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
;
564 const struct ssh2_cipher
*cscipher
, *sccipher
;
565 void *cs_cipher_ctx
, *sc_cipher_ctx
;
566 const struct ssh_mac
*csmac
, *scmac
;
567 void *cs_mac_ctx
, *sc_mac_ctx
;
568 const struct ssh_compress
*cscomp
, *sccomp
;
569 const struct ssh_kex
*kex
;
570 const struct ssh_signkey
*hostkey
;
571 unsigned char v2_session_id
[20];
577 int echoing
, editing
;
581 int term_width
, term_height
;
583 tree234
*channels
; /* indexed by local id */
584 struct ssh_channel
*mainchan
; /* primary session channel */
591 SSH_STATE_BEFORE_SIZE
,
597 int size_needed
, eof_needed
;
600 struct Packet pktout
;
601 unsigned char *deferred_send_data
;
602 int deferred_len
, deferred_size
;
605 * Gross hack: pscp will try to start SFTP but fall back to
606 * scp1 if that fails. This variable is the means by which
607 * scp.c can reach into the SSH code and find out which one it
613 * Used for username and password input.
615 char *userpass_input_buffer
;
616 int userpass_input_buflen
;
617 int userpass_input_bufpos
;
618 int userpass_input_echo
;
620 char *portfwd_strptr
;
624 int v1_throttle_count
;
627 int v1_stdout_throttling
;
628 int v2_outgoing_sequence
;
630 int ssh1_rdpkt_crstate
;
631 int ssh2_rdpkt_crstate
;
632 int do_ssh_init_crstate
;
633 int ssh_gotdata_crstate
;
634 int ssh1_protocol_crstate
;
635 int do_ssh1_login_crstate
;
636 int do_ssh2_transport_crstate
;
637 int do_ssh2_authconn_crstate
;
639 void *do_ssh_init_state
;
640 void *do_ssh1_login_state
;
641 void *do_ssh2_transport_state
;
642 void *do_ssh2_authconn_state
;
644 struct rdpkt1_state_tag rdpkt1_state
;
645 struct rdpkt2_state_tag rdpkt2_state
;
647 void (*protocol
) (Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
);
648 int (*s_rdpkt
) (Ssh ssh
, unsigned char **data
, int *datalen
);
651 static int ssh_channelcmp(void *av
, void *bv
)
653 struct ssh_channel
*a
= (struct ssh_channel
*) av
;
654 struct ssh_channel
*b
= (struct ssh_channel
*) bv
;
655 if (a
->localid
< b
->localid
)
657 if (a
->localid
> b
->localid
)
661 static int ssh_channelfind(void *av
, void *bv
)
663 unsigned *a
= (unsigned *) av
;
664 struct ssh_channel
*b
= (struct ssh_channel
*) bv
;
672 static int ssh_rportcmp_ssh1(void *av
, void *bv
)
674 struct ssh_rportfwd
*a
= (struct ssh_rportfwd
*) av
;
675 struct ssh_rportfwd
*b
= (struct ssh_rportfwd
*) bv
;
677 if ( (i
= strcmp(a
->dhost
, b
->dhost
)) != 0)
678 return i
< 0 ?
-1 : +1;
679 if (a
->dport
> b
->dport
)
681 if (a
->dport
< b
->dport
)
686 static int ssh_rportcmp_ssh2(void *av
, void *bv
)
688 struct ssh_rportfwd
*a
= (struct ssh_rportfwd
*) av
;
689 struct ssh_rportfwd
*b
= (struct ssh_rportfwd
*) bv
;
691 if (a
->sport
> b
->sport
)
693 if (a
->sport
< b
->sport
)
698 static int alloc_channel_id(Ssh ssh
)
700 const unsigned CHANNEL_NUMBER_OFFSET
= 256;
701 unsigned low
, high
, mid
;
703 struct ssh_channel
*c
;
706 * First-fit allocation of channel numbers: always pick the
707 * lowest unused one. To do this, binary-search using the
708 * counted B-tree to find the largest channel ID which is in a
709 * contiguous sequence from the beginning. (Precisely
710 * everything in that sequence must have ID equal to its tree
711 * index plus CHANNEL_NUMBER_OFFSET.)
713 tsize
= count234(ssh
->channels
);
717 while (high
- low
> 1) {
718 mid
= (high
+ low
) / 2;
719 c
= index234(ssh
->channels
, mid
);
720 if (c
->localid
== mid
+ CHANNEL_NUMBER_OFFSET
)
721 low
= mid
; /* this one is fine */
723 high
= mid
; /* this one is past it */
726 * Now low points to either -1, or the tree index of the
727 * largest ID in the initial sequence.
730 unsigned i
= low
+ 1 + CHANNEL_NUMBER_OFFSET
;
731 assert(NULL
== find234(ssh
->channels
, &i
, ssh_channelfind
));
733 return low
+ 1 + CHANNEL_NUMBER_OFFSET
;
736 static void c_write(Ssh ssh
, char *buf
, int len
)
738 if ((flags
& FLAG_STDERR
)) {
740 for (i
= 0; i
< len
; i
++)
742 fputc(buf
[i
], stderr
);
745 from_backend(ssh
->frontend
, 1, buf
, len
);
748 static void c_write_untrusted(Ssh ssh
, char *buf
, int len
)
751 for (i
= 0; i
< len
; i
++) {
753 c_write(ssh
, "\r\n", 2);
754 else if ((buf
[i
] & 0x60) || (buf
[i
] == '\r'))
755 c_write(ssh
, buf
+ i
, 1);
759 static void c_write_str(Ssh ssh
, char *buf
)
761 c_write(ssh
, buf
, strlen(buf
));
765 * Collect incoming data in the incoming packet buffer.
766 * Decipher and verify the packet when it is completely read.
767 * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets.
768 * Update the *data and *datalen variables.
769 * Return the additional nr of bytes needed, or 0 when
770 * a complete packet is available.
772 static int ssh1_rdpkt(Ssh ssh
, unsigned char **data
, int *datalen
)
774 struct rdpkt1_state_tag
*st
= &ssh
->rdpkt1_state
;
776 crBegin(ssh
->ssh1_rdpkt_crstate
);
781 ssh
->pktin
.length
= 0;
783 for (st
->i
= st
->len
= 0; st
->i
< 4; st
->i
++) {
784 while ((*datalen
) == 0)
786 st
->len
= (st
->len
<< 8) + **data
;
787 (*data
)++, (*datalen
)--;
790 st
->pad
= 8 - (st
->len
% 8);
791 st
->biglen
= st
->len
+ st
->pad
;
792 ssh
->pktin
.length
= st
->len
- 5;
794 if (ssh
->pktin
.maxlen
< st
->biglen
) {
795 ssh
->pktin
.maxlen
= st
->biglen
;
796 ssh
->pktin
.data
= srealloc(ssh
->pktin
.data
, st
->biglen
+ APIEXTRA
);
799 st
->to_read
= st
->biglen
;
800 st
->p
= ssh
->pktin
.data
;
801 while (st
->to_read
> 0) {
802 st
->chunk
= st
->to_read
;
803 while ((*datalen
) == 0)
804 crReturn(st
->to_read
);
805 if (st
->chunk
> (*datalen
))
806 st
->chunk
= (*datalen
);
807 memcpy(st
->p
, *data
, st
->chunk
);
809 *datalen
-= st
->chunk
;
811 st
->to_read
-= st
->chunk
;
814 if (ssh
->cipher
&& detect_attack(ssh
->crcda_ctx
, ssh
->pktin
.data
,
816 bombout(("Network attack (CRC compensation) detected!"));
821 ssh
->cipher
->decrypt(ssh
->v1_cipher_ctx
, ssh
->pktin
.data
, st
->biglen
);
823 st
->realcrc
= crc32(ssh
->pktin
.data
, st
->biglen
- 4);
824 st
->gotcrc
= GET_32BIT(ssh
->pktin
.data
+ st
->biglen
- 4);
825 if (st
->gotcrc
!= st
->realcrc
) {
826 bombout(("Incorrect CRC received on packet"));
830 ssh
->pktin
.body
= ssh
->pktin
.data
+ st
->pad
+ 1;
832 if (ssh
->v1_compressing
) {
833 unsigned char *decompblk
;
835 zlib_decompress_block(ssh
->pktin
.body
- 1, ssh
->pktin
.length
+ 1,
836 &decompblk
, &decomplen
);
838 if (ssh
->pktin
.maxlen
< st
->pad
+ decomplen
) {
839 ssh
->pktin
.maxlen
= st
->pad
+ decomplen
;
840 ssh
->pktin
.data
= srealloc(ssh
->pktin
.data
,
841 ssh
->pktin
.maxlen
+ APIEXTRA
);
842 ssh
->pktin
.body
= ssh
->pktin
.data
+ st
->pad
+ 1;
845 memcpy(ssh
->pktin
.body
- 1, decompblk
, decomplen
);
847 ssh
->pktin
.length
= decomplen
- 1;
850 ssh
->pktin
.type
= ssh
->pktin
.body
[-1];
852 log_packet(PKT_INCOMING
, ssh
->pktin
.type
, ssh1_pkt_type(ssh
->pktin
.type
),
853 ssh
->pktin
.body
, ssh
->pktin
.length
);
855 if (ssh
->pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
856 ssh
->pktin
.type
== SSH1_SMSG_STDERR_DATA
||
857 ssh
->pktin
.type
== SSH1_MSG_DEBUG
||
858 ssh
->pktin
.type
== SSH1_SMSG_AUTH_TIS_CHALLENGE
||
859 ssh
->pktin
.type
== SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
860 long stringlen
= GET_32BIT(ssh
->pktin
.body
);
861 if (stringlen
+ 4 != ssh
->pktin
.length
) {
862 bombout(("Received data packet with bogus string length"));
867 if (ssh
->pktin
.type
== SSH1_MSG_DEBUG
) {
868 /* log debug message */
870 int stringlen
= GET_32BIT(ssh
->pktin
.body
);
871 strcpy(buf
, "Remote debug message: ");
874 memcpy(buf
+ 8, ssh
->pktin
.body
+ 4, stringlen
);
875 buf
[8 + stringlen
] = '\0';
878 } else if (ssh
->pktin
.type
== SSH1_MSG_IGNORE
) {
883 if (ssh
->pktin
.type
== SSH1_MSG_DISCONNECT
) {
884 /* log reason code in disconnect message */
886 unsigned msglen
= GET_32BIT(ssh
->pktin
.body
);
888 strcpy(buf
, "Remote sent disconnect: ");
889 nowlen
= strlen(buf
);
890 if (msglen
> sizeof(buf
) - nowlen
- 1)
891 msglen
= sizeof(buf
) - nowlen
- 1;
892 memcpy(buf
+ nowlen
, ssh
->pktin
.body
+ 4, msglen
);
893 buf
[nowlen
+ msglen
] = '\0';
894 /* logevent(buf); (this is now done within the bombout macro) */
895 bombout(("Server sent disconnect message:\n\"%s\"", buf
+nowlen
));
902 static int ssh2_rdpkt(Ssh ssh
, unsigned char **data
, int *datalen
)
904 struct rdpkt2_state_tag
*st
= &ssh
->rdpkt2_state
;
906 crBegin(ssh
->ssh2_rdpkt_crstate
);
910 ssh
->pktin
.length
= 0;
912 st
->cipherblk
= ssh
->sccipher
->blksize
;
915 if (st
->cipherblk
< 8)
918 if (ssh
->pktin
.maxlen
< st
->cipherblk
) {
919 ssh
->pktin
.maxlen
= st
->cipherblk
;
920 ssh
->pktin
.data
= srealloc(ssh
->pktin
.data
, st
->cipherblk
+ APIEXTRA
);
924 * Acquire and decrypt the first block of the packet. This will
925 * contain the length and padding details.
927 for (st
->i
= st
->len
= 0; st
->i
< st
->cipherblk
; st
->i
++) {
928 while ((*datalen
) == 0)
929 crReturn(st
->cipherblk
- st
->i
);
930 ssh
->pktin
.data
[st
->i
] = *(*data
)++;
935 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
936 ssh
->pktin
.data
, st
->cipherblk
);
939 * Now get the length and padding figures.
941 st
->len
= GET_32BIT(ssh
->pktin
.data
);
942 st
->pad
= ssh
->pktin
.data
[4];
945 * _Completely_ silly lengths should be stomped on before they
946 * do us any more damage.
948 if (st
->len
< 0 || st
->pad
< 0 || st
->len
+ st
->pad
< 0) {
949 bombout(("Incoming packet was garbled on decryption"));
954 * This enables us to deduce the payload length.
956 st
->payload
= st
->len
- st
->pad
- 1;
958 ssh
->pktin
.length
= st
->payload
+ 5;
961 * So now we can work out the total packet length.
963 st
->packetlen
= st
->len
+ 4;
964 st
->maclen
= ssh
->scmac ? ssh
->scmac
->len
: 0;
967 * Adjust memory allocation if packet is too big.
969 if (ssh
->pktin
.maxlen
< st
->packetlen
+ st
->maclen
) {
970 ssh
->pktin
.maxlen
= st
->packetlen
+ st
->maclen
;
971 ssh
->pktin
.data
= srealloc(ssh
->pktin
.data
,
972 ssh
->pktin
.maxlen
+ APIEXTRA
);
976 * Read and decrypt the remainder of the packet.
978 for (st
->i
= st
->cipherblk
; st
->i
< st
->packetlen
+ st
->maclen
;
980 while ((*datalen
) == 0)
981 crReturn(st
->packetlen
+ st
->maclen
- st
->i
);
982 ssh
->pktin
.data
[st
->i
] = *(*data
)++;
985 /* Decrypt everything _except_ the MAC. */
987 ssh
->sccipher
->decrypt(ssh
->sc_cipher_ctx
,
988 ssh
->pktin
.data
+ st
->cipherblk
,
989 st
->packetlen
- st
->cipherblk
);
995 && !ssh
->scmac
->verify(ssh
->sc_mac_ctx
, ssh
->pktin
.data
, st
->len
+ 4,
996 st
->incoming_sequence
)) {
997 bombout(("Incorrect MAC received on packet"));
1000 st
->incoming_sequence
++; /* whether or not we MACed */
1003 * Decompress packet payload.
1006 unsigned char *newpayload
;
1009 ssh
->sccomp
->decompress(ssh
->pktin
.data
+ 5, ssh
->pktin
.length
- 5,
1010 &newpayload
, &newlen
)) {
1011 if (ssh
->pktin
.maxlen
< newlen
+ 5) {
1012 ssh
->pktin
.maxlen
= newlen
+ 5;
1013 ssh
->pktin
.data
= srealloc(ssh
->pktin
.data
,
1014 ssh
->pktin
.maxlen
+ APIEXTRA
);
1016 ssh
->pktin
.length
= 5 + newlen
;
1017 memcpy(ssh
->pktin
.data
+ 5, newpayload
, newlen
);
1022 ssh
->pktin
.savedpos
= 6;
1023 ssh
->pktin
.type
= ssh
->pktin
.data
[5];
1025 log_packet(PKT_INCOMING
, ssh
->pktin
.type
,
1026 ssh2_pkt_type(ssh
->pkt_ctx
, ssh
->pktin
.type
),
1027 ssh
->pktin
.data
+6, ssh
->pktin
.length
-6);
1029 switch (ssh
->pktin
.type
) {
1031 * These packets we must handle instantly.
1033 case SSH2_MSG_DISCONNECT
:
1035 /* log reason code in disconnect message */
1037 int reason
= GET_32BIT(ssh
->pktin
.data
+ 6);
1038 unsigned msglen
= GET_32BIT(ssh
->pktin
.data
+ 10);
1040 if (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) {
1041 sprintf(buf
, "Received disconnect message (%s)",
1042 ssh2_disconnect_reasons
[reason
]);
1044 sprintf(buf
, "Received disconnect message (unknown type %d)",
1048 strcpy(buf
, "Disconnection message text: ");
1049 nowlen
= strlen(buf
);
1050 if (msglen
> sizeof(buf
) - nowlen
- 1)
1051 msglen
= sizeof(buf
) - nowlen
- 1;
1052 memcpy(buf
+ nowlen
, ssh
->pktin
.data
+ 14, msglen
);
1053 buf
[nowlen
+ msglen
] = '\0';
1055 bombout(("Server sent disconnect message\ntype %d (%s):\n\"%s\"",
1057 (reason
> 0 && reason
< lenof(ssh2_disconnect_reasons
)) ?
1058 ssh2_disconnect_reasons
[reason
] : "unknown",
1063 case SSH2_MSG_IGNORE
:
1065 case SSH2_MSG_DEBUG
:
1067 /* log the debug message */
1069 /* int display = ssh->pktin.body[6]; */
1070 int stringlen
= GET_32BIT(ssh
->pktin
.data
+7);
1072 strcpy(buf
, "Remote debug message: ");
1073 prefix
= strlen(buf
);
1074 if (stringlen
> (int)(sizeof(buf
)-prefix
-1))
1075 stringlen
= sizeof(buf
)-prefix
-1;
1076 memcpy(buf
+ prefix
, ssh
->pktin
.data
+ 11, stringlen
);
1077 buf
[prefix
+ stringlen
] = '\0';
1080 goto next_packet
; /* FIXME: print the debug message */
1083 * These packets we need do nothing about here.
1085 case SSH2_MSG_UNIMPLEMENTED
:
1086 case SSH2_MSG_SERVICE_REQUEST
:
1087 case SSH2_MSG_SERVICE_ACCEPT
:
1088 case SSH2_MSG_KEXINIT
:
1089 case SSH2_MSG_NEWKEYS
:
1090 case SSH2_MSG_KEXDH_INIT
:
1091 case SSH2_MSG_KEXDH_REPLY
:
1092 /* case SSH2_MSG_KEX_DH_GEX_REQUEST: duplicate case value */
1093 /* case SSH2_MSG_KEX_DH_GEX_GROUP: duplicate case value */
1094 case SSH2_MSG_KEX_DH_GEX_INIT
:
1095 case SSH2_MSG_KEX_DH_GEX_REPLY
:
1096 case SSH2_MSG_USERAUTH_REQUEST
:
1097 case SSH2_MSG_USERAUTH_FAILURE
:
1098 case SSH2_MSG_USERAUTH_SUCCESS
:
1099 case SSH2_MSG_USERAUTH_BANNER
:
1100 case SSH2_MSG_USERAUTH_PK_OK
:
1101 /* case SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ: duplicate case value */
1102 /* case SSH2_MSG_USERAUTH_INFO_REQUEST: duplicate case value */
1103 case SSH2_MSG_USERAUTH_INFO_RESPONSE
:
1104 case SSH2_MSG_GLOBAL_REQUEST
:
1105 case SSH2_MSG_REQUEST_SUCCESS
:
1106 case SSH2_MSG_REQUEST_FAILURE
:
1107 case SSH2_MSG_CHANNEL_OPEN
:
1108 case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
:
1109 case SSH2_MSG_CHANNEL_OPEN_FAILURE
:
1110 case SSH2_MSG_CHANNEL_WINDOW_ADJUST
:
1111 case SSH2_MSG_CHANNEL_DATA
:
1112 case SSH2_MSG_CHANNEL_EXTENDED_DATA
:
1113 case SSH2_MSG_CHANNEL_EOF
:
1114 case SSH2_MSG_CHANNEL_CLOSE
:
1115 case SSH2_MSG_CHANNEL_REQUEST
:
1116 case SSH2_MSG_CHANNEL_SUCCESS
:
1117 case SSH2_MSG_CHANNEL_FAILURE
:
1121 * For anything else we send SSH2_MSG_UNIMPLEMENTED.
1124 ssh2_pkt_init(ssh
, SSH2_MSG_UNIMPLEMENTED
);
1125 ssh2_pkt_adduint32(ssh
, st
->incoming_sequence
- 1);
1133 static void ssh1_pktout_size(Ssh ssh
, int len
)
1137 len
+= 5; /* type and CRC */
1138 pad
= 8 - (len
% 8);
1141 ssh
->pktout
.length
= len
- 5;
1142 if (ssh
->pktout
.maxlen
< biglen
) {
1143 ssh
->pktout
.maxlen
= biglen
;
1145 /* Allocate enough buffer space for extra block
1146 * for MS CryptEncrypt() */
1147 ssh
->pktout
.data
= srealloc(ssh
->pktout
.data
, biglen
+ 12);
1149 ssh
->pktout
.data
= srealloc(ssh
->pktout
.data
, biglen
+ 4);
1152 ssh
->pktout
.body
= ssh
->pktout
.data
+ 4 + pad
+ 1;
1155 static void s_wrpkt_start(Ssh ssh
, int type
, int len
)
1157 ssh1_pktout_size(ssh
, len
);
1158 ssh
->pktout
.type
= type
;
1161 static int s_wrpkt_prepare(Ssh ssh
)
1163 int pad
, len
, biglen
, i
;
1166 ssh
->pktout
.body
[-1] = ssh
->pktout
.type
;
1168 log_packet(PKT_OUTGOING
, ssh
->pktout
.type
, ssh1_pkt_type(ssh
->pktout
.type
),
1169 ssh
->pktout
.body
, ssh
->pktout
.length
);
1171 if (ssh
->v1_compressing
) {
1172 unsigned char *compblk
;
1174 zlib_compress_block(ssh
->pktout
.body
- 1, ssh
->pktout
.length
+ 1,
1175 &compblk
, &complen
);
1176 ssh1_pktout_size(ssh
, complen
- 1);
1177 memcpy(ssh
->pktout
.body
- 1, compblk
, complen
);
1181 len
= ssh
->pktout
.length
+ 5; /* type and CRC */
1182 pad
= 8 - (len
% 8);
1185 for (i
= 0; i
< pad
; i
++)
1186 ssh
->pktout
.data
[i
+ 4] = random_byte();
1187 crc
= crc32(ssh
->pktout
.data
+ 4, biglen
- 4);
1188 PUT_32BIT(ssh
->pktout
.data
+ biglen
, crc
);
1189 PUT_32BIT(ssh
->pktout
.data
, len
);
1192 ssh
->cipher
->encrypt(ssh
->v1_cipher_ctx
, ssh
->pktout
.data
+ 4, biglen
);
1197 static void s_wrpkt(Ssh ssh
)
1200 len
= s_wrpkt_prepare(ssh
);
1201 backlog
= sk_write(ssh
->s
, ssh
->pktout
.data
, len
);
1202 if (backlog
> SSH_MAX_BACKLOG
)
1203 ssh_throttle_all(ssh
, 1, backlog
);
1206 static void s_wrpkt_defer(Ssh ssh
)
1209 len
= s_wrpkt_prepare(ssh
);
1210 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1211 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1212 ssh
->deferred_send_data
= srealloc(ssh
->deferred_send_data
,
1213 ssh
->deferred_size
);
1215 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, ssh
->pktout
.data
, len
);
1216 ssh
->deferred_len
+= len
;
1220 * Construct a packet with the specified contents.
1222 static void construct_packet(Ssh ssh
, int pkttype
, va_list ap1
, va_list ap2
)
1224 unsigned char *p
, *argp
, argchar
;
1225 unsigned long argint
;
1226 int pktlen
, argtype
, arglen
;
1230 while ((argtype
= va_arg(ap1
, int)) != PKT_END
) {
1233 (void) va_arg(ap1
, int);
1237 (void) va_arg(ap1
, char);
1241 (void) va_arg(ap1
, unsigned char *);
1242 arglen
= va_arg(ap1
, int);
1246 argp
= va_arg(ap1
, unsigned char *);
1247 arglen
= strlen(argp
);
1248 pktlen
+= 4 + arglen
;
1251 bn
= va_arg(ap1
, Bignum
);
1252 pktlen
+= ssh1_bignum_length(bn
);
1259 s_wrpkt_start(ssh
, pkttype
, pktlen
);
1260 p
= ssh
->pktout
.body
;
1262 while ((argtype
= va_arg(ap2
, int)) != PKT_END
) {
1265 argint
= va_arg(ap2
, int);
1266 PUT_32BIT(p
, argint
);
1270 argchar
= va_arg(ap2
, unsigned char);
1275 argp
= va_arg(ap2
, unsigned char *);
1276 arglen
= va_arg(ap2
, int);
1277 memcpy(p
, argp
, arglen
);
1281 argp
= va_arg(ap2
, unsigned char *);
1282 arglen
= strlen(argp
);
1283 PUT_32BIT(p
, arglen
);
1284 memcpy(p
+ 4, argp
, arglen
);
1288 bn
= va_arg(ap2
, Bignum
);
1289 p
+= ssh1_write_bignum(p
, bn
);
1295 static void send_packet(Ssh ssh
, int pkttype
, ...)
1298 va_start(ap1
, pkttype
);
1299 va_start(ap2
, pkttype
);
1300 construct_packet(ssh
, pkttype
, ap1
, ap2
);
1304 static void defer_packet(Ssh ssh
, int pkttype
, ...)
1307 va_start(ap1
, pkttype
);
1308 va_start(ap2
, pkttype
);
1309 construct_packet(ssh
, pkttype
, ap1
, ap2
);
1313 static int ssh_versioncmp(char *a
, char *b
)
1316 unsigned long av
, bv
;
1318 av
= strtoul(a
, &ae
, 10);
1319 bv
= strtoul(b
, &be
, 10);
1321 return (av
< bv ?
-1 : +1);
1326 av
= strtoul(ae
, &ae
, 10);
1327 bv
= strtoul(be
, &be
, 10);
1329 return (av
< bv ?
-1 : +1);
1334 * Utility routines for putting an SSH-protocol `string' and
1335 * `uint32' into a SHA state.
1338 static void sha_string(SHA_State
* s
, void *str
, int len
)
1340 unsigned char lenblk
[4];
1341 PUT_32BIT(lenblk
, len
);
1342 SHA_Bytes(s
, lenblk
, 4);
1343 SHA_Bytes(s
, str
, len
);
1346 static void sha_uint32(SHA_State
* s
, unsigned i
)
1348 unsigned char intblk
[4];
1349 PUT_32BIT(intblk
, i
);
1350 SHA_Bytes(s
, intblk
, 4);
1354 * SSH2 packet construction functions.
1356 static void ssh2_pkt_ensure(Ssh ssh
, int length
)
1358 if (ssh
->pktout
.maxlen
< length
) {
1359 ssh
->pktout
.maxlen
= length
+ 256;
1360 ssh
->pktout
.data
= srealloc(ssh
->pktout
.data
,
1361 ssh
->pktout
.maxlen
+ APIEXTRA
);
1362 if (!ssh
->pktout
.data
)
1363 fatalbox("Out of memory");
1366 static void ssh2_pkt_adddata(Ssh ssh
, void *data
, int len
)
1368 ssh
->pktout
.length
+= len
;
1369 ssh2_pkt_ensure(ssh
, ssh
->pktout
.length
);
1370 memcpy(ssh
->pktout
.data
+ ssh
->pktout
.length
- len
, data
, len
);
1372 static void ssh2_pkt_addbyte(Ssh ssh
, unsigned char byte
)
1374 ssh2_pkt_adddata(ssh
, &byte
, 1);
1376 static void ssh2_pkt_init(Ssh ssh
, int pkt_type
)
1378 ssh
->pktout
.length
= 5;
1379 ssh2_pkt_addbyte(ssh
, (unsigned char) pkt_type
);
1381 static void ssh2_pkt_addbool(Ssh ssh
, unsigned char value
)
1383 ssh2_pkt_adddata(ssh
, &value
, 1);
1385 static void ssh2_pkt_adduint32(Ssh ssh
, unsigned long value
)
1388 PUT_32BIT(x
, value
);
1389 ssh2_pkt_adddata(ssh
, x
, 4);
1391 static void ssh2_pkt_addstring_start(Ssh ssh
)
1393 ssh2_pkt_adduint32(ssh
, 0);
1394 ssh
->pktout
.savedpos
= ssh
->pktout
.length
;
1396 static void ssh2_pkt_addstring_str(Ssh ssh
, char *data
)
1398 ssh2_pkt_adddata(ssh
, data
, strlen(data
));
1399 PUT_32BIT(ssh
->pktout
.data
+ ssh
->pktout
.savedpos
- 4,
1400 ssh
->pktout
.length
- ssh
->pktout
.savedpos
);
1402 static void ssh2_pkt_addstring_data(Ssh ssh
, char *data
, int len
)
1404 ssh2_pkt_adddata(ssh
, data
, len
);
1405 PUT_32BIT(ssh
->pktout
.data
+ ssh
->pktout
.savedpos
- 4,
1406 ssh
->pktout
.length
- ssh
->pktout
.savedpos
);
1408 static void ssh2_pkt_addstring(Ssh ssh
, char *data
)
1410 ssh2_pkt_addstring_start(ssh
);
1411 ssh2_pkt_addstring_str(ssh
, data
);
1413 static char *ssh2_mpint_fmt(Bignum b
, int *len
)
1416 int i
, n
= (bignum_bitcount(b
) + 7) / 8;
1419 fatalbox("out of memory");
1421 for (i
= 1; i
<= n
; i
++)
1422 p
[i
] = bignum_byte(b
, n
- i
);
1424 while (i
<= n
&& p
[i
] == 0 && (p
[i
+ 1] & 0x80) == 0)
1426 memmove(p
, p
+ i
, n
+ 1 - i
);
1430 static void ssh2_pkt_addmp(Ssh ssh
, Bignum b
)
1434 p
= ssh2_mpint_fmt(b
, &len
);
1435 ssh2_pkt_addstring_start(ssh
);
1436 ssh2_pkt_addstring_data(ssh
, p
, len
);
1441 * Construct an SSH2 final-form packet: compress it, encrypt it,
1442 * put the MAC on it. Final packet, ready to be sent, is stored in
1443 * ssh->pktout.data. Total length is returned.
1445 static int ssh2_pkt_construct(Ssh ssh
)
1447 int cipherblk
, maclen
, padding
, i
;
1449 log_packet(PKT_OUTGOING
, ssh
->pktout
.data
[5],
1450 ssh2_pkt_type(ssh
->pkt_ctx
, ssh
->pktout
.data
[5]),
1451 ssh
->pktout
.data
+ 6, ssh
->pktout
.length
- 6);
1454 * Compress packet payload.
1457 unsigned char *newpayload
;
1460 ssh
->cscomp
->compress(ssh
->pktout
.data
+ 5, ssh
->pktout
.length
- 5,
1461 &newpayload
, &newlen
)) {
1462 ssh
->pktout
.length
= 5;
1463 ssh2_pkt_adddata(ssh
, newpayload
, newlen
);
1469 * Add padding. At least four bytes, and must also bring total
1470 * length (minus MAC) up to a multiple of the block size.
1472 cipherblk
= ssh
->cscipher ? ssh
->cscipher
->blksize
: 8; /* block size */
1473 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
1476 (cipherblk
- (ssh
->pktout
.length
+ padding
) % cipherblk
) % cipherblk
;
1477 maclen
= ssh
->csmac ? ssh
->csmac
->len
: 0;
1478 ssh2_pkt_ensure(ssh
, ssh
->pktout
.length
+ padding
+ maclen
);
1479 ssh
->pktout
.data
[4] = padding
;
1480 for (i
= 0; i
< padding
; i
++)
1481 ssh
->pktout
.data
[ssh
->pktout
.length
+ i
] = random_byte();
1482 PUT_32BIT(ssh
->pktout
.data
, ssh
->pktout
.length
+ padding
- 4);
1484 ssh
->csmac
->generate(ssh
->cs_mac_ctx
, ssh
->pktout
.data
,
1485 ssh
->pktout
.length
+ padding
,
1486 ssh
->v2_outgoing_sequence
);
1487 ssh
->v2_outgoing_sequence
++; /* whether or not we MACed */
1490 ssh
->cscipher
->encrypt(ssh
->cs_cipher_ctx
,
1491 ssh
->pktout
.data
, ssh
->pktout
.length
+ padding
);
1493 /* Ready-to-send packet starts at ssh->pktout.data. We return length. */
1494 return ssh
->pktout
.length
+ padding
+ maclen
;
1498 * Construct and send an SSH2 packet immediately.
1500 static void ssh2_pkt_send(Ssh ssh
)
1504 len
= ssh2_pkt_construct(ssh
);
1505 backlog
= sk_write(ssh
->s
, ssh
->pktout
.data
, len
);
1506 if (backlog
> SSH_MAX_BACKLOG
)
1507 ssh_throttle_all(ssh
, 1, backlog
);
1511 * Construct an SSH2 packet and add it to a deferred data block.
1512 * Useful for sending multiple packets in a single sk_write() call,
1513 * to prevent a traffic-analysing listener from being able to work
1514 * out the length of any particular packet (such as the password
1517 * Note that because SSH2 sequence-numbers its packets, this can
1518 * NOT be used as an m4-style `defer' allowing packets to be
1519 * constructed in one order and sent in another.
1521 static void ssh2_pkt_defer(Ssh ssh
)
1523 int len
= ssh2_pkt_construct(ssh
);
1524 if (ssh
->deferred_len
+ len
> ssh
->deferred_size
) {
1525 ssh
->deferred_size
= ssh
->deferred_len
+ len
+ 128;
1526 ssh
->deferred_send_data
= srealloc(ssh
->deferred_send_data
,
1527 ssh
->deferred_size
);
1529 memcpy(ssh
->deferred_send_data
+ ssh
->deferred_len
, ssh
->pktout
.data
, len
);
1530 ssh
->deferred_len
+= len
;
1534 * Send the whole deferred data block constructed by
1535 * ssh2_pkt_defer() or SSH1's defer_packet().
1537 static void ssh_pkt_defersend(Ssh ssh
)
1540 backlog
= sk_write(ssh
->s
, ssh
->deferred_send_data
, ssh
->deferred_len
);
1541 ssh
->deferred_len
= ssh
->deferred_size
= 0;
1542 sfree(ssh
->deferred_send_data
);
1543 ssh
->deferred_send_data
= NULL
;
1544 if (backlog
> SSH_MAX_BACKLOG
)
1545 ssh_throttle_all(ssh
, 1, backlog
);
1549 void bndebug(char *string
, Bignum b
)
1553 p
= ssh2_mpint_fmt(b
, &len
);
1554 debug(("%s", string
));
1555 for (i
= 0; i
< len
; i
++)
1556 debug((" %02x", p
[i
]));
1562 static void sha_mpint(SHA_State
* s
, Bignum b
)
1566 p
= ssh2_mpint_fmt(b
, &len
);
1567 sha_string(s
, p
, len
);
1572 * SSH2 packet decode functions.
1574 static unsigned long ssh2_pkt_getuint32(Ssh ssh
)
1576 unsigned long value
;
1577 if (ssh
->pktin
.length
- ssh
->pktin
.savedpos
< 4)
1578 return 0; /* arrgh, no way to decline (FIXME?) */
1579 value
= GET_32BIT(ssh
->pktin
.data
+ ssh
->pktin
.savedpos
);
1580 ssh
->pktin
.savedpos
+= 4;
1583 static int ssh2_pkt_getbool(Ssh ssh
)
1585 unsigned long value
;
1586 if (ssh
->pktin
.length
- ssh
->pktin
.savedpos
< 1)
1587 return 0; /* arrgh, no way to decline (FIXME?) */
1588 value
= ssh
->pktin
.data
[ssh
->pktin
.savedpos
] != 0;
1589 ssh
->pktin
.savedpos
++;
1592 static void ssh2_pkt_getstring(Ssh ssh
, char **p
, int *length
)
1596 if (ssh
->pktin
.length
- ssh
->pktin
.savedpos
< 4)
1598 *length
= GET_32BIT(ssh
->pktin
.data
+ ssh
->pktin
.savedpos
);
1599 ssh
->pktin
.savedpos
+= 4;
1600 if (ssh
->pktin
.length
- ssh
->pktin
.savedpos
< *length
)
1602 *p
= ssh
->pktin
.data
+ ssh
->pktin
.savedpos
;
1603 ssh
->pktin
.savedpos
+= *length
;
1605 static Bignum
ssh2_pkt_getmp(Ssh ssh
)
1611 ssh2_pkt_getstring(ssh
, &p
, &length
);
1615 bombout(("internal error: Can't handle negative mpints"));
1618 b
= bignum_from_bytes(p
, length
);
1623 * Helper function to add an SSH2 signature blob to a packet.
1624 * Expects to be shown the public key blob as well as the signature
1625 * blob. Normally works just like ssh2_pkt_addstring, but will
1626 * fiddle with the signature packet if necessary for
1627 * BUG_SSH2_RSA_PADDING.
1629 static void ssh2_add_sigblob(Ssh ssh
, void *pkblob_v
, int pkblob_len
,
1630 void *sigblob_v
, int sigblob_len
)
1632 unsigned char *pkblob
= (unsigned char *)pkblob_v
;
1633 unsigned char *sigblob
= (unsigned char *)sigblob_v
;
1635 /* dmemdump(pkblob, pkblob_len); */
1636 /* dmemdump(sigblob, sigblob_len); */
1639 * See if this is in fact an ssh-rsa signature and a buggy
1640 * server; otherwise we can just do this the easy way.
1642 if ((ssh
->remote_bugs
& BUG_SSH2_RSA_PADDING
) &&
1643 (GET_32BIT(pkblob
) == 7 && !memcmp(pkblob
+4, "ssh-rsa", 7))) {
1644 int pos
, len
, siglen
;
1647 * Find the byte length of the modulus.
1650 pos
= 4+7; /* skip over "ssh-rsa" */
1651 pos
+= 4 + GET_32BIT(pkblob
+pos
); /* skip over exponent */
1652 len
= GET_32BIT(pkblob
+pos
); /* find length of modulus */
1653 pos
+= 4; /* find modulus itself */
1654 while (len
> 0 && pkblob
[pos
] == 0)
1656 /* debug(("modulus length is %d\n", len)); */
1659 * Now find the signature integer.
1661 pos
= 4+7; /* skip over "ssh-rsa" */
1662 siglen
= GET_32BIT(sigblob
+pos
);
1663 /* debug(("signature length is %d\n", siglen)); */
1665 if (len
!= siglen
) {
1666 unsigned char newlen
[4];
1667 ssh2_pkt_addstring_start(ssh
);
1668 ssh2_pkt_addstring_data(ssh
, sigblob
, pos
);
1669 /* dmemdump(sigblob, pos); */
1670 pos
+= 4; /* point to start of actual sig */
1671 PUT_32BIT(newlen
, len
);
1672 ssh2_pkt_addstring_data(ssh
, newlen
, 4);
1673 /* dmemdump(newlen, 4); */
1675 while (len
-- > siglen
) {
1676 ssh2_pkt_addstring_data(ssh
, newlen
, 1);
1677 /* dmemdump(newlen, 1); */
1679 ssh2_pkt_addstring_data(ssh
, sigblob
+pos
, siglen
);
1680 /* dmemdump(sigblob+pos, siglen); */
1684 /* Otherwise fall through and do it the easy way. */
1687 ssh2_pkt_addstring_start(ssh
);
1688 ssh2_pkt_addstring_data(ssh
, sigblob
, sigblob_len
);
1692 * Examine the remote side's version string and compare it against
1693 * a list of known buggy implementations.
1695 static void ssh_detect_bugs(Ssh ssh
, char *vstring
)
1697 char *imp
; /* pointer to implementation part */
1699 imp
+= strcspn(imp
, "-");
1701 imp
+= strcspn(imp
, "-");
1704 ssh
->remote_bugs
= 0;
1706 if (cfg
.sshbug_ignore1
== BUG_ON
||
1707 (cfg
.sshbug_ignore1
== BUG_AUTO
&&
1708 (!strcmp(imp
, "1.2.18") || !strcmp(imp
, "1.2.19") ||
1709 !strcmp(imp
, "1.2.20") || !strcmp(imp
, "1.2.21") ||
1710 !strcmp(imp
, "1.2.22") || !strcmp(imp
, "Cisco-1.25")))) {
1712 * These versions don't support SSH1_MSG_IGNORE, so we have
1713 * to use a different defence against password length
1716 ssh
->remote_bugs
|= BUG_CHOKES_ON_SSH1_IGNORE
;
1717 logevent("We believe remote version has SSH1 ignore bug");
1720 if (cfg
.sshbug_plainpw1
== BUG_ON
||
1721 (cfg
.sshbug_plainpw1
== BUG_AUTO
&&
1722 (!strcmp(imp
, "Cisco-1.25")))) {
1724 * These versions need a plain password sent; they can't
1725 * handle having a null and a random length of data after
1728 ssh
->remote_bugs
|= BUG_NEEDS_SSH1_PLAIN_PASSWORD
;
1729 logevent("We believe remote version needs a plain SSH1 password");
1732 if (cfg
.sshbug_rsa1
== BUG_ON
||
1733 (cfg
.sshbug_rsa1
== BUG_AUTO
&&
1734 (!strcmp(imp
, "Cisco-1.25")))) {
1736 * These versions apparently have no clue whatever about
1737 * RSA authentication and will panic and die if they see
1738 * an AUTH_RSA message.
1740 ssh
->remote_bugs
|= BUG_CHOKES_ON_RSA
;
1741 logevent("We believe remote version can't handle RSA authentication");
1744 if (cfg
.sshbug_hmac2
== BUG_ON
||
1745 (cfg
.sshbug_hmac2
== BUG_AUTO
&&
1746 (!strncmp(imp
, "2.1.0", 5) || !strncmp(imp
, "2.0.", 4) ||
1747 !strncmp(imp
, "2.2.0", 5) || !strncmp(imp
, "2.3.0", 5) ||
1748 !strncmp(imp
, "2.1 ", 4)))) {
1750 * These versions have the HMAC bug.
1752 ssh
->remote_bugs
|= BUG_SSH2_HMAC
;
1753 logevent("We believe remote version has SSH2 HMAC bug");
1756 if (cfg
.sshbug_derivekey2
== BUG_ON
||
1757 (cfg
.sshbug_derivekey2
== BUG_AUTO
&&
1758 (!strncmp(imp
, "2.0.", 4)))) {
1760 * These versions have the key-derivation bug (failing to
1761 * include the literal shared secret in the hashes that
1762 * generate the keys).
1764 ssh
->remote_bugs
|= BUG_SSH2_DERIVEKEY
;
1765 logevent("We believe remote version has SSH2 key-derivation bug");
1768 if (cfg
.sshbug_rsapad2
== BUG_ON
||
1769 (cfg
.sshbug_rsapad2
== BUG_AUTO
&&
1770 ((!strncmp(imp
, "OpenSSH_2.", 10) && imp
[10]>='5' && imp
[10]<='9') ||
1771 (!strncmp(imp
, "OpenSSH_3.", 10) && imp
[10]>='0' && imp
[10]<='2')))){
1773 * These versions have the SSH2 RSA padding bug.
1775 ssh
->remote_bugs
|= BUG_SSH2_RSA_PADDING
;
1776 logevent("We believe remote version has SSH2 RSA padding bug");
1779 if (cfg
.sshbug_dhgex2
== BUG_ON
) {
1781 * These versions have the SSH2 DH GEX bug.
1783 ssh
->remote_bugs
|= BUG_SSH2_DH_GEX
;
1784 logevent("We believe remote version has SSH2 DH group exchange bug");
1788 static int do_ssh_init(Ssh ssh
, unsigned char c
)
1790 struct do_ssh_init_state
{
1798 crState(do_ssh_init_state
);
1800 crBegin(ssh
->do_ssh_init_crstate
);
1802 /* Search for the string "SSH-" in the input. */
1805 static const int transS
[] = { 1, 2, 2, 1 };
1806 static const int transH
[] = { 0, 0, 3, 0 };
1807 static const int transminus
[] = { 0, 0, 0, -1 };
1809 s
->i
= transS
[s
->i
];
1811 s
->i
= transH
[s
->i
];
1813 s
->i
= transminus
[s
->i
];
1818 crReturn(1); /* get another character */
1822 s
->vstring
= smalloc(s
->vstrsize
);
1823 strcpy(s
->vstring
, "SSH-");
1827 crReturn(1); /* get another char */
1828 if (s
->vslen
>= s
->vstrsize
- 1) {
1830 s
->vstring
= srealloc(s
->vstring
, s
->vstrsize
);
1832 s
->vstring
[s
->vslen
++] = c
;
1835 s
->version
[s
->i
] = '\0';
1837 } else if (s
->i
< sizeof(s
->version
) - 1)
1838 s
->version
[s
->i
++] = c
;
1839 } else if (c
== '\n')
1843 ssh
->agentfwd_enabled
= FALSE
;
1844 ssh
->rdpkt2_state
.incoming_sequence
= 0;
1846 s
->vstring
[s
->vslen
] = 0;
1847 s
->vstring
[strcspn(s
->vstring
, "\r\n")] = '\0';/* remove EOL chars */
1850 vlog
= smalloc(20 + s
->vslen
);
1851 sprintf(vlog
, "Server version: %s", s
->vstring
);
1855 ssh_detect_bugs(ssh
, s
->vstring
);
1858 * Decide which SSH protocol version to support.
1861 /* Anything strictly below "2.0" means protocol 1 is supported. */
1862 s
->proto1
= ssh_versioncmp(s
->version
, "2.0") < 0;
1863 /* Anything greater or equal to "1.99" means protocol 2 is supported. */
1864 s
->proto2
= ssh_versioncmp(s
->version
, "1.99") >= 0;
1866 if (cfg
.sshprot
== 0 && !s
->proto1
) {
1867 bombout(("SSH protocol version 1 required by user but not provided by server"));
1870 if (cfg
.sshprot
== 3 && !s
->proto2
) {
1871 bombout(("SSH protocol version 2 required by user but not provided by server"));
1875 if (s
->proto2
&& (cfg
.sshprot
>= 2 || !s
->proto1
)) {
1879 char verstring
[80], vlog
[100];
1880 sprintf(verstring
, "SSH-2.0-%s", sshver
);
1881 SHA_Init(&ssh
->exhashbase
);
1883 * Hash our version string and their version string.
1885 sha_string(&ssh
->exhashbase
, verstring
, strlen(verstring
));
1886 sha_string(&ssh
->exhashbase
, s
->vstring
, strcspn(s
->vstring
, "\r\n"));
1887 sprintf(vlog
, "We claim version: %s", verstring
);
1889 strcat(verstring
, "\n");
1890 logevent("Using SSH protocol version 2");
1891 sk_write(ssh
->s
, verstring
, strlen(verstring
));
1892 ssh
->protocol
= ssh2_protocol
;
1894 ssh
->s_rdpkt
= ssh2_rdpkt
;
1899 char verstring
[80], vlog
[100];
1900 sprintf(verstring
, "SSH-%s-%s",
1901 (ssh_versioncmp(s
->version
, "1.5") <= 0 ? s
->version
: "1.5"),
1903 sprintf(vlog
, "We claim version: %s", verstring
);
1905 strcat(verstring
, "\n");
1907 logevent("Using SSH protocol version 1");
1908 sk_write(ssh
->s
, verstring
, strlen(verstring
));
1909 ssh
->protocol
= ssh1_protocol
;
1911 ssh
->s_rdpkt
= ssh1_rdpkt
;
1913 ssh
->state
= SSH_STATE_BEFORE_SIZE
;
1920 static void ssh_gotdata(Ssh ssh
, unsigned char *data
, int datalen
)
1922 crBegin(ssh
->ssh_gotdata_crstate
);
1925 * To begin with, feed the characters one by one to the
1926 * protocol initialisation / selection function do_ssh_init().
1927 * When that returns 0, we're done with the initial greeting
1928 * exchange and can move on to packet discipline.
1931 int ret
; /* need not be kept across crReturn */
1933 crReturnV
; /* more data please */
1934 ret
= do_ssh_init(ssh
, *data
);
1942 * We emerge from that loop when the initial negotiation is
1943 * over and we have selected an s_rdpkt function. Now pass
1944 * everything to s_rdpkt, and then pass the resulting packets
1945 * to the proper protocol handler.
1950 while (datalen
> 0) {
1951 if (ssh
->s_rdpkt(ssh
, &data
, &datalen
) == 0) {
1952 if (ssh
->state
== SSH_STATE_CLOSED
) {
1955 ssh
->protocol(ssh
, NULL
, 0, 1);
1956 if (ssh
->state
== SSH_STATE_CLOSED
) {
1966 static int ssh_closing(Plug plug
, char *error_msg
, int error_code
,
1969 Ssh ssh
= (Ssh
) plug
;
1970 ssh
->state
= SSH_STATE_CLOSED
;
1976 /* A socket error has occurred. */
1977 logevent(error_msg
);
1978 connection_fatal(error_msg
);
1980 /* Otherwise, the remote side closed the connection normally. */
1985 static int ssh_receive(Plug plug
, int urgent
, char *data
, int len
)
1987 Ssh ssh
= (Ssh
) plug
;
1988 ssh_gotdata(ssh
, data
, len
);
1989 if (ssh
->state
== SSH_STATE_CLOSED
) {
1999 static void ssh_sent(Plug plug
, int bufsize
)
2001 Ssh ssh
= (Ssh
) plug
;
2003 * If the send backlog on the SSH socket itself clears, we
2004 * should unthrottle the whole world if it was throttled.
2006 if (bufsize
< SSH_MAX_BACKLOG
)
2007 ssh_throttle_all(ssh
, 0, bufsize
);
2011 * Connect to specified host and port.
2012 * Returns an error message, or NULL on success.
2013 * Also places the canonical host name into `realhost'. It must be
2014 * freed by the caller.
2016 static char *connect_to_host(Ssh ssh
, char *host
, int port
,
2017 char **realhost
, int nodelay
)
2019 static const struct plug_function_table fn_table
= {
2029 ssh
->savedhost
= smalloc(1 + strlen(host
));
2030 if (!ssh
->savedhost
)
2031 fatalbox("Out of memory");
2032 strcpy(ssh
->savedhost
, host
);
2035 port
= 22; /* default ssh port */
2036 ssh
->savedport
= port
;
2043 sprintf(buf
, "Looking up host \"%.170s\"", host
);
2046 addr
= sk_namelookup(host
, realhost
);
2047 if ((err
= sk_addr_error(addr
)))
2054 char buf
[200], addrbuf
[100];
2055 sk_getaddr(addr
, addrbuf
, 100);
2056 sprintf(buf
, "Connecting to %.100s port %d", addrbuf
, port
);
2059 ssh
->fn
= &fn_table
;
2060 ssh
->s
= new_connection(addr
, *realhost
, port
, 0, 1, nodelay
, (Plug
) ssh
);
2061 if ((err
= sk_socket_error(ssh
->s
))) {
2070 * Throttle or unthrottle the SSH connection.
2072 static void ssh1_throttle(Ssh ssh
, int adjust
)
2074 int old_count
= ssh
->v1_throttle_count
;
2075 ssh
->v1_throttle_count
+= adjust
;
2076 assert(ssh
->v1_throttle_count
>= 0);
2077 if (ssh
->v1_throttle_count
&& !old_count
) {
2078 sk_set_frozen(ssh
->s
, 1);
2079 } else if (!ssh
->v1_throttle_count
&& old_count
) {
2080 sk_set_frozen(ssh
->s
, 0);
2085 * Throttle or unthrottle _all_ local data streams (for when sends
2086 * on the SSH connection itself back up).
2088 static void ssh_throttle_all(Ssh ssh
, int enable
, int bufsize
)
2091 struct ssh_channel
*c
;
2093 if (enable
== ssh
->throttled_all
)
2095 ssh
->throttled_all
= enable
;
2096 ssh
->overall_bufsize
= bufsize
;
2099 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
2101 case CHAN_MAINSESSION
:
2103 * This is treated separately, outside the switch.
2107 x11_override_throttle(c
->u
.x11
.s
, enable
);
2110 /* Agent channels require no buffer management. */
2113 pfd_override_throttle(c
->u
.x11
.s
, enable
);
2120 * Username and password input, abstracted off into routines
2121 * reusable in several places - even between SSH1 and SSH2.
2124 /* Set up a username or password input loop on a given buffer. */
2125 void setup_userpass_input(Ssh ssh
, char *buffer
, int buflen
, int echo
)
2127 ssh
->userpass_input_buffer
= buffer
;
2128 ssh
->userpass_input_buflen
= buflen
;
2129 ssh
->userpass_input_bufpos
= 0;
2130 ssh
->userpass_input_echo
= echo
;
2134 * Process some terminal data in the course of username/password
2135 * input. Returns >0 for success (line of input returned in
2136 * buffer), <0 for failure (user hit ^C/^D, bomb out and exit), 0
2137 * for inconclusive (keep waiting for more input please).
2139 int process_userpass_input(Ssh ssh
, unsigned char *in
, int inlen
)
2144 switch (c
= *in
++) {
2147 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
] = 0;
2148 ssh
->userpass_input_buffer
[ssh
->userpass_input_buflen
-1] = 0;
2153 if (ssh
->userpass_input_bufpos
> 0) {
2154 if (ssh
->userpass_input_echo
)
2155 c_write_str(ssh
, "\b \b");
2156 ssh
->userpass_input_bufpos
--;
2161 while (ssh
->userpass_input_bufpos
> 0) {
2162 if (ssh
->userpass_input_echo
)
2163 c_write_str(ssh
, "\b \b");
2164 ssh
->userpass_input_bufpos
--;
2172 if (((c
>= ' ' && c
<= '~') ||
2173 ((unsigned char) c
>= 160))
2174 && ssh
->userpass_input_bufpos
< ssh
->userpass_input_buflen
-1) {
2175 ssh
->userpass_input_buffer
[ssh
->userpass_input_bufpos
++] = c
;
2176 if (ssh
->userpass_input_echo
)
2177 c_write(ssh
, &c
, 1);
2186 * Handle the key exchange and user authentication phases.
2188 static int do_ssh1_login(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
2191 unsigned char cookie
[8];
2192 struct RSAKey servkey
, hostkey
;
2193 struct MD5Context md5c
;
2194 struct do_ssh1_login_state
{
2196 unsigned char *rsabuf
, *keystr1
, *keystr2
;
2197 unsigned long supported_ciphers_mask
, supported_auths_mask
;
2198 int tried_publickey
, tried_agent
;
2199 int tis_auth_refused
, ccard_auth_refused
;
2200 unsigned char session_id
[16];
2203 void *publickey_blob
;
2204 int publickey_bloblen
;
2210 unsigned char request
[5], *response
, *p
;
2219 crState(do_ssh1_login_state
);
2221 crBegin(ssh
->do_ssh1_login_crstate
);
2226 if (ssh
->pktin
.type
!= SSH1_SMSG_PUBLIC_KEY
) {
2227 bombout(("Public key packet not received"));
2231 logevent("Received public keys");
2233 memcpy(cookie
, ssh
->pktin
.body
, 8);
2235 i
= makekey(ssh
->pktin
.body
+ 8, &servkey
, &s
->keystr1
, 0);
2236 j
= makekey(ssh
->pktin
.body
+ 8 + i
, &hostkey
, &s
->keystr2
, 0);
2239 * Log the host key fingerprint.
2243 logevent("Host key fingerprint is:");
2244 strcpy(logmsg
, " ");
2245 hostkey
.comment
= NULL
;
2246 rsa_fingerprint(logmsg
+ strlen(logmsg
),
2247 sizeof(logmsg
) - strlen(logmsg
), &hostkey
);
2251 ssh
->v1_remote_protoflags
= GET_32BIT(ssh
->pktin
.body
+ 8 + i
+ j
);
2252 s
->supported_ciphers_mask
= GET_32BIT(ssh
->pktin
.body
+ 12 + i
+ j
);
2253 s
->supported_auths_mask
= GET_32BIT(ssh
->pktin
.body
+ 16 + i
+ j
);
2255 ssh
->v1_local_protoflags
=
2256 ssh
->v1_remote_protoflags
& SSH1_PROTOFLAGS_SUPPORTED
;
2257 ssh
->v1_local_protoflags
|= SSH1_PROTOFLAG_SCREEN_NUMBER
;
2260 MD5Update(&md5c
, s
->keystr2
, hostkey
.bytes
);
2261 MD5Update(&md5c
, s
->keystr1
, servkey
.bytes
);
2262 MD5Update(&md5c
, ssh
->pktin
.body
, 8);
2263 MD5Final(s
->session_id
, &md5c
);
2265 for (i
= 0; i
< 32; i
++)
2266 ssh
->session_key
[i
] = random_byte();
2268 s
->len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
2270 s
->rsabuf
= smalloc(s
->len
);
2272 fatalbox("Out of memory");
2275 * Verify the host key.
2279 * First format the key into a string.
2281 int len
= rsastr_len(&hostkey
);
2282 char fingerprint
[100];
2283 char *keystr
= smalloc(len
);
2285 fatalbox("Out of memory");
2286 rsastr_fmt(keystr
, &hostkey
);
2287 rsa_fingerprint(fingerprint
, sizeof(fingerprint
), &hostkey
);
2288 verify_ssh_host_key(ssh
->savedhost
, ssh
->savedport
, "rsa", keystr
,
2293 for (i
= 0; i
< 32; i
++) {
2294 s
->rsabuf
[i
] = ssh
->session_key
[i
];
2296 s
->rsabuf
[i
] ^= s
->session_id
[i
];
2299 if (hostkey
.bytes
> servkey
.bytes
) {
2300 rsaencrypt(s
->rsabuf
, 32, &servkey
);
2301 rsaencrypt(s
->rsabuf
, servkey
.bytes
, &hostkey
);
2303 rsaencrypt(s
->rsabuf
, 32, &hostkey
);
2304 rsaencrypt(s
->rsabuf
, hostkey
.bytes
, &servkey
);
2307 logevent("Encrypted session key");
2310 int cipher_chosen
= 0, warn
= 0;
2311 char *cipher_string
= NULL
;
2313 for (i
= 0; !cipher_chosen
&& i
< CIPHER_MAX
; i
++) {
2314 int next_cipher
= cfg
.ssh_cipherlist
[i
];
2315 if (next_cipher
== CIPHER_WARN
) {
2316 /* If/when we choose a cipher, warn about it */
2318 } else if (next_cipher
== CIPHER_AES
) {
2319 /* XXX Probably don't need to mention this. */
2320 logevent("AES not supported in SSH1, skipping");
2322 switch (next_cipher
) {
2323 case CIPHER_3DES
: s
->cipher_type
= SSH_CIPHER_3DES
;
2324 cipher_string
= "3DES"; break;
2325 case CIPHER_BLOWFISH
: s
->cipher_type
= SSH_CIPHER_BLOWFISH
;
2326 cipher_string
= "Blowfish"; break;
2327 case CIPHER_DES
: s
->cipher_type
= SSH_CIPHER_DES
;
2328 cipher_string
= "single-DES"; break;
2330 if (s
->supported_ciphers_mask
& (1 << s
->cipher_type
))
2334 if (!cipher_chosen
) {
2335 if ((s
->supported_ciphers_mask
& (1 << SSH_CIPHER_3DES
)) == 0)
2336 bombout(("Server violates SSH 1 protocol by not "
2337 "supporting 3DES encryption"));
2339 /* shouldn't happen */
2340 bombout(("No supported ciphers found"));
2344 /* Warn about chosen cipher if necessary. */
2346 askcipher(cipher_string
, 0);
2349 switch (s
->cipher_type
) {
2350 case SSH_CIPHER_3DES
:
2351 logevent("Using 3DES encryption");
2353 case SSH_CIPHER_DES
:
2354 logevent("Using single-DES encryption");
2356 case SSH_CIPHER_BLOWFISH
:
2357 logevent("Using Blowfish encryption");
2361 send_packet(ssh
, SSH1_CMSG_SESSION_KEY
,
2362 PKT_CHAR
, s
->cipher_type
,
2363 PKT_DATA
, cookie
, 8,
2364 PKT_CHAR
, (s
->len
* 8) >> 8, PKT_CHAR
, (s
->len
* 8) & 0xFF,
2365 PKT_DATA
, s
->rsabuf
, s
->len
,
2366 PKT_INT
, ssh
->v1_local_protoflags
, PKT_END
);
2368 logevent("Trying to enable encryption...");
2372 ssh
->cipher
= (s
->cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish_ssh1
:
2373 s
->cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
2375 ssh
->v1_cipher_ctx
= ssh
->cipher
->make_context();
2376 ssh
->cipher
->sesskey(ssh
->v1_cipher_ctx
, ssh
->session_key
);
2379 sprintf(buf
, "Initialised %.200s encryption", ssh
->cipher
->text_name
);
2383 ssh
->crcda_ctx
= crcda_make_context();
2384 logevent("Installing CRC compensation attack detector");
2388 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
) {
2389 bombout(("Encryption not successfully enabled"));
2393 logevent("Successfully started encryption");
2397 if ((flags
& FLAG_INTERACTIVE
) && !*cfg
.username
) {
2398 if (ssh_get_line
&& !ssh_getline_pw_only
) {
2399 if (!ssh_get_line("login as: ",
2400 s
->username
, sizeof(s
->username
), FALSE
)) {
2402 * get_line failed to get a username.
2405 logevent("No username provided. Abandoning session.");
2406 ssh
->state
= SSH_STATE_CLOSED
;
2410 int ret
; /* need not be kept over crReturn */
2411 c_write_str(ssh
, "login as: ");
2414 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
2416 crWaitUntil(!ispkt
);
2417 ret
= process_userpass_input(ssh
, in
, inlen
);
2421 c_write_str(ssh
, "\r\n");
2424 strncpy(s
->username
, cfg
.username
, sizeof(s
->username
));
2425 s
->username
[sizeof(s
->username
)-1] = '\0';
2428 send_packet(ssh
, SSH1_CMSG_USER
, PKT_STR
, s
->username
, PKT_END
);
2430 char userlog
[22 + sizeof(s
->username
)];
2431 sprintf(userlog
, "Sent username \"%s\"", s
->username
);
2433 if (flags
& FLAG_INTERACTIVE
&&
2434 (!((flags
& FLAG_STDERR
) && (flags
& FLAG_VERBOSE
)))) {
2435 strcat(userlog
, "\r\n");
2436 c_write_str(ssh
, userlog
);
2443 if ((ssh
->remote_bugs
& BUG_CHOKES_ON_RSA
)) {
2444 /* We must not attempt PK auth. Pretend we've already tried it. */
2445 s
->tried_publickey
= s
->tried_agent
= 1;
2447 s
->tried_publickey
= s
->tried_agent
= 0;
2449 s
->tis_auth_refused
= s
->ccard_auth_refused
= 0;
2450 /* Load the public half of cfg.keyfile so we notice if it's in Pageant */
2452 if (!rsakey_pubblob(cfg
.keyfile
,
2453 &s
->publickey_blob
, &s
->publickey_bloblen
))
2454 s
->publickey_blob
= NULL
;
2456 s
->publickey_blob
= NULL
;
2458 while (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
2459 s
->pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
2461 if (agent_exists() && !s
->tried_agent
) {
2463 * Attempt RSA authentication using Pageant.
2469 logevent("Pageant is running. Requesting keys.");
2471 /* Request the keys held by the agent. */
2472 PUT_32BIT(s
->request
, 1);
2473 s
->request
[4] = SSH1_AGENTC_REQUEST_RSA_IDENTITIES
;
2474 agent_query(s
->request
, 5, &r
, &s
->responselen
);
2475 s
->response
= (unsigned char *) r
;
2476 if (s
->response
&& s
->responselen
>= 5 &&
2477 s
->response
[4] == SSH1_AGENT_RSA_IDENTITIES_ANSWER
) {
2478 s
->p
= s
->response
+ 5;
2479 s
->nkeys
= GET_32BIT(s
->p
);
2483 sprintf(buf
, "Pageant has %d SSH1 keys", s
->nkeys
);
2486 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
2489 sprintf(buf
, "Trying Pageant key #%d", s
->keyi
);
2492 if (s
->publickey_blob
&&
2493 !memcmp(s
->p
, s
->publickey_blob
,
2494 s
->publickey_bloblen
)) {
2495 logevent("This key matches configured key file");
2496 s
->tried_publickey
= 1;
2499 s
->p
+= ssh1_read_bignum(s
->p
, &s
->key
.exponent
);
2500 s
->p
+= ssh1_read_bignum(s
->p
, &s
->key
.modulus
);
2501 s
->commentlen
= GET_32BIT(s
->p
);
2504 s
->p
+= s
->commentlen
;
2505 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
2506 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
2508 if (ssh
->pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
2509 logevent("Key refused");
2512 logevent("Received RSA challenge");
2513 ssh1_read_bignum(ssh
->pktin
.body
, &s
->challenge
);
2515 char *agentreq
, *q
, *ret
;
2518 len
= 1 + 4; /* message type, bit count */
2519 len
+= ssh1_bignum_length(s
->key
.exponent
);
2520 len
+= ssh1_bignum_length(s
->key
.modulus
);
2521 len
+= ssh1_bignum_length(s
->challenge
);
2522 len
+= 16; /* session id */
2523 len
+= 4; /* response format */
2524 agentreq
= smalloc(4 + len
);
2525 PUT_32BIT(agentreq
, len
);
2527 *q
++ = SSH1_AGENTC_RSA_CHALLENGE
;
2528 PUT_32BIT(q
, bignum_bitcount(s
->key
.modulus
));
2530 q
+= ssh1_write_bignum(q
, s
->key
.exponent
);
2531 q
+= ssh1_write_bignum(q
, s
->key
.modulus
);
2532 q
+= ssh1_write_bignum(q
, s
->challenge
);
2533 memcpy(q
, s
->session_id
, 16);
2535 PUT_32BIT(q
, 1); /* response format */
2536 agent_query(agentreq
, len
+ 4, &vret
, &retlen
);
2540 if (ret
[4] == SSH1_AGENT_RSA_RESPONSE
) {
2541 logevent("Sending Pageant's response");
2542 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
2543 PKT_DATA
, ret
+ 5, 16,
2547 if (ssh
->pktin
.type
== SSH1_SMSG_SUCCESS
) {
2549 ("Pageant's response accepted");
2550 if (flags
& FLAG_VERBOSE
) {
2551 c_write_str(ssh
, "Authenticated using"
2553 c_write(ssh
, s
->commentp
,
2555 c_write_str(ssh
, "\" from agent\r\n");
2560 ("Pageant's response not accepted");
2563 ("Pageant failed to answer challenge");
2567 logevent("No reply received from Pageant");
2570 freebn(s
->key
.exponent
);
2571 freebn(s
->key
.modulus
);
2572 freebn(s
->challenge
);
2580 if (*cfg
.keyfile
&& !s
->tried_publickey
)
2581 s
->pwpkt_type
= SSH1_CMSG_AUTH_RSA
;
2583 if (cfg
.try_tis_auth
&&
2584 (s
->supported_auths_mask
& (1 << SSH1_AUTH_TIS
)) &&
2585 !s
->tis_auth_refused
) {
2586 s
->pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
2587 logevent("Requested TIS authentication");
2588 send_packet(ssh
, SSH1_CMSG_AUTH_TIS
, PKT_END
);
2590 if (ssh
->pktin
.type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
2591 logevent("TIS authentication declined");
2592 if (flags
& FLAG_INTERACTIVE
)
2593 c_write_str(ssh
, "TIS authentication refused.\r\n");
2594 s
->tis_auth_refused
= 1;
2597 int challengelen
= GET_32BIT(ssh
->pktin
.body
);
2598 logevent("Received TIS challenge");
2599 if (challengelen
> sizeof(s
->prompt
) - 1)
2600 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
2601 memcpy(s
->prompt
, ssh
->pktin
.body
+ 4, challengelen
);
2602 /* Prompt heuristic comes from OpenSSH */
2603 strncpy(s
->prompt
+ challengelen
,
2604 memchr(s
->prompt
, '\n', challengelen
) ?
2605 "": "\r\nResponse: ",
2606 (sizeof s
->prompt
) - challengelen
);
2607 s
->prompt
[(sizeof s
->prompt
) - 1] = '\0';
2610 if (cfg
.try_tis_auth
&&
2611 (s
->supported_auths_mask
& (1 << SSH1_AUTH_CCARD
)) &&
2612 !s
->ccard_auth_refused
) {
2613 s
->pwpkt_type
= SSH1_CMSG_AUTH_CCARD_RESPONSE
;
2614 logevent("Requested CryptoCard authentication");
2615 send_packet(ssh
, SSH1_CMSG_AUTH_CCARD
, PKT_END
);
2617 if (ssh
->pktin
.type
!= SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
2618 logevent("CryptoCard authentication declined");
2619 c_write_str(ssh
, "CryptoCard authentication refused.\r\n");
2620 s
->ccard_auth_refused
= 1;
2623 int challengelen
= GET_32BIT(ssh
->pktin
.body
);
2624 logevent("Received CryptoCard challenge");
2625 if (challengelen
> sizeof(s
->prompt
) - 1)
2626 challengelen
= sizeof(s
->prompt
) - 1;/* prevent overrun */
2627 memcpy(s
->prompt
, ssh
->pktin
.body
+ 4, challengelen
);
2628 strncpy(s
->prompt
+ challengelen
,
2629 memchr(s
->prompt
, '\n', challengelen
) ?
2630 "" : "\r\nResponse: ",
2631 sizeof(s
->prompt
) - challengelen
);
2632 s
->prompt
[sizeof(s
->prompt
) - 1] = '\0';
2635 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
2636 sprintf(s
->prompt
, "%.90s@%.90s's password: ",
2637 s
->username
, ssh
->savedhost
);
2639 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
2640 char *comment
= NULL
;
2643 if (flags
& FLAG_VERBOSE
)
2644 c_write_str(ssh
, "Trying public key authentication.\r\n");
2645 sprintf(msgbuf
, "Trying public key \"%.200s\"", cfg
.keyfile
);
2647 type
= key_type(cfg
.keyfile
);
2648 if (type
!= SSH_KEYTYPE_SSH1
) {
2649 sprintf(msgbuf
, "Key is of wrong type (%s)",
2650 key_type_to_str(type
));
2652 c_write_str(ssh
, msgbuf
);
2653 c_write_str(ssh
, "\r\n");
2654 s
->tried_publickey
= 1;
2657 if (!rsakey_encrypted(cfg
.keyfile
, &comment
)) {
2658 if (flags
& FLAG_VERBOSE
)
2659 c_write_str(ssh
, "No passphrase required.\r\n");
2662 sprintf(s
->prompt
, "Passphrase for key \"%.100s\": ", comment
);
2667 * Show password prompt, having first obtained it via a TIS
2668 * or CryptoCard exchange if we're doing TIS or CryptoCard
2672 if (!ssh_get_line(s
->prompt
, s
->password
,
2673 sizeof(s
->password
), TRUE
)) {
2675 * get_line failed to get a password (for example
2676 * because one was supplied on the command line
2677 * which has already failed to work). Terminate.
2679 send_packet(ssh
, SSH1_MSG_DISCONNECT
,
2680 PKT_STR
, "No more passwords available to try",
2682 logevent("Unable to authenticate");
2683 connection_fatal("Unable to authenticate");
2684 ssh
->state
= SSH_STATE_CLOSED
;
2688 /* Prompt may have come from server. We've munged it a bit, so
2689 * we know it to be zero-terminated at least once. */
2690 int ret
; /* need not be saved over crReturn */
2691 c_write_untrusted(ssh
, s
->prompt
, strlen(s
->prompt
));
2694 setup_userpass_input(ssh
, s
->password
, sizeof(s
->password
), 0);
2696 crWaitUntil(!ispkt
);
2697 ret
= process_userpass_input(ssh
, in
, inlen
);
2701 c_write_str(ssh
, "\r\n");
2705 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
2707 * Try public key authentication with the specified
2710 s
->tried_publickey
= 1;
2713 int ret
= loadrsakey(cfg
.keyfile
, &s
->key
, s
->password
);
2715 c_write_str(ssh
, "Couldn't load private key from ");
2716 c_write_str(ssh
, cfg
.keyfile
);
2717 c_write_str(ssh
, ".\r\n");
2718 continue; /* go and try password */
2721 c_write_str(ssh
, "Wrong passphrase.\r\n");
2722 s
->tried_publickey
= 0;
2723 continue; /* try again */
2728 * Send a public key attempt.
2730 send_packet(ssh
, SSH1_CMSG_AUTH_RSA
,
2731 PKT_BIGNUM
, s
->key
.modulus
, PKT_END
);
2734 if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
2735 c_write_str(ssh
, "Server refused our public key.\r\n");
2736 continue; /* go and try password */
2738 if (ssh
->pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
2739 bombout(("Bizarre response to offer of public key"));
2745 unsigned char buffer
[32];
2746 Bignum challenge
, response
;
2748 ssh1_read_bignum(ssh
->pktin
.body
, &challenge
);
2749 response
= rsadecrypt(challenge
, &s
->key
);
2750 freebn(s
->key
.private_exponent
);/* burn the evidence */
2752 for (i
= 0; i
< 32; i
++) {
2753 buffer
[i
] = bignum_byte(response
, 31 - i
);
2757 MD5Update(&md5c
, buffer
, 32);
2758 MD5Update(&md5c
, s
->session_id
, 16);
2759 MD5Final(buffer
, &md5c
);
2761 send_packet(ssh
, SSH1_CMSG_AUTH_RSA_RESPONSE
,
2762 PKT_DATA
, buffer
, 16, PKT_END
);
2769 if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
2770 if (flags
& FLAG_VERBOSE
)
2771 c_write_str(ssh
, "Failed to authenticate with"
2772 " our public key.\r\n");
2773 continue; /* go and try password */
2774 } else if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
) {
2775 bombout(("Bizarre response to RSA authentication response"));
2779 break; /* we're through! */
2781 if (s
->pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
2783 * Defence against traffic analysis: we send a
2784 * whole bunch of packets containing strings of
2785 * different lengths. One of these strings is the
2786 * password, in a SSH1_CMSG_AUTH_PASSWORD packet.
2787 * The others are all random data in
2788 * SSH1_MSG_IGNORE packets. This way a passive
2789 * listener can't tell which is the password, and
2790 * hence can't deduce the password length.
2792 * Anybody with a password length greater than 16
2793 * bytes is going to have enough entropy in their
2794 * password that a listener won't find it _that_
2795 * much help to know how long it is. So what we'll
2798 * - if password length < 16, we send 15 packets
2799 * containing string lengths 1 through 15
2801 * - otherwise, we let N be the nearest multiple
2802 * of 8 below the password length, and send 8
2803 * packets containing string lengths N through
2804 * N+7. This won't obscure the order of
2805 * magnitude of the password length, but it will
2806 * introduce a bit of extra uncertainty.
2808 * A few servers (the old 1.2.18 through 1.2.22)
2809 * can't deal with SSH1_MSG_IGNORE. For these
2810 * servers, we need an alternative defence. We make
2811 * use of the fact that the password is interpreted
2812 * as a C string: so we can append a NUL, then some
2815 * One server (a Cisco one) can deal with neither
2816 * SSH1_MSG_IGNORE _nor_ a padded password string.
2817 * For this server we are left with no defences
2818 * against password length sniffing.
2820 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
)) {
2822 * The server can deal with SSH1_MSG_IGNORE, so
2823 * we can use the primary defence.
2825 int bottom
, top
, pwlen
, i
;
2828 pwlen
= strlen(s
->password
);
2830 bottom
= 0; /* zero length passwords are OK! :-) */
2833 bottom
= pwlen
& ~7;
2837 assert(pwlen
>= bottom
&& pwlen
<= top
);
2839 randomstr
= smalloc(top
+ 1);
2841 for (i
= bottom
; i
<= top
; i
++) {
2843 defer_packet(ssh
, s
->pwpkt_type
,
2844 PKT_STR
, s
->password
, PKT_END
);
2846 for (j
= 0; j
< i
; j
++) {
2848 randomstr
[j
] = random_byte();
2849 } while (randomstr
[j
] == '\0');
2851 randomstr
[i
] = '\0';
2852 defer_packet(ssh
, SSH1_MSG_IGNORE
,
2853 PKT_STR
, randomstr
, PKT_END
);
2856 logevent("Sending password with camouflage packets");
2857 ssh_pkt_defersend(ssh
);
2859 else if (!(ssh
->remote_bugs
& BUG_NEEDS_SSH1_PLAIN_PASSWORD
)) {
2861 * The server can't deal with SSH1_MSG_IGNORE
2862 * but can deal with padded passwords, so we
2863 * can use the secondary defence.
2869 len
= strlen(s
->password
);
2870 if (len
< sizeof(string
)) {
2872 strcpy(string
, s
->password
);
2873 len
++; /* cover the zero byte */
2874 while (len
< sizeof(string
)) {
2875 string
[len
++] = (char) random_byte();
2880 logevent("Sending length-padded password");
2881 send_packet(ssh
, s
->pwpkt_type
, PKT_INT
, len
,
2882 PKT_DATA
, ss
, len
, PKT_END
);
2885 * The server has _both_
2886 * BUG_CHOKES_ON_SSH1_IGNORE and
2887 * BUG_NEEDS_SSH1_PLAIN_PASSWORD. There is
2888 * therefore nothing we can do.
2891 len
= strlen(s
->password
);
2892 logevent("Sending unpadded password");
2893 send_packet(ssh
, s
->pwpkt_type
, PKT_INT
, len
,
2894 PKT_DATA
, s
->password
, len
, PKT_END
);
2897 send_packet(ssh
, s
->pwpkt_type
, PKT_STR
, s
->password
, PKT_END
);
2900 logevent("Sent password");
2901 memset(s
->password
, 0, strlen(s
->password
));
2903 if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
2904 if (flags
& FLAG_VERBOSE
)
2905 c_write_str(ssh
, "Access denied\r\n");
2906 logevent("Authentication refused");
2907 } else if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
) {
2908 bombout(("Strange packet received, type %d", ssh
->pktin
.type
));
2913 logevent("Authentication successful");
2918 void sshfwd_close(struct ssh_channel
*c
)
2922 if (c
&& !c
->closes
) {
2924 * If the channel's remoteid is -1, we have sent
2925 * CHANNEL_OPEN for this channel, but it hasn't even been
2926 * acknowledged by the server. So we must set a close flag
2927 * on it now, and then when the server acks the channel
2928 * open, we can close it then.
2930 if (((int)c
->remoteid
) != -1) {
2931 if (ssh
->version
== 1) {
2932 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
, PKT_INT
, c
->remoteid
,
2935 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_CLOSE
);
2936 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
2940 c
->closes
= 1; /* sent MSG_CLOSE */
2941 if (c
->type
== CHAN_X11
) {
2943 logevent("Forwarded X11 connection terminated");
2944 } else if (c
->type
== CHAN_SOCKDATA
||
2945 c
->type
== CHAN_SOCKDATA_DORMANT
) {
2947 logevent("Forwarded port closed");
2952 int sshfwd_write(struct ssh_channel
*c
, char *buf
, int len
)
2956 if (ssh
->version
== 1) {
2957 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
2958 PKT_INT
, c
->remoteid
,
2959 PKT_INT
, len
, PKT_DATA
, buf
, len
, PKT_END
);
2961 * In SSH1 we can return 0 here - implying that forwarded
2962 * connections are never individually throttled - because
2963 * the only circumstance that can cause throttling will be
2964 * the whole SSH connection backing up, in which case
2965 * _everything_ will be throttled as a whole.
2969 ssh2_add_channel_data(c
, buf
, len
);
2970 return ssh2_try_send(c
);
2974 void sshfwd_unthrottle(struct ssh_channel
*c
, int bufsize
)
2978 if (ssh
->version
== 1) {
2979 if (c
->v
.v1
.throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
2980 c
->v
.v1
.throttling
= 0;
2981 ssh1_throttle(ssh
, -1);
2984 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
2988 static void ssh1_protocol(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
2990 crBegin(ssh
->ssh1_protocol_crstate
);
2994 while (!do_ssh1_login(ssh
, in
, inlen
, ispkt
)) {
2997 if (ssh
->state
== SSH_STATE_CLOSED
)
3000 if (cfg
.agentfwd
&& agent_exists()) {
3001 logevent("Requesting agent forwarding");
3002 send_packet(ssh
, SSH1_CMSG_AGENT_REQUEST_FORWARDING
, PKT_END
);
3006 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3007 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3008 bombout(("Protocol confusion"));
3010 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3011 logevent("Agent forwarding refused");
3013 logevent("Agent forwarding enabled");
3014 ssh
->agentfwd_enabled
= TRUE
;
3018 if (cfg
.x11_forward
) {
3019 char proto
[20], data
[64];
3020 logevent("Requesting X11 forwarding");
3021 x11_invent_auth(proto
, sizeof(proto
), data
, sizeof(data
));
3022 if (ssh
->v1_local_protoflags
& SSH1_PROTOFLAG_SCREEN_NUMBER
) {
3023 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
3024 PKT_STR
, proto
, PKT_STR
, data
,
3025 PKT_INT
, 0, PKT_END
);
3027 send_packet(ssh
, SSH1_CMSG_X11_REQUEST_FORWARDING
,
3028 PKT_STR
, proto
, PKT_STR
, data
, PKT_END
);
3033 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3034 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3035 bombout(("Protocol confusion"));
3037 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3038 logevent("X11 forwarding refused");
3040 logevent("X11 forwarding enabled");
3041 ssh
->X11_fwd_enabled
= TRUE
;
3048 int sport
,dport
,sserv
,dserv
;
3049 char sports
[256], dports
[256], host
[256];
3053 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh1
);
3054 /* Add port forwardings. */
3055 ssh
->portfwd_strptr
= cfg
.portfwd
;
3056 while (*ssh
->portfwd_strptr
) {
3057 type
= *ssh
->portfwd_strptr
++;
3059 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= '\t')
3060 sports
[n
++] = *ssh
->portfwd_strptr
++;
3062 if (*ssh
->portfwd_strptr
== '\t')
3063 ssh
->portfwd_strptr
++;
3065 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= ':')
3066 host
[n
++] = *ssh
->portfwd_strptr
++;
3068 if (*ssh
->portfwd_strptr
== ':')
3069 ssh
->portfwd_strptr
++;
3071 while (*ssh
->portfwd_strptr
)
3072 dports
[n
++] = *ssh
->portfwd_strptr
++;
3074 ssh
->portfwd_strptr
++;
3075 dport
= atoi(dports
);
3079 se
= getservbyname(dports
, NULL
);
3081 dport
= ntohs(se
->s_port
);
3084 "Service lookup failed for destination port \"%s\"",
3089 sport
= atoi(sports
);
3093 se
= getservbyname(sports
, NULL
);
3095 sport
= ntohs(se
->s_port
);
3098 "Service lookup failed for source port \"%s\"",
3103 if (sport
&& dport
) {
3105 pfd_addforward(host
, dport
, sport
);
3106 sprintf(buf
, "Local port %.*s%.*s%d%.*s forwarding to"
3107 " %s:%.*s%.*s%d%.*s",
3108 sserv ?
strlen(sports
) : 0, sports
,
3109 sserv
, "(", sport
, sserv
, ")",
3111 dserv ?
strlen(dports
) : 0, dports
,
3112 dserv
, "(", dport
, dserv
, ")");
3115 struct ssh_rportfwd
*pf
;
3116 pf
= smalloc(sizeof(*pf
));
3117 strcpy(pf
->dhost
, host
);
3119 if (add234(ssh
->rportfwds
, pf
) != pf
) {
3121 "Duplicate remote port forwarding to %s:%d",
3126 sprintf(buf
, "Requesting remote port %.*s%.*s%d%.*s"
3127 " forward to %s:%.*s%.*s%d%.*s",
3128 sserv ?
strlen(sports
) : 0, sports
,
3129 sserv
, "(", sport
, sserv
, ")",
3131 dserv ?
strlen(dports
) : 0, dports
,
3132 dserv
, "(", dport
, dserv
, ")");
3134 send_packet(ssh
, SSH1_CMSG_PORT_FORWARD_REQUEST
,
3142 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3143 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3144 bombout(("Protocol confusion"));
3146 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3147 c_write_str(ssh
, "Server refused port"
3150 logevent("Remote port forwarding enabled");
3158 send_packet(ssh
, SSH1_CMSG_REQUEST_PTY
,
3159 PKT_STR
, cfg
.termtype
,
3160 PKT_INT
, ssh
->term_height
,
3161 PKT_INT
, ssh
->term_width
,
3162 PKT_INT
, 0, PKT_INT
, 0, PKT_CHAR
, 0, PKT_END
);
3163 ssh
->state
= SSH_STATE_INTERMED
;
3167 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3168 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3169 bombout(("Protocol confusion"));
3171 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3172 c_write_str(ssh
, "Server refused to allocate pty\r\n");
3173 ssh
->editing
= ssh
->echoing
= 1;
3175 logevent("Allocated pty");
3177 ssh
->editing
= ssh
->echoing
= 1;
3180 if (cfg
.compression
) {
3181 send_packet(ssh
, SSH1_CMSG_REQUEST_COMPRESSION
, PKT_INT
, 6, PKT_END
);
3185 if (ssh
->pktin
.type
!= SSH1_SMSG_SUCCESS
3186 && ssh
->pktin
.type
!= SSH1_SMSG_FAILURE
) {
3187 bombout(("Protocol confusion"));
3189 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3190 c_write_str(ssh
, "Server refused to compress\r\n");
3192 logevent("Started compression");
3193 ssh
->v1_compressing
= TRUE
;
3194 zlib_compress_init();
3195 zlib_decompress_init();
3199 * Start the shell or command.
3201 * Special case: if the first-choice command is an SSH2
3202 * subsystem (hence not usable here) and the second choice
3203 * exists, we fall straight back to that.
3206 char *cmd
= cfg
.remote_cmd_ptr
;
3208 if (cfg
.ssh_subsys
&& cfg
.remote_cmd_ptr2
) {
3209 cmd
= cfg
.remote_cmd_ptr2
;
3210 ssh
->fallback_cmd
= TRUE
;
3213 send_packet(ssh
, SSH1_CMSG_EXEC_CMD
, PKT_STR
, cmd
, PKT_END
);
3215 send_packet(ssh
, SSH1_CMSG_EXEC_SHELL
, PKT_END
);
3216 logevent("Started session");
3219 ssh
->state
= SSH_STATE_SESSION
;
3220 if (ssh
->size_needed
)
3221 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
3222 if (ssh
->eof_needed
)
3223 ssh_special(ssh
, TS_EOF
);
3225 ldisc_send(NULL
, 0, 0); /* cause ldisc to notice changes */
3227 ssh
->channels
= newtree234(ssh_channelcmp
);
3231 if (ssh
->pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
3232 ssh
->pktin
.type
== SSH1_SMSG_STDERR_DATA
) {
3233 long len
= GET_32BIT(ssh
->pktin
.body
);
3235 from_backend(ssh
->frontend
,
3236 ssh
->pktin
.type
== SSH1_SMSG_STDERR_DATA
,
3237 ssh
->pktin
.body
+ 4, len
);
3238 if (!ssh
->v1_stdout_throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
3239 ssh
->v1_stdout_throttling
= 1;
3240 ssh1_throttle(ssh
, +1);
3242 } else if (ssh
->pktin
.type
== SSH1_MSG_DISCONNECT
) {
3243 ssh
->state
= SSH_STATE_CLOSED
;
3244 logevent("Received disconnect request");
3246 } else if (ssh
->pktin
.type
== SSH1_SMSG_X11_OPEN
) {
3247 /* Remote side is trying to open a channel to talk to our
3248 * X-Server. Give them back a local channel number. */
3249 struct ssh_channel
*c
;
3251 logevent("Received X11 connect request");
3252 /* Refuse if X11 forwarding is disabled. */
3253 if (!ssh
->X11_fwd_enabled
) {
3254 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3255 PKT_INT
, GET_32BIT(ssh
->pktin
.body
), PKT_END
);
3256 logevent("Rejected X11 connect request");
3258 c
= smalloc(sizeof(struct ssh_channel
));
3261 if (x11_init(&c
->u
.x11
.s
, cfg
.x11_display
, c
) != NULL
) {
3262 logevent("opening X11 forward connection failed");
3264 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3265 PKT_INT
, GET_32BIT(ssh
->pktin
.body
),
3269 ("opening X11 forward connection succeeded");
3270 c
->remoteid
= GET_32BIT(ssh
->pktin
.body
);
3271 c
->localid
= alloc_channel_id(ssh
);
3273 c
->v
.v1
.throttling
= 0;
3274 c
->type
= CHAN_X11
; /* identify channel type */
3275 add234(ssh
->channels
, c
);
3276 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3277 PKT_INT
, c
->remoteid
, PKT_INT
,
3278 c
->localid
, PKT_END
);
3279 logevent("Opened X11 forward channel");
3282 } else if (ssh
->pktin
.type
== SSH1_SMSG_AGENT_OPEN
) {
3283 /* Remote side is trying to open a channel to talk to our
3284 * agent. Give them back a local channel number. */
3285 struct ssh_channel
*c
;
3287 /* Refuse if agent forwarding is disabled. */
3288 if (!ssh
->agentfwd_enabled
) {
3289 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3290 PKT_INT
, GET_32BIT(ssh
->pktin
.body
), PKT_END
);
3292 c
= smalloc(sizeof(struct ssh_channel
));
3294 c
->remoteid
= GET_32BIT(ssh
->pktin
.body
);
3295 c
->localid
= alloc_channel_id(ssh
);
3297 c
->v
.v1
.throttling
= 0;
3298 c
->type
= CHAN_AGENT
; /* identify channel type */
3299 c
->u
.a
.lensofar
= 0;
3300 add234(ssh
->channels
, c
);
3301 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3302 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
3305 } else if (ssh
->pktin
.type
== SSH1_MSG_PORT_OPEN
) {
3306 /* Remote side is trying to open a channel to talk to a
3307 * forwarded port. Give them back a local channel number. */
3308 struct ssh_channel
*c
;
3309 struct ssh_rportfwd pf
;
3311 char host
[256], buf
[1024];
3313 c
= smalloc(sizeof(struct ssh_channel
));
3316 hostsize
= GET_32BIT(ssh
->pktin
.body
+4);
3317 for(h
= host
, p
= ssh
->pktin
.body
+8; hostsize
!= 0; hostsize
--) {
3318 if (h
+1 < host
+sizeof(host
))
3323 port
= GET_32BIT(p
);
3325 strcpy(pf
.dhost
, host
);
3328 if (find234(ssh
->rportfwds
, &pf
, NULL
) == NULL
) {
3329 sprintf(buf
, "Rejected remote port open request for %s:%d",
3332 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3333 PKT_INT
, GET_32BIT(ssh
->pktin
.body
), PKT_END
);
3335 sprintf(buf
, "Received remote port open request for %s:%d",
3338 e
= pfd_newconnect(&c
->u
.pfd
.s
, host
, port
, c
);
3341 sprintf(buf
, "Port open failed: %s", e
);
3344 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_FAILURE
,
3345 PKT_INT
, GET_32BIT(ssh
->pktin
.body
),
3348 c
->remoteid
= GET_32BIT(ssh
->pktin
.body
);
3349 c
->localid
= alloc_channel_id(ssh
);
3351 c
->v
.v1
.throttling
= 0;
3352 c
->type
= CHAN_SOCKDATA
; /* identify channel type */
3353 add234(ssh
->channels
, c
);
3354 send_packet(ssh
, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
3355 PKT_INT
, c
->remoteid
, PKT_INT
,
3356 c
->localid
, PKT_END
);
3357 logevent("Forwarded port opened successfully");
3361 } else if (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
) {
3362 unsigned int remoteid
= GET_32BIT(ssh
->pktin
.body
);
3363 unsigned int localid
= GET_32BIT(ssh
->pktin
.body
+4);
3364 struct ssh_channel
*c
;
3366 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
3367 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
3368 c
->remoteid
= localid
;
3369 c
->type
= CHAN_SOCKDATA
;
3370 c
->v
.v1
.throttling
= 0;
3371 pfd_confirm(c
->u
.pfd
.s
);
3374 if (c
&& c
->closes
) {
3376 * We have a pending close on this channel,
3377 * which we decided on before the server acked
3378 * the channel open. So now we know the
3379 * remoteid, we can close it again.
3381 send_packet(ssh
, SSH1_MSG_CHANNEL_CLOSE
,
3382 PKT_INT
, c
->remoteid
, PKT_END
);
3385 } else if (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_OPEN_FAILURE
) {
3386 unsigned int remoteid
= GET_32BIT(ssh
->pktin
.body
);
3387 unsigned int localid
= GET_32BIT(ssh
->pktin
.body
+4);
3388 struct ssh_channel
*c
;
3390 c
= find234(ssh
->channels
, &remoteid
, ssh_channelfind
);
3391 if (c
&& c
->type
== CHAN_SOCKDATA_DORMANT
) {
3392 logevent("Forwarded connection refused by server");
3393 pfd_close(c
->u
.pfd
.s
);
3394 del234(ssh
->channels
, c
);
3398 } else if (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_CLOSE
||
3399 ssh
->pktin
.type
== SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
) {
3400 /* Remote side closes a channel. */
3401 unsigned i
= GET_32BIT(ssh
->pktin
.body
);
3402 struct ssh_channel
*c
;
3403 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
3404 if (c
&& ((int)c
->remoteid
) != -1) {
3407 (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_CLOSE ?
1 : 2);
3409 if ((c
->closes
== 0) && (c
->type
== CHAN_X11
)) {
3410 logevent("Forwarded X11 connection terminated");
3411 assert(c
->u
.x11
.s
!= NULL
);
3412 x11_close(c
->u
.x11
.s
);
3415 if ((c
->closes
== 0) && (c
->type
== CHAN_SOCKDATA
)) {
3416 logevent("Forwarded port closed");
3417 assert(c
->u
.pfd
.s
!= NULL
);
3418 pfd_close(c
->u
.pfd
.s
);
3422 c
->closes
|= (closetype
<< 2); /* seen this message */
3423 if (!(c
->closes
& closetype
)) {
3424 send_packet(ssh
, ssh
->pktin
.type
, PKT_INT
, c
->remoteid
,
3426 c
->closes
|= closetype
; /* sent it too */
3429 if (c
->closes
== 15) {
3430 del234(ssh
->channels
, c
);
3434 bombout(("Received CHANNEL_CLOSE%s for %s channel %d\n",
3435 ssh
->pktin
.type
== SSH1_MSG_CHANNEL_CLOSE ?
"" :
3436 "_CONFIRMATION", c ?
"half-open" : "nonexistent",
3439 } else if (ssh
->pktin
.type
== SSH1_MSG_CHANNEL_DATA
) {
3440 /* Data sent down one of our channels. */
3441 int i
= GET_32BIT(ssh
->pktin
.body
);
3442 int len
= GET_32BIT(ssh
->pktin
.body
+ 4);
3443 unsigned char *p
= ssh
->pktin
.body
+ 8;
3444 struct ssh_channel
*c
;
3445 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
3450 bufsize
= x11_send(c
->u
.x11
.s
, p
, len
);
3453 bufsize
= pfd_send(c
->u
.pfd
.s
, p
, len
);
3456 /* Data for an agent message. Buffer it. */
3458 if (c
->u
.a
.lensofar
< 4) {
3459 int l
= min(4 - c
->u
.a
.lensofar
, len
);
3460 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
, p
,
3464 c
->u
.a
.lensofar
+= l
;
3466 if (c
->u
.a
.lensofar
== 4) {
3468 4 + GET_32BIT(c
->u
.a
.msglen
);
3469 c
->u
.a
.message
= smalloc(c
->u
.a
.totallen
);
3470 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
3472 if (c
->u
.a
.lensofar
>= 4 && len
> 0) {
3474 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
3476 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
, p
,
3480 c
->u
.a
.lensofar
+= l
;
3482 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
3483 void *reply
, *sentreply
;
3485 agent_query(c
->u
.a
.message
,
3486 c
->u
.a
.totallen
, &reply
,
3491 /* Fake SSH_AGENT_FAILURE. */
3492 sentreply
= "\0\0\0\1\5";
3495 send_packet(ssh
, SSH1_MSG_CHANNEL_DATA
,
3496 PKT_INT
, c
->remoteid
,
3498 PKT_DATA
, sentreply
, replylen
,
3502 sfree(c
->u
.a
.message
);
3503 c
->u
.a
.lensofar
= 0;
3506 bufsize
= 0; /* agent channels never back up */
3509 if (!c
->v
.v1
.throttling
&& bufsize
> SSH1_BUFFER_LIMIT
) {
3510 c
->v
.v1
.throttling
= 1;
3511 ssh1_throttle(ssh
, +1);
3514 } else if (ssh
->pktin
.type
== SSH1_SMSG_SUCCESS
) {
3515 /* may be from EXEC_SHELL on some servers */
3516 } else if (ssh
->pktin
.type
== SSH1_SMSG_FAILURE
) {
3517 /* may be from EXEC_SHELL on some servers
3518 * if no pty is available or in other odd cases. Ignore */
3519 } else if (ssh
->pktin
.type
== SSH1_SMSG_EXIT_STATUS
) {
3521 ssh
->exitcode
= GET_32BIT(ssh
->pktin
.body
);
3522 sprintf(buf
, "Server sent command exit status %d",
3525 send_packet(ssh
, SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
3527 * In case `helpful' firewalls or proxies tack
3528 * extra human-readable text on the end of the
3529 * session which we might mistake for another
3530 * encrypted packet, we close the session once
3531 * we've sent EXIT_CONFIRMATION.
3533 ssh
->state
= SSH_STATE_CLOSED
;
3536 bombout(("Strange packet received: type %d", ssh
->pktin
.type
));
3541 int len
= min(inlen
, 512);
3542 send_packet(ssh
, SSH1_CMSG_STDIN_DATA
,
3543 PKT_INT
, len
, PKT_DATA
, in
, len
, PKT_END
);
3554 * Utility routine for decoding comma-separated strings in KEXINIT.
3556 static int in_commasep_string(char *needle
, char *haystack
, int haylen
)
3558 int needlen
= strlen(needle
);
3561 * Is it at the start of the string?
3563 if (haylen
>= needlen
&& /* haystack is long enough */
3564 !memcmp(needle
, haystack
, needlen
) && /* initial match */
3565 (haylen
== needlen
|| haystack
[needlen
] == ',')
3566 /* either , or EOS follows */
3570 * If not, search for the next comma and resume after that.
3571 * If no comma found, terminate.
3573 while (haylen
> 0 && *haystack
!= ',')
3574 haylen
--, haystack
++;
3577 haylen
--, haystack
++; /* skip over comma itself */
3582 * SSH2 key creation method.
3584 static void ssh2_mkkey(Ssh ssh
, Bignum K
, char *H
, char *sessid
, char chr
,
3588 /* First 20 bytes. */
3590 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
3592 SHA_Bytes(&s
, H
, 20);
3593 SHA_Bytes(&s
, &chr
, 1);
3594 SHA_Bytes(&s
, sessid
, 20);
3595 SHA_Final(&s
, keyspace
);
3596 /* Next 20 bytes. */
3598 if (!(ssh
->remote_bugs
& BUG_SSH2_DERIVEKEY
))
3600 SHA_Bytes(&s
, H
, 20);
3601 SHA_Bytes(&s
, keyspace
, 20);
3602 SHA_Final(&s
, keyspace
+ 20);
3606 * Handle the SSH2 transport layer.
3608 static int do_ssh2_transport(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
3610 struct do_ssh2_transport_state
{
3611 int nbits
, pbits
, warn
;
3612 Bignum p
, g
, e
, f
, K
;
3613 int kex_init_value
, kex_reply_value
;
3614 const struct ssh_mac
**maclist
;
3616 const struct ssh2_cipher
*cscipher_tobe
;
3617 const struct ssh2_cipher
*sccipher_tobe
;
3618 const struct ssh_mac
*csmac_tobe
;
3619 const struct ssh_mac
*scmac_tobe
;
3620 const struct ssh_compress
*cscomp_tobe
;
3621 const struct ssh_compress
*sccomp_tobe
;
3622 char *hostkeydata
, *sigdata
, *keystr
, *fingerprint
;
3623 int hostkeylen
, siglen
;
3624 void *hkey
; /* actual host key */
3625 unsigned char exchange_hash
[20];
3626 int n_preferred_ciphers
;
3627 const struct ssh2_ciphers
*preferred_ciphers
[CIPHER_MAX
];
3628 const struct ssh_compress
*preferred_comp
;
3631 crState(do_ssh2_transport_state
);
3633 crBegin(ssh
->do_ssh2_transport_crstate
);
3635 s
->cscipher_tobe
= s
->sccipher_tobe
= NULL
;
3636 s
->csmac_tobe
= s
->scmac_tobe
= NULL
;
3637 s
->cscomp_tobe
= s
->sccomp_tobe
= NULL
;
3645 * Set up the preferred ciphers. (NULL => warn below here)
3647 s
->n_preferred_ciphers
= 0;
3648 for (i
= 0; i
< CIPHER_MAX
; i
++) {
3649 switch (cfg
.ssh_cipherlist
[i
]) {
3650 case CIPHER_BLOWFISH
:
3651 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_blowfish
;
3654 if (cfg
.ssh2_des_cbc
) {
3655 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_des
;
3659 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_3des
;
3662 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = &ssh2_aes
;
3665 /* Flag for later. Don't bother if it's the last in
3667 if (i
< CIPHER_MAX
- 1) {
3668 s
->preferred_ciphers
[s
->n_preferred_ciphers
++] = NULL
;
3676 * Set up preferred compression.
3678 if (cfg
.compression
)
3679 s
->preferred_comp
= &ssh_zlib
;
3681 s
->preferred_comp
= &ssh_comp_none
;
3684 * Be prepared to work around the buggy MAC problem.
3686 if (ssh
->remote_bugs
& BUG_SSH2_HMAC
)
3687 s
->maclist
= buggymacs
, s
->nmacs
= lenof(buggymacs
);
3689 s
->maclist
= macs
, s
->nmacs
= lenof(macs
);
3693 int i
, j
, cipherstr_started
;
3696 * Construct and send our key exchange packet.
3698 ssh2_pkt_init(ssh
, SSH2_MSG_KEXINIT
);
3699 for (i
= 0; i
< 16; i
++)
3700 ssh2_pkt_addbyte(ssh
, (unsigned char) random_byte());
3701 /* List key exchange algorithms. */
3702 ssh2_pkt_addstring_start(ssh
);
3703 for (i
= 0; i
< lenof(kex_algs
); i
++) {
3704 if (kex_algs
[i
] == &ssh_diffiehellman_gex
&&
3705 (ssh
->remote_bugs
& BUG_SSH2_DH_GEX
))
3707 ssh2_pkt_addstring_str(ssh
, kex_algs
[i
]->name
);
3708 if (i
< lenof(kex_algs
) - 1)
3709 ssh2_pkt_addstring_str(ssh
, ",");
3711 /* List server host key algorithms. */
3712 ssh2_pkt_addstring_start(ssh
);
3713 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
3714 ssh2_pkt_addstring_str(ssh
, hostkey_algs
[i
]->name
);
3715 if (i
< lenof(hostkey_algs
) - 1)
3716 ssh2_pkt_addstring_str(ssh
, ",");
3718 /* List client->server encryption algorithms. */
3719 ssh2_pkt_addstring_start(ssh
);
3720 cipherstr_started
= 0;
3721 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
3722 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
3723 if (!c
) continue; /* warning flag */
3724 for (j
= 0; j
< c
->nciphers
; j
++) {
3725 if (cipherstr_started
)
3726 ssh2_pkt_addstring_str(ssh
, ",");
3727 ssh2_pkt_addstring_str(ssh
, c
->list
[j
]->name
);
3728 cipherstr_started
= 1;
3731 /* List server->client encryption algorithms. */
3732 ssh2_pkt_addstring_start(ssh
);
3733 cipherstr_started
= 0;
3734 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
3735 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
3736 if (!c
) continue; /* warning flag */
3737 for (j
= 0; j
< c
->nciphers
; j
++) {
3738 if (cipherstr_started
)
3739 ssh2_pkt_addstring_str(ssh
, ",");
3740 ssh2_pkt_addstring_str(ssh
, c
->list
[j
]->name
);
3741 cipherstr_started
= 1;
3744 /* List client->server MAC algorithms. */
3745 ssh2_pkt_addstring_start(ssh
);
3746 for (i
= 0; i
< s
->nmacs
; i
++) {
3747 ssh2_pkt_addstring_str(ssh
, s
->maclist
[i
]->name
);
3748 if (i
< s
->nmacs
- 1)
3749 ssh2_pkt_addstring_str(ssh
, ",");
3751 /* List server->client MAC algorithms. */
3752 ssh2_pkt_addstring_start(ssh
);
3753 for (i
= 0; i
< s
->nmacs
; i
++) {
3754 ssh2_pkt_addstring_str(ssh
, s
->maclist
[i
]->name
);
3755 if (i
< s
->nmacs
- 1)
3756 ssh2_pkt_addstring_str(ssh
, ",");
3758 /* List client->server compression algorithms. */
3759 ssh2_pkt_addstring_start(ssh
);
3760 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
3761 const struct ssh_compress
*c
=
3762 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
3763 ssh2_pkt_addstring_str(ssh
, c
->name
);
3764 if (i
< lenof(compressions
))
3765 ssh2_pkt_addstring_str(ssh
, ",");
3767 /* List server->client compression algorithms. */
3768 ssh2_pkt_addstring_start(ssh
);
3769 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
3770 const struct ssh_compress
*c
=
3771 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
3772 ssh2_pkt_addstring_str(ssh
, c
->name
);
3773 if (i
< lenof(compressions
))
3774 ssh2_pkt_addstring_str(ssh
, ",");
3776 /* List client->server languages. Empty list. */
3777 ssh2_pkt_addstring_start(ssh
);
3778 /* List server->client languages. Empty list. */
3779 ssh2_pkt_addstring_start(ssh
);
3780 /* First KEX packet does _not_ follow, because we're not that brave. */
3781 ssh2_pkt_addbool(ssh
, FALSE
);
3783 ssh2_pkt_adduint32(ssh
, 0);
3786 ssh
->exhash
= ssh
->exhashbase
;
3787 sha_string(&ssh
->exhash
, ssh
->pktout
.data
+ 5, ssh
->pktout
.length
- 5);
3793 sha_string(&ssh
->exhash
, ssh
->pktin
.data
+ 5, ssh
->pktin
.length
- 5);
3796 * Now examine the other side's KEXINIT to see what we're up
3803 if (ssh
->pktin
.type
!= SSH2_MSG_KEXINIT
) {
3804 bombout(("expected key exchange packet from server"));
3808 ssh
->hostkey
= NULL
;
3809 s
->cscipher_tobe
= NULL
;
3810 s
->sccipher_tobe
= NULL
;
3811 s
->csmac_tobe
= NULL
;
3812 s
->scmac_tobe
= NULL
;
3813 s
->cscomp_tobe
= NULL
;
3814 s
->sccomp_tobe
= NULL
;
3815 ssh
->pktin
.savedpos
+= 16; /* skip garbage cookie */
3816 ssh2_pkt_getstring(ssh
, &str
, &len
); /* key exchange algorithms */
3817 for (i
= 0; i
< lenof(kex_algs
); i
++) {
3818 if (kex_algs
[i
] == &ssh_diffiehellman_gex
&&
3819 (ssh
->remote_bugs
& BUG_SSH2_DH_GEX
))
3821 if (in_commasep_string(kex_algs
[i
]->name
, str
, len
)) {
3822 ssh
->kex
= kex_algs
[i
];
3826 ssh2_pkt_getstring(ssh
, &str
, &len
); /* host key algorithms */
3827 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
3828 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
3829 ssh
->hostkey
= hostkey_algs
[i
];
3833 ssh2_pkt_getstring(ssh
, &str
, &len
); /* client->server cipher */
3835 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
3836 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
3840 for (j
= 0; j
< c
->nciphers
; j
++) {
3841 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
3842 s
->cscipher_tobe
= c
->list
[j
];
3847 if (s
->cscipher_tobe
) {
3849 askcipher(s
->cscipher_tobe
->name
, 1);
3853 if (!s
->cscipher_tobe
) {
3854 bombout(("Couldn't agree a client-to-server cipher (available: %s)", str
));
3858 ssh2_pkt_getstring(ssh
, &str
, &len
); /* server->client cipher */
3860 for (i
= 0; i
< s
->n_preferred_ciphers
; i
++) {
3861 const struct ssh2_ciphers
*c
= s
->preferred_ciphers
[i
];
3865 for (j
= 0; j
< c
->nciphers
; j
++) {
3866 if (in_commasep_string(c
->list
[j
]->name
, str
, len
)) {
3867 s
->sccipher_tobe
= c
->list
[j
];
3872 if (s
->sccipher_tobe
) {
3874 askcipher(s
->sccipher_tobe
->name
, 2);
3878 if (!s
->sccipher_tobe
) {
3879 bombout(("Couldn't agree a server-to-client cipher (available: %s)", str
));
3883 ssh2_pkt_getstring(ssh
, &str
, &len
); /* client->server mac */
3884 for (i
= 0; i
< s
->nmacs
; i
++) {
3885 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
3886 s
->csmac_tobe
= s
->maclist
[i
];
3890 ssh2_pkt_getstring(ssh
, &str
, &len
); /* server->client mac */
3891 for (i
= 0; i
< s
->nmacs
; i
++) {
3892 if (in_commasep_string(s
->maclist
[i
]->name
, str
, len
)) {
3893 s
->scmac_tobe
= s
->maclist
[i
];
3897 ssh2_pkt_getstring(ssh
, &str
, &len
); /* client->server compression */
3898 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
3899 const struct ssh_compress
*c
=
3900 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
3901 if (in_commasep_string(c
->name
, str
, len
)) {
3906 ssh2_pkt_getstring(ssh
, &str
, &len
); /* server->client compression */
3907 for (i
= 0; i
< lenof(compressions
) + 1; i
++) {
3908 const struct ssh_compress
*c
=
3909 i
== 0 ? s
->preferred_comp
: compressions
[i
- 1];
3910 if (in_commasep_string(c
->name
, str
, len
)) {
3918 * Work out the number of bits of key we will need from the key
3919 * exchange. We start with the maximum key length of either
3925 csbits
= s
->cscipher_tobe
->keylen
;
3926 scbits
= s
->sccipher_tobe
->keylen
;
3927 s
->nbits
= (csbits
> scbits ? csbits
: scbits
);
3929 /* The keys only have 160-bit entropy, since they're based on
3930 * a SHA-1 hash. So cap the key size at 160 bits. */
3935 * If we're doing Diffie-Hellman group exchange, start by
3936 * requesting a group.
3938 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
3939 logevent("Doing Diffie-Hellman group exchange");
3940 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGEX
;
3942 * Work out how big a DH group we will need to allow that
3945 s
->pbits
= 512 << ((s
->nbits
- 1) / 64);
3946 ssh2_pkt_init(ssh
, SSH2_MSG_KEX_DH_GEX_REQUEST
);
3947 ssh2_pkt_adduint32(ssh
, s
->pbits
);
3951 if (ssh
->pktin
.type
!= SSH2_MSG_KEX_DH_GEX_GROUP
) {
3952 bombout(("expected key exchange group packet from server"));
3955 s
->p
= ssh2_pkt_getmp(ssh
);
3956 s
->g
= ssh2_pkt_getmp(ssh
);
3957 ssh
->kex_ctx
= dh_setup_group(s
->p
, s
->g
);
3958 s
->kex_init_value
= SSH2_MSG_KEX_DH_GEX_INIT
;
3959 s
->kex_reply_value
= SSH2_MSG_KEX_DH_GEX_REPLY
;
3961 ssh
->pkt_ctx
|= SSH2_PKTCTX_DHGROUP1
;
3962 ssh
->kex_ctx
= dh_setup_group1();
3963 s
->kex_init_value
= SSH2_MSG_KEXDH_INIT
;
3964 s
->kex_reply_value
= SSH2_MSG_KEXDH_REPLY
;
3967 logevent("Doing Diffie-Hellman key exchange");
3969 * Now generate and send e for Diffie-Hellman.
3971 s
->e
= dh_create_e(ssh
->kex_ctx
, s
->nbits
* 2);
3972 ssh2_pkt_init(ssh
, s
->kex_init_value
);
3973 ssh2_pkt_addmp(ssh
, s
->e
);
3977 if (ssh
->pktin
.type
!= s
->kex_reply_value
) {
3978 bombout(("expected key exchange reply packet from server"));
3981 ssh2_pkt_getstring(ssh
, &s
->hostkeydata
, &s
->hostkeylen
);
3982 s
->f
= ssh2_pkt_getmp(ssh
);
3983 ssh2_pkt_getstring(ssh
, &s
->sigdata
, &s
->siglen
);
3985 s
->K
= dh_find_K(ssh
->kex_ctx
, s
->f
);
3987 sha_string(&ssh
->exhash
, s
->hostkeydata
, s
->hostkeylen
);
3988 if (ssh
->kex
== &ssh_diffiehellman_gex
) {
3989 sha_uint32(&ssh
->exhash
, s
->pbits
);
3990 sha_mpint(&ssh
->exhash
, s
->p
);
3991 sha_mpint(&ssh
->exhash
, s
->g
);
3993 sha_mpint(&ssh
->exhash
, s
->e
);
3994 sha_mpint(&ssh
->exhash
, s
->f
);
3995 sha_mpint(&ssh
->exhash
, s
->K
);
3996 SHA_Final(&ssh
->exhash
, s
->exchange_hash
);
3998 dh_cleanup(ssh
->kex_ctx
);
4001 debug(("Exchange hash is:\n"));
4002 dmemdump(s
->exchange_hash
, 20);
4005 s
->hkey
= ssh
->hostkey
->newkey(s
->hostkeydata
, s
->hostkeylen
);
4007 !ssh
->hostkey
->verifysig(s
->hkey
, s
->sigdata
, s
->siglen
,
4008 s
->exchange_hash
, 20)) {
4009 bombout(("Server's host key did not match the signature supplied"));
4014 * Authenticate remote host: verify host key. (We've already
4015 * checked the signature of the exchange hash.)
4017 s
->keystr
= ssh
->hostkey
->fmtkey(s
->hkey
);
4018 s
->fingerprint
= ssh
->hostkey
->fingerprint(s
->hkey
);
4019 verify_ssh_host_key(ssh
->savedhost
, ssh
->savedport
, ssh
->hostkey
->keytype
,
4020 s
->keystr
, s
->fingerprint
);
4021 if (s
->first_kex
) { /* don't bother logging this in rekeys */
4022 logevent("Host key fingerprint is:");
4023 logevent(s
->fingerprint
);
4025 sfree(s
->fingerprint
);
4027 ssh
->hostkey
->freekey(s
->hkey
);
4030 * Send SSH2_MSG_NEWKEYS.
4032 ssh2_pkt_init(ssh
, SSH2_MSG_NEWKEYS
);
4036 * Expect SSH2_MSG_NEWKEYS from server.
4039 if (ssh
->pktin
.type
!= SSH2_MSG_NEWKEYS
) {
4040 bombout(("expected new-keys packet from server"));
4045 * Create and initialise session keys.
4047 if (ssh
->cs_cipher_ctx
)
4048 ssh
->cscipher
->free_context(ssh
->cs_cipher_ctx
);
4049 ssh
->cscipher
= s
->cscipher_tobe
;
4050 ssh
->cs_cipher_ctx
= ssh
->cscipher
->make_context();
4052 if (ssh
->sc_cipher_ctx
)
4053 ssh
->sccipher
->free_context(ssh
->sc_cipher_ctx
);
4054 ssh
->sccipher
= s
->sccipher_tobe
;
4055 ssh
->sc_cipher_ctx
= ssh
->sccipher
->make_context();
4057 if (ssh
->cs_mac_ctx
)
4058 ssh
->csmac
->free_context(ssh
->cs_mac_ctx
);
4059 ssh
->csmac
= s
->csmac_tobe
;
4060 ssh
->cs_mac_ctx
= ssh
->csmac
->make_context();
4062 if (ssh
->sc_mac_ctx
)
4063 ssh
->scmac
->free_context(ssh
->sc_mac_ctx
);
4064 ssh
->scmac
= s
->scmac_tobe
;
4065 ssh
->sc_mac_ctx
= ssh
->scmac
->make_context();
4067 ssh
->cscomp
= s
->cscomp_tobe
;
4068 ssh
->sccomp
= s
->sccomp_tobe
;
4069 ssh
->cscomp
->compress_init();
4070 ssh
->sccomp
->decompress_init();
4072 * Set IVs after keys. Here we use the exchange hash from the
4073 * _first_ key exchange.
4076 unsigned char keyspace
[40];
4078 memcpy(ssh
->v2_session_id
, s
->exchange_hash
,
4079 sizeof(s
->exchange_hash
));
4080 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'C',keyspace
);
4081 ssh
->cscipher
->setkey(ssh
->cs_cipher_ctx
, keyspace
);
4082 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'D',keyspace
);
4083 ssh
->sccipher
->setkey(ssh
->sc_cipher_ctx
, keyspace
);
4084 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'A',keyspace
);
4085 ssh
->cscipher
->setiv(ssh
->cs_cipher_ctx
, keyspace
);
4086 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'B',keyspace
);
4087 ssh
->sccipher
->setiv(ssh
->sc_cipher_ctx
, keyspace
);
4088 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'E',keyspace
);
4089 ssh
->csmac
->setkey(ssh
->cs_mac_ctx
, keyspace
);
4090 ssh2_mkkey(ssh
,s
->K
,s
->exchange_hash
,ssh
->v2_session_id
,'F',keyspace
);
4091 ssh
->scmac
->setkey(ssh
->sc_mac_ctx
, keyspace
);
4095 sprintf(buf
, "Initialised %.200s client->server encryption",
4096 ssh
->cscipher
->text_name
);
4098 sprintf(buf
, "Initialised %.200s server->client encryption",
4099 ssh
->sccipher
->text_name
);
4105 * If this is the first key exchange phase, we must pass the
4106 * SSH2_MSG_NEWKEYS packet to the next layer, not because it
4107 * wants to see it but because it will need time to initialise
4108 * itself before it sees an actual packet. In subsequent key
4109 * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because
4110 * it would only confuse the layer above.
4112 if (!s
->first_kex
) {
4118 * Now we're encrypting. Begin returning 1 to the protocol main
4119 * function so that other things can run on top of the
4120 * transport. If we ever see a KEXINIT, we must go back to the
4123 while (!(ispkt
&& ssh
->pktin
.type
== SSH2_MSG_KEXINIT
)) {
4126 logevent("Server initiated key re-exchange");
4127 goto begin_key_exchange
;
4133 * Add data to an SSH2 channel output buffer.
4135 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
,
4138 bufchain_add(&c
->v
.v2
.outbuffer
, buf
, len
);
4142 * Attempt to send data on an SSH2 channel.
4144 static int ssh2_try_send(struct ssh_channel
*c
)
4148 while (c
->v
.v2
.remwindow
> 0 && bufchain_size(&c
->v
.v2
.outbuffer
) > 0) {
4151 bufchain_prefix(&c
->v
.v2
.outbuffer
, &data
, &len
);
4152 if ((unsigned)len
> c
->v
.v2
.remwindow
)
4153 len
= c
->v
.v2
.remwindow
;
4154 if ((unsigned)len
> c
->v
.v2
.remmaxpkt
)
4155 len
= c
->v
.v2
.remmaxpkt
;
4156 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_DATA
);
4157 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
4158 ssh2_pkt_addstring_start(ssh
);
4159 ssh2_pkt_addstring_data(ssh
, data
, len
);
4161 bufchain_consume(&c
->v
.v2
.outbuffer
, len
);
4162 c
->v
.v2
.remwindow
-= len
;
4166 * After having sent as much data as we can, return the amount
4169 return bufchain_size(&c
->v
.v2
.outbuffer
);
4173 * Potentially enlarge the window on an SSH2 channel.
4175 static void ssh2_set_window(struct ssh_channel
*c
, unsigned newwin
)
4180 * Never send WINDOW_ADJUST for a channel that the remote side
4181 * already thinks it's closed; there's no point, since it won't
4182 * be sending any more data anyway.
4187 if (newwin
> c
->v
.v2
.locwindow
) {
4188 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
4189 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
4190 ssh2_pkt_adduint32(ssh
, newwin
- c
->v
.v2
.locwindow
);
4192 c
->v
.v2
.locwindow
= newwin
;
4197 * Handle the SSH2 userauth and connection layers.
4199 static void do_ssh2_authconn(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
4201 struct do_ssh2_authconn_state
{
4203 AUTH_INVALID
, AUTH_PUBLICKEY_AGENT
, AUTH_PUBLICKEY_FILE
,
4205 AUTH_KEYBOARD_INTERACTIVE
4209 AUTH_TYPE_PUBLICKEY
,
4210 AUTH_TYPE_PUBLICKEY_OFFER_LOUD
,
4211 AUTH_TYPE_PUBLICKEY_OFFER_QUIET
,
4213 AUTH_TYPE_KEYBOARD_INTERACTIVE
,
4214 AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
4216 int gotit
, need_pw
, can_pubkey
, can_passwd
, can_keyb_inter
;
4217 int tried_pubkey_config
, tried_agent
, tried_keyb_inter
;
4218 int kbd_inter_running
;
4220 int num_prompts
, curr_prompt
, echo
;
4225 void *publickey_blob
;
4226 int publickey_bloblen
;
4227 unsigned char request
[5], *response
, *p
;
4231 char *pkblob
, *alg
, *commentp
;
4232 int pklen
, alglen
, commentlen
;
4233 int siglen
, retlen
, len
;
4234 char *q
, *agentreq
, *ret
;
4237 crState(do_ssh2_authconn_state
);
4239 crBegin(ssh
->do_ssh2_authconn_crstate
);
4242 * Request userauth protocol, and await a response to it.
4244 ssh2_pkt_init(ssh
, SSH2_MSG_SERVICE_REQUEST
);
4245 ssh2_pkt_addstring(ssh
, "ssh-userauth");
4247 crWaitUntilV(ispkt
);
4248 if (ssh
->pktin
.type
!= SSH2_MSG_SERVICE_ACCEPT
) {
4249 bombout(("Server refused user authentication protocol"));
4254 * We repeat this whole loop, including the username prompt,
4255 * until we manage a successful authentication. If the user
4256 * types the wrong _password_, they can be sent back to the
4257 * beginning to try another username, if this is configured on.
4258 * (If they specify a username in the config, they are never
4259 * asked, even if they do give a wrong password.)
4261 * I think this best serves the needs of
4263 * - the people who have no configuration, no keys, and just
4264 * want to try repeated (username,password) pairs until they
4265 * type both correctly
4267 * - people who have keys and configuration but occasionally
4268 * need to fall back to passwords
4270 * - people with a key held in Pageant, who might not have
4271 * logged in to a particular machine before; so they want to
4272 * type a username, and then _either_ their key will be
4273 * accepted, _or_ they will type a password. If they mistype
4274 * the username they will want to be able to get back and
4277 s
->username
[0] = '\0';
4278 s
->got_username
= FALSE
;
4283 if (s
->got_username
&& !cfg
.change_username
) {
4285 * We got a username last time round this loop, and
4286 * with change_username turned off we don't try to get
4289 } else if ((flags
& FLAG_INTERACTIVE
) && !*cfg
.username
) {
4290 if (ssh_get_line
&& !ssh_getline_pw_only
) {
4291 if (!ssh_get_line("login as: ",
4292 s
->username
, sizeof(s
->username
), FALSE
)) {
4294 * get_line failed to get a username.
4297 logevent("No username provided. Abandoning session.");
4298 ssh
->state
= SSH_STATE_CLOSED
;
4302 int ret
; /* need not be saved across crReturn */
4303 c_write_str(ssh
, "login as: ");
4305 setup_userpass_input(ssh
, s
->username
, sizeof(s
->username
), 1);
4307 crWaitUntilV(!ispkt
);
4308 ret
= process_userpass_input(ssh
, in
, inlen
);
4313 c_write_str(ssh
, "\r\n");
4314 s
->username
[strcspn(s
->username
, "\n\r")] = '\0';
4317 strncpy(s
->username
, cfg
.username
, sizeof(s
->username
));
4318 s
->username
[sizeof(s
->username
)-1] = '\0';
4319 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
4320 sprintf(stuff
, "Using username \"%s\".\r\n", s
->username
);
4321 c_write_str(ssh
, stuff
);
4324 s
->got_username
= TRUE
;
4327 * Send an authentication request using method "none": (a)
4328 * just in case it succeeds, and (b) so that we know what
4329 * authentication methods we can usefully try next.
4331 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4333 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4334 ssh2_pkt_addstring(ssh
, s
->username
);
4335 ssh2_pkt_addstring(ssh
, "ssh-connection");/* service requested */
4336 ssh2_pkt_addstring(ssh
, "none"); /* method */
4338 s
->type
= AUTH_TYPE_NONE
;
4340 s
->we_are_in
= FALSE
;
4342 s
->tried_pubkey_config
= FALSE
;
4343 s
->tried_agent
= FALSE
;
4344 s
->tried_keyb_inter
= FALSE
;
4345 s
->kbd_inter_running
= FALSE
;
4346 /* Load the pub half of cfg.keyfile so we notice if it's in Pageant */
4349 logeventf("Reading private key file \"%.150s\"", cfg
.keyfile
);
4350 keytype
= key_type(cfg
.keyfile
);
4351 if (keytype
== SSH_KEYTYPE_SSH2
) {
4353 ssh2_userkey_loadpub(cfg
.keyfile
, NULL
,
4354 &s
->publickey_bloblen
);
4357 logeventf("Unable to use this key file (%s)",
4358 key_type_to_str(keytype
));
4359 sprintf(msgbuf
, "Unable to use key file \"%.150s\" (%s)\r\n",
4360 cfg
.keyfile
, key_type_to_str(keytype
));
4361 c_write_str(ssh
, msgbuf
);
4362 s
->publickey_blob
= NULL
;
4365 s
->publickey_blob
= NULL
;
4369 * Wait for the result of the last authentication request.
4372 crWaitUntilV(ispkt
);
4373 while (ssh
->pktin
.type
== SSH2_MSG_USERAUTH_BANNER
) {
4377 * Don't show the banner if we're operating in
4378 * non-verbose non-interactive mode. (It's probably
4379 * a script, which means nobody will read the
4380 * banner _anyway_, and moreover the printing of
4381 * the banner will screw up processing on the
4382 * output of (say) plink.)
4384 if (flags
& (FLAG_VERBOSE
| FLAG_INTERACTIVE
)) {
4385 ssh2_pkt_getstring(ssh
, &banner
, &size
);
4387 c_write_untrusted(ssh
, banner
, size
);
4389 crWaitUntilV(ispkt
);
4391 if (ssh
->pktin
.type
== SSH2_MSG_USERAUTH_SUCCESS
) {
4392 logevent("Access granted");
4393 s
->we_are_in
= TRUE
;
4397 if (s
->kbd_inter_running
&&
4398 ssh
->pktin
.type
== SSH2_MSG_USERAUTH_INFO_REQUEST
) {
4400 * This is either a further set-of-prompts packet
4401 * in keyboard-interactive authentication, or it's
4402 * the same one and we came back here with `gotit'
4403 * set. In the former case, we must reset the
4404 * curr_prompt variable.
4408 } else if (ssh
->pktin
.type
!= SSH2_MSG_USERAUTH_FAILURE
) {
4409 bombout(("Strange packet received during authentication: type %d",
4417 * OK, we're now sitting on a USERAUTH_FAILURE message, so
4418 * we can look at the string in it and know what we can
4419 * helpfully try next.
4421 if (ssh
->pktin
.type
== SSH2_MSG_USERAUTH_FAILURE
) {
4424 ssh2_pkt_getstring(ssh
, &methods
, &methlen
);
4425 s
->kbd_inter_running
= FALSE
;
4426 if (!ssh2_pkt_getbool(ssh
)) {
4428 * We have received an unequivocal Access
4429 * Denied. This can translate to a variety of
4432 * - if we'd just tried "none" authentication,
4433 * it's not worth printing anything at all
4435 * - if we'd just tried a public key _offer_,
4436 * the message should be "Server refused our
4437 * key" (or no message at all if the key
4438 * came from Pageant)
4440 * - if we'd just tried anything else, the
4441 * message really should be "Access denied".
4443 * Additionally, if we'd just tried password
4444 * authentication, we should break out of this
4445 * whole loop so as to go back to the username
4448 if (s
->type
== AUTH_TYPE_NONE
) {
4450 } else if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
||
4451 s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_QUIET
) {
4452 if (s
->type
== AUTH_TYPE_PUBLICKEY_OFFER_LOUD
)
4453 c_write_str(ssh
, "Server refused our key\r\n");
4454 logevent("Server refused public key");
4455 } else if (s
->type
==AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
) {
4456 /* server declined keyboard-interactive; ignore */
4458 c_write_str(ssh
, "Access denied\r\n");
4459 logevent("Access denied");
4460 if (s
->type
== AUTH_TYPE_PASSWORD
) {
4461 s
->we_are_in
= FALSE
;
4466 c_write_str(ssh
, "Further authentication required\r\n");
4467 logevent("Further authentication required");
4471 in_commasep_string("publickey", methods
, methlen
);
4473 in_commasep_string("password", methods
, methlen
);
4474 s
->can_keyb_inter
= cfg
.try_ki_auth
&&
4475 in_commasep_string("keyboard-interactive", methods
, methlen
);
4479 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4482 * Most password/passphrase prompts will be
4483 * non-echoing, so we set this to 0 by default.
4484 * Exception is that some keyboard-interactive prompts
4485 * can be echoing, in which case we'll set this to 1.
4489 if (!s
->method
&& s
->can_pubkey
&&
4490 agent_exists() && !s
->tried_agent
) {
4492 * Attempt public-key authentication using Pageant.
4497 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4498 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
4500 s
->tried_agent
= TRUE
;
4502 logevent("Pageant is running. Requesting keys.");
4504 /* Request the keys held by the agent. */
4505 PUT_32BIT(s
->request
, 1);
4506 s
->request
[4] = SSH2_AGENTC_REQUEST_IDENTITIES
;
4507 agent_query(s
->request
, 5, &r
, &s
->responselen
);
4508 s
->response
= (unsigned char *) r
;
4509 if (s
->response
&& s
->responselen
>= 5 &&
4510 s
->response
[4] == SSH2_AGENT_IDENTITIES_ANSWER
) {
4511 s
->p
= s
->response
+ 5;
4512 s
->nkeys
= GET_32BIT(s
->p
);
4516 sprintf(buf
, "Pageant has %d SSH2 keys", s
->nkeys
);
4519 for (s
->keyi
= 0; s
->keyi
< s
->nkeys
; s
->keyi
++) {
4524 sprintf(buf
, "Trying Pageant key #%d", s
->keyi
);
4527 s
->pklen
= GET_32BIT(s
->p
);
4529 if (s
->publickey_blob
&&
4530 s
->pklen
== s
->publickey_bloblen
&&
4531 !memcmp(s
->p
, s
->publickey_blob
,
4532 s
->publickey_bloblen
)) {
4533 logevent("This key matches configured key file");
4534 s
->tried_pubkey_config
= 1;
4538 s
->alglen
= GET_32BIT(s
->pkblob
);
4539 s
->alg
= s
->pkblob
+ 4;
4540 s
->commentlen
= GET_32BIT(s
->p
);
4543 s
->p
+= s
->commentlen
;
4544 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4545 ssh2_pkt_addstring(ssh
, s
->username
);
4546 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4547 ssh2_pkt_addstring(ssh
, "publickey"); /* method */
4548 ssh2_pkt_addbool(ssh
, FALSE
); /* no signature included */
4549 ssh2_pkt_addstring_start(ssh
);
4550 ssh2_pkt_addstring_data(ssh
, s
->alg
, s
->alglen
);
4551 ssh2_pkt_addstring_start(ssh
);
4552 ssh2_pkt_addstring_data(ssh
, s
->pkblob
, s
->pklen
);
4555 crWaitUntilV(ispkt
);
4556 if (ssh
->pktin
.type
!= SSH2_MSG_USERAUTH_PK_OK
) {
4557 logevent("Key refused");
4561 if (flags
& FLAG_VERBOSE
) {
4562 c_write_str(ssh
, "Authenticating with "
4564 c_write(ssh
, s
->commentp
, s
->commentlen
);
4565 c_write_str(ssh
, "\" from agent\r\n");
4569 * Server is willing to accept the key.
4570 * Construct a SIGN_REQUEST.
4572 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4573 ssh2_pkt_addstring(ssh
, s
->username
);
4574 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4575 ssh2_pkt_addstring(ssh
, "publickey"); /* method */
4576 ssh2_pkt_addbool(ssh
, TRUE
);
4577 ssh2_pkt_addstring_start(ssh
);
4578 ssh2_pkt_addstring_data(ssh
, s
->alg
, s
->alglen
);
4579 ssh2_pkt_addstring_start(ssh
);
4580 ssh2_pkt_addstring_data(ssh
, s
->pkblob
, s
->pklen
);
4582 s
->siglen
= ssh
->pktout
.length
- 5 + 4 + 20;
4583 s
->len
= 1; /* message type */
4584 s
->len
+= 4 + s
->pklen
; /* key blob */
4585 s
->len
+= 4 + s
->siglen
; /* data to sign */
4586 s
->len
+= 4; /* flags */
4587 s
->agentreq
= smalloc(4 + s
->len
);
4588 PUT_32BIT(s
->agentreq
, s
->len
);
4589 s
->q
= s
->agentreq
+ 4;
4590 *s
->q
++ = SSH2_AGENTC_SIGN_REQUEST
;
4591 PUT_32BIT(s
->q
, s
->pklen
);
4593 memcpy(s
->q
, s
->pkblob
, s
->pklen
);
4595 PUT_32BIT(s
->q
, s
->siglen
);
4597 /* Now the data to be signed... */
4598 PUT_32BIT(s
->q
, 20);
4600 memcpy(s
->q
, ssh
->v2_session_id
, 20);
4602 memcpy(s
->q
, ssh
->pktout
.data
+ 5,
4603 ssh
->pktout
.length
- 5);
4604 s
->q
+= ssh
->pktout
.length
- 5;
4605 /* And finally the (zero) flags word. */
4607 agent_query(s
->agentreq
, s
->len
+ 4, &vret
, &s
->retlen
);
4611 if (s
->ret
[4] == SSH2_AGENT_SIGN_RESPONSE
) {
4612 logevent("Sending Pageant's response");
4613 ssh2_add_sigblob(ssh
, s
->pkblob
, s
->pklen
,
4615 GET_32BIT(s
->ret
+ 5));
4621 ("Pageant failed to answer challenge");
4631 if (!s
->method
&& s
->can_pubkey
&& s
->publickey_blob
4632 && !s
->tried_pubkey_config
) {
4633 unsigned char *pub_blob
;
4634 char *algorithm
, *comment
;
4637 s
->tried_pubkey_config
= TRUE
;
4639 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4640 ssh
->pkt_ctx
|= SSH2_PKTCTX_PUBLICKEY
;
4643 * Try the public key supplied in the configuration.
4645 * First, offer the public blob to see if the server is
4646 * willing to accept it.
4648 pub_blob
= ssh2_userkey_loadpub(cfg
.keyfile
, &algorithm
,
4651 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4652 ssh2_pkt_addstring(ssh
, s
->username
);
4653 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4654 ssh2_pkt_addstring(ssh
, "publickey"); /* method */
4655 ssh2_pkt_addbool(ssh
, FALSE
); /* no signature included */
4656 ssh2_pkt_addstring(ssh
, algorithm
);
4657 ssh2_pkt_addstring_start(ssh
);
4658 ssh2_pkt_addstring_data(ssh
, pub_blob
, pub_blob_len
);
4660 logevent("Offered public key"); /* FIXME */
4662 crWaitUntilV(ispkt
);
4663 if (ssh
->pktin
.type
!= SSH2_MSG_USERAUTH_PK_OK
) {
4665 s
->type
= AUTH_TYPE_PUBLICKEY_OFFER_LOUD
;
4666 continue; /* key refused; give up on it */
4669 logevent("Offer of public key accepted");
4671 * Actually attempt a serious authentication using
4674 if (ssh2_userkey_encrypted(cfg
.keyfile
, &comment
)) {
4675 sprintf(s
->pwprompt
,
4676 "Passphrase for key \"%.100s\": ",
4682 c_write_str(ssh
, "Authenticating with public key \"");
4683 c_write_str(ssh
, comment
);
4684 c_write_str(ssh
, "\"\r\n");
4685 s
->method
= AUTH_PUBLICKEY_FILE
;
4689 if (!s
->method
&& s
->can_keyb_inter
&& !s
->tried_keyb_inter
) {
4690 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
4691 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
4692 s
->tried_keyb_inter
= TRUE
;
4694 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4695 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
4697 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4698 ssh2_pkt_addstring(ssh
, s
->username
);
4699 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4700 ssh2_pkt_addstring(ssh
, "keyboard-interactive"); /* method */
4701 ssh2_pkt_addstring(ssh
, ""); /* lang */
4702 ssh2_pkt_addstring(ssh
, "");
4705 crWaitUntilV(ispkt
);
4706 if (ssh
->pktin
.type
!= SSH2_MSG_USERAUTH_INFO_REQUEST
) {
4707 if (ssh
->pktin
.type
== SSH2_MSG_USERAUTH_FAILURE
)
4709 logevent("Keyboard-interactive authentication refused");
4710 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
;
4714 s
->kbd_inter_running
= TRUE
;
4718 if (s
->kbd_inter_running
) {
4719 s
->method
= AUTH_KEYBOARD_INTERACTIVE
;
4720 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
4721 s
->tried_keyb_inter
= TRUE
;
4723 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4724 ssh
->pkt_ctx
|= SSH2_PKTCTX_KBDINTER
;
4726 if (s
->curr_prompt
== 0) {
4728 * We've got a fresh USERAUTH_INFO_REQUEST.
4729 * Display header data, and start going through
4732 char *name
, *inst
, *lang
;
4733 int name_len
, inst_len
, lang_len
;
4735 ssh2_pkt_getstring(ssh
, &name
, &name_len
);
4736 ssh2_pkt_getstring(ssh
, &inst
, &inst_len
);
4737 ssh2_pkt_getstring(ssh
, &lang
, &lang_len
);
4739 c_write_untrusted(ssh
, name
, name_len
);
4740 c_write_str(ssh
, "\r\n");
4743 c_write_untrusted(ssh
, inst
, inst_len
);
4744 c_write_str(ssh
, "\r\n");
4746 s
->num_prompts
= ssh2_pkt_getuint32(ssh
);
4750 * If there are prompts remaining in the packet,
4751 * display one and get a response.
4753 if (s
->curr_prompt
< s
->num_prompts
) {
4757 ssh2_pkt_getstring(ssh
, &prompt
, &prompt_len
);
4758 if (prompt_len
> 0) {
4759 strncpy(s
->pwprompt
, prompt
, sizeof(s
->pwprompt
));
4760 s
->pwprompt
[prompt_len
< sizeof(s
->pwprompt
) ?
4761 prompt_len
: sizeof(s
->pwprompt
)-1] = '\0';
4764 "<server failed to send prompt>: ");
4766 s
->echo
= ssh2_pkt_getbool(ssh
);
4772 if (!s
->method
&& s
->can_passwd
) {
4773 s
->method
= AUTH_PASSWORD
;
4774 ssh
->pkt_ctx
&= ~SSH2_PKTCTX_AUTH_MASK
;
4775 ssh
->pkt_ctx
|= SSH2_PKTCTX_PASSWORD
;
4776 sprintf(s
->pwprompt
, "%.90s@%.90s's password: ", s
->username
,
4783 if (!ssh_get_line(s
->pwprompt
, s
->password
,
4784 sizeof(s
->password
), TRUE
)) {
4786 * get_line failed to get a password (for
4787 * example because one was supplied on the
4788 * command line which has already failed to
4791 ssh2_pkt_init(ssh
, SSH2_MSG_DISCONNECT
);
4792 ssh2_pkt_adduint32(ssh
,SSH2_DISCONNECT_BY_APPLICATION
);
4793 ssh2_pkt_addstring(ssh
, "No more passwords available"
4795 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
4797 logevent("Unable to authenticate");
4798 connection_fatal("Unable to authenticate");
4799 ssh
->state
= SSH_STATE_CLOSED
;
4803 int ret
; /* need not be saved across crReturn */
4804 c_write_untrusted(ssh
, s
->pwprompt
, strlen(s
->pwprompt
));
4807 setup_userpass_input(ssh
, s
->password
,
4808 sizeof(s
->password
), s
->echo
);
4810 crWaitUntilV(!ispkt
);
4811 ret
= process_userpass_input(ssh
, in
, inlen
);
4815 c_write_str(ssh
, "\r\n");
4819 if (s
->method
== AUTH_PUBLICKEY_FILE
) {
4821 * We have our passphrase. Now try the actual authentication.
4823 struct ssh2_userkey
*key
;
4825 key
= ssh2_load_userkey(cfg
.keyfile
, s
->password
);
4826 if (key
== SSH2_WRONG_PASSPHRASE
|| key
== NULL
) {
4827 if (key
== SSH2_WRONG_PASSPHRASE
) {
4828 c_write_str(ssh
, "Wrong passphrase\r\n");
4829 s
->tried_pubkey_config
= FALSE
;
4831 c_write_str(ssh
, "Unable to load private key\r\n");
4832 s
->tried_pubkey_config
= TRUE
;
4834 /* Send a spurious AUTH_NONE to return to the top. */
4835 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4836 ssh2_pkt_addstring(ssh
, s
->username
);
4837 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4838 ssh2_pkt_addstring(ssh
, "none"); /* method */
4840 s
->type
= AUTH_TYPE_NONE
;
4842 unsigned char *pkblob
, *sigblob
, *sigdata
;
4843 int pkblob_len
, sigblob_len
, sigdata_len
;
4846 * We have loaded the private key and the server
4847 * has announced that it's willing to accept it.
4848 * Hallelujah. Generate a signature and send it.
4850 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4851 ssh2_pkt_addstring(ssh
, s
->username
);
4852 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4853 ssh2_pkt_addstring(ssh
, "publickey"); /* method */
4854 ssh2_pkt_addbool(ssh
, TRUE
);
4855 ssh2_pkt_addstring(ssh
, key
->alg
->name
);
4856 pkblob
= key
->alg
->public_blob(key
->data
, &pkblob_len
);
4857 ssh2_pkt_addstring_start(ssh
);
4858 ssh2_pkt_addstring_data(ssh
, pkblob
, pkblob_len
);
4861 * The data to be signed is:
4865 * followed by everything so far placed in the
4868 sigdata_len
= ssh
->pktout
.length
- 5 + 4 + 20;
4869 sigdata
= smalloc(sigdata_len
);
4870 PUT_32BIT(sigdata
, 20);
4871 memcpy(sigdata
+ 4, ssh
->v2_session_id
, 20);
4872 memcpy(sigdata
+ 24, ssh
->pktout
.data
+ 5,
4873 ssh
->pktout
.length
- 5);
4874 sigblob
= key
->alg
->sign(key
->data
, sigdata
,
4875 sigdata_len
, &sigblob_len
);
4876 ssh2_add_sigblob(ssh
, pkblob
, pkblob_len
,
4877 sigblob
, sigblob_len
);
4883 s
->type
= AUTH_TYPE_PUBLICKEY
;
4885 } else if (s
->method
== AUTH_PASSWORD
) {
4887 * We send the password packet lumped tightly together with
4888 * an SSH_MSG_IGNORE packet. The IGNORE packet contains a
4889 * string long enough to make the total length of the two
4890 * packets constant. This should ensure that a passive
4891 * listener doing traffic analyis can't work out the length
4894 * For this to work, we need an assumption about the
4895 * maximum length of the password packet. I think 256 is
4896 * pretty conservative. Anyone using a password longer than
4897 * that probably doesn't have much to worry about from
4898 * people who find out how long their password is!
4900 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_REQUEST
);
4901 ssh2_pkt_addstring(ssh
, s
->username
);
4902 ssh2_pkt_addstring(ssh
, "ssh-connection"); /* service requested */
4903 ssh2_pkt_addstring(ssh
, "password");
4904 ssh2_pkt_addbool(ssh
, FALSE
);
4905 ssh2_pkt_addstring(ssh
, s
->password
);
4906 ssh2_pkt_defer(ssh
);
4908 * We'll include a string that's an exact multiple of the
4909 * cipher block size. If the cipher is NULL for some
4910 * reason, we don't do this trick at all because we gain
4913 if (ssh
->cscipher
) {
4916 stringlen
= (256 - ssh
->deferred_len
);
4917 stringlen
+= ssh
->cscipher
->blksize
- 1;
4918 stringlen
-= (stringlen
% ssh
->cscipher
->blksize
);
4921 * Temporarily disable actual compression,
4922 * so we can guarantee to get this string
4923 * exactly the length we want it. The
4924 * compression-disabling routine should
4925 * return an integer indicating how many
4926 * bytes we should adjust our string length
4929 stringlen
-= ssh
->cscomp
->disable_compression();
4931 ssh2_pkt_init(ssh
, SSH2_MSG_IGNORE
);
4932 ssh2_pkt_addstring_start(ssh
);
4933 for (i
= 0; i
< stringlen
; i
++) {
4934 char c
= (char) random_byte();
4935 ssh2_pkt_addstring_data(ssh
, &c
, 1);
4937 ssh2_pkt_defer(ssh
);
4939 ssh_pkt_defersend(ssh
);
4940 logevent("Sent password");
4941 s
->type
= AUTH_TYPE_PASSWORD
;
4942 } else if (s
->method
== AUTH_KEYBOARD_INTERACTIVE
) {
4943 if (s
->curr_prompt
== 0) {
4944 ssh2_pkt_init(ssh
, SSH2_MSG_USERAUTH_INFO_RESPONSE
);
4945 ssh2_pkt_adduint32(ssh
, s
->num_prompts
);
4947 if (s
->need_pw
) { /* only add pw if we just got one! */
4948 ssh2_pkt_addstring(ssh
, s
->password
);
4949 memset(s
->password
, 0, sizeof(s
->password
));
4952 if (s
->curr_prompt
>= s
->num_prompts
) {
4956 * If there are prompts remaining, we set
4957 * `gotit' so that we won't attempt to get
4958 * another packet. Then we go back round the
4959 * loop and will end up retrieving another
4960 * prompt out of the existing packet. Funky or
4965 s
->type
= AUTH_TYPE_KEYBOARD_INTERACTIVE
;
4967 c_write_str(ssh
, "No supported authentication methods"
4968 " left to try!\r\n");
4969 logevent("No supported authentications offered."
4971 ssh2_pkt_init(ssh
, SSH2_MSG_DISCONNECT
);
4972 ssh2_pkt_adduint32(ssh
, SSH2_DISCONNECT_BY_APPLICATION
);
4973 ssh2_pkt_addstring(ssh
, "No supported authentication"
4974 " methods available");
4975 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
4977 ssh
->state
= SSH_STATE_CLOSED
;
4981 } while (!s
->we_are_in
);
4984 * Now we're authenticated for the connection protocol. The
4985 * connection protocol will automatically have started at this
4986 * point; there's no need to send SERVICE_REQUEST.
4990 * So now create a channel with a session in it.
4992 ssh
->channels
= newtree234(ssh_channelcmp
);
4993 ssh
->mainchan
= smalloc(sizeof(struct ssh_channel
));
4994 ssh
->mainchan
->ssh
= ssh
;
4995 ssh
->mainchan
->localid
= alloc_channel_id(ssh
);
4996 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_OPEN
);
4997 ssh2_pkt_addstring(ssh
, "session");
4998 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->localid
);
4999 ssh
->mainchan
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
5000 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->v
.v2
.locwindow
);/* our window size */
5001 ssh2_pkt_adduint32(ssh
, 0x4000UL
); /* our max pkt size */
5003 crWaitUntilV(ispkt
);
5004 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
5005 bombout(("Server refused to open a session"));
5007 /* FIXME: error data comes back in FAILURE packet */
5009 if (ssh2_pkt_getuint32(ssh
) != ssh
->mainchan
->localid
) {
5010 bombout(("Server's channel confirmation cited wrong channel"));
5013 ssh
->mainchan
->remoteid
= ssh2_pkt_getuint32(ssh
);
5014 ssh
->mainchan
->type
= CHAN_MAINSESSION
;
5015 ssh
->mainchan
->closes
= 0;
5016 ssh
->mainchan
->v
.v2
.remwindow
= ssh2_pkt_getuint32(ssh
);
5017 ssh
->mainchan
->v
.v2
.remmaxpkt
= ssh2_pkt_getuint32(ssh
);
5018 bufchain_init(&ssh
->mainchan
->v
.v2
.outbuffer
);
5019 add234(ssh
->channels
, ssh
->mainchan
);
5020 logevent("Opened channel for session");
5023 * Potentially enable X11 forwarding.
5025 if (cfg
.x11_forward
) {
5026 char proto
[20], data
[64];
5027 logevent("Requesting X11 forwarding");
5028 x11_invent_auth(proto
, sizeof(proto
), data
, sizeof(data
));
5029 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5030 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
5031 ssh2_pkt_addstring(ssh
, "x11-req");
5032 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5033 ssh2_pkt_addbool(ssh
, 0); /* many connections */
5034 ssh2_pkt_addstring(ssh
, proto
);
5035 ssh2_pkt_addstring(ssh
, data
);
5036 ssh2_pkt_adduint32(ssh
, 0); /* screen number */
5040 crWaitUntilV(ispkt
);
5041 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5042 unsigned i
= ssh2_pkt_getuint32(ssh
);
5043 struct ssh_channel
*c
;
5044 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5046 continue; /* nonexistent channel */
5047 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5049 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5051 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
5052 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
5053 bombout(("Unexpected response to X11 forwarding request:"
5054 " packet type %d", ssh
->pktin
.type
));
5057 logevent("X11 forwarding refused");
5059 logevent("X11 forwarding enabled");
5060 ssh
->X11_fwd_enabled
= TRUE
;
5065 * Enable port forwardings.
5070 int sport
,dport
,sserv
,dserv
;
5071 char sports
[256], dports
[256], host
[256];
5075 ssh
->rportfwds
= newtree234(ssh_rportcmp_ssh2
);
5076 /* Add port forwardings. */
5077 ssh
->portfwd_strptr
= cfg
.portfwd
;
5078 while (*ssh
->portfwd_strptr
) {
5079 type
= *ssh
->portfwd_strptr
++;
5081 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= '\t')
5082 sports
[n
++] = *ssh
->portfwd_strptr
++;
5084 if (*ssh
->portfwd_strptr
== '\t')
5085 ssh
->portfwd_strptr
++;
5087 while (*ssh
->portfwd_strptr
&& *ssh
->portfwd_strptr
!= ':')
5088 host
[n
++] = *ssh
->portfwd_strptr
++;
5090 if (*ssh
->portfwd_strptr
== ':')
5091 ssh
->portfwd_strptr
++;
5093 while (*ssh
->portfwd_strptr
)
5094 dports
[n
++] = *ssh
->portfwd_strptr
++;
5096 ssh
->portfwd_strptr
++;
5097 dport
= atoi(dports
);
5101 se
= getservbyname(dports
, NULL
);
5103 dport
= ntohs(se
->s_port
);
5106 "Service lookup failed for destination port \"%s\"",
5111 sport
= atoi(sports
);
5115 se
= getservbyname(sports
, NULL
);
5117 sport
= ntohs(se
->s_port
);
5120 "Service lookup failed for source port \"%s\"",
5125 if (sport
&& dport
) {
5127 pfd_addforward(host
, dport
, sport
);
5128 sprintf(buf
, "Local port %.*s%.*s%d%.*s forwarding to"
5129 " %s:%.*s%.*s%d%.*s",
5130 sserv ?
strlen(sports
) : 0, sports
,
5131 sserv
, "(", sport
, sserv
, ")",
5133 dserv ?
strlen(dports
) : 0, dports
,
5134 dserv
, "(", dport
, dserv
, ")");
5137 struct ssh_rportfwd
*pf
;
5138 pf
= smalloc(sizeof(*pf
));
5139 strcpy(pf
->dhost
, host
);
5142 if (add234(ssh
->rportfwds
, pf
) != pf
) {
5144 "Duplicate remote port forwarding to %s:%d",
5149 sprintf(buf
, "Requesting remote port %.*s%.*s%d%.*s"
5150 " forward to %s:%.*s%.*s%d%.*s",
5151 sserv ?
strlen(sports
) : 0, sports
,
5152 sserv
, "(", sport
, sserv
, ")",
5154 dserv ?
strlen(dports
) : 0, dports
,
5155 dserv
, "(", dport
, dserv
, ")");
5157 ssh2_pkt_init(ssh
, SSH2_MSG_GLOBAL_REQUEST
);
5158 ssh2_pkt_addstring(ssh
, "tcpip-forward");
5159 ssh2_pkt_addbool(ssh
, 1);/* want reply */
5160 if (cfg
.rport_acceptall
)
5161 ssh2_pkt_addstring(ssh
, "0.0.0.0");
5163 ssh2_pkt_addstring(ssh
, "127.0.0.1");
5164 ssh2_pkt_adduint32(ssh
, sport
);
5168 crWaitUntilV(ispkt
);
5169 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5170 unsigned i
= ssh2_pkt_getuint32(ssh
);
5171 struct ssh_channel
*c
;
5172 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5174 continue;/* nonexistent channel */
5175 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5177 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5179 if (ssh
->pktin
.type
!= SSH2_MSG_REQUEST_SUCCESS
) {
5180 if (ssh
->pktin
.type
!= SSH2_MSG_REQUEST_FAILURE
) {
5181 bombout(("Unexpected response to port "
5182 "forwarding request: packet type %d",
5186 logevent("Server refused this port forwarding");
5188 logevent("Remote port forwarding enabled");
5197 * Potentially enable agent forwarding.
5199 if (cfg
.agentfwd
&& agent_exists()) {
5200 logevent("Requesting OpenSSH-style agent forwarding");
5201 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5202 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
5203 ssh2_pkt_addstring(ssh
, "auth-agent-req@openssh.com");
5204 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5208 crWaitUntilV(ispkt
);
5209 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5210 unsigned i
= ssh2_pkt_getuint32(ssh
);
5211 struct ssh_channel
*c
;
5212 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5214 continue; /* nonexistent channel */
5215 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5217 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5219 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
5220 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
5221 bombout(("Unexpected response to agent forwarding request:"
5222 " packet type %d", ssh
->pktin
.type
));
5225 logevent("Agent forwarding refused");
5227 logevent("Agent forwarding enabled");
5228 ssh
->agentfwd_enabled
= TRUE
;
5233 * Now allocate a pty for the session.
5236 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5237 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
); /* recipient channel */
5238 ssh2_pkt_addstring(ssh
, "pty-req");
5239 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5240 ssh2_pkt_addstring(ssh
, cfg
.termtype
);
5241 ssh2_pkt_adduint32(ssh
, ssh
->term_width
);
5242 ssh2_pkt_adduint32(ssh
, ssh
->term_height
);
5243 ssh2_pkt_adduint32(ssh
, 0); /* pixel width */
5244 ssh2_pkt_adduint32(ssh
, 0); /* pixel height */
5245 ssh2_pkt_addstring_start(ssh
);
5246 ssh2_pkt_addstring_data(ssh
, "\0", 1); /* TTY_OP_END, no special options */
5248 ssh
->state
= SSH_STATE_INTERMED
;
5251 crWaitUntilV(ispkt
);
5252 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5253 unsigned i
= ssh2_pkt_getuint32(ssh
);
5254 struct ssh_channel
*c
;
5255 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5257 continue; /* nonexistent channel */
5258 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5260 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5262 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
5263 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
5264 bombout(("Unexpected response to pty request:"
5265 " packet type %d", ssh
->pktin
.type
));
5268 c_write_str(ssh
, "Server refused to allocate pty\r\n");
5269 ssh
->editing
= ssh
->echoing
= 1;
5271 logevent("Allocated pty");
5274 ssh
->editing
= ssh
->echoing
= 1;
5278 * Start a shell or a remote command. We may have to attempt
5279 * this twice if the config data has provided a second choice
5286 if (ssh
->fallback_cmd
) {
5287 subsys
= cfg
.ssh_subsys2
;
5288 cmd
= cfg
.remote_cmd_ptr2
;
5290 subsys
= cfg
.ssh_subsys
;
5291 cmd
= cfg
.remote_cmd_ptr
;
5294 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5295 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
); /* recipient channel */
5297 ssh2_pkt_addstring(ssh
, "subsystem");
5298 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5299 ssh2_pkt_addstring(ssh
, cmd
);
5301 ssh2_pkt_addstring(ssh
, "exec");
5302 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5303 ssh2_pkt_addstring(ssh
, cmd
);
5305 ssh2_pkt_addstring(ssh
, "shell");
5306 ssh2_pkt_addbool(ssh
, 1); /* want reply */
5310 crWaitUntilV(ispkt
);
5311 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5312 unsigned i
= ssh2_pkt_getuint32(ssh
);
5313 struct ssh_channel
*c
;
5314 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5316 continue; /* nonexistent channel */
5317 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5319 } while (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
5320 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
5321 if (ssh
->pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
5322 bombout(("Unexpected response to shell/command request:"
5323 " packet type %d", ssh
->pktin
.type
));
5327 * We failed to start the command. If this is the
5328 * fallback command, we really are finished; if it's
5329 * not, and if the fallback command exists, try falling
5330 * back to it before complaining.
5332 if (!ssh
->fallback_cmd
&& cfg
.remote_cmd_ptr2
!= NULL
) {
5333 logevent("Primary command failed; attempting fallback");
5334 ssh
->fallback_cmd
= TRUE
;
5337 bombout(("Server refused to start a shell/command"));
5340 logevent("Started a shell/command");
5345 ssh
->state
= SSH_STATE_SESSION
;
5346 if (ssh
->size_needed
)
5347 ssh_size(ssh
, ssh
->term_width
, ssh
->term_height
);
5348 if (ssh
->eof_needed
)
5349 ssh_special(ssh
, TS_EOF
);
5354 ldisc_send(NULL
, 0, 0); /* cause ldisc to notice changes */
5358 s
->try_send
= FALSE
;
5360 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_DATA
||
5361 ssh
->pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
) {
5364 unsigned i
= ssh2_pkt_getuint32(ssh
);
5365 struct ssh_channel
*c
;
5366 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5368 continue; /* nonexistent channel */
5369 if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
&&
5370 ssh2_pkt_getuint32(ssh
) != SSH2_EXTENDED_DATA_STDERR
)
5371 continue; /* extended but not stderr */
5372 ssh2_pkt_getstring(ssh
, &data
, &length
);
5375 c
->v
.v2
.locwindow
-= length
;
5377 case CHAN_MAINSESSION
:
5379 from_backend(ssh
->frontend
, ssh
->pktin
.type
==
5380 SSH2_MSG_CHANNEL_EXTENDED_DATA
,
5384 bufsize
= x11_send(c
->u
.x11
.s
, data
, length
);
5387 bufsize
= pfd_send(c
->u
.pfd
.s
, data
, length
);
5390 while (length
> 0) {
5391 if (c
->u
.a
.lensofar
< 4) {
5392 int l
= min(4 - c
->u
.a
.lensofar
, length
);
5393 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
,
5397 c
->u
.a
.lensofar
+= l
;
5399 if (c
->u
.a
.lensofar
== 4) {
5401 4 + GET_32BIT(c
->u
.a
.msglen
);
5402 c
->u
.a
.message
= smalloc(c
->u
.a
.totallen
);
5403 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
5405 if (c
->u
.a
.lensofar
>= 4 && length
> 0) {
5407 min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
,
5409 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
,
5413 c
->u
.a
.lensofar
+= l
;
5415 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
5416 void *reply
, *sentreply
;
5418 agent_query(c
->u
.a
.message
,
5419 c
->u
.a
.totallen
, &reply
,
5424 /* Fake SSH_AGENT_FAILURE. */
5425 sentreply
= "\0\0\0\1\5";
5428 ssh2_add_channel_data(c
, sentreply
, replylen
);
5432 sfree(c
->u
.a
.message
);
5433 c
->u
.a
.lensofar
= 0;
5440 * If we are not buffering too much data,
5441 * enlarge the window again at the remote side.
5443 if (bufsize
< OUR_V2_WINSIZE
)
5444 ssh2_set_window(c
, OUR_V2_WINSIZE
- bufsize
);
5446 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_EOF
) {
5447 unsigned i
= ssh2_pkt_getuint32(ssh
);
5448 struct ssh_channel
*c
;
5450 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5452 continue; /* nonexistent channel */
5454 if (c
->type
== CHAN_X11
) {
5456 * Remote EOF on an X11 channel means we should
5457 * wrap up and close the channel ourselves.
5459 x11_close(c
->u
.x11
.s
);
5461 } else if (c
->type
== CHAN_AGENT
) {
5463 } else if (c
->type
== CHAN_SOCKDATA
) {
5464 pfd_close(c
->u
.pfd
.s
);
5467 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_CLOSE
) {
5468 unsigned i
= ssh2_pkt_getuint32(ssh
);
5469 struct ssh_channel
*c
;
5471 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5472 if (!c
|| ((int)c
->remoteid
) == -1) {
5473 bombout(("Received CHANNEL_CLOSE for %s channel %d\n",
5474 c ?
"half-open" : "nonexistent", i
));
5476 /* Do pre-close processing on the channel. */
5478 case CHAN_MAINSESSION
:
5479 break; /* nothing to see here, move along */
5481 if (c
->u
.x11
.s
!= NULL
)
5482 x11_close(c
->u
.x11
.s
);
5489 if (c
->u
.pfd
.s
!= NULL
)
5490 pfd_close(c
->u
.pfd
.s
);
5494 if (c
->closes
== 0) {
5495 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_CLOSE
);
5496 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
5499 del234(ssh
->channels
, c
);
5500 bufchain_clear(&c
->v
.v2
.outbuffer
);
5504 * See if that was the last channel left open.
5506 if (count234(ssh
->channels
) == 0) {
5509 * We used to send SSH_MSG_DISCONNECT here,
5510 * because I'd believed that _every_ conforming
5511 * SSH2 connection had to end with a disconnect
5512 * being sent by at least one side; apparently
5513 * I was wrong and it's perfectly OK to
5514 * unceremoniously slam the connection shut
5515 * when you're done, and indeed OpenSSH feels
5516 * this is more polite than sending a
5517 * DISCONNECT. So now we don't.
5519 logevent("All channels closed. Disconnecting");
5520 ssh2_pkt_init(ssh
, SSH2_MSG_DISCONNECT
);
5521 ssh2_pkt_adduint32(ssh
, SSH2_DISCONNECT_BY_APPLICATION
);
5522 ssh2_pkt_addstring(ssh
, "All open channels closed");
5523 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
5526 ssh
->state
= SSH_STATE_CLOSED
;
5529 continue; /* remote sends close; ignore (FIXME) */
5530 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
5531 unsigned i
= ssh2_pkt_getuint32(ssh
);
5532 struct ssh_channel
*c
;
5533 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5535 continue; /* nonexistent channel */
5536 c
->v
.v2
.remwindow
+= ssh2_pkt_getuint32(ssh
);
5538 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
5539 unsigned i
= ssh2_pkt_getuint32(ssh
);
5540 struct ssh_channel
*c
;
5541 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5543 continue; /* nonexistent channel */
5544 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
5545 continue; /* dunno why they're confirming this */
5546 c
->remoteid
= ssh2_pkt_getuint32(ssh
);
5547 c
->type
= CHAN_SOCKDATA
;
5548 c
->v
.v2
.remwindow
= ssh2_pkt_getuint32(ssh
);
5549 c
->v
.v2
.remmaxpkt
= ssh2_pkt_getuint32(ssh
);
5551 pfd_confirm(c
->u
.pfd
.s
);
5554 * We have a pending close on this channel,
5555 * which we decided on before the server acked
5556 * the channel open. So now we know the
5557 * remoteid, we can close it again.
5559 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_CLOSE
);
5560 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
5563 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_OPEN_FAILURE
) {
5564 unsigned i
= ssh2_pkt_getuint32(ssh
);
5565 struct ssh_channel
*c
;
5566 c
= find234(ssh
->channels
, &i
, ssh_channelfind
);
5568 continue; /* nonexistent channel */
5569 if (c
->type
!= CHAN_SOCKDATA_DORMANT
)
5570 continue; /* dunno why they're failing this */
5572 logevent("Forwarded connection refused by server");
5574 pfd_close(c
->u
.pfd
.s
);
5576 del234(ssh
->channels
, c
);
5578 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_REQUEST
) {
5581 int typelen
, want_reply
;
5582 struct ssh_channel
*c
;
5584 localid
= ssh2_pkt_getuint32(ssh
);
5585 ssh2_pkt_getstring(ssh
, &type
, &typelen
);
5586 want_reply
= ssh2_pkt_getbool(ssh
);
5589 * First, check that the channel exists. Otherwise,
5590 * we can instantly disconnect with a rude message.
5592 c
= find234(ssh
->channels
, &localid
, ssh_channelfind
);
5595 sprintf(buf
, "Received channel request for nonexistent"
5596 " channel %d", localid
);
5598 ssh2_pkt_init(ssh
, SSH2_MSG_DISCONNECT
);
5599 ssh2_pkt_adduint32(ssh
, SSH2_DISCONNECT_BY_APPLICATION
);
5600 ssh2_pkt_addstring(ssh
, buf
);
5601 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
5603 connection_fatal("%s", buf
);
5604 ssh
->state
= SSH_STATE_CLOSED
;
5609 * Having got the channel number, we now look at
5610 * the request type string to see if it's something
5613 if (typelen
== 11 && !memcmp(type
, "exit-status", 11) &&
5614 c
== ssh
->mainchan
) {
5615 /* We recognise "exit-status" on the primary channel. */
5617 ssh
->exitcode
= ssh2_pkt_getuint32(ssh
);
5618 sprintf(buf
, "Server sent command exit status %d",
5622 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_SUCCESS
);
5623 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
5628 * This is a channel request we don't know
5629 * about, so we now either ignore the request
5630 * or respond with CHANNEL_FAILURE, depending
5634 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_FAILURE
);
5635 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
5639 } else if (ssh
->pktin
.type
== SSH2_MSG_GLOBAL_REQUEST
) {
5641 int typelen
, want_reply
;
5643 ssh2_pkt_getstring(ssh
, &type
, &typelen
);
5644 want_reply
= ssh2_pkt_getbool(ssh
);
5647 * We currently don't support any global requests
5648 * at all, so we either ignore the request or
5649 * respond with REQUEST_FAILURE, depending on
5653 ssh2_pkt_init(ssh
, SSH2_MSG_REQUEST_FAILURE
);
5656 } else if (ssh
->pktin
.type
== SSH2_MSG_CHANNEL_OPEN
) {
5660 struct ssh_channel
*c
;
5661 unsigned remid
, winsize
, pktsize
;
5662 ssh2_pkt_getstring(ssh
, &type
, &typelen
);
5663 c
= smalloc(sizeof(struct ssh_channel
));
5666 remid
= ssh2_pkt_getuint32(ssh
);
5667 winsize
= ssh2_pkt_getuint32(ssh
);
5668 pktsize
= ssh2_pkt_getuint32(ssh
);
5670 if (typelen
== 3 && !memcmp(type
, "x11", 3)) {
5671 if (!ssh
->X11_fwd_enabled
)
5672 error
= "X11 forwarding is not enabled";
5673 else if (x11_init(&c
->u
.x11
.s
, cfg
.x11_display
, c
) !=
5675 error
= "Unable to open an X11 connection";
5679 } else if (typelen
== 15 &&
5680 !memcmp(type
, "forwarded-tcpip", 15)) {
5681 struct ssh_rportfwd pf
, *realpf
;
5684 ssh2_pkt_getstring(ssh
, &dummy
, &dummylen
);/* skip address */
5685 pf
.sport
= ssh2_pkt_getuint32(ssh
);
5686 realpf
= find234(ssh
->rportfwds
, &pf
, NULL
);
5687 if (realpf
== NULL
) {
5688 error
= "Remote port is not recognised";
5690 char *e
= pfd_newconnect(&c
->u
.pfd
.s
, realpf
->dhost
,
5693 sprintf(buf
, "Received remote port open request for %s:%d",
5694 realpf
->dhost
, realpf
->dport
);
5697 sprintf(buf
, "Port open failed: %s", e
);
5699 error
= "Port open failed";
5701 logevent("Forwarded port opened successfully");
5702 c
->type
= CHAN_SOCKDATA
;
5705 } else if (typelen
== 22 &&
5706 !memcmp(type
, "auth-agent@openssh.com", 3)) {
5707 if (!ssh
->agentfwd_enabled
)
5708 error
= "Agent forwarding is not enabled";
5710 c
->type
= CHAN_AGENT
; /* identify channel type */
5711 c
->u
.a
.lensofar
= 0;
5714 error
= "Unsupported channel type requested";
5717 c
->remoteid
= remid
;
5719 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_OPEN_FAILURE
);
5720 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
5721 ssh2_pkt_adduint32(ssh
, SSH2_OPEN_CONNECT_FAILED
);
5722 ssh2_pkt_addstring(ssh
, error
);
5723 ssh2_pkt_addstring(ssh
, "en"); /* language tag */
5727 c
->localid
= alloc_channel_id(ssh
);
5729 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
5730 c
->v
.v2
.remwindow
= winsize
;
5731 c
->v
.v2
.remmaxpkt
= pktsize
;
5732 bufchain_init(&c
->v
.v2
.outbuffer
);
5733 add234(ssh
->channels
, c
);
5734 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
);
5735 ssh2_pkt_adduint32(ssh
, c
->remoteid
);
5736 ssh2_pkt_adduint32(ssh
, c
->localid
);
5737 ssh2_pkt_adduint32(ssh
, c
->v
.v2
.locwindow
);
5738 ssh2_pkt_adduint32(ssh
, 0x4000UL
); /* our max pkt size */
5742 bombout(("Strange packet received: type %d", ssh
->pktin
.type
));
5747 * We have spare data. Add it to the channel buffer.
5749 ssh2_add_channel_data(ssh
->mainchan
, in
, inlen
);
5754 struct ssh_channel
*c
;
5756 * Try to send data on all channels if we can.
5758 for (i
= 0; NULL
!= (c
= index234(ssh
->channels
, i
)); i
++) {
5759 int bufsize
= ssh2_try_send(c
);
5762 case CHAN_MAINSESSION
:
5763 /* stdin need not receive an unthrottle
5764 * notification since it will be polled */
5767 x11_unthrottle(c
->u
.x11
.s
);
5770 /* agent sockets are request/response and need no
5771 * buffer management */
5774 pfd_unthrottle(c
->u
.pfd
.s
);
5786 * Handle the top-level SSH2 protocol.
5788 static void ssh2_protocol(Ssh ssh
, unsigned char *in
, int inlen
, int ispkt
)
5790 if (do_ssh2_transport(ssh
, in
, inlen
, ispkt
) == 0)
5792 do_ssh2_authconn(ssh
, in
, inlen
, ispkt
);
5796 * Called to set up the connection.
5798 * Returns an error message, or NULL on success.
5800 static char *ssh_init(void *frontend_handle
, void **backend_handle
,
5801 char *host
, int port
, char **realhost
, int nodelay
)
5806 ssh
= smalloc(sizeof(*ssh
));
5809 ssh
->v1_cipher_ctx
= NULL
;
5810 ssh
->crcda_ctx
= NULL
;
5811 ssh
->cscipher
= NULL
;
5812 ssh
->cs_cipher_ctx
= NULL
;
5813 ssh
->sccipher
= NULL
;
5814 ssh
->sc_cipher_ctx
= NULL
;
5816 ssh
->sc_mac_ctx
= NULL
;
5818 ssh
->sc_mac_ctx
= NULL
;
5822 ssh
->hostkey
= NULL
;
5824 ssh
->state
= SSH_STATE_PREPACKET
;
5825 ssh
->size_needed
= FALSE
;
5826 ssh
->eof_needed
= FALSE
;
5828 static const struct Packet empty
= { 0, 0, NULL
, NULL
, 0 };
5829 ssh
->pktin
= ssh
->pktout
= empty
;
5831 ssh
->deferred_send_data
= NULL
;
5832 ssh
->deferred_len
= 0;
5833 ssh
->deferred_size
= 0;
5834 ssh
->fallback_cmd
= 0;
5836 ssh
->v2_outgoing_sequence
= 0;
5837 ssh
->ssh1_rdpkt_crstate
= 0;
5838 ssh
->ssh2_rdpkt_crstate
= 0;
5839 ssh
->do_ssh_init_crstate
= 0;
5840 ssh
->ssh_gotdata_crstate
= 0;
5841 ssh
->ssh1_protocol_crstate
= 0;
5842 ssh
->do_ssh1_login_crstate
= 0;
5843 ssh
->do_ssh2_transport_crstate
= 0;
5844 ssh
->do_ssh2_authconn_crstate
= 0;
5845 ssh
->do_ssh_init_state
= NULL
;
5846 ssh
->do_ssh1_login_state
= NULL
;
5847 ssh
->do_ssh2_transport_state
= NULL
;
5848 ssh
->do_ssh2_authconn_state
= NULL
;
5850 *backend_handle
= ssh
;
5853 if (crypto_startup() == 0)
5854 return "Microsoft high encryption pack not installed!";
5857 ssh
->frontend
= frontend_handle
;
5858 ssh
->term_width
= cfg
.width
;
5859 ssh
->term_height
= cfg
.height
;
5864 ssh
->v1_throttle_count
= 0;
5865 ssh
->overall_bufsize
= 0;
5866 ssh
->fallback_cmd
= 0;
5868 p
= connect_to_host(ssh
, host
, port
, realhost
, nodelay
);
5876 * Called to send data down the Telnet connection.
5878 static int ssh_send(void *handle
, char *buf
, int len
)
5880 Ssh ssh
= (Ssh
) handle
;
5882 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
5885 ssh
->protocol(ssh
, buf
, len
, 0);
5887 return ssh_sendbuffer(ssh
);
5891 * Called to query the current amount of buffered stdin data.
5893 static int ssh_sendbuffer(void *handle
)
5895 Ssh ssh
= (Ssh
) handle
;
5898 if (ssh
== NULL
|| ssh
->s
== NULL
|| ssh
->protocol
== NULL
)
5902 * If the SSH socket itself has backed up, add the total backup
5903 * size on that to any individual buffer on the stdin channel.
5906 if (ssh
->throttled_all
)
5907 override_value
= ssh
->overall_bufsize
;
5909 if (ssh
->version
== 1) {
5910 return override_value
;
5911 } else if (ssh
->version
== 2) {
5912 if (!ssh
->mainchan
|| ssh
->mainchan
->closes
> 0)
5913 return override_value
;
5915 return (override_value
+
5916 bufchain_size(&ssh
->mainchan
->v
.v2
.outbuffer
));
5923 * Called to set the size of the window from SSH's POV.
5925 static void ssh_size(void *handle
, int width
, int height
)
5927 Ssh ssh
= (Ssh
) handle
;
5929 ssh
->term_width
= width
;
5930 ssh
->term_height
= height
;
5932 switch (ssh
->state
) {
5933 case SSH_STATE_BEFORE_SIZE
:
5934 case SSH_STATE_PREPACKET
:
5935 case SSH_STATE_CLOSED
:
5936 break; /* do nothing */
5937 case SSH_STATE_INTERMED
:
5938 ssh
->size_needed
= TRUE
; /* buffer for later */
5940 case SSH_STATE_SESSION
:
5944 if (ssh
->version
== 1) {
5945 send_packet(ssh
, SSH1_CMSG_WINDOW_SIZE
,
5946 PKT_INT
, ssh
->term_height
,
5947 PKT_INT
, ssh
->term_width
,
5948 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
5950 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_REQUEST
);
5951 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
5952 ssh2_pkt_addstring(ssh
, "window-change");
5953 ssh2_pkt_addbool(ssh
, 0);
5954 ssh2_pkt_adduint32(ssh
, ssh
->term_width
);
5955 ssh2_pkt_adduint32(ssh
, ssh
->term_height
);
5956 ssh2_pkt_adduint32(ssh
, 0);
5957 ssh2_pkt_adduint32(ssh
, 0);
5966 * Send Telnet special codes. TS_EOF is useful for `plink', so you
5967 * can send an EOF and collect resulting output (e.g. `plink
5970 static void ssh_special(void *handle
, Telnet_Special code
)
5972 Ssh ssh
= (Ssh
) handle
;
5974 if (code
== TS_EOF
) {
5975 if (ssh
->state
!= SSH_STATE_SESSION
) {
5977 * Buffer the EOF in case we are pre-SESSION, so we can
5978 * send it as soon as we reach SESSION.
5981 ssh
->eof_needed
= TRUE
;
5984 if (ssh
->version
== 1) {
5985 send_packet(ssh
, SSH1_CMSG_EOF
, PKT_END
);
5987 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_EOF
);
5988 ssh2_pkt_adduint32(ssh
, ssh
->mainchan
->remoteid
);
5991 logevent("Sent EOF message");
5992 } else if (code
== TS_PING
) {
5993 if (ssh
->state
== SSH_STATE_CLOSED
5994 || ssh
->state
== SSH_STATE_PREPACKET
) return;
5995 if (ssh
->version
== 1) {
5996 if (!(ssh
->remote_bugs
& BUG_CHOKES_ON_SSH1_IGNORE
))
5997 send_packet(ssh
, SSH1_MSG_IGNORE
, PKT_STR
, "", PKT_END
);
5999 ssh2_pkt_init(ssh
, SSH2_MSG_IGNORE
);
6000 ssh2_pkt_addstring_start(ssh
);
6008 void *new_sock_channel(void *handle
, Socket s
)
6010 Ssh ssh
= (Ssh
) handle
;
6011 struct ssh_channel
*c
;
6012 c
= smalloc(sizeof(struct ssh_channel
));
6016 c
->remoteid
= -1; /* to be set when open confirmed */
6017 c
->localid
= alloc_channel_id(ssh
);
6019 c
->type
= CHAN_SOCKDATA_DORMANT
;/* identify channel type */
6021 bufchain_init(&c
->v
.v2
.outbuffer
);
6022 add234(ssh
->channels
, c
);
6028 * This is called when stdout/stderr (the entity to which
6029 * from_backend sends data) manages to clear some backlog.
6031 void ssh_unthrottle(void *handle
, int bufsize
)
6033 Ssh ssh
= (Ssh
) handle
;
6034 if (ssh
->version
== 1) {
6035 if (ssh
->v1_stdout_throttling
&& bufsize
< SSH1_BUFFER_LIMIT
) {
6036 ssh
->v1_stdout_throttling
= 0;
6037 ssh1_throttle(ssh
, -1);
6040 if (ssh
->mainchan
&& ssh
->mainchan
->closes
== 0)
6041 ssh2_set_window(ssh
->mainchan
, OUR_V2_WINSIZE
- bufsize
);
6045 void ssh_send_port_open(void *handle
, void *channel
, char *hostname
,
6046 int port
, char *org
)
6048 Ssh ssh
= (Ssh
) handle
;
6049 struct ssh_channel
*c
= (struct ssh_channel
*)channel
;
6052 sprintf(buf
, "Opening forwarded connection to %.512s:%d", hostname
, port
);
6055 if (ssh
->version
== 1) {
6056 send_packet(ssh
, SSH1_MSG_PORT_OPEN
,
6057 PKT_INT
, c
->localid
,
6060 //PKT_STR, <org:orgport>,
6063 ssh2_pkt_init(ssh
, SSH2_MSG_CHANNEL_OPEN
);
6064 ssh2_pkt_addstring(ssh
, "direct-tcpip");
6065 ssh2_pkt_adduint32(ssh
, c
->localid
);
6066 c
->v
.v2
.locwindow
= OUR_V2_WINSIZE
;
6067 ssh2_pkt_adduint32(ssh
, c
->v
.v2
.locwindow
);/* our window size */
6068 ssh2_pkt_adduint32(ssh
, 0x4000UL
); /* our max pkt size */
6069 ssh2_pkt_addstring(ssh
, hostname
);
6070 ssh2_pkt_adduint32(ssh
, port
);
6072 * We make up values for the originator data; partly it's
6073 * too much hassle to keep track, and partly I'm not
6074 * convinced the server should be told details like that
6075 * about my local network configuration.
6077 ssh2_pkt_addstring(ssh
, "client-side-connection");
6078 ssh2_pkt_adduint32(ssh
, 0);
6084 static Socket
ssh_socket(void *handle
)
6086 Ssh ssh
= (Ssh
) handle
;
6090 static int ssh_sendok(void *handle
)
6092 Ssh ssh
= (Ssh
) handle
;
6093 return ssh
->send_ok
;
6096 static int ssh_ldisc(void *handle
, int option
)
6098 Ssh ssh
= (Ssh
) handle
;
6099 if (option
== LD_ECHO
)
6100 return ssh
->echoing
;
6101 if (option
== LD_EDIT
)
6102 return ssh
->editing
;
6106 static int ssh_return_exitcode(void *handle
)
6108 Ssh ssh
= (Ssh
) handle
;
6109 return ssh
->exitcode
;
6113 * Gross hack: pscp will try to start SFTP but fall back to scp1 if
6114 * that fails. This variable is the means by which scp.c can reach
6115 * into the SSH code and find out which one it got.
6117 extern int ssh_fallback_cmd(void *handle
)
6119 Ssh ssh
= (Ssh
) handle
;
6120 return ssh
->fallback_cmd
;
6123 Backend ssh_backend
= {
6130 ssh_return_exitcode
,