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
;
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
};
180 const static struct ssh_compress ssh_comp_none
= {
183 const static struct ssh_compress
*compressions
[] = { &ssh_comp_none
};
186 * 2-3-4 tree storing channels.
189 unsigned remoteid
, localid
;
193 struct ssh_agent_channel
{
194 unsigned char *message
;
195 unsigned char msglen
[4];
196 int lensofar
, totallen
;
198 struct ssh2_data_channel
{
199 unsigned char *outbuffer
;
200 unsigned outbuflen
, outbufsize
;
201 unsigned remwindow
, remmaxpkt
;
215 static SHA_State exhash
;
217 static SOCKET s
= INVALID_SOCKET
;
219 static unsigned char session_key
[32];
220 static const struct ssh_cipher
*cipher
= NULL
;
221 static const struct ssh_cipher
*cscipher
= NULL
;
222 static const struct ssh_cipher
*sccipher
= NULL
;
223 static const struct ssh_mac
*csmac
= NULL
;
224 static const struct ssh_mac
*scmac
= NULL
;
225 static const struct ssh_compress
*cscomp
= NULL
;
226 static const struct ssh_compress
*sccomp
= NULL
;
227 static const struct ssh_kex
*kex
= NULL
;
228 static const struct ssh_hostkey
*hostkey
= NULL
;
229 int (*ssh_get_password
)(const char *prompt
, char *str
, int maxlen
) = NULL
;
231 static char *savedhost
;
232 static int savedport
;
233 static int ssh_send_ok
;
235 static tree234
*ssh_channels
; /* indexed by local id */
236 static struct ssh_channel
*mainchan
; /* primary session channel */
239 SSH_STATE_BEFORE_SIZE
,
243 } ssh_state
= SSH_STATE_BEFORE_SIZE
;
245 static int size_needed
= FALSE
;
247 static struct Packet pktin
= { 0, 0, NULL
, NULL
, 0 };
248 static struct Packet pktout
= { 0, 0, NULL
, NULL
, 0 };
250 static int ssh_version
;
251 static void (*ssh_protocol
)(unsigned char *in
, int inlen
, int ispkt
);
252 static void ssh1_protocol(unsigned char *in
, int inlen
, int ispkt
);
253 static void ssh2_protocol(unsigned char *in
, int inlen
, int ispkt
);
254 static void ssh_size(void);
256 static int (*s_rdpkt
)(unsigned char **data
, int *datalen
);
258 static struct rdpkt1_state_tag
{
259 long len
, pad
, biglen
, to_read
;
260 unsigned long realcrc
, gotcrc
;
266 static struct rdpkt2_state_tag
{
267 long len
, pad
, payload
, packetlen
, maclen
;
270 unsigned long incoming_sequence
;
273 static int ssh_channelcmp(void *av
, void *bv
) {
274 struct ssh_channel
*a
= (struct ssh_channel
*)av
;
275 struct ssh_channel
*b
= (struct ssh_channel
*)bv
;
276 if (a
->localid
< b
->localid
) return -1;
277 if (a
->localid
> b
->localid
) return +1;
280 static int ssh_channelfind(void *av
, void *bv
) {
281 unsigned *a
= (unsigned *)av
;
282 struct ssh_channel
*b
= (struct ssh_channel
*)bv
;
283 if (*a
< b
->localid
) return -1;
284 if (*a
> b
->localid
) return +1;
288 static void s_write (char *buf
, int len
) {
290 int i
= send (s
, buf
, len
, 0);
293 bombout(("Lost connection while sending"));
301 static int s_read (char *buf
, int len
) {
304 int i
= recv (s
, buf
, len
, 0);
307 len
-= i
, buf
+= i
, ret
+= i
;
314 static void c_write (char *buf
, int len
) {
315 if ((flags
& FLAG_STDERR
)) {
317 for (i
= 0; i
< len
; i
++)
319 fputc(buf
[i
], stderr
);
326 static void c_writedata (char *buf
, int len
) {
332 * Collect incoming data in the incoming packet buffer.
333 * Decipher and verify the packet when it is completely read.
334 * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets.
335 * Update the *data and *datalen variables.
336 * Return the additional nr of bytes needed, or 0 when
337 * a complete packet is available.
339 static int ssh1_rdpkt(unsigned char **data
, int *datalen
)
341 struct rdpkt1_state_tag
*st
= &rdpkt1_state
;
350 for (st
->i
= st
->len
= 0; st
->i
< 4; st
->i
++) {
351 while ((*datalen
) == 0)
353 st
->len
= (st
->len
<< 8) + **data
;
354 (*data
)++, (*datalen
)--;
358 if (st
->len
== 0x52656d6f) { /* "Remo"te server has closed ... */
359 st
->len
= 0x300; /* big enough to carry to end */
363 st
->pad
= 8 - (st
->len
% 8);
364 st
->biglen
= st
->len
+ st
->pad
;
365 pktin
.length
= st
->len
- 5;
367 if (pktin
.maxlen
< st
->biglen
) {
368 pktin
.maxlen
= st
->biglen
;
369 pktin
.data
= (pktin
.data
== NULL ?
malloc(st
->biglen
+APIEXTRA
) :
370 realloc(pktin
.data
, st
->biglen
+APIEXTRA
));
372 fatalbox("Out of memory");
375 st
->to_read
= st
->biglen
;
377 while (st
->to_read
> 0) {
378 st
->chunk
= st
->to_read
;
379 while ((*datalen
) == 0)
380 crReturn(st
->to_read
);
381 if (st
->chunk
> (*datalen
))
382 st
->chunk
= (*datalen
);
383 memcpy(st
->p
, *data
, st
->chunk
);
385 *datalen
-= st
->chunk
;
387 st
->to_read
-= st
->chunk
;
391 cipher
->decrypt(pktin
.data
, st
->biglen
);
393 pktin
.type
= pktin
.data
[st
->pad
];
394 pktin
.body
= pktin
.data
+ st
->pad
+ 1;
396 st
->realcrc
= crc32(pktin
.data
, st
->biglen
-4);
397 st
->gotcrc
= GET_32BIT(pktin
.data
+st
->biglen
-4);
398 if (st
->gotcrc
!= st
->realcrc
) {
399 bombout(("Incorrect CRC received on packet"));
403 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
404 pktin
.type
== SSH1_SMSG_STDERR_DATA
||
405 pktin
.type
== SSH1_MSG_DEBUG
||
406 pktin
.type
== SSH1_SMSG_AUTH_TIS_CHALLENGE
||
407 pktin
.type
== SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
408 long strlen
= GET_32BIT(pktin
.body
);
409 if (strlen
+ 4 != pktin
.length
) {
410 bombout(("Received data packet with bogus string length"));
415 if (pktin
.type
== SSH1_MSG_DEBUG
) {
416 /* log debug message */
418 int strlen
= GET_32BIT(pktin
.body
);
419 strcpy(buf
, "Remote: ");
420 if (strlen
> 70) strlen
= 70;
421 memcpy(buf
+8, pktin
.body
+4, strlen
);
422 buf
[8+strlen
] = '\0';
425 } else if (pktin
.type
== SSH1_MSG_IGNORE
) {
433 static int ssh2_rdpkt(unsigned char **data
, int *datalen
)
435 struct rdpkt2_state_tag
*st
= &rdpkt2_state
;
443 st
->cipherblk
= sccipher
->blksize
;
446 if (st
->cipherblk
< 8)
449 if (pktin
.maxlen
< st
->cipherblk
) {
450 pktin
.maxlen
= st
->cipherblk
;
451 pktin
.data
= (pktin
.data
== NULL ?
malloc(st
->cipherblk
+APIEXTRA
) :
452 realloc(pktin
.data
, st
->cipherblk
+APIEXTRA
));
454 fatalbox("Out of memory");
458 * Acquire and decrypt the first block of the packet. This will
459 * contain the length and padding details.
461 for (st
->i
= st
->len
= 0; st
->i
< st
->cipherblk
; st
->i
++) {
462 while ((*datalen
) == 0)
463 crReturn(st
->cipherblk
-st
->i
);
464 pktin
.data
[st
->i
] = *(*data
)++;
468 if (!memcmp(pktin
.data
, "Remo", 4)) {/* "Remo"te server has closed ... */
473 sccipher
->decrypt(pktin
.data
, st
->cipherblk
);
476 * Now get the length and padding figures.
478 st
->len
= GET_32BIT(pktin
.data
);
479 st
->pad
= pktin
.data
[4];
482 * This enables us to deduce the payload length.
484 st
->payload
= st
->len
- st
->pad
- 1;
486 pktin
.length
= st
->payload
+ 5;
489 * So now we can work out the total packet length.
491 st
->packetlen
= st
->len
+ 4;
492 st
->maclen
= scmac ? scmac
->len
: 0;
495 * Adjust memory allocation if packet is too big.
497 if (pktin
.maxlen
< st
->packetlen
+st
->maclen
) {
498 pktin
.maxlen
= st
->packetlen
+st
->maclen
;
499 pktin
.data
= (pktin
.data
== NULL ?
malloc(pktin
.maxlen
+APIEXTRA
) :
500 realloc(pktin
.data
, pktin
.maxlen
+APIEXTRA
));
502 fatalbox("Out of memory");
506 * Read and decrypt the remainder of the packet.
508 for (st
->i
= st
->cipherblk
; st
->i
< st
->packetlen
+ st
->maclen
; st
->i
++) {
509 while ((*datalen
) == 0)
510 crReturn(st
->packetlen
+ st
->maclen
- st
->i
);
511 pktin
.data
[st
->i
] = *(*data
)++;
514 /* Decrypt everything _except_ the MAC. */
516 sccipher
->decrypt(pktin
.data
+ st
->cipherblk
,
517 st
->packetlen
- st
->cipherblk
);
520 debug(("Got packet len=%d pad=%d\r\n", st
->len
, st
->pad
));
521 for (st
->i
= 0; st
->i
< st
->packetlen
; st
->i
++)
522 debug((" %02x", (unsigned char)pktin
.data
[st
->i
]));
529 if (scmac
&& !scmac
->verify(pktin
.data
, st
->len
+4, st
->incoming_sequence
)) {
530 bombout(("Incorrect MAC received on packet"));
533 st
->incoming_sequence
++; /* whether or not we MACed */
536 pktin
.type
= pktin
.data
[5];
538 if (pktin
.type
== SSH2_MSG_IGNORE
|| pktin
.type
== SSH2_MSG_DEBUG
)
539 goto next_packet
; /* FIXME: print DEBUG message */
544 static void ssh_gotdata(unsigned char *data
, int datalen
)
546 while (datalen
> 0) {
547 if ( s_rdpkt(&data
, &datalen
) == 0 ) {
548 ssh_protocol(NULL
, 0, 1);
549 if (ssh_state
== SSH_STATE_CLOSED
) {
557 static void s_wrpkt_start(int type
, int len
) {
560 len
+= 5; /* type and CRC */
564 pktout
.length
= len
-5;
565 if (pktout
.maxlen
< biglen
) {
566 pktout
.maxlen
= biglen
;
568 /* Allocate enough buffer space for extra block
569 * for MS CryptEncrypt() */
570 pktout
.data
= (pktout
.data
== NULL ?
malloc(biglen
+12) :
571 realloc(pktout
.data
, biglen
+12));
573 pktout
.data
= (pktout
.data
== NULL ?
malloc(biglen
+4) :
574 realloc(pktout
.data
, biglen
+4));
577 fatalbox("Out of memory");
581 pktout
.body
= pktout
.data
+4+pad
+1;
584 static void s_wrpkt(void) {
585 int pad
, len
, biglen
, i
;
588 len
= pktout
.length
+ 5; /* type and CRC */
592 pktout
.body
[-1] = pktout
.type
;
593 for (i
=0; i
<pad
; i
++)
594 pktout
.data
[i
+4] = random_byte();
595 crc
= crc32(pktout
.data
+4, biglen
-4);
596 PUT_32BIT(pktout
.data
+biglen
, crc
);
597 PUT_32BIT(pktout
.data
, len
);
600 cipher
->encrypt(pktout
.data
+4, biglen
);
602 s_write(pktout
.data
, biglen
+4);
606 * Construct a packet with the specified contents and
607 * send it to the server.
609 static void send_packet(int pkttype
, ...)
612 unsigned char *p
, *argp
, argchar
;
613 unsigned long argint
;
614 int pktlen
, argtype
, arglen
;
618 va_start(args
, pkttype
);
619 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
622 (void) va_arg(args
, int);
626 (void) va_arg(args
, char);
630 (void) va_arg(args
, unsigned char *);
631 arglen
= va_arg(args
, int);
635 argp
= va_arg(args
, unsigned char *);
636 arglen
= strlen(argp
);
637 pktlen
+= 4 + arglen
;
640 bn
= va_arg(args
, Bignum
);
641 pktlen
+= ssh1_bignum_length(bn
);
649 s_wrpkt_start(pkttype
, pktlen
);
652 va_start(args
, pkttype
);
653 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
656 argint
= va_arg(args
, int);
657 PUT_32BIT(p
, argint
);
661 argchar
= va_arg(args
, unsigned char);
666 argp
= va_arg(args
, unsigned char *);
667 arglen
= va_arg(args
, int);
668 memcpy(p
, argp
, arglen
);
672 argp
= va_arg(args
, unsigned char *);
673 arglen
= strlen(argp
);
674 PUT_32BIT(p
, arglen
);
675 memcpy(p
+ 4, argp
, arglen
);
679 bn
= va_arg(args
, Bignum
);
680 p
+= ssh1_write_bignum(p
, bn
);
691 * Connect to specified host and port.
692 * Returns an error message, or NULL on success.
693 * Also places the canonical host name into `realhost'.
695 static char *connect_to_host(char *host
, int port
, char **realhost
)
705 savedhost
= malloc(1+strlen(host
));
707 fatalbox("Out of memory");
708 strcpy(savedhost
, host
);
711 port
= 22; /* default ssh port */
724 if ( (a
= inet_addr(host
)) == (unsigned long) INADDR_NONE
) {
725 if ( (h
= gethostbyname(host
)) == NULL
)
726 switch (WSAGetLastError()) {
727 case WSAENETDOWN
: return "Network is down";
728 case WSAHOST_NOT_FOUND
: case WSANO_DATA
:
729 return "Host does not exist";
730 case WSATRY_AGAIN
: return "Host not found";
731 default: return "gethostbyname: unknown error";
733 memcpy (&a
, h
->h_addr
, sizeof(a
));
734 *realhost
= h
->h_name
;
745 s
= socket(AF_INET
, SOCK_STREAM
, 0);
746 if (s
== INVALID_SOCKET
)
747 switch (WSAGetLastError()) {
748 case WSAENETDOWN
: return "Network is down";
749 case WSAEAFNOSUPPORT
: return "TCP/IP support not present";
750 default: return "socket(): unknown error";
754 * Bind to local address.
756 addr
.sin_family
= AF_INET
;
757 addr
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
758 addr
.sin_port
= htons(0);
759 if (bind (s
, (struct sockaddr
*)&addr
, sizeof(addr
)) == SOCKET_ERROR
)
760 switch (WSAGetLastError()) {
761 case WSAENETDOWN
: return "Network is down";
762 default: return "bind(): unknown error";
766 * Connect to remote address.
768 addr
.sin_addr
.s_addr
= htonl(a
);
769 addr
.sin_port
= htons((short)port
);
770 if (connect (s
, (struct sockaddr
*)&addr
, sizeof(addr
)) == SOCKET_ERROR
)
771 switch (WSAGetLastError()) {
772 case WSAENETDOWN
: return "Network is down";
773 case WSAECONNREFUSED
: return "Connection refused";
774 case WSAENETUNREACH
: return "Network is unreachable";
775 case WSAEHOSTUNREACH
: return "No route to host";
776 default: return "connect(): unknown error";
780 send(s
, "connect ", 8, 0);
781 send(s
, FWhost
, strlen(FWhost
), 0);
784 sprintf(buf
, " %d\n", FWport
);
785 send (s
, buf
, strlen(buf
), 0);
792 static int ssh_versioncmp(char *a
, char *b
) {
794 unsigned long av
, bv
;
796 av
= strtoul(a
, &ae
, 10);
797 bv
= strtoul(b
, &be
, 10);
798 if (av
!= bv
) return (av
< bv ?
-1 : +1);
799 if (*ae
== '.') ae
++;
800 if (*be
== '.') be
++;
801 av
= strtoul(ae
, &ae
, 10);
802 bv
= strtoul(be
, &be
, 10);
803 if (av
!= bv
) return (av
< bv ?
-1 : +1);
809 * Utility routine for putting an SSH-protocol `string' into a SHA
813 static void sha_string(SHA_State
*s
, void *str
, int len
) {
814 unsigned char lenblk
[4];
815 PUT_32BIT(lenblk
, len
);
816 SHA_Bytes(s
, lenblk
, 4);
817 SHA_Bytes(s
, str
, len
);
821 * SSH2 packet construction functions.
823 static void ssh2_pkt_adddata(void *data
, int len
) {
824 pktout
.length
+= len
;
825 if (pktout
.maxlen
< pktout
.length
) {
826 pktout
.maxlen
= pktout
.length
+ 256;
827 pktout
.data
= (pktout
.data
== NULL ?
malloc(pktout
.maxlen
+APIEXTRA
) :
828 realloc(pktout
.data
, pktout
.maxlen
+APIEXTRA
));
830 fatalbox("Out of memory");
832 memcpy(pktout
.data
+pktout
.length
-len
, data
, len
);
834 static void ssh2_pkt_addbyte(unsigned char byte
) {
835 ssh2_pkt_adddata(&byte
, 1);
837 static void ssh2_pkt_init(int pkt_type
) {
839 ssh2_pkt_addbyte((unsigned char)pkt_type
);
841 static void ssh2_pkt_addbool(unsigned char value
) {
842 ssh2_pkt_adddata(&value
, 1);
844 static void ssh2_pkt_adduint32(unsigned long value
) {
847 ssh2_pkt_adddata(x
, 4);
849 static void ssh2_pkt_addstring_start(void) {
850 ssh2_pkt_adduint32(0);
851 pktout
.savedpos
= pktout
.length
;
853 static void ssh2_pkt_addstring_str(char *data
) {
854 ssh2_pkt_adddata(data
, strlen(data
));
855 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
856 pktout
.length
- pktout
.savedpos
);
858 static void ssh2_pkt_addstring_data(char *data
, int len
) {
859 ssh2_pkt_adddata(data
, len
);
860 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
861 pktout
.length
- pktout
.savedpos
);
863 static void ssh2_pkt_addstring(char *data
) {
864 ssh2_pkt_addstring_start();
865 ssh2_pkt_addstring_str(data
);
867 static char *ssh2_mpint_fmt(Bignum b
, int *len
) {
870 p
= malloc(n
* 2 + 1);
872 fatalbox("out of memory");
874 for (i
= 0; i
< n
; i
++) {
875 p
[i
*2+1] = (b
[n
-i
] >> 8) & 0xFF;
876 p
[i
*2+2] = (b
[n
-i
] ) & 0xFF;
879 while (p
[i
] == 0 && (p
[i
+1] & 0x80) == 0)
881 memmove(p
, p
+i
, n
*2+1-i
);
885 static void ssh2_pkt_addmp(Bignum b
) {
888 p
= ssh2_mpint_fmt(b
, &len
);
889 ssh2_pkt_addstring_start();
890 ssh2_pkt_addstring_data(p
, len
);
893 static void ssh2_pkt_send(void) {
894 int cipherblk
, maclen
, padding
, i
;
895 static unsigned long outgoing_sequence
= 0;
898 * Add padding. At least four bytes, and must also bring total
899 * length (minus MAC) up to a multiple of the block size.
901 cipherblk
= cipher ? cipher
->blksize
: 8; /* block size */
902 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
904 padding
+= (cipherblk
- (pktout
.length
+ padding
) % cipherblk
) % cipherblk
;
905 pktout
.data
[4] = padding
;
906 for (i
= 0; i
< padding
; i
++)
907 pktout
.data
[pktout
.length
+ i
] = random_byte();
908 PUT_32BIT(pktout
.data
, pktout
.length
+ padding
- 4);
910 csmac
->generate(pktout
.data
, pktout
.length
+ padding
,
912 outgoing_sequence
++; /* whether or not we MACed */
915 debug(("Sending packet len=%d\r\n", pktout
.length
+padding
));
916 for (i
= 0; i
< pktout
.length
+padding
; i
++)
917 debug((" %02x", (unsigned char)pktout
.data
[i
]));
922 cscipher
->encrypt(pktout
.data
, pktout
.length
+ padding
);
923 maclen
= csmac ? csmac
->len
: 0;
925 s_write(pktout
.data
, pktout
.length
+ padding
+ maclen
);
929 void bndebug(char *string
, Bignum b
) {
932 p
= ssh2_mpint_fmt(b
, &len
);
933 debug(("%s", string
));
934 for (i
= 0; i
< len
; i
++)
935 debug((" %02x", p
[i
]));
941 static void sha_mpint(SHA_State
*s
, Bignum b
) {
944 p
= ssh2_mpint_fmt(b
, &len
);
945 sha_string(s
, p
, len
);
950 * SSH2 packet decode functions.
952 static unsigned long ssh2_pkt_getuint32(void) {
954 if (pktin
.length
- pktin
.savedpos
< 4)
955 return 0; /* arrgh, no way to decline (FIXME?) */
956 value
= GET_32BIT(pktin
.data
+pktin
.savedpos
);
960 static void ssh2_pkt_getstring(char **p
, int *length
) {
962 if (pktin
.length
- pktin
.savedpos
< 4)
964 *length
= GET_32BIT(pktin
.data
+pktin
.savedpos
);
966 if (pktin
.length
- pktin
.savedpos
< *length
)
968 *p
= pktin
.data
+pktin
.savedpos
;
969 pktin
.savedpos
+= *length
;
971 static Bignum
ssh2_pkt_getmp(void) {
976 ssh2_pkt_getstring(&p
, &length
);
980 bombout(("internal error: Can't handle negative mpints"));
983 b
= newbn((length
+1)/2);
984 for (i
= 0; i
< length
; i
++) {
987 b
[j
/2+1] |= ((unsigned char)p
[i
]) << 8;
989 b
[j
/2+1] |= ((unsigned char)p
[i
]);
994 static int do_ssh_init(void) {
998 char vlog
[sizeof(vstring
)+20];
1003 while (s_read(&c
, 1) == 1) {
1004 if (c
== 'S' && i
< 2) i
++;
1005 else if (c
== 'S' && i
== 2) i
= 2;
1006 else if (c
== 'H' && i
== 2) break;
1010 if (s_read(&c
,1) != 1 || c
!= 'S') return 0;
1011 if (s_read(&c
,1) != 1 || c
!= 'S') return 0;
1012 if (s_read(&c
,1) != 1 || c
!= 'H') return 0;
1014 strcpy(vstring
, "SSH-");
1016 if (s_read(&c
,1) != 1 || c
!= '-') return 0;
1019 if (s_read(&c
,1) != 1)
1021 if (vsp
< vstring
+sizeof(vstring
)-1)
1027 } else if (i
< sizeof(version
)-1)
1034 rdpkt2_state
.incoming_sequence
= 0;
1037 sprintf(vlog
, "Server version: %s", vstring
);
1038 vlog
[strcspn(vlog
, "\r\n")] = '\0';
1042 * Server version "1.99" means we can choose whether we use v1
1043 * or v2 protocol. Choice is based on cfg.sshprot.
1045 if (ssh_versioncmp(version
, cfg
.sshprot
== 1 ?
"2.0" : "1.99") >= 0) {
1047 * This is a v2 server. Begin v2 protocol.
1049 char *verstring
= "SSH-2.0-PuTTY";
1052 * Hash our version string and their version string.
1054 sha_string(&exhash
, verstring
, strlen(verstring
));
1055 sha_string(&exhash
, vstring
, strcspn(vstring
, "\r\n"));
1056 sprintf(vstring
, "%s\n", verstring
);
1057 sprintf(vlog
, "We claim version: %s", verstring
);
1059 logevent("Using SSH protocol version 2");
1060 s_write(vstring
, strlen(vstring
));
1061 ssh_protocol
= ssh2_protocol
;
1063 s_rdpkt
= ssh2_rdpkt
;
1066 * This is a v1 server. Begin v1 protocol.
1068 sprintf(vstring
, "SSH-%s-PuTTY\n",
1069 (ssh_versioncmp(version
, "1.5") <= 0 ? version
: "1.5"));
1070 sprintf(vlog
, "We claim version: %s", vstring
);
1071 vlog
[strcspn(vlog
, "\r\n")] = '\0';
1073 logevent("Using SSH protocol version 1");
1074 s_write(vstring
, strlen(vstring
));
1075 ssh_protocol
= ssh1_protocol
;
1077 s_rdpkt
= ssh1_rdpkt
;
1084 * Handle the key exchange and user authentication phases.
1086 static int do_ssh1_login(unsigned char *in
, int inlen
, int ispkt
)
1089 unsigned char *rsabuf
, *keystr1
, *keystr2
;
1090 unsigned char cookie
[8];
1091 struct RSAKey servkey
, hostkey
;
1092 struct MD5Context md5c
;
1093 static unsigned long supported_ciphers_mask
, supported_auths_mask
;
1094 static int tried_publickey
;
1095 static unsigned char session_id
[16];
1097 static char username
[100];
1101 if (!ispkt
) crWaitUntil(ispkt
);
1103 if (pktin
.type
!= SSH1_SMSG_PUBLIC_KEY
) {
1104 bombout(("Public key packet not received"));
1108 logevent("Received public keys");
1110 memcpy(cookie
, pktin
.body
, 8);
1112 i
= makekey(pktin
.body
+8, &servkey
, &keystr1
, 0);
1113 j
= makekey(pktin
.body
+8+i
, &hostkey
, &keystr2
, 0);
1116 * Log the host key fingerprint.
1120 logevent("Host key fingerprint is:");
1121 strcpy(logmsg
, " ");
1122 hostkey
.comment
= NULL
;
1123 rsa_fingerprint(logmsg
+strlen(logmsg
), sizeof(logmsg
)-strlen(logmsg
),
1128 supported_ciphers_mask
= GET_32BIT(pktin
.body
+12+i
+j
);
1129 supported_auths_mask
= GET_32BIT(pktin
.body
+16+i
+j
);
1132 MD5Update(&md5c
, keystr2
, hostkey
.bytes
);
1133 MD5Update(&md5c
, keystr1
, servkey
.bytes
);
1134 MD5Update(&md5c
, pktin
.body
, 8);
1135 MD5Final(session_id
, &md5c
);
1137 for (i
=0; i
<32; i
++)
1138 session_key
[i
] = random_byte();
1140 len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
1142 rsabuf
= malloc(len
);
1144 fatalbox("Out of memory");
1147 * Verify the host key.
1151 * First format the key into a string.
1153 int len
= rsastr_len(&hostkey
);
1154 char fingerprint
[100];
1155 char *keystr
= malloc(len
);
1157 fatalbox("Out of memory");
1158 rsastr_fmt(keystr
, &hostkey
);
1159 rsa_fingerprint(fingerprint
, sizeof(fingerprint
), &hostkey
);
1160 verify_ssh_host_key(savedhost
, savedport
, "rsa", keystr
, fingerprint
);
1164 for (i
=0; i
<32; i
++) {
1165 rsabuf
[i
] = session_key
[i
];
1167 rsabuf
[i
] ^= session_id
[i
];
1170 if (hostkey
.bytes
> servkey
.bytes
) {
1171 rsaencrypt(rsabuf
, 32, &servkey
);
1172 rsaencrypt(rsabuf
, servkey
.bytes
, &hostkey
);
1174 rsaencrypt(rsabuf
, 32, &hostkey
);
1175 rsaencrypt(rsabuf
, hostkey
.bytes
, &servkey
);
1178 logevent("Encrypted session key");
1180 cipher_type
= cfg
.cipher
== CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH
:
1181 cfg
.cipher
== CIPHER_DES ? SSH_CIPHER_DES
:
1183 if ((supported_ciphers_mask
& (1 << cipher_type
)) == 0) {
1184 c_write("Selected cipher not supported, falling back to 3DES\r\n", 53);
1185 cipher_type
= SSH_CIPHER_3DES
;
1187 switch (cipher_type
) {
1188 case SSH_CIPHER_3DES
: logevent("Using 3DES encryption"); break;
1189 case SSH_CIPHER_DES
: logevent("Using single-DES encryption"); break;
1190 case SSH_CIPHER_BLOWFISH
: logevent("Using Blowfish encryption"); break;
1193 send_packet(SSH1_CMSG_SESSION_KEY
,
1194 PKT_CHAR
, cipher_type
,
1195 PKT_DATA
, cookie
, 8,
1196 PKT_CHAR
, (len
*8) >> 8, PKT_CHAR
, (len
*8) & 0xFF,
1197 PKT_DATA
, rsabuf
, len
,
1201 logevent("Trying to enable encryption...");
1205 cipher
= cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish_ssh1
:
1206 cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
1208 cipher
->sesskey(session_key
);
1212 if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1213 bombout(("Encryption not successfully enabled"));
1217 logevent("Successfully started encryption");
1223 if ((flags
& FLAG_INTERACTIVE
) && !*cfg
.username
) {
1224 c_write("login as: ", 10);
1227 crWaitUntil(!ispkt
);
1228 while (inlen
--) switch (c
= *in
++) {
1235 c_write("\b \b", 3);
1241 c_write("\b \b", 3);
1250 if (((c
>= ' ' && c
<= '~') ||
1251 ((unsigned char)c
>= 160)) && pos
< 40) {
1252 username
[pos
++] = c
;
1259 username
[strcspn(username
, "\n\r")] = '\0';
1262 strncpy(username
, cfg
.username
, 99);
1263 username
[99] = '\0';
1264 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
1265 sprintf(stuff
, "Sent username \"%s\".\r\n", username
);
1266 c_write(stuff
, strlen(stuff
));
1270 send_packet(SSH1_CMSG_USER
, PKT_STR
, username
, PKT_END
);
1272 char userlog
[20+sizeof(username
)];
1273 sprintf(userlog
, "Sent username \"%s\"", username
);
1280 tried_publickey
= 0;
1282 while (pktin
.type
== SSH1_SMSG_FAILURE
) {
1283 static char password
[100];
1284 static char prompt
[200];
1287 static int pwpkt_type
;
1289 * Show password prompt, having first obtained it via a TIS
1290 * or CryptoCard exchange if we're doing TIS or CryptoCard
1293 pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
1294 if (agent_exists()) {
1296 * Attempt RSA authentication using Pageant.
1298 static unsigned char request
[5], *response
, *p
;
1299 static int responselen
;
1300 static int i
, nkeys
;
1301 static int authed
= FALSE
;
1304 logevent("Pageant is running. Requesting keys.");
1306 /* Request the keys held by the agent. */
1307 PUT_32BIT(request
, 1);
1308 request
[4] = SSH_AGENTC_REQUEST_RSA_IDENTITIES
;
1309 agent_query(request
, 5, &r
, &responselen
);
1310 response
= (unsigned char *)r
;
1313 nkeys
= GET_32BIT(p
); p
+= 4;
1314 { char buf
[64]; sprintf(buf
, "Pageant has %d keys", nkeys
);
1316 for (i
= 0; i
< nkeys
; i
++) {
1317 static struct RSAKey key
;
1318 static Bignum challenge
;
1319 static char *commentp
;
1320 static int commentlen
;
1322 { char buf
[64]; sprintf(buf
, "Trying Pageant key #%d", i
);
1325 p
+= ssh1_read_bignum(p
, &key
.exponent
);
1326 p
+= ssh1_read_bignum(p
, &key
.modulus
);
1327 commentlen
= GET_32BIT(p
); p
+= 4;
1328 commentp
= p
; p
+= commentlen
;
1329 send_packet(SSH1_CMSG_AUTH_RSA
,
1330 PKT_BIGNUM
, key
.modulus
, PKT_END
);
1332 if (pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
1333 logevent("Key refused");
1336 logevent("Received RSA challenge");
1337 ssh1_read_bignum(pktin
.body
, &challenge
);
1339 char *agentreq
, *q
, *ret
;
1341 len
= 1 + 4; /* message type, bit count */
1342 len
+= ssh1_bignum_length(key
.exponent
);
1343 len
+= ssh1_bignum_length(key
.modulus
);
1344 len
+= ssh1_bignum_length(challenge
);
1345 len
+= 16; /* session id */
1346 len
+= 4; /* response format */
1347 agentreq
= malloc(4 + len
);
1348 PUT_32BIT(agentreq
, len
);
1350 *q
++ = SSH_AGENTC_RSA_CHALLENGE
;
1351 PUT_32BIT(q
, ssh1_bignum_bitcount(key
.modulus
));
1353 q
+= ssh1_write_bignum(q
, key
.exponent
);
1354 q
+= ssh1_write_bignum(q
, key
.modulus
);
1355 q
+= ssh1_write_bignum(q
, challenge
);
1356 memcpy(q
, session_id
, 16); q
+= 16;
1357 PUT_32BIT(q
, 1); /* response format */
1358 agent_query(agentreq
, len
+4, &ret
, &retlen
);
1361 if (ret
[4] == SSH_AGENT_RSA_RESPONSE
) {
1362 logevent("Sending Pageant's response");
1363 send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE
,
1364 PKT_DATA
, ret
+5, 16, PKT_END
);
1367 if (pktin
.type
== SSH1_SMSG_SUCCESS
) {
1368 logevent("Pageant's response accepted");
1369 if (flags
& FLAG_VERBOSE
) {
1370 c_write("Authenticated using RSA key \"",
1372 c_write(commentp
, commentlen
);
1373 c_write("\" from agent\r\n", 14);
1377 logevent("Pageant's response not accepted");
1379 logevent("Pageant failed to answer challenge");
1383 logevent("No reply received from Pageant");
1386 freebn(key
.exponent
);
1387 freebn(key
.modulus
);
1396 if (*cfg
.keyfile
&& !tried_publickey
)
1397 pwpkt_type
= SSH1_CMSG_AUTH_RSA
;
1399 if (pktin
.type
== SSH1_SMSG_FAILURE
&&
1401 (supported_auths_mask
& (1<<SSH1_AUTH_TIS
))) {
1402 pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
1403 logevent("Requested TIS authentication");
1404 send_packet(SSH1_CMSG_AUTH_TIS
, PKT_END
);
1406 if (pktin
.type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
1407 logevent("TIS authentication declined");
1408 if (flags
& FLAG_INTERACTIVE
)
1409 c_write("TIS authentication refused.\r\n", 29);
1411 int challengelen
= ((pktin
.body
[0] << 24) |
1412 (pktin
.body
[1] << 16) |
1413 (pktin
.body
[2] << 8) |
1415 logevent("Received TIS challenge");
1416 if (challengelen
> sizeof(prompt
)-1)
1417 challengelen
= sizeof(prompt
)-1; /* prevent overrun */
1418 memcpy(prompt
, pktin
.body
+4, challengelen
);
1419 prompt
[challengelen
] = '\0';
1422 if (pktin
.type
== SSH1_SMSG_FAILURE
&&
1424 (supported_auths_mask
& (1<<SSH1_AUTH_CCARD
))) {
1425 pwpkt_type
= SSH1_CMSG_AUTH_CCARD_RESPONSE
;
1426 logevent("Requested CryptoCard authentication");
1427 send_packet(SSH1_CMSG_AUTH_CCARD
, PKT_END
);
1429 if (pktin
.type
!= SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
1430 logevent("CryptoCard authentication declined");
1431 c_write("CryptoCard authentication refused.\r\n", 29);
1433 int challengelen
= ((pktin
.body
[0] << 24) |
1434 (pktin
.body
[1] << 16) |
1435 (pktin
.body
[2] << 8) |
1437 logevent("Received CryptoCard challenge");
1438 if (challengelen
> sizeof(prompt
)-1)
1439 challengelen
= sizeof(prompt
)-1; /* prevent overrun */
1440 memcpy(prompt
, pktin
.body
+4, challengelen
);
1441 strncpy(prompt
+ challengelen
, "\r\nResponse : ",
1442 sizeof(prompt
)-challengelen
);
1443 prompt
[sizeof(prompt
)-1] = '\0';
1446 if (pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
1447 sprintf(prompt
, "%.90s@%.90s's password: ",
1448 username
, savedhost
);
1450 if (pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
1451 char *comment
= NULL
;
1452 if (flags
& FLAG_VERBOSE
)
1453 c_write("Trying public key authentication.\r\n", 35);
1454 if (!rsakey_encrypted(cfg
.keyfile
, &comment
)) {
1455 if (flags
& FLAG_VERBOSE
)
1456 c_write("No passphrase required.\r\n", 25);
1459 sprintf(prompt
, "Passphrase for key \"%.100s\": ", comment
);
1463 if (ssh_get_password
) {
1464 if (!ssh_get_password(prompt
, password
, sizeof(password
))) {
1466 * get_password failed to get a password (for
1467 * example because one was supplied on the command
1468 * line which has already failed to work).
1471 logevent("No more passwords to try");
1472 ssh_state
= SSH_STATE_CLOSED
;
1476 c_write(prompt
, strlen(prompt
));
1480 crWaitUntil(!ispkt
);
1481 while (inlen
--) switch (c
= *in
++) {
1498 if (((c
>= ' ' && c
<= '~') ||
1499 ((unsigned char)c
>= 160)) && pos
< sizeof(password
))
1500 password
[pos
++] = c
;
1508 if (pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
1510 * Try public key authentication with the specified
1513 static struct RSAKey pubkey
;
1514 static Bignum challenge
, response
;
1516 static unsigned char buffer
[32];
1518 tried_publickey
= 1;
1519 i
= loadrsakey(cfg
.keyfile
, &pubkey
, password
);
1521 c_write("Couldn't load public key from ", 30);
1522 c_write(cfg
.keyfile
, strlen(cfg
.keyfile
));
1523 c_write(".\r\n", 3);
1524 continue; /* go and try password */
1527 c_write("Wrong passphrase.\r\n", 19);
1528 tried_publickey
= 0;
1529 continue; /* try again */
1533 * Send a public key attempt.
1535 send_packet(SSH1_CMSG_AUTH_RSA
,
1536 PKT_BIGNUM
, pubkey
.modulus
, PKT_END
);
1539 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1540 c_write("Server refused our public key.\r\n", 32);
1541 continue; /* go and try password */
1543 if (pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
1544 bombout(("Bizarre response to offer of public key"));
1547 ssh1_read_bignum(pktin
.body
, &challenge
);
1548 response
= rsadecrypt(challenge
, &pubkey
);
1549 freebn(pubkey
.private_exponent
); /* burn the evidence */
1551 for (i
= 0; i
< 32; i
+= 2) {
1552 buffer
[i
] = response
[16-i
/2] >> 8;
1553 buffer
[i
+1] = response
[16-i
/2] & 0xFF;
1557 MD5Update(&md5c
, buffer
, 32);
1558 MD5Update(&md5c
, session_id
, 16);
1559 MD5Final(buffer
, &md5c
);
1561 send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE
,
1562 PKT_DATA
, buffer
, 16, PKT_END
);
1565 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1566 if (flags
& FLAG_VERBOSE
)
1567 c_write("Failed to authenticate with our public key.\r\n",
1569 continue; /* go and try password */
1570 } else if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1571 bombout(("Bizarre response to RSA authentication response"));
1575 break; /* we're through! */
1577 send_packet(pwpkt_type
, PKT_STR
, password
, PKT_END
);
1579 logevent("Sent password");
1580 memset(password
, 0, strlen(password
));
1582 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1583 if (flags
& FLAG_VERBOSE
)
1584 c_write("Access denied\r\n", 15);
1585 logevent("Authentication refused");
1586 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1587 logevent("Received disconnect request");
1588 ssh_state
= SSH_STATE_CLOSED
;
1590 } else if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1591 bombout(("Strange packet received, type %d", pktin
.type
));
1596 logevent("Authentication successful");
1601 static void ssh1_protocol(unsigned char *in
, int inlen
, int ispkt
) {
1606 while (!do_ssh1_login(in
, inlen
, ispkt
)) {
1609 if (ssh_state
== SSH_STATE_CLOSED
)
1612 if (cfg
.agentfwd
&& agent_exists()) {
1613 logevent("Requesting agent forwarding");
1614 send_packet(SSH1_CMSG_AGENT_REQUEST_FORWARDING
, PKT_END
);
1615 do { crReturnV
; } while (!ispkt
);
1616 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1617 bombout(("Protocol confusion"));
1619 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1620 logevent("Agent forwarding refused");
1622 logevent("Agent forwarding enabled");
1626 send_packet(SSH1_CMSG_REQUEST_PTY
,
1627 PKT_STR
, cfg
.termtype
,
1628 PKT_INT
, rows
, PKT_INT
, cols
,
1629 PKT_INT
, 0, PKT_INT
, 0,
1632 ssh_state
= SSH_STATE_INTERMED
;
1633 do { crReturnV
; } while (!ispkt
);
1634 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1635 bombout(("Protocol confusion"));
1637 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1638 c_write("Server refused to allocate pty\r\n", 32);
1640 logevent("Allocated pty");
1643 if (*cfg
.remote_cmd
)
1644 send_packet(SSH1_CMSG_EXEC_CMD
, PKT_STR
, cfg
.remote_cmd
, PKT_END
);
1646 send_packet(SSH1_CMSG_EXEC_SHELL
, PKT_END
);
1647 logevent("Started session");
1649 ssh_state
= SSH_STATE_SESSION
;
1654 ssh_channels
= newtree234(ssh_channelcmp
);
1659 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
1660 pktin
.type
== SSH1_SMSG_STDERR_DATA
) {
1661 long len
= GET_32BIT(pktin
.body
);
1662 c_writedata(pktin
.body
+4, len
);
1663 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1664 ssh_state
= SSH_STATE_CLOSED
;
1665 logevent("Received disconnect request");
1666 } else if (pktin
.type
== SSH1_SMSG_AGENT_OPEN
) {
1667 /* Remote side is trying to open a channel to talk to our
1668 * agent. Give them back a local channel number. */
1670 struct ssh_channel
*c
;
1672 for (c
= first234(ssh_channels
, &e
); c
; c
= next234(&e
)) {
1674 break; /* found a free number */
1677 c
= malloc(sizeof(struct ssh_channel
));
1678 c
->remoteid
= GET_32BIT(pktin
.body
);
1681 c
->type
= SSH1_SMSG_AGENT_OPEN
; /* identify channel type */
1682 c
->u
.a
.lensofar
= 0;
1683 add234(ssh_channels
, c
);
1684 send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
1685 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
1687 } else if (pktin
.type
== SSH1_MSG_CHANNEL_CLOSE
||
1688 pktin
.type
== SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
) {
1689 /* Remote side closes a channel. */
1690 unsigned i
= GET_32BIT(pktin
.body
);
1691 struct ssh_channel
*c
;
1692 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
1695 closetype
= (pktin
.type
== SSH1_MSG_CHANNEL_CLOSE ?
1 : 2);
1696 send_packet(pktin
.type
, PKT_INT
, c
->remoteid
, PKT_END
);
1697 c
->closes
|= closetype
;
1698 if (c
->closes
== 3) {
1699 del234(ssh_channels
, c
);
1703 } else if (pktin
.type
== SSH1_MSG_CHANNEL_DATA
) {
1704 /* Data sent down one of our channels. */
1705 int i
= GET_32BIT(pktin
.body
);
1706 int len
= GET_32BIT(pktin
.body
+4);
1707 unsigned char *p
= pktin
.body
+8;
1708 struct ssh_channel
*c
;
1709 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
1712 case SSH1_SMSG_AGENT_OPEN
:
1713 /* Data for an agent message. Buffer it. */
1715 if (c
->u
.a
.lensofar
< 4) {
1716 int l
= min(4 - c
->u
.a
.lensofar
, len
);
1717 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
, p
, l
);
1718 p
+= l
; len
-= l
; c
->u
.a
.lensofar
+= l
;
1720 if (c
->u
.a
.lensofar
== 4) {
1721 c
->u
.a
.totallen
= 4 + GET_32BIT(c
->u
.a
.msglen
);
1722 c
->u
.a
.message
= malloc(c
->u
.a
.totallen
);
1723 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
1725 if (c
->u
.a
.lensofar
>= 4 && len
> 0) {
1726 int l
= min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
, len
);
1727 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
, p
, l
);
1728 p
+= l
; len
-= l
; c
->u
.a
.lensofar
+= l
;
1730 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
1731 void *reply
, *sentreply
;
1733 agent_query(c
->u
.a
.message
, c
->u
.a
.totallen
,
1738 /* Fake SSH_AGENT_FAILURE. */
1739 sentreply
= "\0\0\0\1\5";
1742 send_packet(SSH1_MSG_CHANNEL_DATA
,
1743 PKT_INT
, c
->remoteid
,
1745 PKT_DATA
, sentreply
, replylen
,
1749 free(c
->u
.a
.message
);
1750 c
->u
.a
.lensofar
= 0;
1756 } else if (pktin
.type
== SSH1_SMSG_SUCCESS
) {
1757 /* may be from EXEC_SHELL on some servers */
1758 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1759 /* may be from EXEC_SHELL on some servers
1760 * if no pty is available or in other odd cases. Ignore */
1761 } else if (pktin
.type
== SSH1_SMSG_EXIT_STATUS
) {
1762 send_packet(SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
1764 bombout(("Strange packet received: type %d", pktin
.type
));
1768 send_packet(SSH1_CMSG_STDIN_DATA
,
1769 PKT_INT
, inlen
, PKT_DATA
, in
, inlen
, PKT_END
);
1777 * Utility routine for decoding comma-separated strings in KEXINIT.
1779 static int in_commasep_string(char *needle
, char *haystack
, int haylen
) {
1780 int needlen
= strlen(needle
);
1783 * Is it at the start of the string?
1785 if (haylen
>= needlen
&& /* haystack is long enough */
1786 !memcmp(needle
, haystack
, needlen
) && /* initial match */
1787 (haylen
== needlen
|| haystack
[needlen
] == ',')
1788 /* either , or EOS follows */
1792 * If not, search for the next comma and resume after that.
1793 * If no comma found, terminate.
1795 while (haylen
> 0 && *haystack
!= ',')
1796 haylen
--, haystack
++;
1799 haylen
--, haystack
++; /* skip over comma itself */
1804 * SSH2 key creation method.
1806 static void ssh2_mkkey(Bignum K
, char *H
, char chr
, char *keyspace
) {
1808 /* First 20 bytes. */
1811 SHA_Bytes(&s
, H
, 20);
1812 SHA_Bytes(&s
, &chr
, 1);
1813 SHA_Bytes(&s
, H
, 20);
1814 SHA_Final(&s
, keyspace
);
1815 /* Next 20 bytes. */
1818 SHA_Bytes(&s
, H
, 20);
1819 SHA_Bytes(&s
, keyspace
, 20);
1820 SHA_Final(&s
, keyspace
+20);
1824 * Handle the SSH2 transport layer.
1826 static int do_ssh2_transport(unsigned char *in
, int inlen
, int ispkt
)
1830 static Bignum e
, f
, K
;
1831 static const struct ssh_cipher
*cscipher_tobe
= NULL
;
1832 static const struct ssh_cipher
*sccipher_tobe
= NULL
;
1833 static const struct ssh_mac
*csmac_tobe
= NULL
;
1834 static const struct ssh_mac
*scmac_tobe
= NULL
;
1835 static const struct ssh_compress
*cscomp_tobe
= NULL
;
1836 static const struct ssh_compress
*sccomp_tobe
= NULL
;
1837 static char *hostkeydata
, *sigdata
, *keystr
, *fingerprint
;
1838 static int hostkeylen
, siglen
;
1839 static unsigned char exchange_hash
[20];
1840 static unsigned char keyspace
[40];
1841 static const struct ssh_cipher
*preferred_cipher
;
1847 * Set up the preferred cipher.
1849 if (cfg
.cipher
== CIPHER_BLOWFISH
) {
1850 preferred_cipher
= &ssh_blowfish_ssh2
;
1851 } else if (cfg
.cipher
== CIPHER_DES
) {
1852 logevent("Single DES not supported in SSH2; using 3DES");
1853 preferred_cipher
= &ssh_3des_ssh2
;
1854 } else if (cfg
.cipher
== CIPHER_3DES
) {
1855 preferred_cipher
= &ssh_3des_ssh2
;
1857 /* Shouldn't happen, but we do want to initialise to _something_. */
1858 preferred_cipher
= &ssh_3des_ssh2
;
1863 * Construct and send our key exchange packet.
1865 ssh2_pkt_init(SSH2_MSG_KEXINIT
);
1866 for (i
= 0; i
< 16; i
++)
1867 ssh2_pkt_addbyte((unsigned char)random_byte());
1868 /* List key exchange algorithms. */
1869 ssh2_pkt_addstring_start();
1870 for (i
= 0; i
< lenof(kex_algs
); i
++) {
1871 ssh2_pkt_addstring_str(kex_algs
[i
]->name
);
1872 if (i
< lenof(kex_algs
)-1)
1873 ssh2_pkt_addstring_str(",");
1875 /* List server host key algorithms. */
1876 ssh2_pkt_addstring_start();
1877 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
1878 ssh2_pkt_addstring_str(hostkey_algs
[i
]->name
);
1879 if (i
< lenof(hostkey_algs
)-1)
1880 ssh2_pkt_addstring_str(",");
1882 /* List client->server encryption algorithms. */
1883 ssh2_pkt_addstring_start();
1884 for (i
= 0; i
< lenof(ciphers
)+1; i
++) {
1885 const struct ssh_cipher
*c
= i
==0 ? preferred_cipher
: ciphers
[i
-1];
1886 ssh2_pkt_addstring_str(c
->name
);
1887 if (i
< lenof(ciphers
))
1888 ssh2_pkt_addstring_str(",");
1890 /* List server->client encryption algorithms. */
1891 ssh2_pkt_addstring_start();
1892 for (i
= 0; i
< lenof(ciphers
)+1; i
++) {
1893 const struct ssh_cipher
*c
= i
==0 ? preferred_cipher
: ciphers
[i
-1];
1894 ssh2_pkt_addstring_str(c
->name
);
1895 if (i
< lenof(ciphers
))
1896 ssh2_pkt_addstring_str(",");
1898 /* List client->server MAC algorithms. */
1899 ssh2_pkt_addstring_start();
1900 for (i
= 0; i
< lenof(macs
); i
++) {
1901 ssh2_pkt_addstring_str(macs
[i
]->name
);
1902 if (i
< lenof(macs
)-1)
1903 ssh2_pkt_addstring_str(",");
1905 /* List server->client MAC algorithms. */
1906 ssh2_pkt_addstring_start();
1907 for (i
= 0; i
< lenof(macs
); i
++) {
1908 ssh2_pkt_addstring_str(macs
[i
]->name
);
1909 if (i
< lenof(macs
)-1)
1910 ssh2_pkt_addstring_str(",");
1912 /* List client->server compression algorithms. */
1913 ssh2_pkt_addstring_start();
1914 for (i
= 0; i
< lenof(compressions
); i
++) {
1915 ssh2_pkt_addstring_str(compressions
[i
]->name
);
1916 if (i
< lenof(compressions
)-1)
1917 ssh2_pkt_addstring_str(",");
1919 /* List server->client compression algorithms. */
1920 ssh2_pkt_addstring_start();
1921 for (i
= 0; i
< lenof(compressions
); i
++) {
1922 ssh2_pkt_addstring_str(compressions
[i
]->name
);
1923 if (i
< lenof(compressions
)-1)
1924 ssh2_pkt_addstring_str(",");
1926 /* List client->server languages. Empty list. */
1927 ssh2_pkt_addstring_start();
1928 /* List server->client languages. Empty list. */
1929 ssh2_pkt_addstring_start();
1930 /* First KEX packet does _not_ follow, because we're not that brave. */
1931 ssh2_pkt_addbool(FALSE
);
1933 ssh2_pkt_adduint32(0);
1934 sha_string(&exhash
, pktout
.data
+5, pktout
.length
-5);
1937 if (!ispkt
) crWaitUntil(ispkt
);
1938 sha_string(&exhash
, pktin
.data
+5, pktin
.length
-5);
1941 * Now examine the other side's KEXINIT to see what we're up
1944 if (pktin
.type
!= SSH2_MSG_KEXINIT
) {
1945 bombout(("expected key exchange packet from server"));
1948 kex
= NULL
; hostkey
= NULL
; cscipher_tobe
= NULL
; sccipher_tobe
= NULL
;
1949 csmac_tobe
= NULL
; scmac_tobe
= NULL
; cscomp_tobe
= NULL
; sccomp_tobe
= NULL
;
1950 pktin
.savedpos
+= 16; /* skip garbage cookie */
1951 ssh2_pkt_getstring(&str
, &len
); /* key exchange algorithms */
1952 for (i
= 0; i
< lenof(kex_algs
); i
++) {
1953 if (in_commasep_string(kex_algs
[i
]->name
, str
, len
)) {
1958 ssh2_pkt_getstring(&str
, &len
); /* host key algorithms */
1959 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
1960 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
1961 hostkey
= hostkey_algs
[i
];
1965 ssh2_pkt_getstring(&str
, &len
); /* client->server cipher */
1966 for (i
= 0; i
< lenof(ciphers
)+1; i
++) {
1967 const struct ssh_cipher
*c
= i
==0 ? preferred_cipher
: ciphers
[i
-1];
1968 if (in_commasep_string(c
->name
, str
, len
)) {
1973 ssh2_pkt_getstring(&str
, &len
); /* server->client cipher */
1974 for (i
= 0; i
< lenof(ciphers
)+1; i
++) {
1975 const struct ssh_cipher
*c
= i
==0 ? preferred_cipher
: ciphers
[i
-1];
1976 if (in_commasep_string(c
->name
, str
, len
)) {
1981 ssh2_pkt_getstring(&str
, &len
); /* client->server mac */
1982 for (i
= 0; i
< lenof(macs
); i
++) {
1983 if (in_commasep_string(macs
[i
]->name
, str
, len
)) {
1984 csmac_tobe
= macs
[i
];
1988 ssh2_pkt_getstring(&str
, &len
); /* server->client mac */
1989 for (i
= 0; i
< lenof(macs
); i
++) {
1990 if (in_commasep_string(macs
[i
]->name
, str
, len
)) {
1991 scmac_tobe
= macs
[i
];
1995 ssh2_pkt_getstring(&str
, &len
); /* client->server compression */
1996 for (i
= 0; i
< lenof(compressions
); i
++) {
1997 if (in_commasep_string(compressions
[i
]->name
, str
, len
)) {
1998 cscomp_tobe
= compressions
[i
];
2002 ssh2_pkt_getstring(&str
, &len
); /* server->client compression */
2003 for (i
= 0; i
< lenof(compressions
); i
++) {
2004 if (in_commasep_string(compressions
[i
]->name
, str
, len
)) {
2005 sccomp_tobe
= compressions
[i
];
2011 * Currently we only support Diffie-Hellman and DSS, so let's
2012 * bomb out if those aren't selected.
2014 if (kex
!= &ssh_diffiehellman
|| hostkey
!= &ssh_dss
) {
2015 bombout(("internal fault: chaos in SSH 2 transport layer"));
2020 * Now we begin the fun. Generate and send e for Diffie-Hellman.
2023 ssh2_pkt_init(SSH2_MSG_KEXDH_INIT
);
2028 if (pktin
.type
!= SSH2_MSG_KEXDH_REPLY
) {
2029 bombout(("expected key exchange packet from server"));
2032 ssh2_pkt_getstring(&hostkeydata
, &hostkeylen
);
2033 f
= ssh2_pkt_getmp();
2034 ssh2_pkt_getstring(&sigdata
, &siglen
);
2038 sha_string(&exhash
, hostkeydata
, hostkeylen
);
2039 sha_mpint(&exhash
, e
);
2040 sha_mpint(&exhash
, f
);
2041 sha_mpint(&exhash
, K
);
2042 SHA_Final(&exhash
, exchange_hash
);
2045 debug(("Exchange hash is:\r\n"));
2046 for (i
= 0; i
< 20; i
++)
2047 debug((" %02x", exchange_hash
[i
]));
2051 hostkey
->setkey(hostkeydata
, hostkeylen
);
2052 if (!hostkey
->verifysig(sigdata
, siglen
, exchange_hash
, 20)) {
2053 bombout(("Server failed host key check"));
2058 * Expect SSH2_MSG_NEWKEYS from server.
2061 if (pktin
.type
!= SSH2_MSG_NEWKEYS
) {
2062 bombout(("expected new-keys packet from server"));
2067 * Authenticate remote host: verify host key. (We've already
2068 * checked the signature of the exchange hash.)
2070 keystr
= hostkey
->fmtkey();
2071 fingerprint
= hostkey
->fingerprint();
2072 verify_ssh_host_key(savedhost
, savedport
, hostkey
->keytype
,
2073 keystr
, fingerprint
);
2074 logevent("Host key fingerprint is:");
2075 logevent(fingerprint
);
2080 * Send SSH2_MSG_NEWKEYS.
2082 ssh2_pkt_init(SSH2_MSG_NEWKEYS
);
2086 * Create and initialise session keys.
2088 cscipher
= cscipher_tobe
;
2089 sccipher
= sccipher_tobe
;
2092 cscomp
= cscomp_tobe
;
2093 sccomp
= sccomp_tobe
;
2095 * Set IVs after keys.
2097 ssh2_mkkey(K
, exchange_hash
, 'C', keyspace
); cscipher
->setcskey(keyspace
);
2098 ssh2_mkkey(K
, exchange_hash
, 'D', keyspace
); cscipher
->setsckey(keyspace
);
2099 ssh2_mkkey(K
, exchange_hash
, 'A', keyspace
); cscipher
->setcsiv(keyspace
);
2100 ssh2_mkkey(K
, exchange_hash
, 'B', keyspace
); sccipher
->setsciv(keyspace
);
2101 ssh2_mkkey(K
, exchange_hash
, 'E', keyspace
); csmac
->setcskey(keyspace
);
2102 ssh2_mkkey(K
, exchange_hash
, 'F', keyspace
); scmac
->setsckey(keyspace
);
2105 * Now we're encrypting. Begin returning 1 to the protocol main
2106 * function so that other things can run on top of the
2107 * transport. If we ever see a KEXINIT, we must go back to the
2112 } while (!(ispkt
&& pktin
.type
== SSH2_MSG_KEXINIT
));
2113 goto begin_key_exchange
;
2119 * Handle the SSH2 userauth and connection layers.
2121 static void do_ssh2_authconn(unsigned char *in
, int inlen
, int ispkt
)
2123 static unsigned long remote_winsize
;
2124 static unsigned long remote_maxpkt
;
2129 * Request userauth protocol, and await a response to it.
2131 ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST
);
2132 ssh2_pkt_addstring("ssh-userauth");
2134 crWaitUntilV(ispkt
);
2135 if (pktin
.type
!= SSH2_MSG_SERVICE_ACCEPT
) {
2136 bombout(("Server refused user authentication protocol"));
2141 * FIXME: currently we support only password authentication.
2142 * (This places us technically in violation of the SSH2 spec.
2143 * We must fix this.)
2147 * Get a username and a password.
2149 static char username
[100];
2150 static char password
[100];
2154 if ((flags
& FLAG_INTERACTIVE
) && !*cfg
.username
) {
2155 c_write("login as: ", 10);
2158 crWaitUntilV(!ispkt
);
2159 while (inlen
--) switch (c
= *in
++) {
2166 c_write("\b \b", 3);
2172 c_write("\b \b", 3);
2181 if (((c
>= ' ' && c
<= '~') ||
2182 ((unsigned char)c
>= 160)) && pos
< 40) {
2183 username
[pos
++] = c
;
2190 username
[strcspn(username
, "\n\r")] = '\0';
2193 strncpy(username
, cfg
.username
, 99);
2194 username
[99] = '\0';
2195 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
2196 sprintf(stuff
, "Using username \"%s\".\r\n", username
);
2197 c_write(stuff
, strlen(stuff
));
2201 if (ssh_get_password
) {
2203 sprintf(prompt
, "%.90s@%.90s's password: ", username
, savedhost
);
2204 if (!ssh_get_password(prompt
, password
, sizeof(password
))) {
2206 * get_password failed to get a password (for
2207 * example because one was supplied on the command
2208 * line which has already failed to work).
2211 logevent("No more passwords to try");
2212 ssh_state
= SSH_STATE_CLOSED
;
2216 c_write("password: ", 10);
2221 crWaitUntilV(!ispkt
);
2222 while (inlen
--) switch (c
= *in
++) {
2239 if (((c
>= ' ' && c
<= '~') ||
2240 ((unsigned char)c
>= 160)) && pos
< 40)
2241 password
[pos
++] = c
;
2248 ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
2249 ssh2_pkt_addstring(username
);
2250 ssh2_pkt_addstring("ssh-connection"); /* service requested */
2251 ssh2_pkt_addstring("password");
2252 ssh2_pkt_addbool(FALSE
);
2253 ssh2_pkt_addstring(password
);
2256 crWaitUntilV(ispkt
);
2257 if (pktin
.type
!= SSH2_MSG_USERAUTH_SUCCESS
) {
2258 c_write("Access denied\r\n", 15);
2259 logevent("Authentication refused");
2265 * Now we're authenticated for the connection protocol. The
2266 * connection protocol will automatically have started at this
2267 * point; there's no need to send SERVICE_REQUEST.
2271 * So now create a channel with a session in it.
2273 mainchan
= malloc(sizeof(struct ssh_channel
));
2274 mainchan
->localid
= 100; /* as good as any */
2275 ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
2276 ssh2_pkt_addstring("session");
2277 ssh2_pkt_adduint32(mainchan
->localid
);
2278 ssh2_pkt_adduint32(0x7FFFFFFFUL
); /* our window size */
2279 ssh2_pkt_adduint32(0x4000UL
); /* our max pkt size */
2281 crWaitUntilV(ispkt
);
2282 if (pktin
.type
!= SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
2283 bombout(("Server refused to open a session"));
2285 /* FIXME: error data comes back in FAILURE packet */
2287 if (ssh2_pkt_getuint32() != mainchan
->localid
) {
2288 bombout(("Server's channel confirmation cited wrong channel"));
2291 mainchan
->remoteid
= ssh2_pkt_getuint32();
2292 mainchan
->u
.v2
.remwindow
= ssh2_pkt_getuint32();
2293 mainchan
->u
.v2
.remmaxpkt
= ssh2_pkt_getuint32();
2294 mainchan
->u
.v2
.outbuffer
= NULL
;
2295 mainchan
->u
.v2
.outbuflen
= mainchan
->u
.v2
.outbufsize
= 0;
2296 logevent("Opened channel for session");
2299 * Now allocate a pty for the session.
2302 ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
2303 ssh2_pkt_adduint32(mainchan
->remoteid
); /* recipient channel */
2304 ssh2_pkt_addstring("pty-req");
2305 ssh2_pkt_addbool(1); /* want reply */
2306 ssh2_pkt_addstring(cfg
.termtype
);
2307 ssh2_pkt_adduint32(cols
);
2308 ssh2_pkt_adduint32(rows
);
2309 ssh2_pkt_adduint32(0); /* pixel width */
2310 ssh2_pkt_adduint32(0); /* pixel height */
2311 ssh2_pkt_addstring_start();
2312 ssh2_pkt_addstring_data("\0", 1);/* TTY_OP_END, no special options */
2316 crWaitUntilV(ispkt
);
2317 if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2318 /* FIXME: be able to handle other channels here */
2319 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2320 continue; /* wrong channel */
2321 mainchan
->u
.v2
.remwindow
+= ssh2_pkt_getuint32();
2323 } while (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2325 if (pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
2326 if (pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
2327 bombout(("Server got confused by pty request"));
2330 c_write("Server refused to allocate pty\r\n", 32);
2332 logevent("Allocated pty");
2337 * Start a shell or a remote command.
2339 ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
2340 ssh2_pkt_adduint32(mainchan
->remoteid
); /* recipient channel */
2341 if (*cfg
.remote_cmd
) {
2342 ssh2_pkt_addstring("exec");
2343 ssh2_pkt_addbool(1); /* want reply */
2344 ssh2_pkt_addstring(cfg
.remote_cmd
);
2346 ssh2_pkt_addstring("shell");
2347 ssh2_pkt_addbool(1); /* want reply */
2351 crWaitUntilV(ispkt
);
2352 if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2353 /* FIXME: be able to handle other channels here */
2354 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2355 continue; /* wrong channel */
2356 mainchan
->u
.v2
.remwindow
+= ssh2_pkt_getuint32();
2358 } while (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2359 if (pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
2360 if (pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
2361 bombout(("Server got confused by shell/command request"));
2364 bombout(("Server refused to start a shell/command"));
2367 logevent("Started a shell/command");
2376 static int try_send
;
2380 if (pktin
.type
== SSH2_MSG_CHANNEL_DATA
||
2381 pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
) {
2384 /* FIXME: be able to handle other channels here */
2385 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2386 continue; /* wrong channel */
2387 if (pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
&&
2388 ssh2_pkt_getuint32() != SSH2_EXTENDED_DATA_STDERR
)
2389 continue; /* extended but not stderr */
2390 ssh2_pkt_getstring(&data
, &length
);
2392 c_writedata(data
, length
);
2394 * Enlarge the window again at the remote side,
2395 * just in case it ever runs down and they fail
2396 * to send us any more data.
2398 ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2399 ssh2_pkt_adduint32(mainchan
->remoteid
);
2400 ssh2_pkt_adduint32(length
);
2403 } else if (pktin
.type
== SSH2_MSG_DISCONNECT
) {
2404 ssh_state
= SSH_STATE_CLOSED
;
2405 logevent("Received disconnect message");
2406 } else if (pktin
.type
== SSH2_MSG_CHANNEL_REQUEST
) {
2407 continue; /* exit status et al; ignore (FIXME?) */
2408 } else if (pktin
.type
== SSH2_MSG_CHANNEL_EOF
) {
2409 continue; /* remote sends EOF; ignore */
2410 } else if (pktin
.type
== SSH2_MSG_CHANNEL_CLOSE
) {
2411 /* FIXME: be able to handle other channels here */
2412 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2413 continue; /* wrong channel */
2414 ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
2415 ssh2_pkt_adduint32(mainchan
->remoteid
);
2417 /* FIXME: mark the channel as closed */
2418 if (1 /* FIXME: "all channels are closed" */) {
2419 logevent("All channels closed. Disconnecting");
2420 ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
2423 continue; /* remote sends close; ignore (FIXME) */
2424 } else if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2425 /* FIXME: be able to handle other channels here */
2426 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2427 continue; /* wrong channel */
2428 mainchan
->u
.v2
.remwindow
+= ssh2_pkt_getuint32();
2431 bombout(("Strange packet received: type %d", pktin
.type
));
2436 * We have spare data. Add it to the channel buffer.
2438 if (mainchan
->u
.v2
.outbufsize
<
2439 mainchan
->u
.v2
.outbuflen
+ inlen
) {
2440 mainchan
->u
.v2
.outbufsize
=
2441 mainchan
->u
.v2
.outbuflen
+ inlen
+ 1024;
2442 mainchan
->u
.v2
.outbuffer
= srealloc(mainchan
->u
.v2
.outbuffer
,
2443 mainchan
->u
.v2
.outbufsize
);
2445 memcpy(mainchan
->u
.v2
.outbuffer
+ mainchan
->u
.v2
.outbuflen
,
2447 mainchan
->u
.v2
.outbuflen
+= inlen
;
2452 * Try to send data on the channel if we can. (FIXME:
2453 * on _all_ channels.)
2455 while (mainchan
->u
.v2
.remwindow
> 0 &&
2456 mainchan
->u
.v2
.outbuflen
> 0) {
2457 unsigned len
= mainchan
->u
.v2
.remwindow
;
2458 if (len
> mainchan
->u
.v2
.outbuflen
)
2459 len
= mainchan
->u
.v2
.outbuflen
;
2460 if (len
> mainchan
->u
.v2
.remmaxpkt
)
2461 len
= mainchan
->u
.v2
.remmaxpkt
;
2462 ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA
);
2463 ssh2_pkt_adduint32(mainchan
->remoteid
);
2464 ssh2_pkt_addstring_start();
2465 ssh2_pkt_addstring_data(mainchan
->u
.v2
.outbuffer
, len
);
2467 mainchan
->u
.v2
.outbuflen
-= len
;
2468 memmove(mainchan
->u
.v2
.outbuffer
, mainchan
->u
.v2
.outbuffer
+len
,
2469 mainchan
->u
.v2
.outbuflen
);
2470 mainchan
->u
.v2
.remwindow
-= len
;
2479 * Handle the top-level SSH2 protocol.
2481 static void ssh2_protocol(unsigned char *in
, int inlen
, int ispkt
)
2483 if (do_ssh2_transport(in
, inlen
, ispkt
) == 0)
2485 do_ssh2_authconn(in
, inlen
, ispkt
);
2489 * Called to set up the connection. Will arrange for WM_NETEVENT
2490 * messages to be passed to the specified window, whose window
2491 * procedure should then call telnet_msg().
2493 * Returns an error message, or NULL on success.
2495 static char *ssh_init (HWND hwnd
, char *host
, int port
, char **realhost
) {
2499 if(crypto_startup() == 0)
2500 return "Microsoft high encryption pack not installed!";
2503 p
= connect_to_host(host
, port
, realhost
);
2508 return "Protocol initialisation error";
2510 if (hwnd
&& WSAAsyncSelect (s
, hwnd
, WM_NETEVENT
, FD_READ
| FD_CLOSE
) == SOCKET_ERROR
)
2511 switch (WSAGetLastError()) {
2512 case WSAENETDOWN
: return "Network is down";
2513 default: return "WSAAsyncSelect(): unknown error";
2520 * Process a WM_NETEVENT message. Will return 0 if the connection
2521 * has closed, or <0 for a socket error.
2523 static int ssh_msg (WPARAM wParam
, LPARAM lParam
) {
2528 * Because reading less than the whole of the available pending
2529 * data can generate an FD_READ event, we need to allow for the
2530 * possibility that FD_READ may arrive with FD_CLOSE already in
2531 * the queue; so it's possible that we can get here even with s
2532 * invalid. If so, we return 1 and don't worry about it.
2534 if (s
== INVALID_SOCKET
)
2537 if (WSAGETSELECTERROR(lParam
) != 0) {
2540 return -WSAGETSELECTERROR(lParam
);
2543 switch (WSAGETSELECTEVENT(lParam
)) {
2546 ret
= recv(s
, buf
, sizeof(buf
), 0);
2547 if (ret
< 0 && WSAGetLastError() == WSAEWOULDBLOCK
)
2549 if (ret
< 0) { /* any _other_ error */
2552 return -10000-WSAGetLastError();
2558 ssh_gotdata (buf
, ret
);
2559 if (ssh_state
== SSH_STATE_CLOSED
) {
2566 return 1; /* shouldn't happen, but WTF */
2570 * Called to send data down the Telnet connection.
2572 static void ssh_send (char *buf
, int len
) {
2573 if (s
== INVALID_SOCKET
)
2576 ssh_protocol(buf
, len
, 0);
2580 * Called to set the size of the window from Telnet's POV.
2582 static void ssh_size(void) {
2583 switch (ssh_state
) {
2584 case SSH_STATE_BEFORE_SIZE
:
2585 case SSH_STATE_CLOSED
:
2586 break; /* do nothing */
2587 case SSH_STATE_INTERMED
:
2588 size_needed
= TRUE
; /* buffer for later */
2590 case SSH_STATE_SESSION
:
2592 send_packet(SSH1_CMSG_WINDOW_SIZE
,
2593 PKT_INT
, rows
, PKT_INT
, cols
,
2594 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
2600 * Send Telnet special codes. TS_EOF is useful for `plink', so you
2601 * can send an EOF and collect resulting output (e.g. `plink
2604 static void ssh_special (Telnet_Special code
) {
2605 if (code
== TS_EOF
) {
2606 if (ssh_version
== 1) {
2607 send_packet(SSH1_CMSG_EOF
, PKT_END
);
2609 ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF
);
2610 ssh2_pkt_adduint32(mainchan
->remoteid
);
2613 logevent("Sent EOF message");
2619 static SOCKET
ssh_socket(void) { return s
; }
2621 static int ssh_sendok(void) { return ssh_send_ok
; }
2623 Backend ssh_backend
= {