Annotation of src/usr.bin/ssh/ssh.c, Revision 1.584
1.584 ! millert 1: /* $OpenBSD: ssh.c,v 1.583 2023/01/13 02:58:20 dtucker Exp $ */
1.1 deraadt 2: /*
1.32 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * Ssh client program. This program can be used to log into a remote machine.
7: * The software supports strong authentication, encryption, and forwarding
8: * of X11, TCP/IP, and authentication connections.
9: *
1.64 deraadt 10: * As far as I am concerned, the code I have written for this software
11: * can be used freely for any purpose. Any derived versions of this
12: * software must be clearly marked as such, and if the derived work is
13: * incompatible with the protocol description in the RFC file, it must be
14: * called by a name other than "ssh" or "Secure Shell".
15: *
16: * Copyright (c) 1999 Niels Provos. All rights reserved.
1.202 markus 17: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 18: *
1.529 dtucker 19: * Modified to work with SSLeay by Niels Provos <provos@citi.umich.edu>
1.64 deraadt 20: * in Canada (German citizen).
21: *
22: * Redistribution and use in source and binary forms, with or without
23: * modification, are permitted provided that the following conditions
24: * are met:
25: * 1. Redistributions of source code must retain the above copyright
26: * notice, this list of conditions and the following disclaimer.
27: * 2. Redistributions in binary form must reproduce the above copyright
28: * notice, this list of conditions and the following disclaimer in the
29: * documentation and/or other materials provided with the distribution.
30: *
31: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 41: */
1.1 deraadt 42:
1.293 deraadt 43: #include <sys/types.h>
1.312 djm 44: #include <sys/ioctl.h>
45: #include <sys/queue.h>
1.259 stevesk 46: #include <sys/resource.h>
1.280 stevesk 47: #include <sys/socket.h>
1.264 stevesk 48: #include <sys/stat.h>
1.312 djm 49: #include <sys/time.h>
1.352 djm 50: #include <sys/wait.h>
1.258 stevesk 51:
1.265 stevesk 52: #include <ctype.h>
1.285 stevesk 53: #include <errno.h>
1.281 stevesk 54: #include <fcntl.h>
1.286 stevesk 55: #include <netdb.h>
1.258 stevesk 56: #include <paths.h>
1.279 stevesk 57: #include <pwd.h>
1.263 stevesk 58: #include <signal.h>
1.287 stevesk 59: #include <stddef.h>
1.291 stevesk 60: #include <stdio.h>
1.290 stevesk 61: #include <stdlib.h>
1.289 stevesk 62: #include <string.h>
1.509 naddy 63: #include <stdarg.h>
1.288 stevesk 64: #include <unistd.h>
1.414 deraadt 65: #include <limits.h>
1.445 djm 66: #include <locale.h>
1.49 markus 67:
1.402 markus 68: #ifdef WITH_OPENSSL
1.49 markus 69: #include <openssl/evp.h>
1.72 markus 70: #include <openssl/err.h>
1.402 markus 71: #endif
1.1 deraadt 72:
1.293 deraadt 73: #include "xmalloc.h"
1.84 markus 74: #include "ssh.h"
75: #include "ssh2.h"
1.341 djm 76: #include "canohost.h"
1.84 markus 77: #include "compat.h"
78: #include "cipher.h"
1.1 deraadt 79: #include "packet.h"
1.482 markus 80: #include "sshbuf.h"
1.123 markus 81: #include "channels.h"
1.483 markus 82: #include "sshkey.h"
1.58 markus 83: #include "authfd.h"
1.49 markus 84: #include "authfile.h"
1.83 markus 85: #include "pathnames.h"
1.214 djm 86: #include "dispatch.h"
1.81 markus 87: #include "clientloop.h"
1.84 markus 88: #include "log.h"
1.406 millert 89: #include "misc.h"
1.84 markus 90: #include "readconf.h"
91: #include "sshconnect.h"
1.95 markus 92: #include "kex.h"
93: #include "mac.h"
1.213 deraadt 94: #include "sshpty.h"
1.212 djm 95: #include "match.h"
1.214 djm 96: #include "msg.h"
1.278 stevesk 97: #include "version.h"
1.412 djm 98: #include "ssherr.h"
1.420 djm 99: #include "myproposal.h"
1.49 markus 100:
1.333 markus 101: #ifdef ENABLE_PKCS11
102: #include "ssh-pkcs11.h"
1.137 jakob 103: #endif
1.498 djm 104:
1.49 markus 105: extern char *__progname;
1.1 deraadt 106:
1.316 djm 107: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 108: int debug_flag = 0;
109:
1.359 djm 110: /* Flag indicating whether a tty should be requested */
1.1 deraadt 111: int tty_flag = 0;
112:
1.33 markus 113: /*
1.344 djm 114: * Flag indicating that the current process should be backgrounded and
1.531 djm 115: * a new mux-client launched in the foreground for ControlPersist.
1.344 djm 116: */
117: int need_controlpersist_detach = 0;
118:
1.531 djm 119: /* Copies of flags for ControlPersist foreground mux-client */
1.560 djm 120: int ostdin_null_flag, osession_type, otty_flag, orequest_tty;
1.344 djm 121:
122: /*
1.33 markus 123: * General data structure for command line options and options configurable
124: * in configuration files. See readconf.h.
125: */
1.1 deraadt 126: Options options;
127:
1.139 markus 128: /* optional user configfile */
129: char *config = NULL;
130:
1.33 markus 131: /*
132: * Name of the host we are connecting to. This is the name given on the
1.503 jmc 133: * command line, or the Hostname specified for the user-supplied name in a
1.33 markus 134: * configuration file.
135: */
1.1 deraadt 136: char *host;
137:
1.510 djm 138: /*
139: * A config can specify a path to forward, overriding SSH_AUTH_SOCK. If this is
140: * not NULL, forward the socket at this path instead.
141: */
142: char *forward_agent_sock_path = NULL;
143:
1.22 provos 144: /* socket address the host resolves to */
1.37 markus 145: struct sockaddr_storage hostaddr;
1.1 deraadt 146:
1.112 markus 147: /* Private host keys. */
1.173 markus 148: Sensitive sensitive_data;
1.1 deraadt 149:
1.45 markus 150: /* command to be executed */
1.482 markus 151: struct sshbuf *command;
1.45 markus 152:
1.170 markus 153: /* # of replies received for global requests */
1.523 djm 154: static int forward_confirms_pending = -1;
1.170 markus 155:
1.313 djm 156: /* mux.c */
157: extern int muxserver_sock;
158: extern u_int muxclient_command;
159:
1.1 deraadt 160: /* Prints a help message to the user. This function never returns. */
161:
1.126 itojun 162: static void
1.93 itojun 163: usage(void)
1.1 deraadt 164: {
1.208 markus 165: fprintf(stderr,
1.474 djm 166: "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n"
167: " [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n"
168: " [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n"
169: " [-i identity_file] [-J [user@]host[:port]] [-L address]\n"
170: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
171: " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
1.567 dtucker 172: " [-w local_tun[:remote_tun]] destination [command [argument ...]]\n"
1.208 markus 173: );
1.257 dtucker 174: exit(255);
1.1 deraadt 175: }
176:
1.544 djm 177: static int ssh_session2(struct ssh *, const struct ssh_conn_info *);
178: static void load_public_identity_files(const struct ssh_conn_info *);
1.352 djm 179: static void main_sigchld_handler(int);
1.312 djm 180:
1.361 djm 181: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
182: static void
183: tilde_expand_paths(char **paths, u_int num_paths)
184: {
185: u_int i;
186: char *cp;
187:
188: for (i = 0; i < num_paths; i++) {
1.490 dtucker 189: cp = tilde_expand_filename(paths[i], getuid());
1.378 djm 190: free(paths[i]);
1.361 djm 191: paths[i] = cp;
192: }
193: }
194:
1.527 dtucker 195: /*
196: * Expands the set of percent_expand options used by the majority of keywords
197: * in the client that support percent expansion.
198: * Caller must free returned string.
199: */
200: static char *
1.544 djm 201: default_client_percent_expand(const char *str,
202: const struct ssh_conn_info *cinfo)
1.527 dtucker 203: {
204: return percent_expand(str,
1.546 djm 205: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.527 dtucker 206: (char *)NULL);
207: }
208:
1.400 djm 209: /*
1.528 dtucker 210: * Expands the set of percent_expand options used by the majority of keywords
211: * AND perform environment variable substitution.
212: * Caller must free returned string.
213: */
214: static char *
1.544 djm 215: default_client_percent_dollar_expand(const char *str,
216: const struct ssh_conn_info *cinfo)
1.528 dtucker 217: {
218: char *ret;
219:
220: ret = percent_dollar_expand(str,
1.546 djm 221: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.528 dtucker 222: (char *)NULL);
223: if (ret == NULL)
224: fatal("invalid environment variable expansion");
225: return ret;
226: }
227:
228: /*
1.400 djm 229: * Attempt to resolve a host name / port to a set of addresses and
230: * optionally return any CNAMEs encountered along the way.
231: * Returns NULL on failure.
232: * NB. this function must operate with a options having undefined members.
233: */
1.385 djm 234: static struct addrinfo *
1.400 djm 235: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 236: {
237: char strport[NI_MAXSERV];
1.579 djm 238: const char *errstr = NULL;
1.385 djm 239: struct addrinfo hints, *res;
1.501 dtucker 240: int gaierr;
241: LogLevel loglevel = SYSLOG_LEVEL_DEBUG1;
1.385 djm 242:
1.400 djm 243: if (port <= 0)
244: port = default_ssh_port();
1.521 markus 245: if (cname != NULL)
246: *cname = '\0';
1.568 djm 247: debug3_f("lookup %s:%d", name, port);
1.400 djm 248:
1.427 djm 249: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 250: memset(&hints, 0, sizeof(hints));
1.400 djm 251: hints.ai_family = options.address_family == -1 ?
252: AF_UNSPEC : options.address_family;
1.385 djm 253: hints.ai_socktype = SOCK_STREAM;
254: if (cname != NULL)
255: hints.ai_flags = AI_CANONNAME;
256: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
257: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
258: loglevel = SYSLOG_LEVEL_ERROR;
259: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
260: __progname, name, ssh_gai_strerror(gaierr));
261: return NULL;
262: }
263: if (cname != NULL && res->ai_canonname != NULL) {
1.579 djm 264: if (!valid_domain(res->ai_canonname, 0, &errstr)) {
265: error("ignoring bad CNAME \"%s\" for host \"%s\": %s",
266: res->ai_canonname, name, errstr);
267: } else if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
1.540 djm 268: error_f("host \"%s\" cname \"%s\" too long (max %lu)",
269: name, res->ai_canonname, (u_long)clen);
1.385 djm 270: if (clen > 0)
271: *cname = '\0';
272: }
273: }
274: return res;
275: }
276:
1.470 djm 277: /* Returns non-zero if name can only be an address and not a hostname */
278: static int
279: is_addr_fast(const char *name)
280: {
281: return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
282: strspn(name, "0123456789.") == strlen(name));
283: }
284:
285: /* Returns non-zero if name represents a valid, single address */
286: static int
287: is_addr(const char *name)
288: {
289: char strport[NI_MAXSERV];
290: struct addrinfo hints, *res;
291:
292: if (is_addr_fast(name))
293: return 1;
294:
295: snprintf(strport, sizeof strport, "%u", default_ssh_port());
296: memset(&hints, 0, sizeof(hints));
297: hints.ai_family = options.address_family == -1 ?
298: AF_UNSPEC : options.address_family;
299: hints.ai_socktype = SOCK_STREAM;
300: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
301: if (getaddrinfo(name, strport, &hints, &res) != 0)
302: return 0;
303: if (res == NULL || res->ai_next != NULL) {
304: freeaddrinfo(res);
305: return 0;
306: }
307: freeaddrinfo(res);
308: return 1;
309: }
310:
1.385 djm 311: /*
1.413 djm 312: * Attempt to resolve a numeric host address / port to a single address.
313: * Returns a canonical address string.
314: * Returns NULL on failure.
315: * NB. this function must operate with a options having undefined members.
316: */
317: static struct addrinfo *
318: resolve_addr(const char *name, int port, char *caddr, size_t clen)
319: {
320: char addr[NI_MAXHOST], strport[NI_MAXSERV];
321: struct addrinfo hints, *res;
322: int gaierr;
323:
324: if (port <= 0)
325: port = default_ssh_port();
326: snprintf(strport, sizeof strport, "%u", port);
327: memset(&hints, 0, sizeof(hints));
328: hints.ai_family = options.address_family == -1 ?
329: AF_UNSPEC : options.address_family;
330: hints.ai_socktype = SOCK_STREAM;
331: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
332: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
1.540 djm 333: debug2_f("could not resolve name %.100s as address: %s",
334: name, ssh_gai_strerror(gaierr));
1.413 djm 335: return NULL;
336: }
337: if (res == NULL) {
1.540 djm 338: debug_f("getaddrinfo %.100s returned no addresses", name);
1.413 djm 339: return NULL;
340: }
341: if (res->ai_next != NULL) {
1.540 djm 342: debug_f("getaddrinfo %.100s returned multiple addresses", name);
1.413 djm 343: goto fail;
344: }
345: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
346: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
1.540 djm 347: debug_f("Could not format address for name %.100s: %s",
348: name, ssh_gai_strerror(gaierr));
1.413 djm 349: goto fail;
350: }
351: if (strlcpy(caddr, addr, clen) >= clen) {
1.540 djm 352: error_f("host \"%s\" addr \"%s\" too long (max %lu)",
353: name, addr, (u_long)clen);
1.413 djm 354: if (clen > 0)
355: *caddr = '\0';
356: fail:
357: freeaddrinfo(res);
358: return NULL;
359: }
360: return res;
361: }
362:
363: /*
1.385 djm 364: * Check whether the cname is a permitted replacement for the hostname
365: * and perform the replacement if it is.
1.400 djm 366: * NB. this function must operate with a options having undefined members.
1.385 djm 367: */
368: static int
1.443 djm 369: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 370: {
371: int i;
372: struct allowed_cname *rule;
373:
1.568 djm 374: if (*cname == '\0' || !config_has_permitted_cnames(&options) ||
1.385 djm 375: strcmp(*namep, cname) == 0)
376: return 0;
1.386 djm 377: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 378: return 0;
379: /*
1.386 djm 380: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 381: * a proxy or jump host unless the user specifically requests so.
1.385 djm 382: */
1.443 djm 383: if (!direct &&
1.386 djm 384: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 385: return 0;
1.540 djm 386: debug3_f("check \"%s\" CNAME \"%s\"", *namep, cname);
1.385 djm 387: for (i = 0; i < options.num_permitted_cnames; i++) {
388: rule = options.permitted_cnames + i;
1.418 djm 389: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
390: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 391: continue;
1.386 djm 392: verbose("Canonicalized DNS aliased hostname "
1.385 djm 393: "\"%s\" => \"%s\"", *namep, cname);
394: free(*namep);
395: *namep = xstrdup(cname);
396: return 1;
397: }
398: return 0;
399: }
400:
401: /*
402: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 403: * canonicalization rules. Returns the address list for the host or NULL
404: * if no name was found after canonicalization.
1.400 djm 405: * NB. this function must operate with a options having undefined members.
1.385 djm 406: */
407: static struct addrinfo *
1.400 djm 408: resolve_canonicalize(char **hostp, int port)
1.385 djm 409: {
1.443 djm 410: int i, direct, ndots;
1.413 djm 411: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 412: struct addrinfo *addrs;
413:
414: /*
1.470 djm 415: * Attempt to canonicalise addresses, regardless of
416: * whether hostname canonicalisation was requested
1.385 djm 417: */
1.413 djm 418: if ((addrs = resolve_addr(*hostp, port,
419: newname, sizeof(newname))) != NULL) {
1.540 djm 420: debug2_f("hostname %.100s is address", *hostp);
1.413 djm 421: if (strcasecmp(*hostp, newname) != 0) {
1.540 djm 422: debug2_f("canonicalised address \"%s\" => \"%s\"",
423: *hostp, newname);
1.413 djm 424: free(*hostp);
425: *hostp = xstrdup(newname);
426: }
427: return addrs;
428: }
429:
1.470 djm 430: /*
431: * If this looks like an address but didn't parse as one, it might
432: * be an address with an invalid interface scope. Skip further
433: * attempts at canonicalisation.
434: */
435: if (is_addr_fast(*hostp)) {
1.540 djm 436: debug_f("hostname %.100s is an unrecognised address", *hostp);
1.470 djm 437: return NULL;
438: }
439:
440: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
441: return NULL;
442:
443: /*
444: * Don't attempt to canonicalize names that will be interpreted by
445: * a proxy unless the user specifically requests so.
446: */
447: direct = option_clear_or_none(options.proxy_command) &&
448: options.jump_host == NULL;
449: if (!direct &&
450: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
451: return NULL;
452:
1.428 djm 453: /* If domain name is anchored, then resolve it now */
454: if ((*hostp)[strlen(*hostp) - 1] == '.') {
1.540 djm 455: debug3_f("name is fully qualified");
1.428 djm 456: fullhost = xstrdup(*hostp);
457: if ((addrs = resolve_host(fullhost, port, 0,
458: newname, sizeof(newname))) != NULL)
459: goto found;
460: free(fullhost);
461: goto notfound;
462: }
463:
1.387 djm 464: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 465: ndots = 0;
466: for (cp = *hostp; *cp != '\0'; cp++) {
467: if (*cp == '.')
468: ndots++;
469: }
1.386 djm 470: if (ndots > options.canonicalize_max_dots) {
1.540 djm 471: debug3_f("not canonicalizing hostname \"%s\" (max dots %d)",
472: *hostp, options.canonicalize_max_dots);
1.385 djm 473: return NULL;
474: }
475: /* Attempt each supplied suffix */
476: for (i = 0; i < options.num_canonical_domains; i++) {
1.559 djm 477: if (strcasecmp(options.canonical_domains[i], "none") == 0)
478: break;
1.385 djm 479: xasprintf(&fullhost, "%s.%s.", *hostp,
480: options.canonical_domains[i]);
1.540 djm 481: debug3_f("attempting \"%s\" => \"%s\"", *hostp, fullhost);
1.400 djm 482: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 483: newname, sizeof(newname))) == NULL) {
1.385 djm 484: free(fullhost);
485: continue;
486: }
1.428 djm 487: found:
1.385 djm 488: /* Remove trailing '.' */
489: fullhost[strlen(fullhost) - 1] = '\0';
490: /* Follow CNAME if requested */
1.443 djm 491: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 492: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 493: *hostp, fullhost);
494: }
495: free(*hostp);
496: *hostp = fullhost;
497: return addrs;
498: }
1.428 djm 499: notfound:
1.386 djm 500: if (!options.canonicalize_fallback_local)
1.400 djm 501: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
1.540 djm 502: debug2_f("host %s not found in any suffix", *hostp);
1.385 djm 503: return NULL;
504: }
505:
1.32 deraadt 506: /*
1.576 djm 507: * Check the result of hostkey loading, ignoring some errors and either
508: * discarding the key or fatal()ing for others.
1.483 markus 509: */
510: static void
1.576 djm 511: check_load(int r, struct sshkey **k, const char *path, const char *message)
1.483 markus 512: {
513: switch (r) {
514: case 0:
1.576 djm 515: /* Check RSA keys size and discard if undersized */
516: if (k != NULL && *k != NULL &&
517: (r = sshkey_check_rsa_length(*k,
518: options.required_rsa_size)) != 0) {
519: error_r(r, "load %s \"%s\"", message, path);
520: free(*k);
521: *k = NULL;
522: }
1.483 markus 523: break;
524: case SSH_ERR_INTERNAL_ERROR:
525: case SSH_ERR_ALLOC_FAIL:
1.540 djm 526: fatal_r(r, "load %s \"%s\"", message, path);
1.483 markus 527: case SSH_ERR_SYSTEM_ERROR:
528: /* Ignore missing files */
529: if (errno == ENOENT)
530: break;
531: /* FALLTHROUGH */
532: default:
1.540 djm 533: error_r(r, "load %s \"%s\"", message, path);
1.483 markus 534: break;
535: }
536: }
537:
538: /*
1.400 djm 539: * Read per-user configuration file. Ignore the system wide config
540: * file if the user specifies a config file on the command line.
541: */
542: static void
1.496 djm 543: process_config_files(const char *host_name, struct passwd *pw, int final_pass,
544: int *want_final_pass)
1.400 djm 545: {
1.414 deraadt 546: char buf[PATH_MAX];
1.400 djm 547: int r;
548:
549: if (config != NULL) {
550: if (strcasecmp(config, "none") != 0 &&
1.466 djm 551: !read_config_file(config, pw, host, host_name, &options,
1.496 djm 552: SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0),
553: want_final_pass))
1.400 djm 554: fatal("Can't open user config file %.100s: "
555: "%.100s", config, strerror(errno));
556: } else {
557: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
558: _PATH_SSH_USER_CONFFILE);
559: if (r > 0 && (size_t)r < sizeof(buf))
1.466 djm 560: (void)read_config_file(buf, pw, host, host_name,
1.408 djm 561: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
1.496 djm 562: (final_pass ? SSHCONF_FINAL : 0), want_final_pass);
1.400 djm 563:
564: /* Read systemwide configuration file after user config. */
1.408 djm 565: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
1.466 djm 566: host, host_name, &options,
1.496 djm 567: final_pass ? SSHCONF_FINAL : 0, want_final_pass);
1.408 djm 568: }
569: }
570:
571: /* Rewrite the port number in an addrinfo list of addresses */
572: static void
573: set_addrinfo_port(struct addrinfo *addrs, int port)
574: {
575: struct addrinfo *addr;
576:
577: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
578: switch (addr->ai_family) {
579: case AF_INET:
580: ((struct sockaddr_in *)addr->ai_addr)->
581: sin_port = htons(port);
582: break;
583: case AF_INET6:
584: ((struct sockaddr_in6 *)addr->ai_addr)->
585: sin6_port = htons(port);
586: break;
587: }
1.400 djm 588: }
589: }
590:
1.544 djm 591: static void
592: ssh_conn_info_free(struct ssh_conn_info *cinfo)
593: {
594: if (cinfo == NULL)
595: return;
596: free(cinfo->conn_hash_hex);
597: free(cinfo->shorthost);
598: free(cinfo->uidstr);
599: free(cinfo->keyalias);
600: free(cinfo->thishost);
601: free(cinfo->host_arg);
602: free(cinfo->portstr);
603: free(cinfo->remhost);
604: free(cinfo->remuser);
605: free(cinfo->homedir);
606: free(cinfo->locuser);
607: free(cinfo);
608: }
609:
1.400 djm 610: /*
1.32 deraadt 611: * Main program for the ssh client.
612: */
1.2 provos 613: int
614: main(int ac, char **av)
1.1 deraadt 615: {
1.437 djm 616: struct ssh *ssh = NULL;
1.462 djm 617: int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
1.496 djm 618: int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
1.583 dtucker 619: char *p, *cp, *line, *argv0, *logfile;
1.544 djm 620: char cname[NI_MAXHOST], thishost[NI_MAXHOST];
1.31 markus 621: struct stat st;
1.98 markus 622: struct passwd *pw;
1.144 stevesk 623: extern int optind, optreset;
624: extern char *optarg;
1.406 millert 625: struct Forward fwd;
1.385 djm 626: struct addrinfo *addrs = NULL;
1.513 dtucker 627: size_t n, len;
1.532 dtucker 628: u_int j;
1.544 djm 629: struct ssh_conn_info *cinfo = NULL;
1.250 djm 630:
631: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
632: sanitise_stdfd();
1.31 markus 633:
1.33 markus 634: /*
1.346 djm 635: * Discard other fds that are hanging around. These can cause problem
636: * with backgrounded ssh processes started by ControlPersist.
637: */
638: closefrom(STDERR_FILENO + 1);
639:
1.487 dtucker 640: if (getuid() != geteuid())
641: fatal("ssh setuid not supported.");
642: if (getgid() != getegid())
643: fatal("ssh setgid not supported.");
1.184 stevesk 644:
1.107 markus 645: /* Get user data. */
1.490 dtucker 646: pw = getpwuid(getuid());
1.107 markus 647: if (!pw) {
1.490 dtucker 648: logit("No user exists for uid %lu", (u_long)getuid());
1.257 dtucker 649: exit(255);
1.107 markus 650: }
651: /* Take a copy of the returned structure. */
652: pw = pwcopy(pw);
1.31 markus 653:
1.33 markus 654: /*
655: * Set our umask to something reasonable, as some files are created
656: * with the default umask. This will make them world-readable but
657: * writable only by the owner, which is ok for all files for which we
658: * don't set the modes explicitly.
659: */
1.577 djm 660: umask(022 | umask(077));
1.445 djm 661:
662: setlocale(LC_CTYPE, "");
1.31 markus 663:
1.316 djm 664: /*
665: * Initialize option structure to indicate that no values have been
666: * set.
667: */
1.31 markus 668: initialize_options(&options);
669:
1.463 djm 670: /*
671: * Prepare main ssh transport/connection structures
672: */
673: if ((ssh = ssh_alloc_session_state()) == NULL)
674: fatal("Couldn't allocate session state");
675: channel_init_channels(ssh);
676:
1.31 markus 677: /* Parse command-line arguments. */
678: host = NULL;
1.320 djm 679: use_syslog = 0;
1.375 dtucker 680: logfile = NULL;
1.325 markus 681: argv0 = av[0];
1.31 markus 682:
1.266 djm 683: again:
1.316 djm 684: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.574 djm 685: "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) { /* HUZdhjruz */
1.31 markus 686: switch (opt) {
1.91 jakob 687: case '1':
1.454 djm 688: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 689: break;
1.47 markus 690: case '2':
1.454 djm 691: /* Ignored */
1.47 markus 692: break;
1.37 markus 693: case '4':
1.196 djm 694: options.address_family = AF_INET;
1.37 markus 695: break;
696: case '6':
1.196 djm 697: options.address_family = AF_INET6;
1.37 markus 698: break;
1.31 markus 699: case 'n':
1.563 djm 700: options.stdin_null = 1;
1.31 markus 701: break;
702: case 'f':
1.564 djm 703: options.fork_after_authentication = 1;
1.563 djm 704: options.stdin_null = 1;
1.31 markus 705: break;
706: case 'x':
707: options.forward_x11 = 0;
708: break;
709: case 'X':
710: options.forward_x11 = 1;
711: break;
1.320 djm 712: case 'y':
713: use_syslog = 1;
714: break;
1.375 dtucker 715: case 'E':
1.422 dtucker 716: logfile = optarg;
1.375 dtucker 717: break;
1.408 djm 718: case 'G':
719: config_test = 1;
720: break;
1.202 markus 721: case 'Y':
722: options.forward_x11 = 1;
723: options.forward_x11_trusted = 1;
724: break;
1.31 markus 725: case 'g':
1.406 millert 726: options.fwd_opts.gateway_ports = 1;
1.31 markus 727: break;
1.229 djm 728: case 'O':
1.441 dtucker 729: if (options.stdio_forward_host != NULL)
1.332 djm 730: fatal("Cannot specify multiplexing "
731: "command with -W");
732: else if (muxclient_command != 0)
733: fatal("Multiplexing command already specified");
1.229 djm 734: if (strcmp(optarg, "check") == 0)
1.312 djm 735: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 736: else if (strcmp(optarg, "forward") == 0)
737: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 738: else if (strcmp(optarg, "exit") == 0)
1.312 djm 739: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 740: else if (strcmp(optarg, "stop") == 0)
741: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 742: else if (strcmp(optarg, "cancel") == 0)
743: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 744: else if (strcmp(optarg, "proxy") == 0)
745: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 746: else
747: fatal("Invalid multiplex command.");
748: break;
1.183 stevesk 749: case 'P': /* deprecated */
1.376 djm 750: break;
1.394 deraadt 751: case 'Q':
1.376 djm 752: cp = NULL;
1.519 dtucker 753: if (strcmp(optarg, "cipher") == 0 ||
754: strcasecmp(optarg, "Ciphers") == 0)
1.393 djm 755: cp = cipher_alg_list('\n', 0);
1.394 deraadt 756: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 757: cp = cipher_alg_list('\n', 1);
1.519 dtucker 758: else if (strcmp(optarg, "mac") == 0 ||
759: strcasecmp(optarg, "MACs") == 0)
1.392 dtucker 760: cp = mac_alg_list('\n');
1.519 dtucker 761: else if (strcmp(optarg, "kex") == 0 ||
762: strcasecmp(optarg, "KexAlgorithms") == 0)
1.392 dtucker 763: cp = kex_alg_list('\n');
1.394 deraadt 764: else if (strcmp(optarg, "key") == 0)
1.451 djm 765: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 766: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 767: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 768: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 769: cp = sshkey_alg_list(0, 1, 0, '\n');
1.519 dtucker 770: else if (strcmp(optarg, "key-sig") == 0 ||
1.547 dtucker 771: strcasecmp(optarg, "PubkeyAcceptedKeyTypes") == 0 || /* deprecated name */
772: strcasecmp(optarg, "PubkeyAcceptedAlgorithms") == 0 ||
1.519 dtucker 773: strcasecmp(optarg, "HostKeyAlgorithms") == 0 ||
1.548 dtucker 774: strcasecmp(optarg, "HostbasedKeyTypes") == 0 || /* deprecated name */
775: strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 0 || /* deprecated name */
776: strcasecmp(optarg, "HostbasedAcceptedAlgorithms") == 0)
1.519 dtucker 777: cp = sshkey_alg_list(0, 0, 1, '\n');
1.491 djm 778: else if (strcmp(optarg, "sig") == 0)
1.492 djm 779: cp = sshkey_alg_list(0, 1, 1, '\n');
1.491 djm 780: else if (strcmp(optarg, "protocol-version") == 0)
1.416 djm 781: cp = xstrdup("2");
1.513 dtucker 782: else if (strcmp(optarg, "compression") == 0) {
783: cp = xstrdup(compression_alg_list(0));
784: len = strlen(cp);
785: for (n = 0; n < len; n++)
786: if (cp[n] == ',')
787: cp[n] = '\n';
788: } else if (strcmp(optarg, "help") == 0) {
1.491 djm 789: cp = xstrdup(
1.513 dtucker 790: "cipher\ncipher-auth\ncompression\nkex\n"
1.519 dtucker 791: "key\nkey-cert\nkey-plain\nkey-sig\nmac\n"
1.491 djm 792: "protocol-version\nsig");
1.416 djm 793: }
1.376 djm 794: if (cp == NULL)
795: fatal("Unsupported query \"%s\"", optarg);
796: printf("%s\n", cp);
797: free(cp);
798: exit(0);
1.31 markus 799: break;
800: case 'a':
801: options.forward_agent = 0;
1.53 markus 802: break;
803: case 'A':
804: options.forward_agent = 1;
1.31 markus 805: break;
806: case 'k':
1.204 dtucker 807: options.gss_deleg_creds = 0;
1.297 djm 808: break;
809: case 'K':
810: options.gss_authentication = 1;
811: options.gss_deleg_creds = 1;
1.31 markus 812: break;
813: case 'i':
1.490 dtucker 814: p = tilde_expand_filename(optarg, getuid());
1.505 deraadt 815: if (stat(p, &st) == -1)
1.128 fgsch 816: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 817: "not accessible: %s.\n", p,
1.231 otto 818: strerror(errno));
1.429 dtucker 819: else
820: add_identity_file(&options, NULL, p, 1);
821: free(p);
1.31 markus 822: break;
1.127 markus 823: case 'I':
1.333 markus 824: #ifdef ENABLE_PKCS11
1.422 dtucker 825: free(options.pkcs11_provider);
1.333 markus 826: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 827: #else
1.333 markus 828: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 829: #endif
1.127 markus 830: break;
1.443 djm 831: case 'J':
1.504 djm 832: if (options.jump_host != NULL) {
833: fatal("Only a single -J option is permitted "
834: "(use commas to separate multiple "
835: "jump hops)");
836: }
1.443 djm 837: if (options.proxy_command != NULL)
838: fatal("Cannot specify -J with ProxyCommand");
839: if (parse_jump(optarg, &options, 1) == -1)
840: fatal("Invalid -J argument");
841: options.proxy_command = xstrdup("none");
842: break;
1.31 markus 843: case 't':
1.359 djm 844: if (options.request_tty == REQUEST_TTY_YES)
845: options.request_tty = REQUEST_TTY_FORCE;
846: else
847: options.request_tty = REQUEST_TTY_YES;
1.31 markus 848: break;
849: case 'v':
1.197 markus 850: if (debug_flag == 0) {
1.66 markus 851: debug_flag = 1;
852: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 853: } else {
1.443 djm 854: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
855: debug_flag++;
1.197 markus 856: options.log_level++;
1.443 djm 857: }
1.197 markus 858: }
1.375 dtucker 859: break;
1.31 markus 860: case 'V':
1.209 markus 861: fprintf(stderr, "%s, %s\n",
1.541 dtucker 862: SSH_VERSION, SSH_OPENSSL_VERSION);
1.584 ! millert 863: exit(0);
1.31 markus 864: break;
1.255 reyk 865: case 'w':
1.256 reyk 866: if (options.tun_open == -1)
867: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 868: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 869: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 870: fprintf(stderr,
871: "Bad tun device '%s'\n", optarg);
1.257 dtucker 872: exit(255);
1.255 reyk 873: }
874: break;
1.331 dtucker 875: case 'W':
1.441 dtucker 876: if (options.stdio_forward_host != NULL)
1.332 djm 877: fatal("stdio forward already specified");
878: if (muxclient_command != 0)
879: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 880: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 881: options.stdio_forward_host = fwd.listen_host;
882: options.stdio_forward_port = fwd.listen_port;
1.378 djm 883: free(fwd.connect_host);
1.331 dtucker 884: } else {
885: fprintf(stderr,
886: "Bad stdio forwarding specification '%s'\n",
887: optarg);
888: exit(255);
889: }
1.359 djm 890: options.request_tty = REQUEST_TTY_NO;
1.560 djm 891: options.session_type = SESSION_TYPE_NONE;
1.331 dtucker 892: break;
1.31 markus 893: case 'q':
894: options.log_level = SYSLOG_LEVEL_QUIET;
895: break;
896: case 'e':
897: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 898: (u_char) optarg[1] >= 64 &&
899: (u_char) optarg[1] < 128)
1.78 markus 900: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 901: else if (strlen(optarg) == 1)
1.78 markus 902: options.escape_char = (u_char) optarg[0];
1.31 markus 903: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 904: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 905: else {
1.128 fgsch 906: fprintf(stderr, "Bad escape character '%s'.\n",
907: optarg);
1.257 dtucker 908: exit(255);
1.31 markus 909: }
910: break;
911: case 'c':
1.506 naddy 912: if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
1.420 djm 913: optarg + 1 : optarg)) {
914: fprintf(stderr, "Unknown cipher type '%s'\n",
915: optarg);
916: exit(255);
1.95 markus 917: }
1.456 djm 918: free(options.ciphers);
919: options.ciphers = xstrdup(optarg);
1.95 markus 920: break;
921: case 'm':
1.422 dtucker 922: if (mac_valid(optarg)) {
923: free(options.macs);
1.95 markus 924: options.macs = xstrdup(optarg);
1.422 dtucker 925: } else {
1.128 fgsch 926: fprintf(stderr, "Unknown mac type '%s'\n",
927: optarg);
1.257 dtucker 928: exit(255);
1.31 markus 929: }
930: break;
1.214 djm 931: case 'M':
1.242 djm 932: if (options.control_master == SSHCTL_MASTER_YES)
933: options.control_master = SSHCTL_MASTER_ASK;
934: else
935: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 936: break;
1.31 markus 937: case 'p':
1.465 millert 938: if (options.port == -1) {
939: options.port = a2port(optarg);
940: if (options.port <= 0) {
941: fprintf(stderr, "Bad port '%s'\n",
942: optarg);
943: exit(255);
944: }
1.109 markus 945: }
1.31 markus 946: break;
947: case 'l':
1.465 millert 948: if (options.user == NULL)
949: options.user = optarg;
1.31 markus 950: break;
1.141 stevesk 951:
952: case 'L':
1.324 djm 953: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 954: add_local_forward(&options, &fwd);
955: else {
1.128 fgsch 956: fprintf(stderr,
1.232 djm 957: "Bad local forwarding specification '%s'\n",
1.128 fgsch 958: optarg);
1.257 dtucker 959: exit(255);
1.31 markus 960: }
1.232 djm 961: break;
962:
963: case 'R':
1.464 markus 964: if (parse_forward(&fwd, optarg, 0, 1) ||
965: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 966: add_remote_forward(&options, &fwd);
967: } else {
1.128 fgsch 968: fprintf(stderr,
1.232 djm 969: "Bad remote forwarding specification "
970: "'%s'\n", optarg);
1.257 dtucker 971: exit(255);
1.31 markus 972: }
973: break;
1.108 markus 974:
975: case 'D':
1.324 djm 976: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 977: add_local_forward(&options, &fwd);
1.232 djm 978: } else {
1.322 stevesk 979: fprintf(stderr,
980: "Bad dynamic forwarding specification "
981: "'%s'\n", optarg);
1.257 dtucker 982: exit(255);
1.109 markus 983: }
1.108 markus 984: break;
985:
1.31 markus 986: case 'C':
1.513 dtucker 987: #ifdef WITH_ZLIB
1.31 markus 988: options.compression = 1;
1.513 dtucker 989: #else
990: error("Compression not supported, disabling.");
991: #endif
1.31 markus 992: break;
1.45 markus 993: case 'N':
1.560 djm 994: if (options.session_type != -1 &&
995: options.session_type != SESSION_TYPE_NONE)
996: fatal("Cannot specify -N with -s/SessionType");
997: options.session_type = SESSION_TYPE_NONE;
1.359 djm 998: options.request_tty = REQUEST_TTY_NO;
1.45 markus 999: break;
1000: case 'T':
1.359 djm 1001: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1002: break;
1.31 markus 1003: case 'o':
1.205 markus 1004: line = xstrdup(optarg);
1.408 djm 1005: if (process_config_line(&options, pw,
1006: host ? host : "", host ? host : "", line,
1007: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 1008: exit(255);
1.378 djm 1009: free(line);
1.31 markus 1010: break;
1.85 djm 1011: case 's':
1.560 djm 1012: if (options.session_type != -1 &&
1013: options.session_type != SESSION_TYPE_SUBSYSTEM)
1014: fatal("Cannot specify -s with -N/SessionType");
1015: options.session_type = SESSION_TYPE_SUBSYSTEM;
1.117 markus 1016: break;
1.214 djm 1017: case 'S':
1.431 mmcc 1018: free(options.control_path);
1.214 djm 1019: options.control_path = xstrdup(optarg);
1020: break;
1.117 markus 1021: case 'b':
1022: options.bind_address = optarg;
1.474 djm 1023: break;
1024: case 'B':
1025: options.bind_interface = optarg;
1.85 djm 1026: break;
1.139 markus 1027: case 'F':
1028: config = optarg;
1029: break;
1.31 markus 1030: default:
1031: usage();
1.1 deraadt 1032: }
1.31 markus 1033: }
1034:
1.462 djm 1035: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
1036: opt_terminated = 1;
1037:
1.128 fgsch 1038: ac -= optind;
1039: av += optind;
1040:
1.329 guenther 1041: if (ac > 0 && !host) {
1.465 millert 1042: int tport;
1043: char *tuser;
1044: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
1045: case -1:
1046: usage();
1047: break;
1048: case 0:
1049: if (options.user == NULL) {
1050: options.user = tuser;
1051: tuser = NULL;
1052: }
1053: free(tuser);
1054: if (options.port == -1 && tport != -1)
1055: options.port = tport;
1056: break;
1057: default:
1.128 fgsch 1058: p = xstrdup(*av);
1.188 markus 1059: cp = strrchr(p, '@');
1.465 millert 1060: if (cp != NULL) {
1061: if (cp == p)
1062: usage();
1063: if (options.user == NULL) {
1064: options.user = p;
1065: p = NULL;
1066: }
1067: *cp++ = '\0';
1068: host = xstrdup(cp);
1069: free(p);
1070: } else
1071: host = p;
1072: break;
1073: }
1.462 djm 1074: if (ac > 1 && !opt_terminated) {
1.189 millert 1075: optind = optreset = 1;
1.128 fgsch 1076: goto again;
1077: }
1.189 millert 1078: ac--, av++;
1.128 fgsch 1079: }
1080:
1.31 markus 1081: /* Check that we got a host name. */
1082: if (!host)
1083: usage();
1084:
1.583 dtucker 1085: options.host_arg = xstrdup(host);
1.385 djm 1086:
1.402 markus 1087: #ifdef WITH_OPENSSL
1.350 djm 1088: OpenSSL_add_all_algorithms();
1.72 markus 1089: ERR_load_crypto_strings();
1.402 markus 1090: #endif
1.31 markus 1091:
1092: /* Initialize the command to execute on remote host. */
1.482 markus 1093: if ((command = sshbuf_new()) == NULL)
1094: fatal("sshbuf_new failed");
1.1 deraadt 1095:
1.33 markus 1096: /*
1097: * Save the command to execute on the remote host in a buffer. There
1098: * is no limit on the length of the command, except by the maximum
1099: * packet size. Also sets the tty flag if there is no command.
1100: */
1.128 fgsch 1101: if (!ac) {
1.31 markus 1102: /* No command specified - execute shell on a tty. */
1.560 djm 1103: if (options.session_type == SESSION_TYPE_SUBSYSTEM) {
1.128 fgsch 1104: fprintf(stderr,
1105: "You must specify a subsystem to invoke.\n");
1.85 djm 1106: usage();
1107: }
1.31 markus 1108: } else {
1.128 fgsch 1109: /* A command has been specified. Store it into the buffer. */
1110: for (i = 0; i < ac; i++) {
1.482 markus 1111: if ((r = sshbuf_putf(command, "%s%s",
1112: i ? " " : "", av[i])) != 0)
1.540 djm 1113: fatal_fr(r, "buffer error");
1.31 markus 1114: }
1115: }
1116:
1.575 djm 1117: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1118:
1.101 markus 1119: /*
1120: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1121: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1122: */
1.375 dtucker 1123: if (use_syslog && logfile != NULL)
1124: fatal("Can't specify both -y and -E");
1.422 dtucker 1125: if (logfile != NULL)
1.375 dtucker 1126: log_redirect_stderr_to(logfile);
1.325 markus 1127: log_init(argv0,
1.468 djm 1128: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1129: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1130: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1131: SYSLOG_FACILITY_USER : options.log_facility,
1132: !use_syslog);
1.375 dtucker 1133:
1134: if (debug_flag)
1.541 dtucker 1135: logit("%s, %s", SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 1136:
1.400 djm 1137: /* Parse the configuration files */
1.583 dtucker 1138: process_config_files(options.host_arg, pw, 0, &want_final_pass);
1.496 djm 1139: if (want_final_pass)
1140: debug("configuration requests final Match pass");
1.400 djm 1141:
1142: /* Hostname canonicalisation needs a few options filled. */
1143: fill_default_options_for_canonicalization(&options);
1144:
1145: /* If the user has replaced the hostname then take it into use now */
1146: if (options.hostname != NULL) {
1147: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1148: cp = percent_expand(options.hostname,
1149: "h", host, (char *)NULL);
1150: free(host);
1151: host = cp;
1.408 djm 1152: free(options.hostname);
1153: options.hostname = xstrdup(host);
1.400 djm 1154: }
1155:
1.470 djm 1156: /* Don't lowercase addresses, they will be explicitly canonicalised */
1157: if ((was_addr = is_addr(host)) == 0)
1158: lowercase(host);
1159:
1160: /*
1161: * Try to canonicalize if requested by configuration or the
1162: * hostname is an address.
1163: */
1164: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1165: addrs = resolve_canonicalize(&host, options.port);
1166:
1.139 markus 1167: /*
1.401 djm 1168: * If CanonicalizePermittedCNAMEs have been specified but
1169: * other canonicalization did not happen (by not being requested
1170: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1171: * as a result of CNAME following.
1.401 djm 1172: *
1173: * Try to resolve the bare hostname name using the system resolver's
1174: * usual search rules and then apply the CNAME follow rules.
1175: *
1176: * Skip the lookup if a ProxyCommand is being used unless the user
1177: * has specifically requested canonicalisation for this case via
1178: * CanonicalizeHostname=always
1.139 markus 1179: */
1.443 djm 1180: direct = option_clear_or_none(options.proxy_command) &&
1181: options.jump_host == NULL;
1.568 djm 1182: if (addrs == NULL && config_has_permitted_cnames(&options) && (direct ||
1.443 djm 1183: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1184: if ((addrs = resolve_host(host, options.port,
1.493 djm 1185: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1186: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1187: if (direct)
1.403 djm 1188: cleanup_exit(255); /* logged in resolve_host */
1189: } else
1.443 djm 1190: check_follow_cname(direct, &host, cname);
1.400 djm 1191: }
1.139 markus 1192:
1.400 djm 1193: /*
1.408 djm 1194: * If canonicalisation is enabled then re-parse the configuration
1195: * files as new stanzas may match.
1.400 djm 1196: */
1.496 djm 1197: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1198: debug("hostname canonicalisation enabled, "
1199: "will re-parse configuration");
1200: want_final_pass = 1;
1201: }
1202:
1203: if (want_final_pass) {
1204: debug("re-parsing configuration");
1.408 djm 1205: free(options.hostname);
1206: options.hostname = xstrdup(host);
1.583 dtucker 1207: process_config_files(options.host_arg, pw, 1, NULL);
1.408 djm 1208: /*
1209: * Address resolution happens early with canonicalisation
1210: * enabled and the port number may have changed since, so
1211: * reset it in address list
1212: */
1213: if (addrs != NULL && options.port > 0)
1214: set_addrinfo_port(addrs, options.port);
1.139 markus 1215: }
1.31 markus 1216:
1217: /* Fill configuration defaults. */
1.543 djm 1218: if (fill_default_options(&options) != 0)
1219: cleanup_exit(255);
1.443 djm 1220:
1.534 dtucker 1221: if (options.user == NULL)
1222: options.user = xstrdup(pw->pw_name);
1223:
1.443 djm 1224: /*
1225: * If ProxyJump option specified, then construct a ProxyCommand now.
1226: */
1227: if (options.jump_host != NULL) {
1228: char port_s[8];
1.534 dtucker 1229: const char *jumpuser = options.jump_user, *sshbin = argv0;
1.520 dtucker 1230: int port = options.port, jumpport = options.jump_port;
1231:
1232: if (port <= 0)
1233: port = default_ssh_port();
1234: if (jumpport <= 0)
1235: jumpport = default_ssh_port();
1.534 dtucker 1236: if (jumpuser == NULL)
1237: jumpuser = options.user;
1238: if (strcmp(options.jump_host, host) == 0 && port == jumpport &&
1239: strcmp(options.user, jumpuser) == 0)
1.520 dtucker 1240: fatal("jumphost loop via %s", options.jump_host);
1.478 djm 1241:
1242: /*
1243: * Try to use SSH indicated by argv[0], but fall back to
1244: * "ssh" if it appears unavailable.
1245: */
1246: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1247: sshbin = "ssh";
1.443 djm 1248:
1249: /* Consistency check */
1250: if (options.proxy_command != NULL)
1251: fatal("inconsistent options: ProxyCommand+ProxyJump");
1252: /* Never use FD passing for ProxyJump */
1253: options.proxy_use_fdpass = 0;
1254: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1255: xasprintf(&options.proxy_command,
1.478 djm 1256: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1257: sshbin,
1.443 djm 1258: /* Optional "-l user" argument if jump_user set */
1259: options.jump_user == NULL ? "" : " -l ",
1260: options.jump_user == NULL ? "" : options.jump_user,
1261: /* Optional "-p port" argument if jump_port set */
1262: options.jump_port <= 0 ? "" : " -p ",
1263: options.jump_port <= 0 ? "" : port_s,
1264: /* Optional additional jump hosts ",..." */
1265: options.jump_extra == NULL ? "" : " -J ",
1266: options.jump_extra == NULL ? "" : options.jump_extra,
1.571 jsg 1267: /* Optional "-F" argument if -F specified */
1.443 djm 1268: config == NULL ? "" : " -F ",
1269: config == NULL ? "" : config,
1270: /* Optional "-v" arguments if -v set */
1271: debug_flag ? " -" : "",
1272: debug_flag, "vvv",
1273: /* Mandatory hostname */
1274: options.jump_host);
1275: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1276: options.proxy_command);
1277: }
1.31 markus 1278:
1.400 djm 1279: if (options.port == 0)
1280: options.port = default_ssh_port();
1.463 djm 1281: channel_set_af(ssh, options.address_family);
1.196 djm 1282:
1.383 djm 1283: /* Tidy and check options */
1284: if (options.host_key_alias != NULL)
1285: lowercase(options.host_key_alias);
1286: if (options.proxy_command != NULL &&
1287: strcmp(options.proxy_command, "-") == 0 &&
1288: options.proxy_use_fdpass)
1289: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.516 markus 1290: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1291: if (options.control_persist && options.control_path != NULL) {
1292: debug("UpdateHostKeys=ask is incompatible with "
1293: "ControlPersist; disabling");
1294: options.update_hostkeys = 0;
1295: } else if (sshbuf_len(command) != 0 ||
1296: options.remote_command != NULL ||
1297: options.request_tty == REQUEST_TTY_NO) {
1298: debug("UpdateHostKeys=ask is incompatible with "
1299: "remote command execution; disabling");
1.517 djm 1300: options.update_hostkeys = 0;
1301: } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1302: /* no point logging anything; user won't see it */
1.516 markus 1303: options.update_hostkeys = 0;
1304: }
1.415 djm 1305: }
1.430 djm 1306: if (options.connection_attempts <= 0)
1307: fatal("Invalid number of ConnectionAttempts");
1308:
1.482 markus 1309: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1310: fatal("Cannot execute command-line and remote command.");
1311:
1312: /* Cannot fork to background if no command. */
1.564 djm 1313: if (options.fork_after_authentication && sshbuf_len(command) == 0 &&
1.562 djm 1314: options.remote_command == NULL &&
1315: options.session_type != SESSION_TYPE_NONE)
1.461 bluhm 1316: fatal("Cannot fork into background without a command "
1317: "to execute.");
1318:
1.31 markus 1319: /* reinit */
1.452 dtucker 1320: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.559 djm 1321: for (j = 0; j < options.num_log_verbose; j++) {
1322: if (strcasecmp(options.log_verbose[j], "none") == 0)
1323: break;
1.539 djm 1324: log_verbose_add(options.log_verbose[j]);
1.559 djm 1325: }
1.370 djm 1326:
1327: if (options.request_tty == REQUEST_TTY_YES ||
1328: options.request_tty == REQUEST_TTY_FORCE)
1329: tty_flag = 1;
1330:
1331: /* Allocate a tty by default if no command specified. */
1.482 markus 1332: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1333: tty_flag = options.request_tty != REQUEST_TTY_NO;
1334:
1335: /* Force no tty */
1.447 markus 1336: if (options.request_tty == REQUEST_TTY_NO ||
1.570 djm 1337: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY) ||
1338: options.session_type == SESSION_TYPE_NONE)
1.370 djm 1339: tty_flag = 0;
1340: /* Do not allocate a tty if stdin is not a tty. */
1.563 djm 1341: if ((!isatty(fileno(stdin)) || options.stdin_null) &&
1.370 djm 1342: options.request_tty != REQUEST_TTY_FORCE) {
1343: if (tty_flag)
1344: logit("Pseudo-terminal will not be allocated because "
1345: "stdin is not a terminal.");
1346: tty_flag = 0;
1347: }
1.343 djm 1348:
1.466 djm 1349: /* Set up strings used to percent_expand() arguments */
1.544 djm 1350: cinfo = xcalloc(1, sizeof(*cinfo));
1.358 djm 1351: if (gethostname(thishost, sizeof(thishost)) == -1)
1352: fatal("gethostname: %s", strerror(errno));
1.544 djm 1353: cinfo->thishost = xstrdup(thishost);
1354: thishost[strcspn(thishost, ".")] = '\0';
1355: cinfo->shorthost = xstrdup(thishost);
1356: xasprintf(&cinfo->portstr, "%d", options.port);
1357: xasprintf(&cinfo->uidstr, "%llu",
1.479 djm 1358: (unsigned long long)pw->pw_uid);
1.544 djm 1359: cinfo->keyalias = xstrdup(options.host_key_alias ?
1.583 dtucker 1360: options.host_key_alias : options.host_arg);
1.544 djm 1361: cinfo->conn_hash_hex = ssh_connection_hash(cinfo->thishost, host,
1362: cinfo->portstr, options.user);
1.583 dtucker 1363: cinfo->host_arg = xstrdup(options.host_arg);
1.544 djm 1364: cinfo->remhost = xstrdup(host);
1365: cinfo->remuser = xstrdup(options.user);
1366: cinfo->homedir = xstrdup(pw->pw_dir);
1367: cinfo->locuser = xstrdup(pw->pw_name);
1.405 djm 1368:
1.466 djm 1369: /*
1370: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1371: * after port-forwarding is set up, so it may pick up any local
1372: * tunnel interface name allocated.
1373: */
1.461 bluhm 1374: if (options.remote_command != NULL) {
1375: debug3("expanding RemoteCommand: %s", options.remote_command);
1376: cp = options.remote_command;
1.527 dtucker 1377: options.remote_command = default_client_percent_expand(cp,
1.544 djm 1378: cinfo);
1.461 bluhm 1379: debug3("expanded RemoteCommand: %s", options.remote_command);
1380: free(cp);
1.482 markus 1381: if ((r = sshbuf_put(command, options.remote_command,
1382: strlen(options.remote_command))) != 0)
1.540 djm 1383: fatal_fr(r, "buffer error");
1.304 dtucker 1384: }
1.31 markus 1385:
1.214 djm 1386: if (options.control_path != NULL) {
1.490 dtucker 1387: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1388: free(options.control_path);
1.528 dtucker 1389: options.control_path = default_client_percent_dollar_expand(cp,
1.544 djm 1390: cinfo);
1.378 djm 1391: free(cp);
1.214 djm 1392: }
1.408 djm 1393:
1.522 dtucker 1394: if (options.identity_agent != NULL) {
1395: p = tilde_expand_filename(options.identity_agent, getuid());
1.544 djm 1396: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1397: free(p);
1398: free(options.identity_agent);
1399: options.identity_agent = cp;
1400: }
1401:
1402: if (options.forward_agent_sock_path != NULL) {
1403: p = tilde_expand_filename(options.forward_agent_sock_path,
1404: getuid());
1.544 djm 1405: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1406: free(p);
1407: free(options.forward_agent_sock_path);
1408: options.forward_agent_sock_path = cp;
1.552 djm 1409: if (stat(options.forward_agent_sock_path, &st) != 0) {
1410: error("Cannot forward agent socket path \"%s\": %s",
1411: options.forward_agent_sock_path, strerror(errno));
1412: if (options.exit_on_forward_failure)
1413: cleanup_exit(255);
1414: }
1.532 dtucker 1415: }
1416:
1.545 djm 1417: if (options.num_system_hostfiles > 0 &&
1418: strcasecmp(options.system_hostfiles[0], "none") == 0) {
1419: if (options.num_system_hostfiles > 1)
1420: fatal("Invalid GlobalKnownHostsFiles: \"none\" "
1421: "appears with other entries");
1422: free(options.system_hostfiles[0]);
1423: options.system_hostfiles[0] = NULL;
1424: options.num_system_hostfiles = 0;
1425: }
1426:
1427: if (options.num_user_hostfiles > 0 &&
1428: strcasecmp(options.user_hostfiles[0], "none") == 0) {
1429: if (options.num_user_hostfiles > 1)
1430: fatal("Invalid UserKnownHostsFiles: \"none\" "
1431: "appears with other entries");
1432: free(options.user_hostfiles[0]);
1433: options.user_hostfiles[0] = NULL;
1434: options.num_user_hostfiles = 0;
1435: }
1.532 dtucker 1436: for (j = 0; j < options.num_user_hostfiles; j++) {
1.545 djm 1437: if (options.user_hostfiles[j] == NULL)
1438: continue;
1439: cp = tilde_expand_filename(options.user_hostfiles[j], getuid());
1440: p = default_client_percent_dollar_expand(cp, cinfo);
1441: if (strcmp(options.user_hostfiles[j], p) != 0)
1442: debug3("expanded UserKnownHostsFile '%s' -> "
1443: "'%s'", options.user_hostfiles[j], p);
1444: free(options.user_hostfiles[j]);
1445: free(cp);
1446: options.user_hostfiles[j] = p;
1.522 dtucker 1447: }
1448:
1.527 dtucker 1449: for (i = 0; i < options.num_local_forwards; i++) {
1450: if (options.local_forwards[i].listen_path != NULL) {
1451: cp = options.local_forwards[i].listen_path;
1452: p = options.local_forwards[i].listen_path =
1.544 djm 1453: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1454: if (strcmp(cp, p) != 0)
1455: debug3("expanded LocalForward listen path "
1456: "'%s' -> '%s'", cp, p);
1457: free(cp);
1458: }
1459: if (options.local_forwards[i].connect_path != NULL) {
1460: cp = options.local_forwards[i].connect_path;
1461: p = options.local_forwards[i].connect_path =
1.544 djm 1462: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1463: if (strcmp(cp, p) != 0)
1464: debug3("expanded LocalForward connect path "
1465: "'%s' -> '%s'", cp, p);
1466: free(cp);
1467: }
1468: }
1469:
1470: for (i = 0; i < options.num_remote_forwards; i++) {
1471: if (options.remote_forwards[i].listen_path != NULL) {
1472: cp = options.remote_forwards[i].listen_path;
1473: p = options.remote_forwards[i].listen_path =
1.544 djm 1474: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1475: if (strcmp(cp, p) != 0)
1476: debug3("expanded RemoteForward listen path "
1477: "'%s' -> '%s'", cp, p);
1478: free(cp);
1479: }
1480: if (options.remote_forwards[i].connect_path != NULL) {
1481: cp = options.remote_forwards[i].connect_path;
1482: p = options.remote_forwards[i].connect_path =
1.544 djm 1483: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1484: if (strcmp(cp, p) != 0)
1485: debug3("expanded RemoteForward connect path "
1486: "'%s' -> '%s'", cp, p);
1487: free(cp);
1488: }
1489: }
1490:
1.408 djm 1491: if (config_test) {
1492: dump_client_config(&options, host);
1493: exit(0);
1.508 djm 1494: }
1495:
1496: /* Expand SecurityKeyProvider if it refers to an environment variable */
1497: if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1498: strlen(options.sk_provider) > 1) {
1499: if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1.518 naddy 1500: debug("Authenticator provider %s did not resolve; "
1.508 djm 1501: "disabling", options.sk_provider);
1502: free(options.sk_provider);
1503: options.sk_provider = NULL;
1504: } else {
1505: debug2("resolved SecurityKeyProvider %s => %s",
1506: options.sk_provider, cp);
1507: free(options.sk_provider);
1508: options.sk_provider = xstrdup(cp);
1509: }
1.408 djm 1510: }
1.405 djm 1511:
1.312 djm 1512: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1513: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1514: if (options.control_path != NULL) {
1515: int sock;
1516: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1517: ssh_packet_set_connection(ssh, sock, sock);
1.499 djm 1518: ssh_packet_set_mux(ssh);
1.447 markus 1519: goto skip_connect;
1520: }
1521: }
1.401 djm 1522:
1523: /*
1524: * If hostname canonicalisation was not enabled, then we may not
1525: * have yet resolved the hostname. Do so now.
1526: */
1527: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1528: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1529: if ((addrs = resolve_host(host, options.port, 1,
1530: cname, sizeof(cname))) == NULL)
1531: cleanup_exit(255); /* resolve_host logs the error */
1532: }
1.214 djm 1533:
1.542 dtucker 1534: if (options.connection_timeout >= INT_MAX/1000)
1535: timeout_ms = INT_MAX;
1536: else
1537: timeout_ms = options.connection_timeout * 1000;
1.303 djm 1538:
1.77 markus 1539: /* Open a connection to the remote host. */
1.583 dtucker 1540: if (ssh_connect(ssh, host, options.host_arg, addrs, &hostaddr,
1541: options.port, options.connection_attempts,
1.488 dtucker 1542: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1543: exit(255);
1.31 markus 1544:
1.391 djm 1545: if (addrs != NULL)
1546: freeaddrinfo(addrs);
1547:
1.499 djm 1548: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1549: options.server_alive_count_max);
1550:
1.303 djm 1551: if (timeout_ms > 0)
1552: debug3("timeout: %d ms remain after connect", timeout_ms);
1553:
1.33 markus 1554: /*
1.485 dtucker 1555: * If we successfully made the connection and we have hostbased auth
1556: * enabled, load the public keys so we can later use the ssh-keysign
1557: * helper to sign challenges.
1.33 markus 1558: */
1.112 markus 1559: sensitive_data.nkeys = 0;
1560: sensitive_data.keys = NULL;
1.457 djm 1561: if (options.hostbased_authentication) {
1.581 dtucker 1562: int loaded = 0;
1563:
1.486 dtucker 1564: sensitive_data.nkeys = 10;
1.274 deraadt 1565: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.578 jsg 1566: sizeof(*sensitive_data.keys));
1.483 markus 1567:
1568: /* XXX check errors? */
1.486 dtucker 1569: #define L_PUBKEY(p,o) do { \
1570: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1571: fatal_f("pubkey out of array bounds"); \
1.483 markus 1572: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.576 djm 1573: &(sensitive_data.keys[o]), p, "pubkey"); \
1.581 dtucker 1574: if (sensitive_data.keys[o] != NULL) { \
1.572 djm 1575: debug2("hostbased key %d: %s key from \"%s\"", o, \
1576: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.581 dtucker 1577: loaded++; \
1578: } \
1.486 dtucker 1579: } while (0)
1580: #define L_CERT(p,o) do { \
1581: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1582: fatal_f("cert out of array bounds"); \
1.576 djm 1583: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), \
1584: &(sensitive_data.keys[o]), p, "cert"); \
1.581 dtucker 1585: if (sensitive_data.keys[o] != NULL) { \
1.572 djm 1586: debug2("hostbased key %d: %s cert from \"%s\"", o, \
1587: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.581 dtucker 1588: loaded++; \
1589: } \
1.486 dtucker 1590: } while (0)
1.177 markus 1591:
1.485 dtucker 1592: if (options.hostbased_authentication == 1) {
1.486 dtucker 1593: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1594: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1595: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1596: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1597: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1598: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1599: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1600: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1601: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1602: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.581 dtucker 1603: if (loaded == 0)
1604: debug("HostbasedAuthentication enabled but no "
1605: "local public host keys could be loaded.");
1.173 markus 1606: }
1.367 djm 1607: }
1.31 markus 1608:
1.104 markus 1609: /* load options.identity_files */
1.544 djm 1610: load_public_identity_files(cinfo);
1.439 markus 1611:
1.476 djm 1612: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1613: if (options.identity_agent &&
1614: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1615: if (strcmp(options.identity_agent, "none") == 0) {
1616: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1617: } else {
1.522 dtucker 1618: cp = options.identity_agent;
1.528 dtucker 1619: /* legacy (limited) format */
1620: if (cp[0] == '$' && cp[1] != '{') {
1.494 djm 1621: if (!valid_env_name(cp + 1)) {
1622: fatal("Invalid IdentityAgent "
1623: "environment variable name %s", cp);
1624: }
1625: if ((p = getenv(cp + 1)) == NULL)
1626: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1627: else
1628: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1629: } else {
1630: /* identity_agent specifies a path directly */
1631: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1632: }
1.510 djm 1633: }
1634: }
1635:
1.522 dtucker 1636: if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1.526 djm 1637: cp = options.forward_agent_sock_path;
1.510 djm 1638: if (cp[0] == '$') {
1639: if (!valid_env_name(cp + 1)) {
1640: fatal("Invalid ForwardAgent environment variable name %s", cp);
1641: }
1642: if ((p = getenv(cp + 1)) != NULL)
1.566 dtucker 1643: forward_agent_sock_path = xstrdup(p);
1.510 djm 1644: else
1645: options.forward_agent = 0;
1646: free(cp);
1647: } else {
1648: forward_agent_sock_path = cp;
1.439 markus 1649: }
1650: }
1.104 markus 1651:
1652: /* Expand ~ in known host file names. */
1.361 djm 1653: tilde_expand_paths(options.system_hostfiles,
1654: options.num_system_hostfiles);
1655: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1656:
1.512 dtucker 1657: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1658:
1.316 djm 1659: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1660: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.546 djm 1661: options.port, pw, timeout_ms, cinfo);
1.31 markus 1662:
1.112 markus 1663: /* We no longer need the private host keys. Clear them now. */
1664: if (sensitive_data.nkeys != 0) {
1665: for (i = 0; i < sensitive_data.nkeys; i++) {
1666: if (sensitive_data.keys[i] != NULL) {
1667: /* Destroys contents safely */
1668: debug3("clear hostkey %d", i);
1.483 markus 1669: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1670: sensitive_data.keys[i] = NULL;
1671: }
1672: }
1.378 djm 1673: free(sensitive_data.keys);
1.134 markus 1674: }
1675: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1676: free(options.identity_files[i]);
1677: options.identity_files[i] = NULL;
1.134 markus 1678: if (options.identity_keys[i]) {
1.483 markus 1679: sshkey_free(options.identity_keys[i]);
1.134 markus 1680: options.identity_keys[i] = NULL;
1681: }
1.112 markus 1682: }
1.426 djm 1683: for (i = 0; i < options.num_certificate_files; i++) {
1684: free(options.certificate_files[i]);
1685: options.certificate_files[i] = NULL;
1686: }
1.553 djm 1687:
1688: #ifdef ENABLE_PKCS11
1689: (void)pkcs11_del_provider(options.pkcs11_provider);
1690: #endif
1.31 markus 1691:
1.447 markus 1692: skip_connect:
1.544 djm 1693: exit_status = ssh_session2(ssh, cinfo);
1694: ssh_conn_info_free(cinfo);
1.499 djm 1695: ssh_packet_close(ssh);
1.186 djm 1696:
1.312 djm 1697: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1698: unlink(options.control_path);
1699:
1.353 djm 1700: /* Kill ProxyCommand if it is running. */
1701: ssh_kill_proxy_command();
1.186 djm 1702:
1.45 markus 1703: return exit_status;
1704: }
1705:
1.344 djm 1706: static void
1707: control_persist_detach(void)
1708: {
1709: pid_t pid;
1710:
1.540 djm 1711: debug_f("backgrounding master process");
1.344 djm 1712:
1.473 djm 1713: /*
1714: * master (current process) into the background, and make the
1715: * foreground process a client of the backgrounded master.
1716: */
1.344 djm 1717: switch ((pid = fork())) {
1718: case -1:
1.540 djm 1719: fatal_f("fork: %s", strerror(errno));
1.344 djm 1720: case 0:
1721: /* Child: master process continues mainloop */
1.473 djm 1722: break;
1723: default:
1.531 djm 1724: /* Parent: set up mux client to connect to backgrounded master */
1.540 djm 1725: debug2_f("background process is %ld", (long)pid);
1.563 djm 1726: options.stdin_null = ostdin_null_flag;
1.359 djm 1727: options.request_tty = orequest_tty;
1.344 djm 1728: tty_flag = otty_flag;
1.561 djm 1729: options.session_type = osession_type;
1.473 djm 1730: close(muxserver_sock);
1731: muxserver_sock = -1;
1.351 markus 1732: options.control_master = SSHCTL_MASTER_NO;
1.473 djm 1733: muxclient(options.control_path);
1.344 djm 1734: /* muxclient() doesn't return on success. */
1.473 djm 1735: fatal("Failed to connect to new control master");
1736: }
1.537 djm 1737: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1738: error_f("stdfd_devnull failed");
1.381 djm 1739: daemon(1, 1);
1.362 djm 1740: setproctitle("%s [mux]", options.control_path);
1.344 djm 1741: }
1742:
1743: /* Do fork() after authentication. Used by "ssh -f" */
1744: static void
1745: fork_postauth(void)
1746: {
1747: if (need_controlpersist_detach)
1748: control_persist_detach();
1749: debug("forking to background");
1.564 djm 1750: options.fork_after_authentication = 0;
1.505 deraadt 1751: if (daemon(1, 1) == -1)
1.344 djm 1752: fatal("daemon() failed: %.200s", strerror(errno));
1.537 djm 1753: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1754: error_f("stdfd_devnull failed");
1.344 djm 1755: }
1756:
1.523 djm 1757: static void
1758: forwarding_success(void)
1759: {
1.524 djm 1760: if (forward_confirms_pending == -1)
1761: return;
1762: if (--forward_confirms_pending == 0) {
1.540 djm 1763: debug_f("all expected forwarding replies received");
1.564 djm 1764: if (options.fork_after_authentication)
1.523 djm 1765: fork_postauth();
1.524 djm 1766: } else {
1.540 djm 1767: debug2_f("%d expected forwarding replies remaining",
1768: forward_confirms_pending);
1.523 djm 1769: }
1770: }
1771:
1.315 djm 1772: /* Callback for remote forward global requests */
1773: static void
1.463 djm 1774: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1775: {
1.406 millert 1776: struct Forward *rfwd = (struct Forward *)ctxt;
1.499 djm 1777: u_int port;
1778: int r;
1.315 djm 1779:
1.324 djm 1780: /* XXX verbose() on failure? */
1.404 markus 1781: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1782: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1783: rfwd->listen_path ? rfwd->listen_path :
1784: rfwd->listen_host ? rfwd->listen_host : "",
1785: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1786: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1787: rfwd->connect_host, rfwd->connect_port);
1788: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1789: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1.499 djm 1790: if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1.540 djm 1791: fatal_fr(r, "parse packet");
1.499 djm 1792: if (port > 65535) {
1793: error("Invalid allocated port %u for remote "
1794: "forward to %s:%d", port,
1795: rfwd->connect_host, rfwd->connect_port);
1796: /* Ensure failure processing runs below */
1797: type = SSH2_MSG_REQUEST_FAILURE;
1798: channel_update_permission(ssh,
1799: rfwd->handle, -1);
1800: } else {
1801: rfwd->allocated_port = (int)port;
1802: logit("Allocated port %u for remote "
1803: "forward to %s:%d",
1.569 dtucker 1804: rfwd->allocated_port, rfwd->connect_path ?
1805: rfwd->connect_path : rfwd->connect_host,
1.499 djm 1806: rfwd->connect_port);
1807: channel_update_permission(ssh,
1808: rfwd->handle, rfwd->allocated_port);
1809: }
1.366 markus 1810: } else {
1.480 djm 1811: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1812: }
1.324 djm 1813: }
1.468 djm 1814:
1.315 djm 1815: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1816: if (options.exit_on_forward_failure) {
1817: if (rfwd->listen_path != NULL)
1818: fatal("Error: remote port forwarding failed "
1819: "for listen path %s", rfwd->listen_path);
1820: else
1821: fatal("Error: remote port forwarding failed "
1822: "for listen port %d", rfwd->listen_port);
1823: } else {
1824: if (rfwd->listen_path != NULL)
1825: logit("Warning: remote port forwarding failed "
1826: "for listen path %s", rfwd->listen_path);
1827: else
1828: logit("Warning: remote port forwarding failed "
1829: "for listen port %d", rfwd->listen_port);
1830: }
1.315 djm 1831: }
1.523 djm 1832: forwarding_success();
1.315 djm 1833: }
1834:
1.126 itojun 1835: static void
1.582 djm 1836: client_cleanup_stdio_fwd(struct ssh *ssh, int id, int force, void *arg)
1.331 dtucker 1837: {
1838: debug("stdio forwarding: done");
1839: cleanup_exit(0);
1840: }
1841:
1.368 djm 1842: static void
1.463 djm 1843: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1844: {
1845: if (!success)
1846: fatal("stdio forwarding failed");
1847: }
1848:
1849: static void
1.523 djm 1850: ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
1851: {
1852: if (!success) {
1853: error("Tunnel forwarding failed");
1854: if (options.exit_on_forward_failure)
1855: cleanup_exit(255);
1856: }
1857:
1.540 djm 1858: debug_f("tunnel forward established, id=%d", id);
1.523 djm 1859: forwarding_success();
1860: }
1861:
1862: static void
1.463 djm 1863: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1864: {
1865: Channel *c;
1.332 djm 1866: int in, out;
1.331 dtucker 1867:
1.441 dtucker 1868: if (options.stdio_forward_host == NULL)
1.368 djm 1869: return;
1870:
1.540 djm 1871: debug3_f("%s:%d", options.stdio_forward_host,
1.441 dtucker 1872: options.stdio_forward_port);
1.332 djm 1873:
1.505 deraadt 1874: if ((in = dup(STDIN_FILENO)) == -1 ||
1875: (out = dup(STDOUT_FILENO)) == -1)
1.557 djm 1876: fatal_f("dup() in/out failed");
1.463 djm 1877: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.557 djm 1878: options.stdio_forward_port, in, out,
1879: CHANNEL_NONBLOCK_STDIO)) == NULL)
1.540 djm 1880: fatal_f("channel_connect_stdio_fwd failed");
1.463 djm 1881: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1882: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1883: }
1884:
1885: static void
1.551 markus 1886: ssh_init_forward_permissions(struct ssh *ssh, const char *what, char **opens,
1887: u_int num_opens)
1888: {
1889: u_int i;
1890: int port;
1.573 dtucker 1891: char *addr, *arg, *oarg;
1.551 markus 1892: int where = FORWARD_LOCAL;
1893:
1894: channel_clear_permission(ssh, FORWARD_ADM, where);
1895: if (num_opens == 0)
1896: return; /* permit any */
1897:
1898: /* handle keywords: "any" / "none" */
1899: if (num_opens == 1 && strcmp(opens[0], "any") == 0)
1900: return;
1901: if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
1902: channel_disable_admin(ssh, where);
1903: return;
1904: }
1905: /* Otherwise treat it as a list of permitted host:port */
1906: for (i = 0; i < num_opens; i++) {
1907: oarg = arg = xstrdup(opens[i]);
1.573 dtucker 1908: addr = hpdelim(&arg);
1909: if (addr == NULL)
1.551 markus 1910: fatal_f("missing host in %s", what);
1911: addr = cleanhostname(addr);
1912: if (arg == NULL || ((port = permitopen_port(arg)) < 0))
1913: fatal_f("bad port number in %s", what);
1914: /* Send it to channels layer */
1915: channel_add_permission(ssh, FORWARD_ADM,
1916: where, addr, port);
1917: free(oarg);
1918: }
1919: }
1920:
1921: static void
1.466 djm 1922: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1923: {
1.86 markus 1924: int success = 0;
1.70 markus 1925: int i;
1.551 markus 1926:
1927: ssh_init_forward_permissions(ssh, "permitremoteopen",
1928: options.permitted_remote_opens,
1929: options.num_permitted_remote_opens);
1.331 dtucker 1930:
1.524 djm 1931: if (options.exit_on_forward_failure)
1932: forward_confirms_pending = 0; /* track pending requests */
1.70 markus 1933: /* Initiate local TCP/IP port forwardings. */
1934: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1935: debug("Local connections to %.200s:%d forwarded to remote "
1936: "address %.200s:%d",
1.406 millert 1937: (options.local_forwards[i].listen_path != NULL) ?
1938: options.local_forwards[i].listen_path :
1.234 deraadt 1939: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1940: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1941: options.local_forwards[i].listen_host,
1942: options.local_forwards[i].listen_port,
1.406 millert 1943: (options.local_forwards[i].connect_path != NULL) ?
1944: options.local_forwards[i].connect_path :
1.232 djm 1945: options.local_forwards[i].connect_host,
1946: options.local_forwards[i].connect_port);
1.463 djm 1947: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1948: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1949: }
1.283 markus 1950: if (i > 0 && success != i && options.exit_on_forward_failure)
1951: fatal("Could not request local forwarding.");
1.86 markus 1952: if (i > 0 && success == 0)
1953: error("Could not request local forwarding.");
1.70 markus 1954:
1955: /* Initiate remote TCP/IP port forwardings. */
1956: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1957: debug("Remote connections from %.200s:%d forwarded to "
1958: "local address %.200s:%d",
1.406 millert 1959: (options.remote_forwards[i].listen_path != NULL) ?
1960: options.remote_forwards[i].listen_path :
1.248 djm 1961: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1962: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1963: options.remote_forwards[i].listen_port,
1.406 millert 1964: (options.remote_forwards[i].connect_path != NULL) ?
1965: options.remote_forwards[i].connect_path :
1.232 djm 1966: options.remote_forwards[i].connect_host,
1967: options.remote_forwards[i].connect_port);
1.523 djm 1968: if ((options.remote_forwards[i].handle =
1.463 djm 1969: channel_request_remote_forwarding(ssh,
1.523 djm 1970: &options.remote_forwards[i])) >= 0) {
1.463 djm 1971: client_register_global_confirm(
1972: ssh_confirm_remote_forward,
1.366 markus 1973: &options.remote_forwards[i]);
1.523 djm 1974: forward_confirms_pending++;
1975: } else if (options.exit_on_forward_failure)
1976: fatal("Could not request remote forwarding.");
1977: else
1978: logit("Warning: Could not request remote forwarding.");
1.70 markus 1979: }
1.301 djm 1980:
1981: /* Initiate tunnel forwarding. */
1982: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1983: if ((*ifname = client_request_tun_fwd(ssh,
1984: options.tun_open, options.tun_local,
1.523 djm 1985: options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
1986: forward_confirms_pending++;
1987: else if (options.exit_on_forward_failure)
1988: fatal("Could not request tunnel forwarding.");
1989: else
1990: error("Could not request tunnel forwarding.");
1.524 djm 1991: }
1992: if (forward_confirms_pending > 0) {
1.540 djm 1993: debug_f("expecting replies for %d forwards",
1.524 djm 1994: forward_confirms_pending);
1.468 djm 1995: }
1.70 markus 1996: }
1997:
1.126 itojun 1998: static void
1.70 markus 1999: check_agent_present(void)
2000: {
1.412 djm 2001: int r;
2002:
1.70 markus 2003: if (options.forward_agent) {
1.254 djm 2004: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 2005: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 2006: options.forward_agent = 0;
1.412 djm 2007: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.540 djm 2008: debug_r(r, "ssh_get_authentication_socket");
1.412 djm 2009: }
1.70 markus 2010: }
2011: }
2012:
1.214 djm 2013: static void
1.463 djm 2014: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 2015: {
1.215 djm 2016: extern char **environ;
1.558 djm 2017: const char *display, *term;
1.499 djm 2018: int r, interactive = tty_flag;
1.433 djm 2019: char *proto = NULL, *data = NULL;
1.337 djm 2020:
2021: if (!success)
1.580 djm 2022: return; /* No need for error message, channels code sends one */
1.215 djm 2023:
1.248 djm 2024: display = getenv("DISPLAY");
1.417 djm 2025: if (display == NULL && options.forward_x11)
2026: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 2027: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 2028: options.xauth_location, options.forward_x11_trusted,
2029: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 2030: /* Request forwarding with authentication spoofing. */
1.316 djm 2031: debug("Requesting X11 forwarding with authentication "
2032: "spoofing.");
1.463 djm 2033: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 2034: data, 1);
1.463 djm 2035: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 2036: /* XXX exit_on_forward_failure */
1.80 markus 2037: interactive = 1;
1.50 markus 2038: }
2039:
1.70 markus 2040: check_agent_present();
2041: if (options.forward_agent) {
2042: debug("Requesting authentication agent forwarding.");
1.463 djm 2043: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 2044: if ((r = sshpkt_send(ssh)) != 0)
1.540 djm 2045: fatal_fr(r, "send packet");
1.212 djm 2046: }
1.369 dtucker 2047:
2048: /* Tell the packet module whether this is an interactive session. */
1.499 djm 2049: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 2050: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 2051:
1.558 djm 2052: if ((term = lookup_env_in_list("TERM", options.setenv,
2053: options.num_setenv)) == NULL || *term == '\0')
2054: term = getenv("TERM");
1.562 djm 2055: client_session2_setup(ssh, id, tty_flag,
2056: options.session_type == SESSION_TYPE_SUBSYSTEM, term,
1.482 markus 2057: NULL, fileno(stdin), command, environ);
1.45 markus 2058: }
2059:
1.143 markus 2060: /* open new channel for a session */
1.126 itojun 2061: static int
1.463 djm 2062: ssh_session2_open(struct ssh *ssh)
1.45 markus 2063: {
1.118 markus 2064: Channel *c;
2065: int window, packetmax, in, out, err;
1.60 markus 2066:
1.563 djm 2067: if (options.stdin_null) {
1.93 itojun 2068: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 2069: } else {
2070: in = dup(STDIN_FILENO);
2071: }
1.60 markus 2072: out = dup(STDOUT_FILENO);
2073: err = dup(STDERR_FILENO);
1.45 markus 2074:
1.505 deraadt 2075: if (in == -1 || out == -1 || err == -1)
1.62 markus 2076: fatal("dup() in/out/err failed");
1.45 markus 2077:
1.65 markus 2078: window = CHAN_SES_WINDOW_DEFAULT;
2079: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 2080: if (tty_flag) {
2081: window >>= 1;
2082: packetmax >>= 1;
1.45 markus 2083: }
1.463 djm 2084: c = channel_new(ssh,
1.45 markus 2085: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 2086: window, packetmax, CHAN_EXTENDED_WRITE,
1.557 djm 2087: "client-session", CHANNEL_NONBLOCK_STDIO);
1.45 markus 2088:
1.540 djm 2089: debug3_f("channel_new: %d", c->self);
1.106 markus 2090:
1.463 djm 2091: channel_send_open(ssh, c->self);
1.560 djm 2092: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2093: channel_register_open_confirm(ssh, c->self,
1.310 djm 2094: ssh_session2_setup, NULL);
1.106 markus 2095:
1.118 markus 2096: return c->self;
1.106 markus 2097: }
2098:
1.126 itojun 2099: static int
1.544 djm 2100: ssh_session2(struct ssh *ssh, const struct ssh_conn_info *cinfo)
1.106 markus 2101: {
1.537 djm 2102: int r, id = -1;
1.466 djm 2103: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 2104:
2105: /* XXX should be pre-session */
1.368 djm 2106: if (!options.control_persist)
1.463 djm 2107: ssh_init_stdio_forwarding(ssh);
1.466 djm 2108:
2109: ssh_init_forwarding(ssh, &tun_fwd_ifname);
2110:
2111: if (options.local_command != NULL) {
2112: debug3("expanding LocalCommand: %s", options.local_command);
2113: cp = options.local_command;
2114: options.local_command = percent_expand(cp,
1.546 djm 2115: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.466 djm 2116: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2117: (char *)NULL);
2118: debug3("expanded LocalCommand: %s", options.local_command);
2119: free(cp);
2120: }
1.106 markus 2121:
1.344 djm 2122: /* Start listening for multiplex clients */
1.499 djm 2123: if (!ssh_packet_get_mux(ssh))
1.463 djm 2124: muxserver_listen(ssh);
1.344 djm 2125:
1.473 djm 2126: /*
1.368 djm 2127: * If we are in control persist mode and have a working mux listen
2128: * socket, then prepare to background ourselves and have a foreground
1.531 djm 2129: * client attach as a control client.
1.368 djm 2130: * NB. we must save copies of the flags that we override for
1.531 djm 2131: * the backgrounding, since we defer attachment of the client until
1.344 djm 2132: * after the connection is fully established (in particular,
2133: * async rfwd replies have been received for ExitOnForwardFailure).
2134: */
1.473 djm 2135: if (options.control_persist && muxserver_sock != -1) {
1.563 djm 2136: ostdin_null_flag = options.stdin_null;
1.560 djm 2137: osession_type = options.session_type;
1.359 djm 2138: orequest_tty = options.request_tty;
1.344 djm 2139: otty_flag = tty_flag;
1.563 djm 2140: options.stdin_null = 1;
1.560 djm 2141: options.session_type = SESSION_TYPE_NONE;
1.473 djm 2142: tty_flag = 0;
1.564 djm 2143: if (!options.fork_after_authentication &&
1.562 djm 2144: (osession_type != SESSION_TYPE_NONE ||
2145: options.stdio_forward_host != NULL))
1.344 djm 2146: need_controlpersist_detach = 1;
1.564 djm 2147: options.fork_after_authentication = 1;
1.473 djm 2148: }
1.368 djm 2149: /*
2150: * ControlPersist mux listen socket setup failed, attempt the
2151: * stdio forward setup that we skipped earlier.
2152: */
2153: if (options.control_persist && muxserver_sock == -1)
1.463 djm 2154: ssh_init_stdio_forwarding(ssh);
1.344 djm 2155:
1.560 djm 2156: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2157: id = ssh_session2_open(ssh);
1.379 djm 2158: else {
1.499 djm 2159: ssh_packet_set_interactive(ssh,
1.379 djm 2160: options.control_master == SSHCTL_MASTER_NO,
2161: options.ip_qos_interactive, options.ip_qos_bulk);
2162: }
1.314 djm 2163:
2164: /* If we don't expect to open a new session, then disallow it */
1.319 markus 2165: if (options.control_master == SSHCTL_MASTER_NO &&
1.549 djm 2166: (ssh->compat & SSH_NEW_OPENSSH)) {
1.314 djm 2167: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 2168: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2169: (r = sshpkt_put_cstring(ssh,
2170: "no-more-sessions@openssh.com")) != 0 ||
2171: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2172: (r = sshpkt_send(ssh)) != 0)
1.540 djm 2173: fatal_fr(r, "send packet");
1.314 djm 2174: }
1.255 reyk 2175:
2176: /* Execute a local command */
2177: if (options.local_command != NULL &&
2178: options.permit_local_command)
2179: ssh_local_cmd(options.local_command);
1.467 djm 2180:
2181: /*
2182: * stdout is now owned by the session channel; clobber it here
2183: * so future channel closes are propagated to the local fd.
2184: * NB. this can only happen after LocalCommand has completed,
2185: * as it may want to write to stdout.
2186: */
1.537 djm 2187: if (!need_controlpersist_detach && stdfd_devnull(0, 1, 0) == -1)
1.540 djm 2188: error_f("stdfd_devnull failed");
1.301 djm 2189:
1.342 djm 2190: /*
2191: * If requested and we are not interested in replies to remote
2192: * forwarding requests, then let ssh continue in the background.
2193: */
1.564 djm 2194: if (options.fork_after_authentication) {
1.344 djm 2195: if (options.exit_on_forward_failure &&
2196: options.num_remote_forwards > 0) {
2197: debug("deferring postauth fork until remote forward "
2198: "confirmation received");
2199: } else
2200: fork_postauth();
1.318 djm 2201: }
1.31 markus 2202:
1.463 djm 2203: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2204: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2205: }
2206:
1.426 djm 2207: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2208: static void
1.544 djm 2209: load_public_identity_files(const struct ssh_conn_info *cinfo)
1.104 markus 2210: {
1.466 djm 2211: char *filename, *cp;
1.460 markus 2212: struct sshkey *public;
1.426 djm 2213: int i;
2214: u_int n_ids, n_certs;
1.335 djm 2215: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2216: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2217: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2218: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2219: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2220: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2221: #ifdef ENABLE_PKCS11
1.514 djm 2222: struct sshkey **keys = NULL;
2223: char **comments = NULL;
1.333 markus 2224: int nkeys;
1.335 djm 2225: #endif /* PKCS11 */
1.104 markus 2226:
1.426 djm 2227: n_ids = n_certs = 0;
1.398 tedu 2228: memset(identity_files, 0, sizeof(identity_files));
2229: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2230: memset(identity_file_userprovided, 0,
2231: sizeof(identity_file_userprovided));
1.426 djm 2232: memset(certificate_files, 0, sizeof(certificate_files));
2233: memset(certificates, 0, sizeof(certificates));
1.484 djm 2234: memset(certificate_file_userprovided, 0,
2235: sizeof(certificate_file_userprovided));
1.335 djm 2236:
2237: #ifdef ENABLE_PKCS11
1.333 markus 2238: if (options.pkcs11_provider != NULL &&
1.167 markus 2239: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2240: (pkcs11_init(!options.batch_mode) == 0) &&
2241: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1.514 djm 2242: &keys, &comments)) > 0) {
1.333 markus 2243: for (i = 0; i < nkeys; i++) {
1.335 djm 2244: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2245: sshkey_free(keys[i]);
1.514 djm 2246: free(comments[i]);
1.335 djm 2247: continue;
2248: }
2249: identity_keys[n_ids] = keys[i];
1.514 djm 2250: identity_files[n_ids] = comments[i]; /* transferred */
1.335 djm 2251: n_ids++;
1.167 markus 2252: }
1.378 djm 2253: free(keys);
1.514 djm 2254: free(comments);
1.127 markus 2255: }
1.333 markus 2256: #endif /* ENABLE_PKCS11 */
1.335 djm 2257: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2258: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2259: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2260: free(options.identity_files[i]);
1.426 djm 2261: options.identity_files[i] = NULL;
1.335 djm 2262: continue;
2263: }
1.490 dtucker 2264: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.544 djm 2265: filename = default_client_percent_dollar_expand(cp, cinfo);
1.378 djm 2266: free(cp);
1.483 markus 2267: check_load(sshkey_load_public(filename, &public, NULL),
1.576 djm 2268: &public, filename, "pubkey");
1.131 millert 2269: debug("identity file %s type %d", filename,
2270: public ? public->type : -1);
1.378 djm 2271: free(options.identity_files[i]);
1.335 djm 2272: identity_files[n_ids] = filename;
2273: identity_keys[n_ids] = public;
1.484 djm 2274: identity_file_userprovided[n_ids] =
2275: options.identity_file_userprovided[i];
1.335 djm 2276: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2277: continue;
2278:
1.426 djm 2279: /*
2280: * If no certificates have been explicitly listed then try
2281: * to add the default certificate variant too.
2282: */
2283: if (options.num_certificate_files != 0)
2284: continue;
1.335 djm 2285: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2286: check_load(sshkey_load_public(cp, &public, NULL),
1.576 djm 2287: &public, filename, "pubkey");
1.335 djm 2288: debug("identity file %s type %d", cp,
2289: public ? public->type : -1);
2290: if (public == NULL) {
1.378 djm 2291: free(cp);
1.335 djm 2292: continue;
2293: }
1.483 markus 2294: if (!sshkey_is_cert(public)) {
1.540 djm 2295: debug_f("key %s type %s is not a certificate",
2296: cp, sshkey_type(public));
1.483 markus 2297: sshkey_free(public);
1.378 djm 2298: free(cp);
1.335 djm 2299: continue;
2300: }
1.448 djm 2301: /* NB. leave filename pointing to private key */
2302: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2303: identity_keys[n_ids] = public;
1.484 djm 2304: identity_file_userprovided[n_ids] =
2305: options.identity_file_userprovided[i];
1.335 djm 2306: n_ids++;
2307: }
1.426 djm 2308:
2309: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
1.540 djm 2310: fatal_f("too many certificates");
1.426 djm 2311: for (i = 0; i < options.num_certificate_files; i++) {
2312: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2313: getuid());
1.544 djm 2314: filename = default_client_percent_dollar_expand(cp, cinfo);
1.426 djm 2315: free(cp);
2316:
1.483 markus 2317: check_load(sshkey_load_public(filename, &public, NULL),
1.576 djm 2318: &public, filename, "certificate");
1.426 djm 2319: debug("certificate file %s type %d", filename,
2320: public ? public->type : -1);
2321: free(options.certificate_files[i]);
2322: options.certificate_files[i] = NULL;
2323: if (public == NULL) {
2324: free(filename);
2325: continue;
2326: }
1.483 markus 2327: if (!sshkey_is_cert(public)) {
1.540 djm 2328: debug_f("key %s type %s is not a certificate",
2329: filename, sshkey_type(public));
1.483 markus 2330: sshkey_free(public);
1.426 djm 2331: free(filename);
2332: continue;
2333: }
2334: certificate_files[n_certs] = filename;
2335: certificates[n_certs] = public;
1.484 djm 2336: certificate_file_userprovided[n_certs] =
2337: options.certificate_file_userprovided[i];
1.426 djm 2338: ++n_certs;
2339: }
2340:
1.335 djm 2341: options.num_identity_files = n_ids;
2342: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2343: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2344: memcpy(options.identity_file_userprovided,
2345: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2346:
2347: options.num_certificate_files = n_certs;
2348: memcpy(options.certificate_files,
2349: certificate_files, sizeof(certificate_files));
2350: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2351: memcpy(options.certificate_file_userprovided,
2352: certificate_file_userprovided,
2353: sizeof(certificate_file_userprovided));
1.214 djm 2354: }
1.352 djm 2355:
2356: static void
2357: main_sigchld_handler(int sig)
2358: {
2359: int save_errno = errno;
2360: pid_t pid;
2361: int status;
2362:
2363: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2364: (pid == -1 && errno == EINTR))
1.352 djm 2365: ;
2366: errno = save_errno;
2367: }