Annotation of src/usr.bin/ssh/ssh.c, Revision 1.563
1.563 ! djm 1: /* $OpenBSD: ssh.c,v 1.562 2021/07/17 00:38:11 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: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 124: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 125: * background.
126: */
1.1 deraadt 127: int fork_after_authentication_flag = 0;
128:
1.33 markus 129: /*
130: * General data structure for command line options and options configurable
131: * in configuration files. See readconf.h.
132: */
1.1 deraadt 133: Options options;
134:
1.139 markus 135: /* optional user configfile */
136: char *config = NULL;
137:
1.33 markus 138: /*
139: * Name of the host we are connecting to. This is the name given on the
1.503 jmc 140: * command line, or the Hostname specified for the user-supplied name in a
1.33 markus 141: * configuration file.
142: */
1.1 deraadt 143: char *host;
144:
1.510 djm 145: /*
146: * A config can specify a path to forward, overriding SSH_AUTH_SOCK. If this is
147: * not NULL, forward the socket at this path instead.
148: */
149: char *forward_agent_sock_path = NULL;
150:
1.22 provos 151: /* socket address the host resolves to */
1.37 markus 152: struct sockaddr_storage hostaddr;
1.1 deraadt 153:
1.112 markus 154: /* Private host keys. */
1.173 markus 155: Sensitive sensitive_data;
1.1 deraadt 156:
1.45 markus 157: /* command to be executed */
1.482 markus 158: struct sshbuf *command;
1.45 markus 159:
1.170 markus 160: /* # of replies received for global requests */
1.523 djm 161: static int forward_confirms_pending = -1;
1.170 markus 162:
1.313 djm 163: /* mux.c */
164: extern int muxserver_sock;
165: extern u_int muxclient_command;
166:
1.1 deraadt 167: /* Prints a help message to the user. This function never returns. */
168:
1.126 itojun 169: static void
1.93 itojun 170: usage(void)
1.1 deraadt 171: {
1.208 markus 172: fprintf(stderr,
1.474 djm 173: "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n"
174: " [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n"
175: " [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n"
176: " [-i identity_file] [-J [user@]host[:port]] [-L address]\n"
177: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
178: " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
179: " [-w local_tun[:remote_tun]] destination [command]\n"
1.208 markus 180: );
1.257 dtucker 181: exit(255);
1.1 deraadt 182: }
183:
1.544 djm 184: static int ssh_session2(struct ssh *, const struct ssh_conn_info *);
185: static void load_public_identity_files(const struct ssh_conn_info *);
1.352 djm 186: static void main_sigchld_handler(int);
1.312 djm 187:
1.361 djm 188: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
189: static void
190: tilde_expand_paths(char **paths, u_int num_paths)
191: {
192: u_int i;
193: char *cp;
194:
195: for (i = 0; i < num_paths; i++) {
1.490 dtucker 196: cp = tilde_expand_filename(paths[i], getuid());
1.378 djm 197: free(paths[i]);
1.361 djm 198: paths[i] = cp;
199: }
200: }
201:
1.527 dtucker 202: /*
203: * Expands the set of percent_expand options used by the majority of keywords
204: * in the client that support percent expansion.
205: * Caller must free returned string.
206: */
207: static char *
1.544 djm 208: default_client_percent_expand(const char *str,
209: const struct ssh_conn_info *cinfo)
1.527 dtucker 210: {
211: return percent_expand(str,
1.546 djm 212: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.527 dtucker 213: (char *)NULL);
214: }
215:
1.400 djm 216: /*
1.528 dtucker 217: * Expands the set of percent_expand options used by the majority of keywords
218: * AND perform environment variable substitution.
219: * Caller must free returned string.
220: */
221: static char *
1.544 djm 222: default_client_percent_dollar_expand(const char *str,
223: const struct ssh_conn_info *cinfo)
1.528 dtucker 224: {
225: char *ret;
226:
227: ret = percent_dollar_expand(str,
1.546 djm 228: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.528 dtucker 229: (char *)NULL);
230: if (ret == NULL)
231: fatal("invalid environment variable expansion");
232: return ret;
233: }
234:
235: /*
1.400 djm 236: * Attempt to resolve a host name / port to a set of addresses and
237: * optionally return any CNAMEs encountered along the way.
238: * Returns NULL on failure.
239: * NB. this function must operate with a options having undefined members.
240: */
1.385 djm 241: static struct addrinfo *
1.400 djm 242: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 243: {
244: char strport[NI_MAXSERV];
245: struct addrinfo hints, *res;
1.501 dtucker 246: int gaierr;
247: LogLevel loglevel = SYSLOG_LEVEL_DEBUG1;
1.385 djm 248:
1.400 djm 249: if (port <= 0)
250: port = default_ssh_port();
1.521 markus 251: if (cname != NULL)
252: *cname = '\0';
1.400 djm 253:
1.427 djm 254: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 255: memset(&hints, 0, sizeof(hints));
1.400 djm 256: hints.ai_family = options.address_family == -1 ?
257: AF_UNSPEC : options.address_family;
1.385 djm 258: hints.ai_socktype = SOCK_STREAM;
259: if (cname != NULL)
260: hints.ai_flags = AI_CANONNAME;
261: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
262: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
263: loglevel = SYSLOG_LEVEL_ERROR;
264: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
265: __progname, name, ssh_gai_strerror(gaierr));
266: return NULL;
267: }
268: if (cname != NULL && res->ai_canonname != NULL) {
269: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
1.540 djm 270: error_f("host \"%s\" cname \"%s\" too long (max %lu)",
271: name, res->ai_canonname, (u_long)clen);
1.385 djm 272: if (clen > 0)
273: *cname = '\0';
274: }
275: }
276: return res;
277: }
278:
1.470 djm 279: /* Returns non-zero if name can only be an address and not a hostname */
280: static int
281: is_addr_fast(const char *name)
282: {
283: return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
284: strspn(name, "0123456789.") == strlen(name));
285: }
286:
287: /* Returns non-zero if name represents a valid, single address */
288: static int
289: is_addr(const char *name)
290: {
291: char strport[NI_MAXSERV];
292: struct addrinfo hints, *res;
293:
294: if (is_addr_fast(name))
295: return 1;
296:
297: snprintf(strport, sizeof strport, "%u", default_ssh_port());
298: memset(&hints, 0, sizeof(hints));
299: hints.ai_family = options.address_family == -1 ?
300: AF_UNSPEC : options.address_family;
301: hints.ai_socktype = SOCK_STREAM;
302: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
303: if (getaddrinfo(name, strport, &hints, &res) != 0)
304: return 0;
305: if (res == NULL || res->ai_next != NULL) {
306: freeaddrinfo(res);
307: return 0;
308: }
309: freeaddrinfo(res);
310: return 1;
311: }
312:
1.385 djm 313: /*
1.413 djm 314: * Attempt to resolve a numeric host address / port to a single address.
315: * Returns a canonical address string.
316: * Returns NULL on failure.
317: * NB. this function must operate with a options having undefined members.
318: */
319: static struct addrinfo *
320: resolve_addr(const char *name, int port, char *caddr, size_t clen)
321: {
322: char addr[NI_MAXHOST], strport[NI_MAXSERV];
323: struct addrinfo hints, *res;
324: int gaierr;
325:
326: if (port <= 0)
327: port = default_ssh_port();
328: snprintf(strport, sizeof strport, "%u", port);
329: memset(&hints, 0, sizeof(hints));
330: hints.ai_family = options.address_family == -1 ?
331: AF_UNSPEC : options.address_family;
332: hints.ai_socktype = SOCK_STREAM;
333: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
334: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
1.540 djm 335: debug2_f("could not resolve name %.100s as address: %s",
336: name, ssh_gai_strerror(gaierr));
1.413 djm 337: return NULL;
338: }
339: if (res == NULL) {
1.540 djm 340: debug_f("getaddrinfo %.100s returned no addresses", name);
1.413 djm 341: return NULL;
342: }
343: if (res->ai_next != NULL) {
1.540 djm 344: debug_f("getaddrinfo %.100s returned multiple addresses", name);
1.413 djm 345: goto fail;
346: }
347: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
348: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
1.540 djm 349: debug_f("Could not format address for name %.100s: %s",
350: name, ssh_gai_strerror(gaierr));
1.413 djm 351: goto fail;
352: }
353: if (strlcpy(caddr, addr, clen) >= clen) {
1.540 djm 354: error_f("host \"%s\" addr \"%s\" too long (max %lu)",
355: name, addr, (u_long)clen);
1.413 djm 356: if (clen > 0)
357: *caddr = '\0';
358: fail:
359: freeaddrinfo(res);
360: return NULL;
361: }
362: return res;
363: }
364:
365: /*
1.385 djm 366: * Check whether the cname is a permitted replacement for the hostname
367: * and perform the replacement if it is.
1.400 djm 368: * NB. this function must operate with a options having undefined members.
1.385 djm 369: */
370: static int
1.443 djm 371: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 372: {
373: int i;
374: struct allowed_cname *rule;
375:
376: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
377: strcmp(*namep, cname) == 0)
378: return 0;
1.386 djm 379: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 380: return 0;
381: /*
1.386 djm 382: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 383: * a proxy or jump host unless the user specifically requests so.
1.385 djm 384: */
1.443 djm 385: if (!direct &&
1.386 djm 386: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 387: return 0;
1.540 djm 388: debug3_f("check \"%s\" CNAME \"%s\"", *namep, cname);
1.385 djm 389: for (i = 0; i < options.num_permitted_cnames; i++) {
390: rule = options.permitted_cnames + i;
1.418 djm 391: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
392: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 393: continue;
1.386 djm 394: verbose("Canonicalized DNS aliased hostname "
1.385 djm 395: "\"%s\" => \"%s\"", *namep, cname);
396: free(*namep);
397: *namep = xstrdup(cname);
398: return 1;
399: }
400: return 0;
401: }
402:
403: /*
404: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 405: * canonicalization rules. Returns the address list for the host or NULL
406: * if no name was found after canonicalization.
1.400 djm 407: * NB. this function must operate with a options having undefined members.
1.385 djm 408: */
409: static struct addrinfo *
1.400 djm 410: resolve_canonicalize(char **hostp, int port)
1.385 djm 411: {
1.443 djm 412: int i, direct, ndots;
1.413 djm 413: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 414: struct addrinfo *addrs;
415:
416: /*
1.470 djm 417: * Attempt to canonicalise addresses, regardless of
418: * whether hostname canonicalisation was requested
1.385 djm 419: */
1.413 djm 420: if ((addrs = resolve_addr(*hostp, port,
421: newname, sizeof(newname))) != NULL) {
1.540 djm 422: debug2_f("hostname %.100s is address", *hostp);
1.413 djm 423: if (strcasecmp(*hostp, newname) != 0) {
1.540 djm 424: debug2_f("canonicalised address \"%s\" => \"%s\"",
425: *hostp, newname);
1.413 djm 426: free(*hostp);
427: *hostp = xstrdup(newname);
428: }
429: return addrs;
430: }
431:
1.470 djm 432: /*
433: * If this looks like an address but didn't parse as one, it might
434: * be an address with an invalid interface scope. Skip further
435: * attempts at canonicalisation.
436: */
437: if (is_addr_fast(*hostp)) {
1.540 djm 438: debug_f("hostname %.100s is an unrecognised address", *hostp);
1.470 djm 439: return NULL;
440: }
441:
442: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
443: return NULL;
444:
445: /*
446: * Don't attempt to canonicalize names that will be interpreted by
447: * a proxy unless the user specifically requests so.
448: */
449: direct = option_clear_or_none(options.proxy_command) &&
450: options.jump_host == NULL;
451: if (!direct &&
452: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
453: return NULL;
454:
1.428 djm 455: /* If domain name is anchored, then resolve it now */
456: if ((*hostp)[strlen(*hostp) - 1] == '.') {
1.540 djm 457: debug3_f("name is fully qualified");
1.428 djm 458: fullhost = xstrdup(*hostp);
459: if ((addrs = resolve_host(fullhost, port, 0,
460: newname, sizeof(newname))) != NULL)
461: goto found;
462: free(fullhost);
463: goto notfound;
464: }
465:
1.387 djm 466: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 467: ndots = 0;
468: for (cp = *hostp; *cp != '\0'; cp++) {
469: if (*cp == '.')
470: ndots++;
471: }
1.386 djm 472: if (ndots > options.canonicalize_max_dots) {
1.540 djm 473: debug3_f("not canonicalizing hostname \"%s\" (max dots %d)",
474: *hostp, options.canonicalize_max_dots);
1.385 djm 475: return NULL;
476: }
477: /* Attempt each supplied suffix */
478: for (i = 0; i < options.num_canonical_domains; i++) {
1.559 djm 479: if (strcasecmp(options.canonical_domains[i], "none") == 0)
480: break;
1.385 djm 481: xasprintf(&fullhost, "%s.%s.", *hostp,
482: options.canonical_domains[i]);
1.540 djm 483: debug3_f("attempting \"%s\" => \"%s\"", *hostp, fullhost);
1.400 djm 484: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 485: newname, sizeof(newname))) == NULL) {
1.385 djm 486: free(fullhost);
487: continue;
488: }
1.428 djm 489: found:
1.385 djm 490: /* Remove trailing '.' */
491: fullhost[strlen(fullhost) - 1] = '\0';
492: /* Follow CNAME if requested */
1.443 djm 493: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 494: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 495: *hostp, fullhost);
496: }
497: free(*hostp);
498: *hostp = fullhost;
499: return addrs;
500: }
1.428 djm 501: notfound:
1.386 djm 502: if (!options.canonicalize_fallback_local)
1.400 djm 503: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
1.540 djm 504: debug2_f("host %s not found in any suffix", *hostp);
1.385 djm 505: return NULL;
506: }
507:
1.32 deraadt 508: /*
1.483 markus 509: * Check the result of hostkey loading, ignoring some errors and
510: * fatal()ing for others.
511: */
512: static void
513: check_load(int r, const char *path, const char *message)
514: {
515: switch (r) {
516: case 0:
517: break;
518: case SSH_ERR_INTERNAL_ERROR:
519: case SSH_ERR_ALLOC_FAIL:
1.540 djm 520: fatal_r(r, "load %s \"%s\"", message, path);
1.483 markus 521: case SSH_ERR_SYSTEM_ERROR:
522: /* Ignore missing files */
523: if (errno == ENOENT)
524: break;
525: /* FALLTHROUGH */
526: default:
1.540 djm 527: error_r(r, "load %s \"%s\"", message, path);
1.483 markus 528: break;
529: }
530: }
531:
532: /*
1.400 djm 533: * Read per-user configuration file. Ignore the system wide config
534: * file if the user specifies a config file on the command line.
535: */
536: static void
1.496 djm 537: process_config_files(const char *host_name, struct passwd *pw, int final_pass,
538: int *want_final_pass)
1.400 djm 539: {
1.414 deraadt 540: char buf[PATH_MAX];
1.400 djm 541: int r;
542:
543: if (config != NULL) {
544: if (strcasecmp(config, "none") != 0 &&
1.466 djm 545: !read_config_file(config, pw, host, host_name, &options,
1.496 djm 546: SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0),
547: want_final_pass))
1.400 djm 548: fatal("Can't open user config file %.100s: "
549: "%.100s", config, strerror(errno));
550: } else {
551: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
552: _PATH_SSH_USER_CONFFILE);
553: if (r > 0 && (size_t)r < sizeof(buf))
1.466 djm 554: (void)read_config_file(buf, pw, host, host_name,
1.408 djm 555: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
1.496 djm 556: (final_pass ? SSHCONF_FINAL : 0), want_final_pass);
1.400 djm 557:
558: /* Read systemwide configuration file after user config. */
1.408 djm 559: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
1.466 djm 560: host, host_name, &options,
1.496 djm 561: final_pass ? SSHCONF_FINAL : 0, want_final_pass);
1.408 djm 562: }
563: }
564:
565: /* Rewrite the port number in an addrinfo list of addresses */
566: static void
567: set_addrinfo_port(struct addrinfo *addrs, int port)
568: {
569: struct addrinfo *addr;
570:
571: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
572: switch (addr->ai_family) {
573: case AF_INET:
574: ((struct sockaddr_in *)addr->ai_addr)->
575: sin_port = htons(port);
576: break;
577: case AF_INET6:
578: ((struct sockaddr_in6 *)addr->ai_addr)->
579: sin6_port = htons(port);
580: break;
581: }
1.400 djm 582: }
583: }
584:
1.544 djm 585: static void
586: ssh_conn_info_free(struct ssh_conn_info *cinfo)
587: {
588: if (cinfo == NULL)
589: return;
590: free(cinfo->conn_hash_hex);
591: free(cinfo->shorthost);
592: free(cinfo->uidstr);
593: free(cinfo->keyalias);
594: free(cinfo->thishost);
595: free(cinfo->host_arg);
596: free(cinfo->portstr);
597: free(cinfo->remhost);
598: free(cinfo->remuser);
599: free(cinfo->homedir);
600: free(cinfo->locuser);
601: free(cinfo);
602: }
603:
1.400 djm 604: /*
1.32 deraadt 605: * Main program for the ssh client.
606: */
1.2 provos 607: int
608: main(int ac, char **av)
1.1 deraadt 609: {
1.437 djm 610: struct ssh *ssh = NULL;
1.462 djm 611: int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
1.496 djm 612: int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
1.544 djm 613: char *p, *cp, *line, *argv0, *logfile, *host_arg;
614: char cname[NI_MAXHOST], thishost[NI_MAXHOST];
1.31 markus 615: struct stat st;
1.98 markus 616: struct passwd *pw;
1.144 stevesk 617: extern int optind, optreset;
618: extern char *optarg;
1.406 millert 619: struct Forward fwd;
1.385 djm 620: struct addrinfo *addrs = NULL;
1.513 dtucker 621: size_t n, len;
1.532 dtucker 622: u_int j;
1.544 djm 623: struct ssh_conn_info *cinfo = NULL;
1.250 djm 624:
625: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
626: sanitise_stdfd();
1.31 markus 627:
1.33 markus 628: /*
1.346 djm 629: * Discard other fds that are hanging around. These can cause problem
630: * with backgrounded ssh processes started by ControlPersist.
631: */
632: closefrom(STDERR_FILENO + 1);
633:
1.487 dtucker 634: if (getuid() != geteuid())
635: fatal("ssh setuid not supported.");
636: if (getgid() != getegid())
637: fatal("ssh setgid not supported.");
1.184 stevesk 638:
1.107 markus 639: /* Get user data. */
1.490 dtucker 640: pw = getpwuid(getuid());
1.107 markus 641: if (!pw) {
1.490 dtucker 642: logit("No user exists for uid %lu", (u_long)getuid());
1.257 dtucker 643: exit(255);
1.107 markus 644: }
645: /* Take a copy of the returned structure. */
646: pw = pwcopy(pw);
1.31 markus 647:
1.33 markus 648: /*
649: * Set our umask to something reasonable, as some files are created
650: * with the default umask. This will make them world-readable but
651: * writable only by the owner, which is ok for all files for which we
652: * don't set the modes explicitly.
653: */
1.31 markus 654: umask(022);
1.445 djm 655:
656: setlocale(LC_CTYPE, "");
1.31 markus 657:
1.316 djm 658: /*
659: * Initialize option structure to indicate that no values have been
660: * set.
661: */
1.31 markus 662: initialize_options(&options);
663:
1.463 djm 664: /*
665: * Prepare main ssh transport/connection structures
666: */
667: if ((ssh = ssh_alloc_session_state()) == NULL)
668: fatal("Couldn't allocate session state");
669: channel_init_channels(ssh);
670:
1.31 markus 671: /* Parse command-line arguments. */
672: host = NULL;
1.320 djm 673: use_syslog = 0;
1.375 dtucker 674: logfile = NULL;
1.325 markus 675: argv0 = av[0];
1.31 markus 676:
1.266 djm 677: again:
1.316 djm 678: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.474 djm 679: "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 680: switch (opt) {
1.91 jakob 681: case '1':
1.454 djm 682: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 683: break;
1.47 markus 684: case '2':
1.454 djm 685: /* Ignored */
1.47 markus 686: break;
1.37 markus 687: case '4':
1.196 djm 688: options.address_family = AF_INET;
1.37 markus 689: break;
690: case '6':
1.196 djm 691: options.address_family = AF_INET6;
1.37 markus 692: break;
1.31 markus 693: case 'n':
1.563 ! djm 694: options.stdin_null = 1;
1.31 markus 695: break;
696: case 'f':
697: fork_after_authentication_flag = 1;
1.563 ! djm 698: options.stdin_null = 1;
1.31 markus 699: break;
700: case 'x':
701: options.forward_x11 = 0;
702: break;
703: case 'X':
704: options.forward_x11 = 1;
705: break;
1.320 djm 706: case 'y':
707: use_syslog = 1;
708: break;
1.375 dtucker 709: case 'E':
1.422 dtucker 710: logfile = optarg;
1.375 dtucker 711: break;
1.408 djm 712: case 'G':
713: config_test = 1;
714: break;
1.202 markus 715: case 'Y':
716: options.forward_x11 = 1;
717: options.forward_x11_trusted = 1;
718: break;
1.31 markus 719: case 'g':
1.406 millert 720: options.fwd_opts.gateway_ports = 1;
1.31 markus 721: break;
1.229 djm 722: case 'O':
1.441 dtucker 723: if (options.stdio_forward_host != NULL)
1.332 djm 724: fatal("Cannot specify multiplexing "
725: "command with -W");
726: else if (muxclient_command != 0)
727: fatal("Multiplexing command already specified");
1.229 djm 728: if (strcmp(optarg, "check") == 0)
1.312 djm 729: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 730: else if (strcmp(optarg, "forward") == 0)
731: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 732: else if (strcmp(optarg, "exit") == 0)
1.312 djm 733: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 734: else if (strcmp(optarg, "stop") == 0)
735: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 736: else if (strcmp(optarg, "cancel") == 0)
737: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 738: else if (strcmp(optarg, "proxy") == 0)
739: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 740: else
741: fatal("Invalid multiplex command.");
742: break;
1.183 stevesk 743: case 'P': /* deprecated */
1.376 djm 744: break;
1.394 deraadt 745: case 'Q':
1.376 djm 746: cp = NULL;
1.519 dtucker 747: if (strcmp(optarg, "cipher") == 0 ||
748: strcasecmp(optarg, "Ciphers") == 0)
1.393 djm 749: cp = cipher_alg_list('\n', 0);
1.394 deraadt 750: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 751: cp = cipher_alg_list('\n', 1);
1.519 dtucker 752: else if (strcmp(optarg, "mac") == 0 ||
753: strcasecmp(optarg, "MACs") == 0)
1.392 dtucker 754: cp = mac_alg_list('\n');
1.519 dtucker 755: else if (strcmp(optarg, "kex") == 0 ||
756: strcasecmp(optarg, "KexAlgorithms") == 0)
1.392 dtucker 757: cp = kex_alg_list('\n');
1.394 deraadt 758: else if (strcmp(optarg, "key") == 0)
1.451 djm 759: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 760: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 761: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 762: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 763: cp = sshkey_alg_list(0, 1, 0, '\n');
1.519 dtucker 764: else if (strcmp(optarg, "key-sig") == 0 ||
1.547 dtucker 765: strcasecmp(optarg, "PubkeyAcceptedKeyTypes") == 0 || /* deprecated name */
766: strcasecmp(optarg, "PubkeyAcceptedAlgorithms") == 0 ||
1.519 dtucker 767: strcasecmp(optarg, "HostKeyAlgorithms") == 0 ||
1.548 dtucker 768: strcasecmp(optarg, "HostbasedKeyTypes") == 0 || /* deprecated name */
769: strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 0 || /* deprecated name */
770: strcasecmp(optarg, "HostbasedAcceptedAlgorithms") == 0)
1.519 dtucker 771: cp = sshkey_alg_list(0, 0, 1, '\n');
1.491 djm 772: else if (strcmp(optarg, "sig") == 0)
1.492 djm 773: cp = sshkey_alg_list(0, 1, 1, '\n');
1.491 djm 774: else if (strcmp(optarg, "protocol-version") == 0)
1.416 djm 775: cp = xstrdup("2");
1.513 dtucker 776: else if (strcmp(optarg, "compression") == 0) {
777: cp = xstrdup(compression_alg_list(0));
778: len = strlen(cp);
779: for (n = 0; n < len; n++)
780: if (cp[n] == ',')
781: cp[n] = '\n';
782: } else if (strcmp(optarg, "help") == 0) {
1.491 djm 783: cp = xstrdup(
1.513 dtucker 784: "cipher\ncipher-auth\ncompression\nkex\n"
1.519 dtucker 785: "key\nkey-cert\nkey-plain\nkey-sig\nmac\n"
1.491 djm 786: "protocol-version\nsig");
1.416 djm 787: }
1.376 djm 788: if (cp == NULL)
789: fatal("Unsupported query \"%s\"", optarg);
790: printf("%s\n", cp);
791: free(cp);
792: exit(0);
1.31 markus 793: break;
794: case 'a':
795: options.forward_agent = 0;
1.53 markus 796: break;
797: case 'A':
798: options.forward_agent = 1;
1.31 markus 799: break;
800: case 'k':
1.204 dtucker 801: options.gss_deleg_creds = 0;
1.297 djm 802: break;
803: case 'K':
804: options.gss_authentication = 1;
805: options.gss_deleg_creds = 1;
1.31 markus 806: break;
807: case 'i':
1.490 dtucker 808: p = tilde_expand_filename(optarg, getuid());
1.505 deraadt 809: if (stat(p, &st) == -1)
1.128 fgsch 810: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 811: "not accessible: %s.\n", p,
1.231 otto 812: strerror(errno));
1.429 dtucker 813: else
814: add_identity_file(&options, NULL, p, 1);
815: free(p);
1.31 markus 816: break;
1.127 markus 817: case 'I':
1.333 markus 818: #ifdef ENABLE_PKCS11
1.422 dtucker 819: free(options.pkcs11_provider);
1.333 markus 820: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 821: #else
1.333 markus 822: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 823: #endif
1.127 markus 824: break;
1.443 djm 825: case 'J':
1.504 djm 826: if (options.jump_host != NULL) {
827: fatal("Only a single -J option is permitted "
828: "(use commas to separate multiple "
829: "jump hops)");
830: }
1.443 djm 831: if (options.proxy_command != NULL)
832: fatal("Cannot specify -J with ProxyCommand");
833: if (parse_jump(optarg, &options, 1) == -1)
834: fatal("Invalid -J argument");
835: options.proxy_command = xstrdup("none");
836: break;
1.31 markus 837: case 't':
1.359 djm 838: if (options.request_tty == REQUEST_TTY_YES)
839: options.request_tty = REQUEST_TTY_FORCE;
840: else
841: options.request_tty = REQUEST_TTY_YES;
1.31 markus 842: break;
843: case 'v':
1.197 markus 844: if (debug_flag == 0) {
1.66 markus 845: debug_flag = 1;
846: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 847: } else {
1.443 djm 848: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
849: debug_flag++;
1.197 markus 850: options.log_level++;
1.443 djm 851: }
1.197 markus 852: }
1.375 dtucker 853: break;
1.31 markus 854: case 'V':
1.209 markus 855: fprintf(stderr, "%s, %s\n",
1.541 dtucker 856: SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 857: if (opt == 'V')
858: exit(0);
859: break;
1.255 reyk 860: case 'w':
1.256 reyk 861: if (options.tun_open == -1)
862: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 863: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 864: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 865: fprintf(stderr,
866: "Bad tun device '%s'\n", optarg);
1.257 dtucker 867: exit(255);
1.255 reyk 868: }
869: break;
1.331 dtucker 870: case 'W':
1.441 dtucker 871: if (options.stdio_forward_host != NULL)
1.332 djm 872: fatal("stdio forward already specified");
873: if (muxclient_command != 0)
874: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 875: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 876: options.stdio_forward_host = fwd.listen_host;
877: options.stdio_forward_port = fwd.listen_port;
1.378 djm 878: free(fwd.connect_host);
1.331 dtucker 879: } else {
880: fprintf(stderr,
881: "Bad stdio forwarding specification '%s'\n",
882: optarg);
883: exit(255);
884: }
1.359 djm 885: options.request_tty = REQUEST_TTY_NO;
1.560 djm 886: options.session_type = SESSION_TYPE_NONE;
1.331 dtucker 887: break;
1.31 markus 888: case 'q':
889: options.log_level = SYSLOG_LEVEL_QUIET;
890: break;
891: case 'e':
892: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 893: (u_char) optarg[1] >= 64 &&
894: (u_char) optarg[1] < 128)
1.78 markus 895: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 896: else if (strlen(optarg) == 1)
1.78 markus 897: options.escape_char = (u_char) optarg[0];
1.31 markus 898: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 899: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 900: else {
1.128 fgsch 901: fprintf(stderr, "Bad escape character '%s'.\n",
902: optarg);
1.257 dtucker 903: exit(255);
1.31 markus 904: }
905: break;
906: case 'c':
1.506 naddy 907: if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
1.420 djm 908: optarg + 1 : optarg)) {
909: fprintf(stderr, "Unknown cipher type '%s'\n",
910: optarg);
911: exit(255);
1.95 markus 912: }
1.456 djm 913: free(options.ciphers);
914: options.ciphers = xstrdup(optarg);
1.95 markus 915: break;
916: case 'm':
1.422 dtucker 917: if (mac_valid(optarg)) {
918: free(options.macs);
1.95 markus 919: options.macs = xstrdup(optarg);
1.422 dtucker 920: } else {
1.128 fgsch 921: fprintf(stderr, "Unknown mac type '%s'\n",
922: optarg);
1.257 dtucker 923: exit(255);
1.31 markus 924: }
925: break;
1.214 djm 926: case 'M':
1.242 djm 927: if (options.control_master == SSHCTL_MASTER_YES)
928: options.control_master = SSHCTL_MASTER_ASK;
929: else
930: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 931: break;
1.31 markus 932: case 'p':
1.465 millert 933: if (options.port == -1) {
934: options.port = a2port(optarg);
935: if (options.port <= 0) {
936: fprintf(stderr, "Bad port '%s'\n",
937: optarg);
938: exit(255);
939: }
1.109 markus 940: }
1.31 markus 941: break;
942: case 'l':
1.465 millert 943: if (options.user == NULL)
944: options.user = optarg;
1.31 markus 945: break;
1.141 stevesk 946:
947: case 'L':
1.324 djm 948: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 949: add_local_forward(&options, &fwd);
950: else {
1.128 fgsch 951: fprintf(stderr,
1.232 djm 952: "Bad local forwarding specification '%s'\n",
1.128 fgsch 953: optarg);
1.257 dtucker 954: exit(255);
1.31 markus 955: }
1.232 djm 956: break;
957:
958: case 'R':
1.464 markus 959: if (parse_forward(&fwd, optarg, 0, 1) ||
960: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 961: add_remote_forward(&options, &fwd);
962: } else {
1.128 fgsch 963: fprintf(stderr,
1.232 djm 964: "Bad remote forwarding specification "
965: "'%s'\n", optarg);
1.257 dtucker 966: exit(255);
1.31 markus 967: }
968: break;
1.108 markus 969:
970: case 'D':
1.324 djm 971: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 972: add_local_forward(&options, &fwd);
1.232 djm 973: } else {
1.322 stevesk 974: fprintf(stderr,
975: "Bad dynamic forwarding specification "
976: "'%s'\n", optarg);
1.257 dtucker 977: exit(255);
1.109 markus 978: }
1.108 markus 979: break;
980:
1.31 markus 981: case 'C':
1.513 dtucker 982: #ifdef WITH_ZLIB
1.31 markus 983: options.compression = 1;
1.513 dtucker 984: #else
985: error("Compression not supported, disabling.");
986: #endif
1.31 markus 987: break;
1.45 markus 988: case 'N':
1.560 djm 989: if (options.session_type != -1 &&
990: options.session_type != SESSION_TYPE_NONE)
991: fatal("Cannot specify -N with -s/SessionType");
992: options.session_type = SESSION_TYPE_NONE;
1.359 djm 993: options.request_tty = REQUEST_TTY_NO;
1.45 markus 994: break;
995: case 'T':
1.359 djm 996: options.request_tty = REQUEST_TTY_NO;
1.45 markus 997: break;
1.31 markus 998: case 'o':
1.205 markus 999: line = xstrdup(optarg);
1.408 djm 1000: if (process_config_line(&options, pw,
1001: host ? host : "", host ? host : "", line,
1002: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 1003: exit(255);
1.378 djm 1004: free(line);
1.31 markus 1005: break;
1.85 djm 1006: case 's':
1.560 djm 1007: if (options.session_type != -1 &&
1008: options.session_type != SESSION_TYPE_SUBSYSTEM)
1009: fatal("Cannot specify -s with -N/SessionType");
1010: options.session_type = SESSION_TYPE_SUBSYSTEM;
1.117 markus 1011: break;
1.214 djm 1012: case 'S':
1.431 mmcc 1013: free(options.control_path);
1.214 djm 1014: options.control_path = xstrdup(optarg);
1015: break;
1.117 markus 1016: case 'b':
1017: options.bind_address = optarg;
1.474 djm 1018: break;
1019: case 'B':
1020: options.bind_interface = optarg;
1.85 djm 1021: break;
1.139 markus 1022: case 'F':
1023: config = optarg;
1024: break;
1.31 markus 1025: default:
1026: usage();
1.1 deraadt 1027: }
1.31 markus 1028: }
1029:
1.462 djm 1030: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
1031: opt_terminated = 1;
1032:
1.128 fgsch 1033: ac -= optind;
1034: av += optind;
1035:
1.329 guenther 1036: if (ac > 0 && !host) {
1.465 millert 1037: int tport;
1038: char *tuser;
1039: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
1040: case -1:
1041: usage();
1042: break;
1043: case 0:
1044: if (options.user == NULL) {
1045: options.user = tuser;
1046: tuser = NULL;
1047: }
1048: free(tuser);
1049: if (options.port == -1 && tport != -1)
1050: options.port = tport;
1051: break;
1052: default:
1.128 fgsch 1053: p = xstrdup(*av);
1.188 markus 1054: cp = strrchr(p, '@');
1.465 millert 1055: if (cp != NULL) {
1056: if (cp == p)
1057: usage();
1058: if (options.user == NULL) {
1059: options.user = p;
1060: p = NULL;
1061: }
1062: *cp++ = '\0';
1063: host = xstrdup(cp);
1064: free(p);
1065: } else
1066: host = p;
1067: break;
1068: }
1.462 djm 1069: if (ac > 1 && !opt_terminated) {
1.189 millert 1070: optind = optreset = 1;
1.128 fgsch 1071: goto again;
1072: }
1.189 millert 1073: ac--, av++;
1.128 fgsch 1074: }
1075:
1.31 markus 1076: /* Check that we got a host name. */
1077: if (!host)
1078: usage();
1079:
1.385 djm 1080: host_arg = xstrdup(host);
1081:
1.402 markus 1082: #ifdef WITH_OPENSSL
1.350 djm 1083: OpenSSL_add_all_algorithms();
1.72 markus 1084: ERR_load_crypto_strings();
1.402 markus 1085: #endif
1.31 markus 1086:
1087: /* Initialize the command to execute on remote host. */
1.482 markus 1088: if ((command = sshbuf_new()) == NULL)
1089: fatal("sshbuf_new failed");
1.1 deraadt 1090:
1.33 markus 1091: /*
1092: * Save the command to execute on the remote host in a buffer. There
1093: * is no limit on the length of the command, except by the maximum
1094: * packet size. Also sets the tty flag if there is no command.
1095: */
1.128 fgsch 1096: if (!ac) {
1.31 markus 1097: /* No command specified - execute shell on a tty. */
1.560 djm 1098: if (options.session_type == SESSION_TYPE_SUBSYSTEM) {
1.128 fgsch 1099: fprintf(stderr,
1100: "You must specify a subsystem to invoke.\n");
1.85 djm 1101: usage();
1102: }
1.31 markus 1103: } else {
1.128 fgsch 1104: /* A command has been specified. Store it into the buffer. */
1105: for (i = 0; i < ac; i++) {
1.482 markus 1106: if ((r = sshbuf_putf(command, "%s%s",
1107: i ? " " : "", av[i])) != 0)
1.540 djm 1108: fatal_fr(r, "buffer error");
1.31 markus 1109: }
1110: }
1111:
1.101 markus 1112: /*
1113: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1114: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1115: */
1.375 dtucker 1116: if (use_syslog && logfile != NULL)
1117: fatal("Can't specify both -y and -E");
1.422 dtucker 1118: if (logfile != NULL)
1.375 dtucker 1119: log_redirect_stderr_to(logfile);
1.325 markus 1120: log_init(argv0,
1.468 djm 1121: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1122: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1123: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1124: SYSLOG_FACILITY_USER : options.log_facility,
1125: !use_syslog);
1.375 dtucker 1126:
1127: if (debug_flag)
1.541 dtucker 1128: logit("%s, %s", SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 1129:
1.400 djm 1130: /* Parse the configuration files */
1.496 djm 1131: process_config_files(host_arg, pw, 0, &want_final_pass);
1132: if (want_final_pass)
1133: debug("configuration requests final Match pass");
1.400 djm 1134:
1135: /* Hostname canonicalisation needs a few options filled. */
1136: fill_default_options_for_canonicalization(&options);
1137:
1138: /* If the user has replaced the hostname then take it into use now */
1139: if (options.hostname != NULL) {
1140: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1141: cp = percent_expand(options.hostname,
1142: "h", host, (char *)NULL);
1143: free(host);
1144: host = cp;
1.408 djm 1145: free(options.hostname);
1146: options.hostname = xstrdup(host);
1.400 djm 1147: }
1148:
1.470 djm 1149: /* Don't lowercase addresses, they will be explicitly canonicalised */
1150: if ((was_addr = is_addr(host)) == 0)
1151: lowercase(host);
1152:
1153: /*
1154: * Try to canonicalize if requested by configuration or the
1155: * hostname is an address.
1156: */
1157: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1158: addrs = resolve_canonicalize(&host, options.port);
1159:
1.139 markus 1160: /*
1.401 djm 1161: * If CanonicalizePermittedCNAMEs have been specified but
1162: * other canonicalization did not happen (by not being requested
1163: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1164: * as a result of CNAME following.
1.401 djm 1165: *
1166: * Try to resolve the bare hostname name using the system resolver's
1167: * usual search rules and then apply the CNAME follow rules.
1168: *
1169: * Skip the lookup if a ProxyCommand is being used unless the user
1170: * has specifically requested canonicalisation for this case via
1171: * CanonicalizeHostname=always
1.139 markus 1172: */
1.443 djm 1173: direct = option_clear_or_none(options.proxy_command) &&
1174: options.jump_host == NULL;
1175: if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1176: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1177: if ((addrs = resolve_host(host, options.port,
1.493 djm 1178: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1179: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1180: if (direct)
1.403 djm 1181: cleanup_exit(255); /* logged in resolve_host */
1182: } else
1.443 djm 1183: check_follow_cname(direct, &host, cname);
1.400 djm 1184: }
1.139 markus 1185:
1.400 djm 1186: /*
1.408 djm 1187: * If canonicalisation is enabled then re-parse the configuration
1188: * files as new stanzas may match.
1.400 djm 1189: */
1.496 djm 1190: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1191: debug("hostname canonicalisation enabled, "
1192: "will re-parse configuration");
1193: want_final_pass = 1;
1194: }
1195:
1196: if (want_final_pass) {
1197: debug("re-parsing configuration");
1.408 djm 1198: free(options.hostname);
1199: options.hostname = xstrdup(host);
1.496 djm 1200: process_config_files(host_arg, pw, 1, NULL);
1.408 djm 1201: /*
1202: * Address resolution happens early with canonicalisation
1203: * enabled and the port number may have changed since, so
1204: * reset it in address list
1205: */
1206: if (addrs != NULL && options.port > 0)
1207: set_addrinfo_port(addrs, options.port);
1.139 markus 1208: }
1.31 markus 1209:
1210: /* Fill configuration defaults. */
1.543 djm 1211: if (fill_default_options(&options) != 0)
1212: cleanup_exit(255);
1.443 djm 1213:
1.534 dtucker 1214: if (options.user == NULL)
1215: options.user = xstrdup(pw->pw_name);
1216:
1.443 djm 1217: /*
1218: * If ProxyJump option specified, then construct a ProxyCommand now.
1219: */
1220: if (options.jump_host != NULL) {
1221: char port_s[8];
1.534 dtucker 1222: const char *jumpuser = options.jump_user, *sshbin = argv0;
1.520 dtucker 1223: int port = options.port, jumpport = options.jump_port;
1224:
1225: if (port <= 0)
1226: port = default_ssh_port();
1227: if (jumpport <= 0)
1228: jumpport = default_ssh_port();
1.534 dtucker 1229: if (jumpuser == NULL)
1230: jumpuser = options.user;
1231: if (strcmp(options.jump_host, host) == 0 && port == jumpport &&
1232: strcmp(options.user, jumpuser) == 0)
1.520 dtucker 1233: fatal("jumphost loop via %s", options.jump_host);
1.478 djm 1234:
1235: /*
1236: * Try to use SSH indicated by argv[0], but fall back to
1237: * "ssh" if it appears unavailable.
1238: */
1239: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1240: sshbin = "ssh";
1.443 djm 1241:
1242: /* Consistency check */
1243: if (options.proxy_command != NULL)
1244: fatal("inconsistent options: ProxyCommand+ProxyJump");
1245: /* Never use FD passing for ProxyJump */
1246: options.proxy_use_fdpass = 0;
1247: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1248: xasprintf(&options.proxy_command,
1.478 djm 1249: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1250: sshbin,
1.443 djm 1251: /* Optional "-l user" argument if jump_user set */
1252: options.jump_user == NULL ? "" : " -l ",
1253: options.jump_user == NULL ? "" : options.jump_user,
1254: /* Optional "-p port" argument if jump_port set */
1255: options.jump_port <= 0 ? "" : " -p ",
1256: options.jump_port <= 0 ? "" : port_s,
1257: /* Optional additional jump hosts ",..." */
1258: options.jump_extra == NULL ? "" : " -J ",
1259: options.jump_extra == NULL ? "" : options.jump_extra,
1260: /* Optional "-F" argumment if -F specified */
1261: config == NULL ? "" : " -F ",
1262: config == NULL ? "" : config,
1263: /* Optional "-v" arguments if -v set */
1264: debug_flag ? " -" : "",
1265: debug_flag, "vvv",
1266: /* Mandatory hostname */
1267: options.jump_host);
1268: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1269: options.proxy_command);
1270: }
1.31 markus 1271:
1.400 djm 1272: if (options.port == 0)
1273: options.port = default_ssh_port();
1.463 djm 1274: channel_set_af(ssh, options.address_family);
1.196 djm 1275:
1.383 djm 1276: /* Tidy and check options */
1277: if (options.host_key_alias != NULL)
1278: lowercase(options.host_key_alias);
1279: if (options.proxy_command != NULL &&
1280: strcmp(options.proxy_command, "-") == 0 &&
1281: options.proxy_use_fdpass)
1282: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.516 markus 1283: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1284: if (options.control_persist && options.control_path != NULL) {
1285: debug("UpdateHostKeys=ask is incompatible with "
1286: "ControlPersist; disabling");
1287: options.update_hostkeys = 0;
1288: } else if (sshbuf_len(command) != 0 ||
1289: options.remote_command != NULL ||
1290: options.request_tty == REQUEST_TTY_NO) {
1291: debug("UpdateHostKeys=ask is incompatible with "
1292: "remote command execution; disabling");
1.517 djm 1293: options.update_hostkeys = 0;
1294: } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1295: /* no point logging anything; user won't see it */
1.516 markus 1296: options.update_hostkeys = 0;
1297: }
1.415 djm 1298: }
1.430 djm 1299: if (options.connection_attempts <= 0)
1300: fatal("Invalid number of ConnectionAttempts");
1301:
1.482 markus 1302: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1303: fatal("Cannot execute command-line and remote command.");
1304:
1305: /* Cannot fork to background if no command. */
1.482 markus 1306: if (fork_after_authentication_flag && sshbuf_len(command) == 0 &&
1.562 djm 1307: options.remote_command == NULL &&
1308: options.session_type != SESSION_TYPE_NONE)
1.461 bluhm 1309: fatal("Cannot fork into background without a command "
1310: "to execute.");
1311:
1.31 markus 1312: /* reinit */
1.452 dtucker 1313: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.559 djm 1314: for (j = 0; j < options.num_log_verbose; j++) {
1315: if (strcasecmp(options.log_verbose[j], "none") == 0)
1316: break;
1.539 djm 1317: log_verbose_add(options.log_verbose[j]);
1.559 djm 1318: }
1.370 djm 1319:
1320: if (options.request_tty == REQUEST_TTY_YES ||
1321: options.request_tty == REQUEST_TTY_FORCE)
1322: tty_flag = 1;
1323:
1324: /* Allocate a tty by default if no command specified. */
1.482 markus 1325: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1326: tty_flag = options.request_tty != REQUEST_TTY_NO;
1327:
1328: /* Force no tty */
1.447 markus 1329: if (options.request_tty == REQUEST_TTY_NO ||
1330: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
1.370 djm 1331: tty_flag = 0;
1332: /* Do not allocate a tty if stdin is not a tty. */
1.563 ! djm 1333: if ((!isatty(fileno(stdin)) || options.stdin_null) &&
1.370 djm 1334: options.request_tty != REQUEST_TTY_FORCE) {
1335: if (tty_flag)
1336: logit("Pseudo-terminal will not be allocated because "
1337: "stdin is not a terminal.");
1338: tty_flag = 0;
1339: }
1.343 djm 1340:
1.466 djm 1341: /* Set up strings used to percent_expand() arguments */
1.544 djm 1342: cinfo = xcalloc(1, sizeof(*cinfo));
1.358 djm 1343: if (gethostname(thishost, sizeof(thishost)) == -1)
1344: fatal("gethostname: %s", strerror(errno));
1.544 djm 1345: cinfo->thishost = xstrdup(thishost);
1346: thishost[strcspn(thishost, ".")] = '\0';
1347: cinfo->shorthost = xstrdup(thishost);
1348: xasprintf(&cinfo->portstr, "%d", options.port);
1349: xasprintf(&cinfo->uidstr, "%llu",
1.479 djm 1350: (unsigned long long)pw->pw_uid);
1.544 djm 1351: cinfo->keyalias = xstrdup(options.host_key_alias ?
1352: options.host_key_alias : host_arg);
1353: cinfo->conn_hash_hex = ssh_connection_hash(cinfo->thishost, host,
1354: cinfo->portstr, options.user);
1355: cinfo->host_arg = xstrdup(host_arg);
1356: cinfo->remhost = xstrdup(host);
1357: cinfo->remuser = xstrdup(options.user);
1358: cinfo->homedir = xstrdup(pw->pw_dir);
1359: cinfo->locuser = xstrdup(pw->pw_name);
1.405 djm 1360:
1.466 djm 1361: /*
1362: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1363: * after port-forwarding is set up, so it may pick up any local
1364: * tunnel interface name allocated.
1365: */
1.461 bluhm 1366: if (options.remote_command != NULL) {
1367: debug3("expanding RemoteCommand: %s", options.remote_command);
1368: cp = options.remote_command;
1.527 dtucker 1369: options.remote_command = default_client_percent_expand(cp,
1.544 djm 1370: cinfo);
1.461 bluhm 1371: debug3("expanded RemoteCommand: %s", options.remote_command);
1372: free(cp);
1.482 markus 1373: if ((r = sshbuf_put(command, options.remote_command,
1374: strlen(options.remote_command))) != 0)
1.540 djm 1375: fatal_fr(r, "buffer error");
1.304 dtucker 1376: }
1.31 markus 1377:
1.214 djm 1378: if (options.control_path != NULL) {
1.490 dtucker 1379: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1380: free(options.control_path);
1.528 dtucker 1381: options.control_path = default_client_percent_dollar_expand(cp,
1.544 djm 1382: cinfo);
1.378 djm 1383: free(cp);
1.214 djm 1384: }
1.408 djm 1385:
1.522 dtucker 1386: if (options.identity_agent != NULL) {
1387: p = tilde_expand_filename(options.identity_agent, getuid());
1.544 djm 1388: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1389: free(p);
1390: free(options.identity_agent);
1391: options.identity_agent = cp;
1392: }
1393:
1394: if (options.forward_agent_sock_path != NULL) {
1395: p = tilde_expand_filename(options.forward_agent_sock_path,
1396: getuid());
1.544 djm 1397: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1398: free(p);
1399: free(options.forward_agent_sock_path);
1400: options.forward_agent_sock_path = cp;
1.552 djm 1401: if (stat(options.forward_agent_sock_path, &st) != 0) {
1402: error("Cannot forward agent socket path \"%s\": %s",
1403: options.forward_agent_sock_path, strerror(errno));
1404: if (options.exit_on_forward_failure)
1405: cleanup_exit(255);
1406: }
1.532 dtucker 1407: }
1408:
1.545 djm 1409: if (options.num_system_hostfiles > 0 &&
1410: strcasecmp(options.system_hostfiles[0], "none") == 0) {
1411: if (options.num_system_hostfiles > 1)
1412: fatal("Invalid GlobalKnownHostsFiles: \"none\" "
1413: "appears with other entries");
1414: free(options.system_hostfiles[0]);
1415: options.system_hostfiles[0] = NULL;
1416: options.num_system_hostfiles = 0;
1417: }
1418:
1419: if (options.num_user_hostfiles > 0 &&
1420: strcasecmp(options.user_hostfiles[0], "none") == 0) {
1421: if (options.num_user_hostfiles > 1)
1422: fatal("Invalid UserKnownHostsFiles: \"none\" "
1423: "appears with other entries");
1424: free(options.user_hostfiles[0]);
1425: options.user_hostfiles[0] = NULL;
1426: options.num_user_hostfiles = 0;
1427: }
1.532 dtucker 1428: for (j = 0; j < options.num_user_hostfiles; j++) {
1.545 djm 1429: if (options.user_hostfiles[j] == NULL)
1430: continue;
1431: cp = tilde_expand_filename(options.user_hostfiles[j], getuid());
1432: p = default_client_percent_dollar_expand(cp, cinfo);
1433: if (strcmp(options.user_hostfiles[j], p) != 0)
1434: debug3("expanded UserKnownHostsFile '%s' -> "
1435: "'%s'", options.user_hostfiles[j], p);
1436: free(options.user_hostfiles[j]);
1437: free(cp);
1438: options.user_hostfiles[j] = p;
1.522 dtucker 1439: }
1440:
1.527 dtucker 1441: for (i = 0; i < options.num_local_forwards; i++) {
1442: if (options.local_forwards[i].listen_path != NULL) {
1443: cp = options.local_forwards[i].listen_path;
1444: p = options.local_forwards[i].listen_path =
1.544 djm 1445: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1446: if (strcmp(cp, p) != 0)
1447: debug3("expanded LocalForward listen path "
1448: "'%s' -> '%s'", cp, p);
1449: free(cp);
1450: }
1451: if (options.local_forwards[i].connect_path != NULL) {
1452: cp = options.local_forwards[i].connect_path;
1453: p = options.local_forwards[i].connect_path =
1.544 djm 1454: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1455: if (strcmp(cp, p) != 0)
1456: debug3("expanded LocalForward connect path "
1457: "'%s' -> '%s'", cp, p);
1458: free(cp);
1459: }
1460: }
1461:
1462: for (i = 0; i < options.num_remote_forwards; i++) {
1463: if (options.remote_forwards[i].listen_path != NULL) {
1464: cp = options.remote_forwards[i].listen_path;
1465: p = options.remote_forwards[i].listen_path =
1.544 djm 1466: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1467: if (strcmp(cp, p) != 0)
1468: debug3("expanded RemoteForward listen path "
1469: "'%s' -> '%s'", cp, p);
1470: free(cp);
1471: }
1472: if (options.remote_forwards[i].connect_path != NULL) {
1473: cp = options.remote_forwards[i].connect_path;
1474: p = options.remote_forwards[i].connect_path =
1.544 djm 1475: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1476: if (strcmp(cp, p) != 0)
1477: debug3("expanded RemoteForward connect path "
1478: "'%s' -> '%s'", cp, p);
1479: free(cp);
1480: }
1481: }
1482:
1.408 djm 1483: if (config_test) {
1484: dump_client_config(&options, host);
1485: exit(0);
1.508 djm 1486: }
1487:
1488: /* Expand SecurityKeyProvider if it refers to an environment variable */
1489: if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1490: strlen(options.sk_provider) > 1) {
1491: if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1.518 naddy 1492: debug("Authenticator provider %s did not resolve; "
1.508 djm 1493: "disabling", options.sk_provider);
1494: free(options.sk_provider);
1495: options.sk_provider = NULL;
1496: } else {
1497: debug2("resolved SecurityKeyProvider %s => %s",
1498: options.sk_provider, cp);
1499: free(options.sk_provider);
1500: options.sk_provider = xstrdup(cp);
1501: }
1.408 djm 1502: }
1.405 djm 1503:
1.312 djm 1504: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1505: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1506: if (options.control_path != NULL) {
1507: int sock;
1508: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1509: ssh_packet_set_connection(ssh, sock, sock);
1.499 djm 1510: ssh_packet_set_mux(ssh);
1.447 markus 1511: goto skip_connect;
1512: }
1513: }
1.401 djm 1514:
1515: /*
1516: * If hostname canonicalisation was not enabled, then we may not
1517: * have yet resolved the hostname. Do so now.
1518: */
1519: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1520: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1521: if ((addrs = resolve_host(host, options.port, 1,
1522: cname, sizeof(cname))) == NULL)
1523: cleanup_exit(255); /* resolve_host logs the error */
1524: }
1.214 djm 1525:
1.542 dtucker 1526: if (options.connection_timeout >= INT_MAX/1000)
1527: timeout_ms = INT_MAX;
1528: else
1529: timeout_ms = options.connection_timeout * 1000;
1.303 djm 1530:
1.77 markus 1531: /* Open a connection to the remote host. */
1.511 beck 1532: if (ssh_connect(ssh, host, host_arg, addrs, &hostaddr, options.port,
1.538 kn 1533: options.connection_attempts,
1.488 dtucker 1534: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1535: exit(255);
1.31 markus 1536:
1.391 djm 1537: if (addrs != NULL)
1538: freeaddrinfo(addrs);
1539:
1.499 djm 1540: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1541: options.server_alive_count_max);
1542:
1.303 djm 1543: if (timeout_ms > 0)
1544: debug3("timeout: %d ms remain after connect", timeout_ms);
1545:
1.33 markus 1546: /*
1.485 dtucker 1547: * If we successfully made the connection and we have hostbased auth
1548: * enabled, load the public keys so we can later use the ssh-keysign
1549: * helper to sign challenges.
1.33 markus 1550: */
1.112 markus 1551: sensitive_data.nkeys = 0;
1552: sensitive_data.keys = NULL;
1.457 djm 1553: if (options.hostbased_authentication) {
1.486 dtucker 1554: sensitive_data.nkeys = 10;
1.274 deraadt 1555: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.483 markus 1556: sizeof(struct sshkey));
1557:
1558: /* XXX check errors? */
1.486 dtucker 1559: #define L_PUBKEY(p,o) do { \
1560: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1561: fatal_f("pubkey out of array bounds"); \
1.483 markus 1562: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.486 dtucker 1563: p, "pubkey"); \
1564: } while (0)
1565: #define L_CERT(p,o) do { \
1566: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1567: fatal_f("cert out of array bounds"); \
1.486 dtucker 1568: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), p, "cert"); \
1569: } while (0)
1.177 markus 1570:
1.485 dtucker 1571: if (options.hostbased_authentication == 1) {
1.486 dtucker 1572: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1573: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1574: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1575: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1576: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1577: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1578: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1579: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1580: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1581: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.173 markus 1582: }
1.367 djm 1583: }
1.31 markus 1584:
1.104 markus 1585: /* load options.identity_files */
1.544 djm 1586: load_public_identity_files(cinfo);
1.439 markus 1587:
1.476 djm 1588: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1589: if (options.identity_agent &&
1590: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1591: if (strcmp(options.identity_agent, "none") == 0) {
1592: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1593: } else {
1.522 dtucker 1594: cp = options.identity_agent;
1.528 dtucker 1595: /* legacy (limited) format */
1596: if (cp[0] == '$' && cp[1] != '{') {
1.494 djm 1597: if (!valid_env_name(cp + 1)) {
1598: fatal("Invalid IdentityAgent "
1599: "environment variable name %s", cp);
1600: }
1601: if ((p = getenv(cp + 1)) == NULL)
1602: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1603: else
1604: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1605: } else {
1606: /* identity_agent specifies a path directly */
1607: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1608: }
1.510 djm 1609: }
1610: }
1611:
1.522 dtucker 1612: if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1.526 djm 1613: cp = options.forward_agent_sock_path;
1.510 djm 1614: if (cp[0] == '$') {
1615: if (!valid_env_name(cp + 1)) {
1616: fatal("Invalid ForwardAgent environment variable name %s", cp);
1617: }
1618: if ((p = getenv(cp + 1)) != NULL)
1619: forward_agent_sock_path = p;
1620: else
1621: options.forward_agent = 0;
1622: free(cp);
1623: } else {
1624: forward_agent_sock_path = cp;
1.439 markus 1625: }
1626: }
1.104 markus 1627:
1628: /* Expand ~ in known host file names. */
1.361 djm 1629: tilde_expand_paths(options.system_hostfiles,
1630: options.num_system_hostfiles);
1631: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1632:
1.512 dtucker 1633: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1634: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1635:
1.316 djm 1636: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1637: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.546 djm 1638: options.port, pw, timeout_ms, cinfo);
1.339 djm 1639:
1.499 djm 1640: if (ssh_packet_connection_is_on_socket(ssh)) {
1.339 djm 1641: verbose("Authenticated to %s ([%s]:%d).", host,
1.437 djm 1642: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
1.339 djm 1643: } else {
1644: verbose("Authenticated to %s (via proxy).", host);
1645: }
1.31 markus 1646:
1.112 markus 1647: /* We no longer need the private host keys. Clear them now. */
1648: if (sensitive_data.nkeys != 0) {
1649: for (i = 0; i < sensitive_data.nkeys; i++) {
1650: if (sensitive_data.keys[i] != NULL) {
1651: /* Destroys contents safely */
1652: debug3("clear hostkey %d", i);
1.483 markus 1653: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1654: sensitive_data.keys[i] = NULL;
1655: }
1656: }
1.378 djm 1657: free(sensitive_data.keys);
1.134 markus 1658: }
1659: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1660: free(options.identity_files[i]);
1661: options.identity_files[i] = NULL;
1.134 markus 1662: if (options.identity_keys[i]) {
1.483 markus 1663: sshkey_free(options.identity_keys[i]);
1.134 markus 1664: options.identity_keys[i] = NULL;
1665: }
1.112 markus 1666: }
1.426 djm 1667: for (i = 0; i < options.num_certificate_files; i++) {
1668: free(options.certificate_files[i]);
1669: options.certificate_files[i] = NULL;
1670: }
1.553 djm 1671:
1672: #ifdef ENABLE_PKCS11
1673: (void)pkcs11_del_provider(options.pkcs11_provider);
1674: #endif
1.31 markus 1675:
1.447 markus 1676: skip_connect:
1.544 djm 1677: exit_status = ssh_session2(ssh, cinfo);
1678: ssh_conn_info_free(cinfo);
1.499 djm 1679: ssh_packet_close(ssh);
1.186 djm 1680:
1.312 djm 1681: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1682: unlink(options.control_path);
1683:
1.353 djm 1684: /* Kill ProxyCommand if it is running. */
1685: ssh_kill_proxy_command();
1.186 djm 1686:
1.45 markus 1687: return exit_status;
1688: }
1689:
1.344 djm 1690: static void
1691: control_persist_detach(void)
1692: {
1693: pid_t pid;
1694:
1.540 djm 1695: debug_f("backgrounding master process");
1.344 djm 1696:
1.473 djm 1697: /*
1698: * master (current process) into the background, and make the
1699: * foreground process a client of the backgrounded master.
1700: */
1.344 djm 1701: switch ((pid = fork())) {
1702: case -1:
1.540 djm 1703: fatal_f("fork: %s", strerror(errno));
1.344 djm 1704: case 0:
1705: /* Child: master process continues mainloop */
1.473 djm 1706: break;
1707: default:
1.531 djm 1708: /* Parent: set up mux client to connect to backgrounded master */
1.540 djm 1709: debug2_f("background process is %ld", (long)pid);
1.563 ! djm 1710: options.stdin_null = ostdin_null_flag;
1.359 djm 1711: options.request_tty = orequest_tty;
1.344 djm 1712: tty_flag = otty_flag;
1.561 djm 1713: options.session_type = osession_type;
1.473 djm 1714: close(muxserver_sock);
1715: muxserver_sock = -1;
1.351 markus 1716: options.control_master = SSHCTL_MASTER_NO;
1.473 djm 1717: muxclient(options.control_path);
1.344 djm 1718: /* muxclient() doesn't return on success. */
1.473 djm 1719: fatal("Failed to connect to new control master");
1720: }
1.537 djm 1721: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1722: error_f("stdfd_devnull failed");
1.381 djm 1723: daemon(1, 1);
1.362 djm 1724: setproctitle("%s [mux]", options.control_path);
1.344 djm 1725: }
1726:
1727: /* Do fork() after authentication. Used by "ssh -f" */
1728: static void
1729: fork_postauth(void)
1730: {
1731: if (need_controlpersist_detach)
1732: control_persist_detach();
1733: debug("forking to background");
1734: fork_after_authentication_flag = 0;
1.505 deraadt 1735: if (daemon(1, 1) == -1)
1.344 djm 1736: fatal("daemon() failed: %.200s", strerror(errno));
1.537 djm 1737: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1738: error_f("stdfd_devnull failed");
1.344 djm 1739: }
1740:
1.523 djm 1741: static void
1742: forwarding_success(void)
1743: {
1.524 djm 1744: if (forward_confirms_pending == -1)
1745: return;
1746: if (--forward_confirms_pending == 0) {
1.540 djm 1747: debug_f("all expected forwarding replies received");
1.523 djm 1748: if (fork_after_authentication_flag)
1749: fork_postauth();
1.524 djm 1750: } else {
1.540 djm 1751: debug2_f("%d expected forwarding replies remaining",
1752: forward_confirms_pending);
1.523 djm 1753: }
1754: }
1755:
1.315 djm 1756: /* Callback for remote forward global requests */
1757: static void
1.463 djm 1758: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1759: {
1.406 millert 1760: struct Forward *rfwd = (struct Forward *)ctxt;
1.499 djm 1761: u_int port;
1762: int r;
1.315 djm 1763:
1.324 djm 1764: /* XXX verbose() on failure? */
1.404 markus 1765: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1766: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1767: rfwd->listen_path ? rfwd->listen_path :
1768: rfwd->listen_host ? rfwd->listen_host : "",
1769: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1770: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1771: rfwd->connect_host, rfwd->connect_port);
1772: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1773: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1.499 djm 1774: if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1.540 djm 1775: fatal_fr(r, "parse packet");
1.499 djm 1776: if (port > 65535) {
1777: error("Invalid allocated port %u for remote "
1778: "forward to %s:%d", port,
1779: rfwd->connect_host, rfwd->connect_port);
1780: /* Ensure failure processing runs below */
1781: type = SSH2_MSG_REQUEST_FAILURE;
1782: channel_update_permission(ssh,
1783: rfwd->handle, -1);
1784: } else {
1785: rfwd->allocated_port = (int)port;
1786: logit("Allocated port %u for remote "
1787: "forward to %s:%d",
1788: rfwd->allocated_port, rfwd->connect_host,
1789: rfwd->connect_port);
1790: channel_update_permission(ssh,
1791: rfwd->handle, rfwd->allocated_port);
1792: }
1.366 markus 1793: } else {
1.480 djm 1794: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1795: }
1.324 djm 1796: }
1.468 djm 1797:
1.315 djm 1798: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1799: if (options.exit_on_forward_failure) {
1800: if (rfwd->listen_path != NULL)
1801: fatal("Error: remote port forwarding failed "
1802: "for listen path %s", rfwd->listen_path);
1803: else
1804: fatal("Error: remote port forwarding failed "
1805: "for listen port %d", rfwd->listen_port);
1806: } else {
1807: if (rfwd->listen_path != NULL)
1808: logit("Warning: remote port forwarding failed "
1809: "for listen path %s", rfwd->listen_path);
1810: else
1811: logit("Warning: remote port forwarding failed "
1812: "for listen port %d", rfwd->listen_port);
1813: }
1.315 djm 1814: }
1.523 djm 1815: forwarding_success();
1.315 djm 1816: }
1817:
1.126 itojun 1818: static void
1.463 djm 1819: client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
1.331 dtucker 1820: {
1821: debug("stdio forwarding: done");
1822: cleanup_exit(0);
1823: }
1824:
1.368 djm 1825: static void
1.463 djm 1826: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1827: {
1828: if (!success)
1829: fatal("stdio forwarding failed");
1830: }
1831:
1832: static void
1.523 djm 1833: ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
1834: {
1835: if (!success) {
1836: error("Tunnel forwarding failed");
1837: if (options.exit_on_forward_failure)
1838: cleanup_exit(255);
1839: }
1840:
1.540 djm 1841: debug_f("tunnel forward established, id=%d", id);
1.523 djm 1842: forwarding_success();
1843: }
1844:
1845: static void
1.463 djm 1846: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1847: {
1848: Channel *c;
1.332 djm 1849: int in, out;
1.331 dtucker 1850:
1.441 dtucker 1851: if (options.stdio_forward_host == NULL)
1.368 djm 1852: return;
1853:
1.540 djm 1854: debug3_f("%s:%d", options.stdio_forward_host,
1.441 dtucker 1855: options.stdio_forward_port);
1.332 djm 1856:
1.505 deraadt 1857: if ((in = dup(STDIN_FILENO)) == -1 ||
1858: (out = dup(STDOUT_FILENO)) == -1)
1.557 djm 1859: fatal_f("dup() in/out failed");
1.463 djm 1860: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.557 djm 1861: options.stdio_forward_port, in, out,
1862: CHANNEL_NONBLOCK_STDIO)) == NULL)
1.540 djm 1863: fatal_f("channel_connect_stdio_fwd failed");
1.463 djm 1864: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1865: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1866: }
1867:
1868: static void
1.551 markus 1869: ssh_init_forward_permissions(struct ssh *ssh, const char *what, char **opens,
1870: u_int num_opens)
1871: {
1872: u_int i;
1873: int port;
1874: char *addr, *arg, *oarg, ch;
1875: int where = FORWARD_LOCAL;
1876:
1877: channel_clear_permission(ssh, FORWARD_ADM, where);
1878: if (num_opens == 0)
1879: return; /* permit any */
1880:
1881: /* handle keywords: "any" / "none" */
1882: if (num_opens == 1 && strcmp(opens[0], "any") == 0)
1883: return;
1884: if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
1885: channel_disable_admin(ssh, where);
1886: return;
1887: }
1888: /* Otherwise treat it as a list of permitted host:port */
1889: for (i = 0; i < num_opens; i++) {
1890: oarg = arg = xstrdup(opens[i]);
1891: ch = '\0';
1892: addr = hpdelim2(&arg, &ch);
1893: if (addr == NULL || ch == '/')
1894: fatal_f("missing host in %s", what);
1895: addr = cleanhostname(addr);
1896: if (arg == NULL || ((port = permitopen_port(arg)) < 0))
1897: fatal_f("bad port number in %s", what);
1898: /* Send it to channels layer */
1899: channel_add_permission(ssh, FORWARD_ADM,
1900: where, addr, port);
1901: free(oarg);
1902: }
1903: }
1904:
1905: static void
1.466 djm 1906: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1907: {
1.86 markus 1908: int success = 0;
1.70 markus 1909: int i;
1.551 markus 1910:
1911: ssh_init_forward_permissions(ssh, "permitremoteopen",
1912: options.permitted_remote_opens,
1913: options.num_permitted_remote_opens);
1.331 dtucker 1914:
1.524 djm 1915: if (options.exit_on_forward_failure)
1916: forward_confirms_pending = 0; /* track pending requests */
1.70 markus 1917: /* Initiate local TCP/IP port forwardings. */
1918: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1919: debug("Local connections to %.200s:%d forwarded to remote "
1920: "address %.200s:%d",
1.406 millert 1921: (options.local_forwards[i].listen_path != NULL) ?
1922: options.local_forwards[i].listen_path :
1.234 deraadt 1923: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1924: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1925: options.local_forwards[i].listen_host,
1926: options.local_forwards[i].listen_port,
1.406 millert 1927: (options.local_forwards[i].connect_path != NULL) ?
1928: options.local_forwards[i].connect_path :
1.232 djm 1929: options.local_forwards[i].connect_host,
1930: options.local_forwards[i].connect_port);
1.463 djm 1931: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1932: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1933: }
1.283 markus 1934: if (i > 0 && success != i && options.exit_on_forward_failure)
1935: fatal("Could not request local forwarding.");
1.86 markus 1936: if (i > 0 && success == 0)
1937: error("Could not request local forwarding.");
1.70 markus 1938:
1939: /* Initiate remote TCP/IP port forwardings. */
1940: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1941: debug("Remote connections from %.200s:%d forwarded to "
1942: "local address %.200s:%d",
1.406 millert 1943: (options.remote_forwards[i].listen_path != NULL) ?
1944: options.remote_forwards[i].listen_path :
1.248 djm 1945: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1946: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1947: options.remote_forwards[i].listen_port,
1.406 millert 1948: (options.remote_forwards[i].connect_path != NULL) ?
1949: options.remote_forwards[i].connect_path :
1.232 djm 1950: options.remote_forwards[i].connect_host,
1951: options.remote_forwards[i].connect_port);
1.523 djm 1952: if ((options.remote_forwards[i].handle =
1.463 djm 1953: channel_request_remote_forwarding(ssh,
1.523 djm 1954: &options.remote_forwards[i])) >= 0) {
1.463 djm 1955: client_register_global_confirm(
1956: ssh_confirm_remote_forward,
1.366 markus 1957: &options.remote_forwards[i]);
1.523 djm 1958: forward_confirms_pending++;
1959: } else if (options.exit_on_forward_failure)
1960: fatal("Could not request remote forwarding.");
1961: else
1962: logit("Warning: Could not request remote forwarding.");
1.70 markus 1963: }
1.301 djm 1964:
1965: /* Initiate tunnel forwarding. */
1966: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1967: if ((*ifname = client_request_tun_fwd(ssh,
1968: options.tun_open, options.tun_local,
1.523 djm 1969: options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
1970: forward_confirms_pending++;
1971: else if (options.exit_on_forward_failure)
1972: fatal("Could not request tunnel forwarding.");
1973: else
1974: error("Could not request tunnel forwarding.");
1.524 djm 1975: }
1976: if (forward_confirms_pending > 0) {
1.540 djm 1977: debug_f("expecting replies for %d forwards",
1.524 djm 1978: forward_confirms_pending);
1.468 djm 1979: }
1.70 markus 1980: }
1981:
1.126 itojun 1982: static void
1.70 markus 1983: check_agent_present(void)
1984: {
1.412 djm 1985: int r;
1986:
1.70 markus 1987: if (options.forward_agent) {
1.254 djm 1988: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1989: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1990: options.forward_agent = 0;
1.412 djm 1991: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.540 djm 1992: debug_r(r, "ssh_get_authentication_socket");
1.412 djm 1993: }
1.70 markus 1994: }
1995: }
1996:
1.214 djm 1997: static void
1.463 djm 1998: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 1999: {
1.215 djm 2000: extern char **environ;
1.558 djm 2001: const char *display, *term;
1.499 djm 2002: int r, interactive = tty_flag;
1.433 djm 2003: char *proto = NULL, *data = NULL;
1.337 djm 2004:
2005: if (!success)
2006: return; /* No need for error message, channels code sens one */
1.215 djm 2007:
1.248 djm 2008: display = getenv("DISPLAY");
1.417 djm 2009: if (display == NULL && options.forward_x11)
2010: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 2011: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 2012: options.xauth_location, options.forward_x11_trusted,
2013: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 2014: /* Request forwarding with authentication spoofing. */
1.316 djm 2015: debug("Requesting X11 forwarding with authentication "
2016: "spoofing.");
1.463 djm 2017: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 2018: data, 1);
1.463 djm 2019: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 2020: /* XXX exit_on_forward_failure */
1.80 markus 2021: interactive = 1;
1.50 markus 2022: }
2023:
1.70 markus 2024: check_agent_present();
2025: if (options.forward_agent) {
2026: debug("Requesting authentication agent forwarding.");
1.463 djm 2027: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 2028: if ((r = sshpkt_send(ssh)) != 0)
1.540 djm 2029: fatal_fr(r, "send packet");
1.212 djm 2030: }
1.369 dtucker 2031:
2032: /* Tell the packet module whether this is an interactive session. */
1.499 djm 2033: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 2034: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 2035:
1.558 djm 2036: if ((term = lookup_env_in_list("TERM", options.setenv,
2037: options.num_setenv)) == NULL || *term == '\0')
2038: term = getenv("TERM");
1.562 djm 2039: client_session2_setup(ssh, id, tty_flag,
2040: options.session_type == SESSION_TYPE_SUBSYSTEM, term,
1.482 markus 2041: NULL, fileno(stdin), command, environ);
1.45 markus 2042: }
2043:
1.143 markus 2044: /* open new channel for a session */
1.126 itojun 2045: static int
1.463 djm 2046: ssh_session2_open(struct ssh *ssh)
1.45 markus 2047: {
1.118 markus 2048: Channel *c;
2049: int window, packetmax, in, out, err;
1.60 markus 2050:
1.563 ! djm 2051: if (options.stdin_null) {
1.93 itojun 2052: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 2053: } else {
2054: in = dup(STDIN_FILENO);
2055: }
1.60 markus 2056: out = dup(STDOUT_FILENO);
2057: err = dup(STDERR_FILENO);
1.45 markus 2058:
1.505 deraadt 2059: if (in == -1 || out == -1 || err == -1)
1.62 markus 2060: fatal("dup() in/out/err failed");
1.45 markus 2061:
1.65 markus 2062: window = CHAN_SES_WINDOW_DEFAULT;
2063: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 2064: if (tty_flag) {
2065: window >>= 1;
2066: packetmax >>= 1;
1.45 markus 2067: }
1.463 djm 2068: c = channel_new(ssh,
1.45 markus 2069: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 2070: window, packetmax, CHAN_EXTENDED_WRITE,
1.557 djm 2071: "client-session", CHANNEL_NONBLOCK_STDIO);
1.45 markus 2072:
1.540 djm 2073: debug3_f("channel_new: %d", c->self);
1.106 markus 2074:
1.463 djm 2075: channel_send_open(ssh, c->self);
1.560 djm 2076: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2077: channel_register_open_confirm(ssh, c->self,
1.310 djm 2078: ssh_session2_setup, NULL);
1.106 markus 2079:
1.118 markus 2080: return c->self;
1.106 markus 2081: }
2082:
1.126 itojun 2083: static int
1.544 djm 2084: ssh_session2(struct ssh *ssh, const struct ssh_conn_info *cinfo)
1.106 markus 2085: {
1.537 djm 2086: int r, id = -1;
1.466 djm 2087: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 2088:
2089: /* XXX should be pre-session */
1.368 djm 2090: if (!options.control_persist)
1.463 djm 2091: ssh_init_stdio_forwarding(ssh);
1.466 djm 2092:
2093: ssh_init_forwarding(ssh, &tun_fwd_ifname);
2094:
2095: if (options.local_command != NULL) {
2096: debug3("expanding LocalCommand: %s", options.local_command);
2097: cp = options.local_command;
2098: options.local_command = percent_expand(cp,
1.546 djm 2099: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.466 djm 2100: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2101: (char *)NULL);
2102: debug3("expanded LocalCommand: %s", options.local_command);
2103: free(cp);
2104: }
1.106 markus 2105:
1.344 djm 2106: /* Start listening for multiplex clients */
1.499 djm 2107: if (!ssh_packet_get_mux(ssh))
1.463 djm 2108: muxserver_listen(ssh);
1.344 djm 2109:
1.473 djm 2110: /*
1.368 djm 2111: * If we are in control persist mode and have a working mux listen
2112: * socket, then prepare to background ourselves and have a foreground
1.531 djm 2113: * client attach as a control client.
1.368 djm 2114: * NB. we must save copies of the flags that we override for
1.531 djm 2115: * the backgrounding, since we defer attachment of the client until
1.344 djm 2116: * after the connection is fully established (in particular,
2117: * async rfwd replies have been received for ExitOnForwardFailure).
2118: */
1.473 djm 2119: if (options.control_persist && muxserver_sock != -1) {
1.563 ! djm 2120: ostdin_null_flag = options.stdin_null;
1.560 djm 2121: osession_type = options.session_type;
1.359 djm 2122: orequest_tty = options.request_tty;
1.344 djm 2123: otty_flag = tty_flag;
1.563 ! djm 2124: options.stdin_null = 1;
1.560 djm 2125: options.session_type = SESSION_TYPE_NONE;
1.473 djm 2126: tty_flag = 0;
1.556 djm 2127: if (!fork_after_authentication_flag &&
1.562 djm 2128: (osession_type != SESSION_TYPE_NONE ||
2129: options.stdio_forward_host != NULL))
1.344 djm 2130: need_controlpersist_detach = 1;
2131: fork_after_authentication_flag = 1;
1.473 djm 2132: }
1.368 djm 2133: /*
2134: * ControlPersist mux listen socket setup failed, attempt the
2135: * stdio forward setup that we skipped earlier.
2136: */
2137: if (options.control_persist && muxserver_sock == -1)
1.463 djm 2138: ssh_init_stdio_forwarding(ssh);
1.344 djm 2139:
1.560 djm 2140: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2141: id = ssh_session2_open(ssh);
1.379 djm 2142: else {
1.499 djm 2143: ssh_packet_set_interactive(ssh,
1.379 djm 2144: options.control_master == SSHCTL_MASTER_NO,
2145: options.ip_qos_interactive, options.ip_qos_bulk);
2146: }
1.314 djm 2147:
2148: /* If we don't expect to open a new session, then disallow it */
1.319 markus 2149: if (options.control_master == SSHCTL_MASTER_NO &&
1.549 djm 2150: (ssh->compat & SSH_NEW_OPENSSH)) {
1.314 djm 2151: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 2152: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2153: (r = sshpkt_put_cstring(ssh,
2154: "no-more-sessions@openssh.com")) != 0 ||
2155: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2156: (r = sshpkt_send(ssh)) != 0)
1.540 djm 2157: fatal_fr(r, "send packet");
1.314 djm 2158: }
1.255 reyk 2159:
2160: /* Execute a local command */
2161: if (options.local_command != NULL &&
2162: options.permit_local_command)
2163: ssh_local_cmd(options.local_command);
1.467 djm 2164:
2165: /*
2166: * stdout is now owned by the session channel; clobber it here
2167: * so future channel closes are propagated to the local fd.
2168: * NB. this can only happen after LocalCommand has completed,
2169: * as it may want to write to stdout.
2170: */
1.537 djm 2171: if (!need_controlpersist_detach && stdfd_devnull(0, 1, 0) == -1)
1.540 djm 2172: error_f("stdfd_devnull failed");
1.301 djm 2173:
1.342 djm 2174: /*
2175: * If requested and we are not interested in replies to remote
2176: * forwarding requests, then let ssh continue in the background.
2177: */
1.344 djm 2178: if (fork_after_authentication_flag) {
2179: if (options.exit_on_forward_failure &&
2180: options.num_remote_forwards > 0) {
2181: debug("deferring postauth fork until remote forward "
2182: "confirmation received");
2183: } else
2184: fork_postauth();
1.318 djm 2185: }
1.31 markus 2186:
1.463 djm 2187: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2188: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2189: }
2190:
1.426 djm 2191: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2192: static void
1.544 djm 2193: load_public_identity_files(const struct ssh_conn_info *cinfo)
1.104 markus 2194: {
1.466 djm 2195: char *filename, *cp;
1.460 markus 2196: struct sshkey *public;
1.426 djm 2197: int i;
2198: u_int n_ids, n_certs;
1.335 djm 2199: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2200: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2201: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2202: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2203: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2204: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2205: #ifdef ENABLE_PKCS11
1.514 djm 2206: struct sshkey **keys = NULL;
2207: char **comments = NULL;
1.333 markus 2208: int nkeys;
1.335 djm 2209: #endif /* PKCS11 */
1.104 markus 2210:
1.426 djm 2211: n_ids = n_certs = 0;
1.398 tedu 2212: memset(identity_files, 0, sizeof(identity_files));
2213: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2214: memset(identity_file_userprovided, 0,
2215: sizeof(identity_file_userprovided));
1.426 djm 2216: memset(certificate_files, 0, sizeof(certificate_files));
2217: memset(certificates, 0, sizeof(certificates));
1.484 djm 2218: memset(certificate_file_userprovided, 0,
2219: sizeof(certificate_file_userprovided));
1.335 djm 2220:
2221: #ifdef ENABLE_PKCS11
1.333 markus 2222: if (options.pkcs11_provider != NULL &&
1.167 markus 2223: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2224: (pkcs11_init(!options.batch_mode) == 0) &&
2225: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1.514 djm 2226: &keys, &comments)) > 0) {
1.333 markus 2227: for (i = 0; i < nkeys; i++) {
1.335 djm 2228: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2229: sshkey_free(keys[i]);
1.514 djm 2230: free(comments[i]);
1.335 djm 2231: continue;
2232: }
2233: identity_keys[n_ids] = keys[i];
1.514 djm 2234: identity_files[n_ids] = comments[i]; /* transferred */
1.335 djm 2235: n_ids++;
1.167 markus 2236: }
1.378 djm 2237: free(keys);
1.514 djm 2238: free(comments);
1.127 markus 2239: }
1.333 markus 2240: #endif /* ENABLE_PKCS11 */
1.335 djm 2241: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2242: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2243: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2244: free(options.identity_files[i]);
1.426 djm 2245: options.identity_files[i] = NULL;
1.335 djm 2246: continue;
2247: }
1.490 dtucker 2248: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.544 djm 2249: filename = default_client_percent_dollar_expand(cp, cinfo);
1.378 djm 2250: free(cp);
1.483 markus 2251: check_load(sshkey_load_public(filename, &public, NULL),
2252: filename, "pubkey");
1.131 millert 2253: debug("identity file %s type %d", filename,
2254: public ? public->type : -1);
1.378 djm 2255: free(options.identity_files[i]);
1.335 djm 2256: identity_files[n_ids] = filename;
2257: identity_keys[n_ids] = public;
1.484 djm 2258: identity_file_userprovided[n_ids] =
2259: options.identity_file_userprovided[i];
1.335 djm 2260: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2261: continue;
2262:
1.426 djm 2263: /*
2264: * If no certificates have been explicitly listed then try
2265: * to add the default certificate variant too.
2266: */
2267: if (options.num_certificate_files != 0)
2268: continue;
1.335 djm 2269: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2270: check_load(sshkey_load_public(cp, &public, NULL),
2271: filename, "pubkey");
1.335 djm 2272: debug("identity file %s type %d", cp,
2273: public ? public->type : -1);
2274: if (public == NULL) {
1.378 djm 2275: free(cp);
1.335 djm 2276: continue;
2277: }
1.483 markus 2278: if (!sshkey_is_cert(public)) {
1.540 djm 2279: debug_f("key %s type %s is not a certificate",
2280: cp, sshkey_type(public));
1.483 markus 2281: sshkey_free(public);
1.378 djm 2282: free(cp);
1.335 djm 2283: continue;
2284: }
1.448 djm 2285: /* NB. leave filename pointing to private key */
2286: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2287: identity_keys[n_ids] = public;
1.484 djm 2288: identity_file_userprovided[n_ids] =
2289: options.identity_file_userprovided[i];
1.335 djm 2290: n_ids++;
2291: }
1.426 djm 2292:
2293: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
1.540 djm 2294: fatal_f("too many certificates");
1.426 djm 2295: for (i = 0; i < options.num_certificate_files; i++) {
2296: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2297: getuid());
1.544 djm 2298: filename = default_client_percent_dollar_expand(cp, cinfo);
1.426 djm 2299: free(cp);
2300:
1.483 markus 2301: check_load(sshkey_load_public(filename, &public, NULL),
2302: filename, "certificate");
1.426 djm 2303: debug("certificate file %s type %d", filename,
2304: public ? public->type : -1);
2305: free(options.certificate_files[i]);
2306: options.certificate_files[i] = NULL;
2307: if (public == NULL) {
2308: free(filename);
2309: continue;
2310: }
1.483 markus 2311: if (!sshkey_is_cert(public)) {
1.540 djm 2312: debug_f("key %s type %s is not a certificate",
2313: filename, sshkey_type(public));
1.483 markus 2314: sshkey_free(public);
1.426 djm 2315: free(filename);
2316: continue;
2317: }
2318: certificate_files[n_certs] = filename;
2319: certificates[n_certs] = public;
1.484 djm 2320: certificate_file_userprovided[n_certs] =
2321: options.certificate_file_userprovided[i];
1.426 djm 2322: ++n_certs;
2323: }
2324:
1.335 djm 2325: options.num_identity_files = n_ids;
2326: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2327: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2328: memcpy(options.identity_file_userprovided,
2329: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2330:
2331: options.num_certificate_files = n_certs;
2332: memcpy(options.certificate_files,
2333: certificate_files, sizeof(certificate_files));
2334: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2335: memcpy(options.certificate_file_userprovided,
2336: certificate_file_userprovided,
2337: sizeof(certificate_file_userprovided));
1.214 djm 2338: }
1.352 djm 2339:
2340: static void
2341: main_sigchld_handler(int sig)
2342: {
2343: int save_errno = errno;
2344: pid_t pid;
2345: int status;
2346:
2347: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2348: (pid == -1 && errno == EINTR))
1.352 djm 2349: ;
2350: errno = save_errno;
2351: }
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