19 #define logevent(s) { logevent(s); \
20 if (!(flags & FLAG_CONNECTION) && (flags & FLAG_VERBOSE)) \
21 fprintf(stderr, "%s\n", s); }
23 #define SSH1_MSG_DISCONNECT 1
24 #define SSH1_SMSG_PUBLIC_KEY 2
25 #define SSH1_CMSG_SESSION_KEY 3
26 #define SSH1_CMSG_USER 4
27 #define SSH1_CMSG_AUTH_RSA 6
28 #define SSH1_SMSG_AUTH_RSA_CHALLENGE 7
29 #define SSH1_CMSG_AUTH_RSA_RESPONSE 8
30 #define SSH1_CMSG_AUTH_PASSWORD 9
31 #define SSH1_CMSG_REQUEST_PTY 10
32 #define SSH1_CMSG_WINDOW_SIZE 11
33 #define SSH1_CMSG_EXEC_SHELL 12
34 #define SSH1_CMSG_EXEC_CMD 13
35 #define SSH1_SMSG_SUCCESS 14
36 #define SSH1_SMSG_FAILURE 15
37 #define SSH1_CMSG_STDIN_DATA 16
38 #define SSH1_SMSG_STDOUT_DATA 17
39 #define SSH1_SMSG_STDERR_DATA 18
40 #define SSH1_CMSG_EOF 19
41 #define SSH1_SMSG_EXIT_STATUS 20
42 #define SSH1_MSG_CHANNEL_OPEN_CONFIRMATION 21
43 #define SSH1_MSG_CHANNEL_OPEN_FAILURE 22
44 #define SSH1_MSG_CHANNEL_DATA 23
45 #define SSH1_MSG_CHANNEL_CLOSE 24
46 #define SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION 25
47 #define SSH1_CMSG_AGENT_REQUEST_FORWARDING 30
48 #define SSH1_SMSG_AGENT_OPEN 31
49 #define SSH1_CMSG_EXIT_CONFIRMATION 33
50 #define SSH1_MSG_IGNORE 32
51 #define SSH1_MSG_DEBUG 36
52 #define SSH1_CMSG_AUTH_TIS 39
53 #define SSH1_SMSG_AUTH_TIS_CHALLENGE 40
54 #define SSH1_CMSG_AUTH_TIS_RESPONSE 41
55 #define SSH1_CMSG_AUTH_CCARD 70
56 #define SSH1_SMSG_AUTH_CCARD_CHALLENGE 71
57 #define SSH1_CMSG_AUTH_CCARD_RESPONSE 72
59 #define SSH1_AUTH_TIS 5
60 #define SSH1_AUTH_CCARD 16
62 #define SSH_AGENTC_REQUEST_RSA_IDENTITIES 1
63 #define SSH_AGENT_RSA_IDENTITIES_ANSWER 2
64 #define SSH_AGENTC_RSA_CHALLENGE 3
65 #define SSH_AGENT_RSA_RESPONSE 4
66 #define SSH_AGENT_FAILURE 5
67 #define SSH_AGENT_SUCCESS 6
68 #define SSH_AGENTC_ADD_RSA_IDENTITY 7
69 #define SSH_AGENTC_REMOVE_RSA_IDENTITY 8
71 #define SSH2_MSG_DISCONNECT 1
72 #define SSH2_MSG_IGNORE 2
73 #define SSH2_MSG_UNIMPLEMENTED 3
74 #define SSH2_MSG_DEBUG 4
75 #define SSH2_MSG_SERVICE_REQUEST 5
76 #define SSH2_MSG_SERVICE_ACCEPT 6
77 #define SSH2_MSG_KEXINIT 20
78 #define SSH2_MSG_NEWKEYS 21
79 #define SSH2_MSG_KEXDH_INIT 30
80 #define SSH2_MSG_KEXDH_REPLY 31
81 #define SSH2_MSG_USERAUTH_REQUEST 50
82 #define SSH2_MSG_USERAUTH_FAILURE 51
83 #define SSH2_MSG_USERAUTH_SUCCESS 52
84 #define SSH2_MSG_USERAUTH_BANNER 53
85 #define SSH2_MSG_USERAUTH_PK_OK 60
86 #define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ 60
87 #define SSH2_MSG_GLOBAL_REQUEST 80
88 #define SSH2_MSG_REQUEST_SUCCESS 81
89 #define SSH2_MSG_REQUEST_FAILURE 82
90 #define SSH2_MSG_CHANNEL_OPEN 90
91 #define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION 91
92 #define SSH2_MSG_CHANNEL_OPEN_FAILURE 92
93 #define SSH2_MSG_CHANNEL_WINDOW_ADJUST 93
94 #define SSH2_MSG_CHANNEL_DATA 94
95 #define SSH2_MSG_CHANNEL_EXTENDED_DATA 95
96 #define SSH2_MSG_CHANNEL_EOF 96
97 #define SSH2_MSG_CHANNEL_CLOSE 97
98 #define SSH2_MSG_CHANNEL_REQUEST 98
99 #define SSH2_MSG_CHANNEL_SUCCESS 99
100 #define SSH2_MSG_CHANNEL_FAILURE 100
102 #define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1
103 #define SSH2_OPEN_CONNECT_FAILED 2
104 #define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3
105 #define SSH2_OPEN_RESOURCE_SHORTAGE 4
106 #define SSH2_EXTENDED_DATA_STDERR 1
108 #define GET_32BIT(cp) \
109 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
110 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
111 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
112 ((unsigned long)(unsigned char)(cp)[3]))
114 #define PUT_32BIT(cp, value) { \
115 (cp)[0] = (unsigned char)((value) >> 24); \
116 (cp)[1] = (unsigned char)((value) >> 16); \
117 (cp)[2] = (unsigned char)((value) >> 8); \
118 (cp)[3] = (unsigned char)(value); }
120 enum { PKT_END
, PKT_INT
, PKT_CHAR
, PKT_DATA
, PKT_STR
, PKT_BIGNUM
};
122 /* Coroutine mechanics for the sillier bits of the code */
123 #define crBegin1 static int crLine = 0;
124 #define crBegin2 switch(crLine) { case 0:;
125 #define crBegin crBegin1; crBegin2;
126 #define crFinish(z) } crLine = 0; return (z)
127 #define crFinishV } crLine = 0; return
128 #define crReturn(z) \
130 crLine=__LINE__; return (z); case __LINE__:;\
134 crLine=__LINE__; return; case __LINE__:;\
136 #define crStop(z) do{ crLine = 0; return (z); }while(0)
137 #define crStopV do{ crLine = 0; return; }while(0)
138 #define crWaitUntil(c) do { crReturn(0); } while (!(c))
139 #define crWaitUntilV(c) do { crReturnV; } while (!(c))
141 extern struct ssh_cipher ssh_3des
;
142 extern struct ssh_cipher ssh_3des_ssh2
;
143 extern struct ssh_cipher ssh_des
;
144 extern struct ssh_cipher ssh_blowfish
;
146 /* for ssh 2; we miss out single-DES because it isn't supported */
147 struct ssh_cipher
*ciphers
[] = { &ssh_3des_ssh2
, &ssh_blowfish
};
149 extern struct ssh_kex ssh_diffiehellman
;
150 struct ssh_kex
*kex_algs
[] = { &ssh_diffiehellman
};
152 extern struct ssh_hostkey ssh_dss
;
153 struct ssh_hostkey
*hostkey_algs
[] = { &ssh_dss
};
155 extern struct ssh_mac ssh_sha1
;
157 static SHA_State exhash
;
159 static void nullmac_key(unsigned char *key
) { }
160 static void nullmac_generate(unsigned char *blk
, int len
, unsigned long seq
) { }
161 static int nullmac_verify(unsigned char *blk
, int len
, unsigned long seq
) { return 1; }
162 struct ssh_mac ssh_mac_none
= {
163 nullmac_key
, nullmac_key
, nullmac_generate
, nullmac_verify
, "none", 0
165 struct ssh_mac
*macs
[] = { &ssh_sha1
, &ssh_mac_none
};
167 struct ssh_compress ssh_comp_none
= {
170 struct ssh_compress
*compressions
[] = { &ssh_comp_none
};
172 static SOCKET s
= INVALID_SOCKET
;
174 static unsigned char session_key
[32];
175 static struct ssh_cipher
*cipher
= NULL
;
176 static struct ssh_cipher
*cscipher
= NULL
;
177 static struct ssh_cipher
*sccipher
= NULL
;
178 static struct ssh_mac
*csmac
= NULL
;
179 static struct ssh_mac
*scmac
= NULL
;
180 static struct ssh_compress
*cscomp
= NULL
;
181 static struct ssh_compress
*sccomp
= NULL
;
182 static struct ssh_kex
*kex
= NULL
;
183 static struct ssh_hostkey
*hostkey
= NULL
;
184 int (*ssh_get_password
)(const char *prompt
, char *str
, int maxlen
) = NULL
;
186 static char *savedhost
;
187 static int ssh_send_ok
;
190 * 2-3-4 tree storing channels.
193 int remoteid
, localid
;
197 struct ssh_agent_channel
{
198 unsigned char *message
;
199 unsigned char msglen
[4];
200 int lensofar
, totallen
;
204 static tree234
*ssh_channels
; /* indexed by local id */
205 static int ssh_channelcmp(void *av
, void *bv
) {
206 struct ssh_channel
*a
= (struct ssh_channel
*)av
;
207 struct ssh_channel
*b
= (struct ssh_channel
*)bv
;
208 if (a
->localid
< b
->localid
) return -1;
209 if (a
->localid
> b
->localid
) return +1;
212 static int ssh_channelfind(void *av
, void *bv
) {
214 struct ssh_channel
*b
= (struct ssh_channel
*)bv
;
215 if (*a
< b
->localid
) return -1;
216 if (*a
> b
->localid
) return +1;
221 SSH_STATE_BEFORE_SIZE
,
225 } ssh_state
= SSH_STATE_BEFORE_SIZE
;
227 static int size_needed
= FALSE
;
229 static void s_write (char *buf
, int len
) {
231 int i
= send (s
, buf
, len
, 0);
234 fatalbox("Lost connection while sending");
240 static int s_read (char *buf
, int len
) {
243 int i
= recv (s
, buf
, len
, 0);
246 len
-= i
, buf
+= i
, ret
+= i
;
253 static void c_write (char *buf
, int len
) {
254 if (!(flags
& FLAG_CONNECTION
)) {
256 for (i
= 0; i
< len
; i
++)
258 fputc(buf
[i
], stderr
);
274 static struct Packet pktin
= { 0, 0, NULL
, NULL
, 0 };
275 static struct Packet pktout
= { 0, 0, NULL
, NULL
, 0 };
277 static int ssh_version
;
278 static void (*ssh_protocol
)(unsigned char *in
, int inlen
, int ispkt
);
279 static void ssh1_protocol(unsigned char *in
, int inlen
, int ispkt
);
280 static void ssh2_protocol(unsigned char *in
, int inlen
, int ispkt
);
281 static void ssh_size(void);
283 static int (*s_rdpkt
)(unsigned char **data
, int *datalen
);
286 * Collect incoming data in the incoming packet buffer.
287 * Decipher and verify the packet when it is completely read.
288 * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets.
289 * Update the *data and *datalen variables.
290 * Return the additional nr of bytes needed, or 0 when
291 * a complete packet is available.
293 static int ssh1_rdpkt(unsigned char **data
, int *datalen
)
295 static long len
, pad
, biglen
, to_read
;
296 static unsigned long realcrc
, gotcrc
;
297 static unsigned char *p
;
307 for (i
= len
= 0; i
< 4; i
++) {
308 while ((*datalen
) == 0)
310 len
= (len
<< 8) + **data
;
311 (*data
)++, (*datalen
)--;
315 if (len
== 0x52656d6f) { /* "Remo"te server has closed ... */
316 len
= 0x300; /* big enough to carry to end */
322 pktin
.length
= len
- 5;
324 if (pktin
.maxlen
< biglen
) {
325 pktin
.maxlen
= biglen
;
326 pktin
.data
= (pktin
.data
== NULL ?
malloc(biglen
+APIEXTRA
) :
327 realloc(pktin
.data
, biglen
+APIEXTRA
));
329 fatalbox("Out of memory");
334 while (to_read
> 0) {
337 while ((*datalen
) == 0)
339 if (chunk
> (*datalen
))
341 memcpy(p
, *data
, chunk
);
349 cipher
->decrypt(pktin
.data
, biglen
);
351 pktin
.type
= pktin
.data
[pad
];
352 pktin
.body
= pktin
.data
+ pad
+ 1;
354 realcrc
= crc32(pktin
.data
, biglen
-4);
355 gotcrc
= GET_32BIT(pktin
.data
+biglen
-4);
356 if (gotcrc
!= realcrc
) {
357 fatalbox("Incorrect CRC received on packet");
360 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
361 pktin
.type
== SSH1_SMSG_STDERR_DATA
||
362 pktin
.type
== SSH1_MSG_DEBUG
||
363 pktin
.type
== SSH1_SMSG_AUTH_TIS_CHALLENGE
||
364 pktin
.type
== SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
365 long strlen
= GET_32BIT(pktin
.body
);
366 if (strlen
+ 4 != pktin
.length
)
367 fatalbox("Received data packet with bogus string length");
370 if (pktin
.type
== SSH1_MSG_DEBUG
) {
371 /* log debug message */
373 int strlen
= GET_32BIT(pktin
.body
);
374 strcpy(buf
, "Remote: ");
375 if (strlen
> 70) strlen
= 70;
376 memcpy(buf
+8, pktin
.body
+4, strlen
);
377 buf
[8+strlen
] = '\0';
380 } else if (pktin
.type
== SSH1_MSG_IGNORE
) {
388 static int ssh2_rdpkt(unsigned char **data
, int *datalen
)
390 static long len
, pad
, payload
, packetlen
, maclen
;
392 static int cipherblk
;
393 static unsigned long incoming_sequence
= 0;
403 cipherblk
= cipher
->blksize
;
409 if (pktin
.maxlen
< cipherblk
) {
410 pktin
.maxlen
= cipherblk
;
411 pktin
.data
= (pktin
.data
== NULL ?
malloc(cipherblk
+APIEXTRA
) :
412 realloc(pktin
.data
, cipherblk
+APIEXTRA
));
414 fatalbox("Out of memory");
418 * Acquire and decrypt the first block of the packet. This will
419 * contain the length and padding details.
421 for (i
= len
= 0; i
< cipherblk
; i
++) {
422 while ((*datalen
) == 0)
423 crReturn(cipherblk
-i
);
424 pktin
.data
[i
] = *(*data
)++;
428 if (!memcmp(pktin
.data
, "Remo", 4)) {/* "Remo"te server has closed ... */
433 sccipher
->decrypt(pktin
.data
, cipherblk
);
436 * Now get the length and padding figures.
438 len
= GET_32BIT(pktin
.data
);
442 * This enables us to deduce the payload length.
444 payload
= len
- pad
- 1;
446 pktin
.length
= payload
+ 5;
449 * So now we can work out the total packet length.
452 maclen
= scmac ? scmac
->len
: 0;
455 * Adjust memory allocation if packet is too big.
457 if (pktin
.maxlen
< packetlen
) {
458 pktin
.maxlen
= packetlen
;
459 pktin
.data
= (pktin
.data
== NULL ?
malloc(packetlen
+APIEXTRA
) :
460 realloc(pktin
.data
, packetlen
+APIEXTRA
));
462 fatalbox("Out of memory");
466 * Read and decrypt the remainder of the packet.
468 for (i
= cipherblk
; i
< packetlen
+ maclen
; i
++) {
469 while ((*datalen
) == 0)
470 crReturn(packetlen
+ maclen
- i
);
471 pktin
.data
[i
] = *(*data
)++;
474 /* Decrypt everything _except_ the MAC. */
476 sccipher
->decrypt(pktin
.data
+ cipherblk
, packetlen
- cipherblk
);
479 debug(("Got packet len=%d pad=%d\r\n", len
, pad
));
480 for (i
= 0; i
< packetlen
; i
++)
481 debug((" %02x", (unsigned char)pktin
.data
[i
]));
488 if (scmac
&& !scmac
->verify(pktin
.data
, len
+4, incoming_sequence
))
489 fatalbox("Incorrect MAC received on packet");
490 incoming_sequence
++; /* whether or not we MACed */
493 pktin
.type
= pktin
.data
[5];
495 if (pktin
.type
== SSH2_MSG_IGNORE
|| pktin
.type
== SSH2_MSG_DEBUG
)
496 goto next_packet
; /* FIXME: print DEBUG message */
501 static void ssh_gotdata(unsigned char *data
, int datalen
)
503 while (datalen
> 0) {
504 if ( s_rdpkt(&data
, &datalen
) == 0 ) {
505 ssh_protocol(NULL
, 0, 1);
506 if (ssh_state
== SSH_STATE_CLOSED
) {
514 static void s_wrpkt_start(int type
, int len
) {
517 len
+= 5; /* type and CRC */
521 pktout
.length
= len
-5;
522 if (pktout
.maxlen
< biglen
) {
523 pktout
.maxlen
= biglen
;
525 /* Allocate enough buffer space for extra block
526 * for MS CryptEncrypt() */
527 pktout
.data
= (pktout
.data
== NULL ?
malloc(biglen
+12) :
528 realloc(pktout
.data
, biglen
+12));
530 pktout
.data
= (pktout
.data
== NULL ?
malloc(biglen
+4) :
531 realloc(pktout
.data
, biglen
+4));
534 fatalbox("Out of memory");
538 pktout
.body
= pktout
.data
+4+pad
+1;
541 static void s_wrpkt(void) {
542 int pad
, len
, biglen
, i
;
545 len
= pktout
.length
+ 5; /* type and CRC */
549 pktout
.body
[-1] = pktout
.type
;
550 for (i
=0; i
<pad
; i
++)
551 pktout
.data
[i
+4] = random_byte();
552 crc
= crc32(pktout
.data
+4, biglen
-4);
553 PUT_32BIT(pktout
.data
+biglen
, crc
);
554 PUT_32BIT(pktout
.data
, len
);
557 cipher
->encrypt(pktout
.data
+4, biglen
);
559 s_write(pktout
.data
, biglen
+4);
563 * Construct a packet with the specified contents and
564 * send it to the server.
566 static void send_packet(int pkttype
, ...)
569 unsigned char *p
, *argp
, argchar
;
570 unsigned long argint
;
571 int pktlen
, argtype
, arglen
;
575 va_start(args
, pkttype
);
576 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
579 (void) va_arg(args
, int);
583 (void) va_arg(args
, char);
587 (void) va_arg(args
, unsigned char *);
588 arglen
= va_arg(args
, int);
592 argp
= va_arg(args
, unsigned char *);
593 arglen
= strlen(argp
);
594 pktlen
+= 4 + arglen
;
597 bn
= va_arg(args
, Bignum
);
598 pktlen
+= ssh1_bignum_length(bn
);
606 s_wrpkt_start(pkttype
, pktlen
);
609 va_start(args
, pkttype
);
610 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
613 argint
= va_arg(args
, int);
614 PUT_32BIT(p
, argint
);
618 argchar
= va_arg(args
, unsigned char);
623 argp
= va_arg(args
, unsigned char *);
624 arglen
= va_arg(args
, int);
625 memcpy(p
, argp
, arglen
);
629 argp
= va_arg(args
, unsigned char *);
630 arglen
= strlen(argp
);
631 PUT_32BIT(p
, arglen
);
632 memcpy(p
+ 4, argp
, arglen
);
636 bn
= va_arg(args
, Bignum
);
637 p
+= ssh1_write_bignum(p
, bn
);
648 * Connect to specified host and port.
649 * Returns an error message, or NULL on success.
650 * Also places the canonical host name into `realhost'.
652 static char *connect_to_host(char *host
, int port
, char **realhost
)
662 savedhost
= malloc(1+strlen(host
));
664 fatalbox("Out of memory");
665 strcpy(savedhost
, host
);
668 port
= 22; /* default ssh port */
680 if ( (a
= inet_addr(host
)) == (unsigned long) INADDR_NONE
) {
681 if ( (h
= gethostbyname(host
)) == NULL
)
682 switch (WSAGetLastError()) {
683 case WSAENETDOWN
: return "Network is down";
684 case WSAHOST_NOT_FOUND
: case WSANO_DATA
:
685 return "Host does not exist";
686 case WSATRY_AGAIN
: return "Host not found";
687 default: return "gethostbyname: unknown error";
689 memcpy (&a
, h
->h_addr
, sizeof(a
));
690 *realhost
= h
->h_name
;
701 s
= socket(AF_INET
, SOCK_STREAM
, 0);
702 if (s
== INVALID_SOCKET
)
703 switch (WSAGetLastError()) {
704 case WSAENETDOWN
: return "Network is down";
705 case WSAEAFNOSUPPORT
: return "TCP/IP support not present";
706 default: return "socket(): unknown error";
710 * Bind to local address.
712 addr
.sin_family
= AF_INET
;
713 addr
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
714 addr
.sin_port
= htons(0);
715 if (bind (s
, (struct sockaddr
*)&addr
, sizeof(addr
)) == SOCKET_ERROR
)
716 switch (WSAGetLastError()) {
717 case WSAENETDOWN
: return "Network is down";
718 default: return "bind(): unknown error";
722 * Connect to remote address.
724 addr
.sin_addr
.s_addr
= htonl(a
);
725 addr
.sin_port
= htons((short)port
);
726 if (connect (s
, (struct sockaddr
*)&addr
, sizeof(addr
)) == SOCKET_ERROR
)
727 switch (WSAGetLastError()) {
728 case WSAENETDOWN
: return "Network is down";
729 case WSAECONNREFUSED
: return "Connection refused";
730 case WSAENETUNREACH
: return "Network is unreachable";
731 case WSAEHOSTUNREACH
: return "No route to host";
732 default: return "connect(): unknown error";
736 send(s
, "connect ", 8, 0);
737 send(s
, FWhost
, strlen(FWhost
), 0);
740 sprintf(buf
, " %d\n", FWport
);
741 send (s
, buf
, strlen(buf
), 0);
748 static int ssh_versioncmp(char *a
, char *b
) {
750 unsigned long av
, bv
;
752 av
= strtoul(a
, &ae
, 10);
753 bv
= strtoul(b
, &be
, 10);
754 if (av
!= bv
) return (av
< bv ?
-1 : +1);
755 if (*ae
== '.') ae
++;
756 if (*be
== '.') be
++;
757 av
= strtoul(ae
, &ae
, 10);
758 bv
= strtoul(be
, &be
, 10);
759 if (av
!= bv
) return (av
< bv ?
-1 : +1);
765 * Utility routine for putting an SSH-protocol `string' into a SHA
769 void sha_string(SHA_State
*s
, void *str
, int len
) {
770 unsigned char lenblk
[4];
771 PUT_32BIT(lenblk
, len
);
772 SHA_Bytes(s
, lenblk
, 4);
773 SHA_Bytes(s
, str
, len
);
777 * SSH2 packet construction functions.
779 void ssh2_pkt_adddata(void *data
, int len
) {
780 pktout
.length
+= len
;
781 if (pktout
.maxlen
< pktout
.length
) {
782 pktout
.maxlen
= pktout
.length
+ 256;
783 pktout
.data
= (pktout
.data
== NULL ?
malloc(pktout
.maxlen
+APIEXTRA
) :
784 realloc(pktout
.data
, pktout
.maxlen
+APIEXTRA
));
786 fatalbox("Out of memory");
788 memcpy(pktout
.data
+pktout
.length
-len
, data
, len
);
790 void ssh2_pkt_addbyte(unsigned char byte
) {
791 ssh2_pkt_adddata(&byte
, 1);
793 void ssh2_pkt_init(int pkt_type
) {
795 ssh2_pkt_addbyte((unsigned char)pkt_type
);
797 void ssh2_pkt_addbool(unsigned char value
) {
798 ssh2_pkt_adddata(&value
, 1);
800 void ssh2_pkt_adduint32(unsigned long value
) {
803 ssh2_pkt_adddata(x
, 4);
805 void ssh2_pkt_addstring_start(void) {
806 ssh2_pkt_adduint32(0);
807 pktout
.savedpos
= pktout
.length
;
809 void ssh2_pkt_addstring_str(char *data
) {
810 ssh2_pkt_adddata(data
, strlen(data
));
811 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
812 pktout
.length
- pktout
.savedpos
);
814 void ssh2_pkt_addstring_data(char *data
, int len
) {
815 ssh2_pkt_adddata(data
, len
);
816 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
817 pktout
.length
- pktout
.savedpos
);
819 void ssh2_pkt_addstring(char *data
) {
820 ssh2_pkt_addstring_start();
821 ssh2_pkt_addstring_str(data
);
823 char *ssh2_mpint_fmt(Bignum b
, int *len
) {
826 p
= malloc(n
* 2 + 1);
828 fatalbox("out of memory");
830 for (i
= 0; i
< n
; i
++) {
831 p
[i
*2+1] = (b
[n
-i
] >> 8) & 0xFF;
832 p
[i
*2+2] = (b
[n
-i
] ) & 0xFF;
835 while (p
[i
] == 0 && (p
[i
+1] & 0x80) == 0)
837 memmove(p
, p
+i
, n
*2+1-i
);
841 void ssh2_pkt_addmp(Bignum b
) {
844 p
= ssh2_mpint_fmt(b
, &len
);
845 ssh2_pkt_addstring_start();
846 ssh2_pkt_addstring_data(p
, len
);
849 void ssh2_pkt_send(void) {
850 int cipherblk
, maclen
, padding
, i
;
851 static unsigned long outgoing_sequence
= 0;
854 * Add padding. At least four bytes, and must also bring total
855 * length (minus MAC) up to a multiple of the block size.
857 cipherblk
= cipher ? cipher
->blksize
: 8; /* block size */
858 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
860 padding
+= (cipherblk
- (pktout
.length
+ padding
) % cipherblk
) % cipherblk
;
861 pktout
.data
[4] = padding
;
862 for (i
= 0; i
< padding
; i
++)
863 pktout
.data
[pktout
.length
+ i
] = random_byte();
864 PUT_32BIT(pktout
.data
, pktout
.length
+ padding
- 4);
866 csmac
->generate(pktout
.data
, pktout
.length
+ padding
,
868 outgoing_sequence
++; /* whether or not we MACed */
871 debug(("Sending packet len=%d\r\n", pktout
.length
+padding
));
872 for (i
= 0; i
< pktout
.length
+padding
; i
++)
873 debug((" %02x", (unsigned char)pktout
.data
[i
]));
878 cscipher
->encrypt(pktout
.data
, pktout
.length
+ padding
);
879 maclen
= csmac ? csmac
->len
: 0;
881 s_write(pktout
.data
, pktout
.length
+ padding
+ maclen
);
885 void bndebug(char *string
, Bignum b
) {
888 p
= ssh2_mpint_fmt(b
, &len
);
889 debug(("%s", string
));
890 for (i
= 0; i
< len
; i
++)
891 debug((" %02x", p
[i
]));
897 void sha_mpint(SHA_State
*s
, Bignum b
) {
900 p
= ssh2_mpint_fmt(b
, &len
);
901 sha_string(s
, p
, len
);
906 * SSH2 packet decode functions.
908 unsigned long ssh2_pkt_getuint32(void) {
910 if (pktin
.length
- pktin
.savedpos
< 4)
911 return 0; /* arrgh, no way to decline (FIXME?) */
912 value
= GET_32BIT(pktin
.data
+pktin
.savedpos
);
916 void ssh2_pkt_getstring(char **p
, int *length
) {
918 if (pktin
.length
- pktin
.savedpos
< 4)
920 *length
= GET_32BIT(pktin
.data
+pktin
.savedpos
);
922 if (pktin
.length
- pktin
.savedpos
< *length
)
924 *p
= pktin
.data
+pktin
.savedpos
;
925 pktin
.savedpos
+= *length
;
927 Bignum
ssh2_pkt_getmp(void) {
932 ssh2_pkt_getstring(&p
, &length
);
936 fatalbox("internal error: Can't handle negative mpints");
937 b
= newbn((length
+1)/2);
938 for (i
= 0; i
< length
; i
++) {
941 b
[j
/2+1] |= ((unsigned char)p
[i
]) << 8;
943 b
[j
/2+1] |= ((unsigned char)p
[i
]);
948 static int do_ssh_init(void) {
952 char vlog
[sizeof(vstring
)+20];
957 while (s_read(&c
, 1) == 1) {
958 if (c
== 'S' && i
< 2) i
++;
959 else if (c
== 'S' && i
== 2) i
= 2;
960 else if (c
== 'H' && i
== 2) break;
964 if (s_read(&c
,1) != 1 || c
!= 'S') return 0;
965 if (s_read(&c
,1) != 1 || c
!= 'S') return 0;
966 if (s_read(&c
,1) != 1 || c
!= 'H') return 0;
968 strcpy(vstring
, "SSH-");
970 if (s_read(&c
,1) != 1 || c
!= '-') return 0;
973 if (s_read(&c
,1) != 1)
975 if (vsp
< vstring
+sizeof(vstring
)-1)
981 } else if (i
< sizeof(version
)-1)
989 sprintf(vlog
, "Server version: %s", vstring
);
990 vlog
[strcspn(vlog
, "\r\n")] = '\0';
994 * Server version "1.99" means we can choose whether we use v1
995 * or v2 protocol. Choice is based on cfg.sshprot.
997 if (ssh_versioncmp(version
, cfg
.sshprot
== 1 ?
"2.0" : "1.99") >= 0) {
999 * This is a v2 server. Begin v2 protocol.
1001 char *verstring
= "SSH-2.0-PuTTY";
1004 * Hash our version string and their version string.
1006 sha_string(&exhash
, verstring
, strlen(verstring
));
1007 sha_string(&exhash
, vstring
, strcspn(vstring
, "\r\n"));
1008 sprintf(vstring
, "%s\n", verstring
);
1009 sprintf(vlog
, "We claim version: %s", verstring
);
1011 logevent("Using SSH protocol version 2");
1012 s_write(vstring
, strlen(vstring
));
1013 ssh_protocol
= ssh2_protocol
;
1015 s_rdpkt
= ssh2_rdpkt
;
1018 * This is a v1 server. Begin v1 protocol.
1020 sprintf(vstring
, "SSH-%s-PuTTY\n",
1021 (ssh_versioncmp(version
, "1.5") <= 0 ? version
: "1.5"));
1022 sprintf(vlog
, "We claim version: %s", vstring
);
1023 vlog
[strcspn(vlog
, "\r\n")] = '\0';
1025 logevent("Using SSH protocol version 1");
1026 s_write(vstring
, strlen(vstring
));
1027 ssh_protocol
= ssh1_protocol
;
1029 s_rdpkt
= ssh1_rdpkt
;
1036 * Handle the key exchange and user authentication phases.
1038 static int do_ssh1_login(unsigned char *in
, int inlen
, int ispkt
)
1041 unsigned char *rsabuf
, *keystr1
, *keystr2
;
1042 unsigned char cookie
[8];
1043 struct RSAKey servkey
, hostkey
;
1044 struct MD5Context md5c
;
1045 static unsigned long supported_ciphers_mask
, supported_auths_mask
;
1046 static int tried_publickey
;
1047 static unsigned char session_id
[16];
1052 if (!ispkt
) crWaitUntil(ispkt
);
1054 if (pktin
.type
!= SSH1_SMSG_PUBLIC_KEY
)
1055 fatalbox("Public key packet not received");
1057 logevent("Received public keys");
1059 memcpy(cookie
, pktin
.body
, 8);
1061 i
= makekey(pktin
.body
+8, &servkey
, &keystr1
, 0);
1062 j
= makekey(pktin
.body
+8+i
, &hostkey
, &keystr2
, 0);
1065 * Hash the host key and print the hash in the log box. Just as
1066 * a last resort in case the registry's host key checking is
1067 * compromised, we'll allow the user some ability to verify
1071 MD5Update(&md5c
, keystr2
, hostkey
.bytes
);
1072 MD5Final(session_id
, &md5c
);
1076 logevent("Host key MD5 is:");
1077 strcpy(logmsg
, " ");
1078 for (i
= 0; i
< 16; i
++)
1079 sprintf(logmsg
+strlen(logmsg
), "%02x", session_id
[i
]);
1083 supported_ciphers_mask
= GET_32BIT(pktin
.body
+12+i
+j
);
1084 supported_auths_mask
= GET_32BIT(pktin
.body
+16+i
+j
);
1087 MD5Update(&md5c
, keystr2
, hostkey
.bytes
);
1088 MD5Update(&md5c
, keystr1
, servkey
.bytes
);
1089 MD5Update(&md5c
, pktin
.body
, 8);
1090 MD5Final(session_id
, &md5c
);
1092 for (i
=0; i
<32; i
++)
1093 session_key
[i
] = random_byte();
1095 len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
1097 rsabuf
= malloc(len
);
1099 fatalbox("Out of memory");
1102 * Verify the host key.
1106 * First format the key into a string.
1108 int len
= rsastr_len(&hostkey
);
1109 char *keystr
= malloc(len
);
1111 fatalbox("Out of memory");
1112 rsastr_fmt(keystr
, &hostkey
);
1113 verify_ssh_host_key(savedhost
, keystr
);
1117 for (i
=0; i
<32; i
++) {
1118 rsabuf
[i
] = session_key
[i
];
1120 rsabuf
[i
] ^= session_id
[i
];
1123 if (hostkey
.bytes
> servkey
.bytes
) {
1124 rsaencrypt(rsabuf
, 32, &servkey
);
1125 rsaencrypt(rsabuf
, servkey
.bytes
, &hostkey
);
1127 rsaencrypt(rsabuf
, 32, &hostkey
);
1128 rsaencrypt(rsabuf
, hostkey
.bytes
, &servkey
);
1131 logevent("Encrypted session key");
1133 cipher_type
= cfg
.cipher
== CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH
:
1134 cfg
.cipher
== CIPHER_DES ? SSH_CIPHER_DES
:
1136 if ((supported_ciphers_mask
& (1 << cipher_type
)) == 0) {
1137 c_write("Selected cipher not supported, falling back to 3DES\r\n", 53);
1138 cipher_type
= SSH_CIPHER_3DES
;
1140 switch (cipher_type
) {
1141 case SSH_CIPHER_3DES
: logevent("Using 3DES encryption"); break;
1142 case SSH_CIPHER_DES
: logevent("Using single-DES encryption"); break;
1143 case SSH_CIPHER_BLOWFISH
: logevent("Using Blowfish encryption"); break;
1146 send_packet(SSH1_CMSG_SESSION_KEY
,
1147 PKT_CHAR
, cipher_type
,
1148 PKT_DATA
, cookie
, 8,
1149 PKT_CHAR
, (len
*8) >> 8, PKT_CHAR
, (len
*8) & 0xFF,
1150 PKT_DATA
, rsabuf
, len
,
1154 logevent("Trying to enable encryption...");
1158 cipher
= cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish
:
1159 cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
1161 cipher
->sesskey(session_key
);
1165 if (pktin
.type
!= SSH1_SMSG_SUCCESS
)
1166 fatalbox("Encryption not successfully enabled");
1168 logevent("Successfully started encryption");
1172 static char username
[100];
1175 if ((flags
& FLAG_CONNECTION
) && !*cfg
.username
) {
1176 c_write("login as: ", 10);
1178 crWaitUntil(!ispkt
);
1179 while (inlen
--) switch (c
= *in
++) {
1186 c_write("\b \b", 3);
1192 c_write("\b \b", 3);
1201 if (((c
>= ' ' && c
<= '~') ||
1202 ((unsigned char)c
>= 160)) && pos
< 40) {
1203 username
[pos
++] = c
;
1210 username
[strcspn(username
, "\n\r")] = '\0';
1213 strncpy(username
, cfg
.username
, 99);
1214 username
[99] = '\0';
1215 if (flags
& FLAG_VERBOSE
) {
1216 sprintf(stuff
, "Sent username \"%s\".\r\n", username
);
1217 c_write(stuff
, strlen(stuff
));
1221 send_packet(SSH1_CMSG_USER
, PKT_STR
, username
, PKT_END
);
1223 char userlog
[20+sizeof(username
)];
1224 sprintf(userlog
, "Sent username \"%s\"", username
);
1231 tried_publickey
= 0;
1233 while (pktin
.type
== SSH1_SMSG_FAILURE
) {
1234 static char password
[100];
1237 static int pwpkt_type
;
1239 * Show password prompt, having first obtained it via a TIS
1240 * or CryptoCard exchange if we're doing TIS or CryptoCard
1243 pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
1244 if (agent_exists()) {
1246 * Attempt RSA authentication using Pageant.
1248 static unsigned char request
[5], *response
, *p
;
1249 static int responselen
;
1250 static int i
, nkeys
;
1251 static int authed
= FALSE
;
1254 logevent("Pageant is running. Requesting keys.");
1256 /* Request the keys held by the agent. */
1257 PUT_32BIT(request
, 1);
1258 request
[4] = SSH_AGENTC_REQUEST_RSA_IDENTITIES
;
1259 agent_query(request
, 5, &r
, &responselen
);
1260 response
= (unsigned char *)r
;
1263 nkeys
= GET_32BIT(p
); p
+= 4;
1264 { char buf
[64]; sprintf(buf
, "Pageant has %d keys", nkeys
);
1266 for (i
= 0; i
< nkeys
; i
++) {
1267 static struct RSAKey key
;
1268 static Bignum challenge
;
1269 static char *commentp
;
1270 static int commentlen
;
1272 { char buf
[64]; sprintf(buf
, "Trying Pageant key #%d", i
);
1275 p
+= ssh1_read_bignum(p
, &key
.exponent
);
1276 p
+= ssh1_read_bignum(p
, &key
.modulus
);
1277 commentlen
= GET_32BIT(p
); p
+= 4;
1278 commentp
= p
; p
+= commentlen
;
1279 send_packet(SSH1_CMSG_AUTH_RSA
,
1280 PKT_BIGNUM
, key
.modulus
, PKT_END
);
1282 if (pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
1283 logevent("Key refused");
1286 logevent("Received RSA challenge");
1287 ssh1_read_bignum(pktin
.body
, &challenge
);
1289 char *agentreq
, *q
, *ret
;
1291 len
= 1 + 4; /* message type, bit count */
1292 len
+= ssh1_bignum_length(key
.exponent
);
1293 len
+= ssh1_bignum_length(key
.modulus
);
1294 len
+= ssh1_bignum_length(challenge
);
1295 len
+= 16; /* session id */
1296 len
+= 4; /* response format */
1297 agentreq
= malloc(4 + len
);
1298 PUT_32BIT(agentreq
, len
);
1300 *q
++ = SSH_AGENTC_RSA_CHALLENGE
;
1301 PUT_32BIT(q
, ssh1_bignum_bitcount(key
.modulus
));
1303 q
+= ssh1_write_bignum(q
, key
.exponent
);
1304 q
+= ssh1_write_bignum(q
, key
.modulus
);
1305 q
+= ssh1_write_bignum(q
, challenge
);
1306 memcpy(q
, session_id
, 16); q
+= 16;
1307 PUT_32BIT(q
, 1); /* response format */
1308 agent_query(agentreq
, len
+4, &ret
, &retlen
);
1311 if (ret
[4] == SSH_AGENT_RSA_RESPONSE
) {
1312 logevent("Sending Pageant's response");
1313 send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE
,
1314 PKT_DATA
, ret
+5, 16, PKT_END
);
1317 if (pktin
.type
== SSH1_SMSG_SUCCESS
) {
1318 logevent("Pageant's response accepted");
1319 c_write("Authenticated using RSA key \"",
1321 c_write(commentp
, commentlen
);
1322 c_write("\" from agent\r\n", 14);
1325 logevent("Pageant's response not accepted");
1327 logevent("Pageant failed to answer challenge");
1331 logevent("No reply received from Pageant");
1334 freebn(key
.exponent
);
1335 freebn(key
.modulus
);
1344 if (*cfg
.keyfile
&& !tried_publickey
)
1345 pwpkt_type
= SSH1_CMSG_AUTH_RSA
;
1347 if (pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
&& !FLAG_WINDOWED
) {
1349 sprintf(prompt
, "%s@%s's password: ", cfg
.username
, savedhost
);
1350 if (!ssh_get_password(prompt
, password
, sizeof(password
))) {
1352 * get_password failed to get a password (for
1353 * example because one was supplied on the command
1354 * line which has already failed to work).
1357 logevent("No more passwords to try");
1358 ssh_state
= SSH_STATE_CLOSED
;
1363 if (pktin
.type
== SSH1_SMSG_FAILURE
&&
1365 (supported_auths_mask
& (1<<SSH1_AUTH_TIS
))) {
1366 pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
1367 logevent("Requested TIS authentication");
1368 send_packet(SSH1_CMSG_AUTH_TIS
, PKT_END
);
1370 if (pktin
.type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
1371 logevent("TIS authentication declined");
1372 c_write("TIS authentication refused.\r\n", 29);
1374 int challengelen
= ((pktin
.body
[0] << 24) |
1375 (pktin
.body
[1] << 16) |
1376 (pktin
.body
[2] << 8) |
1378 logevent("Received TIS challenge");
1379 c_write(pktin
.body
+4, challengelen
);
1382 if (pktin
.type
== SSH1_SMSG_FAILURE
&&
1384 (supported_auths_mask
& (1<<SSH1_AUTH_CCARD
))) {
1385 pwpkt_type
= SSH1_CMSG_AUTH_CCARD_RESPONSE
;
1386 logevent("Requested CryptoCard authentication");
1387 send_packet(SSH1_CMSG_AUTH_CCARD
, PKT_END
);
1389 if (pktin
.type
!= SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
1390 logevent("CryptoCard authentication declined");
1391 c_write("CryptoCard authentication refused.\r\n", 29);
1393 int challengelen
= ((pktin
.body
[0] << 24) |
1394 (pktin
.body
[1] << 16) |
1395 (pktin
.body
[2] << 8) |
1397 logevent("Received CryptoCard challenge");
1398 c_write(pktin
.body
+4, challengelen
);
1399 c_write("\r\nResponse : ", 13);
1402 if (pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
)
1403 c_write("password: ", 10);
1404 if (pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
1405 if (flags
& FLAG_VERBOSE
)
1406 c_write("Trying public key authentication.\r\n", 35);
1407 if (!rsakey_encrypted(cfg
.keyfile
)) {
1408 if (flags
& FLAG_VERBOSE
)
1409 c_write("No passphrase required.\r\n", 25);
1412 c_write("passphrase: ", 12);
1417 crWaitUntil(!ispkt
);
1418 while (inlen
--) switch (c
= *in
++) {
1435 if (((c
>= ' ' && c
<= '~') ||
1436 ((unsigned char)c
>= 160)) && pos
< sizeof(password
))
1437 password
[pos
++] = c
;
1446 if (pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
1448 * Try public key authentication with the specified
1451 static struct RSAKey pubkey
;
1452 static Bignum challenge
, response
;
1454 static unsigned char buffer
[32];
1456 tried_publickey
= 1;
1457 i
= loadrsakey(cfg
.keyfile
, &pubkey
, password
);
1459 c_write("Couldn't load public key from ", 30);
1460 c_write(cfg
.keyfile
, strlen(cfg
.keyfile
));
1461 c_write(".\r\n", 3);
1462 continue; /* go and try password */
1465 c_write("Wrong passphrase.\r\n", 19);
1466 tried_publickey
= 0;
1467 continue; /* try again */
1471 * Send a public key attempt.
1473 send_packet(SSH1_CMSG_AUTH_RSA
,
1474 PKT_BIGNUM
, pubkey
.modulus
, PKT_END
);
1477 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1478 if (flags
& FLAG_VERBOSE
)
1479 c_write("Server refused our public key.\r\n", 32);
1480 continue; /* go and try password */
1482 if (pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
)
1483 fatalbox("Bizarre response to offer of public key");
1484 ssh1_read_bignum(pktin
.body
, &challenge
);
1485 response
= rsadecrypt(challenge
, &pubkey
);
1486 freebn(pubkey
.private_exponent
); /* burn the evidence */
1488 for (i
= 0; i
< 32; i
+= 2) {
1489 buffer
[i
] = response
[16-i
/2] >> 8;
1490 buffer
[i
+1] = response
[16-i
/2] & 0xFF;
1494 MD5Update(&md5c
, buffer
, 32);
1495 MD5Update(&md5c
, session_id
, 16);
1496 MD5Final(buffer
, &md5c
);
1498 send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE
,
1499 PKT_DATA
, buffer
, 16, PKT_END
);
1502 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1503 if (flags
& FLAG_VERBOSE
)
1504 c_write("Failed to authenticate with our public key.\r\n",
1506 continue; /* go and try password */
1507 } else if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1508 fatalbox("Bizarre response to RSA authentication response");
1511 break; /* we're through! */
1513 send_packet(pwpkt_type
, PKT_STR
, password
, PKT_END
);
1515 logevent("Sent password");
1516 memset(password
, 0, strlen(password
));
1518 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1519 if (flags
& FLAG_VERBOSE
)
1520 c_write("Access denied\r\n", 15);
1521 logevent("Authentication refused");
1522 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1523 logevent("Received disconnect request");
1524 ssh_state
= SSH_STATE_CLOSED
;
1526 } else if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1527 fatalbox("Strange packet received, type %d", pktin
.type
);
1531 logevent("Authentication successful");
1536 static void ssh1_protocol(unsigned char *in
, int inlen
, int ispkt
) {
1541 while (!do_ssh1_login(in
, inlen
, ispkt
)) {
1544 if (ssh_state
== SSH_STATE_CLOSED
)
1547 if (cfg
.agentfwd
&& agent_exists()) {
1548 logevent("Requesting agent forwarding");
1549 send_packet(SSH1_CMSG_AGENT_REQUEST_FORWARDING
, PKT_END
);
1550 do { crReturnV
; } while (!ispkt
);
1551 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1552 fatalbox("Protocol confusion");
1553 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1554 logevent("Agent forwarding refused");
1556 logevent("Agent forwarding enabled");
1560 send_packet(SSH1_CMSG_REQUEST_PTY
,
1561 PKT_STR
, cfg
.termtype
,
1562 PKT_INT
, rows
, PKT_INT
, cols
,
1563 PKT_INT
, 0, PKT_INT
, 0,
1566 ssh_state
= SSH_STATE_INTERMED
;
1567 do { crReturnV
; } while (!ispkt
);
1568 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1569 fatalbox("Protocol confusion");
1570 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1571 c_write("Server refused to allocate pty\r\n", 32);
1573 logevent("Allocated pty");
1576 if (*cfg
.remote_cmd
)
1577 send_packet(SSH1_CMSG_EXEC_CMD
, PKT_STR
, cfg
.remote_cmd
, PKT_END
);
1579 send_packet(SSH1_CMSG_EXEC_SHELL
, PKT_END
);
1580 logevent("Started session");
1582 ssh_state
= SSH_STATE_SESSION
;
1587 ssh_channels
= newtree234(ssh_channelcmp
);
1591 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
1592 pktin
.type
== SSH1_SMSG_STDERR_DATA
) {
1593 long len
= GET_32BIT(pktin
.body
);
1594 c_write(pktin
.body
+4, len
);
1595 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1596 ssh_state
= SSH_STATE_CLOSED
;
1597 logevent("Received disconnect request");
1598 } else if (pktin
.type
== SSH1_SMSG_AGENT_OPEN
) {
1599 /* Remote side is trying to open a channel to talk to our
1600 * agent. Give them back a local channel number. */
1602 struct ssh_channel
*c
;
1604 for (c
= first234(ssh_channels
, &e
); c
; c
= next234(&e
)) {
1606 break; /* found a free number */
1609 c
= malloc(sizeof(struct ssh_channel
));
1610 c
->remoteid
= GET_32BIT(pktin
.body
);
1613 c
->type
= SSH1_SMSG_AGENT_OPEN
; /* identify channel type */
1614 add234(ssh_channels
, c
);
1615 send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
1616 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
1618 } else if (pktin
.type
== SSH1_MSG_CHANNEL_CLOSE
||
1619 pktin
.type
== SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
) {
1620 /* Remote side closes a channel. */
1621 int i
= GET_32BIT(pktin
.body
);
1622 struct ssh_channel
*c
;
1623 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
1626 closetype
= (pktin
.type
== SSH1_MSG_CHANNEL_CLOSE ?
1 : 2);
1627 send_packet(pktin
.type
, PKT_INT
, c
->remoteid
, PKT_END
);
1628 c
->closes
|= closetype
;
1629 if (c
->closes
== 3) {
1630 del234(ssh_channels
, c
);
1634 } else if (pktin
.type
== SSH1_MSG_CHANNEL_DATA
) {
1635 /* Data sent down one of our channels. */
1636 int i
= GET_32BIT(pktin
.body
);
1637 int len
= GET_32BIT(pktin
.body
+4);
1638 unsigned char *p
= pktin
.body
+8;
1639 struct ssh_channel
*c
;
1640 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
1643 case SSH1_SMSG_AGENT_OPEN
:
1644 /* Data for an agent message. Buffer it. */
1646 if (c
->u
.a
.lensofar
< 4) {
1647 int l
= min(4 - c
->u
.a
.lensofar
, len
);
1648 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
, p
, l
);
1649 p
+= l
; len
-= l
; c
->u
.a
.lensofar
+= l
;
1651 if (c
->u
.a
.lensofar
== 4) {
1652 c
->u
.a
.totallen
= 4 + GET_32BIT(c
->u
.a
.msglen
);
1653 c
->u
.a
.message
= malloc(c
->u
.a
.totallen
);
1654 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
1656 if (c
->u
.a
.lensofar
>= 4 && len
> 0) {
1657 int l
= min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
, len
);
1658 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
, p
, l
);
1659 p
+= l
; len
-= l
; c
->u
.a
.lensofar
+= l
;
1661 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
1662 void *reply
, *sentreply
;
1664 agent_query(c
->u
.a
.message
, c
->u
.a
.totallen
,
1669 /* Fake SSH_AGENT_FAILURE. */
1670 sentreply
= "\0\0\0\1\5";
1673 send_packet(SSH1_MSG_CHANNEL_DATA
,
1674 PKT_INT
, c
->remoteid
,
1676 PKT_DATA
, sentreply
, replylen
,
1680 free(c
->u
.a
.message
);
1681 c
->u
.a
.lensofar
= 0;
1687 } else if (pktin
.type
== SSH1_SMSG_SUCCESS
) {
1688 /* may be from EXEC_SHELL on some servers */
1689 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1690 /* may be from EXEC_SHELL on some servers
1691 * if no pty is available or in other odd cases. Ignore */
1692 } else if (pktin
.type
== SSH1_SMSG_EXIT_STATUS
) {
1693 send_packet(SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
1695 fatalbox("Strange packet received: type %d", pktin
.type
);
1698 send_packet(SSH1_CMSG_STDIN_DATA
,
1699 PKT_INT
, inlen
, PKT_DATA
, in
, inlen
, PKT_END
);
1707 * Utility routine for decoding comma-separated strings in KEXINIT.
1709 int in_commasep_string(char *needle
, char *haystack
, int haylen
) {
1710 int needlen
= strlen(needle
);
1713 * Is it at the start of the string?
1715 if (haylen
>= needlen
&& /* haystack is long enough */
1716 !memcmp(needle
, haystack
, needlen
) && /* initial match */
1717 (haylen
== needlen
|| haystack
[needlen
] == ',')
1718 /* either , or EOS follows */
1722 * If not, search for the next comma and resume after that.
1723 * If no comma found, terminate.
1725 while (haylen
> 0 && *haystack
!= ',')
1726 haylen
--, haystack
++;
1729 haylen
--, haystack
++; /* skip over comma itself */
1734 * SSH2 key creation method.
1736 void ssh2_mkkey(Bignum K
, char *H
, char chr
, char *keyspace
) {
1738 /* First 20 bytes. */
1741 SHA_Bytes(&s
, H
, 20);
1742 SHA_Bytes(&s
, &chr
, 1);
1743 SHA_Bytes(&s
, H
, 20);
1744 SHA_Final(&s
, keyspace
);
1745 /* Next 20 bytes. */
1748 SHA_Bytes(&s
, H
, 20);
1749 SHA_Bytes(&s
, keyspace
, 20);
1750 SHA_Final(&s
, keyspace
+20);
1754 * Handle the SSH2 transport layer.
1756 static int do_ssh2_transport(unsigned char *in
, int inlen
, int ispkt
)
1760 static Bignum e
, f
, K
;
1761 static struct ssh_cipher
*cscipher_tobe
= NULL
;
1762 static struct ssh_cipher
*sccipher_tobe
= NULL
;
1763 static struct ssh_mac
*csmac_tobe
= NULL
;
1764 static struct ssh_mac
*scmac_tobe
= NULL
;
1765 static struct ssh_compress
*cscomp_tobe
= NULL
;
1766 static struct ssh_compress
*sccomp_tobe
= NULL
;
1767 static char *hostkeydata
, *sigdata
, *keystr
;
1768 static int hostkeylen
, siglen
;
1769 static unsigned char exchange_hash
[20];
1770 static unsigned char keyspace
[40];
1777 * Construct and send our key exchange packet.
1779 ssh2_pkt_init(SSH2_MSG_KEXINIT
);
1780 for (i
= 0; i
< 16; i
++)
1781 ssh2_pkt_addbyte((unsigned char)random_byte());
1782 /* List key exchange algorithms. */
1783 ssh2_pkt_addstring_start();
1784 for (i
= 0; i
< lenof(kex_algs
); i
++) {
1785 ssh2_pkt_addstring_str(kex_algs
[i
]->name
);
1786 if (i
< lenof(kex_algs
)-1)
1787 ssh2_pkt_addstring_str(",");
1789 /* List server host key algorithms. */
1790 ssh2_pkt_addstring_start();
1791 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
1792 ssh2_pkt_addstring_str(hostkey_algs
[i
]->name
);
1793 if (i
< lenof(hostkey_algs
)-1)
1794 ssh2_pkt_addstring_str(",");
1796 /* List client->server encryption algorithms. */
1797 ssh2_pkt_addstring_start();
1798 for (i
= 0; i
< lenof(ciphers
); i
++) {
1799 ssh2_pkt_addstring_str(ciphers
[i
]->name
);
1800 if (i
< lenof(ciphers
)-1)
1801 ssh2_pkt_addstring_str(",");
1803 /* List server->client encryption algorithms. */
1804 ssh2_pkt_addstring_start();
1805 for (i
= 0; i
< lenof(ciphers
); i
++) {
1806 ssh2_pkt_addstring_str(ciphers
[i
]->name
);
1807 if (i
< lenof(ciphers
)-1)
1808 ssh2_pkt_addstring_str(",");
1810 /* List client->server MAC algorithms. */
1811 ssh2_pkt_addstring_start();
1812 for (i
= 0; i
< lenof(macs
); i
++) {
1813 ssh2_pkt_addstring_str(macs
[i
]->name
);
1814 if (i
< lenof(macs
)-1)
1815 ssh2_pkt_addstring_str(",");
1817 /* List server->client MAC algorithms. */
1818 ssh2_pkt_addstring_start();
1819 for (i
= 0; i
< lenof(macs
); i
++) {
1820 ssh2_pkt_addstring_str(macs
[i
]->name
);
1821 if (i
< lenof(macs
)-1)
1822 ssh2_pkt_addstring_str(",");
1824 /* List client->server compression algorithms. */
1825 ssh2_pkt_addstring_start();
1826 for (i
= 0; i
< lenof(compressions
); i
++) {
1827 ssh2_pkt_addstring_str(compressions
[i
]->name
);
1828 if (i
< lenof(compressions
)-1)
1829 ssh2_pkt_addstring_str(",");
1831 /* List server->client compression algorithms. */
1832 ssh2_pkt_addstring_start();
1833 for (i
= 0; i
< lenof(compressions
); i
++) {
1834 ssh2_pkt_addstring_str(compressions
[i
]->name
);
1835 if (i
< lenof(compressions
)-1)
1836 ssh2_pkt_addstring_str(",");
1838 /* List client->server languages. Empty list. */
1839 ssh2_pkt_addstring_start();
1840 /* List server->client languages. Empty list. */
1841 ssh2_pkt_addstring_start();
1842 /* First KEX packet does _not_ follow, because we're not that brave. */
1843 ssh2_pkt_addbool(FALSE
);
1845 ssh2_pkt_adduint32(0);
1846 sha_string(&exhash
, pktout
.data
+5, pktout
.length
-5);
1849 if (!ispkt
) crWaitUntil(ispkt
);
1850 sha_string(&exhash
, pktin
.data
+5, pktin
.length
-5);
1853 * Now examine the other side's KEXINIT to see what we're up
1856 if (pktin
.type
!= SSH2_MSG_KEXINIT
) {
1857 fatalbox("expected key exchange packet from server");
1859 kex
= NULL
; hostkey
= NULL
; cscipher_tobe
= NULL
; sccipher_tobe
= NULL
;
1860 csmac_tobe
= NULL
; scmac_tobe
= NULL
; cscomp_tobe
= NULL
; sccomp_tobe
= NULL
;
1861 pktin
.savedpos
+= 16; /* skip garbage cookie */
1862 ssh2_pkt_getstring(&str
, &len
); /* key exchange algorithms */
1863 for (i
= 0; i
< lenof(kex_algs
); i
++) {
1864 if (in_commasep_string(kex_algs
[i
]->name
, str
, len
)) {
1869 ssh2_pkt_getstring(&str
, &len
); /* host key algorithms */
1870 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
1871 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
1872 hostkey
= hostkey_algs
[i
];
1876 ssh2_pkt_getstring(&str
, &len
); /* client->server cipher */
1877 for (i
= 0; i
< lenof(ciphers
); i
++) {
1878 if (in_commasep_string(ciphers
[i
]->name
, str
, len
)) {
1879 cscipher_tobe
= ciphers
[i
];
1883 ssh2_pkt_getstring(&str
, &len
); /* server->client cipher */
1884 for (i
= 0; i
< lenof(ciphers
); i
++) {
1885 if (in_commasep_string(ciphers
[i
]->name
, str
, len
)) {
1886 sccipher_tobe
= ciphers
[i
];
1890 ssh2_pkt_getstring(&str
, &len
); /* client->server mac */
1891 for (i
= 0; i
< lenof(macs
); i
++) {
1892 if (in_commasep_string(macs
[i
]->name
, str
, len
)) {
1893 csmac_tobe
= macs
[i
];
1897 ssh2_pkt_getstring(&str
, &len
); /* server->client mac */
1898 for (i
= 0; i
< lenof(macs
); i
++) {
1899 if (in_commasep_string(macs
[i
]->name
, str
, len
)) {
1900 scmac_tobe
= macs
[i
];
1904 ssh2_pkt_getstring(&str
, &len
); /* client->server compression */
1905 for (i
= 0; i
< lenof(compressions
); i
++) {
1906 if (in_commasep_string(compressions
[i
]->name
, str
, len
)) {
1907 cscomp_tobe
= compressions
[i
];
1911 ssh2_pkt_getstring(&str
, &len
); /* server->client compression */
1912 for (i
= 0; i
< lenof(compressions
); i
++) {
1913 if (in_commasep_string(compressions
[i
]->name
, str
, len
)) {
1914 sccomp_tobe
= compressions
[i
];
1920 * Currently we only support Diffie-Hellman and DSS, so let's
1921 * bomb out if those aren't selected.
1923 if (kex
!= &ssh_diffiehellman
|| hostkey
!= &ssh_dss
)
1924 fatalbox("internal fault: chaos in SSH 2 transport layer");
1927 * Now we begin the fun. Generate and send e for Diffie-Hellman.
1930 ssh2_pkt_init(SSH2_MSG_KEXDH_INIT
);
1935 if (pktin
.type
!= SSH2_MSG_KEXDH_REPLY
) {
1936 fatalbox("expected key exchange packet from server");
1938 ssh2_pkt_getstring(&hostkeydata
, &hostkeylen
);
1939 f
= ssh2_pkt_getmp();
1940 ssh2_pkt_getstring(&sigdata
, &siglen
);
1944 sha_string(&exhash
, hostkeydata
, hostkeylen
);
1945 sha_mpint(&exhash
, e
);
1946 sha_mpint(&exhash
, f
);
1947 sha_mpint(&exhash
, K
);
1948 SHA_Final(&exhash
, exchange_hash
);
1951 debug(("Exchange hash is:\r\n"));
1952 for (i
= 0; i
< 20; i
++)
1953 debug((" %02x", exchange_hash
[i
]));
1957 hostkey
->setkey(hostkeydata
, hostkeylen
);
1958 if (!hostkey
->verifysig(sigdata
, siglen
, exchange_hash
, 20))
1959 fatalbox("Server failed host key check");
1962 * Expect SSH2_MSG_NEWKEYS from server.
1965 if (pktin
.type
!= SSH2_MSG_NEWKEYS
)
1966 fatalbox("expected new-keys packet from server");
1969 * Authenticate remote host: verify host key. (We've already
1970 * checked the signature of the exchange hash.)
1972 keystr
= hostkey
->fmtkey();
1973 verify_ssh_host_key(savedhost
, keystr
);
1977 * Send SSH2_MSG_NEWKEYS.
1979 ssh2_pkt_init(SSH2_MSG_NEWKEYS
);
1983 * Create and initialise session keys.
1985 cscipher
= cscipher_tobe
;
1986 sccipher
= sccipher_tobe
;
1989 cscomp
= cscomp_tobe
;
1990 sccomp
= sccomp_tobe
;
1992 * Set IVs after keys.
1994 ssh2_mkkey(K
, exchange_hash
, 'C', keyspace
); cscipher
->setcskey(keyspace
);
1995 ssh2_mkkey(K
, exchange_hash
, 'D', keyspace
); cscipher
->setsckey(keyspace
);
1996 ssh2_mkkey(K
, exchange_hash
, 'A', keyspace
); cscipher
->setcsiv(keyspace
);
1997 ssh2_mkkey(K
, exchange_hash
, 'B', keyspace
); sccipher
->setsciv(keyspace
);
1998 ssh2_mkkey(K
, exchange_hash
, 'E', keyspace
); csmac
->setcskey(keyspace
);
1999 ssh2_mkkey(K
, exchange_hash
, 'F', keyspace
); scmac
->setsckey(keyspace
);
2002 * Now we're encrypting. Begin returning 1 to the protocol main
2003 * function so that other things can run on top of the
2004 * transport. If we ever see a KEXINIT, we must go back to the
2009 } while (!(ispkt
&& pktin
.type
== SSH2_MSG_KEXINIT
));
2010 goto begin_key_exchange
;
2016 * SSH2: remote identifier for the main session channel.
2018 static unsigned long ssh_remote_channel
;
2021 * Handle the SSH2 userauth and connection layers.
2023 static void do_ssh2_authconn(unsigned char *in
, int inlen
, int ispkt
)
2025 static unsigned long remote_winsize
;
2026 static unsigned long remote_maxpkt
;
2031 * Request userauth protocol, and await a response to it.
2033 ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST
);
2034 ssh2_pkt_addstring("ssh-userauth");
2036 crWaitUntilV(ispkt
);
2037 if (pktin
.type
!= SSH2_MSG_SERVICE_ACCEPT
)
2038 fatalbox("Server refused user authentication protocol");
2041 * FIXME: currently we support only password authentication.
2042 * (This places us technically in violation of the SSH2 spec.
2043 * We must fix this.)
2047 * Get a username and a password.
2049 static char username
[100];
2050 static char password
[100];
2054 if ((flags
& FLAG_CONNECTION
) && !*cfg
.username
) {
2055 c_write("login as: ", 10);
2057 crWaitUntilV(!ispkt
);
2058 while (inlen
--) switch (c
= *in
++) {
2065 c_write("\b \b", 3);
2071 c_write("\b \b", 3);
2080 if (((c
>= ' ' && c
<= '~') ||
2081 ((unsigned char)c
>= 160)) && pos
< 40) {
2082 username
[pos
++] = c
;
2089 username
[strcspn(username
, "\n\r")] = '\0';
2092 strncpy(username
, cfg
.username
, 99);
2093 username
[99] = '\0';
2094 if (flags
& FLAG_VERBOSE
) {
2095 sprintf(stuff
, "Using username \"%s\".\r\n", username
);
2096 c_write(stuff
, strlen(stuff
));
2100 if (!(flags
& FLAG_WINDOWED
)) {
2102 sprintf(prompt
, "%s@%s's password: ", cfg
.username
, savedhost
);
2103 if (!ssh_get_password(prompt
, password
, sizeof(password
))) {
2105 * get_password failed to get a password (for
2106 * example because one was supplied on the command
2107 * line which has already failed to work).
2110 logevent("No more passwords to try");
2111 ssh_state
= SSH_STATE_CLOSED
;
2115 c_write("password: ", 10);
2119 crWaitUntilV(!ispkt
);
2120 while (inlen
--) switch (c
= *in
++) {
2137 if (((c
>= ' ' && c
<= '~') ||
2138 ((unsigned char)c
>= 160)) && pos
< 40)
2139 password
[pos
++] = c
;
2146 ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
2147 ssh2_pkt_addstring(username
);
2148 ssh2_pkt_addstring("ssh-connection"); /* service requested */
2149 ssh2_pkt_addstring("password");
2150 ssh2_pkt_addbool(FALSE
);
2151 ssh2_pkt_addstring(password
);
2154 crWaitUntilV(ispkt
);
2155 if (pktin
.type
!= SSH2_MSG_USERAUTH_SUCCESS
) {
2156 c_write("Access denied\r\n", 15);
2157 logevent("Authentication refused");
2163 * Now we're authenticated for the connection protocol. The
2164 * connection protocol will automatically have started at this
2165 * point; there's no need to send SERVICE_REQUEST.
2169 * So now create a channel with a session in it.
2171 ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
2172 ssh2_pkt_addstring("session");
2173 ssh2_pkt_adduint32(100); /* as good as any */
2174 ssh2_pkt_adduint32(0xFFFFFFFFUL
); /* very big window which we ignore */
2175 ssh2_pkt_adduint32(0xFFFFFFFFUL
); /* very big max pkt size */
2177 crWaitUntilV(ispkt
);
2178 if (pktin
.type
!= SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
2179 fatalbox("Server refused to open a session");
2180 /* FIXME: error data comes back in FAILURE packet */
2182 if (ssh2_pkt_getuint32() != 100) {
2183 fatalbox("Server's channel confirmation cited wrong channel");
2185 ssh_remote_channel
= ssh2_pkt_getuint32();
2186 remote_winsize
= ssh2_pkt_getuint32();
2187 remote_maxpkt
= ssh2_pkt_getuint32();
2188 logevent("Opened channel for session");
2191 * Now allocate a pty for the session.
2193 ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
2194 ssh2_pkt_adduint32(ssh_remote_channel
); /* recipient channel */
2195 ssh2_pkt_addstring("pty-req");
2196 ssh2_pkt_addbool(1); /* want reply */
2197 ssh2_pkt_addstring(cfg
.termtype
);
2198 ssh2_pkt_adduint32(cols
);
2199 ssh2_pkt_adduint32(rows
);
2200 ssh2_pkt_adduint32(0); /* pixel width */
2201 ssh2_pkt_adduint32(0); /* pixel height */
2202 ssh2_pkt_addstring_start();
2203 ssh2_pkt_addstring_data("\0", 1); /* TTY_OP_END, no special options */
2206 do { /* FIXME: pay attention to these */
2207 crWaitUntilV(ispkt
);
2208 } while (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2210 if (pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
2211 if (pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
2212 fatalbox("Server got confused by pty request");
2214 c_write("Server refused to allocate pty\r\n", 32);
2216 logevent("Allocated pty");
2222 ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
2223 ssh2_pkt_adduint32(ssh_remote_channel
); /* recipient channel */
2224 ssh2_pkt_addstring("shell");
2225 ssh2_pkt_addbool(1); /* want reply */
2227 do { /* FIXME: pay attention to these */
2228 crWaitUntilV(ispkt
);
2229 } while (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2230 if (pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
2231 if (pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
2232 fatalbox("Server got confused by shell request");
2234 fatalbox("Server refused to start a shell");
2236 logevent("Started a shell");
2246 if (pktin
.type
== SSH2_MSG_CHANNEL_DATA
||
2247 pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
) {
2250 if (ssh2_pkt_getuint32() != 100)
2251 continue; /* wrong channel */
2252 if (pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
&&
2253 ssh2_pkt_getuint32() != SSH2_EXTENDED_DATA_STDERR
)
2254 continue; /* extended but not stderr */
2255 ssh2_pkt_getstring(&data
, &length
);
2257 c_write(data
, length
);
2258 } else if (pktin
.type
== SSH2_MSG_DISCONNECT
) {
2259 ssh_state
= SSH_STATE_CLOSED
;
2260 logevent("Received disconnect request");
2261 } else if (pktin
.type
== SSH2_MSG_CHANNEL_REQUEST
) {
2262 continue; /* exit status et al; ignore (FIXME?) */
2263 } else if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2264 continue; /* ignore for now (FIXME!) */
2266 fatalbox("Strange packet received: type %d", pktin
.type
);
2269 /* FIXME: for now, ignore window size */
2270 ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA
);
2271 ssh2_pkt_adduint32(ssh_remote_channel
);
2272 ssh2_pkt_addstring_start();
2273 ssh2_pkt_addstring_data(in
, inlen
);
2282 * Handle the top-level SSH2 protocol.
2284 static void ssh2_protocol(unsigned char *in
, int inlen
, int ispkt
)
2286 if (do_ssh2_transport(in
, inlen
, ispkt
) == 0)
2288 do_ssh2_authconn(in
, inlen
, ispkt
);
2292 * Called to set up the connection. Will arrange for WM_NETEVENT
2293 * messages to be passed to the specified window, whose window
2294 * procedure should then call telnet_msg().
2296 * Returns an error message, or NULL on success.
2298 static char *ssh_init (HWND hwnd
, char *host
, int port
, char **realhost
) {
2302 if(crypto_startup() == 0)
2303 return "Microsoft high encryption pack not installed!";
2306 p
= connect_to_host(host
, port
, realhost
);
2311 return "Protocol initialisation error";
2313 if (hwnd
&& WSAAsyncSelect (s
, hwnd
, WM_NETEVENT
, FD_READ
| FD_CLOSE
) == SOCKET_ERROR
)
2314 switch (WSAGetLastError()) {
2315 case WSAENETDOWN
: return "Network is down";
2316 default: return "WSAAsyncSelect(): unknown error";
2323 * Process a WM_NETEVENT message. Will return 0 if the connection
2324 * has closed, or <0 for a socket error.
2326 static int ssh_msg (WPARAM wParam
, LPARAM lParam
) {
2331 * Because reading less than the whole of the available pending
2332 * data can generate an FD_READ event, we need to allow for the
2333 * possibility that FD_READ may arrive with FD_CLOSE already in
2334 * the queue; so it's possible that we can get here even with s
2335 * invalid. If so, we return 1 and don't worry about it.
2337 if (s
== INVALID_SOCKET
)
2340 if (WSAGETSELECTERROR(lParam
) != 0)
2341 return -WSAGETSELECTERROR(lParam
);
2343 switch (WSAGETSELECTEVENT(lParam
)) {
2346 ret
= recv(s
, buf
, sizeof(buf
), 0);
2347 if (ret
< 0 && WSAGetLastError() == WSAEWOULDBLOCK
)
2349 if (ret
< 0) /* any _other_ error */
2350 return -10000-WSAGetLastError();
2355 ssh_gotdata (buf
, ret
);
2356 if (ssh_state
== SSH_STATE_CLOSED
) {
2363 return 1; /* shouldn't happen, but WTF */
2367 * Called to send data down the Telnet connection.
2369 static void ssh_send (char *buf
, int len
) {
2370 if (s
== INVALID_SOCKET
)
2373 ssh_protocol(buf
, len
, 0);
2377 * Called to set the size of the window from Telnet's POV.
2379 static void ssh_size(void) {
2380 switch (ssh_state
) {
2381 case SSH_STATE_BEFORE_SIZE
:
2382 case SSH_STATE_CLOSED
:
2383 break; /* do nothing */
2384 case SSH_STATE_INTERMED
:
2385 size_needed
= TRUE
; /* buffer for later */
2387 case SSH_STATE_SESSION
:
2389 send_packet(SSH1_CMSG_WINDOW_SIZE
,
2390 PKT_INT
, rows
, PKT_INT
, cols
,
2391 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
2397 * Send Telnet special codes. TS_EOF is useful for `plink', so you
2398 * can send an EOF and collect resulting output (e.g. `plink
2401 static void ssh_special (Telnet_Special code
) {
2402 if (code
== TS_EOF
) {
2403 if (ssh_version
= 1) {
2404 send_packet(SSH1_CMSG_EOF
, PKT_END
);
2406 ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF
);
2407 ssh2_pkt_adduint32(ssh_remote_channel
);
2417 * Read and decrypt one incoming SSH packet.
2418 * (only used by pSCP)
2420 static void get_packet(void)
2422 unsigned char buf
[4096], *p
;
2429 while ((to_read
= s_rdpkt(&p
, &len
)) > 0) {
2430 if (to_read
> sizeof(buf
)) to_read
= sizeof(buf
);
2431 len
= s_read(buf
, to_read
);
2432 if (len
!= to_read
) {
2444 * Receive a block of data over the SSH link. Block until
2445 * all data is available. Return nr of bytes read (0 if lost connection).
2446 * (only used by pSCP)
2448 int ssh_scp_recv(unsigned char *buf
, int len
)
2450 static int pending_input_len
= 0;
2451 static unsigned char *pending_input_ptr
;
2454 if (pending_input_len
>= to_read
) {
2455 memcpy(buf
, pending_input_ptr
, to_read
);
2456 pending_input_ptr
+= to_read
;
2457 pending_input_len
-= to_read
;
2461 if (pending_input_len
> 0) {
2462 memcpy(buf
, pending_input_ptr
, pending_input_len
);
2463 buf
+= pending_input_len
;
2464 to_read
-= pending_input_len
;
2465 pending_input_len
= 0;
2468 if (s
== INVALID_SOCKET
)
2470 while (to_read
> 0) {
2472 if (s
== INVALID_SOCKET
)
2474 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
) {
2475 int plen
= GET_32BIT(pktin
.body
);
2476 if (plen
<= to_read
) {
2477 memcpy(buf
, pktin
.body
+ 4, plen
);
2481 memcpy(buf
, pktin
.body
+ 4, to_read
);
2482 pending_input_len
= plen
- to_read
;
2483 pending_input_ptr
= pktin
.body
+ 4 + to_read
;
2486 } else if (pktin
.type
== SSH1_SMSG_STDERR_DATA
) {
2487 int plen
= GET_32BIT(pktin
.body
);
2488 fwrite(pktin
.body
+ 4, plen
, 1, stderr
);
2489 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
2490 logevent("Received disconnect request");
2491 } else if (pktin
.type
== SSH1_SMSG_SUCCESS
||
2492 pktin
.type
== SSH1_SMSG_FAILURE
) {
2494 } else if (pktin
.type
== SSH1_SMSG_EXIT_STATUS
) {
2496 sprintf(logbuf
, "Remote exit status: %d", GET_32BIT(pktin
.body
));
2498 send_packet(SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
2499 logevent("Closing connection");
2503 fatalbox("Strange packet received: type %d", pktin
.type
);
2511 * Send a block of data over the SSH link.
2512 * Block until all data is sent.
2513 * (only used by pSCP)
2515 void ssh_scp_send(unsigned char *buf
, int len
)
2517 if (s
== INVALID_SOCKET
)
2519 send_packet(SSH1_CMSG_STDIN_DATA
,
2520 PKT_INT
, len
, PKT_DATA
, buf
, len
, PKT_END
);
2524 * Send an EOF notification to the server.
2525 * (only used by pSCP)
2527 void ssh_scp_send_eof(void)
2529 if (s
== INVALID_SOCKET
)
2531 send_packet(SSH1_CMSG_EOF
, PKT_END
);
2535 * Set up the connection, login on the remote host and
2536 * start execution of a command.
2537 * Returns an error message, or NULL on success.
2538 * (only used by pSCP)
2540 char *ssh_scp_init(char *host
, int port
, char *cmd
, char **realhost
)
2545 if (crypto_startup() == 0)
2546 return "Microsoft high encryption pack not installed!";
2549 p
= connect_to_host(host
, port
, realhost
);
2556 return "Protocol initialisation error";
2558 /* Exchange keys and login */
2561 if (s
== INVALID_SOCKET
)
2562 return "Connection closed by remote host";
2563 } while (!do_ssh1_login(NULL
, 0, 1));
2565 if (ssh_state
== SSH_STATE_CLOSED
) {
2568 return "Session initialisation error";
2571 /* Execute command */
2572 sprintf(buf
, "Sending command: %.100s", cmd
);
2574 send_packet(SSH1_CMSG_EXEC_CMD
, PKT_STR
, cmd
, PKT_END
);
2579 static SOCKET
ssh_socket(void) { return s
; }
2581 static int ssh_sendok(void) { return ssh_send_ok
; }
2583 Backend ssh_backend
= {