Annotation of src/usr.bin/ssh/ssh.c, Revision 1.594
1.594 ! djm 1: /* $OpenBSD: ssh.c,v 1.593 2023/07/26 23:06:00 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: */
1.593 djm 117: static int need_controlpersist_detach = 0;
1.344 djm 118:
1.531 djm 119: /* Copies of flags for ControlPersist foreground mux-client */
1.593 djm 120: static int ostdin_null_flag, osession_type, otty_flag, orequest_tty;
121: static int ofork_after_authentication;
1.344 djm 122:
123: /*
1.33 markus 124: * General data structure for command line options and options configurable
125: * in configuration files. See readconf.h.
126: */
1.1 deraadt 127: Options options;
128:
1.139 markus 129: /* optional user configfile */
130: char *config = NULL;
131:
1.33 markus 132: /*
133: * Name of the host we are connecting to. This is the name given on the
1.503 jmc 134: * command line, or the Hostname specified for the user-supplied name in a
1.33 markus 135: * configuration file.
136: */
1.1 deraadt 137: char *host;
138:
1.510 djm 139: /*
140: * A config can specify a path to forward, overriding SSH_AUTH_SOCK. If this is
141: * not NULL, forward the socket at this path instead.
142: */
143: char *forward_agent_sock_path = NULL;
144:
1.22 provos 145: /* socket address the host resolves to */
1.37 markus 146: struct sockaddr_storage hostaddr;
1.1 deraadt 147:
1.112 markus 148: /* Private host keys. */
1.173 markus 149: Sensitive sensitive_data;
1.1 deraadt 150:
1.45 markus 151: /* command to be executed */
1.482 markus 152: struct sshbuf *command;
1.45 markus 153:
1.170 markus 154: /* # of replies received for global requests */
1.523 djm 155: static int forward_confirms_pending = -1;
1.170 markus 156:
1.313 djm 157: /* mux.c */
158: extern int muxserver_sock;
159: extern u_int muxclient_command;
160:
1.1 deraadt 161: /* Prints a help message to the user. This function never returns. */
162:
1.126 itojun 163: static void
1.93 itojun 164: usage(void)
1.1 deraadt 165: {
1.208 markus 166: fprintf(stderr,
1.592 jmc 167: "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface] [-b bind_address]\n"
168: " [-c cipher_spec] [-D [bind_address:]port] [-E log_file]\n"
169: " [-e escape_char] [-F configfile] [-I pkcs11] [-i identity_file]\n"
170: " [-J destination] [-L address] [-l login_name] [-m mac_spec]\n"
171: " [-O ctl_cmd] [-o option] [-P tag] [-p port] [-Q query_option]\n"
172: " [-R address] [-S ctl_path] [-W host:port] [-w local_tun[:remote_tun]]\n"
173: " destination [command [argument ...]]\n"
1.208 markus 174: );
1.257 dtucker 175: exit(255);
1.1 deraadt 176: }
177:
1.544 djm 178: static int ssh_session2(struct ssh *, const struct ssh_conn_info *);
179: static void load_public_identity_files(const struct ssh_conn_info *);
1.352 djm 180: static void main_sigchld_handler(int);
1.312 djm 181:
1.361 djm 182: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
183: static void
184: tilde_expand_paths(char **paths, u_int num_paths)
185: {
186: u_int i;
187: char *cp;
188:
189: for (i = 0; i < num_paths; i++) {
1.490 dtucker 190: cp = tilde_expand_filename(paths[i], getuid());
1.378 djm 191: free(paths[i]);
1.361 djm 192: paths[i] = cp;
193: }
194: }
195:
1.527 dtucker 196: /*
197: * Expands the set of percent_expand options used by the majority of keywords
198: * in the client that support percent expansion.
199: * Caller must free returned string.
200: */
201: static char *
1.544 djm 202: default_client_percent_expand(const char *str,
203: const struct ssh_conn_info *cinfo)
1.527 dtucker 204: {
205: return percent_expand(str,
1.546 djm 206: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.527 dtucker 207: (char *)NULL);
208: }
209:
1.400 djm 210: /*
1.528 dtucker 211: * Expands the set of percent_expand options used by the majority of keywords
212: * AND perform environment variable substitution.
213: * Caller must free returned string.
214: */
215: static char *
1.544 djm 216: default_client_percent_dollar_expand(const char *str,
217: const struct ssh_conn_info *cinfo)
1.528 dtucker 218: {
219: char *ret;
220:
221: ret = percent_dollar_expand(str,
1.546 djm 222: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.528 dtucker 223: (char *)NULL);
224: if (ret == NULL)
225: fatal("invalid environment variable expansion");
226: return ret;
227: }
228:
229: /*
1.400 djm 230: * Attempt to resolve a host name / port to a set of addresses and
231: * optionally return any CNAMEs encountered along the way.
232: * Returns NULL on failure.
233: * NB. this function must operate with a options having undefined members.
234: */
1.385 djm 235: static struct addrinfo *
1.400 djm 236: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 237: {
238: char strport[NI_MAXSERV];
1.579 djm 239: const char *errstr = NULL;
1.385 djm 240: struct addrinfo hints, *res;
1.501 dtucker 241: int gaierr;
242: LogLevel loglevel = SYSLOG_LEVEL_DEBUG1;
1.385 djm 243:
1.400 djm 244: if (port <= 0)
245: port = default_ssh_port();
1.521 markus 246: if (cname != NULL)
247: *cname = '\0';
1.568 djm 248: debug3_f("lookup %s:%d", name, port);
1.400 djm 249:
1.427 djm 250: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 251: memset(&hints, 0, sizeof(hints));
1.400 djm 252: hints.ai_family = options.address_family == -1 ?
253: AF_UNSPEC : options.address_family;
1.385 djm 254: hints.ai_socktype = SOCK_STREAM;
255: if (cname != NULL)
256: hints.ai_flags = AI_CANONNAME;
257: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
258: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
259: loglevel = SYSLOG_LEVEL_ERROR;
260: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
261: __progname, name, ssh_gai_strerror(gaierr));
262: return NULL;
263: }
264: if (cname != NULL && res->ai_canonname != NULL) {
1.579 djm 265: if (!valid_domain(res->ai_canonname, 0, &errstr)) {
266: error("ignoring bad CNAME \"%s\" for host \"%s\": %s",
267: res->ai_canonname, name, errstr);
268: } else if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
1.540 djm 269: error_f("host \"%s\" cname \"%s\" too long (max %lu)",
270: name, res->ai_canonname, (u_long)clen);
1.385 djm 271: if (clen > 0)
272: *cname = '\0';
273: }
274: }
275: return res;
276: }
277:
1.470 djm 278: /* Returns non-zero if name can only be an address and not a hostname */
279: static int
280: is_addr_fast(const char *name)
281: {
282: return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
283: strspn(name, "0123456789.") == strlen(name));
284: }
285:
286: /* Returns non-zero if name represents a valid, single address */
287: static int
288: is_addr(const char *name)
289: {
290: char strport[NI_MAXSERV];
291: struct addrinfo hints, *res;
292:
293: if (is_addr_fast(name))
294: return 1;
295:
296: snprintf(strport, sizeof strport, "%u", default_ssh_port());
297: memset(&hints, 0, sizeof(hints));
298: hints.ai_family = options.address_family == -1 ?
299: AF_UNSPEC : options.address_family;
300: hints.ai_socktype = SOCK_STREAM;
301: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
302: if (getaddrinfo(name, strport, &hints, &res) != 0)
303: return 0;
304: if (res == NULL || res->ai_next != NULL) {
305: freeaddrinfo(res);
306: return 0;
307: }
308: freeaddrinfo(res);
309: return 1;
310: }
311:
1.385 djm 312: /*
1.413 djm 313: * Attempt to resolve a numeric host address / port to a single address.
314: * Returns a canonical address string.
315: * Returns NULL on failure.
316: * NB. this function must operate with a options having undefined members.
317: */
318: static struct addrinfo *
319: resolve_addr(const char *name, int port, char *caddr, size_t clen)
320: {
321: char addr[NI_MAXHOST], strport[NI_MAXSERV];
322: struct addrinfo hints, *res;
323: int gaierr;
324:
325: if (port <= 0)
326: port = default_ssh_port();
327: snprintf(strport, sizeof strport, "%u", port);
328: memset(&hints, 0, sizeof(hints));
329: hints.ai_family = options.address_family == -1 ?
330: AF_UNSPEC : options.address_family;
331: hints.ai_socktype = SOCK_STREAM;
332: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
333: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
1.540 djm 334: debug2_f("could not resolve name %.100s as address: %s",
335: name, ssh_gai_strerror(gaierr));
1.413 djm 336: return NULL;
337: }
338: if (res == NULL) {
1.540 djm 339: debug_f("getaddrinfo %.100s returned no addresses", name);
1.413 djm 340: return NULL;
341: }
342: if (res->ai_next != NULL) {
1.540 djm 343: debug_f("getaddrinfo %.100s returned multiple addresses", name);
1.413 djm 344: goto fail;
345: }
346: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
347: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
1.540 djm 348: debug_f("Could not format address for name %.100s: %s",
349: name, ssh_gai_strerror(gaierr));
1.413 djm 350: goto fail;
351: }
352: if (strlcpy(caddr, addr, clen) >= clen) {
1.540 djm 353: error_f("host \"%s\" addr \"%s\" too long (max %lu)",
354: name, addr, (u_long)clen);
1.413 djm 355: if (clen > 0)
356: *caddr = '\0';
357: fail:
358: freeaddrinfo(res);
359: return NULL;
360: }
361: return res;
362: }
363:
364: /*
1.385 djm 365: * Check whether the cname is a permitted replacement for the hostname
366: * and perform the replacement if it is.
1.400 djm 367: * NB. this function must operate with a options having undefined members.
1.385 djm 368: */
369: static int
1.443 djm 370: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 371: {
372: int i;
373: struct allowed_cname *rule;
374:
1.568 djm 375: if (*cname == '\0' || !config_has_permitted_cnames(&options) ||
1.385 djm 376: strcmp(*namep, cname) == 0)
377: return 0;
1.386 djm 378: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 379: return 0;
380: /*
1.386 djm 381: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 382: * a proxy or jump host unless the user specifically requests so.
1.385 djm 383: */
1.443 djm 384: if (!direct &&
1.386 djm 385: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 386: return 0;
1.540 djm 387: debug3_f("check \"%s\" CNAME \"%s\"", *namep, cname);
1.385 djm 388: for (i = 0; i < options.num_permitted_cnames; i++) {
389: rule = options.permitted_cnames + i;
1.418 djm 390: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
391: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 392: continue;
1.386 djm 393: verbose("Canonicalized DNS aliased hostname "
1.385 djm 394: "\"%s\" => \"%s\"", *namep, cname);
395: free(*namep);
396: *namep = xstrdup(cname);
397: return 1;
398: }
399: return 0;
400: }
401:
402: /*
403: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 404: * canonicalization rules. Returns the address list for the host or NULL
405: * if no name was found after canonicalization.
1.400 djm 406: * NB. this function must operate with a options having undefined members.
1.385 djm 407: */
408: static struct addrinfo *
1.400 djm 409: resolve_canonicalize(char **hostp, int port)
1.385 djm 410: {
1.443 djm 411: int i, direct, ndots;
1.413 djm 412: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 413: struct addrinfo *addrs;
414:
415: /*
1.470 djm 416: * Attempt to canonicalise addresses, regardless of
417: * whether hostname canonicalisation was requested
1.385 djm 418: */
1.413 djm 419: if ((addrs = resolve_addr(*hostp, port,
420: newname, sizeof(newname))) != NULL) {
1.540 djm 421: debug2_f("hostname %.100s is address", *hostp);
1.413 djm 422: if (strcasecmp(*hostp, newname) != 0) {
1.540 djm 423: debug2_f("canonicalised address \"%s\" => \"%s\"",
424: *hostp, newname);
1.413 djm 425: free(*hostp);
426: *hostp = xstrdup(newname);
427: }
428: return addrs;
429: }
430:
1.470 djm 431: /*
432: * If this looks like an address but didn't parse as one, it might
433: * be an address with an invalid interface scope. Skip further
434: * attempts at canonicalisation.
435: */
436: if (is_addr_fast(*hostp)) {
1.540 djm 437: debug_f("hostname %.100s is an unrecognised address", *hostp);
1.470 djm 438: return NULL;
439: }
440:
441: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
442: return NULL;
443:
444: /*
445: * Don't attempt to canonicalize names that will be interpreted by
446: * a proxy unless the user specifically requests so.
447: */
448: direct = option_clear_or_none(options.proxy_command) &&
1.588 djm 449: option_clear_or_none(options.jump_host);
1.470 djm 450: if (!direct &&
451: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
452: return NULL;
453:
1.428 djm 454: /* If domain name is anchored, then resolve it now */
455: if ((*hostp)[strlen(*hostp) - 1] == '.') {
1.540 djm 456: debug3_f("name is fully qualified");
1.428 djm 457: fullhost = xstrdup(*hostp);
458: if ((addrs = resolve_host(fullhost, port, 0,
459: newname, sizeof(newname))) != NULL)
460: goto found;
461: free(fullhost);
462: goto notfound;
463: }
464:
1.387 djm 465: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 466: ndots = 0;
467: for (cp = *hostp; *cp != '\0'; cp++) {
468: if (*cp == '.')
469: ndots++;
470: }
1.386 djm 471: if (ndots > options.canonicalize_max_dots) {
1.540 djm 472: debug3_f("not canonicalizing hostname \"%s\" (max dots %d)",
473: *hostp, options.canonicalize_max_dots);
1.385 djm 474: return NULL;
475: }
476: /* Attempt each supplied suffix */
477: for (i = 0; i < options.num_canonical_domains; i++) {
1.559 djm 478: if (strcasecmp(options.canonical_domains[i], "none") == 0)
479: break;
1.385 djm 480: xasprintf(&fullhost, "%s.%s.", *hostp,
481: options.canonical_domains[i]);
1.540 djm 482: debug3_f("attempting \"%s\" => \"%s\"", *hostp, fullhost);
1.400 djm 483: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 484: newname, sizeof(newname))) == NULL) {
1.385 djm 485: free(fullhost);
486: continue;
487: }
1.428 djm 488: found:
1.385 djm 489: /* Remove trailing '.' */
490: fullhost[strlen(fullhost) - 1] = '\0';
491: /* Follow CNAME if requested */
1.443 djm 492: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 493: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 494: *hostp, fullhost);
495: }
496: free(*hostp);
497: *hostp = fullhost;
498: return addrs;
499: }
1.428 djm 500: notfound:
1.386 djm 501: if (!options.canonicalize_fallback_local)
1.400 djm 502: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
1.540 djm 503: debug2_f("host %s not found in any suffix", *hostp);
1.385 djm 504: return NULL;
505: }
506:
1.32 deraadt 507: /*
1.576 djm 508: * Check the result of hostkey loading, ignoring some errors and either
509: * discarding the key or fatal()ing for others.
1.483 markus 510: */
511: static void
1.576 djm 512: check_load(int r, struct sshkey **k, const char *path, const char *message)
1.483 markus 513: {
514: switch (r) {
515: case 0:
1.576 djm 516: /* Check RSA keys size and discard if undersized */
517: if (k != NULL && *k != NULL &&
518: (r = sshkey_check_rsa_length(*k,
519: options.required_rsa_size)) != 0) {
520: error_r(r, "load %s \"%s\"", message, path);
521: free(*k);
522: *k = NULL;
523: }
1.483 markus 524: break;
525: case SSH_ERR_INTERNAL_ERROR:
526: case SSH_ERR_ALLOC_FAIL:
1.540 djm 527: fatal_r(r, "load %s \"%s\"", message, path);
1.483 markus 528: case SSH_ERR_SYSTEM_ERROR:
529: /* Ignore missing files */
530: if (errno == ENOENT)
531: break;
532: /* FALLTHROUGH */
533: default:
1.540 djm 534: error_r(r, "load %s \"%s\"", message, path);
1.483 markus 535: break;
536: }
537: }
538:
539: /*
1.400 djm 540: * Read per-user configuration file. Ignore the system wide config
541: * file if the user specifies a config file on the command line.
542: */
543: static void
1.496 djm 544: process_config_files(const char *host_name, struct passwd *pw, int final_pass,
545: int *want_final_pass)
1.400 djm 546: {
1.414 deraadt 547: char buf[PATH_MAX];
1.400 djm 548: int r;
549:
550: if (config != NULL) {
551: if (strcasecmp(config, "none") != 0 &&
1.466 djm 552: !read_config_file(config, pw, host, host_name, &options,
1.496 djm 553: SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0),
554: want_final_pass))
1.400 djm 555: fatal("Can't open user config file %.100s: "
556: "%.100s", config, strerror(errno));
557: } else {
558: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
559: _PATH_SSH_USER_CONFFILE);
560: if (r > 0 && (size_t)r < sizeof(buf))
1.466 djm 561: (void)read_config_file(buf, pw, host, host_name,
1.408 djm 562: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
1.496 djm 563: (final_pass ? SSHCONF_FINAL : 0), want_final_pass);
1.400 djm 564:
565: /* Read systemwide configuration file after user config. */
1.408 djm 566: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
1.466 djm 567: host, host_name, &options,
1.496 djm 568: final_pass ? SSHCONF_FINAL : 0, want_final_pass);
1.408 djm 569: }
570: }
571:
572: /* Rewrite the port number in an addrinfo list of addresses */
573: static void
574: set_addrinfo_port(struct addrinfo *addrs, int port)
575: {
576: struct addrinfo *addr;
577:
578: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
579: switch (addr->ai_family) {
580: case AF_INET:
581: ((struct sockaddr_in *)addr->ai_addr)->
582: sin_port = htons(port);
583: break;
584: case AF_INET6:
585: ((struct sockaddr_in6 *)addr->ai_addr)->
586: sin6_port = htons(port);
587: break;
588: }
1.400 djm 589: }
590: }
591:
1.544 djm 592: static void
593: ssh_conn_info_free(struct ssh_conn_info *cinfo)
594: {
595: if (cinfo == NULL)
596: return;
597: free(cinfo->conn_hash_hex);
598: free(cinfo->shorthost);
599: free(cinfo->uidstr);
600: free(cinfo->keyalias);
601: free(cinfo->thishost);
602: free(cinfo->host_arg);
603: free(cinfo->portstr);
604: free(cinfo->remhost);
605: free(cinfo->remuser);
606: free(cinfo->homedir);
607: free(cinfo->locuser);
608: free(cinfo);
609: }
610:
1.400 djm 611: /*
1.32 deraadt 612: * Main program for the ssh client.
613: */
1.2 provos 614: int
615: main(int ac, char **av)
1.1 deraadt 616: {
1.437 djm 617: struct ssh *ssh = NULL;
1.462 djm 618: int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
1.496 djm 619: int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
1.583 dtucker 620: char *p, *cp, *line, *argv0, *logfile;
1.544 djm 621: char cname[NI_MAXHOST], thishost[NI_MAXHOST];
1.31 markus 622: struct stat st;
1.98 markus 623: struct passwd *pw;
1.144 stevesk 624: extern int optind, optreset;
625: extern char *optarg;
1.406 millert 626: struct Forward fwd;
1.385 djm 627: struct addrinfo *addrs = NULL;
1.513 dtucker 628: size_t n, len;
1.532 dtucker 629: u_int j;
1.544 djm 630: struct ssh_conn_info *cinfo = NULL;
1.250 djm 631:
632: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
633: sanitise_stdfd();
1.31 markus 634:
1.33 markus 635: /*
1.346 djm 636: * Discard other fds that are hanging around. These can cause problem
637: * with backgrounded ssh processes started by ControlPersist.
638: */
639: closefrom(STDERR_FILENO + 1);
640:
1.487 dtucker 641: if (getuid() != geteuid())
642: fatal("ssh setuid not supported.");
643: if (getgid() != getegid())
644: fatal("ssh setgid not supported.");
1.184 stevesk 645:
1.107 markus 646: /* Get user data. */
1.490 dtucker 647: pw = getpwuid(getuid());
1.107 markus 648: if (!pw) {
1.490 dtucker 649: logit("No user exists for uid %lu", (u_long)getuid());
1.257 dtucker 650: exit(255);
1.107 markus 651: }
652: /* Take a copy of the returned structure. */
653: pw = pwcopy(pw);
1.31 markus 654:
1.33 markus 655: /*
656: * Set our umask to something reasonable, as some files are created
657: * with the default umask. This will make them world-readable but
658: * writable only by the owner, which is ok for all files for which we
659: * don't set the modes explicitly.
660: */
1.577 djm 661: umask(022 | umask(077));
1.445 djm 662:
663: setlocale(LC_CTYPE, "");
1.31 markus 664:
1.316 djm 665: /*
666: * Initialize option structure to indicate that no values have been
667: * set.
668: */
1.31 markus 669: initialize_options(&options);
670:
1.463 djm 671: /*
672: * Prepare main ssh transport/connection structures
673: */
674: if ((ssh = ssh_alloc_session_state()) == NULL)
675: fatal("Couldn't allocate session state");
676: channel_init_channels(ssh);
677:
1.31 markus 678: /* Parse command-line arguments. */
679: host = NULL;
1.320 djm 680: use_syslog = 0;
1.375 dtucker 681: logfile = NULL;
1.325 markus 682: argv0 = av[0];
1.31 markus 683:
1.266 djm 684: again:
1.316 djm 685: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.591 djm 686: "AB:CD:E:F:GI:J:KL:MNO:P:Q:R:S:TVw:W:XYy")) != -1) { /* HUZdhjruz */
1.31 markus 687: switch (opt) {
1.91 jakob 688: case '1':
1.454 djm 689: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 690: break;
1.47 markus 691: case '2':
1.454 djm 692: /* Ignored */
1.47 markus 693: break;
1.37 markus 694: case '4':
1.196 djm 695: options.address_family = AF_INET;
1.37 markus 696: break;
697: case '6':
1.196 djm 698: options.address_family = AF_INET6;
1.37 markus 699: break;
1.31 markus 700: case 'n':
1.563 djm 701: options.stdin_null = 1;
1.31 markus 702: break;
703: case 'f':
1.564 djm 704: options.fork_after_authentication = 1;
1.563 djm 705: options.stdin_null = 1;
1.31 markus 706: break;
707: case 'x':
708: options.forward_x11 = 0;
709: break;
710: case 'X':
711: options.forward_x11 = 1;
712: break;
1.320 djm 713: case 'y':
714: use_syslog = 1;
715: break;
1.375 dtucker 716: case 'E':
1.422 dtucker 717: logfile = optarg;
1.375 dtucker 718: break;
1.408 djm 719: case 'G':
720: config_test = 1;
721: break;
1.202 markus 722: case 'Y':
723: options.forward_x11 = 1;
724: options.forward_x11_trusted = 1;
725: break;
1.31 markus 726: case 'g':
1.406 millert 727: options.fwd_opts.gateway_ports = 1;
1.31 markus 728: break;
1.229 djm 729: case 'O':
1.441 dtucker 730: if (options.stdio_forward_host != NULL)
1.332 djm 731: fatal("Cannot specify multiplexing "
732: "command with -W");
733: else if (muxclient_command != 0)
734: fatal("Multiplexing command already specified");
1.229 djm 735: if (strcmp(optarg, "check") == 0)
1.312 djm 736: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 737: else if (strcmp(optarg, "forward") == 0)
738: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 739: else if (strcmp(optarg, "exit") == 0)
1.312 djm 740: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 741: else if (strcmp(optarg, "stop") == 0)
742: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 743: else if (strcmp(optarg, "cancel") == 0)
744: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 745: else if (strcmp(optarg, "proxy") == 0)
746: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 747: else
748: fatal("Invalid multiplex command.");
749: break;
1.591 djm 750: case 'P':
751: if (options.tag == NULL)
752: options.tag = xstrdup(optarg);
1.376 djm 753: break;
1.394 deraadt 754: case 'Q':
1.376 djm 755: cp = NULL;
1.519 dtucker 756: if (strcmp(optarg, "cipher") == 0 ||
757: strcasecmp(optarg, "Ciphers") == 0)
1.393 djm 758: cp = cipher_alg_list('\n', 0);
1.394 deraadt 759: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 760: cp = cipher_alg_list('\n', 1);
1.519 dtucker 761: else if (strcmp(optarg, "mac") == 0 ||
762: strcasecmp(optarg, "MACs") == 0)
1.392 dtucker 763: cp = mac_alg_list('\n');
1.519 dtucker 764: else if (strcmp(optarg, "kex") == 0 ||
765: strcasecmp(optarg, "KexAlgorithms") == 0)
1.392 dtucker 766: cp = kex_alg_list('\n');
1.394 deraadt 767: else if (strcmp(optarg, "key") == 0)
1.451 djm 768: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 769: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 770: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 771: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 772: cp = sshkey_alg_list(0, 1, 0, '\n');
1.589 djm 773: else if (strcmp(optarg, "key-ca-sign") == 0 ||
774: strcasecmp(optarg, "CASignatureAlgorithms") == 0)
775: cp = sshkey_alg_list(0, 1, 1, '\n');
1.519 dtucker 776: else if (strcmp(optarg, "key-sig") == 0 ||
1.547 dtucker 777: strcasecmp(optarg, "PubkeyAcceptedKeyTypes") == 0 || /* deprecated name */
778: strcasecmp(optarg, "PubkeyAcceptedAlgorithms") == 0 ||
1.519 dtucker 779: strcasecmp(optarg, "HostKeyAlgorithms") == 0 ||
1.548 dtucker 780: strcasecmp(optarg, "HostbasedKeyTypes") == 0 || /* deprecated name */
781: strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 0 || /* deprecated name */
782: strcasecmp(optarg, "HostbasedAcceptedAlgorithms") == 0)
1.519 dtucker 783: cp = sshkey_alg_list(0, 0, 1, '\n');
1.491 djm 784: else if (strcmp(optarg, "sig") == 0)
1.492 djm 785: cp = sshkey_alg_list(0, 1, 1, '\n');
1.491 djm 786: else if (strcmp(optarg, "protocol-version") == 0)
1.416 djm 787: cp = xstrdup("2");
1.513 dtucker 788: else if (strcmp(optarg, "compression") == 0) {
789: cp = xstrdup(compression_alg_list(0));
790: len = strlen(cp);
791: for (n = 0; n < len; n++)
792: if (cp[n] == ',')
793: cp[n] = '\n';
794: } else if (strcmp(optarg, "help") == 0) {
1.491 djm 795: cp = xstrdup(
1.513 dtucker 796: "cipher\ncipher-auth\ncompression\nkex\n"
1.519 dtucker 797: "key\nkey-cert\nkey-plain\nkey-sig\nmac\n"
1.491 djm 798: "protocol-version\nsig");
1.416 djm 799: }
1.376 djm 800: if (cp == NULL)
801: fatal("Unsupported query \"%s\"", optarg);
802: printf("%s\n", cp);
803: free(cp);
804: exit(0);
1.31 markus 805: break;
806: case 'a':
807: options.forward_agent = 0;
1.53 markus 808: break;
809: case 'A':
810: options.forward_agent = 1;
1.31 markus 811: break;
812: case 'k':
1.204 dtucker 813: options.gss_deleg_creds = 0;
1.297 djm 814: break;
815: case 'K':
816: options.gss_authentication = 1;
817: options.gss_deleg_creds = 1;
1.31 markus 818: break;
819: case 'i':
1.490 dtucker 820: p = tilde_expand_filename(optarg, getuid());
1.505 deraadt 821: if (stat(p, &st) == -1)
1.128 fgsch 822: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 823: "not accessible: %s.\n", p,
1.231 otto 824: strerror(errno));
1.429 dtucker 825: else
826: add_identity_file(&options, NULL, p, 1);
827: free(p);
1.31 markus 828: break;
1.127 markus 829: case 'I':
1.333 markus 830: #ifdef ENABLE_PKCS11
1.422 dtucker 831: free(options.pkcs11_provider);
1.333 markus 832: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 833: #else
1.333 markus 834: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 835: #endif
1.127 markus 836: break;
1.443 djm 837: case 'J':
1.504 djm 838: if (options.jump_host != NULL) {
839: fatal("Only a single -J option is permitted "
840: "(use commas to separate multiple "
841: "jump hops)");
842: }
1.443 djm 843: if (options.proxy_command != NULL)
844: fatal("Cannot specify -J with ProxyCommand");
845: if (parse_jump(optarg, &options, 1) == -1)
846: fatal("Invalid -J argument");
847: options.proxy_command = xstrdup("none");
848: break;
1.31 markus 849: case 't':
1.359 djm 850: if (options.request_tty == REQUEST_TTY_YES)
851: options.request_tty = REQUEST_TTY_FORCE;
852: else
853: options.request_tty = REQUEST_TTY_YES;
1.31 markus 854: break;
855: case 'v':
1.197 markus 856: if (debug_flag == 0) {
1.66 markus 857: debug_flag = 1;
858: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 859: } else {
1.443 djm 860: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
861: debug_flag++;
1.197 markus 862: options.log_level++;
1.443 djm 863: }
1.197 markus 864: }
1.375 dtucker 865: break;
1.31 markus 866: case 'V':
1.209 markus 867: fprintf(stderr, "%s, %s\n",
1.541 dtucker 868: SSH_VERSION, SSH_OPENSSL_VERSION);
1.584 millert 869: exit(0);
1.31 markus 870: break;
1.255 reyk 871: case 'w':
1.256 reyk 872: if (options.tun_open == -1)
873: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 874: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 875: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 876: fprintf(stderr,
877: "Bad tun device '%s'\n", optarg);
1.257 dtucker 878: exit(255);
1.255 reyk 879: }
880: break;
1.331 dtucker 881: case 'W':
1.441 dtucker 882: if (options.stdio_forward_host != NULL)
1.332 djm 883: fatal("stdio forward already specified");
884: if (muxclient_command != 0)
885: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 886: if (parse_forward(&fwd, optarg, 1, 0)) {
1.590 dlg 887: options.stdio_forward_host =
888: fwd.listen_port == PORT_STREAMLOCAL ?
889: fwd.listen_path : fwd.listen_host;
1.441 dtucker 890: options.stdio_forward_port = fwd.listen_port;
1.378 djm 891: free(fwd.connect_host);
1.331 dtucker 892: } else {
893: fprintf(stderr,
894: "Bad stdio forwarding specification '%s'\n",
895: optarg);
896: exit(255);
897: }
1.359 djm 898: options.request_tty = REQUEST_TTY_NO;
1.560 djm 899: options.session_type = SESSION_TYPE_NONE;
1.331 dtucker 900: break;
1.31 markus 901: case 'q':
902: options.log_level = SYSLOG_LEVEL_QUIET;
903: break;
904: case 'e':
905: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 906: (u_char) optarg[1] >= 64 &&
907: (u_char) optarg[1] < 128)
1.78 markus 908: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 909: else if (strlen(optarg) == 1)
1.78 markus 910: options.escape_char = (u_char) optarg[0];
1.31 markus 911: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 912: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 913: else {
1.128 fgsch 914: fprintf(stderr, "Bad escape character '%s'.\n",
915: optarg);
1.257 dtucker 916: exit(255);
1.31 markus 917: }
918: break;
919: case 'c':
1.506 naddy 920: if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
1.420 djm 921: optarg + 1 : optarg)) {
922: fprintf(stderr, "Unknown cipher type '%s'\n",
923: optarg);
924: exit(255);
1.95 markus 925: }
1.456 djm 926: free(options.ciphers);
927: options.ciphers = xstrdup(optarg);
1.95 markus 928: break;
929: case 'm':
1.422 dtucker 930: if (mac_valid(optarg)) {
931: free(options.macs);
1.95 markus 932: options.macs = xstrdup(optarg);
1.422 dtucker 933: } else {
1.128 fgsch 934: fprintf(stderr, "Unknown mac type '%s'\n",
935: optarg);
1.257 dtucker 936: exit(255);
1.31 markus 937: }
938: break;
1.214 djm 939: case 'M':
1.242 djm 940: if (options.control_master == SSHCTL_MASTER_YES)
941: options.control_master = SSHCTL_MASTER_ASK;
942: else
943: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 944: break;
1.31 markus 945: case 'p':
1.465 millert 946: if (options.port == -1) {
947: options.port = a2port(optarg);
948: if (options.port <= 0) {
949: fprintf(stderr, "Bad port '%s'\n",
950: optarg);
951: exit(255);
952: }
1.109 markus 953: }
1.31 markus 954: break;
955: case 'l':
1.465 millert 956: if (options.user == NULL)
957: options.user = optarg;
1.31 markus 958: break;
1.141 stevesk 959:
960: case 'L':
1.324 djm 961: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 962: add_local_forward(&options, &fwd);
963: else {
1.128 fgsch 964: fprintf(stderr,
1.232 djm 965: "Bad local forwarding specification '%s'\n",
1.128 fgsch 966: optarg);
1.257 dtucker 967: exit(255);
1.31 markus 968: }
1.232 djm 969: break;
970:
971: case 'R':
1.464 markus 972: if (parse_forward(&fwd, optarg, 0, 1) ||
973: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 974: add_remote_forward(&options, &fwd);
975: } else {
1.128 fgsch 976: fprintf(stderr,
1.232 djm 977: "Bad remote forwarding specification "
978: "'%s'\n", optarg);
1.257 dtucker 979: exit(255);
1.31 markus 980: }
981: break;
1.108 markus 982:
983: case 'D':
1.324 djm 984: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 985: add_local_forward(&options, &fwd);
1.232 djm 986: } else {
1.322 stevesk 987: fprintf(stderr,
988: "Bad dynamic forwarding specification "
989: "'%s'\n", optarg);
1.257 dtucker 990: exit(255);
1.109 markus 991: }
1.108 markus 992: break;
993:
1.31 markus 994: case 'C':
1.513 dtucker 995: #ifdef WITH_ZLIB
1.31 markus 996: options.compression = 1;
1.513 dtucker 997: #else
998: error("Compression not supported, disabling.");
999: #endif
1.31 markus 1000: break;
1.45 markus 1001: case 'N':
1.560 djm 1002: if (options.session_type != -1 &&
1003: options.session_type != SESSION_TYPE_NONE)
1004: fatal("Cannot specify -N with -s/SessionType");
1005: options.session_type = SESSION_TYPE_NONE;
1.359 djm 1006: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1007: break;
1008: case 'T':
1.359 djm 1009: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1010: break;
1.31 markus 1011: case 'o':
1.205 markus 1012: line = xstrdup(optarg);
1.408 djm 1013: if (process_config_line(&options, pw,
1014: host ? host : "", host ? host : "", line,
1015: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 1016: exit(255);
1.378 djm 1017: free(line);
1.31 markus 1018: break;
1.85 djm 1019: case 's':
1.560 djm 1020: if (options.session_type != -1 &&
1021: options.session_type != SESSION_TYPE_SUBSYSTEM)
1022: fatal("Cannot specify -s with -N/SessionType");
1023: options.session_type = SESSION_TYPE_SUBSYSTEM;
1.117 markus 1024: break;
1.214 djm 1025: case 'S':
1.431 mmcc 1026: free(options.control_path);
1.214 djm 1027: options.control_path = xstrdup(optarg);
1028: break;
1.117 markus 1029: case 'b':
1030: options.bind_address = optarg;
1.474 djm 1031: break;
1032: case 'B':
1033: options.bind_interface = optarg;
1.85 djm 1034: break;
1.139 markus 1035: case 'F':
1036: config = optarg;
1037: break;
1.31 markus 1038: default:
1039: usage();
1.1 deraadt 1040: }
1.31 markus 1041: }
1042:
1.462 djm 1043: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
1044: opt_terminated = 1;
1045:
1.128 fgsch 1046: ac -= optind;
1047: av += optind;
1048:
1.329 guenther 1049: if (ac > 0 && !host) {
1.465 millert 1050: int tport;
1051: char *tuser;
1052: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
1053: case -1:
1054: usage();
1055: break;
1056: case 0:
1057: if (options.user == NULL) {
1058: options.user = tuser;
1059: tuser = NULL;
1060: }
1061: free(tuser);
1062: if (options.port == -1 && tport != -1)
1063: options.port = tport;
1064: break;
1065: default:
1.128 fgsch 1066: p = xstrdup(*av);
1.188 markus 1067: cp = strrchr(p, '@');
1.465 millert 1068: if (cp != NULL) {
1069: if (cp == p)
1070: usage();
1071: if (options.user == NULL) {
1072: options.user = p;
1073: p = NULL;
1074: }
1075: *cp++ = '\0';
1076: host = xstrdup(cp);
1077: free(p);
1078: } else
1079: host = p;
1080: break;
1081: }
1.462 djm 1082: if (ac > 1 && !opt_terminated) {
1.189 millert 1083: optind = optreset = 1;
1.128 fgsch 1084: goto again;
1085: }
1.189 millert 1086: ac--, av++;
1.128 fgsch 1087: }
1088:
1.31 markus 1089: /* Check that we got a host name. */
1090: if (!host)
1091: usage();
1092:
1.583 dtucker 1093: options.host_arg = xstrdup(host);
1.385 djm 1094:
1.402 markus 1095: #ifdef WITH_OPENSSL
1.350 djm 1096: OpenSSL_add_all_algorithms();
1.72 markus 1097: ERR_load_crypto_strings();
1.402 markus 1098: #endif
1.31 markus 1099:
1100: /* Initialize the command to execute on remote host. */
1.482 markus 1101: if ((command = sshbuf_new()) == NULL)
1102: fatal("sshbuf_new failed");
1.1 deraadt 1103:
1.33 markus 1104: /*
1105: * Save the command to execute on the remote host in a buffer. There
1106: * is no limit on the length of the command, except by the maximum
1107: * packet size. Also sets the tty flag if there is no command.
1108: */
1.128 fgsch 1109: if (!ac) {
1.31 markus 1110: /* No command specified - execute shell on a tty. */
1.560 djm 1111: if (options.session_type == SESSION_TYPE_SUBSYSTEM) {
1.128 fgsch 1112: fprintf(stderr,
1113: "You must specify a subsystem to invoke.\n");
1.85 djm 1114: usage();
1115: }
1.31 markus 1116: } else {
1.128 fgsch 1117: /* A command has been specified. Store it into the buffer. */
1118: for (i = 0; i < ac; i++) {
1.482 markus 1119: if ((r = sshbuf_putf(command, "%s%s",
1120: i ? " " : "", av[i])) != 0)
1.540 djm 1121: fatal_fr(r, "buffer error");
1.31 markus 1122: }
1123: }
1124:
1.575 djm 1125: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1126:
1.101 markus 1127: /*
1128: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1129: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1130: */
1.375 dtucker 1131: if (use_syslog && logfile != NULL)
1132: fatal("Can't specify both -y and -E");
1.422 dtucker 1133: if (logfile != NULL)
1.375 dtucker 1134: log_redirect_stderr_to(logfile);
1.325 markus 1135: log_init(argv0,
1.468 djm 1136: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1137: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1138: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1139: SYSLOG_FACILITY_USER : options.log_facility,
1140: !use_syslog);
1.375 dtucker 1141:
1142: if (debug_flag)
1.541 dtucker 1143: logit("%s, %s", SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 1144:
1.400 djm 1145: /* Parse the configuration files */
1.583 dtucker 1146: process_config_files(options.host_arg, pw, 0, &want_final_pass);
1.496 djm 1147: if (want_final_pass)
1148: debug("configuration requests final Match pass");
1.400 djm 1149:
1150: /* Hostname canonicalisation needs a few options filled. */
1151: fill_default_options_for_canonicalization(&options);
1152:
1153: /* If the user has replaced the hostname then take it into use now */
1154: if (options.hostname != NULL) {
1155: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1156: cp = percent_expand(options.hostname,
1157: "h", host, (char *)NULL);
1158: free(host);
1159: host = cp;
1.408 djm 1160: free(options.hostname);
1161: options.hostname = xstrdup(host);
1.400 djm 1162: }
1163:
1.470 djm 1164: /* Don't lowercase addresses, they will be explicitly canonicalised */
1165: if ((was_addr = is_addr(host)) == 0)
1166: lowercase(host);
1167:
1168: /*
1169: * Try to canonicalize if requested by configuration or the
1170: * hostname is an address.
1171: */
1172: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1173: addrs = resolve_canonicalize(&host, options.port);
1174:
1.139 markus 1175: /*
1.401 djm 1176: * If CanonicalizePermittedCNAMEs have been specified but
1177: * other canonicalization did not happen (by not being requested
1178: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1179: * as a result of CNAME following.
1.401 djm 1180: *
1181: * Try to resolve the bare hostname name using the system resolver's
1182: * usual search rules and then apply the CNAME follow rules.
1183: *
1184: * Skip the lookup if a ProxyCommand is being used unless the user
1185: * has specifically requested canonicalisation for this case via
1186: * CanonicalizeHostname=always
1.139 markus 1187: */
1.443 djm 1188: direct = option_clear_or_none(options.proxy_command) &&
1.588 djm 1189: option_clear_or_none(options.jump_host);
1.568 djm 1190: if (addrs == NULL && config_has_permitted_cnames(&options) && (direct ||
1.443 djm 1191: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1192: if ((addrs = resolve_host(host, options.port,
1.493 djm 1193: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1194: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1195: if (direct)
1.403 djm 1196: cleanup_exit(255); /* logged in resolve_host */
1197: } else
1.443 djm 1198: check_follow_cname(direct, &host, cname);
1.400 djm 1199: }
1.139 markus 1200:
1.400 djm 1201: /*
1.408 djm 1202: * If canonicalisation is enabled then re-parse the configuration
1203: * files as new stanzas may match.
1.400 djm 1204: */
1.496 djm 1205: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1206: debug("hostname canonicalisation enabled, "
1207: "will re-parse configuration");
1208: want_final_pass = 1;
1209: }
1210:
1211: if (want_final_pass) {
1212: debug("re-parsing configuration");
1.408 djm 1213: free(options.hostname);
1214: options.hostname = xstrdup(host);
1.583 dtucker 1215: process_config_files(options.host_arg, pw, 1, NULL);
1.408 djm 1216: /*
1217: * Address resolution happens early with canonicalisation
1218: * enabled and the port number may have changed since, so
1219: * reset it in address list
1220: */
1221: if (addrs != NULL && options.port > 0)
1222: set_addrinfo_port(addrs, options.port);
1.139 markus 1223: }
1.31 markus 1224:
1225: /* Fill configuration defaults. */
1.543 djm 1226: if (fill_default_options(&options) != 0)
1227: cleanup_exit(255);
1.443 djm 1228:
1.534 dtucker 1229: if (options.user == NULL)
1230: options.user = xstrdup(pw->pw_name);
1231:
1.443 djm 1232: /*
1233: * If ProxyJump option specified, then construct a ProxyCommand now.
1234: */
1235: if (options.jump_host != NULL) {
1236: char port_s[8];
1.534 dtucker 1237: const char *jumpuser = options.jump_user, *sshbin = argv0;
1.520 dtucker 1238: int port = options.port, jumpport = options.jump_port;
1239:
1240: if (port <= 0)
1241: port = default_ssh_port();
1242: if (jumpport <= 0)
1243: jumpport = default_ssh_port();
1.534 dtucker 1244: if (jumpuser == NULL)
1245: jumpuser = options.user;
1246: if (strcmp(options.jump_host, host) == 0 && port == jumpport &&
1247: strcmp(options.user, jumpuser) == 0)
1.520 dtucker 1248: fatal("jumphost loop via %s", options.jump_host);
1.478 djm 1249:
1250: /*
1251: * Try to use SSH indicated by argv[0], but fall back to
1252: * "ssh" if it appears unavailable.
1253: */
1254: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1255: sshbin = "ssh";
1.443 djm 1256:
1257: /* Consistency check */
1258: if (options.proxy_command != NULL)
1259: fatal("inconsistent options: ProxyCommand+ProxyJump");
1260: /* Never use FD passing for ProxyJump */
1261: options.proxy_use_fdpass = 0;
1262: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1263: xasprintf(&options.proxy_command,
1.478 djm 1264: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1265: sshbin,
1.443 djm 1266: /* Optional "-l user" argument if jump_user set */
1267: options.jump_user == NULL ? "" : " -l ",
1268: options.jump_user == NULL ? "" : options.jump_user,
1269: /* Optional "-p port" argument if jump_port set */
1270: options.jump_port <= 0 ? "" : " -p ",
1271: options.jump_port <= 0 ? "" : port_s,
1272: /* Optional additional jump hosts ",..." */
1273: options.jump_extra == NULL ? "" : " -J ",
1274: options.jump_extra == NULL ? "" : options.jump_extra,
1.571 jsg 1275: /* Optional "-F" argument if -F specified */
1.443 djm 1276: config == NULL ? "" : " -F ",
1277: config == NULL ? "" : config,
1278: /* Optional "-v" arguments if -v set */
1279: debug_flag ? " -" : "",
1280: debug_flag, "vvv",
1281: /* Mandatory hostname */
1282: options.jump_host);
1283: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1284: options.proxy_command);
1285: }
1.31 markus 1286:
1.400 djm 1287: if (options.port == 0)
1288: options.port = default_ssh_port();
1.463 djm 1289: channel_set_af(ssh, options.address_family);
1.196 djm 1290:
1.383 djm 1291: /* Tidy and check options */
1292: if (options.host_key_alias != NULL)
1293: lowercase(options.host_key_alias);
1294: if (options.proxy_command != NULL &&
1295: strcmp(options.proxy_command, "-") == 0 &&
1296: options.proxy_use_fdpass)
1297: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.516 markus 1298: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1299: if (options.control_persist && options.control_path != NULL) {
1300: debug("UpdateHostKeys=ask is incompatible with "
1301: "ControlPersist; disabling");
1302: options.update_hostkeys = 0;
1303: } else if (sshbuf_len(command) != 0 ||
1304: options.remote_command != NULL ||
1305: options.request_tty == REQUEST_TTY_NO) {
1306: debug("UpdateHostKeys=ask is incompatible with "
1307: "remote command execution; disabling");
1.517 djm 1308: options.update_hostkeys = 0;
1309: } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1310: /* no point logging anything; user won't see it */
1.516 markus 1311: options.update_hostkeys = 0;
1312: }
1.415 djm 1313: }
1.430 djm 1314: if (options.connection_attempts <= 0)
1315: fatal("Invalid number of ConnectionAttempts");
1316:
1.482 markus 1317: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1318: fatal("Cannot execute command-line and remote command.");
1319:
1320: /* Cannot fork to background if no command. */
1.564 djm 1321: if (options.fork_after_authentication && sshbuf_len(command) == 0 &&
1.562 djm 1322: options.remote_command == NULL &&
1323: options.session_type != SESSION_TYPE_NONE)
1.461 bluhm 1324: fatal("Cannot fork into background without a command "
1325: "to execute.");
1326:
1.31 markus 1327: /* reinit */
1.452 dtucker 1328: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.559 djm 1329: for (j = 0; j < options.num_log_verbose; j++) {
1330: if (strcasecmp(options.log_verbose[j], "none") == 0)
1331: break;
1.539 djm 1332: log_verbose_add(options.log_verbose[j]);
1.559 djm 1333: }
1.370 djm 1334:
1335: if (options.request_tty == REQUEST_TTY_YES ||
1336: options.request_tty == REQUEST_TTY_FORCE)
1337: tty_flag = 1;
1338:
1339: /* Allocate a tty by default if no command specified. */
1.482 markus 1340: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1341: tty_flag = options.request_tty != REQUEST_TTY_NO;
1342:
1343: /* Force no tty */
1.447 markus 1344: if (options.request_tty == REQUEST_TTY_NO ||
1.570 djm 1345: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY) ||
1346: options.session_type == SESSION_TYPE_NONE)
1.370 djm 1347: tty_flag = 0;
1348: /* Do not allocate a tty if stdin is not a tty. */
1.563 djm 1349: if ((!isatty(fileno(stdin)) || options.stdin_null) &&
1.370 djm 1350: options.request_tty != REQUEST_TTY_FORCE) {
1351: if (tty_flag)
1352: logit("Pseudo-terminal will not be allocated because "
1353: "stdin is not a terminal.");
1354: tty_flag = 0;
1355: }
1.343 djm 1356:
1.466 djm 1357: /* Set up strings used to percent_expand() arguments */
1.544 djm 1358: cinfo = xcalloc(1, sizeof(*cinfo));
1.358 djm 1359: if (gethostname(thishost, sizeof(thishost)) == -1)
1360: fatal("gethostname: %s", strerror(errno));
1.544 djm 1361: cinfo->thishost = xstrdup(thishost);
1362: thishost[strcspn(thishost, ".")] = '\0';
1363: cinfo->shorthost = xstrdup(thishost);
1364: xasprintf(&cinfo->portstr, "%d", options.port);
1365: xasprintf(&cinfo->uidstr, "%llu",
1.479 djm 1366: (unsigned long long)pw->pw_uid);
1.544 djm 1367: cinfo->keyalias = xstrdup(options.host_key_alias ?
1.583 dtucker 1368: options.host_key_alias : options.host_arg);
1.544 djm 1369: cinfo->conn_hash_hex = ssh_connection_hash(cinfo->thishost, host,
1370: cinfo->portstr, options.user);
1.583 dtucker 1371: cinfo->host_arg = xstrdup(options.host_arg);
1.544 djm 1372: cinfo->remhost = xstrdup(host);
1373: cinfo->remuser = xstrdup(options.user);
1374: cinfo->homedir = xstrdup(pw->pw_dir);
1375: cinfo->locuser = xstrdup(pw->pw_name);
1.405 djm 1376:
1.466 djm 1377: /*
1378: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1379: * after port-forwarding is set up, so it may pick up any local
1380: * tunnel interface name allocated.
1381: */
1.461 bluhm 1382: if (options.remote_command != NULL) {
1383: debug3("expanding RemoteCommand: %s", options.remote_command);
1384: cp = options.remote_command;
1.527 dtucker 1385: options.remote_command = default_client_percent_expand(cp,
1.544 djm 1386: cinfo);
1.461 bluhm 1387: debug3("expanded RemoteCommand: %s", options.remote_command);
1388: free(cp);
1.482 markus 1389: if ((r = sshbuf_put(command, options.remote_command,
1390: strlen(options.remote_command))) != 0)
1.540 djm 1391: fatal_fr(r, "buffer error");
1.304 dtucker 1392: }
1.31 markus 1393:
1.214 djm 1394: if (options.control_path != NULL) {
1.490 dtucker 1395: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1396: free(options.control_path);
1.528 dtucker 1397: options.control_path = default_client_percent_dollar_expand(cp,
1.544 djm 1398: cinfo);
1.378 djm 1399: free(cp);
1.214 djm 1400: }
1.408 djm 1401:
1.522 dtucker 1402: if (options.identity_agent != NULL) {
1403: p = tilde_expand_filename(options.identity_agent, getuid());
1.544 djm 1404: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1405: free(p);
1406: free(options.identity_agent);
1407: options.identity_agent = cp;
1.586 dtucker 1408: }
1409:
1410: if (options.revoked_host_keys != NULL) {
1411: p = tilde_expand_filename(options.revoked_host_keys, getuid());
1412: cp = default_client_percent_dollar_expand(p, cinfo);
1413: free(p);
1414: free(options.revoked_host_keys);
1415: options.revoked_host_keys = cp;
1.522 dtucker 1416: }
1417:
1418: if (options.forward_agent_sock_path != NULL) {
1419: p = tilde_expand_filename(options.forward_agent_sock_path,
1420: getuid());
1.544 djm 1421: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1422: free(p);
1423: free(options.forward_agent_sock_path);
1424: options.forward_agent_sock_path = cp;
1.552 djm 1425: if (stat(options.forward_agent_sock_path, &st) != 0) {
1426: error("Cannot forward agent socket path \"%s\": %s",
1427: options.forward_agent_sock_path, strerror(errno));
1428: if (options.exit_on_forward_failure)
1429: cleanup_exit(255);
1430: }
1.532 dtucker 1431: }
1432:
1.545 djm 1433: if (options.num_system_hostfiles > 0 &&
1434: strcasecmp(options.system_hostfiles[0], "none") == 0) {
1435: if (options.num_system_hostfiles > 1)
1436: fatal("Invalid GlobalKnownHostsFiles: \"none\" "
1437: "appears with other entries");
1438: free(options.system_hostfiles[0]);
1439: options.system_hostfiles[0] = NULL;
1440: options.num_system_hostfiles = 0;
1441: }
1442:
1443: if (options.num_user_hostfiles > 0 &&
1444: strcasecmp(options.user_hostfiles[0], "none") == 0) {
1445: if (options.num_user_hostfiles > 1)
1446: fatal("Invalid UserKnownHostsFiles: \"none\" "
1447: "appears with other entries");
1448: free(options.user_hostfiles[0]);
1449: options.user_hostfiles[0] = NULL;
1450: options.num_user_hostfiles = 0;
1451: }
1.532 dtucker 1452: for (j = 0; j < options.num_user_hostfiles; j++) {
1.545 djm 1453: if (options.user_hostfiles[j] == NULL)
1454: continue;
1455: cp = tilde_expand_filename(options.user_hostfiles[j], getuid());
1456: p = default_client_percent_dollar_expand(cp, cinfo);
1457: if (strcmp(options.user_hostfiles[j], p) != 0)
1458: debug3("expanded UserKnownHostsFile '%s' -> "
1459: "'%s'", options.user_hostfiles[j], p);
1460: free(options.user_hostfiles[j]);
1461: free(cp);
1462: options.user_hostfiles[j] = p;
1.522 dtucker 1463: }
1464:
1.527 dtucker 1465: for (i = 0; i < options.num_local_forwards; i++) {
1466: if (options.local_forwards[i].listen_path != NULL) {
1467: cp = options.local_forwards[i].listen_path;
1468: p = options.local_forwards[i].listen_path =
1.544 djm 1469: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1470: if (strcmp(cp, p) != 0)
1471: debug3("expanded LocalForward listen path "
1472: "'%s' -> '%s'", cp, p);
1473: free(cp);
1474: }
1475: if (options.local_forwards[i].connect_path != NULL) {
1476: cp = options.local_forwards[i].connect_path;
1477: p = options.local_forwards[i].connect_path =
1.544 djm 1478: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1479: if (strcmp(cp, p) != 0)
1480: debug3("expanded LocalForward connect path "
1481: "'%s' -> '%s'", cp, p);
1482: free(cp);
1483: }
1484: }
1485:
1486: for (i = 0; i < options.num_remote_forwards; i++) {
1487: if (options.remote_forwards[i].listen_path != NULL) {
1488: cp = options.remote_forwards[i].listen_path;
1489: p = options.remote_forwards[i].listen_path =
1.544 djm 1490: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1491: if (strcmp(cp, p) != 0)
1492: debug3("expanded RemoteForward listen path "
1493: "'%s' -> '%s'", cp, p);
1494: free(cp);
1495: }
1496: if (options.remote_forwards[i].connect_path != NULL) {
1497: cp = options.remote_forwards[i].connect_path;
1498: p = options.remote_forwards[i].connect_path =
1.544 djm 1499: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1500: if (strcmp(cp, p) != 0)
1501: debug3("expanded RemoteForward connect path "
1502: "'%s' -> '%s'", cp, p);
1503: free(cp);
1504: }
1505: }
1506:
1.408 djm 1507: if (config_test) {
1508: dump_client_config(&options, host);
1509: exit(0);
1.508 djm 1510: }
1511:
1512: /* Expand SecurityKeyProvider if it refers to an environment variable */
1513: if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1514: strlen(options.sk_provider) > 1) {
1515: if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1.518 naddy 1516: debug("Authenticator provider %s did not resolve; "
1.508 djm 1517: "disabling", options.sk_provider);
1518: free(options.sk_provider);
1519: options.sk_provider = NULL;
1520: } else {
1521: debug2("resolved SecurityKeyProvider %s => %s",
1522: options.sk_provider, cp);
1523: free(options.sk_provider);
1524: options.sk_provider = xstrdup(cp);
1525: }
1.408 djm 1526: }
1.405 djm 1527:
1.312 djm 1528: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1529: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1530: if (options.control_path != NULL) {
1531: int sock;
1532: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1533: ssh_packet_set_connection(ssh, sock, sock);
1.499 djm 1534: ssh_packet_set_mux(ssh);
1.447 markus 1535: goto skip_connect;
1536: }
1537: }
1.401 djm 1538:
1539: /*
1540: * If hostname canonicalisation was not enabled, then we may not
1541: * have yet resolved the hostname. Do so now.
1542: */
1543: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1544: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1545: if ((addrs = resolve_host(host, options.port, 1,
1546: cname, sizeof(cname))) == NULL)
1547: cleanup_exit(255); /* resolve_host logs the error */
1548: }
1.214 djm 1549:
1.542 dtucker 1550: if (options.connection_timeout >= INT_MAX/1000)
1551: timeout_ms = INT_MAX;
1552: else
1553: timeout_ms = options.connection_timeout * 1000;
1.303 djm 1554:
1.77 markus 1555: /* Open a connection to the remote host. */
1.583 dtucker 1556: if (ssh_connect(ssh, host, options.host_arg, addrs, &hostaddr,
1557: options.port, options.connection_attempts,
1.488 dtucker 1558: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1559: exit(255);
1.31 markus 1560:
1.391 djm 1561: if (addrs != NULL)
1562: freeaddrinfo(addrs);
1563:
1.499 djm 1564: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1565: options.server_alive_count_max);
1566:
1.303 djm 1567: if (timeout_ms > 0)
1568: debug3("timeout: %d ms remain after connect", timeout_ms);
1569:
1.33 markus 1570: /*
1.485 dtucker 1571: * If we successfully made the connection and we have hostbased auth
1572: * enabled, load the public keys so we can later use the ssh-keysign
1573: * helper to sign challenges.
1.33 markus 1574: */
1.112 markus 1575: sensitive_data.nkeys = 0;
1576: sensitive_data.keys = NULL;
1.457 djm 1577: if (options.hostbased_authentication) {
1.581 dtucker 1578: int loaded = 0;
1579:
1.486 dtucker 1580: sensitive_data.nkeys = 10;
1.274 deraadt 1581: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.578 jsg 1582: sizeof(*sensitive_data.keys));
1.483 markus 1583:
1584: /* XXX check errors? */
1.486 dtucker 1585: #define L_PUBKEY(p,o) do { \
1586: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1587: fatal_f("pubkey out of array bounds"); \
1.483 markus 1588: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.576 djm 1589: &(sensitive_data.keys[o]), p, "pubkey"); \
1.581 dtucker 1590: if (sensitive_data.keys[o] != NULL) { \
1.572 djm 1591: debug2("hostbased key %d: %s key from \"%s\"", o, \
1592: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.581 dtucker 1593: loaded++; \
1594: } \
1.486 dtucker 1595: } while (0)
1596: #define L_CERT(p,o) do { \
1597: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1598: fatal_f("cert out of array bounds"); \
1.576 djm 1599: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), \
1600: &(sensitive_data.keys[o]), p, "cert"); \
1.581 dtucker 1601: if (sensitive_data.keys[o] != NULL) { \
1.572 djm 1602: debug2("hostbased key %d: %s cert from \"%s\"", o, \
1603: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.581 dtucker 1604: loaded++; \
1605: } \
1.486 dtucker 1606: } while (0)
1.177 markus 1607:
1.485 dtucker 1608: if (options.hostbased_authentication == 1) {
1.486 dtucker 1609: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1610: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1611: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1612: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1613: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1614: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1615: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1616: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1617: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1618: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.581 dtucker 1619: if (loaded == 0)
1620: debug("HostbasedAuthentication enabled but no "
1621: "local public host keys could be loaded.");
1.173 markus 1622: }
1.367 djm 1623: }
1.31 markus 1624:
1.104 markus 1625: /* load options.identity_files */
1.544 djm 1626: load_public_identity_files(cinfo);
1.439 markus 1627:
1.476 djm 1628: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1629: if (options.identity_agent &&
1630: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1631: if (strcmp(options.identity_agent, "none") == 0) {
1632: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1633: } else {
1.522 dtucker 1634: cp = options.identity_agent;
1.528 dtucker 1635: /* legacy (limited) format */
1636: if (cp[0] == '$' && cp[1] != '{') {
1.494 djm 1637: if (!valid_env_name(cp + 1)) {
1638: fatal("Invalid IdentityAgent "
1639: "environment variable name %s", cp);
1640: }
1641: if ((p = getenv(cp + 1)) == NULL)
1642: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1643: else
1644: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1645: } else {
1646: /* identity_agent specifies a path directly */
1647: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1648: }
1.510 djm 1649: }
1650: }
1651:
1.522 dtucker 1652: if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1.526 djm 1653: cp = options.forward_agent_sock_path;
1.510 djm 1654: if (cp[0] == '$') {
1655: if (!valid_env_name(cp + 1)) {
1656: fatal("Invalid ForwardAgent environment variable name %s", cp);
1657: }
1658: if ((p = getenv(cp + 1)) != NULL)
1.566 dtucker 1659: forward_agent_sock_path = xstrdup(p);
1.510 djm 1660: else
1661: options.forward_agent = 0;
1662: free(cp);
1663: } else {
1664: forward_agent_sock_path = cp;
1.439 markus 1665: }
1666: }
1.104 markus 1667:
1668: /* Expand ~ in known host file names. */
1.361 djm 1669: tilde_expand_paths(options.system_hostfiles,
1670: options.num_system_hostfiles);
1671: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1672:
1.512 dtucker 1673: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1674:
1.316 djm 1675: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1676: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.546 djm 1677: options.port, pw, timeout_ms, cinfo);
1.31 markus 1678:
1.112 markus 1679: /* We no longer need the private host keys. Clear them now. */
1680: if (sensitive_data.nkeys != 0) {
1681: for (i = 0; i < sensitive_data.nkeys; i++) {
1682: if (sensitive_data.keys[i] != NULL) {
1683: /* Destroys contents safely */
1684: debug3("clear hostkey %d", i);
1.483 markus 1685: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1686: sensitive_data.keys[i] = NULL;
1687: }
1688: }
1.378 djm 1689: free(sensitive_data.keys);
1.134 markus 1690: }
1691: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1692: free(options.identity_files[i]);
1693: options.identity_files[i] = NULL;
1.134 markus 1694: if (options.identity_keys[i]) {
1.483 markus 1695: sshkey_free(options.identity_keys[i]);
1.134 markus 1696: options.identity_keys[i] = NULL;
1697: }
1.112 markus 1698: }
1.426 djm 1699: for (i = 0; i < options.num_certificate_files; i++) {
1700: free(options.certificate_files[i]);
1701: options.certificate_files[i] = NULL;
1702: }
1.553 djm 1703:
1704: #ifdef ENABLE_PKCS11
1705: (void)pkcs11_del_provider(options.pkcs11_provider);
1706: #endif
1.31 markus 1707:
1.447 markus 1708: skip_connect:
1.544 djm 1709: exit_status = ssh_session2(ssh, cinfo);
1710: ssh_conn_info_free(cinfo);
1.499 djm 1711: ssh_packet_close(ssh);
1.186 djm 1712:
1.312 djm 1713: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1714: unlink(options.control_path);
1715:
1.353 djm 1716: /* Kill ProxyCommand if it is running. */
1717: ssh_kill_proxy_command();
1.186 djm 1718:
1.45 markus 1719: return exit_status;
1720: }
1721:
1.344 djm 1722: static void
1723: control_persist_detach(void)
1724: {
1725: pid_t pid;
1726:
1.540 djm 1727: debug_f("backgrounding master process");
1.344 djm 1728:
1.473 djm 1729: /*
1730: * master (current process) into the background, and make the
1731: * foreground process a client of the backgrounded master.
1732: */
1.344 djm 1733: switch ((pid = fork())) {
1734: case -1:
1.540 djm 1735: fatal_f("fork: %s", strerror(errno));
1.344 djm 1736: case 0:
1737: /* Child: master process continues mainloop */
1.473 djm 1738: break;
1739: default:
1.593 djm 1740: /*
1741: * Parent: set up mux client to connect to backgrounded
1742: * master.
1743: */
1.540 djm 1744: debug2_f("background process is %ld", (long)pid);
1.563 djm 1745: options.stdin_null = ostdin_null_flag;
1.359 djm 1746: options.request_tty = orequest_tty;
1.344 djm 1747: tty_flag = otty_flag;
1.593 djm 1748: options.fork_after_authentication = ofork_after_authentication;
1.561 djm 1749: options.session_type = osession_type;
1.473 djm 1750: close(muxserver_sock);
1751: muxserver_sock = -1;
1.351 markus 1752: options.control_master = SSHCTL_MASTER_NO;
1.587 dtucker 1753: (void)muxclient(options.control_path);
1.344 djm 1754: /* muxclient() doesn't return on success. */
1.473 djm 1755: fatal("Failed to connect to new control master");
1756: }
1.537 djm 1757: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1758: error_f("stdfd_devnull failed");
1.381 djm 1759: daemon(1, 1);
1.362 djm 1760: setproctitle("%s [mux]", options.control_path);
1.344 djm 1761: }
1762:
1763: /* Do fork() after authentication. Used by "ssh -f" */
1764: static void
1765: fork_postauth(void)
1766: {
1767: if (need_controlpersist_detach)
1768: control_persist_detach();
1769: debug("forking to background");
1.564 djm 1770: options.fork_after_authentication = 0;
1.505 deraadt 1771: if (daemon(1, 1) == -1)
1.344 djm 1772: fatal("daemon() failed: %.200s", strerror(errno));
1.537 djm 1773: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1774: error_f("stdfd_devnull failed");
1.344 djm 1775: }
1776:
1.523 djm 1777: static void
1778: forwarding_success(void)
1779: {
1.524 djm 1780: if (forward_confirms_pending == -1)
1781: return;
1782: if (--forward_confirms_pending == 0) {
1.540 djm 1783: debug_f("all expected forwarding replies received");
1.564 djm 1784: if (options.fork_after_authentication)
1.523 djm 1785: fork_postauth();
1.524 djm 1786: } else {
1.540 djm 1787: debug2_f("%d expected forwarding replies remaining",
1788: forward_confirms_pending);
1.523 djm 1789: }
1790: }
1791:
1.315 djm 1792: /* Callback for remote forward global requests */
1793: static void
1.463 djm 1794: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1795: {
1.406 millert 1796: struct Forward *rfwd = (struct Forward *)ctxt;
1.499 djm 1797: u_int port;
1798: int r;
1.315 djm 1799:
1.324 djm 1800: /* XXX verbose() on failure? */
1.404 markus 1801: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1802: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1803: rfwd->listen_path ? rfwd->listen_path :
1804: rfwd->listen_host ? rfwd->listen_host : "",
1805: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1806: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1807: rfwd->connect_host, rfwd->connect_port);
1808: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1809: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1.499 djm 1810: if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1.540 djm 1811: fatal_fr(r, "parse packet");
1.499 djm 1812: if (port > 65535) {
1813: error("Invalid allocated port %u for remote "
1814: "forward to %s:%d", port,
1815: rfwd->connect_host, rfwd->connect_port);
1816: /* Ensure failure processing runs below */
1817: type = SSH2_MSG_REQUEST_FAILURE;
1818: channel_update_permission(ssh,
1819: rfwd->handle, -1);
1820: } else {
1821: rfwd->allocated_port = (int)port;
1822: logit("Allocated port %u for remote "
1823: "forward to %s:%d",
1.569 dtucker 1824: rfwd->allocated_port, rfwd->connect_path ?
1825: rfwd->connect_path : rfwd->connect_host,
1.499 djm 1826: rfwd->connect_port);
1827: channel_update_permission(ssh,
1828: rfwd->handle, rfwd->allocated_port);
1829: }
1.366 markus 1830: } else {
1.480 djm 1831: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1832: }
1.324 djm 1833: }
1.468 djm 1834:
1.315 djm 1835: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1836: if (options.exit_on_forward_failure) {
1837: if (rfwd->listen_path != NULL)
1838: fatal("Error: remote port forwarding failed "
1839: "for listen path %s", rfwd->listen_path);
1840: else
1841: fatal("Error: remote port forwarding failed "
1842: "for listen port %d", rfwd->listen_port);
1843: } else {
1844: if (rfwd->listen_path != NULL)
1845: logit("Warning: remote port forwarding failed "
1846: "for listen path %s", rfwd->listen_path);
1847: else
1848: logit("Warning: remote port forwarding failed "
1849: "for listen port %d", rfwd->listen_port);
1850: }
1.315 djm 1851: }
1.523 djm 1852: forwarding_success();
1.315 djm 1853: }
1854:
1.126 itojun 1855: static void
1.582 djm 1856: client_cleanup_stdio_fwd(struct ssh *ssh, int id, int force, void *arg)
1.331 dtucker 1857: {
1858: debug("stdio forwarding: done");
1859: cleanup_exit(0);
1860: }
1861:
1.368 djm 1862: static void
1.463 djm 1863: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1864: {
1865: if (!success)
1866: fatal("stdio forwarding failed");
1867: }
1868:
1869: static void
1.523 djm 1870: ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
1871: {
1872: if (!success) {
1873: error("Tunnel forwarding failed");
1874: if (options.exit_on_forward_failure)
1875: cleanup_exit(255);
1876: }
1877:
1.540 djm 1878: debug_f("tunnel forward established, id=%d", id);
1.523 djm 1879: forwarding_success();
1880: }
1881:
1882: static void
1.463 djm 1883: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1884: {
1885: Channel *c;
1.332 djm 1886: int in, out;
1.331 dtucker 1887:
1.441 dtucker 1888: if (options.stdio_forward_host == NULL)
1.368 djm 1889: return;
1890:
1.540 djm 1891: debug3_f("%s:%d", options.stdio_forward_host,
1.441 dtucker 1892: options.stdio_forward_port);
1.332 djm 1893:
1.505 deraadt 1894: if ((in = dup(STDIN_FILENO)) == -1 ||
1895: (out = dup(STDOUT_FILENO)) == -1)
1.557 djm 1896: fatal_f("dup() in/out failed");
1.463 djm 1897: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.557 djm 1898: options.stdio_forward_port, in, out,
1899: CHANNEL_NONBLOCK_STDIO)) == NULL)
1.540 djm 1900: fatal_f("channel_connect_stdio_fwd failed");
1.463 djm 1901: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1902: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1903: }
1904:
1905: static void
1.551 markus 1906: ssh_init_forward_permissions(struct ssh *ssh, const char *what, char **opens,
1907: u_int num_opens)
1908: {
1909: u_int i;
1910: int port;
1.573 dtucker 1911: char *addr, *arg, *oarg;
1.551 markus 1912: int where = FORWARD_LOCAL;
1913:
1914: channel_clear_permission(ssh, FORWARD_ADM, where);
1915: if (num_opens == 0)
1916: return; /* permit any */
1917:
1918: /* handle keywords: "any" / "none" */
1919: if (num_opens == 1 && strcmp(opens[0], "any") == 0)
1920: return;
1921: if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
1922: channel_disable_admin(ssh, where);
1923: return;
1924: }
1925: /* Otherwise treat it as a list of permitted host:port */
1926: for (i = 0; i < num_opens; i++) {
1927: oarg = arg = xstrdup(opens[i]);
1.573 dtucker 1928: addr = hpdelim(&arg);
1929: if (addr == NULL)
1.551 markus 1930: fatal_f("missing host in %s", what);
1931: addr = cleanhostname(addr);
1932: if (arg == NULL || ((port = permitopen_port(arg)) < 0))
1933: fatal_f("bad port number in %s", what);
1934: /* Send it to channels layer */
1935: channel_add_permission(ssh, FORWARD_ADM,
1936: where, addr, port);
1937: free(oarg);
1938: }
1939: }
1940:
1941: static void
1.466 djm 1942: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1943: {
1.86 markus 1944: int success = 0;
1.70 markus 1945: int i;
1.551 markus 1946:
1947: ssh_init_forward_permissions(ssh, "permitremoteopen",
1948: options.permitted_remote_opens,
1949: options.num_permitted_remote_opens);
1.331 dtucker 1950:
1.524 djm 1951: if (options.exit_on_forward_failure)
1952: forward_confirms_pending = 0; /* track pending requests */
1.70 markus 1953: /* Initiate local TCP/IP port forwardings. */
1954: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1955: debug("Local connections to %.200s:%d forwarded to remote "
1956: "address %.200s:%d",
1.406 millert 1957: (options.local_forwards[i].listen_path != NULL) ?
1958: options.local_forwards[i].listen_path :
1.234 deraadt 1959: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1960: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1961: options.local_forwards[i].listen_host,
1962: options.local_forwards[i].listen_port,
1.406 millert 1963: (options.local_forwards[i].connect_path != NULL) ?
1964: options.local_forwards[i].connect_path :
1.232 djm 1965: options.local_forwards[i].connect_host,
1966: options.local_forwards[i].connect_port);
1.463 djm 1967: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1968: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1969: }
1.283 markus 1970: if (i > 0 && success != i && options.exit_on_forward_failure)
1971: fatal("Could not request local forwarding.");
1.86 markus 1972: if (i > 0 && success == 0)
1973: error("Could not request local forwarding.");
1.70 markus 1974:
1975: /* Initiate remote TCP/IP port forwardings. */
1976: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1977: debug("Remote connections from %.200s:%d forwarded to "
1978: "local address %.200s:%d",
1.406 millert 1979: (options.remote_forwards[i].listen_path != NULL) ?
1980: options.remote_forwards[i].listen_path :
1.248 djm 1981: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1982: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1983: options.remote_forwards[i].listen_port,
1.406 millert 1984: (options.remote_forwards[i].connect_path != NULL) ?
1985: options.remote_forwards[i].connect_path :
1.232 djm 1986: options.remote_forwards[i].connect_host,
1987: options.remote_forwards[i].connect_port);
1.523 djm 1988: if ((options.remote_forwards[i].handle =
1.463 djm 1989: channel_request_remote_forwarding(ssh,
1.523 djm 1990: &options.remote_forwards[i])) >= 0) {
1.463 djm 1991: client_register_global_confirm(
1992: ssh_confirm_remote_forward,
1.366 markus 1993: &options.remote_forwards[i]);
1.523 djm 1994: forward_confirms_pending++;
1995: } else if (options.exit_on_forward_failure)
1996: fatal("Could not request remote forwarding.");
1997: else
1998: logit("Warning: Could not request remote forwarding.");
1.70 markus 1999: }
1.301 djm 2000:
2001: /* Initiate tunnel forwarding. */
2002: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 2003: if ((*ifname = client_request_tun_fwd(ssh,
2004: options.tun_open, options.tun_local,
1.523 djm 2005: options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
2006: forward_confirms_pending++;
2007: else if (options.exit_on_forward_failure)
2008: fatal("Could not request tunnel forwarding.");
2009: else
2010: error("Could not request tunnel forwarding.");
1.524 djm 2011: }
2012: if (forward_confirms_pending > 0) {
1.540 djm 2013: debug_f("expecting replies for %d forwards",
1.524 djm 2014: forward_confirms_pending);
1.468 djm 2015: }
1.70 markus 2016: }
2017:
1.126 itojun 2018: static void
1.70 markus 2019: check_agent_present(void)
2020: {
1.412 djm 2021: int r;
2022:
1.70 markus 2023: if (options.forward_agent) {
1.254 djm 2024: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 2025: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 2026: options.forward_agent = 0;
1.412 djm 2027: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.540 djm 2028: debug_r(r, "ssh_get_authentication_socket");
1.412 djm 2029: }
1.70 markus 2030: }
2031: }
2032:
1.214 djm 2033: static void
1.463 djm 2034: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 2035: {
1.215 djm 2036: extern char **environ;
1.558 djm 2037: const char *display, *term;
1.499 djm 2038: int r, interactive = tty_flag;
1.433 djm 2039: char *proto = NULL, *data = NULL;
1.337 djm 2040:
2041: if (!success)
1.580 djm 2042: return; /* No need for error message, channels code sends one */
1.215 djm 2043:
1.248 djm 2044: display = getenv("DISPLAY");
1.417 djm 2045: if (display == NULL && options.forward_x11)
2046: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 2047: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 2048: options.xauth_location, options.forward_x11_trusted,
2049: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 2050: /* Request forwarding with authentication spoofing. */
1.316 djm 2051: debug("Requesting X11 forwarding with authentication "
2052: "spoofing.");
1.463 djm 2053: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 2054: data, 1);
1.463 djm 2055: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 2056: /* XXX exit_on_forward_failure */
1.80 markus 2057: interactive = 1;
1.50 markus 2058: }
2059:
1.70 markus 2060: check_agent_present();
2061: if (options.forward_agent) {
2062: debug("Requesting authentication agent forwarding.");
1.463 djm 2063: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 2064: if ((r = sshpkt_send(ssh)) != 0)
1.540 djm 2065: fatal_fr(r, "send packet");
1.212 djm 2066: }
1.369 dtucker 2067:
2068: /* Tell the packet module whether this is an interactive session. */
1.499 djm 2069: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 2070: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 2071:
1.558 djm 2072: if ((term = lookup_env_in_list("TERM", options.setenv,
2073: options.num_setenv)) == NULL || *term == '\0')
2074: term = getenv("TERM");
1.562 djm 2075: client_session2_setup(ssh, id, tty_flag,
2076: options.session_type == SESSION_TYPE_SUBSYSTEM, term,
1.482 markus 2077: NULL, fileno(stdin), command, environ);
1.45 markus 2078: }
2079:
1.143 markus 2080: /* open new channel for a session */
1.126 itojun 2081: static int
1.463 djm 2082: ssh_session2_open(struct ssh *ssh)
1.45 markus 2083: {
1.118 markus 2084: Channel *c;
2085: int window, packetmax, in, out, err;
1.60 markus 2086:
1.563 djm 2087: if (options.stdin_null) {
1.93 itojun 2088: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 2089: } else {
2090: in = dup(STDIN_FILENO);
2091: }
1.60 markus 2092: out = dup(STDOUT_FILENO);
2093: err = dup(STDERR_FILENO);
1.45 markus 2094:
1.505 deraadt 2095: if (in == -1 || out == -1 || err == -1)
1.62 markus 2096: fatal("dup() in/out/err failed");
1.45 markus 2097:
1.65 markus 2098: window = CHAN_SES_WINDOW_DEFAULT;
2099: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 2100: if (tty_flag) {
2101: window >>= 1;
2102: packetmax >>= 1;
1.45 markus 2103: }
1.463 djm 2104: c = channel_new(ssh,
1.45 markus 2105: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 2106: window, packetmax, CHAN_EXTENDED_WRITE,
1.557 djm 2107: "client-session", CHANNEL_NONBLOCK_STDIO);
1.45 markus 2108:
1.540 djm 2109: debug3_f("channel_new: %d", c->self);
1.106 markus 2110:
1.463 djm 2111: channel_send_open(ssh, c->self);
1.560 djm 2112: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2113: channel_register_open_confirm(ssh, c->self,
1.310 djm 2114: ssh_session2_setup, NULL);
1.106 markus 2115:
1.118 markus 2116: return c->self;
1.106 markus 2117: }
2118:
1.126 itojun 2119: static int
1.544 djm 2120: ssh_session2(struct ssh *ssh, const struct ssh_conn_info *cinfo)
1.106 markus 2121: {
1.594 ! djm 2122: int r, interactive, id = -1;
1.466 djm 2123: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 2124:
2125: /* XXX should be pre-session */
1.368 djm 2126: if (!options.control_persist)
1.463 djm 2127: ssh_init_stdio_forwarding(ssh);
1.466 djm 2128:
2129: ssh_init_forwarding(ssh, &tun_fwd_ifname);
2130:
2131: if (options.local_command != NULL) {
2132: debug3("expanding LocalCommand: %s", options.local_command);
2133: cp = options.local_command;
2134: options.local_command = percent_expand(cp,
1.546 djm 2135: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.466 djm 2136: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2137: (char *)NULL);
2138: debug3("expanded LocalCommand: %s", options.local_command);
2139: free(cp);
2140: }
1.106 markus 2141:
1.344 djm 2142: /* Start listening for multiplex clients */
1.499 djm 2143: if (!ssh_packet_get_mux(ssh))
1.463 djm 2144: muxserver_listen(ssh);
1.344 djm 2145:
1.473 djm 2146: /*
1.368 djm 2147: * If we are in control persist mode and have a working mux listen
2148: * socket, then prepare to background ourselves and have a foreground
1.531 djm 2149: * client attach as a control client.
1.368 djm 2150: * NB. we must save copies of the flags that we override for
1.531 djm 2151: * the backgrounding, since we defer attachment of the client until
1.344 djm 2152: * after the connection is fully established (in particular,
2153: * async rfwd replies have been received for ExitOnForwardFailure).
2154: */
1.473 djm 2155: if (options.control_persist && muxserver_sock != -1) {
1.563 djm 2156: ostdin_null_flag = options.stdin_null;
1.560 djm 2157: osession_type = options.session_type;
1.359 djm 2158: orequest_tty = options.request_tty;
1.344 djm 2159: otty_flag = tty_flag;
1.593 djm 2160: ofork_after_authentication = options.fork_after_authentication;
1.563 djm 2161: options.stdin_null = 1;
1.560 djm 2162: options.session_type = SESSION_TYPE_NONE;
1.473 djm 2163: tty_flag = 0;
1.593 djm 2164: if ((osession_type != SESSION_TYPE_NONE ||
1.562 djm 2165: options.stdio_forward_host != NULL))
1.344 djm 2166: need_controlpersist_detach = 1;
1.564 djm 2167: options.fork_after_authentication = 1;
1.473 djm 2168: }
1.368 djm 2169: /*
2170: * ControlPersist mux listen socket setup failed, attempt the
2171: * stdio forward setup that we skipped earlier.
2172: */
2173: if (options.control_persist && muxserver_sock == -1)
1.463 djm 2174: ssh_init_stdio_forwarding(ssh);
1.344 djm 2175:
1.560 djm 2176: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2177: id = ssh_session2_open(ssh);
1.379 djm 2178: else {
1.594 ! djm 2179: interactive = options.control_master == SSHCTL_MASTER_NO;
! 2180: /* ControlPersist may have clobbered ControlMaster, so check */
! 2181: if (need_controlpersist_detach)
! 2182: interactive = otty_flag != 0;
! 2183: ssh_packet_set_interactive(ssh, interactive,
1.379 djm 2184: options.ip_qos_interactive, options.ip_qos_bulk);
2185: }
1.314 djm 2186:
2187: /* If we don't expect to open a new session, then disallow it */
1.319 markus 2188: if (options.control_master == SSHCTL_MASTER_NO &&
1.549 djm 2189: (ssh->compat & SSH_NEW_OPENSSH)) {
1.314 djm 2190: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 2191: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2192: (r = sshpkt_put_cstring(ssh,
2193: "no-more-sessions@openssh.com")) != 0 ||
2194: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2195: (r = sshpkt_send(ssh)) != 0)
1.540 djm 2196: fatal_fr(r, "send packet");
1.314 djm 2197: }
1.255 reyk 2198:
2199: /* Execute a local command */
2200: if (options.local_command != NULL &&
2201: options.permit_local_command)
2202: ssh_local_cmd(options.local_command);
1.467 djm 2203:
2204: /*
2205: * stdout is now owned by the session channel; clobber it here
2206: * so future channel closes are propagated to the local fd.
2207: * NB. this can only happen after LocalCommand has completed,
2208: * as it may want to write to stdout.
2209: */
1.537 djm 2210: if (!need_controlpersist_detach && stdfd_devnull(0, 1, 0) == -1)
1.540 djm 2211: error_f("stdfd_devnull failed");
1.301 djm 2212:
1.342 djm 2213: /*
2214: * If requested and we are not interested in replies to remote
2215: * forwarding requests, then let ssh continue in the background.
2216: */
1.564 djm 2217: if (options.fork_after_authentication) {
1.344 djm 2218: if (options.exit_on_forward_failure &&
2219: options.num_remote_forwards > 0) {
2220: debug("deferring postauth fork until remote forward "
2221: "confirmation received");
2222: } else
2223: fork_postauth();
1.318 djm 2224: }
1.31 markus 2225:
1.463 djm 2226: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2227: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2228: }
2229:
1.426 djm 2230: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2231: static void
1.544 djm 2232: load_public_identity_files(const struct ssh_conn_info *cinfo)
1.104 markus 2233: {
1.466 djm 2234: char *filename, *cp;
1.460 markus 2235: struct sshkey *public;
1.426 djm 2236: int i;
2237: u_int n_ids, n_certs;
1.335 djm 2238: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2239: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2240: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2241: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2242: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2243: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2244: #ifdef ENABLE_PKCS11
1.514 djm 2245: struct sshkey **keys = NULL;
2246: char **comments = NULL;
1.333 markus 2247: int nkeys;
1.335 djm 2248: #endif /* PKCS11 */
1.104 markus 2249:
1.426 djm 2250: n_ids = n_certs = 0;
1.398 tedu 2251: memset(identity_files, 0, sizeof(identity_files));
2252: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2253: memset(identity_file_userprovided, 0,
2254: sizeof(identity_file_userprovided));
1.426 djm 2255: memset(certificate_files, 0, sizeof(certificate_files));
2256: memset(certificates, 0, sizeof(certificates));
1.484 djm 2257: memset(certificate_file_userprovided, 0,
2258: sizeof(certificate_file_userprovided));
1.335 djm 2259:
2260: #ifdef ENABLE_PKCS11
1.333 markus 2261: if (options.pkcs11_provider != NULL &&
1.167 markus 2262: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2263: (pkcs11_init(!options.batch_mode) == 0) &&
2264: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1.514 djm 2265: &keys, &comments)) > 0) {
1.333 markus 2266: for (i = 0; i < nkeys; i++) {
1.335 djm 2267: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2268: sshkey_free(keys[i]);
1.514 djm 2269: free(comments[i]);
1.335 djm 2270: continue;
2271: }
2272: identity_keys[n_ids] = keys[i];
1.514 djm 2273: identity_files[n_ids] = comments[i]; /* transferred */
1.335 djm 2274: n_ids++;
1.167 markus 2275: }
1.378 djm 2276: free(keys);
1.514 djm 2277: free(comments);
1.127 markus 2278: }
1.333 markus 2279: #endif /* ENABLE_PKCS11 */
1.335 djm 2280: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2281: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2282: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2283: free(options.identity_files[i]);
1.426 djm 2284: options.identity_files[i] = NULL;
1.335 djm 2285: continue;
2286: }
1.490 dtucker 2287: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.544 djm 2288: filename = default_client_percent_dollar_expand(cp, cinfo);
1.378 djm 2289: free(cp);
1.483 markus 2290: check_load(sshkey_load_public(filename, &public, NULL),
1.576 djm 2291: &public, filename, "pubkey");
1.131 millert 2292: debug("identity file %s type %d", filename,
2293: public ? public->type : -1);
1.378 djm 2294: free(options.identity_files[i]);
1.335 djm 2295: identity_files[n_ids] = filename;
2296: identity_keys[n_ids] = public;
1.484 djm 2297: identity_file_userprovided[n_ids] =
2298: options.identity_file_userprovided[i];
1.335 djm 2299: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2300: continue;
2301:
1.426 djm 2302: /*
2303: * If no certificates have been explicitly listed then try
2304: * to add the default certificate variant too.
2305: */
2306: if (options.num_certificate_files != 0)
2307: continue;
1.335 djm 2308: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2309: check_load(sshkey_load_public(cp, &public, NULL),
1.576 djm 2310: &public, filename, "pubkey");
1.335 djm 2311: debug("identity file %s type %d", cp,
2312: public ? public->type : -1);
2313: if (public == NULL) {
1.378 djm 2314: free(cp);
1.335 djm 2315: continue;
2316: }
1.483 markus 2317: if (!sshkey_is_cert(public)) {
1.540 djm 2318: debug_f("key %s type %s is not a certificate",
2319: cp, sshkey_type(public));
1.483 markus 2320: sshkey_free(public);
1.378 djm 2321: free(cp);
1.335 djm 2322: continue;
2323: }
1.448 djm 2324: /* NB. leave filename pointing to private key */
2325: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2326: identity_keys[n_ids] = public;
1.484 djm 2327: identity_file_userprovided[n_ids] =
2328: options.identity_file_userprovided[i];
1.335 djm 2329: n_ids++;
2330: }
1.426 djm 2331:
2332: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
1.540 djm 2333: fatal_f("too many certificates");
1.426 djm 2334: for (i = 0; i < options.num_certificate_files; i++) {
2335: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2336: getuid());
1.544 djm 2337: filename = default_client_percent_dollar_expand(cp, cinfo);
1.426 djm 2338: free(cp);
2339:
1.483 markus 2340: check_load(sshkey_load_public(filename, &public, NULL),
1.576 djm 2341: &public, filename, "certificate");
1.426 djm 2342: debug("certificate file %s type %d", filename,
2343: public ? public->type : -1);
2344: free(options.certificate_files[i]);
2345: options.certificate_files[i] = NULL;
2346: if (public == NULL) {
2347: free(filename);
2348: continue;
2349: }
1.483 markus 2350: if (!sshkey_is_cert(public)) {
1.540 djm 2351: debug_f("key %s type %s is not a certificate",
2352: filename, sshkey_type(public));
1.483 markus 2353: sshkey_free(public);
1.426 djm 2354: free(filename);
2355: continue;
2356: }
2357: certificate_files[n_certs] = filename;
2358: certificates[n_certs] = public;
1.484 djm 2359: certificate_file_userprovided[n_certs] =
2360: options.certificate_file_userprovided[i];
1.426 djm 2361: ++n_certs;
2362: }
2363:
1.335 djm 2364: options.num_identity_files = n_ids;
2365: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2366: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2367: memcpy(options.identity_file_userprovided,
2368: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2369:
2370: options.num_certificate_files = n_certs;
2371: memcpy(options.certificate_files,
2372: certificate_files, sizeof(certificate_files));
2373: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2374: memcpy(options.certificate_file_userprovided,
2375: certificate_file_userprovided,
2376: sizeof(certificate_file_userprovided));
1.214 djm 2377: }
1.352 djm 2378:
2379: static void
2380: main_sigchld_handler(int sig)
2381: {
2382: int save_errno = errno;
2383: pid_t pid;
2384: int status;
2385:
2386: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2387: (pid == -1 && errno == EINTR))
1.352 djm 2388: ;
2389: errno = save_errno;
2390: }
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