Annotation of src/usr.bin/ssh/ssh.c, Revision 1.561
1.561 ! djm 1: /* $OpenBSD: ssh.c,v 1.560 2021/07/13 23:48:36 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: /*
114: * Flag indicating that nothing should be read from stdin. This can be set
115: * on the command line.
116: */
1.1 deraadt 117: int stdin_null_flag = 0;
118:
1.33 markus 119: /*
1.344 djm 120: * Flag indicating that the current process should be backgrounded and
1.531 djm 121: * a new mux-client launched in the foreground for ControlPersist.
1.344 djm 122: */
123: int need_controlpersist_detach = 0;
124:
1.531 djm 125: /* Copies of flags for ControlPersist foreground mux-client */
1.560 djm 126: int ostdin_null_flag, osession_type, otty_flag, orequest_tty;
1.344 djm 127:
128: /*
1.33 markus 129: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 130: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 131: * background.
132: */
1.1 deraadt 133: int fork_after_authentication_flag = 0;
134:
1.33 markus 135: /*
136: * General data structure for command line options and options configurable
137: * in configuration files. See readconf.h.
138: */
1.1 deraadt 139: Options options;
140:
1.139 markus 141: /* optional user configfile */
142: char *config = NULL;
143:
1.33 markus 144: /*
145: * Name of the host we are connecting to. This is the name given on the
1.503 jmc 146: * command line, or the Hostname specified for the user-supplied name in a
1.33 markus 147: * configuration file.
148: */
1.1 deraadt 149: char *host;
150:
1.510 djm 151: /*
152: * A config can specify a path to forward, overriding SSH_AUTH_SOCK. If this is
153: * not NULL, forward the socket at this path instead.
154: */
155: char *forward_agent_sock_path = NULL;
156:
1.22 provos 157: /* socket address the host resolves to */
1.37 markus 158: struct sockaddr_storage hostaddr;
1.1 deraadt 159:
1.112 markus 160: /* Private host keys. */
1.173 markus 161: Sensitive sensitive_data;
1.1 deraadt 162:
1.45 markus 163: /* command to be executed */
1.482 markus 164: struct sshbuf *command;
1.45 markus 165:
1.170 markus 166: /* # of replies received for global requests */
1.523 djm 167: static int forward_confirms_pending = -1;
1.170 markus 168:
1.313 djm 169: /* mux.c */
170: extern int muxserver_sock;
171: extern u_int muxclient_command;
172:
1.1 deraadt 173: /* Prints a help message to the user. This function never returns. */
174:
1.126 itojun 175: static void
1.93 itojun 176: usage(void)
1.1 deraadt 177: {
1.208 markus 178: fprintf(stderr,
1.474 djm 179: "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n"
180: " [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n"
181: " [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n"
182: " [-i identity_file] [-J [user@]host[:port]] [-L address]\n"
183: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
184: " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
185: " [-w local_tun[:remote_tun]] destination [command]\n"
1.208 markus 186: );
1.257 dtucker 187: exit(255);
1.1 deraadt 188: }
189:
1.544 djm 190: static int ssh_session2(struct ssh *, const struct ssh_conn_info *);
191: static void load_public_identity_files(const struct ssh_conn_info *);
1.352 djm 192: static void main_sigchld_handler(int);
1.312 djm 193:
1.361 djm 194: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
195: static void
196: tilde_expand_paths(char **paths, u_int num_paths)
197: {
198: u_int i;
199: char *cp;
200:
201: for (i = 0; i < num_paths; i++) {
1.490 dtucker 202: cp = tilde_expand_filename(paths[i], getuid());
1.378 djm 203: free(paths[i]);
1.361 djm 204: paths[i] = cp;
205: }
206: }
207:
1.527 dtucker 208: /*
209: * Expands the set of percent_expand options used by the majority of keywords
210: * in the client that support percent expansion.
211: * Caller must free returned string.
212: */
213: static char *
1.544 djm 214: default_client_percent_expand(const char *str,
215: const struct ssh_conn_info *cinfo)
1.527 dtucker 216: {
217: return percent_expand(str,
1.546 djm 218: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.527 dtucker 219: (char *)NULL);
220: }
221:
1.400 djm 222: /*
1.528 dtucker 223: * Expands the set of percent_expand options used by the majority of keywords
224: * AND perform environment variable substitution.
225: * Caller must free returned string.
226: */
227: static char *
1.544 djm 228: default_client_percent_dollar_expand(const char *str,
229: const struct ssh_conn_info *cinfo)
1.528 dtucker 230: {
231: char *ret;
232:
233: ret = percent_dollar_expand(str,
1.546 djm 234: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.528 dtucker 235: (char *)NULL);
236: if (ret == NULL)
237: fatal("invalid environment variable expansion");
238: return ret;
239: }
240:
241: /*
1.400 djm 242: * Attempt to resolve a host name / port to a set of addresses and
243: * optionally return any CNAMEs encountered along the way.
244: * Returns NULL on failure.
245: * NB. this function must operate with a options having undefined members.
246: */
1.385 djm 247: static struct addrinfo *
1.400 djm 248: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 249: {
250: char strport[NI_MAXSERV];
251: struct addrinfo hints, *res;
1.501 dtucker 252: int gaierr;
253: LogLevel loglevel = SYSLOG_LEVEL_DEBUG1;
1.385 djm 254:
1.400 djm 255: if (port <= 0)
256: port = default_ssh_port();
1.521 markus 257: if (cname != NULL)
258: *cname = '\0';
1.400 djm 259:
1.427 djm 260: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 261: memset(&hints, 0, sizeof(hints));
1.400 djm 262: hints.ai_family = options.address_family == -1 ?
263: AF_UNSPEC : options.address_family;
1.385 djm 264: hints.ai_socktype = SOCK_STREAM;
265: if (cname != NULL)
266: hints.ai_flags = AI_CANONNAME;
267: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
268: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
269: loglevel = SYSLOG_LEVEL_ERROR;
270: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
271: __progname, name, ssh_gai_strerror(gaierr));
272: return NULL;
273: }
274: if (cname != NULL && res->ai_canonname != NULL) {
275: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
1.540 djm 276: error_f("host \"%s\" cname \"%s\" too long (max %lu)",
277: name, res->ai_canonname, (u_long)clen);
1.385 djm 278: if (clen > 0)
279: *cname = '\0';
280: }
281: }
282: return res;
283: }
284:
1.470 djm 285: /* Returns non-zero if name can only be an address and not a hostname */
286: static int
287: is_addr_fast(const char *name)
288: {
289: return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
290: strspn(name, "0123456789.") == strlen(name));
291: }
292:
293: /* Returns non-zero if name represents a valid, single address */
294: static int
295: is_addr(const char *name)
296: {
297: char strport[NI_MAXSERV];
298: struct addrinfo hints, *res;
299:
300: if (is_addr_fast(name))
301: return 1;
302:
303: snprintf(strport, sizeof strport, "%u", default_ssh_port());
304: memset(&hints, 0, sizeof(hints));
305: hints.ai_family = options.address_family == -1 ?
306: AF_UNSPEC : options.address_family;
307: hints.ai_socktype = SOCK_STREAM;
308: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
309: if (getaddrinfo(name, strport, &hints, &res) != 0)
310: return 0;
311: if (res == NULL || res->ai_next != NULL) {
312: freeaddrinfo(res);
313: return 0;
314: }
315: freeaddrinfo(res);
316: return 1;
317: }
318:
1.385 djm 319: /*
1.413 djm 320: * Attempt to resolve a numeric host address / port to a single address.
321: * Returns a canonical address string.
322: * Returns NULL on failure.
323: * NB. this function must operate with a options having undefined members.
324: */
325: static struct addrinfo *
326: resolve_addr(const char *name, int port, char *caddr, size_t clen)
327: {
328: char addr[NI_MAXHOST], strport[NI_MAXSERV];
329: struct addrinfo hints, *res;
330: int gaierr;
331:
332: if (port <= 0)
333: port = default_ssh_port();
334: snprintf(strport, sizeof strport, "%u", port);
335: memset(&hints, 0, sizeof(hints));
336: hints.ai_family = options.address_family == -1 ?
337: AF_UNSPEC : options.address_family;
338: hints.ai_socktype = SOCK_STREAM;
339: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
340: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
1.540 djm 341: debug2_f("could not resolve name %.100s as address: %s",
342: name, ssh_gai_strerror(gaierr));
1.413 djm 343: return NULL;
344: }
345: if (res == NULL) {
1.540 djm 346: debug_f("getaddrinfo %.100s returned no addresses", name);
1.413 djm 347: return NULL;
348: }
349: if (res->ai_next != NULL) {
1.540 djm 350: debug_f("getaddrinfo %.100s returned multiple addresses", name);
1.413 djm 351: goto fail;
352: }
353: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
354: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
1.540 djm 355: debug_f("Could not format address for name %.100s: %s",
356: name, ssh_gai_strerror(gaierr));
1.413 djm 357: goto fail;
358: }
359: if (strlcpy(caddr, addr, clen) >= clen) {
1.540 djm 360: error_f("host \"%s\" addr \"%s\" too long (max %lu)",
361: name, addr, (u_long)clen);
1.413 djm 362: if (clen > 0)
363: *caddr = '\0';
364: fail:
365: freeaddrinfo(res);
366: return NULL;
367: }
368: return res;
369: }
370:
371: /*
1.385 djm 372: * Check whether the cname is a permitted replacement for the hostname
373: * and perform the replacement if it is.
1.400 djm 374: * NB. this function must operate with a options having undefined members.
1.385 djm 375: */
376: static int
1.443 djm 377: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 378: {
379: int i;
380: struct allowed_cname *rule;
381:
382: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
383: strcmp(*namep, cname) == 0)
384: return 0;
1.386 djm 385: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 386: return 0;
387: /*
1.386 djm 388: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 389: * a proxy or jump host unless the user specifically requests so.
1.385 djm 390: */
1.443 djm 391: if (!direct &&
1.386 djm 392: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 393: return 0;
1.540 djm 394: debug3_f("check \"%s\" CNAME \"%s\"", *namep, cname);
1.385 djm 395: for (i = 0; i < options.num_permitted_cnames; i++) {
396: rule = options.permitted_cnames + i;
1.418 djm 397: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
398: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 399: continue;
1.386 djm 400: verbose("Canonicalized DNS aliased hostname "
1.385 djm 401: "\"%s\" => \"%s\"", *namep, cname);
402: free(*namep);
403: *namep = xstrdup(cname);
404: return 1;
405: }
406: return 0;
407: }
408:
409: /*
410: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 411: * canonicalization rules. Returns the address list for the host or NULL
412: * if no name was found after canonicalization.
1.400 djm 413: * NB. this function must operate with a options having undefined members.
1.385 djm 414: */
415: static struct addrinfo *
1.400 djm 416: resolve_canonicalize(char **hostp, int port)
1.385 djm 417: {
1.443 djm 418: int i, direct, ndots;
1.413 djm 419: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 420: struct addrinfo *addrs;
421:
422: /*
1.470 djm 423: * Attempt to canonicalise addresses, regardless of
424: * whether hostname canonicalisation was requested
1.385 djm 425: */
1.413 djm 426: if ((addrs = resolve_addr(*hostp, port,
427: newname, sizeof(newname))) != NULL) {
1.540 djm 428: debug2_f("hostname %.100s is address", *hostp);
1.413 djm 429: if (strcasecmp(*hostp, newname) != 0) {
1.540 djm 430: debug2_f("canonicalised address \"%s\" => \"%s\"",
431: *hostp, newname);
1.413 djm 432: free(*hostp);
433: *hostp = xstrdup(newname);
434: }
435: return addrs;
436: }
437:
1.470 djm 438: /*
439: * If this looks like an address but didn't parse as one, it might
440: * be an address with an invalid interface scope. Skip further
441: * attempts at canonicalisation.
442: */
443: if (is_addr_fast(*hostp)) {
1.540 djm 444: debug_f("hostname %.100s is an unrecognised address", *hostp);
1.470 djm 445: return NULL;
446: }
447:
448: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
449: return NULL;
450:
451: /*
452: * Don't attempt to canonicalize names that will be interpreted by
453: * a proxy unless the user specifically requests so.
454: */
455: direct = option_clear_or_none(options.proxy_command) &&
456: options.jump_host == NULL;
457: if (!direct &&
458: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
459: return NULL;
460:
1.428 djm 461: /* If domain name is anchored, then resolve it now */
462: if ((*hostp)[strlen(*hostp) - 1] == '.') {
1.540 djm 463: debug3_f("name is fully qualified");
1.428 djm 464: fullhost = xstrdup(*hostp);
465: if ((addrs = resolve_host(fullhost, port, 0,
466: newname, sizeof(newname))) != NULL)
467: goto found;
468: free(fullhost);
469: goto notfound;
470: }
471:
1.387 djm 472: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 473: ndots = 0;
474: for (cp = *hostp; *cp != '\0'; cp++) {
475: if (*cp == '.')
476: ndots++;
477: }
1.386 djm 478: if (ndots > options.canonicalize_max_dots) {
1.540 djm 479: debug3_f("not canonicalizing hostname \"%s\" (max dots %d)",
480: *hostp, options.canonicalize_max_dots);
1.385 djm 481: return NULL;
482: }
483: /* Attempt each supplied suffix */
484: for (i = 0; i < options.num_canonical_domains; i++) {
1.559 djm 485: if (strcasecmp(options.canonical_domains[i], "none") == 0)
486: break;
1.385 djm 487: xasprintf(&fullhost, "%s.%s.", *hostp,
488: options.canonical_domains[i]);
1.540 djm 489: debug3_f("attempting \"%s\" => \"%s\"", *hostp, fullhost);
1.400 djm 490: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 491: newname, sizeof(newname))) == NULL) {
1.385 djm 492: free(fullhost);
493: continue;
494: }
1.428 djm 495: found:
1.385 djm 496: /* Remove trailing '.' */
497: fullhost[strlen(fullhost) - 1] = '\0';
498: /* Follow CNAME if requested */
1.443 djm 499: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 500: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 501: *hostp, fullhost);
502: }
503: free(*hostp);
504: *hostp = fullhost;
505: return addrs;
506: }
1.428 djm 507: notfound:
1.386 djm 508: if (!options.canonicalize_fallback_local)
1.400 djm 509: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
1.540 djm 510: debug2_f("host %s not found in any suffix", *hostp);
1.385 djm 511: return NULL;
512: }
513:
1.32 deraadt 514: /*
1.483 markus 515: * Check the result of hostkey loading, ignoring some errors and
516: * fatal()ing for others.
517: */
518: static void
519: check_load(int r, const char *path, const char *message)
520: {
521: switch (r) {
522: case 0:
523: break;
524: case SSH_ERR_INTERNAL_ERROR:
525: case SSH_ERR_ALLOC_FAIL:
1.540 djm 526: fatal_r(r, "load %s \"%s\"", message, path);
1.483 markus 527: case SSH_ERR_SYSTEM_ERROR:
528: /* Ignore missing files */
529: if (errno == ENOENT)
530: break;
531: /* FALLTHROUGH */
532: default:
1.540 djm 533: error_r(r, "load %s \"%s\"", message, path);
1.483 markus 534: break;
535: }
536: }
537:
538: /*
1.400 djm 539: * Read per-user configuration file. Ignore the system wide config
540: * file if the user specifies a config file on the command line.
541: */
542: static void
1.496 djm 543: process_config_files(const char *host_name, struct passwd *pw, int final_pass,
544: int *want_final_pass)
1.400 djm 545: {
1.414 deraadt 546: char buf[PATH_MAX];
1.400 djm 547: int r;
548:
549: if (config != NULL) {
550: if (strcasecmp(config, "none") != 0 &&
1.466 djm 551: !read_config_file(config, pw, host, host_name, &options,
1.496 djm 552: SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0),
553: want_final_pass))
1.400 djm 554: fatal("Can't open user config file %.100s: "
555: "%.100s", config, strerror(errno));
556: } else {
557: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
558: _PATH_SSH_USER_CONFFILE);
559: if (r > 0 && (size_t)r < sizeof(buf))
1.466 djm 560: (void)read_config_file(buf, pw, host, host_name,
1.408 djm 561: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
1.496 djm 562: (final_pass ? SSHCONF_FINAL : 0), want_final_pass);
1.400 djm 563:
564: /* Read systemwide configuration file after user config. */
1.408 djm 565: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
1.466 djm 566: host, host_name, &options,
1.496 djm 567: final_pass ? SSHCONF_FINAL : 0, want_final_pass);
1.408 djm 568: }
569: }
570:
571: /* Rewrite the port number in an addrinfo list of addresses */
572: static void
573: set_addrinfo_port(struct addrinfo *addrs, int port)
574: {
575: struct addrinfo *addr;
576:
577: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
578: switch (addr->ai_family) {
579: case AF_INET:
580: ((struct sockaddr_in *)addr->ai_addr)->
581: sin_port = htons(port);
582: break;
583: case AF_INET6:
584: ((struct sockaddr_in6 *)addr->ai_addr)->
585: sin6_port = htons(port);
586: break;
587: }
1.400 djm 588: }
589: }
590:
1.544 djm 591: static void
592: ssh_conn_info_free(struct ssh_conn_info *cinfo)
593: {
594: if (cinfo == NULL)
595: return;
596: free(cinfo->conn_hash_hex);
597: free(cinfo->shorthost);
598: free(cinfo->uidstr);
599: free(cinfo->keyalias);
600: free(cinfo->thishost);
601: free(cinfo->host_arg);
602: free(cinfo->portstr);
603: free(cinfo->remhost);
604: free(cinfo->remuser);
605: free(cinfo->homedir);
606: free(cinfo->locuser);
607: free(cinfo);
608: }
609:
1.400 djm 610: /*
1.32 deraadt 611: * Main program for the ssh client.
612: */
1.2 provos 613: int
614: main(int ac, char **av)
1.1 deraadt 615: {
1.437 djm 616: struct ssh *ssh = NULL;
1.462 djm 617: int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
1.496 djm 618: int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
1.544 djm 619: char *p, *cp, *line, *argv0, *logfile, *host_arg;
620: char cname[NI_MAXHOST], thishost[NI_MAXHOST];
1.31 markus 621: struct stat st;
1.98 markus 622: struct passwd *pw;
1.144 stevesk 623: extern int optind, optreset;
624: extern char *optarg;
1.406 millert 625: struct Forward fwd;
1.385 djm 626: struct addrinfo *addrs = NULL;
1.513 dtucker 627: size_t n, len;
1.532 dtucker 628: u_int j;
1.544 djm 629: struct ssh_conn_info *cinfo = NULL;
1.250 djm 630:
631: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
632: sanitise_stdfd();
1.31 markus 633:
1.33 markus 634: /*
1.346 djm 635: * Discard other fds that are hanging around. These can cause problem
636: * with backgrounded ssh processes started by ControlPersist.
637: */
638: closefrom(STDERR_FILENO + 1);
639:
1.487 dtucker 640: if (getuid() != geteuid())
641: fatal("ssh setuid not supported.");
642: if (getgid() != getegid())
643: fatal("ssh setgid not supported.");
1.184 stevesk 644:
1.107 markus 645: /* Get user data. */
1.490 dtucker 646: pw = getpwuid(getuid());
1.107 markus 647: if (!pw) {
1.490 dtucker 648: logit("No user exists for uid %lu", (u_long)getuid());
1.257 dtucker 649: exit(255);
1.107 markus 650: }
651: /* Take a copy of the returned structure. */
652: pw = pwcopy(pw);
1.31 markus 653:
1.33 markus 654: /*
655: * Set our umask to something reasonable, as some files are created
656: * with the default umask. This will make them world-readable but
657: * writable only by the owner, which is ok for all files for which we
658: * don't set the modes explicitly.
659: */
1.31 markus 660: umask(022);
1.445 djm 661:
662: setlocale(LC_CTYPE, "");
1.31 markus 663:
1.316 djm 664: /*
665: * Initialize option structure to indicate that no values have been
666: * set.
667: */
1.31 markus 668: initialize_options(&options);
669:
1.463 djm 670: /*
671: * Prepare main ssh transport/connection structures
672: */
673: if ((ssh = ssh_alloc_session_state()) == NULL)
674: fatal("Couldn't allocate session state");
675: channel_init_channels(ssh);
676:
1.31 markus 677: /* Parse command-line arguments. */
678: host = NULL;
1.320 djm 679: use_syslog = 0;
1.375 dtucker 680: logfile = NULL;
1.325 markus 681: argv0 = av[0];
1.31 markus 682:
1.266 djm 683: again:
1.316 djm 684: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.474 djm 685: "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 686: switch (opt) {
1.91 jakob 687: case '1':
1.454 djm 688: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 689: break;
1.47 markus 690: case '2':
1.454 djm 691: /* Ignored */
1.47 markus 692: break;
1.37 markus 693: case '4':
1.196 djm 694: options.address_family = AF_INET;
1.37 markus 695: break;
696: case '6':
1.196 djm 697: options.address_family = AF_INET6;
1.37 markus 698: break;
1.31 markus 699: case 'n':
700: stdin_null_flag = 1;
701: break;
702: case 'f':
703: fork_after_authentication_flag = 1;
704: stdin_null_flag = 1;
705: break;
706: case 'x':
707: options.forward_x11 = 0;
708: break;
709: case 'X':
710: options.forward_x11 = 1;
711: break;
1.320 djm 712: case 'y':
713: use_syslog = 1;
714: break;
1.375 dtucker 715: case 'E':
1.422 dtucker 716: logfile = optarg;
1.375 dtucker 717: break;
1.408 djm 718: case 'G':
719: config_test = 1;
720: break;
1.202 markus 721: case 'Y':
722: options.forward_x11 = 1;
723: options.forward_x11_trusted = 1;
724: break;
1.31 markus 725: case 'g':
1.406 millert 726: options.fwd_opts.gateway_ports = 1;
1.31 markus 727: break;
1.229 djm 728: case 'O':
1.441 dtucker 729: if (options.stdio_forward_host != NULL)
1.332 djm 730: fatal("Cannot specify multiplexing "
731: "command with -W");
732: else if (muxclient_command != 0)
733: fatal("Multiplexing command already specified");
1.229 djm 734: if (strcmp(optarg, "check") == 0)
1.312 djm 735: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 736: else if (strcmp(optarg, "forward") == 0)
737: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 738: else if (strcmp(optarg, "exit") == 0)
1.312 djm 739: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 740: else if (strcmp(optarg, "stop") == 0)
741: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 742: else if (strcmp(optarg, "cancel") == 0)
743: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 744: else if (strcmp(optarg, "proxy") == 0)
745: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 746: else
747: fatal("Invalid multiplex command.");
748: break;
1.183 stevesk 749: case 'P': /* deprecated */
1.376 djm 750: break;
1.394 deraadt 751: case 'Q':
1.376 djm 752: cp = NULL;
1.519 dtucker 753: if (strcmp(optarg, "cipher") == 0 ||
754: strcasecmp(optarg, "Ciphers") == 0)
1.393 djm 755: cp = cipher_alg_list('\n', 0);
1.394 deraadt 756: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 757: cp = cipher_alg_list('\n', 1);
1.519 dtucker 758: else if (strcmp(optarg, "mac") == 0 ||
759: strcasecmp(optarg, "MACs") == 0)
1.392 dtucker 760: cp = mac_alg_list('\n');
1.519 dtucker 761: else if (strcmp(optarg, "kex") == 0 ||
762: strcasecmp(optarg, "KexAlgorithms") == 0)
1.392 dtucker 763: cp = kex_alg_list('\n');
1.394 deraadt 764: else if (strcmp(optarg, "key") == 0)
1.451 djm 765: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 766: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 767: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 768: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 769: cp = sshkey_alg_list(0, 1, 0, '\n');
1.519 dtucker 770: else if (strcmp(optarg, "key-sig") == 0 ||
1.547 dtucker 771: strcasecmp(optarg, "PubkeyAcceptedKeyTypes") == 0 || /* deprecated name */
772: strcasecmp(optarg, "PubkeyAcceptedAlgorithms") == 0 ||
1.519 dtucker 773: strcasecmp(optarg, "HostKeyAlgorithms") == 0 ||
1.548 dtucker 774: strcasecmp(optarg, "HostbasedKeyTypes") == 0 || /* deprecated name */
775: strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 0 || /* deprecated name */
776: strcasecmp(optarg, "HostbasedAcceptedAlgorithms") == 0)
1.519 dtucker 777: cp = sshkey_alg_list(0, 0, 1, '\n');
1.491 djm 778: else if (strcmp(optarg, "sig") == 0)
1.492 djm 779: cp = sshkey_alg_list(0, 1, 1, '\n');
1.491 djm 780: else if (strcmp(optarg, "protocol-version") == 0)
1.416 djm 781: cp = xstrdup("2");
1.513 dtucker 782: else if (strcmp(optarg, "compression") == 0) {
783: cp = xstrdup(compression_alg_list(0));
784: len = strlen(cp);
785: for (n = 0; n < len; n++)
786: if (cp[n] == ',')
787: cp[n] = '\n';
788: } else if (strcmp(optarg, "help") == 0) {
1.491 djm 789: cp = xstrdup(
1.513 dtucker 790: "cipher\ncipher-auth\ncompression\nkex\n"
1.519 dtucker 791: "key\nkey-cert\nkey-plain\nkey-sig\nmac\n"
1.491 djm 792: "protocol-version\nsig");
1.416 djm 793: }
1.376 djm 794: if (cp == NULL)
795: fatal("Unsupported query \"%s\"", optarg);
796: printf("%s\n", cp);
797: free(cp);
798: exit(0);
1.31 markus 799: break;
800: case 'a':
801: options.forward_agent = 0;
1.53 markus 802: break;
803: case 'A':
804: options.forward_agent = 1;
1.31 markus 805: break;
806: case 'k':
1.204 dtucker 807: options.gss_deleg_creds = 0;
1.297 djm 808: break;
809: case 'K':
810: options.gss_authentication = 1;
811: options.gss_deleg_creds = 1;
1.31 markus 812: break;
813: case 'i':
1.490 dtucker 814: p = tilde_expand_filename(optarg, getuid());
1.505 deraadt 815: if (stat(p, &st) == -1)
1.128 fgsch 816: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 817: "not accessible: %s.\n", p,
1.231 otto 818: strerror(errno));
1.429 dtucker 819: else
820: add_identity_file(&options, NULL, p, 1);
821: free(p);
1.31 markus 822: break;
1.127 markus 823: case 'I':
1.333 markus 824: #ifdef ENABLE_PKCS11
1.422 dtucker 825: free(options.pkcs11_provider);
1.333 markus 826: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 827: #else
1.333 markus 828: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 829: #endif
1.127 markus 830: break;
1.443 djm 831: case 'J':
1.504 djm 832: if (options.jump_host != NULL) {
833: fatal("Only a single -J option is permitted "
834: "(use commas to separate multiple "
835: "jump hops)");
836: }
1.443 djm 837: if (options.proxy_command != NULL)
838: fatal("Cannot specify -J with ProxyCommand");
839: if (parse_jump(optarg, &options, 1) == -1)
840: fatal("Invalid -J argument");
841: options.proxy_command = xstrdup("none");
842: break;
1.31 markus 843: case 't':
1.359 djm 844: if (options.request_tty == REQUEST_TTY_YES)
845: options.request_tty = REQUEST_TTY_FORCE;
846: else
847: options.request_tty = REQUEST_TTY_YES;
1.31 markus 848: break;
849: case 'v':
1.197 markus 850: if (debug_flag == 0) {
1.66 markus 851: debug_flag = 1;
852: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 853: } else {
1.443 djm 854: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
855: debug_flag++;
1.197 markus 856: options.log_level++;
1.443 djm 857: }
1.197 markus 858: }
1.375 dtucker 859: break;
1.31 markus 860: case 'V':
1.209 markus 861: fprintf(stderr, "%s, %s\n",
1.541 dtucker 862: SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 863: if (opt == 'V')
864: exit(0);
865: break;
1.255 reyk 866: case 'w':
1.256 reyk 867: if (options.tun_open == -1)
868: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 869: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 870: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 871: fprintf(stderr,
872: "Bad tun device '%s'\n", optarg);
1.257 dtucker 873: exit(255);
1.255 reyk 874: }
875: break;
1.331 dtucker 876: case 'W':
1.441 dtucker 877: if (options.stdio_forward_host != NULL)
1.332 djm 878: fatal("stdio forward already specified");
879: if (muxclient_command != 0)
880: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 881: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 882: options.stdio_forward_host = fwd.listen_host;
883: options.stdio_forward_port = fwd.listen_port;
1.378 djm 884: free(fwd.connect_host);
1.331 dtucker 885: } else {
886: fprintf(stderr,
887: "Bad stdio forwarding specification '%s'\n",
888: optarg);
889: exit(255);
890: }
1.359 djm 891: options.request_tty = REQUEST_TTY_NO;
1.560 djm 892: options.session_type = SESSION_TYPE_NONE;
1.331 dtucker 893: break;
1.31 markus 894: case 'q':
895: options.log_level = SYSLOG_LEVEL_QUIET;
896: break;
897: case 'e':
898: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 899: (u_char) optarg[1] >= 64 &&
900: (u_char) optarg[1] < 128)
1.78 markus 901: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 902: else if (strlen(optarg) == 1)
1.78 markus 903: options.escape_char = (u_char) optarg[0];
1.31 markus 904: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 905: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 906: else {
1.128 fgsch 907: fprintf(stderr, "Bad escape character '%s'.\n",
908: optarg);
1.257 dtucker 909: exit(255);
1.31 markus 910: }
911: break;
912: case 'c':
1.506 naddy 913: if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
1.420 djm 914: optarg + 1 : optarg)) {
915: fprintf(stderr, "Unknown cipher type '%s'\n",
916: optarg);
917: exit(255);
1.95 markus 918: }
1.456 djm 919: free(options.ciphers);
920: options.ciphers = xstrdup(optarg);
1.95 markus 921: break;
922: case 'm':
1.422 dtucker 923: if (mac_valid(optarg)) {
924: free(options.macs);
1.95 markus 925: options.macs = xstrdup(optarg);
1.422 dtucker 926: } else {
1.128 fgsch 927: fprintf(stderr, "Unknown mac type '%s'\n",
928: optarg);
1.257 dtucker 929: exit(255);
1.31 markus 930: }
931: break;
1.214 djm 932: case 'M':
1.242 djm 933: if (options.control_master == SSHCTL_MASTER_YES)
934: options.control_master = SSHCTL_MASTER_ASK;
935: else
936: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 937: break;
1.31 markus 938: case 'p':
1.465 millert 939: if (options.port == -1) {
940: options.port = a2port(optarg);
941: if (options.port <= 0) {
942: fprintf(stderr, "Bad port '%s'\n",
943: optarg);
944: exit(255);
945: }
1.109 markus 946: }
1.31 markus 947: break;
948: case 'l':
1.465 millert 949: if (options.user == NULL)
950: options.user = optarg;
1.31 markus 951: break;
1.141 stevesk 952:
953: case 'L':
1.324 djm 954: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 955: add_local_forward(&options, &fwd);
956: else {
1.128 fgsch 957: fprintf(stderr,
1.232 djm 958: "Bad local forwarding specification '%s'\n",
1.128 fgsch 959: optarg);
1.257 dtucker 960: exit(255);
1.31 markus 961: }
1.232 djm 962: break;
963:
964: case 'R':
1.464 markus 965: if (parse_forward(&fwd, optarg, 0, 1) ||
966: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 967: add_remote_forward(&options, &fwd);
968: } else {
1.128 fgsch 969: fprintf(stderr,
1.232 djm 970: "Bad remote forwarding specification "
971: "'%s'\n", optarg);
1.257 dtucker 972: exit(255);
1.31 markus 973: }
974: break;
1.108 markus 975:
976: case 'D':
1.324 djm 977: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 978: add_local_forward(&options, &fwd);
1.232 djm 979: } else {
1.322 stevesk 980: fprintf(stderr,
981: "Bad dynamic forwarding specification "
982: "'%s'\n", optarg);
1.257 dtucker 983: exit(255);
1.109 markus 984: }
1.108 markus 985: break;
986:
1.31 markus 987: case 'C':
1.513 dtucker 988: #ifdef WITH_ZLIB
1.31 markus 989: options.compression = 1;
1.513 dtucker 990: #else
991: error("Compression not supported, disabling.");
992: #endif
1.31 markus 993: break;
1.45 markus 994: case 'N':
1.560 djm 995: if (options.session_type != -1 &&
996: options.session_type != SESSION_TYPE_NONE)
997: fatal("Cannot specify -N with -s/SessionType");
998: options.session_type = SESSION_TYPE_NONE;
1.359 djm 999: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1000: break;
1001: case 'T':
1.359 djm 1002: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1003: break;
1.31 markus 1004: case 'o':
1.205 markus 1005: line = xstrdup(optarg);
1.408 djm 1006: if (process_config_line(&options, pw,
1007: host ? host : "", host ? host : "", line,
1008: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 1009: exit(255);
1.378 djm 1010: free(line);
1.31 markus 1011: break;
1.85 djm 1012: case 's':
1.560 djm 1013: if (options.session_type != -1 &&
1014: options.session_type != SESSION_TYPE_SUBSYSTEM)
1015: fatal("Cannot specify -s with -N/SessionType");
1016: options.session_type = SESSION_TYPE_SUBSYSTEM;
1.117 markus 1017: break;
1.214 djm 1018: case 'S':
1.431 mmcc 1019: free(options.control_path);
1.214 djm 1020: options.control_path = xstrdup(optarg);
1021: break;
1.117 markus 1022: case 'b':
1023: options.bind_address = optarg;
1.474 djm 1024: break;
1025: case 'B':
1026: options.bind_interface = optarg;
1.85 djm 1027: break;
1.139 markus 1028: case 'F':
1029: config = optarg;
1030: break;
1.31 markus 1031: default:
1032: usage();
1.1 deraadt 1033: }
1.31 markus 1034: }
1035:
1.462 djm 1036: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
1037: opt_terminated = 1;
1038:
1.128 fgsch 1039: ac -= optind;
1040: av += optind;
1041:
1.329 guenther 1042: if (ac > 0 && !host) {
1.465 millert 1043: int tport;
1044: char *tuser;
1045: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
1046: case -1:
1047: usage();
1048: break;
1049: case 0:
1050: if (options.user == NULL) {
1051: options.user = tuser;
1052: tuser = NULL;
1053: }
1054: free(tuser);
1055: if (options.port == -1 && tport != -1)
1056: options.port = tport;
1057: break;
1058: default:
1.128 fgsch 1059: p = xstrdup(*av);
1.188 markus 1060: cp = strrchr(p, '@');
1.465 millert 1061: if (cp != NULL) {
1062: if (cp == p)
1063: usage();
1064: if (options.user == NULL) {
1065: options.user = p;
1066: p = NULL;
1067: }
1068: *cp++ = '\0';
1069: host = xstrdup(cp);
1070: free(p);
1071: } else
1072: host = p;
1073: break;
1074: }
1.462 djm 1075: if (ac > 1 && !opt_terminated) {
1.189 millert 1076: optind = optreset = 1;
1.128 fgsch 1077: goto again;
1078: }
1.189 millert 1079: ac--, av++;
1.128 fgsch 1080: }
1081:
1.31 markus 1082: /* Check that we got a host name. */
1083: if (!host)
1084: usage();
1085:
1.385 djm 1086: host_arg = xstrdup(host);
1087:
1.402 markus 1088: #ifdef WITH_OPENSSL
1.350 djm 1089: OpenSSL_add_all_algorithms();
1.72 markus 1090: ERR_load_crypto_strings();
1.402 markus 1091: #endif
1.31 markus 1092:
1093: /* Initialize the command to execute on remote host. */
1.482 markus 1094: if ((command = sshbuf_new()) == NULL)
1095: fatal("sshbuf_new failed");
1.1 deraadt 1096:
1.33 markus 1097: /*
1098: * Save the command to execute on the remote host in a buffer. There
1099: * is no limit on the length of the command, except by the maximum
1100: * packet size. Also sets the tty flag if there is no command.
1101: */
1.128 fgsch 1102: if (!ac) {
1.31 markus 1103: /* No command specified - execute shell on a tty. */
1.560 djm 1104: if (options.session_type == SESSION_TYPE_SUBSYSTEM) {
1.128 fgsch 1105: fprintf(stderr,
1106: "You must specify a subsystem to invoke.\n");
1.85 djm 1107: usage();
1108: }
1.31 markus 1109: } else {
1.128 fgsch 1110: /* A command has been specified. Store it into the buffer. */
1111: for (i = 0; i < ac; i++) {
1.482 markus 1112: if ((r = sshbuf_putf(command, "%s%s",
1113: i ? " " : "", av[i])) != 0)
1.540 djm 1114: fatal_fr(r, "buffer error");
1.31 markus 1115: }
1116: }
1117:
1.101 markus 1118: /*
1119: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1120: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1121: */
1.375 dtucker 1122: if (use_syslog && logfile != NULL)
1123: fatal("Can't specify both -y and -E");
1.422 dtucker 1124: if (logfile != NULL)
1.375 dtucker 1125: log_redirect_stderr_to(logfile);
1.325 markus 1126: log_init(argv0,
1.468 djm 1127: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1128: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1129: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1130: SYSLOG_FACILITY_USER : options.log_facility,
1131: !use_syslog);
1.375 dtucker 1132:
1133: if (debug_flag)
1.541 dtucker 1134: logit("%s, %s", SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 1135:
1.400 djm 1136: /* Parse the configuration files */
1.496 djm 1137: process_config_files(host_arg, pw, 0, &want_final_pass);
1138: if (want_final_pass)
1139: debug("configuration requests final Match pass");
1.400 djm 1140:
1141: /* Hostname canonicalisation needs a few options filled. */
1142: fill_default_options_for_canonicalization(&options);
1143:
1144: /* If the user has replaced the hostname then take it into use now */
1145: if (options.hostname != NULL) {
1146: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1147: cp = percent_expand(options.hostname,
1148: "h", host, (char *)NULL);
1149: free(host);
1150: host = cp;
1.408 djm 1151: free(options.hostname);
1152: options.hostname = xstrdup(host);
1.400 djm 1153: }
1154:
1.470 djm 1155: /* Don't lowercase addresses, they will be explicitly canonicalised */
1156: if ((was_addr = is_addr(host)) == 0)
1157: lowercase(host);
1158:
1159: /*
1160: * Try to canonicalize if requested by configuration or the
1161: * hostname is an address.
1162: */
1163: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1164: addrs = resolve_canonicalize(&host, options.port);
1165:
1.139 markus 1166: /*
1.401 djm 1167: * If CanonicalizePermittedCNAMEs have been specified but
1168: * other canonicalization did not happen (by not being requested
1169: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1170: * as a result of CNAME following.
1.401 djm 1171: *
1172: * Try to resolve the bare hostname name using the system resolver's
1173: * usual search rules and then apply the CNAME follow rules.
1174: *
1175: * Skip the lookup if a ProxyCommand is being used unless the user
1176: * has specifically requested canonicalisation for this case via
1177: * CanonicalizeHostname=always
1.139 markus 1178: */
1.443 djm 1179: direct = option_clear_or_none(options.proxy_command) &&
1180: options.jump_host == NULL;
1181: if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1182: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1183: if ((addrs = resolve_host(host, options.port,
1.493 djm 1184: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1185: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1186: if (direct)
1.403 djm 1187: cleanup_exit(255); /* logged in resolve_host */
1188: } else
1.443 djm 1189: check_follow_cname(direct, &host, cname);
1.400 djm 1190: }
1.139 markus 1191:
1.400 djm 1192: /*
1.408 djm 1193: * If canonicalisation is enabled then re-parse the configuration
1194: * files as new stanzas may match.
1.400 djm 1195: */
1.496 djm 1196: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1197: debug("hostname canonicalisation enabled, "
1198: "will re-parse configuration");
1199: want_final_pass = 1;
1200: }
1201:
1202: if (want_final_pass) {
1203: debug("re-parsing configuration");
1.408 djm 1204: free(options.hostname);
1205: options.hostname = xstrdup(host);
1.496 djm 1206: process_config_files(host_arg, pw, 1, NULL);
1.408 djm 1207: /*
1208: * Address resolution happens early with canonicalisation
1209: * enabled and the port number may have changed since, so
1210: * reset it in address list
1211: */
1212: if (addrs != NULL && options.port > 0)
1213: set_addrinfo_port(addrs, options.port);
1.139 markus 1214: }
1.31 markus 1215:
1216: /* Fill configuration defaults. */
1.543 djm 1217: if (fill_default_options(&options) != 0)
1218: cleanup_exit(255);
1.443 djm 1219:
1.534 dtucker 1220: if (options.user == NULL)
1221: options.user = xstrdup(pw->pw_name);
1222:
1.443 djm 1223: /*
1224: * If ProxyJump option specified, then construct a ProxyCommand now.
1225: */
1226: if (options.jump_host != NULL) {
1227: char port_s[8];
1.534 dtucker 1228: const char *jumpuser = options.jump_user, *sshbin = argv0;
1.520 dtucker 1229: int port = options.port, jumpport = options.jump_port;
1230:
1231: if (port <= 0)
1232: port = default_ssh_port();
1233: if (jumpport <= 0)
1234: jumpport = default_ssh_port();
1.534 dtucker 1235: if (jumpuser == NULL)
1236: jumpuser = options.user;
1237: if (strcmp(options.jump_host, host) == 0 && port == jumpport &&
1238: strcmp(options.user, jumpuser) == 0)
1.520 dtucker 1239: fatal("jumphost loop via %s", options.jump_host);
1.478 djm 1240:
1241: /*
1242: * Try to use SSH indicated by argv[0], but fall back to
1243: * "ssh" if it appears unavailable.
1244: */
1245: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1246: sshbin = "ssh";
1.443 djm 1247:
1248: /* Consistency check */
1249: if (options.proxy_command != NULL)
1250: fatal("inconsistent options: ProxyCommand+ProxyJump");
1251: /* Never use FD passing for ProxyJump */
1252: options.proxy_use_fdpass = 0;
1253: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1254: xasprintf(&options.proxy_command,
1.478 djm 1255: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1256: sshbin,
1.443 djm 1257: /* Optional "-l user" argument if jump_user set */
1258: options.jump_user == NULL ? "" : " -l ",
1259: options.jump_user == NULL ? "" : options.jump_user,
1260: /* Optional "-p port" argument if jump_port set */
1261: options.jump_port <= 0 ? "" : " -p ",
1262: options.jump_port <= 0 ? "" : port_s,
1263: /* Optional additional jump hosts ",..." */
1264: options.jump_extra == NULL ? "" : " -J ",
1265: options.jump_extra == NULL ? "" : options.jump_extra,
1266: /* Optional "-F" argumment if -F specified */
1267: config == NULL ? "" : " -F ",
1268: config == NULL ? "" : config,
1269: /* Optional "-v" arguments if -v set */
1270: debug_flag ? " -" : "",
1271: debug_flag, "vvv",
1272: /* Mandatory hostname */
1273: options.jump_host);
1274: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1275: options.proxy_command);
1276: }
1.31 markus 1277:
1.400 djm 1278: if (options.port == 0)
1279: options.port = default_ssh_port();
1.463 djm 1280: channel_set_af(ssh, options.address_family);
1.196 djm 1281:
1.383 djm 1282: /* Tidy and check options */
1283: if (options.host_key_alias != NULL)
1284: lowercase(options.host_key_alias);
1285: if (options.proxy_command != NULL &&
1286: strcmp(options.proxy_command, "-") == 0 &&
1287: options.proxy_use_fdpass)
1288: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.516 markus 1289: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1290: if (options.control_persist && options.control_path != NULL) {
1291: debug("UpdateHostKeys=ask is incompatible with "
1292: "ControlPersist; disabling");
1293: options.update_hostkeys = 0;
1294: } else if (sshbuf_len(command) != 0 ||
1295: options.remote_command != NULL ||
1296: options.request_tty == REQUEST_TTY_NO) {
1297: debug("UpdateHostKeys=ask is incompatible with "
1298: "remote command execution; disabling");
1.517 djm 1299: options.update_hostkeys = 0;
1300: } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1301: /* no point logging anything; user won't see it */
1.516 markus 1302: options.update_hostkeys = 0;
1303: }
1.415 djm 1304: }
1.430 djm 1305: if (options.connection_attempts <= 0)
1306: fatal("Invalid number of ConnectionAttempts");
1307:
1.482 markus 1308: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1309: fatal("Cannot execute command-line and remote command.");
1310:
1311: /* Cannot fork to background if no command. */
1.482 markus 1312: if (fork_after_authentication_flag && sshbuf_len(command) == 0 &&
1.560 djm 1313: options.remote_command == NULL && options.session_type != SESSION_TYPE_NONE)
1.461 bluhm 1314: fatal("Cannot fork into background without a command "
1315: "to execute.");
1316:
1.31 markus 1317: /* reinit */
1.452 dtucker 1318: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.559 djm 1319: for (j = 0; j < options.num_log_verbose; j++) {
1320: if (strcasecmp(options.log_verbose[j], "none") == 0)
1321: break;
1.539 djm 1322: log_verbose_add(options.log_verbose[j]);
1.559 djm 1323: }
1.370 djm 1324:
1325: if (options.request_tty == REQUEST_TTY_YES ||
1326: options.request_tty == REQUEST_TTY_FORCE)
1327: tty_flag = 1;
1328:
1329: /* Allocate a tty by default if no command specified. */
1.482 markus 1330: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1331: tty_flag = options.request_tty != REQUEST_TTY_NO;
1332:
1333: /* Force no tty */
1.447 markus 1334: if (options.request_tty == REQUEST_TTY_NO ||
1335: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
1.370 djm 1336: tty_flag = 0;
1337: /* Do not allocate a tty if stdin is not a tty. */
1338: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1339: options.request_tty != REQUEST_TTY_FORCE) {
1340: if (tty_flag)
1341: logit("Pseudo-terminal will not be allocated because "
1342: "stdin is not a terminal.");
1343: tty_flag = 0;
1344: }
1.343 djm 1345:
1.466 djm 1346: /* Set up strings used to percent_expand() arguments */
1.544 djm 1347: cinfo = xcalloc(1, sizeof(*cinfo));
1.358 djm 1348: if (gethostname(thishost, sizeof(thishost)) == -1)
1349: fatal("gethostname: %s", strerror(errno));
1.544 djm 1350: cinfo->thishost = xstrdup(thishost);
1351: thishost[strcspn(thishost, ".")] = '\0';
1352: cinfo->shorthost = xstrdup(thishost);
1353: xasprintf(&cinfo->portstr, "%d", options.port);
1354: xasprintf(&cinfo->uidstr, "%llu",
1.479 djm 1355: (unsigned long long)pw->pw_uid);
1.544 djm 1356: cinfo->keyalias = xstrdup(options.host_key_alias ?
1357: options.host_key_alias : host_arg);
1358: cinfo->conn_hash_hex = ssh_connection_hash(cinfo->thishost, host,
1359: cinfo->portstr, options.user);
1360: cinfo->host_arg = xstrdup(host_arg);
1361: cinfo->remhost = xstrdup(host);
1362: cinfo->remuser = xstrdup(options.user);
1363: cinfo->homedir = xstrdup(pw->pw_dir);
1364: cinfo->locuser = xstrdup(pw->pw_name);
1.405 djm 1365:
1.466 djm 1366: /*
1367: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1368: * after port-forwarding is set up, so it may pick up any local
1369: * tunnel interface name allocated.
1370: */
1.461 bluhm 1371: if (options.remote_command != NULL) {
1372: debug3("expanding RemoteCommand: %s", options.remote_command);
1373: cp = options.remote_command;
1.527 dtucker 1374: options.remote_command = default_client_percent_expand(cp,
1.544 djm 1375: cinfo);
1.461 bluhm 1376: debug3("expanded RemoteCommand: %s", options.remote_command);
1377: free(cp);
1.482 markus 1378: if ((r = sshbuf_put(command, options.remote_command,
1379: strlen(options.remote_command))) != 0)
1.540 djm 1380: fatal_fr(r, "buffer error");
1.304 dtucker 1381: }
1.31 markus 1382:
1.214 djm 1383: if (options.control_path != NULL) {
1.490 dtucker 1384: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1385: free(options.control_path);
1.528 dtucker 1386: options.control_path = default_client_percent_dollar_expand(cp,
1.544 djm 1387: cinfo);
1.378 djm 1388: free(cp);
1.214 djm 1389: }
1.408 djm 1390:
1.522 dtucker 1391: if (options.identity_agent != NULL) {
1392: p = tilde_expand_filename(options.identity_agent, getuid());
1.544 djm 1393: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1394: free(p);
1395: free(options.identity_agent);
1396: options.identity_agent = cp;
1397: }
1398:
1399: if (options.forward_agent_sock_path != NULL) {
1400: p = tilde_expand_filename(options.forward_agent_sock_path,
1401: getuid());
1.544 djm 1402: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1403: free(p);
1404: free(options.forward_agent_sock_path);
1405: options.forward_agent_sock_path = cp;
1.552 djm 1406: if (stat(options.forward_agent_sock_path, &st) != 0) {
1407: error("Cannot forward agent socket path \"%s\": %s",
1408: options.forward_agent_sock_path, strerror(errno));
1409: if (options.exit_on_forward_failure)
1410: cleanup_exit(255);
1411: }
1.532 dtucker 1412: }
1413:
1.545 djm 1414: if (options.num_system_hostfiles > 0 &&
1415: strcasecmp(options.system_hostfiles[0], "none") == 0) {
1416: if (options.num_system_hostfiles > 1)
1417: fatal("Invalid GlobalKnownHostsFiles: \"none\" "
1418: "appears with other entries");
1419: free(options.system_hostfiles[0]);
1420: options.system_hostfiles[0] = NULL;
1421: options.num_system_hostfiles = 0;
1422: }
1423:
1424: if (options.num_user_hostfiles > 0 &&
1425: strcasecmp(options.user_hostfiles[0], "none") == 0) {
1426: if (options.num_user_hostfiles > 1)
1427: fatal("Invalid UserKnownHostsFiles: \"none\" "
1428: "appears with other entries");
1429: free(options.user_hostfiles[0]);
1430: options.user_hostfiles[0] = NULL;
1431: options.num_user_hostfiles = 0;
1432: }
1.532 dtucker 1433: for (j = 0; j < options.num_user_hostfiles; j++) {
1.545 djm 1434: if (options.user_hostfiles[j] == NULL)
1435: continue;
1436: cp = tilde_expand_filename(options.user_hostfiles[j], getuid());
1437: p = default_client_percent_dollar_expand(cp, cinfo);
1438: if (strcmp(options.user_hostfiles[j], p) != 0)
1439: debug3("expanded UserKnownHostsFile '%s' -> "
1440: "'%s'", options.user_hostfiles[j], p);
1441: free(options.user_hostfiles[j]);
1442: free(cp);
1443: options.user_hostfiles[j] = p;
1.522 dtucker 1444: }
1445:
1.527 dtucker 1446: for (i = 0; i < options.num_local_forwards; i++) {
1447: if (options.local_forwards[i].listen_path != NULL) {
1448: cp = options.local_forwards[i].listen_path;
1449: p = options.local_forwards[i].listen_path =
1.544 djm 1450: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1451: if (strcmp(cp, p) != 0)
1452: debug3("expanded LocalForward listen path "
1453: "'%s' -> '%s'", cp, p);
1454: free(cp);
1455: }
1456: if (options.local_forwards[i].connect_path != NULL) {
1457: cp = options.local_forwards[i].connect_path;
1458: p = options.local_forwards[i].connect_path =
1.544 djm 1459: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1460: if (strcmp(cp, p) != 0)
1461: debug3("expanded LocalForward connect path "
1462: "'%s' -> '%s'", cp, p);
1463: free(cp);
1464: }
1465: }
1466:
1467: for (i = 0; i < options.num_remote_forwards; i++) {
1468: if (options.remote_forwards[i].listen_path != NULL) {
1469: cp = options.remote_forwards[i].listen_path;
1470: p = options.remote_forwards[i].listen_path =
1.544 djm 1471: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1472: if (strcmp(cp, p) != 0)
1473: debug3("expanded RemoteForward listen path "
1474: "'%s' -> '%s'", cp, p);
1475: free(cp);
1476: }
1477: if (options.remote_forwards[i].connect_path != NULL) {
1478: cp = options.remote_forwards[i].connect_path;
1479: p = options.remote_forwards[i].connect_path =
1.544 djm 1480: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1481: if (strcmp(cp, p) != 0)
1482: debug3("expanded RemoteForward connect path "
1483: "'%s' -> '%s'", cp, p);
1484: free(cp);
1485: }
1486: }
1487:
1.408 djm 1488: if (config_test) {
1489: dump_client_config(&options, host);
1490: exit(0);
1.508 djm 1491: }
1492:
1493: /* Expand SecurityKeyProvider if it refers to an environment variable */
1494: if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1495: strlen(options.sk_provider) > 1) {
1496: if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1.518 naddy 1497: debug("Authenticator provider %s did not resolve; "
1.508 djm 1498: "disabling", options.sk_provider);
1499: free(options.sk_provider);
1500: options.sk_provider = NULL;
1501: } else {
1502: debug2("resolved SecurityKeyProvider %s => %s",
1503: options.sk_provider, cp);
1504: free(options.sk_provider);
1505: options.sk_provider = xstrdup(cp);
1506: }
1.408 djm 1507: }
1.405 djm 1508:
1.312 djm 1509: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1510: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1511: if (options.control_path != NULL) {
1512: int sock;
1513: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1514: ssh_packet_set_connection(ssh, sock, sock);
1.499 djm 1515: ssh_packet_set_mux(ssh);
1.447 markus 1516: goto skip_connect;
1517: }
1518: }
1.401 djm 1519:
1520: /*
1521: * If hostname canonicalisation was not enabled, then we may not
1522: * have yet resolved the hostname. Do so now.
1523: */
1524: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1525: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1526: if ((addrs = resolve_host(host, options.port, 1,
1527: cname, sizeof(cname))) == NULL)
1528: cleanup_exit(255); /* resolve_host logs the error */
1529: }
1.214 djm 1530:
1.542 dtucker 1531: if (options.connection_timeout >= INT_MAX/1000)
1532: timeout_ms = INT_MAX;
1533: else
1534: timeout_ms = options.connection_timeout * 1000;
1.303 djm 1535:
1.77 markus 1536: /* Open a connection to the remote host. */
1.511 beck 1537: if (ssh_connect(ssh, host, host_arg, addrs, &hostaddr, options.port,
1.538 kn 1538: options.connection_attempts,
1.488 dtucker 1539: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1540: exit(255);
1.31 markus 1541:
1.391 djm 1542: if (addrs != NULL)
1543: freeaddrinfo(addrs);
1544:
1.499 djm 1545: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1546: options.server_alive_count_max);
1547:
1.303 djm 1548: if (timeout_ms > 0)
1549: debug3("timeout: %d ms remain after connect", timeout_ms);
1550:
1.33 markus 1551: /*
1.485 dtucker 1552: * If we successfully made the connection and we have hostbased auth
1553: * enabled, load the public keys so we can later use the ssh-keysign
1554: * helper to sign challenges.
1.33 markus 1555: */
1.112 markus 1556: sensitive_data.nkeys = 0;
1557: sensitive_data.keys = NULL;
1.457 djm 1558: if (options.hostbased_authentication) {
1.486 dtucker 1559: sensitive_data.nkeys = 10;
1.274 deraadt 1560: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.483 markus 1561: sizeof(struct sshkey));
1562:
1563: /* XXX check errors? */
1.486 dtucker 1564: #define L_PUBKEY(p,o) do { \
1565: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1566: fatal_f("pubkey out of array bounds"); \
1.483 markus 1567: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.486 dtucker 1568: p, "pubkey"); \
1569: } while (0)
1570: #define L_CERT(p,o) do { \
1571: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1572: fatal_f("cert out of array bounds"); \
1.486 dtucker 1573: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), p, "cert"); \
1574: } while (0)
1.177 markus 1575:
1.485 dtucker 1576: if (options.hostbased_authentication == 1) {
1.486 dtucker 1577: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1578: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1579: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1580: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1581: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1582: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1583: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1584: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1585: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1586: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.173 markus 1587: }
1.367 djm 1588: }
1.31 markus 1589:
1.104 markus 1590: /* load options.identity_files */
1.544 djm 1591: load_public_identity_files(cinfo);
1.439 markus 1592:
1.476 djm 1593: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1594: if (options.identity_agent &&
1595: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1596: if (strcmp(options.identity_agent, "none") == 0) {
1597: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1598: } else {
1.522 dtucker 1599: cp = options.identity_agent;
1.528 dtucker 1600: /* legacy (limited) format */
1601: if (cp[0] == '$' && cp[1] != '{') {
1.494 djm 1602: if (!valid_env_name(cp + 1)) {
1603: fatal("Invalid IdentityAgent "
1604: "environment variable name %s", cp);
1605: }
1606: if ((p = getenv(cp + 1)) == NULL)
1607: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1608: else
1609: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1610: } else {
1611: /* identity_agent specifies a path directly */
1612: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1613: }
1.510 djm 1614: }
1615: }
1616:
1.522 dtucker 1617: if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1.526 djm 1618: cp = options.forward_agent_sock_path;
1.510 djm 1619: if (cp[0] == '$') {
1620: if (!valid_env_name(cp + 1)) {
1621: fatal("Invalid ForwardAgent environment variable name %s", cp);
1622: }
1623: if ((p = getenv(cp + 1)) != NULL)
1624: forward_agent_sock_path = p;
1625: else
1626: options.forward_agent = 0;
1627: free(cp);
1628: } else {
1629: forward_agent_sock_path = cp;
1.439 markus 1630: }
1631: }
1.104 markus 1632:
1633: /* Expand ~ in known host file names. */
1.361 djm 1634: tilde_expand_paths(options.system_hostfiles,
1635: options.num_system_hostfiles);
1636: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1637:
1.512 dtucker 1638: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1639: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1640:
1.316 djm 1641: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1642: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.546 djm 1643: options.port, pw, timeout_ms, cinfo);
1.339 djm 1644:
1.499 djm 1645: if (ssh_packet_connection_is_on_socket(ssh)) {
1.339 djm 1646: verbose("Authenticated to %s ([%s]:%d).", host,
1.437 djm 1647: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
1.339 djm 1648: } else {
1649: verbose("Authenticated to %s (via proxy).", host);
1650: }
1.31 markus 1651:
1.112 markus 1652: /* We no longer need the private host keys. Clear them now. */
1653: if (sensitive_data.nkeys != 0) {
1654: for (i = 0; i < sensitive_data.nkeys; i++) {
1655: if (sensitive_data.keys[i] != NULL) {
1656: /* Destroys contents safely */
1657: debug3("clear hostkey %d", i);
1.483 markus 1658: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1659: sensitive_data.keys[i] = NULL;
1660: }
1661: }
1.378 djm 1662: free(sensitive_data.keys);
1.134 markus 1663: }
1664: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1665: free(options.identity_files[i]);
1666: options.identity_files[i] = NULL;
1.134 markus 1667: if (options.identity_keys[i]) {
1.483 markus 1668: sshkey_free(options.identity_keys[i]);
1.134 markus 1669: options.identity_keys[i] = NULL;
1670: }
1.112 markus 1671: }
1.426 djm 1672: for (i = 0; i < options.num_certificate_files; i++) {
1673: free(options.certificate_files[i]);
1674: options.certificate_files[i] = NULL;
1675: }
1.553 djm 1676:
1677: #ifdef ENABLE_PKCS11
1678: (void)pkcs11_del_provider(options.pkcs11_provider);
1679: #endif
1.31 markus 1680:
1.447 markus 1681: skip_connect:
1.544 djm 1682: exit_status = ssh_session2(ssh, cinfo);
1683: ssh_conn_info_free(cinfo);
1.499 djm 1684: ssh_packet_close(ssh);
1.186 djm 1685:
1.312 djm 1686: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1687: unlink(options.control_path);
1688:
1.353 djm 1689: /* Kill ProxyCommand if it is running. */
1690: ssh_kill_proxy_command();
1.186 djm 1691:
1.45 markus 1692: return exit_status;
1693: }
1694:
1.344 djm 1695: static void
1696: control_persist_detach(void)
1697: {
1698: pid_t pid;
1699:
1.540 djm 1700: debug_f("backgrounding master process");
1.344 djm 1701:
1.473 djm 1702: /*
1703: * master (current process) into the background, and make the
1704: * foreground process a client of the backgrounded master.
1705: */
1.344 djm 1706: switch ((pid = fork())) {
1707: case -1:
1.540 djm 1708: fatal_f("fork: %s", strerror(errno));
1.344 djm 1709: case 0:
1710: /* Child: master process continues mainloop */
1.473 djm 1711: break;
1712: default:
1.531 djm 1713: /* Parent: set up mux client to connect to backgrounded master */
1.540 djm 1714: debug2_f("background process is %ld", (long)pid);
1.344 djm 1715: stdin_null_flag = ostdin_null_flag;
1.359 djm 1716: options.request_tty = orequest_tty;
1.344 djm 1717: tty_flag = otty_flag;
1.561 ! djm 1718: options.session_type = osession_type;
1.473 djm 1719: close(muxserver_sock);
1720: muxserver_sock = -1;
1.351 markus 1721: options.control_master = SSHCTL_MASTER_NO;
1.473 djm 1722: muxclient(options.control_path);
1.344 djm 1723: /* muxclient() doesn't return on success. */
1.473 djm 1724: fatal("Failed to connect to new control master");
1725: }
1.537 djm 1726: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1727: error_f("stdfd_devnull failed");
1.381 djm 1728: daemon(1, 1);
1.362 djm 1729: setproctitle("%s [mux]", options.control_path);
1.344 djm 1730: }
1731:
1732: /* Do fork() after authentication. Used by "ssh -f" */
1733: static void
1734: fork_postauth(void)
1735: {
1736: if (need_controlpersist_detach)
1737: control_persist_detach();
1738: debug("forking to background");
1739: fork_after_authentication_flag = 0;
1.505 deraadt 1740: if (daemon(1, 1) == -1)
1.344 djm 1741: fatal("daemon() failed: %.200s", strerror(errno));
1.537 djm 1742: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1743: error_f("stdfd_devnull failed");
1.344 djm 1744: }
1745:
1.523 djm 1746: static void
1747: forwarding_success(void)
1748: {
1.524 djm 1749: if (forward_confirms_pending == -1)
1750: return;
1751: if (--forward_confirms_pending == 0) {
1.540 djm 1752: debug_f("all expected forwarding replies received");
1.523 djm 1753: if (fork_after_authentication_flag)
1754: fork_postauth();
1.524 djm 1755: } else {
1.540 djm 1756: debug2_f("%d expected forwarding replies remaining",
1757: forward_confirms_pending);
1.523 djm 1758: }
1759: }
1760:
1.315 djm 1761: /* Callback for remote forward global requests */
1762: static void
1.463 djm 1763: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1764: {
1.406 millert 1765: struct Forward *rfwd = (struct Forward *)ctxt;
1.499 djm 1766: u_int port;
1767: int r;
1.315 djm 1768:
1.324 djm 1769: /* XXX verbose() on failure? */
1.404 markus 1770: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1771: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1772: rfwd->listen_path ? rfwd->listen_path :
1773: rfwd->listen_host ? rfwd->listen_host : "",
1774: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1775: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1776: rfwd->connect_host, rfwd->connect_port);
1777: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1778: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1.499 djm 1779: if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1.540 djm 1780: fatal_fr(r, "parse packet");
1.499 djm 1781: if (port > 65535) {
1782: error("Invalid allocated port %u for remote "
1783: "forward to %s:%d", port,
1784: rfwd->connect_host, rfwd->connect_port);
1785: /* Ensure failure processing runs below */
1786: type = SSH2_MSG_REQUEST_FAILURE;
1787: channel_update_permission(ssh,
1788: rfwd->handle, -1);
1789: } else {
1790: rfwd->allocated_port = (int)port;
1791: logit("Allocated port %u for remote "
1792: "forward to %s:%d",
1793: rfwd->allocated_port, rfwd->connect_host,
1794: rfwd->connect_port);
1795: channel_update_permission(ssh,
1796: rfwd->handle, rfwd->allocated_port);
1797: }
1.366 markus 1798: } else {
1.480 djm 1799: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1800: }
1.324 djm 1801: }
1.468 djm 1802:
1.315 djm 1803: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1804: if (options.exit_on_forward_failure) {
1805: if (rfwd->listen_path != NULL)
1806: fatal("Error: remote port forwarding failed "
1807: "for listen path %s", rfwd->listen_path);
1808: else
1809: fatal("Error: remote port forwarding failed "
1810: "for listen port %d", rfwd->listen_port);
1811: } else {
1812: if (rfwd->listen_path != NULL)
1813: logit("Warning: remote port forwarding failed "
1814: "for listen path %s", rfwd->listen_path);
1815: else
1816: logit("Warning: remote port forwarding failed "
1817: "for listen port %d", rfwd->listen_port);
1818: }
1.315 djm 1819: }
1.523 djm 1820: forwarding_success();
1.315 djm 1821: }
1822:
1.126 itojun 1823: static void
1.463 djm 1824: client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
1.331 dtucker 1825: {
1826: debug("stdio forwarding: done");
1827: cleanup_exit(0);
1828: }
1829:
1.368 djm 1830: static void
1.463 djm 1831: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1832: {
1833: if (!success)
1834: fatal("stdio forwarding failed");
1835: }
1836:
1837: static void
1.523 djm 1838: ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
1839: {
1840: if (!success) {
1841: error("Tunnel forwarding failed");
1842: if (options.exit_on_forward_failure)
1843: cleanup_exit(255);
1844: }
1845:
1.540 djm 1846: debug_f("tunnel forward established, id=%d", id);
1.523 djm 1847: forwarding_success();
1848: }
1849:
1850: static void
1.463 djm 1851: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1852: {
1853: Channel *c;
1.332 djm 1854: int in, out;
1.331 dtucker 1855:
1.441 dtucker 1856: if (options.stdio_forward_host == NULL)
1.368 djm 1857: return;
1858:
1.540 djm 1859: debug3_f("%s:%d", options.stdio_forward_host,
1.441 dtucker 1860: options.stdio_forward_port);
1.332 djm 1861:
1.505 deraadt 1862: if ((in = dup(STDIN_FILENO)) == -1 ||
1863: (out = dup(STDOUT_FILENO)) == -1)
1.557 djm 1864: fatal_f("dup() in/out failed");
1.463 djm 1865: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.557 djm 1866: options.stdio_forward_port, in, out,
1867: CHANNEL_NONBLOCK_STDIO)) == NULL)
1.540 djm 1868: fatal_f("channel_connect_stdio_fwd failed");
1.463 djm 1869: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1870: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1871: }
1872:
1873: static void
1.551 markus 1874: ssh_init_forward_permissions(struct ssh *ssh, const char *what, char **opens,
1875: u_int num_opens)
1876: {
1877: u_int i;
1878: int port;
1879: char *addr, *arg, *oarg, ch;
1880: int where = FORWARD_LOCAL;
1881:
1882: channel_clear_permission(ssh, FORWARD_ADM, where);
1883: if (num_opens == 0)
1884: return; /* permit any */
1885:
1886: /* handle keywords: "any" / "none" */
1887: if (num_opens == 1 && strcmp(opens[0], "any") == 0)
1888: return;
1889: if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
1890: channel_disable_admin(ssh, where);
1891: return;
1892: }
1893: /* Otherwise treat it as a list of permitted host:port */
1894: for (i = 0; i < num_opens; i++) {
1895: oarg = arg = xstrdup(opens[i]);
1896: ch = '\0';
1897: addr = hpdelim2(&arg, &ch);
1898: if (addr == NULL || ch == '/')
1899: fatal_f("missing host in %s", what);
1900: addr = cleanhostname(addr);
1901: if (arg == NULL || ((port = permitopen_port(arg)) < 0))
1902: fatal_f("bad port number in %s", what);
1903: /* Send it to channels layer */
1904: channel_add_permission(ssh, FORWARD_ADM,
1905: where, addr, port);
1906: free(oarg);
1907: }
1908: }
1909:
1910: static void
1.466 djm 1911: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1912: {
1.86 markus 1913: int success = 0;
1.70 markus 1914: int i;
1.551 markus 1915:
1916: ssh_init_forward_permissions(ssh, "permitremoteopen",
1917: options.permitted_remote_opens,
1918: options.num_permitted_remote_opens);
1.331 dtucker 1919:
1.524 djm 1920: if (options.exit_on_forward_failure)
1921: forward_confirms_pending = 0; /* track pending requests */
1.70 markus 1922: /* Initiate local TCP/IP port forwardings. */
1923: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1924: debug("Local connections to %.200s:%d forwarded to remote "
1925: "address %.200s:%d",
1.406 millert 1926: (options.local_forwards[i].listen_path != NULL) ?
1927: options.local_forwards[i].listen_path :
1.234 deraadt 1928: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1929: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1930: options.local_forwards[i].listen_host,
1931: options.local_forwards[i].listen_port,
1.406 millert 1932: (options.local_forwards[i].connect_path != NULL) ?
1933: options.local_forwards[i].connect_path :
1.232 djm 1934: options.local_forwards[i].connect_host,
1935: options.local_forwards[i].connect_port);
1.463 djm 1936: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1937: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1938: }
1.283 markus 1939: if (i > 0 && success != i && options.exit_on_forward_failure)
1940: fatal("Could not request local forwarding.");
1.86 markus 1941: if (i > 0 && success == 0)
1942: error("Could not request local forwarding.");
1.70 markus 1943:
1944: /* Initiate remote TCP/IP port forwardings. */
1945: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1946: debug("Remote connections from %.200s:%d forwarded to "
1947: "local address %.200s:%d",
1.406 millert 1948: (options.remote_forwards[i].listen_path != NULL) ?
1949: options.remote_forwards[i].listen_path :
1.248 djm 1950: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1951: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1952: options.remote_forwards[i].listen_port,
1.406 millert 1953: (options.remote_forwards[i].connect_path != NULL) ?
1954: options.remote_forwards[i].connect_path :
1.232 djm 1955: options.remote_forwards[i].connect_host,
1956: options.remote_forwards[i].connect_port);
1.523 djm 1957: if ((options.remote_forwards[i].handle =
1.463 djm 1958: channel_request_remote_forwarding(ssh,
1.523 djm 1959: &options.remote_forwards[i])) >= 0) {
1.463 djm 1960: client_register_global_confirm(
1961: ssh_confirm_remote_forward,
1.366 markus 1962: &options.remote_forwards[i]);
1.523 djm 1963: forward_confirms_pending++;
1964: } else if (options.exit_on_forward_failure)
1965: fatal("Could not request remote forwarding.");
1966: else
1967: logit("Warning: Could not request remote forwarding.");
1.70 markus 1968: }
1.301 djm 1969:
1970: /* Initiate tunnel forwarding. */
1971: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1972: if ((*ifname = client_request_tun_fwd(ssh,
1973: options.tun_open, options.tun_local,
1.523 djm 1974: options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
1975: forward_confirms_pending++;
1976: else if (options.exit_on_forward_failure)
1977: fatal("Could not request tunnel forwarding.");
1978: else
1979: error("Could not request tunnel forwarding.");
1.524 djm 1980: }
1981: if (forward_confirms_pending > 0) {
1.540 djm 1982: debug_f("expecting replies for %d forwards",
1.524 djm 1983: forward_confirms_pending);
1.468 djm 1984: }
1.70 markus 1985: }
1986:
1.126 itojun 1987: static void
1.70 markus 1988: check_agent_present(void)
1989: {
1.412 djm 1990: int r;
1991:
1.70 markus 1992: if (options.forward_agent) {
1.254 djm 1993: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1994: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1995: options.forward_agent = 0;
1.412 djm 1996: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.540 djm 1997: debug_r(r, "ssh_get_authentication_socket");
1.412 djm 1998: }
1.70 markus 1999: }
2000: }
2001:
1.214 djm 2002: static void
1.463 djm 2003: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 2004: {
1.215 djm 2005: extern char **environ;
1.558 djm 2006: const char *display, *term;
1.499 djm 2007: int r, interactive = tty_flag;
1.433 djm 2008: char *proto = NULL, *data = NULL;
1.337 djm 2009:
2010: if (!success)
2011: return; /* No need for error message, channels code sens one */
1.215 djm 2012:
1.248 djm 2013: display = getenv("DISPLAY");
1.417 djm 2014: if (display == NULL && options.forward_x11)
2015: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 2016: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 2017: options.xauth_location, options.forward_x11_trusted,
2018: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 2019: /* Request forwarding with authentication spoofing. */
1.316 djm 2020: debug("Requesting X11 forwarding with authentication "
2021: "spoofing.");
1.463 djm 2022: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 2023: data, 1);
1.463 djm 2024: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 2025: /* XXX exit_on_forward_failure */
1.80 markus 2026: interactive = 1;
1.50 markus 2027: }
2028:
1.70 markus 2029: check_agent_present();
2030: if (options.forward_agent) {
2031: debug("Requesting authentication agent forwarding.");
1.463 djm 2032: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 2033: if ((r = sshpkt_send(ssh)) != 0)
1.540 djm 2034: fatal_fr(r, "send packet");
1.212 djm 2035: }
1.369 dtucker 2036:
2037: /* Tell the packet module whether this is an interactive session. */
1.499 djm 2038: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 2039: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 2040:
1.558 djm 2041: if ((term = lookup_env_in_list("TERM", options.setenv,
2042: options.num_setenv)) == NULL || *term == '\0')
2043: term = getenv("TERM");
1.560 djm 2044: client_session2_setup(ssh, id, tty_flag, options.session_type == SESSION_TYPE_SUBSYSTEM, term,
1.482 markus 2045: NULL, fileno(stdin), command, environ);
1.45 markus 2046: }
2047:
1.143 markus 2048: /* open new channel for a session */
1.126 itojun 2049: static int
1.463 djm 2050: ssh_session2_open(struct ssh *ssh)
1.45 markus 2051: {
1.118 markus 2052: Channel *c;
2053: int window, packetmax, in, out, err;
1.60 markus 2054:
1.62 markus 2055: if (stdin_null_flag) {
1.93 itojun 2056: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 2057: } else {
2058: in = dup(STDIN_FILENO);
2059: }
1.60 markus 2060: out = dup(STDOUT_FILENO);
2061: err = dup(STDERR_FILENO);
1.45 markus 2062:
1.505 deraadt 2063: if (in == -1 || out == -1 || err == -1)
1.62 markus 2064: fatal("dup() in/out/err failed");
1.45 markus 2065:
1.65 markus 2066: window = CHAN_SES_WINDOW_DEFAULT;
2067: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 2068: if (tty_flag) {
2069: window >>= 1;
2070: packetmax >>= 1;
1.45 markus 2071: }
1.463 djm 2072: c = channel_new(ssh,
1.45 markus 2073: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 2074: window, packetmax, CHAN_EXTENDED_WRITE,
1.557 djm 2075: "client-session", CHANNEL_NONBLOCK_STDIO);
1.45 markus 2076:
1.540 djm 2077: debug3_f("channel_new: %d", c->self);
1.106 markus 2078:
1.463 djm 2079: channel_send_open(ssh, c->self);
1.560 djm 2080: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2081: channel_register_open_confirm(ssh, c->self,
1.310 djm 2082: ssh_session2_setup, NULL);
1.106 markus 2083:
1.118 markus 2084: return c->self;
1.106 markus 2085: }
2086:
1.126 itojun 2087: static int
1.544 djm 2088: ssh_session2(struct ssh *ssh, const struct ssh_conn_info *cinfo)
1.106 markus 2089: {
1.537 djm 2090: int r, id = -1;
1.466 djm 2091: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 2092:
2093: /* XXX should be pre-session */
1.368 djm 2094: if (!options.control_persist)
1.463 djm 2095: ssh_init_stdio_forwarding(ssh);
1.466 djm 2096:
2097: ssh_init_forwarding(ssh, &tun_fwd_ifname);
2098:
2099: if (options.local_command != NULL) {
2100: debug3("expanding LocalCommand: %s", options.local_command);
2101: cp = options.local_command;
2102: options.local_command = percent_expand(cp,
1.546 djm 2103: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.466 djm 2104: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2105: (char *)NULL);
2106: debug3("expanded LocalCommand: %s", options.local_command);
2107: free(cp);
2108: }
1.106 markus 2109:
1.344 djm 2110: /* Start listening for multiplex clients */
1.499 djm 2111: if (!ssh_packet_get_mux(ssh))
1.463 djm 2112: muxserver_listen(ssh);
1.344 djm 2113:
1.473 djm 2114: /*
1.368 djm 2115: * If we are in control persist mode and have a working mux listen
2116: * socket, then prepare to background ourselves and have a foreground
1.531 djm 2117: * client attach as a control client.
1.368 djm 2118: * NB. we must save copies of the flags that we override for
1.531 djm 2119: * the backgrounding, since we defer attachment of the client until
1.344 djm 2120: * after the connection is fully established (in particular,
2121: * async rfwd replies have been received for ExitOnForwardFailure).
2122: */
1.473 djm 2123: if (options.control_persist && muxserver_sock != -1) {
1.344 djm 2124: ostdin_null_flag = stdin_null_flag;
1.560 djm 2125: osession_type = options.session_type;
1.359 djm 2126: orequest_tty = options.request_tty;
1.344 djm 2127: otty_flag = tty_flag;
1.473 djm 2128: stdin_null_flag = 1;
1.560 djm 2129: options.session_type = SESSION_TYPE_NONE;
1.473 djm 2130: tty_flag = 0;
1.556 djm 2131: if (!fork_after_authentication_flag &&
1.560 djm 2132: (osession_type != SESSION_TYPE_NONE || options.stdio_forward_host != NULL))
1.344 djm 2133: need_controlpersist_detach = 1;
2134: fork_after_authentication_flag = 1;
1.473 djm 2135: }
1.368 djm 2136: /*
2137: * ControlPersist mux listen socket setup failed, attempt the
2138: * stdio forward setup that we skipped earlier.
2139: */
2140: if (options.control_persist && muxserver_sock == -1)
1.463 djm 2141: ssh_init_stdio_forwarding(ssh);
1.344 djm 2142:
1.560 djm 2143: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2144: id = ssh_session2_open(ssh);
1.379 djm 2145: else {
1.499 djm 2146: ssh_packet_set_interactive(ssh,
1.379 djm 2147: options.control_master == SSHCTL_MASTER_NO,
2148: options.ip_qos_interactive, options.ip_qos_bulk);
2149: }
1.314 djm 2150:
2151: /* If we don't expect to open a new session, then disallow it */
1.319 markus 2152: if (options.control_master == SSHCTL_MASTER_NO &&
1.549 djm 2153: (ssh->compat & SSH_NEW_OPENSSH)) {
1.314 djm 2154: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 2155: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2156: (r = sshpkt_put_cstring(ssh,
2157: "no-more-sessions@openssh.com")) != 0 ||
2158: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2159: (r = sshpkt_send(ssh)) != 0)
1.540 djm 2160: fatal_fr(r, "send packet");
1.314 djm 2161: }
1.255 reyk 2162:
2163: /* Execute a local command */
2164: if (options.local_command != NULL &&
2165: options.permit_local_command)
2166: ssh_local_cmd(options.local_command);
1.467 djm 2167:
2168: /*
2169: * stdout is now owned by the session channel; clobber it here
2170: * so future channel closes are propagated to the local fd.
2171: * NB. this can only happen after LocalCommand has completed,
2172: * as it may want to write to stdout.
2173: */
1.537 djm 2174: if (!need_controlpersist_detach && stdfd_devnull(0, 1, 0) == -1)
1.540 djm 2175: error_f("stdfd_devnull failed");
1.301 djm 2176:
1.342 djm 2177: /*
2178: * If requested and we are not interested in replies to remote
2179: * forwarding requests, then let ssh continue in the background.
2180: */
1.344 djm 2181: if (fork_after_authentication_flag) {
2182: if (options.exit_on_forward_failure &&
2183: options.num_remote_forwards > 0) {
2184: debug("deferring postauth fork until remote forward "
2185: "confirmation received");
2186: } else
2187: fork_postauth();
1.318 djm 2188: }
1.31 markus 2189:
1.463 djm 2190: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2191: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2192: }
2193:
1.426 djm 2194: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2195: static void
1.544 djm 2196: load_public_identity_files(const struct ssh_conn_info *cinfo)
1.104 markus 2197: {
1.466 djm 2198: char *filename, *cp;
1.460 markus 2199: struct sshkey *public;
1.426 djm 2200: int i;
2201: u_int n_ids, n_certs;
1.335 djm 2202: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2203: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2204: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2205: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2206: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2207: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2208: #ifdef ENABLE_PKCS11
1.514 djm 2209: struct sshkey **keys = NULL;
2210: char **comments = NULL;
1.333 markus 2211: int nkeys;
1.335 djm 2212: #endif /* PKCS11 */
1.104 markus 2213:
1.426 djm 2214: n_ids = n_certs = 0;
1.398 tedu 2215: memset(identity_files, 0, sizeof(identity_files));
2216: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2217: memset(identity_file_userprovided, 0,
2218: sizeof(identity_file_userprovided));
1.426 djm 2219: memset(certificate_files, 0, sizeof(certificate_files));
2220: memset(certificates, 0, sizeof(certificates));
1.484 djm 2221: memset(certificate_file_userprovided, 0,
2222: sizeof(certificate_file_userprovided));
1.335 djm 2223:
2224: #ifdef ENABLE_PKCS11
1.333 markus 2225: if (options.pkcs11_provider != NULL &&
1.167 markus 2226: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2227: (pkcs11_init(!options.batch_mode) == 0) &&
2228: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1.514 djm 2229: &keys, &comments)) > 0) {
1.333 markus 2230: for (i = 0; i < nkeys; i++) {
1.335 djm 2231: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2232: sshkey_free(keys[i]);
1.514 djm 2233: free(comments[i]);
1.335 djm 2234: continue;
2235: }
2236: identity_keys[n_ids] = keys[i];
1.514 djm 2237: identity_files[n_ids] = comments[i]; /* transferred */
1.335 djm 2238: n_ids++;
1.167 markus 2239: }
1.378 djm 2240: free(keys);
1.514 djm 2241: free(comments);
1.127 markus 2242: }
1.333 markus 2243: #endif /* ENABLE_PKCS11 */
1.335 djm 2244: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2245: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2246: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2247: free(options.identity_files[i]);
1.426 djm 2248: options.identity_files[i] = NULL;
1.335 djm 2249: continue;
2250: }
1.490 dtucker 2251: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.544 djm 2252: filename = default_client_percent_dollar_expand(cp, cinfo);
1.378 djm 2253: free(cp);
1.483 markus 2254: check_load(sshkey_load_public(filename, &public, NULL),
2255: filename, "pubkey");
1.131 millert 2256: debug("identity file %s type %d", filename,
2257: public ? public->type : -1);
1.378 djm 2258: free(options.identity_files[i]);
1.335 djm 2259: identity_files[n_ids] = filename;
2260: identity_keys[n_ids] = public;
1.484 djm 2261: identity_file_userprovided[n_ids] =
2262: options.identity_file_userprovided[i];
1.335 djm 2263: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2264: continue;
2265:
1.426 djm 2266: /*
2267: * If no certificates have been explicitly listed then try
2268: * to add the default certificate variant too.
2269: */
2270: if (options.num_certificate_files != 0)
2271: continue;
1.335 djm 2272: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2273: check_load(sshkey_load_public(cp, &public, NULL),
2274: filename, "pubkey");
1.335 djm 2275: debug("identity file %s type %d", cp,
2276: public ? public->type : -1);
2277: if (public == NULL) {
1.378 djm 2278: free(cp);
1.335 djm 2279: continue;
2280: }
1.483 markus 2281: if (!sshkey_is_cert(public)) {
1.540 djm 2282: debug_f("key %s type %s is not a certificate",
2283: cp, sshkey_type(public));
1.483 markus 2284: sshkey_free(public);
1.378 djm 2285: free(cp);
1.335 djm 2286: continue;
2287: }
1.448 djm 2288: /* NB. leave filename pointing to private key */
2289: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2290: identity_keys[n_ids] = public;
1.484 djm 2291: identity_file_userprovided[n_ids] =
2292: options.identity_file_userprovided[i];
1.335 djm 2293: n_ids++;
2294: }
1.426 djm 2295:
2296: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
1.540 djm 2297: fatal_f("too many certificates");
1.426 djm 2298: for (i = 0; i < options.num_certificate_files; i++) {
2299: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2300: getuid());
1.544 djm 2301: filename = default_client_percent_dollar_expand(cp, cinfo);
1.426 djm 2302: free(cp);
2303:
1.483 markus 2304: check_load(sshkey_load_public(filename, &public, NULL),
2305: filename, "certificate");
1.426 djm 2306: debug("certificate file %s type %d", filename,
2307: public ? public->type : -1);
2308: free(options.certificate_files[i]);
2309: options.certificate_files[i] = NULL;
2310: if (public == NULL) {
2311: free(filename);
2312: continue;
2313: }
1.483 markus 2314: if (!sshkey_is_cert(public)) {
1.540 djm 2315: debug_f("key %s type %s is not a certificate",
2316: filename, sshkey_type(public));
1.483 markus 2317: sshkey_free(public);
1.426 djm 2318: free(filename);
2319: continue;
2320: }
2321: certificate_files[n_certs] = filename;
2322: certificates[n_certs] = public;
1.484 djm 2323: certificate_file_userprovided[n_certs] =
2324: options.certificate_file_userprovided[i];
1.426 djm 2325: ++n_certs;
2326: }
2327:
1.335 djm 2328: options.num_identity_files = n_ids;
2329: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2330: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2331: memcpy(options.identity_file_userprovided,
2332: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2333:
2334: options.num_certificate_files = n_certs;
2335: memcpy(options.certificate_files,
2336: certificate_files, sizeof(certificate_files));
2337: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2338: memcpy(options.certificate_file_userprovided,
2339: certificate_file_userprovided,
2340: sizeof(certificate_file_userprovided));
1.214 djm 2341: }
1.352 djm 2342:
2343: static void
2344: main_sigchld_handler(int sig)
2345: {
2346: int save_errno = errno;
2347: pid_t pid;
2348: int status;
2349:
2350: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2351: (pid == -1 && errno == EINTR))
1.352 djm 2352: ;
2353: errno = save_errno;
2354: }
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