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 int ssh_channelcmp(void *av
, void *bv
) {
267 struct ssh_channel
*a
= (struct ssh_channel
*)av
;
268 struct ssh_channel
*b
= (struct ssh_channel
*)bv
;
269 if (a
->localid
< b
->localid
) return -1;
270 if (a
->localid
> b
->localid
) return +1;
273 static int ssh_channelfind(void *av
, void *bv
) {
274 unsigned *a
= (unsigned *)av
;
275 struct ssh_channel
*b
= (struct ssh_channel
*)bv
;
276 if (*a
< b
->localid
) return -1;
277 if (*a
> b
->localid
) return +1;
281 static void s_write (char *buf
, int len
) {
283 int i
= send (s
, buf
, len
, 0);
286 bombout(("Lost connection while sending"));
294 static int s_read (char *buf
, int len
) {
297 int i
= recv (s
, buf
, len
, 0);
300 len
-= i
, buf
+= i
, ret
+= i
;
307 static void c_write (char *buf
, int len
) {
308 if ((flags
& FLAG_STDERR
)) {
310 for (i
= 0; i
< len
; i
++)
312 fputc(buf
[i
], stderr
);
319 static void c_writedata (char *buf
, int len
) {
325 * Collect incoming data in the incoming packet buffer.
326 * Decipher and verify the packet when it is completely read.
327 * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets.
328 * Update the *data and *datalen variables.
329 * Return the additional nr of bytes needed, or 0 when
330 * a complete packet is available.
332 static int ssh1_rdpkt(unsigned char **data
, int *datalen
)
334 struct rdpkt1_state_tag
*st
= &rdpkt1_state
;
343 for (st
->i
= st
->len
= 0; st
->i
< 4; st
->i
++) {
344 while ((*datalen
) == 0)
346 st
->len
= (st
->len
<< 8) + **data
;
347 (*data
)++, (*datalen
)--;
351 if (st
->len
== 0x52656d6f) { /* "Remo"te server has closed ... */
352 st
->len
= 0x300; /* big enough to carry to end */
356 st
->pad
= 8 - (st
->len
% 8);
357 st
->biglen
= st
->len
+ st
->pad
;
358 pktin
.length
= st
->len
- 5;
360 if (pktin
.maxlen
< st
->biglen
) {
361 pktin
.maxlen
= st
->biglen
;
362 pktin
.data
= (pktin
.data
== NULL ?
malloc(st
->biglen
+APIEXTRA
) :
363 realloc(pktin
.data
, st
->biglen
+APIEXTRA
));
365 fatalbox("Out of memory");
368 st
->to_read
= st
->biglen
;
370 while (st
->to_read
> 0) {
371 st
->chunk
= st
->to_read
;
372 while ((*datalen
) == 0)
373 crReturn(st
->to_read
);
374 if (st
->chunk
> (*datalen
))
375 st
->chunk
= (*datalen
);
376 memcpy(st
->p
, *data
, st
->chunk
);
378 *datalen
-= st
->chunk
;
380 st
->to_read
-= st
->chunk
;
384 cipher
->decrypt(pktin
.data
, st
->biglen
);
386 pktin
.type
= pktin
.data
[st
->pad
];
387 pktin
.body
= pktin
.data
+ st
->pad
+ 1;
389 st
->realcrc
= crc32(pktin
.data
, st
->biglen
-4);
390 st
->gotcrc
= GET_32BIT(pktin
.data
+st
->biglen
-4);
391 if (st
->gotcrc
!= st
->realcrc
) {
392 bombout(("Incorrect CRC received on packet"));
396 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
397 pktin
.type
== SSH1_SMSG_STDERR_DATA
||
398 pktin
.type
== SSH1_MSG_DEBUG
||
399 pktin
.type
== SSH1_SMSG_AUTH_TIS_CHALLENGE
||
400 pktin
.type
== SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
401 long strlen
= GET_32BIT(pktin
.body
);
402 if (strlen
+ 4 != pktin
.length
) {
403 bombout(("Received data packet with bogus string length"));
408 if (pktin
.type
== SSH1_MSG_DEBUG
) {
409 /* log debug message */
411 int strlen
= GET_32BIT(pktin
.body
);
412 strcpy(buf
, "Remote: ");
413 if (strlen
> 70) strlen
= 70;
414 memcpy(buf
+8, pktin
.body
+4, strlen
);
415 buf
[8+strlen
] = '\0';
418 } else if (pktin
.type
== SSH1_MSG_IGNORE
) {
426 static int ssh2_rdpkt(unsigned char **data
, int *datalen
)
428 static long len
, pad
, payload
, packetlen
, maclen
;
430 static int cipherblk
;
431 static unsigned long incoming_sequence
= 0;
441 cipherblk
= cipher
->blksize
;
447 if (pktin
.maxlen
< cipherblk
) {
448 pktin
.maxlen
= cipherblk
;
449 pktin
.data
= (pktin
.data
== NULL ?
malloc(cipherblk
+APIEXTRA
) :
450 realloc(pktin
.data
, cipherblk
+APIEXTRA
));
452 fatalbox("Out of memory");
456 * Acquire and decrypt the first block of the packet. This will
457 * contain the length and padding details.
459 for (i
= len
= 0; i
< cipherblk
; i
++) {
460 while ((*datalen
) == 0)
461 crReturn(cipherblk
-i
);
462 pktin
.data
[i
] = *(*data
)++;
466 if (!memcmp(pktin
.data
, "Remo", 4)) {/* "Remo"te server has closed ... */
471 sccipher
->decrypt(pktin
.data
, cipherblk
);
474 * Now get the length and padding figures.
476 len
= GET_32BIT(pktin
.data
);
480 * This enables us to deduce the payload length.
482 payload
= len
- pad
- 1;
484 pktin
.length
= payload
+ 5;
487 * So now we can work out the total packet length.
490 maclen
= scmac ? scmac
->len
: 0;
493 * Adjust memory allocation if packet is too big.
495 if (pktin
.maxlen
< packetlen
+maclen
) {
496 pktin
.maxlen
= packetlen
+maclen
;
497 pktin
.data
= (pktin
.data
== NULL ?
malloc(pktin
.maxlen
+APIEXTRA
) :
498 realloc(pktin
.data
, pktin
.maxlen
+APIEXTRA
));
500 fatalbox("Out of memory");
504 * Read and decrypt the remainder of the packet.
506 for (i
= cipherblk
; i
< packetlen
+ maclen
; i
++) {
507 while ((*datalen
) == 0)
508 crReturn(packetlen
+ maclen
- i
);
509 pktin
.data
[i
] = *(*data
)++;
512 /* Decrypt everything _except_ the MAC. */
514 sccipher
->decrypt(pktin
.data
+ cipherblk
, packetlen
- cipherblk
);
517 debug(("Got packet len=%d pad=%d\r\n", len
, pad
));
518 for (i
= 0; i
< packetlen
; i
++)
519 debug((" %02x", (unsigned char)pktin
.data
[i
]));
526 if (scmac
&& !scmac
->verify(pktin
.data
, len
+4, incoming_sequence
)) {
527 bombout(("Incorrect MAC received on packet"));
530 incoming_sequence
++; /* whether or not we MACed */
533 pktin
.type
= pktin
.data
[5];
535 if (pktin
.type
== SSH2_MSG_IGNORE
|| pktin
.type
== SSH2_MSG_DEBUG
)
536 goto next_packet
; /* FIXME: print DEBUG message */
541 static void ssh_gotdata(unsigned char *data
, int datalen
)
543 while (datalen
> 0) {
544 if ( s_rdpkt(&data
, &datalen
) == 0 ) {
545 ssh_protocol(NULL
, 0, 1);
546 if (ssh_state
== SSH_STATE_CLOSED
) {
554 static void s_wrpkt_start(int type
, int len
) {
557 len
+= 5; /* type and CRC */
561 pktout
.length
= len
-5;
562 if (pktout
.maxlen
< biglen
) {
563 pktout
.maxlen
= biglen
;
565 /* Allocate enough buffer space for extra block
566 * for MS CryptEncrypt() */
567 pktout
.data
= (pktout
.data
== NULL ?
malloc(biglen
+12) :
568 realloc(pktout
.data
, biglen
+12));
570 pktout
.data
= (pktout
.data
== NULL ?
malloc(biglen
+4) :
571 realloc(pktout
.data
, biglen
+4));
574 fatalbox("Out of memory");
578 pktout
.body
= pktout
.data
+4+pad
+1;
581 static void s_wrpkt(void) {
582 int pad
, len
, biglen
, i
;
585 len
= pktout
.length
+ 5; /* type and CRC */
589 pktout
.body
[-1] = pktout
.type
;
590 for (i
=0; i
<pad
; i
++)
591 pktout
.data
[i
+4] = random_byte();
592 crc
= crc32(pktout
.data
+4, biglen
-4);
593 PUT_32BIT(pktout
.data
+biglen
, crc
);
594 PUT_32BIT(pktout
.data
, len
);
597 cipher
->encrypt(pktout
.data
+4, biglen
);
599 s_write(pktout
.data
, biglen
+4);
603 * Construct a packet with the specified contents and
604 * send it to the server.
606 static void send_packet(int pkttype
, ...)
609 unsigned char *p
, *argp
, argchar
;
610 unsigned long argint
;
611 int pktlen
, argtype
, arglen
;
615 va_start(args
, pkttype
);
616 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
619 (void) va_arg(args
, int);
623 (void) va_arg(args
, char);
627 (void) va_arg(args
, unsigned char *);
628 arglen
= va_arg(args
, int);
632 argp
= va_arg(args
, unsigned char *);
633 arglen
= strlen(argp
);
634 pktlen
+= 4 + arglen
;
637 bn
= va_arg(args
, Bignum
);
638 pktlen
+= ssh1_bignum_length(bn
);
646 s_wrpkt_start(pkttype
, pktlen
);
649 va_start(args
, pkttype
);
650 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
653 argint
= va_arg(args
, int);
654 PUT_32BIT(p
, argint
);
658 argchar
= va_arg(args
, unsigned char);
663 argp
= va_arg(args
, unsigned char *);
664 arglen
= va_arg(args
, int);
665 memcpy(p
, argp
, arglen
);
669 argp
= va_arg(args
, unsigned char *);
670 arglen
= strlen(argp
);
671 PUT_32BIT(p
, arglen
);
672 memcpy(p
+ 4, argp
, arglen
);
676 bn
= va_arg(args
, Bignum
);
677 p
+= ssh1_write_bignum(p
, bn
);
688 * Connect to specified host and port.
689 * Returns an error message, or NULL on success.
690 * Also places the canonical host name into `realhost'.
692 static char *connect_to_host(char *host
, int port
, char **realhost
)
702 savedhost
= malloc(1+strlen(host
));
704 fatalbox("Out of memory");
705 strcpy(savedhost
, host
);
708 port
= 22; /* default ssh port */
721 if ( (a
= inet_addr(host
)) == (unsigned long) INADDR_NONE
) {
722 if ( (h
= gethostbyname(host
)) == NULL
)
723 switch (WSAGetLastError()) {
724 case WSAENETDOWN
: return "Network is down";
725 case WSAHOST_NOT_FOUND
: case WSANO_DATA
:
726 return "Host does not exist";
727 case WSATRY_AGAIN
: return "Host not found";
728 default: return "gethostbyname: unknown error";
730 memcpy (&a
, h
->h_addr
, sizeof(a
));
731 *realhost
= h
->h_name
;
742 s
= socket(AF_INET
, SOCK_STREAM
, 0);
743 if (s
== INVALID_SOCKET
)
744 switch (WSAGetLastError()) {
745 case WSAENETDOWN
: return "Network is down";
746 case WSAEAFNOSUPPORT
: return "TCP/IP support not present";
747 default: return "socket(): unknown error";
751 * Bind to local address.
753 addr
.sin_family
= AF_INET
;
754 addr
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
755 addr
.sin_port
= htons(0);
756 if (bind (s
, (struct sockaddr
*)&addr
, sizeof(addr
)) == SOCKET_ERROR
)
757 switch (WSAGetLastError()) {
758 case WSAENETDOWN
: return "Network is down";
759 default: return "bind(): unknown error";
763 * Connect to remote address.
765 addr
.sin_addr
.s_addr
= htonl(a
);
766 addr
.sin_port
= htons((short)port
);
767 if (connect (s
, (struct sockaddr
*)&addr
, sizeof(addr
)) == SOCKET_ERROR
)
768 switch (WSAGetLastError()) {
769 case WSAENETDOWN
: return "Network is down";
770 case WSAECONNREFUSED
: return "Connection refused";
771 case WSAENETUNREACH
: return "Network is unreachable";
772 case WSAEHOSTUNREACH
: return "No route to host";
773 default: return "connect(): unknown error";
777 send(s
, "connect ", 8, 0);
778 send(s
, FWhost
, strlen(FWhost
), 0);
781 sprintf(buf
, " %d\n", FWport
);
782 send (s
, buf
, strlen(buf
), 0);
789 static int ssh_versioncmp(char *a
, char *b
) {
791 unsigned long av
, bv
;
793 av
= strtoul(a
, &ae
, 10);
794 bv
= strtoul(b
, &be
, 10);
795 if (av
!= bv
) return (av
< bv ?
-1 : +1);
796 if (*ae
== '.') ae
++;
797 if (*be
== '.') be
++;
798 av
= strtoul(ae
, &ae
, 10);
799 bv
= strtoul(be
, &be
, 10);
800 if (av
!= bv
) return (av
< bv ?
-1 : +1);
806 * Utility routine for putting an SSH-protocol `string' into a SHA
810 void sha_string(SHA_State
*s
, void *str
, int len
) {
811 unsigned char lenblk
[4];
812 PUT_32BIT(lenblk
, len
);
813 SHA_Bytes(s
, lenblk
, 4);
814 SHA_Bytes(s
, str
, len
);
818 * SSH2 packet construction functions.
820 void ssh2_pkt_adddata(void *data
, int len
) {
821 pktout
.length
+= len
;
822 if (pktout
.maxlen
< pktout
.length
) {
823 pktout
.maxlen
= pktout
.length
+ 256;
824 pktout
.data
= (pktout
.data
== NULL ?
malloc(pktout
.maxlen
+APIEXTRA
) :
825 realloc(pktout
.data
, pktout
.maxlen
+APIEXTRA
));
827 fatalbox("Out of memory");
829 memcpy(pktout
.data
+pktout
.length
-len
, data
, len
);
831 void ssh2_pkt_addbyte(unsigned char byte
) {
832 ssh2_pkt_adddata(&byte
, 1);
834 void ssh2_pkt_init(int pkt_type
) {
836 ssh2_pkt_addbyte((unsigned char)pkt_type
);
838 void ssh2_pkt_addbool(unsigned char value
) {
839 ssh2_pkt_adddata(&value
, 1);
841 void ssh2_pkt_adduint32(unsigned long value
) {
844 ssh2_pkt_adddata(x
, 4);
846 void ssh2_pkt_addstring_start(void) {
847 ssh2_pkt_adduint32(0);
848 pktout
.savedpos
= pktout
.length
;
850 void ssh2_pkt_addstring_str(char *data
) {
851 ssh2_pkt_adddata(data
, strlen(data
));
852 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
853 pktout
.length
- pktout
.savedpos
);
855 void ssh2_pkt_addstring_data(char *data
, int len
) {
856 ssh2_pkt_adddata(data
, len
);
857 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
858 pktout
.length
- pktout
.savedpos
);
860 void ssh2_pkt_addstring(char *data
) {
861 ssh2_pkt_addstring_start();
862 ssh2_pkt_addstring_str(data
);
864 char *ssh2_mpint_fmt(Bignum b
, int *len
) {
867 p
= malloc(n
* 2 + 1);
869 fatalbox("out of memory");
871 for (i
= 0; i
< n
; i
++) {
872 p
[i
*2+1] = (b
[n
-i
] >> 8) & 0xFF;
873 p
[i
*2+2] = (b
[n
-i
] ) & 0xFF;
876 while (p
[i
] == 0 && (p
[i
+1] & 0x80) == 0)
878 memmove(p
, p
+i
, n
*2+1-i
);
882 void ssh2_pkt_addmp(Bignum b
) {
885 p
= ssh2_mpint_fmt(b
, &len
);
886 ssh2_pkt_addstring_start();
887 ssh2_pkt_addstring_data(p
, len
);
890 void ssh2_pkt_send(void) {
891 int cipherblk
, maclen
, padding
, i
;
892 static unsigned long outgoing_sequence
= 0;
895 * Add padding. At least four bytes, and must also bring total
896 * length (minus MAC) up to a multiple of the block size.
898 cipherblk
= cipher ? cipher
->blksize
: 8; /* block size */
899 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
901 padding
+= (cipherblk
- (pktout
.length
+ padding
) % cipherblk
) % cipherblk
;
902 pktout
.data
[4] = padding
;
903 for (i
= 0; i
< padding
; i
++)
904 pktout
.data
[pktout
.length
+ i
] = random_byte();
905 PUT_32BIT(pktout
.data
, pktout
.length
+ padding
- 4);
907 csmac
->generate(pktout
.data
, pktout
.length
+ padding
,
909 outgoing_sequence
++; /* whether or not we MACed */
912 debug(("Sending packet len=%d\r\n", pktout
.length
+padding
));
913 for (i
= 0; i
< pktout
.length
+padding
; i
++)
914 debug((" %02x", (unsigned char)pktout
.data
[i
]));
919 cscipher
->encrypt(pktout
.data
, pktout
.length
+ padding
);
920 maclen
= csmac ? csmac
->len
: 0;
922 s_write(pktout
.data
, pktout
.length
+ padding
+ maclen
);
926 void bndebug(char *string
, Bignum b
) {
929 p
= ssh2_mpint_fmt(b
, &len
);
930 debug(("%s", string
));
931 for (i
= 0; i
< len
; i
++)
932 debug((" %02x", p
[i
]));
938 void sha_mpint(SHA_State
*s
, Bignum b
) {
941 p
= ssh2_mpint_fmt(b
, &len
);
942 sha_string(s
, p
, len
);
947 * SSH2 packet decode functions.
949 unsigned long ssh2_pkt_getuint32(void) {
951 if (pktin
.length
- pktin
.savedpos
< 4)
952 return 0; /* arrgh, no way to decline (FIXME?) */
953 value
= GET_32BIT(pktin
.data
+pktin
.savedpos
);
957 void ssh2_pkt_getstring(char **p
, int *length
) {
959 if (pktin
.length
- pktin
.savedpos
< 4)
961 *length
= GET_32BIT(pktin
.data
+pktin
.savedpos
);
963 if (pktin
.length
- pktin
.savedpos
< *length
)
965 *p
= pktin
.data
+pktin
.savedpos
;
966 pktin
.savedpos
+= *length
;
968 Bignum
ssh2_pkt_getmp(void) {
973 ssh2_pkt_getstring(&p
, &length
);
977 bombout(("internal error: Can't handle negative mpints"));
980 b
= newbn((length
+1)/2);
981 for (i
= 0; i
< length
; i
++) {
984 b
[j
/2+1] |= ((unsigned char)p
[i
]) << 8;
986 b
[j
/2+1] |= ((unsigned char)p
[i
]);
991 static int do_ssh_init(void) {
995 char vlog
[sizeof(vstring
)+20];
1000 while (s_read(&c
, 1) == 1) {
1001 if (c
== 'S' && i
< 2) i
++;
1002 else if (c
== 'S' && i
== 2) i
= 2;
1003 else if (c
== 'H' && i
== 2) break;
1007 if (s_read(&c
,1) != 1 || c
!= 'S') return 0;
1008 if (s_read(&c
,1) != 1 || c
!= 'S') return 0;
1009 if (s_read(&c
,1) != 1 || c
!= 'H') return 0;
1011 strcpy(vstring
, "SSH-");
1013 if (s_read(&c
,1) != 1 || c
!= '-') return 0;
1016 if (s_read(&c
,1) != 1)
1018 if (vsp
< vstring
+sizeof(vstring
)-1)
1024 } else if (i
< sizeof(version
)-1)
1032 sprintf(vlog
, "Server version: %s", vstring
);
1033 vlog
[strcspn(vlog
, "\r\n")] = '\0';
1037 * Server version "1.99" means we can choose whether we use v1
1038 * or v2 protocol. Choice is based on cfg.sshprot.
1040 if (ssh_versioncmp(version
, cfg
.sshprot
== 1 ?
"2.0" : "1.99") >= 0) {
1042 * This is a v2 server. Begin v2 protocol.
1044 char *verstring
= "SSH-2.0-PuTTY";
1047 * Hash our version string and their version string.
1049 sha_string(&exhash
, verstring
, strlen(verstring
));
1050 sha_string(&exhash
, vstring
, strcspn(vstring
, "\r\n"));
1051 sprintf(vstring
, "%s\n", verstring
);
1052 sprintf(vlog
, "We claim version: %s", verstring
);
1054 logevent("Using SSH protocol version 2");
1055 s_write(vstring
, strlen(vstring
));
1056 ssh_protocol
= ssh2_protocol
;
1058 s_rdpkt
= ssh2_rdpkt
;
1061 * This is a v1 server. Begin v1 protocol.
1063 sprintf(vstring
, "SSH-%s-PuTTY\n",
1064 (ssh_versioncmp(version
, "1.5") <= 0 ? version
: "1.5"));
1065 sprintf(vlog
, "We claim version: %s", vstring
);
1066 vlog
[strcspn(vlog
, "\r\n")] = '\0';
1068 logevent("Using SSH protocol version 1");
1069 s_write(vstring
, strlen(vstring
));
1070 ssh_protocol
= ssh1_protocol
;
1072 s_rdpkt
= ssh1_rdpkt
;
1079 * Handle the key exchange and user authentication phases.
1081 static int do_ssh1_login(unsigned char *in
, int inlen
, int ispkt
)
1084 unsigned char *rsabuf
, *keystr1
, *keystr2
;
1085 unsigned char cookie
[8];
1086 struct RSAKey servkey
, hostkey
;
1087 struct MD5Context md5c
;
1088 static unsigned long supported_ciphers_mask
, supported_auths_mask
;
1089 static int tried_publickey
;
1090 static unsigned char session_id
[16];
1095 if (!ispkt
) crWaitUntil(ispkt
);
1097 if (pktin
.type
!= SSH1_SMSG_PUBLIC_KEY
) {
1098 bombout(("Public key packet not received"));
1102 logevent("Received public keys");
1104 memcpy(cookie
, pktin
.body
, 8);
1106 i
= makekey(pktin
.body
+8, &servkey
, &keystr1
, 0);
1107 j
= makekey(pktin
.body
+8+i
, &hostkey
, &keystr2
, 0);
1110 * Log the host key fingerprint.
1114 logevent("Host key fingerprint is:");
1115 strcpy(logmsg
, " ");
1116 hostkey
.comment
= NULL
;
1117 rsa_fingerprint(logmsg
+strlen(logmsg
), sizeof(logmsg
)-strlen(logmsg
),
1122 supported_ciphers_mask
= GET_32BIT(pktin
.body
+12+i
+j
);
1123 supported_auths_mask
= GET_32BIT(pktin
.body
+16+i
+j
);
1126 MD5Update(&md5c
, keystr2
, hostkey
.bytes
);
1127 MD5Update(&md5c
, keystr1
, servkey
.bytes
);
1128 MD5Update(&md5c
, pktin
.body
, 8);
1129 MD5Final(session_id
, &md5c
);
1131 for (i
=0; i
<32; i
++)
1132 session_key
[i
] = random_byte();
1134 len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
1136 rsabuf
= malloc(len
);
1138 fatalbox("Out of memory");
1141 * Verify the host key.
1145 * First format the key into a string.
1147 int len
= rsastr_len(&hostkey
);
1148 char fingerprint
[100];
1149 char *keystr
= malloc(len
);
1151 fatalbox("Out of memory");
1152 rsastr_fmt(keystr
, &hostkey
);
1153 rsa_fingerprint(fingerprint
, sizeof(fingerprint
), &hostkey
);
1154 verify_ssh_host_key(savedhost
, savedport
, "rsa", keystr
, fingerprint
);
1158 for (i
=0; i
<32; i
++) {
1159 rsabuf
[i
] = session_key
[i
];
1161 rsabuf
[i
] ^= session_id
[i
];
1164 if (hostkey
.bytes
> servkey
.bytes
) {
1165 rsaencrypt(rsabuf
, 32, &servkey
);
1166 rsaencrypt(rsabuf
, servkey
.bytes
, &hostkey
);
1168 rsaencrypt(rsabuf
, 32, &hostkey
);
1169 rsaencrypt(rsabuf
, hostkey
.bytes
, &servkey
);
1172 logevent("Encrypted session key");
1174 cipher_type
= cfg
.cipher
== CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH
:
1175 cfg
.cipher
== CIPHER_DES ? SSH_CIPHER_DES
:
1177 if ((supported_ciphers_mask
& (1 << cipher_type
)) == 0) {
1178 c_write("Selected cipher not supported, falling back to 3DES\r\n", 53);
1179 cipher_type
= SSH_CIPHER_3DES
;
1181 switch (cipher_type
) {
1182 case SSH_CIPHER_3DES
: logevent("Using 3DES encryption"); break;
1183 case SSH_CIPHER_DES
: logevent("Using single-DES encryption"); break;
1184 case SSH_CIPHER_BLOWFISH
: logevent("Using Blowfish encryption"); break;
1187 send_packet(SSH1_CMSG_SESSION_KEY
,
1188 PKT_CHAR
, cipher_type
,
1189 PKT_DATA
, cookie
, 8,
1190 PKT_CHAR
, (len
*8) >> 8, PKT_CHAR
, (len
*8) & 0xFF,
1191 PKT_DATA
, rsabuf
, len
,
1195 logevent("Trying to enable encryption...");
1199 cipher
= cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish_ssh1
:
1200 cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
1202 cipher
->sesskey(session_key
);
1206 if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1207 bombout(("Encryption not successfully enabled"));
1211 logevent("Successfully started encryption");
1215 static char username
[100];
1218 if ((flags
& FLAG_INTERACTIVE
) && !*cfg
.username
) {
1219 c_write("login as: ", 10);
1222 crWaitUntil(!ispkt
);
1223 while (inlen
--) switch (c
= *in
++) {
1230 c_write("\b \b", 3);
1236 c_write("\b \b", 3);
1245 if (((c
>= ' ' && c
<= '~') ||
1246 ((unsigned char)c
>= 160)) && pos
< 40) {
1247 username
[pos
++] = c
;
1254 username
[strcspn(username
, "\n\r")] = '\0';
1257 strncpy(username
, cfg
.username
, 99);
1258 username
[99] = '\0';
1259 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
1260 sprintf(stuff
, "Sent username \"%s\".\r\n", username
);
1261 c_write(stuff
, strlen(stuff
));
1265 send_packet(SSH1_CMSG_USER
, PKT_STR
, username
, PKT_END
);
1267 char userlog
[20+sizeof(username
)];
1268 sprintf(userlog
, "Sent username \"%s\"", username
);
1275 tried_publickey
= 0;
1277 while (pktin
.type
== SSH1_SMSG_FAILURE
) {
1278 static char password
[100];
1279 static char prompt
[200];
1282 static int pwpkt_type
;
1284 * Show password prompt, having first obtained it via a TIS
1285 * or CryptoCard exchange if we're doing TIS or CryptoCard
1288 pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
1289 if (agent_exists()) {
1291 * Attempt RSA authentication using Pageant.
1293 static unsigned char request
[5], *response
, *p
;
1294 static int responselen
;
1295 static int i
, nkeys
;
1296 static int authed
= FALSE
;
1299 logevent("Pageant is running. Requesting keys.");
1301 /* Request the keys held by the agent. */
1302 PUT_32BIT(request
, 1);
1303 request
[4] = SSH_AGENTC_REQUEST_RSA_IDENTITIES
;
1304 agent_query(request
, 5, &r
, &responselen
);
1305 response
= (unsigned char *)r
;
1308 nkeys
= GET_32BIT(p
); p
+= 4;
1309 { char buf
[64]; sprintf(buf
, "Pageant has %d keys", nkeys
);
1311 for (i
= 0; i
< nkeys
; i
++) {
1312 static struct RSAKey key
;
1313 static Bignum challenge
;
1314 static char *commentp
;
1315 static int commentlen
;
1317 { char buf
[64]; sprintf(buf
, "Trying Pageant key #%d", i
);
1320 p
+= ssh1_read_bignum(p
, &key
.exponent
);
1321 p
+= ssh1_read_bignum(p
, &key
.modulus
);
1322 commentlen
= GET_32BIT(p
); p
+= 4;
1323 commentp
= p
; p
+= commentlen
;
1324 send_packet(SSH1_CMSG_AUTH_RSA
,
1325 PKT_BIGNUM
, key
.modulus
, PKT_END
);
1327 if (pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
1328 logevent("Key refused");
1331 logevent("Received RSA challenge");
1332 ssh1_read_bignum(pktin
.body
, &challenge
);
1334 char *agentreq
, *q
, *ret
;
1336 len
= 1 + 4; /* message type, bit count */
1337 len
+= ssh1_bignum_length(key
.exponent
);
1338 len
+= ssh1_bignum_length(key
.modulus
);
1339 len
+= ssh1_bignum_length(challenge
);
1340 len
+= 16; /* session id */
1341 len
+= 4; /* response format */
1342 agentreq
= malloc(4 + len
);
1343 PUT_32BIT(agentreq
, len
);
1345 *q
++ = SSH_AGENTC_RSA_CHALLENGE
;
1346 PUT_32BIT(q
, ssh1_bignum_bitcount(key
.modulus
));
1348 q
+= ssh1_write_bignum(q
, key
.exponent
);
1349 q
+= ssh1_write_bignum(q
, key
.modulus
);
1350 q
+= ssh1_write_bignum(q
, challenge
);
1351 memcpy(q
, session_id
, 16); q
+= 16;
1352 PUT_32BIT(q
, 1); /* response format */
1353 agent_query(agentreq
, len
+4, &ret
, &retlen
);
1356 if (ret
[4] == SSH_AGENT_RSA_RESPONSE
) {
1357 logevent("Sending Pageant's response");
1358 send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE
,
1359 PKT_DATA
, ret
+5, 16, PKT_END
);
1362 if (pktin
.type
== SSH1_SMSG_SUCCESS
) {
1363 logevent("Pageant's response accepted");
1364 if (flags
& FLAG_VERBOSE
) {
1365 c_write("Authenticated using RSA key \"",
1367 c_write(commentp
, commentlen
);
1368 c_write("\" from agent\r\n", 14);
1372 logevent("Pageant's response not accepted");
1374 logevent("Pageant failed to answer challenge");
1378 logevent("No reply received from Pageant");
1381 freebn(key
.exponent
);
1382 freebn(key
.modulus
);
1391 if (*cfg
.keyfile
&& !tried_publickey
)
1392 pwpkt_type
= SSH1_CMSG_AUTH_RSA
;
1394 if (pktin
.type
== SSH1_SMSG_FAILURE
&&
1396 (supported_auths_mask
& (1<<SSH1_AUTH_TIS
))) {
1397 pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
1398 logevent("Requested TIS authentication");
1399 send_packet(SSH1_CMSG_AUTH_TIS
, PKT_END
);
1401 if (pktin
.type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
1402 logevent("TIS authentication declined");
1403 if (flags
& FLAG_INTERACTIVE
)
1404 c_write("TIS authentication refused.\r\n", 29);
1406 int challengelen
= ((pktin
.body
[0] << 24) |
1407 (pktin
.body
[1] << 16) |
1408 (pktin
.body
[2] << 8) |
1410 logevent("Received TIS challenge");
1411 if (challengelen
> sizeof(prompt
)-1)
1412 challengelen
= sizeof(prompt
)-1; /* prevent overrun */
1413 memcpy(prompt
, pktin
.body
+4, challengelen
);
1414 prompt
[challengelen
] = '\0';
1417 if (pktin
.type
== SSH1_SMSG_FAILURE
&&
1419 (supported_auths_mask
& (1<<SSH1_AUTH_CCARD
))) {
1420 pwpkt_type
= SSH1_CMSG_AUTH_CCARD_RESPONSE
;
1421 logevent("Requested CryptoCard authentication");
1422 send_packet(SSH1_CMSG_AUTH_CCARD
, PKT_END
);
1424 if (pktin
.type
!= SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
1425 logevent("CryptoCard authentication declined");
1426 c_write("CryptoCard authentication refused.\r\n", 29);
1428 int challengelen
= ((pktin
.body
[0] << 24) |
1429 (pktin
.body
[1] << 16) |
1430 (pktin
.body
[2] << 8) |
1432 logevent("Received CryptoCard challenge");
1433 if (challengelen
> sizeof(prompt
)-1)
1434 challengelen
= sizeof(prompt
)-1; /* prevent overrun */
1435 memcpy(prompt
, pktin
.body
+4, challengelen
);
1436 strncpy(prompt
+ challengelen
, "\r\nResponse : ",
1437 sizeof(prompt
)-challengelen
);
1438 prompt
[sizeof(prompt
)-1] = '\0';
1441 if (pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
) {
1442 sprintf(prompt
, "%.90s@%.90s's password: ",
1443 cfg
.username
, savedhost
);
1445 if (pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
1446 char *comment
= NULL
;
1447 if (flags
& FLAG_VERBOSE
)
1448 c_write("Trying public key authentication.\r\n", 35);
1449 if (!rsakey_encrypted(cfg
.keyfile
, &comment
)) {
1450 if (flags
& FLAG_VERBOSE
)
1451 c_write("No passphrase required.\r\n", 25);
1454 sprintf(prompt
, "Passphrase for key \"%.100s\": ", comment
);
1458 if (ssh_get_password
) {
1459 if (!ssh_get_password(prompt
, password
, sizeof(password
))) {
1461 * get_password failed to get a password (for
1462 * example because one was supplied on the command
1463 * line which has already failed to work).
1466 logevent("No more passwords to try");
1467 ssh_state
= SSH_STATE_CLOSED
;
1471 c_write(prompt
, strlen(prompt
));
1475 crWaitUntil(!ispkt
);
1476 while (inlen
--) switch (c
= *in
++) {
1493 if (((c
>= ' ' && c
<= '~') ||
1494 ((unsigned char)c
>= 160)) && pos
< sizeof(password
))
1495 password
[pos
++] = c
;
1503 if (pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
1505 * Try public key authentication with the specified
1508 static struct RSAKey pubkey
;
1509 static Bignum challenge
, response
;
1511 static unsigned char buffer
[32];
1513 tried_publickey
= 1;
1514 i
= loadrsakey(cfg
.keyfile
, &pubkey
, password
);
1516 c_write("Couldn't load public key from ", 30);
1517 c_write(cfg
.keyfile
, strlen(cfg
.keyfile
));
1518 c_write(".\r\n", 3);
1519 continue; /* go and try password */
1522 c_write("Wrong passphrase.\r\n", 19);
1523 tried_publickey
= 0;
1524 continue; /* try again */
1528 * Send a public key attempt.
1530 send_packet(SSH1_CMSG_AUTH_RSA
,
1531 PKT_BIGNUM
, pubkey
.modulus
, PKT_END
);
1534 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1535 c_write("Server refused our public key.\r\n", 32);
1536 continue; /* go and try password */
1538 if (pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
1539 bombout(("Bizarre response to offer of public key"));
1542 ssh1_read_bignum(pktin
.body
, &challenge
);
1543 response
= rsadecrypt(challenge
, &pubkey
);
1544 freebn(pubkey
.private_exponent
); /* burn the evidence */
1546 for (i
= 0; i
< 32; i
+= 2) {
1547 buffer
[i
] = response
[16-i
/2] >> 8;
1548 buffer
[i
+1] = response
[16-i
/2] & 0xFF;
1552 MD5Update(&md5c
, buffer
, 32);
1553 MD5Update(&md5c
, session_id
, 16);
1554 MD5Final(buffer
, &md5c
);
1556 send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE
,
1557 PKT_DATA
, buffer
, 16, PKT_END
);
1560 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1561 if (flags
& FLAG_VERBOSE
)
1562 c_write("Failed to authenticate with our public key.\r\n",
1564 continue; /* go and try password */
1565 } else if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1566 bombout(("Bizarre response to RSA authentication response"));
1570 break; /* we're through! */
1572 send_packet(pwpkt_type
, PKT_STR
, password
, PKT_END
);
1574 logevent("Sent password");
1575 memset(password
, 0, strlen(password
));
1577 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1578 if (flags
& FLAG_VERBOSE
)
1579 c_write("Access denied\r\n", 15);
1580 logevent("Authentication refused");
1581 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1582 logevent("Received disconnect request");
1583 ssh_state
= SSH_STATE_CLOSED
;
1585 } else if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1586 bombout(("Strange packet received, type %d", pktin
.type
));
1591 logevent("Authentication successful");
1596 static void ssh1_protocol(unsigned char *in
, int inlen
, int ispkt
) {
1601 while (!do_ssh1_login(in
, inlen
, ispkt
)) {
1604 if (ssh_state
== SSH_STATE_CLOSED
)
1607 if (cfg
.agentfwd
&& agent_exists()) {
1608 logevent("Requesting agent forwarding");
1609 send_packet(SSH1_CMSG_AGENT_REQUEST_FORWARDING
, PKT_END
);
1610 do { crReturnV
; } while (!ispkt
);
1611 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1612 bombout(("Protocol confusion"));
1614 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1615 logevent("Agent forwarding refused");
1617 logevent("Agent forwarding enabled");
1621 send_packet(SSH1_CMSG_REQUEST_PTY
,
1622 PKT_STR
, cfg
.termtype
,
1623 PKT_INT
, rows
, PKT_INT
, cols
,
1624 PKT_INT
, 0, PKT_INT
, 0,
1627 ssh_state
= SSH_STATE_INTERMED
;
1628 do { crReturnV
; } while (!ispkt
);
1629 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1630 bombout(("Protocol confusion"));
1632 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1633 c_write("Server refused to allocate pty\r\n", 32);
1635 logevent("Allocated pty");
1638 if (*cfg
.remote_cmd
)
1639 send_packet(SSH1_CMSG_EXEC_CMD
, PKT_STR
, cfg
.remote_cmd
, PKT_END
);
1641 send_packet(SSH1_CMSG_EXEC_SHELL
, PKT_END
);
1642 logevent("Started session");
1644 ssh_state
= SSH_STATE_SESSION
;
1649 ssh_channels
= newtree234(ssh_channelcmp
);
1654 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
1655 pktin
.type
== SSH1_SMSG_STDERR_DATA
) {
1656 long len
= GET_32BIT(pktin
.body
);
1657 c_writedata(pktin
.body
+4, len
);
1658 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1659 ssh_state
= SSH_STATE_CLOSED
;
1660 logevent("Received disconnect request");
1661 } else if (pktin
.type
== SSH1_SMSG_AGENT_OPEN
) {
1662 /* Remote side is trying to open a channel to talk to our
1663 * agent. Give them back a local channel number. */
1665 struct ssh_channel
*c
;
1667 for (c
= first234(ssh_channels
, &e
); c
; c
= next234(&e
)) {
1669 break; /* found a free number */
1672 c
= malloc(sizeof(struct ssh_channel
));
1673 c
->remoteid
= GET_32BIT(pktin
.body
);
1676 c
->type
= SSH1_SMSG_AGENT_OPEN
; /* identify channel type */
1677 c
->u
.a
.lensofar
= 0;
1678 add234(ssh_channels
, c
);
1679 send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
1680 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
1682 } else if (pktin
.type
== SSH1_MSG_CHANNEL_CLOSE
||
1683 pktin
.type
== SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
) {
1684 /* Remote side closes a channel. */
1685 unsigned i
= GET_32BIT(pktin
.body
);
1686 struct ssh_channel
*c
;
1687 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
1690 closetype
= (pktin
.type
== SSH1_MSG_CHANNEL_CLOSE ?
1 : 2);
1691 send_packet(pktin
.type
, PKT_INT
, c
->remoteid
, PKT_END
);
1692 c
->closes
|= closetype
;
1693 if (c
->closes
== 3) {
1694 del234(ssh_channels
, c
);
1698 } else if (pktin
.type
== SSH1_MSG_CHANNEL_DATA
) {
1699 /* Data sent down one of our channels. */
1700 int i
= GET_32BIT(pktin
.body
);
1701 int len
= GET_32BIT(pktin
.body
+4);
1702 unsigned char *p
= pktin
.body
+8;
1703 struct ssh_channel
*c
;
1704 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
1707 case SSH1_SMSG_AGENT_OPEN
:
1708 /* Data for an agent message. Buffer it. */
1710 if (c
->u
.a
.lensofar
< 4) {
1711 int l
= min(4 - c
->u
.a
.lensofar
, len
);
1712 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
, p
, l
);
1713 p
+= l
; len
-= l
; c
->u
.a
.lensofar
+= l
;
1715 if (c
->u
.a
.lensofar
== 4) {
1716 c
->u
.a
.totallen
= 4 + GET_32BIT(c
->u
.a
.msglen
);
1717 c
->u
.a
.message
= malloc(c
->u
.a
.totallen
);
1718 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
1720 if (c
->u
.a
.lensofar
>= 4 && len
> 0) {
1721 int l
= min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
, len
);
1722 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
, p
, l
);
1723 p
+= l
; len
-= l
; c
->u
.a
.lensofar
+= l
;
1725 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
1726 void *reply
, *sentreply
;
1728 agent_query(c
->u
.a
.message
, c
->u
.a
.totallen
,
1733 /* Fake SSH_AGENT_FAILURE. */
1734 sentreply
= "\0\0\0\1\5";
1737 send_packet(SSH1_MSG_CHANNEL_DATA
,
1738 PKT_INT
, c
->remoteid
,
1740 PKT_DATA
, sentreply
, replylen
,
1744 free(c
->u
.a
.message
);
1745 c
->u
.a
.lensofar
= 0;
1751 } else if (pktin
.type
== SSH1_SMSG_SUCCESS
) {
1752 /* may be from EXEC_SHELL on some servers */
1753 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1754 /* may be from EXEC_SHELL on some servers
1755 * if no pty is available or in other odd cases. Ignore */
1756 } else if (pktin
.type
== SSH1_SMSG_EXIT_STATUS
) {
1757 send_packet(SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
1759 bombout(("Strange packet received: type %d", pktin
.type
));
1763 send_packet(SSH1_CMSG_STDIN_DATA
,
1764 PKT_INT
, inlen
, PKT_DATA
, in
, inlen
, PKT_END
);
1772 * Utility routine for decoding comma-separated strings in KEXINIT.
1774 int in_commasep_string(char *needle
, char *haystack
, int haylen
) {
1775 int needlen
= strlen(needle
);
1778 * Is it at the start of the string?
1780 if (haylen
>= needlen
&& /* haystack is long enough */
1781 !memcmp(needle
, haystack
, needlen
) && /* initial match */
1782 (haylen
== needlen
|| haystack
[needlen
] == ',')
1783 /* either , or EOS follows */
1787 * If not, search for the next comma and resume after that.
1788 * If no comma found, terminate.
1790 while (haylen
> 0 && *haystack
!= ',')
1791 haylen
--, haystack
++;
1794 haylen
--, haystack
++; /* skip over comma itself */
1799 * SSH2 key creation method.
1801 void ssh2_mkkey(Bignum K
, char *H
, char chr
, char *keyspace
) {
1803 /* First 20 bytes. */
1806 SHA_Bytes(&s
, H
, 20);
1807 SHA_Bytes(&s
, &chr
, 1);
1808 SHA_Bytes(&s
, H
, 20);
1809 SHA_Final(&s
, keyspace
);
1810 /* Next 20 bytes. */
1813 SHA_Bytes(&s
, H
, 20);
1814 SHA_Bytes(&s
, keyspace
, 20);
1815 SHA_Final(&s
, keyspace
+20);
1819 * Handle the SSH2 transport layer.
1821 static int do_ssh2_transport(unsigned char *in
, int inlen
, int ispkt
)
1825 static Bignum e
, f
, K
;
1826 static const struct ssh_cipher
*cscipher_tobe
= NULL
;
1827 static const struct ssh_cipher
*sccipher_tobe
= NULL
;
1828 static const struct ssh_mac
*csmac_tobe
= NULL
;
1829 static const struct ssh_mac
*scmac_tobe
= NULL
;
1830 static const struct ssh_compress
*cscomp_tobe
= NULL
;
1831 static const struct ssh_compress
*sccomp_tobe
= NULL
;
1832 static char *hostkeydata
, *sigdata
, *keystr
, *fingerprint
;
1833 static int hostkeylen
, siglen
;
1834 static unsigned char exchange_hash
[20];
1835 static unsigned char keyspace
[40];
1836 static const struct ssh_cipher
*preferred_cipher
;
1842 * Set up the preferred cipher.
1844 if (cfg
.cipher
== CIPHER_BLOWFISH
) {
1845 preferred_cipher
= &ssh_blowfish_ssh2
;
1846 } else if (cfg
.cipher
== CIPHER_DES
) {
1847 logevent("Single DES not supported in SSH2; using 3DES");
1848 preferred_cipher
= &ssh_3des_ssh2
;
1849 } else if (cfg
.cipher
== CIPHER_3DES
) {
1850 preferred_cipher
= &ssh_3des_ssh2
;
1852 /* Shouldn't happen, but we do want to initialise to _something_. */
1853 preferred_cipher
= &ssh_3des_ssh2
;
1858 * Construct and send our key exchange packet.
1860 ssh2_pkt_init(SSH2_MSG_KEXINIT
);
1861 for (i
= 0; i
< 16; i
++)
1862 ssh2_pkt_addbyte((unsigned char)random_byte());
1863 /* List key exchange algorithms. */
1864 ssh2_pkt_addstring_start();
1865 for (i
= 0; i
< lenof(kex_algs
); i
++) {
1866 ssh2_pkt_addstring_str(kex_algs
[i
]->name
);
1867 if (i
< lenof(kex_algs
)-1)
1868 ssh2_pkt_addstring_str(",");
1870 /* List server host key algorithms. */
1871 ssh2_pkt_addstring_start();
1872 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
1873 ssh2_pkt_addstring_str(hostkey_algs
[i
]->name
);
1874 if (i
< lenof(hostkey_algs
)-1)
1875 ssh2_pkt_addstring_str(",");
1877 /* List client->server encryption algorithms. */
1878 ssh2_pkt_addstring_start();
1879 for (i
= -1; i
< lenof(ciphers
); i
++) {
1880 const struct ssh_cipher
*c
= i
<0 ? preferred_cipher
: ciphers
[i
];
1881 ssh2_pkt_addstring_str(c
->name
);
1882 if (i
< lenof(ciphers
)-1)
1883 ssh2_pkt_addstring_str(",");
1885 /* List server->client encryption algorithms. */
1886 ssh2_pkt_addstring_start();
1887 for (i
= -1; i
< lenof(ciphers
); i
++) {
1888 const struct ssh_cipher
*c
= i
<0 ? preferred_cipher
: ciphers
[i
];
1889 ssh2_pkt_addstring_str(c
->name
);
1890 if (i
< lenof(ciphers
)-1)
1891 ssh2_pkt_addstring_str(",");
1893 /* List client->server MAC algorithms. */
1894 ssh2_pkt_addstring_start();
1895 for (i
= 0; i
< lenof(macs
); i
++) {
1896 ssh2_pkt_addstring_str(macs
[i
]->name
);
1897 if (i
< lenof(macs
)-1)
1898 ssh2_pkt_addstring_str(",");
1900 /* List server->client MAC algorithms. */
1901 ssh2_pkt_addstring_start();
1902 for (i
= 0; i
< lenof(macs
); i
++) {
1903 ssh2_pkt_addstring_str(macs
[i
]->name
);
1904 if (i
< lenof(macs
)-1)
1905 ssh2_pkt_addstring_str(",");
1907 /* List client->server compression algorithms. */
1908 ssh2_pkt_addstring_start();
1909 for (i
= 0; i
< lenof(compressions
); i
++) {
1910 ssh2_pkt_addstring_str(compressions
[i
]->name
);
1911 if (i
< lenof(compressions
)-1)
1912 ssh2_pkt_addstring_str(",");
1914 /* List server->client compression algorithms. */
1915 ssh2_pkt_addstring_start();
1916 for (i
= 0; i
< lenof(compressions
); i
++) {
1917 ssh2_pkt_addstring_str(compressions
[i
]->name
);
1918 if (i
< lenof(compressions
)-1)
1919 ssh2_pkt_addstring_str(",");
1921 /* List client->server languages. Empty list. */
1922 ssh2_pkt_addstring_start();
1923 /* List server->client languages. Empty list. */
1924 ssh2_pkt_addstring_start();
1925 /* First KEX packet does _not_ follow, because we're not that brave. */
1926 ssh2_pkt_addbool(FALSE
);
1928 ssh2_pkt_adduint32(0);
1929 sha_string(&exhash
, pktout
.data
+5, pktout
.length
-5);
1932 if (!ispkt
) crWaitUntil(ispkt
);
1933 sha_string(&exhash
, pktin
.data
+5, pktin
.length
-5);
1936 * Now examine the other side's KEXINIT to see what we're up
1939 if (pktin
.type
!= SSH2_MSG_KEXINIT
) {
1940 bombout(("expected key exchange packet from server"));
1943 kex
= NULL
; hostkey
= NULL
; cscipher_tobe
= NULL
; sccipher_tobe
= NULL
;
1944 csmac_tobe
= NULL
; scmac_tobe
= NULL
; cscomp_tobe
= NULL
; sccomp_tobe
= NULL
;
1945 pktin
.savedpos
+= 16; /* skip garbage cookie */
1946 ssh2_pkt_getstring(&str
, &len
); /* key exchange algorithms */
1947 for (i
= 0; i
< lenof(kex_algs
); i
++) {
1948 if (in_commasep_string(kex_algs
[i
]->name
, str
, len
)) {
1953 ssh2_pkt_getstring(&str
, &len
); /* host key algorithms */
1954 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
1955 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
1956 hostkey
= hostkey_algs
[i
];
1960 ssh2_pkt_getstring(&str
, &len
); /* client->server cipher */
1961 for (i
= -1; i
< lenof(ciphers
); i
++) {
1962 const struct ssh_cipher
*c
= i
<0 ? preferred_cipher
: ciphers
[i
];
1963 if (in_commasep_string(c
->name
, str
, len
)) {
1964 cscipher_tobe
= ciphers
[i
];
1968 ssh2_pkt_getstring(&str
, &len
); /* server->client cipher */
1969 for (i
= -1; i
< lenof(ciphers
); i
++) {
1970 const struct ssh_cipher
*c
= i
<0 ? preferred_cipher
: ciphers
[i
];
1971 if (in_commasep_string(c
->name
, str
, len
)) {
1972 sccipher_tobe
= ciphers
[i
];
1976 ssh2_pkt_getstring(&str
, &len
); /* client->server mac */
1977 for (i
= 0; i
< lenof(macs
); i
++) {
1978 if (in_commasep_string(macs
[i
]->name
, str
, len
)) {
1979 csmac_tobe
= macs
[i
];
1983 ssh2_pkt_getstring(&str
, &len
); /* server->client mac */
1984 for (i
= 0; i
< lenof(macs
); i
++) {
1985 if (in_commasep_string(macs
[i
]->name
, str
, len
)) {
1986 scmac_tobe
= macs
[i
];
1990 ssh2_pkt_getstring(&str
, &len
); /* client->server compression */
1991 for (i
= 0; i
< lenof(compressions
); i
++) {
1992 if (in_commasep_string(compressions
[i
]->name
, str
, len
)) {
1993 cscomp_tobe
= compressions
[i
];
1997 ssh2_pkt_getstring(&str
, &len
); /* server->client compression */
1998 for (i
= 0; i
< lenof(compressions
); i
++) {
1999 if (in_commasep_string(compressions
[i
]->name
, str
, len
)) {
2000 sccomp_tobe
= compressions
[i
];
2006 * Currently we only support Diffie-Hellman and DSS, so let's
2007 * bomb out if those aren't selected.
2009 if (kex
!= &ssh_diffiehellman
|| hostkey
!= &ssh_dss
) {
2010 bombout(("internal fault: chaos in SSH 2 transport layer"));
2015 * Now we begin the fun. Generate and send e for Diffie-Hellman.
2018 ssh2_pkt_init(SSH2_MSG_KEXDH_INIT
);
2023 if (pktin
.type
!= SSH2_MSG_KEXDH_REPLY
) {
2024 bombout(("expected key exchange packet from server"));
2027 ssh2_pkt_getstring(&hostkeydata
, &hostkeylen
);
2028 f
= ssh2_pkt_getmp();
2029 ssh2_pkt_getstring(&sigdata
, &siglen
);
2033 sha_string(&exhash
, hostkeydata
, hostkeylen
);
2034 sha_mpint(&exhash
, e
);
2035 sha_mpint(&exhash
, f
);
2036 sha_mpint(&exhash
, K
);
2037 SHA_Final(&exhash
, exchange_hash
);
2040 debug(("Exchange hash is:\r\n"));
2041 for (i
= 0; i
< 20; i
++)
2042 debug((" %02x", exchange_hash
[i
]));
2046 hostkey
->setkey(hostkeydata
, hostkeylen
);
2047 if (!hostkey
->verifysig(sigdata
, siglen
, exchange_hash
, 20)) {
2048 bombout(("Server failed host key check"));
2053 * Expect SSH2_MSG_NEWKEYS from server.
2056 if (pktin
.type
!= SSH2_MSG_NEWKEYS
) {
2057 bombout(("expected new-keys packet from server"));
2062 * Authenticate remote host: verify host key. (We've already
2063 * checked the signature of the exchange hash.)
2065 keystr
= hostkey
->fmtkey();
2066 fingerprint
= hostkey
->fingerprint();
2067 verify_ssh_host_key(savedhost
, savedport
, hostkey
->keytype
,
2068 keystr
, fingerprint
);
2069 logevent("Host key fingerprint is:");
2070 logevent(fingerprint
);
2075 * Send SSH2_MSG_NEWKEYS.
2077 ssh2_pkt_init(SSH2_MSG_NEWKEYS
);
2081 * Create and initialise session keys.
2083 cscipher
= cscipher_tobe
;
2084 sccipher
= sccipher_tobe
;
2087 cscomp
= cscomp_tobe
;
2088 sccomp
= sccomp_tobe
;
2090 * Set IVs after keys.
2092 ssh2_mkkey(K
, exchange_hash
, 'C', keyspace
); cscipher
->setcskey(keyspace
);
2093 ssh2_mkkey(K
, exchange_hash
, 'D', keyspace
); cscipher
->setsckey(keyspace
);
2094 ssh2_mkkey(K
, exchange_hash
, 'A', keyspace
); cscipher
->setcsiv(keyspace
);
2095 ssh2_mkkey(K
, exchange_hash
, 'B', keyspace
); sccipher
->setsciv(keyspace
);
2096 ssh2_mkkey(K
, exchange_hash
, 'E', keyspace
); csmac
->setcskey(keyspace
);
2097 ssh2_mkkey(K
, exchange_hash
, 'F', keyspace
); scmac
->setsckey(keyspace
);
2100 * Now we're encrypting. Begin returning 1 to the protocol main
2101 * function so that other things can run on top of the
2102 * transport. If we ever see a KEXINIT, we must go back to the
2107 } while (!(ispkt
&& pktin
.type
== SSH2_MSG_KEXINIT
));
2108 goto begin_key_exchange
;
2114 * Handle the SSH2 userauth and connection layers.
2116 static void do_ssh2_authconn(unsigned char *in
, int inlen
, int ispkt
)
2118 static unsigned long remote_winsize
;
2119 static unsigned long remote_maxpkt
;
2124 * Request userauth protocol, and await a response to it.
2126 ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST
);
2127 ssh2_pkt_addstring("ssh-userauth");
2129 crWaitUntilV(ispkt
);
2130 if (pktin
.type
!= SSH2_MSG_SERVICE_ACCEPT
) {
2131 bombout(("Server refused user authentication protocol"));
2136 * FIXME: currently we support only password authentication.
2137 * (This places us technically in violation of the SSH2 spec.
2138 * We must fix this.)
2142 * Get a username and a password.
2144 static char username
[100];
2145 static char password
[100];
2149 if ((flags
& FLAG_INTERACTIVE
) && !*cfg
.username
) {
2150 c_write("login as: ", 10);
2153 crWaitUntilV(!ispkt
);
2154 while (inlen
--) switch (c
= *in
++) {
2161 c_write("\b \b", 3);
2167 c_write("\b \b", 3);
2176 if (((c
>= ' ' && c
<= '~') ||
2177 ((unsigned char)c
>= 160)) && pos
< 40) {
2178 username
[pos
++] = c
;
2185 username
[strcspn(username
, "\n\r")] = '\0';
2188 strncpy(username
, cfg
.username
, 99);
2189 username
[99] = '\0';
2190 if ((flags
& FLAG_VERBOSE
) || (flags
& FLAG_INTERACTIVE
)) {
2191 sprintf(stuff
, "Using username \"%s\".\r\n", username
);
2192 c_write(stuff
, strlen(stuff
));
2196 if (ssh_get_password
) {
2198 sprintf(prompt
, "%.90s@%.90s's password: ", cfg
.username
, savedhost
);
2199 if (!ssh_get_password(prompt
, password
, sizeof(password
))) {
2201 * get_password failed to get a password (for
2202 * example because one was supplied on the command
2203 * line which has already failed to work).
2206 logevent("No more passwords to try");
2207 ssh_state
= SSH_STATE_CLOSED
;
2211 c_write("password: ", 10);
2216 crWaitUntilV(!ispkt
);
2217 while (inlen
--) switch (c
= *in
++) {
2234 if (((c
>= ' ' && c
<= '~') ||
2235 ((unsigned char)c
>= 160)) && pos
< 40)
2236 password
[pos
++] = c
;
2243 ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
2244 ssh2_pkt_addstring(username
);
2245 ssh2_pkt_addstring("ssh-connection"); /* service requested */
2246 ssh2_pkt_addstring("password");
2247 ssh2_pkt_addbool(FALSE
);
2248 ssh2_pkt_addstring(password
);
2251 crWaitUntilV(ispkt
);
2252 if (pktin
.type
!= SSH2_MSG_USERAUTH_SUCCESS
) {
2253 c_write("Access denied\r\n", 15);
2254 logevent("Authentication refused");
2260 * Now we're authenticated for the connection protocol. The
2261 * connection protocol will automatically have started at this
2262 * point; there's no need to send SERVICE_REQUEST.
2266 * So now create a channel with a session in it.
2268 mainchan
= malloc(sizeof(struct ssh_channel
));
2269 mainchan
->localid
= 100; /* as good as any */
2270 ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
2271 ssh2_pkt_addstring("session");
2272 ssh2_pkt_adduint32(mainchan
->localid
);
2273 ssh2_pkt_adduint32(0x7FFFFFFFUL
); /* our window size */
2274 ssh2_pkt_adduint32(0x4000UL
); /* our max pkt size */
2276 crWaitUntilV(ispkt
);
2277 if (pktin
.type
!= SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
2278 bombout(("Server refused to open a session"));
2280 /* FIXME: error data comes back in FAILURE packet */
2282 if (ssh2_pkt_getuint32() != mainchan
->localid
) {
2283 bombout(("Server's channel confirmation cited wrong channel"));
2286 mainchan
->remoteid
= ssh2_pkt_getuint32();
2287 mainchan
->u
.v2
.remwindow
= ssh2_pkt_getuint32();
2288 mainchan
->u
.v2
.remmaxpkt
= ssh2_pkt_getuint32();
2289 mainchan
->u
.v2
.outbuffer
= NULL
;
2290 mainchan
->u
.v2
.outbuflen
= mainchan
->u
.v2
.outbufsize
= 0;
2291 logevent("Opened channel for session");
2294 * Now allocate a pty for the session.
2297 ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
2298 ssh2_pkt_adduint32(mainchan
->remoteid
); /* recipient channel */
2299 ssh2_pkt_addstring("pty-req");
2300 ssh2_pkt_addbool(1); /* want reply */
2301 ssh2_pkt_addstring(cfg
.termtype
);
2302 ssh2_pkt_adduint32(cols
);
2303 ssh2_pkt_adduint32(rows
);
2304 ssh2_pkt_adduint32(0); /* pixel width */
2305 ssh2_pkt_adduint32(0); /* pixel height */
2306 ssh2_pkt_addstring_start();
2307 ssh2_pkt_addstring_data("\0", 1);/* TTY_OP_END, no special options */
2311 crWaitUntilV(ispkt
);
2312 if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2313 /* FIXME: be able to handle other channels here */
2314 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2315 continue; /* wrong channel */
2316 mainchan
->u
.v2
.remwindow
+= ssh2_pkt_getuint32();
2318 } while (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2320 if (pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
2321 if (pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
2322 bombout(("Server got confused by pty request"));
2325 c_write("Server refused to allocate pty\r\n", 32);
2327 logevent("Allocated pty");
2332 * Start a shell or a remote command.
2334 ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
2335 ssh2_pkt_adduint32(mainchan
->remoteid
); /* recipient channel */
2336 if (*cfg
.remote_cmd
) {
2337 ssh2_pkt_addstring("exec");
2338 ssh2_pkt_addbool(1); /* want reply */
2339 ssh2_pkt_addstring(cfg
.remote_cmd
);
2341 ssh2_pkt_addstring("shell");
2342 ssh2_pkt_addbool(1); /* want reply */
2346 crWaitUntilV(ispkt
);
2347 if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2348 /* FIXME: be able to handle other channels here */
2349 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2350 continue; /* wrong channel */
2351 mainchan
->u
.v2
.remwindow
+= ssh2_pkt_getuint32();
2353 } while (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2354 if (pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
2355 if (pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
2356 bombout(("Server got confused by shell/command request"));
2359 bombout(("Server refused to start a shell/command"));
2362 logevent("Started a shell/command");
2371 static int try_send
;
2375 if (pktin
.type
== SSH2_MSG_CHANNEL_DATA
||
2376 pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
) {
2379 /* FIXME: be able to handle other channels here */
2380 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2381 continue; /* wrong channel */
2382 if (pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
&&
2383 ssh2_pkt_getuint32() != SSH2_EXTENDED_DATA_STDERR
)
2384 continue; /* extended but not stderr */
2385 ssh2_pkt_getstring(&data
, &length
);
2387 c_writedata(data
, length
);
2389 * Enlarge the window again at the remote side,
2390 * just in case it ever runs down and they fail
2391 * to send us any more data.
2393 ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2394 ssh2_pkt_adduint32(mainchan
->remoteid
);
2395 ssh2_pkt_adduint32(length
);
2398 } else if (pktin
.type
== SSH2_MSG_DISCONNECT
) {
2399 ssh_state
= SSH_STATE_CLOSED
;
2400 logevent("Received disconnect message");
2401 } else if (pktin
.type
== SSH2_MSG_CHANNEL_REQUEST
) {
2402 continue; /* exit status et al; ignore (FIXME?) */
2403 } else if (pktin
.type
== SSH2_MSG_CHANNEL_EOF
) {
2404 continue; /* remote sends EOF; ignore */
2405 } else if (pktin
.type
== SSH2_MSG_CHANNEL_CLOSE
) {
2406 /* FIXME: be able to handle other channels here */
2407 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2408 continue; /* wrong channel */
2409 ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
2410 ssh2_pkt_adduint32(mainchan
->remoteid
);
2412 /* FIXME: mark the channel as closed */
2413 if (1 /* FIXME: "all channels are closed" */) {
2414 logevent("All channels closed. Disconnecting");
2415 ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
2418 continue; /* remote sends close; ignore (FIXME) */
2419 } else if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2420 /* FIXME: be able to handle other channels here */
2421 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2422 continue; /* wrong channel */
2423 mainchan
->u
.v2
.remwindow
+= ssh2_pkt_getuint32();
2426 bombout(("Strange packet received: type %d", pktin
.type
));
2431 * We have spare data. Add it to the channel buffer.
2433 if (mainchan
->u
.v2
.outbufsize
<
2434 mainchan
->u
.v2
.outbuflen
+ inlen
) {
2435 mainchan
->u
.v2
.outbufsize
=
2436 mainchan
->u
.v2
.outbuflen
+ inlen
+ 1024;
2437 mainchan
->u
.v2
.outbuffer
= srealloc(mainchan
->u
.v2
.outbuffer
,
2438 mainchan
->u
.v2
.outbufsize
);
2440 memcpy(mainchan
->u
.v2
.outbuffer
+ mainchan
->u
.v2
.outbuflen
,
2442 mainchan
->u
.v2
.outbuflen
+= inlen
;
2447 * Try to send data on the channel if we can. (FIXME:
2448 * on _all_ channels.)
2450 while (mainchan
->u
.v2
.remwindow
> 0 &&
2451 mainchan
->u
.v2
.outbuflen
> 0) {
2452 unsigned len
= mainchan
->u
.v2
.remwindow
;
2453 if (len
> mainchan
->u
.v2
.outbuflen
)
2454 len
= mainchan
->u
.v2
.outbuflen
;
2455 if (len
> mainchan
->u
.v2
.remmaxpkt
)
2456 len
= mainchan
->u
.v2
.remmaxpkt
;
2457 ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA
);
2458 ssh2_pkt_adduint32(mainchan
->remoteid
);
2459 ssh2_pkt_addstring_start();
2460 ssh2_pkt_addstring_data(mainchan
->u
.v2
.outbuffer
, len
);
2462 mainchan
->u
.v2
.outbuflen
-= len
;
2463 memmove(mainchan
->u
.v2
.outbuffer
, mainchan
->u
.v2
.outbuffer
+len
,
2464 mainchan
->u
.v2
.outbuflen
);
2465 mainchan
->u
.v2
.remwindow
-= len
;
2474 * Handle the top-level SSH2 protocol.
2476 static void ssh2_protocol(unsigned char *in
, int inlen
, int ispkt
)
2478 if (do_ssh2_transport(in
, inlen
, ispkt
) == 0)
2480 do_ssh2_authconn(in
, inlen
, ispkt
);
2484 * Called to set up the connection. Will arrange for WM_NETEVENT
2485 * messages to be passed to the specified window, whose window
2486 * procedure should then call telnet_msg().
2488 * Returns an error message, or NULL on success.
2490 static char *ssh_init (HWND hwnd
, char *host
, int port
, char **realhost
) {
2494 if(crypto_startup() == 0)
2495 return "Microsoft high encryption pack not installed!";
2498 p
= connect_to_host(host
, port
, realhost
);
2503 return "Protocol initialisation error";
2505 if (hwnd
&& WSAAsyncSelect (s
, hwnd
, WM_NETEVENT
, FD_READ
| FD_CLOSE
) == SOCKET_ERROR
)
2506 switch (WSAGetLastError()) {
2507 case WSAENETDOWN
: return "Network is down";
2508 default: return "WSAAsyncSelect(): unknown error";
2515 * Process a WM_NETEVENT message. Will return 0 if the connection
2516 * has closed, or <0 for a socket error.
2518 static int ssh_msg (WPARAM wParam
, LPARAM lParam
) {
2523 * Because reading less than the whole of the available pending
2524 * data can generate an FD_READ event, we need to allow for the
2525 * possibility that FD_READ may arrive with FD_CLOSE already in
2526 * the queue; so it's possible that we can get here even with s
2527 * invalid. If so, we return 1 and don't worry about it.
2529 if (s
== INVALID_SOCKET
)
2532 if (WSAGETSELECTERROR(lParam
) != 0) {
2535 return -WSAGETSELECTERROR(lParam
);
2538 switch (WSAGETSELECTEVENT(lParam
)) {
2541 ret
= recv(s
, buf
, sizeof(buf
), 0);
2542 if (ret
< 0 && WSAGetLastError() == WSAEWOULDBLOCK
)
2544 if (ret
< 0) { /* any _other_ error */
2547 return -10000-WSAGetLastError();
2553 ssh_gotdata (buf
, ret
);
2554 if (ssh_state
== SSH_STATE_CLOSED
) {
2561 return 1; /* shouldn't happen, but WTF */
2565 * Called to send data down the Telnet connection.
2567 static void ssh_send (char *buf
, int len
) {
2568 if (s
== INVALID_SOCKET
)
2571 ssh_protocol(buf
, len
, 0);
2575 * Called to set the size of the window from Telnet's POV.
2577 static void ssh_size(void) {
2578 switch (ssh_state
) {
2579 case SSH_STATE_BEFORE_SIZE
:
2580 case SSH_STATE_CLOSED
:
2581 break; /* do nothing */
2582 case SSH_STATE_INTERMED
:
2583 size_needed
= TRUE
; /* buffer for later */
2585 case SSH_STATE_SESSION
:
2587 send_packet(SSH1_CMSG_WINDOW_SIZE
,
2588 PKT_INT
, rows
, PKT_INT
, cols
,
2589 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
2595 * Send Telnet special codes. TS_EOF is useful for `plink', so you
2596 * can send an EOF and collect resulting output (e.g. `plink
2599 static void ssh_special (Telnet_Special code
) {
2600 if (code
== TS_EOF
) {
2601 if (ssh_version
== 1) {
2602 send_packet(SSH1_CMSG_EOF
, PKT_END
);
2604 ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF
);
2605 ssh2_pkt_adduint32(mainchan
->remoteid
);
2608 logevent("Sent EOF message");
2614 static SOCKET
ssh_socket(void) { return s
; }
2616 static int ssh_sendok(void) { return ssh_send_ok
; }
2618 Backend ssh_backend
= {