Annotation of src/usr.bin/ssh/ssh.c, Revision 1.574
1.574 ! djm 1: /* $OpenBSD: ssh.c,v 1.573 2022/02/08 08:59:12 dtucker 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: /*
1.483 markus 503: * Check the result of hostkey loading, ignoring some errors and
504: * fatal()ing for others.
505: */
506: static void
507: check_load(int r, const char *path, const char *message)
508: {
509: switch (r) {
510: case 0:
511: break;
512: case SSH_ERR_INTERNAL_ERROR:
513: case SSH_ERR_ALLOC_FAIL:
1.540 djm 514: fatal_r(r, "load %s \"%s\"", message, path);
1.483 markus 515: case SSH_ERR_SYSTEM_ERROR:
516: /* Ignore missing files */
517: if (errno == ENOENT)
518: break;
519: /* FALLTHROUGH */
520: default:
1.540 djm 521: error_r(r, "load %s \"%s\"", message, path);
1.483 markus 522: break;
523: }
524: }
525:
526: /*
1.400 djm 527: * Read per-user configuration file. Ignore the system wide config
528: * file if the user specifies a config file on the command line.
529: */
530: static void
1.496 djm 531: process_config_files(const char *host_name, struct passwd *pw, int final_pass,
532: int *want_final_pass)
1.400 djm 533: {
1.414 deraadt 534: char buf[PATH_MAX];
1.400 djm 535: int r;
536:
537: if (config != NULL) {
538: if (strcasecmp(config, "none") != 0 &&
1.466 djm 539: !read_config_file(config, pw, host, host_name, &options,
1.496 djm 540: SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0),
541: want_final_pass))
1.400 djm 542: fatal("Can't open user config file %.100s: "
543: "%.100s", config, strerror(errno));
544: } else {
545: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
546: _PATH_SSH_USER_CONFFILE);
547: if (r > 0 && (size_t)r < sizeof(buf))
1.466 djm 548: (void)read_config_file(buf, pw, host, host_name,
1.408 djm 549: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
1.496 djm 550: (final_pass ? SSHCONF_FINAL : 0), want_final_pass);
1.400 djm 551:
552: /* Read systemwide configuration file after user config. */
1.408 djm 553: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
1.466 djm 554: host, host_name, &options,
1.496 djm 555: final_pass ? SSHCONF_FINAL : 0, want_final_pass);
1.408 djm 556: }
557: }
558:
559: /* Rewrite the port number in an addrinfo list of addresses */
560: static void
561: set_addrinfo_port(struct addrinfo *addrs, int port)
562: {
563: struct addrinfo *addr;
564:
565: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
566: switch (addr->ai_family) {
567: case AF_INET:
568: ((struct sockaddr_in *)addr->ai_addr)->
569: sin_port = htons(port);
570: break;
571: case AF_INET6:
572: ((struct sockaddr_in6 *)addr->ai_addr)->
573: sin6_port = htons(port);
574: break;
575: }
1.400 djm 576: }
577: }
578:
1.544 djm 579: static void
580: ssh_conn_info_free(struct ssh_conn_info *cinfo)
581: {
582: if (cinfo == NULL)
583: return;
584: free(cinfo->conn_hash_hex);
585: free(cinfo->shorthost);
586: free(cinfo->uidstr);
587: free(cinfo->keyalias);
588: free(cinfo->thishost);
589: free(cinfo->host_arg);
590: free(cinfo->portstr);
591: free(cinfo->remhost);
592: free(cinfo->remuser);
593: free(cinfo->homedir);
594: free(cinfo->locuser);
595: free(cinfo);
596: }
597:
1.400 djm 598: /*
1.32 deraadt 599: * Main program for the ssh client.
600: */
1.2 provos 601: int
602: main(int ac, char **av)
1.1 deraadt 603: {
1.437 djm 604: struct ssh *ssh = NULL;
1.462 djm 605: int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
1.496 djm 606: int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
1.544 djm 607: char *p, *cp, *line, *argv0, *logfile, *host_arg;
608: char cname[NI_MAXHOST], thishost[NI_MAXHOST];
1.31 markus 609: struct stat st;
1.98 markus 610: struct passwd *pw;
1.144 stevesk 611: extern int optind, optreset;
612: extern char *optarg;
1.406 millert 613: struct Forward fwd;
1.385 djm 614: struct addrinfo *addrs = NULL;
1.513 dtucker 615: size_t n, len;
1.532 dtucker 616: u_int j;
1.544 djm 617: struct ssh_conn_info *cinfo = NULL;
1.250 djm 618:
619: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
620: sanitise_stdfd();
1.31 markus 621:
1.33 markus 622: /*
1.346 djm 623: * Discard other fds that are hanging around. These can cause problem
624: * with backgrounded ssh processes started by ControlPersist.
625: */
626: closefrom(STDERR_FILENO + 1);
627:
1.487 dtucker 628: if (getuid() != geteuid())
629: fatal("ssh setuid not supported.");
630: if (getgid() != getegid())
631: fatal("ssh setgid not supported.");
1.184 stevesk 632:
1.107 markus 633: /* Get user data. */
1.490 dtucker 634: pw = getpwuid(getuid());
1.107 markus 635: if (!pw) {
1.490 dtucker 636: logit("No user exists for uid %lu", (u_long)getuid());
1.257 dtucker 637: exit(255);
1.107 markus 638: }
639: /* Take a copy of the returned structure. */
640: pw = pwcopy(pw);
1.31 markus 641:
1.33 markus 642: /*
643: * Set our umask to something reasonable, as some files are created
644: * with the default umask. This will make them world-readable but
645: * writable only by the owner, which is ok for all files for which we
646: * don't set the modes explicitly.
647: */
1.31 markus 648: umask(022);
1.445 djm 649:
650: setlocale(LC_CTYPE, "");
1.31 markus 651:
1.316 djm 652: /*
653: * Initialize option structure to indicate that no values have been
654: * set.
655: */
1.31 markus 656: initialize_options(&options);
657:
1.463 djm 658: /*
659: * Prepare main ssh transport/connection structures
660: */
661: if ((ssh = ssh_alloc_session_state()) == NULL)
662: fatal("Couldn't allocate session state");
663: channel_init_channels(ssh);
664:
1.31 markus 665: /* Parse command-line arguments. */
666: host = NULL;
1.320 djm 667: use_syslog = 0;
1.375 dtucker 668: logfile = NULL;
1.325 markus 669: argv0 = av[0];
1.31 markus 670:
1.266 djm 671: again:
1.316 djm 672: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.574 ! djm 673: "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) { /* HUZdhjruz */
1.31 markus 674: switch (opt) {
1.91 jakob 675: case '1':
1.454 djm 676: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 677: break;
1.47 markus 678: case '2':
1.454 djm 679: /* Ignored */
1.47 markus 680: break;
1.37 markus 681: case '4':
1.196 djm 682: options.address_family = AF_INET;
1.37 markus 683: break;
684: case '6':
1.196 djm 685: options.address_family = AF_INET6;
1.37 markus 686: break;
1.31 markus 687: case 'n':
1.563 djm 688: options.stdin_null = 1;
1.31 markus 689: break;
690: case 'f':
1.564 djm 691: options.fork_after_authentication = 1;
1.563 djm 692: options.stdin_null = 1;
1.31 markus 693: break;
694: case 'x':
695: options.forward_x11 = 0;
696: break;
697: case 'X':
698: options.forward_x11 = 1;
699: break;
1.320 djm 700: case 'y':
701: use_syslog = 1;
702: break;
1.375 dtucker 703: case 'E':
1.422 dtucker 704: logfile = optarg;
1.375 dtucker 705: break;
1.408 djm 706: case 'G':
707: config_test = 1;
708: break;
1.202 markus 709: case 'Y':
710: options.forward_x11 = 1;
711: options.forward_x11_trusted = 1;
712: break;
1.31 markus 713: case 'g':
1.406 millert 714: options.fwd_opts.gateway_ports = 1;
1.31 markus 715: break;
1.229 djm 716: case 'O':
1.441 dtucker 717: if (options.stdio_forward_host != NULL)
1.332 djm 718: fatal("Cannot specify multiplexing "
719: "command with -W");
720: else if (muxclient_command != 0)
721: fatal("Multiplexing command already specified");
1.229 djm 722: if (strcmp(optarg, "check") == 0)
1.312 djm 723: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 724: else if (strcmp(optarg, "forward") == 0)
725: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 726: else if (strcmp(optarg, "exit") == 0)
1.312 djm 727: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 728: else if (strcmp(optarg, "stop") == 0)
729: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 730: else if (strcmp(optarg, "cancel") == 0)
731: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 732: else if (strcmp(optarg, "proxy") == 0)
733: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 734: else
735: fatal("Invalid multiplex command.");
736: break;
1.183 stevesk 737: case 'P': /* deprecated */
1.376 djm 738: break;
1.394 deraadt 739: case 'Q':
1.376 djm 740: cp = NULL;
1.519 dtucker 741: if (strcmp(optarg, "cipher") == 0 ||
742: strcasecmp(optarg, "Ciphers") == 0)
1.393 djm 743: cp = cipher_alg_list('\n', 0);
1.394 deraadt 744: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 745: cp = cipher_alg_list('\n', 1);
1.519 dtucker 746: else if (strcmp(optarg, "mac") == 0 ||
747: strcasecmp(optarg, "MACs") == 0)
1.392 dtucker 748: cp = mac_alg_list('\n');
1.519 dtucker 749: else if (strcmp(optarg, "kex") == 0 ||
750: strcasecmp(optarg, "KexAlgorithms") == 0)
1.392 dtucker 751: cp = kex_alg_list('\n');
1.394 deraadt 752: else if (strcmp(optarg, "key") == 0)
1.451 djm 753: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 754: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 755: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 756: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 757: cp = sshkey_alg_list(0, 1, 0, '\n');
1.519 dtucker 758: else if (strcmp(optarg, "key-sig") == 0 ||
1.547 dtucker 759: strcasecmp(optarg, "PubkeyAcceptedKeyTypes") == 0 || /* deprecated name */
760: strcasecmp(optarg, "PubkeyAcceptedAlgorithms") == 0 ||
1.519 dtucker 761: strcasecmp(optarg, "HostKeyAlgorithms") == 0 ||
1.548 dtucker 762: strcasecmp(optarg, "HostbasedKeyTypes") == 0 || /* deprecated name */
763: strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 0 || /* deprecated name */
764: strcasecmp(optarg, "HostbasedAcceptedAlgorithms") == 0)
1.519 dtucker 765: cp = sshkey_alg_list(0, 0, 1, '\n');
1.491 djm 766: else if (strcmp(optarg, "sig") == 0)
1.492 djm 767: cp = sshkey_alg_list(0, 1, 1, '\n');
1.491 djm 768: else if (strcmp(optarg, "protocol-version") == 0)
1.416 djm 769: cp = xstrdup("2");
1.513 dtucker 770: else if (strcmp(optarg, "compression") == 0) {
771: cp = xstrdup(compression_alg_list(0));
772: len = strlen(cp);
773: for (n = 0; n < len; n++)
774: if (cp[n] == ',')
775: cp[n] = '\n';
776: } else if (strcmp(optarg, "help") == 0) {
1.491 djm 777: cp = xstrdup(
1.513 dtucker 778: "cipher\ncipher-auth\ncompression\nkex\n"
1.519 dtucker 779: "key\nkey-cert\nkey-plain\nkey-sig\nmac\n"
1.491 djm 780: "protocol-version\nsig");
1.416 djm 781: }
1.376 djm 782: if (cp == NULL)
783: fatal("Unsupported query \"%s\"", optarg);
784: printf("%s\n", cp);
785: free(cp);
786: exit(0);
1.31 markus 787: break;
788: case 'a':
789: options.forward_agent = 0;
1.53 markus 790: break;
791: case 'A':
792: options.forward_agent = 1;
1.31 markus 793: break;
794: case 'k':
1.204 dtucker 795: options.gss_deleg_creds = 0;
1.297 djm 796: break;
797: case 'K':
798: options.gss_authentication = 1;
799: options.gss_deleg_creds = 1;
1.31 markus 800: break;
801: case 'i':
1.490 dtucker 802: p = tilde_expand_filename(optarg, getuid());
1.505 deraadt 803: if (stat(p, &st) == -1)
1.128 fgsch 804: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 805: "not accessible: %s.\n", p,
1.231 otto 806: strerror(errno));
1.429 dtucker 807: else
808: add_identity_file(&options, NULL, p, 1);
809: free(p);
1.31 markus 810: break;
1.127 markus 811: case 'I':
1.333 markus 812: #ifdef ENABLE_PKCS11
1.422 dtucker 813: free(options.pkcs11_provider);
1.333 markus 814: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 815: #else
1.333 markus 816: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 817: #endif
1.127 markus 818: break;
1.443 djm 819: case 'J':
1.504 djm 820: if (options.jump_host != NULL) {
821: fatal("Only a single -J option is permitted "
822: "(use commas to separate multiple "
823: "jump hops)");
824: }
1.443 djm 825: if (options.proxy_command != NULL)
826: fatal("Cannot specify -J with ProxyCommand");
827: if (parse_jump(optarg, &options, 1) == -1)
828: fatal("Invalid -J argument");
829: options.proxy_command = xstrdup("none");
830: break;
1.31 markus 831: case 't':
1.359 djm 832: if (options.request_tty == REQUEST_TTY_YES)
833: options.request_tty = REQUEST_TTY_FORCE;
834: else
835: options.request_tty = REQUEST_TTY_YES;
1.31 markus 836: break;
837: case 'v':
1.197 markus 838: if (debug_flag == 0) {
1.66 markus 839: debug_flag = 1;
840: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 841: } else {
1.443 djm 842: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
843: debug_flag++;
1.197 markus 844: options.log_level++;
1.443 djm 845: }
1.197 markus 846: }
1.375 dtucker 847: break;
1.31 markus 848: case 'V':
1.209 markus 849: fprintf(stderr, "%s, %s\n",
1.541 dtucker 850: SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 851: if (opt == 'V')
852: exit(0);
853: break;
1.255 reyk 854: case 'w':
1.256 reyk 855: if (options.tun_open == -1)
856: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 857: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 858: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 859: fprintf(stderr,
860: "Bad tun device '%s'\n", optarg);
1.257 dtucker 861: exit(255);
1.255 reyk 862: }
863: break;
1.331 dtucker 864: case 'W':
1.441 dtucker 865: if (options.stdio_forward_host != NULL)
1.332 djm 866: fatal("stdio forward already specified");
867: if (muxclient_command != 0)
868: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 869: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 870: options.stdio_forward_host = fwd.listen_host;
871: options.stdio_forward_port = fwd.listen_port;
1.378 djm 872: free(fwd.connect_host);
1.331 dtucker 873: } else {
874: fprintf(stderr,
875: "Bad stdio forwarding specification '%s'\n",
876: optarg);
877: exit(255);
878: }
1.359 djm 879: options.request_tty = REQUEST_TTY_NO;
1.560 djm 880: options.session_type = SESSION_TYPE_NONE;
1.331 dtucker 881: break;
1.31 markus 882: case 'q':
883: options.log_level = SYSLOG_LEVEL_QUIET;
884: break;
885: case 'e':
886: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 887: (u_char) optarg[1] >= 64 &&
888: (u_char) optarg[1] < 128)
1.78 markus 889: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 890: else if (strlen(optarg) == 1)
1.78 markus 891: options.escape_char = (u_char) optarg[0];
1.31 markus 892: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 893: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 894: else {
1.128 fgsch 895: fprintf(stderr, "Bad escape character '%s'.\n",
896: optarg);
1.257 dtucker 897: exit(255);
1.31 markus 898: }
899: break;
900: case 'c':
1.506 naddy 901: if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
1.420 djm 902: optarg + 1 : optarg)) {
903: fprintf(stderr, "Unknown cipher type '%s'\n",
904: optarg);
905: exit(255);
1.95 markus 906: }
1.456 djm 907: free(options.ciphers);
908: options.ciphers = xstrdup(optarg);
1.95 markus 909: break;
910: case 'm':
1.422 dtucker 911: if (mac_valid(optarg)) {
912: free(options.macs);
1.95 markus 913: options.macs = xstrdup(optarg);
1.422 dtucker 914: } else {
1.128 fgsch 915: fprintf(stderr, "Unknown mac type '%s'\n",
916: optarg);
1.257 dtucker 917: exit(255);
1.31 markus 918: }
919: break;
1.214 djm 920: case 'M':
1.242 djm 921: if (options.control_master == SSHCTL_MASTER_YES)
922: options.control_master = SSHCTL_MASTER_ASK;
923: else
924: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 925: break;
1.31 markus 926: case 'p':
1.465 millert 927: if (options.port == -1) {
928: options.port = a2port(optarg);
929: if (options.port <= 0) {
930: fprintf(stderr, "Bad port '%s'\n",
931: optarg);
932: exit(255);
933: }
1.109 markus 934: }
1.31 markus 935: break;
936: case 'l':
1.465 millert 937: if (options.user == NULL)
938: options.user = optarg;
1.31 markus 939: break;
1.141 stevesk 940:
941: case 'L':
1.324 djm 942: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 943: add_local_forward(&options, &fwd);
944: else {
1.128 fgsch 945: fprintf(stderr,
1.232 djm 946: "Bad local forwarding specification '%s'\n",
1.128 fgsch 947: optarg);
1.257 dtucker 948: exit(255);
1.31 markus 949: }
1.232 djm 950: break;
951:
952: case 'R':
1.464 markus 953: if (parse_forward(&fwd, optarg, 0, 1) ||
954: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 955: add_remote_forward(&options, &fwd);
956: } else {
1.128 fgsch 957: fprintf(stderr,
1.232 djm 958: "Bad remote forwarding specification "
959: "'%s'\n", optarg);
1.257 dtucker 960: exit(255);
1.31 markus 961: }
962: break;
1.108 markus 963:
964: case 'D':
1.324 djm 965: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 966: add_local_forward(&options, &fwd);
1.232 djm 967: } else {
1.322 stevesk 968: fprintf(stderr,
969: "Bad dynamic forwarding specification "
970: "'%s'\n", optarg);
1.257 dtucker 971: exit(255);
1.109 markus 972: }
1.108 markus 973: break;
974:
1.31 markus 975: case 'C':
1.513 dtucker 976: #ifdef WITH_ZLIB
1.31 markus 977: options.compression = 1;
1.513 dtucker 978: #else
979: error("Compression not supported, disabling.");
980: #endif
1.31 markus 981: break;
1.45 markus 982: case 'N':
1.560 djm 983: if (options.session_type != -1 &&
984: options.session_type != SESSION_TYPE_NONE)
985: fatal("Cannot specify -N with -s/SessionType");
986: options.session_type = SESSION_TYPE_NONE;
1.359 djm 987: options.request_tty = REQUEST_TTY_NO;
1.45 markus 988: break;
989: case 'T':
1.359 djm 990: options.request_tty = REQUEST_TTY_NO;
1.45 markus 991: break;
1.31 markus 992: case 'o':
1.205 markus 993: line = xstrdup(optarg);
1.408 djm 994: if (process_config_line(&options, pw,
995: host ? host : "", host ? host : "", line,
996: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 997: exit(255);
1.378 djm 998: free(line);
1.31 markus 999: break;
1.85 djm 1000: case 's':
1.560 djm 1001: if (options.session_type != -1 &&
1002: options.session_type != SESSION_TYPE_SUBSYSTEM)
1003: fatal("Cannot specify -s with -N/SessionType");
1004: options.session_type = SESSION_TYPE_SUBSYSTEM;
1.117 markus 1005: break;
1.214 djm 1006: case 'S':
1.431 mmcc 1007: free(options.control_path);
1.214 djm 1008: options.control_path = xstrdup(optarg);
1009: break;
1.117 markus 1010: case 'b':
1011: options.bind_address = optarg;
1.474 djm 1012: break;
1013: case 'B':
1014: options.bind_interface = optarg;
1.85 djm 1015: break;
1.139 markus 1016: case 'F':
1017: config = optarg;
1018: break;
1.31 markus 1019: default:
1020: usage();
1.1 deraadt 1021: }
1.31 markus 1022: }
1023:
1.462 djm 1024: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
1025: opt_terminated = 1;
1026:
1.128 fgsch 1027: ac -= optind;
1028: av += optind;
1029:
1.329 guenther 1030: if (ac > 0 && !host) {
1.465 millert 1031: int tport;
1032: char *tuser;
1033: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
1034: case -1:
1035: usage();
1036: break;
1037: case 0:
1038: if (options.user == NULL) {
1039: options.user = tuser;
1040: tuser = NULL;
1041: }
1042: free(tuser);
1043: if (options.port == -1 && tport != -1)
1044: options.port = tport;
1045: break;
1046: default:
1.128 fgsch 1047: p = xstrdup(*av);
1.188 markus 1048: cp = strrchr(p, '@');
1.465 millert 1049: if (cp != NULL) {
1050: if (cp == p)
1051: usage();
1052: if (options.user == NULL) {
1053: options.user = p;
1054: p = NULL;
1055: }
1056: *cp++ = '\0';
1057: host = xstrdup(cp);
1058: free(p);
1059: } else
1060: host = p;
1061: break;
1062: }
1.462 djm 1063: if (ac > 1 && !opt_terminated) {
1.189 millert 1064: optind = optreset = 1;
1.128 fgsch 1065: goto again;
1066: }
1.189 millert 1067: ac--, av++;
1.128 fgsch 1068: }
1069:
1.31 markus 1070: /* Check that we got a host name. */
1071: if (!host)
1072: usage();
1073:
1.385 djm 1074: host_arg = xstrdup(host);
1075:
1.402 markus 1076: #ifdef WITH_OPENSSL
1.350 djm 1077: OpenSSL_add_all_algorithms();
1.72 markus 1078: ERR_load_crypto_strings();
1.402 markus 1079: #endif
1.31 markus 1080:
1081: /* Initialize the command to execute on remote host. */
1.482 markus 1082: if ((command = sshbuf_new()) == NULL)
1083: fatal("sshbuf_new failed");
1.1 deraadt 1084:
1.33 markus 1085: /*
1086: * Save the command to execute on the remote host in a buffer. There
1087: * is no limit on the length of the command, except by the maximum
1088: * packet size. Also sets the tty flag if there is no command.
1089: */
1.128 fgsch 1090: if (!ac) {
1.31 markus 1091: /* No command specified - execute shell on a tty. */
1.560 djm 1092: if (options.session_type == SESSION_TYPE_SUBSYSTEM) {
1.128 fgsch 1093: fprintf(stderr,
1094: "You must specify a subsystem to invoke.\n");
1.85 djm 1095: usage();
1096: }
1.31 markus 1097: } else {
1.128 fgsch 1098: /* A command has been specified. Store it into the buffer. */
1099: for (i = 0; i < ac; i++) {
1.482 markus 1100: if ((r = sshbuf_putf(command, "%s%s",
1101: i ? " " : "", av[i])) != 0)
1.540 djm 1102: fatal_fr(r, "buffer error");
1.31 markus 1103: }
1104: }
1105:
1.101 markus 1106: /*
1107: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1108: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1109: */
1.375 dtucker 1110: if (use_syslog && logfile != NULL)
1111: fatal("Can't specify both -y and -E");
1.422 dtucker 1112: if (logfile != NULL)
1.375 dtucker 1113: log_redirect_stderr_to(logfile);
1.325 markus 1114: log_init(argv0,
1.468 djm 1115: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1116: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1117: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1118: SYSLOG_FACILITY_USER : options.log_facility,
1119: !use_syslog);
1.375 dtucker 1120:
1121: if (debug_flag)
1.541 dtucker 1122: logit("%s, %s", SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 1123:
1.400 djm 1124: /* Parse the configuration files */
1.496 djm 1125: process_config_files(host_arg, pw, 0, &want_final_pass);
1126: if (want_final_pass)
1127: debug("configuration requests final Match pass");
1.400 djm 1128:
1129: /* Hostname canonicalisation needs a few options filled. */
1130: fill_default_options_for_canonicalization(&options);
1131:
1132: /* If the user has replaced the hostname then take it into use now */
1133: if (options.hostname != NULL) {
1134: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1135: cp = percent_expand(options.hostname,
1136: "h", host, (char *)NULL);
1137: free(host);
1138: host = cp;
1.408 djm 1139: free(options.hostname);
1140: options.hostname = xstrdup(host);
1.400 djm 1141: }
1142:
1.470 djm 1143: /* Don't lowercase addresses, they will be explicitly canonicalised */
1144: if ((was_addr = is_addr(host)) == 0)
1145: lowercase(host);
1146:
1147: /*
1148: * Try to canonicalize if requested by configuration or the
1149: * hostname is an address.
1150: */
1151: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1152: addrs = resolve_canonicalize(&host, options.port);
1153:
1.139 markus 1154: /*
1.401 djm 1155: * If CanonicalizePermittedCNAMEs have been specified but
1156: * other canonicalization did not happen (by not being requested
1157: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1158: * as a result of CNAME following.
1.401 djm 1159: *
1160: * Try to resolve the bare hostname name using the system resolver's
1161: * usual search rules and then apply the CNAME follow rules.
1162: *
1163: * Skip the lookup if a ProxyCommand is being used unless the user
1164: * has specifically requested canonicalisation for this case via
1165: * CanonicalizeHostname=always
1.139 markus 1166: */
1.443 djm 1167: direct = option_clear_or_none(options.proxy_command) &&
1168: options.jump_host == NULL;
1.568 djm 1169: if (addrs == NULL && config_has_permitted_cnames(&options) && (direct ||
1.443 djm 1170: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1171: if ((addrs = resolve_host(host, options.port,
1.493 djm 1172: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1173: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1174: if (direct)
1.403 djm 1175: cleanup_exit(255); /* logged in resolve_host */
1176: } else
1.443 djm 1177: check_follow_cname(direct, &host, cname);
1.400 djm 1178: }
1.139 markus 1179:
1.400 djm 1180: /*
1.408 djm 1181: * If canonicalisation is enabled then re-parse the configuration
1182: * files as new stanzas may match.
1.400 djm 1183: */
1.496 djm 1184: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1185: debug("hostname canonicalisation enabled, "
1186: "will re-parse configuration");
1187: want_final_pass = 1;
1188: }
1189:
1190: if (want_final_pass) {
1191: debug("re-parsing configuration");
1.408 djm 1192: free(options.hostname);
1193: options.hostname = xstrdup(host);
1.496 djm 1194: process_config_files(host_arg, pw, 1, NULL);
1.408 djm 1195: /*
1196: * Address resolution happens early with canonicalisation
1197: * enabled and the port number may have changed since, so
1198: * reset it in address list
1199: */
1200: if (addrs != NULL && options.port > 0)
1201: set_addrinfo_port(addrs, options.port);
1.139 markus 1202: }
1.31 markus 1203:
1204: /* Fill configuration defaults. */
1.543 djm 1205: if (fill_default_options(&options) != 0)
1206: cleanup_exit(255);
1.443 djm 1207:
1.534 dtucker 1208: if (options.user == NULL)
1209: options.user = xstrdup(pw->pw_name);
1210:
1.443 djm 1211: /*
1212: * If ProxyJump option specified, then construct a ProxyCommand now.
1213: */
1214: if (options.jump_host != NULL) {
1215: char port_s[8];
1.534 dtucker 1216: const char *jumpuser = options.jump_user, *sshbin = argv0;
1.520 dtucker 1217: int port = options.port, jumpport = options.jump_port;
1218:
1219: if (port <= 0)
1220: port = default_ssh_port();
1221: if (jumpport <= 0)
1222: jumpport = default_ssh_port();
1.534 dtucker 1223: if (jumpuser == NULL)
1224: jumpuser = options.user;
1225: if (strcmp(options.jump_host, host) == 0 && port == jumpport &&
1226: strcmp(options.user, jumpuser) == 0)
1.520 dtucker 1227: fatal("jumphost loop via %s", options.jump_host);
1.478 djm 1228:
1229: /*
1230: * Try to use SSH indicated by argv[0], but fall back to
1231: * "ssh" if it appears unavailable.
1232: */
1233: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1234: sshbin = "ssh";
1.443 djm 1235:
1236: /* Consistency check */
1237: if (options.proxy_command != NULL)
1238: fatal("inconsistent options: ProxyCommand+ProxyJump");
1239: /* Never use FD passing for ProxyJump */
1240: options.proxy_use_fdpass = 0;
1241: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1242: xasprintf(&options.proxy_command,
1.478 djm 1243: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1244: sshbin,
1.443 djm 1245: /* Optional "-l user" argument if jump_user set */
1246: options.jump_user == NULL ? "" : " -l ",
1247: options.jump_user == NULL ? "" : options.jump_user,
1248: /* Optional "-p port" argument if jump_port set */
1249: options.jump_port <= 0 ? "" : " -p ",
1250: options.jump_port <= 0 ? "" : port_s,
1251: /* Optional additional jump hosts ",..." */
1252: options.jump_extra == NULL ? "" : " -J ",
1253: options.jump_extra == NULL ? "" : options.jump_extra,
1.571 jsg 1254: /* Optional "-F" argument if -F specified */
1.443 djm 1255: config == NULL ? "" : " -F ",
1256: config == NULL ? "" : config,
1257: /* Optional "-v" arguments if -v set */
1258: debug_flag ? " -" : "",
1259: debug_flag, "vvv",
1260: /* Mandatory hostname */
1261: options.jump_host);
1262: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1263: options.proxy_command);
1264: }
1.31 markus 1265:
1.400 djm 1266: if (options.port == 0)
1267: options.port = default_ssh_port();
1.463 djm 1268: channel_set_af(ssh, options.address_family);
1.196 djm 1269:
1.383 djm 1270: /* Tidy and check options */
1271: if (options.host_key_alias != NULL)
1272: lowercase(options.host_key_alias);
1273: if (options.proxy_command != NULL &&
1274: strcmp(options.proxy_command, "-") == 0 &&
1275: options.proxy_use_fdpass)
1276: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.516 markus 1277: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1278: if (options.control_persist && options.control_path != NULL) {
1279: debug("UpdateHostKeys=ask is incompatible with "
1280: "ControlPersist; disabling");
1281: options.update_hostkeys = 0;
1282: } else if (sshbuf_len(command) != 0 ||
1283: options.remote_command != NULL ||
1284: options.request_tty == REQUEST_TTY_NO) {
1285: debug("UpdateHostKeys=ask is incompatible with "
1286: "remote command execution; disabling");
1.517 djm 1287: options.update_hostkeys = 0;
1288: } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1289: /* no point logging anything; user won't see it */
1.516 markus 1290: options.update_hostkeys = 0;
1291: }
1.415 djm 1292: }
1.430 djm 1293: if (options.connection_attempts <= 0)
1294: fatal("Invalid number of ConnectionAttempts");
1295:
1.482 markus 1296: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1297: fatal("Cannot execute command-line and remote command.");
1298:
1299: /* Cannot fork to background if no command. */
1.564 djm 1300: if (options.fork_after_authentication && sshbuf_len(command) == 0 &&
1.562 djm 1301: options.remote_command == NULL &&
1302: options.session_type != SESSION_TYPE_NONE)
1.461 bluhm 1303: fatal("Cannot fork into background without a command "
1304: "to execute.");
1305:
1.31 markus 1306: /* reinit */
1.452 dtucker 1307: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.559 djm 1308: for (j = 0; j < options.num_log_verbose; j++) {
1309: if (strcasecmp(options.log_verbose[j], "none") == 0)
1310: break;
1.539 djm 1311: log_verbose_add(options.log_verbose[j]);
1.559 djm 1312: }
1.370 djm 1313:
1314: if (options.request_tty == REQUEST_TTY_YES ||
1315: options.request_tty == REQUEST_TTY_FORCE)
1316: tty_flag = 1;
1317:
1318: /* Allocate a tty by default if no command specified. */
1.482 markus 1319: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1320: tty_flag = options.request_tty != REQUEST_TTY_NO;
1321:
1322: /* Force no tty */
1.447 markus 1323: if (options.request_tty == REQUEST_TTY_NO ||
1.570 djm 1324: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY) ||
1325: options.session_type == SESSION_TYPE_NONE)
1.370 djm 1326: tty_flag = 0;
1327: /* Do not allocate a tty if stdin is not a tty. */
1.563 djm 1328: if ((!isatty(fileno(stdin)) || options.stdin_null) &&
1.370 djm 1329: options.request_tty != REQUEST_TTY_FORCE) {
1330: if (tty_flag)
1331: logit("Pseudo-terminal will not be allocated because "
1332: "stdin is not a terminal.");
1333: tty_flag = 0;
1334: }
1.343 djm 1335:
1.466 djm 1336: /* Set up strings used to percent_expand() arguments */
1.544 djm 1337: cinfo = xcalloc(1, sizeof(*cinfo));
1.358 djm 1338: if (gethostname(thishost, sizeof(thishost)) == -1)
1339: fatal("gethostname: %s", strerror(errno));
1.544 djm 1340: cinfo->thishost = xstrdup(thishost);
1341: thishost[strcspn(thishost, ".")] = '\0';
1342: cinfo->shorthost = xstrdup(thishost);
1343: xasprintf(&cinfo->portstr, "%d", options.port);
1344: xasprintf(&cinfo->uidstr, "%llu",
1.479 djm 1345: (unsigned long long)pw->pw_uid);
1.544 djm 1346: cinfo->keyalias = xstrdup(options.host_key_alias ?
1347: options.host_key_alias : host_arg);
1348: cinfo->conn_hash_hex = ssh_connection_hash(cinfo->thishost, host,
1349: cinfo->portstr, options.user);
1350: cinfo->host_arg = xstrdup(host_arg);
1351: cinfo->remhost = xstrdup(host);
1352: cinfo->remuser = xstrdup(options.user);
1353: cinfo->homedir = xstrdup(pw->pw_dir);
1354: cinfo->locuser = xstrdup(pw->pw_name);
1.405 djm 1355:
1.466 djm 1356: /*
1357: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1358: * after port-forwarding is set up, so it may pick up any local
1359: * tunnel interface name allocated.
1360: */
1.461 bluhm 1361: if (options.remote_command != NULL) {
1362: debug3("expanding RemoteCommand: %s", options.remote_command);
1363: cp = options.remote_command;
1.527 dtucker 1364: options.remote_command = default_client_percent_expand(cp,
1.544 djm 1365: cinfo);
1.461 bluhm 1366: debug3("expanded RemoteCommand: %s", options.remote_command);
1367: free(cp);
1.482 markus 1368: if ((r = sshbuf_put(command, options.remote_command,
1369: strlen(options.remote_command))) != 0)
1.540 djm 1370: fatal_fr(r, "buffer error");
1.304 dtucker 1371: }
1.31 markus 1372:
1.214 djm 1373: if (options.control_path != NULL) {
1.490 dtucker 1374: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1375: free(options.control_path);
1.528 dtucker 1376: options.control_path = default_client_percent_dollar_expand(cp,
1.544 djm 1377: cinfo);
1.378 djm 1378: free(cp);
1.214 djm 1379: }
1.408 djm 1380:
1.522 dtucker 1381: if (options.identity_agent != NULL) {
1382: p = tilde_expand_filename(options.identity_agent, getuid());
1.544 djm 1383: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1384: free(p);
1385: free(options.identity_agent);
1386: options.identity_agent = cp;
1387: }
1388:
1389: if (options.forward_agent_sock_path != NULL) {
1390: p = tilde_expand_filename(options.forward_agent_sock_path,
1391: getuid());
1.544 djm 1392: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1393: free(p);
1394: free(options.forward_agent_sock_path);
1395: options.forward_agent_sock_path = cp;
1.552 djm 1396: if (stat(options.forward_agent_sock_path, &st) != 0) {
1397: error("Cannot forward agent socket path \"%s\": %s",
1398: options.forward_agent_sock_path, strerror(errno));
1399: if (options.exit_on_forward_failure)
1400: cleanup_exit(255);
1401: }
1.532 dtucker 1402: }
1403:
1.545 djm 1404: if (options.num_system_hostfiles > 0 &&
1405: strcasecmp(options.system_hostfiles[0], "none") == 0) {
1406: if (options.num_system_hostfiles > 1)
1407: fatal("Invalid GlobalKnownHostsFiles: \"none\" "
1408: "appears with other entries");
1409: free(options.system_hostfiles[0]);
1410: options.system_hostfiles[0] = NULL;
1411: options.num_system_hostfiles = 0;
1412: }
1413:
1414: if (options.num_user_hostfiles > 0 &&
1415: strcasecmp(options.user_hostfiles[0], "none") == 0) {
1416: if (options.num_user_hostfiles > 1)
1417: fatal("Invalid UserKnownHostsFiles: \"none\" "
1418: "appears with other entries");
1419: free(options.user_hostfiles[0]);
1420: options.user_hostfiles[0] = NULL;
1421: options.num_user_hostfiles = 0;
1422: }
1.532 dtucker 1423: for (j = 0; j < options.num_user_hostfiles; j++) {
1.545 djm 1424: if (options.user_hostfiles[j] == NULL)
1425: continue;
1426: cp = tilde_expand_filename(options.user_hostfiles[j], getuid());
1427: p = default_client_percent_dollar_expand(cp, cinfo);
1428: if (strcmp(options.user_hostfiles[j], p) != 0)
1429: debug3("expanded UserKnownHostsFile '%s' -> "
1430: "'%s'", options.user_hostfiles[j], p);
1431: free(options.user_hostfiles[j]);
1432: free(cp);
1433: options.user_hostfiles[j] = p;
1.522 dtucker 1434: }
1435:
1.527 dtucker 1436: for (i = 0; i < options.num_local_forwards; i++) {
1437: if (options.local_forwards[i].listen_path != NULL) {
1438: cp = options.local_forwards[i].listen_path;
1439: p = options.local_forwards[i].listen_path =
1.544 djm 1440: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1441: if (strcmp(cp, p) != 0)
1442: debug3("expanded LocalForward listen path "
1443: "'%s' -> '%s'", cp, p);
1444: free(cp);
1445: }
1446: if (options.local_forwards[i].connect_path != NULL) {
1447: cp = options.local_forwards[i].connect_path;
1448: p = options.local_forwards[i].connect_path =
1.544 djm 1449: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1450: if (strcmp(cp, p) != 0)
1451: debug3("expanded LocalForward connect path "
1452: "'%s' -> '%s'", cp, p);
1453: free(cp);
1454: }
1455: }
1456:
1457: for (i = 0; i < options.num_remote_forwards; i++) {
1458: if (options.remote_forwards[i].listen_path != NULL) {
1459: cp = options.remote_forwards[i].listen_path;
1460: p = options.remote_forwards[i].listen_path =
1.544 djm 1461: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1462: if (strcmp(cp, p) != 0)
1463: debug3("expanded RemoteForward listen path "
1464: "'%s' -> '%s'", cp, p);
1465: free(cp);
1466: }
1467: if (options.remote_forwards[i].connect_path != NULL) {
1468: cp = options.remote_forwards[i].connect_path;
1469: p = options.remote_forwards[i].connect_path =
1.544 djm 1470: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1471: if (strcmp(cp, p) != 0)
1472: debug3("expanded RemoteForward connect path "
1473: "'%s' -> '%s'", cp, p);
1474: free(cp);
1475: }
1476: }
1477:
1.408 djm 1478: if (config_test) {
1479: dump_client_config(&options, host);
1480: exit(0);
1.508 djm 1481: }
1482:
1483: /* Expand SecurityKeyProvider if it refers to an environment variable */
1484: if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1485: strlen(options.sk_provider) > 1) {
1486: if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1.518 naddy 1487: debug("Authenticator provider %s did not resolve; "
1.508 djm 1488: "disabling", options.sk_provider);
1489: free(options.sk_provider);
1490: options.sk_provider = NULL;
1491: } else {
1492: debug2("resolved SecurityKeyProvider %s => %s",
1493: options.sk_provider, cp);
1494: free(options.sk_provider);
1495: options.sk_provider = xstrdup(cp);
1496: }
1.408 djm 1497: }
1.405 djm 1498:
1.312 djm 1499: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1500: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1501: if (options.control_path != NULL) {
1502: int sock;
1503: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1504: ssh_packet_set_connection(ssh, sock, sock);
1.499 djm 1505: ssh_packet_set_mux(ssh);
1.447 markus 1506: goto skip_connect;
1507: }
1508: }
1.401 djm 1509:
1510: /*
1511: * If hostname canonicalisation was not enabled, then we may not
1512: * have yet resolved the hostname. Do so now.
1513: */
1514: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1515: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1516: if ((addrs = resolve_host(host, options.port, 1,
1517: cname, sizeof(cname))) == NULL)
1518: cleanup_exit(255); /* resolve_host logs the error */
1519: }
1.214 djm 1520:
1.542 dtucker 1521: if (options.connection_timeout >= INT_MAX/1000)
1522: timeout_ms = INT_MAX;
1523: else
1524: timeout_ms = options.connection_timeout * 1000;
1.303 djm 1525:
1.77 markus 1526: /* Open a connection to the remote host. */
1.511 beck 1527: if (ssh_connect(ssh, host, host_arg, addrs, &hostaddr, options.port,
1.538 kn 1528: options.connection_attempts,
1.488 dtucker 1529: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1530: exit(255);
1.31 markus 1531:
1.391 djm 1532: if (addrs != NULL)
1533: freeaddrinfo(addrs);
1534:
1.499 djm 1535: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1536: options.server_alive_count_max);
1537:
1.303 djm 1538: if (timeout_ms > 0)
1539: debug3("timeout: %d ms remain after connect", timeout_ms);
1540:
1.33 markus 1541: /*
1.485 dtucker 1542: * If we successfully made the connection and we have hostbased auth
1543: * enabled, load the public keys so we can later use the ssh-keysign
1544: * helper to sign challenges.
1.33 markus 1545: */
1.112 markus 1546: sensitive_data.nkeys = 0;
1547: sensitive_data.keys = NULL;
1.457 djm 1548: if (options.hostbased_authentication) {
1.486 dtucker 1549: sensitive_data.nkeys = 10;
1.274 deraadt 1550: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.483 markus 1551: sizeof(struct sshkey));
1552:
1553: /* XXX check errors? */
1.486 dtucker 1554: #define L_PUBKEY(p,o) do { \
1555: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1556: fatal_f("pubkey out of array bounds"); \
1.483 markus 1557: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.486 dtucker 1558: p, "pubkey"); \
1.572 djm 1559: if (sensitive_data.keys[o] != NULL) \
1560: debug2("hostbased key %d: %s key from \"%s\"", o, \
1561: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.486 dtucker 1562: } while (0)
1563: #define L_CERT(p,o) do { \
1564: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1565: fatal_f("cert out of array bounds"); \
1.486 dtucker 1566: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), p, "cert"); \
1.572 djm 1567: if (sensitive_data.keys[o] != NULL) \
1568: debug2("hostbased key %d: %s cert from \"%s\"", o, \
1569: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.486 dtucker 1570: } while (0)
1.177 markus 1571:
1.485 dtucker 1572: if (options.hostbased_authentication == 1) {
1.486 dtucker 1573: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1574: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1575: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1576: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1577: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1578: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1579: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1580: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1581: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1582: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.173 markus 1583: }
1.367 djm 1584: }
1.31 markus 1585:
1.104 markus 1586: /* load options.identity_files */
1.544 djm 1587: load_public_identity_files(cinfo);
1.439 markus 1588:
1.476 djm 1589: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1590: if (options.identity_agent &&
1591: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1592: if (strcmp(options.identity_agent, "none") == 0) {
1593: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1594: } else {
1.522 dtucker 1595: cp = options.identity_agent;
1.528 dtucker 1596: /* legacy (limited) format */
1597: if (cp[0] == '$' && cp[1] != '{') {
1.494 djm 1598: if (!valid_env_name(cp + 1)) {
1599: fatal("Invalid IdentityAgent "
1600: "environment variable name %s", cp);
1601: }
1602: if ((p = getenv(cp + 1)) == NULL)
1603: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1604: else
1605: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1606: } else {
1607: /* identity_agent specifies a path directly */
1608: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1609: }
1.510 djm 1610: }
1611: }
1612:
1.522 dtucker 1613: if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1.526 djm 1614: cp = options.forward_agent_sock_path;
1.510 djm 1615: if (cp[0] == '$') {
1616: if (!valid_env_name(cp + 1)) {
1617: fatal("Invalid ForwardAgent environment variable name %s", cp);
1618: }
1619: if ((p = getenv(cp + 1)) != NULL)
1.566 dtucker 1620: forward_agent_sock_path = xstrdup(p);
1.510 djm 1621: else
1622: options.forward_agent = 0;
1623: free(cp);
1624: } else {
1625: forward_agent_sock_path = cp;
1.439 markus 1626: }
1627: }
1.104 markus 1628:
1629: /* Expand ~ in known host file names. */
1.361 djm 1630: tilde_expand_paths(options.system_hostfiles,
1631: options.num_system_hostfiles);
1632: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1633:
1.512 dtucker 1634: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1635: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1636:
1.316 djm 1637: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1638: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.546 djm 1639: options.port, pw, timeout_ms, cinfo);
1.31 markus 1640:
1.112 markus 1641: /* We no longer need the private host keys. Clear them now. */
1642: if (sensitive_data.nkeys != 0) {
1643: for (i = 0; i < sensitive_data.nkeys; i++) {
1644: if (sensitive_data.keys[i] != NULL) {
1645: /* Destroys contents safely */
1646: debug3("clear hostkey %d", i);
1.483 markus 1647: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1648: sensitive_data.keys[i] = NULL;
1649: }
1650: }
1.378 djm 1651: free(sensitive_data.keys);
1.134 markus 1652: }
1653: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1654: free(options.identity_files[i]);
1655: options.identity_files[i] = NULL;
1.134 markus 1656: if (options.identity_keys[i]) {
1.483 markus 1657: sshkey_free(options.identity_keys[i]);
1.134 markus 1658: options.identity_keys[i] = NULL;
1659: }
1.112 markus 1660: }
1.426 djm 1661: for (i = 0; i < options.num_certificate_files; i++) {
1662: free(options.certificate_files[i]);
1663: options.certificate_files[i] = NULL;
1664: }
1.553 djm 1665:
1666: #ifdef ENABLE_PKCS11
1667: (void)pkcs11_del_provider(options.pkcs11_provider);
1668: #endif
1.31 markus 1669:
1.447 markus 1670: skip_connect:
1.544 djm 1671: exit_status = ssh_session2(ssh, cinfo);
1672: ssh_conn_info_free(cinfo);
1.499 djm 1673: ssh_packet_close(ssh);
1.186 djm 1674:
1.312 djm 1675: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1676: unlink(options.control_path);
1677:
1.353 djm 1678: /* Kill ProxyCommand if it is running. */
1679: ssh_kill_proxy_command();
1.186 djm 1680:
1.45 markus 1681: return exit_status;
1682: }
1683:
1.344 djm 1684: static void
1685: control_persist_detach(void)
1686: {
1687: pid_t pid;
1688:
1.540 djm 1689: debug_f("backgrounding master process");
1.344 djm 1690:
1.473 djm 1691: /*
1692: * master (current process) into the background, and make the
1693: * foreground process a client of the backgrounded master.
1694: */
1.344 djm 1695: switch ((pid = fork())) {
1696: case -1:
1.540 djm 1697: fatal_f("fork: %s", strerror(errno));
1.344 djm 1698: case 0:
1699: /* Child: master process continues mainloop */
1.473 djm 1700: break;
1701: default:
1.531 djm 1702: /* Parent: set up mux client to connect to backgrounded master */
1.540 djm 1703: debug2_f("background process is %ld", (long)pid);
1.563 djm 1704: options.stdin_null = ostdin_null_flag;
1.359 djm 1705: options.request_tty = orequest_tty;
1.344 djm 1706: tty_flag = otty_flag;
1.561 djm 1707: options.session_type = osession_type;
1.473 djm 1708: close(muxserver_sock);
1709: muxserver_sock = -1;
1.351 markus 1710: options.control_master = SSHCTL_MASTER_NO;
1.473 djm 1711: muxclient(options.control_path);
1.344 djm 1712: /* muxclient() doesn't return on success. */
1.473 djm 1713: fatal("Failed to connect to new control master");
1714: }
1.537 djm 1715: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1716: error_f("stdfd_devnull failed");
1.381 djm 1717: daemon(1, 1);
1.362 djm 1718: setproctitle("%s [mux]", options.control_path);
1.344 djm 1719: }
1720:
1721: /* Do fork() after authentication. Used by "ssh -f" */
1722: static void
1723: fork_postauth(void)
1724: {
1725: if (need_controlpersist_detach)
1726: control_persist_detach();
1727: debug("forking to background");
1.564 djm 1728: options.fork_after_authentication = 0;
1.505 deraadt 1729: if (daemon(1, 1) == -1)
1.344 djm 1730: fatal("daemon() failed: %.200s", strerror(errno));
1.537 djm 1731: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1732: error_f("stdfd_devnull failed");
1.344 djm 1733: }
1734:
1.523 djm 1735: static void
1736: forwarding_success(void)
1737: {
1.524 djm 1738: if (forward_confirms_pending == -1)
1739: return;
1740: if (--forward_confirms_pending == 0) {
1.540 djm 1741: debug_f("all expected forwarding replies received");
1.564 djm 1742: if (options.fork_after_authentication)
1.523 djm 1743: fork_postauth();
1.524 djm 1744: } else {
1.540 djm 1745: debug2_f("%d expected forwarding replies remaining",
1746: forward_confirms_pending);
1.523 djm 1747: }
1748: }
1749:
1.315 djm 1750: /* Callback for remote forward global requests */
1751: static void
1.463 djm 1752: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1753: {
1.406 millert 1754: struct Forward *rfwd = (struct Forward *)ctxt;
1.499 djm 1755: u_int port;
1756: int r;
1.315 djm 1757:
1.324 djm 1758: /* XXX verbose() on failure? */
1.404 markus 1759: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1760: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1761: rfwd->listen_path ? rfwd->listen_path :
1762: rfwd->listen_host ? rfwd->listen_host : "",
1763: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1764: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1765: rfwd->connect_host, rfwd->connect_port);
1766: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1767: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1.499 djm 1768: if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1.540 djm 1769: fatal_fr(r, "parse packet");
1.499 djm 1770: if (port > 65535) {
1771: error("Invalid allocated port %u for remote "
1772: "forward to %s:%d", port,
1773: rfwd->connect_host, rfwd->connect_port);
1774: /* Ensure failure processing runs below */
1775: type = SSH2_MSG_REQUEST_FAILURE;
1776: channel_update_permission(ssh,
1777: rfwd->handle, -1);
1778: } else {
1779: rfwd->allocated_port = (int)port;
1780: logit("Allocated port %u for remote "
1781: "forward to %s:%d",
1.569 dtucker 1782: rfwd->allocated_port, rfwd->connect_path ?
1783: rfwd->connect_path : rfwd->connect_host,
1.499 djm 1784: rfwd->connect_port);
1785: channel_update_permission(ssh,
1786: rfwd->handle, rfwd->allocated_port);
1787: }
1.366 markus 1788: } else {
1.480 djm 1789: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1790: }
1.324 djm 1791: }
1.468 djm 1792:
1.315 djm 1793: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1794: if (options.exit_on_forward_failure) {
1795: if (rfwd->listen_path != NULL)
1796: fatal("Error: remote port forwarding failed "
1797: "for listen path %s", rfwd->listen_path);
1798: else
1799: fatal("Error: remote port forwarding failed "
1800: "for listen port %d", rfwd->listen_port);
1801: } else {
1802: if (rfwd->listen_path != NULL)
1803: logit("Warning: remote port forwarding failed "
1804: "for listen path %s", rfwd->listen_path);
1805: else
1806: logit("Warning: remote port forwarding failed "
1807: "for listen port %d", rfwd->listen_port);
1808: }
1.315 djm 1809: }
1.523 djm 1810: forwarding_success();
1.315 djm 1811: }
1812:
1.126 itojun 1813: static void
1.463 djm 1814: client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
1.331 dtucker 1815: {
1816: debug("stdio forwarding: done");
1817: cleanup_exit(0);
1818: }
1819:
1.368 djm 1820: static void
1.463 djm 1821: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1822: {
1823: if (!success)
1824: fatal("stdio forwarding failed");
1825: }
1826:
1827: static void
1.523 djm 1828: ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
1829: {
1830: if (!success) {
1831: error("Tunnel forwarding failed");
1832: if (options.exit_on_forward_failure)
1833: cleanup_exit(255);
1834: }
1835:
1.540 djm 1836: debug_f("tunnel forward established, id=%d", id);
1.523 djm 1837: forwarding_success();
1838: }
1839:
1840: static void
1.463 djm 1841: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1842: {
1843: Channel *c;
1.332 djm 1844: int in, out;
1.331 dtucker 1845:
1.441 dtucker 1846: if (options.stdio_forward_host == NULL)
1.368 djm 1847: return;
1848:
1.540 djm 1849: debug3_f("%s:%d", options.stdio_forward_host,
1.441 dtucker 1850: options.stdio_forward_port);
1.332 djm 1851:
1.505 deraadt 1852: if ((in = dup(STDIN_FILENO)) == -1 ||
1853: (out = dup(STDOUT_FILENO)) == -1)
1.557 djm 1854: fatal_f("dup() in/out failed");
1.463 djm 1855: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.557 djm 1856: options.stdio_forward_port, in, out,
1857: CHANNEL_NONBLOCK_STDIO)) == NULL)
1.540 djm 1858: fatal_f("channel_connect_stdio_fwd failed");
1.463 djm 1859: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1860: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1861: }
1862:
1863: static void
1.551 markus 1864: ssh_init_forward_permissions(struct ssh *ssh, const char *what, char **opens,
1865: u_int num_opens)
1866: {
1867: u_int i;
1868: int port;
1.573 dtucker 1869: char *addr, *arg, *oarg;
1.551 markus 1870: int where = FORWARD_LOCAL;
1871:
1872: channel_clear_permission(ssh, FORWARD_ADM, where);
1873: if (num_opens == 0)
1874: return; /* permit any */
1875:
1876: /* handle keywords: "any" / "none" */
1877: if (num_opens == 1 && strcmp(opens[0], "any") == 0)
1878: return;
1879: if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
1880: channel_disable_admin(ssh, where);
1881: return;
1882: }
1883: /* Otherwise treat it as a list of permitted host:port */
1884: for (i = 0; i < num_opens; i++) {
1885: oarg = arg = xstrdup(opens[i]);
1.573 dtucker 1886: addr = hpdelim(&arg);
1887: if (addr == NULL)
1.551 markus 1888: fatal_f("missing host in %s", what);
1889: addr = cleanhostname(addr);
1890: if (arg == NULL || ((port = permitopen_port(arg)) < 0))
1891: fatal_f("bad port number in %s", what);
1892: /* Send it to channels layer */
1893: channel_add_permission(ssh, FORWARD_ADM,
1894: where, addr, port);
1895: free(oarg);
1896: }
1897: }
1898:
1899: static void
1.466 djm 1900: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1901: {
1.86 markus 1902: int success = 0;
1.70 markus 1903: int i;
1.551 markus 1904:
1905: ssh_init_forward_permissions(ssh, "permitremoteopen",
1906: options.permitted_remote_opens,
1907: options.num_permitted_remote_opens);
1.331 dtucker 1908:
1.524 djm 1909: if (options.exit_on_forward_failure)
1910: forward_confirms_pending = 0; /* track pending requests */
1.70 markus 1911: /* Initiate local TCP/IP port forwardings. */
1912: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1913: debug("Local connections to %.200s:%d forwarded to remote "
1914: "address %.200s:%d",
1.406 millert 1915: (options.local_forwards[i].listen_path != NULL) ?
1916: options.local_forwards[i].listen_path :
1.234 deraadt 1917: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1918: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1919: options.local_forwards[i].listen_host,
1920: options.local_forwards[i].listen_port,
1.406 millert 1921: (options.local_forwards[i].connect_path != NULL) ?
1922: options.local_forwards[i].connect_path :
1.232 djm 1923: options.local_forwards[i].connect_host,
1924: options.local_forwards[i].connect_port);
1.463 djm 1925: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1926: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1927: }
1.283 markus 1928: if (i > 0 && success != i && options.exit_on_forward_failure)
1929: fatal("Could not request local forwarding.");
1.86 markus 1930: if (i > 0 && success == 0)
1931: error("Could not request local forwarding.");
1.70 markus 1932:
1933: /* Initiate remote TCP/IP port forwardings. */
1934: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1935: debug("Remote connections from %.200s:%d forwarded to "
1936: "local address %.200s:%d",
1.406 millert 1937: (options.remote_forwards[i].listen_path != NULL) ?
1938: options.remote_forwards[i].listen_path :
1.248 djm 1939: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1940: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1941: options.remote_forwards[i].listen_port,
1.406 millert 1942: (options.remote_forwards[i].connect_path != NULL) ?
1943: options.remote_forwards[i].connect_path :
1.232 djm 1944: options.remote_forwards[i].connect_host,
1945: options.remote_forwards[i].connect_port);
1.523 djm 1946: if ((options.remote_forwards[i].handle =
1.463 djm 1947: channel_request_remote_forwarding(ssh,
1.523 djm 1948: &options.remote_forwards[i])) >= 0) {
1.463 djm 1949: client_register_global_confirm(
1950: ssh_confirm_remote_forward,
1.366 markus 1951: &options.remote_forwards[i]);
1.523 djm 1952: forward_confirms_pending++;
1953: } else if (options.exit_on_forward_failure)
1954: fatal("Could not request remote forwarding.");
1955: else
1956: logit("Warning: Could not request remote forwarding.");
1.70 markus 1957: }
1.301 djm 1958:
1959: /* Initiate tunnel forwarding. */
1960: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1961: if ((*ifname = client_request_tun_fwd(ssh,
1962: options.tun_open, options.tun_local,
1.523 djm 1963: options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
1964: forward_confirms_pending++;
1965: else if (options.exit_on_forward_failure)
1966: fatal("Could not request tunnel forwarding.");
1967: else
1968: error("Could not request tunnel forwarding.");
1.524 djm 1969: }
1970: if (forward_confirms_pending > 0) {
1.540 djm 1971: debug_f("expecting replies for %d forwards",
1.524 djm 1972: forward_confirms_pending);
1.468 djm 1973: }
1.70 markus 1974: }
1975:
1.126 itojun 1976: static void
1.70 markus 1977: check_agent_present(void)
1978: {
1.412 djm 1979: int r;
1980:
1.70 markus 1981: if (options.forward_agent) {
1.254 djm 1982: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1983: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1984: options.forward_agent = 0;
1.412 djm 1985: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.540 djm 1986: debug_r(r, "ssh_get_authentication_socket");
1.412 djm 1987: }
1.70 markus 1988: }
1989: }
1990:
1.214 djm 1991: static void
1.463 djm 1992: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 1993: {
1.215 djm 1994: extern char **environ;
1.558 djm 1995: const char *display, *term;
1.499 djm 1996: int r, interactive = tty_flag;
1.433 djm 1997: char *proto = NULL, *data = NULL;
1.337 djm 1998:
1999: if (!success)
2000: return; /* No need for error message, channels code sens one */
1.215 djm 2001:
1.248 djm 2002: display = getenv("DISPLAY");
1.417 djm 2003: if (display == NULL && options.forward_x11)
2004: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 2005: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 2006: options.xauth_location, options.forward_x11_trusted,
2007: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 2008: /* Request forwarding with authentication spoofing. */
1.316 djm 2009: debug("Requesting X11 forwarding with authentication "
2010: "spoofing.");
1.463 djm 2011: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 2012: data, 1);
1.463 djm 2013: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 2014: /* XXX exit_on_forward_failure */
1.80 markus 2015: interactive = 1;
1.50 markus 2016: }
2017:
1.70 markus 2018: check_agent_present();
2019: if (options.forward_agent) {
2020: debug("Requesting authentication agent forwarding.");
1.463 djm 2021: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 2022: if ((r = sshpkt_send(ssh)) != 0)
1.540 djm 2023: fatal_fr(r, "send packet");
1.212 djm 2024: }
1.369 dtucker 2025:
2026: /* Tell the packet module whether this is an interactive session. */
1.499 djm 2027: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 2028: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 2029:
1.558 djm 2030: if ((term = lookup_env_in_list("TERM", options.setenv,
2031: options.num_setenv)) == NULL || *term == '\0')
2032: term = getenv("TERM");
1.562 djm 2033: client_session2_setup(ssh, id, tty_flag,
2034: options.session_type == SESSION_TYPE_SUBSYSTEM, term,
1.482 markus 2035: NULL, fileno(stdin), command, environ);
1.45 markus 2036: }
2037:
1.143 markus 2038: /* open new channel for a session */
1.126 itojun 2039: static int
1.463 djm 2040: ssh_session2_open(struct ssh *ssh)
1.45 markus 2041: {
1.118 markus 2042: Channel *c;
2043: int window, packetmax, in, out, err;
1.60 markus 2044:
1.563 djm 2045: if (options.stdin_null) {
1.93 itojun 2046: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 2047: } else {
2048: in = dup(STDIN_FILENO);
2049: }
1.60 markus 2050: out = dup(STDOUT_FILENO);
2051: err = dup(STDERR_FILENO);
1.45 markus 2052:
1.505 deraadt 2053: if (in == -1 || out == -1 || err == -1)
1.62 markus 2054: fatal("dup() in/out/err failed");
1.45 markus 2055:
1.65 markus 2056: window = CHAN_SES_WINDOW_DEFAULT;
2057: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 2058: if (tty_flag) {
2059: window >>= 1;
2060: packetmax >>= 1;
1.45 markus 2061: }
1.463 djm 2062: c = channel_new(ssh,
1.45 markus 2063: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 2064: window, packetmax, CHAN_EXTENDED_WRITE,
1.557 djm 2065: "client-session", CHANNEL_NONBLOCK_STDIO);
1.45 markus 2066:
1.540 djm 2067: debug3_f("channel_new: %d", c->self);
1.106 markus 2068:
1.463 djm 2069: channel_send_open(ssh, c->self);
1.560 djm 2070: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2071: channel_register_open_confirm(ssh, c->self,
1.310 djm 2072: ssh_session2_setup, NULL);
1.106 markus 2073:
1.118 markus 2074: return c->self;
1.106 markus 2075: }
2076:
1.126 itojun 2077: static int
1.544 djm 2078: ssh_session2(struct ssh *ssh, const struct ssh_conn_info *cinfo)
1.106 markus 2079: {
1.537 djm 2080: int r, id = -1;
1.466 djm 2081: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 2082:
2083: /* XXX should be pre-session */
1.368 djm 2084: if (!options.control_persist)
1.463 djm 2085: ssh_init_stdio_forwarding(ssh);
1.466 djm 2086:
2087: ssh_init_forwarding(ssh, &tun_fwd_ifname);
2088:
2089: if (options.local_command != NULL) {
2090: debug3("expanding LocalCommand: %s", options.local_command);
2091: cp = options.local_command;
2092: options.local_command = percent_expand(cp,
1.546 djm 2093: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.466 djm 2094: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2095: (char *)NULL);
2096: debug3("expanded LocalCommand: %s", options.local_command);
2097: free(cp);
2098: }
1.106 markus 2099:
1.344 djm 2100: /* Start listening for multiplex clients */
1.499 djm 2101: if (!ssh_packet_get_mux(ssh))
1.463 djm 2102: muxserver_listen(ssh);
1.344 djm 2103:
1.473 djm 2104: /*
1.368 djm 2105: * If we are in control persist mode and have a working mux listen
2106: * socket, then prepare to background ourselves and have a foreground
1.531 djm 2107: * client attach as a control client.
1.368 djm 2108: * NB. we must save copies of the flags that we override for
1.531 djm 2109: * the backgrounding, since we defer attachment of the client until
1.344 djm 2110: * after the connection is fully established (in particular,
2111: * async rfwd replies have been received for ExitOnForwardFailure).
2112: */
1.473 djm 2113: if (options.control_persist && muxserver_sock != -1) {
1.563 djm 2114: ostdin_null_flag = options.stdin_null;
1.560 djm 2115: osession_type = options.session_type;
1.359 djm 2116: orequest_tty = options.request_tty;
1.344 djm 2117: otty_flag = tty_flag;
1.563 djm 2118: options.stdin_null = 1;
1.560 djm 2119: options.session_type = SESSION_TYPE_NONE;
1.473 djm 2120: tty_flag = 0;
1.564 djm 2121: if (!options.fork_after_authentication &&
1.562 djm 2122: (osession_type != SESSION_TYPE_NONE ||
2123: options.stdio_forward_host != NULL))
1.344 djm 2124: need_controlpersist_detach = 1;
1.564 djm 2125: options.fork_after_authentication = 1;
1.473 djm 2126: }
1.368 djm 2127: /*
2128: * ControlPersist mux listen socket setup failed, attempt the
2129: * stdio forward setup that we skipped earlier.
2130: */
2131: if (options.control_persist && muxserver_sock == -1)
1.463 djm 2132: ssh_init_stdio_forwarding(ssh);
1.344 djm 2133:
1.560 djm 2134: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2135: id = ssh_session2_open(ssh);
1.379 djm 2136: else {
1.499 djm 2137: ssh_packet_set_interactive(ssh,
1.379 djm 2138: options.control_master == SSHCTL_MASTER_NO,
2139: options.ip_qos_interactive, options.ip_qos_bulk);
2140: }
1.314 djm 2141:
2142: /* If we don't expect to open a new session, then disallow it */
1.319 markus 2143: if (options.control_master == SSHCTL_MASTER_NO &&
1.549 djm 2144: (ssh->compat & SSH_NEW_OPENSSH)) {
1.314 djm 2145: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 2146: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2147: (r = sshpkt_put_cstring(ssh,
2148: "no-more-sessions@openssh.com")) != 0 ||
2149: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2150: (r = sshpkt_send(ssh)) != 0)
1.540 djm 2151: fatal_fr(r, "send packet");
1.314 djm 2152: }
1.255 reyk 2153:
2154: /* Execute a local command */
2155: if (options.local_command != NULL &&
2156: options.permit_local_command)
2157: ssh_local_cmd(options.local_command);
1.467 djm 2158:
2159: /*
2160: * stdout is now owned by the session channel; clobber it here
2161: * so future channel closes are propagated to the local fd.
2162: * NB. this can only happen after LocalCommand has completed,
2163: * as it may want to write to stdout.
2164: */
1.537 djm 2165: if (!need_controlpersist_detach && stdfd_devnull(0, 1, 0) == -1)
1.540 djm 2166: error_f("stdfd_devnull failed");
1.301 djm 2167:
1.342 djm 2168: /*
2169: * If requested and we are not interested in replies to remote
2170: * forwarding requests, then let ssh continue in the background.
2171: */
1.564 djm 2172: if (options.fork_after_authentication) {
1.344 djm 2173: if (options.exit_on_forward_failure &&
2174: options.num_remote_forwards > 0) {
2175: debug("deferring postauth fork until remote forward "
2176: "confirmation received");
2177: } else
2178: fork_postauth();
1.318 djm 2179: }
1.31 markus 2180:
1.463 djm 2181: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2182: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2183: }
2184:
1.426 djm 2185: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2186: static void
1.544 djm 2187: load_public_identity_files(const struct ssh_conn_info *cinfo)
1.104 markus 2188: {
1.466 djm 2189: char *filename, *cp;
1.460 markus 2190: struct sshkey *public;
1.426 djm 2191: int i;
2192: u_int n_ids, n_certs;
1.335 djm 2193: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2194: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2195: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2196: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2197: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2198: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2199: #ifdef ENABLE_PKCS11
1.514 djm 2200: struct sshkey **keys = NULL;
2201: char **comments = NULL;
1.333 markus 2202: int nkeys;
1.335 djm 2203: #endif /* PKCS11 */
1.104 markus 2204:
1.426 djm 2205: n_ids = n_certs = 0;
1.398 tedu 2206: memset(identity_files, 0, sizeof(identity_files));
2207: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2208: memset(identity_file_userprovided, 0,
2209: sizeof(identity_file_userprovided));
1.426 djm 2210: memset(certificate_files, 0, sizeof(certificate_files));
2211: memset(certificates, 0, sizeof(certificates));
1.484 djm 2212: memset(certificate_file_userprovided, 0,
2213: sizeof(certificate_file_userprovided));
1.335 djm 2214:
2215: #ifdef ENABLE_PKCS11
1.333 markus 2216: if (options.pkcs11_provider != NULL &&
1.167 markus 2217: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2218: (pkcs11_init(!options.batch_mode) == 0) &&
2219: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1.514 djm 2220: &keys, &comments)) > 0) {
1.333 markus 2221: for (i = 0; i < nkeys; i++) {
1.335 djm 2222: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2223: sshkey_free(keys[i]);
1.514 djm 2224: free(comments[i]);
1.335 djm 2225: continue;
2226: }
2227: identity_keys[n_ids] = keys[i];
1.514 djm 2228: identity_files[n_ids] = comments[i]; /* transferred */
1.335 djm 2229: n_ids++;
1.167 markus 2230: }
1.378 djm 2231: free(keys);
1.514 djm 2232: free(comments);
1.127 markus 2233: }
1.333 markus 2234: #endif /* ENABLE_PKCS11 */
1.335 djm 2235: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2236: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2237: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2238: free(options.identity_files[i]);
1.426 djm 2239: options.identity_files[i] = NULL;
1.335 djm 2240: continue;
2241: }
1.490 dtucker 2242: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.544 djm 2243: filename = default_client_percent_dollar_expand(cp, cinfo);
1.378 djm 2244: free(cp);
1.483 markus 2245: check_load(sshkey_load_public(filename, &public, NULL),
2246: filename, "pubkey");
1.131 millert 2247: debug("identity file %s type %d", filename,
2248: public ? public->type : -1);
1.378 djm 2249: free(options.identity_files[i]);
1.335 djm 2250: identity_files[n_ids] = filename;
2251: identity_keys[n_ids] = public;
1.484 djm 2252: identity_file_userprovided[n_ids] =
2253: options.identity_file_userprovided[i];
1.335 djm 2254: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2255: continue;
2256:
1.426 djm 2257: /*
2258: * If no certificates have been explicitly listed then try
2259: * to add the default certificate variant too.
2260: */
2261: if (options.num_certificate_files != 0)
2262: continue;
1.335 djm 2263: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2264: check_load(sshkey_load_public(cp, &public, NULL),
2265: filename, "pubkey");
1.335 djm 2266: debug("identity file %s type %d", cp,
2267: public ? public->type : -1);
2268: if (public == NULL) {
1.378 djm 2269: free(cp);
1.335 djm 2270: continue;
2271: }
1.483 markus 2272: if (!sshkey_is_cert(public)) {
1.540 djm 2273: debug_f("key %s type %s is not a certificate",
2274: cp, sshkey_type(public));
1.483 markus 2275: sshkey_free(public);
1.378 djm 2276: free(cp);
1.335 djm 2277: continue;
2278: }
1.448 djm 2279: /* NB. leave filename pointing to private key */
2280: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2281: identity_keys[n_ids] = public;
1.484 djm 2282: identity_file_userprovided[n_ids] =
2283: options.identity_file_userprovided[i];
1.335 djm 2284: n_ids++;
2285: }
1.426 djm 2286:
2287: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
1.540 djm 2288: fatal_f("too many certificates");
1.426 djm 2289: for (i = 0; i < options.num_certificate_files; i++) {
2290: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2291: getuid());
1.544 djm 2292: filename = default_client_percent_dollar_expand(cp, cinfo);
1.426 djm 2293: free(cp);
2294:
1.483 markus 2295: check_load(sshkey_load_public(filename, &public, NULL),
2296: filename, "certificate");
1.426 djm 2297: debug("certificate file %s type %d", filename,
2298: public ? public->type : -1);
2299: free(options.certificate_files[i]);
2300: options.certificate_files[i] = NULL;
2301: if (public == NULL) {
2302: free(filename);
2303: continue;
2304: }
1.483 markus 2305: if (!sshkey_is_cert(public)) {
1.540 djm 2306: debug_f("key %s type %s is not a certificate",
2307: filename, sshkey_type(public));
1.483 markus 2308: sshkey_free(public);
1.426 djm 2309: free(filename);
2310: continue;
2311: }
2312: certificate_files[n_certs] = filename;
2313: certificates[n_certs] = public;
1.484 djm 2314: certificate_file_userprovided[n_certs] =
2315: options.certificate_file_userprovided[i];
1.426 djm 2316: ++n_certs;
2317: }
2318:
1.335 djm 2319: options.num_identity_files = n_ids;
2320: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2321: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2322: memcpy(options.identity_file_userprovided,
2323: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2324:
2325: options.num_certificate_files = n_certs;
2326: memcpy(options.certificate_files,
2327: certificate_files, sizeof(certificate_files));
2328: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2329: memcpy(options.certificate_file_userprovided,
2330: certificate_file_userprovided,
2331: sizeof(certificate_file_userprovided));
1.214 djm 2332: }
1.352 djm 2333:
2334: static void
2335: main_sigchld_handler(int sig)
2336: {
2337: int save_errno = errno;
2338: pid_t pid;
2339: int status;
2340:
2341: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2342: (pid == -1 && errno == EINTR))
1.352 djm 2343: ;
2344: errno = save_errno;
2345: }
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