18 #define logevent(s) { logevent(s); \
19 if (IS_SCP && (scp_flags & SCP_VERBOSE) != 0) \
20 fprintf(stderr, "%s\n", s); }
22 #define SSH1_MSG_DISCONNECT 1
23 #define SSH1_SMSG_PUBLIC_KEY 2
24 #define SSH1_CMSG_SESSION_KEY 3
25 #define SSH1_CMSG_USER 4
26 #define SSH1_CMSG_AUTH_PASSWORD 9
27 #define SSH1_CMSG_REQUEST_PTY 10
28 #define SSH1_CMSG_WINDOW_SIZE 11
29 #define SSH1_CMSG_EXEC_SHELL 12
30 #define SSH1_CMSG_EXEC_CMD 13
31 #define SSH1_SMSG_SUCCESS 14
32 #define SSH1_SMSG_FAILURE 15
33 #define SSH1_CMSG_STDIN_DATA 16
34 #define SSH1_SMSG_STDOUT_DATA 17
35 #define SSH1_SMSG_STDERR_DATA 18
36 #define SSH1_CMSG_EOF 19
37 #define SSH1_SMSG_EXIT_STATUS 20
38 #define SSH1_CMSG_EXIT_CONFIRMATION 33
39 #define SSH1_MSG_IGNORE 32
40 #define SSH1_MSG_DEBUG 36
41 #define SSH1_CMSG_AUTH_TIS 39
42 #define SSH1_SMSG_AUTH_TIS_CHALLENGE 40
43 #define SSH1_CMSG_AUTH_TIS_RESPONSE 41
45 #define SSH1_AUTH_TIS 5
47 #define SSH2_MSG_DISCONNECT 1
48 #define SSH2_MSG_IGNORE 2
49 #define SSH2_MSG_UNIMPLEMENTED 3
50 #define SSH2_MSG_DEBUG 4
51 #define SSH2_MSG_SERVICE_REQUEST 5
52 #define SSH2_MSG_SERVICE_ACCEPT 6
53 #define SSH2_MSG_KEXINIT 20
54 #define SSH2_MSG_NEWKEYS 21
55 #define SSH2_MSG_KEXDH_INIT 30
56 #define SSH2_MSG_KEXDH_REPLY 31
58 #define GET_32BIT(cp) \
59 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
60 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
61 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
62 ((unsigned long)(unsigned char)(cp)[3]))
64 #define PUT_32BIT(cp, value) { \
65 (cp)[0] = (unsigned char)((value) >> 24); \
66 (cp)[1] = (unsigned char)((value) >> 16); \
67 (cp)[2] = (unsigned char)((value) >> 8); \
68 (cp)[3] = (unsigned char)(value); }
70 enum { PKT_END
, PKT_INT
, PKT_CHAR
, PKT_DATA
, PKT_STR
};
72 /* Coroutine mechanics for the sillier bits of the code */
73 #define crBegin1 static int crLine = 0;
74 #define crBegin2 switch(crLine) { case 0:;
75 #define crBegin crBegin1; crBegin2;
76 #define crFinish(z) } crLine = 0; return (z)
77 #define crFinishV } crLine = 0; return
80 crLine=__LINE__; return (z); case __LINE__:;\
84 crLine=__LINE__; return; case __LINE__:;\
86 #define crStop(z) do{ crLine = 0; return (z); }while(0)
87 #define crStopV do{ crLine = 0; return; }while(0)
88 #define crWaitUntil(c) do { crReturn(0); } while (!(c))
90 extern struct ssh_cipher ssh_3des
;
91 extern struct ssh_cipher ssh_des
;
92 extern struct ssh_cipher ssh_blowfish
;
94 /* for ssh 2; we miss out single-DES because it isn't supported */
95 struct ssh_cipher
*ciphers
[] = { &ssh_3des
, &ssh_blowfish
};
97 extern struct ssh_kex ssh_diffiehellman
;
98 struct ssh_kex
*kex_algs
[] = { &ssh_diffiehellman
};
100 extern struct ssh_hostkey ssh_dss
;
101 struct ssh_hostkey
*hostkey_algs
[] = { &ssh_dss
};
103 extern struct ssh_mac ssh_sha1
;
107 static void nullmac_key(unsigned char *key
) { }
108 static void nullmac_generate(unsigned char *blk
, int len
, unsigned long seq
) { }
109 static int nullmac_verify(unsigned char *blk
, int len
, unsigned long seq
) { return 1; }
110 struct ssh_mac ssh_mac_none
= {
111 nullmac_key
, nullmac_key
, nullmac_generate
, nullmac_verify
, "none", 0
113 struct ssh_mac
*macs
[] = { &ssh_sha1
, &ssh_mac_none
};
115 struct ssh_compress ssh_comp_none
= {
118 struct ssh_compress
*compressions
[] = { &ssh_comp_none
};
120 static SOCKET s
= INVALID_SOCKET
;
122 static unsigned char session_key
[32];
123 static struct ssh_cipher
*cipher
= NULL
;
124 static struct ssh_cipher
*cscipher
= NULL
;
125 static struct ssh_cipher
*sccipher
= NULL
;
126 static struct ssh_mac
*csmac
= NULL
;
127 static struct ssh_mac
*scmac
= NULL
;
128 static struct ssh_compress
*cscomp
= NULL
;
129 static struct ssh_compress
*sccomp
= NULL
;
130 static struct ssh_kex
*kex
= NULL
;
131 static struct ssh_hostkey
*hostkey
= NULL
;
133 int (*ssh_get_password
)(const char *prompt
, char *str
, int maxlen
) = NULL
;
135 static char *savedhost
;
138 SSH_STATE_BEFORE_SIZE
,
142 } ssh_state
= SSH_STATE_BEFORE_SIZE
;
144 static int size_needed
= FALSE
;
146 static void s_write (char *buf
, int len
) {
148 int i
= send (s
, buf
, len
, 0);
152 fatalbox("Lost connection while sending");
159 static int s_read (char *buf
, int len
) {
162 int i
= recv (s
, buf
, len
, 0);
166 len
-= i
, buf
+= i
, ret
+= i
;
173 static void c_write (char *buf
, int len
) {
175 if (len
> 0 && buf
[len
-1] == '\n') len
--;
176 if (len
> 0 && buf
[len
-1] == '\r') len
--;
177 if (len
> 0) { fwrite(buf
, len
, 1, stderr
); fputc('\n', stderr
); }
193 static struct Packet pktin
= { 0, 0, NULL
, NULL
, 0 };
194 static struct Packet pktout
= { 0, 0, NULL
, NULL
, 0 };
196 static void (*ssh_protocol
)(unsigned char *in
, int inlen
, int ispkt
);
197 static void ssh1_protocol(unsigned char *in
, int inlen
, int ispkt
);
198 static void ssh2_protocol(unsigned char *in
, int inlen
, int ispkt
);
199 static void ssh_size(void);
201 static int (*s_rdpkt
)(unsigned char **data
, int *datalen
);
204 * Collect incoming data in the incoming packet buffer.
205 * Decipher and verify the packet when it is completely read.
206 * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets.
207 * Update the *data and *datalen variables.
208 * Return the additional nr of bytes needed, or 0 when
209 * a complete packet is available.
211 static int ssh1_rdpkt(unsigned char **data
, int *datalen
)
213 static long len
, pad
, biglen
, to_read
;
214 static unsigned long realcrc
, gotcrc
;
215 static unsigned char *p
;
225 for (i
= len
= 0; i
< 4; i
++) {
226 while ((*datalen
) == 0)
228 len
= (len
<< 8) + **data
;
229 (*data
)++, (*datalen
)--;
233 if (len
== 0x52656d6f) { /* "Remo"te server has closed ... */
234 len
= 0x300; /* big enough to carry to end */
240 pktin
.length
= len
- 5;
242 if (pktin
.maxlen
< biglen
) {
243 pktin
.maxlen
= biglen
;
244 pktin
.data
= (pktin
.data
== NULL ?
malloc(biglen
+APIEXTRA
) :
245 realloc(pktin
.data
, biglen
+APIEXTRA
));
247 fatalbox("Out of memory");
252 while (to_read
> 0) {
255 while ((*datalen
) == 0)
257 if (chunk
> (*datalen
))
259 memcpy(p
, *data
, chunk
);
267 cipher
->decrypt(pktin
.data
, biglen
);
269 pktin
.type
= pktin
.data
[pad
];
270 pktin
.body
= pktin
.data
+ pad
+ 1;
272 realcrc
= crc32(pktin
.data
, biglen
-4);
273 gotcrc
= GET_32BIT(pktin
.data
+biglen
-4);
274 if (gotcrc
!= realcrc
) {
275 fatalbox("Incorrect CRC received on packet");
278 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
279 pktin
.type
== SSH1_SMSG_STDERR_DATA
||
280 pktin
.type
== SSH1_MSG_DEBUG
||
281 pktin
.type
== SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
282 long strlen
= GET_32BIT(pktin
.body
);
283 if (strlen
+ 4 != pktin
.length
)
284 fatalbox("Received data packet with bogus string length");
287 if (pktin
.type
== SSH1_MSG_DEBUG
) {
288 /* log debug message */
290 int strlen
= GET_32BIT(pktin
.body
);
291 strcpy(buf
, "Remote: ");
292 if (strlen
> 70) strlen
= 70;
293 memcpy(buf
+8, pktin
.body
+4, strlen
);
294 buf
[8+strlen
] = '\0';
297 } else if (pktin
.type
== SSH1_MSG_IGNORE
) {
305 static int ssh2_rdpkt(unsigned char **data
, int *datalen
)
307 static long len
, pad
, payload
, packetlen
, maclen
;
309 static int cipherblk
;
310 static unsigned long incoming_sequence
= 0;
320 cipherblk
= cipher
->blksize
;
326 if (pktin
.maxlen
< cipherblk
) {
327 pktin
.maxlen
= cipherblk
;
328 pktin
.data
= (pktin
.data
== NULL ?
malloc(cipherblk
+APIEXTRA
) :
329 realloc(pktin
.data
, cipherblk
+APIEXTRA
));
331 fatalbox("Out of memory");
335 * Acquire and decrypt the first block of the packet. This will
336 * contain the length and padding details.
338 for (i
= len
= 0; i
< cipherblk
; i
++) {
339 while ((*datalen
) == 0)
340 crReturn(cipherblk
-i
);
341 pktin
.data
[i
] = *(*data
)++;
345 if (!memcmp(pktin
.data
, "Remo", 4)) {/* "Remo"te server has closed ... */
349 debug(("Got initblk:"));
350 for (i
= 0; i
< cipherblk
; i
++)
351 debug((" %02x", (unsigned char)pktin
.data
[i
]));
354 sccipher
->decrypt(pktin
.data
, cipherblk
);
355 debug(("Decrypted initblk:"));
356 for (i
= 0; i
< cipherblk
; i
++)
357 debug((" %02x", (unsigned char)pktin
.data
[i
]));
361 * Now get the length and padding figures.
363 len
= GET_32BIT(pktin
.data
);
367 * This enables us to deduce the payload length.
369 payload
= len
- pad
- 1;
371 pktin
.length
= payload
+ 5;
374 * So now we can work out the total packet length.
377 maclen
= scmac ? scmac
->len
: 0;
380 * Adjust memory allocation if packet is too big.
382 if (pktin
.maxlen
< packetlen
) {
383 pktin
.maxlen
= packetlen
;
384 pktin
.data
= (pktin
.data
== NULL ?
malloc(packetlen
+APIEXTRA
) :
385 realloc(pktin
.data
, packetlen
+APIEXTRA
));
387 fatalbox("Out of memory");
391 * Read and decrypt the remainder of the packet.
393 for (i
= cipherblk
; i
< packetlen
+ maclen
; i
++) {
394 while ((*datalen
) == 0)
395 crReturn(packetlen
+ maclen
- i
);
396 pktin
.data
[i
] = *(*data
)++;
399 /* Decrypt everything _except_ the MAC. */
401 sccipher
->decrypt(pktin
.data
+ cipherblk
, packetlen
- cipherblk
);
403 debug(("Got packet len=%d pad=%d\r\n", len
, pad
));
404 for (i
= 0; i
< packetlen
; i
++)
405 debug((" %02x", (unsigned char)pktin
.data
[i
]));
411 if (scmac
&& !scmac
->verify(pktin
.data
, incoming_sequence
++, len
+4))
412 fatalbox("Incorrect MAC received on packet");
415 pktin
.type
= pktin
.data
[5];
418 * FIXME: handle IGNORE and DEBUG messages.
424 static void ssh_gotdata(unsigned char *data
, int datalen
)
426 while (datalen
> 0) {
427 if ( s_rdpkt(&data
, &datalen
) == 0 ) {
428 ssh_protocol(NULL
, 0, 1);
429 if (ssh_state
== SSH_STATE_CLOSED
) {
437 static void s_wrpkt_start(int type
, int len
) {
440 len
+= 5; /* type and CRC */
444 pktout
.length
= len
-5;
445 if (pktout
.maxlen
< biglen
) {
446 pktout
.maxlen
= biglen
;
448 /* Allocate enough buffer space for extra block
449 * for MS CryptEncrypt() */
450 pktout
.data
= (pktout
.data
== NULL ?
malloc(biglen
+12) :
451 realloc(pktout
.data
, biglen
+12));
453 pktout
.data
= (pktout
.data
== NULL ?
malloc(biglen
+4) :
454 realloc(pktout
.data
, biglen
+4));
457 fatalbox("Out of memory");
461 pktout
.body
= pktout
.data
+4+pad
+1;
464 static void s_wrpkt(void) {
465 int pad
, len
, biglen
, i
;
468 len
= pktout
.length
+ 5; /* type and CRC */
472 pktout
.body
[-1] = pktout
.type
;
473 for (i
=0; i
<pad
; i
++)
474 pktout
.data
[i
+4] = random_byte();
475 crc
= crc32(pktout
.data
+4, biglen
-4);
476 PUT_32BIT(pktout
.data
+biglen
, crc
);
477 PUT_32BIT(pktout
.data
, len
);
480 cipher
->encrypt(pktout
.data
+4, biglen
);
482 s_write(pktout
.data
, biglen
+4);
486 * Construct a packet with the specified contents and
487 * send it to the server.
489 static void send_packet(int pkttype
, ...)
492 unsigned char *p
, *argp
, argchar
;
493 unsigned long argint
;
494 int pktlen
, argtype
, arglen
;
497 va_start(args
, pkttype
);
498 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
501 (void) va_arg(args
, int);
505 (void) va_arg(args
, char);
509 (void) va_arg(args
, unsigned char *);
510 arglen
= va_arg(args
, int);
514 argp
= va_arg(args
, unsigned char *);
515 arglen
= strlen(argp
);
516 pktlen
+= 4 + arglen
;
524 s_wrpkt_start(pkttype
, pktlen
);
527 va_start(args
, pkttype
);
528 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
531 argint
= va_arg(args
, int);
532 PUT_32BIT(p
, argint
);
536 argchar
= va_arg(args
, unsigned char);
541 argp
= va_arg(args
, unsigned char *);
542 arglen
= va_arg(args
, int);
543 memcpy(p
, argp
, arglen
);
547 argp
= va_arg(args
, unsigned char *);
548 arglen
= strlen(argp
);
549 PUT_32BIT(p
, arglen
);
550 memcpy(p
+ 4, argp
, arglen
);
562 * Connect to specified host and port.
563 * Returns an error message, or NULL on success.
564 * Also places the canonical host name into `realhost'.
566 static char *connect_to_host(char *host
, int port
, char **realhost
)
576 savedhost
= malloc(1+strlen(host
));
578 fatalbox("Out of memory");
579 strcpy(savedhost
, host
);
582 port
= 22; /* default ssh port */
594 if ( (a
= inet_addr(host
)) == (unsigned long) INADDR_NONE
) {
595 if ( (h
= gethostbyname(host
)) == NULL
)
596 switch (WSAGetLastError()) {
597 case WSAENETDOWN
: return "Network is down";
598 case WSAHOST_NOT_FOUND
: case WSANO_DATA
:
599 return "Host does not exist";
600 case WSATRY_AGAIN
: return "Host not found";
601 default: return "gethostbyname: unknown error";
603 memcpy (&a
, h
->h_addr
, sizeof(a
));
604 *realhost
= h
->h_name
;
615 s
= socket(AF_INET
, SOCK_STREAM
, 0);
616 if (s
== INVALID_SOCKET
)
617 switch (WSAGetLastError()) {
618 case WSAENETDOWN
: return "Network is down";
619 case WSAEAFNOSUPPORT
: return "TCP/IP support not present";
620 default: return "socket(): unknown error";
624 * Bind to local address.
626 addr
.sin_family
= AF_INET
;
627 addr
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
628 addr
.sin_port
= htons(0);
629 if (bind (s
, (struct sockaddr
*)&addr
, sizeof(addr
)) == SOCKET_ERROR
)
630 switch (WSAGetLastError()) {
631 case WSAENETDOWN
: return "Network is down";
632 default: return "bind(): unknown error";
636 * Connect to remote address.
638 addr
.sin_addr
.s_addr
= htonl(a
);
639 addr
.sin_port
= htons((short)port
);
640 if (connect (s
, (struct sockaddr
*)&addr
, sizeof(addr
)) == SOCKET_ERROR
)
641 switch (WSAGetLastError()) {
642 case WSAENETDOWN
: return "Network is down";
643 case WSAECONNREFUSED
: return "Connection refused";
644 case WSAENETUNREACH
: return "Network is unreachable";
645 case WSAEHOSTUNREACH
: return "No route to host";
646 default: return "connect(): unknown error";
650 send(s
, "connect ", 8, 0);
651 send(s
, FWhost
, strlen(FWhost
), 0);
654 sprintf(buf
, " %d\n", FWport
);
655 send (s
, buf
, strlen(buf
), 0);
662 static int ssh_versioncmp(char *a
, char *b
) {
664 unsigned long av
, bv
;
666 av
= strtoul(a
, &ae
, 10);
667 bv
= strtoul(b
, &be
, 10);
668 if (av
!= bv
) return (av
< bv ?
-1 : +1);
669 if (*ae
== '.') ae
++;
670 if (*be
== '.') be
++;
671 av
= strtoul(ae
, &ae
, 10);
672 bv
= strtoul(be
, &be
, 10);
673 if (av
!= bv
) return (av
< bv ?
-1 : +1);
679 * Utility routine for putting an SSH-protocol `string' into a SHA
683 void sha_string(SHA_State
*s
, void *str
, int len
) {
684 unsigned char lenblk
[4];
686 PUT_32BIT(lenblk
, len
);
687 if (!fp
) fp
= fopen("h:\\statham\\windows\\putty\\data","wb");
688 fwrite(lenblk
, 4, 1, fp
);
689 SHA_Bytes(s
, lenblk
, 4);
690 fwrite(str
, len
, 1, fp
);
692 SHA_Bytes(s
, str
, len
);
695 static int do_ssh_init(void) {
699 char vlog
[sizeof(vstring
)+20];
704 while (s_read(&c
, 1) == 1) {
705 if (c
== 'S' && i
< 2) i
++;
706 else if (c
== 'S' && i
== 2) i
= 2;
707 else if (c
== 'H' && i
== 2) break;
711 if (s_read(&c
,1) != 1 || c
!= 'S') return 0;
712 if (s_read(&c
,1) != 1 || c
!= 'S') return 0;
713 if (s_read(&c
,1) != 1 || c
!= 'H') return 0;
715 strcpy(vstring
, "SSH-");
717 if (s_read(&c
,1) != 1 || c
!= '-') return 0;
720 if (s_read(&c
,1) != 1)
722 if (vsp
< vstring
+sizeof(vstring
)-1)
728 } else if (i
< sizeof(version
)-1)
736 sprintf(vlog
, "Server version: %s", vstring
);
737 vlog
[strcspn(vlog
, "\r\n")] = '\0';
740 if (ssh_versioncmp(version
, "1.99") >= 0) {
742 * This is a v2 server. Begin v2 protocol.
744 char *verstring
= "SSH-2.0-PuTTY";
747 * Hash our version string and their version string.
749 sha_string(&exhash
, verstring
, strlen(verstring
));
750 sha_string(&exhash
, vstring
, strcspn(vstring
, "\r\n"));
751 sprintf(vstring
, "%s\n", verstring
);
752 sprintf(vlog
, "We claim version: %s", verstring
);
754 logevent("Using SSH protocol version 2");
755 s_write(vstring
, strlen(vstring
));
756 ssh_protocol
= ssh2_protocol
;
757 s_rdpkt
= ssh2_rdpkt
;
760 * This is a v1 server. Begin v1 protocol.
762 sprintf(vstring
, "SSH-%s-PuTTY\n",
763 (ssh_versioncmp(version
, "1.5") <= 0 ? version
: "1.5"));
764 sprintf(vlog
, "We claim version: %s", vstring
);
765 vlog
[strcspn(vlog
, "\r\n")] = '\0';
767 logevent("Using SSH protocol version 1");
768 s_write(vstring
, strlen(vstring
));
769 ssh_protocol
= ssh1_protocol
;
770 s_rdpkt
= ssh1_rdpkt
;
776 * Handle the key exchange and user authentication phases.
778 static int do_ssh1_login(unsigned char *in
, int inlen
, int ispkt
)
781 unsigned char session_id
[16];
782 unsigned char *rsabuf
, *keystr1
, *keystr2
;
783 unsigned char cookie
[8];
784 struct RSAKey servkey
, hostkey
;
785 struct MD5Context md5c
;
786 static unsigned long supported_ciphers_mask
, supported_auths_mask
;
791 if (!ispkt
) crWaitUntil(ispkt
);
793 if (pktin
.type
!= SSH1_SMSG_PUBLIC_KEY
)
794 fatalbox("Public key packet not received");
796 logevent("Received public keys");
798 memcpy(cookie
, pktin
.body
, 8);
800 i
= makekey(pktin
.body
+8, &servkey
, &keystr1
);
801 j
= makekey(pktin
.body
+8+i
, &hostkey
, &keystr2
);
804 * Hash the host key and print the hash in the log box. Just as
805 * a last resort in case the registry's host key checking is
806 * compromised, we'll allow the user some ability to verify
810 MD5Update(&md5c
, keystr2
, hostkey
.bytes
);
811 MD5Final(session_id
, &md5c
);
815 logevent("Host key MD5 is:");
817 for (i
= 0; i
< 16; i
++)
818 sprintf(logmsg
+strlen(logmsg
), "%02x", session_id
[i
]);
822 supported_ciphers_mask
= GET_32BIT(pktin
.body
+12+i
+j
);
823 supported_auths_mask
= GET_32BIT(pktin
.body
+16+i
+j
);
826 MD5Update(&md5c
, keystr2
, hostkey
.bytes
);
827 MD5Update(&md5c
, keystr1
, servkey
.bytes
);
828 MD5Update(&md5c
, pktin
.body
, 8);
829 MD5Final(session_id
, &md5c
);
832 session_key
[i
] = random_byte();
834 len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
836 rsabuf
= malloc(len
);
838 fatalbox("Out of memory");
841 * Verify the host key.
845 * First format the key into a string.
847 int len
= rsastr_len(&hostkey
);
848 char *keystr
= malloc(len
);
850 fatalbox("Out of memory");
851 rsastr_fmt(keystr
, &hostkey
);
852 verify_ssh_host_key(savedhost
, keystr
);
856 for (i
=0; i
<32; i
++) {
857 rsabuf
[i
] = session_key
[i
];
859 rsabuf
[i
] ^= session_id
[i
];
862 if (hostkey
.bytes
> servkey
.bytes
) {
863 rsaencrypt(rsabuf
, 32, &servkey
);
864 rsaencrypt(rsabuf
, servkey
.bytes
, &hostkey
);
866 rsaencrypt(rsabuf
, 32, &hostkey
);
867 rsaencrypt(rsabuf
, hostkey
.bytes
, &servkey
);
870 logevent("Encrypted session key");
872 cipher_type
= cfg
.cipher
== CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH
:
873 cfg
.cipher
== CIPHER_DES ? SSH_CIPHER_DES
:
875 if ((supported_ciphers_mask
& (1 << cipher_type
)) == 0) {
876 c_write("Selected cipher not supported, falling back to 3DES\r\n", 53);
877 cipher_type
= SSH_CIPHER_3DES
;
879 switch (cipher_type
) {
880 case SSH_CIPHER_3DES
: logevent("Using 3DES encryption"); break;
881 case SSH_CIPHER_DES
: logevent("Using single-DES encryption"); break;
882 case SSH_CIPHER_BLOWFISH
: logevent("Using Blowfish encryption"); break;
885 send_packet(SSH1_CMSG_SESSION_KEY
,
886 PKT_CHAR
, cipher_type
,
888 PKT_CHAR
, (len
*8) >> 8, PKT_CHAR
, (len
*8) & 0xFF,
889 PKT_DATA
, rsabuf
, len
,
893 logevent("Trying to enable encryption...");
897 cipher
= cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish
:
898 cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
900 cipher
->sesskey(session_key
);
904 if (pktin
.type
!= SSH1_SMSG_SUCCESS
)
905 fatalbox("Encryption not successfully enabled");
907 logevent("Successfully started encryption");
911 static char username
[100];
914 if (!IS_SCP
&& !*cfg
.username
) {
915 c_write("login as: ", 10);
918 while (inlen
--) switch (c
= *in
++) {
940 if (((c
>= ' ' && c
<= '~') ||
941 ((unsigned char)c
>= 160)) && pos
< 40) {
949 username
[strcspn(username
, "\n\r")] = '\0';
952 strncpy(username
, cfg
.username
, 99);
955 sprintf(stuff
, "Sent username \"%s\".\r\n", username
);
956 c_write(stuff
, strlen(stuff
));
960 send_packet(SSH1_CMSG_USER
, PKT_STR
, username
, PKT_END
);
962 char userlog
[20+sizeof(username
)];
963 sprintf(userlog
, "Sent username \"%s\"", username
);
970 while (pktin
.type
== SSH1_SMSG_FAILURE
) {
971 static char password
[100];
974 static int pwpkt_type
;
977 * Show password prompt, having first obtained it via a TIS
978 * exchange if we're doing TIS authentication.
980 pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
984 sprintf(prompt
, "%s@%s's password: ", cfg
.username
, savedhost
);
985 if (!ssh_get_password(prompt
, password
, sizeof(password
))) {
987 * get_password failed to get a password (for
988 * example because one was supplied on the command
989 * line which has already failed to work).
992 logevent("No more passwords to try");
993 ssh_state
= SSH_STATE_CLOSED
;
998 if (pktin
.type
== SSH1_SMSG_FAILURE
&&
1000 (supported_auths_mask
& (1<<SSH1_AUTH_TIS
))) {
1001 pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
1002 logevent("Requested TIS authentication");
1003 send_packet(SSH1_CMSG_AUTH_TIS
, PKT_END
);
1005 if (pktin
.type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
1006 logevent("TIS authentication declined");
1007 c_write("TIS authentication refused.\r\n", 29);
1009 int challengelen
= ((pktin
.body
[0] << 24) |
1010 (pktin
.body
[1] << 16) |
1011 (pktin
.body
[2] << 8) |
1013 logevent("Received TIS challenge");
1014 c_write(pktin
.body
+4, challengelen
);
1017 if (pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
)
1018 c_write("password: ", 10);
1022 crWaitUntil(!ispkt
);
1023 while (inlen
--) switch (c
= *in
++) {
1040 if (((c
>= ' ' && c
<= '~') ||
1041 ((unsigned char)c
>= 160)) && pos
< 40)
1042 password
[pos
++] = c
;
1050 send_packet(pwpkt_type
, PKT_STR
, password
, PKT_END
);
1051 logevent("Sent password");
1052 memset(password
, 0, strlen(password
));
1054 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1055 c_write("Access denied\r\n", 15);
1056 logevent("Authentication refused");
1057 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1058 logevent("Received disconnect request");
1059 ssh_state
= SSH_STATE_CLOSED
;
1061 } else if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1062 fatalbox("Strange packet received, type %d", pktin
.type
);
1066 logevent("Authentication successful");
1071 static void ssh1_protocol(unsigned char *in
, int inlen
, int ispkt
) {
1076 while (!do_ssh1_login(in
, inlen
, ispkt
)) {
1079 if (ssh_state
== SSH_STATE_CLOSED
)
1083 send_packet(SSH1_CMSG_REQUEST_PTY
,
1084 PKT_STR
, cfg
.termtype
,
1085 PKT_INT
, rows
, PKT_INT
, cols
,
1086 PKT_INT
, 0, PKT_INT
, 0,
1089 ssh_state
= SSH_STATE_INTERMED
;
1090 do { crReturnV
; } while (!ispkt
);
1091 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1092 fatalbox("Protocol confusion");
1093 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1094 c_write("Server refused to allocate pty\r\n", 32);
1096 logevent("Allocated pty");
1099 send_packet(SSH1_CMSG_EXEC_SHELL
, PKT_END
);
1100 logevent("Started session");
1102 ssh_state
= SSH_STATE_SESSION
;
1109 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
1110 pktin
.type
== SSH1_SMSG_STDERR_DATA
) {
1111 long len
= GET_32BIT(pktin
.body
);
1112 c_write(pktin
.body
+4, len
);
1113 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1114 ssh_state
= SSH_STATE_CLOSED
;
1115 logevent("Received disconnect request");
1116 } else if (pktin
.type
== SSH1_SMSG_SUCCESS
) {
1117 /* may be from EXEC_SHELL on some servers */
1118 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1119 /* may be from EXEC_SHELL on some servers
1120 * if no pty is available or in other odd cases. Ignore */
1121 } else if (pktin
.type
== SSH1_SMSG_EXIT_STATUS
) {
1122 send_packet(SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
1124 fatalbox("Strange packet received: type %d", pktin
.type
);
1127 send_packet(SSH1_CMSG_STDIN_DATA
,
1128 PKT_INT
, inlen
, PKT_DATA
, in
, inlen
, PKT_END
);
1136 * SSH2 packet construction functions.
1138 void ssh2_pkt_adddata(void *data
, int len
) {
1139 pktout
.length
+= len
;
1140 if (pktout
.maxlen
< pktout
.length
) {
1141 pktout
.maxlen
= pktout
.length
+ 256;
1142 pktout
.data
= (pktout
.data
== NULL ?
malloc(pktout
.maxlen
+APIEXTRA
) :
1143 realloc(pktout
.data
, pktout
.maxlen
+APIEXTRA
));
1145 fatalbox("Out of memory");
1147 memcpy(pktout
.data
+pktout
.length
-len
, data
, len
);
1149 void ssh2_pkt_addbyte(unsigned char byte
) {
1150 ssh2_pkt_adddata(&byte
, 1);
1152 void ssh2_pkt_init(int pkt_type
) {
1154 ssh2_pkt_addbyte((unsigned char)pkt_type
);
1156 void ssh2_pkt_addbool(unsigned char value
) {
1157 ssh2_pkt_adddata(&value
, 1);
1159 void ssh2_pkt_adduint32(unsigned long value
) {
1161 PUT_32BIT(x
, value
);
1162 ssh2_pkt_adddata(x
, 4);
1164 void ssh2_pkt_addstring_start(void) {
1165 ssh2_pkt_adduint32(0);
1166 pktout
.savedpos
= pktout
.length
;
1168 void ssh2_pkt_addstring_str(char *data
) {
1169 ssh2_pkt_adddata(data
, strlen(data
));
1170 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
1171 pktout
.length
- pktout
.savedpos
);
1173 void ssh2_pkt_addstring_data(char *data
, int len
) {
1174 ssh2_pkt_adddata(data
, len
);
1175 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
1176 pktout
.length
- pktout
.savedpos
);
1178 void ssh2_pkt_addstring(char *data
) {
1179 ssh2_pkt_addstring_start();
1180 ssh2_pkt_addstring_str(data
);
1182 char *ssh2_mpint_fmt(Bignum b
, int *len
) {
1185 p
= malloc(n
* 2 + 1);
1187 fatalbox("out of memory");
1189 for (i
= 0; i
< n
; i
++) {
1190 p
[i
*2+1] = (b
[n
-i
] >> 8) & 0xFF;
1191 p
[i
*2+2] = (b
[n
-i
] ) & 0xFF;
1194 while (p
[i
] == 0 && (p
[i
+1] & 0x80) == 0)
1196 memmove(p
, p
+i
, n
*2+1-i
);
1200 void ssh2_pkt_addmp(Bignum b
) {
1203 p
= ssh2_mpint_fmt(b
, &len
);
1204 ssh2_pkt_addstring_start();
1205 ssh2_pkt_addstring_data(p
, len
);
1208 void ssh2_pkt_send(void) {
1209 int cipherblk
, maclen
, padding
, i
;
1210 unsigned long outgoing_sequence
= 0;
1213 * Add padding. At least four bytes, and must also bring total
1214 * length (minus MAC) up to a multiple of the block size.
1216 cipherblk
= cipher ? cipher
->blksize
: 8; /* block size */
1217 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
1219 padding
+= (cipherblk
- (pktout
.length
+ padding
) % cipherblk
) % cipherblk
;
1220 pktout
.data
[4] = padding
;
1221 for (i
= 0; i
< padding
; i
++)
1222 pktout
.data
[pktout
.length
+ i
] = random_byte();
1223 PUT_32BIT(pktout
.data
, pktout
.length
+ padding
- 4);
1225 csmac
->generate(pktout
.data
, outgoing_sequence
++,
1226 pktout
.length
+ padding
);
1228 cscipher
->encrypt(pktout
.data
, pktout
.length
+ padding
);
1229 maclen
= csmac ? csmac
->len
: 0;
1231 debug(("Sending packet len=%d\r\n", pktout
.length
+padding
+maclen
));
1232 for (i
= 0; i
< pktout
.length
+padding
+maclen
; i
++)
1233 debug((" %02x", (unsigned char)pktout
.data
[i
]));
1236 s_write(pktout
.data
, pktout
.length
+ padding
+ maclen
);
1239 void sha_mpint(SHA_State
*s
, Bignum b
) {
1242 p
= ssh2_mpint_fmt(b
, &len
);
1243 sha_string(s
, p
, len
);
1248 * SSH2 packet decode functions.
1250 void ssh2_pkt_getstring(char **p
, int *length
) {
1252 if (pktin
.length
- pktin
.savedpos
< 4)
1254 *length
= GET_32BIT(pktin
.data
+pktin
.savedpos
);
1255 pktin
.savedpos
+= 4;
1256 if (pktin
.length
- pktin
.savedpos
< *length
)
1258 *p
= pktin
.data
+pktin
.savedpos
;
1259 pktin
.savedpos
+= *length
;
1261 Bignum
ssh2_pkt_getmp(void) {
1266 ssh2_pkt_getstring(&p
, &length
);
1270 fatalbox("internal error: Can't handle negative mpints");
1271 b
= newbn((length
+1)/2);
1272 for (i
= 0; i
< length
; i
++) {
1275 b
[j
/2+1] |= ((unsigned char)p
[i
]) << 8;
1277 b
[j
/2+1] |= ((unsigned char)p
[i
]);
1282 void bndebug(char *string
, Bignum b
) {
1285 p
= ssh2_mpint_fmt(b
, &len
);
1286 debug(("%s", string
));
1287 for (i
= 0; i
< len
; i
++)
1288 debug((" %02x", p
[i
]));
1294 * Utility routine for decoding comma-separated strings in KEXINIT.
1296 int in_commasep_string(char *needle
, char *haystack
, int haylen
) {
1297 int needlen
= strlen(needle
);
1300 * Is it at the start of the string?
1302 if (haylen
>= needlen
&& /* haystack is long enough */
1303 !memcmp(needle
, haystack
, needlen
) && /* initial match */
1304 (haylen
== needlen
|| haystack
[needlen
] == ',')
1305 /* either , or EOS follows */
1309 * If not, search for the next comma and resume after that.
1310 * If no comma found, terminate.
1312 while (haylen
> 0 && *haystack
!= ',')
1313 haylen
--, haystack
++;
1316 haylen
--, haystack
++; /* skip over comma itself */
1321 * SSH2 key creation method.
1323 void ssh2_mkkey(Bignum K
, char *H
, char chr
, char *keyspace
) {
1325 /* First 20 bytes. */
1328 SHA_Bytes(&s
, H
, 20);
1329 SHA_Bytes(&s
, &chr
, 1);
1330 SHA_Bytes(&s
, H
, 20);
1331 SHA_Final(&s
, keyspace
);
1332 /* Next 20 bytes. */
1335 SHA_Bytes(&s
, H
, 20);
1336 SHA_Bytes(&s
, keyspace
, 20);
1337 SHA_Final(&s
, keyspace
+20);
1341 * Handle the SSH2 key exchange phase.
1343 static int do_ssh2_kex(unsigned char *in
, int inlen
, int ispkt
)
1347 static Bignum e
, f
, K
;
1348 static struct ssh_cipher
*cscipher_tobe
= NULL
;
1349 static struct ssh_cipher
*sccipher_tobe
= NULL
;
1350 static struct ssh_mac
*csmac_tobe
= NULL
;
1351 static struct ssh_mac
*scmac_tobe
= NULL
;
1352 static struct ssh_compress
*cscomp_tobe
= NULL
;
1353 static struct ssh_compress
*sccomp_tobe
= NULL
;
1354 static char *hostkeydata
, *sigdata
;
1355 static int hostkeylen
, siglen
;
1356 static unsigned char exchange_hash
[20];
1357 static unsigned char keyspace
[40];
1362 * Construct and send our key exchange packet.
1364 ssh2_pkt_init(SSH2_MSG_KEXINIT
);
1365 for (i
= 0; i
< 16; i
++)
1366 ssh2_pkt_addbyte((unsigned char)random_byte());
1367 /* List key exchange algorithms. */
1368 ssh2_pkt_addstring_start();
1369 for (i
= 0; i
< lenof(kex_algs
); i
++) {
1370 ssh2_pkt_addstring_str(kex_algs
[i
]->name
);
1371 if (i
< lenof(kex_algs
)-1)
1372 ssh2_pkt_addstring_str(",");
1374 /* List server host key algorithms. */
1375 ssh2_pkt_addstring_start();
1376 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
1377 ssh2_pkt_addstring_str(hostkey_algs
[i
]->name
);
1378 if (i
< lenof(hostkey_algs
)-1)
1379 ssh2_pkt_addstring_str(",");
1381 /* List client->server encryption algorithms. */
1382 ssh2_pkt_addstring_start();
1383 for (i
= 0; i
< lenof(ciphers
); i
++) {
1384 ssh2_pkt_addstring_str(ciphers
[i
]->name
);
1385 if (i
< lenof(ciphers
)-1)
1386 ssh2_pkt_addstring_str(",");
1388 /* List server->client encryption algorithms. */
1389 ssh2_pkt_addstring_start();
1390 for (i
= 0; i
< lenof(ciphers
); i
++) {
1391 ssh2_pkt_addstring_str(ciphers
[i
]->name
);
1392 if (i
< lenof(ciphers
)-1)
1393 ssh2_pkt_addstring_str(",");
1395 /* List client->server MAC algorithms. */
1396 ssh2_pkt_addstring_start();
1397 for (i
= 0; i
< lenof(macs
); i
++) {
1398 ssh2_pkt_addstring_str(macs
[i
]->name
);
1399 if (i
< lenof(macs
)-1)
1400 ssh2_pkt_addstring_str(",");
1402 /* List server->client MAC algorithms. */
1403 ssh2_pkt_addstring_start();
1404 for (i
= 0; i
< lenof(macs
); i
++) {
1405 ssh2_pkt_addstring_str(macs
[i
]->name
);
1406 if (i
< lenof(macs
)-1)
1407 ssh2_pkt_addstring_str(",");
1409 /* List client->server compression algorithms. */
1410 ssh2_pkt_addstring_start();
1411 for (i
= 0; i
< lenof(compressions
); i
++) {
1412 ssh2_pkt_addstring_str(compressions
[i
]->name
);
1413 if (i
< lenof(compressions
)-1)
1414 ssh2_pkt_addstring_str(",");
1416 /* List server->client compression algorithms. */
1417 ssh2_pkt_addstring_start();
1418 for (i
= 0; i
< lenof(compressions
); i
++) {
1419 ssh2_pkt_addstring_str(compressions
[i
]->name
);
1420 if (i
< lenof(compressions
)-1)
1421 ssh2_pkt_addstring_str(",");
1423 /* List client->server languages. Empty list. */
1424 ssh2_pkt_addstring_start();
1425 /* List server->client languages. Empty list. */
1426 ssh2_pkt_addstring_start();
1427 /* First KEX packet does _not_ follow, because we're not that brave. */
1428 ssh2_pkt_addbool(FALSE
);
1430 ssh2_pkt_adduint32(0);
1431 sha_string(&exhash
, pktout
.data
+5, pktout
.length
-5);
1434 if (!ispkt
) crWaitUntil(ispkt
);
1435 sha_string(&exhash
, pktin
.data
+5, pktin
.length
-5);
1438 * Now examine the other side's KEXINIT to see what we're up
1441 if (pktin
.type
!= SSH2_MSG_KEXINIT
)
1442 fatalbox("expected key exchange packet from server");
1443 kex
= NULL
; hostkey
= NULL
; cscipher_tobe
= NULL
; sccipher_tobe
= NULL
;
1444 csmac_tobe
= NULL
; scmac_tobe
= NULL
; cscomp_tobe
= NULL
; sccomp_tobe
= NULL
;
1445 pktin
.savedpos
+= 16; /* skip garbage cookie */
1446 ssh2_pkt_getstring(&str
, &len
); /* key exchange algorithms */
1447 for (i
= 0; i
< lenof(kex_algs
); i
++) {
1448 if (in_commasep_string(kex_algs
[i
]->name
, str
, len
)) {
1453 ssh2_pkt_getstring(&str
, &len
); /* host key algorithms */
1454 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
1455 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
1456 hostkey
= hostkey_algs
[i
];
1460 ssh2_pkt_getstring(&str
, &len
); /* client->server cipher */
1461 for (i
= 0; i
< lenof(ciphers
); i
++) {
1462 if (in_commasep_string(ciphers
[i
]->name
, str
, len
)) {
1463 cscipher_tobe
= ciphers
[i
];
1467 ssh2_pkt_getstring(&str
, &len
); /* server->client cipher */
1468 for (i
= 0; i
< lenof(ciphers
); i
++) {
1469 if (in_commasep_string(ciphers
[i
]->name
, str
, len
)) {
1470 sccipher_tobe
= ciphers
[i
];
1474 ssh2_pkt_getstring(&str
, &len
); /* client->server mac */
1475 for (i
= 0; i
< lenof(macs
); i
++) {
1476 if (in_commasep_string(macs
[i
]->name
, str
, len
)) {
1477 csmac_tobe
= macs
[i
];
1481 ssh2_pkt_getstring(&str
, &len
); /* server->client mac */
1482 for (i
= 0; i
< lenof(macs
); i
++) {
1483 if (in_commasep_string(macs
[i
]->name
, str
, len
)) {
1484 scmac_tobe
= macs
[i
];
1488 ssh2_pkt_getstring(&str
, &len
); /* client->server compression */
1489 for (i
= 0; i
< lenof(compressions
); i
++) {
1490 if (in_commasep_string(compressions
[i
]->name
, str
, len
)) {
1491 cscomp_tobe
= compressions
[i
];
1495 ssh2_pkt_getstring(&str
, &len
); /* server->client compression */
1496 for (i
= 0; i
< lenof(compressions
); i
++) {
1497 if (in_commasep_string(compressions
[i
]->name
, str
, len
)) {
1498 sccomp_tobe
= compressions
[i
];
1502 debug(("key exchange is %s\r\n", kex ? kex
->name
: NULL
));
1503 debug(("host key alg is %s\r\n", hostkey ? hostkey
->name
: NULL
));
1504 debug(("cscipher alg is %s\r\n", cscipher_tobe ? cscipher_tobe
->name
: NULL
));
1505 debug(("sccipher alg is %s\r\n", sccipher_tobe ? sccipher_tobe
->name
: NULL
));
1506 debug(("csmac alg is %s\r\n", csmac_tobe ? csmac_tobe
->name
: NULL
));
1507 debug(("scmac alg is %s\r\n", scmac_tobe ? scmac_tobe
->name
: NULL
));
1508 debug(("cscomp alg is %s\r\n", cscomp_tobe ? cscomp_tobe
->name
: NULL
));
1509 debug(("sccomp alg is %s\r\n", sccomp_tobe ? sccomp_tobe
->name
: NULL
));
1512 * Currently we only support Diffie-Hellman and DSS, so let's
1513 * bomb out if those aren't selected.
1515 if (kex
!= &ssh_diffiehellman
|| hostkey
!= &ssh_dss
)
1516 fatalbox("internal fault: chaos in SSH 2 transport layer");
1519 * Now we begin the fun. Generate and send e for Diffie-Hellman.
1523 ssh2_pkt_init(SSH2_MSG_KEXDH_INIT
);
1528 if (pktin
.type
!= SSH2_MSG_KEXDH_REPLY
)
1529 fatalbox("expected key exchange packet from server");
1530 ssh2_pkt_getstring(&hostkeydata
, &hostkeylen
);
1531 f
= ssh2_pkt_getmp();
1533 ssh2_pkt_getstring(&sigdata
, &siglen
);
1538 sha_string(&exhash
, hostkeydata
, hostkeylen
);
1539 sha_mpint(&exhash
, e
);
1540 sha_mpint(&exhash
, f
);
1541 sha_mpint(&exhash
, K
);
1542 SHA_Final(&exhash
, exchange_hash
);
1544 debug(("Exchange hash is:\r\n"));
1545 for (i
= 0; i
< 20; i
++)
1546 debug((" %02x", exchange_hash
[i
]));
1550 * FIXME: verify host key. This bit will be moderately
1551 * unpleasant, because of having to rewrite it to work
1552 * alongside the old scheme.
1556 * FIXME: verify signature of exchange hash.
1560 * Send SSH2_MSG_NEWKEYS. Expect it from server.
1562 ssh2_pkt_init(SSH2_MSG_NEWKEYS
);
1565 if (pktin
.type
!= SSH2_MSG_NEWKEYS
)
1566 fatalbox("expected new-keys packet from server");
1569 * Create and initialise session keys.
1571 cscipher
= cscipher_tobe
;
1572 sccipher
= sccipher_tobe
;
1575 cscomp
= cscomp_tobe
;
1576 sccomp
= sccomp_tobe
;
1578 * Set IVs after keys.
1580 ssh2_mkkey(K
, exchange_hash
, 'C', keyspace
); cscipher
->setcskey(keyspace
);
1581 ssh2_mkkey(K
, exchange_hash
, 'D', keyspace
); cscipher
->setsckey(keyspace
);
1582 ssh2_mkkey(K
, exchange_hash
, 'A', keyspace
); cscipher
->setcsiv(keyspace
);
1583 ssh2_mkkey(K
, exchange_hash
, 'B', keyspace
); sccipher
->setsciv(keyspace
);
1584 ssh2_mkkey(K
, exchange_hash
, 'E', keyspace
); csmac
->setcskey(keyspace
);
1585 ssh2_mkkey(K
, exchange_hash
, 'F', keyspace
); scmac
->setsckey(keyspace
);
1592 static void ssh2_protocol(unsigned char *in
, int inlen
, int ispkt
) {
1597 while (!do_ssh2_kex(in
, inlen
, ispkt
)) {
1605 * Called to set up the connection. Will arrange for WM_NETEVENT
1606 * messages to be passed to the specified window, whose window
1607 * procedure should then call telnet_msg().
1609 * Returns an error message, or NULL on success.
1611 static char *ssh_init (HWND hwnd
, char *host
, int port
, char **realhost
) {
1615 if(crypto_startup() == 0)
1616 return "Microsoft high encryption pack not installed!";
1619 p
= connect_to_host(host
, port
, realhost
);
1624 return "Protocol initialisation error";
1626 if (WSAAsyncSelect (s
, hwnd
, WM_NETEVENT
, FD_READ
| FD_CLOSE
) == SOCKET_ERROR
)
1627 switch (WSAGetLastError()) {
1628 case WSAENETDOWN
: return "Network is down";
1629 default: return "WSAAsyncSelect(): unknown error";
1636 * Process a WM_NETEVENT message. Will return 0 if the connection
1637 * has closed, or <0 for a socket error.
1639 static int ssh_msg (WPARAM wParam
, LPARAM lParam
) {
1644 * Because reading less than the whole of the available pending
1645 * data can generate an FD_READ event, we need to allow for the
1646 * possibility that FD_READ may arrive with FD_CLOSE already in
1647 * the queue; so it's possible that we can get here even with s
1648 * invalid. If so, we return 1 and don't worry about it.
1650 if (s
== INVALID_SOCKET
)
1653 if (WSAGETSELECTERROR(lParam
) != 0)
1654 return -WSAGETSELECTERROR(lParam
);
1656 switch (WSAGETSELECTEVENT(lParam
)) {
1659 ret
= recv(s
, buf
, sizeof(buf
), 0);
1660 if (ret
< 0 && WSAGetLastError() == WSAEWOULDBLOCK
)
1662 if (ret
< 0) /* any _other_ error */
1663 return -10000-WSAGetLastError();
1668 ssh_gotdata (buf
, ret
);
1669 if (ssh_state
== SSH_STATE_CLOSED
) {
1676 return 1; /* shouldn't happen, but WTF */
1680 * Called to send data down the Telnet connection.
1682 static void ssh_send (char *buf
, int len
) {
1683 if (s
== INVALID_SOCKET
)
1686 ssh_protocol(buf
, len
, 0);
1690 * Called to set the size of the window from Telnet's POV.
1692 static void ssh_size(void) {
1693 switch (ssh_state
) {
1694 case SSH_STATE_BEFORE_SIZE
:
1695 case SSH_STATE_CLOSED
:
1696 break; /* do nothing */
1697 case SSH_STATE_INTERMED
:
1698 size_needed
= TRUE
; /* buffer for later */
1700 case SSH_STATE_SESSION
:
1702 send_packet(SSH1_CMSG_WINDOW_SIZE
,
1703 PKT_INT
, rows
, PKT_INT
, cols
,
1704 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
1710 * (Send Telnet special codes)
1712 static void ssh_special (Telnet_Special code
) {
1718 * Read and decrypt one incoming SSH packet.
1719 * (only used by pSCP)
1721 static void get_packet(void)
1723 unsigned char buf
[4096], *p
;
1732 while ((to_read
= s_rdpkt(&p
, &len
)) > 0) {
1733 if (to_read
> sizeof(buf
)) to_read
= sizeof(buf
);
1734 len
= s_read(buf
, to_read
);
1735 if (len
!= to_read
) {
1747 * Receive a block of data over the SSH link. Block until
1748 * all data is available. Return nr of bytes read (0 if lost connection).
1749 * (only used by pSCP)
1751 int ssh_scp_recv(unsigned char *buf
, int len
)
1753 static int pending_input_len
= 0;
1754 static unsigned char *pending_input_ptr
;
1759 if (pending_input_len
>= to_read
) {
1760 memcpy(buf
, pending_input_ptr
, to_read
);
1761 pending_input_ptr
+= to_read
;
1762 pending_input_len
-= to_read
;
1766 if (pending_input_len
> 0) {
1767 memcpy(buf
, pending_input_ptr
, pending_input_len
);
1768 buf
+= pending_input_len
;
1769 to_read
-= pending_input_len
;
1770 pending_input_len
= 0;
1773 if (s
== INVALID_SOCKET
)
1775 while (to_read
> 0) {
1777 if (s
== INVALID_SOCKET
)
1779 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
) {
1780 int plen
= GET_32BIT(pktin
.body
);
1781 if (plen
<= to_read
) {
1782 memcpy(buf
, pktin
.body
+ 4, plen
);
1786 memcpy(buf
, pktin
.body
+ 4, to_read
);
1787 pending_input_len
= plen
- to_read
;
1788 pending_input_ptr
= pktin
.body
+ 4 + to_read
;
1791 } else if (pktin
.type
== SSH1_SMSG_STDERR_DATA
) {
1792 int plen
= GET_32BIT(pktin
.body
);
1793 fwrite(pktin
.body
+ 4, plen
, 1, stderr
);
1794 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1795 logevent("Received disconnect request");
1796 } else if (pktin
.type
== SSH1_SMSG_SUCCESS
||
1797 pktin
.type
== SSH1_SMSG_FAILURE
) {
1799 } else if (pktin
.type
== SSH1_SMSG_EXIT_STATUS
) {
1801 sprintf(logbuf
, "Remote exit status: %d", GET_32BIT(pktin
.body
));
1803 send_packet(SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
1804 logevent("Closing connection");
1808 fatalbox("Strange packet received: type %d", pktin
.type
);
1816 * Send a block of data over the SSH link.
1817 * Block until all data is sent.
1818 * (only used by pSCP)
1820 void ssh_scp_send(unsigned char *buf
, int len
)
1823 if (s
== INVALID_SOCKET
)
1825 send_packet(SSH1_CMSG_STDIN_DATA
,
1826 PKT_INT
, len
, PKT_DATA
, buf
, len
, PKT_END
);
1830 * Send an EOF notification to the server.
1831 * (only used by pSCP)
1833 void ssh_scp_send_eof(void)
1836 if (s
== INVALID_SOCKET
)
1838 send_packet(SSH1_CMSG_EOF
, PKT_END
);
1842 * Set up the connection, login on the remote host and
1843 * start execution of a command.
1844 * Returns an error message, or NULL on success.
1845 * (only used by pSCP)
1847 char *ssh_scp_init(char *host
, int port
, char *cmd
, char **realhost
)
1854 if (crypto_startup() == 0)
1855 return "Microsoft high encryption pack not installed!";
1858 p
= connect_to_host(host
, port
, realhost
);
1865 return "Protocol initialisation error";
1867 /* Exchange keys and login */
1870 if (s
== INVALID_SOCKET
)
1871 return "Connection closed by remote host";
1872 } while (!do_ssh1_login(NULL
, 0, 1));
1874 if (ssh_state
== SSH_STATE_CLOSED
) {
1877 return "Session initialisation error";
1880 /* Execute command */
1881 sprintf(buf
, "Sending command: %.100s", cmd
);
1883 send_packet(SSH1_CMSG_EXEC_CMD
, PKT_STR
, cmd
, PKT_END
);
1889 Backend ssh_backend
= {