Annotation of src/usr.bin/ssh/ssh.c, Revision 1.581
1.581 ! dtucker 1: /* $OpenBSD: ssh.c,v 1.580 2022/11/09 00:15:59 djm Exp $ */
1.1 deraadt 2: /*
1.32 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * Ssh client program. This program can be used to log into a remote machine.
7: * The software supports strong authentication, encryption, and forwarding
8: * of X11, TCP/IP, and authentication connections.
9: *
1.64 deraadt 10: * As far as I am concerned, the code I have written for this software
11: * can be used freely for any purpose. Any derived versions of this
12: * software must be clearly marked as such, and if the derived work is
13: * incompatible with the protocol description in the RFC file, it must be
14: * called by a name other than "ssh" or "Secure Shell".
15: *
16: * Copyright (c) 1999 Niels Provos. All rights reserved.
1.202 markus 17: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 18: *
1.529 dtucker 19: * Modified to work with SSLeay by Niels Provos <provos@citi.umich.edu>
1.64 deraadt 20: * in Canada (German citizen).
21: *
22: * Redistribution and use in source and binary forms, with or without
23: * modification, are permitted provided that the following conditions
24: * are met:
25: * 1. Redistributions of source code must retain the above copyright
26: * notice, this list of conditions and the following disclaimer.
27: * 2. Redistributions in binary form must reproduce the above copyright
28: * notice, this list of conditions and the following disclaimer in the
29: * documentation and/or other materials provided with the distribution.
30: *
31: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 41: */
1.1 deraadt 42:
1.293 deraadt 43: #include <sys/types.h>
1.312 djm 44: #include <sys/ioctl.h>
45: #include <sys/queue.h>
1.259 stevesk 46: #include <sys/resource.h>
1.280 stevesk 47: #include <sys/socket.h>
1.264 stevesk 48: #include <sys/stat.h>
1.312 djm 49: #include <sys/time.h>
1.352 djm 50: #include <sys/wait.h>
1.258 stevesk 51:
1.265 stevesk 52: #include <ctype.h>
1.285 stevesk 53: #include <errno.h>
1.281 stevesk 54: #include <fcntl.h>
1.286 stevesk 55: #include <netdb.h>
1.258 stevesk 56: #include <paths.h>
1.279 stevesk 57: #include <pwd.h>
1.263 stevesk 58: #include <signal.h>
1.287 stevesk 59: #include <stddef.h>
1.291 stevesk 60: #include <stdio.h>
1.290 stevesk 61: #include <stdlib.h>
1.289 stevesk 62: #include <string.h>
1.509 naddy 63: #include <stdarg.h>
1.288 stevesk 64: #include <unistd.h>
1.414 deraadt 65: #include <limits.h>
1.445 djm 66: #include <locale.h>
1.49 markus 67:
1.402 markus 68: #ifdef WITH_OPENSSL
1.49 markus 69: #include <openssl/evp.h>
1.72 markus 70: #include <openssl/err.h>
1.402 markus 71: #endif
1.1 deraadt 72:
1.293 deraadt 73: #include "xmalloc.h"
1.84 markus 74: #include "ssh.h"
75: #include "ssh2.h"
1.341 djm 76: #include "canohost.h"
1.84 markus 77: #include "compat.h"
78: #include "cipher.h"
1.1 deraadt 79: #include "packet.h"
1.482 markus 80: #include "sshbuf.h"
1.123 markus 81: #include "channels.h"
1.483 markus 82: #include "sshkey.h"
1.58 markus 83: #include "authfd.h"
1.49 markus 84: #include "authfile.h"
1.83 markus 85: #include "pathnames.h"
1.214 djm 86: #include "dispatch.h"
1.81 markus 87: #include "clientloop.h"
1.84 markus 88: #include "log.h"
1.406 millert 89: #include "misc.h"
1.84 markus 90: #include "readconf.h"
91: #include "sshconnect.h"
1.95 markus 92: #include "kex.h"
93: #include "mac.h"
1.213 deraadt 94: #include "sshpty.h"
1.212 djm 95: #include "match.h"
1.214 djm 96: #include "msg.h"
1.278 stevesk 97: #include "version.h"
1.412 djm 98: #include "ssherr.h"
1.420 djm 99: #include "myproposal.h"
1.49 markus 100:
1.333 markus 101: #ifdef ENABLE_PKCS11
102: #include "ssh-pkcs11.h"
1.137 jakob 103: #endif
1.498 djm 104:
1.49 markus 105: extern char *__progname;
1.1 deraadt 106:
1.316 djm 107: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 108: int debug_flag = 0;
109:
1.359 djm 110: /* Flag indicating whether a tty should be requested */
1.1 deraadt 111: int tty_flag = 0;
112:
1.33 markus 113: /*
1.344 djm 114: * Flag indicating that the current process should be backgrounded and
1.531 djm 115: * a new mux-client launched in the foreground for ControlPersist.
1.344 djm 116: */
117: int need_controlpersist_detach = 0;
118:
1.531 djm 119: /* Copies of flags for ControlPersist foreground mux-client */
1.560 djm 120: int ostdin_null_flag, osession_type, otty_flag, orequest_tty;
1.344 djm 121:
122: /*
1.33 markus 123: * General data structure for command line options and options configurable
124: * in configuration files. See readconf.h.
125: */
1.1 deraadt 126: Options options;
127:
1.139 markus 128: /* optional user configfile */
129: char *config = NULL;
130:
1.33 markus 131: /*
132: * Name of the host we are connecting to. This is the name given on the
1.503 jmc 133: * command line, or the Hostname specified for the user-supplied name in a
1.33 markus 134: * configuration file.
135: */
1.1 deraadt 136: char *host;
137:
1.510 djm 138: /*
139: * A config can specify a path to forward, overriding SSH_AUTH_SOCK. If this is
140: * not NULL, forward the socket at this path instead.
141: */
142: char *forward_agent_sock_path = NULL;
143:
1.22 provos 144: /* socket address the host resolves to */
1.37 markus 145: struct sockaddr_storage hostaddr;
1.1 deraadt 146:
1.112 markus 147: /* Private host keys. */
1.173 markus 148: Sensitive sensitive_data;
1.1 deraadt 149:
1.45 markus 150: /* command to be executed */
1.482 markus 151: struct sshbuf *command;
1.45 markus 152:
1.170 markus 153: /* # of replies received for global requests */
1.523 djm 154: static int forward_confirms_pending = -1;
1.170 markus 155:
1.313 djm 156: /* mux.c */
157: extern int muxserver_sock;
158: extern u_int muxclient_command;
159:
1.1 deraadt 160: /* Prints a help message to the user. This function never returns. */
161:
1.126 itojun 162: static void
1.93 itojun 163: usage(void)
1.1 deraadt 164: {
1.208 markus 165: fprintf(stderr,
1.474 djm 166: "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n"
167: " [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n"
168: " [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n"
169: " [-i identity_file] [-J [user@]host[:port]] [-L address]\n"
170: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
171: " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
1.567 dtucker 172: " [-w local_tun[:remote_tun]] destination [command [argument ...]]\n"
1.208 markus 173: );
1.257 dtucker 174: exit(255);
1.1 deraadt 175: }
176:
1.544 djm 177: static int ssh_session2(struct ssh *, const struct ssh_conn_info *);
178: static void load_public_identity_files(const struct ssh_conn_info *);
1.352 djm 179: static void main_sigchld_handler(int);
1.312 djm 180:
1.361 djm 181: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
182: static void
183: tilde_expand_paths(char **paths, u_int num_paths)
184: {
185: u_int i;
186: char *cp;
187:
188: for (i = 0; i < num_paths; i++) {
1.490 dtucker 189: cp = tilde_expand_filename(paths[i], getuid());
1.378 djm 190: free(paths[i]);
1.361 djm 191: paths[i] = cp;
192: }
193: }
194:
1.527 dtucker 195: /*
196: * Expands the set of percent_expand options used by the majority of keywords
197: * in the client that support percent expansion.
198: * Caller must free returned string.
199: */
200: static char *
1.544 djm 201: default_client_percent_expand(const char *str,
202: const struct ssh_conn_info *cinfo)
1.527 dtucker 203: {
204: return percent_expand(str,
1.546 djm 205: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.527 dtucker 206: (char *)NULL);
207: }
208:
1.400 djm 209: /*
1.528 dtucker 210: * Expands the set of percent_expand options used by the majority of keywords
211: * AND perform environment variable substitution.
212: * Caller must free returned string.
213: */
214: static char *
1.544 djm 215: default_client_percent_dollar_expand(const char *str,
216: const struct ssh_conn_info *cinfo)
1.528 dtucker 217: {
218: char *ret;
219:
220: ret = percent_dollar_expand(str,
1.546 djm 221: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.528 dtucker 222: (char *)NULL);
223: if (ret == NULL)
224: fatal("invalid environment variable expansion");
225: return ret;
226: }
227:
228: /*
1.400 djm 229: * Attempt to resolve a host name / port to a set of addresses and
230: * optionally return any CNAMEs encountered along the way.
231: * Returns NULL on failure.
232: * NB. this function must operate with a options having undefined members.
233: */
1.385 djm 234: static struct addrinfo *
1.400 djm 235: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 236: {
237: char strport[NI_MAXSERV];
1.579 djm 238: const char *errstr = NULL;
1.385 djm 239: struct addrinfo hints, *res;
1.501 dtucker 240: int gaierr;
241: LogLevel loglevel = SYSLOG_LEVEL_DEBUG1;
1.385 djm 242:
1.400 djm 243: if (port <= 0)
244: port = default_ssh_port();
1.521 markus 245: if (cname != NULL)
246: *cname = '\0';
1.568 djm 247: debug3_f("lookup %s:%d", name, port);
1.400 djm 248:
1.427 djm 249: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 250: memset(&hints, 0, sizeof(hints));
1.400 djm 251: hints.ai_family = options.address_family == -1 ?
252: AF_UNSPEC : options.address_family;
1.385 djm 253: hints.ai_socktype = SOCK_STREAM;
254: if (cname != NULL)
255: hints.ai_flags = AI_CANONNAME;
256: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
257: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
258: loglevel = SYSLOG_LEVEL_ERROR;
259: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
260: __progname, name, ssh_gai_strerror(gaierr));
261: return NULL;
262: }
263: if (cname != NULL && res->ai_canonname != NULL) {
1.579 djm 264: if (!valid_domain(res->ai_canonname, 0, &errstr)) {
265: error("ignoring bad CNAME \"%s\" for host \"%s\": %s",
266: res->ai_canonname, name, errstr);
267: } else if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
1.540 djm 268: error_f("host \"%s\" cname \"%s\" too long (max %lu)",
269: name, res->ai_canonname, (u_long)clen);
1.385 djm 270: if (clen > 0)
271: *cname = '\0';
272: }
273: }
274: return res;
275: }
276:
1.470 djm 277: /* Returns non-zero if name can only be an address and not a hostname */
278: static int
279: is_addr_fast(const char *name)
280: {
281: return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
282: strspn(name, "0123456789.") == strlen(name));
283: }
284:
285: /* Returns non-zero if name represents a valid, single address */
286: static int
287: is_addr(const char *name)
288: {
289: char strport[NI_MAXSERV];
290: struct addrinfo hints, *res;
291:
292: if (is_addr_fast(name))
293: return 1;
294:
295: snprintf(strport, sizeof strport, "%u", default_ssh_port());
296: memset(&hints, 0, sizeof(hints));
297: hints.ai_family = options.address_family == -1 ?
298: AF_UNSPEC : options.address_family;
299: hints.ai_socktype = SOCK_STREAM;
300: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
301: if (getaddrinfo(name, strport, &hints, &res) != 0)
302: return 0;
303: if (res == NULL || res->ai_next != NULL) {
304: freeaddrinfo(res);
305: return 0;
306: }
307: freeaddrinfo(res);
308: return 1;
309: }
310:
1.385 djm 311: /*
1.413 djm 312: * Attempt to resolve a numeric host address / port to a single address.
313: * Returns a canonical address string.
314: * Returns NULL on failure.
315: * NB. this function must operate with a options having undefined members.
316: */
317: static struct addrinfo *
318: resolve_addr(const char *name, int port, char *caddr, size_t clen)
319: {
320: char addr[NI_MAXHOST], strport[NI_MAXSERV];
321: struct addrinfo hints, *res;
322: int gaierr;
323:
324: if (port <= 0)
325: port = default_ssh_port();
326: snprintf(strport, sizeof strport, "%u", port);
327: memset(&hints, 0, sizeof(hints));
328: hints.ai_family = options.address_family == -1 ?
329: AF_UNSPEC : options.address_family;
330: hints.ai_socktype = SOCK_STREAM;
331: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
332: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
1.540 djm 333: debug2_f("could not resolve name %.100s as address: %s",
334: name, ssh_gai_strerror(gaierr));
1.413 djm 335: return NULL;
336: }
337: if (res == NULL) {
1.540 djm 338: debug_f("getaddrinfo %.100s returned no addresses", name);
1.413 djm 339: return NULL;
340: }
341: if (res->ai_next != NULL) {
1.540 djm 342: debug_f("getaddrinfo %.100s returned multiple addresses", name);
1.413 djm 343: goto fail;
344: }
345: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
346: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
1.540 djm 347: debug_f("Could not format address for name %.100s: %s",
348: name, ssh_gai_strerror(gaierr));
1.413 djm 349: goto fail;
350: }
351: if (strlcpy(caddr, addr, clen) >= clen) {
1.540 djm 352: error_f("host \"%s\" addr \"%s\" too long (max %lu)",
353: name, addr, (u_long)clen);
1.413 djm 354: if (clen > 0)
355: *caddr = '\0';
356: fail:
357: freeaddrinfo(res);
358: return NULL;
359: }
360: return res;
361: }
362:
363: /*
1.385 djm 364: * Check whether the cname is a permitted replacement for the hostname
365: * and perform the replacement if it is.
1.400 djm 366: * NB. this function must operate with a options having undefined members.
1.385 djm 367: */
368: static int
1.443 djm 369: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 370: {
371: int i;
372: struct allowed_cname *rule;
373:
1.568 djm 374: if (*cname == '\0' || !config_has_permitted_cnames(&options) ||
1.385 djm 375: strcmp(*namep, cname) == 0)
376: return 0;
1.386 djm 377: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 378: return 0;
379: /*
1.386 djm 380: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 381: * a proxy or jump host unless the user specifically requests so.
1.385 djm 382: */
1.443 djm 383: if (!direct &&
1.386 djm 384: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 385: return 0;
1.540 djm 386: debug3_f("check \"%s\" CNAME \"%s\"", *namep, cname);
1.385 djm 387: for (i = 0; i < options.num_permitted_cnames; i++) {
388: rule = options.permitted_cnames + i;
1.418 djm 389: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
390: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 391: continue;
1.386 djm 392: verbose("Canonicalized DNS aliased hostname "
1.385 djm 393: "\"%s\" => \"%s\"", *namep, cname);
394: free(*namep);
395: *namep = xstrdup(cname);
396: return 1;
397: }
398: return 0;
399: }
400:
401: /*
402: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 403: * canonicalization rules. Returns the address list for the host or NULL
404: * if no name was found after canonicalization.
1.400 djm 405: * NB. this function must operate with a options having undefined members.
1.385 djm 406: */
407: static struct addrinfo *
1.400 djm 408: resolve_canonicalize(char **hostp, int port)
1.385 djm 409: {
1.443 djm 410: int i, direct, ndots;
1.413 djm 411: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 412: struct addrinfo *addrs;
413:
414: /*
1.470 djm 415: * Attempt to canonicalise addresses, regardless of
416: * whether hostname canonicalisation was requested
1.385 djm 417: */
1.413 djm 418: if ((addrs = resolve_addr(*hostp, port,
419: newname, sizeof(newname))) != NULL) {
1.540 djm 420: debug2_f("hostname %.100s is address", *hostp);
1.413 djm 421: if (strcasecmp(*hostp, newname) != 0) {
1.540 djm 422: debug2_f("canonicalised address \"%s\" => \"%s\"",
423: *hostp, newname);
1.413 djm 424: free(*hostp);
425: *hostp = xstrdup(newname);
426: }
427: return addrs;
428: }
429:
1.470 djm 430: /*
431: * If this looks like an address but didn't parse as one, it might
432: * be an address with an invalid interface scope. Skip further
433: * attempts at canonicalisation.
434: */
435: if (is_addr_fast(*hostp)) {
1.540 djm 436: debug_f("hostname %.100s is an unrecognised address", *hostp);
1.470 djm 437: return NULL;
438: }
439:
440: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
441: return NULL;
442:
443: /*
444: * Don't attempt to canonicalize names that will be interpreted by
445: * a proxy unless the user specifically requests so.
446: */
447: direct = option_clear_or_none(options.proxy_command) &&
448: options.jump_host == NULL;
449: if (!direct &&
450: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
451: return NULL;
452:
1.428 djm 453: /* If domain name is anchored, then resolve it now */
454: if ((*hostp)[strlen(*hostp) - 1] == '.') {
1.540 djm 455: debug3_f("name is fully qualified");
1.428 djm 456: fullhost = xstrdup(*hostp);
457: if ((addrs = resolve_host(fullhost, port, 0,
458: newname, sizeof(newname))) != NULL)
459: goto found;
460: free(fullhost);
461: goto notfound;
462: }
463:
1.387 djm 464: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 465: ndots = 0;
466: for (cp = *hostp; *cp != '\0'; cp++) {
467: if (*cp == '.')
468: ndots++;
469: }
1.386 djm 470: if (ndots > options.canonicalize_max_dots) {
1.540 djm 471: debug3_f("not canonicalizing hostname \"%s\" (max dots %d)",
472: *hostp, options.canonicalize_max_dots);
1.385 djm 473: return NULL;
474: }
475: /* Attempt each supplied suffix */
476: for (i = 0; i < options.num_canonical_domains; i++) {
1.559 djm 477: if (strcasecmp(options.canonical_domains[i], "none") == 0)
478: break;
1.385 djm 479: xasprintf(&fullhost, "%s.%s.", *hostp,
480: options.canonical_domains[i]);
1.540 djm 481: debug3_f("attempting \"%s\" => \"%s\"", *hostp, fullhost);
1.400 djm 482: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 483: newname, sizeof(newname))) == NULL) {
1.385 djm 484: free(fullhost);
485: continue;
486: }
1.428 djm 487: found:
1.385 djm 488: /* Remove trailing '.' */
489: fullhost[strlen(fullhost) - 1] = '\0';
490: /* Follow CNAME if requested */
1.443 djm 491: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 492: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 493: *hostp, fullhost);
494: }
495: free(*hostp);
496: *hostp = fullhost;
497: return addrs;
498: }
1.428 djm 499: notfound:
1.386 djm 500: if (!options.canonicalize_fallback_local)
1.400 djm 501: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
1.540 djm 502: debug2_f("host %s not found in any suffix", *hostp);
1.385 djm 503: return NULL;
504: }
505:
1.32 deraadt 506: /*
1.576 djm 507: * Check the result of hostkey loading, ignoring some errors and either
508: * discarding the key or fatal()ing for others.
1.483 markus 509: */
510: static void
1.576 djm 511: check_load(int r, struct sshkey **k, const char *path, const char *message)
1.483 markus 512: {
513: switch (r) {
514: case 0:
1.576 djm 515: /* Check RSA keys size and discard if undersized */
516: if (k != NULL && *k != NULL &&
517: (r = sshkey_check_rsa_length(*k,
518: options.required_rsa_size)) != 0) {
519: error_r(r, "load %s \"%s\"", message, path);
520: free(*k);
521: *k = NULL;
522: }
1.483 markus 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: */
1.577 djm 660: umask(022 | umask(077));
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"
1.574 djm 685: "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) { /* HUZdhjruz */
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':
1.563 djm 700: options.stdin_null = 1;
1.31 markus 701: break;
702: case 'f':
1.564 djm 703: options.fork_after_authentication = 1;
1.563 djm 704: options.stdin_null = 1;
1.31 markus 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:
1.575 djm 1118: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1119:
1.101 markus 1120: /*
1121: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1122: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1123: */
1.375 dtucker 1124: if (use_syslog && logfile != NULL)
1125: fatal("Can't specify both -y and -E");
1.422 dtucker 1126: if (logfile != NULL)
1.375 dtucker 1127: log_redirect_stderr_to(logfile);
1.325 markus 1128: log_init(argv0,
1.468 djm 1129: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1130: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1131: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1132: SYSLOG_FACILITY_USER : options.log_facility,
1133: !use_syslog);
1.375 dtucker 1134:
1135: if (debug_flag)
1.541 dtucker 1136: logit("%s, %s", SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 1137:
1.400 djm 1138: /* Parse the configuration files */
1.496 djm 1139: process_config_files(host_arg, pw, 0, &want_final_pass);
1140: if (want_final_pass)
1141: debug("configuration requests final Match pass");
1.400 djm 1142:
1143: /* Hostname canonicalisation needs a few options filled. */
1144: fill_default_options_for_canonicalization(&options);
1145:
1146: /* If the user has replaced the hostname then take it into use now */
1147: if (options.hostname != NULL) {
1148: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1149: cp = percent_expand(options.hostname,
1150: "h", host, (char *)NULL);
1151: free(host);
1152: host = cp;
1.408 djm 1153: free(options.hostname);
1154: options.hostname = xstrdup(host);
1.400 djm 1155: }
1156:
1.470 djm 1157: /* Don't lowercase addresses, they will be explicitly canonicalised */
1158: if ((was_addr = is_addr(host)) == 0)
1159: lowercase(host);
1160:
1161: /*
1162: * Try to canonicalize if requested by configuration or the
1163: * hostname is an address.
1164: */
1165: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1166: addrs = resolve_canonicalize(&host, options.port);
1167:
1.139 markus 1168: /*
1.401 djm 1169: * If CanonicalizePermittedCNAMEs have been specified but
1170: * other canonicalization did not happen (by not being requested
1171: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1172: * as a result of CNAME following.
1.401 djm 1173: *
1174: * Try to resolve the bare hostname name using the system resolver's
1175: * usual search rules and then apply the CNAME follow rules.
1176: *
1177: * Skip the lookup if a ProxyCommand is being used unless the user
1178: * has specifically requested canonicalisation for this case via
1179: * CanonicalizeHostname=always
1.139 markus 1180: */
1.443 djm 1181: direct = option_clear_or_none(options.proxy_command) &&
1182: options.jump_host == NULL;
1.568 djm 1183: if (addrs == NULL && config_has_permitted_cnames(&options) && (direct ||
1.443 djm 1184: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1185: if ((addrs = resolve_host(host, options.port,
1.493 djm 1186: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1187: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1188: if (direct)
1.403 djm 1189: cleanup_exit(255); /* logged in resolve_host */
1190: } else
1.443 djm 1191: check_follow_cname(direct, &host, cname);
1.400 djm 1192: }
1.139 markus 1193:
1.400 djm 1194: /*
1.408 djm 1195: * If canonicalisation is enabled then re-parse the configuration
1196: * files as new stanzas may match.
1.400 djm 1197: */
1.496 djm 1198: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1199: debug("hostname canonicalisation enabled, "
1200: "will re-parse configuration");
1201: want_final_pass = 1;
1202: }
1203:
1204: if (want_final_pass) {
1205: debug("re-parsing configuration");
1.408 djm 1206: free(options.hostname);
1207: options.hostname = xstrdup(host);
1.496 djm 1208: process_config_files(host_arg, pw, 1, NULL);
1.408 djm 1209: /*
1210: * Address resolution happens early with canonicalisation
1211: * enabled and the port number may have changed since, so
1212: * reset it in address list
1213: */
1214: if (addrs != NULL && options.port > 0)
1215: set_addrinfo_port(addrs, options.port);
1.139 markus 1216: }
1.31 markus 1217:
1218: /* Fill configuration defaults. */
1.543 djm 1219: if (fill_default_options(&options) != 0)
1220: cleanup_exit(255);
1.443 djm 1221:
1.534 dtucker 1222: if (options.user == NULL)
1223: options.user = xstrdup(pw->pw_name);
1224:
1.443 djm 1225: /*
1226: * If ProxyJump option specified, then construct a ProxyCommand now.
1227: */
1228: if (options.jump_host != NULL) {
1229: char port_s[8];
1.534 dtucker 1230: const char *jumpuser = options.jump_user, *sshbin = argv0;
1.520 dtucker 1231: int port = options.port, jumpport = options.jump_port;
1232:
1233: if (port <= 0)
1234: port = default_ssh_port();
1235: if (jumpport <= 0)
1236: jumpport = default_ssh_port();
1.534 dtucker 1237: if (jumpuser == NULL)
1238: jumpuser = options.user;
1239: if (strcmp(options.jump_host, host) == 0 && port == jumpport &&
1240: strcmp(options.user, jumpuser) == 0)
1.520 dtucker 1241: fatal("jumphost loop via %s", options.jump_host);
1.478 djm 1242:
1243: /*
1244: * Try to use SSH indicated by argv[0], but fall back to
1245: * "ssh" if it appears unavailable.
1246: */
1247: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1248: sshbin = "ssh";
1.443 djm 1249:
1250: /* Consistency check */
1251: if (options.proxy_command != NULL)
1252: fatal("inconsistent options: ProxyCommand+ProxyJump");
1253: /* Never use FD passing for ProxyJump */
1254: options.proxy_use_fdpass = 0;
1255: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1256: xasprintf(&options.proxy_command,
1.478 djm 1257: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1258: sshbin,
1.443 djm 1259: /* Optional "-l user" argument if jump_user set */
1260: options.jump_user == NULL ? "" : " -l ",
1261: options.jump_user == NULL ? "" : options.jump_user,
1262: /* Optional "-p port" argument if jump_port set */
1263: options.jump_port <= 0 ? "" : " -p ",
1264: options.jump_port <= 0 ? "" : port_s,
1265: /* Optional additional jump hosts ",..." */
1266: options.jump_extra == NULL ? "" : " -J ",
1267: options.jump_extra == NULL ? "" : options.jump_extra,
1.571 jsg 1268: /* Optional "-F" argument if -F specified */
1.443 djm 1269: config == NULL ? "" : " -F ",
1270: config == NULL ? "" : config,
1271: /* Optional "-v" arguments if -v set */
1272: debug_flag ? " -" : "",
1273: debug_flag, "vvv",
1274: /* Mandatory hostname */
1275: options.jump_host);
1276: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1277: options.proxy_command);
1278: }
1.31 markus 1279:
1.400 djm 1280: if (options.port == 0)
1281: options.port = default_ssh_port();
1.463 djm 1282: channel_set_af(ssh, options.address_family);
1.196 djm 1283:
1.383 djm 1284: /* Tidy and check options */
1285: if (options.host_key_alias != NULL)
1286: lowercase(options.host_key_alias);
1287: if (options.proxy_command != NULL &&
1288: strcmp(options.proxy_command, "-") == 0 &&
1289: options.proxy_use_fdpass)
1290: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.516 markus 1291: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1292: if (options.control_persist && options.control_path != NULL) {
1293: debug("UpdateHostKeys=ask is incompatible with "
1294: "ControlPersist; disabling");
1295: options.update_hostkeys = 0;
1296: } else if (sshbuf_len(command) != 0 ||
1297: options.remote_command != NULL ||
1298: options.request_tty == REQUEST_TTY_NO) {
1299: debug("UpdateHostKeys=ask is incompatible with "
1300: "remote command execution; disabling");
1.517 djm 1301: options.update_hostkeys = 0;
1302: } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1303: /* no point logging anything; user won't see it */
1.516 markus 1304: options.update_hostkeys = 0;
1305: }
1.415 djm 1306: }
1.430 djm 1307: if (options.connection_attempts <= 0)
1308: fatal("Invalid number of ConnectionAttempts");
1309:
1.482 markus 1310: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1311: fatal("Cannot execute command-line and remote command.");
1312:
1313: /* Cannot fork to background if no command. */
1.564 djm 1314: if (options.fork_after_authentication && sshbuf_len(command) == 0 &&
1.562 djm 1315: options.remote_command == NULL &&
1316: options.session_type != SESSION_TYPE_NONE)
1.461 bluhm 1317: fatal("Cannot fork into background without a command "
1318: "to execute.");
1319:
1.31 markus 1320: /* reinit */
1.452 dtucker 1321: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.559 djm 1322: for (j = 0; j < options.num_log_verbose; j++) {
1323: if (strcasecmp(options.log_verbose[j], "none") == 0)
1324: break;
1.539 djm 1325: log_verbose_add(options.log_verbose[j]);
1.559 djm 1326: }
1.370 djm 1327:
1328: if (options.request_tty == REQUEST_TTY_YES ||
1329: options.request_tty == REQUEST_TTY_FORCE)
1330: tty_flag = 1;
1331:
1332: /* Allocate a tty by default if no command specified. */
1.482 markus 1333: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1334: tty_flag = options.request_tty != REQUEST_TTY_NO;
1335:
1336: /* Force no tty */
1.447 markus 1337: if (options.request_tty == REQUEST_TTY_NO ||
1.570 djm 1338: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY) ||
1339: options.session_type == SESSION_TYPE_NONE)
1.370 djm 1340: tty_flag = 0;
1341: /* Do not allocate a tty if stdin is not a tty. */
1.563 djm 1342: if ((!isatty(fileno(stdin)) || options.stdin_null) &&
1.370 djm 1343: options.request_tty != REQUEST_TTY_FORCE) {
1344: if (tty_flag)
1345: logit("Pseudo-terminal will not be allocated because "
1346: "stdin is not a terminal.");
1347: tty_flag = 0;
1348: }
1.343 djm 1349:
1.466 djm 1350: /* Set up strings used to percent_expand() arguments */
1.544 djm 1351: cinfo = xcalloc(1, sizeof(*cinfo));
1.358 djm 1352: if (gethostname(thishost, sizeof(thishost)) == -1)
1353: fatal("gethostname: %s", strerror(errno));
1.544 djm 1354: cinfo->thishost = xstrdup(thishost);
1355: thishost[strcspn(thishost, ".")] = '\0';
1356: cinfo->shorthost = xstrdup(thishost);
1357: xasprintf(&cinfo->portstr, "%d", options.port);
1358: xasprintf(&cinfo->uidstr, "%llu",
1.479 djm 1359: (unsigned long long)pw->pw_uid);
1.544 djm 1360: cinfo->keyalias = xstrdup(options.host_key_alias ?
1361: options.host_key_alias : host_arg);
1362: cinfo->conn_hash_hex = ssh_connection_hash(cinfo->thishost, host,
1363: cinfo->portstr, options.user);
1364: cinfo->host_arg = xstrdup(host_arg);
1365: cinfo->remhost = xstrdup(host);
1366: cinfo->remuser = xstrdup(options.user);
1367: cinfo->homedir = xstrdup(pw->pw_dir);
1368: cinfo->locuser = xstrdup(pw->pw_name);
1.405 djm 1369:
1.466 djm 1370: /*
1371: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1372: * after port-forwarding is set up, so it may pick up any local
1373: * tunnel interface name allocated.
1374: */
1.461 bluhm 1375: if (options.remote_command != NULL) {
1376: debug3("expanding RemoteCommand: %s", options.remote_command);
1377: cp = options.remote_command;
1.527 dtucker 1378: options.remote_command = default_client_percent_expand(cp,
1.544 djm 1379: cinfo);
1.461 bluhm 1380: debug3("expanded RemoteCommand: %s", options.remote_command);
1381: free(cp);
1.482 markus 1382: if ((r = sshbuf_put(command, options.remote_command,
1383: strlen(options.remote_command))) != 0)
1.540 djm 1384: fatal_fr(r, "buffer error");
1.304 dtucker 1385: }
1.31 markus 1386:
1.214 djm 1387: if (options.control_path != NULL) {
1.490 dtucker 1388: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1389: free(options.control_path);
1.528 dtucker 1390: options.control_path = default_client_percent_dollar_expand(cp,
1.544 djm 1391: cinfo);
1.378 djm 1392: free(cp);
1.214 djm 1393: }
1.408 djm 1394:
1.522 dtucker 1395: if (options.identity_agent != NULL) {
1396: p = tilde_expand_filename(options.identity_agent, getuid());
1.544 djm 1397: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1398: free(p);
1399: free(options.identity_agent);
1400: options.identity_agent = cp;
1401: }
1402:
1403: if (options.forward_agent_sock_path != NULL) {
1404: p = tilde_expand_filename(options.forward_agent_sock_path,
1405: getuid());
1.544 djm 1406: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1407: free(p);
1408: free(options.forward_agent_sock_path);
1409: options.forward_agent_sock_path = cp;
1.552 djm 1410: if (stat(options.forward_agent_sock_path, &st) != 0) {
1411: error("Cannot forward agent socket path \"%s\": %s",
1412: options.forward_agent_sock_path, strerror(errno));
1413: if (options.exit_on_forward_failure)
1414: cleanup_exit(255);
1415: }
1.532 dtucker 1416: }
1417:
1.545 djm 1418: if (options.num_system_hostfiles > 0 &&
1419: strcasecmp(options.system_hostfiles[0], "none") == 0) {
1420: if (options.num_system_hostfiles > 1)
1421: fatal("Invalid GlobalKnownHostsFiles: \"none\" "
1422: "appears with other entries");
1423: free(options.system_hostfiles[0]);
1424: options.system_hostfiles[0] = NULL;
1425: options.num_system_hostfiles = 0;
1426: }
1427:
1428: if (options.num_user_hostfiles > 0 &&
1429: strcasecmp(options.user_hostfiles[0], "none") == 0) {
1430: if (options.num_user_hostfiles > 1)
1431: fatal("Invalid UserKnownHostsFiles: \"none\" "
1432: "appears with other entries");
1433: free(options.user_hostfiles[0]);
1434: options.user_hostfiles[0] = NULL;
1435: options.num_user_hostfiles = 0;
1436: }
1.532 dtucker 1437: for (j = 0; j < options.num_user_hostfiles; j++) {
1.545 djm 1438: if (options.user_hostfiles[j] == NULL)
1439: continue;
1440: cp = tilde_expand_filename(options.user_hostfiles[j], getuid());
1441: p = default_client_percent_dollar_expand(cp, cinfo);
1442: if (strcmp(options.user_hostfiles[j], p) != 0)
1443: debug3("expanded UserKnownHostsFile '%s' -> "
1444: "'%s'", options.user_hostfiles[j], p);
1445: free(options.user_hostfiles[j]);
1446: free(cp);
1447: options.user_hostfiles[j] = p;
1.522 dtucker 1448: }
1449:
1.527 dtucker 1450: for (i = 0; i < options.num_local_forwards; i++) {
1451: if (options.local_forwards[i].listen_path != NULL) {
1452: cp = options.local_forwards[i].listen_path;
1453: p = options.local_forwards[i].listen_path =
1.544 djm 1454: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1455: if (strcmp(cp, p) != 0)
1456: debug3("expanded LocalForward listen path "
1457: "'%s' -> '%s'", cp, p);
1458: free(cp);
1459: }
1460: if (options.local_forwards[i].connect_path != NULL) {
1461: cp = options.local_forwards[i].connect_path;
1462: p = options.local_forwards[i].connect_path =
1.544 djm 1463: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1464: if (strcmp(cp, p) != 0)
1465: debug3("expanded LocalForward connect path "
1466: "'%s' -> '%s'", cp, p);
1467: free(cp);
1468: }
1469: }
1470:
1471: for (i = 0; i < options.num_remote_forwards; i++) {
1472: if (options.remote_forwards[i].listen_path != NULL) {
1473: cp = options.remote_forwards[i].listen_path;
1474: p = options.remote_forwards[i].listen_path =
1.544 djm 1475: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1476: if (strcmp(cp, p) != 0)
1477: debug3("expanded RemoteForward listen path "
1478: "'%s' -> '%s'", cp, p);
1479: free(cp);
1480: }
1481: if (options.remote_forwards[i].connect_path != NULL) {
1482: cp = options.remote_forwards[i].connect_path;
1483: p = options.remote_forwards[i].connect_path =
1.544 djm 1484: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1485: if (strcmp(cp, p) != 0)
1486: debug3("expanded RemoteForward connect path "
1487: "'%s' -> '%s'", cp, p);
1488: free(cp);
1489: }
1490: }
1491:
1.408 djm 1492: if (config_test) {
1493: dump_client_config(&options, host);
1494: exit(0);
1.508 djm 1495: }
1496:
1497: /* Expand SecurityKeyProvider if it refers to an environment variable */
1498: if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1499: strlen(options.sk_provider) > 1) {
1500: if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1.518 naddy 1501: debug("Authenticator provider %s did not resolve; "
1.508 djm 1502: "disabling", options.sk_provider);
1503: free(options.sk_provider);
1504: options.sk_provider = NULL;
1505: } else {
1506: debug2("resolved SecurityKeyProvider %s => %s",
1507: options.sk_provider, cp);
1508: free(options.sk_provider);
1509: options.sk_provider = xstrdup(cp);
1510: }
1.408 djm 1511: }
1.405 djm 1512:
1.312 djm 1513: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1514: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1515: if (options.control_path != NULL) {
1516: int sock;
1517: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1518: ssh_packet_set_connection(ssh, sock, sock);
1.499 djm 1519: ssh_packet_set_mux(ssh);
1.447 markus 1520: goto skip_connect;
1521: }
1522: }
1.401 djm 1523:
1524: /*
1525: * If hostname canonicalisation was not enabled, then we may not
1526: * have yet resolved the hostname. Do so now.
1527: */
1528: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1529: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1530: if ((addrs = resolve_host(host, options.port, 1,
1531: cname, sizeof(cname))) == NULL)
1532: cleanup_exit(255); /* resolve_host logs the error */
1533: }
1.214 djm 1534:
1.542 dtucker 1535: if (options.connection_timeout >= INT_MAX/1000)
1536: timeout_ms = INT_MAX;
1537: else
1538: timeout_ms = options.connection_timeout * 1000;
1.303 djm 1539:
1.77 markus 1540: /* Open a connection to the remote host. */
1.511 beck 1541: if (ssh_connect(ssh, host, host_arg, addrs, &hostaddr, options.port,
1.538 kn 1542: options.connection_attempts,
1.488 dtucker 1543: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1544: exit(255);
1.31 markus 1545:
1.391 djm 1546: if (addrs != NULL)
1547: freeaddrinfo(addrs);
1548:
1.499 djm 1549: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1550: options.server_alive_count_max);
1551:
1.303 djm 1552: if (timeout_ms > 0)
1553: debug3("timeout: %d ms remain after connect", timeout_ms);
1554:
1.33 markus 1555: /*
1.485 dtucker 1556: * If we successfully made the connection and we have hostbased auth
1557: * enabled, load the public keys so we can later use the ssh-keysign
1558: * helper to sign challenges.
1.33 markus 1559: */
1.112 markus 1560: sensitive_data.nkeys = 0;
1561: sensitive_data.keys = NULL;
1.457 djm 1562: if (options.hostbased_authentication) {
1.581 ! dtucker 1563: int loaded = 0;
! 1564:
1.486 dtucker 1565: sensitive_data.nkeys = 10;
1.274 deraadt 1566: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.578 jsg 1567: sizeof(*sensitive_data.keys));
1.483 markus 1568:
1569: /* XXX check errors? */
1.486 dtucker 1570: #define L_PUBKEY(p,o) do { \
1571: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1572: fatal_f("pubkey out of array bounds"); \
1.483 markus 1573: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.576 djm 1574: &(sensitive_data.keys[o]), p, "pubkey"); \
1.581 ! dtucker 1575: if (sensitive_data.keys[o] != NULL) { \
1.572 djm 1576: debug2("hostbased key %d: %s key from \"%s\"", o, \
1577: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.581 ! dtucker 1578: loaded++; \
! 1579: } \
1.486 dtucker 1580: } while (0)
1581: #define L_CERT(p,o) do { \
1582: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1583: fatal_f("cert out of array bounds"); \
1.576 djm 1584: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), \
1585: &(sensitive_data.keys[o]), p, "cert"); \
1.581 ! dtucker 1586: if (sensitive_data.keys[o] != NULL) { \
1.572 djm 1587: debug2("hostbased key %d: %s cert from \"%s\"", o, \
1588: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.581 ! dtucker 1589: loaded++; \
! 1590: } \
1.486 dtucker 1591: } while (0)
1.177 markus 1592:
1.485 dtucker 1593: if (options.hostbased_authentication == 1) {
1.486 dtucker 1594: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1595: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1596: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1597: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1598: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1599: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1600: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1601: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1602: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1603: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.581 ! dtucker 1604: if (loaded == 0)
! 1605: debug("HostbasedAuthentication enabled but no "
! 1606: "local public host keys could be loaded.");
1.173 markus 1607: }
1.367 djm 1608: }
1.31 markus 1609:
1.104 markus 1610: /* load options.identity_files */
1.544 djm 1611: load_public_identity_files(cinfo);
1.439 markus 1612:
1.476 djm 1613: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1614: if (options.identity_agent &&
1615: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1616: if (strcmp(options.identity_agent, "none") == 0) {
1617: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1618: } else {
1.522 dtucker 1619: cp = options.identity_agent;
1.528 dtucker 1620: /* legacy (limited) format */
1621: if (cp[0] == '$' && cp[1] != '{') {
1.494 djm 1622: if (!valid_env_name(cp + 1)) {
1623: fatal("Invalid IdentityAgent "
1624: "environment variable name %s", cp);
1625: }
1626: if ((p = getenv(cp + 1)) == NULL)
1627: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1628: else
1629: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1630: } else {
1631: /* identity_agent specifies a path directly */
1632: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1633: }
1.510 djm 1634: }
1635: }
1636:
1.522 dtucker 1637: if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1.526 djm 1638: cp = options.forward_agent_sock_path;
1.510 djm 1639: if (cp[0] == '$') {
1640: if (!valid_env_name(cp + 1)) {
1641: fatal("Invalid ForwardAgent environment variable name %s", cp);
1642: }
1643: if ((p = getenv(cp + 1)) != NULL)
1.566 dtucker 1644: forward_agent_sock_path = xstrdup(p);
1.510 djm 1645: else
1646: options.forward_agent = 0;
1647: free(cp);
1648: } else {
1649: forward_agent_sock_path = cp;
1.439 markus 1650: }
1651: }
1.104 markus 1652:
1653: /* Expand ~ in known host file names. */
1.361 djm 1654: tilde_expand_paths(options.system_hostfiles,
1655: options.num_system_hostfiles);
1656: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1657:
1.512 dtucker 1658: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1659:
1.316 djm 1660: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1661: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.546 djm 1662: options.port, pw, timeout_ms, cinfo);
1.31 markus 1663:
1.112 markus 1664: /* We no longer need the private host keys. Clear them now. */
1665: if (sensitive_data.nkeys != 0) {
1666: for (i = 0; i < sensitive_data.nkeys; i++) {
1667: if (sensitive_data.keys[i] != NULL) {
1668: /* Destroys contents safely */
1669: debug3("clear hostkey %d", i);
1.483 markus 1670: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1671: sensitive_data.keys[i] = NULL;
1672: }
1673: }
1.378 djm 1674: free(sensitive_data.keys);
1.134 markus 1675: }
1676: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1677: free(options.identity_files[i]);
1678: options.identity_files[i] = NULL;
1.134 markus 1679: if (options.identity_keys[i]) {
1.483 markus 1680: sshkey_free(options.identity_keys[i]);
1.134 markus 1681: options.identity_keys[i] = NULL;
1682: }
1.112 markus 1683: }
1.426 djm 1684: for (i = 0; i < options.num_certificate_files; i++) {
1685: free(options.certificate_files[i]);
1686: options.certificate_files[i] = NULL;
1687: }
1.553 djm 1688:
1689: #ifdef ENABLE_PKCS11
1690: (void)pkcs11_del_provider(options.pkcs11_provider);
1691: #endif
1.31 markus 1692:
1.447 markus 1693: skip_connect:
1.544 djm 1694: exit_status = ssh_session2(ssh, cinfo);
1695: ssh_conn_info_free(cinfo);
1.499 djm 1696: ssh_packet_close(ssh);
1.186 djm 1697:
1.312 djm 1698: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1699: unlink(options.control_path);
1700:
1.353 djm 1701: /* Kill ProxyCommand if it is running. */
1702: ssh_kill_proxy_command();
1.186 djm 1703:
1.45 markus 1704: return exit_status;
1705: }
1706:
1.344 djm 1707: static void
1708: control_persist_detach(void)
1709: {
1710: pid_t pid;
1711:
1.540 djm 1712: debug_f("backgrounding master process");
1.344 djm 1713:
1.473 djm 1714: /*
1715: * master (current process) into the background, and make the
1716: * foreground process a client of the backgrounded master.
1717: */
1.344 djm 1718: switch ((pid = fork())) {
1719: case -1:
1.540 djm 1720: fatal_f("fork: %s", strerror(errno));
1.344 djm 1721: case 0:
1722: /* Child: master process continues mainloop */
1.473 djm 1723: break;
1724: default:
1.531 djm 1725: /* Parent: set up mux client to connect to backgrounded master */
1.540 djm 1726: debug2_f("background process is %ld", (long)pid);
1.563 djm 1727: options.stdin_null = ostdin_null_flag;
1.359 djm 1728: options.request_tty = orequest_tty;
1.344 djm 1729: tty_flag = otty_flag;
1.561 djm 1730: options.session_type = osession_type;
1.473 djm 1731: close(muxserver_sock);
1732: muxserver_sock = -1;
1.351 markus 1733: options.control_master = SSHCTL_MASTER_NO;
1.473 djm 1734: muxclient(options.control_path);
1.344 djm 1735: /* muxclient() doesn't return on success. */
1.473 djm 1736: fatal("Failed to connect to new control master");
1737: }
1.537 djm 1738: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1739: error_f("stdfd_devnull failed");
1.381 djm 1740: daemon(1, 1);
1.362 djm 1741: setproctitle("%s [mux]", options.control_path);
1.344 djm 1742: }
1743:
1744: /* Do fork() after authentication. Used by "ssh -f" */
1745: static void
1746: fork_postauth(void)
1747: {
1748: if (need_controlpersist_detach)
1749: control_persist_detach();
1750: debug("forking to background");
1.564 djm 1751: options.fork_after_authentication = 0;
1.505 deraadt 1752: if (daemon(1, 1) == -1)
1.344 djm 1753: fatal("daemon() failed: %.200s", strerror(errno));
1.537 djm 1754: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1755: error_f("stdfd_devnull failed");
1.344 djm 1756: }
1757:
1.523 djm 1758: static void
1759: forwarding_success(void)
1760: {
1.524 djm 1761: if (forward_confirms_pending == -1)
1762: return;
1763: if (--forward_confirms_pending == 0) {
1.540 djm 1764: debug_f("all expected forwarding replies received");
1.564 djm 1765: if (options.fork_after_authentication)
1.523 djm 1766: fork_postauth();
1.524 djm 1767: } else {
1.540 djm 1768: debug2_f("%d expected forwarding replies remaining",
1769: forward_confirms_pending);
1.523 djm 1770: }
1771: }
1772:
1.315 djm 1773: /* Callback for remote forward global requests */
1774: static void
1.463 djm 1775: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1776: {
1.406 millert 1777: struct Forward *rfwd = (struct Forward *)ctxt;
1.499 djm 1778: u_int port;
1779: int r;
1.315 djm 1780:
1.324 djm 1781: /* XXX verbose() on failure? */
1.404 markus 1782: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1783: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1784: rfwd->listen_path ? rfwd->listen_path :
1785: rfwd->listen_host ? rfwd->listen_host : "",
1786: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1787: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1788: rfwd->connect_host, rfwd->connect_port);
1789: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1790: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1.499 djm 1791: if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1.540 djm 1792: fatal_fr(r, "parse packet");
1.499 djm 1793: if (port > 65535) {
1794: error("Invalid allocated port %u for remote "
1795: "forward to %s:%d", port,
1796: rfwd->connect_host, rfwd->connect_port);
1797: /* Ensure failure processing runs below */
1798: type = SSH2_MSG_REQUEST_FAILURE;
1799: channel_update_permission(ssh,
1800: rfwd->handle, -1);
1801: } else {
1802: rfwd->allocated_port = (int)port;
1803: logit("Allocated port %u for remote "
1804: "forward to %s:%d",
1.569 dtucker 1805: rfwd->allocated_port, rfwd->connect_path ?
1806: rfwd->connect_path : rfwd->connect_host,
1.499 djm 1807: rfwd->connect_port);
1808: channel_update_permission(ssh,
1809: rfwd->handle, rfwd->allocated_port);
1810: }
1.366 markus 1811: } else {
1.480 djm 1812: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1813: }
1.324 djm 1814: }
1.468 djm 1815:
1.315 djm 1816: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1817: if (options.exit_on_forward_failure) {
1818: if (rfwd->listen_path != NULL)
1819: fatal("Error: remote port forwarding failed "
1820: "for listen path %s", rfwd->listen_path);
1821: else
1822: fatal("Error: remote port forwarding failed "
1823: "for listen port %d", rfwd->listen_port);
1824: } else {
1825: if (rfwd->listen_path != NULL)
1826: logit("Warning: remote port forwarding failed "
1827: "for listen path %s", rfwd->listen_path);
1828: else
1829: logit("Warning: remote port forwarding failed "
1830: "for listen port %d", rfwd->listen_port);
1831: }
1.315 djm 1832: }
1.523 djm 1833: forwarding_success();
1.315 djm 1834: }
1835:
1.126 itojun 1836: static void
1.463 djm 1837: client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
1.331 dtucker 1838: {
1839: debug("stdio forwarding: done");
1840: cleanup_exit(0);
1841: }
1842:
1.368 djm 1843: static void
1.463 djm 1844: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1845: {
1846: if (!success)
1847: fatal("stdio forwarding failed");
1848: }
1849:
1850: static void
1.523 djm 1851: ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
1852: {
1853: if (!success) {
1854: error("Tunnel forwarding failed");
1855: if (options.exit_on_forward_failure)
1856: cleanup_exit(255);
1857: }
1858:
1.540 djm 1859: debug_f("tunnel forward established, id=%d", id);
1.523 djm 1860: forwarding_success();
1861: }
1862:
1863: static void
1.463 djm 1864: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1865: {
1866: Channel *c;
1.332 djm 1867: int in, out;
1.331 dtucker 1868:
1.441 dtucker 1869: if (options.stdio_forward_host == NULL)
1.368 djm 1870: return;
1871:
1.540 djm 1872: debug3_f("%s:%d", options.stdio_forward_host,
1.441 dtucker 1873: options.stdio_forward_port);
1.332 djm 1874:
1.505 deraadt 1875: if ((in = dup(STDIN_FILENO)) == -1 ||
1876: (out = dup(STDOUT_FILENO)) == -1)
1.557 djm 1877: fatal_f("dup() in/out failed");
1.463 djm 1878: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.557 djm 1879: options.stdio_forward_port, in, out,
1880: CHANNEL_NONBLOCK_STDIO)) == NULL)
1.540 djm 1881: fatal_f("channel_connect_stdio_fwd failed");
1.463 djm 1882: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1883: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1884: }
1885:
1886: static void
1.551 markus 1887: ssh_init_forward_permissions(struct ssh *ssh, const char *what, char **opens,
1888: u_int num_opens)
1889: {
1890: u_int i;
1891: int port;
1.573 dtucker 1892: char *addr, *arg, *oarg;
1.551 markus 1893: int where = FORWARD_LOCAL;
1894:
1895: channel_clear_permission(ssh, FORWARD_ADM, where);
1896: if (num_opens == 0)
1897: return; /* permit any */
1898:
1899: /* handle keywords: "any" / "none" */
1900: if (num_opens == 1 && strcmp(opens[0], "any") == 0)
1901: return;
1902: if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
1903: channel_disable_admin(ssh, where);
1904: return;
1905: }
1906: /* Otherwise treat it as a list of permitted host:port */
1907: for (i = 0; i < num_opens; i++) {
1908: oarg = arg = xstrdup(opens[i]);
1.573 dtucker 1909: addr = hpdelim(&arg);
1910: if (addr == NULL)
1.551 markus 1911: fatal_f("missing host in %s", what);
1912: addr = cleanhostname(addr);
1913: if (arg == NULL || ((port = permitopen_port(arg)) < 0))
1914: fatal_f("bad port number in %s", what);
1915: /* Send it to channels layer */
1916: channel_add_permission(ssh, FORWARD_ADM,
1917: where, addr, port);
1918: free(oarg);
1919: }
1920: }
1921:
1922: static void
1.466 djm 1923: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1924: {
1.86 markus 1925: int success = 0;
1.70 markus 1926: int i;
1.551 markus 1927:
1928: ssh_init_forward_permissions(ssh, "permitremoteopen",
1929: options.permitted_remote_opens,
1930: options.num_permitted_remote_opens);
1.331 dtucker 1931:
1.524 djm 1932: if (options.exit_on_forward_failure)
1933: forward_confirms_pending = 0; /* track pending requests */
1.70 markus 1934: /* Initiate local TCP/IP port forwardings. */
1935: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1936: debug("Local connections to %.200s:%d forwarded to remote "
1937: "address %.200s:%d",
1.406 millert 1938: (options.local_forwards[i].listen_path != NULL) ?
1939: options.local_forwards[i].listen_path :
1.234 deraadt 1940: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1941: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1942: options.local_forwards[i].listen_host,
1943: options.local_forwards[i].listen_port,
1.406 millert 1944: (options.local_forwards[i].connect_path != NULL) ?
1945: options.local_forwards[i].connect_path :
1.232 djm 1946: options.local_forwards[i].connect_host,
1947: options.local_forwards[i].connect_port);
1.463 djm 1948: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1949: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1950: }
1.283 markus 1951: if (i > 0 && success != i && options.exit_on_forward_failure)
1952: fatal("Could not request local forwarding.");
1.86 markus 1953: if (i > 0 && success == 0)
1954: error("Could not request local forwarding.");
1.70 markus 1955:
1956: /* Initiate remote TCP/IP port forwardings. */
1957: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1958: debug("Remote connections from %.200s:%d forwarded to "
1959: "local address %.200s:%d",
1.406 millert 1960: (options.remote_forwards[i].listen_path != NULL) ?
1961: options.remote_forwards[i].listen_path :
1.248 djm 1962: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1963: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1964: options.remote_forwards[i].listen_port,
1.406 millert 1965: (options.remote_forwards[i].connect_path != NULL) ?
1966: options.remote_forwards[i].connect_path :
1.232 djm 1967: options.remote_forwards[i].connect_host,
1968: options.remote_forwards[i].connect_port);
1.523 djm 1969: if ((options.remote_forwards[i].handle =
1.463 djm 1970: channel_request_remote_forwarding(ssh,
1.523 djm 1971: &options.remote_forwards[i])) >= 0) {
1.463 djm 1972: client_register_global_confirm(
1973: ssh_confirm_remote_forward,
1.366 markus 1974: &options.remote_forwards[i]);
1.523 djm 1975: forward_confirms_pending++;
1976: } else if (options.exit_on_forward_failure)
1977: fatal("Could not request remote forwarding.");
1978: else
1979: logit("Warning: Could not request remote forwarding.");
1.70 markus 1980: }
1.301 djm 1981:
1982: /* Initiate tunnel forwarding. */
1983: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1984: if ((*ifname = client_request_tun_fwd(ssh,
1985: options.tun_open, options.tun_local,
1.523 djm 1986: options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
1987: forward_confirms_pending++;
1988: else if (options.exit_on_forward_failure)
1989: fatal("Could not request tunnel forwarding.");
1990: else
1991: error("Could not request tunnel forwarding.");
1.524 djm 1992: }
1993: if (forward_confirms_pending > 0) {
1.540 djm 1994: debug_f("expecting replies for %d forwards",
1.524 djm 1995: forward_confirms_pending);
1.468 djm 1996: }
1.70 markus 1997: }
1998:
1.126 itojun 1999: static void
1.70 markus 2000: check_agent_present(void)
2001: {
1.412 djm 2002: int r;
2003:
1.70 markus 2004: if (options.forward_agent) {
1.254 djm 2005: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 2006: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 2007: options.forward_agent = 0;
1.412 djm 2008: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.540 djm 2009: debug_r(r, "ssh_get_authentication_socket");
1.412 djm 2010: }
1.70 markus 2011: }
2012: }
2013:
1.214 djm 2014: static void
1.463 djm 2015: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 2016: {
1.215 djm 2017: extern char **environ;
1.558 djm 2018: const char *display, *term;
1.499 djm 2019: int r, interactive = tty_flag;
1.433 djm 2020: char *proto = NULL, *data = NULL;
1.337 djm 2021:
2022: if (!success)
1.580 djm 2023: return; /* No need for error message, channels code sends one */
1.215 djm 2024:
1.248 djm 2025: display = getenv("DISPLAY");
1.417 djm 2026: if (display == NULL && options.forward_x11)
2027: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 2028: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 2029: options.xauth_location, options.forward_x11_trusted,
2030: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 2031: /* Request forwarding with authentication spoofing. */
1.316 djm 2032: debug("Requesting X11 forwarding with authentication "
2033: "spoofing.");
1.463 djm 2034: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 2035: data, 1);
1.463 djm 2036: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 2037: /* XXX exit_on_forward_failure */
1.80 markus 2038: interactive = 1;
1.50 markus 2039: }
2040:
1.70 markus 2041: check_agent_present();
2042: if (options.forward_agent) {
2043: debug("Requesting authentication agent forwarding.");
1.463 djm 2044: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 2045: if ((r = sshpkt_send(ssh)) != 0)
1.540 djm 2046: fatal_fr(r, "send packet");
1.212 djm 2047: }
1.369 dtucker 2048:
2049: /* Tell the packet module whether this is an interactive session. */
1.499 djm 2050: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 2051: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 2052:
1.558 djm 2053: if ((term = lookup_env_in_list("TERM", options.setenv,
2054: options.num_setenv)) == NULL || *term == '\0')
2055: term = getenv("TERM");
1.562 djm 2056: client_session2_setup(ssh, id, tty_flag,
2057: options.session_type == SESSION_TYPE_SUBSYSTEM, term,
1.482 markus 2058: NULL, fileno(stdin), command, environ);
1.45 markus 2059: }
2060:
1.143 markus 2061: /* open new channel for a session */
1.126 itojun 2062: static int
1.463 djm 2063: ssh_session2_open(struct ssh *ssh)
1.45 markus 2064: {
1.118 markus 2065: Channel *c;
2066: int window, packetmax, in, out, err;
1.60 markus 2067:
1.563 djm 2068: if (options.stdin_null) {
1.93 itojun 2069: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 2070: } else {
2071: in = dup(STDIN_FILENO);
2072: }
1.60 markus 2073: out = dup(STDOUT_FILENO);
2074: err = dup(STDERR_FILENO);
1.45 markus 2075:
1.505 deraadt 2076: if (in == -1 || out == -1 || err == -1)
1.62 markus 2077: fatal("dup() in/out/err failed");
1.45 markus 2078:
1.65 markus 2079: window = CHAN_SES_WINDOW_DEFAULT;
2080: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 2081: if (tty_flag) {
2082: window >>= 1;
2083: packetmax >>= 1;
1.45 markus 2084: }
1.463 djm 2085: c = channel_new(ssh,
1.45 markus 2086: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 2087: window, packetmax, CHAN_EXTENDED_WRITE,
1.557 djm 2088: "client-session", CHANNEL_NONBLOCK_STDIO);
1.45 markus 2089:
1.540 djm 2090: debug3_f("channel_new: %d", c->self);
1.106 markus 2091:
1.463 djm 2092: channel_send_open(ssh, c->self);
1.560 djm 2093: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2094: channel_register_open_confirm(ssh, c->self,
1.310 djm 2095: ssh_session2_setup, NULL);
1.106 markus 2096:
1.118 markus 2097: return c->self;
1.106 markus 2098: }
2099:
1.126 itojun 2100: static int
1.544 djm 2101: ssh_session2(struct ssh *ssh, const struct ssh_conn_info *cinfo)
1.106 markus 2102: {
1.537 djm 2103: int r, id = -1;
1.466 djm 2104: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 2105:
2106: /* XXX should be pre-session */
1.368 djm 2107: if (!options.control_persist)
1.463 djm 2108: ssh_init_stdio_forwarding(ssh);
1.466 djm 2109:
2110: ssh_init_forwarding(ssh, &tun_fwd_ifname);
2111:
2112: if (options.local_command != NULL) {
2113: debug3("expanding LocalCommand: %s", options.local_command);
2114: cp = options.local_command;
2115: options.local_command = percent_expand(cp,
1.546 djm 2116: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.466 djm 2117: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2118: (char *)NULL);
2119: debug3("expanded LocalCommand: %s", options.local_command);
2120: free(cp);
2121: }
1.106 markus 2122:
1.344 djm 2123: /* Start listening for multiplex clients */
1.499 djm 2124: if (!ssh_packet_get_mux(ssh))
1.463 djm 2125: muxserver_listen(ssh);
1.344 djm 2126:
1.473 djm 2127: /*
1.368 djm 2128: * If we are in control persist mode and have a working mux listen
2129: * socket, then prepare to background ourselves and have a foreground
1.531 djm 2130: * client attach as a control client.
1.368 djm 2131: * NB. we must save copies of the flags that we override for
1.531 djm 2132: * the backgrounding, since we defer attachment of the client until
1.344 djm 2133: * after the connection is fully established (in particular,
2134: * async rfwd replies have been received for ExitOnForwardFailure).
2135: */
1.473 djm 2136: if (options.control_persist && muxserver_sock != -1) {
1.563 djm 2137: ostdin_null_flag = options.stdin_null;
1.560 djm 2138: osession_type = options.session_type;
1.359 djm 2139: orequest_tty = options.request_tty;
1.344 djm 2140: otty_flag = tty_flag;
1.563 djm 2141: options.stdin_null = 1;
1.560 djm 2142: options.session_type = SESSION_TYPE_NONE;
1.473 djm 2143: tty_flag = 0;
1.564 djm 2144: if (!options.fork_after_authentication &&
1.562 djm 2145: (osession_type != SESSION_TYPE_NONE ||
2146: options.stdio_forward_host != NULL))
1.344 djm 2147: need_controlpersist_detach = 1;
1.564 djm 2148: options.fork_after_authentication = 1;
1.473 djm 2149: }
1.368 djm 2150: /*
2151: * ControlPersist mux listen socket setup failed, attempt the
2152: * stdio forward setup that we skipped earlier.
2153: */
2154: if (options.control_persist && muxserver_sock == -1)
1.463 djm 2155: ssh_init_stdio_forwarding(ssh);
1.344 djm 2156:
1.560 djm 2157: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2158: id = ssh_session2_open(ssh);
1.379 djm 2159: else {
1.499 djm 2160: ssh_packet_set_interactive(ssh,
1.379 djm 2161: options.control_master == SSHCTL_MASTER_NO,
2162: options.ip_qos_interactive, options.ip_qos_bulk);
2163: }
1.314 djm 2164:
2165: /* If we don't expect to open a new session, then disallow it */
1.319 markus 2166: if (options.control_master == SSHCTL_MASTER_NO &&
1.549 djm 2167: (ssh->compat & SSH_NEW_OPENSSH)) {
1.314 djm 2168: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 2169: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2170: (r = sshpkt_put_cstring(ssh,
2171: "no-more-sessions@openssh.com")) != 0 ||
2172: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2173: (r = sshpkt_send(ssh)) != 0)
1.540 djm 2174: fatal_fr(r, "send packet");
1.314 djm 2175: }
1.255 reyk 2176:
2177: /* Execute a local command */
2178: if (options.local_command != NULL &&
2179: options.permit_local_command)
2180: ssh_local_cmd(options.local_command);
1.467 djm 2181:
2182: /*
2183: * stdout is now owned by the session channel; clobber it here
2184: * so future channel closes are propagated to the local fd.
2185: * NB. this can only happen after LocalCommand has completed,
2186: * as it may want to write to stdout.
2187: */
1.537 djm 2188: if (!need_controlpersist_detach && stdfd_devnull(0, 1, 0) == -1)
1.540 djm 2189: error_f("stdfd_devnull failed");
1.301 djm 2190:
1.342 djm 2191: /*
2192: * If requested and we are not interested in replies to remote
2193: * forwarding requests, then let ssh continue in the background.
2194: */
1.564 djm 2195: if (options.fork_after_authentication) {
1.344 djm 2196: if (options.exit_on_forward_failure &&
2197: options.num_remote_forwards > 0) {
2198: debug("deferring postauth fork until remote forward "
2199: "confirmation received");
2200: } else
2201: fork_postauth();
1.318 djm 2202: }
1.31 markus 2203:
1.463 djm 2204: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2205: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2206: }
2207:
1.426 djm 2208: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2209: static void
1.544 djm 2210: load_public_identity_files(const struct ssh_conn_info *cinfo)
1.104 markus 2211: {
1.466 djm 2212: char *filename, *cp;
1.460 markus 2213: struct sshkey *public;
1.426 djm 2214: int i;
2215: u_int n_ids, n_certs;
1.335 djm 2216: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2217: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2218: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2219: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2220: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2221: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2222: #ifdef ENABLE_PKCS11
1.514 djm 2223: struct sshkey **keys = NULL;
2224: char **comments = NULL;
1.333 markus 2225: int nkeys;
1.335 djm 2226: #endif /* PKCS11 */
1.104 markus 2227:
1.426 djm 2228: n_ids = n_certs = 0;
1.398 tedu 2229: memset(identity_files, 0, sizeof(identity_files));
2230: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2231: memset(identity_file_userprovided, 0,
2232: sizeof(identity_file_userprovided));
1.426 djm 2233: memset(certificate_files, 0, sizeof(certificate_files));
2234: memset(certificates, 0, sizeof(certificates));
1.484 djm 2235: memset(certificate_file_userprovided, 0,
2236: sizeof(certificate_file_userprovided));
1.335 djm 2237:
2238: #ifdef ENABLE_PKCS11
1.333 markus 2239: if (options.pkcs11_provider != NULL &&
1.167 markus 2240: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2241: (pkcs11_init(!options.batch_mode) == 0) &&
2242: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1.514 djm 2243: &keys, &comments)) > 0) {
1.333 markus 2244: for (i = 0; i < nkeys; i++) {
1.335 djm 2245: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2246: sshkey_free(keys[i]);
1.514 djm 2247: free(comments[i]);
1.335 djm 2248: continue;
2249: }
2250: identity_keys[n_ids] = keys[i];
1.514 djm 2251: identity_files[n_ids] = comments[i]; /* transferred */
1.335 djm 2252: n_ids++;
1.167 markus 2253: }
1.378 djm 2254: free(keys);
1.514 djm 2255: free(comments);
1.127 markus 2256: }
1.333 markus 2257: #endif /* ENABLE_PKCS11 */
1.335 djm 2258: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2259: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2260: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2261: free(options.identity_files[i]);
1.426 djm 2262: options.identity_files[i] = NULL;
1.335 djm 2263: continue;
2264: }
1.490 dtucker 2265: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.544 djm 2266: filename = default_client_percent_dollar_expand(cp, cinfo);
1.378 djm 2267: free(cp);
1.483 markus 2268: check_load(sshkey_load_public(filename, &public, NULL),
1.576 djm 2269: &public, filename, "pubkey");
1.131 millert 2270: debug("identity file %s type %d", filename,
2271: public ? public->type : -1);
1.378 djm 2272: free(options.identity_files[i]);
1.335 djm 2273: identity_files[n_ids] = filename;
2274: identity_keys[n_ids] = public;
1.484 djm 2275: identity_file_userprovided[n_ids] =
2276: options.identity_file_userprovided[i];
1.335 djm 2277: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2278: continue;
2279:
1.426 djm 2280: /*
2281: * If no certificates have been explicitly listed then try
2282: * to add the default certificate variant too.
2283: */
2284: if (options.num_certificate_files != 0)
2285: continue;
1.335 djm 2286: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2287: check_load(sshkey_load_public(cp, &public, NULL),
1.576 djm 2288: &public, filename, "pubkey");
1.335 djm 2289: debug("identity file %s type %d", cp,
2290: public ? public->type : -1);
2291: if (public == NULL) {
1.378 djm 2292: free(cp);
1.335 djm 2293: continue;
2294: }
1.483 markus 2295: if (!sshkey_is_cert(public)) {
1.540 djm 2296: debug_f("key %s type %s is not a certificate",
2297: cp, sshkey_type(public));
1.483 markus 2298: sshkey_free(public);
1.378 djm 2299: free(cp);
1.335 djm 2300: continue;
2301: }
1.448 djm 2302: /* NB. leave filename pointing to private key */
2303: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2304: identity_keys[n_ids] = public;
1.484 djm 2305: identity_file_userprovided[n_ids] =
2306: options.identity_file_userprovided[i];
1.335 djm 2307: n_ids++;
2308: }
1.426 djm 2309:
2310: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
1.540 djm 2311: fatal_f("too many certificates");
1.426 djm 2312: for (i = 0; i < options.num_certificate_files; i++) {
2313: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2314: getuid());
1.544 djm 2315: filename = default_client_percent_dollar_expand(cp, cinfo);
1.426 djm 2316: free(cp);
2317:
1.483 markus 2318: check_load(sshkey_load_public(filename, &public, NULL),
1.576 djm 2319: &public, filename, "certificate");
1.426 djm 2320: debug("certificate file %s type %d", filename,
2321: public ? public->type : -1);
2322: free(options.certificate_files[i]);
2323: options.certificate_files[i] = NULL;
2324: if (public == NULL) {
2325: free(filename);
2326: continue;
2327: }
1.483 markus 2328: if (!sshkey_is_cert(public)) {
1.540 djm 2329: debug_f("key %s type %s is not a certificate",
2330: filename, sshkey_type(public));
1.483 markus 2331: sshkey_free(public);
1.426 djm 2332: free(filename);
2333: continue;
2334: }
2335: certificate_files[n_certs] = filename;
2336: certificates[n_certs] = public;
1.484 djm 2337: certificate_file_userprovided[n_certs] =
2338: options.certificate_file_userprovided[i];
1.426 djm 2339: ++n_certs;
2340: }
2341:
1.335 djm 2342: options.num_identity_files = n_ids;
2343: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2344: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2345: memcpy(options.identity_file_userprovided,
2346: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2347:
2348: options.num_certificate_files = n_certs;
2349: memcpy(options.certificate_files,
2350: certificate_files, sizeof(certificate_files));
2351: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2352: memcpy(options.certificate_file_userprovided,
2353: certificate_file_userprovided,
2354: sizeof(certificate_file_userprovided));
1.214 djm 2355: }
1.352 djm 2356:
2357: static void
2358: main_sigchld_handler(int sig)
2359: {
2360: int save_errno = errno;
2361: pid_t pid;
2362: int status;
2363:
2364: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2365: (pid == -1 && errno == EINTR))
1.352 djm 2366: ;
2367: errno = save_errno;
2368: }
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