Annotation of src/usr.bin/ssh/ssh.c, Revision 1.565
1.565 ! djm 1: /* $OpenBSD: ssh.c,v 1.564 2021/07/23 04:04:52 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"
172: " [-w local_tun[:remote_tun]] destination [command]\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';
1.400 djm 246:
1.427 djm 247: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 248: memset(&hints, 0, sizeof(hints));
1.400 djm 249: hints.ai_family = options.address_family == -1 ?
250: AF_UNSPEC : options.address_family;
1.385 djm 251: hints.ai_socktype = SOCK_STREAM;
252: if (cname != NULL)
253: hints.ai_flags = AI_CANONNAME;
254: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
255: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
256: loglevel = SYSLOG_LEVEL_ERROR;
257: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
258: __progname, name, ssh_gai_strerror(gaierr));
259: return NULL;
260: }
261: if (cname != NULL && res->ai_canonname != NULL) {
262: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
1.540 djm 263: error_f("host \"%s\" cname \"%s\" too long (max %lu)",
264: name, res->ai_canonname, (u_long)clen);
1.385 djm 265: if (clen > 0)
266: *cname = '\0';
267: }
268: }
269: return res;
270: }
271:
1.470 djm 272: /* Returns non-zero if name can only be an address and not a hostname */
273: static int
274: is_addr_fast(const char *name)
275: {
276: return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
277: strspn(name, "0123456789.") == strlen(name));
278: }
279:
280: /* Returns non-zero if name represents a valid, single address */
281: static int
282: is_addr(const char *name)
283: {
284: char strport[NI_MAXSERV];
285: struct addrinfo hints, *res;
286:
287: if (is_addr_fast(name))
288: return 1;
289:
290: snprintf(strport, sizeof strport, "%u", default_ssh_port());
291: memset(&hints, 0, sizeof(hints));
292: hints.ai_family = options.address_family == -1 ?
293: AF_UNSPEC : options.address_family;
294: hints.ai_socktype = SOCK_STREAM;
295: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
296: if (getaddrinfo(name, strport, &hints, &res) != 0)
297: return 0;
298: if (res == NULL || res->ai_next != NULL) {
299: freeaddrinfo(res);
300: return 0;
301: }
302: freeaddrinfo(res);
303: return 1;
304: }
305:
1.385 djm 306: /*
1.413 djm 307: * Attempt to resolve a numeric host address / port to a single address.
308: * Returns a canonical address string.
309: * Returns NULL on failure.
310: * NB. this function must operate with a options having undefined members.
311: */
312: static struct addrinfo *
313: resolve_addr(const char *name, int port, char *caddr, size_t clen)
314: {
315: char addr[NI_MAXHOST], strport[NI_MAXSERV];
316: struct addrinfo hints, *res;
317: int gaierr;
318:
319: if (port <= 0)
320: port = default_ssh_port();
321: snprintf(strport, sizeof strport, "%u", port);
322: memset(&hints, 0, sizeof(hints));
323: hints.ai_family = options.address_family == -1 ?
324: AF_UNSPEC : options.address_family;
325: hints.ai_socktype = SOCK_STREAM;
326: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
327: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
1.540 djm 328: debug2_f("could not resolve name %.100s as address: %s",
329: name, ssh_gai_strerror(gaierr));
1.413 djm 330: return NULL;
331: }
332: if (res == NULL) {
1.540 djm 333: debug_f("getaddrinfo %.100s returned no addresses", name);
1.413 djm 334: return NULL;
335: }
336: if (res->ai_next != NULL) {
1.540 djm 337: debug_f("getaddrinfo %.100s returned multiple addresses", name);
1.413 djm 338: goto fail;
339: }
340: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
341: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
1.540 djm 342: debug_f("Could not format address for name %.100s: %s",
343: name, ssh_gai_strerror(gaierr));
1.413 djm 344: goto fail;
345: }
346: if (strlcpy(caddr, addr, clen) >= clen) {
1.540 djm 347: error_f("host \"%s\" addr \"%s\" too long (max %lu)",
348: name, addr, (u_long)clen);
1.413 djm 349: if (clen > 0)
350: *caddr = '\0';
351: fail:
352: freeaddrinfo(res);
353: return NULL;
354: }
355: return res;
356: }
357:
358: /*
1.385 djm 359: * Check whether the cname is a permitted replacement for the hostname
360: * and perform the replacement if it is.
1.400 djm 361: * NB. this function must operate with a options having undefined members.
1.385 djm 362: */
363: static int
1.443 djm 364: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 365: {
366: int i;
367: struct allowed_cname *rule;
368:
369: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
370: strcmp(*namep, cname) == 0)
371: return 0;
1.386 djm 372: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 373: return 0;
374: /*
1.386 djm 375: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 376: * a proxy or jump host unless the user specifically requests so.
1.385 djm 377: */
1.443 djm 378: if (!direct &&
1.386 djm 379: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 380: return 0;
1.540 djm 381: debug3_f("check \"%s\" CNAME \"%s\"", *namep, cname);
1.385 djm 382: for (i = 0; i < options.num_permitted_cnames; i++) {
383: rule = options.permitted_cnames + i;
1.418 djm 384: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
385: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 386: continue;
1.386 djm 387: verbose("Canonicalized DNS aliased hostname "
1.385 djm 388: "\"%s\" => \"%s\"", *namep, cname);
389: free(*namep);
390: *namep = xstrdup(cname);
391: return 1;
392: }
393: return 0;
394: }
395:
396: /*
397: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 398: * canonicalization rules. Returns the address list for the host or NULL
399: * if no name was found after canonicalization.
1.400 djm 400: * NB. this function must operate with a options having undefined members.
1.385 djm 401: */
402: static struct addrinfo *
1.400 djm 403: resolve_canonicalize(char **hostp, int port)
1.385 djm 404: {
1.443 djm 405: int i, direct, ndots;
1.413 djm 406: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 407: struct addrinfo *addrs;
408:
409: /*
1.470 djm 410: * Attempt to canonicalise addresses, regardless of
411: * whether hostname canonicalisation was requested
1.385 djm 412: */
1.413 djm 413: if ((addrs = resolve_addr(*hostp, port,
414: newname, sizeof(newname))) != NULL) {
1.540 djm 415: debug2_f("hostname %.100s is address", *hostp);
1.413 djm 416: if (strcasecmp(*hostp, newname) != 0) {
1.540 djm 417: debug2_f("canonicalised address \"%s\" => \"%s\"",
418: *hostp, newname);
1.413 djm 419: free(*hostp);
420: *hostp = xstrdup(newname);
421: }
422: return addrs;
423: }
424:
1.470 djm 425: /*
426: * If this looks like an address but didn't parse as one, it might
427: * be an address with an invalid interface scope. Skip further
428: * attempts at canonicalisation.
429: */
430: if (is_addr_fast(*hostp)) {
1.540 djm 431: debug_f("hostname %.100s is an unrecognised address", *hostp);
1.470 djm 432: return NULL;
433: }
434:
435: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
436: return NULL;
437:
438: /*
439: * Don't attempt to canonicalize names that will be interpreted by
440: * a proxy unless the user specifically requests so.
441: */
442: direct = option_clear_or_none(options.proxy_command) &&
443: options.jump_host == NULL;
444: if (!direct &&
445: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
446: return NULL;
447:
1.428 djm 448: /* If domain name is anchored, then resolve it now */
449: if ((*hostp)[strlen(*hostp) - 1] == '.') {
1.540 djm 450: debug3_f("name is fully qualified");
1.428 djm 451: fullhost = xstrdup(*hostp);
452: if ((addrs = resolve_host(fullhost, port, 0,
453: newname, sizeof(newname))) != NULL)
454: goto found;
455: free(fullhost);
456: goto notfound;
457: }
458:
1.387 djm 459: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 460: ndots = 0;
461: for (cp = *hostp; *cp != '\0'; cp++) {
462: if (*cp == '.')
463: ndots++;
464: }
1.386 djm 465: if (ndots > options.canonicalize_max_dots) {
1.540 djm 466: debug3_f("not canonicalizing hostname \"%s\" (max dots %d)",
467: *hostp, options.canonicalize_max_dots);
1.385 djm 468: return NULL;
469: }
470: /* Attempt each supplied suffix */
471: for (i = 0; i < options.num_canonical_domains; i++) {
1.559 djm 472: if (strcasecmp(options.canonical_domains[i], "none") == 0)
473: break;
1.385 djm 474: xasprintf(&fullhost, "%s.%s.", *hostp,
475: options.canonical_domains[i]);
1.540 djm 476: debug3_f("attempting \"%s\" => \"%s\"", *hostp, fullhost);
1.400 djm 477: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 478: newname, sizeof(newname))) == NULL) {
1.385 djm 479: free(fullhost);
480: continue;
481: }
1.428 djm 482: found:
1.385 djm 483: /* Remove trailing '.' */
484: fullhost[strlen(fullhost) - 1] = '\0';
485: /* Follow CNAME if requested */
1.443 djm 486: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 487: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 488: *hostp, fullhost);
489: }
490: free(*hostp);
491: *hostp = fullhost;
492: return addrs;
493: }
1.428 djm 494: notfound:
1.386 djm 495: if (!options.canonicalize_fallback_local)
1.400 djm 496: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
1.540 djm 497: debug2_f("host %s not found in any suffix", *hostp);
1.385 djm 498: return NULL;
499: }
500:
1.32 deraadt 501: /*
1.483 markus 502: * Check the result of hostkey loading, ignoring some errors and
503: * fatal()ing for others.
504: */
505: static void
506: check_load(int r, const char *path, const char *message)
507: {
508: switch (r) {
509: case 0:
510: break;
511: case SSH_ERR_INTERNAL_ERROR:
512: case SSH_ERR_ALLOC_FAIL:
1.540 djm 513: fatal_r(r, "load %s \"%s\"", message, path);
1.483 markus 514: case SSH_ERR_SYSTEM_ERROR:
515: /* Ignore missing files */
516: if (errno == ENOENT)
517: break;
518: /* FALLTHROUGH */
519: default:
1.540 djm 520: error_r(r, "load %s \"%s\"", message, path);
1.483 markus 521: break;
522: }
523: }
524:
525: /*
1.400 djm 526: * Read per-user configuration file. Ignore the system wide config
527: * file if the user specifies a config file on the command line.
528: */
529: static void
1.496 djm 530: process_config_files(const char *host_name, struct passwd *pw, int final_pass,
531: int *want_final_pass)
1.400 djm 532: {
1.414 deraadt 533: char buf[PATH_MAX];
1.400 djm 534: int r;
535:
536: if (config != NULL) {
537: if (strcasecmp(config, "none") != 0 &&
1.466 djm 538: !read_config_file(config, pw, host, host_name, &options,
1.496 djm 539: SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0),
540: want_final_pass))
1.400 djm 541: fatal("Can't open user config file %.100s: "
542: "%.100s", config, strerror(errno));
543: } else {
544: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
545: _PATH_SSH_USER_CONFFILE);
546: if (r > 0 && (size_t)r < sizeof(buf))
1.466 djm 547: (void)read_config_file(buf, pw, host, host_name,
1.408 djm 548: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
1.496 djm 549: (final_pass ? SSHCONF_FINAL : 0), want_final_pass);
1.400 djm 550:
551: /* Read systemwide configuration file after user config. */
1.408 djm 552: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
1.466 djm 553: host, host_name, &options,
1.496 djm 554: final_pass ? SSHCONF_FINAL : 0, want_final_pass);
1.408 djm 555: }
556: }
557:
558: /* Rewrite the port number in an addrinfo list of addresses */
559: static void
560: set_addrinfo_port(struct addrinfo *addrs, int port)
561: {
562: struct addrinfo *addr;
563:
564: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
565: switch (addr->ai_family) {
566: case AF_INET:
567: ((struct sockaddr_in *)addr->ai_addr)->
568: sin_port = htons(port);
569: break;
570: case AF_INET6:
571: ((struct sockaddr_in6 *)addr->ai_addr)->
572: sin6_port = htons(port);
573: break;
574: }
1.400 djm 575: }
576: }
577:
1.544 djm 578: static void
579: ssh_conn_info_free(struct ssh_conn_info *cinfo)
580: {
581: if (cinfo == NULL)
582: return;
583: free(cinfo->conn_hash_hex);
584: free(cinfo->shorthost);
585: free(cinfo->uidstr);
586: free(cinfo->keyalias);
587: free(cinfo->thishost);
588: free(cinfo->host_arg);
589: free(cinfo->portstr);
590: free(cinfo->remhost);
591: free(cinfo->remuser);
592: free(cinfo->homedir);
593: free(cinfo->locuser);
594: free(cinfo);
595: }
596:
1.400 djm 597: /*
1.32 deraadt 598: * Main program for the ssh client.
599: */
1.2 provos 600: int
601: main(int ac, char **av)
1.1 deraadt 602: {
1.437 djm 603: struct ssh *ssh = NULL;
1.462 djm 604: int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
1.496 djm 605: int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
1.544 djm 606: char *p, *cp, *line, *argv0, *logfile, *host_arg;
607: char cname[NI_MAXHOST], thishost[NI_MAXHOST];
1.31 markus 608: struct stat st;
1.98 markus 609: struct passwd *pw;
1.144 stevesk 610: extern int optind, optreset;
611: extern char *optarg;
1.406 millert 612: struct Forward fwd;
1.385 djm 613: struct addrinfo *addrs = NULL;
1.513 dtucker 614: size_t n, len;
1.532 dtucker 615: u_int j;
1.544 djm 616: struct ssh_conn_info *cinfo = NULL;
1.250 djm 617:
618: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
619: sanitise_stdfd();
1.31 markus 620:
1.33 markus 621: /*
1.346 djm 622: * Discard other fds that are hanging around. These can cause problem
623: * with backgrounded ssh processes started by ControlPersist.
624: */
625: closefrom(STDERR_FILENO + 1);
626:
1.487 dtucker 627: if (getuid() != geteuid())
628: fatal("ssh setuid not supported.");
629: if (getgid() != getegid())
630: fatal("ssh setgid not supported.");
1.184 stevesk 631:
1.107 markus 632: /* Get user data. */
1.490 dtucker 633: pw = getpwuid(getuid());
1.107 markus 634: if (!pw) {
1.490 dtucker 635: logit("No user exists for uid %lu", (u_long)getuid());
1.257 dtucker 636: exit(255);
1.107 markus 637: }
638: /* Take a copy of the returned structure. */
639: pw = pwcopy(pw);
1.31 markus 640:
1.33 markus 641: /*
642: * Set our umask to something reasonable, as some files are created
643: * with the default umask. This will make them world-readable but
644: * writable only by the owner, which is ok for all files for which we
645: * don't set the modes explicitly.
646: */
1.31 markus 647: umask(022);
1.445 djm 648:
649: setlocale(LC_CTYPE, "");
1.31 markus 650:
1.316 djm 651: /*
652: * Initialize option structure to indicate that no values have been
653: * set.
654: */
1.31 markus 655: initialize_options(&options);
656:
1.463 djm 657: /*
658: * Prepare main ssh transport/connection structures
659: */
660: if ((ssh = ssh_alloc_session_state()) == NULL)
661: fatal("Couldn't allocate session state");
662: channel_init_channels(ssh);
663:
1.31 markus 664: /* Parse command-line arguments. */
665: host = NULL;
1.320 djm 666: use_syslog = 0;
1.375 dtucker 667: logfile = NULL;
1.325 markus 668: argv0 = av[0];
1.31 markus 669:
1.266 djm 670: again:
1.316 djm 671: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.474 djm 672: "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 673: switch (opt) {
1.91 jakob 674: case '1':
1.454 djm 675: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 676: break;
1.47 markus 677: case '2':
1.454 djm 678: /* Ignored */
1.47 markus 679: break;
1.37 markus 680: case '4':
1.196 djm 681: options.address_family = AF_INET;
1.37 markus 682: break;
683: case '6':
1.196 djm 684: options.address_family = AF_INET6;
1.37 markus 685: break;
1.31 markus 686: case 'n':
1.563 djm 687: options.stdin_null = 1;
1.31 markus 688: break;
689: case 'f':
1.564 djm 690: options.fork_after_authentication = 1;
1.563 djm 691: options.stdin_null = 1;
1.31 markus 692: break;
693: case 'x':
694: options.forward_x11 = 0;
695: break;
696: case 'X':
697: options.forward_x11 = 1;
698: break;
1.320 djm 699: case 'y':
700: use_syslog = 1;
701: break;
1.375 dtucker 702: case 'E':
1.422 dtucker 703: logfile = optarg;
1.375 dtucker 704: break;
1.408 djm 705: case 'G':
706: config_test = 1;
707: break;
1.202 markus 708: case 'Y':
709: options.forward_x11 = 1;
710: options.forward_x11_trusted = 1;
711: break;
1.31 markus 712: case 'g':
1.406 millert 713: options.fwd_opts.gateway_ports = 1;
1.31 markus 714: break;
1.229 djm 715: case 'O':
1.441 dtucker 716: if (options.stdio_forward_host != NULL)
1.332 djm 717: fatal("Cannot specify multiplexing "
718: "command with -W");
719: else if (muxclient_command != 0)
720: fatal("Multiplexing command already specified");
1.229 djm 721: if (strcmp(optarg, "check") == 0)
1.312 djm 722: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 723: else if (strcmp(optarg, "forward") == 0)
724: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 725: else if (strcmp(optarg, "exit") == 0)
1.312 djm 726: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 727: else if (strcmp(optarg, "stop") == 0)
728: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 729: else if (strcmp(optarg, "cancel") == 0)
730: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 731: else if (strcmp(optarg, "proxy") == 0)
732: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 733: else
734: fatal("Invalid multiplex command.");
735: break;
1.183 stevesk 736: case 'P': /* deprecated */
1.376 djm 737: break;
1.394 deraadt 738: case 'Q':
1.376 djm 739: cp = NULL;
1.519 dtucker 740: if (strcmp(optarg, "cipher") == 0 ||
741: strcasecmp(optarg, "Ciphers") == 0)
1.393 djm 742: cp = cipher_alg_list('\n', 0);
1.394 deraadt 743: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 744: cp = cipher_alg_list('\n', 1);
1.519 dtucker 745: else if (strcmp(optarg, "mac") == 0 ||
746: strcasecmp(optarg, "MACs") == 0)
1.392 dtucker 747: cp = mac_alg_list('\n');
1.519 dtucker 748: else if (strcmp(optarg, "kex") == 0 ||
749: strcasecmp(optarg, "KexAlgorithms") == 0)
1.392 dtucker 750: cp = kex_alg_list('\n');
1.394 deraadt 751: else if (strcmp(optarg, "key") == 0)
1.451 djm 752: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 753: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 754: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 755: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 756: cp = sshkey_alg_list(0, 1, 0, '\n');
1.519 dtucker 757: else if (strcmp(optarg, "key-sig") == 0 ||
1.547 dtucker 758: strcasecmp(optarg, "PubkeyAcceptedKeyTypes") == 0 || /* deprecated name */
759: strcasecmp(optarg, "PubkeyAcceptedAlgorithms") == 0 ||
1.519 dtucker 760: strcasecmp(optarg, "HostKeyAlgorithms") == 0 ||
1.548 dtucker 761: strcasecmp(optarg, "HostbasedKeyTypes") == 0 || /* deprecated name */
762: strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 0 || /* deprecated name */
763: strcasecmp(optarg, "HostbasedAcceptedAlgorithms") == 0)
1.519 dtucker 764: cp = sshkey_alg_list(0, 0, 1, '\n');
1.491 djm 765: else if (strcmp(optarg, "sig") == 0)
1.492 djm 766: cp = sshkey_alg_list(0, 1, 1, '\n');
1.491 djm 767: else if (strcmp(optarg, "protocol-version") == 0)
1.416 djm 768: cp = xstrdup("2");
1.513 dtucker 769: else if (strcmp(optarg, "compression") == 0) {
770: cp = xstrdup(compression_alg_list(0));
771: len = strlen(cp);
772: for (n = 0; n < len; n++)
773: if (cp[n] == ',')
774: cp[n] = '\n';
775: } else if (strcmp(optarg, "help") == 0) {
1.491 djm 776: cp = xstrdup(
1.513 dtucker 777: "cipher\ncipher-auth\ncompression\nkex\n"
1.519 dtucker 778: "key\nkey-cert\nkey-plain\nkey-sig\nmac\n"
1.491 djm 779: "protocol-version\nsig");
1.416 djm 780: }
1.376 djm 781: if (cp == NULL)
782: fatal("Unsupported query \"%s\"", optarg);
783: printf("%s\n", cp);
784: free(cp);
785: exit(0);
1.31 markus 786: break;
787: case 'a':
788: options.forward_agent = 0;
1.53 markus 789: break;
790: case 'A':
791: options.forward_agent = 1;
1.31 markus 792: break;
793: case 'k':
1.204 dtucker 794: options.gss_deleg_creds = 0;
1.297 djm 795: break;
796: case 'K':
797: options.gss_authentication = 1;
798: options.gss_deleg_creds = 1;
1.31 markus 799: break;
800: case 'i':
1.490 dtucker 801: p = tilde_expand_filename(optarg, getuid());
1.505 deraadt 802: if (stat(p, &st) == -1)
1.128 fgsch 803: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 804: "not accessible: %s.\n", p,
1.231 otto 805: strerror(errno));
1.429 dtucker 806: else
807: add_identity_file(&options, NULL, p, 1);
808: free(p);
1.31 markus 809: break;
1.127 markus 810: case 'I':
1.333 markus 811: #ifdef ENABLE_PKCS11
1.422 dtucker 812: free(options.pkcs11_provider);
1.333 markus 813: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 814: #else
1.333 markus 815: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 816: #endif
1.127 markus 817: break;
1.443 djm 818: case 'J':
1.504 djm 819: if (options.jump_host != NULL) {
820: fatal("Only a single -J option is permitted "
821: "(use commas to separate multiple "
822: "jump hops)");
823: }
1.443 djm 824: if (options.proxy_command != NULL)
825: fatal("Cannot specify -J with ProxyCommand");
826: if (parse_jump(optarg, &options, 1) == -1)
827: fatal("Invalid -J argument");
828: options.proxy_command = xstrdup("none");
829: break;
1.31 markus 830: case 't':
1.359 djm 831: if (options.request_tty == REQUEST_TTY_YES)
832: options.request_tty = REQUEST_TTY_FORCE;
833: else
834: options.request_tty = REQUEST_TTY_YES;
1.31 markus 835: break;
836: case 'v':
1.197 markus 837: if (debug_flag == 0) {
1.66 markus 838: debug_flag = 1;
839: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 840: } else {
1.443 djm 841: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
842: debug_flag++;
1.197 markus 843: options.log_level++;
1.443 djm 844: }
1.197 markus 845: }
1.375 dtucker 846: break;
1.31 markus 847: case 'V':
1.209 markus 848: fprintf(stderr, "%s, %s\n",
1.541 dtucker 849: SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 850: if (opt == 'V')
851: exit(0);
852: break;
1.255 reyk 853: case 'w':
1.256 reyk 854: if (options.tun_open == -1)
855: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 856: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 857: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 858: fprintf(stderr,
859: "Bad tun device '%s'\n", optarg);
1.257 dtucker 860: exit(255);
1.255 reyk 861: }
862: break;
1.331 dtucker 863: case 'W':
1.441 dtucker 864: if (options.stdio_forward_host != NULL)
1.332 djm 865: fatal("stdio forward already specified");
866: if (muxclient_command != 0)
867: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 868: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 869: options.stdio_forward_host = fwd.listen_host;
870: options.stdio_forward_port = fwd.listen_port;
1.378 djm 871: free(fwd.connect_host);
1.331 dtucker 872: } else {
873: fprintf(stderr,
874: "Bad stdio forwarding specification '%s'\n",
875: optarg);
876: exit(255);
877: }
1.359 djm 878: options.request_tty = REQUEST_TTY_NO;
1.560 djm 879: options.session_type = SESSION_TYPE_NONE;
1.331 dtucker 880: break;
1.31 markus 881: case 'q':
882: options.log_level = SYSLOG_LEVEL_QUIET;
883: break;
884: case 'e':
885: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 886: (u_char) optarg[1] >= 64 &&
887: (u_char) optarg[1] < 128)
1.78 markus 888: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 889: else if (strlen(optarg) == 1)
1.78 markus 890: options.escape_char = (u_char) optarg[0];
1.31 markus 891: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 892: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 893: else {
1.128 fgsch 894: fprintf(stderr, "Bad escape character '%s'.\n",
895: optarg);
1.257 dtucker 896: exit(255);
1.31 markus 897: }
898: break;
899: case 'c':
1.506 naddy 900: if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
1.420 djm 901: optarg + 1 : optarg)) {
902: fprintf(stderr, "Unknown cipher type '%s'\n",
903: optarg);
904: exit(255);
1.95 markus 905: }
1.456 djm 906: free(options.ciphers);
907: options.ciphers = xstrdup(optarg);
1.95 markus 908: break;
909: case 'm':
1.422 dtucker 910: if (mac_valid(optarg)) {
911: free(options.macs);
1.95 markus 912: options.macs = xstrdup(optarg);
1.422 dtucker 913: } else {
1.128 fgsch 914: fprintf(stderr, "Unknown mac type '%s'\n",
915: optarg);
1.257 dtucker 916: exit(255);
1.31 markus 917: }
918: break;
1.214 djm 919: case 'M':
1.242 djm 920: if (options.control_master == SSHCTL_MASTER_YES)
921: options.control_master = SSHCTL_MASTER_ASK;
922: else
923: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 924: break;
1.31 markus 925: case 'p':
1.465 millert 926: if (options.port == -1) {
927: options.port = a2port(optarg);
928: if (options.port <= 0) {
929: fprintf(stderr, "Bad port '%s'\n",
930: optarg);
931: exit(255);
932: }
1.109 markus 933: }
1.31 markus 934: break;
935: case 'l':
1.465 millert 936: if (options.user == NULL)
937: options.user = optarg;
1.31 markus 938: break;
1.141 stevesk 939:
940: case 'L':
1.324 djm 941: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 942: add_local_forward(&options, &fwd);
943: else {
1.128 fgsch 944: fprintf(stderr,
1.232 djm 945: "Bad local forwarding specification '%s'\n",
1.128 fgsch 946: optarg);
1.257 dtucker 947: exit(255);
1.31 markus 948: }
1.232 djm 949: break;
950:
951: case 'R':
1.464 markus 952: if (parse_forward(&fwd, optarg, 0, 1) ||
953: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 954: add_remote_forward(&options, &fwd);
955: } else {
1.128 fgsch 956: fprintf(stderr,
1.232 djm 957: "Bad remote forwarding specification "
958: "'%s'\n", optarg);
1.257 dtucker 959: exit(255);
1.31 markus 960: }
961: break;
1.108 markus 962:
963: case 'D':
1.324 djm 964: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 965: add_local_forward(&options, &fwd);
1.232 djm 966: } else {
1.322 stevesk 967: fprintf(stderr,
968: "Bad dynamic forwarding specification "
969: "'%s'\n", optarg);
1.257 dtucker 970: exit(255);
1.109 markus 971: }
1.108 markus 972: break;
973:
1.31 markus 974: case 'C':
1.513 dtucker 975: #ifdef WITH_ZLIB
1.31 markus 976: options.compression = 1;
1.513 dtucker 977: #else
978: error("Compression not supported, disabling.");
979: #endif
1.31 markus 980: break;
1.45 markus 981: case 'N':
1.560 djm 982: if (options.session_type != -1 &&
983: options.session_type != SESSION_TYPE_NONE)
984: fatal("Cannot specify -N with -s/SessionType");
985: options.session_type = SESSION_TYPE_NONE;
1.359 djm 986: options.request_tty = REQUEST_TTY_NO;
1.45 markus 987: break;
988: case 'T':
1.359 djm 989: options.request_tty = REQUEST_TTY_NO;
1.45 markus 990: break;
1.31 markus 991: case 'o':
1.205 markus 992: line = xstrdup(optarg);
1.408 djm 993: if (process_config_line(&options, pw,
994: host ? host : "", host ? host : "", line,
995: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 996: exit(255);
1.378 djm 997: free(line);
1.31 markus 998: break;
1.85 djm 999: case 's':
1.560 djm 1000: if (options.session_type != -1 &&
1001: options.session_type != SESSION_TYPE_SUBSYSTEM)
1002: fatal("Cannot specify -s with -N/SessionType");
1003: options.session_type = SESSION_TYPE_SUBSYSTEM;
1.117 markus 1004: break;
1.214 djm 1005: case 'S':
1.431 mmcc 1006: free(options.control_path);
1.214 djm 1007: options.control_path = xstrdup(optarg);
1008: break;
1.117 markus 1009: case 'b':
1010: options.bind_address = optarg;
1.474 djm 1011: break;
1012: case 'B':
1013: options.bind_interface = optarg;
1.85 djm 1014: break;
1.139 markus 1015: case 'F':
1016: config = optarg;
1017: break;
1.31 markus 1018: default:
1019: usage();
1.1 deraadt 1020: }
1.31 markus 1021: }
1022:
1.462 djm 1023: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
1024: opt_terminated = 1;
1025:
1.128 fgsch 1026: ac -= optind;
1027: av += optind;
1028:
1.329 guenther 1029: if (ac > 0 && !host) {
1.465 millert 1030: int tport;
1031: char *tuser;
1032: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
1033: case -1:
1034: usage();
1035: break;
1036: case 0:
1037: if (options.user == NULL) {
1038: options.user = tuser;
1039: tuser = NULL;
1040: }
1041: free(tuser);
1042: if (options.port == -1 && tport != -1)
1043: options.port = tport;
1044: break;
1045: default:
1.128 fgsch 1046: p = xstrdup(*av);
1.188 markus 1047: cp = strrchr(p, '@');
1.465 millert 1048: if (cp != NULL) {
1049: if (cp == p)
1050: usage();
1051: if (options.user == NULL) {
1052: options.user = p;
1053: p = NULL;
1054: }
1055: *cp++ = '\0';
1056: host = xstrdup(cp);
1057: free(p);
1058: } else
1059: host = p;
1060: break;
1061: }
1.462 djm 1062: if (ac > 1 && !opt_terminated) {
1.189 millert 1063: optind = optreset = 1;
1.128 fgsch 1064: goto again;
1065: }
1.189 millert 1066: ac--, av++;
1.128 fgsch 1067: }
1068:
1.31 markus 1069: /* Check that we got a host name. */
1070: if (!host)
1071: usage();
1072:
1.385 djm 1073: host_arg = xstrdup(host);
1074:
1.402 markus 1075: #ifdef WITH_OPENSSL
1.350 djm 1076: OpenSSL_add_all_algorithms();
1.72 markus 1077: ERR_load_crypto_strings();
1.402 markus 1078: #endif
1.31 markus 1079:
1080: /* Initialize the command to execute on remote host. */
1.482 markus 1081: if ((command = sshbuf_new()) == NULL)
1082: fatal("sshbuf_new failed");
1.1 deraadt 1083:
1.33 markus 1084: /*
1085: * Save the command to execute on the remote host in a buffer. There
1086: * is no limit on the length of the command, except by the maximum
1087: * packet size. Also sets the tty flag if there is no command.
1088: */
1.128 fgsch 1089: if (!ac) {
1.31 markus 1090: /* No command specified - execute shell on a tty. */
1.560 djm 1091: if (options.session_type == SESSION_TYPE_SUBSYSTEM) {
1.128 fgsch 1092: fprintf(stderr,
1093: "You must specify a subsystem to invoke.\n");
1.85 djm 1094: usage();
1095: }
1.31 markus 1096: } else {
1.128 fgsch 1097: /* A command has been specified. Store it into the buffer. */
1098: for (i = 0; i < ac; i++) {
1.482 markus 1099: if ((r = sshbuf_putf(command, "%s%s",
1100: i ? " " : "", av[i])) != 0)
1.540 djm 1101: fatal_fr(r, "buffer error");
1.31 markus 1102: }
1103: }
1104:
1.101 markus 1105: /*
1106: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1107: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1108: */
1.375 dtucker 1109: if (use_syslog && logfile != NULL)
1110: fatal("Can't specify both -y and -E");
1.422 dtucker 1111: if (logfile != NULL)
1.375 dtucker 1112: log_redirect_stderr_to(logfile);
1.325 markus 1113: log_init(argv0,
1.468 djm 1114: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1115: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1116: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1117: SYSLOG_FACILITY_USER : options.log_facility,
1118: !use_syslog);
1.375 dtucker 1119:
1120: if (debug_flag)
1.541 dtucker 1121: logit("%s, %s", SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 1122:
1.400 djm 1123: /* Parse the configuration files */
1.496 djm 1124: process_config_files(host_arg, pw, 0, &want_final_pass);
1125: if (want_final_pass)
1126: debug("configuration requests final Match pass");
1.400 djm 1127:
1128: /* Hostname canonicalisation needs a few options filled. */
1129: fill_default_options_for_canonicalization(&options);
1130:
1131: /* If the user has replaced the hostname then take it into use now */
1132: if (options.hostname != NULL) {
1133: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1134: cp = percent_expand(options.hostname,
1135: "h", host, (char *)NULL);
1136: free(host);
1137: host = cp;
1.408 djm 1138: free(options.hostname);
1139: options.hostname = xstrdup(host);
1.400 djm 1140: }
1141:
1.470 djm 1142: /* Don't lowercase addresses, they will be explicitly canonicalised */
1143: if ((was_addr = is_addr(host)) == 0)
1144: lowercase(host);
1145:
1146: /*
1147: * Try to canonicalize if requested by configuration or the
1148: * hostname is an address.
1149: */
1150: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1151: addrs = resolve_canonicalize(&host, options.port);
1152:
1.139 markus 1153: /*
1.401 djm 1154: * If CanonicalizePermittedCNAMEs have been specified but
1155: * other canonicalization did not happen (by not being requested
1156: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1157: * as a result of CNAME following.
1.401 djm 1158: *
1159: * Try to resolve the bare hostname name using the system resolver's
1160: * usual search rules and then apply the CNAME follow rules.
1161: *
1162: * Skip the lookup if a ProxyCommand is being used unless the user
1163: * has specifically requested canonicalisation for this case via
1164: * CanonicalizeHostname=always
1.139 markus 1165: */
1.443 djm 1166: direct = option_clear_or_none(options.proxy_command) &&
1167: options.jump_host == NULL;
1168: if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1169: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1170: if ((addrs = resolve_host(host, options.port,
1.493 djm 1171: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1172: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1173: if (direct)
1.403 djm 1174: cleanup_exit(255); /* logged in resolve_host */
1175: } else
1.443 djm 1176: check_follow_cname(direct, &host, cname);
1.400 djm 1177: }
1.139 markus 1178:
1.400 djm 1179: /*
1.408 djm 1180: * If canonicalisation is enabled then re-parse the configuration
1181: * files as new stanzas may match.
1.400 djm 1182: */
1.496 djm 1183: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1184: debug("hostname canonicalisation enabled, "
1185: "will re-parse configuration");
1186: want_final_pass = 1;
1187: }
1188:
1189: if (want_final_pass) {
1190: debug("re-parsing configuration");
1.408 djm 1191: free(options.hostname);
1192: options.hostname = xstrdup(host);
1.496 djm 1193: process_config_files(host_arg, pw, 1, NULL);
1.408 djm 1194: /*
1195: * Address resolution happens early with canonicalisation
1196: * enabled and the port number may have changed since, so
1197: * reset it in address list
1198: */
1199: if (addrs != NULL && options.port > 0)
1200: set_addrinfo_port(addrs, options.port);
1.139 markus 1201: }
1.31 markus 1202:
1203: /* Fill configuration defaults. */
1.543 djm 1204: if (fill_default_options(&options) != 0)
1205: cleanup_exit(255);
1.443 djm 1206:
1.534 dtucker 1207: if (options.user == NULL)
1208: options.user = xstrdup(pw->pw_name);
1209:
1.443 djm 1210: /*
1211: * If ProxyJump option specified, then construct a ProxyCommand now.
1212: */
1213: if (options.jump_host != NULL) {
1214: char port_s[8];
1.534 dtucker 1215: const char *jumpuser = options.jump_user, *sshbin = argv0;
1.520 dtucker 1216: int port = options.port, jumpport = options.jump_port;
1217:
1218: if (port <= 0)
1219: port = default_ssh_port();
1220: if (jumpport <= 0)
1221: jumpport = default_ssh_port();
1.534 dtucker 1222: if (jumpuser == NULL)
1223: jumpuser = options.user;
1224: if (strcmp(options.jump_host, host) == 0 && port == jumpport &&
1225: strcmp(options.user, jumpuser) == 0)
1.520 dtucker 1226: fatal("jumphost loop via %s", options.jump_host);
1.478 djm 1227:
1228: /*
1229: * Try to use SSH indicated by argv[0], but fall back to
1230: * "ssh" if it appears unavailable.
1231: */
1232: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1233: sshbin = "ssh";
1.443 djm 1234:
1235: /* Consistency check */
1236: if (options.proxy_command != NULL)
1237: fatal("inconsistent options: ProxyCommand+ProxyJump");
1238: /* Never use FD passing for ProxyJump */
1239: options.proxy_use_fdpass = 0;
1240: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1241: xasprintf(&options.proxy_command,
1.478 djm 1242: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1243: sshbin,
1.443 djm 1244: /* Optional "-l user" argument if jump_user set */
1245: options.jump_user == NULL ? "" : " -l ",
1246: options.jump_user == NULL ? "" : options.jump_user,
1247: /* Optional "-p port" argument if jump_port set */
1248: options.jump_port <= 0 ? "" : " -p ",
1249: options.jump_port <= 0 ? "" : port_s,
1250: /* Optional additional jump hosts ",..." */
1251: options.jump_extra == NULL ? "" : " -J ",
1252: options.jump_extra == NULL ? "" : options.jump_extra,
1253: /* Optional "-F" argumment if -F specified */
1254: config == NULL ? "" : " -F ",
1255: config == NULL ? "" : config,
1256: /* Optional "-v" arguments if -v set */
1257: debug_flag ? " -" : "",
1258: debug_flag, "vvv",
1259: /* Mandatory hostname */
1260: options.jump_host);
1261: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1262: options.proxy_command);
1263: }
1.31 markus 1264:
1.400 djm 1265: if (options.port == 0)
1266: options.port = default_ssh_port();
1.463 djm 1267: channel_set_af(ssh, options.address_family);
1.196 djm 1268:
1.383 djm 1269: /* Tidy and check options */
1270: if (options.host_key_alias != NULL)
1271: lowercase(options.host_key_alias);
1272: if (options.proxy_command != NULL &&
1273: strcmp(options.proxy_command, "-") == 0 &&
1274: options.proxy_use_fdpass)
1275: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.516 markus 1276: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1277: if (options.control_persist && options.control_path != NULL) {
1278: debug("UpdateHostKeys=ask is incompatible with "
1279: "ControlPersist; disabling");
1280: options.update_hostkeys = 0;
1281: } else if (sshbuf_len(command) != 0 ||
1282: options.remote_command != NULL ||
1283: options.request_tty == REQUEST_TTY_NO) {
1284: debug("UpdateHostKeys=ask is incompatible with "
1285: "remote command execution; disabling");
1.517 djm 1286: options.update_hostkeys = 0;
1287: } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1288: /* no point logging anything; user won't see it */
1.516 markus 1289: options.update_hostkeys = 0;
1290: }
1.415 djm 1291: }
1.430 djm 1292: if (options.connection_attempts <= 0)
1293: fatal("Invalid number of ConnectionAttempts");
1294:
1.482 markus 1295: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1296: fatal("Cannot execute command-line and remote command.");
1297:
1298: /* Cannot fork to background if no command. */
1.564 djm 1299: if (options.fork_after_authentication && sshbuf_len(command) == 0 &&
1.562 djm 1300: options.remote_command == NULL &&
1301: options.session_type != SESSION_TYPE_NONE)
1.461 bluhm 1302: fatal("Cannot fork into background without a command "
1303: "to execute.");
1304:
1.31 markus 1305: /* reinit */
1.452 dtucker 1306: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.559 djm 1307: for (j = 0; j < options.num_log_verbose; j++) {
1308: if (strcasecmp(options.log_verbose[j], "none") == 0)
1309: break;
1.539 djm 1310: log_verbose_add(options.log_verbose[j]);
1.559 djm 1311: }
1.370 djm 1312:
1313: if (options.request_tty == REQUEST_TTY_YES ||
1314: options.request_tty == REQUEST_TTY_FORCE)
1315: tty_flag = 1;
1316:
1317: /* Allocate a tty by default if no command specified. */
1.482 markus 1318: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1319: tty_flag = options.request_tty != REQUEST_TTY_NO;
1320:
1321: /* Force no tty */
1.447 markus 1322: if (options.request_tty == REQUEST_TTY_NO ||
1323: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
1.370 djm 1324: tty_flag = 0;
1325: /* Do not allocate a tty if stdin is not a tty. */
1.563 djm 1326: if ((!isatty(fileno(stdin)) || options.stdin_null) &&
1.370 djm 1327: options.request_tty != REQUEST_TTY_FORCE) {
1328: if (tty_flag)
1329: logit("Pseudo-terminal will not be allocated because "
1330: "stdin is not a terminal.");
1331: tty_flag = 0;
1332: }
1.343 djm 1333:
1.466 djm 1334: /* Set up strings used to percent_expand() arguments */
1.544 djm 1335: cinfo = xcalloc(1, sizeof(*cinfo));
1.358 djm 1336: if (gethostname(thishost, sizeof(thishost)) == -1)
1337: fatal("gethostname: %s", strerror(errno));
1.544 djm 1338: cinfo->thishost = xstrdup(thishost);
1339: thishost[strcspn(thishost, ".")] = '\0';
1340: cinfo->shorthost = xstrdup(thishost);
1341: xasprintf(&cinfo->portstr, "%d", options.port);
1342: xasprintf(&cinfo->uidstr, "%llu",
1.479 djm 1343: (unsigned long long)pw->pw_uid);
1.544 djm 1344: cinfo->keyalias = xstrdup(options.host_key_alias ?
1345: options.host_key_alias : host_arg);
1346: cinfo->conn_hash_hex = ssh_connection_hash(cinfo->thishost, host,
1347: cinfo->portstr, options.user);
1348: cinfo->host_arg = xstrdup(host_arg);
1349: cinfo->remhost = xstrdup(host);
1350: cinfo->remuser = xstrdup(options.user);
1351: cinfo->homedir = xstrdup(pw->pw_dir);
1352: cinfo->locuser = xstrdup(pw->pw_name);
1.405 djm 1353:
1.466 djm 1354: /*
1355: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1356: * after port-forwarding is set up, so it may pick up any local
1357: * tunnel interface name allocated.
1358: */
1.461 bluhm 1359: if (options.remote_command != NULL) {
1360: debug3("expanding RemoteCommand: %s", options.remote_command);
1361: cp = options.remote_command;
1.527 dtucker 1362: options.remote_command = default_client_percent_expand(cp,
1.544 djm 1363: cinfo);
1.461 bluhm 1364: debug3("expanded RemoteCommand: %s", options.remote_command);
1365: free(cp);
1.482 markus 1366: if ((r = sshbuf_put(command, options.remote_command,
1367: strlen(options.remote_command))) != 0)
1.540 djm 1368: fatal_fr(r, "buffer error");
1.304 dtucker 1369: }
1.31 markus 1370:
1.214 djm 1371: if (options.control_path != NULL) {
1.490 dtucker 1372: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1373: free(options.control_path);
1.528 dtucker 1374: options.control_path = default_client_percent_dollar_expand(cp,
1.544 djm 1375: cinfo);
1.378 djm 1376: free(cp);
1.214 djm 1377: }
1.408 djm 1378:
1.522 dtucker 1379: if (options.identity_agent != NULL) {
1380: p = tilde_expand_filename(options.identity_agent, getuid());
1.544 djm 1381: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1382: free(p);
1383: free(options.identity_agent);
1384: options.identity_agent = cp;
1385: }
1386:
1387: if (options.forward_agent_sock_path != NULL) {
1388: p = tilde_expand_filename(options.forward_agent_sock_path,
1389: getuid());
1.544 djm 1390: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1391: free(p);
1392: free(options.forward_agent_sock_path);
1393: options.forward_agent_sock_path = cp;
1.552 djm 1394: if (stat(options.forward_agent_sock_path, &st) != 0) {
1395: error("Cannot forward agent socket path \"%s\": %s",
1396: options.forward_agent_sock_path, strerror(errno));
1397: if (options.exit_on_forward_failure)
1398: cleanup_exit(255);
1399: }
1.532 dtucker 1400: }
1401:
1.545 djm 1402: if (options.num_system_hostfiles > 0 &&
1403: strcasecmp(options.system_hostfiles[0], "none") == 0) {
1404: if (options.num_system_hostfiles > 1)
1405: fatal("Invalid GlobalKnownHostsFiles: \"none\" "
1406: "appears with other entries");
1407: free(options.system_hostfiles[0]);
1408: options.system_hostfiles[0] = NULL;
1409: options.num_system_hostfiles = 0;
1410: }
1411:
1412: if (options.num_user_hostfiles > 0 &&
1413: strcasecmp(options.user_hostfiles[0], "none") == 0) {
1414: if (options.num_user_hostfiles > 1)
1415: fatal("Invalid UserKnownHostsFiles: \"none\" "
1416: "appears with other entries");
1417: free(options.user_hostfiles[0]);
1418: options.user_hostfiles[0] = NULL;
1419: options.num_user_hostfiles = 0;
1420: }
1.532 dtucker 1421: for (j = 0; j < options.num_user_hostfiles; j++) {
1.545 djm 1422: if (options.user_hostfiles[j] == NULL)
1423: continue;
1424: cp = tilde_expand_filename(options.user_hostfiles[j], getuid());
1425: p = default_client_percent_dollar_expand(cp, cinfo);
1426: if (strcmp(options.user_hostfiles[j], p) != 0)
1427: debug3("expanded UserKnownHostsFile '%s' -> "
1428: "'%s'", options.user_hostfiles[j], p);
1429: free(options.user_hostfiles[j]);
1430: free(cp);
1431: options.user_hostfiles[j] = p;
1.522 dtucker 1432: }
1433:
1.527 dtucker 1434: for (i = 0; i < options.num_local_forwards; i++) {
1435: if (options.local_forwards[i].listen_path != NULL) {
1436: cp = options.local_forwards[i].listen_path;
1437: p = options.local_forwards[i].listen_path =
1.544 djm 1438: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1439: if (strcmp(cp, p) != 0)
1440: debug3("expanded LocalForward listen path "
1441: "'%s' -> '%s'", cp, p);
1442: free(cp);
1443: }
1444: if (options.local_forwards[i].connect_path != NULL) {
1445: cp = options.local_forwards[i].connect_path;
1446: p = options.local_forwards[i].connect_path =
1.544 djm 1447: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1448: if (strcmp(cp, p) != 0)
1449: debug3("expanded LocalForward connect path "
1450: "'%s' -> '%s'", cp, p);
1451: free(cp);
1452: }
1453: }
1454:
1455: for (i = 0; i < options.num_remote_forwards; i++) {
1456: if (options.remote_forwards[i].listen_path != NULL) {
1457: cp = options.remote_forwards[i].listen_path;
1458: p = options.remote_forwards[i].listen_path =
1.544 djm 1459: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1460: if (strcmp(cp, p) != 0)
1461: debug3("expanded RemoteForward listen path "
1462: "'%s' -> '%s'", cp, p);
1463: free(cp);
1464: }
1465: if (options.remote_forwards[i].connect_path != NULL) {
1466: cp = options.remote_forwards[i].connect_path;
1467: p = options.remote_forwards[i].connect_path =
1.544 djm 1468: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1469: if (strcmp(cp, p) != 0)
1470: debug3("expanded RemoteForward connect path "
1471: "'%s' -> '%s'", cp, p);
1472: free(cp);
1473: }
1474: }
1475:
1.408 djm 1476: if (config_test) {
1477: dump_client_config(&options, host);
1478: exit(0);
1.508 djm 1479: }
1480:
1481: /* Expand SecurityKeyProvider if it refers to an environment variable */
1482: if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1483: strlen(options.sk_provider) > 1) {
1484: if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1.518 naddy 1485: debug("Authenticator provider %s did not resolve; "
1.508 djm 1486: "disabling", options.sk_provider);
1487: free(options.sk_provider);
1488: options.sk_provider = NULL;
1489: } else {
1490: debug2("resolved SecurityKeyProvider %s => %s",
1491: options.sk_provider, cp);
1492: free(options.sk_provider);
1493: options.sk_provider = xstrdup(cp);
1494: }
1.408 djm 1495: }
1.405 djm 1496:
1.312 djm 1497: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1498: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1499: if (options.control_path != NULL) {
1500: int sock;
1501: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1502: ssh_packet_set_connection(ssh, sock, sock);
1.499 djm 1503: ssh_packet_set_mux(ssh);
1.447 markus 1504: goto skip_connect;
1505: }
1506: }
1.401 djm 1507:
1508: /*
1509: * If hostname canonicalisation was not enabled, then we may not
1510: * have yet resolved the hostname. Do so now.
1511: */
1512: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1513: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1514: if ((addrs = resolve_host(host, options.port, 1,
1515: cname, sizeof(cname))) == NULL)
1516: cleanup_exit(255); /* resolve_host logs the error */
1517: }
1.214 djm 1518:
1.542 dtucker 1519: if (options.connection_timeout >= INT_MAX/1000)
1520: timeout_ms = INT_MAX;
1521: else
1522: timeout_ms = options.connection_timeout * 1000;
1.303 djm 1523:
1.77 markus 1524: /* Open a connection to the remote host. */
1.511 beck 1525: if (ssh_connect(ssh, host, host_arg, addrs, &hostaddr, options.port,
1.538 kn 1526: options.connection_attempts,
1.488 dtucker 1527: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1528: exit(255);
1.31 markus 1529:
1.391 djm 1530: if (addrs != NULL)
1531: freeaddrinfo(addrs);
1532:
1.499 djm 1533: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1534: options.server_alive_count_max);
1535:
1.303 djm 1536: if (timeout_ms > 0)
1537: debug3("timeout: %d ms remain after connect", timeout_ms);
1538:
1.33 markus 1539: /*
1.485 dtucker 1540: * If we successfully made the connection and we have hostbased auth
1541: * enabled, load the public keys so we can later use the ssh-keysign
1542: * helper to sign challenges.
1.33 markus 1543: */
1.112 markus 1544: sensitive_data.nkeys = 0;
1545: sensitive_data.keys = NULL;
1.457 djm 1546: if (options.hostbased_authentication) {
1.486 dtucker 1547: sensitive_data.nkeys = 10;
1.274 deraadt 1548: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.483 markus 1549: sizeof(struct sshkey));
1550:
1551: /* XXX check errors? */
1.486 dtucker 1552: #define L_PUBKEY(p,o) do { \
1553: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1554: fatal_f("pubkey out of array bounds"); \
1.483 markus 1555: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.486 dtucker 1556: p, "pubkey"); \
1557: } while (0)
1558: #define L_CERT(p,o) do { \
1559: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1560: fatal_f("cert out of array bounds"); \
1.486 dtucker 1561: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), p, "cert"); \
1562: } while (0)
1.177 markus 1563:
1.485 dtucker 1564: if (options.hostbased_authentication == 1) {
1.486 dtucker 1565: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1566: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1567: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1568: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1569: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1570: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1571: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1572: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1573: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1574: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.173 markus 1575: }
1.367 djm 1576: }
1.31 markus 1577:
1.104 markus 1578: /* load options.identity_files */
1.544 djm 1579: load_public_identity_files(cinfo);
1.439 markus 1580:
1.476 djm 1581: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1582: if (options.identity_agent &&
1583: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1584: if (strcmp(options.identity_agent, "none") == 0) {
1585: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1586: } else {
1.522 dtucker 1587: cp = options.identity_agent;
1.528 dtucker 1588: /* legacy (limited) format */
1589: if (cp[0] == '$' && cp[1] != '{') {
1.494 djm 1590: if (!valid_env_name(cp + 1)) {
1591: fatal("Invalid IdentityAgent "
1592: "environment variable name %s", cp);
1593: }
1594: if ((p = getenv(cp + 1)) == NULL)
1595: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1596: else
1597: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1598: } else {
1599: /* identity_agent specifies a path directly */
1600: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1601: }
1.510 djm 1602: }
1603: }
1604:
1.522 dtucker 1605: if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1.526 djm 1606: cp = options.forward_agent_sock_path;
1.510 djm 1607: if (cp[0] == '$') {
1608: if (!valid_env_name(cp + 1)) {
1609: fatal("Invalid ForwardAgent environment variable name %s", cp);
1610: }
1611: if ((p = getenv(cp + 1)) != NULL)
1612: forward_agent_sock_path = p;
1613: else
1614: options.forward_agent = 0;
1615: free(cp);
1616: } else {
1617: forward_agent_sock_path = cp;
1.439 markus 1618: }
1619: }
1.104 markus 1620:
1621: /* Expand ~ in known host file names. */
1.361 djm 1622: tilde_expand_paths(options.system_hostfiles,
1623: options.num_system_hostfiles);
1624: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1625:
1.512 dtucker 1626: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1627: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1628:
1.316 djm 1629: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1630: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.546 djm 1631: options.port, pw, timeout_ms, cinfo);
1.31 markus 1632:
1.112 markus 1633: /* We no longer need the private host keys. Clear them now. */
1634: if (sensitive_data.nkeys != 0) {
1635: for (i = 0; i < sensitive_data.nkeys; i++) {
1636: if (sensitive_data.keys[i] != NULL) {
1637: /* Destroys contents safely */
1638: debug3("clear hostkey %d", i);
1.483 markus 1639: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1640: sensitive_data.keys[i] = NULL;
1641: }
1642: }
1.378 djm 1643: free(sensitive_data.keys);
1.134 markus 1644: }
1645: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1646: free(options.identity_files[i]);
1647: options.identity_files[i] = NULL;
1.134 markus 1648: if (options.identity_keys[i]) {
1.483 markus 1649: sshkey_free(options.identity_keys[i]);
1.134 markus 1650: options.identity_keys[i] = NULL;
1651: }
1.112 markus 1652: }
1.426 djm 1653: for (i = 0; i < options.num_certificate_files; i++) {
1654: free(options.certificate_files[i]);
1655: options.certificate_files[i] = NULL;
1656: }
1.553 djm 1657:
1658: #ifdef ENABLE_PKCS11
1659: (void)pkcs11_del_provider(options.pkcs11_provider);
1660: #endif
1.31 markus 1661:
1.447 markus 1662: skip_connect:
1.544 djm 1663: exit_status = ssh_session2(ssh, cinfo);
1664: ssh_conn_info_free(cinfo);
1.499 djm 1665: ssh_packet_close(ssh);
1.186 djm 1666:
1.312 djm 1667: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1668: unlink(options.control_path);
1669:
1.353 djm 1670: /* Kill ProxyCommand if it is running. */
1671: ssh_kill_proxy_command();
1.186 djm 1672:
1.45 markus 1673: return exit_status;
1674: }
1675:
1.344 djm 1676: static void
1677: control_persist_detach(void)
1678: {
1679: pid_t pid;
1680:
1.540 djm 1681: debug_f("backgrounding master process");
1.344 djm 1682:
1.473 djm 1683: /*
1684: * master (current process) into the background, and make the
1685: * foreground process a client of the backgrounded master.
1686: */
1.344 djm 1687: switch ((pid = fork())) {
1688: case -1:
1.540 djm 1689: fatal_f("fork: %s", strerror(errno));
1.344 djm 1690: case 0:
1691: /* Child: master process continues mainloop */
1.473 djm 1692: break;
1693: default:
1.531 djm 1694: /* Parent: set up mux client to connect to backgrounded master */
1.540 djm 1695: debug2_f("background process is %ld", (long)pid);
1.563 djm 1696: options.stdin_null = ostdin_null_flag;
1.359 djm 1697: options.request_tty = orequest_tty;
1.344 djm 1698: tty_flag = otty_flag;
1.561 djm 1699: options.session_type = osession_type;
1.473 djm 1700: close(muxserver_sock);
1701: muxserver_sock = -1;
1.351 markus 1702: options.control_master = SSHCTL_MASTER_NO;
1.473 djm 1703: muxclient(options.control_path);
1.344 djm 1704: /* muxclient() doesn't return on success. */
1.473 djm 1705: fatal("Failed to connect to new control master");
1706: }
1.537 djm 1707: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1708: error_f("stdfd_devnull failed");
1.381 djm 1709: daemon(1, 1);
1.362 djm 1710: setproctitle("%s [mux]", options.control_path);
1.344 djm 1711: }
1712:
1713: /* Do fork() after authentication. Used by "ssh -f" */
1714: static void
1715: fork_postauth(void)
1716: {
1717: if (need_controlpersist_detach)
1718: control_persist_detach();
1719: debug("forking to background");
1.564 djm 1720: options.fork_after_authentication = 0;
1.505 deraadt 1721: if (daemon(1, 1) == -1)
1.344 djm 1722: fatal("daemon() failed: %.200s", strerror(errno));
1.537 djm 1723: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1724: error_f("stdfd_devnull failed");
1.344 djm 1725: }
1726:
1.523 djm 1727: static void
1728: forwarding_success(void)
1729: {
1.524 djm 1730: if (forward_confirms_pending == -1)
1731: return;
1732: if (--forward_confirms_pending == 0) {
1.540 djm 1733: debug_f("all expected forwarding replies received");
1.564 djm 1734: if (options.fork_after_authentication)
1.523 djm 1735: fork_postauth();
1.524 djm 1736: } else {
1.540 djm 1737: debug2_f("%d expected forwarding replies remaining",
1738: forward_confirms_pending);
1.523 djm 1739: }
1740: }
1741:
1.315 djm 1742: /* Callback for remote forward global requests */
1743: static void
1.463 djm 1744: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1745: {
1.406 millert 1746: struct Forward *rfwd = (struct Forward *)ctxt;
1.499 djm 1747: u_int port;
1748: int r;
1.315 djm 1749:
1.324 djm 1750: /* XXX verbose() on failure? */
1.404 markus 1751: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1752: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1753: rfwd->listen_path ? rfwd->listen_path :
1754: rfwd->listen_host ? rfwd->listen_host : "",
1755: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1756: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1757: rfwd->connect_host, rfwd->connect_port);
1758: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1759: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1.499 djm 1760: if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1.540 djm 1761: fatal_fr(r, "parse packet");
1.499 djm 1762: if (port > 65535) {
1763: error("Invalid allocated port %u for remote "
1764: "forward to %s:%d", port,
1765: rfwd->connect_host, rfwd->connect_port);
1766: /* Ensure failure processing runs below */
1767: type = SSH2_MSG_REQUEST_FAILURE;
1768: channel_update_permission(ssh,
1769: rfwd->handle, -1);
1770: } else {
1771: rfwd->allocated_port = (int)port;
1772: logit("Allocated port %u for remote "
1773: "forward to %s:%d",
1774: rfwd->allocated_port, rfwd->connect_host,
1775: rfwd->connect_port);
1776: channel_update_permission(ssh,
1777: rfwd->handle, rfwd->allocated_port);
1778: }
1.366 markus 1779: } else {
1.480 djm 1780: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1781: }
1.324 djm 1782: }
1.468 djm 1783:
1.315 djm 1784: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1785: if (options.exit_on_forward_failure) {
1786: if (rfwd->listen_path != NULL)
1787: fatal("Error: remote port forwarding failed "
1788: "for listen path %s", rfwd->listen_path);
1789: else
1790: fatal("Error: remote port forwarding failed "
1791: "for listen port %d", rfwd->listen_port);
1792: } else {
1793: if (rfwd->listen_path != NULL)
1794: logit("Warning: remote port forwarding failed "
1795: "for listen path %s", rfwd->listen_path);
1796: else
1797: logit("Warning: remote port forwarding failed "
1798: "for listen port %d", rfwd->listen_port);
1799: }
1.315 djm 1800: }
1.523 djm 1801: forwarding_success();
1.315 djm 1802: }
1803:
1.126 itojun 1804: static void
1.463 djm 1805: client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
1.331 dtucker 1806: {
1807: debug("stdio forwarding: done");
1808: cleanup_exit(0);
1809: }
1810:
1.368 djm 1811: static void
1.463 djm 1812: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1813: {
1814: if (!success)
1815: fatal("stdio forwarding failed");
1816: }
1817:
1818: static void
1.523 djm 1819: ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
1820: {
1821: if (!success) {
1822: error("Tunnel forwarding failed");
1823: if (options.exit_on_forward_failure)
1824: cleanup_exit(255);
1825: }
1826:
1.540 djm 1827: debug_f("tunnel forward established, id=%d", id);
1.523 djm 1828: forwarding_success();
1829: }
1830:
1831: static void
1.463 djm 1832: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1833: {
1834: Channel *c;
1.332 djm 1835: int in, out;
1.331 dtucker 1836:
1.441 dtucker 1837: if (options.stdio_forward_host == NULL)
1.368 djm 1838: return;
1839:
1.540 djm 1840: debug3_f("%s:%d", options.stdio_forward_host,
1.441 dtucker 1841: options.stdio_forward_port);
1.332 djm 1842:
1.505 deraadt 1843: if ((in = dup(STDIN_FILENO)) == -1 ||
1844: (out = dup(STDOUT_FILENO)) == -1)
1.557 djm 1845: fatal_f("dup() in/out failed");
1.463 djm 1846: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.557 djm 1847: options.stdio_forward_port, in, out,
1848: CHANNEL_NONBLOCK_STDIO)) == NULL)
1.540 djm 1849: fatal_f("channel_connect_stdio_fwd failed");
1.463 djm 1850: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1851: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1852: }
1853:
1854: static void
1.551 markus 1855: ssh_init_forward_permissions(struct ssh *ssh, const char *what, char **opens,
1856: u_int num_opens)
1857: {
1858: u_int i;
1859: int port;
1860: char *addr, *arg, *oarg, ch;
1861: int where = FORWARD_LOCAL;
1862:
1863: channel_clear_permission(ssh, FORWARD_ADM, where);
1864: if (num_opens == 0)
1865: return; /* permit any */
1866:
1867: /* handle keywords: "any" / "none" */
1868: if (num_opens == 1 && strcmp(opens[0], "any") == 0)
1869: return;
1870: if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
1871: channel_disable_admin(ssh, where);
1872: return;
1873: }
1874: /* Otherwise treat it as a list of permitted host:port */
1875: for (i = 0; i < num_opens; i++) {
1876: oarg = arg = xstrdup(opens[i]);
1877: ch = '\0';
1878: addr = hpdelim2(&arg, &ch);
1879: if (addr == NULL || ch == '/')
1880: fatal_f("missing host in %s", what);
1881: addr = cleanhostname(addr);
1882: if (arg == NULL || ((port = permitopen_port(arg)) < 0))
1883: fatal_f("bad port number in %s", what);
1884: /* Send it to channels layer */
1885: channel_add_permission(ssh, FORWARD_ADM,
1886: where, addr, port);
1887: free(oarg);
1888: }
1889: }
1890:
1891: static void
1.466 djm 1892: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1893: {
1.86 markus 1894: int success = 0;
1.70 markus 1895: int i;
1.551 markus 1896:
1897: ssh_init_forward_permissions(ssh, "permitremoteopen",
1898: options.permitted_remote_opens,
1899: options.num_permitted_remote_opens);
1.331 dtucker 1900:
1.524 djm 1901: if (options.exit_on_forward_failure)
1902: forward_confirms_pending = 0; /* track pending requests */
1.70 markus 1903: /* Initiate local TCP/IP port forwardings. */
1904: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1905: debug("Local connections to %.200s:%d forwarded to remote "
1906: "address %.200s:%d",
1.406 millert 1907: (options.local_forwards[i].listen_path != NULL) ?
1908: options.local_forwards[i].listen_path :
1.234 deraadt 1909: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1910: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1911: options.local_forwards[i].listen_host,
1912: options.local_forwards[i].listen_port,
1.406 millert 1913: (options.local_forwards[i].connect_path != NULL) ?
1914: options.local_forwards[i].connect_path :
1.232 djm 1915: options.local_forwards[i].connect_host,
1916: options.local_forwards[i].connect_port);
1.463 djm 1917: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1918: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1919: }
1.283 markus 1920: if (i > 0 && success != i && options.exit_on_forward_failure)
1921: fatal("Could not request local forwarding.");
1.86 markus 1922: if (i > 0 && success == 0)
1923: error("Could not request local forwarding.");
1.70 markus 1924:
1925: /* Initiate remote TCP/IP port forwardings. */
1926: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1927: debug("Remote connections from %.200s:%d forwarded to "
1928: "local address %.200s:%d",
1.406 millert 1929: (options.remote_forwards[i].listen_path != NULL) ?
1930: options.remote_forwards[i].listen_path :
1.248 djm 1931: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1932: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1933: options.remote_forwards[i].listen_port,
1.406 millert 1934: (options.remote_forwards[i].connect_path != NULL) ?
1935: options.remote_forwards[i].connect_path :
1.232 djm 1936: options.remote_forwards[i].connect_host,
1937: options.remote_forwards[i].connect_port);
1.523 djm 1938: if ((options.remote_forwards[i].handle =
1.463 djm 1939: channel_request_remote_forwarding(ssh,
1.523 djm 1940: &options.remote_forwards[i])) >= 0) {
1.463 djm 1941: client_register_global_confirm(
1942: ssh_confirm_remote_forward,
1.366 markus 1943: &options.remote_forwards[i]);
1.523 djm 1944: forward_confirms_pending++;
1945: } else if (options.exit_on_forward_failure)
1946: fatal("Could not request remote forwarding.");
1947: else
1948: logit("Warning: Could not request remote forwarding.");
1.70 markus 1949: }
1.301 djm 1950:
1951: /* Initiate tunnel forwarding. */
1952: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1953: if ((*ifname = client_request_tun_fwd(ssh,
1954: options.tun_open, options.tun_local,
1.523 djm 1955: options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
1956: forward_confirms_pending++;
1957: else if (options.exit_on_forward_failure)
1958: fatal("Could not request tunnel forwarding.");
1959: else
1960: error("Could not request tunnel forwarding.");
1.524 djm 1961: }
1962: if (forward_confirms_pending > 0) {
1.540 djm 1963: debug_f("expecting replies for %d forwards",
1.524 djm 1964: forward_confirms_pending);
1.468 djm 1965: }
1.70 markus 1966: }
1967:
1.126 itojun 1968: static void
1.70 markus 1969: check_agent_present(void)
1970: {
1.412 djm 1971: int r;
1972:
1.70 markus 1973: if (options.forward_agent) {
1.254 djm 1974: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1975: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1976: options.forward_agent = 0;
1.412 djm 1977: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.540 djm 1978: debug_r(r, "ssh_get_authentication_socket");
1.412 djm 1979: }
1.70 markus 1980: }
1981: }
1982:
1.214 djm 1983: static void
1.463 djm 1984: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 1985: {
1.215 djm 1986: extern char **environ;
1.558 djm 1987: const char *display, *term;
1.499 djm 1988: int r, interactive = tty_flag;
1.433 djm 1989: char *proto = NULL, *data = NULL;
1.337 djm 1990:
1991: if (!success)
1992: return; /* No need for error message, channels code sens one */
1.215 djm 1993:
1.248 djm 1994: display = getenv("DISPLAY");
1.417 djm 1995: if (display == NULL && options.forward_x11)
1996: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 1997: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 1998: options.xauth_location, options.forward_x11_trusted,
1999: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 2000: /* Request forwarding with authentication spoofing. */
1.316 djm 2001: debug("Requesting X11 forwarding with authentication "
2002: "spoofing.");
1.463 djm 2003: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 2004: data, 1);
1.463 djm 2005: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 2006: /* XXX exit_on_forward_failure */
1.80 markus 2007: interactive = 1;
1.50 markus 2008: }
2009:
1.70 markus 2010: check_agent_present();
2011: if (options.forward_agent) {
2012: debug("Requesting authentication agent forwarding.");
1.463 djm 2013: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 2014: if ((r = sshpkt_send(ssh)) != 0)
1.540 djm 2015: fatal_fr(r, "send packet");
1.212 djm 2016: }
1.369 dtucker 2017:
2018: /* Tell the packet module whether this is an interactive session. */
1.499 djm 2019: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 2020: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 2021:
1.558 djm 2022: if ((term = lookup_env_in_list("TERM", options.setenv,
2023: options.num_setenv)) == NULL || *term == '\0')
2024: term = getenv("TERM");
1.562 djm 2025: client_session2_setup(ssh, id, tty_flag,
2026: options.session_type == SESSION_TYPE_SUBSYSTEM, term,
1.482 markus 2027: NULL, fileno(stdin), command, environ);
1.45 markus 2028: }
2029:
1.143 markus 2030: /* open new channel for a session */
1.126 itojun 2031: static int
1.463 djm 2032: ssh_session2_open(struct ssh *ssh)
1.45 markus 2033: {
1.118 markus 2034: Channel *c;
2035: int window, packetmax, in, out, err;
1.60 markus 2036:
1.563 djm 2037: if (options.stdin_null) {
1.93 itojun 2038: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 2039: } else {
2040: in = dup(STDIN_FILENO);
2041: }
1.60 markus 2042: out = dup(STDOUT_FILENO);
2043: err = dup(STDERR_FILENO);
1.45 markus 2044:
1.505 deraadt 2045: if (in == -1 || out == -1 || err == -1)
1.62 markus 2046: fatal("dup() in/out/err failed");
1.45 markus 2047:
1.65 markus 2048: window = CHAN_SES_WINDOW_DEFAULT;
2049: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 2050: if (tty_flag) {
2051: window >>= 1;
2052: packetmax >>= 1;
1.45 markus 2053: }
1.463 djm 2054: c = channel_new(ssh,
1.45 markus 2055: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 2056: window, packetmax, CHAN_EXTENDED_WRITE,
1.557 djm 2057: "client-session", CHANNEL_NONBLOCK_STDIO);
1.45 markus 2058:
1.540 djm 2059: debug3_f("channel_new: %d", c->self);
1.106 markus 2060:
1.463 djm 2061: channel_send_open(ssh, c->self);
1.560 djm 2062: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2063: channel_register_open_confirm(ssh, c->self,
1.310 djm 2064: ssh_session2_setup, NULL);
1.106 markus 2065:
1.118 markus 2066: return c->self;
1.106 markus 2067: }
2068:
1.126 itojun 2069: static int
1.544 djm 2070: ssh_session2(struct ssh *ssh, const struct ssh_conn_info *cinfo)
1.106 markus 2071: {
1.537 djm 2072: int r, id = -1;
1.466 djm 2073: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 2074:
2075: /* XXX should be pre-session */
1.368 djm 2076: if (!options.control_persist)
1.463 djm 2077: ssh_init_stdio_forwarding(ssh);
1.466 djm 2078:
2079: ssh_init_forwarding(ssh, &tun_fwd_ifname);
2080:
2081: if (options.local_command != NULL) {
2082: debug3("expanding LocalCommand: %s", options.local_command);
2083: cp = options.local_command;
2084: options.local_command = percent_expand(cp,
1.546 djm 2085: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.466 djm 2086: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2087: (char *)NULL);
2088: debug3("expanded LocalCommand: %s", options.local_command);
2089: free(cp);
2090: }
1.106 markus 2091:
1.344 djm 2092: /* Start listening for multiplex clients */
1.499 djm 2093: if (!ssh_packet_get_mux(ssh))
1.463 djm 2094: muxserver_listen(ssh);
1.344 djm 2095:
1.473 djm 2096: /*
1.368 djm 2097: * If we are in control persist mode and have a working mux listen
2098: * socket, then prepare to background ourselves and have a foreground
1.531 djm 2099: * client attach as a control client.
1.368 djm 2100: * NB. we must save copies of the flags that we override for
1.531 djm 2101: * the backgrounding, since we defer attachment of the client until
1.344 djm 2102: * after the connection is fully established (in particular,
2103: * async rfwd replies have been received for ExitOnForwardFailure).
2104: */
1.473 djm 2105: if (options.control_persist && muxserver_sock != -1) {
1.563 djm 2106: ostdin_null_flag = options.stdin_null;
1.560 djm 2107: osession_type = options.session_type;
1.359 djm 2108: orequest_tty = options.request_tty;
1.344 djm 2109: otty_flag = tty_flag;
1.563 djm 2110: options.stdin_null = 1;
1.560 djm 2111: options.session_type = SESSION_TYPE_NONE;
1.473 djm 2112: tty_flag = 0;
1.564 djm 2113: if (!options.fork_after_authentication &&
1.562 djm 2114: (osession_type != SESSION_TYPE_NONE ||
2115: options.stdio_forward_host != NULL))
1.344 djm 2116: need_controlpersist_detach = 1;
1.564 djm 2117: options.fork_after_authentication = 1;
1.473 djm 2118: }
1.368 djm 2119: /*
2120: * ControlPersist mux listen socket setup failed, attempt the
2121: * stdio forward setup that we skipped earlier.
2122: */
2123: if (options.control_persist && muxserver_sock == -1)
1.463 djm 2124: ssh_init_stdio_forwarding(ssh);
1.344 djm 2125:
1.560 djm 2126: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2127: id = ssh_session2_open(ssh);
1.379 djm 2128: else {
1.499 djm 2129: ssh_packet_set_interactive(ssh,
1.379 djm 2130: options.control_master == SSHCTL_MASTER_NO,
2131: options.ip_qos_interactive, options.ip_qos_bulk);
2132: }
1.314 djm 2133:
2134: /* If we don't expect to open a new session, then disallow it */
1.319 markus 2135: if (options.control_master == SSHCTL_MASTER_NO &&
1.549 djm 2136: (ssh->compat & SSH_NEW_OPENSSH)) {
1.314 djm 2137: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 2138: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2139: (r = sshpkt_put_cstring(ssh,
2140: "no-more-sessions@openssh.com")) != 0 ||
2141: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2142: (r = sshpkt_send(ssh)) != 0)
1.540 djm 2143: fatal_fr(r, "send packet");
1.314 djm 2144: }
1.255 reyk 2145:
2146: /* Execute a local command */
2147: if (options.local_command != NULL &&
2148: options.permit_local_command)
2149: ssh_local_cmd(options.local_command);
1.467 djm 2150:
2151: /*
2152: * stdout is now owned by the session channel; clobber it here
2153: * so future channel closes are propagated to the local fd.
2154: * NB. this can only happen after LocalCommand has completed,
2155: * as it may want to write to stdout.
2156: */
1.537 djm 2157: if (!need_controlpersist_detach && stdfd_devnull(0, 1, 0) == -1)
1.540 djm 2158: error_f("stdfd_devnull failed");
1.301 djm 2159:
1.342 djm 2160: /*
2161: * If requested and we are not interested in replies to remote
2162: * forwarding requests, then let ssh continue in the background.
2163: */
1.564 djm 2164: if (options.fork_after_authentication) {
1.344 djm 2165: if (options.exit_on_forward_failure &&
2166: options.num_remote_forwards > 0) {
2167: debug("deferring postauth fork until remote forward "
2168: "confirmation received");
2169: } else
2170: fork_postauth();
1.318 djm 2171: }
1.31 markus 2172:
1.463 djm 2173: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2174: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2175: }
2176:
1.426 djm 2177: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2178: static void
1.544 djm 2179: load_public_identity_files(const struct ssh_conn_info *cinfo)
1.104 markus 2180: {
1.466 djm 2181: char *filename, *cp;
1.460 markus 2182: struct sshkey *public;
1.426 djm 2183: int i;
2184: u_int n_ids, n_certs;
1.335 djm 2185: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2186: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2187: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2188: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2189: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2190: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2191: #ifdef ENABLE_PKCS11
1.514 djm 2192: struct sshkey **keys = NULL;
2193: char **comments = NULL;
1.333 markus 2194: int nkeys;
1.335 djm 2195: #endif /* PKCS11 */
1.104 markus 2196:
1.426 djm 2197: n_ids = n_certs = 0;
1.398 tedu 2198: memset(identity_files, 0, sizeof(identity_files));
2199: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2200: memset(identity_file_userprovided, 0,
2201: sizeof(identity_file_userprovided));
1.426 djm 2202: memset(certificate_files, 0, sizeof(certificate_files));
2203: memset(certificates, 0, sizeof(certificates));
1.484 djm 2204: memset(certificate_file_userprovided, 0,
2205: sizeof(certificate_file_userprovided));
1.335 djm 2206:
2207: #ifdef ENABLE_PKCS11
1.333 markus 2208: if (options.pkcs11_provider != NULL &&
1.167 markus 2209: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2210: (pkcs11_init(!options.batch_mode) == 0) &&
2211: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1.514 djm 2212: &keys, &comments)) > 0) {
1.333 markus 2213: for (i = 0; i < nkeys; i++) {
1.335 djm 2214: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2215: sshkey_free(keys[i]);
1.514 djm 2216: free(comments[i]);
1.335 djm 2217: continue;
2218: }
2219: identity_keys[n_ids] = keys[i];
1.514 djm 2220: identity_files[n_ids] = comments[i]; /* transferred */
1.335 djm 2221: n_ids++;
1.167 markus 2222: }
1.378 djm 2223: free(keys);
1.514 djm 2224: free(comments);
1.127 markus 2225: }
1.333 markus 2226: #endif /* ENABLE_PKCS11 */
1.335 djm 2227: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2228: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2229: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2230: free(options.identity_files[i]);
1.426 djm 2231: options.identity_files[i] = NULL;
1.335 djm 2232: continue;
2233: }
1.490 dtucker 2234: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.544 djm 2235: filename = default_client_percent_dollar_expand(cp, cinfo);
1.378 djm 2236: free(cp);
1.483 markus 2237: check_load(sshkey_load_public(filename, &public, NULL),
2238: filename, "pubkey");
1.131 millert 2239: debug("identity file %s type %d", filename,
2240: public ? public->type : -1);
1.378 djm 2241: free(options.identity_files[i]);
1.335 djm 2242: identity_files[n_ids] = filename;
2243: identity_keys[n_ids] = public;
1.484 djm 2244: identity_file_userprovided[n_ids] =
2245: options.identity_file_userprovided[i];
1.335 djm 2246: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2247: continue;
2248:
1.426 djm 2249: /*
2250: * If no certificates have been explicitly listed then try
2251: * to add the default certificate variant too.
2252: */
2253: if (options.num_certificate_files != 0)
2254: continue;
1.335 djm 2255: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2256: check_load(sshkey_load_public(cp, &public, NULL),
2257: filename, "pubkey");
1.335 djm 2258: debug("identity file %s type %d", cp,
2259: public ? public->type : -1);
2260: if (public == NULL) {
1.378 djm 2261: free(cp);
1.335 djm 2262: continue;
2263: }
1.483 markus 2264: if (!sshkey_is_cert(public)) {
1.540 djm 2265: debug_f("key %s type %s is not a certificate",
2266: cp, sshkey_type(public));
1.483 markus 2267: sshkey_free(public);
1.378 djm 2268: free(cp);
1.335 djm 2269: continue;
2270: }
1.448 djm 2271: /* NB. leave filename pointing to private key */
2272: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2273: identity_keys[n_ids] = public;
1.484 djm 2274: identity_file_userprovided[n_ids] =
2275: options.identity_file_userprovided[i];
1.335 djm 2276: n_ids++;
2277: }
1.426 djm 2278:
2279: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
1.540 djm 2280: fatal_f("too many certificates");
1.426 djm 2281: for (i = 0; i < options.num_certificate_files; i++) {
2282: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2283: getuid());
1.544 djm 2284: filename = default_client_percent_dollar_expand(cp, cinfo);
1.426 djm 2285: free(cp);
2286:
1.483 markus 2287: check_load(sshkey_load_public(filename, &public, NULL),
2288: filename, "certificate");
1.426 djm 2289: debug("certificate file %s type %d", filename,
2290: public ? public->type : -1);
2291: free(options.certificate_files[i]);
2292: options.certificate_files[i] = NULL;
2293: if (public == NULL) {
2294: free(filename);
2295: continue;
2296: }
1.483 markus 2297: if (!sshkey_is_cert(public)) {
1.540 djm 2298: debug_f("key %s type %s is not a certificate",
2299: filename, sshkey_type(public));
1.483 markus 2300: sshkey_free(public);
1.426 djm 2301: free(filename);
2302: continue;
2303: }
2304: certificate_files[n_certs] = filename;
2305: certificates[n_certs] = public;
1.484 djm 2306: certificate_file_userprovided[n_certs] =
2307: options.certificate_file_userprovided[i];
1.426 djm 2308: ++n_certs;
2309: }
2310:
1.335 djm 2311: options.num_identity_files = n_ids;
2312: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2313: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2314: memcpy(options.identity_file_userprovided,
2315: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2316:
2317: options.num_certificate_files = n_certs;
2318: memcpy(options.certificate_files,
2319: certificate_files, sizeof(certificate_files));
2320: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2321: memcpy(options.certificate_file_userprovided,
2322: certificate_file_userprovided,
2323: sizeof(certificate_file_userprovided));
1.214 djm 2324: }
1.352 djm 2325:
2326: static void
2327: main_sigchld_handler(int sig)
2328: {
2329: int save_errno = errno;
2330: pid_t pid;
2331: int status;
2332:
2333: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2334: (pid == -1 && errno == EINTR))
1.352 djm 2335: ;
2336: errno = save_errno;
2337: }
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