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;
868 ssh
->pktin
.savedpos
= 0;
870 if (ssh
->v1_compressing
) {
871 unsigned char *decompblk
;
873 if (!zlib_decompress_block(ssh
->sc_comp_ctx
,
874 ssh
->pktin
.body
- 1, ssh
->pktin
.length
+ 1,
875 &decompblk
, &decomplen
)) {
876 bombout(("Zlib decompression encountered invalid data"));
880 if (ssh
->pktin
.maxlen
< st
->pad
+ decomplen
) {
881 ssh
->pktin
.maxlen
= st
->pad
+ decomplen
;
882 ssh
->pktin
.data
= sresize(ssh
->pktin
.data
,
883 ssh
->pktin
.maxlen
+ APIEXTRA
,
885 ssh
->pktin
.body
= ssh
->pktin
.data
+ st
->pad
+ 1;
888 memcpy(ssh
->pktin
.body
- 1, decompblk
, decomplen
);
890 ssh
->pktin
.length
= decomplen
- 1;
893 ssh
->pktin
.type
= ssh
->pktin
.body
[-1];
896 log_packet(ssh
->logctx
,
897 PKT_INCOMING
, ssh
->pktin
.type
,
898 ssh1_pkt_type(ssh
->pktin
.type
),
899 ssh
->pktin
.body
, ssh
->pktin
.length
);
901 if (ssh
->pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
902 ssh
->pktin
.type
== SSH1_SMSG_STDERR_DATA
||
903 ssh
->pktin
.type
== SSH1_MSG_DEBUG
||
904 ssh
->pktin
.type
== SSH1_SMSG_AUTH_TIS_CHALLENGE
||
905 ssh
->pktin
.type
== SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
906 long stringlen
= GET_32BIT(ssh
->pktin
.body
);
907 if (stringlen
+ 4 != ssh
->pktin
.length
) {
908 bombout(("Received data packet with bogus string length"));
913 if (ssh
->pktin
.type
== SSH1_MSG_DEBUG
) {
914 /* log debug message */
916 int stringlen
= GET_32BIT(ssh
->pktin
.body
);
917 strcpy(buf
, "Remote debug message: ");
920 memcpy(buf
+ 8, ssh
->pktin
.body
+ 4, stringlen
);
921 buf
[8 + stringlen
] = '\0';
924 } else if (ssh
->pktin
.type
== SSH1_MSG_IGNORE
) {
929 if (ssh
->pktin
.type
== SSH1_MSG_DISCONNECT
) {
930 /* log reason code in disconnect message */
932 unsigned msglen
= GET_32BIT(ssh
->pktin
.body
);
934 strcpy(buf
, "Remote sent disconnect: ");
935 nowlen
= strlen(buf
);
936 if (msglen
> sizeof(buf
) - nowlen
- 1)
937 msglen
= sizeof(buf
) - nowlen
- 1;
938 memcpy(buf
+ nowlen
, ssh
->pktin
.body
+ 4, msglen
);
939 buf
[nowlen
+ msglen
] = '\0';
940 /* logevent(buf); (this is now done within the bombout macro) */
941 bombout(("Server sent disconnect message:\n\"%s\"", buf
+nowlen
));
948 static int ssh2_rdpkt(Ssh ssh
, unsigned char **data
, int *datalen
)
950 struct rdpkt2_state_tag
*st
= &ssh
->rdpkt2_state
;
952 crBegin(ssh
->ssh2_rdpkt_crstate
);
956 ssh
->pktin
.length
= 0;
958 st
->cipherblk
= ssh
->sccipher
->blksize
;
961 if (st
->cipherblk
< 8)
964 if (ssh
->pktin
.maxlen
< st
->cipherblk
) {
965 ssh
->pktin
.maxlen
= st
->cipherblk
;
966 ssh
->pktin
.data
= sresize(ssh
->pktin
.data
, st
->cipherblk
+ APIEXTRA
,
971 * Acquire and decrypt the first block of the packet. This will
972 * contain the length and padding details.
974 for (st
->i
= st
->len
= 0; st
->i
< st
->cipherblk
; st
->i
++) {
975 while ((*datalen
) == 0)
976 crReturn(st
->cipherblk
- st
->i
);
977 ssh
->pktin
.data
[st
->i
] = *(*data
)++;
982 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
983 ssh
->pktin
.data
, st
->cipherblk
);
986 * Now get the length and padding figures.
988 st
->len
= GET_32BIT(ssh
->pktin
.data
);
989 st
->pad
= ssh
->pktin
.data
[4];
992 * _Completely_ silly lengths should be stomped on before they
993 * do us any more damage.
995 if (st
->len
< 0 || st
->pad
< 0 || st
->len
+ st
->pad
< 0) {
996 bombout(("Incoming packet was garbled on decryption"));
1001 * This enables us to deduce the payload length.
1003 st
->payload
= st
->len
- st
->pad
- 1;
1005 ssh
->pktin
.length
= st
->payload
+ 5;
1008 * So now we can work out the total packet length.
1010 st
->packetlen
= st
->len
+ 4;
1011 st
->maclen
= ssh
->scmac ? ssh
->scmac
->len
: 0;
1014 * Adjust memory allocation if packet is too big.
1016 if (ssh
->pktin
.maxlen
< st
->packetlen
+ st
->maclen
) {
1017 ssh
->pktin
.maxlen
= st
->packetlen
+ st
->maclen
;
1018 ssh
->pktin
.data
= sresize(ssh
->pktin
.data
,
1019 ssh
->pktin
.maxlen
+ APIEXTRA
,
1024 * Read and decrypt the remainder of the packet.
1026 for (st
->i
= st
->cipherblk
; st
->i
< st
->packetlen
+ st
->maclen
;
1028 while ((*datalen
) == 0)
1029 crReturn(st
->packetlen
+ st
->maclen
- st
->i
);
1030 ssh
->pktin
.data
[st
->i
] = *(*data
)++;
1033 /* Decrypt everything _except_ the MAC. */
1035 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
1036 ssh
->pktin
.data
+ st
->cipherblk
,
1037 st
->packetlen
- st
->cipherblk
);
1043 && !ssh
->scmac
->verify(ssh
->sc_mac_ctx
, ssh
->pktin
.data
, st
->len
+ 4,
1044 st
->incoming_sequence
)) {
1045 bombout(("Incorrect MAC received on packet"));
1048 st
->incoming_sequence
++; /* whether or not we MACed */
1051 * Decompress packet payload.
1054 unsigned char *newpayload
;
1057 ssh
->sccomp
->decompress(ssh
->sc_comp_ctx
,
1058 ssh
->pktin
.data
+ 5, ssh
->pktin
.length
- 5,
1059 &newpayload
, &newlen
)) {
1060 if (ssh
->pktin
.maxlen
< newlen
+ 5) {
1061 ssh
->pktin
.maxlen
= newlen
+ 5;
1062 ssh
->pktin
.data
= sresize(ssh
->pktin
.data
,
1063 ssh
->pktin
.maxlen
+ APIEXTRA
,
1066 ssh
->pktin
.length
= 5 + newlen
;
1067 memcpy(ssh
->pktin
.data
+ 5, newpayload
, newlen
);
1072 ssh
->pktin
.savedpos
= 6;
1073 ssh
->pktin
.body
= ssh
->pktin
.data
;
1074 ssh
->pktin
.type
= ssh
->pktin
.data
[5];
1077 log_packet(ssh
->logctx
, PKT_INCOMING
, ssh
->pktin
.type
,
1078 ssh2_pkt_type(ssh
->pkt_ctx
, ssh
->pktin
.type
),
1079 ssh
->pktin
.data
+6, ssh
->pktin
.length
-6);
1081 switch (ssh
->pktin
.type
) {
1083 * These packets we must handle instantly.
1085 case SSH2_MSG_DISCONNECT
:
1087 /* log reason code in disconnect message */
1090 int reason
= GET_32BIT(ssh
->pktin
.data
+ 6);
1091 unsigned msglen
= GET_32BIT(ssh
->pktin
.data
+ 10);
1093 if (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) {
1094 buf
= dupprintf("Received disconnect message (%s)",
1095 ssh2_disconnect_reasons
[reason
]);
1097 buf
= dupprintf("Received disconnect message (unknown"
1098 " type %d)", reason
);
1102 buf
= dupprintf("Disconnection message text: %n%.*s",
1103 &nowlen
, msglen
, ssh
->pktin
.data
+ 14);
1105 bombout(("Server sent disconnect message\ntype %d (%s):\n\"%s\"",
1107 (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) ?
1108 ssh2_disconnect_reasons
[reason
] : "unknown",
1114 case SSH2_MSG_IGNORE
:
1116 case SSH2_MSG_DEBUG
:
1118 /* log the debug message */
1120 /* int display = ssh->pktin.body[6]; */
1121 int stringlen
= GET_32BIT(ssh
->pktin
.data
+7);
1123 strcpy(buf
, "Remote debug message: ");
1124 prefix
= strlen(buf
);
1125 if (stringlen
> (int)(sizeof(buf
)-prefix
-1))
1126 stringlen
= sizeof(buf
)-prefix
-1;
1127 memcpy(buf
+ prefix
, ssh
->pktin
.data
+ 11, stringlen
);
1128 buf
[prefix
+ stringlen
] = '\0';
1131 goto next_packet
; /* FIXME: print the debug message */
1134 * These packets we need do nothing about here.
1136 case SSH2_MSG_UNIMPLEMENTED
:
1137 case SSH2_MSG_SERVICE_REQUEST
:
1138 case SSH2_MSG_SERVICE_ACCEPT
:
1139 case SSH2_MSG_KEXINIT
:
1140 case SSH2_MSG_NEWKEYS
:
1141 case SSH2_MSG_KEXDH_INIT
:
1142 case SSH2_MSG_KEXDH_REPLY
:
1143 /* case SSH2_MSG_KEX_DH_GEX_REQUEST: duplicate case value */
1144 /* case SSH2_MSG_KEX_DH_GEX_GROUP: duplicate case value */
1145 case SSH2_MSG_KEX_DH_GEX_INIT
:
1146 case SSH2_MSG_KEX_DH_GEX_REPLY
:
1147 case SSH2_MSG_USERAUTH_REQUEST
:
1148 case SSH2_MSG_USERAUTH_FAILURE
:
1149 case SSH2_MSG_USERAUTH_SUCCESS
:
1150 case SSH2_MSG_USERAUTH_BANNER
:
1151 case SSH2_MSG_USERAUTH_PK_OK
:
1152 /* case SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ: duplicate case value */
1153 /* case SSH2_MSG_USERAUTH_INFO_REQUEST: duplicate case value */
1154 case SSH2_MSG_USERAUTH_INFO_RESPONSE
:
1155 case SSH2_MSG_GLOBAL_REQUEST
:
1156 case SSH2_MSG_REQUEST_SUCCESS
:
1157 case SSH2_MSG_REQUEST_FAILURE
:
1158 case SSH2_MSG_CHANNEL_OPEN
:
1159 case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
:
1160 case SSH2_MSG_CHANNEL_OPEN_FAILURE
:
1161 case SSH2_MSG_CHANNEL_WINDOW_ADJUST
:
1162 case SSH2_MSG_CHANNEL_DATA
:
1163 case SSH2_MSG_CHANNEL_EXTENDED_DATA
:
1164 case SSH2_MSG_CHANNEL_EOF
:
1165 case SSH2_MSG_CHANNEL_CLOSE
:
1166 case SSH2_MSG_CHANNEL_REQUEST
:
1167 case SSH2_MSG_CHANNEL_SUCCESS
:
1168 case SSH2_MSG_CHANNEL_FAILURE
:
1172 * For anything else we send SSH2_MSG_UNIMPLEMENTED.
1175 ssh2_pkt_init(ssh
, SSH2_MSG_UNIMPLEMENTED
);
1176 ssh2_pkt_adduint32(ssh
, st
->incoming_sequence
- 1);
1184 static void ssh1_pktout_size(Ssh ssh
, int len
)
1188 len
+= 5; /* type and CRC */
1189 pad
= 8 - (len
% 8);
1192 ssh
->pktout
.length
= len
- 5;
1193 if (ssh
->pktout
.maxlen
< biglen
) {
1194 ssh
->pktout
.maxlen
= biglen
;
1196 /* Allocate enough buffer space for extra block
1197 * for MS CryptEncrypt() */
1198 ssh
->pktout
.data
= sresize(ssh
->pktout
.data
, biglen
+ 12,
1201 ssh
->pktout
.data
= sresize(ssh
->pktout
.data
, biglen
+ 4,
1205 ssh
->pktout
.body
= ssh
->pktout
.data
+ 4 + pad
+ 1;
1208 static void s_wrpkt_start(Ssh ssh
, int type
, int len
)
1210 ssh1_pktout_size(ssh
, len
);
1211 ssh
->pktout
.type
= type
;
1214 static int s_wrpkt_prepare(Ssh ssh
)
1220 * XXX various versions of SC (including 8.8.4) screw up the
1221 * register allocation in this function and use the same register
1222 * (D6) for len and as a temporary, with predictable results. The
1223 * following sledgehammer prevents this.
1229 ssh
->pktout
.body
[-1] = ssh
->pktout
.type
;
1232 log_packet(ssh
->logctx
, PKT_OUTGOING
, ssh
->pktout
.type
,
1233 ssh1_pkt_type(ssh
->pktout
.type
),
1234 ssh
->pktout
.body
, ssh
->pktout
.length
);
1236 if (ssh
->v1_compressing
) {
1237 unsigned char *compblk
;
1239 zlib_compress_block(ssh
->cs_comp_ctx
,
1240 ssh
->pktout
.body
- 1, ssh
->pktout
.length
+ 1,
1241 &compblk
, &complen
);
1242 ssh1_pktout_size(ssh
, complen
- 1);
1243 memcpy(ssh
->pktout
.body
- 1, compblk
, complen
);
1247 len
= ssh
->pktout
.length
+ 5; /* type and CRC */
1248 pad
= 8 - (len
% 8);
1251 for (i
= 0; i
< pad
; i
++)
1252 ssh
->pktout
.data
[i
+ 4] = random_byte();
1253 crc
= crc32_compute(ssh
->pktout
.data
+ 4, biglen
- 4);
1254 PUT_32BIT(ssh
->pktout
.data
+ biglen
, crc
);
1255 PUT_32BIT(ssh
->pktout
.data
, len
);
1258 ssh
->cipher
->encrypt(ssh
->v1_cipher_ctx
, ssh
->pktout
.data
+ 4, biglen
);
1263 static void s_wrpkt(Ssh ssh
)
1266 len
= s_wrpkt_prepare(ssh
);
1267 backlog
= sk_write(ssh
->s
, (char *)ssh
->pktout
.data
, len
);
1268 if (backlog
> SSH_MAX_BACKLOG
)
1269 ssh_throttle_all(ssh
, 1, backlog
);
1272 static void s_wrpkt_defer(Ssh ssh
)
1275 len
= s_wrpkt_prepare(ssh
);
1276 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1277 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1278 ssh
->deferred_send_data
= sresize(ssh
->deferred_send_data
,
1282 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, ssh
->pktout
.data
, len
);
1283 ssh
->deferred_len
+= len
;
1287 * Construct a packet with the specified contents.
1289 static void construct_packet(Ssh ssh
, int pkttype
, va_list ap1
, va_list ap2
)
1291 unsigned char *p
, *argp
, argchar
;
1292 unsigned long argint
;
1293 int pktlen
, argtype
, arglen
;
1297 while ((argtype
= va_arg(ap1
, int)) != PKT_END
) {
1300 (void) va_arg(ap1
, int);
1304 (void) va_arg(ap1
, int);
1308 (void) va_arg(ap1
, unsigned char *);
1309 arglen
= va_arg(ap1
, int);
1313 argp
= va_arg(ap1
, unsigned char *);
1314 arglen
= strlen((char *)argp
);
1315 pktlen
+= 4 + arglen
;
1318 bn
= va_arg(ap1
, Bignum
);
1319 pktlen
+= ssh1_bignum_length(bn
);
1326 s_wrpkt_start(ssh
, pkttype
, pktlen
);
1327 p
= ssh
->pktout
.body
;
1329 while ((argtype
= va_arg(ap2
, int)) != PKT_END
) {
1332 argint
= va_arg(ap2
, int);
1333 PUT_32BIT(p
, argint
);
1337 argchar
= (unsigned char) va_arg(ap2
, int);
1342 argp
= va_arg(ap2
, unsigned char *);
1343 arglen
= va_arg(ap2
, int);
1344 memcpy(p
, argp
, arglen
);
1348 argp
= va_arg(ap2
, unsigned char *);
1349 arglen
= strlen((char *)argp
);
1350 PUT_32BIT(p
, arglen
);
1351 memcpy(p
+ 4, argp
, arglen
);
1355 bn
= va_arg(ap2
, Bignum
);
1356 p
+= ssh1_write_bignum(p
, bn
);
1362 static void send_packet(Ssh ssh
, int pkttype
, ...)
1365 va_start(ap1
, pkttype
);
1366 va_start(ap2
, pkttype
);
1367 construct_packet(ssh
, pkttype
, ap1
, ap2
);
1371 static void defer_packet(Ssh ssh
, int pkttype
, ...)
1374 va_start(ap1
, pkttype
);
1375 va_start(ap2
, pkttype
);
1376 construct_packet(ssh
, pkttype
, ap1
, ap2
);
1380 static int ssh_versioncmp(char *a
, char *b
)
1383 unsigned long av
, bv
;
1385 av
= strtoul(a
, &ae
, 10);
1386 bv
= strtoul(b
, &be
, 10);
1388 return (av
< bv ?
-1 : +1);
1393 av
= strtoul(ae
, &ae
, 10);
1394 bv
= strtoul(be
, &be
, 10);
1396 return (av
< bv ?
-1 : +1);
1401 * Utility routines for putting an SSH-protocol `string' and
1402 * `uint32' into a SHA state.
1405 static void sha_string(SHA_State
* s
, void *str
, int len
)
1407 unsigned char lenblk
[4];
1408 PUT_32BIT(lenblk
, len
);
1409 SHA_Bytes(s
, lenblk
, 4);
1410 SHA_Bytes(s
, str
, len
);
1413 static void sha_uint32(SHA_State
* s
, unsigned i
)
1415 unsigned char intblk
[4];
1416 PUT_32BIT(intblk
, i
);
1417 SHA_Bytes(s
, intblk
, 4);
1421 * SSH2 packet construction functions.
1423 static void ssh2_pkt_ensure(Ssh ssh
, int length
)
1425 if (ssh
->pktout
.maxlen
< length
) {
1426 ssh
->pktout
.maxlen
= length
+ 256;
1427 ssh
->pktout
.data
= sresize(ssh
->pktout
.data
,
1428 ssh
->pktout
.maxlen
+ APIEXTRA
,
1430 if (!ssh
->pktout
.data
)
1431 fatalbox("Out of memory");
1434 static void ssh2_pkt_adddata(Ssh ssh
, void *data
, int len
)
1436 ssh
->pktout
.length
+= len
;
1437 ssh2_pkt_ensure(ssh
, ssh
->pktout
.length
);
1438 memcpy(ssh
->pktout
.data
+ ssh
->pktout
.length
- len
, data
, len
);
1440 static void ssh2_pkt_addbyte(Ssh ssh
, unsigned char byte
)
1442 ssh2_pkt_adddata(ssh
, &byte
, 1);
1444 static void ssh2_pkt_init(Ssh ssh
, int pkt_type
)
1446 ssh
->pktout
.length
= 5;
1447 ssh2_pkt_addbyte(ssh
, (unsigned char) pkt_type
);
1449 static void ssh2_pkt_addbool(Ssh ssh
, unsigned char value
)
1451 ssh2_pkt_adddata(ssh
, &value
, 1);
1453 static void ssh2_pkt_adduint32(Ssh ssh
, unsigned long value
)
1456 PUT_32BIT(x
, value
);
1457 ssh2_pkt_adddata(ssh
, x
, 4);
1459 static void ssh2_pkt_addstring_start(Ssh ssh
)
1461 ssh2_pkt_adduint32(ssh
, 0);
1462 ssh
->pktout
.savedpos
= ssh
->pktout
.length
;
1464 static void ssh2_pkt_addstring_str(Ssh ssh
, char *data
)
1466 ssh2_pkt_adddata(ssh
, data
, strlen(data
));
1467 PUT_32BIT(ssh
->pktout
.data
+ ssh
->pktout
.savedpos
- 4,
1468 ssh
->pktout
.length
- ssh
->pktout
.savedpos
);
1470 static void ssh2_pkt_addstring_data(Ssh ssh
, char *data
, int len
)
1472 ssh2_pkt_adddata(ssh
, data
, len
);
1473 PUT_32BIT(ssh
->pktout
.data
+ ssh
->pktout
.savedpos
- 4,
1474 ssh
->pktout
.length
- ssh
->pktout
.savedpos
);
1476 static void ssh2_pkt_addstring(Ssh ssh
, char *data
)
1478 ssh2_pkt_addstring_start(ssh
);
1479 ssh2_pkt_addstring_str(ssh
, data
);
1481 static unsigned char *ssh2_mpint_fmt(Bignum b
, int *len
)
1484 int i
, n
= (bignum_bitcount(b
) + 7) / 8;
1485 p
= snewn(n
+ 1, unsigned char);
1487 fatalbox("out of memory");
1489 for (i
= 1; i
<= n
; i
++)
1490 p
[i
] = bignum_byte(b
, n
- i
);
1492 while (i
<= n
&& p
[i
] == 0 && (p
[i
+ 1] & 0x80) == 0)
1494 memmove(p
, p
+ i
, n
+ 1 - i
);
1498 static void ssh2_pkt_addmp(Ssh ssh
, Bignum b
)
1502 p
= ssh2_mpint_fmt(b
, &len
);
1503 ssh2_pkt_addstring_start(ssh
);
1504 ssh2_pkt_addstring_data(ssh
, (char *)p
, len
);
1509 * Construct an SSH2 final-form packet: compress it, encrypt it,
1510 * put the MAC on it. Final packet, ready to be sent, is stored in
1511 * ssh->pktout.data. Total length is returned.
1513 static int ssh2_pkt_construct(Ssh ssh
)
1515 int cipherblk
, maclen
, padding
, i
;
1518 log_packet(ssh
->logctx
, PKT_OUTGOING
, ssh
->pktout
.data
[5],
1519 ssh2_pkt_type(ssh
->pkt_ctx
, ssh
->pktout
.data
[5]),
1520 ssh
->pktout
.data
+ 6, ssh
->pktout
.length
- 6);
1523 * Compress packet payload.
1526 unsigned char *newpayload
;
1529 ssh
->cscomp
->compress(ssh
->cs_comp_ctx
, ssh
->pktout
.data
+ 5,
1530 ssh
->pktout
.length
- 5,
1531 &newpayload
, &newlen
)) {
1532 ssh
->pktout
.length
= 5;
1533 ssh2_pkt_adddata(ssh
, newpayload
, newlen
);
1539 * Add padding. At least four bytes, and must also bring total
1540 * length (minus MAC) up to a multiple of the block size.
1542 cipherblk
= ssh
->cscipher ? ssh
->cscipher
->blksize
: 8; /* block size */
1543 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
1546 (cipherblk
- (ssh
->pktout
.length
+ padding
) % cipherblk
) % cipherblk
;
1547 maclen
= ssh
->csmac ? ssh
->csmac
->len
: 0;
1548 ssh2_pkt_ensure(ssh
, ssh
->pktout
.length
+ padding
+ maclen
);
1549 ssh
->pktout
.data
[4] = padding
;
1550 for (i
= 0; i
< padding
; i
++)
1551 ssh
->pktout
.data
[ssh
->pktout
.length
+ i
] = random_byte();
1552 PUT_32BIT(ssh
->pktout
.data
, ssh
->pktout
.length
+ padding
- 4);
1554 ssh
->csmac
->generate(ssh
->cs_mac_ctx
, ssh
->pktout
.data
,
1555 ssh
->pktout
.length
+ padding
,
1556 ssh
->v2_outgoing_sequence
);
1557 ssh
->v2_outgoing_sequence
++; /* whether or not we MACed */
1560 ssh
->cscipher
->encrypt(ssh
->cs_cipher_ctx
,
1561 ssh
->pktout
.data
, ssh
->pktout
.length
+ padding
);
1563 /* Ready-to-send packet starts at ssh->pktout.data. We return length. */
1564 return ssh
->pktout
.length
+ padding
+ maclen
;
1568 * Construct and send an SSH2 packet immediately.
1570 static void ssh2_pkt_send(Ssh ssh
)
1574 len
= ssh2_pkt_construct(ssh
);
1575 backlog
= sk_write(ssh
->s
, (char *)ssh
->pktout
.data
, len
);
1576 if (backlog
> SSH_MAX_BACKLOG
)
1577 ssh_throttle_all(ssh
, 1, backlog
);
1581 * Construct an SSH2 packet and add it to a deferred data block.
1582 * Useful for sending multiple packets in a single sk_write() call,
1583 * to prevent a traffic-analysing listener from being able to work
1584 * out the length of any particular packet (such as the password
1587 * Note that because SSH2 sequence-numbers its packets, this can
1588 * NOT be used as an m4-style `defer' allowing packets to be
1589 * constructed in one order and sent in another.
1591 static void ssh2_pkt_defer(Ssh ssh
)
1593 int len
= ssh2_pkt_construct(ssh
);
1594 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1595 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1596 ssh
->deferred_send_data
= sresize(ssh
->deferred_send_data
,
1600 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, ssh
->pktout
.data
, len
);
1601 ssh
->deferred_len
+= len
;
1605 * Send the whole deferred data block constructed by
1606 * ssh2_pkt_defer() or SSH1's defer_packet().
1608 static void ssh_pkt_defersend(Ssh ssh
)
1611 backlog
= sk_write(ssh
->s
, (char *)ssh
->deferred_send_data
,
1613 ssh
->deferred_len
= ssh
->deferred_size
= 0;
1614 sfree(ssh
->deferred_send_data
);
1615 ssh
->deferred_send_data
= NULL
;
1616 if (backlog
> SSH_MAX_BACKLOG
)
1617 ssh_throttle_all(ssh
, 1, backlog
);
1621 void bndebug(char *string
, Bignum b
)
1625 p
= ssh2_mpint_fmt(b
, &len
);
1626 debug(("%s", string
));
1627 for (i
= 0; i
< len
; i
++)
1628 debug((" %02x", p
[i
]));
1634 static void sha_mpint(SHA_State
* s
, Bignum b
)
1638 p
= ssh2_mpint_fmt(b
, &len
);
1639 sha_string(s
, p
, len
);
1644 * Packet decode functions for both SSH1 and SSH2.
1646 static unsigned long ssh_pkt_getuint32(Ssh ssh
)
1648 unsigned long value
;
1649 if (ssh
->pktin
.length
- ssh
->pktin
.savedpos
< 4)
1650 return 0; /* arrgh, no way to decline (FIXME?) */
1651 value
= GET_32BIT(ssh
->pktin
.body
+ ssh
->pktin
.savedpos
);
1652 ssh
->pktin
.savedpos
+= 4;
1655 static int ssh2_pkt_getbool(Ssh ssh
)
1657 unsigned long value
;
1658 if (ssh
->pktin
.length
- ssh
->pktin
.savedpos
< 1)
1659 return 0; /* arrgh, no way to decline (FIXME?) */
1660 value
= ssh
->pktin
.body
[ssh
->pktin
.savedpos
] != 0;
1661 ssh
->pktin
.savedpos
++;
1664 static void ssh_pkt_getstring(Ssh ssh
, char **p
, int *length
)
1669 if (ssh
->pktin
.length
- ssh
->pktin
.savedpos
< 4)
1671 len
= GET_32BIT(ssh
->pktin
.body
+ ssh
->pktin
.savedpos
);
1675 ssh
->pktin
.savedpos
+= 4;
1676 if (ssh
->pktin
.length
- ssh
->pktin
.savedpos
< *length
)
1678 *p
= (char *)(ssh
->pktin
.body
+ ssh
->pktin
.savedpos
);
1679 ssh
->pktin
.savedpos
+= *length
;
1681 static void *ssh_pkt_getdata(Ssh ssh
, int length
)
1683 if (ssh
->pktin
.length
- ssh
->pktin
.savedpos
< length
)
1685 ssh
->pktin
.savedpos
+= length
;
1686 return ssh
->pktin
.body
+ (ssh
->pktin
.savedpos
- length
);
1688 static int ssh1_pkt_getrsakey(Ssh ssh
, struct RSAKey
*key
,
1689 unsigned char **keystr
)
1693 j
= makekey(ssh
->pktin
.body
+ ssh
->pktin
.savedpos
,
1694 ssh
->pktin
.length
- ssh
->pktin
.savedpos
,
1700 ssh
->pktin
.savedpos
+= j
;
1701 assert(ssh
->pktin
.savedpos
< ssh
->pktin
.length
);
1705 static Bignum
ssh1_pkt_getmp(Ssh ssh
)
1710 j
= ssh1_read_bignum(ssh
->pktin
.body
+ ssh
->pktin
.savedpos
,
1711 ssh
->pktin
.length
- ssh
->pktin
.savedpos
, &b
);
1716 ssh
->pktin
.savedpos
+= j
;
1719 static Bignum
ssh2_pkt_getmp(Ssh ssh
)
1725 ssh_pkt_getstring(ssh
, &p
, &length
);
1729 bombout(("internal error: Can't handle negative mpints"));
1732 b
= bignum_from_bytes((unsigned char *)p
, length
);
1737 * Helper function to add an SSH2 signature blob to a packet.
1738 * Expects to be shown the public key blob as well as the signature
1739 * blob. Normally works just like ssh2_pkt_addstring, but will
1740 * fiddle with the signature packet if necessary for
1741 * BUG_SSH2_RSA_PADDING.
1743 static void ssh2_add_sigblob(Ssh ssh
, void *pkblob_v
, int pkblob_len
,
1744 void *sigblob_v
, int sigblob_len
)
1746 unsigned char *pkblob
= (unsigned char *)pkblob_v
;
1747 unsigned char *sigblob
= (unsigned char *)sigblob_v
;
1749 /* dmemdump(pkblob, pkblob_len); */
1750 /* dmemdump(sigblob, sigblob_len); */
1753 * See if this is in fact an ssh-rsa signature and a buggy
1754 * server; otherwise we can just do this the easy way.
1756 if ((ssh
->remote_bugs
& BUG_SSH2_RSA_PADDING
) &&
1757 (GET_32BIT(pkblob
) == 7 && !memcmp(pkblob
+4, "ssh-rsa", 7))) {
1758 int pos
, len
, siglen
;
1761 * Find the byte length of the modulus.
1764 pos
= 4+7; /* skip over "ssh-rsa" */
1765 pos
+= 4 + GET_32BIT(pkblob
+pos
); /* skip over exponent */
1766 len
= GET_32BIT(pkblob
+pos
); /* find length of modulus */
1767 pos
+= 4; /* find modulus itself */
1768 while (len
> 0 && pkblob
[pos
] == 0)
1770 /* debug(("modulus length is %d\n", len)); */
1773 * Now find the signature integer.
1775 pos
= 4+7; /* skip over "ssh-rsa" */
1776 siglen
= GET_32BIT(sigblob
+pos
);
1777 /* debug(("signature length is %d\n", siglen)); */
1779 if (len
!= siglen
) {
1780 unsigned char newlen
[4];
1781 ssh2_pkt_addstring_start(ssh
);
1782 ssh2_pkt_addstring_data(ssh
, (char *)sigblob
, pos
);
1783 /* dmemdump(sigblob, pos); */
1784 pos
+= 4; /* point to start of actual sig */
1785 PUT_32BIT(newlen
, len
);
1786 ssh2_pkt_addstring_data(ssh
, (char *)newlen
, 4);
1787 /* dmemdump(newlen, 4); */
1789 while (len
-- > siglen
) {
1790 ssh2_pkt_addstring_data(ssh
, (char *)newlen
, 1);
1791 /* dmemdump(newlen, 1); */
1793 ssh2_pkt_addstring_data(ssh
, (char *)(sigblob
+pos
), siglen
);
1794 /* dmemdump(sigblob+pos, siglen); */
1798 /* Otherwise fall through and do it the easy way. */
1801 ssh2_pkt_addstring_start(ssh
);
1802 ssh2_pkt_addstring_data(ssh
, (char *)sigblob
, sigblob_len
);
1806 * Examine the remote side's version string and compare it against
1807 * a list of known buggy implementations.
1809 static void ssh_detect_bugs(Ssh ssh
, char *vstring
)
1811 char *imp
; /* pointer to implementation part */
1813 imp
+= strcspn(imp
, "-");
1815 imp
+= strcspn(imp
, "-");
1818 ssh
->remote_bugs
= 0;
1820 if (ssh
->cfg
.sshbug_ignore1
== FORCE_ON
||
1821 (ssh
->cfg
.sshbug_ignore1
== AUTO
&&
1822 (!strcmp(imp
, "1.2.18") || !strcmp(imp
, "1.2.19") ||
1823 !strcmp(imp
, "1.2.20") || !strcmp(imp
, "1.2.21") ||
1824 !strcmp(imp
, "1.2.22") || !strcmp(imp
, "Cisco-1.25") ||
1825 !strcmp(imp
, "OSU_1.4alpha3")))) {
1827 * These versions don't support SSH1_MSG_IGNORE, so we have
1828 * to use a different defence against password length
1831 ssh
->remote_bugs
|= BUG_CHOKES_ON_SSH1_IGNORE
;
1832 logevent("We believe remote version has SSH1 ignore bug");
1835 if (ssh
->cfg
.sshbug_plainpw1
== FORCE_ON
||
1836 (ssh
->cfg
.sshbug_plainpw1
== AUTO
&&
1837 (!strcmp(imp
, "Cisco-1.25") || !strcmp(imp
, "OSU_1.4alpha3")))) {
1839 * These versions need a plain password sent; they can't
1840 * handle having a null and a random length of data after
1843 ssh
->remote_bugs
|= BUG_NEEDS_SSH1_PLAIN_PASSWORD
;
1844 logevent("We believe remote version needs a plain SSH1 password");
1847 if (ssh
->cfg
.sshbug_rsa1
== FORCE_ON
||
1848 (ssh
->cfg
.sshbug_rsa1
== AUTO
&&
1849 (!strcmp(imp
, "Cisco-1.25")))) {
1851 * These versions apparently have no clue whatever about
1852 * RSA authentication and will panic and die if they see
1853 * an AUTH_RSA message.
1855 ssh
->remote_bugs
|= BUG_CHOKES_ON_RSA
;
1856 logevent("We believe remote version can't handle RSA authentication");
1859 if (ssh
->cfg
.sshbug_hmac2
== FORCE_ON
||
1860 (ssh
->cfg
.sshbug_hmac2
== AUTO
&&
1861 !wc_match("* VShell", imp
) &&
1862 (wc_match("2.1.0*", imp
) || wc_match("2.0.*", imp
) ||
1863 wc_match("2.2.0*", imp
) || wc_match("2.3.0*", imp
) ||
1864 wc_match("2.1 *", imp
)))) {
1866 * These versions have the HMAC bug.
1868 ssh
->remote_bugs
|= BUG_SSH2_HMAC
;
1869 logevent("We believe remote version has SSH2 HMAC bug");
1872 if (ssh
->cfg
.sshbug_derivekey2
== FORCE_ON
||
1873 (ssh
->cfg
.sshbug_derivekey2
== AUTO
&&
1874 !wc_match("* VShell", imp
) &&
1875 (wc_match("2.0.0*", imp
) || wc_match("2.0.10*", imp
) ))) {
1877 * These versions have the key-derivation bug (failing to
1878 * include the literal shared secret in the hashes that
1879 * generate the keys).
1881 ssh
->remote_bugs
|= BUG_SSH2_DERIVEKEY
;
1882 logevent("We believe remote version has SSH2 key-derivation bug");
1885 if (ssh
->cfg
.sshbug_rsapad2
== FORCE_ON
||
1886 (ssh
->cfg
.sshbug_rsapad2
== AUTO
&&
1887 (wc_match("OpenSSH_2.[5-9]*", imp
) ||
1888 wc_match("OpenSSH_3.[0-2]*", imp
)))) {
1890 * These versions have the SSH2 RSA padding bug.
1892 ssh
->remote_bugs
|= BUG_SSH2_RSA_PADDING
;
1893 logevent("We believe remote version has SSH2 RSA padding bug");
1896 if (ssh
->cfg
.sshbug_pksessid2
== FORCE_ON
||
1897 (ssh
->cfg
.sshbug_pksessid2
== AUTO
&&
1898 wc_match("OpenSSH_2.[0-2]*", imp
))) {
1900 * These versions have the SSH2 session-ID bug in
1901 * public-key authentication.
1903 ssh
->remote_bugs
|= BUG_SSH2_PK_SESSIONID
;
1904 logevent("We believe remote version has SSH2 public-key-session-ID bug");
1907 if (ssh
->cfg
.sshbug_dhgex2
== FORCE_ON
) {
1909 * User specified the SSH2 DH GEX bug.
1911 ssh
->remote_bugs
|= BUG_SSH2_DH_GEX
;
1912 logevent("We believe remote version has SSH2 DH group exchange bug");
1916 static int do_ssh_init(Ssh ssh
, unsigned char c
)
1918 struct do_ssh_init_state
{
1926 crState(do_ssh_init_state
);
1928 crBegin(ssh
->do_ssh_init_crstate
);
1930 /* Search for the string "SSH-" in the input. */
1933 static const int transS
[] = { 1, 2, 2, 1 };
1934 static const int transH
[] = { 0, 0, 3, 0 };
1935 static const int transminus
[] = { 0, 0, 0, -1 };
1937 s
->i
= transS
[s
->i
];
1939 s
->i
= transH
[s
->i
];
1941 s
->i
= transminus
[s
->i
];
1946 crReturn(1); /* get another character */
1950 s
->vstring
= snewn(s
->vstrsize
, char);
1951 strcpy(s
->vstring
, "SSH-");
1955 crReturn(1); /* get another char */
1956 if (s
->vslen
>= s
->vstrsize
- 1) {
1958 s
->vstring
= sresize(s
->vstring
, s
->vstrsize
, char);
1960 s
->vstring
[s
->vslen
++] = c
;
1963 s
->version
[s
->i
] = '\0';
1965 } else if (s
->i
< sizeof(s
->version
) - 1)
1966 s
->version
[s
->i
++] = c
;
1967 } else if (c
== '\012')
1971 ssh
->agentfwd_enabled
= FALSE
;
1972 ssh
->rdpkt2_state
.incoming_sequence
= 0;
1974 s
->vstring
[s
->vslen
] = 0;
1975 s
->vstring
[strcspn(s
->vstring
, "\r\n")] = '\0';/* remove EOL chars */
1978 vlog
= snewn(20 + s
->vslen
, char);
1979 sprintf(vlog
, "Server version: %s", s
->vstring
);
1983 ssh_detect_bugs(ssh
, s
->vstring
);
1986 * Decide which SSH protocol version to support.
1989 /* Anything strictly below "2.0" means protocol 1 is supported. */
1990 s
->proto1
= ssh_versioncmp(s
->version
, "2.0") < 0;
1991 /* Anything greater or equal to "1.99" means protocol 2 is supported. */
1992 s
->proto2
= ssh_versioncmp(s
->version
, "1.99") >= 0;
1994 if (ssh
->cfg
.sshprot
== 0 && !s
->proto1
) {
1995 bombout(("SSH protocol version 1 required by user but not provided by server"));
1998 if (ssh
->cfg
.sshprot
== 3 && !s
->proto2
) {
1999 bombout(("SSH protocol version 2 required by user but not provided by server"));
2003 if (s
->proto2
&& (ssh
->cfg
.sshprot
>= 2 || !s
->proto1
)) {
2007 char verstring
[80], vlog
[100];
2008 sprintf(verstring
, "SSH-2.0-%s", sshver
);
2009 SHA_Init(&ssh
->exhashbase
);
2011 * Hash our version string and their version string.
2013 sha_string(&ssh
->exhashbase
, verstring
, strlen(verstring
));
2014 sha_string(&ssh
->exhashbase
, s
->vstring
, strcspn(s
->vstring
, "\r\n"));
2015 sprintf(vlog
, "We claim version: %s", verstring
);
2017 strcat(verstring
, "\012");
2018 logevent("Using SSH protocol version 2");
2019 sk_write(ssh
->s
, verstring
, strlen(verstring
));
2020 ssh
->protocol
= ssh2_protocol
;
2022 ssh
->s_rdpkt
= ssh2_rdpkt
;
2027 char verstring
[80], vlog
[100];
2028 sprintf(verstring
, "SSH-%s-%s",
2029 (ssh_versioncmp(s
->version
, "1.5") <= 0 ? s
->version
: "1.5"),
2031 sprintf(vlog
, "We claim version: %s", verstring
);
2033 strcat(verstring
, "\012");
2035 logevent("Using SSH protocol version 1");
2036 sk_write(ssh
->s
, verstring
, strlen(verstring
));
2037 ssh
->protocol
= ssh1_protocol
;
2039 ssh
->s_rdpkt
= ssh1_rdpkt
;
2041 update_specials_menu(ssh
->frontend
);
2042 ssh
->state
= SSH_STATE_BEFORE_SIZE
;
2049 static void ssh_gotdata(Ssh ssh
, unsigned char *data
, int datalen
)
2051 crBegin(ssh
->ssh_gotdata_crstate
);
2054 * To begin with, feed the characters one by one to the
2055 * protocol initialisation / selection function do_ssh_init().
2056 * When that returns 0, we're done with the initial greeting
2057 * exchange and can move on to packet discipline.
2060 int ret
; /* need not be kept across crReturn */
2062 crReturnV
; /* more data please */
2063 ret
= do_ssh_init(ssh
, *data
);
2071 * We emerge from that loop when the initial negotiation is
2072 * over and we have selected an s_rdpkt function. Now pass
2073 * everything to s_rdpkt, and then pass the resulting packets
2074 * to the proper protocol handler.
2079 while (datalen
> 0) {
2080 if (ssh
->s_rdpkt(ssh
, &data
, &datalen
) == 0) {
2081 if (ssh
->state
== SSH_STATE_CLOSED
) {
2084 ssh
->protocol(ssh
, NULL
, 0, 1);
2085 if (ssh
->state
== SSH_STATE_CLOSED
) {
2095 static void ssh_do_close(Ssh ssh
)
2098 struct ssh_channel
*c
;
2100 ssh
->state
= SSH_STATE_CLOSED
;
2106 * Now we must shut down any port and X forwardings going
2107 * through this connection.
2109 if (ssh
->channels
) {
2110 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
2113 x11_close(c
->u
.x11
.s
);
2116 pfd_close(c
->u
.pfd
.s
);
2119 del234(ssh
->channels
, c
);
2120 if (ssh
->version
== 2)
2121 bufchain_clear(&c
->v
.v2
.outbuffer
);
2127 static int ssh_closing(Plug plug
, const char *error_msg
, int error_code
,
2130 Ssh ssh
= (Ssh
) plug
;
2133 /* A socket error has occurred. */
2134 logevent(error_msg
);
2135 connection_fatal(ssh
->frontend
, "%s", error_msg
);
2137 /* Otherwise, the remote side closed the connection normally. */
2142 static int ssh_receive(Plug plug
, int urgent
, char *data
, int len
)
2144 Ssh ssh
= (Ssh
) plug
;
2145 ssh_gotdata(ssh
, (unsigned char *)data
, len
);
2146 if (ssh
->state
== SSH_STATE_CLOSED
) {
2153 static void ssh_sent(Plug plug
, int bufsize
)
2155 Ssh ssh
= (Ssh
) plug
;
2157 * If the send backlog on the SSH socket itself clears, we
2158 * should unthrottle the whole world if it was throttled.
2160 if (bufsize
< SSH_MAX_BACKLOG
)
2161 ssh_throttle_all(ssh
, 0, bufsize
);
2165 * Connect to specified host and port.
2166 * Returns an error message, or NULL on success.
2167 * Also places the canonical host name into `realhost'. It must be
2168 * freed by the caller.
2170 static const char *connect_to_host(Ssh ssh
, char *host
, int port
,
2171 char **realhost
, int nodelay
, int keepalive
)
2173 static const struct plug_function_table fn_table
= {
2183 ssh
->savedhost
= snewn(1 + strlen(host
), char);
2184 if (!ssh
->savedhost
)
2185 fatalbox("Out of memory");
2186 strcpy(ssh
->savedhost
, host
);
2189 port
= 22; /* default ssh port */
2190 ssh
->savedport
= port
;
2195 logeventf(ssh
, "Looking up host \"%s\"", host
);
2196 addr
= name_lookup(host
, port
, realhost
, &ssh
->cfg
);
2197 if ((err
= sk_addr_error(addr
)) != NULL
) {
2207 sk_getaddr(addr
, addrbuf
, 100);
2208 logeventf(ssh
, "Connecting to %s port %d", addrbuf
, port
);
2210 ssh
->fn
= &fn_table
;
2211 ssh
->s
= new_connection(addr
, *realhost
, port
,
2212 0, 1, nodelay
, keepalive
, (Plug
) ssh
, &ssh
->cfg
);
2213 if ((err
= sk_socket_error(ssh
->s
)) != NULL
) {
2222 * Throttle or unthrottle the SSH connection.
2224 static void ssh1_throttle(Ssh ssh
, int adjust
)
2226 int old_count
= ssh
->v1_throttle_count
;
2227 ssh
->v1_throttle_count
+= adjust
;
2228 assert(ssh
->v1_throttle_count
>= 0);
2229 if (ssh
->v1_throttle_count
&& !old_count
) {
2230 sk_set_frozen(ssh
->s
, 1);
2231 } else if (!ssh
->v1_throttle_count
&& old_count
) {
2232 sk_set_frozen(ssh
->s
, 0);
2237 * Throttle or unthrottle _all_ local data streams (for when sends
2238 * on the SSH connection itself back up).
2240 static void ssh_throttle_all(Ssh ssh
, int enable
, int bufsize
)
2243 struct ssh_channel
*c
;
2245 if (enable
== ssh
->throttled_all
)
2247 ssh
->throttled_all
= enable
;
2248 ssh
->overall_bufsize
= bufsize
;
2251 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
2253 case CHAN_MAINSESSION
:
2255 * This is treated separately, outside the switch.
2259 x11_override_throttle(c
->u
.x11
.s
, enable
);
2262 /* Agent channels require no buffer management. */
2265 pfd_override_throttle(c
->u
.pfd
.s
, enable
);
2272 * Username and password input, abstracted off into routines
2273 * reusable in several places - even between SSH1 and SSH2.
2276 /* Set up a username or password input loop on a given buffer. */
2277 static void setup_userpass_input(Ssh ssh
, char *buffer
, int buflen
, int echo
)
2279 ssh
->userpass_input_buffer
= buffer
;
2280 ssh
->userpass_input_buflen
= buflen
;
2281 ssh
->userpass_input_bufpos
= 0;
2282 ssh
->userpass_input_echo
= echo
;
2286 * Process some terminal data in the course of username/password
2287 * input. Returns >0 for success (line of input returned in
2288 * buffer), <0 for failure (user hit ^C/^D, bomb out and exit), 0
2289 * for inconclusive (keep waiting for more input please).
2291 static int process_userpass_input(Ssh ssh
, unsigned char *in
, int inlen
)
2296 switch (c
= *in
++) {
2299 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
] = 0;
2300 ssh
->userpass_input_buffer
[ssh
->userpass_input_buflen
-1] = 0;
2305 if (ssh
->userpass_input_bufpos
> 0) {
2306 if (ssh
->userpass_input_echo
)
2307 c_write_str(ssh
, "\b \b");
2308 ssh
->userpass_input_bufpos
--;
2313 while (ssh
->userpass_input_bufpos
> 0) {
2314 if (ssh
->userpass_input_echo
)
2315 c_write_str(ssh
, "\b \b");
2316 ssh
->userpass_input_bufpos
--;
2325 * This simplistic check for printability is disabled
2326 * when we're doing password input, because some people
2327 * have control characters in their passwords.o
2329 if ((!ssh
->userpass_input_echo
||
2330 (c
>= ' ' && c
<= '~') ||
2331 ((unsigned char) c
>= 160))
2332 && ssh
->userpass_input_bufpos
< ssh
->userpass_input_buflen
-1) {
2333 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
++] = c
;
2334 if (ssh
->userpass_input_echo
)
2335 c_write(ssh
, &c
, 1);
2343 static void ssh_agent_callback(void *sshv
, void *reply
, int replylen
)
2345 Ssh ssh
= (Ssh
) sshv
;
2347 ssh
->agent_response
= reply
;
2348 ssh
->agent_response_len
= replylen
;
2350 if (ssh
->version
== 1)
2351 do_ssh1_login(ssh
, NULL
, -1, 0);
2353 do_ssh2_authconn(ssh
, NULL
, -1, 0);
2356 static void ssh_agentf_callback(void *cv
, void *reply
, int replylen
)
2358 struct ssh_channel
*c
= (struct ssh_channel
*)cv
;
2360 void *sentreply
= reply
;
2363 /* Fake SSH_AGENT_FAILURE. */
2364 sentreply
= "\0\0\0\1\5";
2367 if (ssh
->version
== 2) {
2368 ssh2_add_channel_data(c
, sentreply
, replylen
);
2371 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
2372 PKT_INT
, c
->remoteid
,
2374 PKT_DATA
, sentreply
, replylen
,
2382 * Handle the key exchange and user authentication phases.
2384 static int do_ssh1_login(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
2387 unsigned char cookie
[8], *ptr
;
2388 struct RSAKey servkey
, hostkey
;
2389 struct MD5Context md5c
;
2390 struct do_ssh1_login_state
{
2392 unsigned char *rsabuf
, *keystr1
, *keystr2
;
2393 unsigned long supported_ciphers_mask
, supported_auths_mask
;
2394 int tried_publickey
, tried_agent
;
2395 int tis_auth_refused
, ccard_auth_refused
;
2396 unsigned char session_id
[16];
2399 void *publickey_blob
;
2400 int publickey_bloblen
;
2406 unsigned char request
[5], *response
, *p
;
2415 crState(do_ssh1_login_state
);
2417 crBegin(ssh
->do_ssh1_login_crstate
);
2422 if (ssh
->pktin
.type
!= SSH1_SMSG_PUBLIC_KEY
) {
2423 bombout(("Public key packet not received"));
2427 logevent("Received public keys");
2429 ptr
= ssh_pkt_getdata(ssh
, 8);
2431 bombout(("SSH1 public key packet stopped before random cookie"));
2434 memcpy(cookie
, ptr
, 8);
2436 if (!ssh1_pkt_getrsakey(ssh
, &servkey
, &s
->keystr1
) ||
2437 !ssh1_pkt_getrsakey(ssh
, &hostkey
, &s
->keystr2
)) {
2438 bombout(("SSH1 public key packet stopped before public keys"));
2443 * Log the host key fingerprint.
2447 logevent("Host key fingerprint is:");
2448 strcpy(logmsg
, " ");
2449 hostkey
.comment
= NULL
;
2450 rsa_fingerprint(logmsg
+ strlen(logmsg
),
2451 sizeof(logmsg
) - strlen(logmsg
), &hostkey
);
2455 ssh
->v1_remote_protoflags
= ssh_pkt_getuint32(ssh
);
2456 s
->supported_ciphers_mask
= ssh_pkt_getuint32(ssh
);
2457 s
->supported_auths_mask
= ssh_pkt_getuint32(ssh
);
2459 ssh
->v1_local_protoflags
=
2460 ssh
->v1_remote_protoflags
& SSH1_PROTOFLAGS_SUPPORTED
;
2461 ssh
->v1_local_protoflags
|= SSH1_PROTOFLAG_SCREEN_NUMBER
;
2464 MD5Update(&md5c
, s
->keystr2
, hostkey
.bytes
);
2465 MD5Update(&md5c
, s
->keystr1
, servkey
.bytes
);
2466 MD5Update(&md5c
, cookie
, 8);
2467 MD5Final(s
->session_id
, &md5c
);
2469 for (i
= 0; i
< 32; i
++)
2470 ssh
->session_key
[i
] = random_byte();
2473 * Verify that the `bits' and `bytes' parameters match.
2475 if (hostkey
.bits
> hostkey
.bytes
* 8 ||
2476 servkey
.bits
> servkey
.bytes
* 8) {
2477 bombout(("SSH1 public keys were badly formatted"));
2481 s
->len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
2483 s
->rsabuf
= snewn(s
->len
, unsigned char);
2485 fatalbox("Out of memory");
2488 * Verify the host key.
2492 * First format the key into a string.
2494 int len
= rsastr_len(&hostkey
);
2495 char fingerprint
[100];
2496 char *keystr
= snewn(len
, char);
2498 fatalbox("Out of memory");
2499 rsastr_fmt(keystr
, &hostkey
);
2500 rsa_fingerprint(fingerprint
, sizeof(fingerprint
), &hostkey
);
2501 verify_ssh_host_key(ssh
->frontend
,
2502 ssh
->savedhost
, ssh
->savedport
, "rsa", keystr
,
2507 for (i
= 0; i
< 32; i
++) {
2508 s
->rsabuf
[i
] = ssh
->session_key
[i
];
2510 s
->rsabuf
[i
] ^= s
->session_id
[i
];
2513 if (hostkey
.bytes
> servkey
.bytes
) {
2514 ret
= rsaencrypt(s
->rsabuf
, 32, &servkey
);
2516 ret
= rsaencrypt(s
->rsabuf
, servkey
.bytes
, &hostkey
);
2518 ret
= rsaencrypt(s
->rsabuf
, 32, &hostkey
);
2520 ret
= rsaencrypt(s
->rsabuf
, hostkey
.bytes
, &servkey
);
2523 bombout(("SSH1 public key encryptions failed due to bad formatting"));
2527 logevent("Encrypted session key");
2530 int cipher_chosen
= 0, warn
= 0;
2531 char *cipher_string
= NULL
;
2533 for (i
= 0; !cipher_chosen
&& i
< CIPHER_MAX
; i
++) {
2534 int next_cipher
= ssh
->cfg
.ssh_cipherlist
[i
];
2535 if (next_cipher
== CIPHER_WARN
) {
2536 /* If/when we choose a cipher, warn about it */
2538 } else if (next_cipher
== CIPHER_AES
) {
2539 /* XXX Probably don't need to mention this. */
2540 logevent("AES not supported in SSH1, skipping");
2542 switch (next_cipher
) {
2543 case CIPHER_3DES
: s
->cipher_type
= SSH_CIPHER_3DES
;
2544 cipher_string
= "3DES"; break;
2545 case CIPHER_BLOWFISH
: s
->cipher_type
= SSH_CIPHER_BLOWFISH
;
2546 cipher_string
= "Blowfish"; break;
2547 case CIPHER_DES
: s
->cipher_type
= SSH_CIPHER_DES
;
2548 cipher_string
= "single-DES"; break;
2550 if (s
->supported_ciphers_mask
& (1 << s
->cipher_type
))
2554 if (!cipher_chosen
) {
2555 if ((s
->supported_ciphers_mask
& (1 << SSH_CIPHER_3DES
)) == 0)
2556 bombout(("Server violates SSH 1 protocol by not "
2557 "supporting 3DES encryption"));
2559 /* shouldn't happen */
2560 bombout(("No supported ciphers found"));
2564 /* Warn about chosen cipher if necessary. */
2566 askcipher(ssh
->frontend
, cipher_string
, 0);
2569 switch (s
->cipher_type
) {
2570 case SSH_CIPHER_3DES
:
2571 logevent("Using 3DES encryption");
2573 case SSH_CIPHER_DES
:
2574 logevent("Using single-DES encryption");
2576 case SSH_CIPHER_BLOWFISH
:
2577 logevent("Using Blowfish encryption");
2581 send_packet(ssh
, SSH1_CMSG_SESSION_KEY
,
2582 PKT_CHAR
, s
->cipher_type
,
2583 PKT_DATA
, cookie
, 8,
2584 PKT_CHAR
, (s
->len
* 8) >> 8, PKT_CHAR
, (s
->len
* 8) & 0xFF,
2585 PKT_DATA
, s
->rsabuf
, s
->len
,
2586 PKT_INT
, ssh
->v1_local_protoflags
, PKT_END
);
2588 logevent("Trying to enable encryption...");
2592 ssh
->cipher
= (s
->cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish_ssh1
:
2593 s
->cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
2595 ssh
->v1_cipher_ctx
= ssh
->cipher
->make_context();
2596 ssh
->cipher
->sesskey(ssh
->v1_cipher_ctx
, ssh
->session_key
);
2597 logeventf(ssh
, "Initialised %s encryption", ssh
->cipher
->text_name
);
2599 ssh
->crcda_ctx
= crcda_make_context();
2600 logevent("Installing CRC compensation attack detector");
2602 if (servkey
.modulus
) {
2603 sfree(servkey
.modulus
);
2604 servkey
.modulus
= NULL
;
2606 if (servkey
.exponent
) {
2607 sfree(servkey
.exponent
);
2608 servkey
.exponent
= NULL
;
2610 if (hostkey
.modulus
) {
2611 sfree(hostkey
.modulus
);
2612 hostkey
.modulus
= NULL
;
2614 if (hostkey
.exponent
) {
2615 sfree(hostkey
.exponent
);
2616 hostkey
.exponent
= NULL
;
2620 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
) {
2621 bombout(("Encryption not successfully enabled"));
2625 logevent("Successfully started encryption");
2629 if ((flags
& FLAG_INTERACTIVE
) && !*ssh
->cfg
.username
) {
2630 if (ssh_get_line
&& !ssh_getline_pw_only
) {
2631 if (!ssh_get_line("login as: ",
2632 s
->username
, sizeof(s
->username
), FALSE
)) {
2634 * get_line failed to get a username.
2637 logevent("No username provided. Abandoning session.");
2638 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
2642 int ret
; /* need not be kept over crReturn */
2643 c_write_str(ssh
, "login as: ");
2646 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
2648 crWaitUntil(!ispkt
);
2649 ret
= process_userpass_input(ssh
, in
, inlen
);
2653 c_write_str(ssh
, "\r\n");
2656 strncpy(s
->username
, ssh
->cfg
.username
, sizeof(s
->username
));
2657 s
->username
[sizeof(s
->username
)-1] = '\0';
2660 send_packet(ssh
, SSH1_CMSG_USER
, PKT_STR
, s
->username
, PKT_END
);
2662 char userlog
[22 + sizeof(s
->username
)];
2663 sprintf(userlog
, "Sent username \"%s\"", s
->username
);
2665 if (flags
& FLAG_INTERACTIVE
&&
2666 (!((flags
& FLAG_STDERR
) && (flags
& FLAG_VERBOSE
)))) {
2667 strcat(userlog
, "\r\n");
2668 c_write_str(ssh
, userlog
);
2675 if ((ssh
->remote_bugs
& BUG_CHOKES_ON_RSA
)) {
2676 /* We must not attempt PK auth. Pretend we've already tried it. */
2677 s
->tried_publickey
= s
->tried_agent
= 1;
2679 s
->tried_publickey
= s
->tried_agent
= 0;
2681 s
->tis_auth_refused
= s
->ccard_auth_refused
= 0;
2682 /* Load the public half of ssh->cfg.keyfile so we notice if it's in Pageant */
2683 if (!filename_is_null(ssh
->cfg
.keyfile
)) {
2684 if (!rsakey_pubblob(&ssh
->cfg
.keyfile
,
2685 &s
->publickey_blob
, &s
->publickey_bloblen
, NULL
))
2686 s
->publickey_blob
= NULL
;
2688 s
->publickey_blob
= NULL
;
2690 while (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
2691 s
->pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
2693 if (agent_exists() && !s
->tried_agent
) {
2695 * Attempt RSA authentication using Pageant.
2701 logevent("Pageant is running. Requesting keys.");
2703 /* Request the keys held by the agent. */
2704 PUT_32BIT(s
->request
, 1);
2705 s
->request
[4] = SSH1_AGENTC_REQUEST_RSA_IDENTITIES
;
2706 if (!agent_query(s
->request
, 5, &r
, &s
->responselen
,
2707 ssh_agent_callback
, ssh
)) {
2711 bombout(("Unexpected data from server while waiting"
2712 " for agent response"));
2715 } while (ispkt
|| inlen
> 0);
2716 r
= ssh
->agent_response
;
2717 s
->responselen
= ssh
->agent_response_len
;
2719 s
->response
= (unsigned char *) r
;
2720 if (s
->response
&& s
->responselen
>= 5 &&
2721 s
->response
[4] == SSH1_AGENT_RSA_IDENTITIES_ANSWER
) {
2722 s
->p
= s
->response
+ 5;
2723 s
->nkeys
= GET_32BIT(s
->p
);
2727 sprintf(buf
, "Pageant has %d SSH1 keys", s
->nkeys
);
2730 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
2733 sprintf(buf
, "Trying Pageant key #%d", s
->keyi
);
2736 if (s
->publickey_blob
&&
2737 !memcmp(s
->p
, s
->publickey_blob
,
2738 s
->publickey_bloblen
)) {
2739 logevent("This key matches configured key file");
2740 s
->tried_publickey
= 1;
2745 do { /* do while (0) to make breaking easy */
2746 n
= ssh1_read_bignum
2747 (s
->p
, s
->responselen
-(s
->p
-s
->response
),
2752 n
= ssh1_read_bignum
2753 (s
->p
, s
->responselen
-(s
->p
-s
->response
),
2758 if (s
->responselen
- (s
->p
-s
->response
) < 4)
2760 s
->commentlen
= GET_32BIT(s
->p
);
2762 if (s
->responselen
- (s
->p
-s
->response
) <
2765 s
->commentp
= (char *)s
->p
;
2766 s
->p
+= s
->commentlen
;
2770 logevent("Pageant key list packet was truncated");
2774 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
2775 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
2777 if (ssh
->pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
2778 logevent("Key refused");
2781 logevent("Received RSA challenge");
2782 if ((s
->challenge
= ssh1_pkt_getmp(ssh
)) == NULL
) {
2783 bombout(("Server's RSA challenge was badly formatted"));
2788 char *agentreq
, *q
, *ret
;
2791 len
= 1 + 4; /* message type, bit count */
2792 len
+= ssh1_bignum_length(s
->key
.exponent
);
2793 len
+= ssh1_bignum_length(s
->key
.modulus
);
2794 len
+= ssh1_bignum_length(s
->challenge
);
2795 len
+= 16; /* session id */
2796 len
+= 4; /* response format */
2797 agentreq
= snewn(4 + len
, char);
2798 PUT_32BIT(agentreq
, len
);
2800 *q
++ = SSH1_AGENTC_RSA_CHALLENGE
;
2801 PUT_32BIT(q
, bignum_bitcount(s
->key
.modulus
));
2803 q
+= ssh1_write_bignum(q
, s
->key
.exponent
);
2804 q
+= ssh1_write_bignum(q
, s
->key
.modulus
);
2805 q
+= ssh1_write_bignum(q
, s
->challenge
);
2806 memcpy(q
, s
->session_id
, 16);
2808 PUT_32BIT(q
, 1); /* response format */
2809 if (!agent_query(agentreq
, len
+ 4, &vret
, &retlen
,
2810 ssh_agent_callback
, ssh
)) {
2815 bombout(("Unexpected data from server"
2816 " while waiting for agent"
2820 } while (ispkt
|| inlen
> 0);
2821 vret
= ssh
->agent_response
;
2822 retlen
= ssh
->agent_response_len
;
2827 if (ret
[4] == SSH1_AGENT_RSA_RESPONSE
) {
2828 logevent("Sending Pageant's response");
2829 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
2830 PKT_DATA
, ret
+ 5, 16,
2834 if (ssh
->pktin
.type
== SSH1_SMSG_SUCCESS
) {
2836 ("Pageant's response accepted");
2837 if (flags
& FLAG_VERBOSE
) {
2838 c_write_str(ssh
, "Authenticated using"
2840 c_write(ssh
, s
->commentp
,
2842 c_write_str(ssh
, "\" from agent\r\n");
2847 ("Pageant's response not accepted");
2850 ("Pageant failed to answer challenge");
2854 logevent("No reply received from Pageant");
2857 freebn(s
->key
.exponent
);
2858 freebn(s
->key
.modulus
);
2859 freebn(s
->challenge
);
2868 if (!filename_is_null(ssh
->cfg
.keyfile
) && !s
->tried_publickey
)
2869 s
->pwpkt_type
= SSH1_CMSG_AUTH_RSA
;
2871 if (ssh
->cfg
.try_tis_auth
&&
2872 (s
->supported_auths_mask
& (1 << SSH1_AUTH_TIS
)) &&
2873 !s
->tis_auth_refused
) {
2874 s
->pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
2875 logevent("Requested TIS authentication");
2876 send_packet(ssh
, SSH1_CMSG_AUTH_TIS
, PKT_END
);
2878 if (ssh
->pktin
.type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
2879 logevent("TIS authentication declined");
2880 if (flags
& FLAG_INTERACTIVE
)
2881 c_write_str(ssh
, "TIS authentication refused.\r\n");
2882 s
->tis_auth_refused
= 1;
2888 ssh_pkt_getstring(ssh
, &challenge
, &challengelen
);
2890 bombout(("TIS challenge packet was badly formed"));
2893 logevent("Received TIS challenge");
2894 if (challengelen
> sizeof(s
->prompt
) - 1)
2895 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
2896 memcpy(s
->prompt
, challenge
, challengelen
);
2897 /* Prompt heuristic comes from OpenSSH */
2898 strncpy(s
->prompt
+ challengelen
,
2899 memchr(s
->prompt
, '\n', challengelen
) ?
2900 "": "\r\nResponse: ",
2901 (sizeof s
->prompt
) - challengelen
);
2902 s
->prompt
[(sizeof s
->prompt
) - 1] = '\0';
2905 if (ssh
->cfg
.try_tis_auth
&&
2906 (s
->supported_auths_mask
& (1 << SSH1_AUTH_CCARD
)) &&
2907 !s
->ccard_auth_refused
) {
2908 s
->pwpkt_type
= SSH1_CMSG_AUTH_CCARD_RESPONSE
;
2909 logevent("Requested CryptoCard authentication");
2910 send_packet(ssh
, SSH1_CMSG_AUTH_CCARD
, PKT_END
);
2912 if (ssh
->pktin
.type
!= SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
2913 logevent("CryptoCard authentication declined");
2914 c_write_str(ssh
, "CryptoCard authentication refused.\r\n");
2915 s
->ccard_auth_refused
= 1;
2921 ssh_pkt_getstring(ssh
, &challenge
, &challengelen
);
2923 bombout(("CryptoCard challenge packet was badly formed"));
2926 logevent("Received CryptoCard challenge");
2927 if (challengelen
> sizeof(s
->prompt
) - 1)
2928 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
2929 memcpy(s
->prompt
, challenge
, challengelen
);
2930 strncpy(s
->prompt
+ challengelen
,
2931 memchr(s
->prompt
, '\n', challengelen
) ?
2932 "" : "\r\nResponse: ",
2933 sizeof(s
->prompt
) - challengelen
);
2934 s
->prompt
[sizeof(s
->prompt
) - 1] = '\0';
2937 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
2938 sprintf(s
->prompt
, "%.90s@%.90s's password: ",
2939 s
->username
, ssh
->savedhost
);
2941 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
2942 char *comment
= NULL
;
2945 if (flags
& FLAG_VERBOSE
)
2946 c_write_str(ssh
, "Trying public key authentication.\r\n");
2947 logeventf(ssh
, "Trying public key \"%s\"",
2948 filename_to_str(&ssh
->cfg
.keyfile
));
2949 type
= key_type(&ssh
->cfg
.keyfile
);
2950 if (type
!= SSH_KEYTYPE_SSH1
) {
2951 sprintf(msgbuf
, "Key is of wrong type (%s)",
2952 key_type_to_str(type
));
2954 c_write_str(ssh
, msgbuf
);
2955 c_write_str(ssh
, "\r\n");
2956 s
->tried_publickey
= 1;
2959 if (!rsakey_encrypted(&ssh
->cfg
.keyfile
, &comment
)) {
2960 if (flags
& FLAG_VERBOSE
)
2961 c_write_str(ssh
, "No passphrase required.\r\n");
2964 sprintf(s
->prompt
, "Passphrase for key \"%.100s\": ", comment
);
2969 * Show password prompt, having first obtained it via a TIS
2970 * or CryptoCard exchange if we're doing TIS or CryptoCard
2974 if (!ssh_get_line(s
->prompt
, s
->password
,
2975 sizeof(s
->password
), TRUE
)) {
2977 * get_line failed to get a password (for example
2978 * because one was supplied on the command line
2979 * which has already failed to work). Terminate.
2981 send_packet(ssh
, SSH1_MSG_DISCONNECT
,
2982 PKT_STR
, "No more passwords available to try",
2984 logevent("Unable to authenticate");
2985 connection_fatal(ssh
->frontend
, "Unable to authenticate");
2986 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
2990 /* Prompt may have come from server. We've munged it a bit, so
2991 * we know it to be zero-terminated at least once. */
2992 int ret
; /* need not be saved over crReturn */
2993 c_write_untrusted(ssh
, s
->prompt
, strlen(s
->prompt
));
2996 setup_userpass_input(ssh
, s
->password
, sizeof(s
->password
), 0);
2998 crWaitUntil(!ispkt
);
2999 ret
= process_userpass_input(ssh
, in
, inlen
);
3003 c_write_str(ssh
, "\r\n");
3007 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
3009 * Try public key authentication with the specified
3012 s
->tried_publickey
= 1;
3015 const char *error
= NULL
;
3016 int ret
= loadrsakey(&ssh
->cfg
.keyfile
, &s
->key
, s
->password
,
3019 c_write_str(ssh
, "Couldn't load private key from ");
3020 c_write_str(ssh
, filename_to_str(&ssh
->cfg
.keyfile
));
3021 c_write_str(ssh
, " (");
3022 c_write_str(ssh
, error
);
3023 c_write_str(ssh
, ").\r\n");
3024 continue; /* go and try password */
3027 c_write_str(ssh
, "Wrong passphrase.\r\n");
3028 s
->tried_publickey
= 0;
3029 continue; /* try again */
3034 * Send a public key attempt.
3036 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
3037 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
3040 if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3041 c_write_str(ssh
, "Server refused our public key.\r\n");
3042 continue; /* go and try password */
3044 if (ssh
->pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
3045 bombout(("Bizarre response to offer of public key"));
3051 unsigned char buffer
[32];
3052 Bignum challenge
, response
;
3054 if ((challenge
= ssh1_pkt_getmp(ssh
)) == NULL
) {
3055 bombout(("Server's RSA challenge was badly formatted"));
3058 response
= rsadecrypt(challenge
, &s
->key
);
3059 freebn(s
->key
.private_exponent
);/* burn the evidence */
3061 for (i
= 0; i
< 32; i
++) {
3062 buffer
[i
] = bignum_byte(response
, 31 - i
);
3066 MD5Update(&md5c
, buffer
, 32);
3067 MD5Update(&md5c
, s
->session_id
, 16);
3068 MD5Final(buffer
, &md5c
);
3070 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
3071 PKT_DATA
, buffer
, 16, PKT_END
);
3078 if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3079 if (flags
& FLAG_VERBOSE
)
3080 c_write_str(ssh
, "Failed to authenticate with"
3081 " our public key.\r\n");
3082 continue; /* go and try password */
3083 } else if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
) {
3084 bombout(("Bizarre response to RSA authentication response"));
3088 break; /* we're through! */
3090 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
3092 * Defence against traffic analysis: we send a
3093 * whole bunch of packets containing strings of
3094 * different lengths. One of these strings is the
3095 * password, in a SSH1_CMSG_AUTH_PASSWORD packet.
3096 * The others are all random data in
3097 * SSH1_MSG_IGNORE packets. This way a passive
3098 * listener can't tell which is the password, and
3099 * hence can't deduce the password length.
3101 * Anybody with a password length greater than 16
3102 * bytes is going to have enough entropy in their
3103 * password that a listener won't find it _that_
3104 * much help to know how long it is. So what we'll
3107 * - if password length < 16, we send 15 packets
3108 * containing string lengths 1 through 15
3110 * - otherwise, we let N be the nearest multiple
3111 * of 8 below the password length, and send 8
3112 * packets containing string lengths N through
3113 * N+7. This won't obscure the order of
3114 * magnitude of the password length, but it will
3115 * introduce a bit of extra uncertainty.
3117 * A few servers (the old 1.2.18 through 1.2.22)
3118 * can't deal with SSH1_MSG_IGNORE. For these
3119 * servers, we need an alternative defence. We make
3120 * use of the fact that the password is interpreted
3121 * as a C string: so we can append a NUL, then some
3124 * One server (a Cisco one) can deal with neither
3125 * SSH1_MSG_IGNORE _nor_ a padded password string.
3126 * For this server we are left with no defences
3127 * against password length sniffing.
3129 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
)) {
3131 * The server can deal with SSH1_MSG_IGNORE, so
3132 * we can use the primary defence.
3134 int bottom
, top
, pwlen
, i
;
3137 pwlen
= strlen(s
->password
);
3139 bottom
= 0; /* zero length passwords are OK! :-) */
3142 bottom
= pwlen
& ~7;
3146 assert(pwlen
>= bottom
&& pwlen
<= top
);
3148 randomstr
= snewn(top
+ 1, char);
3150 for (i
= bottom
; i
<= top
; i
++) {
3152 defer_packet(ssh
, s
->pwpkt_type
,
3153 PKT_STR
, s
->password
, PKT_END
);
3155 for (j
= 0; j
< i
; j
++) {
3157 randomstr
[j
] = random_byte();
3158 } while (randomstr
[j
] == '\0');
3160 randomstr
[i
] = '\0';
3161 defer_packet(ssh
, SSH1_MSG_IGNORE
,
3162 PKT_STR
, randomstr
, PKT_END
);
3165 logevent("Sending password with camouflage packets");
3166 ssh_pkt_defersend(ssh
);
3169 else if (!(ssh
->remote_bugs
& BUG_NEEDS_SSH1_PLAIN_PASSWORD
)) {
3171 * The server can't deal with SSH1_MSG_IGNORE
3172 * but can deal with padded passwords, so we
3173 * can use the secondary defence.
3179 len
= strlen(s
->password
);
3180 if (len
< sizeof(string
)) {
3182 strcpy(string
, s
->password
);
3183 len
++; /* cover the zero byte */
3184 while (len
< sizeof(string
)) {
3185 string
[len
++] = (char) random_byte();
3190 logevent("Sending length-padded password");
3191 send_packet(ssh
, s
->pwpkt_type
, PKT_INT
, len
,
3192 PKT_DATA
, ss
, len
, PKT_END
);
3195 * The server has _both_
3196 * BUG_CHOKES_ON_SSH1_IGNORE and
3197 * BUG_NEEDS_SSH1_PLAIN_PASSWORD. There is
3198 * therefore nothing we can do.
3201 len
= strlen(s
->password
);
3202 logevent("Sending unpadded password");
3203 send_packet(ssh
, s
->pwpkt_type
, PKT_INT
, len
,
3204 PKT_DATA
, s
->password
, len
, PKT_END
);
3207 send_packet(ssh
, s
->pwpkt_type
, PKT_STR
, s
->password
, PKT_END
);
3210 logevent("Sent password");
3211 memset(s
->password
, 0, strlen(s
->password
));
3213 if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3214 if (flags
& FLAG_VERBOSE
)
3215 c_write_str(ssh
, "Access denied\r\n");
3216 logevent("Authentication refused");
3217 } else if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
) {
3218 bombout(("Strange packet received, type %d", ssh
->pktin
.type
));
3223 logevent("Authentication successful");
3228 void sshfwd_close(struct ssh_channel
*c
)
3232 if (ssh
->state
!= SSH_STATE_SESSION
) {
3233 assert(ssh
->state
== SSH_STATE_CLOSED
);
3237 if (c
&& !c
->closes
) {
3239 * If the channel's remoteid is -1, we have sent
3240 * CHANNEL_OPEN for this channel, but it hasn't even been
3241 * acknowledged by the server. So we must set a close flag
3242 * on it now, and then when the server acks the channel
3243 * open, we can close it then.
3245 if (((int)c
->remoteid
) != -1) {
3246 if (ssh
->version
== 1) {
3247 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
, PKT_INT
, c
->remoteid
,
3250 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_CLOSE
);
3251 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
3255 c
->closes
= 1; /* sent MSG_CLOSE */
3256 if (c
->type
== CHAN_X11
) {
3258 logevent("Forwarded X11 connection terminated");
3259 } else if (c
->type
== CHAN_SOCKDATA
||
3260 c
->type
== CHAN_SOCKDATA_DORMANT
) {
3262 logevent("Forwarded port closed");
3267 int sshfwd_write(struct ssh_channel
*c
, char *buf
, int len
)
3271 if (ssh
->state
!= SSH_STATE_SESSION
) {
3272 assert(ssh
->state
== SSH_STATE_CLOSED
);
3276 if (ssh
->version
== 1) {
3277 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
3278 PKT_INT
, c
->remoteid
,
3279 PKT_INT
, len
, PKT_DATA
, buf
, len
, PKT_END
);
3281 * In SSH1 we can return 0 here - implying that forwarded
3282 * connections are never individually throttled - because
3283 * the only circumstance that can cause throttling will be
3284 * the whole SSH connection backing up, in which case
3285 * _everything_ will be throttled as a whole.
3289 ssh2_add_channel_data(c
, buf
, len
);
3290 return ssh2_try_send(c
);
3294 void sshfwd_unthrottle(struct ssh_channel
*c
, int bufsize
)
3298 if (ssh
->state
!= SSH_STATE_SESSION
) {
3299 assert(ssh
->state
== SSH_STATE_CLOSED
);
3303 if (ssh
->version
== 1) {
3304 if (c
->v
.v1
.throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
3305 c
->v
.v1
.throttling
= 0;
3306 ssh1_throttle(ssh
, -1);
3309 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
3313 static void ssh1_protocol(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
3315 crBegin(ssh
->ssh1_protocol_crstate
);
3319 while (!do_ssh1_login(ssh
, in
, inlen
, ispkt
)) {
3322 if (ssh
->state
== SSH_STATE_CLOSED
)
3325 if (ssh
->cfg
.agentfwd
&& agent_exists()) {
3326 logevent("Requesting agent forwarding");
3327 send_packet(ssh
, SSH1_CMSG_AGENT_REQUEST_FORWARDING
, PKT_END
);
3331 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3332 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3333 bombout(("Protocol confusion"));
3335 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3336 logevent("Agent forwarding refused");
3338 logevent("Agent forwarding enabled");
3339 ssh
->agentfwd_enabled
= TRUE
;
3343 if (ssh
->cfg
.x11_forward
) {
3344 char proto
[20], data
[64];
3345 logevent("Requesting X11 forwarding");
3346 ssh
->x11auth
= x11_invent_auth(proto
, sizeof(proto
),
3347 data
, sizeof(data
), ssh
->cfg
.x11_auth
);
3348 x11_get_real_auth(ssh
->x11auth
, ssh
->cfg
.x11_display
);
3349 if (ssh
->v1_local_protoflags
& SSH1_PROTOFLAG_SCREEN_NUMBER
) {
3350 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
3351 PKT_STR
, proto
, PKT_STR
, data
,
3352 PKT_INT
, x11_get_screen_number(ssh
->cfg
.x11_display
),
3355 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
3356 PKT_STR
, proto
, PKT_STR
, data
, PKT_END
);
3361 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3362 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3363 bombout(("Protocol confusion"));
3365 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3366 logevent("X11 forwarding refused");
3368 logevent("X11 forwarding enabled");
3369 ssh
->X11_fwd_enabled
= TRUE
;
3376 int sport
,dport
,sserv
,dserv
;
3377 char sports
[256], dports
[256], saddr
[256], host
[256];
3379 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh1
);
3380 /* Add port forwardings. */
3381 ssh
->portfwd_strptr
= ssh
->cfg
.portfwd
;
3382 while (*ssh
->portfwd_strptr
) {
3383 type
= *ssh
->portfwd_strptr
++;
3386 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= '\t') {
3387 if (*ssh
->portfwd_strptr
== ':') {
3389 * We've seen a colon in the middle of the
3390 * source port number. This means that
3391 * everything we've seen until now is the
3392 * source _address_, so we'll move it into
3393 * saddr and start sports from the beginning
3396 ssh
->portfwd_strptr
++;
3398 strcpy(saddr
, sports
);
3401 if (n
< 255) sports
[n
++] = *ssh
->portfwd_strptr
++;
3405 if (*ssh
->portfwd_strptr
== '\t')
3406 ssh
->portfwd_strptr
++;
3408 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= ':') {
3409 if (n
< 255) host
[n
++] = *ssh
->portfwd_strptr
++;
3412 if (*ssh
->portfwd_strptr
== ':')
3413 ssh
->portfwd_strptr
++;
3415 while (*ssh
->portfwd_strptr
) {
3416 if (n
< 255) dports
[n
++] = *ssh
->portfwd_strptr
++;
3419 ssh
->portfwd_strptr
++;
3420 dport
= atoi(dports
);
3424 dport
= net_service_lookup(dports
);
3426 logeventf(ssh
, "Service lookup failed for"
3427 " destination port \"%s\"", dports
);
3431 while (*ssh
->portfwd_strptr
) ssh
->portfwd_strptr
++;
3433 ssh
->portfwd_strptr
++; /* eat the NUL and move to next one */
3435 sport
= atoi(sports
);
3439 sport
= net_service_lookup(sports
);
3441 logeventf(ssh
, "Service lookup failed for source"
3442 " port \"%s\"", sports
);
3445 if (sport
&& dport
) {
3447 pfd_addforward(host
, dport
, *saddr ? saddr
: NULL
,
3448 sport
, ssh
, &ssh
->cfg
);
3449 logeventf(ssh
, "Local port %.*s%.*s%.*s%.*s%d%.*s"
3450 " forwarding to %s:%.*s%.*s%d%.*s",
3451 (int)(*saddr?
strlen(saddr
):0), *saddr?saddr
:NULL
,
3452 (int)(*saddr?
1:0), ":",
3453 (int)(sserv ?
strlen(sports
) : 0), sports
,
3454 sserv
, "(", sport
, sserv
, ")",
3456 (int)(dserv ?
strlen(dports
) : 0), dports
,
3457 dserv
, "(", dport
, dserv
, ")");
3458 } else if (type
== 'D') {
3459 pfd_addforward(NULL
, -1, *saddr ? saddr
: NULL
,
3460 sport
, ssh
, &ssh
->cfg
);
3461 logeventf(ssh
, "Local port %.*s%.*s%.*s%.*s%d%.*s"
3462 " doing SOCKS dynamic forwarding",
3463 (int)(*saddr?
strlen(saddr
):0), *saddr?saddr
:NULL
,
3464 (int)(*saddr?
1:0), ":",
3465 (int)(sserv ?
strlen(sports
) : 0), sports
,
3466 sserv
, "(", sport
, sserv
, ")");
3468 struct ssh_rportfwd
*pf
;
3469 pf
= snew(struct ssh_rportfwd
);
3470 strcpy(pf
->dhost
, host
);
3474 "SSH1 cannot handle source address spec \"%s:%d\"; ignoring",
3477 if (add234(ssh
->rportfwds
, pf
) != pf
) {
3479 "Duplicate remote port forwarding to %s:%d",
3483 logeventf(ssh
, "Requesting remote port %.*s%.*s%d%.*s"
3484 " forward to %s:%.*s%.*s%d%.*s",
3485 (int)(sserv ?
strlen(sports
) : 0), sports
,
3486 sserv
, "(", sport
, sserv
, ")",
3488 (int)(dserv ?
strlen(dports
) : 0), dports
,
3489 dserv
, "(", dport
, dserv
, ")");
3490 send_packet(ssh
, SSH1_CMSG_PORT_FORWARD_REQUEST
,
3498 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3499 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3500 bombout(("Protocol confusion"));
3502 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3503 c_write_str(ssh
, "Server refused port"
3506 logevent("Remote port forwarding enabled");
3513 if (!ssh
->cfg
.nopty
) {
3514 /* Unpick the terminal-speed string. */
3515 /* XXX perhaps we should allow no speeds to be sent. */
3516 ssh
->ospeed
= 38400; ssh
->ispeed
= 38400; /* last-resort defaults */
3517 sscanf(ssh
->cfg
.termspeed
, "%d,%d", &ssh
->ospeed
, &ssh
->ispeed
);
3518 /* Send the pty request. */
3519 send_packet(ssh
, SSH1_CMSG_REQUEST_PTY
,
3520 PKT_STR
, ssh
->cfg
.termtype
,
3521 PKT_INT
, ssh
->term_height
,
3522 PKT_INT
, ssh
->term_width
,
3523 PKT_INT
, 0, PKT_INT
, 0, /* width,height in pixels */
3524 PKT_CHAR
, 192, PKT_INT
, ssh
->ispeed
, /* TTY_OP_ISPEED */
3525 PKT_CHAR
, 193, PKT_INT
, ssh
->ospeed
, /* TTY_OP_OSPEED */
3526 PKT_CHAR
, 0, PKT_END
);
3527 ssh
->state
= SSH_STATE_INTERMED
;
3531 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3532 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3533 bombout(("Protocol confusion"));
3535 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3536 c_write_str(ssh
, "Server refused to allocate pty\r\n");
3537 ssh
->editing
= ssh
->echoing
= 1;
3539 logeventf(ssh
, "Allocated pty (ospeed %dbps, ispeed %dbps)",
3540 ssh
->ospeed
, ssh
->ispeed
);
3542 ssh
->editing
= ssh
->echoing
= 1;
3545 if (ssh
->cfg
.compression
) {
3546 send_packet(ssh
, SSH1_CMSG_REQUEST_COMPRESSION
, PKT_INT
, 6, PKT_END
);
3550 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3551 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3552 bombout(("Protocol confusion"));
3554 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3555 c_write_str(ssh
, "Server refused to compress\r\n");
3557 logevent("Started compression");
3558 ssh
->v1_compressing
= TRUE
;
3559 ssh
->cs_comp_ctx
= zlib_compress_init();
3560 logevent("Initialised zlib (RFC1950) compression");
3561 ssh
->sc_comp_ctx
= zlib_decompress_init();
3562 logevent("Initialised zlib (RFC1950) decompression");
3566 * Start the shell or command.
3568 * Special case: if the first-choice command is an SSH2
3569 * subsystem (hence not usable here) and the second choice
3570 * exists, we fall straight back to that.
3573 char *cmd
= ssh
->cfg
.remote_cmd_ptr
;
3575 if (ssh
->cfg
.ssh_subsys
&& ssh
->cfg
.remote_cmd_ptr2
) {
3576 cmd
= ssh
->cfg
.remote_cmd_ptr2
;
3577 ssh
->fallback_cmd
= TRUE
;
3580 send_packet(ssh
, SSH1_CMSG_EXEC_CMD
, PKT_STR
, cmd
, PKT_END
);
3582 send_packet(ssh
, SSH1_CMSG_EXEC_SHELL
, PKT_END
);
3583 logevent("Started session");
3586 ssh
->state
= SSH_STATE_SESSION
;
3587 if (ssh
->size_needed
)
3588 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
3589 if (ssh
->eof_needed
)
3590 ssh_special(ssh
, TS_EOF
);
3593 ldisc_send(ssh
->ldisc
, NULL
, 0, 0);/* cause ldisc to notice changes */
3595 ssh
->channels
= newtree234(ssh_channelcmp
);
3599 if (ssh
->pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
3600 ssh
->pktin
.type
== SSH1_SMSG_STDERR_DATA
) {
3602 int stringlen
, bufsize
;
3604 ssh_pkt_getstring(ssh
, &string
, &stringlen
);
3605 if (string
== NULL
) {
3606 bombout(("Incoming terminal data packet was badly formed"));
3611 from_backend(ssh
->frontend
,
3612 ssh
->pktin
.type
== SSH1_SMSG_STDERR_DATA
,
3614 if (!ssh
->v1_stdout_throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
3615 ssh
->v1_stdout_throttling
= 1;
3616 ssh1_throttle(ssh
, +1);
3618 } else if (ssh
->pktin
.type
== SSH1_MSG_DISCONNECT
) {
3619 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
3620 logevent("Received disconnect request");
3622 } else if (ssh
->pktin
.type
== SSH1_SMSG_X11_OPEN
) {
3623 /* Remote side is trying to open a channel to talk to our
3624 * X-Server. Give them back a local channel number. */
3625 struct ssh_channel
*c
;
3626 int remoteid
= ssh_pkt_getuint32(ssh
);
3628 logevent("Received X11 connect request");
3629 /* Refuse if X11 forwarding is disabled. */
3630 if (!ssh
->X11_fwd_enabled
) {
3631 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3632 PKT_INT
, remoteid
, PKT_END
);
3633 logevent("Rejected X11 connect request");
3635 c
= snew(struct ssh_channel
);
3638 if (x11_init(&c
->u
.x11
.s
, ssh
->cfg
.x11_display
, c
,
3639 ssh
->x11auth
, NULL
, -1, &ssh
->cfg
) != NULL
) {
3640 logevent("Opening X11 forward connection failed");
3642 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3643 PKT_INT
, remoteid
, PKT_END
);
3646 ("Opening X11 forward connection succeeded");
3647 c
->remoteid
= remoteid
;
3648 c
->localid
= alloc_channel_id(ssh
);
3650 c
->v
.v1
.throttling
= 0;
3651 c
->type
= CHAN_X11
; /* identify channel type */
3652 add234(ssh
->channels
, c
);
3653 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3654 PKT_INT
, c
->remoteid
, PKT_INT
,
3655 c
->localid
, PKT_END
);
3656 logevent("Opened X11 forward channel");
3659 } else if (ssh
->pktin
.type
== SSH1_SMSG_AGENT_OPEN
) {
3660 /* Remote side is trying to open a channel to talk to our
3661 * agent. Give them back a local channel number. */
3662 struct ssh_channel
*c
;
3663 int remoteid
= ssh_pkt_getuint32(ssh
);
3665 /* Refuse if agent forwarding is disabled. */
3666 if (!ssh
->agentfwd_enabled
) {
3667 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3668 PKT_INT
, remoteid
, PKT_END
);
3670 c
= snew(struct ssh_channel
);
3672 c
->remoteid
= remoteid
;
3673 c
->localid
= alloc_channel_id(ssh
);
3675 c
->v
.v1
.throttling
= 0;
3676 c
->type
= CHAN_AGENT
; /* identify channel type */
3677 c
->u
.a
.lensofar
= 0;
3678 add234(ssh
->channels
, c
);
3679 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3680 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
3683 } else if (ssh
->pktin
.type
== SSH1_MSG_PORT_OPEN
) {
3684 /* Remote side is trying to open a channel to talk to a
3685 * forwarded port. Give them back a local channel number. */
3686 struct ssh_channel
*c
;
3687 struct ssh_rportfwd pf
;
3690 char *host
, buf
[1024];
3692 c
= snew(struct ssh_channel
);
3695 remoteid
= ssh_pkt_getuint32(ssh
);
3696 ssh_pkt_getstring(ssh
, &host
, &hostsize
);
3697 port
= ssh_pkt_getuint32(ssh
);
3699 if (hostsize
>= lenof(pf
.dhost
))
3700 hostsize
= lenof(pf
.dhost
)-1;
3701 memcpy(pf
.dhost
, host
, hostsize
);
3702 pf
.dhost
[hostsize
] = '\0';
3705 if (find234(ssh
->rportfwds
, &pf
, NULL
) == NULL
) {
3706 sprintf(buf
, "Rejected remote port open request for %s:%d",
3709 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3710 PKT_INT
, remoteid
, PKT_END
);
3712 sprintf(buf
, "Received remote port open request for %s:%d",
3715 e
= pfd_newconnect(&c
->u
.pfd
.s
, pf
.dhost
, port
,
3719 sprintf(buf
, "Port open failed: %s", e
);
3722 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3723 PKT_INT
, remoteid
, PKT_END
);
3725 c
->remoteid
= remoteid
;
3726 c
->localid
= alloc_channel_id(ssh
);
3728 c
->v
.v1
.throttling
= 0;
3729 c
->type
= CHAN_SOCKDATA
; /* identify channel type */
3730 add234(ssh
->channels
, c
);
3731 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3732 PKT_INT
, c
->remoteid
, PKT_INT
,
3733 c
->localid
, PKT_END
);
3734 logevent("Forwarded port opened successfully");
3738 } else if (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
) {
3739 unsigned int remoteid
= ssh_pkt_getuint32(ssh
);
3740 unsigned int localid
= ssh_pkt_getuint32(ssh
);
3741 struct ssh_channel
*c
;
3743 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
3744 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
3745 c
->remoteid
= localid
;
3746 c
->type
= CHAN_SOCKDATA
;
3747 c
->v
.v1
.throttling
= 0;
3748 pfd_confirm(c
->u
.pfd
.s
);
3751 if (c
&& c
->closes
) {
3753 * We have a pending close on this channel,
3754 * which we decided on before the server acked
3755 * the channel open. So now we know the
3756 * remoteid, we can close it again.
3758 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
,
3759 PKT_INT
, c
->remoteid
, PKT_END
);
3762 } else if (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_OPEN_FAILURE
) {
3763 unsigned int remoteid
= ssh_pkt_getuint32(ssh
);
3764 struct ssh_channel
*c
;
3766 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
3767 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
3768 logevent("Forwarded connection refused by server");
3769 pfd_close(c
->u
.pfd
.s
);
3770 del234(ssh
->channels
, c
);
3774 } else if (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_CLOSE
||
3775 ssh
->pktin
.type
== SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
) {
3776 /* Remote side closes a channel. */
3777 unsigned i
= ssh_pkt_getuint32(ssh
);
3778 struct ssh_channel
*c
;
3779 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
3780 if (c
&& ((int)c
->remoteid
) != -1) {
3783 (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_CLOSE ?
1 : 2);
3785 if ((c
->closes
== 0) && (c
->type
== CHAN_X11
)) {
3786 logevent("Forwarded X11 connection terminated");
3787 assert(c
->u
.x11
.s
!= NULL
);
3788 x11_close(c
->u
.x11
.s
);
3791 if ((c
->closes
== 0) && (c
->type
== CHAN_SOCKDATA
)) {
3792 logevent("Forwarded port closed");
3793 assert(c
->u
.pfd
.s
!= NULL
);
3794 pfd_close(c
->u
.pfd
.s
);
3798 c
->closes
|= (closetype
<< 2); /* seen this message */
3799 if (!(c
->closes
& closetype
)) {
3800 send_packet(ssh
, ssh
->pktin
.type
, PKT_INT
, c
->remoteid
,
3802 c
->closes
|= closetype
; /* sent it too */
3805 if (c
->closes
== 15) {
3806 del234(ssh
->channels
, c
);
3810 bombout(("Received CHANNEL_CLOSE%s for %s channel %d\n",
3811 ssh
->pktin
.type
== SSH1_MSG_CHANNEL_CLOSE ?
"" :
3812 "_CONFIRMATION", c ?
"half-open" : "nonexistent",
3816 } else if (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_DATA
) {
3817 /* Data sent down one of our channels. */
3818 int i
= ssh_pkt_getuint32(ssh
);
3821 struct ssh_channel
*c
;
3823 ssh_pkt_getstring(ssh
, &p
, &len
);
3825 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
3830 bufsize
= x11_send(c
->u
.x11
.s
, p
, len
);
3833 bufsize
= pfd_send(c
->u
.pfd
.s
, p
, len
);
3836 /* Data for an agent message. Buffer it. */
3838 if (c
->u
.a
.lensofar
< 4) {
3839 int l
= min(4 - c
->u
.a
.lensofar
, len
);
3840 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
, p
,
3844 c
->u
.a
.lensofar
+= l
;
3846 if (c
->u
.a
.lensofar
== 4) {
3848 4 + GET_32BIT(c
->u
.a
.msglen
);
3849 c
->u
.a
.message
= snewn(c
->u
.a
.totallen
,
3851 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
3853 if (c
->u
.a
.lensofar
>= 4 && len
> 0) {
3855 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
3857 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
, p
,
3861 c
->u
.a
.lensofar
+= l
;
3863 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
3866 if (agent_query(c
->u
.a
.message
,
3869 ssh_agentf_callback
, c
))
3870 ssh_agentf_callback(c
, reply
, replylen
);
3871 sfree(c
->u
.a
.message
);
3872 c
->u
.a
.lensofar
= 0;
3875 bufsize
= 0; /* agent channels never back up */
3878 if (!c
->v
.v1
.throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
3879 c
->v
.v1
.throttling
= 1;
3880 ssh1_throttle(ssh
, +1);
3883 } else if (ssh
->pktin
.type
== SSH1_SMSG_SUCCESS
) {
3884 /* may be from EXEC_SHELL on some servers */
3885 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3886 /* may be from EXEC_SHELL on some servers
3887 * if no pty is available or in other odd cases. Ignore */
3888 } else if (ssh
->pktin
.type
== SSH1_SMSG_EXIT_STATUS
) {
3890 ssh
->exitcode
= ssh_pkt_getuint32(ssh
);
3891 sprintf(buf
, "Server sent command exit status %d",
3894 send_packet(ssh
, SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
3896 * In case `helpful' firewalls or proxies tack
3897 * extra human-readable text on the end of the
3898 * session which we might mistake for another
3899 * encrypted packet, we close the session once
3900 * we've sent EXIT_CONFIRMATION.
3902 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
3905 bombout(("Strange packet received: type %d", ssh
->pktin
.type
));
3910 int len
= min(inlen
, 512);
3911 send_packet(ssh
, SSH1_CMSG_STDIN_DATA
,
3912 PKT_INT
, len
, PKT_DATA
, in
, len
, PKT_END
);
3923 * Utility routine for decoding comma-separated strings in KEXINIT.
3925 static int in_commasep_string(char *needle
, char *haystack
, int haylen
)
3928 if (!needle
|| !haystack
) /* protect against null pointers */
3930 needlen
= strlen(needle
);
3933 * Is it at the start of the string?
3935 if (haylen
>= needlen
&& /* haystack is long enough */
3936 !memcmp(needle
, haystack
, needlen
) && /* initial match */
3937 (haylen
== needlen
|| haystack
[needlen
] == ',')
3938 /* either , or EOS follows */
3942 * If not, search for the next comma and resume after that.
3943 * If no comma found, terminate.
3945 while (haylen
> 0 && *haystack
!= ',')
3946 haylen
--, haystack
++;
3949 haylen
--, haystack
++; /* skip over comma itself */
3954 * SSH2 key creation method.
3956 static void ssh2_mkkey(Ssh ssh
, Bignum K
, unsigned char *H
,
3957 unsigned char *sessid
, char chr
,
3958 unsigned char *keyspace
)
3961 /* First 20 bytes. */
3963 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
3965 SHA_Bytes(&s
, H
, 20);
3966 SHA_Bytes(&s
, &chr
, 1);
3967 SHA_Bytes(&s
, sessid
, 20);
3968 SHA_Final(&s
, keyspace
);
3969 /* Next 20 bytes. */
3971 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
3973 SHA_Bytes(&s
, H
, 20);
3974 SHA_Bytes(&s
, keyspace
, 20);
3975 SHA_Final(&s
, keyspace
+ 20);
3979 * Handle the SSH2 transport layer.
3981 static int do_ssh2_transport(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
3983 struct do_ssh2_transport_state
{
3984 int nbits
, pbits
, warn
;
3985 Bignum p
, g
, e
, f
, K
;
3986 int kex_init_value
, kex_reply_value
;
3987 const struct ssh_mac
**maclist
;
3989 const struct ssh2_cipher
*cscipher_tobe
;
3990 const struct ssh2_cipher
*sccipher_tobe
;
3991 const struct ssh_mac
*csmac_tobe
;
3992 const struct ssh_mac
*scmac_tobe
;
3993 const struct ssh_compress
*cscomp_tobe
;
3994 const struct ssh_compress
*sccomp_tobe
;
3995 char *hostkeydata
, *sigdata
, *keystr
, *fingerprint
;
3996 int hostkeylen
, siglen
;
3997 void *hkey
; /* actual host key */
3998 unsigned char exchange_hash
[20];
3999 int n_preferred_ciphers
;
4000 const struct ssh2_ciphers
*preferred_ciphers
[CIPHER_MAX
];
4001 const struct ssh_compress
*preferred_comp
;
4004 crState(do_ssh2_transport_state
);
4006 crBegin(ssh
->do_ssh2_transport_crstate
);
4008 s
->cscipher_tobe
= s
->sccipher_tobe
= NULL
;
4009 s
->csmac_tobe
= s
->scmac_tobe
= NULL
;
4010 s
->cscomp_tobe
= s
->sccomp_tobe
= NULL
;
4018 * Set up the preferred ciphers. (NULL => warn below here)
4020 s
->n_preferred_ciphers
= 0;
4021 for (i
= 0; i
< CIPHER_MAX
; i
++) {
4022 switch (ssh
->cfg
.ssh_cipherlist
[i
]) {
4023 case CIPHER_BLOWFISH
:
4024 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_blowfish
;
4027 if (ssh
->cfg
.ssh2_des_cbc
) {
4028 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_des
;
4032 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_3des
;
4035 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_aes
;
4038 /* Flag for later. Don't bother if it's the last in
4040 if (i
< CIPHER_MAX
- 1) {
4041 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = NULL
;
4049 * Set up preferred compression.
4051 if (ssh
->cfg
.compression
)
4052 s
->preferred_comp
= &ssh_zlib
;
4054 s
->preferred_comp
= &ssh_comp_none
;
4057 * Be prepared to work around the buggy MAC problem.
4059 if (ssh
->remote_bugs
& BUG_SSH2_HMAC
)
4060 s
->maclist
= buggymacs
, s
->nmacs
= lenof(buggymacs
);
4062 s
->maclist
= macs
, s
->nmacs
= lenof(macs
);
4066 int i
, j
, cipherstr_started
;
4069 * Construct and send our key exchange packet.
4071 ssh2_pkt_init(ssh
, SSH2_MSG_KEXINIT
);
4072 for (i
= 0; i
< 16; i
++)
4073 ssh2_pkt_addbyte(ssh
, (unsigned char) random_byte());
4074 /* List key exchange algorithms. */
4075 ssh2_pkt_addstring_start(ssh
);
4076 for (i
= 0; i
< lenof(kex_algs
); i
++) {
4077 if (kex_algs
[i
] == &ssh_diffiehellman_gex
&&
4078 (ssh
->remote_bugs
& BUG_SSH2_DH_GEX
))
4080 ssh2_pkt_addstring_str(ssh
, kex_algs
[i
]->name
);
4081 if (i
< lenof(kex_algs
) - 1)
4082 ssh2_pkt_addstring_str(ssh
, ",");
4084 /* List server host key algorithms. */
4085 ssh2_pkt_addstring_start(ssh
);
4086 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
4087 ssh2_pkt_addstring_str(ssh
, hostkey_algs
[i
]->name
);
4088 if (i
< lenof(hostkey_algs
) - 1)
4089 ssh2_pkt_addstring_str(ssh
, ",");
4091 /* List client->server encryption algorithms. */
4092 ssh2_pkt_addstring_start(ssh
);
4093 cipherstr_started
= 0;
4094 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4095 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4096 if (!c
) continue; /* warning flag */
4097 for (j
= 0; j
< c
->nciphers
; j
++) {
4098 if (cipherstr_started
)
4099 ssh2_pkt_addstring_str(ssh
, ",");
4100 ssh2_pkt_addstring_str(ssh
, c
->list
[j
]->name
);
4101 cipherstr_started
= 1;
4104 /* List server->client encryption algorithms. */
4105 ssh2_pkt_addstring_start(ssh
);
4106 cipherstr_started
= 0;
4107 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4108 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4109 if (!c
) continue; /* warning flag */
4110 for (j
= 0; j
< c
->nciphers
; j
++) {
4111 if (cipherstr_started
)
4112 ssh2_pkt_addstring_str(ssh
, ",");
4113 ssh2_pkt_addstring_str(ssh
, c
->list
[j
]->name
);
4114 cipherstr_started
= 1;
4117 /* List client->server MAC algorithms. */
4118 ssh2_pkt_addstring_start(ssh
);
4119 for (i
= 0; i
< s
->nmacs
; i
++) {
4120 ssh2_pkt_addstring_str(ssh
, s
->maclist
[i
]->name
);
4121 if (i
< s
->nmacs
- 1)
4122 ssh2_pkt_addstring_str(ssh
, ",");
4124 /* List server->client MAC algorithms. */
4125 ssh2_pkt_addstring_start(ssh
);
4126 for (i
= 0; i
< s
->nmacs
; i
++) {
4127 ssh2_pkt_addstring_str(ssh
, s
->maclist
[i
]->name
);
4128 if (i
< s
->nmacs
- 1)
4129 ssh2_pkt_addstring_str(ssh
, ",");
4131 /* List client->server compression algorithms. */
4132 ssh2_pkt_addstring_start(ssh
);
4133 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
4134 const struct ssh_compress
*c
=
4135 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
4136 ssh2_pkt_addstring_str(ssh
, c
->name
);
4137 if (i
< lenof(compressions
))
4138 ssh2_pkt_addstring_str(ssh
, ",");
4140 /* List server->client compression algorithms. */
4141 ssh2_pkt_addstring_start(ssh
);
4142 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
4143 const struct ssh_compress
*c
=
4144 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
4145 ssh2_pkt_addstring_str(ssh
, c
->name
);
4146 if (i
< lenof(compressions
))
4147 ssh2_pkt_addstring_str(ssh
, ",");
4149 /* List client->server languages. Empty list. */
4150 ssh2_pkt_addstring_start(ssh
);
4151 /* List server->client languages. Empty list. */
4152 ssh2_pkt_addstring_start(ssh
);
4153 /* First KEX packet does _not_ follow, because we're not that brave. */
4154 ssh2_pkt_addbool(ssh
, FALSE
);
4156 ssh2_pkt_adduint32(ssh
, 0);
4159 ssh
->exhash
= ssh
->exhashbase
;
4160 sha_string(&ssh
->exhash
, ssh
->pktout
.data
+ 5, ssh
->pktout
.length
- 5);
4166 if (ssh
->pktin
.length
> 5)
4167 sha_string(&ssh
->exhash
, ssh
->pktin
.data
+ 5, ssh
->pktin
.length
- 5);
4170 * Now examine the other side's KEXINIT to see what we're up
4177 if (ssh
->pktin
.type
!= SSH2_MSG_KEXINIT
) {
4178 bombout(("expected key exchange packet from server"));
4182 ssh
->hostkey
= NULL
;
4183 s
->cscipher_tobe
= NULL
;
4184 s
->sccipher_tobe
= NULL
;
4185 s
->csmac_tobe
= NULL
;
4186 s
->scmac_tobe
= NULL
;
4187 s
->cscomp_tobe
= NULL
;
4188 s
->sccomp_tobe
= NULL
;
4189 ssh
->pktin
.savedpos
+= 16; /* skip garbage cookie */
4190 ssh_pkt_getstring(ssh
, &str
, &len
); /* key exchange algorithms */
4191 for (i
= 0; i
< lenof(kex_algs
); i
++) {
4192 if (kex_algs
[i
] == &ssh_diffiehellman_gex
&&
4193 (ssh
->remote_bugs
& BUG_SSH2_DH_GEX
))
4195 if (in_commasep_string(kex_algs
[i
]->name
, str
, len
)) {
4196 ssh
->kex
= kex_algs
[i
];
4200 ssh_pkt_getstring(ssh
, &str
, &len
); /* host key algorithms */
4201 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
4202 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
4203 ssh
->hostkey
= hostkey_algs
[i
];
4207 ssh_pkt_getstring(ssh
, &str
, &len
); /* client->server cipher */
4209 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4210 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4214 for (j
= 0; j
< c
->nciphers
; j
++) {
4215 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
4216 s
->cscipher_tobe
= c
->list
[j
];
4221 if (s
->cscipher_tobe
) {
4223 askcipher(ssh
->frontend
, s
->cscipher_tobe
->name
, 1);
4227 if (!s
->cscipher_tobe
) {
4228 bombout(("Couldn't agree a client-to-server cipher (available: %s)",
4229 str ? str
: "(null)"));
4233 ssh_pkt_getstring(ssh
, &str
, &len
); /* server->client cipher */
4235 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4236 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4240 for (j
= 0; j
< c
->nciphers
; j
++) {
4241 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
4242 s
->sccipher_tobe
= c
->list
[j
];
4247 if (s
->sccipher_tobe
) {
4249 askcipher(ssh
->frontend
, s
->sccipher_tobe
->name
, 2);
4253 if (!s
->sccipher_tobe
) {
4254 bombout(("Couldn't agree a server-to-client cipher (available: %s)",
4255 str ? str
: "(null)"));
4259 ssh_pkt_getstring(ssh
, &str
, &len
); /* client->server mac */
4260 for (i
= 0; i
< s
->nmacs
; i
++) {
4261 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
4262 s
->csmac_tobe
= s
->maclist
[i
];
4266 ssh_pkt_getstring(ssh
, &str
, &len
); /* server->client mac */
4267 for (i
= 0; i
< s
->nmacs
; i
++) {
4268 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
4269 s
->scmac_tobe
= s
->maclist
[i
];
4273 ssh_pkt_getstring(ssh
, &str
, &len
); /* client->server compression */
4274 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
4275 const struct ssh_compress
*c
=
4276 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
4277 if (in_commasep_string(c
->name
, str
, len
)) {
4282 ssh_pkt_getstring(ssh
, &str
, &len
); /* server->client compression */
4283 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
4284 const struct ssh_compress
*c
=
4285 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
4286 if (in_commasep_string(c
->name
, str
, len
)) {
4294 * Work out the number of bits of key we will need from the key
4295 * exchange. We start with the maximum key length of either
4301 csbits
= s
->cscipher_tobe
->keylen
;
4302 scbits
= s
->sccipher_tobe
->keylen
;
4303 s
->nbits
= (csbits
> scbits ? csbits
: scbits
);
4305 /* The keys only have 160-bit entropy, since they're based on
4306 * a SHA-1 hash. So cap the key size at 160 bits. */
4311 * If we're doing Diffie-Hellman group exchange, start by
4312 * requesting a group.
4314 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
4315 logevent("Doing Diffie-Hellman group exchange");
4316 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGEX
;
4318 * Work out how big a DH group we will need to allow that
4321 s
->pbits
= 512 << ((s
->nbits
- 1) / 64);
4322 ssh2_pkt_init(ssh
, SSH2_MSG_KEX_DH_GEX_REQUEST
);
4323 ssh2_pkt_adduint32(ssh
, s
->pbits
);
4327 if (ssh
->pktin
.type
!= SSH2_MSG_KEX_DH_GEX_GROUP
) {
4328 bombout(("expected key exchange group packet from server"));
4331 s
->p
= ssh2_pkt_getmp(ssh
);
4332 s
->g
= ssh2_pkt_getmp(ssh
);
4333 ssh
->kex_ctx
= dh_setup_group(s
->p
, s
->g
);
4334 s
->kex_init_value
= SSH2_MSG_KEX_DH_GEX_INIT
;
4335 s
->kex_reply_value
= SSH2_MSG_KEX_DH_GEX_REPLY
;
4337 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGROUP1
;
4338 ssh
->kex_ctx
= dh_setup_group1();
4339 s
->kex_init_value
= SSH2_MSG_KEXDH_INIT
;
4340 s
->kex_reply_value
= SSH2_MSG_KEXDH_REPLY
;
4343 logevent("Doing Diffie-Hellman key exchange");
4345 * Now generate and send e for Diffie-Hellman.
4347 s
->e
= dh_create_e(ssh
->kex_ctx
, s
->nbits
* 2);
4348 ssh2_pkt_init(ssh
, s
->kex_init_value
);
4349 ssh2_pkt_addmp(ssh
, s
->e
);
4353 if (ssh
->pktin
.type
!= s
->kex_reply_value
) {
4354 bombout(("expected key exchange reply packet from server"));
4357 ssh_pkt_getstring(ssh
, &s
->hostkeydata
, &s
->hostkeylen
);
4358 s
->f
= ssh2_pkt_getmp(ssh
);
4359 ssh_pkt_getstring(ssh
, &s
->sigdata
, &s
->siglen
);
4361 s
->K
= dh_find_K(ssh
->kex_ctx
, s
->f
);
4363 sha_string(&ssh
->exhash
, s
->hostkeydata
, s
->hostkeylen
);
4364 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
4365 sha_uint32(&ssh
->exhash
, s
->pbits
);
4366 sha_mpint(&ssh
->exhash
, s
->p
);
4367 sha_mpint(&ssh
->exhash
, s
->g
);
4369 sha_mpint(&ssh
->exhash
, s
->e
);
4370 sha_mpint(&ssh
->exhash
, s
->f
);
4371 sha_mpint(&ssh
->exhash
, s
->K
);
4372 SHA_Final(&ssh
->exhash
, s
->exchange_hash
);
4374 dh_cleanup(ssh
->kex_ctx
);
4375 ssh
->kex_ctx
= NULL
;
4378 debug(("Exchange hash is:\n"));
4379 dmemdump(s
->exchange_hash
, 20);
4382 s
->hkey
= ssh
->hostkey
->newkey(s
->hostkeydata
, s
->hostkeylen
);
4384 !ssh
->hostkey
->verifysig(s
->hkey
, s
->sigdata
, s
->siglen
,
4385 (char *)s
->exchange_hash
, 20)) {
4386 bombout(("Server's host key did not match the signature supplied"));
4391 * Authenticate remote host: verify host key. (We've already
4392 * checked the signature of the exchange hash.)
4394 s
->keystr
= ssh
->hostkey
->fmtkey(s
->hkey
);
4395 s
->fingerprint
= ssh
->hostkey
->fingerprint(s
->hkey
);
4396 verify_ssh_host_key(ssh
->frontend
,
4397 ssh
->savedhost
, ssh
->savedport
, ssh
->hostkey
->keytype
,
4398 s
->keystr
, s
->fingerprint
);
4399 if (s
->first_kex
) { /* don't bother logging this in rekeys */
4400 logevent("Host key fingerprint is:");
4401 logevent(s
->fingerprint
);
4403 sfree(s
->fingerprint
);
4405 ssh
->hostkey
->freekey(s
->hkey
);
4408 * Send SSH2_MSG_NEWKEYS.
4410 ssh2_pkt_init(ssh
, SSH2_MSG_NEWKEYS
);
4414 * Expect SSH2_MSG_NEWKEYS from server.
4417 if (ssh
->pktin
.type
!= SSH2_MSG_NEWKEYS
) {
4418 bombout(("expected new-keys packet from server"));
4423 * Create and initialise session keys.
4425 if (ssh
->cs_cipher_ctx
)
4426 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
4427 ssh
->cscipher
= s
->cscipher_tobe
;
4428 ssh
->cs_cipher_ctx
= ssh
->cscipher
->make_context();
4430 if (ssh
->sc_cipher_ctx
)
4431 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
4432 ssh
->sccipher
= s
->sccipher_tobe
;
4433 ssh
->sc_cipher_ctx
= ssh
->sccipher
->make_context();
4435 if (ssh
->cs_mac_ctx
)
4436 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
4437 ssh
->csmac
= s
->csmac_tobe
;
4438 ssh
->cs_mac_ctx
= ssh
->csmac
->make_context();
4440 if (ssh
->sc_mac_ctx
)
4441 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
4442 ssh
->scmac
= s
->scmac_tobe
;
4443 ssh
->sc_mac_ctx
= ssh
->scmac
->make_context();
4445 if (ssh
->cs_comp_ctx
)
4446 ssh
->cscomp
->compress_cleanup(ssh
->cs_comp_ctx
);
4447 ssh
->cscomp
= s
->cscomp_tobe
;
4448 ssh
->cs_comp_ctx
= ssh
->cscomp
->compress_init();
4450 if (ssh
->sc_comp_ctx
)
4451 ssh
->sccomp
->decompress_cleanup(ssh
->sc_comp_ctx
);
4452 ssh
->sccomp
= s
->sccomp_tobe
;
4453 ssh
->sc_comp_ctx
= ssh
->sccomp
->decompress_init();
4456 * Set IVs after keys. Here we use the exchange hash from the
4457 * _first_ key exchange.
4460 unsigned char keyspace
[40];
4462 memcpy(ssh
->v2_session_id
, s
->exchange_hash
,
4463 sizeof(s
->exchange_hash
));
4464 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'C',keyspace
);
4465 ssh
->cscipher
->setkey(ssh
->cs_cipher_ctx
, keyspace
);
4466 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'D',keyspace
);
4467 ssh
->sccipher
->setkey(ssh
->sc_cipher_ctx
, keyspace
);
4468 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'A',keyspace
);
4469 ssh
->cscipher
->setiv(ssh
->cs_cipher_ctx
, keyspace
);
4470 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'B',keyspace
);
4471 ssh
->sccipher
->setiv(ssh
->sc_cipher_ctx
, keyspace
);
4472 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'E',keyspace
);
4473 ssh
->csmac
->setkey(ssh
->cs_mac_ctx
, keyspace
);
4474 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'F',keyspace
);
4475 ssh
->scmac
->setkey(ssh
->sc_mac_ctx
, keyspace
);
4477 logeventf(ssh
, "Initialised %.200s client->server encryption",
4478 ssh
->cscipher
->text_name
);
4479 logeventf(ssh
, "Initialised %.200s server->client encryption",
4480 ssh
->sccipher
->text_name
);
4481 if (ssh
->cscomp
->text_name
)
4482 logeventf(ssh
, "Initialised %s compression",
4483 ssh
->cscomp
->text_name
);
4484 if (ssh
->sccomp
->text_name
)
4485 logeventf(ssh
, "Initialised %s decompression",
4486 ssh
->sccomp
->text_name
);
4489 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
4495 * If this is the first key exchange phase, we must pass the
4496 * SSH2_MSG_NEWKEYS packet to the next layer, not because it
4497 * wants to see it but because it will need time to initialise
4498 * itself before it sees an actual packet. In subsequent key
4499 * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because
4500 * it would only confuse the layer above.
4502 if (!s
->first_kex
) {
4508 * Now we're encrypting. Begin returning 1 to the protocol main
4509 * function so that other things can run on top of the
4510 * transport. If we ever see a KEXINIT, we must go back to the
4513 while (!(ispkt
&& ssh
->pktin
.type
== SSH2_MSG_KEXINIT
)) {
4516 logevent("Server initiated key re-exchange");
4517 goto begin_key_exchange
;
4523 * Add data to an SSH2 channel output buffer.
4525 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
,
4528 bufchain_add(&c
->v
.v2
.outbuffer
, buf
, len
);
4532 * Attempt to send data on an SSH2 channel.
4534 static int ssh2_try_send(struct ssh_channel
*c
)
4538 while (c
->v
.v2
.remwindow
> 0 && bufchain_size(&c
->v
.v2
.outbuffer
) > 0) {
4541 bufchain_prefix(&c
->v
.v2
.outbuffer
, &data
, &len
);
4542 if ((unsigned)len
> c
->v
.v2
.remwindow
)
4543 len
= c
->v
.v2
.remwindow
;
4544 if ((unsigned)len
> c
->v
.v2
.remmaxpkt
)
4545 len
= c
->v
.v2
.remmaxpkt
;
4546 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_DATA
);
4547 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
4548 ssh2_pkt_addstring_start(ssh
);
4549 ssh2_pkt_addstring_data(ssh
, data
, len
);
4551 bufchain_consume(&c
->v
.v2
.outbuffer
, len
);
4552 c
->v
.v2
.remwindow
-= len
;
4556 * After having sent as much data as we can, return the amount
4559 return bufchain_size(&c
->v
.v2
.outbuffer
);
4563 * Potentially enlarge the window on an SSH2 channel.
4565 static void ssh2_set_window(struct ssh_channel
*c
, unsigned newwin
)
4570 * Never send WINDOW_ADJUST for a channel that the remote side
4571 * already thinks it's closed; there's no point, since it won't
4572 * be sending any more data anyway.
4577 if (newwin
> c
->v
.v2
.locwindow
) {
4578 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
4579 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
4580 ssh2_pkt_adduint32(ssh
, newwin
- c
->v
.v2
.locwindow
);
4582 c
->v
.v2
.locwindow
= newwin
;
4587 * Handle the SSH2 userauth and connection layers.
4589 static void do_ssh2_authconn(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
4591 struct do_ssh2_authconn_state
{
4593 AUTH_INVALID
, AUTH_PUBLICKEY_AGENT
, AUTH_PUBLICKEY_FILE
,
4595 AUTH_KEYBOARD_INTERACTIVE
4599 AUTH_TYPE_PUBLICKEY
,
4600 AUTH_TYPE_PUBLICKEY_OFFER_LOUD
,
4601 AUTH_TYPE_PUBLICKEY_OFFER_QUIET
,
4603 AUTH_TYPE_KEYBOARD_INTERACTIVE
,
4604 AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
4606 int gotit
, need_pw
, can_pubkey
, can_passwd
, can_keyb_inter
;
4607 int tried_pubkey_config
, tried_agent
, tried_keyb_inter
;
4608 int kbd_inter_running
;
4610 int num_prompts
, curr_prompt
, echo
;
4615 void *publickey_blob
;
4616 int publickey_bloblen
;
4617 unsigned char request
[5], *response
, *p
;
4621 char *pkblob
, *alg
, *commentp
;
4622 int pklen
, alglen
, commentlen
;
4623 int siglen
, retlen
, len
;
4624 char *q
, *agentreq
, *ret
;
4627 crState(do_ssh2_authconn_state
);
4629 crBegin(ssh
->do_ssh2_authconn_crstate
);
4632 * Request userauth protocol, and await a response to it.
4634 ssh2_pkt_init(ssh
, SSH2_MSG_SERVICE_REQUEST
);
4635 ssh2_pkt_addstring(ssh
, "ssh-userauth");
4637 crWaitUntilV(ispkt
);
4638 if (ssh
->pktin
.type
!= SSH2_MSG_SERVICE_ACCEPT
) {
4639 bombout(("Server refused user authentication protocol"));
4644 * We repeat this whole loop, including the username prompt,
4645 * until we manage a successful authentication. If the user
4646 * types the wrong _password_, they can be sent back to the
4647 * beginning to try another username, if this is configured on.
4648 * (If they specify a username in the config, they are never
4649 * asked, even if they do give a wrong password.)
4651 * I think this best serves the needs of
4653 * - the people who have no configuration, no keys, and just
4654 * want to try repeated (username,password) pairs until they
4655 * type both correctly
4657 * - people who have keys and configuration but occasionally
4658 * need to fall back to passwords
4660 * - people with a key held in Pageant, who might not have
4661 * logged in to a particular machine before; so they want to
4662 * type a username, and then _either_ their key will be
4663 * accepted, _or_ they will type a password. If they mistype
4664 * the username they will want to be able to get back and
4667 s
->username
[0] = '\0';
4668 s
->got_username
= FALSE
;
4673 if (s
->got_username
&& !ssh
->cfg
.change_username
) {
4675 * We got a username last time round this loop, and
4676 * with change_username turned off we don't try to get
4679 } else if ((flags
& FLAG_INTERACTIVE
) && !*ssh
->cfg
.username
) {
4680 if (ssh_get_line
&& !ssh_getline_pw_only
) {
4681 if (!ssh_get_line("login as: ",
4682 s
->username
, sizeof(s
->username
), FALSE
)) {
4684 * get_line failed to get a username.
4687 logevent("No username provided. Abandoning session.");
4688 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
4692 int ret
; /* need not be saved across crReturn */
4693 c_write_str(ssh
, "login as: ");
4695 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
4697 crWaitUntilV(!ispkt
);
4698 ret
= process_userpass_input(ssh
, in
, inlen
);
4702 c_write_str(ssh
, "\r\n");
4704 s
->username
[strcspn(s
->username
, "\n\r")] = '\0';
4707 strncpy(s
->username
, ssh
->cfg
.username
, sizeof(s
->username
));
4708 s
->username
[sizeof(s
->username
)-1] = '\0';
4709 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
4710 stuff
= dupprintf("Using username \"%s\".\r\n", s
->username
);
4711 c_write_str(ssh
, stuff
);
4715 s
->got_username
= TRUE
;
4718 * Send an authentication request using method "none": (a)
4719 * just in case it succeeds, and (b) so that we know what
4720 * authentication methods we can usefully try next.
4722 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4724 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4725 ssh2_pkt_addstring(ssh
, s
->username
);
4726 ssh2_pkt_addstring(ssh
, "ssh-connection");/* service requested */
4727 ssh2_pkt_addstring(ssh
, "none"); /* method */
4729 s
->type
= AUTH_TYPE_NONE
;
4731 s
->we_are_in
= FALSE
;
4733 s
->tried_pubkey_config
= FALSE
;
4734 s
->tried_agent
= FALSE
;
4735 s
->tried_keyb_inter
= FALSE
;
4736 s
->kbd_inter_running
= FALSE
;
4737 /* Load the pub half of ssh->cfg.keyfile so we notice if it's in Pageant */
4738 if (!filename_is_null(ssh
->cfg
.keyfile
)) {
4740 logeventf(ssh
, "Reading private key file \"%.150s\"",
4741 filename_to_str(&ssh
->cfg
.keyfile
));
4742 keytype
= key_type(&ssh
->cfg
.keyfile
);
4743 if (keytype
== SSH_KEYTYPE_SSH2
) {
4745 ssh2_userkey_loadpub(&ssh
->cfg
.keyfile
, NULL
,
4746 &s
->publickey_bloblen
, NULL
);
4749 logeventf(ssh
, "Unable to use this key file (%s)",
4750 key_type_to_str(keytype
));
4751 msgbuf
= dupprintf("Unable to use key file \"%.150s\""
4753 filename_to_str(&ssh
->cfg
.keyfile
),
4754 key_type_to_str(keytype
));
4755 c_write_str(ssh
, msgbuf
);
4757 s
->publickey_blob
= NULL
;
4760 s
->publickey_blob
= NULL
;
4764 * Wait for the result of the last authentication request.
4767 crWaitUntilV(ispkt
);
4768 while (ssh
->pktin
.type
== SSH2_MSG_USERAUTH_BANNER
) {
4772 * Don't show the banner if we're operating in
4773 * non-verbose non-interactive mode. (It's probably
4774 * a script, which means nobody will read the
4775 * banner _anyway_, and moreover the printing of
4776 * the banner will screw up processing on the
4777 * output of (say) plink.)
4779 if (flags
& (FLAG_VERBOSE
| FLAG_INTERACTIVE
)) {
4780 ssh_pkt_getstring(ssh
, &banner
, &size
);
4782 c_write_untrusted(ssh
, banner
, size
);
4784 crWaitUntilV(ispkt
);
4786 if (ssh
->pktin
.type
== SSH2_MSG_USERAUTH_SUCCESS
) {
4787 logevent("Access granted");
4788 s
->we_are_in
= TRUE
;
4792 if (s
->kbd_inter_running
&&
4793 ssh
->pktin
.type
== SSH2_MSG_USERAUTH_INFO_REQUEST
) {
4795 * This is either a further set-of-prompts packet
4796 * in keyboard-interactive authentication, or it's
4797 * the same one and we came back here with `gotit'
4798 * set. In the former case, we must reset the
4799 * curr_prompt variable.
4803 } else if (ssh
->pktin
.type
!= SSH2_MSG_USERAUTH_FAILURE
) {
4804 bombout(("Strange packet received during authentication: type %d",
4812 * OK, we're now sitting on a USERAUTH_FAILURE message, so
4813 * we can look at the string in it and know what we can
4814 * helpfully try next.
4816 if (ssh
->pktin
.type
== SSH2_MSG_USERAUTH_FAILURE
) {
4819 ssh_pkt_getstring(ssh
, &methods
, &methlen
);
4820 s
->kbd_inter_running
= FALSE
;
4821 if (!ssh2_pkt_getbool(ssh
)) {
4823 * We have received an unequivocal Access
4824 * Denied. This can translate to a variety of
4827 * - if we'd just tried "none" authentication,
4828 * it's not worth printing anything at all
4830 * - if we'd just tried a public key _offer_,
4831 * the message should be "Server refused our
4832 * key" (or no message at all if the key
4833 * came from Pageant)
4835 * - if we'd just tried anything else, the
4836 * message really should be "Access denied".
4838 * Additionally, if we'd just tried password
4839 * authentication, we should break out of this
4840 * whole loop so as to go back to the username
4843 if (s
->type
== AUTH_TYPE_NONE
) {
4845 } else if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
||
4846 s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_QUIET
) {
4847 if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
)
4848 c_write_str(ssh
, "Server refused our key\r\n");
4849 logevent("Server refused public key");
4850 } else if (s
->type
==AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
) {
4851 /* server declined keyboard-interactive; ignore */
4853 c_write_str(ssh
, "Access denied\r\n");
4854 logevent("Access denied");
4855 if (s
->type
== AUTH_TYPE_PASSWORD
) {
4856 s
->we_are_in
= FALSE
;
4861 c_write_str(ssh
, "Further authentication required\r\n");
4862 logevent("Further authentication required");
4866 in_commasep_string("publickey", methods
, methlen
);
4868 in_commasep_string("password", methods
, methlen
);
4869 s
->can_keyb_inter
= ssh
->cfg
.try_ki_auth
&&
4870 in_commasep_string("keyboard-interactive", methods
, methlen
);
4874 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4878 * Most password/passphrase prompts will be
4879 * non-echoing, so we set this to 0 by default.
4880 * Exception is that some keyboard-interactive prompts
4881 * can be echoing, in which case we'll set this to 1.
4885 if (!s
->method
&& s
->can_pubkey
&&
4886 agent_exists() && !s
->tried_agent
) {
4888 * Attempt public-key authentication using Pageant.
4893 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4894 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
4896 s
->tried_agent
= TRUE
;
4898 logevent("Pageant is running. Requesting keys.");
4900 /* Request the keys held by the agent. */
4901 PUT_32BIT(s
->request
, 1);
4902 s
->request
[4] = SSH2_AGENTC_REQUEST_IDENTITIES
;
4903 if (!agent_query(s
->request
, 5, &r
, &s
->responselen
,
4904 ssh_agent_callback
, ssh
)) {
4908 bombout(("Unexpected data from server while"
4909 " waiting for agent response"));
4912 } while (ispkt
|| inlen
> 0);
4913 r
= ssh
->agent_response
;
4914 s
->responselen
= ssh
->agent_response_len
;
4916 s
->response
= (unsigned char *) r
;
4917 if (s
->response
&& s
->responselen
>= 5 &&
4918 s
->response
[4] == SSH2_AGENT_IDENTITIES_ANSWER
) {
4919 s
->p
= s
->response
+ 5;
4920 s
->nkeys
= GET_32BIT(s
->p
);
4924 sprintf(buf
, "Pageant has %d SSH2 keys", s
->nkeys
);
4927 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
4932 sprintf(buf
, "Trying Pageant key #%d", s
->keyi
);
4935 s
->pklen
= GET_32BIT(s
->p
);
4937 if (s
->publickey_blob
&&
4938 s
->pklen
== s
->publickey_bloblen
&&
4939 !memcmp(s
->p
, s
->publickey_blob
,
4940 s
->publickey_bloblen
)) {
4941 logevent("This key matches configured key file");
4942 s
->tried_pubkey_config
= 1;
4944 s
->pkblob
= (char *)s
->p
;
4946 s
->alglen
= GET_32BIT(s
->pkblob
);
4947 s
->alg
= s
->pkblob
+ 4;
4948 s
->commentlen
= GET_32BIT(s
->p
);
4950 s
->commentp
= (char *)s
->p
;
4951 s
->p
+= s
->commentlen
;
4952 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4953 ssh2_pkt_addstring(ssh
, s
->username
);
4954 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4955 ssh2_pkt_addstring(ssh
, "publickey"); /* method */
4956 ssh2_pkt_addbool(ssh
, FALSE
); /* no signature included */
4957 ssh2_pkt_addstring_start(ssh
);
4958 ssh2_pkt_addstring_data(ssh
, s
->alg
, s
->alglen
);
4959 ssh2_pkt_addstring_start(ssh
);
4960 ssh2_pkt_addstring_data(ssh
, s
->pkblob
, s
->pklen
);
4963 crWaitUntilV(ispkt
);
4964 if (ssh
->pktin
.type
!= SSH2_MSG_USERAUTH_PK_OK
) {
4965 logevent("Key refused");
4969 if (flags
& FLAG_VERBOSE
) {
4970 c_write_str(ssh
, "Authenticating with "
4972 c_write(ssh
, s
->commentp
, s
->commentlen
);
4973 c_write_str(ssh
, "\" from agent\r\n");
4977 * Server is willing to accept the key.
4978 * Construct a SIGN_REQUEST.
4980 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4981 ssh2_pkt_addstring(ssh
, s
->username
);
4982 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4983 ssh2_pkt_addstring(ssh
, "publickey"); /* method */
4984 ssh2_pkt_addbool(ssh
, TRUE
);
4985 ssh2_pkt_addstring_start(ssh
);
4986 ssh2_pkt_addstring_data(ssh
, s
->alg
, s
->alglen
);
4987 ssh2_pkt_addstring_start(ssh
);
4988 ssh2_pkt_addstring_data(ssh
, s
->pkblob
, s
->pklen
);
4990 s
->siglen
= ssh
->pktout
.length
- 5 + 4 + 20;
4991 if (ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)
4993 s
->len
= 1; /* message type */
4994 s
->len
+= 4 + s
->pklen
; /* key blob */
4995 s
->len
+= 4 + s
->siglen
; /* data to sign */
4996 s
->len
+= 4; /* flags */
4997 s
->agentreq
= snewn(4 + s
->len
, char);
4998 PUT_32BIT(s
->agentreq
, s
->len
);
4999 s
->q
= s
->agentreq
+ 4;
5000 *s
->q
++ = SSH2_AGENTC_SIGN_REQUEST
;
5001 PUT_32BIT(s
->q
, s
->pklen
);
5003 memcpy(s
->q
, s
->pkblob
, s
->pklen
);
5005 PUT_32BIT(s
->q
, s
->siglen
);
5007 /* Now the data to be signed... */
5008 if (!(ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)) {
5009 PUT_32BIT(s
->q
, 20);
5012 memcpy(s
->q
, ssh
->v2_session_id
, 20);
5014 memcpy(s
->q
, ssh
->pktout
.data
+ 5,
5015 ssh
->pktout
.length
- 5);
5016 s
->q
+= ssh
->pktout
.length
- 5;
5017 /* And finally the (zero) flags word. */
5019 if (!agent_query(s
->agentreq
, s
->len
+ 4,
5021 ssh_agent_callback
, ssh
)) {
5025 bombout(("Unexpected data from server"
5026 " while waiting for agent"
5030 } while (ispkt
|| inlen
> 0);
5031 vret
= ssh
->agent_response
;
5032 s
->retlen
= ssh
->agent_response_len
;
5037 if (s
->ret
[4] == SSH2_AGENT_SIGN_RESPONSE
) {
5038 logevent("Sending Pageant's response");
5039 ssh2_add_sigblob(ssh
, s
->pkblob
, s
->pklen
,
5041 GET_32BIT(s
->ret
+ 5));
5047 ("Pageant failed to answer challenge");
5058 if (!s
->method
&& s
->can_pubkey
&& s
->publickey_blob
5059 && !s
->tried_pubkey_config
) {
5060 unsigned char *pub_blob
;
5061 char *algorithm
, *comment
;
5064 s
->tried_pubkey_config
= TRUE
;
5066 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
5067 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
5070 * Try the public key supplied in the configuration.
5072 * First, offer the public blob to see if the server is
5073 * willing to accept it.
5076 (unsigned char *)ssh2_userkey_loadpub(&ssh
->cfg
.keyfile
,
5081 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
5082 ssh2_pkt_addstring(ssh
, s
->username
);
5083 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
5084 ssh2_pkt_addstring(ssh
, "publickey"); /* method */
5085 ssh2_pkt_addbool(ssh
, FALSE
); /* no signature included */
5086 ssh2_pkt_addstring(ssh
, algorithm
);
5087 ssh2_pkt_addstring_start(ssh
);
5088 ssh2_pkt_addstring_data(ssh
, (char *)pub_blob
,
5091 logevent("Offered public key"); /* FIXME */
5093 crWaitUntilV(ispkt
);
5094 if (ssh
->pktin
.type
!= SSH2_MSG_USERAUTH_PK_OK
) {
5096 s
->type
= AUTH_TYPE_PUBLICKEY_OFFER_LOUD
;
5097 continue; /* key refused; give up on it */
5100 logevent("Offer of public key accepted");
5102 * Actually attempt a serious authentication using
5105 if (ssh2_userkey_encrypted(&ssh
->cfg
.keyfile
, &comment
)) {
5106 sprintf(s
->pwprompt
,
5107 "Passphrase for key \"%.100s\": ",
5113 if (flags
& FLAG_VERBOSE
) {
5114 c_write_str(ssh
, "Authenticating with public key \"");
5115 c_write_str(ssh
, comment
);
5116 c_write_str(ssh
, "\"\r\n");
5118 s
->method
= AUTH_PUBLICKEY_FILE
;
5122 if (!s
->method
&& s
->can_keyb_inter
&& !s
->tried_keyb_inter
) {
5123 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
5124 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
5125 s
->tried_keyb_inter
= TRUE
;
5127 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
5128 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
5130 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
5131 ssh2_pkt_addstring(ssh
, s
->username
);
5132 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
5133 ssh2_pkt_addstring(ssh
, "keyboard-interactive"); /* method */
5134 ssh2_pkt_addstring(ssh
, ""); /* lang */
5135 ssh2_pkt_addstring(ssh
, "");
5138 crWaitUntilV(ispkt
);
5139 if (ssh
->pktin
.type
!= SSH2_MSG_USERAUTH_INFO_REQUEST
) {
5140 if (ssh
->pktin
.type
== SSH2_MSG_USERAUTH_FAILURE
)
5142 logevent("Keyboard-interactive authentication refused");
5143 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
;
5147 s
->kbd_inter_running
= TRUE
;
5151 if (s
->kbd_inter_running
) {
5152 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
5153 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
5154 s
->tried_keyb_inter
= TRUE
;
5156 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
5157 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
5159 if (s
->curr_prompt
== 0) {
5161 * We've got a fresh USERAUTH_INFO_REQUEST.
5162 * Display header data, and start going through
5165 char *name
, *inst
, *lang
;
5166 int name_len
, inst_len
, lang_len
;
5168 ssh_pkt_getstring(ssh
, &name
, &name_len
);
5169 ssh_pkt_getstring(ssh
, &inst
, &inst_len
);
5170 ssh_pkt_getstring(ssh
, &lang
, &lang_len
);
5172 c_write_untrusted(ssh
, name
, name_len
);
5173 c_write_str(ssh
, "\r\n");
5176 c_write_untrusted(ssh
, inst
, inst_len
);
5177 c_write_str(ssh
, "\r\n");
5179 s
->num_prompts
= ssh_pkt_getuint32(ssh
);
5183 * If there are prompts remaining in the packet,
5184 * display one and get a response.
5186 if (s
->curr_prompt
< s
->num_prompts
) {
5190 ssh_pkt_getstring(ssh
, &prompt
, &prompt_len
);
5191 if (prompt_len
> 0) {
5192 strncpy(s
->pwprompt
, prompt
, sizeof(s
->pwprompt
));
5193 s
->pwprompt
[prompt_len
< sizeof(s
->pwprompt
) ?
5194 prompt_len
: sizeof(s
->pwprompt
)-1] = '\0';
5197 "<server failed to send prompt>: ");
5199 s
->echo
= ssh2_pkt_getbool(ssh
);
5205 if (!s
->method
&& s
->can_passwd
) {
5206 s
->method
= AUTH_PASSWORD
;
5207 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
5208 ssh
->pkt_ctx
|= SSH2_PKTCTX_PASSWORD
;
5209 sprintf(s
->pwprompt
, "%.90s@%.90s's password: ", s
->username
,
5216 if (!ssh_get_line(s
->pwprompt
, s
->password
,
5217 sizeof(s
->password
), TRUE
)) {
5219 * get_line failed to get a password (for
5220 * example because one was supplied on the
5221 * command line which has already failed to
5224 ssh2_pkt_init(ssh
, SSH2_MSG_DISCONNECT
);
5225 ssh2_pkt_adduint32(ssh
,SSH2_DISCONNECT_BY_APPLICATION
);
5226 ssh2_pkt_addstring(ssh
, "No more passwords available"
5228 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
5230 logevent("Unable to authenticate");
5231 connection_fatal(ssh
->frontend
,
5232 "Unable to authenticate");
5233 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5237 int ret
; /* need not be saved across crReturn */
5238 c_write_untrusted(ssh
, s
->pwprompt
, strlen(s
->pwprompt
));
5241 setup_userpass_input(ssh
, s
->password
,
5242 sizeof(s
->password
), s
->echo
);
5244 crWaitUntilV(!ispkt
);
5245 ret
= process_userpass_input(ssh
, in
, inlen
);
5249 c_write_str(ssh
, "\r\n");
5253 if (s
->method
== AUTH_PUBLICKEY_FILE
) {
5255 * We have our passphrase. Now try the actual authentication.
5257 struct ssh2_userkey
*key
;
5258 const char *error
= NULL
;
5260 key
= ssh2_load_userkey(&ssh
->cfg
.keyfile
, s
->password
,
5262 if (key
== SSH2_WRONG_PASSPHRASE
|| key
== NULL
) {
5263 if (key
== SSH2_WRONG_PASSPHRASE
) {
5264 c_write_str(ssh
, "Wrong passphrase\r\n");
5265 s
->tried_pubkey_config
= FALSE
;
5267 c_write_str(ssh
, "Unable to load private key (");
5268 c_write_str(ssh
, error
);
5269 c_write_str(ssh
, ")\r\n");
5270 s
->tried_pubkey_config
= TRUE
;
5272 /* Send a spurious AUTH_NONE to return to the top. */
5273 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
5274 ssh2_pkt_addstring(ssh
, s
->username
);
5275 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
5276 ssh2_pkt_addstring(ssh
, "none"); /* method */
5278 s
->type
= AUTH_TYPE_NONE
;
5280 unsigned char *pkblob
, *sigblob
, *sigdata
;
5281 int pkblob_len
, sigblob_len
, sigdata_len
;
5285 * We have loaded the private key and the server
5286 * has announced that it's willing to accept it.
5287 * Hallelujah. Generate a signature and send it.
5289 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
5290 ssh2_pkt_addstring(ssh
, s
->username
);
5291 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
5292 ssh2_pkt_addstring(ssh
, "publickey"); /* method */
5293 ssh2_pkt_addbool(ssh
, TRUE
);
5294 ssh2_pkt_addstring(ssh
, key
->alg
->name
);
5295 pkblob
= key
->alg
->public_blob(key
->data
, &pkblob_len
);
5296 ssh2_pkt_addstring_start(ssh
);
5297 ssh2_pkt_addstring_data(ssh
, (char *)pkblob
, pkblob_len
);
5300 * The data to be signed is:
5304 * followed by everything so far placed in the
5307 sigdata_len
= ssh
->pktout
.length
- 5 + 4 + 20;
5308 if (ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)
5310 sigdata
= snewn(sigdata_len
, unsigned char);
5312 if (!(ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)) {
5313 PUT_32BIT(sigdata
+p
, 20);
5316 memcpy(sigdata
+p
, ssh
->v2_session_id
, 20); p
+= 20;
5317 memcpy(sigdata
+p
, ssh
->pktout
.data
+ 5,
5318 ssh
->pktout
.length
- 5);
5319 p
+= ssh
->pktout
.length
- 5;
5320 assert(p
== sigdata_len
);
5321 sigblob
= key
->alg
->sign(key
->data
, (char *)sigdata
,
5322 sigdata_len
, &sigblob_len
);
5323 ssh2_add_sigblob(ssh
, pkblob
, pkblob_len
,
5324 sigblob
, sigblob_len
);
5330 s
->type
= AUTH_TYPE_PUBLICKEY
;
5331 key
->alg
->freekey(key
->data
);
5333 } else if (s
->method
== AUTH_PASSWORD
) {
5335 * We send the password packet lumped tightly together with
5336 * an SSH_MSG_IGNORE packet. The IGNORE packet contains a
5337 * string long enough to make the total length of the two
5338 * packets constant. This should ensure that a passive
5339 * listener doing traffic analyis can't work out the length
5342 * For this to work, we need an assumption about the
5343 * maximum length of the password packet. I think 256 is
5344 * pretty conservative. Anyone using a password longer than
5345 * that probably doesn't have much to worry about from
5346 * people who find out how long their password is!
5348 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
5349 ssh2_pkt_addstring(ssh
, s
->username
);
5350 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
5351 ssh2_pkt_addstring(ssh
, "password");
5352 ssh2_pkt_addbool(ssh
, FALSE
);
5353 ssh2_pkt_addstring(ssh
, s
->password
);
5354 memset(s
->password
, 0, sizeof(s
->password
));
5355 ssh2_pkt_defer(ssh
);
5357 * We'll include a string that's an exact multiple of the
5358 * cipher block size. If the cipher is NULL for some
5359 * reason, we don't do this trick at all because we gain
5362 if (ssh
->cscipher
) {
5365 stringlen
= (256 - ssh
->deferred_len
);
5366 stringlen
+= ssh
->cscipher
->blksize
- 1;
5367 stringlen
-= (stringlen
% ssh
->cscipher
->blksize
);
5370 * Temporarily disable actual compression,
5371 * so we can guarantee to get this string
5372 * exactly the length we want it. The
5373 * compression-disabling routine should
5374 * return an integer indicating how many
5375 * bytes we should adjust our string length
5379 ssh
->cscomp
->disable_compression(ssh
->cs_comp_ctx
);
5381 ssh2_pkt_init(ssh
, SSH2_MSG_IGNORE
);
5382 ssh2_pkt_addstring_start(ssh
);
5383 for (i
= 0; i
< stringlen
; i
++) {
5384 char c
= (char) random_byte();
5385 ssh2_pkt_addstring_data(ssh
, &c
, 1);
5387 ssh2_pkt_defer(ssh
);
5389 ssh_pkt_defersend(ssh
);
5390 logevent("Sent password");
5391 s
->type
= AUTH_TYPE_PASSWORD
;
5392 } else if (s
->method
== AUTH_KEYBOARD_INTERACTIVE
) {
5393 if (s
->curr_prompt
== 0) {
5394 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_INFO_RESPONSE
);
5395 ssh2_pkt_adduint32(ssh
, s
->num_prompts
);
5397 if (s
->need_pw
) { /* only add pw if we just got one! */
5398 ssh2_pkt_addstring(ssh
, s
->password
);
5399 memset(s
->password
, 0, sizeof(s
->password
));
5402 if (s
->curr_prompt
>= s
->num_prompts
) {
5406 * If there are prompts remaining, we set
5407 * `gotit' so that we won't attempt to get
5408 * another packet. Then we go back round the
5409 * loop and will end up retrieving another
5410 * prompt out of the existing packet. Funky or
5415 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
5417 c_write_str(ssh
, "No supported authentication methods"
5418 " left to try!\r\n");
5419 logevent("No supported authentications offered."
5421 ssh2_pkt_init(ssh
, SSH2_MSG_DISCONNECT
);
5422 ssh2_pkt_adduint32(ssh
, SSH2_DISCONNECT_BY_APPLICATION
);
5423 ssh2_pkt_addstring(ssh
, "No supported authentication"
5424 " methods available");
5425 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
5427 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5431 } while (!s
->we_are_in
);
5434 * Now we're authenticated for the connection protocol. The
5435 * connection protocol will automatically have started at this
5436 * point; there's no need to send SERVICE_REQUEST.
5440 * So now create a channel with a session in it.
5442 ssh
->channels
= newtree234(ssh_channelcmp
);
5443 ssh
->mainchan
= snew(struct ssh_channel
);
5444 ssh
->mainchan
->ssh
= ssh
;
5445 ssh
->mainchan
->localid
= alloc_channel_id(ssh
);
5446 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_OPEN
);
5447 ssh2_pkt_addstring(ssh
, "session");
5448 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->localid
);
5449 ssh
->mainchan
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
5450 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->v
.v2
.locwindow
);/* our window size */
5451 ssh2_pkt_adduint32(ssh
, 0x4000UL
); /* our max pkt size */
5453 crWaitUntilV(ispkt
);
5454 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
5455 bombout(("Server refused to open a session"));
5457 /* FIXME: error data comes back in FAILURE packet */
5459 if (ssh_pkt_getuint32(ssh
) != ssh
->mainchan
->localid
) {
5460 bombout(("Server's channel confirmation cited wrong channel"));
5463 ssh
->mainchan
->remoteid
= ssh_pkt_getuint32(ssh
);
5464 ssh
->mainchan
->type
= CHAN_MAINSESSION
;
5465 ssh
->mainchan
->closes
= 0;
5466 ssh
->mainchan
->v
.v2
.remwindow
= ssh_pkt_getuint32(ssh
);
5467 ssh
->mainchan
->v
.v2
.remmaxpkt
= ssh_pkt_getuint32(ssh
);
5468 bufchain_init(&ssh
->mainchan
->v
.v2
.outbuffer
);
5469 add234(ssh
->channels
, ssh
->mainchan
);
5470 logevent("Opened channel for session");
5473 * Potentially enable X11 forwarding.
5475 if (ssh
->cfg
.x11_forward
) {
5476 char proto
[20], data
[64];
5477 logevent("Requesting X11 forwarding");
5478 ssh
->x11auth
= x11_invent_auth(proto
, sizeof(proto
),
5479 data
, sizeof(data
), ssh
->cfg
.x11_auth
);
5480 x11_get_real_auth(ssh
->x11auth
, ssh
->cfg
.x11_display
);
5481 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5482 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
5483 ssh2_pkt_addstring(ssh
, "x11-req");
5484 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5485 ssh2_pkt_addbool(ssh
, 0); /* many connections */
5486 ssh2_pkt_addstring(ssh
, proto
);
5487 ssh2_pkt_addstring(ssh
, data
);
5488 ssh2_pkt_adduint32(ssh
, x11_get_screen_number(ssh
->cfg
.x11_display
));
5492 crWaitUntilV(ispkt
);
5493 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5494 unsigned i
= ssh_pkt_getuint32(ssh
);
5495 struct ssh_channel
*c
;
5496 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5498 continue; /* nonexistent channel */
5499 c
->v
.v2
.remwindow
+= ssh_pkt_getuint32(ssh
);
5501 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5503 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
5504 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
5505 bombout(("Unexpected response to X11 forwarding request:"
5506 " packet type %d", ssh
->pktin
.type
));
5509 logevent("X11 forwarding refused");
5511 logevent("X11 forwarding enabled");
5512 ssh
->X11_fwd_enabled
= TRUE
;
5517 * Enable port forwardings.
5522 int sport
,dport
,sserv
,dserv
;
5523 char sports
[256], dports
[256], saddr
[256], host
[256];
5525 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh2
);
5526 /* Add port forwardings. */
5527 ssh
->portfwd_strptr
= ssh
->cfg
.portfwd
;
5528 while (*ssh
->portfwd_strptr
) {
5529 type
= *ssh
->portfwd_strptr
++;
5532 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= '\t') {
5533 if (*ssh
->portfwd_strptr
== ':') {
5535 * We've seen a colon in the middle of the
5536 * source port number. This means that
5537 * everything we've seen until now is the
5538 * source _address_, so we'll move it into
5539 * saddr and start sports from the beginning
5542 ssh
->portfwd_strptr
++;
5544 strcpy(saddr
, sports
);
5547 if (n
< 255) sports
[n
++] = *ssh
->portfwd_strptr
++;
5551 if (*ssh
->portfwd_strptr
== '\t')
5552 ssh
->portfwd_strptr
++;
5554 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= ':') {
5555 if (n
< 255) host
[n
++] = *ssh
->portfwd_strptr
++;
5558 if (*ssh
->portfwd_strptr
== ':')
5559 ssh
->portfwd_strptr
++;
5561 while (*ssh
->portfwd_strptr
) {
5562 if (n
< 255) dports
[n
++] = *ssh
->portfwd_strptr
++;
5565 ssh
->portfwd_strptr
++;
5566 dport
= atoi(dports
);
5570 dport
= net_service_lookup(dports
);
5572 logeventf(ssh
, "Service lookup failed for destination"
5573 " port \"%s\"", dports
);
5577 while (*ssh
->portfwd_strptr
) ssh
->portfwd_strptr
++;
5579 ssh
->portfwd_strptr
++; /* eat the NUL and move to next one */
5581 sport
= atoi(sports
);
5585 sport
= net_service_lookup(sports
);
5587 logeventf(ssh
, "Service lookup failed for source"
5588 " port \"%s\"", sports
);
5591 if (sport
&& dport
) {
5593 pfd_addforward(host
, dport
, *saddr ? saddr
: NULL
,
5594 sport
, ssh
, &ssh
->cfg
);
5595 logeventf(ssh
, "Local port %.*s%.*s%.*s%.*s%d%.*s"
5596 " forwarding to %s:%.*s%.*s%d%.*s",
5597 (int)(*saddr?
strlen(saddr
):0), *saddr?saddr
:NULL
,
5598 (int)(*saddr?
1:0), ":",
5599 (int)(sserv ?
strlen(sports
) : 0), sports
,
5600 sserv
, "(", sport
, sserv
, ")",
5602 (int)(dserv ?
strlen(dports
) : 0), dports
,
5603 dserv
, "(", dport
, dserv
, ")");
5604 } else if (type
== 'D') {
5605 pfd_addforward(NULL
, -1, *saddr ? saddr
: NULL
,
5606 sport
, ssh
, &ssh
->cfg
);
5607 logeventf(ssh
, "Local port %.*s%.*s%.*s%.*s%d%.*s"
5608 " doing SOCKS dynamic forwarding",
5609 (int)(*saddr?
strlen(saddr
):0), *saddr?saddr
:NULL
,
5610 (int)(*saddr?
1:0), ":",
5611 (int)(sserv ?
strlen(sports
) : 0), sports
,
5612 sserv
, "(", sport
, sserv
, ")");
5614 struct ssh_rportfwd
*pf
;
5615 pf
= snew(struct ssh_rportfwd
);
5616 strcpy(pf
->dhost
, host
);
5619 if (add234(ssh
->rportfwds
, pf
) != pf
) {
5620 logeventf(ssh
, "Duplicate remote port forwarding"
5621 " to %s:%d", host
, dport
);
5624 logeventf(ssh
, "Requesting remote port "
5625 "%.*s%.*s%.*s%.*s%d%.*s"
5626 " forward to %s:%.*s%.*s%d%.*s",
5627 (int)(*saddr?
strlen(saddr
):0),
5629 (int)(*saddr?
1:0), ":",
5630 (int)(sserv ?
strlen(sports
) : 0), sports
,
5631 sserv
, "(", sport
, sserv
, ")",
5633 (int)(dserv ?
strlen(dports
) : 0), dports
,
5634 dserv
, "(", dport
, dserv
, ")");
5635 ssh2_pkt_init(ssh
, SSH2_MSG_GLOBAL_REQUEST
);
5636 ssh2_pkt_addstring(ssh
, "tcpip-forward");
5637 ssh2_pkt_addbool(ssh
, 1);/* want reply */
5639 ssh2_pkt_addstring(ssh
, saddr
);
5640 if (ssh
->cfg
.rport_acceptall
)
5641 ssh2_pkt_addstring(ssh
, "0.0.0.0");
5643 ssh2_pkt_addstring(ssh
, "127.0.0.1");
5644 ssh2_pkt_adduint32(ssh
, sport
);
5648 crWaitUntilV(ispkt
);
5649 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5650 unsigned i
= ssh_pkt_getuint32(ssh
);
5651 struct ssh_channel
*c
;
5652 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5654 continue;/* nonexistent channel */
5655 c
->v
.v2
.remwindow
+= ssh_pkt_getuint32(ssh
);
5657 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5659 if (ssh
->pktin
.type
!= SSH2_MSG_REQUEST_SUCCESS
) {
5660 if (ssh
->pktin
.type
!= SSH2_MSG_REQUEST_FAILURE
) {
5661 bombout(("Unexpected response to port "
5662 "forwarding request: packet type %d",
5666 logevent("Server refused this port forwarding");
5668 logevent("Remote port forwarding enabled");
5677 * Potentially enable agent forwarding.
5679 if (ssh
->cfg
.agentfwd
&& agent_exists()) {
5680 logevent("Requesting OpenSSH-style agent forwarding");
5681 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5682 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
5683 ssh2_pkt_addstring(ssh
, "auth-agent-req@openssh.com");
5684 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5688 crWaitUntilV(ispkt
);
5689 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5690 unsigned i
= ssh_pkt_getuint32(ssh
);
5691 struct ssh_channel
*c
;
5692 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5694 continue; /* nonexistent channel */
5695 c
->v
.v2
.remwindow
+= ssh_pkt_getuint32(ssh
);
5697 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5699 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
5700 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
5701 bombout(("Unexpected response to agent forwarding request:"
5702 " packet type %d", ssh
->pktin
.type
));
5705 logevent("Agent forwarding refused");
5707 logevent("Agent forwarding enabled");
5708 ssh
->agentfwd_enabled
= TRUE
;
5713 * Now allocate a pty for the session.
5715 if (!ssh
->cfg
.nopty
) {
5716 /* Unpick the terminal-speed string. */
5717 /* XXX perhaps we should allow no speeds to be sent. */
5718 ssh
->ospeed
= 38400; ssh
->ispeed
= 38400; /* last-resort defaults */
5719 sscanf(ssh
->cfg
.termspeed
, "%d,%d", &ssh
->ospeed
, &ssh
->ispeed
);
5720 /* Build the pty request. */
5721 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5722 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
); /* recipient channel */
5723 ssh2_pkt_addstring(ssh
, "pty-req");
5724 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5725 ssh2_pkt_addstring(ssh
, ssh
->cfg
.termtype
);
5726 ssh2_pkt_adduint32(ssh
, ssh
->term_width
);
5727 ssh2_pkt_adduint32(ssh
, ssh
->term_height
);
5728 ssh2_pkt_adduint32(ssh
, 0); /* pixel width */
5729 ssh2_pkt_adduint32(ssh
, 0); /* pixel height */
5730 ssh2_pkt_addstring_start(ssh
);
5731 ssh2_pkt_addbyte(ssh
, 128); /* TTY_OP_ISPEED */
5732 ssh2_pkt_adduint32(ssh
, ssh
->ispeed
);
5733 ssh2_pkt_addbyte(ssh
, 129); /* TTY_OP_OSPEED */
5734 ssh2_pkt_adduint32(ssh
, ssh
->ospeed
);
5735 ssh2_pkt_addstring_data(ssh
, "\0", 1); /* TTY_OP_END */
5737 ssh
->state
= SSH_STATE_INTERMED
;
5740 crWaitUntilV(ispkt
);
5741 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5742 unsigned i
= ssh_pkt_getuint32(ssh
);
5743 struct ssh_channel
*c
;
5744 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5746 continue; /* nonexistent channel */
5747 c
->v
.v2
.remwindow
+= ssh_pkt_getuint32(ssh
);
5749 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5751 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
5752 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
5753 bombout(("Unexpected response to pty request:"
5754 " packet type %d", ssh
->pktin
.type
));
5757 c_write_str(ssh
, "Server refused to allocate pty\r\n");
5758 ssh
->editing
= ssh
->echoing
= 1;
5760 logeventf(ssh
, "Allocated pty (ospeed %dbps, ispeed %dbps)",
5761 ssh
->ospeed
, ssh
->ispeed
);
5764 ssh
->editing
= ssh
->echoing
= 1;
5768 * Start a shell or a remote command. We may have to attempt
5769 * this twice if the config data has provided a second choice
5776 if (ssh
->fallback_cmd
) {
5777 subsys
= ssh
->cfg
.ssh_subsys2
;
5778 cmd
= ssh
->cfg
.remote_cmd_ptr2
;
5780 subsys
= ssh
->cfg
.ssh_subsys
;
5781 cmd
= ssh
->cfg
.remote_cmd_ptr
;
5784 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5785 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
); /* recipient channel */
5787 ssh2_pkt_addstring(ssh
, "subsystem");
5788 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5789 ssh2_pkt_addstring(ssh
, cmd
);
5791 ssh2_pkt_addstring(ssh
, "exec");
5792 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5793 ssh2_pkt_addstring(ssh
, cmd
);
5795 ssh2_pkt_addstring(ssh
, "shell");
5796 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5800 crWaitUntilV(ispkt
);
5801 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5802 unsigned i
= ssh_pkt_getuint32(ssh
);
5803 struct ssh_channel
*c
;
5804 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5806 continue; /* nonexistent channel */
5807 c
->v
.v2
.remwindow
+= ssh_pkt_getuint32(ssh
);
5809 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5810 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
5811 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
5812 bombout(("Unexpected response to shell/command request:"
5813 " packet type %d", ssh
->pktin
.type
));
5817 * We failed to start the command. If this is the
5818 * fallback command, we really are finished; if it's
5819 * not, and if the fallback command exists, try falling
5820 * back to it before complaining.
5822 if (!ssh
->fallback_cmd
&& ssh
->cfg
.remote_cmd_ptr2
!= NULL
) {
5823 logevent("Primary command failed; attempting fallback");
5824 ssh
->fallback_cmd
= TRUE
;
5827 bombout(("Server refused to start a shell/command"));
5830 logevent("Started a shell/command");
5835 ssh
->state
= SSH_STATE_SESSION
;
5836 if (ssh
->size_needed
)
5837 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
5838 if (ssh
->eof_needed
)
5839 ssh_special(ssh
, TS_EOF
);
5845 ldisc_send(ssh
->ldisc
, NULL
, 0, 0);/* cause ldisc to notice changes */
5849 s
->try_send
= FALSE
;
5851 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_DATA
||
5852 ssh
->pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
) {
5855 unsigned i
= ssh_pkt_getuint32(ssh
);
5856 struct ssh_channel
*c
;
5857 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5859 continue; /* nonexistent channel */
5860 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
&&
5861 ssh_pkt_getuint32(ssh
) != SSH2_EXTENDED_DATA_STDERR
)
5862 continue; /* extended but not stderr */
5863 ssh_pkt_getstring(ssh
, &data
, &length
);
5866 c
->v
.v2
.locwindow
-= length
;
5868 case CHAN_MAINSESSION
:
5870 from_backend(ssh
->frontend
, ssh
->pktin
.type
==
5871 SSH2_MSG_CHANNEL_EXTENDED_DATA
,
5875 bufsize
= x11_send(c
->u
.x11
.s
, data
, length
);
5878 bufsize
= pfd_send(c
->u
.pfd
.s
, data
, length
);
5881 while (length
> 0) {
5882 if (c
->u
.a
.lensofar
< 4) {
5883 int l
= min(4 - c
->u
.a
.lensofar
, length
);
5884 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
,
5888 c
->u
.a
.lensofar
+= l
;
5890 if (c
->u
.a
.lensofar
== 4) {
5892 4 + GET_32BIT(c
->u
.a
.msglen
);
5893 c
->u
.a
.message
= snewn(c
->u
.a
.totallen
,
5895 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
5897 if (c
->u
.a
.lensofar
>= 4 && length
> 0) {
5899 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
5901 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
,
5905 c
->u
.a
.lensofar
+= l
;
5907 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
5910 if (agent_query(c
->u
.a
.message
,
5913 ssh_agentf_callback
, c
))
5914 ssh_agentf_callback(c
, reply
, replylen
);
5915 sfree(c
->u
.a
.message
);
5916 c
->u
.a
.lensofar
= 0;
5923 * If we are not buffering too much data,
5924 * enlarge the window again at the remote side.
5926 if (bufsize
< OUR_V2_WINSIZE
)
5927 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
5929 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_EOF
) {
5930 unsigned i
= ssh_pkt_getuint32(ssh
);
5931 struct ssh_channel
*c
;
5933 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5935 continue; /* nonexistent channel */
5937 if (c
->type
== CHAN_X11
) {
5939 * Remote EOF on an X11 channel means we should
5940 * wrap up and close the channel ourselves.
5942 x11_close(c
->u
.x11
.s
);
5944 } else if (c
->type
== CHAN_AGENT
) {
5946 } else if (c
->type
== CHAN_SOCKDATA
) {
5947 pfd_close(c
->u
.pfd
.s
);
5950 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_CLOSE
) {
5951 unsigned i
= ssh_pkt_getuint32(ssh
);
5952 struct ssh_channel
*c
;
5954 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5955 if (!c
|| ((int)c
->remoteid
) == -1) {
5956 bombout(("Received CHANNEL_CLOSE for %s channel %d\n",
5957 c ?
"half-open" : "nonexistent", i
));
5960 /* Do pre-close processing on the channel. */
5962 case CHAN_MAINSESSION
:
5963 break; /* nothing to see here, move along */
5965 if (c
->u
.x11
.s
!= NULL
)
5966 x11_close(c
->u
.x11
.s
);
5973 if (c
->u
.pfd
.s
!= NULL
)
5974 pfd_close(c
->u
.pfd
.s
);
5978 if (c
->closes
== 0) {
5979 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_CLOSE
);
5980 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
5983 del234(ssh
->channels
, c
);
5984 bufchain_clear(&c
->v
.v2
.outbuffer
);
5988 * See if that was the last channel left open.
5990 if (count234(ssh
->channels
) == 0) {
5991 logevent("All channels closed. Disconnecting");
5994 * We used to send SSH_MSG_DISCONNECT here,
5995 * because I'd believed that _every_ conforming
5996 * SSH2 connection had to end with a disconnect
5997 * being sent by at least one side; apparently
5998 * I was wrong and it's perfectly OK to
5999 * unceremoniously slam the connection shut
6000 * when you're done, and indeed OpenSSH feels
6001 * this is more polite than sending a
6002 * DISCONNECT. So now we don't.
6004 ssh2_pkt_init(ssh
, SSH2_MSG_DISCONNECT
);
6005 ssh2_pkt_adduint32(ssh
, SSH2_DISCONNECT_BY_APPLICATION
);
6006 ssh2_pkt_addstring(ssh
, "All open channels closed");
6007 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
6010 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6013 continue; /* remote sends close; ignore (FIXME) */
6014 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
6015 unsigned i
= ssh_pkt_getuint32(ssh
);
6016 struct ssh_channel
*c
;
6017 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
6018 if (!c
|| c
->closes
)
6019 continue; /* nonexistent or closing channel */
6020 c
->v
.v2
.remwindow
+= ssh_pkt_getuint32(ssh
);
6022 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
6023 unsigned i
= ssh_pkt_getuint32(ssh
);
6024 struct ssh_channel
*c
;
6025 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
6027 continue; /* nonexistent channel */
6028 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
6029 continue; /* dunno why they're confirming this */
6030 c
->remoteid
= ssh_pkt_getuint32(ssh
);
6031 c
->type
= CHAN_SOCKDATA
;
6032 c
->v
.v2
.remwindow
= ssh_pkt_getuint32(ssh
);
6033 c
->v
.v2
.remmaxpkt
= ssh_pkt_getuint32(ssh
);
6035 pfd_confirm(c
->u
.pfd
.s
);
6038 * We have a pending close on this channel,
6039 * which we decided on before the server acked
6040 * the channel open. So now we know the
6041 * remoteid, we can close it again.
6043 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_CLOSE
);
6044 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
6047 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_OPEN_FAILURE
) {
6048 unsigned i
= ssh_pkt_getuint32(ssh
);
6049 struct ssh_channel
*c
;
6050 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
6052 continue; /* nonexistent channel */
6053 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
6054 continue; /* dunno why they're failing this */
6056 logevent("Forwarded connection refused by server");
6058 pfd_close(c
->u
.pfd
.s
);
6060 del234(ssh
->channels
, c
);
6062 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_REQUEST
) {
6065 int typelen
, want_reply
;
6066 struct ssh_channel
*c
;
6068 localid
= ssh_pkt_getuint32(ssh
);
6069 ssh_pkt_getstring(ssh
, &type
, &typelen
);
6070 want_reply
= ssh2_pkt_getbool(ssh
);
6073 * First, check that the channel exists. Otherwise,
6074 * we can instantly disconnect with a rude message.
6076 c
= find234(ssh
->channels
, &localid
, ssh_channelfind
);
6079 sprintf(buf
, "Received channel request for nonexistent"
6080 " channel %d", localid
);
6082 ssh2_pkt_init(ssh
, SSH2_MSG_DISCONNECT
);
6083 ssh2_pkt_adduint32(ssh
, SSH2_DISCONNECT_BY_APPLICATION
);
6084 ssh2_pkt_addstring(ssh
, buf
);
6085 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
6087 connection_fatal(ssh
->frontend
, "%s", buf
);
6088 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6093 * Having got the channel number, we now look at
6094 * the request type string to see if it's something
6097 if (typelen
== 11 && !memcmp(type
, "exit-status", 11) &&
6098 c
== ssh
->mainchan
) {
6099 /* We recognise "exit-status" on the primary channel. */
6101 ssh
->exitcode
= ssh_pkt_getuint32(ssh
);
6102 sprintf(buf
, "Server sent command exit status %d",
6106 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_SUCCESS
);
6107 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
6112 * This is a channel request we don't know
6113 * about, so we now either ignore the request
6114 * or respond with CHANNEL_FAILURE, depending
6118 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_FAILURE
);
6119 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
6123 } else if (ssh
->pktin
.type
== SSH2_MSG_GLOBAL_REQUEST
) {
6125 int typelen
, want_reply
;
6127 ssh_pkt_getstring(ssh
, &type
, &typelen
);
6128 want_reply
= ssh2_pkt_getbool(ssh
);
6131 * We currently don't support any global requests
6132 * at all, so we either ignore the request or
6133 * respond with REQUEST_FAILURE, depending on
6137 ssh2_pkt_init(ssh
, SSH2_MSG_REQUEST_FAILURE
);
6140 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_OPEN
) {
6147 struct ssh_channel
*c
;
6148 unsigned remid
, winsize
, pktsize
;
6149 ssh_pkt_getstring(ssh
, &type
, &typelen
);
6150 c
= snew(struct ssh_channel
);
6153 remid
= ssh_pkt_getuint32(ssh
);
6154 winsize
= ssh_pkt_getuint32(ssh
);
6155 pktsize
= ssh_pkt_getuint32(ssh
);
6157 if (typelen
== 3 && !memcmp(type
, "x11", 3)) {
6160 ssh_pkt_getstring(ssh
, &peeraddr
, &peeraddrlen
);
6161 addrstr
= snewn(peeraddrlen
+1, char);
6162 memcpy(addrstr
, peeraddr
, peeraddrlen
);
6163 peeraddr
[peeraddrlen
] = '\0';
6164 peerport
= ssh_pkt_getuint32(ssh
);
6166 if (!ssh
->X11_fwd_enabled
)
6167 error
= "X11 forwarding is not enabled";
6168 else if (x11_init(&c
->u
.x11
.s
, ssh
->cfg
.x11_display
, c
,
6169 ssh
->x11auth
, addrstr
, peerport
,
6170 &ssh
->cfg
) != NULL
) {
6171 error
= "Unable to open an X11 connection";
6177 } else if (typelen
== 15 &&
6178 !memcmp(type
, "forwarded-tcpip", 15)) {
6179 struct ssh_rportfwd pf
, *realpf
;
6182 ssh_pkt_getstring(ssh
, &dummy
, &dummylen
);/* skip address */
6183 pf
.sport
= ssh_pkt_getuint32(ssh
);
6184 ssh_pkt_getstring(ssh
, &peeraddr
, &peeraddrlen
);
6185 peerport
= ssh_pkt_getuint32(ssh
);
6186 realpf
= find234(ssh
->rportfwds
, &pf
, NULL
);
6187 if (realpf
== NULL
) {
6188 error
= "Remote port is not recognised";
6190 const char *e
= pfd_newconnect(&c
->u
.pfd
.s
,
6194 logeventf(ssh
, "Received remote port open request"
6195 " for %s:%d", realpf
->dhost
, realpf
->dport
);
6197 logeventf(ssh
, "Port open failed: %s", e
);
6198 error
= "Port open failed";
6200 logevent("Forwarded port opened successfully");
6201 c
->type
= CHAN_SOCKDATA
;
6204 } else if (typelen
== 22 &&
6205 !memcmp(type
, "auth-agent@openssh.com", 3)) {
6206 if (!ssh
->agentfwd_enabled
)
6207 error
= "Agent forwarding is not enabled";
6209 c
->type
= CHAN_AGENT
; /* identify channel type */
6210 c
->u
.a
.lensofar
= 0;
6213 error
= "Unsupported channel type requested";
6216 c
->remoteid
= remid
;
6218 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_OPEN_FAILURE
);
6219 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
6220 ssh2_pkt_adduint32(ssh
, SSH2_OPEN_CONNECT_FAILED
);
6221 ssh2_pkt_addstring(ssh
, error
);
6222 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
6226 c
->localid
= alloc_channel_id(ssh
);
6228 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
6229 c
->v
.v2
.remwindow
= winsize
;
6230 c
->v
.v2
.remmaxpkt
= pktsize
;
6231 bufchain_init(&c
->v
.v2
.outbuffer
);
6232 add234(ssh
->channels
, c
);
6233 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
);
6234 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
6235 ssh2_pkt_adduint32(ssh
, c
->localid
);
6236 ssh2_pkt_adduint32(ssh
, c
->v
.v2
.locwindow
);
6237 ssh2_pkt_adduint32(ssh
, 0x4000UL
); /* our max pkt size */
6241 bombout(("Strange packet received: type %d", ssh
->pktin
.type
));
6246 * We have spare data. Add it to the channel buffer.
6248 ssh2_add_channel_data(ssh
->mainchan
, (char *)in
, inlen
);
6253 struct ssh_channel
*c
;
6255 * Try to send data on all channels if we can.
6257 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
6260 continue; /* don't send on closing channels */
6261 bufsize
= ssh2_try_send(c
);
6264 case CHAN_MAINSESSION
:
6265 /* stdin need not receive an unthrottle
6266 * notification since it will be polled */
6269 x11_unthrottle(c
->u
.x11
.s
);
6272 /* agent sockets are request/response and need no
6273 * buffer management */
6276 pfd_unthrottle(c
->u
.pfd
.s
);
6288 * Handle the top-level SSH2 protocol.
6290 static void ssh2_protocol(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
6292 if (do_ssh2_transport(ssh
, in
, inlen
, ispkt
) == 0)
6294 do_ssh2_authconn(ssh
, in
, inlen
, ispkt
);
6298 * Called to set up the connection.
6300 * Returns an error message, or NULL on success.
6302 static const char *ssh_init(void *frontend_handle
, void **backend_handle
,
6304 char *host
, int port
, char **realhost
, int nodelay
,
6310 ssh
= snew(struct ssh_tag
);
6311 ssh
->cfg
= *cfg
; /* STRUCTURE COPY */
6312 ssh
->version
= 0; /* when not ready yet */
6315 ssh
->v1_cipher_ctx
= NULL
;
6316 ssh
->crcda_ctx
= NULL
;
6317 ssh
->cscipher
= NULL
;
6318 ssh
->cs_cipher_ctx
= NULL
;
6319 ssh
->sccipher
= NULL
;
6320 ssh
->sc_cipher_ctx
= NULL
;
6322 ssh
->cs_mac_ctx
= NULL
;
6324 ssh
->sc_mac_ctx
= NULL
;
6326 ssh
->cs_comp_ctx
= NULL
;
6328 ssh
->sc_comp_ctx
= NULL
;
6330 ssh
->kex_ctx
= NULL
;
6331 ssh
->hostkey
= NULL
;
6333 ssh
->state
= SSH_STATE_PREPACKET
;
6334 ssh
->size_needed
= FALSE
;
6335 ssh
->eof_needed
= FALSE
;
6339 static const struct Packet empty
= { 0, 0, NULL
, NULL
, 0 };
6340 ssh
->pktin
= ssh
->pktout
= empty
;
6342 ssh
->deferred_send_data
= NULL
;
6343 ssh
->deferred_len
= 0;
6344 ssh
->deferred_size
= 0;
6345 ssh
->fallback_cmd
= 0;
6347 ssh
->x11auth
= NULL
;
6348 ssh
->v1_compressing
= FALSE
;
6349 ssh
->v2_outgoing_sequence
= 0;
6350 ssh
->ssh1_rdpkt_crstate
= 0;
6351 ssh
->ssh2_rdpkt_crstate
= 0;
6352 ssh
->do_ssh_init_crstate
= 0;
6353 ssh
->ssh_gotdata_crstate
= 0;
6354 ssh
->ssh1_protocol_crstate
= 0;
6355 ssh
->do_ssh1_login_crstate
= 0;
6356 ssh
->do_ssh2_transport_crstate
= 0;
6357 ssh
->do_ssh2_authconn_crstate
= 0;
6358 ssh
->do_ssh_init_state
= NULL
;
6359 ssh
->do_ssh1_login_state
= NULL
;
6360 ssh
->do_ssh2_transport_state
= NULL
;
6361 ssh
->do_ssh2_authconn_state
= NULL
;
6362 ssh
->mainchan
= NULL
;
6363 ssh
->throttled_all
= 0;
6364 ssh
->v1_stdout_throttling
= 0;
6366 *backend_handle
= ssh
;
6369 if (crypto_startup() == 0)
6370 return "Microsoft high encryption pack not installed!";
6373 ssh
->frontend
= frontend_handle
;
6374 ssh
->term_width
= ssh
->cfg
.width
;
6375 ssh
->term_height
= ssh
->cfg
.height
;
6377 ssh
->channels
= NULL
;
6378 ssh
->rportfwds
= NULL
;
6383 ssh
->v1_throttle_count
= 0;
6384 ssh
->overall_bufsize
= 0;
6385 ssh
->fallback_cmd
= 0;
6387 ssh
->protocol
= NULL
;
6389 p
= connect_to_host(ssh
, host
, port
, realhost
, nodelay
, keepalive
);
6396 static void ssh_free(void *handle
)
6398 Ssh ssh
= (Ssh
) handle
;
6399 struct ssh_channel
*c
;
6400 struct ssh_rportfwd
*pf
;
6402 if (ssh
->v1_cipher_ctx
)
6403 ssh
->cipher
->free_context(ssh
->v1_cipher_ctx
);
6404 if (ssh
->cs_cipher_ctx
)
6405 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
6406 if (ssh
->sc_cipher_ctx
)
6407 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
6408 if (ssh
->cs_mac_ctx
)
6409 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
6410 if (ssh
->sc_mac_ctx
)
6411 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
6412 if (ssh
->cs_comp_ctx
) {
6414 ssh
->cscomp
->compress_cleanup(ssh
->cs_comp_ctx
);
6416 zlib_compress_cleanup(ssh
->cs_comp_ctx
);
6418 if (ssh
->sc_comp_ctx
) {
6420 ssh
->sccomp
->decompress_cleanup(ssh
->sc_comp_ctx
);
6422 zlib_decompress_cleanup(ssh
->sc_comp_ctx
);
6425 dh_cleanup(ssh
->kex_ctx
);
6426 sfree(ssh
->savedhost
);
6428 if (ssh
->channels
) {
6429 while ((c
= delpos234(ssh
->channels
, 0)) != NULL
) {
6432 if (c
->u
.x11
.s
!= NULL
)
6433 x11_close(c
->u
.x11
.s
);
6436 if (c
->u
.pfd
.s
!= NULL
)
6437 pfd_close(c
->u
.pfd
.s
);
6442 freetree234(ssh
->channels
);
6445 if (ssh
->rportfwds
) {
6446 while ((pf
= delpos234(ssh
->rportfwds
, 0)) != NULL
)
6448 freetree234(ssh
->rportfwds
);
6450 sfree(ssh
->deferred_send_data
);
6452 x11_free_auth(ssh
->x11auth
);
6453 sfree(ssh
->do_ssh_init_state
);
6454 sfree(ssh
->do_ssh1_login_state
);
6455 sfree(ssh
->do_ssh2_transport_state
);
6456 sfree(ssh
->do_ssh2_authconn_state
);
6457 if (ssh
->pktout
.data
) {
6458 sfree(ssh
->pktout
.data
);
6459 ssh
->pktout
.data
= NULL
;
6461 if (ssh
->pktin
.data
) {
6462 sfree(ssh
->pktin
.data
);
6463 ssh
->pktin
.data
= NULL
;
6465 if (ssh
->crcda_ctx
) {
6466 crcda_free_context(ssh
->crcda_ctx
);
6467 ssh
->crcda_ctx
= NULL
;
6470 log_free(ssh
->logctx
);
6479 * Reconfigure the SSH backend.
6481 * Currently, this function does nothing very useful. In future,
6482 * however, we could do some handy things with it. For example, we
6483 * could make the port forwarding configurer active in the Change
6484 * Settings box, and this routine could close down existing
6485 * forwardings and open up new ones in response to changes.
6487 static void ssh_reconfig(void *handle
, Config
*cfg
)
6489 Ssh ssh
= (Ssh
) handle
;
6490 ssh
->cfg
= *cfg
; /* STRUCTURE COPY */
6494 * Called to send data down the Telnet connection.
6496 static int ssh_send(void *handle
, char *buf
, int len
)
6498 Ssh ssh
= (Ssh
) handle
;
6500 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
6503 ssh
->protocol(ssh
, (unsigned char *)buf
, len
, 0);
6505 return ssh_sendbuffer(ssh
);
6509 * Called to query the current amount of buffered stdin data.
6511 static int ssh_sendbuffer(void *handle
)
6513 Ssh ssh
= (Ssh
) handle
;
6516 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
6520 * If the SSH socket itself has backed up, add the total backup
6521 * size on that to any individual buffer on the stdin channel.
6524 if (ssh
->throttled_all
)
6525 override_value
= ssh
->overall_bufsize
;
6527 if (ssh
->version
== 1) {
6528 return override_value
;
6529 } else if (ssh
->version
== 2) {
6530 if (!ssh
->mainchan
|| ssh
->mainchan
->closes
> 0)
6531 return override_value
;
6533 return (override_value
+
6534 bufchain_size(&ssh
->mainchan
->v
.v2
.outbuffer
));
6541 * Called to set the size of the window from SSH's POV.
6543 static void ssh_size(void *handle
, int width
, int height
)
6545 Ssh ssh
= (Ssh
) handle
;
6547 ssh
->term_width
= width
;
6548 ssh
->term_height
= height
;
6550 switch (ssh
->state
) {
6551 case SSH_STATE_BEFORE_SIZE
:
6552 case SSH_STATE_PREPACKET
:
6553 case SSH_STATE_CLOSED
:
6554 break; /* do nothing */
6555 case SSH_STATE_INTERMED
:
6556 ssh
->size_needed
= TRUE
; /* buffer for later */
6558 case SSH_STATE_SESSION
:
6559 if (!ssh
->cfg
.nopty
) {
6560 if (ssh
->version
== 1) {
6561 send_packet(ssh
, SSH1_CMSG_WINDOW_SIZE
,
6562 PKT_INT
, ssh
->term_height
,
6563 PKT_INT
, ssh
->term_width
,
6564 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
6566 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
6567 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
6568 ssh2_pkt_addstring(ssh
, "window-change");
6569 ssh2_pkt_addbool(ssh
, 0);
6570 ssh2_pkt_adduint32(ssh
, ssh
->term_width
);
6571 ssh2_pkt_adduint32(ssh
, ssh
->term_height
);
6572 ssh2_pkt_adduint32(ssh
, 0);
6573 ssh2_pkt_adduint32(ssh
, 0);
6582 * Return a list of the special codes that make sense in this
6585 static const struct telnet_special
*ssh_get_specials(void *handle
)
6587 Ssh ssh
= (Ssh
) handle
;
6589 if (ssh
->version
== 1) {
6590 static const struct telnet_special ssh1_specials
[] = {
6591 {"IGNORE message", TS_NOP
},
6594 return ssh1_specials
;
6595 } else if (ssh
->version
== 2) {
6596 static const struct telnet_special ssh2_specials
[] = {
6598 {"IGNORE message", TS_NOP
},
6601 return ssh2_specials
;
6607 * Send Telnet special codes. TS_EOF is useful for `plink', so you
6608 * can send an EOF and collect resulting output (e.g. `plink
6611 static void ssh_special(void *handle
, Telnet_Special code
)
6613 Ssh ssh
= (Ssh
) handle
;
6615 if (code
== TS_EOF
) {
6616 if (ssh
->state
!= SSH_STATE_SESSION
) {
6618 * Buffer the EOF in case we are pre-SESSION, so we can
6619 * send it as soon as we reach SESSION.
6622 ssh
->eof_needed
= TRUE
;
6625 if (ssh
->version
== 1) {
6626 send_packet(ssh
, SSH1_CMSG_EOF
, PKT_END
);
6628 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_EOF
);
6629 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
6632 logevent("Sent EOF message");
6633 } else if (code
== TS_PING
|| code
== TS_NOP
) {
6634 if (ssh
->state
== SSH_STATE_CLOSED
6635 || ssh
->state
== SSH_STATE_PREPACKET
) return;
6636 if (ssh
->version
== 1) {
6637 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
))
6638 send_packet(ssh
, SSH1_MSG_IGNORE
, PKT_STR
, "", PKT_END
);
6640 ssh2_pkt_init(ssh
, SSH2_MSG_IGNORE
);
6641 ssh2_pkt_addstring_start(ssh
);
6644 } else if (code
== TS_BRK
) {
6645 if (ssh
->state
== SSH_STATE_CLOSED
6646 || ssh
->state
== SSH_STATE_PREPACKET
) return;
6647 if (ssh
->version
== 1) {
6648 logevent("Unable to send BREAK signal in SSH1");
6650 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
6651 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
6652 ssh2_pkt_addstring(ssh
, "break");
6653 ssh2_pkt_addbool(ssh
, 0);
6654 ssh2_pkt_adduint32(ssh
, 0); /* default break length */
6662 void *new_sock_channel(void *handle
, Socket s
)
6664 Ssh ssh
= (Ssh
) handle
;
6665 struct ssh_channel
*c
;
6666 c
= snew(struct ssh_channel
);
6670 c
->remoteid
= -1; /* to be set when open confirmed */
6671 c
->localid
= alloc_channel_id(ssh
);
6673 c
->type
= CHAN_SOCKDATA_DORMANT
;/* identify channel type */
6675 bufchain_init(&c
->v
.v2
.outbuffer
);
6676 add234(ssh
->channels
, c
);
6682 * This is called when stdout/stderr (the entity to which
6683 * from_backend sends data) manages to clear some backlog.
6685 static void ssh_unthrottle(void *handle
, int bufsize
)
6687 Ssh ssh
= (Ssh
) handle
;
6688 if (ssh
->version
== 1) {
6689 if (ssh
->v1_stdout_throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
6690 ssh
->v1_stdout_throttling
= 0;
6691 ssh1_throttle(ssh
, -1);
6694 if (ssh
->mainchan
&& ssh
->mainchan
->closes
== 0)
6695 ssh2_set_window(ssh
->mainchan
, OUR_V2_WINSIZE
- bufsize
);
6699 void ssh_send_port_open(void *channel
, char *hostname
, int port
, char *org
)
6701 struct ssh_channel
*c
= (struct ssh_channel
*)channel
;
6704 logeventf(ssh
, "Opening forwarded connection to %s:%d", hostname
, port
);
6706 if (ssh
->version
== 1) {
6707 send_packet(ssh
, SSH1_MSG_PORT_OPEN
,
6708 PKT_INT
, c
->localid
,
6711 //PKT_STR, <org:orgport>,
6714 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_OPEN
);
6715 ssh2_pkt_addstring(ssh
, "direct-tcpip");
6716 ssh2_pkt_adduint32(ssh
, c
->localid
);
6717 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
6718 ssh2_pkt_adduint32(ssh
, c
->v
.v2
.locwindow
);/* our window size */
6719 ssh2_pkt_adduint32(ssh
, 0x4000UL
); /* our max pkt size */
6720 ssh2_pkt_addstring(ssh
, hostname
);
6721 ssh2_pkt_adduint32(ssh
, port
);
6723 * We make up values for the originator data; partly it's
6724 * too much hassle to keep track, and partly I'm not
6725 * convinced the server should be told details like that
6726 * about my local network configuration.
6728 ssh2_pkt_addstring(ssh
, "client-side-connection");
6729 ssh2_pkt_adduint32(ssh
, 0);
6735 static Socket
ssh_socket(void *handle
)
6737 Ssh ssh
= (Ssh
) handle
;
6741 static int ssh_sendok(void *handle
)
6743 Ssh ssh
= (Ssh
) handle
;
6744 return ssh
->send_ok
;
6747 static int ssh_ldisc(void *handle
, int option
)
6749 Ssh ssh
= (Ssh
) handle
;
6750 if (option
== LD_ECHO
)
6751 return ssh
->echoing
;
6752 if (option
== LD_EDIT
)
6753 return ssh
->editing
;
6757 static void ssh_provide_ldisc(void *handle
, void *ldisc
)
6759 Ssh ssh
= (Ssh
) handle
;
6763 static void ssh_provide_logctx(void *handle
, void *logctx
)
6765 Ssh ssh
= (Ssh
) handle
;
6766 ssh
->logctx
= logctx
;
6769 static int ssh_return_exitcode(void *handle
)
6771 Ssh ssh
= (Ssh
) handle
;
6775 return (ssh
->exitcode
>= 0 ? ssh
->exitcode
: 0);
6779 * Gross hack: pscp will try to start SFTP but fall back to scp1 if
6780 * that fails. This variable is the means by which scp.c can reach
6781 * into the SSH code and find out which one it got.
6783 extern int ssh_fallback_cmd(void *handle
)
6785 Ssh ssh
= (Ssh
) handle
;
6786 return ssh
->fallback_cmd
;
6789 Backend ssh_backend
= {
6799 ssh_return_exitcode
,