Annotation of src/usr.bin/ssh/ssh.c, Revision 1.128
1.1 deraadt 1: /*
1.32 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
5: * Ssh client program. This program can be used to log into a remote machine.
6: * The software supports strong authentication, encryption, and forwarding
7: * of X11, TCP/IP, and authentication connections.
8: *
1.64 deraadt 9: * As far as I am concerned, the code I have written for this software
10: * can be used freely for any purpose. Any derived versions of this
11: * software must be clearly marked as such, and if the derived work is
12: * incompatible with the protocol description in the RFC file, it must be
13: * called by a name other than "ssh" or "Secure Shell".
14: *
15: * Copyright (c) 1999 Niels Provos. All rights reserved.
16: *
17: * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
18: * in Canada (German citizen).
19: *
20: * Redistribution and use in source and binary forms, with or without
21: * modification, are permitted provided that the following conditions
22: * are met:
23: * 1. Redistributions of source code must retain the above copyright
24: * notice, this list of conditions and the following disclaimer.
25: * 2. Redistributions in binary form must reproduce the above copyright
26: * notice, this list of conditions and the following disclaimer in the
27: * documentation and/or other materials provided with the distribution.
28: *
29: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
30: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
31: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
32: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 39: */
1.1 deraadt 40:
41: #include "includes.h"
1.128 ! fgsch 42: RCSID("$OpenBSD: ssh.c,v 1.127 2001/06/26 20:14:11 markus Exp $");
1.49 markus 43:
44: #include <openssl/evp.h>
1.72 markus 45: #include <openssl/err.h>
1.1 deraadt 46:
1.84 markus 47: #include "ssh.h"
48: #include "ssh1.h"
49: #include "ssh2.h"
50: #include "compat.h"
51: #include "cipher.h"
1.1 deraadt 52: #include "xmalloc.h"
53: #include "packet.h"
54: #include "buffer.h"
55: #include "uidswap.h"
1.123 markus 56: #include "channels.h"
1.49 markus 57: #include "key.h"
1.58 markus 58: #include "authfd.h"
1.49 markus 59: #include "authfile.h"
1.83 markus 60: #include "pathnames.h"
1.81 markus 61: #include "clientloop.h"
1.84 markus 62: #include "log.h"
63: #include "readconf.h"
64: #include "sshconnect.h"
65: #include "tildexpand.h"
1.89 markus 66: #include "dispatch.h"
1.84 markus 67: #include "misc.h"
1.95 markus 68: #include "kex.h"
69: #include "mac.h"
1.115 stevesk 70: #include "sshtty.h"
1.49 markus 71:
1.127 markus 72: #ifdef SMARTCARD
73: #include <openssl/engine.h>
74: #include "scard.h"
75: #endif
76:
1.49 markus 77: extern char *__progname;
1.1 deraadt 78:
1.37 markus 79: /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
80: Default value is AF_UNSPEC means both IPv4 and IPv6. */
81: int IPv4or6 = AF_UNSPEC;
82:
1.31 markus 83: /* Flag indicating whether debug mode is on. This can be set on the command line. */
1.1 deraadt 84: int debug_flag = 0;
85:
1.46 markus 86: /* Flag indicating whether a tty should be allocated */
1.1 deraadt 87: int tty_flag = 0;
1.79 markus 88: int no_tty_flag = 0;
89: int force_tty_flag = 0;
1.1 deraadt 90:
1.45 markus 91: /* don't exec a shell */
92: int no_shell_flag = 0;
93:
1.33 markus 94: /*
95: * Flag indicating that nothing should be read from stdin. This can be set
96: * on the command line.
97: */
1.1 deraadt 98: int stdin_null_flag = 0;
99:
1.33 markus 100: /*
101: * Flag indicating that ssh should fork after authentication. This is useful
102: * so that the pasphrase can be entered manually, and then ssh goes to the
103: * background.
104: */
1.1 deraadt 105: int fork_after_authentication_flag = 0;
106:
1.33 markus 107: /*
108: * General data structure for command line options and options configurable
109: * in configuration files. See readconf.h.
110: */
1.1 deraadt 111: Options options;
112:
1.33 markus 113: /*
114: * Name of the host we are connecting to. This is the name given on the
115: * command line, or the HostName specified for the user-supplied name in a
116: * configuration file.
117: */
1.1 deraadt 118: char *host;
119:
1.22 provos 120: /* socket address the host resolves to */
1.37 markus 121: struct sockaddr_storage hostaddr;
1.22 provos 122:
1.33 markus 123: /*
124: * Flag to indicate that we have received a window change signal which has
125: * not yet been processed. This will cause a message indicating the new
126: * window size to be sent to the server a little later. This is volatile
127: * because this is updated in a signal handler.
128: */
1.1 deraadt 129: volatile int received_window_change_signal = 0;
130:
1.112 markus 131: /* Private host keys. */
132: struct {
133: Key **keys;
134: int nkeys;
135: } sensitive_data;
1.1 deraadt 136:
1.10 dugsong 137: /* Original real UID. */
138: uid_t original_real_uid;
1.1 deraadt 139:
1.45 markus 140: /* command to be executed */
141: Buffer command;
142:
1.85 djm 143: /* Should we execute a command or invoke a subsystem? */
144: int subsystem_flag = 0;
145:
1.127 markus 146: #ifdef SMARTCARD
147: /* Smartcard reader id */
148: int sc_reader_num = -1;
149: #endif
150:
1.1 deraadt 151: /* Prints a help message to the user. This function never returns. */
152:
1.126 itojun 153: static void
1.93 itojun 154: usage(void)
1.1 deraadt 155: {
1.76 markus 156: fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
1.31 markus 157: fprintf(stderr, "Options:\n");
158: fprintf(stderr, " -l user Log in using this user name.\n");
1.93 itojun 159: fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n");
1.53 markus 160: fprintf(stderr, " -A Enable authentication agent forwarding.\n");
1.120 markus 161: fprintf(stderr, " -a Disable authentication agent forwarding (default).\n");
1.9 dugsong 162: #ifdef AFS
1.31 markus 163: fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n");
164: #endif /* AFS */
1.88 stevesk 165: fprintf(stderr, " -X Enable X11 connection forwarding.\n");
1.120 markus 166: fprintf(stderr, " -x Disable X11 connection forwarding (default).\n");
1.99 deraadt 167: fprintf(stderr, " -i file Identity for public key authentication "
168: "(default: ~/.ssh/identity)\n");
1.31 markus 169: fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
1.45 markus 170: fprintf(stderr, " -T Do not allocate a tty.\n");
1.31 markus 171: fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
1.66 markus 172: fprintf(stderr, " Multiple -v increases verbosity.\n");
1.31 markus 173: fprintf(stderr, " -V Display version number only.\n");
174: fprintf(stderr, " -P Don't allocate a privileged port.\n");
175: fprintf(stderr, " -q Quiet; don't display any warning messages.\n");
176: fprintf(stderr, " -f Fork into background after authentication.\n");
177: fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
178:
1.120 markus 179: fprintf(stderr, " -c cipher Select encryption algorithm\n");
1.102 stevesk 180: fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n");
1.31 markus 181: fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
182: fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
183: fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
1.76 markus 184: fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname);
1.31 markus 185: fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
186: fprintf(stderr, " -C Enable compression.\n");
1.45 markus 187: fprintf(stderr, " -N Do not execute a shell or command.\n");
1.31 markus 188: fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
1.92 jakob 189: fprintf(stderr, " -1 Force protocol version 1.\n");
190: fprintf(stderr, " -2 Force protocol version 2.\n");
1.37 markus 191: fprintf(stderr, " -4 Use IPv4 only.\n");
192: fprintf(stderr, " -6 Use IPv6 only.\n");
1.31 markus 193: fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
1.85 djm 194: fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
1.120 markus 195: fprintf(stderr, " -b addr Local IP address.\n");
1.31 markus 196: exit(1);
1.1 deraadt 197: }
198:
1.32 deraadt 199: /*
200: * Connects to the given host using rsh (or prints an error message and exits
201: * if rsh is not available). This function never returns.
202: */
1.126 itojun 203: static void
1.31 markus 204: rsh_connect(char *host, char *user, Buffer * command)
1.1 deraadt 205: {
1.31 markus 206: char *args[10];
207: int i;
208:
209: log("Using rsh. WARNING: Connection will not be encrypted.");
210: /* Build argument list for rsh. */
211: i = 0;
212: args[i++] = _PATH_RSH;
213: /* host may have to come after user on some systems */
214: args[i++] = host;
215: if (user) {
216: args[i++] = "-l";
217: args[i++] = user;
218: }
219: if (buffer_len(command) > 0) {
220: buffer_append(command, "\0", 1);
221: args[i++] = buffer_ptr(command);
222: }
223: args[i++] = NULL;
224: if (debug_flag) {
225: for (i = 0; args[i]; i++) {
226: if (i != 0)
227: fprintf(stderr, " ");
228: fprintf(stderr, "%s", args[i]);
229: }
230: fprintf(stderr, "\n");
231: }
232: execv(_PATH_RSH, args);
233: perror(_PATH_RSH);
234: exit(1);
1.1 deraadt 235: }
236:
1.126 itojun 237: static int ssh_session(void);
238: static int ssh_session2(void);
239: static void load_public_identity_files(void);
1.45 markus 240:
1.32 deraadt 241: /*
242: * Main program for the ssh client.
243: */
1.2 provos 244: int
245: main(int ac, char **av)
1.1 deraadt 246: {
1.128 ! fgsch 247: int i, opt, exit_status, ok;
1.35 markus 248: u_short fwd_port, fwd_host_port;
1.128 ! fgsch 249: char *p, *cp, buf[256];
1.31 markus 250: struct stat st;
1.98 markus 251: struct passwd *pw;
1.45 markus 252: int dummy;
1.31 markus 253: uid_t original_effective_uid;
254:
1.33 markus 255: /*
256: * Save the original real uid. It will be needed later (uid-swapping
257: * may clobber the real uid).
258: */
1.31 markus 259: original_real_uid = getuid();
260: original_effective_uid = geteuid();
261:
262: /* If we are installed setuid root be careful to not drop core. */
263: if (original_real_uid != original_effective_uid) {
264: struct rlimit rlim;
265: rlim.rlim_cur = rlim.rlim_max = 0;
266: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
267: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 268: }
1.107 markus 269: /* Get user data. */
270: pw = getpwuid(original_real_uid);
271: if (!pw) {
272: log("You don't exist, go away!");
273: exit(1);
274: }
275: /* Take a copy of the returned structure. */
276: pw = pwcopy(pw);
277:
1.33 markus 278: /*
279: * Use uid-swapping to give up root privileges for the duration of
280: * option processing. We will re-instantiate the rights when we are
281: * ready to create the privileged port, and will permanently drop
282: * them when the port has been created (actually, when the connection
283: * has been made, as we may need to create the port several times).
284: */
1.107 markus 285: temporarily_use_uid(pw);
1.31 markus 286:
1.33 markus 287: /*
288: * Set our umask to something reasonable, as some files are created
289: * with the default umask. This will make them world-readable but
290: * writable only by the owner, which is ok for all files for which we
291: * don't set the modes explicitly.
292: */
1.31 markus 293: umask(022);
294:
295: /* Initialize option structure to indicate that no values have been set. */
296: initialize_options(&options);
297:
298: /* Parse command-line arguments. */
299: host = NULL;
300:
1.128 ! fgsch 301: again:
! 302: while ((opt = getopt(ac, av,
! 303: "1246nfxXgpaAki:I:tvVqe:c:m:p:l:R:L:D:CNTo:sb:")) != -1) {
1.31 markus 304: switch (opt) {
1.91 jakob 305: case '1':
306: options.protocol = SSH_PROTO_1;
307: break;
1.47 markus 308: case '2':
309: options.protocol = SSH_PROTO_2;
310: break;
1.37 markus 311: case '4':
312: IPv4or6 = AF_INET;
313: break;
314: case '6':
315: IPv4or6 = AF_INET6;
316: break;
1.31 markus 317: case 'n':
318: stdin_null_flag = 1;
319: break;
320: case 'f':
321: fork_after_authentication_flag = 1;
322: stdin_null_flag = 1;
323: break;
324: case 'x':
325: options.forward_x11 = 0;
326: break;
327: case 'X':
328: options.forward_x11 = 1;
329: break;
330: case 'g':
331: options.gateway_ports = 1;
332: break;
333: case 'P':
334: options.use_privileged_port = 0;
335: break;
336: case 'a':
337: options.forward_agent = 0;
1.53 markus 338: break;
339: case 'A':
340: options.forward_agent = 1;
1.31 markus 341: break;
1.9 dugsong 342: #ifdef AFS
1.31 markus 343: case 'k':
344: options.kerberos_tgt_passing = 0;
345: options.afs_token_passing = 0;
346: break;
1.1 deraadt 347: #endif
1.31 markus 348: case 'i':
349: if (stat(optarg, &st) < 0) {
1.128 ! fgsch 350: fprintf(stderr, "Warning: Identity file %s "
! 351: "does not exist.\n", optarg);
1.31 markus 352: break;
353: }
1.128 ! fgsch 354: if (options.num_identity_files >=
! 355: SSH_MAX_IDENTITY_FILES)
! 356: fatal("Too many identity files specified "
! 357: "(max %d)", SSH_MAX_IDENTITY_FILES);
! 358: options.identity_files[options.num_identity_files++] =
! 359: xstrdup(optarg);
1.31 markus 360: break;
1.127 markus 361: case 'I':
362: #ifdef SMARTCARD
363: sc_reader_num = atoi(optarg);
364: #else
365: fprintf(stderr, "no support for smartcards.\n");
366: #endif
367: break;
1.31 markus 368: case 't':
1.79 markus 369: if (tty_flag)
370: force_tty_flag = 1;
1.31 markus 371: tty_flag = 1;
372: break;
373: case 'v':
1.66 markus 374: if (0 == debug_flag) {
375: debug_flag = 1;
376: options.log_level = SYSLOG_LEVEL_DEBUG1;
377: } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
378: options.log_level++;
379: break;
1.128 ! fgsch 380: } else
1.103 millert 381: fatal("Too high debugging level.");
1.66 markus 382: /* fallthrough */
1.31 markus 383: case 'V':
1.96 deraadt 384: fprintf(stderr,
385: "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n",
1.46 markus 386: SSH_VERSION,
387: PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
1.96 deraadt 388: PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
389: SSLeay());
1.31 markus 390: if (opt == 'V')
391: exit(0);
392: break;
393: case 'q':
394: options.log_level = SYSLOG_LEVEL_QUIET;
395: break;
396: case 'e':
397: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 ! fgsch 398: (u_char) optarg[1] >= 64 &&
! 399: (u_char) optarg[1] < 128)
1.78 markus 400: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 401: else if (strlen(optarg) == 1)
1.78 markus 402: options.escape_char = (u_char) optarg[0];
1.31 markus 403: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 404: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 405: else {
1.128 ! fgsch 406: fprintf(stderr, "Bad escape character '%s'.\n",
! 407: optarg);
1.31 markus 408: exit(1);
409: }
410: break;
411: case 'c':
1.49 markus 412: if (ciphers_valid(optarg)) {
413: /* SSH2 only */
414: options.ciphers = xstrdup(optarg);
1.51 markus 415: options.cipher = SSH_CIPHER_ILLEGAL;
1.49 markus 416: } else {
417: /* SSH1 only */
1.74 markus 418: options.cipher = cipher_number(optarg);
419: if (options.cipher == -1) {
1.128 ! fgsch 420: fprintf(stderr,
! 421: "Unknown cipher type '%s'\n",
! 422: optarg);
1.49 markus 423: exit(1);
424: }
1.128 ! fgsch 425: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 426: options.ciphers = "3des-cbc";
1.128 ! fgsch 427: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 428: options.ciphers = "blowfish-cbc";
1.128 ! fgsch 429: else
1.74 markus 430: options.ciphers = (char *)-1;
1.95 markus 431: }
432: break;
433: case 'm':
434: if (mac_valid(optarg))
435: options.macs = xstrdup(optarg);
436: else {
1.128 ! fgsch 437: fprintf(stderr, "Unknown mac type '%s'\n",
! 438: optarg);
1.95 markus 439: exit(1);
1.31 markus 440: }
441: break;
442: case 'p':
1.113 stevesk 443: options.port = a2port(optarg);
444: if (options.port == 0) {
1.109 markus 445: fprintf(stderr, "Bad port '%s'\n", optarg);
446: exit(1);
447: }
1.31 markus 448: break;
449: case 'l':
450: options.user = optarg;
451: break;
452: case 'R':
1.37 markus 453: if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
454: &fwd_host_port) != 3 &&
455: sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
456: &fwd_host_port) != 3) {
1.128 ! fgsch 457: fprintf(stderr,
! 458: "Bad forwarding specification '%s'.\n",
! 459: optarg);
1.31 markus 460: usage();
461: /* NOTREACHED */
462: }
1.128 ! fgsch 463: add_remote_forward(&options, fwd_port, buf,
! 464: fwd_host_port);
1.31 markus 465: break;
466: case 'L':
1.37 markus 467: if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
468: &fwd_host_port) != 3 &&
469: sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
470: &fwd_host_port) != 3) {
1.128 ! fgsch 471: fprintf(stderr,
! 472: "Bad forwarding specification '%s'.\n",
! 473: optarg);
1.31 markus 474: usage();
475: /* NOTREACHED */
476: }
1.128 ! fgsch 477: add_local_forward(&options, fwd_port, buf,
! 478: fwd_host_port);
1.31 markus 479: break;
1.108 markus 480:
481: case 'D':
1.113 stevesk 482: fwd_port = a2port(optarg);
483: if (fwd_port == 0) {
1.128 ! fgsch 484: fprintf(stderr, "Bad dynamic port '%s'\n",
! 485: optarg);
1.109 markus 486: exit(1);
487: }
1.108 markus 488: add_local_forward(&options, fwd_port, "socks4", 0);
489: break;
490:
1.31 markus 491: case 'C':
492: options.compression = 1;
493: break;
1.45 markus 494: case 'N':
495: no_shell_flag = 1;
496: no_tty_flag = 1;
497: break;
498: case 'T':
499: no_tty_flag = 1;
500: break;
1.31 markus 501: case 'o':
502: dummy = 1;
1.128 ! fgsch 503: if (process_config_line(&options, host ? host : "",
! 504: optarg, "command-line", 0, &dummy) != 0)
1.31 markus 505: exit(1);
506: break;
1.85 djm 507: case 's':
508: subsystem_flag = 1;
1.117 markus 509: break;
510: case 'b':
511: options.bind_address = optarg;
1.85 djm 512: break;
1.31 markus 513: default:
514: usage();
1.1 deraadt 515: }
1.31 markus 516: }
517:
1.128 ! fgsch 518: ac -= optind;
! 519: av += optind;
! 520:
! 521: if (ac > 0 && !host && **av != '-') {
! 522: if (strchr(*av, '@')) {
! 523: p = xstrdup(*av);
! 524: cp = strchr(p, '@');
! 525: if (cp == NULL || cp == p)
! 526: usage();
! 527: options.user = p;
! 528: *cp = '\0';
! 529: host = ++cp;
! 530: } else
! 531: host = *av;
! 532: ac--, av++;
! 533: if (ac > 0) {
! 534: optind = 0;
! 535: optreset = 1;
! 536: goto again;
! 537: }
! 538: }
! 539:
1.31 markus 540: /* Check that we got a host name. */
541: if (!host)
542: usage();
543:
1.54 markus 544: SSLeay_add_all_algorithms();
1.72 markus 545: ERR_load_crypto_strings();
1.31 markus 546:
547: /* Initialize the command to execute on remote host. */
548: buffer_init(&command);
1.1 deraadt 549:
1.33 markus 550: /*
551: * Save the command to execute on the remote host in a buffer. There
552: * is no limit on the length of the command, except by the maximum
553: * packet size. Also sets the tty flag if there is no command.
554: */
1.128 ! fgsch 555: if (!ac) {
1.31 markus 556: /* No command specified - execute shell on a tty. */
557: tty_flag = 1;
1.85 djm 558: if (subsystem_flag) {
1.128 ! fgsch 559: fprintf(stderr,
! 560: "You must specify a subsystem to invoke.\n");
1.85 djm 561: usage();
562: }
1.31 markus 563: } else {
1.128 ! fgsch 564: /* A command has been specified. Store it into the buffer. */
! 565: for (i = 0; i < ac; i++) {
! 566: if (i)
1.31 markus 567: buffer_append(&command, " ", 1);
568: buffer_append(&command, av[i], strlen(av[i]));
569: }
570: }
571:
572: /* Cannot fork to background if no command. */
1.63 markus 573: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 574: fatal("Cannot fork into background without a command to execute.");
575:
576: /* Allocate a tty by default if no command specified. */
577: if (buffer_len(&command) == 0)
578: tty_flag = 1;
579:
1.75 markus 580: /* Force no tty*/
581: if (no_tty_flag)
582: tty_flag = 0;
1.31 markus 583: /* Do not allocate a tty if stdin is not a tty. */
1.79 markus 584: if (!isatty(fileno(stdin)) && !force_tty_flag) {
1.31 markus 585: if (tty_flag)
1.103 millert 586: log("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 587: tty_flag = 0;
588: }
1.45 markus 589:
1.101 markus 590: /*
591: * Initialize "log" output. Since we are the client all output
592: * actually goes to stderr.
593: */
1.111 markus 594: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
595: SYSLOG_FACILITY_USER, 1);
1.31 markus 596:
597: /* Read per-user configuration file. */
1.83 markus 598: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE);
1.31 markus 599: read_config_file(buf, host, &options);
600:
601: /* Read systemwide configuration file. */
1.83 markus 602: read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
1.31 markus 603:
604: /* Fill configuration defaults. */
605: fill_default_options(&options);
606:
607: /* reinit */
1.101 markus 608: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 609:
610: if (options.user == NULL)
611: options.user = xstrdup(pw->pw_name);
612:
613: if (options.hostname != NULL)
614: host = options.hostname;
615:
616: /* Disable rhosts authentication if not running as root. */
617: if (original_effective_uid != 0 || !options.use_privileged_port) {
1.77 markus 618: debug("Rhosts Authentication disabled, "
1.71 markus 619: "originating port will not be trusted.");
1.31 markus 620: options.rhosts_authentication = 0;
621: }
1.33 markus 622: /*
623: * If using rsh has been selected, exec it now (without trying
624: * anything else). Note that we must release privileges first.
625: */
1.31 markus 626: if (options.use_rsh) {
1.33 markus 627: /*
628: * Restore our superuser privileges. This must be done
629: * before permanently setting the uid.
630: */
1.31 markus 631: restore_uid();
632:
633: /* Switch to the original uid permanently. */
1.107 markus 634: permanently_set_uid(pw);
1.31 markus 635:
636: /* Execute rsh. */
637: rsh_connect(host, options.user, &command);
638: fatal("rsh_connect returned");
639: }
640: /* Restore our superuser privileges. */
641: restore_uid();
642:
1.77 markus 643: /* Open a connection to the remote host. */
1.31 markus 644:
645: ok = ssh_connect(host, &hostaddr, options.port,
1.77 markus 646: options.connection_attempts,
647: original_effective_uid != 0 || !options.use_privileged_port,
1.107 markus 648: pw, options.proxy_command);
1.31 markus 649:
1.33 markus 650: /*
651: * If we successfully made the connection, load the host private key
652: * in case we will need it later for combined rsa-rhosts
653: * authentication. This must be done before releasing extra
654: * privileges, because the file is only readable by root.
655: */
1.112 markus 656: sensitive_data.nkeys = 0;
657: sensitive_data.keys = NULL;
658: if (ok && (options.rhosts_rsa_authentication ||
659: options.hostbased_authentication)) {
660: sensitive_data.nkeys = 3;
661: sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key));
662: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.105 markus 663: _PATH_HOST_KEY_FILE, "", NULL);
1.112 markus 664: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
665: _PATH_HOST_DSA_KEY_FILE, "", NULL);
666: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
667: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.31 markus 668: }
1.33 markus 669: /*
670: * Get rid of any extra privileges that we may have. We will no
671: * longer need them. Also, extra privileges could make it very hard
672: * to read identity files and other non-world-readable files from the
673: * user's home directory if it happens to be on a NFS volume where
674: * root is mapped to nobody.
675: */
676:
677: /*
678: * Note that some legacy systems need to postpone the following call
679: * to permanently_set_uid() until the private hostkey is destroyed
680: * with RSA_free(). Otherwise the calling user could ptrace() the
681: * process, read the private hostkey and impersonate the host.
682: * OpenBSD does not allow ptracing of setuid processes.
683: */
1.107 markus 684: permanently_set_uid(pw);
1.31 markus 685:
1.33 markus 686: /*
687: * Now that we are back to our own permissions, create ~/.ssh
688: * directory if it doesn\'t already exist.
689: */
1.83 markus 690: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR);
1.31 markus 691: if (stat(buf, &st) < 0)
1.57 djm 692: if (mkdir(buf, 0700) < 0)
1.31 markus 693: error("Could not create directory '%.200s'.", buf);
694:
695: /* Check if the connection failed, and try "rsh" if appropriate. */
696: if (!ok) {
697: if (options.port != 0)
1.35 markus 698: log("Secure connection to %.100s on port %hu refused%.100s.",
1.31 markus 699: host, options.port,
700: options.fallback_to_rsh ? "; reverting to insecure method" : "");
701: else
702: log("Secure connection to %.100s refused%.100s.", host,
703: options.fallback_to_rsh ? "; reverting to insecure method" : "");
704:
705: if (options.fallback_to_rsh) {
706: rsh_connect(host, options.user, &command);
707: fatal("rsh_connect returned");
708: }
709: exit(1);
710: }
1.104 markus 711: /* load options.identity_files */
712: load_public_identity_files();
713:
714: /* Expand ~ in known host file names. */
715: /* XXX mem-leaks: */
1.72 markus 716: options.system_hostfile =
717: tilde_expand_filename(options.system_hostfile, original_real_uid);
718: options.user_hostfile =
719: tilde_expand_filename(options.user_hostfile, original_real_uid);
720: options.system_hostfile2 =
721: tilde_expand_filename(options.system_hostfile2, original_real_uid);
722: options.user_hostfile2 =
723: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.31 markus 724:
725: /* Log into the remote system. This never returns if the login fails. */
1.112 markus 726: ssh_login(sensitive_data.keys, sensitive_data.nkeys,
727: host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 728:
1.112 markus 729: /* We no longer need the private host keys. Clear them now. */
730: if (sensitive_data.nkeys != 0) {
731: for (i = 0; i < sensitive_data.nkeys; i++) {
732: if (sensitive_data.keys[i] != NULL) {
733: /* Destroys contents safely */
734: debug3("clear hostkey %d", i);
735: key_free(sensitive_data.keys[i]);
736: sensitive_data.keys[i] = NULL;
737: }
738: }
739: xfree(sensitive_data.keys);
740: }
1.31 markus 741:
1.45 markus 742: exit_status = compat20 ? ssh_session2() : ssh_session();
743: packet_close();
744: return exit_status;
745: }
746:
1.126 itojun 747: static void
1.50 markus 748: x11_get_proto(char *proto, int proto_len, char *data, int data_len)
749: {
750: char line[512];
751: FILE *f;
752: int got_data = 0, i;
753:
1.55 markus 754: if (options.xauth_location) {
755: /* Try to get Xauthority information for the display. */
1.93 itojun 756: snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL,
1.55 markus 757: options.xauth_location, getenv("DISPLAY"));
758: f = popen(line, "r");
759: if (f && fgets(line, sizeof(line), f) &&
760: sscanf(line, "%*s %s %s", proto, data) == 2)
761: got_data = 1;
762: if (f)
763: pclose(f);
764: }
1.50 markus 765: /*
766: * If we didn't get authentication data, just make up some
767: * data. The forwarding code will check the validity of the
768: * response anyway, and substitute this data. The X11
769: * server, however, will ignore this fake data and use
770: * whatever authentication mechanisms it was using otherwise
771: * for the local connection.
772: */
773: if (!got_data) {
774: u_int32_t rand = 0;
775:
776: strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len);
777: for (i = 0; i < 16; i++) {
778: if (i % 4 == 0)
779: rand = arc4random();
780: snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff);
781: rand >>= 8;
782: }
783: }
784: }
785:
1.126 itojun 786: static void
1.70 markus 787: ssh_init_forwarding(void)
788: {
1.86 markus 789: int success = 0;
1.70 markus 790: int i;
1.86 markus 791:
1.70 markus 792: /* Initiate local TCP/IP port forwardings. */
793: for (i = 0; i < options.num_local_forwards; i++) {
794: debug("Connections to local port %d forwarded to remote address %.200s:%d",
795: options.local_forwards[i].port,
796: options.local_forwards[i].host,
797: options.local_forwards[i].host_port);
1.86 markus 798: success += channel_request_local_forwarding(
1.70 markus 799: options.local_forwards[i].port,
800: options.local_forwards[i].host,
801: options.local_forwards[i].host_port,
802: options.gateway_ports);
803: }
1.86 markus 804: if (i > 0 && success == 0)
805: error("Could not request local forwarding.");
1.70 markus 806:
807: /* Initiate remote TCP/IP port forwardings. */
808: for (i = 0; i < options.num_remote_forwards; i++) {
809: debug("Connections to remote port %d forwarded to local address %.200s:%d",
810: options.remote_forwards[i].port,
811: options.remote_forwards[i].host,
812: options.remote_forwards[i].host_port);
813: channel_request_remote_forwarding(
814: options.remote_forwards[i].port,
815: options.remote_forwards[i].host,
816: options.remote_forwards[i].host_port);
817: }
818: }
819:
1.126 itojun 820: static void
1.70 markus 821: check_agent_present(void)
822: {
823: if (options.forward_agent) {
824: /* Clear agent forwarding if we don\'t have an agent. */
825: int authfd = ssh_get_authentication_socket();
826: if (authfd < 0)
827: options.forward_agent = 0;
828: else
829: ssh_close_authentication_socket(authfd);
830: }
831: }
832:
1.126 itojun 833: static int
1.45 markus 834: ssh_session(void)
835: {
836: int type;
837: int plen;
838: int interactive = 0;
839: int have_tty = 0;
840: struct winsize ws;
841: char *cp;
842:
1.31 markus 843: /* Enable compression if requested. */
844: if (options.compression) {
845: debug("Requesting compression at level %d.", options.compression_level);
846:
847: if (options.compression_level < 1 || options.compression_level > 9)
848: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
849:
850: /* Send the request. */
851: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
852: packet_put_int(options.compression_level);
853: packet_send();
854: packet_write_wait();
855: type = packet_read(&plen);
856: if (type == SSH_SMSG_SUCCESS)
857: packet_start_compression(options.compression_level);
858: else if (type == SSH_SMSG_FAILURE)
859: log("Warning: Remote host refused compression.");
860: else
861: packet_disconnect("Protocol error waiting for compression response.");
862: }
863: /* Allocate a pseudo tty if appropriate. */
864: if (tty_flag) {
865: debug("Requesting pty.");
866:
867: /* Start the packet. */
868: packet_start(SSH_CMSG_REQUEST_PTY);
869:
870: /* Store TERM in the packet. There is no limit on the
871: length of the string. */
872: cp = getenv("TERM");
873: if (!cp)
874: cp = "";
1.124 markus 875: packet_put_cstring(cp);
1.31 markus 876:
877: /* Store window size in the packet. */
878: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
879: memset(&ws, 0, sizeof(ws));
880: packet_put_int(ws.ws_row);
881: packet_put_int(ws.ws_col);
882: packet_put_int(ws.ws_xpixel);
883: packet_put_int(ws.ws_ypixel);
884:
885: /* Store tty modes in the packet. */
1.115 stevesk 886: tty_make_modes(fileno(stdin), NULL);
1.31 markus 887:
888: /* Send the packet, and wait for it to leave. */
889: packet_send();
890: packet_write_wait();
891:
892: /* Read response from the server. */
893: type = packet_read(&plen);
1.43 markus 894: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 895: interactive = 1;
1.45 markus 896: have_tty = 1;
1.43 markus 897: } else if (type == SSH_SMSG_FAILURE)
1.31 markus 898: log("Warning: Remote host failed or refused to allocate a pseudo tty.");
899: else
900: packet_disconnect("Protocol error waiting for pty request response.");
901: }
902: /* Request X11 forwarding if enabled and DISPLAY is set. */
903: if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1.50 markus 904: char proto[512], data[512];
905: /* Get reasonable local authentication information. */
906: x11_get_proto(proto, sizeof proto, data, sizeof data);
907: /* Request forwarding with authentication spoofing. */
1.31 markus 908: debug("Requesting X11 forwarding with authentication spoofing.");
1.50 markus 909: x11_request_forwarding_with_spoofing(0, proto, data);
1.31 markus 910:
911: /* Read response from the server. */
912: type = packet_read(&plen);
913: if (type == SSH_SMSG_SUCCESS) {
914: interactive = 1;
1.50 markus 915: } else if (type == SSH_SMSG_FAILURE) {
1.31 markus 916: log("Warning: Remote host denied X11 forwarding.");
1.50 markus 917: } else {
1.31 markus 918: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 919: }
1.31 markus 920: }
921: /* Tell the packet module whether this is an interactive session. */
1.80 markus 922: packet_set_interactive(interactive);
1.31 markus 923:
924: /* Request authentication agent forwarding if appropriate. */
1.70 markus 925: check_agent_present();
926:
1.31 markus 927: if (options.forward_agent) {
928: debug("Requesting authentication agent forwarding.");
929: auth_request_forwarding();
930:
931: /* Read response from the server. */
932: type = packet_read(&plen);
933: packet_integrity_check(plen, 0, type);
934: if (type != SSH_SMSG_SUCCESS)
935: log("Warning: Remote host denied authentication agent forwarding.");
936: }
937:
1.70 markus 938: /* Initiate port forwardings. */
939: ssh_init_forwarding();
1.34 markus 940:
941: /* If requested, let ssh continue in the background. */
1.48 markus 942: if (fork_after_authentication_flag)
1.34 markus 943: if (daemon(1, 1) < 0)
944: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 945:
1.33 markus 946: /*
947: * If a command was specified on the command line, execute the
948: * command now. Otherwise request the server to start a shell.
949: */
1.31 markus 950: if (buffer_len(&command) > 0) {
951: int len = buffer_len(&command);
952: if (len > 900)
953: len = 900;
954: debug("Sending command: %.*s", len, buffer_ptr(&command));
955: packet_start(SSH_CMSG_EXEC_CMD);
956: packet_put_string(buffer_ptr(&command), buffer_len(&command));
957: packet_send();
958: packet_write_wait();
959: } else {
960: debug("Requesting shell.");
961: packet_start(SSH_CMSG_EXEC_SHELL);
962: packet_send();
963: packet_write_wait();
964: }
965:
966: /* Enter the interactive session. */
1.119 stevesk 967: return client_loop(have_tty, tty_flag ?
968: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 969: }
970:
1.126 itojun 971: static void
1.89 markus 972: client_subsystem_reply(int type, int plen, void *ctxt)
973: {
974: int id, len;
975:
976: id = packet_get_int();
977: len = buffer_len(&command);
1.100 markus 978: if (len > 900)
979: len = 900;
1.89 markus 980: packet_done();
981: if (type == SSH2_MSG_CHANNEL_FAILURE)
982: fatal("Request for subsystem '%.*s' failed on channel %d",
983: len, buffer_ptr(&command), id);
984: }
985:
1.126 itojun 986: static void
1.70 markus 987: ssh_session2_callback(int id, void *arg)
1.45 markus 988: {
989: int len;
1.80 markus 990: int interactive = 0;
1.115 stevesk 991: struct termios tio;
1.80 markus 992:
1.87 deraadt 993: debug("client_init id %d arg %ld", id, (long)arg);
1.31 markus 994:
1.45 markus 995: if (tty_flag) {
996: struct winsize ws;
997: char *cp;
998: cp = getenv("TERM");
999: if (!cp)
1000: cp = "";
1001: /* Store window size in the packet. */
1002: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1003: memset(&ws, 0, sizeof(ws));
1004:
1005: channel_request_start(id, "pty-req", 0);
1006: packet_put_cstring(cp);
1007: packet_put_int(ws.ws_col);
1008: packet_put_int(ws.ws_row);
1009: packet_put_int(ws.ws_xpixel);
1010: packet_put_int(ws.ws_ypixel);
1.115 stevesk 1011: tio = get_saved_tio();
1012: tty_make_modes(/*ignored*/ 0, &tio);
1.45 markus 1013: packet_send();
1.80 markus 1014: interactive = 1;
1.45 markus 1015: /* XXX wait for reply */
1016: }
1.50 markus 1017: if (options.forward_x11 &&
1018: getenv("DISPLAY") != NULL) {
1019: char proto[512], data[512];
1020: /* Get reasonable local authentication information. */
1021: x11_get_proto(proto, sizeof proto, data, sizeof data);
1022: /* Request forwarding with authentication spoofing. */
1023: debug("Requesting X11 forwarding with authentication spoofing.");
1024: x11_request_forwarding_with_spoofing(id, proto, data);
1.80 markus 1025: interactive = 1;
1.50 markus 1026: /* XXX wait for reply */
1027: }
1028:
1.70 markus 1029: check_agent_present();
1030: if (options.forward_agent) {
1031: debug("Requesting authentication agent forwarding.");
1032: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1033: packet_send();
1034: }
1035:
1.45 markus 1036: len = buffer_len(&command);
1037: if (len > 0) {
1038: if (len > 900)
1039: len = 900;
1.85 djm 1040: if (subsystem_flag) {
1041: debug("Sending subsystem: %.*s", len, buffer_ptr(&command));
1.89 markus 1042: channel_request_start(id, "subsystem", /*want reply*/ 1);
1043: /* register callback for reply */
1044: /* XXX we asume that client_loop has already been called */
1045: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1046: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
1.85 djm 1047: } else {
1048: debug("Sending command: %.*s", len, buffer_ptr(&command));
1049: channel_request_start(id, "exec", 0);
1050: }
1.100 markus 1051: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1.45 markus 1052: packet_send();
1053: } else {
1054: channel_request(id, "shell", 0);
1055: }
1056: /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */
1.90 markus 1057:
1.45 markus 1058: /* register different callback, etc. XXX */
1.80 markus 1059: packet_set_interactive(interactive);
1.45 markus 1060: }
1061:
1.126 itojun 1062: static int
1.106 markus 1063: ssh_session2_command(void)
1.45 markus 1064: {
1.118 markus 1065: Channel *c;
1066: int window, packetmax, in, out, err;
1.60 markus 1067:
1.62 markus 1068: if (stdin_null_flag) {
1.93 itojun 1069: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1070: } else {
1071: in = dup(STDIN_FILENO);
1072: }
1.60 markus 1073: out = dup(STDOUT_FILENO);
1074: err = dup(STDERR_FILENO);
1.45 markus 1075:
1076: if (in < 0 || out < 0 || err < 0)
1.62 markus 1077: fatal("dup() in/out/err failed");
1.45 markus 1078:
1.69 markus 1079: /* enable nonblocking unless tty */
1080: if (!isatty(in))
1081: set_nonblock(in);
1082: if (!isatty(out))
1083: set_nonblock(out);
1084: if (!isatty(err))
1085: set_nonblock(err);
1086:
1.65 markus 1087: window = CHAN_SES_WINDOW_DEFAULT;
1088: packetmax = CHAN_SES_PACKET_DEFAULT;
1089: if (!tty_flag) {
1.45 markus 1090: window *= 2;
1.65 markus 1091: packetmax *=2;
1.45 markus 1092: }
1.118 markus 1093: c = channel_new(
1.45 markus 1094: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1095: window, packetmax, CHAN_EXTENDED_WRITE,
1.69 markus 1096: xstrdup("client-session"), /*nonblock*/0);
1.118 markus 1097: if (c == NULL)
1098: fatal("ssh_session2_command: channel_new failed");
1.45 markus 1099:
1.118 markus 1100: debug3("ssh_session2_command: channel_new: %d", c->self);
1.106 markus 1101:
1.122 markus 1102: channel_send_open(c->self);
1.118 markus 1103: channel_register_callback(c->self, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
1.70 markus 1104: ssh_session2_callback, (void *)0);
1.106 markus 1105:
1.118 markus 1106: return c->self;
1.106 markus 1107: }
1108:
1.126 itojun 1109: static int
1.106 markus 1110: ssh_session2(void)
1111: {
1112: int id;
1113:
1114: /* XXX should be pre-session */
1115: ssh_init_forwarding();
1116:
1117: id = no_shell_flag ? -1 : ssh_session2_command();
1118:
1119: /* If requested, let ssh continue in the background. */
1120: if (fork_after_authentication_flag)
1121: if (daemon(1, 1) < 0)
1122: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1123:
1.119 stevesk 1124: return client_loop(tty_flag, tty_flag ?
1125: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1126: }
1127:
1.126 itojun 1128: static void
1.104 markus 1129: load_public_identity_files(void)
1130: {
1131: char *filename;
1132: Key *public;
1133: int i;
1134:
1135: for (i = 0; i < options.num_identity_files; i++) {
1136: filename = tilde_expand_filename(options.identity_files[i],
1137: original_real_uid);
1.105 markus 1138: public = key_load_public(filename, NULL);
1.104 markus 1139: debug("identity file %s type %d", filename,
1140: public ? public->type : -1);
1141: xfree(options.identity_files[i]);
1142: options.identity_files[i] = filename;
1143: options.identity_keys[i] = public;
1144: }
1.127 markus 1145: #ifdef SMARTCARD
1146: if (sc_reader_num != -1 &&
1147: options.num_identity_files + 1 < SSH_MAX_IDENTITY_FILES &&
1148: (public = sc_get_key(sc_reader_num)) != NULL ) {
1149: Key *new;
1150:
1151: /* XXX ssh1 vs ssh2 */
1152: new = key_new(KEY_RSA);
1153: new->flags = KEY_FLAG_EXT;
1154: BN_copy(new->rsa->n, public->rsa->n);
1155: BN_copy(new->rsa->e, public->rsa->e);
1156: RSA_set_method(new->rsa, sc_get_engine());
1157: i = options.num_identity_files++;
1158: options.identity_keys[i] = new;
1159: options.identity_files[i] = xstrdup("smartcard rsa key");;
1160:
1161: new = key_new(KEY_RSA1);
1162: new->flags = KEY_FLAG_EXT;
1163: BN_copy(new->rsa->n, public->rsa->n);
1164: BN_copy(new->rsa->e, public->rsa->e);
1165: RSA_set_method(new->rsa, sc_get_engine());
1166: i = options.num_identity_files++;
1167: options.identity_keys[i] = new;
1168: options.identity_files[i] = xstrdup("smartcard rsa1 key");;
1169:
1170: key_free(public);
1171: }
1172: #endif
1.1 deraadt 1173: }
![[BACK]](/icons/back.gif){kind=icon}
Return to ssh.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh