18 #define logevent(s) { logevent(s); \
19 if ((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)) \
20 { fprintf(stderr, "%s\n", s); fflush(stderr); } }
22 /* logevent, only printf-formatted. */
23 void logeventf(char *fmt
, ...)
29 vsprintf(stuff
, fmt
, ap
);
34 #define bombout(msg) ( ssh->state = SSH_STATE_CLOSED, \
35 (ssh->s ? sk_close(ssh->s), ssh->s = NULL : 0), \
36 logeventf msg, connection_fatal msg )
38 #define SSH1_MSG_DISCONNECT 1 /* 0x1 */
39 #define SSH1_SMSG_PUBLIC_KEY 2 /* 0x2 */
40 #define SSH1_CMSG_SESSION_KEY 3 /* 0x3 */
41 #define SSH1_CMSG_USER 4 /* 0x4 */
42 #define SSH1_CMSG_AUTH_RSA 6 /* 0x6 */
43 #define SSH1_SMSG_AUTH_RSA_CHALLENGE 7 /* 0x7 */
44 #define SSH1_CMSG_AUTH_RSA_RESPONSE 8 /* 0x8 */
45 #define SSH1_CMSG_AUTH_PASSWORD 9 /* 0x9 */
46 #define SSH1_CMSG_REQUEST_PTY 10 /* 0xa */
47 #define SSH1_CMSG_WINDOW_SIZE 11 /* 0xb */
48 #define SSH1_CMSG_EXEC_SHELL 12 /* 0xc */
49 #define SSH1_CMSG_EXEC_CMD 13 /* 0xd */
50 #define SSH1_SMSG_SUCCESS 14 /* 0xe */
51 #define SSH1_SMSG_FAILURE 15 /* 0xf */
52 #define SSH1_CMSG_STDIN_DATA 16 /* 0x10 */
53 #define SSH1_SMSG_STDOUT_DATA 17 /* 0x11 */
54 #define SSH1_SMSG_STDERR_DATA 18 /* 0x12 */
55 #define SSH1_CMSG_EOF 19 /* 0x13 */
56 #define SSH1_SMSG_EXIT_STATUS 20 /* 0x14 */
57 #define SSH1_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* 0x15 */
58 #define SSH1_MSG_CHANNEL_OPEN_FAILURE 22 /* 0x16 */
59 #define SSH1_MSG_CHANNEL_DATA 23 /* 0x17 */
60 #define SSH1_MSG_CHANNEL_CLOSE 24 /* 0x18 */
61 #define SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* 0x19 */
62 #define SSH1_SMSG_X11_OPEN 27 /* 0x1b */
63 #define SSH1_CMSG_PORT_FORWARD_REQUEST 28 /* 0x1c */
64 #define SSH1_MSG_PORT_OPEN 29 /* 0x1d */
65 #define SSH1_CMSG_AGENT_REQUEST_FORWARDING 30 /* 0x1e */
66 #define SSH1_SMSG_AGENT_OPEN 31 /* 0x1f */
67 #define SSH1_MSG_IGNORE 32 /* 0x20 */
68 #define SSH1_CMSG_EXIT_CONFIRMATION 33 /* 0x21 */
69 #define SSH1_CMSG_X11_REQUEST_FORWARDING 34 /* 0x22 */
70 #define SSH1_CMSG_AUTH_RHOSTS_RSA 35 /* 0x23 */
71 #define SSH1_MSG_DEBUG 36 /* 0x24 */
72 #define SSH1_CMSG_REQUEST_COMPRESSION 37 /* 0x25 */
73 #define SSH1_CMSG_AUTH_TIS 39 /* 0x27 */
74 #define SSH1_SMSG_AUTH_TIS_CHALLENGE 40 /* 0x28 */
75 #define SSH1_CMSG_AUTH_TIS_RESPONSE 41 /* 0x29 */
76 #define SSH1_CMSG_AUTH_CCARD 70 /* 0x46 */
77 #define SSH1_SMSG_AUTH_CCARD_CHALLENGE 71 /* 0x47 */
78 #define SSH1_CMSG_AUTH_CCARD_RESPONSE 72 /* 0x48 */
80 #define SSH1_AUTH_TIS 5 /* 0x5 */
81 #define SSH1_AUTH_CCARD 16 /* 0x10 */
83 #define SSH1_PROTOFLAG_SCREEN_NUMBER 1 /* 0x1 */
84 /* Mask for protoflags we will echo back to server if seen */
85 #define SSH1_PROTOFLAGS_SUPPORTED 0 /* 0x1 */
87 #define SSH2_MSG_DISCONNECT 1 /* 0x1 */
88 #define SSH2_MSG_IGNORE 2 /* 0x2 */
89 #define SSH2_MSG_UNIMPLEMENTED 3 /* 0x3 */
90 #define SSH2_MSG_DEBUG 4 /* 0x4 */
91 #define SSH2_MSG_SERVICE_REQUEST 5 /* 0x5 */
92 #define SSH2_MSG_SERVICE_ACCEPT 6 /* 0x6 */
93 #define SSH2_MSG_KEXINIT 20 /* 0x14 */
94 #define SSH2_MSG_NEWKEYS 21 /* 0x15 */
95 #define SSH2_MSG_KEXDH_INIT 30 /* 0x1e */
96 #define SSH2_MSG_KEXDH_REPLY 31 /* 0x1f */
97 #define SSH2_MSG_KEX_DH_GEX_REQUEST 30 /* 0x1e */
98 #define SSH2_MSG_KEX_DH_GEX_GROUP 31 /* 0x1f */
99 #define SSH2_MSG_KEX_DH_GEX_INIT 32 /* 0x20 */
100 #define SSH2_MSG_KEX_DH_GEX_REPLY 33 /* 0x21 */
101 #define SSH2_MSG_USERAUTH_REQUEST 50 /* 0x32 */
102 #define SSH2_MSG_USERAUTH_FAILURE 51 /* 0x33 */
103 #define SSH2_MSG_USERAUTH_SUCCESS 52 /* 0x34 */
104 #define SSH2_MSG_USERAUTH_BANNER 53 /* 0x35 */
105 #define SSH2_MSG_USERAUTH_PK_OK 60 /* 0x3c */
106 #define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ 60 /* 0x3c */
107 #define SSH2_MSG_USERAUTH_INFO_REQUEST 60 /* 0x3c */
108 #define SSH2_MSG_USERAUTH_INFO_RESPONSE 61 /* 0x3d */
109 #define SSH2_MSG_GLOBAL_REQUEST 80 /* 0x50 */
110 #define SSH2_MSG_REQUEST_SUCCESS 81 /* 0x51 */
111 #define SSH2_MSG_REQUEST_FAILURE 82 /* 0x52 */
112 #define SSH2_MSG_CHANNEL_OPEN 90 /* 0x5a */
113 #define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION 91 /* 0x5b */
114 #define SSH2_MSG_CHANNEL_OPEN_FAILURE 92 /* 0x5c */
115 #define SSH2_MSG_CHANNEL_WINDOW_ADJUST 93 /* 0x5d */
116 #define SSH2_MSG_CHANNEL_DATA 94 /* 0x5e */
117 #define SSH2_MSG_CHANNEL_EXTENDED_DATA 95 /* 0x5f */
118 #define SSH2_MSG_CHANNEL_EOF 96 /* 0x60 */
119 #define SSH2_MSG_CHANNEL_CLOSE 97 /* 0x61 */
120 #define SSH2_MSG_CHANNEL_REQUEST 98 /* 0x62 */
121 #define SSH2_MSG_CHANNEL_SUCCESS 99 /* 0x63 */
122 #define SSH2_MSG_CHANNEL_FAILURE 100 /* 0x64 */
125 * Packet type contexts, so that ssh2_pkt_type can correctly decode
126 * the ambiguous type numbers back into the correct type strings.
128 #define SSH2_PKTCTX_DHGROUP1 0x0001
129 #define SSH2_PKTCTX_DHGEX 0x0002
130 #define SSH2_PKTCTX_PUBLICKEY 0x0010
131 #define SSH2_PKTCTX_PASSWORD 0x0020
132 #define SSH2_PKTCTX_KBDINTER 0x0040
133 #define SSH2_PKTCTX_AUTH_MASK 0x00F0
135 #define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT 1 /* 0x1 */
136 #define SSH2_DISCONNECT_PROTOCOL_ERROR 2 /* 0x2 */
137 #define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED 3 /* 0x3 */
138 #define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED 4 /* 0x4 */
139 #define SSH2_DISCONNECT_MAC_ERROR 5 /* 0x5 */
140 #define SSH2_DISCONNECT_COMPRESSION_ERROR 6 /* 0x6 */
141 #define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE 7 /* 0x7 */
142 #define SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED 8 /* 0x8 */
143 #define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE 9 /* 0x9 */
144 #define SSH2_DISCONNECT_CONNECTION_LOST 10 /* 0xa */
145 #define SSH2_DISCONNECT_BY_APPLICATION 11 /* 0xb */
146 #define SSH2_DISCONNECT_TOO_MANY_CONNECTIONS 12 /* 0xc */
147 #define SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER 13 /* 0xd */
148 #define SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE 14 /* 0xe */
149 #define SSH2_DISCONNECT_ILLEGAL_USER_NAME 15 /* 0xf */
151 static const char *const ssh2_disconnect_reasons
[] = {
153 "SSH_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT",
154 "SSH_DISCONNECT_PROTOCOL_ERROR",
155 "SSH_DISCONNECT_KEY_EXCHANGE_FAILED",
156 "SSH_DISCONNECT_HOST_AUTHENTICATION_FAILED",
157 "SSH_DISCONNECT_MAC_ERROR",
158 "SSH_DISCONNECT_COMPRESSION_ERROR",
159 "SSH_DISCONNECT_SERVICE_NOT_AVAILABLE",
160 "SSH_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED",
161 "SSH_DISCONNECT_HOST_KEY_NOT_VERIFIABLE",
162 "SSH_DISCONNECT_CONNECTION_LOST",
163 "SSH_DISCONNECT_BY_APPLICATION",
164 "SSH_DISCONNECT_TOO_MANY_CONNECTIONS",
165 "SSH_DISCONNECT_AUTH_CANCELLED_BY_USER",
166 "SSH_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE",
167 "SSH_DISCONNECT_ILLEGAL_USER_NAME",
170 #define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1 /* 0x1 */
171 #define SSH2_OPEN_CONNECT_FAILED 2 /* 0x2 */
172 #define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3 /* 0x3 */
173 #define SSH2_OPEN_RESOURCE_SHORTAGE 4 /* 0x4 */
175 #define SSH2_EXTENDED_DATA_STDERR 1 /* 0x1 */
178 * Various remote-bug flags.
180 #define BUG_CHOKES_ON_SSH1_IGNORE 1
181 #define BUG_SSH2_HMAC 2
182 #define BUG_NEEDS_SSH1_PLAIN_PASSWORD 4
183 #define BUG_CHOKES_ON_RSA 8
184 #define BUG_SSH2_RSA_PADDING 16
185 #define BUG_SSH2_DERIVEKEY 32
186 #define BUG_SSH2_DH_GEX 64
188 #define translate(x) if (type == x) return #x
189 #define translatec(x,ctx) if (type == x && (pkt_ctx & ctx)) return #x
190 char *ssh1_pkt_type(int type
)
192 translate(SSH1_MSG_DISCONNECT
);
193 translate(SSH1_SMSG_PUBLIC_KEY
);
194 translate(SSH1_CMSG_SESSION_KEY
);
195 translate(SSH1_CMSG_USER
);
196 translate(SSH1_CMSG_AUTH_RSA
);
197 translate(SSH1_SMSG_AUTH_RSA_CHALLENGE
);
198 translate(SSH1_CMSG_AUTH_RSA_RESPONSE
);
199 translate(SSH1_CMSG_AUTH_PASSWORD
);
200 translate(SSH1_CMSG_REQUEST_PTY
);
201 translate(SSH1_CMSG_WINDOW_SIZE
);
202 translate(SSH1_CMSG_EXEC_SHELL
);
203 translate(SSH1_CMSG_EXEC_CMD
);
204 translate(SSH1_SMSG_SUCCESS
);
205 translate(SSH1_SMSG_FAILURE
);
206 translate(SSH1_CMSG_STDIN_DATA
);
207 translate(SSH1_SMSG_STDOUT_DATA
);
208 translate(SSH1_SMSG_STDERR_DATA
);
209 translate(SSH1_CMSG_EOF
);
210 translate(SSH1_SMSG_EXIT_STATUS
);
211 translate(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
);
212 translate(SSH1_MSG_CHANNEL_OPEN_FAILURE
);
213 translate(SSH1_MSG_CHANNEL_DATA
);
214 translate(SSH1_MSG_CHANNEL_CLOSE
);
215 translate(SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
);
216 translate(SSH1_SMSG_X11_OPEN
);
217 translate(SSH1_CMSG_PORT_FORWARD_REQUEST
);
218 translate(SSH1_MSG_PORT_OPEN
);
219 translate(SSH1_CMSG_AGENT_REQUEST_FORWARDING
);
220 translate(SSH1_SMSG_AGENT_OPEN
);
221 translate(SSH1_MSG_IGNORE
);
222 translate(SSH1_CMSG_EXIT_CONFIRMATION
);
223 translate(SSH1_CMSG_X11_REQUEST_FORWARDING
);
224 translate(SSH1_CMSG_AUTH_RHOSTS_RSA
);
225 translate(SSH1_MSG_DEBUG
);
226 translate(SSH1_CMSG_REQUEST_COMPRESSION
);
227 translate(SSH1_CMSG_AUTH_TIS
);
228 translate(SSH1_SMSG_AUTH_TIS_CHALLENGE
);
229 translate(SSH1_CMSG_AUTH_TIS_RESPONSE
);
230 translate(SSH1_CMSG_AUTH_CCARD
);
231 translate(SSH1_SMSG_AUTH_CCARD_CHALLENGE
);
232 translate(SSH1_CMSG_AUTH_CCARD_RESPONSE
);
235 char *ssh2_pkt_type(int pkt_ctx
, int type
)
237 translate(SSH2_MSG_DISCONNECT
);
238 translate(SSH2_MSG_IGNORE
);
239 translate(SSH2_MSG_UNIMPLEMENTED
);
240 translate(SSH2_MSG_DEBUG
);
241 translate(SSH2_MSG_SERVICE_REQUEST
);
242 translate(SSH2_MSG_SERVICE_ACCEPT
);
243 translate(SSH2_MSG_KEXINIT
);
244 translate(SSH2_MSG_NEWKEYS
);
245 translatec(SSH2_MSG_KEXDH_INIT
, SSH2_PKTCTX_DHGROUP1
);
246 translatec(SSH2_MSG_KEXDH_REPLY
, SSH2_PKTCTX_DHGROUP1
);
247 translatec(SSH2_MSG_KEX_DH_GEX_REQUEST
, SSH2_PKTCTX_DHGEX
);
248 translatec(SSH2_MSG_KEX_DH_GEX_GROUP
, SSH2_PKTCTX_DHGEX
);
249 translatec(SSH2_MSG_KEX_DH_GEX_INIT
, SSH2_PKTCTX_DHGEX
);
250 translatec(SSH2_MSG_KEX_DH_GEX_REPLY
, SSH2_PKTCTX_DHGEX
);
251 translate(SSH2_MSG_USERAUTH_REQUEST
);
252 translate(SSH2_MSG_USERAUTH_FAILURE
);
253 translate(SSH2_MSG_USERAUTH_SUCCESS
);
254 translate(SSH2_MSG_USERAUTH_BANNER
);
255 translatec(SSH2_MSG_USERAUTH_PK_OK
, SSH2_PKTCTX_PUBLICKEY
);
256 translatec(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ
, SSH2_PKTCTX_PASSWORD
);
257 translatec(SSH2_MSG_USERAUTH_INFO_REQUEST
, SSH2_PKTCTX_KBDINTER
);
258 translatec(SSH2_MSG_USERAUTH_INFO_RESPONSE
, SSH2_PKTCTX_KBDINTER
);
259 translate(SSH2_MSG_GLOBAL_REQUEST
);
260 translate(SSH2_MSG_REQUEST_SUCCESS
);
261 translate(SSH2_MSG_REQUEST_FAILURE
);
262 translate(SSH2_MSG_CHANNEL_OPEN
);
263 translate(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
);
264 translate(SSH2_MSG_CHANNEL_OPEN_FAILURE
);
265 translate(SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
266 translate(SSH2_MSG_CHANNEL_DATA
);
267 translate(SSH2_MSG_CHANNEL_EXTENDED_DATA
);
268 translate(SSH2_MSG_CHANNEL_EOF
);
269 translate(SSH2_MSG_CHANNEL_CLOSE
);
270 translate(SSH2_MSG_CHANNEL_REQUEST
);
271 translate(SSH2_MSG_CHANNEL_SUCCESS
);
272 translate(SSH2_MSG_CHANNEL_FAILURE
);
278 #define GET_32BIT(cp) \
279 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
280 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
281 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
282 ((unsigned long)(unsigned char)(cp)[3]))
284 #define PUT_32BIT(cp, value) { \
285 (cp)[0] = (unsigned char)((value) >> 24); \
286 (cp)[1] = (unsigned char)((value) >> 16); \
287 (cp)[2] = (unsigned char)((value) >> 8); \
288 (cp)[3] = (unsigned char)(value); }
290 enum { PKT_END
, PKT_INT
, PKT_CHAR
, PKT_DATA
, PKT_STR
, PKT_BIGNUM
};
292 /* Coroutine mechanics for the sillier bits of the code */
293 #define crBegin(v) { int *crLine = &v; switch(v) { case 0:;
296 if (!ssh->t) ssh->t = smalloc(sizeof(struct t)); \
298 #define crFinish(z) } *crLine = 0; return (z); }
299 #define crFinishV } *crLine = 0; return; }
300 #define crReturn(z) \
302 *crLine =__LINE__; return (z); case __LINE__:;\
306 *crLine=__LINE__; return; case __LINE__:;\
308 #define crStop(z) do{ *crLine = 0; return (z); }while(0)
309 #define crStopV do{ *crLine = 0; return; }while(0)
310 #define crWaitUntil(c) do { crReturn(0); } while (!(c))
311 #define crWaitUntilV(c) do { crReturnV; } while (!(c))
313 typedef struct ssh_tag
*Ssh
;
315 extern char *x11_init(Socket
*, char *, void *);
316 extern void x11_close(Socket
);
317 extern int x11_send(Socket
, char *, int);
318 extern void x11_invent_auth(char *, int, char *, int);
319 extern void x11_unthrottle(Socket s
);
320 extern void x11_override_throttle(Socket s
, int enable
);
322 extern char *pfd_newconnect(Socket
* s
, char *hostname
, int port
, void *c
);
323 extern char *pfd_addforward(char *desthost
, int destport
, int port
);
324 extern void pfd_close(Socket s
);
325 extern int pfd_send(Socket s
, char *data
, int len
);
326 extern void pfd_confirm(Socket s
);
327 extern void pfd_unthrottle(Socket s
);
328 extern void pfd_override_throttle(Socket s
, int enable
);
330 static void ssh2_pkt_init(Ssh
, int pkt_type
);
331 static void ssh2_pkt_addbool(Ssh
, unsigned char value
);
332 static void ssh2_pkt_adduint32(Ssh
, unsigned long value
);
333 static void ssh2_pkt_addstring_start(Ssh
);
334 static void ssh2_pkt_addstring_str(Ssh
, char *data
);
335 static void ssh2_pkt_addstring_data(Ssh
, char *data
, int len
);
336 static void ssh2_pkt_addstring(Ssh
, char *data
);
337 static char *ssh2_mpint_fmt(Bignum b
, int *len
);
338 static void ssh2_pkt_addmp(Ssh
, Bignum b
);
339 static int ssh2_pkt_construct(Ssh
);
340 static void ssh2_pkt_send(Ssh
);
343 * Buffer management constants. There are several of these for
344 * various different purposes:
346 * - SSH1_BUFFER_LIMIT is the amount of backlog that must build up
347 * on a local data stream before we throttle the whole SSH
348 * connection (in SSH1 only). Throttling the whole connection is
349 * pretty drastic so we set this high in the hope it won't
352 * - SSH_MAX_BACKLOG is the amount of backlog that must build up
353 * on the SSH connection itself before we defensively throttle
354 * _all_ local data streams. This is pretty drastic too (though
355 * thankfully unlikely in SSH2 since the window mechanism should
356 * ensure that the server never has any need to throttle its end
357 * of the connection), so we set this high as well.
359 * - OUR_V2_WINSIZE is the maximum window size we present on SSH2
363 #define SSH1_BUFFER_LIMIT 32768
364 #define SSH_MAX_BACKLOG 32768
365 #define OUR_V2_WINSIZE 16384
367 const static struct ssh_kex
*kex_algs
[] = {
368 &ssh_diffiehellman_gex
,
372 const static struct ssh_signkey
*hostkey_algs
[] = { &ssh_rsa
, &ssh_dss
};
374 static void *nullmac_make_context(void)
378 static void nullmac_free_context(void *handle
)
381 static void nullmac_key(void *handle
, unsigned char *key
)
384 static void nullmac_generate(void *handle
, unsigned char *blk
, int len
,
388 static int nullmac_verify(void *handle
, unsigned char *blk
, int len
,
393 const static struct ssh_mac ssh_mac_none
= {
394 nullmac_make_context
, nullmac_free_context
, nullmac_key
,
395 nullmac_generate
, nullmac_verify
, "none", 0
397 const static struct ssh_mac
*macs
[] = {
398 &ssh_sha1
, &ssh_md5
, &ssh_mac_none
400 const static struct ssh_mac
*buggymacs
[] = {
401 &ssh_sha1_buggy
, &ssh_md5
, &ssh_mac_none
404 static void ssh_comp_none_init(void)
407 static int ssh_comp_none_block(unsigned char *block
, int len
,
408 unsigned char **outblock
, int *outlen
)
412 static int ssh_comp_none_disable(void)
416 const static struct ssh_compress ssh_comp_none
= {
418 ssh_comp_none_init
, ssh_comp_none_block
,
419 ssh_comp_none_init
, ssh_comp_none_block
,
420 ssh_comp_none_disable
422 extern const struct ssh_compress ssh_zlib
;
423 const static struct ssh_compress
*compressions
[] = {
424 &ssh_zlib
, &ssh_comp_none
427 enum { /* channel types */
432 CHAN_SOCKDATA_DORMANT
/* one the remote hasn't confirmed */
436 * 2-3-4 tree storing channels.
439 Ssh ssh
; /* pointer back to main context */
440 unsigned remoteid
, localid
;
443 * In SSH1, this value contains four bits:
445 * 1 We have sent SSH1_MSG_CHANNEL_CLOSE.
446 * 2 We have sent SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION.
447 * 4 We have received SSH1_MSG_CHANNEL_CLOSE.
448 * 8 We have received SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION.
450 * A channel is completely finished with when all four bits are set.
454 struct ssh1_data_channel
{
457 struct ssh2_data_channel
{
459 unsigned remwindow
, remmaxpkt
;
464 struct ssh_agent_channel
{
465 unsigned char *message
;
466 unsigned char msglen
[4];
467 int lensofar
, totallen
;
469 struct ssh_x11_channel
{
472 struct ssh_pfd_channel
{
479 * 2-3-4 tree storing remote->local port forwardings. SSH 1 and SSH
480 * 2 use this structure in different ways, reflecting SSH 2's
481 * altogether saner approach to port forwarding.
483 * In SSH 1, you arrange a remote forwarding by sending the server
484 * the remote port number, and the local destination host:port.
485 * When a connection comes in, the server sends you back that
486 * host:port pair, and you connect to it. This is a ready-made
487 * security hole if you're not on the ball: a malicious server
488 * could send you back _any_ host:port pair, so if you trustingly
489 * connect to the address it gives you then you've just opened the
490 * entire inside of your corporate network just by connecting
491 * through it to a dodgy SSH server. Hence, we must store a list of
492 * host:port pairs we _are_ trying to forward to, and reject a
493 * connection request from the server if it's not in the list.
495 * In SSH 2, each side of the connection minds its own business and
496 * doesn't send unnecessary information to the other. You arrange a
497 * remote forwarding by sending the server just the remote port
498 * number. When a connection comes in, the server tells you which
499 * of its ports was connected to; and _you_ have to remember what
500 * local host:port pair went with that port number.
502 * Hence: in SSH 1 this structure stores host:port pairs we intend
503 * to allow connections to, and is indexed by those host:port
504 * pairs. In SSH 2 it stores a mapping from source port to
505 * destination host:port pair, and is indexed by source port.
507 struct ssh_rportfwd
{
508 unsigned sport
, dport
;
521 static void ssh1_protocol(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
);
522 static void ssh2_protocol(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
);
523 static void ssh_size(void *handle
, int width
, int height
);
524 static void ssh_special(void *handle
, Telnet_Special
);
525 static int ssh2_try_send(struct ssh_channel
*c
);
526 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
, int len
);
527 static void ssh_throttle_all(Ssh ssh
, int enable
, int bufsize
);
528 static void ssh2_set_window(struct ssh_channel
*c
, unsigned newwin
);
529 static int ssh_sendbuffer(void *handle
);
531 struct rdpkt1_state_tag
{
532 long len
, pad
, biglen
, to_read
;
533 unsigned long realcrc
, gotcrc
;
539 struct rdpkt2_state_tag
{
540 long len
, pad
, payload
, packetlen
, maclen
;
543 unsigned long incoming_sequence
;
547 const struct plug_function_table
*fn
;
548 /* the above field _must_ be first in the structure */
550 SHA_State exhash
, exhashbase
;
554 unsigned char session_key
[32];
556 int v1_remote_protoflags
;
557 int v1_local_protoflags
;
558 int agentfwd_enabled
;
561 const struct ssh_cipher
*cipher
;
563 const struct ssh2_cipher
*cscipher
, *sccipher
;
564 void *cs_cipher_ctx
, *sc_cipher_ctx
;
565 const struct ssh_mac
*csmac
, *scmac
;
566 void *cs_mac_ctx
, *sc_mac_ctx
;
567 const struct ssh_compress
*cscomp
, *sccomp
;
568 const struct ssh_kex
*kex
;
569 const struct ssh_signkey
*hostkey
;
570 unsigned char v2_session_id
[20];
575 int echoing
, editing
;
579 int term_width
, term_height
;
581 tree234
*channels
; /* indexed by local id */
582 struct ssh_channel
*mainchan
; /* primary session channel */
589 SSH_STATE_BEFORE_SIZE
,
595 int size_needed
, eof_needed
;
598 struct Packet pktout
;
599 unsigned char *deferred_send_data
;
600 int deferred_len
, deferred_size
;
603 * Gross hack: pscp will try to start SFTP but fall back to
604 * scp1 if that fails. This variable is the means by which
605 * scp.c can reach into the SSH code and find out which one it
611 * Used for username and password input.
613 char *userpass_input_buffer
;
614 int userpass_input_buflen
;
615 int userpass_input_bufpos
;
616 int userpass_input_echo
;
618 char *portfwd_strptr
;
622 int v1_throttle_count
;
625 int v1_stdout_throttling
;
626 int v2_outgoing_sequence
;
628 int ssh1_rdpkt_crstate
;
629 int ssh2_rdpkt_crstate
;
630 int do_ssh_init_crstate
;
631 int ssh_gotdata_crstate
;
632 int ssh1_protocol_crstate
;
633 int do_ssh1_login_crstate
;
634 int do_ssh2_transport_crstate
;
635 int do_ssh2_authconn_crstate
;
637 void *do_ssh_init_state
;
638 void *do_ssh1_login_state
;
639 void *do_ssh2_transport_state
;
640 void *do_ssh2_authconn_state
;
642 struct rdpkt1_state_tag rdpkt1_state
;
643 struct rdpkt2_state_tag rdpkt2_state
;
645 void (*protocol
) (Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
);
646 int (*s_rdpkt
) (Ssh ssh
, unsigned char **data
, int *datalen
);
649 static int ssh_channelcmp(void *av
, void *bv
)
651 struct ssh_channel
*a
= (struct ssh_channel
*) av
;
652 struct ssh_channel
*b
= (struct ssh_channel
*) bv
;
653 if (a
->localid
< b
->localid
)
655 if (a
->localid
> b
->localid
)
659 static int ssh_channelfind(void *av
, void *bv
)
661 unsigned *a
= (unsigned *) av
;
662 struct ssh_channel
*b
= (struct ssh_channel
*) bv
;
670 static int ssh_rportcmp_ssh1(void *av
, void *bv
)
672 struct ssh_rportfwd
*a
= (struct ssh_rportfwd
*) av
;
673 struct ssh_rportfwd
*b
= (struct ssh_rportfwd
*) bv
;
675 if ( (i
= strcmp(a
->dhost
, b
->dhost
)) != 0)
676 return i
< 0 ?
-1 : +1;
677 if (a
->dport
> b
->dport
)
679 if (a
->dport
< b
->dport
)
684 static int ssh_rportcmp_ssh2(void *av
, void *bv
)
686 struct ssh_rportfwd
*a
= (struct ssh_rportfwd
*) av
;
687 struct ssh_rportfwd
*b
= (struct ssh_rportfwd
*) bv
;
689 if (a
->sport
> b
->sport
)
691 if (a
->sport
< b
->sport
)
696 static int alloc_channel_id(Ssh ssh
)
698 const unsigned CHANNEL_NUMBER_OFFSET
= 256;
699 unsigned low
, high
, mid
;
701 struct ssh_channel
*c
;
704 * First-fit allocation of channel numbers: always pick the
705 * lowest unused one. To do this, binary-search using the
706 * counted B-tree to find the largest channel ID which is in a
707 * contiguous sequence from the beginning. (Precisely
708 * everything in that sequence must have ID equal to its tree
709 * index plus CHANNEL_NUMBER_OFFSET.)
711 tsize
= count234(ssh
->channels
);
715 while (high
- low
> 1) {
716 mid
= (high
+ low
) / 2;
717 c
= index234(ssh
->channels
, mid
);
718 if (c
->localid
== mid
+ CHANNEL_NUMBER_OFFSET
)
719 low
= mid
; /* this one is fine */
721 high
= mid
; /* this one is past it */
724 * Now low points to either -1, or the tree index of the
725 * largest ID in the initial sequence.
728 unsigned i
= low
+ 1 + CHANNEL_NUMBER_OFFSET
;
729 assert(NULL
== find234(ssh
->channels
, &i
, ssh_channelfind
));
731 return low
+ 1 + CHANNEL_NUMBER_OFFSET
;
734 static void c_write(Ssh ssh
, char *buf
, int len
)
736 if ((flags
& FLAG_STDERR
)) {
738 for (i
= 0; i
< len
; i
++)
740 fputc(buf
[i
], stderr
);
743 from_backend(ssh
->frontend
, 1, buf
, len
);
746 static void c_write_untrusted(Ssh ssh
, char *buf
, int len
)
749 for (i
= 0; i
< len
; i
++) {
751 c_write(ssh
, "\r\n", 2);
752 else if ((buf
[i
] & 0x60) || (buf
[i
] == '\r'))
753 c_write(ssh
, buf
+ i
, 1);
757 static void c_write_str(Ssh ssh
, char *buf
)
759 c_write(ssh
, buf
, strlen(buf
));
763 * Collect incoming data in the incoming packet buffer.
764 * Decipher and verify the packet when it is completely read.
765 * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets.
766 * Update the *data and *datalen variables.
767 * Return the additional nr of bytes needed, or 0 when
768 * a complete packet is available.
770 static int ssh1_rdpkt(Ssh ssh
, unsigned char **data
, int *datalen
)
772 struct rdpkt1_state_tag
*st
= &ssh
->rdpkt1_state
;
774 crBegin(ssh
->ssh1_rdpkt_crstate
);
779 ssh
->pktin
.length
= 0;
781 for (st
->i
= st
->len
= 0; st
->i
< 4; st
->i
++) {
782 while ((*datalen
) == 0)
784 st
->len
= (st
->len
<< 8) + **data
;
785 (*data
)++, (*datalen
)--;
788 st
->pad
= 8 - (st
->len
% 8);
789 st
->biglen
= st
->len
+ st
->pad
;
790 ssh
->pktin
.length
= st
->len
- 5;
792 if (ssh
->pktin
.maxlen
< st
->biglen
) {
793 ssh
->pktin
.maxlen
= st
->biglen
;
794 ssh
->pktin
.data
= srealloc(ssh
->pktin
.data
, st
->biglen
+ APIEXTRA
);
797 st
->to_read
= st
->biglen
;
798 st
->p
= ssh
->pktin
.data
;
799 while (st
->to_read
> 0) {
800 st
->chunk
= st
->to_read
;
801 while ((*datalen
) == 0)
802 crReturn(st
->to_read
);
803 if (st
->chunk
> (*datalen
))
804 st
->chunk
= (*datalen
);
805 memcpy(st
->p
, *data
, st
->chunk
);
807 *datalen
-= st
->chunk
;
809 st
->to_read
-= st
->chunk
;
812 if (ssh
->cipher
&& detect_attack(ssh
->pktin
.data
, st
->biglen
, NULL
)) {
813 bombout(("Network attack (CRC compensation) detected!"));
818 ssh
->cipher
->decrypt(ssh
->v1_cipher_ctx
, ssh
->pktin
.data
, st
->biglen
);
820 st
->realcrc
= crc32(ssh
->pktin
.data
, st
->biglen
- 4);
821 st
->gotcrc
= GET_32BIT(ssh
->pktin
.data
+ st
->biglen
- 4);
822 if (st
->gotcrc
!= st
->realcrc
) {
823 bombout(("Incorrect CRC received on packet"));
827 ssh
->pktin
.body
= ssh
->pktin
.data
+ st
->pad
+ 1;
829 if (ssh
->v1_compressing
) {
830 unsigned char *decompblk
;
832 zlib_decompress_block(ssh
->pktin
.body
- 1, ssh
->pktin
.length
+ 1,
833 &decompblk
, &decomplen
);
835 if (ssh
->pktin
.maxlen
< st
->pad
+ decomplen
) {
836 ssh
->pktin
.maxlen
= st
->pad
+ decomplen
;
837 ssh
->pktin
.data
= srealloc(ssh
->pktin
.data
,
838 ssh
->pktin
.maxlen
+ APIEXTRA
);
839 ssh
->pktin
.body
= ssh
->pktin
.data
+ st
->pad
+ 1;
842 memcpy(ssh
->pktin
.body
- 1, decompblk
, decomplen
);
844 ssh
->pktin
.length
= decomplen
- 1;
847 ssh
->pktin
.type
= ssh
->pktin
.body
[-1];
849 log_packet(PKT_INCOMING
, ssh
->pktin
.type
, ssh1_pkt_type(ssh
->pktin
.type
),
850 ssh
->pktin
.body
, ssh
->pktin
.length
);
852 if (ssh
->pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
853 ssh
->pktin
.type
== SSH1_SMSG_STDERR_DATA
||
854 ssh
->pktin
.type
== SSH1_MSG_DEBUG
||
855 ssh
->pktin
.type
== SSH1_SMSG_AUTH_TIS_CHALLENGE
||
856 ssh
->pktin
.type
== SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
857 long stringlen
= GET_32BIT(ssh
->pktin
.body
);
858 if (stringlen
+ 4 != ssh
->pktin
.length
) {
859 bombout(("Received data packet with bogus string length"));
864 if (ssh
->pktin
.type
== SSH1_MSG_DEBUG
) {
865 /* log debug message */
867 int stringlen
= GET_32BIT(ssh
->pktin
.body
);
868 strcpy(buf
, "Remote debug message: ");
871 memcpy(buf
+ 8, ssh
->pktin
.body
+ 4, stringlen
);
872 buf
[8 + stringlen
] = '\0';
875 } else if (ssh
->pktin
.type
== SSH1_MSG_IGNORE
) {
880 if (ssh
->pktin
.type
== SSH1_MSG_DISCONNECT
) {
881 /* log reason code in disconnect message */
883 unsigned msglen
= GET_32BIT(ssh
->pktin
.body
);
885 strcpy(buf
, "Remote sent disconnect: ");
886 nowlen
= strlen(buf
);
887 if (msglen
> sizeof(buf
) - nowlen
- 1)
888 msglen
= sizeof(buf
) - nowlen
- 1;
889 memcpy(buf
+ nowlen
, ssh
->pktin
.body
+ 4, msglen
);
890 buf
[nowlen
+ msglen
] = '\0';
891 /* logevent(buf); (this is now done within the bombout macro) */
892 bombout(("Server sent disconnect message:\n\"%s\"", buf
+nowlen
));
899 static int ssh2_rdpkt(Ssh ssh
, unsigned char **data
, int *datalen
)
901 struct rdpkt2_state_tag
*st
= &ssh
->rdpkt2_state
;
903 crBegin(ssh
->ssh2_rdpkt_crstate
);
907 ssh
->pktin
.length
= 0;
909 st
->cipherblk
= ssh
->sccipher
->blksize
;
912 if (st
->cipherblk
< 8)
915 if (ssh
->pktin
.maxlen
< st
->cipherblk
) {
916 ssh
->pktin
.maxlen
= st
->cipherblk
;
917 ssh
->pktin
.data
= srealloc(ssh
->pktin
.data
, st
->cipherblk
+ APIEXTRA
);
921 * Acquire and decrypt the first block of the packet. This will
922 * contain the length and padding details.
924 for (st
->i
= st
->len
= 0; st
->i
< st
->cipherblk
; st
->i
++) {
925 while ((*datalen
) == 0)
926 crReturn(st
->cipherblk
- st
->i
);
927 ssh
->pktin
.data
[st
->i
] = *(*data
)++;
932 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
933 ssh
->pktin
.data
, st
->cipherblk
);
936 * Now get the length and padding figures.
938 st
->len
= GET_32BIT(ssh
->pktin
.data
);
939 st
->pad
= ssh
->pktin
.data
[4];
942 * _Completely_ silly lengths should be stomped on before they
943 * do us any more damage.
945 if (st
->len
< 0 || st
->pad
< 0 || st
->len
+ st
->pad
< 0) {
946 bombout(("Incoming packet was garbled on decryption"));
951 * This enables us to deduce the payload length.
953 st
->payload
= st
->len
- st
->pad
- 1;
955 ssh
->pktin
.length
= st
->payload
+ 5;
958 * So now we can work out the total packet length.
960 st
->packetlen
= st
->len
+ 4;
961 st
->maclen
= ssh
->scmac ? ssh
->scmac
->len
: 0;
964 * Adjust memory allocation if packet is too big.
966 if (ssh
->pktin
.maxlen
< st
->packetlen
+ st
->maclen
) {
967 ssh
->pktin
.maxlen
= st
->packetlen
+ st
->maclen
;
968 ssh
->pktin
.data
= srealloc(ssh
->pktin
.data
,
969 ssh
->pktin
.maxlen
+ APIEXTRA
);
973 * Read and decrypt the remainder of the packet.
975 for (st
->i
= st
->cipherblk
; st
->i
< st
->packetlen
+ st
->maclen
;
977 while ((*datalen
) == 0)
978 crReturn(st
->packetlen
+ st
->maclen
- st
->i
);
979 ssh
->pktin
.data
[st
->i
] = *(*data
)++;
982 /* Decrypt everything _except_ the MAC. */
984 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
985 ssh
->pktin
.data
+ st
->cipherblk
,
986 st
->packetlen
- st
->cipherblk
);
992 && !ssh
->scmac
->verify(ssh
->sc_mac_ctx
, ssh
->pktin
.data
, st
->len
+ 4,
993 st
->incoming_sequence
)) {
994 bombout(("Incorrect MAC received on packet"));
997 st
->incoming_sequence
++; /* whether or not we MACed */
1000 * Decompress packet payload.
1003 unsigned char *newpayload
;
1006 ssh
->sccomp
->decompress(ssh
->pktin
.data
+ 5, ssh
->pktin
.length
- 5,
1007 &newpayload
, &newlen
)) {
1008 if (ssh
->pktin
.maxlen
< newlen
+ 5) {
1009 ssh
->pktin
.maxlen
= newlen
+ 5;
1010 ssh
->pktin
.data
= srealloc(ssh
->pktin
.data
,
1011 ssh
->pktin
.maxlen
+ APIEXTRA
);
1013 ssh
->pktin
.length
= 5 + newlen
;
1014 memcpy(ssh
->pktin
.data
+ 5, newpayload
, newlen
);
1019 ssh
->pktin
.savedpos
= 6;
1020 ssh
->pktin
.type
= ssh
->pktin
.data
[5];
1022 log_packet(PKT_INCOMING
, ssh
->pktin
.type
,
1023 ssh2_pkt_type(ssh
->pkt_ctx
, ssh
->pktin
.type
),
1024 ssh
->pktin
.data
+6, ssh
->pktin
.length
-6);
1026 switch (ssh
->pktin
.type
) {
1028 * These packets we must handle instantly.
1030 case SSH2_MSG_DISCONNECT
:
1032 /* log reason code in disconnect message */
1034 int reason
= GET_32BIT(ssh
->pktin
.data
+ 6);
1035 unsigned msglen
= GET_32BIT(ssh
->pktin
.data
+ 10);
1037 if (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) {
1038 sprintf(buf
, "Received disconnect message (%s)",
1039 ssh2_disconnect_reasons
[reason
]);
1041 sprintf(buf
, "Received disconnect message (unknown type %d)",
1045 strcpy(buf
, "Disconnection message text: ");
1046 nowlen
= strlen(buf
);
1047 if (msglen
> sizeof(buf
) - nowlen
- 1)
1048 msglen
= sizeof(buf
) - nowlen
- 1;
1049 memcpy(buf
+ nowlen
, ssh
->pktin
.data
+ 14, msglen
);
1050 buf
[nowlen
+ msglen
] = '\0';
1052 bombout(("Server sent disconnect message\ntype %d (%s):\n\"%s\"",
1054 (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) ?
1055 ssh2_disconnect_reasons
[reason
] : "unknown",
1060 case SSH2_MSG_IGNORE
:
1062 case SSH2_MSG_DEBUG
:
1064 /* log the debug message */
1066 /* int display = ssh->pktin.body[6]; */
1067 int stringlen
= GET_32BIT(ssh
->pktin
.data
+7);
1069 strcpy(buf
, "Remote debug message: ");
1070 prefix
= strlen(buf
);
1071 if (stringlen
> (int)(sizeof(buf
)-prefix
-1))
1072 stringlen
= sizeof(buf
)-prefix
-1;
1073 memcpy(buf
+ prefix
, ssh
->pktin
.data
+ 11, stringlen
);
1074 buf
[prefix
+ stringlen
] = '\0';
1077 goto next_packet
; /* FIXME: print the debug message */
1080 * These packets we need do nothing about here.
1082 case SSH2_MSG_UNIMPLEMENTED
:
1083 case SSH2_MSG_SERVICE_REQUEST
:
1084 case SSH2_MSG_SERVICE_ACCEPT
:
1085 case SSH2_MSG_KEXINIT
:
1086 case SSH2_MSG_NEWKEYS
:
1087 case SSH2_MSG_KEXDH_INIT
:
1088 case SSH2_MSG_KEXDH_REPLY
:
1089 /* case SSH2_MSG_KEX_DH_GEX_REQUEST: duplicate case value */
1090 /* case SSH2_MSG_KEX_DH_GEX_GROUP: duplicate case value */
1091 case SSH2_MSG_KEX_DH_GEX_INIT
:
1092 case SSH2_MSG_KEX_DH_GEX_REPLY
:
1093 case SSH2_MSG_USERAUTH_REQUEST
:
1094 case SSH2_MSG_USERAUTH_FAILURE
:
1095 case SSH2_MSG_USERAUTH_SUCCESS
:
1096 case SSH2_MSG_USERAUTH_BANNER
:
1097 case SSH2_MSG_USERAUTH_PK_OK
:
1098 /* case SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ: duplicate case value */
1099 /* case SSH2_MSG_USERAUTH_INFO_REQUEST: duplicate case value */
1100 case SSH2_MSG_USERAUTH_INFO_RESPONSE
:
1101 case SSH2_MSG_GLOBAL_REQUEST
:
1102 case SSH2_MSG_REQUEST_SUCCESS
:
1103 case SSH2_MSG_REQUEST_FAILURE
:
1104 case SSH2_MSG_CHANNEL_OPEN
:
1105 case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
:
1106 case SSH2_MSG_CHANNEL_OPEN_FAILURE
:
1107 case SSH2_MSG_CHANNEL_WINDOW_ADJUST
:
1108 case SSH2_MSG_CHANNEL_DATA
:
1109 case SSH2_MSG_CHANNEL_EXTENDED_DATA
:
1110 case SSH2_MSG_CHANNEL_EOF
:
1111 case SSH2_MSG_CHANNEL_CLOSE
:
1112 case SSH2_MSG_CHANNEL_REQUEST
:
1113 case SSH2_MSG_CHANNEL_SUCCESS
:
1114 case SSH2_MSG_CHANNEL_FAILURE
:
1118 * For anything else we send SSH2_MSG_UNIMPLEMENTED.
1121 ssh2_pkt_init(ssh
, SSH2_MSG_UNIMPLEMENTED
);
1122 ssh2_pkt_adduint32(ssh
, st
->incoming_sequence
- 1);
1130 static void ssh1_pktout_size(Ssh ssh
, int len
)
1134 len
+= 5; /* type and CRC */
1135 pad
= 8 - (len
% 8);
1138 ssh
->pktout
.length
= len
- 5;
1139 if (ssh
->pktout
.maxlen
< biglen
) {
1140 ssh
->pktout
.maxlen
= biglen
;
1142 /* Allocate enough buffer space for extra block
1143 * for MS CryptEncrypt() */
1144 ssh
->pktout
.data
= srealloc(ssh
->pktout
.data
, biglen
+ 12);
1146 ssh
->pktout
.data
= srealloc(ssh
->pktout
.data
, biglen
+ 4);
1149 ssh
->pktout
.body
= ssh
->pktout
.data
+ 4 + pad
+ 1;
1152 static void s_wrpkt_start(Ssh ssh
, int type
, int len
)
1154 ssh1_pktout_size(ssh
, len
);
1155 ssh
->pktout
.type
= type
;
1158 static int s_wrpkt_prepare(Ssh ssh
)
1160 int pad
, len
, biglen
, i
;
1163 ssh
->pktout
.body
[-1] = ssh
->pktout
.type
;
1165 log_packet(PKT_OUTGOING
, ssh
->pktout
.type
, ssh1_pkt_type(ssh
->pktout
.type
),
1166 ssh
->pktout
.body
, ssh
->pktout
.length
);
1168 if (ssh
->v1_compressing
) {
1169 unsigned char *compblk
;
1171 zlib_compress_block(ssh
->pktout
.body
- 1, ssh
->pktout
.length
+ 1,
1172 &compblk
, &complen
);
1173 ssh1_pktout_size(ssh
, complen
- 1);
1174 memcpy(ssh
->pktout
.body
- 1, compblk
, complen
);
1178 len
= ssh
->pktout
.length
+ 5; /* type and CRC */
1179 pad
= 8 - (len
% 8);
1182 for (i
= 0; i
< pad
; i
++)
1183 ssh
->pktout
.data
[i
+ 4] = random_byte();
1184 crc
= crc32(ssh
->pktout
.data
+ 4, biglen
- 4);
1185 PUT_32BIT(ssh
->pktout
.data
+ biglen
, crc
);
1186 PUT_32BIT(ssh
->pktout
.data
, len
);
1189 ssh
->cipher
->encrypt(ssh
->v1_cipher_ctx
, ssh
->pktout
.data
+ 4, biglen
);
1194 static void s_wrpkt(Ssh ssh
)
1197 len
= s_wrpkt_prepare(ssh
);
1198 backlog
= sk_write(ssh
->s
, ssh
->pktout
.data
, len
);
1199 if (backlog
> SSH_MAX_BACKLOG
)
1200 ssh_throttle_all(ssh
, 1, backlog
);
1203 static void s_wrpkt_defer(Ssh ssh
)
1206 len
= s_wrpkt_prepare(ssh
);
1207 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1208 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1209 ssh
->deferred_send_data
= srealloc(ssh
->deferred_send_data
,
1210 ssh
->deferred_size
);
1212 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, ssh
->pktout
.data
, len
);
1213 ssh
->deferred_len
+= len
;
1217 * Construct a packet with the specified contents.
1219 static void construct_packet(Ssh ssh
, int pkttype
, va_list ap1
, va_list ap2
)
1221 unsigned char *p
, *argp
, argchar
;
1222 unsigned long argint
;
1223 int pktlen
, argtype
, arglen
;
1227 while ((argtype
= va_arg(ap1
, int)) != PKT_END
) {
1230 (void) va_arg(ap1
, int);
1234 (void) va_arg(ap1
, char);
1238 (void) va_arg(ap1
, unsigned char *);
1239 arglen
= va_arg(ap1
, int);
1243 argp
= va_arg(ap1
, unsigned char *);
1244 arglen
= strlen(argp
);
1245 pktlen
+= 4 + arglen
;
1248 bn
= va_arg(ap1
, Bignum
);
1249 pktlen
+= ssh1_bignum_length(bn
);
1256 s_wrpkt_start(ssh
, pkttype
, pktlen
);
1257 p
= ssh
->pktout
.body
;
1259 while ((argtype
= va_arg(ap2
, int)) != PKT_END
) {
1262 argint
= va_arg(ap2
, int);
1263 PUT_32BIT(p
, argint
);
1267 argchar
= va_arg(ap2
, unsigned char);
1272 argp
= va_arg(ap2
, unsigned char *);
1273 arglen
= va_arg(ap2
, int);
1274 memcpy(p
, argp
, arglen
);
1278 argp
= va_arg(ap2
, unsigned char *);
1279 arglen
= strlen(argp
);
1280 PUT_32BIT(p
, arglen
);
1281 memcpy(p
+ 4, argp
, arglen
);
1285 bn
= va_arg(ap2
, Bignum
);
1286 p
+= ssh1_write_bignum(p
, bn
);
1292 static void send_packet(Ssh ssh
, int pkttype
, ...)
1295 va_start(ap1
, pkttype
);
1296 va_start(ap2
, pkttype
);
1297 construct_packet(ssh
, pkttype
, ap1
, ap2
);
1301 static void defer_packet(Ssh ssh
, int pkttype
, ...)
1304 va_start(ap1
, pkttype
);
1305 va_start(ap2
, pkttype
);
1306 construct_packet(ssh
, pkttype
, ap1
, ap2
);
1310 static int ssh_versioncmp(char *a
, char *b
)
1313 unsigned long av
, bv
;
1315 av
= strtoul(a
, &ae
, 10);
1316 bv
= strtoul(b
, &be
, 10);
1318 return (av
< bv ?
-1 : +1);
1323 av
= strtoul(ae
, &ae
, 10);
1324 bv
= strtoul(be
, &be
, 10);
1326 return (av
< bv ?
-1 : +1);
1331 * Utility routines for putting an SSH-protocol `string' and
1332 * `uint32' into a SHA state.
1335 static void sha_string(SHA_State
* s
, void *str
, int len
)
1337 unsigned char lenblk
[4];
1338 PUT_32BIT(lenblk
, len
);
1339 SHA_Bytes(s
, lenblk
, 4);
1340 SHA_Bytes(s
, str
, len
);
1343 static void sha_uint32(SHA_State
* s
, unsigned i
)
1345 unsigned char intblk
[4];
1346 PUT_32BIT(intblk
, i
);
1347 SHA_Bytes(s
, intblk
, 4);
1351 * SSH2 packet construction functions.
1353 static void ssh2_pkt_ensure(Ssh ssh
, int length
)
1355 if (ssh
->pktout
.maxlen
< length
) {
1356 ssh
->pktout
.maxlen
= length
+ 256;
1357 ssh
->pktout
.data
= srealloc(ssh
->pktout
.data
,
1358 ssh
->pktout
.maxlen
+ APIEXTRA
);
1359 if (!ssh
->pktout
.data
)
1360 fatalbox("Out of memory");
1363 static void ssh2_pkt_adddata(Ssh ssh
, void *data
, int len
)
1365 ssh
->pktout
.length
+= len
;
1366 ssh2_pkt_ensure(ssh
, ssh
->pktout
.length
);
1367 memcpy(ssh
->pktout
.data
+ ssh
->pktout
.length
- len
, data
, len
);
1369 static void ssh2_pkt_addbyte(Ssh ssh
, unsigned char byte
)
1371 ssh2_pkt_adddata(ssh
, &byte
, 1);
1373 static void ssh2_pkt_init(Ssh ssh
, int pkt_type
)
1375 ssh
->pktout
.length
= 5;
1376 ssh2_pkt_addbyte(ssh
, (unsigned char) pkt_type
);
1378 static void ssh2_pkt_addbool(Ssh ssh
, unsigned char value
)
1380 ssh2_pkt_adddata(ssh
, &value
, 1);
1382 static void ssh2_pkt_adduint32(Ssh ssh
, unsigned long value
)
1385 PUT_32BIT(x
, value
);
1386 ssh2_pkt_adddata(ssh
, x
, 4);
1388 static void ssh2_pkt_addstring_start(Ssh ssh
)
1390 ssh2_pkt_adduint32(ssh
, 0);
1391 ssh
->pktout
.savedpos
= ssh
->pktout
.length
;
1393 static void ssh2_pkt_addstring_str(Ssh ssh
, char *data
)
1395 ssh2_pkt_adddata(ssh
, data
, strlen(data
));
1396 PUT_32BIT(ssh
->pktout
.data
+ ssh
->pktout
.savedpos
- 4,
1397 ssh
->pktout
.length
- ssh
->pktout
.savedpos
);
1399 static void ssh2_pkt_addstring_data(Ssh ssh
, char *data
, int len
)
1401 ssh2_pkt_adddata(ssh
, data
, len
);
1402 PUT_32BIT(ssh
->pktout
.data
+ ssh
->pktout
.savedpos
- 4,
1403 ssh
->pktout
.length
- ssh
->pktout
.savedpos
);
1405 static void ssh2_pkt_addstring(Ssh ssh
, char *data
)
1407 ssh2_pkt_addstring_start(ssh
);
1408 ssh2_pkt_addstring_str(ssh
, data
);
1410 static char *ssh2_mpint_fmt(Bignum b
, int *len
)
1413 int i
, n
= (bignum_bitcount(b
) + 7) / 8;
1416 fatalbox("out of memory");
1418 for (i
= 1; i
<= n
; i
++)
1419 p
[i
] = bignum_byte(b
, n
- i
);
1421 while (i
<= n
&& p
[i
] == 0 && (p
[i
+ 1] & 0x80) == 0)
1423 memmove(p
, p
+ i
, n
+ 1 - i
);
1427 static void ssh2_pkt_addmp(Ssh ssh
, Bignum b
)
1431 p
= ssh2_mpint_fmt(b
, &len
);
1432 ssh2_pkt_addstring_start(ssh
);
1433 ssh2_pkt_addstring_data(ssh
, p
, len
);
1438 * Construct an SSH2 final-form packet: compress it, encrypt it,
1439 * put the MAC on it. Final packet, ready to be sent, is stored in
1440 * ssh->pktout.data. Total length is returned.
1442 static int ssh2_pkt_construct(Ssh ssh
)
1444 int cipherblk
, maclen
, padding
, i
;
1446 log_packet(PKT_OUTGOING
, ssh
->pktout
.data
[5],
1447 ssh2_pkt_type(ssh
->pkt_ctx
, ssh
->pktout
.data
[5]),
1448 ssh
->pktout
.data
+ 6, ssh
->pktout
.length
- 6);
1451 * Compress packet payload.
1454 unsigned char *newpayload
;
1457 ssh
->cscomp
->compress(ssh
->pktout
.data
+ 5, ssh
->pktout
.length
- 5,
1458 &newpayload
, &newlen
)) {
1459 ssh
->pktout
.length
= 5;
1460 ssh2_pkt_adddata(ssh
, newpayload
, newlen
);
1466 * Add padding. At least four bytes, and must also bring total
1467 * length (minus MAC) up to a multiple of the block size.
1469 cipherblk
= ssh
->cscipher ? ssh
->cscipher
->blksize
: 8; /* block size */
1470 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
1473 (cipherblk
- (ssh
->pktout
.length
+ padding
) % cipherblk
) % cipherblk
;
1474 maclen
= ssh
->csmac ? ssh
->csmac
->len
: 0;
1475 ssh2_pkt_ensure(ssh
, ssh
->pktout
.length
+ padding
+ maclen
);
1476 ssh
->pktout
.data
[4] = padding
;
1477 for (i
= 0; i
< padding
; i
++)
1478 ssh
->pktout
.data
[ssh
->pktout
.length
+ i
] = random_byte();
1479 PUT_32BIT(ssh
->pktout
.data
, ssh
->pktout
.length
+ padding
- 4);
1481 ssh
->csmac
->generate(ssh
->cs_mac_ctx
, ssh
->pktout
.data
,
1482 ssh
->pktout
.length
+ padding
,
1483 ssh
->v2_outgoing_sequence
);
1484 ssh
->v2_outgoing_sequence
++; /* whether or not we MACed */
1487 ssh
->cscipher
->encrypt(ssh
->cs_cipher_ctx
,
1488 ssh
->pktout
.data
, ssh
->pktout
.length
+ padding
);
1490 /* Ready-to-send packet starts at ssh->pktout.data. We return length. */
1491 return ssh
->pktout
.length
+ padding
+ maclen
;
1495 * Construct and send an SSH2 packet immediately.
1497 static void ssh2_pkt_send(Ssh ssh
)
1501 len
= ssh2_pkt_construct(ssh
);
1502 backlog
= sk_write(ssh
->s
, ssh
->pktout
.data
, len
);
1503 if (backlog
> SSH_MAX_BACKLOG
)
1504 ssh_throttle_all(ssh
, 1, backlog
);
1508 * Construct an SSH2 packet and add it to a deferred data block.
1509 * Useful for sending multiple packets in a single sk_write() call,
1510 * to prevent a traffic-analysing listener from being able to work
1511 * out the length of any particular packet (such as the password
1514 * Note that because SSH2 sequence-numbers its packets, this can
1515 * NOT be used as an m4-style `defer' allowing packets to be
1516 * constructed in one order and sent in another.
1518 static void ssh2_pkt_defer(Ssh ssh
)
1520 int len
= ssh2_pkt_construct(ssh
);
1521 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1522 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1523 ssh
->deferred_send_data
= srealloc(ssh
->deferred_send_data
,
1524 ssh
->deferred_size
);
1526 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, ssh
->pktout
.data
, len
);
1527 ssh
->deferred_len
+= len
;
1531 * Send the whole deferred data block constructed by
1532 * ssh2_pkt_defer() or SSH1's defer_packet().
1534 static void ssh_pkt_defersend(Ssh ssh
)
1537 backlog
= sk_write(ssh
->s
, ssh
->deferred_send_data
, ssh
->deferred_len
);
1538 ssh
->deferred_len
= ssh
->deferred_size
= 0;
1539 sfree(ssh
->deferred_send_data
);
1540 ssh
->deferred_send_data
= NULL
;
1541 if (backlog
> SSH_MAX_BACKLOG
)
1542 ssh_throttle_all(ssh
, 1, backlog
);
1546 void bndebug(char *string
, Bignum b
)
1550 p
= ssh2_mpint_fmt(b
, &len
);
1551 debug(("%s", string
));
1552 for (i
= 0; i
< len
; i
++)
1553 debug((" %02x", p
[i
]));
1559 static void sha_mpint(SHA_State
* s
, Bignum b
)
1563 p
= ssh2_mpint_fmt(b
, &len
);
1564 sha_string(s
, p
, len
);
1569 * SSH2 packet decode functions.
1571 static unsigned long ssh2_pkt_getuint32(Ssh ssh
)
1573 unsigned long value
;
1574 if (ssh
->pktin
.length
- ssh
->pktin
.savedpos
< 4)
1575 return 0; /* arrgh, no way to decline (FIXME?) */
1576 value
= GET_32BIT(ssh
->pktin
.data
+ ssh
->pktin
.savedpos
);
1577 ssh
->pktin
.savedpos
+= 4;
1580 static int ssh2_pkt_getbool(Ssh ssh
)
1582 unsigned long value
;
1583 if (ssh
->pktin
.length
- ssh
->pktin
.savedpos
< 1)
1584 return 0; /* arrgh, no way to decline (FIXME?) */
1585 value
= ssh
->pktin
.data
[ssh
->pktin
.savedpos
] != 0;
1586 ssh
->pktin
.savedpos
++;
1589 static void ssh2_pkt_getstring(Ssh ssh
, char **p
, int *length
)
1593 if (ssh
->pktin
.length
- ssh
->pktin
.savedpos
< 4)
1595 *length
= GET_32BIT(ssh
->pktin
.data
+ ssh
->pktin
.savedpos
);
1596 ssh
->pktin
.savedpos
+= 4;
1597 if (ssh
->pktin
.length
- ssh
->pktin
.savedpos
< *length
)
1599 *p
= ssh
->pktin
.data
+ ssh
->pktin
.savedpos
;
1600 ssh
->pktin
.savedpos
+= *length
;
1602 static Bignum
ssh2_pkt_getmp(Ssh ssh
)
1608 ssh2_pkt_getstring(ssh
, &p
, &length
);
1612 bombout(("internal error: Can't handle negative mpints"));
1615 b
= bignum_from_bytes(p
, length
);
1620 * Helper function to add an SSH2 signature blob to a packet.
1621 * Expects to be shown the public key blob as well as the signature
1622 * blob. Normally works just like ssh2_pkt_addstring, but will
1623 * fiddle with the signature packet if necessary for
1624 * BUG_SSH2_RSA_PADDING.
1626 static void ssh2_add_sigblob(Ssh ssh
, void *pkblob_v
, int pkblob_len
,
1627 void *sigblob_v
, int sigblob_len
)
1629 unsigned char *pkblob
= (unsigned char *)pkblob_v
;
1630 unsigned char *sigblob
= (unsigned char *)sigblob_v
;
1632 /* dmemdump(pkblob, pkblob_len); */
1633 /* dmemdump(sigblob, sigblob_len); */
1636 * See if this is in fact an ssh-rsa signature and a buggy
1637 * server; otherwise we can just do this the easy way.
1639 if ((ssh
->remote_bugs
& BUG_SSH2_RSA_PADDING
) &&
1640 (GET_32BIT(pkblob
) == 7 && !memcmp(pkblob
+4, "ssh-rsa", 7))) {
1641 int pos
, len
, siglen
;
1644 * Find the byte length of the modulus.
1647 pos
= 4+7; /* skip over "ssh-rsa" */
1648 pos
+= 4 + GET_32BIT(pkblob
+pos
); /* skip over exponent */
1649 len
= GET_32BIT(pkblob
+pos
); /* find length of modulus */
1650 pos
+= 4; /* find modulus itself */
1651 while (len
> 0 && pkblob
[pos
] == 0)
1653 /* debug(("modulus length is %d\n", len)); */
1656 * Now find the signature integer.
1658 pos
= 4+7; /* skip over "ssh-rsa" */
1659 siglen
= GET_32BIT(sigblob
+pos
);
1660 /* debug(("signature length is %d\n", siglen)); */
1662 if (len
!= siglen
) {
1663 unsigned char newlen
[4];
1664 ssh2_pkt_addstring_start(ssh
);
1665 ssh2_pkt_addstring_data(ssh
, sigblob
, pos
);
1666 /* dmemdump(sigblob, pos); */
1667 pos
+= 4; /* point to start of actual sig */
1668 PUT_32BIT(newlen
, len
);
1669 ssh2_pkt_addstring_data(ssh
, newlen
, 4);
1670 /* dmemdump(newlen, 4); */
1672 while (len
-- > siglen
) {
1673 ssh2_pkt_addstring_data(ssh
, newlen
, 1);
1674 /* dmemdump(newlen, 1); */
1676 ssh2_pkt_addstring_data(ssh
, sigblob
+pos
, siglen
);
1677 /* dmemdump(sigblob+pos, siglen); */
1681 /* Otherwise fall through and do it the easy way. */
1684 ssh2_pkt_addstring_start(ssh
);
1685 ssh2_pkt_addstring_data(ssh
, sigblob
, sigblob_len
);
1689 * Examine the remote side's version string and compare it against
1690 * a list of known buggy implementations.
1692 static void ssh_detect_bugs(Ssh ssh
, char *vstring
)
1694 char *imp
; /* pointer to implementation part */
1696 imp
+= strcspn(imp
, "-");
1698 imp
+= strcspn(imp
, "-");
1701 ssh
->remote_bugs
= 0;
1703 if (cfg
.sshbug_ignore1
== BUG_ON
||
1704 (cfg
.sshbug_ignore1
== BUG_AUTO
&&
1705 (!strcmp(imp
, "1.2.18") || !strcmp(imp
, "1.2.19") ||
1706 !strcmp(imp
, "1.2.20") || !strcmp(imp
, "1.2.21") ||
1707 !strcmp(imp
, "1.2.22") || !strcmp(imp
, "Cisco-1.25")))) {
1709 * These versions don't support SSH1_MSG_IGNORE, so we have
1710 * to use a different defence against password length
1713 ssh
->remote_bugs
|= BUG_CHOKES_ON_SSH1_IGNORE
;
1714 logevent("We believe remote version has SSH1 ignore bug");
1717 if (cfg
.sshbug_plainpw1
== BUG_ON
||
1718 (cfg
.sshbug_plainpw1
== BUG_AUTO
&&
1719 (!strcmp(imp
, "Cisco-1.25")))) {
1721 * These versions need a plain password sent; they can't
1722 * handle having a null and a random length of data after
1725 ssh
->remote_bugs
|= BUG_NEEDS_SSH1_PLAIN_PASSWORD
;
1726 logevent("We believe remote version needs a plain SSH1 password");
1729 if (cfg
.sshbug_rsa1
== BUG_ON
||
1730 (cfg
.sshbug_rsa1
== BUG_AUTO
&&
1731 (!strcmp(imp
, "Cisco-1.25")))) {
1733 * These versions apparently have no clue whatever about
1734 * RSA authentication and will panic and die if they see
1735 * an AUTH_RSA message.
1737 ssh
->remote_bugs
|= BUG_CHOKES_ON_RSA
;
1738 logevent("We believe remote version can't handle RSA authentication");
1741 if (cfg
.sshbug_hmac2
== BUG_ON
||
1742 (cfg
.sshbug_hmac2
== BUG_AUTO
&&
1743 (!strncmp(imp
, "2.1.0", 5) || !strncmp(imp
, "2.0.", 4) ||
1744 !strncmp(imp
, "2.2.0", 5) || !strncmp(imp
, "2.3.0", 5) ||
1745 !strncmp(imp
, "2.1 ", 4)))) {
1747 * These versions have the HMAC bug.
1749 ssh
->remote_bugs
|= BUG_SSH2_HMAC
;
1750 logevent("We believe remote version has SSH2 HMAC bug");
1753 if (cfg
.sshbug_derivekey2
== BUG_ON
||
1754 (cfg
.sshbug_derivekey2
== BUG_AUTO
&&
1755 (!strncmp(imp
, "2.0.", 4)))) {
1757 * These versions have the key-derivation bug (failing to
1758 * include the literal shared secret in the hashes that
1759 * generate the keys).
1761 ssh
->remote_bugs
|= BUG_SSH2_DERIVEKEY
;
1762 logevent("We believe remote version has SSH2 key-derivation bug");
1765 if (cfg
.sshbug_rsapad2
== BUG_ON
||
1766 (cfg
.sshbug_rsapad2
== BUG_AUTO
&&
1767 ((!strncmp(imp
, "OpenSSH_2.", 10) && imp
[10]>='5' && imp
[10]<='9') ||
1768 (!strncmp(imp
, "OpenSSH_3.", 10) && imp
[10]>='0' && imp
[10]<='2')))){
1770 * These versions have the SSH2 RSA padding bug.
1772 ssh
->remote_bugs
|= BUG_SSH2_RSA_PADDING
;
1773 logevent("We believe remote version has SSH2 RSA padding bug");
1776 if (cfg
.sshbug_dhgex2
== BUG_ON
) {
1778 * These versions have the SSH2 DH GEX bug.
1780 ssh
->remote_bugs
|= BUG_SSH2_DH_GEX
;
1781 logevent("We believe remote version has SSH2 DH group exchange bug");
1785 static int do_ssh_init(Ssh ssh
, unsigned char c
)
1787 struct do_ssh_init_state
{
1795 crState(do_ssh_init_state
);
1797 crBegin(ssh
->do_ssh_init_crstate
);
1799 /* Search for the string "SSH-" in the input. */
1802 static const int transS
[] = { 1, 2, 2, 1 };
1803 static const int transH
[] = { 0, 0, 3, 0 };
1804 static const int transminus
[] = { 0, 0, 0, -1 };
1806 s
->i
= transS
[s
->i
];
1808 s
->i
= transH
[s
->i
];
1810 s
->i
= transminus
[s
->i
];
1815 crReturn(1); /* get another character */
1819 s
->vstring
= smalloc(s
->vstrsize
);
1820 strcpy(s
->vstring
, "SSH-");
1824 crReturn(1); /* get another char */
1825 if (s
->vslen
>= s
->vstrsize
- 1) {
1827 s
->vstring
= srealloc(s
->vstring
, s
->vstrsize
);
1829 s
->vstring
[s
->vslen
++] = c
;
1832 s
->version
[s
->i
] = '\0';
1834 } else if (s
->i
< sizeof(s
->version
) - 1)
1835 s
->version
[s
->i
++] = c
;
1836 } else if (c
== '\n')
1840 ssh
->agentfwd_enabled
= FALSE
;
1841 ssh
->rdpkt2_state
.incoming_sequence
= 0;
1843 s
->vstring
[s
->vslen
] = 0;
1844 s
->vstring
[strcspn(s
->vstring
, "\r\n")] = '\0';/* remove EOL chars */
1847 vlog
= smalloc(20 + s
->vslen
);
1848 sprintf(vlog
, "Server version: %s", s
->vstring
);
1852 ssh_detect_bugs(ssh
, s
->vstring
);
1855 * Decide which SSH protocol version to support.
1858 /* Anything strictly below "2.0" means protocol 1 is supported. */
1859 s
->proto1
= ssh_versioncmp(s
->version
, "2.0") < 0;
1860 /* Anything greater or equal to "1.99" means protocol 2 is supported. */
1861 s
->proto2
= ssh_versioncmp(s
->version
, "1.99") >= 0;
1863 if (cfg
.sshprot
== 0 && !s
->proto1
) {
1864 bombout(("SSH protocol version 1 required by user but not provided by server"));
1867 if (cfg
.sshprot
== 3 && !s
->proto2
) {
1868 bombout(("SSH protocol version 2 required by user but not provided by server"));
1872 if (s
->proto2
&& (cfg
.sshprot
>= 2 || !s
->proto1
)) {
1876 char verstring
[80], vlog
[100];
1877 sprintf(verstring
, "SSH-2.0-%s", sshver
);
1878 SHA_Init(&ssh
->exhashbase
);
1880 * Hash our version string and their version string.
1882 sha_string(&ssh
->exhashbase
, verstring
, strlen(verstring
));
1883 sha_string(&ssh
->exhashbase
, s
->vstring
, strcspn(s
->vstring
, "\r\n"));
1884 sprintf(vlog
, "We claim version: %s", verstring
);
1886 strcat(verstring
, "\n");
1887 logevent("Using SSH protocol version 2");
1888 sk_write(ssh
->s
, verstring
, strlen(verstring
));
1889 ssh
->protocol
= ssh2_protocol
;
1891 ssh
->s_rdpkt
= ssh2_rdpkt
;
1896 char verstring
[80], vlog
[100];
1897 sprintf(verstring
, "SSH-%s-%s",
1898 (ssh_versioncmp(s
->version
, "1.5") <= 0 ? s
->version
: "1.5"),
1900 sprintf(vlog
, "We claim version: %s", verstring
);
1902 strcat(verstring
, "\n");
1904 logevent("Using SSH protocol version 1");
1905 sk_write(ssh
->s
, verstring
, strlen(verstring
));
1906 ssh
->protocol
= ssh1_protocol
;
1908 ssh
->s_rdpkt
= ssh1_rdpkt
;
1910 ssh
->state
= SSH_STATE_BEFORE_SIZE
;
1917 static void ssh_gotdata(Ssh ssh
, unsigned char *data
, int datalen
)
1919 crBegin(ssh
->ssh_gotdata_crstate
);
1922 * To begin with, feed the characters one by one to the
1923 * protocol initialisation / selection function do_ssh_init().
1924 * When that returns 0, we're done with the initial greeting
1925 * exchange and can move on to packet discipline.
1928 int ret
; /* need not be kept across crReturn */
1930 crReturnV
; /* more data please */
1931 ret
= do_ssh_init(ssh
, *data
);
1939 * We emerge from that loop when the initial negotiation is
1940 * over and we have selected an s_rdpkt function. Now pass
1941 * everything to s_rdpkt, and then pass the resulting packets
1942 * to the proper protocol handler.
1947 while (datalen
> 0) {
1948 if (ssh
->s_rdpkt(ssh
, &data
, &datalen
) == 0) {
1949 if (ssh
->state
== SSH_STATE_CLOSED
) {
1952 ssh
->protocol(ssh
, NULL
, 0, 1);
1953 if (ssh
->state
== SSH_STATE_CLOSED
) {
1963 static int ssh_closing(Plug plug
, char *error_msg
, int error_code
,
1966 Ssh ssh
= (Ssh
) plug
;
1967 ssh
->state
= SSH_STATE_CLOSED
;
1973 /* A socket error has occurred. */
1974 logevent(error_msg
);
1975 connection_fatal(error_msg
);
1977 /* Otherwise, the remote side closed the connection normally. */
1982 static int ssh_receive(Plug plug
, int urgent
, char *data
, int len
)
1984 Ssh ssh
= (Ssh
) plug
;
1985 ssh_gotdata(ssh
, data
, len
);
1986 if (ssh
->state
== SSH_STATE_CLOSED
) {
1996 static void ssh_sent(Plug plug
, int bufsize
)
1998 Ssh ssh
= (Ssh
) plug
;
2000 * If the send backlog on the SSH socket itself clears, we
2001 * should unthrottle the whole world if it was throttled.
2003 if (bufsize
< SSH_MAX_BACKLOG
)
2004 ssh_throttle_all(ssh
, 0, bufsize
);
2008 * Connect to specified host and port.
2009 * Returns an error message, or NULL on success.
2010 * Also places the canonical host name into `realhost'. It must be
2011 * freed by the caller.
2013 static char *connect_to_host(Ssh ssh
, char *host
, int port
,
2014 char **realhost
, int nodelay
)
2016 static const struct plug_function_table fn_table
= {
2026 ssh
->savedhost
= smalloc(1 + strlen(host
));
2027 if (!ssh
->savedhost
)
2028 fatalbox("Out of memory");
2029 strcpy(ssh
->savedhost
, host
);
2032 port
= 22; /* default ssh port */
2033 ssh
->savedport
= port
;
2040 sprintf(buf
, "Looking up host \"%.170s\"", host
);
2043 addr
= sk_namelookup(host
, realhost
);
2044 if ((err
= sk_addr_error(addr
)))
2051 char buf
[200], addrbuf
[100];
2052 sk_getaddr(addr
, addrbuf
, 100);
2053 sprintf(buf
, "Connecting to %.100s port %d", addrbuf
, port
);
2056 ssh
->fn
= &fn_table
;
2057 ssh
->s
= new_connection(addr
, *realhost
, port
, 0, 1, nodelay
, (Plug
) ssh
);
2058 if ((err
= sk_socket_error(ssh
->s
))) {
2067 * Throttle or unthrottle the SSH connection.
2069 static void ssh1_throttle(Ssh ssh
, int adjust
)
2071 int old_count
= ssh
->v1_throttle_count
;
2072 ssh
->v1_throttle_count
+= adjust
;
2073 assert(ssh
->v1_throttle_count
>= 0);
2074 if (ssh
->v1_throttle_count
&& !old_count
) {
2075 sk_set_frozen(ssh
->s
, 1);
2076 } else if (!ssh
->v1_throttle_count
&& old_count
) {
2077 sk_set_frozen(ssh
->s
, 0);
2082 * Throttle or unthrottle _all_ local data streams (for when sends
2083 * on the SSH connection itself back up).
2085 static void ssh_throttle_all(Ssh ssh
, int enable
, int bufsize
)
2088 struct ssh_channel
*c
;
2090 if (enable
== ssh
->throttled_all
)
2092 ssh
->throttled_all
= enable
;
2093 ssh
->overall_bufsize
= bufsize
;
2096 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
2098 case CHAN_MAINSESSION
:
2100 * This is treated separately, outside the switch.
2104 x11_override_throttle(c
->u
.x11
.s
, enable
);
2107 /* Agent channels require no buffer management. */
2110 pfd_override_throttle(c
->u
.x11
.s
, enable
);
2117 * Username and password input, abstracted off into routines
2118 * reusable in several places - even between SSH1 and SSH2.
2121 /* Set up a username or password input loop on a given buffer. */
2122 void setup_userpass_input(Ssh ssh
, char *buffer
, int buflen
, int echo
)
2124 ssh
->userpass_input_buffer
= buffer
;
2125 ssh
->userpass_input_buflen
= buflen
;
2126 ssh
->userpass_input_bufpos
= 0;
2127 ssh
->userpass_input_echo
= echo
;
2131 * Process some terminal data in the course of username/password
2132 * input. Returns >0 for success (line of input returned in
2133 * buffer), <0 for failure (user hit ^C/^D, bomb out and exit), 0
2134 * for inconclusive (keep waiting for more input please).
2136 int process_userpass_input(Ssh ssh
, unsigned char *in
, int inlen
)
2141 switch (c
= *in
++) {
2144 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
] = 0;
2145 ssh
->userpass_input_buffer
[ssh
->userpass_input_buflen
-1] = 0;
2150 if (ssh
->userpass_input_bufpos
> 0) {
2151 if (ssh
->userpass_input_echo
)
2152 c_write_str(ssh
, "\b \b");
2153 ssh
->userpass_input_bufpos
--;
2158 while (ssh
->userpass_input_bufpos
> 0) {
2159 if (ssh
->userpass_input_echo
)
2160 c_write_str(ssh
, "\b \b");
2161 ssh
->userpass_input_bufpos
--;
2169 if (((c
>= ' ' && c
<= '~') ||
2170 ((unsigned char) c
>= 160))
2171 && ssh
->userpass_input_bufpos
< ssh
->userpass_input_buflen
-1) {
2172 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
++] = c
;
2173 if (ssh
->userpass_input_echo
)
2174 c_write(ssh
, &c
, 1);
2183 * Handle the key exchange and user authentication phases.
2185 static int do_ssh1_login(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
2188 unsigned char cookie
[8];
2189 struct RSAKey servkey
, hostkey
;
2190 struct MD5Context md5c
;
2191 struct do_ssh1_login_state
{
2193 unsigned char *rsabuf
, *keystr1
, *keystr2
;
2194 unsigned long supported_ciphers_mask
, supported_auths_mask
;
2195 int tried_publickey
, tried_agent
;
2196 int tis_auth_refused
, ccard_auth_refused
;
2197 unsigned char session_id
[16];
2200 void *publickey_blob
;
2201 int publickey_bloblen
;
2207 unsigned char request
[5], *response
, *p
;
2216 crState(do_ssh1_login_state
);
2218 crBegin(ssh
->do_ssh1_login_crstate
);
2223 if (ssh
->pktin
.type
!= SSH1_SMSG_PUBLIC_KEY
) {
2224 bombout(("Public key packet not received"));
2228 logevent("Received public keys");
2230 memcpy(cookie
, ssh
->pktin
.body
, 8);
2232 i
= makekey(ssh
->pktin
.body
+ 8, &servkey
, &s
->keystr1
, 0);
2233 j
= makekey(ssh
->pktin
.body
+ 8 + i
, &hostkey
, &s
->keystr2
, 0);
2236 * Log the host key fingerprint.
2240 logevent("Host key fingerprint is:");
2241 strcpy(logmsg
, " ");
2242 hostkey
.comment
= NULL
;
2243 rsa_fingerprint(logmsg
+ strlen(logmsg
),
2244 sizeof(logmsg
) - strlen(logmsg
), &hostkey
);
2248 ssh
->v1_remote_protoflags
= GET_32BIT(ssh
->pktin
.body
+ 8 + i
+ j
);
2249 s
->supported_ciphers_mask
= GET_32BIT(ssh
->pktin
.body
+ 12 + i
+ j
);
2250 s
->supported_auths_mask
= GET_32BIT(ssh
->pktin
.body
+ 16 + i
+ j
);
2252 ssh
->v1_local_protoflags
=
2253 ssh
->v1_remote_protoflags
& SSH1_PROTOFLAGS_SUPPORTED
;
2254 ssh
->v1_local_protoflags
|= SSH1_PROTOFLAG_SCREEN_NUMBER
;
2257 MD5Update(&md5c
, s
->keystr2
, hostkey
.bytes
);
2258 MD5Update(&md5c
, s
->keystr1
, servkey
.bytes
);
2259 MD5Update(&md5c
, ssh
->pktin
.body
, 8);
2260 MD5Final(s
->session_id
, &md5c
);
2262 for (i
= 0; i
< 32; i
++)
2263 ssh
->session_key
[i
] = random_byte();
2265 s
->len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
2267 s
->rsabuf
= smalloc(s
->len
);
2269 fatalbox("Out of memory");
2272 * Verify the host key.
2276 * First format the key into a string.
2278 int len
= rsastr_len(&hostkey
);
2279 char fingerprint
[100];
2280 char *keystr
= smalloc(len
);
2282 fatalbox("Out of memory");
2283 rsastr_fmt(keystr
, &hostkey
);
2284 rsa_fingerprint(fingerprint
, sizeof(fingerprint
), &hostkey
);
2285 verify_ssh_host_key(ssh
->savedhost
, ssh
->savedport
, "rsa", keystr
,
2290 for (i
= 0; i
< 32; i
++) {
2291 s
->rsabuf
[i
] = ssh
->session_key
[i
];
2293 s
->rsabuf
[i
] ^= s
->session_id
[i
];
2296 if (hostkey
.bytes
> servkey
.bytes
) {
2297 rsaencrypt(s
->rsabuf
, 32, &servkey
);
2298 rsaencrypt(s
->rsabuf
, servkey
.bytes
, &hostkey
);
2300 rsaencrypt(s
->rsabuf
, 32, &hostkey
);
2301 rsaencrypt(s
->rsabuf
, hostkey
.bytes
, &servkey
);
2304 logevent("Encrypted session key");
2307 int cipher_chosen
= 0, warn
= 0;
2308 char *cipher_string
= NULL
;
2310 for (i
= 0; !cipher_chosen
&& i
< CIPHER_MAX
; i
++) {
2311 int next_cipher
= cfg
.ssh_cipherlist
[i
];
2312 if (next_cipher
== CIPHER_WARN
) {
2313 /* If/when we choose a cipher, warn about it */
2315 } else if (next_cipher
== CIPHER_AES
) {
2316 /* XXX Probably don't need to mention this. */
2317 logevent("AES not supported in SSH1, skipping");
2319 switch (next_cipher
) {
2320 case CIPHER_3DES
: s
->cipher_type
= SSH_CIPHER_3DES
;
2321 cipher_string
= "3DES"; break;
2322 case CIPHER_BLOWFISH
: s
->cipher_type
= SSH_CIPHER_BLOWFISH
;
2323 cipher_string
= "Blowfish"; break;
2324 case CIPHER_DES
: s
->cipher_type
= SSH_CIPHER_DES
;
2325 cipher_string
= "single-DES"; break;
2327 if (s
->supported_ciphers_mask
& (1 << s
->cipher_type
))
2331 if (!cipher_chosen
) {
2332 if ((s
->supported_ciphers_mask
& (1 << SSH_CIPHER_3DES
)) == 0)
2333 bombout(("Server violates SSH 1 protocol by not "
2334 "supporting 3DES encryption"));
2336 /* shouldn't happen */
2337 bombout(("No supported ciphers found"));
2341 /* Warn about chosen cipher if necessary. */
2343 askcipher(cipher_string
, 0);
2346 switch (s
->cipher_type
) {
2347 case SSH_CIPHER_3DES
:
2348 logevent("Using 3DES encryption");
2350 case SSH_CIPHER_DES
:
2351 logevent("Using single-DES encryption");
2353 case SSH_CIPHER_BLOWFISH
:
2354 logevent("Using Blowfish encryption");
2358 send_packet(ssh
, SSH1_CMSG_SESSION_KEY
,
2359 PKT_CHAR
, s
->cipher_type
,
2360 PKT_DATA
, cookie
, 8,
2361 PKT_CHAR
, (s
->len
* 8) >> 8, PKT_CHAR
, (s
->len
* 8) & 0xFF,
2362 PKT_DATA
, s
->rsabuf
, s
->len
,
2363 PKT_INT
, ssh
->v1_local_protoflags
, PKT_END
);
2365 logevent("Trying to enable encryption...");
2369 ssh
->cipher
= (s
->cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish_ssh1
:
2370 s
->cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
2372 ssh
->v1_cipher_ctx
= ssh
->cipher
->make_context();
2373 ssh
->cipher
->sesskey(ssh
->v1_cipher_ctx
, ssh
->session_key
);
2376 sprintf(buf
, "Initialised %.200s encryption", ssh
->cipher
->text_name
);
2382 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
) {
2383 bombout(("Encryption not successfully enabled"));
2387 logevent("Successfully started encryption");
2391 if ((flags
& FLAG_INTERACTIVE
) && !*cfg
.username
) {
2392 if (ssh_get_line
&& !ssh_getline_pw_only
) {
2393 if (!ssh_get_line("login as: ",
2394 s
->username
, sizeof(s
->username
), FALSE
)) {
2396 * get_line failed to get a username.
2399 logevent("No username provided. Abandoning session.");
2400 ssh
->state
= SSH_STATE_CLOSED
;
2404 int ret
; /* need not be kept over crReturn */
2405 c_write_str(ssh
, "login as: ");
2408 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
2410 crWaitUntil(!ispkt
);
2411 ret
= process_userpass_input(ssh
, in
, inlen
);
2415 c_write_str(ssh
, "\r\n");
2418 strncpy(s
->username
, cfg
.username
, sizeof(s
->username
));
2419 s
->username
[sizeof(s
->username
)-1] = '\0';
2422 send_packet(ssh
, SSH1_CMSG_USER
, PKT_STR
, s
->username
, PKT_END
);
2424 char userlog
[22 + sizeof(s
->username
)];
2425 sprintf(userlog
, "Sent username \"%s\"", s
->username
);
2427 if (flags
& FLAG_INTERACTIVE
&&
2428 (!((flags
& FLAG_STDERR
) && (flags
& FLAG_VERBOSE
)))) {
2429 strcat(userlog
, "\r\n");
2430 c_write_str(ssh
, userlog
);
2437 if ((ssh
->remote_bugs
& BUG_CHOKES_ON_RSA
)) {
2438 /* We must not attempt PK auth. Pretend we've already tried it. */
2439 s
->tried_publickey
= s
->tried_agent
= 1;
2441 s
->tried_publickey
= s
->tried_agent
= 0;
2443 s
->tis_auth_refused
= s
->ccard_auth_refused
= 0;
2444 /* Load the public half of cfg.keyfile so we notice if it's in Pageant */
2446 if (!rsakey_pubblob(cfg
.keyfile
,
2447 &s
->publickey_blob
, &s
->publickey_bloblen
))
2448 s
->publickey_blob
= NULL
;
2450 s
->publickey_blob
= NULL
;
2452 while (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
2453 s
->pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
2455 if (agent_exists() && !s
->tried_agent
) {
2457 * Attempt RSA authentication using Pageant.
2463 logevent("Pageant is running. Requesting keys.");
2465 /* Request the keys held by the agent. */
2466 PUT_32BIT(s
->request
, 1);
2467 s
->request
[4] = SSH1_AGENTC_REQUEST_RSA_IDENTITIES
;
2468 agent_query(s
->request
, 5, &r
, &s
->responselen
);
2469 s
->response
= (unsigned char *) r
;
2470 if (s
->response
&& s
->responselen
>= 5 &&
2471 s
->response
[4] == SSH1_AGENT_RSA_IDENTITIES_ANSWER
) {
2472 s
->p
= s
->response
+ 5;
2473 s
->nkeys
= GET_32BIT(s
->p
);
2477 sprintf(buf
, "Pageant has %d SSH1 keys", s
->nkeys
);
2480 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
2483 sprintf(buf
, "Trying Pageant key #%d", s
->keyi
);
2486 if (s
->publickey_blob
&&
2487 !memcmp(s
->p
, s
->publickey_blob
,
2488 s
->publickey_bloblen
)) {
2489 logevent("This key matches configured key file");
2490 s
->tried_publickey
= 1;
2493 s
->p
+= ssh1_read_bignum(s
->p
, &s
->key
.exponent
);
2494 s
->p
+= ssh1_read_bignum(s
->p
, &s
->key
.modulus
);
2495 s
->commentlen
= GET_32BIT(s
->p
);
2498 s
->p
+= s
->commentlen
;
2499 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
2500 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
2502 if (ssh
->pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
2503 logevent("Key refused");
2506 logevent("Received RSA challenge");
2507 ssh1_read_bignum(ssh
->pktin
.body
, &s
->challenge
);
2509 char *agentreq
, *q
, *ret
;
2512 len
= 1 + 4; /* message type, bit count */
2513 len
+= ssh1_bignum_length(s
->key
.exponent
);
2514 len
+= ssh1_bignum_length(s
->key
.modulus
);
2515 len
+= ssh1_bignum_length(s
->challenge
);
2516 len
+= 16; /* session id */
2517 len
+= 4; /* response format */
2518 agentreq
= smalloc(4 + len
);
2519 PUT_32BIT(agentreq
, len
);
2521 *q
++ = SSH1_AGENTC_RSA_CHALLENGE
;
2522 PUT_32BIT(q
, bignum_bitcount(s
->key
.modulus
));
2524 q
+= ssh1_write_bignum(q
, s
->key
.exponent
);
2525 q
+= ssh1_write_bignum(q
, s
->key
.modulus
);
2526 q
+= ssh1_write_bignum(q
, s
->challenge
);
2527 memcpy(q
, s
->session_id
, 16);
2529 PUT_32BIT(q
, 1); /* response format */
2530 agent_query(agentreq
, len
+ 4, &vret
, &retlen
);
2534 if (ret
[4] == SSH1_AGENT_RSA_RESPONSE
) {
2535 logevent("Sending Pageant's response");
2536 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
2537 PKT_DATA
, ret
+ 5, 16,
2541 if (ssh
->pktin
.type
== SSH1_SMSG_SUCCESS
) {
2543 ("Pageant's response accepted");
2544 if (flags
& FLAG_VERBOSE
) {
2545 c_write_str(ssh
, "Authenticated using"
2547 c_write(ssh
, s
->commentp
,
2549 c_write_str(ssh
, "\" from agent\r\n");
2554 ("Pageant's response not accepted");
2557 ("Pageant failed to answer challenge");
2561 logevent("No reply received from Pageant");
2564 freebn(s
->key
.exponent
);
2565 freebn(s
->key
.modulus
);
2566 freebn(s
->challenge
);
2574 if (*cfg
.keyfile
&& !s
->tried_publickey
)
2575 s
->pwpkt_type
= SSH1_CMSG_AUTH_RSA
;
2577 if (cfg
.try_tis_auth
&&
2578 (s
->supported_auths_mask
& (1 << SSH1_AUTH_TIS
)) &&
2579 !s
->tis_auth_refused
) {
2580 s
->pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
2581 logevent("Requested TIS authentication");
2582 send_packet(ssh
, SSH1_CMSG_AUTH_TIS
, PKT_END
);
2584 if (ssh
->pktin
.type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
2585 logevent("TIS authentication declined");
2586 if (flags
& FLAG_INTERACTIVE
)
2587 c_write_str(ssh
, "TIS authentication refused.\r\n");
2588 s
->tis_auth_refused
= 1;
2591 int challengelen
= GET_32BIT(ssh
->pktin
.body
);
2592 logevent("Received TIS challenge");
2593 if (challengelen
> sizeof(s
->prompt
) - 1)
2594 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
2595 memcpy(s
->prompt
, ssh
->pktin
.body
+ 4, challengelen
);
2596 /* Prompt heuristic comes from OpenSSH */
2597 strncpy(s
->prompt
+ challengelen
,
2598 memchr(s
->prompt
, '\n', challengelen
) ?
2599 "": "\r\nResponse: ",
2600 (sizeof s
->prompt
) - challengelen
);
2601 s
->prompt
[(sizeof s
->prompt
) - 1] = '\0';
2604 if (cfg
.try_tis_auth
&&
2605 (s
->supported_auths_mask
& (1 << SSH1_AUTH_CCARD
)) &&
2606 !s
->ccard_auth_refused
) {
2607 s
->pwpkt_type
= SSH1_CMSG_AUTH_CCARD_RESPONSE
;
2608 logevent("Requested CryptoCard authentication");
2609 send_packet(ssh
, SSH1_CMSG_AUTH_CCARD
, PKT_END
);
2611 if (ssh
->pktin
.type
!= SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
2612 logevent("CryptoCard authentication declined");
2613 c_write_str(ssh
, "CryptoCard authentication refused.\r\n");
2614 s
->ccard_auth_refused
= 1;
2617 int challengelen
= GET_32BIT(ssh
->pktin
.body
);
2618 logevent("Received CryptoCard challenge");
2619 if (challengelen
> sizeof(s
->prompt
) - 1)
2620 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
2621 memcpy(s
->prompt
, ssh
->pktin
.body
+ 4, challengelen
);
2622 strncpy(s
->prompt
+ challengelen
,
2623 memchr(s
->prompt
, '\n', challengelen
) ?
2624 "" : "\r\nResponse: ",
2625 sizeof(s
->prompt
) - challengelen
);
2626 s
->prompt
[sizeof(s
->prompt
) - 1] = '\0';
2629 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
2630 sprintf(s
->prompt
, "%.90s@%.90s's password: ",
2631 s
->username
, ssh
->savedhost
);
2633 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
2634 char *comment
= NULL
;
2637 if (flags
& FLAG_VERBOSE
)
2638 c_write_str(ssh
, "Trying public key authentication.\r\n");
2639 sprintf(msgbuf
, "Trying public key \"%.200s\"", cfg
.keyfile
);
2641 type
= key_type(cfg
.keyfile
);
2642 if (type
!= SSH_KEYTYPE_SSH1
) {
2643 sprintf(msgbuf
, "Key is of wrong type (%s)",
2644 key_type_to_str(type
));
2646 c_write_str(ssh
, msgbuf
);
2647 c_write_str(ssh
, "\r\n");
2648 s
->tried_publickey
= 1;
2651 if (!rsakey_encrypted(cfg
.keyfile
, &comment
)) {
2652 if (flags
& FLAG_VERBOSE
)
2653 c_write_str(ssh
, "No passphrase required.\r\n");
2656 sprintf(s
->prompt
, "Passphrase for key \"%.100s\": ", comment
);
2661 * Show password prompt, having first obtained it via a TIS
2662 * or CryptoCard exchange if we're doing TIS or CryptoCard
2666 if (!ssh_get_line(s
->prompt
, s
->password
,
2667 sizeof(s
->password
), TRUE
)) {
2669 * get_line failed to get a password (for example
2670 * because one was supplied on the command line
2671 * which has already failed to work). Terminate.
2673 send_packet(ssh
, SSH1_MSG_DISCONNECT
,
2674 PKT_STR
, "No more passwords available to try",
2676 logevent("Unable to authenticate");
2677 connection_fatal("Unable to authenticate");
2678 ssh
->state
= SSH_STATE_CLOSED
;
2682 /* Prompt may have come from server. We've munged it a bit, so
2683 * we know it to be zero-terminated at least once. */
2684 int ret
; /* need not be saved over crReturn */
2685 c_write_untrusted(ssh
, s
->prompt
, strlen(s
->prompt
));
2688 setup_userpass_input(ssh
, s
->password
, sizeof(s
->password
), 0);
2690 crWaitUntil(!ispkt
);
2691 ret
= process_userpass_input(ssh
, in
, inlen
);
2695 c_write_str(ssh
, "\r\n");
2699 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
2701 * Try public key authentication with the specified
2704 s
->tried_publickey
= 1;
2707 int ret
= loadrsakey(cfg
.keyfile
, &s
->key
, s
->password
);
2709 c_write_str(ssh
, "Couldn't load private key from ");
2710 c_write_str(ssh
, cfg
.keyfile
);
2711 c_write_str(ssh
, ".\r\n");
2712 continue; /* go and try password */
2715 c_write_str(ssh
, "Wrong passphrase.\r\n");
2716 s
->tried_publickey
= 0;
2717 continue; /* try again */
2722 * Send a public key attempt.
2724 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
2725 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
2728 if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
2729 c_write_str(ssh
, "Server refused our public key.\r\n");
2730 continue; /* go and try password */
2732 if (ssh
->pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
2733 bombout(("Bizarre response to offer of public key"));
2739 unsigned char buffer
[32];
2740 Bignum challenge
, response
;
2742 ssh1_read_bignum(ssh
->pktin
.body
, &challenge
);
2743 response
= rsadecrypt(challenge
, &s
->key
);
2744 freebn(s
->key
.private_exponent
);/* burn the evidence */
2746 for (i
= 0; i
< 32; i
++) {
2747 buffer
[i
] = bignum_byte(response
, 31 - i
);
2751 MD5Update(&md5c
, buffer
, 32);
2752 MD5Update(&md5c
, s
->session_id
, 16);
2753 MD5Final(buffer
, &md5c
);
2755 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
2756 PKT_DATA
, buffer
, 16, PKT_END
);
2763 if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
2764 if (flags
& FLAG_VERBOSE
)
2765 c_write_str(ssh
, "Failed to authenticate with"
2766 " our public key.\r\n");
2767 continue; /* go and try password */
2768 } else if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
) {
2769 bombout(("Bizarre response to RSA authentication response"));
2773 break; /* we're through! */
2775 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
2777 * Defence against traffic analysis: we send a
2778 * whole bunch of packets containing strings of
2779 * different lengths. One of these strings is the
2780 * password, in a SSH1_CMSG_AUTH_PASSWORD packet.
2781 * The others are all random data in
2782 * SSH1_MSG_IGNORE packets. This way a passive
2783 * listener can't tell which is the password, and
2784 * hence can't deduce the password length.
2786 * Anybody with a password length greater than 16
2787 * bytes is going to have enough entropy in their
2788 * password that a listener won't find it _that_
2789 * much help to know how long it is. So what we'll
2792 * - if password length < 16, we send 15 packets
2793 * containing string lengths 1 through 15
2795 * - otherwise, we let N be the nearest multiple
2796 * of 8 below the password length, and send 8
2797 * packets containing string lengths N through
2798 * N+7. This won't obscure the order of
2799 * magnitude of the password length, but it will
2800 * introduce a bit of extra uncertainty.
2802 * A few servers (the old 1.2.18 through 1.2.22)
2803 * can't deal with SSH1_MSG_IGNORE. For these
2804 * servers, we need an alternative defence. We make
2805 * use of the fact that the password is interpreted
2806 * as a C string: so we can append a NUL, then some
2809 * One server (a Cisco one) can deal with neither
2810 * SSH1_MSG_IGNORE _nor_ a padded password string.
2811 * For this server we are left with no defences
2812 * against password length sniffing.
2814 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
)) {
2816 * The server can deal with SSH1_MSG_IGNORE, so
2817 * we can use the primary defence.
2819 int bottom
, top
, pwlen
, i
;
2822 pwlen
= strlen(s
->password
);
2824 bottom
= 0; /* zero length passwords are OK! :-) */
2827 bottom
= pwlen
& ~7;
2831 assert(pwlen
>= bottom
&& pwlen
<= top
);
2833 randomstr
= smalloc(top
+ 1);
2835 for (i
= bottom
; i
<= top
; i
++) {
2837 defer_packet(ssh
, s
->pwpkt_type
,
2838 PKT_STR
, s
->password
, PKT_END
);
2840 for (j
= 0; j
< i
; j
++) {
2842 randomstr
[j
] = random_byte();
2843 } while (randomstr
[j
] == '\0');
2845 randomstr
[i
] = '\0';
2846 defer_packet(ssh
, SSH1_MSG_IGNORE
,
2847 PKT_STR
, randomstr
, PKT_END
);
2850 logevent("Sending password with camouflage packets");
2851 ssh_pkt_defersend(ssh
);
2853 else if (!(ssh
->remote_bugs
& BUG_NEEDS_SSH1_PLAIN_PASSWORD
)) {
2855 * The server can't deal with SSH1_MSG_IGNORE
2856 * but can deal with padded passwords, so we
2857 * can use the secondary defence.
2863 len
= strlen(s
->password
);
2864 if (len
< sizeof(string
)) {
2866 strcpy(string
, s
->password
);
2867 len
++; /* cover the zero byte */
2868 while (len
< sizeof(string
)) {
2869 string
[len
++] = (char) random_byte();
2874 logevent("Sending length-padded password");
2875 send_packet(ssh
, s
->pwpkt_type
, PKT_INT
, len
,
2876 PKT_DATA
, ss
, len
, PKT_END
);
2879 * The server has _both_
2880 * BUG_CHOKES_ON_SSH1_IGNORE and
2881 * BUG_NEEDS_SSH1_PLAIN_PASSWORD. There is
2882 * therefore nothing we can do.
2885 len
= strlen(s
->password
);
2886 logevent("Sending unpadded password");
2887 send_packet(ssh
, s
->pwpkt_type
, PKT_INT
, len
,
2888 PKT_DATA
, s
->password
, len
, PKT_END
);
2891 send_packet(ssh
, s
->pwpkt_type
, PKT_STR
, s
->password
, PKT_END
);
2894 logevent("Sent password");
2895 memset(s
->password
, 0, strlen(s
->password
));
2897 if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
2898 if (flags
& FLAG_VERBOSE
)
2899 c_write_str(ssh
, "Access denied\r\n");
2900 logevent("Authentication refused");
2901 } else if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
) {
2902 bombout(("Strange packet received, type %d", ssh
->pktin
.type
));
2907 logevent("Authentication successful");
2912 void sshfwd_close(struct ssh_channel
*c
)
2916 if (c
&& !c
->closes
) {
2918 * If the channel's remoteid is -1, we have sent
2919 * CHANNEL_OPEN for this channel, but it hasn't even been
2920 * acknowledged by the server. So we must set a close flag
2921 * on it now, and then when the server acks the channel
2922 * open, we can close it then.
2924 if (((int)c
->remoteid
) != -1) {
2925 if (ssh
->version
== 1) {
2926 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
, PKT_INT
, c
->remoteid
,
2929 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_CLOSE
);
2930 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
2934 c
->closes
= 1; /* sent MSG_CLOSE */
2935 if (c
->type
== CHAN_X11
) {
2937 logevent("Forwarded X11 connection terminated");
2938 } else if (c
->type
== CHAN_SOCKDATA
||
2939 c
->type
== CHAN_SOCKDATA_DORMANT
) {
2941 logevent("Forwarded port closed");
2946 int sshfwd_write(struct ssh_channel
*c
, char *buf
, int len
)
2950 if (ssh
->version
== 1) {
2951 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
2952 PKT_INT
, c
->remoteid
,
2953 PKT_INT
, len
, PKT_DATA
, buf
, len
, PKT_END
);
2955 * In SSH1 we can return 0 here - implying that forwarded
2956 * connections are never individually throttled - because
2957 * the only circumstance that can cause throttling will be
2958 * the whole SSH connection backing up, in which case
2959 * _everything_ will be throttled as a whole.
2963 ssh2_add_channel_data(c
, buf
, len
);
2964 return ssh2_try_send(c
);
2968 void sshfwd_unthrottle(struct ssh_channel
*c
, int bufsize
)
2972 if (ssh
->version
== 1) {
2973 if (c
->v
.v1
.throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
2974 c
->v
.v1
.throttling
= 0;
2975 ssh1_throttle(ssh
, -1);
2978 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
2982 static void ssh1_protocol(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
2984 crBegin(ssh
->ssh1_protocol_crstate
);
2988 while (!do_ssh1_login(ssh
, in
, inlen
, ispkt
)) {
2991 if (ssh
->state
== SSH_STATE_CLOSED
)
2994 if (cfg
.agentfwd
&& agent_exists()) {
2995 logevent("Requesting agent forwarding");
2996 send_packet(ssh
, SSH1_CMSG_AGENT_REQUEST_FORWARDING
, PKT_END
);
3000 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3001 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3002 bombout(("Protocol confusion"));
3004 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3005 logevent("Agent forwarding refused");
3007 logevent("Agent forwarding enabled");
3008 ssh
->agentfwd_enabled
= TRUE
;
3012 if (cfg
.x11_forward
) {
3013 char proto
[20], data
[64];
3014 logevent("Requesting X11 forwarding");
3015 x11_invent_auth(proto
, sizeof(proto
), data
, sizeof(data
));
3016 if (ssh
->v1_local_protoflags
& SSH1_PROTOFLAG_SCREEN_NUMBER
) {
3017 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
3018 PKT_STR
, proto
, PKT_STR
, data
,
3019 PKT_INT
, 0, PKT_END
);
3021 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
3022 PKT_STR
, proto
, PKT_STR
, data
, PKT_END
);
3027 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3028 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3029 bombout(("Protocol confusion"));
3031 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3032 logevent("X11 forwarding refused");
3034 logevent("X11 forwarding enabled");
3035 ssh
->X11_fwd_enabled
= TRUE
;
3042 int sport
,dport
,sserv
,dserv
;
3043 char sports
[256], dports
[256], host
[256];
3047 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh1
);
3048 /* Add port forwardings. */
3049 ssh
->portfwd_strptr
= cfg
.portfwd
;
3050 while (*ssh
->portfwd_strptr
) {
3051 type
= *ssh
->portfwd_strptr
++;
3053 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= '\t')
3054 sports
[n
++] = *ssh
->portfwd_strptr
++;
3056 if (*ssh
->portfwd_strptr
== '\t')
3057 ssh
->portfwd_strptr
++;
3059 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= ':')
3060 host
[n
++] = *ssh
->portfwd_strptr
++;
3062 if (*ssh
->portfwd_strptr
== ':')
3063 ssh
->portfwd_strptr
++;
3065 while (*ssh
->portfwd_strptr
)
3066 dports
[n
++] = *ssh
->portfwd_strptr
++;
3068 ssh
->portfwd_strptr
++;
3069 dport
= atoi(dports
);
3073 se
= getservbyname(dports
, NULL
);
3075 dport
= ntohs(se
->s_port
);
3078 "Service lookup failed for destination port \"%s\"",
3083 sport
= atoi(sports
);
3087 se
= getservbyname(sports
, NULL
);
3089 sport
= ntohs(se
->s_port
);
3092 "Service lookup failed for source port \"%s\"",
3097 if (sport
&& dport
) {
3099 pfd_addforward(host
, dport
, sport
);
3100 sprintf(buf
, "Local port %.*s%.*s%d%.*s forwarding to"
3101 " %s:%.*s%.*s%d%.*s",
3102 sserv ?
strlen(sports
) : 0, sports
,
3103 sserv
, "(", sport
, sserv
, ")",
3105 dserv ?
strlen(dports
) : 0, dports
,
3106 dserv
, "(", dport
, dserv
, ")");
3109 struct ssh_rportfwd
*pf
;
3110 pf
= smalloc(sizeof(*pf
));
3111 strcpy(pf
->dhost
, host
);
3113 if (add234(ssh
->rportfwds
, pf
) != pf
) {
3115 "Duplicate remote port forwarding to %s:%d",
3120 sprintf(buf
, "Requesting remote port %.*s%.*s%d%.*s"
3121 " forward to %s:%.*s%.*s%d%.*s",
3122 sserv ?
strlen(sports
) : 0, sports
,
3123 sserv
, "(", sport
, sserv
, ")",
3125 dserv ?
strlen(dports
) : 0, dports
,
3126 dserv
, "(", dport
, dserv
, ")");
3128 send_packet(ssh
, SSH1_CMSG_PORT_FORWARD_REQUEST
,
3136 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3137 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3138 bombout(("Protocol confusion"));
3140 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3141 c_write_str(ssh
, "Server refused port"
3144 logevent("Remote port forwarding enabled");
3152 send_packet(ssh
, SSH1_CMSG_REQUEST_PTY
,
3153 PKT_STR
, cfg
.termtype
,
3154 PKT_INT
, ssh
->term_height
,
3155 PKT_INT
, ssh
->term_width
,
3156 PKT_INT
, 0, PKT_INT
, 0, PKT_CHAR
, 0, PKT_END
);
3157 ssh
->state
= SSH_STATE_INTERMED
;
3161 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3162 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3163 bombout(("Protocol confusion"));
3165 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3166 c_write_str(ssh
, "Server refused to allocate pty\r\n");
3167 ssh
->editing
= ssh
->echoing
= 1;
3169 logevent("Allocated pty");
3171 ssh
->editing
= ssh
->echoing
= 1;
3174 if (cfg
.compression
) {
3175 send_packet(ssh
, SSH1_CMSG_REQUEST_COMPRESSION
, PKT_INT
, 6, PKT_END
);
3179 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3180 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3181 bombout(("Protocol confusion"));
3183 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3184 c_write_str(ssh
, "Server refused to compress\r\n");
3186 logevent("Started compression");
3187 ssh
->v1_compressing
= TRUE
;
3188 zlib_compress_init();
3189 zlib_decompress_init();
3193 * Start the shell or command.
3195 * Special case: if the first-choice command is an SSH2
3196 * subsystem (hence not usable here) and the second choice
3197 * exists, we fall straight back to that.
3200 char *cmd
= cfg
.remote_cmd_ptr
;
3202 if (cfg
.ssh_subsys
&& cfg
.remote_cmd_ptr2
) {
3203 cmd
= cfg
.remote_cmd_ptr2
;
3204 ssh
->fallback_cmd
= TRUE
;
3207 send_packet(ssh
, SSH1_CMSG_EXEC_CMD
, PKT_STR
, cmd
, PKT_END
);
3209 send_packet(ssh
, SSH1_CMSG_EXEC_SHELL
, PKT_END
);
3210 logevent("Started session");
3213 ssh
->state
= SSH_STATE_SESSION
;
3214 if (ssh
->size_needed
)
3215 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
3216 if (ssh
->eof_needed
)
3217 ssh_special(ssh
, TS_EOF
);
3219 ldisc_send(NULL
, 0, 0); /* cause ldisc to notice changes */
3221 ssh
->channels
= newtree234(ssh_channelcmp
);
3225 if (ssh
->pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
3226 ssh
->pktin
.type
== SSH1_SMSG_STDERR_DATA
) {
3227 long len
= GET_32BIT(ssh
->pktin
.body
);
3229 from_backend(ssh
->frontend
,
3230 ssh
->pktin
.type
== SSH1_SMSG_STDERR_DATA
,
3231 ssh
->pktin
.body
+ 4, len
);
3232 if (!ssh
->v1_stdout_throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
3233 ssh
->v1_stdout_throttling
= 1;
3234 ssh1_throttle(ssh
, +1);
3236 } else if (ssh
->pktin
.type
== SSH1_MSG_DISCONNECT
) {
3237 ssh
->state
= SSH_STATE_CLOSED
;
3238 logevent("Received disconnect request");
3240 } else if (ssh
->pktin
.type
== SSH1_SMSG_X11_OPEN
) {
3241 /* Remote side is trying to open a channel to talk to our
3242 * X-Server. Give them back a local channel number. */
3243 struct ssh_channel
*c
;
3245 logevent("Received X11 connect request");
3246 /* Refuse if X11 forwarding is disabled. */
3247 if (!ssh
->X11_fwd_enabled
) {
3248 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3249 PKT_INT
, GET_32BIT(ssh
->pktin
.body
), PKT_END
);
3250 logevent("Rejected X11 connect request");
3252 c
= smalloc(sizeof(struct ssh_channel
));
3255 if (x11_init(&c
->u
.x11
.s
, cfg
.x11_display
, c
) != NULL
) {
3256 logevent("opening X11 forward connection failed");
3258 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3259 PKT_INT
, GET_32BIT(ssh
->pktin
.body
),
3263 ("opening X11 forward connection succeeded");
3264 c
->remoteid
= GET_32BIT(ssh
->pktin
.body
);
3265 c
->localid
= alloc_channel_id(ssh
);
3267 c
->v
.v1
.throttling
= 0;
3268 c
->type
= CHAN_X11
; /* identify channel type */
3269 add234(ssh
->channels
, c
);
3270 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3271 PKT_INT
, c
->remoteid
, PKT_INT
,
3272 c
->localid
, PKT_END
);
3273 logevent("Opened X11 forward channel");
3276 } else if (ssh
->pktin
.type
== SSH1_SMSG_AGENT_OPEN
) {
3277 /* Remote side is trying to open a channel to talk to our
3278 * agent. Give them back a local channel number. */
3279 struct ssh_channel
*c
;
3281 /* Refuse if agent forwarding is disabled. */
3282 if (!ssh
->agentfwd_enabled
) {
3283 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3284 PKT_INT
, GET_32BIT(ssh
->pktin
.body
), PKT_END
);
3286 c
= smalloc(sizeof(struct ssh_channel
));
3288 c
->remoteid
= GET_32BIT(ssh
->pktin
.body
);
3289 c
->localid
= alloc_channel_id(ssh
);
3291 c
->v
.v1
.throttling
= 0;
3292 c
->type
= CHAN_AGENT
; /* identify channel type */
3293 c
->u
.a
.lensofar
= 0;
3294 add234(ssh
->channels
, c
);
3295 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3296 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
3299 } else if (ssh
->pktin
.type
== SSH1_MSG_PORT_OPEN
) {
3300 /* Remote side is trying to open a channel to talk to a
3301 * forwarded port. Give them back a local channel number. */
3302 struct ssh_channel
*c
;
3303 struct ssh_rportfwd pf
;
3305 char host
[256], buf
[1024];
3307 c
= smalloc(sizeof(struct ssh_channel
));
3310 hostsize
= GET_32BIT(ssh
->pktin
.body
+4);
3311 for(h
= host
, p
= ssh
->pktin
.body
+8; hostsize
!= 0; hostsize
--) {
3312 if (h
+1 < host
+sizeof(host
))
3317 port
= GET_32BIT(p
);
3319 strcpy(pf
.dhost
, host
);
3322 if (find234(ssh
->rportfwds
, &pf
, NULL
) == NULL
) {
3323 sprintf(buf
, "Rejected remote port open request for %s:%d",
3326 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3327 PKT_INT
, GET_32BIT(ssh
->pktin
.body
), PKT_END
);
3329 sprintf(buf
, "Received remote port open request for %s:%d",
3332 e
= pfd_newconnect(&c
->u
.pfd
.s
, host
, port
, c
);
3335 sprintf(buf
, "Port open failed: %s", e
);
3338 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3339 PKT_INT
, GET_32BIT(ssh
->pktin
.body
),
3342 c
->remoteid
= GET_32BIT(ssh
->pktin
.body
);
3343 c
->localid
= alloc_channel_id(ssh
);
3345 c
->v
.v1
.throttling
= 0;
3346 c
->type
= CHAN_SOCKDATA
; /* identify channel type */
3347 add234(ssh
->channels
, c
);
3348 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3349 PKT_INT
, c
->remoteid
, PKT_INT
,
3350 c
->localid
, PKT_END
);
3351 logevent("Forwarded port opened successfully");
3355 } else if (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
) {
3356 unsigned int remoteid
= GET_32BIT(ssh
->pktin
.body
);
3357 unsigned int localid
= GET_32BIT(ssh
->pktin
.body
+4);
3358 struct ssh_channel
*c
;
3360 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
3361 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
3362 c
->remoteid
= localid
;
3363 c
->type
= CHAN_SOCKDATA
;
3364 c
->v
.v1
.throttling
= 0;
3365 pfd_confirm(c
->u
.pfd
.s
);
3368 if (c
&& c
->closes
) {
3370 * We have a pending close on this channel,
3371 * which we decided on before the server acked
3372 * the channel open. So now we know the
3373 * remoteid, we can close it again.
3375 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
,
3376 PKT_INT
, c
->remoteid
, PKT_END
);
3379 } else if (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_OPEN_FAILURE
) {
3380 unsigned int remoteid
= GET_32BIT(ssh
->pktin
.body
);
3381 unsigned int localid
= GET_32BIT(ssh
->pktin
.body
+4);
3382 struct ssh_channel
*c
;
3384 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
3385 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
3386 logevent("Forwarded connection refused by server");
3387 pfd_close(c
->u
.pfd
.s
);
3388 del234(ssh
->channels
, c
);
3392 } else if (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_CLOSE
||
3393 ssh
->pktin
.type
== SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
) {
3394 /* Remote side closes a channel. */
3395 unsigned i
= GET_32BIT(ssh
->pktin
.body
);
3396 struct ssh_channel
*c
;
3397 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
3398 if (c
&& ((int)c
->remoteid
) != -1) {
3401 (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_CLOSE ?
1 : 2);
3403 if ((c
->closes
== 0) && (c
->type
== CHAN_X11
)) {
3404 logevent("Forwarded X11 connection terminated");
3405 assert(c
->u
.x11
.s
!= NULL
);
3406 x11_close(c
->u
.x11
.s
);
3409 if ((c
->closes
== 0) && (c
->type
== CHAN_SOCKDATA
)) {
3410 logevent("Forwarded port closed");
3411 assert(c
->u
.pfd
.s
!= NULL
);
3412 pfd_close(c
->u
.pfd
.s
);
3416 c
->closes
|= (closetype
<< 2); /* seen this message */
3417 if (!(c
->closes
& closetype
)) {
3418 send_packet(ssh
, ssh
->pktin
.type
, PKT_INT
, c
->remoteid
,
3420 c
->closes
|= closetype
; /* sent it too */
3423 if (c
->closes
== 15) {
3424 del234(ssh
->channels
, c
);
3428 bombout(("Received CHANNEL_CLOSE%s for %s channel %d\n",
3429 ssh
->pktin
.type
== SSH1_MSG_CHANNEL_CLOSE ?
"" :
3430 "_CONFIRMATION", c ?
"half-open" : "nonexistent",
3433 } else if (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_DATA
) {
3434 /* Data sent down one of our channels. */
3435 int i
= GET_32BIT(ssh
->pktin
.body
);
3436 int len
= GET_32BIT(ssh
->pktin
.body
+ 4);
3437 unsigned char *p
= ssh
->pktin
.body
+ 8;
3438 struct ssh_channel
*c
;
3439 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
3444 bufsize
= x11_send(c
->u
.x11
.s
, p
, len
);
3447 bufsize
= pfd_send(c
->u
.pfd
.s
, p
, len
);
3450 /* Data for an agent message. Buffer it. */
3452 if (c
->u
.a
.lensofar
< 4) {
3453 int l
= min(4 - c
->u
.a
.lensofar
, len
);
3454 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
, p
,
3458 c
->u
.a
.lensofar
+= l
;
3460 if (c
->u
.a
.lensofar
== 4) {
3462 4 + GET_32BIT(c
->u
.a
.msglen
);
3463 c
->u
.a
.message
= smalloc(c
->u
.a
.totallen
);
3464 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
3466 if (c
->u
.a
.lensofar
>= 4 && len
> 0) {
3468 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
3470 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
, p
,
3474 c
->u
.a
.lensofar
+= l
;
3476 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
3477 void *reply
, *sentreply
;
3479 agent_query(c
->u
.a
.message
,
3480 c
->u
.a
.totallen
, &reply
,
3485 /* Fake SSH_AGENT_FAILURE. */
3486 sentreply
= "\0\0\0\1\5";
3489 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
3490 PKT_INT
, c
->remoteid
,
3492 PKT_DATA
, sentreply
, replylen
,
3496 sfree(c
->u
.a
.message
);
3497 c
->u
.a
.lensofar
= 0;
3500 bufsize
= 0; /* agent channels never back up */
3503 if (!c
->v
.v1
.throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
3504 c
->v
.v1
.throttling
= 1;
3505 ssh1_throttle(ssh
, +1);
3508 } else if (ssh
->pktin
.type
== SSH1_SMSG_SUCCESS
) {
3509 /* may be from EXEC_SHELL on some servers */
3510 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3511 /* may be from EXEC_SHELL on some servers
3512 * if no pty is available or in other odd cases. Ignore */
3513 } else if (ssh
->pktin
.type
== SSH1_SMSG_EXIT_STATUS
) {
3515 ssh
->exitcode
= GET_32BIT(ssh
->pktin
.body
);
3516 sprintf(buf
, "Server sent command exit status %d",
3519 send_packet(ssh
, SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
3521 * In case `helpful' firewalls or proxies tack
3522 * extra human-readable text on the end of the
3523 * session which we might mistake for another
3524 * encrypted packet, we close the session once
3525 * we've sent EXIT_CONFIRMATION.
3527 ssh
->state
= SSH_STATE_CLOSED
;
3530 bombout(("Strange packet received: type %d", ssh
->pktin
.type
));
3535 int len
= min(inlen
, 512);
3536 send_packet(ssh
, SSH1_CMSG_STDIN_DATA
,
3537 PKT_INT
, len
, PKT_DATA
, in
, len
, PKT_END
);
3548 * Utility routine for decoding comma-separated strings in KEXINIT.
3550 static int in_commasep_string(char *needle
, char *haystack
, int haylen
)
3552 int needlen
= strlen(needle
);
3555 * Is it at the start of the string?
3557 if (haylen
>= needlen
&& /* haystack is long enough */
3558 !memcmp(needle
, haystack
, needlen
) && /* initial match */
3559 (haylen
== needlen
|| haystack
[needlen
] == ',')
3560 /* either , or EOS follows */
3564 * If not, search for the next comma and resume after that.
3565 * If no comma found, terminate.
3567 while (haylen
> 0 && *haystack
!= ',')
3568 haylen
--, haystack
++;
3571 haylen
--, haystack
++; /* skip over comma itself */
3576 * SSH2 key creation method.
3578 static void ssh2_mkkey(Ssh ssh
, Bignum K
, char *H
, char *sessid
, char chr
,
3582 /* First 20 bytes. */
3584 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
3586 SHA_Bytes(&s
, H
, 20);
3587 SHA_Bytes(&s
, &chr
, 1);
3588 SHA_Bytes(&s
, sessid
, 20);
3589 SHA_Final(&s
, keyspace
);
3590 /* Next 20 bytes. */
3592 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
3594 SHA_Bytes(&s
, H
, 20);
3595 SHA_Bytes(&s
, keyspace
, 20);
3596 SHA_Final(&s
, keyspace
+ 20);
3600 * Handle the SSH2 transport layer.
3602 static int do_ssh2_transport(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
3604 struct do_ssh2_transport_state
{
3605 int nbits
, pbits
, warn
;
3606 Bignum p
, g
, e
, f
, K
;
3607 int kex_init_value
, kex_reply_value
;
3608 const struct ssh_mac
**maclist
;
3610 const struct ssh2_cipher
*cscipher_tobe
;
3611 const struct ssh2_cipher
*sccipher_tobe
;
3612 const struct ssh_mac
*csmac_tobe
;
3613 const struct ssh_mac
*scmac_tobe
;
3614 const struct ssh_compress
*cscomp_tobe
;
3615 const struct ssh_compress
*sccomp_tobe
;
3616 char *hostkeydata
, *sigdata
, *keystr
, *fingerprint
;
3617 int hostkeylen
, siglen
;
3618 void *hkey
; /* actual host key */
3619 unsigned char exchange_hash
[20];
3620 int n_preferred_ciphers
;
3621 const struct ssh2_ciphers
*preferred_ciphers
[CIPHER_MAX
];
3622 const struct ssh_compress
*preferred_comp
;
3625 crState(do_ssh2_transport_state
);
3627 crBegin(ssh
->do_ssh2_transport_crstate
);
3629 s
->cscipher_tobe
= s
->sccipher_tobe
= NULL
;
3630 s
->csmac_tobe
= s
->scmac_tobe
= NULL
;
3631 s
->cscomp_tobe
= s
->sccomp_tobe
= NULL
;
3639 * Set up the preferred ciphers. (NULL => warn below here)
3641 s
->n_preferred_ciphers
= 0;
3642 for (i
= 0; i
< CIPHER_MAX
; i
++) {
3643 switch (cfg
.ssh_cipherlist
[i
]) {
3644 case CIPHER_BLOWFISH
:
3645 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_blowfish
;
3648 if (cfg
.ssh2_des_cbc
) {
3649 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_des
;
3653 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_3des
;
3656 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_aes
;
3659 /* Flag for later. Don't bother if it's the last in
3661 if (i
< CIPHER_MAX
- 1) {
3662 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = NULL
;
3670 * Set up preferred compression.
3672 if (cfg
.compression
)
3673 s
->preferred_comp
= &ssh_zlib
;
3675 s
->preferred_comp
= &ssh_comp_none
;
3678 * Be prepared to work around the buggy MAC problem.
3680 if (ssh
->remote_bugs
& BUG_SSH2_HMAC
)
3681 s
->maclist
= buggymacs
, s
->nmacs
= lenof(buggymacs
);
3683 s
->maclist
= macs
, s
->nmacs
= lenof(macs
);
3687 int i
, j
, cipherstr_started
;
3690 * Construct and send our key exchange packet.
3692 ssh2_pkt_init(ssh
, SSH2_MSG_KEXINIT
);
3693 for (i
= 0; i
< 16; i
++)
3694 ssh2_pkt_addbyte(ssh
, (unsigned char) random_byte());
3695 /* List key exchange algorithms. */
3696 ssh2_pkt_addstring_start(ssh
);
3697 for (i
= 0; i
< lenof(kex_algs
); i
++) {
3698 if (kex_algs
[i
] == &ssh_diffiehellman_gex
&&
3699 (ssh
->remote_bugs
& BUG_SSH2_DH_GEX
))
3701 ssh2_pkt_addstring_str(ssh
, kex_algs
[i
]->name
);
3702 if (i
< lenof(kex_algs
) - 1)
3703 ssh2_pkt_addstring_str(ssh
, ",");
3705 /* List server host key algorithms. */
3706 ssh2_pkt_addstring_start(ssh
);
3707 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
3708 ssh2_pkt_addstring_str(ssh
, hostkey_algs
[i
]->name
);
3709 if (i
< lenof(hostkey_algs
) - 1)
3710 ssh2_pkt_addstring_str(ssh
, ",");
3712 /* List client->server encryption algorithms. */
3713 ssh2_pkt_addstring_start(ssh
);
3714 cipherstr_started
= 0;
3715 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
3716 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
3717 if (!c
) continue; /* warning flag */
3718 for (j
= 0; j
< c
->nciphers
; j
++) {
3719 if (cipherstr_started
)
3720 ssh2_pkt_addstring_str(ssh
, ",");
3721 ssh2_pkt_addstring_str(ssh
, c
->list
[j
]->name
);
3722 cipherstr_started
= 1;
3725 /* List server->client encryption algorithms. */
3726 ssh2_pkt_addstring_start(ssh
);
3727 cipherstr_started
= 0;
3728 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
3729 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
3730 if (!c
) continue; /* warning flag */
3731 for (j
= 0; j
< c
->nciphers
; j
++) {
3732 if (cipherstr_started
)
3733 ssh2_pkt_addstring_str(ssh
, ",");
3734 ssh2_pkt_addstring_str(ssh
, c
->list
[j
]->name
);
3735 cipherstr_started
= 1;
3738 /* List client->server MAC algorithms. */
3739 ssh2_pkt_addstring_start(ssh
);
3740 for (i
= 0; i
< s
->nmacs
; i
++) {
3741 ssh2_pkt_addstring_str(ssh
, s
->maclist
[i
]->name
);
3742 if (i
< s
->nmacs
- 1)
3743 ssh2_pkt_addstring_str(ssh
, ",");
3745 /* List server->client MAC algorithms. */
3746 ssh2_pkt_addstring_start(ssh
);
3747 for (i
= 0; i
< s
->nmacs
; i
++) {
3748 ssh2_pkt_addstring_str(ssh
, s
->maclist
[i
]->name
);
3749 if (i
< s
->nmacs
- 1)
3750 ssh2_pkt_addstring_str(ssh
, ",");
3752 /* List client->server compression algorithms. */
3753 ssh2_pkt_addstring_start(ssh
);
3754 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
3755 const struct ssh_compress
*c
=
3756 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
3757 ssh2_pkt_addstring_str(ssh
, c
->name
);
3758 if (i
< lenof(compressions
))
3759 ssh2_pkt_addstring_str(ssh
, ",");
3761 /* List server->client compression algorithms. */
3762 ssh2_pkt_addstring_start(ssh
);
3763 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
3764 const struct ssh_compress
*c
=
3765 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
3766 ssh2_pkt_addstring_str(ssh
, c
->name
);
3767 if (i
< lenof(compressions
))
3768 ssh2_pkt_addstring_str(ssh
, ",");
3770 /* List client->server languages. Empty list. */
3771 ssh2_pkt_addstring_start(ssh
);
3772 /* List server->client languages. Empty list. */
3773 ssh2_pkt_addstring_start(ssh
);
3774 /* First KEX packet does _not_ follow, because we're not that brave. */
3775 ssh2_pkt_addbool(ssh
, FALSE
);
3777 ssh2_pkt_adduint32(ssh
, 0);
3780 ssh
->exhash
= ssh
->exhashbase
;
3781 sha_string(&ssh
->exhash
, ssh
->pktout
.data
+ 5, ssh
->pktout
.length
- 5);
3787 sha_string(&ssh
->exhash
, ssh
->pktin
.data
+ 5, ssh
->pktin
.length
- 5);
3790 * Now examine the other side's KEXINIT to see what we're up
3797 if (ssh
->pktin
.type
!= SSH2_MSG_KEXINIT
) {
3798 bombout(("expected key exchange packet from server"));
3802 ssh
->hostkey
= NULL
;
3803 s
->cscipher_tobe
= NULL
;
3804 s
->sccipher_tobe
= NULL
;
3805 s
->csmac_tobe
= NULL
;
3806 s
->scmac_tobe
= NULL
;
3807 s
->cscomp_tobe
= NULL
;
3808 s
->sccomp_tobe
= NULL
;
3809 ssh
->pktin
.savedpos
+= 16; /* skip garbage cookie */
3810 ssh2_pkt_getstring(ssh
, &str
, &len
); /* key exchange algorithms */
3811 for (i
= 0; i
< lenof(kex_algs
); i
++) {
3812 if (kex_algs
[i
] == &ssh_diffiehellman_gex
&&
3813 (ssh
->remote_bugs
& BUG_SSH2_DH_GEX
))
3815 if (in_commasep_string(kex_algs
[i
]->name
, str
, len
)) {
3816 ssh
->kex
= kex_algs
[i
];
3820 ssh2_pkt_getstring(ssh
, &str
, &len
); /* host key algorithms */
3821 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
3822 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
3823 ssh
->hostkey
= hostkey_algs
[i
];
3827 ssh2_pkt_getstring(ssh
, &str
, &len
); /* client->server cipher */
3829 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
3830 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
3834 for (j
= 0; j
< c
->nciphers
; j
++) {
3835 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
3836 s
->cscipher_tobe
= c
->list
[j
];
3841 if (s
->cscipher_tobe
) {
3843 askcipher(s
->cscipher_tobe
->name
, 1);
3847 if (!s
->cscipher_tobe
) {
3848 bombout(("Couldn't agree a client-to-server cipher (available: %s)", str
));
3852 ssh2_pkt_getstring(ssh
, &str
, &len
); /* server->client cipher */
3854 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
3855 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
3859 for (j
= 0; j
< c
->nciphers
; j
++) {
3860 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
3861 s
->sccipher_tobe
= c
->list
[j
];
3866 if (s
->sccipher_tobe
) {
3868 askcipher(s
->sccipher_tobe
->name
, 2);
3872 if (!s
->sccipher_tobe
) {
3873 bombout(("Couldn't agree a server-to-client cipher (available: %s)", str
));
3877 ssh2_pkt_getstring(ssh
, &str
, &len
); /* client->server mac */
3878 for (i
= 0; i
< s
->nmacs
; i
++) {
3879 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
3880 s
->csmac_tobe
= s
->maclist
[i
];
3884 ssh2_pkt_getstring(ssh
, &str
, &len
); /* server->client mac */
3885 for (i
= 0; i
< s
->nmacs
; i
++) {
3886 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
3887 s
->scmac_tobe
= s
->maclist
[i
];
3891 ssh2_pkt_getstring(ssh
, &str
, &len
); /* client->server compression */
3892 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
3893 const struct ssh_compress
*c
=
3894 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
3895 if (in_commasep_string(c
->name
, str
, len
)) {
3900 ssh2_pkt_getstring(ssh
, &str
, &len
); /* server->client compression */
3901 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
3902 const struct ssh_compress
*c
=
3903 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
3904 if (in_commasep_string(c
->name
, str
, len
)) {
3912 * Work out the number of bits of key we will need from the key
3913 * exchange. We start with the maximum key length of either
3919 csbits
= s
->cscipher_tobe
->keylen
;
3920 scbits
= s
->sccipher_tobe
->keylen
;
3921 s
->nbits
= (csbits
> scbits ? csbits
: scbits
);
3923 /* The keys only have 160-bit entropy, since they're based on
3924 * a SHA-1 hash. So cap the key size at 160 bits. */
3929 * If we're doing Diffie-Hellman group exchange, start by
3930 * requesting a group.
3932 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
3933 logevent("Doing Diffie-Hellman group exchange");
3934 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGEX
;
3936 * Work out how big a DH group we will need to allow that
3939 s
->pbits
= 512 << ((s
->nbits
- 1) / 64);
3940 ssh2_pkt_init(ssh
, SSH2_MSG_KEX_DH_GEX_REQUEST
);
3941 ssh2_pkt_adduint32(ssh
, s
->pbits
);
3945 if (ssh
->pktin
.type
!= SSH2_MSG_KEX_DH_GEX_GROUP
) {
3946 bombout(("expected key exchange group packet from server"));
3949 s
->p
= ssh2_pkt_getmp(ssh
);
3950 s
->g
= ssh2_pkt_getmp(ssh
);
3951 dh_setup_group(s
->p
, s
->g
);
3952 s
->kex_init_value
= SSH2_MSG_KEX_DH_GEX_INIT
;
3953 s
->kex_reply_value
= SSH2_MSG_KEX_DH_GEX_REPLY
;
3955 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGROUP1
;
3957 s
->kex_init_value
= SSH2_MSG_KEXDH_INIT
;
3958 s
->kex_reply_value
= SSH2_MSG_KEXDH_REPLY
;
3961 logevent("Doing Diffie-Hellman key exchange");
3963 * Now generate and send e for Diffie-Hellman.
3965 s
->e
= dh_create_e(s
->nbits
* 2);
3966 ssh2_pkt_init(ssh
, s
->kex_init_value
);
3967 ssh2_pkt_addmp(ssh
, s
->e
);
3971 if (ssh
->pktin
.type
!= s
->kex_reply_value
) {
3972 bombout(("expected key exchange reply packet from server"));
3975 ssh2_pkt_getstring(ssh
, &s
->hostkeydata
, &s
->hostkeylen
);
3976 s
->f
= ssh2_pkt_getmp(ssh
);
3977 ssh2_pkt_getstring(ssh
, &s
->sigdata
, &s
->siglen
);
3979 s
->K
= dh_find_K(s
->f
);
3981 sha_string(&ssh
->exhash
, s
->hostkeydata
, s
->hostkeylen
);
3982 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
3983 sha_uint32(&ssh
->exhash
, s
->pbits
);
3984 sha_mpint(&ssh
->exhash
, s
->p
);
3985 sha_mpint(&ssh
->exhash
, s
->g
);
3987 sha_mpint(&ssh
->exhash
, s
->e
);
3988 sha_mpint(&ssh
->exhash
, s
->f
);
3989 sha_mpint(&ssh
->exhash
, s
->K
);
3990 SHA_Final(&ssh
->exhash
, s
->exchange_hash
);
3995 debug(("Exchange hash is:\n"));
3996 dmemdump(s
->exchange_hash
, 20);
3999 s
->hkey
= ssh
->hostkey
->newkey(s
->hostkeydata
, s
->hostkeylen
);
4001 !ssh
->hostkey
->verifysig(s
->hkey
, s
->sigdata
, s
->siglen
,
4002 s
->exchange_hash
, 20)) {
4003 bombout(("Server's host key did not match the signature supplied"));
4008 * Authenticate remote host: verify host key. (We've already
4009 * checked the signature of the exchange hash.)
4011 s
->keystr
= ssh
->hostkey
->fmtkey(s
->hkey
);
4012 s
->fingerprint
= ssh
->hostkey
->fingerprint(s
->hkey
);
4013 verify_ssh_host_key(ssh
->savedhost
, ssh
->savedport
, ssh
->hostkey
->keytype
,
4014 s
->keystr
, s
->fingerprint
);
4015 if (s
->first_kex
) { /* don't bother logging this in rekeys */
4016 logevent("Host key fingerprint is:");
4017 logevent(s
->fingerprint
);
4019 sfree(s
->fingerprint
);
4021 ssh
->hostkey
->freekey(s
->hkey
);
4024 * Send SSH2_MSG_NEWKEYS.
4026 ssh2_pkt_init(ssh
, SSH2_MSG_NEWKEYS
);
4030 * Expect SSH2_MSG_NEWKEYS from server.
4033 if (ssh
->pktin
.type
!= SSH2_MSG_NEWKEYS
) {
4034 bombout(("expected new-keys packet from server"));
4039 * Create and initialise session keys.
4041 if (ssh
->cs_cipher_ctx
)
4042 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
4043 ssh
->cscipher
= s
->cscipher_tobe
;
4044 ssh
->cs_cipher_ctx
= ssh
->cscipher
->make_context();
4046 if (ssh
->sc_cipher_ctx
)
4047 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
4048 ssh
->sccipher
= s
->sccipher_tobe
;
4049 ssh
->sc_cipher_ctx
= ssh
->sccipher
->make_context();
4051 if (ssh
->cs_mac_ctx
)
4052 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
4053 ssh
->csmac
= s
->csmac_tobe
;
4054 ssh
->cs_mac_ctx
= ssh
->csmac
->make_context();
4056 if (ssh
->sc_mac_ctx
)
4057 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
4058 ssh
->scmac
= s
->scmac_tobe
;
4059 ssh
->sc_mac_ctx
= ssh
->scmac
->make_context();
4061 ssh
->cscomp
= s
->cscomp_tobe
;
4062 ssh
->sccomp
= s
->sccomp_tobe
;
4063 ssh
->cscomp
->compress_init();
4064 ssh
->sccomp
->decompress_init();
4066 * Set IVs after keys. Here we use the exchange hash from the
4067 * _first_ key exchange.
4070 unsigned char keyspace
[40];
4072 memcpy(ssh
->v2_session_id
, s
->exchange_hash
,
4073 sizeof(s
->exchange_hash
));
4074 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'C',keyspace
);
4075 ssh
->cscipher
->setkey(ssh
->cs_cipher_ctx
, keyspace
);
4076 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'D',keyspace
);
4077 ssh
->sccipher
->setkey(ssh
->sc_cipher_ctx
, keyspace
);
4078 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'A',keyspace
);
4079 ssh
->cscipher
->setiv(ssh
->cs_cipher_ctx
, keyspace
);
4080 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'B',keyspace
);
4081 ssh
->sccipher
->setiv(ssh
->sc_cipher_ctx
, keyspace
);
4082 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'E',keyspace
);
4083 ssh
->csmac
->setkey(ssh
->cs_mac_ctx
, keyspace
);
4084 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'F',keyspace
);
4085 ssh
->scmac
->setkey(ssh
->sc_mac_ctx
, keyspace
);
4089 sprintf(buf
, "Initialised %.200s client->server encryption",
4090 ssh
->cscipher
->text_name
);
4092 sprintf(buf
, "Initialised %.200s server->client encryption",
4093 ssh
->sccipher
->text_name
);
4099 * If this is the first key exchange phase, we must pass the
4100 * SSH2_MSG_NEWKEYS packet to the next layer, not because it
4101 * wants to see it but because it will need time to initialise
4102 * itself before it sees an actual packet. In subsequent key
4103 * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because
4104 * it would only confuse the layer above.
4106 if (!s
->first_kex
) {
4112 * Now we're encrypting. Begin returning 1 to the protocol main
4113 * function so that other things can run on top of the
4114 * transport. If we ever see a KEXINIT, we must go back to the
4117 while (!(ispkt
&& ssh
->pktin
.type
== SSH2_MSG_KEXINIT
)) {
4120 logevent("Server initiated key re-exchange");
4121 goto begin_key_exchange
;
4127 * Add data to an SSH2 channel output buffer.
4129 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
,
4132 bufchain_add(&c
->v
.v2
.outbuffer
, buf
, len
);
4136 * Attempt to send data on an SSH2 channel.
4138 static int ssh2_try_send(struct ssh_channel
*c
)
4142 while (c
->v
.v2
.remwindow
> 0 && bufchain_size(&c
->v
.v2
.outbuffer
) > 0) {
4145 bufchain_prefix(&c
->v
.v2
.outbuffer
, &data
, &len
);
4146 if ((unsigned)len
> c
->v
.v2
.remwindow
)
4147 len
= c
->v
.v2
.remwindow
;
4148 if ((unsigned)len
> c
->v
.v2
.remmaxpkt
)
4149 len
= c
->v
.v2
.remmaxpkt
;
4150 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_DATA
);
4151 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
4152 ssh2_pkt_addstring_start(ssh
);
4153 ssh2_pkt_addstring_data(ssh
, data
, len
);
4155 bufchain_consume(&c
->v
.v2
.outbuffer
, len
);
4156 c
->v
.v2
.remwindow
-= len
;
4160 * After having sent as much data as we can, return the amount
4163 return bufchain_size(&c
->v
.v2
.outbuffer
);
4167 * Potentially enlarge the window on an SSH2 channel.
4169 static void ssh2_set_window(struct ssh_channel
*c
, unsigned newwin
)
4174 * Never send WINDOW_ADJUST for a channel that the remote side
4175 * already thinks it's closed; there's no point, since it won't
4176 * be sending any more data anyway.
4181 if (newwin
> c
->v
.v2
.locwindow
) {
4182 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
4183 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
4184 ssh2_pkt_adduint32(ssh
, newwin
- c
->v
.v2
.locwindow
);
4186 c
->v
.v2
.locwindow
= newwin
;
4191 * Handle the SSH2 userauth and connection layers.
4193 static void do_ssh2_authconn(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
4195 struct do_ssh2_authconn_state
{
4197 AUTH_INVALID
, AUTH_PUBLICKEY_AGENT
, AUTH_PUBLICKEY_FILE
,
4199 AUTH_KEYBOARD_INTERACTIVE
4203 AUTH_TYPE_PUBLICKEY
,
4204 AUTH_TYPE_PUBLICKEY_OFFER_LOUD
,
4205 AUTH_TYPE_PUBLICKEY_OFFER_QUIET
,
4207 AUTH_TYPE_KEYBOARD_INTERACTIVE
,
4208 AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
4210 int gotit
, need_pw
, can_pubkey
, can_passwd
, can_keyb_inter
;
4211 int tried_pubkey_config
, tried_agent
, tried_keyb_inter
;
4212 int kbd_inter_running
;
4214 int num_prompts
, curr_prompt
, echo
;
4219 void *publickey_blob
;
4220 int publickey_bloblen
;
4221 unsigned char request
[5], *response
, *p
;
4225 char *pkblob
, *alg
, *commentp
;
4226 int pklen
, alglen
, commentlen
;
4227 int siglen
, retlen
, len
;
4228 char *q
, *agentreq
, *ret
;
4231 crState(do_ssh2_authconn_state
);
4233 crBegin(ssh
->do_ssh2_authconn_crstate
);
4236 * Request userauth protocol, and await a response to it.
4238 ssh2_pkt_init(ssh
, SSH2_MSG_SERVICE_REQUEST
);
4239 ssh2_pkt_addstring(ssh
, "ssh-userauth");
4241 crWaitUntilV(ispkt
);
4242 if (ssh
->pktin
.type
!= SSH2_MSG_SERVICE_ACCEPT
) {
4243 bombout(("Server refused user authentication protocol"));
4248 * We repeat this whole loop, including the username prompt,
4249 * until we manage a successful authentication. If the user
4250 * types the wrong _password_, they can be sent back to the
4251 * beginning to try another username, if this is configured on.
4252 * (If they specify a username in the config, they are never
4253 * asked, even if they do give a wrong password.)
4255 * I think this best serves the needs of
4257 * - the people who have no configuration, no keys, and just
4258 * want to try repeated (username,password) pairs until they
4259 * type both correctly
4261 * - people who have keys and configuration but occasionally
4262 * need to fall back to passwords
4264 * - people with a key held in Pageant, who might not have
4265 * logged in to a particular machine before; so they want to
4266 * type a username, and then _either_ their key will be
4267 * accepted, _or_ they will type a password. If they mistype
4268 * the username they will want to be able to get back and
4271 s
->username
[0] = '\0';
4272 s
->got_username
= FALSE
;
4277 if (s
->got_username
&& !cfg
.change_username
) {
4279 * We got a username last time round this loop, and
4280 * with change_username turned off we don't try to get
4283 } else if ((flags
& FLAG_INTERACTIVE
) && !*cfg
.username
) {
4284 if (ssh_get_line
&& !ssh_getline_pw_only
) {
4285 if (!ssh_get_line("login as: ",
4286 s
->username
, sizeof(s
->username
), FALSE
)) {
4288 * get_line failed to get a username.
4291 logevent("No username provided. Abandoning session.");
4292 ssh
->state
= SSH_STATE_CLOSED
;
4296 int ret
; /* need not be saved across crReturn */
4297 c_write_str(ssh
, "login as: ");
4299 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
4301 crWaitUntilV(!ispkt
);
4302 ret
= process_userpass_input(ssh
, in
, inlen
);
4307 c_write_str(ssh
, "\r\n");
4308 s
->username
[strcspn(s
->username
, "\n\r")] = '\0';
4311 strncpy(s
->username
, cfg
.username
, sizeof(s
->username
));
4312 s
->username
[sizeof(s
->username
)-1] = '\0';
4313 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
4314 sprintf(stuff
, "Using username \"%s\".\r\n", s
->username
);
4315 c_write_str(ssh
, stuff
);
4318 s
->got_username
= TRUE
;
4321 * Send an authentication request using method "none": (a)
4322 * just in case it succeeds, and (b) so that we know what
4323 * authentication methods we can usefully try next.
4325 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4327 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4328 ssh2_pkt_addstring(ssh
, s
->username
);
4329 ssh2_pkt_addstring(ssh
, "ssh-connection");/* service requested */
4330 ssh2_pkt_addstring(ssh
, "none"); /* method */
4332 s
->type
= AUTH_TYPE_NONE
;
4334 s
->we_are_in
= FALSE
;
4336 s
->tried_pubkey_config
= FALSE
;
4337 s
->tried_agent
= FALSE
;
4338 s
->tried_keyb_inter
= FALSE
;
4339 s
->kbd_inter_running
= FALSE
;
4340 /* Load the pub half of cfg.keyfile so we notice if it's in Pageant */
4343 logeventf("Reading private key file \"%.150s\"", cfg
.keyfile
);
4344 keytype
= key_type(cfg
.keyfile
);
4345 if (keytype
== SSH_KEYTYPE_SSH2
) {
4347 ssh2_userkey_loadpub(cfg
.keyfile
, NULL
,
4348 &s
->publickey_bloblen
);
4351 logeventf("Unable to use this key file (%s)",
4352 key_type_to_str(keytype
));
4353 sprintf(msgbuf
, "Unable to use key file \"%.150s\" (%s)\r\n",
4354 cfg
.keyfile
, key_type_to_str(keytype
));
4355 c_write_str(ssh
, msgbuf
);
4356 s
->publickey_blob
= NULL
;
4359 s
->publickey_blob
= NULL
;
4363 * Wait for the result of the last authentication request.
4366 crWaitUntilV(ispkt
);
4367 while (ssh
->pktin
.type
== SSH2_MSG_USERAUTH_BANNER
) {
4371 * Don't show the banner if we're operating in
4372 * non-verbose non-interactive mode. (It's probably
4373 * a script, which means nobody will read the
4374 * banner _anyway_, and moreover the printing of
4375 * the banner will screw up processing on the
4376 * output of (say) plink.)
4378 if (flags
& (FLAG_VERBOSE
| FLAG_INTERACTIVE
)) {
4379 ssh2_pkt_getstring(ssh
, &banner
, &size
);
4381 c_write_untrusted(ssh
, banner
, size
);
4383 crWaitUntilV(ispkt
);
4385 if (ssh
->pktin
.type
== SSH2_MSG_USERAUTH_SUCCESS
) {
4386 logevent("Access granted");
4387 s
->we_are_in
= TRUE
;
4391 if (s
->kbd_inter_running
&&
4392 ssh
->pktin
.type
== SSH2_MSG_USERAUTH_INFO_REQUEST
) {
4394 * This is either a further set-of-prompts packet
4395 * in keyboard-interactive authentication, or it's
4396 * the same one and we came back here with `gotit'
4397 * set. In the former case, we must reset the
4398 * curr_prompt variable.
4402 } else if (ssh
->pktin
.type
!= SSH2_MSG_USERAUTH_FAILURE
) {
4403 bombout(("Strange packet received during authentication: type %d",
4411 * OK, we're now sitting on a USERAUTH_FAILURE message, so
4412 * we can look at the string in it and know what we can
4413 * helpfully try next.
4415 if (ssh
->pktin
.type
== SSH2_MSG_USERAUTH_FAILURE
) {
4418 ssh2_pkt_getstring(ssh
, &methods
, &methlen
);
4419 s
->kbd_inter_running
= FALSE
;
4420 if (!ssh2_pkt_getbool(ssh
)) {
4422 * We have received an unequivocal Access
4423 * Denied. This can translate to a variety of
4426 * - if we'd just tried "none" authentication,
4427 * it's not worth printing anything at all
4429 * - if we'd just tried a public key _offer_,
4430 * the message should be "Server refused our
4431 * key" (or no message at all if the key
4432 * came from Pageant)
4434 * - if we'd just tried anything else, the
4435 * message really should be "Access denied".
4437 * Additionally, if we'd just tried password
4438 * authentication, we should break out of this
4439 * whole loop so as to go back to the username
4442 if (s
->type
== AUTH_TYPE_NONE
) {
4444 } else if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
||
4445 s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_QUIET
) {
4446 if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
)
4447 c_write_str(ssh
, "Server refused our key\r\n");
4448 logevent("Server refused public key");
4449 } else if (s
->type
==AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
) {
4450 /* server declined keyboard-interactive; ignore */
4452 c_write_str(ssh
, "Access denied\r\n");
4453 logevent("Access denied");
4454 if (s
->type
== AUTH_TYPE_PASSWORD
) {
4455 s
->we_are_in
= FALSE
;
4460 c_write_str(ssh
, "Further authentication required\r\n");
4461 logevent("Further authentication required");
4465 in_commasep_string("publickey", methods
, methlen
);
4467 in_commasep_string("password", methods
, methlen
);
4468 s
->can_keyb_inter
= cfg
.try_ki_auth
&&
4469 in_commasep_string("keyboard-interactive", methods
, methlen
);
4473 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4476 * Most password/passphrase prompts will be
4477 * non-echoing, so we set this to 0 by default.
4478 * Exception is that some keyboard-interactive prompts
4479 * can be echoing, in which case we'll set this to 1.
4483 if (!s
->method
&& s
->can_pubkey
&&
4484 agent_exists() && !s
->tried_agent
) {
4486 * Attempt public-key authentication using Pageant.
4491 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4492 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
4494 s
->tried_agent
= TRUE
;
4496 logevent("Pageant is running. Requesting keys.");
4498 /* Request the keys held by the agent. */
4499 PUT_32BIT(s
->request
, 1);
4500 s
->request
[4] = SSH2_AGENTC_REQUEST_IDENTITIES
;
4501 agent_query(s
->request
, 5, &r
, &s
->responselen
);
4502 s
->response
= (unsigned char *) r
;
4503 if (s
->response
&& s
->responselen
>= 5 &&
4504 s
->response
[4] == SSH2_AGENT_IDENTITIES_ANSWER
) {
4505 s
->p
= s
->response
+ 5;
4506 s
->nkeys
= GET_32BIT(s
->p
);
4510 sprintf(buf
, "Pageant has %d SSH2 keys", s
->nkeys
);
4513 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
4518 sprintf(buf
, "Trying Pageant key #%d", s
->keyi
);
4521 s
->pklen
= GET_32BIT(s
->p
);
4523 if (s
->publickey_blob
&&
4524 s
->pklen
== s
->publickey_bloblen
&&
4525 !memcmp(s
->p
, s
->publickey_blob
,
4526 s
->publickey_bloblen
)) {
4527 logevent("This key matches configured key file");
4528 s
->tried_pubkey_config
= 1;
4532 s
->alglen
= GET_32BIT(s
->pkblob
);
4533 s
->alg
= s
->pkblob
+ 4;
4534 s
->commentlen
= GET_32BIT(s
->p
);
4537 s
->p
+= s
->commentlen
;
4538 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4539 ssh2_pkt_addstring(ssh
, s
->username
);
4540 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4541 ssh2_pkt_addstring(ssh
, "publickey"); /* method */
4542 ssh2_pkt_addbool(ssh
, FALSE
); /* no signature included */
4543 ssh2_pkt_addstring_start(ssh
);
4544 ssh2_pkt_addstring_data(ssh
, s
->alg
, s
->alglen
);
4545 ssh2_pkt_addstring_start(ssh
);
4546 ssh2_pkt_addstring_data(ssh
, s
->pkblob
, s
->pklen
);
4549 crWaitUntilV(ispkt
);
4550 if (ssh
->pktin
.type
!= SSH2_MSG_USERAUTH_PK_OK
) {
4551 logevent("Key refused");
4555 if (flags
& FLAG_VERBOSE
) {
4556 c_write_str(ssh
, "Authenticating with "
4558 c_write(ssh
, s
->commentp
, s
->commentlen
);
4559 c_write_str(ssh
, "\" from agent\r\n");
4563 * Server is willing to accept the key.
4564 * Construct a SIGN_REQUEST.
4566 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4567 ssh2_pkt_addstring(ssh
, s
->username
);
4568 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4569 ssh2_pkt_addstring(ssh
, "publickey"); /* method */
4570 ssh2_pkt_addbool(ssh
, TRUE
);
4571 ssh2_pkt_addstring_start(ssh
);
4572 ssh2_pkt_addstring_data(ssh
, s
->alg
, s
->alglen
);
4573 ssh2_pkt_addstring_start(ssh
);
4574 ssh2_pkt_addstring_data(ssh
, s
->pkblob
, s
->pklen
);
4576 s
->siglen
= ssh
->pktout
.length
- 5 + 4 + 20;
4577 s
->len
= 1; /* message type */
4578 s
->len
+= 4 + s
->pklen
; /* key blob */
4579 s
->len
+= 4 + s
->siglen
; /* data to sign */
4580 s
->len
+= 4; /* flags */
4581 s
->agentreq
= smalloc(4 + s
->len
);
4582 PUT_32BIT(s
->agentreq
, s
->len
);
4583 s
->q
= s
->agentreq
+ 4;
4584 *s
->q
++ = SSH2_AGENTC_SIGN_REQUEST
;
4585 PUT_32BIT(s
->q
, s
->pklen
);
4587 memcpy(s
->q
, s
->pkblob
, s
->pklen
);
4589 PUT_32BIT(s
->q
, s
->siglen
);
4591 /* Now the data to be signed... */
4592 PUT_32BIT(s
->q
, 20);
4594 memcpy(s
->q
, ssh
->v2_session_id
, 20);
4596 memcpy(s
->q
, ssh
->pktout
.data
+ 5,
4597 ssh
->pktout
.length
- 5);
4598 s
->q
+= ssh
->pktout
.length
- 5;
4599 /* And finally the (zero) flags word. */
4601 agent_query(s
->agentreq
, s
->len
+ 4, &vret
, &s
->retlen
);
4605 if (s
->ret
[4] == SSH2_AGENT_SIGN_RESPONSE
) {
4606 logevent("Sending Pageant's response");
4607 ssh2_add_sigblob(ssh
, s
->pkblob
, s
->pklen
,
4609 GET_32BIT(s
->ret
+ 5));
4615 ("Pageant failed to answer challenge");
4625 if (!s
->method
&& s
->can_pubkey
&& s
->publickey_blob
4626 && !s
->tried_pubkey_config
) {
4627 unsigned char *pub_blob
;
4628 char *algorithm
, *comment
;
4631 s
->tried_pubkey_config
= TRUE
;
4633 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4634 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
4637 * Try the public key supplied in the configuration.
4639 * First, offer the public blob to see if the server is
4640 * willing to accept it.
4642 pub_blob
= ssh2_userkey_loadpub(cfg
.keyfile
, &algorithm
,
4645 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4646 ssh2_pkt_addstring(ssh
, s
->username
);
4647 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4648 ssh2_pkt_addstring(ssh
, "publickey"); /* method */
4649 ssh2_pkt_addbool(ssh
, FALSE
); /* no signature included */
4650 ssh2_pkt_addstring(ssh
, algorithm
);
4651 ssh2_pkt_addstring_start(ssh
);
4652 ssh2_pkt_addstring_data(ssh
, pub_blob
, pub_blob_len
);
4654 logevent("Offered public key"); /* FIXME */
4656 crWaitUntilV(ispkt
);
4657 if (ssh
->pktin
.type
!= SSH2_MSG_USERAUTH_PK_OK
) {
4659 s
->type
= AUTH_TYPE_PUBLICKEY_OFFER_LOUD
;
4660 continue; /* key refused; give up on it */
4663 logevent("Offer of public key accepted");
4665 * Actually attempt a serious authentication using
4668 if (ssh2_userkey_encrypted(cfg
.keyfile
, &comment
)) {
4669 sprintf(s
->pwprompt
,
4670 "Passphrase for key \"%.100s\": ",
4676 c_write_str(ssh
, "Authenticating with public key \"");
4677 c_write_str(ssh
, comment
);
4678 c_write_str(ssh
, "\"\r\n");
4679 s
->method
= AUTH_PUBLICKEY_FILE
;
4683 if (!s
->method
&& s
->can_keyb_inter
&& !s
->tried_keyb_inter
) {
4684 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
4685 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
4686 s
->tried_keyb_inter
= TRUE
;
4688 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4689 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
4691 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4692 ssh2_pkt_addstring(ssh
, s
->username
);
4693 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4694 ssh2_pkt_addstring(ssh
, "keyboard-interactive"); /* method */
4695 ssh2_pkt_addstring(ssh
, ""); /* lang */
4696 ssh2_pkt_addstring(ssh
, "");
4699 crWaitUntilV(ispkt
);
4700 if (ssh
->pktin
.type
!= SSH2_MSG_USERAUTH_INFO_REQUEST
) {
4701 if (ssh
->pktin
.type
== SSH2_MSG_USERAUTH_FAILURE
)
4703 logevent("Keyboard-interactive authentication refused");
4704 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
;
4708 s
->kbd_inter_running
= TRUE
;
4712 if (s
->kbd_inter_running
) {
4713 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
4714 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
4715 s
->tried_keyb_inter
= TRUE
;
4717 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4718 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
4720 if (s
->curr_prompt
== 0) {
4722 * We've got a fresh USERAUTH_INFO_REQUEST.
4723 * Display header data, and start going through
4726 char *name
, *inst
, *lang
;
4727 int name_len
, inst_len
, lang_len
;
4729 ssh2_pkt_getstring(ssh
, &name
, &name_len
);
4730 ssh2_pkt_getstring(ssh
, &inst
, &inst_len
);
4731 ssh2_pkt_getstring(ssh
, &lang
, &lang_len
);
4733 c_write_untrusted(ssh
, name
, name_len
);
4734 c_write_str(ssh
, "\r\n");
4737 c_write_untrusted(ssh
, inst
, inst_len
);
4738 c_write_str(ssh
, "\r\n");
4740 s
->num_prompts
= ssh2_pkt_getuint32(ssh
);
4744 * If there are prompts remaining in the packet,
4745 * display one and get a response.
4747 if (s
->curr_prompt
< s
->num_prompts
) {
4751 ssh2_pkt_getstring(ssh
, &prompt
, &prompt_len
);
4752 if (prompt_len
> 0) {
4753 strncpy(s
->pwprompt
, prompt
, sizeof(s
->pwprompt
));
4754 s
->pwprompt
[prompt_len
< sizeof(s
->pwprompt
) ?
4755 prompt_len
: sizeof(s
->pwprompt
)-1] = '\0';
4758 "<server failed to send prompt>: ");
4760 s
->echo
= ssh2_pkt_getbool(ssh
);
4766 if (!s
->method
&& s
->can_passwd
) {
4767 s
->method
= AUTH_PASSWORD
;
4768 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4769 ssh
->pkt_ctx
|= SSH2_PKTCTX_PASSWORD
;
4770 sprintf(s
->pwprompt
, "%.90s@%.90s's password: ", s
->username
,
4777 if (!ssh_get_line(s
->pwprompt
, s
->password
,
4778 sizeof(s
->password
), TRUE
)) {
4780 * get_line failed to get a password (for
4781 * example because one was supplied on the
4782 * command line which has already failed to
4785 ssh2_pkt_init(ssh
, SSH2_MSG_DISCONNECT
);
4786 ssh2_pkt_adduint32(ssh
,SSH2_DISCONNECT_BY_APPLICATION
);
4787 ssh2_pkt_addstring(ssh
, "No more passwords available"
4789 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
4791 logevent("Unable to authenticate");
4792 connection_fatal("Unable to authenticate");
4793 ssh
->state
= SSH_STATE_CLOSED
;
4797 int ret
; /* need not be saved across crReturn */
4798 c_write_untrusted(ssh
, s
->pwprompt
, strlen(s
->pwprompt
));
4801 setup_userpass_input(ssh
, s
->password
,
4802 sizeof(s
->password
), s
->echo
);
4804 crWaitUntilV(!ispkt
);
4805 ret
= process_userpass_input(ssh
, in
, inlen
);
4809 c_write_str(ssh
, "\r\n");
4813 if (s
->method
== AUTH_PUBLICKEY_FILE
) {
4815 * We have our passphrase. Now try the actual authentication.
4817 struct ssh2_userkey
*key
;
4819 key
= ssh2_load_userkey(cfg
.keyfile
, s
->password
);
4820 if (key
== SSH2_WRONG_PASSPHRASE
|| key
== NULL
) {
4821 if (key
== SSH2_WRONG_PASSPHRASE
) {
4822 c_write_str(ssh
, "Wrong passphrase\r\n");
4823 s
->tried_pubkey_config
= FALSE
;
4825 c_write_str(ssh
, "Unable to load private key\r\n");
4826 s
->tried_pubkey_config
= TRUE
;
4828 /* Send a spurious AUTH_NONE to return to the top. */
4829 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4830 ssh2_pkt_addstring(ssh
, s
->username
);
4831 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4832 ssh2_pkt_addstring(ssh
, "none"); /* method */
4834 s
->type
= AUTH_TYPE_NONE
;
4836 unsigned char *pkblob
, *sigblob
, *sigdata
;
4837 int pkblob_len
, sigblob_len
, sigdata_len
;
4840 * We have loaded the private key and the server
4841 * has announced that it's willing to accept it.
4842 * Hallelujah. Generate a signature and send it.
4844 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4845 ssh2_pkt_addstring(ssh
, s
->username
);
4846 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4847 ssh2_pkt_addstring(ssh
, "publickey"); /* method */
4848 ssh2_pkt_addbool(ssh
, TRUE
);
4849 ssh2_pkt_addstring(ssh
, key
->alg
->name
);
4850 pkblob
= key
->alg
->public_blob(key
->data
, &pkblob_len
);
4851 ssh2_pkt_addstring_start(ssh
);
4852 ssh2_pkt_addstring_data(ssh
, pkblob
, pkblob_len
);
4855 * The data to be signed is:
4859 * followed by everything so far placed in the
4862 sigdata_len
= ssh
->pktout
.length
- 5 + 4 + 20;
4863 sigdata
= smalloc(sigdata_len
);
4864 PUT_32BIT(sigdata
, 20);
4865 memcpy(sigdata
+ 4, ssh
->v2_session_id
, 20);
4866 memcpy(sigdata
+ 24, ssh
->pktout
.data
+ 5,
4867 ssh
->pktout
.length
- 5);
4868 sigblob
= key
->alg
->sign(key
->data
, sigdata
,
4869 sigdata_len
, &sigblob_len
);
4870 ssh2_add_sigblob(ssh
, pkblob
, pkblob_len
,
4871 sigblob
, sigblob_len
);
4877 s
->type
= AUTH_TYPE_PUBLICKEY
;
4879 } else if (s
->method
== AUTH_PASSWORD
) {
4881 * We send the password packet lumped tightly together with
4882 * an SSH_MSG_IGNORE packet. The IGNORE packet contains a
4883 * string long enough to make the total length of the two
4884 * packets constant. This should ensure that a passive
4885 * listener doing traffic analyis can't work out the length
4888 * For this to work, we need an assumption about the
4889 * maximum length of the password packet. I think 256 is
4890 * pretty conservative. Anyone using a password longer than
4891 * that probably doesn't have much to worry about from
4892 * people who find out how long their password is!
4894 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4895 ssh2_pkt_addstring(ssh
, s
->username
);
4896 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4897 ssh2_pkt_addstring(ssh
, "password");
4898 ssh2_pkt_addbool(ssh
, FALSE
);
4899 ssh2_pkt_addstring(ssh
, s
->password
);
4900 ssh2_pkt_defer(ssh
);
4902 * We'll include a string that's an exact multiple of the
4903 * cipher block size. If the cipher is NULL for some
4904 * reason, we don't do this trick at all because we gain
4907 if (ssh
->cscipher
) {
4910 stringlen
= (256 - ssh
->deferred_len
);
4911 stringlen
+= ssh
->cscipher
->blksize
- 1;
4912 stringlen
-= (stringlen
% ssh
->cscipher
->blksize
);
4915 * Temporarily disable actual compression,
4916 * so we can guarantee to get this string
4917 * exactly the length we want it. The
4918 * compression-disabling routine should
4919 * return an integer indicating how many
4920 * bytes we should adjust our string length
4923 stringlen
-= ssh
->cscomp
->disable_compression();
4925 ssh2_pkt_init(ssh
, SSH2_MSG_IGNORE
);
4926 ssh2_pkt_addstring_start(ssh
);
4927 for (i
= 0; i
< stringlen
; i
++) {
4928 char c
= (char) random_byte();
4929 ssh2_pkt_addstring_data(ssh
, &c
, 1);
4931 ssh2_pkt_defer(ssh
);
4933 ssh_pkt_defersend(ssh
);
4934 logevent("Sent password");
4935 s
->type
= AUTH_TYPE_PASSWORD
;
4936 } else if (s
->method
== AUTH_KEYBOARD_INTERACTIVE
) {
4937 if (s
->curr_prompt
== 0) {
4938 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_INFO_RESPONSE
);
4939 ssh2_pkt_adduint32(ssh
, s
->num_prompts
);
4941 if (s
->need_pw
) { /* only add pw if we just got one! */
4942 ssh2_pkt_addstring(ssh
, s
->password
);
4943 memset(s
->password
, 0, sizeof(s
->password
));
4946 if (s
->curr_prompt
>= s
->num_prompts
) {
4950 * If there are prompts remaining, we set
4951 * `gotit' so that we won't attempt to get
4952 * another packet. Then we go back round the
4953 * loop and will end up retrieving another
4954 * prompt out of the existing packet. Funky or
4959 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
4961 c_write_str(ssh
, "No supported authentication methods"
4962 " left to try!\r\n");
4963 logevent("No supported authentications offered."
4965 ssh2_pkt_init(ssh
, SSH2_MSG_DISCONNECT
);
4966 ssh2_pkt_adduint32(ssh
, SSH2_DISCONNECT_BY_APPLICATION
);
4967 ssh2_pkt_addstring(ssh
, "No supported authentication"
4968 " methods available");
4969 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
4971 ssh
->state
= SSH_STATE_CLOSED
;
4975 } while (!s
->we_are_in
);
4978 * Now we're authenticated for the connection protocol. The
4979 * connection protocol will automatically have started at this
4980 * point; there's no need to send SERVICE_REQUEST.
4984 * So now create a channel with a session in it.
4986 ssh
->channels
= newtree234(ssh_channelcmp
);
4987 ssh
->mainchan
= smalloc(sizeof(struct ssh_channel
));
4988 ssh
->mainchan
->ssh
= ssh
;
4989 ssh
->mainchan
->localid
= alloc_channel_id(ssh
);
4990 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_OPEN
);
4991 ssh2_pkt_addstring(ssh
, "session");
4992 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->localid
);
4993 ssh
->mainchan
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
4994 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->v
.v2
.locwindow
);/* our window size */
4995 ssh2_pkt_adduint32(ssh
, 0x4000UL
); /* our max pkt size */
4997 crWaitUntilV(ispkt
);
4998 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
4999 bombout(("Server refused to open a session"));
5001 /* FIXME: error data comes back in FAILURE packet */
5003 if (ssh2_pkt_getuint32(ssh
) != ssh
->mainchan
->localid
) {
5004 bombout(("Server's channel confirmation cited wrong channel"));
5007 ssh
->mainchan
->remoteid
= ssh2_pkt_getuint32(ssh
);
5008 ssh
->mainchan
->type
= CHAN_MAINSESSION
;
5009 ssh
->mainchan
->closes
= 0;
5010 ssh
->mainchan
->v
.v2
.remwindow
= ssh2_pkt_getuint32(ssh
);
5011 ssh
->mainchan
->v
.v2
.remmaxpkt
= ssh2_pkt_getuint32(ssh
);
5012 bufchain_init(&ssh
->mainchan
->v
.v2
.outbuffer
);
5013 add234(ssh
->channels
, ssh
->mainchan
);
5014 logevent("Opened channel for session");
5017 * Potentially enable X11 forwarding.
5019 if (cfg
.x11_forward
) {
5020 char proto
[20], data
[64];
5021 logevent("Requesting X11 forwarding");
5022 x11_invent_auth(proto
, sizeof(proto
), data
, sizeof(data
));
5023 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5024 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
5025 ssh2_pkt_addstring(ssh
, "x11-req");
5026 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5027 ssh2_pkt_addbool(ssh
, 0); /* many connections */
5028 ssh2_pkt_addstring(ssh
, proto
);
5029 ssh2_pkt_addstring(ssh
, data
);
5030 ssh2_pkt_adduint32(ssh
, 0); /* screen number */
5034 crWaitUntilV(ispkt
);
5035 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5036 unsigned i
= ssh2_pkt_getuint32(ssh
);
5037 struct ssh_channel
*c
;
5038 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5040 continue; /* nonexistent channel */
5041 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5043 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5045 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
5046 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
5047 bombout(("Unexpected response to X11 forwarding request:"
5048 " packet type %d", ssh
->pktin
.type
));
5051 logevent("X11 forwarding refused");
5053 logevent("X11 forwarding enabled");
5054 ssh
->X11_fwd_enabled
= TRUE
;
5059 * Enable port forwardings.
5064 int sport
,dport
,sserv
,dserv
;
5065 char sports
[256], dports
[256], host
[256];
5069 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh2
);
5070 /* Add port forwardings. */
5071 ssh
->portfwd_strptr
= cfg
.portfwd
;
5072 while (*ssh
->portfwd_strptr
) {
5073 type
= *ssh
->portfwd_strptr
++;
5075 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= '\t')
5076 sports
[n
++] = *ssh
->portfwd_strptr
++;
5078 if (*ssh
->portfwd_strptr
== '\t')
5079 ssh
->portfwd_strptr
++;
5081 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= ':')
5082 host
[n
++] = *ssh
->portfwd_strptr
++;
5084 if (*ssh
->portfwd_strptr
== ':')
5085 ssh
->portfwd_strptr
++;
5087 while (*ssh
->portfwd_strptr
)
5088 dports
[n
++] = *ssh
->portfwd_strptr
++;
5090 ssh
->portfwd_strptr
++;
5091 dport
= atoi(dports
);
5095 se
= getservbyname(dports
, NULL
);
5097 dport
= ntohs(se
->s_port
);
5100 "Service lookup failed for destination port \"%s\"",
5105 sport
= atoi(sports
);
5109 se
= getservbyname(sports
, NULL
);
5111 sport
= ntohs(se
->s_port
);
5114 "Service lookup failed for source port \"%s\"",
5119 if (sport
&& dport
) {
5121 pfd_addforward(host
, dport
, sport
);
5122 sprintf(buf
, "Local port %.*s%.*s%d%.*s forwarding to"
5123 " %s:%.*s%.*s%d%.*s",
5124 sserv ?
strlen(sports
) : 0, sports
,
5125 sserv
, "(", sport
, sserv
, ")",
5127 dserv ?
strlen(dports
) : 0, dports
,
5128 dserv
, "(", dport
, dserv
, ")");
5131 struct ssh_rportfwd
*pf
;
5132 pf
= smalloc(sizeof(*pf
));
5133 strcpy(pf
->dhost
, host
);
5136 if (add234(ssh
->rportfwds
, pf
) != pf
) {
5138 "Duplicate remote port forwarding to %s:%d",
5143 sprintf(buf
, "Requesting remote port %.*s%.*s%d%.*s"
5144 " forward to %s:%.*s%.*s%d%.*s",
5145 sserv ?
strlen(sports
) : 0, sports
,
5146 sserv
, "(", sport
, sserv
, ")",
5148 dserv ?
strlen(dports
) : 0, dports
,
5149 dserv
, "(", dport
, dserv
, ")");
5151 ssh2_pkt_init(ssh
, SSH2_MSG_GLOBAL_REQUEST
);
5152 ssh2_pkt_addstring(ssh
, "tcpip-forward");
5153 ssh2_pkt_addbool(ssh
, 1);/* want reply */
5154 if (cfg
.rport_acceptall
)
5155 ssh2_pkt_addstring(ssh
, "0.0.0.0");
5157 ssh2_pkt_addstring(ssh
, "127.0.0.1");
5158 ssh2_pkt_adduint32(ssh
, sport
);
5162 crWaitUntilV(ispkt
);
5163 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5164 unsigned i
= ssh2_pkt_getuint32(ssh
);
5165 struct ssh_channel
*c
;
5166 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5168 continue;/* nonexistent channel */
5169 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5171 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5173 if (ssh
->pktin
.type
!= SSH2_MSG_REQUEST_SUCCESS
) {
5174 if (ssh
->pktin
.type
!= SSH2_MSG_REQUEST_FAILURE
) {
5175 bombout(("Unexpected response to port "
5176 "forwarding request: packet type %d",
5180 logevent("Server refused this port forwarding");
5182 logevent("Remote port forwarding enabled");
5191 * Potentially enable agent forwarding.
5193 if (cfg
.agentfwd
&& agent_exists()) {
5194 logevent("Requesting OpenSSH-style agent forwarding");
5195 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5196 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
5197 ssh2_pkt_addstring(ssh
, "auth-agent-req@openssh.com");
5198 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5202 crWaitUntilV(ispkt
);
5203 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5204 unsigned i
= ssh2_pkt_getuint32(ssh
);
5205 struct ssh_channel
*c
;
5206 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5208 continue; /* nonexistent channel */
5209 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5211 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5213 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
5214 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
5215 bombout(("Unexpected response to agent forwarding request:"
5216 " packet type %d", ssh
->pktin
.type
));
5219 logevent("Agent forwarding refused");
5221 logevent("Agent forwarding enabled");
5222 ssh
->agentfwd_enabled
= TRUE
;
5227 * Now allocate a pty for the session.
5230 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5231 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
); /* recipient channel */
5232 ssh2_pkt_addstring(ssh
, "pty-req");
5233 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5234 ssh2_pkt_addstring(ssh
, cfg
.termtype
);
5235 ssh2_pkt_adduint32(ssh
, ssh
->term_width
);
5236 ssh2_pkt_adduint32(ssh
, ssh
->term_height
);
5237 ssh2_pkt_adduint32(ssh
, 0); /* pixel width */
5238 ssh2_pkt_adduint32(ssh
, 0); /* pixel height */
5239 ssh2_pkt_addstring_start(ssh
);
5240 ssh2_pkt_addstring_data(ssh
, "\0", 1); /* TTY_OP_END, no special options */
5242 ssh
->state
= SSH_STATE_INTERMED
;
5245 crWaitUntilV(ispkt
);
5246 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5247 unsigned i
= ssh2_pkt_getuint32(ssh
);
5248 struct ssh_channel
*c
;
5249 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5251 continue; /* nonexistent channel */
5252 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5254 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5256 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
5257 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
5258 bombout(("Unexpected response to pty request:"
5259 " packet type %d", ssh
->pktin
.type
));
5262 c_write_str(ssh
, "Server refused to allocate pty\r\n");
5263 ssh
->editing
= ssh
->echoing
= 1;
5265 logevent("Allocated pty");
5268 ssh
->editing
= ssh
->echoing
= 1;
5272 * Start a shell or a remote command. We may have to attempt
5273 * this twice if the config data has provided a second choice
5280 if (ssh
->fallback_cmd
) {
5281 subsys
= cfg
.ssh_subsys2
;
5282 cmd
= cfg
.remote_cmd_ptr2
;
5284 subsys
= cfg
.ssh_subsys
;
5285 cmd
= cfg
.remote_cmd_ptr
;
5288 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5289 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
); /* recipient channel */
5291 ssh2_pkt_addstring(ssh
, "subsystem");
5292 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5293 ssh2_pkt_addstring(ssh
, cmd
);
5295 ssh2_pkt_addstring(ssh
, "exec");
5296 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5297 ssh2_pkt_addstring(ssh
, cmd
);
5299 ssh2_pkt_addstring(ssh
, "shell");
5300 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5304 crWaitUntilV(ispkt
);
5305 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5306 unsigned i
= ssh2_pkt_getuint32(ssh
);
5307 struct ssh_channel
*c
;
5308 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5310 continue; /* nonexistent channel */
5311 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5313 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5314 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
5315 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
5316 bombout(("Unexpected response to shell/command request:"
5317 " packet type %d", ssh
->pktin
.type
));
5321 * We failed to start the command. If this is the
5322 * fallback command, we really are finished; if it's
5323 * not, and if the fallback command exists, try falling
5324 * back to it before complaining.
5326 if (!ssh
->fallback_cmd
&& cfg
.remote_cmd_ptr2
!= NULL
) {
5327 logevent("Primary command failed; attempting fallback");
5328 ssh
->fallback_cmd
= TRUE
;
5331 bombout(("Server refused to start a shell/command"));
5334 logevent("Started a shell/command");
5339 ssh
->state
= SSH_STATE_SESSION
;
5340 if (ssh
->size_needed
)
5341 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
5342 if (ssh
->eof_needed
)
5343 ssh_special(ssh
, TS_EOF
);
5348 ldisc_send(NULL
, 0, 0); /* cause ldisc to notice changes */
5352 s
->try_send
= FALSE
;
5354 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_DATA
||
5355 ssh
->pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
) {
5358 unsigned i
= ssh2_pkt_getuint32(ssh
);
5359 struct ssh_channel
*c
;
5360 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5362 continue; /* nonexistent channel */
5363 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
&&
5364 ssh2_pkt_getuint32(ssh
) != SSH2_EXTENDED_DATA_STDERR
)
5365 continue; /* extended but not stderr */
5366 ssh2_pkt_getstring(ssh
, &data
, &length
);
5369 c
->v
.v2
.locwindow
-= length
;
5371 case CHAN_MAINSESSION
:
5373 from_backend(ssh
->frontend
, ssh
->pktin
.type
==
5374 SSH2_MSG_CHANNEL_EXTENDED_DATA
,
5378 bufsize
= x11_send(c
->u
.x11
.s
, data
, length
);
5381 bufsize
= pfd_send(c
->u
.pfd
.s
, data
, length
);
5384 while (length
> 0) {
5385 if (c
->u
.a
.lensofar
< 4) {
5386 int l
= min(4 - c
->u
.a
.lensofar
, length
);
5387 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
,
5391 c
->u
.a
.lensofar
+= l
;
5393 if (c
->u
.a
.lensofar
== 4) {
5395 4 + GET_32BIT(c
->u
.a
.msglen
);
5396 c
->u
.a
.message
= smalloc(c
->u
.a
.totallen
);
5397 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
5399 if (c
->u
.a
.lensofar
>= 4 && length
> 0) {
5401 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
5403 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
,
5407 c
->u
.a
.lensofar
+= l
;
5409 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
5410 void *reply
, *sentreply
;
5412 agent_query(c
->u
.a
.message
,
5413 c
->u
.a
.totallen
, &reply
,
5418 /* Fake SSH_AGENT_FAILURE. */
5419 sentreply
= "\0\0\0\1\5";
5422 ssh2_add_channel_data(c
, sentreply
, replylen
);
5426 sfree(c
->u
.a
.message
);
5427 c
->u
.a
.lensofar
= 0;
5434 * If we are not buffering too much data,
5435 * enlarge the window again at the remote side.
5437 if (bufsize
< OUR_V2_WINSIZE
)
5438 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
5440 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_EOF
) {
5441 unsigned i
= ssh2_pkt_getuint32(ssh
);
5442 struct ssh_channel
*c
;
5444 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5446 continue; /* nonexistent channel */
5448 if (c
->type
== CHAN_X11
) {
5450 * Remote EOF on an X11 channel means we should
5451 * wrap up and close the channel ourselves.
5453 x11_close(c
->u
.x11
.s
);
5455 } else if (c
->type
== CHAN_AGENT
) {
5457 } else if (c
->type
== CHAN_SOCKDATA
) {
5458 pfd_close(c
->u
.pfd
.s
);
5461 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_CLOSE
) {
5462 unsigned i
= ssh2_pkt_getuint32(ssh
);
5463 struct ssh_channel
*c
;
5465 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5466 if (!c
|| ((int)c
->remoteid
) == -1) {
5467 bombout(("Received CHANNEL_CLOSE for %s channel %d\n",
5468 c ?
"half-open" : "nonexistent", i
));
5470 /* Do pre-close processing on the channel. */
5472 case CHAN_MAINSESSION
:
5473 break; /* nothing to see here, move along */
5475 if (c
->u
.x11
.s
!= NULL
)
5476 x11_close(c
->u
.x11
.s
);
5483 if (c
->u
.pfd
.s
!= NULL
)
5484 pfd_close(c
->u
.pfd
.s
);
5488 if (c
->closes
== 0) {
5489 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_CLOSE
);
5490 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
5493 del234(ssh
->channels
, c
);
5494 bufchain_clear(&c
->v
.v2
.outbuffer
);
5498 * See if that was the last channel left open.
5500 if (count234(ssh
->channels
) == 0) {
5503 * We used to send SSH_MSG_DISCONNECT here,
5504 * because I'd believed that _every_ conforming
5505 * SSH2 connection had to end with a disconnect
5506 * being sent by at least one side; apparently
5507 * I was wrong and it's perfectly OK to
5508 * unceremoniously slam the connection shut
5509 * when you're done, and indeed OpenSSH feels
5510 * this is more polite than sending a
5511 * DISCONNECT. So now we don't.
5513 logevent("All channels closed. Disconnecting");
5514 ssh2_pkt_init(ssh
, SSH2_MSG_DISCONNECT
);
5515 ssh2_pkt_adduint32(ssh
, SSH2_DISCONNECT_BY_APPLICATION
);
5516 ssh2_pkt_addstring(ssh
, "All open channels closed");
5517 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
5520 ssh
->state
= SSH_STATE_CLOSED
;
5523 continue; /* remote sends close; ignore (FIXME) */
5524 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5525 unsigned i
= ssh2_pkt_getuint32(ssh
);
5526 struct ssh_channel
*c
;
5527 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5529 continue; /* nonexistent channel */
5530 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5532 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
5533 unsigned i
= ssh2_pkt_getuint32(ssh
);
5534 struct ssh_channel
*c
;
5535 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5537 continue; /* nonexistent channel */
5538 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
5539 continue; /* dunno why they're confirming this */
5540 c
->remoteid
= ssh2_pkt_getuint32(ssh
);
5541 c
->type
= CHAN_SOCKDATA
;
5542 c
->v
.v2
.remwindow
= ssh2_pkt_getuint32(ssh
);
5543 c
->v
.v2
.remmaxpkt
= ssh2_pkt_getuint32(ssh
);
5545 pfd_confirm(c
->u
.pfd
.s
);
5548 * We have a pending close on this channel,
5549 * which we decided on before the server acked
5550 * the channel open. So now we know the
5551 * remoteid, we can close it again.
5553 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_CLOSE
);
5554 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
5557 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_OPEN_FAILURE
) {
5558 unsigned i
= ssh2_pkt_getuint32(ssh
);
5559 struct ssh_channel
*c
;
5560 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5562 continue; /* nonexistent channel */
5563 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
5564 continue; /* dunno why they're failing this */
5566 logevent("Forwarded connection refused by server");
5568 pfd_close(c
->u
.pfd
.s
);
5570 del234(ssh
->channels
, c
);
5572 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_REQUEST
) {
5575 int typelen
, want_reply
;
5576 struct ssh_channel
*c
;
5578 localid
= ssh2_pkt_getuint32(ssh
);
5579 ssh2_pkt_getstring(ssh
, &type
, &typelen
);
5580 want_reply
= ssh2_pkt_getbool(ssh
);
5583 * First, check that the channel exists. Otherwise,
5584 * we can instantly disconnect with a rude message.
5586 c
= find234(ssh
->channels
, &localid
, ssh_channelfind
);
5589 sprintf(buf
, "Received channel request for nonexistent"
5590 " channel %d", localid
);
5592 ssh2_pkt_init(ssh
, SSH2_MSG_DISCONNECT
);
5593 ssh2_pkt_adduint32(ssh
, SSH2_DISCONNECT_BY_APPLICATION
);
5594 ssh2_pkt_addstring(ssh
, buf
);
5595 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
5597 connection_fatal("%s", buf
);
5598 ssh
->state
= SSH_STATE_CLOSED
;
5603 * Having got the channel number, we now look at
5604 * the request type string to see if it's something
5607 if (typelen
== 11 && !memcmp(type
, "exit-status", 11) &&
5608 c
== ssh
->mainchan
) {
5609 /* We recognise "exit-status" on the primary channel. */
5611 ssh
->exitcode
= ssh2_pkt_getuint32(ssh
);
5612 sprintf(buf
, "Server sent command exit status %d",
5616 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_SUCCESS
);
5617 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
5622 * This is a channel request we don't know
5623 * about, so we now either ignore the request
5624 * or respond with CHANNEL_FAILURE, depending
5628 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_FAILURE
);
5629 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
5633 } else if (ssh
->pktin
.type
== SSH2_MSG_GLOBAL_REQUEST
) {
5635 int typelen
, want_reply
;
5637 ssh2_pkt_getstring(ssh
, &type
, &typelen
);
5638 want_reply
= ssh2_pkt_getbool(ssh
);
5641 * We currently don't support any global requests
5642 * at all, so we either ignore the request or
5643 * respond with REQUEST_FAILURE, depending on
5647 ssh2_pkt_init(ssh
, SSH2_MSG_REQUEST_FAILURE
);
5650 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_OPEN
) {
5654 struct ssh_channel
*c
;
5655 unsigned remid
, winsize
, pktsize
;
5656 ssh2_pkt_getstring(ssh
, &type
, &typelen
);
5657 c
= smalloc(sizeof(struct ssh_channel
));
5660 remid
= ssh2_pkt_getuint32(ssh
);
5661 winsize
= ssh2_pkt_getuint32(ssh
);
5662 pktsize
= ssh2_pkt_getuint32(ssh
);
5664 if (typelen
== 3 && !memcmp(type
, "x11", 3)) {
5665 if (!ssh
->X11_fwd_enabled
)
5666 error
= "X11 forwarding is not enabled";
5667 else if (x11_init(&c
->u
.x11
.s
, cfg
.x11_display
, c
) !=
5669 error
= "Unable to open an X11 connection";
5673 } else if (typelen
== 15 &&
5674 !memcmp(type
, "forwarded-tcpip", 15)) {
5675 struct ssh_rportfwd pf
, *realpf
;
5678 ssh2_pkt_getstring(ssh
, &dummy
, &dummylen
);/* skip address */
5679 pf
.sport
= ssh2_pkt_getuint32(ssh
);
5680 realpf
= find234(ssh
->rportfwds
, &pf
, NULL
);
5681 if (realpf
== NULL
) {
5682 error
= "Remote port is not recognised";
5684 char *e
= pfd_newconnect(&c
->u
.pfd
.s
, realpf
->dhost
,
5687 sprintf(buf
, "Received remote port open request for %s:%d",
5688 realpf
->dhost
, realpf
->dport
);
5691 sprintf(buf
, "Port open failed: %s", e
);
5693 error
= "Port open failed";
5695 logevent("Forwarded port opened successfully");
5696 c
->type
= CHAN_SOCKDATA
;
5699 } else if (typelen
== 22 &&
5700 !memcmp(type
, "auth-agent@openssh.com", 3)) {
5701 if (!ssh
->agentfwd_enabled
)
5702 error
= "Agent forwarding is not enabled";
5704 c
->type
= CHAN_AGENT
; /* identify channel type */
5705 c
->u
.a
.lensofar
= 0;
5708 error
= "Unsupported channel type requested";
5711 c
->remoteid
= remid
;
5713 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_OPEN_FAILURE
);
5714 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
5715 ssh2_pkt_adduint32(ssh
, SSH2_OPEN_CONNECT_FAILED
);
5716 ssh2_pkt_addstring(ssh
, error
);
5717 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
5721 c
->localid
= alloc_channel_id(ssh
);
5723 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
5724 c
->v
.v2
.remwindow
= winsize
;
5725 c
->v
.v2
.remmaxpkt
= pktsize
;
5726 bufchain_init(&c
->v
.v2
.outbuffer
);
5727 add234(ssh
->channels
, c
);
5728 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
);
5729 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
5730 ssh2_pkt_adduint32(ssh
, c
->localid
);
5731 ssh2_pkt_adduint32(ssh
, c
->v
.v2
.locwindow
);
5732 ssh2_pkt_adduint32(ssh
, 0x4000UL
); /* our max pkt size */
5736 bombout(("Strange packet received: type %d", ssh
->pktin
.type
));
5741 * We have spare data. Add it to the channel buffer.
5743 ssh2_add_channel_data(ssh
->mainchan
, in
, inlen
);
5748 struct ssh_channel
*c
;
5750 * Try to send data on all channels if we can.
5752 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
5753 int bufsize
= ssh2_try_send(c
);
5756 case CHAN_MAINSESSION
:
5757 /* stdin need not receive an unthrottle
5758 * notification since it will be polled */
5761 x11_unthrottle(c
->u
.x11
.s
);
5764 /* agent sockets are request/response and need no
5765 * buffer management */
5768 pfd_unthrottle(c
->u
.pfd
.s
);
5780 * Handle the top-level SSH2 protocol.
5782 static void ssh2_protocol(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
5784 if (do_ssh2_transport(ssh
, in
, inlen
, ispkt
) == 0)
5786 do_ssh2_authconn(ssh
, in
, inlen
, ispkt
);
5790 * Called to set up the connection.
5792 * Returns an error message, or NULL on success.
5794 static char *ssh_init(void *frontend_handle
, void **backend_handle
,
5795 char *host
, int port
, char **realhost
, int nodelay
)
5800 ssh
= smalloc(sizeof(*ssh
));
5803 ssh
->v1_cipher_ctx
= NULL
;
5804 ssh
->cscipher
= NULL
;
5805 ssh
->cs_cipher_ctx
= NULL
;
5806 ssh
->sccipher
= NULL
;
5807 ssh
->sc_cipher_ctx
= NULL
;
5809 ssh
->sc_mac_ctx
= NULL
;
5811 ssh
->sc_mac_ctx
= NULL
;
5815 ssh
->hostkey
= NULL
;
5817 ssh
->state
= SSH_STATE_PREPACKET
;
5818 ssh
->size_needed
= FALSE
;
5819 ssh
->eof_needed
= FALSE
;
5821 static const struct Packet empty
= { 0, 0, NULL
, NULL
, 0 };
5822 ssh
->pktin
= ssh
->pktout
= empty
;
5824 ssh
->deferred_send_data
= NULL
;
5825 ssh
->deferred_len
= 0;
5826 ssh
->deferred_size
= 0;
5827 ssh
->fallback_cmd
= 0;
5829 ssh
->v2_outgoing_sequence
= 0;
5830 ssh
->ssh1_rdpkt_crstate
= 0;
5831 ssh
->ssh2_rdpkt_crstate
= 0;
5832 ssh
->do_ssh_init_crstate
= 0;
5833 ssh
->ssh_gotdata_crstate
= 0;
5834 ssh
->ssh1_protocol_crstate
= 0;
5835 ssh
->do_ssh1_login_crstate
= 0;
5836 ssh
->do_ssh2_transport_crstate
= 0;
5837 ssh
->do_ssh2_authconn_crstate
= 0;
5838 ssh
->do_ssh_init_state
= NULL
;
5839 ssh
->do_ssh1_login_state
= NULL
;
5840 ssh
->do_ssh2_transport_state
= NULL
;
5841 ssh
->do_ssh2_authconn_state
= NULL
;
5843 *backend_handle
= ssh
;
5846 if (crypto_startup() == 0)
5847 return "Microsoft high encryption pack not installed!";
5850 ssh
->frontend
= frontend_handle
;
5851 ssh
->term_width
= cfg
.width
;
5852 ssh
->term_height
= cfg
.height
;
5857 ssh
->v1_throttle_count
= 0;
5858 ssh
->overall_bufsize
= 0;
5859 ssh
->fallback_cmd
= 0;
5861 p
= connect_to_host(ssh
, host
, port
, realhost
, nodelay
);
5869 * Called to send data down the Telnet connection.
5871 static int ssh_send(void *handle
, char *buf
, int len
)
5873 Ssh ssh
= (Ssh
) handle
;
5875 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
5878 ssh
->protocol(ssh
, buf
, len
, 0);
5880 return ssh_sendbuffer(ssh
);
5884 * Called to query the current amount of buffered stdin data.
5886 static int ssh_sendbuffer(void *handle
)
5888 Ssh ssh
= (Ssh
) handle
;
5891 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
5895 * If the SSH socket itself has backed up, add the total backup
5896 * size on that to any individual buffer on the stdin channel.
5899 if (ssh
->throttled_all
)
5900 override_value
= ssh
->overall_bufsize
;
5902 if (ssh
->version
== 1) {
5903 return override_value
;
5904 } else if (ssh
->version
== 2) {
5905 if (!ssh
->mainchan
|| ssh
->mainchan
->closes
> 0)
5906 return override_value
;
5908 return (override_value
+
5909 bufchain_size(&ssh
->mainchan
->v
.v2
.outbuffer
));
5916 * Called to set the size of the window from SSH's POV.
5918 static void ssh_size(void *handle
, int width
, int height
)
5920 Ssh ssh
= (Ssh
) handle
;
5922 ssh
->term_width
= width
;
5923 ssh
->term_height
= height
;
5925 switch (ssh
->state
) {
5926 case SSH_STATE_BEFORE_SIZE
:
5927 case SSH_STATE_PREPACKET
:
5928 case SSH_STATE_CLOSED
:
5929 break; /* do nothing */
5930 case SSH_STATE_INTERMED
:
5931 ssh
->size_needed
= TRUE
; /* buffer for later */
5933 case SSH_STATE_SESSION
:
5937 if (ssh
->version
== 1) {
5938 send_packet(ssh
, SSH1_CMSG_WINDOW_SIZE
,
5939 PKT_INT
, ssh
->term_height
,
5940 PKT_INT
, ssh
->term_width
,
5941 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
5943 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5944 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
5945 ssh2_pkt_addstring(ssh
, "window-change");
5946 ssh2_pkt_addbool(ssh
, 0);
5947 ssh2_pkt_adduint32(ssh
, ssh
->term_width
);
5948 ssh2_pkt_adduint32(ssh
, ssh
->term_height
);
5949 ssh2_pkt_adduint32(ssh
, 0);
5950 ssh2_pkt_adduint32(ssh
, 0);
5959 * Send Telnet special codes. TS_EOF is useful for `plink', so you
5960 * can send an EOF and collect resulting output (e.g. `plink
5963 static void ssh_special(void *handle
, Telnet_Special code
)
5965 Ssh ssh
= (Ssh
) handle
;
5967 if (code
== TS_EOF
) {
5968 if (ssh
->state
!= SSH_STATE_SESSION
) {
5970 * Buffer the EOF in case we are pre-SESSION, so we can
5971 * send it as soon as we reach SESSION.
5974 ssh
->eof_needed
= TRUE
;
5977 if (ssh
->version
== 1) {
5978 send_packet(ssh
, SSH1_CMSG_EOF
, PKT_END
);
5980 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_EOF
);
5981 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
5984 logevent("Sent EOF message");
5985 } else if (code
== TS_PING
) {
5986 if (ssh
->state
== SSH_STATE_CLOSED
5987 || ssh
->state
== SSH_STATE_PREPACKET
) return;
5988 if (ssh
->version
== 1) {
5989 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
))
5990 send_packet(ssh
, SSH1_MSG_IGNORE
, PKT_STR
, "", PKT_END
);
5992 ssh2_pkt_init(ssh
, SSH2_MSG_IGNORE
);
5993 ssh2_pkt_addstring_start(ssh
);
6001 void *new_sock_channel(void *handle
, Socket s
)
6003 Ssh ssh
= (Ssh
) handle
;
6004 struct ssh_channel
*c
;
6005 c
= smalloc(sizeof(struct ssh_channel
));
6009 c
->remoteid
= -1; /* to be set when open confirmed */
6010 c
->localid
= alloc_channel_id(ssh
);
6012 c
->type
= CHAN_SOCKDATA_DORMANT
;/* identify channel type */
6014 bufchain_init(&c
->v
.v2
.outbuffer
);
6015 add234(ssh
->channels
, c
);
6021 * This is called when stdout/stderr (the entity to which
6022 * from_backend sends data) manages to clear some backlog.
6024 void ssh_unthrottle(void *handle
, int bufsize
)
6026 Ssh ssh
= (Ssh
) handle
;
6027 if (ssh
->version
== 1) {
6028 if (ssh
->v1_stdout_throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
6029 ssh
->v1_stdout_throttling
= 0;
6030 ssh1_throttle(ssh
, -1);
6033 if (ssh
->mainchan
&& ssh
->mainchan
->closes
== 0)
6034 ssh2_set_window(ssh
->mainchan
, OUR_V2_WINSIZE
- bufsize
);
6038 void ssh_send_port_open(void *handle
, void *channel
, char *hostname
,
6039 int port
, char *org
)
6041 Ssh ssh
= (Ssh
) handle
;
6042 struct ssh_channel
*c
= (struct ssh_channel
*)channel
;
6045 sprintf(buf
, "Opening forwarded connection to %.512s:%d", hostname
, port
);
6048 if (ssh
->version
== 1) {
6049 send_packet(ssh
, SSH1_MSG_PORT_OPEN
,
6050 PKT_INT
, c
->localid
,
6053 //PKT_STR, <org:orgport>,
6056 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_OPEN
);
6057 ssh2_pkt_addstring(ssh
, "direct-tcpip");
6058 ssh2_pkt_adduint32(ssh
, c
->localid
);
6059 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
6060 ssh2_pkt_adduint32(ssh
, c
->v
.v2
.locwindow
);/* our window size */
6061 ssh2_pkt_adduint32(ssh
, 0x4000UL
); /* our max pkt size */
6062 ssh2_pkt_addstring(ssh
, hostname
);
6063 ssh2_pkt_adduint32(ssh
, port
);
6065 * We make up values for the originator data; partly it's
6066 * too much hassle to keep track, and partly I'm not
6067 * convinced the server should be told details like that
6068 * about my local network configuration.
6070 ssh2_pkt_addstring(ssh
, "client-side-connection");
6071 ssh2_pkt_adduint32(ssh
, 0);
6077 static Socket
ssh_socket(void *handle
)
6079 Ssh ssh
= (Ssh
) handle
;
6083 static int ssh_sendok(void *handle
)
6085 Ssh ssh
= (Ssh
) handle
;
6086 return ssh
->send_ok
;
6089 static int ssh_ldisc(void *handle
, int option
)
6091 Ssh ssh
= (Ssh
) handle
;
6092 if (option
== LD_ECHO
)
6093 return ssh
->echoing
;
6094 if (option
== LD_EDIT
)
6095 return ssh
->editing
;
6099 static int ssh_return_exitcode(void *handle
)
6101 Ssh ssh
= (Ssh
) handle
;
6102 return ssh
->exitcode
;
6106 * Gross hack: pscp will try to start SFTP but fall back to scp1 if
6107 * that fails. This variable is the means by which scp.c can reach
6108 * into the SSH code and find out which one it got.
6110 extern int ssh_fallback_cmd(void *handle
)
6112 Ssh ssh
= (Ssh
) handle
;
6113 return ssh
->fallback_cmd
;
6116 Backend ssh_backend
= {
6123 ssh_return_exitcode
,