Annotation of src/usr.bin/ssh/ssh.c, Revision 1.577
1.577 ! djm 1: /* $OpenBSD: ssh.c,v 1.576 2022/09/17 10:33:18 djm 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: *
1.529 dtucker 19: * Modified to work with SSLeay by Niels Provos <provos@citi.umich.edu>
1.64 deraadt 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>
45: #include <sys/queue.h>
1.259 stevesk 46: #include <sys/resource.h>
1.280 stevesk 47: #include <sys/socket.h>
1.264 stevesk 48: #include <sys/stat.h>
1.312 djm 49: #include <sys/time.h>
1.352 djm 50: #include <sys/wait.h>
1.258 stevesk 51:
1.265 stevesk 52: #include <ctype.h>
1.285 stevesk 53: #include <errno.h>
1.281 stevesk 54: #include <fcntl.h>
1.286 stevesk 55: #include <netdb.h>
1.258 stevesk 56: #include <paths.h>
1.279 stevesk 57: #include <pwd.h>
1.263 stevesk 58: #include <signal.h>
1.287 stevesk 59: #include <stddef.h>
1.291 stevesk 60: #include <stdio.h>
1.290 stevesk 61: #include <stdlib.h>
1.289 stevesk 62: #include <string.h>
1.509 naddy 63: #include <stdarg.h>
1.288 stevesk 64: #include <unistd.h>
1.414 deraadt 65: #include <limits.h>
1.445 djm 66: #include <locale.h>
1.49 markus 67:
1.402 markus 68: #ifdef WITH_OPENSSL
1.49 markus 69: #include <openssl/evp.h>
1.72 markus 70: #include <openssl/err.h>
1.402 markus 71: #endif
1.1 deraadt 72:
1.293 deraadt 73: #include "xmalloc.h"
1.84 markus 74: #include "ssh.h"
75: #include "ssh2.h"
1.341 djm 76: #include "canohost.h"
1.84 markus 77: #include "compat.h"
78: #include "cipher.h"
1.1 deraadt 79: #include "packet.h"
1.482 markus 80: #include "sshbuf.h"
1.123 markus 81: #include "channels.h"
1.483 markus 82: #include "sshkey.h"
1.58 markus 83: #include "authfd.h"
1.49 markus 84: #include "authfile.h"
1.83 markus 85: #include "pathnames.h"
1.214 djm 86: #include "dispatch.h"
1.81 markus 87: #include "clientloop.h"
1.84 markus 88: #include "log.h"
1.406 millert 89: #include "misc.h"
1.84 markus 90: #include "readconf.h"
91: #include "sshconnect.h"
1.95 markus 92: #include "kex.h"
93: #include "mac.h"
1.213 deraadt 94: #include "sshpty.h"
1.212 djm 95: #include "match.h"
1.214 djm 96: #include "msg.h"
1.278 stevesk 97: #include "version.h"
1.412 djm 98: #include "ssherr.h"
1.420 djm 99: #include "myproposal.h"
1.49 markus 100:
1.333 markus 101: #ifdef ENABLE_PKCS11
102: #include "ssh-pkcs11.h"
1.137 jakob 103: #endif
1.498 djm 104:
1.49 markus 105: extern char *__progname;
1.1 deraadt 106:
1.316 djm 107: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 108: int debug_flag = 0;
109:
1.359 djm 110: /* Flag indicating whether a tty should be requested */
1.1 deraadt 111: int tty_flag = 0;
112:
1.33 markus 113: /*
1.344 djm 114: * Flag indicating that the current process should be backgrounded and
1.531 djm 115: * a new mux-client launched in the foreground for ControlPersist.
1.344 djm 116: */
117: int need_controlpersist_detach = 0;
118:
1.531 djm 119: /* Copies of flags for ControlPersist foreground mux-client */
1.560 djm 120: int ostdin_null_flag, osession_type, otty_flag, orequest_tty;
1.344 djm 121:
122: /*
1.33 markus 123: * General data structure for command line options and options configurable
124: * in configuration files. See readconf.h.
125: */
1.1 deraadt 126: Options options;
127:
1.139 markus 128: /* optional user configfile */
129: char *config = NULL;
130:
1.33 markus 131: /*
132: * Name of the host we are connecting to. This is the name given on the
1.503 jmc 133: * command line, or the Hostname specified for the user-supplied name in a
1.33 markus 134: * configuration file.
135: */
1.1 deraadt 136: char *host;
137:
1.510 djm 138: /*
139: * A config can specify a path to forward, overriding SSH_AUTH_SOCK. If this is
140: * not NULL, forward the socket at this path instead.
141: */
142: char *forward_agent_sock_path = NULL;
143:
1.22 provos 144: /* socket address the host resolves to */
1.37 markus 145: struct sockaddr_storage hostaddr;
1.1 deraadt 146:
1.112 markus 147: /* Private host keys. */
1.173 markus 148: Sensitive sensitive_data;
1.1 deraadt 149:
1.45 markus 150: /* command to be executed */
1.482 markus 151: struct sshbuf *command;
1.45 markus 152:
1.170 markus 153: /* # of replies received for global requests */
1.523 djm 154: static int forward_confirms_pending = -1;
1.170 markus 155:
1.313 djm 156: /* mux.c */
157: extern int muxserver_sock;
158: extern u_int muxclient_command;
159:
1.1 deraadt 160: /* Prints a help message to the user. This function never returns. */
161:
1.126 itojun 162: static void
1.93 itojun 163: usage(void)
1.1 deraadt 164: {
1.208 markus 165: fprintf(stderr,
1.474 djm 166: "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n"
167: " [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n"
168: " [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n"
169: " [-i identity_file] [-J [user@]host[:port]] [-L address]\n"
170: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
171: " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
1.567 dtucker 172: " [-w local_tun[:remote_tun]] destination [command [argument ...]]\n"
1.208 markus 173: );
1.257 dtucker 174: exit(255);
1.1 deraadt 175: }
176:
1.544 djm 177: static int ssh_session2(struct ssh *, const struct ssh_conn_info *);
178: static void load_public_identity_files(const struct ssh_conn_info *);
1.352 djm 179: static void main_sigchld_handler(int);
1.312 djm 180:
1.361 djm 181: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
182: static void
183: tilde_expand_paths(char **paths, u_int num_paths)
184: {
185: u_int i;
186: char *cp;
187:
188: for (i = 0; i < num_paths; i++) {
1.490 dtucker 189: cp = tilde_expand_filename(paths[i], getuid());
1.378 djm 190: free(paths[i]);
1.361 djm 191: paths[i] = cp;
192: }
193: }
194:
1.527 dtucker 195: /*
196: * Expands the set of percent_expand options used by the majority of keywords
197: * in the client that support percent expansion.
198: * Caller must free returned string.
199: */
200: static char *
1.544 djm 201: default_client_percent_expand(const char *str,
202: const struct ssh_conn_info *cinfo)
1.527 dtucker 203: {
204: return percent_expand(str,
1.546 djm 205: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.527 dtucker 206: (char *)NULL);
207: }
208:
1.400 djm 209: /*
1.528 dtucker 210: * Expands the set of percent_expand options used by the majority of keywords
211: * AND perform environment variable substitution.
212: * Caller must free returned string.
213: */
214: static char *
1.544 djm 215: default_client_percent_dollar_expand(const char *str,
216: const struct ssh_conn_info *cinfo)
1.528 dtucker 217: {
218: char *ret;
219:
220: ret = percent_dollar_expand(str,
1.546 djm 221: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.528 dtucker 222: (char *)NULL);
223: if (ret == NULL)
224: fatal("invalid environment variable expansion");
225: return ret;
226: }
227:
228: /*
1.400 djm 229: * Attempt to resolve a host name / port to a set of addresses and
230: * optionally return any CNAMEs encountered along the way.
231: * Returns NULL on failure.
232: * NB. this function must operate with a options having undefined members.
233: */
1.385 djm 234: static struct addrinfo *
1.400 djm 235: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 236: {
237: char strport[NI_MAXSERV];
238: struct addrinfo hints, *res;
1.501 dtucker 239: int gaierr;
240: LogLevel loglevel = SYSLOG_LEVEL_DEBUG1;
1.385 djm 241:
1.400 djm 242: if (port <= 0)
243: port = default_ssh_port();
1.521 markus 244: if (cname != NULL)
245: *cname = '\0';
1.568 djm 246: debug3_f("lookup %s:%d", name, port);
1.400 djm 247:
1.427 djm 248: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 249: memset(&hints, 0, sizeof(hints));
1.400 djm 250: hints.ai_family = options.address_family == -1 ?
251: AF_UNSPEC : options.address_family;
1.385 djm 252: hints.ai_socktype = SOCK_STREAM;
253: if (cname != NULL)
254: hints.ai_flags = AI_CANONNAME;
255: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
256: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
257: loglevel = SYSLOG_LEVEL_ERROR;
258: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
259: __progname, name, ssh_gai_strerror(gaierr));
260: return NULL;
261: }
262: if (cname != NULL && res->ai_canonname != NULL) {
263: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
1.540 djm 264: error_f("host \"%s\" cname \"%s\" too long (max %lu)",
265: name, res->ai_canonname, (u_long)clen);
1.385 djm 266: if (clen > 0)
267: *cname = '\0';
268: }
269: }
270: return res;
271: }
272:
1.470 djm 273: /* Returns non-zero if name can only be an address and not a hostname */
274: static int
275: is_addr_fast(const char *name)
276: {
277: return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
278: strspn(name, "0123456789.") == strlen(name));
279: }
280:
281: /* Returns non-zero if name represents a valid, single address */
282: static int
283: is_addr(const char *name)
284: {
285: char strport[NI_MAXSERV];
286: struct addrinfo hints, *res;
287:
288: if (is_addr_fast(name))
289: return 1;
290:
291: snprintf(strport, sizeof strport, "%u", default_ssh_port());
292: memset(&hints, 0, sizeof(hints));
293: hints.ai_family = options.address_family == -1 ?
294: AF_UNSPEC : options.address_family;
295: hints.ai_socktype = SOCK_STREAM;
296: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
297: if (getaddrinfo(name, strport, &hints, &res) != 0)
298: return 0;
299: if (res == NULL || res->ai_next != NULL) {
300: freeaddrinfo(res);
301: return 0;
302: }
303: freeaddrinfo(res);
304: return 1;
305: }
306:
1.385 djm 307: /*
1.413 djm 308: * Attempt to resolve a numeric host address / port to a single address.
309: * Returns a canonical address string.
310: * Returns NULL on failure.
311: * NB. this function must operate with a options having undefined members.
312: */
313: static struct addrinfo *
314: resolve_addr(const char *name, int port, char *caddr, size_t clen)
315: {
316: char addr[NI_MAXHOST], strport[NI_MAXSERV];
317: struct addrinfo hints, *res;
318: int gaierr;
319:
320: if (port <= 0)
321: port = default_ssh_port();
322: snprintf(strport, sizeof strport, "%u", port);
323: memset(&hints, 0, sizeof(hints));
324: hints.ai_family = options.address_family == -1 ?
325: AF_UNSPEC : options.address_family;
326: hints.ai_socktype = SOCK_STREAM;
327: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
328: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
1.540 djm 329: debug2_f("could not resolve name %.100s as address: %s",
330: name, ssh_gai_strerror(gaierr));
1.413 djm 331: return NULL;
332: }
333: if (res == NULL) {
1.540 djm 334: debug_f("getaddrinfo %.100s returned no addresses", name);
1.413 djm 335: return NULL;
336: }
337: if (res->ai_next != NULL) {
1.540 djm 338: debug_f("getaddrinfo %.100s returned multiple addresses", name);
1.413 djm 339: goto fail;
340: }
341: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
342: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
1.540 djm 343: debug_f("Could not format address for name %.100s: %s",
344: name, ssh_gai_strerror(gaierr));
1.413 djm 345: goto fail;
346: }
347: if (strlcpy(caddr, addr, clen) >= clen) {
1.540 djm 348: error_f("host \"%s\" addr \"%s\" too long (max %lu)",
349: name, addr, (u_long)clen);
1.413 djm 350: if (clen > 0)
351: *caddr = '\0';
352: fail:
353: freeaddrinfo(res);
354: return NULL;
355: }
356: return res;
357: }
358:
359: /*
1.385 djm 360: * Check whether the cname is a permitted replacement for the hostname
361: * and perform the replacement if it is.
1.400 djm 362: * NB. this function must operate with a options having undefined members.
1.385 djm 363: */
364: static int
1.443 djm 365: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 366: {
367: int i;
368: struct allowed_cname *rule;
369:
1.568 djm 370: if (*cname == '\0' || !config_has_permitted_cnames(&options) ||
1.385 djm 371: strcmp(*namep, cname) == 0)
372: return 0;
1.386 djm 373: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 374: return 0;
375: /*
1.386 djm 376: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 377: * a proxy or jump host unless the user specifically requests so.
1.385 djm 378: */
1.443 djm 379: if (!direct &&
1.386 djm 380: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 381: return 0;
1.540 djm 382: debug3_f("check \"%s\" CNAME \"%s\"", *namep, cname);
1.385 djm 383: for (i = 0; i < options.num_permitted_cnames; i++) {
384: rule = options.permitted_cnames + i;
1.418 djm 385: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
386: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 387: continue;
1.386 djm 388: verbose("Canonicalized DNS aliased hostname "
1.385 djm 389: "\"%s\" => \"%s\"", *namep, cname);
390: free(*namep);
391: *namep = xstrdup(cname);
392: return 1;
393: }
394: return 0;
395: }
396:
397: /*
398: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 399: * canonicalization rules. Returns the address list for the host or NULL
400: * if no name was found after canonicalization.
1.400 djm 401: * NB. this function must operate with a options having undefined members.
1.385 djm 402: */
403: static struct addrinfo *
1.400 djm 404: resolve_canonicalize(char **hostp, int port)
1.385 djm 405: {
1.443 djm 406: int i, direct, ndots;
1.413 djm 407: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 408: struct addrinfo *addrs;
409:
410: /*
1.470 djm 411: * Attempt to canonicalise addresses, regardless of
412: * whether hostname canonicalisation was requested
1.385 djm 413: */
1.413 djm 414: if ((addrs = resolve_addr(*hostp, port,
415: newname, sizeof(newname))) != NULL) {
1.540 djm 416: debug2_f("hostname %.100s is address", *hostp);
1.413 djm 417: if (strcasecmp(*hostp, newname) != 0) {
1.540 djm 418: debug2_f("canonicalised address \"%s\" => \"%s\"",
419: *hostp, newname);
1.413 djm 420: free(*hostp);
421: *hostp = xstrdup(newname);
422: }
423: return addrs;
424: }
425:
1.470 djm 426: /*
427: * If this looks like an address but didn't parse as one, it might
428: * be an address with an invalid interface scope. Skip further
429: * attempts at canonicalisation.
430: */
431: if (is_addr_fast(*hostp)) {
1.540 djm 432: debug_f("hostname %.100s is an unrecognised address", *hostp);
1.470 djm 433: return NULL;
434: }
435:
436: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
437: return NULL;
438:
439: /*
440: * Don't attempt to canonicalize names that will be interpreted by
441: * a proxy unless the user specifically requests so.
442: */
443: direct = option_clear_or_none(options.proxy_command) &&
444: options.jump_host == NULL;
445: if (!direct &&
446: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
447: return NULL;
448:
1.428 djm 449: /* If domain name is anchored, then resolve it now */
450: if ((*hostp)[strlen(*hostp) - 1] == '.') {
1.540 djm 451: debug3_f("name is fully qualified");
1.428 djm 452: fullhost = xstrdup(*hostp);
453: if ((addrs = resolve_host(fullhost, port, 0,
454: newname, sizeof(newname))) != NULL)
455: goto found;
456: free(fullhost);
457: goto notfound;
458: }
459:
1.387 djm 460: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 461: ndots = 0;
462: for (cp = *hostp; *cp != '\0'; cp++) {
463: if (*cp == '.')
464: ndots++;
465: }
1.386 djm 466: if (ndots > options.canonicalize_max_dots) {
1.540 djm 467: debug3_f("not canonicalizing hostname \"%s\" (max dots %d)",
468: *hostp, options.canonicalize_max_dots);
1.385 djm 469: return NULL;
470: }
471: /* Attempt each supplied suffix */
472: for (i = 0; i < options.num_canonical_domains; i++) {
1.559 djm 473: if (strcasecmp(options.canonical_domains[i], "none") == 0)
474: break;
1.385 djm 475: xasprintf(&fullhost, "%s.%s.", *hostp,
476: options.canonical_domains[i]);
1.540 djm 477: debug3_f("attempting \"%s\" => \"%s\"", *hostp, fullhost);
1.400 djm 478: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 479: newname, sizeof(newname))) == NULL) {
1.385 djm 480: free(fullhost);
481: continue;
482: }
1.428 djm 483: found:
1.385 djm 484: /* Remove trailing '.' */
485: fullhost[strlen(fullhost) - 1] = '\0';
486: /* Follow CNAME if requested */
1.443 djm 487: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 488: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 489: *hostp, fullhost);
490: }
491: free(*hostp);
492: *hostp = fullhost;
493: return addrs;
494: }
1.428 djm 495: notfound:
1.386 djm 496: if (!options.canonicalize_fallback_local)
1.400 djm 497: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
1.540 djm 498: debug2_f("host %s not found in any suffix", *hostp);
1.385 djm 499: return NULL;
500: }
501:
1.32 deraadt 502: /*
1.576 djm 503: * Check the result of hostkey loading, ignoring some errors and either
504: * discarding the key or fatal()ing for others.
1.483 markus 505: */
506: static void
1.576 djm 507: check_load(int r, struct sshkey **k, const char *path, const char *message)
1.483 markus 508: {
509: switch (r) {
510: case 0:
1.576 djm 511: /* Check RSA keys size and discard if undersized */
512: if (k != NULL && *k != NULL &&
513: (r = sshkey_check_rsa_length(*k,
514: options.required_rsa_size)) != 0) {
515: error_r(r, "load %s \"%s\"", message, path);
516: free(*k);
517: *k = NULL;
518: }
1.483 markus 519: break;
520: case SSH_ERR_INTERNAL_ERROR:
521: case SSH_ERR_ALLOC_FAIL:
1.540 djm 522: fatal_r(r, "load %s \"%s\"", message, path);
1.483 markus 523: case SSH_ERR_SYSTEM_ERROR:
524: /* Ignore missing files */
525: if (errno == ENOENT)
526: break;
527: /* FALLTHROUGH */
528: default:
1.540 djm 529: error_r(r, "load %s \"%s\"", message, path);
1.483 markus 530: break;
531: }
532: }
533:
534: /*
1.400 djm 535: * Read per-user configuration file. Ignore the system wide config
536: * file if the user specifies a config file on the command line.
537: */
538: static void
1.496 djm 539: process_config_files(const char *host_name, struct passwd *pw, int final_pass,
540: int *want_final_pass)
1.400 djm 541: {
1.414 deraadt 542: char buf[PATH_MAX];
1.400 djm 543: int r;
544:
545: if (config != NULL) {
546: if (strcasecmp(config, "none") != 0 &&
1.466 djm 547: !read_config_file(config, pw, host, host_name, &options,
1.496 djm 548: SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0),
549: want_final_pass))
1.400 djm 550: fatal("Can't open user config file %.100s: "
551: "%.100s", config, strerror(errno));
552: } else {
553: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
554: _PATH_SSH_USER_CONFFILE);
555: if (r > 0 && (size_t)r < sizeof(buf))
1.466 djm 556: (void)read_config_file(buf, pw, host, host_name,
1.408 djm 557: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
1.496 djm 558: (final_pass ? SSHCONF_FINAL : 0), want_final_pass);
1.400 djm 559:
560: /* Read systemwide configuration file after user config. */
1.408 djm 561: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
1.466 djm 562: host, host_name, &options,
1.496 djm 563: final_pass ? SSHCONF_FINAL : 0, want_final_pass);
1.408 djm 564: }
565: }
566:
567: /* Rewrite the port number in an addrinfo list of addresses */
568: static void
569: set_addrinfo_port(struct addrinfo *addrs, int port)
570: {
571: struct addrinfo *addr;
572:
573: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
574: switch (addr->ai_family) {
575: case AF_INET:
576: ((struct sockaddr_in *)addr->ai_addr)->
577: sin_port = htons(port);
578: break;
579: case AF_INET6:
580: ((struct sockaddr_in6 *)addr->ai_addr)->
581: sin6_port = htons(port);
582: break;
583: }
1.400 djm 584: }
585: }
586:
1.544 djm 587: static void
588: ssh_conn_info_free(struct ssh_conn_info *cinfo)
589: {
590: if (cinfo == NULL)
591: return;
592: free(cinfo->conn_hash_hex);
593: free(cinfo->shorthost);
594: free(cinfo->uidstr);
595: free(cinfo->keyalias);
596: free(cinfo->thishost);
597: free(cinfo->host_arg);
598: free(cinfo->portstr);
599: free(cinfo->remhost);
600: free(cinfo->remuser);
601: free(cinfo->homedir);
602: free(cinfo->locuser);
603: free(cinfo);
604: }
605:
1.400 djm 606: /*
1.32 deraadt 607: * Main program for the ssh client.
608: */
1.2 provos 609: int
610: main(int ac, char **av)
1.1 deraadt 611: {
1.437 djm 612: struct ssh *ssh = NULL;
1.462 djm 613: int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
1.496 djm 614: int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
1.544 djm 615: char *p, *cp, *line, *argv0, *logfile, *host_arg;
616: char cname[NI_MAXHOST], thishost[NI_MAXHOST];
1.31 markus 617: struct stat st;
1.98 markus 618: struct passwd *pw;
1.144 stevesk 619: extern int optind, optreset;
620: extern char *optarg;
1.406 millert 621: struct Forward fwd;
1.385 djm 622: struct addrinfo *addrs = NULL;
1.513 dtucker 623: size_t n, len;
1.532 dtucker 624: u_int j;
1.544 djm 625: struct ssh_conn_info *cinfo = NULL;
1.250 djm 626:
627: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
628: sanitise_stdfd();
1.31 markus 629:
1.33 markus 630: /*
1.346 djm 631: * Discard other fds that are hanging around. These can cause problem
632: * with backgrounded ssh processes started by ControlPersist.
633: */
634: closefrom(STDERR_FILENO + 1);
635:
1.487 dtucker 636: if (getuid() != geteuid())
637: fatal("ssh setuid not supported.");
638: if (getgid() != getegid())
639: fatal("ssh setgid not supported.");
1.184 stevesk 640:
1.107 markus 641: /* Get user data. */
1.490 dtucker 642: pw = getpwuid(getuid());
1.107 markus 643: if (!pw) {
1.490 dtucker 644: logit("No user exists for uid %lu", (u_long)getuid());
1.257 dtucker 645: exit(255);
1.107 markus 646: }
647: /* Take a copy of the returned structure. */
648: pw = pwcopy(pw);
1.31 markus 649:
1.33 markus 650: /*
651: * Set our umask to something reasonable, as some files are created
652: * with the default umask. This will make them world-readable but
653: * writable only by the owner, which is ok for all files for which we
654: * don't set the modes explicitly.
655: */
1.577 ! djm 656: umask(022 | umask(077));
1.445 djm 657:
658: setlocale(LC_CTYPE, "");
1.31 markus 659:
1.316 djm 660: /*
661: * Initialize option structure to indicate that no values have been
662: * set.
663: */
1.31 markus 664: initialize_options(&options);
665:
1.463 djm 666: /*
667: * Prepare main ssh transport/connection structures
668: */
669: if ((ssh = ssh_alloc_session_state()) == NULL)
670: fatal("Couldn't allocate session state");
671: channel_init_channels(ssh);
672:
1.31 markus 673: /* Parse command-line arguments. */
674: host = NULL;
1.320 djm 675: use_syslog = 0;
1.375 dtucker 676: logfile = NULL;
1.325 markus 677: argv0 = av[0];
1.31 markus 678:
1.266 djm 679: again:
1.316 djm 680: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.574 djm 681: "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) { /* HUZdhjruz */
1.31 markus 682: switch (opt) {
1.91 jakob 683: case '1':
1.454 djm 684: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 685: break;
1.47 markus 686: case '2':
1.454 djm 687: /* Ignored */
1.47 markus 688: break;
1.37 markus 689: case '4':
1.196 djm 690: options.address_family = AF_INET;
1.37 markus 691: break;
692: case '6':
1.196 djm 693: options.address_family = AF_INET6;
1.37 markus 694: break;
1.31 markus 695: case 'n':
1.563 djm 696: options.stdin_null = 1;
1.31 markus 697: break;
698: case 'f':
1.564 djm 699: options.fork_after_authentication = 1;
1.563 djm 700: options.stdin_null = 1;
1.31 markus 701: break;
702: case 'x':
703: options.forward_x11 = 0;
704: break;
705: case 'X':
706: options.forward_x11 = 1;
707: break;
1.320 djm 708: case 'y':
709: use_syslog = 1;
710: break;
1.375 dtucker 711: case 'E':
1.422 dtucker 712: logfile = optarg;
1.375 dtucker 713: break;
1.408 djm 714: case 'G':
715: config_test = 1;
716: break;
1.202 markus 717: case 'Y':
718: options.forward_x11 = 1;
719: options.forward_x11_trusted = 1;
720: break;
1.31 markus 721: case 'g':
1.406 millert 722: options.fwd_opts.gateway_ports = 1;
1.31 markus 723: break;
1.229 djm 724: case 'O':
1.441 dtucker 725: if (options.stdio_forward_host != NULL)
1.332 djm 726: fatal("Cannot specify multiplexing "
727: "command with -W");
728: else if (muxclient_command != 0)
729: fatal("Multiplexing command already specified");
1.229 djm 730: if (strcmp(optarg, "check") == 0)
1.312 djm 731: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 732: else if (strcmp(optarg, "forward") == 0)
733: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 734: else if (strcmp(optarg, "exit") == 0)
1.312 djm 735: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 736: else if (strcmp(optarg, "stop") == 0)
737: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 738: else if (strcmp(optarg, "cancel") == 0)
739: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 740: else if (strcmp(optarg, "proxy") == 0)
741: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 742: else
743: fatal("Invalid multiplex command.");
744: break;
1.183 stevesk 745: case 'P': /* deprecated */
1.376 djm 746: break;
1.394 deraadt 747: case 'Q':
1.376 djm 748: cp = NULL;
1.519 dtucker 749: if (strcmp(optarg, "cipher") == 0 ||
750: strcasecmp(optarg, "Ciphers") == 0)
1.393 djm 751: cp = cipher_alg_list('\n', 0);
1.394 deraadt 752: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 753: cp = cipher_alg_list('\n', 1);
1.519 dtucker 754: else if (strcmp(optarg, "mac") == 0 ||
755: strcasecmp(optarg, "MACs") == 0)
1.392 dtucker 756: cp = mac_alg_list('\n');
1.519 dtucker 757: else if (strcmp(optarg, "kex") == 0 ||
758: strcasecmp(optarg, "KexAlgorithms") == 0)
1.392 dtucker 759: cp = kex_alg_list('\n');
1.394 deraadt 760: else if (strcmp(optarg, "key") == 0)
1.451 djm 761: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 762: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 763: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 764: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 765: cp = sshkey_alg_list(0, 1, 0, '\n');
1.519 dtucker 766: else if (strcmp(optarg, "key-sig") == 0 ||
1.547 dtucker 767: strcasecmp(optarg, "PubkeyAcceptedKeyTypes") == 0 || /* deprecated name */
768: strcasecmp(optarg, "PubkeyAcceptedAlgorithms") == 0 ||
1.519 dtucker 769: strcasecmp(optarg, "HostKeyAlgorithms") == 0 ||
1.548 dtucker 770: strcasecmp(optarg, "HostbasedKeyTypes") == 0 || /* deprecated name */
771: strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 0 || /* deprecated name */
772: strcasecmp(optarg, "HostbasedAcceptedAlgorithms") == 0)
1.519 dtucker 773: cp = sshkey_alg_list(0, 0, 1, '\n');
1.491 djm 774: else if (strcmp(optarg, "sig") == 0)
1.492 djm 775: cp = sshkey_alg_list(0, 1, 1, '\n');
1.491 djm 776: else if (strcmp(optarg, "protocol-version") == 0)
1.416 djm 777: cp = xstrdup("2");
1.513 dtucker 778: else if (strcmp(optarg, "compression") == 0) {
779: cp = xstrdup(compression_alg_list(0));
780: len = strlen(cp);
781: for (n = 0; n < len; n++)
782: if (cp[n] == ',')
783: cp[n] = '\n';
784: } else if (strcmp(optarg, "help") == 0) {
1.491 djm 785: cp = xstrdup(
1.513 dtucker 786: "cipher\ncipher-auth\ncompression\nkex\n"
1.519 dtucker 787: "key\nkey-cert\nkey-plain\nkey-sig\nmac\n"
1.491 djm 788: "protocol-version\nsig");
1.416 djm 789: }
1.376 djm 790: if (cp == NULL)
791: fatal("Unsupported query \"%s\"", optarg);
792: printf("%s\n", cp);
793: free(cp);
794: exit(0);
1.31 markus 795: break;
796: case 'a':
797: options.forward_agent = 0;
1.53 markus 798: break;
799: case 'A':
800: options.forward_agent = 1;
1.31 markus 801: break;
802: case 'k':
1.204 dtucker 803: options.gss_deleg_creds = 0;
1.297 djm 804: break;
805: case 'K':
806: options.gss_authentication = 1;
807: options.gss_deleg_creds = 1;
1.31 markus 808: break;
809: case 'i':
1.490 dtucker 810: p = tilde_expand_filename(optarg, getuid());
1.505 deraadt 811: if (stat(p, &st) == -1)
1.128 fgsch 812: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 813: "not accessible: %s.\n", p,
1.231 otto 814: strerror(errno));
1.429 dtucker 815: else
816: add_identity_file(&options, NULL, p, 1);
817: free(p);
1.31 markus 818: break;
1.127 markus 819: case 'I':
1.333 markus 820: #ifdef ENABLE_PKCS11
1.422 dtucker 821: free(options.pkcs11_provider);
1.333 markus 822: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 823: #else
1.333 markus 824: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 825: #endif
1.127 markus 826: break;
1.443 djm 827: case 'J':
1.504 djm 828: if (options.jump_host != NULL) {
829: fatal("Only a single -J option is permitted "
830: "(use commas to separate multiple "
831: "jump hops)");
832: }
1.443 djm 833: if (options.proxy_command != NULL)
834: fatal("Cannot specify -J with ProxyCommand");
835: if (parse_jump(optarg, &options, 1) == -1)
836: fatal("Invalid -J argument");
837: options.proxy_command = xstrdup("none");
838: break;
1.31 markus 839: case 't':
1.359 djm 840: if (options.request_tty == REQUEST_TTY_YES)
841: options.request_tty = REQUEST_TTY_FORCE;
842: else
843: options.request_tty = REQUEST_TTY_YES;
1.31 markus 844: break;
845: case 'v':
1.197 markus 846: if (debug_flag == 0) {
1.66 markus 847: debug_flag = 1;
848: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 849: } else {
1.443 djm 850: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
851: debug_flag++;
1.197 markus 852: options.log_level++;
1.443 djm 853: }
1.197 markus 854: }
1.375 dtucker 855: break;
1.31 markus 856: case 'V':
1.209 markus 857: fprintf(stderr, "%s, %s\n",
1.541 dtucker 858: SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 859: if (opt == 'V')
860: exit(0);
861: break;
1.255 reyk 862: case 'w':
1.256 reyk 863: if (options.tun_open == -1)
864: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 865: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 866: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 867: fprintf(stderr,
868: "Bad tun device '%s'\n", optarg);
1.257 dtucker 869: exit(255);
1.255 reyk 870: }
871: break;
1.331 dtucker 872: case 'W':
1.441 dtucker 873: if (options.stdio_forward_host != NULL)
1.332 djm 874: fatal("stdio forward already specified");
875: if (muxclient_command != 0)
876: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 877: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 878: options.stdio_forward_host = fwd.listen_host;
879: options.stdio_forward_port = fwd.listen_port;
1.378 djm 880: free(fwd.connect_host);
1.331 dtucker 881: } else {
882: fprintf(stderr,
883: "Bad stdio forwarding specification '%s'\n",
884: optarg);
885: exit(255);
886: }
1.359 djm 887: options.request_tty = REQUEST_TTY_NO;
1.560 djm 888: options.session_type = SESSION_TYPE_NONE;
1.331 dtucker 889: break;
1.31 markus 890: case 'q':
891: options.log_level = SYSLOG_LEVEL_QUIET;
892: break;
893: case 'e':
894: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 895: (u_char) optarg[1] >= 64 &&
896: (u_char) optarg[1] < 128)
1.78 markus 897: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 898: else if (strlen(optarg) == 1)
1.78 markus 899: options.escape_char = (u_char) optarg[0];
1.31 markus 900: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 901: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 902: else {
1.128 fgsch 903: fprintf(stderr, "Bad escape character '%s'.\n",
904: optarg);
1.257 dtucker 905: exit(255);
1.31 markus 906: }
907: break;
908: case 'c':
1.506 naddy 909: if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
1.420 djm 910: optarg + 1 : optarg)) {
911: fprintf(stderr, "Unknown cipher type '%s'\n",
912: optarg);
913: exit(255);
1.95 markus 914: }
1.456 djm 915: free(options.ciphers);
916: options.ciphers = xstrdup(optarg);
1.95 markus 917: break;
918: case 'm':
1.422 dtucker 919: if (mac_valid(optarg)) {
920: free(options.macs);
1.95 markus 921: options.macs = xstrdup(optarg);
1.422 dtucker 922: } else {
1.128 fgsch 923: fprintf(stderr, "Unknown mac type '%s'\n",
924: optarg);
1.257 dtucker 925: exit(255);
1.31 markus 926: }
927: break;
1.214 djm 928: case 'M':
1.242 djm 929: if (options.control_master == SSHCTL_MASTER_YES)
930: options.control_master = SSHCTL_MASTER_ASK;
931: else
932: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 933: break;
1.31 markus 934: case 'p':
1.465 millert 935: if (options.port == -1) {
936: options.port = a2port(optarg);
937: if (options.port <= 0) {
938: fprintf(stderr, "Bad port '%s'\n",
939: optarg);
940: exit(255);
941: }
1.109 markus 942: }
1.31 markus 943: break;
944: case 'l':
1.465 millert 945: if (options.user == NULL)
946: options.user = optarg;
1.31 markus 947: break;
1.141 stevesk 948:
949: case 'L':
1.324 djm 950: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 951: add_local_forward(&options, &fwd);
952: else {
1.128 fgsch 953: fprintf(stderr,
1.232 djm 954: "Bad local forwarding specification '%s'\n",
1.128 fgsch 955: optarg);
1.257 dtucker 956: exit(255);
1.31 markus 957: }
1.232 djm 958: break;
959:
960: case 'R':
1.464 markus 961: if (parse_forward(&fwd, optarg, 0, 1) ||
962: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 963: add_remote_forward(&options, &fwd);
964: } else {
1.128 fgsch 965: fprintf(stderr,
1.232 djm 966: "Bad remote forwarding specification "
967: "'%s'\n", optarg);
1.257 dtucker 968: exit(255);
1.31 markus 969: }
970: break;
1.108 markus 971:
972: case 'D':
1.324 djm 973: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 974: add_local_forward(&options, &fwd);
1.232 djm 975: } else {
1.322 stevesk 976: fprintf(stderr,
977: "Bad dynamic forwarding specification "
978: "'%s'\n", optarg);
1.257 dtucker 979: exit(255);
1.109 markus 980: }
1.108 markus 981: break;
982:
1.31 markus 983: case 'C':
1.513 dtucker 984: #ifdef WITH_ZLIB
1.31 markus 985: options.compression = 1;
1.513 dtucker 986: #else
987: error("Compression not supported, disabling.");
988: #endif
1.31 markus 989: break;
1.45 markus 990: case 'N':
1.560 djm 991: if (options.session_type != -1 &&
992: options.session_type != SESSION_TYPE_NONE)
993: fatal("Cannot specify -N with -s/SessionType");
994: options.session_type = SESSION_TYPE_NONE;
1.359 djm 995: options.request_tty = REQUEST_TTY_NO;
1.45 markus 996: break;
997: case 'T':
1.359 djm 998: options.request_tty = REQUEST_TTY_NO;
1.45 markus 999: break;
1.31 markus 1000: case 'o':
1.205 markus 1001: line = xstrdup(optarg);
1.408 djm 1002: if (process_config_line(&options, pw,
1003: host ? host : "", host ? host : "", line,
1004: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 1005: exit(255);
1.378 djm 1006: free(line);
1.31 markus 1007: break;
1.85 djm 1008: case 's':
1.560 djm 1009: if (options.session_type != -1 &&
1010: options.session_type != SESSION_TYPE_SUBSYSTEM)
1011: fatal("Cannot specify -s with -N/SessionType");
1012: options.session_type = SESSION_TYPE_SUBSYSTEM;
1.117 markus 1013: break;
1.214 djm 1014: case 'S':
1.431 mmcc 1015: free(options.control_path);
1.214 djm 1016: options.control_path = xstrdup(optarg);
1017: break;
1.117 markus 1018: case 'b':
1019: options.bind_address = optarg;
1.474 djm 1020: break;
1021: case 'B':
1022: options.bind_interface = optarg;
1.85 djm 1023: break;
1.139 markus 1024: case 'F':
1025: config = optarg;
1026: break;
1.31 markus 1027: default:
1028: usage();
1.1 deraadt 1029: }
1.31 markus 1030: }
1031:
1.462 djm 1032: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
1033: opt_terminated = 1;
1034:
1.128 fgsch 1035: ac -= optind;
1036: av += optind;
1037:
1.329 guenther 1038: if (ac > 0 && !host) {
1.465 millert 1039: int tport;
1040: char *tuser;
1041: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
1042: case -1:
1043: usage();
1044: break;
1045: case 0:
1046: if (options.user == NULL) {
1047: options.user = tuser;
1048: tuser = NULL;
1049: }
1050: free(tuser);
1051: if (options.port == -1 && tport != -1)
1052: options.port = tport;
1053: break;
1054: default:
1.128 fgsch 1055: p = xstrdup(*av);
1.188 markus 1056: cp = strrchr(p, '@');
1.465 millert 1057: if (cp != NULL) {
1058: if (cp == p)
1059: usage();
1060: if (options.user == NULL) {
1061: options.user = p;
1062: p = NULL;
1063: }
1064: *cp++ = '\0';
1065: host = xstrdup(cp);
1066: free(p);
1067: } else
1068: host = p;
1069: break;
1070: }
1.462 djm 1071: if (ac > 1 && !opt_terminated) {
1.189 millert 1072: optind = optreset = 1;
1.128 fgsch 1073: goto again;
1074: }
1.189 millert 1075: ac--, av++;
1.128 fgsch 1076: }
1077:
1.31 markus 1078: /* Check that we got a host name. */
1079: if (!host)
1080: usage();
1081:
1.385 djm 1082: host_arg = xstrdup(host);
1083:
1.402 markus 1084: #ifdef WITH_OPENSSL
1.350 djm 1085: OpenSSL_add_all_algorithms();
1.72 markus 1086: ERR_load_crypto_strings();
1.402 markus 1087: #endif
1.31 markus 1088:
1089: /* Initialize the command to execute on remote host. */
1.482 markus 1090: if ((command = sshbuf_new()) == NULL)
1091: fatal("sshbuf_new failed");
1.1 deraadt 1092:
1.33 markus 1093: /*
1094: * Save the command to execute on the remote host in a buffer. There
1095: * is no limit on the length of the command, except by the maximum
1096: * packet size. Also sets the tty flag if there is no command.
1097: */
1.128 fgsch 1098: if (!ac) {
1.31 markus 1099: /* No command specified - execute shell on a tty. */
1.560 djm 1100: if (options.session_type == SESSION_TYPE_SUBSYSTEM) {
1.128 fgsch 1101: fprintf(stderr,
1102: "You must specify a subsystem to invoke.\n");
1.85 djm 1103: usage();
1104: }
1.31 markus 1105: } else {
1.128 fgsch 1106: /* A command has been specified. Store it into the buffer. */
1107: for (i = 0; i < ac; i++) {
1.482 markus 1108: if ((r = sshbuf_putf(command, "%s%s",
1109: i ? " " : "", av[i])) != 0)
1.540 djm 1110: fatal_fr(r, "buffer error");
1.31 markus 1111: }
1112: }
1113:
1.575 djm 1114: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1115:
1.101 markus 1116: /*
1117: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1118: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1119: */
1.375 dtucker 1120: if (use_syslog && logfile != NULL)
1121: fatal("Can't specify both -y and -E");
1.422 dtucker 1122: if (logfile != NULL)
1.375 dtucker 1123: log_redirect_stderr_to(logfile);
1.325 markus 1124: log_init(argv0,
1.468 djm 1125: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1126: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1127: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1128: SYSLOG_FACILITY_USER : options.log_facility,
1129: !use_syslog);
1.375 dtucker 1130:
1131: if (debug_flag)
1.541 dtucker 1132: logit("%s, %s", SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 1133:
1.400 djm 1134: /* Parse the configuration files */
1.496 djm 1135: process_config_files(host_arg, pw, 0, &want_final_pass);
1136: if (want_final_pass)
1137: debug("configuration requests final Match pass");
1.400 djm 1138:
1139: /* Hostname canonicalisation needs a few options filled. */
1140: fill_default_options_for_canonicalization(&options);
1141:
1142: /* If the user has replaced the hostname then take it into use now */
1143: if (options.hostname != NULL) {
1144: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1145: cp = percent_expand(options.hostname,
1146: "h", host, (char *)NULL);
1147: free(host);
1148: host = cp;
1.408 djm 1149: free(options.hostname);
1150: options.hostname = xstrdup(host);
1.400 djm 1151: }
1152:
1.470 djm 1153: /* Don't lowercase addresses, they will be explicitly canonicalised */
1154: if ((was_addr = is_addr(host)) == 0)
1155: lowercase(host);
1156:
1157: /*
1158: * Try to canonicalize if requested by configuration or the
1159: * hostname is an address.
1160: */
1161: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1162: addrs = resolve_canonicalize(&host, options.port);
1163:
1.139 markus 1164: /*
1.401 djm 1165: * If CanonicalizePermittedCNAMEs have been specified but
1166: * other canonicalization did not happen (by not being requested
1167: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1168: * as a result of CNAME following.
1.401 djm 1169: *
1170: * Try to resolve the bare hostname name using the system resolver's
1171: * usual search rules and then apply the CNAME follow rules.
1172: *
1173: * Skip the lookup if a ProxyCommand is being used unless the user
1174: * has specifically requested canonicalisation for this case via
1175: * CanonicalizeHostname=always
1.139 markus 1176: */
1.443 djm 1177: direct = option_clear_or_none(options.proxy_command) &&
1178: options.jump_host == NULL;
1.568 djm 1179: if (addrs == NULL && config_has_permitted_cnames(&options) && (direct ||
1.443 djm 1180: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1181: if ((addrs = resolve_host(host, options.port,
1.493 djm 1182: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1183: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1184: if (direct)
1.403 djm 1185: cleanup_exit(255); /* logged in resolve_host */
1186: } else
1.443 djm 1187: check_follow_cname(direct, &host, cname);
1.400 djm 1188: }
1.139 markus 1189:
1.400 djm 1190: /*
1.408 djm 1191: * If canonicalisation is enabled then re-parse the configuration
1192: * files as new stanzas may match.
1.400 djm 1193: */
1.496 djm 1194: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1195: debug("hostname canonicalisation enabled, "
1196: "will re-parse configuration");
1197: want_final_pass = 1;
1198: }
1199:
1200: if (want_final_pass) {
1201: debug("re-parsing configuration");
1.408 djm 1202: free(options.hostname);
1203: options.hostname = xstrdup(host);
1.496 djm 1204: process_config_files(host_arg, pw, 1, NULL);
1.408 djm 1205: /*
1206: * Address resolution happens early with canonicalisation
1207: * enabled and the port number may have changed since, so
1208: * reset it in address list
1209: */
1210: if (addrs != NULL && options.port > 0)
1211: set_addrinfo_port(addrs, options.port);
1.139 markus 1212: }
1.31 markus 1213:
1214: /* Fill configuration defaults. */
1.543 djm 1215: if (fill_default_options(&options) != 0)
1216: cleanup_exit(255);
1.443 djm 1217:
1.534 dtucker 1218: if (options.user == NULL)
1219: options.user = xstrdup(pw->pw_name);
1220:
1.443 djm 1221: /*
1222: * If ProxyJump option specified, then construct a ProxyCommand now.
1223: */
1224: if (options.jump_host != NULL) {
1225: char port_s[8];
1.534 dtucker 1226: const char *jumpuser = options.jump_user, *sshbin = argv0;
1.520 dtucker 1227: int port = options.port, jumpport = options.jump_port;
1228:
1229: if (port <= 0)
1230: port = default_ssh_port();
1231: if (jumpport <= 0)
1232: jumpport = default_ssh_port();
1.534 dtucker 1233: if (jumpuser == NULL)
1234: jumpuser = options.user;
1235: if (strcmp(options.jump_host, host) == 0 && port == jumpport &&
1236: strcmp(options.user, jumpuser) == 0)
1.520 dtucker 1237: fatal("jumphost loop via %s", options.jump_host);
1.478 djm 1238:
1239: /*
1240: * Try to use SSH indicated by argv[0], but fall back to
1241: * "ssh" if it appears unavailable.
1242: */
1243: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1244: sshbin = "ssh";
1.443 djm 1245:
1246: /* Consistency check */
1247: if (options.proxy_command != NULL)
1248: fatal("inconsistent options: ProxyCommand+ProxyJump");
1249: /* Never use FD passing for ProxyJump */
1250: options.proxy_use_fdpass = 0;
1251: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1252: xasprintf(&options.proxy_command,
1.478 djm 1253: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1254: sshbin,
1.443 djm 1255: /* Optional "-l user" argument if jump_user set */
1256: options.jump_user == NULL ? "" : " -l ",
1257: options.jump_user == NULL ? "" : options.jump_user,
1258: /* Optional "-p port" argument if jump_port set */
1259: options.jump_port <= 0 ? "" : " -p ",
1260: options.jump_port <= 0 ? "" : port_s,
1261: /* Optional additional jump hosts ",..." */
1262: options.jump_extra == NULL ? "" : " -J ",
1263: options.jump_extra == NULL ? "" : options.jump_extra,
1.571 jsg 1264: /* Optional "-F" argument if -F specified */
1.443 djm 1265: config == NULL ? "" : " -F ",
1266: config == NULL ? "" : config,
1267: /* Optional "-v" arguments if -v set */
1268: debug_flag ? " -" : "",
1269: debug_flag, "vvv",
1270: /* Mandatory hostname */
1271: options.jump_host);
1272: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1273: options.proxy_command);
1274: }
1.31 markus 1275:
1.400 djm 1276: if (options.port == 0)
1277: options.port = default_ssh_port();
1.463 djm 1278: channel_set_af(ssh, options.address_family);
1.196 djm 1279:
1.383 djm 1280: /* Tidy and check options */
1281: if (options.host_key_alias != NULL)
1282: lowercase(options.host_key_alias);
1283: if (options.proxy_command != NULL &&
1284: strcmp(options.proxy_command, "-") == 0 &&
1285: options.proxy_use_fdpass)
1286: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.516 markus 1287: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1288: if (options.control_persist && options.control_path != NULL) {
1289: debug("UpdateHostKeys=ask is incompatible with "
1290: "ControlPersist; disabling");
1291: options.update_hostkeys = 0;
1292: } else if (sshbuf_len(command) != 0 ||
1293: options.remote_command != NULL ||
1294: options.request_tty == REQUEST_TTY_NO) {
1295: debug("UpdateHostKeys=ask is incompatible with "
1296: "remote command execution; disabling");
1.517 djm 1297: options.update_hostkeys = 0;
1298: } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1299: /* no point logging anything; user won't see it */
1.516 markus 1300: options.update_hostkeys = 0;
1301: }
1.415 djm 1302: }
1.430 djm 1303: if (options.connection_attempts <= 0)
1304: fatal("Invalid number of ConnectionAttempts");
1305:
1.482 markus 1306: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1307: fatal("Cannot execute command-line and remote command.");
1308:
1309: /* Cannot fork to background if no command. */
1.564 djm 1310: if (options.fork_after_authentication && sshbuf_len(command) == 0 &&
1.562 djm 1311: options.remote_command == NULL &&
1312: options.session_type != SESSION_TYPE_NONE)
1.461 bluhm 1313: fatal("Cannot fork into background without a command "
1314: "to execute.");
1315:
1.31 markus 1316: /* reinit */
1.452 dtucker 1317: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.559 djm 1318: for (j = 0; j < options.num_log_verbose; j++) {
1319: if (strcasecmp(options.log_verbose[j], "none") == 0)
1320: break;
1.539 djm 1321: log_verbose_add(options.log_verbose[j]);
1.559 djm 1322: }
1.370 djm 1323:
1324: if (options.request_tty == REQUEST_TTY_YES ||
1325: options.request_tty == REQUEST_TTY_FORCE)
1326: tty_flag = 1;
1327:
1328: /* Allocate a tty by default if no command specified. */
1.482 markus 1329: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1330: tty_flag = options.request_tty != REQUEST_TTY_NO;
1331:
1332: /* Force no tty */
1.447 markus 1333: if (options.request_tty == REQUEST_TTY_NO ||
1.570 djm 1334: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY) ||
1335: options.session_type == SESSION_TYPE_NONE)
1.370 djm 1336: tty_flag = 0;
1337: /* Do not allocate a tty if stdin is not a tty. */
1.563 djm 1338: if ((!isatty(fileno(stdin)) || options.stdin_null) &&
1.370 djm 1339: options.request_tty != REQUEST_TTY_FORCE) {
1340: if (tty_flag)
1341: logit("Pseudo-terminal will not be allocated because "
1342: "stdin is not a terminal.");
1343: tty_flag = 0;
1344: }
1.343 djm 1345:
1.466 djm 1346: /* Set up strings used to percent_expand() arguments */
1.544 djm 1347: cinfo = xcalloc(1, sizeof(*cinfo));
1.358 djm 1348: if (gethostname(thishost, sizeof(thishost)) == -1)
1349: fatal("gethostname: %s", strerror(errno));
1.544 djm 1350: cinfo->thishost = xstrdup(thishost);
1351: thishost[strcspn(thishost, ".")] = '\0';
1352: cinfo->shorthost = xstrdup(thishost);
1353: xasprintf(&cinfo->portstr, "%d", options.port);
1354: xasprintf(&cinfo->uidstr, "%llu",
1.479 djm 1355: (unsigned long long)pw->pw_uid);
1.544 djm 1356: cinfo->keyalias = xstrdup(options.host_key_alias ?
1357: options.host_key_alias : host_arg);
1358: cinfo->conn_hash_hex = ssh_connection_hash(cinfo->thishost, host,
1359: cinfo->portstr, options.user);
1360: cinfo->host_arg = xstrdup(host_arg);
1361: cinfo->remhost = xstrdup(host);
1362: cinfo->remuser = xstrdup(options.user);
1363: cinfo->homedir = xstrdup(pw->pw_dir);
1364: cinfo->locuser = xstrdup(pw->pw_name);
1.405 djm 1365:
1.466 djm 1366: /*
1367: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1368: * after port-forwarding is set up, so it may pick up any local
1369: * tunnel interface name allocated.
1370: */
1.461 bluhm 1371: if (options.remote_command != NULL) {
1372: debug3("expanding RemoteCommand: %s", options.remote_command);
1373: cp = options.remote_command;
1.527 dtucker 1374: options.remote_command = default_client_percent_expand(cp,
1.544 djm 1375: cinfo);
1.461 bluhm 1376: debug3("expanded RemoteCommand: %s", options.remote_command);
1377: free(cp);
1.482 markus 1378: if ((r = sshbuf_put(command, options.remote_command,
1379: strlen(options.remote_command))) != 0)
1.540 djm 1380: fatal_fr(r, "buffer error");
1.304 dtucker 1381: }
1.31 markus 1382:
1.214 djm 1383: if (options.control_path != NULL) {
1.490 dtucker 1384: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1385: free(options.control_path);
1.528 dtucker 1386: options.control_path = default_client_percent_dollar_expand(cp,
1.544 djm 1387: cinfo);
1.378 djm 1388: free(cp);
1.214 djm 1389: }
1.408 djm 1390:
1.522 dtucker 1391: if (options.identity_agent != NULL) {
1392: p = tilde_expand_filename(options.identity_agent, getuid());
1.544 djm 1393: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1394: free(p);
1395: free(options.identity_agent);
1396: options.identity_agent = cp;
1397: }
1398:
1399: if (options.forward_agent_sock_path != NULL) {
1400: p = tilde_expand_filename(options.forward_agent_sock_path,
1401: getuid());
1.544 djm 1402: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1403: free(p);
1404: free(options.forward_agent_sock_path);
1405: options.forward_agent_sock_path = cp;
1.552 djm 1406: if (stat(options.forward_agent_sock_path, &st) != 0) {
1407: error("Cannot forward agent socket path \"%s\": %s",
1408: options.forward_agent_sock_path, strerror(errno));
1409: if (options.exit_on_forward_failure)
1410: cleanup_exit(255);
1411: }
1.532 dtucker 1412: }
1413:
1.545 djm 1414: if (options.num_system_hostfiles > 0 &&
1415: strcasecmp(options.system_hostfiles[0], "none") == 0) {
1416: if (options.num_system_hostfiles > 1)
1417: fatal("Invalid GlobalKnownHostsFiles: \"none\" "
1418: "appears with other entries");
1419: free(options.system_hostfiles[0]);
1420: options.system_hostfiles[0] = NULL;
1421: options.num_system_hostfiles = 0;
1422: }
1423:
1424: if (options.num_user_hostfiles > 0 &&
1425: strcasecmp(options.user_hostfiles[0], "none") == 0) {
1426: if (options.num_user_hostfiles > 1)
1427: fatal("Invalid UserKnownHostsFiles: \"none\" "
1428: "appears with other entries");
1429: free(options.user_hostfiles[0]);
1430: options.user_hostfiles[0] = NULL;
1431: options.num_user_hostfiles = 0;
1432: }
1.532 dtucker 1433: for (j = 0; j < options.num_user_hostfiles; j++) {
1.545 djm 1434: if (options.user_hostfiles[j] == NULL)
1435: continue;
1436: cp = tilde_expand_filename(options.user_hostfiles[j], getuid());
1437: p = default_client_percent_dollar_expand(cp, cinfo);
1438: if (strcmp(options.user_hostfiles[j], p) != 0)
1439: debug3("expanded UserKnownHostsFile '%s' -> "
1440: "'%s'", options.user_hostfiles[j], p);
1441: free(options.user_hostfiles[j]);
1442: free(cp);
1443: options.user_hostfiles[j] = p;
1.522 dtucker 1444: }
1445:
1.527 dtucker 1446: for (i = 0; i < options.num_local_forwards; i++) {
1447: if (options.local_forwards[i].listen_path != NULL) {
1448: cp = options.local_forwards[i].listen_path;
1449: p = options.local_forwards[i].listen_path =
1.544 djm 1450: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1451: if (strcmp(cp, p) != 0)
1452: debug3("expanded LocalForward listen path "
1453: "'%s' -> '%s'", cp, p);
1454: free(cp);
1455: }
1456: if (options.local_forwards[i].connect_path != NULL) {
1457: cp = options.local_forwards[i].connect_path;
1458: p = options.local_forwards[i].connect_path =
1.544 djm 1459: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1460: if (strcmp(cp, p) != 0)
1461: debug3("expanded LocalForward connect path "
1462: "'%s' -> '%s'", cp, p);
1463: free(cp);
1464: }
1465: }
1466:
1467: for (i = 0; i < options.num_remote_forwards; i++) {
1468: if (options.remote_forwards[i].listen_path != NULL) {
1469: cp = options.remote_forwards[i].listen_path;
1470: p = options.remote_forwards[i].listen_path =
1.544 djm 1471: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1472: if (strcmp(cp, p) != 0)
1473: debug3("expanded RemoteForward listen path "
1474: "'%s' -> '%s'", cp, p);
1475: free(cp);
1476: }
1477: if (options.remote_forwards[i].connect_path != NULL) {
1478: cp = options.remote_forwards[i].connect_path;
1479: p = options.remote_forwards[i].connect_path =
1.544 djm 1480: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1481: if (strcmp(cp, p) != 0)
1482: debug3("expanded RemoteForward connect path "
1483: "'%s' -> '%s'", cp, p);
1484: free(cp);
1485: }
1486: }
1487:
1.408 djm 1488: if (config_test) {
1489: dump_client_config(&options, host);
1490: exit(0);
1.508 djm 1491: }
1492:
1493: /* Expand SecurityKeyProvider if it refers to an environment variable */
1494: if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1495: strlen(options.sk_provider) > 1) {
1496: if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1.518 naddy 1497: debug("Authenticator provider %s did not resolve; "
1.508 djm 1498: "disabling", options.sk_provider);
1499: free(options.sk_provider);
1500: options.sk_provider = NULL;
1501: } else {
1502: debug2("resolved SecurityKeyProvider %s => %s",
1503: options.sk_provider, cp);
1504: free(options.sk_provider);
1505: options.sk_provider = xstrdup(cp);
1506: }
1.408 djm 1507: }
1.405 djm 1508:
1.312 djm 1509: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1510: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1511: if (options.control_path != NULL) {
1512: int sock;
1513: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1514: ssh_packet_set_connection(ssh, sock, sock);
1.499 djm 1515: ssh_packet_set_mux(ssh);
1.447 markus 1516: goto skip_connect;
1517: }
1518: }
1.401 djm 1519:
1520: /*
1521: * If hostname canonicalisation was not enabled, then we may not
1522: * have yet resolved the hostname. Do so now.
1523: */
1524: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1525: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1526: if ((addrs = resolve_host(host, options.port, 1,
1527: cname, sizeof(cname))) == NULL)
1528: cleanup_exit(255); /* resolve_host logs the error */
1529: }
1.214 djm 1530:
1.542 dtucker 1531: if (options.connection_timeout >= INT_MAX/1000)
1532: timeout_ms = INT_MAX;
1533: else
1534: timeout_ms = options.connection_timeout * 1000;
1.303 djm 1535:
1.77 markus 1536: /* Open a connection to the remote host. */
1.511 beck 1537: if (ssh_connect(ssh, host, host_arg, addrs, &hostaddr, options.port,
1.538 kn 1538: options.connection_attempts,
1.488 dtucker 1539: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1540: exit(255);
1.31 markus 1541:
1.391 djm 1542: if (addrs != NULL)
1543: freeaddrinfo(addrs);
1544:
1.499 djm 1545: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1546: options.server_alive_count_max);
1547:
1.303 djm 1548: if (timeout_ms > 0)
1549: debug3("timeout: %d ms remain after connect", timeout_ms);
1550:
1.33 markus 1551: /*
1.485 dtucker 1552: * If we successfully made the connection and we have hostbased auth
1553: * enabled, load the public keys so we can later use the ssh-keysign
1554: * helper to sign challenges.
1.33 markus 1555: */
1.112 markus 1556: sensitive_data.nkeys = 0;
1557: sensitive_data.keys = NULL;
1.457 djm 1558: if (options.hostbased_authentication) {
1.486 dtucker 1559: sensitive_data.nkeys = 10;
1.274 deraadt 1560: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.483 markus 1561: sizeof(struct sshkey));
1562:
1563: /* XXX check errors? */
1.486 dtucker 1564: #define L_PUBKEY(p,o) do { \
1565: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1566: fatal_f("pubkey out of array bounds"); \
1.483 markus 1567: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.576 djm 1568: &(sensitive_data.keys[o]), p, "pubkey"); \
1.572 djm 1569: if (sensitive_data.keys[o] != NULL) \
1570: debug2("hostbased key %d: %s key from \"%s\"", o, \
1571: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.486 dtucker 1572: } while (0)
1573: #define L_CERT(p,o) do { \
1574: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1575: fatal_f("cert out of array bounds"); \
1.576 djm 1576: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), \
1577: &(sensitive_data.keys[o]), p, "cert"); \
1.572 djm 1578: if (sensitive_data.keys[o] != NULL) \
1579: debug2("hostbased key %d: %s cert from \"%s\"", o, \
1580: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.486 dtucker 1581: } while (0)
1.177 markus 1582:
1.485 dtucker 1583: if (options.hostbased_authentication == 1) {
1.486 dtucker 1584: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1585: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1586: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1587: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1588: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1589: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1590: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1591: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1592: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1593: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.173 markus 1594: }
1.367 djm 1595: }
1.31 markus 1596:
1.104 markus 1597: /* load options.identity_files */
1.544 djm 1598: load_public_identity_files(cinfo);
1.439 markus 1599:
1.476 djm 1600: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1601: if (options.identity_agent &&
1602: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1603: if (strcmp(options.identity_agent, "none") == 0) {
1604: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1605: } else {
1.522 dtucker 1606: cp = options.identity_agent;
1.528 dtucker 1607: /* legacy (limited) format */
1608: if (cp[0] == '$' && cp[1] != '{') {
1.494 djm 1609: if (!valid_env_name(cp + 1)) {
1610: fatal("Invalid IdentityAgent "
1611: "environment variable name %s", cp);
1612: }
1613: if ((p = getenv(cp + 1)) == NULL)
1614: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1615: else
1616: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1617: } else {
1618: /* identity_agent specifies a path directly */
1619: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1620: }
1.510 djm 1621: }
1622: }
1623:
1.522 dtucker 1624: if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1.526 djm 1625: cp = options.forward_agent_sock_path;
1.510 djm 1626: if (cp[0] == '$') {
1627: if (!valid_env_name(cp + 1)) {
1628: fatal("Invalid ForwardAgent environment variable name %s", cp);
1629: }
1630: if ((p = getenv(cp + 1)) != NULL)
1.566 dtucker 1631: forward_agent_sock_path = xstrdup(p);
1.510 djm 1632: else
1633: options.forward_agent = 0;
1634: free(cp);
1635: } else {
1636: forward_agent_sock_path = cp;
1.439 markus 1637: }
1638: }
1.104 markus 1639:
1640: /* Expand ~ in known host file names. */
1.361 djm 1641: tilde_expand_paths(options.system_hostfiles,
1642: options.num_system_hostfiles);
1643: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1644:
1.512 dtucker 1645: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1646:
1.316 djm 1647: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1648: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.546 djm 1649: options.port, pw, timeout_ms, cinfo);
1.31 markus 1650:
1.112 markus 1651: /* We no longer need the private host keys. Clear them now. */
1652: if (sensitive_data.nkeys != 0) {
1653: for (i = 0; i < sensitive_data.nkeys; i++) {
1654: if (sensitive_data.keys[i] != NULL) {
1655: /* Destroys contents safely */
1656: debug3("clear hostkey %d", i);
1.483 markus 1657: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1658: sensitive_data.keys[i] = NULL;
1659: }
1660: }
1.378 djm 1661: free(sensitive_data.keys);
1.134 markus 1662: }
1663: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1664: free(options.identity_files[i]);
1665: options.identity_files[i] = NULL;
1.134 markus 1666: if (options.identity_keys[i]) {
1.483 markus 1667: sshkey_free(options.identity_keys[i]);
1.134 markus 1668: options.identity_keys[i] = NULL;
1669: }
1.112 markus 1670: }
1.426 djm 1671: for (i = 0; i < options.num_certificate_files; i++) {
1672: free(options.certificate_files[i]);
1673: options.certificate_files[i] = NULL;
1674: }
1.553 djm 1675:
1676: #ifdef ENABLE_PKCS11
1677: (void)pkcs11_del_provider(options.pkcs11_provider);
1678: #endif
1.31 markus 1679:
1.447 markus 1680: skip_connect:
1.544 djm 1681: exit_status = ssh_session2(ssh, cinfo);
1682: ssh_conn_info_free(cinfo);
1.499 djm 1683: ssh_packet_close(ssh);
1.186 djm 1684:
1.312 djm 1685: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1686: unlink(options.control_path);
1687:
1.353 djm 1688: /* Kill ProxyCommand if it is running. */
1689: ssh_kill_proxy_command();
1.186 djm 1690:
1.45 markus 1691: return exit_status;
1692: }
1693:
1.344 djm 1694: static void
1695: control_persist_detach(void)
1696: {
1697: pid_t pid;
1698:
1.540 djm 1699: debug_f("backgrounding master process");
1.344 djm 1700:
1.473 djm 1701: /*
1702: * master (current process) into the background, and make the
1703: * foreground process a client of the backgrounded master.
1704: */
1.344 djm 1705: switch ((pid = fork())) {
1706: case -1:
1.540 djm 1707: fatal_f("fork: %s", strerror(errno));
1.344 djm 1708: case 0:
1709: /* Child: master process continues mainloop */
1.473 djm 1710: break;
1711: default:
1.531 djm 1712: /* Parent: set up mux client to connect to backgrounded master */
1.540 djm 1713: debug2_f("background process is %ld", (long)pid);
1.563 djm 1714: options.stdin_null = ostdin_null_flag;
1.359 djm 1715: options.request_tty = orequest_tty;
1.344 djm 1716: tty_flag = otty_flag;
1.561 djm 1717: options.session_type = osession_type;
1.473 djm 1718: close(muxserver_sock);
1719: muxserver_sock = -1;
1.351 markus 1720: options.control_master = SSHCTL_MASTER_NO;
1.473 djm 1721: muxclient(options.control_path);
1.344 djm 1722: /* muxclient() doesn't return on success. */
1.473 djm 1723: fatal("Failed to connect to new control master");
1724: }
1.537 djm 1725: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1726: error_f("stdfd_devnull failed");
1.381 djm 1727: daemon(1, 1);
1.362 djm 1728: setproctitle("%s [mux]", options.control_path);
1.344 djm 1729: }
1730:
1731: /* Do fork() after authentication. Used by "ssh -f" */
1732: static void
1733: fork_postauth(void)
1734: {
1735: if (need_controlpersist_detach)
1736: control_persist_detach();
1737: debug("forking to background");
1.564 djm 1738: options.fork_after_authentication = 0;
1.505 deraadt 1739: if (daemon(1, 1) == -1)
1.344 djm 1740: fatal("daemon() failed: %.200s", strerror(errno));
1.537 djm 1741: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1742: error_f("stdfd_devnull failed");
1.344 djm 1743: }
1744:
1.523 djm 1745: static void
1746: forwarding_success(void)
1747: {
1.524 djm 1748: if (forward_confirms_pending == -1)
1749: return;
1750: if (--forward_confirms_pending == 0) {
1.540 djm 1751: debug_f("all expected forwarding replies received");
1.564 djm 1752: if (options.fork_after_authentication)
1.523 djm 1753: fork_postauth();
1.524 djm 1754: } else {
1.540 djm 1755: debug2_f("%d expected forwarding replies remaining",
1756: forward_confirms_pending);
1.523 djm 1757: }
1758: }
1759:
1.315 djm 1760: /* Callback for remote forward global requests */
1761: static void
1.463 djm 1762: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1763: {
1.406 millert 1764: struct Forward *rfwd = (struct Forward *)ctxt;
1.499 djm 1765: u_int port;
1766: int r;
1.315 djm 1767:
1.324 djm 1768: /* XXX verbose() on failure? */
1.404 markus 1769: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1770: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1771: rfwd->listen_path ? rfwd->listen_path :
1772: rfwd->listen_host ? rfwd->listen_host : "",
1773: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1774: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1775: rfwd->connect_host, rfwd->connect_port);
1776: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1777: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1.499 djm 1778: if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1.540 djm 1779: fatal_fr(r, "parse packet");
1.499 djm 1780: if (port > 65535) {
1781: error("Invalid allocated port %u for remote "
1782: "forward to %s:%d", port,
1783: rfwd->connect_host, rfwd->connect_port);
1784: /* Ensure failure processing runs below */
1785: type = SSH2_MSG_REQUEST_FAILURE;
1786: channel_update_permission(ssh,
1787: rfwd->handle, -1);
1788: } else {
1789: rfwd->allocated_port = (int)port;
1790: logit("Allocated port %u for remote "
1791: "forward to %s:%d",
1.569 dtucker 1792: rfwd->allocated_port, rfwd->connect_path ?
1793: rfwd->connect_path : rfwd->connect_host,
1.499 djm 1794: rfwd->connect_port);
1795: channel_update_permission(ssh,
1796: rfwd->handle, rfwd->allocated_port);
1797: }
1.366 markus 1798: } else {
1.480 djm 1799: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1800: }
1.324 djm 1801: }
1.468 djm 1802:
1.315 djm 1803: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1804: if (options.exit_on_forward_failure) {
1805: if (rfwd->listen_path != NULL)
1806: fatal("Error: remote port forwarding failed "
1807: "for listen path %s", rfwd->listen_path);
1808: else
1809: fatal("Error: remote port forwarding failed "
1810: "for listen port %d", rfwd->listen_port);
1811: } else {
1812: if (rfwd->listen_path != NULL)
1813: logit("Warning: remote port forwarding failed "
1814: "for listen path %s", rfwd->listen_path);
1815: else
1816: logit("Warning: remote port forwarding failed "
1817: "for listen port %d", rfwd->listen_port);
1818: }
1.315 djm 1819: }
1.523 djm 1820: forwarding_success();
1.315 djm 1821: }
1822:
1.126 itojun 1823: static void
1.463 djm 1824: client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
1.331 dtucker 1825: {
1826: debug("stdio forwarding: done");
1827: cleanup_exit(0);
1828: }
1829:
1.368 djm 1830: static void
1.463 djm 1831: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1832: {
1833: if (!success)
1834: fatal("stdio forwarding failed");
1835: }
1836:
1837: static void
1.523 djm 1838: ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
1839: {
1840: if (!success) {
1841: error("Tunnel forwarding failed");
1842: if (options.exit_on_forward_failure)
1843: cleanup_exit(255);
1844: }
1845:
1.540 djm 1846: debug_f("tunnel forward established, id=%d", id);
1.523 djm 1847: forwarding_success();
1848: }
1849:
1850: static void
1.463 djm 1851: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1852: {
1853: Channel *c;
1.332 djm 1854: int in, out;
1.331 dtucker 1855:
1.441 dtucker 1856: if (options.stdio_forward_host == NULL)
1.368 djm 1857: return;
1858:
1.540 djm 1859: debug3_f("%s:%d", options.stdio_forward_host,
1.441 dtucker 1860: options.stdio_forward_port);
1.332 djm 1861:
1.505 deraadt 1862: if ((in = dup(STDIN_FILENO)) == -1 ||
1863: (out = dup(STDOUT_FILENO)) == -1)
1.557 djm 1864: fatal_f("dup() in/out failed");
1.463 djm 1865: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.557 djm 1866: options.stdio_forward_port, in, out,
1867: CHANNEL_NONBLOCK_STDIO)) == NULL)
1.540 djm 1868: fatal_f("channel_connect_stdio_fwd failed");
1.463 djm 1869: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1870: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1871: }
1872:
1873: static void
1.551 markus 1874: ssh_init_forward_permissions(struct ssh *ssh, const char *what, char **opens,
1875: u_int num_opens)
1876: {
1877: u_int i;
1878: int port;
1.573 dtucker 1879: char *addr, *arg, *oarg;
1.551 markus 1880: int where = FORWARD_LOCAL;
1881:
1882: channel_clear_permission(ssh, FORWARD_ADM, where);
1883: if (num_opens == 0)
1884: return; /* permit any */
1885:
1886: /* handle keywords: "any" / "none" */
1887: if (num_opens == 1 && strcmp(opens[0], "any") == 0)
1888: return;
1889: if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
1890: channel_disable_admin(ssh, where);
1891: return;
1892: }
1893: /* Otherwise treat it as a list of permitted host:port */
1894: for (i = 0; i < num_opens; i++) {
1895: oarg = arg = xstrdup(opens[i]);
1.573 dtucker 1896: addr = hpdelim(&arg);
1897: if (addr == NULL)
1.551 markus 1898: fatal_f("missing host in %s", what);
1899: addr = cleanhostname(addr);
1900: if (arg == NULL || ((port = permitopen_port(arg)) < 0))
1901: fatal_f("bad port number in %s", what);
1902: /* Send it to channels layer */
1903: channel_add_permission(ssh, FORWARD_ADM,
1904: where, addr, port);
1905: free(oarg);
1906: }
1907: }
1908:
1909: static void
1.466 djm 1910: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1911: {
1.86 markus 1912: int success = 0;
1.70 markus 1913: int i;
1.551 markus 1914:
1915: ssh_init_forward_permissions(ssh, "permitremoteopen",
1916: options.permitted_remote_opens,
1917: options.num_permitted_remote_opens);
1.331 dtucker 1918:
1.524 djm 1919: if (options.exit_on_forward_failure)
1920: forward_confirms_pending = 0; /* track pending requests */
1.70 markus 1921: /* Initiate local TCP/IP port forwardings. */
1922: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1923: debug("Local connections to %.200s:%d forwarded to remote "
1924: "address %.200s:%d",
1.406 millert 1925: (options.local_forwards[i].listen_path != NULL) ?
1926: options.local_forwards[i].listen_path :
1.234 deraadt 1927: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1928: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1929: options.local_forwards[i].listen_host,
1930: options.local_forwards[i].listen_port,
1.406 millert 1931: (options.local_forwards[i].connect_path != NULL) ?
1932: options.local_forwards[i].connect_path :
1.232 djm 1933: options.local_forwards[i].connect_host,
1934: options.local_forwards[i].connect_port);
1.463 djm 1935: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1936: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1937: }
1.283 markus 1938: if (i > 0 && success != i && options.exit_on_forward_failure)
1939: fatal("Could not request local forwarding.");
1.86 markus 1940: if (i > 0 && success == 0)
1941: error("Could not request local forwarding.");
1.70 markus 1942:
1943: /* Initiate remote TCP/IP port forwardings. */
1944: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1945: debug("Remote connections from %.200s:%d forwarded to "
1946: "local address %.200s:%d",
1.406 millert 1947: (options.remote_forwards[i].listen_path != NULL) ?
1948: options.remote_forwards[i].listen_path :
1.248 djm 1949: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1950: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1951: options.remote_forwards[i].listen_port,
1.406 millert 1952: (options.remote_forwards[i].connect_path != NULL) ?
1953: options.remote_forwards[i].connect_path :
1.232 djm 1954: options.remote_forwards[i].connect_host,
1955: options.remote_forwards[i].connect_port);
1.523 djm 1956: if ((options.remote_forwards[i].handle =
1.463 djm 1957: channel_request_remote_forwarding(ssh,
1.523 djm 1958: &options.remote_forwards[i])) >= 0) {
1.463 djm 1959: client_register_global_confirm(
1960: ssh_confirm_remote_forward,
1.366 markus 1961: &options.remote_forwards[i]);
1.523 djm 1962: forward_confirms_pending++;
1963: } else if (options.exit_on_forward_failure)
1964: fatal("Could not request remote forwarding.");
1965: else
1966: logit("Warning: Could not request remote forwarding.");
1.70 markus 1967: }
1.301 djm 1968:
1969: /* Initiate tunnel forwarding. */
1970: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1971: if ((*ifname = client_request_tun_fwd(ssh,
1972: options.tun_open, options.tun_local,
1.523 djm 1973: options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
1974: forward_confirms_pending++;
1975: else if (options.exit_on_forward_failure)
1976: fatal("Could not request tunnel forwarding.");
1977: else
1978: error("Could not request tunnel forwarding.");
1.524 djm 1979: }
1980: if (forward_confirms_pending > 0) {
1.540 djm 1981: debug_f("expecting replies for %d forwards",
1.524 djm 1982: forward_confirms_pending);
1.468 djm 1983: }
1.70 markus 1984: }
1985:
1.126 itojun 1986: static void
1.70 markus 1987: check_agent_present(void)
1988: {
1.412 djm 1989: int r;
1990:
1.70 markus 1991: if (options.forward_agent) {
1.254 djm 1992: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1993: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1994: options.forward_agent = 0;
1.412 djm 1995: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.540 djm 1996: debug_r(r, "ssh_get_authentication_socket");
1.412 djm 1997: }
1.70 markus 1998: }
1999: }
2000:
1.214 djm 2001: static void
1.463 djm 2002: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 2003: {
1.215 djm 2004: extern char **environ;
1.558 djm 2005: const char *display, *term;
1.499 djm 2006: int r, interactive = tty_flag;
1.433 djm 2007: char *proto = NULL, *data = NULL;
1.337 djm 2008:
2009: if (!success)
2010: return; /* No need for error message, channels code sens one */
1.215 djm 2011:
1.248 djm 2012: display = getenv("DISPLAY");
1.417 djm 2013: if (display == NULL && options.forward_x11)
2014: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 2015: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 2016: options.xauth_location, options.forward_x11_trusted,
2017: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 2018: /* Request forwarding with authentication spoofing. */
1.316 djm 2019: debug("Requesting X11 forwarding with authentication "
2020: "spoofing.");
1.463 djm 2021: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 2022: data, 1);
1.463 djm 2023: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 2024: /* XXX exit_on_forward_failure */
1.80 markus 2025: interactive = 1;
1.50 markus 2026: }
2027:
1.70 markus 2028: check_agent_present();
2029: if (options.forward_agent) {
2030: debug("Requesting authentication agent forwarding.");
1.463 djm 2031: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 2032: if ((r = sshpkt_send(ssh)) != 0)
1.540 djm 2033: fatal_fr(r, "send packet");
1.212 djm 2034: }
1.369 dtucker 2035:
2036: /* Tell the packet module whether this is an interactive session. */
1.499 djm 2037: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 2038: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 2039:
1.558 djm 2040: if ((term = lookup_env_in_list("TERM", options.setenv,
2041: options.num_setenv)) == NULL || *term == '\0')
2042: term = getenv("TERM");
1.562 djm 2043: client_session2_setup(ssh, id, tty_flag,
2044: options.session_type == SESSION_TYPE_SUBSYSTEM, term,
1.482 markus 2045: NULL, fileno(stdin), command, environ);
1.45 markus 2046: }
2047:
1.143 markus 2048: /* open new channel for a session */
1.126 itojun 2049: static int
1.463 djm 2050: ssh_session2_open(struct ssh *ssh)
1.45 markus 2051: {
1.118 markus 2052: Channel *c;
2053: int window, packetmax, in, out, err;
1.60 markus 2054:
1.563 djm 2055: if (options.stdin_null) {
1.93 itojun 2056: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 2057: } else {
2058: in = dup(STDIN_FILENO);
2059: }
1.60 markus 2060: out = dup(STDOUT_FILENO);
2061: err = dup(STDERR_FILENO);
1.45 markus 2062:
1.505 deraadt 2063: if (in == -1 || out == -1 || err == -1)
1.62 markus 2064: fatal("dup() in/out/err failed");
1.45 markus 2065:
1.65 markus 2066: window = CHAN_SES_WINDOW_DEFAULT;
2067: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 2068: if (tty_flag) {
2069: window >>= 1;
2070: packetmax >>= 1;
1.45 markus 2071: }
1.463 djm 2072: c = channel_new(ssh,
1.45 markus 2073: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 2074: window, packetmax, CHAN_EXTENDED_WRITE,
1.557 djm 2075: "client-session", CHANNEL_NONBLOCK_STDIO);
1.45 markus 2076:
1.540 djm 2077: debug3_f("channel_new: %d", c->self);
1.106 markus 2078:
1.463 djm 2079: channel_send_open(ssh, c->self);
1.560 djm 2080: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2081: channel_register_open_confirm(ssh, c->self,
1.310 djm 2082: ssh_session2_setup, NULL);
1.106 markus 2083:
1.118 markus 2084: return c->self;
1.106 markus 2085: }
2086:
1.126 itojun 2087: static int
1.544 djm 2088: ssh_session2(struct ssh *ssh, const struct ssh_conn_info *cinfo)
1.106 markus 2089: {
1.537 djm 2090: int r, id = -1;
1.466 djm 2091: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 2092:
2093: /* XXX should be pre-session */
1.368 djm 2094: if (!options.control_persist)
1.463 djm 2095: ssh_init_stdio_forwarding(ssh);
1.466 djm 2096:
2097: ssh_init_forwarding(ssh, &tun_fwd_ifname);
2098:
2099: if (options.local_command != NULL) {
2100: debug3("expanding LocalCommand: %s", options.local_command);
2101: cp = options.local_command;
2102: options.local_command = percent_expand(cp,
1.546 djm 2103: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.466 djm 2104: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2105: (char *)NULL);
2106: debug3("expanded LocalCommand: %s", options.local_command);
2107: free(cp);
2108: }
1.106 markus 2109:
1.344 djm 2110: /* Start listening for multiplex clients */
1.499 djm 2111: if (!ssh_packet_get_mux(ssh))
1.463 djm 2112: muxserver_listen(ssh);
1.344 djm 2113:
1.473 djm 2114: /*
1.368 djm 2115: * If we are in control persist mode and have a working mux listen
2116: * socket, then prepare to background ourselves and have a foreground
1.531 djm 2117: * client attach as a control client.
1.368 djm 2118: * NB. we must save copies of the flags that we override for
1.531 djm 2119: * the backgrounding, since we defer attachment of the client until
1.344 djm 2120: * after the connection is fully established (in particular,
2121: * async rfwd replies have been received for ExitOnForwardFailure).
2122: */
1.473 djm 2123: if (options.control_persist && muxserver_sock != -1) {
1.563 djm 2124: ostdin_null_flag = options.stdin_null;
1.560 djm 2125: osession_type = options.session_type;
1.359 djm 2126: orequest_tty = options.request_tty;
1.344 djm 2127: otty_flag = tty_flag;
1.563 djm 2128: options.stdin_null = 1;
1.560 djm 2129: options.session_type = SESSION_TYPE_NONE;
1.473 djm 2130: tty_flag = 0;
1.564 djm 2131: if (!options.fork_after_authentication &&
1.562 djm 2132: (osession_type != SESSION_TYPE_NONE ||
2133: options.stdio_forward_host != NULL))
1.344 djm 2134: need_controlpersist_detach = 1;
1.564 djm 2135: options.fork_after_authentication = 1;
1.473 djm 2136: }
1.368 djm 2137: /*
2138: * ControlPersist mux listen socket setup failed, attempt the
2139: * stdio forward setup that we skipped earlier.
2140: */
2141: if (options.control_persist && muxserver_sock == -1)
1.463 djm 2142: ssh_init_stdio_forwarding(ssh);
1.344 djm 2143:
1.560 djm 2144: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2145: id = ssh_session2_open(ssh);
1.379 djm 2146: else {
1.499 djm 2147: ssh_packet_set_interactive(ssh,
1.379 djm 2148: options.control_master == SSHCTL_MASTER_NO,
2149: options.ip_qos_interactive, options.ip_qos_bulk);
2150: }
1.314 djm 2151:
2152: /* If we don't expect to open a new session, then disallow it */
1.319 markus 2153: if (options.control_master == SSHCTL_MASTER_NO &&
1.549 djm 2154: (ssh->compat & SSH_NEW_OPENSSH)) {
1.314 djm 2155: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 2156: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2157: (r = sshpkt_put_cstring(ssh,
2158: "no-more-sessions@openssh.com")) != 0 ||
2159: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2160: (r = sshpkt_send(ssh)) != 0)
1.540 djm 2161: fatal_fr(r, "send packet");
1.314 djm 2162: }
1.255 reyk 2163:
2164: /* Execute a local command */
2165: if (options.local_command != NULL &&
2166: options.permit_local_command)
2167: ssh_local_cmd(options.local_command);
1.467 djm 2168:
2169: /*
2170: * stdout is now owned by the session channel; clobber it here
2171: * so future channel closes are propagated to the local fd.
2172: * NB. this can only happen after LocalCommand has completed,
2173: * as it may want to write to stdout.
2174: */
1.537 djm 2175: if (!need_controlpersist_detach && stdfd_devnull(0, 1, 0) == -1)
1.540 djm 2176: error_f("stdfd_devnull failed");
1.301 djm 2177:
1.342 djm 2178: /*
2179: * If requested and we are not interested in replies to remote
2180: * forwarding requests, then let ssh continue in the background.
2181: */
1.564 djm 2182: if (options.fork_after_authentication) {
1.344 djm 2183: if (options.exit_on_forward_failure &&
2184: options.num_remote_forwards > 0) {
2185: debug("deferring postauth fork until remote forward "
2186: "confirmation received");
2187: } else
2188: fork_postauth();
1.318 djm 2189: }
1.31 markus 2190:
1.463 djm 2191: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2192: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2193: }
2194:
1.426 djm 2195: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2196: static void
1.544 djm 2197: load_public_identity_files(const struct ssh_conn_info *cinfo)
1.104 markus 2198: {
1.466 djm 2199: char *filename, *cp;
1.460 markus 2200: struct sshkey *public;
1.426 djm 2201: int i;
2202: u_int n_ids, n_certs;
1.335 djm 2203: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2204: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2205: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2206: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2207: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2208: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2209: #ifdef ENABLE_PKCS11
1.514 djm 2210: struct sshkey **keys = NULL;
2211: char **comments = NULL;
1.333 markus 2212: int nkeys;
1.335 djm 2213: #endif /* PKCS11 */
1.104 markus 2214:
1.426 djm 2215: n_ids = n_certs = 0;
1.398 tedu 2216: memset(identity_files, 0, sizeof(identity_files));
2217: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2218: memset(identity_file_userprovided, 0,
2219: sizeof(identity_file_userprovided));
1.426 djm 2220: memset(certificate_files, 0, sizeof(certificate_files));
2221: memset(certificates, 0, sizeof(certificates));
1.484 djm 2222: memset(certificate_file_userprovided, 0,
2223: sizeof(certificate_file_userprovided));
1.335 djm 2224:
2225: #ifdef ENABLE_PKCS11
1.333 markus 2226: if (options.pkcs11_provider != NULL &&
1.167 markus 2227: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2228: (pkcs11_init(!options.batch_mode) == 0) &&
2229: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1.514 djm 2230: &keys, &comments)) > 0) {
1.333 markus 2231: for (i = 0; i < nkeys; i++) {
1.335 djm 2232: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2233: sshkey_free(keys[i]);
1.514 djm 2234: free(comments[i]);
1.335 djm 2235: continue;
2236: }
2237: identity_keys[n_ids] = keys[i];
1.514 djm 2238: identity_files[n_ids] = comments[i]; /* transferred */
1.335 djm 2239: n_ids++;
1.167 markus 2240: }
1.378 djm 2241: free(keys);
1.514 djm 2242: free(comments);
1.127 markus 2243: }
1.333 markus 2244: #endif /* ENABLE_PKCS11 */
1.335 djm 2245: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2246: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2247: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2248: free(options.identity_files[i]);
1.426 djm 2249: options.identity_files[i] = NULL;
1.335 djm 2250: continue;
2251: }
1.490 dtucker 2252: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.544 djm 2253: filename = default_client_percent_dollar_expand(cp, cinfo);
1.378 djm 2254: free(cp);
1.483 markus 2255: check_load(sshkey_load_public(filename, &public, NULL),
1.576 djm 2256: &public, filename, "pubkey");
1.131 millert 2257: debug("identity file %s type %d", filename,
2258: public ? public->type : -1);
1.378 djm 2259: free(options.identity_files[i]);
1.335 djm 2260: identity_files[n_ids] = filename;
2261: identity_keys[n_ids] = public;
1.484 djm 2262: identity_file_userprovided[n_ids] =
2263: options.identity_file_userprovided[i];
1.335 djm 2264: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2265: continue;
2266:
1.426 djm 2267: /*
2268: * If no certificates have been explicitly listed then try
2269: * to add the default certificate variant too.
2270: */
2271: if (options.num_certificate_files != 0)
2272: continue;
1.335 djm 2273: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2274: check_load(sshkey_load_public(cp, &public, NULL),
1.576 djm 2275: &public, filename, "pubkey");
1.335 djm 2276: debug("identity file %s type %d", cp,
2277: public ? public->type : -1);
2278: if (public == NULL) {
1.378 djm 2279: free(cp);
1.335 djm 2280: continue;
2281: }
1.483 markus 2282: if (!sshkey_is_cert(public)) {
1.540 djm 2283: debug_f("key %s type %s is not a certificate",
2284: cp, sshkey_type(public));
1.483 markus 2285: sshkey_free(public);
1.378 djm 2286: free(cp);
1.335 djm 2287: continue;
2288: }
1.448 djm 2289: /* NB. leave filename pointing to private key */
2290: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2291: identity_keys[n_ids] = public;
1.484 djm 2292: identity_file_userprovided[n_ids] =
2293: options.identity_file_userprovided[i];
1.335 djm 2294: n_ids++;
2295: }
1.426 djm 2296:
2297: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
1.540 djm 2298: fatal_f("too many certificates");
1.426 djm 2299: for (i = 0; i < options.num_certificate_files; i++) {
2300: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2301: getuid());
1.544 djm 2302: filename = default_client_percent_dollar_expand(cp, cinfo);
1.426 djm 2303: free(cp);
2304:
1.483 markus 2305: check_load(sshkey_load_public(filename, &public, NULL),
1.576 djm 2306: &public, filename, "certificate");
1.426 djm 2307: debug("certificate file %s type %d", filename,
2308: public ? public->type : -1);
2309: free(options.certificate_files[i]);
2310: options.certificate_files[i] = NULL;
2311: if (public == NULL) {
2312: free(filename);
2313: continue;
2314: }
1.483 markus 2315: if (!sshkey_is_cert(public)) {
1.540 djm 2316: debug_f("key %s type %s is not a certificate",
2317: filename, sshkey_type(public));
1.483 markus 2318: sshkey_free(public);
1.426 djm 2319: free(filename);
2320: continue;
2321: }
2322: certificate_files[n_certs] = filename;
2323: certificates[n_certs] = public;
1.484 djm 2324: certificate_file_userprovided[n_certs] =
2325: options.certificate_file_userprovided[i];
1.426 djm 2326: ++n_certs;
2327: }
2328:
1.335 djm 2329: options.num_identity_files = n_ids;
2330: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2331: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2332: memcpy(options.identity_file_userprovided,
2333: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2334:
2335: options.num_certificate_files = n_certs;
2336: memcpy(options.certificate_files,
2337: certificate_files, sizeof(certificate_files));
2338: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2339: memcpy(options.certificate_file_userprovided,
2340: certificate_file_userprovided,
2341: sizeof(certificate_file_userprovided));
1.214 djm 2342: }
1.352 djm 2343:
2344: static void
2345: main_sigchld_handler(int sig)
2346: {
2347: int save_errno = errno;
2348: pid_t pid;
2349: int status;
2350:
2351: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2352: (pid == -1 && errno == EINTR))
1.352 djm 2353: ;
2354: errno = save_errno;
2355: }
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