Annotation of src/usr.bin/ssh/ssh.c, Revision 1.590
1.590 ! dlg 1: /* $OpenBSD: ssh.c,v 1.589 2023/06/21 05:08:32 djm Exp $ */
1.1 deraadt 2: /*
1.32 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * Ssh client program. This program can be used to log into a remote machine.
7: * The software supports strong authentication, encryption, and forwarding
8: * of X11, TCP/IP, and authentication connections.
9: *
1.64 deraadt 10: * As far as I am concerned, the code I have written for this software
11: * can be used freely for any purpose. Any derived versions of this
12: * software must be clearly marked as such, and if the derived work is
13: * incompatible with the protocol description in the RFC file, it must be
14: * called by a name other than "ssh" or "Secure Shell".
15: *
16: * Copyright (c) 1999 Niels Provos. All rights reserved.
1.202 markus 17: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 18: *
1.529 dtucker 19: * Modified to work with SSLeay by Niels Provos <provos@citi.umich.edu>
1.64 deraadt 20: * in Canada (German citizen).
21: *
22: * Redistribution and use in source and binary forms, with or without
23: * modification, are permitted provided that the following conditions
24: * are met:
25: * 1. Redistributions of source code must retain the above copyright
26: * notice, this list of conditions and the following disclaimer.
27: * 2. Redistributions in binary form must reproduce the above copyright
28: * notice, this list of conditions and the following disclaimer in the
29: * documentation and/or other materials provided with the distribution.
30: *
31: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 41: */
1.1 deraadt 42:
1.293 deraadt 43: #include <sys/types.h>
1.312 djm 44: #include <sys/ioctl.h>
45: #include <sys/queue.h>
1.259 stevesk 46: #include <sys/resource.h>
1.280 stevesk 47: #include <sys/socket.h>
1.264 stevesk 48: #include <sys/stat.h>
1.312 djm 49: #include <sys/time.h>
1.352 djm 50: #include <sys/wait.h>
1.258 stevesk 51:
1.265 stevesk 52: #include <ctype.h>
1.285 stevesk 53: #include <errno.h>
1.281 stevesk 54: #include <fcntl.h>
1.286 stevesk 55: #include <netdb.h>
1.258 stevesk 56: #include <paths.h>
1.279 stevesk 57: #include <pwd.h>
1.263 stevesk 58: #include <signal.h>
1.287 stevesk 59: #include <stddef.h>
1.291 stevesk 60: #include <stdio.h>
1.290 stevesk 61: #include <stdlib.h>
1.289 stevesk 62: #include <string.h>
1.509 naddy 63: #include <stdarg.h>
1.288 stevesk 64: #include <unistd.h>
1.414 deraadt 65: #include <limits.h>
1.445 djm 66: #include <locale.h>
1.49 markus 67:
1.402 markus 68: #ifdef WITH_OPENSSL
1.49 markus 69: #include <openssl/evp.h>
1.72 markus 70: #include <openssl/err.h>
1.402 markus 71: #endif
1.1 deraadt 72:
1.293 deraadt 73: #include "xmalloc.h"
1.84 markus 74: #include "ssh.h"
75: #include "ssh2.h"
1.341 djm 76: #include "canohost.h"
1.84 markus 77: #include "compat.h"
78: #include "cipher.h"
1.1 deraadt 79: #include "packet.h"
1.482 markus 80: #include "sshbuf.h"
1.123 markus 81: #include "channels.h"
1.483 markus 82: #include "sshkey.h"
1.58 markus 83: #include "authfd.h"
1.49 markus 84: #include "authfile.h"
1.83 markus 85: #include "pathnames.h"
1.214 djm 86: #include "dispatch.h"
1.81 markus 87: #include "clientloop.h"
1.84 markus 88: #include "log.h"
1.406 millert 89: #include "misc.h"
1.84 markus 90: #include "readconf.h"
91: #include "sshconnect.h"
1.95 markus 92: #include "kex.h"
93: #include "mac.h"
1.213 deraadt 94: #include "sshpty.h"
1.212 djm 95: #include "match.h"
1.214 djm 96: #include "msg.h"
1.278 stevesk 97: #include "version.h"
1.412 djm 98: #include "ssherr.h"
1.420 djm 99: #include "myproposal.h"
1.49 markus 100:
1.333 markus 101: #ifdef ENABLE_PKCS11
102: #include "ssh-pkcs11.h"
1.137 jakob 103: #endif
1.498 djm 104:
1.49 markus 105: extern char *__progname;
1.1 deraadt 106:
1.316 djm 107: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 108: int debug_flag = 0;
109:
1.359 djm 110: /* Flag indicating whether a tty should be requested */
1.1 deraadt 111: int tty_flag = 0;
112:
1.33 markus 113: /*
1.344 djm 114: * Flag indicating that the current process should be backgrounded and
1.531 djm 115: * a new mux-client launched in the foreground for ControlPersist.
1.344 djm 116: */
117: int need_controlpersist_detach = 0;
118:
1.531 djm 119: /* Copies of flags for ControlPersist foreground mux-client */
1.560 djm 120: int ostdin_null_flag, osession_type, otty_flag, orequest_tty;
1.344 djm 121:
122: /*
1.33 markus 123: * General data structure for command line options and options configurable
124: * in configuration files. See readconf.h.
125: */
1.1 deraadt 126: Options options;
127:
1.139 markus 128: /* optional user configfile */
129: char *config = NULL;
130:
1.33 markus 131: /*
132: * Name of the host we are connecting to. This is the name given on the
1.503 jmc 133: * command line, or the Hostname specified for the user-supplied name in a
1.33 markus 134: * configuration file.
135: */
1.1 deraadt 136: char *host;
137:
1.510 djm 138: /*
139: * A config can specify a path to forward, overriding SSH_AUTH_SOCK. If this is
140: * not NULL, forward the socket at this path instead.
141: */
142: char *forward_agent_sock_path = NULL;
143:
1.22 provos 144: /* socket address the host resolves to */
1.37 markus 145: struct sockaddr_storage hostaddr;
1.1 deraadt 146:
1.112 markus 147: /* Private host keys. */
1.173 markus 148: Sensitive sensitive_data;
1.1 deraadt 149:
1.45 markus 150: /* command to be executed */
1.482 markus 151: struct sshbuf *command;
1.45 markus 152:
1.170 markus 153: /* # of replies received for global requests */
1.523 djm 154: static int forward_confirms_pending = -1;
1.170 markus 155:
1.313 djm 156: /* mux.c */
157: extern int muxserver_sock;
158: extern u_int muxclient_command;
159:
1.1 deraadt 160: /* Prints a help message to the user. This function never returns. */
161:
1.126 itojun 162: static void
1.93 itojun 163: usage(void)
1.1 deraadt 164: {
1.208 markus 165: fprintf(stderr,
1.474 djm 166: "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n"
167: " [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n"
168: " [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n"
169: " [-i identity_file] [-J [user@]host[:port]] [-L address]\n"
170: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
171: " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
1.567 dtucker 172: " [-w local_tun[:remote_tun]] destination [command [argument ...]]\n"
1.208 markus 173: );
1.257 dtucker 174: exit(255);
1.1 deraadt 175: }
176:
1.544 djm 177: static int ssh_session2(struct ssh *, const struct ssh_conn_info *);
178: static void load_public_identity_files(const struct ssh_conn_info *);
1.352 djm 179: static void main_sigchld_handler(int);
1.312 djm 180:
1.361 djm 181: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
182: static void
183: tilde_expand_paths(char **paths, u_int num_paths)
184: {
185: u_int i;
186: char *cp;
187:
188: for (i = 0; i < num_paths; i++) {
1.490 dtucker 189: cp = tilde_expand_filename(paths[i], getuid());
1.378 djm 190: free(paths[i]);
1.361 djm 191: paths[i] = cp;
192: }
193: }
194:
1.527 dtucker 195: /*
196: * Expands the set of percent_expand options used by the majority of keywords
197: * in the client that support percent expansion.
198: * Caller must free returned string.
199: */
200: static char *
1.544 djm 201: default_client_percent_expand(const char *str,
202: const struct ssh_conn_info *cinfo)
1.527 dtucker 203: {
204: return percent_expand(str,
1.546 djm 205: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.527 dtucker 206: (char *)NULL);
207: }
208:
1.400 djm 209: /*
1.528 dtucker 210: * Expands the set of percent_expand options used by the majority of keywords
211: * AND perform environment variable substitution.
212: * Caller must free returned string.
213: */
214: static char *
1.544 djm 215: default_client_percent_dollar_expand(const char *str,
216: const struct ssh_conn_info *cinfo)
1.528 dtucker 217: {
218: char *ret;
219:
220: ret = percent_dollar_expand(str,
1.546 djm 221: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.528 dtucker 222: (char *)NULL);
223: if (ret == NULL)
224: fatal("invalid environment variable expansion");
225: return ret;
226: }
227:
228: /*
1.400 djm 229: * Attempt to resolve a host name / port to a set of addresses and
230: * optionally return any CNAMEs encountered along the way.
231: * Returns NULL on failure.
232: * NB. this function must operate with a options having undefined members.
233: */
1.385 djm 234: static struct addrinfo *
1.400 djm 235: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 236: {
237: char strport[NI_MAXSERV];
1.579 djm 238: const char *errstr = NULL;
1.385 djm 239: struct addrinfo hints, *res;
1.501 dtucker 240: int gaierr;
241: LogLevel loglevel = SYSLOG_LEVEL_DEBUG1;
1.385 djm 242:
1.400 djm 243: if (port <= 0)
244: port = default_ssh_port();
1.521 markus 245: if (cname != NULL)
246: *cname = '\0';
1.568 djm 247: debug3_f("lookup %s:%d", name, port);
1.400 djm 248:
1.427 djm 249: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 250: memset(&hints, 0, sizeof(hints));
1.400 djm 251: hints.ai_family = options.address_family == -1 ?
252: AF_UNSPEC : options.address_family;
1.385 djm 253: hints.ai_socktype = SOCK_STREAM;
254: if (cname != NULL)
255: hints.ai_flags = AI_CANONNAME;
256: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
257: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
258: loglevel = SYSLOG_LEVEL_ERROR;
259: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
260: __progname, name, ssh_gai_strerror(gaierr));
261: return NULL;
262: }
263: if (cname != NULL && res->ai_canonname != NULL) {
1.579 djm 264: if (!valid_domain(res->ai_canonname, 0, &errstr)) {
265: error("ignoring bad CNAME \"%s\" for host \"%s\": %s",
266: res->ai_canonname, name, errstr);
267: } else if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
1.540 djm 268: error_f("host \"%s\" cname \"%s\" too long (max %lu)",
269: name, res->ai_canonname, (u_long)clen);
1.385 djm 270: if (clen > 0)
271: *cname = '\0';
272: }
273: }
274: return res;
275: }
276:
1.470 djm 277: /* Returns non-zero if name can only be an address and not a hostname */
278: static int
279: is_addr_fast(const char *name)
280: {
281: return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
282: strspn(name, "0123456789.") == strlen(name));
283: }
284:
285: /* Returns non-zero if name represents a valid, single address */
286: static int
287: is_addr(const char *name)
288: {
289: char strport[NI_MAXSERV];
290: struct addrinfo hints, *res;
291:
292: if (is_addr_fast(name))
293: return 1;
294:
295: snprintf(strport, sizeof strport, "%u", default_ssh_port());
296: memset(&hints, 0, sizeof(hints));
297: hints.ai_family = options.address_family == -1 ?
298: AF_UNSPEC : options.address_family;
299: hints.ai_socktype = SOCK_STREAM;
300: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
301: if (getaddrinfo(name, strport, &hints, &res) != 0)
302: return 0;
303: if (res == NULL || res->ai_next != NULL) {
304: freeaddrinfo(res);
305: return 0;
306: }
307: freeaddrinfo(res);
308: return 1;
309: }
310:
1.385 djm 311: /*
1.413 djm 312: * Attempt to resolve a numeric host address / port to a single address.
313: * Returns a canonical address string.
314: * Returns NULL on failure.
315: * NB. this function must operate with a options having undefined members.
316: */
317: static struct addrinfo *
318: resolve_addr(const char *name, int port, char *caddr, size_t clen)
319: {
320: char addr[NI_MAXHOST], strport[NI_MAXSERV];
321: struct addrinfo hints, *res;
322: int gaierr;
323:
324: if (port <= 0)
325: port = default_ssh_port();
326: snprintf(strport, sizeof strport, "%u", port);
327: memset(&hints, 0, sizeof(hints));
328: hints.ai_family = options.address_family == -1 ?
329: AF_UNSPEC : options.address_family;
330: hints.ai_socktype = SOCK_STREAM;
331: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
332: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
1.540 djm 333: debug2_f("could not resolve name %.100s as address: %s",
334: name, ssh_gai_strerror(gaierr));
1.413 djm 335: return NULL;
336: }
337: if (res == NULL) {
1.540 djm 338: debug_f("getaddrinfo %.100s returned no addresses", name);
1.413 djm 339: return NULL;
340: }
341: if (res->ai_next != NULL) {
1.540 djm 342: debug_f("getaddrinfo %.100s returned multiple addresses", name);
1.413 djm 343: goto fail;
344: }
345: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
346: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
1.540 djm 347: debug_f("Could not format address for name %.100s: %s",
348: name, ssh_gai_strerror(gaierr));
1.413 djm 349: goto fail;
350: }
351: if (strlcpy(caddr, addr, clen) >= clen) {
1.540 djm 352: error_f("host \"%s\" addr \"%s\" too long (max %lu)",
353: name, addr, (u_long)clen);
1.413 djm 354: if (clen > 0)
355: *caddr = '\0';
356: fail:
357: freeaddrinfo(res);
358: return NULL;
359: }
360: return res;
361: }
362:
363: /*
1.385 djm 364: * Check whether the cname is a permitted replacement for the hostname
365: * and perform the replacement if it is.
1.400 djm 366: * NB. this function must operate with a options having undefined members.
1.385 djm 367: */
368: static int
1.443 djm 369: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 370: {
371: int i;
372: struct allowed_cname *rule;
373:
1.568 djm 374: if (*cname == '\0' || !config_has_permitted_cnames(&options) ||
1.385 djm 375: strcmp(*namep, cname) == 0)
376: return 0;
1.386 djm 377: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 378: return 0;
379: /*
1.386 djm 380: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 381: * a proxy or jump host unless the user specifically requests so.
1.385 djm 382: */
1.443 djm 383: if (!direct &&
1.386 djm 384: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 385: return 0;
1.540 djm 386: debug3_f("check \"%s\" CNAME \"%s\"", *namep, cname);
1.385 djm 387: for (i = 0; i < options.num_permitted_cnames; i++) {
388: rule = options.permitted_cnames + i;
1.418 djm 389: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
390: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 391: continue;
1.386 djm 392: verbose("Canonicalized DNS aliased hostname "
1.385 djm 393: "\"%s\" => \"%s\"", *namep, cname);
394: free(*namep);
395: *namep = xstrdup(cname);
396: return 1;
397: }
398: return 0;
399: }
400:
401: /*
402: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 403: * canonicalization rules. Returns the address list for the host or NULL
404: * if no name was found after canonicalization.
1.400 djm 405: * NB. this function must operate with a options having undefined members.
1.385 djm 406: */
407: static struct addrinfo *
1.400 djm 408: resolve_canonicalize(char **hostp, int port)
1.385 djm 409: {
1.443 djm 410: int i, direct, ndots;
1.413 djm 411: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 412: struct addrinfo *addrs;
413:
414: /*
1.470 djm 415: * Attempt to canonicalise addresses, regardless of
416: * whether hostname canonicalisation was requested
1.385 djm 417: */
1.413 djm 418: if ((addrs = resolve_addr(*hostp, port,
419: newname, sizeof(newname))) != NULL) {
1.540 djm 420: debug2_f("hostname %.100s is address", *hostp);
1.413 djm 421: if (strcasecmp(*hostp, newname) != 0) {
1.540 djm 422: debug2_f("canonicalised address \"%s\" => \"%s\"",
423: *hostp, newname);
1.413 djm 424: free(*hostp);
425: *hostp = xstrdup(newname);
426: }
427: return addrs;
428: }
429:
1.470 djm 430: /*
431: * If this looks like an address but didn't parse as one, it might
432: * be an address with an invalid interface scope. Skip further
433: * attempts at canonicalisation.
434: */
435: if (is_addr_fast(*hostp)) {
1.540 djm 436: debug_f("hostname %.100s is an unrecognised address", *hostp);
1.470 djm 437: return NULL;
438: }
439:
440: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
441: return NULL;
442:
443: /*
444: * Don't attempt to canonicalize names that will be interpreted by
445: * a proxy unless the user specifically requests so.
446: */
447: direct = option_clear_or_none(options.proxy_command) &&
1.588 djm 448: option_clear_or_none(options.jump_host);
1.470 djm 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');
1.589 djm 770: else if (strcmp(optarg, "key-ca-sign") == 0 ||
771: strcasecmp(optarg, "CASignatureAlgorithms") == 0)
772: cp = sshkey_alg_list(0, 1, 1, '\n');
1.519 dtucker 773: else if (strcmp(optarg, "key-sig") == 0 ||
1.547 dtucker 774: strcasecmp(optarg, "PubkeyAcceptedKeyTypes") == 0 || /* deprecated name */
775: strcasecmp(optarg, "PubkeyAcceptedAlgorithms") == 0 ||
1.519 dtucker 776: strcasecmp(optarg, "HostKeyAlgorithms") == 0 ||
1.548 dtucker 777: strcasecmp(optarg, "HostbasedKeyTypes") == 0 || /* deprecated name */
778: strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 0 || /* deprecated name */
779: strcasecmp(optarg, "HostbasedAcceptedAlgorithms") == 0)
1.519 dtucker 780: cp = sshkey_alg_list(0, 0, 1, '\n');
1.491 djm 781: else if (strcmp(optarg, "sig") == 0)
1.492 djm 782: cp = sshkey_alg_list(0, 1, 1, '\n');
1.491 djm 783: else if (strcmp(optarg, "protocol-version") == 0)
1.416 djm 784: cp = xstrdup("2");
1.513 dtucker 785: else if (strcmp(optarg, "compression") == 0) {
786: cp = xstrdup(compression_alg_list(0));
787: len = strlen(cp);
788: for (n = 0; n < len; n++)
789: if (cp[n] == ',')
790: cp[n] = '\n';
791: } else if (strcmp(optarg, "help") == 0) {
1.491 djm 792: cp = xstrdup(
1.513 dtucker 793: "cipher\ncipher-auth\ncompression\nkex\n"
1.519 dtucker 794: "key\nkey-cert\nkey-plain\nkey-sig\nmac\n"
1.491 djm 795: "protocol-version\nsig");
1.416 djm 796: }
1.376 djm 797: if (cp == NULL)
798: fatal("Unsupported query \"%s\"", optarg);
799: printf("%s\n", cp);
800: free(cp);
801: exit(0);
1.31 markus 802: break;
803: case 'a':
804: options.forward_agent = 0;
1.53 markus 805: break;
806: case 'A':
807: options.forward_agent = 1;
1.31 markus 808: break;
809: case 'k':
1.204 dtucker 810: options.gss_deleg_creds = 0;
1.297 djm 811: break;
812: case 'K':
813: options.gss_authentication = 1;
814: options.gss_deleg_creds = 1;
1.31 markus 815: break;
816: case 'i':
1.490 dtucker 817: p = tilde_expand_filename(optarg, getuid());
1.505 deraadt 818: if (stat(p, &st) == -1)
1.128 fgsch 819: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 820: "not accessible: %s.\n", p,
1.231 otto 821: strerror(errno));
1.429 dtucker 822: else
823: add_identity_file(&options, NULL, p, 1);
824: free(p);
1.31 markus 825: break;
1.127 markus 826: case 'I':
1.333 markus 827: #ifdef ENABLE_PKCS11
1.422 dtucker 828: free(options.pkcs11_provider);
1.333 markus 829: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 830: #else
1.333 markus 831: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 832: #endif
1.127 markus 833: break;
1.443 djm 834: case 'J':
1.504 djm 835: if (options.jump_host != NULL) {
836: fatal("Only a single -J option is permitted "
837: "(use commas to separate multiple "
838: "jump hops)");
839: }
1.443 djm 840: if (options.proxy_command != NULL)
841: fatal("Cannot specify -J with ProxyCommand");
842: if (parse_jump(optarg, &options, 1) == -1)
843: fatal("Invalid -J argument");
844: options.proxy_command = xstrdup("none");
845: break;
1.31 markus 846: case 't':
1.359 djm 847: if (options.request_tty == REQUEST_TTY_YES)
848: options.request_tty = REQUEST_TTY_FORCE;
849: else
850: options.request_tty = REQUEST_TTY_YES;
1.31 markus 851: break;
852: case 'v':
1.197 markus 853: if (debug_flag == 0) {
1.66 markus 854: debug_flag = 1;
855: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 856: } else {
1.443 djm 857: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
858: debug_flag++;
1.197 markus 859: options.log_level++;
1.443 djm 860: }
1.197 markus 861: }
1.375 dtucker 862: break;
1.31 markus 863: case 'V':
1.209 markus 864: fprintf(stderr, "%s, %s\n",
1.541 dtucker 865: SSH_VERSION, SSH_OPENSSL_VERSION);
1.584 millert 866: exit(0);
1.31 markus 867: break;
1.255 reyk 868: case 'w':
1.256 reyk 869: if (options.tun_open == -1)
870: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 871: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 872: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 873: fprintf(stderr,
874: "Bad tun device '%s'\n", optarg);
1.257 dtucker 875: exit(255);
1.255 reyk 876: }
877: break;
1.331 dtucker 878: case 'W':
1.441 dtucker 879: if (options.stdio_forward_host != NULL)
1.332 djm 880: fatal("stdio forward already specified");
881: if (muxclient_command != 0)
882: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 883: if (parse_forward(&fwd, optarg, 1, 0)) {
1.590 ! dlg 884: options.stdio_forward_host =
! 885: fwd.listen_port == PORT_STREAMLOCAL ?
! 886: fwd.listen_path : fwd.listen_host;
1.441 dtucker 887: options.stdio_forward_port = fwd.listen_port;
1.378 djm 888: free(fwd.connect_host);
1.331 dtucker 889: } else {
890: fprintf(stderr,
891: "Bad stdio forwarding specification '%s'\n",
892: optarg);
893: exit(255);
894: }
1.359 djm 895: options.request_tty = REQUEST_TTY_NO;
1.560 djm 896: options.session_type = SESSION_TYPE_NONE;
1.331 dtucker 897: break;
1.31 markus 898: case 'q':
899: options.log_level = SYSLOG_LEVEL_QUIET;
900: break;
901: case 'e':
902: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 903: (u_char) optarg[1] >= 64 &&
904: (u_char) optarg[1] < 128)
1.78 markus 905: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 906: else if (strlen(optarg) == 1)
1.78 markus 907: options.escape_char = (u_char) optarg[0];
1.31 markus 908: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 909: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 910: else {
1.128 fgsch 911: fprintf(stderr, "Bad escape character '%s'.\n",
912: optarg);
1.257 dtucker 913: exit(255);
1.31 markus 914: }
915: break;
916: case 'c':
1.506 naddy 917: if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
1.420 djm 918: optarg + 1 : optarg)) {
919: fprintf(stderr, "Unknown cipher type '%s'\n",
920: optarg);
921: exit(255);
1.95 markus 922: }
1.456 djm 923: free(options.ciphers);
924: options.ciphers = xstrdup(optarg);
1.95 markus 925: break;
926: case 'm':
1.422 dtucker 927: if (mac_valid(optarg)) {
928: free(options.macs);
1.95 markus 929: options.macs = xstrdup(optarg);
1.422 dtucker 930: } else {
1.128 fgsch 931: fprintf(stderr, "Unknown mac type '%s'\n",
932: optarg);
1.257 dtucker 933: exit(255);
1.31 markus 934: }
935: break;
1.214 djm 936: case 'M':
1.242 djm 937: if (options.control_master == SSHCTL_MASTER_YES)
938: options.control_master = SSHCTL_MASTER_ASK;
939: else
940: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 941: break;
1.31 markus 942: case 'p':
1.465 millert 943: if (options.port == -1) {
944: options.port = a2port(optarg);
945: if (options.port <= 0) {
946: fprintf(stderr, "Bad port '%s'\n",
947: optarg);
948: exit(255);
949: }
1.109 markus 950: }
1.31 markus 951: break;
952: case 'l':
1.465 millert 953: if (options.user == NULL)
954: options.user = optarg;
1.31 markus 955: break;
1.141 stevesk 956:
957: case 'L':
1.324 djm 958: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 959: add_local_forward(&options, &fwd);
960: else {
1.128 fgsch 961: fprintf(stderr,
1.232 djm 962: "Bad local forwarding specification '%s'\n",
1.128 fgsch 963: optarg);
1.257 dtucker 964: exit(255);
1.31 markus 965: }
1.232 djm 966: break;
967:
968: case 'R':
1.464 markus 969: if (parse_forward(&fwd, optarg, 0, 1) ||
970: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 971: add_remote_forward(&options, &fwd);
972: } else {
1.128 fgsch 973: fprintf(stderr,
1.232 djm 974: "Bad remote forwarding specification "
975: "'%s'\n", optarg);
1.257 dtucker 976: exit(255);
1.31 markus 977: }
978: break;
1.108 markus 979:
980: case 'D':
1.324 djm 981: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 982: add_local_forward(&options, &fwd);
1.232 djm 983: } else {
1.322 stevesk 984: fprintf(stderr,
985: "Bad dynamic forwarding specification "
986: "'%s'\n", optarg);
1.257 dtucker 987: exit(255);
1.109 markus 988: }
1.108 markus 989: break;
990:
1.31 markus 991: case 'C':
1.513 dtucker 992: #ifdef WITH_ZLIB
1.31 markus 993: options.compression = 1;
1.513 dtucker 994: #else
995: error("Compression not supported, disabling.");
996: #endif
1.31 markus 997: break;
1.45 markus 998: case 'N':
1.560 djm 999: if (options.session_type != -1 &&
1000: options.session_type != SESSION_TYPE_NONE)
1001: fatal("Cannot specify -N with -s/SessionType");
1002: options.session_type = SESSION_TYPE_NONE;
1.359 djm 1003: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1004: break;
1005: case 'T':
1.359 djm 1006: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1007: break;
1.31 markus 1008: case 'o':
1.205 markus 1009: line = xstrdup(optarg);
1.408 djm 1010: if (process_config_line(&options, pw,
1011: host ? host : "", host ? host : "", line,
1012: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 1013: exit(255);
1.378 djm 1014: free(line);
1.31 markus 1015: break;
1.85 djm 1016: case 's':
1.560 djm 1017: if (options.session_type != -1 &&
1018: options.session_type != SESSION_TYPE_SUBSYSTEM)
1019: fatal("Cannot specify -s with -N/SessionType");
1020: options.session_type = SESSION_TYPE_SUBSYSTEM;
1.117 markus 1021: break;
1.214 djm 1022: case 'S':
1.431 mmcc 1023: free(options.control_path);
1.214 djm 1024: options.control_path = xstrdup(optarg);
1025: break;
1.117 markus 1026: case 'b':
1027: options.bind_address = optarg;
1.474 djm 1028: break;
1029: case 'B':
1030: options.bind_interface = optarg;
1.85 djm 1031: break;
1.139 markus 1032: case 'F':
1033: config = optarg;
1034: break;
1.31 markus 1035: default:
1036: usage();
1.1 deraadt 1037: }
1.31 markus 1038: }
1039:
1.462 djm 1040: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
1041: opt_terminated = 1;
1042:
1.128 fgsch 1043: ac -= optind;
1044: av += optind;
1045:
1.329 guenther 1046: if (ac > 0 && !host) {
1.465 millert 1047: int tport;
1048: char *tuser;
1049: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
1050: case -1:
1051: usage();
1052: break;
1053: case 0:
1054: if (options.user == NULL) {
1055: options.user = tuser;
1056: tuser = NULL;
1057: }
1058: free(tuser);
1059: if (options.port == -1 && tport != -1)
1060: options.port = tport;
1061: break;
1062: default:
1.128 fgsch 1063: p = xstrdup(*av);
1.188 markus 1064: cp = strrchr(p, '@');
1.465 millert 1065: if (cp != NULL) {
1066: if (cp == p)
1067: usage();
1068: if (options.user == NULL) {
1069: options.user = p;
1070: p = NULL;
1071: }
1072: *cp++ = '\0';
1073: host = xstrdup(cp);
1074: free(p);
1075: } else
1076: host = p;
1077: break;
1078: }
1.462 djm 1079: if (ac > 1 && !opt_terminated) {
1.189 millert 1080: optind = optreset = 1;
1.128 fgsch 1081: goto again;
1082: }
1.189 millert 1083: ac--, av++;
1.128 fgsch 1084: }
1085:
1.31 markus 1086: /* Check that we got a host name. */
1087: if (!host)
1088: usage();
1089:
1.583 dtucker 1090: options.host_arg = xstrdup(host);
1.385 djm 1091:
1.402 markus 1092: #ifdef WITH_OPENSSL
1.350 djm 1093: OpenSSL_add_all_algorithms();
1.72 markus 1094: ERR_load_crypto_strings();
1.402 markus 1095: #endif
1.31 markus 1096:
1097: /* Initialize the command to execute on remote host. */
1.482 markus 1098: if ((command = sshbuf_new()) == NULL)
1099: fatal("sshbuf_new failed");
1.1 deraadt 1100:
1.33 markus 1101: /*
1102: * Save the command to execute on the remote host in a buffer. There
1103: * is no limit on the length of the command, except by the maximum
1104: * packet size. Also sets the tty flag if there is no command.
1105: */
1.128 fgsch 1106: if (!ac) {
1.31 markus 1107: /* No command specified - execute shell on a tty. */
1.560 djm 1108: if (options.session_type == SESSION_TYPE_SUBSYSTEM) {
1.128 fgsch 1109: fprintf(stderr,
1110: "You must specify a subsystem to invoke.\n");
1.85 djm 1111: usage();
1112: }
1.31 markus 1113: } else {
1.128 fgsch 1114: /* A command has been specified. Store it into the buffer. */
1115: for (i = 0; i < ac; i++) {
1.482 markus 1116: if ((r = sshbuf_putf(command, "%s%s",
1117: i ? " " : "", av[i])) != 0)
1.540 djm 1118: fatal_fr(r, "buffer error");
1.31 markus 1119: }
1120: }
1121:
1.575 djm 1122: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1123:
1.101 markus 1124: /*
1125: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1126: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1127: */
1.375 dtucker 1128: if (use_syslog && logfile != NULL)
1129: fatal("Can't specify both -y and -E");
1.422 dtucker 1130: if (logfile != NULL)
1.375 dtucker 1131: log_redirect_stderr_to(logfile);
1.325 markus 1132: log_init(argv0,
1.468 djm 1133: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1134: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1135: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1136: SYSLOG_FACILITY_USER : options.log_facility,
1137: !use_syslog);
1.375 dtucker 1138:
1139: if (debug_flag)
1.541 dtucker 1140: logit("%s, %s", SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 1141:
1.400 djm 1142: /* Parse the configuration files */
1.583 dtucker 1143: process_config_files(options.host_arg, pw, 0, &want_final_pass);
1.496 djm 1144: if (want_final_pass)
1145: debug("configuration requests final Match pass");
1.400 djm 1146:
1147: /* Hostname canonicalisation needs a few options filled. */
1148: fill_default_options_for_canonicalization(&options);
1149:
1150: /* If the user has replaced the hostname then take it into use now */
1151: if (options.hostname != NULL) {
1152: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1153: cp = percent_expand(options.hostname,
1154: "h", host, (char *)NULL);
1155: free(host);
1156: host = cp;
1.408 djm 1157: free(options.hostname);
1158: options.hostname = xstrdup(host);
1.400 djm 1159: }
1160:
1.470 djm 1161: /* Don't lowercase addresses, they will be explicitly canonicalised */
1162: if ((was_addr = is_addr(host)) == 0)
1163: lowercase(host);
1164:
1165: /*
1166: * Try to canonicalize if requested by configuration or the
1167: * hostname is an address.
1168: */
1169: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1170: addrs = resolve_canonicalize(&host, options.port);
1171:
1.139 markus 1172: /*
1.401 djm 1173: * If CanonicalizePermittedCNAMEs have been specified but
1174: * other canonicalization did not happen (by not being requested
1175: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1176: * as a result of CNAME following.
1.401 djm 1177: *
1178: * Try to resolve the bare hostname name using the system resolver's
1179: * usual search rules and then apply the CNAME follow rules.
1180: *
1181: * Skip the lookup if a ProxyCommand is being used unless the user
1182: * has specifically requested canonicalisation for this case via
1183: * CanonicalizeHostname=always
1.139 markus 1184: */
1.443 djm 1185: direct = option_clear_or_none(options.proxy_command) &&
1.588 djm 1186: option_clear_or_none(options.jump_host);
1.568 djm 1187: if (addrs == NULL && config_has_permitted_cnames(&options) && (direct ||
1.443 djm 1188: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1189: if ((addrs = resolve_host(host, options.port,
1.493 djm 1190: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1191: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1192: if (direct)
1.403 djm 1193: cleanup_exit(255); /* logged in resolve_host */
1194: } else
1.443 djm 1195: check_follow_cname(direct, &host, cname);
1.400 djm 1196: }
1.139 markus 1197:
1.400 djm 1198: /*
1.408 djm 1199: * If canonicalisation is enabled then re-parse the configuration
1200: * files as new stanzas may match.
1.400 djm 1201: */
1.496 djm 1202: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1203: debug("hostname canonicalisation enabled, "
1204: "will re-parse configuration");
1205: want_final_pass = 1;
1206: }
1207:
1208: if (want_final_pass) {
1209: debug("re-parsing configuration");
1.408 djm 1210: free(options.hostname);
1211: options.hostname = xstrdup(host);
1.583 dtucker 1212: process_config_files(options.host_arg, pw, 1, NULL);
1.408 djm 1213: /*
1214: * Address resolution happens early with canonicalisation
1215: * enabled and the port number may have changed since, so
1216: * reset it in address list
1217: */
1218: if (addrs != NULL && options.port > 0)
1219: set_addrinfo_port(addrs, options.port);
1.139 markus 1220: }
1.31 markus 1221:
1222: /* Fill configuration defaults. */
1.543 djm 1223: if (fill_default_options(&options) != 0)
1224: cleanup_exit(255);
1.443 djm 1225:
1.534 dtucker 1226: if (options.user == NULL)
1227: options.user = xstrdup(pw->pw_name);
1228:
1.443 djm 1229: /*
1230: * If ProxyJump option specified, then construct a ProxyCommand now.
1231: */
1232: if (options.jump_host != NULL) {
1233: char port_s[8];
1.534 dtucker 1234: const char *jumpuser = options.jump_user, *sshbin = argv0;
1.520 dtucker 1235: int port = options.port, jumpport = options.jump_port;
1236:
1237: if (port <= 0)
1238: port = default_ssh_port();
1239: if (jumpport <= 0)
1240: jumpport = default_ssh_port();
1.534 dtucker 1241: if (jumpuser == NULL)
1242: jumpuser = options.user;
1243: if (strcmp(options.jump_host, host) == 0 && port == jumpport &&
1244: strcmp(options.user, jumpuser) == 0)
1.520 dtucker 1245: fatal("jumphost loop via %s", options.jump_host);
1.478 djm 1246:
1247: /*
1248: * Try to use SSH indicated by argv[0], but fall back to
1249: * "ssh" if it appears unavailable.
1250: */
1251: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1252: sshbin = "ssh";
1.443 djm 1253:
1254: /* Consistency check */
1255: if (options.proxy_command != NULL)
1256: fatal("inconsistent options: ProxyCommand+ProxyJump");
1257: /* Never use FD passing for ProxyJump */
1258: options.proxy_use_fdpass = 0;
1259: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1260: xasprintf(&options.proxy_command,
1.478 djm 1261: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1262: sshbin,
1.443 djm 1263: /* Optional "-l user" argument if jump_user set */
1264: options.jump_user == NULL ? "" : " -l ",
1265: options.jump_user == NULL ? "" : options.jump_user,
1266: /* Optional "-p port" argument if jump_port set */
1267: options.jump_port <= 0 ? "" : " -p ",
1268: options.jump_port <= 0 ? "" : port_s,
1269: /* Optional additional jump hosts ",..." */
1270: options.jump_extra == NULL ? "" : " -J ",
1271: options.jump_extra == NULL ? "" : options.jump_extra,
1.571 jsg 1272: /* Optional "-F" argument if -F specified */
1.443 djm 1273: config == NULL ? "" : " -F ",
1274: config == NULL ? "" : config,
1275: /* Optional "-v" arguments if -v set */
1276: debug_flag ? " -" : "",
1277: debug_flag, "vvv",
1278: /* Mandatory hostname */
1279: options.jump_host);
1280: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1281: options.proxy_command);
1282: }
1.31 markus 1283:
1.400 djm 1284: if (options.port == 0)
1285: options.port = default_ssh_port();
1.463 djm 1286: channel_set_af(ssh, options.address_family);
1.196 djm 1287:
1.383 djm 1288: /* Tidy and check options */
1289: if (options.host_key_alias != NULL)
1290: lowercase(options.host_key_alias);
1291: if (options.proxy_command != NULL &&
1292: strcmp(options.proxy_command, "-") == 0 &&
1293: options.proxy_use_fdpass)
1294: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.516 markus 1295: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1296: if (options.control_persist && options.control_path != NULL) {
1297: debug("UpdateHostKeys=ask is incompatible with "
1298: "ControlPersist; disabling");
1299: options.update_hostkeys = 0;
1300: } else if (sshbuf_len(command) != 0 ||
1301: options.remote_command != NULL ||
1302: options.request_tty == REQUEST_TTY_NO) {
1303: debug("UpdateHostKeys=ask is incompatible with "
1304: "remote command execution; disabling");
1.517 djm 1305: options.update_hostkeys = 0;
1306: } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1307: /* no point logging anything; user won't see it */
1.516 markus 1308: options.update_hostkeys = 0;
1309: }
1.415 djm 1310: }
1.430 djm 1311: if (options.connection_attempts <= 0)
1312: fatal("Invalid number of ConnectionAttempts");
1313:
1.482 markus 1314: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1315: fatal("Cannot execute command-line and remote command.");
1316:
1317: /* Cannot fork to background if no command. */
1.564 djm 1318: if (options.fork_after_authentication && sshbuf_len(command) == 0 &&
1.562 djm 1319: options.remote_command == NULL &&
1320: options.session_type != SESSION_TYPE_NONE)
1.461 bluhm 1321: fatal("Cannot fork into background without a command "
1322: "to execute.");
1323:
1.31 markus 1324: /* reinit */
1.452 dtucker 1325: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.559 djm 1326: for (j = 0; j < options.num_log_verbose; j++) {
1327: if (strcasecmp(options.log_verbose[j], "none") == 0)
1328: break;
1.539 djm 1329: log_verbose_add(options.log_verbose[j]);
1.559 djm 1330: }
1.370 djm 1331:
1332: if (options.request_tty == REQUEST_TTY_YES ||
1333: options.request_tty == REQUEST_TTY_FORCE)
1334: tty_flag = 1;
1335:
1336: /* Allocate a tty by default if no command specified. */
1.482 markus 1337: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1338: tty_flag = options.request_tty != REQUEST_TTY_NO;
1339:
1340: /* Force no tty */
1.447 markus 1341: if (options.request_tty == REQUEST_TTY_NO ||
1.570 djm 1342: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY) ||
1343: options.session_type == SESSION_TYPE_NONE)
1.370 djm 1344: tty_flag = 0;
1345: /* Do not allocate a tty if stdin is not a tty. */
1.563 djm 1346: if ((!isatty(fileno(stdin)) || options.stdin_null) &&
1.370 djm 1347: options.request_tty != REQUEST_TTY_FORCE) {
1348: if (tty_flag)
1349: logit("Pseudo-terminal will not be allocated because "
1350: "stdin is not a terminal.");
1351: tty_flag = 0;
1352: }
1.343 djm 1353:
1.466 djm 1354: /* Set up strings used to percent_expand() arguments */
1.544 djm 1355: cinfo = xcalloc(1, sizeof(*cinfo));
1.358 djm 1356: if (gethostname(thishost, sizeof(thishost)) == -1)
1357: fatal("gethostname: %s", strerror(errno));
1.544 djm 1358: cinfo->thishost = xstrdup(thishost);
1359: thishost[strcspn(thishost, ".")] = '\0';
1360: cinfo->shorthost = xstrdup(thishost);
1361: xasprintf(&cinfo->portstr, "%d", options.port);
1362: xasprintf(&cinfo->uidstr, "%llu",
1.479 djm 1363: (unsigned long long)pw->pw_uid);
1.544 djm 1364: cinfo->keyalias = xstrdup(options.host_key_alias ?
1.583 dtucker 1365: options.host_key_alias : options.host_arg);
1.544 djm 1366: cinfo->conn_hash_hex = ssh_connection_hash(cinfo->thishost, host,
1367: cinfo->portstr, options.user);
1.583 dtucker 1368: cinfo->host_arg = xstrdup(options.host_arg);
1.544 djm 1369: cinfo->remhost = xstrdup(host);
1370: cinfo->remuser = xstrdup(options.user);
1371: cinfo->homedir = xstrdup(pw->pw_dir);
1372: cinfo->locuser = xstrdup(pw->pw_name);
1.405 djm 1373:
1.466 djm 1374: /*
1375: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1376: * after port-forwarding is set up, so it may pick up any local
1377: * tunnel interface name allocated.
1378: */
1.461 bluhm 1379: if (options.remote_command != NULL) {
1380: debug3("expanding RemoteCommand: %s", options.remote_command);
1381: cp = options.remote_command;
1.527 dtucker 1382: options.remote_command = default_client_percent_expand(cp,
1.544 djm 1383: cinfo);
1.461 bluhm 1384: debug3("expanded RemoteCommand: %s", options.remote_command);
1385: free(cp);
1.482 markus 1386: if ((r = sshbuf_put(command, options.remote_command,
1387: strlen(options.remote_command))) != 0)
1.540 djm 1388: fatal_fr(r, "buffer error");
1.304 dtucker 1389: }
1.31 markus 1390:
1.214 djm 1391: if (options.control_path != NULL) {
1.490 dtucker 1392: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1393: free(options.control_path);
1.528 dtucker 1394: options.control_path = default_client_percent_dollar_expand(cp,
1.544 djm 1395: cinfo);
1.378 djm 1396: free(cp);
1.214 djm 1397: }
1.408 djm 1398:
1.522 dtucker 1399: if (options.identity_agent != NULL) {
1400: p = tilde_expand_filename(options.identity_agent, getuid());
1.544 djm 1401: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1402: free(p);
1403: free(options.identity_agent);
1404: options.identity_agent = cp;
1.586 dtucker 1405: }
1406:
1407: if (options.revoked_host_keys != NULL) {
1408: p = tilde_expand_filename(options.revoked_host_keys, getuid());
1409: cp = default_client_percent_dollar_expand(p, cinfo);
1410: free(p);
1411: free(options.revoked_host_keys);
1412: options.revoked_host_keys = cp;
1.522 dtucker 1413: }
1414:
1415: if (options.forward_agent_sock_path != NULL) {
1416: p = tilde_expand_filename(options.forward_agent_sock_path,
1417: getuid());
1.544 djm 1418: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1419: free(p);
1420: free(options.forward_agent_sock_path);
1421: options.forward_agent_sock_path = cp;
1.552 djm 1422: if (stat(options.forward_agent_sock_path, &st) != 0) {
1423: error("Cannot forward agent socket path \"%s\": %s",
1424: options.forward_agent_sock_path, strerror(errno));
1425: if (options.exit_on_forward_failure)
1426: cleanup_exit(255);
1427: }
1.532 dtucker 1428: }
1429:
1.545 djm 1430: if (options.num_system_hostfiles > 0 &&
1431: strcasecmp(options.system_hostfiles[0], "none") == 0) {
1432: if (options.num_system_hostfiles > 1)
1433: fatal("Invalid GlobalKnownHostsFiles: \"none\" "
1434: "appears with other entries");
1435: free(options.system_hostfiles[0]);
1436: options.system_hostfiles[0] = NULL;
1437: options.num_system_hostfiles = 0;
1438: }
1439:
1440: if (options.num_user_hostfiles > 0 &&
1441: strcasecmp(options.user_hostfiles[0], "none") == 0) {
1442: if (options.num_user_hostfiles > 1)
1443: fatal("Invalid UserKnownHostsFiles: \"none\" "
1444: "appears with other entries");
1445: free(options.user_hostfiles[0]);
1446: options.user_hostfiles[0] = NULL;
1447: options.num_user_hostfiles = 0;
1448: }
1.532 dtucker 1449: for (j = 0; j < options.num_user_hostfiles; j++) {
1.545 djm 1450: if (options.user_hostfiles[j] == NULL)
1451: continue;
1452: cp = tilde_expand_filename(options.user_hostfiles[j], getuid());
1453: p = default_client_percent_dollar_expand(cp, cinfo);
1454: if (strcmp(options.user_hostfiles[j], p) != 0)
1455: debug3("expanded UserKnownHostsFile '%s' -> "
1456: "'%s'", options.user_hostfiles[j], p);
1457: free(options.user_hostfiles[j]);
1458: free(cp);
1459: options.user_hostfiles[j] = p;
1.522 dtucker 1460: }
1461:
1.527 dtucker 1462: for (i = 0; i < options.num_local_forwards; i++) {
1463: if (options.local_forwards[i].listen_path != NULL) {
1464: cp = options.local_forwards[i].listen_path;
1465: p = options.local_forwards[i].listen_path =
1.544 djm 1466: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1467: if (strcmp(cp, p) != 0)
1468: debug3("expanded LocalForward listen path "
1469: "'%s' -> '%s'", cp, p);
1470: free(cp);
1471: }
1472: if (options.local_forwards[i].connect_path != NULL) {
1473: cp = options.local_forwards[i].connect_path;
1474: p = options.local_forwards[i].connect_path =
1.544 djm 1475: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1476: if (strcmp(cp, p) != 0)
1477: debug3("expanded LocalForward connect path "
1478: "'%s' -> '%s'", cp, p);
1479: free(cp);
1480: }
1481: }
1482:
1483: for (i = 0; i < options.num_remote_forwards; i++) {
1484: if (options.remote_forwards[i].listen_path != NULL) {
1485: cp = options.remote_forwards[i].listen_path;
1486: p = options.remote_forwards[i].listen_path =
1.544 djm 1487: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1488: if (strcmp(cp, p) != 0)
1489: debug3("expanded RemoteForward listen path "
1490: "'%s' -> '%s'", cp, p);
1491: free(cp);
1492: }
1493: if (options.remote_forwards[i].connect_path != NULL) {
1494: cp = options.remote_forwards[i].connect_path;
1495: p = options.remote_forwards[i].connect_path =
1.544 djm 1496: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1497: if (strcmp(cp, p) != 0)
1498: debug3("expanded RemoteForward connect path "
1499: "'%s' -> '%s'", cp, p);
1500: free(cp);
1501: }
1502: }
1503:
1.408 djm 1504: if (config_test) {
1505: dump_client_config(&options, host);
1506: exit(0);
1.508 djm 1507: }
1508:
1509: /* Expand SecurityKeyProvider if it refers to an environment variable */
1510: if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1511: strlen(options.sk_provider) > 1) {
1512: if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1.518 naddy 1513: debug("Authenticator provider %s did not resolve; "
1.508 djm 1514: "disabling", options.sk_provider);
1515: free(options.sk_provider);
1516: options.sk_provider = NULL;
1517: } else {
1518: debug2("resolved SecurityKeyProvider %s => %s",
1519: options.sk_provider, cp);
1520: free(options.sk_provider);
1521: options.sk_provider = xstrdup(cp);
1522: }
1.408 djm 1523: }
1.405 djm 1524:
1.312 djm 1525: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1526: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1527: if (options.control_path != NULL) {
1528: int sock;
1529: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1530: ssh_packet_set_connection(ssh, sock, sock);
1.499 djm 1531: ssh_packet_set_mux(ssh);
1.447 markus 1532: goto skip_connect;
1533: }
1534: }
1.401 djm 1535:
1536: /*
1537: * If hostname canonicalisation was not enabled, then we may not
1538: * have yet resolved the hostname. Do so now.
1539: */
1540: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1541: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1542: if ((addrs = resolve_host(host, options.port, 1,
1543: cname, sizeof(cname))) == NULL)
1544: cleanup_exit(255); /* resolve_host logs the error */
1545: }
1.214 djm 1546:
1.542 dtucker 1547: if (options.connection_timeout >= INT_MAX/1000)
1548: timeout_ms = INT_MAX;
1549: else
1550: timeout_ms = options.connection_timeout * 1000;
1.303 djm 1551:
1.77 markus 1552: /* Open a connection to the remote host. */
1.583 dtucker 1553: if (ssh_connect(ssh, host, options.host_arg, addrs, &hostaddr,
1554: options.port, options.connection_attempts,
1.488 dtucker 1555: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1556: exit(255);
1.31 markus 1557:
1.391 djm 1558: if (addrs != NULL)
1559: freeaddrinfo(addrs);
1560:
1.499 djm 1561: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1562: options.server_alive_count_max);
1563:
1.303 djm 1564: if (timeout_ms > 0)
1565: debug3("timeout: %d ms remain after connect", timeout_ms);
1566:
1.33 markus 1567: /*
1.485 dtucker 1568: * If we successfully made the connection and we have hostbased auth
1569: * enabled, load the public keys so we can later use the ssh-keysign
1570: * helper to sign challenges.
1.33 markus 1571: */
1.112 markus 1572: sensitive_data.nkeys = 0;
1573: sensitive_data.keys = NULL;
1.457 djm 1574: if (options.hostbased_authentication) {
1.581 dtucker 1575: int loaded = 0;
1576:
1.486 dtucker 1577: sensitive_data.nkeys = 10;
1.274 deraadt 1578: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.578 jsg 1579: sizeof(*sensitive_data.keys));
1.483 markus 1580:
1581: /* XXX check errors? */
1.486 dtucker 1582: #define L_PUBKEY(p,o) do { \
1583: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1584: fatal_f("pubkey out of array bounds"); \
1.483 markus 1585: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.576 djm 1586: &(sensitive_data.keys[o]), p, "pubkey"); \
1.581 dtucker 1587: if (sensitive_data.keys[o] != NULL) { \
1.572 djm 1588: debug2("hostbased key %d: %s key from \"%s\"", o, \
1589: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.581 dtucker 1590: loaded++; \
1591: } \
1.486 dtucker 1592: } while (0)
1593: #define L_CERT(p,o) do { \
1594: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1595: fatal_f("cert out of array bounds"); \
1.576 djm 1596: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), \
1597: &(sensitive_data.keys[o]), p, "cert"); \
1.581 dtucker 1598: if (sensitive_data.keys[o] != NULL) { \
1.572 djm 1599: debug2("hostbased key %d: %s cert from \"%s\"", o, \
1600: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.581 dtucker 1601: loaded++; \
1602: } \
1.486 dtucker 1603: } while (0)
1.177 markus 1604:
1.485 dtucker 1605: if (options.hostbased_authentication == 1) {
1.486 dtucker 1606: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1607: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1608: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1609: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1610: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1611: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1612: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1613: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1614: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1615: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.581 dtucker 1616: if (loaded == 0)
1617: debug("HostbasedAuthentication enabled but no "
1618: "local public host keys could be loaded.");
1.173 markus 1619: }
1.367 djm 1620: }
1.31 markus 1621:
1.104 markus 1622: /* load options.identity_files */
1.544 djm 1623: load_public_identity_files(cinfo);
1.439 markus 1624:
1.476 djm 1625: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1626: if (options.identity_agent &&
1627: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1628: if (strcmp(options.identity_agent, "none") == 0) {
1629: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1630: } else {
1.522 dtucker 1631: cp = options.identity_agent;
1.528 dtucker 1632: /* legacy (limited) format */
1633: if (cp[0] == '$' && cp[1] != '{') {
1.494 djm 1634: if (!valid_env_name(cp + 1)) {
1635: fatal("Invalid IdentityAgent "
1636: "environment variable name %s", cp);
1637: }
1638: if ((p = getenv(cp + 1)) == NULL)
1639: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1640: else
1641: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1642: } else {
1643: /* identity_agent specifies a path directly */
1644: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1645: }
1.510 djm 1646: }
1647: }
1648:
1.522 dtucker 1649: if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1.526 djm 1650: cp = options.forward_agent_sock_path;
1.510 djm 1651: if (cp[0] == '$') {
1652: if (!valid_env_name(cp + 1)) {
1653: fatal("Invalid ForwardAgent environment variable name %s", cp);
1654: }
1655: if ((p = getenv(cp + 1)) != NULL)
1.566 dtucker 1656: forward_agent_sock_path = xstrdup(p);
1.510 djm 1657: else
1658: options.forward_agent = 0;
1659: free(cp);
1660: } else {
1661: forward_agent_sock_path = cp;
1.439 markus 1662: }
1663: }
1.104 markus 1664:
1665: /* Expand ~ in known host file names. */
1.361 djm 1666: tilde_expand_paths(options.system_hostfiles,
1667: options.num_system_hostfiles);
1668: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1669:
1.512 dtucker 1670: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1671:
1.316 djm 1672: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1673: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.546 djm 1674: options.port, pw, timeout_ms, cinfo);
1.31 markus 1675:
1.112 markus 1676: /* We no longer need the private host keys. Clear them now. */
1677: if (sensitive_data.nkeys != 0) {
1678: for (i = 0; i < sensitive_data.nkeys; i++) {
1679: if (sensitive_data.keys[i] != NULL) {
1680: /* Destroys contents safely */
1681: debug3("clear hostkey %d", i);
1.483 markus 1682: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1683: sensitive_data.keys[i] = NULL;
1684: }
1685: }
1.378 djm 1686: free(sensitive_data.keys);
1.134 markus 1687: }
1688: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1689: free(options.identity_files[i]);
1690: options.identity_files[i] = NULL;
1.134 markus 1691: if (options.identity_keys[i]) {
1.483 markus 1692: sshkey_free(options.identity_keys[i]);
1.134 markus 1693: options.identity_keys[i] = NULL;
1694: }
1.112 markus 1695: }
1.426 djm 1696: for (i = 0; i < options.num_certificate_files; i++) {
1697: free(options.certificate_files[i]);
1698: options.certificate_files[i] = NULL;
1699: }
1.553 djm 1700:
1701: #ifdef ENABLE_PKCS11
1702: (void)pkcs11_del_provider(options.pkcs11_provider);
1703: #endif
1.31 markus 1704:
1.447 markus 1705: skip_connect:
1.544 djm 1706: exit_status = ssh_session2(ssh, cinfo);
1707: ssh_conn_info_free(cinfo);
1.499 djm 1708: ssh_packet_close(ssh);
1.186 djm 1709:
1.312 djm 1710: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1711: unlink(options.control_path);
1712:
1.353 djm 1713: /* Kill ProxyCommand if it is running. */
1714: ssh_kill_proxy_command();
1.186 djm 1715:
1.45 markus 1716: return exit_status;
1717: }
1718:
1.344 djm 1719: static void
1720: control_persist_detach(void)
1721: {
1722: pid_t pid;
1723:
1.540 djm 1724: debug_f("backgrounding master process");
1.344 djm 1725:
1.473 djm 1726: /*
1727: * master (current process) into the background, and make the
1728: * foreground process a client of the backgrounded master.
1729: */
1.344 djm 1730: switch ((pid = fork())) {
1731: case -1:
1.540 djm 1732: fatal_f("fork: %s", strerror(errno));
1.344 djm 1733: case 0:
1734: /* Child: master process continues mainloop */
1.473 djm 1735: break;
1736: default:
1.531 djm 1737: /* Parent: set up mux client to connect to backgrounded master */
1.540 djm 1738: debug2_f("background process is %ld", (long)pid);
1.563 djm 1739: options.stdin_null = ostdin_null_flag;
1.359 djm 1740: options.request_tty = orequest_tty;
1.344 djm 1741: tty_flag = otty_flag;
1.561 djm 1742: options.session_type = osession_type;
1.473 djm 1743: close(muxserver_sock);
1744: muxserver_sock = -1;
1.351 markus 1745: options.control_master = SSHCTL_MASTER_NO;
1.587 dtucker 1746: (void)muxclient(options.control_path);
1.344 djm 1747: /* muxclient() doesn't return on success. */
1.473 djm 1748: fatal("Failed to connect to new control master");
1749: }
1.537 djm 1750: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1751: error_f("stdfd_devnull failed");
1.381 djm 1752: daemon(1, 1);
1.362 djm 1753: setproctitle("%s [mux]", options.control_path);
1.344 djm 1754: }
1755:
1756: /* Do fork() after authentication. Used by "ssh -f" */
1757: static void
1758: fork_postauth(void)
1759: {
1760: if (need_controlpersist_detach)
1761: control_persist_detach();
1762: debug("forking to background");
1.564 djm 1763: options.fork_after_authentication = 0;
1.505 deraadt 1764: if (daemon(1, 1) == -1)
1.344 djm 1765: fatal("daemon() failed: %.200s", strerror(errno));
1.537 djm 1766: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1767: error_f("stdfd_devnull failed");
1.344 djm 1768: }
1769:
1.523 djm 1770: static void
1771: forwarding_success(void)
1772: {
1.524 djm 1773: if (forward_confirms_pending == -1)
1774: return;
1775: if (--forward_confirms_pending == 0) {
1.540 djm 1776: debug_f("all expected forwarding replies received");
1.564 djm 1777: if (options.fork_after_authentication)
1.523 djm 1778: fork_postauth();
1.524 djm 1779: } else {
1.540 djm 1780: debug2_f("%d expected forwarding replies remaining",
1781: forward_confirms_pending);
1.523 djm 1782: }
1783: }
1784:
1.315 djm 1785: /* Callback for remote forward global requests */
1786: static void
1.463 djm 1787: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1788: {
1.406 millert 1789: struct Forward *rfwd = (struct Forward *)ctxt;
1.499 djm 1790: u_int port;
1791: int r;
1.315 djm 1792:
1.324 djm 1793: /* XXX verbose() on failure? */
1.404 markus 1794: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1795: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1796: rfwd->listen_path ? rfwd->listen_path :
1797: rfwd->listen_host ? rfwd->listen_host : "",
1798: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1799: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1800: rfwd->connect_host, rfwd->connect_port);
1801: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1802: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1.499 djm 1803: if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1.540 djm 1804: fatal_fr(r, "parse packet");
1.499 djm 1805: if (port > 65535) {
1806: error("Invalid allocated port %u for remote "
1807: "forward to %s:%d", port,
1808: rfwd->connect_host, rfwd->connect_port);
1809: /* Ensure failure processing runs below */
1810: type = SSH2_MSG_REQUEST_FAILURE;
1811: channel_update_permission(ssh,
1812: rfwd->handle, -1);
1813: } else {
1814: rfwd->allocated_port = (int)port;
1815: logit("Allocated port %u for remote "
1816: "forward to %s:%d",
1.569 dtucker 1817: rfwd->allocated_port, rfwd->connect_path ?
1818: rfwd->connect_path : rfwd->connect_host,
1.499 djm 1819: rfwd->connect_port);
1820: channel_update_permission(ssh,
1821: rfwd->handle, rfwd->allocated_port);
1822: }
1.366 markus 1823: } else {
1.480 djm 1824: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1825: }
1.324 djm 1826: }
1.468 djm 1827:
1.315 djm 1828: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1829: if (options.exit_on_forward_failure) {
1830: if (rfwd->listen_path != NULL)
1831: fatal("Error: remote port forwarding failed "
1832: "for listen path %s", rfwd->listen_path);
1833: else
1834: fatal("Error: remote port forwarding failed "
1835: "for listen port %d", rfwd->listen_port);
1836: } else {
1837: if (rfwd->listen_path != NULL)
1838: logit("Warning: remote port forwarding failed "
1839: "for listen path %s", rfwd->listen_path);
1840: else
1841: logit("Warning: remote port forwarding failed "
1842: "for listen port %d", rfwd->listen_port);
1843: }
1.315 djm 1844: }
1.523 djm 1845: forwarding_success();
1.315 djm 1846: }
1847:
1.126 itojun 1848: static void
1.582 djm 1849: client_cleanup_stdio_fwd(struct ssh *ssh, int id, int force, void *arg)
1.331 dtucker 1850: {
1851: debug("stdio forwarding: done");
1852: cleanup_exit(0);
1853: }
1854:
1.368 djm 1855: static void
1.463 djm 1856: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1857: {
1858: if (!success)
1859: fatal("stdio forwarding failed");
1860: }
1861:
1862: static void
1.523 djm 1863: ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
1864: {
1865: if (!success) {
1866: error("Tunnel forwarding failed");
1867: if (options.exit_on_forward_failure)
1868: cleanup_exit(255);
1869: }
1870:
1.540 djm 1871: debug_f("tunnel forward established, id=%d", id);
1.523 djm 1872: forwarding_success();
1873: }
1874:
1875: static void
1.463 djm 1876: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1877: {
1878: Channel *c;
1.332 djm 1879: int in, out;
1.331 dtucker 1880:
1.441 dtucker 1881: if (options.stdio_forward_host == NULL)
1.368 djm 1882: return;
1883:
1.540 djm 1884: debug3_f("%s:%d", options.stdio_forward_host,
1.441 dtucker 1885: options.stdio_forward_port);
1.332 djm 1886:
1.505 deraadt 1887: if ((in = dup(STDIN_FILENO)) == -1 ||
1888: (out = dup(STDOUT_FILENO)) == -1)
1.557 djm 1889: fatal_f("dup() in/out failed");
1.463 djm 1890: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.557 djm 1891: options.stdio_forward_port, in, out,
1892: CHANNEL_NONBLOCK_STDIO)) == NULL)
1.540 djm 1893: fatal_f("channel_connect_stdio_fwd failed");
1.463 djm 1894: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1895: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1896: }
1897:
1898: static void
1.551 markus 1899: ssh_init_forward_permissions(struct ssh *ssh, const char *what, char **opens,
1900: u_int num_opens)
1901: {
1902: u_int i;
1903: int port;
1.573 dtucker 1904: char *addr, *arg, *oarg;
1.551 markus 1905: int where = FORWARD_LOCAL;
1906:
1907: channel_clear_permission(ssh, FORWARD_ADM, where);
1908: if (num_opens == 0)
1909: return; /* permit any */
1910:
1911: /* handle keywords: "any" / "none" */
1912: if (num_opens == 1 && strcmp(opens[0], "any") == 0)
1913: return;
1914: if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
1915: channel_disable_admin(ssh, where);
1916: return;
1917: }
1918: /* Otherwise treat it as a list of permitted host:port */
1919: for (i = 0; i < num_opens; i++) {
1920: oarg = arg = xstrdup(opens[i]);
1.573 dtucker 1921: addr = hpdelim(&arg);
1922: if (addr == NULL)
1.551 markus 1923: fatal_f("missing host in %s", what);
1924: addr = cleanhostname(addr);
1925: if (arg == NULL || ((port = permitopen_port(arg)) < 0))
1926: fatal_f("bad port number in %s", what);
1927: /* Send it to channels layer */
1928: channel_add_permission(ssh, FORWARD_ADM,
1929: where, addr, port);
1930: free(oarg);
1931: }
1932: }
1933:
1934: static void
1.466 djm 1935: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1936: {
1.86 markus 1937: int success = 0;
1.70 markus 1938: int i;
1.551 markus 1939:
1940: ssh_init_forward_permissions(ssh, "permitremoteopen",
1941: options.permitted_remote_opens,
1942: options.num_permitted_remote_opens);
1.331 dtucker 1943:
1.524 djm 1944: if (options.exit_on_forward_failure)
1945: forward_confirms_pending = 0; /* track pending requests */
1.70 markus 1946: /* Initiate local TCP/IP port forwardings. */
1947: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1948: debug("Local connections to %.200s:%d forwarded to remote "
1949: "address %.200s:%d",
1.406 millert 1950: (options.local_forwards[i].listen_path != NULL) ?
1951: options.local_forwards[i].listen_path :
1.234 deraadt 1952: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1953: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1954: options.local_forwards[i].listen_host,
1955: options.local_forwards[i].listen_port,
1.406 millert 1956: (options.local_forwards[i].connect_path != NULL) ?
1957: options.local_forwards[i].connect_path :
1.232 djm 1958: options.local_forwards[i].connect_host,
1959: options.local_forwards[i].connect_port);
1.463 djm 1960: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1961: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1962: }
1.283 markus 1963: if (i > 0 && success != i && options.exit_on_forward_failure)
1964: fatal("Could not request local forwarding.");
1.86 markus 1965: if (i > 0 && success == 0)
1966: error("Could not request local forwarding.");
1.70 markus 1967:
1968: /* Initiate remote TCP/IP port forwardings. */
1969: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1970: debug("Remote connections from %.200s:%d forwarded to "
1971: "local address %.200s:%d",
1.406 millert 1972: (options.remote_forwards[i].listen_path != NULL) ?
1973: options.remote_forwards[i].listen_path :
1.248 djm 1974: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1975: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1976: options.remote_forwards[i].listen_port,
1.406 millert 1977: (options.remote_forwards[i].connect_path != NULL) ?
1978: options.remote_forwards[i].connect_path :
1.232 djm 1979: options.remote_forwards[i].connect_host,
1980: options.remote_forwards[i].connect_port);
1.523 djm 1981: if ((options.remote_forwards[i].handle =
1.463 djm 1982: channel_request_remote_forwarding(ssh,
1.523 djm 1983: &options.remote_forwards[i])) >= 0) {
1.463 djm 1984: client_register_global_confirm(
1985: ssh_confirm_remote_forward,
1.366 markus 1986: &options.remote_forwards[i]);
1.523 djm 1987: forward_confirms_pending++;
1988: } else if (options.exit_on_forward_failure)
1989: fatal("Could not request remote forwarding.");
1990: else
1991: logit("Warning: Could not request remote forwarding.");
1.70 markus 1992: }
1.301 djm 1993:
1994: /* Initiate tunnel forwarding. */
1995: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1996: if ((*ifname = client_request_tun_fwd(ssh,
1997: options.tun_open, options.tun_local,
1.523 djm 1998: options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
1999: forward_confirms_pending++;
2000: else if (options.exit_on_forward_failure)
2001: fatal("Could not request tunnel forwarding.");
2002: else
2003: error("Could not request tunnel forwarding.");
1.524 djm 2004: }
2005: if (forward_confirms_pending > 0) {
1.540 djm 2006: debug_f("expecting replies for %d forwards",
1.524 djm 2007: forward_confirms_pending);
1.468 djm 2008: }
1.70 markus 2009: }
2010:
1.126 itojun 2011: static void
1.70 markus 2012: check_agent_present(void)
2013: {
1.412 djm 2014: int r;
2015:
1.70 markus 2016: if (options.forward_agent) {
1.254 djm 2017: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 2018: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 2019: options.forward_agent = 0;
1.412 djm 2020: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.540 djm 2021: debug_r(r, "ssh_get_authentication_socket");
1.412 djm 2022: }
1.70 markus 2023: }
2024: }
2025:
1.214 djm 2026: static void
1.463 djm 2027: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 2028: {
1.215 djm 2029: extern char **environ;
1.558 djm 2030: const char *display, *term;
1.499 djm 2031: int r, interactive = tty_flag;
1.433 djm 2032: char *proto = NULL, *data = NULL;
1.337 djm 2033:
2034: if (!success)
1.580 djm 2035: return; /* No need for error message, channels code sends one */
1.215 djm 2036:
1.248 djm 2037: display = getenv("DISPLAY");
1.417 djm 2038: if (display == NULL && options.forward_x11)
2039: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 2040: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 2041: options.xauth_location, options.forward_x11_trusted,
2042: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 2043: /* Request forwarding with authentication spoofing. */
1.316 djm 2044: debug("Requesting X11 forwarding with authentication "
2045: "spoofing.");
1.463 djm 2046: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 2047: data, 1);
1.463 djm 2048: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 2049: /* XXX exit_on_forward_failure */
1.80 markus 2050: interactive = 1;
1.50 markus 2051: }
2052:
1.70 markus 2053: check_agent_present();
2054: if (options.forward_agent) {
2055: debug("Requesting authentication agent forwarding.");
1.463 djm 2056: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 2057: if ((r = sshpkt_send(ssh)) != 0)
1.540 djm 2058: fatal_fr(r, "send packet");
1.212 djm 2059: }
1.369 dtucker 2060:
2061: /* Tell the packet module whether this is an interactive session. */
1.499 djm 2062: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 2063: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 2064:
1.558 djm 2065: if ((term = lookup_env_in_list("TERM", options.setenv,
2066: options.num_setenv)) == NULL || *term == '\0')
2067: term = getenv("TERM");
1.562 djm 2068: client_session2_setup(ssh, id, tty_flag,
2069: options.session_type == SESSION_TYPE_SUBSYSTEM, term,
1.482 markus 2070: NULL, fileno(stdin), command, environ);
1.45 markus 2071: }
2072:
1.143 markus 2073: /* open new channel for a session */
1.126 itojun 2074: static int
1.463 djm 2075: ssh_session2_open(struct ssh *ssh)
1.45 markus 2076: {
1.118 markus 2077: Channel *c;
2078: int window, packetmax, in, out, err;
1.60 markus 2079:
1.563 djm 2080: if (options.stdin_null) {
1.93 itojun 2081: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 2082: } else {
2083: in = dup(STDIN_FILENO);
2084: }
1.60 markus 2085: out = dup(STDOUT_FILENO);
2086: err = dup(STDERR_FILENO);
1.45 markus 2087:
1.505 deraadt 2088: if (in == -1 || out == -1 || err == -1)
1.62 markus 2089: fatal("dup() in/out/err failed");
1.45 markus 2090:
1.65 markus 2091: window = CHAN_SES_WINDOW_DEFAULT;
2092: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 2093: if (tty_flag) {
2094: window >>= 1;
2095: packetmax >>= 1;
1.45 markus 2096: }
1.463 djm 2097: c = channel_new(ssh,
1.45 markus 2098: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 2099: window, packetmax, CHAN_EXTENDED_WRITE,
1.557 djm 2100: "client-session", CHANNEL_NONBLOCK_STDIO);
1.45 markus 2101:
1.540 djm 2102: debug3_f("channel_new: %d", c->self);
1.106 markus 2103:
1.463 djm 2104: channel_send_open(ssh, c->self);
1.560 djm 2105: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2106: channel_register_open_confirm(ssh, c->self,
1.310 djm 2107: ssh_session2_setup, NULL);
1.106 markus 2108:
1.118 markus 2109: return c->self;
1.106 markus 2110: }
2111:
1.126 itojun 2112: static int
1.544 djm 2113: ssh_session2(struct ssh *ssh, const struct ssh_conn_info *cinfo)
1.106 markus 2114: {
1.537 djm 2115: int r, id = -1;
1.466 djm 2116: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 2117:
2118: /* XXX should be pre-session */
1.368 djm 2119: if (!options.control_persist)
1.463 djm 2120: ssh_init_stdio_forwarding(ssh);
1.466 djm 2121:
2122: ssh_init_forwarding(ssh, &tun_fwd_ifname);
2123:
2124: if (options.local_command != NULL) {
2125: debug3("expanding LocalCommand: %s", options.local_command);
2126: cp = options.local_command;
2127: options.local_command = percent_expand(cp,
1.546 djm 2128: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.466 djm 2129: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2130: (char *)NULL);
2131: debug3("expanded LocalCommand: %s", options.local_command);
2132: free(cp);
2133: }
1.106 markus 2134:
1.344 djm 2135: /* Start listening for multiplex clients */
1.499 djm 2136: if (!ssh_packet_get_mux(ssh))
1.463 djm 2137: muxserver_listen(ssh);
1.344 djm 2138:
1.473 djm 2139: /*
1.368 djm 2140: * If we are in control persist mode and have a working mux listen
2141: * socket, then prepare to background ourselves and have a foreground
1.531 djm 2142: * client attach as a control client.
1.368 djm 2143: * NB. we must save copies of the flags that we override for
1.531 djm 2144: * the backgrounding, since we defer attachment of the client until
1.344 djm 2145: * after the connection is fully established (in particular,
2146: * async rfwd replies have been received for ExitOnForwardFailure).
2147: */
1.473 djm 2148: if (options.control_persist && muxserver_sock != -1) {
1.563 djm 2149: ostdin_null_flag = options.stdin_null;
1.560 djm 2150: osession_type = options.session_type;
1.359 djm 2151: orequest_tty = options.request_tty;
1.344 djm 2152: otty_flag = tty_flag;
1.563 djm 2153: options.stdin_null = 1;
1.560 djm 2154: options.session_type = SESSION_TYPE_NONE;
1.473 djm 2155: tty_flag = 0;
1.564 djm 2156: if (!options.fork_after_authentication &&
1.562 djm 2157: (osession_type != SESSION_TYPE_NONE ||
2158: options.stdio_forward_host != NULL))
1.344 djm 2159: need_controlpersist_detach = 1;
1.564 djm 2160: options.fork_after_authentication = 1;
1.473 djm 2161: }
1.368 djm 2162: /*
2163: * ControlPersist mux listen socket setup failed, attempt the
2164: * stdio forward setup that we skipped earlier.
2165: */
2166: if (options.control_persist && muxserver_sock == -1)
1.463 djm 2167: ssh_init_stdio_forwarding(ssh);
1.344 djm 2168:
1.560 djm 2169: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2170: id = ssh_session2_open(ssh);
1.379 djm 2171: else {
1.499 djm 2172: ssh_packet_set_interactive(ssh,
1.379 djm 2173: options.control_master == SSHCTL_MASTER_NO,
2174: options.ip_qos_interactive, options.ip_qos_bulk);
2175: }
1.314 djm 2176:
2177: /* If we don't expect to open a new session, then disallow it */
1.319 markus 2178: if (options.control_master == SSHCTL_MASTER_NO &&
1.549 djm 2179: (ssh->compat & SSH_NEW_OPENSSH)) {
1.314 djm 2180: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 2181: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2182: (r = sshpkt_put_cstring(ssh,
2183: "no-more-sessions@openssh.com")) != 0 ||
2184: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2185: (r = sshpkt_send(ssh)) != 0)
1.540 djm 2186: fatal_fr(r, "send packet");
1.314 djm 2187: }
1.255 reyk 2188:
2189: /* Execute a local command */
2190: if (options.local_command != NULL &&
2191: options.permit_local_command)
2192: ssh_local_cmd(options.local_command);
1.467 djm 2193:
2194: /*
2195: * stdout is now owned by the session channel; clobber it here
2196: * so future channel closes are propagated to the local fd.
2197: * NB. this can only happen after LocalCommand has completed,
2198: * as it may want to write to stdout.
2199: */
1.537 djm 2200: if (!need_controlpersist_detach && stdfd_devnull(0, 1, 0) == -1)
1.540 djm 2201: error_f("stdfd_devnull failed");
1.301 djm 2202:
1.342 djm 2203: /*
2204: * If requested and we are not interested in replies to remote
2205: * forwarding requests, then let ssh continue in the background.
2206: */
1.564 djm 2207: if (options.fork_after_authentication) {
1.344 djm 2208: if (options.exit_on_forward_failure &&
2209: options.num_remote_forwards > 0) {
2210: debug("deferring postauth fork until remote forward "
2211: "confirmation received");
2212: } else
2213: fork_postauth();
1.318 djm 2214: }
1.31 markus 2215:
1.463 djm 2216: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2217: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2218: }
2219:
1.426 djm 2220: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2221: static void
1.544 djm 2222: load_public_identity_files(const struct ssh_conn_info *cinfo)
1.104 markus 2223: {
1.466 djm 2224: char *filename, *cp;
1.460 markus 2225: struct sshkey *public;
1.426 djm 2226: int i;
2227: u_int n_ids, n_certs;
1.335 djm 2228: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2229: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2230: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2231: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2232: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2233: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2234: #ifdef ENABLE_PKCS11
1.514 djm 2235: struct sshkey **keys = NULL;
2236: char **comments = NULL;
1.333 markus 2237: int nkeys;
1.335 djm 2238: #endif /* PKCS11 */
1.104 markus 2239:
1.426 djm 2240: n_ids = n_certs = 0;
1.398 tedu 2241: memset(identity_files, 0, sizeof(identity_files));
2242: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2243: memset(identity_file_userprovided, 0,
2244: sizeof(identity_file_userprovided));
1.426 djm 2245: memset(certificate_files, 0, sizeof(certificate_files));
2246: memset(certificates, 0, sizeof(certificates));
1.484 djm 2247: memset(certificate_file_userprovided, 0,
2248: sizeof(certificate_file_userprovided));
1.335 djm 2249:
2250: #ifdef ENABLE_PKCS11
1.333 markus 2251: if (options.pkcs11_provider != NULL &&
1.167 markus 2252: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2253: (pkcs11_init(!options.batch_mode) == 0) &&
2254: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1.514 djm 2255: &keys, &comments)) > 0) {
1.333 markus 2256: for (i = 0; i < nkeys; i++) {
1.335 djm 2257: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2258: sshkey_free(keys[i]);
1.514 djm 2259: free(comments[i]);
1.335 djm 2260: continue;
2261: }
2262: identity_keys[n_ids] = keys[i];
1.514 djm 2263: identity_files[n_ids] = comments[i]; /* transferred */
1.335 djm 2264: n_ids++;
1.167 markus 2265: }
1.378 djm 2266: free(keys);
1.514 djm 2267: free(comments);
1.127 markus 2268: }
1.333 markus 2269: #endif /* ENABLE_PKCS11 */
1.335 djm 2270: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2271: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2272: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2273: free(options.identity_files[i]);
1.426 djm 2274: options.identity_files[i] = NULL;
1.335 djm 2275: continue;
2276: }
1.490 dtucker 2277: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.544 djm 2278: filename = default_client_percent_dollar_expand(cp, cinfo);
1.378 djm 2279: free(cp);
1.483 markus 2280: check_load(sshkey_load_public(filename, &public, NULL),
1.576 djm 2281: &public, filename, "pubkey");
1.131 millert 2282: debug("identity file %s type %d", filename,
2283: public ? public->type : -1);
1.378 djm 2284: free(options.identity_files[i]);
1.335 djm 2285: identity_files[n_ids] = filename;
2286: identity_keys[n_ids] = public;
1.484 djm 2287: identity_file_userprovided[n_ids] =
2288: options.identity_file_userprovided[i];
1.335 djm 2289: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2290: continue;
2291:
1.426 djm 2292: /*
2293: * If no certificates have been explicitly listed then try
2294: * to add the default certificate variant too.
2295: */
2296: if (options.num_certificate_files != 0)
2297: continue;
1.335 djm 2298: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2299: check_load(sshkey_load_public(cp, &public, NULL),
1.576 djm 2300: &public, filename, "pubkey");
1.335 djm 2301: debug("identity file %s type %d", cp,
2302: public ? public->type : -1);
2303: if (public == NULL) {
1.378 djm 2304: free(cp);
1.335 djm 2305: continue;
2306: }
1.483 markus 2307: if (!sshkey_is_cert(public)) {
1.540 djm 2308: debug_f("key %s type %s is not a certificate",
2309: cp, sshkey_type(public));
1.483 markus 2310: sshkey_free(public);
1.378 djm 2311: free(cp);
1.335 djm 2312: continue;
2313: }
1.448 djm 2314: /* NB. leave filename pointing to private key */
2315: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2316: identity_keys[n_ids] = public;
1.484 djm 2317: identity_file_userprovided[n_ids] =
2318: options.identity_file_userprovided[i];
1.335 djm 2319: n_ids++;
2320: }
1.426 djm 2321:
2322: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
1.540 djm 2323: fatal_f("too many certificates");
1.426 djm 2324: for (i = 0; i < options.num_certificate_files; i++) {
2325: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2326: getuid());
1.544 djm 2327: filename = default_client_percent_dollar_expand(cp, cinfo);
1.426 djm 2328: free(cp);
2329:
1.483 markus 2330: check_load(sshkey_load_public(filename, &public, NULL),
1.576 djm 2331: &public, filename, "certificate");
1.426 djm 2332: debug("certificate file %s type %d", filename,
2333: public ? public->type : -1);
2334: free(options.certificate_files[i]);
2335: options.certificate_files[i] = NULL;
2336: if (public == NULL) {
2337: free(filename);
2338: continue;
2339: }
1.483 markus 2340: if (!sshkey_is_cert(public)) {
1.540 djm 2341: debug_f("key %s type %s is not a certificate",
2342: filename, sshkey_type(public));
1.483 markus 2343: sshkey_free(public);
1.426 djm 2344: free(filename);
2345: continue;
2346: }
2347: certificate_files[n_certs] = filename;
2348: certificates[n_certs] = public;
1.484 djm 2349: certificate_file_userprovided[n_certs] =
2350: options.certificate_file_userprovided[i];
1.426 djm 2351: ++n_certs;
2352: }
2353:
1.335 djm 2354: options.num_identity_files = n_ids;
2355: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2356: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2357: memcpy(options.identity_file_userprovided,
2358: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2359:
2360: options.num_certificate_files = n_certs;
2361: memcpy(options.certificate_files,
2362: certificate_files, sizeof(certificate_files));
2363: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2364: memcpy(options.certificate_file_userprovided,
2365: certificate_file_userprovided,
2366: sizeof(certificate_file_userprovided));
1.214 djm 2367: }
1.352 djm 2368:
2369: static void
2370: main_sigchld_handler(int sig)
2371: {
2372: int save_errno = errno;
2373: pid_t pid;
2374: int status;
2375:
2376: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2377: (pid == -1 && errno == EINTR))
1.352 djm 2378: ;
2379: errno = save_errno;
2380: }