Annotation of src/usr.bin/ssh/ssh.c, Revision 1.589
1.589 ! djm 1: /* $OpenBSD: ssh.c,v 1.588 2023/04/26 01:36:03 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)) {
1.441 dtucker 884: options.stdio_forward_host = fwd.listen_host;
885: options.stdio_forward_port = fwd.listen_port;
1.378 djm 886: free(fwd.connect_host);
1.331 dtucker 887: } else {
888: fprintf(stderr,
889: "Bad stdio forwarding specification '%s'\n",
890: optarg);
891: exit(255);
892: }
1.359 djm 893: options.request_tty = REQUEST_TTY_NO;
1.560 djm 894: options.session_type = SESSION_TYPE_NONE;
1.331 dtucker 895: break;
1.31 markus 896: case 'q':
897: options.log_level = SYSLOG_LEVEL_QUIET;
898: break;
899: case 'e':
900: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 901: (u_char) optarg[1] >= 64 &&
902: (u_char) optarg[1] < 128)
1.78 markus 903: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 904: else if (strlen(optarg) == 1)
1.78 markus 905: options.escape_char = (u_char) optarg[0];
1.31 markus 906: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 907: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 908: else {
1.128 fgsch 909: fprintf(stderr, "Bad escape character '%s'.\n",
910: optarg);
1.257 dtucker 911: exit(255);
1.31 markus 912: }
913: break;
914: case 'c':
1.506 naddy 915: if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
1.420 djm 916: optarg + 1 : optarg)) {
917: fprintf(stderr, "Unknown cipher type '%s'\n",
918: optarg);
919: exit(255);
1.95 markus 920: }
1.456 djm 921: free(options.ciphers);
922: options.ciphers = xstrdup(optarg);
1.95 markus 923: break;
924: case 'm':
1.422 dtucker 925: if (mac_valid(optarg)) {
926: free(options.macs);
1.95 markus 927: options.macs = xstrdup(optarg);
1.422 dtucker 928: } else {
1.128 fgsch 929: fprintf(stderr, "Unknown mac type '%s'\n",
930: optarg);
1.257 dtucker 931: exit(255);
1.31 markus 932: }
933: break;
1.214 djm 934: case 'M':
1.242 djm 935: if (options.control_master == SSHCTL_MASTER_YES)
936: options.control_master = SSHCTL_MASTER_ASK;
937: else
938: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 939: break;
1.31 markus 940: case 'p':
1.465 millert 941: if (options.port == -1) {
942: options.port = a2port(optarg);
943: if (options.port <= 0) {
944: fprintf(stderr, "Bad port '%s'\n",
945: optarg);
946: exit(255);
947: }
1.109 markus 948: }
1.31 markus 949: break;
950: case 'l':
1.465 millert 951: if (options.user == NULL)
952: options.user = optarg;
1.31 markus 953: break;
1.141 stevesk 954:
955: case 'L':
1.324 djm 956: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 957: add_local_forward(&options, &fwd);
958: else {
1.128 fgsch 959: fprintf(stderr,
1.232 djm 960: "Bad local forwarding specification '%s'\n",
1.128 fgsch 961: optarg);
1.257 dtucker 962: exit(255);
1.31 markus 963: }
1.232 djm 964: break;
965:
966: case 'R':
1.464 markus 967: if (parse_forward(&fwd, optarg, 0, 1) ||
968: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 969: add_remote_forward(&options, &fwd);
970: } else {
1.128 fgsch 971: fprintf(stderr,
1.232 djm 972: "Bad remote forwarding specification "
973: "'%s'\n", optarg);
1.257 dtucker 974: exit(255);
1.31 markus 975: }
976: break;
1.108 markus 977:
978: case 'D':
1.324 djm 979: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 980: add_local_forward(&options, &fwd);
1.232 djm 981: } else {
1.322 stevesk 982: fprintf(stderr,
983: "Bad dynamic forwarding specification "
984: "'%s'\n", optarg);
1.257 dtucker 985: exit(255);
1.109 markus 986: }
1.108 markus 987: break;
988:
1.31 markus 989: case 'C':
1.513 dtucker 990: #ifdef WITH_ZLIB
1.31 markus 991: options.compression = 1;
1.513 dtucker 992: #else
993: error("Compression not supported, disabling.");
994: #endif
1.31 markus 995: break;
1.45 markus 996: case 'N':
1.560 djm 997: if (options.session_type != -1 &&
998: options.session_type != SESSION_TYPE_NONE)
999: fatal("Cannot specify -N with -s/SessionType");
1000: options.session_type = SESSION_TYPE_NONE;
1.359 djm 1001: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1002: break;
1003: case 'T':
1.359 djm 1004: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1005: break;
1.31 markus 1006: case 'o':
1.205 markus 1007: line = xstrdup(optarg);
1.408 djm 1008: if (process_config_line(&options, pw,
1009: host ? host : "", host ? host : "", line,
1010: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 1011: exit(255);
1.378 djm 1012: free(line);
1.31 markus 1013: break;
1.85 djm 1014: case 's':
1.560 djm 1015: if (options.session_type != -1 &&
1016: options.session_type != SESSION_TYPE_SUBSYSTEM)
1017: fatal("Cannot specify -s with -N/SessionType");
1018: options.session_type = SESSION_TYPE_SUBSYSTEM;
1.117 markus 1019: break;
1.214 djm 1020: case 'S':
1.431 mmcc 1021: free(options.control_path);
1.214 djm 1022: options.control_path = xstrdup(optarg);
1023: break;
1.117 markus 1024: case 'b':
1025: options.bind_address = optarg;
1.474 djm 1026: break;
1027: case 'B':
1028: options.bind_interface = optarg;
1.85 djm 1029: break;
1.139 markus 1030: case 'F':
1031: config = optarg;
1032: break;
1.31 markus 1033: default:
1034: usage();
1.1 deraadt 1035: }
1.31 markus 1036: }
1037:
1.462 djm 1038: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
1039: opt_terminated = 1;
1040:
1.128 fgsch 1041: ac -= optind;
1042: av += optind;
1043:
1.329 guenther 1044: if (ac > 0 && !host) {
1.465 millert 1045: int tport;
1046: char *tuser;
1047: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
1048: case -1:
1049: usage();
1050: break;
1051: case 0:
1052: if (options.user == NULL) {
1053: options.user = tuser;
1054: tuser = NULL;
1055: }
1056: free(tuser);
1057: if (options.port == -1 && tport != -1)
1058: options.port = tport;
1059: break;
1060: default:
1.128 fgsch 1061: p = xstrdup(*av);
1.188 markus 1062: cp = strrchr(p, '@');
1.465 millert 1063: if (cp != NULL) {
1064: if (cp == p)
1065: usage();
1066: if (options.user == NULL) {
1067: options.user = p;
1068: p = NULL;
1069: }
1070: *cp++ = '\0';
1071: host = xstrdup(cp);
1072: free(p);
1073: } else
1074: host = p;
1075: break;
1076: }
1.462 djm 1077: if (ac > 1 && !opt_terminated) {
1.189 millert 1078: optind = optreset = 1;
1.128 fgsch 1079: goto again;
1080: }
1.189 millert 1081: ac--, av++;
1.128 fgsch 1082: }
1083:
1.31 markus 1084: /* Check that we got a host name. */
1085: if (!host)
1086: usage();
1087:
1.583 dtucker 1088: options.host_arg = xstrdup(host);
1.385 djm 1089:
1.402 markus 1090: #ifdef WITH_OPENSSL
1.350 djm 1091: OpenSSL_add_all_algorithms();
1.72 markus 1092: ERR_load_crypto_strings();
1.402 markus 1093: #endif
1.31 markus 1094:
1095: /* Initialize the command to execute on remote host. */
1.482 markus 1096: if ((command = sshbuf_new()) == NULL)
1097: fatal("sshbuf_new failed");
1.1 deraadt 1098:
1.33 markus 1099: /*
1100: * Save the command to execute on the remote host in a buffer. There
1101: * is no limit on the length of the command, except by the maximum
1102: * packet size. Also sets the tty flag if there is no command.
1103: */
1.128 fgsch 1104: if (!ac) {
1.31 markus 1105: /* No command specified - execute shell on a tty. */
1.560 djm 1106: if (options.session_type == SESSION_TYPE_SUBSYSTEM) {
1.128 fgsch 1107: fprintf(stderr,
1108: "You must specify a subsystem to invoke.\n");
1.85 djm 1109: usage();
1110: }
1.31 markus 1111: } else {
1.128 fgsch 1112: /* A command has been specified. Store it into the buffer. */
1113: for (i = 0; i < ac; i++) {
1.482 markus 1114: if ((r = sshbuf_putf(command, "%s%s",
1115: i ? " " : "", av[i])) != 0)
1.540 djm 1116: fatal_fr(r, "buffer error");
1.31 markus 1117: }
1118: }
1119:
1.575 djm 1120: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1121:
1.101 markus 1122: /*
1123: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1124: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1125: */
1.375 dtucker 1126: if (use_syslog && logfile != NULL)
1127: fatal("Can't specify both -y and -E");
1.422 dtucker 1128: if (logfile != NULL)
1.375 dtucker 1129: log_redirect_stderr_to(logfile);
1.325 markus 1130: log_init(argv0,
1.468 djm 1131: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1132: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1133: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1134: SYSLOG_FACILITY_USER : options.log_facility,
1135: !use_syslog);
1.375 dtucker 1136:
1137: if (debug_flag)
1.541 dtucker 1138: logit("%s, %s", SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 1139:
1.400 djm 1140: /* Parse the configuration files */
1.583 dtucker 1141: process_config_files(options.host_arg, pw, 0, &want_final_pass);
1.496 djm 1142: if (want_final_pass)
1143: debug("configuration requests final Match pass");
1.400 djm 1144:
1145: /* Hostname canonicalisation needs a few options filled. */
1146: fill_default_options_for_canonicalization(&options);
1147:
1148: /* If the user has replaced the hostname then take it into use now */
1149: if (options.hostname != NULL) {
1150: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1151: cp = percent_expand(options.hostname,
1152: "h", host, (char *)NULL);
1153: free(host);
1154: host = cp;
1.408 djm 1155: free(options.hostname);
1156: options.hostname = xstrdup(host);
1.400 djm 1157: }
1158:
1.470 djm 1159: /* Don't lowercase addresses, they will be explicitly canonicalised */
1160: if ((was_addr = is_addr(host)) == 0)
1161: lowercase(host);
1162:
1163: /*
1164: * Try to canonicalize if requested by configuration or the
1165: * hostname is an address.
1166: */
1167: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1168: addrs = resolve_canonicalize(&host, options.port);
1169:
1.139 markus 1170: /*
1.401 djm 1171: * If CanonicalizePermittedCNAMEs have been specified but
1172: * other canonicalization did not happen (by not being requested
1173: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1174: * as a result of CNAME following.
1.401 djm 1175: *
1176: * Try to resolve the bare hostname name using the system resolver's
1177: * usual search rules and then apply the CNAME follow rules.
1178: *
1179: * Skip the lookup if a ProxyCommand is being used unless the user
1180: * has specifically requested canonicalisation for this case via
1181: * CanonicalizeHostname=always
1.139 markus 1182: */
1.443 djm 1183: direct = option_clear_or_none(options.proxy_command) &&
1.588 djm 1184: option_clear_or_none(options.jump_host);
1.568 djm 1185: if (addrs == NULL && config_has_permitted_cnames(&options) && (direct ||
1.443 djm 1186: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1187: if ((addrs = resolve_host(host, options.port,
1.493 djm 1188: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1189: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1190: if (direct)
1.403 djm 1191: cleanup_exit(255); /* logged in resolve_host */
1192: } else
1.443 djm 1193: check_follow_cname(direct, &host, cname);
1.400 djm 1194: }
1.139 markus 1195:
1.400 djm 1196: /*
1.408 djm 1197: * If canonicalisation is enabled then re-parse the configuration
1198: * files as new stanzas may match.
1.400 djm 1199: */
1.496 djm 1200: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1201: debug("hostname canonicalisation enabled, "
1202: "will re-parse configuration");
1203: want_final_pass = 1;
1204: }
1205:
1206: if (want_final_pass) {
1207: debug("re-parsing configuration");
1.408 djm 1208: free(options.hostname);
1209: options.hostname = xstrdup(host);
1.583 dtucker 1210: process_config_files(options.host_arg, pw, 1, NULL);
1.408 djm 1211: /*
1212: * Address resolution happens early with canonicalisation
1213: * enabled and the port number may have changed since, so
1214: * reset it in address list
1215: */
1216: if (addrs != NULL && options.port > 0)
1217: set_addrinfo_port(addrs, options.port);
1.139 markus 1218: }
1.31 markus 1219:
1220: /* Fill configuration defaults. */
1.543 djm 1221: if (fill_default_options(&options) != 0)
1222: cleanup_exit(255);
1.443 djm 1223:
1.534 dtucker 1224: if (options.user == NULL)
1225: options.user = xstrdup(pw->pw_name);
1226:
1.443 djm 1227: /*
1228: * If ProxyJump option specified, then construct a ProxyCommand now.
1229: */
1230: if (options.jump_host != NULL) {
1231: char port_s[8];
1.534 dtucker 1232: const char *jumpuser = options.jump_user, *sshbin = argv0;
1.520 dtucker 1233: int port = options.port, jumpport = options.jump_port;
1234:
1235: if (port <= 0)
1236: port = default_ssh_port();
1237: if (jumpport <= 0)
1238: jumpport = default_ssh_port();
1.534 dtucker 1239: if (jumpuser == NULL)
1240: jumpuser = options.user;
1241: if (strcmp(options.jump_host, host) == 0 && port == jumpport &&
1242: strcmp(options.user, jumpuser) == 0)
1.520 dtucker 1243: fatal("jumphost loop via %s", options.jump_host);
1.478 djm 1244:
1245: /*
1246: * Try to use SSH indicated by argv[0], but fall back to
1247: * "ssh" if it appears unavailable.
1248: */
1249: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1250: sshbin = "ssh";
1.443 djm 1251:
1252: /* Consistency check */
1253: if (options.proxy_command != NULL)
1254: fatal("inconsistent options: ProxyCommand+ProxyJump");
1255: /* Never use FD passing for ProxyJump */
1256: options.proxy_use_fdpass = 0;
1257: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1258: xasprintf(&options.proxy_command,
1.478 djm 1259: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1260: sshbin,
1.443 djm 1261: /* Optional "-l user" argument if jump_user set */
1262: options.jump_user == NULL ? "" : " -l ",
1263: options.jump_user == NULL ? "" : options.jump_user,
1264: /* Optional "-p port" argument if jump_port set */
1265: options.jump_port <= 0 ? "" : " -p ",
1266: options.jump_port <= 0 ? "" : port_s,
1267: /* Optional additional jump hosts ",..." */
1268: options.jump_extra == NULL ? "" : " -J ",
1269: options.jump_extra == NULL ? "" : options.jump_extra,
1.571 jsg 1270: /* Optional "-F" argument if -F specified */
1.443 djm 1271: config == NULL ? "" : " -F ",
1272: config == NULL ? "" : config,
1273: /* Optional "-v" arguments if -v set */
1274: debug_flag ? " -" : "",
1275: debug_flag, "vvv",
1276: /* Mandatory hostname */
1277: options.jump_host);
1278: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1279: options.proxy_command);
1280: }
1.31 markus 1281:
1.400 djm 1282: if (options.port == 0)
1283: options.port = default_ssh_port();
1.463 djm 1284: channel_set_af(ssh, options.address_family);
1.196 djm 1285:
1.383 djm 1286: /* Tidy and check options */
1287: if (options.host_key_alias != NULL)
1288: lowercase(options.host_key_alias);
1289: if (options.proxy_command != NULL &&
1290: strcmp(options.proxy_command, "-") == 0 &&
1291: options.proxy_use_fdpass)
1292: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.516 markus 1293: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1294: if (options.control_persist && options.control_path != NULL) {
1295: debug("UpdateHostKeys=ask is incompatible with "
1296: "ControlPersist; disabling");
1297: options.update_hostkeys = 0;
1298: } else if (sshbuf_len(command) != 0 ||
1299: options.remote_command != NULL ||
1300: options.request_tty == REQUEST_TTY_NO) {
1301: debug("UpdateHostKeys=ask is incompatible with "
1302: "remote command execution; disabling");
1.517 djm 1303: options.update_hostkeys = 0;
1304: } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1305: /* no point logging anything; user won't see it */
1.516 markus 1306: options.update_hostkeys = 0;
1307: }
1.415 djm 1308: }
1.430 djm 1309: if (options.connection_attempts <= 0)
1310: fatal("Invalid number of ConnectionAttempts");
1311:
1.482 markus 1312: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1313: fatal("Cannot execute command-line and remote command.");
1314:
1315: /* Cannot fork to background if no command. */
1.564 djm 1316: if (options.fork_after_authentication && sshbuf_len(command) == 0 &&
1.562 djm 1317: options.remote_command == NULL &&
1318: options.session_type != SESSION_TYPE_NONE)
1.461 bluhm 1319: fatal("Cannot fork into background without a command "
1320: "to execute.");
1321:
1.31 markus 1322: /* reinit */
1.452 dtucker 1323: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.559 djm 1324: for (j = 0; j < options.num_log_verbose; j++) {
1325: if (strcasecmp(options.log_verbose[j], "none") == 0)
1326: break;
1.539 djm 1327: log_verbose_add(options.log_verbose[j]);
1.559 djm 1328: }
1.370 djm 1329:
1330: if (options.request_tty == REQUEST_TTY_YES ||
1331: options.request_tty == REQUEST_TTY_FORCE)
1332: tty_flag = 1;
1333:
1334: /* Allocate a tty by default if no command specified. */
1.482 markus 1335: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1336: tty_flag = options.request_tty != REQUEST_TTY_NO;
1337:
1338: /* Force no tty */
1.447 markus 1339: if (options.request_tty == REQUEST_TTY_NO ||
1.570 djm 1340: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY) ||
1341: options.session_type == SESSION_TYPE_NONE)
1.370 djm 1342: tty_flag = 0;
1343: /* Do not allocate a tty if stdin is not a tty. */
1.563 djm 1344: if ((!isatty(fileno(stdin)) || options.stdin_null) &&
1.370 djm 1345: options.request_tty != REQUEST_TTY_FORCE) {
1346: if (tty_flag)
1347: logit("Pseudo-terminal will not be allocated because "
1348: "stdin is not a terminal.");
1349: tty_flag = 0;
1350: }
1.343 djm 1351:
1.466 djm 1352: /* Set up strings used to percent_expand() arguments */
1.544 djm 1353: cinfo = xcalloc(1, sizeof(*cinfo));
1.358 djm 1354: if (gethostname(thishost, sizeof(thishost)) == -1)
1355: fatal("gethostname: %s", strerror(errno));
1.544 djm 1356: cinfo->thishost = xstrdup(thishost);
1357: thishost[strcspn(thishost, ".")] = '\0';
1358: cinfo->shorthost = xstrdup(thishost);
1359: xasprintf(&cinfo->portstr, "%d", options.port);
1360: xasprintf(&cinfo->uidstr, "%llu",
1.479 djm 1361: (unsigned long long)pw->pw_uid);
1.544 djm 1362: cinfo->keyalias = xstrdup(options.host_key_alias ?
1.583 dtucker 1363: options.host_key_alias : options.host_arg);
1.544 djm 1364: cinfo->conn_hash_hex = ssh_connection_hash(cinfo->thishost, host,
1365: cinfo->portstr, options.user);
1.583 dtucker 1366: cinfo->host_arg = xstrdup(options.host_arg);
1.544 djm 1367: cinfo->remhost = xstrdup(host);
1368: cinfo->remuser = xstrdup(options.user);
1369: cinfo->homedir = xstrdup(pw->pw_dir);
1370: cinfo->locuser = xstrdup(pw->pw_name);
1.405 djm 1371:
1.466 djm 1372: /*
1373: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1374: * after port-forwarding is set up, so it may pick up any local
1375: * tunnel interface name allocated.
1376: */
1.461 bluhm 1377: if (options.remote_command != NULL) {
1378: debug3("expanding RemoteCommand: %s", options.remote_command);
1379: cp = options.remote_command;
1.527 dtucker 1380: options.remote_command = default_client_percent_expand(cp,
1.544 djm 1381: cinfo);
1.461 bluhm 1382: debug3("expanded RemoteCommand: %s", options.remote_command);
1383: free(cp);
1.482 markus 1384: if ((r = sshbuf_put(command, options.remote_command,
1385: strlen(options.remote_command))) != 0)
1.540 djm 1386: fatal_fr(r, "buffer error");
1.304 dtucker 1387: }
1.31 markus 1388:
1.214 djm 1389: if (options.control_path != NULL) {
1.490 dtucker 1390: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1391: free(options.control_path);
1.528 dtucker 1392: options.control_path = default_client_percent_dollar_expand(cp,
1.544 djm 1393: cinfo);
1.378 djm 1394: free(cp);
1.214 djm 1395: }
1.408 djm 1396:
1.522 dtucker 1397: if (options.identity_agent != NULL) {
1398: p = tilde_expand_filename(options.identity_agent, getuid());
1.544 djm 1399: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1400: free(p);
1401: free(options.identity_agent);
1402: options.identity_agent = cp;
1.586 dtucker 1403: }
1404:
1405: if (options.revoked_host_keys != NULL) {
1406: p = tilde_expand_filename(options.revoked_host_keys, getuid());
1407: cp = default_client_percent_dollar_expand(p, cinfo);
1408: free(p);
1409: free(options.revoked_host_keys);
1410: options.revoked_host_keys = cp;
1.522 dtucker 1411: }
1412:
1413: if (options.forward_agent_sock_path != NULL) {
1414: p = tilde_expand_filename(options.forward_agent_sock_path,
1415: getuid());
1.544 djm 1416: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1417: free(p);
1418: free(options.forward_agent_sock_path);
1419: options.forward_agent_sock_path = cp;
1.552 djm 1420: if (stat(options.forward_agent_sock_path, &st) != 0) {
1421: error("Cannot forward agent socket path \"%s\": %s",
1422: options.forward_agent_sock_path, strerror(errno));
1423: if (options.exit_on_forward_failure)
1424: cleanup_exit(255);
1425: }
1.532 dtucker 1426: }
1427:
1.545 djm 1428: if (options.num_system_hostfiles > 0 &&
1429: strcasecmp(options.system_hostfiles[0], "none") == 0) {
1430: if (options.num_system_hostfiles > 1)
1431: fatal("Invalid GlobalKnownHostsFiles: \"none\" "
1432: "appears with other entries");
1433: free(options.system_hostfiles[0]);
1434: options.system_hostfiles[0] = NULL;
1435: options.num_system_hostfiles = 0;
1436: }
1437:
1438: if (options.num_user_hostfiles > 0 &&
1439: strcasecmp(options.user_hostfiles[0], "none") == 0) {
1440: if (options.num_user_hostfiles > 1)
1441: fatal("Invalid UserKnownHostsFiles: \"none\" "
1442: "appears with other entries");
1443: free(options.user_hostfiles[0]);
1444: options.user_hostfiles[0] = NULL;
1445: options.num_user_hostfiles = 0;
1446: }
1.532 dtucker 1447: for (j = 0; j < options.num_user_hostfiles; j++) {
1.545 djm 1448: if (options.user_hostfiles[j] == NULL)
1449: continue;
1450: cp = tilde_expand_filename(options.user_hostfiles[j], getuid());
1451: p = default_client_percent_dollar_expand(cp, cinfo);
1452: if (strcmp(options.user_hostfiles[j], p) != 0)
1453: debug3("expanded UserKnownHostsFile '%s' -> "
1454: "'%s'", options.user_hostfiles[j], p);
1455: free(options.user_hostfiles[j]);
1456: free(cp);
1457: options.user_hostfiles[j] = p;
1.522 dtucker 1458: }
1459:
1.527 dtucker 1460: for (i = 0; i < options.num_local_forwards; i++) {
1461: if (options.local_forwards[i].listen_path != NULL) {
1462: cp = options.local_forwards[i].listen_path;
1463: p = options.local_forwards[i].listen_path =
1.544 djm 1464: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1465: if (strcmp(cp, p) != 0)
1466: debug3("expanded LocalForward listen path "
1467: "'%s' -> '%s'", cp, p);
1468: free(cp);
1469: }
1470: if (options.local_forwards[i].connect_path != NULL) {
1471: cp = options.local_forwards[i].connect_path;
1472: p = options.local_forwards[i].connect_path =
1.544 djm 1473: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1474: if (strcmp(cp, p) != 0)
1475: debug3("expanded LocalForward connect path "
1476: "'%s' -> '%s'", cp, p);
1477: free(cp);
1478: }
1479: }
1480:
1481: for (i = 0; i < options.num_remote_forwards; i++) {
1482: if (options.remote_forwards[i].listen_path != NULL) {
1483: cp = options.remote_forwards[i].listen_path;
1484: p = options.remote_forwards[i].listen_path =
1.544 djm 1485: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1486: if (strcmp(cp, p) != 0)
1487: debug3("expanded RemoteForward listen path "
1488: "'%s' -> '%s'", cp, p);
1489: free(cp);
1490: }
1491: if (options.remote_forwards[i].connect_path != NULL) {
1492: cp = options.remote_forwards[i].connect_path;
1493: p = options.remote_forwards[i].connect_path =
1.544 djm 1494: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1495: if (strcmp(cp, p) != 0)
1496: debug3("expanded RemoteForward connect path "
1497: "'%s' -> '%s'", cp, p);
1498: free(cp);
1499: }
1500: }
1501:
1.408 djm 1502: if (config_test) {
1503: dump_client_config(&options, host);
1504: exit(0);
1.508 djm 1505: }
1506:
1507: /* Expand SecurityKeyProvider if it refers to an environment variable */
1508: if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1509: strlen(options.sk_provider) > 1) {
1510: if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1.518 naddy 1511: debug("Authenticator provider %s did not resolve; "
1.508 djm 1512: "disabling", options.sk_provider);
1513: free(options.sk_provider);
1514: options.sk_provider = NULL;
1515: } else {
1516: debug2("resolved SecurityKeyProvider %s => %s",
1517: options.sk_provider, cp);
1518: free(options.sk_provider);
1519: options.sk_provider = xstrdup(cp);
1520: }
1.408 djm 1521: }
1.405 djm 1522:
1.312 djm 1523: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1524: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1525: if (options.control_path != NULL) {
1526: int sock;
1527: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1528: ssh_packet_set_connection(ssh, sock, sock);
1.499 djm 1529: ssh_packet_set_mux(ssh);
1.447 markus 1530: goto skip_connect;
1531: }
1532: }
1.401 djm 1533:
1534: /*
1535: * If hostname canonicalisation was not enabled, then we may not
1536: * have yet resolved the hostname. Do so now.
1537: */
1538: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1539: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1540: if ((addrs = resolve_host(host, options.port, 1,
1541: cname, sizeof(cname))) == NULL)
1542: cleanup_exit(255); /* resolve_host logs the error */
1543: }
1.214 djm 1544:
1.542 dtucker 1545: if (options.connection_timeout >= INT_MAX/1000)
1546: timeout_ms = INT_MAX;
1547: else
1548: timeout_ms = options.connection_timeout * 1000;
1.303 djm 1549:
1.77 markus 1550: /* Open a connection to the remote host. */
1.583 dtucker 1551: if (ssh_connect(ssh, host, options.host_arg, addrs, &hostaddr,
1552: options.port, options.connection_attempts,
1.488 dtucker 1553: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1554: exit(255);
1.31 markus 1555:
1.391 djm 1556: if (addrs != NULL)
1557: freeaddrinfo(addrs);
1558:
1.499 djm 1559: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1560: options.server_alive_count_max);
1561:
1.303 djm 1562: if (timeout_ms > 0)
1563: debug3("timeout: %d ms remain after connect", timeout_ms);
1564:
1.33 markus 1565: /*
1.485 dtucker 1566: * If we successfully made the connection and we have hostbased auth
1567: * enabled, load the public keys so we can later use the ssh-keysign
1568: * helper to sign challenges.
1.33 markus 1569: */
1.112 markus 1570: sensitive_data.nkeys = 0;
1571: sensitive_data.keys = NULL;
1.457 djm 1572: if (options.hostbased_authentication) {
1.581 dtucker 1573: int loaded = 0;
1574:
1.486 dtucker 1575: sensitive_data.nkeys = 10;
1.274 deraadt 1576: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.578 jsg 1577: sizeof(*sensitive_data.keys));
1.483 markus 1578:
1579: /* XXX check errors? */
1.486 dtucker 1580: #define L_PUBKEY(p,o) do { \
1581: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1582: fatal_f("pubkey out of array bounds"); \
1.483 markus 1583: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.576 djm 1584: &(sensitive_data.keys[o]), p, "pubkey"); \
1.581 dtucker 1585: if (sensitive_data.keys[o] != NULL) { \
1.572 djm 1586: debug2("hostbased key %d: %s key from \"%s\"", o, \
1587: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.581 dtucker 1588: loaded++; \
1589: } \
1.486 dtucker 1590: } while (0)
1591: #define L_CERT(p,o) do { \
1592: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1593: fatal_f("cert out of array bounds"); \
1.576 djm 1594: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), \
1595: &(sensitive_data.keys[o]), p, "cert"); \
1.581 dtucker 1596: if (sensitive_data.keys[o] != NULL) { \
1.572 djm 1597: debug2("hostbased key %d: %s cert from \"%s\"", o, \
1598: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.581 dtucker 1599: loaded++; \
1600: } \
1.486 dtucker 1601: } while (0)
1.177 markus 1602:
1.485 dtucker 1603: if (options.hostbased_authentication == 1) {
1.486 dtucker 1604: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1605: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1606: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1607: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1608: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1609: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1610: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1611: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1612: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1613: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.581 dtucker 1614: if (loaded == 0)
1615: debug("HostbasedAuthentication enabled but no "
1616: "local public host keys could be loaded.");
1.173 markus 1617: }
1.367 djm 1618: }
1.31 markus 1619:
1.104 markus 1620: /* load options.identity_files */
1.544 djm 1621: load_public_identity_files(cinfo);
1.439 markus 1622:
1.476 djm 1623: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1624: if (options.identity_agent &&
1625: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1626: if (strcmp(options.identity_agent, "none") == 0) {
1627: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1628: } else {
1.522 dtucker 1629: cp = options.identity_agent;
1.528 dtucker 1630: /* legacy (limited) format */
1631: if (cp[0] == '$' && cp[1] != '{') {
1.494 djm 1632: if (!valid_env_name(cp + 1)) {
1633: fatal("Invalid IdentityAgent "
1634: "environment variable name %s", cp);
1635: }
1636: if ((p = getenv(cp + 1)) == NULL)
1637: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1638: else
1639: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1640: } else {
1641: /* identity_agent specifies a path directly */
1642: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1643: }
1.510 djm 1644: }
1645: }
1646:
1.522 dtucker 1647: if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1.526 djm 1648: cp = options.forward_agent_sock_path;
1.510 djm 1649: if (cp[0] == '$') {
1650: if (!valid_env_name(cp + 1)) {
1651: fatal("Invalid ForwardAgent environment variable name %s", cp);
1652: }
1653: if ((p = getenv(cp + 1)) != NULL)
1.566 dtucker 1654: forward_agent_sock_path = xstrdup(p);
1.510 djm 1655: else
1656: options.forward_agent = 0;
1657: free(cp);
1658: } else {
1659: forward_agent_sock_path = cp;
1.439 markus 1660: }
1661: }
1.104 markus 1662:
1663: /* Expand ~ in known host file names. */
1.361 djm 1664: tilde_expand_paths(options.system_hostfiles,
1665: options.num_system_hostfiles);
1666: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1667:
1.512 dtucker 1668: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1669:
1.316 djm 1670: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1671: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.546 djm 1672: options.port, pw, timeout_ms, cinfo);
1.31 markus 1673:
1.112 markus 1674: /* We no longer need the private host keys. Clear them now. */
1675: if (sensitive_data.nkeys != 0) {
1676: for (i = 0; i < sensitive_data.nkeys; i++) {
1677: if (sensitive_data.keys[i] != NULL) {
1678: /* Destroys contents safely */
1679: debug3("clear hostkey %d", i);
1.483 markus 1680: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1681: sensitive_data.keys[i] = NULL;
1682: }
1683: }
1.378 djm 1684: free(sensitive_data.keys);
1.134 markus 1685: }
1686: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1687: free(options.identity_files[i]);
1688: options.identity_files[i] = NULL;
1.134 markus 1689: if (options.identity_keys[i]) {
1.483 markus 1690: sshkey_free(options.identity_keys[i]);
1.134 markus 1691: options.identity_keys[i] = NULL;
1692: }
1.112 markus 1693: }
1.426 djm 1694: for (i = 0; i < options.num_certificate_files; i++) {
1695: free(options.certificate_files[i]);
1696: options.certificate_files[i] = NULL;
1697: }
1.553 djm 1698:
1699: #ifdef ENABLE_PKCS11
1700: (void)pkcs11_del_provider(options.pkcs11_provider);
1701: #endif
1.31 markus 1702:
1.447 markus 1703: skip_connect:
1.544 djm 1704: exit_status = ssh_session2(ssh, cinfo);
1705: ssh_conn_info_free(cinfo);
1.499 djm 1706: ssh_packet_close(ssh);
1.186 djm 1707:
1.312 djm 1708: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1709: unlink(options.control_path);
1710:
1.353 djm 1711: /* Kill ProxyCommand if it is running. */
1712: ssh_kill_proxy_command();
1.186 djm 1713:
1.45 markus 1714: return exit_status;
1715: }
1716:
1.344 djm 1717: static void
1718: control_persist_detach(void)
1719: {
1720: pid_t pid;
1721:
1.540 djm 1722: debug_f("backgrounding master process");
1.344 djm 1723:
1.473 djm 1724: /*
1725: * master (current process) into the background, and make the
1726: * foreground process a client of the backgrounded master.
1727: */
1.344 djm 1728: switch ((pid = fork())) {
1729: case -1:
1.540 djm 1730: fatal_f("fork: %s", strerror(errno));
1.344 djm 1731: case 0:
1732: /* Child: master process continues mainloop */
1.473 djm 1733: break;
1734: default:
1.531 djm 1735: /* Parent: set up mux client to connect to backgrounded master */
1.540 djm 1736: debug2_f("background process is %ld", (long)pid);
1.563 djm 1737: options.stdin_null = ostdin_null_flag;
1.359 djm 1738: options.request_tty = orequest_tty;
1.344 djm 1739: tty_flag = otty_flag;
1.561 djm 1740: options.session_type = osession_type;
1.473 djm 1741: close(muxserver_sock);
1742: muxserver_sock = -1;
1.351 markus 1743: options.control_master = SSHCTL_MASTER_NO;
1.587 dtucker 1744: (void)muxclient(options.control_path);
1.344 djm 1745: /* muxclient() doesn't return on success. */
1.473 djm 1746: fatal("Failed to connect to new control master");
1747: }
1.537 djm 1748: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1749: error_f("stdfd_devnull failed");
1.381 djm 1750: daemon(1, 1);
1.362 djm 1751: setproctitle("%s [mux]", options.control_path);
1.344 djm 1752: }
1753:
1754: /* Do fork() after authentication. Used by "ssh -f" */
1755: static void
1756: fork_postauth(void)
1757: {
1758: if (need_controlpersist_detach)
1759: control_persist_detach();
1760: debug("forking to background");
1.564 djm 1761: options.fork_after_authentication = 0;
1.505 deraadt 1762: if (daemon(1, 1) == -1)
1.344 djm 1763: fatal("daemon() failed: %.200s", strerror(errno));
1.537 djm 1764: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1765: error_f("stdfd_devnull failed");
1.344 djm 1766: }
1767:
1.523 djm 1768: static void
1769: forwarding_success(void)
1770: {
1.524 djm 1771: if (forward_confirms_pending == -1)
1772: return;
1773: if (--forward_confirms_pending == 0) {
1.540 djm 1774: debug_f("all expected forwarding replies received");
1.564 djm 1775: if (options.fork_after_authentication)
1.523 djm 1776: fork_postauth();
1.524 djm 1777: } else {
1.540 djm 1778: debug2_f("%d expected forwarding replies remaining",
1779: forward_confirms_pending);
1.523 djm 1780: }
1781: }
1782:
1.315 djm 1783: /* Callback for remote forward global requests */
1784: static void
1.463 djm 1785: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1786: {
1.406 millert 1787: struct Forward *rfwd = (struct Forward *)ctxt;
1.499 djm 1788: u_int port;
1789: int r;
1.315 djm 1790:
1.324 djm 1791: /* XXX verbose() on failure? */
1.404 markus 1792: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1793: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1794: rfwd->listen_path ? rfwd->listen_path :
1795: rfwd->listen_host ? rfwd->listen_host : "",
1796: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1797: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1798: rfwd->connect_host, rfwd->connect_port);
1799: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1800: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1.499 djm 1801: if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1.540 djm 1802: fatal_fr(r, "parse packet");
1.499 djm 1803: if (port > 65535) {
1804: error("Invalid allocated port %u for remote "
1805: "forward to %s:%d", port,
1806: rfwd->connect_host, rfwd->connect_port);
1807: /* Ensure failure processing runs below */
1808: type = SSH2_MSG_REQUEST_FAILURE;
1809: channel_update_permission(ssh,
1810: rfwd->handle, -1);
1811: } else {
1812: rfwd->allocated_port = (int)port;
1813: logit("Allocated port %u for remote "
1814: "forward to %s:%d",
1.569 dtucker 1815: rfwd->allocated_port, rfwd->connect_path ?
1816: rfwd->connect_path : rfwd->connect_host,
1.499 djm 1817: rfwd->connect_port);
1818: channel_update_permission(ssh,
1819: rfwd->handle, rfwd->allocated_port);
1820: }
1.366 markus 1821: } else {
1.480 djm 1822: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1823: }
1.324 djm 1824: }
1.468 djm 1825:
1.315 djm 1826: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1827: if (options.exit_on_forward_failure) {
1828: if (rfwd->listen_path != NULL)
1829: fatal("Error: remote port forwarding failed "
1830: "for listen path %s", rfwd->listen_path);
1831: else
1832: fatal("Error: remote port forwarding failed "
1833: "for listen port %d", rfwd->listen_port);
1834: } else {
1835: if (rfwd->listen_path != NULL)
1836: logit("Warning: remote port forwarding failed "
1837: "for listen path %s", rfwd->listen_path);
1838: else
1839: logit("Warning: remote port forwarding failed "
1840: "for listen port %d", rfwd->listen_port);
1841: }
1.315 djm 1842: }
1.523 djm 1843: forwarding_success();
1.315 djm 1844: }
1845:
1.126 itojun 1846: static void
1.582 djm 1847: client_cleanup_stdio_fwd(struct ssh *ssh, int id, int force, void *arg)
1.331 dtucker 1848: {
1849: debug("stdio forwarding: done");
1850: cleanup_exit(0);
1851: }
1852:
1.368 djm 1853: static void
1.463 djm 1854: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1855: {
1856: if (!success)
1857: fatal("stdio forwarding failed");
1858: }
1859:
1860: static void
1.523 djm 1861: ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
1862: {
1863: if (!success) {
1864: error("Tunnel forwarding failed");
1865: if (options.exit_on_forward_failure)
1866: cleanup_exit(255);
1867: }
1868:
1.540 djm 1869: debug_f("tunnel forward established, id=%d", id);
1.523 djm 1870: forwarding_success();
1871: }
1872:
1873: static void
1.463 djm 1874: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1875: {
1876: Channel *c;
1.332 djm 1877: int in, out;
1.331 dtucker 1878:
1.441 dtucker 1879: if (options.stdio_forward_host == NULL)
1.368 djm 1880: return;
1881:
1.540 djm 1882: debug3_f("%s:%d", options.stdio_forward_host,
1.441 dtucker 1883: options.stdio_forward_port);
1.332 djm 1884:
1.505 deraadt 1885: if ((in = dup(STDIN_FILENO)) == -1 ||
1886: (out = dup(STDOUT_FILENO)) == -1)
1.557 djm 1887: fatal_f("dup() in/out failed");
1.463 djm 1888: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.557 djm 1889: options.stdio_forward_port, in, out,
1890: CHANNEL_NONBLOCK_STDIO)) == NULL)
1.540 djm 1891: fatal_f("channel_connect_stdio_fwd failed");
1.463 djm 1892: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1893: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1894: }
1895:
1896: static void
1.551 markus 1897: ssh_init_forward_permissions(struct ssh *ssh, const char *what, char **opens,
1898: u_int num_opens)
1899: {
1900: u_int i;
1901: int port;
1.573 dtucker 1902: char *addr, *arg, *oarg;
1.551 markus 1903: int where = FORWARD_LOCAL;
1904:
1905: channel_clear_permission(ssh, FORWARD_ADM, where);
1906: if (num_opens == 0)
1907: return; /* permit any */
1908:
1909: /* handle keywords: "any" / "none" */
1910: if (num_opens == 1 && strcmp(opens[0], "any") == 0)
1911: return;
1912: if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
1913: channel_disable_admin(ssh, where);
1914: return;
1915: }
1916: /* Otherwise treat it as a list of permitted host:port */
1917: for (i = 0; i < num_opens; i++) {
1918: oarg = arg = xstrdup(opens[i]);
1.573 dtucker 1919: addr = hpdelim(&arg);
1920: if (addr == NULL)
1.551 markus 1921: fatal_f("missing host in %s", what);
1922: addr = cleanhostname(addr);
1923: if (arg == NULL || ((port = permitopen_port(arg)) < 0))
1924: fatal_f("bad port number in %s", what);
1925: /* Send it to channels layer */
1926: channel_add_permission(ssh, FORWARD_ADM,
1927: where, addr, port);
1928: free(oarg);
1929: }
1930: }
1931:
1932: static void
1.466 djm 1933: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1934: {
1.86 markus 1935: int success = 0;
1.70 markus 1936: int i;
1.551 markus 1937:
1938: ssh_init_forward_permissions(ssh, "permitremoteopen",
1939: options.permitted_remote_opens,
1940: options.num_permitted_remote_opens);
1.331 dtucker 1941:
1.524 djm 1942: if (options.exit_on_forward_failure)
1943: forward_confirms_pending = 0; /* track pending requests */
1.70 markus 1944: /* Initiate local TCP/IP port forwardings. */
1945: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1946: debug("Local connections to %.200s:%d forwarded to remote "
1947: "address %.200s:%d",
1.406 millert 1948: (options.local_forwards[i].listen_path != NULL) ?
1949: options.local_forwards[i].listen_path :
1.234 deraadt 1950: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1951: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1952: options.local_forwards[i].listen_host,
1953: options.local_forwards[i].listen_port,
1.406 millert 1954: (options.local_forwards[i].connect_path != NULL) ?
1955: options.local_forwards[i].connect_path :
1.232 djm 1956: options.local_forwards[i].connect_host,
1957: options.local_forwards[i].connect_port);
1.463 djm 1958: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1959: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1960: }
1.283 markus 1961: if (i > 0 && success != i && options.exit_on_forward_failure)
1962: fatal("Could not request local forwarding.");
1.86 markus 1963: if (i > 0 && success == 0)
1964: error("Could not request local forwarding.");
1.70 markus 1965:
1966: /* Initiate remote TCP/IP port forwardings. */
1967: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1968: debug("Remote connections from %.200s:%d forwarded to "
1969: "local address %.200s:%d",
1.406 millert 1970: (options.remote_forwards[i].listen_path != NULL) ?
1971: options.remote_forwards[i].listen_path :
1.248 djm 1972: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1973: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1974: options.remote_forwards[i].listen_port,
1.406 millert 1975: (options.remote_forwards[i].connect_path != NULL) ?
1976: options.remote_forwards[i].connect_path :
1.232 djm 1977: options.remote_forwards[i].connect_host,
1978: options.remote_forwards[i].connect_port);
1.523 djm 1979: if ((options.remote_forwards[i].handle =
1.463 djm 1980: channel_request_remote_forwarding(ssh,
1.523 djm 1981: &options.remote_forwards[i])) >= 0) {
1.463 djm 1982: client_register_global_confirm(
1983: ssh_confirm_remote_forward,
1.366 markus 1984: &options.remote_forwards[i]);
1.523 djm 1985: forward_confirms_pending++;
1986: } else if (options.exit_on_forward_failure)
1987: fatal("Could not request remote forwarding.");
1988: else
1989: logit("Warning: Could not request remote forwarding.");
1.70 markus 1990: }
1.301 djm 1991:
1992: /* Initiate tunnel forwarding. */
1993: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1994: if ((*ifname = client_request_tun_fwd(ssh,
1995: options.tun_open, options.tun_local,
1.523 djm 1996: options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
1997: forward_confirms_pending++;
1998: else if (options.exit_on_forward_failure)
1999: fatal("Could not request tunnel forwarding.");
2000: else
2001: error("Could not request tunnel forwarding.");
1.524 djm 2002: }
2003: if (forward_confirms_pending > 0) {
1.540 djm 2004: debug_f("expecting replies for %d forwards",
1.524 djm 2005: forward_confirms_pending);
1.468 djm 2006: }
1.70 markus 2007: }
2008:
1.126 itojun 2009: static void
1.70 markus 2010: check_agent_present(void)
2011: {
1.412 djm 2012: int r;
2013:
1.70 markus 2014: if (options.forward_agent) {
1.254 djm 2015: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 2016: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 2017: options.forward_agent = 0;
1.412 djm 2018: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.540 djm 2019: debug_r(r, "ssh_get_authentication_socket");
1.412 djm 2020: }
1.70 markus 2021: }
2022: }
2023:
1.214 djm 2024: static void
1.463 djm 2025: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 2026: {
1.215 djm 2027: extern char **environ;
1.558 djm 2028: const char *display, *term;
1.499 djm 2029: int r, interactive = tty_flag;
1.433 djm 2030: char *proto = NULL, *data = NULL;
1.337 djm 2031:
2032: if (!success)
1.580 djm 2033: return; /* No need for error message, channels code sends one */
1.215 djm 2034:
1.248 djm 2035: display = getenv("DISPLAY");
1.417 djm 2036: if (display == NULL && options.forward_x11)
2037: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 2038: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 2039: options.xauth_location, options.forward_x11_trusted,
2040: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 2041: /* Request forwarding with authentication spoofing. */
1.316 djm 2042: debug("Requesting X11 forwarding with authentication "
2043: "spoofing.");
1.463 djm 2044: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 2045: data, 1);
1.463 djm 2046: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 2047: /* XXX exit_on_forward_failure */
1.80 markus 2048: interactive = 1;
1.50 markus 2049: }
2050:
1.70 markus 2051: check_agent_present();
2052: if (options.forward_agent) {
2053: debug("Requesting authentication agent forwarding.");
1.463 djm 2054: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 2055: if ((r = sshpkt_send(ssh)) != 0)
1.540 djm 2056: fatal_fr(r, "send packet");
1.212 djm 2057: }
1.369 dtucker 2058:
2059: /* Tell the packet module whether this is an interactive session. */
1.499 djm 2060: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 2061: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 2062:
1.558 djm 2063: if ((term = lookup_env_in_list("TERM", options.setenv,
2064: options.num_setenv)) == NULL || *term == '\0')
2065: term = getenv("TERM");
1.562 djm 2066: client_session2_setup(ssh, id, tty_flag,
2067: options.session_type == SESSION_TYPE_SUBSYSTEM, term,
1.482 markus 2068: NULL, fileno(stdin), command, environ);
1.45 markus 2069: }
2070:
1.143 markus 2071: /* open new channel for a session */
1.126 itojun 2072: static int
1.463 djm 2073: ssh_session2_open(struct ssh *ssh)
1.45 markus 2074: {
1.118 markus 2075: Channel *c;
2076: int window, packetmax, in, out, err;
1.60 markus 2077:
1.563 djm 2078: if (options.stdin_null) {
1.93 itojun 2079: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 2080: } else {
2081: in = dup(STDIN_FILENO);
2082: }
1.60 markus 2083: out = dup(STDOUT_FILENO);
2084: err = dup(STDERR_FILENO);
1.45 markus 2085:
1.505 deraadt 2086: if (in == -1 || out == -1 || err == -1)
1.62 markus 2087: fatal("dup() in/out/err failed");
1.45 markus 2088:
1.65 markus 2089: window = CHAN_SES_WINDOW_DEFAULT;
2090: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 2091: if (tty_flag) {
2092: window >>= 1;
2093: packetmax >>= 1;
1.45 markus 2094: }
1.463 djm 2095: c = channel_new(ssh,
1.45 markus 2096: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 2097: window, packetmax, CHAN_EXTENDED_WRITE,
1.557 djm 2098: "client-session", CHANNEL_NONBLOCK_STDIO);
1.45 markus 2099:
1.540 djm 2100: debug3_f("channel_new: %d", c->self);
1.106 markus 2101:
1.463 djm 2102: channel_send_open(ssh, c->self);
1.560 djm 2103: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2104: channel_register_open_confirm(ssh, c->self,
1.310 djm 2105: ssh_session2_setup, NULL);
1.106 markus 2106:
1.118 markus 2107: return c->self;
1.106 markus 2108: }
2109:
1.126 itojun 2110: static int
1.544 djm 2111: ssh_session2(struct ssh *ssh, const struct ssh_conn_info *cinfo)
1.106 markus 2112: {
1.537 djm 2113: int r, id = -1;
1.466 djm 2114: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 2115:
2116: /* XXX should be pre-session */
1.368 djm 2117: if (!options.control_persist)
1.463 djm 2118: ssh_init_stdio_forwarding(ssh);
1.466 djm 2119:
2120: ssh_init_forwarding(ssh, &tun_fwd_ifname);
2121:
2122: if (options.local_command != NULL) {
2123: debug3("expanding LocalCommand: %s", options.local_command);
2124: cp = options.local_command;
2125: options.local_command = percent_expand(cp,
1.546 djm 2126: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.466 djm 2127: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2128: (char *)NULL);
2129: debug3("expanded LocalCommand: %s", options.local_command);
2130: free(cp);
2131: }
1.106 markus 2132:
1.344 djm 2133: /* Start listening for multiplex clients */
1.499 djm 2134: if (!ssh_packet_get_mux(ssh))
1.463 djm 2135: muxserver_listen(ssh);
1.344 djm 2136:
1.473 djm 2137: /*
1.368 djm 2138: * If we are in control persist mode and have a working mux listen
2139: * socket, then prepare to background ourselves and have a foreground
1.531 djm 2140: * client attach as a control client.
1.368 djm 2141: * NB. we must save copies of the flags that we override for
1.531 djm 2142: * the backgrounding, since we defer attachment of the client until
1.344 djm 2143: * after the connection is fully established (in particular,
2144: * async rfwd replies have been received for ExitOnForwardFailure).
2145: */
1.473 djm 2146: if (options.control_persist && muxserver_sock != -1) {
1.563 djm 2147: ostdin_null_flag = options.stdin_null;
1.560 djm 2148: osession_type = options.session_type;
1.359 djm 2149: orequest_tty = options.request_tty;
1.344 djm 2150: otty_flag = tty_flag;
1.563 djm 2151: options.stdin_null = 1;
1.560 djm 2152: options.session_type = SESSION_TYPE_NONE;
1.473 djm 2153: tty_flag = 0;
1.564 djm 2154: if (!options.fork_after_authentication &&
1.562 djm 2155: (osession_type != SESSION_TYPE_NONE ||
2156: options.stdio_forward_host != NULL))
1.344 djm 2157: need_controlpersist_detach = 1;
1.564 djm 2158: options.fork_after_authentication = 1;
1.473 djm 2159: }
1.368 djm 2160: /*
2161: * ControlPersist mux listen socket setup failed, attempt the
2162: * stdio forward setup that we skipped earlier.
2163: */
2164: if (options.control_persist && muxserver_sock == -1)
1.463 djm 2165: ssh_init_stdio_forwarding(ssh);
1.344 djm 2166:
1.560 djm 2167: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2168: id = ssh_session2_open(ssh);
1.379 djm 2169: else {
1.499 djm 2170: ssh_packet_set_interactive(ssh,
1.379 djm 2171: options.control_master == SSHCTL_MASTER_NO,
2172: options.ip_qos_interactive, options.ip_qos_bulk);
2173: }
1.314 djm 2174:
2175: /* If we don't expect to open a new session, then disallow it */
1.319 markus 2176: if (options.control_master == SSHCTL_MASTER_NO &&
1.549 djm 2177: (ssh->compat & SSH_NEW_OPENSSH)) {
1.314 djm 2178: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 2179: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2180: (r = sshpkt_put_cstring(ssh,
2181: "no-more-sessions@openssh.com")) != 0 ||
2182: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2183: (r = sshpkt_send(ssh)) != 0)
1.540 djm 2184: fatal_fr(r, "send packet");
1.314 djm 2185: }
1.255 reyk 2186:
2187: /* Execute a local command */
2188: if (options.local_command != NULL &&
2189: options.permit_local_command)
2190: ssh_local_cmd(options.local_command);
1.467 djm 2191:
2192: /*
2193: * stdout is now owned by the session channel; clobber it here
2194: * so future channel closes are propagated to the local fd.
2195: * NB. this can only happen after LocalCommand has completed,
2196: * as it may want to write to stdout.
2197: */
1.537 djm 2198: if (!need_controlpersist_detach && stdfd_devnull(0, 1, 0) == -1)
1.540 djm 2199: error_f("stdfd_devnull failed");
1.301 djm 2200:
1.342 djm 2201: /*
2202: * If requested and we are not interested in replies to remote
2203: * forwarding requests, then let ssh continue in the background.
2204: */
1.564 djm 2205: if (options.fork_after_authentication) {
1.344 djm 2206: if (options.exit_on_forward_failure &&
2207: options.num_remote_forwards > 0) {
2208: debug("deferring postauth fork until remote forward "
2209: "confirmation received");
2210: } else
2211: fork_postauth();
1.318 djm 2212: }
1.31 markus 2213:
1.463 djm 2214: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2215: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2216: }
2217:
1.426 djm 2218: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2219: static void
1.544 djm 2220: load_public_identity_files(const struct ssh_conn_info *cinfo)
1.104 markus 2221: {
1.466 djm 2222: char *filename, *cp;
1.460 markus 2223: struct sshkey *public;
1.426 djm 2224: int i;
2225: u_int n_ids, n_certs;
1.335 djm 2226: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2227: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2228: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2229: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2230: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2231: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2232: #ifdef ENABLE_PKCS11
1.514 djm 2233: struct sshkey **keys = NULL;
2234: char **comments = NULL;
1.333 markus 2235: int nkeys;
1.335 djm 2236: #endif /* PKCS11 */
1.104 markus 2237:
1.426 djm 2238: n_ids = n_certs = 0;
1.398 tedu 2239: memset(identity_files, 0, sizeof(identity_files));
2240: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2241: memset(identity_file_userprovided, 0,
2242: sizeof(identity_file_userprovided));
1.426 djm 2243: memset(certificate_files, 0, sizeof(certificate_files));
2244: memset(certificates, 0, sizeof(certificates));
1.484 djm 2245: memset(certificate_file_userprovided, 0,
2246: sizeof(certificate_file_userprovided));
1.335 djm 2247:
2248: #ifdef ENABLE_PKCS11
1.333 markus 2249: if (options.pkcs11_provider != NULL &&
1.167 markus 2250: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2251: (pkcs11_init(!options.batch_mode) == 0) &&
2252: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1.514 djm 2253: &keys, &comments)) > 0) {
1.333 markus 2254: for (i = 0; i < nkeys; i++) {
1.335 djm 2255: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2256: sshkey_free(keys[i]);
1.514 djm 2257: free(comments[i]);
1.335 djm 2258: continue;
2259: }
2260: identity_keys[n_ids] = keys[i];
1.514 djm 2261: identity_files[n_ids] = comments[i]; /* transferred */
1.335 djm 2262: n_ids++;
1.167 markus 2263: }
1.378 djm 2264: free(keys);
1.514 djm 2265: free(comments);
1.127 markus 2266: }
1.333 markus 2267: #endif /* ENABLE_PKCS11 */
1.335 djm 2268: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2269: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2270: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2271: free(options.identity_files[i]);
1.426 djm 2272: options.identity_files[i] = NULL;
1.335 djm 2273: continue;
2274: }
1.490 dtucker 2275: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.544 djm 2276: filename = default_client_percent_dollar_expand(cp, cinfo);
1.378 djm 2277: free(cp);
1.483 markus 2278: check_load(sshkey_load_public(filename, &public, NULL),
1.576 djm 2279: &public, filename, "pubkey");
1.131 millert 2280: debug("identity file %s type %d", filename,
2281: public ? public->type : -1);
1.378 djm 2282: free(options.identity_files[i]);
1.335 djm 2283: identity_files[n_ids] = filename;
2284: identity_keys[n_ids] = public;
1.484 djm 2285: identity_file_userprovided[n_ids] =
2286: options.identity_file_userprovided[i];
1.335 djm 2287: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2288: continue;
2289:
1.426 djm 2290: /*
2291: * If no certificates have been explicitly listed then try
2292: * to add the default certificate variant too.
2293: */
2294: if (options.num_certificate_files != 0)
2295: continue;
1.335 djm 2296: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2297: check_load(sshkey_load_public(cp, &public, NULL),
1.576 djm 2298: &public, filename, "pubkey");
1.335 djm 2299: debug("identity file %s type %d", cp,
2300: public ? public->type : -1);
2301: if (public == NULL) {
1.378 djm 2302: free(cp);
1.335 djm 2303: continue;
2304: }
1.483 markus 2305: if (!sshkey_is_cert(public)) {
1.540 djm 2306: debug_f("key %s type %s is not a certificate",
2307: cp, sshkey_type(public));
1.483 markus 2308: sshkey_free(public);
1.378 djm 2309: free(cp);
1.335 djm 2310: continue;
2311: }
1.448 djm 2312: /* NB. leave filename pointing to private key */
2313: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2314: identity_keys[n_ids] = public;
1.484 djm 2315: identity_file_userprovided[n_ids] =
2316: options.identity_file_userprovided[i];
1.335 djm 2317: n_ids++;
2318: }
1.426 djm 2319:
2320: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
1.540 djm 2321: fatal_f("too many certificates");
1.426 djm 2322: for (i = 0; i < options.num_certificate_files; i++) {
2323: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2324: getuid());
1.544 djm 2325: filename = default_client_percent_dollar_expand(cp, cinfo);
1.426 djm 2326: free(cp);
2327:
1.483 markus 2328: check_load(sshkey_load_public(filename, &public, NULL),
1.576 djm 2329: &public, filename, "certificate");
1.426 djm 2330: debug("certificate file %s type %d", filename,
2331: public ? public->type : -1);
2332: free(options.certificate_files[i]);
2333: options.certificate_files[i] = NULL;
2334: if (public == NULL) {
2335: free(filename);
2336: continue;
2337: }
1.483 markus 2338: if (!sshkey_is_cert(public)) {
1.540 djm 2339: debug_f("key %s type %s is not a certificate",
2340: filename, sshkey_type(public));
1.483 markus 2341: sshkey_free(public);
1.426 djm 2342: free(filename);
2343: continue;
2344: }
2345: certificate_files[n_certs] = filename;
2346: certificates[n_certs] = public;
1.484 djm 2347: certificate_file_userprovided[n_certs] =
2348: options.certificate_file_userprovided[i];
1.426 djm 2349: ++n_certs;
2350: }
2351:
1.335 djm 2352: options.num_identity_files = n_ids;
2353: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2354: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2355: memcpy(options.identity_file_userprovided,
2356: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2357:
2358: options.num_certificate_files = n_certs;
2359: memcpy(options.certificate_files,
2360: certificate_files, sizeof(certificate_files));
2361: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2362: memcpy(options.certificate_file_userprovided,
2363: certificate_file_userprovided,
2364: sizeof(certificate_file_userprovided));
1.214 djm 2365: }
1.352 djm 2366:
2367: static void
2368: main_sigchld_handler(int sig)
2369: {
2370: int save_errno = errno;
2371: pid_t pid;
2372: int status;
2373:
2374: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2375: (pid == -1 && errno == EINTR))
1.352 djm 2376: ;
2377: errno = save_errno;
2378: }
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