24 #define logevent(s) { logevent(s); \
25 if ((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)) \
26 fprintf(stderr, "%s\n", s); }
28 #define bombout(msg) ( ssh_state == SSH_STATE_CLOSED, closesocket(s), \
29 s = INVALID_SOCKET, connection_fatal msg )
31 #define SSH1_MSG_DISCONNECT 1 /* 0x1 */
32 #define SSH1_SMSG_PUBLIC_KEY 2 /* 0x2 */
33 #define SSH1_CMSG_SESSION_KEY 3 /* 0x3 */
34 #define SSH1_CMSG_USER 4 /* 0x4 */
35 #define SSH1_CMSG_AUTH_RSA 6 /* 0x6 */
36 #define SSH1_SMSG_AUTH_RSA_CHALLENGE 7 /* 0x7 */
37 #define SSH1_CMSG_AUTH_RSA_RESPONSE 8 /* 0x8 */
38 #define SSH1_CMSG_AUTH_PASSWORD 9 /* 0x9 */
39 #define SSH1_CMSG_REQUEST_PTY 10 /* 0xa */
40 #define SSH1_CMSG_WINDOW_SIZE 11 /* 0xb */
41 #define SSH1_CMSG_EXEC_SHELL 12 /* 0xc */
42 #define SSH1_CMSG_EXEC_CMD 13 /* 0xd */
43 #define SSH1_SMSG_SUCCESS 14 /* 0xe */
44 #define SSH1_SMSG_FAILURE 15 /* 0xf */
45 #define SSH1_CMSG_STDIN_DATA 16 /* 0x10 */
46 #define SSH1_SMSG_STDOUT_DATA 17 /* 0x11 */
47 #define SSH1_SMSG_STDERR_DATA 18 /* 0x12 */
48 #define SSH1_CMSG_EOF 19 /* 0x13 */
49 #define SSH1_SMSG_EXIT_STATUS 20 /* 0x14 */
50 #define SSH1_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* 0x15 */
51 #define SSH1_MSG_CHANNEL_OPEN_FAILURE 22 /* 0x16 */
52 #define SSH1_MSG_CHANNEL_DATA 23 /* 0x17 */
53 #define SSH1_MSG_CHANNEL_CLOSE 24 /* 0x18 */
54 #define SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* 0x19 */
55 #define SSH1_CMSG_AGENT_REQUEST_FORWARDING 30 /* 0x1e */
56 #define SSH1_SMSG_AGENT_OPEN 31 /* 0x1f */
57 #define SSH1_CMSG_EXIT_CONFIRMATION 33 /* 0x21 */
58 #define SSH1_MSG_IGNORE 32 /* 0x20 */
59 #define SSH1_MSG_DEBUG 36 /* 0x24 */
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_OPEN_ADMINISTRATIVELY_PROHIBITED 1 /* 0x1 */
111 #define SSH2_OPEN_CONNECT_FAILED 2 /* 0x2 */
112 #define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3 /* 0x3 */
113 #define SSH2_OPEN_RESOURCE_SHORTAGE 4 /* 0x4 */
115 #define SSH2_EXTENDED_DATA_STDERR 1 /* 0x1 */
117 #define GET_32BIT(cp) \
118 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
119 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
120 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
121 ((unsigned long)(unsigned char)(cp)[3]))
123 #define PUT_32BIT(cp, value) { \
124 (cp)[0] = (unsigned char)((value) >> 24); \
125 (cp)[1] = (unsigned char)((value) >> 16); \
126 (cp)[2] = (unsigned char)((value) >> 8); \
127 (cp)[3] = (unsigned char)(value); }
129 enum { PKT_END
, PKT_INT
, PKT_CHAR
, PKT_DATA
, PKT_STR
, PKT_BIGNUM
};
131 /* Coroutine mechanics for the sillier bits of the code */
132 #define crBegin1 static int crLine = 0;
133 #define crBegin2 switch(crLine) { case 0:;
134 #define crBegin crBegin1; crBegin2;
135 #define crFinish(z) } crLine = 0; return (z)
136 #define crFinishV } crLine = 0; return
137 #define crReturn(z) \
139 crLine=__LINE__; return (z); case __LINE__:;\
143 crLine=__LINE__; return; case __LINE__:;\
145 #define crStop(z) do{ crLine = 0; return (z); }while(0)
146 #define crStopV do{ crLine = 0; return; }while(0)
147 #define crWaitUntil(c) do { crReturn(0); } while (!(c))
148 #define crWaitUntilV(c) do { crReturnV; } while (!(c))
150 extern const struct ssh_cipher ssh_3des
;
151 extern const struct ssh_cipher ssh_3des_ssh2
;
152 extern const struct ssh_cipher ssh_des
;
153 extern const struct ssh_cipher ssh_blowfish_ssh1
;
154 extern const struct ssh_cipher ssh_blowfish_ssh2
;
157 * Ciphers for SSH2. We miss out single-DES because it isn't
158 * supported; also 3DES and Blowfish are both done differently from
159 * SSH1. (3DES uses outer chaining; Blowfish has the opposite
160 * endianness and different-sized keys.)
162 const static struct ssh_cipher
*ciphers
[] = { &ssh_blowfish_ssh2
, &ssh_3des_ssh2
};
164 extern const struct ssh_kex ssh_diffiehellman
;
165 const static struct ssh_kex
*kex_algs
[] = { &ssh_diffiehellman
};
167 extern const struct ssh_hostkey ssh_dss
;
168 const static struct ssh_hostkey
*hostkey_algs
[] = { &ssh_dss
};
170 extern const struct ssh_mac ssh_sha1
, ssh_sha1_buggy
;
172 static void nullmac_key(unsigned char *key
) { }
173 static void nullmac_generate(unsigned char *blk
, int len
, unsigned long seq
) { }
174 static int nullmac_verify(unsigned char *blk
, int len
, unsigned long seq
) { return 1; }
175 const static struct ssh_mac ssh_mac_none
= {
176 nullmac_key
, nullmac_key
, nullmac_generate
, nullmac_verify
, "none", 0
178 const static struct ssh_mac
*macs
[] = { &ssh_sha1
, &ssh_mac_none
};
179 const static struct ssh_mac
*buggymacs
[] = { &ssh_sha1_buggy
, &ssh_mac_none
};
181 const static struct ssh_compress ssh_comp_none
= {
184 const static struct ssh_compress
*compressions
[] = { &ssh_comp_none
};
187 * 2-3-4 tree storing channels.
190 unsigned remoteid
, localid
;
194 struct ssh_agent_channel
{
195 unsigned char *message
;
196 unsigned char msglen
[4];
197 int lensofar
, totallen
;
199 struct ssh2_data_channel
{
200 unsigned char *outbuffer
;
201 unsigned outbuflen
, outbufsize
;
202 unsigned remwindow
, remmaxpkt
;
216 static SHA_State exhash
;
218 static SOCKET s
= INVALID_SOCKET
;
220 static unsigned char session_key
[32];
221 static const struct ssh_cipher
*cipher
= NULL
;
222 static const struct ssh_cipher
*cscipher
= NULL
;
223 static const struct ssh_cipher
*sccipher
= NULL
;
224 static const struct ssh_mac
*csmac
= NULL
;
225 static const struct ssh_mac
*scmac
= NULL
;
226 static const struct ssh_compress
*cscomp
= NULL
;
227 static const struct ssh_compress
*sccomp
= NULL
;
228 static const struct ssh_kex
*kex
= NULL
;
229 static const struct ssh_hostkey
*hostkey
= NULL
;
230 int (*ssh_get_password
)(const char *prompt
, char *str
, int maxlen
) = NULL
;
232 static char *savedhost
;
233 static int savedport
;
234 static int ssh_send_ok
;
236 static tree234
*ssh_channels
; /* indexed by local id */
237 static struct ssh_channel
*mainchan
; /* primary session channel */
240 SSH_STATE_BEFORE_SIZE
,
244 } ssh_state
= SSH_STATE_BEFORE_SIZE
;
246 static int size_needed
= FALSE
;
248 static struct Packet pktin
= { 0, 0, NULL
, NULL
, 0 };
249 static struct Packet pktout
= { 0, 0, NULL
, NULL
, 0 };
251 static int ssh_version
;
252 static void (*ssh_protocol
)(unsigned char *in
, int inlen
, int ispkt
);
253 static void ssh1_protocol(unsigned char *in
, int inlen
, int ispkt
);
254 static void ssh2_protocol(unsigned char *in
, int inlen
, int ispkt
);
255 static void ssh_size(void);
257 static int (*s_rdpkt
)(unsigned char **data
, int *datalen
);
259 static struct rdpkt1_state_tag
{
260 long len
, pad
, biglen
, to_read
;
261 unsigned long realcrc
, gotcrc
;
267 static struct rdpkt2_state_tag
{
268 long len
, pad
, payload
, packetlen
, maclen
;
271 unsigned long incoming_sequence
;
274 static int ssh_channelcmp(void *av
, void *bv
) {
275 struct ssh_channel
*a
= (struct ssh_channel
*)av
;
276 struct ssh_channel
*b
= (struct ssh_channel
*)bv
;
277 if (a
->localid
< b
->localid
) return -1;
278 if (a
->localid
> b
->localid
) return +1;
281 static int ssh_channelfind(void *av
, void *bv
) {
282 unsigned *a
= (unsigned *)av
;
283 struct ssh_channel
*b
= (struct ssh_channel
*)bv
;
284 if (*a
< b
->localid
) return -1;
285 if (*a
> b
->localid
) return +1;
289 static void s_write (char *buf
, int len
) {
291 int i
= send (s
, buf
, len
, 0);
294 bombout(("Lost connection while sending"));
302 static int s_read (char *buf
, int len
) {
305 int i
= recv (s
, buf
, len
, 0);
308 len
-= i
, buf
+= i
, ret
+= i
;
315 static void c_write (char *buf
, int len
) {
316 if ((flags
& FLAG_STDERR
)) {
318 for (i
= 0; i
< len
; i
++)
320 fputc(buf
[i
], stderr
);
327 static void c_writedata (char *buf
, int len
) {
333 * Collect incoming data in the incoming packet buffer.
334 * Decipher and verify the packet when it is completely read.
335 * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets.
336 * Update the *data and *datalen variables.
337 * Return the additional nr of bytes needed, or 0 when
338 * a complete packet is available.
340 static int ssh1_rdpkt(unsigned char **data
, int *datalen
)
342 struct rdpkt1_state_tag
*st
= &rdpkt1_state
;
351 for (st
->i
= st
->len
= 0; st
->i
< 4; st
->i
++) {
352 while ((*datalen
) == 0)
354 st
->len
= (st
->len
<< 8) + **data
;
355 (*data
)++, (*datalen
)--;
359 if (st
->len
== 0x52656d6f) { /* "Remo"te server has closed ... */
360 st
->len
= 0x300; /* big enough to carry to end */
364 st
->pad
= 8 - (st
->len
% 8);
365 st
->biglen
= st
->len
+ st
->pad
;
366 pktin
.length
= st
->len
- 5;
368 if (pktin
.maxlen
< st
->biglen
) {
369 pktin
.maxlen
= st
->biglen
;
370 pktin
.data
= (pktin
.data
== NULL ?
malloc(st
->biglen
+APIEXTRA
) :
371 realloc(pktin
.data
, st
->biglen
+APIEXTRA
));
373 fatalbox("Out of memory");
376 st
->to_read
= st
->biglen
;
378 while (st
->to_read
> 0) {
379 st
->chunk
= st
->to_read
;
380 while ((*datalen
) == 0)
381 crReturn(st
->to_read
);
382 if (st
->chunk
> (*datalen
))
383 st
->chunk
= (*datalen
);
384 memcpy(st
->p
, *data
, st
->chunk
);
386 *datalen
-= st
->chunk
;
388 st
->to_read
-= st
->chunk
;
392 cipher
->decrypt(pktin
.data
, st
->biglen
);
394 pktin
.type
= pktin
.data
[st
->pad
];
395 pktin
.body
= pktin
.data
+ st
->pad
+ 1;
397 st
->realcrc
= crc32(pktin
.data
, st
->biglen
-4);
398 st
->gotcrc
= GET_32BIT(pktin
.data
+st
->biglen
-4);
399 if (st
->gotcrc
!= st
->realcrc
) {
400 bombout(("Incorrect CRC received on packet"));
404 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
405 pktin
.type
== SSH1_SMSG_STDERR_DATA
||
406 pktin
.type
== SSH1_MSG_DEBUG
||
407 pktin
.type
== SSH1_SMSG_AUTH_TIS_CHALLENGE
||
408 pktin
.type
== SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
409 long strlen
= GET_32BIT(pktin
.body
);
410 if (strlen
+ 4 != pktin
.length
) {
411 bombout(("Received data packet with bogus string length"));
416 if (pktin
.type
== SSH1_MSG_DEBUG
) {
417 /* log debug message */
419 int strlen
= GET_32BIT(pktin
.body
);
420 strcpy(buf
, "Remote: ");
421 if (strlen
> 70) strlen
= 70;
422 memcpy(buf
+8, pktin
.body
+4, strlen
);
423 buf
[8+strlen
] = '\0';
426 } else if (pktin
.type
== SSH1_MSG_IGNORE
) {
434 static int ssh2_rdpkt(unsigned char **data
, int *datalen
)
436 struct rdpkt2_state_tag
*st
= &rdpkt2_state
;
444 st
->cipherblk
= sccipher
->blksize
;
447 if (st
->cipherblk
< 8)
450 if (pktin
.maxlen
< st
->cipherblk
) {
451 pktin
.maxlen
= st
->cipherblk
;
452 pktin
.data
= (pktin
.data
== NULL ?
malloc(st
->cipherblk
+APIEXTRA
) :
453 realloc(pktin
.data
, st
->cipherblk
+APIEXTRA
));
455 fatalbox("Out of memory");
459 * Acquire and decrypt the first block of the packet. This will
460 * contain the length and padding details.
462 for (st
->i
= st
->len
= 0; st
->i
< st
->cipherblk
; st
->i
++) {
463 while ((*datalen
) == 0)
464 crReturn(st
->cipherblk
-st
->i
);
465 pktin
.data
[st
->i
] = *(*data
)++;
469 if (!memcmp(pktin
.data
, "Remo", 4)) {/* "Remo"te server has closed ... */
474 sccipher
->decrypt(pktin
.data
, st
->cipherblk
);
477 * Now get the length and padding figures.
479 st
->len
= GET_32BIT(pktin
.data
);
480 st
->pad
= pktin
.data
[4];
483 * This enables us to deduce the payload length.
485 st
->payload
= st
->len
- st
->pad
- 1;
487 pktin
.length
= st
->payload
+ 5;
490 * So now we can work out the total packet length.
492 st
->packetlen
= st
->len
+ 4;
493 st
->maclen
= scmac ? scmac
->len
: 0;
496 * Adjust memory allocation if packet is too big.
498 if (pktin
.maxlen
< st
->packetlen
+st
->maclen
) {
499 pktin
.maxlen
= st
->packetlen
+st
->maclen
;
500 pktin
.data
= (pktin
.data
== NULL ?
malloc(pktin
.maxlen
+APIEXTRA
) :
501 realloc(pktin
.data
, pktin
.maxlen
+APIEXTRA
));
503 fatalbox("Out of memory");
507 * Read and decrypt the remainder of the packet.
509 for (st
->i
= st
->cipherblk
; st
->i
< st
->packetlen
+ st
->maclen
; st
->i
++) {
510 while ((*datalen
) == 0)
511 crReturn(st
->packetlen
+ st
->maclen
- st
->i
);
512 pktin
.data
[st
->i
] = *(*data
)++;
515 /* Decrypt everything _except_ the MAC. */
517 sccipher
->decrypt(pktin
.data
+ st
->cipherblk
,
518 st
->packetlen
- st
->cipherblk
);
521 debug(("Got packet len=%d pad=%d\r\n", st
->len
, st
->pad
));
522 for (st
->i
= 0; st
->i
< st
->packetlen
; st
->i
++)
523 debug((" %02x", (unsigned char)pktin
.data
[st
->i
]));
530 if (scmac
&& !scmac
->verify(pktin
.data
, st
->len
+4, st
->incoming_sequence
)) {
531 bombout(("Incorrect MAC received on packet"));
534 st
->incoming_sequence
++; /* whether or not we MACed */
537 pktin
.type
= pktin
.data
[5];
539 if (pktin
.type
== SSH2_MSG_IGNORE
|| pktin
.type
== SSH2_MSG_DEBUG
)
540 goto next_packet
; /* FIXME: print DEBUG message */
545 static void ssh_gotdata(unsigned char *data
, int datalen
)
547 while (datalen
> 0) {
548 if ( s_rdpkt(&data
, &datalen
) == 0 ) {
549 ssh_protocol(NULL
, 0, 1);
550 if (ssh_state
== SSH_STATE_CLOSED
) {
558 static void s_wrpkt_start(int type
, int len
) {
561 len
+= 5; /* type and CRC */
565 pktout
.length
= len
-5;
566 if (pktout
.maxlen
< biglen
) {
567 pktout
.maxlen
= biglen
;
569 /* Allocate enough buffer space for extra block
570 * for MS CryptEncrypt() */
571 pktout
.data
= (pktout
.data
== NULL ?
malloc(biglen
+12) :
572 realloc(pktout
.data
, biglen
+12));
574 pktout
.data
= (pktout
.data
== NULL ?
malloc(biglen
+4) :
575 realloc(pktout
.data
, biglen
+4));
578 fatalbox("Out of memory");
582 pktout
.body
= pktout
.data
+4+pad
+1;
585 static void s_wrpkt(void) {
586 int pad
, len
, biglen
, i
;
589 len
= pktout
.length
+ 5; /* type and CRC */
593 pktout
.body
[-1] = pktout
.type
;
594 for (i
=0; i
<pad
; i
++)
595 pktout
.data
[i
+4] = random_byte();
596 crc
= crc32(pktout
.data
+4, biglen
-4);
597 PUT_32BIT(pktout
.data
+biglen
, crc
);
598 PUT_32BIT(pktout
.data
, len
);
601 cipher
->encrypt(pktout
.data
+4, biglen
);
603 s_write(pktout
.data
, biglen
+4);
607 * Construct a packet with the specified contents and
608 * send it to the server.
610 static void send_packet(int pkttype
, ...)
613 unsigned char *p
, *argp
, argchar
;
614 unsigned long argint
;
615 int pktlen
, argtype
, arglen
;
619 va_start(args
, pkttype
);
620 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
623 (void) va_arg(args
, int);
627 (void) va_arg(args
, char);
631 (void) va_arg(args
, unsigned char *);
632 arglen
= va_arg(args
, int);
636 argp
= va_arg(args
, unsigned char *);
637 arglen
= strlen(argp
);
638 pktlen
+= 4 + arglen
;
641 bn
= va_arg(args
, Bignum
);
642 pktlen
+= ssh1_bignum_length(bn
);
650 s_wrpkt_start(pkttype
, pktlen
);
653 va_start(args
, pkttype
);
654 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
657 argint
= va_arg(args
, int);
658 PUT_32BIT(p
, argint
);
662 argchar
= va_arg(args
, unsigned char);
667 argp
= va_arg(args
, unsigned char *);
668 arglen
= va_arg(args
, int);
669 memcpy(p
, argp
, arglen
);
673 argp
= va_arg(args
, unsigned char *);
674 arglen
= strlen(argp
);
675 PUT_32BIT(p
, arglen
);
676 memcpy(p
+ 4, argp
, arglen
);
680 bn
= va_arg(args
, Bignum
);
681 p
+= ssh1_write_bignum(p
, bn
);
692 * Connect to specified host and port.
693 * Returns an error message, or NULL on success.
694 * Also places the canonical host name into `realhost'.
696 static char *connect_to_host(char *host
, int port
, char **realhost
)
706 savedhost
= malloc(1+strlen(host
));
708 fatalbox("Out of memory");
709 strcpy(savedhost
, host
);
712 port
= 22; /* default ssh port */
725 if ( (a
= inet_addr(host
)) == (unsigned long) INADDR_NONE
) {
726 if ( (h
= gethostbyname(host
)) == NULL
)
727 switch (WSAGetLastError()) {
728 case WSAENETDOWN
: return "Network is down";
729 case WSAHOST_NOT_FOUND
: case WSANO_DATA
:
730 return "Host does not exist";
731 case WSATRY_AGAIN
: return "Host not found";
732 default: return "gethostbyname: unknown error";
734 memcpy (&a
, h
->h_addr
, sizeof(a
));
735 *realhost
= h
->h_name
;
746 s
= socket(AF_INET
, SOCK_STREAM
, 0);
747 if (s
== INVALID_SOCKET
)
748 switch (WSAGetLastError()) {
749 case WSAENETDOWN
: return "Network is down";
750 case WSAEAFNOSUPPORT
: return "TCP/IP support not present";
751 default: return "socket(): unknown error";
755 * Bind to local address.
757 addr
.sin_family
= AF_INET
;
758 addr
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
759 addr
.sin_port
= htons(0);
760 if (bind (s
, (struct sockaddr
*)&addr
, sizeof(addr
)) == SOCKET_ERROR
)
761 switch (WSAGetLastError()) {
762 case WSAENETDOWN
: return "Network is down";
763 default: return "bind(): unknown error";
767 * Connect to remote address.
769 addr
.sin_addr
.s_addr
= htonl(a
);
770 addr
.sin_port
= htons((short)port
);
771 if (connect (s
, (struct sockaddr
*)&addr
, sizeof(addr
)) == SOCKET_ERROR
)
772 switch (WSAGetLastError()) {
773 case WSAENETDOWN
: return "Network is down";
774 case WSAECONNREFUSED
: return "Connection refused";
775 case WSAENETUNREACH
: return "Network is unreachable";
776 case WSAEHOSTUNREACH
: return "No route to host";
777 default: return "connect(): unknown error";
781 send(s
, "connect ", 8, 0);
782 send(s
, FWhost
, strlen(FWhost
), 0);
785 sprintf(buf
, " %d\n", FWport
);
786 send (s
, buf
, strlen(buf
), 0);
793 static int ssh_versioncmp(char *a
, char *b
) {
795 unsigned long av
, bv
;
797 av
= strtoul(a
, &ae
, 10);
798 bv
= strtoul(b
, &be
, 10);
799 if (av
!= bv
) return (av
< bv ?
-1 : +1);
800 if (*ae
== '.') ae
++;
801 if (*be
== '.') be
++;
802 av
= strtoul(ae
, &ae
, 10);
803 bv
= strtoul(be
, &be
, 10);
804 if (av
!= bv
) return (av
< bv ?
-1 : +1);
810 * Utility routine for putting an SSH-protocol `string' into a SHA
814 static void sha_string(SHA_State
*s
, void *str
, int len
) {
815 unsigned char lenblk
[4];
816 PUT_32BIT(lenblk
, len
);
817 SHA_Bytes(s
, lenblk
, 4);
818 SHA_Bytes(s
, str
, len
);
822 * SSH2 packet construction functions.
824 static void ssh2_pkt_adddata(void *data
, int len
) {
825 pktout
.length
+= len
;
826 if (pktout
.maxlen
< pktout
.length
) {
827 pktout
.maxlen
= pktout
.length
+ 256;
828 pktout
.data
= (pktout
.data
== NULL ?
malloc(pktout
.maxlen
+APIEXTRA
) :
829 realloc(pktout
.data
, pktout
.maxlen
+APIEXTRA
));
831 fatalbox("Out of memory");
833 memcpy(pktout
.data
+pktout
.length
-len
, data
, len
);
835 static void ssh2_pkt_addbyte(unsigned char byte
) {
836 ssh2_pkt_adddata(&byte
, 1);
838 static void ssh2_pkt_init(int pkt_type
) {
840 ssh2_pkt_addbyte((unsigned char)pkt_type
);
842 static void ssh2_pkt_addbool(unsigned char value
) {
843 ssh2_pkt_adddata(&value
, 1);
845 static void ssh2_pkt_adduint32(unsigned long value
) {
848 ssh2_pkt_adddata(x
, 4);
850 static void ssh2_pkt_addstring_start(void) {
851 ssh2_pkt_adduint32(0);
852 pktout
.savedpos
= pktout
.length
;
854 static void ssh2_pkt_addstring_str(char *data
) {
855 ssh2_pkt_adddata(data
, strlen(data
));
856 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
857 pktout
.length
- pktout
.savedpos
);
859 static void ssh2_pkt_addstring_data(char *data
, int len
) {
860 ssh2_pkt_adddata(data
, len
);
861 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
862 pktout
.length
- pktout
.savedpos
);
864 static void ssh2_pkt_addstring(char *data
) {
865 ssh2_pkt_addstring_start();
866 ssh2_pkt_addstring_str(data
);
868 static char *ssh2_mpint_fmt(Bignum b
, int *len
) {
871 p
= malloc(n
* 2 + 1);
873 fatalbox("out of memory");
875 for (i
= 0; i
< n
; i
++) {
876 p
[i
*2+1] = (b
[n
-i
] >> 8) & 0xFF;
877 p
[i
*2+2] = (b
[n
-i
] ) & 0xFF;
880 while (p
[i
] == 0 && (p
[i
+1] & 0x80) == 0)
882 memmove(p
, p
+i
, n
*2+1-i
);
886 static void ssh2_pkt_addmp(Bignum b
) {
889 p
= ssh2_mpint_fmt(b
, &len
);
890 ssh2_pkt_addstring_start();
891 ssh2_pkt_addstring_data(p
, len
);
894 static void ssh2_pkt_send(void) {
895 int cipherblk
, maclen
, padding
, i
;
896 static unsigned long outgoing_sequence
= 0;
899 * Add padding. At least four bytes, and must also bring total
900 * length (minus MAC) up to a multiple of the block size.
902 cipherblk
= cipher ? cipher
->blksize
: 8; /* block size */
903 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
905 padding
+= (cipherblk
- (pktout
.length
+ padding
) % cipherblk
) % cipherblk
;
906 pktout
.data
[4] = padding
;
907 for (i
= 0; i
< padding
; i
++)
908 pktout
.data
[pktout
.length
+ i
] = random_byte();
909 PUT_32BIT(pktout
.data
, pktout
.length
+ padding
- 4);
911 csmac
->generate(pktout
.data
, pktout
.length
+ padding
,
913 outgoing_sequence
++; /* whether or not we MACed */
916 debug(("Sending packet len=%d\r\n", pktout
.length
+padding
));
917 for (i
= 0; i
< pktout
.length
+padding
; i
++)
918 debug((" %02x", (unsigned char)pktout
.data
[i
]));
923 cscipher
->encrypt(pktout
.data
, pktout
.length
+ padding
);
924 maclen
= csmac ? csmac
->len
: 0;
926 s_write(pktout
.data
, pktout
.length
+ padding
+ maclen
);
930 void bndebug(char *string
, Bignum b
) {
933 p
= ssh2_mpint_fmt(b
, &len
);
934 debug(("%s", string
));
935 for (i
= 0; i
< len
; i
++)
936 debug((" %02x", p
[i
]));
942 static void sha_mpint(SHA_State
*s
, Bignum b
) {
945 p
= ssh2_mpint_fmt(b
, &len
);
946 sha_string(s
, p
, len
);
951 * SSH2 packet decode functions.
953 static unsigned long ssh2_pkt_getuint32(void) {
955 if (pktin
.length
- pktin
.savedpos
< 4)
956 return 0; /* arrgh, no way to decline (FIXME?) */
957 value
= GET_32BIT(pktin
.data
+pktin
.savedpos
);
961 static void ssh2_pkt_getstring(char **p
, int *length
) {
963 if (pktin
.length
- pktin
.savedpos
< 4)
965 *length
= GET_32BIT(pktin
.data
+pktin
.savedpos
);
967 if (pktin
.length
- pktin
.savedpos
< *length
)
969 *p
= pktin
.data
+pktin
.savedpos
;
970 pktin
.savedpos
+= *length
;
972 static Bignum
ssh2_pkt_getmp(void) {
977 ssh2_pkt_getstring(&p
, &length
);
981 bombout(("internal error: Can't handle negative mpints"));
984 b
= newbn((length
+1)/2);
985 for (i
= 0; i
< length
; i
++) {
988 b
[j
/2+1] |= ((unsigned char)p
[i
]) << 8;
990 b
[j
/2+1] |= ((unsigned char)p
[i
]);
995 static int do_ssh_init(void) {
999 char vlog
[sizeof(vstring
)+20];
1004 while (s_read(&c
, 1) == 1) {
1005 if (c
== 'S' && i
< 2) i
++;
1006 else if (c
== 'S' && i
== 2) i
= 2;
1007 else if (c
== 'H' && i
== 2) break;
1011 if (s_read(&c
,1) != 1 || c
!= 'S') return 0;
1012 if (s_read(&c
,1) != 1 || c
!= 'S') return 0;
1013 if (s_read(&c
,1) != 1 || c
!= 'H') return 0;
1015 strcpy(vstring
, "SSH-");
1017 if (s_read(&c
,1) != 1 || c
!= '-') return 0;
1020 if (s_read(&c
,1) != 1)
1022 if (vsp
< vstring
+sizeof(vstring
)-1)
1028 } else if (i
< sizeof(version
)-1)
1035 rdpkt2_state
.incoming_sequence
= 0;
1038 sprintf(vlog
, "Server version: %s", vstring
);
1039 vlog
[strcspn(vlog
, "\r\n")] = '\0';
1043 * Server version "1.99" means we can choose whether we use v1
1044 * or v2 protocol. Choice is based on cfg.sshprot.
1046 if (ssh_versioncmp(version
, cfg
.sshprot
== 1 ?
"2.0" : "1.99") >= 0) {
1048 * This is a v2 server. Begin v2 protocol.
1050 char *verstring
= "SSH-2.0-PuTTY";
1053 * Hash our version string and their version string.
1055 sha_string(&exhash
, verstring
, strlen(verstring
));
1056 sha_string(&exhash
, vstring
, strcspn(vstring
, "\r\n"));
1057 sprintf(vstring
, "%s\n", verstring
);
1058 sprintf(vlog
, "We claim version: %s", verstring
);
1060 logevent("Using SSH protocol version 2");
1061 s_write(vstring
, strlen(vstring
));
1062 ssh_protocol
= ssh2_protocol
;
1064 s_rdpkt
= ssh2_rdpkt
;
1067 * This is a v1 server. Begin v1 protocol.
1069 sprintf(vstring
, "SSH-%s-PuTTY\n",
1070 (ssh_versioncmp(version
, "1.5") <= 0 ? version
: "1.5"));
1071 sprintf(vlog
, "We claim version: %s", vstring
);
1072 vlog
[strcspn(vlog
, "\r\n")] = '\0';
1074 logevent("Using SSH protocol version 1");
1075 s_write(vstring
, strlen(vstring
));
1076 ssh_protocol
= ssh1_protocol
;
1078 s_rdpkt
= ssh1_rdpkt
;
1085 * Handle the key exchange and user authentication phases.
1087 static int do_ssh1_login(unsigned char *in
, int inlen
, int ispkt
)
1090 unsigned char *rsabuf
, *keystr1
, *keystr2
;
1091 unsigned char cookie
[8];
1092 struct RSAKey servkey
, hostkey
;
1093 struct MD5Context md5c
;
1094 static unsigned long supported_ciphers_mask
, supported_auths_mask
;
1095 static int tried_publickey
;
1096 static unsigned char session_id
[16];
1098 static char username
[100];
1102 if (!ispkt
) crWaitUntil(ispkt
);
1104 if (pktin
.type
!= SSH1_SMSG_PUBLIC_KEY
) {
1105 bombout(("Public key packet not received"));
1109 logevent("Received public keys");
1111 memcpy(cookie
, pktin
.body
, 8);
1113 i
= makekey(pktin
.body
+8, &servkey
, &keystr1
, 0);
1114 j
= makekey(pktin
.body
+8+i
, &hostkey
, &keystr2
, 0);
1117 * Log the host key fingerprint.
1121 logevent("Host key fingerprint is:");
1122 strcpy(logmsg
, " ");
1123 hostkey
.comment
= NULL
;
1124 rsa_fingerprint(logmsg
+strlen(logmsg
), sizeof(logmsg
)-strlen(logmsg
),
1129 supported_ciphers_mask
= GET_32BIT(pktin
.body
+12+i
+j
);
1130 supported_auths_mask
= GET_32BIT(pktin
.body
+16+i
+j
);
1133 MD5Update(&md5c
, keystr2
, hostkey
.bytes
);
1134 MD5Update(&md5c
, keystr1
, servkey
.bytes
);
1135 MD5Update(&md5c
, pktin
.body
, 8);
1136 MD5Final(session_id
, &md5c
);
1138 for (i
=0; i
<32; i
++)
1139 session_key
[i
] = random_byte();
1141 len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
1143 rsabuf
= malloc(len
);
1145 fatalbox("Out of memory");
1148 * Verify the host key.
1152 * First format the key into a string.
1154 int len
= rsastr_len(&hostkey
);
1155 char fingerprint
[100];
1156 char *keystr
= malloc(len
);
1158 fatalbox("Out of memory");
1159 rsastr_fmt(keystr
, &hostkey
);
1160 rsa_fingerprint(fingerprint
, sizeof(fingerprint
), &hostkey
);
1161 verify_ssh_host_key(savedhost
, savedport
, "rsa", keystr
, fingerprint
);
1165 for (i
=0; i
<32; i
++) {
1166 rsabuf
[i
] = session_key
[i
];
1168 rsabuf
[i
] ^= session_id
[i
];
1171 if (hostkey
.bytes
> servkey
.bytes
) {
1172 rsaencrypt(rsabuf
, 32, &servkey
);
1173 rsaencrypt(rsabuf
, servkey
.bytes
, &hostkey
);
1175 rsaencrypt(rsabuf
, 32, &hostkey
);
1176 rsaencrypt(rsabuf
, hostkey
.bytes
, &servkey
);
1179 logevent("Encrypted session key");
1181 cipher_type
= cfg
.cipher
== CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH
:
1182 cfg
.cipher
== CIPHER_DES ? SSH_CIPHER_DES
:
1184 if ((supported_ciphers_mask
& (1 << cipher_type
)) == 0) {
1185 c_write("Selected cipher not supported, falling back to 3DES\r\n", 53);
1186 cipher_type
= SSH_CIPHER_3DES
;
1188 switch (cipher_type
) {
1189 case SSH_CIPHER_3DES
: logevent("Using 3DES encryption"); break;
1190 case SSH_CIPHER_DES
: logevent("Using single-DES encryption"); break;
1191 case SSH_CIPHER_BLOWFISH
: logevent("Using Blowfish encryption"); break;
1194 send_packet(SSH1_CMSG_SESSION_KEY
,
1195 PKT_CHAR
, cipher_type
,
1196 PKT_DATA
, cookie
, 8,
1197 PKT_CHAR
, (len
*8) >> 8, PKT_CHAR
, (len
*8) & 0xFF,
1198 PKT_DATA
, rsabuf
, len
,
1202 logevent("Trying to enable encryption...");
1206 cipher
= cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish_ssh1
:
1207 cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
1209 cipher
->sesskey(session_key
);
1213 if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1214 bombout(("Encryption not successfully enabled"));
1218 logevent("Successfully started encryption");
1224 if ((flags
& FLAG_INTERACTIVE
) && !*cfg
.username
) {
1225 c_write("login as: ", 10);
1228 crWaitUntil(!ispkt
);
1229 while (inlen
--) switch (c
= *in
++) {
1236 c_write("\b \b", 3);
1242 c_write("\b \b", 3);
1251 if (((c
>= ' ' && c
<= '~') ||
1252 ((unsigned char)c
>= 160)) && pos
< 40) {
1253 username
[pos
++] = c
;
1260 username
[strcspn(username
, "\n\r")] = '\0';
1263 strncpy(username
, cfg
.username
, 99);
1264 username
[99] = '\0';
1265 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
1266 sprintf(stuff
, "Sent username \"%s\".\r\n", username
);
1267 c_write(stuff
, strlen(stuff
));
1271 send_packet(SSH1_CMSG_USER
, PKT_STR
, username
, PKT_END
);
1273 char userlog
[20+sizeof(username
)];
1274 sprintf(userlog
, "Sent username \"%s\"", username
);
1281 tried_publickey
= 0;
1283 while (pktin
.type
== SSH1_SMSG_FAILURE
) {
1284 static char password
[100];
1285 static char prompt
[200];
1288 static int pwpkt_type
;
1290 * Show password prompt, having first obtained it via a TIS
1291 * or CryptoCard exchange if we're doing TIS or CryptoCard
1294 pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
1295 if (agent_exists()) {
1297 * Attempt RSA authentication using Pageant.
1299 static unsigned char request
[5], *response
, *p
;
1300 static int responselen
;
1301 static int i
, nkeys
;
1302 static int authed
= FALSE
;
1305 logevent("Pageant is running. Requesting keys.");
1307 /* Request the keys held by the agent. */
1308 PUT_32BIT(request
, 1);
1309 request
[4] = SSH_AGENTC_REQUEST_RSA_IDENTITIES
;
1310 agent_query(request
, 5, &r
, &responselen
);
1311 response
= (unsigned char *)r
;
1314 nkeys
= GET_32BIT(p
); p
+= 4;
1315 { char buf
[64]; sprintf(buf
, "Pageant has %d keys", nkeys
);
1317 for (i
= 0; i
< nkeys
; i
++) {
1318 static struct RSAKey key
;
1319 static Bignum challenge
;
1320 static char *commentp
;
1321 static int commentlen
;
1323 { char buf
[64]; sprintf(buf
, "Trying Pageant key #%d", i
);
1326 p
+= ssh1_read_bignum(p
, &key
.exponent
);
1327 p
+= ssh1_read_bignum(p
, &key
.modulus
);
1328 commentlen
= GET_32BIT(p
); p
+= 4;
1329 commentp
= p
; p
+= commentlen
;
1330 send_packet(SSH1_CMSG_AUTH_RSA
,
1331 PKT_BIGNUM
, key
.modulus
, PKT_END
);
1333 if (pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
1334 logevent("Key refused");
1337 logevent("Received RSA challenge");
1338 ssh1_read_bignum(pktin
.body
, &challenge
);
1340 char *agentreq
, *q
, *ret
;
1342 len
= 1 + 4; /* message type, bit count */
1343 len
+= ssh1_bignum_length(key
.exponent
);
1344 len
+= ssh1_bignum_length(key
.modulus
);
1345 len
+= ssh1_bignum_length(challenge
);
1346 len
+= 16; /* session id */
1347 len
+= 4; /* response format */
1348 agentreq
= malloc(4 + len
);
1349 PUT_32BIT(agentreq
, len
);
1351 *q
++ = SSH_AGENTC_RSA_CHALLENGE
;
1352 PUT_32BIT(q
, ssh1_bignum_bitcount(key
.modulus
));
1354 q
+= ssh1_write_bignum(q
, key
.exponent
);
1355 q
+= ssh1_write_bignum(q
, key
.modulus
);
1356 q
+= ssh1_write_bignum(q
, challenge
);
1357 memcpy(q
, session_id
, 16); q
+= 16;
1358 PUT_32BIT(q
, 1); /* response format */
1359 agent_query(agentreq
, len
+4, &ret
, &retlen
);
1362 if (ret
[4] == SSH_AGENT_RSA_RESPONSE
) {
1363 logevent("Sending Pageant's response");
1364 send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE
,
1365 PKT_DATA
, ret
+5, 16, PKT_END
);
1368 if (pktin
.type
== SSH1_SMSG_SUCCESS
) {
1369 logevent("Pageant's response accepted");
1370 if (flags
& FLAG_VERBOSE
) {
1371 c_write("Authenticated using RSA key \"",
1373 c_write(commentp
, commentlen
);
1374 c_write("\" from agent\r\n", 14);
1378 logevent("Pageant's response not accepted");
1380 logevent("Pageant failed to answer challenge");
1384 logevent("No reply received from Pageant");
1387 freebn(key
.exponent
);
1388 freebn(key
.modulus
);
1397 if (*cfg
.keyfile
&& !tried_publickey
)
1398 pwpkt_type
= SSH1_CMSG_AUTH_RSA
;
1400 if (pktin
.type
== SSH1_SMSG_FAILURE
&&
1402 (supported_auths_mask
& (1<<SSH1_AUTH_TIS
))) {
1403 pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
1404 logevent("Requested TIS authentication");
1405 send_packet(SSH1_CMSG_AUTH_TIS
, PKT_END
);
1407 if (pktin
.type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
1408 logevent("TIS authentication declined");
1409 if (flags
& FLAG_INTERACTIVE
)
1410 c_write("TIS authentication refused.\r\n", 29);
1412 int challengelen
= ((pktin
.body
[0] << 24) |
1413 (pktin
.body
[1] << 16) |
1414 (pktin
.body
[2] << 8) |
1416 logevent("Received TIS challenge");
1417 if (challengelen
> sizeof(prompt
)-1)
1418 challengelen
= sizeof(prompt
)-1; /* prevent overrun */
1419 memcpy(prompt
, pktin
.body
+4, challengelen
);
1420 prompt
[challengelen
] = '\0';
1423 if (pktin
.type
== SSH1_SMSG_FAILURE
&&
1425 (supported_auths_mask
& (1<<SSH1_AUTH_CCARD
))) {
1426 pwpkt_type
= SSH1_CMSG_AUTH_CCARD_RESPONSE
;
1427 logevent("Requested CryptoCard authentication");
1428 send_packet(SSH1_CMSG_AUTH_CCARD
, PKT_END
);
1430 if (pktin
.type
!= SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
1431 logevent("CryptoCard authentication declined");
1432 c_write("CryptoCard authentication refused.\r\n", 29);
1434 int challengelen
= ((pktin
.body
[0] << 24) |
1435 (pktin
.body
[1] << 16) |
1436 (pktin
.body
[2] << 8) |
1438 logevent("Received CryptoCard challenge");
1439 if (challengelen
> sizeof(prompt
)-1)
1440 challengelen
= sizeof(prompt
)-1; /* prevent overrun */
1441 memcpy(prompt
, pktin
.body
+4, challengelen
);
1442 strncpy(prompt
+ challengelen
, "\r\nResponse : ",
1443 sizeof(prompt
)-challengelen
);
1444 prompt
[sizeof(prompt
)-1] = '\0';
1447 if (pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
1448 sprintf(prompt
, "%.90s@%.90s's password: ",
1449 username
, savedhost
);
1451 if (pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
1452 char *comment
= NULL
;
1453 if (flags
& FLAG_VERBOSE
)
1454 c_write("Trying public key authentication.\r\n", 35);
1455 if (!rsakey_encrypted(cfg
.keyfile
, &comment
)) {
1456 if (flags
& FLAG_VERBOSE
)
1457 c_write("No passphrase required.\r\n", 25);
1460 sprintf(prompt
, "Passphrase for key \"%.100s\": ", comment
);
1464 if (ssh_get_password
) {
1465 if (!ssh_get_password(prompt
, password
, sizeof(password
))) {
1467 * get_password failed to get a password (for
1468 * example because one was supplied on the command
1469 * line which has already failed to work).
1472 logevent("No more passwords to try");
1473 ssh_state
= SSH_STATE_CLOSED
;
1477 c_write(prompt
, strlen(prompt
));
1481 crWaitUntil(!ispkt
);
1482 while (inlen
--) switch (c
= *in
++) {
1499 if (((c
>= ' ' && c
<= '~') ||
1500 ((unsigned char)c
>= 160)) && pos
< sizeof(password
))
1501 password
[pos
++] = c
;
1509 if (pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
1511 * Try public key authentication with the specified
1514 static struct RSAKey pubkey
;
1515 static Bignum challenge
, response
;
1517 static unsigned char buffer
[32];
1519 tried_publickey
= 1;
1520 i
= loadrsakey(cfg
.keyfile
, &pubkey
, password
);
1522 c_write("Couldn't load public key from ", 30);
1523 c_write(cfg
.keyfile
, strlen(cfg
.keyfile
));
1524 c_write(".\r\n", 3);
1525 continue; /* go and try password */
1528 c_write("Wrong passphrase.\r\n", 19);
1529 tried_publickey
= 0;
1530 continue; /* try again */
1534 * Send a public key attempt.
1536 send_packet(SSH1_CMSG_AUTH_RSA
,
1537 PKT_BIGNUM
, pubkey
.modulus
, PKT_END
);
1540 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1541 c_write("Server refused our public key.\r\n", 32);
1542 continue; /* go and try password */
1544 if (pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
1545 bombout(("Bizarre response to offer of public key"));
1548 ssh1_read_bignum(pktin
.body
, &challenge
);
1549 response
= rsadecrypt(challenge
, &pubkey
);
1550 freebn(pubkey
.private_exponent
); /* burn the evidence */
1552 for (i
= 0; i
< 32; i
+= 2) {
1553 buffer
[i
] = response
[16-i
/2] >> 8;
1554 buffer
[i
+1] = response
[16-i
/2] & 0xFF;
1558 MD5Update(&md5c
, buffer
, 32);
1559 MD5Update(&md5c
, session_id
, 16);
1560 MD5Final(buffer
, &md5c
);
1562 send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE
,
1563 PKT_DATA
, buffer
, 16, PKT_END
);
1566 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1567 if (flags
& FLAG_VERBOSE
)
1568 c_write("Failed to authenticate with our public key.\r\n",
1570 continue; /* go and try password */
1571 } else if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1572 bombout(("Bizarre response to RSA authentication response"));
1576 break; /* we're through! */
1578 send_packet(pwpkt_type
, PKT_STR
, password
, PKT_END
);
1580 logevent("Sent password");
1581 memset(password
, 0, strlen(password
));
1583 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1584 if (flags
& FLAG_VERBOSE
)
1585 c_write("Access denied\r\n", 15);
1586 logevent("Authentication refused");
1587 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1588 logevent("Received disconnect request");
1589 ssh_state
= SSH_STATE_CLOSED
;
1591 } else if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1592 bombout(("Strange packet received, type %d", pktin
.type
));
1597 logevent("Authentication successful");
1602 static void ssh1_protocol(unsigned char *in
, int inlen
, int ispkt
) {
1607 while (!do_ssh1_login(in
, inlen
, ispkt
)) {
1610 if (ssh_state
== SSH_STATE_CLOSED
)
1613 if (cfg
.agentfwd
&& agent_exists()) {
1614 logevent("Requesting agent forwarding");
1615 send_packet(SSH1_CMSG_AGENT_REQUEST_FORWARDING
, PKT_END
);
1616 do { crReturnV
; } while (!ispkt
);
1617 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1618 bombout(("Protocol confusion"));
1620 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1621 logevent("Agent forwarding refused");
1623 logevent("Agent forwarding enabled");
1627 send_packet(SSH1_CMSG_REQUEST_PTY
,
1628 PKT_STR
, cfg
.termtype
,
1629 PKT_INT
, rows
, PKT_INT
, cols
,
1630 PKT_INT
, 0, PKT_INT
, 0,
1633 ssh_state
= SSH_STATE_INTERMED
;
1634 do { crReturnV
; } while (!ispkt
);
1635 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1636 bombout(("Protocol confusion"));
1638 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1639 c_write("Server refused to allocate pty\r\n", 32);
1641 logevent("Allocated pty");
1644 if (*cfg
.remote_cmd
)
1645 send_packet(SSH1_CMSG_EXEC_CMD
, PKT_STR
, cfg
.remote_cmd
, PKT_END
);
1647 send_packet(SSH1_CMSG_EXEC_SHELL
, PKT_END
);
1648 logevent("Started session");
1650 ssh_state
= SSH_STATE_SESSION
;
1655 ssh_channels
= newtree234(ssh_channelcmp
);
1660 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
1661 pktin
.type
== SSH1_SMSG_STDERR_DATA
) {
1662 long len
= GET_32BIT(pktin
.body
);
1663 c_writedata(pktin
.body
+4, len
);
1664 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1665 ssh_state
= SSH_STATE_CLOSED
;
1666 logevent("Received disconnect request");
1667 } else if (pktin
.type
== SSH1_SMSG_AGENT_OPEN
) {
1668 /* Remote side is trying to open a channel to talk to our
1669 * agent. Give them back a local channel number. */
1671 struct ssh_channel
*c
;
1673 for (c
= first234(ssh_channels
, &e
); c
; c
= next234(&e
)) {
1675 break; /* found a free number */
1678 c
= malloc(sizeof(struct ssh_channel
));
1679 c
->remoteid
= GET_32BIT(pktin
.body
);
1682 c
->type
= SSH1_SMSG_AGENT_OPEN
; /* identify channel type */
1683 c
->u
.a
.lensofar
= 0;
1684 add234(ssh_channels
, c
);
1685 send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
1686 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
1688 } else if (pktin
.type
== SSH1_MSG_CHANNEL_CLOSE
||
1689 pktin
.type
== SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
) {
1690 /* Remote side closes a channel. */
1691 unsigned i
= GET_32BIT(pktin
.body
);
1692 struct ssh_channel
*c
;
1693 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
1696 closetype
= (pktin
.type
== SSH1_MSG_CHANNEL_CLOSE ?
1 : 2);
1697 send_packet(pktin
.type
, PKT_INT
, c
->remoteid
, PKT_END
);
1698 c
->closes
|= closetype
;
1699 if (c
->closes
== 3) {
1700 del234(ssh_channels
, c
);
1704 } else if (pktin
.type
== SSH1_MSG_CHANNEL_DATA
) {
1705 /* Data sent down one of our channels. */
1706 int i
= GET_32BIT(pktin
.body
);
1707 int len
= GET_32BIT(pktin
.body
+4);
1708 unsigned char *p
= pktin
.body
+8;
1709 struct ssh_channel
*c
;
1710 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
1713 case SSH1_SMSG_AGENT_OPEN
:
1714 /* Data for an agent message. Buffer it. */
1716 if (c
->u
.a
.lensofar
< 4) {
1717 int l
= min(4 - c
->u
.a
.lensofar
, len
);
1718 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
, p
, l
);
1719 p
+= l
; len
-= l
; c
->u
.a
.lensofar
+= l
;
1721 if (c
->u
.a
.lensofar
== 4) {
1722 c
->u
.a
.totallen
= 4 + GET_32BIT(c
->u
.a
.msglen
);
1723 c
->u
.a
.message
= malloc(c
->u
.a
.totallen
);
1724 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
1726 if (c
->u
.a
.lensofar
>= 4 && len
> 0) {
1727 int l
= min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
, len
);
1728 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
, p
, l
);
1729 p
+= l
; len
-= l
; c
->u
.a
.lensofar
+= l
;
1731 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
1732 void *reply
, *sentreply
;
1734 agent_query(c
->u
.a
.message
, c
->u
.a
.totallen
,
1739 /* Fake SSH_AGENT_FAILURE. */
1740 sentreply
= "\0\0\0\1\5";
1743 send_packet(SSH1_MSG_CHANNEL_DATA
,
1744 PKT_INT
, c
->remoteid
,
1746 PKT_DATA
, sentreply
, replylen
,
1750 free(c
->u
.a
.message
);
1751 c
->u
.a
.lensofar
= 0;
1757 } else if (pktin
.type
== SSH1_SMSG_SUCCESS
) {
1758 /* may be from EXEC_SHELL on some servers */
1759 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1760 /* may be from EXEC_SHELL on some servers
1761 * if no pty is available or in other odd cases. Ignore */
1762 } else if (pktin
.type
== SSH1_SMSG_EXIT_STATUS
) {
1763 send_packet(SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
1765 bombout(("Strange packet received: type %d", pktin
.type
));
1769 send_packet(SSH1_CMSG_STDIN_DATA
,
1770 PKT_INT
, inlen
, PKT_DATA
, in
, inlen
, PKT_END
);
1778 * Utility routine for decoding comma-separated strings in KEXINIT.
1780 static int in_commasep_string(char *needle
, char *haystack
, int haylen
) {
1781 int needlen
= strlen(needle
);
1784 * Is it at the start of the string?
1786 if (haylen
>= needlen
&& /* haystack is long enough */
1787 !memcmp(needle
, haystack
, needlen
) && /* initial match */
1788 (haylen
== needlen
|| haystack
[needlen
] == ',')
1789 /* either , or EOS follows */
1793 * If not, search for the next comma and resume after that.
1794 * If no comma found, terminate.
1796 while (haylen
> 0 && *haystack
!= ',')
1797 haylen
--, haystack
++;
1800 haylen
--, haystack
++; /* skip over comma itself */
1805 * SSH2 key creation method.
1807 static void ssh2_mkkey(Bignum K
, char *H
, char chr
, char *keyspace
) {
1809 /* First 20 bytes. */
1812 SHA_Bytes(&s
, H
, 20);
1813 SHA_Bytes(&s
, &chr
, 1);
1814 SHA_Bytes(&s
, H
, 20);
1815 SHA_Final(&s
, keyspace
);
1816 /* Next 20 bytes. */
1819 SHA_Bytes(&s
, H
, 20);
1820 SHA_Bytes(&s
, keyspace
, 20);
1821 SHA_Final(&s
, keyspace
+20);
1825 * Handle the SSH2 transport layer.
1827 static int do_ssh2_transport(unsigned char *in
, int inlen
, int ispkt
)
1831 static Bignum e
, f
, K
;
1832 static const struct ssh_mac
**maclist
;
1833 static const struct ssh_cipher
*cscipher_tobe
= NULL
;
1834 static const struct ssh_cipher
*sccipher_tobe
= NULL
;
1835 static const struct ssh_mac
*csmac_tobe
= NULL
;
1836 static const struct ssh_mac
*scmac_tobe
= NULL
;
1837 static const struct ssh_compress
*cscomp_tobe
= NULL
;
1838 static const struct ssh_compress
*sccomp_tobe
= NULL
;
1839 static char *hostkeydata
, *sigdata
, *keystr
, *fingerprint
;
1840 static int hostkeylen
, siglen
;
1841 static unsigned char exchange_hash
[20];
1842 static unsigned char keyspace
[40];
1843 static const struct ssh_cipher
*preferred_cipher
;
1849 * Set up the preferred cipher.
1851 if (cfg
.cipher
== CIPHER_BLOWFISH
) {
1852 preferred_cipher
= &ssh_blowfish_ssh2
;
1853 } else if (cfg
.cipher
== CIPHER_DES
) {
1854 logevent("Single DES not supported in SSH2; using 3DES");
1855 preferred_cipher
= &ssh_3des_ssh2
;
1856 } else if (cfg
.cipher
== CIPHER_3DES
) {
1857 preferred_cipher
= &ssh_3des_ssh2
;
1859 /* Shouldn't happen, but we do want to initialise to _something_. */
1860 preferred_cipher
= &ssh_3des_ssh2
;
1864 * Be prepared to work around the buggy MAC problem.
1867 maclist
= buggymacs
;
1873 * Construct and send our key exchange packet.
1875 ssh2_pkt_init(SSH2_MSG_KEXINIT
);
1876 for (i
= 0; i
< 16; i
++)
1877 ssh2_pkt_addbyte((unsigned char)random_byte());
1878 /* List key exchange algorithms. */
1879 ssh2_pkt_addstring_start();
1880 for (i
= 0; i
< lenof(kex_algs
); i
++) {
1881 ssh2_pkt_addstring_str(kex_algs
[i
]->name
);
1882 if (i
< lenof(kex_algs
)-1)
1883 ssh2_pkt_addstring_str(",");
1885 /* List server host key algorithms. */
1886 ssh2_pkt_addstring_start();
1887 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
1888 ssh2_pkt_addstring_str(hostkey_algs
[i
]->name
);
1889 if (i
< lenof(hostkey_algs
)-1)
1890 ssh2_pkt_addstring_str(",");
1892 /* List client->server encryption algorithms. */
1893 ssh2_pkt_addstring_start();
1894 for (i
= 0; i
< lenof(ciphers
)+1; i
++) {
1895 const struct ssh_cipher
*c
= i
==0 ? preferred_cipher
: ciphers
[i
-1];
1896 ssh2_pkt_addstring_str(c
->name
);
1897 if (i
< lenof(ciphers
))
1898 ssh2_pkt_addstring_str(",");
1900 /* List server->client encryption algorithms. */
1901 ssh2_pkt_addstring_start();
1902 for (i
= 0; i
< lenof(ciphers
)+1; i
++) {
1903 const struct ssh_cipher
*c
= i
==0 ? preferred_cipher
: ciphers
[i
-1];
1904 ssh2_pkt_addstring_str(c
->name
);
1905 if (i
< lenof(ciphers
))
1906 ssh2_pkt_addstring_str(",");
1908 /* List client->server MAC algorithms. */
1909 ssh2_pkt_addstring_start();
1910 for (i
= 0; i
< lenof(maclist
); i
++) {
1911 ssh2_pkt_addstring_str(maclist
[i
]->name
);
1912 if (i
< lenof(maclist
)-1)
1913 ssh2_pkt_addstring_str(",");
1915 /* List server->client MAC algorithms. */
1916 ssh2_pkt_addstring_start();
1917 for (i
= 0; i
< lenof(maclist
); i
++) {
1918 ssh2_pkt_addstring_str(maclist
[i
]->name
);
1919 if (i
< lenof(maclist
)-1)
1920 ssh2_pkt_addstring_str(",");
1922 /* List client->server compression algorithms. */
1923 ssh2_pkt_addstring_start();
1924 for (i
= 0; i
< lenof(compressions
); i
++) {
1925 ssh2_pkt_addstring_str(compressions
[i
]->name
);
1926 if (i
< lenof(compressions
)-1)
1927 ssh2_pkt_addstring_str(",");
1929 /* List server->client compression algorithms. */
1930 ssh2_pkt_addstring_start();
1931 for (i
= 0; i
< lenof(compressions
); i
++) {
1932 ssh2_pkt_addstring_str(compressions
[i
]->name
);
1933 if (i
< lenof(compressions
)-1)
1934 ssh2_pkt_addstring_str(",");
1936 /* List client->server languages. Empty list. */
1937 ssh2_pkt_addstring_start();
1938 /* List server->client languages. Empty list. */
1939 ssh2_pkt_addstring_start();
1940 /* First KEX packet does _not_ follow, because we're not that brave. */
1941 ssh2_pkt_addbool(FALSE
);
1943 ssh2_pkt_adduint32(0);
1944 sha_string(&exhash
, pktout
.data
+5, pktout
.length
-5);
1947 if (!ispkt
) crWaitUntil(ispkt
);
1948 sha_string(&exhash
, pktin
.data
+5, pktin
.length
-5);
1951 * Now examine the other side's KEXINIT to see what we're up
1954 if (pktin
.type
!= SSH2_MSG_KEXINIT
) {
1955 bombout(("expected key exchange packet from server"));
1958 kex
= NULL
; hostkey
= NULL
; cscipher_tobe
= NULL
; sccipher_tobe
= NULL
;
1959 csmac_tobe
= NULL
; scmac_tobe
= NULL
; cscomp_tobe
= NULL
; sccomp_tobe
= NULL
;
1960 pktin
.savedpos
+= 16; /* skip garbage cookie */
1961 ssh2_pkt_getstring(&str
, &len
); /* key exchange algorithms */
1962 for (i
= 0; i
< lenof(kex_algs
); i
++) {
1963 if (in_commasep_string(kex_algs
[i
]->name
, str
, len
)) {
1968 ssh2_pkt_getstring(&str
, &len
); /* host key algorithms */
1969 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
1970 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
1971 hostkey
= hostkey_algs
[i
];
1975 ssh2_pkt_getstring(&str
, &len
); /* client->server cipher */
1976 for (i
= 0; i
< lenof(ciphers
)+1; i
++) {
1977 const struct ssh_cipher
*c
= i
==0 ? preferred_cipher
: ciphers
[i
-1];
1978 if (in_commasep_string(c
->name
, str
, len
)) {
1983 ssh2_pkt_getstring(&str
, &len
); /* server->client cipher */
1984 for (i
= 0; i
< lenof(ciphers
)+1; i
++) {
1985 const struct ssh_cipher
*c
= i
==0 ? preferred_cipher
: ciphers
[i
-1];
1986 if (in_commasep_string(c
->name
, str
, len
)) {
1991 ssh2_pkt_getstring(&str
, &len
); /* client->server mac */
1992 for (i
= 0; i
< lenof(maclist
); i
++) {
1993 if (in_commasep_string(maclist
[i
]->name
, str
, len
)) {
1994 csmac_tobe
= maclist
[i
];
1998 ssh2_pkt_getstring(&str
, &len
); /* server->client mac */
1999 for (i
= 0; i
< lenof(maclist
); i
++) {
2000 if (in_commasep_string(maclist
[i
]->name
, str
, len
)) {
2001 scmac_tobe
= maclist
[i
];
2005 ssh2_pkt_getstring(&str
, &len
); /* client->server compression */
2006 for (i
= 0; i
< lenof(compressions
); i
++) {
2007 if (in_commasep_string(compressions
[i
]->name
, str
, len
)) {
2008 cscomp_tobe
= compressions
[i
];
2012 ssh2_pkt_getstring(&str
, &len
); /* server->client compression */
2013 for (i
= 0; i
< lenof(compressions
); i
++) {
2014 if (in_commasep_string(compressions
[i
]->name
, str
, len
)) {
2015 sccomp_tobe
= compressions
[i
];
2021 * Currently we only support Diffie-Hellman and DSS, so let's
2022 * bomb out if those aren't selected.
2024 if (kex
!= &ssh_diffiehellman
|| hostkey
!= &ssh_dss
) {
2025 bombout(("internal fault: chaos in SSH 2 transport layer"));
2030 * Now we begin the fun. Generate and send e for Diffie-Hellman.
2033 ssh2_pkt_init(SSH2_MSG_KEXDH_INIT
);
2038 if (pktin
.type
!= SSH2_MSG_KEXDH_REPLY
) {
2039 bombout(("expected key exchange packet from server"));
2042 ssh2_pkt_getstring(&hostkeydata
, &hostkeylen
);
2043 f
= ssh2_pkt_getmp();
2044 ssh2_pkt_getstring(&sigdata
, &siglen
);
2048 sha_string(&exhash
, hostkeydata
, hostkeylen
);
2049 sha_mpint(&exhash
, e
);
2050 sha_mpint(&exhash
, f
);
2051 sha_mpint(&exhash
, K
);
2052 SHA_Final(&exhash
, exchange_hash
);
2055 debug(("Exchange hash is:\r\n"));
2056 for (i
= 0; i
< 20; i
++)
2057 debug((" %02x", exchange_hash
[i
]));
2061 hostkey
->setkey(hostkeydata
, hostkeylen
);
2062 if (!hostkey
->verifysig(sigdata
, siglen
, exchange_hash
, 20)) {
2063 bombout(("Server failed host key check"));
2068 * Expect SSH2_MSG_NEWKEYS from server.
2071 if (pktin
.type
!= SSH2_MSG_NEWKEYS
) {
2072 bombout(("expected new-keys packet from server"));
2077 * Authenticate remote host: verify host key. (We've already
2078 * checked the signature of the exchange hash.)
2080 keystr
= hostkey
->fmtkey();
2081 fingerprint
= hostkey
->fingerprint();
2082 verify_ssh_host_key(savedhost
, savedport
, hostkey
->keytype
,
2083 keystr
, fingerprint
);
2084 logevent("Host key fingerprint is:");
2085 logevent(fingerprint
);
2090 * Send SSH2_MSG_NEWKEYS.
2092 ssh2_pkt_init(SSH2_MSG_NEWKEYS
);
2096 * Create and initialise session keys.
2098 cscipher
= cscipher_tobe
;
2099 sccipher
= sccipher_tobe
;
2102 cscomp
= cscomp_tobe
;
2103 sccomp
= sccomp_tobe
;
2105 * Set IVs after keys.
2107 ssh2_mkkey(K
, exchange_hash
, 'C', keyspace
); cscipher
->setcskey(keyspace
);
2108 ssh2_mkkey(K
, exchange_hash
, 'D', keyspace
); cscipher
->setsckey(keyspace
);
2109 ssh2_mkkey(K
, exchange_hash
, 'A', keyspace
); cscipher
->setcsiv(keyspace
);
2110 ssh2_mkkey(K
, exchange_hash
, 'B', keyspace
); sccipher
->setsciv(keyspace
);
2111 ssh2_mkkey(K
, exchange_hash
, 'E', keyspace
); csmac
->setcskey(keyspace
);
2112 ssh2_mkkey(K
, exchange_hash
, 'F', keyspace
); scmac
->setsckey(keyspace
);
2115 * Now we're encrypting. Begin returning 1 to the protocol main
2116 * function so that other things can run on top of the
2117 * transport. If we ever see a KEXINIT, we must go back to the
2122 } while (!(ispkt
&& pktin
.type
== SSH2_MSG_KEXINIT
));
2123 goto begin_key_exchange
;
2129 * Handle the SSH2 userauth and connection layers.
2131 static void do_ssh2_authconn(unsigned char *in
, int inlen
, int ispkt
)
2133 static unsigned long remote_winsize
;
2134 static unsigned long remote_maxpkt
;
2139 * Request userauth protocol, and await a response to it.
2141 ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST
);
2142 ssh2_pkt_addstring("ssh-userauth");
2144 crWaitUntilV(ispkt
);
2145 if (pktin
.type
!= SSH2_MSG_SERVICE_ACCEPT
) {
2146 bombout(("Server refused user authentication protocol"));
2151 * FIXME: currently we support only password authentication.
2152 * (This places us technically in violation of the SSH2 spec.
2153 * We must fix this.)
2157 * Get a username and a password.
2159 static char username
[100];
2160 static char password
[100];
2164 if ((flags
& FLAG_INTERACTIVE
) && !*cfg
.username
) {
2165 c_write("login as: ", 10);
2168 crWaitUntilV(!ispkt
);
2169 while (inlen
--) switch (c
= *in
++) {
2176 c_write("\b \b", 3);
2182 c_write("\b \b", 3);
2191 if (((c
>= ' ' && c
<= '~') ||
2192 ((unsigned char)c
>= 160)) && pos
< 40) {
2193 username
[pos
++] = c
;
2200 username
[strcspn(username
, "\n\r")] = '\0';
2203 strncpy(username
, cfg
.username
, 99);
2204 username
[99] = '\0';
2205 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
2206 sprintf(stuff
, "Using username \"%s\".\r\n", username
);
2207 c_write(stuff
, strlen(stuff
));
2211 if (ssh_get_password
) {
2213 sprintf(prompt
, "%.90s@%.90s's password: ", username
, savedhost
);
2214 if (!ssh_get_password(prompt
, password
, sizeof(password
))) {
2216 * get_password failed to get a password (for
2217 * example because one was supplied on the command
2218 * line which has already failed to work).
2221 logevent("No more passwords to try");
2222 ssh_state
= SSH_STATE_CLOSED
;
2226 c_write("password: ", 10);
2231 crWaitUntilV(!ispkt
);
2232 while (inlen
--) switch (c
= *in
++) {
2249 if (((c
>= ' ' && c
<= '~') ||
2250 ((unsigned char)c
>= 160)) && pos
< 40)
2251 password
[pos
++] = c
;
2258 ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
2259 ssh2_pkt_addstring(username
);
2260 ssh2_pkt_addstring("ssh-connection"); /* service requested */
2261 ssh2_pkt_addstring("password");
2262 ssh2_pkt_addbool(FALSE
);
2263 ssh2_pkt_addstring(password
);
2266 crWaitUntilV(ispkt
);
2267 if (pktin
.type
!= SSH2_MSG_USERAUTH_SUCCESS
) {
2268 c_write("Access denied\r\n", 15);
2269 logevent("Authentication refused");
2275 * Now we're authenticated for the connection protocol. The
2276 * connection protocol will automatically have started at this
2277 * point; there's no need to send SERVICE_REQUEST.
2281 * So now create a channel with a session in it.
2283 mainchan
= malloc(sizeof(struct ssh_channel
));
2284 mainchan
->localid
= 100; /* as good as any */
2285 ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
2286 ssh2_pkt_addstring("session");
2287 ssh2_pkt_adduint32(mainchan
->localid
);
2288 ssh2_pkt_adduint32(0x7FFFFFFFUL
); /* our window size */
2289 ssh2_pkt_adduint32(0x4000UL
); /* our max pkt size */
2291 crWaitUntilV(ispkt
);
2292 if (pktin
.type
!= SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
2293 bombout(("Server refused to open a session"));
2295 /* FIXME: error data comes back in FAILURE packet */
2297 if (ssh2_pkt_getuint32() != mainchan
->localid
) {
2298 bombout(("Server's channel confirmation cited wrong channel"));
2301 mainchan
->remoteid
= ssh2_pkt_getuint32();
2302 mainchan
->u
.v2
.remwindow
= ssh2_pkt_getuint32();
2303 mainchan
->u
.v2
.remmaxpkt
= ssh2_pkt_getuint32();
2304 mainchan
->u
.v2
.outbuffer
= NULL
;
2305 mainchan
->u
.v2
.outbuflen
= mainchan
->u
.v2
.outbufsize
= 0;
2306 logevent("Opened channel for session");
2309 * Now allocate a pty for the session.
2312 ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
2313 ssh2_pkt_adduint32(mainchan
->remoteid
); /* recipient channel */
2314 ssh2_pkt_addstring("pty-req");
2315 ssh2_pkt_addbool(1); /* want reply */
2316 ssh2_pkt_addstring(cfg
.termtype
);
2317 ssh2_pkt_adduint32(cols
);
2318 ssh2_pkt_adduint32(rows
);
2319 ssh2_pkt_adduint32(0); /* pixel width */
2320 ssh2_pkt_adduint32(0); /* pixel height */
2321 ssh2_pkt_addstring_start();
2322 ssh2_pkt_addstring_data("\0", 1);/* TTY_OP_END, no special options */
2326 crWaitUntilV(ispkt
);
2327 if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2328 /* FIXME: be able to handle other channels here */
2329 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2330 continue; /* wrong channel */
2331 mainchan
->u
.v2
.remwindow
+= ssh2_pkt_getuint32();
2333 } while (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2335 if (pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
2336 if (pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
2337 bombout(("Server got confused by pty request"));
2340 c_write("Server refused to allocate pty\r\n", 32);
2342 logevent("Allocated pty");
2347 * Start a shell or a remote command.
2349 ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
2350 ssh2_pkt_adduint32(mainchan
->remoteid
); /* recipient channel */
2351 if (*cfg
.remote_cmd
) {
2352 ssh2_pkt_addstring("exec");
2353 ssh2_pkt_addbool(1); /* want reply */
2354 ssh2_pkt_addstring(cfg
.remote_cmd
);
2356 ssh2_pkt_addstring("shell");
2357 ssh2_pkt_addbool(1); /* want reply */
2361 crWaitUntilV(ispkt
);
2362 if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2363 /* FIXME: be able to handle other channels here */
2364 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2365 continue; /* wrong channel */
2366 mainchan
->u
.v2
.remwindow
+= ssh2_pkt_getuint32();
2368 } while (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2369 if (pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
2370 if (pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
2371 bombout(("Server got confused by shell/command request"));
2374 bombout(("Server refused to start a shell/command"));
2377 logevent("Started a shell/command");
2386 static int try_send
;
2390 if (pktin
.type
== SSH2_MSG_CHANNEL_DATA
||
2391 pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
) {
2394 /* FIXME: be able to handle other channels here */
2395 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2396 continue; /* wrong channel */
2397 if (pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
&&
2398 ssh2_pkt_getuint32() != SSH2_EXTENDED_DATA_STDERR
)
2399 continue; /* extended but not stderr */
2400 ssh2_pkt_getstring(&data
, &length
);
2402 c_writedata(data
, length
);
2404 * Enlarge the window again at the remote side,
2405 * just in case it ever runs down and they fail
2406 * to send us any more data.
2408 ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2409 ssh2_pkt_adduint32(mainchan
->remoteid
);
2410 ssh2_pkt_adduint32(length
);
2413 } else if (pktin
.type
== SSH2_MSG_DISCONNECT
) {
2414 ssh_state
= SSH_STATE_CLOSED
;
2415 logevent("Received disconnect message");
2416 } else if (pktin
.type
== SSH2_MSG_CHANNEL_REQUEST
) {
2417 continue; /* exit status et al; ignore (FIXME?) */
2418 } else if (pktin
.type
== SSH2_MSG_CHANNEL_EOF
) {
2419 continue; /* remote sends EOF; ignore */
2420 } else if (pktin
.type
== SSH2_MSG_CHANNEL_CLOSE
) {
2421 /* FIXME: be able to handle other channels here */
2422 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2423 continue; /* wrong channel */
2424 ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
2425 ssh2_pkt_adduint32(mainchan
->remoteid
);
2427 /* FIXME: mark the channel as closed */
2428 if (1 /* FIXME: "all channels are closed" */) {
2429 logevent("All channels closed. Disconnecting");
2430 ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
2433 continue; /* remote sends close; ignore (FIXME) */
2434 } else if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2435 /* FIXME: be able to handle other channels here */
2436 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2437 continue; /* wrong channel */
2438 mainchan
->u
.v2
.remwindow
+= ssh2_pkt_getuint32();
2441 bombout(("Strange packet received: type %d", pktin
.type
));
2446 * We have spare data. Add it to the channel buffer.
2448 if (mainchan
->u
.v2
.outbufsize
<
2449 mainchan
->u
.v2
.outbuflen
+ inlen
) {
2450 mainchan
->u
.v2
.outbufsize
=
2451 mainchan
->u
.v2
.outbuflen
+ inlen
+ 1024;
2452 mainchan
->u
.v2
.outbuffer
= srealloc(mainchan
->u
.v2
.outbuffer
,
2453 mainchan
->u
.v2
.outbufsize
);
2455 memcpy(mainchan
->u
.v2
.outbuffer
+ mainchan
->u
.v2
.outbuflen
,
2457 mainchan
->u
.v2
.outbuflen
+= inlen
;
2462 * Try to send data on the channel if we can. (FIXME:
2463 * on _all_ channels.)
2465 while (mainchan
->u
.v2
.remwindow
> 0 &&
2466 mainchan
->u
.v2
.outbuflen
> 0) {
2467 unsigned len
= mainchan
->u
.v2
.remwindow
;
2468 if (len
> mainchan
->u
.v2
.outbuflen
)
2469 len
= mainchan
->u
.v2
.outbuflen
;
2470 if (len
> mainchan
->u
.v2
.remmaxpkt
)
2471 len
= mainchan
->u
.v2
.remmaxpkt
;
2472 ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA
);
2473 ssh2_pkt_adduint32(mainchan
->remoteid
);
2474 ssh2_pkt_addstring_start();
2475 ssh2_pkt_addstring_data(mainchan
->u
.v2
.outbuffer
, len
);
2477 mainchan
->u
.v2
.outbuflen
-= len
;
2478 memmove(mainchan
->u
.v2
.outbuffer
, mainchan
->u
.v2
.outbuffer
+len
,
2479 mainchan
->u
.v2
.outbuflen
);
2480 mainchan
->u
.v2
.remwindow
-= len
;
2489 * Handle the top-level SSH2 protocol.
2491 static void ssh2_protocol(unsigned char *in
, int inlen
, int ispkt
)
2493 if (do_ssh2_transport(in
, inlen
, ispkt
) == 0)
2495 do_ssh2_authconn(in
, inlen
, ispkt
);
2499 * Called to set up the connection. Will arrange for WM_NETEVENT
2500 * messages to be passed to the specified window, whose window
2501 * procedure should then call telnet_msg().
2503 * Returns an error message, or NULL on success.
2505 static char *ssh_init (HWND hwnd
, char *host
, int port
, char **realhost
) {
2509 if(crypto_startup() == 0)
2510 return "Microsoft high encryption pack not installed!";
2513 p
= connect_to_host(host
, port
, realhost
);
2518 return "Protocol initialisation error";
2520 if (hwnd
&& WSAAsyncSelect (s
, hwnd
, WM_NETEVENT
, FD_READ
| FD_CLOSE
) == SOCKET_ERROR
)
2521 switch (WSAGetLastError()) {
2522 case WSAENETDOWN
: return "Network is down";
2523 default: return "WSAAsyncSelect(): unknown error";
2530 * Process a WM_NETEVENT message. Will return 0 if the connection
2531 * has closed, or <0 for a socket error.
2533 static int ssh_msg (WPARAM wParam
, LPARAM lParam
) {
2538 * Because reading less than the whole of the available pending
2539 * data can generate an FD_READ event, we need to allow for the
2540 * possibility that FD_READ may arrive with FD_CLOSE already in
2541 * the queue; so it's possible that we can get here even with s
2542 * invalid. If so, we return 1 and don't worry about it.
2544 if (s
== INVALID_SOCKET
)
2547 if (WSAGETSELECTERROR(lParam
) != 0) {
2550 return -WSAGETSELECTERROR(lParam
);
2553 switch (WSAGETSELECTEVENT(lParam
)) {
2556 ret
= recv(s
, buf
, sizeof(buf
), 0);
2557 if (ret
< 0 && WSAGetLastError() == WSAEWOULDBLOCK
)
2559 if (ret
< 0) { /* any _other_ error */
2562 return -10000-WSAGetLastError();
2568 ssh_gotdata (buf
, ret
);
2569 if (ssh_state
== SSH_STATE_CLOSED
) {
2576 return 1; /* shouldn't happen, but WTF */
2580 * Called to send data down the Telnet connection.
2582 static void ssh_send (char *buf
, int len
) {
2583 if (s
== INVALID_SOCKET
)
2586 ssh_protocol(buf
, len
, 0);
2590 * Called to set the size of the window from Telnet's POV.
2592 static void ssh_size(void) {
2593 switch (ssh_state
) {
2594 case SSH_STATE_BEFORE_SIZE
:
2595 case SSH_STATE_CLOSED
:
2596 break; /* do nothing */
2597 case SSH_STATE_INTERMED
:
2598 size_needed
= TRUE
; /* buffer for later */
2600 case SSH_STATE_SESSION
:
2602 send_packet(SSH1_CMSG_WINDOW_SIZE
,
2603 PKT_INT
, rows
, PKT_INT
, cols
,
2604 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
2610 * Send Telnet special codes. TS_EOF is useful for `plink', so you
2611 * can send an EOF and collect resulting output (e.g. `plink
2614 static void ssh_special (Telnet_Special code
) {
2615 if (code
== TS_EOF
) {
2616 if (ssh_version
== 1) {
2617 send_packet(SSH1_CMSG_EOF
, PKT_END
);
2619 ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF
);
2620 ssh2_pkt_adduint32(mainchan
->remoteid
);
2623 logevent("Sent EOF message");
2624 } else if (code
== TS_PING
) {
2625 if (ssh_version
== 1) {
2626 send_packet(SSH1_MSG_IGNORE
, PKT_STR
, "", PKT_END
);
2628 ssh2_pkt_init(SSH2_MSG_IGNORE
);
2629 ssh2_pkt_addstring_start();
2637 static SOCKET
ssh_socket(void) { return s
; }
2639 static int ssh_sendok(void) { return ssh_send_ok
; }
2641 Backend ssh_backend
= {