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 enum { PKT_END
, PKT_INT
, PKT_CHAR
, PKT_DATA
, PKT_STR
, PKT_BIGNUM
};
273 * Coroutine mechanics for the sillier bits of the code. If these
274 * macros look impenetrable to you, you might find it helpful to
277 * http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
279 * which explains the theory behind these macros.
281 * In particular, if you are getting `case expression not constant'
282 * errors when building with MS Visual Studio, this is because MS's
283 * Edit and Continue debugging feature causes their compiler to
284 * violate ANSI C. To disable Edit and Continue debugging:
286 * - right-click ssh.c in the FileView
288 * - select the C/C++ tab and the General category
289 * - under `Debug info:', select anything _other_ than `Program
290 * Database for Edit and Continue'.
292 #define crBegin(v) { int *crLine = &v; switch(v) { case 0:;
295 if (!ssh->t) ssh->t = snew(struct t); \
297 #define crFinish(z) } *crLine = 0; return (z); }
298 #define crFinishV } *crLine = 0; return; }
299 #define crReturn(z) \
301 *crLine =__LINE__; return (z); case __LINE__:;\
305 *crLine=__LINE__; return; case __LINE__:;\
307 #define crStop(z) do{ *crLine = 0; return (z); }while(0)
308 #define crStopV do{ *crLine = 0; return; }while(0)
309 #define crWaitUntil(c) do { crReturn(0); } while (!(c))
310 #define crWaitUntilV(c) do { crReturnV; } while (!(c))
312 typedef struct ssh_tag
*Ssh
;
314 static void ssh2_pkt_init(Ssh
, int pkt_type
);
315 static void ssh2_pkt_addbool(Ssh
, unsigned char value
);
316 static void ssh2_pkt_adduint32(Ssh
, unsigned long value
);
317 static void ssh2_pkt_addstring_start(Ssh
);
318 static void ssh2_pkt_addstring_str(Ssh
, char *data
);
319 static void ssh2_pkt_addstring_data(Ssh
, char *data
, int len
);
320 static void ssh2_pkt_addstring(Ssh
, char *data
);
321 static unsigned char *ssh2_mpint_fmt(Bignum b
, int *len
);
322 static void ssh2_pkt_addmp(Ssh
, Bignum b
);
323 static int ssh2_pkt_construct(Ssh
);
324 static void ssh2_pkt_send(Ssh
);
325 static int do_ssh1_login(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
);
326 static void do_ssh2_authconn(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
);
329 * Buffer management constants. There are several of these for
330 * various different purposes:
332 * - SSH1_BUFFER_LIMIT is the amount of backlog that must build up
333 * on a local data stream before we throttle the whole SSH
334 * connection (in SSH1 only). Throttling the whole connection is
335 * pretty drastic so we set this high in the hope it won't
338 * - SSH_MAX_BACKLOG is the amount of backlog that must build up
339 * on the SSH connection itself before we defensively throttle
340 * _all_ local data streams. This is pretty drastic too (though
341 * thankfully unlikely in SSH2 since the window mechanism should
342 * ensure that the server never has any need to throttle its end
343 * of the connection), so we set this high as well.
345 * - OUR_V2_WINSIZE is the maximum window size we present on SSH2
349 #define SSH1_BUFFER_LIMIT 32768
350 #define SSH_MAX_BACKLOG 32768
351 #define OUR_V2_WINSIZE 16384
353 const static struct ssh_kex
*kex_algs
[] = {
354 &ssh_diffiehellman_gex
,
358 const static struct ssh_signkey
*hostkey_algs
[] = { &ssh_rsa
, &ssh_dss
};
360 static void *nullmac_make_context(void)
364 static void nullmac_free_context(void *handle
)
367 static void nullmac_key(void *handle
, unsigned char *key
)
370 static void nullmac_generate(void *handle
, unsigned char *blk
, int len
,
374 static int nullmac_verify(void *handle
, unsigned char *blk
, int len
,
379 const static struct ssh_mac ssh_mac_none
= {
380 nullmac_make_context
, nullmac_free_context
, nullmac_key
,
381 nullmac_generate
, nullmac_verify
, "none", 0
383 const static struct ssh_mac
*macs
[] = {
384 &ssh_sha1
, &ssh_md5
, &ssh_mac_none
386 const static struct ssh_mac
*buggymacs
[] = {
387 &ssh_sha1_buggy
, &ssh_md5
, &ssh_mac_none
390 static void *ssh_comp_none_init(void)
394 static void ssh_comp_none_cleanup(void *handle
)
397 static int ssh_comp_none_block(void *handle
, unsigned char *block
, int len
,
398 unsigned char **outblock
, int *outlen
)
402 static int ssh_comp_none_disable(void *handle
)
406 const static struct ssh_compress ssh_comp_none
= {
408 ssh_comp_none_init
, ssh_comp_none_cleanup
, ssh_comp_none_block
,
409 ssh_comp_none_init
, ssh_comp_none_cleanup
, ssh_comp_none_block
,
410 ssh_comp_none_disable
, NULL
412 extern const struct ssh_compress ssh_zlib
;
413 const static struct ssh_compress
*compressions
[] = {
414 &ssh_zlib
, &ssh_comp_none
417 enum { /* channel types */
422 CHAN_SOCKDATA_DORMANT
/* one the remote hasn't confirmed */
426 * 2-3-4 tree storing channels.
429 Ssh ssh
; /* pointer back to main context */
430 unsigned remoteid
, localid
;
433 * In SSH1, this value contains four bits:
435 * 1 We have sent SSH1_MSG_CHANNEL_CLOSE.
436 * 2 We have sent SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION.
437 * 4 We have received SSH1_MSG_CHANNEL_CLOSE.
438 * 8 We have received SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION.
440 * A channel is completely finished with when all four bits are set.
444 struct ssh1_data_channel
{
447 struct ssh2_data_channel
{
449 unsigned remwindow
, remmaxpkt
;
454 struct ssh_agent_channel
{
455 unsigned char *message
;
456 unsigned char msglen
[4];
457 int lensofar
, totallen
;
459 struct ssh_x11_channel
{
462 struct ssh_pfd_channel
{
469 * 2-3-4 tree storing remote->local port forwardings. SSH 1 and SSH
470 * 2 use this structure in different ways, reflecting SSH 2's
471 * altogether saner approach to port forwarding.
473 * In SSH 1, you arrange a remote forwarding by sending the server
474 * the remote port number, and the local destination host:port.
475 * When a connection comes in, the server sends you back that
476 * host:port pair, and you connect to it. This is a ready-made
477 * security hole if you're not on the ball: a malicious server
478 * could send you back _any_ host:port pair, so if you trustingly
479 * connect to the address it gives you then you've just opened the
480 * entire inside of your corporate network just by connecting
481 * through it to a dodgy SSH server. Hence, we must store a list of
482 * host:port pairs we _are_ trying to forward to, and reject a
483 * connection request from the server if it's not in the list.
485 * In SSH 2, each side of the connection minds its own business and
486 * doesn't send unnecessary information to the other. You arrange a
487 * remote forwarding by sending the server just the remote port
488 * number. When a connection comes in, the server tells you which
489 * of its ports was connected to; and _you_ have to remember what
490 * local host:port pair went with that port number.
492 * Hence: in SSH 1 this structure stores host:port pairs we intend
493 * to allow connections to, and is indexed by those host:port
494 * pairs. In SSH 2 it stores a mapping from source port to
495 * destination host:port pair, and is indexed by source port.
497 struct ssh_rportfwd
{
498 unsigned sport
, dport
;
511 static void ssh1_protocol(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
);
512 static void ssh2_protocol(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
);
513 static void ssh_size(void *handle
, int width
, int height
);
514 static void ssh_special(void *handle
, Telnet_Special
);
515 static int ssh2_try_send(struct ssh_channel
*c
);
516 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
, int len
);
517 static void ssh_throttle_all(Ssh ssh
, int enable
, int bufsize
);
518 static void ssh2_set_window(struct ssh_channel
*c
, unsigned newwin
);
519 static int ssh_sendbuffer(void *handle
);
520 static void ssh_do_close(Ssh ssh
);
522 struct rdpkt1_state_tag
{
523 long len
, pad
, biglen
, to_read
;
524 unsigned long realcrc
, gotcrc
;
530 struct rdpkt2_state_tag
{
531 long len
, pad
, payload
, packetlen
, maclen
;
534 unsigned long incoming_sequence
;
538 const struct plug_function_table
*fn
;
539 /* the above field _must_ be first in the structure */
541 SHA_State exhash
, exhashbase
;
548 unsigned char session_key
[32];
550 int v1_remote_protoflags
;
551 int v1_local_protoflags
;
552 int agentfwd_enabled
;
555 const struct ssh_cipher
*cipher
;
558 const struct ssh2_cipher
*cscipher
, *sccipher
;
559 void *cs_cipher_ctx
, *sc_cipher_ctx
;
560 const struct ssh_mac
*csmac
, *scmac
;
561 void *cs_mac_ctx
, *sc_mac_ctx
;
562 const struct ssh_compress
*cscomp
, *sccomp
;
563 void *cs_comp_ctx
, *sc_comp_ctx
;
564 const struct ssh_kex
*kex
;
565 const struct ssh_signkey
*hostkey
;
566 unsigned char v2_session_id
[20];
572 int echoing
, editing
;
576 int ospeed
, ispeed
; /* temporaries */
577 int term_width
, term_height
;
579 tree234
*channels
; /* indexed by local id */
580 struct ssh_channel
*mainchan
; /* primary session channel */
587 SSH_STATE_BEFORE_SIZE
,
593 int size_needed
, eof_needed
;
596 struct Packet pktout
;
597 unsigned char *deferred_send_data
;
598 int deferred_len
, deferred_size
;
601 * Gross hack: pscp will try to start SFTP but fall back to
602 * scp1 if that fails. This variable is the means by which
603 * scp.c can reach into the SSH code and find out which one it
609 * Used for username and password input.
611 char *userpass_input_buffer
;
612 int userpass_input_buflen
;
613 int userpass_input_bufpos
;
614 int userpass_input_echo
;
616 char *portfwd_strptr
;
622 int v1_throttle_count
;
625 int v1_stdout_throttling
;
626 int v2_outgoing_sequence
;
628 int ssh1_rdpkt_crstate
;
629 int ssh2_rdpkt_crstate
;
630 int do_ssh_init_crstate
;
631 int ssh_gotdata_crstate
;
632 int ssh1_protocol_crstate
;
633 int do_ssh1_login_crstate
;
634 int do_ssh2_transport_crstate
;
635 int do_ssh2_authconn_crstate
;
637 void *do_ssh_init_state
;
638 void *do_ssh1_login_state
;
639 void *do_ssh2_transport_state
;
640 void *do_ssh2_authconn_state
;
642 struct rdpkt1_state_tag rdpkt1_state
;
643 struct rdpkt2_state_tag rdpkt2_state
;
645 void (*protocol
) (Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
);
646 int (*s_rdpkt
) (Ssh ssh
, unsigned char **data
, int *datalen
);
649 * We maintain a full _copy_ of a Config structure here, not
650 * merely a pointer to it. That way, when we're passed a new
651 * one for reconfiguration, we can check the differences and
652 * potentially reconfigure port forwardings etc in mid-session.
657 * Used to transfer data back from async agent callbacks.
659 void *agent_response
;
660 int agent_response_len
;
663 #define logevent(s) logevent(ssh->frontend, s)
665 /* logevent, only printf-formatted. */
666 static void logeventf(Ssh ssh
, const char *fmt
, ...)
672 buf
= dupvprintf(fmt
, ap
);
678 #define bombout(msg) \
680 char *text = dupprintf msg; \
683 connection_fatal(ssh->frontend, "%s", text); \
687 static int ssh_channelcmp(void *av
, void *bv
)
689 struct ssh_channel
*a
= (struct ssh_channel
*) av
;
690 struct ssh_channel
*b
= (struct ssh_channel
*) bv
;
691 if (a
->localid
< b
->localid
)
693 if (a
->localid
> b
->localid
)
697 static int ssh_channelfind(void *av
, void *bv
)
699 unsigned *a
= (unsigned *) av
;
700 struct ssh_channel
*b
= (struct ssh_channel
*) bv
;
708 static int ssh_rportcmp_ssh1(void *av
, void *bv
)
710 struct ssh_rportfwd
*a
= (struct ssh_rportfwd
*) av
;
711 struct ssh_rportfwd
*b
= (struct ssh_rportfwd
*) bv
;
713 if ( (i
= strcmp(a
->dhost
, b
->dhost
)) != 0)
714 return i
< 0 ?
-1 : +1;
715 if (a
->dport
> b
->dport
)
717 if (a
->dport
< b
->dport
)
722 static int ssh_rportcmp_ssh2(void *av
, void *bv
)
724 struct ssh_rportfwd
*a
= (struct ssh_rportfwd
*) av
;
725 struct ssh_rportfwd
*b
= (struct ssh_rportfwd
*) bv
;
727 if (a
->sport
> b
->sport
)
729 if (a
->sport
< b
->sport
)
734 static int alloc_channel_id(Ssh ssh
)
736 const unsigned CHANNEL_NUMBER_OFFSET
= 256;
737 unsigned low
, high
, mid
;
739 struct ssh_channel
*c
;
742 * First-fit allocation of channel numbers: always pick the
743 * lowest unused one. To do this, binary-search using the
744 * counted B-tree to find the largest channel ID which is in a
745 * contiguous sequence from the beginning. (Precisely
746 * everything in that sequence must have ID equal to its tree
747 * index plus CHANNEL_NUMBER_OFFSET.)
749 tsize
= count234(ssh
->channels
);
753 while (high
- low
> 1) {
754 mid
= (high
+ low
) / 2;
755 c
= index234(ssh
->channels
, mid
);
756 if (c
->localid
== mid
+ CHANNEL_NUMBER_OFFSET
)
757 low
= mid
; /* this one is fine */
759 high
= mid
; /* this one is past it */
762 * Now low points to either -1, or the tree index of the
763 * largest ID in the initial sequence.
766 unsigned i
= low
+ 1 + CHANNEL_NUMBER_OFFSET
;
767 assert(NULL
== find234(ssh
->channels
, &i
, ssh_channelfind
));
769 return low
+ 1 + CHANNEL_NUMBER_OFFSET
;
772 static void c_write(Ssh ssh
, const char *buf
, int len
)
774 if ((flags
& FLAG_STDERR
)) {
776 for (i
= 0; i
< len
; i
++)
778 fputc(buf
[i
], stderr
);
781 from_backend(ssh
->frontend
, 1, buf
, len
);
784 static void c_write_untrusted(Ssh ssh
, const char *buf
, int len
)
787 for (i
= 0; i
< len
; i
++) {
789 c_write(ssh
, "\r\n", 2);
790 else if ((buf
[i
] & 0x60) || (buf
[i
] == '\r'))
791 c_write(ssh
, buf
+ i
, 1);
795 static void c_write_str(Ssh ssh
, const char *buf
)
797 c_write(ssh
, buf
, strlen(buf
));
801 * Collect incoming data in the incoming packet buffer.
802 * Decipher and verify the packet when it is completely read.
803 * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets.
804 * Update the *data and *datalen variables.
805 * Return the additional nr of bytes needed, or 0 when
806 * a complete packet is available.
808 static int ssh1_rdpkt(Ssh ssh
, unsigned char **data
, int *datalen
)
810 struct rdpkt1_state_tag
*st
= &ssh
->rdpkt1_state
;
812 crBegin(ssh
->ssh1_rdpkt_crstate
);
817 ssh
->pktin
.length
= 0;
819 for (st
->i
= st
->len
= 0; st
->i
< 4; st
->i
++) {
820 while ((*datalen
) == 0)
822 st
->len
= (st
->len
<< 8) + **data
;
823 (*data
)++, (*datalen
)--;
826 st
->pad
= 8 - (st
->len
% 8);
827 st
->biglen
= st
->len
+ st
->pad
;
828 ssh
->pktin
.length
= st
->len
- 5;
830 if (ssh
->pktin
.maxlen
< st
->biglen
) {
831 ssh
->pktin
.maxlen
= st
->biglen
;
832 ssh
->pktin
.data
= sresize(ssh
->pktin
.data
, st
->biglen
+ APIEXTRA
,
836 st
->to_read
= st
->biglen
;
837 st
->p
= ssh
->pktin
.data
;
838 while (st
->to_read
> 0) {
839 st
->chunk
= st
->to_read
;
840 while ((*datalen
) == 0)
841 crReturn(st
->to_read
);
842 if (st
->chunk
> (*datalen
))
843 st
->chunk
= (*datalen
);
844 memcpy(st
->p
, *data
, st
->chunk
);
846 *datalen
-= st
->chunk
;
848 st
->to_read
-= st
->chunk
;
851 if (ssh
->cipher
&& detect_attack(ssh
->crcda_ctx
, ssh
->pktin
.data
,
853 bombout(("Network attack (CRC compensation) detected!"));
858 ssh
->cipher
->decrypt(ssh
->v1_cipher_ctx
, ssh
->pktin
.data
, st
->biglen
);
860 st
->realcrc
= crc32_compute(ssh
->pktin
.data
, st
->biglen
- 4);
861 st
->gotcrc
= GET_32BIT(ssh
->pktin
.data
+ st
->biglen
- 4);
862 if (st
->gotcrc
!= st
->realcrc
) {
863 bombout(("Incorrect CRC received on packet"));
867 ssh
->pktin
.body
= ssh
->pktin
.data
+ st
->pad
+ 1;
869 if (ssh
->v1_compressing
) {
870 unsigned char *decompblk
;
872 if (!zlib_decompress_block(ssh
->sc_comp_ctx
,
873 ssh
->pktin
.body
- 1, ssh
->pktin
.length
+ 1,
874 &decompblk
, &decomplen
)) {
875 bombout(("Zlib decompression encountered invalid data"));
879 if (ssh
->pktin
.maxlen
< st
->pad
+ decomplen
) {
880 ssh
->pktin
.maxlen
= st
->pad
+ decomplen
;
881 ssh
->pktin
.data
= sresize(ssh
->pktin
.data
,
882 ssh
->pktin
.maxlen
+ APIEXTRA
,
884 ssh
->pktin
.body
= ssh
->pktin
.data
+ st
->pad
+ 1;
887 memcpy(ssh
->pktin
.body
- 1, decompblk
, decomplen
);
889 ssh
->pktin
.length
= decomplen
- 1;
892 ssh
->pktin
.type
= ssh
->pktin
.body
[-1];
895 log_packet(ssh
->logctx
,
896 PKT_INCOMING
, ssh
->pktin
.type
,
897 ssh1_pkt_type(ssh
->pktin
.type
),
898 ssh
->pktin
.body
, ssh
->pktin
.length
);
900 if (ssh
->pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
901 ssh
->pktin
.type
== SSH1_SMSG_STDERR_DATA
||
902 ssh
->pktin
.type
== SSH1_MSG_DEBUG
||
903 ssh
->pktin
.type
== SSH1_SMSG_AUTH_TIS_CHALLENGE
||
904 ssh
->pktin
.type
== SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
905 long stringlen
= GET_32BIT(ssh
->pktin
.body
);
906 if (stringlen
+ 4 != ssh
->pktin
.length
) {
907 bombout(("Received data packet with bogus string length"));
912 if (ssh
->pktin
.type
== SSH1_MSG_DEBUG
) {
913 /* log debug message */
915 int stringlen
= GET_32BIT(ssh
->pktin
.body
);
916 strcpy(buf
, "Remote debug message: ");
919 memcpy(buf
+ 8, ssh
->pktin
.body
+ 4, stringlen
);
920 buf
[8 + stringlen
] = '\0';
923 } else if (ssh
->pktin
.type
== SSH1_MSG_IGNORE
) {
928 if (ssh
->pktin
.type
== SSH1_MSG_DISCONNECT
) {
929 /* log reason code in disconnect message */
931 unsigned msglen
= GET_32BIT(ssh
->pktin
.body
);
933 strcpy(buf
, "Remote sent disconnect: ");
934 nowlen
= strlen(buf
);
935 if (msglen
> sizeof(buf
) - nowlen
- 1)
936 msglen
= sizeof(buf
) - nowlen
- 1;
937 memcpy(buf
+ nowlen
, ssh
->pktin
.body
+ 4, msglen
);
938 buf
[nowlen
+ msglen
] = '\0';
939 /* logevent(buf); (this is now done within the bombout macro) */
940 bombout(("Server sent disconnect message:\n\"%s\"", buf
+nowlen
));
947 static int ssh2_rdpkt(Ssh ssh
, unsigned char **data
, int *datalen
)
949 struct rdpkt2_state_tag
*st
= &ssh
->rdpkt2_state
;
951 crBegin(ssh
->ssh2_rdpkt_crstate
);
955 ssh
->pktin
.length
= 0;
957 st
->cipherblk
= ssh
->sccipher
->blksize
;
960 if (st
->cipherblk
< 8)
963 if (ssh
->pktin
.maxlen
< st
->cipherblk
) {
964 ssh
->pktin
.maxlen
= st
->cipherblk
;
965 ssh
->pktin
.data
= sresize(ssh
->pktin
.data
, st
->cipherblk
+ APIEXTRA
,
970 * Acquire and decrypt the first block of the packet. This will
971 * contain the length and padding details.
973 for (st
->i
= st
->len
= 0; st
->i
< st
->cipherblk
; st
->i
++) {
974 while ((*datalen
) == 0)
975 crReturn(st
->cipherblk
- st
->i
);
976 ssh
->pktin
.data
[st
->i
] = *(*data
)++;
981 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
982 ssh
->pktin
.data
, st
->cipherblk
);
985 * Now get the length and padding figures.
987 st
->len
= GET_32BIT(ssh
->pktin
.data
);
988 st
->pad
= ssh
->pktin
.data
[4];
991 * _Completely_ silly lengths should be stomped on before they
992 * do us any more damage.
994 if (st
->len
< 0 || st
->pad
< 0 || st
->len
+ st
->pad
< 0) {
995 bombout(("Incoming packet was garbled on decryption"));
1000 * This enables us to deduce the payload length.
1002 st
->payload
= st
->len
- st
->pad
- 1;
1004 ssh
->pktin
.length
= st
->payload
+ 5;
1007 * So now we can work out the total packet length.
1009 st
->packetlen
= st
->len
+ 4;
1010 st
->maclen
= ssh
->scmac ? ssh
->scmac
->len
: 0;
1013 * Adjust memory allocation if packet is too big.
1015 if (ssh
->pktin
.maxlen
< st
->packetlen
+ st
->maclen
) {
1016 ssh
->pktin
.maxlen
= st
->packetlen
+ st
->maclen
;
1017 ssh
->pktin
.data
= sresize(ssh
->pktin
.data
,
1018 ssh
->pktin
.maxlen
+ APIEXTRA
,
1023 * Read and decrypt the remainder of the packet.
1025 for (st
->i
= st
->cipherblk
; st
->i
< st
->packetlen
+ st
->maclen
;
1027 while ((*datalen
) == 0)
1028 crReturn(st
->packetlen
+ st
->maclen
- st
->i
);
1029 ssh
->pktin
.data
[st
->i
] = *(*data
)++;
1032 /* Decrypt everything _except_ the MAC. */
1034 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
1035 ssh
->pktin
.data
+ st
->cipherblk
,
1036 st
->packetlen
- st
->cipherblk
);
1042 && !ssh
->scmac
->verify(ssh
->sc_mac_ctx
, ssh
->pktin
.data
, st
->len
+ 4,
1043 st
->incoming_sequence
)) {
1044 bombout(("Incorrect MAC received on packet"));
1047 st
->incoming_sequence
++; /* whether or not we MACed */
1050 * Decompress packet payload.
1053 unsigned char *newpayload
;
1056 ssh
->sccomp
->decompress(ssh
->sc_comp_ctx
,
1057 ssh
->pktin
.data
+ 5, ssh
->pktin
.length
- 5,
1058 &newpayload
, &newlen
)) {
1059 if (ssh
->pktin
.maxlen
< newlen
+ 5) {
1060 ssh
->pktin
.maxlen
= newlen
+ 5;
1061 ssh
->pktin
.data
= sresize(ssh
->pktin
.data
,
1062 ssh
->pktin
.maxlen
+ APIEXTRA
,
1065 ssh
->pktin
.length
= 5 + newlen
;
1066 memcpy(ssh
->pktin
.data
+ 5, newpayload
, newlen
);
1071 ssh
->pktin
.savedpos
= 6;
1072 ssh
->pktin
.type
= ssh
->pktin
.data
[5];
1075 log_packet(ssh
->logctx
, PKT_INCOMING
, ssh
->pktin
.type
,
1076 ssh2_pkt_type(ssh
->pkt_ctx
, ssh
->pktin
.type
),
1077 ssh
->pktin
.data
+6, ssh
->pktin
.length
-6);
1079 switch (ssh
->pktin
.type
) {
1081 * These packets we must handle instantly.
1083 case SSH2_MSG_DISCONNECT
:
1085 /* log reason code in disconnect message */
1088 int reason
= GET_32BIT(ssh
->pktin
.data
+ 6);
1089 unsigned msglen
= GET_32BIT(ssh
->pktin
.data
+ 10);
1091 if (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) {
1092 buf
= dupprintf("Received disconnect message (%s)",
1093 ssh2_disconnect_reasons
[reason
]);
1095 buf
= dupprintf("Received disconnect message (unknown"
1096 " type %d)", reason
);
1100 buf
= dupprintf("Disconnection message text: %n%.*s",
1101 &nowlen
, msglen
, ssh
->pktin
.data
+ 14);
1103 bombout(("Server sent disconnect message\ntype %d (%s):\n\"%s\"",
1105 (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) ?
1106 ssh2_disconnect_reasons
[reason
] : "unknown",
1112 case SSH2_MSG_IGNORE
:
1114 case SSH2_MSG_DEBUG
:
1116 /* log the debug message */
1118 /* int display = ssh->pktin.body[6]; */
1119 int stringlen
= GET_32BIT(ssh
->pktin
.data
+7);
1121 strcpy(buf
, "Remote debug message: ");
1122 prefix
= strlen(buf
);
1123 if (stringlen
> (int)(sizeof(buf
)-prefix
-1))
1124 stringlen
= sizeof(buf
)-prefix
-1;
1125 memcpy(buf
+ prefix
, ssh
->pktin
.data
+ 11, stringlen
);
1126 buf
[prefix
+ stringlen
] = '\0';
1129 goto next_packet
; /* FIXME: print the debug message */
1132 * These packets we need do nothing about here.
1134 case SSH2_MSG_UNIMPLEMENTED
:
1135 case SSH2_MSG_SERVICE_REQUEST
:
1136 case SSH2_MSG_SERVICE_ACCEPT
:
1137 case SSH2_MSG_KEXINIT
:
1138 case SSH2_MSG_NEWKEYS
:
1139 case SSH2_MSG_KEXDH_INIT
:
1140 case SSH2_MSG_KEXDH_REPLY
:
1141 /* case SSH2_MSG_KEX_DH_GEX_REQUEST: duplicate case value */
1142 /* case SSH2_MSG_KEX_DH_GEX_GROUP: duplicate case value */
1143 case SSH2_MSG_KEX_DH_GEX_INIT
:
1144 case SSH2_MSG_KEX_DH_GEX_REPLY
:
1145 case SSH2_MSG_USERAUTH_REQUEST
:
1146 case SSH2_MSG_USERAUTH_FAILURE
:
1147 case SSH2_MSG_USERAUTH_SUCCESS
:
1148 case SSH2_MSG_USERAUTH_BANNER
:
1149 case SSH2_MSG_USERAUTH_PK_OK
:
1150 /* case SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ: duplicate case value */
1151 /* case SSH2_MSG_USERAUTH_INFO_REQUEST: duplicate case value */
1152 case SSH2_MSG_USERAUTH_INFO_RESPONSE
:
1153 case SSH2_MSG_GLOBAL_REQUEST
:
1154 case SSH2_MSG_REQUEST_SUCCESS
:
1155 case SSH2_MSG_REQUEST_FAILURE
:
1156 case SSH2_MSG_CHANNEL_OPEN
:
1157 case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
:
1158 case SSH2_MSG_CHANNEL_OPEN_FAILURE
:
1159 case SSH2_MSG_CHANNEL_WINDOW_ADJUST
:
1160 case SSH2_MSG_CHANNEL_DATA
:
1161 case SSH2_MSG_CHANNEL_EXTENDED_DATA
:
1162 case SSH2_MSG_CHANNEL_EOF
:
1163 case SSH2_MSG_CHANNEL_CLOSE
:
1164 case SSH2_MSG_CHANNEL_REQUEST
:
1165 case SSH2_MSG_CHANNEL_SUCCESS
:
1166 case SSH2_MSG_CHANNEL_FAILURE
:
1170 * For anything else we send SSH2_MSG_UNIMPLEMENTED.
1173 ssh2_pkt_init(ssh
, SSH2_MSG_UNIMPLEMENTED
);
1174 ssh2_pkt_adduint32(ssh
, st
->incoming_sequence
- 1);
1182 static void ssh1_pktout_size(Ssh ssh
, int len
)
1186 len
+= 5; /* type and CRC */
1187 pad
= 8 - (len
% 8);
1190 ssh
->pktout
.length
= len
- 5;
1191 if (ssh
->pktout
.maxlen
< biglen
) {
1192 ssh
->pktout
.maxlen
= biglen
;
1194 /* Allocate enough buffer space for extra block
1195 * for MS CryptEncrypt() */
1196 ssh
->pktout
.data
= sresize(ssh
->pktout
.data
, biglen
+ 12,
1199 ssh
->pktout
.data
= sresize(ssh
->pktout
.data
, biglen
+ 4,
1203 ssh
->pktout
.body
= ssh
->pktout
.data
+ 4 + pad
+ 1;
1206 static void s_wrpkt_start(Ssh ssh
, int type
, int len
)
1208 ssh1_pktout_size(ssh
, len
);
1209 ssh
->pktout
.type
= type
;
1212 static int s_wrpkt_prepare(Ssh ssh
)
1218 * XXX various versions of SC (including 8.8.4) screw up the
1219 * register allocation in this function and use the same register
1220 * (D6) for len and as a temporary, with predictable results. The
1221 * following sledgehammer prevents this.
1227 ssh
->pktout
.body
[-1] = ssh
->pktout
.type
;
1230 log_packet(ssh
->logctx
, PKT_OUTGOING
, ssh
->pktout
.type
,
1231 ssh1_pkt_type(ssh
->pktout
.type
),
1232 ssh
->pktout
.body
, ssh
->pktout
.length
);
1234 if (ssh
->v1_compressing
) {
1235 unsigned char *compblk
;
1237 zlib_compress_block(ssh
->cs_comp_ctx
,
1238 ssh
->pktout
.body
- 1, ssh
->pktout
.length
+ 1,
1239 &compblk
, &complen
);
1240 ssh1_pktout_size(ssh
, complen
- 1);
1241 memcpy(ssh
->pktout
.body
- 1, compblk
, complen
);
1245 len
= ssh
->pktout
.length
+ 5; /* type and CRC */
1246 pad
= 8 - (len
% 8);
1249 for (i
= 0; i
< pad
; i
++)
1250 ssh
->pktout
.data
[i
+ 4] = random_byte();
1251 crc
= crc32_compute(ssh
->pktout
.data
+ 4, biglen
- 4);
1252 PUT_32BIT(ssh
->pktout
.data
+ biglen
, crc
);
1253 PUT_32BIT(ssh
->pktout
.data
, len
);
1256 ssh
->cipher
->encrypt(ssh
->v1_cipher_ctx
, ssh
->pktout
.data
+ 4, biglen
);
1261 static void s_wrpkt(Ssh ssh
)
1264 len
= s_wrpkt_prepare(ssh
);
1265 backlog
= sk_write(ssh
->s
, (char *)ssh
->pktout
.data
, len
);
1266 if (backlog
> SSH_MAX_BACKLOG
)
1267 ssh_throttle_all(ssh
, 1, backlog
);
1270 static void s_wrpkt_defer(Ssh ssh
)
1273 len
= s_wrpkt_prepare(ssh
);
1274 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1275 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1276 ssh
->deferred_send_data
= sresize(ssh
->deferred_send_data
,
1280 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, ssh
->pktout
.data
, len
);
1281 ssh
->deferred_len
+= len
;
1285 * Construct a packet with the specified contents.
1287 static void construct_packet(Ssh ssh
, int pkttype
, va_list ap1
, va_list ap2
)
1289 unsigned char *p
, *argp
, argchar
;
1290 unsigned long argint
;
1291 int pktlen
, argtype
, arglen
;
1295 while ((argtype
= va_arg(ap1
, int)) != PKT_END
) {
1298 (void) va_arg(ap1
, int);
1302 (void) va_arg(ap1
, int);
1306 (void) va_arg(ap1
, unsigned char *);
1307 arglen
= va_arg(ap1
, int);
1311 argp
= va_arg(ap1
, unsigned char *);
1312 arglen
= strlen((char *)argp
);
1313 pktlen
+= 4 + arglen
;
1316 bn
= va_arg(ap1
, Bignum
);
1317 pktlen
+= ssh1_bignum_length(bn
);
1324 s_wrpkt_start(ssh
, pkttype
, pktlen
);
1325 p
= ssh
->pktout
.body
;
1327 while ((argtype
= va_arg(ap2
, int)) != PKT_END
) {
1330 argint
= va_arg(ap2
, int);
1331 PUT_32BIT(p
, argint
);
1335 argchar
= (unsigned char) va_arg(ap2
, int);
1340 argp
= va_arg(ap2
, unsigned char *);
1341 arglen
= va_arg(ap2
, int);
1342 memcpy(p
, argp
, arglen
);
1346 argp
= va_arg(ap2
, unsigned char *);
1347 arglen
= strlen((char *)argp
);
1348 PUT_32BIT(p
, arglen
);
1349 memcpy(p
+ 4, argp
, arglen
);
1353 bn
= va_arg(ap2
, Bignum
);
1354 p
+= ssh1_write_bignum(p
, bn
);
1360 static void send_packet(Ssh ssh
, int pkttype
, ...)
1363 va_start(ap1
, pkttype
);
1364 va_start(ap2
, pkttype
);
1365 construct_packet(ssh
, pkttype
, ap1
, ap2
);
1369 static void defer_packet(Ssh ssh
, int pkttype
, ...)
1372 va_start(ap1
, pkttype
);
1373 va_start(ap2
, pkttype
);
1374 construct_packet(ssh
, pkttype
, ap1
, ap2
);
1378 static int ssh_versioncmp(char *a
, char *b
)
1381 unsigned long av
, bv
;
1383 av
= strtoul(a
, &ae
, 10);
1384 bv
= strtoul(b
, &be
, 10);
1386 return (av
< bv ?
-1 : +1);
1391 av
= strtoul(ae
, &ae
, 10);
1392 bv
= strtoul(be
, &be
, 10);
1394 return (av
< bv ?
-1 : +1);
1399 * Utility routines for putting an SSH-protocol `string' and
1400 * `uint32' into a SHA state.
1403 static void sha_string(SHA_State
* s
, void *str
, int len
)
1405 unsigned char lenblk
[4];
1406 PUT_32BIT(lenblk
, len
);
1407 SHA_Bytes(s
, lenblk
, 4);
1408 SHA_Bytes(s
, str
, len
);
1411 static void sha_uint32(SHA_State
* s
, unsigned i
)
1413 unsigned char intblk
[4];
1414 PUT_32BIT(intblk
, i
);
1415 SHA_Bytes(s
, intblk
, 4);
1419 * SSH2 packet construction functions.
1421 static void ssh2_pkt_ensure(Ssh ssh
, int length
)
1423 if (ssh
->pktout
.maxlen
< length
) {
1424 ssh
->pktout
.maxlen
= length
+ 256;
1425 ssh
->pktout
.data
= sresize(ssh
->pktout
.data
,
1426 ssh
->pktout
.maxlen
+ APIEXTRA
,
1428 if (!ssh
->pktout
.data
)
1429 fatalbox("Out of memory");
1432 static void ssh2_pkt_adddata(Ssh ssh
, void *data
, int len
)
1434 ssh
->pktout
.length
+= len
;
1435 ssh2_pkt_ensure(ssh
, ssh
->pktout
.length
);
1436 memcpy(ssh
->pktout
.data
+ ssh
->pktout
.length
- len
, data
, len
);
1438 static void ssh2_pkt_addbyte(Ssh ssh
, unsigned char byte
)
1440 ssh2_pkt_adddata(ssh
, &byte
, 1);
1442 static void ssh2_pkt_init(Ssh ssh
, int pkt_type
)
1444 ssh
->pktout
.length
= 5;
1445 ssh2_pkt_addbyte(ssh
, (unsigned char) pkt_type
);
1447 static void ssh2_pkt_addbool(Ssh ssh
, unsigned char value
)
1449 ssh2_pkt_adddata(ssh
, &value
, 1);
1451 static void ssh2_pkt_adduint32(Ssh ssh
, unsigned long value
)
1454 PUT_32BIT(x
, value
);
1455 ssh2_pkt_adddata(ssh
, x
, 4);
1457 static void ssh2_pkt_addstring_start(Ssh ssh
)
1459 ssh2_pkt_adduint32(ssh
, 0);
1460 ssh
->pktout
.savedpos
= ssh
->pktout
.length
;
1462 static void ssh2_pkt_addstring_str(Ssh ssh
, char *data
)
1464 ssh2_pkt_adddata(ssh
, data
, strlen(data
));
1465 PUT_32BIT(ssh
->pktout
.data
+ ssh
->pktout
.savedpos
- 4,
1466 ssh
->pktout
.length
- ssh
->pktout
.savedpos
);
1468 static void ssh2_pkt_addstring_data(Ssh ssh
, char *data
, int len
)
1470 ssh2_pkt_adddata(ssh
, data
, len
);
1471 PUT_32BIT(ssh
->pktout
.data
+ ssh
->pktout
.savedpos
- 4,
1472 ssh
->pktout
.length
- ssh
->pktout
.savedpos
);
1474 static void ssh2_pkt_addstring(Ssh ssh
, char *data
)
1476 ssh2_pkt_addstring_start(ssh
);
1477 ssh2_pkt_addstring_str(ssh
, data
);
1479 static unsigned char *ssh2_mpint_fmt(Bignum b
, int *len
)
1482 int i
, n
= (bignum_bitcount(b
) + 7) / 8;
1483 p
= snewn(n
+ 1, unsigned char);
1485 fatalbox("out of memory");
1487 for (i
= 1; i
<= n
; i
++)
1488 p
[i
] = bignum_byte(b
, n
- i
);
1490 while (i
<= n
&& p
[i
] == 0 && (p
[i
+ 1] & 0x80) == 0)
1492 memmove(p
, p
+ i
, n
+ 1 - i
);
1496 static void ssh2_pkt_addmp(Ssh ssh
, Bignum b
)
1500 p
= ssh2_mpint_fmt(b
, &len
);
1501 ssh2_pkt_addstring_start(ssh
);
1502 ssh2_pkt_addstring_data(ssh
, (char *)p
, len
);
1507 * Construct an SSH2 final-form packet: compress it, encrypt it,
1508 * put the MAC on it. Final packet, ready to be sent, is stored in
1509 * ssh->pktout.data. Total length is returned.
1511 static int ssh2_pkt_construct(Ssh ssh
)
1513 int cipherblk
, maclen
, padding
, i
;
1516 log_packet(ssh
->logctx
, PKT_OUTGOING
, ssh
->pktout
.data
[5],
1517 ssh2_pkt_type(ssh
->pkt_ctx
, ssh
->pktout
.data
[5]),
1518 ssh
->pktout
.data
+ 6, ssh
->pktout
.length
- 6);
1521 * Compress packet payload.
1524 unsigned char *newpayload
;
1527 ssh
->cscomp
->compress(ssh
->cs_comp_ctx
, ssh
->pktout
.data
+ 5,
1528 ssh
->pktout
.length
- 5,
1529 &newpayload
, &newlen
)) {
1530 ssh
->pktout
.length
= 5;
1531 ssh2_pkt_adddata(ssh
, newpayload
, newlen
);
1537 * Add padding. At least four bytes, and must also bring total
1538 * length (minus MAC) up to a multiple of the block size.
1540 cipherblk
= ssh
->cscipher ? ssh
->cscipher
->blksize
: 8; /* block size */
1541 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
1544 (cipherblk
- (ssh
->pktout
.length
+ padding
) % cipherblk
) % cipherblk
;
1545 maclen
= ssh
->csmac ? ssh
->csmac
->len
: 0;
1546 ssh2_pkt_ensure(ssh
, ssh
->pktout
.length
+ padding
+ maclen
);
1547 ssh
->pktout
.data
[4] = padding
;
1548 for (i
= 0; i
< padding
; i
++)
1549 ssh
->pktout
.data
[ssh
->pktout
.length
+ i
] = random_byte();
1550 PUT_32BIT(ssh
->pktout
.data
, ssh
->pktout
.length
+ padding
- 4);
1552 ssh
->csmac
->generate(ssh
->cs_mac_ctx
, ssh
->pktout
.data
,
1553 ssh
->pktout
.length
+ padding
,
1554 ssh
->v2_outgoing_sequence
);
1555 ssh
->v2_outgoing_sequence
++; /* whether or not we MACed */
1558 ssh
->cscipher
->encrypt(ssh
->cs_cipher_ctx
,
1559 ssh
->pktout
.data
, ssh
->pktout
.length
+ padding
);
1561 /* Ready-to-send packet starts at ssh->pktout.data. We return length. */
1562 return ssh
->pktout
.length
+ padding
+ maclen
;
1566 * Construct and send an SSH2 packet immediately.
1568 static void ssh2_pkt_send(Ssh ssh
)
1572 len
= ssh2_pkt_construct(ssh
);
1573 backlog
= sk_write(ssh
->s
, (char *)ssh
->pktout
.data
, len
);
1574 if (backlog
> SSH_MAX_BACKLOG
)
1575 ssh_throttle_all(ssh
, 1, backlog
);
1579 * Construct an SSH2 packet and add it to a deferred data block.
1580 * Useful for sending multiple packets in a single sk_write() call,
1581 * to prevent a traffic-analysing listener from being able to work
1582 * out the length of any particular packet (such as the password
1585 * Note that because SSH2 sequence-numbers its packets, this can
1586 * NOT be used as an m4-style `defer' allowing packets to be
1587 * constructed in one order and sent in another.
1589 static void ssh2_pkt_defer(Ssh ssh
)
1591 int len
= ssh2_pkt_construct(ssh
);
1592 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1593 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1594 ssh
->deferred_send_data
= sresize(ssh
->deferred_send_data
,
1598 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, ssh
->pktout
.data
, len
);
1599 ssh
->deferred_len
+= len
;
1603 * Send the whole deferred data block constructed by
1604 * ssh2_pkt_defer() or SSH1's defer_packet().
1606 static void ssh_pkt_defersend(Ssh ssh
)
1609 backlog
= sk_write(ssh
->s
, (char *)ssh
->deferred_send_data
,
1611 ssh
->deferred_len
= ssh
->deferred_size
= 0;
1612 sfree(ssh
->deferred_send_data
);
1613 ssh
->deferred_send_data
= NULL
;
1614 if (backlog
> SSH_MAX_BACKLOG
)
1615 ssh_throttle_all(ssh
, 1, backlog
);
1619 void bndebug(char *string
, Bignum b
)
1623 p
= ssh2_mpint_fmt(b
, &len
);
1624 debug(("%s", string
));
1625 for (i
= 0; i
< len
; i
++)
1626 debug((" %02x", p
[i
]));
1632 static void sha_mpint(SHA_State
* s
, Bignum b
)
1636 p
= ssh2_mpint_fmt(b
, &len
);
1637 sha_string(s
, p
, len
);
1642 * SSH2 packet decode functions.
1644 static unsigned long ssh2_pkt_getuint32(Ssh ssh
)
1646 unsigned long value
;
1647 if (ssh
->pktin
.length
- ssh
->pktin
.savedpos
< 4)
1648 return 0; /* arrgh, no way to decline (FIXME?) */
1649 value
= GET_32BIT(ssh
->pktin
.data
+ ssh
->pktin
.savedpos
);
1650 ssh
->pktin
.savedpos
+= 4;
1653 static int ssh2_pkt_getbool(Ssh ssh
)
1655 unsigned long value
;
1656 if (ssh
->pktin
.length
- ssh
->pktin
.savedpos
< 1)
1657 return 0; /* arrgh, no way to decline (FIXME?) */
1658 value
= ssh
->pktin
.data
[ssh
->pktin
.savedpos
] != 0;
1659 ssh
->pktin
.savedpos
++;
1662 static void ssh2_pkt_getstring(Ssh ssh
, char **p
, int *length
)
1667 if (ssh
->pktin
.length
- ssh
->pktin
.savedpos
< 4)
1669 len
= GET_32BIT(ssh
->pktin
.data
+ ssh
->pktin
.savedpos
);
1673 ssh
->pktin
.savedpos
+= 4;
1674 if (ssh
->pktin
.length
- ssh
->pktin
.savedpos
< *length
)
1676 *p
= (char *)(ssh
->pktin
.data
+ ssh
->pktin
.savedpos
);
1677 ssh
->pktin
.savedpos
+= *length
;
1679 static Bignum
ssh2_pkt_getmp(Ssh ssh
)
1685 ssh2_pkt_getstring(ssh
, &p
, &length
);
1689 bombout(("internal error: Can't handle negative mpints"));
1692 b
= bignum_from_bytes((unsigned char *)p
, length
);
1697 * Helper function to add an SSH2 signature blob to a packet.
1698 * Expects to be shown the public key blob as well as the signature
1699 * blob. Normally works just like ssh2_pkt_addstring, but will
1700 * fiddle with the signature packet if necessary for
1701 * BUG_SSH2_RSA_PADDING.
1703 static void ssh2_add_sigblob(Ssh ssh
, void *pkblob_v
, int pkblob_len
,
1704 void *sigblob_v
, int sigblob_len
)
1706 unsigned char *pkblob
= (unsigned char *)pkblob_v
;
1707 unsigned char *sigblob
= (unsigned char *)sigblob_v
;
1709 /* dmemdump(pkblob, pkblob_len); */
1710 /* dmemdump(sigblob, sigblob_len); */
1713 * See if this is in fact an ssh-rsa signature and a buggy
1714 * server; otherwise we can just do this the easy way.
1716 if ((ssh
->remote_bugs
& BUG_SSH2_RSA_PADDING
) &&
1717 (GET_32BIT(pkblob
) == 7 && !memcmp(pkblob
+4, "ssh-rsa", 7))) {
1718 int pos
, len
, siglen
;
1721 * Find the byte length of the modulus.
1724 pos
= 4+7; /* skip over "ssh-rsa" */
1725 pos
+= 4 + GET_32BIT(pkblob
+pos
); /* skip over exponent */
1726 len
= GET_32BIT(pkblob
+pos
); /* find length of modulus */
1727 pos
+= 4; /* find modulus itself */
1728 while (len
> 0 && pkblob
[pos
] == 0)
1730 /* debug(("modulus length is %d\n", len)); */
1733 * Now find the signature integer.
1735 pos
= 4+7; /* skip over "ssh-rsa" */
1736 siglen
= GET_32BIT(sigblob
+pos
);
1737 /* debug(("signature length is %d\n", siglen)); */
1739 if (len
!= siglen
) {
1740 unsigned char newlen
[4];
1741 ssh2_pkt_addstring_start(ssh
);
1742 ssh2_pkt_addstring_data(ssh
, (char *)sigblob
, pos
);
1743 /* dmemdump(sigblob, pos); */
1744 pos
+= 4; /* point to start of actual sig */
1745 PUT_32BIT(newlen
, len
);
1746 ssh2_pkt_addstring_data(ssh
, (char *)newlen
, 4);
1747 /* dmemdump(newlen, 4); */
1749 while (len
-- > siglen
) {
1750 ssh2_pkt_addstring_data(ssh
, (char *)newlen
, 1);
1751 /* dmemdump(newlen, 1); */
1753 ssh2_pkt_addstring_data(ssh
, (char *)(sigblob
+pos
), siglen
);
1754 /* dmemdump(sigblob+pos, siglen); */
1758 /* Otherwise fall through and do it the easy way. */
1761 ssh2_pkt_addstring_start(ssh
);
1762 ssh2_pkt_addstring_data(ssh
, (char *)sigblob
, sigblob_len
);
1766 * Examine the remote side's version string and compare it against
1767 * a list of known buggy implementations.
1769 static void ssh_detect_bugs(Ssh ssh
, char *vstring
)
1771 char *imp
; /* pointer to implementation part */
1773 imp
+= strcspn(imp
, "-");
1775 imp
+= strcspn(imp
, "-");
1778 ssh
->remote_bugs
= 0;
1780 if (ssh
->cfg
.sshbug_ignore1
== FORCE_ON
||
1781 (ssh
->cfg
.sshbug_ignore1
== AUTO
&&
1782 (!strcmp(imp
, "1.2.18") || !strcmp(imp
, "1.2.19") ||
1783 !strcmp(imp
, "1.2.20") || !strcmp(imp
, "1.2.21") ||
1784 !strcmp(imp
, "1.2.22") || !strcmp(imp
, "Cisco-1.25") ||
1785 !strcmp(imp
, "OSU_1.4alpha3")))) {
1787 * These versions don't support SSH1_MSG_IGNORE, so we have
1788 * to use a different defence against password length
1791 ssh
->remote_bugs
|= BUG_CHOKES_ON_SSH1_IGNORE
;
1792 logevent("We believe remote version has SSH1 ignore bug");
1795 if (ssh
->cfg
.sshbug_plainpw1
== FORCE_ON
||
1796 (ssh
->cfg
.sshbug_plainpw1
== AUTO
&&
1797 (!strcmp(imp
, "Cisco-1.25") || !strcmp(imp
, "OSU_1.4alpha3")))) {
1799 * These versions need a plain password sent; they can't
1800 * handle having a null and a random length of data after
1803 ssh
->remote_bugs
|= BUG_NEEDS_SSH1_PLAIN_PASSWORD
;
1804 logevent("We believe remote version needs a plain SSH1 password");
1807 if (ssh
->cfg
.sshbug_rsa1
== FORCE_ON
||
1808 (ssh
->cfg
.sshbug_rsa1
== AUTO
&&
1809 (!strcmp(imp
, "Cisco-1.25")))) {
1811 * These versions apparently have no clue whatever about
1812 * RSA authentication and will panic and die if they see
1813 * an AUTH_RSA message.
1815 ssh
->remote_bugs
|= BUG_CHOKES_ON_RSA
;
1816 logevent("We believe remote version can't handle RSA authentication");
1819 if (ssh
->cfg
.sshbug_hmac2
== FORCE_ON
||
1820 (ssh
->cfg
.sshbug_hmac2
== AUTO
&&
1821 !wc_match("* VShell", imp
) &&
1822 (wc_match("2.1.0*", imp
) || wc_match("2.0.*", imp
) ||
1823 wc_match("2.2.0*", imp
) || wc_match("2.3.0*", imp
) ||
1824 wc_match("2.1 *", imp
)))) {
1826 * These versions have the HMAC bug.
1828 ssh
->remote_bugs
|= BUG_SSH2_HMAC
;
1829 logevent("We believe remote version has SSH2 HMAC bug");
1832 if (ssh
->cfg
.sshbug_derivekey2
== FORCE_ON
||
1833 (ssh
->cfg
.sshbug_derivekey2
== AUTO
&&
1834 !wc_match("* VShell", imp
) &&
1835 (wc_match("2.0.0*", imp
) || wc_match("2.0.10*", imp
) ))) {
1837 * These versions have the key-derivation bug (failing to
1838 * include the literal shared secret in the hashes that
1839 * generate the keys).
1841 ssh
->remote_bugs
|= BUG_SSH2_DERIVEKEY
;
1842 logevent("We believe remote version has SSH2 key-derivation bug");
1845 if (ssh
->cfg
.sshbug_rsapad2
== FORCE_ON
||
1846 (ssh
->cfg
.sshbug_rsapad2
== AUTO
&&
1847 (wc_match("OpenSSH_2.[5-9]*", imp
) ||
1848 wc_match("OpenSSH_3.[0-2]*", imp
)))) {
1850 * These versions have the SSH2 RSA padding bug.
1852 ssh
->remote_bugs
|= BUG_SSH2_RSA_PADDING
;
1853 logevent("We believe remote version has SSH2 RSA padding bug");
1856 if (ssh
->cfg
.sshbug_pksessid2
== FORCE_ON
||
1857 (ssh
->cfg
.sshbug_pksessid2
== AUTO
&&
1858 wc_match("OpenSSH_2.[0-2]*", imp
))) {
1860 * These versions have the SSH2 session-ID bug in
1861 * public-key authentication.
1863 ssh
->remote_bugs
|= BUG_SSH2_PK_SESSIONID
;
1864 logevent("We believe remote version has SSH2 public-key-session-ID bug");
1867 if (ssh
->cfg
.sshbug_dhgex2
== FORCE_ON
) {
1869 * User specified the SSH2 DH GEX bug.
1871 ssh
->remote_bugs
|= BUG_SSH2_DH_GEX
;
1872 logevent("We believe remote version has SSH2 DH group exchange bug");
1876 static int do_ssh_init(Ssh ssh
, unsigned char c
)
1878 struct do_ssh_init_state
{
1886 crState(do_ssh_init_state
);
1888 crBegin(ssh
->do_ssh_init_crstate
);
1890 /* Search for the string "SSH-" in the input. */
1893 static const int transS
[] = { 1, 2, 2, 1 };
1894 static const int transH
[] = { 0, 0, 3, 0 };
1895 static const int transminus
[] = { 0, 0, 0, -1 };
1897 s
->i
= transS
[s
->i
];
1899 s
->i
= transH
[s
->i
];
1901 s
->i
= transminus
[s
->i
];
1906 crReturn(1); /* get another character */
1910 s
->vstring
= snewn(s
->vstrsize
, char);
1911 strcpy(s
->vstring
, "SSH-");
1915 crReturn(1); /* get another char */
1916 if (s
->vslen
>= s
->vstrsize
- 1) {
1918 s
->vstring
= sresize(s
->vstring
, s
->vstrsize
, char);
1920 s
->vstring
[s
->vslen
++] = c
;
1923 s
->version
[s
->i
] = '\0';
1925 } else if (s
->i
< sizeof(s
->version
) - 1)
1926 s
->version
[s
->i
++] = c
;
1927 } else if (c
== '\012')
1931 ssh
->agentfwd_enabled
= FALSE
;
1932 ssh
->rdpkt2_state
.incoming_sequence
= 0;
1934 s
->vstring
[s
->vslen
] = 0;
1935 s
->vstring
[strcspn(s
->vstring
, "\r\n")] = '\0';/* remove EOL chars */
1938 vlog
= snewn(20 + s
->vslen
, char);
1939 sprintf(vlog
, "Server version: %s", s
->vstring
);
1943 ssh_detect_bugs(ssh
, s
->vstring
);
1946 * Decide which SSH protocol version to support.
1949 /* Anything strictly below "2.0" means protocol 1 is supported. */
1950 s
->proto1
= ssh_versioncmp(s
->version
, "2.0") < 0;
1951 /* Anything greater or equal to "1.99" means protocol 2 is supported. */
1952 s
->proto2
= ssh_versioncmp(s
->version
, "1.99") >= 0;
1954 if (ssh
->cfg
.sshprot
== 0 && !s
->proto1
) {
1955 bombout(("SSH protocol version 1 required by user but not provided by server"));
1958 if (ssh
->cfg
.sshprot
== 3 && !s
->proto2
) {
1959 bombout(("SSH protocol version 2 required by user but not provided by server"));
1963 if (s
->proto2
&& (ssh
->cfg
.sshprot
>= 2 || !s
->proto1
)) {
1967 char verstring
[80], vlog
[100];
1968 sprintf(verstring
, "SSH-2.0-%s", sshver
);
1969 SHA_Init(&ssh
->exhashbase
);
1971 * Hash our version string and their version string.
1973 sha_string(&ssh
->exhashbase
, verstring
, strlen(verstring
));
1974 sha_string(&ssh
->exhashbase
, s
->vstring
, strcspn(s
->vstring
, "\r\n"));
1975 sprintf(vlog
, "We claim version: %s", verstring
);
1977 strcat(verstring
, "\012");
1978 logevent("Using SSH protocol version 2");
1979 sk_write(ssh
->s
, verstring
, strlen(verstring
));
1980 ssh
->protocol
= ssh2_protocol
;
1982 ssh
->s_rdpkt
= ssh2_rdpkt
;
1987 char verstring
[80], vlog
[100];
1988 sprintf(verstring
, "SSH-%s-%s",
1989 (ssh_versioncmp(s
->version
, "1.5") <= 0 ? s
->version
: "1.5"),
1991 sprintf(vlog
, "We claim version: %s", verstring
);
1993 strcat(verstring
, "\012");
1995 logevent("Using SSH protocol version 1");
1996 sk_write(ssh
->s
, verstring
, strlen(verstring
));
1997 ssh
->protocol
= ssh1_protocol
;
1999 ssh
->s_rdpkt
= ssh1_rdpkt
;
2001 update_specials_menu(ssh
->frontend
);
2002 ssh
->state
= SSH_STATE_BEFORE_SIZE
;
2009 static void ssh_gotdata(Ssh ssh
, unsigned char *data
, int datalen
)
2011 crBegin(ssh
->ssh_gotdata_crstate
);
2014 * To begin with, feed the characters one by one to the
2015 * protocol initialisation / selection function do_ssh_init().
2016 * When that returns 0, we're done with the initial greeting
2017 * exchange and can move on to packet discipline.
2020 int ret
; /* need not be kept across crReturn */
2022 crReturnV
; /* more data please */
2023 ret
= do_ssh_init(ssh
, *data
);
2031 * We emerge from that loop when the initial negotiation is
2032 * over and we have selected an s_rdpkt function. Now pass
2033 * everything to s_rdpkt, and then pass the resulting packets
2034 * to the proper protocol handler.
2039 while (datalen
> 0) {
2040 if (ssh
->s_rdpkt(ssh
, &data
, &datalen
) == 0) {
2041 if (ssh
->state
== SSH_STATE_CLOSED
) {
2044 ssh
->protocol(ssh
, NULL
, 0, 1);
2045 if (ssh
->state
== SSH_STATE_CLOSED
) {
2055 static void ssh_do_close(Ssh ssh
)
2058 struct ssh_channel
*c
;
2060 ssh
->state
= SSH_STATE_CLOSED
;
2066 * Now we must shut down any port and X forwardings going
2067 * through this connection.
2069 if (ssh
->channels
) {
2070 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
2073 x11_close(c
->u
.x11
.s
);
2076 pfd_close(c
->u
.pfd
.s
);
2079 del234(ssh
->channels
, c
);
2080 if (ssh
->version
== 2)
2081 bufchain_clear(&c
->v
.v2
.outbuffer
);
2087 static int ssh_closing(Plug plug
, const char *error_msg
, int error_code
,
2090 Ssh ssh
= (Ssh
) plug
;
2093 /* A socket error has occurred. */
2094 logevent(error_msg
);
2095 connection_fatal(ssh
->frontend
, "%s", error_msg
);
2097 /* Otherwise, the remote side closed the connection normally. */
2102 static int ssh_receive(Plug plug
, int urgent
, char *data
, int len
)
2104 Ssh ssh
= (Ssh
) plug
;
2105 ssh_gotdata(ssh
, (unsigned char *)data
, len
);
2106 if (ssh
->state
== SSH_STATE_CLOSED
) {
2113 static void ssh_sent(Plug plug
, int bufsize
)
2115 Ssh ssh
= (Ssh
) plug
;
2117 * If the send backlog on the SSH socket itself clears, we
2118 * should unthrottle the whole world if it was throttled.
2120 if (bufsize
< SSH_MAX_BACKLOG
)
2121 ssh_throttle_all(ssh
, 0, bufsize
);
2125 * Connect to specified host and port.
2126 * Returns an error message, or NULL on success.
2127 * Also places the canonical host name into `realhost'. It must be
2128 * freed by the caller.
2130 static const char *connect_to_host(Ssh ssh
, char *host
, int port
,
2131 char **realhost
, int nodelay
)
2133 static const struct plug_function_table fn_table
= {
2143 ssh
->savedhost
= snewn(1 + strlen(host
), char);
2144 if (!ssh
->savedhost
)
2145 fatalbox("Out of memory");
2146 strcpy(ssh
->savedhost
, host
);
2149 port
= 22; /* default ssh port */
2150 ssh
->savedport
= port
;
2155 logeventf(ssh
, "Looking up host \"%s\"", host
);
2156 addr
= name_lookup(host
, port
, realhost
, &ssh
->cfg
);
2157 if ((err
= sk_addr_error(addr
)) != NULL
) {
2167 sk_getaddr(addr
, addrbuf
, 100);
2168 logeventf(ssh
, "Connecting to %s port %d", addrbuf
, port
);
2170 ssh
->fn
= &fn_table
;
2171 ssh
->s
= new_connection(addr
, *realhost
, port
,
2172 0, 1, nodelay
, (Plug
) ssh
, &ssh
->cfg
);
2173 if ((err
= sk_socket_error(ssh
->s
)) != NULL
) {
2182 * Throttle or unthrottle the SSH connection.
2184 static void ssh1_throttle(Ssh ssh
, int adjust
)
2186 int old_count
= ssh
->v1_throttle_count
;
2187 ssh
->v1_throttle_count
+= adjust
;
2188 assert(ssh
->v1_throttle_count
>= 0);
2189 if (ssh
->v1_throttle_count
&& !old_count
) {
2190 sk_set_frozen(ssh
->s
, 1);
2191 } else if (!ssh
->v1_throttle_count
&& old_count
) {
2192 sk_set_frozen(ssh
->s
, 0);
2197 * Throttle or unthrottle _all_ local data streams (for when sends
2198 * on the SSH connection itself back up).
2200 static void ssh_throttle_all(Ssh ssh
, int enable
, int bufsize
)
2203 struct ssh_channel
*c
;
2205 if (enable
== ssh
->throttled_all
)
2207 ssh
->throttled_all
= enable
;
2208 ssh
->overall_bufsize
= bufsize
;
2211 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
2213 case CHAN_MAINSESSION
:
2215 * This is treated separately, outside the switch.
2219 x11_override_throttle(c
->u
.x11
.s
, enable
);
2222 /* Agent channels require no buffer management. */
2225 pfd_override_throttle(c
->u
.pfd
.s
, enable
);
2232 * Username and password input, abstracted off into routines
2233 * reusable in several places - even between SSH1 and SSH2.
2236 /* Set up a username or password input loop on a given buffer. */
2237 static void setup_userpass_input(Ssh ssh
, char *buffer
, int buflen
, int echo
)
2239 ssh
->userpass_input_buffer
= buffer
;
2240 ssh
->userpass_input_buflen
= buflen
;
2241 ssh
->userpass_input_bufpos
= 0;
2242 ssh
->userpass_input_echo
= echo
;
2246 * Process some terminal data in the course of username/password
2247 * input. Returns >0 for success (line of input returned in
2248 * buffer), <0 for failure (user hit ^C/^D, bomb out and exit), 0
2249 * for inconclusive (keep waiting for more input please).
2251 static int process_userpass_input(Ssh ssh
, unsigned char *in
, int inlen
)
2256 switch (c
= *in
++) {
2259 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
] = 0;
2260 ssh
->userpass_input_buffer
[ssh
->userpass_input_buflen
-1] = 0;
2265 if (ssh
->userpass_input_bufpos
> 0) {
2266 if (ssh
->userpass_input_echo
)
2267 c_write_str(ssh
, "\b \b");
2268 ssh
->userpass_input_bufpos
--;
2273 while (ssh
->userpass_input_bufpos
> 0) {
2274 if (ssh
->userpass_input_echo
)
2275 c_write_str(ssh
, "\b \b");
2276 ssh
->userpass_input_bufpos
--;
2285 * This simplistic check for printability is disabled
2286 * when we're doing password input, because some people
2287 * have control characters in their passwords.o
2289 if ((!ssh
->userpass_input_echo
||
2290 (c
>= ' ' && c
<= '~') ||
2291 ((unsigned char) c
>= 160))
2292 && ssh
->userpass_input_bufpos
< ssh
->userpass_input_buflen
-1) {
2293 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
++] = c
;
2294 if (ssh
->userpass_input_echo
)
2295 c_write(ssh
, &c
, 1);
2303 static void ssh_agent_callback(void *sshv
, void *reply
, int replylen
)
2305 Ssh ssh
= (Ssh
) sshv
;
2307 ssh
->agent_response
= reply
;
2308 ssh
->agent_response_len
= replylen
;
2310 if (ssh
->version
== 1)
2311 do_ssh1_login(ssh
, NULL
, -1, 0);
2313 do_ssh2_authconn(ssh
, NULL
, -1, 0);
2316 static void ssh_agentf_callback(void *cv
, void *reply
, int replylen
)
2318 struct ssh_channel
*c
= (struct ssh_channel
*)cv
;
2320 void *sentreply
= reply
;
2323 /* Fake SSH_AGENT_FAILURE. */
2324 sentreply
= "\0\0\0\1\5";
2327 if (ssh
->version
== 2) {
2328 ssh2_add_channel_data(c
, sentreply
, replylen
);
2331 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
2332 PKT_INT
, c
->remoteid
,
2334 PKT_DATA
, sentreply
, replylen
,
2342 * Handle the key exchange and user authentication phases.
2344 static int do_ssh1_login(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
2347 unsigned char cookie
[8];
2348 struct RSAKey servkey
, hostkey
;
2349 struct MD5Context md5c
;
2350 struct do_ssh1_login_state
{
2352 unsigned char *rsabuf
, *keystr1
, *keystr2
;
2353 unsigned long supported_ciphers_mask
, supported_auths_mask
;
2354 int tried_publickey
, tried_agent
;
2355 int tis_auth_refused
, ccard_auth_refused
;
2356 unsigned char session_id
[16];
2359 void *publickey_blob
;
2360 int publickey_bloblen
;
2366 unsigned char request
[5], *response
, *p
;
2375 crState(do_ssh1_login_state
);
2377 crBegin(ssh
->do_ssh1_login_crstate
);
2382 if (ssh
->pktin
.type
!= SSH1_SMSG_PUBLIC_KEY
) {
2383 bombout(("Public key packet not received"));
2387 logevent("Received public keys");
2389 memcpy(cookie
, ssh
->pktin
.body
, 8);
2391 i
= makekey(ssh
->pktin
.body
+ 8, &servkey
, &s
->keystr1
, 0);
2392 j
= makekey(ssh
->pktin
.body
+ 8 + i
, &hostkey
, &s
->keystr2
, 0);
2395 * Log the host key fingerprint.
2399 logevent("Host key fingerprint is:");
2400 strcpy(logmsg
, " ");
2401 hostkey
.comment
= NULL
;
2402 rsa_fingerprint(logmsg
+ strlen(logmsg
),
2403 sizeof(logmsg
) - strlen(logmsg
), &hostkey
);
2407 ssh
->v1_remote_protoflags
= GET_32BIT(ssh
->pktin
.body
+ 8 + i
+ j
);
2408 s
->supported_ciphers_mask
= GET_32BIT(ssh
->pktin
.body
+ 12 + i
+ j
);
2409 s
->supported_auths_mask
= GET_32BIT(ssh
->pktin
.body
+ 16 + i
+ j
);
2411 ssh
->v1_local_protoflags
=
2412 ssh
->v1_remote_protoflags
& SSH1_PROTOFLAGS_SUPPORTED
;
2413 ssh
->v1_local_protoflags
|= SSH1_PROTOFLAG_SCREEN_NUMBER
;
2416 MD5Update(&md5c
, s
->keystr2
, hostkey
.bytes
);
2417 MD5Update(&md5c
, s
->keystr1
, servkey
.bytes
);
2418 MD5Update(&md5c
, ssh
->pktin
.body
, 8);
2419 MD5Final(s
->session_id
, &md5c
);
2421 for (i
= 0; i
< 32; i
++)
2422 ssh
->session_key
[i
] = random_byte();
2424 s
->len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
2426 s
->rsabuf
= snewn(s
->len
, unsigned char);
2428 fatalbox("Out of memory");
2431 * Verify the host key.
2435 * First format the key into a string.
2437 int len
= rsastr_len(&hostkey
);
2438 char fingerprint
[100];
2439 char *keystr
= snewn(len
, char);
2441 fatalbox("Out of memory");
2442 rsastr_fmt(keystr
, &hostkey
);
2443 rsa_fingerprint(fingerprint
, sizeof(fingerprint
), &hostkey
);
2444 verify_ssh_host_key(ssh
->frontend
,
2445 ssh
->savedhost
, ssh
->savedport
, "rsa", keystr
,
2450 for (i
= 0; i
< 32; i
++) {
2451 s
->rsabuf
[i
] = ssh
->session_key
[i
];
2453 s
->rsabuf
[i
] ^= s
->session_id
[i
];
2456 if (hostkey
.bytes
> servkey
.bytes
) {
2457 rsaencrypt(s
->rsabuf
, 32, &servkey
);
2458 rsaencrypt(s
->rsabuf
, servkey
.bytes
, &hostkey
);
2460 rsaencrypt(s
->rsabuf
, 32, &hostkey
);
2461 rsaencrypt(s
->rsabuf
, hostkey
.bytes
, &servkey
);
2464 logevent("Encrypted session key");
2467 int cipher_chosen
= 0, warn
= 0;
2468 char *cipher_string
= NULL
;
2470 for (i
= 0; !cipher_chosen
&& i
< CIPHER_MAX
; i
++) {
2471 int next_cipher
= ssh
->cfg
.ssh_cipherlist
[i
];
2472 if (next_cipher
== CIPHER_WARN
) {
2473 /* If/when we choose a cipher, warn about it */
2475 } else if (next_cipher
== CIPHER_AES
) {
2476 /* XXX Probably don't need to mention this. */
2477 logevent("AES not supported in SSH1, skipping");
2479 switch (next_cipher
) {
2480 case CIPHER_3DES
: s
->cipher_type
= SSH_CIPHER_3DES
;
2481 cipher_string
= "3DES"; break;
2482 case CIPHER_BLOWFISH
: s
->cipher_type
= SSH_CIPHER_BLOWFISH
;
2483 cipher_string
= "Blowfish"; break;
2484 case CIPHER_DES
: s
->cipher_type
= SSH_CIPHER_DES
;
2485 cipher_string
= "single-DES"; break;
2487 if (s
->supported_ciphers_mask
& (1 << s
->cipher_type
))
2491 if (!cipher_chosen
) {
2492 if ((s
->supported_ciphers_mask
& (1 << SSH_CIPHER_3DES
)) == 0)
2493 bombout(("Server violates SSH 1 protocol by not "
2494 "supporting 3DES encryption"));
2496 /* shouldn't happen */
2497 bombout(("No supported ciphers found"));
2501 /* Warn about chosen cipher if necessary. */
2503 askcipher(ssh
->frontend
, cipher_string
, 0);
2506 switch (s
->cipher_type
) {
2507 case SSH_CIPHER_3DES
:
2508 logevent("Using 3DES encryption");
2510 case SSH_CIPHER_DES
:
2511 logevent("Using single-DES encryption");
2513 case SSH_CIPHER_BLOWFISH
:
2514 logevent("Using Blowfish encryption");
2518 send_packet(ssh
, SSH1_CMSG_SESSION_KEY
,
2519 PKT_CHAR
, s
->cipher_type
,
2520 PKT_DATA
, cookie
, 8,
2521 PKT_CHAR
, (s
->len
* 8) >> 8, PKT_CHAR
, (s
->len
* 8) & 0xFF,
2522 PKT_DATA
, s
->rsabuf
, s
->len
,
2523 PKT_INT
, ssh
->v1_local_protoflags
, PKT_END
);
2525 logevent("Trying to enable encryption...");
2529 ssh
->cipher
= (s
->cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish_ssh1
:
2530 s
->cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
2532 ssh
->v1_cipher_ctx
= ssh
->cipher
->make_context();
2533 ssh
->cipher
->sesskey(ssh
->v1_cipher_ctx
, ssh
->session_key
);
2534 logeventf(ssh
, "Initialised %s encryption", ssh
->cipher
->text_name
);
2536 ssh
->crcda_ctx
= crcda_make_context();
2537 logevent("Installing CRC compensation attack detector");
2539 if (servkey
.modulus
) {
2540 sfree(servkey
.modulus
);
2541 servkey
.modulus
= NULL
;
2543 if (servkey
.exponent
) {
2544 sfree(servkey
.exponent
);
2545 servkey
.exponent
= NULL
;
2547 if (hostkey
.modulus
) {
2548 sfree(hostkey
.modulus
);
2549 hostkey
.modulus
= NULL
;
2551 if (hostkey
.exponent
) {
2552 sfree(hostkey
.exponent
);
2553 hostkey
.exponent
= NULL
;
2557 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
) {
2558 bombout(("Encryption not successfully enabled"));
2562 logevent("Successfully started encryption");
2566 if ((flags
& FLAG_INTERACTIVE
) && !*ssh
->cfg
.username
) {
2567 if (ssh_get_line
&& !ssh_getline_pw_only
) {
2568 if (!ssh_get_line("login as: ",
2569 s
->username
, sizeof(s
->username
), FALSE
)) {
2571 * get_line failed to get a username.
2574 logevent("No username provided. Abandoning session.");
2575 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
2579 int ret
; /* need not be kept over crReturn */
2580 c_write_str(ssh
, "login as: ");
2583 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
2585 crWaitUntil(!ispkt
);
2586 ret
= process_userpass_input(ssh
, in
, inlen
);
2590 c_write_str(ssh
, "\r\n");
2593 strncpy(s
->username
, ssh
->cfg
.username
, sizeof(s
->username
));
2594 s
->username
[sizeof(s
->username
)-1] = '\0';
2597 send_packet(ssh
, SSH1_CMSG_USER
, PKT_STR
, s
->username
, PKT_END
);
2599 char userlog
[22 + sizeof(s
->username
)];
2600 sprintf(userlog
, "Sent username \"%s\"", s
->username
);
2602 if (flags
& FLAG_INTERACTIVE
&&
2603 (!((flags
& FLAG_STDERR
) && (flags
& FLAG_VERBOSE
)))) {
2604 strcat(userlog
, "\r\n");
2605 c_write_str(ssh
, userlog
);
2612 if ((ssh
->remote_bugs
& BUG_CHOKES_ON_RSA
)) {
2613 /* We must not attempt PK auth. Pretend we've already tried it. */
2614 s
->tried_publickey
= s
->tried_agent
= 1;
2616 s
->tried_publickey
= s
->tried_agent
= 0;
2618 s
->tis_auth_refused
= s
->ccard_auth_refused
= 0;
2619 /* Load the public half of ssh->cfg.keyfile so we notice if it's in Pageant */
2620 if (!filename_is_null(ssh
->cfg
.keyfile
)) {
2621 if (!rsakey_pubblob(&ssh
->cfg
.keyfile
,
2622 &s
->publickey_blob
, &s
->publickey_bloblen
, NULL
))
2623 s
->publickey_blob
= NULL
;
2625 s
->publickey_blob
= NULL
;
2627 while (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
2628 s
->pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
2630 if (agent_exists() && !s
->tried_agent
) {
2632 * Attempt RSA authentication using Pageant.
2638 logevent("Pageant is running. Requesting keys.");
2640 /* Request the keys held by the agent. */
2641 PUT_32BIT(s
->request
, 1);
2642 s
->request
[4] = SSH1_AGENTC_REQUEST_RSA_IDENTITIES
;
2643 if (!agent_query(s
->request
, 5, &r
, &s
->responselen
,
2644 ssh_agent_callback
, ssh
)) {
2648 bombout(("Unexpected data from server while waiting"
2649 " for agent response"));
2652 } while (ispkt
|| inlen
> 0);
2653 r
= ssh
->agent_response
;
2654 s
->responselen
= ssh
->agent_response_len
;
2656 s
->response
= (unsigned char *) r
;
2657 if (s
->response
&& s
->responselen
>= 5 &&
2658 s
->response
[4] == SSH1_AGENT_RSA_IDENTITIES_ANSWER
) {
2659 s
->p
= s
->response
+ 5;
2660 s
->nkeys
= GET_32BIT(s
->p
);
2664 sprintf(buf
, "Pageant has %d SSH1 keys", s
->nkeys
);
2667 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
2670 sprintf(buf
, "Trying Pageant key #%d", s
->keyi
);
2673 if (s
->publickey_blob
&&
2674 !memcmp(s
->p
, s
->publickey_blob
,
2675 s
->publickey_bloblen
)) {
2676 logevent("This key matches configured key file");
2677 s
->tried_publickey
= 1;
2680 s
->p
+= ssh1_read_bignum(s
->p
, &s
->key
.exponent
);
2681 s
->p
+= ssh1_read_bignum(s
->p
, &s
->key
.modulus
);
2682 s
->commentlen
= GET_32BIT(s
->p
);
2684 s
->commentp
= (char *)s
->p
;
2685 s
->p
+= s
->commentlen
;
2686 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
2687 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
2689 if (ssh
->pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
2690 logevent("Key refused");
2693 logevent("Received RSA challenge");
2694 ssh1_read_bignum(ssh
->pktin
.body
, &s
->challenge
);
2696 char *agentreq
, *q
, *ret
;
2699 len
= 1 + 4; /* message type, bit count */
2700 len
+= ssh1_bignum_length(s
->key
.exponent
);
2701 len
+= ssh1_bignum_length(s
->key
.modulus
);
2702 len
+= ssh1_bignum_length(s
->challenge
);
2703 len
+= 16; /* session id */
2704 len
+= 4; /* response format */
2705 agentreq
= snewn(4 + len
, char);
2706 PUT_32BIT(agentreq
, len
);
2708 *q
++ = SSH1_AGENTC_RSA_CHALLENGE
;
2709 PUT_32BIT(q
, bignum_bitcount(s
->key
.modulus
));
2711 q
+= ssh1_write_bignum(q
, s
->key
.exponent
);
2712 q
+= ssh1_write_bignum(q
, s
->key
.modulus
);
2713 q
+= ssh1_write_bignum(q
, s
->challenge
);
2714 memcpy(q
, s
->session_id
, 16);
2716 PUT_32BIT(q
, 1); /* response format */
2717 if (!agent_query(agentreq
, len
+ 4, &vret
, &retlen
,
2718 ssh_agent_callback
, ssh
)) {
2723 bombout(("Unexpected data from server"
2724 " while waiting for agent"
2728 } while (ispkt
|| inlen
> 0);
2729 vret
= ssh
->agent_response
;
2730 retlen
= ssh
->agent_response_len
;
2735 if (ret
[4] == SSH1_AGENT_RSA_RESPONSE
) {
2736 logevent("Sending Pageant's response");
2737 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
2738 PKT_DATA
, ret
+ 5, 16,
2742 if (ssh
->pktin
.type
== SSH1_SMSG_SUCCESS
) {
2744 ("Pageant's response accepted");
2745 if (flags
& FLAG_VERBOSE
) {
2746 c_write_str(ssh
, "Authenticated using"
2748 c_write(ssh
, s
->commentp
,
2750 c_write_str(ssh
, "\" from agent\r\n");
2755 ("Pageant's response not accepted");
2758 ("Pageant failed to answer challenge");
2762 logevent("No reply received from Pageant");
2765 freebn(s
->key
.exponent
);
2766 freebn(s
->key
.modulus
);
2767 freebn(s
->challenge
);
2776 if (!filename_is_null(ssh
->cfg
.keyfile
) && !s
->tried_publickey
)
2777 s
->pwpkt_type
= SSH1_CMSG_AUTH_RSA
;
2779 if (ssh
->cfg
.try_tis_auth
&&
2780 (s
->supported_auths_mask
& (1 << SSH1_AUTH_TIS
)) &&
2781 !s
->tis_auth_refused
) {
2782 s
->pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
2783 logevent("Requested TIS authentication");
2784 send_packet(ssh
, SSH1_CMSG_AUTH_TIS
, PKT_END
);
2786 if (ssh
->pktin
.type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
2787 logevent("TIS authentication declined");
2788 if (flags
& FLAG_INTERACTIVE
)
2789 c_write_str(ssh
, "TIS authentication refused.\r\n");
2790 s
->tis_auth_refused
= 1;
2793 int challengelen
= GET_32BIT(ssh
->pktin
.body
);
2794 logevent("Received TIS challenge");
2795 if (challengelen
> sizeof(s
->prompt
) - 1)
2796 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
2797 memcpy(s
->prompt
, ssh
->pktin
.body
+ 4, challengelen
);
2798 /* Prompt heuristic comes from OpenSSH */
2799 strncpy(s
->prompt
+ challengelen
,
2800 memchr(s
->prompt
, '\n', challengelen
) ?
2801 "": "\r\nResponse: ",
2802 (sizeof s
->prompt
) - challengelen
);
2803 s
->prompt
[(sizeof s
->prompt
) - 1] = '\0';
2806 if (ssh
->cfg
.try_tis_auth
&&
2807 (s
->supported_auths_mask
& (1 << SSH1_AUTH_CCARD
)) &&
2808 !s
->ccard_auth_refused
) {
2809 s
->pwpkt_type
= SSH1_CMSG_AUTH_CCARD_RESPONSE
;
2810 logevent("Requested CryptoCard authentication");
2811 send_packet(ssh
, SSH1_CMSG_AUTH_CCARD
, PKT_END
);
2813 if (ssh
->pktin
.type
!= SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
2814 logevent("CryptoCard authentication declined");
2815 c_write_str(ssh
, "CryptoCard authentication refused.\r\n");
2816 s
->ccard_auth_refused
= 1;
2819 int challengelen
= GET_32BIT(ssh
->pktin
.body
);
2820 logevent("Received CryptoCard challenge");
2821 if (challengelen
> sizeof(s
->prompt
) - 1)
2822 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
2823 memcpy(s
->prompt
, ssh
->pktin
.body
+ 4, challengelen
);
2824 strncpy(s
->prompt
+ challengelen
,
2825 memchr(s
->prompt
, '\n', challengelen
) ?
2826 "" : "\r\nResponse: ",
2827 sizeof(s
->prompt
) - challengelen
);
2828 s
->prompt
[sizeof(s
->prompt
) - 1] = '\0';
2831 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
2832 sprintf(s
->prompt
, "%.90s@%.90s's password: ",
2833 s
->username
, ssh
->savedhost
);
2835 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
2836 char *comment
= NULL
;
2839 if (flags
& FLAG_VERBOSE
)
2840 c_write_str(ssh
, "Trying public key authentication.\r\n");
2841 logeventf(ssh
, "Trying public key \"%s\"",
2842 filename_to_str(&ssh
->cfg
.keyfile
));
2843 type
= key_type(&ssh
->cfg
.keyfile
);
2844 if (type
!= SSH_KEYTYPE_SSH1
) {
2845 sprintf(msgbuf
, "Key is of wrong type (%s)",
2846 key_type_to_str(type
));
2848 c_write_str(ssh
, msgbuf
);
2849 c_write_str(ssh
, "\r\n");
2850 s
->tried_publickey
= 1;
2853 if (!rsakey_encrypted(&ssh
->cfg
.keyfile
, &comment
)) {
2854 if (flags
& FLAG_VERBOSE
)
2855 c_write_str(ssh
, "No passphrase required.\r\n");
2858 sprintf(s
->prompt
, "Passphrase for key \"%.100s\": ", comment
);
2863 * Show password prompt, having first obtained it via a TIS
2864 * or CryptoCard exchange if we're doing TIS or CryptoCard
2868 if (!ssh_get_line(s
->prompt
, s
->password
,
2869 sizeof(s
->password
), TRUE
)) {
2871 * get_line failed to get a password (for example
2872 * because one was supplied on the command line
2873 * which has already failed to work). Terminate.
2875 send_packet(ssh
, SSH1_MSG_DISCONNECT
,
2876 PKT_STR
, "No more passwords available to try",
2878 logevent("Unable to authenticate");
2879 connection_fatal(ssh
->frontend
, "Unable to authenticate");
2880 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
2884 /* Prompt may have come from server. We've munged it a bit, so
2885 * we know it to be zero-terminated at least once. */
2886 int ret
; /* need not be saved over crReturn */
2887 c_write_untrusted(ssh
, s
->prompt
, strlen(s
->prompt
));
2890 setup_userpass_input(ssh
, s
->password
, sizeof(s
->password
), 0);
2892 crWaitUntil(!ispkt
);
2893 ret
= process_userpass_input(ssh
, in
, inlen
);
2897 c_write_str(ssh
, "\r\n");
2901 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
2903 * Try public key authentication with the specified
2906 s
->tried_publickey
= 1;
2909 const char *error
= NULL
;
2910 int ret
= loadrsakey(&ssh
->cfg
.keyfile
, &s
->key
, s
->password
,
2913 c_write_str(ssh
, "Couldn't load private key from ");
2914 c_write_str(ssh
, filename_to_str(&ssh
->cfg
.keyfile
));
2915 c_write_str(ssh
, " (");
2916 c_write_str(ssh
, error
);
2917 c_write_str(ssh
, ").\r\n");
2918 continue; /* go and try password */
2921 c_write_str(ssh
, "Wrong passphrase.\r\n");
2922 s
->tried_publickey
= 0;
2923 continue; /* try again */
2928 * Send a public key attempt.
2930 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
2931 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
2934 if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
2935 c_write_str(ssh
, "Server refused our public key.\r\n");
2936 continue; /* go and try password */
2938 if (ssh
->pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
2939 bombout(("Bizarre response to offer of public key"));
2945 unsigned char buffer
[32];
2946 Bignum challenge
, response
;
2948 ssh1_read_bignum(ssh
->pktin
.body
, &challenge
);
2949 response
= rsadecrypt(challenge
, &s
->key
);
2950 freebn(s
->key
.private_exponent
);/* burn the evidence */
2952 for (i
= 0; i
< 32; i
++) {
2953 buffer
[i
] = bignum_byte(response
, 31 - i
);
2957 MD5Update(&md5c
, buffer
, 32);
2958 MD5Update(&md5c
, s
->session_id
, 16);
2959 MD5Final(buffer
, &md5c
);
2961 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
2962 PKT_DATA
, buffer
, 16, PKT_END
);
2969 if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
2970 if (flags
& FLAG_VERBOSE
)
2971 c_write_str(ssh
, "Failed to authenticate with"
2972 " our public key.\r\n");
2973 continue; /* go and try password */
2974 } else if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
) {
2975 bombout(("Bizarre response to RSA authentication response"));
2979 break; /* we're through! */
2981 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
2983 * Defence against traffic analysis: we send a
2984 * whole bunch of packets containing strings of
2985 * different lengths. One of these strings is the
2986 * password, in a SSH1_CMSG_AUTH_PASSWORD packet.
2987 * The others are all random data in
2988 * SSH1_MSG_IGNORE packets. This way a passive
2989 * listener can't tell which is the password, and
2990 * hence can't deduce the password length.
2992 * Anybody with a password length greater than 16
2993 * bytes is going to have enough entropy in their
2994 * password that a listener won't find it _that_
2995 * much help to know how long it is. So what we'll
2998 * - if password length < 16, we send 15 packets
2999 * containing string lengths 1 through 15
3001 * - otherwise, we let N be the nearest multiple
3002 * of 8 below the password length, and send 8
3003 * packets containing string lengths N through
3004 * N+7. This won't obscure the order of
3005 * magnitude of the password length, but it will
3006 * introduce a bit of extra uncertainty.
3008 * A few servers (the old 1.2.18 through 1.2.22)
3009 * can't deal with SSH1_MSG_IGNORE. For these
3010 * servers, we need an alternative defence. We make
3011 * use of the fact that the password is interpreted
3012 * as a C string: so we can append a NUL, then some
3015 * One server (a Cisco one) can deal with neither
3016 * SSH1_MSG_IGNORE _nor_ a padded password string.
3017 * For this server we are left with no defences
3018 * against password length sniffing.
3020 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
)) {
3022 * The server can deal with SSH1_MSG_IGNORE, so
3023 * we can use the primary defence.
3025 int bottom
, top
, pwlen
, i
;
3028 pwlen
= strlen(s
->password
);
3030 bottom
= 0; /* zero length passwords are OK! :-) */
3033 bottom
= pwlen
& ~7;
3037 assert(pwlen
>= bottom
&& pwlen
<= top
);
3039 randomstr
= snewn(top
+ 1, char);
3041 for (i
= bottom
; i
<= top
; i
++) {
3043 defer_packet(ssh
, s
->pwpkt_type
,
3044 PKT_STR
, s
->password
, PKT_END
);
3046 for (j
= 0; j
< i
; j
++) {
3048 randomstr
[j
] = random_byte();
3049 } while (randomstr
[j
] == '\0');
3051 randomstr
[i
] = '\0';
3052 defer_packet(ssh
, SSH1_MSG_IGNORE
,
3053 PKT_STR
, randomstr
, PKT_END
);
3056 logevent("Sending password with camouflage packets");
3057 ssh_pkt_defersend(ssh
);
3060 else if (!(ssh
->remote_bugs
& BUG_NEEDS_SSH1_PLAIN_PASSWORD
)) {
3062 * The server can't deal with SSH1_MSG_IGNORE
3063 * but can deal with padded passwords, so we
3064 * can use the secondary defence.
3070 len
= strlen(s
->password
);
3071 if (len
< sizeof(string
)) {
3073 strcpy(string
, s
->password
);
3074 len
++; /* cover the zero byte */
3075 while (len
< sizeof(string
)) {
3076 string
[len
++] = (char) random_byte();
3081 logevent("Sending length-padded password");
3082 send_packet(ssh
, s
->pwpkt_type
, PKT_INT
, len
,
3083 PKT_DATA
, ss
, len
, PKT_END
);
3086 * The server has _both_
3087 * BUG_CHOKES_ON_SSH1_IGNORE and
3088 * BUG_NEEDS_SSH1_PLAIN_PASSWORD. There is
3089 * therefore nothing we can do.
3092 len
= strlen(s
->password
);
3093 logevent("Sending unpadded password");
3094 send_packet(ssh
, s
->pwpkt_type
, PKT_INT
, len
,
3095 PKT_DATA
, s
->password
, len
, PKT_END
);
3098 send_packet(ssh
, s
->pwpkt_type
, PKT_STR
, s
->password
, PKT_END
);
3101 logevent("Sent password");
3102 memset(s
->password
, 0, strlen(s
->password
));
3104 if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3105 if (flags
& FLAG_VERBOSE
)
3106 c_write_str(ssh
, "Access denied\r\n");
3107 logevent("Authentication refused");
3108 } else if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
) {
3109 bombout(("Strange packet received, type %d", ssh
->pktin
.type
));
3114 logevent("Authentication successful");
3119 void sshfwd_close(struct ssh_channel
*c
)
3123 if (ssh
->state
!= SSH_STATE_SESSION
) {
3124 assert(ssh
->state
== SSH_STATE_CLOSED
);
3128 if (c
&& !c
->closes
) {
3130 * If the channel's remoteid is -1, we have sent
3131 * CHANNEL_OPEN for this channel, but it hasn't even been
3132 * acknowledged by the server. So we must set a close flag
3133 * on it now, and then when the server acks the channel
3134 * open, we can close it then.
3136 if (((int)c
->remoteid
) != -1) {
3137 if (ssh
->version
== 1) {
3138 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
, PKT_INT
, c
->remoteid
,
3141 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_CLOSE
);
3142 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
3146 c
->closes
= 1; /* sent MSG_CLOSE */
3147 if (c
->type
== CHAN_X11
) {
3149 logevent("Forwarded X11 connection terminated");
3150 } else if (c
->type
== CHAN_SOCKDATA
||
3151 c
->type
== CHAN_SOCKDATA_DORMANT
) {
3153 logevent("Forwarded port closed");
3158 int sshfwd_write(struct ssh_channel
*c
, char *buf
, int len
)
3162 if (ssh
->state
!= SSH_STATE_SESSION
) {
3163 assert(ssh
->state
== SSH_STATE_CLOSED
);
3167 if (ssh
->version
== 1) {
3168 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
3169 PKT_INT
, c
->remoteid
,
3170 PKT_INT
, len
, PKT_DATA
, buf
, len
, PKT_END
);
3172 * In SSH1 we can return 0 here - implying that forwarded
3173 * connections are never individually throttled - because
3174 * the only circumstance that can cause throttling will be
3175 * the whole SSH connection backing up, in which case
3176 * _everything_ will be throttled as a whole.
3180 ssh2_add_channel_data(c
, buf
, len
);
3181 return ssh2_try_send(c
);
3185 void sshfwd_unthrottle(struct ssh_channel
*c
, int bufsize
)
3189 if (ssh
->state
!= SSH_STATE_SESSION
) {
3190 assert(ssh
->state
== SSH_STATE_CLOSED
);
3194 if (ssh
->version
== 1) {
3195 if (c
->v
.v1
.throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
3196 c
->v
.v1
.throttling
= 0;
3197 ssh1_throttle(ssh
, -1);
3200 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
3204 static void ssh1_protocol(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
3206 crBegin(ssh
->ssh1_protocol_crstate
);
3210 while (!do_ssh1_login(ssh
, in
, inlen
, ispkt
)) {
3213 if (ssh
->state
== SSH_STATE_CLOSED
)
3216 if (ssh
->cfg
.agentfwd
&& agent_exists()) {
3217 logevent("Requesting agent forwarding");
3218 send_packet(ssh
, SSH1_CMSG_AGENT_REQUEST_FORWARDING
, PKT_END
);
3222 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3223 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3224 bombout(("Protocol confusion"));
3226 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3227 logevent("Agent forwarding refused");
3229 logevent("Agent forwarding enabled");
3230 ssh
->agentfwd_enabled
= TRUE
;
3234 if (ssh
->cfg
.x11_forward
) {
3235 char proto
[20], data
[64];
3236 logevent("Requesting X11 forwarding");
3237 ssh
->x11auth
= x11_invent_auth(proto
, sizeof(proto
),
3238 data
, sizeof(data
), ssh
->cfg
.x11_auth
);
3239 x11_get_real_auth(ssh
->x11auth
, ssh
->cfg
.x11_display
);
3240 if (ssh
->v1_local_protoflags
& SSH1_PROTOFLAG_SCREEN_NUMBER
) {
3241 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
3242 PKT_STR
, proto
, PKT_STR
, data
,
3243 PKT_INT
, x11_get_screen_number(ssh
->cfg
.x11_display
),
3246 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
3247 PKT_STR
, proto
, PKT_STR
, data
, PKT_END
);
3252 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3253 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3254 bombout(("Protocol confusion"));
3256 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3257 logevent("X11 forwarding refused");
3259 logevent("X11 forwarding enabled");
3260 ssh
->X11_fwd_enabled
= TRUE
;
3267 int sport
,dport
,sserv
,dserv
;
3268 char sports
[256], dports
[256], saddr
[256], host
[256];
3270 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh1
);
3271 /* Add port forwardings. */
3272 ssh
->portfwd_strptr
= ssh
->cfg
.portfwd
;
3273 while (*ssh
->portfwd_strptr
) {
3274 type
= *ssh
->portfwd_strptr
++;
3277 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= '\t') {
3278 if (*ssh
->portfwd_strptr
== ':') {
3280 * We've seen a colon in the middle of the
3281 * source port number. This means that
3282 * everything we've seen until now is the
3283 * source _address_, so we'll move it into
3284 * saddr and start sports from the beginning
3287 ssh
->portfwd_strptr
++;
3289 strcpy(saddr
, sports
);
3292 if (n
< 255) sports
[n
++] = *ssh
->portfwd_strptr
++;
3296 if (*ssh
->portfwd_strptr
== '\t')
3297 ssh
->portfwd_strptr
++;
3299 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= ':') {
3300 if (n
< 255) host
[n
++] = *ssh
->portfwd_strptr
++;
3303 if (*ssh
->portfwd_strptr
== ':')
3304 ssh
->portfwd_strptr
++;
3306 while (*ssh
->portfwd_strptr
) {
3307 if (n
< 255) dports
[n
++] = *ssh
->portfwd_strptr
++;
3310 ssh
->portfwd_strptr
++;
3311 dport
= atoi(dports
);
3315 dport
= net_service_lookup(dports
);
3317 logeventf(ssh
, "Service lookup failed for"
3318 " destination port \"%s\"", dports
);
3322 while (*ssh
->portfwd_strptr
) ssh
->portfwd_strptr
++;
3324 ssh
->portfwd_strptr
++; /* eat the NUL and move to next one */
3326 sport
= atoi(sports
);
3330 sport
= net_service_lookup(sports
);
3332 logeventf(ssh
, "Service lookup failed for source"
3333 " port \"%s\"", sports
);
3336 if (sport
&& dport
) {
3338 pfd_addforward(host
, dport
, *saddr ? saddr
: NULL
,
3339 sport
, ssh
, &ssh
->cfg
);
3340 logeventf(ssh
, "Local port %.*s%.*s%.*s%.*s%d%.*s"
3341 " forwarding to %s:%.*s%.*s%d%.*s",
3342 (int)(*saddr?
strlen(saddr
):0), *saddr?saddr
:NULL
,
3343 (int)(*saddr?
1:0), ":",
3344 (int)(sserv ?
strlen(sports
) : 0), sports
,
3345 sserv
, "(", sport
, sserv
, ")",
3347 (int)(dserv ?
strlen(dports
) : 0), dports
,
3348 dserv
, "(", dport
, dserv
, ")");
3349 } else if (type
== 'D') {
3350 pfd_addforward(NULL
, -1, *saddr ? saddr
: NULL
,
3351 sport
, ssh
, &ssh
->cfg
);
3352 logeventf(ssh
, "Local port %.*s%.*s%.*s%.*s%d%.*s"
3353 " doing SOCKS dynamic forwarding",
3354 (int)(*saddr?
strlen(saddr
):0), *saddr?saddr
:NULL
,
3355 (int)(*saddr?
1:0), ":",
3356 (int)(sserv ?
strlen(sports
) : 0), sports
,
3357 sserv
, "(", sport
, sserv
, ")");
3359 struct ssh_rportfwd
*pf
;
3360 pf
= snew(struct ssh_rportfwd
);
3361 strcpy(pf
->dhost
, host
);
3365 "SSH1 cannot handle source address spec \"%s:%d\"; ignoring",
3368 if (add234(ssh
->rportfwds
, pf
) != pf
) {
3370 "Duplicate remote port forwarding to %s:%d",
3374 logeventf(ssh
, "Requesting remote port %.*s%.*s%d%.*s"
3375 " forward to %s:%.*s%.*s%d%.*s",
3376 (int)(sserv ?
strlen(sports
) : 0), sports
,
3377 sserv
, "(", sport
, sserv
, ")",
3379 (int)(dserv ?
strlen(dports
) : 0), dports
,
3380 dserv
, "(", dport
, dserv
, ")");
3381 send_packet(ssh
, SSH1_CMSG_PORT_FORWARD_REQUEST
,
3389 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3390 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3391 bombout(("Protocol confusion"));
3393 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3394 c_write_str(ssh
, "Server refused port"
3397 logevent("Remote port forwarding enabled");
3404 if (!ssh
->cfg
.nopty
) {
3405 /* Unpick the terminal-speed string. */
3406 /* XXX perhaps we should allow no speeds to be sent. */
3407 ssh
->ospeed
= 38400; ssh
->ispeed
= 38400; /* last-resort defaults */
3408 sscanf(ssh
->cfg
.termspeed
, "%d,%d", &ssh
->ospeed
, &ssh
->ispeed
);
3409 /* Send the pty request. */
3410 send_packet(ssh
, SSH1_CMSG_REQUEST_PTY
,
3411 PKT_STR
, ssh
->cfg
.termtype
,
3412 PKT_INT
, ssh
->term_height
,
3413 PKT_INT
, ssh
->term_width
,
3414 PKT_INT
, 0, PKT_INT
, 0, /* width,height in pixels */
3415 PKT_CHAR
, 192, PKT_INT
, ssh
->ispeed
, /* TTY_OP_ISPEED */
3416 PKT_CHAR
, 193, PKT_INT
, ssh
->ospeed
, /* TTY_OP_OSPEED */
3417 PKT_CHAR
, 0, PKT_END
);
3418 ssh
->state
= SSH_STATE_INTERMED
;
3422 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3423 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3424 bombout(("Protocol confusion"));
3426 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3427 c_write_str(ssh
, "Server refused to allocate pty\r\n");
3428 ssh
->editing
= ssh
->echoing
= 1;
3430 logeventf(ssh
, "Allocated pty (ospeed %dbps, ispeed %dbps)",
3431 ssh
->ospeed
, ssh
->ispeed
);
3433 ssh
->editing
= ssh
->echoing
= 1;
3436 if (ssh
->cfg
.compression
) {
3437 send_packet(ssh
, SSH1_CMSG_REQUEST_COMPRESSION
, PKT_INT
, 6, PKT_END
);
3441 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3442 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3443 bombout(("Protocol confusion"));
3445 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3446 c_write_str(ssh
, "Server refused to compress\r\n");
3448 logevent("Started compression");
3449 ssh
->v1_compressing
= TRUE
;
3450 ssh
->cs_comp_ctx
= zlib_compress_init();
3451 logevent("Initialised zlib (RFC1950) compression");
3452 ssh
->sc_comp_ctx
= zlib_decompress_init();
3453 logevent("Initialised zlib (RFC1950) decompression");
3457 * Start the shell or command.
3459 * Special case: if the first-choice command is an SSH2
3460 * subsystem (hence not usable here) and the second choice
3461 * exists, we fall straight back to that.
3464 char *cmd
= ssh
->cfg
.remote_cmd_ptr
;
3466 if (ssh
->cfg
.ssh_subsys
&& ssh
->cfg
.remote_cmd_ptr2
) {
3467 cmd
= ssh
->cfg
.remote_cmd_ptr2
;
3468 ssh
->fallback_cmd
= TRUE
;
3471 send_packet(ssh
, SSH1_CMSG_EXEC_CMD
, PKT_STR
, cmd
, PKT_END
);
3473 send_packet(ssh
, SSH1_CMSG_EXEC_SHELL
, PKT_END
);
3474 logevent("Started session");
3477 ssh
->state
= SSH_STATE_SESSION
;
3478 if (ssh
->size_needed
)
3479 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
3480 if (ssh
->eof_needed
)
3481 ssh_special(ssh
, TS_EOF
);
3484 ldisc_send(ssh
->ldisc
, NULL
, 0, 0);/* cause ldisc to notice changes */
3486 ssh
->channels
= newtree234(ssh_channelcmp
);
3490 if (ssh
->pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
3491 ssh
->pktin
.type
== SSH1_SMSG_STDERR_DATA
) {
3492 long len
= GET_32BIT(ssh
->pktin
.body
);
3494 from_backend(ssh
->frontend
,
3495 ssh
->pktin
.type
== SSH1_SMSG_STDERR_DATA
,
3496 (char *)(ssh
->pktin
.body
) + 4, len
);
3497 if (!ssh
->v1_stdout_throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
3498 ssh
->v1_stdout_throttling
= 1;
3499 ssh1_throttle(ssh
, +1);
3501 } else if (ssh
->pktin
.type
== SSH1_MSG_DISCONNECT
) {
3502 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
3503 logevent("Received disconnect request");
3505 } else if (ssh
->pktin
.type
== SSH1_SMSG_X11_OPEN
) {
3506 /* Remote side is trying to open a channel to talk to our
3507 * X-Server. Give them back a local channel number. */
3508 struct ssh_channel
*c
;
3510 logevent("Received X11 connect request");
3511 /* Refuse if X11 forwarding is disabled. */
3512 if (!ssh
->X11_fwd_enabled
) {
3513 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3514 PKT_INT
, GET_32BIT(ssh
->pktin
.body
), PKT_END
);
3515 logevent("Rejected X11 connect request");
3517 c
= snew(struct ssh_channel
);
3520 if (x11_init(&c
->u
.x11
.s
, ssh
->cfg
.x11_display
, c
,
3521 ssh
->x11auth
, NULL
, -1, &ssh
->cfg
) != NULL
) {
3522 logevent("opening X11 forward connection failed");
3524 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3525 PKT_INT
, GET_32BIT(ssh
->pktin
.body
),
3529 ("opening X11 forward connection succeeded");
3530 c
->remoteid
= GET_32BIT(ssh
->pktin
.body
);
3531 c
->localid
= alloc_channel_id(ssh
);
3533 c
->v
.v1
.throttling
= 0;
3534 c
->type
= CHAN_X11
; /* identify channel type */
3535 add234(ssh
->channels
, c
);
3536 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3537 PKT_INT
, c
->remoteid
, PKT_INT
,
3538 c
->localid
, PKT_END
);
3539 logevent("Opened X11 forward channel");
3542 } else if (ssh
->pktin
.type
== SSH1_SMSG_AGENT_OPEN
) {
3543 /* Remote side is trying to open a channel to talk to our
3544 * agent. Give them back a local channel number. */
3545 struct ssh_channel
*c
;
3547 /* Refuse if agent forwarding is disabled. */
3548 if (!ssh
->agentfwd_enabled
) {
3549 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3550 PKT_INT
, GET_32BIT(ssh
->pktin
.body
), PKT_END
);
3552 c
= snew(struct ssh_channel
);
3554 c
->remoteid
= GET_32BIT(ssh
->pktin
.body
);
3555 c
->localid
= alloc_channel_id(ssh
);
3557 c
->v
.v1
.throttling
= 0;
3558 c
->type
= CHAN_AGENT
; /* identify channel type */
3559 c
->u
.a
.lensofar
= 0;
3560 add234(ssh
->channels
, c
);
3561 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3562 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
3565 } else if (ssh
->pktin
.type
== SSH1_MSG_PORT_OPEN
) {
3566 /* Remote side is trying to open a channel to talk to a
3567 * forwarded port. Give them back a local channel number. */
3568 struct ssh_channel
*c
;
3569 struct ssh_rportfwd pf
;
3571 char host
[256], buf
[1024];
3574 c
= snew(struct ssh_channel
);
3577 hostsize
= GET_32BIT(ssh
->pktin
.body
+4);
3578 for (h
= host
, p
= (char *)(ssh
->pktin
.body
+8);
3579 hostsize
!= 0; hostsize
--) {
3580 if (h
+1 < host
+sizeof(host
))
3585 port
= GET_32BIT(p
);
3587 strcpy(pf
.dhost
, host
);
3590 if (find234(ssh
->rportfwds
, &pf
, NULL
) == NULL
) {
3591 sprintf(buf
, "Rejected remote port open request for %s:%d",
3594 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3595 PKT_INT
, GET_32BIT(ssh
->pktin
.body
), PKT_END
);
3597 sprintf(buf
, "Received remote port open request for %s:%d",
3600 e
= pfd_newconnect(&c
->u
.pfd
.s
, host
, port
, c
, &ssh
->cfg
);
3603 sprintf(buf
, "Port open failed: %s", e
);
3606 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3607 PKT_INT
, GET_32BIT(ssh
->pktin
.body
),
3610 c
->remoteid
= GET_32BIT(ssh
->pktin
.body
);
3611 c
->localid
= alloc_channel_id(ssh
);
3613 c
->v
.v1
.throttling
= 0;
3614 c
->type
= CHAN_SOCKDATA
; /* identify channel type */
3615 add234(ssh
->channels
, c
);
3616 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3617 PKT_INT
, c
->remoteid
, PKT_INT
,
3618 c
->localid
, PKT_END
);
3619 logevent("Forwarded port opened successfully");
3623 } else if (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
) {
3624 unsigned int remoteid
= GET_32BIT(ssh
->pktin
.body
);
3625 unsigned int localid
= GET_32BIT(ssh
->pktin
.body
+4);
3626 struct ssh_channel
*c
;
3628 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
3629 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
3630 c
->remoteid
= localid
;
3631 c
->type
= CHAN_SOCKDATA
;
3632 c
->v
.v1
.throttling
= 0;
3633 pfd_confirm(c
->u
.pfd
.s
);
3636 if (c
&& c
->closes
) {
3638 * We have a pending close on this channel,
3639 * which we decided on before the server acked
3640 * the channel open. So now we know the
3641 * remoteid, we can close it again.
3643 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
,
3644 PKT_INT
, c
->remoteid
, PKT_END
);
3647 } else if (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_OPEN_FAILURE
) {
3648 unsigned int remoteid
= GET_32BIT(ssh
->pktin
.body
);
3649 struct ssh_channel
*c
;
3651 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
3652 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
3653 logevent("Forwarded connection refused by server");
3654 pfd_close(c
->u
.pfd
.s
);
3655 del234(ssh
->channels
, c
);
3659 } else if (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_CLOSE
||
3660 ssh
->pktin
.type
== SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
) {
3661 /* Remote side closes a channel. */
3662 unsigned i
= GET_32BIT(ssh
->pktin
.body
);
3663 struct ssh_channel
*c
;
3664 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
3665 if (c
&& ((int)c
->remoteid
) != -1) {
3668 (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_CLOSE ?
1 : 2);
3670 if ((c
->closes
== 0) && (c
->type
== CHAN_X11
)) {
3671 logevent("Forwarded X11 connection terminated");
3672 assert(c
->u
.x11
.s
!= NULL
);
3673 x11_close(c
->u
.x11
.s
);
3676 if ((c
->closes
== 0) && (c
->type
== CHAN_SOCKDATA
)) {
3677 logevent("Forwarded port closed");
3678 assert(c
->u
.pfd
.s
!= NULL
);
3679 pfd_close(c
->u
.pfd
.s
);
3683 c
->closes
|= (closetype
<< 2); /* seen this message */
3684 if (!(c
->closes
& closetype
)) {
3685 send_packet(ssh
, ssh
->pktin
.type
, PKT_INT
, c
->remoteid
,
3687 c
->closes
|= closetype
; /* sent it too */
3690 if (c
->closes
== 15) {
3691 del234(ssh
->channels
, c
);
3695 bombout(("Received CHANNEL_CLOSE%s for %s channel %d\n",
3696 ssh
->pktin
.type
== SSH1_MSG_CHANNEL_CLOSE ?
"" :
3697 "_CONFIRMATION", c ?
"half-open" : "nonexistent",
3701 } else if (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_DATA
) {
3702 /* Data sent down one of our channels. */
3703 int i
= GET_32BIT(ssh
->pktin
.body
);
3704 int len
= GET_32BIT(ssh
->pktin
.body
+ 4);
3705 unsigned char *p
= ssh
->pktin
.body
+ 8;
3706 struct ssh_channel
*c
;
3707 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
3712 bufsize
= x11_send(c
->u
.x11
.s
, (char *)p
, len
);
3715 bufsize
= pfd_send(c
->u
.pfd
.s
, (char *)p
, len
);
3718 /* Data for an agent message. Buffer it. */
3720 if (c
->u
.a
.lensofar
< 4) {
3721 int l
= min(4 - c
->u
.a
.lensofar
, len
);
3722 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
, p
,
3726 c
->u
.a
.lensofar
+= l
;
3728 if (c
->u
.a
.lensofar
== 4) {
3730 4 + GET_32BIT(c
->u
.a
.msglen
);
3731 c
->u
.a
.message
= snewn(c
->u
.a
.totallen
,
3733 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
3735 if (c
->u
.a
.lensofar
>= 4 && len
> 0) {
3737 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
3739 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
, p
,
3743 c
->u
.a
.lensofar
+= l
;
3745 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
3748 if (agent_query(c
->u
.a
.message
,
3751 ssh_agentf_callback
, c
))
3752 ssh_agentf_callback(c
, reply
, replylen
);
3753 sfree(c
->u
.a
.message
);
3754 c
->u
.a
.lensofar
= 0;
3757 bufsize
= 0; /* agent channels never back up */
3760 if (!c
->v
.v1
.throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
3761 c
->v
.v1
.throttling
= 1;
3762 ssh1_throttle(ssh
, +1);
3765 } else if (ssh
->pktin
.type
== SSH1_SMSG_SUCCESS
) {
3766 /* may be from EXEC_SHELL on some servers */
3767 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3768 /* may be from EXEC_SHELL on some servers
3769 * if no pty is available or in other odd cases. Ignore */
3770 } else if (ssh
->pktin
.type
== SSH1_SMSG_EXIT_STATUS
) {
3772 ssh
->exitcode
= GET_32BIT(ssh
->pktin
.body
);
3773 sprintf(buf
, "Server sent command exit status %d",
3776 send_packet(ssh
, SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
3778 * In case `helpful' firewalls or proxies tack
3779 * extra human-readable text on the end of the
3780 * session which we might mistake for another
3781 * encrypted packet, we close the session once
3782 * we've sent EXIT_CONFIRMATION.
3784 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
3787 bombout(("Strange packet received: type %d", ssh
->pktin
.type
));
3792 int len
= min(inlen
, 512);
3793 send_packet(ssh
, SSH1_CMSG_STDIN_DATA
,
3794 PKT_INT
, len
, PKT_DATA
, in
, len
, PKT_END
);
3805 * Utility routine for decoding comma-separated strings in KEXINIT.
3807 static int in_commasep_string(char *needle
, char *haystack
, int haylen
)
3810 if (!needle
|| !haystack
) /* protect against null pointers */
3812 needlen
= strlen(needle
);
3815 * Is it at the start of the string?
3817 if (haylen
>= needlen
&& /* haystack is long enough */
3818 !memcmp(needle
, haystack
, needlen
) && /* initial match */
3819 (haylen
== needlen
|| haystack
[needlen
] == ',')
3820 /* either , or EOS follows */
3824 * If not, search for the next comma and resume after that.
3825 * If no comma found, terminate.
3827 while (haylen
> 0 && *haystack
!= ',')
3828 haylen
--, haystack
++;
3831 haylen
--, haystack
++; /* skip over comma itself */
3836 * SSH2 key creation method.
3838 static void ssh2_mkkey(Ssh ssh
, Bignum K
, unsigned char *H
,
3839 unsigned char *sessid
, char chr
,
3840 unsigned char *keyspace
)
3843 /* First 20 bytes. */
3845 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
3847 SHA_Bytes(&s
, H
, 20);
3848 SHA_Bytes(&s
, &chr
, 1);
3849 SHA_Bytes(&s
, sessid
, 20);
3850 SHA_Final(&s
, keyspace
);
3851 /* Next 20 bytes. */
3853 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
3855 SHA_Bytes(&s
, H
, 20);
3856 SHA_Bytes(&s
, keyspace
, 20);
3857 SHA_Final(&s
, keyspace
+ 20);
3861 * Handle the SSH2 transport layer.
3863 static int do_ssh2_transport(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
3865 struct do_ssh2_transport_state
{
3866 int nbits
, pbits
, warn
;
3867 Bignum p
, g
, e
, f
, K
;
3868 int kex_init_value
, kex_reply_value
;
3869 const struct ssh_mac
**maclist
;
3871 const struct ssh2_cipher
*cscipher_tobe
;
3872 const struct ssh2_cipher
*sccipher_tobe
;
3873 const struct ssh_mac
*csmac_tobe
;
3874 const struct ssh_mac
*scmac_tobe
;
3875 const struct ssh_compress
*cscomp_tobe
;
3876 const struct ssh_compress
*sccomp_tobe
;
3877 char *hostkeydata
, *sigdata
, *keystr
, *fingerprint
;
3878 int hostkeylen
, siglen
;
3879 void *hkey
; /* actual host key */
3880 unsigned char exchange_hash
[20];
3881 int n_preferred_ciphers
;
3882 const struct ssh2_ciphers
*preferred_ciphers
[CIPHER_MAX
];
3883 const struct ssh_compress
*preferred_comp
;
3886 crState(do_ssh2_transport_state
);
3888 crBegin(ssh
->do_ssh2_transport_crstate
);
3890 s
->cscipher_tobe
= s
->sccipher_tobe
= NULL
;
3891 s
->csmac_tobe
= s
->scmac_tobe
= NULL
;
3892 s
->cscomp_tobe
= s
->sccomp_tobe
= NULL
;
3900 * Set up the preferred ciphers. (NULL => warn below here)
3902 s
->n_preferred_ciphers
= 0;
3903 for (i
= 0; i
< CIPHER_MAX
; i
++) {
3904 switch (ssh
->cfg
.ssh_cipherlist
[i
]) {
3905 case CIPHER_BLOWFISH
:
3906 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_blowfish
;
3909 if (ssh
->cfg
.ssh2_des_cbc
) {
3910 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_des
;
3914 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_3des
;
3917 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_aes
;
3920 /* Flag for later. Don't bother if it's the last in
3922 if (i
< CIPHER_MAX
- 1) {
3923 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = NULL
;
3931 * Set up preferred compression.
3933 if (ssh
->cfg
.compression
)
3934 s
->preferred_comp
= &ssh_zlib
;
3936 s
->preferred_comp
= &ssh_comp_none
;
3939 * Be prepared to work around the buggy MAC problem.
3941 if (ssh
->remote_bugs
& BUG_SSH2_HMAC
)
3942 s
->maclist
= buggymacs
, s
->nmacs
= lenof(buggymacs
);
3944 s
->maclist
= macs
, s
->nmacs
= lenof(macs
);
3948 int i
, j
, cipherstr_started
;
3951 * Construct and send our key exchange packet.
3953 ssh2_pkt_init(ssh
, SSH2_MSG_KEXINIT
);
3954 for (i
= 0; i
< 16; i
++)
3955 ssh2_pkt_addbyte(ssh
, (unsigned char) random_byte());
3956 /* List key exchange algorithms. */
3957 ssh2_pkt_addstring_start(ssh
);
3958 for (i
= 0; i
< lenof(kex_algs
); i
++) {
3959 if (kex_algs
[i
] == &ssh_diffiehellman_gex
&&
3960 (ssh
->remote_bugs
& BUG_SSH2_DH_GEX
))
3962 ssh2_pkt_addstring_str(ssh
, kex_algs
[i
]->name
);
3963 if (i
< lenof(kex_algs
) - 1)
3964 ssh2_pkt_addstring_str(ssh
, ",");
3966 /* List server host key algorithms. */
3967 ssh2_pkt_addstring_start(ssh
);
3968 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
3969 ssh2_pkt_addstring_str(ssh
, hostkey_algs
[i
]->name
);
3970 if (i
< lenof(hostkey_algs
) - 1)
3971 ssh2_pkt_addstring_str(ssh
, ",");
3973 /* List client->server encryption algorithms. */
3974 ssh2_pkt_addstring_start(ssh
);
3975 cipherstr_started
= 0;
3976 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
3977 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
3978 if (!c
) continue; /* warning flag */
3979 for (j
= 0; j
< c
->nciphers
; j
++) {
3980 if (cipherstr_started
)
3981 ssh2_pkt_addstring_str(ssh
, ",");
3982 ssh2_pkt_addstring_str(ssh
, c
->list
[j
]->name
);
3983 cipherstr_started
= 1;
3986 /* List server->client encryption algorithms. */
3987 ssh2_pkt_addstring_start(ssh
);
3988 cipherstr_started
= 0;
3989 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
3990 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
3991 if (!c
) continue; /* warning flag */
3992 for (j
= 0; j
< c
->nciphers
; j
++) {
3993 if (cipherstr_started
)
3994 ssh2_pkt_addstring_str(ssh
, ",");
3995 ssh2_pkt_addstring_str(ssh
, c
->list
[j
]->name
);
3996 cipherstr_started
= 1;
3999 /* List client->server MAC algorithms. */
4000 ssh2_pkt_addstring_start(ssh
);
4001 for (i
= 0; i
< s
->nmacs
; i
++) {
4002 ssh2_pkt_addstring_str(ssh
, s
->maclist
[i
]->name
);
4003 if (i
< s
->nmacs
- 1)
4004 ssh2_pkt_addstring_str(ssh
, ",");
4006 /* List server->client MAC algorithms. */
4007 ssh2_pkt_addstring_start(ssh
);
4008 for (i
= 0; i
< s
->nmacs
; i
++) {
4009 ssh2_pkt_addstring_str(ssh
, s
->maclist
[i
]->name
);
4010 if (i
< s
->nmacs
- 1)
4011 ssh2_pkt_addstring_str(ssh
, ",");
4013 /* List client->server compression algorithms. */
4014 ssh2_pkt_addstring_start(ssh
);
4015 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
4016 const struct ssh_compress
*c
=
4017 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
4018 ssh2_pkt_addstring_str(ssh
, c
->name
);
4019 if (i
< lenof(compressions
))
4020 ssh2_pkt_addstring_str(ssh
, ",");
4022 /* List server->client compression algorithms. */
4023 ssh2_pkt_addstring_start(ssh
);
4024 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
4025 const struct ssh_compress
*c
=
4026 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
4027 ssh2_pkt_addstring_str(ssh
, c
->name
);
4028 if (i
< lenof(compressions
))
4029 ssh2_pkt_addstring_str(ssh
, ",");
4031 /* List client->server languages. Empty list. */
4032 ssh2_pkt_addstring_start(ssh
);
4033 /* List server->client languages. Empty list. */
4034 ssh2_pkt_addstring_start(ssh
);
4035 /* First KEX packet does _not_ follow, because we're not that brave. */
4036 ssh2_pkt_addbool(ssh
, FALSE
);
4038 ssh2_pkt_adduint32(ssh
, 0);
4041 ssh
->exhash
= ssh
->exhashbase
;
4042 sha_string(&ssh
->exhash
, ssh
->pktout
.data
+ 5, ssh
->pktout
.length
- 5);
4048 if (ssh
->pktin
.length
> 5)
4049 sha_string(&ssh
->exhash
, ssh
->pktin
.data
+ 5, ssh
->pktin
.length
- 5);
4052 * Now examine the other side's KEXINIT to see what we're up
4059 if (ssh
->pktin
.type
!= SSH2_MSG_KEXINIT
) {
4060 bombout(("expected key exchange packet from server"));
4064 ssh
->hostkey
= NULL
;
4065 s
->cscipher_tobe
= NULL
;
4066 s
->sccipher_tobe
= NULL
;
4067 s
->csmac_tobe
= NULL
;
4068 s
->scmac_tobe
= NULL
;
4069 s
->cscomp_tobe
= NULL
;
4070 s
->sccomp_tobe
= NULL
;
4071 ssh
->pktin
.savedpos
+= 16; /* skip garbage cookie */
4072 ssh2_pkt_getstring(ssh
, &str
, &len
); /* key exchange algorithms */
4073 for (i
= 0; i
< lenof(kex_algs
); i
++) {
4074 if (kex_algs
[i
] == &ssh_diffiehellman_gex
&&
4075 (ssh
->remote_bugs
& BUG_SSH2_DH_GEX
))
4077 if (in_commasep_string(kex_algs
[i
]->name
, str
, len
)) {
4078 ssh
->kex
= kex_algs
[i
];
4082 ssh2_pkt_getstring(ssh
, &str
, &len
); /* host key algorithms */
4083 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
4084 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
4085 ssh
->hostkey
= hostkey_algs
[i
];
4089 ssh2_pkt_getstring(ssh
, &str
, &len
); /* client->server cipher */
4091 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4092 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4096 for (j
= 0; j
< c
->nciphers
; j
++) {
4097 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
4098 s
->cscipher_tobe
= c
->list
[j
];
4103 if (s
->cscipher_tobe
) {
4105 askcipher(ssh
->frontend
, s
->cscipher_tobe
->name
, 1);
4109 if (!s
->cscipher_tobe
) {
4110 bombout(("Couldn't agree a client-to-server cipher (available: %s)",
4111 str ? str
: "(null)"));
4115 ssh2_pkt_getstring(ssh
, &str
, &len
); /* server->client cipher */
4117 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4118 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4122 for (j
= 0; j
< c
->nciphers
; j
++) {
4123 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
4124 s
->sccipher_tobe
= c
->list
[j
];
4129 if (s
->sccipher_tobe
) {
4131 askcipher(ssh
->frontend
, s
->sccipher_tobe
->name
, 2);
4135 if (!s
->sccipher_tobe
) {
4136 bombout(("Couldn't agree a server-to-client cipher (available: %s)",
4137 str ? str
: "(null)"));
4141 ssh2_pkt_getstring(ssh
, &str
, &len
); /* client->server mac */
4142 for (i
= 0; i
< s
->nmacs
; i
++) {
4143 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
4144 s
->csmac_tobe
= s
->maclist
[i
];
4148 ssh2_pkt_getstring(ssh
, &str
, &len
); /* server->client mac */
4149 for (i
= 0; i
< s
->nmacs
; i
++) {
4150 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
4151 s
->scmac_tobe
= s
->maclist
[i
];
4155 ssh2_pkt_getstring(ssh
, &str
, &len
); /* client->server compression */
4156 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
4157 const struct ssh_compress
*c
=
4158 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
4159 if (in_commasep_string(c
->name
, str
, len
)) {
4164 ssh2_pkt_getstring(ssh
, &str
, &len
); /* server->client compression */
4165 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
4166 const struct ssh_compress
*c
=
4167 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
4168 if (in_commasep_string(c
->name
, str
, len
)) {
4176 * Work out the number of bits of key we will need from the key
4177 * exchange. We start with the maximum key length of either
4183 csbits
= s
->cscipher_tobe
->keylen
;
4184 scbits
= s
->sccipher_tobe
->keylen
;
4185 s
->nbits
= (csbits
> scbits ? csbits
: scbits
);
4187 /* The keys only have 160-bit entropy, since they're based on
4188 * a SHA-1 hash. So cap the key size at 160 bits. */
4193 * If we're doing Diffie-Hellman group exchange, start by
4194 * requesting a group.
4196 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
4197 logevent("Doing Diffie-Hellman group exchange");
4198 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGEX
;
4200 * Work out how big a DH group we will need to allow that
4203 s
->pbits
= 512 << ((s
->nbits
- 1) / 64);
4204 ssh2_pkt_init(ssh
, SSH2_MSG_KEX_DH_GEX_REQUEST
);
4205 ssh2_pkt_adduint32(ssh
, s
->pbits
);
4209 if (ssh
->pktin
.type
!= SSH2_MSG_KEX_DH_GEX_GROUP
) {
4210 bombout(("expected key exchange group packet from server"));
4213 s
->p
= ssh2_pkt_getmp(ssh
);
4214 s
->g
= ssh2_pkt_getmp(ssh
);
4215 ssh
->kex_ctx
= dh_setup_group(s
->p
, s
->g
);
4216 s
->kex_init_value
= SSH2_MSG_KEX_DH_GEX_INIT
;
4217 s
->kex_reply_value
= SSH2_MSG_KEX_DH_GEX_REPLY
;
4219 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGROUP1
;
4220 ssh
->kex_ctx
= dh_setup_group1();
4221 s
->kex_init_value
= SSH2_MSG_KEXDH_INIT
;
4222 s
->kex_reply_value
= SSH2_MSG_KEXDH_REPLY
;
4225 logevent("Doing Diffie-Hellman key exchange");
4227 * Now generate and send e for Diffie-Hellman.
4229 s
->e
= dh_create_e(ssh
->kex_ctx
, s
->nbits
* 2);
4230 ssh2_pkt_init(ssh
, s
->kex_init_value
);
4231 ssh2_pkt_addmp(ssh
, s
->e
);
4235 if (ssh
->pktin
.type
!= s
->kex_reply_value
) {
4236 bombout(("expected key exchange reply packet from server"));
4239 ssh2_pkt_getstring(ssh
, &s
->hostkeydata
, &s
->hostkeylen
);
4240 s
->f
= ssh2_pkt_getmp(ssh
);
4241 ssh2_pkt_getstring(ssh
, &s
->sigdata
, &s
->siglen
);
4243 s
->K
= dh_find_K(ssh
->kex_ctx
, s
->f
);
4245 sha_string(&ssh
->exhash
, s
->hostkeydata
, s
->hostkeylen
);
4246 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
4247 sha_uint32(&ssh
->exhash
, s
->pbits
);
4248 sha_mpint(&ssh
->exhash
, s
->p
);
4249 sha_mpint(&ssh
->exhash
, s
->g
);
4251 sha_mpint(&ssh
->exhash
, s
->e
);
4252 sha_mpint(&ssh
->exhash
, s
->f
);
4253 sha_mpint(&ssh
->exhash
, s
->K
);
4254 SHA_Final(&ssh
->exhash
, s
->exchange_hash
);
4256 dh_cleanup(ssh
->kex_ctx
);
4257 ssh
->kex_ctx
= NULL
;
4260 debug(("Exchange hash is:\n"));
4261 dmemdump(s
->exchange_hash
, 20);
4264 s
->hkey
= ssh
->hostkey
->newkey(s
->hostkeydata
, s
->hostkeylen
);
4266 !ssh
->hostkey
->verifysig(s
->hkey
, s
->sigdata
, s
->siglen
,
4267 (char *)s
->exchange_hash
, 20)) {
4268 bombout(("Server's host key did not match the signature supplied"));
4273 * Authenticate remote host: verify host key. (We've already
4274 * checked the signature of the exchange hash.)
4276 s
->keystr
= ssh
->hostkey
->fmtkey(s
->hkey
);
4277 s
->fingerprint
= ssh
->hostkey
->fingerprint(s
->hkey
);
4278 verify_ssh_host_key(ssh
->frontend
,
4279 ssh
->savedhost
, ssh
->savedport
, ssh
->hostkey
->keytype
,
4280 s
->keystr
, s
->fingerprint
);
4281 if (s
->first_kex
) { /* don't bother logging this in rekeys */
4282 logevent("Host key fingerprint is:");
4283 logevent(s
->fingerprint
);
4285 sfree(s
->fingerprint
);
4287 ssh
->hostkey
->freekey(s
->hkey
);
4290 * Send SSH2_MSG_NEWKEYS.
4292 ssh2_pkt_init(ssh
, SSH2_MSG_NEWKEYS
);
4296 * Expect SSH2_MSG_NEWKEYS from server.
4299 if (ssh
->pktin
.type
!= SSH2_MSG_NEWKEYS
) {
4300 bombout(("expected new-keys packet from server"));
4305 * Create and initialise session keys.
4307 if (ssh
->cs_cipher_ctx
)
4308 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
4309 ssh
->cscipher
= s
->cscipher_tobe
;
4310 ssh
->cs_cipher_ctx
= ssh
->cscipher
->make_context();
4312 if (ssh
->sc_cipher_ctx
)
4313 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
4314 ssh
->sccipher
= s
->sccipher_tobe
;
4315 ssh
->sc_cipher_ctx
= ssh
->sccipher
->make_context();
4317 if (ssh
->cs_mac_ctx
)
4318 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
4319 ssh
->csmac
= s
->csmac_tobe
;
4320 ssh
->cs_mac_ctx
= ssh
->csmac
->make_context();
4322 if (ssh
->sc_mac_ctx
)
4323 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
4324 ssh
->scmac
= s
->scmac_tobe
;
4325 ssh
->sc_mac_ctx
= ssh
->scmac
->make_context();
4327 if (ssh
->cs_comp_ctx
)
4328 ssh
->cscomp
->compress_cleanup(ssh
->cs_comp_ctx
);
4329 ssh
->cscomp
= s
->cscomp_tobe
;
4330 ssh
->cs_comp_ctx
= ssh
->cscomp
->compress_init();
4332 if (ssh
->sc_comp_ctx
)
4333 ssh
->sccomp
->decompress_cleanup(ssh
->sc_comp_ctx
);
4334 ssh
->sccomp
= s
->sccomp_tobe
;
4335 ssh
->sc_comp_ctx
= ssh
->sccomp
->decompress_init();
4338 * Set IVs after keys. Here we use the exchange hash from the
4339 * _first_ key exchange.
4342 unsigned char keyspace
[40];
4344 memcpy(ssh
->v2_session_id
, s
->exchange_hash
,
4345 sizeof(s
->exchange_hash
));
4346 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'C',keyspace
);
4347 ssh
->cscipher
->setkey(ssh
->cs_cipher_ctx
, keyspace
);
4348 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'D',keyspace
);
4349 ssh
->sccipher
->setkey(ssh
->sc_cipher_ctx
, keyspace
);
4350 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'A',keyspace
);
4351 ssh
->cscipher
->setiv(ssh
->cs_cipher_ctx
, keyspace
);
4352 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'B',keyspace
);
4353 ssh
->sccipher
->setiv(ssh
->sc_cipher_ctx
, keyspace
);
4354 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'E',keyspace
);
4355 ssh
->csmac
->setkey(ssh
->cs_mac_ctx
, keyspace
);
4356 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'F',keyspace
);
4357 ssh
->scmac
->setkey(ssh
->sc_mac_ctx
, keyspace
);
4359 logeventf(ssh
, "Initialised %.200s client->server encryption",
4360 ssh
->cscipher
->text_name
);
4361 logeventf(ssh
, "Initialised %.200s server->client encryption",
4362 ssh
->sccipher
->text_name
);
4363 if (ssh
->cscomp
->text_name
)
4364 logeventf(ssh
, "Initialised %s compression",
4365 ssh
->cscomp
->text_name
);
4366 if (ssh
->sccomp
->text_name
)
4367 logeventf(ssh
, "Initialised %s decompression",
4368 ssh
->sccomp
->text_name
);
4371 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
4377 * If this is the first key exchange phase, we must pass the
4378 * SSH2_MSG_NEWKEYS packet to the next layer, not because it
4379 * wants to see it but because it will need time to initialise
4380 * itself before it sees an actual packet. In subsequent key
4381 * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because
4382 * it would only confuse the layer above.
4384 if (!s
->first_kex
) {
4390 * Now we're encrypting. Begin returning 1 to the protocol main
4391 * function so that other things can run on top of the
4392 * transport. If we ever see a KEXINIT, we must go back to the
4395 while (!(ispkt
&& ssh
->pktin
.type
== SSH2_MSG_KEXINIT
)) {
4398 logevent("Server initiated key re-exchange");
4399 goto begin_key_exchange
;
4405 * Add data to an SSH2 channel output buffer.
4407 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
,
4410 bufchain_add(&c
->v
.v2
.outbuffer
, buf
, len
);
4414 * Attempt to send data on an SSH2 channel.
4416 static int ssh2_try_send(struct ssh_channel
*c
)
4420 while (c
->v
.v2
.remwindow
> 0 && bufchain_size(&c
->v
.v2
.outbuffer
) > 0) {
4423 bufchain_prefix(&c
->v
.v2
.outbuffer
, &data
, &len
);
4424 if ((unsigned)len
> c
->v
.v2
.remwindow
)
4425 len
= c
->v
.v2
.remwindow
;
4426 if ((unsigned)len
> c
->v
.v2
.remmaxpkt
)
4427 len
= c
->v
.v2
.remmaxpkt
;
4428 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_DATA
);
4429 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
4430 ssh2_pkt_addstring_start(ssh
);
4431 ssh2_pkt_addstring_data(ssh
, data
, len
);
4433 bufchain_consume(&c
->v
.v2
.outbuffer
, len
);
4434 c
->v
.v2
.remwindow
-= len
;
4438 * After having sent as much data as we can, return the amount
4441 return bufchain_size(&c
->v
.v2
.outbuffer
);
4445 * Potentially enlarge the window on an SSH2 channel.
4447 static void ssh2_set_window(struct ssh_channel
*c
, unsigned newwin
)
4452 * Never send WINDOW_ADJUST for a channel that the remote side
4453 * already thinks it's closed; there's no point, since it won't
4454 * be sending any more data anyway.
4459 if (newwin
> c
->v
.v2
.locwindow
) {
4460 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
4461 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
4462 ssh2_pkt_adduint32(ssh
, newwin
- c
->v
.v2
.locwindow
);
4464 c
->v
.v2
.locwindow
= newwin
;
4469 * Handle the SSH2 userauth and connection layers.
4471 static void do_ssh2_authconn(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
4473 struct do_ssh2_authconn_state
{
4475 AUTH_INVALID
, AUTH_PUBLICKEY_AGENT
, AUTH_PUBLICKEY_FILE
,
4477 AUTH_KEYBOARD_INTERACTIVE
4481 AUTH_TYPE_PUBLICKEY
,
4482 AUTH_TYPE_PUBLICKEY_OFFER_LOUD
,
4483 AUTH_TYPE_PUBLICKEY_OFFER_QUIET
,
4485 AUTH_TYPE_KEYBOARD_INTERACTIVE
,
4486 AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
4488 int gotit
, need_pw
, can_pubkey
, can_passwd
, can_keyb_inter
;
4489 int tried_pubkey_config
, tried_agent
, tried_keyb_inter
;
4490 int kbd_inter_running
;
4492 int num_prompts
, curr_prompt
, echo
;
4497 void *publickey_blob
;
4498 int publickey_bloblen
;
4499 unsigned char request
[5], *response
, *p
;
4503 char *pkblob
, *alg
, *commentp
;
4504 int pklen
, alglen
, commentlen
;
4505 int siglen
, retlen
, len
;
4506 char *q
, *agentreq
, *ret
;
4509 crState(do_ssh2_authconn_state
);
4511 crBegin(ssh
->do_ssh2_authconn_crstate
);
4514 * Request userauth protocol, and await a response to it.
4516 ssh2_pkt_init(ssh
, SSH2_MSG_SERVICE_REQUEST
);
4517 ssh2_pkt_addstring(ssh
, "ssh-userauth");
4519 crWaitUntilV(ispkt
);
4520 if (ssh
->pktin
.type
!= SSH2_MSG_SERVICE_ACCEPT
) {
4521 bombout(("Server refused user authentication protocol"));
4526 * We repeat this whole loop, including the username prompt,
4527 * until we manage a successful authentication. If the user
4528 * types the wrong _password_, they can be sent back to the
4529 * beginning to try another username, if this is configured on.
4530 * (If they specify a username in the config, they are never
4531 * asked, even if they do give a wrong password.)
4533 * I think this best serves the needs of
4535 * - the people who have no configuration, no keys, and just
4536 * want to try repeated (username,password) pairs until they
4537 * type both correctly
4539 * - people who have keys and configuration but occasionally
4540 * need to fall back to passwords
4542 * - people with a key held in Pageant, who might not have
4543 * logged in to a particular machine before; so they want to
4544 * type a username, and then _either_ their key will be
4545 * accepted, _or_ they will type a password. If they mistype
4546 * the username they will want to be able to get back and
4549 s
->username
[0] = '\0';
4550 s
->got_username
= FALSE
;
4555 if (s
->got_username
&& !ssh
->cfg
.change_username
) {
4557 * We got a username last time round this loop, and
4558 * with change_username turned off we don't try to get
4561 } else if ((flags
& FLAG_INTERACTIVE
) && !*ssh
->cfg
.username
) {
4562 if (ssh_get_line
&& !ssh_getline_pw_only
) {
4563 if (!ssh_get_line("login as: ",
4564 s
->username
, sizeof(s
->username
), FALSE
)) {
4566 * get_line failed to get a username.
4569 logevent("No username provided. Abandoning session.");
4570 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
4574 int ret
; /* need not be saved across crReturn */
4575 c_write_str(ssh
, "login as: ");
4577 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
4579 crWaitUntilV(!ispkt
);
4580 ret
= process_userpass_input(ssh
, in
, inlen
);
4584 c_write_str(ssh
, "\r\n");
4586 s
->username
[strcspn(s
->username
, "\n\r")] = '\0';
4589 strncpy(s
->username
, ssh
->cfg
.username
, sizeof(s
->username
));
4590 s
->username
[sizeof(s
->username
)-1] = '\0';
4591 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
4592 stuff
= dupprintf("Using username \"%s\".\r\n", s
->username
);
4593 c_write_str(ssh
, stuff
);
4597 s
->got_username
= TRUE
;
4600 * Send an authentication request using method "none": (a)
4601 * just in case it succeeds, and (b) so that we know what
4602 * authentication methods we can usefully try next.
4604 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4606 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4607 ssh2_pkt_addstring(ssh
, s
->username
);
4608 ssh2_pkt_addstring(ssh
, "ssh-connection");/* service requested */
4609 ssh2_pkt_addstring(ssh
, "none"); /* method */
4611 s
->type
= AUTH_TYPE_NONE
;
4613 s
->we_are_in
= FALSE
;
4615 s
->tried_pubkey_config
= FALSE
;
4616 s
->tried_agent
= FALSE
;
4617 s
->tried_keyb_inter
= FALSE
;
4618 s
->kbd_inter_running
= FALSE
;
4619 /* Load the pub half of ssh->cfg.keyfile so we notice if it's in Pageant */
4620 if (!filename_is_null(ssh
->cfg
.keyfile
)) {
4622 logeventf(ssh
, "Reading private key file \"%.150s\"",
4623 filename_to_str(&ssh
->cfg
.keyfile
));
4624 keytype
= key_type(&ssh
->cfg
.keyfile
);
4625 if (keytype
== SSH_KEYTYPE_SSH2
) {
4627 ssh2_userkey_loadpub(&ssh
->cfg
.keyfile
, NULL
,
4628 &s
->publickey_bloblen
, NULL
);
4631 logeventf(ssh
, "Unable to use this key file (%s)",
4632 key_type_to_str(keytype
));
4633 msgbuf
= dupprintf("Unable to use key file \"%.150s\""
4635 filename_to_str(&ssh
->cfg
.keyfile
),
4636 key_type_to_str(keytype
));
4637 c_write_str(ssh
, msgbuf
);
4639 s
->publickey_blob
= NULL
;
4642 s
->publickey_blob
= NULL
;
4646 * Wait for the result of the last authentication request.
4649 crWaitUntilV(ispkt
);
4650 while (ssh
->pktin
.type
== SSH2_MSG_USERAUTH_BANNER
) {
4654 * Don't show the banner if we're operating in
4655 * non-verbose non-interactive mode. (It's probably
4656 * a script, which means nobody will read the
4657 * banner _anyway_, and moreover the printing of
4658 * the banner will screw up processing on the
4659 * output of (say) plink.)
4661 if (flags
& (FLAG_VERBOSE
| FLAG_INTERACTIVE
)) {
4662 ssh2_pkt_getstring(ssh
, &banner
, &size
);
4664 c_write_untrusted(ssh
, banner
, size
);
4666 crWaitUntilV(ispkt
);
4668 if (ssh
->pktin
.type
== SSH2_MSG_USERAUTH_SUCCESS
) {
4669 logevent("Access granted");
4670 s
->we_are_in
= TRUE
;
4674 if (s
->kbd_inter_running
&&
4675 ssh
->pktin
.type
== SSH2_MSG_USERAUTH_INFO_REQUEST
) {
4677 * This is either a further set-of-prompts packet
4678 * in keyboard-interactive authentication, or it's
4679 * the same one and we came back here with `gotit'
4680 * set. In the former case, we must reset the
4681 * curr_prompt variable.
4685 } else if (ssh
->pktin
.type
!= SSH2_MSG_USERAUTH_FAILURE
) {
4686 bombout(("Strange packet received during authentication: type %d",
4694 * OK, we're now sitting on a USERAUTH_FAILURE message, so
4695 * we can look at the string in it and know what we can
4696 * helpfully try next.
4698 if (ssh
->pktin
.type
== SSH2_MSG_USERAUTH_FAILURE
) {
4701 ssh2_pkt_getstring(ssh
, &methods
, &methlen
);
4702 s
->kbd_inter_running
= FALSE
;
4703 if (!ssh2_pkt_getbool(ssh
)) {
4705 * We have received an unequivocal Access
4706 * Denied. This can translate to a variety of
4709 * - if we'd just tried "none" authentication,
4710 * it's not worth printing anything at all
4712 * - if we'd just tried a public key _offer_,
4713 * the message should be "Server refused our
4714 * key" (or no message at all if the key
4715 * came from Pageant)
4717 * - if we'd just tried anything else, the
4718 * message really should be "Access denied".
4720 * Additionally, if we'd just tried password
4721 * authentication, we should break out of this
4722 * whole loop so as to go back to the username
4725 if (s
->type
== AUTH_TYPE_NONE
) {
4727 } else if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
||
4728 s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_QUIET
) {
4729 if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
)
4730 c_write_str(ssh
, "Server refused our key\r\n");
4731 logevent("Server refused public key");
4732 } else if (s
->type
==AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
) {
4733 /* server declined keyboard-interactive; ignore */
4735 c_write_str(ssh
, "Access denied\r\n");
4736 logevent("Access denied");
4737 if (s
->type
== AUTH_TYPE_PASSWORD
) {
4738 s
->we_are_in
= FALSE
;
4743 c_write_str(ssh
, "Further authentication required\r\n");
4744 logevent("Further authentication required");
4748 in_commasep_string("publickey", methods
, methlen
);
4750 in_commasep_string("password", methods
, methlen
);
4751 s
->can_keyb_inter
= ssh
->cfg
.try_ki_auth
&&
4752 in_commasep_string("keyboard-interactive", methods
, methlen
);
4756 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4760 * Most password/passphrase prompts will be
4761 * non-echoing, so we set this to 0 by default.
4762 * Exception is that some keyboard-interactive prompts
4763 * can be echoing, in which case we'll set this to 1.
4767 if (!s
->method
&& s
->can_pubkey
&&
4768 agent_exists() && !s
->tried_agent
) {
4770 * Attempt public-key authentication using Pageant.
4775 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4776 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
4778 s
->tried_agent
= TRUE
;
4780 logevent("Pageant is running. Requesting keys.");
4782 /* Request the keys held by the agent. */
4783 PUT_32BIT(s
->request
, 1);
4784 s
->request
[4] = SSH2_AGENTC_REQUEST_IDENTITIES
;
4785 if (!agent_query(s
->request
, 5, &r
, &s
->responselen
,
4786 ssh_agent_callback
, ssh
)) {
4790 bombout(("Unexpected data from server while"
4791 " waiting for agent response"));
4794 } while (ispkt
|| inlen
> 0);
4795 r
= ssh
->agent_response
;
4796 s
->responselen
= ssh
->agent_response_len
;
4798 s
->response
= (unsigned char *) r
;
4799 if (s
->response
&& s
->responselen
>= 5 &&
4800 s
->response
[4] == SSH2_AGENT_IDENTITIES_ANSWER
) {
4801 s
->p
= s
->response
+ 5;
4802 s
->nkeys
= GET_32BIT(s
->p
);
4806 sprintf(buf
, "Pageant has %d SSH2 keys", s
->nkeys
);
4809 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
4814 sprintf(buf
, "Trying Pageant key #%d", s
->keyi
);
4817 s
->pklen
= GET_32BIT(s
->p
);
4819 if (s
->publickey_blob
&&
4820 s
->pklen
== s
->publickey_bloblen
&&
4821 !memcmp(s
->p
, s
->publickey_blob
,
4822 s
->publickey_bloblen
)) {
4823 logevent("This key matches configured key file");
4824 s
->tried_pubkey_config
= 1;
4826 s
->pkblob
= (char *)s
->p
;
4828 s
->alglen
= GET_32BIT(s
->pkblob
);
4829 s
->alg
= s
->pkblob
+ 4;
4830 s
->commentlen
= GET_32BIT(s
->p
);
4832 s
->commentp
= (char *)s
->p
;
4833 s
->p
+= s
->commentlen
;
4834 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4835 ssh2_pkt_addstring(ssh
, s
->username
);
4836 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4837 ssh2_pkt_addstring(ssh
, "publickey"); /* method */
4838 ssh2_pkt_addbool(ssh
, FALSE
); /* no signature included */
4839 ssh2_pkt_addstring_start(ssh
);
4840 ssh2_pkt_addstring_data(ssh
, s
->alg
, s
->alglen
);
4841 ssh2_pkt_addstring_start(ssh
);
4842 ssh2_pkt_addstring_data(ssh
, s
->pkblob
, s
->pklen
);
4845 crWaitUntilV(ispkt
);
4846 if (ssh
->pktin
.type
!= SSH2_MSG_USERAUTH_PK_OK
) {
4847 logevent("Key refused");
4851 if (flags
& FLAG_VERBOSE
) {
4852 c_write_str(ssh
, "Authenticating with "
4854 c_write(ssh
, s
->commentp
, s
->commentlen
);
4855 c_write_str(ssh
, "\" from agent\r\n");
4859 * Server is willing to accept the key.
4860 * Construct a SIGN_REQUEST.
4862 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4863 ssh2_pkt_addstring(ssh
, s
->username
);
4864 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4865 ssh2_pkt_addstring(ssh
, "publickey"); /* method */
4866 ssh2_pkt_addbool(ssh
, TRUE
);
4867 ssh2_pkt_addstring_start(ssh
);
4868 ssh2_pkt_addstring_data(ssh
, s
->alg
, s
->alglen
);
4869 ssh2_pkt_addstring_start(ssh
);
4870 ssh2_pkt_addstring_data(ssh
, s
->pkblob
, s
->pklen
);
4872 s
->siglen
= ssh
->pktout
.length
- 5 + 4 + 20;
4873 if (ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)
4875 s
->len
= 1; /* message type */
4876 s
->len
+= 4 + s
->pklen
; /* key blob */
4877 s
->len
+= 4 + s
->siglen
; /* data to sign */
4878 s
->len
+= 4; /* flags */
4879 s
->agentreq
= snewn(4 + s
->len
, char);
4880 PUT_32BIT(s
->agentreq
, s
->len
);
4881 s
->q
= s
->agentreq
+ 4;
4882 *s
->q
++ = SSH2_AGENTC_SIGN_REQUEST
;
4883 PUT_32BIT(s
->q
, s
->pklen
);
4885 memcpy(s
->q
, s
->pkblob
, s
->pklen
);
4887 PUT_32BIT(s
->q
, s
->siglen
);
4889 /* Now the data to be signed... */
4890 if (!(ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)) {
4891 PUT_32BIT(s
->q
, 20);
4894 memcpy(s
->q
, ssh
->v2_session_id
, 20);
4896 memcpy(s
->q
, ssh
->pktout
.data
+ 5,
4897 ssh
->pktout
.length
- 5);
4898 s
->q
+= ssh
->pktout
.length
- 5;
4899 /* And finally the (zero) flags word. */
4901 if (!agent_query(s
->agentreq
, s
->len
+ 4,
4903 ssh_agent_callback
, ssh
)) {
4907 bombout(("Unexpected data from server"
4908 " while waiting for agent"
4912 } while (ispkt
|| inlen
> 0);
4913 vret
= ssh
->agent_response
;
4914 s
->retlen
= ssh
->agent_response_len
;
4919 if (s
->ret
[4] == SSH2_AGENT_SIGN_RESPONSE
) {
4920 logevent("Sending Pageant's response");
4921 ssh2_add_sigblob(ssh
, s
->pkblob
, s
->pklen
,
4923 GET_32BIT(s
->ret
+ 5));
4929 ("Pageant failed to answer challenge");
4940 if (!s
->method
&& s
->can_pubkey
&& s
->publickey_blob
4941 && !s
->tried_pubkey_config
) {
4942 unsigned char *pub_blob
;
4943 char *algorithm
, *comment
;
4946 s
->tried_pubkey_config
= TRUE
;
4948 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4949 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
4952 * Try the public key supplied in the configuration.
4954 * First, offer the public blob to see if the server is
4955 * willing to accept it.
4958 (unsigned char *)ssh2_userkey_loadpub(&ssh
->cfg
.keyfile
,
4963 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4964 ssh2_pkt_addstring(ssh
, s
->username
);
4965 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4966 ssh2_pkt_addstring(ssh
, "publickey"); /* method */
4967 ssh2_pkt_addbool(ssh
, FALSE
); /* no signature included */
4968 ssh2_pkt_addstring(ssh
, algorithm
);
4969 ssh2_pkt_addstring_start(ssh
);
4970 ssh2_pkt_addstring_data(ssh
, (char *)pub_blob
,
4973 logevent("Offered public key"); /* FIXME */
4975 crWaitUntilV(ispkt
);
4976 if (ssh
->pktin
.type
!= SSH2_MSG_USERAUTH_PK_OK
) {
4978 s
->type
= AUTH_TYPE_PUBLICKEY_OFFER_LOUD
;
4979 continue; /* key refused; give up on it */
4982 logevent("Offer of public key accepted");
4984 * Actually attempt a serious authentication using
4987 if (ssh2_userkey_encrypted(&ssh
->cfg
.keyfile
, &comment
)) {
4988 sprintf(s
->pwprompt
,
4989 "Passphrase for key \"%.100s\": ",
4995 c_write_str(ssh
, "Authenticating with public key \"");
4996 c_write_str(ssh
, comment
);
4997 c_write_str(ssh
, "\"\r\n");
4998 s
->method
= AUTH_PUBLICKEY_FILE
;
5002 if (!s
->method
&& s
->can_keyb_inter
&& !s
->tried_keyb_inter
) {
5003 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
5004 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
5005 s
->tried_keyb_inter
= TRUE
;
5007 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
5008 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
5010 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
5011 ssh2_pkt_addstring(ssh
, s
->username
);
5012 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
5013 ssh2_pkt_addstring(ssh
, "keyboard-interactive"); /* method */
5014 ssh2_pkt_addstring(ssh
, ""); /* lang */
5015 ssh2_pkt_addstring(ssh
, "");
5018 crWaitUntilV(ispkt
);
5019 if (ssh
->pktin
.type
!= SSH2_MSG_USERAUTH_INFO_REQUEST
) {
5020 if (ssh
->pktin
.type
== SSH2_MSG_USERAUTH_FAILURE
)
5022 logevent("Keyboard-interactive authentication refused");
5023 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
;
5027 s
->kbd_inter_running
= TRUE
;
5031 if (s
->kbd_inter_running
) {
5032 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
5033 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
5034 s
->tried_keyb_inter
= TRUE
;
5036 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
5037 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
5039 if (s
->curr_prompt
== 0) {
5041 * We've got a fresh USERAUTH_INFO_REQUEST.
5042 * Display header data, and start going through
5045 char *name
, *inst
, *lang
;
5046 int name_len
, inst_len
, lang_len
;
5048 ssh2_pkt_getstring(ssh
, &name
, &name_len
);
5049 ssh2_pkt_getstring(ssh
, &inst
, &inst_len
);
5050 ssh2_pkt_getstring(ssh
, &lang
, &lang_len
);
5052 c_write_untrusted(ssh
, name
, name_len
);
5053 c_write_str(ssh
, "\r\n");
5056 c_write_untrusted(ssh
, inst
, inst_len
);
5057 c_write_str(ssh
, "\r\n");
5059 s
->num_prompts
= ssh2_pkt_getuint32(ssh
);
5063 * If there are prompts remaining in the packet,
5064 * display one and get a response.
5066 if (s
->curr_prompt
< s
->num_prompts
) {
5070 ssh2_pkt_getstring(ssh
, &prompt
, &prompt_len
);
5071 if (prompt_len
> 0) {
5072 strncpy(s
->pwprompt
, prompt
, sizeof(s
->pwprompt
));
5073 s
->pwprompt
[prompt_len
< sizeof(s
->pwprompt
) ?
5074 prompt_len
: sizeof(s
->pwprompt
)-1] = '\0';
5077 "<server failed to send prompt>: ");
5079 s
->echo
= ssh2_pkt_getbool(ssh
);
5085 if (!s
->method
&& s
->can_passwd
) {
5086 s
->method
= AUTH_PASSWORD
;
5087 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
5088 ssh
->pkt_ctx
|= SSH2_PKTCTX_PASSWORD
;
5089 sprintf(s
->pwprompt
, "%.90s@%.90s's password: ", s
->username
,
5096 if (!ssh_get_line(s
->pwprompt
, s
->password
,
5097 sizeof(s
->password
), TRUE
)) {
5099 * get_line failed to get a password (for
5100 * example because one was supplied on the
5101 * command line which has already failed to
5104 ssh2_pkt_init(ssh
, SSH2_MSG_DISCONNECT
);
5105 ssh2_pkt_adduint32(ssh
,SSH2_DISCONNECT_BY_APPLICATION
);
5106 ssh2_pkt_addstring(ssh
, "No more passwords available"
5108 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
5110 logevent("Unable to authenticate");
5111 connection_fatal(ssh
->frontend
,
5112 "Unable to authenticate");
5113 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5117 int ret
; /* need not be saved across crReturn */
5118 c_write_untrusted(ssh
, s
->pwprompt
, strlen(s
->pwprompt
));
5121 setup_userpass_input(ssh
, s
->password
,
5122 sizeof(s
->password
), s
->echo
);
5124 crWaitUntilV(!ispkt
);
5125 ret
= process_userpass_input(ssh
, in
, inlen
);
5129 c_write_str(ssh
, "\r\n");
5133 if (s
->method
== AUTH_PUBLICKEY_FILE
) {
5135 * We have our passphrase. Now try the actual authentication.
5137 struct ssh2_userkey
*key
;
5138 const char *error
= NULL
;
5140 key
= ssh2_load_userkey(&ssh
->cfg
.keyfile
, s
->password
,
5142 if (key
== SSH2_WRONG_PASSPHRASE
|| key
== NULL
) {
5143 if (key
== SSH2_WRONG_PASSPHRASE
) {
5144 c_write_str(ssh
, "Wrong passphrase\r\n");
5145 s
->tried_pubkey_config
= FALSE
;
5147 c_write_str(ssh
, "Unable to load private key (");
5148 c_write_str(ssh
, error
);
5149 c_write_str(ssh
, ")\r\n");
5150 s
->tried_pubkey_config
= TRUE
;
5152 /* Send a spurious AUTH_NONE to return to the top. */
5153 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
5154 ssh2_pkt_addstring(ssh
, s
->username
);
5155 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
5156 ssh2_pkt_addstring(ssh
, "none"); /* method */
5158 s
->type
= AUTH_TYPE_NONE
;
5160 unsigned char *pkblob
, *sigblob
, *sigdata
;
5161 int pkblob_len
, sigblob_len
, sigdata_len
;
5165 * We have loaded the private key and the server
5166 * has announced that it's willing to accept it.
5167 * Hallelujah. Generate a signature and send it.
5169 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
5170 ssh2_pkt_addstring(ssh
, s
->username
);
5171 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
5172 ssh2_pkt_addstring(ssh
, "publickey"); /* method */
5173 ssh2_pkt_addbool(ssh
, TRUE
);
5174 ssh2_pkt_addstring(ssh
, key
->alg
->name
);
5175 pkblob
= key
->alg
->public_blob(key
->data
, &pkblob_len
);
5176 ssh2_pkt_addstring_start(ssh
);
5177 ssh2_pkt_addstring_data(ssh
, (char *)pkblob
, pkblob_len
);
5180 * The data to be signed is:
5184 * followed by everything so far placed in the
5187 sigdata_len
= ssh
->pktout
.length
- 5 + 4 + 20;
5188 if (ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)
5190 sigdata
= snewn(sigdata_len
, unsigned char);
5192 if (!(ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)) {
5193 PUT_32BIT(sigdata
+p
, 20);
5196 memcpy(sigdata
+p
, ssh
->v2_session_id
, 20); p
+= 20;
5197 memcpy(sigdata
+p
, ssh
->pktout
.data
+ 5,
5198 ssh
->pktout
.length
- 5);
5199 p
+= ssh
->pktout
.length
- 5;
5200 assert(p
== sigdata_len
);
5201 sigblob
= key
->alg
->sign(key
->data
, (char *)sigdata
,
5202 sigdata_len
, &sigblob_len
);
5203 ssh2_add_sigblob(ssh
, pkblob
, pkblob_len
,
5204 sigblob
, sigblob_len
);
5210 s
->type
= AUTH_TYPE_PUBLICKEY
;
5211 key
->alg
->freekey(key
->data
);
5213 } else if (s
->method
== AUTH_PASSWORD
) {
5215 * We send the password packet lumped tightly together with
5216 * an SSH_MSG_IGNORE packet. The IGNORE packet contains a
5217 * string long enough to make the total length of the two
5218 * packets constant. This should ensure that a passive
5219 * listener doing traffic analyis can't work out the length
5222 * For this to work, we need an assumption about the
5223 * maximum length of the password packet. I think 256 is
5224 * pretty conservative. Anyone using a password longer than
5225 * that probably doesn't have much to worry about from
5226 * people who find out how long their password is!
5228 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
5229 ssh2_pkt_addstring(ssh
, s
->username
);
5230 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
5231 ssh2_pkt_addstring(ssh
, "password");
5232 ssh2_pkt_addbool(ssh
, FALSE
);
5233 ssh2_pkt_addstring(ssh
, s
->password
);
5234 memset(s
->password
, 0, sizeof(s
->password
));
5235 ssh2_pkt_defer(ssh
);
5237 * We'll include a string that's an exact multiple of the
5238 * cipher block size. If the cipher is NULL for some
5239 * reason, we don't do this trick at all because we gain
5242 if (ssh
->cscipher
) {
5245 stringlen
= (256 - ssh
->deferred_len
);
5246 stringlen
+= ssh
->cscipher
->blksize
- 1;
5247 stringlen
-= (stringlen
% ssh
->cscipher
->blksize
);
5250 * Temporarily disable actual compression,
5251 * so we can guarantee to get this string
5252 * exactly the length we want it. The
5253 * compression-disabling routine should
5254 * return an integer indicating how many
5255 * bytes we should adjust our string length
5259 ssh
->cscomp
->disable_compression(ssh
->cs_comp_ctx
);
5261 ssh2_pkt_init(ssh
, SSH2_MSG_IGNORE
);
5262 ssh2_pkt_addstring_start(ssh
);
5263 for (i
= 0; i
< stringlen
; i
++) {
5264 char c
= (char) random_byte();
5265 ssh2_pkt_addstring_data(ssh
, &c
, 1);
5267 ssh2_pkt_defer(ssh
);
5269 ssh_pkt_defersend(ssh
);
5270 logevent("Sent password");
5271 s
->type
= AUTH_TYPE_PASSWORD
;
5272 } else if (s
->method
== AUTH_KEYBOARD_INTERACTIVE
) {
5273 if (s
->curr_prompt
== 0) {
5274 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_INFO_RESPONSE
);
5275 ssh2_pkt_adduint32(ssh
, s
->num_prompts
);
5277 if (s
->need_pw
) { /* only add pw if we just got one! */
5278 ssh2_pkt_addstring(ssh
, s
->password
);
5279 memset(s
->password
, 0, sizeof(s
->password
));
5282 if (s
->curr_prompt
>= s
->num_prompts
) {
5286 * If there are prompts remaining, we set
5287 * `gotit' so that we won't attempt to get
5288 * another packet. Then we go back round the
5289 * loop and will end up retrieving another
5290 * prompt out of the existing packet. Funky or
5295 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
5297 c_write_str(ssh
, "No supported authentication methods"
5298 " left to try!\r\n");
5299 logevent("No supported authentications offered."
5301 ssh2_pkt_init(ssh
, SSH2_MSG_DISCONNECT
);
5302 ssh2_pkt_adduint32(ssh
, SSH2_DISCONNECT_BY_APPLICATION
);
5303 ssh2_pkt_addstring(ssh
, "No supported authentication"
5304 " methods available");
5305 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
5307 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5311 } while (!s
->we_are_in
);
5314 * Now we're authenticated for the connection protocol. The
5315 * connection protocol will automatically have started at this
5316 * point; there's no need to send SERVICE_REQUEST.
5320 * So now create a channel with a session in it.
5322 ssh
->channels
= newtree234(ssh_channelcmp
);
5323 ssh
->mainchan
= snew(struct ssh_channel
);
5324 ssh
->mainchan
->ssh
= ssh
;
5325 ssh
->mainchan
->localid
= alloc_channel_id(ssh
);
5326 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_OPEN
);
5327 ssh2_pkt_addstring(ssh
, "session");
5328 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->localid
);
5329 ssh
->mainchan
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
5330 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->v
.v2
.locwindow
);/* our window size */
5331 ssh2_pkt_adduint32(ssh
, 0x4000UL
); /* our max pkt size */
5333 crWaitUntilV(ispkt
);
5334 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
5335 bombout(("Server refused to open a session"));
5337 /* FIXME: error data comes back in FAILURE packet */
5339 if (ssh2_pkt_getuint32(ssh
) != ssh
->mainchan
->localid
) {
5340 bombout(("Server's channel confirmation cited wrong channel"));
5343 ssh
->mainchan
->remoteid
= ssh2_pkt_getuint32(ssh
);
5344 ssh
->mainchan
->type
= CHAN_MAINSESSION
;
5345 ssh
->mainchan
->closes
= 0;
5346 ssh
->mainchan
->v
.v2
.remwindow
= ssh2_pkt_getuint32(ssh
);
5347 ssh
->mainchan
->v
.v2
.remmaxpkt
= ssh2_pkt_getuint32(ssh
);
5348 bufchain_init(&ssh
->mainchan
->v
.v2
.outbuffer
);
5349 add234(ssh
->channels
, ssh
->mainchan
);
5350 logevent("Opened channel for session");
5353 * Potentially enable X11 forwarding.
5355 if (ssh
->cfg
.x11_forward
) {
5356 char proto
[20], data
[64];
5357 logevent("Requesting X11 forwarding");
5358 ssh
->x11auth
= x11_invent_auth(proto
, sizeof(proto
),
5359 data
, sizeof(data
), ssh
->cfg
.x11_auth
);
5360 x11_get_real_auth(ssh
->x11auth
, ssh
->cfg
.x11_display
);
5361 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5362 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
5363 ssh2_pkt_addstring(ssh
, "x11-req");
5364 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5365 ssh2_pkt_addbool(ssh
, 0); /* many connections */
5366 ssh2_pkt_addstring(ssh
, proto
);
5367 ssh2_pkt_addstring(ssh
, data
);
5368 ssh2_pkt_adduint32(ssh
, x11_get_screen_number(ssh
->cfg
.x11_display
));
5372 crWaitUntilV(ispkt
);
5373 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5374 unsigned i
= ssh2_pkt_getuint32(ssh
);
5375 struct ssh_channel
*c
;
5376 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5378 continue; /* nonexistent channel */
5379 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5381 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5383 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
5384 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
5385 bombout(("Unexpected response to X11 forwarding request:"
5386 " packet type %d", ssh
->pktin
.type
));
5389 logevent("X11 forwarding refused");
5391 logevent("X11 forwarding enabled");
5392 ssh
->X11_fwd_enabled
= TRUE
;
5397 * Enable port forwardings.
5402 int sport
,dport
,sserv
,dserv
;
5403 char sports
[256], dports
[256], saddr
[256], host
[256];
5405 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh2
);
5406 /* Add port forwardings. */
5407 ssh
->portfwd_strptr
= ssh
->cfg
.portfwd
;
5408 while (*ssh
->portfwd_strptr
) {
5409 type
= *ssh
->portfwd_strptr
++;
5412 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= '\t') {
5413 if (*ssh
->portfwd_strptr
== ':') {
5415 * We've seen a colon in the middle of the
5416 * source port number. This means that
5417 * everything we've seen until now is the
5418 * source _address_, so we'll move it into
5419 * saddr and start sports from the beginning
5422 ssh
->portfwd_strptr
++;
5424 strcpy(saddr
, sports
);
5427 if (n
< 255) sports
[n
++] = *ssh
->portfwd_strptr
++;
5431 if (*ssh
->portfwd_strptr
== '\t')
5432 ssh
->portfwd_strptr
++;
5434 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= ':') {
5435 if (n
< 255) host
[n
++] = *ssh
->portfwd_strptr
++;
5438 if (*ssh
->portfwd_strptr
== ':')
5439 ssh
->portfwd_strptr
++;
5441 while (*ssh
->portfwd_strptr
) {
5442 if (n
< 255) dports
[n
++] = *ssh
->portfwd_strptr
++;
5445 ssh
->portfwd_strptr
++;
5446 dport
= atoi(dports
);
5450 dport
= net_service_lookup(dports
);
5452 logeventf(ssh
, "Service lookup failed for destination"
5453 " port \"%s\"", dports
);
5457 while (*ssh
->portfwd_strptr
) ssh
->portfwd_strptr
++;
5459 ssh
->portfwd_strptr
++; /* eat the NUL and move to next one */
5461 sport
= atoi(sports
);
5465 sport
= net_service_lookup(sports
);
5467 logeventf(ssh
, "Service lookup failed for source"
5468 " port \"%s\"", sports
);
5471 if (sport
&& dport
) {
5473 pfd_addforward(host
, dport
, *saddr ? saddr
: NULL
,
5474 sport
, ssh
, &ssh
->cfg
);
5475 logeventf(ssh
, "Local port %.*s%.*s%.*s%.*s%d%.*s"
5476 " forwarding to %s:%.*s%.*s%d%.*s",
5477 (int)(*saddr?
strlen(saddr
):0), *saddr?saddr
:NULL
,
5478 (int)(*saddr?
1:0), ":",
5479 (int)(sserv ?
strlen(sports
) : 0), sports
,
5480 sserv
, "(", sport
, sserv
, ")",
5482 (int)(dserv ?
strlen(dports
) : 0), dports
,
5483 dserv
, "(", dport
, dserv
, ")");
5484 } else if (type
== 'D') {
5485 pfd_addforward(NULL
, -1, *saddr ? saddr
: NULL
,
5486 sport
, ssh
, &ssh
->cfg
);
5487 logeventf(ssh
, "Local port %.*s%.*s%.*s%.*s%d%.*s"
5488 " doing SOCKS dynamic forwarding",
5489 (int)(*saddr?
strlen(saddr
):0), *saddr?saddr
:NULL
,
5490 (int)(*saddr?
1:0), ":",
5491 (int)(sserv ?
strlen(sports
) : 0), sports
,
5492 sserv
, "(", sport
, sserv
, ")");
5494 struct ssh_rportfwd
*pf
;
5495 pf
= snew(struct ssh_rportfwd
);
5496 strcpy(pf
->dhost
, host
);
5499 if (add234(ssh
->rportfwds
, pf
) != pf
) {
5500 logeventf(ssh
, "Duplicate remote port forwarding"
5501 " to %s:%d", host
, dport
);
5504 logeventf(ssh
, "Requesting remote port "
5505 "%.*s%.*s%.*s%.*s%d%.*s"
5506 " forward to %s:%.*s%.*s%d%.*s",
5507 (int)(*saddr?
strlen(saddr
):0),
5509 (int)(*saddr?
1:0), ":",
5510 (int)(sserv ?
strlen(sports
) : 0), sports
,
5511 sserv
, "(", sport
, sserv
, ")",
5513 (int)(dserv ?
strlen(dports
) : 0), dports
,
5514 dserv
, "(", dport
, dserv
, ")");
5515 ssh2_pkt_init(ssh
, SSH2_MSG_GLOBAL_REQUEST
);
5516 ssh2_pkt_addstring(ssh
, "tcpip-forward");
5517 ssh2_pkt_addbool(ssh
, 1);/* want reply */
5519 ssh2_pkt_addstring(ssh
, saddr
);
5520 if (ssh
->cfg
.rport_acceptall
)
5521 ssh2_pkt_addstring(ssh
, "0.0.0.0");
5523 ssh2_pkt_addstring(ssh
, "127.0.0.1");
5524 ssh2_pkt_adduint32(ssh
, sport
);
5528 crWaitUntilV(ispkt
);
5529 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5530 unsigned i
= ssh2_pkt_getuint32(ssh
);
5531 struct ssh_channel
*c
;
5532 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5534 continue;/* nonexistent channel */
5535 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5537 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5539 if (ssh
->pktin
.type
!= SSH2_MSG_REQUEST_SUCCESS
) {
5540 if (ssh
->pktin
.type
!= SSH2_MSG_REQUEST_FAILURE
) {
5541 bombout(("Unexpected response to port "
5542 "forwarding request: packet type %d",
5546 logevent("Server refused this port forwarding");
5548 logevent("Remote port forwarding enabled");
5557 * Potentially enable agent forwarding.
5559 if (ssh
->cfg
.agentfwd
&& agent_exists()) {
5560 logevent("Requesting OpenSSH-style agent forwarding");
5561 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5562 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
5563 ssh2_pkt_addstring(ssh
, "auth-agent-req@openssh.com");
5564 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5568 crWaitUntilV(ispkt
);
5569 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5570 unsigned i
= ssh2_pkt_getuint32(ssh
);
5571 struct ssh_channel
*c
;
5572 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5574 continue; /* nonexistent channel */
5575 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5577 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5579 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
5580 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
5581 bombout(("Unexpected response to agent forwarding request:"
5582 " packet type %d", ssh
->pktin
.type
));
5585 logevent("Agent forwarding refused");
5587 logevent("Agent forwarding enabled");
5588 ssh
->agentfwd_enabled
= TRUE
;
5593 * Now allocate a pty for the session.
5595 if (!ssh
->cfg
.nopty
) {
5596 /* Unpick the terminal-speed string. */
5597 /* XXX perhaps we should allow no speeds to be sent. */
5598 ssh
->ospeed
= 38400; ssh
->ispeed
= 38400; /* last-resort defaults */
5599 sscanf(ssh
->cfg
.termspeed
, "%d,%d", &ssh
->ospeed
, &ssh
->ispeed
);
5600 /* Build the pty request. */
5601 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5602 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
); /* recipient channel */
5603 ssh2_pkt_addstring(ssh
, "pty-req");
5604 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5605 ssh2_pkt_addstring(ssh
, ssh
->cfg
.termtype
);
5606 ssh2_pkt_adduint32(ssh
, ssh
->term_width
);
5607 ssh2_pkt_adduint32(ssh
, ssh
->term_height
);
5608 ssh2_pkt_adduint32(ssh
, 0); /* pixel width */
5609 ssh2_pkt_adduint32(ssh
, 0); /* pixel height */
5610 ssh2_pkt_addstring_start(ssh
);
5611 ssh2_pkt_addbyte(ssh
, 128); /* TTY_OP_ISPEED */
5612 ssh2_pkt_adduint32(ssh
, ssh
->ispeed
);
5613 ssh2_pkt_addbyte(ssh
, 129); /* TTY_OP_OSPEED */
5614 ssh2_pkt_adduint32(ssh
, ssh
->ospeed
);
5615 ssh2_pkt_addstring_data(ssh
, "\0", 1); /* TTY_OP_END */
5617 ssh
->state
= SSH_STATE_INTERMED
;
5620 crWaitUntilV(ispkt
);
5621 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5622 unsigned i
= ssh2_pkt_getuint32(ssh
);
5623 struct ssh_channel
*c
;
5624 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5626 continue; /* nonexistent channel */
5627 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5629 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5631 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
5632 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
5633 bombout(("Unexpected response to pty request:"
5634 " packet type %d", ssh
->pktin
.type
));
5637 c_write_str(ssh
, "Server refused to allocate pty\r\n");
5638 ssh
->editing
= ssh
->echoing
= 1;
5640 logeventf(ssh
, "Allocated pty (ospeed %dbps, ispeed %dbps)",
5641 ssh
->ospeed
, ssh
->ispeed
);
5644 ssh
->editing
= ssh
->echoing
= 1;
5648 * Start a shell or a remote command. We may have to attempt
5649 * this twice if the config data has provided a second choice
5656 if (ssh
->fallback_cmd
) {
5657 subsys
= ssh
->cfg
.ssh_subsys2
;
5658 cmd
= ssh
->cfg
.remote_cmd_ptr2
;
5660 subsys
= ssh
->cfg
.ssh_subsys
;
5661 cmd
= ssh
->cfg
.remote_cmd_ptr
;
5664 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5665 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
); /* recipient channel */
5667 ssh2_pkt_addstring(ssh
, "subsystem");
5668 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5669 ssh2_pkt_addstring(ssh
, cmd
);
5671 ssh2_pkt_addstring(ssh
, "exec");
5672 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5673 ssh2_pkt_addstring(ssh
, cmd
);
5675 ssh2_pkt_addstring(ssh
, "shell");
5676 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5680 crWaitUntilV(ispkt
);
5681 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5682 unsigned i
= ssh2_pkt_getuint32(ssh
);
5683 struct ssh_channel
*c
;
5684 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5686 continue; /* nonexistent channel */
5687 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5689 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5690 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
5691 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
5692 bombout(("Unexpected response to shell/command request:"
5693 " packet type %d", ssh
->pktin
.type
));
5697 * We failed to start the command. If this is the
5698 * fallback command, we really are finished; if it's
5699 * not, and if the fallback command exists, try falling
5700 * back to it before complaining.
5702 if (!ssh
->fallback_cmd
&& ssh
->cfg
.remote_cmd_ptr2
!= NULL
) {
5703 logevent("Primary command failed; attempting fallback");
5704 ssh
->fallback_cmd
= TRUE
;
5707 bombout(("Server refused to start a shell/command"));
5710 logevent("Started a shell/command");
5715 ssh
->state
= SSH_STATE_SESSION
;
5716 if (ssh
->size_needed
)
5717 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
5718 if (ssh
->eof_needed
)
5719 ssh_special(ssh
, TS_EOF
);
5725 ldisc_send(ssh
->ldisc
, NULL
, 0, 0);/* cause ldisc to notice changes */
5729 s
->try_send
= FALSE
;
5731 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_DATA
||
5732 ssh
->pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
) {
5735 unsigned i
= ssh2_pkt_getuint32(ssh
);
5736 struct ssh_channel
*c
;
5737 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5739 continue; /* nonexistent channel */
5740 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
&&
5741 ssh2_pkt_getuint32(ssh
) != SSH2_EXTENDED_DATA_STDERR
)
5742 continue; /* extended but not stderr */
5743 ssh2_pkt_getstring(ssh
, &data
, &length
);
5746 c
->v
.v2
.locwindow
-= length
;
5748 case CHAN_MAINSESSION
:
5750 from_backend(ssh
->frontend
, ssh
->pktin
.type
==
5751 SSH2_MSG_CHANNEL_EXTENDED_DATA
,
5755 bufsize
= x11_send(c
->u
.x11
.s
, data
, length
);
5758 bufsize
= pfd_send(c
->u
.pfd
.s
, data
, length
);
5761 while (length
> 0) {
5762 if (c
->u
.a
.lensofar
< 4) {
5763 int l
= min(4 - c
->u
.a
.lensofar
, length
);
5764 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
,
5768 c
->u
.a
.lensofar
+= l
;
5770 if (c
->u
.a
.lensofar
== 4) {
5772 4 + GET_32BIT(c
->u
.a
.msglen
);
5773 c
->u
.a
.message
= snewn(c
->u
.a
.totallen
,
5775 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
5777 if (c
->u
.a
.lensofar
>= 4 && length
> 0) {
5779 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
5781 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
,
5785 c
->u
.a
.lensofar
+= l
;
5787 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
5790 if (agent_query(c
->u
.a
.message
,
5793 ssh_agentf_callback
, c
))
5794 ssh_agentf_callback(c
, reply
, replylen
);
5795 sfree(c
->u
.a
.message
);
5796 c
->u
.a
.lensofar
= 0;
5803 * If we are not buffering too much data,
5804 * enlarge the window again at the remote side.
5806 if (bufsize
< OUR_V2_WINSIZE
)
5807 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
5809 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_EOF
) {
5810 unsigned i
= ssh2_pkt_getuint32(ssh
);
5811 struct ssh_channel
*c
;
5813 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5815 continue; /* nonexistent channel */
5817 if (c
->type
== CHAN_X11
) {
5819 * Remote EOF on an X11 channel means we should
5820 * wrap up and close the channel ourselves.
5822 x11_close(c
->u
.x11
.s
);
5824 } else if (c
->type
== CHAN_AGENT
) {
5826 } else if (c
->type
== CHAN_SOCKDATA
) {
5827 pfd_close(c
->u
.pfd
.s
);
5830 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_CLOSE
) {
5831 unsigned i
= ssh2_pkt_getuint32(ssh
);
5832 struct ssh_channel
*c
;
5834 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5835 if (!c
|| ((int)c
->remoteid
) == -1) {
5836 bombout(("Received CHANNEL_CLOSE for %s channel %d\n",
5837 c ?
"half-open" : "nonexistent", i
));
5840 /* Do pre-close processing on the channel. */
5842 case CHAN_MAINSESSION
:
5843 break; /* nothing to see here, move along */
5845 if (c
->u
.x11
.s
!= NULL
)
5846 x11_close(c
->u
.x11
.s
);
5853 if (c
->u
.pfd
.s
!= NULL
)
5854 pfd_close(c
->u
.pfd
.s
);
5858 if (c
->closes
== 0) {
5859 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_CLOSE
);
5860 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
5863 del234(ssh
->channels
, c
);
5864 bufchain_clear(&c
->v
.v2
.outbuffer
);
5868 * See if that was the last channel left open.
5870 if (count234(ssh
->channels
) == 0) {
5871 logevent("All channels closed. Disconnecting");
5874 * We used to send SSH_MSG_DISCONNECT here,
5875 * because I'd believed that _every_ conforming
5876 * SSH2 connection had to end with a disconnect
5877 * being sent by at least one side; apparently
5878 * I was wrong and it's perfectly OK to
5879 * unceremoniously slam the connection shut
5880 * when you're done, and indeed OpenSSH feels
5881 * this is more polite than sending a
5882 * DISCONNECT. So now we don't.
5884 ssh2_pkt_init(ssh
, SSH2_MSG_DISCONNECT
);
5885 ssh2_pkt_adduint32(ssh
, SSH2_DISCONNECT_BY_APPLICATION
);
5886 ssh2_pkt_addstring(ssh
, "All open channels closed");
5887 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
5890 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5893 continue; /* remote sends close; ignore (FIXME) */
5894 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5895 unsigned i
= ssh2_pkt_getuint32(ssh
);
5896 struct ssh_channel
*c
;
5897 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5898 if (!c
|| c
->closes
)
5899 continue; /* nonexistent or closing channel */
5900 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5902 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
5903 unsigned i
= ssh2_pkt_getuint32(ssh
);
5904 struct ssh_channel
*c
;
5905 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5907 continue; /* nonexistent channel */
5908 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
5909 continue; /* dunno why they're confirming this */
5910 c
->remoteid
= ssh2_pkt_getuint32(ssh
);
5911 c
->type
= CHAN_SOCKDATA
;
5912 c
->v
.v2
.remwindow
= ssh2_pkt_getuint32(ssh
);
5913 c
->v
.v2
.remmaxpkt
= ssh2_pkt_getuint32(ssh
);
5915 pfd_confirm(c
->u
.pfd
.s
);
5918 * We have a pending close on this channel,
5919 * which we decided on before the server acked
5920 * the channel open. So now we know the
5921 * remoteid, we can close it again.
5923 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_CLOSE
);
5924 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
5927 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_OPEN_FAILURE
) {
5928 unsigned i
= ssh2_pkt_getuint32(ssh
);
5929 struct ssh_channel
*c
;
5930 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5932 continue; /* nonexistent channel */
5933 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
5934 continue; /* dunno why they're failing this */
5936 logevent("Forwarded connection refused by server");
5938 pfd_close(c
->u
.pfd
.s
);
5940 del234(ssh
->channels
, c
);
5942 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_REQUEST
) {
5945 int typelen
, want_reply
;
5946 struct ssh_channel
*c
;
5948 localid
= ssh2_pkt_getuint32(ssh
);
5949 ssh2_pkt_getstring(ssh
, &type
, &typelen
);
5950 want_reply
= ssh2_pkt_getbool(ssh
);
5953 * First, check that the channel exists. Otherwise,
5954 * we can instantly disconnect with a rude message.
5956 c
= find234(ssh
->channels
, &localid
, ssh_channelfind
);
5959 sprintf(buf
, "Received channel request for nonexistent"
5960 " channel %d", localid
);
5962 ssh2_pkt_init(ssh
, SSH2_MSG_DISCONNECT
);
5963 ssh2_pkt_adduint32(ssh
, SSH2_DISCONNECT_BY_APPLICATION
);
5964 ssh2_pkt_addstring(ssh
, buf
);
5965 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
5967 connection_fatal(ssh
->frontend
, "%s", buf
);
5968 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5973 * Having got the channel number, we now look at
5974 * the request type string to see if it's something
5977 if (typelen
== 11 && !memcmp(type
, "exit-status", 11) &&
5978 c
== ssh
->mainchan
) {
5979 /* We recognise "exit-status" on the primary channel. */
5981 ssh
->exitcode
= ssh2_pkt_getuint32(ssh
);
5982 sprintf(buf
, "Server sent command exit status %d",
5986 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_SUCCESS
);
5987 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
5992 * This is a channel request we don't know
5993 * about, so we now either ignore the request
5994 * or respond with CHANNEL_FAILURE, depending
5998 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_FAILURE
);
5999 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
6003 } else if (ssh
->pktin
.type
== SSH2_MSG_GLOBAL_REQUEST
) {
6005 int typelen
, want_reply
;
6007 ssh2_pkt_getstring(ssh
, &type
, &typelen
);
6008 want_reply
= ssh2_pkt_getbool(ssh
);
6011 * We currently don't support any global requests
6012 * at all, so we either ignore the request or
6013 * respond with REQUEST_FAILURE, depending on
6017 ssh2_pkt_init(ssh
, SSH2_MSG_REQUEST_FAILURE
);
6020 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_OPEN
) {
6027 struct ssh_channel
*c
;
6028 unsigned remid
, winsize
, pktsize
;
6029 ssh2_pkt_getstring(ssh
, &type
, &typelen
);
6030 c
= snew(struct ssh_channel
);
6033 remid
= ssh2_pkt_getuint32(ssh
);
6034 winsize
= ssh2_pkt_getuint32(ssh
);
6035 pktsize
= ssh2_pkt_getuint32(ssh
);
6037 if (typelen
== 3 && !memcmp(type
, "x11", 3)) {
6040 ssh2_pkt_getstring(ssh
, &peeraddr
, &peeraddrlen
);
6041 addrstr
= snewn(peeraddrlen
+1, char);
6042 memcpy(addrstr
, peeraddr
, peeraddrlen
);
6043 peeraddr
[peeraddrlen
] = '\0';
6044 peerport
= ssh2_pkt_getuint32(ssh
);
6046 if (!ssh
->X11_fwd_enabled
)
6047 error
= "X11 forwarding is not enabled";
6048 else if (x11_init(&c
->u
.x11
.s
, ssh
->cfg
.x11_display
, c
,
6049 ssh
->x11auth
, addrstr
, peerport
,
6050 &ssh
->cfg
) != NULL
) {
6051 error
= "Unable to open an X11 connection";
6057 } else if (typelen
== 15 &&
6058 !memcmp(type
, "forwarded-tcpip", 15)) {
6059 struct ssh_rportfwd pf
, *realpf
;
6062 ssh2_pkt_getstring(ssh
, &dummy
, &dummylen
);/* skip address */
6063 pf
.sport
= ssh2_pkt_getuint32(ssh
);
6064 ssh2_pkt_getstring(ssh
, &peeraddr
, &peeraddrlen
);
6065 peerport
= ssh2_pkt_getuint32(ssh
);
6066 realpf
= find234(ssh
->rportfwds
, &pf
, NULL
);
6067 if (realpf
== NULL
) {
6068 error
= "Remote port is not recognised";
6070 const char *e
= pfd_newconnect(&c
->u
.pfd
.s
,
6074 logeventf(ssh
, "Received remote port open request"
6075 " for %s:%d", realpf
->dhost
, realpf
->dport
);
6077 logeventf(ssh
, "Port open failed: %s", e
);
6078 error
= "Port open failed";
6080 logevent("Forwarded port opened successfully");
6081 c
->type
= CHAN_SOCKDATA
;
6084 } else if (typelen
== 22 &&
6085 !memcmp(type
, "auth-agent@openssh.com", 3)) {
6086 if (!ssh
->agentfwd_enabled
)
6087 error
= "Agent forwarding is not enabled";
6089 c
->type
= CHAN_AGENT
; /* identify channel type */
6090 c
->u
.a
.lensofar
= 0;
6093 error
= "Unsupported channel type requested";
6096 c
->remoteid
= remid
;
6098 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_OPEN_FAILURE
);
6099 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
6100 ssh2_pkt_adduint32(ssh
, SSH2_OPEN_CONNECT_FAILED
);
6101 ssh2_pkt_addstring(ssh
, error
);
6102 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
6106 c
->localid
= alloc_channel_id(ssh
);
6108 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
6109 c
->v
.v2
.remwindow
= winsize
;
6110 c
->v
.v2
.remmaxpkt
= pktsize
;
6111 bufchain_init(&c
->v
.v2
.outbuffer
);
6112 add234(ssh
->channels
, c
);
6113 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
);
6114 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
6115 ssh2_pkt_adduint32(ssh
, c
->localid
);
6116 ssh2_pkt_adduint32(ssh
, c
->v
.v2
.locwindow
);
6117 ssh2_pkt_adduint32(ssh
, 0x4000UL
); /* our max pkt size */
6121 bombout(("Strange packet received: type %d", ssh
->pktin
.type
));
6126 * We have spare data. Add it to the channel buffer.
6128 ssh2_add_channel_data(ssh
->mainchan
, (char *)in
, inlen
);
6133 struct ssh_channel
*c
;
6135 * Try to send data on all channels if we can.
6137 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
6140 continue; /* don't send on closing channels */
6141 bufsize
= ssh2_try_send(c
);
6144 case CHAN_MAINSESSION
:
6145 /* stdin need not receive an unthrottle
6146 * notification since it will be polled */
6149 x11_unthrottle(c
->u
.x11
.s
);
6152 /* agent sockets are request/response and need no
6153 * buffer management */
6156 pfd_unthrottle(c
->u
.pfd
.s
);
6168 * Handle the top-level SSH2 protocol.
6170 static void ssh2_protocol(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
6172 if (do_ssh2_transport(ssh
, in
, inlen
, ispkt
) == 0)
6174 do_ssh2_authconn(ssh
, in
, inlen
, ispkt
);
6178 * Called to set up the connection.
6180 * Returns an error message, or NULL on success.
6182 static const char *ssh_init(void *frontend_handle
, void **backend_handle
,
6184 char *host
, int port
, char **realhost
, int nodelay
)
6189 ssh
= snew(struct ssh_tag
);
6190 ssh
->cfg
= *cfg
; /* STRUCTURE COPY */
6191 ssh
->version
= 0; /* when not ready yet */
6194 ssh
->v1_cipher_ctx
= NULL
;
6195 ssh
->crcda_ctx
= NULL
;
6196 ssh
->cscipher
= NULL
;
6197 ssh
->cs_cipher_ctx
= NULL
;
6198 ssh
->sccipher
= NULL
;
6199 ssh
->sc_cipher_ctx
= NULL
;
6201 ssh
->cs_mac_ctx
= NULL
;
6203 ssh
->sc_mac_ctx
= NULL
;
6205 ssh
->cs_comp_ctx
= NULL
;
6207 ssh
->sc_comp_ctx
= NULL
;
6209 ssh
->kex_ctx
= NULL
;
6210 ssh
->hostkey
= NULL
;
6212 ssh
->state
= SSH_STATE_PREPACKET
;
6213 ssh
->size_needed
= FALSE
;
6214 ssh
->eof_needed
= FALSE
;
6218 static const struct Packet empty
= { 0, 0, NULL
, NULL
, 0 };
6219 ssh
->pktin
= ssh
->pktout
= empty
;
6221 ssh
->deferred_send_data
= NULL
;
6222 ssh
->deferred_len
= 0;
6223 ssh
->deferred_size
= 0;
6224 ssh
->fallback_cmd
= 0;
6226 ssh
->x11auth
= NULL
;
6227 ssh
->v1_compressing
= FALSE
;
6228 ssh
->v2_outgoing_sequence
= 0;
6229 ssh
->ssh1_rdpkt_crstate
= 0;
6230 ssh
->ssh2_rdpkt_crstate
= 0;
6231 ssh
->do_ssh_init_crstate
= 0;
6232 ssh
->ssh_gotdata_crstate
= 0;
6233 ssh
->ssh1_protocol_crstate
= 0;
6234 ssh
->do_ssh1_login_crstate
= 0;
6235 ssh
->do_ssh2_transport_crstate
= 0;
6236 ssh
->do_ssh2_authconn_crstate
= 0;
6237 ssh
->do_ssh_init_state
= NULL
;
6238 ssh
->do_ssh1_login_state
= NULL
;
6239 ssh
->do_ssh2_transport_state
= NULL
;
6240 ssh
->do_ssh2_authconn_state
= NULL
;
6241 ssh
->mainchan
= NULL
;
6242 ssh
->throttled_all
= 0;
6243 ssh
->v1_stdout_throttling
= 0;
6245 *backend_handle
= ssh
;
6248 if (crypto_startup() == 0)
6249 return "Microsoft high encryption pack not installed!";
6252 ssh
->frontend
= frontend_handle
;
6253 ssh
->term_width
= ssh
->cfg
.width
;
6254 ssh
->term_height
= ssh
->cfg
.height
;
6256 ssh
->channels
= NULL
;
6257 ssh
->rportfwds
= NULL
;
6262 ssh
->v1_throttle_count
= 0;
6263 ssh
->overall_bufsize
= 0;
6264 ssh
->fallback_cmd
= 0;
6266 ssh
->protocol
= NULL
;
6268 p
= connect_to_host(ssh
, host
, port
, realhost
, nodelay
);
6275 static void ssh_free(void *handle
)
6277 Ssh ssh
= (Ssh
) handle
;
6278 struct ssh_channel
*c
;
6279 struct ssh_rportfwd
*pf
;
6281 if (ssh
->v1_cipher_ctx
)
6282 ssh
->cipher
->free_context(ssh
->v1_cipher_ctx
);
6283 if (ssh
->cs_cipher_ctx
)
6284 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
6285 if (ssh
->sc_cipher_ctx
)
6286 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
6287 if (ssh
->cs_mac_ctx
)
6288 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
6289 if (ssh
->sc_mac_ctx
)
6290 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
6291 if (ssh
->cs_comp_ctx
) {
6293 ssh
->cscomp
->compress_cleanup(ssh
->cs_comp_ctx
);
6295 zlib_compress_cleanup(ssh
->cs_comp_ctx
);
6297 if (ssh
->sc_comp_ctx
) {
6299 ssh
->sccomp
->decompress_cleanup(ssh
->sc_comp_ctx
);
6301 zlib_decompress_cleanup(ssh
->sc_comp_ctx
);
6304 dh_cleanup(ssh
->kex_ctx
);
6305 sfree(ssh
->savedhost
);
6307 if (ssh
->channels
) {
6308 while ((c
= delpos234(ssh
->channels
, 0)) != NULL
) {
6311 if (c
->u
.x11
.s
!= NULL
)
6312 x11_close(c
->u
.x11
.s
);
6315 if (c
->u
.pfd
.s
!= NULL
)
6316 pfd_close(c
->u
.pfd
.s
);
6321 freetree234(ssh
->channels
);
6324 if (ssh
->rportfwds
) {
6325 while ((pf
= delpos234(ssh
->rportfwds
, 0)) != NULL
)
6327 freetree234(ssh
->rportfwds
);
6329 sfree(ssh
->deferred_send_data
);
6331 x11_free_auth(ssh
->x11auth
);
6332 sfree(ssh
->do_ssh_init_state
);
6333 sfree(ssh
->do_ssh1_login_state
);
6334 sfree(ssh
->do_ssh2_transport_state
);
6335 sfree(ssh
->do_ssh2_authconn_state
);
6336 if (ssh
->pktout
.data
) {
6337 sfree(ssh
->pktout
.data
);
6338 ssh
->pktout
.data
= NULL
;
6340 if (ssh
->pktin
.data
) {
6341 sfree(ssh
->pktin
.data
);
6342 ssh
->pktin
.data
= NULL
;
6344 if (ssh
->crcda_ctx
) {
6345 crcda_free_context(ssh
->crcda_ctx
);
6346 ssh
->crcda_ctx
= NULL
;
6349 log_free(ssh
->logctx
);
6358 * Reconfigure the SSH backend.
6360 * Currently, this function does nothing very useful. In future,
6361 * however, we could do some handy things with it. For example, we
6362 * could make the port forwarding configurer active in the Change
6363 * Settings box, and this routine could close down existing
6364 * forwardings and open up new ones in response to changes.
6366 static void ssh_reconfig(void *handle
, Config
*cfg
)
6368 Ssh ssh
= (Ssh
) handle
;
6369 ssh
->cfg
= *cfg
; /* STRUCTURE COPY */
6373 * Called to send data down the Telnet connection.
6375 static int ssh_send(void *handle
, char *buf
, int len
)
6377 Ssh ssh
= (Ssh
) handle
;
6379 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
6382 ssh
->protocol(ssh
, (unsigned char *)buf
, len
, 0);
6384 return ssh_sendbuffer(ssh
);
6388 * Called to query the current amount of buffered stdin data.
6390 static int ssh_sendbuffer(void *handle
)
6392 Ssh ssh
= (Ssh
) handle
;
6395 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
6399 * If the SSH socket itself has backed up, add the total backup
6400 * size on that to any individual buffer on the stdin channel.
6403 if (ssh
->throttled_all
)
6404 override_value
= ssh
->overall_bufsize
;
6406 if (ssh
->version
== 1) {
6407 return override_value
;
6408 } else if (ssh
->version
== 2) {
6409 if (!ssh
->mainchan
|| ssh
->mainchan
->closes
> 0)
6410 return override_value
;
6412 return (override_value
+
6413 bufchain_size(&ssh
->mainchan
->v
.v2
.outbuffer
));
6420 * Called to set the size of the window from SSH's POV.
6422 static void ssh_size(void *handle
, int width
, int height
)
6424 Ssh ssh
= (Ssh
) handle
;
6426 ssh
->term_width
= width
;
6427 ssh
->term_height
= height
;
6429 switch (ssh
->state
) {
6430 case SSH_STATE_BEFORE_SIZE
:
6431 case SSH_STATE_PREPACKET
:
6432 case SSH_STATE_CLOSED
:
6433 break; /* do nothing */
6434 case SSH_STATE_INTERMED
:
6435 ssh
->size_needed
= TRUE
; /* buffer for later */
6437 case SSH_STATE_SESSION
:
6438 if (!ssh
->cfg
.nopty
) {
6439 if (ssh
->version
== 1) {
6440 send_packet(ssh
, SSH1_CMSG_WINDOW_SIZE
,
6441 PKT_INT
, ssh
->term_height
,
6442 PKT_INT
, ssh
->term_width
,
6443 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
6445 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
6446 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
6447 ssh2_pkt_addstring(ssh
, "window-change");
6448 ssh2_pkt_addbool(ssh
, 0);
6449 ssh2_pkt_adduint32(ssh
, ssh
->term_width
);
6450 ssh2_pkt_adduint32(ssh
, ssh
->term_height
);
6451 ssh2_pkt_adduint32(ssh
, 0);
6452 ssh2_pkt_adduint32(ssh
, 0);
6461 * Return a list of the special codes that make sense in this
6464 static const struct telnet_special
*ssh_get_specials(void *handle
)
6466 Ssh ssh
= (Ssh
) handle
;
6468 if (ssh
->version
== 1) {
6469 static const struct telnet_special ssh1_specials
[] = {
6470 {"IGNORE message", TS_NOP
},
6473 return ssh1_specials
;
6474 } else if (ssh
->version
== 2) {
6475 static const struct telnet_special ssh2_specials
[] = {
6477 {"IGNORE message", TS_NOP
},
6480 return ssh2_specials
;
6486 * Send Telnet special codes. TS_EOF is useful for `plink', so you
6487 * can send an EOF and collect resulting output (e.g. `plink
6490 static void ssh_special(void *handle
, Telnet_Special code
)
6492 Ssh ssh
= (Ssh
) handle
;
6494 if (code
== TS_EOF
) {
6495 if (ssh
->state
!= SSH_STATE_SESSION
) {
6497 * Buffer the EOF in case we are pre-SESSION, so we can
6498 * send it as soon as we reach SESSION.
6501 ssh
->eof_needed
= TRUE
;
6504 if (ssh
->version
== 1) {
6505 send_packet(ssh
, SSH1_CMSG_EOF
, PKT_END
);
6507 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_EOF
);
6508 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
6511 logevent("Sent EOF message");
6512 } else if (code
== TS_PING
|| code
== TS_NOP
) {
6513 if (ssh
->state
== SSH_STATE_CLOSED
6514 || ssh
->state
== SSH_STATE_PREPACKET
) return;
6515 if (ssh
->version
== 1) {
6516 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
))
6517 send_packet(ssh
, SSH1_MSG_IGNORE
, PKT_STR
, "", PKT_END
);
6519 ssh2_pkt_init(ssh
, SSH2_MSG_IGNORE
);
6520 ssh2_pkt_addstring_start(ssh
);
6523 } else if (code
== TS_BRK
) {
6524 if (ssh
->state
== SSH_STATE_CLOSED
6525 || ssh
->state
== SSH_STATE_PREPACKET
) return;
6526 if (ssh
->version
== 1) {
6527 logevent("Unable to send BREAK signal in SSH1");
6529 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
6530 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
6531 ssh2_pkt_addstring(ssh
, "break");
6532 ssh2_pkt_addbool(ssh
, 0);
6533 ssh2_pkt_adduint32(ssh
, 0); /* default break length */
6541 void *new_sock_channel(void *handle
, Socket s
)
6543 Ssh ssh
= (Ssh
) handle
;
6544 struct ssh_channel
*c
;
6545 c
= snew(struct ssh_channel
);
6549 c
->remoteid
= -1; /* to be set when open confirmed */
6550 c
->localid
= alloc_channel_id(ssh
);
6552 c
->type
= CHAN_SOCKDATA_DORMANT
;/* identify channel type */
6554 bufchain_init(&c
->v
.v2
.outbuffer
);
6555 add234(ssh
->channels
, c
);
6561 * This is called when stdout/stderr (the entity to which
6562 * from_backend sends data) manages to clear some backlog.
6564 static void ssh_unthrottle(void *handle
, int bufsize
)
6566 Ssh ssh
= (Ssh
) handle
;
6567 if (ssh
->version
== 1) {
6568 if (ssh
->v1_stdout_throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
6569 ssh
->v1_stdout_throttling
= 0;
6570 ssh1_throttle(ssh
, -1);
6573 if (ssh
->mainchan
&& ssh
->mainchan
->closes
== 0)
6574 ssh2_set_window(ssh
->mainchan
, OUR_V2_WINSIZE
- bufsize
);
6578 void ssh_send_port_open(void *channel
, char *hostname
, int port
, char *org
)
6580 struct ssh_channel
*c
= (struct ssh_channel
*)channel
;
6583 logeventf(ssh
, "Opening forwarded connection to %s:%d", hostname
, port
);
6585 if (ssh
->version
== 1) {
6586 send_packet(ssh
, SSH1_MSG_PORT_OPEN
,
6587 PKT_INT
, c
->localid
,
6590 //PKT_STR, <org:orgport>,
6593 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_OPEN
);
6594 ssh2_pkt_addstring(ssh
, "direct-tcpip");
6595 ssh2_pkt_adduint32(ssh
, c
->localid
);
6596 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
6597 ssh2_pkt_adduint32(ssh
, c
->v
.v2
.locwindow
);/* our window size */
6598 ssh2_pkt_adduint32(ssh
, 0x4000UL
); /* our max pkt size */
6599 ssh2_pkt_addstring(ssh
, hostname
);
6600 ssh2_pkt_adduint32(ssh
, port
);
6602 * We make up values for the originator data; partly it's
6603 * too much hassle to keep track, and partly I'm not
6604 * convinced the server should be told details like that
6605 * about my local network configuration.
6607 ssh2_pkt_addstring(ssh
, "client-side-connection");
6608 ssh2_pkt_adduint32(ssh
, 0);
6614 static Socket
ssh_socket(void *handle
)
6616 Ssh ssh
= (Ssh
) handle
;
6620 static int ssh_sendok(void *handle
)
6622 Ssh ssh
= (Ssh
) handle
;
6623 return ssh
->send_ok
;
6626 static int ssh_ldisc(void *handle
, int option
)
6628 Ssh ssh
= (Ssh
) handle
;
6629 if (option
== LD_ECHO
)
6630 return ssh
->echoing
;
6631 if (option
== LD_EDIT
)
6632 return ssh
->editing
;
6636 static void ssh_provide_ldisc(void *handle
, void *ldisc
)
6638 Ssh ssh
= (Ssh
) handle
;
6642 static void ssh_provide_logctx(void *handle
, void *logctx
)
6644 Ssh ssh
= (Ssh
) handle
;
6645 ssh
->logctx
= logctx
;
6648 static int ssh_return_exitcode(void *handle
)
6650 Ssh ssh
= (Ssh
) handle
;
6654 return (ssh
->exitcode
>= 0 ? ssh
->exitcode
: 0);
6658 * Gross hack: pscp will try to start SFTP but fall back to scp1 if
6659 * that fails. This variable is the means by which scp.c can reach
6660 * into the SSH code and find out which one it got.
6662 extern int ssh_fallback_cmd(void *handle
)
6664 Ssh ssh
= (Ssh
) handle
;
6665 return ssh
->fallback_cmd
;
6668 Backend ssh_backend
= {
6678 ssh_return_exitcode
,