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 /* 0x1 */
24 #define SSH1_SMSG_PUBLIC_KEY 2 /* 0x2 */
25 #define SSH1_CMSG_SESSION_KEY 3 /* 0x3 */
26 #define SSH1_CMSG_USER 4 /* 0x4 */
27 #define SSH1_CMSG_AUTH_RSA 6 /* 0x6 */
28 #define SSH1_SMSG_AUTH_RSA_CHALLENGE 7 /* 0x7 */
29 #define SSH1_CMSG_AUTH_RSA_RESPONSE 8 /* 0x8 */
30 #define SSH1_CMSG_AUTH_PASSWORD 9 /* 0x9 */
31 #define SSH1_CMSG_REQUEST_PTY 10 /* 0xa */
32 #define SSH1_CMSG_WINDOW_SIZE 11 /* 0xb */
33 #define SSH1_CMSG_EXEC_SHELL 12 /* 0xc */
34 #define SSH1_CMSG_EXEC_CMD 13 /* 0xd */
35 #define SSH1_SMSG_SUCCESS 14 /* 0xe */
36 #define SSH1_SMSG_FAILURE 15 /* 0xf */
37 #define SSH1_CMSG_STDIN_DATA 16 /* 0x10 */
38 #define SSH1_SMSG_STDOUT_DATA 17 /* 0x11 */
39 #define SSH1_SMSG_STDERR_DATA 18 /* 0x12 */
40 #define SSH1_CMSG_EOF 19 /* 0x13 */
41 #define SSH1_SMSG_EXIT_STATUS 20 /* 0x14 */
42 #define SSH1_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* 0x15 */
43 #define SSH1_MSG_CHANNEL_OPEN_FAILURE 22 /* 0x16 */
44 #define SSH1_MSG_CHANNEL_DATA 23 /* 0x17 */
45 #define SSH1_MSG_CHANNEL_CLOSE 24 /* 0x18 */
46 #define SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* 0x19 */
47 #define SSH1_CMSG_AGENT_REQUEST_FORWARDING 30 /* 0x1e */
48 #define SSH1_SMSG_AGENT_OPEN 31 /* 0x1f */
49 #define SSH1_CMSG_EXIT_CONFIRMATION 33 /* 0x21 */
50 #define SSH1_MSG_IGNORE 32 /* 0x20 */
51 #define SSH1_MSG_DEBUG 36 /* 0x24 */
52 #define SSH1_CMSG_AUTH_TIS 39 /* 0x27 */
53 #define SSH1_SMSG_AUTH_TIS_CHALLENGE 40 /* 0x28 */
54 #define SSH1_CMSG_AUTH_TIS_RESPONSE 41 /* 0x29 */
55 #define SSH1_CMSG_AUTH_CCARD 70 /* 0x46 */
56 #define SSH1_SMSG_AUTH_CCARD_CHALLENGE 71 /* 0x47 */
57 #define SSH1_CMSG_AUTH_CCARD_RESPONSE 72 /* 0x48 */
59 #define SSH1_AUTH_TIS 5 /* 0x5 */
60 #define SSH1_AUTH_CCARD 16 /* 0x10 */
62 #define SSH_AGENTC_REQUEST_RSA_IDENTITIES 1 /* 0x1 */
63 #define SSH_AGENT_RSA_IDENTITIES_ANSWER 2 /* 0x2 */
64 #define SSH_AGENTC_RSA_CHALLENGE 3 /* 0x3 */
65 #define SSH_AGENT_RSA_RESPONSE 4 /* 0x4 */
66 #define SSH_AGENT_FAILURE 5 /* 0x5 */
67 #define SSH_AGENT_SUCCESS 6 /* 0x6 */
68 #define SSH_AGENTC_ADD_RSA_IDENTITY 7 /* 0x7 */
69 #define SSH_AGENTC_REMOVE_RSA_IDENTITY 8 /* 0x8 */
71 #define SSH2_MSG_DISCONNECT 1 /* 0x1 */
72 #define SSH2_MSG_IGNORE 2 /* 0x2 */
73 #define SSH2_MSG_UNIMPLEMENTED 3 /* 0x3 */
74 #define SSH2_MSG_DEBUG 4 /* 0x4 */
75 #define SSH2_MSG_SERVICE_REQUEST 5 /* 0x5 */
76 #define SSH2_MSG_SERVICE_ACCEPT 6 /* 0x6 */
77 #define SSH2_MSG_KEXINIT 20 /* 0x14 */
78 #define SSH2_MSG_NEWKEYS 21 /* 0x15 */
79 #define SSH2_MSG_KEXDH_INIT 30 /* 0x1e */
80 #define SSH2_MSG_KEXDH_REPLY 31 /* 0x1f */
81 #define SSH2_MSG_USERAUTH_REQUEST 50 /* 0x32 */
82 #define SSH2_MSG_USERAUTH_FAILURE 51 /* 0x33 */
83 #define SSH2_MSG_USERAUTH_SUCCESS 52 /* 0x34 */
84 #define SSH2_MSG_USERAUTH_BANNER 53 /* 0x35 */
85 #define SSH2_MSG_USERAUTH_PK_OK 60 /* 0x3c */
86 #define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ 60 /* 0x3c */
87 #define SSH2_MSG_GLOBAL_REQUEST 80 /* 0x50 */
88 #define SSH2_MSG_REQUEST_SUCCESS 81 /* 0x51 */
89 #define SSH2_MSG_REQUEST_FAILURE 82 /* 0x52 */
90 #define SSH2_MSG_CHANNEL_OPEN 90 /* 0x5a */
91 #define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION 91 /* 0x5b */
92 #define SSH2_MSG_CHANNEL_OPEN_FAILURE 92 /* 0x5c */
93 #define SSH2_MSG_CHANNEL_WINDOW_ADJUST 93 /* 0x5d */
94 #define SSH2_MSG_CHANNEL_DATA 94 /* 0x5e */
95 #define SSH2_MSG_CHANNEL_EXTENDED_DATA 95 /* 0x5f */
96 #define SSH2_MSG_CHANNEL_EOF 96 /* 0x60 */
97 #define SSH2_MSG_CHANNEL_CLOSE 97 /* 0x61 */
98 #define SSH2_MSG_CHANNEL_REQUEST 98 /* 0x62 */
99 #define SSH2_MSG_CHANNEL_SUCCESS 99 /* 0x63 */
100 #define SSH2_MSG_CHANNEL_FAILURE 100 /* 0x64 */
102 #define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1 /* 0x1 */
103 #define SSH2_OPEN_CONNECT_FAILED 2 /* 0x2 */
104 #define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3 /* 0x3 */
105 #define SSH2_OPEN_RESOURCE_SHORTAGE 4 /* 0x4 */
107 #define SSH2_EXTENDED_DATA_STDERR 1 /* 0x1 */
109 #define GET_32BIT(cp) \
110 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
111 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
112 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
113 ((unsigned long)(unsigned char)(cp)[3]))
115 #define PUT_32BIT(cp, value) { \
116 (cp)[0] = (unsigned char)((value) >> 24); \
117 (cp)[1] = (unsigned char)((value) >> 16); \
118 (cp)[2] = (unsigned char)((value) >> 8); \
119 (cp)[3] = (unsigned char)(value); }
121 enum { PKT_END
, PKT_INT
, PKT_CHAR
, PKT_DATA
, PKT_STR
, PKT_BIGNUM
};
123 /* Coroutine mechanics for the sillier bits of the code */
124 #define crBegin1 static int crLine = 0;
125 #define crBegin2 switch(crLine) { case 0:;
126 #define crBegin crBegin1; crBegin2;
127 #define crFinish(z) } crLine = 0; return (z)
128 #define crFinishV } crLine = 0; return
129 #define crReturn(z) \
131 crLine=__LINE__; return (z); case __LINE__:;\
135 crLine=__LINE__; return; case __LINE__:;\
137 #define crStop(z) do{ crLine = 0; return (z); }while(0)
138 #define crStopV do{ crLine = 0; return; }while(0)
139 #define crWaitUntil(c) do { crReturn(0); } while (!(c))
140 #define crWaitUntilV(c) do { crReturnV; } while (!(c))
142 extern struct ssh_cipher ssh_3des
;
143 extern struct ssh_cipher ssh_3des_ssh2
;
144 extern struct ssh_cipher ssh_des
;
145 extern struct ssh_cipher ssh_blowfish
;
147 /* for ssh 2; we miss out single-DES because it isn't supported */
148 struct ssh_cipher
*ciphers
[] = { &ssh_3des_ssh2
, &ssh_blowfish
};
150 extern struct ssh_kex ssh_diffiehellman
;
151 struct ssh_kex
*kex_algs
[] = { &ssh_diffiehellman
};
153 extern struct ssh_hostkey ssh_dss
;
154 struct ssh_hostkey
*hostkey_algs
[] = { &ssh_dss
};
156 extern struct ssh_mac ssh_sha1
;
158 static SHA_State exhash
;
160 static void nullmac_key(unsigned char *key
) { }
161 static void nullmac_generate(unsigned char *blk
, int len
, unsigned long seq
) { }
162 static int nullmac_verify(unsigned char *blk
, int len
, unsigned long seq
) { return 1; }
163 struct ssh_mac ssh_mac_none
= {
164 nullmac_key
, nullmac_key
, nullmac_generate
, nullmac_verify
, "none", 0
166 struct ssh_mac
*macs
[] = { &ssh_sha1
, &ssh_mac_none
};
168 struct ssh_compress ssh_comp_none
= {
171 struct ssh_compress
*compressions
[] = { &ssh_comp_none
};
173 static SOCKET s
= INVALID_SOCKET
;
175 static unsigned char session_key
[32];
176 static struct ssh_cipher
*cipher
= NULL
;
177 static struct ssh_cipher
*cscipher
= NULL
;
178 static struct ssh_cipher
*sccipher
= NULL
;
179 static struct ssh_mac
*csmac
= NULL
;
180 static struct ssh_mac
*scmac
= NULL
;
181 static struct ssh_compress
*cscomp
= NULL
;
182 static struct ssh_compress
*sccomp
= NULL
;
183 static struct ssh_kex
*kex
= NULL
;
184 static struct ssh_hostkey
*hostkey
= NULL
;
185 int (*ssh_get_password
)(const char *prompt
, char *str
, int maxlen
) = NULL
;
187 static char *savedhost
;
188 static int ssh_send_ok
;
191 * 2-3-4 tree storing channels.
194 unsigned remoteid
, localid
;
198 struct ssh_agent_channel
{
199 unsigned char *message
;
200 unsigned char msglen
[4];
201 int lensofar
, totallen
;
203 struct ssh2_data_channel
{
204 unsigned char *outbuffer
;
205 unsigned outbuflen
, outbufsize
;
206 unsigned remwindow
, remmaxpkt
;
210 static tree234
*ssh_channels
; /* indexed by local id */
211 static int ssh_channelcmp(void *av
, void *bv
) {
212 struct ssh_channel
*a
= (struct ssh_channel
*)av
;
213 struct ssh_channel
*b
= (struct ssh_channel
*)bv
;
214 if (a
->localid
< b
->localid
) return -1;
215 if (a
->localid
> b
->localid
) return +1;
218 static int ssh_channelfind(void *av
, void *bv
) {
219 unsigned *a
= (unsigned *)av
;
220 struct ssh_channel
*b
= (struct ssh_channel
*)bv
;
221 if (*a
< b
->localid
) return -1;
222 if (*a
> b
->localid
) return +1;
226 static struct ssh_channel
*mainchan
; /* primary session channel */
229 SSH_STATE_BEFORE_SIZE
,
233 } ssh_state
= SSH_STATE_BEFORE_SIZE
;
235 static int size_needed
= FALSE
;
237 static void s_write (char *buf
, int len
) {
239 int i
= send (s
, buf
, len
, 0);
242 fatalbox("Lost connection while sending");
248 static int s_read (char *buf
, int len
) {
251 int i
= recv (s
, buf
, len
, 0);
254 len
-= i
, buf
+= i
, ret
+= i
;
261 static void c_write (char *buf
, int len
) {
262 if (!(flags
& FLAG_CONNECTION
)) {
264 for (i
= 0; i
< len
; i
++)
266 fputc(buf
[i
], stderr
);
282 static struct Packet pktin
= { 0, 0, NULL
, NULL
, 0 };
283 static struct Packet pktout
= { 0, 0, NULL
, NULL
, 0 };
285 static int ssh_version
;
286 static void (*ssh_protocol
)(unsigned char *in
, int inlen
, int ispkt
);
287 static void ssh1_protocol(unsigned char *in
, int inlen
, int ispkt
);
288 static void ssh2_protocol(unsigned char *in
, int inlen
, int ispkt
);
289 static void ssh_size(void);
291 static int (*s_rdpkt
)(unsigned char **data
, int *datalen
);
294 * Collect incoming data in the incoming packet buffer.
295 * Decipher and verify the packet when it is completely read.
296 * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets.
297 * Update the *data and *datalen variables.
298 * Return the additional nr of bytes needed, or 0 when
299 * a complete packet is available.
301 static int ssh1_rdpkt(unsigned char **data
, int *datalen
)
303 static long len
, pad
, biglen
, to_read
;
304 static unsigned long realcrc
, gotcrc
;
305 static unsigned char *p
;
315 for (i
= len
= 0; i
< 4; i
++) {
316 while ((*datalen
) == 0)
318 len
= (len
<< 8) + **data
;
319 (*data
)++, (*datalen
)--;
323 if (len
== 0x52656d6f) { /* "Remo"te server has closed ... */
324 len
= 0x300; /* big enough to carry to end */
330 pktin
.length
= len
- 5;
332 if (pktin
.maxlen
< biglen
) {
333 pktin
.maxlen
= biglen
;
334 pktin
.data
= (pktin
.data
== NULL ?
malloc(biglen
+APIEXTRA
) :
335 realloc(pktin
.data
, biglen
+APIEXTRA
));
337 fatalbox("Out of memory");
342 while (to_read
> 0) {
345 while ((*datalen
) == 0)
347 if (chunk
> (*datalen
))
349 memcpy(p
, *data
, chunk
);
357 cipher
->decrypt(pktin
.data
, biglen
);
359 pktin
.type
= pktin
.data
[pad
];
360 pktin
.body
= pktin
.data
+ pad
+ 1;
362 realcrc
= crc32(pktin
.data
, biglen
-4);
363 gotcrc
= GET_32BIT(pktin
.data
+biglen
-4);
364 if (gotcrc
!= realcrc
) {
365 fatalbox("Incorrect CRC received on packet");
368 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
369 pktin
.type
== SSH1_SMSG_STDERR_DATA
||
370 pktin
.type
== SSH1_MSG_DEBUG
||
371 pktin
.type
== SSH1_SMSG_AUTH_TIS_CHALLENGE
||
372 pktin
.type
== SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
373 long strlen
= GET_32BIT(pktin
.body
);
374 if (strlen
+ 4 != pktin
.length
)
375 fatalbox("Received data packet with bogus string length");
378 if (pktin
.type
== SSH1_MSG_DEBUG
) {
379 /* log debug message */
381 int strlen
= GET_32BIT(pktin
.body
);
382 strcpy(buf
, "Remote: ");
383 if (strlen
> 70) strlen
= 70;
384 memcpy(buf
+8, pktin
.body
+4, strlen
);
385 buf
[8+strlen
] = '\0';
388 } else if (pktin
.type
== SSH1_MSG_IGNORE
) {
396 static int ssh2_rdpkt(unsigned char **data
, int *datalen
)
398 static long len
, pad
, payload
, packetlen
, maclen
;
400 static int cipherblk
;
401 static unsigned long incoming_sequence
= 0;
411 cipherblk
= cipher
->blksize
;
417 if (pktin
.maxlen
< cipherblk
) {
418 pktin
.maxlen
= cipherblk
;
419 pktin
.data
= (pktin
.data
== NULL ?
malloc(cipherblk
+APIEXTRA
) :
420 realloc(pktin
.data
, cipherblk
+APIEXTRA
));
422 fatalbox("Out of memory");
426 * Acquire and decrypt the first block of the packet. This will
427 * contain the length and padding details.
429 for (i
= len
= 0; i
< cipherblk
; i
++) {
430 while ((*datalen
) == 0)
431 crReturn(cipherblk
-i
);
432 pktin
.data
[i
] = *(*data
)++;
436 if (!memcmp(pktin
.data
, "Remo", 4)) {/* "Remo"te server has closed ... */
441 sccipher
->decrypt(pktin
.data
, cipherblk
);
444 * Now get the length and padding figures.
446 len
= GET_32BIT(pktin
.data
);
450 * This enables us to deduce the payload length.
452 payload
= len
- pad
- 1;
454 pktin
.length
= payload
+ 5;
457 * So now we can work out the total packet length.
460 maclen
= scmac ? scmac
->len
: 0;
463 * Adjust memory allocation if packet is too big.
465 if (pktin
.maxlen
< packetlen
+maclen
) {
466 pktin
.maxlen
= packetlen
+maclen
;
467 pktin
.data
= (pktin
.data
== NULL ?
malloc(pktin
.maxlen
+APIEXTRA
) :
468 realloc(pktin
.data
, pktin
.maxlen
+APIEXTRA
));
470 fatalbox("Out of memory");
474 * Read and decrypt the remainder of the packet.
476 for (i
= cipherblk
; i
< packetlen
+ maclen
; i
++) {
477 while ((*datalen
) == 0)
478 crReturn(packetlen
+ maclen
- i
);
479 pktin
.data
[i
] = *(*data
)++;
482 /* Decrypt everything _except_ the MAC. */
484 sccipher
->decrypt(pktin
.data
+ cipherblk
, packetlen
- cipherblk
);
487 debug(("Got packet len=%d pad=%d\r\n", len
, pad
));
488 for (i
= 0; i
< packetlen
; i
++)
489 debug((" %02x", (unsigned char)pktin
.data
[i
]));
496 if (scmac
&& !scmac
->verify(pktin
.data
, len
+4, incoming_sequence
))
497 fatalbox("Incorrect MAC received on packet");
498 incoming_sequence
++; /* whether or not we MACed */
501 pktin
.type
= pktin
.data
[5];
503 if (pktin
.type
== SSH2_MSG_IGNORE
|| pktin
.type
== SSH2_MSG_DEBUG
)
504 goto next_packet
; /* FIXME: print DEBUG message */
509 static void ssh_gotdata(unsigned char *data
, int datalen
)
511 while (datalen
> 0) {
512 if ( s_rdpkt(&data
, &datalen
) == 0 ) {
513 ssh_protocol(NULL
, 0, 1);
514 if (ssh_state
== SSH_STATE_CLOSED
) {
522 static void s_wrpkt_start(int type
, int len
) {
525 len
+= 5; /* type and CRC */
529 pktout
.length
= len
-5;
530 if (pktout
.maxlen
< biglen
) {
531 pktout
.maxlen
= biglen
;
533 /* Allocate enough buffer space for extra block
534 * for MS CryptEncrypt() */
535 pktout
.data
= (pktout
.data
== NULL ?
malloc(biglen
+12) :
536 realloc(pktout
.data
, biglen
+12));
538 pktout
.data
= (pktout
.data
== NULL ?
malloc(biglen
+4) :
539 realloc(pktout
.data
, biglen
+4));
542 fatalbox("Out of memory");
546 pktout
.body
= pktout
.data
+4+pad
+1;
549 static void s_wrpkt(void) {
550 int pad
, len
, biglen
, i
;
553 len
= pktout
.length
+ 5; /* type and CRC */
557 pktout
.body
[-1] = pktout
.type
;
558 for (i
=0; i
<pad
; i
++)
559 pktout
.data
[i
+4] = random_byte();
560 crc
= crc32(pktout
.data
+4, biglen
-4);
561 PUT_32BIT(pktout
.data
+biglen
, crc
);
562 PUT_32BIT(pktout
.data
, len
);
565 cipher
->encrypt(pktout
.data
+4, biglen
);
567 s_write(pktout
.data
, biglen
+4);
571 * Construct a packet with the specified contents and
572 * send it to the server.
574 static void send_packet(int pkttype
, ...)
577 unsigned char *p
, *argp
, argchar
;
578 unsigned long argint
;
579 int pktlen
, argtype
, arglen
;
583 va_start(args
, pkttype
);
584 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
587 (void) va_arg(args
, int);
591 (void) va_arg(args
, char);
595 (void) va_arg(args
, unsigned char *);
596 arglen
= va_arg(args
, int);
600 argp
= va_arg(args
, unsigned char *);
601 arglen
= strlen(argp
);
602 pktlen
+= 4 + arglen
;
605 bn
= va_arg(args
, Bignum
);
606 pktlen
+= ssh1_bignum_length(bn
);
614 s_wrpkt_start(pkttype
, pktlen
);
617 va_start(args
, pkttype
);
618 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
621 argint
= va_arg(args
, int);
622 PUT_32BIT(p
, argint
);
626 argchar
= va_arg(args
, unsigned char);
631 argp
= va_arg(args
, unsigned char *);
632 arglen
= va_arg(args
, int);
633 memcpy(p
, argp
, arglen
);
637 argp
= va_arg(args
, unsigned char *);
638 arglen
= strlen(argp
);
639 PUT_32BIT(p
, arglen
);
640 memcpy(p
+ 4, argp
, arglen
);
644 bn
= va_arg(args
, Bignum
);
645 p
+= ssh1_write_bignum(p
, bn
);
656 * Connect to specified host and port.
657 * Returns an error message, or NULL on success.
658 * Also places the canonical host name into `realhost'.
660 static char *connect_to_host(char *host
, int port
, char **realhost
)
670 savedhost
= malloc(1+strlen(host
));
672 fatalbox("Out of memory");
673 strcpy(savedhost
, host
);
676 port
= 22; /* default ssh port */
688 if ( (a
= inet_addr(host
)) == (unsigned long) INADDR_NONE
) {
689 if ( (h
= gethostbyname(host
)) == NULL
)
690 switch (WSAGetLastError()) {
691 case WSAENETDOWN
: return "Network is down";
692 case WSAHOST_NOT_FOUND
: case WSANO_DATA
:
693 return "Host does not exist";
694 case WSATRY_AGAIN
: return "Host not found";
695 default: return "gethostbyname: unknown error";
697 memcpy (&a
, h
->h_addr
, sizeof(a
));
698 *realhost
= h
->h_name
;
709 s
= socket(AF_INET
, SOCK_STREAM
, 0);
710 if (s
== INVALID_SOCKET
)
711 switch (WSAGetLastError()) {
712 case WSAENETDOWN
: return "Network is down";
713 case WSAEAFNOSUPPORT
: return "TCP/IP support not present";
714 default: return "socket(): unknown error";
718 * Bind to local address.
720 addr
.sin_family
= AF_INET
;
721 addr
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
722 addr
.sin_port
= htons(0);
723 if (bind (s
, (struct sockaddr
*)&addr
, sizeof(addr
)) == SOCKET_ERROR
)
724 switch (WSAGetLastError()) {
725 case WSAENETDOWN
: return "Network is down";
726 default: return "bind(): unknown error";
730 * Connect to remote address.
732 addr
.sin_addr
.s_addr
= htonl(a
);
733 addr
.sin_port
= htons((short)port
);
734 if (connect (s
, (struct sockaddr
*)&addr
, sizeof(addr
)) == SOCKET_ERROR
)
735 switch (WSAGetLastError()) {
736 case WSAENETDOWN
: return "Network is down";
737 case WSAECONNREFUSED
: return "Connection refused";
738 case WSAENETUNREACH
: return "Network is unreachable";
739 case WSAEHOSTUNREACH
: return "No route to host";
740 default: return "connect(): unknown error";
744 send(s
, "connect ", 8, 0);
745 send(s
, FWhost
, strlen(FWhost
), 0);
748 sprintf(buf
, " %d\n", FWport
);
749 send (s
, buf
, strlen(buf
), 0);
756 static int ssh_versioncmp(char *a
, char *b
) {
758 unsigned long av
, bv
;
760 av
= strtoul(a
, &ae
, 10);
761 bv
= strtoul(b
, &be
, 10);
762 if (av
!= bv
) return (av
< bv ?
-1 : +1);
763 if (*ae
== '.') ae
++;
764 if (*be
== '.') be
++;
765 av
= strtoul(ae
, &ae
, 10);
766 bv
= strtoul(be
, &be
, 10);
767 if (av
!= bv
) return (av
< bv ?
-1 : +1);
773 * Utility routine for putting an SSH-protocol `string' into a SHA
777 void sha_string(SHA_State
*s
, void *str
, int len
) {
778 unsigned char lenblk
[4];
779 PUT_32BIT(lenblk
, len
);
780 SHA_Bytes(s
, lenblk
, 4);
781 SHA_Bytes(s
, str
, len
);
785 * SSH2 packet construction functions.
787 void ssh2_pkt_adddata(void *data
, int len
) {
788 pktout
.length
+= len
;
789 if (pktout
.maxlen
< pktout
.length
) {
790 pktout
.maxlen
= pktout
.length
+ 256;
791 pktout
.data
= (pktout
.data
== NULL ?
malloc(pktout
.maxlen
+APIEXTRA
) :
792 realloc(pktout
.data
, pktout
.maxlen
+APIEXTRA
));
794 fatalbox("Out of memory");
796 memcpy(pktout
.data
+pktout
.length
-len
, data
, len
);
798 void ssh2_pkt_addbyte(unsigned char byte
) {
799 ssh2_pkt_adddata(&byte
, 1);
801 void ssh2_pkt_init(int pkt_type
) {
803 ssh2_pkt_addbyte((unsigned char)pkt_type
);
805 void ssh2_pkt_addbool(unsigned char value
) {
806 ssh2_pkt_adddata(&value
, 1);
808 void ssh2_pkt_adduint32(unsigned long value
) {
811 ssh2_pkt_adddata(x
, 4);
813 void ssh2_pkt_addstring_start(void) {
814 ssh2_pkt_adduint32(0);
815 pktout
.savedpos
= pktout
.length
;
817 void ssh2_pkt_addstring_str(char *data
) {
818 ssh2_pkt_adddata(data
, strlen(data
));
819 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
820 pktout
.length
- pktout
.savedpos
);
822 void ssh2_pkt_addstring_data(char *data
, int len
) {
823 ssh2_pkt_adddata(data
, len
);
824 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
825 pktout
.length
- pktout
.savedpos
);
827 void ssh2_pkt_addstring(char *data
) {
828 ssh2_pkt_addstring_start();
829 ssh2_pkt_addstring_str(data
);
831 char *ssh2_mpint_fmt(Bignum b
, int *len
) {
834 p
= malloc(n
* 2 + 1);
836 fatalbox("out of memory");
838 for (i
= 0; i
< n
; i
++) {
839 p
[i
*2+1] = (b
[n
-i
] >> 8) & 0xFF;
840 p
[i
*2+2] = (b
[n
-i
] ) & 0xFF;
843 while (p
[i
] == 0 && (p
[i
+1] & 0x80) == 0)
845 memmove(p
, p
+i
, n
*2+1-i
);
849 void ssh2_pkt_addmp(Bignum b
) {
852 p
= ssh2_mpint_fmt(b
, &len
);
853 ssh2_pkt_addstring_start();
854 ssh2_pkt_addstring_data(p
, len
);
857 void ssh2_pkt_send(void) {
858 int cipherblk
, maclen
, padding
, i
;
859 static unsigned long outgoing_sequence
= 0;
862 * Add padding. At least four bytes, and must also bring total
863 * length (minus MAC) up to a multiple of the block size.
865 cipherblk
= cipher ? cipher
->blksize
: 8; /* block size */
866 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
868 padding
+= (cipherblk
- (pktout
.length
+ padding
) % cipherblk
) % cipherblk
;
869 pktout
.data
[4] = padding
;
870 for (i
= 0; i
< padding
; i
++)
871 pktout
.data
[pktout
.length
+ i
] = random_byte();
872 PUT_32BIT(pktout
.data
, pktout
.length
+ padding
- 4);
874 csmac
->generate(pktout
.data
, pktout
.length
+ padding
,
876 outgoing_sequence
++; /* whether or not we MACed */
879 debug(("Sending packet len=%d\r\n", pktout
.length
+padding
));
880 for (i
= 0; i
< pktout
.length
+padding
; i
++)
881 debug((" %02x", (unsigned char)pktout
.data
[i
]));
886 cscipher
->encrypt(pktout
.data
, pktout
.length
+ padding
);
887 maclen
= csmac ? csmac
->len
: 0;
889 s_write(pktout
.data
, pktout
.length
+ padding
+ maclen
);
893 void bndebug(char *string
, Bignum b
) {
896 p
= ssh2_mpint_fmt(b
, &len
);
897 debug(("%s", string
));
898 for (i
= 0; i
< len
; i
++)
899 debug((" %02x", p
[i
]));
905 void sha_mpint(SHA_State
*s
, Bignum b
) {
908 p
= ssh2_mpint_fmt(b
, &len
);
909 sha_string(s
, p
, len
);
914 * SSH2 packet decode functions.
916 unsigned long ssh2_pkt_getuint32(void) {
918 if (pktin
.length
- pktin
.savedpos
< 4)
919 return 0; /* arrgh, no way to decline (FIXME?) */
920 value
= GET_32BIT(pktin
.data
+pktin
.savedpos
);
924 void ssh2_pkt_getstring(char **p
, int *length
) {
926 if (pktin
.length
- pktin
.savedpos
< 4)
928 *length
= GET_32BIT(pktin
.data
+pktin
.savedpos
);
930 if (pktin
.length
- pktin
.savedpos
< *length
)
932 *p
= pktin
.data
+pktin
.savedpos
;
933 pktin
.savedpos
+= *length
;
935 Bignum
ssh2_pkt_getmp(void) {
940 ssh2_pkt_getstring(&p
, &length
);
944 fatalbox("internal error: Can't handle negative mpints");
945 b
= newbn((length
+1)/2);
946 for (i
= 0; i
< length
; i
++) {
949 b
[j
/2+1] |= ((unsigned char)p
[i
]) << 8;
951 b
[j
/2+1] |= ((unsigned char)p
[i
]);
956 static int do_ssh_init(void) {
960 char vlog
[sizeof(vstring
)+20];
965 while (s_read(&c
, 1) == 1) {
966 if (c
== 'S' && i
< 2) i
++;
967 else if (c
== 'S' && i
== 2) i
= 2;
968 else if (c
== 'H' && i
== 2) break;
972 if (s_read(&c
,1) != 1 || c
!= 'S') return 0;
973 if (s_read(&c
,1) != 1 || c
!= 'S') return 0;
974 if (s_read(&c
,1) != 1 || c
!= 'H') return 0;
976 strcpy(vstring
, "SSH-");
978 if (s_read(&c
,1) != 1 || c
!= '-') return 0;
981 if (s_read(&c
,1) != 1)
983 if (vsp
< vstring
+sizeof(vstring
)-1)
989 } else if (i
< sizeof(version
)-1)
997 sprintf(vlog
, "Server version: %s", vstring
);
998 vlog
[strcspn(vlog
, "\r\n")] = '\0';
1002 * Server version "1.99" means we can choose whether we use v1
1003 * or v2 protocol. Choice is based on cfg.sshprot.
1005 if (ssh_versioncmp(version
, cfg
.sshprot
== 1 ?
"2.0" : "1.99") >= 0) {
1007 * This is a v2 server. Begin v2 protocol.
1009 char *verstring
= "SSH-2.0-PuTTY";
1012 * Hash our version string and their version string.
1014 sha_string(&exhash
, verstring
, strlen(verstring
));
1015 sha_string(&exhash
, vstring
, strcspn(vstring
, "\r\n"));
1016 sprintf(vstring
, "%s\n", verstring
);
1017 sprintf(vlog
, "We claim version: %s", verstring
);
1019 logevent("Using SSH protocol version 2");
1020 s_write(vstring
, strlen(vstring
));
1021 ssh_protocol
= ssh2_protocol
;
1023 s_rdpkt
= ssh2_rdpkt
;
1026 * This is a v1 server. Begin v1 protocol.
1028 sprintf(vstring
, "SSH-%s-PuTTY\n",
1029 (ssh_versioncmp(version
, "1.5") <= 0 ? version
: "1.5"));
1030 sprintf(vlog
, "We claim version: %s", vstring
);
1031 vlog
[strcspn(vlog
, "\r\n")] = '\0';
1033 logevent("Using SSH protocol version 1");
1034 s_write(vstring
, strlen(vstring
));
1035 ssh_protocol
= ssh1_protocol
;
1037 s_rdpkt
= ssh1_rdpkt
;
1044 * Handle the key exchange and user authentication phases.
1046 static int do_ssh1_login(unsigned char *in
, int inlen
, int ispkt
)
1049 unsigned char *rsabuf
, *keystr1
, *keystr2
;
1050 unsigned char cookie
[8];
1051 struct RSAKey servkey
, hostkey
;
1052 struct MD5Context md5c
;
1053 static unsigned long supported_ciphers_mask
, supported_auths_mask
;
1054 static int tried_publickey
;
1055 static unsigned char session_id
[16];
1060 if (!ispkt
) crWaitUntil(ispkt
);
1062 if (pktin
.type
!= SSH1_SMSG_PUBLIC_KEY
)
1063 fatalbox("Public key packet not received");
1065 logevent("Received public keys");
1067 memcpy(cookie
, pktin
.body
, 8);
1069 i
= makekey(pktin
.body
+8, &servkey
, &keystr1
, 0);
1070 j
= makekey(pktin
.body
+8+i
, &hostkey
, &keystr2
, 0);
1073 * Hash the host key and print the hash in the log box. Just as
1074 * a last resort in case the registry's host key checking is
1075 * compromised, we'll allow the user some ability to verify
1079 MD5Update(&md5c
, keystr2
, hostkey
.bytes
);
1080 MD5Final(session_id
, &md5c
);
1084 logevent("Host key MD5 is:");
1085 strcpy(logmsg
, " ");
1086 for (i
= 0; i
< 16; i
++)
1087 sprintf(logmsg
+strlen(logmsg
), "%02x", session_id
[i
]);
1091 supported_ciphers_mask
= GET_32BIT(pktin
.body
+12+i
+j
);
1092 supported_auths_mask
= GET_32BIT(pktin
.body
+16+i
+j
);
1095 MD5Update(&md5c
, keystr2
, hostkey
.bytes
);
1096 MD5Update(&md5c
, keystr1
, servkey
.bytes
);
1097 MD5Update(&md5c
, pktin
.body
, 8);
1098 MD5Final(session_id
, &md5c
);
1100 for (i
=0; i
<32; i
++)
1101 session_key
[i
] = random_byte();
1103 len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
1105 rsabuf
= malloc(len
);
1107 fatalbox("Out of memory");
1110 * Verify the host key.
1114 * First format the key into a string.
1116 int len
= rsastr_len(&hostkey
);
1117 char *keystr
= malloc(len
);
1119 fatalbox("Out of memory");
1120 rsastr_fmt(keystr
, &hostkey
);
1121 verify_ssh_host_key(savedhost
, keystr
);
1125 for (i
=0; i
<32; i
++) {
1126 rsabuf
[i
] = session_key
[i
];
1128 rsabuf
[i
] ^= session_id
[i
];
1131 if (hostkey
.bytes
> servkey
.bytes
) {
1132 rsaencrypt(rsabuf
, 32, &servkey
);
1133 rsaencrypt(rsabuf
, servkey
.bytes
, &hostkey
);
1135 rsaencrypt(rsabuf
, 32, &hostkey
);
1136 rsaencrypt(rsabuf
, hostkey
.bytes
, &servkey
);
1139 logevent("Encrypted session key");
1141 cipher_type
= cfg
.cipher
== CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH
:
1142 cfg
.cipher
== CIPHER_DES ? SSH_CIPHER_DES
:
1144 if ((supported_ciphers_mask
& (1 << cipher_type
)) == 0) {
1145 c_write("Selected cipher not supported, falling back to 3DES\r\n", 53);
1146 cipher_type
= SSH_CIPHER_3DES
;
1148 switch (cipher_type
) {
1149 case SSH_CIPHER_3DES
: logevent("Using 3DES encryption"); break;
1150 case SSH_CIPHER_DES
: logevent("Using single-DES encryption"); break;
1151 case SSH_CIPHER_BLOWFISH
: logevent("Using Blowfish encryption"); break;
1154 send_packet(SSH1_CMSG_SESSION_KEY
,
1155 PKT_CHAR
, cipher_type
,
1156 PKT_DATA
, cookie
, 8,
1157 PKT_CHAR
, (len
*8) >> 8, PKT_CHAR
, (len
*8) & 0xFF,
1158 PKT_DATA
, rsabuf
, len
,
1162 logevent("Trying to enable encryption...");
1166 cipher
= cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish
:
1167 cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
1169 cipher
->sesskey(session_key
);
1173 if (pktin
.type
!= SSH1_SMSG_SUCCESS
)
1174 fatalbox("Encryption not successfully enabled");
1176 logevent("Successfully started encryption");
1180 static char username
[100];
1183 if ((flags
& FLAG_CONNECTION
) && !*cfg
.username
) {
1184 c_write("login as: ", 10);
1186 crWaitUntil(!ispkt
);
1187 while (inlen
--) switch (c
= *in
++) {
1194 c_write("\b \b", 3);
1200 c_write("\b \b", 3);
1209 if (((c
>= ' ' && c
<= '~') ||
1210 ((unsigned char)c
>= 160)) && pos
< 40) {
1211 username
[pos
++] = c
;
1218 username
[strcspn(username
, "\n\r")] = '\0';
1221 strncpy(username
, cfg
.username
, 99);
1222 username
[99] = '\0';
1223 if (flags
& FLAG_VERBOSE
) {
1224 sprintf(stuff
, "Sent username \"%s\".\r\n", username
);
1225 c_write(stuff
, strlen(stuff
));
1229 send_packet(SSH1_CMSG_USER
, PKT_STR
, username
, PKT_END
);
1231 char userlog
[20+sizeof(username
)];
1232 sprintf(userlog
, "Sent username \"%s\"", username
);
1239 tried_publickey
= 0;
1241 while (pktin
.type
== SSH1_SMSG_FAILURE
) {
1242 static char password
[100];
1245 static int pwpkt_type
;
1247 * Show password prompt, having first obtained it via a TIS
1248 * or CryptoCard exchange if we're doing TIS or CryptoCard
1251 pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
1252 if (agent_exists()) {
1254 * Attempt RSA authentication using Pageant.
1256 static unsigned char request
[5], *response
, *p
;
1257 static int responselen
;
1258 static int i
, nkeys
;
1259 static int authed
= FALSE
;
1262 logevent("Pageant is running. Requesting keys.");
1264 /* Request the keys held by the agent. */
1265 PUT_32BIT(request
, 1);
1266 request
[4] = SSH_AGENTC_REQUEST_RSA_IDENTITIES
;
1267 agent_query(request
, 5, &r
, &responselen
);
1268 response
= (unsigned char *)r
;
1271 nkeys
= GET_32BIT(p
); p
+= 4;
1272 { char buf
[64]; sprintf(buf
, "Pageant has %d keys", nkeys
);
1274 for (i
= 0; i
< nkeys
; i
++) {
1275 static struct RSAKey key
;
1276 static Bignum challenge
;
1277 static char *commentp
;
1278 static int commentlen
;
1280 { char buf
[64]; sprintf(buf
, "Trying Pageant key #%d", i
);
1283 p
+= ssh1_read_bignum(p
, &key
.exponent
);
1284 p
+= ssh1_read_bignum(p
, &key
.modulus
);
1285 commentlen
= GET_32BIT(p
); p
+= 4;
1286 commentp
= p
; p
+= commentlen
;
1287 send_packet(SSH1_CMSG_AUTH_RSA
,
1288 PKT_BIGNUM
, key
.modulus
, PKT_END
);
1290 if (pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
) {
1291 logevent("Key refused");
1294 logevent("Received RSA challenge");
1295 ssh1_read_bignum(pktin
.body
, &challenge
);
1297 char *agentreq
, *q
, *ret
;
1299 len
= 1 + 4; /* message type, bit count */
1300 len
+= ssh1_bignum_length(key
.exponent
);
1301 len
+= ssh1_bignum_length(key
.modulus
);
1302 len
+= ssh1_bignum_length(challenge
);
1303 len
+= 16; /* session id */
1304 len
+= 4; /* response format */
1305 agentreq
= malloc(4 + len
);
1306 PUT_32BIT(agentreq
, len
);
1308 *q
++ = SSH_AGENTC_RSA_CHALLENGE
;
1309 PUT_32BIT(q
, ssh1_bignum_bitcount(key
.modulus
));
1311 q
+= ssh1_write_bignum(q
, key
.exponent
);
1312 q
+= ssh1_write_bignum(q
, key
.modulus
);
1313 q
+= ssh1_write_bignum(q
, challenge
);
1314 memcpy(q
, session_id
, 16); q
+= 16;
1315 PUT_32BIT(q
, 1); /* response format */
1316 agent_query(agentreq
, len
+4, &ret
, &retlen
);
1319 if (ret
[4] == SSH_AGENT_RSA_RESPONSE
) {
1320 logevent("Sending Pageant's response");
1321 send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE
,
1322 PKT_DATA
, ret
+5, 16, PKT_END
);
1325 if (pktin
.type
== SSH1_SMSG_SUCCESS
) {
1326 logevent("Pageant's response accepted");
1327 c_write("Authenticated using RSA key \"",
1329 c_write(commentp
, commentlen
);
1330 c_write("\" from agent\r\n", 14);
1333 logevent("Pageant's response not accepted");
1335 logevent("Pageant failed to answer challenge");
1339 logevent("No reply received from Pageant");
1342 freebn(key
.exponent
);
1343 freebn(key
.modulus
);
1352 if (*cfg
.keyfile
&& !tried_publickey
)
1353 pwpkt_type
= SSH1_CMSG_AUTH_RSA
;
1355 if (pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
&& !FLAG_WINDOWED
) {
1357 sprintf(prompt
, "%s@%s's password: ", cfg
.username
, savedhost
);
1358 if (!ssh_get_password(prompt
, password
, sizeof(password
))) {
1360 * get_password failed to get a password (for
1361 * example because one was supplied on the command
1362 * line which has already failed to work).
1365 logevent("No more passwords to try");
1366 ssh_state
= SSH_STATE_CLOSED
;
1371 if (pktin
.type
== SSH1_SMSG_FAILURE
&&
1373 (supported_auths_mask
& (1<<SSH1_AUTH_TIS
))) {
1374 pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
1375 logevent("Requested TIS authentication");
1376 send_packet(SSH1_CMSG_AUTH_TIS
, PKT_END
);
1378 if (pktin
.type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
1379 logevent("TIS authentication declined");
1380 c_write("TIS authentication refused.\r\n", 29);
1382 int challengelen
= ((pktin
.body
[0] << 24) |
1383 (pktin
.body
[1] << 16) |
1384 (pktin
.body
[2] << 8) |
1386 logevent("Received TIS challenge");
1387 c_write(pktin
.body
+4, challengelen
);
1390 if (pktin
.type
== SSH1_SMSG_FAILURE
&&
1392 (supported_auths_mask
& (1<<SSH1_AUTH_CCARD
))) {
1393 pwpkt_type
= SSH1_CMSG_AUTH_CCARD_RESPONSE
;
1394 logevent("Requested CryptoCard authentication");
1395 send_packet(SSH1_CMSG_AUTH_CCARD
, PKT_END
);
1397 if (pktin
.type
!= SSH1_SMSG_AUTH_CCARD_CHALLENGE
) {
1398 logevent("CryptoCard authentication declined");
1399 c_write("CryptoCard authentication refused.\r\n", 29);
1401 int challengelen
= ((pktin
.body
[0] << 24) |
1402 (pktin
.body
[1] << 16) |
1403 (pktin
.body
[2] << 8) |
1405 logevent("Received CryptoCard challenge");
1406 c_write(pktin
.body
+4, challengelen
);
1407 c_write("\r\nResponse : ", 13);
1410 if (pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
)
1411 c_write("password: ", 10);
1412 if (pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
1413 if (flags
& FLAG_VERBOSE
)
1414 c_write("Trying public key authentication.\r\n", 35);
1415 if (!rsakey_encrypted(cfg
.keyfile
)) {
1416 if (flags
& FLAG_VERBOSE
)
1417 c_write("No passphrase required.\r\n", 25);
1420 c_write("passphrase: ", 12);
1425 crWaitUntil(!ispkt
);
1426 while (inlen
--) switch (c
= *in
++) {
1443 if (((c
>= ' ' && c
<= '~') ||
1444 ((unsigned char)c
>= 160)) && pos
< sizeof(password
))
1445 password
[pos
++] = c
;
1454 if (pwpkt_type
== SSH1_CMSG_AUTH_RSA
) {
1456 * Try public key authentication with the specified
1459 static struct RSAKey pubkey
;
1460 static Bignum challenge
, response
;
1462 static unsigned char buffer
[32];
1464 tried_publickey
= 1;
1465 i
= loadrsakey(cfg
.keyfile
, &pubkey
, password
);
1467 c_write("Couldn't load public key from ", 30);
1468 c_write(cfg
.keyfile
, strlen(cfg
.keyfile
));
1469 c_write(".\r\n", 3);
1470 continue; /* go and try password */
1473 c_write("Wrong passphrase.\r\n", 19);
1474 tried_publickey
= 0;
1475 continue; /* try again */
1479 * Send a public key attempt.
1481 send_packet(SSH1_CMSG_AUTH_RSA
,
1482 PKT_BIGNUM
, pubkey
.modulus
, PKT_END
);
1485 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1486 if (flags
& FLAG_VERBOSE
)
1487 c_write("Server refused our public key.\r\n", 32);
1488 continue; /* go and try password */
1490 if (pktin
.type
!= SSH1_SMSG_AUTH_RSA_CHALLENGE
)
1491 fatalbox("Bizarre response to offer of public key");
1492 ssh1_read_bignum(pktin
.body
, &challenge
);
1493 response
= rsadecrypt(challenge
, &pubkey
);
1494 freebn(pubkey
.private_exponent
); /* burn the evidence */
1496 for (i
= 0; i
< 32; i
+= 2) {
1497 buffer
[i
] = response
[16-i
/2] >> 8;
1498 buffer
[i
+1] = response
[16-i
/2] & 0xFF;
1502 MD5Update(&md5c
, buffer
, 32);
1503 MD5Update(&md5c
, session_id
, 16);
1504 MD5Final(buffer
, &md5c
);
1506 send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE
,
1507 PKT_DATA
, buffer
, 16, PKT_END
);
1510 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1511 if (flags
& FLAG_VERBOSE
)
1512 c_write("Failed to authenticate with our public key.\r\n",
1514 continue; /* go and try password */
1515 } else if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1516 fatalbox("Bizarre response to RSA authentication response");
1519 break; /* we're through! */
1521 send_packet(pwpkt_type
, PKT_STR
, password
, PKT_END
);
1523 logevent("Sent password");
1524 memset(password
, 0, strlen(password
));
1526 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1527 if (flags
& FLAG_VERBOSE
)
1528 c_write("Access denied\r\n", 15);
1529 logevent("Authentication refused");
1530 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1531 logevent("Received disconnect request");
1532 ssh_state
= SSH_STATE_CLOSED
;
1534 } else if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1535 fatalbox("Strange packet received, type %d", pktin
.type
);
1539 logevent("Authentication successful");
1544 static void ssh1_protocol(unsigned char *in
, int inlen
, int ispkt
) {
1549 while (!do_ssh1_login(in
, inlen
, ispkt
)) {
1552 if (ssh_state
== SSH_STATE_CLOSED
)
1555 if (cfg
.agentfwd
&& agent_exists()) {
1556 logevent("Requesting agent forwarding");
1557 send_packet(SSH1_CMSG_AGENT_REQUEST_FORWARDING
, PKT_END
);
1558 do { crReturnV
; } while (!ispkt
);
1559 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1560 fatalbox("Protocol confusion");
1561 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1562 logevent("Agent forwarding refused");
1564 logevent("Agent forwarding enabled");
1568 send_packet(SSH1_CMSG_REQUEST_PTY
,
1569 PKT_STR
, cfg
.termtype
,
1570 PKT_INT
, rows
, PKT_INT
, cols
,
1571 PKT_INT
, 0, PKT_INT
, 0,
1574 ssh_state
= SSH_STATE_INTERMED
;
1575 do { crReturnV
; } while (!ispkt
);
1576 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1577 fatalbox("Protocol confusion");
1578 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1579 c_write("Server refused to allocate pty\r\n", 32);
1581 logevent("Allocated pty");
1584 if (*cfg
.remote_cmd
)
1585 send_packet(SSH1_CMSG_EXEC_CMD
, PKT_STR
, cfg
.remote_cmd
, PKT_END
);
1587 send_packet(SSH1_CMSG_EXEC_SHELL
, PKT_END
);
1588 logevent("Started session");
1590 ssh_state
= SSH_STATE_SESSION
;
1595 ssh_channels
= newtree234(ssh_channelcmp
);
1599 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
1600 pktin
.type
== SSH1_SMSG_STDERR_DATA
) {
1601 long len
= GET_32BIT(pktin
.body
);
1602 c_write(pktin
.body
+4, len
);
1603 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1604 ssh_state
= SSH_STATE_CLOSED
;
1605 logevent("Received disconnect request");
1606 } else if (pktin
.type
== SSH1_SMSG_AGENT_OPEN
) {
1607 /* Remote side is trying to open a channel to talk to our
1608 * agent. Give them back a local channel number. */
1610 struct ssh_channel
*c
;
1612 for (c
= first234(ssh_channels
, &e
); c
; c
= next234(&e
)) {
1614 break; /* found a free number */
1617 c
= malloc(sizeof(struct ssh_channel
));
1618 c
->remoteid
= GET_32BIT(pktin
.body
);
1621 c
->type
= SSH1_SMSG_AGENT_OPEN
; /* identify channel type */
1622 add234(ssh_channels
, c
);
1623 send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION
,
1624 PKT_INT
, c
->remoteid
, PKT_INT
, c
->localid
,
1626 } else if (pktin
.type
== SSH1_MSG_CHANNEL_CLOSE
||
1627 pktin
.type
== SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION
) {
1628 /* Remote side closes a channel. */
1629 unsigned i
= GET_32BIT(pktin
.body
);
1630 struct ssh_channel
*c
;
1631 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
1634 closetype
= (pktin
.type
== SSH1_MSG_CHANNEL_CLOSE ?
1 : 2);
1635 send_packet(pktin
.type
, PKT_INT
, c
->remoteid
, PKT_END
);
1636 c
->closes
|= closetype
;
1637 if (c
->closes
== 3) {
1638 del234(ssh_channels
, c
);
1642 } else if (pktin
.type
== SSH1_MSG_CHANNEL_DATA
) {
1643 /* Data sent down one of our channels. */
1644 int i
= GET_32BIT(pktin
.body
);
1645 int len
= GET_32BIT(pktin
.body
+4);
1646 unsigned char *p
= pktin
.body
+8;
1647 struct ssh_channel
*c
;
1648 c
= find234(ssh_channels
, &i
, ssh_channelfind
);
1651 case SSH1_SMSG_AGENT_OPEN
:
1652 /* Data for an agent message. Buffer it. */
1654 if (c
->u
.a
.lensofar
< 4) {
1655 int l
= min(4 - c
->u
.a
.lensofar
, len
);
1656 memcpy(c
->u
.a
.msglen
+ c
->u
.a
.lensofar
, p
, l
);
1657 p
+= l
; len
-= l
; c
->u
.a
.lensofar
+= l
;
1659 if (c
->u
.a
.lensofar
== 4) {
1660 c
->u
.a
.totallen
= 4 + GET_32BIT(c
->u
.a
.msglen
);
1661 c
->u
.a
.message
= malloc(c
->u
.a
.totallen
);
1662 memcpy(c
->u
.a
.message
, c
->u
.a
.msglen
, 4);
1664 if (c
->u
.a
.lensofar
>= 4 && len
> 0) {
1665 int l
= min(c
->u
.a
.totallen
- c
->u
.a
.lensofar
, len
);
1666 memcpy(c
->u
.a
.message
+ c
->u
.a
.lensofar
, p
, l
);
1667 p
+= l
; len
-= l
; c
->u
.a
.lensofar
+= l
;
1669 if (c
->u
.a
.lensofar
== c
->u
.a
.totallen
) {
1670 void *reply
, *sentreply
;
1672 agent_query(c
->u
.a
.message
, c
->u
.a
.totallen
,
1677 /* Fake SSH_AGENT_FAILURE. */
1678 sentreply
= "\0\0\0\1\5";
1681 send_packet(SSH1_MSG_CHANNEL_DATA
,
1682 PKT_INT
, c
->remoteid
,
1684 PKT_DATA
, sentreply
, replylen
,
1688 free(c
->u
.a
.message
);
1689 c
->u
.a
.lensofar
= 0;
1695 } else if (pktin
.type
== SSH1_SMSG_SUCCESS
) {
1696 /* may be from EXEC_SHELL on some servers */
1697 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1698 /* may be from EXEC_SHELL on some servers
1699 * if no pty is available or in other odd cases. Ignore */
1700 } else if (pktin
.type
== SSH1_SMSG_EXIT_STATUS
) {
1701 send_packet(SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
1703 fatalbox("Strange packet received: type %d", pktin
.type
);
1706 send_packet(SSH1_CMSG_STDIN_DATA
,
1707 PKT_INT
, inlen
, PKT_DATA
, in
, inlen
, PKT_END
);
1715 * Utility routine for decoding comma-separated strings in KEXINIT.
1717 int in_commasep_string(char *needle
, char *haystack
, int haylen
) {
1718 int needlen
= strlen(needle
);
1721 * Is it at the start of the string?
1723 if (haylen
>= needlen
&& /* haystack is long enough */
1724 !memcmp(needle
, haystack
, needlen
) && /* initial match */
1725 (haylen
== needlen
|| haystack
[needlen
] == ',')
1726 /* either , or EOS follows */
1730 * If not, search for the next comma and resume after that.
1731 * If no comma found, terminate.
1733 while (haylen
> 0 && *haystack
!= ',')
1734 haylen
--, haystack
++;
1737 haylen
--, haystack
++; /* skip over comma itself */
1742 * SSH2 key creation method.
1744 void ssh2_mkkey(Bignum K
, char *H
, char chr
, char *keyspace
) {
1746 /* First 20 bytes. */
1749 SHA_Bytes(&s
, H
, 20);
1750 SHA_Bytes(&s
, &chr
, 1);
1751 SHA_Bytes(&s
, H
, 20);
1752 SHA_Final(&s
, keyspace
);
1753 /* Next 20 bytes. */
1756 SHA_Bytes(&s
, H
, 20);
1757 SHA_Bytes(&s
, keyspace
, 20);
1758 SHA_Final(&s
, keyspace
+20);
1762 * Handle the SSH2 transport layer.
1764 static int do_ssh2_transport(unsigned char *in
, int inlen
, int ispkt
)
1768 static Bignum e
, f
, K
;
1769 static struct ssh_cipher
*cscipher_tobe
= NULL
;
1770 static struct ssh_cipher
*sccipher_tobe
= NULL
;
1771 static struct ssh_mac
*csmac_tobe
= NULL
;
1772 static struct ssh_mac
*scmac_tobe
= NULL
;
1773 static struct ssh_compress
*cscomp_tobe
= NULL
;
1774 static struct ssh_compress
*sccomp_tobe
= NULL
;
1775 static char *hostkeydata
, *sigdata
, *keystr
;
1776 static int hostkeylen
, siglen
;
1777 static unsigned char exchange_hash
[20];
1778 static unsigned char keyspace
[40];
1785 * Construct and send our key exchange packet.
1787 ssh2_pkt_init(SSH2_MSG_KEXINIT
);
1788 for (i
= 0; i
< 16; i
++)
1789 ssh2_pkt_addbyte((unsigned char)random_byte());
1790 /* List key exchange algorithms. */
1791 ssh2_pkt_addstring_start();
1792 for (i
= 0; i
< lenof(kex_algs
); i
++) {
1793 ssh2_pkt_addstring_str(kex_algs
[i
]->name
);
1794 if (i
< lenof(kex_algs
)-1)
1795 ssh2_pkt_addstring_str(",");
1797 /* List server host key algorithms. */
1798 ssh2_pkt_addstring_start();
1799 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
1800 ssh2_pkt_addstring_str(hostkey_algs
[i
]->name
);
1801 if (i
< lenof(hostkey_algs
)-1)
1802 ssh2_pkt_addstring_str(",");
1804 /* List client->server encryption algorithms. */
1805 ssh2_pkt_addstring_start();
1806 for (i
= 0; i
< lenof(ciphers
); i
++) {
1807 ssh2_pkt_addstring_str(ciphers
[i
]->name
);
1808 if (i
< lenof(ciphers
)-1)
1809 ssh2_pkt_addstring_str(",");
1811 /* List server->client encryption algorithms. */
1812 ssh2_pkt_addstring_start();
1813 for (i
= 0; i
< lenof(ciphers
); i
++) {
1814 ssh2_pkt_addstring_str(ciphers
[i
]->name
);
1815 if (i
< lenof(ciphers
)-1)
1816 ssh2_pkt_addstring_str(",");
1818 /* List client->server MAC algorithms. */
1819 ssh2_pkt_addstring_start();
1820 for (i
= 0; i
< lenof(macs
); i
++) {
1821 ssh2_pkt_addstring_str(macs
[i
]->name
);
1822 if (i
< lenof(macs
)-1)
1823 ssh2_pkt_addstring_str(",");
1825 /* List server->client MAC algorithms. */
1826 ssh2_pkt_addstring_start();
1827 for (i
= 0; i
< lenof(macs
); i
++) {
1828 ssh2_pkt_addstring_str(macs
[i
]->name
);
1829 if (i
< lenof(macs
)-1)
1830 ssh2_pkt_addstring_str(",");
1832 /* List client->server compression algorithms. */
1833 ssh2_pkt_addstring_start();
1834 for (i
= 0; i
< lenof(compressions
); i
++) {
1835 ssh2_pkt_addstring_str(compressions
[i
]->name
);
1836 if (i
< lenof(compressions
)-1)
1837 ssh2_pkt_addstring_str(",");
1839 /* List server->client compression algorithms. */
1840 ssh2_pkt_addstring_start();
1841 for (i
= 0; i
< lenof(compressions
); i
++) {
1842 ssh2_pkt_addstring_str(compressions
[i
]->name
);
1843 if (i
< lenof(compressions
)-1)
1844 ssh2_pkt_addstring_str(",");
1846 /* List client->server languages. Empty list. */
1847 ssh2_pkt_addstring_start();
1848 /* List server->client languages. Empty list. */
1849 ssh2_pkt_addstring_start();
1850 /* First KEX packet does _not_ follow, because we're not that brave. */
1851 ssh2_pkt_addbool(FALSE
);
1853 ssh2_pkt_adduint32(0);
1854 sha_string(&exhash
, pktout
.data
+5, pktout
.length
-5);
1857 if (!ispkt
) crWaitUntil(ispkt
);
1858 sha_string(&exhash
, pktin
.data
+5, pktin
.length
-5);
1861 * Now examine the other side's KEXINIT to see what we're up
1864 if (pktin
.type
!= SSH2_MSG_KEXINIT
) {
1865 fatalbox("expected key exchange packet from server");
1867 kex
= NULL
; hostkey
= NULL
; cscipher_tobe
= NULL
; sccipher_tobe
= NULL
;
1868 csmac_tobe
= NULL
; scmac_tobe
= NULL
; cscomp_tobe
= NULL
; sccomp_tobe
= NULL
;
1869 pktin
.savedpos
+= 16; /* skip garbage cookie */
1870 ssh2_pkt_getstring(&str
, &len
); /* key exchange algorithms */
1871 for (i
= 0; i
< lenof(kex_algs
); i
++) {
1872 if (in_commasep_string(kex_algs
[i
]->name
, str
, len
)) {
1877 ssh2_pkt_getstring(&str
, &len
); /* host key algorithms */
1878 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
1879 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
1880 hostkey
= hostkey_algs
[i
];
1884 ssh2_pkt_getstring(&str
, &len
); /* client->server cipher */
1885 for (i
= 0; i
< lenof(ciphers
); i
++) {
1886 if (in_commasep_string(ciphers
[i
]->name
, str
, len
)) {
1887 cscipher_tobe
= ciphers
[i
];
1891 ssh2_pkt_getstring(&str
, &len
); /* server->client cipher */
1892 for (i
= 0; i
< lenof(ciphers
); i
++) {
1893 if (in_commasep_string(ciphers
[i
]->name
, str
, len
)) {
1894 sccipher_tobe
= ciphers
[i
];
1898 ssh2_pkt_getstring(&str
, &len
); /* client->server mac */
1899 for (i
= 0; i
< lenof(macs
); i
++) {
1900 if (in_commasep_string(macs
[i
]->name
, str
, len
)) {
1901 csmac_tobe
= macs
[i
];
1905 ssh2_pkt_getstring(&str
, &len
); /* server->client mac */
1906 for (i
= 0; i
< lenof(macs
); i
++) {
1907 if (in_commasep_string(macs
[i
]->name
, str
, len
)) {
1908 scmac_tobe
= macs
[i
];
1912 ssh2_pkt_getstring(&str
, &len
); /* client->server compression */
1913 for (i
= 0; i
< lenof(compressions
); i
++) {
1914 if (in_commasep_string(compressions
[i
]->name
, str
, len
)) {
1915 cscomp_tobe
= compressions
[i
];
1919 ssh2_pkt_getstring(&str
, &len
); /* server->client compression */
1920 for (i
= 0; i
< lenof(compressions
); i
++) {
1921 if (in_commasep_string(compressions
[i
]->name
, str
, len
)) {
1922 sccomp_tobe
= compressions
[i
];
1928 * Currently we only support Diffie-Hellman and DSS, so let's
1929 * bomb out if those aren't selected.
1931 if (kex
!= &ssh_diffiehellman
|| hostkey
!= &ssh_dss
)
1932 fatalbox("internal fault: chaos in SSH 2 transport layer");
1935 * Now we begin the fun. Generate and send e for Diffie-Hellman.
1938 ssh2_pkt_init(SSH2_MSG_KEXDH_INIT
);
1943 if (pktin
.type
!= SSH2_MSG_KEXDH_REPLY
) {
1944 fatalbox("expected key exchange packet from server");
1946 ssh2_pkt_getstring(&hostkeydata
, &hostkeylen
);
1947 f
= ssh2_pkt_getmp();
1948 ssh2_pkt_getstring(&sigdata
, &siglen
);
1952 sha_string(&exhash
, hostkeydata
, hostkeylen
);
1953 sha_mpint(&exhash
, e
);
1954 sha_mpint(&exhash
, f
);
1955 sha_mpint(&exhash
, K
);
1956 SHA_Final(&exhash
, exchange_hash
);
1959 debug(("Exchange hash is:\r\n"));
1960 for (i
= 0; i
< 20; i
++)
1961 debug((" %02x", exchange_hash
[i
]));
1965 hostkey
->setkey(hostkeydata
, hostkeylen
);
1966 if (!hostkey
->verifysig(sigdata
, siglen
, exchange_hash
, 20))
1967 fatalbox("Server failed host key check");
1970 * Expect SSH2_MSG_NEWKEYS from server.
1973 if (pktin
.type
!= SSH2_MSG_NEWKEYS
)
1974 fatalbox("expected new-keys packet from server");
1977 * Authenticate remote host: verify host key. (We've already
1978 * checked the signature of the exchange hash.)
1980 keystr
= hostkey
->fmtkey();
1981 verify_ssh_host_key(savedhost
, keystr
);
1985 * Send SSH2_MSG_NEWKEYS.
1987 ssh2_pkt_init(SSH2_MSG_NEWKEYS
);
1991 * Create and initialise session keys.
1993 cscipher
= cscipher_tobe
;
1994 sccipher
= sccipher_tobe
;
1997 cscomp
= cscomp_tobe
;
1998 sccomp
= sccomp_tobe
;
2000 * Set IVs after keys.
2002 ssh2_mkkey(K
, exchange_hash
, 'C', keyspace
); cscipher
->setcskey(keyspace
);
2003 ssh2_mkkey(K
, exchange_hash
, 'D', keyspace
); cscipher
->setsckey(keyspace
);
2004 ssh2_mkkey(K
, exchange_hash
, 'A', keyspace
); cscipher
->setcsiv(keyspace
);
2005 ssh2_mkkey(K
, exchange_hash
, 'B', keyspace
); sccipher
->setsciv(keyspace
);
2006 ssh2_mkkey(K
, exchange_hash
, 'E', keyspace
); csmac
->setcskey(keyspace
);
2007 ssh2_mkkey(K
, exchange_hash
, 'F', keyspace
); scmac
->setsckey(keyspace
);
2010 * Now we're encrypting. Begin returning 1 to the protocol main
2011 * function so that other things can run on top of the
2012 * transport. If we ever see a KEXINIT, we must go back to the
2017 } while (!(ispkt
&& pktin
.type
== SSH2_MSG_KEXINIT
));
2018 goto begin_key_exchange
;
2024 * Handle the SSH2 userauth and connection layers.
2026 static void do_ssh2_authconn(unsigned char *in
, int inlen
, int ispkt
)
2028 static unsigned long remote_winsize
;
2029 static unsigned long remote_maxpkt
;
2034 * Request userauth protocol, and await a response to it.
2036 ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST
);
2037 ssh2_pkt_addstring("ssh-userauth");
2039 crWaitUntilV(ispkt
);
2040 if (pktin
.type
!= SSH2_MSG_SERVICE_ACCEPT
)
2041 fatalbox("Server refused user authentication protocol");
2044 * FIXME: currently we support only password authentication.
2045 * (This places us technically in violation of the SSH2 spec.
2046 * We must fix this.)
2050 * Get a username and a password.
2052 static char username
[100];
2053 static char password
[100];
2057 if ((flags
& FLAG_CONNECTION
) && !*cfg
.username
) {
2058 c_write("login as: ", 10);
2060 crWaitUntilV(!ispkt
);
2061 while (inlen
--) switch (c
= *in
++) {
2068 c_write("\b \b", 3);
2074 c_write("\b \b", 3);
2083 if (((c
>= ' ' && c
<= '~') ||
2084 ((unsigned char)c
>= 160)) && pos
< 40) {
2085 username
[pos
++] = c
;
2092 username
[strcspn(username
, "\n\r")] = '\0';
2095 strncpy(username
, cfg
.username
, 99);
2096 username
[99] = '\0';
2097 if (flags
& FLAG_VERBOSE
) {
2098 sprintf(stuff
, "Using username \"%s\".\r\n", username
);
2099 c_write(stuff
, strlen(stuff
));
2103 if (!(flags
& FLAG_WINDOWED
)) {
2105 sprintf(prompt
, "%s@%s's password: ", cfg
.username
, savedhost
);
2106 if (!ssh_get_password(prompt
, password
, sizeof(password
))) {
2108 * get_password failed to get a password (for
2109 * example because one was supplied on the command
2110 * line which has already failed to work).
2113 logevent("No more passwords to try");
2114 ssh_state
= SSH_STATE_CLOSED
;
2118 c_write("password: ", 10);
2122 crWaitUntilV(!ispkt
);
2123 while (inlen
--) switch (c
= *in
++) {
2140 if (((c
>= ' ' && c
<= '~') ||
2141 ((unsigned char)c
>= 160)) && pos
< 40)
2142 password
[pos
++] = c
;
2149 ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST
);
2150 ssh2_pkt_addstring(username
);
2151 ssh2_pkt_addstring("ssh-connection"); /* service requested */
2152 ssh2_pkt_addstring("password");
2153 ssh2_pkt_addbool(FALSE
);
2154 ssh2_pkt_addstring(password
);
2157 crWaitUntilV(ispkt
);
2158 if (pktin
.type
!= SSH2_MSG_USERAUTH_SUCCESS
) {
2159 c_write("Access denied\r\n", 15);
2160 logevent("Authentication refused");
2166 * Now we're authenticated for the connection protocol. The
2167 * connection protocol will automatically have started at this
2168 * point; there's no need to send SERVICE_REQUEST.
2172 * So now create a channel with a session in it.
2174 mainchan
= malloc(sizeof(struct ssh_channel
));
2175 mainchan
->localid
= 100; /* as good as any */
2176 ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN
);
2177 ssh2_pkt_addstring("session");
2178 ssh2_pkt_adduint32(mainchan
->localid
);
2179 ssh2_pkt_adduint32(0x7FFFFFFFUL
); /* our window size */
2180 ssh2_pkt_adduint32(0x4000UL
); /* our max pkt size */
2182 crWaitUntilV(ispkt
);
2183 if (pktin
.type
!= SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
) {
2184 fatalbox("Server refused to open a session");
2185 /* FIXME: error data comes back in FAILURE packet */
2187 if (ssh2_pkt_getuint32() != mainchan
->localid
) {
2188 fatalbox("Server's channel confirmation cited wrong channel");
2190 mainchan
->remoteid
= ssh2_pkt_getuint32();
2191 mainchan
->u
.v2
.remwindow
= ssh2_pkt_getuint32();
2192 mainchan
->u
.v2
.remmaxpkt
= ssh2_pkt_getuint32();
2193 mainchan
->u
.v2
.outbuffer
= NULL
;
2194 mainchan
->u
.v2
.outbuflen
= mainchan
->u
.v2
.outbufsize
= 0;
2195 logevent("Opened channel for session");
2198 * Now allocate a pty for the session.
2200 ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
2201 ssh2_pkt_adduint32(mainchan
->remoteid
); /* recipient channel */
2202 ssh2_pkt_addstring("pty-req");
2203 ssh2_pkt_addbool(1); /* want reply */
2204 ssh2_pkt_addstring(cfg
.termtype
);
2205 ssh2_pkt_adduint32(cols
);
2206 ssh2_pkt_adduint32(rows
);
2207 ssh2_pkt_adduint32(0); /* pixel width */
2208 ssh2_pkt_adduint32(0); /* pixel height */
2209 ssh2_pkt_addstring_start();
2210 ssh2_pkt_addstring_data("\0", 1); /* TTY_OP_END, no special options */
2213 do { /* FIXME: pay attention to these */
2214 crWaitUntilV(ispkt
);
2215 } while (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2217 if (pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
2218 if (pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
2219 fatalbox("Server got confused by pty request");
2221 c_write("Server refused to allocate pty\r\n", 32);
2223 logevent("Allocated pty");
2229 ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST
);
2230 ssh2_pkt_adduint32(mainchan
->remoteid
); /* recipient channel */
2231 ssh2_pkt_addstring("shell");
2232 ssh2_pkt_addbool(1); /* want reply */
2235 crWaitUntilV(ispkt
);
2236 if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2237 /* FIXME: be able to handle other channels here */
2238 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2239 continue; /* wrong channel */
2240 mainchan
->u
.v2
.remwindow
+= ssh2_pkt_getuint32();
2242 } while (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2243 if (pktin
.type
!= SSH2_MSG_CHANNEL_SUCCESS
) {
2244 if (pktin
.type
!= SSH2_MSG_CHANNEL_FAILURE
) {
2245 fatalbox("Server got confused by shell request");
2247 fatalbox("Server refused to start a shell");
2249 logevent("Started a shell");
2257 static int try_send
;
2261 if (pktin
.type
== SSH2_MSG_CHANNEL_DATA
||
2262 pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
) {
2265 /* FIXME: be able to handle other channels here */
2266 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2267 continue; /* wrong channel */
2268 if (pktin
.type
== SSH2_MSG_CHANNEL_EXTENDED_DATA
&&
2269 ssh2_pkt_getuint32() != SSH2_EXTENDED_DATA_STDERR
)
2270 continue; /* extended but not stderr */
2271 ssh2_pkt_getstring(&data
, &length
);
2273 c_write(data
, length
);
2275 * Enlarge the window again at the remote side,
2276 * just in case it ever runs down and they fail
2277 * to send us any more data.
2279 ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST
);
2280 ssh2_pkt_adduint32(mainchan
->remoteid
);
2281 ssh2_pkt_adduint32(length
);
2284 } else if (pktin
.type
== SSH2_MSG_DISCONNECT
) {
2285 ssh_state
= SSH_STATE_CLOSED
;
2286 logevent("Received disconnect message");
2287 } else if (pktin
.type
== SSH2_MSG_CHANNEL_REQUEST
) {
2288 continue; /* exit status et al; ignore (FIXME?) */
2289 } else if (pktin
.type
== SSH2_MSG_CHANNEL_EOF
) {
2290 continue; /* remote sends EOF; ignore */
2291 } else if (pktin
.type
== SSH2_MSG_CHANNEL_CLOSE
) {
2292 /* FIXME: be able to handle other channels here */
2293 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2294 continue; /* wrong channel */
2295 ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE
);
2296 ssh2_pkt_adduint32(mainchan
->remoteid
);
2298 /* FIXME: mark the channel as closed */
2299 if (1 /* FIXME: "all channels are closed" */) {
2300 logevent("All channels closed. Disconnecting");
2301 ssh2_pkt_init(SSH2_MSG_DISCONNECT
);
2304 continue; /* remote sends close; ignore (FIXME) */
2305 } else if (pktin
.type
== SSH2_MSG_CHANNEL_WINDOW_ADJUST
) {
2306 /* FIXME: be able to handle other channels here */
2307 if (ssh2_pkt_getuint32() != mainchan
->localid
)
2308 continue; /* wrong channel */
2309 mainchan
->u
.v2
.remwindow
+= ssh2_pkt_getuint32();
2312 fatalbox("Strange packet received: type %d", pktin
.type
);
2316 * We have spare data. Add it to the channel buffer.
2318 if (mainchan
->u
.v2
.outbufsize
<
2319 mainchan
->u
.v2
.outbuflen
+ inlen
) {
2320 mainchan
->u
.v2
.outbufsize
=
2321 mainchan
->u
.v2
.outbuflen
+ inlen
+ 1024;
2322 mainchan
->u
.v2
.outbuffer
= srealloc(mainchan
->u
.v2
.outbuffer
,
2323 mainchan
->u
.v2
.outbufsize
);
2325 memcpy(mainchan
->u
.v2
.outbuffer
+ mainchan
->u
.v2
.outbuflen
,
2327 mainchan
->u
.v2
.outbuflen
+= inlen
;
2332 * Try to send data on the channel if we can. (FIXME:
2333 * on _all_ channels.)
2335 while (mainchan
->u
.v2
.remwindow
> 0 &&
2336 mainchan
->u
.v2
.outbuflen
> 0) {
2337 unsigned len
= mainchan
->u
.v2
.remwindow
;
2338 if (len
> mainchan
->u
.v2
.outbuflen
)
2339 len
= mainchan
->u
.v2
.outbuflen
;
2340 if (len
> mainchan
->u
.v2
.remmaxpkt
)
2341 len
= mainchan
->u
.v2
.remmaxpkt
;
2342 ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA
);
2343 ssh2_pkt_adduint32(mainchan
->remoteid
);
2344 ssh2_pkt_addstring_start();
2345 ssh2_pkt_addstring_data(mainchan
->u
.v2
.outbuffer
, len
);
2347 mainchan
->u
.v2
.outbuflen
-= len
;
2348 memmove(mainchan
->u
.v2
.outbuffer
, mainchan
->u
.v2
.outbuffer
+len
,
2349 mainchan
->u
.v2
.outbuflen
);
2350 mainchan
->u
.v2
.remwindow
-= len
;
2359 * Handle the top-level SSH2 protocol.
2361 static void ssh2_protocol(unsigned char *in
, int inlen
, int ispkt
)
2363 if (do_ssh2_transport(in
, inlen
, ispkt
) == 0)
2365 do_ssh2_authconn(in
, inlen
, ispkt
);
2369 * Called to set up the connection. Will arrange for WM_NETEVENT
2370 * messages to be passed to the specified window, whose window
2371 * procedure should then call telnet_msg().
2373 * Returns an error message, or NULL on success.
2375 static char *ssh_init (HWND hwnd
, char *host
, int port
, char **realhost
) {
2379 if(crypto_startup() == 0)
2380 return "Microsoft high encryption pack not installed!";
2383 p
= connect_to_host(host
, port
, realhost
);
2388 return "Protocol initialisation error";
2390 if (hwnd
&& WSAAsyncSelect (s
, hwnd
, WM_NETEVENT
, FD_READ
| FD_CLOSE
) == SOCKET_ERROR
)
2391 switch (WSAGetLastError()) {
2392 case WSAENETDOWN
: return "Network is down";
2393 default: return "WSAAsyncSelect(): unknown error";
2400 * Process a WM_NETEVENT message. Will return 0 if the connection
2401 * has closed, or <0 for a socket error.
2403 static int ssh_msg (WPARAM wParam
, LPARAM lParam
) {
2408 * Because reading less than the whole of the available pending
2409 * data can generate an FD_READ event, we need to allow for the
2410 * possibility that FD_READ may arrive with FD_CLOSE already in
2411 * the queue; so it's possible that we can get here even with s
2412 * invalid. If so, we return 1 and don't worry about it.
2414 if (s
== INVALID_SOCKET
)
2417 if (WSAGETSELECTERROR(lParam
) != 0)
2418 return -WSAGETSELECTERROR(lParam
);
2420 switch (WSAGETSELECTEVENT(lParam
)) {
2423 ret
= recv(s
, buf
, sizeof(buf
), 0);
2424 if (ret
< 0 && WSAGetLastError() == WSAEWOULDBLOCK
)
2426 if (ret
< 0) /* any _other_ error */
2427 return -10000-WSAGetLastError();
2432 ssh_gotdata (buf
, ret
);
2433 if (ssh_state
== SSH_STATE_CLOSED
) {
2440 return 1; /* shouldn't happen, but WTF */
2444 * Called to send data down the Telnet connection.
2446 static void ssh_send (char *buf
, int len
) {
2447 if (s
== INVALID_SOCKET
)
2450 ssh_protocol(buf
, len
, 0);
2454 * Called to set the size of the window from Telnet's POV.
2456 static void ssh_size(void) {
2457 switch (ssh_state
) {
2458 case SSH_STATE_BEFORE_SIZE
:
2459 case SSH_STATE_CLOSED
:
2460 break; /* do nothing */
2461 case SSH_STATE_INTERMED
:
2462 size_needed
= TRUE
; /* buffer for later */
2464 case SSH_STATE_SESSION
:
2466 send_packet(SSH1_CMSG_WINDOW_SIZE
,
2467 PKT_INT
, rows
, PKT_INT
, cols
,
2468 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
2474 * Send Telnet special codes. TS_EOF is useful for `plink', so you
2475 * can send an EOF and collect resulting output (e.g. `plink
2478 static void ssh_special (Telnet_Special code
) {
2479 if (code
== TS_EOF
) {
2480 if (ssh_version
= 1) {
2481 send_packet(SSH1_CMSG_EOF
, PKT_END
);
2483 ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF
);
2484 ssh2_pkt_adduint32(mainchan
->remoteid
);
2494 * Read and decrypt one incoming SSH packet.
2495 * (only used by pSCP)
2497 static void get_packet(void)
2499 unsigned char buf
[4096], *p
;
2506 while ((to_read
= s_rdpkt(&p
, &len
)) > 0) {
2507 if (to_read
> sizeof(buf
)) to_read
= sizeof(buf
);
2508 len
= s_read(buf
, to_read
);
2509 if (len
!= to_read
) {
2521 * Receive a block of data over the SSH link. Block until
2522 * all data is available. Return nr of bytes read (0 if lost connection).
2523 * (only used by pSCP)
2525 int ssh_scp_recv(unsigned char *buf
, int len
)
2527 static int pending_input_len
= 0;
2528 static unsigned char *pending_input_ptr
;
2531 if (pending_input_len
>= to_read
) {
2532 memcpy(buf
, pending_input_ptr
, to_read
);
2533 pending_input_ptr
+= to_read
;
2534 pending_input_len
-= to_read
;
2538 if (pending_input_len
> 0) {
2539 memcpy(buf
, pending_input_ptr
, pending_input_len
);
2540 buf
+= pending_input_len
;
2541 to_read
-= pending_input_len
;
2542 pending_input_len
= 0;
2545 if (s
== INVALID_SOCKET
)
2547 while (to_read
> 0) {
2549 if (s
== INVALID_SOCKET
)
2551 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
) {
2552 int plen
= GET_32BIT(pktin
.body
);
2553 if (plen
<= to_read
) {
2554 memcpy(buf
, pktin
.body
+ 4, plen
);
2558 memcpy(buf
, pktin
.body
+ 4, to_read
);
2559 pending_input_len
= plen
- to_read
;
2560 pending_input_ptr
= pktin
.body
+ 4 + to_read
;
2563 } else if (pktin
.type
== SSH1_SMSG_STDERR_DATA
) {
2564 int plen
= GET_32BIT(pktin
.body
);
2565 fwrite(pktin
.body
+ 4, plen
, 1, stderr
);
2566 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
2567 logevent("Received disconnect request");
2568 } else if (pktin
.type
== SSH1_SMSG_SUCCESS
||
2569 pktin
.type
== SSH1_SMSG_FAILURE
) {
2571 } else if (pktin
.type
== SSH1_SMSG_EXIT_STATUS
) {
2573 sprintf(logbuf
, "Remote exit status: %d", GET_32BIT(pktin
.body
));
2575 send_packet(SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
2576 logevent("Closing connection");
2580 fatalbox("Strange packet received: type %d", pktin
.type
);
2588 * Send a block of data over the SSH link.
2589 * Block until all data is sent.
2590 * (only used by pSCP)
2592 void ssh_scp_send(unsigned char *buf
, int len
)
2594 if (s
== INVALID_SOCKET
)
2596 send_packet(SSH1_CMSG_STDIN_DATA
,
2597 PKT_INT
, len
, PKT_DATA
, buf
, len
, PKT_END
);
2601 * Send an EOF notification to the server.
2602 * (only used by pSCP)
2604 void ssh_scp_send_eof(void)
2606 if (s
== INVALID_SOCKET
)
2608 send_packet(SSH1_CMSG_EOF
, PKT_END
);
2612 * Set up the connection, login on the remote host and
2613 * start execution of a command.
2614 * Returns an error message, or NULL on success.
2615 * (only used by pSCP)
2617 char *ssh_scp_init(char *host
, int port
, char *cmd
, char **realhost
)
2622 if (crypto_startup() == 0)
2623 return "Microsoft high encryption pack not installed!";
2626 p
= connect_to_host(host
, port
, realhost
);
2633 return "Protocol initialisation error";
2635 /* Exchange keys and login */
2638 if (s
== INVALID_SOCKET
)
2639 return "Connection closed by remote host";
2640 } while (!do_ssh1_login(NULL
, 0, 1));
2642 if (ssh_state
== SSH_STATE_CLOSED
) {
2645 return "Session initialisation error";
2648 /* Execute command */
2649 sprintf(buf
, "Sending command: %.100s", cmd
);
2651 send_packet(SSH1_CMSG_EXEC_CMD
, PKT_STR
, cmd
, PKT_END
);
2656 static SOCKET
ssh_socket(void) { return s
; }
2658 static int ssh_sendok(void) { return ssh_send_ok
; }
2660 Backend ssh_backend
= {