning
6514 ssh
->portfwd_strptr
++;
6516 strcpy(saddr
, sports
);
6519 if (n
< 255) sports
[n
++] = *ssh
->portfwd_strptr
++;
6523 if (*ssh
->portfwd_strptr
== '\t')
6524 ssh
->portfwd_strptr
++;
6526 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= ':') {
6527 if (n
< 255) host
[n
++] = *ssh
->portfwd_strptr
++;
6530 if (*ssh
->portfwd_strptr
== ':')
6531 ssh
->portfwd_strptr
++;
6533 while (*ssh
->portfwd_strptr
) {
6534 if (n
< 255) dports
[n
++] = *ssh
->portfwd_strptr
++;
6537 ssh
->portfwd_strptr
++;
6538 dport
= atoi(dports
);
6542 dport
= net_service_lookup(dports
);
6544 logeventf(ssh
, "Service lookup failed for destination"
6545 " port \"%s\"", dports
);
6549 while (*ssh
->portfwd_strptr
) ssh
->portfwd_strptr
++;
6551 ssh
->portfwd_strptr
++; /* eat the NUL and move to next one */
6553 sport
= atoi(sports
);
6557 sport
= net_service_lookup(sports
);
6559 logeventf(ssh
, "Service lookup failed for source"
6560 " port \"%s\"", sports
);
6563 if (sport
&& dport
) {
6564 /* Set up a description of the source port. */
6565 static char *sportdesc
;
6566 sportdesc
= dupprintf("%.*s%.*s%.*s%.*s%d%.*s",
6567 (int)(*saddr?
strlen(saddr
):0), *saddr?saddr
:NULL
,
6568 (int)(*saddr?
1:0), ":",
6569 (int)(sserv ?
strlen(sports
) : 0), sports
,
6570 sserv
, "(", sport
, sserv
, ")");
6572 /* Verbose description of the destination port */
6573 char *dportdesc
= dupprintf("%s:%.*s%.*s%d%.*s",
6575 (int)(dserv ?
strlen(dports
) : 0), dports
,
6576 dserv
, "(", dport
, dserv
, ")");
6577 const char *err
= pfd_addforward(host
, dport
,
6578 *saddr ? saddr
: NULL
,
6579 sport
, ssh
, &ssh
->cfg
);
6581 logeventf(ssh
, "Local port %s forward to %s"
6582 " failed: %s", sportdesc
, dportdesc
, err
);
6584 logeventf(ssh
, "Local port %s forwarding to %s",
6585 sportdesc
, dportdesc
);
6588 } else if (type
== 'D') {
6589 const char *err
= pfd_addforward(NULL
, -1,
6590 *saddr ? saddr
: NULL
,
6591 sport
, ssh
, &ssh
->cfg
);
6593 logeventf(ssh
, "Local port %s SOCKS dynamic forward"
6594 " setup failed: %s", sportdesc
, err
);
6596 logeventf(ssh
, "Local port %s doing SOCKS"
6597 " dynamic forwarding", sportdesc
);
6600 struct ssh_rportfwd
*pf
;
6601 pf
= snew(struct ssh_rportfwd
);
6602 strcpy(pf
->dhost
, host
);
6605 if (add234(ssh
->rportfwds
, pf
) != pf
) {
6606 logeventf(ssh
, "Duplicate remote port forwarding"
6607 " to %s:%d", host
, dport
);
6610 logeventf(ssh
, "Requesting remote port %s"
6611 " forward to %s:%.*s%.*s%d%.*s",
6614 (int)(dserv ?
strlen(dports
) : 0), dports
,
6615 dserv
, "(", dport
, dserv
, ")");
6616 s
->pktout
= ssh2_pkt_init(SSH2_MSG_GLOBAL_REQUEST
);
6617 ssh2_pkt_addstring(s
->pktout
, "tcpip-forward");
6618 ssh2_pkt_addbool(s
->pktout
, 1);/* want reply */
6620 ssh2_pkt_addstring(s
->pktout
, saddr
);
6621 } else if (ssh
->cfg
.rport_acceptall
) {
6622 ssh2_pkt_addstring(s
->pktout
, "0.0.0.0");
6624 ssh2_pkt_addstring(s
->pktout
, "127.0.0.1");
6626 ssh2_pkt_adduint32(s
->pktout
, sport
);
6627 ssh2_pkt_send(ssh
, s
->pktout
);
6629 crWaitUntilV(pktin
);
6631 if (pktin
->type
!= SSH2_MSG_REQUEST_SUCCESS
) {
6632 if (pktin
->type
!= SSH2_MSG_REQUEST_FAILURE
) {
6633 bombout(("Unexpected response to port "
6634 "forwarding request: packet type %d",
6638 logevent("Server refused this port forwarding");
6640 logevent("Remote port forwarding enabled");
6650 * Potentially enable agent forwarding.
6652 if (ssh
->mainchan
&& ssh
->cfg
.agentfwd
&& agent_exists()) {
6653 logevent("Requesting OpenSSH-style agent forwarding");
6654 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
6655 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
6656 ssh2_pkt_addstring(s
->pktout
, "auth-agent-req@openssh.com");
6657 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6658 ssh2_pkt_send(ssh
, s
->pktout
);
6660 crWaitUntilV(pktin
);
6662 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
6663 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
6664 bombout(("Unexpected response to agent forwarding request:"
6665 " packet type %d", pktin
->type
));
6668 logevent("Agent forwarding refused");
6670 logevent("Agent forwarding enabled");
6671 ssh
->agentfwd_enabled
= TRUE
;
6676 * Now allocate a pty for the session.
6678 if (ssh
->mainchan
&& !ssh
->cfg
.nopty
) {
6679 /* Unpick the terminal-speed string. */
6680 /* XXX perhaps we should allow no speeds to be sent. */
6681 ssh
->ospeed
= 38400; ssh
->ispeed
= 38400; /* last-resort defaults */
6682 sscanf(ssh
->cfg
.termspeed
, "%d,%d", &ssh
->ospeed
, &ssh
->ispeed
);
6683 /* Build the pty request. */
6684 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
6685 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
); /* recipient channel */
6686 ssh2_pkt_addstring(s
->pktout
, "pty-req");
6687 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6688 ssh2_pkt_addstring(s
->pktout
, ssh
->cfg
.termtype
);
6689 ssh2_pkt_adduint32(s
->pktout
, ssh
->term_width
);
6690 ssh2_pkt_adduint32(s
->pktout
, ssh
->term_height
);
6691 ssh2_pkt_adduint32(s
->pktout
, 0); /* pixel width */
6692 ssh2_pkt_adduint32(s
->pktout
, 0); /* pixel height */
6693 ssh2_pkt_addstring_start(s
->pktout
);
6694 ssh2_pkt_addbyte(s
->pktout
, 128); /* TTY_OP_ISPEED */
6695 ssh2_pkt_adduint32(s
->pktout
, ssh
->ispeed
);
6696 ssh2_pkt_addbyte(s
->pktout
, 129); /* TTY_OP_OSPEED */
6697 ssh2_pkt_adduint32(s
->pktout
, ssh
->ospeed
);
6698 ssh2_pkt_addstring_data(s
->pktout
, "\0", 1); /* TTY_OP_END */
6699 ssh2_pkt_send(ssh
, s
->pktout
);
6700 ssh
->state
= SSH_STATE_INTERMED
;
6702 crWaitUntilV(pktin
);
6704 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
6705 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
6706 bombout(("Unexpected response to pty request:"
6707 " packet type %d", pktin
->type
));
6710 c_write_str(ssh
, "Server refused to allocate pty\r\n");
6711 ssh
->editing
= ssh
->echoing
= 1;
6713 logeventf(ssh
, "Allocated pty (ospeed %dbps, ispeed %dbps)",
6714 ssh
->ospeed
, ssh
->ispeed
);
6717 ssh
->editing
= ssh
->echoing
= 1;
6721 * Send environment variables.
6723 * Simplest thing here is to send all the requests at once, and
6724 * then wait for a whole bunch of successes or failures.
6726 if (ssh
->mainchan
&& *ssh
->cfg
.environmt
) {
6727 char *e
= ssh
->cfg
.environmt
;
6728 char *var
, *varend
, *val
;
6734 while (*e
&& *e
!= '\t') e
++;
6736 if (*e
== '\t') e
++;
6741 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
6742 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
6743 ssh2_pkt_addstring(s
->pktout
, "env");
6744 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6745 ssh2_pkt_addstring_start(s
->pktout
);
6746 ssh2_pkt_addstring_data(s
->pktout
, var
, varend
-var
);
6747 ssh2_pkt_addstring(s
->pktout
, val
);
6748 ssh2_pkt_send(ssh
, s
->pktout
);
6753 logeventf(ssh
, "Sent %d environment variables", s
->num_env
);
6756 s
->env_left
= s
->num_env
;
6758 while (s
->env_left
> 0) {
6759 crWaitUntilV(pktin
);
6761 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
6762 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
6763 bombout(("Unexpected response to environment request:"
6764 " packet type %d", pktin
->type
));
6774 if (s
->env_ok
== s
->num_env
) {
6775 logevent("All environment variables successfully set");
6776 } else if (s
->env_ok
== 0) {
6777 logevent("All environment variables refused");
6778 c_write_str(ssh
, "Server refused to set environment variables\r\n");
6780 logeventf(ssh
, "%d environment variables refused",
6781 s
->num_env
- s
->env_ok
);
6782 c_write_str(ssh
, "Server refused to set all environment variables\r\n");
6787 * Start a shell or a remote command. We may have to attempt
6788 * this twice if the config data has provided a second choice
6791 if (ssh
->mainchan
) while (1) {
6795 if (ssh
->fallback_cmd
) {
6796 subsys
= ssh
->cfg
.ssh_subsys2
;
6797 cmd
= ssh
->cfg
.remote_cmd_ptr2
;
6799 subsys
= ssh
->cfg
.ssh_subsys
;
6800 cmd
= ssh
->cfg
.remote_cmd_ptr
;
6803 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
6804 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
); /* recipient channel */
6806 ssh2_pkt_addstring(s
->pktout
, "subsystem");
6807 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6808 ssh2_pkt_addstring(s
->pktout
, cmd
);
6810 ssh2_pkt_addstring(s
->pktout
, "exec");
6811 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6812 ssh2_pkt_addstring(s
->pktout
, cmd
);
6814 ssh2_pkt_addstring(s
->pktout
, "shell");
6815 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6817 ssh2_pkt_send(ssh
, s
->pktout
);
6819 crWaitUntilV(pktin
);
6821 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
6822 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
6823 bombout(("Unexpected response to shell/command request:"
6824 " packet type %d", pktin
->type
));
6828 * We failed to start the command. If this is the
6829 * fallback command, we really are finished; if it's
6830 * not, and if the fallback command exists, try falling
6831 * back to it before complaining.
6833 if (!ssh
->fallback_cmd
&& ssh
->cfg
.remote_cmd_ptr2
!= NULL
) {
6834 logevent("Primary command failed; attempting fallback");
6835 ssh
->fallback_cmd
= TRUE
;
6838 bombout(("Server refused to start a shell/command"));
6841 logevent("Started a shell/command");
6846 ssh
->state
= SSH_STATE_SESSION
;
6847 if (ssh
->size_needed
)
6848 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
6849 if (ssh
->eof_needed
)
6850 ssh_special(ssh
, TS_EOF
);
6856 ldisc_send(ssh
->ldisc
, NULL
, 0, 0);/* cause ldisc to notice changes */
6861 s
->try_send
= FALSE
;
6865 * _All_ the connection-layer packets we expect to
6866 * receive are now handled by the dispatch table.
6867 * Anything that reaches here must be bogus.
6870 bombout(("Strange packet received: type %d", pktin
->type
));
6872 } else if (ssh
->mainchan
) {
6874 * We have spare data. Add it to the channel buffer.
6876 ssh2_add_channel_data(ssh
->mainchan
, (char *)in
, inlen
);
6881 struct ssh_channel
*c
;
6883 * Try to send data on all channels if we can.
6885 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
6888 continue; /* don't send on closing channels */
6889 bufsize
= ssh2_try_send(c
);
6892 case CHAN_MAINSESSION
:
6893 /* stdin need not receive an unthrottle
6894 * notification since it will be polled */
6897 x11_unthrottle(c
->u
.x11
.s
);
6900 /* agent sockets are request/response and need no
6901 * buffer management */
6904 pfd_unthrottle(c
->u
.pfd
.s
);
6916 * Handlers for SSH2 messages that might arrive at any moment.
6918 void ssh2_msg_disconnect(Ssh ssh
, struct Packet
*pktin
)
6920 /* log reason code in disconnect message */
6922 int nowlen
, reason
, msglen
;
6924 reason
= ssh_pkt_getuint32(pktin
);
6925 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
6927 if (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) {
6928 buf
= dupprintf("Received disconnect message (%s)",
6929 ssh2_disconnect_reasons
[reason
]);
6931 buf
= dupprintf("Received disconnect message (unknown"
6932 " type %d)", reason
);
6936 buf
= dupprintf("Disconnection message text: %n%.*s",
6937 &nowlen
, msglen
, msg
);
6939 bombout(("Server sent disconnect message\ntype %d (%s):\n\"%s\"",
6941 (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) ?
6942 ssh2_disconnect_reasons
[reason
] : "unknown",
6947 void ssh2_msg_debug(Ssh ssh
, struct Packet
*pktin
)
6949 /* log the debug message */
6954 /* XXX maybe we should actually take notice of this */
6955 always_display
= ssh2_pkt_getbool(pktin
);
6956 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
6958 buf
= dupprintf("Remote debug message: %.*s", msglen
, msg
);
6963 void ssh2_msg_something_unimplemented(Ssh ssh
, struct Packet
*pktin
)
6965 struct Packet
*pktout
;
6966 pktout
= ssh2_pkt_init(SSH2_MSG_UNIMPLEMENTED
);
6967 ssh2_pkt_adduint32(pktout
, pktin
->sequence
);
6969 * UNIMPLEMENTED messages MUST appear in the same order as the
6970 * messages they respond to. Hence, never queue them.
6972 ssh2_pkt_send_noqueue(ssh
, pktout
);
6976 * Handle the top-level SSH2 protocol.
6978 static void ssh2_protocol_setup(Ssh ssh
)
6983 * Most messages cause SSH2_MSG_UNIMPLEMENTED.
6985 for (i
= 0; i
< 256; i
++)
6986 ssh
->packet_dispatch
[i
] = ssh2_msg_something_unimplemented
;
6989 * Any message we actually understand, we set to NULL so that
6990 * the coroutines will get it.
6992 ssh
->packet_dispatch
[SSH2_MSG_UNIMPLEMENTED
] = NULL
;
6993 ssh
->packet_dispatch
[SSH2_MSG_SERVICE_REQUEST
] = NULL
;
6994 ssh
->packet_dispatch
[SSH2_MSG_SERVICE_ACCEPT
] = NULL
;
6995 ssh
->packet_dispatch
[SSH2_MSG_KEXINIT
] = NULL
;
6996 ssh
->packet_dispatch
[SSH2_MSG_NEWKEYS
] = NULL
;
6997 ssh
->packet_dispatch
[SSH2_MSG_KEXDH_INIT
] = NULL
;
6998 ssh
->packet_dispatch
[SSH2_MSG_KEXDH_REPLY
] = NULL
;
6999 /* ssh->packet_dispatch[SSH2_MSG_KEX_DH_GEX_REQUEST] = NULL; duplicate case value */
7000 /* ssh->packet_dispatch[SSH2_MSG_KEX_DH_GEX_GROUP] = NULL; duplicate case value */
7001 ssh
->packet_dispatch
[SSH2_MSG_KEX_DH_GEX_INIT
] = NULL
;
7002 ssh
->packet_dispatch
[SSH2_MSG_KEX_DH_GEX_REPLY
] = NULL
;
7003 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_REQUEST
] = NULL
;
7004 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_FAILURE
] = NULL
;
7005 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_SUCCESS
] = NULL
;
7006 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_BANNER
] = NULL
;
7007 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_PK_OK
] = NULL
;
7008 /* ssh->packet_dispatch[SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ] = NULL; duplicate case value */
7009 /* ssh->packet_dispatch[SSH2_MSG_USERAUTH_INFO_REQUEST] = NULL; duplicate case value */
7010 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_INFO_RESPONSE
] = NULL
;
7011 ssh
->packet_dispatch
[SSH2_MSG_GLOBAL_REQUEST
] = NULL
;
7012 ssh
->packet_dispatch
[SSH2_MSG_REQUEST_SUCCESS
] = NULL
;
7013 ssh
->packet_dispatch
[SSH2_MSG_REQUEST_FAILURE
] = NULL
;
7014 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN
] = NULL
;
7015 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
] = NULL
;
7016 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_FAILURE
] = NULL
;
7017 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_WINDOW_ADJUST
] = NULL
;
7018 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_DATA
] = NULL
;
7019 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EXTENDED_DATA
] = NULL
;
7020 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EOF
] = NULL
;
7021 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_CLOSE
] = NULL
;
7022 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_REQUEST
] = NULL
;
7023 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_SUCCESS
] = NULL
;
7024 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_FAILURE
] = NULL
;
7027 * These special message types we install handlers for.
7029 ssh
->packet_dispatch
[SSH2_MSG_DISCONNECT
] = ssh2_msg_disconnect
;
7030 ssh
->packet_dispatch
[SSH2_MSG_IGNORE
] = ssh_msg_ignore
; /* shared with ssh1 */
7031 ssh
->packet_dispatch
[SSH2_MSG_DEBUG
] = ssh2_msg_debug
;
7034 static void ssh2_timer(void *ctx
, long now
)
7038 if (!ssh
->kex_in_progress
&&
7039 now
- ssh
->next_rekey
>= 0) {
7040 do_ssh2_transport(ssh
, "Initiating key re-exchange (timeout)",
7045 static void ssh2_protocol(Ssh ssh
, unsigned char *in
, int inlen
,
7046 struct Packet
*pktin
)
7048 if (ssh
->state
== SSH_STATE_CLOSED
)
7052 ssh
->incoming_data_size
+= pktin
->encrypted_len
;
7053 if (!ssh
->kex_in_progress
&&
7054 ssh
->incoming_data_size
> MAX_DATA_BEFORE_REKEY
)
7055 do_ssh2_transport(ssh
, "Initiating key re-exchange "
7056 "(too much data received)", -1, NULL
);
7059 if (pktin
&& ssh
->packet_dispatch
[pktin
->type
]) {
7060 ssh
->packet_dispatch
[pktin
->type
](ssh
, pktin
);
7064 if (!ssh
->protocol_initial_phase_done
||
7065 (pktin
&& pktin
->type
>= 20 && pktin
->type
< 50)) {
7066 if (do_ssh2_transport(ssh
, in
, inlen
, pktin
) &&
7067 !ssh
->protocol_initial_phase_done
) {
7068 ssh
->protocol_initial_phase_done
= TRUE
;
7070 * Allow authconn to initialise itself.
7072 do_ssh2_authconn(ssh
, NULL
, 0, NULL
);
7075 do_ssh2_authconn(ssh
, in
, inlen
, pktin
);
7080 * Called to set up the connection.
7082 * Returns an error message, or NULL on success.
7084 static const char *ssh_init(void *frontend_handle
, void **backend_handle
,
7086 char *host
, int port
, char **realhost
, int nodelay
,
7092 ssh
= snew(struct ssh_tag
);
7093 ssh
->cfg
= *cfg
; /* STRUCTURE COPY */
7094 ssh
->version
= 0; /* when not ready yet */
7097 ssh
->v1_cipher_ctx
= NULL
;
7098 ssh
->crcda_ctx
= NULL
;
7099 ssh
->cscipher
= NULL
;
7100 ssh
->cs_cipher_ctx
= NULL
;
7101 ssh
->sccipher
= NULL
;
7102 ssh
->sc_cipher_ctx
= NULL
;
7104 ssh
->cs_mac_ctx
= NULL
;
7106 ssh
->sc_mac_ctx
= NULL
;
7108 ssh
->cs_comp_ctx
= NULL
;
7110 ssh
->sc_comp_ctx
= NULL
;
7112 ssh
->kex_ctx
= NULL
;
7113 ssh
->hostkey
= NULL
;
7115 ssh
->state
= SSH_STATE_PREPACKET
;
7116 ssh
->size_needed
= FALSE
;
7117 ssh
->eof_needed
= FALSE
;
7120 ssh
->deferred_send_data
= NULL
;
7121 ssh
->deferred_len
= 0;
7122 ssh
->deferred_size
= 0;
7123 ssh
->fallback_cmd
= 0;
7125 ssh
->x11auth
= NULL
;
7126 ssh
->v1_compressing
= FALSE
;
7127 ssh
->v2_outgoing_sequence
= 0;
7128 ssh
->ssh1_rdpkt_crstate
= 0;
7129 ssh
->ssh2_rdpkt_crstate
= 0;
7130 ssh
->do_ssh_init_crstate
= 0;
7131 ssh
->ssh_gotdata_crstate
= 0;
7132 ssh
->do_ssh1_connection_crstate
= 0;
7133 ssh
->do_ssh1_login_crstate
= 0;
7134 ssh
->do_ssh2_transport_crstate
= 0;
7135 ssh
->do_ssh2_authconn_crstate
= 0;
7136 ssh
->do_ssh_init_state
= NULL
;
7137 ssh
->do_ssh1_login_state
= NULL
;
7138 ssh
->do_ssh2_transport_state
= NULL
;
7139 ssh
->do_ssh2_authconn_state
= NULL
;
7140 ssh
->mainchan
= NULL
;
7141 ssh
->throttled_all
= 0;
7142 ssh
->v1_stdout_throttling
= 0;
7144 ssh
->queuelen
= ssh
->queuesize
= 0;
7145 ssh
->queueing
= FALSE
;
7147 *backend_handle
= ssh
;
7150 if (crypto_startup() == 0)
7151 return "Microsoft high encryption pack not installed!";
7154 ssh
->frontend
= frontend_handle
;
7155 ssh
->term_width
= ssh
->cfg
.width
;
7156 ssh
->term_height
= ssh
->cfg
.height
;
7158 ssh
->channels
= NULL
;
7159 ssh
->rportfwds
= NULL
;
7164 ssh
->v1_throttle_count
= 0;
7165 ssh
->overall_bufsize
= 0;
7166 ssh
->fallback_cmd
= 0;
7168 ssh
->protocol
= NULL
;
7170 ssh
->protocol_initial_phase_done
= FALSE
;
7174 ssh
->incoming_data_size
= ssh
->outgoing_data_size
=
7175 ssh
->deferred_data_size
= 0L;
7176 ssh
->kex_in_progress
= FALSE
;
7178 p
= connect_to_host(ssh
, host
, port
, realhost
, nodelay
, keepalive
);
7187 static void ssh_free(void *handle
)
7189 Ssh ssh
= (Ssh
) handle
;
7190 struct ssh_channel
*c
;
7191 struct ssh_rportfwd
*pf
;
7193 if (ssh
->v1_cipher_ctx
)
7194 ssh
->cipher
->free_context(ssh
->v1_cipher_ctx
);
7195 if (ssh
->cs_cipher_ctx
)
7196 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
7197 if (ssh
->sc_cipher_ctx
)
7198 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
7199 if (ssh
->cs_mac_ctx
)
7200 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
7201 if (ssh
->sc_mac_ctx
)
7202 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
7203 if (ssh
->cs_comp_ctx
) {
7205 ssh
->cscomp
->compress_cleanup(ssh
->cs_comp_ctx
);
7207 zlib_compress_cleanup(ssh
->cs_comp_ctx
);
7209 if (ssh
->sc_comp_ctx
) {
7211 ssh
->sccomp
->decompress_cleanup(ssh
->sc_comp_ctx
);
7213 zlib_decompress_cleanup(ssh
->sc_comp_ctx
);
7216 dh_cleanup(ssh
->kex_ctx
);
7217 sfree(ssh
->savedhost
);
7219 while (ssh
->queuelen
-- > 0)
7220 ssh_free_packet(ssh
->queue
[ssh
->queuelen
]);
7223 if (ssh
->channels
) {
7224 while ((c
= delpos234(ssh
->channels
, 0)) != NULL
) {
7227 if (c
->u
.x11
.s
!= NULL
)
7228 x11_close(c
->u
.x11
.s
);
7231 if (c
->u
.pfd
.s
!= NULL
)
7232 pfd_close(c
->u
.pfd
.s
);
7237 freetree234(ssh
->channels
);
7238 ssh
->channels
= NULL
;
7241 if (ssh
->rportfwds
) {
7242 while ((pf
= delpos234(ssh
->rportfwds
, 0)) != NULL
)
7244 freetree234(ssh
->rportfwds
);
7245 ssh
->rportfwds
= NULL
;
7247 sfree(ssh
->deferred_send_data
);
7249 x11_free_auth(ssh
->x11auth
);
7250 sfree(ssh
->do_ssh_init_state
);
7251 sfree(ssh
->do_ssh1_login_state
);
7252 sfree(ssh
->do_ssh2_transport_state
);
7253 sfree(ssh
->do_ssh2_authconn_state
);
7254 if (ssh
->crcda_ctx
) {
7255 crcda_free_context(ssh
->crcda_ctx
);
7256 ssh
->crcda_ctx
= NULL
;
7260 expire_timer_context(ssh
);
7262 pinger_free(ssh
->pinger
);
7269 * Reconfigure the SSH backend.
7271 * Currently, this function does nothing very useful. In future,
7272 * however, we could do some handy things with it. For example, we
7273 * could make the port forwarding configurer active in the Change
7274 * Settings box, and this routine could close down existing
7275 * forwardings and open up new ones in response to changes.
7277 static void ssh_reconfig(void *handle
, Config
*cfg
)
7279 Ssh ssh
= (Ssh
) handle
;
7280 pinger_reconfig(ssh
->pinger
, &ssh
->cfg
, cfg
);
7281 ssh
->cfg
= *cfg
; /* STRUCTURE COPY */
7285 * Called to send data down the Telnet connection.
7287 static int ssh_send(void *handle
, char *buf
, int len
)
7289 Ssh ssh
= (Ssh
) handle
;
7291 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
7294 ssh
->protocol(ssh
, (unsigned char *)buf
, len
, 0);
7296 return ssh_sendbuffer(ssh
);
7300 * Called to query the current amount of buffered stdin data.
7302 static int ssh_sendbuffer(void *handle
)
7304 Ssh ssh
= (Ssh
) handle
;
7307 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
7311 * If the SSH socket itself has backed up, add the total backup
7312 * size on that to any individual buffer on the stdin channel.
7315 if (ssh
->throttled_all
)
7316 override_value
= ssh
->overall_bufsize
;
7318 if (ssh
->version
== 1) {
7319 return override_value
;
7320 } else if (ssh
->version
== 2) {
7321 if (!ssh
->mainchan
|| ssh
->mainchan
->closes
> 0)
7322 return override_value
;
7324 return (override_value
+
7325 bufchain_size(&ssh
->mainchan
->v
.v2
.outbuffer
));
7332 * Called to set the size of the window from SSH's POV.
7334 static void ssh_size(void *handle
, int width
, int height
)
7336 Ssh ssh
= (Ssh
) handle
;
7337 struct Packet
*pktout
;
7339 ssh
->term_width
= width
;
7340 ssh
->term_height
= height
;
7342 switch (ssh
->state
) {
7343 case SSH_STATE_BEFORE_SIZE
:
7344 case SSH_STATE_PREPACKET
:
7345 case SSH_STATE_CLOSED
:
7346 break; /* do nothing */
7347 case SSH_STATE_INTERMED
:
7348 ssh
->size_needed
= TRUE
; /* buffer for later */
7350 case SSH_STATE_SESSION
:
7351 if (!ssh
->cfg
.nopty
) {
7352 if (ssh
->version
== 1) {
7353 send_packet(ssh
, SSH1_CMSG_WINDOW_SIZE
,
7354 PKT_INT
, ssh
->term_height
,
7355 PKT_INT
, ssh
->term_width
,
7356 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
7357 } else if (ssh
->mainchan
) {
7358 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7359 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
7360 ssh2_pkt_addstring(pktout
, "window-change");
7361 ssh2_pkt_addbool(pktout
, 0);
7362 ssh2_pkt_adduint32(pktout
, ssh
->term_width
);
7363 ssh2_pkt_adduint32(pktout
, ssh
->term_height
);
7364 ssh2_pkt_adduint32(pktout
, 0);
7365 ssh2_pkt_adduint32(pktout
, 0);
7366 ssh2_pkt_send(ssh
, pktout
);
7374 * Return a list of the special codes that make sense in this
7377 static const struct telnet_special
*ssh_get_specials(void *handle
)
7379 static const struct telnet_special ignore_special
[] = {
7380 {"IGNORE message", TS_NOP
},
7381 {"Repeat key exchange", TS_REKEY
},
7383 static const struct telnet_special ssh2_session_specials
[] = {
7386 /* These are the signal names defined by draft-ietf-secsh-connect-19.
7387 * They include all the ISO C signals, but are a subset of the POSIX
7388 * required signals. */
7389 {"SIGINT (Interrupt)", TS_SIGINT
},
7390 {"SIGTERM (Terminate)", TS_SIGTERM
},
7391 {"SIGKILL (Kill)", TS_SIGKILL
},
7392 {"SIGQUIT (Quit)", TS_SIGQUIT
},
7393 {"SIGHUP (Hangup)", TS_SIGHUP
},
7394 {"More signals", TS_SUBMENU
},
7395 {"SIGABRT", TS_SIGABRT
}, {"SIGALRM", TS_SIGALRM
},
7396 {"SIGFPE", TS_SIGFPE
}, {"SIGILL", TS_SIGILL
},
7397 {"SIGPIPE", TS_SIGPIPE
}, {"SIGSEGV", TS_SIGSEGV
},
7398 {"SIGUSR1", TS_SIGUSR1
}, {"SIGUSR2", TS_SIGUSR2
},
7401 static const struct telnet_special specials_end
[] = {
7404 static struct telnet_special ssh_specials
[lenof(ignore_special
) +
7405 lenof(ssh2_session_specials
) +
7406 lenof(specials_end
)];
7407 Ssh ssh
= (Ssh
) handle
;
7409 #define ADD_SPECIALS(name) \
7411 assert((i + lenof(name)) <= lenof(ssh_specials)); \
7412 memcpy(&ssh_specials[i], name, sizeof name); \
7416 if (ssh
->version
== 1) {
7417 /* Don't bother offering IGNORE if we've decided the remote
7418 * won't cope with it, since we wouldn't bother sending it if
7420 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
))
7421 ADD_SPECIALS(ignore_special
);
7422 } else if (ssh
->version
== 2) {
7423 ADD_SPECIALS(ignore_special
);
7425 ADD_SPECIALS(ssh2_session_specials
);
7426 } /* else we're not ready yet */
7429 ADD_SPECIALS(specials_end
);
7430 return ssh_specials
;
7438 * Send Telnet special codes. TS_EOF is useful for `plink', so you
7439 * can send an EOF and collect resulting output (e.g. `plink
7442 static void ssh_special(void *handle
, Telnet_Special code
)
7444 Ssh ssh
= (Ssh
) handle
;
7445 struct Packet
*pktout
;
7447 if (code
== TS_EOF
) {
7448 if (ssh
->state
!= SSH_STATE_SESSION
) {
7450 * Buffer the EOF in case we are pre-SESSION, so we can
7451 * send it as soon as we reach SESSION.
7454 ssh
->eof_needed
= TRUE
;
7457 if (ssh
->version
== 1) {
7458 send_packet(ssh
, SSH1_CMSG_EOF
, PKT_END
);
7459 } else if (ssh
->mainchan
) {
7460 struct Packet
*pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF
);
7461 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
7462 ssh2_pkt_send(ssh
, pktout
);
7464 logevent("Sent EOF message");
7465 } else if (code
== TS_PING
|| code
== TS_NOP
) {
7466 if (ssh
->state
== SSH_STATE_CLOSED
7467 || ssh
->state
== SSH_STATE_PREPACKET
) return;
7468 if (ssh
->version
== 1) {
7469 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
))
7470 send_packet(ssh
, SSH1_MSG_IGNORE
, PKT_STR
, "", PKT_END
);
7472 pktout
= ssh2_pkt_init(SSH2_MSG_IGNORE
);
7473 ssh2_pkt_addstring_start(pktout
);
7474 ssh2_pkt_send_noqueue(ssh
, pktout
);
7476 } else if (code
== TS_REKEY
) {
7477 if (!ssh
->kex_in_progress
&& ssh
->version
== 2) {
7478 do_ssh2_transport(ssh
, "Initiating key re-exchange at"
7479 " user request", -1, NULL
);
7481 } else if (code
== TS_BRK
) {
7482 if (ssh
->state
== SSH_STATE_CLOSED
7483 || ssh
->state
== SSH_STATE_PREPACKET
) return;
7484 if (ssh
->version
== 1) {
7485 logevent("Unable to send BREAK signal in SSH1");
7486 } else if (ssh
->mainchan
) {
7487 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7488 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
7489 ssh2_pkt_addstring(pktout
, "break");
7490 ssh2_pkt_addbool(pktout
, 0);
7491 ssh2_pkt_adduint32(pktout
, 0); /* default break length */
7492 ssh2_pkt_send(ssh
, pktout
);
7495 /* Is is a POSIX signal? */
7496 char *signame
= NULL
;
7497 if (code
== TS_SIGABRT
) signame
= "ABRT";
7498 if (code
== TS_SIGALRM
) signame
= "ALRM";
7499 if (code
== TS_SIGFPE
) signame
= "FPE";
7500 if (code
== TS_SIGHUP
) signame
= "HUP";
7501 if (code
== TS_SIGILL
) signame
= "ILL";
7502 if (code
== TS_SIGINT
) signame
= "INT";
7503 if (code
== TS_SIGKILL
) signame
= "KILL";
7504 if (code
== TS_SIGPIPE
) signame
= "PIPE";
7505 if (code
== TS_SIGQUIT
) signame
= "QUIT";
7506 if (code
== TS_SIGSEGV
) signame
= "SEGV";
7507 if (code
== TS_SIGTERM
) signame
= "TERM";
7508 if (code
== TS_SIGUSR1
) signame
= "USR1";
7509 if (code
== TS_SIGUSR2
) signame
= "USR2";
7510 /* The SSH-2 protocol does in principle support arbitrary named
7511 * signals, including signame@domain, but we don't support those. */
7513 /* It's a signal. */
7514 if (ssh
->version
== 2 && ssh
->mainchan
) {
7515 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7516 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
7517 ssh2_pkt_addstring(pktout
, "signal");
7518 ssh2_pkt_addbool(pktout
, 0);
7519 ssh2_pkt_addstring(pktout
, signame
);
7520 ssh2_pkt_send(ssh
, pktout
);
7521 logeventf(ssh
, "Sent signal SIG%s", signame
);
7524 /* Never heard of it. Do nothing */
7529 void *new_sock_channel(void *handle
, Socket s
)
7531 Ssh ssh
= (Ssh
) handle
;
7532 struct ssh_channel
*c
;
7533 c
= snew(struct ssh_channel
);
7537 c
->remoteid
= -1; /* to be set when open confirmed */
7538 c
->localid
= alloc_channel_id(ssh
);
7540 c
->type
= CHAN_SOCKDATA_DORMANT
;/* identify channel type */
7542 bufchain_init(&c
->v
.v2
.outbuffer
);
7543 add234(ssh
->channels
, c
);
7549 * This is called when stdout/stderr (the entity to which
7550 * from_backend sends data) manages to clear some backlog.
7552 static void ssh_unthrottle(void *handle
, int bufsize
)
7554 Ssh ssh
= (Ssh
) handle
;
7555 if (ssh
->version
== 1) {
7556 if (ssh
->v1_stdout_throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
7557 ssh
->v1_stdout_throttling
= 0;
7558 ssh1_throttle(ssh
, -1);
7561 if (ssh
->mainchan
&& ssh
->mainchan
->closes
== 0)
7562 ssh2_set_window(ssh
->mainchan
, OUR_V2_WINSIZE
- bufsize
);
7566 void ssh_send_port_open(void *channel
, char *hostname
, int port
, char *org
)
7568 struct ssh_channel
*c
= (struct ssh_channel
*)channel
;
7570 struct Packet
*pktout
;
7572 logeventf(ssh
, "Opening forwarded connection to %s:%d", hostname
, port
);
7574 if (ssh
->version
== 1) {
7575 send_packet(ssh
, SSH1_MSG_PORT_OPEN
,
7576 PKT_INT
, c
->localid
,
7579 //PKT_STR, <org:orgport>,
7582 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
7583 ssh2_pkt_addstring(pktout
, "direct-tcpip");
7584 ssh2_pkt_adduint32(pktout
, c
->localid
);
7585 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
7586 ssh2_pkt_adduint32(pktout
, c
->v
.v2
.locwindow
);/* our window size */
7587 ssh2_pkt_adduint32(pktout
, 0x4000UL
); /* our max pkt size */
7588 ssh2_pkt_addstring(pktout
, hostname
);
7589 ssh2_pkt_adduint32(pktout
, port
);
7591 * We make up values for the originator data; partly it's
7592 * too much hassle to keep track, and partly I'm not
7593 * convinced the server should be told details like that
7594 * about my local network configuration.
7596 ssh2_pkt_addstring(pktout
, "client-side-connection");
7597 ssh2_pkt_adduint32(pktout
, 0);
7598 ssh2_pkt_send(ssh
, pktout
);
7602 static Socket
ssh_socket(void *handle
)
7604 Ssh ssh
= (Ssh
) handle
;
7608 static int ssh_sendok(void *handle
)
7610 Ssh ssh
= (Ssh
) handle
;
7611 return ssh
->send_ok
;
7614 static int ssh_ldisc(void *handle
, int option
)
7616 Ssh ssh
= (Ssh
) handle
;
7617 if (option
== LD_ECHO
)
7618 return ssh
->echoing
;
7619 if (option
== LD_EDIT
)
7620 return ssh
->editing
;
7624 static void ssh_provide_ldisc(void *handle
, void *ldisc
)
7626 Ssh ssh
= (Ssh
) handle
;
7630 static void ssh_provide_logctx(void *handle
, void *logctx
)
7632 Ssh ssh
= (Ssh
) handle
;
7633 ssh
->logctx
= logctx
;
7636 static int ssh_return_exitcode(void *handle
)
7638 Ssh ssh
= (Ssh
) handle
;
7642 return (ssh
->exitcode
>= 0 ? ssh
->exitcode
: 0);
7646 * Gross hack: pscp will try to start SFTP but fall back to scp1 if
7647 * that fails. This variable is the means by which scp.c can reach
7648 * into the SSH code and find out which one it got.
7650 extern int ssh_fallback_cmd(void *handle
)
7652 Ssh ssh
= (Ssh
) handle
;
7653 return ssh
->fallback_cmd
;
7656 Backend ssh_backend
= {
7666 ssh_return_exitcode
,