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 *, char **);
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
};
215 * 2-3-4 tree storing channels.
218 unsigned remoteid
, localid
;
222 struct ssh_agent_channel
{
223 unsigned char *message
;
224 unsigned char msglen
[4];
225 int lensofar
, totallen
;
227 struct ssh_x11_channel
{
230 struct ssh2_data_channel
{
231 unsigned char *outbuffer
;
232 unsigned outbuflen
, outbufsize
;
233 unsigned remwindow
, remmaxpkt
;
247 static SHA_State exhash
, exhashbase
;
249 static Socket s
= NULL
;
251 static unsigned char session_key
[32];
252 static int ssh1_compressing
;
253 static int ssh_agentfwd_enabled
;
254 static int ssh_X11_fwd_enabled
;
255 static const struct ssh_cipher
*cipher
= NULL
;
256 static const struct ssh_cipher
*cscipher
= NULL
;
257 static const struct ssh_cipher
*sccipher
= NULL
;
258 static const struct ssh_mac
*csmac
= NULL
;
259 static const struct ssh_mac
*scmac
= NULL
;
260 static const struct ssh_compress
*cscomp
= NULL
;
261 static const struct ssh_compress
*sccomp
= NULL
;
262 static const struct ssh_kex
*kex
= NULL
;
263 static const struct ssh_signkey
*hostkey
= NULL
;
264 int (*ssh_get_password
)(const char *prompt
, char *str
, int maxlen
) = NULL
;
266 static char *savedhost
;
267 static int savedport
;
268 static int ssh_send_ok
;
270 static tree234
*ssh_channels
; /* indexed by local id */
271 static struct ssh_channel
*mainchan
; /* primary session channel */
275 SSH_STATE_BEFORE_SIZE
,
279 } ssh_state
= SSH_STATE_PREPACKET
;
281 static int size_needed
= FALSE
, eof_needed
= FALSE
;
283 static struct Packet pktin
= { 0, 0, NULL
, NULL
, 0 };
284 static struct Packet pktout
= { 0, 0, NULL
, NULL
, 0 };
286 static int ssh_version
;
287 static void (*ssh_protocol
)(unsigned char *in
, int inlen
, int ispkt
);
288 static void ssh1_protocol(unsigned char *in
, int inlen
, int ispkt
);
289 static void ssh2_protocol(unsigned char *in
, int inlen
, int ispkt
);
290 static void ssh_size(void);
291 static void ssh_special (Telnet_Special
);
293 static int (*s_rdpkt
)(unsigned char **data
, int *datalen
);
295 static struct rdpkt1_state_tag
{
296 long len
, pad
, biglen
, to_read
;
297 unsigned long realcrc
, gotcrc
;
303 static struct rdpkt2_state_tag
{
304 long len
, pad
, payload
, packetlen
, maclen
;
307 unsigned long incoming_sequence
;
310 static int ssh_channelcmp(void *av
, void *bv
) {
311 struct ssh_channel
*a
= (struct ssh_channel
*)av
;
312 struct ssh_channel
*b
= (struct ssh_channel
*)bv
;
313 if (a
->localid
< b
->localid
) return -1;
314 if (a
->localid
> b
->localid
) return +1;
317 static int ssh_channelfind(void *av
, void *bv
) {
318 unsigned *a
= (unsigned *)av
;
319 struct ssh_channel
*b
= (struct ssh_channel
*)bv
;
320 if (*a
< b
->localid
) return -1;
321 if (*a
> b
->localid
) return +1;
325 static void c_write (char *buf
, int len
) {
326 if ((flags
& FLAG_STDERR
)) {
328 for (i
= 0; i
< len
; i
++)
330 fputc(buf
[i
], stderr
);
333 from_backend(1, buf
, len
);
337 * Collect incoming data in the incoming packet buffer.
338 * Decipher and verify the packet when it is completely read.
339 * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets.
340 * Update the *data and *datalen variables.
341 * Return the additional nr of bytes needed, or 0 when
342 * a complete packet is available.
344 static int ssh1_rdpkt(unsigned char **data
, int *datalen
)
346 struct rdpkt1_state_tag
*st
= &rdpkt1_state
;
355 for (st
->i
= st
->len
= 0; st
->i
< 4; st
->i
++) {
356 while ((*datalen
) == 0)
358 st
->len
= (st
->len
<< 8) + **data
;
359 (*data
)++, (*datalen
)--;
363 if (st
->len
== 0x52656d6f) { /* "Remo"te server has closed ... */
364 st
->len
= 0x300; /* big enough to carry to end */
368 st
->pad
= 8 - (st
->len
% 8);
369 st
->biglen
= st
->len
+ st
->pad
;
370 pktin
.length
= st
->len
- 5;
372 if (pktin
.maxlen
< st
->biglen
) {
373 pktin
.maxlen
= st
->biglen
;
374 pktin
.data
= (pktin
.data
== NULL ?
smalloc(st
->biglen
+APIEXTRA
) :
375 srealloc(pktin
.data
, st
->biglen
+APIEXTRA
));
377 fatalbox("Out of memory");
380 st
->to_read
= st
->biglen
;
382 while (st
->to_read
> 0) {
383 st
->chunk
= st
->to_read
;
384 while ((*datalen
) == 0)
385 crReturn(st
->to_read
);
386 if (st
->chunk
> (*datalen
))
387 st
->chunk
= (*datalen
);
388 memcpy(st
->p
, *data
, st
->chunk
);
390 *datalen
-= st
->chunk
;
392 st
->to_read
-= st
->chunk
;
396 cipher
->decrypt(pktin
.data
, st
->biglen
);
398 debug(("Got packet len=%d pad=%d\r\n", st
->len
, st
->pad
));
399 for (st
->i
= 0; st
->i
< st
->biglen
; st
->i
++)
400 debug((" %02x", (unsigned char)pktin
.data
[st
->i
]));
404 st
->realcrc
= crc32(pktin
.data
, st
->biglen
-4);
405 st
->gotcrc
= GET_32BIT(pktin
.data
+st
->biglen
-4);
406 if (st
->gotcrc
!= st
->realcrc
) {
407 bombout(("Incorrect CRC received on packet"));
411 pktin
.body
= pktin
.data
+ st
->pad
+ 1;
413 if (ssh1_compressing
) {
414 unsigned char *decompblk
;
418 debug(("Packet payload pre-decompression:\n"));
419 for (i
= -1; i
< pktin
.length
; i
++)
420 debug((" %02x", (unsigned char)pktin
.body
[i
]));
423 zlib_decompress_block(pktin
.body
-1, pktin
.length
+1,
424 &decompblk
, &decomplen
);
426 if (pktin
.maxlen
< st
->pad
+ decomplen
) {
427 pktin
.maxlen
= st
->pad
+ decomplen
;
428 pktin
.data
= srealloc(pktin
.data
, pktin
.maxlen
+APIEXTRA
);
429 pktin
.body
= pktin
.data
+ st
->pad
+ 1;
431 fatalbox("Out of memory");
434 memcpy(pktin
.body
-1, decompblk
, decomplen
);
436 pktin
.length
= decomplen
-1;
438 debug(("Packet payload post-decompression:\n"));
439 for (i
= -1; i
< pktin
.length
; i
++)
440 debug((" %02x", (unsigned char)pktin
.body
[i
]));
445 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
446 pktin
.type
== SSH1_SMSG_STDERR_DATA
||
447 pktin
.type
== SSH1_MSG_DEBUG
||
448 pktin
.type
== SSH1_SMSG_AUTH_TIS_CHALLENGE
||
449 pktin
.type
== SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
450 long strlen
= GET_32BIT(pktin
.body
);
451 if (strlen
+ 4 != pktin
.length
) {
452 bombout(("Received data packet with bogus string length"));
457 pktin
.type
= pktin
.body
[-1];
459 if (pktin
.type
== SSH1_MSG_DEBUG
) {
460 /* log debug message */
462 int strlen
= GET_32BIT(pktin
.body
);
463 strcpy(buf
, "Remote: ");
464 if (strlen
> 70) strlen
= 70;
465 memcpy(buf
+8, pktin
.body
+4, strlen
);
466 buf
[8+strlen
] = '\0';
469 } else if (pktin
.type
== SSH1_MSG_IGNORE
) {
477 static int ssh2_rdpkt(unsigned char **data
, int *datalen
)
479 struct rdpkt2_state_tag
*st
= &rdpkt2_state
;
487 st
->cipherblk
= sccipher
->blksize
;
490 if (st
->cipherblk
< 8)
493 if (pktin
.maxlen
< st
->cipherblk
) {
494 pktin
.maxlen
= st
->cipherblk
;
495 pktin
.data
= (pktin
.data
== NULL ?
smalloc(st
->cipherblk
+APIEXTRA
) :
496 srealloc(pktin
.data
, st
->cipherblk
+APIEXTRA
));
498 fatalbox("Out of memory");
502 * Acquire and decrypt the first block of the packet. This will
503 * contain the length and padding details.
505 for (st
->i
= st
->len
= 0; st
->i
< st
->cipherblk
; st
->i
++) {
506 while ((*datalen
) == 0)
507 crReturn(st
->cipherblk
-st
->i
);
508 pktin
.data
[st
->i
] = *(*data
)++;
512 if (!memcmp(pktin
.data
, "Remo", 4)) {/* "Remo"te server has closed ... */
517 sccipher
->decrypt(pktin
.data
, st
->cipherblk
);
520 * Now get the length and padding figures.
522 st
->len
= GET_32BIT(pktin
.data
);
523 st
->pad
= pktin
.data
[4];
526 * This enables us to deduce the payload length.
528 st
->payload
= st
->len
- st
->pad
- 1;
530 pktin
.length
= st
->payload
+ 5;
533 * So now we can work out the total packet length.
535 st
->packetlen
= st
->len
+ 4;
536 st
->maclen
= scmac ? scmac
->len
: 0;
539 * Adjust memory allocation if packet is too big.
541 if (pktin
.maxlen
< st
->packetlen
+st
->maclen
) {
542 pktin
.maxlen
= st
->packetlen
+st
->maclen
;
543 pktin
.data
= (pktin
.data
== NULL ?
smalloc(pktin
.maxlen
+APIEXTRA
) :
544 srealloc(pktin
.data
, pktin
.maxlen
+APIEXTRA
));
546 fatalbox("Out of memory");
550 * Read and decrypt the remainder of the packet.
552 for (st
->i
= st
->cipherblk
; st
->i
< st
->packetlen
+ st
->maclen
; st
->i
++) {
553 while ((*datalen
) == 0)
554 crReturn(st
->packetlen
+ st
->maclen
- st
->i
);
555 pktin
.data
[st
->i
] = *(*data
)++;
558 /* Decrypt everything _except_ the MAC. */
560 sccipher
->decrypt(pktin
.data
+ st
->cipherblk
,
561 st
->packetlen
- st
->cipherblk
);
564 debug(("Got packet len=%d pad=%d\r\n", st
->len
, st
->pad
));
565 for (st
->i
= 0; st
->i
< st
->packetlen
; st
->i
++)
566 debug((" %02x", (unsigned char)pktin
.data
[st
->i
]));
573 if (scmac
&& !scmac
->verify(pktin
.data
, st
->len
+4, st
->incoming_sequence
)) {
574 bombout(("Incorrect MAC received on packet"));
577 st
->incoming_sequence
++; /* whether or not we MACed */
580 * Decompress packet payload.
583 unsigned char *newpayload
;
585 if (sccomp
&& sccomp
->decompress(pktin
.data
+5, pktin
.length
-5,
586 &newpayload
, &newlen
)) {
587 if (pktin
.maxlen
< newlen
+5) {
588 pktin
.maxlen
= newlen
+5;
589 pktin
.data
= (pktin
.data
== NULL ?
smalloc(pktin
.maxlen
+APIEXTRA
) :
590 srealloc(pktin
.data
, pktin
.maxlen
+APIEXTRA
));
592 fatalbox("Out of memory");
594 pktin
.length
= 5 + newlen
;
595 memcpy(pktin
.data
+5, newpayload
, newlen
);
597 debug(("Post-decompression payload:\r\n"));
598 for (st
->i
= 0; st
->i
< newlen
; st
->i
++)
599 debug((" %02x", (unsigned char)pktin
.data
[5+st
->i
]));
608 pktin
.type
= pktin
.data
[5];
610 if (pktin
.type
== SSH2_MSG_IGNORE
|| pktin
.type
== SSH2_MSG_DEBUG
)
611 goto next_packet
; /* FIXME: print DEBUG message */
616 static void ssh1_pktout_size(int len
) {
619 len
+= 5; /* type and CRC */
623 pktout
.length
= len
-5;
624 if (pktout
.maxlen
< biglen
) {
625 pktout
.maxlen
= biglen
;
627 /* Allocate enough buffer space for extra block
628 * for MS CryptEncrypt() */
629 pktout
.data
= (pktout
.data
== NULL ?
smalloc(biglen
+12) :
630 srealloc(pktout
.data
, biglen
+12));
632 pktout
.data
= (pktout
.data
== NULL ?
smalloc(biglen
+4) :
633 srealloc(pktout
.data
, biglen
+4));
636 fatalbox("Out of memory");
638 pktout
.body
= pktout
.data
+4+pad
+1;
641 static void s_wrpkt_start(int type
, int len
) {
642 ssh1_pktout_size(len
);
646 static void s_wrpkt(void) {
647 int pad
, len
, biglen
, i
;
650 pktout
.body
[-1] = pktout
.type
;
652 if (ssh1_compressing
) {
653 unsigned char *compblk
;
656 debug(("Packet payload pre-compression:\n"));
657 for (i
= -1; i
< pktout
.length
; i
++)
658 debug((" %02x", (unsigned char)pktout
.body
[i
]));
661 zlib_compress_block(pktout
.body
-1, pktout
.length
+1,
663 ssh1_pktout_size(complen
-1);
664 memcpy(pktout
.body
-1, compblk
, complen
);
667 debug(("Packet payload post-compression:\n"));
668 for (i
= -1; i
< pktout
.length
; i
++)
669 debug((" %02x", (unsigned char)pktout
.body
[i
]));
674 len
= pktout
.length
+ 5; /* type and CRC */
678 for (i
=0; i
<pad
; i
++)
679 pktout
.data
[i
+4] = random_byte();
680 crc
= crc32(pktout
.data
+4, biglen
-4);
681 PUT_32BIT(pktout
.data
+biglen
, crc
);
682 PUT_32BIT(pktout
.data
, len
);
685 debug(("Sending packet len=%d\r\n", biglen
+4));
686 for (i
= 0; i
< biglen
+4; i
++)
687 debug((" %02x", (unsigned char)pktout
.data
[i
]));
691 cipher
->encrypt(pktout
.data
+4, biglen
);
693 sk_write(s
, pktout
.data
, biglen
+4);
697 * Construct a packet with the specified contents and
698 * send it to the server.
700 static void send_packet(int pkttype
, ...)
703 unsigned char *p
, *argp
, argchar
;
704 unsigned long argint
;
705 int pktlen
, argtype
, arglen
;
709 va_start(args
, pkttype
);
710 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
713 (void) va_arg(args
, int);
717 (void) va_arg(args
, char);
721 (void) va_arg(args
, unsigned char *);
722 arglen
= va_arg(args
, int);
726 argp
= va_arg(args
, unsigned char *);
727 arglen
= strlen(argp
);
728 pktlen
+= 4 + arglen
;
731 bn
= va_arg(args
, Bignum
);
732 pktlen
+= ssh1_bignum_length(bn
);
740 s_wrpkt_start(pkttype
, pktlen
);
743 va_start(args
, pkttype
);
744 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
747 argint
= va_arg(args
, int);
748 PUT_32BIT(p
, argint
);
752 argchar
= va_arg(args
, unsigned char);
757 argp
= va_arg(args
, unsigned char *);
758 arglen
= va_arg(args
, int);
759 memcpy(p
, argp
, arglen
);
763 argp
= va_arg(args
, unsigned char *);
764 arglen
= strlen(argp
);
765 PUT_32BIT(p
, arglen
);
766 memcpy(p
+ 4, argp
, arglen
);
770 bn
= va_arg(args
, Bignum
);
771 p
+= ssh1_write_bignum(p
, bn
);
780 static int ssh_versioncmp(char *a
, char *b
) {
782 unsigned long av
, bv
;
784 av
= strtoul(a
, &ae
, 10);
785 bv
= strtoul(b
, &be
, 10);
786 if (av
!= bv
) return (av
< bv ?
-1 : +1);
787 if (*ae
== '.') ae
++;
788 if (*be
== '.') be
++;
789 av
= strtoul(ae
, &ae
, 10);
790 bv
= strtoul(be
, &be
, 10);
791 if (av
!= bv
) return (av
< bv ?
-1 : +1);
797 * Utility routine for putting an SSH-protocol `string' into a SHA
801 static void sha_string(SHA_State
*s
, void *str
, int len
) {
802 unsigned char lenblk
[4];
803 PUT_32BIT(lenblk
, len
);
804 SHA_Bytes(s
, lenblk
, 4);
805 SHA_Bytes(s
, str
, len
);
809 * SSH2 packet construction functions.
811 static void ssh2_pkt_adddata(void *data
, int len
) {
812 pktout
.length
+= len
;
813 if (pktout
.maxlen
< pktout
.length
) {
814 pktout
.maxlen
= pktout
.length
+ 256;
815 pktout
.data
= (pktout
.data
== NULL ?
smalloc(pktout
.maxlen
+APIEXTRA
) :
816 srealloc(pktout
.data
, pktout
.maxlen
+APIEXTRA
));
818 fatalbox("Out of memory");
820 memcpy(pktout
.data
+pktout
.length
-len
, data
, len
);
822 static void ssh2_pkt_addbyte(unsigned char byte
) {
823 ssh2_pkt_adddata(&byte
, 1);
825 static void ssh2_pkt_init(int pkt_type
) {
827 ssh2_pkt_addbyte((unsigned char)pkt_type
);
829 static void ssh2_pkt_addbool(unsigned char value
) {
830 ssh2_pkt_adddata(&value
, 1);
832 static void ssh2_pkt_adduint32(unsigned long value
) {
835 ssh2_pkt_adddata(x
, 4);
837 static void ssh2_pkt_addstring_start(void) {
838 ssh2_pkt_adduint32(0);
839 pktout
.savedpos
= pktout
.length
;
841 static void ssh2_pkt_addstring_str(char *data
) {
842 ssh2_pkt_adddata(data
, strlen(data
));
843 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
844 pktout
.length
- pktout
.savedpos
);
846 static void ssh2_pkt_addstring_data(char *data
, int len
) {
847 ssh2_pkt_adddata(data
, len
);
848 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
849 pktout
.length
- pktout
.savedpos
);
851 static void ssh2_pkt_addstring(char *data
) {
852 ssh2_pkt_addstring_start();
853 ssh2_pkt_addstring_str(data
);
855 static char *ssh2_mpint_fmt(Bignum b
, int *len
) {
858 p
= smalloc(n
* 2 + 1);
860 fatalbox("out of memory");
862 for (i
= 0; i
< n
; i
++) {
863 p
[i
*2+1] = (b
[n
-i
] >> 8) & 0xFF;
864 p
[i
*2+2] = (b
[n
-i
] ) & 0xFF;
867 while (p
[i
] == 0 && (p
[i
+1] & 0x80) == 0)
869 memmove(p
, p
+i
, n
*2+1-i
);
873 static void ssh2_pkt_addmp(Bignum b
) {
876 p
= ssh2_mpint_fmt(b
, &len
);
877 ssh2_pkt_addstring_start();
878 ssh2_pkt_addstring_data(p
, len
);
881 static void ssh2_pkt_send(void) {
882 int cipherblk
, maclen
, padding
, i
;
883 static unsigned long outgoing_sequence
= 0;
886 * Compress packet payload.
889 debug(("Pre-compression payload:\r\n"));
890 for (i
= 5; i
< pktout
.length
; i
++)
891 debug((" %02x", (unsigned char)pktout
.data
[i
]));
895 unsigned char *newpayload
;
897 if (cscomp
&& cscomp
->compress(pktout
.data
+5, pktout
.length
-5,
898 &newpayload
, &newlen
)) {
900 ssh2_pkt_adddata(newpayload
, newlen
);
906 * Add padding. At least four bytes, and must also bring total
907 * length (minus MAC) up to a multiple of the block size.
909 cipherblk
= cipher ? cipher
->blksize
: 8; /* block size */
910 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
912 padding
+= (cipherblk
- (pktout
.length
+ padding
) % cipherblk
) % cipherblk
;
913 pktout
.data
[4] = padding
;
914 for (i
= 0; i
< padding
; i
++)
915 pktout
.data
[pktout
.length
+ i
] = random_byte();
916 PUT_32BIT(pktout
.data
, pktout
.length
+ padding
- 4);
918 csmac
->generate(pktout
.data
, pktout
.length
+ padding
,
920 outgoing_sequence
++; /* whether or not we MACed */
923 debug(("Sending packet len=%d\r\n", pktout
.length
+padding
));
924 for (i
= 0; i
< pktout
.length
+padding
; i
++)
925 debug((" %02x", (unsigned char)pktout
.data
[i
]));
930 cscipher
->encrypt(pktout
.data
, pktout
.length
+ padding
);
931 maclen
= csmac ? csmac
->len
: 0;
933 sk_write(s
, pktout
.data
, pktout
.length
+ padding
+ maclen
);
937 void bndebug(char *string
, Bignum b
) {
940 p
= ssh2_mpint_fmt(b
, &len
);
941 debug(("%s", string
));
942 for (i
= 0; i
< len
; i
++)
943 debug((" %02x", p
[i
]));
949 static void sha_mpint(SHA_State
*s
, Bignum b
) {
952 p
= ssh2_mpint_fmt(b
, &len
);
953 sha_string(s
, p
, len
);
958 * SSH2 packet decode functions.
960 static unsigned long ssh2_pkt_getuint32(void) {
962 if (pktin
.length
- pktin
.savedpos
< 4)
963 return 0; /* arrgh, no way to decline (FIXME?) */
964 value
= GET_32BIT(pktin
.data
+pktin
.savedpos
);
968 static void ssh2_pkt_getstring(char **p
, int *length
) {
970 if (pktin
.length
- pktin
.savedpos
< 4)
972 *length
= GET_32BIT(pktin
.data
+pktin
.savedpos
);
974 if (pktin
.length
- pktin
.savedpos
< *length
)
976 *p
= pktin
.data
+pktin
.savedpos
;
977 pktin
.savedpos
+= *length
;
979 static Bignum
ssh2_pkt_getmp(void) {
984 ssh2_pkt_getstring(&p
, &length
);
988 bombout(("internal error: Can't handle negative mpints"));
991 b
= newbn((length
+1)/2);
992 for (i
= 0; i
< length
; i
++) {
995 b
[j
/2+1] |= ((unsigned char)p
[i
]) << 8;
997 b
[j
/2+1] |= ((unsigned char)p
[i
]);
999 while (b
[0] > 1 && b
[b
[0]] == 0) b
[0]--;
1003 static int do_ssh_init(unsigned char c
) {
1005 static char version
[10];
1006 static char vstring
[80];
1007 static char vlog
[sizeof(vstring
)+20];
1012 /* Search for the string "SSH-" in the input. */
1015 static const int transS
[] = { 1, 2, 2, 1 };
1016 static const int transH
[] = { 0, 0, 3, 0 };
1017 static const int transminus
[] = { 0, 0, 0, -1 };
1018 if (c
== 'S') i
= transS
[i
];
1019 else if (c
== 'H') i
= transH
[i
];
1020 else if (c
== '-') i
= transminus
[i
];
1024 crReturn(1); /* get another character */
1027 strcpy(vstring
, "SSH-");
1031 crReturn(1); /* get another char */
1032 if (vsp
< vstring
+sizeof(vstring
)-1)
1038 } else if (i
< sizeof(version
)-1)
1045 ssh_agentfwd_enabled
= FALSE
;
1046 rdpkt2_state
.incoming_sequence
= 0;
1049 sprintf(vlog
, "Server version: %s", vstring
);
1050 vlog
[strcspn(vlog
, "\r\n")] = '\0';
1054 * Server version "1.99" means we can choose whether we use v1
1055 * or v2 protocol. Choice is based on cfg.sshprot.
1057 if (ssh_versioncmp(version
, cfg
.sshprot
== 1 ?
"2.0" : "1.99") >= 0) {
1059 * This is a v2 server. Begin v2 protocol.
1061 char *verstring
= "SSH-2.0-PuTTY";
1062 SHA_Init(&exhashbase
);
1064 * Hash our version string and their version string.
1066 sha_string(&exhashbase
, verstring
, strlen(verstring
));
1067 sha_string(&exhashbase
, vstring
, strcspn(vstring
, "\r\n"));
1068 sprintf(vstring
, "%s\n", verstring
);
1069 sprintf(vlog
, "We claim version: %s", verstring
);
1071 logevent("Using SSH protocol version 2");
1072 sk_write(s
, vstring
, strlen(vstring
));
1073 ssh_protocol
= ssh2_protocol
;
1075 s_rdpkt
= ssh2_rdpkt
;
1078 * This is a v1 server. Begin v1 protocol.
1080 sprintf(vstring
, "SSH-%s-PuTTY\n",
1081 (ssh_versioncmp(version
, "1.5") <= 0 ? version
: "1.5"));
1082 sprintf(vlog
, "We claim version: %s", vstring
);
1083 vlog
[strcspn(vlog
, "\r\n")] = '\0';
1085 logevent("Using SSH protocol version 1");
1086 sk_write(s
, vstring
, strlen(vstring
));
1087 ssh_protocol
= ssh1_protocol
;
1089 s_rdpkt
= ssh1_rdpkt
;
1091 ssh_state
= SSH_STATE_BEFORE_SIZE
;
1096 static void ssh_gotdata(unsigned char *data
, int datalen
)
1101 * To begin with, feed the characters one by one to the
1102 * protocol initialisation / selection function do_ssh_init().
1103 * When that returns 0, we're done with the initial greeting
1104 * exchange and can move on to packet discipline.
1109 crReturnV
; /* more data please */
1110 ret
= do_ssh_init(*data
);
1117 * We emerge from that loop when the initial negotiation is
1118 * over and we have selected an s_rdpkt function. Now pass
1119 * everything to s_rdpkt, and then pass the resulting packets
1120 * to the proper protocol handler.
1125 while (datalen
> 0) {
1126 if ( s_rdpkt(&data
, &datalen
) == 0 ) {
1127 ssh_protocol(NULL
, 0, 1);
1128 if (ssh_state
== SSH_STATE_CLOSED
) {
1138 static int ssh_receive(Socket skt
, int urgent
, char *data
, int len
) {
1140 /* Connection has closed. */
1141 ssh_state
= SSH_STATE_CLOSED
;
1146 ssh_gotdata (data
, len
);
1147 if (ssh_state
== SSH_STATE_CLOSED
) {
1158 * Connect to specified host and port.
1159 * Returns an error message, or NULL on success.
1160 * Also places the canonical host name into `realhost'.
1162 static char *connect_to_host(char *host
, int port
, char **realhost
)
1171 savedhost
= smalloc(1+strlen(host
));
1173 fatalbox("Out of memory");
1174 strcpy(savedhost
, host
);
1177 port
= 22; /* default ssh port */
1190 addr
= sk_namelookup(host
, realhost
);
1191 if ( (err
= sk_addr_error(addr
)) )
1201 s
= sk_new(addr
, port
, 0, ssh_receive
);
1202 if ( (err
= sk_socket_error(s
)) )
1206 sk_write(s
, "connect ", 8);
1207 sk_write(s
, FWhost
, strlen(FWhost
));
1210 sprintf(buf
, " %d\n", FWport
);
1211 sk_write(s
, buf
, strlen(buf
));
1219 * Handle the key exchange and user authentication phases.
1221 static int do_ssh1_login(unsigned char *in
, int inlen
, int ispkt
)
1224 unsigned char *rsabuf
, *keystr1
, *keystr2
;
1225 unsigned char cookie
[8];
1226 struct RSAKey servkey
, hostkey
;
1227 struct MD5Context md5c
;
1228 static unsigned long supported_ciphers_mask
, supported_auths_mask
;
1229 static int tried_publickey
;
1230 static unsigned char session_id
[16];
1232 static char username
[100];
1236 if (!ispkt
) crWaitUntil(ispkt
);
1238 if (pktin
.type
!= SSH1_SMSG_PUBLIC_KEY
) {
1239 bombout(("Public key packet not received"));
1243 logevent("Received public keys");
1245 memcpy(cookie
, pktin
.body
, 8);
1247 i
= makekey(pktin
.body
+8, &servkey
, &keystr1
, 0);
1248 j
= makekey(pktin
.body
+8+i
, &hostkey
, &keystr2
, 0);
1251 * Log the host key fingerprint.
1255 logevent("Host key fingerprint is:");
1256 strcpy(logmsg
, " ");
1257 hostkey
.comment
= NULL
;
1258 rsa_fingerprint(logmsg
+strlen(logmsg
), sizeof(logmsg
)-strlen(logmsg
),
1263 supported_ciphers_mask
= GET_32BIT(pktin
.body
+12+i
+j
);
1264 supported_auths_mask
= GET_32BIT(pktin
.body
+16+i
+j
);
1267 MD5Update(&md5c
, keystr2
, hostkey
.bytes
);
1268 MD5Update(&md5c
, keystr1
, servkey
.bytes
);
1269 MD5Update(&md5c
, pktin
.body
, 8);
1270 MD5Final(session_id
, &md5c
);
1272 for (i
=0; i
<32; i
++)
1273 session_key
[i
] = random_byte();
1275 len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
1277 rsabuf
= smalloc(len
);
1279 fatalbox("Out of memory");
1282 * Verify the host key.
1286 * First format the key into a string.
1288 int len
= rsastr_len(&hostkey
);
1289 char fingerprint
[100];
1290 char *keystr
= smalloc(len
);
1292 fatalbox("Out of memory");
1293 rsastr_fmt(keystr
, &hostkey
);
1294 rsa_fingerprint(fingerprint
, sizeof(fingerprint
), &hostkey
);
1295 verify_ssh_host_key(savedhost
, savedport
, "rsa", keystr
, fingerprint
);
1299 for (i
=0; i
<32; i
++) {
1300 rsabuf
[i
] = session_key
[i
];
1302 rsabuf
[i
] ^= session_id
[i
];
1305 if (hostkey
.bytes
> servkey
.bytes
) {
1306 rsaencrypt(rsabuf
, 32, &servkey
);
1307 rsaencrypt(rsabuf
, servkey
.bytes
, &hostkey
);
1309 rsaencrypt(rsabuf
, 32, &hostkey
);
1310 rsaencrypt(rsabuf
, hostkey
.bytes
, &servkey
);
1313 logevent("Encrypted session key");
1315 cipher_type
= cfg
.cipher
== CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH
:
1316 cfg
.cipher
== CIPHER_DES ? SSH_CIPHER_DES
:
1318 if ((supported_ciphers_mask
& (1 << cipher_type
)) == 0) {
1319 c_write("Selected cipher not supported, falling back to 3DES\r\n", 53);
1320 cipher_type
= SSH_CIPHER_3DES
;
1322 switch (cipher_type
) {
1323 case SSH_CIPHER_3DES
: logevent("Using 3DES encryption"); break;
1324 case SSH_CIPHER_DES
: logevent("Using single-DES encryption"); break;
1325 case SSH_CIPHER_BLOWFISH
: logevent("Using Blowfish encryption"); break;
1328 send_packet(SSH1_CMSG_SESSION_KEY
,
1329 PKT_CHAR
, cipher_type
,
1330 PKT_DATA
, cookie
, 8,
1331 PKT_CHAR
, (len
*8) >> 8, PKT_CHAR
, (len
*8) & 0xFF,
1332 PKT_DATA
, rsabuf
, len
,
1336 logevent("Trying to enable encryption...");
1340 cipher
= cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish_ssh1
:
1341 cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
1343 cipher
->sesskey(session_key
);
1347 if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1348 bombout(("Encryption not successfully enabled"));
1352 logevent("Successfully started encryption");
1358 if ((flags
& FLAG_INTERACTIVE
) && !*cfg
.username
) {
1359 c_write("login as: ", 10);
1362 crWaitUntil(!ispkt
);
1363 while (inlen
--) switch (c
= *in
++) {
1370 c_write("\b \b", 3);
1376 c_write("\b \b", 3);
1385 if (((c
>= ' ' && c
<= '~') ||
1386 ((unsigned char)c
>= 160)) && pos
< 40) {
1387 username
[pos
++] = c
;
1394 username
[strcspn(username
, "\n\r")] = '\0';
1396 strncpy(username
, cfg
.username
, 99);
1397 username
[99] = '\0';
1400 send_packet(SSH1_CMSG_USER
, PKT_STR
, username
, PKT_END
);
1402 char userlog
[22+sizeof(username
)];
1403 sprintf(userlog
, "Sent username \"%s\"", username
);
1405 if (flags
& FLAG_INTERACTIVE
&&
1406 (!((flags
& FLAG_STDERR
) && (flags
& FLAG_VERBOSE
)))) {
1407 strcat(userlog
, "\r\n");
1408 c_write(userlog
, strlen(userlog
));
1415 tried_publickey
= 0;
1417 while (pktin
.type
== SSH1_SMSG_FAILURE
) {
1418 static char password
[100];
1419 static char prompt
[200];
1422 static int pwpkt_type
;
1424 * Show password prompt, having first obtained it via a TIS
1425 * or CryptoCard exchange if we're doing TIS or CryptoCard
1428 pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
1429 if (agent_exists()) {
1431 * Attempt RSA authentication using Pageant.
1433 static unsigned char request
[5], *response
, *p
;
1434 static int responselen
;
1435 static int i
, nkeys
;
1436 static int authed
= FALSE
;
1439 logevent("Pageant is running. Requesting keys.");
1441 /* Request the keys held by the agent. */
1442 PUT_32BIT(request
, 1);
1443 request
[4] = SSH_AGENTC_REQUEST_RSA_IDENTITIES
;
1444 agent_query(request
, 5, &r
, &responselen
);
1445 response
= (unsigned char *)r
;
1448 nkeys
= GET_32BIT(p
); p
+= 4;
1449 { char buf
[64]; sprintf(buf
, "Pageant has %d keys", nkeys
);
1451 for (i
= 0; i
< nkeys
; i
++) {
1452 static struct RSAKey key
;
1453 static Bignum challenge
;
1454 static char *commentp
;
1455 static int commentlen
;
1457 { char buf
[64]; sprintf(buf
, "Trying Pageant key #%d", i
);
1460 p
+= ssh1_read_bignum(p
, &key
.exponent
);
1461 p
+= ssh1_read_bignum(p
, &key
.modulus
);
1462 commentlen
= GET_32BIT(p
); p
+= 4;
1463 commentp
= p
; p
+= commentlen
;
1464 send_packet(SSH1_CMSG_AUTH_RSA
,
1465 PKT_BIGNUM
, key
.modulus
, PKT_END
);
1467 if (pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
1468 logevent("Key refused");
1471 logevent("Received RSA challenge");
1472 ssh1_read_bignum(pktin
.body
, &challenge
);
1474 char *agentreq
, *q
, *ret
;
1476 len
= 1 + 4; /* message type, bit count */
1477 len
+= ssh1_bignum_length(key
.exponent
);
1478 len
+= ssh1_bignum_length(key
.modulus
);
1479 len
+= ssh1_bignum_length(challenge
);
1480 len
+= 16; /* session id */
1481 len
+= 4; /* response format */
1482 agentreq
= smalloc(4 + len
);
1483 PUT_32BIT(agentreq
, len
);
1485 *q
++ = SSH_AGENTC_RSA_CHALLENGE
;
1486 PUT_32BIT(q
, ssh1_bignum_bitcount(key
.modulus
));
1488 q
+= ssh1_write_bignum(q
, key
.exponent
);
1489 q
+= ssh1_write_bignum(q
, key
.modulus
);
1490 q
+= ssh1_write_bignum(q
, challenge
);
1491 memcpy(q
, session_id
, 16); q
+= 16;
1492 PUT_32BIT(q
, 1); /* response format */
1493 agent_query(agentreq
, len
+4, &ret
, &retlen
);
1496 if (ret
[4] == SSH_AGENT_RSA_RESPONSE
) {
1497 logevent("Sending Pageant's response");
1498 send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE
,
1499 PKT_DATA
, ret
+5, 16, PKT_END
);
1502 if (pktin
.type
== SSH1_SMSG_SUCCESS
) {
1503 logevent("Pageant's response accepted");
1504 if (flags
& FLAG_VERBOSE
) {
1505 c_write("Authenticated using RSA key \"",
1507 c_write(commentp
, commentlen
);
1508 c_write("\" from agent\r\n", 14);
1512 logevent("Pageant's response not accepted");
1514 logevent("Pageant failed to answer challenge");
1518 logevent("No reply received from Pageant");
1521 freebn(key
.exponent
);
1522 freebn(key
.modulus
);
1531 if (*cfg
.keyfile
&& !tried_publickey
)
1532 pwpkt_type
= SSH1_CMSG_AUTH_RSA
;
1534 if (pktin
.type
== SSH1_SMSG_FAILURE
&&
1536 (supported_auths_mask
& (1<<SSH1_AUTH_TIS
))) {
1537 pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
1538 logevent("Requested TIS authentication");
1539 send_packet(SSH1_CMSG_AUTH_TIS
, PKT_END
);
1541 if (pktin
.type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
1542 logevent("TIS authentication declined");
1543 if (flags
& FLAG_INTERACTIVE
)
1544 c_write("TIS authentication refused.\r\n", 29);
1546 int challengelen
= ((pktin
.body
[0] << 24) |
1547 (pktin
.body
[1] << 16) |
1548 (pktin
.body
[2] << 8) |
1550 logevent("Received TIS challenge");
1551 if (challengelen
> sizeof(prompt
)-1)
1552 challengelen
= sizeof(prompt
)-1; /* prevent overrun */
1553 memcpy(prompt
, pktin
.body
+4, challengelen
);
1554 prompt
[challengelen
] = '\0';
1557 if (pktin
.type
== SSH1_SMSG_FAILURE
&&
1559 (supported_auths_mask
& (1<<SSH1_AUTH_CCARD
))) {
1560 pwpkt_type
= SSH1_CMSG_AUTH_CCARD_RESPONSE
;
1561 logevent("Requested CryptoCard authentication");
1562 send_packet(SSH1_CMSG_AUTH_CCARD
, PKT_END
);
1564 if (pktin
.type
!= SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
1565 logevent("CryptoCard authentication declined");
1566 c_write("CryptoCard authentication refused.\r\n", 29);
1568 int challengelen
= ((pktin
.body
[0] << 24) |
1569 (pktin
.body
[1] << 16) |
1570 (pktin
.body
[2] << 8) |
1572 logevent("Received CryptoCard challenge");
1573 if (challengelen
> sizeof(prompt
)-1)
1574 challengelen
= sizeof(prompt
)-1; /* prevent overrun */
1575 memcpy(prompt
, pktin
.body
+4, challengelen
);
1576 strncpy(prompt
+ challengelen
, "\r\nResponse : ",
1577 sizeof(prompt
)-challengelen
);
1578 prompt
[sizeof(prompt
)-1] = '\0';
1581 if (pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
1582 sprintf(prompt
, "%.90s@%.90s's password: ",
1583 username
, savedhost
);
1585 if (pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
1586 char *comment
= NULL
;
1587 if (flags
& FLAG_VERBOSE
)
1588 c_write("Trying public key authentication.\r\n", 35);
1589 if (!rsakey_encrypted(cfg
.keyfile
, &comment
)) {
1590 if (flags
& FLAG_VERBOSE
)
1591 c_write("No passphrase required.\r\n", 25);
1594 sprintf(prompt
, "Passphrase for key \"%.100s\": ", comment
);
1598 if (ssh_get_password
) {
1599 if (!ssh_get_password(prompt
, password
, sizeof(password
))) {
1601 * get_password failed to get a password (for
1602 * example because one was supplied on the command
1603 * line which has already failed to work).
1606 logevent("No more passwords to try");
1607 ssh_state
= SSH_STATE_CLOSED
;
1611 c_write(prompt
, strlen(prompt
));
1615 crWaitUntil(!ispkt
);
1616 while (inlen
--) switch (c
= *in
++) {
1633 if (((c
>= ' ' && c
<= '~') ||
1634 ((unsigned char)c
>= 160)) && pos
< sizeof(password
))
1635 password
[pos
++] = c
;
1643 if (pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
1645 * Try public key authentication with the specified
1648 static struct RSAKey pubkey
;
1649 static Bignum challenge
, response
;
1651 static unsigned char buffer
[32];
1653 tried_publickey
= 1;
1654 i
= loadrsakey(cfg
.keyfile
, &pubkey
, NULL
, password
);
1656 c_write("Couldn't load public key from ", 30);
1657 c_write(cfg
.keyfile
, strlen(cfg
.keyfile
));
1658 c_write(".\r\n", 3);
1659 continue; /* go and try password */
1662 c_write("Wrong passphrase.\r\n", 19);
1663 tried_publickey
= 0;
1664 continue; /* try again */
1668 * Send a public key attempt.
1670 send_packet(SSH1_CMSG_AUTH_RSA
,
1671 PKT_BIGNUM
, pubkey
.modulus
, PKT_END
);
1674 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1675 c_write("Server refused our public key.\r\n", 32);
1676 continue; /* go and try password */
1678 if (pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
1679 bombout(("Bizarre response to offer of public key"));
1682 ssh1_read_bignum(pktin
.body
, &challenge
);
1683 response
= rsadecrypt(challenge
, &pubkey
);
1684 freebn(pubkey
.private_exponent
); /* burn the evidence */
1686 for (i
= 0; i
< 32; i
+= 2) {
1687 buffer
[i
] = response
[16-i
/2] >> 8;
1688 buffer
[i
+1] = response
[16-i
/2] & 0xFF;
1692 MD5Update(&md5c
, buffer
, 32);
1693 MD5Update(&md5c
, session_id
, 16);
1694 MD5Final(buffer
, &md5c
);
1696 send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE
,
1697 PKT_DATA
, buffer
, 16, PKT_END
);
1700 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1701 if (flags
& FLAG_VERBOSE
)
1702 c_write("Failed to authenticate with our public key.\r\n",
1704 continue; /* go and try password */
1705 } else if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1706 bombout(("Bizarre response to RSA authentication response"));
1710 break; /* we're through! */
1712 send_packet(pwpkt_type
, PKT_STR
, password
, PKT_END
);
1714 logevent("Sent password");
1715 memset(password
, 0, strlen(password
));
1717 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1718 if (flags
& FLAG_VERBOSE
)
1719 c_write("Access denied\r\n", 15);
1720 logevent("Authentication refused");
1721 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1722 logevent("Received disconnect request");
1723 ssh_state
= SSH_STATE_CLOSED
;
1725 } else if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1726 bombout(("Strange packet received, type %d", pktin
.type
));
1731 logevent("Authentication successful");
1736 void sshfwd_close(struct ssh_channel
*c
) {
1739 send_packet(SSH1_MSG_CHANNEL_CLOSE
, PKT_INT
, c
->remoteid
, PKT_END
);
1740 logevent("X11 connection terminated");
1746 void sshfwd_write(struct ssh_channel
*c
, char *buf
, int len
) {
1748 send_packet(SSH1_MSG_CHANNEL_DATA
,
1749 PKT_INT
, c
->remoteid
,
1755 static void ssh1_protocol(unsigned char *in
, int inlen
, int ispkt
) {
1760 while (!do_ssh1_login(in
, inlen
, ispkt
)) {
1763 if (ssh_state
== SSH_STATE_CLOSED
)
1766 if (cfg
.agentfwd
&& agent_exists()) {
1767 logevent("Requesting agent forwarding");
1768 send_packet(SSH1_CMSG_AGENT_REQUEST_FORWARDING
, PKT_END
);
1769 do { crReturnV
; } while (!ispkt
);
1770 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1771 bombout(("Protocol confusion"));
1773 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1774 logevent("Agent forwarding refused");
1776 logevent("Agent forwarding enabled");
1777 ssh_agentfwd_enabled
= TRUE
;
1781 if (cfg
.x11_forward
) {
1782 char proto
[20], data
[64];
1783 logevent("Requesting X11 forwarding");
1784 x11_invent_auth(proto
, sizeof(proto
), data
, sizeof(data
));
1785 send_packet(SSH1_CMSG_X11_REQUEST_FORWARDING
,
1786 PKT_STR
, proto
, PKT_STR
, data
,
1789 do { crReturnV
; } while (!ispkt
);
1790 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1791 bombout(("Protocol confusion"));
1793 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1794 logevent("X11 forwarding refused");
1796 logevent("X11 forwarding enabled");
1797 ssh_X11_fwd_enabled
= TRUE
;
1802 send_packet(SSH1_CMSG_REQUEST_PTY
,
1803 PKT_STR
, cfg
.termtype
,
1804 PKT_INT
, rows
, PKT_INT
, cols
,
1805 PKT_INT
, 0, PKT_INT
, 0,
1808 ssh_state
= SSH_STATE_INTERMED
;
1809 do { crReturnV
; } while (!ispkt
);
1810 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1811 bombout(("Protocol confusion"));
1813 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1814 c_write("Server refused to allocate pty\r\n", 32);
1816 logevent("Allocated pty");
1819 if (cfg
.compression
) {
1820 send_packet(SSH1_CMSG_REQUEST_COMPRESSION
, PKT_INT
, 6, PKT_END
);
1821 do { crReturnV
; } while (!ispkt
);
1822 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1823 bombout(("Protocol confusion"));
1825 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1826 c_write("Server refused to compress\r\n", 32);
1828 logevent("Started compression");
1829 ssh1_compressing
= TRUE
;
1830 zlib_compress_init();
1831 zlib_decompress_init();
1834 if (*cfg
.remote_cmd
)
1835 send_packet(SSH1_CMSG_EXEC_CMD
, PKT_STR
, cfg
.remote_cmd
, PKT_END
);
1837 send_packet(SSH1_CMSG_EXEC_SHELL
, PKT_END
);
1838 logevent("Started session");
1840 ssh_state
= SSH_STATE_SESSION
;
1844 ssh_special(TS_EOF
);
1847 ssh_channels
= newtree234(ssh_channelcmp
);
1852 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
1853 pktin
.type
== SSH1_SMSG_STDERR_DATA
) {
1854 long len
= GET_32BIT(pktin
.body
);
1855 from_backend(pktin
.type
== SSH1_SMSG_STDERR_DATA
,
1857 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1858 ssh_state
= SSH_STATE_CLOSED
;
1859 logevent("Received disconnect request");
1861 } else if (pktin
.type
== SSH1_SMSG_X11_OPEN
) {
1862 /* Remote side is trying to open a channel to talk to our
1863 * X-Server. Give them back a local channel number. */
1865 struct ssh_channel
*c
, *d
;
1868 logevent("Received X11 connect request");
1869 /* Refuse if X11 forwarding is disabled. */
1870 if (!ssh_X11_fwd_enabled
) {
1871 send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE
,
1872 PKT_INT
, GET_32BIT(pktin
.body
),
1874 logevent("Rejected X11 connect request");
1878 c
= smalloc(sizeof(struct ssh_channel
));
1880 if ( x11_init(&c
->u
.x11
.s
, cfg
.x11_display
, c
, &rh
) != NULL
) {
1881 logevent("opening X11 forward connection failed");
1883 send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE
,
1884 PKT_INT
, GET_32BIT(pktin
.body
),
1887 logevent("opening X11 forward connection succeeded");
1888 for (i
=1, d
= first234(ssh_channels
, &e
); d
; d
= next234(&e
)) {
1890 break; /* found a free number */
1893 c
->remoteid
= GET_32BIT(pktin
.body
);
1896 c
->type
= SSH1_SMSG_X11_OPEN
;/* identify channel type */
1897 add234(ssh_channels
, c
);
1898 send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
1899 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
1901 logevent("Opened X11 forward channel");
1904 } else if (pktin
.type
== SSH1_SMSG_AGENT_OPEN
) {
1905 /* Remote side is trying to open a channel to talk to our
1906 * agent. Give them back a local channel number. */
1908 struct ssh_channel
*c
;
1911 /* Refuse if agent forwarding is disabled. */
1912 if (!ssh_agentfwd_enabled
) {
1913 send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE
,
1914 PKT_INT
, GET_32BIT(pktin
.body
),
1918 for (c
= first234(ssh_channels
, &e
); c
; c
= next234(&e
)) {
1920 break; /* found a free number */
1923 c
= smalloc(sizeof(struct ssh_channel
));
1924 c
->remoteid
= GET_32BIT(pktin
.body
);
1927 c
->type
= SSH1_SMSG_AGENT_OPEN
;/* identify channel type */
1928 c
->u
.a
.lensofar
= 0;
1929 add234(ssh_channels
, c
);
1930 send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
1931 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
1934 } else if (pktin
.type
== SSH1_MSG_CHANNEL_CLOSE
||
1935 pktin
.type
== SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
) {
1936 /* Remote side closes a channel. */
1937 unsigned i
= GET_32BIT(pktin
.body
);
1938 struct ssh_channel
*c
;
1939 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
1942 closetype
= (pktin
.type
== SSH1_MSG_CHANNEL_CLOSE ?
1 : 2);
1943 send_packet(pktin
.type
, PKT_INT
, c
->remoteid
, PKT_END
);
1944 if ((c
->closes
== 0) && (c
->type
== SSH1_SMSG_X11_OPEN
)) {
1945 logevent("X11 connection closed");
1946 assert(c
->u
.x11
.s
!= NULL
);
1947 x11_close(c
->u
.x11
.s
);
1950 c
->closes
|= closetype
;
1951 if (c
->closes
== 3) {
1952 del234(ssh_channels
, c
);
1956 } else if (pktin
.type
== SSH1_MSG_CHANNEL_DATA
) {
1957 /* Data sent down one of our channels. */
1958 int i
= GET_32BIT(pktin
.body
);
1959 int len
= GET_32BIT(pktin
.body
+4);
1960 unsigned char *p
= pktin
.body
+8;
1961 struct ssh_channel
*c
;
1962 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
1965 case SSH1_SMSG_X11_OPEN
:
1966 x11_send(c
->u
.x11
.s
, p
, len
);
1968 case SSH1_SMSG_AGENT_OPEN
:
1969 /* Data for an agent message. Buffer it. */
1971 if (c
->u
.a
.lensofar
< 4) {
1972 int l
= min(4 - c
->u
.a
.lensofar
, len
);
1973 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
, p
, l
);
1974 p
+= l
; len
-= l
; c
->u
.a
.lensofar
+= l
;
1976 if (c
->u
.a
.lensofar
== 4) {
1977 c
->u
.a
.totallen
= 4 + GET_32BIT(c
->u
.a
.msglen
);
1978 c
->u
.a
.message
= smalloc(c
->u
.a
.totallen
);
1979 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
1981 if (c
->u
.a
.lensofar
>= 4 && len
> 0) {
1982 int l
= min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
, len
);
1983 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
, p
, l
);
1984 p
+= l
; len
-= l
; c
->u
.a
.lensofar
+= l
;
1986 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
1987 void *reply
, *sentreply
;
1989 agent_query(c
->u
.a
.message
, c
->u
.a
.totallen
,
1994 /* Fake SSH_AGENT_FAILURE. */
1995 sentreply
= "\0\0\0\1\5";
1998 send_packet(SSH1_MSG_CHANNEL_DATA
,
1999 PKT_INT
, c
->remoteid
,
2001 PKT_DATA
, sentreply
, replylen
,
2005 sfree(c
->u
.a
.message
);
2006 c
->u
.a
.lensofar
= 0;
2012 } else if (pktin
.type
== SSH1_SMSG_SUCCESS
) {
2013 /* may be from EXEC_SHELL on some servers */
2014 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
2015 /* may be from EXEC_SHELL on some servers
2016 * if no pty is available or in other odd cases. Ignore */
2017 } else if (pktin
.type
== SSH1_SMSG_EXIT_STATUS
) {
2018 send_packet(SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
2020 bombout(("Strange packet received: type %d", pktin
.type
));
2025 int len
= min(inlen
, 512);
2026 send_packet(SSH1_CMSG_STDIN_DATA
,
2027 PKT_INT
, len
, PKT_DATA
, in
, len
, PKT_END
);
2038 * Utility routine for decoding comma-separated strings in KEXINIT.
2040 static int in_commasep_string(char *needle
, char *haystack
, int haylen
) {
2041 int needlen
= strlen(needle
);
2044 * Is it at the start of the string?
2046 if (haylen
>= needlen
&& /* haystack is long enough */
2047 !memcmp(needle
, haystack
, needlen
) && /* initial match */
2048 (haylen
== needlen
|| haystack
[needlen
] == ',')
2049 /* either , or EOS follows */
2053 * If not, search for the next comma and resume after that.
2054 * If no comma found, terminate.
2056 while (haylen
> 0 && *haystack
!= ',')
2057 haylen
--, haystack
++;
2060 haylen
--, haystack
++; /* skip over comma itself */
2065 * SSH2 key creation method.
2067 static void ssh2_mkkey(Bignum K
, char *H
, char chr
, char *keyspace
) {
2069 /* First 20 bytes. */
2072 SHA_Bytes(&s
, H
, 20);
2073 SHA_Bytes(&s
, &chr
, 1);
2074 SHA_Bytes(&s
, H
, 20);
2075 SHA_Final(&s
, keyspace
);
2076 /* Next 20 bytes. */
2079 SHA_Bytes(&s
, H
, 20);
2080 SHA_Bytes(&s
, keyspace
, 20);
2081 SHA_Final(&s
, keyspace
+20);
2085 * Handle the SSH2 transport layer.
2087 static int do_ssh2_transport(unsigned char *in
, int inlen
, int ispkt
)
2091 static Bignum e
, f
, K
;
2092 static const struct ssh_mac
**maclist
;
2094 static const struct ssh_cipher
*cscipher_tobe
= NULL
;
2095 static const struct ssh_cipher
*sccipher_tobe
= NULL
;
2096 static const struct ssh_mac
*csmac_tobe
= NULL
;
2097 static const struct ssh_mac
*scmac_tobe
= NULL
;
2098 static const struct ssh_compress
*cscomp_tobe
= NULL
;
2099 static const struct ssh_compress
*sccomp_tobe
= NULL
;
2100 static char *hostkeydata
, *sigdata
, *keystr
, *fingerprint
;
2101 static int hostkeylen
, siglen
;
2102 static void *hkey
; /* actual host key */
2103 static unsigned char exchange_hash
[20];
2104 static unsigned char keyspace
[40];
2105 static const struct ssh_cipher
*preferred_cipher
;
2106 static const struct ssh_compress
*preferred_comp
;
2107 static int first_kex
;
2114 * Set up the preferred cipher and compression.
2116 if (cfg
.cipher
== CIPHER_BLOWFISH
) {
2117 preferred_cipher
= &ssh_blowfish_ssh2
;
2118 } else if (cfg
.cipher
== CIPHER_DES
) {
2119 logevent("Single DES not supported in SSH2; using 3DES");
2120 preferred_cipher
= &ssh_3des_ssh2
;
2121 } else if (cfg
.cipher
== CIPHER_3DES
) {
2122 preferred_cipher
= &ssh_3des_ssh2
;
2124 /* Shouldn't happen, but we do want to initialise to _something_. */
2125 preferred_cipher
= &ssh_3des_ssh2
;
2127 if (cfg
.compression
)
2128 preferred_comp
= &ssh_zlib
;
2130 preferred_comp
= &ssh_comp_none
;
2133 * Be prepared to work around the buggy MAC problem.
2136 maclist
= buggymacs
, nmacs
= lenof(buggymacs
);
2138 maclist
= macs
, nmacs
= lenof(macs
);
2142 * Construct and send our key exchange packet.
2144 ssh2_pkt_init(SSH2_MSG_KEXINIT
);
2145 for (i
= 0; i
< 16; i
++)
2146 ssh2_pkt_addbyte((unsigned char)random_byte());
2147 /* List key exchange algorithms. */
2148 ssh2_pkt_addstring_start();
2149 for (i
= 0; i
< lenof(kex_algs
); i
++) {
2150 ssh2_pkt_addstring_str(kex_algs
[i
]->name
);
2151 if (i
< lenof(kex_algs
)-1)
2152 ssh2_pkt_addstring_str(",");
2154 /* List server host key algorithms. */
2155 ssh2_pkt_addstring_start();
2156 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
2157 ssh2_pkt_addstring_str(hostkey_algs
[i
]->name
);
2158 if (i
< lenof(hostkey_algs
)-1)
2159 ssh2_pkt_addstring_str(",");
2161 /* List client->server encryption algorithms. */
2162 ssh2_pkt_addstring_start();
2163 for (i
= 0; i
< lenof(ciphers
)+1; i
++) {
2164 const struct ssh_cipher
*c
= i
==0 ? preferred_cipher
: ciphers
[i
-1];
2165 ssh2_pkt_addstring_str(c
->name
);
2166 if (i
< lenof(ciphers
))
2167 ssh2_pkt_addstring_str(",");
2169 /* List server->client encryption algorithms. */
2170 ssh2_pkt_addstring_start();
2171 for (i
= 0; i
< lenof(ciphers
)+1; i
++) {
2172 const struct ssh_cipher
*c
= i
==0 ? preferred_cipher
: ciphers
[i
-1];
2173 ssh2_pkt_addstring_str(c
->name
);
2174 if (i
< lenof(ciphers
))
2175 ssh2_pkt_addstring_str(",");
2177 /* List client->server MAC algorithms. */
2178 ssh2_pkt_addstring_start();
2179 for (i
= 0; i
< nmacs
; i
++) {
2180 ssh2_pkt_addstring_str(maclist
[i
]->name
);
2182 ssh2_pkt_addstring_str(",");
2184 /* List server->client MAC algorithms. */
2185 ssh2_pkt_addstring_start();
2186 for (i
= 0; i
< nmacs
; i
++) {
2187 ssh2_pkt_addstring_str(maclist
[i
]->name
);
2189 ssh2_pkt_addstring_str(",");
2191 /* List client->server compression algorithms. */
2192 ssh2_pkt_addstring_start();
2193 for (i
= 0; i
< lenof(compressions
)+1; i
++) {
2194 const struct ssh_compress
*c
= i
==0 ? preferred_comp
: compressions
[i
-1];
2195 ssh2_pkt_addstring_str(c
->name
);
2196 if (i
< lenof(compressions
))
2197 ssh2_pkt_addstring_str(",");
2199 /* List server->client compression algorithms. */
2200 ssh2_pkt_addstring_start();
2201 for (i
= 0; i
< lenof(compressions
)+1; i
++) {
2202 const struct ssh_compress
*c
= i
==0 ? preferred_comp
: compressions
[i
-1];
2203 ssh2_pkt_addstring_str(c
->name
);
2204 if (i
< lenof(compressions
))
2205 ssh2_pkt_addstring_str(",");
2207 /* List client->server languages. Empty list. */
2208 ssh2_pkt_addstring_start();
2209 /* List server->client languages. Empty list. */
2210 ssh2_pkt_addstring_start();
2211 /* First KEX packet does _not_ follow, because we're not that brave. */
2212 ssh2_pkt_addbool(FALSE
);
2214 ssh2_pkt_adduint32(0);
2216 exhash
= exhashbase
;
2217 sha_string(&exhash
, pktout
.data
+5, pktout
.length
-5);
2221 if (!ispkt
) crWaitUntil(ispkt
);
2222 sha_string(&exhash
, pktin
.data
+5, pktin
.length
-5);
2225 * Now examine the other side's KEXINIT to see what we're up
2228 if (pktin
.type
!= SSH2_MSG_KEXINIT
) {
2229 bombout(("expected key exchange packet from server"));
2232 kex
= NULL
; hostkey
= NULL
; cscipher_tobe
= NULL
; sccipher_tobe
= NULL
;
2233 csmac_tobe
= NULL
; scmac_tobe
= NULL
; cscomp_tobe
= NULL
; sccomp_tobe
= NULL
;
2234 pktin
.savedpos
+= 16; /* skip garbage cookie */
2235 ssh2_pkt_getstring(&str
, &len
); /* key exchange algorithms */
2236 for (i
= 0; i
< lenof(kex_algs
); i
++) {
2237 if (in_commasep_string(kex_algs
[i
]->name
, str
, len
)) {
2242 ssh2_pkt_getstring(&str
, &len
); /* host key algorithms */
2243 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
2244 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
2245 hostkey
= hostkey_algs
[i
];
2249 ssh2_pkt_getstring(&str
, &len
); /* client->server cipher */
2250 for (i
= 0; i
< lenof(ciphers
)+1; i
++) {
2251 const struct ssh_cipher
*c
= i
==0 ? preferred_cipher
: ciphers
[i
-1];
2252 if (in_commasep_string(c
->name
, str
, len
)) {
2257 ssh2_pkt_getstring(&str
, &len
); /* server->client cipher */
2258 for (i
= 0; i
< lenof(ciphers
)+1; i
++) {
2259 const struct ssh_cipher
*c
= i
==0 ? preferred_cipher
: ciphers
[i
-1];
2260 if (in_commasep_string(c
->name
, str
, len
)) {
2265 ssh2_pkt_getstring(&str
, &len
); /* client->server mac */
2266 for (i
= 0; i
< nmacs
; i
++) {
2267 if (in_commasep_string(maclist
[i
]->name
, str
, len
)) {
2268 csmac_tobe
= maclist
[i
];
2272 ssh2_pkt_getstring(&str
, &len
); /* server->client mac */
2273 for (i
= 0; i
< nmacs
; i
++) {
2274 if (in_commasep_string(maclist
[i
]->name
, str
, len
)) {
2275 scmac_tobe
= maclist
[i
];
2279 ssh2_pkt_getstring(&str
, &len
); /* client->server compression */
2280 for (i
= 0; i
< lenof(compressions
)+1; i
++) {
2281 const struct ssh_compress
*c
= i
==0 ? preferred_comp
: compressions
[i
-1];
2282 if (in_commasep_string(c
->name
, str
, len
)) {
2287 ssh2_pkt_getstring(&str
, &len
); /* server->client compression */
2288 for (i
= 0; i
< lenof(compressions
)+1; i
++) {
2289 const struct ssh_compress
*c
= i
==0 ? preferred_comp
: compressions
[i
-1];
2290 if (in_commasep_string(c
->name
, str
, len
)) {
2297 * Currently we only support Diffie-Hellman and DSS, so let's
2298 * bomb out if those aren't selected.
2300 if (kex
!= &ssh_diffiehellman
|| hostkey
!= &ssh_dss
) {
2301 bombout(("internal fault: chaos in SSH 2 transport layer"));
2306 * Now we begin the fun. Generate and send e for Diffie-Hellman.
2309 ssh2_pkt_init(SSH2_MSG_KEXDH_INIT
);
2314 if (pktin
.type
!= SSH2_MSG_KEXDH_REPLY
) {
2315 bombout(("expected key exchange packet from server"));
2318 ssh2_pkt_getstring(&hostkeydata
, &hostkeylen
);
2319 f
= ssh2_pkt_getmp();
2320 ssh2_pkt_getstring(&sigdata
, &siglen
);
2324 sha_string(&exhash
, hostkeydata
, hostkeylen
);
2325 sha_mpint(&exhash
, e
);
2326 sha_mpint(&exhash
, f
);
2327 sha_mpint(&exhash
, K
);
2328 SHA_Final(&exhash
, exchange_hash
);
2331 debug(("Exchange hash is:\r\n"));
2332 for (i
= 0; i
< 20; i
++)
2333 debug((" %02x", exchange_hash
[i
]));
2337 hkey
= hostkey
->newkey(hostkeydata
, hostkeylen
);
2338 if (!hostkey
->verifysig(hkey
, sigdata
, siglen
, exchange_hash
, 20)) {
2339 bombout(("Server failed host key check"));
2344 * Expect SSH2_MSG_NEWKEYS from server.
2347 if (pktin
.type
!= SSH2_MSG_NEWKEYS
) {
2348 bombout(("expected new-keys packet from server"));
2353 * Authenticate remote host: verify host key. (We've already
2354 * checked the signature of the exchange hash.)
2356 keystr
= hostkey
->fmtkey(hkey
);
2357 fingerprint
= hostkey
->fingerprint(hkey
);
2358 verify_ssh_host_key(savedhost
, savedport
, hostkey
->keytype
,
2359 keystr
, fingerprint
);
2360 logevent("Host key fingerprint is:");
2361 logevent(fingerprint
);
2364 hostkey
->freekey(hkey
);
2367 * Send SSH2_MSG_NEWKEYS.
2369 ssh2_pkt_init(SSH2_MSG_NEWKEYS
);
2373 * Create and initialise session keys.
2375 cscipher
= cscipher_tobe
;
2376 sccipher
= sccipher_tobe
;
2379 cscomp
= cscomp_tobe
;
2380 sccomp
= sccomp_tobe
;
2381 cscomp
->compress_init();
2382 sccomp
->decompress_init();
2384 * Set IVs after keys.
2386 ssh2_mkkey(K
, exchange_hash
, 'C', keyspace
); cscipher
->setcskey(keyspace
);
2387 ssh2_mkkey(K
, exchange_hash
, 'D', keyspace
); sccipher
->setsckey(keyspace
);
2388 ssh2_mkkey(K
, exchange_hash
, 'A', keyspace
); cscipher
->setcsiv(keyspace
);
2389 ssh2_mkkey(K
, exchange_hash
, 'B', keyspace
); sccipher
->setsciv(keyspace
);
2390 ssh2_mkkey(K
, exchange_hash
, 'E', keyspace
); csmac
->setcskey(keyspace
);
2391 ssh2_mkkey(K
, exchange_hash
, 'F', keyspace
); scmac
->setsckey(keyspace
);
2394 * If this is the first key exchange phase, we must pass the
2395 * SSH2_MSG_NEWKEYS packet to the next layer, not because it
2396 * wants to see it but because it will need time to initialise
2397 * itself before it sees an actual packet. In subsequent key
2398 * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because
2399 * it would only confuse the layer above.
2407 * Now we're encrypting. Begin returning 1 to the protocol main
2408 * function so that other things can run on top of the
2409 * transport. If we ever see a KEXINIT, we must go back to the
2414 } while (!(ispkt
&& pktin
.type
== SSH2_MSG_KEXINIT
));
2415 goto begin_key_exchange
;
2421 * Handle the SSH2 userauth and connection layers.
2423 static void do_ssh2_authconn(unsigned char *in
, int inlen
, int ispkt
)
2425 static unsigned long remote_winsize
;
2426 static unsigned long remote_maxpkt
;
2431 * Request userauth protocol, and await a response to it.
2433 ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST
);
2434 ssh2_pkt_addstring("ssh-userauth");
2436 crWaitUntilV(ispkt
);
2437 if (pktin
.type
!= SSH2_MSG_SERVICE_ACCEPT
) {
2438 bombout(("Server refused user authentication protocol"));
2443 * FIXME: currently we support only password authentication.
2444 * (This places us technically in violation of the SSH2 spec.
2445 * We must fix this.)
2449 * Get a username and a password.
2451 static char username
[100];
2452 static char password
[100];
2456 if ((flags
& FLAG_INTERACTIVE
) && !*cfg
.username
) {
2457 c_write("login as: ", 10);
2460 crWaitUntilV(!ispkt
);
2461 while (inlen
--) switch (c
= *in
++) {
2468 c_write("\b \b", 3);
2474 c_write("\b \b", 3);
2483 if (((c
>= ' ' && c
<= '~') ||
2484 ((unsigned char)c
>= 160)) && pos
< 40) {
2485 username
[pos
++] = c
;
2492 username
[strcspn(username
, "\n\r")] = '\0';
2495 strncpy(username
, cfg
.username
, 99);
2496 username
[99] = '\0';
2497 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
2498 sprintf(stuff
, "Using username \"%s\".\r\n", username
);
2499 c_write(stuff
, strlen(stuff
));
2503 if (ssh_get_password
) {
2505 sprintf(prompt
, "%.90s@%.90s's password: ", username
, savedhost
);
2506 if (!ssh_get_password(prompt
, password
, sizeof(password
))) {
2508 * get_password failed to get a password (for
2509 * example because one was supplied on the command
2510 * line which has already failed to work).
2513 logevent("No more passwords to try");
2514 ssh_state
= SSH_STATE_CLOSED
;
2518 c_write("password: ", 10);
2523 crWaitUntilV(!ispkt
);
2524 while (inlen
--) switch (c
= *in
++) {
2541 if (((c
>= ' ' && c
<= '~') ||
2542 ((unsigned char)c
>= 160)) && pos
< 40)
2543 password
[pos
++] = c
;
2550 ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
2551 ssh2_pkt_addstring(username
);
2552 ssh2_pkt_addstring("ssh-connection"); /* service requested */
2553 ssh2_pkt_addstring("password");
2554 ssh2_pkt_addbool(FALSE
);
2555 ssh2_pkt_addstring(password
);
2558 crWaitUntilV(ispkt
);
2559 if (pktin
.type
!= SSH2_MSG_USERAUTH_SUCCESS
) {
2560 c_write("Access denied\r\n", 15);
2561 logevent("Authentication refused");
2567 * Now we're authenticated for the connection protocol. The
2568 * connection protocol will automatically have started at this
2569 * point; there's no need to send SERVICE_REQUEST.
2573 * So now create a channel with a session in it.
2575 mainchan
= smalloc(sizeof(struct ssh_channel
));
2576 mainchan
->localid
= 100; /* as good as any */
2577 ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
2578 ssh2_pkt_addstring("session");
2579 ssh2_pkt_adduint32(mainchan
->localid
);
2580 ssh2_pkt_adduint32(0x8000UL
); /* our window size */
2581 ssh2_pkt_adduint32(0x4000UL
); /* our max pkt size */
2583 crWaitUntilV(ispkt
);
2584 if (pktin
.type
!= SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
2585 bombout(("Server refused to open a session"));
2587 /* FIXME: error data comes back in FAILURE packet */
2589 if (ssh2_pkt_getuint32() != mainchan
->localid
) {
2590 bombout(("Server's channel confirmation cited wrong channel"));
2593 mainchan
->remoteid
= ssh2_pkt_getuint32();
2594 mainchan
->u
.v2
.remwindow
= ssh2_pkt_getuint32();
2595 mainchan
->u
.v2
.remmaxpkt
= ssh2_pkt_getuint32();
2596 mainchan
->u
.v2
.outbuffer
= NULL
;
2597 mainchan
->u
.v2
.outbuflen
= mainchan
->u
.v2
.outbufsize
= 0;
2598 logevent("Opened channel for session");
2601 * Now allocate a pty for the session.
2604 ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
2605 ssh2_pkt_adduint32(mainchan
->remoteid
); /* recipient channel */
2606 ssh2_pkt_addstring("pty-req");
2607 ssh2_pkt_addbool(1); /* want reply */
2608 ssh2_pkt_addstring(cfg
.termtype
);
2609 ssh2_pkt_adduint32(cols
);
2610 ssh2_pkt_adduint32(rows
);
2611 ssh2_pkt_adduint32(0); /* pixel width */
2612 ssh2_pkt_adduint32(0); /* pixel height */
2613 ssh2_pkt_addstring_start();
2614 ssh2_pkt_addstring_data("\0", 1);/* TTY_OP_END, no special options */
2616 ssh_state
= SSH_STATE_INTERMED
;
2619 crWaitUntilV(ispkt
);
2620 if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2621 /* FIXME: be able to handle other channels here */
2622 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2623 continue; /* wrong channel */
2624 mainchan
->u
.v2
.remwindow
+= ssh2_pkt_getuint32();
2626 } while (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2628 if (pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
2629 if (pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
2630 bombout(("Server got confused by pty request"));
2633 c_write("Server refused to allocate pty\r\n", 32);
2635 logevent("Allocated pty");
2640 * Start a shell or a remote command.
2642 ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
2643 ssh2_pkt_adduint32(mainchan
->remoteid
); /* recipient channel */
2644 if (*cfg
.remote_cmd
) {
2645 ssh2_pkt_addstring("exec");
2646 ssh2_pkt_addbool(1); /* want reply */
2647 ssh2_pkt_addstring(cfg
.remote_cmd
);
2649 ssh2_pkt_addstring("shell");
2650 ssh2_pkt_addbool(1); /* want reply */
2654 crWaitUntilV(ispkt
);
2655 if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2656 /* FIXME: be able to handle other channels here */
2657 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2658 continue; /* wrong channel */
2659 mainchan
->u
.v2
.remwindow
+= ssh2_pkt_getuint32();
2661 } while (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2662 if (pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
2663 if (pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
2664 bombout(("Server got confused by shell/command request"));
2667 bombout(("Server refused to start a shell/command"));
2670 logevent("Started a shell/command");
2673 ssh_state
= SSH_STATE_SESSION
;
2677 ssh_special(TS_EOF
);
2685 static int try_send
;
2689 if (pktin
.type
== SSH2_MSG_CHANNEL_DATA
||
2690 pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
) {
2693 /* FIXME: be able to handle other channels here */
2694 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2695 continue; /* wrong channel */
2696 if (pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
&&
2697 ssh2_pkt_getuint32() != SSH2_EXTENDED_DATA_STDERR
)
2698 continue; /* extended but not stderr */
2699 ssh2_pkt_getstring(&data
, &length
);
2701 from_backend(pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
,
2704 * Enlarge the window again at the remote side,
2705 * just in case it ever runs down and they fail
2706 * to send us any more data.
2708 ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2709 ssh2_pkt_adduint32(mainchan
->remoteid
);
2710 ssh2_pkt_adduint32(length
);
2713 } else if (pktin
.type
== SSH2_MSG_DISCONNECT
) {
2714 ssh_state
= SSH_STATE_CLOSED
;
2715 logevent("Received disconnect message");
2717 } else if (pktin
.type
== SSH2_MSG_CHANNEL_REQUEST
) {
2718 continue; /* exit status et al; ignore (FIXME?) */
2719 } else if (pktin
.type
== SSH2_MSG_CHANNEL_EOF
) {
2720 continue; /* remote sends EOF; ignore */
2721 } else if (pktin
.type
== SSH2_MSG_CHANNEL_CLOSE
) {
2722 /* FIXME: be able to handle other channels here */
2723 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2724 continue; /* wrong channel */
2725 ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
2726 ssh2_pkt_adduint32(mainchan
->remoteid
);
2728 /* FIXME: mark the channel as closed */
2729 if (1 /* FIXME: "all channels are closed" */) {
2730 logevent("All channels closed. Disconnecting");
2731 ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
2732 ssh2_pkt_adduint32(SSH2_DISCONNECT_BY_APPLICATION
);
2733 ssh2_pkt_addstring("All open channels closed");
2734 ssh2_pkt_addstring("en"); /* language tag */
2736 ssh_state
= SSH_STATE_CLOSED
;
2739 continue; /* remote sends close; ignore (FIXME) */
2740 } else if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2741 /* FIXME: be able to handle other channels here */
2742 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2743 continue; /* wrong channel */
2744 mainchan
->u
.v2
.remwindow
+= ssh2_pkt_getuint32();
2747 bombout(("Strange packet received: type %d", pktin
.type
));
2752 * We have spare data. Add it to the channel buffer.
2754 if (mainchan
->u
.v2
.outbufsize
<
2755 mainchan
->u
.v2
.outbuflen
+ inlen
) {
2756 mainchan
->u
.v2
.outbufsize
=
2757 mainchan
->u
.v2
.outbuflen
+ inlen
+ 1024;
2758 mainchan
->u
.v2
.outbuffer
= srealloc(mainchan
->u
.v2
.outbuffer
,
2759 mainchan
->u
.v2
.outbufsize
);
2761 memcpy(mainchan
->u
.v2
.outbuffer
+ mainchan
->u
.v2
.outbuflen
,
2763 mainchan
->u
.v2
.outbuflen
+= inlen
;
2768 * Try to send data on the channel if we can. (FIXME:
2769 * on _all_ channels.)
2771 while (mainchan
->u
.v2
.remwindow
> 0 &&
2772 mainchan
->u
.v2
.outbuflen
> 0) {
2773 unsigned len
= mainchan
->u
.v2
.remwindow
;
2774 if (len
> mainchan
->u
.v2
.outbuflen
)
2775 len
= mainchan
->u
.v2
.outbuflen
;
2776 if (len
> mainchan
->u
.v2
.remmaxpkt
)
2777 len
= mainchan
->u
.v2
.remmaxpkt
;
2778 ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA
);
2779 ssh2_pkt_adduint32(mainchan
->remoteid
);
2780 ssh2_pkt_addstring_start();
2781 ssh2_pkt_addstring_data(mainchan
->u
.v2
.outbuffer
, len
);
2783 mainchan
->u
.v2
.outbuflen
-= len
;
2784 memmove(mainchan
->u
.v2
.outbuffer
, mainchan
->u
.v2
.outbuffer
+len
,
2785 mainchan
->u
.v2
.outbuflen
);
2786 mainchan
->u
.v2
.remwindow
-= len
;
2795 * Handle the top-level SSH2 protocol.
2797 static void ssh2_protocol(unsigned char *in
, int inlen
, int ispkt
)
2799 if (do_ssh2_transport(in
, inlen
, ispkt
) == 0)
2801 do_ssh2_authconn(in
, inlen
, ispkt
);
2805 * Called to set up the connection.
2807 * Returns an error message, or NULL on success.
2809 static char *ssh_init (char *host
, int port
, char **realhost
) {
2813 if(crypto_startup() == 0)
2814 return "Microsoft high encryption pack not installed!";
2819 p
= connect_to_host(host
, port
, realhost
);
2827 * Called to send data down the Telnet connection.
2829 static void ssh_send (char *buf
, int len
) {
2830 if (s
== NULL
|| ssh_protocol
== NULL
)
2833 ssh_protocol(buf
, len
, 0);
2837 * Called to set the size of the window from SSH's POV.
2839 static void ssh_size(void) {
2840 switch (ssh_state
) {
2841 case SSH_STATE_BEFORE_SIZE
:
2842 case SSH_STATE_PREPACKET
:
2843 case SSH_STATE_CLOSED
:
2844 break; /* do nothing */
2845 case SSH_STATE_INTERMED
:
2846 size_needed
= TRUE
; /* buffer for later */
2848 case SSH_STATE_SESSION
:
2850 if (ssh_version
== 1) {
2851 send_packet(SSH1_CMSG_WINDOW_SIZE
,
2852 PKT_INT
, rows
, PKT_INT
, cols
,
2853 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
2855 ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
2856 ssh2_pkt_adduint32(mainchan
->remoteid
);
2857 ssh2_pkt_addstring("window-change");
2858 ssh2_pkt_addbool(0);
2859 ssh2_pkt_adduint32(cols
);
2860 ssh2_pkt_adduint32(rows
);
2861 ssh2_pkt_adduint32(0);
2862 ssh2_pkt_adduint32(0);
2871 * Send Telnet special codes. TS_EOF is useful for `plink', so you
2872 * can send an EOF and collect resulting output (e.g. `plink
2875 static void ssh_special (Telnet_Special code
) {
2876 if (code
== TS_EOF
) {
2877 if (ssh_state
!= SSH_STATE_SESSION
) {
2879 * Buffer the EOF in case we are pre-SESSION, so we can
2880 * send it as soon as we reach SESSION.
2886 if (ssh_version
== 1) {
2887 send_packet(SSH1_CMSG_EOF
, PKT_END
);
2889 ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF
);
2890 ssh2_pkt_adduint32(mainchan
->remoteid
);
2893 logevent("Sent EOF message");
2894 } else if (code
== TS_PING
) {
2895 if (ssh_state
== SSH_STATE_CLOSED
|| ssh_state
== SSH_STATE_PREPACKET
)
2897 if (ssh_version
== 1) {
2898 send_packet(SSH1_MSG_IGNORE
, PKT_STR
, "", PKT_END
);
2900 ssh2_pkt_init(SSH2_MSG_IGNORE
);
2901 ssh2_pkt_addstring_start();
2909 static Socket
ssh_socket(void) { return s
; }
2911 static int ssh_sendok(void) { return ssh_send_ok
; }
2913 Backend ssh_backend
= {