17 #define SSH1_MSG_DISCONNECT 1 /* 0x1 */
18 #define SSH1_SMSG_PUBLIC_KEY 2 /* 0x2 */
19 #define SSH1_CMSG_SESSION_KEY 3 /* 0x3 */
20 #define SSH1_CMSG_USER 4 /* 0x4 */
21 #define SSH1_CMSG_AUTH_RSA 6 /* 0x6 */
22 #define SSH1_SMSG_AUTH_RSA_CHALLENGE 7 /* 0x7 */
23 #define SSH1_CMSG_AUTH_RSA_RESPONSE 8 /* 0x8 */
24 #define SSH1_CMSG_AUTH_PASSWORD 9 /* 0x9 */
25 #define SSH1_CMSG_REQUEST_PTY 10 /* 0xa */
26 #define SSH1_CMSG_WINDOW_SIZE 11 /* 0xb */
27 #define SSH1_CMSG_EXEC_SHELL 12 /* 0xc */
28 #define SSH1_CMSG_EXEC_CMD 13 /* 0xd */
29 #define SSH1_SMSG_SUCCESS 14 /* 0xe */
30 #define SSH1_SMSG_FAILURE 15 /* 0xf */
31 #define SSH1_CMSG_STDIN_DATA 16 /* 0x10 */
32 #define SSH1_SMSG_STDOUT_DATA 17 /* 0x11 */
33 #define SSH1_SMSG_STDERR_DATA 18 /* 0x12 */
34 #define SSH1_CMSG_EOF 19 /* 0x13 */
35 #define SSH1_SMSG_EXIT_STATUS 20 /* 0x14 */
36 #define SSH1_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* 0x15 */
37 #define SSH1_MSG_CHANNEL_OPEN_FAILURE 22 /* 0x16 */
38 #define SSH1_MSG_CHANNEL_DATA 23 /* 0x17 */
39 #define SSH1_MSG_CHANNEL_CLOSE 24 /* 0x18 */
40 #define SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* 0x19 */
41 #define SSH1_SMSG_X11_OPEN 27 /* 0x1b */
42 #define SSH1_CMSG_PORT_FORWARD_REQUEST 28 /* 0x1c */
43 #define SSH1_MSG_PORT_OPEN 29 /* 0x1d */
44 #define SSH1_CMSG_AGENT_REQUEST_FORWARDING 30 /* 0x1e */
45 #define SSH1_SMSG_AGENT_OPEN 31 /* 0x1f */
46 #define SSH1_MSG_IGNORE 32 /* 0x20 */
47 #define SSH1_CMSG_EXIT_CONFIRMATION 33 /* 0x21 */
48 #define SSH1_CMSG_X11_REQUEST_FORWARDING 34 /* 0x22 */
49 #define SSH1_CMSG_AUTH_RHOSTS_RSA 35 /* 0x23 */
50 #define SSH1_MSG_DEBUG 36 /* 0x24 */
51 #define SSH1_CMSG_REQUEST_COMPRESSION 37 /* 0x25 */
52 #define SSH1_CMSG_AUTH_TIS 39 /* 0x27 */
53 #define SSH1_SMSG_AUTH_TIS_CHALLENGE 40 /* 0x28 */
54 #define SSH1_CMSG_AUTH_TIS_RESPONSE 41 /* 0x29 */
55 #define SSH1_CMSG_AUTH_CCARD 70 /* 0x46 */
56 #define SSH1_SMSG_AUTH_CCARD_CHALLENGE 71 /* 0x47 */
57 #define SSH1_CMSG_AUTH_CCARD_RESPONSE 72 /* 0x48 */
59 #define SSH1_AUTH_TIS 5 /* 0x5 */
60 #define SSH1_AUTH_CCARD 16 /* 0x10 */
62 #define SSH1_PROTOFLAG_SCREEN_NUMBER 1 /* 0x1 */
63 /* Mask for protoflags we will echo back to server if seen */
64 #define SSH1_PROTOFLAGS_SUPPORTED 0 /* 0x1 */
66 #define SSH2_MSG_DISCONNECT 1 /* 0x1 */
67 #define SSH2_MSG_IGNORE 2 /* 0x2 */
68 #define SSH2_MSG_UNIMPLEMENTED 3 /* 0x3 */
69 #define SSH2_MSG_DEBUG 4 /* 0x4 */
70 #define SSH2_MSG_SERVICE_REQUEST 5 /* 0x5 */
71 #define SSH2_MSG_SERVICE_ACCEPT 6 /* 0x6 */
72 #define SSH2_MSG_KEXINIT 20 /* 0x14 */
73 #define SSH2_MSG_NEWKEYS 21 /* 0x15 */
74 #define SSH2_MSG_KEXDH_INIT 30 /* 0x1e */
75 #define SSH2_MSG_KEXDH_REPLY 31 /* 0x1f */
76 #define SSH2_MSG_KEX_DH_GEX_REQUEST 30 /* 0x1e */
77 #define SSH2_MSG_KEX_DH_GEX_GROUP 31 /* 0x1f */
78 #define SSH2_MSG_KEX_DH_GEX_INIT 32 /* 0x20 */
79 #define SSH2_MSG_KEX_DH_GEX_REPLY 33 /* 0x21 */
80 #define SSH2_MSG_USERAUTH_REQUEST 50 /* 0x32 */
81 #define SSH2_MSG_USERAUTH_FAILURE 51 /* 0x33 */
82 #define SSH2_MSG_USERAUTH_SUCCESS 52 /* 0x34 */
83 #define SSH2_MSG_USERAUTH_BANNER 53 /* 0x35 */
84 #define SSH2_MSG_USERAUTH_PK_OK 60 /* 0x3c */
85 #define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ 60 /* 0x3c */
86 #define SSH2_MSG_USERAUTH_INFO_REQUEST 60 /* 0x3c */
87 #define SSH2_MSG_USERAUTH_INFO_RESPONSE 61 /* 0x3d */
88 #define SSH2_MSG_GLOBAL_REQUEST 80 /* 0x50 */
89 #define SSH2_MSG_REQUEST_SUCCESS 81 /* 0x51 */
90 #define SSH2_MSG_REQUEST_FAILURE 82 /* 0x52 */
91 #define SSH2_MSG_CHANNEL_OPEN 90 /* 0x5a */
92 #define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION 91 /* 0x5b */
93 #define SSH2_MSG_CHANNEL_OPEN_FAILURE 92 /* 0x5c */
94 #define SSH2_MSG_CHANNEL_WINDOW_ADJUST 93 /* 0x5d */
95 #define SSH2_MSG_CHANNEL_DATA 94 /* 0x5e */
96 #define SSH2_MSG_CHANNEL_EXTENDED_DATA 95 /* 0x5f */
97 #define SSH2_MSG_CHANNEL_EOF 96 /* 0x60 */
98 #define SSH2_MSG_CHANNEL_CLOSE 97 /* 0x61 */
99 #define SSH2_MSG_CHANNEL_REQUEST 98 /* 0x62 */
100 #define SSH2_MSG_CHANNEL_SUCCESS 99 /* 0x63 */
101 #define SSH2_MSG_CHANNEL_FAILURE 100 /* 0x64 */
104 * Packet type contexts, so that ssh2_pkt_type can correctly decode
105 * the ambiguous type numbers back into the correct type strings.
107 #define SSH2_PKTCTX_DHGROUP 0x0001
108 #define SSH2_PKTCTX_DHGEX 0x0002
109 #define SSH2_PKTCTX_PUBLICKEY 0x0010
110 #define SSH2_PKTCTX_PASSWORD 0x0020
111 #define SSH2_PKTCTX_KBDINTER 0x0040
112 #define SSH2_PKTCTX_AUTH_MASK 0x00F0
114 #define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT 1 /* 0x1 */
115 #define SSH2_DISCONNECT_PROTOCOL_ERROR 2 /* 0x2 */
116 #define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED 3 /* 0x3 */
117 #define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED 4 /* 0x4 */
118 #define SSH2_DISCONNECT_MAC_ERROR 5 /* 0x5 */
119 #define SSH2_DISCONNECT_COMPRESSION_ERROR 6 /* 0x6 */
120 #define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE 7 /* 0x7 */
121 #define SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED 8 /* 0x8 */
122 #define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE 9 /* 0x9 */
123 #define SSH2_DISCONNECT_CONNECTION_LOST 10 /* 0xa */
124 #define SSH2_DISCONNECT_BY_APPLICATION 11 /* 0xb */
125 #define SSH2_DISCONNECT_TOO_MANY_CONNECTIONS 12 /* 0xc */
126 #define SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER 13 /* 0xd */
127 #define SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE 14 /* 0xe */
128 #define SSH2_DISCONNECT_ILLEGAL_USER_NAME 15 /* 0xf */
130 static const char *const ssh2_disconnect_reasons
[] = {
132 "SSH_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT",
133 "SSH_DISCONNECT_PROTOCOL_ERROR",
134 "SSH_DISCONNECT_KEY_EXCHANGE_FAILED",
135 "SSH_DISCONNECT_HOST_AUTHENTICATION_FAILED",
136 "SSH_DISCONNECT_MAC_ERROR",
137 "SSH_DISCONNECT_COMPRESSION_ERROR",
138 "SSH_DISCONNECT_SERVICE_NOT_AVAILABLE",
139 "SSH_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED",
140 "SSH_DISCONNECT_HOST_KEY_NOT_VERIFIABLE",
141 "SSH_DISCONNECT_CONNECTION_LOST",
142 "SSH_DISCONNECT_BY_APPLICATION",
143 "SSH_DISCONNECT_TOO_MANY_CONNECTIONS",
144 "SSH_DISCONNECT_AUTH_CANCELLED_BY_USER",
145 "SSH_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE",
146 "SSH_DISCONNECT_ILLEGAL_USER_NAME",
149 #define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1 /* 0x1 */
150 #define SSH2_OPEN_CONNECT_FAILED 2 /* 0x2 */
151 #define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3 /* 0x3 */
152 #define SSH2_OPEN_RESOURCE_SHORTAGE 4 /* 0x4 */
154 #define SSH2_EXTENDED_DATA_STDERR 1 /* 0x1 */
157 * Various remote-bug flags.
159 #define BUG_CHOKES_ON_SSH1_IGNORE 1
160 #define BUG_SSH2_HMAC 2
161 #define BUG_NEEDS_SSH1_PLAIN_PASSWORD 4
162 #define BUG_CHOKES_ON_RSA 8
163 #define BUG_SSH2_RSA_PADDING 16
164 #define BUG_SSH2_DERIVEKEY 32
165 /* 64 was BUG_SSH2_DH_GEX, now spare */
166 #define BUG_SSH2_PK_SESSIONID 128
168 #define translate(x) if (type == x) return #x
169 #define translatec(x,ctx) if (type == x && (pkt_ctx & ctx)) return #x
170 static char *ssh1_pkt_type(int type
)
172 translate(SSH1_MSG_DISCONNECT
);
173 translate(SSH1_SMSG_PUBLIC_KEY
);
174 translate(SSH1_CMSG_SESSION_KEY
);
175 translate(SSH1_CMSG_USER
);
176 translate(SSH1_CMSG_AUTH_RSA
);
177 translate(SSH1_SMSG_AUTH_RSA_CHALLENGE
);
178 translate(SSH1_CMSG_AUTH_RSA_RESPONSE
);
179 translate(SSH1_CMSG_AUTH_PASSWORD
);
180 translate(SSH1_CMSG_REQUEST_PTY
);
181 translate(SSH1_CMSG_WINDOW_SIZE
);
182 translate(SSH1_CMSG_EXEC_SHELL
);
183 translate(SSH1_CMSG_EXEC_CMD
);
184 translate(SSH1_SMSG_SUCCESS
);
185 translate(SSH1_SMSG_FAILURE
);
186 translate(SSH1_CMSG_STDIN_DATA
);
187 translate(SSH1_SMSG_STDOUT_DATA
);
188 translate(SSH1_SMSG_STDERR_DATA
);
189 translate(SSH1_CMSG_EOF
);
190 translate(SSH1_SMSG_EXIT_STATUS
);
191 translate(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
);
192 translate(SSH1_MSG_CHANNEL_OPEN_FAILURE
);
193 translate(SSH1_MSG_CHANNEL_DATA
);
194 translate(SSH1_MSG_CHANNEL_CLOSE
);
195 translate(SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
);
196 translate(SSH1_SMSG_X11_OPEN
);
197 translate(SSH1_CMSG_PORT_FORWARD_REQUEST
);
198 translate(SSH1_MSG_PORT_OPEN
);
199 translate(SSH1_CMSG_AGENT_REQUEST_FORWARDING
);
200 translate(SSH1_SMSG_AGENT_OPEN
);
201 translate(SSH1_MSG_IGNORE
);
202 translate(SSH1_CMSG_EXIT_CONFIRMATION
);
203 translate(SSH1_CMSG_X11_REQUEST_FORWARDING
);
204 translate(SSH1_CMSG_AUTH_RHOSTS_RSA
);
205 translate(SSH1_MSG_DEBUG
);
206 translate(SSH1_CMSG_REQUEST_COMPRESSION
);
207 translate(SSH1_CMSG_AUTH_TIS
);
208 translate(SSH1_SMSG_AUTH_TIS_CHALLENGE
);
209 translate(SSH1_CMSG_AUTH_TIS_RESPONSE
);
210 translate(SSH1_CMSG_AUTH_CCARD
);
211 translate(SSH1_SMSG_AUTH_CCARD_CHALLENGE
);
212 translate(SSH1_CMSG_AUTH_CCARD_RESPONSE
);
215 static char *ssh2_pkt_type(int pkt_ctx
, int type
)
217 translate(SSH2_MSG_DISCONNECT
);
218 translate(SSH2_MSG_IGNORE
);
219 translate(SSH2_MSG_UNIMPLEMENTED
);
220 translate(SSH2_MSG_DEBUG
);
221 translate(SSH2_MSG_SERVICE_REQUEST
);
222 translate(SSH2_MSG_SERVICE_ACCEPT
);
223 translate(SSH2_MSG_KEXINIT
);
224 translate(SSH2_MSG_NEWKEYS
);
225 translatec(SSH2_MSG_KEXDH_INIT
, SSH2_PKTCTX_DHGROUP
);
226 translatec(SSH2_MSG_KEXDH_REPLY
, SSH2_PKTCTX_DHGROUP
);
227 translatec(SSH2_MSG_KEX_DH_GEX_REQUEST
, SSH2_PKTCTX_DHGEX
);
228 translatec(SSH2_MSG_KEX_DH_GEX_GROUP
, SSH2_PKTCTX_DHGEX
);
229 translatec(SSH2_MSG_KEX_DH_GEX_INIT
, SSH2_PKTCTX_DHGEX
);
230 translatec(SSH2_MSG_KEX_DH_GEX_REPLY
, SSH2_PKTCTX_DHGEX
);
231 translate(SSH2_MSG_USERAUTH_REQUEST
);
232 translate(SSH2_MSG_USERAUTH_FAILURE
);
233 translate(SSH2_MSG_USERAUTH_SUCCESS
);
234 translate(SSH2_MSG_USERAUTH_BANNER
);
235 translatec(SSH2_MSG_USERAUTH_PK_OK
, SSH2_PKTCTX_PUBLICKEY
);
236 translatec(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ
, SSH2_PKTCTX_PASSWORD
);
237 translatec(SSH2_MSG_USERAUTH_INFO_REQUEST
, SSH2_PKTCTX_KBDINTER
);
238 translatec(SSH2_MSG_USERAUTH_INFO_RESPONSE
, SSH2_PKTCTX_KBDINTER
);
239 translate(SSH2_MSG_GLOBAL_REQUEST
);
240 translate(SSH2_MSG_REQUEST_SUCCESS
);
241 translate(SSH2_MSG_REQUEST_FAILURE
);
242 translate(SSH2_MSG_CHANNEL_OPEN
);
243 translate(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
);
244 translate(SSH2_MSG_CHANNEL_OPEN_FAILURE
);
245 translate(SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
246 translate(SSH2_MSG_CHANNEL_DATA
);
247 translate(SSH2_MSG_CHANNEL_EXTENDED_DATA
);
248 translate(SSH2_MSG_CHANNEL_EOF
);
249 translate(SSH2_MSG_CHANNEL_CLOSE
);
250 translate(SSH2_MSG_CHANNEL_REQUEST
);
251 translate(SSH2_MSG_CHANNEL_SUCCESS
);
252 translate(SSH2_MSG_CHANNEL_FAILURE
);
258 #define GET_32BIT(cp) \
259 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
260 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
261 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
262 ((unsigned long)(unsigned char)(cp)[3]))
264 #define PUT_32BIT(cp, value) { \
265 (cp)[0] = (unsigned char)((value) >> 24); \
266 (cp)[1] = (unsigned char)((value) >> 16); \
267 (cp)[2] = (unsigned char)((value) >> 8); \
268 (cp)[3] = (unsigned char)(value); }
270 /* Enumeration values for fields in SSH-1 packets */
272 PKT_END
, PKT_INT
, PKT_CHAR
, PKT_DATA
, PKT_STR
, PKT_BIGNUM
,
273 /* These values are for communicating relevant semantics of
274 * fields to the packet logging code. */
275 PKTT_OTHER
, PKTT_PASSWORD
, PKTT_DATA
279 * Coroutine mechanics for the sillier bits of the code. If these
280 * macros look impenetrable to you, you might find it helpful to
283 * http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
285 * which explains the theory behind these macros.
287 * In particular, if you are getting `case expression not constant'
288 * errors when building with MS Visual Studio, this is because MS's
289 * Edit and Continue debugging feature causes their compiler to
290 * violate ANSI C. To disable Edit and Continue debugging:
292 * - right-click ssh.c in the FileView
294 * - select the C/C++ tab and the General category
295 * - under `Debug info:', select anything _other_ than `Program
296 * Database for Edit and Continue'.
298 #define crBegin(v) { int *crLine = &v; switch(v) { case 0:;
301 if (!ssh->t) ssh->t = snew(struct t); \
303 #define crFinish(z) } *crLine = 0; return (z); }
304 #define crFinishV } *crLine = 0; return; }
305 #define crReturn(z) \
307 *crLine =__LINE__; return (z); case __LINE__:;\
311 *crLine=__LINE__; return; case __LINE__:;\
313 #define crStop(z) do{ *crLine = 0; return (z); }while(0)
314 #define crStopV do{ *crLine = 0; return; }while(0)
315 #define crWaitUntil(c) do { crReturn(0); } while (!(c))
316 #define crWaitUntilV(c) do { crReturnV; } while (!(c))
318 typedef struct ssh_tag
*Ssh
;
321 static struct Packet
*ssh2_pkt_init(int pkt_type
);
322 static void ssh2_pkt_addbool(struct Packet
*, unsigned char value
);
323 static void ssh2_pkt_adduint32(struct Packet
*, unsigned long value
);
324 static void ssh2_pkt_addstring_start(struct Packet
*);
325 static void ssh2_pkt_addstring_str(struct Packet
*, char *data
);
326 static void ssh2_pkt_addstring_data(struct Packet
*, char *data
, int len
);
327 static void ssh2_pkt_addstring(struct Packet
*, char *data
);
328 static unsigned char *ssh2_mpint_fmt(Bignum b
, int *len
);
329 static void ssh2_pkt_addmp(struct Packet
*, Bignum b
);
330 static int ssh2_pkt_construct(Ssh
, struct Packet
*);
331 static void ssh2_pkt_send(Ssh
, struct Packet
*);
332 static void ssh2_pkt_send_noqueue(Ssh
, struct Packet
*);
333 static int do_ssh1_login(Ssh ssh
, unsigned char *in
, int inlen
,
334 struct Packet
*pktin
);
335 static void do_ssh2_authconn(Ssh ssh
, unsigned char *in
, int inlen
,
336 struct Packet
*pktin
);
339 * Buffer management constants. There are several of these for
340 * various different purposes:
342 * - SSH1_BUFFER_LIMIT is the amount of backlog that must build up
343 * on a local data stream before we throttle the whole SSH
344 * connection (in SSH1 only). Throttling the whole connection is
345 * pretty drastic so we set this high in the hope it won't
348 * - SSH_MAX_BACKLOG is the amount of backlog that must build up
349 * on the SSH connection itself before we defensively throttle
350 * _all_ local data streams. This is pretty drastic too (though
351 * thankfully unlikely in SSH2 since the window mechanism should
352 * ensure that the server never has any need to throttle its end
353 * of the connection), so we set this high as well.
355 * - OUR_V2_WINSIZE is the maximum window size we present on SSH2
359 #define SSH1_BUFFER_LIMIT 32768
360 #define SSH_MAX_BACKLOG 32768
361 #define OUR_V2_WINSIZE 16384
363 const static struct ssh_signkey
*hostkey_algs
[] = { &ssh_rsa
, &ssh_dss
};
365 static void *nullmac_make_context(void)
369 static void nullmac_free_context(void *handle
)
372 static void nullmac_key(void *handle
, unsigned char *key
)
375 static void nullmac_generate(void *handle
, unsigned char *blk
, int len
,
379 static int nullmac_verify(void *handle
, unsigned char *blk
, int len
,
384 const static struct ssh_mac ssh_mac_none
= {
385 nullmac_make_context
, nullmac_free_context
, nullmac_key
,
386 nullmac_generate
, nullmac_verify
, "none", 0
388 const static struct ssh_mac
*macs
[] = {
389 &ssh_sha1
, &ssh_md5
, &ssh_mac_none
391 const static struct ssh_mac
*buggymacs
[] = {
392 &ssh_sha1_buggy
, &ssh_md5
, &ssh_mac_none
395 static void *ssh_comp_none_init(void)
399 static void ssh_comp_none_cleanup(void *handle
)
402 static int ssh_comp_none_block(void *handle
, unsigned char *block
, int len
,
403 unsigned char **outblock
, int *outlen
)
407 static int ssh_comp_none_disable(void *handle
)
411 const static struct ssh_compress ssh_comp_none
= {
413 ssh_comp_none_init
, ssh_comp_none_cleanup
, ssh_comp_none_block
,
414 ssh_comp_none_init
, ssh_comp_none_cleanup
, ssh_comp_none_block
,
415 ssh_comp_none_disable
, NULL
417 extern const struct ssh_compress ssh_zlib
;
418 const static struct ssh_compress
*compressions
[] = {
419 &ssh_zlib
, &ssh_comp_none
422 enum { /* channel types */
427 CHAN_SOCKDATA_DORMANT
/* one the remote hasn't confirmed */
431 * 2-3-4 tree storing channels.
434 Ssh ssh
; /* pointer back to main context */
435 unsigned remoteid
, localid
;
438 * In SSH1, this value contains four bits:
440 * 1 We have sent SSH1_MSG_CHANNEL_CLOSE.
441 * 2 We have sent SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION.
442 * 4 We have received SSH1_MSG_CHANNEL_CLOSE.
443 * 8 We have received SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION.
445 * A channel is completely finished with when all four bits are set.
449 struct ssh1_data_channel
{
452 struct ssh2_data_channel
{
454 unsigned remwindow
, remmaxpkt
;
459 struct ssh_agent_channel
{
460 unsigned char *message
;
461 unsigned char msglen
[4];
462 unsigned lensofar
, totallen
;
464 struct ssh_x11_channel
{
467 struct ssh_pfd_channel
{
474 * 2-3-4 tree storing remote->local port forwardings. SSH 1 and SSH
475 * 2 use this structure in different ways, reflecting SSH 2's
476 * altogether saner approach to port forwarding.
478 * In SSH 1, you arrange a remote forwarding by sending the server
479 * the remote port number, and the local destination host:port.
480 * When a connection comes in, the server sends you back that
481 * host:port pair, and you connect to it. This is a ready-made
482 * security hole if you're not on the ball: a malicious server
483 * could send you back _any_ host:port pair, so if you trustingly
484 * connect to the address it gives you then you've just opened the
485 * entire inside of your corporate network just by connecting
486 * through it to a dodgy SSH server. Hence, we must store a list of
487 * host:port pairs we _are_ trying to forward to, and reject a
488 * connection request from the server if it's not in the list.
490 * In SSH 2, each side of the connection minds its own business and
491 * doesn't send unnecessary information to the other. You arrange a
492 * remote forwarding by sending the server just the remote port
493 * number. When a connection comes in, the server tells you which
494 * of its ports was connected to; and _you_ have to remember what
495 * local host:port pair went with that port number.
497 * Hence, in SSH 1 this structure is indexed by destination
498 * host:port pair, whereas in SSH 2 it is indexed by source port.
500 struct ssh_portfwd
; /* forward declaration */
502 struct ssh_rportfwd
{
503 unsigned sport
, dport
;
506 struct ssh_portfwd
*pfrec
;
508 #define free_rportfwd(pf) ( \
509 ((pf) ? (sfree((pf)->sportdesc)) : (void)0 ), sfree(pf) )
512 * Separately to the rportfwd tree (which is for looking up port
513 * open requests from the server), a tree of _these_ structures is
514 * used to keep track of all the currently open port forwardings,
515 * so that we can reconfigure in mid-session if the user requests
519 enum { DESTROY
, KEEP
, CREATE
} status
;
521 unsigned sport
, dport
;
524 struct ssh_rportfwd
*remote
;
528 #define free_portfwd(pf) ( \
529 ((pf) ? (sfree((pf)->saddr), sfree((pf)->daddr), \
530 sfree((pf)->sserv), sfree((pf)->dserv)) : (void)0 ), sfree(pf) )
535 unsigned long sequence
;
540 long encrypted_len
; /* for SSH2 total-size counting */
543 * State associated with packet logging
547 struct logblank_t
*blanks
;
550 static void ssh1_protocol(Ssh ssh
, unsigned char *in
, int inlen
,
551 struct Packet
*pktin
);
552 static void ssh2_protocol(Ssh ssh
, unsigned char *in
, int inlen
,
553 struct Packet
*pktin
);
554 static void ssh1_protocol_setup(Ssh ssh
);
555 static void ssh2_protocol_setup(Ssh ssh
);
556 static void ssh_size(void *handle
, int width
, int height
);
557 static void ssh_special(void *handle
, Telnet_Special
);
558 static int ssh2_try_send(struct ssh_channel
*c
);
559 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
, int len
);
560 static void ssh_throttle_all(Ssh ssh
, int enable
, int bufsize
);
561 static void ssh2_set_window(struct ssh_channel
*c
, unsigned newwin
);
562 static int ssh_sendbuffer(void *handle
);
563 static void ssh_do_close(Ssh ssh
);
564 static unsigned long ssh_pkt_getuint32(struct Packet
*pkt
);
565 static int ssh2_pkt_getbool(struct Packet
*pkt
);
566 static void ssh_pkt_getstring(struct Packet
*pkt
, char **p
, int *length
);
567 static void ssh2_timer(void *ctx
, long now
);
568 static int do_ssh2_transport(Ssh ssh
, unsigned char *in
, int inlen
,
569 struct Packet
*pktin
);
571 struct rdpkt1_state_tag
{
572 long len
, pad
, biglen
, to_read
;
573 unsigned long realcrc
, gotcrc
;
577 struct Packet
*pktin
;
580 struct rdpkt2_state_tag
{
581 long len
, pad
, payload
, packetlen
, maclen
;
584 unsigned long incoming_sequence
;
585 struct Packet
*pktin
;
588 typedef void (*handler_fn_t
)(Ssh ssh
, struct Packet
*pktin
);
589 typedef void (*chandler_fn_t
)(Ssh ssh
, struct Packet
*pktin
, void *ctx
);
591 struct queued_handler
;
592 struct queued_handler
{
594 chandler_fn_t handler
;
596 struct queued_handler
*next
;
600 const struct plug_function_table
*fn
;
601 /* the above field _must_ be first in the structure */
603 SHA_State exhash
, exhashbase
;
610 unsigned char session_key
[32];
612 int v1_remote_protoflags
;
613 int v1_local_protoflags
;
614 int agentfwd_enabled
;
617 const struct ssh_cipher
*cipher
;
620 const struct ssh2_cipher
*cscipher
, *sccipher
;
621 void *cs_cipher_ctx
, *sc_cipher_ctx
;
622 const struct ssh_mac
*csmac
, *scmac
;
623 void *cs_mac_ctx
, *sc_mac_ctx
;
624 const struct ssh_compress
*cscomp
, *sccomp
;
625 void *cs_comp_ctx
, *sc_comp_ctx
;
626 const struct ssh_kex
*kex
;
627 const struct ssh_signkey
*hostkey
;
628 unsigned char v2_session_id
[20];
634 int echoing
, editing
;
638 int ospeed
, ispeed
; /* temporaries */
639 int term_width
, term_height
;
641 tree234
*channels
; /* indexed by local id */
642 struct ssh_channel
*mainchan
; /* primary session channel */
645 tree234
*rportfwds
, *portfwds
;
649 SSH_STATE_BEFORE_SIZE
,
655 int size_needed
, eof_needed
;
657 struct Packet
**queue
;
658 int queuelen
, queuesize
;
660 unsigned char *deferred_send_data
;
661 int deferred_len
, deferred_size
;
664 * Gross hack: pscp will try to start SFTP but fall back to
665 * scp1 if that fails. This variable is the means by which
666 * scp.c can reach into the SSH code and find out which one it
672 * Used for username and password input.
674 char *userpass_input_buffer
;
675 int userpass_input_buflen
;
676 int userpass_input_bufpos
;
677 int userpass_input_echo
;
684 int v1_throttle_count
;
687 int v1_stdout_throttling
;
688 int v2_outgoing_sequence
;
690 int ssh1_rdpkt_crstate
;
691 int ssh2_rdpkt_crstate
;
692 int do_ssh_init_crstate
;
693 int ssh_gotdata_crstate
;
694 int do_ssh1_login_crstate
;
695 int do_ssh1_connection_crstate
;
696 int do_ssh2_transport_crstate
;
697 int do_ssh2_authconn_crstate
;
699 void *do_ssh_init_state
;
700 void *do_ssh1_login_state
;
701 void *do_ssh2_transport_state
;
702 void *do_ssh2_authconn_state
;
704 struct rdpkt1_state_tag rdpkt1_state
;
705 struct rdpkt2_state_tag rdpkt2_state
;
707 /* ssh1 and ssh2 use this for different things, but both use it */
708 int protocol_initial_phase_done
;
710 void (*protocol
) (Ssh ssh
, unsigned char *in
, int inlen
,
712 struct Packet
*(*s_rdpkt
) (Ssh ssh
, unsigned char **data
, int *datalen
);
715 * We maintain a full _copy_ of a Config structure here, not
716 * merely a pointer to it. That way, when we're passed a new
717 * one for reconfiguration, we can check the differences and
718 * potentially reconfigure port forwardings etc in mid-session.
723 * Used to transfer data back from async agent callbacks.
725 void *agent_response
;
726 int agent_response_len
;
729 * Dispatch table for packet types that we may have to deal
732 handler_fn_t packet_dispatch
[256];
735 * Queues of one-off handler functions for success/failure
736 * indications from a request.
738 struct queued_handler
*qhead
, *qtail
;
741 * This module deals with sending keepalives.
746 * Track incoming and outgoing data sizes and time, for
749 unsigned long incoming_data_size
, outgoing_data_size
, deferred_data_size
;
750 unsigned long max_data_size
;
752 long next_rekey
, last_rekey
;
755 #define logevent(s) logevent(ssh->frontend, s)
757 /* logevent, only printf-formatted. */
758 static void logeventf(Ssh ssh
, const char *fmt
, ...)
764 buf
= dupvprintf(fmt
, ap
);
770 #define bombout(msg) \
772 char *text = dupprintf msg; \
775 connection_fatal(ssh->frontend, "%s", text); \
779 /* Functions to leave bits out of the SSH packet log file. */
781 static void dont_log_password(Ssh ssh
, struct Packet
*pkt
, int blanktype
)
783 if (ssh
->cfg
.logomitpass
)
784 pkt
->logmode
= blanktype
;
787 static void dont_log_data(Ssh ssh
, struct Packet
*pkt
, int blanktype
)
789 if (ssh
->cfg
.logomitdata
)
790 pkt
->logmode
= blanktype
;
793 static void end_log_omission(Ssh ssh
, struct Packet
*pkt
)
795 pkt
->logmode
= PKTLOG_EMIT
;
798 static int ssh_channelcmp(void *av
, void *bv
)
800 struct ssh_channel
*a
= (struct ssh_channel
*) av
;
801 struct ssh_channel
*b
= (struct ssh_channel
*) bv
;
802 if (a
->localid
< b
->localid
)
804 if (a
->localid
> b
->localid
)
808 static int ssh_channelfind(void *av
, void *bv
)
810 unsigned *a
= (unsigned *) av
;
811 struct ssh_channel
*b
= (struct ssh_channel
*) bv
;
819 static int ssh_rportcmp_ssh1(void *av
, void *bv
)
821 struct ssh_rportfwd
*a
= (struct ssh_rportfwd
*) av
;
822 struct ssh_rportfwd
*b
= (struct ssh_rportfwd
*) bv
;
824 if ( (i
= strcmp(a
->dhost
, b
->dhost
)) != 0)
825 return i
< 0 ?
-1 : +1;
826 if (a
->dport
> b
->dport
)
828 if (a
->dport
< b
->dport
)
833 static int ssh_rportcmp_ssh2(void *av
, void *bv
)
835 struct ssh_rportfwd
*a
= (struct ssh_rportfwd
*) av
;
836 struct ssh_rportfwd
*b
= (struct ssh_rportfwd
*) bv
;
838 if (a
->sport
> b
->sport
)
840 if (a
->sport
< b
->sport
)
846 * Special form of strcmp which can cope with NULL inputs. NULL is
847 * defined to sort before even the empty string.
849 static int nullstrcmp(const char *a
, const char *b
)
851 if (a
== NULL
&& b
== NULL
)
860 static int ssh_portcmp(void *av
, void *bv
)
862 struct ssh_portfwd
*a
= (struct ssh_portfwd
*) av
;
863 struct ssh_portfwd
*b
= (struct ssh_portfwd
*) bv
;
865 if (a
->type
> b
->type
)
867 if (a
->type
< b
->type
)
869 if (a
->addressfamily
> b
->addressfamily
)
871 if (a
->addressfamily
< b
->addressfamily
)
873 if ( (i
= nullstrcmp(a
->saddr
, b
->saddr
)) != 0)
874 return i
< 0 ?
-1 : +1;
875 if (a
->sport
> b
->sport
)
877 if (a
->sport
< b
->sport
)
879 if (a
->type
!= 'D') {
880 if ( (i
= nullstrcmp(a
->daddr
, b
->daddr
)) != 0)
881 return i
< 0 ?
-1 : +1;
882 if (a
->dport
> b
->dport
)
884 if (a
->dport
< b
->dport
)
890 static int alloc_channel_id(Ssh ssh
)
892 const unsigned CHANNEL_NUMBER_OFFSET
= 256;
893 unsigned low
, high
, mid
;
895 struct ssh_channel
*c
;
898 * First-fit allocation of channel numbers: always pick the
899 * lowest unused one. To do this, binary-search using the
900 * counted B-tree to find the largest channel ID which is in a
901 * contiguous sequence from the beginning. (Precisely
902 * everything in that sequence must have ID equal to its tree
903 * index plus CHANNEL_NUMBER_OFFSET.)
905 tsize
= count234(ssh
->channels
);
909 while (high
- low
> 1) {
910 mid
= (high
+ low
) / 2;
911 c
= index234(ssh
->channels
, mid
);
912 if (c
->localid
== mid
+ CHANNEL_NUMBER_OFFSET
)
913 low
= mid
; /* this one is fine */
915 high
= mid
; /* this one is past it */
918 * Now low points to either -1, or the tree index of the
919 * largest ID in the initial sequence.
922 unsigned i
= low
+ 1 + CHANNEL_NUMBER_OFFSET
;
923 assert(NULL
== find234(ssh
->channels
, &i
, ssh_channelfind
));
925 return low
+ 1 + CHANNEL_NUMBER_OFFSET
;
928 static void c_write(Ssh ssh
, const char *buf
, int len
)
930 if ((flags
& FLAG_STDERR
)) {
932 for (i
= 0; i
< len
; i
++)
934 fputc(buf
[i
], stderr
);
937 from_backend(ssh
->frontend
, 1, buf
, len
);
940 static void c_write_untrusted(Ssh ssh
, const char *buf
, int len
)
943 for (i
= 0; i
< len
; i
++) {
945 c_write(ssh
, "\r\n", 2);
946 else if ((buf
[i
] & 0x60) || (buf
[i
] == '\r'))
947 c_write(ssh
, buf
+ i
, 1);
951 static void c_write_str(Ssh ssh
, const char *buf
)
953 c_write(ssh
, buf
, strlen(buf
));
956 static void ssh_free_packet(struct Packet
*pkt
)
961 static struct Packet
*ssh_new_packet(void)
963 struct Packet
*pkt
= snew(struct Packet
);
967 pkt
->logmode
= PKTLOG_EMIT
;
975 * Collect incoming data in the incoming packet buffer.
976 * Decipher and verify the packet when it is completely read.
977 * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets.
978 * Update the *data and *datalen variables.
979 * Return a Packet structure when a packet is completed.
981 static struct Packet
*ssh1_rdpkt(Ssh ssh
, unsigned char **data
, int *datalen
)
983 struct rdpkt1_state_tag
*st
= &ssh
->rdpkt1_state
;
985 crBegin(ssh
->ssh1_rdpkt_crstate
);
987 st
->pktin
= ssh_new_packet();
990 st
->pktin
->length
= 0;
992 for (st
->i
= st
->len
= 0; st
->i
< 4; st
->i
++) {
993 while ((*datalen
) == 0)
995 st
->len
= (st
->len
<< 8) + **data
;
996 (*data
)++, (*datalen
)--;
999 st
->pad
= 8 - (st
->len
% 8);
1000 st
->biglen
= st
->len
+ st
->pad
;
1001 st
->pktin
->length
= st
->len
- 5;
1003 if (st
->biglen
< 0) {
1004 bombout(("Extremely large packet length from server suggests"
1005 " data stream corruption"));
1006 ssh_free_packet(st
->pktin
);
1010 st
->pktin
->maxlen
= st
->biglen
;
1011 st
->pktin
->data
= snewn(st
->biglen
+ APIEXTRA
, unsigned char);
1013 st
->to_read
= st
->biglen
;
1014 st
->p
= st
->pktin
->data
;
1015 while (st
->to_read
> 0) {
1016 st
->chunk
= st
->to_read
;
1017 while ((*datalen
) == 0)
1019 if (st
->chunk
> (*datalen
))
1020 st
->chunk
= (*datalen
);
1021 memcpy(st
->p
, *data
, st
->chunk
);
1023 *datalen
-= st
->chunk
;
1025 st
->to_read
-= st
->chunk
;
1028 if (ssh
->cipher
&& detect_attack(ssh
->crcda_ctx
, st
->pktin
->data
,
1029 st
->biglen
, NULL
)) {
1030 bombout(("Network attack (CRC compensation) detected!"));
1031 ssh_free_packet(st
->pktin
);
1036 ssh
->cipher
->decrypt(ssh
->v1_cipher_ctx
, st
->pktin
->data
, st
->biglen
);
1038 st
->realcrc
= crc32_compute(st
->pktin
->data
, st
->biglen
- 4);
1039 st
->gotcrc
= GET_32BIT(st
->pktin
->data
+ st
->biglen
- 4);
1040 if (st
->gotcrc
!= st
->realcrc
) {
1041 bombout(("Incorrect CRC received on packet"));
1042 ssh_free_packet(st
->pktin
);
1046 st
->pktin
->body
= st
->pktin
->data
+ st
->pad
+ 1;
1047 st
->pktin
->savedpos
= 0;
1049 if (ssh
->v1_compressing
) {
1050 unsigned char *decompblk
;
1052 if (!zlib_decompress_block(ssh
->sc_comp_ctx
,
1053 st
->pktin
->body
- 1, st
->pktin
->length
+ 1,
1054 &decompblk
, &decomplen
)) {
1055 bombout(("Zlib decompression encountered invalid data"));
1056 ssh_free_packet(st
->pktin
);
1060 if (st
->pktin
->maxlen
< st
->pad
+ decomplen
) {
1061 st
->pktin
->maxlen
= st
->pad
+ decomplen
;
1062 st
->pktin
->data
= sresize(st
->pktin
->data
,
1063 st
->pktin
->maxlen
+ APIEXTRA
,
1065 st
->pktin
->body
= st
->pktin
->data
+ st
->pad
+ 1;
1068 memcpy(st
->pktin
->body
- 1, decompblk
, decomplen
);
1070 st
->pktin
->length
= decomplen
- 1;
1073 st
->pktin
->type
= st
->pktin
->body
[-1];
1076 * Log incoming packet, possibly omitting sensitive fields.
1080 struct logblank_t blank
;
1081 if (ssh
->cfg
.logomitdata
) {
1082 int do_blank
= FALSE
, blank_prefix
= 0;
1083 /* "Session data" packets - omit the data field */
1084 if ((st
->pktin
->type
== SSH1_SMSG_STDOUT_DATA
) ||
1085 (st
->pktin
->type
== SSH1_SMSG_STDERR_DATA
)) {
1086 do_blank
= TRUE
; blank_prefix
= 0;
1087 } else if (st
->pktin
->type
== SSH1_MSG_CHANNEL_DATA
) {
1088 do_blank
= TRUE
; blank_prefix
= 4;
1091 blank
.offset
= blank_prefix
;
1092 blank
.len
= st
->pktin
->length
;
1093 blank
.type
= PKTLOG_OMIT
;
1097 log_packet(ssh
->logctx
,
1098 PKT_INCOMING
, st
->pktin
->type
,
1099 ssh1_pkt_type(st
->pktin
->type
),
1100 st
->pktin
->body
, st
->pktin
->length
,
1104 crFinish(st
->pktin
);
1107 static struct Packet
*ssh2_rdpkt(Ssh ssh
, unsigned char **data
, int *datalen
)
1109 struct rdpkt2_state_tag
*st
= &ssh
->rdpkt2_state
;
1111 crBegin(ssh
->ssh2_rdpkt_crstate
);
1113 st
->pktin
= ssh_new_packet();
1115 st
->pktin
->type
= 0;
1116 st
->pktin
->length
= 0;
1118 st
->cipherblk
= ssh
->sccipher
->blksize
;
1121 if (st
->cipherblk
< 8)
1124 st
->pktin
->data
= snewn(st
->cipherblk
+ APIEXTRA
, unsigned char);
1127 * Acquire and decrypt the first block of the packet. This will
1128 * contain the length and padding details.
1130 for (st
->i
= st
->len
= 0; st
->i
< st
->cipherblk
; st
->i
++) {
1131 while ((*datalen
) == 0)
1133 st
->pktin
->data
[st
->i
] = *(*data
)++;
1138 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
1139 st
->pktin
->data
, st
->cipherblk
);
1142 * Now get the length and padding figures.
1144 st
->len
= GET_32BIT(st
->pktin
->data
);
1145 st
->pad
= st
->pktin
->data
[4];
1148 * _Completely_ silly lengths should be stomped on before they
1149 * do us any more damage.
1151 if (st
->len
< 0 || st
->pad
< 0 || st
->len
+ st
->pad
< 0) {
1152 bombout(("Incoming packet was garbled on decryption"));
1153 ssh_free_packet(st
->pktin
);
1158 * This enables us to deduce the payload length.
1160 st
->payload
= st
->len
- st
->pad
- 1;
1162 st
->pktin
->length
= st
->payload
+ 5;
1165 * So now we can work out the total packet length.
1167 st
->packetlen
= st
->len
+ 4;
1168 st
->maclen
= ssh
->scmac ? ssh
->scmac
->len
: 0;
1171 * Allocate memory for the rest of the packet.
1173 st
->pktin
->maxlen
= st
->packetlen
+ st
->maclen
;
1174 st
->pktin
->data
= sresize(st
->pktin
->data
,
1175 st
->pktin
->maxlen
+ APIEXTRA
,
1179 * Read and decrypt the remainder of the packet.
1181 for (st
->i
= st
->cipherblk
; st
->i
< st
->packetlen
+ st
->maclen
;
1183 while ((*datalen
) == 0)
1185 st
->pktin
->data
[st
->i
] = *(*data
)++;
1188 /* Decrypt everything _except_ the MAC. */
1190 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
1191 st
->pktin
->data
+ st
->cipherblk
,
1192 st
->packetlen
- st
->cipherblk
);
1194 st
->pktin
->encrypted_len
= st
->packetlen
;
1200 && !ssh
->scmac
->verify(ssh
->sc_mac_ctx
, st
->pktin
->data
, st
->len
+ 4,
1201 st
->incoming_sequence
)) {
1202 bombout(("Incorrect MAC received on packet"));
1203 ssh_free_packet(st
->pktin
);
1207 st
->pktin
->sequence
= st
->incoming_sequence
++;
1210 * Decompress packet payload.
1213 unsigned char *newpayload
;
1216 ssh
->sccomp
->decompress(ssh
->sc_comp_ctx
,
1217 st
->pktin
->data
+ 5, st
->pktin
->length
- 5,
1218 &newpayload
, &newlen
)) {
1219 if (st
->pktin
->maxlen
< newlen
+ 5) {
1220 st
->pktin
->maxlen
= newlen
+ 5;
1221 st
->pktin
->data
= sresize(st
->pktin
->data
,
1222 st
->pktin
->maxlen
+ APIEXTRA
,
1225 st
->pktin
->length
= 5 + newlen
;
1226 memcpy(st
->pktin
->data
+ 5, newpayload
, newlen
);
1231 st
->pktin
->savedpos
= 6;
1232 st
->pktin
->body
= st
->pktin
->data
;
1233 st
->pktin
->type
= st
->pktin
->data
[5];
1236 * Log incoming packet, possibly omitting sensitive fields.
1240 struct logblank_t blank
;
1241 if (ssh
->cfg
.logomitdata
) {
1242 int do_blank
= FALSE
, blank_prefix
= 0;
1243 /* "Session data" packets - omit the data field */
1244 if (st
->pktin
->type
== SSH2_MSG_CHANNEL_DATA
) {
1245 do_blank
= TRUE
; blank_prefix
= 4;
1246 } else if (st
->pktin
->type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
) {
1247 do_blank
= TRUE
; blank_prefix
= 8;
1250 blank
.offset
= blank_prefix
;
1251 blank
.len
= (st
->pktin
->length
-6) - blank_prefix
;
1252 blank
.type
= PKTLOG_OMIT
;
1256 log_packet(ssh
->logctx
, PKT_INCOMING
, st
->pktin
->type
,
1257 ssh2_pkt_type(ssh
->pkt_ctx
, st
->pktin
->type
),
1258 st
->pktin
->data
+6, st
->pktin
->length
-6,
1262 crFinish(st
->pktin
);
1265 static void ssh1_pktout_size(struct Packet
*pkt
, int len
)
1269 len
+= 5; /* type and CRC */
1270 pad
= 8 - (len
% 8);
1273 pkt
->length
= len
- 5;
1274 if (pkt
->maxlen
< biglen
) {
1275 pkt
->maxlen
= biglen
;
1276 pkt
->data
= sresize(pkt
->data
, biglen
+ 4 + APIEXTRA
, unsigned char);
1278 pkt
->body
= pkt
->data
+ 4 + pad
+ 1;
1281 static struct Packet
*s_wrpkt_start(int type
, int len
)
1283 struct Packet
*pkt
= ssh_new_packet();
1284 ssh1_pktout_size(pkt
, len
);
1286 /* Initialise log omission state */
1292 static int s_wrpkt_prepare(Ssh ssh
, struct Packet
*pkt
)
1298 * XXX various versions of SC (including 8.8.4) screw up the
1299 * register allocation in this function and use the same register
1300 * (D6) for len and as a temporary, with predictable results. The
1301 * following sledgehammer prevents this.
1307 pkt
->body
[-1] = pkt
->type
;
1310 log_packet(ssh
->logctx
, PKT_OUTGOING
, pkt
->type
,
1311 ssh1_pkt_type(pkt
->type
),
1312 pkt
->body
, pkt
->length
,
1313 pkt
->nblanks
, pkt
->blanks
);
1314 sfree(pkt
->blanks
); pkt
->blanks
= NULL
;
1317 if (ssh
->v1_compressing
) {
1318 unsigned char *compblk
;
1320 zlib_compress_block(ssh
->cs_comp_ctx
,
1321 pkt
->body
- 1, pkt
->length
+ 1,
1322 &compblk
, &complen
);
1323 ssh1_pktout_size(pkt
, complen
- 1);
1324 memcpy(pkt
->body
- 1, compblk
, complen
);
1328 len
= pkt
->length
+ 5; /* type and CRC */
1329 pad
= 8 - (len
% 8);
1332 for (i
= 0; i
< pad
; i
++)
1333 pkt
->data
[i
+ 4] = random_byte();
1334 crc
= crc32_compute(pkt
->data
+ 4, biglen
- 4);
1335 PUT_32BIT(pkt
->data
+ biglen
, crc
);
1336 PUT_32BIT(pkt
->data
, len
);
1339 ssh
->cipher
->encrypt(ssh
->v1_cipher_ctx
, pkt
->data
+ 4, biglen
);
1344 static void s_wrpkt(Ssh ssh
, struct Packet
*pkt
)
1347 len
= s_wrpkt_prepare(ssh
, pkt
);
1348 backlog
= sk_write(ssh
->s
, (char *)pkt
->data
, len
);
1349 if (backlog
> SSH_MAX_BACKLOG
)
1350 ssh_throttle_all(ssh
, 1, backlog
);
1353 static void s_wrpkt_defer(Ssh ssh
, struct Packet
*pkt
)
1356 len
= s_wrpkt_prepare(ssh
, pkt
);
1357 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1358 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1359 ssh
->deferred_send_data
= sresize(ssh
->deferred_send_data
,
1363 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, pkt
->data
, len
);
1364 ssh
->deferred_len
+= len
;
1368 * Construct a packet with the specified contents.
1370 static struct Packet
*construct_packet(Ssh ssh
, int pkttype
,
1371 va_list ap1
, va_list ap2
)
1373 unsigned char *p
, *argp
, argchar
;
1374 unsigned long argint
;
1375 int pktlen
, argtype
, arglen
;
1380 while ((argtype
= va_arg(ap1
, int)) != PKT_END
) {
1383 (void) va_arg(ap1
, int);
1387 (void) va_arg(ap1
, int);
1391 (void) va_arg(ap1
, unsigned char *);
1392 arglen
= va_arg(ap1
, int);
1396 argp
= va_arg(ap1
, unsigned char *);
1397 arglen
= strlen((char *)argp
);
1398 pktlen
+= 4 + arglen
;
1401 bn
= va_arg(ap1
, Bignum
);
1402 pktlen
+= ssh1_bignum_length(bn
);
1407 /* ignore this pass */
1414 pkt
= s_wrpkt_start(pkttype
, pktlen
);
1417 while ((argtype
= va_arg(ap2
, int)) != PKT_END
) {
1418 int offset
= p
- pkt
->body
, len
= 0;
1420 /* Actual fields in the packet */
1422 argint
= va_arg(ap2
, int);
1423 PUT_32BIT(p
, argint
);
1427 argchar
= (unsigned char) va_arg(ap2
, int);
1432 argp
= va_arg(ap2
, unsigned char *);
1433 arglen
= va_arg(ap2
, int);
1434 memcpy(p
, argp
, arglen
);
1438 argp
= va_arg(ap2
, unsigned char *);
1439 arglen
= strlen((char *)argp
);
1440 PUT_32BIT(p
, arglen
);
1441 memcpy(p
+ 4, argp
, arglen
);
1445 bn
= va_arg(ap2
, Bignum
);
1446 len
= ssh1_write_bignum(p
, bn
);
1448 /* Tokens for modifications to packet logging */
1450 dont_log_password(ssh
, pkt
, PKTLOG_BLANK
);
1453 dont_log_data(ssh
, pkt
, PKTLOG_OMIT
);
1456 end_log_omission(ssh
, pkt
);
1460 /* Deal with logfile omission, if required. */
1461 if (len
&& (pkt
->logmode
!= PKTLOG_EMIT
)) {
1463 pkt
->blanks
= sresize(pkt
->blanks
, pkt
->nblanks
,
1465 pkt
->blanks
[pkt
->nblanks
-1].offset
= offset
;
1466 pkt
->blanks
[pkt
->nblanks
-1].len
= len
;
1467 pkt
->blanks
[pkt
->nblanks
-1].type
= pkt
->logmode
;
1474 static void send_packet(Ssh ssh
, int pkttype
, ...)
1478 va_start(ap1
, pkttype
);
1479 va_start(ap2
, pkttype
);
1480 pkt
= construct_packet(ssh
, pkttype
, ap1
, ap2
);
1484 ssh_free_packet(pkt
);
1487 static void defer_packet(Ssh ssh
, int pkttype
, ...)
1491 va_start(ap1
, pkttype
);
1492 va_start(ap2
, pkttype
);
1493 pkt
= construct_packet(ssh
, pkttype
, ap1
, ap2
);
1496 s_wrpkt_defer(ssh
, pkt
);
1497 ssh_free_packet(pkt
);
1500 static int ssh_versioncmp(char *a
, char *b
)
1503 unsigned long av
, bv
;
1505 av
= strtoul(a
, &ae
, 10);
1506 bv
= strtoul(b
, &be
, 10);
1508 return (av
< bv ?
-1 : +1);
1513 av
= strtoul(ae
, &ae
, 10);
1514 bv
= strtoul(be
, &be
, 10);
1516 return (av
< bv ?
-1 : +1);
1521 * Utility routines for putting an SSH-protocol `string' and
1522 * `uint32' into a SHA state.
1525 static void sha_string(SHA_State
* s
, void *str
, int len
)
1527 unsigned char lenblk
[4];
1528 PUT_32BIT(lenblk
, len
);
1529 SHA_Bytes(s
, lenblk
, 4);
1530 SHA_Bytes(s
, str
, len
);
1533 static void sha_uint32(SHA_State
* s
, unsigned i
)
1535 unsigned char intblk
[4];
1536 PUT_32BIT(intblk
, i
);
1537 SHA_Bytes(s
, intblk
, 4);
1541 * SSH2 packet construction functions.
1543 static void ssh2_pkt_ensure(struct Packet
*pkt
, int length
)
1545 if (pkt
->maxlen
< length
) {
1546 pkt
->maxlen
= length
+ 256;
1547 pkt
->data
= sresize(pkt
->data
, pkt
->maxlen
+ APIEXTRA
, unsigned char);
1550 static void ssh2_pkt_adddata(struct Packet
*pkt
, void *data
, int len
)
1552 if (pkt
->logmode
!= PKTLOG_EMIT
) {
1554 pkt
->blanks
= sresize(pkt
->blanks
, pkt
->nblanks
, struct logblank_t
);
1555 pkt
->blanks
[pkt
->nblanks
-1].offset
= pkt
->length
- 6;
1556 pkt
->blanks
[pkt
->nblanks
-1].len
= len
;
1557 pkt
->blanks
[pkt
->nblanks
-1].type
= pkt
->logmode
;
1560 ssh2_pkt_ensure(pkt
, pkt
->length
);
1561 memcpy(pkt
->data
+ pkt
->length
- len
, data
, len
);
1563 static void ssh2_pkt_addbyte(struct Packet
*pkt
, unsigned char byte
)
1565 ssh2_pkt_adddata(pkt
, &byte
, 1);
1567 static struct Packet
*ssh2_pkt_init(int pkt_type
)
1569 struct Packet
*pkt
= ssh_new_packet();
1571 ssh2_pkt_addbyte(pkt
, (unsigned char) pkt_type
);
1574 static void ssh2_pkt_addbool(struct Packet
*pkt
, unsigned char value
)
1576 ssh2_pkt_adddata(pkt
, &value
, 1);
1578 static void ssh2_pkt_adduint32(struct Packet
*pkt
, unsigned long value
)
1581 PUT_32BIT(x
, value
);
1582 ssh2_pkt_adddata(pkt
, x
, 4);
1584 static void ssh2_pkt_addstring_start(struct Packet
*pkt
)
1586 ssh2_pkt_adduint32(pkt
, 0);
1587 pkt
->savedpos
= pkt
->length
;
1589 static void ssh2_pkt_addstring_str(struct Packet
*pkt
, char *data
)
1591 ssh2_pkt_adddata(pkt
, data
, strlen(data
));
1592 PUT_32BIT(pkt
->data
+ pkt
->savedpos
- 4, pkt
->length
- pkt
->savedpos
);
1594 static void ssh2_pkt_addstring_data(struct Packet
*pkt
, char *data
, int len
)
1596 ssh2_pkt_adddata(pkt
, data
, len
);
1597 PUT_32BIT(pkt
->data
+ pkt
->savedpos
- 4, pkt
->length
- pkt
->savedpos
);
1599 static void ssh2_pkt_addstring(struct Packet
*pkt
, char *data
)
1601 ssh2_pkt_addstring_start(pkt
);
1602 ssh2_pkt_addstring_str(pkt
, data
);
1604 static unsigned char *ssh2_mpint_fmt(Bignum b
, int *len
)
1607 int i
, n
= (bignum_bitcount(b
) + 7) / 8;
1608 p
= snewn(n
+ 1, unsigned char);
1610 fatalbox("out of memory");
1612 for (i
= 1; i
<= n
; i
++)
1613 p
[i
] = bignum_byte(b
, n
- i
);
1615 while (i
<= n
&& p
[i
] == 0 && (p
[i
+ 1] & 0x80) == 0)
1617 memmove(p
, p
+ i
, n
+ 1 - i
);
1621 static void ssh2_pkt_addmp(struct Packet
*pkt
, Bignum b
)
1625 p
= ssh2_mpint_fmt(b
, &len
);
1626 ssh2_pkt_addstring_start(pkt
);
1627 ssh2_pkt_addstring_data(pkt
, (char *)p
, len
);
1632 * Construct an SSH2 final-form packet: compress it, encrypt it,
1633 * put the MAC on it. Final packet, ready to be sent, is stored in
1634 * pkt->data. Total length is returned.
1636 static int ssh2_pkt_construct(Ssh ssh
, struct Packet
*pkt
)
1638 int cipherblk
, maclen
, padding
, i
;
1641 log_packet(ssh
->logctx
, PKT_OUTGOING
, pkt
->data
[5],
1642 ssh2_pkt_type(ssh
->pkt_ctx
, pkt
->data
[5]),
1643 pkt
->data
+ 6, pkt
->length
- 6,
1644 pkt
->nblanks
, pkt
->blanks
);
1645 sfree(pkt
->blanks
); pkt
->blanks
= NULL
;
1649 * Compress packet payload.
1652 unsigned char *newpayload
;
1655 ssh
->cscomp
->compress(ssh
->cs_comp_ctx
, pkt
->data
+ 5,
1657 &newpayload
, &newlen
)) {
1659 ssh2_pkt_adddata(pkt
, newpayload
, newlen
);
1665 * Add padding. At least four bytes, and must also bring total
1666 * length (minus MAC) up to a multiple of the block size.
1668 cipherblk
= ssh
->cscipher ? ssh
->cscipher
->blksize
: 8; /* block size */
1669 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
1672 (cipherblk
- (pkt
->length
+ padding
) % cipherblk
) % cipherblk
;
1673 maclen
= ssh
->csmac ? ssh
->csmac
->len
: 0;
1674 ssh2_pkt_ensure(pkt
, pkt
->length
+ padding
+ maclen
);
1675 pkt
->data
[4] = padding
;
1676 for (i
= 0; i
< padding
; i
++)
1677 pkt
->data
[pkt
->length
+ i
] = random_byte();
1678 PUT_32BIT(pkt
->data
, pkt
->length
+ padding
- 4);
1680 ssh
->csmac
->generate(ssh
->cs_mac_ctx
, pkt
->data
,
1681 pkt
->length
+ padding
,
1682 ssh
->v2_outgoing_sequence
);
1683 ssh
->v2_outgoing_sequence
++; /* whether or not we MACed */
1686 ssh
->cscipher
->encrypt(ssh
->cs_cipher_ctx
,
1687 pkt
->data
, pkt
->length
+ padding
);
1689 pkt
->encrypted_len
= pkt
->length
+ padding
;
1691 /* Ready-to-send packet starts at pkt->data. We return length. */
1692 return pkt
->length
+ padding
+ maclen
;
1696 * Routines called from the main SSH code to send packets. There
1697 * are quite a few of these, because we have two separate
1698 * mechanisms for delaying the sending of packets:
1700 * - In order to send an IGNORE message and a password message in
1701 * a single fixed-length blob, we require the ability to
1702 * concatenate the encrypted forms of those two packets _into_ a
1703 * single blob and then pass it to our <network.h> transport
1704 * layer in one go. Hence, there's a deferment mechanism which
1705 * works after packet encryption.
1707 * - In order to avoid sending any connection-layer messages
1708 * during repeat key exchange, we have to queue up any such
1709 * outgoing messages _before_ they are encrypted (and in
1710 * particular before they're allocated sequence numbers), and
1711 * then send them once we've finished.
1713 * I call these mechanisms `defer' and `queue' respectively, so as
1714 * to distinguish them reasonably easily.
1716 * The functions send_noqueue() and defer_noqueue() free the packet
1717 * structure they are passed. Every outgoing packet goes through
1718 * precisely one of these functions in its life; packets passed to
1719 * ssh2_pkt_send() or ssh2_pkt_defer() either go straight to one of
1720 * these or get queued, and then when the queue is later emptied
1721 * the packets are all passed to defer_noqueue().
1725 * Send an SSH2 packet immediately, without queuing or deferring.
1727 static void ssh2_pkt_send_noqueue(Ssh ssh
, struct Packet
*pkt
)
1731 len
= ssh2_pkt_construct(ssh
, pkt
);
1732 backlog
= sk_write(ssh
->s
, (char *)pkt
->data
, len
);
1733 if (backlog
> SSH_MAX_BACKLOG
)
1734 ssh_throttle_all(ssh
, 1, backlog
);
1736 ssh
->outgoing_data_size
+= pkt
->encrypted_len
;
1737 if (!ssh
->kex_in_progress
&&
1738 ssh
->max_data_size
!= 0 &&
1739 ssh
->outgoing_data_size
> ssh
->max_data_size
)
1740 do_ssh2_transport(ssh
, "Initiating key re-exchange "
1741 "(too much data sent)", -1, NULL
);
1743 ssh_free_packet(pkt
);
1747 * Defer an SSH2 packet.
1749 static void ssh2_pkt_defer_noqueue(Ssh ssh
, struct Packet
*pkt
)
1751 int len
= ssh2_pkt_construct(ssh
, pkt
);
1752 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1753 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1754 ssh
->deferred_send_data
= sresize(ssh
->deferred_send_data
,
1758 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, pkt
->data
, len
);
1759 ssh
->deferred_len
+= len
;
1760 ssh
->deferred_data_size
+= pkt
->encrypted_len
;
1761 ssh_free_packet(pkt
);
1765 * Queue an SSH2 packet.
1767 static void ssh2_pkt_queue(Ssh ssh
, struct Packet
*pkt
)
1769 assert(ssh
->queueing
);
1771 if (ssh
->queuelen
>= ssh
->queuesize
) {
1772 ssh
->queuesize
= ssh
->queuelen
+ 32;
1773 ssh
->queue
= sresize(ssh
->queue
, ssh
->queuesize
, struct Packet
*);
1776 ssh
->queue
[ssh
->queuelen
++] = pkt
;
1780 * Either queue or send a packet, depending on whether queueing is
1783 static void ssh2_pkt_send(Ssh ssh
, struct Packet
*pkt
)
1786 ssh2_pkt_queue(ssh
, pkt
);
1788 ssh2_pkt_send_noqueue(ssh
, pkt
);
1792 * Either queue or defer a packet, depending on whether queueing is
1795 static void ssh2_pkt_defer(Ssh ssh
, struct Packet
*pkt
)
1798 ssh2_pkt_queue(ssh
, pkt
);
1800 ssh2_pkt_defer_noqueue(ssh
, pkt
);
1804 * Send the whole deferred data block constructed by
1805 * ssh2_pkt_defer() or SSH1's defer_packet().
1807 * The expected use of the defer mechanism is that you call
1808 * ssh2_pkt_defer() a few times, then call ssh_pkt_defersend(). If
1809 * not currently queueing, this simply sets up deferred_send_data
1810 * and then sends it. If we _are_ currently queueing, the calls to
1811 * ssh2_pkt_defer() put the deferred packets on to the queue
1812 * instead, and therefore ssh_pkt_defersend() has no deferred data
1813 * to send. Hence, there's no need to make it conditional on
1816 static void ssh_pkt_defersend(Ssh ssh
)
1819 backlog
= sk_write(ssh
->s
, (char *)ssh
->deferred_send_data
,
1821 ssh
->deferred_len
= ssh
->deferred_size
= 0;
1822 sfree(ssh
->deferred_send_data
);
1823 ssh
->deferred_send_data
= NULL
;
1824 if (backlog
> SSH_MAX_BACKLOG
)
1825 ssh_throttle_all(ssh
, 1, backlog
);
1827 ssh
->outgoing_data_size
+= ssh
->deferred_data_size
;
1828 if (!ssh
->kex_in_progress
&&
1829 ssh
->max_data_size
!= 0 &&
1830 ssh
->outgoing_data_size
> ssh
->max_data_size
)
1831 do_ssh2_transport(ssh
, "Initiating key re-exchange "
1832 "(too much data sent)", -1, NULL
);
1833 ssh
->deferred_data_size
= 0;
1837 * Send all queued SSH2 packets. We send them by means of
1838 * ssh2_pkt_defer_noqueue(), in case they included a pair of
1839 * packets that needed to be lumped together.
1841 static void ssh2_pkt_queuesend(Ssh ssh
)
1845 assert(!ssh
->queueing
);
1847 for (i
= 0; i
< ssh
->queuelen
; i
++)
1848 ssh2_pkt_defer_noqueue(ssh
, ssh
->queue
[i
]);
1851 ssh_pkt_defersend(ssh
);
1855 void bndebug(char *string
, Bignum b
)
1859 p
= ssh2_mpint_fmt(b
, &len
);
1860 debug(("%s", string
));
1861 for (i
= 0; i
< len
; i
++)
1862 debug((" %02x", p
[i
]));
1868 static void sha_mpint(SHA_State
* s
, Bignum b
)
1872 p
= ssh2_mpint_fmt(b
, &len
);
1873 sha_string(s
, p
, len
);
1878 * Packet decode functions for both SSH1 and SSH2.
1880 static unsigned long ssh_pkt_getuint32(struct Packet
*pkt
)
1882 unsigned long value
;
1883 if (pkt
->length
- pkt
->savedpos
< 4)
1884 return 0; /* arrgh, no way to decline (FIXME?) */
1885 value
= GET_32BIT(pkt
->body
+ pkt
->savedpos
);
1889 static int ssh2_pkt_getbool(struct Packet
*pkt
)
1891 unsigned long value
;
1892 if (pkt
->length
- pkt
->savedpos
< 1)
1893 return 0; /* arrgh, no way to decline (FIXME?) */
1894 value
= pkt
->body
[pkt
->savedpos
] != 0;
1898 static void ssh_pkt_getstring(struct Packet
*pkt
, char **p
, int *length
)
1903 if (pkt
->length
- pkt
->savedpos
< 4)
1905 len
= GET_32BIT(pkt
->body
+ pkt
->savedpos
);
1910 if (pkt
->length
- pkt
->savedpos
< *length
)
1912 *p
= (char *)(pkt
->body
+ pkt
->savedpos
);
1913 pkt
->savedpos
+= *length
;
1915 static void *ssh_pkt_getdata(struct Packet
*pkt
, int length
)
1917 if (pkt
->length
- pkt
->savedpos
< length
)
1919 pkt
->savedpos
+= length
;
1920 return pkt
->body
+ (pkt
->savedpos
- length
);
1922 static int ssh1_pkt_getrsakey(struct Packet
*pkt
, struct RSAKey
*key
,
1923 unsigned char **keystr
)
1927 j
= makekey(pkt
->body
+ pkt
->savedpos
,
1928 pkt
->length
- pkt
->savedpos
,
1935 assert(pkt
->savedpos
< pkt
->length
);
1939 static Bignum
ssh1_pkt_getmp(struct Packet
*pkt
)
1944 j
= ssh1_read_bignum(pkt
->body
+ pkt
->savedpos
,
1945 pkt
->length
- pkt
->savedpos
, &b
);
1953 static Bignum
ssh2_pkt_getmp(struct Packet
*pkt
)
1959 ssh_pkt_getstring(pkt
, &p
, &length
);
1964 b
= bignum_from_bytes((unsigned char *)p
, length
);
1969 * Helper function to add an SSH2 signature blob to a packet.
1970 * Expects to be shown the public key blob as well as the signature
1971 * blob. Normally works just like ssh2_pkt_addstring, but will
1972 * fiddle with the signature packet if necessary for
1973 * BUG_SSH2_RSA_PADDING.
1975 static void ssh2_add_sigblob(Ssh ssh
, struct Packet
*pkt
,
1976 void *pkblob_v
, int pkblob_len
,
1977 void *sigblob_v
, int sigblob_len
)
1979 unsigned char *pkblob
= (unsigned char *)pkblob_v
;
1980 unsigned char *sigblob
= (unsigned char *)sigblob_v
;
1982 /* dmemdump(pkblob, pkblob_len); */
1983 /* dmemdump(sigblob, sigblob_len); */
1986 * See if this is in fact an ssh-rsa signature and a buggy
1987 * server; otherwise we can just do this the easy way.
1989 if ((ssh
->remote_bugs
& BUG_SSH2_RSA_PADDING
) &&
1990 (GET_32BIT(pkblob
) == 7 && !memcmp(pkblob
+4, "ssh-rsa", 7))) {
1991 int pos
, len
, siglen
;
1994 * Find the byte length of the modulus.
1997 pos
= 4+7; /* skip over "ssh-rsa" */
1998 pos
+= 4 + GET_32BIT(pkblob
+pos
); /* skip over exponent */
1999 len
= GET_32BIT(pkblob
+pos
); /* find length of modulus */
2000 pos
+= 4; /* find modulus itself */
2001 while (len
> 0 && pkblob
[pos
] == 0)
2003 /* debug(("modulus length is %d\n", len)); */
2006 * Now find the signature integer.
2008 pos
= 4+7; /* skip over "ssh-rsa" */
2009 siglen
= GET_32BIT(sigblob
+pos
);
2010 /* debug(("signature length is %d\n", siglen)); */
2012 if (len
!= siglen
) {
2013 unsigned char newlen
[4];
2014 ssh2_pkt_addstring_start(pkt
);
2015 ssh2_pkt_addstring_data(pkt
, (char *)sigblob
, pos
);
2016 /* dmemdump(sigblob, pos); */
2017 pos
+= 4; /* point to start of actual sig */
2018 PUT_32BIT(newlen
, len
);
2019 ssh2_pkt_addstring_data(pkt
, (char *)newlen
, 4);
2020 /* dmemdump(newlen, 4); */
2022 while (len
-- > siglen
) {
2023 ssh2_pkt_addstring_data(pkt
, (char *)newlen
, 1);
2024 /* dmemdump(newlen, 1); */
2026 ssh2_pkt_addstring_data(pkt
, (char *)(sigblob
+pos
), siglen
);
2027 /* dmemdump(sigblob+pos, siglen); */
2031 /* Otherwise fall through and do it the easy way. */
2034 ssh2_pkt_addstring_start(pkt
);
2035 ssh2_pkt_addstring_data(pkt
, (char *)sigblob
, sigblob_len
);
2039 * Examine the remote side's version string and compare it against
2040 * a list of known buggy implementations.
2042 static void ssh_detect_bugs(Ssh ssh
, char *vstring
)
2044 char *imp
; /* pointer to implementation part */
2046 imp
+= strcspn(imp
, "-");
2048 imp
+= strcspn(imp
, "-");
2051 ssh
->remote_bugs
= 0;
2053 if (ssh
->cfg
.sshbug_ignore1
== FORCE_ON
||
2054 (ssh
->cfg
.sshbug_ignore1
== AUTO
&&
2055 (!strcmp(imp
, "1.2.18") || !strcmp(imp
, "1.2.19") ||
2056 !strcmp(imp
, "1.2.20") || !strcmp(imp
, "1.2.21") ||
2057 !strcmp(imp
, "1.2.22") || !strcmp(imp
, "Cisco-1.25") ||
2058 !strcmp(imp
, "OSU_1.4alpha3") || !strcmp(imp
, "OSU_1.5alpha4")))) {
2060 * These versions don't support SSH1_MSG_IGNORE, so we have
2061 * to use a different defence against password length
2064 ssh
->remote_bugs
|= BUG_CHOKES_ON_SSH1_IGNORE
;
2065 logevent("We believe remote version has SSH1 ignore bug");
2068 if (ssh
->cfg
.sshbug_plainpw1
== FORCE_ON
||
2069 (ssh
->cfg
.sshbug_plainpw1
== AUTO
&&
2070 (!strcmp(imp
, "Cisco-1.25") || !strcmp(imp
, "OSU_1.4alpha3")))) {
2072 * These versions need a plain password sent; they can't
2073 * handle having a null and a random length of data after
2076 ssh
->remote_bugs
|= BUG_NEEDS_SSH1_PLAIN_PASSWORD
;
2077 logevent("We believe remote version needs a plain SSH1 password");
2080 if (ssh
->cfg
.sshbug_rsa1
== FORCE_ON
||
2081 (ssh
->cfg
.sshbug_rsa1
== AUTO
&&
2082 (!strcmp(imp
, "Cisco-1.25")))) {
2084 * These versions apparently have no clue whatever about
2085 * RSA authentication and will panic and die if they see
2086 * an AUTH_RSA message.
2088 ssh
->remote_bugs
|= BUG_CHOKES_ON_RSA
;
2089 logevent("We believe remote version can't handle RSA authentication");
2092 if (ssh
->cfg
.sshbug_hmac2
== FORCE_ON
||
2093 (ssh
->cfg
.sshbug_hmac2
== AUTO
&&
2094 !wc_match("* VShell", imp
) &&
2095 (wc_match("2.1.0*", imp
) || wc_match("2.0.*", imp
) ||
2096 wc_match("2.2.0*", imp
) || wc_match("2.3.0*", imp
) ||
2097 wc_match("2.1 *", imp
)))) {
2099 * These versions have the HMAC bug.
2101 ssh
->remote_bugs
|= BUG_SSH2_HMAC
;
2102 logevent("We believe remote version has SSH2 HMAC bug");
2105 if (ssh
->cfg
.sshbug_derivekey2
== FORCE_ON
||
2106 (ssh
->cfg
.sshbug_derivekey2
== AUTO
&&
2107 !wc_match("* VShell", imp
) &&
2108 (wc_match("2.0.0*", imp
) || wc_match("2.0.10*", imp
) ))) {
2110 * These versions have the key-derivation bug (failing to
2111 * include the literal shared secret in the hashes that
2112 * generate the keys).
2114 ssh
->remote_bugs
|= BUG_SSH2_DERIVEKEY
;
2115 logevent("We believe remote version has SSH2 key-derivation bug");
2118 if (ssh
->cfg
.sshbug_rsapad2
== FORCE_ON
||
2119 (ssh
->cfg
.sshbug_rsapad2
== AUTO
&&
2120 (wc_match("OpenSSH_2.[5-9]*", imp
) ||
2121 wc_match("OpenSSH_3.[0-2]*", imp
)))) {
2123 * These versions have the SSH2 RSA padding bug.
2125 ssh
->remote_bugs
|= BUG_SSH2_RSA_PADDING
;
2126 logevent("We believe remote version has SSH2 RSA padding bug");
2129 if (ssh
->cfg
.sshbug_pksessid2
== FORCE_ON
||
2130 (ssh
->cfg
.sshbug_pksessid2
== AUTO
&&
2131 wc_match("OpenSSH_2.[0-2]*", imp
))) {
2133 * These versions have the SSH2 session-ID bug in
2134 * public-key authentication.
2136 ssh
->remote_bugs
|= BUG_SSH2_PK_SESSIONID
;
2137 logevent("We believe remote version has SSH2 public-key-session-ID bug");
2142 * The `software version' part of an SSH version string is required
2143 * to contain no spaces or minus signs.
2145 static void ssh_fix_verstring(char *str
)
2147 /* Eat "SSH-<protoversion>-". */
2148 assert(*str
== 'S'); str
++;
2149 assert(*str
== 'S'); str
++;
2150 assert(*str
== 'H'); str
++;
2151 assert(*str
== '-'); str
++;
2152 while (*str
&& *str
!= '-') str
++;
2153 assert(*str
== '-'); str
++;
2155 /* Convert minus signs and spaces in the remaining string into
2158 if (*str
== '-' || *str
== ' ')
2164 static int do_ssh_init(Ssh ssh
, unsigned char c
)
2166 struct do_ssh_init_state
{
2174 crState(do_ssh_init_state
);
2176 crBegin(ssh
->do_ssh_init_crstate
);
2178 /* Search for the string "SSH-" in the input. */
2181 static const int transS
[] = { 1, 2, 2, 1 };
2182 static const int transH
[] = { 0, 0, 3, 0 };
2183 static const int transminus
[] = { 0, 0, 0, -1 };
2185 s
->i
= transS
[s
->i
];
2187 s
->i
= transH
[s
->i
];
2189 s
->i
= transminus
[s
->i
];
2194 crReturn(1); /* get another character */
2198 s
->vstring
= snewn(s
->vstrsize
, char);
2199 strcpy(s
->vstring
, "SSH-");
2203 crReturn(1); /* get another char */
2204 if (s
->vslen
>= s
->vstrsize
- 1) {
2206 s
->vstring
= sresize(s
->vstring
, s
->vstrsize
, char);
2208 s
->vstring
[s
->vslen
++] = c
;
2211 s
->version
[s
->i
] = '\0';
2213 } else if (s
->i
< sizeof(s
->version
) - 1)
2214 s
->version
[s
->i
++] = c
;
2215 } else if (c
== '\012')
2219 ssh
->agentfwd_enabled
= FALSE
;
2220 ssh
->rdpkt2_state
.incoming_sequence
= 0;
2222 s
->vstring
[s
->vslen
] = 0;
2223 s
->vstring
[strcspn(s
->vstring
, "\015\012")] = '\0';/* remove EOL chars */
2226 vlog
= snewn(20 + s
->vslen
, char);
2227 sprintf(vlog
, "Server version: %s", s
->vstring
);
2231 ssh_detect_bugs(ssh
, s
->vstring
);
2234 * Decide which SSH protocol version to support.
2237 /* Anything strictly below "2.0" means protocol 1 is supported. */
2238 s
->proto1
= ssh_versioncmp(s
->version
, "2.0") < 0;
2239 /* Anything greater or equal to "1.99" means protocol 2 is supported. */
2240 s
->proto2
= ssh_versioncmp(s
->version
, "1.99") >= 0;
2242 if (ssh
->cfg
.sshprot
== 0 && !s
->proto1
) {
2243 bombout(("SSH protocol version 1 required by user but not provided by server"));
2246 if (ssh
->cfg
.sshprot
== 3 && !s
->proto2
) {
2247 bombout(("SSH protocol version 2 required by user but not provided by server"));
2254 if (s
->proto2
&& (ssh
->cfg
.sshprot
>= 2 || !s
->proto1
)) {
2256 * Construct a v2 version string.
2258 verstring
= dupprintf("SSH-2.0-%s\015\012", sshver
);
2262 * Construct a v1 version string.
2264 verstring
= dupprintf("SSH-%s-%s\012",
2265 (ssh_versioncmp(s
->version
, "1.5") <= 0 ?
2266 s
->version
: "1.5"),
2271 ssh_fix_verstring(verstring
);
2273 if (ssh
->version
== 2) {
2275 * Hash our version string and their version string.
2277 SHA_Init(&ssh
->exhashbase
);
2278 sha_string(&ssh
->exhashbase
, verstring
,
2279 strcspn(verstring
, "\015\012"));
2280 sha_string(&ssh
->exhashbase
, s
->vstring
,
2281 strcspn(s
->vstring
, "\015\012"));
2284 * Initialise SSHv2 protocol.
2286 ssh
->protocol
= ssh2_protocol
;
2287 ssh2_protocol_setup(ssh
);
2288 ssh
->s_rdpkt
= ssh2_rdpkt
;
2291 * Initialise SSHv1 protocol.
2293 ssh
->protocol
= ssh1_protocol
;
2294 ssh1_protocol_setup(ssh
);
2295 ssh
->s_rdpkt
= ssh1_rdpkt
;
2297 logeventf(ssh
, "We claim version: %.*s",
2298 strcspn(verstring
, "\015\012"), verstring
);
2299 sk_write(ssh
->s
, verstring
, strlen(verstring
));
2303 logeventf(ssh
, "Using SSH protocol version %d", ssh
->version
);
2305 update_specials_menu(ssh
->frontend
);
2306 ssh
->state
= SSH_STATE_BEFORE_SIZE
;
2307 ssh
->pinger
= pinger_new(&ssh
->cfg
, &ssh_backend
, ssh
);
2314 static void ssh_gotdata(Ssh ssh
, unsigned char *data
, int datalen
)
2316 crBegin(ssh
->ssh_gotdata_crstate
);
2319 * To begin with, feed the characters one by one to the
2320 * protocol initialisation / selection function do_ssh_init().
2321 * When that returns 0, we're done with the initial greeting
2322 * exchange and can move on to packet discipline.
2325 int ret
; /* need not be kept across crReturn */
2327 crReturnV
; /* more data please */
2328 ret
= do_ssh_init(ssh
, *data
);
2336 * We emerge from that loop when the initial negotiation is
2337 * over and we have selected an s_rdpkt function. Now pass
2338 * everything to s_rdpkt, and then pass the resulting packets
2339 * to the proper protocol handler.
2344 while (datalen
> 0) {
2345 struct Packet
*pktin
= ssh
->s_rdpkt(ssh
, &data
, &datalen
);
2347 ssh
->protocol(ssh
, NULL
, 0, pktin
);
2348 ssh_free_packet(pktin
);
2350 if (ssh
->state
== SSH_STATE_CLOSED
)
2358 static void ssh_do_close(Ssh ssh
)
2361 struct ssh_channel
*c
;
2363 ssh
->state
= SSH_STATE_CLOSED
;
2367 notify_remote_exit(ssh
->frontend
);
2370 * Now we must shut down any port and X forwardings going
2371 * through this connection.
2373 if (ssh
->channels
) {
2374 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
2377 x11_close(c
->u
.x11
.s
);
2380 pfd_close(c
->u
.pfd
.s
);
2383 del234(ssh
->channels
, c
);
2384 if (ssh
->version
== 2)
2385 bufchain_clear(&c
->v
.v2
.outbuffer
);
2391 static int ssh_closing(Plug plug
, const char *error_msg
, int error_code
,
2394 Ssh ssh
= (Ssh
) plug
;
2397 /* A socket error has occurred. */
2398 logevent(error_msg
);
2399 connection_fatal(ssh
->frontend
, "%s", error_msg
);
2401 /* Otherwise, the remote side closed the connection normally. */
2406 static int ssh_receive(Plug plug
, int urgent
, char *data
, int len
)
2408 Ssh ssh
= (Ssh
) plug
;
2409 ssh_gotdata(ssh
, (unsigned char *)data
, len
);
2410 if (ssh
->state
== SSH_STATE_CLOSED
) {
2417 static void ssh_sent(Plug plug
, int bufsize
)
2419 Ssh ssh
= (Ssh
) plug
;
2421 * If the send backlog on the SSH socket itself clears, we
2422 * should unthrottle the whole world if it was throttled.
2424 if (bufsize
< SSH_MAX_BACKLOG
)
2425 ssh_throttle_all(ssh
, 0, bufsize
);
2429 * Connect to specified host and port.
2430 * Returns an error message, or NULL on success.
2431 * Also places the canonical host name into `realhost'. It must be
2432 * freed by the caller.
2434 static const char *connect_to_host(Ssh ssh
, char *host
, int port
,
2435 char **realhost
, int nodelay
, int keepalive
)
2437 static const struct plug_function_table fn_table
= {
2447 ssh
->savedhost
= snewn(1 + strlen(host
), char);
2448 if (!ssh
->savedhost
)
2449 fatalbox("Out of memory");
2450 strcpy(ssh
->savedhost
, host
);
2453 port
= 22; /* default ssh port */
2454 ssh
->savedport
= port
;
2459 logeventf(ssh
, "Looking up host \"%s\"%s", host
,
2460 (ssh
->cfg
.addressfamily
== ADDRTYPE_IPV4 ?
" (IPv4)" :
2461 (ssh
->cfg
.addressfamily
== ADDRTYPE_IPV6 ?
" (IPv6)" : "")));
2462 addr
= name_lookup(host
, port
, realhost
, &ssh
->cfg
,
2463 ssh
->cfg
.addressfamily
);
2464 if ((err
= sk_addr_error(addr
)) != NULL
) {
2474 sk_getaddr(addr
, addrbuf
, 100);
2475 logeventf(ssh
, "Connecting to %s port %d", addrbuf
, port
);
2477 ssh
->fn
= &fn_table
;
2478 ssh
->s
= new_connection(addr
, *realhost
, port
,
2479 0, 1, nodelay
, keepalive
, (Plug
) ssh
, &ssh
->cfg
);
2480 if ((err
= sk_socket_error(ssh
->s
)) != NULL
) {
2482 notify_remote_exit(ssh
->frontend
);
2490 * Throttle or unthrottle the SSH connection.
2492 static void ssh1_throttle(Ssh ssh
, int adjust
)
2494 int old_count
= ssh
->v1_throttle_count
;
2495 ssh
->v1_throttle_count
+= adjust
;
2496 assert(ssh
->v1_throttle_count
>= 0);
2497 if (ssh
->v1_throttle_count
&& !old_count
) {
2498 sk_set_frozen(ssh
->s
, 1);
2499 } else if (!ssh
->v1_throttle_count
&& old_count
) {
2500 sk_set_frozen(ssh
->s
, 0);
2505 * Throttle or unthrottle _all_ local data streams (for when sends
2506 * on the SSH connection itself back up).
2508 static void ssh_throttle_all(Ssh ssh
, int enable
, int bufsize
)
2511 struct ssh_channel
*c
;
2513 if (enable
== ssh
->throttled_all
)
2515 ssh
->throttled_all
= enable
;
2516 ssh
->overall_bufsize
= bufsize
;
2519 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
2521 case CHAN_MAINSESSION
:
2523 * This is treated separately, outside the switch.
2527 x11_override_throttle(c
->u
.x11
.s
, enable
);
2530 /* Agent channels require no buffer management. */
2533 pfd_override_throttle(c
->u
.pfd
.s
, enable
);
2540 * Username and password input, abstracted off into routines
2541 * reusable in several places - even between SSH1 and SSH2.
2544 /* Set up a username or password input loop on a given buffer. */
2545 static void setup_userpass_input(Ssh ssh
, char *buffer
, int buflen
, int echo
)
2547 ssh
->userpass_input_buffer
= buffer
;
2548 ssh
->userpass_input_buflen
= buflen
;
2549 ssh
->userpass_input_bufpos
= 0;
2550 ssh
->userpass_input_echo
= echo
;
2554 * Process some terminal data in the course of username/password
2555 * input. Returns >0 for success (line of input returned in
2556 * buffer), <0 for failure (user hit ^C/^D, bomb out and exit), 0
2557 * for inconclusive (keep waiting for more input please).
2559 static int process_userpass_input(Ssh ssh
, unsigned char *in
, int inlen
)
2564 switch (c
= *in
++) {
2567 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
] = 0;
2568 ssh
->userpass_input_buffer
[ssh
->userpass_input_buflen
-1] = 0;
2573 if (ssh
->userpass_input_bufpos
> 0) {
2574 if (ssh
->userpass_input_echo
)
2575 c_write_str(ssh
, "\b \b");
2576 ssh
->userpass_input_bufpos
--;
2581 while (ssh
->userpass_input_bufpos
> 0) {
2582 if (ssh
->userpass_input_echo
)
2583 c_write_str(ssh
, "\b \b");
2584 ssh
->userpass_input_bufpos
--;
2593 * This simplistic check for printability is disabled
2594 * when we're doing password input, because some people
2595 * have control characters in their passwords.o
2597 if ((!ssh
->userpass_input_echo
||
2598 (c
>= ' ' && c
<= '~') ||
2599 ((unsigned char) c
>= 160))
2600 && ssh
->userpass_input_bufpos
< ssh
->userpass_input_buflen
-1) {
2601 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
++] = c
;
2602 if (ssh
->userpass_input_echo
)
2603 c_write(ssh
, &c
, 1);
2611 static void ssh_agent_callback(void *sshv
, void *reply
, int replylen
)
2613 Ssh ssh
= (Ssh
) sshv
;
2615 ssh
->agent_response
= reply
;
2616 ssh
->agent_response_len
= replylen
;
2618 if (ssh
->version
== 1)
2619 do_ssh1_login(ssh
, NULL
, -1, NULL
);
2621 do_ssh2_authconn(ssh
, NULL
, -1, NULL
);
2624 static void ssh_agentf_callback(void *cv
, void *reply
, int replylen
)
2626 struct ssh_channel
*c
= (struct ssh_channel
*)cv
;
2628 void *sentreply
= reply
;
2631 /* Fake SSH_AGENT_FAILURE. */
2632 sentreply
= "\0\0\0\1\5";
2635 if (ssh
->version
== 2) {
2636 ssh2_add_channel_data(c
, sentreply
, replylen
);
2639 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
2640 PKT_INT
, c
->remoteid
,
2643 PKT_DATA
, sentreply
, replylen
,
2652 * Handle the key exchange and user authentication phases.
2654 static int do_ssh1_login(Ssh ssh
, unsigned char *in
, int inlen
,
2655 struct Packet
*pktin
)
2658 unsigned char cookie
[8], *ptr
;
2659 struct RSAKey servkey
, hostkey
;
2660 struct MD5Context md5c
;
2661 struct do_ssh1_login_state
{
2663 unsigned char *rsabuf
, *keystr1
, *keystr2
;
2664 unsigned long supported_ciphers_mask
, supported_auths_mask
;
2665 int tried_publickey
, tried_agent
;
2666 int tis_auth_refused
, ccard_auth_refused
;
2667 unsigned char session_id
[16];
2670 void *publickey_blob
;
2671 int publickey_bloblen
;
2677 unsigned char request
[5], *response
, *p
;
2686 crState(do_ssh1_login_state
);
2688 crBegin(ssh
->do_ssh1_login_crstate
);
2693 if (pktin
->type
!= SSH1_SMSG_PUBLIC_KEY
) {
2694 bombout(("Public key packet not received"));
2698 logevent("Received public keys");
2700 ptr
= ssh_pkt_getdata(pktin
, 8);
2702 bombout(("SSH1 public key packet stopped before random cookie"));
2705 memcpy(cookie
, ptr
, 8);
2707 if (!ssh1_pkt_getrsakey(pktin
, &servkey
, &s
->keystr1
) ||
2708 !ssh1_pkt_getrsakey(pktin
, &hostkey
, &s
->keystr2
)) {
2709 bombout(("Failed to read SSH1 public keys from public key packet"));
2714 * Log the host key fingerprint.
2718 logevent("Host key fingerprint is:");
2719 strcpy(logmsg
, " ");
2720 hostkey
.comment
= NULL
;
2721 rsa_fingerprint(logmsg
+ strlen(logmsg
),
2722 sizeof(logmsg
) - strlen(logmsg
), &hostkey
);
2726 ssh
->v1_remote_protoflags
= ssh_pkt_getuint32(pktin
);
2727 s
->supported_ciphers_mask
= ssh_pkt_getuint32(pktin
);
2728 s
->supported_auths_mask
= ssh_pkt_getuint32(pktin
);
2730 ssh
->v1_local_protoflags
=
2731 ssh
->v1_remote_protoflags
& SSH1_PROTOFLAGS_SUPPORTED
;
2732 ssh
->v1_local_protoflags
|= SSH1_PROTOFLAG_SCREEN_NUMBER
;
2735 MD5Update(&md5c
, s
->keystr2
, hostkey
.bytes
);
2736 MD5Update(&md5c
, s
->keystr1
, servkey
.bytes
);
2737 MD5Update(&md5c
, cookie
, 8);
2738 MD5Final(s
->session_id
, &md5c
);
2740 for (i
= 0; i
< 32; i
++)
2741 ssh
->session_key
[i
] = random_byte();
2744 * Verify that the `bits' and `bytes' parameters match.
2746 if (hostkey
.bits
> hostkey
.bytes
* 8 ||
2747 servkey
.bits
> servkey
.bytes
* 8) {
2748 bombout(("SSH1 public keys were badly formatted"));
2752 s
->len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
2754 s
->rsabuf
= snewn(s
->len
, unsigned char);
2756 fatalbox("Out of memory");
2759 * Verify the host key.
2763 * First format the key into a string.
2765 int len
= rsastr_len(&hostkey
);
2766 char fingerprint
[100];
2767 char *keystr
= snewn(len
, char);
2769 fatalbox("Out of memory");
2770 rsastr_fmt(keystr
, &hostkey
);
2771 rsa_fingerprint(fingerprint
, sizeof(fingerprint
), &hostkey
);
2772 verify_ssh_host_key(ssh
->frontend
,
2773 ssh
->savedhost
, ssh
->savedport
, "rsa", keystr
,
2778 for (i
= 0; i
< 32; i
++) {
2779 s
->rsabuf
[i
] = ssh
->session_key
[i
];
2781 s
->rsabuf
[i
] ^= s
->session_id
[i
];
2784 if (hostkey
.bytes
> servkey
.bytes
) {
2785 ret
= rsaencrypt(s
->rsabuf
, 32, &servkey
);
2787 ret
= rsaencrypt(s
->rsabuf
, servkey
.bytes
, &hostkey
);
2789 ret
= rsaencrypt(s
->rsabuf
, 32, &hostkey
);
2791 ret
= rsaencrypt(s
->rsabuf
, hostkey
.bytes
, &servkey
);
2794 bombout(("SSH1 public key encryptions failed due to bad formatting"));
2798 logevent("Encrypted session key");
2801 int cipher_chosen
= 0, warn
= 0;
2802 char *cipher_string
= NULL
;
2804 for (i
= 0; !cipher_chosen
&& i
< CIPHER_MAX
; i
++) {
2805 int next_cipher
= ssh
->cfg
.ssh_cipherlist
[i
];
2806 if (next_cipher
== CIPHER_WARN
) {
2807 /* If/when we choose a cipher, warn about it */
2809 } else if (next_cipher
== CIPHER_AES
) {
2810 /* XXX Probably don't need to mention this. */
2811 logevent("AES not supported in SSH1, skipping");
2813 switch (next_cipher
) {
2814 case CIPHER_3DES
: s
->cipher_type
= SSH_CIPHER_3DES
;
2815 cipher_string
= "3DES"; break;
2816 case CIPHER_BLOWFISH
: s
->cipher_type
= SSH_CIPHER_BLOWFISH
;
2817 cipher_string
= "Blowfish"; break;
2818 case CIPHER_DES
: s
->cipher_type
= SSH_CIPHER_DES
;
2819 cipher_string
= "single-DES"; break;
2821 if (s
->supported_ciphers_mask
& (1 << s
->cipher_type
))
2825 if (!cipher_chosen
) {
2826 if ((s
->supported_ciphers_mask
& (1 << SSH_CIPHER_3DES
)) == 0)
2827 bombout(("Server violates SSH 1 protocol by not "
2828 "supporting 3DES encryption"));
2830 /* shouldn't happen */
2831 bombout(("No supported ciphers found"));
2835 /* Warn about chosen cipher if necessary. */
2837 askalg(ssh
->frontend
, "cipher", cipher_string
);
2840 switch (s
->cipher_type
) {
2841 case SSH_CIPHER_3DES
:
2842 logevent("Using 3DES encryption");
2844 case SSH_CIPHER_DES
:
2845 logevent("Using single-DES encryption");
2847 case SSH_CIPHER_BLOWFISH
:
2848 logevent("Using Blowfish encryption");
2852 send_packet(ssh
, SSH1_CMSG_SESSION_KEY
,
2853 PKT_CHAR
, s
->cipher_type
,
2854 PKT_DATA
, cookie
, 8,
2855 PKT_CHAR
, (s
->len
* 8) >> 8, PKT_CHAR
, (s
->len
* 8) & 0xFF,
2856 PKT_DATA
, s
->rsabuf
, s
->len
,
2857 PKT_INT
, ssh
->v1_local_protoflags
, PKT_END
);
2859 logevent("Trying to enable encryption...");
2863 ssh
->cipher
= (s
->cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish_ssh1
:
2864 s
->cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
2866 ssh
->v1_cipher_ctx
= ssh
->cipher
->make_context();
2867 ssh
->cipher
->sesskey(ssh
->v1_cipher_ctx
, ssh
->session_key
);
2868 logeventf(ssh
, "Initialised %s encryption", ssh
->cipher
->text_name
);
2870 ssh
->crcda_ctx
= crcda_make_context();
2871 logevent("Installing CRC compensation attack detector");
2873 if (servkey
.modulus
) {
2874 sfree(servkey
.modulus
);
2875 servkey
.modulus
= NULL
;
2877 if (servkey
.exponent
) {
2878 sfree(servkey
.exponent
);
2879 servkey
.exponent
= NULL
;
2881 if (hostkey
.modulus
) {
2882 sfree(hostkey
.modulus
);
2883 hostkey
.modulus
= NULL
;
2885 if (hostkey
.exponent
) {
2886 sfree(hostkey
.exponent
);
2887 hostkey
.exponent
= NULL
;
2891 if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
2892 bombout(("Encryption not successfully enabled"));
2896 logevent("Successfully started encryption");
2900 if (!*ssh
->cfg
.username
) {
2901 if (ssh_get_line
&& !ssh_getline_pw_only
) {
2902 if (!ssh_get_line("login as: ",
2903 s
->username
, sizeof(s
->username
), FALSE
)) {
2905 * get_line failed to get a username.
2908 logevent("No username provided. Abandoning session.");
2909 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
2913 int ret
; /* need not be kept over crReturn */
2914 c_write_str(ssh
, "login as: ");
2917 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
2919 crWaitUntil(!pktin
);
2920 ret
= process_userpass_input(ssh
, in
, inlen
);
2924 c_write_str(ssh
, "\r\n");
2927 strncpy(s
->username
, ssh
->cfg
.username
, sizeof(s
->username
));
2928 s
->username
[sizeof(s
->username
)-1] = '\0';
2931 send_packet(ssh
, SSH1_CMSG_USER
, PKT_STR
, s
->username
, PKT_END
);
2933 char userlog
[22 + sizeof(s
->username
)];
2934 sprintf(userlog
, "Sent username \"%s\"", s
->username
);
2936 if (flags
& FLAG_INTERACTIVE
&&
2937 (!((flags
& FLAG_STDERR
) && (flags
& FLAG_VERBOSE
)))) {
2938 strcat(userlog
, "\r\n");
2939 c_write_str(ssh
, userlog
);
2946 if ((ssh
->remote_bugs
& BUG_CHOKES_ON_RSA
)) {
2947 /* We must not attempt PK auth. Pretend we've already tried it. */
2948 s
->tried_publickey
= s
->tried_agent
= 1;
2950 s
->tried_publickey
= s
->tried_agent
= 0;
2952 s
->tis_auth_refused
= s
->ccard_auth_refused
= 0;
2953 /* Load the public half of ssh->cfg.keyfile so we notice if it's in Pageant */
2954 if (!filename_is_null(ssh
->cfg
.keyfile
)) {
2955 if (!rsakey_pubblob(&ssh
->cfg
.keyfile
,
2956 &s
->publickey_blob
, &s
->publickey_bloblen
, NULL
))
2957 s
->publickey_blob
= NULL
;
2959 s
->publickey_blob
= NULL
;
2961 while (pktin
->type
== SSH1_SMSG_FAILURE
) {
2962 s
->pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
2964 if (agent_exists() && !s
->tried_agent
) {
2966 * Attempt RSA authentication using Pageant.
2972 logevent("Pageant is running. Requesting keys.");
2974 /* Request the keys held by the agent. */
2975 PUT_32BIT(s
->request
, 1);
2976 s
->request
[4] = SSH1_AGENTC_REQUEST_RSA_IDENTITIES
;
2977 if (!agent_query(s
->request
, 5, &r
, &s
->responselen
,
2978 ssh_agent_callback
, ssh
)) {
2982 bombout(("Unexpected data from server while waiting"
2983 " for agent response"));
2986 } while (pktin
|| inlen
> 0);
2987 r
= ssh
->agent_response
;
2988 s
->responselen
= ssh
->agent_response_len
;
2990 s
->response
= (unsigned char *) r
;
2991 if (s
->response
&& s
->responselen
>= 5 &&
2992 s
->response
[4] == SSH1_AGENT_RSA_IDENTITIES_ANSWER
) {
2993 s
->p
= s
->response
+ 5;
2994 s
->nkeys
= GET_32BIT(s
->p
);
2998 sprintf(buf
, "Pageant has %d SSH1 keys", s
->nkeys
);
3001 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
3004 sprintf(buf
, "Trying Pageant key #%d", s
->keyi
);
3007 if (s
->publickey_blob
&&
3008 !memcmp(s
->p
, s
->publickey_blob
,
3009 s
->publickey_bloblen
)) {
3010 logevent("This key matches configured key file");
3011 s
->tried_publickey
= 1;
3016 do { /* do while (0) to make breaking easy */
3017 n
= ssh1_read_bignum
3018 (s
->p
, s
->responselen
-(s
->p
-s
->response
),
3023 n
= ssh1_read_bignum
3024 (s
->p
, s
->responselen
-(s
->p
-s
->response
),
3029 if (s
->responselen
- (s
->p
-s
->response
) < 4)
3031 s
->commentlen
= GET_32BIT(s
->p
);
3033 if (s
->responselen
- (s
->p
-s
->response
) <
3036 s
->commentp
= (char *)s
->p
;
3037 s
->p
+= s
->commentlen
;
3041 logevent("Pageant key list packet was truncated");
3045 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
3046 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
3048 if (pktin
->type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
3049 logevent("Key refused");
3052 logevent("Received RSA challenge");
3053 if ((s
->challenge
= ssh1_pkt_getmp(pktin
)) == NULL
) {
3054 bombout(("Server's RSA challenge was badly formatted"));
3059 char *agentreq
, *q
, *ret
;
3062 len
= 1 + 4; /* message type, bit count */
3063 len
+= ssh1_bignum_length(s
->key
.exponent
);
3064 len
+= ssh1_bignum_length(s
->key
.modulus
);
3065 len
+= ssh1_bignum_length(s
->challenge
);
3066 len
+= 16; /* session id */
3067 len
+= 4; /* response format */
3068 agentreq
= snewn(4 + len
, char);
3069 PUT_32BIT(agentreq
, len
);
3071 *q
++ = SSH1_AGENTC_RSA_CHALLENGE
;
3072 PUT_32BIT(q
, bignum_bitcount(s
->key
.modulus
));
3074 q
+= ssh1_write_bignum(q
, s
->key
.exponent
);
3075 q
+= ssh1_write_bignum(q
, s
->key
.modulus
);
3076 q
+= ssh1_write_bignum(q
, s
->challenge
);
3077 memcpy(q
, s
->session_id
, 16);
3079 PUT_32BIT(q
, 1); /* response format */
3080 if (!agent_query(agentreq
, len
+ 4, &vret
, &retlen
,
3081 ssh_agent_callback
, ssh
)) {
3086 bombout(("Unexpected data from server"
3087 " while waiting for agent"
3091 } while (pktin
|| inlen
> 0);
3092 vret
= ssh
->agent_response
;
3093 retlen
= ssh
->agent_response_len
;
3098 if (ret
[4] == SSH1_AGENT_RSA_RESPONSE
) {
3099 logevent("Sending Pageant's response");
3100 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
3101 PKT_DATA
, ret
+ 5, 16,
3105 if (pktin
->type
== SSH1_SMSG_SUCCESS
) {
3107 ("Pageant's response accepted");
3108 if (flags
& FLAG_VERBOSE
) {
3109 c_write_str(ssh
, "Authenticated using"
3111 c_write(ssh
, s
->commentp
,
3113 c_write_str(ssh
, "\" from agent\r\n");
3118 ("Pageant's response not accepted");
3121 ("Pageant failed to answer challenge");
3125 logevent("No reply received from Pageant");
3128 freebn(s
->key
.exponent
);
3129 freebn(s
->key
.modulus
);
3130 freebn(s
->challenge
);
3139 if (!filename_is_null(ssh
->cfg
.keyfile
) && !s
->tried_publickey
)
3140 s
->pwpkt_type
= SSH1_CMSG_AUTH_RSA
;
3142 if (ssh
->cfg
.try_tis_auth
&&
3143 (s
->supported_auths_mask
& (1 << SSH1_AUTH_TIS
)) &&
3144 !s
->tis_auth_refused
) {
3145 s
->pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
3146 logevent("Requested TIS authentication");
3147 send_packet(ssh
, SSH1_CMSG_AUTH_TIS
, PKT_END
);
3149 if (pktin
->type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
3150 logevent("TIS authentication declined");
3151 if (flags
& FLAG_INTERACTIVE
)
3152 c_write_str(ssh
, "TIS authentication refused.\r\n");
3153 s
->tis_auth_refused
= 1;
3159 ssh_pkt_getstring(pktin
, &challenge
, &challengelen
);
3161 bombout(("TIS challenge packet was badly formed"));
3164 logevent("Received TIS challenge");
3165 if (challengelen
> sizeof(s
->prompt
) - 1)
3166 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
3167 memcpy(s
->prompt
, challenge
, challengelen
);
3168 /* Prompt heuristic comes from OpenSSH */
3169 strncpy(s
->prompt
+ challengelen
,
3170 memchr(s
->prompt
, '\n', challengelen
) ?
3171 "": "\r\nResponse: ",
3172 (sizeof s
->prompt
) - challengelen
);
3173 s
->prompt
[(sizeof s
->prompt
) - 1] = '\0';
3176 if (ssh
->cfg
.try_tis_auth
&&
3177 (s
->supported_auths_mask
& (1 << SSH1_AUTH_CCARD
)) &&
3178 !s
->ccard_auth_refused
) {
3179 s
->pwpkt_type
= SSH1_CMSG_AUTH_CCARD_RESPONSE
;
3180 logevent("Requested CryptoCard authentication");
3181 send_packet(ssh
, SSH1_CMSG_AUTH_CCARD
, PKT_END
);
3183 if (pktin
->type
!= SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
3184 logevent("CryptoCard authentication declined");
3185 c_write_str(ssh
, "CryptoCard authentication refused.\r\n");
3186 s
->ccard_auth_refused
= 1;
3192 ssh_pkt_getstring(pktin
, &challenge
, &challengelen
);
3194 bombout(("CryptoCard challenge packet was badly formed"));
3197 logevent("Received CryptoCard challenge");
3198 if (challengelen
> sizeof(s
->prompt
) - 1)
3199 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
3200 memcpy(s
->prompt
, challenge
, challengelen
);
3201 strncpy(s
->prompt
+ challengelen
,
3202 memchr(s
->prompt
, '\n', challengelen
) ?
3203 "" : "\r\nResponse: ",
3204 sizeof(s
->prompt
) - challengelen
);
3205 s
->prompt
[sizeof(s
->prompt
) - 1] = '\0';
3208 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
3209 sprintf(s
->prompt
, "%.90s@%.90s's password: ",
3210 s
->username
, ssh
->savedhost
);
3212 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
3213 char *comment
= NULL
;
3216 if (flags
& FLAG_VERBOSE
)
3217 c_write_str(ssh
, "Trying public key authentication.\r\n");
3218 logeventf(ssh
, "Trying public key \"%s\"",
3219 filename_to_str(&ssh
->cfg
.keyfile
));
3220 type
= key_type(&ssh
->cfg
.keyfile
);
3221 if (type
!= SSH_KEYTYPE_SSH1
) {
3222 sprintf(msgbuf
, "Key is of wrong type (%s)",
3223 key_type_to_str(type
));
3225 c_write_str(ssh
, msgbuf
);
3226 c_write_str(ssh
, "\r\n");
3227 s
->tried_publickey
= 1;
3230 if (!rsakey_encrypted(&ssh
->cfg
.keyfile
, &comment
)) {
3231 if (flags
& FLAG_VERBOSE
)
3232 c_write_str(ssh
, "No passphrase required.\r\n");
3235 sprintf(s
->prompt
, "Passphrase for key \"%.100s\": ", comment
);
3240 * Show password prompt, having first obtained it via a TIS
3241 * or CryptoCard exchange if we're doing TIS or CryptoCard
3245 if (!ssh_get_line(s
->prompt
, s
->password
,
3246 sizeof(s
->password
), TRUE
)) {
3248 * get_line failed to get a password (for example
3249 * because one was supplied on the command line
3250 * which has already failed to work). Terminate.
3252 send_packet(ssh
, SSH1_MSG_DISCONNECT
,
3253 PKT_STR
, "No more passwords available to try",
3255 logevent("Unable to authenticate");
3256 connection_fatal(ssh
->frontend
, "Unable to authenticate");
3257 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
3261 /* Prompt may have come from server. We've munged it a bit, so
3262 * we know it to be zero-terminated at least once. */
3263 int ret
; /* need not be saved over crReturn */
3264 c_write_untrusted(ssh
, s
->prompt
, strlen(s
->prompt
));
3267 setup_userpass_input(ssh
, s
->password
, sizeof(s
->password
), 0);
3269 crWaitUntil(!pktin
);
3270 ret
= process_userpass_input(ssh
, in
, inlen
);
3274 c_write_str(ssh
, "\r\n");
3278 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
3280 * Try public key authentication with the specified
3283 s
->tried_publickey
= 1;
3286 const char *error
= NULL
;
3287 int ret
= loadrsakey(&ssh
->cfg
.keyfile
, &s
->key
, s
->password
,
3290 c_write_str(ssh
, "Couldn't load private key from ");
3291 c_write_str(ssh
, filename_to_str(&ssh
->cfg
.keyfile
));
3292 c_write_str(ssh
, " (");
3293 c_write_str(ssh
, error
);
3294 c_write_str(ssh
, ").\r\n");
3295 continue; /* go and try password */
3298 c_write_str(ssh
, "Wrong passphrase.\r\n");
3299 s
->tried_publickey
= 0;
3300 continue; /* try again */
3305 * Send a public key attempt.
3307 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
3308 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
3311 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3312 c_write_str(ssh
, "Server refused our public key.\r\n");
3313 continue; /* go and try password */
3315 if (pktin
->type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
3316 bombout(("Bizarre response to offer of public key"));
3322 unsigned char buffer
[32];
3323 Bignum challenge
, response
;
3325 if ((challenge
= ssh1_pkt_getmp(pktin
)) == NULL
) {
3326 bombout(("Server's RSA challenge was badly formatted"));
3329 response
= rsadecrypt(challenge
, &s
->key
);
3330 freebn(s
->key
.private_exponent
);/* burn the evidence */
3332 for (i
= 0; i
< 32; i
++) {
3333 buffer
[i
] = bignum_byte(response
, 31 - i
);
3337 MD5Update(&md5c
, buffer
, 32);
3338 MD5Update(&md5c
, s
->session_id
, 16);
3339 MD5Final(buffer
, &md5c
);
3341 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
3342 PKT_DATA
, buffer
, 16, PKT_END
);
3349 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3350 if (flags
& FLAG_VERBOSE
)
3351 c_write_str(ssh
, "Failed to authenticate with"
3352 " our public key.\r\n");
3353 continue; /* go and try password */
3354 } else if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
3355 bombout(("Bizarre response to RSA authentication response"));
3359 break; /* we're through! */
3361 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
3363 * Defence against traffic analysis: we send a
3364 * whole bunch of packets containing strings of
3365 * different lengths. One of these strings is the
3366 * password, in a SSH1_CMSG_AUTH_PASSWORD packet.
3367 * The others are all random data in
3368 * SSH1_MSG_IGNORE packets. This way a passive
3369 * listener can't tell which is the password, and
3370 * hence can't deduce the password length.
3372 * Anybody with a password length greater than 16
3373 * bytes is going to have enough entropy in their
3374 * password that a listener won't find it _that_
3375 * much help to know how long it is. So what we'll
3378 * - if password length < 16, we send 15 packets
3379 * containing string lengths 1 through 15
3381 * - otherwise, we let N be the nearest multiple
3382 * of 8 below the password length, and send 8
3383 * packets containing string lengths N through
3384 * N+7. This won't obscure the order of
3385 * magnitude of the password length, but it will
3386 * introduce a bit of extra uncertainty.
3388 * A few servers (the old 1.2.18 through 1.2.22)
3389 * can't deal with SSH1_MSG_IGNORE. For these
3390 * servers, we need an alternative defence. We make
3391 * use of the fact that the password is interpreted
3392 * as a C string: so we can append a NUL, then some
3395 * One server (a Cisco one) can deal with neither
3396 * SSH1_MSG_IGNORE _nor_ a padded password string.
3397 * For this server we are left with no defences
3398 * against password length sniffing.
3400 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
)) {
3402 * The server can deal with SSH1_MSG_IGNORE, so
3403 * we can use the primary defence.
3405 int bottom
, top
, pwlen
, i
;
3408 pwlen
= strlen(s
->password
);
3410 bottom
= 0; /* zero length passwords are OK! :-) */
3413 bottom
= pwlen
& ~7;
3417 assert(pwlen
>= bottom
&& pwlen
<= top
);
3419 randomstr
= snewn(top
+ 1, char);
3421 for (i
= bottom
; i
<= top
; i
++) {
3423 defer_packet(ssh
, s
->pwpkt_type
,
3424 PKTT_PASSWORD
, PKT_STR
, s
->password
,
3425 PKTT_OTHER
, PKT_END
);
3427 for (j
= 0; j
< i
; j
++) {
3429 randomstr
[j
] = random_byte();
3430 } while (randomstr
[j
] == '\0');
3432 randomstr
[i
] = '\0';
3433 defer_packet(ssh
, SSH1_MSG_IGNORE
,
3434 PKT_STR
, randomstr
, PKT_END
);
3437 logevent("Sending password with camouflage packets");
3438 ssh_pkt_defersend(ssh
);
3441 else if (!(ssh
->remote_bugs
& BUG_NEEDS_SSH1_PLAIN_PASSWORD
)) {
3443 * The server can't deal with SSH1_MSG_IGNORE
3444 * but can deal with padded passwords, so we
3445 * can use the secondary defence.
3451 len
= strlen(s
->password
);
3452 if (len
< sizeof(string
)) {
3454 strcpy(string
, s
->password
);
3455 len
++; /* cover the zero byte */
3456 while (len
< sizeof(string
)) {
3457 string
[len
++] = (char) random_byte();
3462 logevent("Sending length-padded password");
3463 send_packet(ssh
, s
->pwpkt_type
, PKTT_PASSWORD
,
3464 PKT_INT
, len
, PKT_DATA
, ss
, len
,
3465 PKTT_OTHER
, PKT_END
);
3468 * The server has _both_
3469 * BUG_CHOKES_ON_SSH1_IGNORE and
3470 * BUG_NEEDS_SSH1_PLAIN_PASSWORD. There is
3471 * therefore nothing we can do.
3474 len
= strlen(s
->password
);
3475 logevent("Sending unpadded password");
3476 send_packet(ssh
, s
->pwpkt_type
,
3477 PKTT_PASSWORD
, PKT_INT
, len
,
3478 PKT_DATA
, s
->password
, len
,
3479 PKTT_OTHER
, PKT_END
);
3482 send_packet(ssh
, s
->pwpkt_type
, PKTT_PASSWORD
,
3483 PKT_STR
, s
->password
, PKTT_OTHER
, PKT_END
);
3486 logevent("Sent password");
3487 memset(s
->password
, 0, strlen(s
->password
));
3489 if (pktin
->type
== SSH1_SMSG_FAILURE
) {
3490 if (flags
& FLAG_VERBOSE
)
3491 c_write_str(ssh
, "Access denied\r\n");
3492 logevent("Authentication refused");
3493 } else if (pktin
->type
!= SSH1_SMSG_SUCCESS
) {
3494 bombout(("Strange packet received, type %d", pktin
->type
));
3499 logevent("Authentication successful");
3504 void sshfwd_close(struct ssh_channel
*c
)
3508 if (ssh
->state
!= SSH_STATE_SESSION
) {
3509 assert(ssh
->state
== SSH_STATE_CLOSED
);
3513 if (c
&& !c
->closes
) {
3515 * If the channel's remoteid is -1, we have sent
3516 * CHANNEL_OPEN for this channel, but it hasn't even been
3517 * acknowledged by the server. So we must set a close flag
3518 * on it now, and then when the server acks the channel
3519 * open, we can close it then.
3521 if (((int)c
->remoteid
) != -1) {
3522 if (ssh
->version
== 1) {
3523 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
, PKT_INT
, c
->remoteid
,
3526 struct Packet
*pktout
;
3527 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
3528 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
3529 ssh2_pkt_send(ssh
, pktout
);
3532 c
->closes
= 1; /* sent MSG_CLOSE */
3533 if (c
->type
== CHAN_X11
) {
3535 logevent("Forwarded X11 connection terminated");
3536 } else if (c
->type
== CHAN_SOCKDATA
||
3537 c
->type
== CHAN_SOCKDATA_DORMANT
) {
3539 logevent("Forwarded port closed");
3544 int sshfwd_write(struct ssh_channel
*c
, char *buf
, int len
)
3548 if (ssh
->state
!= SSH_STATE_SESSION
) {
3549 assert(ssh
->state
== SSH_STATE_CLOSED
);
3553 if (ssh
->version
== 1) {
3554 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
3555 PKT_INT
, c
->remoteid
,
3557 PKT_INT
, len
, PKT_DATA
, buf
, len
,
3558 PKTT_OTHER
, PKT_END
);
3560 * In SSH1 we can return 0 here - implying that forwarded
3561 * connections are never individually throttled - because
3562 * the only circumstance that can cause throttling will be
3563 * the whole SSH connection backing up, in which case
3564 * _everything_ will be throttled as a whole.
3568 ssh2_add_channel_data(c
, buf
, len
);
3569 return ssh2_try_send(c
);
3573 void sshfwd_unthrottle(struct ssh_channel
*c
, int bufsize
)
3577 if (ssh
->state
!= SSH_STATE_SESSION
) {
3578 assert(ssh
->state
== SSH_STATE_CLOSED
);
3582 if (ssh
->version
== 1) {
3583 if (c
->v
.v1
.throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
3584 c
->v
.v1
.throttling
= 0;
3585 ssh1_throttle(ssh
, -1);
3588 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
3592 static void ssh_queueing_handler(Ssh ssh
, struct Packet
*pktin
)
3594 struct queued_handler
*qh
= ssh
->qhead
;
3598 assert(pktin
->type
== qh
->msg1
|| pktin
->type
== qh
->msg2
);
3601 assert(ssh
->packet_dispatch
[qh
->msg1
] == ssh_queueing_handler
);
3602 ssh
->packet_dispatch
[qh
->msg1
] = NULL
;
3605 assert(ssh
->packet_dispatch
[qh
->msg2
] == ssh_queueing_handler
);
3606 ssh
->packet_dispatch
[qh
->msg2
] = NULL
;
3610 ssh
->qhead
= qh
->next
;
3612 if (ssh
->qhead
->msg1
> 0) {
3613 assert(ssh
->packet_dispatch
[ssh
->qhead
->msg1
] == NULL
);
3614 ssh
->packet_dispatch
[ssh
->qhead
->msg1
] = ssh_queueing_handler
;
3616 if (ssh
->qhead
->msg2
> 0) {
3617 assert(ssh
->packet_dispatch
[ssh
->qhead
->msg2
] == NULL
);
3618 ssh
->packet_dispatch
[ssh
->qhead
->msg2
] = ssh_queueing_handler
;
3621 ssh
->qhead
= ssh
->qtail
= NULL
;
3622 ssh
->packet_dispatch
[pktin
->type
] = NULL
;
3625 qh
->handler(ssh
, pktin
, qh
->ctx
);
3630 static void ssh_queue_handler(Ssh ssh
, int msg1
, int msg2
,
3631 chandler_fn_t handler
, void *ctx
)
3633 struct queued_handler
*qh
;
3635 qh
= snew(struct queued_handler
);
3638 qh
->handler
= handler
;
3642 if (ssh
->qtail
== NULL
) {
3646 assert(ssh
->packet_dispatch
[qh
->msg1
] == NULL
);
3647 ssh
->packet_dispatch
[qh
->msg1
] = ssh_queueing_handler
;
3650 assert(ssh
->packet_dispatch
[qh
->msg2
] == NULL
);
3651 ssh
->packet_dispatch
[qh
->msg2
] = ssh_queueing_handler
;
3654 ssh
->qtail
->next
= qh
;
3659 static void ssh_rportfwd_succfail(Ssh ssh
, struct Packet
*pktin
, void *ctx
)
3661 struct ssh_rportfwd
*rpf
, *pf
= (struct ssh_rportfwd
*)ctx
;
3663 if (pktin
->type
== (ssh
->version
== 1 ? SSH1_SMSG_SUCCESS
:
3664 SSH2_MSG_REQUEST_SUCCESS
)) {
3665 logeventf(ssh
, "Remote port forwarding from %s enabled",
3668 logeventf(ssh
, "Remote port forwarding from %s refused",
3671 rpf
= del234(ssh
->rportfwds
, pf
);
3677 static void ssh_setup_portfwd(Ssh ssh
, const Config
*cfg
)
3679 const char *portfwd_strptr
= cfg
->portfwd
;
3680 struct ssh_portfwd
*epf
;
3683 if (!ssh
->portfwds
) {
3684 ssh
->portfwds
= newtree234(ssh_portcmp
);
3687 * Go through the existing port forwardings and tag them
3688 * with status==DESTROY. Any that we want to keep will be
3689 * re-enabled (status==KEEP) as we go through the
3690 * configuration and find out which bits are the same as
3693 struct ssh_portfwd
*epf
;
3695 for (i
= 0; (epf
= index234(ssh
->portfwds
, i
)) != NULL
; i
++)
3696 epf
->status
= DESTROY
;
3699 while (*portfwd_strptr
) {
3700 char address_family
, type
;
3701 int sport
,dport
,sserv
,dserv
;
3702 char sports
[256], dports
[256], saddr
[256], host
[256];
3705 address_family
= 'A';
3707 if (*portfwd_strptr
== 'A' ||
3708 *portfwd_strptr
== '4' ||
3709 *portfwd_strptr
== '6')
3710 address_family
= *portfwd_strptr
++;
3711 if (*portfwd_strptr
== 'L' ||
3712 *portfwd_strptr
== 'R' ||
3713 *portfwd_strptr
== 'D')
3714 type
= *portfwd_strptr
++;
3719 while (*portfwd_strptr
&& *portfwd_strptr
!= '\t') {
3720 if (*portfwd_strptr
== ':') {
3722 * We've seen a colon in the middle of the
3723 * source port number. This means that
3724 * everything we've seen until now is the
3725 * source _address_, so we'll move it into
3726 * saddr and start sports from the beginning
3731 if (ssh
->version
== 1 && type
== 'R') {
3732 logeventf(ssh
, "SSH1 cannot handle remote source address "
3733 "spec \"%s\"; ignoring", sports
);
3735 strcpy(saddr
, sports
);
3738 if (n
< 255) sports
[n
++] = *portfwd_strptr
++;
3742 if (*portfwd_strptr
== '\t')
3745 while (*portfwd_strptr
&& *portfwd_strptr
!= ':') {
3746 if (n
< 255) host
[n
++] = *portfwd_strptr
++;
3749 if (*portfwd_strptr
== ':')
3752 while (*portfwd_strptr
) {
3753 if (n
< 255) dports
[n
++] = *portfwd_strptr
++;
3757 dport
= atoi(dports
);
3761 dport
= net_service_lookup(dports
);
3763 logeventf(ssh
, "Service lookup failed for destination"
3764 " port \"%s\"", dports
);
3768 while (*portfwd_strptr
) portfwd_strptr
++;
3770 portfwd_strptr
++; /* eat the NUL and move to next one */
3772 sport
= atoi(sports
);
3776 sport
= net_service_lookup(sports
);
3778 logeventf(ssh
, "Service lookup failed for source"
3779 " port \"%s\"", sports
);
3782 if (sport
&& dport
) {
3783 /* Set up a description of the source port. */
3784 struct ssh_portfwd
*pfrec
, *epfrec
;
3786 pfrec
= snew(struct ssh_portfwd
);
3788 pfrec
->saddr
= *saddr ?
dupstr(saddr
) : NULL
;
3789 pfrec
->sserv
= sserv ?
dupstr(sports
) : NULL
;
3790 pfrec
->sport
= sport
;
3791 pfrec
->daddr
= *host ?
dupstr(host
) : NULL
;
3792 pfrec
->dserv
= dserv ?
dupstr(dports
) : NULL
;
3793 pfrec
->dport
= dport
;
3794 pfrec
->local
= NULL
;
3795 pfrec
->remote
= NULL
;
3796 pfrec
->addressfamily
= (address_family
== '4' ? ADDRTYPE_IPV4
:
3797 address_family
== '6' ? ADDRTYPE_IPV6
:
3800 epfrec
= add234(ssh
->portfwds
, pfrec
);
3801 if (epfrec
!= pfrec
) {
3803 * We already have a port forwarding with precisely
3804 * these parameters. Hence, no need to do anything;
3805 * simply tag the existing one as KEEP.
3807 epfrec
->status
= KEEP
;
3808 free_portfwd(pfrec
);
3810 pfrec
->status
= CREATE
;
3816 * Now go through and destroy any port forwardings which were
3819 for (i
= 0; (epf
= index234(ssh
->portfwds
, i
)) != NULL
; i
++)
3820 if (epf
->status
== DESTROY
) {
3823 message
= dupprintf("%s port forwarding from %s%s%d",
3824 epf
->type
== 'L' ?
"local" :
3825 epf
->type
== 'R' ?
"remote" : "dynamic",
3826 epf
->saddr ? epf
->saddr
: "",
3827 epf
->saddr ?
":" : "",
3830 if (epf
->type
!= 'D') {
3831 char *msg2
= dupprintf("%s to %s:%d", message
,
3832 epf
->daddr
, epf
->dport
);
3837 logeventf(ssh
, "Cancelling %s", message
);
3841 struct ssh_rportfwd
*rpf
= epf
->remote
;
3842 struct Packet
*pktout
;
3845 * Cancel the port forwarding at the server
3848 if (ssh
->version
== 1) {
3850 * We cannot cancel listening ports on the
3851 * server side in SSH1! There's no message
3852 * to support it. Instead, we simply remove
3853 * the rportfwd record from the local end
3854 * so that any connections the server tries
3855 * to make on it are rejected.
3858 pktout
= ssh2_pkt_init(SSH2_MSG_GLOBAL_REQUEST
);
3859 ssh2_pkt_addstring(pktout
, "cancel-tcpip-forward");
3860 ssh2_pkt_addbool(pktout
, 0);/* _don't_ want reply */
3862 ssh2_pkt_addstring(pktout
, epf
->saddr
);
3863 } else if (ssh
->cfg
.rport_acceptall
) {
3864 ssh2_pkt_addstring(pktout
, "0.0.0.0");
3866 ssh2_pkt_addstring(pktout
, "127.0.0.1");
3868 ssh2_pkt_adduint32(pktout
, epf
->sport
);
3869 ssh2_pkt_send(ssh
, pktout
);
3872 del234(ssh
->rportfwds
, rpf
);
3874 } else if (epf
->local
) {
3875 pfd_terminate(epf
->local
);
3878 delpos234(ssh
->portfwds
, i
);
3880 i
--; /* so we don't skip one in the list */
3884 * And finally, set up any new port forwardings (status==CREATE).
3886 for (i
= 0; (epf
= index234(ssh
->portfwds
, i
)) != NULL
; i
++)
3887 if (epf
->status
== CREATE
) {
3888 char *sportdesc
, *dportdesc
;
3889 sportdesc
= dupprintf("%s%s%s%s%d%s",
3890 epf
->saddr ? epf
->saddr
: "",
3891 epf
->saddr ?
":" : "",
3892 epf
->sserv ? epf
->sserv
: "",
3893 epf
->sserv ?
"(" : "",
3895 epf
->sserv ?
")" : "");
3896 if (epf
->type
== 'D') {
3899 dportdesc
= dupprintf("%s:%s%s%d%s",
3901 epf
->dserv ? epf
->dserv
: "",
3902 epf
->dserv ?
"(" : "",
3904 epf
->dserv ?
")" : "");
3907 if (epf
->type
== 'L') {
3908 const char *err
= pfd_addforward(epf
->daddr
, epf
->dport
,
3909 epf
->saddr
, epf
->sport
,
3912 epf
->addressfamily
);
3914 logeventf(ssh
, "Local %sport %s forwarding to %s%s%s",
3915 epf
->addressfamily
== ADDRTYPE_IPV4 ?
"IPv4 " :
3916 epf
->addressfamily
== ADDRTYPE_IPV6 ?
"IPv6 " : "",
3917 sportdesc
, dportdesc
,
3918 err ?
" failed: " : "", err ? err
: "");
3919 } else if (epf
->type
== 'D') {
3920 const char *err
= pfd_addforward(NULL
, -1,
3921 epf
->saddr
, epf
->sport
,
3924 epf
->addressfamily
);
3926 logeventf(ssh
, "Local %sport %s SOCKS dynamic forwarding%s%s",
3927 epf
->addressfamily
== ADDRTYPE_IPV4 ?
"IPv4 " :
3928 epf
->addressfamily
== ADDRTYPE_IPV6 ?
"IPv6 " : "",
3930 err ?
" failed: " : "", err ? err
: "");
3932 struct ssh_rportfwd
*pf
;
3935 * Ensure the remote port forwardings tree exists.
3937 if (!ssh
->rportfwds
) {
3938 if (ssh
->version
== 1)
3939 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh1
);
3941 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh2
);
3944 pf
= snew(struct ssh_rportfwd
);
3945 strncpy(pf
->dhost
, epf
->daddr
, lenof(pf
->dhost
)-1);
3946 pf
->dhost
[lenof(pf
->dhost
)-1] = '\0';
3947 pf
->dport
= epf
->dport
;
3948 pf
->sport
= epf
->sport
;
3949 if (add234(ssh
->rportfwds
, pf
) != pf
) {
3950 logeventf(ssh
, "Duplicate remote port forwarding to %s:%d",
3951 epf
->daddr
, epf
->dport
);
3954 logeventf(ssh
, "Requesting remote port %s"
3955 " forward to %s", sportdesc
, dportdesc
);
3957 pf
->sportdesc
= sportdesc
;
3962 if (ssh
->version
== 1) {
3963 send_packet(ssh
, SSH1_CMSG_PORT_FORWARD_REQUEST
,
3964 PKT_INT
, epf
->sport
,
3965 PKT_STR
, epf
->daddr
,
3966 PKT_INT
, epf
->dport
,
3968 ssh_queue_handler(ssh
, SSH1_SMSG_SUCCESS
,
3970 ssh_rportfwd_succfail
, pf
);
3972 struct Packet
*pktout
;
3973 pktout
= ssh2_pkt_init(SSH2_MSG_GLOBAL_REQUEST
);
3974 ssh2_pkt_addstring(pktout
, "tcpip-forward");
3975 ssh2_pkt_addbool(pktout
, 1);/* want reply */
3977 ssh2_pkt_addstring(pktout
, epf
->saddr
);
3978 } else if (ssh
->cfg
.rport_acceptall
) {
3979 ssh2_pkt_addstring(pktout
, "0.0.0.0");
3981 ssh2_pkt_addstring(pktout
, "127.0.0.1");
3983 ssh2_pkt_adduint32(pktout
, epf
->sport
);
3984 ssh2_pkt_send(ssh
, pktout
);
3986 ssh_queue_handler(ssh
, SSH2_MSG_REQUEST_SUCCESS
,
3987 SSH2_MSG_REQUEST_FAILURE
,
3988 ssh_rportfwd_succfail
, pf
);
3997 static void ssh1_smsg_stdout_stderr_data(Ssh ssh
, struct Packet
*pktin
)
4000 int stringlen
, bufsize
;
4002 ssh_pkt_getstring(pktin
, &string
, &stringlen
);
4003 if (string
== NULL
) {
4004 bombout(("Incoming terminal data packet was badly formed"));
4008 bufsize
= from_backend(ssh
->frontend
, pktin
->type
== SSH1_SMSG_STDERR_DATA
,
4010 if (!ssh
->v1_stdout_throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
4011 ssh
->v1_stdout_throttling
= 1;
4012 ssh1_throttle(ssh
, +1);
4016 static void ssh1_smsg_x11_open(Ssh ssh
, struct Packet
*pktin
)
4018 /* Remote side is trying to open a channel to talk to our
4019 * X-Server. Give them back a local channel number. */
4020 struct ssh_channel
*c
;
4021 int remoteid
= ssh_pkt_getuint32(pktin
);
4023 logevent("Received X11 connect request");
4024 /* Refuse if X11 forwarding is disabled. */
4025 if (!ssh
->X11_fwd_enabled
) {
4026 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4027 PKT_INT
, remoteid
, PKT_END
);
4028 logevent("Rejected X11 connect request");
4030 c
= snew(struct ssh_channel
);
4033 if (x11_init(&c
->u
.x11
.s
, ssh
->cfg
.x11_display
, c
,
4034 ssh
->x11auth
, NULL
, -1, &ssh
->cfg
) != NULL
) {
4035 logevent("Opening X11 forward connection failed");
4037 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4038 PKT_INT
, remoteid
, PKT_END
);
4041 ("Opening X11 forward connection succeeded");
4042 c
->remoteid
= remoteid
;
4043 c
->localid
= alloc_channel_id(ssh
);
4045 c
->v
.v1
.throttling
= 0;
4046 c
->type
= CHAN_X11
; /* identify channel type */
4047 add234(ssh
->channels
, c
);
4048 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
4049 PKT_INT
, c
->remoteid
, PKT_INT
,
4050 c
->localid
, PKT_END
);
4051 logevent("Opened X11 forward channel");
4056 static void ssh1_smsg_agent_open(Ssh ssh
, struct Packet
*pktin
)
4058 /* Remote side is trying to open a channel to talk to our
4059 * agent. Give them back a local channel number. */
4060 struct ssh_channel
*c
;
4061 int remoteid
= ssh_pkt_getuint32(pktin
);
4063 /* Refuse if agent forwarding is disabled. */
4064 if (!ssh
->agentfwd_enabled
) {
4065 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4066 PKT_INT
, remoteid
, PKT_END
);
4068 c
= snew(struct ssh_channel
);
4070 c
->remoteid
= remoteid
;
4071 c
->localid
= alloc_channel_id(ssh
);
4073 c
->v
.v1
.throttling
= 0;
4074 c
->type
= CHAN_AGENT
; /* identify channel type */
4075 c
->u
.a
.lensofar
= 0;
4076 add234(ssh
->channels
, c
);
4077 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
4078 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
4083 static void ssh1_msg_port_open(Ssh ssh
, struct Packet
*pktin
)
4085 /* Remote side is trying to open a channel to talk to a
4086 * forwarded port. Give them back a local channel number. */
4087 struct ssh_channel
*c
;
4088 struct ssh_rportfwd pf
, *pfp
;
4091 char *host
, buf
[1024];
4093 c
= snew(struct ssh_channel
);
4096 remoteid
= ssh_pkt_getuint32(pktin
);
4097 ssh_pkt_getstring(pktin
, &host
, &hostsize
);
4098 port
= ssh_pkt_getuint32(pktin
);
4100 if (hostsize
>= lenof(pf
.dhost
))
4101 hostsize
= lenof(pf
.dhost
)-1;
4102 memcpy(pf
.dhost
, host
, hostsize
);
4103 pf
.dhost
[hostsize
] = '\0';
4105 pfp
= find234(ssh
->rportfwds
, &pf
, NULL
);
4108 sprintf(buf
, "Rejected remote port open request for %s:%d",
4111 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4112 PKT_INT
, remoteid
, PKT_END
);
4114 sprintf(buf
, "Received remote port open request for %s:%d",
4117 e
= pfd_newconnect(&c
->u
.pfd
.s
, pf
.dhost
, port
,
4118 c
, &ssh
->cfg
, pfp
->pfrec
->addressfamily
);
4121 sprintf(buf
, "Port open failed: %s", e
);
4124 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
4125 PKT_INT
, remoteid
, PKT_END
);
4127 c
->remoteid
= remoteid
;
4128 c
->localid
= alloc_channel_id(ssh
);
4130 c
->v
.v1
.throttling
= 0;
4131 c
->type
= CHAN_SOCKDATA
; /* identify channel type */
4132 add234(ssh
->channels
, c
);
4133 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
4134 PKT_INT
, c
->remoteid
, PKT_INT
,
4135 c
->localid
, PKT_END
);
4136 logevent("Forwarded port opened successfully");
4141 static void ssh1_msg_channel_open_confirmation(Ssh ssh
, struct Packet
*pktin
)
4143 unsigned int remoteid
= ssh_pkt_getuint32(pktin
);
4144 unsigned int localid
= ssh_pkt_getuint32(pktin
);
4145 struct ssh_channel
*c
;
4147 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
4148 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
4149 c
->remoteid
= localid
;
4150 c
->type
= CHAN_SOCKDATA
;
4151 c
->v
.v1
.throttling
= 0;
4152 pfd_confirm(c
->u
.pfd
.s
);
4155 if (c
&& c
->closes
) {
4157 * We have a pending close on this channel,
4158 * which we decided on before the server acked
4159 * the channel open. So now we know the
4160 * remoteid, we can close it again.
4162 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
,
4163 PKT_INT
, c
->remoteid
, PKT_END
);
4167 static void ssh1_msg_channel_open_failure(Ssh ssh
, struct Packet
*pktin
)
4169 unsigned int remoteid
= ssh_pkt_getuint32(pktin
);
4170 struct ssh_channel
*c
;
4172 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
4173 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
4174 logevent("Forwarded connection refused by server");
4175 pfd_close(c
->u
.pfd
.s
);
4176 del234(ssh
->channels
, c
);
4181 static void ssh1_msg_channel_close(Ssh ssh
, struct Packet
*pktin
)
4183 /* Remote side closes a channel. */
4184 unsigned i
= ssh_pkt_getuint32(pktin
);
4185 struct ssh_channel
*c
;
4186 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
4187 if (c
&& ((int)c
->remoteid
) != -1) {
4190 (pktin
->type
== SSH1_MSG_CHANNEL_CLOSE ?
1 : 2);
4192 if ((c
->closes
== 0) && (c
->type
== CHAN_X11
)) {
4193 logevent("Forwarded X11 connection terminated");
4194 assert(c
->u
.x11
.s
!= NULL
);
4195 x11_close(c
->u
.x11
.s
);
4198 if ((c
->closes
== 0) && (c
->type
== CHAN_SOCKDATA
)) {
4199 logevent("Forwarded port closed");
4200 assert(c
->u
.pfd
.s
!= NULL
);
4201 pfd_close(c
->u
.pfd
.s
);
4205 c
->closes
|= (closetype
<< 2); /* seen this message */
4206 if (!(c
->closes
& closetype
)) {
4207 send_packet(ssh
, pktin
->type
, PKT_INT
, c
->remoteid
,
4209 c
->closes
|= closetype
; /* sent it too */
4212 if (c
->closes
== 15) {
4213 del234(ssh
->channels
, c
);
4217 bombout(("Received CHANNEL_CLOSE%s for %s channel %d\n",
4218 pktin
->type
== SSH1_MSG_CHANNEL_CLOSE ?
"" :
4219 "_CONFIRMATION", c ?
"half-open" : "nonexistent",
4224 static void ssh1_msg_channel_data(Ssh ssh
, struct Packet
*pktin
)
4226 /* Data sent down one of our channels. */
4227 int i
= ssh_pkt_getuint32(pktin
);
4230 struct ssh_channel
*c
;
4232 ssh_pkt_getstring(pktin
, &p
, &len
);
4234 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
4239 bufsize
= x11_send(c
->u
.x11
.s
, p
, len
);
4242 bufsize
= pfd_send(c
->u
.pfd
.s
, p
, len
);
4245 /* Data for an agent message. Buffer it. */
4247 if (c
->u
.a
.lensofar
< 4) {
4248 unsigned int l
= min(4 - c
->u
.a
.lensofar
, len
);
4249 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
, p
,
4253 c
->u
.a
.lensofar
+= l
;
4255 if (c
->u
.a
.lensofar
== 4) {
4257 4 + GET_32BIT(c
->u
.a
.msglen
);
4258 c
->u
.a
.message
= snewn(c
->u
.a
.totallen
,
4260 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
4262 if (c
->u
.a
.lensofar
>= 4 && len
> 0) {
4264 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
4266 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
, p
,
4270 c
->u
.a
.lensofar
+= l
;
4272 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
4275 if (agent_query(c
->u
.a
.message
,
4278 ssh_agentf_callback
, c
))
4279 ssh_agentf_callback(c
, reply
, replylen
);
4280 sfree(c
->u
.a
.message
);
4281 c
->u
.a
.lensofar
= 0;
4284 bufsize
= 0; /* agent channels never back up */
4287 if (!c
->v
.v1
.throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
4288 c
->v
.v1
.throttling
= 1;
4289 ssh1_throttle(ssh
, +1);
4294 static void ssh1_smsg_exit_status(Ssh ssh
, struct Packet
*pktin
)
4297 ssh
->exitcode
= ssh_pkt_getuint32(pktin
);
4298 sprintf(buf
, "Server sent command exit status %d",
4301 send_packet(ssh
, SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
4303 * In case `helpful' firewalls or proxies tack
4304 * extra human-readable text on the end of the
4305 * session which we might mistake for another
4306 * encrypted packet, we close the session once
4307 * we've sent EXIT_CONFIRMATION.
4309 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
4312 static void do_ssh1_connection(Ssh ssh
, unsigned char *in
, int inlen
,
4313 struct Packet
*pktin
)
4315 crBegin(ssh
->do_ssh1_connection_crstate
);
4317 ssh
->packet_dispatch
[SSH1_SMSG_STDOUT_DATA
] =
4318 ssh
->packet_dispatch
[SSH1_SMSG_STDERR_DATA
] =
4319 ssh1_smsg_stdout_stderr_data
;
4321 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
] =
4322 ssh1_msg_channel_open_confirmation
;
4323 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_OPEN_FAILURE
] =
4324 ssh1_msg_channel_open_failure
;
4325 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_CLOSE
] =
4326 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
] =
4327 ssh1_msg_channel_close
;
4328 ssh
->packet_dispatch
[SSH1_MSG_CHANNEL_DATA
] = ssh1_msg_channel_data
;
4329 ssh
->packet_dispatch
[SSH1_SMSG_EXIT_STATUS
] = ssh1_smsg_exit_status
;
4331 if (ssh
->cfg
.agentfwd
&& agent_exists()) {
4332 logevent("Requesting agent forwarding");
4333 send_packet(ssh
, SSH1_CMSG_AGENT_REQUEST_FORWARDING
, PKT_END
);
4337 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4338 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4339 bombout(("Protocol confusion"));
4341 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4342 logevent("Agent forwarding refused");
4344 logevent("Agent forwarding enabled");
4345 ssh
->agentfwd_enabled
= TRUE
;
4346 ssh
->packet_dispatch
[SSH1_SMSG_AGENT_OPEN
] = ssh1_smsg_agent_open
;
4350 if (ssh
->cfg
.x11_forward
) {
4351 char proto
[20], data
[64];
4352 logevent("Requesting X11 forwarding");
4353 ssh
->x11auth
= x11_invent_auth(proto
, sizeof(proto
),
4354 data
, sizeof(data
), ssh
->cfg
.x11_auth
);
4355 x11_get_real_auth(ssh
->x11auth
, ssh
->cfg
.x11_display
);
4356 if (ssh
->v1_local_protoflags
& SSH1_PROTOFLAG_SCREEN_NUMBER
) {
4357 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
4358 PKT_STR
, proto
, PKT_STR
, data
,
4359 PKT_INT
, x11_get_screen_number(ssh
->cfg
.x11_display
),
4362 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
4363 PKT_STR
, proto
, PKT_STR
, data
, PKT_END
);
4368 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4369 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4370 bombout(("Protocol confusion"));
4372 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4373 logevent("X11 forwarding refused");
4375 logevent("X11 forwarding enabled");
4376 ssh
->X11_fwd_enabled
= TRUE
;
4377 ssh
->packet_dispatch
[SSH1_SMSG_X11_OPEN
] = ssh1_smsg_x11_open
;
4381 ssh_setup_portfwd(ssh
, &ssh
->cfg
);
4382 ssh
->packet_dispatch
[SSH1_MSG_PORT_OPEN
] = ssh1_msg_port_open
;
4384 if (!ssh
->cfg
.nopty
) {
4385 /* Unpick the terminal-speed string. */
4386 /* XXX perhaps we should allow no speeds to be sent. */
4387 ssh
->ospeed
= 38400; ssh
->ispeed
= 38400; /* last-resort defaults */
4388 sscanf(ssh
->cfg
.termspeed
, "%d,%d", &ssh
->ospeed
, &ssh
->ispeed
);
4389 /* Send the pty request. */
4390 send_packet(ssh
, SSH1_CMSG_REQUEST_PTY
,
4391 PKT_STR
, ssh
->cfg
.termtype
,
4392 PKT_INT
, ssh
->term_height
,
4393 PKT_INT
, ssh
->term_width
,
4394 PKT_INT
, 0, PKT_INT
, 0, /* width,height in pixels */
4395 PKT_CHAR
, 192, PKT_INT
, ssh
->ispeed
, /* TTY_OP_ISPEED */
4396 PKT_CHAR
, 193, PKT_INT
, ssh
->ospeed
, /* TTY_OP_OSPEED */
4397 PKT_CHAR
, 0, PKT_END
);
4398 ssh
->state
= SSH_STATE_INTERMED
;
4402 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4403 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4404 bombout(("Protocol confusion"));
4406 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4407 c_write_str(ssh
, "Server refused to allocate pty\r\n");
4408 ssh
->editing
= ssh
->echoing
= 1;
4410 logeventf(ssh
, "Allocated pty (ospeed %dbps, ispeed %dbps)",
4411 ssh
->ospeed
, ssh
->ispeed
);
4413 ssh
->editing
= ssh
->echoing
= 1;
4416 if (ssh
->cfg
.compression
) {
4417 send_packet(ssh
, SSH1_CMSG_REQUEST_COMPRESSION
, PKT_INT
, 6, PKT_END
);
4421 if (pktin
->type
!= SSH1_SMSG_SUCCESS
4422 && pktin
->type
!= SSH1_SMSG_FAILURE
) {
4423 bombout(("Protocol confusion"));
4425 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4426 c_write_str(ssh
, "Server refused to compress\r\n");
4428 logevent("Started compression");
4429 ssh
->v1_compressing
= TRUE
;
4430 ssh
->cs_comp_ctx
= zlib_compress_init();
4431 logevent("Initialised zlib (RFC1950) compression");
4432 ssh
->sc_comp_ctx
= zlib_decompress_init();
4433 logevent("Initialised zlib (RFC1950) decompression");
4437 * Start the shell or command.
4439 * Special case: if the first-choice command is an SSH2
4440 * subsystem (hence not usable here) and the second choice
4441 * exists, we fall straight back to that.
4444 char *cmd
= ssh
->cfg
.remote_cmd_ptr
;
4446 if (ssh
->cfg
.ssh_subsys
&& ssh
->cfg
.remote_cmd_ptr2
) {
4447 cmd
= ssh
->cfg
.remote_cmd_ptr2
;
4448 ssh
->fallback_cmd
= TRUE
;
4451 send_packet(ssh
, SSH1_CMSG_EXEC_CMD
, PKT_STR
, cmd
, PKT_END
);
4453 send_packet(ssh
, SSH1_CMSG_EXEC_SHELL
, PKT_END
);
4454 logevent("Started session");
4457 ssh
->state
= SSH_STATE_SESSION
;
4458 if (ssh
->size_needed
)
4459 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
4460 if (ssh
->eof_needed
)
4461 ssh_special(ssh
, TS_EOF
);
4464 ldisc_send(ssh
->ldisc
, NULL
, 0, 0);/* cause ldisc to notice changes */
4466 ssh
->channels
= newtree234(ssh_channelcmp
);
4470 * By this point, most incoming packets are already being
4471 * handled by the dispatch table, and we need only pay
4472 * attention to the unusual ones.
4477 if (pktin
->type
== SSH1_SMSG_SUCCESS
) {
4478 /* may be from EXEC_SHELL on some servers */
4479 } else if (pktin
->type
== SSH1_SMSG_FAILURE
) {
4480 /* may be from EXEC_SHELL on some servers
4481 * if no pty is available or in other odd cases. Ignore */
4483 bombout(("Strange packet received: type %d", pktin
->type
));
4488 int len
= min(inlen
, 512);
4489 send_packet(ssh
, SSH1_CMSG_STDIN_DATA
, PKTT_DATA
,
4490 PKT_INT
, len
, PKT_DATA
, in
, len
,
4491 PKTT_OTHER
, PKT_END
);
4502 * Handle the top-level SSH2 protocol.
4504 static void ssh1_msg_debug(Ssh ssh
, struct Packet
*pktin
)
4509 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
4510 buf
= dupprintf("Remote debug message: %.*s", msglen
, msg
);
4515 static void ssh1_msg_disconnect(Ssh ssh
, struct Packet
*pktin
)
4517 /* log reason code in disconnect message */
4521 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
4522 bombout(("Server sent disconnect message:\n\"%.*s\"", msglen
, msg
));
4525 void ssh_msg_ignore(Ssh ssh
, struct Packet
*pktin
)
4527 /* Do nothing, because we're ignoring it! Duhh. */
4530 static void ssh1_protocol_setup(Ssh ssh
)
4535 * Most messages are handled by the coroutines.
4537 for (i
= 0; i
< 256; i
++)
4538 ssh
->packet_dispatch
[i
] = NULL
;
4541 * These special message types we install handlers for.
4543 ssh
->packet_dispatch
[SSH1_MSG_DISCONNECT
] = ssh1_msg_disconnect
;
4544 ssh
->packet_dispatch
[SSH1_MSG_IGNORE
] = ssh_msg_ignore
;
4545 ssh
->packet_dispatch
[SSH1_MSG_DEBUG
] = ssh1_msg_debug
;
4548 static void ssh1_protocol(Ssh ssh
, unsigned char *in
, int inlen
,
4549 struct Packet
*pktin
)
4551 if (ssh
->state
== SSH_STATE_CLOSED
)
4554 if (pktin
&& ssh
->packet_dispatch
[pktin
->type
]) {
4555 ssh
->packet_dispatch
[pktin
->type
](ssh
, pktin
);
4559 if (!ssh
->protocol_initial_phase_done
) {
4560 if (do_ssh1_login(ssh
, in
, inlen
, pktin
))
4561 ssh
->protocol_initial_phase_done
= TRUE
;
4566 do_ssh1_connection(ssh
, in
, inlen
, pktin
);
4570 * Utility routine for decoding comma-separated strings in KEXINIT.
4572 static int in_commasep_string(char *needle
, char *haystack
, int haylen
)
4575 if (!needle
|| !haystack
) /* protect against null pointers */
4577 needlen
= strlen(needle
);
4580 * Is it at the start of the string?
4582 if (haylen
>= needlen
&& /* haystack is long enough */
4583 !memcmp(needle
, haystack
, needlen
) && /* initial match */
4584 (haylen
== needlen
|| haystack
[needlen
] == ',')
4585 /* either , or EOS follows */
4589 * If not, search for the next comma and resume after that.
4590 * If no comma found, terminate.
4592 while (haylen
> 0 && *haystack
!= ',')
4593 haylen
--, haystack
++;
4596 haylen
--, haystack
++; /* skip over comma itself */
4601 * SSH2 key creation method.
4603 static void ssh2_mkkey(Ssh ssh
, Bignum K
, unsigned char *H
,
4604 unsigned char *sessid
, char chr
,
4605 unsigned char *keyspace
)
4608 /* First 20 bytes. */
4610 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
4612 SHA_Bytes(&s
, H
, 20);
4613 SHA_Bytes(&s
, &chr
, 1);
4614 SHA_Bytes(&s
, sessid
, 20);
4615 SHA_Final(&s
, keyspace
);
4616 /* Next 20 bytes. */
4618 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
4620 SHA_Bytes(&s
, H
, 20);
4621 SHA_Bytes(&s
, keyspace
, 20);
4622 SHA_Final(&s
, keyspace
+ 20);
4626 * Handle the SSH2 transport layer.
4628 static int do_ssh2_transport(Ssh ssh
, unsigned char *in
, int inlen
,
4629 struct Packet
*pktin
)
4631 struct do_ssh2_transport_state
{
4632 int nbits
, pbits
, warn
;
4633 Bignum p
, g
, e
, f
, K
;
4634 int kex_init_value
, kex_reply_value
;
4635 const struct ssh_mac
**maclist
;
4637 const struct ssh2_cipher
*cscipher_tobe
;
4638 const struct ssh2_cipher
*sccipher_tobe
;
4639 const struct ssh_mac
*csmac_tobe
;
4640 const struct ssh_mac
*scmac_tobe
;
4641 const struct ssh_compress
*cscomp_tobe
;
4642 const struct ssh_compress
*sccomp_tobe
;
4643 char *hostkeydata
, *sigdata
, *keystr
, *fingerprint
;
4644 int hostkeylen
, siglen
;
4645 void *hkey
; /* actual host key */
4646 unsigned char exchange_hash
[20];
4647 int n_preferred_kex
;
4648 const struct ssh_kex
*preferred_kex
[KEX_MAX
];
4649 int n_preferred_ciphers
;
4650 const struct ssh2_ciphers
*preferred_ciphers
[CIPHER_MAX
];
4651 const struct ssh_compress
*preferred_comp
;
4653 struct Packet
*pktout
;
4655 crState(do_ssh2_transport_state
);
4657 crBegin(ssh
->do_ssh2_transport_crstate
);
4659 s
->cscipher_tobe
= s
->sccipher_tobe
= NULL
;
4660 s
->csmac_tobe
= s
->scmac_tobe
= NULL
;
4661 s
->cscomp_tobe
= s
->sccomp_tobe
= NULL
;
4668 * Set up the preferred key exchange. (NULL => warn below here)
4670 s
->n_preferred_kex
= 0;
4671 for (i
= 0; i
< KEX_MAX
; i
++) {
4672 switch (ssh
->cfg
.ssh_kexlist
[i
]) {
4674 s
->preferred_kex
[s
->n_preferred_kex
++] =
4675 &ssh_diffiehellman_gex
;
4678 s
->preferred_kex
[s
->n_preferred_kex
++] =
4679 &ssh_diffiehellman_group14
;
4682 s
->preferred_kex
[s
->n_preferred_kex
++] =
4683 &ssh_diffiehellman_group1
;
4686 /* Flag for later. Don't bother if it's the last in
4688 if (i
< KEX_MAX
- 1) {
4689 s
->preferred_kex
[s
->n_preferred_kex
++] = NULL
;
4699 * Set up the preferred ciphers. (NULL => warn below here)
4701 s
->n_preferred_ciphers
= 0;
4702 for (i
= 0; i
< CIPHER_MAX
; i
++) {
4703 switch (ssh
->cfg
.ssh_cipherlist
[i
]) {
4704 case CIPHER_BLOWFISH
:
4705 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_blowfish
;
4708 if (ssh
->cfg
.ssh2_des_cbc
) {
4709 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_des
;
4713 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_3des
;
4716 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_aes
;
4719 /* Flag for later. Don't bother if it's the last in
4721 if (i
< CIPHER_MAX
- 1) {
4722 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = NULL
;
4730 * Set up preferred compression.
4732 if (ssh
->cfg
.compression
)
4733 s
->preferred_comp
= &ssh_zlib
;
4735 s
->preferred_comp
= &ssh_comp_none
;
4738 * Be prepared to work around the buggy MAC problem.
4740 if (ssh
->remote_bugs
& BUG_SSH2_HMAC
)
4741 s
->maclist
= buggymacs
, s
->nmacs
= lenof(buggymacs
);
4743 s
->maclist
= macs
, s
->nmacs
= lenof(macs
);
4747 int i
, j
, commalist_started
;
4750 * Enable queueing of outgoing auth- or connection-layer
4751 * packets while we are in the middle of a key exchange.
4753 ssh
->queueing
= TRUE
;
4756 * Flag that KEX is in progress.
4758 ssh
->kex_in_progress
= TRUE
;
4761 * Construct and send our key exchange packet.
4763 s
->pktout
= ssh2_pkt_init(SSH2_MSG_KEXINIT
);
4764 for (i
= 0; i
< 16; i
++)
4765 ssh2_pkt_addbyte(s
->pktout
, (unsigned char) random_byte());
4766 /* List key exchange algorithms. */
4767 ssh2_pkt_addstring_start(s
->pktout
);
4768 commalist_started
= 0;
4769 for (i
= 0; i
< s
->n_preferred_kex
; i
++) {
4770 const struct ssh_kex
*k
= s
->preferred_kex
[i
];
4771 if (!k
) continue; /* warning flag */
4772 if (commalist_started
)
4773 ssh2_pkt_addstring_str(s
->pktout
, ",");
4774 ssh2_pkt_addstring_str(s
->pktout
, s
->preferred_kex
[i
]->name
);
4775 commalist_started
= 1;
4777 /* List server host key algorithms. */
4778 ssh2_pkt_addstring_start(s
->pktout
);
4779 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
4780 ssh2_pkt_addstring_str(s
->pktout
, hostkey_algs
[i
]->name
);
4781 if (i
< lenof(hostkey_algs
) - 1)
4782 ssh2_pkt_addstring_str(s
->pktout
, ",");
4784 /* List client->server encryption algorithms. */
4785 ssh2_pkt_addstring_start(s
->pktout
);
4786 commalist_started
= 0;
4787 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4788 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4789 if (!c
) continue; /* warning flag */
4790 for (j
= 0; j
< c
->nciphers
; j
++) {
4791 if (commalist_started
)
4792 ssh2_pkt_addstring_str(s
->pktout
, ",");
4793 ssh2_pkt_addstring_str(s
->pktout
, c
->list
[j
]->name
);
4794 commalist_started
= 1;
4797 /* List server->client encryption algorithms. */
4798 ssh2_pkt_addstring_start(s
->pktout
);
4799 commalist_started
= 0;
4800 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4801 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4802 if (!c
) continue; /* warning flag */
4803 for (j
= 0; j
< c
->nciphers
; j
++) {
4804 if (commalist_started
)
4805 ssh2_pkt_addstring_str(s
->pktout
, ",");
4806 ssh2_pkt_addstring_str(s
->pktout
, c
->list
[j
]->name
);
4807 commalist_started
= 1;
4810 /* List client->server MAC algorithms. */
4811 ssh2_pkt_addstring_start(s
->pktout
);
4812 for (i
= 0; i
< s
->nmacs
; i
++) {
4813 ssh2_pkt_addstring_str(s
->pktout
, s
->maclist
[i
]->name
);
4814 if (i
< s
->nmacs
- 1)
4815 ssh2_pkt_addstring_str(s
->pktout
, ",");
4817 /* List server->client MAC algorithms. */
4818 ssh2_pkt_addstring_start(s
->pktout
);
4819 for (i
= 0; i
< s
->nmacs
; i
++) {
4820 ssh2_pkt_addstring_str(s
->pktout
, s
->maclist
[i
]->name
);
4821 if (i
< s
->nmacs
- 1)
4822 ssh2_pkt_addstring_str(s
->pktout
, ",");
4824 /* List client->server compression algorithms. */
4825 ssh2_pkt_addstring_start(s
->pktout
);
4826 assert(lenof(compressions
) > 1);
4827 ssh2_pkt_addstring_str(s
->pktout
, s
->preferred_comp
->name
);
4828 for (i
= 0; i
< lenof(compressions
); i
++) {
4829 const struct ssh_compress
*c
= compressions
[i
];
4830 if (c
!= s
->preferred_comp
) {
4831 ssh2_pkt_addstring_str(s
->pktout
, ",");
4832 ssh2_pkt_addstring_str(s
->pktout
, c
->name
);
4835 /* List server->client compression algorithms. */
4836 ssh2_pkt_addstring_start(s
->pktout
);
4837 assert(lenof(compressions
) > 1);
4838 ssh2_pkt_addstring_str(s
->pktout
, s
->preferred_comp
->name
);
4839 for (i
= 0; i
< lenof(compressions
); i
++) {
4840 const struct ssh_compress
*c
= compressions
[i
];
4841 if (c
!= s
->preferred_comp
) {
4842 ssh2_pkt_addstring_str(s
->pktout
, ",");
4843 ssh2_pkt_addstring_str(s
->pktout
, c
->name
);
4846 /* List client->server languages. Empty list. */
4847 ssh2_pkt_addstring_start(s
->pktout
);
4848 /* List server->client languages. Empty list. */
4849 ssh2_pkt_addstring_start(s
->pktout
);
4850 /* First KEX packet does _not_ follow, because we're not that brave. */
4851 ssh2_pkt_addbool(s
->pktout
, FALSE
);
4853 ssh2_pkt_adduint32(s
->pktout
, 0);
4856 ssh
->exhash
= ssh
->exhashbase
;
4857 sha_string(&ssh
->exhash
, s
->pktout
->data
+ 5, s
->pktout
->length
- 5);
4859 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
4863 if (pktin
->length
> 5)
4864 sha_string(&ssh
->exhash
, pktin
->data
+ 5, pktin
->length
- 5);
4867 * Now examine the other side's KEXINIT to see what we're up
4874 if (pktin
->type
!= SSH2_MSG_KEXINIT
) {
4875 bombout(("expected key exchange packet from server"));
4879 ssh
->hostkey
= NULL
;
4880 s
->cscipher_tobe
= NULL
;
4881 s
->sccipher_tobe
= NULL
;
4882 s
->csmac_tobe
= NULL
;
4883 s
->scmac_tobe
= NULL
;
4884 s
->cscomp_tobe
= NULL
;
4885 s
->sccomp_tobe
= NULL
;
4886 pktin
->savedpos
+= 16; /* skip garbage cookie */
4887 ssh_pkt_getstring(pktin
, &str
, &len
); /* key exchange algorithms */
4889 for (i
= 0; i
< s
->n_preferred_kex
; i
++) {
4890 const struct ssh_kex
*k
= s
->preferred_kex
[i
];
4893 } else if (in_commasep_string(k
->name
, str
, len
)) {
4898 askalg(ssh
->frontend
, "key-exchange algorithm",
4904 bombout(("Couldn't agree a key exchange algorithm (available: %s)",
4905 str ? str
: "(null)"));
4908 ssh_pkt_getstring(pktin
, &str
, &len
); /* host key algorithms */
4909 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
4910 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
4911 ssh
->hostkey
= hostkey_algs
[i
];
4915 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server cipher */
4917 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4918 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4922 for (j
= 0; j
< c
->nciphers
; j
++) {
4923 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
4924 s
->cscipher_tobe
= c
->list
[j
];
4929 if (s
->cscipher_tobe
) {
4931 askalg(ssh
->frontend
, "client-to-server cipher",
4932 s
->cscipher_tobe
->name
);
4936 if (!s
->cscipher_tobe
) {
4937 bombout(("Couldn't agree a client-to-server cipher (available: %s)",
4938 str ? str
: "(null)"));
4942 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client cipher */
4944 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
4945 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
4949 for (j
= 0; j
< c
->nciphers
; j
++) {
4950 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
4951 s
->sccipher_tobe
= c
->list
[j
];
4956 if (s
->sccipher_tobe
) {
4958 askalg(ssh
->frontend
, "server-to-client cipher",
4959 s
->sccipher_tobe
->name
);
4963 if (!s
->sccipher_tobe
) {
4964 bombout(("Couldn't agree a server-to-client cipher (available: %s)",
4965 str ? str
: "(null)"));
4969 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server mac */
4970 for (i
= 0; i
< s
->nmacs
; i
++) {
4971 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
4972 s
->csmac_tobe
= s
->maclist
[i
];
4976 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client mac */
4977 for (i
= 0; i
< s
->nmacs
; i
++) {
4978 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
4979 s
->scmac_tobe
= s
->maclist
[i
];
4983 ssh_pkt_getstring(pktin
, &str
, &len
); /* client->server compression */
4984 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
4985 const struct ssh_compress
*c
=
4986 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
4987 if (in_commasep_string(c
->name
, str
, len
)) {
4992 ssh_pkt_getstring(pktin
, &str
, &len
); /* server->client compression */
4993 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
4994 const struct ssh_compress
*c
=
4995 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
4996 if (in_commasep_string(c
->name
, str
, len
)) {
5004 * Work out the number of bits of key we will need from the key
5005 * exchange. We start with the maximum key length of either
5011 csbits
= s
->cscipher_tobe
->keylen
;
5012 scbits
= s
->sccipher_tobe
->keylen
;
5013 s
->nbits
= (csbits
> scbits ? csbits
: scbits
);
5015 /* The keys only have 160-bit entropy, since they're based on
5016 * a SHA-1 hash. So cap the key size at 160 bits. */
5021 * If we're doing Diffie-Hellman group exchange, start by
5022 * requesting a group.
5024 if (!ssh
->kex
->pdata
) {
5025 logevent("Doing Diffie-Hellman group exchange");
5026 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGEX
;
5028 * Work out how big a DH group we will need to allow that
5031 s
->pbits
= 512 << ((s
->nbits
- 1) / 64);
5032 s
->pktout
= ssh2_pkt_init(SSH2_MSG_KEX_DH_GEX_REQUEST
);
5033 ssh2_pkt_adduint32(s
->pktout
, s
->pbits
);
5034 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5037 if (pktin
->type
!= SSH2_MSG_KEX_DH_GEX_GROUP
) {
5038 bombout(("expected key exchange group packet from server"));
5041 s
->p
= ssh2_pkt_getmp(pktin
);
5042 s
->g
= ssh2_pkt_getmp(pktin
);
5043 if (!s
->p
|| !s
->g
) {
5044 bombout(("unable to read mp-ints from incoming group packet"));
5047 ssh
->kex_ctx
= dh_setup_gex(s
->p
, s
->g
);
5048 s
->kex_init_value
= SSH2_MSG_KEX_DH_GEX_INIT
;
5049 s
->kex_reply_value
= SSH2_MSG_KEX_DH_GEX_REPLY
;
5051 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGROUP
;
5052 ssh
->kex_ctx
= dh_setup_group(ssh
->kex
);
5053 s
->kex_init_value
= SSH2_MSG_KEXDH_INIT
;
5054 s
->kex_reply_value
= SSH2_MSG_KEXDH_REPLY
;
5055 logeventf(ssh
, "Using Diffie-Hellman with standard group \"%s\"",
5056 ssh
->kex
->groupname
);
5059 logevent("Doing Diffie-Hellman key exchange");
5061 * Now generate and send e for Diffie-Hellman.
5063 s
->e
= dh_create_e(ssh
->kex_ctx
, s
->nbits
* 2);
5064 s
->pktout
= ssh2_pkt_init(s
->kex_init_value
);
5065 ssh2_pkt_addmp(s
->pktout
, s
->e
);
5066 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5069 if (pktin
->type
!= s
->kex_reply_value
) {
5070 bombout(("expected key exchange reply packet from server"));
5073 ssh_pkt_getstring(pktin
, &s
->hostkeydata
, &s
->hostkeylen
);
5074 s
->f
= ssh2_pkt_getmp(pktin
);
5076 bombout(("unable to parse key exchange reply packet"));
5079 ssh_pkt_getstring(pktin
, &s
->sigdata
, &s
->siglen
);
5081 s
->K
= dh_find_K(ssh
->kex_ctx
, s
->f
);
5083 sha_string(&ssh
->exhash
, s
->hostkeydata
, s
->hostkeylen
);
5084 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
5085 sha_uint32(&ssh
->exhash
, s
->pbits
);
5086 sha_mpint(&ssh
->exhash
, s
->p
);
5087 sha_mpint(&ssh
->exhash
, s
->g
);
5089 sha_mpint(&ssh
->exhash
, s
->e
);
5090 sha_mpint(&ssh
->exhash
, s
->f
);
5091 sha_mpint(&ssh
->exhash
, s
->K
);
5092 SHA_Final(&ssh
->exhash
, s
->exchange_hash
);
5094 dh_cleanup(ssh
->kex_ctx
);
5095 ssh
->kex_ctx
= NULL
;
5098 debug(("Exchange hash is:\n"));
5099 dmemdump(s
->exchange_hash
, 20);
5102 s
->hkey
= ssh
->hostkey
->newkey(s
->hostkeydata
, s
->hostkeylen
);
5104 !ssh
->hostkey
->verifysig(s
->hkey
, s
->sigdata
, s
->siglen
,
5105 (char *)s
->exchange_hash
, 20)) {
5106 bombout(("Server's host key did not match the signature supplied"));
5111 * Authenticate remote host: verify host key. (We've already
5112 * checked the signature of the exchange hash.)
5114 s
->keystr
= ssh
->hostkey
->fmtkey(s
->hkey
);
5115 s
->fingerprint
= ssh
->hostkey
->fingerprint(s
->hkey
);
5116 verify_ssh_host_key(ssh
->frontend
,
5117 ssh
->savedhost
, ssh
->savedport
, ssh
->hostkey
->keytype
,
5118 s
->keystr
, s
->fingerprint
);
5119 if (s
->first_kex
) { /* don't bother logging this in rekeys */
5120 logevent("Host key fingerprint is:");
5121 logevent(s
->fingerprint
);
5123 sfree(s
->fingerprint
);
5125 ssh
->hostkey
->freekey(s
->hkey
);
5128 * The exchange hash from the very first key exchange is also
5129 * the session id, used in session key construction and
5133 memcpy(ssh
->v2_session_id
, s
->exchange_hash
,
5134 sizeof(s
->exchange_hash
));
5137 * Send SSH2_MSG_NEWKEYS.
5139 s
->pktout
= ssh2_pkt_init(SSH2_MSG_NEWKEYS
);
5140 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5141 ssh
->outgoing_data_size
= 0; /* start counting from here */
5144 * We've sent client NEWKEYS, so create and initialise
5145 * client-to-server session keys.
5147 if (ssh
->cs_cipher_ctx
)
5148 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
5149 ssh
->cscipher
= s
->cscipher_tobe
;
5150 ssh
->cs_cipher_ctx
= ssh
->cscipher
->make_context();
5152 if (ssh
->cs_mac_ctx
)
5153 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
5154 ssh
->csmac
= s
->csmac_tobe
;
5155 ssh
->cs_mac_ctx
= ssh
->csmac
->make_context();
5157 if (ssh
->cs_comp_ctx
)
5158 ssh
->cscomp
->compress_cleanup(ssh
->cs_comp_ctx
);
5159 ssh
->cscomp
= s
->cscomp_tobe
;
5160 ssh
->cs_comp_ctx
= ssh
->cscomp
->compress_init();
5163 * Set IVs on client-to-server keys. Here we use the exchange
5164 * hash from the _first_ key exchange.
5167 unsigned char keyspace
[40];
5168 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'C',keyspace
);
5169 ssh
->cscipher
->setkey(ssh
->cs_cipher_ctx
, keyspace
);
5170 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'A',keyspace
);
5171 ssh
->cscipher
->setiv(ssh
->cs_cipher_ctx
, keyspace
);
5172 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'E',keyspace
);
5173 ssh
->csmac
->setkey(ssh
->cs_mac_ctx
, keyspace
);
5176 logeventf(ssh
, "Initialised %.200s client->server encryption",
5177 ssh
->cscipher
->text_name
);
5178 logeventf(ssh
, "Initialised %.200s client->server MAC algorithm",
5179 ssh
->csmac
->text_name
);
5180 if (ssh
->cscomp
->text_name
)
5181 logeventf(ssh
, "Initialised %s compression",
5182 ssh
->cscomp
->text_name
);
5185 * Now our end of the key exchange is complete, we can send all
5186 * our queued higher-layer packets.
5188 ssh
->queueing
= FALSE
;
5189 ssh2_pkt_queuesend(ssh
);
5192 * Expect SSH2_MSG_NEWKEYS from server.
5195 if (pktin
->type
!= SSH2_MSG_NEWKEYS
) {
5196 bombout(("expected new-keys packet from server"));
5199 ssh
->incoming_data_size
= 0; /* start counting from here */
5202 * We've seen server NEWKEYS, so create and initialise
5203 * server-to-client session keys.
5205 if (ssh
->sc_cipher_ctx
)
5206 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
5207 ssh
->sccipher
= s
->sccipher_tobe
;
5208 ssh
->sc_cipher_ctx
= ssh
->sccipher
->make_context();
5210 if (ssh
->sc_mac_ctx
)
5211 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
5212 ssh
->scmac
= s
->scmac_tobe
;
5213 ssh
->sc_mac_ctx
= ssh
->scmac
->make_context();
5215 if (ssh
->sc_comp_ctx
)
5216 ssh
->sccomp
->decompress_cleanup(ssh
->sc_comp_ctx
);
5217 ssh
->sccomp
= s
->sccomp_tobe
;
5218 ssh
->sc_comp_ctx
= ssh
->sccomp
->decompress_init();
5221 * Set IVs on server-to-client keys. Here we use the exchange
5222 * hash from the _first_ key exchange.
5225 unsigned char keyspace
[40];
5226 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'D',keyspace
);
5227 ssh
->sccipher
->setkey(ssh
->sc_cipher_ctx
, keyspace
);
5228 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'B',keyspace
);
5229 ssh
->sccipher
->setiv(ssh
->sc_cipher_ctx
, keyspace
);
5230 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'F',keyspace
);
5231 ssh
->scmac
->setkey(ssh
->sc_mac_ctx
, keyspace
);
5233 logeventf(ssh
, "Initialised %.200s server->client encryption",
5234 ssh
->sccipher
->text_name
);
5235 logeventf(ssh
, "Initialised %.200s server->client MAC algorithm",
5236 ssh
->scmac
->text_name
);
5237 if (ssh
->sccomp
->text_name
)
5238 logeventf(ssh
, "Initialised %s decompression",
5239 ssh
->sccomp
->text_name
);
5242 * Free key exchange data.
5246 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
5252 * Key exchange is over. Schedule a timer for our next rekey.
5254 ssh
->kex_in_progress
= FALSE
;
5255 ssh
->last_rekey
= GETTICKCOUNT();
5256 if (ssh
->cfg
.ssh_rekey_time
!= 0)
5257 ssh
->next_rekey
= schedule_timer(ssh
->cfg
.ssh_rekey_time
*60*TICKSPERSEC
,
5261 * If this is the first key exchange phase, we must pass the
5262 * SSH2_MSG_NEWKEYS packet to the next layer, not because it
5263 * wants to see it but because it will need time to initialise
5264 * itself before it sees an actual packet. In subsequent key
5265 * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because
5266 * it would only confuse the layer above.
5268 if (!s
->first_kex
) {
5274 * Now we're encrypting. Begin returning 1 to the protocol main
5275 * function so that other things can run on top of the
5276 * transport. If we ever see a KEXINIT, we must go back to the
5279 * We _also_ go back to the start if we see pktin==NULL and
5280 * inlen==-1, because this is a special signal meaning
5281 * `initiate client-driven rekey', and `in' contains a message
5282 * giving the reason for the rekey.
5284 while (!((pktin
&& pktin
->type
== SSH2_MSG_KEXINIT
) ||
5285 (!pktin
&& inlen
== -1))) {
5289 logevent("Server initiated key re-exchange");
5291 logevent((char *)in
);
5293 goto begin_key_exchange
;
5299 * Add data to an SSH2 channel output buffer.
5301 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
,
5304 bufchain_add(&c
->v
.v2
.outbuffer
, buf
, len
);
5308 * Attempt to send data on an SSH2 channel.
5310 static int ssh2_try_send(struct ssh_channel
*c
)
5313 struct Packet
*pktout
;
5315 while (c
->v
.v2
.remwindow
> 0 && bufchain_size(&c
->v
.v2
.outbuffer
) > 0) {
5318 bufchain_prefix(&c
->v
.v2
.outbuffer
, &data
, &len
);
5319 if ((unsigned)len
> c
->v
.v2
.remwindow
)
5320 len
= c
->v
.v2
.remwindow
;
5321 if ((unsigned)len
> c
->v
.v2
.remmaxpkt
)
5322 len
= c
->v
.v2
.remmaxpkt
;
5323 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA
);
5324 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5325 dont_log_data(ssh
, pktout
, PKTLOG_OMIT
);
5326 ssh2_pkt_addstring_start(pktout
);
5327 ssh2_pkt_addstring_data(pktout
, data
, len
);
5328 end_log_omission(ssh
, pktout
);
5329 ssh2_pkt_send(ssh
, pktout
);
5330 bufchain_consume(&c
->v
.v2
.outbuffer
, len
);
5331 c
->v
.v2
.remwindow
-= len
;
5335 * After having sent as much data as we can, return the amount
5338 return bufchain_size(&c
->v
.v2
.outbuffer
);
5342 * Potentially enlarge the window on an SSH2 channel.
5344 static void ssh2_set_window(struct ssh_channel
*c
, unsigned newwin
)
5349 * Never send WINDOW_ADJUST for a channel that the remote side
5350 * already thinks it's closed; there's no point, since it won't
5351 * be sending any more data anyway.
5356 if (newwin
> c
->v
.v2
.locwindow
) {
5357 struct Packet
*pktout
;
5359 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5360 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5361 ssh2_pkt_adduint32(pktout
, newwin
- c
->v
.v2
.locwindow
);
5362 ssh2_pkt_send(ssh
, pktout
);
5363 c
->v
.v2
.locwindow
= newwin
;
5367 static void ssh2_msg_channel_window_adjust(Ssh ssh
, struct Packet
*pktin
)
5369 unsigned i
= ssh_pkt_getuint32(pktin
);
5370 struct ssh_channel
*c
;
5371 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5372 if (c
&& !c
->closes
)
5373 c
->v
.v2
.remwindow
+= ssh_pkt_getuint32(pktin
);
5376 static void ssh2_msg_channel_data(Ssh ssh
, struct Packet
*pktin
)
5379 unsigned int length
;
5380 unsigned i
= ssh_pkt_getuint32(pktin
);
5381 struct ssh_channel
*c
;
5382 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5384 return; /* nonexistent channel */
5385 if (pktin
->type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
&&
5386 ssh_pkt_getuint32(pktin
) != SSH2_EXTENDED_DATA_STDERR
)
5387 return; /* extended but not stderr */
5388 ssh_pkt_getstring(pktin
, &data
, &length
);
5391 c
->v
.v2
.locwindow
-= length
;
5393 case CHAN_MAINSESSION
:
5395 from_backend(ssh
->frontend
, pktin
->type
==
5396 SSH2_MSG_CHANNEL_EXTENDED_DATA
,
5400 bufsize
= x11_send(c
->u
.x11
.s
, data
, length
);
5403 bufsize
= pfd_send(c
->u
.pfd
.s
, data
, length
);
5406 while (length
> 0) {
5407 if (c
->u
.a
.lensofar
< 4) {
5408 unsigned int l
= min(4 - c
->u
.a
.lensofar
, length
);
5409 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
,
5413 c
->u
.a
.lensofar
+= l
;
5415 if (c
->u
.a
.lensofar
== 4) {
5417 4 + GET_32BIT(c
->u
.a
.msglen
);
5418 c
->u
.a
.message
= snewn(c
->u
.a
.totallen
,
5420 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
5422 if (c
->u
.a
.lensofar
>= 4 && length
> 0) {
5424 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
5426 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
,
5430 c
->u
.a
.lensofar
+= l
;
5432 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
5435 if (agent_query(c
->u
.a
.message
,
5438 ssh_agentf_callback
, c
))
5439 ssh_agentf_callback(c
, reply
, replylen
);
5440 sfree(c
->u
.a
.message
);
5441 c
->u
.a
.lensofar
= 0;
5448 * If we are not buffering too much data,
5449 * enlarge the window again at the remote side.
5451 if (bufsize
< OUR_V2_WINSIZE
)
5452 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
5456 static void ssh2_msg_channel_eof(Ssh ssh
, struct Packet
*pktin
)
5458 unsigned i
= ssh_pkt_getuint32(pktin
);
5459 struct ssh_channel
*c
;
5461 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5463 return; /* nonexistent channel */
5465 if (c
->type
== CHAN_X11
) {
5467 * Remote EOF on an X11 channel means we should
5468 * wrap up and close the channel ourselves.
5470 x11_close(c
->u
.x11
.s
);
5472 } else if (c
->type
== CHAN_AGENT
) {
5474 } else if (c
->type
== CHAN_SOCKDATA
) {
5475 pfd_close(c
->u
.pfd
.s
);
5480 static void ssh2_msg_channel_close(Ssh ssh
, struct Packet
*pktin
)
5482 unsigned i
= ssh_pkt_getuint32(pktin
);
5483 struct ssh_channel
*c
;
5484 struct Packet
*pktout
;
5486 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5487 if (!c
|| ((int)c
->remoteid
) == -1) {
5488 bombout(("Received CHANNEL_CLOSE for %s channel %d\n",
5489 c ?
"half-open" : "nonexistent", i
));
5492 /* Do pre-close processing on the channel. */
5494 case CHAN_MAINSESSION
:
5495 ssh
->mainchan
= NULL
;
5496 update_specials_menu(ssh
->frontend
);
5499 if (c
->u
.x11
.s
!= NULL
)
5500 x11_close(c
->u
.x11
.s
);
5507 if (c
->u
.pfd
.s
!= NULL
)
5508 pfd_close(c
->u
.pfd
.s
);
5512 if (c
->closes
== 0) {
5513 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
5514 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5515 ssh2_pkt_send(ssh
, pktout
);
5517 del234(ssh
->channels
, c
);
5518 bufchain_clear(&c
->v
.v2
.outbuffer
);
5522 * See if that was the last channel left open.
5523 * (This is only our termination condition if we're
5524 * not running in -N mode.)
5526 if (!ssh
->cfg
.ssh_no_shell
&& count234(ssh
->channels
) == 0) {
5527 logevent("All channels closed. Disconnecting");
5530 * We used to send SSH_MSG_DISCONNECT here,
5531 * because I'd believed that _every_ conforming
5532 * SSH2 connection had to end with a disconnect
5533 * being sent by at least one side; apparently
5534 * I was wrong and it's perfectly OK to
5535 * unceremoniously slam the connection shut
5536 * when you're done, and indeed OpenSSH feels
5537 * this is more polite than sending a
5538 * DISCONNECT. So now we don't.
5540 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
5541 ssh2_pkt_adduint32(s
->pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
5542 ssh2_pkt_addstring(s
->pktout
, "All open channels closed");
5543 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
5544 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
5546 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5550 static void ssh2_msg_channel_open_confirmation(Ssh ssh
, struct Packet
*pktin
)
5552 unsigned i
= ssh_pkt_getuint32(pktin
);
5553 struct ssh_channel
*c
;
5554 struct Packet
*pktout
;
5556 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5558 return; /* nonexistent channel */
5559 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
5560 return; /* dunno why they're confirming this */
5561 c
->remoteid
= ssh_pkt_getuint32(pktin
);
5562 c
->type
= CHAN_SOCKDATA
;
5563 c
->v
.v2
.remwindow
= ssh_pkt_getuint32(pktin
);
5564 c
->v
.v2
.remmaxpkt
= ssh_pkt_getuint32(pktin
);
5566 pfd_confirm(c
->u
.pfd
.s
);
5569 * We have a pending close on this channel,
5570 * which we decided on before the server acked
5571 * the channel open. So now we know the
5572 * remoteid, we can close it again.
5574 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
5575 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5576 ssh2_pkt_send(ssh
, pktout
);
5580 static void ssh2_msg_channel_open_failure(Ssh ssh
, struct Packet
*pktin
)
5582 static const char *const reasons
[] = {
5583 "<unknown reason code>",
5584 "Administratively prohibited",
5586 "Unknown channel type",
5587 "Resource shortage",
5589 unsigned i
= ssh_pkt_getuint32(pktin
);
5590 unsigned reason_code
;
5591 char *reason_string
;
5594 struct ssh_channel
*c
;
5595 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5597 return; /* nonexistent channel */
5598 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
5599 return; /* dunno why they're failing this */
5601 reason_code
= ssh_pkt_getuint32(pktin
);
5602 if (reason_code
>= lenof(reasons
))
5603 reason_code
= 0; /* ensure reasons[reason_code] in range */
5604 ssh_pkt_getstring(pktin
, &reason_string
, &reason_length
);
5605 message
= dupprintf("Forwarded connection refused by"
5606 " server: %s [%.*s]", reasons
[reason_code
],
5607 reason_length
, reason_string
);
5611 pfd_close(c
->u
.pfd
.s
);
5613 del234(ssh
->channels
, c
);
5617 static void ssh2_msg_channel_request(Ssh ssh
, struct Packet
*pktin
)
5621 int typelen
, want_reply
;
5622 int reply
= SSH2_MSG_CHANNEL_FAILURE
; /* default */
5623 struct ssh_channel
*c
;
5624 struct Packet
*pktout
;
5626 localid
= ssh_pkt_getuint32(pktin
);
5627 ssh_pkt_getstring(pktin
, &type
, &typelen
);
5628 want_reply
= ssh2_pkt_getbool(pktin
);
5631 * First, check that the channel exists. Otherwise,
5632 * we can instantly disconnect with a rude message.
5634 c
= find234(ssh
->channels
, &localid
, ssh_channelfind
);
5637 sprintf(buf
, "Received channel request for nonexistent"
5638 " channel %d", localid
);
5640 pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
5641 ssh2_pkt_adduint32(pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
5642 ssh2_pkt_addstring(pktout
, buf
);
5643 ssh2_pkt_addstring(pktout
, "en"); /* language tag */
5644 ssh2_pkt_send_noqueue(ssh
, pktout
);
5645 connection_fatal(ssh
->frontend
, "%s", buf
);
5646 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
5651 * Having got the channel number, we now look at
5652 * the request type string to see if it's something
5655 if (c
== ssh
->mainchan
) {
5657 * We recognise "exit-status" and "exit-signal" on
5658 * the primary channel.
5660 if (typelen
== 11 &&
5661 !memcmp(type
, "exit-status", 11)) {
5663 ssh
->exitcode
= ssh_pkt_getuint32(pktin
);
5664 logeventf(ssh
, "Server sent command exit status %d",
5666 reply
= SSH2_MSG_CHANNEL_SUCCESS
;
5668 } else if (typelen
== 11 &&
5669 !memcmp(type
, "exit-signal", 11)) {
5671 int is_plausible
= TRUE
, is_int
= FALSE
;
5672 char *fmt_sig
= "", *fmt_msg
= "";
5674 int msglen
= 0, core
= FALSE
;
5675 /* ICK: older versions of OpenSSH (e.g. 3.4p1)
5676 * provide an `int' for the signal, despite its
5677 * having been a `string' in the drafts since at
5678 * least 2001. (Fixed in session.c 1.147.) Try to
5679 * infer which we can safely parse it as. */
5681 unsigned char *p
= pktin
->body
+
5683 long len
= pktin
->length
- pktin
->savedpos
;
5684 unsigned long num
= GET_32BIT(p
); /* what is it? */
5685 /* If it's 0, it hardly matters; assume string */
5689 int maybe_int
= FALSE
, maybe_str
= FALSE
;
5690 #define CHECK_HYPOTHESIS(offset, result) \
5693 if (q >= 0 && q+4 <= len) { \
5694 q = q + 4 + GET_32BIT(p+q); \
5695 if (q >= 0 && q+4 <= len && \
5696 (q = q + 4 + GET_32BIT(p+q)) && q == len) \
5700 CHECK_HYPOTHESIS(4+1, maybe_int
);
5701 CHECK_HYPOTHESIS(4+num
+1, maybe_str
);
5702 #undef CHECK_HYPOTHESIS
5703 if (maybe_int
&& !maybe_str
)
5705 else if (!maybe_int
&& maybe_str
)
5708 /* Crikey. Either or neither. Panic. */
5709 is_plausible
= FALSE
;
5714 /* Old non-standard OpenSSH. */
5715 int signum
= ssh_pkt_getuint32(pktin
);
5716 fmt_sig
= dupprintf(" %d", signum
);
5718 /* As per the drafts. */
5721 ssh_pkt_getstring(pktin
, &sig
, &siglen
);
5722 /* Signal name isn't supposed to be blank, but
5723 * let's cope gracefully if it is. */
5725 fmt_sig
= dupprintf(" \"%.*s\"",
5729 core
= ssh2_pkt_getbool(pktin
);
5730 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
5732 fmt_msg
= dupprintf(" (\"%.*s\")", msglen
, msg
);
5734 /* ignore lang tag */
5735 } /* else don't attempt to parse */
5736 logeventf(ssh
, "Server exited on signal%s%s%s",
5737 fmt_sig
, core ?
" (core dumped)" : "",
5739 if (*fmt_sig
) sfree(fmt_sig
);
5740 if (*fmt_msg
) sfree(fmt_msg
);
5741 reply
= SSH2_MSG_CHANNEL_SUCCESS
;
5746 * This is a channel request we don't know
5747 * about, so we now either ignore the request
5748 * or respond with CHANNEL_FAILURE, depending
5751 reply
= SSH2_MSG_CHANNEL_FAILURE
;
5754 pktout
= ssh2_pkt_init(reply
);
5755 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5756 ssh2_pkt_send(ssh
, pktout
);
5760 static void ssh2_msg_global_request(Ssh ssh
, struct Packet
*pktin
)
5763 int typelen
, want_reply
;
5764 struct Packet
*pktout
;
5766 ssh_pkt_getstring(pktin
, &type
, &typelen
);
5767 want_reply
= ssh2_pkt_getbool(pktin
);
5770 * We currently don't support any global requests
5771 * at all, so we either ignore the request or
5772 * respond with REQUEST_FAILURE, depending on
5776 pktout
= ssh2_pkt_init(SSH2_MSG_REQUEST_FAILURE
);
5777 ssh2_pkt_send(ssh
, pktout
);
5781 static void ssh2_msg_channel_open(Ssh ssh
, struct Packet
*pktin
)
5789 struct ssh_channel
*c
;
5790 unsigned remid
, winsize
, pktsize
;
5791 struct Packet
*pktout
;
5793 ssh_pkt_getstring(pktin
, &type
, &typelen
);
5794 c
= snew(struct ssh_channel
);
5797 remid
= ssh_pkt_getuint32(pktin
);
5798 winsize
= ssh_pkt_getuint32(pktin
);
5799 pktsize
= ssh_pkt_getuint32(pktin
);
5801 if (typelen
== 3 && !memcmp(type
, "x11", 3)) {
5804 ssh_pkt_getstring(pktin
, &peeraddr
, &peeraddrlen
);
5805 addrstr
= snewn(peeraddrlen
+1, char);
5806 memcpy(addrstr
, peeraddr
, peeraddrlen
);
5807 addrstr
[peeraddrlen
] = '\0';
5808 peerport
= ssh_pkt_getuint32(pktin
);
5810 logeventf(ssh
, "Received X11 connect request from %s:%d",
5813 if (!ssh
->X11_fwd_enabled
)
5814 error
= "X11 forwarding is not enabled";
5815 else if (x11_init(&c
->u
.x11
.s
, ssh
->cfg
.x11_display
, c
,
5816 ssh
->x11auth
, addrstr
, peerport
,
5817 &ssh
->cfg
) != NULL
) {
5818 error
= "Unable to open an X11 connection";
5820 logevent("Opening X11 forward connection succeeded");
5825 } else if (typelen
== 15 &&
5826 !memcmp(type
, "forwarded-tcpip", 15)) {
5827 struct ssh_rportfwd pf
, *realpf
;
5830 ssh_pkt_getstring(pktin
, &dummy
, &dummylen
);/* skip address */
5831 pf
.sport
= ssh_pkt_getuint32(pktin
);
5832 ssh_pkt_getstring(pktin
, &peeraddr
, &peeraddrlen
);
5833 peerport
= ssh_pkt_getuint32(pktin
);
5834 realpf
= find234(ssh
->rportfwds
, &pf
, NULL
);
5835 logeventf(ssh
, "Received remote port %d open request "
5836 "from %s:%d", pf
.sport
, peeraddr
, peerport
);
5837 if (realpf
== NULL
) {
5838 error
= "Remote port is not recognised";
5840 const char *e
= pfd_newconnect(&c
->u
.pfd
.s
,
5844 realpf
->pfrec
->addressfamily
);
5845 logeventf(ssh
, "Attempting to forward remote port to "
5846 "%s:%d", realpf
->dhost
, realpf
->dport
);
5848 logeventf(ssh
, "Port open failed: %s", e
);
5849 error
= "Port open failed";
5851 logevent("Forwarded port opened successfully");
5852 c
->type
= CHAN_SOCKDATA
;
5855 } else if (typelen
== 22 &&
5856 !memcmp(type
, "auth-agent@openssh.com", 3)) {
5857 if (!ssh
->agentfwd_enabled
)
5858 error
= "Agent forwarding is not enabled";
5860 c
->type
= CHAN_AGENT
; /* identify channel type */
5861 c
->u
.a
.lensofar
= 0;
5864 error
= "Unsupported channel type requested";
5867 c
->remoteid
= remid
;
5869 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_FAILURE
);
5870 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5871 ssh2_pkt_adduint32(pktout
, SSH2_OPEN_CONNECT_FAILED
);
5872 ssh2_pkt_addstring(pktout
, error
);
5873 ssh2_pkt_addstring(pktout
, "en"); /* language tag */
5874 ssh2_pkt_send(ssh
, pktout
);
5875 logeventf(ssh
, "Rejected channel open: %s", error
);
5878 c
->localid
= alloc_channel_id(ssh
);
5880 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
5881 c
->v
.v2
.remwindow
= winsize
;
5882 c
->v
.v2
.remmaxpkt
= pktsize
;
5883 bufchain_init(&c
->v
.v2
.outbuffer
);
5884 add234(ssh
->channels
, c
);
5885 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
);
5886 ssh2_pkt_adduint32(pktout
, c
->remoteid
);
5887 ssh2_pkt_adduint32(pktout
, c
->localid
);
5888 ssh2_pkt_adduint32(pktout
, c
->v
.v2
.locwindow
);
5889 ssh2_pkt_adduint32(pktout
, 0x4000UL
); /* our max pkt size */
5890 ssh2_pkt_send(ssh
, pktout
);
5895 * Handle the SSH2 userauth and connection layers.
5897 static void do_ssh2_authconn(Ssh ssh
, unsigned char *in
, int inlen
,
5898 struct Packet
*pktin
)
5900 struct do_ssh2_authconn_state
{
5902 AUTH_INVALID
, AUTH_PUBLICKEY_AGENT
, AUTH_PUBLICKEY_FILE
,
5904 AUTH_KEYBOARD_INTERACTIVE
5908 AUTH_TYPE_PUBLICKEY
,
5909 AUTH_TYPE_PUBLICKEY_OFFER_LOUD
,
5910 AUTH_TYPE_PUBLICKEY_OFFER_QUIET
,
5912 AUTH_TYPE_KEYBOARD_INTERACTIVE
,
5913 AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
5915 int gotit
, need_pw
, can_pubkey
, can_passwd
, can_keyb_inter
;
5916 int tried_pubkey_config
, tried_agent
, tried_keyb_inter
;
5917 int kbd_inter_running
;
5919 int num_prompts
, curr_prompt
, echo
;
5924 void *publickey_blob
;
5925 int publickey_bloblen
;
5926 unsigned char request
[5], *response
, *p
;
5930 char *pkblob
, *alg
, *commentp
;
5931 int pklen
, alglen
, commentlen
;
5932 int siglen
, retlen
, len
;
5933 char *q
, *agentreq
, *ret
;
5935 int num_env
, env_left
, env_ok
;
5936 struct Packet
*pktout
;
5938 crState(do_ssh2_authconn_state
);
5940 crBegin(ssh
->do_ssh2_authconn_crstate
);
5943 * Request userauth protocol, and await a response to it.
5945 s
->pktout
= ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST
);
5946 ssh2_pkt_addstring(s
->pktout
, "ssh-userauth");
5947 ssh2_pkt_send(ssh
, s
->pktout
);
5948 crWaitUntilV(pktin
);
5949 if (pktin
->type
!= SSH2_MSG_SERVICE_ACCEPT
) {
5950 bombout(("Server refused user authentication protocol"));
5955 * We repeat this whole loop, including the username prompt,
5956 * until we manage a successful authentication. If the user
5957 * types the wrong _password_, they can be sent back to the
5958 * beginning to try another username, if this is configured on.
5959 * (If they specify a username in the config, they are never
5960 * asked, even if they do give a wrong password.)
5962 * I think this best serves the needs of
5964 * - the people who have no configuration, no keys, and just
5965 * want to try repeated (username,password) pairs until they
5966 * type both correctly
5968 * - people who have keys and configuration but occasionally
5969 * need to fall back to passwords
5971 * - people with a key held in Pageant, who might not have
5972 * logged in to a particular machine before; so they want to
5973 * type a username, and then _either_ their key will be
5974 * accepted, _or_ they will type a password. If they mistype
5975 * the username they will want to be able to get back and
5978 s
->username
[0] = '\0';
5979 s
->got_username
= FALSE
;
5984 if (s
->got_username
&& !ssh
->cfg
.change_username
) {
5986 * We got a username last time round this loop, and
5987 * with change_username turned off we don't try to get
5990 } else if (!*ssh
->cfg
.username
) {
5991 if (ssh_get_line
&& !ssh_getline_pw_only
) {
5992 if (!ssh_get_line("login as: ",
5993 s
->username
, sizeof(s
->username
), FALSE
)) {
5995 * get_line failed to get a username.
5998 logevent("No username provided. Abandoning session.");
5999 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6003 int ret
; /* need not be saved across crReturn */
6004 c_write_str(ssh
, "login as: ");
6006 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
6008 crWaitUntilV(!pktin
);
6009 ret
= process_userpass_input(ssh
, in
, inlen
);
6013 c_write_str(ssh
, "\r\n");
6015 s
->username
[strcspn(s
->username
, "\n\r")] = '\0';
6018 strncpy(s
->username
, ssh
->cfg
.username
, sizeof(s
->username
));
6019 s
->username
[sizeof(s
->username
)-1] = '\0';
6020 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
6021 stuff
= dupprintf("Using username \"%s\".\r\n", s
->username
);
6022 c_write_str(ssh
, stuff
);
6026 s
->got_username
= TRUE
;
6029 * Send an authentication request using method "none": (a)
6030 * just in case it succeeds, and (b) so that we know what
6031 * authentication methods we can usefully try next.
6033 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6035 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6036 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6037 ssh2_pkt_addstring(s
->pktout
, "ssh-connection");/* service requested */
6038 ssh2_pkt_addstring(s
->pktout
, "none"); /* method */
6039 ssh2_pkt_send(ssh
, s
->pktout
);
6040 s
->type
= AUTH_TYPE_NONE
;
6042 s
->we_are_in
= FALSE
;
6044 s
->tried_pubkey_config
= FALSE
;
6045 s
->tried_agent
= FALSE
;
6046 s
->tried_keyb_inter
= FALSE
;
6047 s
->kbd_inter_running
= FALSE
;
6048 /* Load the pub half of ssh->cfg.keyfile so we notice if it's in Pageant */
6049 if (!filename_is_null(ssh
->cfg
.keyfile
)) {
6051 logeventf(ssh
, "Reading private key file \"%.150s\"",
6052 filename_to_str(&ssh
->cfg
.keyfile
));
6053 keytype
= key_type(&ssh
->cfg
.keyfile
);
6054 if (keytype
== SSH_KEYTYPE_SSH2
) {
6056 ssh2_userkey_loadpub(&ssh
->cfg
.keyfile
, NULL
,
6057 &s
->publickey_bloblen
, NULL
);
6060 logeventf(ssh
, "Unable to use this key file (%s)",
6061 key_type_to_str(keytype
));
6062 msgbuf
= dupprintf("Unable to use key file \"%.150s\""
6064 filename_to_str(&ssh
->cfg
.keyfile
),
6065 key_type_to_str(keytype
));
6066 c_write_str(ssh
, msgbuf
);
6068 s
->publickey_blob
= NULL
;
6071 s
->publickey_blob
= NULL
;
6075 * Wait for the result of the last authentication request.
6078 crWaitUntilV(pktin
);
6079 while (pktin
->type
== SSH2_MSG_USERAUTH_BANNER
) {
6083 * Don't show the banner if we're operating in
6084 * non-verbose non-interactive mode. (It's probably
6085 * a script, which means nobody will read the
6086 * banner _anyway_, and moreover the printing of
6087 * the banner will screw up processing on the
6088 * output of (say) plink.)
6090 if (flags
& (FLAG_VERBOSE
| FLAG_INTERACTIVE
)) {
6091 ssh_pkt_getstring(pktin
, &banner
, &size
);
6093 c_write_untrusted(ssh
, banner
, size
);
6095 crWaitUntilV(pktin
);
6097 if (pktin
->type
== SSH2_MSG_USERAUTH_SUCCESS
) {
6098 logevent("Access granted");
6099 s
->we_are_in
= TRUE
;
6103 if (s
->kbd_inter_running
&&
6104 pktin
->type
== SSH2_MSG_USERAUTH_INFO_REQUEST
) {
6106 * This is either a further set-of-prompts packet
6107 * in keyboard-interactive authentication, or it's
6108 * the same one and we came back here with `gotit'
6109 * set. In the former case, we must reset the
6110 * curr_prompt variable.
6114 } else if (pktin
->type
!= SSH2_MSG_USERAUTH_FAILURE
) {
6115 bombout(("Strange packet received during authentication: type %d",
6123 * OK, we're now sitting on a USERAUTH_FAILURE message, so
6124 * we can look at the string in it and know what we can
6125 * helpfully try next.
6127 if (pktin
->type
== SSH2_MSG_USERAUTH_FAILURE
) {
6130 ssh_pkt_getstring(pktin
, &methods
, &methlen
);
6131 s
->kbd_inter_running
= FALSE
;
6132 if (!ssh2_pkt_getbool(pktin
)) {
6134 * We have received an unequivocal Access
6135 * Denied. This can translate to a variety of
6138 * - if we'd just tried "none" authentication,
6139 * it's not worth printing anything at all
6141 * - if we'd just tried a public key _offer_,
6142 * the message should be "Server refused our
6143 * key" (or no message at all if the key
6144 * came from Pageant)
6146 * - if we'd just tried anything else, the
6147 * message really should be "Access denied".
6149 * Additionally, if we'd just tried password
6150 * authentication, we should break out of this
6151 * whole loop so as to go back to the username
6152 * prompt (iff we're configured to allow
6153 * username change attempts).
6155 if (s
->type
== AUTH_TYPE_NONE
) {
6157 } else if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
||
6158 s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_QUIET
) {
6159 if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
)
6160 c_write_str(ssh
, "Server refused our key\r\n");
6161 logevent("Server refused public key");
6162 } else if (s
->type
==AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
) {
6163 /* server declined keyboard-interactive; ignore */
6165 c_write_str(ssh
, "Access denied\r\n");
6166 logevent("Access denied");
6167 if (s
->type
== AUTH_TYPE_PASSWORD
&&
6168 ssh
->cfg
.change_username
) {
6169 /* XXX perhaps we should allow
6170 * keyboard-interactive to do this too? */
6171 s
->we_are_in
= FALSE
;
6176 c_write_str(ssh
, "Further authentication required\r\n");
6177 logevent("Further authentication required");
6181 in_commasep_string("publickey", methods
, methlen
);
6183 in_commasep_string("password", methods
, methlen
);
6184 s
->can_keyb_inter
= ssh
->cfg
.try_ki_auth
&&
6185 in_commasep_string("keyboard-interactive", methods
, methlen
);
6189 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6193 * Most password/passphrase prompts will be
6194 * non-echoing, so we set this to 0 by default.
6195 * Exception is that some keyboard-interactive prompts
6196 * can be echoing, in which case we'll set this to 1.
6200 if (!s
->method
&& s
->can_pubkey
&&
6201 agent_exists() && !s
->tried_agent
) {
6203 * Attempt public-key authentication using Pageant.
6208 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6209 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
6211 s
->tried_agent
= TRUE
;
6213 logevent("Pageant is running. Requesting keys.");
6215 /* Request the keys held by the agent. */
6216 PUT_32BIT(s
->request
, 1);
6217 s
->request
[4] = SSH2_AGENTC_REQUEST_IDENTITIES
;
6218 if (!agent_query(s
->request
, 5, &r
, &s
->responselen
,
6219 ssh_agent_callback
, ssh
)) {
6223 bombout(("Unexpected data from server while"
6224 " waiting for agent response"));
6227 } while (pktin
|| inlen
> 0);
6228 r
= ssh
->agent_response
;
6229 s
->responselen
= ssh
->agent_response_len
;
6231 s
->response
= (unsigned char *) r
;
6232 if (s
->response
&& s
->responselen
>= 5 &&
6233 s
->response
[4] == SSH2_AGENT_IDENTITIES_ANSWER
) {
6234 s
->p
= s
->response
+ 5;
6235 s
->nkeys
= GET_32BIT(s
->p
);
6239 sprintf(buf
, "Pageant has %d SSH2 keys", s
->nkeys
);
6242 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
6247 sprintf(buf
, "Trying Pageant key #%d", s
->keyi
);
6250 s
->pklen
= GET_32BIT(s
->p
);
6252 if (s
->publickey_blob
&&
6253 s
->pklen
== s
->publickey_bloblen
&&
6254 !memcmp(s
->p
, s
->publickey_blob
,
6255 s
->publickey_bloblen
)) {
6256 logevent("This key matches configured key file");
6257 s
->tried_pubkey_config
= 1;
6259 s
->pkblob
= (char *)s
->p
;
6261 s
->alglen
= GET_32BIT(s
->pkblob
);
6262 s
->alg
= s
->pkblob
+ 4;
6263 s
->commentlen
= GET_32BIT(s
->p
);
6265 s
->commentp
= (char *)s
->p
;
6266 s
->p
+= s
->commentlen
;
6267 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6268 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6269 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6270 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6271 ssh2_pkt_addbool(s
->pktout
, FALSE
); /* no signature included */
6272 ssh2_pkt_addstring_start(s
->pktout
);
6273 ssh2_pkt_addstring_data(s
->pktout
, s
->alg
, s
->alglen
);
6274 ssh2_pkt_addstring_start(s
->pktout
);
6275 ssh2_pkt_addstring_data(s
->pktout
, s
->pkblob
, s
->pklen
);
6276 ssh2_pkt_send(ssh
, s
->pktout
);
6278 crWaitUntilV(pktin
);
6279 if (pktin
->type
!= SSH2_MSG_USERAUTH_PK_OK
) {
6280 logevent("Key refused");
6284 if (flags
& FLAG_VERBOSE
) {
6285 c_write_str(ssh
, "Authenticating with "
6287 c_write(ssh
, s
->commentp
, s
->commentlen
);
6288 c_write_str(ssh
, "\" from agent\r\n");
6292 * Server is willing to accept the key.
6293 * Construct a SIGN_REQUEST.
6295 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6296 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6297 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6298 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6299 ssh2_pkt_addbool(s
->pktout
, TRUE
);
6300 ssh2_pkt_addstring_start(s
->pktout
);
6301 ssh2_pkt_addstring_data(s
->pktout
, s
->alg
, s
->alglen
);
6302 ssh2_pkt_addstring_start(s
->pktout
);
6303 ssh2_pkt_addstring_data(s
->pktout
, s
->pkblob
, s
->pklen
);
6305 s
->siglen
= s
->pktout
->length
- 5 + 4 + 20;
6306 if (ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)
6308 s
->len
= 1; /* message type */
6309 s
->len
+= 4 + s
->pklen
; /* key blob */
6310 s
->len
+= 4 + s
->siglen
; /* data to sign */
6311 s
->len
+= 4; /* flags */
6312 s
->agentreq
= snewn(4 + s
->len
, char);
6313 PUT_32BIT(s
->agentreq
, s
->len
);
6314 s
->q
= s
->agentreq
+ 4;
6315 *s
->q
++ = SSH2_AGENTC_SIGN_REQUEST
;
6316 PUT_32BIT(s
->q
, s
->pklen
);
6318 memcpy(s
->q
, s
->pkblob
, s
->pklen
);
6320 PUT_32BIT(s
->q
, s
->siglen
);
6322 /* Now the data to be signed... */
6323 if (!(ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)) {
6324 PUT_32BIT(s
->q
, 20);
6327 memcpy(s
->q
, ssh
->v2_session_id
, 20);
6329 memcpy(s
->q
, s
->pktout
->data
+ 5,
6330 s
->pktout
->length
- 5);
6331 s
->q
+= s
->pktout
->length
- 5;
6332 /* And finally the (zero) flags word. */
6334 if (!agent_query(s
->agentreq
, s
->len
+ 4,
6336 ssh_agent_callback
, ssh
)) {
6340 bombout(("Unexpected data from server"
6341 " while waiting for agent"
6345 } while (pktin
|| inlen
> 0);
6346 vret
= ssh
->agent_response
;
6347 s
->retlen
= ssh
->agent_response_len
;
6352 if (s
->ret
[4] == SSH2_AGENT_SIGN_RESPONSE
) {
6353 logevent("Sending Pageant's response");
6354 ssh2_add_sigblob(ssh
, s
->pktout
,
6355 s
->pkblob
, s
->pklen
,
6357 GET_32BIT(s
->ret
+ 5));
6358 ssh2_pkt_send(ssh
, s
->pktout
);
6363 ("Pageant failed to answer challenge");
6374 if (!s
->method
&& s
->can_pubkey
&& s
->publickey_blob
6375 && !s
->tried_pubkey_config
) {
6376 unsigned char *pub_blob
;
6377 char *algorithm
, *comment
;
6380 s
->tried_pubkey_config
= TRUE
;
6382 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6383 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
6386 * Try the public key supplied in the configuration.
6388 * First, offer the public blob to see if the server is
6389 * willing to accept it.
6392 (unsigned char *)ssh2_userkey_loadpub(&ssh
->cfg
.keyfile
,
6397 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6398 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6399 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6400 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6401 ssh2_pkt_addbool(s
->pktout
, FALSE
); /* no signature included */
6402 ssh2_pkt_addstring(s
->pktout
, algorithm
);
6403 ssh2_pkt_addstring_start(s
->pktout
);
6404 ssh2_pkt_addstring_data(s
->pktout
, (char *)pub_blob
,
6406 ssh2_pkt_send(ssh
, s
->pktout
);
6407 logevent("Offered public key");
6409 crWaitUntilV(pktin
);
6410 if (pktin
->type
!= SSH2_MSG_USERAUTH_PK_OK
) {
6412 s
->type
= AUTH_TYPE_PUBLICKEY_OFFER_LOUD
;
6413 continue; /* key refused; give up on it */
6416 logevent("Offer of public key accepted");
6418 * Actually attempt a serious authentication using
6421 if (ssh2_userkey_encrypted(&ssh
->cfg
.keyfile
, &comment
)) {
6422 sprintf(s
->pwprompt
,
6423 "Passphrase for key \"%.100s\": ",
6429 if (flags
& FLAG_VERBOSE
) {
6430 c_write_str(ssh
, "Authenticating with public key \"");
6431 c_write_str(ssh
, comment
);
6432 c_write_str(ssh
, "\"\r\n");
6434 s
->method
= AUTH_PUBLICKEY_FILE
;
6438 if (!s
->method
&& s
->can_keyb_inter
&& !s
->tried_keyb_inter
) {
6439 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
6440 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
6441 s
->tried_keyb_inter
= TRUE
;
6443 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6444 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
6446 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6447 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6448 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6449 ssh2_pkt_addstring(s
->pktout
, "keyboard-interactive"); /* method */
6450 ssh2_pkt_addstring(s
->pktout
, ""); /* lang */
6451 ssh2_pkt_addstring(s
->pktout
, "");
6452 ssh2_pkt_send(ssh
, s
->pktout
);
6454 crWaitUntilV(pktin
);
6455 if (pktin
->type
!= SSH2_MSG_USERAUTH_INFO_REQUEST
) {
6456 if (pktin
->type
== SSH2_MSG_USERAUTH_FAILURE
)
6458 logevent("Keyboard-interactive authentication refused");
6459 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
;
6463 s
->kbd_inter_running
= TRUE
;
6467 if (s
->kbd_inter_running
) {
6468 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
6469 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
6470 s
->tried_keyb_inter
= TRUE
;
6472 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6473 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
6475 if (s
->curr_prompt
== 0) {
6477 * We've got a fresh USERAUTH_INFO_REQUEST.
6478 * Display header data, and start going through
6481 char *name
, *inst
, *lang
;
6482 int name_len
, inst_len
, lang_len
;
6484 ssh_pkt_getstring(pktin
, &name
, &name_len
);
6485 ssh_pkt_getstring(pktin
, &inst
, &inst_len
);
6486 ssh_pkt_getstring(pktin
, &lang
, &lang_len
);
6488 c_write_untrusted(ssh
, name
, name_len
);
6489 c_write_str(ssh
, "\r\n");
6492 c_write_untrusted(ssh
, inst
, inst_len
);
6493 c_write_str(ssh
, "\r\n");
6495 s
->num_prompts
= ssh_pkt_getuint32(pktin
);
6499 * If there are prompts remaining in the packet,
6500 * display one and get a response.
6502 if (s
->curr_prompt
< s
->num_prompts
) {
6506 ssh_pkt_getstring(pktin
, &prompt
, &prompt_len
);
6507 if (prompt_len
> 0) {
6508 static const char trunc
[] = "<prompt truncated>: ";
6509 static const int prlen
= sizeof(s
->pwprompt
) -
6511 if (prompt_len
> prlen
) {
6512 memcpy(s
->pwprompt
, prompt
, prlen
);
6513 strcpy(s
->pwprompt
+ prlen
, trunc
);
6515 memcpy(s
->pwprompt
, prompt
, prompt_len
);
6516 s
->pwprompt
[prompt_len
] = '\0';
6520 "<server failed to send prompt>: ");
6522 s
->echo
= ssh2_pkt_getbool(pktin
);
6528 if (!s
->method
&& s
->can_passwd
) {
6529 s
->method
= AUTH_PASSWORD
;
6530 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
6531 ssh
->pkt_ctx
|= SSH2_PKTCTX_PASSWORD
;
6532 sprintf(s
->pwprompt
, "%.90s@%.90s's password: ", s
->username
,
6539 if (!ssh_get_line(s
->pwprompt
, s
->password
,
6540 sizeof(s
->password
), TRUE
)) {
6542 * get_line failed to get a password (for
6543 * example because one was supplied on the
6544 * command line which has already failed to
6547 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
6548 ssh2_pkt_adduint32(s
->pktout
,SSH2_DISCONNECT_BY_APPLICATION
);
6549 ssh2_pkt_addstring(s
->pktout
, "No more passwords available"
6551 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
6552 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
6553 logevent("Unable to authenticate");
6554 connection_fatal(ssh
->frontend
,
6555 "Unable to authenticate");
6556 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6560 int ret
; /* need not be saved across crReturn */
6561 c_write_untrusted(ssh
, s
->pwprompt
, strlen(s
->pwprompt
));
6564 setup_userpass_input(ssh
, s
->password
,
6565 sizeof(s
->password
), s
->echo
);
6567 crWaitUntilV(!pktin
);
6568 ret
= process_userpass_input(ssh
, in
, inlen
);
6572 c_write_str(ssh
, "\r\n");
6576 if (s
->method
== AUTH_PUBLICKEY_FILE
) {
6578 * We have our passphrase. Now try the actual authentication.
6580 struct ssh2_userkey
*key
;
6581 const char *error
= NULL
;
6583 key
= ssh2_load_userkey(&ssh
->cfg
.keyfile
, s
->password
,
6585 if (key
== SSH2_WRONG_PASSPHRASE
|| key
== NULL
) {
6586 if (key
== SSH2_WRONG_PASSPHRASE
) {
6587 c_write_str(ssh
, "Wrong passphrase\r\n");
6588 s
->tried_pubkey_config
= FALSE
;
6590 c_write_str(ssh
, "Unable to load private key (");
6591 c_write_str(ssh
, error
);
6592 c_write_str(ssh
, ")\r\n");
6593 s
->tried_pubkey_config
= TRUE
;
6595 /* Send a spurious AUTH_NONE to return to the top. */
6596 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6597 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6598 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6599 ssh2_pkt_addstring(s
->pktout
, "none"); /* method */
6600 ssh2_pkt_send(ssh
, s
->pktout
);
6601 s
->type
= AUTH_TYPE_NONE
;
6603 unsigned char *pkblob
, *sigblob
, *sigdata
;
6604 int pkblob_len
, sigblob_len
, sigdata_len
;
6608 * We have loaded the private key and the server
6609 * has announced that it's willing to accept it.
6610 * Hallelujah. Generate a signature and send it.
6612 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6613 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6614 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6615 ssh2_pkt_addstring(s
->pktout
, "publickey"); /* method */
6616 ssh2_pkt_addbool(s
->pktout
, TRUE
);
6617 ssh2_pkt_addstring(s
->pktout
, key
->alg
->name
);
6618 pkblob
= key
->alg
->public_blob(key
->data
, &pkblob_len
);
6619 ssh2_pkt_addstring_start(s
->pktout
);
6620 ssh2_pkt_addstring_data(s
->pktout
, (char *)pkblob
, pkblob_len
);
6623 * The data to be signed is:
6627 * followed by everything so far placed in the
6630 sigdata_len
= s
->pktout
->length
- 5 + 4 + 20;
6631 if (ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)
6633 sigdata
= snewn(sigdata_len
, unsigned char);
6635 if (!(ssh
->remote_bugs
& BUG_SSH2_PK_SESSIONID
)) {
6636 PUT_32BIT(sigdata
+p
, 20);
6639 memcpy(sigdata
+p
, ssh
->v2_session_id
, 20); p
+= 20;
6640 memcpy(sigdata
+p
, s
->pktout
->data
+ 5,
6641 s
->pktout
->length
- 5);
6642 p
+= s
->pktout
->length
- 5;
6643 assert(p
== sigdata_len
);
6644 sigblob
= key
->alg
->sign(key
->data
, (char *)sigdata
,
6645 sigdata_len
, &sigblob_len
);
6646 ssh2_add_sigblob(ssh
, s
->pktout
, pkblob
, pkblob_len
,
6647 sigblob
, sigblob_len
);
6652 ssh2_pkt_send(ssh
, s
->pktout
);
6653 s
->type
= AUTH_TYPE_PUBLICKEY
;
6654 key
->alg
->freekey(key
->data
);
6656 } else if (s
->method
== AUTH_PASSWORD
) {
6658 * We send the password packet lumped tightly together with
6659 * an SSH_MSG_IGNORE packet. The IGNORE packet contains a
6660 * string long enough to make the total length of the two
6661 * packets constant. This should ensure that a passive
6662 * listener doing traffic analyis can't work out the length
6665 * For this to work, we need an assumption about the
6666 * maximum length of the password packet. I think 256 is
6667 * pretty conservative. Anyone using a password longer than
6668 * that probably doesn't have much to worry about from
6669 * people who find out how long their password is!
6671 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
6672 ssh2_pkt_addstring(s
->pktout
, s
->username
);
6673 ssh2_pkt_addstring(s
->pktout
, "ssh-connection"); /* service requested */
6674 ssh2_pkt_addstring(s
->pktout
, "password");
6675 ssh2_pkt_addbool(s
->pktout
, FALSE
);
6676 dont_log_password(ssh
, s
->pktout
, PKTLOG_BLANK
);
6677 ssh2_pkt_addstring(s
->pktout
, s
->password
);
6678 memset(s
->password
, 0, sizeof(s
->password
));
6679 end_log_omission(ssh
, s
->pktout
);
6680 ssh2_pkt_defer(ssh
, s
->pktout
);
6682 * We'll include a string that's an exact multiple of the
6683 * cipher block size. If the cipher is NULL for some
6684 * reason, we don't do this trick at all because we gain
6687 if (ssh
->cscipher
) {
6690 stringlen
= (256 - ssh
->deferred_len
);
6691 stringlen
+= ssh
->cscipher
->blksize
- 1;
6692 stringlen
-= (stringlen
% ssh
->cscipher
->blksize
);
6695 * Temporarily disable actual compression,
6696 * so we can guarantee to get this string
6697 * exactly the length we want it. The
6698 * compression-disabling routine should
6699 * return an integer indicating how many
6700 * bytes we should adjust our string length
6704 ssh
->cscomp
->disable_compression(ssh
->cs_comp_ctx
);
6706 s
->pktout
= ssh2_pkt_init(SSH2_MSG_IGNORE
);
6707 ssh2_pkt_addstring_start(s
->pktout
);
6708 for (i
= 0; i
< stringlen
; i
++) {
6709 char c
= (char) random_byte();
6710 ssh2_pkt_addstring_data(s
->pktout
, &c
, 1);
6712 ssh2_pkt_defer(ssh
, s
->pktout
);
6714 ssh_pkt_defersend(ssh
);
6715 logevent("Sent password");
6716 s
->type
= AUTH_TYPE_PASSWORD
;
6717 } else if (s
->method
== AUTH_KEYBOARD_INTERACTIVE
) {
6718 if (s
->curr_prompt
== 0) {
6719 s
->pktout
= ssh2_pkt_init(SSH2_MSG_USERAUTH_INFO_RESPONSE
);
6720 ssh2_pkt_adduint32(s
->pktout
, s
->num_prompts
);
6722 if (s
->need_pw
) { /* only add pw if we just got one! */
6723 dont_log_password(ssh
, s
->pktout
, PKTLOG_BLANK
);
6724 ssh2_pkt_addstring(s
->pktout
, s
->password
);
6725 memset(s
->password
, 0, sizeof(s
->password
));
6726 end_log_omission(ssh
, s
->pktout
);
6729 if (s
->curr_prompt
>= s
->num_prompts
) {
6730 ssh2_pkt_send(ssh
, s
->pktout
);
6733 * If there are prompts remaining, we set
6734 * `gotit' so that we won't attempt to get
6735 * another packet. Then we go back round the
6736 * loop and will end up retrieving another
6737 * prompt out of the existing packet. Funky or
6742 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
6744 c_write_str(ssh
, "No supported authentication methods"
6745 " left to try!\r\n");
6746 logevent("No supported authentications offered."
6748 s
->pktout
= ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
6749 ssh2_pkt_adduint32(s
->pktout
, SSH2_DISCONNECT_BY_APPLICATION
);
6750 ssh2_pkt_addstring(s
->pktout
, "No supported authentication"
6751 " methods available");
6752 ssh2_pkt_addstring(s
->pktout
, "en"); /* language tag */
6753 ssh2_pkt_send_noqueue(ssh
, s
->pktout
);
6754 ssh_closing((Plug
)ssh
, NULL
, 0, 0);
6758 } while (!s
->we_are_in
);
6761 * Now we're authenticated for the connection protocol. The
6762 * connection protocol will automatically have started at this
6763 * point; there's no need to send SERVICE_REQUEST.
6766 ssh
->channels
= newtree234(ssh_channelcmp
);
6769 * Set up handlers for some connection protocol messages, so we
6770 * don't have to handle them repeatedly in this coroutine.
6772 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_WINDOW_ADJUST
] =
6773 ssh2_msg_channel_window_adjust
;
6774 ssh
->packet_dispatch
[SSH2_MSG_GLOBAL_REQUEST
] =
6775 ssh2_msg_global_request
;
6778 * Create the main session channel.
6780 if (!ssh
->cfg
.ssh_no_shell
) {
6781 ssh
->mainchan
= snew(struct ssh_channel
);
6782 ssh
->mainchan
->ssh
= ssh
;
6783 ssh
->mainchan
->localid
= alloc_channel_id(ssh
);
6784 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
6785 ssh2_pkt_addstring(s
->pktout
, "session");
6786 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->localid
);
6787 ssh
->mainchan
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
6788 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->v
.v2
.locwindow
);/* our window size */
6789 ssh2_pkt_adduint32(s
->pktout
, 0x4000UL
); /* our max pkt size */
6790 ssh2_pkt_send(ssh
, s
->pktout
);
6791 crWaitUntilV(pktin
);
6792 if (pktin
->type
!= SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
6793 bombout(("Server refused to open a session"));
6795 /* FIXME: error data comes back in FAILURE packet */
6797 if (ssh_pkt_getuint32(pktin
) != ssh
->mainchan
->localid
) {
6798 bombout(("Server's channel confirmation cited wrong channel"));
6801 ssh
->mainchan
->remoteid
= ssh_pkt_getuint32(pktin
);
6802 ssh
->mainchan
->type
= CHAN_MAINSESSION
;
6803 ssh
->mainchan
->closes
= 0;
6804 ssh
->mainchan
->v
.v2
.remwindow
= ssh_pkt_getuint32(pktin
);
6805 ssh
->mainchan
->v
.v2
.remmaxpkt
= ssh_pkt_getuint32(pktin
);
6806 bufchain_init(&ssh
->mainchan
->v
.v2
.outbuffer
);
6807 add234(ssh
->channels
, ssh
->mainchan
);
6808 update_specials_menu(ssh
->frontend
);
6809 logevent("Opened channel for session");
6811 ssh
->mainchan
= NULL
;
6814 * Now we have a channel, make dispatch table entries for
6815 * general channel-based messages.
6817 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_DATA
] =
6818 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EXTENDED_DATA
] =
6819 ssh2_msg_channel_data
;
6820 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EOF
] = ssh2_msg_channel_eof
;
6821 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_CLOSE
] = ssh2_msg_channel_close
;
6822 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
] =
6823 ssh2_msg_channel_open_confirmation
;
6824 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_FAILURE
] =
6825 ssh2_msg_channel_open_failure
;
6826 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_REQUEST
] =
6827 ssh2_msg_channel_request
;
6828 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN
] =
6829 ssh2_msg_channel_open
;
6832 * Potentially enable X11 forwarding.
6834 if (ssh
->mainchan
&& ssh
->cfg
.x11_forward
) {
6835 char proto
[20], data
[64];
6836 logevent("Requesting X11 forwarding");
6837 ssh
->x11auth
= x11_invent_auth(proto
, sizeof(proto
),
6838 data
, sizeof(data
), ssh
->cfg
.x11_auth
);
6839 x11_get_real_auth(ssh
->x11auth
, ssh
->cfg
.x11_display
);
6840 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
6841 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
6842 ssh2_pkt_addstring(s
->pktout
, "x11-req");
6843 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6844 ssh2_pkt_addbool(s
->pktout
, 0); /* many connections */
6845 ssh2_pkt_addstring(s
->pktout
, proto
);
6846 ssh2_pkt_addstring(s
->pktout
, data
);
6847 ssh2_pkt_adduint32(s
->pktout
, x11_get_screen_number(ssh
->cfg
.x11_display
));
6848 ssh2_pkt_send(ssh
, s
->pktout
);
6850 crWaitUntilV(pktin
);
6852 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
6853 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
6854 bombout(("Unexpected response to X11 forwarding request:"
6855 " packet type %d", pktin
->type
));
6858 logevent("X11 forwarding refused");
6860 logevent("X11 forwarding enabled");
6861 ssh
->X11_fwd_enabled
= TRUE
;
6866 * Enable port forwardings.
6868 ssh_setup_portfwd(ssh
, &ssh
->cfg
);
6871 * Potentially enable agent forwarding.
6873 if (ssh
->mainchan
&& ssh
->cfg
.agentfwd
&& agent_exists()) {
6874 logevent("Requesting OpenSSH-style agent forwarding");
6875 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
6876 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
6877 ssh2_pkt_addstring(s
->pktout
, "auth-agent-req@openssh.com");
6878 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6879 ssh2_pkt_send(ssh
, s
->pktout
);
6881 crWaitUntilV(pktin
);
6883 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
6884 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
6885 bombout(("Unexpected response to agent forwarding request:"
6886 " packet type %d", pktin
->type
));
6889 logevent("Agent forwarding refused");
6891 logevent("Agent forwarding enabled");
6892 ssh
->agentfwd_enabled
= TRUE
;
6897 * Now allocate a pty for the session.
6899 if (ssh
->mainchan
&& !ssh
->cfg
.nopty
) {
6900 /* Unpick the terminal-speed string. */
6901 /* XXX perhaps we should allow no speeds to be sent. */
6902 ssh
->ospeed
= 38400; ssh
->ispeed
= 38400; /* last-resort defaults */
6903 sscanf(ssh
->cfg
.termspeed
, "%d,%d", &ssh
->ospeed
, &ssh
->ispeed
);
6904 /* Build the pty request. */
6905 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
6906 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
); /* recipient channel */
6907 ssh2_pkt_addstring(s
->pktout
, "pty-req");
6908 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6909 ssh2_pkt_addstring(s
->pktout
, ssh
->cfg
.termtype
);
6910 ssh2_pkt_adduint32(s
->pktout
, ssh
->term_width
);
6911 ssh2_pkt_adduint32(s
->pktout
, ssh
->term_height
);
6912 ssh2_pkt_adduint32(s
->pktout
, 0); /* pixel width */
6913 ssh2_pkt_adduint32(s
->pktout
, 0); /* pixel height */
6914 ssh2_pkt_addstring_start(s
->pktout
);
6915 ssh2_pkt_addbyte(s
->pktout
, 128); /* TTY_OP_ISPEED */
6916 ssh2_pkt_adduint32(s
->pktout
, ssh
->ispeed
);
6917 ssh2_pkt_addbyte(s
->pktout
, 129); /* TTY_OP_OSPEED */
6918 ssh2_pkt_adduint32(s
->pktout
, ssh
->ospeed
);
6919 ssh2_pkt_addstring_data(s
->pktout
, "\0", 1); /* TTY_OP_END */
6920 ssh2_pkt_send(ssh
, s
->pktout
);
6921 ssh
->state
= SSH_STATE_INTERMED
;
6923 crWaitUntilV(pktin
);
6925 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
6926 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
6927 bombout(("Unexpected response to pty request:"
6928 " packet type %d", pktin
->type
));
6931 c_write_str(ssh
, "Server refused to allocate pty\r\n");
6932 ssh
->editing
= ssh
->echoing
= 1;
6934 logeventf(ssh
, "Allocated pty (ospeed %dbps, ispeed %dbps)",
6935 ssh
->ospeed
, ssh
->ispeed
);
6938 ssh
->editing
= ssh
->echoing
= 1;
6942 * Send environment variables.
6944 * Simplest thing here is to send all the requests at once, and
6945 * then wait for a whole bunch of successes or failures.
6947 if (ssh
->mainchan
&& *ssh
->cfg
.environmt
) {
6948 char *e
= ssh
->cfg
.environmt
;
6949 char *var
, *varend
, *val
;
6955 while (*e
&& *e
!= '\t') e
++;
6957 if (*e
== '\t') e
++;
6962 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
6963 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
);
6964 ssh2_pkt_addstring(s
->pktout
, "env");
6965 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
6966 ssh2_pkt_addstring_start(s
->pktout
);
6967 ssh2_pkt_addstring_data(s
->pktout
, var
, varend
-var
);
6968 ssh2_pkt_addstring(s
->pktout
, val
);
6969 ssh2_pkt_send(ssh
, s
->pktout
);
6974 logeventf(ssh
, "Sent %d environment variables", s
->num_env
);
6977 s
->env_left
= s
->num_env
;
6979 while (s
->env_left
> 0) {
6980 crWaitUntilV(pktin
);
6982 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
6983 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
6984 bombout(("Unexpected response to environment request:"
6985 " packet type %d", pktin
->type
));
6995 if (s
->env_ok
== s
->num_env
) {
6996 logevent("All environment variables successfully set");
6997 } else if (s
->env_ok
== 0) {
6998 logevent("All environment variables refused");
6999 c_write_str(ssh
, "Server refused to set environment variables\r\n");
7001 logeventf(ssh
, "%d environment variables refused",
7002 s
->num_env
- s
->env_ok
);
7003 c_write_str(ssh
, "Server refused to set all environment variables\r\n");
7008 * Start a shell or a remote command. We may have to attempt
7009 * this twice if the config data has provided a second choice
7012 if (ssh
->mainchan
) while (1) {
7016 if (ssh
->fallback_cmd
) {
7017 subsys
= ssh
->cfg
.ssh_subsys2
;
7018 cmd
= ssh
->cfg
.remote_cmd_ptr2
;
7020 subsys
= ssh
->cfg
.ssh_subsys
;
7021 cmd
= ssh
->cfg
.remote_cmd_ptr
;
7024 s
->pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7025 ssh2_pkt_adduint32(s
->pktout
, ssh
->mainchan
->remoteid
); /* recipient channel */
7027 ssh2_pkt_addstring(s
->pktout
, "subsystem");
7028 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7029 ssh2_pkt_addstring(s
->pktout
, cmd
);
7031 ssh2_pkt_addstring(s
->pktout
, "exec");
7032 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7033 ssh2_pkt_addstring(s
->pktout
, cmd
);
7035 ssh2_pkt_addstring(s
->pktout
, "shell");
7036 ssh2_pkt_addbool(s
->pktout
, 1); /* want reply */
7038 ssh2_pkt_send(ssh
, s
->pktout
);
7040 crWaitUntilV(pktin
);
7042 if (pktin
->type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
7043 if (pktin
->type
!= SSH2_MSG_CHANNEL_FAILURE
) {
7044 bombout(("Unexpected response to shell/command request:"
7045 " packet type %d", pktin
->type
));
7049 * We failed to start the command. If this is the
7050 * fallback command, we really are finished; if it's
7051 * not, and if the fallback command exists, try falling
7052 * back to it before complaining.
7054 if (!ssh
->fallback_cmd
&& ssh
->cfg
.remote_cmd_ptr2
!= NULL
) {
7055 logevent("Primary command failed; attempting fallback");
7056 ssh
->fallback_cmd
= TRUE
;
7059 bombout(("Server refused to start a shell/command"));
7062 logevent("Started a shell/command");
7067 ssh
->state
= SSH_STATE_SESSION
;
7068 if (ssh
->size_needed
)
7069 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
7070 if (ssh
->eof_needed
)
7071 ssh_special(ssh
, TS_EOF
);
7077 ldisc_send(ssh
->ldisc
, NULL
, 0, 0);/* cause ldisc to notice changes */
7082 s
->try_send
= FALSE
;
7086 * _All_ the connection-layer packets we expect to
7087 * receive are now handled by the dispatch table.
7088 * Anything that reaches here must be bogus.
7091 bombout(("Strange packet received: type %d", pktin
->type
));
7093 } else if (ssh
->mainchan
) {
7095 * We have spare data. Add it to the channel buffer.
7097 ssh2_add_channel_data(ssh
->mainchan
, (char *)in
, inlen
);
7102 struct ssh_channel
*c
;
7104 * Try to send data on all channels if we can.
7106 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
7109 continue; /* don't send on closing channels */
7110 bufsize
= ssh2_try_send(c
);
7113 case CHAN_MAINSESSION
:
7114 /* stdin need not receive an unthrottle
7115 * notification since it will be polled */
7118 x11_unthrottle(c
->u
.x11
.s
);
7121 /* agent sockets are request/response and need no
7122 * buffer management */
7125 pfd_unthrottle(c
->u
.pfd
.s
);
7137 * Handlers for SSH2 messages that might arrive at any moment.
7139 void ssh2_msg_disconnect(Ssh ssh
, struct Packet
*pktin
)
7141 /* log reason code in disconnect message */
7143 int nowlen
, reason
, msglen
;
7145 reason
= ssh_pkt_getuint32(pktin
);
7146 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
7148 if (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) {
7149 buf
= dupprintf("Received disconnect message (%s)",
7150 ssh2_disconnect_reasons
[reason
]);
7152 buf
= dupprintf("Received disconnect message (unknown"
7153 " type %d)", reason
);
7157 buf
= dupprintf("Disconnection message text: %n%.*s",
7158 &nowlen
, msglen
, msg
);
7160 bombout(("Server sent disconnect message\ntype %d (%s):\n\"%s\"",
7162 (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) ?
7163 ssh2_disconnect_reasons
[reason
] : "unknown",
7168 void ssh2_msg_debug(Ssh ssh
, struct Packet
*pktin
)
7170 /* log the debug message */
7175 /* XXX maybe we should actually take notice of this */
7176 always_display
= ssh2_pkt_getbool(pktin
);
7177 ssh_pkt_getstring(pktin
, &msg
, &msglen
);
7179 buf
= dupprintf("Remote debug message: %.*s", msglen
, msg
);
7184 void ssh2_msg_something_unimplemented(Ssh ssh
, struct Packet
*pktin
)
7186 struct Packet
*pktout
;
7187 pktout
= ssh2_pkt_init(SSH2_MSG_UNIMPLEMENTED
);
7188 ssh2_pkt_adduint32(pktout
, pktin
->sequence
);
7190 * UNIMPLEMENTED messages MUST appear in the same order as the
7191 * messages they respond to. Hence, never queue them.
7193 ssh2_pkt_send_noqueue(ssh
, pktout
);
7197 * Handle the top-level SSH2 protocol.
7199 static void ssh2_protocol_setup(Ssh ssh
)
7204 * Most messages cause SSH2_MSG_UNIMPLEMENTED.
7206 for (i
= 0; i
< 256; i
++)
7207 ssh
->packet_dispatch
[i
] = ssh2_msg_something_unimplemented
;
7210 * Any message we actually understand, we set to NULL so that
7211 * the coroutines will get it.
7213 ssh
->packet_dispatch
[SSH2_MSG_UNIMPLEMENTED
] = NULL
;
7214 ssh
->packet_dispatch
[SSH2_MSG_SERVICE_REQUEST
] = NULL
;
7215 ssh
->packet_dispatch
[SSH2_MSG_SERVICE_ACCEPT
] = NULL
;
7216 ssh
->packet_dispatch
[SSH2_MSG_KEXINIT
] = NULL
;
7217 ssh
->packet_dispatch
[SSH2_MSG_NEWKEYS
] = NULL
;
7218 ssh
->packet_dispatch
[SSH2_MSG_KEXDH_INIT
] = NULL
;
7219 ssh
->packet_dispatch
[SSH2_MSG_KEXDH_REPLY
] = NULL
;
7220 /* ssh->packet_dispatch[SSH2_MSG_KEX_DH_GEX_REQUEST] = NULL; duplicate case value */
7221 /* ssh->packet_dispatch[SSH2_MSG_KEX_DH_GEX_GROUP] = NULL; duplicate case value */
7222 ssh
->packet_dispatch
[SSH2_MSG_KEX_DH_GEX_INIT
] = NULL
;
7223 ssh
->packet_dispatch
[SSH2_MSG_KEX_DH_GEX_REPLY
] = NULL
;
7224 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_REQUEST
] = NULL
;
7225 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_FAILURE
] = NULL
;
7226 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_SUCCESS
] = NULL
;
7227 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_BANNER
] = NULL
;
7228 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_PK_OK
] = NULL
;
7229 /* ssh->packet_dispatch[SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ] = NULL; duplicate case value */
7230 /* ssh->packet_dispatch[SSH2_MSG_USERAUTH_INFO_REQUEST] = NULL; duplicate case value */
7231 ssh
->packet_dispatch
[SSH2_MSG_USERAUTH_INFO_RESPONSE
] = NULL
;
7232 ssh
->packet_dispatch
[SSH2_MSG_GLOBAL_REQUEST
] = NULL
;
7233 ssh
->packet_dispatch
[SSH2_MSG_REQUEST_SUCCESS
] = NULL
;
7234 ssh
->packet_dispatch
[SSH2_MSG_REQUEST_FAILURE
] = NULL
;
7235 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN
] = NULL
;
7236 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
] = NULL
;
7237 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_OPEN_FAILURE
] = NULL
;
7238 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_WINDOW_ADJUST
] = NULL
;
7239 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_DATA
] = NULL
;
7240 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EXTENDED_DATA
] = NULL
;
7241 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_EOF
] = NULL
;
7242 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_CLOSE
] = NULL
;
7243 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_REQUEST
] = NULL
;
7244 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_SUCCESS
] = NULL
;
7245 ssh
->packet_dispatch
[SSH2_MSG_CHANNEL_FAILURE
] = NULL
;
7248 * These special message types we install handlers for.
7250 ssh
->packet_dispatch
[SSH2_MSG_DISCONNECT
] = ssh2_msg_disconnect
;
7251 ssh
->packet_dispatch
[SSH2_MSG_IGNORE
] = ssh_msg_ignore
; /* shared with ssh1 */
7252 ssh
->packet_dispatch
[SSH2_MSG_DEBUG
] = ssh2_msg_debug
;
7255 static void ssh2_timer(void *ctx
, long now
)
7259 if (!ssh
->kex_in_progress
&& ssh
->cfg
.ssh_rekey_time
!= 0 &&
7260 now
- ssh
->next_rekey
>= 0) {
7261 do_ssh2_transport(ssh
, "Initiating key re-exchange (timeout)",
7266 static void ssh2_protocol(Ssh ssh
, unsigned char *in
, int inlen
,
7267 struct Packet
*pktin
)
7269 if (ssh
->state
== SSH_STATE_CLOSED
)
7273 ssh
->incoming_data_size
+= pktin
->encrypted_len
;
7274 if (!ssh
->kex_in_progress
&&
7275 ssh
->max_data_size
!= 0 &&
7276 ssh
->incoming_data_size
> ssh
->max_data_size
)
7277 do_ssh2_transport(ssh
, "Initiating key re-exchange "
7278 "(too much data received)", -1, NULL
);
7281 if (pktin
&& ssh
->packet_dispatch
[pktin
->type
]) {
7282 ssh
->packet_dispatch
[pktin
->type
](ssh
, pktin
);
7286 if (!ssh
->protocol_initial_phase_done
||
7287 (pktin
&& pktin
->type
>= 20 && pktin
->type
< 50)) {
7288 if (do_ssh2_transport(ssh
, in
, inlen
, pktin
) &&
7289 !ssh
->protocol_initial_phase_done
) {
7290 ssh
->protocol_initial_phase_done
= TRUE
;
7292 * Allow authconn to initialise itself.
7294 do_ssh2_authconn(ssh
, NULL
, 0, NULL
);
7297 do_ssh2_authconn(ssh
, in
, inlen
, pktin
);
7302 * Called to set up the connection.
7304 * Returns an error message, or NULL on success.
7306 static const char *ssh_init(void *frontend_handle
, void **backend_handle
,
7308 char *host
, int port
, char **realhost
, int nodelay
,
7314 ssh
= snew(struct ssh_tag
);
7315 ssh
->cfg
= *cfg
; /* STRUCTURE COPY */
7316 ssh
->version
= 0; /* when not ready yet */
7319 ssh
->v1_cipher_ctx
= NULL
;
7320 ssh
->crcda_ctx
= NULL
;
7321 ssh
->cscipher
= NULL
;
7322 ssh
->cs_cipher_ctx
= NULL
;
7323 ssh
->sccipher
= NULL
;
7324 ssh
->sc_cipher_ctx
= NULL
;
7326 ssh
->cs_mac_ctx
= NULL
;
7328 ssh
->sc_mac_ctx
= NULL
;
7330 ssh
->cs_comp_ctx
= NULL
;
7332 ssh
->sc_comp_ctx
= NULL
;
7334 ssh
->kex_ctx
= NULL
;
7335 ssh
->hostkey
= NULL
;
7337 ssh
->state
= SSH_STATE_PREPACKET
;
7338 ssh
->size_needed
= FALSE
;
7339 ssh
->eof_needed
= FALSE
;
7342 ssh
->deferred_send_data
= NULL
;
7343 ssh
->deferred_len
= 0;
7344 ssh
->deferred_size
= 0;
7345 ssh
->fallback_cmd
= 0;
7347 ssh
->x11auth
= NULL
;
7348 ssh
->v1_compressing
= FALSE
;
7349 ssh
->v2_outgoing_sequence
= 0;
7350 ssh
->ssh1_rdpkt_crstate
= 0;
7351 ssh
->ssh2_rdpkt_crstate
= 0;
7352 ssh
->do_ssh_init_crstate
= 0;
7353 ssh
->ssh_gotdata_crstate
= 0;
7354 ssh
->do_ssh1_connection_crstate
= 0;
7355 ssh
->do_ssh1_login_crstate
= 0;
7356 ssh
->do_ssh2_transport_crstate
= 0;
7357 ssh
->do_ssh2_authconn_crstate
= 0;
7358 ssh
->do_ssh_init_state
= NULL
;
7359 ssh
->do_ssh1_login_state
= NULL
;
7360 ssh
->do_ssh2_transport_state
= NULL
;
7361 ssh
->do_ssh2_authconn_state
= NULL
;
7362 ssh
->mainchan
= NULL
;
7363 ssh
->throttled_all
= 0;
7364 ssh
->v1_stdout_throttling
= 0;
7366 ssh
->queuelen
= ssh
->queuesize
= 0;
7367 ssh
->queueing
= FALSE
;
7368 ssh
->qhead
= ssh
->qtail
= NULL
;
7370 *backend_handle
= ssh
;
7373 if (crypto_startup() == 0)
7374 return "Microsoft high encryption pack not installed!";
7377 ssh
->frontend
= frontend_handle
;
7378 ssh
->term_width
= ssh
->cfg
.width
;
7379 ssh
->term_height
= ssh
->cfg
.height
;
7381 ssh
->channels
= NULL
;
7382 ssh
->rportfwds
= NULL
;
7383 ssh
->portfwds
= NULL
;
7388 ssh
->v1_throttle_count
= 0;
7389 ssh
->overall_bufsize
= 0;
7390 ssh
->fallback_cmd
= 0;
7392 ssh
->protocol
= NULL
;
7394 ssh
->protocol_initial_phase_done
= FALSE
;
7398 ssh
->incoming_data_size
= ssh
->outgoing_data_size
=
7399 ssh
->deferred_data_size
= 0L;
7400 ssh
->max_data_size
= parse_blocksize(ssh
->cfg
.ssh_rekey_data
);
7401 ssh
->kex_in_progress
= FALSE
;
7403 p
= connect_to_host(ssh
, host
, port
, realhost
, nodelay
, keepalive
);
7412 static void ssh_free(void *handle
)
7414 Ssh ssh
= (Ssh
) handle
;
7415 struct ssh_channel
*c
;
7416 struct ssh_rportfwd
*pf
;
7418 if (ssh
->v1_cipher_ctx
)
7419 ssh
->cipher
->free_context(ssh
->v1_cipher_ctx
);
7420 if (ssh
->cs_cipher_ctx
)
7421 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
7422 if (ssh
->sc_cipher_ctx
)
7423 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
7424 if (ssh
->cs_mac_ctx
)
7425 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
7426 if (ssh
->sc_mac_ctx
)
7427 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
7428 if (ssh
->cs_comp_ctx
) {
7430 ssh
->cscomp
->compress_cleanup(ssh
->cs_comp_ctx
);
7432 zlib_compress_cleanup(ssh
->cs_comp_ctx
);
7434 if (ssh
->sc_comp_ctx
) {
7436 ssh
->sccomp
->decompress_cleanup(ssh
->sc_comp_ctx
);
7438 zlib_decompress_cleanup(ssh
->sc_comp_ctx
);
7441 dh_cleanup(ssh
->kex_ctx
);
7442 sfree(ssh
->savedhost
);
7444 while (ssh
->queuelen
-- > 0)
7445 ssh_free_packet(ssh
->queue
[ssh
->queuelen
]);
7448 while (ssh
->qhead
) {
7449 struct queued_handler
*qh
= ssh
->qhead
;
7450 ssh
->qhead
= qh
->next
;
7453 ssh
->qhead
= ssh
->qtail
= NULL
;
7455 if (ssh
->channels
) {
7456 while ((c
= delpos234(ssh
->channels
, 0)) != NULL
) {
7459 if (c
->u
.x11
.s
!= NULL
)
7460 x11_close(c
->u
.x11
.s
);
7463 if (c
->u
.pfd
.s
!= NULL
)
7464 pfd_close(c
->u
.pfd
.s
);
7469 freetree234(ssh
->channels
);
7470 ssh
->channels
= NULL
;
7473 if (ssh
->rportfwds
) {
7474 while ((pf
= delpos234(ssh
->rportfwds
, 0)) != NULL
)
7476 freetree234(ssh
->rportfwds
);
7477 ssh
->rportfwds
= NULL
;
7479 sfree(ssh
->deferred_send_data
);
7481 x11_free_auth(ssh
->x11auth
);
7482 sfree(ssh
->do_ssh_init_state
);
7483 sfree(ssh
->do_ssh1_login_state
);
7484 sfree(ssh
->do_ssh2_transport_state
);
7485 sfree(ssh
->do_ssh2_authconn_state
);
7486 if (ssh
->crcda_ctx
) {
7487 crcda_free_context(ssh
->crcda_ctx
);
7488 ssh
->crcda_ctx
= NULL
;
7492 expire_timer_context(ssh
);
7494 pinger_free(ssh
->pinger
);
7501 * Reconfigure the SSH backend.
7503 static void ssh_reconfig(void *handle
, Config
*cfg
)
7505 Ssh ssh
= (Ssh
) handle
;
7506 char *rekeying
= NULL
;
7507 unsigned long old_max_data_size
;
7509 pinger_reconfig(ssh
->pinger
, &ssh
->cfg
, cfg
);
7510 ssh_setup_portfwd(ssh
, cfg
);
7512 if (ssh
->cfg
.ssh_rekey_time
!= cfg
->ssh_rekey_time
&&
7513 cfg
->ssh_rekey_time
!= 0) {
7514 long new_next
= ssh
->last_rekey
+ cfg
->ssh_rekey_time
*60*TICKSPERSEC
;
7515 long now
= GETTICKCOUNT();
7517 if (new_next
- now
< 0) {
7518 rekeying
= "Initiating key re-exchange (timeout shortened)";
7520 ssh
->next_rekey
= schedule_timer(new_next
- now
, ssh2_timer
, ssh
);
7524 old_max_data_size
= ssh
->max_data_size
;
7525 ssh
->max_data_size
= parse_blocksize(cfg
->ssh_rekey_data
);
7526 if (old_max_data_size
!= ssh
->max_data_size
&&
7527 ssh
->max_data_size
!= 0) {
7528 if (ssh
->outgoing_data_size
> ssh
->max_data_size
||
7529 ssh
->incoming_data_size
> ssh
->max_data_size
)
7530 rekeying
= "Initiating key re-exchange (data limit lowered)";
7533 if (rekeying
&& !ssh
->kex_in_progress
) {
7534 do_ssh2_transport(ssh
, rekeying
, -1, NULL
);
7537 ssh
->cfg
= *cfg
; /* STRUCTURE COPY */
7541 * Called to send data down the Telnet connection.
7543 static int ssh_send(void *handle
, char *buf
, int len
)
7545 Ssh ssh
= (Ssh
) handle
;
7547 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
7550 ssh
->protocol(ssh
, (unsigned char *)buf
, len
, 0);
7552 return ssh_sendbuffer(ssh
);
7556 * Called to query the current amount of buffered stdin data.
7558 static int ssh_sendbuffer(void *handle
)
7560 Ssh ssh
= (Ssh
) handle
;
7563 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
7567 * If the SSH socket itself has backed up, add the total backup
7568 * size on that to any individual buffer on the stdin channel.
7571 if (ssh
->throttled_all
)
7572 override_value
= ssh
->overall_bufsize
;
7574 if (ssh
->version
== 1) {
7575 return override_value
;
7576 } else if (ssh
->version
== 2) {
7577 if (!ssh
->mainchan
|| ssh
->mainchan
->closes
> 0)
7578 return override_value
;
7580 return (override_value
+
7581 bufchain_size(&ssh
->mainchan
->v
.v2
.outbuffer
));
7588 * Called to set the size of the window from SSH's POV.
7590 static void ssh_size(void *handle
, int width
, int height
)
7592 Ssh ssh
= (Ssh
) handle
;
7593 struct Packet
*pktout
;
7595 ssh
->term_width
= width
;
7596 ssh
->term_height
= height
;
7598 switch (ssh
->state
) {
7599 case SSH_STATE_BEFORE_SIZE
:
7600 case SSH_STATE_PREPACKET
:
7601 case SSH_STATE_CLOSED
:
7602 break; /* do nothing */
7603 case SSH_STATE_INTERMED
:
7604 ssh
->size_needed
= TRUE
; /* buffer for later */
7606 case SSH_STATE_SESSION
:
7607 if (!ssh
->cfg
.nopty
) {
7608 if (ssh
->version
== 1) {
7609 send_packet(ssh
, SSH1_CMSG_WINDOW_SIZE
,
7610 PKT_INT
, ssh
->term_height
,
7611 PKT_INT
, ssh
->term_width
,
7612 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
7613 } else if (ssh
->mainchan
) {
7614 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7615 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
7616 ssh2_pkt_addstring(pktout
, "window-change");
7617 ssh2_pkt_addbool(pktout
, 0);
7618 ssh2_pkt_adduint32(pktout
, ssh
->term_width
);
7619 ssh2_pkt_adduint32(pktout
, ssh
->term_height
);
7620 ssh2_pkt_adduint32(pktout
, 0);
7621 ssh2_pkt_adduint32(pktout
, 0);
7622 ssh2_pkt_send(ssh
, pktout
);
7630 * Return a list of the special codes that make sense in this
7633 static const struct telnet_special
*ssh_get_specials(void *handle
)
7635 static const struct telnet_special ssh1_ignore_special
[] = {
7636 {"IGNORE message", TS_NOP
}
7638 static const struct telnet_special ssh2_transport_specials
[] = {
7639 {"IGNORE message", TS_NOP
},
7640 {"Repeat key exchange", TS_REKEY
},
7642 static const struct telnet_special ssh2_session_specials
[] = {
7645 /* These are the signal names defined by draft-ietf-secsh-connect-23.
7646 * They include all the ISO C signals, but are a subset of the POSIX
7647 * required signals. */
7648 {"SIGINT (Interrupt)", TS_SIGINT
},
7649 {"SIGTERM (Terminate)", TS_SIGTERM
},
7650 {"SIGKILL (Kill)", TS_SIGKILL
},
7651 {"SIGQUIT (Quit)", TS_SIGQUIT
},
7652 {"SIGHUP (Hangup)", TS_SIGHUP
},
7653 {"More signals", TS_SUBMENU
},
7654 {"SIGABRT", TS_SIGABRT
}, {"SIGALRM", TS_SIGALRM
},
7655 {"SIGFPE", TS_SIGFPE
}, {"SIGILL", TS_SIGILL
},
7656 {"SIGPIPE", TS_SIGPIPE
}, {"SIGSEGV", TS_SIGSEGV
},
7657 {"SIGUSR1", TS_SIGUSR1
}, {"SIGUSR2", TS_SIGUSR2
},
7660 static const struct telnet_special specials_end
[] = {
7663 /* XXX review this length for any changes: */
7664 static struct telnet_special ssh_specials
[lenof(ssh2_transport_specials
) +
7665 lenof(ssh2_session_specials
) +
7666 lenof(specials_end
)];
7667 Ssh ssh
= (Ssh
) handle
;
7669 #define ADD_SPECIALS(name) \
7671 assert((i + lenof(name)) <= lenof(ssh_specials)); \
7672 memcpy(&ssh_specials[i], name, sizeof name); \
7676 if (ssh
->version
== 1) {
7677 /* Don't bother offering IGNORE if we've decided the remote
7678 * won't cope with it, since we wouldn't bother sending it if
7680 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
))
7681 ADD_SPECIALS(ssh1_ignore_special
);
7682 } else if (ssh
->version
== 2) {
7683 ADD_SPECIALS(ssh2_transport_specials
);
7685 ADD_SPECIALS(ssh2_session_specials
);
7686 } /* else we're not ready yet */
7689 ADD_SPECIALS(specials_end
);
7690 return ssh_specials
;
7698 * Send Telnet special codes. TS_EOF is useful for `plink', so you
7699 * can send an EOF and collect resulting output (e.g. `plink
7702 static void ssh_special(void *handle
, Telnet_Special code
)
7704 Ssh ssh
= (Ssh
) handle
;
7705 struct Packet
*pktout
;
7707 if (code
== TS_EOF
) {
7708 if (ssh
->state
!= SSH_STATE_SESSION
) {
7710 * Buffer the EOF in case we are pre-SESSION, so we can
7711 * send it as soon as we reach SESSION.
7714 ssh
->eof_needed
= TRUE
;
7717 if (ssh
->version
== 1) {
7718 send_packet(ssh
, SSH1_CMSG_EOF
, PKT_END
);
7719 } else if (ssh
->mainchan
) {
7720 struct Packet
*pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF
);
7721 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
7722 ssh2_pkt_send(ssh
, pktout
);
7724 logevent("Sent EOF message");
7725 } else if (code
== TS_PING
|| code
== TS_NOP
) {
7726 if (ssh
->state
== SSH_STATE_CLOSED
7727 || ssh
->state
== SSH_STATE_PREPACKET
) return;
7728 if (ssh
->version
== 1) {
7729 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
))
7730 send_packet(ssh
, SSH1_MSG_IGNORE
, PKT_STR
, "", PKT_END
);
7732 pktout
= ssh2_pkt_init(SSH2_MSG_IGNORE
);
7733 ssh2_pkt_addstring_start(pktout
);
7734 ssh2_pkt_send_noqueue(ssh
, pktout
);
7736 } else if (code
== TS_REKEY
) {
7737 if (!ssh
->kex_in_progress
&& ssh
->version
== 2) {
7738 do_ssh2_transport(ssh
, "Initiating key re-exchange at"
7739 " user request", -1, NULL
);
7741 } else if (code
== TS_BRK
) {
7742 if (ssh
->state
== SSH_STATE_CLOSED
7743 || ssh
->state
== SSH_STATE_PREPACKET
) return;
7744 if (ssh
->version
== 1) {
7745 logevent("Unable to send BREAK signal in SSH1");
7746 } else if (ssh
->mainchan
) {
7747 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7748 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
7749 ssh2_pkt_addstring(pktout
, "break");
7750 ssh2_pkt_addbool(pktout
, 0);
7751 ssh2_pkt_adduint32(pktout
, 0); /* default break length */
7752 ssh2_pkt_send(ssh
, pktout
);
7755 /* Is is a POSIX signal? */
7756 char *signame
= NULL
;
7757 if (code
== TS_SIGABRT
) signame
= "ABRT";
7758 if (code
== TS_SIGALRM
) signame
= "ALRM";
7759 if (code
== TS_SIGFPE
) signame
= "FPE";
7760 if (code
== TS_SIGHUP
) signame
= "HUP";
7761 if (code
== TS_SIGILL
) signame
= "ILL";
7762 if (code
== TS_SIGINT
) signame
= "INT";
7763 if (code
== TS_SIGKILL
) signame
= "KILL";
7764 if (code
== TS_SIGPIPE
) signame
= "PIPE";
7765 if (code
== TS_SIGQUIT
) signame
= "QUIT";
7766 if (code
== TS_SIGSEGV
) signame
= "SEGV";
7767 if (code
== TS_SIGTERM
) signame
= "TERM";
7768 if (code
== TS_SIGUSR1
) signame
= "USR1";
7769 if (code
== TS_SIGUSR2
) signame
= "USR2";
7770 /* The SSH-2 protocol does in principle support arbitrary named
7771 * signals, including signame@domain, but we don't support those. */
7773 /* It's a signal. */
7774 if (ssh
->version
== 2 && ssh
->mainchan
) {
7775 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
7776 ssh2_pkt_adduint32(pktout
, ssh
->mainchan
->remoteid
);
7777 ssh2_pkt_addstring(pktout
, "signal");
7778 ssh2_pkt_addbool(pktout
, 0);
7779 ssh2_pkt_addstring(pktout
, signame
);
7780 ssh2_pkt_send(ssh
, pktout
);
7781 logeventf(ssh
, "Sent signal SIG%s", signame
);
7784 /* Never heard of it. Do nothing */
7789 void *new_sock_channel(void *handle
, Socket s
)
7791 Ssh ssh
= (Ssh
) handle
;
7792 struct ssh_channel
*c
;
7793 c
= snew(struct ssh_channel
);
7797 c
->remoteid
= -1; /* to be set when open confirmed */
7798 c
->localid
= alloc_channel_id(ssh
);
7800 c
->type
= CHAN_SOCKDATA_DORMANT
;/* identify channel type */
7802 bufchain_init(&c
->v
.v2
.outbuffer
);
7803 add234(ssh
->channels
, c
);
7809 * This is called when stdout/stderr (the entity to which
7810 * from_backend sends data) manages to clear some backlog.
7812 static void ssh_unthrottle(void *handle
, int bufsize
)
7814 Ssh ssh
= (Ssh
) handle
;
7815 if (ssh
->version
== 1) {
7816 if (ssh
->v1_stdout_throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
7817 ssh
->v1_stdout_throttling
= 0;
7818 ssh1_throttle(ssh
, -1);
7821 if (ssh
->mainchan
&& ssh
->mainchan
->closes
== 0)
7822 ssh2_set_window(ssh
->mainchan
, OUR_V2_WINSIZE
- bufsize
);
7826 void ssh_send_port_open(void *channel
, char *hostname
, int port
, char *org
)
7828 struct ssh_channel
*c
= (struct ssh_channel
*)channel
;
7830 struct Packet
*pktout
;
7832 logeventf(ssh
, "Opening forwarded connection to %s:%d", hostname
, port
);
7834 if (ssh
->version
== 1) {
7835 send_packet(ssh
, SSH1_MSG_PORT_OPEN
,
7836 PKT_INT
, c
->localid
,
7839 /* PKT_STR, <org:orgport>, */
7842 pktout
= ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
7843 ssh2_pkt_addstring(pktout
, "direct-tcpip");
7844 ssh2_pkt_adduint32(pktout
, c
->localid
);
7845 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
7846 ssh2_pkt_adduint32(pktout
, c
->v
.v2
.locwindow
);/* our window size */
7847 ssh2_pkt_adduint32(pktout
, 0x4000UL
); /* our max pkt size */
7848 ssh2_pkt_addstring(pktout
, hostname
);
7849 ssh2_pkt_adduint32(pktout
, port
);
7851 * We make up values for the originator data; partly it's
7852 * too much hassle to keep track, and partly I'm not
7853 * convinced the server should be told details like that
7854 * about my local network configuration.
7856 ssh2_pkt_addstring(pktout
, "client-side-connection");
7857 ssh2_pkt_adduint32(pktout
, 0);
7858 ssh2_pkt_send(ssh
, pktout
);
7862 static Socket
ssh_socket(void *handle
)
7864 Ssh ssh
= (Ssh
) handle
;
7868 static int ssh_sendok(void *handle
)
7870 Ssh ssh
= (Ssh
) handle
;
7871 return ssh
->send_ok
;
7874 static int ssh_ldisc(void *handle
, int option
)
7876 Ssh ssh
= (Ssh
) handle
;
7877 if (option
== LD_ECHO
)
7878 return ssh
->echoing
;
7879 if (option
== LD_EDIT
)
7880 return ssh
->editing
;
7884 static void ssh_provide_ldisc(void *handle
, void *ldisc
)
7886 Ssh ssh
= (Ssh
) handle
;
7890 static void ssh_provide_logctx(void *handle
, void *logctx
)
7892 Ssh ssh
= (Ssh
) handle
;
7893 ssh
->logctx
= logctx
;
7896 static int ssh_return_exitcode(void *handle
)
7898 Ssh ssh
= (Ssh
) handle
;
7902 return (ssh
->exitcode
>= 0 ? ssh
->exitcode
: 0);
7906 * cfg_info for SSH is the currently running version of the
7907 * protocol. (1 for 1; 2 for 2; 0 for not-decided-yet.)
7909 static int ssh_cfg_info(void *handle
)
7911 Ssh ssh
= (Ssh
) handle
;
7912 return ssh
->version
;
7916 * Gross hack: pscp will try to start SFTP but fall back to scp1 if
7917 * that fails. This variable is the means by which scp.c can reach
7918 * into the SSH code and find out which one it got.
7920 extern int ssh_fallback_cmd(void *handle
)
7922 Ssh ssh
= (Ssh
) handle
;
7923 return ssh
->fallback_cmd
;
7926 Backend ssh_backend
= {
7936 ssh_return_exitcode
,