Annotation of src/usr.bin/ssh/ssh.c, Revision 1.335
1.335 ! djm 1: /* $OpenBSD: ssh.c,v 1.334 2010/02/08 22:03:05 jmc Exp $ */
1.1 deraadt 2: /*
1.32 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * Ssh client program. This program can be used to log into a remote machine.
7: * The software supports strong authentication, encryption, and forwarding
8: * of X11, TCP/IP, and authentication connections.
9: *
1.64 deraadt 10: * As far as I am concerned, the code I have written for this software
11: * can be used freely for any purpose. Any derived versions of this
12: * software must be clearly marked as such, and if the derived work is
13: * incompatible with the protocol description in the RFC file, it must be
14: * called by a name other than "ssh" or "Secure Shell".
15: *
16: * Copyright (c) 1999 Niels Provos. All rights reserved.
1.202 markus 17: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 18: *
19: * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20: * in Canada (German citizen).
21: *
22: * Redistribution and use in source and binary forms, with or without
23: * modification, are permitted provided that the following conditions
24: * are met:
25: * 1. Redistributions of source code must retain the above copyright
26: * notice, this list of conditions and the following disclaimer.
27: * 2. Redistributions in binary form must reproduce the above copyright
28: * notice, this list of conditions and the following disclaimer in the
29: * documentation and/or other materials provided with the distribution.
30: *
31: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 41: */
1.1 deraadt 42:
1.293 deraadt 43: #include <sys/types.h>
1.312 djm 44: #include <sys/ioctl.h>
1.326 dtucker 45: #include <sys/param.h>
1.312 djm 46: #include <sys/queue.h>
1.259 stevesk 47: #include <sys/resource.h>
1.280 stevesk 48: #include <sys/socket.h>
1.264 stevesk 49: #include <sys/stat.h>
1.312 djm 50: #include <sys/types.h>
51: #include <sys/time.h>
1.258 stevesk 52:
1.265 stevesk 53: #include <ctype.h>
1.285 stevesk 54: #include <errno.h>
1.281 stevesk 55: #include <fcntl.h>
1.286 stevesk 56: #include <netdb.h>
1.258 stevesk 57: #include <paths.h>
1.279 stevesk 58: #include <pwd.h>
1.263 stevesk 59: #include <signal.h>
1.287 stevesk 60: #include <stddef.h>
1.291 stevesk 61: #include <stdio.h>
1.290 stevesk 62: #include <stdlib.h>
1.289 stevesk 63: #include <string.h>
1.288 stevesk 64: #include <unistd.h>
1.49 markus 65:
66: #include <openssl/evp.h>
1.72 markus 67: #include <openssl/err.h>
1.1 deraadt 68:
1.293 deraadt 69: #include "xmalloc.h"
1.84 markus 70: #include "ssh.h"
71: #include "ssh1.h"
72: #include "ssh2.h"
73: #include "compat.h"
74: #include "cipher.h"
1.1 deraadt 75: #include "packet.h"
76: #include "buffer.h"
1.123 markus 77: #include "channels.h"
1.49 markus 78: #include "key.h"
1.58 markus 79: #include "authfd.h"
1.49 markus 80: #include "authfile.h"
1.83 markus 81: #include "pathnames.h"
1.214 djm 82: #include "dispatch.h"
1.81 markus 83: #include "clientloop.h"
1.84 markus 84: #include "log.h"
85: #include "readconf.h"
86: #include "sshconnect.h"
87: #include "misc.h"
1.95 markus 88: #include "kex.h"
89: #include "mac.h"
1.213 deraadt 90: #include "sshpty.h"
1.212 djm 91: #include "match.h"
1.214 djm 92: #include "msg.h"
1.225 dtucker 93: #include "uidswap.h"
1.327 andreas 94: #include "roaming.h"
1.278 stevesk 95: #include "version.h"
1.49 markus 96:
1.333 markus 97: #ifdef ENABLE_PKCS11
98: #include "ssh-pkcs11.h"
1.137 jakob 99: #endif
1.127 markus 100:
1.49 markus 101: extern char *__progname;
1.1 deraadt 102:
1.316 djm 103: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 104: int debug_flag = 0;
105:
1.46 markus 106: /* Flag indicating whether a tty should be allocated */
1.1 deraadt 107: int tty_flag = 0;
1.79 markus 108: int no_tty_flag = 0;
109: int force_tty_flag = 0;
1.1 deraadt 110:
1.45 markus 111: /* don't exec a shell */
112: int no_shell_flag = 0;
113:
1.33 markus 114: /*
115: * Flag indicating that nothing should be read from stdin. This can be set
116: * on the command line.
117: */
1.1 deraadt 118: int stdin_null_flag = 0;
119:
1.33 markus 120: /*
121: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 122: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 123: * background.
124: */
1.1 deraadt 125: int fork_after_authentication_flag = 0;
126:
1.331 dtucker 127: /* forward stdio to remote host and port */
128: char *stdio_forward_host = NULL;
129: int stdio_forward_port = 0;
130:
1.33 markus 131: /*
132: * General data structure for command line options and options configurable
133: * in configuration files. See readconf.h.
134: */
1.1 deraadt 135: Options options;
136:
1.139 markus 137: /* optional user configfile */
138: char *config = NULL;
139:
1.33 markus 140: /*
141: * Name of the host we are connecting to. This is the name given on the
142: * command line, or the HostName specified for the user-supplied name in a
143: * configuration file.
144: */
1.1 deraadt 145: char *host;
146:
1.22 provos 147: /* socket address the host resolves to */
1.37 markus 148: struct sockaddr_storage hostaddr;
1.1 deraadt 149:
1.112 markus 150: /* Private host keys. */
1.173 markus 151: Sensitive sensitive_data;
1.1 deraadt 152:
1.10 dugsong 153: /* Original real UID. */
154: uid_t original_real_uid;
1.177 markus 155: uid_t original_effective_uid;
1.1 deraadt 156:
1.45 markus 157: /* command to be executed */
158: Buffer command;
159:
1.85 djm 160: /* Should we execute a command or invoke a subsystem? */
161: int subsystem_flag = 0;
162:
1.170 markus 163: /* # of replies received for global requests */
1.315 djm 164: static int remote_forward_confirms_received = 0;
1.170 markus 165:
1.186 djm 166: /* pid of proxycommand child process */
167: pid_t proxy_command_pid = 0;
1.313 djm 168:
169: /* mux.c */
170: extern int muxserver_sock;
171: extern u_int muxclient_command;
172:
1.186 djm 173:
1.1 deraadt 174: /* Prints a help message to the user. This function never returns. */
175:
1.126 itojun 176: static void
1.93 itojun 177: usage(void)
1.1 deraadt 178: {
1.208 markus 179: fprintf(stderr,
1.321 jmc 180: "usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
1.251 jmc 181: " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
1.334 jmc 182: " [-I pkcs11] [-i identity_file]\n"
183: " [-L [bind_address:]port:host:hostport]\n"
1.232 djm 184: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
1.233 jmc 185: " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
1.331 dtucker 186: " [-W host:port] [-w local_tun[:remote_tun]]\n"
187: " [user@]hostname [command]\n"
1.208 markus 188: );
1.257 dtucker 189: exit(255);
1.1 deraadt 190: }
191:
1.126 itojun 192: static int ssh_session(void);
193: static int ssh_session2(void);
194: static void load_public_identity_files(void);
1.312 djm 195:
196: /* from muxclient.c */
197: void muxclient(const char *);
198: void muxserver_listen(void);
1.45 markus 199:
1.32 deraadt 200: /*
201: * Main program for the ssh client.
202: */
1.2 provos 203: int
204: main(int ac, char **av)
1.1 deraadt 205: {
1.326 dtucker 206: int i, r, opt, exit_status, use_syslog;
207: char *p, *cp, *line, *argv0, buf[MAXPATHLEN];
1.31 markus 208: struct stat st;
1.98 markus 209: struct passwd *pw;
1.303 djm 210: int dummy, timeout_ms;
1.144 stevesk 211: extern int optind, optreset;
212: extern char *optarg;
1.244 djm 213: struct servent *sp;
1.232 djm 214: Forward fwd;
1.250 djm 215:
216: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
217: sanitise_stdfd();
1.31 markus 218:
1.33 markus 219: /*
220: * Save the original real uid. It will be needed later (uid-swapping
221: * may clobber the real uid).
222: */
1.31 markus 223: original_real_uid = getuid();
224: original_effective_uid = geteuid();
225:
1.184 stevesk 226: /*
227: * Use uid-swapping to give up root privileges for the duration of
228: * option processing. We will re-instantiate the rights when we are
229: * ready to create the privileged port, and will permanently drop
230: * them when the port has been created (actually, when the connection
231: * has been made, as we may need to create the port several times).
232: */
233: PRIV_END;
234:
1.31 markus 235: /* If we are installed setuid root be careful to not drop core. */
236: if (original_real_uid != original_effective_uid) {
237: struct rlimit rlim;
238: rlim.rlim_cur = rlim.rlim_max = 0;
239: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
240: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 241: }
1.107 markus 242: /* Get user data. */
243: pw = getpwuid(original_real_uid);
244: if (!pw) {
1.191 itojun 245: logit("You don't exist, go away!");
1.257 dtucker 246: exit(255);
1.107 markus 247: }
248: /* Take a copy of the returned structure. */
249: pw = pwcopy(pw);
1.31 markus 250:
1.33 markus 251: /*
252: * Set our umask to something reasonable, as some files are created
253: * with the default umask. This will make them world-readable but
254: * writable only by the owner, which is ok for all files for which we
255: * don't set the modes explicitly.
256: */
1.31 markus 257: umask(022);
258:
1.316 djm 259: /*
260: * Initialize option structure to indicate that no values have been
261: * set.
262: */
1.31 markus 263: initialize_options(&options);
264:
265: /* Parse command-line arguments. */
266: host = NULL;
1.320 djm 267: use_syslog = 0;
1.325 markus 268: argv0 = av[0];
1.31 markus 269:
1.266 djm 270: again:
1.316 djm 271: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.331 dtucker 272: "ACD:F:I:KL:MNO:PR:S:TVw:W:XYy")) != -1) {
1.31 markus 273: switch (opt) {
1.91 jakob 274: case '1':
275: options.protocol = SSH_PROTO_1;
276: break;
1.47 markus 277: case '2':
278: options.protocol = SSH_PROTO_2;
279: break;
1.37 markus 280: case '4':
1.196 djm 281: options.address_family = AF_INET;
1.37 markus 282: break;
283: case '6':
1.196 djm 284: options.address_family = AF_INET6;
1.37 markus 285: break;
1.31 markus 286: case 'n':
287: stdin_null_flag = 1;
288: break;
289: case 'f':
290: fork_after_authentication_flag = 1;
291: stdin_null_flag = 1;
292: break;
293: case 'x':
294: options.forward_x11 = 0;
295: break;
296: case 'X':
297: options.forward_x11 = 1;
298: break;
1.320 djm 299: case 'y':
300: use_syslog = 1;
301: break;
1.202 markus 302: case 'Y':
303: options.forward_x11 = 1;
304: options.forward_x11_trusted = 1;
305: break;
1.31 markus 306: case 'g':
307: options.gateway_ports = 1;
308: break;
1.229 djm 309: case 'O':
1.332 djm 310: if (stdio_forward_host != NULL)
311: fatal("Cannot specify multiplexing "
312: "command with -W");
313: else if (muxclient_command != 0)
314: fatal("Multiplexing command already specified");
1.229 djm 315: if (strcmp(optarg, "check") == 0)
1.312 djm 316: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.229 djm 317: else if (strcmp(optarg, "exit") == 0)
1.312 djm 318: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.229 djm 319: else
320: fatal("Invalid multiplex command.");
321: break;
1.183 stevesk 322: case 'P': /* deprecated */
1.31 markus 323: options.use_privileged_port = 0;
324: break;
325: case 'a':
326: options.forward_agent = 0;
1.53 markus 327: break;
328: case 'A':
329: options.forward_agent = 1;
1.31 markus 330: break;
331: case 'k':
1.204 dtucker 332: options.gss_deleg_creds = 0;
1.297 djm 333: break;
334: case 'K':
335: options.gss_authentication = 1;
336: options.gss_deleg_creds = 1;
1.31 markus 337: break;
338: case 'i':
339: if (stat(optarg, &st) < 0) {
1.128 fgsch 340: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 341: "not accessible: %s.\n", optarg,
342: strerror(errno));
1.31 markus 343: break;
344: }
1.128 fgsch 345: if (options.num_identity_files >=
346: SSH_MAX_IDENTITY_FILES)
347: fatal("Too many identity files specified "
348: "(max %d)", SSH_MAX_IDENTITY_FILES);
349: options.identity_files[options.num_identity_files++] =
350: xstrdup(optarg);
1.31 markus 351: break;
1.127 markus 352: case 'I':
1.333 markus 353: #ifdef ENABLE_PKCS11
354: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 355: #else
1.333 markus 356: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 357: #endif
1.127 markus 358: break;
1.31 markus 359: case 't':
1.79 markus 360: if (tty_flag)
361: force_tty_flag = 1;
1.31 markus 362: tty_flag = 1;
363: break;
364: case 'v':
1.197 markus 365: if (debug_flag == 0) {
1.66 markus 366: debug_flag = 1;
367: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 368: } else {
369: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
370: options.log_level++;
1.66 markus 371: break;
1.197 markus 372: }
1.227 deraadt 373: /* FALLTHROUGH */
1.31 markus 374: case 'V':
1.209 markus 375: fprintf(stderr, "%s, %s\n",
376: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 377: if (opt == 'V')
378: exit(0);
379: break;
1.255 reyk 380: case 'w':
1.256 reyk 381: if (options.tun_open == -1)
382: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 383: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 384: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 385: fprintf(stderr,
386: "Bad tun device '%s'\n", optarg);
1.257 dtucker 387: exit(255);
1.255 reyk 388: }
389: break;
1.331 dtucker 390: case 'W':
1.332 djm 391: if (stdio_forward_host != NULL)
392: fatal("stdio forward already specified");
393: if (muxclient_command != 0)
394: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 395: if (parse_forward(&fwd, optarg, 1, 0)) {
396: stdio_forward_host = fwd.listen_host;
397: stdio_forward_port = fwd.listen_port;
398: xfree(fwd.connect_host);
399: } else {
400: fprintf(stderr,
401: "Bad stdio forwarding specification '%s'\n",
402: optarg);
403: exit(255);
404: }
405: no_tty_flag = 1;
406: no_shell_flag = 1;
407: options.clear_forwardings = 1;
408: options.exit_on_forward_failure = 1;
409: break;
1.31 markus 410: case 'q':
411: options.log_level = SYSLOG_LEVEL_QUIET;
412: break;
413: case 'e':
414: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 415: (u_char) optarg[1] >= 64 &&
416: (u_char) optarg[1] < 128)
1.78 markus 417: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 418: else if (strlen(optarg) == 1)
1.78 markus 419: options.escape_char = (u_char) optarg[0];
1.31 markus 420: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 421: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 422: else {
1.128 fgsch 423: fprintf(stderr, "Bad escape character '%s'.\n",
424: optarg);
1.257 dtucker 425: exit(255);
1.31 markus 426: }
427: break;
428: case 'c':
1.49 markus 429: if (ciphers_valid(optarg)) {
430: /* SSH2 only */
431: options.ciphers = xstrdup(optarg);
1.224 markus 432: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 433: } else {
434: /* SSH1 only */
1.74 markus 435: options.cipher = cipher_number(optarg);
436: if (options.cipher == -1) {
1.128 fgsch 437: fprintf(stderr,
438: "Unknown cipher type '%s'\n",
439: optarg);
1.257 dtucker 440: exit(255);
1.49 markus 441: }
1.128 fgsch 442: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 443: options.ciphers = "3des-cbc";
1.128 fgsch 444: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 445: options.ciphers = "blowfish-cbc";
1.128 fgsch 446: else
1.74 markus 447: options.ciphers = (char *)-1;
1.95 markus 448: }
449: break;
450: case 'm':
451: if (mac_valid(optarg))
452: options.macs = xstrdup(optarg);
453: else {
1.128 fgsch 454: fprintf(stderr, "Unknown mac type '%s'\n",
455: optarg);
1.257 dtucker 456: exit(255);
1.31 markus 457: }
458: break;
1.214 djm 459: case 'M':
1.242 djm 460: if (options.control_master == SSHCTL_MASTER_YES)
461: options.control_master = SSHCTL_MASTER_ASK;
462: else
463: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 464: break;
1.31 markus 465: case 'p':
1.113 stevesk 466: options.port = a2port(optarg);
1.323 djm 467: if (options.port <= 0) {
1.109 markus 468: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 469: exit(255);
1.109 markus 470: }
1.31 markus 471: break;
472: case 'l':
473: options.user = optarg;
474: break;
1.141 stevesk 475:
476: case 'L':
1.324 djm 477: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 478: add_local_forward(&options, &fwd);
479: else {
1.128 fgsch 480: fprintf(stderr,
1.232 djm 481: "Bad local forwarding specification '%s'\n",
1.128 fgsch 482: optarg);
1.257 dtucker 483: exit(255);
1.31 markus 484: }
1.232 djm 485: break;
486:
487: case 'R':
1.324 djm 488: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 489: add_remote_forward(&options, &fwd);
490: } else {
1.128 fgsch 491: fprintf(stderr,
1.232 djm 492: "Bad remote forwarding specification "
493: "'%s'\n", optarg);
1.257 dtucker 494: exit(255);
1.31 markus 495: }
496: break;
1.108 markus 497:
498: case 'D':
1.324 djm 499: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 500: add_local_forward(&options, &fwd);
1.232 djm 501: } else {
1.322 stevesk 502: fprintf(stderr,
503: "Bad dynamic forwarding specification "
504: "'%s'\n", optarg);
1.257 dtucker 505: exit(255);
1.109 markus 506: }
1.108 markus 507: break;
508:
1.31 markus 509: case 'C':
510: options.compression = 1;
511: break;
1.45 markus 512: case 'N':
513: no_shell_flag = 1;
514: no_tty_flag = 1;
515: break;
516: case 'T':
517: no_tty_flag = 1;
518: break;
1.31 markus 519: case 'o':
520: dummy = 1;
1.205 markus 521: line = xstrdup(optarg);
1.128 fgsch 522: if (process_config_line(&options, host ? host : "",
1.205 markus 523: line, "command-line", 0, &dummy) != 0)
1.257 dtucker 524: exit(255);
1.205 markus 525: xfree(line);
1.31 markus 526: break;
1.85 djm 527: case 's':
528: subsystem_flag = 1;
1.117 markus 529: break;
1.214 djm 530: case 'S':
531: if (options.control_path != NULL)
532: free(options.control_path);
533: options.control_path = xstrdup(optarg);
534: break;
1.117 markus 535: case 'b':
536: options.bind_address = optarg;
1.85 djm 537: break;
1.139 markus 538: case 'F':
539: config = optarg;
540: break;
1.31 markus 541: default:
542: usage();
1.1 deraadt 543: }
1.31 markus 544: }
545:
1.128 fgsch 546: ac -= optind;
547: av += optind;
548:
1.329 guenther 549: if (ac > 0 && !host) {
1.188 markus 550: if (strrchr(*av, '@')) {
1.128 fgsch 551: p = xstrdup(*av);
1.188 markus 552: cp = strrchr(p, '@');
1.128 fgsch 553: if (cp == NULL || cp == p)
554: usage();
555: options.user = p;
556: *cp = '\0';
557: host = ++cp;
558: } else
559: host = *av;
1.189 millert 560: if (ac > 1) {
561: optind = optreset = 1;
1.128 fgsch 562: goto again;
563: }
1.189 millert 564: ac--, av++;
1.128 fgsch 565: }
566:
1.31 markus 567: /* Check that we got a host name. */
568: if (!host)
569: usage();
570:
1.54 markus 571: SSLeay_add_all_algorithms();
1.72 markus 572: ERR_load_crypto_strings();
1.31 markus 573:
574: /* Initialize the command to execute on remote host. */
575: buffer_init(&command);
1.1 deraadt 576:
1.33 markus 577: /*
578: * Save the command to execute on the remote host in a buffer. There
579: * is no limit on the length of the command, except by the maximum
580: * packet size. Also sets the tty flag if there is no command.
581: */
1.128 fgsch 582: if (!ac) {
1.31 markus 583: /* No command specified - execute shell on a tty. */
584: tty_flag = 1;
1.85 djm 585: if (subsystem_flag) {
1.128 fgsch 586: fprintf(stderr,
587: "You must specify a subsystem to invoke.\n");
1.85 djm 588: usage();
589: }
1.31 markus 590: } else {
1.128 fgsch 591: /* A command has been specified. Store it into the buffer. */
592: for (i = 0; i < ac; i++) {
593: if (i)
1.31 markus 594: buffer_append(&command, " ", 1);
595: buffer_append(&command, av[i], strlen(av[i]));
596: }
597: }
598:
599: /* Cannot fork to background if no command. */
1.316 djm 600: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
601: !no_shell_flag)
602: fatal("Cannot fork into background without a command "
603: "to execute.");
1.31 markus 604:
605: /* Allocate a tty by default if no command specified. */
606: if (buffer_len(&command) == 0)
607: tty_flag = 1;
608:
1.180 deraadt 609: /* Force no tty */
1.75 markus 610: if (no_tty_flag)
611: tty_flag = 0;
1.31 markus 612: /* Do not allocate a tty if stdin is not a tty. */
1.236 djm 613: if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
1.31 markus 614: if (tty_flag)
1.316 djm 615: logit("Pseudo-terminal will not be allocated because "
616: "stdin is not a terminal.");
1.31 markus 617: tty_flag = 0;
618: }
1.45 markus 619:
1.101 markus 620: /*
621: * Initialize "log" output. Since we are the client all output
622: * actually goes to stderr.
623: */
1.325 markus 624: log_init(argv0,
1.316 djm 625: options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
1.320 djm 626: SYSLOG_FACILITY_USER, !use_syslog);
1.31 markus 627:
1.139 markus 628: /*
629: * Read per-user configuration file. Ignore the system wide config
630: * file if the user specifies a config file on the command line.
631: */
632: if (config != NULL) {
1.211 djm 633: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 634: fatal("Can't open user config file %.100s: "
635: "%.100s", config, strerror(errno));
1.295 stevesk 636: } else {
1.326 dtucker 637: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
1.139 markus 638: _PATH_SSH_USER_CONFFILE);
1.326 dtucker 639: if (r > 0 && (size_t)r < sizeof(buf))
640: (void)read_config_file(buf, host, &options, 1);
1.139 markus 641:
1.145 markus 642: /* Read systemwide configuration file after use config. */
1.223 deraadt 643: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 644: &options, 0);
1.139 markus 645: }
1.31 markus 646:
647: /* Fill configuration defaults. */
648: fill_default_options(&options);
649:
1.196 djm 650: channel_set_af(options.address_family);
651:
1.31 markus 652: /* reinit */
1.325 markus 653: log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
1.31 markus 654:
655: if (options.user == NULL)
656: options.user = xstrdup(pw->pw_name);
657:
1.317 dtucker 658: /* Get default port if port has not been set. */
659: if (options.port == 0) {
660: sp = getservbyname(SSH_SERVICE_NAME, "tcp");
661: options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
662: }
663:
664: if (options.local_command != NULL) {
665: char thishost[NI_MAXHOST];
666:
667: if (gethostname(thishost, sizeof(thishost)) == -1)
668: fatal("gethostname: %s", strerror(errno));
669: snprintf(buf, sizeof(buf), "%d", options.port);
670: debug3("expanding LocalCommand: %s", options.local_command);
671: cp = options.local_command;
672: options.local_command = percent_expand(cp, "d", pw->pw_dir,
673: "h", options.hostname? options.hostname : host,
674: "l", thishost, "n", host, "r", options.user, "p", buf,
675: "u", pw->pw_name, (char *)NULL);
676: debug3("expanded LocalCommand: %s", options.local_command);
677: xfree(cp);
678: }
679:
1.31 markus 680: if (options.hostname != NULL)
681: host = options.hostname;
1.195 markus 682:
683: /* force lowercase for hostkey matching */
684: if (options.host_key_alias != NULL) {
685: for (p = options.host_key_alias; *p; p++)
686: if (isupper(*p))
1.271 deraadt 687: *p = (char)tolower(*p);
1.246 djm 688: }
689:
1.190 markus 690: if (options.proxy_command != NULL &&
1.304 dtucker 691: strcmp(options.proxy_command, "none") == 0) {
692: xfree(options.proxy_command);
1.190 markus 693: options.proxy_command = NULL;
1.304 dtucker 694: }
1.245 djm 695: if (options.control_path != NULL &&
1.304 dtucker 696: strcmp(options.control_path, "none") == 0) {
697: xfree(options.control_path);
1.245 djm 698: options.control_path = NULL;
1.304 dtucker 699: }
1.31 markus 700:
1.214 djm 701: if (options.control_path != NULL) {
1.275 djm 702: char thishost[NI_MAXHOST];
1.261 djm 703:
1.275 djm 704: if (gethostname(thishost, sizeof(thishost)) == -1)
1.261 djm 705: fatal("gethostname: %s", strerror(errno));
1.241 djm 706: snprintf(buf, sizeof(buf), "%d", options.port);
707: cp = tilde_expand_filename(options.control_path,
708: original_real_uid);
1.304 dtucker 709: xfree(options.control_path);
1.241 djm 710: options.control_path = percent_expand(cp, "p", buf, "h", host,
1.275 djm 711: "r", options.user, "l", thishost, (char *)NULL);
1.241 djm 712: xfree(cp);
1.214 djm 713: }
1.312 djm 714: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 715: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 716: if (options.control_path != NULL)
1.312 djm 717: muxclient(options.control_path);
1.214 djm 718:
1.303 djm 719: timeout_ms = options.connection_timeout * 1000;
720:
1.77 markus 721: /* Open a connection to the remote host. */
1.203 djm 722: if (ssh_connect(host, &hostaddr, options.port,
1.303 djm 723: options.address_family, options.connection_attempts, &timeout_ms,
724: options.tcp_keep_alive,
1.177 markus 725: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 726: options.proxy_command) != 0)
1.257 dtucker 727: exit(255);
1.31 markus 728:
1.303 djm 729: if (timeout_ms > 0)
730: debug3("timeout: %d ms remain after connect", timeout_ms);
731:
1.33 markus 732: /*
733: * If we successfully made the connection, load the host private key
734: * in case we will need it later for combined rsa-rhosts
735: * authentication. This must be done before releasing extra
736: * privileges, because the file is only readable by root.
1.174 markus 737: * If we cannot access the private keys, load the public keys
738: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 739: */
1.112 markus 740: sensitive_data.nkeys = 0;
741: sensitive_data.keys = NULL;
1.173 markus 742: sensitive_data.external_keysign = 0;
1.178 markus 743: if (options.rhosts_rsa_authentication ||
744: options.hostbased_authentication) {
1.112 markus 745: sensitive_data.nkeys = 3;
1.274 deraadt 746: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 747: sizeof(Key));
1.177 markus 748:
749: PRIV_START;
1.112 markus 750: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 751: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.112 markus 752: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
1.276 dtucker 753: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.112 markus 754: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
1.276 dtucker 755: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.177 markus 756: PRIV_END;
1.173 markus 757:
1.181 markus 758: if (options.hostbased_authentication == 1 &&
759: sensitive_data.keys[0] == NULL &&
1.173 markus 760: sensitive_data.keys[1] == NULL &&
761: sensitive_data.keys[2] == NULL) {
762: sensitive_data.keys[1] = key_load_public(
763: _PATH_HOST_DSA_KEY_FILE, NULL);
764: sensitive_data.keys[2] = key_load_public(
765: _PATH_HOST_RSA_KEY_FILE, NULL);
766: sensitive_data.external_keysign = 1;
767: }
1.31 markus 768: }
1.33 markus 769: /*
770: * Get rid of any extra privileges that we may have. We will no
771: * longer need them. Also, extra privileges could make it very hard
772: * to read identity files and other non-world-readable files from the
773: * user's home directory if it happens to be on a NFS volume where
774: * root is mapped to nobody.
775: */
1.225 dtucker 776: if (original_effective_uid == 0) {
777: PRIV_START;
778: permanently_set_uid(pw);
779: }
1.31 markus 780:
1.33 markus 781: /*
782: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 783: * directory if it doesn't already exist.
1.33 markus 784: */
1.326 dtucker 785: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1.316 djm 786: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.326 dtucker 787: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1.57 djm 788: if (mkdir(buf, 0700) < 0)
1.31 markus 789: error("Could not create directory '%.200s'.", buf);
790:
1.104 markus 791: /* load options.identity_files */
792: load_public_identity_files();
793:
794: /* Expand ~ in known host file names. */
795: /* XXX mem-leaks: */
1.72 markus 796: options.system_hostfile =
797: tilde_expand_filename(options.system_hostfile, original_real_uid);
798: options.user_hostfile =
799: tilde_expand_filename(options.user_hostfile, original_real_uid);
800: options.system_hostfile2 =
801: tilde_expand_filename(options.system_hostfile2, original_real_uid);
802: options.user_hostfile2 =
803: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 804:
805: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 806:
1.316 djm 807: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 808: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
809: pw, timeout_ms);
1.31 markus 810:
1.112 markus 811: /* We no longer need the private host keys. Clear them now. */
812: if (sensitive_data.nkeys != 0) {
813: for (i = 0; i < sensitive_data.nkeys; i++) {
814: if (sensitive_data.keys[i] != NULL) {
815: /* Destroys contents safely */
816: debug3("clear hostkey %d", i);
817: key_free(sensitive_data.keys[i]);
818: sensitive_data.keys[i] = NULL;
819: }
820: }
821: xfree(sensitive_data.keys);
1.134 markus 822: }
823: for (i = 0; i < options.num_identity_files; i++) {
824: if (options.identity_files[i]) {
825: xfree(options.identity_files[i]);
826: options.identity_files[i] = NULL;
827: }
828: if (options.identity_keys[i]) {
829: key_free(options.identity_keys[i]);
830: options.identity_keys[i] = NULL;
831: }
1.112 markus 832: }
1.31 markus 833:
1.45 markus 834: exit_status = compat20 ? ssh_session2() : ssh_session();
835: packet_close();
1.186 djm 836:
1.312 djm 837: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 838: unlink(options.control_path);
839:
1.186 djm 840: /*
1.203 djm 841: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 842: * case it hangs and instead rely on init to reap the child
843: */
844: if (proxy_command_pid > 1)
845: kill(proxy_command_pid, SIGHUP);
846:
1.45 markus 847: return exit_status;
848: }
849:
1.315 djm 850: /* Callback for remote forward global requests */
851: static void
852: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
853: {
854: Forward *rfwd = (Forward *)ctxt;
855:
1.324 djm 856: /* XXX verbose() on failure? */
1.315 djm 857: debug("remote forward %s for: listen %d, connect %s:%d",
858: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
859: rfwd->listen_port, rfwd->connect_host, rfwd->connect_port);
1.324 djm 860: if (type == SSH2_MSG_REQUEST_SUCCESS && rfwd->listen_port == 0) {
861: logit("Allocated port %u for remote forward to %s:%d",
862: packet_get_int(),
863: rfwd->connect_host, rfwd->connect_port);
864: }
865:
1.315 djm 866: if (type == SSH2_MSG_REQUEST_FAILURE) {
867: if (options.exit_on_forward_failure)
868: fatal("Error: remote port forwarding failed for "
869: "listen port %d", rfwd->listen_port);
870: else
871: logit("Warning: remote port forwarding failed for "
872: "listen port %d", rfwd->listen_port);
873: }
1.318 djm 874: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 875: debug("All remote forwarding requests processed");
1.318 djm 876: if (fork_after_authentication_flag) {
877: fork_after_authentication_flag = 0;
878: if (daemon(1, 1) < 0)
879: fatal("daemon() failed: %.200s",
880: strerror(errno));
881: }
882: }
1.315 djm 883: }
884:
1.126 itojun 885: static void
1.331 dtucker 886: client_cleanup_stdio_fwd(int id, void *arg)
887: {
888: debug("stdio forwarding: done");
889: cleanup_exit(0);
890: }
891:
892: static int
893: client_setup_stdio_fwd(const char *host_to_connect, u_short port_to_connect)
894: {
895: Channel *c;
1.332 djm 896: int in, out;
1.331 dtucker 897:
898: debug3("client_setup_stdio_fwd %s:%d", host_to_connect,
899: port_to_connect);
1.332 djm 900:
901: in = dup(STDIN_FILENO);
902: out = dup(STDOUT_FILENO);
903: if (in < 0 || out < 0)
904: fatal("channel_connect_stdio_fwd: dup() in/out failed");
905:
906: if ((c = channel_connect_stdio_fwd(host_to_connect, port_to_connect,
907: in, out)) == NULL)
1.331 dtucker 908: return 0;
909: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
910: return 1;
911: }
912:
913: static void
1.70 markus 914: ssh_init_forwarding(void)
915: {
1.86 markus 916: int success = 0;
1.70 markus 917: int i;
1.331 dtucker 918:
919: if (stdio_forward_host != NULL) {
920: if (!compat20) {
921: fatal("stdio forwarding require Protocol 2");
922: }
923: if (!client_setup_stdio_fwd(stdio_forward_host,
924: stdio_forward_port))
925: fatal("Failed to connect in stdio forward mode.");
926: }
1.86 markus 927:
1.70 markus 928: /* Initiate local TCP/IP port forwardings. */
929: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 930: debug("Local connections to %.200s:%d forwarded to remote "
931: "address %.200s:%d",
1.234 deraadt 932: (options.local_forwards[i].listen_host == NULL) ?
933: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 934: options.local_forwards[i].listen_host,
935: options.local_forwards[i].listen_port,
936: options.local_forwards[i].connect_host,
937: options.local_forwards[i].connect_port);
1.158 markus 938: success += channel_setup_local_fwd_listener(
1.232 djm 939: options.local_forwards[i].listen_host,
940: options.local_forwards[i].listen_port,
941: options.local_forwards[i].connect_host,
942: options.local_forwards[i].connect_port,
1.70 markus 943: options.gateway_ports);
944: }
1.283 markus 945: if (i > 0 && success != i && options.exit_on_forward_failure)
946: fatal("Could not request local forwarding.");
1.86 markus 947: if (i > 0 && success == 0)
948: error("Could not request local forwarding.");
1.70 markus 949:
950: /* Initiate remote TCP/IP port forwardings. */
951: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 952: debug("Remote connections from %.200s:%d forwarded to "
953: "local address %.200s:%d",
1.248 djm 954: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 955: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 956: options.remote_forwards[i].listen_port,
957: options.remote_forwards[i].connect_host,
958: options.remote_forwards[i].connect_port);
1.283 markus 959: if (channel_request_remote_forwarding(
1.232 djm 960: options.remote_forwards[i].listen_host,
961: options.remote_forwards[i].listen_port,
962: options.remote_forwards[i].connect_host,
1.283 markus 963: options.remote_forwards[i].connect_port) < 0) {
964: if (options.exit_on_forward_failure)
965: fatal("Could not request remote forwarding.");
966: else
967: logit("Warning: Could not request remote "
968: "forwarding.");
969: }
1.315 djm 970: client_register_global_confirm(ssh_confirm_remote_forward,
971: &options.remote_forwards[i]);
1.70 markus 972: }
1.301 djm 973:
974: /* Initiate tunnel forwarding. */
975: if (options.tun_open != SSH_TUNMODE_NO) {
976: if (client_request_tun_fwd(options.tun_open,
977: options.tun_local, options.tun_remote) == -1) {
978: if (options.exit_on_forward_failure)
979: fatal("Could not request tunnel forwarding.");
980: else
981: error("Could not request tunnel forwarding.");
982: }
983: }
1.70 markus 984: }
985:
1.126 itojun 986: static void
1.70 markus 987: check_agent_present(void)
988: {
989: if (options.forward_agent) {
1.254 djm 990: /* Clear agent forwarding if we don't have an agent. */
1.185 stevesk 991: if (!ssh_agent_present())
1.70 markus 992: options.forward_agent = 0;
993: }
994: }
995:
1.126 itojun 996: static int
1.45 markus 997: ssh_session(void)
998: {
999: int type;
1000: int interactive = 0;
1001: int have_tty = 0;
1002: struct winsize ws;
1003: char *cp;
1.243 djm 1004: const char *display;
1.45 markus 1005:
1.31 markus 1006: /* Enable compression if requested. */
1007: if (options.compression) {
1.316 djm 1008: debug("Requesting compression at level %d.",
1009: options.compression_level);
1.31 markus 1010:
1.316 djm 1011: if (options.compression_level < 1 ||
1012: options.compression_level > 9)
1013: fatal("Compression level must be from 1 (fast) to "
1014: "9 (slow, best).");
1.31 markus 1015:
1016: /* Send the request. */
1017: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1018: packet_put_int(options.compression_level);
1019: packet_send();
1020: packet_write_wait();
1.156 markus 1021: type = packet_read();
1.31 markus 1022: if (type == SSH_SMSG_SUCCESS)
1023: packet_start_compression(options.compression_level);
1024: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1025: logit("Warning: Remote host refused compression.");
1.31 markus 1026: else
1.316 djm 1027: packet_disconnect("Protocol error waiting for "
1028: "compression response.");
1.31 markus 1029: }
1030: /* Allocate a pseudo tty if appropriate. */
1031: if (tty_flag) {
1032: debug("Requesting pty.");
1033:
1034: /* Start the packet. */
1035: packet_start(SSH_CMSG_REQUEST_PTY);
1036:
1037: /* Store TERM in the packet. There is no limit on the
1038: length of the string. */
1039: cp = getenv("TERM");
1040: if (!cp)
1041: cp = "";
1.124 markus 1042: packet_put_cstring(cp);
1.31 markus 1043:
1044: /* Store window size in the packet. */
1045: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1046: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1047: packet_put_int((u_int)ws.ws_row);
1048: packet_put_int((u_int)ws.ws_col);
1049: packet_put_int((u_int)ws.ws_xpixel);
1050: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1051:
1052: /* Store tty modes in the packet. */
1.115 stevesk 1053: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1054:
1055: /* Send the packet, and wait for it to leave. */
1056: packet_send();
1057: packet_write_wait();
1058:
1059: /* Read response from the server. */
1.156 markus 1060: type = packet_read();
1.43 markus 1061: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1062: interactive = 1;
1.45 markus 1063: have_tty = 1;
1.43 markus 1064: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1065: logit("Warning: Remote host failed or refused to "
1066: "allocate a pseudo tty.");
1.31 markus 1067: else
1.316 djm 1068: packet_disconnect("Protocol error waiting for pty "
1069: "request response.");
1.31 markus 1070: }
1071: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1072: display = getenv("DISPLAY");
1073: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1074: char *proto, *data;
1.50 markus 1075: /* Get reasonable local authentication information. */
1.243 djm 1076: client_x11_get_proto(display, options.xauth_location,
1077: options.forward_x11_trusted, &proto, &data);
1.50 markus 1078: /* Request forwarding with authentication spoofing. */
1.316 djm 1079: debug("Requesting X11 forwarding with authentication "
1080: "spoofing.");
1.243 djm 1081: x11_request_forwarding_with_spoofing(0, display, proto, data);
1.31 markus 1082:
1083: /* Read response from the server. */
1.156 markus 1084: type = packet_read();
1.31 markus 1085: if (type == SSH_SMSG_SUCCESS) {
1086: interactive = 1;
1.50 markus 1087: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 1088: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 1089: } else {
1.316 djm 1090: packet_disconnect("Protocol error waiting for X11 "
1091: "forwarding");
1.50 markus 1092: }
1.31 markus 1093: }
1094: /* Tell the packet module whether this is an interactive session. */
1.80 markus 1095: packet_set_interactive(interactive);
1.31 markus 1096:
1097: /* Request authentication agent forwarding if appropriate. */
1.70 markus 1098: check_agent_present();
1099:
1.31 markus 1100: if (options.forward_agent) {
1101: debug("Requesting authentication agent forwarding.");
1102: auth_request_forwarding();
1103:
1104: /* Read response from the server. */
1.156 markus 1105: type = packet_read();
1.155 markus 1106: packet_check_eom();
1.31 markus 1107: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1108: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1109: }
1110:
1.70 markus 1111: /* Initiate port forwardings. */
1112: ssh_init_forwarding();
1.305 dtucker 1113:
1114: /* Execute a local command */
1115: if (options.local_command != NULL &&
1116: options.permit_local_command)
1117: ssh_local_cmd(options.local_command);
1.34 markus 1118:
1.318 djm 1119: /*
1120: * If requested and we are not interested in replies to remote
1121: * forwarding requests, then let ssh continue in the background.
1122: */
1123: if (fork_after_authentication_flag &&
1124: (!options.exit_on_forward_failure ||
1125: options.num_remote_forwards == 0)) {
1126: fork_after_authentication_flag = 0;
1.34 markus 1127: if (daemon(1, 1) < 0)
1128: fatal("daemon() failed: %.200s", strerror(errno));
1.318 djm 1129: }
1.31 markus 1130:
1.33 markus 1131: /*
1132: * If a command was specified on the command line, execute the
1133: * command now. Otherwise request the server to start a shell.
1134: */
1.31 markus 1135: if (buffer_len(&command) > 0) {
1136: int len = buffer_len(&command);
1137: if (len > 900)
1138: len = 900;
1.316 djm 1139: debug("Sending command: %.*s", len,
1140: (u_char *)buffer_ptr(&command));
1.31 markus 1141: packet_start(SSH_CMSG_EXEC_CMD);
1142: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1143: packet_send();
1144: packet_write_wait();
1145: } else {
1146: debug("Requesting shell.");
1147: packet_start(SSH_CMSG_EXEC_SHELL);
1148: packet_send();
1149: packet_write_wait();
1150: }
1151:
1152: /* Enter the interactive session. */
1.119 stevesk 1153: return client_loop(have_tty, tty_flag ?
1154: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.89 markus 1155: }
1156:
1.214 djm 1157: /* request pty/x11/agent/tcpfwd/shell for channel */
1158: static void
1159: ssh_session2_setup(int id, void *arg)
1160: {
1.215 djm 1161: extern char **environ;
1.243 djm 1162: const char *display;
1163: int interactive = tty_flag;
1.215 djm 1164:
1.248 djm 1165: display = getenv("DISPLAY");
1.243 djm 1166: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1167: char *proto, *data;
1.50 markus 1168: /* Get reasonable local authentication information. */
1.243 djm 1169: client_x11_get_proto(display, options.xauth_location,
1170: options.forward_x11_trusted, &proto, &data);
1.50 markus 1171: /* Request forwarding with authentication spoofing. */
1.316 djm 1172: debug("Requesting X11 forwarding with authentication "
1173: "spoofing.");
1.243 djm 1174: x11_request_forwarding_with_spoofing(id, display, proto, data);
1.80 markus 1175: interactive = 1;
1.50 markus 1176: /* XXX wait for reply */
1177: }
1178:
1.70 markus 1179: check_agent_present();
1180: if (options.forward_agent) {
1181: debug("Requesting authentication agent forwarding.");
1182: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1183: packet_send();
1.212 djm 1184: }
1185:
1.214 djm 1186: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1187: NULL, fileno(stdin), &command, environ);
1.90 markus 1188:
1.80 markus 1189: packet_set_interactive(interactive);
1.45 markus 1190: }
1191:
1.143 markus 1192: /* open new channel for a session */
1.126 itojun 1193: static int
1.143 markus 1194: ssh_session2_open(void)
1.45 markus 1195: {
1.118 markus 1196: Channel *c;
1197: int window, packetmax, in, out, err;
1.60 markus 1198:
1.62 markus 1199: if (stdin_null_flag) {
1.93 itojun 1200: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1201: } else {
1202: in = dup(STDIN_FILENO);
1203: }
1.60 markus 1204: out = dup(STDOUT_FILENO);
1205: err = dup(STDERR_FILENO);
1.45 markus 1206:
1207: if (in < 0 || out < 0 || err < 0)
1.62 markus 1208: fatal("dup() in/out/err failed");
1.45 markus 1209:
1.69 markus 1210: /* enable nonblocking unless tty */
1211: if (!isatty(in))
1212: set_nonblock(in);
1213: if (!isatty(out))
1214: set_nonblock(out);
1215: if (!isatty(err))
1216: set_nonblock(err);
1217:
1.65 markus 1218: window = CHAN_SES_WINDOW_DEFAULT;
1219: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1220: if (tty_flag) {
1221: window >>= 1;
1222: packetmax >>= 1;
1.45 markus 1223: }
1.118 markus 1224: c = channel_new(
1.45 markus 1225: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1226: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1227: "client-session", /*nonblock*/0);
1.45 markus 1228:
1.143 markus 1229: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1230:
1.122 markus 1231: channel_send_open(c->self);
1.143 markus 1232: if (!no_shell_flag)
1.310 djm 1233: channel_register_open_confirm(c->self,
1234: ssh_session2_setup, NULL);
1.106 markus 1235:
1.118 markus 1236: return c->self;
1.106 markus 1237: }
1238:
1.126 itojun 1239: static int
1.106 markus 1240: ssh_session2(void)
1241: {
1.143 markus 1242: int id = -1;
1.106 markus 1243:
1244: /* XXX should be pre-session */
1245: ssh_init_forwarding();
1246:
1.143 markus 1247: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1248: id = ssh_session2_open();
1.314 djm 1249:
1250: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1251: if (options.control_master == SSHCTL_MASTER_NO &&
1252: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1253: debug("Requesting no-more-sessions@openssh.com");
1254: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1255: packet_put_cstring("no-more-sessions@openssh.com");
1256: packet_put_char(0);
1257: packet_send();
1258: }
1.255 reyk 1259:
1260: /* Execute a local command */
1261: if (options.local_command != NULL &&
1262: options.permit_local_command)
1263: ssh_local_cmd(options.local_command);
1.301 djm 1264:
1265: /* Start listening for multiplex clients */
1.312 djm 1266: muxserver_listen();
1.106 markus 1267:
1268: /* If requested, let ssh continue in the background. */
1.318 djm 1269: if (fork_after_authentication_flag) {
1270: fork_after_authentication_flag = 0;
1.106 markus 1271: if (daemon(1, 1) < 0)
1272: fatal("daemon() failed: %.200s", strerror(errno));
1.318 djm 1273: }
1.327 andreas 1274:
1275: if (options.use_roaming)
1276: request_roaming();
1.31 markus 1277:
1.119 stevesk 1278: return client_loop(tty_flag, tty_flag ?
1279: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1280: }
1281:
1.126 itojun 1282: static void
1.104 markus 1283: load_public_identity_files(void)
1284: {
1.275 djm 1285: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1286: char *pwdir = NULL, *pwname = NULL;
1.167 markus 1287: int i = 0;
1.104 markus 1288: Key *public;
1.275 djm 1289: struct passwd *pw;
1.335 ! djm 1290: u_int n_ids;
! 1291: char *identity_files[SSH_MAX_IDENTITY_FILES];
! 1292: Key *identity_keys[SSH_MAX_IDENTITY_FILES];
1.333 markus 1293: #ifdef ENABLE_PKCS11
1.167 markus 1294: Key **keys;
1.333 markus 1295: int nkeys;
1.335 ! djm 1296: #endif /* PKCS11 */
1.104 markus 1297:
1.335 ! djm 1298: n_ids = 0;
! 1299: bzero(identity_files, sizeof(identity_files));
! 1300: bzero(identity_keys, sizeof(identity_keys));
! 1301:
! 1302: #ifdef ENABLE_PKCS11
1.333 markus 1303: if (options.pkcs11_provider != NULL &&
1.167 markus 1304: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1305: (pkcs11_init(!options.batch_mode) == 0) &&
1306: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1307: &keys)) > 0) {
1308: for (i = 0; i < nkeys; i++) {
1.335 ! djm 1309: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
! 1310: key_free(keys[i]);
! 1311: continue;
! 1312: }
! 1313: identity_keys[n_ids] = keys[i];
! 1314: identity_files[n_ids] =
1.333 markus 1315: xstrdup(options.pkcs11_provider); /* XXX */
1.335 ! djm 1316: n_ids++;
1.167 markus 1317: }
1318: xfree(keys);
1.127 markus 1319: }
1.333 markus 1320: #endif /* ENABLE_PKCS11 */
1.275 djm 1321: if ((pw = getpwuid(original_real_uid)) == NULL)
1322: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 1323: pwname = xstrdup(pw->pw_name);
1324: pwdir = xstrdup(pw->pw_dir);
1.275 djm 1325: if (gethostname(thishost, sizeof(thishost)) == -1)
1326: fatal("load_public_identity_files: gethostname: %s",
1327: strerror(errno));
1.335 ! djm 1328: for (i = 0; i < options.num_identity_files; i++) {
! 1329: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
! 1330: xfree(options.identity_files[i]);
! 1331: continue;
! 1332: }
1.275 djm 1333: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1334: original_real_uid);
1.306 deraadt 1335: filename = percent_expand(cp, "d", pwdir,
1336: "u", pwname, "l", thishost, "h", host,
1.275 djm 1337: "r", options.user, (char *)NULL);
1338: xfree(cp);
1.131 millert 1339: public = key_load_public(filename, NULL);
1340: debug("identity file %s type %d", filename,
1341: public ? public->type : -1);
1342: xfree(options.identity_files[i]);
1.335 ! djm 1343: identity_files[n_ids] = filename;
! 1344: identity_keys[n_ids] = public;
! 1345:
! 1346: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
! 1347: continue;
! 1348:
! 1349: /* Try to add the certificate variant too */
! 1350: xasprintf(&cp, "%s-cert", filename);
! 1351: public = key_load_public(cp, NULL);
! 1352: debug("identity file %s type %d", cp,
! 1353: public ? public->type : -1);
! 1354: if (public == NULL) {
! 1355: xfree(cp);
! 1356: continue;
! 1357: }
! 1358: if (!key_is_cert(public)) {
! 1359: debug("%s: key %s type %s is not a certificate",
! 1360: __func__, cp, key_type(public));
! 1361: key_free(public);
! 1362: xfree(cp);
! 1363: continue;
! 1364: }
! 1365: identity_keys[n_ids] = public;
! 1366: /* point to the original path, most likely the private key */
! 1367: identity_files[n_ids] = xstrdup(filename);
! 1368: n_ids++;
! 1369: }
! 1370: options.num_identity_files = n_ids;
! 1371: memcpy(options.identity_files, identity_files, sizeof(identity_files));
! 1372: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
! 1373:
1.306 deraadt 1374: bzero(pwname, strlen(pwname));
1.307 dtucker 1375: xfree(pwname);
1.306 deraadt 1376: bzero(pwdir, strlen(pwdir));
1.307 dtucker 1377: xfree(pwdir);
1.214 djm 1378: }
![[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