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_3des_ssh2
;
92 extern struct ssh_cipher ssh_des
;
93 extern struct ssh_cipher ssh_blowfish
;
95 /* for ssh 2; we miss out single-DES because it isn't supported */
96 struct ssh_cipher
*ciphers
[] = { &ssh_3des_ssh2
, &ssh_blowfish
};
98 extern struct ssh_kex ssh_diffiehellman
;
99 struct ssh_kex
*kex_algs
[] = { &ssh_diffiehellman
};
101 extern struct ssh_hostkey ssh_dss
;
102 struct ssh_hostkey
*hostkey_algs
[] = { &ssh_dss
};
104 extern struct ssh_mac ssh_sha1
;
108 static void nullmac_key(unsigned char *key
) { }
109 static void nullmac_generate(unsigned char *blk
, int len
, unsigned long seq
) { }
110 static int nullmac_verify(unsigned char *blk
, int len
, unsigned long seq
) { return 1; }
111 struct ssh_mac ssh_mac_none
= {
112 nullmac_key
, nullmac_key
, nullmac_generate
, nullmac_verify
, "none", 0
114 struct ssh_mac
*macs
[] = { &ssh_sha1
, &ssh_mac_none
};
116 struct ssh_compress ssh_comp_none
= {
119 struct ssh_compress
*compressions
[] = { &ssh_comp_none
};
121 static SOCKET s
= INVALID_SOCKET
;
123 static unsigned char session_key
[32];
124 static struct ssh_cipher
*cipher
= NULL
;
125 static struct ssh_cipher
*cscipher
= NULL
;
126 static struct ssh_cipher
*sccipher
= NULL
;
127 static struct ssh_mac
*csmac
= NULL
;
128 static struct ssh_mac
*scmac
= NULL
;
129 static struct ssh_compress
*cscomp
= NULL
;
130 static struct ssh_compress
*sccomp
= NULL
;
131 static struct ssh_kex
*kex
= NULL
;
132 static struct ssh_hostkey
*hostkey
= NULL
;
134 int (*ssh_get_password
)(const char *prompt
, char *str
, int maxlen
) = NULL
;
136 static char *savedhost
;
139 SSH_STATE_BEFORE_SIZE
,
143 } ssh_state
= SSH_STATE_BEFORE_SIZE
;
145 static int size_needed
= FALSE
;
147 static void s_write (char *buf
, int len
) {
149 int i
= send (s
, buf
, len
, 0);
153 fatalbox("Lost connection while sending");
160 static int s_read (char *buf
, int len
) {
163 int i
= recv (s
, buf
, len
, 0);
167 len
-= i
, buf
+= i
, ret
+= i
;
174 static void c_write (char *buf
, int len
) {
176 if (len
> 0 && buf
[len
-1] == '\n') len
--;
177 if (len
> 0 && buf
[len
-1] == '\r') len
--;
178 if (len
> 0) { fwrite(buf
, len
, 1, stderr
); fputc('\n', stderr
); }
194 static struct Packet pktin
= { 0, 0, NULL
, NULL
, 0 };
195 static struct Packet pktout
= { 0, 0, NULL
, NULL
, 0 };
197 static void (*ssh_protocol
)(unsigned char *in
, int inlen
, int ispkt
);
198 static void ssh1_protocol(unsigned char *in
, int inlen
, int ispkt
);
199 static void ssh2_protocol(unsigned char *in
, int inlen
, int ispkt
);
200 static void ssh_size(void);
202 static int (*s_rdpkt
)(unsigned char **data
, int *datalen
);
205 * Collect incoming data in the incoming packet buffer.
206 * Decipher and verify the packet when it is completely read.
207 * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets.
208 * Update the *data and *datalen variables.
209 * Return the additional nr of bytes needed, or 0 when
210 * a complete packet is available.
212 static int ssh1_rdpkt(unsigned char **data
, int *datalen
)
214 static long len
, pad
, biglen
, to_read
;
215 static unsigned long realcrc
, gotcrc
;
216 static unsigned char *p
;
226 for (i
= len
= 0; i
< 4; i
++) {
227 while ((*datalen
) == 0)
229 len
= (len
<< 8) + **data
;
230 (*data
)++, (*datalen
)--;
234 if (len
== 0x52656d6f) { /* "Remo"te server has closed ... */
235 len
= 0x300; /* big enough to carry to end */
241 pktin
.length
= len
- 5;
243 if (pktin
.maxlen
< biglen
) {
244 pktin
.maxlen
= biglen
;
245 pktin
.data
= (pktin
.data
== NULL ?
malloc(biglen
+APIEXTRA
) :
246 realloc(pktin
.data
, biglen
+APIEXTRA
));
248 fatalbox("Out of memory");
253 while (to_read
> 0) {
256 while ((*datalen
) == 0)
258 if (chunk
> (*datalen
))
260 memcpy(p
, *data
, chunk
);
268 cipher
->decrypt(pktin
.data
, biglen
);
270 pktin
.type
= pktin
.data
[pad
];
271 pktin
.body
= pktin
.data
+ pad
+ 1;
273 realcrc
= crc32(pktin
.data
, biglen
-4);
274 gotcrc
= GET_32BIT(pktin
.data
+biglen
-4);
275 if (gotcrc
!= realcrc
) {
276 fatalbox("Incorrect CRC received on packet");
279 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
280 pktin
.type
== SSH1_SMSG_STDERR_DATA
||
281 pktin
.type
== SSH1_MSG_DEBUG
||
282 pktin
.type
== SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
283 long strlen
= GET_32BIT(pktin
.body
);
284 if (strlen
+ 4 != pktin
.length
)
285 fatalbox("Received data packet with bogus string length");
288 if (pktin
.type
== SSH1_MSG_DEBUG
) {
289 /* log debug message */
291 int strlen
= GET_32BIT(pktin
.body
);
292 strcpy(buf
, "Remote: ");
293 if (strlen
> 70) strlen
= 70;
294 memcpy(buf
+8, pktin
.body
+4, strlen
);
295 buf
[8+strlen
] = '\0';
298 } else if (pktin
.type
== SSH1_MSG_IGNORE
) {
306 static int ssh2_rdpkt(unsigned char **data
, int *datalen
)
308 static long len
, pad
, payload
, packetlen
, maclen
;
310 static int cipherblk
;
311 static unsigned long incoming_sequence
= 0;
321 cipherblk
= cipher
->blksize
;
327 if (pktin
.maxlen
< cipherblk
) {
328 pktin
.maxlen
= cipherblk
;
329 pktin
.data
= (pktin
.data
== NULL ?
malloc(cipherblk
+APIEXTRA
) :
330 realloc(pktin
.data
, cipherblk
+APIEXTRA
));
332 fatalbox("Out of memory");
336 * Acquire and decrypt the first block of the packet. This will
337 * contain the length and padding details.
339 for (i
= len
= 0; i
< cipherblk
; i
++) {
340 while ((*datalen
) == 0)
341 crReturn(cipherblk
-i
);
342 pktin
.data
[i
] = *(*data
)++;
346 if (!memcmp(pktin
.data
, "Remo", 4)) {/* "Remo"te server has closed ... */
350 debug(("Got initblk:"));
351 for (i
= 0; i
< cipherblk
; i
++)
352 debug((" %02x", (unsigned char)pktin
.data
[i
]));
355 sccipher
->decrypt(pktin
.data
, cipherblk
);
356 debug(("Decrypted initblk:"));
357 for (i
= 0; i
< cipherblk
; i
++)
358 debug((" %02x", (unsigned char)pktin
.data
[i
]));
362 * Now get the length and padding figures.
364 len
= GET_32BIT(pktin
.data
);
368 * This enables us to deduce the payload length.
370 payload
= len
- pad
- 1;
372 pktin
.length
= payload
+ 5;
375 * So now we can work out the total packet length.
378 maclen
= scmac ? scmac
->len
: 0;
381 * Adjust memory allocation if packet is too big.
383 if (pktin
.maxlen
< packetlen
) {
384 pktin
.maxlen
= packetlen
;
385 pktin
.data
= (pktin
.data
== NULL ?
malloc(packetlen
+APIEXTRA
) :
386 realloc(pktin
.data
, packetlen
+APIEXTRA
));
388 fatalbox("Out of memory");
392 * Read and decrypt the remainder of the packet.
394 for (i
= cipherblk
; i
< packetlen
+ maclen
; i
++) {
395 while ((*datalen
) == 0)
396 crReturn(packetlen
+ maclen
- i
);
397 pktin
.data
[i
] = *(*data
)++;
400 /* Decrypt everything _except_ the MAC. */
402 sccipher
->decrypt(pktin
.data
+ cipherblk
, packetlen
- cipherblk
);
404 debug(("Got packet len=%d pad=%d\r\n", len
, pad
));
405 for (i
= 0; i
< packetlen
; i
++)
406 debug((" %02x", (unsigned char)pktin
.data
[i
]));
412 if (scmac
&& !scmac
->verify(pktin
.data
, len
+4, incoming_sequence
))
413 fatalbox("Incorrect MAC received on packet");
414 incoming_sequence
++; /* whether or not we MACed */
417 pktin
.type
= pktin
.data
[5];
420 * FIXME: handle IGNORE and DEBUG messages.
426 static void ssh_gotdata(unsigned char *data
, int datalen
)
428 while (datalen
> 0) {
429 if ( s_rdpkt(&data
, &datalen
) == 0 ) {
430 ssh_protocol(NULL
, 0, 1);
431 if (ssh_state
== SSH_STATE_CLOSED
) {
439 static void s_wrpkt_start(int type
, int len
) {
442 len
+= 5; /* type and CRC */
446 pktout
.length
= len
-5;
447 if (pktout
.maxlen
< biglen
) {
448 pktout
.maxlen
= biglen
;
450 /* Allocate enough buffer space for extra block
451 * for MS CryptEncrypt() */
452 pktout
.data
= (pktout
.data
== NULL ?
malloc(biglen
+12) :
453 realloc(pktout
.data
, biglen
+12));
455 pktout
.data
= (pktout
.data
== NULL ?
malloc(biglen
+4) :
456 realloc(pktout
.data
, biglen
+4));
459 fatalbox("Out of memory");
463 pktout
.body
= pktout
.data
+4+pad
+1;
466 static void s_wrpkt(void) {
467 int pad
, len
, biglen
, i
;
470 len
= pktout
.length
+ 5; /* type and CRC */
474 pktout
.body
[-1] = pktout
.type
;
475 for (i
=0; i
<pad
; i
++)
476 pktout
.data
[i
+4] = random_byte();
477 crc
= crc32(pktout
.data
+4, biglen
-4);
478 PUT_32BIT(pktout
.data
+biglen
, crc
);
479 PUT_32BIT(pktout
.data
, len
);
482 cipher
->encrypt(pktout
.data
+4, biglen
);
484 s_write(pktout
.data
, biglen
+4);
488 * Construct a packet with the specified contents and
489 * send it to the server.
491 static void send_packet(int pkttype
, ...)
494 unsigned char *p
, *argp
, argchar
;
495 unsigned long argint
;
496 int pktlen
, argtype
, arglen
;
499 va_start(args
, pkttype
);
500 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
503 (void) va_arg(args
, int);
507 (void) va_arg(args
, char);
511 (void) va_arg(args
, unsigned char *);
512 arglen
= va_arg(args
, int);
516 argp
= va_arg(args
, unsigned char *);
517 arglen
= strlen(argp
);
518 pktlen
+= 4 + arglen
;
526 s_wrpkt_start(pkttype
, pktlen
);
529 va_start(args
, pkttype
);
530 while ((argtype
= va_arg(args
, int)) != PKT_END
) {
533 argint
= va_arg(args
, int);
534 PUT_32BIT(p
, argint
);
538 argchar
= va_arg(args
, unsigned char);
543 argp
= va_arg(args
, unsigned char *);
544 arglen
= va_arg(args
, int);
545 memcpy(p
, argp
, arglen
);
549 argp
= va_arg(args
, unsigned char *);
550 arglen
= strlen(argp
);
551 PUT_32BIT(p
, arglen
);
552 memcpy(p
+ 4, argp
, arglen
);
564 * Connect to specified host and port.
565 * Returns an error message, or NULL on success.
566 * Also places the canonical host name into `realhost'.
568 static char *connect_to_host(char *host
, int port
, char **realhost
)
578 savedhost
= malloc(1+strlen(host
));
580 fatalbox("Out of memory");
581 strcpy(savedhost
, host
);
584 port
= 22; /* default ssh port */
596 if ( (a
= inet_addr(host
)) == (unsigned long) INADDR_NONE
) {
597 if ( (h
= gethostbyname(host
)) == NULL
)
598 switch (WSAGetLastError()) {
599 case WSAENETDOWN
: return "Network is down";
600 case WSAHOST_NOT_FOUND
: case WSANO_DATA
:
601 return "Host does not exist";
602 case WSATRY_AGAIN
: return "Host not found";
603 default: return "gethostbyname: unknown error";
605 memcpy (&a
, h
->h_addr
, sizeof(a
));
606 *realhost
= h
->h_name
;
617 s
= socket(AF_INET
, SOCK_STREAM
, 0);
618 if (s
== INVALID_SOCKET
)
619 switch (WSAGetLastError()) {
620 case WSAENETDOWN
: return "Network is down";
621 case WSAEAFNOSUPPORT
: return "TCP/IP support not present";
622 default: return "socket(): unknown error";
626 * Bind to local address.
628 addr
.sin_family
= AF_INET
;
629 addr
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
630 addr
.sin_port
= htons(0);
631 if (bind (s
, (struct sockaddr
*)&addr
, sizeof(addr
)) == SOCKET_ERROR
)
632 switch (WSAGetLastError()) {
633 case WSAENETDOWN
: return "Network is down";
634 default: return "bind(): unknown error";
638 * Connect to remote address.
640 addr
.sin_addr
.s_addr
= htonl(a
);
641 addr
.sin_port
= htons((short)port
);
642 if (connect (s
, (struct sockaddr
*)&addr
, sizeof(addr
)) == SOCKET_ERROR
)
643 switch (WSAGetLastError()) {
644 case WSAENETDOWN
: return "Network is down";
645 case WSAECONNREFUSED
: return "Connection refused";
646 case WSAENETUNREACH
: return "Network is unreachable";
647 case WSAEHOSTUNREACH
: return "No route to host";
648 default: return "connect(): unknown error";
652 send(s
, "connect ", 8, 0);
653 send(s
, FWhost
, strlen(FWhost
), 0);
656 sprintf(buf
, " %d\n", FWport
);
657 send (s
, buf
, strlen(buf
), 0);
664 static int ssh_versioncmp(char *a
, char *b
) {
666 unsigned long av
, bv
;
668 av
= strtoul(a
, &ae
, 10);
669 bv
= strtoul(b
, &be
, 10);
670 if (av
!= bv
) return (av
< bv ?
-1 : +1);
671 if (*ae
== '.') ae
++;
672 if (*be
== '.') be
++;
673 av
= strtoul(ae
, &ae
, 10);
674 bv
= strtoul(be
, &be
, 10);
675 if (av
!= bv
) return (av
< bv ?
-1 : +1);
681 * Utility routine for putting an SSH-protocol `string' into a SHA
685 void sha_string(SHA_State
*s
, void *str
, int len
) {
686 unsigned char lenblk
[4];
688 PUT_32BIT(lenblk
, len
);
689 if (!fp
) fp
= fopen("h:\\statham\\windows\\putty\\data","wb");
690 fwrite(lenblk
, 4, 1, fp
);
691 SHA_Bytes(s
, lenblk
, 4);
692 fwrite(str
, len
, 1, fp
);
694 SHA_Bytes(s
, str
, len
);
697 static int do_ssh_init(void) {
701 char vlog
[sizeof(vstring
)+20];
706 while (s_read(&c
, 1) == 1) {
707 if (c
== 'S' && i
< 2) i
++;
708 else if (c
== 'S' && i
== 2) i
= 2;
709 else if (c
== 'H' && i
== 2) break;
713 if (s_read(&c
,1) != 1 || c
!= 'S') return 0;
714 if (s_read(&c
,1) != 1 || c
!= 'S') return 0;
715 if (s_read(&c
,1) != 1 || c
!= 'H') return 0;
717 strcpy(vstring
, "SSH-");
719 if (s_read(&c
,1) != 1 || c
!= '-') return 0;
722 if (s_read(&c
,1) != 1)
724 if (vsp
< vstring
+sizeof(vstring
)-1)
730 } else if (i
< sizeof(version
)-1)
738 sprintf(vlog
, "Server version: %s", vstring
);
739 vlog
[strcspn(vlog
, "\r\n")] = '\0';
742 if (ssh_versioncmp(version
, "1.99") >= 0) {
744 * This is a v2 server. Begin v2 protocol.
746 char *verstring
= "SSH-2.0-PuTTY";
749 * Hash our version string and their version string.
751 sha_string(&exhash
, verstring
, strlen(verstring
));
752 sha_string(&exhash
, vstring
, strcspn(vstring
, "\r\n"));
753 sprintf(vstring
, "%s\n", verstring
);
754 sprintf(vlog
, "We claim version: %s", verstring
);
756 logevent("Using SSH protocol version 2");
757 s_write(vstring
, strlen(vstring
));
758 ssh_protocol
= ssh2_protocol
;
759 s_rdpkt
= ssh2_rdpkt
;
762 * This is a v1 server. Begin v1 protocol.
764 sprintf(vstring
, "SSH-%s-PuTTY\n",
765 (ssh_versioncmp(version
, "1.5") <= 0 ? version
: "1.5"));
766 sprintf(vlog
, "We claim version: %s", vstring
);
767 vlog
[strcspn(vlog
, "\r\n")] = '\0';
769 logevent("Using SSH protocol version 1");
770 s_write(vstring
, strlen(vstring
));
771 ssh_protocol
= ssh1_protocol
;
772 s_rdpkt
= ssh1_rdpkt
;
778 * Handle the key exchange and user authentication phases.
780 static int do_ssh1_login(unsigned char *in
, int inlen
, int ispkt
)
783 unsigned char session_id
[16];
784 unsigned char *rsabuf
, *keystr1
, *keystr2
;
785 unsigned char cookie
[8];
786 struct RSAKey servkey
, hostkey
;
787 struct MD5Context md5c
;
788 static unsigned long supported_ciphers_mask
, supported_auths_mask
;
793 if (!ispkt
) crWaitUntil(ispkt
);
795 if (pktin
.type
!= SSH1_SMSG_PUBLIC_KEY
)
796 fatalbox("Public key packet not received");
798 logevent("Received public keys");
800 memcpy(cookie
, pktin
.body
, 8);
802 i
= makekey(pktin
.body
+8, &servkey
, &keystr1
);
803 j
= makekey(pktin
.body
+8+i
, &hostkey
, &keystr2
);
806 * Hash the host key and print the hash in the log box. Just as
807 * a last resort in case the registry's host key checking is
808 * compromised, we'll allow the user some ability to verify
812 MD5Update(&md5c
, keystr2
, hostkey
.bytes
);
813 MD5Final(session_id
, &md5c
);
817 logevent("Host key MD5 is:");
819 for (i
= 0; i
< 16; i
++)
820 sprintf(logmsg
+strlen(logmsg
), "%02x", session_id
[i
]);
824 supported_ciphers_mask
= GET_32BIT(pktin
.body
+12+i
+j
);
825 supported_auths_mask
= GET_32BIT(pktin
.body
+16+i
+j
);
828 MD5Update(&md5c
, keystr2
, hostkey
.bytes
);
829 MD5Update(&md5c
, keystr1
, servkey
.bytes
);
830 MD5Update(&md5c
, pktin
.body
, 8);
831 MD5Final(session_id
, &md5c
);
834 session_key
[i
] = random_byte();
836 len
= (hostkey
.bytes
> servkey
.bytes ? hostkey
.bytes
: servkey
.bytes
);
838 rsabuf
= malloc(len
);
840 fatalbox("Out of memory");
843 * Verify the host key.
847 * First format the key into a string.
849 int len
= rsastr_len(&hostkey
);
850 char *keystr
= malloc(len
);
852 fatalbox("Out of memory");
853 rsastr_fmt(keystr
, &hostkey
);
854 verify_ssh_host_key(savedhost
, keystr
);
858 for (i
=0; i
<32; i
++) {
859 rsabuf
[i
] = session_key
[i
];
861 rsabuf
[i
] ^= session_id
[i
];
864 if (hostkey
.bytes
> servkey
.bytes
) {
865 rsaencrypt(rsabuf
, 32, &servkey
);
866 rsaencrypt(rsabuf
, servkey
.bytes
, &hostkey
);
868 rsaencrypt(rsabuf
, 32, &hostkey
);
869 rsaencrypt(rsabuf
, hostkey
.bytes
, &servkey
);
872 logevent("Encrypted session key");
874 cipher_type
= cfg
.cipher
== CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH
:
875 cfg
.cipher
== CIPHER_DES ? SSH_CIPHER_DES
:
877 if ((supported_ciphers_mask
& (1 << cipher_type
)) == 0) {
878 c_write("Selected cipher not supported, falling back to 3DES\r\n", 53);
879 cipher_type
= SSH_CIPHER_3DES
;
881 switch (cipher_type
) {
882 case SSH_CIPHER_3DES
: logevent("Using 3DES encryption"); break;
883 case SSH_CIPHER_DES
: logevent("Using single-DES encryption"); break;
884 case SSH_CIPHER_BLOWFISH
: logevent("Using Blowfish encryption"); break;
887 send_packet(SSH1_CMSG_SESSION_KEY
,
888 PKT_CHAR
, cipher_type
,
890 PKT_CHAR
, (len
*8) >> 8, PKT_CHAR
, (len
*8) & 0xFF,
891 PKT_DATA
, rsabuf
, len
,
895 logevent("Trying to enable encryption...");
899 cipher
= cipher_type
== SSH_CIPHER_BLOWFISH ?
&ssh_blowfish
:
900 cipher_type
== SSH_CIPHER_DES ?
&ssh_des
:
902 cipher
->sesskey(session_key
);
906 if (pktin
.type
!= SSH1_SMSG_SUCCESS
)
907 fatalbox("Encryption not successfully enabled");
909 logevent("Successfully started encryption");
913 static char username
[100];
916 if (!IS_SCP
&& !*cfg
.username
) {
917 c_write("login as: ", 10);
920 while (inlen
--) switch (c
= *in
++) {
942 if (((c
>= ' ' && c
<= '~') ||
943 ((unsigned char)c
>= 160)) && pos
< 40) {
951 username
[strcspn(username
, "\n\r")] = '\0';
954 strncpy(username
, cfg
.username
, 99);
957 sprintf(stuff
, "Sent username \"%s\".\r\n", username
);
958 c_write(stuff
, strlen(stuff
));
962 send_packet(SSH1_CMSG_USER
, PKT_STR
, username
, PKT_END
);
964 char userlog
[20+sizeof(username
)];
965 sprintf(userlog
, "Sent username \"%s\"", username
);
972 while (pktin
.type
== SSH1_SMSG_FAILURE
) {
973 static char password
[100];
976 static int pwpkt_type
;
979 * Show password prompt, having first obtained it via a TIS
980 * exchange if we're doing TIS authentication.
982 pwpkt_type
= SSH1_CMSG_AUTH_PASSWORD
;
986 sprintf(prompt
, "%s@%s's password: ", cfg
.username
, savedhost
);
987 if (!ssh_get_password(prompt
, password
, sizeof(password
))) {
989 * get_password failed to get a password (for
990 * example because one was supplied on the command
991 * line which has already failed to work).
994 logevent("No more passwords to try");
995 ssh_state
= SSH_STATE_CLOSED
;
1000 if (pktin
.type
== SSH1_SMSG_FAILURE
&&
1002 (supported_auths_mask
& (1<<SSH1_AUTH_TIS
))) {
1003 pwpkt_type
= SSH1_CMSG_AUTH_TIS_RESPONSE
;
1004 logevent("Requested TIS authentication");
1005 send_packet(SSH1_CMSG_AUTH_TIS
, PKT_END
);
1007 if (pktin
.type
!= SSH1_SMSG_AUTH_TIS_CHALLENGE
) {
1008 logevent("TIS authentication declined");
1009 c_write("TIS authentication refused.\r\n", 29);
1011 int challengelen
= ((pktin
.body
[0] << 24) |
1012 (pktin
.body
[1] << 16) |
1013 (pktin
.body
[2] << 8) |
1015 logevent("Received TIS challenge");
1016 c_write(pktin
.body
+4, challengelen
);
1019 if (pwpkt_type
== SSH1_CMSG_AUTH_PASSWORD
)
1020 c_write("password: ", 10);
1024 crWaitUntil(!ispkt
);
1025 while (inlen
--) switch (c
= *in
++) {
1042 if (((c
>= ' ' && c
<= '~') ||
1043 ((unsigned char)c
>= 160)) && pos
< 40)
1044 password
[pos
++] = c
;
1052 send_packet(pwpkt_type
, PKT_STR
, password
, PKT_END
);
1053 logevent("Sent password");
1054 memset(password
, 0, strlen(password
));
1056 if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1057 c_write("Access denied\r\n", 15);
1058 logevent("Authentication refused");
1059 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1060 logevent("Received disconnect request");
1061 ssh_state
= SSH_STATE_CLOSED
;
1063 } else if (pktin
.type
!= SSH1_SMSG_SUCCESS
) {
1064 fatalbox("Strange packet received, type %d", pktin
.type
);
1068 logevent("Authentication successful");
1073 static void ssh1_protocol(unsigned char *in
, int inlen
, int ispkt
) {
1078 while (!do_ssh1_login(in
, inlen
, ispkt
)) {
1081 if (ssh_state
== SSH_STATE_CLOSED
)
1085 send_packet(SSH1_CMSG_REQUEST_PTY
,
1086 PKT_STR
, cfg
.termtype
,
1087 PKT_INT
, rows
, PKT_INT
, cols
,
1088 PKT_INT
, 0, PKT_INT
, 0,
1091 ssh_state
= SSH_STATE_INTERMED
;
1092 do { crReturnV
; } while (!ispkt
);
1093 if (pktin
.type
!= SSH1_SMSG_SUCCESS
&& pktin
.type
!= SSH1_SMSG_FAILURE
) {
1094 fatalbox("Protocol confusion");
1095 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1096 c_write("Server refused to allocate pty\r\n", 32);
1098 logevent("Allocated pty");
1101 send_packet(SSH1_CMSG_EXEC_SHELL
, PKT_END
);
1102 logevent("Started session");
1104 ssh_state
= SSH_STATE_SESSION
;
1111 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
||
1112 pktin
.type
== SSH1_SMSG_STDERR_DATA
) {
1113 long len
= GET_32BIT(pktin
.body
);
1114 c_write(pktin
.body
+4, len
);
1115 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1116 ssh_state
= SSH_STATE_CLOSED
;
1117 logevent("Received disconnect request");
1118 } else if (pktin
.type
== SSH1_SMSG_SUCCESS
) {
1119 /* may be from EXEC_SHELL on some servers */
1120 } else if (pktin
.type
== SSH1_SMSG_FAILURE
) {
1121 /* may be from EXEC_SHELL on some servers
1122 * if no pty is available or in other odd cases. Ignore */
1123 } else if (pktin
.type
== SSH1_SMSG_EXIT_STATUS
) {
1124 send_packet(SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
1126 fatalbox("Strange packet received: type %d", pktin
.type
);
1129 send_packet(SSH1_CMSG_STDIN_DATA
,
1130 PKT_INT
, inlen
, PKT_DATA
, in
, inlen
, PKT_END
);
1138 * SSH2 packet construction functions.
1140 void ssh2_pkt_adddata(void *data
, int len
) {
1141 pktout
.length
+= len
;
1142 if (pktout
.maxlen
< pktout
.length
) {
1143 pktout
.maxlen
= pktout
.length
+ 256;
1144 pktout
.data
= (pktout
.data
== NULL ?
malloc(pktout
.maxlen
+APIEXTRA
) :
1145 realloc(pktout
.data
, pktout
.maxlen
+APIEXTRA
));
1147 fatalbox("Out of memory");
1149 memcpy(pktout
.data
+pktout
.length
-len
, data
, len
);
1151 void ssh2_pkt_addbyte(unsigned char byte
) {
1152 ssh2_pkt_adddata(&byte
, 1);
1154 void ssh2_pkt_init(int pkt_type
) {
1156 ssh2_pkt_addbyte((unsigned char)pkt_type
);
1158 void ssh2_pkt_addbool(unsigned char value
) {
1159 ssh2_pkt_adddata(&value
, 1);
1161 void ssh2_pkt_adduint32(unsigned long value
) {
1163 PUT_32BIT(x
, value
);
1164 ssh2_pkt_adddata(x
, 4);
1166 void ssh2_pkt_addstring_start(void) {
1167 ssh2_pkt_adduint32(0);
1168 pktout
.savedpos
= pktout
.length
;
1170 void ssh2_pkt_addstring_str(char *data
) {
1171 ssh2_pkt_adddata(data
, strlen(data
));
1172 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
1173 pktout
.length
- pktout
.savedpos
);
1175 void ssh2_pkt_addstring_data(char *data
, int len
) {
1176 ssh2_pkt_adddata(data
, len
);
1177 PUT_32BIT(pktout
.data
+ pktout
.savedpos
- 4,
1178 pktout
.length
- pktout
.savedpos
);
1180 void ssh2_pkt_addstring(char *data
) {
1181 ssh2_pkt_addstring_start();
1182 ssh2_pkt_addstring_str(data
);
1184 char *ssh2_mpint_fmt(Bignum b
, int *len
) {
1187 p
= malloc(n
* 2 + 1);
1189 fatalbox("out of memory");
1191 for (i
= 0; i
< n
; i
++) {
1192 p
[i
*2+1] = (b
[n
-i
] >> 8) & 0xFF;
1193 p
[i
*2+2] = (b
[n
-i
] ) & 0xFF;
1196 while (p
[i
] == 0 && (p
[i
+1] & 0x80) == 0)
1198 memmove(p
, p
+i
, n
*2+1-i
);
1202 void ssh2_pkt_addmp(Bignum b
) {
1205 p
= ssh2_mpint_fmt(b
, &len
);
1206 ssh2_pkt_addstring_start();
1207 ssh2_pkt_addstring_data(p
, len
);
1210 void ssh2_pkt_send(void) {
1211 int cipherblk
, maclen
, padding
, i
;
1212 static unsigned long outgoing_sequence
= 0;
1215 * Add padding. At least four bytes, and must also bring total
1216 * length (minus MAC) up to a multiple of the block size.
1218 cipherblk
= cipher ? cipher
->blksize
: 8; /* block size */
1219 cipherblk
= cipherblk
< 8 ?
8 : cipherblk
; /* or 8 if blksize < 8 */
1221 padding
+= (cipherblk
- (pktout
.length
+ padding
) % cipherblk
) % cipherblk
;
1222 pktout
.data
[4] = padding
;
1223 for (i
= 0; i
< padding
; i
++)
1224 pktout
.data
[pktout
.length
+ i
] = random_byte();
1225 PUT_32BIT(pktout
.data
, pktout
.length
+ padding
- 4);
1227 csmac
->generate(pktout
.data
, pktout
.length
+ padding
,
1229 outgoing_sequence
++; /* whether or not we MACed */
1231 cscipher
->encrypt(pktout
.data
, pktout
.length
+ padding
);
1232 maclen
= csmac ? csmac
->len
: 0;
1234 debug(("Sending packet len=%d\r\n", pktout
.length
+padding
+maclen
));
1235 for (i
= 0; i
< pktout
.length
+padding
+maclen
; i
++)
1236 debug((" %02x", (unsigned char)pktout
.data
[i
]));
1239 s_write(pktout
.data
, pktout
.length
+ padding
+ maclen
);
1242 void sha_mpint(SHA_State
*s
, Bignum b
) {
1245 p
= ssh2_mpint_fmt(b
, &len
);
1246 sha_string(s
, p
, len
);
1251 * SSH2 packet decode functions.
1253 void ssh2_pkt_getstring(char **p
, int *length
) {
1255 if (pktin
.length
- pktin
.savedpos
< 4)
1257 *length
= GET_32BIT(pktin
.data
+pktin
.savedpos
);
1258 pktin
.savedpos
+= 4;
1259 if (pktin
.length
- pktin
.savedpos
< *length
)
1261 *p
= pktin
.data
+pktin
.savedpos
;
1262 pktin
.savedpos
+= *length
;
1264 Bignum
ssh2_pkt_getmp(void) {
1269 ssh2_pkt_getstring(&p
, &length
);
1273 fatalbox("internal error: Can't handle negative mpints");
1274 b
= newbn((length
+1)/2);
1275 for (i
= 0; i
< length
; i
++) {
1278 b
[j
/2+1] |= ((unsigned char)p
[i
]) << 8;
1280 b
[j
/2+1] |= ((unsigned char)p
[i
]);
1285 void bndebug(char *string
, Bignum b
) {
1288 p
= ssh2_mpint_fmt(b
, &len
);
1289 debug(("%s", string
));
1290 for (i
= 0; i
< len
; i
++)
1291 debug((" %02x", p
[i
]));
1297 * Utility routine for decoding comma-separated strings in KEXINIT.
1299 int in_commasep_string(char *needle
, char *haystack
, int haylen
) {
1300 int needlen
= strlen(needle
);
1303 * Is it at the start of the string?
1305 if (haylen
>= needlen
&& /* haystack is long enough */
1306 !memcmp(needle
, haystack
, needlen
) && /* initial match */
1307 (haylen
== needlen
|| haystack
[needlen
] == ',')
1308 /* either , or EOS follows */
1312 * If not, search for the next comma and resume after that.
1313 * If no comma found, terminate.
1315 while (haylen
> 0 && *haystack
!= ',')
1316 haylen
--, haystack
++;
1319 haylen
--, haystack
++; /* skip over comma itself */
1324 * SSH2 key creation method.
1326 void ssh2_mkkey(Bignum K
, char *H
, char chr
, char *keyspace
) {
1328 /* First 20 bytes. */
1331 SHA_Bytes(&s
, H
, 20);
1332 SHA_Bytes(&s
, &chr
, 1);
1333 SHA_Bytes(&s
, H
, 20);
1334 SHA_Final(&s
, keyspace
);
1335 /* Next 20 bytes. */
1338 SHA_Bytes(&s
, H
, 20);
1339 SHA_Bytes(&s
, keyspace
, 20);
1340 SHA_Final(&s
, keyspace
+20);
1344 * Handle the SSH2 key exchange phase.
1346 static int do_ssh2_kex(unsigned char *in
, int inlen
, int ispkt
)
1350 static Bignum e
, f
, K
;
1351 static struct ssh_cipher
*cscipher_tobe
= NULL
;
1352 static struct ssh_cipher
*sccipher_tobe
= NULL
;
1353 static struct ssh_mac
*csmac_tobe
= NULL
;
1354 static struct ssh_mac
*scmac_tobe
= NULL
;
1355 static struct ssh_compress
*cscomp_tobe
= NULL
;
1356 static struct ssh_compress
*sccomp_tobe
= NULL
;
1357 static char *hostkeydata
, *sigdata
;
1358 static int hostkeylen
, siglen
;
1359 static unsigned char exchange_hash
[20];
1360 static unsigned char keyspace
[40];
1365 * Construct and send our key exchange packet.
1367 ssh2_pkt_init(SSH2_MSG_KEXINIT
);
1368 for (i
= 0; i
< 16; i
++)
1369 ssh2_pkt_addbyte((unsigned char)random_byte());
1370 /* List key exchange algorithms. */
1371 ssh2_pkt_addstring_start();
1372 for (i
= 0; i
< lenof(kex_algs
); i
++) {
1373 ssh2_pkt_addstring_str(kex_algs
[i
]->name
);
1374 if (i
< lenof(kex_algs
)-1)
1375 ssh2_pkt_addstring_str(",");
1377 /* List server host key algorithms. */
1378 ssh2_pkt_addstring_start();
1379 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
1380 ssh2_pkt_addstring_str(hostkey_algs
[i
]->name
);
1381 if (i
< lenof(hostkey_algs
)-1)
1382 ssh2_pkt_addstring_str(",");
1384 /* List client->server encryption algorithms. */
1385 ssh2_pkt_addstring_start();
1386 for (i
= 0; i
< lenof(ciphers
); i
++) {
1387 ssh2_pkt_addstring_str(ciphers
[i
]->name
);
1388 if (i
< lenof(ciphers
)-1)
1389 ssh2_pkt_addstring_str(",");
1391 /* List server->client encryption algorithms. */
1392 ssh2_pkt_addstring_start();
1393 for (i
= 0; i
< lenof(ciphers
); i
++) {
1394 ssh2_pkt_addstring_str(ciphers
[i
]->name
);
1395 if (i
< lenof(ciphers
)-1)
1396 ssh2_pkt_addstring_str(",");
1398 /* List client->server MAC algorithms. */
1399 ssh2_pkt_addstring_start();
1400 for (i
= 0; i
< lenof(macs
); i
++) {
1401 ssh2_pkt_addstring_str(macs
[i
]->name
);
1402 if (i
< lenof(macs
)-1)
1403 ssh2_pkt_addstring_str(",");
1405 /* List server->client MAC algorithms. */
1406 ssh2_pkt_addstring_start();
1407 for (i
= 0; i
< lenof(macs
); i
++) {
1408 ssh2_pkt_addstring_str(macs
[i
]->name
);
1409 if (i
< lenof(macs
)-1)
1410 ssh2_pkt_addstring_str(",");
1412 /* List client->server compression algorithms. */
1413 ssh2_pkt_addstring_start();
1414 for (i
= 0; i
< lenof(compressions
); i
++) {
1415 ssh2_pkt_addstring_str(compressions
[i
]->name
);
1416 if (i
< lenof(compressions
)-1)
1417 ssh2_pkt_addstring_str(",");
1419 /* List server->client compression algorithms. */
1420 ssh2_pkt_addstring_start();
1421 for (i
= 0; i
< lenof(compressions
); i
++) {
1422 ssh2_pkt_addstring_str(compressions
[i
]->name
);
1423 if (i
< lenof(compressions
)-1)
1424 ssh2_pkt_addstring_str(",");
1426 /* List client->server languages. Empty list. */
1427 ssh2_pkt_addstring_start();
1428 /* List server->client languages. Empty list. */
1429 ssh2_pkt_addstring_start();
1430 /* First KEX packet does _not_ follow, because we're not that brave. */
1431 ssh2_pkt_addbool(FALSE
);
1433 ssh2_pkt_adduint32(0);
1434 sha_string(&exhash
, pktout
.data
+5, pktout
.length
-5);
1437 if (!ispkt
) crWaitUntil(ispkt
);
1438 sha_string(&exhash
, pktin
.data
+5, pktin
.length
-5);
1441 * Now examine the other side's KEXINIT to see what we're up
1444 if (pktin
.type
!= SSH2_MSG_KEXINIT
)
1445 fatalbox("expected key exchange packet from server");
1446 kex
= NULL
; hostkey
= NULL
; cscipher_tobe
= NULL
; sccipher_tobe
= NULL
;
1447 csmac_tobe
= NULL
; scmac_tobe
= NULL
; cscomp_tobe
= NULL
; sccomp_tobe
= NULL
;
1448 pktin
.savedpos
+= 16; /* skip garbage cookie */
1449 ssh2_pkt_getstring(&str
, &len
); /* key exchange algorithms */
1450 for (i
= 0; i
< lenof(kex_algs
); i
++) {
1451 if (in_commasep_string(kex_algs
[i
]->name
, str
, len
)) {
1456 ssh2_pkt_getstring(&str
, &len
); /* host key algorithms */
1457 for (i
= 0; i
< lenof(hostkey_algs
); i
++) {
1458 if (in_commasep_string(hostkey_algs
[i
]->name
, str
, len
)) {
1459 hostkey
= hostkey_algs
[i
];
1463 ssh2_pkt_getstring(&str
, &len
); /* client->server cipher */
1464 for (i
= 0; i
< lenof(ciphers
); i
++) {
1465 if (in_commasep_string(ciphers
[i
]->name
, str
, len
)) {
1466 cscipher_tobe
= ciphers
[i
];
1470 ssh2_pkt_getstring(&str
, &len
); /* server->client cipher */
1471 for (i
= 0; i
< lenof(ciphers
); i
++) {
1472 if (in_commasep_string(ciphers
[i
]->name
, str
, len
)) {
1473 sccipher_tobe
= ciphers
[i
];
1477 ssh2_pkt_getstring(&str
, &len
); /* client->server mac */
1478 for (i
= 0; i
< lenof(macs
); i
++) {
1479 if (in_commasep_string(macs
[i
]->name
, str
, len
)) {
1480 csmac_tobe
= macs
[i
];
1484 ssh2_pkt_getstring(&str
, &len
); /* server->client mac */
1485 for (i
= 0; i
< lenof(macs
); i
++) {
1486 if (in_commasep_string(macs
[i
]->name
, str
, len
)) {
1487 scmac_tobe
= macs
[i
];
1491 ssh2_pkt_getstring(&str
, &len
); /* client->server compression */
1492 for (i
= 0; i
< lenof(compressions
); i
++) {
1493 if (in_commasep_string(compressions
[i
]->name
, str
, len
)) {
1494 cscomp_tobe
= compressions
[i
];
1498 ssh2_pkt_getstring(&str
, &len
); /* server->client compression */
1499 for (i
= 0; i
< lenof(compressions
); i
++) {
1500 if (in_commasep_string(compressions
[i
]->name
, str
, len
)) {
1501 sccomp_tobe
= compressions
[i
];
1505 debug(("key exchange is %s\r\n", kex ? kex
->name
: NULL
));
1506 debug(("host key alg is %s\r\n", hostkey ? hostkey
->name
: NULL
));
1507 debug(("cscipher alg is %s\r\n", cscipher_tobe ? cscipher_tobe
->name
: NULL
));
1508 debug(("sccipher alg is %s\r\n", sccipher_tobe ? sccipher_tobe
->name
: NULL
));
1509 debug(("csmac alg is %s\r\n", csmac_tobe ? csmac_tobe
->name
: NULL
));
1510 debug(("scmac alg is %s\r\n", scmac_tobe ? scmac_tobe
->name
: NULL
));
1511 debug(("cscomp alg is %s\r\n", cscomp_tobe ? cscomp_tobe
->name
: NULL
));
1512 debug(("sccomp alg is %s\r\n", sccomp_tobe ? sccomp_tobe
->name
: NULL
));
1515 * Currently we only support Diffie-Hellman and DSS, so let's
1516 * bomb out if those aren't selected.
1518 if (kex
!= &ssh_diffiehellman
|| hostkey
!= &ssh_dss
)
1519 fatalbox("internal fault: chaos in SSH 2 transport layer");
1522 * Now we begin the fun. Generate and send e for Diffie-Hellman.
1526 ssh2_pkt_init(SSH2_MSG_KEXDH_INIT
);
1531 if (pktin
.type
!= SSH2_MSG_KEXDH_REPLY
)
1532 fatalbox("expected key exchange packet from server");
1533 ssh2_pkt_getstring(&hostkeydata
, &hostkeylen
);
1534 f
= ssh2_pkt_getmp();
1536 ssh2_pkt_getstring(&sigdata
, &siglen
);
1541 sha_string(&exhash
, hostkeydata
, hostkeylen
);
1542 sha_mpint(&exhash
, e
);
1543 sha_mpint(&exhash
, f
);
1544 sha_mpint(&exhash
, K
);
1545 SHA_Final(&exhash
, exchange_hash
);
1547 debug(("Exchange hash is:\r\n"));
1548 for (i
= 0; i
< 20; i
++)
1549 debug((" %02x", exchange_hash
[i
]));
1553 * FIXME: verify host key. This bit will be moderately
1554 * unpleasant, because of having to rewrite it to work
1555 * alongside the old scheme.
1559 * FIXME: verify signature of exchange hash.
1563 * Send SSH2_MSG_NEWKEYS. Expect it from server.
1565 ssh2_pkt_init(SSH2_MSG_NEWKEYS
);
1568 if (pktin
.type
!= SSH2_MSG_NEWKEYS
)
1569 fatalbox("expected new-keys packet from server");
1572 * Create and initialise session keys.
1574 cscipher
= cscipher_tobe
;
1575 sccipher
= sccipher_tobe
;
1578 cscomp
= cscomp_tobe
;
1579 sccomp
= sccomp_tobe
;
1581 * Set IVs after keys.
1583 ssh2_mkkey(K
, exchange_hash
, 'C', keyspace
); cscipher
->setcskey(keyspace
);
1584 ssh2_mkkey(K
, exchange_hash
, 'D', keyspace
); cscipher
->setsckey(keyspace
);
1585 ssh2_mkkey(K
, exchange_hash
, 'A', keyspace
); cscipher
->setcsiv(keyspace
);
1586 ssh2_mkkey(K
, exchange_hash
, 'B', keyspace
); sccipher
->setsciv(keyspace
);
1587 ssh2_mkkey(K
, exchange_hash
, 'E', keyspace
); csmac
->setcskey(keyspace
);
1588 ssh2_mkkey(K
, exchange_hash
, 'F', keyspace
); scmac
->setsckey(keyspace
);
1591 * Now we're encrypting. Send a test packet (FIXME).
1593 crWaitUntil(!ispkt
);
1594 ssh2_pkt_init(SSH2_MSG_IGNORE
);
1595 ssh2_pkt_addstring("oo-er");
1603 static void ssh2_protocol(unsigned char *in
, int inlen
, int ispkt
) {
1608 while (!do_ssh2_kex(in
, inlen
, ispkt
)) {
1616 * Called to set up the connection. Will arrange for WM_NETEVENT
1617 * messages to be passed to the specified window, whose window
1618 * procedure should then call telnet_msg().
1620 * Returns an error message, or NULL on success.
1622 static char *ssh_init (HWND hwnd
, char *host
, int port
, char **realhost
) {
1626 if(crypto_startup() == 0)
1627 return "Microsoft high encryption pack not installed!";
1630 p
= connect_to_host(host
, port
, realhost
);
1635 return "Protocol initialisation error";
1637 if (WSAAsyncSelect (s
, hwnd
, WM_NETEVENT
, FD_READ
| FD_CLOSE
) == SOCKET_ERROR
)
1638 switch (WSAGetLastError()) {
1639 case WSAENETDOWN
: return "Network is down";
1640 default: return "WSAAsyncSelect(): unknown error";
1647 * Process a WM_NETEVENT message. Will return 0 if the connection
1648 * has closed, or <0 for a socket error.
1650 static int ssh_msg (WPARAM wParam
, LPARAM lParam
) {
1655 * Because reading less than the whole of the available pending
1656 * data can generate an FD_READ event, we need to allow for the
1657 * possibility that FD_READ may arrive with FD_CLOSE already in
1658 * the queue; so it's possible that we can get here even with s
1659 * invalid. If so, we return 1 and don't worry about it.
1661 if (s
== INVALID_SOCKET
)
1664 if (WSAGETSELECTERROR(lParam
) != 0)
1665 return -WSAGETSELECTERROR(lParam
);
1667 switch (WSAGETSELECTEVENT(lParam
)) {
1670 ret
= recv(s
, buf
, sizeof(buf
), 0);
1671 if (ret
< 0 && WSAGetLastError() == WSAEWOULDBLOCK
)
1673 if (ret
< 0) /* any _other_ error */
1674 return -10000-WSAGetLastError();
1679 ssh_gotdata (buf
, ret
);
1680 if (ssh_state
== SSH_STATE_CLOSED
) {
1687 return 1; /* shouldn't happen, but WTF */
1691 * Called to send data down the Telnet connection.
1693 static void ssh_send (char *buf
, int len
) {
1694 if (s
== INVALID_SOCKET
)
1697 ssh_protocol(buf
, len
, 0);
1701 * Called to set the size of the window from Telnet's POV.
1703 static void ssh_size(void) {
1704 switch (ssh_state
) {
1705 case SSH_STATE_BEFORE_SIZE
:
1706 case SSH_STATE_CLOSED
:
1707 break; /* do nothing */
1708 case SSH_STATE_INTERMED
:
1709 size_needed
= TRUE
; /* buffer for later */
1711 case SSH_STATE_SESSION
:
1713 send_packet(SSH1_CMSG_WINDOW_SIZE
,
1714 PKT_INT
, rows
, PKT_INT
, cols
,
1715 PKT_INT
, 0, PKT_INT
, 0, PKT_END
);
1721 * (Send Telnet special codes)
1723 static void ssh_special (Telnet_Special code
) {
1729 * Read and decrypt one incoming SSH packet.
1730 * (only used by pSCP)
1732 static void get_packet(void)
1734 unsigned char buf
[4096], *p
;
1743 while ((to_read
= s_rdpkt(&p
, &len
)) > 0) {
1744 if (to_read
> sizeof(buf
)) to_read
= sizeof(buf
);
1745 len
= s_read(buf
, to_read
);
1746 if (len
!= to_read
) {
1758 * Receive a block of data over the SSH link. Block until
1759 * all data is available. Return nr of bytes read (0 if lost connection).
1760 * (only used by pSCP)
1762 int ssh_scp_recv(unsigned char *buf
, int len
)
1764 static int pending_input_len
= 0;
1765 static unsigned char *pending_input_ptr
;
1770 if (pending_input_len
>= to_read
) {
1771 memcpy(buf
, pending_input_ptr
, to_read
);
1772 pending_input_ptr
+= to_read
;
1773 pending_input_len
-= to_read
;
1777 if (pending_input_len
> 0) {
1778 memcpy(buf
, pending_input_ptr
, pending_input_len
);
1779 buf
+= pending_input_len
;
1780 to_read
-= pending_input_len
;
1781 pending_input_len
= 0;
1784 if (s
== INVALID_SOCKET
)
1786 while (to_read
> 0) {
1788 if (s
== INVALID_SOCKET
)
1790 if (pktin
.type
== SSH1_SMSG_STDOUT_DATA
) {
1791 int plen
= GET_32BIT(pktin
.body
);
1792 if (plen
<= to_read
) {
1793 memcpy(buf
, pktin
.body
+ 4, plen
);
1797 memcpy(buf
, pktin
.body
+ 4, to_read
);
1798 pending_input_len
= plen
- to_read
;
1799 pending_input_ptr
= pktin
.body
+ 4 + to_read
;
1802 } else if (pktin
.type
== SSH1_SMSG_STDERR_DATA
) {
1803 int plen
= GET_32BIT(pktin
.body
);
1804 fwrite(pktin
.body
+ 4, plen
, 1, stderr
);
1805 } else if (pktin
.type
== SSH1_MSG_DISCONNECT
) {
1806 logevent("Received disconnect request");
1807 } else if (pktin
.type
== SSH1_SMSG_SUCCESS
||
1808 pktin
.type
== SSH1_SMSG_FAILURE
) {
1810 } else if (pktin
.type
== SSH1_SMSG_EXIT_STATUS
) {
1812 sprintf(logbuf
, "Remote exit status: %d", GET_32BIT(pktin
.body
));
1814 send_packet(SSH1_CMSG_EXIT_CONFIRMATION
, PKT_END
);
1815 logevent("Closing connection");
1819 fatalbox("Strange packet received: type %d", pktin
.type
);
1827 * Send a block of data over the SSH link.
1828 * Block until all data is sent.
1829 * (only used by pSCP)
1831 void ssh_scp_send(unsigned char *buf
, int len
)
1834 if (s
== INVALID_SOCKET
)
1836 send_packet(SSH1_CMSG_STDIN_DATA
,
1837 PKT_INT
, len
, PKT_DATA
, buf
, len
, PKT_END
);
1841 * Send an EOF notification to the server.
1842 * (only used by pSCP)
1844 void ssh_scp_send_eof(void)
1847 if (s
== INVALID_SOCKET
)
1849 send_packet(SSH1_CMSG_EOF
, PKT_END
);
1853 * Set up the connection, login on the remote host and
1854 * start execution of a command.
1855 * Returns an error message, or NULL on success.
1856 * (only used by pSCP)
1858 char *ssh_scp_init(char *host
, int port
, char *cmd
, char **realhost
)
1865 if (crypto_startup() == 0)
1866 return "Microsoft high encryption pack not installed!";
1869 p
= connect_to_host(host
, port
, realhost
);
1876 return "Protocol initialisation error";
1878 /* Exchange keys and login */
1881 if (s
== INVALID_SOCKET
)
1882 return "Connection closed by remote host";
1883 } while (!do_ssh1_login(NULL
, 0, 1));
1885 if (ssh_state
== SSH_STATE_CLOSED
) {
1888 return "Session initialisation error";
1891 /* Execute command */
1892 sprintf(buf
, "Sending command: %.100s", cmd
);
1894 send_packet(SSH1_CMSG_EXEC_CMD
, PKT_STR
, cmd
, PKT_END
);
1900 Backend ssh_backend
= {