18 #define logevent(s) { logevent(s); \
19 if ((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)) \
20 fprintf(stderr, "%s\n", s); }
22 #define bombout(msg) ( ssh_state = SSH_STATE_CLOSED, sk_close(s), \
23 s = NULL, connection_fatal msg )
25 #define SSH1_MSG_DISCONNECT 1 /* 0x1 */
26 #define SSH1_SMSG_PUBLIC_KEY 2 /* 0x2 */
27 #define SSH1_CMSG_SESSION_KEY 3 /* 0x3 */
28 #define SSH1_CMSG_USER 4 /* 0x4 */
29 #define SSH1_CMSG_AUTH_RSA 6 /* 0x6 */
30 #define SSH1_SMSG_AUTH_RSA_CHALLENGE 7 /* 0x7 */
31 #define SSH1_CMSG_AUTH_RSA_RESPONSE 8 /* 0x8 */
32 #define SSH1_CMSG_AUTH_PASSWORD 9 /* 0x9 */
33 #define SSH1_CMSG_REQUEST_PTY 10 /* 0xa */
34 #define SSH1_CMSG_WINDOW_SIZE 11 /* 0xb */
35 #define SSH1_CMSG_EXEC_SHELL 12 /* 0xc */
36 #define SSH1_CMSG_EXEC_CMD 13 /* 0xd */
37 #define SSH1_SMSG_SUCCESS 14 /* 0xe */
38 #define SSH1_SMSG_FAILURE 15 /* 0xf */
39 #define SSH1_CMSG_STDIN_DATA 16 /* 0x10 */
40 #define SSH1_SMSG_STDOUT_DATA 17 /* 0x11 */
41 #define SSH1_SMSG_STDERR_DATA 18 /* 0x12 */
42 #define SSH1_CMSG_EOF 19 /* 0x13 */
43 #define SSH1_SMSG_EXIT_STATUS 20 /* 0x14 */
44 #define SSH1_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* 0x15 */
45 #define SSH1_MSG_CHANNEL_OPEN_FAILURE 22 /* 0x16 */
46 #define SSH1_MSG_CHANNEL_DATA 23 /* 0x17 */
47 #define SSH1_MSG_CHANNEL_CLOSE 24 /* 0x18 */
48 #define SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* 0x19 */
49 #define SSH1_SMSG_X11_OPEN 27 /* 0x1b */
50 #define SSH1_CMSG_PORT_FORWARD_REQUEST 28 /* 0x1c */
51 #define SSH1_MSG_PORT_OPEN 29 /* 0x1d */
52 #define SSH1_CMSG_AGENT_REQUEST_FORWARDING 30 /* 0x1e */
53 #define SSH1_SMSG_AGENT_OPEN 31 /* 0x1f */
54 #define SSH1_MSG_IGNORE 32 /* 0x20 */
55 #define SSH1_CMSG_EXIT_CONFIRMATION 33 /* 0x21 */
56 #define SSH1_CMSG_X11_REQUEST_FORWARDING 34 /* 0x22 */
57 #define SSH1_CMSG_AUTH_RHOSTS_RSA 35 /* 0x23 */
58 #define SSH1_MSG_DEBUG 36 /* 0x24 */
59 #define SSH1_CMSG_REQUEST_COMPRESSION 37 /* 0x25 */
60 #define SSH1_CMSG_AUTH_TIS 39 /* 0x27 */
61 #define SSH1_SMSG_AUTH_TIS_CHALLENGE 40 /* 0x28 */
62 #define SSH1_CMSG_AUTH_TIS_RESPONSE 41 /* 0x29 */
63 #define SSH1_CMSG_AUTH_CCARD 70 /* 0x46 */
64 #define SSH1_SMSG_AUTH_CCARD_CHALLENGE 71 /* 0x47 */
65 #define SSH1_CMSG_AUTH_CCARD_RESPONSE 72 /* 0x48 */
67 #define SSH1_AUTH_TIS 5 /* 0x5 */
68 #define SSH1_AUTH_CCARD 16 /* 0x10 */
70 #define SSH_AGENTC_REQUEST_RSA_IDENTITIES 1 /* 0x1 */
71 #define SSH_AGENT_RSA_IDENTITIES_ANSWER 2 /* 0x2 */
72 #define SSH_AGENTC_RSA_CHALLENGE 3 /* 0x3 */
73 #define SSH_AGENT_RSA_RESPONSE 4 /* 0x4 */
74 #define SSH_AGENT_FAILURE 5 /* 0x5 */
75 #define SSH_AGENT_SUCCESS 6 /* 0x6 */
76 #define SSH_AGENTC_ADD_RSA_IDENTITY 7 /* 0x7 */
77 #define SSH_AGENTC_REMOVE_RSA_IDENTITY 8 /* 0x8 */
79 #define SSH2_MSG_DISCONNECT 1 /* 0x1 */
80 #define SSH2_MSG_IGNORE 2 /* 0x2 */
81 #define SSH2_MSG_UNIMPLEMENTED 3 /* 0x3 */
82 #define SSH2_MSG_DEBUG 4 /* 0x4 */
83 #define SSH2_MSG_SERVICE_REQUEST 5 /* 0x5 */
84 #define SSH2_MSG_SERVICE_ACCEPT 6 /* 0x6 */
85 #define SSH2_MSG_KEXINIT 20 /* 0x14 */
86 #define SSH2_MSG_NEWKEYS 21 /* 0x15 */
87 #define SSH2_MSG_KEXDH_INIT 30 /* 0x1e */
88 #define SSH2_MSG_KEXDH_REPLY 31 /* 0x1f */
89 #define SSH2_MSG_USERAUTH_REQUEST 50 /* 0x32 */
90 #define SSH2_MSG_USERAUTH_FAILURE 51 /* 0x33 */
91 #define SSH2_MSG_USERAUTH_SUCCESS 52 /* 0x34 */
92 #define SSH2_MSG_USERAUTH_BANNER 53 /* 0x35 */
93 #define SSH2_MSG_USERAUTH_PK_OK 60 /* 0x3c */
94 #define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ 60 /* 0x3c */
95 #define SSH2_MSG_GLOBAL_REQUEST 80 /* 0x50 */
96 #define SSH2_MSG_REQUEST_SUCCESS 81 /* 0x51 */
97 #define SSH2_MSG_REQUEST_FAILURE 82 /* 0x52 */
98 #define SSH2_MSG_CHANNEL_OPEN 90 /* 0x5a */
99 #define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION 91 /* 0x5b */
100 #define SSH2_MSG_CHANNEL_OPEN_FAILURE 92 /* 0x5c */
101 #define SSH2_MSG_CHANNEL_WINDOW_ADJUST 93 /* 0x5d */
102 #define SSH2_MSG_CHANNEL_DATA 94 /* 0x5e */
103 #define SSH2_MSG_CHANNEL_EXTENDED_DATA 95 /* 0x5f */
104 #define SSH2_MSG_CHANNEL_EOF 96 /* 0x60 */
105 #define SSH2_MSG_CHANNEL_CLOSE 97 /* 0x61 */
106 #define SSH2_MSG_CHANNEL_REQUEST 98 /* 0x62 */
107 #define SSH2_MSG_CHANNEL_SUCCESS 99 /* 0x63 */
108 #define SSH2_MSG_CHANNEL_FAILURE 100 /* 0x64 */
110 #define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT 1 /* 0x1 */
111 #define SSH2_DISCONNECT_PROTOCOL_ERROR 2 /* 0x2 */
112 #define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED 3 /* 0x3 */
113 #define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED 4 /* 0x4 */
114 #define SSH2_DISCONNECT_MAC_ERROR 5 /* 0x5 */
115 #define SSH2_DISCONNECT_COMPRESSION_ERROR 6 /* 0x6 */
116 #define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE 7 /* 0x7 */
117 #define SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED 8 /* 0x8 */
118 #define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE 9 /* 0x9 */
119 #define SSH2_DISCONNECT_CONNECTION_LOST 10 /* 0xa */
120 #define SSH2_DISCONNECT_BY_APPLICATION 11 /* 0xb */
122 #define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1 /* 0x1 */
123 #define SSH2_OPEN_CONNECT_FAILED 2 /* 0x2 */
124 #define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3 /* 0x3 */
125 #define SSH2_OPEN_RESOURCE_SHORTAGE 4 /* 0x4 */
127 #define SSH2_EXTENDED_DATA_STDERR 1 /* 0x1 */
129 #define GET_32BIT(cp) \
130 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
131 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
132 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
133 ((unsigned long)(unsigned char)(cp)[3]))
135 #define PUT_32BIT(cp, value) { \
136 (cp)[0] = (unsigned char)((value) >> 24); \
137 (cp)[1] = (unsigned char)((value) >> 16); \
138 (cp)[2] = (unsigned char)((value) >> 8); \
139 (cp)[3] = (unsigned char)(value); }
141 enum { PKT_END
, PKT_INT
, PKT_CHAR
, PKT_DATA
, PKT_STR
, PKT_BIGNUM
};
143 /* Coroutine mechanics for the sillier bits of the code */
144 #define crBegin1 static int crLine = 0;
145 #define crBegin2 switch(crLine) { case 0:;
146 #define crBegin crBegin1; crBegin2;
147 #define crFinish(z) } crLine = 0; return (z)
148 #define crFinishV } crLine = 0; return
149 #define crReturn(z) \
151 crLine=__LINE__; return (z); case __LINE__:;\
155 crLine=__LINE__; return; case __LINE__:;\
157 #define crStop(z) do{ crLine = 0; return (z); }while(0)
158 #define crStopV do{ crLine = 0; return; }while(0)
159 #define crWaitUntil(c) do { crReturn(0); } while (!(c))
160 #define crWaitUntilV(c) do { crReturnV; } while (!(c))
162 extern const struct ssh_cipher ssh_3des
;
163 extern const struct ssh_cipher ssh_3des_ssh2
;
164 extern const struct ssh_cipher ssh_des
;
165 extern const struct ssh_cipher ssh_blowfish_ssh1
;
166 extern const struct ssh_cipher ssh_blowfish_ssh2
;
168 extern char *x11_init (Socket
*, char *, void *);
169 extern void x11_close (Socket
);
170 extern void x11_send (Socket
, char *, int);
171 extern void x11_invent_auth(char *, int, char *, int);
174 * Ciphers for SSH2. We miss out single-DES because it isn't
175 * supported; also 3DES and Blowfish are both done differently from
176 * SSH1. (3DES uses outer chaining; Blowfish has the opposite
177 * endianness and different-sized keys.)
179 const static struct ssh_cipher
*ciphers
[] = { &ssh_blowfish_ssh2
, &ssh_3des_ssh2
};
181 extern const struct ssh_kex ssh_diffiehellman
;
182 const static struct ssh_kex
*kex_algs
[] = { &ssh_diffiehellman
};
184 extern const struct ssh_signkey ssh_dss
;
185 const static struct ssh_signkey
*hostkey_algs
[] = { &ssh_dss
};
187 extern const struct ssh_mac ssh_md5
, ssh_sha1
, ssh_sha1_buggy
;
189 static void nullmac_key(unsigned char *key
) { }
190 static void nullmac_generate(unsigned char *blk
, int len
, unsigned long seq
) { }
191 static int nullmac_verify(unsigned char *blk
, int len
, unsigned long seq
) { return 1; }
192 const static struct ssh_mac ssh_mac_none
= {
193 nullmac_key
, nullmac_key
, nullmac_generate
, nullmac_verify
, "none", 0
195 const static struct ssh_mac
*macs
[] = {
196 &ssh_sha1
, &ssh_md5
, &ssh_mac_none
};
197 const static struct ssh_mac
*buggymacs
[] = {
198 &ssh_sha1_buggy
, &ssh_md5
, &ssh_mac_none
};
200 static void ssh_comp_none_init(void) { }
201 static int ssh_comp_none_block(unsigned char *block
, int len
,
202 unsigned char **outblock
, int *outlen
) {
205 const static struct ssh_compress ssh_comp_none
= {
207 ssh_comp_none_init
, ssh_comp_none_block
,
208 ssh_comp_none_init
, ssh_comp_none_block
210 extern const struct ssh_compress ssh_zlib
;
211 const static struct ssh_compress
*compressions
[] = {
212 &ssh_zlib
, &ssh_comp_none
};
214 enum { /* channel types */
221 * 2-3-4 tree storing channels.
224 unsigned remoteid
, localid
;
227 struct ssh2_data_channel
{
228 unsigned char *outbuffer
;
229 unsigned outbuflen
, outbufsize
;
230 unsigned remwindow
, remmaxpkt
;
233 struct ssh_agent_channel
{
234 unsigned char *message
;
235 unsigned char msglen
[4];
236 int lensofar
, totallen
;
238 struct ssh_x11_channel
{
253 static SHA_State exhash
, exhashbase
;
255 static Socket s
= NULL
;
257 static unsigned char session_key
[32];
258 static int ssh1_compressing
;
259 static int ssh_agentfwd_enabled
;
260 static int ssh_X11_fwd_enabled
;
261 static const struct ssh_cipher
*cipher
= NULL
;
262 static const struct ssh_cipher
*cscipher
= NULL
;
263 static const struct ssh_cipher
*sccipher
= NULL
;
264 static const struct ssh_mac
*csmac
= NULL
;
265 static const struct ssh_mac
*scmac
= NULL
;
266 static const struct ssh_compress
*cscomp
= NULL
;
267 static const struct ssh_compress
*sccomp
= NULL
;
268 static const struct ssh_kex
*kex
= NULL
;
269 static const struct ssh_signkey
*hostkey
= NULL
;
270 int (*ssh_get_password
)(const char *prompt
, char *str
, int maxlen
) = NULL
;
272 static char *savedhost
;
273 static int savedport
;
274 static int ssh_send_ok
;
276 static tree234
*ssh_channels
; /* indexed by local id */
277 static struct ssh_channel
*mainchan
; /* primary session channel */
281 SSH_STATE_BEFORE_SIZE
,
285 } ssh_state
= SSH_STATE_PREPACKET
;
287 static int size_needed
= FALSE
, eof_needed
= FALSE
;
289 static struct Packet pktin
= { 0, 0, NULL
, NULL
, 0 };
290 static struct Packet pktout
= { 0, 0, NULL
, NULL
, 0 };
292 static int ssh_version
;
293 static void (*ssh_protocol
)(unsigned char *in
, int inlen
, int ispkt
);
294 static void ssh1_protocol(unsigned char *in
, int inlen
, int ispkt
);
295 static void ssh2_protocol(unsigned char *in
, int inlen
, int ispkt
);
296 static void ssh_size(void);
297 static void ssh_special (Telnet_Special
);
298 static void ssh2_try_send(struct ssh_channel
*c
);
299 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
, int len
);
301 static int (*s_rdpkt
)(unsigned char **data
, int *datalen
);
303 static struct rdpkt1_state_tag
{
304 long len
, pad
, biglen
, to_read
;
305 unsigned long realcrc
, gotcrc
;
311 static struct rdpkt2_state_tag
{
312 long len
, pad
, payload
, packetlen
, maclen
;
315 unsigned long incoming_sequence
;
318 static int ssh_channelcmp(void *av
, void *bv
) {
319 struct ssh_channel
*a
= (struct ssh_channel
*)av
;
320 struct ssh_channel
*b
= (struct ssh_channel
*)bv
;
321 if (a
->localid
< b
->localid
) return -1;
322 if (a
->localid
> b
->localid
) return +1;
325 static int ssh_channelfind(void *av
, void *bv
) {
326 unsigned *a
= (unsigned *)av
;
327 struct ssh_channel
*b
= (struct ssh_channel
*)bv
;
328 if (*a
< b
->localid
) return -1;
329 if (*a
> b
->localid
) return +1;
333 static void c_write (char *buf
, int len
) {
334 if ((flags
& FLAG_STDERR
)) {
336 for (i
= 0; i
< len
; i
++)
338 fputc(buf
[i
], stderr
);
341 from_backend(1, buf
, len
);
345 * Collect incoming data in the incoming packet buffer.
346 * Decipher and verify the packet when it is completely read.
347 * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets.
348 * Update the *data and *datalen variables.
349 * Return the additional nr of bytes needed, or 0 when
350 * a complete packet is available.
352 static int ssh1_rdpkt(unsigned char **data
, int *datalen
)
354 struct rdpkt1_state_tag
*st
= &rdpkt1_state
;
363 for (st
->i
= st
->len
= 0; st
->i
< 4; st
->i
++) {
364 while ((*datalen
) == 0)
366 st
->len
= (st
->len
<< 8) + **data
;
367 (*data
)++, (*datalen
)--;
371 if (st
->len
== 0x52656d6f) { /* "Remo"te server has closed ... */
372 st
->len
= 0x300; /* big enough to carry to end */
376 st
->pad
= 8 - (st
->len
% 8);
377 st
->biglen
= st
->len
+ st
->pad
;
378 pktin
.length
= st
->len
- 5;
380 if (pktin
.maxlen
< st
->biglen
) {
381 pktin
.maxlen
= st
->biglen
;
382 pktin
.data
= (pktin
.data
== NULL ?
smalloc(st
->biglen
+APIEXTRA
) :
383 srealloc(pktin
.data
, st
->biglen
+APIEXTRA
));
385 fatalbox("Out of memory");
388 st
->to_read
= st
->biglen
;
390 while (st
->to_read
> 0) {
391 st
->chunk
= st
->to_read
;
392 while ((*datalen
) == 0)
393 crReturn(st
->to_read
);
394 if (st
->chunk
> (*datalen
))
395 st
->chunk
= (*datalen
);
396 memcpy(st
->p
, *data
, st
->chunk
);
398 *datalen
-= st
->chunk
;
400 st
->to_read
-= st
->chunk
;
404 cipher
->decrypt(pktin
.data
, st
->biglen
);
406 debug(("Got packet len=%d pad=%d\r\n", st
->len
, st
->pad
));
407 for (st
->i
= 0; st
->i
< st
->biglen
; st
->i
++)
408 debug((" %02x", (unsigned char)pktin
.data
[st
->i
]));
412 st
->realcrc
= crc32(pktin
.data
, st
->biglen
-4);
413 st
->gotcrc
= GET_32BIT(pktin
.data
+st
->biglen
-4);
414 if (st
->gotcrc
!= st
->realcrc
) {
415 bombout(("Incorrect CRC received on packet"));
419 pktin
.body
= pktin
.data
+ st
->pad
+ 1;
421 if (ssh1_compressing
) {
422 unsigned char *decompblk
;
426 debug(("Packet payload pre-decompression:\n"));
427 for (i
= -1; i
< pktin
.length
; i
++)
428 debug((" %02x", (unsigned char)pktin
.body
[i
]));
431 zlib_decompress_block(pktin
.body
-1, pktin
.length
+1,
432 &decompblk
, &decomplen
);
434 if (pktin
.maxlen
< st
->pad
+ decomplen
) {
435 pktin
.maxlen
= st
->pad
+ decomplen
;
436 pktin
.data
= srealloc(pktin
.data
, pktin
.maxlen
+APIEXTRA
);
437 pktin
.body
= pktin
.data
+ st
->pad
+ 1;
439 fatalbox("Out of memory");
442 memcpy(pktin
.body
-1, decompblk
, decomplen
);
444 pktin
.length
= decomplen
-1;
446 debug(("Packet payload post-decompression:\n"));
447 for (i
= -1; i
< pktin
.length
; i
++)
448 debug((" %02x", (unsigned char)pktin
.body
[i
]));
453 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
454 pktin
.type
== SSH1_SMSG_STDERR_DATA
||
455 pktin
.type
== SSH1_MSG_DEBUG
||
456 pktin
.type
== SSH1_SMSG_AUTH_TIS_CHALLENGE
||
457 pktin
.type
== SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
458 long strlen
= GET_32BIT(pktin
.body
);
459 if (strlen
+ 4 != pktin
.length
) {
460 bombout(("Received data packet with bogus string length"));
465 pktin
.type
= pktin
.body
[-1];
467 if (pktin
.type
== SSH1_MSG_DEBUG
) {
468 /* log debug message */
470 int strlen
= GET_32BIT(pktin
.body
);
471 strcpy(buf
, "Remote: ");
472 if (strlen
> 70) strlen
= 70;
473 memcpy(buf
+8, pktin
.body
+4, strlen
);
474 buf
[8+strlen
] = '\0';
477 } else if (pktin
.type
== SSH1_MSG_IGNORE
) {
485 static int ssh2_rdpkt(unsigned char **data
, int *datalen
)
487 struct rdpkt2_state_tag
*st
= &rdpkt2_state
;
495 st
->cipherblk
= sccipher
->blksize
;
498 if (st
->cipherblk
< 8)
501 if (pktin
.maxlen
< st
->cipherblk
) {
502 pktin
.maxlen
= st
->cipherblk
;
503 pktin
.data
= (pktin
.data
== NULL ?
smalloc(st
->cipherblk
+APIEXTRA
) :
504 srealloc(pktin
.data
, st
->cipherblk
+APIEXTRA
));
506 fatalbox("Out of memory");
510 * Acquire and decrypt the first block of the packet. This will
511 * contain the length and padding details.
513 for (st
->i
= st
->len
= 0; st
->i
< st
->cipherblk
; st
->i
++) {
514 while ((*datalen
) == 0)
515 crReturn(st
->cipherblk
-st
->i
);
516 pktin
.data
[st
->i
] = *(*data
)++;
520 if (!memcmp(pktin
.data
, "Remo", 4)) {/* "Remo"te server has closed ... */
525 sccipher
->decrypt(pktin
.data
, st
->cipherblk
);
528 * Now get the length and padding figures.
530 st
->len
= GET_32BIT(pktin
.data
);
531 st
->pad
= pktin
.data
[4];
534 * This enables us to deduce the payload length.
536 st
->payload
= st
->len
- st
->pad
- 1;
538 pktin
.length
= st
->payload
+ 5;
541 * So now we can work out the total packet length.
543 st
->packetlen
= st
->len
+ 4;
544 st
->maclen
= scmac ? scmac
->len
: 0;
547 * Adjust memory allocation if packet is too big.
549 if (pktin
.maxlen
< st
->packetlen
+st
->maclen
) {
550 pktin
.maxlen
= st
->packetlen
+st
->maclen
;
551 pktin
.data
= (pktin
.data
== NULL ?
smalloc(pktin
.maxlen
+APIEXTRA
) :
552 srealloc(pktin
.data
, pktin
.maxlen
+APIEXTRA
));
554 fatalbox("Out of memory");
558 * Read and decrypt the remainder of the packet.
560 for (st
->i
= st
->cipherblk
; st
->i
< st
->packetlen
+ st
->maclen
; st
->i
++) {
561 while ((*datalen
) == 0)
562 crReturn(st
->packetlen
+ st
->maclen
- st
->i
);
563 pktin
.data
[st
->i
] = *(*data
)++;
566 /* Decrypt everything _except_ the MAC. */
568 sccipher
->decrypt(pktin
.data
+ st
->cipherblk
,
569 st
->packetlen
- st
->cipherblk
);
572 debug(("Got packet len=%d pad=%d\r\n", st
->len
, st
->pad
));
573 for (st
->i
= 0; st
->i
< st
->packetlen
; st
->i
++)
574 debug((" %02x", (unsigned char)pktin
.data
[st
->i
]));
581 if (scmac
&& !scmac
->verify(pktin
.data
, st
->len
+4, st
->incoming_sequence
)) {
582 bombout(("Incorrect MAC received on packet"));
585 st
->incoming_sequence
++; /* whether or not we MACed */
588 * Decompress packet payload.
591 unsigned char *newpayload
;
593 if (sccomp
&& sccomp
->decompress(pktin
.data
+5, pktin
.length
-5,
594 &newpayload
, &newlen
)) {
595 if (pktin
.maxlen
< newlen
+5) {
596 pktin
.maxlen
= newlen
+5;
597 pktin
.data
= (pktin
.data
== NULL ?
smalloc(pktin
.maxlen
+APIEXTRA
) :
598 srealloc(pktin
.data
, pktin
.maxlen
+APIEXTRA
));
600 fatalbox("Out of memory");
602 pktin
.length
= 5 + newlen
;
603 memcpy(pktin
.data
+5, newpayload
, newlen
);
605 debug(("Post-decompression payload:\r\n"));
606 for (st
->i
= 0; st
->i
< newlen
; st
->i
++)
607 debug((" %02x", (unsigned char)pktin
.data
[5+st
->i
]));
616 pktin
.type
= pktin
.data
[5];
618 if (pktin
.type
== SSH2_MSG_IGNORE
|| pktin
.type
== SSH2_MSG_DEBUG
)
619 goto next_packet
; /* FIXME: print DEBUG message */
624 static void ssh1_pktout_size(int len
) {
627 len
+= 5; /* type and CRC */
631 pktout
.length
= len
-5;
632 if (pktout
.maxlen
< biglen
) {
633 pktout
.maxlen
= biglen
;
635 /* Allocate enough buffer space for extra block
636 * for MS CryptEncrypt() */
637 pktout
.data
= (pktout
.data
== NULL ?
smalloc(biglen
+12) :
638 srealloc(pktout
.data
, biglen
+12));
640 pktout
.data
= (pktout
.data
== NULL ?
smalloc(biglen
+4) :
641 srealloc(pktout
.data
, biglen
+4));
644 fatalbox("Out of memory");
646 pktout
.body
= pktout
.data
+4+pad
+1;
649 static void s_wrpkt_start(int type
, int len
) {
650 ssh1_pktout_size(len
);
654 static void s_wrpkt(void) {
655 int pad
, len
, biglen
, i
;
658 pktout
.body
[-1] = pktout
.type
;
660 if (ssh1_compressing
) {
661 unsigned char *compblk
;
664 debug(("Packet payload pre-compression:\n"));
665 for (i
= -1; i
< pktout
.length
; i
++)
666 debug((" %02x", (unsigned char)pktout
.body
[i
]));
669 zlib_compress_block(pktout
.body
-1, pktout
.length
+1,
671 ssh1_pktout_size(complen
-1);
672 memcpy(pktout
.body
-1, compblk
, complen
);
675 debug(("Packet payload post-compression:\n"));
676 for (i
= -1; i
< pktout
.length
; i
++)
677 debug((" %02x", (unsigned char)pktout
.body
[i
]));
682 len
= pktout
.length
+ 5; /* type and CRC */
686 for (i
=0; i
<pad
; i
++)
687 pktout
.data
[i
+4] = random_byte();
688 crc
= crc32(pktout
.data
+4, biglen
-4);
689 PUT_32BIT(pktout
.data
+biglen
, crc
);
690 PUT_32BIT(pktout
.data
, len
);
693 debug(("Sending packet len=%d\r\n", biglen
+4));
694 for (i
= 0; i
< biglen
+4; i
++)
695 debug((" %02x", (unsigned char)pktout
.data
[i
]));
699 cipher
->encrypt(pktout
.data
+4, biglen
);
701 sk_write(s
, pktout
.data
, biglen
+4);
705 * Construct a packet with the specified contents and
706 * send it to the server.
708 static void send_packet(int pkttype
, ...)
711 unsigned char *p
, *argp
, argchar
;
712 unsigned long argint
;
713 int pktlen
, argtype
, arglen
;
717 va_start(args
, pkttype
);
718 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
721 (void) va_arg(args
, int);
725 (void) va_arg(args
, char);
729 (void) va_arg(args
, unsigned char *);
730 arglen
= va_arg(args
, int);
734 argp
= va_arg(args
, unsigned char *);
735 arglen
= strlen(argp
);
736 pktlen
+= 4 + arglen
;
739 bn
= va_arg(args
, Bignum
);
740 pktlen
+= ssh1_bignum_length(bn
);
748 s_wrpkt_start(pkttype
, pktlen
);
751 va_start(args
, pkttype
);
752 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
755 argint
= va_arg(args
, int);
756 PUT_32BIT(p
, argint
);
760 argchar
= va_arg(args
, unsigned char);
765 argp
= va_arg(args
, unsigned char *);
766 arglen
= va_arg(args
, int);
767 memcpy(p
, argp
, arglen
);
771 argp
= va_arg(args
, unsigned char *);
772 arglen
= strlen(argp
);
773 PUT_32BIT(p
, arglen
);
774 memcpy(p
+ 4, argp
, arglen
);
778 bn
= va_arg(args
, Bignum
);
779 p
+= ssh1_write_bignum(p
, bn
);
788 static int ssh_versioncmp(char *a
, char *b
) {
790 unsigned long av
, bv
;
792 av
= strtoul(a
, &ae
, 10);
793 bv
= strtoul(b
, &be
, 10);
794 if (av
!= bv
) return (av
< bv ?
-1 : +1);
795 if (*ae
== '.') ae
++;
796 if (*be
== '.') be
++;
797 av
= strtoul(ae
, &ae
, 10);
798 bv
= strtoul(be
, &be
, 10);
799 if (av
!= bv
) return (av
< bv ?
-1 : +1);
805 * Utility routine for putting an SSH-protocol `string' into a SHA
809 static void sha_string(SHA_State
*s
, void *str
, int len
) {
810 unsigned char lenblk
[4];
811 PUT_32BIT(lenblk
, len
);
812 SHA_Bytes(s
, lenblk
, 4);
813 SHA_Bytes(s
, str
, len
);
817 * SSH2 packet construction functions.
819 static void ssh2_pkt_ensure(int length
) {
820 if (pktout
.maxlen
< length
) {
821 pktout
.maxlen
= length
+ 256;
822 pktout
.data
= (pktout
.data
== NULL ?
smalloc(pktout
.maxlen
+APIEXTRA
) :
823 srealloc(pktout
.data
, pktout
.maxlen
+APIEXTRA
));
825 fatalbox("Out of memory");
828 static void ssh2_pkt_adddata(void *data
, int len
) {
829 pktout
.length
+= len
;
830 ssh2_pkt_ensure(pktout
.length
);
831 memcpy(pktout
.data
+pktout
.length
-len
, data
, len
);
833 static void ssh2_pkt_addbyte(unsigned char byte
) {
834 ssh2_pkt_adddata(&byte
, 1);
836 static void ssh2_pkt_init(int pkt_type
) {
838 ssh2_pkt_addbyte((unsigned char)pkt_type
);
840 static void ssh2_pkt_addbool(unsigned char value
) {
841 ssh2_pkt_adddata(&value
, 1);
843 static void ssh2_pkt_adduint32(unsigned long value
) {
846 ssh2_pkt_adddata(x
, 4);
848 static void ssh2_pkt_addstring_start(void) {
849 ssh2_pkt_adduint32(0);
850 pktout
.savedpos
= pktout
.length
;
852 static void ssh2_pkt_addstring_str(char *data
) {
853 ssh2_pkt_adddata(data
, strlen(data
));
854 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
855 pktout
.length
- pktout
.savedpos
);
857 static void ssh2_pkt_addstring_data(char *data
, int len
) {
858 ssh2_pkt_adddata(data
, len
);
859 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
860 pktout
.length
- pktout
.savedpos
);
862 static void ssh2_pkt_addstring(char *data
) {
863 ssh2_pkt_addstring_start();
864 ssh2_pkt_addstring_str(data
);
866 static char *ssh2_mpint_fmt(Bignum b
, int *len
) {
869 p
= smalloc(n
* 2 + 1);
871 fatalbox("out of memory");
873 for (i
= 0; i
< n
; i
++) {
874 p
[i
*2+1] = (b
[n
-i
] >> 8) & 0xFF;
875 p
[i
*2+2] = (b
[n
-i
] ) & 0xFF;
878 while (p
[i
] == 0 && (p
[i
+1] & 0x80) == 0)
880 memmove(p
, p
+i
, n
*2+1-i
);
884 static void ssh2_pkt_addmp(Bignum b
) {
887 p
= ssh2_mpint_fmt(b
, &len
);
888 ssh2_pkt_addstring_start();
889 ssh2_pkt_addstring_data(p
, len
);
892 static void ssh2_pkt_send(void) {
893 int cipherblk
, maclen
, padding
, i
;
894 static unsigned long outgoing_sequence
= 0;
897 * Compress packet payload.
900 debug(("Pre-compression payload:\r\n"));
901 for (i
= 5; i
< pktout
.length
; i
++)
902 debug((" %02x", (unsigned char)pktout
.data
[i
]));
906 unsigned char *newpayload
;
908 if (cscomp
&& cscomp
->compress(pktout
.data
+5, pktout
.length
-5,
909 &newpayload
, &newlen
)) {
911 ssh2_pkt_adddata(newpayload
, newlen
);
917 * Add padding. At least four bytes, and must also bring total
918 * length (minus MAC) up to a multiple of the block size.
920 cipherblk
= cipher ? cipher
->blksize
: 8; /* block size */
921 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
923 padding
+= (cipherblk
- (pktout
.length
+ padding
) % cipherblk
) % cipherblk
;
924 maclen
= csmac ? csmac
->len
: 0;
925 ssh2_pkt_ensure(pktout
.length
+ padding
+ maclen
);
926 pktout
.data
[4] = padding
;
927 for (i
= 0; i
< padding
; i
++)
928 pktout
.data
[pktout
.length
+ i
] = random_byte();
929 PUT_32BIT(pktout
.data
, pktout
.length
+ padding
- 4);
931 csmac
->generate(pktout
.data
, pktout
.length
+ padding
,
933 outgoing_sequence
++; /* whether or not we MACed */
936 debug(("Sending packet len=%d\r\n", pktout
.length
+padding
));
937 for (i
= 0; i
< pktout
.length
+padding
; i
++)
938 debug((" %02x", (unsigned char)pktout
.data
[i
]));
943 cscipher
->encrypt(pktout
.data
, pktout
.length
+ padding
);
945 sk_write(s
, pktout
.data
, pktout
.length
+ padding
+ maclen
);
949 void bndebug(char *string
, Bignum b
) {
952 p
= ssh2_mpint_fmt(b
, &len
);
953 debug(("%s", string
));
954 for (i
= 0; i
< len
; i
++)
955 debug((" %02x", p
[i
]));
961 static void sha_mpint(SHA_State
*s
, Bignum b
) {
964 p
= ssh2_mpint_fmt(b
, &len
);
965 sha_string(s
, p
, len
);
970 * SSH2 packet decode functions.
972 static unsigned long ssh2_pkt_getuint32(void) {
974 if (pktin
.length
- pktin
.savedpos
< 4)
975 return 0; /* arrgh, no way to decline (FIXME?) */
976 value
= GET_32BIT(pktin
.data
+pktin
.savedpos
);
980 static void ssh2_pkt_getstring(char **p
, int *length
) {
982 if (pktin
.length
- pktin
.savedpos
< 4)
984 *length
= GET_32BIT(pktin
.data
+pktin
.savedpos
);
986 if (pktin
.length
- pktin
.savedpos
< *length
)
988 *p
= pktin
.data
+pktin
.savedpos
;
989 pktin
.savedpos
+= *length
;
991 static Bignum
ssh2_pkt_getmp(void) {
996 ssh2_pkt_getstring(&p
, &length
);
1000 bombout(("internal error: Can't handle negative mpints"));
1003 b
= newbn((length
+1)/2);
1004 for (i
= 0; i
< length
; i
++) {
1007 b
[j
/2+1] |= ((unsigned char)p
[i
]) << 8;
1009 b
[j
/2+1] |= ((unsigned char)p
[i
]);
1011 while (b
[0] > 1 && b
[b
[0]] == 0) b
[0]--;
1015 static int do_ssh_init(unsigned char c
) {
1017 static char version
[10];
1018 static char vstring
[80];
1019 static char vlog
[sizeof(vstring
)+20];
1024 /* Search for the string "SSH-" in the input. */
1027 static const int transS
[] = { 1, 2, 2, 1 };
1028 static const int transH
[] = { 0, 0, 3, 0 };
1029 static const int transminus
[] = { 0, 0, 0, -1 };
1030 if (c
== 'S') i
= transS
[i
];
1031 else if (c
== 'H') i
= transH
[i
];
1032 else if (c
== '-') i
= transminus
[i
];
1036 crReturn(1); /* get another character */
1039 strcpy(vstring
, "SSH-");
1043 crReturn(1); /* get another char */
1044 if (vsp
< vstring
+sizeof(vstring
)-1)
1050 } else if (i
< sizeof(version
)-1)
1057 ssh_agentfwd_enabled
= FALSE
;
1058 rdpkt2_state
.incoming_sequence
= 0;
1061 sprintf(vlog
, "Server version: %s", vstring
);
1062 vlog
[strcspn(vlog
, "\r\n")] = '\0';
1066 * Server version "1.99" means we can choose whether we use v1
1067 * or v2 protocol. Choice is based on cfg.sshprot.
1069 if (ssh_versioncmp(version
, cfg
.sshprot
== 1 ?
"2.0" : "1.99") >= 0) {
1071 * This is a v2 server. Begin v2 protocol.
1073 char *verstring
= "SSH-2.0-PuTTY";
1074 SHA_Init(&exhashbase
);
1076 * Hash our version string and their version string.
1078 sha_string(&exhashbase
, verstring
, strlen(verstring
));
1079 sha_string(&exhashbase
, vstring
, strcspn(vstring
, "\r\n"));
1080 sprintf(vstring
, "%s\n", verstring
);
1081 sprintf(vlog
, "We claim version: %s", verstring
);
1083 logevent("Using SSH protocol version 2");
1084 sk_write(s
, vstring
, strlen(vstring
));
1085 ssh_protocol
= ssh2_protocol
;
1087 s_rdpkt
= ssh2_rdpkt
;
1090 * This is a v1 server. Begin v1 protocol.
1092 sprintf(vstring
, "SSH-%s-PuTTY\n",
1093 (ssh_versioncmp(version
, "1.5") <= 0 ? version
: "1.5"));
1094 sprintf(vlog
, "We claim version: %s", vstring
);
1095 vlog
[strcspn(vlog
, "\r\n")] = '\0';
1097 logevent("Using SSH protocol version 1");
1098 sk_write(s
, vstring
, strlen(vstring
));
1099 ssh_protocol
= ssh1_protocol
;
1101 s_rdpkt
= ssh1_rdpkt
;
1103 ssh_state
= SSH_STATE_BEFORE_SIZE
;
1108 static void ssh_gotdata(unsigned char *data
, int datalen
)
1113 * To begin with, feed the characters one by one to the
1114 * protocol initialisation / selection function do_ssh_init().
1115 * When that returns 0, we're done with the initial greeting
1116 * exchange and can move on to packet discipline.
1121 crReturnV
; /* more data please */
1122 ret
= do_ssh_init(*data
);
1129 * We emerge from that loop when the initial negotiation is
1130 * over and we have selected an s_rdpkt function. Now pass
1131 * everything to s_rdpkt, and then pass the resulting packets
1132 * to the proper protocol handler.
1137 while (datalen
> 0) {
1138 if ( s_rdpkt(&data
, &datalen
) == 0 ) {
1139 ssh_protocol(NULL
, 0, 1);
1140 if (ssh_state
== SSH_STATE_CLOSED
) {
1150 static int ssh_receive(Socket skt
, int urgent
, char *data
, int len
) {
1152 /* A socket error has occurred. */
1153 connection_fatal(data
);
1157 /* Connection has closed. */
1158 ssh_state
= SSH_STATE_CLOSED
;
1163 ssh_gotdata (data
, len
);
1164 if (ssh_state
== SSH_STATE_CLOSED
) {
1175 * Connect to specified host and port.
1176 * Returns an error message, or NULL on success.
1177 * Also places the canonical host name into `realhost'.
1179 static char *connect_to_host(char *host
, int port
, char **realhost
)
1188 savedhost
= smalloc(1+strlen(host
));
1190 fatalbox("Out of memory");
1191 strcpy(savedhost
, host
);
1194 port
= 22; /* default ssh port */
1207 addr
= sk_namelookup(host
, realhost
);
1208 if ( (err
= sk_addr_error(addr
)) )
1218 s
= sk_new(addr
, port
, 0, ssh_receive
);
1219 if ( (err
= sk_socket_error(s
)) )
1223 sk_write(s
, "connect ", 8);
1224 sk_write(s
, FWhost
, strlen(FWhost
));
1227 sprintf(buf
, " %d\n", FWport
);
1228 sk_write(s
, buf
, strlen(buf
));
1236 * Handle the key exchange and user authentication phases.
1238 static int do_ssh1_login(unsigned char *in
, int inlen
, int ispkt
)
1241 unsigned char *rsabuf
, *keystr1
, *keystr2
;
1242 unsigned char cookie
[8];
1243 struct RSAKey servkey
, hostkey
;
1244 struct MD5Context md5c
;
1245 static unsigned long supported_ciphers_mask
, supported_auths_mask
;
1246 static int tried_publickey
;
1247 static unsigned char session_id
[16];
1249 static char username
[100];
1253 if (!ispkt
) crWaitUntil(ispkt
);
1255 if (pktin
.type
!= SSH1_SMSG_PUBLIC_KEY
) {
1256 bombout(("Public key packet not received"));
1260 logevent("Received public keys");
1262 memcpy(cookie
, pktin
.body
, 8);
1264 i
= makekey(pktin
.body
+8, &servkey
, &keystr1
, 0);
1265 j
= makekey(pktin
.body
+8+i
, &hostkey
, &keystr2
, 0);
1268 * Log the host key fingerprint.
1272 logevent("Host key fingerprint is:");
1273 strcpy(logmsg
, " ");
1274 hostkey
.comment
= NULL
;
1275 rsa_fingerprint(logmsg
+strlen(logmsg
), sizeof(logmsg
)-strlen(logmsg
),
1280 supported_ciphers_mask
= GET_32BIT(pktin
.body
+12+i
+j
);
1281 supported_auths_mask
= GET_32BIT(pktin
.body
+16+i
+j
);
1284 MD5Update(&md5c
, keystr2
, hostkey
.bytes
);
1285 MD5Update(&md5c
, keystr1
, servkey
.bytes
);
1286 MD5Update(&md5c
, pktin
.body
, 8);
1287 MD5Final(session_id
, &md5c
);
1289 for (i
=0; i
<32; i
++)
1290 session_key
[i
] = random_byte();
1292 len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
1294 rsabuf
= smalloc(len
);
1296 fatalbox("Out of memory");
1299 * Verify the host key.
1303 * First format the key into a string.
1305 int len
= rsastr_len(&hostkey
);
1306 char fingerprint
[100];
1307 char *keystr
= smalloc(len
);
1309 fatalbox("Out of memory");
1310 rsastr_fmt(keystr
, &hostkey
);
1311 rsa_fingerprint(fingerprint
, sizeof(fingerprint
), &hostkey
);
1312 verify_ssh_host_key(savedhost
, savedport
, "rsa", keystr
, fingerprint
);
1316 for (i
=0; i
<32; i
++) {
1317 rsabuf
[i
] = session_key
[i
];
1319 rsabuf
[i
] ^= session_id
[i
];
1322 if (hostkey
.bytes
> servkey
.bytes
) {
1323 rsaencrypt(rsabuf
, 32, &servkey
);
1324 rsaencrypt(rsabuf
, servkey
.bytes
, &hostkey
);
1326 rsaencrypt(rsabuf
, 32, &hostkey
);
1327 rsaencrypt(rsabuf
, hostkey
.bytes
, &servkey
);
1330 logevent("Encrypted session key");
1332 cipher_type
= cfg
.cipher
== CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH
:
1333 cfg
.cipher
== CIPHER_DES ? SSH_CIPHER_DES
:
1335 if ((supported_ciphers_mask
& (1 << cipher_type
)) == 0) {
1336 c_write("Selected cipher not supported, falling back to 3DES\r\n", 53);
1337 cipher_type
= SSH_CIPHER_3DES
;
1339 switch (cipher_type
) {
1340 case SSH_CIPHER_3DES
: logevent("Using 3DES encryption"); break;
1341 case SSH_CIPHER_DES
: logevent("Using single-DES encryption"); break;
1342 case SSH_CIPHER_BLOWFISH
: logevent("Using Blowfish encryption"); break;
1345 send_packet(SSH1_CMSG_SESSION_KEY
,
1346 PKT_CHAR
, cipher_type
,
1347 PKT_DATA
, cookie
, 8,
1348 PKT_CHAR
, (len
*8) >> 8, PKT_CHAR
, (len
*8) & 0xFF,
1349 PKT_DATA
, rsabuf
, len
,
1353 logevent("Trying to enable encryption...");
1357 cipher
= cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish_ssh1
:
1358 cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
1360 cipher
->sesskey(session_key
);
1364 if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1365 bombout(("Encryption not successfully enabled"));
1369 logevent("Successfully started encryption");
1375 if ((flags
& FLAG_INTERACTIVE
) && !*cfg
.username
) {
1376 c_write("login as: ", 10);
1379 crWaitUntil(!ispkt
);
1380 while (inlen
--) switch (c
= *in
++) {
1387 c_write("\b \b", 3);
1393 c_write("\b \b", 3);
1402 if (((c
>= ' ' && c
<= '~') ||
1403 ((unsigned char)c
>= 160)) && pos
< 40) {
1404 username
[pos
++] = c
;
1411 username
[strcspn(username
, "\n\r")] = '\0';
1413 strncpy(username
, cfg
.username
, 99);
1414 username
[99] = '\0';
1417 send_packet(SSH1_CMSG_USER
, PKT_STR
, username
, PKT_END
);
1419 char userlog
[22+sizeof(username
)];
1420 sprintf(userlog
, "Sent username \"%s\"", username
);
1422 if (flags
& FLAG_INTERACTIVE
&&
1423 (!((flags
& FLAG_STDERR
) && (flags
& FLAG_VERBOSE
)))) {
1424 strcat(userlog
, "\r\n");
1425 c_write(userlog
, strlen(userlog
));
1432 tried_publickey
= 0;
1434 while (pktin
.type
== SSH1_SMSG_FAILURE
) {
1435 static char password
[100];
1436 static char prompt
[200];
1439 static int pwpkt_type
;
1441 * Show password prompt, having first obtained it via a TIS
1442 * or CryptoCard exchange if we're doing TIS or CryptoCard
1445 pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
1446 if (agent_exists()) {
1448 * Attempt RSA authentication using Pageant.
1450 static unsigned char request
[5], *response
, *p
;
1451 static int responselen
;
1452 static int i
, nkeys
;
1453 static int authed
= FALSE
;
1456 logevent("Pageant is running. Requesting keys.");
1458 /* Request the keys held by the agent. */
1459 PUT_32BIT(request
, 1);
1460 request
[4] = SSH_AGENTC_REQUEST_RSA_IDENTITIES
;
1461 agent_query(request
, 5, &r
, &responselen
);
1462 response
= (unsigned char *)r
;
1465 nkeys
= GET_32BIT(p
); p
+= 4;
1466 { char buf
[64]; sprintf(buf
, "Pageant has %d keys", nkeys
);
1468 for (i
= 0; i
< nkeys
; i
++) {
1469 static struct RSAKey key
;
1470 static Bignum challenge
;
1471 static char *commentp
;
1472 static int commentlen
;
1474 { char buf
[64]; sprintf(buf
, "Trying Pageant key #%d", i
);
1477 p
+= ssh1_read_bignum(p
, &key
.exponent
);
1478 p
+= ssh1_read_bignum(p
, &key
.modulus
);
1479 commentlen
= GET_32BIT(p
); p
+= 4;
1480 commentp
= p
; p
+= commentlen
;
1481 send_packet(SSH1_CMSG_AUTH_RSA
,
1482 PKT_BIGNUM
, key
.modulus
, PKT_END
);
1484 if (pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
1485 logevent("Key refused");
1488 logevent("Received RSA challenge");
1489 ssh1_read_bignum(pktin
.body
, &challenge
);
1491 char *agentreq
, *q
, *ret
;
1493 len
= 1 + 4; /* message type, bit count */
1494 len
+= ssh1_bignum_length(key
.exponent
);
1495 len
+= ssh1_bignum_length(key
.modulus
);
1496 len
+= ssh1_bignum_length(challenge
);
1497 len
+= 16; /* session id */
1498 len
+= 4; /* response format */
1499 agentreq
= smalloc(4 + len
);
1500 PUT_32BIT(agentreq
, len
);
1502 *q
++ = SSH_AGENTC_RSA_CHALLENGE
;
1503 PUT_32BIT(q
, ssh1_bignum_bitcount(key
.modulus
));
1505 q
+= ssh1_write_bignum(q
, key
.exponent
);
1506 q
+= ssh1_write_bignum(q
, key
.modulus
);
1507 q
+= ssh1_write_bignum(q
, challenge
);
1508 memcpy(q
, session_id
, 16); q
+= 16;
1509 PUT_32BIT(q
, 1); /* response format */
1510 agent_query(agentreq
, len
+4, &ret
, &retlen
);
1513 if (ret
[4] == SSH_AGENT_RSA_RESPONSE
) {
1514 logevent("Sending Pageant's response");
1515 send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE
,
1516 PKT_DATA
, ret
+5, 16, PKT_END
);
1519 if (pktin
.type
== SSH1_SMSG_SUCCESS
) {
1520 logevent("Pageant's response accepted");
1521 if (flags
& FLAG_VERBOSE
) {
1522 c_write("Authenticated using RSA key \"",
1524 c_write(commentp
, commentlen
);
1525 c_write("\" from agent\r\n", 14);
1529 logevent("Pageant's response not accepted");
1531 logevent("Pageant failed to answer challenge");
1535 logevent("No reply received from Pageant");
1538 freebn(key
.exponent
);
1539 freebn(key
.modulus
);
1548 if (*cfg
.keyfile
&& !tried_publickey
)
1549 pwpkt_type
= SSH1_CMSG_AUTH_RSA
;
1551 if (pktin
.type
== SSH1_SMSG_FAILURE
&&
1553 (supported_auths_mask
& (1<<SSH1_AUTH_TIS
))) {
1554 pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
1555 logevent("Requested TIS authentication");
1556 send_packet(SSH1_CMSG_AUTH_TIS
, PKT_END
);
1558 if (pktin
.type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
1559 logevent("TIS authentication declined");
1560 if (flags
& FLAG_INTERACTIVE
)
1561 c_write("TIS authentication refused.\r\n", 29);
1563 int challengelen
= ((pktin
.body
[0] << 24) |
1564 (pktin
.body
[1] << 16) |
1565 (pktin
.body
[2] << 8) |
1567 logevent("Received TIS challenge");
1568 if (challengelen
> sizeof(prompt
)-1)
1569 challengelen
= sizeof(prompt
)-1; /* prevent overrun */
1570 memcpy(prompt
, pktin
.body
+4, challengelen
);
1571 prompt
[challengelen
] = '\0';
1574 if (pktin
.type
== SSH1_SMSG_FAILURE
&&
1576 (supported_auths_mask
& (1<<SSH1_AUTH_CCARD
))) {
1577 pwpkt_type
= SSH1_CMSG_AUTH_CCARD_RESPONSE
;
1578 logevent("Requested CryptoCard authentication");
1579 send_packet(SSH1_CMSG_AUTH_CCARD
, PKT_END
);
1581 if (pktin
.type
!= SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
1582 logevent("CryptoCard authentication declined");
1583 c_write("CryptoCard authentication refused.\r\n", 29);
1585 int challengelen
= ((pktin
.body
[0] << 24) |
1586 (pktin
.body
[1] << 16) |
1587 (pktin
.body
[2] << 8) |
1589 logevent("Received CryptoCard challenge");
1590 if (challengelen
> sizeof(prompt
)-1)
1591 challengelen
= sizeof(prompt
)-1; /* prevent overrun */
1592 memcpy(prompt
, pktin
.body
+4, challengelen
);
1593 strncpy(prompt
+ challengelen
, "\r\nResponse : ",
1594 sizeof(prompt
)-challengelen
);
1595 prompt
[sizeof(prompt
)-1] = '\0';
1598 if (pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
1599 sprintf(prompt
, "%.90s@%.90s's password: ",
1600 username
, savedhost
);
1602 if (pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
1603 char *comment
= NULL
;
1604 if (flags
& FLAG_VERBOSE
)
1605 c_write("Trying public key authentication.\r\n", 35);
1606 if (!rsakey_encrypted(cfg
.keyfile
, &comment
)) {
1607 if (flags
& FLAG_VERBOSE
)
1608 c_write("No passphrase required.\r\n", 25);
1611 sprintf(prompt
, "Passphrase for key \"%.100s\": ", comment
);
1615 if (ssh_get_password
) {
1616 if (!ssh_get_password(prompt
, password
, sizeof(password
))) {
1618 * get_password failed to get a password (for
1619 * example because one was supplied on the command
1620 * line which has already failed to work).
1623 logevent("No more passwords to try");
1624 ssh_state
= SSH_STATE_CLOSED
;
1628 c_write(prompt
, strlen(prompt
));
1632 crWaitUntil(!ispkt
);
1633 while (inlen
--) switch (c
= *in
++) {
1650 if (((c
>= ' ' && c
<= '~') ||
1651 ((unsigned char)c
>= 160)) && pos
< sizeof(password
))
1652 password
[pos
++] = c
;
1660 if (pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
1662 * Try public key authentication with the specified
1665 static struct RSAKey pubkey
;
1666 static Bignum challenge
, response
;
1668 static unsigned char buffer
[32];
1670 tried_publickey
= 1;
1671 i
= loadrsakey(cfg
.keyfile
, &pubkey
, NULL
, password
);
1673 c_write("Couldn't load public key from ", 30);
1674 c_write(cfg
.keyfile
, strlen(cfg
.keyfile
));
1675 c_write(".\r\n", 3);
1676 continue; /* go and try password */
1679 c_write("Wrong passphrase.\r\n", 19);
1680 tried_publickey
= 0;
1681 continue; /* try again */
1685 * Send a public key attempt.
1687 send_packet(SSH1_CMSG_AUTH_RSA
,
1688 PKT_BIGNUM
, pubkey
.modulus
, PKT_END
);
1691 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1692 c_write("Server refused our public key.\r\n", 32);
1693 continue; /* go and try password */
1695 if (pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
1696 bombout(("Bizarre response to offer of public key"));
1699 ssh1_read_bignum(pktin
.body
, &challenge
);
1700 response
= rsadecrypt(challenge
, &pubkey
);
1701 freebn(pubkey
.private_exponent
); /* burn the evidence */
1703 for (i
= 0; i
< 32; i
+= 2) {
1704 buffer
[i
] = response
[16-i
/2] >> 8;
1705 buffer
[i
+1] = response
[16-i
/2] & 0xFF;
1709 MD5Update(&md5c
, buffer
, 32);
1710 MD5Update(&md5c
, session_id
, 16);
1711 MD5Final(buffer
, &md5c
);
1713 send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE
,
1714 PKT_DATA
, buffer
, 16, PKT_END
);
1717 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1718 if (flags
& FLAG_VERBOSE
)
1719 c_write("Failed to authenticate with our public key.\r\n",
1721 continue; /* go and try password */
1722 } else if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1723 bombout(("Bizarre response to RSA authentication response"));
1727 break; /* we're through! */
1729 send_packet(pwpkt_type
, PKT_STR
, password
, PKT_END
);
1731 logevent("Sent password");
1732 memset(password
, 0, strlen(password
));
1734 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1735 if (flags
& FLAG_VERBOSE
)
1736 c_write("Access denied\r\n", 15);
1737 logevent("Authentication refused");
1738 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1739 logevent("Received disconnect request");
1740 ssh_state
= SSH_STATE_CLOSED
;
1742 } else if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1743 bombout(("Strange packet received, type %d", pktin
.type
));
1748 logevent("Authentication successful");
1753 void sshfwd_close(struct ssh_channel
*c
) {
1755 if (ssh_version
== 1) {
1756 send_packet(SSH1_MSG_CHANNEL_CLOSE
, PKT_INT
, c
->remoteid
, PKT_END
);
1758 ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
1759 ssh2_pkt_adduint32(c
->remoteid
);
1763 if (c
->type
== CHAN_X11
) {
1765 logevent("X11 connection terminated");
1770 void sshfwd_write(struct ssh_channel
*c
, char *buf
, int len
) {
1771 if (ssh_version
== 1) {
1772 send_packet(SSH1_MSG_CHANNEL_DATA
,
1773 PKT_INT
, c
->remoteid
,
1778 ssh2_add_channel_data(c
, buf
, len
);
1783 static void ssh1_protocol(unsigned char *in
, int inlen
, int ispkt
) {
1788 while (!do_ssh1_login(in
, inlen
, ispkt
)) {
1791 if (ssh_state
== SSH_STATE_CLOSED
)
1794 if (cfg
.agentfwd
&& agent_exists()) {
1795 logevent("Requesting agent forwarding");
1796 send_packet(SSH1_CMSG_AGENT_REQUEST_FORWARDING
, PKT_END
);
1797 do { crReturnV
; } while (!ispkt
);
1798 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1799 bombout(("Protocol confusion"));
1801 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1802 logevent("Agent forwarding refused");
1804 logevent("Agent forwarding enabled");
1805 ssh_agentfwd_enabled
= TRUE
;
1809 if (cfg
.x11_forward
) {
1810 char proto
[20], data
[64];
1811 logevent("Requesting X11 forwarding");
1812 x11_invent_auth(proto
, sizeof(proto
), data
, sizeof(data
));
1813 send_packet(SSH1_CMSG_X11_REQUEST_FORWARDING
,
1814 PKT_STR
, proto
, PKT_STR
, data
,
1817 do { crReturnV
; } while (!ispkt
);
1818 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1819 bombout(("Protocol confusion"));
1821 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1822 logevent("X11 forwarding refused");
1824 logevent("X11 forwarding enabled");
1825 ssh_X11_fwd_enabled
= TRUE
;
1830 send_packet(SSH1_CMSG_REQUEST_PTY
,
1831 PKT_STR
, cfg
.termtype
,
1832 PKT_INT
, rows
, PKT_INT
, cols
,
1833 PKT_INT
, 0, PKT_INT
, 0,
1836 ssh_state
= SSH_STATE_INTERMED
;
1837 do { crReturnV
; } while (!ispkt
);
1838 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1839 bombout(("Protocol confusion"));
1841 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1842 c_write("Server refused to allocate pty\r\n", 32);
1844 logevent("Allocated pty");
1847 if (cfg
.compression
) {
1848 send_packet(SSH1_CMSG_REQUEST_COMPRESSION
, PKT_INT
, 6, PKT_END
);
1849 do { crReturnV
; } while (!ispkt
);
1850 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1851 bombout(("Protocol confusion"));
1853 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1854 c_write("Server refused to compress\r\n", 32);
1856 logevent("Started compression");
1857 ssh1_compressing
= TRUE
;
1858 zlib_compress_init();
1859 zlib_decompress_init();
1862 if (*cfg
.remote_cmd
)
1863 send_packet(SSH1_CMSG_EXEC_CMD
, PKT_STR
, cfg
.remote_cmd
, PKT_END
);
1865 send_packet(SSH1_CMSG_EXEC_SHELL
, PKT_END
);
1866 logevent("Started session");
1868 ssh_state
= SSH_STATE_SESSION
;
1872 ssh_special(TS_EOF
);
1875 ssh_channels
= newtree234(ssh_channelcmp
);
1880 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
1881 pktin
.type
== SSH1_SMSG_STDERR_DATA
) {
1882 long len
= GET_32BIT(pktin
.body
);
1883 from_backend(pktin
.type
== SSH1_SMSG_STDERR_DATA
,
1885 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1886 ssh_state
= SSH_STATE_CLOSED
;
1887 logevent("Received disconnect request");
1889 } else if (pktin
.type
== SSH1_SMSG_X11_OPEN
) {
1890 /* Remote side is trying to open a channel to talk to our
1891 * X-Server. Give them back a local channel number. */
1893 struct ssh_channel
*c
, *d
;
1896 logevent("Received X11 connect request");
1897 /* Refuse if X11 forwarding is disabled. */
1898 if (!ssh_X11_fwd_enabled
) {
1899 send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE
,
1900 PKT_INT
, GET_32BIT(pktin
.body
),
1902 logevent("Rejected X11 connect request");
1904 c
= smalloc(sizeof(struct ssh_channel
));
1906 if ( x11_init(&c
->u
.x11
.s
, cfg
.x11_display
, c
) != NULL
) {
1907 logevent("opening X11 forward connection failed");
1909 send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE
,
1910 PKT_INT
, GET_32BIT(pktin
.body
),
1913 logevent("opening X11 forward connection succeeded");
1914 for (i
=1, d
= first234(ssh_channels
, &e
); d
; d
= next234(&e
)) {
1916 break; /* found a free number */
1919 c
->remoteid
= GET_32BIT(pktin
.body
);
1922 c
->type
= CHAN_X11
; /* identify channel type */
1923 add234(ssh_channels
, c
);
1924 send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
1925 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
1927 logevent("Opened X11 forward channel");
1930 } else if (pktin
.type
== SSH1_SMSG_AGENT_OPEN
) {
1931 /* Remote side is trying to open a channel to talk to our
1932 * agent. Give them back a local channel number. */
1934 struct ssh_channel
*c
;
1937 /* Refuse if agent forwarding is disabled. */
1938 if (!ssh_agentfwd_enabled
) {
1939 send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE
,
1940 PKT_INT
, GET_32BIT(pktin
.body
),
1944 for (c
= first234(ssh_channels
, &e
); c
; c
= next234(&e
)) {
1946 break; /* found a free number */
1949 c
= smalloc(sizeof(struct ssh_channel
));
1950 c
->remoteid
= GET_32BIT(pktin
.body
);
1953 c
->type
= CHAN_AGENT
; /* identify channel type */
1954 c
->u
.a
.lensofar
= 0;
1955 add234(ssh_channels
, c
);
1956 send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
1957 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
1960 } else if (pktin
.type
== SSH1_MSG_CHANNEL_CLOSE
||
1961 pktin
.type
== SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
) {
1962 /* Remote side closes a channel. */
1963 unsigned i
= GET_32BIT(pktin
.body
);
1964 struct ssh_channel
*c
;
1965 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
1968 closetype
= (pktin
.type
== SSH1_MSG_CHANNEL_CLOSE ?
1 : 2);
1969 send_packet(pktin
.type
, PKT_INT
, c
->remoteid
, PKT_END
);
1970 if ((c
->closes
== 0) && (c
->type
== CHAN_X11
)) {
1971 logevent("X11 connection closed");
1972 assert(c
->u
.x11
.s
!= NULL
);
1973 x11_close(c
->u
.x11
.s
);
1976 c
->closes
|= closetype
;
1977 if (c
->closes
== 3) {
1978 del234(ssh_channels
, c
);
1982 } else if (pktin
.type
== SSH1_MSG_CHANNEL_DATA
) {
1983 /* Data sent down one of our channels. */
1984 int i
= GET_32BIT(pktin
.body
);
1985 int len
= GET_32BIT(pktin
.body
+4);
1986 unsigned char *p
= pktin
.body
+8;
1987 struct ssh_channel
*c
;
1988 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
1992 x11_send(c
->u
.x11
.s
, p
, len
);
1995 /* Data for an agent message. Buffer it. */
1997 if (c
->u
.a
.lensofar
< 4) {
1998 int l
= min(4 - c
->u
.a
.lensofar
, len
);
1999 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
, p
, l
);
2000 p
+= l
; len
-= l
; c
->u
.a
.lensofar
+= l
;
2002 if (c
->u
.a
.lensofar
== 4) {
2003 c
->u
.a
.totallen
= 4 + GET_32BIT(c
->u
.a
.msglen
);
2004 c
->u
.a
.message
= smalloc(c
->u
.a
.totallen
);
2005 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
2007 if (c
->u
.a
.lensofar
>= 4 && len
> 0) {
2008 int l
= min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
, len
);
2009 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
, p
, l
);
2010 p
+= l
; len
-= l
; c
->u
.a
.lensofar
+= l
;
2012 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
2013 void *reply
, *sentreply
;
2015 agent_query(c
->u
.a
.message
, c
->u
.a
.totallen
,
2020 /* Fake SSH_AGENT_FAILURE. */
2021 sentreply
= "\0\0\0\1\5";
2024 send_packet(SSH1_MSG_CHANNEL_DATA
,
2025 PKT_INT
, c
->remoteid
,
2027 PKT_DATA
, sentreply
, replylen
,
2031 sfree(c
->u
.a
.message
);
2032 c
->u
.a
.lensofar
= 0;
2038 } else if (pktin
.type
== SSH1_SMSG_SUCCESS
) {
2039 /* may be from EXEC_SHELL on some servers */
2040 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
2041 /* may be from EXEC_SHELL on some servers
2042 * if no pty is available or in other odd cases. Ignore */
2043 } else if (pktin
.type
== SSH1_SMSG_EXIT_STATUS
) {
2044 send_packet(SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
2046 bombout(("Strange packet received: type %d", pktin
.type
));
2051 int len
= min(inlen
, 512);
2052 send_packet(SSH1_CMSG_STDIN_DATA
,
2053 PKT_INT
, len
, PKT_DATA
, in
, len
, PKT_END
);
2064 * Utility routine for decoding comma-separated strings in KEXINIT.
2066 static int in_commasep_string(char *needle
, char *haystack
, int haylen
) {
2067 int needlen
= strlen(needle
);
2070 * Is it at the start of the string?
2072 if (haylen
>= needlen
&& /* haystack is long enough */
2073 !memcmp(needle
, haystack
, needlen
) && /* initial match */
2074 (haylen
== needlen
|| haystack
[needlen
] == ',')
2075 /* either , or EOS follows */
2079 * If not, search for the next comma and resume after that.
2080 * If no comma found, terminate.
2082 while (haylen
> 0 && *haystack
!= ',')
2083 haylen
--, haystack
++;
2086 haylen
--, haystack
++; /* skip over comma itself */
2091 * SSH2 key creation method.
2093 static void ssh2_mkkey(Bignum K
, char *H
, char chr
, char *keyspace
) {
2095 /* First 20 bytes. */
2098 SHA_Bytes(&s
, H
, 20);
2099 SHA_Bytes(&s
, &chr
, 1);
2100 SHA_Bytes(&s
, H
, 20);
2101 SHA_Final(&s
, keyspace
);
2102 /* Next 20 bytes. */
2105 SHA_Bytes(&s
, H
, 20);
2106 SHA_Bytes(&s
, keyspace
, 20);
2107 SHA_Final(&s
, keyspace
+20);
2111 * Handle the SSH2 transport layer.
2113 static int do_ssh2_transport(unsigned char *in
, int inlen
, int ispkt
)
2117 static Bignum e
, f
, K
;
2118 static const struct ssh_mac
**maclist
;
2120 static const struct ssh_cipher
*cscipher_tobe
= NULL
;
2121 static const struct ssh_cipher
*sccipher_tobe
= NULL
;
2122 static const struct ssh_mac
*csmac_tobe
= NULL
;
2123 static const struct ssh_mac
*scmac_tobe
= NULL
;
2124 static const struct ssh_compress
*cscomp_tobe
= NULL
;
2125 static const struct ssh_compress
*sccomp_tobe
= NULL
;
2126 static char *hostkeydata
, *sigdata
, *keystr
, *fingerprint
;
2127 static int hostkeylen
, siglen
;
2128 static void *hkey
; /* actual host key */
2129 static unsigned char exchange_hash
[20];
2130 static unsigned char keyspace
[40];
2131 static const struct ssh_cipher
*preferred_cipher
;
2132 static const struct ssh_compress
*preferred_comp
;
2133 static int first_kex
;
2140 * Set up the preferred cipher and compression.
2142 if (cfg
.cipher
== CIPHER_BLOWFISH
) {
2143 preferred_cipher
= &ssh_blowfish_ssh2
;
2144 } else if (cfg
.cipher
== CIPHER_DES
) {
2145 logevent("Single DES not supported in SSH2; using 3DES");
2146 preferred_cipher
= &ssh_3des_ssh2
;
2147 } else if (cfg
.cipher
== CIPHER_3DES
) {
2148 preferred_cipher
= &ssh_3des_ssh2
;
2150 /* Shouldn't happen, but we do want to initialise to _something_. */
2151 preferred_cipher
= &ssh_3des_ssh2
;
2153 if (cfg
.compression
)
2154 preferred_comp
= &ssh_zlib
;
2156 preferred_comp
= &ssh_comp_none
;
2159 * Be prepared to work around the buggy MAC problem.
2162 maclist
= buggymacs
, nmacs
= lenof(buggymacs
);
2164 maclist
= macs
, nmacs
= lenof(macs
);
2168 * Construct and send our key exchange packet.
2170 ssh2_pkt_init(SSH2_MSG_KEXINIT
);
2171 for (i
= 0; i
< 16; i
++)
2172 ssh2_pkt_addbyte((unsigned char)random_byte());
2173 /* List key exchange algorithms. */
2174 ssh2_pkt_addstring_start();
2175 for (i
= 0; i
< lenof(kex_algs
); i
++) {
2176 ssh2_pkt_addstring_str(kex_algs
[i
]->name
);
2177 if (i
< lenof(kex_algs
)-1)
2178 ssh2_pkt_addstring_str(",");
2180 /* List server host key algorithms. */
2181 ssh2_pkt_addstring_start();
2182 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
2183 ssh2_pkt_addstring_str(hostkey_algs
[i
]->name
);
2184 if (i
< lenof(hostkey_algs
)-1)
2185 ssh2_pkt_addstring_str(",");
2187 /* List client->server encryption algorithms. */
2188 ssh2_pkt_addstring_start();
2189 for (i
= 0; i
< lenof(ciphers
)+1; i
++) {
2190 const struct ssh_cipher
*c
= i
==0 ? preferred_cipher
: ciphers
[i
-1];
2191 ssh2_pkt_addstring_str(c
->name
);
2192 if (i
< lenof(ciphers
))
2193 ssh2_pkt_addstring_str(",");
2195 /* List server->client encryption algorithms. */
2196 ssh2_pkt_addstring_start();
2197 for (i
= 0; i
< lenof(ciphers
)+1; i
++) {
2198 const struct ssh_cipher
*c
= i
==0 ? preferred_cipher
: ciphers
[i
-1];
2199 ssh2_pkt_addstring_str(c
->name
);
2200 if (i
< lenof(ciphers
))
2201 ssh2_pkt_addstring_str(",");
2203 /* List client->server MAC algorithms. */
2204 ssh2_pkt_addstring_start();
2205 for (i
= 0; i
< nmacs
; i
++) {
2206 ssh2_pkt_addstring_str(maclist
[i
]->name
);
2208 ssh2_pkt_addstring_str(",");
2210 /* List server->client MAC algorithms. */
2211 ssh2_pkt_addstring_start();
2212 for (i
= 0; i
< nmacs
; i
++) {
2213 ssh2_pkt_addstring_str(maclist
[i
]->name
);
2215 ssh2_pkt_addstring_str(",");
2217 /* List client->server compression algorithms. */
2218 ssh2_pkt_addstring_start();
2219 for (i
= 0; i
< lenof(compressions
)+1; i
++) {
2220 const struct ssh_compress
*c
= i
==0 ? preferred_comp
: compressions
[i
-1];
2221 ssh2_pkt_addstring_str(c
->name
);
2222 if (i
< lenof(compressions
))
2223 ssh2_pkt_addstring_str(",");
2225 /* List server->client compression algorithms. */
2226 ssh2_pkt_addstring_start();
2227 for (i
= 0; i
< lenof(compressions
)+1; i
++) {
2228 const struct ssh_compress
*c
= i
==0 ? preferred_comp
: compressions
[i
-1];
2229 ssh2_pkt_addstring_str(c
->name
);
2230 if (i
< lenof(compressions
))
2231 ssh2_pkt_addstring_str(",");
2233 /* List client->server languages. Empty list. */
2234 ssh2_pkt_addstring_start();
2235 /* List server->client languages. Empty list. */
2236 ssh2_pkt_addstring_start();
2237 /* First KEX packet does _not_ follow, because we're not that brave. */
2238 ssh2_pkt_addbool(FALSE
);
2240 ssh2_pkt_adduint32(0);
2242 exhash
= exhashbase
;
2243 sha_string(&exhash
, pktout
.data
+5, pktout
.length
-5);
2247 if (!ispkt
) crWaitUntil(ispkt
);
2248 sha_string(&exhash
, pktin
.data
+5, pktin
.length
-5);
2251 * Now examine the other side's KEXINIT to see what we're up
2254 if (pktin
.type
!= SSH2_MSG_KEXINIT
) {
2255 bombout(("expected key exchange packet from server"));
2258 kex
= NULL
; hostkey
= NULL
; cscipher_tobe
= NULL
; sccipher_tobe
= NULL
;
2259 csmac_tobe
= NULL
; scmac_tobe
= NULL
; cscomp_tobe
= NULL
; sccomp_tobe
= NULL
;
2260 pktin
.savedpos
+= 16; /* skip garbage cookie */
2261 ssh2_pkt_getstring(&str
, &len
); /* key exchange algorithms */
2262 for (i
= 0; i
< lenof(kex_algs
); i
++) {
2263 if (in_commasep_string(kex_algs
[i
]->name
, str
, len
)) {
2268 ssh2_pkt_getstring(&str
, &len
); /* host key algorithms */
2269 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
2270 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
2271 hostkey
= hostkey_algs
[i
];
2275 ssh2_pkt_getstring(&str
, &len
); /* client->server cipher */
2276 for (i
= 0; i
< lenof(ciphers
)+1; i
++) {
2277 const struct ssh_cipher
*c
= i
==0 ? preferred_cipher
: ciphers
[i
-1];
2278 if (in_commasep_string(c
->name
, str
, len
)) {
2283 ssh2_pkt_getstring(&str
, &len
); /* server->client cipher */
2284 for (i
= 0; i
< lenof(ciphers
)+1; i
++) {
2285 const struct ssh_cipher
*c
= i
==0 ? preferred_cipher
: ciphers
[i
-1];
2286 if (in_commasep_string(c
->name
, str
, len
)) {
2291 ssh2_pkt_getstring(&str
, &len
); /* client->server mac */
2292 for (i
= 0; i
< nmacs
; i
++) {
2293 if (in_commasep_string(maclist
[i
]->name
, str
, len
)) {
2294 csmac_tobe
= maclist
[i
];
2298 ssh2_pkt_getstring(&str
, &len
); /* server->client mac */
2299 for (i
= 0; i
< nmacs
; i
++) {
2300 if (in_commasep_string(maclist
[i
]->name
, str
, len
)) {
2301 scmac_tobe
= maclist
[i
];
2305 ssh2_pkt_getstring(&str
, &len
); /* client->server compression */
2306 for (i
= 0; i
< lenof(compressions
)+1; i
++) {
2307 const struct ssh_compress
*c
= i
==0 ? preferred_comp
: compressions
[i
-1];
2308 if (in_commasep_string(c
->name
, str
, len
)) {
2313 ssh2_pkt_getstring(&str
, &len
); /* server->client compression */
2314 for (i
= 0; i
< lenof(compressions
)+1; i
++) {
2315 const struct ssh_compress
*c
= i
==0 ? preferred_comp
: compressions
[i
-1];
2316 if (in_commasep_string(c
->name
, str
, len
)) {
2323 * Currently we only support Diffie-Hellman and DSS, so let's
2324 * bomb out if those aren't selected.
2326 if (kex
!= &ssh_diffiehellman
|| hostkey
!= &ssh_dss
) {
2327 bombout(("internal fault: chaos in SSH 2 transport layer"));
2332 * Now we begin the fun. Generate and send e for Diffie-Hellman.
2335 ssh2_pkt_init(SSH2_MSG_KEXDH_INIT
);
2340 if (pktin
.type
!= SSH2_MSG_KEXDH_REPLY
) {
2341 bombout(("expected key exchange packet from server"));
2344 ssh2_pkt_getstring(&hostkeydata
, &hostkeylen
);
2345 f
= ssh2_pkt_getmp();
2346 ssh2_pkt_getstring(&sigdata
, &siglen
);
2350 sha_string(&exhash
, hostkeydata
, hostkeylen
);
2351 sha_mpint(&exhash
, e
);
2352 sha_mpint(&exhash
, f
);
2353 sha_mpint(&exhash
, K
);
2354 SHA_Final(&exhash
, exchange_hash
);
2357 debug(("Exchange hash is:\r\n"));
2358 for (i
= 0; i
< 20; i
++)
2359 debug((" %02x", exchange_hash
[i
]));
2363 hkey
= hostkey
->newkey(hostkeydata
, hostkeylen
);
2364 if (!hostkey
->verifysig(hkey
, sigdata
, siglen
, exchange_hash
, 20)) {
2365 bombout(("Server failed host key check"));
2370 * Expect SSH2_MSG_NEWKEYS from server.
2373 if (pktin
.type
!= SSH2_MSG_NEWKEYS
) {
2374 bombout(("expected new-keys packet from server"));
2379 * Authenticate remote host: verify host key. (We've already
2380 * checked the signature of the exchange hash.)
2382 keystr
= hostkey
->fmtkey(hkey
);
2383 fingerprint
= hostkey
->fingerprint(hkey
);
2384 verify_ssh_host_key(savedhost
, savedport
, hostkey
->keytype
,
2385 keystr
, fingerprint
);
2386 logevent("Host key fingerprint is:");
2387 logevent(fingerprint
);
2390 hostkey
->freekey(hkey
);
2393 * Send SSH2_MSG_NEWKEYS.
2395 ssh2_pkt_init(SSH2_MSG_NEWKEYS
);
2399 * Create and initialise session keys.
2401 cscipher
= cscipher_tobe
;
2402 sccipher
= sccipher_tobe
;
2405 cscomp
= cscomp_tobe
;
2406 sccomp
= sccomp_tobe
;
2407 cscomp
->compress_init();
2408 sccomp
->decompress_init();
2410 * Set IVs after keys.
2412 ssh2_mkkey(K
, exchange_hash
, 'C', keyspace
); cscipher
->setcskey(keyspace
);
2413 ssh2_mkkey(K
, exchange_hash
, 'D', keyspace
); sccipher
->setsckey(keyspace
);
2414 ssh2_mkkey(K
, exchange_hash
, 'A', keyspace
); cscipher
->setcsiv(keyspace
);
2415 ssh2_mkkey(K
, exchange_hash
, 'B', keyspace
); sccipher
->setsciv(keyspace
);
2416 ssh2_mkkey(K
, exchange_hash
, 'E', keyspace
); csmac
->setcskey(keyspace
);
2417 ssh2_mkkey(K
, exchange_hash
, 'F', keyspace
); scmac
->setsckey(keyspace
);
2420 * If this is the first key exchange phase, we must pass the
2421 * SSH2_MSG_NEWKEYS packet to the next layer, not because it
2422 * wants to see it but because it will need time to initialise
2423 * itself before it sees an actual packet. In subsequent key
2424 * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because
2425 * it would only confuse the layer above.
2433 * Now we're encrypting. Begin returning 1 to the protocol main
2434 * function so that other things can run on top of the
2435 * transport. If we ever see a KEXINIT, we must go back to the
2440 } while (!(ispkt
&& pktin
.type
== SSH2_MSG_KEXINIT
));
2441 goto begin_key_exchange
;
2447 * Add data to an SSH2 channel output buffer.
2449 static void ssh2_add_channel_data(struct ssh_channel
*c
, char *buf
, int len
) {
2450 if (c
->v2
.outbufsize
<
2451 c
->v2
.outbuflen
+ len
) {
2453 c
->v2
.outbuflen
+ len
+ 1024;
2454 c
->v2
.outbuffer
= srealloc(c
->v2
.outbuffer
,
2457 memcpy(c
->v2
.outbuffer
+ c
->v2
.outbuflen
,
2459 c
->v2
.outbuflen
+= len
;
2463 * Attempt to send data on an SSH2 channel.
2465 static void ssh2_try_send(struct ssh_channel
*c
) {
2466 while (c
->v2
.remwindow
> 0 &&
2467 c
->v2
.outbuflen
> 0) {
2468 unsigned len
= c
->v2
.remwindow
;
2469 if (len
> c
->v2
.outbuflen
)
2470 len
= c
->v2
.outbuflen
;
2471 if (len
> c
->v2
.remmaxpkt
)
2472 len
= c
->v2
.remmaxpkt
;
2473 ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA
);
2474 ssh2_pkt_adduint32(c
->remoteid
);
2475 ssh2_pkt_addstring_start();
2476 ssh2_pkt_addstring_data(c
->v2
.outbuffer
, len
);
2478 c
->v2
.outbuflen
-= len
;
2479 memmove(c
->v2
.outbuffer
, c
->v2
.outbuffer
+len
,
2481 c
->v2
.remwindow
-= len
;
2486 * Handle the SSH2 userauth and connection layers.
2488 static void do_ssh2_authconn(unsigned char *in
, int inlen
, int ispkt
)
2490 static unsigned long remote_winsize
;
2491 static unsigned long remote_maxpkt
;
2496 * Request userauth protocol, and await a response to it.
2498 ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST
);
2499 ssh2_pkt_addstring("ssh-userauth");
2501 crWaitUntilV(ispkt
);
2502 if (pktin
.type
!= SSH2_MSG_SERVICE_ACCEPT
) {
2503 bombout(("Server refused user authentication protocol"));
2508 * FIXME: currently we support only password authentication.
2509 * (This places us technically in violation of the SSH2 spec.
2510 * We must fix this.)
2514 * Get a username and a password.
2516 static char username
[100];
2517 static char password
[100];
2521 if ((flags
& FLAG_INTERACTIVE
) && !*cfg
.username
) {
2522 c_write("login as: ", 10);
2525 crWaitUntilV(!ispkt
);
2526 while (inlen
--) switch (c
= *in
++) {
2533 c_write("\b \b", 3);
2539 c_write("\b \b", 3);
2548 if (((c
>= ' ' && c
<= '~') ||
2549 ((unsigned char)c
>= 160)) && pos
< 40) {
2550 username
[pos
++] = c
;
2557 username
[strcspn(username
, "\n\r")] = '\0';
2560 strncpy(username
, cfg
.username
, 99);
2561 username
[99] = '\0';
2562 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
2563 sprintf(stuff
, "Using username \"%s\".\r\n", username
);
2564 c_write(stuff
, strlen(stuff
));
2568 if (ssh_get_password
) {
2570 sprintf(prompt
, "%.90s@%.90s's password: ", username
, savedhost
);
2571 if (!ssh_get_password(prompt
, password
, sizeof(password
))) {
2573 * get_password failed to get a password (for
2574 * example because one was supplied on the command
2575 * line which has already failed to work).
2578 logevent("No more passwords to try");
2579 ssh_state
= SSH_STATE_CLOSED
;
2583 c_write("password: ", 10);
2588 crWaitUntilV(!ispkt
);
2589 while (inlen
--) switch (c
= *in
++) {
2606 if (((c
>= ' ' && c
<= '~') ||
2607 ((unsigned char)c
>= 160)) && pos
< 40)
2608 password
[pos
++] = c
;
2615 ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
2616 ssh2_pkt_addstring(username
);
2617 ssh2_pkt_addstring("ssh-connection"); /* service requested */
2618 ssh2_pkt_addstring("password");
2619 ssh2_pkt_addbool(FALSE
);
2620 ssh2_pkt_addstring(password
);
2623 crWaitUntilV(ispkt
);
2624 if (pktin
.type
!= SSH2_MSG_USERAUTH_SUCCESS
) {
2625 c_write("Access denied\r\n", 15);
2626 logevent("Authentication refused");
2632 * Now we're authenticated for the connection protocol. The
2633 * connection protocol will automatically have started at this
2634 * point; there's no need to send SERVICE_REQUEST.
2638 * So now create a channel with a session in it.
2640 mainchan
= smalloc(sizeof(struct ssh_channel
));
2641 mainchan
->localid
= 100; /* as good as any */
2642 ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
2643 ssh2_pkt_addstring("session");
2644 ssh2_pkt_adduint32(mainchan
->localid
);
2645 ssh2_pkt_adduint32(0x8000UL
); /* our window size */
2646 ssh2_pkt_adduint32(0x4000UL
); /* our max pkt size */
2648 crWaitUntilV(ispkt
);
2649 if (pktin
.type
!= SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
2650 bombout(("Server refused to open a session"));
2652 /* FIXME: error data comes back in FAILURE packet */
2654 if (ssh2_pkt_getuint32() != mainchan
->localid
) {
2655 bombout(("Server's channel confirmation cited wrong channel"));
2658 mainchan
->remoteid
= ssh2_pkt_getuint32();
2659 mainchan
->type
= CHAN_MAINSESSION
;
2660 mainchan
->closes
= 0;
2661 mainchan
->v2
.remwindow
= ssh2_pkt_getuint32();
2662 mainchan
->v2
.remmaxpkt
= ssh2_pkt_getuint32();
2663 mainchan
->v2
.outbuffer
= NULL
;
2664 mainchan
->v2
.outbuflen
= mainchan
->v2
.outbufsize
= 0;
2665 ssh_channels
= newtree234(ssh_channelcmp
);
2666 add234(ssh_channels
, mainchan
);
2667 logevent("Opened channel for session");
2670 * Potentially enable X11 forwarding.
2672 if (cfg
.x11_forward
) {
2673 char proto
[20], data
[64];
2674 logevent("Requesting X11 forwarding");
2675 x11_invent_auth(proto
, sizeof(proto
), data
, sizeof(data
));
2676 ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
2677 ssh2_pkt_adduint32(mainchan
->remoteid
);
2678 ssh2_pkt_addstring("x11-req");
2679 ssh2_pkt_addbool(1); /* want reply */
2680 ssh2_pkt_addbool(0); /* many connections */
2681 ssh2_pkt_addstring(proto
);
2682 ssh2_pkt_addstring(data
);
2683 ssh2_pkt_adduint32(0); /* screen number */
2687 crWaitUntilV(ispkt
);
2688 if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2689 unsigned i
= ssh2_pkt_getuint32();
2690 struct ssh_channel
*c
;
2691 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
2693 continue; /* nonexistent channel */
2694 c
->v2
.remwindow
+= ssh2_pkt_getuint32();
2696 } while (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2698 if (pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
2699 if (pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
2700 bombout(("Server got confused by X11 forwarding request"));
2703 logevent("X11 forwarding refused");
2705 logevent("X11 forwarding enabled");
2706 ssh_X11_fwd_enabled
= TRUE
;
2711 * Now allocate a pty for the session.
2714 ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
2715 ssh2_pkt_adduint32(mainchan
->remoteid
); /* recipient channel */
2716 ssh2_pkt_addstring("pty-req");
2717 ssh2_pkt_addbool(1); /* want reply */
2718 ssh2_pkt_addstring(cfg
.termtype
);
2719 ssh2_pkt_adduint32(cols
);
2720 ssh2_pkt_adduint32(rows
);
2721 ssh2_pkt_adduint32(0); /* pixel width */
2722 ssh2_pkt_adduint32(0); /* pixel height */
2723 ssh2_pkt_addstring_start();
2724 ssh2_pkt_addstring_data("\0", 1);/* TTY_OP_END, no special options */
2726 ssh_state
= SSH_STATE_INTERMED
;
2729 crWaitUntilV(ispkt
);
2730 if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2731 unsigned i
= ssh2_pkt_getuint32();
2732 struct ssh_channel
*c
;
2733 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
2735 continue; /* nonexistent channel */
2736 c
->v2
.remwindow
+= ssh2_pkt_getuint32();
2738 } while (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2740 if (pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
2741 if (pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
2742 bombout(("Server got confused by pty request"));
2745 c_write("Server refused to allocate pty\r\n", 32);
2747 logevent("Allocated pty");
2752 * Start a shell or a remote command.
2754 ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
2755 ssh2_pkt_adduint32(mainchan
->remoteid
); /* recipient channel */
2756 if (*cfg
.remote_cmd
) {
2757 ssh2_pkt_addstring("exec");
2758 ssh2_pkt_addbool(1); /* want reply */
2759 ssh2_pkt_addstring(cfg
.remote_cmd
);
2761 ssh2_pkt_addstring("shell");
2762 ssh2_pkt_addbool(1); /* want reply */
2766 crWaitUntilV(ispkt
);
2767 if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2768 unsigned i
= ssh2_pkt_getuint32();
2769 struct ssh_channel
*c
;
2770 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
2772 continue; /* nonexistent channel */
2773 c
->v2
.remwindow
+= ssh2_pkt_getuint32();
2775 } while (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2776 if (pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
2777 if (pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
2778 bombout(("Server got confused by shell/command request"));
2781 bombout(("Server refused to start a shell/command"));
2784 logevent("Started a shell/command");
2787 ssh_state
= SSH_STATE_SESSION
;
2791 ssh_special(TS_EOF
);
2799 static int try_send
;
2803 if (pktin
.type
== SSH2_MSG_CHANNEL_DATA
||
2804 pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
) {
2807 unsigned i
= ssh2_pkt_getuint32();
2808 struct ssh_channel
*c
;
2809 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
2811 continue; /* nonexistent channel */
2812 if (pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
&&
2813 ssh2_pkt_getuint32() != SSH2_EXTENDED_DATA_STDERR
)
2814 continue; /* extended but not stderr */
2815 ssh2_pkt_getstring(&data
, &length
);
2818 case CHAN_MAINSESSION
:
2819 from_backend(pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
,
2823 x11_send(c
->u
.x11
.s
, data
, length
);
2827 * Enlarge the window again at the remote
2828 * side, just in case it ever runs down and
2829 * they fail to send us any more data.
2831 ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2832 ssh2_pkt_adduint32(c
->remoteid
);
2833 ssh2_pkt_adduint32(length
);
2836 } else if (pktin
.type
== SSH2_MSG_DISCONNECT
) {
2837 ssh_state
= SSH_STATE_CLOSED
;
2838 logevent("Received disconnect message");
2840 } else if (pktin
.type
== SSH2_MSG_CHANNEL_REQUEST
) {
2841 continue; /* exit status et al; ignore (FIXME?) */
2842 } else if (pktin
.type
== SSH2_MSG_CHANNEL_EOF
) {
2843 unsigned i
= ssh2_pkt_getuint32();
2844 struct ssh_channel
*c
;
2846 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
2848 continue; /* nonexistent channel */
2850 if (c
->type
== CHAN_X11
) {
2852 * Remote EOF on an X11 channel means we should
2853 * wrap up and close the channel ourselves.
2855 x11_close(c
->u
.x11
.s
);
2858 } else if (pktin
.type
== SSH2_MSG_CHANNEL_CLOSE
) {
2859 unsigned i
= ssh2_pkt_getuint32();
2860 struct ssh_channel
*c
;
2863 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
2865 continue; /* nonexistent channel */
2866 if (c
->closes
== 0) {
2867 ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
2868 ssh2_pkt_adduint32(c
->remoteid
);
2871 /* Do pre-close processing on the channel. */
2873 case CHAN_MAINSESSION
:
2874 break; /* nothing to see here, move along */
2878 del234(ssh_channels
, c
);
2879 sfree(c
->v2
.outbuffer
);
2883 * See if that was the last channel left open.
2885 c
= first234(ssh_channels
, &e
);
2887 logevent("All channels closed. Disconnecting");
2888 ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
2889 ssh2_pkt_adduint32(SSH2_DISCONNECT_BY_APPLICATION
);
2890 ssh2_pkt_addstring("All open channels closed");
2891 ssh2_pkt_addstring("en"); /* language tag */
2893 ssh_state
= SSH_STATE_CLOSED
;
2896 continue; /* remote sends close; ignore (FIXME) */
2897 } else if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2898 unsigned i
= ssh2_pkt_getuint32();
2899 struct ssh_channel
*c
;
2900 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
2902 continue; /* nonexistent channel */
2903 mainchan
->v2
.remwindow
+= ssh2_pkt_getuint32();
2905 } else if (pktin
.type
== SSH2_MSG_CHANNEL_OPEN
) {
2909 struct ssh_channel
*c
;
2910 ssh2_pkt_getstring(&type
, &typelen
);
2911 c
= smalloc(sizeof(struct ssh_channel
));
2913 if (typelen
== 3 && !memcmp(type
, "x11", 3)) {
2914 if (!ssh_X11_fwd_enabled
)
2915 error
= "X11 forwarding is not enabled";
2916 else if ( x11_init(&c
->u
.x11
.s
, cfg
.x11_display
, c
) != NULL
) {
2917 error
= "Unable to open an X11 connection";
2922 error
= "Unsupported channel type requested";
2925 c
->remoteid
= ssh2_pkt_getuint32();
2927 ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_FAILURE
);
2928 ssh2_pkt_adduint32(c
->remoteid
);
2929 ssh2_pkt_adduint32(SSH2_OPEN_CONNECT_FAILED
);
2930 ssh2_pkt_addstring(error
);
2931 ssh2_pkt_addstring("en"); /* language tag */
2935 struct ssh_channel
*d
;
2939 for (i
=1, d
= first234(ssh_channels
, &e
); d
;
2942 break; /* found a free number */
2947 c
->v2
.remwindow
= ssh2_pkt_getuint32();
2948 c
->v2
.remmaxpkt
= ssh2_pkt_getuint32();
2949 c
->v2
.outbuffer
= NULL
;
2950 c
->v2
.outbuflen
= c
->v2
.outbufsize
= 0;
2951 add234(ssh_channels
, c
);
2952 ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
);
2953 ssh2_pkt_adduint32(c
->remoteid
);
2954 ssh2_pkt_adduint32(c
->localid
);
2955 ssh2_pkt_adduint32(0x8000UL
); /* our window size */
2956 ssh2_pkt_adduint32(0x4000UL
); /* our max pkt size */
2960 bombout(("Strange packet received: type %d", pktin
.type
));
2965 * We have spare data. Add it to the channel buffer.
2967 ssh2_add_channel_data(mainchan
, in
, inlen
);
2972 struct ssh_channel
*c
;
2974 * Try to send data on all channels if we can.
2976 for (c
= first234(ssh_channels
, &e
); c
; c
= next234(&e
))
2985 * Handle the top-level SSH2 protocol.
2987 static void ssh2_protocol(unsigned char *in
, int inlen
, int ispkt
)
2989 if (do_ssh2_transport(in
, inlen
, ispkt
) == 0)
2991 do_ssh2_authconn(in
, inlen
, ispkt
);
2995 * Called to set up the connection.
2997 * Returns an error message, or NULL on success.
2999 static char *ssh_init (char *host
, int port
, char **realhost
) {
3003 if(crypto_startup() == 0)
3004 return "Microsoft high encryption pack not installed!";
3009 p
= connect_to_host(host
, port
, realhost
);
3017 * Called to send data down the Telnet connection.
3019 static void ssh_send (char *buf
, int len
) {
3020 if (s
== NULL
|| ssh_protocol
== NULL
)
3023 ssh_protocol(buf
, len
, 0);
3027 * Called to set the size of the window from SSH's POV.
3029 static void ssh_size(void) {
3030 switch (ssh_state
) {
3031 case SSH_STATE_BEFORE_SIZE
:
3032 case SSH_STATE_PREPACKET
:
3033 case SSH_STATE_CLOSED
:
3034 break; /* do nothing */
3035 case SSH_STATE_INTERMED
:
3036 size_needed
= TRUE
; /* buffer for later */
3038 case SSH_STATE_SESSION
:
3040 if (ssh_version
== 1) {
3041 send_packet(SSH1_CMSG_WINDOW_SIZE
,
3042 PKT_INT
, rows
, PKT_INT
, cols
,
3043 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
3045 ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
3046 ssh2_pkt_adduint32(mainchan
->remoteid
);
3047 ssh2_pkt_addstring("window-change");
3048 ssh2_pkt_addbool(0);
3049 ssh2_pkt_adduint32(cols
);
3050 ssh2_pkt_adduint32(rows
);
3051 ssh2_pkt_adduint32(0);
3052 ssh2_pkt_adduint32(0);
3061 * Send Telnet special codes. TS_EOF is useful for `plink', so you
3062 * can send an EOF and collect resulting output (e.g. `plink
3065 static void ssh_special (Telnet_Special code
) {
3066 if (code
== TS_EOF
) {
3067 if (ssh_state
!= SSH_STATE_SESSION
) {
3069 * Buffer the EOF in case we are pre-SESSION, so we can
3070 * send it as soon as we reach SESSION.
3076 if (ssh_version
== 1) {
3077 send_packet(SSH1_CMSG_EOF
, PKT_END
);
3079 ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF
);
3080 ssh2_pkt_adduint32(mainchan
->remoteid
);
3083 logevent("Sent EOF message");
3084 } else if (code
== TS_PING
) {
3085 if (ssh_state
== SSH_STATE_CLOSED
|| ssh_state
== SSH_STATE_PREPACKET
)
3087 if (ssh_version
== 1) {
3088 send_packet(SSH1_MSG_IGNORE
, PKT_STR
, "", PKT_END
);
3090 ssh2_pkt_init(SSH2_MSG_IGNORE
);
3091 ssh2_pkt_addstring_start();
3099 static Socket
ssh_socket(void) { return s
; }
3101 static int ssh_sendok(void) { return ssh_send_ok
; }
3103 Backend ssh_backend
= {