18 #define logevent(s) { logevent(s); \
19 if (IS_SCP && (scp_flags & SCP_VERBOSE) != 0) \
20 fprintf(stderr, "%s\n", s); }
22 #define SSH_MSG_DISCONNECT 1
23 #define SSH_SMSG_PUBLIC_KEY 2
24 #define SSH_CMSG_SESSION_KEY 3
25 #define SSH_CMSG_USER 4
26 #define SSH_CMSG_AUTH_PASSWORD 9
27 #define SSH_CMSG_REQUEST_PTY 10
28 #define SSH_CMSG_WINDOW_SIZE 11
29 #define SSH_CMSG_EXEC_SHELL 12
30 #define SSH_CMSG_EXEC_CMD 13
31 #define SSH_SMSG_SUCCESS 14
32 #define SSH_SMSG_FAILURE 15
33 #define SSH_CMSG_STDIN_DATA 16
34 #define SSH_SMSG_STDOUT_DATA 17
35 #define SSH_SMSG_STDERR_DATA 18
36 #define SSH_CMSG_EOF 19
37 #define SSH_SMSG_EXIT_STATUS 20
38 #define SSH_CMSG_EXIT_CONFIRMATION 33
39 #define SSH_MSG_IGNORE 32
40 #define SSH_MSG_DEBUG 36
41 #define SSH_CMSG_AUTH_TIS 39
42 #define SSH_SMSG_AUTH_TIS_CHALLENGE 40
43 #define SSH_CMSG_AUTH_TIS_RESPONSE 41
45 #define SSH_AUTH_TIS 5
47 #define GET_32BIT(cp) \
48 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
49 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
50 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
51 ((unsigned long)(unsigned char)(cp)[3]))
53 #define PUT_32BIT(cp, value) { \
54 (cp)[0] = (unsigned char)((value) >> 24); \
55 (cp)[1] = (unsigned char)((value) >> 16); \
56 (cp)[2] = (unsigned char)((value) >> 8); \
57 (cp)[3] = (unsigned char)(value); }
59 enum { PKT_END, PKT_INT, PKT_CHAR, PKT_DATA, PKT_STR };
61 /* Coroutine mechanics for the sillier bits of the code */
62 #define crBegin1 static int crLine = 0;
63 #define crBegin2 switch(crLine) { case 0:;
64 #define crBegin crBegin1; crBegin2;
65 #define crFinish(z) } crLine = 0; return (z)
66 #define crFinishV } crLine = 0; return
69 crLine=__LINE__; return (z); case __LINE__:;\
73 crLine=__LINE__; return; case __LINE__:;\
75 #define crStop(z) do{ crLine = 0; return (z); }while(0)
76 #define crStopV do{ crLine = 0; return; }while(0)
77 #define crWaitUntil(c) do { crReturn(0); } while (!(c))
79 static SOCKET s = INVALID_SOCKET;
81 static unsigned char session_key[32];
82 static struct ssh_cipher *cipher = NULL;
84 int (*ssh_get_password)(const char *prompt, char *str, int maxlen) = NULL;
86 static char *savedhost;
89 SSH_STATE_BEFORE_SIZE,
93 } ssh_state = SSH_STATE_BEFORE_SIZE;
95 static int size_needed = FALSE;
97 static void s_write (char *buf, int len) {
99 int i = send (s, buf, len, 0);
103 fatalbox("Lost connection while sending");
110 static int s_read (char *buf, int len) {
113 int i = recv (s, buf, len, 0);
117 len -= i, buf += i, ret += i;
124 static void c_write (char *buf, int len) {
126 if (len > 0 && buf[len-1] == '\n') len--;
127 if (len > 0 && buf[len-1] == '\r') len--;
128 if (len > 0) { fwrite(buf, len, 1, stderr); fputc('\n', stderr); }
143 static struct Packet pktin = { 0, 0, NULL, NULL, 0 };
144 static struct Packet pktout = { 0, 0, NULL, NULL, 0 };
146 static void ssh_protocol(unsigned char *in, int inlen, int ispkt);
147 static void ssh_size(void);
151 * Collect incoming data in the incoming packet buffer.
152 * Decihper and verify the packet when it is completely read.
153 * Drop SSH_MSG_DEBUG and SSH_MSG_IGNORE packets.
154 * Update the *data and *datalen variables.
155 * Return the additional nr of bytes needed, or 0 when
156 * a complete packet is available.
158 static int s_rdpkt(unsigned char **data, int *datalen)
160 static long len, pad, biglen, to_read;
161 static unsigned long realcrc, gotcrc;
162 static unsigned char *p;
172 for (i = len = 0; i < 4; i++) {
173 while ((*datalen) == 0)
175 len = (len << 8) + **data;
176 (*data)++, (*datalen)--;
180 if (len == 0x52656d6f) { /* "Remo"te server has closed ... */
181 len = 0x300; /* big enough to carry to end */
187 pktin.length = len - 5;
189 if (pktin.maxlen < biglen) {
190 pktin.maxlen = biglen;
192 /* Allocate enough buffer space for extra block
193 * for MS CryptEncrypt() */
194 pktin.data = (pktin.data == NULL ? malloc(biglen+8) :
195 realloc(pktin.data, biglen+8));
197 pktin.data = (pktin.data == NULL ? malloc(biglen) :
198 realloc(pktin.data, biglen));
201 fatalbox("Out of memory");
206 while (to_read > 0) {
209 while ((*datalen) == 0)
211 if (chunk > (*datalen))
213 memcpy(p, *data, chunk);
221 cipher->decrypt(pktin.data, biglen);
223 pktin.type = pktin.data[pad];
224 pktin.body = pktin.data + pad + 1;
226 realcrc = crc32(pktin.data, biglen-4);
227 gotcrc = GET_32BIT(pktin.data+biglen-4);
228 if (gotcrc != realcrc) {
229 fatalbox("Incorrect CRC received on packet");
232 if (pktin.type == SSH_SMSG_STDOUT_DATA ||
233 pktin.type == SSH_SMSG_STDERR_DATA ||
234 pktin.type == SSH_MSG_DEBUG ||
235 pktin.type == SSH_SMSG_AUTH_TIS_CHALLENGE) {
236 long strlen = GET_32BIT(pktin.body);
237 if (strlen + 4 != pktin.length)
238 fatalbox("Received data packet with bogus string length");
241 if (pktin.type == SSH_MSG_DEBUG) {
242 /* log debug message */
244 int strlen = GET_32BIT(pktin.body);
245 strcpy(buf, "Remote: ");
246 if (strlen > 70) strlen = 70;
247 memcpy(buf+8, pktin.body+4, strlen);
248 buf[8+strlen] = '\0';
251 } else if (pktin.type == SSH_MSG_IGNORE) {
259 static void ssh_gotdata(unsigned char *data, int datalen)
261 while (datalen > 0) {
262 if ( s_rdpkt(&data, &datalen) == 0 ) {
263 ssh_protocol(NULL, 0, 1);
264 if (ssh_state == SSH_STATE_CLOSED) {
272 static void s_wrpkt_start(int type, int len) {
275 len += 5; /* type and CRC */
279 pktout.length = len-5;
280 if (pktout.maxlen < biglen) {
281 pktout.maxlen = biglen;
283 /* Allocate enough buffer space for extra block
284 * for MS CryptEncrypt() */
285 pktout.data = (pktout.data == NULL ? malloc(biglen+12) :
286 realloc(pktout.data, biglen+12));
288 pktout.data = (pktout.data == NULL ? malloc(biglen+4) :
289 realloc(pktout.data, biglen+4));
292 fatalbox("Out of memory");
296 pktout.body = pktout.data+4+pad+1;
299 static void s_wrpkt(void) {
300 int pad, len, biglen, i;
303 len = pktout.length + 5; /* type and CRC */
307 pktout.body[-1] = pktout.type;
308 for (i=0; i<pad; i++)
309 pktout.data[i+4] = random_byte();
310 crc = crc32(pktout.data+4, biglen-4);
311 PUT_32BIT(pktout.data+biglen, crc);
312 PUT_32BIT(pktout.data, len);
315 cipher->encrypt(pktout.data+4, biglen);
317 s_write(pktout.data, biglen+4);
321 * Construct a packet with the specified contents and
322 * send it to the server.
324 static void send_packet(int pkttype, ...)
327 unsigned char *p, *argp, argchar;
328 unsigned long argint;
329 int pktlen, argtype, arglen;
332 va_start(args, pkttype);
333 while ((argtype = va_arg(args, int)) != PKT_END) {
336 (void) va_arg(args, int);
340 (void) va_arg(args, char);
344 (void) va_arg(args, unsigned char *);
345 arglen = va_arg(args, int);
349 argp = va_arg(args, unsigned char *);
350 arglen = strlen(argp);
351 pktlen += 4 + arglen;
359 s_wrpkt_start(pkttype, pktlen);
362 va_start(args, pkttype);
363 while ((argtype = va_arg(args, int)) != PKT_END) {
366 argint = va_arg(args, int);
367 PUT_32BIT(p, argint);
371 argchar = va_arg(args, unsigned char);
376 argp = va_arg(args, unsigned char *);
377 arglen = va_arg(args, int);
378 memcpy(p, argp, arglen);
382 argp = va_arg(args, unsigned char *);
383 arglen = strlen(argp);
384 PUT_32BIT(p, arglen);
385 memcpy(p + 4, argp, arglen);
397 * Connect to specified host and port.
398 * Returns an error message, or NULL on success.
399 * Also places the canonical host name into `realhost'.
401 static char *connect_to_host(char *host, int port, char **realhost)
411 savedhost = malloc(1+strlen(host));
413 fatalbox("Out of memory");
414 strcpy(savedhost, host);
417 port = 22; /* default ssh port */
429 if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) {
430 if ( (h = gethostbyname(host)) == NULL)
431 switch (WSAGetLastError()) {
432 case WSAENETDOWN: return "Network is down";
433 case WSAHOST_NOT_FOUND: case WSANO_DATA:
434 return "Host does not exist";
435 case WSATRY_AGAIN: return "Host not found";
436 default: return "gethostbyname: unknown error";
438 memcpy (&a, h->h_addr, sizeof(a));
439 *realhost = h->h_name;
450 s = socket(AF_INET, SOCK_STREAM, 0);
451 if (s == INVALID_SOCKET)
452 switch (WSAGetLastError()) {
453 case WSAENETDOWN: return "Network is down";
454 case WSAEAFNOSUPPORT: return "TCP/IP support not present";
455 default: return "socket(): unknown error";
459 * Bind to local address.
461 addr.sin_family = AF_INET;
462 addr.sin_addr.s_addr = htonl(INADDR_ANY);
463 addr.sin_port = htons(0);
464 if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR)
465 switch (WSAGetLastError()) {
466 case WSAENETDOWN: return "Network is down";
467 default: return "bind(): unknown error";
471 * Connect to remote address.
473 addr.sin_addr.s_addr = htonl(a);
474 addr.sin_port = htons((short)port);
475 if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR)
476 switch (WSAGetLastError()) {
477 case WSAENETDOWN: return "Network is down";
478 case WSAECONNREFUSED: return "Connection refused";
479 case WSAENETUNREACH: return "Network is unreachable";
480 case WSAEHOSTUNREACH: return "No route to host";
481 default: return "connect(): unknown error";
485 send(s, "connect ", 8, 0);
486 send(s, FWhost, strlen(FWhost), 0);
489 sprintf(buf, " %d\n", FWport);
490 send (s, buf, strlen(buf), 0);
497 static int ssh_versioncmp(char *a, char *b) {
499 unsigned long av, bv;
501 av = strtoul(a, &ae, 10);
502 bv = strtoul(b, &be, 10);
503 if (av != bv) return (av < bv ? -1 : +1);
504 if (*ae == '.') ae++;
505 if (*be == '.') be++;
506 av = strtoul(ae, &ae, 10);
507 bv = strtoul(be, &be, 10);
508 if (av != bv) return (av < bv ? -1 : +1);
512 static int do_ssh_init(void) {
516 char vlog[sizeof(vstring)+20];
521 while (s_read(&c, 1) == 1) {
522 if (c == 'S' && i < 2) i++;
523 else if (c == 'S' && i == 2) i = 2;
524 else if (c == 'H' && i == 2) break;
528 if (s_read(&c,1) != 1 || c != 'S') return 0;
529 if (s_read(&c,1) != 1 || c != 'S') return 0;
530 if (s_read(&c,1) != 1 || c != 'H') return 0;
532 strcpy(vstring, "SSH-");
534 if (s_read(&c,1) != 1 || c != '-') return 0;
537 if (s_read(&c,1) != 1)
539 if (vsp < vstring+sizeof(vstring)-1)
545 } else if (i < sizeof(version)-1)
553 sprintf(vlog, "Server version: %s", vstring);
554 vlog[strcspn(vlog, "\r\n")] = '\0';
557 sprintf(vstring, "SSH-%s-PuTTY\n",
558 (ssh_versioncmp(version, "1.5") <= 0 ? version : "1.5"));
559 sprintf(vlog, "We claim version: %s", vstring);
560 vlog[strcspn(vlog, "\r\n")] = '\0';
562 s_write(vstring, strlen(vstring));
567 * Handle the key exchange and user authentication phases.
569 static int do_ssh_login(unsigned char *in, int inlen, int ispkt)
572 unsigned char session_id[16];
573 unsigned char *rsabuf, *keystr1, *keystr2;
574 unsigned char cookie[8];
575 struct RSAKey servkey, hostkey;
576 struct MD5Context md5c;
577 static unsigned long supported_ciphers_mask, supported_auths_mask;
580 extern struct ssh_cipher ssh_3des;
581 extern struct ssh_cipher ssh_des;
582 extern struct ssh_cipher ssh_blowfish;
586 if (!ispkt) crWaitUntil(ispkt);
588 if (pktin.type != SSH_SMSG_PUBLIC_KEY)
589 fatalbox("Public key packet not received");
591 logevent("Received public keys");
593 memcpy(cookie, pktin.body, 8);
595 i = makekey(pktin.body+8, &servkey, &keystr1);
596 j = makekey(pktin.body+8+i, &hostkey, &keystr2);
599 * Hash the host key and print the hash in the log box. Just as
600 * a last resort in case the registry's host key checking is
601 * compromised, we'll allow the user some ability to verify
605 MD5Update(&md5c, keystr2, hostkey.bytes);
606 MD5Final(session_id, &md5c);
610 logevent("Host key MD5 is:");
612 for (i = 0; i < 16; i++)
613 sprintf(logmsg+strlen(logmsg), "%02x", session_id[i]);
617 supported_ciphers_mask = GET_32BIT(pktin.body+12+i+j);
618 supported_auths_mask = GET_32BIT(pktin.body+16+i+j);
621 MD5Update(&md5c, keystr2, hostkey.bytes);
622 MD5Update(&md5c, keystr1, servkey.bytes);
623 MD5Update(&md5c, pktin.body, 8);
624 MD5Final(session_id, &md5c);
627 session_key[i] = random_byte();
629 len = (hostkey.bytes > servkey.bytes ? hostkey.bytes : servkey.bytes);
631 rsabuf = malloc(len);
633 fatalbox("Out of memory");
636 * Verify the host key.
640 * First format the key into a string.
642 int len = rsastr_len(&hostkey);
643 char *keystr = malloc(len);
645 fatalbox("Out of memory");
646 rsastr_fmt(keystr, &hostkey);
647 verify_ssh_host_key(savedhost, keystr);
651 for (i=0; i<32; i++) {
652 rsabuf[i] = session_key[i];
654 rsabuf[i] ^= session_id[i];
657 if (hostkey.bytes > servkey.bytes) {
658 rsaencrypt(rsabuf, 32, &servkey);
659 rsaencrypt(rsabuf, servkey.bytes, &hostkey);
661 rsaencrypt(rsabuf, 32, &hostkey);
662 rsaencrypt(rsabuf, hostkey.bytes, &servkey);
665 logevent("Encrypted session key");
667 cipher_type = cfg.cipher == CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH :
668 cfg.cipher == CIPHER_DES ? SSH_CIPHER_DES :
670 if ((supported_ciphers_mask & (1 << cipher_type)) == 0) {
671 c_write("Selected cipher not supported, falling back to 3DES\r\n", 53);
672 cipher_type = SSH_CIPHER_3DES;
674 switch (cipher_type) {
675 case SSH_CIPHER_3DES: logevent("Using 3DES encryption"); break;
676 case SSH_CIPHER_DES: logevent("Using single-DES encryption"); break;
677 case SSH_CIPHER_BLOWFISH: logevent("Using Blowfish encryption"); break;
680 send_packet(SSH_CMSG_SESSION_KEY,
681 PKT_CHAR, cipher_type,
683 PKT_CHAR, (len*8) >> 8, PKT_CHAR, (len*8) & 0xFF,
684 PKT_DATA, rsabuf, len,
688 logevent("Trying to enable encryption...");
692 cipher = cipher_type == SSH_CIPHER_BLOWFISH ? &ssh_blowfish :
693 cipher_type == SSH_CIPHER_DES ? &ssh_des :
695 cipher->sesskey(session_key);
699 if (pktin.type != SSH_SMSG_SUCCESS)
700 fatalbox("Encryption not successfully enabled");
702 logevent("Successfully started encryption");
706 static char username[100];
709 if (!IS_SCP && !*cfg.username) {
710 c_write("login as: ", 10);
713 while (inlen--) switch (c = *in++) {
735 if (((c >= ' ' && c <= '~') ||
736 ((unsigned char)c >= 160)) && pos < 40) {
744 username[strcspn(username, "\n\r")] = '\0';
747 strncpy(username, cfg.username, 99);
750 sprintf(stuff, "Sent username \"%s\".\r\n", username);
751 c_write(stuff, strlen(stuff));
755 send_packet(SSH_CMSG_USER, PKT_STR, username, PKT_END);
757 char userlog[20+sizeof(username)];
758 sprintf(userlog, "Sent username \"%s\"", username);
765 while (pktin.type == SSH_SMSG_FAILURE) {
766 static char password[100];
769 static int pwpkt_type;
772 * Show password prompt, having first obtained it via a TIS
773 * exchange if we're doing TIS authentication.
775 pwpkt_type = SSH_CMSG_AUTH_PASSWORD;
779 sprintf(prompt, "%s@%s's password: ", cfg.username, savedhost);
780 if (!ssh_get_password(prompt, password, sizeof(password))) {
782 * get_password failed to get a password (for
783 * example because one was supplied on the command
784 * line which has already failed to work).
787 logevent("No more passwords to try");
788 ssh_state = SSH_STATE_CLOSED;
793 if (pktin.type == SSH_SMSG_FAILURE &&
795 (supported_auths_mask & (1<<SSH_AUTH_TIS))) {
796 pwpkt_type = SSH_CMSG_AUTH_TIS_RESPONSE;
797 logevent("Requested TIS authentication");
798 send_packet(SSH_CMSG_AUTH_TIS, PKT_END);
800 if (pktin.type != SSH_SMSG_AUTH_TIS_CHALLENGE) {
801 logevent("TIS authentication declined");
802 c_write("TIS authentication refused.\r\n", 29);
804 int challengelen = ((pktin.body[0] << 24) |
805 (pktin.body[1] << 16) |
806 (pktin.body[2] << 8) |
808 logevent("Received TIS challenge");
809 c_write(pktin.body+4, challengelen);
812 if (pwpkt_type == SSH_CMSG_AUTH_PASSWORD)
813 c_write("password: ", 10);
818 while (inlen--) switch (c = *in++) {
835 if (((c >= ' ' && c <= '~') ||
836 ((unsigned char)c >= 160)) && pos < 40)
845 send_packet(pwpkt_type, PKT_STR, password, PKT_END);
846 logevent("Sent password");
847 memset(password, 0, strlen(password));
849 if (pktin.type == SSH_SMSG_FAILURE) {
850 c_write("Access denied\r\n", 15);
851 logevent("Authentication refused");
852 } else if (pktin.type == SSH_MSG_DISCONNECT) {
853 logevent("Received disconnect request");
854 ssh_state = SSH_STATE_CLOSED;
856 } else if (pktin.type != SSH_SMSG_SUCCESS) {
857 fatalbox("Strange packet received, type %d", pktin.type);
861 logevent("Authentication successful");
866 static void ssh_protocol(unsigned char *in, int inlen, int ispkt) {
871 while (!do_ssh_login(in, inlen, ispkt)) {
874 if (ssh_state == SSH_STATE_CLOSED)
878 send_packet(SSH_CMSG_REQUEST_PTY,
879 PKT_STR, cfg.termtype,
880 PKT_INT, rows, PKT_INT, cols,
881 PKT_INT, 0, PKT_INT, 0,
884 ssh_state = SSH_STATE_INTERMED;
885 do { crReturnV; } while (!ispkt);
886 if (pktin.type != SSH_SMSG_SUCCESS && pktin.type != SSH_SMSG_FAILURE) {
887 fatalbox("Protocol confusion");
888 } else if (pktin.type == SSH_SMSG_FAILURE) {
889 c_write("Server refused to allocate pty\r\n", 32);
891 logevent("Allocated pty");
894 send_packet(SSH_CMSG_EXEC_SHELL, PKT_END);
895 logevent("Started session");
897 ssh_state = SSH_STATE_SESSION;
904 if (pktin.type == SSH_SMSG_STDOUT_DATA ||
905 pktin.type == SSH_SMSG_STDERR_DATA) {
906 long len = GET_32BIT(pktin.body);
907 c_write(pktin.body+4, len);
908 } else if (pktin.type == SSH_MSG_DISCONNECT) {
909 ssh_state = SSH_STATE_CLOSED;
910 logevent("Received disconnect request");
911 } else if (pktin.type == SSH_SMSG_SUCCESS) {
912 /* may be from EXEC_SHELL on some servers */
913 } else if (pktin.type == SSH_SMSG_FAILURE) {
914 /* may be from EXEC_SHELL on some servers
915 * if no pty is available or in other odd cases. Ignore */
916 } else if (pktin.type == SSH_SMSG_EXIT_STATUS) {
917 send_packet(SSH_CMSG_EXIT_CONFIRMATION, PKT_END);
919 fatalbox("Strange packet received: type %d", pktin.type);
922 send_packet(SSH_CMSG_STDIN_DATA,
923 PKT_INT, inlen, PKT_DATA, in, inlen, PKT_END);
931 * Called to set up the connection. Will arrange for WM_NETEVENT
932 * messages to be passed to the specified window, whose window
933 * procedure should then call telnet_msg().
935 * Returns an error message, or NULL on success.
937 static char *ssh_init (HWND hwnd, char *host, int port, char **realhost) {
941 if(crypto_startup() == 0)
942 return "Microsoft high encryption pack not installed!";
945 p = connect_to_host(host, port, realhost);
950 return "Protocol initialisation error";
952 if (WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ | FD_CLOSE) == SOCKET_ERROR)
953 switch (WSAGetLastError()) {
954 case WSAENETDOWN: return "Network is down";
955 default: return "WSAAsyncSelect(): unknown error";
962 * Process a WM_NETEVENT message. Will return 0 if the connection
963 * has closed, or <0 for a socket error.
965 static int ssh_msg (WPARAM wParam, LPARAM lParam) {
970 * Because reading less than the whole of the available pending
971 * data can generate an FD_READ event, we need to allow for the
972 * possibility that FD_READ may arrive with FD_CLOSE already in
973 * the queue; so it's possible that we can get here even with s
974 * invalid. If so, we return 1 and don't worry about it.
976 if (s == INVALID_SOCKET)
979 if (WSAGETSELECTERROR(lParam) != 0)
980 return -WSAGETSELECTERROR(lParam);
982 switch (WSAGETSELECTEVENT(lParam)) {
985 ret = recv(s, buf, sizeof(buf), 0);
986 if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK)
988 if (ret < 0) /* any _other_ error */
989 return -10000-WSAGetLastError();
994 ssh_gotdata (buf, ret);
995 if (ssh_state == SSH_STATE_CLOSED) {
1002 return 1; /* shouldn't happen, but WTF */
1006 * Called to send data down the Telnet connection.
1008 static void ssh_send (char *buf, int len) {
1009 if (s == INVALID_SOCKET)
1012 ssh_protocol(buf, len, 0);
1016 * Called to set the size of the window from Telnet's POV.
1018 static void ssh_size(void) {
1019 switch (ssh_state) {
1020 case SSH_STATE_BEFORE_SIZE:
1021 case SSH_STATE_CLOSED:
1022 break; /* do nothing */
1023 case SSH_STATE_INTERMED:
1024 size_needed = TRUE; /* buffer for later */
1026 case SSH_STATE_SESSION:
1028 send_packet(SSH_CMSG_WINDOW_SIZE,
1029 PKT_INT, rows, PKT_INT, cols,
1030 PKT_INT, 0, PKT_INT, 0, PKT_END);
1036 * (Send Telnet special codes)
1038 static void ssh_special (Telnet_Special code) {
1044 * Read and decrypt one incoming SSH packet.
1045 * (only used by pSCP)
1047 static void get_packet(void)
1049 unsigned char buf[4096], *p;
1058 while ((to_read = s_rdpkt(&p, &len)) > 0) {
1059 if (to_read > sizeof(buf)) to_read = sizeof(buf);
1060 len = s_read(buf, to_read);
1061 if (len != to_read) {
1073 * Receive a block of data over the SSH link. Block until
1074 * all data is available. Return nr of bytes read (0 if lost connection).
1075 * (only used by pSCP)
1077 int ssh_scp_recv(unsigned char *buf, int len)
1079 static int pending_input_len = 0;
1080 static unsigned char *pending_input_ptr;
1085 if (pending_input_len >= to_read) {
1086 memcpy(buf, pending_input_ptr, to_read);
1087 pending_input_ptr += to_read;
1088 pending_input_len -= to_read;
1092 if (pending_input_len > 0) {
1093 memcpy(buf, pending_input_ptr, pending_input_len);
1094 buf += pending_input_len;
1095 to_read -= pending_input_len;
1096 pending_input_len = 0;
1099 if (s == INVALID_SOCKET)
1101 while (to_read > 0) {
1103 if (s == INVALID_SOCKET)
1105 if (pktin.type == SSH_SMSG_STDOUT_DATA) {
1106 int plen = GET_32BIT(pktin.body);
1107 if (plen <= to_read) {
1108 memcpy(buf, pktin.body + 4, plen);
1112 memcpy(buf, pktin.body + 4, to_read);
1113 pending_input_len = plen - to_read;
1114 pending_input_ptr = pktin.body + 4 + to_read;
1117 } else if (pktin.type == SSH_SMSG_STDERR_DATA) {
1118 int plen = GET_32BIT(pktin.body);
1119 fwrite(pktin.body + 4, plen, 1, stderr);
1120 } else if (pktin.type == SSH_MSG_DISCONNECT) {
1121 logevent("Received disconnect request");
1122 } else if (pktin.type == SSH_SMSG_SUCCESS ||
1123 pktin.type == SSH_SMSG_FAILURE) {
1125 } else if (pktin.type == SSH_SMSG_EXIT_STATUS) {
1127 sprintf(logbuf, "Remote exit status: %d", GET_32BIT(pktin.body));
1129 send_packet(SSH_CMSG_EXIT_CONFIRMATION, PKT_END);
1130 logevent("Closing connection");
1134 fatalbox("Strange packet received: type %d", pktin.type);
1142 * Send a block of data over the SSH link.
1143 * Block until all data is sent.
1144 * (only used by pSCP)
1146 void ssh_scp_send(unsigned char *buf, int len)
1149 if (s == INVALID_SOCKET)
1151 send_packet(SSH_CMSG_STDIN_DATA,
1152 PKT_INT, len, PKT_DATA, buf, len, PKT_END);
1156 * Send an EOF notification to the server.
1157 * (only used by pSCP)
1159 void ssh_scp_send_eof(void)
1162 if (s == INVALID_SOCKET)
1164 send_packet(SSH_CMSG_EOF, PKT_END);
1168 * Set up the connection, login on the remote host and
1169 * start execution of a command.
1170 * Returns an error message, or NULL on success.
1171 * (only used by pSCP)
1173 char *ssh_scp_init(char *host, int port, char *cmd, char **realhost)
1180 if (crypto_startup() == 0)
1181 return "Microsoft high encryption pack not installed!";
1184 p = connect_to_host(host, port, realhost);
1191 return "Protocol initialisation error";
1193 /* Exchange keys and login */
1196 if (s == INVALID_SOCKET)
1197 return "Connection closed by remote host";
1198 } while (!do_ssh_login(NULL, 0, 1));
1200 if (ssh_state == SSH_STATE_CLOSED) {
1203 return "Session initialisation error";
1206 /* Execute command */
1207 sprintf(buf, "Sending command: %.100s", cmd);
1209 send_packet(SSH_CMSG_EXEC_CMD, PKT_STR, cmd, PKT_END);
1215 Backend ssh_backend = {