Annotation of src/usr.bin/ssh/ssh.c, Revision 1.600
1.600 ! djm 1: /* $OpenBSD: ssh.c,v 1.599 2023/12/18 14:47:44 djm Exp $ */
1.1 deraadt 2: /*
1.32 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * Ssh client program. This program can be used to log into a remote machine.
7: * The software supports strong authentication, encryption, and forwarding
8: * of X11, TCP/IP, and authentication connections.
9: *
1.64 deraadt 10: * As far as I am concerned, the code I have written for this software
11: * can be used freely for any purpose. Any derived versions of this
12: * software must be clearly marked as such, and if the derived work is
13: * incompatible with the protocol description in the RFC file, it must be
14: * called by a name other than "ssh" or "Secure Shell".
15: *
16: * Copyright (c) 1999 Niels Provos. All rights reserved.
1.202 markus 17: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 18: *
1.529 dtucker 19: * Modified to work with SSLeay by Niels Provos <provos@citi.umich.edu>
1.64 deraadt 20: * in Canada (German citizen).
21: *
22: * Redistribution and use in source and binary forms, with or without
23: * modification, are permitted provided that the following conditions
24: * are met:
25: * 1. Redistributions of source code must retain the above copyright
26: * notice, this list of conditions and the following disclaimer.
27: * 2. Redistributions in binary form must reproduce the above copyright
28: * notice, this list of conditions and the following disclaimer in the
29: * documentation and/or other materials provided with the distribution.
30: *
31: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 41: */
1.1 deraadt 42:
1.293 deraadt 43: #include <sys/types.h>
1.312 djm 44: #include <sys/ioctl.h>
45: #include <sys/queue.h>
1.259 stevesk 46: #include <sys/resource.h>
1.280 stevesk 47: #include <sys/socket.h>
1.264 stevesk 48: #include <sys/stat.h>
1.312 djm 49: #include <sys/time.h>
1.352 djm 50: #include <sys/wait.h>
1.258 stevesk 51:
1.265 stevesk 52: #include <ctype.h>
1.285 stevesk 53: #include <errno.h>
1.281 stevesk 54: #include <fcntl.h>
1.286 stevesk 55: #include <netdb.h>
1.258 stevesk 56: #include <paths.h>
1.279 stevesk 57: #include <pwd.h>
1.263 stevesk 58: #include <signal.h>
1.287 stevesk 59: #include <stddef.h>
1.291 stevesk 60: #include <stdio.h>
1.290 stevesk 61: #include <stdlib.h>
1.289 stevesk 62: #include <string.h>
1.509 naddy 63: #include <stdarg.h>
1.288 stevesk 64: #include <unistd.h>
1.414 deraadt 65: #include <limits.h>
1.445 djm 66: #include <locale.h>
1.49 markus 67:
1.402 markus 68: #ifdef WITH_OPENSSL
1.49 markus 69: #include <openssl/evp.h>
1.72 markus 70: #include <openssl/err.h>
1.402 markus 71: #endif
1.1 deraadt 72:
1.293 deraadt 73: #include "xmalloc.h"
1.84 markus 74: #include "ssh.h"
75: #include "ssh2.h"
1.341 djm 76: #include "canohost.h"
1.84 markus 77: #include "compat.h"
78: #include "cipher.h"
1.1 deraadt 79: #include "packet.h"
1.482 markus 80: #include "sshbuf.h"
1.123 markus 81: #include "channels.h"
1.483 markus 82: #include "sshkey.h"
1.58 markus 83: #include "authfd.h"
1.49 markus 84: #include "authfile.h"
1.83 markus 85: #include "pathnames.h"
1.214 djm 86: #include "dispatch.h"
1.81 markus 87: #include "clientloop.h"
1.84 markus 88: #include "log.h"
1.406 millert 89: #include "misc.h"
1.84 markus 90: #include "readconf.h"
91: #include "sshconnect.h"
1.95 markus 92: #include "kex.h"
93: #include "mac.h"
1.213 deraadt 94: #include "sshpty.h"
1.212 djm 95: #include "match.h"
1.214 djm 96: #include "msg.h"
1.278 stevesk 97: #include "version.h"
1.412 djm 98: #include "ssherr.h"
1.420 djm 99: #include "myproposal.h"
1.49 markus 100:
1.333 markus 101: #ifdef ENABLE_PKCS11
102: #include "ssh-pkcs11.h"
1.137 jakob 103: #endif
1.498 djm 104:
1.49 markus 105: extern char *__progname;
1.1 deraadt 106:
1.316 djm 107: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 108: int debug_flag = 0;
109:
1.359 djm 110: /* Flag indicating whether a tty should be requested */
1.1 deraadt 111: int tty_flag = 0;
112:
1.33 markus 113: /*
1.344 djm 114: * Flag indicating that the current process should be backgrounded and
1.531 djm 115: * a new mux-client launched in the foreground for ControlPersist.
1.344 djm 116: */
1.593 djm 117: static int need_controlpersist_detach = 0;
1.344 djm 118:
1.531 djm 119: /* Copies of flags for ControlPersist foreground mux-client */
1.593 djm 120: static int ostdin_null_flag, osession_type, otty_flag, orequest_tty;
121: static int ofork_after_authentication;
1.344 djm 122:
123: /*
1.33 markus 124: * General data structure for command line options and options configurable
125: * in configuration files. See readconf.h.
126: */
1.1 deraadt 127: Options options;
128:
1.139 markus 129: /* optional user configfile */
130: char *config = NULL;
131:
1.33 markus 132: /*
133: * Name of the host we are connecting to. This is the name given on the
1.503 jmc 134: * command line, or the Hostname specified for the user-supplied name in a
1.33 markus 135: * configuration file.
136: */
1.1 deraadt 137: char *host;
138:
1.510 djm 139: /*
140: * A config can specify a path to forward, overriding SSH_AUTH_SOCK. If this is
141: * not NULL, forward the socket at this path instead.
142: */
143: char *forward_agent_sock_path = NULL;
144:
1.22 provos 145: /* socket address the host resolves to */
1.37 markus 146: struct sockaddr_storage hostaddr;
1.1 deraadt 147:
1.112 markus 148: /* Private host keys. */
1.173 markus 149: Sensitive sensitive_data;
1.1 deraadt 150:
1.45 markus 151: /* command to be executed */
1.482 markus 152: struct sshbuf *command;
1.45 markus 153:
1.170 markus 154: /* # of replies received for global requests */
1.523 djm 155: static int forward_confirms_pending = -1;
1.170 markus 156:
1.313 djm 157: /* mux.c */
158: extern int muxserver_sock;
159: extern u_int muxclient_command;
160:
1.1 deraadt 161: /* Prints a help message to the user. This function never returns. */
162:
1.126 itojun 163: static void
1.93 itojun 164: usage(void)
1.1 deraadt 165: {
1.208 markus 166: fprintf(stderr,
1.592 jmc 167: "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface] [-b bind_address]\n"
168: " [-c cipher_spec] [-D [bind_address:]port] [-E log_file]\n"
169: " [-e escape_char] [-F configfile] [-I pkcs11] [-i identity_file]\n"
170: " [-J destination] [-L address] [-l login_name] [-m mac_spec]\n"
1.596 djm 171: " [-O ctl_cmd] [-o option] [-P tag] [-p port] [-R address]\n"
172: " [-S ctl_path] [-W host:port] [-w local_tun[:remote_tun]]\n"
1.592 jmc 173: " destination [command [argument ...]]\n"
1.596 djm 174: " ssh [-Q query_option]\n"
1.208 markus 175: );
1.257 dtucker 176: exit(255);
1.1 deraadt 177: }
178:
1.544 djm 179: static int ssh_session2(struct ssh *, const struct ssh_conn_info *);
180: static void load_public_identity_files(const struct ssh_conn_info *);
1.352 djm 181: static void main_sigchld_handler(int);
1.312 djm 182:
1.361 djm 183: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
184: static void
185: tilde_expand_paths(char **paths, u_int num_paths)
186: {
187: u_int i;
188: char *cp;
189:
190: for (i = 0; i < num_paths; i++) {
1.490 dtucker 191: cp = tilde_expand_filename(paths[i], getuid());
1.378 djm 192: free(paths[i]);
1.361 djm 193: paths[i] = cp;
194: }
195: }
196:
1.527 dtucker 197: /*
198: * Expands the set of percent_expand options used by the majority of keywords
199: * in the client that support percent expansion.
200: * Caller must free returned string.
201: */
202: static char *
1.544 djm 203: default_client_percent_expand(const char *str,
204: const struct ssh_conn_info *cinfo)
1.527 dtucker 205: {
206: return percent_expand(str,
1.546 djm 207: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.527 dtucker 208: (char *)NULL);
209: }
210:
1.400 djm 211: /*
1.528 dtucker 212: * Expands the set of percent_expand options used by the majority of keywords
213: * AND perform environment variable substitution.
214: * Caller must free returned string.
215: */
216: static char *
1.544 djm 217: default_client_percent_dollar_expand(const char *str,
218: const struct ssh_conn_info *cinfo)
1.528 dtucker 219: {
220: char *ret;
221:
222: ret = percent_dollar_expand(str,
1.546 djm 223: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.528 dtucker 224: (char *)NULL);
225: if (ret == NULL)
226: fatal("invalid environment variable expansion");
227: return ret;
228: }
229:
230: /*
1.400 djm 231: * Attempt to resolve a host name / port to a set of addresses and
232: * optionally return any CNAMEs encountered along the way.
233: * Returns NULL on failure.
234: * NB. this function must operate with a options having undefined members.
235: */
1.385 djm 236: static struct addrinfo *
1.400 djm 237: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 238: {
239: char strport[NI_MAXSERV];
1.579 djm 240: const char *errstr = NULL;
1.385 djm 241: struct addrinfo hints, *res;
1.501 dtucker 242: int gaierr;
243: LogLevel loglevel = SYSLOG_LEVEL_DEBUG1;
1.385 djm 244:
1.400 djm 245: if (port <= 0)
246: port = default_ssh_port();
1.521 markus 247: if (cname != NULL)
248: *cname = '\0';
1.568 djm 249: debug3_f("lookup %s:%d", name, port);
1.400 djm 250:
1.427 djm 251: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 252: memset(&hints, 0, sizeof(hints));
1.400 djm 253: hints.ai_family = options.address_family == -1 ?
254: AF_UNSPEC : options.address_family;
1.385 djm 255: hints.ai_socktype = SOCK_STREAM;
256: if (cname != NULL)
257: hints.ai_flags = AI_CANONNAME;
258: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
259: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
260: loglevel = SYSLOG_LEVEL_ERROR;
261: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
262: __progname, name, ssh_gai_strerror(gaierr));
263: return NULL;
264: }
265: if (cname != NULL && res->ai_canonname != NULL) {
1.579 djm 266: if (!valid_domain(res->ai_canonname, 0, &errstr)) {
267: error("ignoring bad CNAME \"%s\" for host \"%s\": %s",
268: res->ai_canonname, name, errstr);
269: } else if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
1.540 djm 270: error_f("host \"%s\" cname \"%s\" too long (max %lu)",
271: name, res->ai_canonname, (u_long)clen);
1.385 djm 272: if (clen > 0)
273: *cname = '\0';
274: }
275: }
276: return res;
277: }
278:
1.470 djm 279: /* Returns non-zero if name can only be an address and not a hostname */
280: static int
281: is_addr_fast(const char *name)
282: {
283: return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
284: strspn(name, "0123456789.") == strlen(name));
285: }
286:
287: /* Returns non-zero if name represents a valid, single address */
288: static int
289: is_addr(const char *name)
290: {
291: char strport[NI_MAXSERV];
292: struct addrinfo hints, *res;
293:
294: if (is_addr_fast(name))
295: return 1;
296:
297: snprintf(strport, sizeof strport, "%u", default_ssh_port());
298: memset(&hints, 0, sizeof(hints));
299: hints.ai_family = options.address_family == -1 ?
300: AF_UNSPEC : options.address_family;
301: hints.ai_socktype = SOCK_STREAM;
302: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
303: if (getaddrinfo(name, strport, &hints, &res) != 0)
304: return 0;
305: if (res == NULL || res->ai_next != NULL) {
306: freeaddrinfo(res);
307: return 0;
308: }
309: freeaddrinfo(res);
310: return 1;
311: }
312:
1.385 djm 313: /*
1.413 djm 314: * Attempt to resolve a numeric host address / port to a single address.
315: * Returns a canonical address string.
316: * Returns NULL on failure.
317: * NB. this function must operate with a options having undefined members.
318: */
319: static struct addrinfo *
320: resolve_addr(const char *name, int port, char *caddr, size_t clen)
321: {
322: char addr[NI_MAXHOST], strport[NI_MAXSERV];
323: struct addrinfo hints, *res;
324: int gaierr;
325:
326: if (port <= 0)
327: port = default_ssh_port();
328: snprintf(strport, sizeof strport, "%u", port);
329: memset(&hints, 0, sizeof(hints));
330: hints.ai_family = options.address_family == -1 ?
331: AF_UNSPEC : options.address_family;
332: hints.ai_socktype = SOCK_STREAM;
333: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
334: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
1.540 djm 335: debug2_f("could not resolve name %.100s as address: %s",
336: name, ssh_gai_strerror(gaierr));
1.413 djm 337: return NULL;
338: }
339: if (res == NULL) {
1.540 djm 340: debug_f("getaddrinfo %.100s returned no addresses", name);
1.413 djm 341: return NULL;
342: }
343: if (res->ai_next != NULL) {
1.540 djm 344: debug_f("getaddrinfo %.100s returned multiple addresses", name);
1.413 djm 345: goto fail;
346: }
347: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
348: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
1.540 djm 349: debug_f("Could not format address for name %.100s: %s",
350: name, ssh_gai_strerror(gaierr));
1.413 djm 351: goto fail;
352: }
353: if (strlcpy(caddr, addr, clen) >= clen) {
1.540 djm 354: error_f("host \"%s\" addr \"%s\" too long (max %lu)",
355: name, addr, (u_long)clen);
1.413 djm 356: if (clen > 0)
357: *caddr = '\0';
358: fail:
359: freeaddrinfo(res);
360: return NULL;
361: }
362: return res;
363: }
364:
365: /*
1.385 djm 366: * Check whether the cname is a permitted replacement for the hostname
367: * and perform the replacement if it is.
1.400 djm 368: * NB. this function must operate with a options having undefined members.
1.385 djm 369: */
370: static int
1.443 djm 371: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 372: {
373: int i;
374: struct allowed_cname *rule;
375:
1.568 djm 376: if (*cname == '\0' || !config_has_permitted_cnames(&options) ||
1.385 djm 377: strcmp(*namep, cname) == 0)
378: return 0;
1.386 djm 379: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 380: return 0;
381: /*
1.386 djm 382: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 383: * a proxy or jump host unless the user specifically requests so.
1.385 djm 384: */
1.443 djm 385: if (!direct &&
1.386 djm 386: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 387: return 0;
1.540 djm 388: debug3_f("check \"%s\" CNAME \"%s\"", *namep, cname);
1.385 djm 389: for (i = 0; i < options.num_permitted_cnames; i++) {
390: rule = options.permitted_cnames + i;
1.418 djm 391: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
392: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 393: continue;
1.386 djm 394: verbose("Canonicalized DNS aliased hostname "
1.385 djm 395: "\"%s\" => \"%s\"", *namep, cname);
396: free(*namep);
397: *namep = xstrdup(cname);
398: return 1;
399: }
400: return 0;
401: }
402:
403: /*
404: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 405: * canonicalization rules. Returns the address list for the host or NULL
406: * if no name was found after canonicalization.
1.400 djm 407: * NB. this function must operate with a options having undefined members.
1.385 djm 408: */
409: static struct addrinfo *
1.400 djm 410: resolve_canonicalize(char **hostp, int port)
1.385 djm 411: {
1.443 djm 412: int i, direct, ndots;
1.413 djm 413: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 414: struct addrinfo *addrs;
415:
416: /*
1.470 djm 417: * Attempt to canonicalise addresses, regardless of
418: * whether hostname canonicalisation was requested
1.385 djm 419: */
1.413 djm 420: if ((addrs = resolve_addr(*hostp, port,
421: newname, sizeof(newname))) != NULL) {
1.540 djm 422: debug2_f("hostname %.100s is address", *hostp);
1.413 djm 423: if (strcasecmp(*hostp, newname) != 0) {
1.540 djm 424: debug2_f("canonicalised address \"%s\" => \"%s\"",
425: *hostp, newname);
1.413 djm 426: free(*hostp);
427: *hostp = xstrdup(newname);
428: }
429: return addrs;
430: }
431:
1.470 djm 432: /*
433: * If this looks like an address but didn't parse as one, it might
434: * be an address with an invalid interface scope. Skip further
435: * attempts at canonicalisation.
436: */
437: if (is_addr_fast(*hostp)) {
1.540 djm 438: debug_f("hostname %.100s is an unrecognised address", *hostp);
1.470 djm 439: return NULL;
440: }
441:
442: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
443: return NULL;
444:
445: /*
446: * Don't attempt to canonicalize names that will be interpreted by
447: * a proxy unless the user specifically requests so.
448: */
449: direct = option_clear_or_none(options.proxy_command) &&
1.588 djm 450: option_clear_or_none(options.jump_host);
1.470 djm 451: if (!direct &&
452: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
453: return NULL;
454:
1.428 djm 455: /* If domain name is anchored, then resolve it now */
456: if ((*hostp)[strlen(*hostp) - 1] == '.') {
1.540 djm 457: debug3_f("name is fully qualified");
1.428 djm 458: fullhost = xstrdup(*hostp);
459: if ((addrs = resolve_host(fullhost, port, 0,
460: newname, sizeof(newname))) != NULL)
461: goto found;
462: free(fullhost);
463: goto notfound;
464: }
465:
1.387 djm 466: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 467: ndots = 0;
468: for (cp = *hostp; *cp != '\0'; cp++) {
469: if (*cp == '.')
470: ndots++;
471: }
1.386 djm 472: if (ndots > options.canonicalize_max_dots) {
1.540 djm 473: debug3_f("not canonicalizing hostname \"%s\" (max dots %d)",
474: *hostp, options.canonicalize_max_dots);
1.385 djm 475: return NULL;
476: }
477: /* Attempt each supplied suffix */
478: for (i = 0; i < options.num_canonical_domains; i++) {
1.559 djm 479: if (strcasecmp(options.canonical_domains[i], "none") == 0)
480: break;
1.385 djm 481: xasprintf(&fullhost, "%s.%s.", *hostp,
482: options.canonical_domains[i]);
1.540 djm 483: debug3_f("attempting \"%s\" => \"%s\"", *hostp, fullhost);
1.400 djm 484: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 485: newname, sizeof(newname))) == NULL) {
1.385 djm 486: free(fullhost);
487: continue;
488: }
1.428 djm 489: found:
1.385 djm 490: /* Remove trailing '.' */
491: fullhost[strlen(fullhost) - 1] = '\0';
492: /* Follow CNAME if requested */
1.443 djm 493: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 494: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 495: *hostp, fullhost);
496: }
497: free(*hostp);
498: *hostp = fullhost;
499: return addrs;
500: }
1.428 djm 501: notfound:
1.386 djm 502: if (!options.canonicalize_fallback_local)
1.400 djm 503: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
1.540 djm 504: debug2_f("host %s not found in any suffix", *hostp);
1.385 djm 505: return NULL;
506: }
507:
1.32 deraadt 508: /*
1.576 djm 509: * Check the result of hostkey loading, ignoring some errors and either
510: * discarding the key or fatal()ing for others.
1.483 markus 511: */
512: static void
1.576 djm 513: check_load(int r, struct sshkey **k, const char *path, const char *message)
1.483 markus 514: {
515: switch (r) {
516: case 0:
1.576 djm 517: /* Check RSA keys size and discard if undersized */
518: if (k != NULL && *k != NULL &&
519: (r = sshkey_check_rsa_length(*k,
520: options.required_rsa_size)) != 0) {
521: error_r(r, "load %s \"%s\"", message, path);
522: free(*k);
523: *k = NULL;
524: }
1.483 markus 525: break;
526: case SSH_ERR_INTERNAL_ERROR:
527: case SSH_ERR_ALLOC_FAIL:
1.540 djm 528: fatal_r(r, "load %s \"%s\"", message, path);
1.483 markus 529: case SSH_ERR_SYSTEM_ERROR:
530: /* Ignore missing files */
531: if (errno == ENOENT)
532: break;
533: /* FALLTHROUGH */
534: default:
1.540 djm 535: error_r(r, "load %s \"%s\"", message, path);
1.483 markus 536: break;
537: }
538: }
539:
540: /*
1.400 djm 541: * Read per-user configuration file. Ignore the system wide config
542: * file if the user specifies a config file on the command line.
543: */
544: static void
1.496 djm 545: process_config_files(const char *host_name, struct passwd *pw, int final_pass,
546: int *want_final_pass)
1.400 djm 547: {
1.414 deraadt 548: char buf[PATH_MAX];
1.400 djm 549: int r;
550:
551: if (config != NULL) {
552: if (strcasecmp(config, "none") != 0 &&
1.466 djm 553: !read_config_file(config, pw, host, host_name, &options,
1.496 djm 554: SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0),
555: want_final_pass))
1.400 djm 556: fatal("Can't open user config file %.100s: "
557: "%.100s", config, strerror(errno));
558: } else {
559: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
560: _PATH_SSH_USER_CONFFILE);
561: if (r > 0 && (size_t)r < sizeof(buf))
1.466 djm 562: (void)read_config_file(buf, pw, host, host_name,
1.408 djm 563: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
1.496 djm 564: (final_pass ? SSHCONF_FINAL : 0), want_final_pass);
1.400 djm 565:
566: /* Read systemwide configuration file after user config. */
1.408 djm 567: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
1.466 djm 568: host, host_name, &options,
1.496 djm 569: final_pass ? SSHCONF_FINAL : 0, want_final_pass);
1.408 djm 570: }
571: }
572:
573: /* Rewrite the port number in an addrinfo list of addresses */
574: static void
575: set_addrinfo_port(struct addrinfo *addrs, int port)
576: {
577: struct addrinfo *addr;
578:
579: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
580: switch (addr->ai_family) {
581: case AF_INET:
582: ((struct sockaddr_in *)addr->ai_addr)->
583: sin_port = htons(port);
584: break;
585: case AF_INET6:
586: ((struct sockaddr_in6 *)addr->ai_addr)->
587: sin6_port = htons(port);
588: break;
589: }
1.400 djm 590: }
591: }
592:
1.544 djm 593: static void
594: ssh_conn_info_free(struct ssh_conn_info *cinfo)
595: {
596: if (cinfo == NULL)
597: return;
598: free(cinfo->conn_hash_hex);
599: free(cinfo->shorthost);
600: free(cinfo->uidstr);
601: free(cinfo->keyalias);
602: free(cinfo->thishost);
603: free(cinfo->host_arg);
604: free(cinfo->portstr);
605: free(cinfo->remhost);
606: free(cinfo->remuser);
607: free(cinfo->homedir);
608: free(cinfo->locuser);
1.597 djm 609: free(cinfo->jmphost);
1.544 djm 610: free(cinfo);
611: }
612:
1.599 djm 613: static int
614: valid_hostname(const char *s)
615: {
616: size_t i;
617:
618: if (*s == '-')
619: return 0;
620: for (i = 0; s[i] != 0; i++) {
621: if (strchr("'`\"$\\;&<>|(){}", s[i]) != NULL ||
622: isspace((u_char)s[i]) || iscntrl((u_char)s[i]))
623: return 0;
624: }
625: return 1;
626: }
627:
628: static int
629: valid_ruser(const char *s)
630: {
631: size_t i;
632:
633: if (*s == '-')
634: return 0;
635: for (i = 0; s[i] != 0; i++) {
636: if (strchr("'`\";&<>|(){}", s[i]) != NULL)
637: return 0;
638: /* Disallow '-' after whitespace */
639: if (isspace((u_char)s[i]) && s[i + 1] == '-')
640: return 0;
641: /* Disallow \ in last position */
642: if (s[i] == '\\' && s[i + 1] == '\0')
643: return 0;
644: }
645: return 1;
646: }
647:
1.400 djm 648: /*
1.32 deraadt 649: * Main program for the ssh client.
650: */
1.2 provos 651: int
652: main(int ac, char **av)
1.1 deraadt 653: {
1.437 djm 654: struct ssh *ssh = NULL;
1.462 djm 655: int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
1.496 djm 656: int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
1.583 dtucker 657: char *p, *cp, *line, *argv0, *logfile;
1.544 djm 658: char cname[NI_MAXHOST], thishost[NI_MAXHOST];
1.31 markus 659: struct stat st;
1.98 markus 660: struct passwd *pw;
1.144 stevesk 661: extern int optind, optreset;
662: extern char *optarg;
1.406 millert 663: struct Forward fwd;
1.385 djm 664: struct addrinfo *addrs = NULL;
1.513 dtucker 665: size_t n, len;
1.532 dtucker 666: u_int j;
1.544 djm 667: struct ssh_conn_info *cinfo = NULL;
1.250 djm 668:
669: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
670: sanitise_stdfd();
1.31 markus 671:
1.33 markus 672: /*
1.346 djm 673: * Discard other fds that are hanging around. These can cause problem
674: * with backgrounded ssh processes started by ControlPersist.
675: */
676: closefrom(STDERR_FILENO + 1);
677:
1.487 dtucker 678: if (getuid() != geteuid())
679: fatal("ssh setuid not supported.");
680: if (getgid() != getegid())
681: fatal("ssh setgid not supported.");
1.184 stevesk 682:
1.107 markus 683: /* Get user data. */
1.490 dtucker 684: pw = getpwuid(getuid());
1.107 markus 685: if (!pw) {
1.490 dtucker 686: logit("No user exists for uid %lu", (u_long)getuid());
1.257 dtucker 687: exit(255);
1.107 markus 688: }
689: /* Take a copy of the returned structure. */
690: pw = pwcopy(pw);
1.31 markus 691:
1.33 markus 692: /*
693: * Set our umask to something reasonable, as some files are created
694: * with the default umask. This will make them world-readable but
695: * writable only by the owner, which is ok for all files for which we
696: * don't set the modes explicitly.
697: */
1.577 djm 698: umask(022 | umask(077));
1.445 djm 699:
700: setlocale(LC_CTYPE, "");
1.31 markus 701:
1.316 djm 702: /*
703: * Initialize option structure to indicate that no values have been
704: * set.
705: */
1.31 markus 706: initialize_options(&options);
707:
1.463 djm 708: /*
709: * Prepare main ssh transport/connection structures
710: */
711: if ((ssh = ssh_alloc_session_state()) == NULL)
712: fatal("Couldn't allocate session state");
713: channel_init_channels(ssh);
714:
1.31 markus 715: /* Parse command-line arguments. */
716: host = NULL;
1.320 djm 717: use_syslog = 0;
1.375 dtucker 718: logfile = NULL;
1.325 markus 719: argv0 = av[0];
1.31 markus 720:
1.266 djm 721: again:
1.316 djm 722: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.591 djm 723: "AB:CD:E:F:GI:J:KL:MNO:P:Q:R:S:TVw:W:XYy")) != -1) { /* HUZdhjruz */
1.31 markus 724: switch (opt) {
1.91 jakob 725: case '1':
1.454 djm 726: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 727: break;
1.47 markus 728: case '2':
1.454 djm 729: /* Ignored */
1.47 markus 730: break;
1.37 markus 731: case '4':
1.196 djm 732: options.address_family = AF_INET;
1.37 markus 733: break;
734: case '6':
1.196 djm 735: options.address_family = AF_INET6;
1.37 markus 736: break;
1.31 markus 737: case 'n':
1.563 djm 738: options.stdin_null = 1;
1.31 markus 739: break;
740: case 'f':
1.564 djm 741: options.fork_after_authentication = 1;
1.563 djm 742: options.stdin_null = 1;
1.31 markus 743: break;
744: case 'x':
745: options.forward_x11 = 0;
746: break;
747: case 'X':
748: options.forward_x11 = 1;
749: break;
1.320 djm 750: case 'y':
751: use_syslog = 1;
752: break;
1.375 dtucker 753: case 'E':
1.422 dtucker 754: logfile = optarg;
1.375 dtucker 755: break;
1.408 djm 756: case 'G':
757: config_test = 1;
758: break;
1.202 markus 759: case 'Y':
760: options.forward_x11 = 1;
761: options.forward_x11_trusted = 1;
762: break;
1.31 markus 763: case 'g':
1.406 millert 764: options.fwd_opts.gateway_ports = 1;
1.31 markus 765: break;
1.229 djm 766: case 'O':
1.441 dtucker 767: if (options.stdio_forward_host != NULL)
1.332 djm 768: fatal("Cannot specify multiplexing "
769: "command with -W");
770: else if (muxclient_command != 0)
771: fatal("Multiplexing command already specified");
1.229 djm 772: if (strcmp(optarg, "check") == 0)
1.312 djm 773: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 774: else if (strcmp(optarg, "forward") == 0)
775: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 776: else if (strcmp(optarg, "exit") == 0)
1.312 djm 777: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 778: else if (strcmp(optarg, "stop") == 0)
779: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 780: else if (strcmp(optarg, "cancel") == 0)
781: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 782: else if (strcmp(optarg, "proxy") == 0)
783: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 784: else
785: fatal("Invalid multiplex command.");
786: break;
1.591 djm 787: case 'P':
788: if (options.tag == NULL)
789: options.tag = xstrdup(optarg);
1.376 djm 790: break;
1.394 deraadt 791: case 'Q':
1.376 djm 792: cp = NULL;
1.519 dtucker 793: if (strcmp(optarg, "cipher") == 0 ||
794: strcasecmp(optarg, "Ciphers") == 0)
1.393 djm 795: cp = cipher_alg_list('\n', 0);
1.394 deraadt 796: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 797: cp = cipher_alg_list('\n', 1);
1.519 dtucker 798: else if (strcmp(optarg, "mac") == 0 ||
799: strcasecmp(optarg, "MACs") == 0)
1.392 dtucker 800: cp = mac_alg_list('\n');
1.519 dtucker 801: else if (strcmp(optarg, "kex") == 0 ||
802: strcasecmp(optarg, "KexAlgorithms") == 0)
1.392 dtucker 803: cp = kex_alg_list('\n');
1.394 deraadt 804: else if (strcmp(optarg, "key") == 0)
1.451 djm 805: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 806: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 807: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 808: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 809: cp = sshkey_alg_list(0, 1, 0, '\n');
1.589 djm 810: else if (strcmp(optarg, "key-ca-sign") == 0 ||
811: strcasecmp(optarg, "CASignatureAlgorithms") == 0)
812: cp = sshkey_alg_list(0, 1, 1, '\n');
1.519 dtucker 813: else if (strcmp(optarg, "key-sig") == 0 ||
1.547 dtucker 814: strcasecmp(optarg, "PubkeyAcceptedKeyTypes") == 0 || /* deprecated name */
815: strcasecmp(optarg, "PubkeyAcceptedAlgorithms") == 0 ||
1.519 dtucker 816: strcasecmp(optarg, "HostKeyAlgorithms") == 0 ||
1.548 dtucker 817: strcasecmp(optarg, "HostbasedKeyTypes") == 0 || /* deprecated name */
818: strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 0 || /* deprecated name */
819: strcasecmp(optarg, "HostbasedAcceptedAlgorithms") == 0)
1.519 dtucker 820: cp = sshkey_alg_list(0, 0, 1, '\n');
1.491 djm 821: else if (strcmp(optarg, "sig") == 0)
1.492 djm 822: cp = sshkey_alg_list(0, 1, 1, '\n');
1.491 djm 823: else if (strcmp(optarg, "protocol-version") == 0)
1.416 djm 824: cp = xstrdup("2");
1.513 dtucker 825: else if (strcmp(optarg, "compression") == 0) {
826: cp = xstrdup(compression_alg_list(0));
827: len = strlen(cp);
828: for (n = 0; n < len; n++)
829: if (cp[n] == ',')
830: cp[n] = '\n';
831: } else if (strcmp(optarg, "help") == 0) {
1.491 djm 832: cp = xstrdup(
1.513 dtucker 833: "cipher\ncipher-auth\ncompression\nkex\n"
1.519 dtucker 834: "key\nkey-cert\nkey-plain\nkey-sig\nmac\n"
1.491 djm 835: "protocol-version\nsig");
1.416 djm 836: }
1.376 djm 837: if (cp == NULL)
838: fatal("Unsupported query \"%s\"", optarg);
839: printf("%s\n", cp);
840: free(cp);
841: exit(0);
1.31 markus 842: break;
843: case 'a':
844: options.forward_agent = 0;
1.53 markus 845: break;
846: case 'A':
847: options.forward_agent = 1;
1.31 markus 848: break;
849: case 'k':
1.204 dtucker 850: options.gss_deleg_creds = 0;
1.297 djm 851: break;
852: case 'K':
853: options.gss_authentication = 1;
854: options.gss_deleg_creds = 1;
1.31 markus 855: break;
856: case 'i':
1.490 dtucker 857: p = tilde_expand_filename(optarg, getuid());
1.505 deraadt 858: if (stat(p, &st) == -1)
1.128 fgsch 859: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 860: "not accessible: %s.\n", p,
1.231 otto 861: strerror(errno));
1.429 dtucker 862: else
863: add_identity_file(&options, NULL, p, 1);
864: free(p);
1.31 markus 865: break;
1.127 markus 866: case 'I':
1.333 markus 867: #ifdef ENABLE_PKCS11
1.422 dtucker 868: free(options.pkcs11_provider);
1.333 markus 869: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 870: #else
1.333 markus 871: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 872: #endif
1.127 markus 873: break;
1.443 djm 874: case 'J':
1.504 djm 875: if (options.jump_host != NULL) {
876: fatal("Only a single -J option is permitted "
877: "(use commas to separate multiple "
878: "jump hops)");
879: }
1.443 djm 880: if (options.proxy_command != NULL)
881: fatal("Cannot specify -J with ProxyCommand");
882: if (parse_jump(optarg, &options, 1) == -1)
883: fatal("Invalid -J argument");
884: options.proxy_command = xstrdup("none");
885: break;
1.31 markus 886: case 't':
1.359 djm 887: if (options.request_tty == REQUEST_TTY_YES)
888: options.request_tty = REQUEST_TTY_FORCE;
889: else
890: options.request_tty = REQUEST_TTY_YES;
1.31 markus 891: break;
892: case 'v':
1.197 markus 893: if (debug_flag == 0) {
1.66 markus 894: debug_flag = 1;
895: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 896: } else {
1.443 djm 897: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
898: debug_flag++;
1.197 markus 899: options.log_level++;
1.443 djm 900: }
1.197 markus 901: }
1.375 dtucker 902: break;
1.31 markus 903: case 'V':
1.209 markus 904: fprintf(stderr, "%s, %s\n",
1.541 dtucker 905: SSH_VERSION, SSH_OPENSSL_VERSION);
1.584 millert 906: exit(0);
1.31 markus 907: break;
1.255 reyk 908: case 'w':
1.256 reyk 909: if (options.tun_open == -1)
910: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 911: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 912: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 913: fprintf(stderr,
914: "Bad tun device '%s'\n", optarg);
1.257 dtucker 915: exit(255);
1.255 reyk 916: }
917: break;
1.331 dtucker 918: case 'W':
1.441 dtucker 919: if (options.stdio_forward_host != NULL)
1.332 djm 920: fatal("stdio forward already specified");
921: if (muxclient_command != 0)
922: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 923: if (parse_forward(&fwd, optarg, 1, 0)) {
1.590 dlg 924: options.stdio_forward_host =
925: fwd.listen_port == PORT_STREAMLOCAL ?
926: fwd.listen_path : fwd.listen_host;
1.441 dtucker 927: options.stdio_forward_port = fwd.listen_port;
1.378 djm 928: free(fwd.connect_host);
1.331 dtucker 929: } else {
930: fprintf(stderr,
931: "Bad stdio forwarding specification '%s'\n",
932: optarg);
933: exit(255);
934: }
1.359 djm 935: options.request_tty = REQUEST_TTY_NO;
1.560 djm 936: options.session_type = SESSION_TYPE_NONE;
1.331 dtucker 937: break;
1.31 markus 938: case 'q':
939: options.log_level = SYSLOG_LEVEL_QUIET;
940: break;
941: case 'e':
942: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 943: (u_char) optarg[1] >= 64 &&
944: (u_char) optarg[1] < 128)
1.78 markus 945: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 946: else if (strlen(optarg) == 1)
1.78 markus 947: options.escape_char = (u_char) optarg[0];
1.31 markus 948: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 949: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 950: else {
1.128 fgsch 951: fprintf(stderr, "Bad escape character '%s'.\n",
952: optarg);
1.257 dtucker 953: exit(255);
1.31 markus 954: }
955: break;
956: case 'c':
1.506 naddy 957: if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
1.420 djm 958: optarg + 1 : optarg)) {
959: fprintf(stderr, "Unknown cipher type '%s'\n",
960: optarg);
961: exit(255);
1.95 markus 962: }
1.456 djm 963: free(options.ciphers);
964: options.ciphers = xstrdup(optarg);
1.95 markus 965: break;
966: case 'm':
1.422 dtucker 967: if (mac_valid(optarg)) {
968: free(options.macs);
1.95 markus 969: options.macs = xstrdup(optarg);
1.422 dtucker 970: } else {
1.128 fgsch 971: fprintf(stderr, "Unknown mac type '%s'\n",
972: optarg);
1.257 dtucker 973: exit(255);
1.31 markus 974: }
975: break;
1.214 djm 976: case 'M':
1.242 djm 977: if (options.control_master == SSHCTL_MASTER_YES)
978: options.control_master = SSHCTL_MASTER_ASK;
979: else
980: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 981: break;
1.31 markus 982: case 'p':
1.465 millert 983: if (options.port == -1) {
984: options.port = a2port(optarg);
985: if (options.port <= 0) {
986: fprintf(stderr, "Bad port '%s'\n",
987: optarg);
988: exit(255);
989: }
1.109 markus 990: }
1.31 markus 991: break;
992: case 'l':
1.465 millert 993: if (options.user == NULL)
994: options.user = optarg;
1.31 markus 995: break;
1.141 stevesk 996:
997: case 'L':
1.324 djm 998: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 999: add_local_forward(&options, &fwd);
1000: else {
1.128 fgsch 1001: fprintf(stderr,
1.232 djm 1002: "Bad local forwarding specification '%s'\n",
1.128 fgsch 1003: optarg);
1.257 dtucker 1004: exit(255);
1.31 markus 1005: }
1.232 djm 1006: break;
1007:
1008: case 'R':
1.464 markus 1009: if (parse_forward(&fwd, optarg, 0, 1) ||
1010: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 1011: add_remote_forward(&options, &fwd);
1012: } else {
1.128 fgsch 1013: fprintf(stderr,
1.232 djm 1014: "Bad remote forwarding specification "
1015: "'%s'\n", optarg);
1.257 dtucker 1016: exit(255);
1.31 markus 1017: }
1018: break;
1.108 markus 1019:
1020: case 'D':
1.324 djm 1021: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 1022: add_local_forward(&options, &fwd);
1.232 djm 1023: } else {
1.322 stevesk 1024: fprintf(stderr,
1025: "Bad dynamic forwarding specification "
1026: "'%s'\n", optarg);
1.257 dtucker 1027: exit(255);
1.109 markus 1028: }
1.108 markus 1029: break;
1030:
1.31 markus 1031: case 'C':
1.513 dtucker 1032: #ifdef WITH_ZLIB
1.31 markus 1033: options.compression = 1;
1.513 dtucker 1034: #else
1035: error("Compression not supported, disabling.");
1036: #endif
1.31 markus 1037: break;
1.45 markus 1038: case 'N':
1.560 djm 1039: if (options.session_type != -1 &&
1040: options.session_type != SESSION_TYPE_NONE)
1041: fatal("Cannot specify -N with -s/SessionType");
1042: options.session_type = SESSION_TYPE_NONE;
1.359 djm 1043: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1044: break;
1045: case 'T':
1.359 djm 1046: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1047: break;
1.31 markus 1048: case 'o':
1.205 markus 1049: line = xstrdup(optarg);
1.408 djm 1050: if (process_config_line(&options, pw,
1051: host ? host : "", host ? host : "", line,
1052: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 1053: exit(255);
1.378 djm 1054: free(line);
1.31 markus 1055: break;
1.85 djm 1056: case 's':
1.560 djm 1057: if (options.session_type != -1 &&
1058: options.session_type != SESSION_TYPE_SUBSYSTEM)
1059: fatal("Cannot specify -s with -N/SessionType");
1060: options.session_type = SESSION_TYPE_SUBSYSTEM;
1.117 markus 1061: break;
1.214 djm 1062: case 'S':
1.431 mmcc 1063: free(options.control_path);
1.214 djm 1064: options.control_path = xstrdup(optarg);
1065: break;
1.117 markus 1066: case 'b':
1067: options.bind_address = optarg;
1.474 djm 1068: break;
1069: case 'B':
1070: options.bind_interface = optarg;
1.85 djm 1071: break;
1.139 markus 1072: case 'F':
1073: config = optarg;
1074: break;
1.31 markus 1075: default:
1076: usage();
1.1 deraadt 1077: }
1.31 markus 1078: }
1079:
1.462 djm 1080: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
1081: opt_terminated = 1;
1082:
1.128 fgsch 1083: ac -= optind;
1084: av += optind;
1085:
1.329 guenther 1086: if (ac > 0 && !host) {
1.465 millert 1087: int tport;
1088: char *tuser;
1089: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
1090: case -1:
1091: usage();
1092: break;
1093: case 0:
1094: if (options.user == NULL) {
1095: options.user = tuser;
1096: tuser = NULL;
1097: }
1098: free(tuser);
1099: if (options.port == -1 && tport != -1)
1100: options.port = tport;
1101: break;
1102: default:
1.128 fgsch 1103: p = xstrdup(*av);
1.188 markus 1104: cp = strrchr(p, '@');
1.465 millert 1105: if (cp != NULL) {
1106: if (cp == p)
1107: usage();
1108: if (options.user == NULL) {
1109: options.user = p;
1110: p = NULL;
1111: }
1112: *cp++ = '\0';
1113: host = xstrdup(cp);
1114: free(p);
1115: } else
1116: host = p;
1117: break;
1118: }
1.462 djm 1119: if (ac > 1 && !opt_terminated) {
1.189 millert 1120: optind = optreset = 1;
1.128 fgsch 1121: goto again;
1122: }
1.189 millert 1123: ac--, av++;
1.128 fgsch 1124: }
1125:
1.31 markus 1126: /* Check that we got a host name. */
1127: if (!host)
1128: usage();
1129:
1.599 djm 1130: if (!valid_hostname(host))
1131: fatal("hostname contains invalid characters");
1132: if (options.user != NULL && !valid_ruser(options.user))
1133: fatal("remote username contains invalid characters");
1.583 dtucker 1134: options.host_arg = xstrdup(host);
1.385 djm 1135:
1.402 markus 1136: #ifdef WITH_OPENSSL
1.350 djm 1137: OpenSSL_add_all_algorithms();
1.72 markus 1138: ERR_load_crypto_strings();
1.402 markus 1139: #endif
1.31 markus 1140:
1141: /* Initialize the command to execute on remote host. */
1.482 markus 1142: if ((command = sshbuf_new()) == NULL)
1143: fatal("sshbuf_new failed");
1.1 deraadt 1144:
1.33 markus 1145: /*
1146: * Save the command to execute on the remote host in a buffer. There
1147: * is no limit on the length of the command, except by the maximum
1148: * packet size. Also sets the tty flag if there is no command.
1149: */
1.128 fgsch 1150: if (!ac) {
1.31 markus 1151: /* No command specified - execute shell on a tty. */
1.560 djm 1152: if (options.session_type == SESSION_TYPE_SUBSYSTEM) {
1.128 fgsch 1153: fprintf(stderr,
1154: "You must specify a subsystem to invoke.\n");
1.85 djm 1155: usage();
1156: }
1.31 markus 1157: } else {
1.128 fgsch 1158: /* A command has been specified. Store it into the buffer. */
1159: for (i = 0; i < ac; i++) {
1.482 markus 1160: if ((r = sshbuf_putf(command, "%s%s",
1161: i ? " " : "", av[i])) != 0)
1.540 djm 1162: fatal_fr(r, "buffer error");
1.31 markus 1163: }
1164: }
1165:
1.575 djm 1166: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1167:
1.101 markus 1168: /*
1169: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1170: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1171: */
1.375 dtucker 1172: if (use_syslog && logfile != NULL)
1173: fatal("Can't specify both -y and -E");
1.422 dtucker 1174: if (logfile != NULL)
1.375 dtucker 1175: log_redirect_stderr_to(logfile);
1.325 markus 1176: log_init(argv0,
1.468 djm 1177: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1178: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1179: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1180: SYSLOG_FACILITY_USER : options.log_facility,
1181: !use_syslog);
1.375 dtucker 1182:
1183: if (debug_flag)
1.541 dtucker 1184: logit("%s, %s", SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 1185:
1.400 djm 1186: /* Parse the configuration files */
1.583 dtucker 1187: process_config_files(options.host_arg, pw, 0, &want_final_pass);
1.496 djm 1188: if (want_final_pass)
1189: debug("configuration requests final Match pass");
1.400 djm 1190:
1191: /* Hostname canonicalisation needs a few options filled. */
1192: fill_default_options_for_canonicalization(&options);
1193:
1194: /* If the user has replaced the hostname then take it into use now */
1195: if (options.hostname != NULL) {
1196: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1197: cp = percent_expand(options.hostname,
1198: "h", host, (char *)NULL);
1199: free(host);
1200: host = cp;
1.408 djm 1201: free(options.hostname);
1202: options.hostname = xstrdup(host);
1.400 djm 1203: }
1204:
1.470 djm 1205: /* Don't lowercase addresses, they will be explicitly canonicalised */
1206: if ((was_addr = is_addr(host)) == 0)
1207: lowercase(host);
1208:
1209: /*
1210: * Try to canonicalize if requested by configuration or the
1211: * hostname is an address.
1212: */
1213: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1214: addrs = resolve_canonicalize(&host, options.port);
1215:
1.139 markus 1216: /*
1.401 djm 1217: * If CanonicalizePermittedCNAMEs have been specified but
1218: * other canonicalization did not happen (by not being requested
1219: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1220: * as a result of CNAME following.
1.401 djm 1221: *
1222: * Try to resolve the bare hostname name using the system resolver's
1223: * usual search rules and then apply the CNAME follow rules.
1224: *
1225: * Skip the lookup if a ProxyCommand is being used unless the user
1226: * has specifically requested canonicalisation for this case via
1227: * CanonicalizeHostname=always
1.139 markus 1228: */
1.443 djm 1229: direct = option_clear_or_none(options.proxy_command) &&
1.588 djm 1230: option_clear_or_none(options.jump_host);
1.568 djm 1231: if (addrs == NULL && config_has_permitted_cnames(&options) && (direct ||
1.443 djm 1232: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1233: if ((addrs = resolve_host(host, options.port,
1.493 djm 1234: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1235: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1236: if (direct)
1.403 djm 1237: cleanup_exit(255); /* logged in resolve_host */
1238: } else
1.443 djm 1239: check_follow_cname(direct, &host, cname);
1.400 djm 1240: }
1.139 markus 1241:
1.400 djm 1242: /*
1.408 djm 1243: * If canonicalisation is enabled then re-parse the configuration
1244: * files as new stanzas may match.
1.400 djm 1245: */
1.496 djm 1246: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1247: debug("hostname canonicalisation enabled, "
1248: "will re-parse configuration");
1249: want_final_pass = 1;
1250: }
1251:
1252: if (want_final_pass) {
1253: debug("re-parsing configuration");
1.408 djm 1254: free(options.hostname);
1255: options.hostname = xstrdup(host);
1.583 dtucker 1256: process_config_files(options.host_arg, pw, 1, NULL);
1.408 djm 1257: /*
1258: * Address resolution happens early with canonicalisation
1259: * enabled and the port number may have changed since, so
1260: * reset it in address list
1261: */
1262: if (addrs != NULL && options.port > 0)
1263: set_addrinfo_port(addrs, options.port);
1.139 markus 1264: }
1.31 markus 1265:
1266: /* Fill configuration defaults. */
1.543 djm 1267: if (fill_default_options(&options) != 0)
1268: cleanup_exit(255);
1.443 djm 1269:
1.534 dtucker 1270: if (options.user == NULL)
1271: options.user = xstrdup(pw->pw_name);
1272:
1.443 djm 1273: /*
1274: * If ProxyJump option specified, then construct a ProxyCommand now.
1275: */
1276: if (options.jump_host != NULL) {
1277: char port_s[8];
1.534 dtucker 1278: const char *jumpuser = options.jump_user, *sshbin = argv0;
1.520 dtucker 1279: int port = options.port, jumpport = options.jump_port;
1280:
1281: if (port <= 0)
1282: port = default_ssh_port();
1283: if (jumpport <= 0)
1284: jumpport = default_ssh_port();
1.534 dtucker 1285: if (jumpuser == NULL)
1286: jumpuser = options.user;
1287: if (strcmp(options.jump_host, host) == 0 && port == jumpport &&
1288: strcmp(options.user, jumpuser) == 0)
1.520 dtucker 1289: fatal("jumphost loop via %s", options.jump_host);
1.478 djm 1290:
1291: /*
1292: * Try to use SSH indicated by argv[0], but fall back to
1293: * "ssh" if it appears unavailable.
1294: */
1295: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1296: sshbin = "ssh";
1.443 djm 1297:
1298: /* Consistency check */
1299: if (options.proxy_command != NULL)
1300: fatal("inconsistent options: ProxyCommand+ProxyJump");
1301: /* Never use FD passing for ProxyJump */
1302: options.proxy_use_fdpass = 0;
1303: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1304: xasprintf(&options.proxy_command,
1.478 djm 1305: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1306: sshbin,
1.443 djm 1307: /* Optional "-l user" argument if jump_user set */
1308: options.jump_user == NULL ? "" : " -l ",
1309: options.jump_user == NULL ? "" : options.jump_user,
1310: /* Optional "-p port" argument if jump_port set */
1311: options.jump_port <= 0 ? "" : " -p ",
1312: options.jump_port <= 0 ? "" : port_s,
1313: /* Optional additional jump hosts ",..." */
1314: options.jump_extra == NULL ? "" : " -J ",
1315: options.jump_extra == NULL ? "" : options.jump_extra,
1.571 jsg 1316: /* Optional "-F" argument if -F specified */
1.443 djm 1317: config == NULL ? "" : " -F ",
1318: config == NULL ? "" : config,
1319: /* Optional "-v" arguments if -v set */
1320: debug_flag ? " -" : "",
1321: debug_flag, "vvv",
1322: /* Mandatory hostname */
1323: options.jump_host);
1324: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1325: options.proxy_command);
1326: }
1.31 markus 1327:
1.400 djm 1328: if (options.port == 0)
1329: options.port = default_ssh_port();
1.463 djm 1330: channel_set_af(ssh, options.address_family);
1.196 djm 1331:
1.383 djm 1332: /* Tidy and check options */
1333: if (options.host_key_alias != NULL)
1334: lowercase(options.host_key_alias);
1335: if (options.proxy_command != NULL &&
1336: strcmp(options.proxy_command, "-") == 0 &&
1337: options.proxy_use_fdpass)
1338: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.516 markus 1339: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1340: if (options.control_persist && options.control_path != NULL) {
1341: debug("UpdateHostKeys=ask is incompatible with "
1342: "ControlPersist; disabling");
1343: options.update_hostkeys = 0;
1344: } else if (sshbuf_len(command) != 0 ||
1345: options.remote_command != NULL ||
1346: options.request_tty == REQUEST_TTY_NO) {
1347: debug("UpdateHostKeys=ask is incompatible with "
1348: "remote command execution; disabling");
1.517 djm 1349: options.update_hostkeys = 0;
1350: } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1351: /* no point logging anything; user won't see it */
1.516 markus 1352: options.update_hostkeys = 0;
1353: }
1.415 djm 1354: }
1.430 djm 1355: if (options.connection_attempts <= 0)
1356: fatal("Invalid number of ConnectionAttempts");
1357:
1.482 markus 1358: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1359: fatal("Cannot execute command-line and remote command.");
1360:
1361: /* Cannot fork to background if no command. */
1.564 djm 1362: if (options.fork_after_authentication && sshbuf_len(command) == 0 &&
1.562 djm 1363: options.remote_command == NULL &&
1364: options.session_type != SESSION_TYPE_NONE)
1.461 bluhm 1365: fatal("Cannot fork into background without a command "
1366: "to execute.");
1367:
1.31 markus 1368: /* reinit */
1.452 dtucker 1369: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.559 djm 1370: for (j = 0; j < options.num_log_verbose; j++) {
1371: if (strcasecmp(options.log_verbose[j], "none") == 0)
1372: break;
1.539 djm 1373: log_verbose_add(options.log_verbose[j]);
1.559 djm 1374: }
1.370 djm 1375:
1376: if (options.request_tty == REQUEST_TTY_YES ||
1377: options.request_tty == REQUEST_TTY_FORCE)
1378: tty_flag = 1;
1379:
1380: /* Allocate a tty by default if no command specified. */
1.482 markus 1381: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1382: tty_flag = options.request_tty != REQUEST_TTY_NO;
1383:
1384: /* Force no tty */
1.447 markus 1385: if (options.request_tty == REQUEST_TTY_NO ||
1.570 djm 1386: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY) ||
1387: options.session_type == SESSION_TYPE_NONE)
1.370 djm 1388: tty_flag = 0;
1389: /* Do not allocate a tty if stdin is not a tty. */
1.563 djm 1390: if ((!isatty(fileno(stdin)) || options.stdin_null) &&
1.370 djm 1391: options.request_tty != REQUEST_TTY_FORCE) {
1392: if (tty_flag)
1393: logit("Pseudo-terminal will not be allocated because "
1394: "stdin is not a terminal.");
1395: tty_flag = 0;
1396: }
1.343 djm 1397:
1.466 djm 1398: /* Set up strings used to percent_expand() arguments */
1.544 djm 1399: cinfo = xcalloc(1, sizeof(*cinfo));
1.358 djm 1400: if (gethostname(thishost, sizeof(thishost)) == -1)
1401: fatal("gethostname: %s", strerror(errno));
1.544 djm 1402: cinfo->thishost = xstrdup(thishost);
1403: thishost[strcspn(thishost, ".")] = '\0';
1404: cinfo->shorthost = xstrdup(thishost);
1405: xasprintf(&cinfo->portstr, "%d", options.port);
1406: xasprintf(&cinfo->uidstr, "%llu",
1.479 djm 1407: (unsigned long long)pw->pw_uid);
1.544 djm 1408: cinfo->keyalias = xstrdup(options.host_key_alias ?
1.583 dtucker 1409: options.host_key_alias : options.host_arg);
1410: cinfo->host_arg = xstrdup(options.host_arg);
1.544 djm 1411: cinfo->remhost = xstrdup(host);
1412: cinfo->remuser = xstrdup(options.user);
1413: cinfo->homedir = xstrdup(pw->pw_dir);
1414: cinfo->locuser = xstrdup(pw->pw_name);
1.597 djm 1415: cinfo->jmphost = xstrdup(options.jump_host == NULL ?
1416: "" : options.jump_host);
1.598 djm 1417: cinfo->conn_hash_hex = ssh_connection_hash(cinfo->thishost,
1418: cinfo->remhost, cinfo->portstr, cinfo->remuser, cinfo->jmphost);
1.405 djm 1419:
1.466 djm 1420: /*
1421: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1422: * after port-forwarding is set up, so it may pick up any local
1423: * tunnel interface name allocated.
1424: */
1.461 bluhm 1425: if (options.remote_command != NULL) {
1426: debug3("expanding RemoteCommand: %s", options.remote_command);
1427: cp = options.remote_command;
1.527 dtucker 1428: options.remote_command = default_client_percent_expand(cp,
1.544 djm 1429: cinfo);
1.461 bluhm 1430: debug3("expanded RemoteCommand: %s", options.remote_command);
1431: free(cp);
1.482 markus 1432: if ((r = sshbuf_put(command, options.remote_command,
1433: strlen(options.remote_command))) != 0)
1.540 djm 1434: fatal_fr(r, "buffer error");
1.304 dtucker 1435: }
1.31 markus 1436:
1.214 djm 1437: if (options.control_path != NULL) {
1.490 dtucker 1438: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1439: free(options.control_path);
1.528 dtucker 1440: options.control_path = default_client_percent_dollar_expand(cp,
1.544 djm 1441: cinfo);
1.378 djm 1442: free(cp);
1.214 djm 1443: }
1.408 djm 1444:
1.522 dtucker 1445: if (options.identity_agent != NULL) {
1446: p = tilde_expand_filename(options.identity_agent, getuid());
1.544 djm 1447: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1448: free(p);
1449: free(options.identity_agent);
1450: options.identity_agent = cp;
1.586 dtucker 1451: }
1452:
1453: if (options.revoked_host_keys != NULL) {
1454: p = tilde_expand_filename(options.revoked_host_keys, getuid());
1455: cp = default_client_percent_dollar_expand(p, cinfo);
1456: free(p);
1457: free(options.revoked_host_keys);
1458: options.revoked_host_keys = cp;
1.522 dtucker 1459: }
1460:
1461: if (options.forward_agent_sock_path != NULL) {
1462: p = tilde_expand_filename(options.forward_agent_sock_path,
1463: getuid());
1.544 djm 1464: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1465: free(p);
1466: free(options.forward_agent_sock_path);
1467: options.forward_agent_sock_path = cp;
1.552 djm 1468: if (stat(options.forward_agent_sock_path, &st) != 0) {
1469: error("Cannot forward agent socket path \"%s\": %s",
1470: options.forward_agent_sock_path, strerror(errno));
1471: if (options.exit_on_forward_failure)
1472: cleanup_exit(255);
1473: }
1.532 dtucker 1474: }
1475:
1.545 djm 1476: if (options.num_system_hostfiles > 0 &&
1477: strcasecmp(options.system_hostfiles[0], "none") == 0) {
1478: if (options.num_system_hostfiles > 1)
1479: fatal("Invalid GlobalKnownHostsFiles: \"none\" "
1480: "appears with other entries");
1481: free(options.system_hostfiles[0]);
1482: options.system_hostfiles[0] = NULL;
1483: options.num_system_hostfiles = 0;
1484: }
1485:
1486: if (options.num_user_hostfiles > 0 &&
1487: strcasecmp(options.user_hostfiles[0], "none") == 0) {
1488: if (options.num_user_hostfiles > 1)
1489: fatal("Invalid UserKnownHostsFiles: \"none\" "
1490: "appears with other entries");
1491: free(options.user_hostfiles[0]);
1492: options.user_hostfiles[0] = NULL;
1493: options.num_user_hostfiles = 0;
1494: }
1.532 dtucker 1495: for (j = 0; j < options.num_user_hostfiles; j++) {
1.545 djm 1496: if (options.user_hostfiles[j] == NULL)
1497: continue;
1498: cp = tilde_expand_filename(options.user_hostfiles[j], getuid());
1499: p = default_client_percent_dollar_expand(cp, cinfo);
1500: if (strcmp(options.user_hostfiles[j], p) != 0)
1501: debug3("expanded UserKnownHostsFile '%s' -> "
1502: "'%s'", options.user_hostfiles[j], p);
1503: free(options.user_hostfiles[j]);
1504: free(cp);
1505: options.user_hostfiles[j] = p;
1.522 dtucker 1506: }
1507:
1.527 dtucker 1508: for (i = 0; i < options.num_local_forwards; i++) {
1509: if (options.local_forwards[i].listen_path != NULL) {
1510: cp = options.local_forwards[i].listen_path;
1511: p = options.local_forwards[i].listen_path =
1.544 djm 1512: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1513: if (strcmp(cp, p) != 0)
1514: debug3("expanded LocalForward listen path "
1515: "'%s' -> '%s'", cp, p);
1516: free(cp);
1517: }
1518: if (options.local_forwards[i].connect_path != NULL) {
1519: cp = options.local_forwards[i].connect_path;
1520: p = options.local_forwards[i].connect_path =
1.544 djm 1521: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1522: if (strcmp(cp, p) != 0)
1523: debug3("expanded LocalForward connect path "
1524: "'%s' -> '%s'", cp, p);
1525: free(cp);
1526: }
1527: }
1528:
1529: for (i = 0; i < options.num_remote_forwards; i++) {
1530: if (options.remote_forwards[i].listen_path != NULL) {
1531: cp = options.remote_forwards[i].listen_path;
1532: p = options.remote_forwards[i].listen_path =
1.544 djm 1533: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1534: if (strcmp(cp, p) != 0)
1535: debug3("expanded RemoteForward listen path "
1536: "'%s' -> '%s'", cp, p);
1537: free(cp);
1538: }
1539: if (options.remote_forwards[i].connect_path != NULL) {
1540: cp = options.remote_forwards[i].connect_path;
1541: p = options.remote_forwards[i].connect_path =
1.544 djm 1542: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1543: if (strcmp(cp, p) != 0)
1544: debug3("expanded RemoteForward connect path "
1545: "'%s' -> '%s'", cp, p);
1546: free(cp);
1547: }
1548: }
1549:
1.408 djm 1550: if (config_test) {
1551: dump_client_config(&options, host);
1552: exit(0);
1.508 djm 1553: }
1554:
1555: /* Expand SecurityKeyProvider if it refers to an environment variable */
1556: if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1557: strlen(options.sk_provider) > 1) {
1558: if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1.518 naddy 1559: debug("Authenticator provider %s did not resolve; "
1.508 djm 1560: "disabling", options.sk_provider);
1561: free(options.sk_provider);
1562: options.sk_provider = NULL;
1563: } else {
1564: debug2("resolved SecurityKeyProvider %s => %s",
1565: options.sk_provider, cp);
1566: free(options.sk_provider);
1567: options.sk_provider = xstrdup(cp);
1568: }
1.408 djm 1569: }
1.405 djm 1570:
1.312 djm 1571: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1572: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1573: if (options.control_path != NULL) {
1574: int sock;
1575: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1576: ssh_packet_set_connection(ssh, sock, sock);
1.499 djm 1577: ssh_packet_set_mux(ssh);
1.447 markus 1578: goto skip_connect;
1579: }
1580: }
1.401 djm 1581:
1582: /*
1583: * If hostname canonicalisation was not enabled, then we may not
1584: * have yet resolved the hostname. Do so now.
1585: */
1586: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1587: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1588: if ((addrs = resolve_host(host, options.port, 1,
1589: cname, sizeof(cname))) == NULL)
1590: cleanup_exit(255); /* resolve_host logs the error */
1591: }
1.214 djm 1592:
1.542 dtucker 1593: if (options.connection_timeout >= INT_MAX/1000)
1594: timeout_ms = INT_MAX;
1595: else
1596: timeout_ms = options.connection_timeout * 1000;
1.595 djm 1597:
1598: /* Apply channels timeouts, if set */
1599: channel_clear_timeouts(ssh);
1600: for (j = 0; j < options.num_channel_timeouts; j++) {
1601: debug3("applying channel timeout %s",
1602: options.channel_timeouts[j]);
1603: if (parse_pattern_interval(options.channel_timeouts[j],
1604: &cp, &i) != 0) {
1605: fatal_f("internal error: bad timeout %s",
1606: options.channel_timeouts[j]);
1607: }
1608: channel_add_timeout(ssh, cp, i);
1609: free(cp);
1610: }
1.303 djm 1611:
1.77 markus 1612: /* Open a connection to the remote host. */
1.583 dtucker 1613: if (ssh_connect(ssh, host, options.host_arg, addrs, &hostaddr,
1614: options.port, options.connection_attempts,
1.488 dtucker 1615: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1616: exit(255);
1.31 markus 1617:
1.391 djm 1618: if (addrs != NULL)
1619: freeaddrinfo(addrs);
1620:
1.499 djm 1621: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1622: options.server_alive_count_max);
1623:
1.303 djm 1624: if (timeout_ms > 0)
1625: debug3("timeout: %d ms remain after connect", timeout_ms);
1626:
1.33 markus 1627: /*
1.485 dtucker 1628: * If we successfully made the connection and we have hostbased auth
1629: * enabled, load the public keys so we can later use the ssh-keysign
1630: * helper to sign challenges.
1.33 markus 1631: */
1.112 markus 1632: sensitive_data.nkeys = 0;
1633: sensitive_data.keys = NULL;
1.457 djm 1634: if (options.hostbased_authentication) {
1.581 dtucker 1635: int loaded = 0;
1636:
1.486 dtucker 1637: sensitive_data.nkeys = 10;
1.274 deraadt 1638: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.578 jsg 1639: sizeof(*sensitive_data.keys));
1.483 markus 1640:
1641: /* XXX check errors? */
1.486 dtucker 1642: #define L_PUBKEY(p,o) do { \
1643: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1644: fatal_f("pubkey out of array bounds"); \
1.483 markus 1645: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.576 djm 1646: &(sensitive_data.keys[o]), p, "pubkey"); \
1.581 dtucker 1647: if (sensitive_data.keys[o] != NULL) { \
1.572 djm 1648: debug2("hostbased key %d: %s key from \"%s\"", o, \
1649: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.581 dtucker 1650: loaded++; \
1651: } \
1.486 dtucker 1652: } while (0)
1653: #define L_CERT(p,o) do { \
1654: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1655: fatal_f("cert out of array bounds"); \
1.576 djm 1656: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), \
1657: &(sensitive_data.keys[o]), p, "cert"); \
1.581 dtucker 1658: if (sensitive_data.keys[o] != NULL) { \
1.572 djm 1659: debug2("hostbased key %d: %s cert from \"%s\"", o, \
1660: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.581 dtucker 1661: loaded++; \
1662: } \
1.486 dtucker 1663: } while (0)
1.177 markus 1664:
1.485 dtucker 1665: if (options.hostbased_authentication == 1) {
1.486 dtucker 1666: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1667: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1668: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1.600 ! djm 1669: #ifdef WITH_DSA
1.486 dtucker 1670: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1.600 ! djm 1671: #endif
1.486 dtucker 1672: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1673: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1674: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1.600 ! djm 1675: #ifdef WITH_DSA
1.486 dtucker 1676: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1.600 ! djm 1677: #endif
1.486 dtucker 1678: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1679: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.581 dtucker 1680: if (loaded == 0)
1681: debug("HostbasedAuthentication enabled but no "
1682: "local public host keys could be loaded.");
1.173 markus 1683: }
1.367 djm 1684: }
1.31 markus 1685:
1.104 markus 1686: /* load options.identity_files */
1.544 djm 1687: load_public_identity_files(cinfo);
1.439 markus 1688:
1.476 djm 1689: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1690: if (options.identity_agent &&
1691: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1692: if (strcmp(options.identity_agent, "none") == 0) {
1693: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1694: } else {
1.522 dtucker 1695: cp = options.identity_agent;
1.528 dtucker 1696: /* legacy (limited) format */
1697: if (cp[0] == '$' && cp[1] != '{') {
1.494 djm 1698: if (!valid_env_name(cp + 1)) {
1699: fatal("Invalid IdentityAgent "
1700: "environment variable name %s", cp);
1701: }
1702: if ((p = getenv(cp + 1)) == NULL)
1703: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1704: else
1705: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1706: } else {
1707: /* identity_agent specifies a path directly */
1708: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1709: }
1.510 djm 1710: }
1711: }
1712:
1.522 dtucker 1713: if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1.526 djm 1714: cp = options.forward_agent_sock_path;
1.510 djm 1715: if (cp[0] == '$') {
1716: if (!valid_env_name(cp + 1)) {
1717: fatal("Invalid ForwardAgent environment variable name %s", cp);
1718: }
1719: if ((p = getenv(cp + 1)) != NULL)
1.566 dtucker 1720: forward_agent_sock_path = xstrdup(p);
1.510 djm 1721: else
1722: options.forward_agent = 0;
1723: free(cp);
1724: } else {
1725: forward_agent_sock_path = cp;
1.439 markus 1726: }
1727: }
1.104 markus 1728:
1729: /* Expand ~ in known host file names. */
1.361 djm 1730: tilde_expand_paths(options.system_hostfiles,
1731: options.num_system_hostfiles);
1732: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1733:
1.512 dtucker 1734: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1735:
1.316 djm 1736: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1737: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.546 djm 1738: options.port, pw, timeout_ms, cinfo);
1.31 markus 1739:
1.112 markus 1740: /* We no longer need the private host keys. Clear them now. */
1741: if (sensitive_data.nkeys != 0) {
1742: for (i = 0; i < sensitive_data.nkeys; i++) {
1743: if (sensitive_data.keys[i] != NULL) {
1744: /* Destroys contents safely */
1745: debug3("clear hostkey %d", i);
1.483 markus 1746: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1747: sensitive_data.keys[i] = NULL;
1748: }
1749: }
1.378 djm 1750: free(sensitive_data.keys);
1.134 markus 1751: }
1752: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1753: free(options.identity_files[i]);
1754: options.identity_files[i] = NULL;
1.134 markus 1755: if (options.identity_keys[i]) {
1.483 markus 1756: sshkey_free(options.identity_keys[i]);
1.134 markus 1757: options.identity_keys[i] = NULL;
1758: }
1.112 markus 1759: }
1.426 djm 1760: for (i = 0; i < options.num_certificate_files; i++) {
1761: free(options.certificate_files[i]);
1762: options.certificate_files[i] = NULL;
1763: }
1.553 djm 1764:
1765: #ifdef ENABLE_PKCS11
1766: (void)pkcs11_del_provider(options.pkcs11_provider);
1767: #endif
1.31 markus 1768:
1.447 markus 1769: skip_connect:
1.544 djm 1770: exit_status = ssh_session2(ssh, cinfo);
1771: ssh_conn_info_free(cinfo);
1.499 djm 1772: ssh_packet_close(ssh);
1.186 djm 1773:
1.312 djm 1774: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1775: unlink(options.control_path);
1776:
1.353 djm 1777: /* Kill ProxyCommand if it is running. */
1778: ssh_kill_proxy_command();
1.186 djm 1779:
1.45 markus 1780: return exit_status;
1781: }
1782:
1.344 djm 1783: static void
1784: control_persist_detach(void)
1785: {
1786: pid_t pid;
1787:
1.540 djm 1788: debug_f("backgrounding master process");
1.344 djm 1789:
1.473 djm 1790: /*
1791: * master (current process) into the background, and make the
1792: * foreground process a client of the backgrounded master.
1793: */
1.344 djm 1794: switch ((pid = fork())) {
1795: case -1:
1.540 djm 1796: fatal_f("fork: %s", strerror(errno));
1.344 djm 1797: case 0:
1798: /* Child: master process continues mainloop */
1.473 djm 1799: break;
1800: default:
1.593 djm 1801: /*
1802: * Parent: set up mux client to connect to backgrounded
1803: * master.
1804: */
1.540 djm 1805: debug2_f("background process is %ld", (long)pid);
1.563 djm 1806: options.stdin_null = ostdin_null_flag;
1.359 djm 1807: options.request_tty = orequest_tty;
1.344 djm 1808: tty_flag = otty_flag;
1.593 djm 1809: options.fork_after_authentication = ofork_after_authentication;
1.561 djm 1810: options.session_type = osession_type;
1.473 djm 1811: close(muxserver_sock);
1812: muxserver_sock = -1;
1.351 markus 1813: options.control_master = SSHCTL_MASTER_NO;
1.587 dtucker 1814: (void)muxclient(options.control_path);
1.344 djm 1815: /* muxclient() doesn't return on success. */
1.473 djm 1816: fatal("Failed to connect to new control master");
1817: }
1.537 djm 1818: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1819: error_f("stdfd_devnull failed");
1.381 djm 1820: daemon(1, 1);
1.362 djm 1821: setproctitle("%s [mux]", options.control_path);
1.344 djm 1822: }
1823:
1824: /* Do fork() after authentication. Used by "ssh -f" */
1825: static void
1826: fork_postauth(void)
1827: {
1828: if (need_controlpersist_detach)
1829: control_persist_detach();
1830: debug("forking to background");
1.564 djm 1831: options.fork_after_authentication = 0;
1.505 deraadt 1832: if (daemon(1, 1) == -1)
1.344 djm 1833: fatal("daemon() failed: %.200s", strerror(errno));
1.537 djm 1834: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1835: error_f("stdfd_devnull failed");
1.344 djm 1836: }
1837:
1.523 djm 1838: static void
1839: forwarding_success(void)
1840: {
1.524 djm 1841: if (forward_confirms_pending == -1)
1842: return;
1843: if (--forward_confirms_pending == 0) {
1.540 djm 1844: debug_f("all expected forwarding replies received");
1.564 djm 1845: if (options.fork_after_authentication)
1.523 djm 1846: fork_postauth();
1.524 djm 1847: } else {
1.540 djm 1848: debug2_f("%d expected forwarding replies remaining",
1849: forward_confirms_pending);
1.523 djm 1850: }
1851: }
1852:
1.315 djm 1853: /* Callback for remote forward global requests */
1854: static void
1.463 djm 1855: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1856: {
1.406 millert 1857: struct Forward *rfwd = (struct Forward *)ctxt;
1.499 djm 1858: u_int port;
1859: int r;
1.315 djm 1860:
1.324 djm 1861: /* XXX verbose() on failure? */
1.404 markus 1862: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1863: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1864: rfwd->listen_path ? rfwd->listen_path :
1865: rfwd->listen_host ? rfwd->listen_host : "",
1866: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1867: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1868: rfwd->connect_host, rfwd->connect_port);
1869: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1870: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1.499 djm 1871: if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1.540 djm 1872: fatal_fr(r, "parse packet");
1.499 djm 1873: if (port > 65535) {
1874: error("Invalid allocated port %u for remote "
1875: "forward to %s:%d", port,
1876: rfwd->connect_host, rfwd->connect_port);
1877: /* Ensure failure processing runs below */
1878: type = SSH2_MSG_REQUEST_FAILURE;
1879: channel_update_permission(ssh,
1880: rfwd->handle, -1);
1881: } else {
1882: rfwd->allocated_port = (int)port;
1883: logit("Allocated port %u for remote "
1884: "forward to %s:%d",
1.569 dtucker 1885: rfwd->allocated_port, rfwd->connect_path ?
1886: rfwd->connect_path : rfwd->connect_host,
1.499 djm 1887: rfwd->connect_port);
1888: channel_update_permission(ssh,
1889: rfwd->handle, rfwd->allocated_port);
1890: }
1.366 markus 1891: } else {
1.480 djm 1892: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1893: }
1.324 djm 1894: }
1.468 djm 1895:
1.315 djm 1896: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1897: if (options.exit_on_forward_failure) {
1898: if (rfwd->listen_path != NULL)
1899: fatal("Error: remote port forwarding failed "
1900: "for listen path %s", rfwd->listen_path);
1901: else
1902: fatal("Error: remote port forwarding failed "
1903: "for listen port %d", rfwd->listen_port);
1904: } else {
1905: if (rfwd->listen_path != NULL)
1906: logit("Warning: remote port forwarding failed "
1907: "for listen path %s", rfwd->listen_path);
1908: else
1909: logit("Warning: remote port forwarding failed "
1910: "for listen port %d", rfwd->listen_port);
1911: }
1.315 djm 1912: }
1.523 djm 1913: forwarding_success();
1.315 djm 1914: }
1915:
1.126 itojun 1916: static void
1.582 djm 1917: client_cleanup_stdio_fwd(struct ssh *ssh, int id, int force, void *arg)
1.331 dtucker 1918: {
1919: debug("stdio forwarding: done");
1920: cleanup_exit(0);
1921: }
1922:
1.368 djm 1923: static void
1.463 djm 1924: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1925: {
1926: if (!success)
1927: fatal("stdio forwarding failed");
1928: }
1929:
1930: static void
1.523 djm 1931: ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
1932: {
1933: if (!success) {
1934: error("Tunnel forwarding failed");
1935: if (options.exit_on_forward_failure)
1936: cleanup_exit(255);
1937: }
1938:
1.540 djm 1939: debug_f("tunnel forward established, id=%d", id);
1.523 djm 1940: forwarding_success();
1941: }
1942:
1943: static void
1.463 djm 1944: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1945: {
1946: Channel *c;
1.332 djm 1947: int in, out;
1.331 dtucker 1948:
1.441 dtucker 1949: if (options.stdio_forward_host == NULL)
1.368 djm 1950: return;
1951:
1.540 djm 1952: debug3_f("%s:%d", options.stdio_forward_host,
1.441 dtucker 1953: options.stdio_forward_port);
1.332 djm 1954:
1.505 deraadt 1955: if ((in = dup(STDIN_FILENO)) == -1 ||
1956: (out = dup(STDOUT_FILENO)) == -1)
1.557 djm 1957: fatal_f("dup() in/out failed");
1.463 djm 1958: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.557 djm 1959: options.stdio_forward_port, in, out,
1960: CHANNEL_NONBLOCK_STDIO)) == NULL)
1.540 djm 1961: fatal_f("channel_connect_stdio_fwd failed");
1.463 djm 1962: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1963: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1964: }
1965:
1966: static void
1.551 markus 1967: ssh_init_forward_permissions(struct ssh *ssh, const char *what, char **opens,
1968: u_int num_opens)
1969: {
1970: u_int i;
1971: int port;
1.573 dtucker 1972: char *addr, *arg, *oarg;
1.551 markus 1973: int where = FORWARD_LOCAL;
1974:
1975: channel_clear_permission(ssh, FORWARD_ADM, where);
1976: if (num_opens == 0)
1977: return; /* permit any */
1978:
1979: /* handle keywords: "any" / "none" */
1980: if (num_opens == 1 && strcmp(opens[0], "any") == 0)
1981: return;
1982: if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
1983: channel_disable_admin(ssh, where);
1984: return;
1985: }
1986: /* Otherwise treat it as a list of permitted host:port */
1987: for (i = 0; i < num_opens; i++) {
1988: oarg = arg = xstrdup(opens[i]);
1.573 dtucker 1989: addr = hpdelim(&arg);
1990: if (addr == NULL)
1.551 markus 1991: fatal_f("missing host in %s", what);
1992: addr = cleanhostname(addr);
1993: if (arg == NULL || ((port = permitopen_port(arg)) < 0))
1994: fatal_f("bad port number in %s", what);
1995: /* Send it to channels layer */
1996: channel_add_permission(ssh, FORWARD_ADM,
1997: where, addr, port);
1998: free(oarg);
1999: }
2000: }
2001:
2002: static void
1.466 djm 2003: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 2004: {
1.86 markus 2005: int success = 0;
1.70 markus 2006: int i;
1.551 markus 2007:
2008: ssh_init_forward_permissions(ssh, "permitremoteopen",
2009: options.permitted_remote_opens,
2010: options.num_permitted_remote_opens);
1.331 dtucker 2011:
1.524 djm 2012: if (options.exit_on_forward_failure)
2013: forward_confirms_pending = 0; /* track pending requests */
1.70 markus 2014: /* Initiate local TCP/IP port forwardings. */
2015: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 2016: debug("Local connections to %.200s:%d forwarded to remote "
2017: "address %.200s:%d",
1.406 millert 2018: (options.local_forwards[i].listen_path != NULL) ?
2019: options.local_forwards[i].listen_path :
1.234 deraadt 2020: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 2021: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 2022: options.local_forwards[i].listen_host,
2023: options.local_forwards[i].listen_port,
1.406 millert 2024: (options.local_forwards[i].connect_path != NULL) ?
2025: options.local_forwards[i].connect_path :
1.232 djm 2026: options.local_forwards[i].connect_host,
2027: options.local_forwards[i].connect_port);
1.463 djm 2028: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 2029: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 2030: }
1.283 markus 2031: if (i > 0 && success != i && options.exit_on_forward_failure)
2032: fatal("Could not request local forwarding.");
1.86 markus 2033: if (i > 0 && success == 0)
2034: error("Could not request local forwarding.");
1.70 markus 2035:
2036: /* Initiate remote TCP/IP port forwardings. */
2037: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 2038: debug("Remote connections from %.200s:%d forwarded to "
2039: "local address %.200s:%d",
1.406 millert 2040: (options.remote_forwards[i].listen_path != NULL) ?
2041: options.remote_forwards[i].listen_path :
1.248 djm 2042: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 2043: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 2044: options.remote_forwards[i].listen_port,
1.406 millert 2045: (options.remote_forwards[i].connect_path != NULL) ?
2046: options.remote_forwards[i].connect_path :
1.232 djm 2047: options.remote_forwards[i].connect_host,
2048: options.remote_forwards[i].connect_port);
1.523 djm 2049: if ((options.remote_forwards[i].handle =
1.463 djm 2050: channel_request_remote_forwarding(ssh,
1.523 djm 2051: &options.remote_forwards[i])) >= 0) {
1.463 djm 2052: client_register_global_confirm(
2053: ssh_confirm_remote_forward,
1.366 markus 2054: &options.remote_forwards[i]);
1.523 djm 2055: forward_confirms_pending++;
2056: } else if (options.exit_on_forward_failure)
2057: fatal("Could not request remote forwarding.");
2058: else
2059: logit("Warning: Could not request remote forwarding.");
1.70 markus 2060: }
1.301 djm 2061:
2062: /* Initiate tunnel forwarding. */
2063: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 2064: if ((*ifname = client_request_tun_fwd(ssh,
2065: options.tun_open, options.tun_local,
1.523 djm 2066: options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
2067: forward_confirms_pending++;
2068: else if (options.exit_on_forward_failure)
2069: fatal("Could not request tunnel forwarding.");
2070: else
2071: error("Could not request tunnel forwarding.");
1.524 djm 2072: }
2073: if (forward_confirms_pending > 0) {
1.540 djm 2074: debug_f("expecting replies for %d forwards",
1.524 djm 2075: forward_confirms_pending);
1.468 djm 2076: }
1.70 markus 2077: }
2078:
1.126 itojun 2079: static void
1.70 markus 2080: check_agent_present(void)
2081: {
1.412 djm 2082: int r;
2083:
1.70 markus 2084: if (options.forward_agent) {
1.254 djm 2085: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 2086: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 2087: options.forward_agent = 0;
1.412 djm 2088: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.540 djm 2089: debug_r(r, "ssh_get_authentication_socket");
1.412 djm 2090: }
1.70 markus 2091: }
2092: }
2093:
1.214 djm 2094: static void
1.463 djm 2095: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 2096: {
1.215 djm 2097: extern char **environ;
1.558 djm 2098: const char *display, *term;
1.499 djm 2099: int r, interactive = tty_flag;
1.433 djm 2100: char *proto = NULL, *data = NULL;
1.337 djm 2101:
2102: if (!success)
1.580 djm 2103: return; /* No need for error message, channels code sends one */
1.215 djm 2104:
1.248 djm 2105: display = getenv("DISPLAY");
1.417 djm 2106: if (display == NULL && options.forward_x11)
2107: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 2108: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 2109: options.xauth_location, options.forward_x11_trusted,
2110: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 2111: /* Request forwarding with authentication spoofing. */
1.316 djm 2112: debug("Requesting X11 forwarding with authentication "
2113: "spoofing.");
1.463 djm 2114: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 2115: data, 1);
1.463 djm 2116: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 2117: /* XXX exit_on_forward_failure */
1.80 markus 2118: interactive = 1;
1.50 markus 2119: }
2120:
1.70 markus 2121: check_agent_present();
2122: if (options.forward_agent) {
2123: debug("Requesting authentication agent forwarding.");
1.463 djm 2124: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 2125: if ((r = sshpkt_send(ssh)) != 0)
1.540 djm 2126: fatal_fr(r, "send packet");
1.212 djm 2127: }
1.369 dtucker 2128:
2129: /* Tell the packet module whether this is an interactive session. */
1.499 djm 2130: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 2131: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 2132:
1.558 djm 2133: if ((term = lookup_env_in_list("TERM", options.setenv,
2134: options.num_setenv)) == NULL || *term == '\0')
2135: term = getenv("TERM");
1.562 djm 2136: client_session2_setup(ssh, id, tty_flag,
2137: options.session_type == SESSION_TYPE_SUBSYSTEM, term,
1.482 markus 2138: NULL, fileno(stdin), command, environ);
1.45 markus 2139: }
2140:
1.143 markus 2141: /* open new channel for a session */
1.126 itojun 2142: static int
1.463 djm 2143: ssh_session2_open(struct ssh *ssh)
1.45 markus 2144: {
1.118 markus 2145: Channel *c;
2146: int window, packetmax, in, out, err;
1.60 markus 2147:
1.563 djm 2148: if (options.stdin_null) {
1.93 itojun 2149: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 2150: } else {
2151: in = dup(STDIN_FILENO);
2152: }
1.60 markus 2153: out = dup(STDOUT_FILENO);
2154: err = dup(STDERR_FILENO);
1.45 markus 2155:
1.505 deraadt 2156: if (in == -1 || out == -1 || err == -1)
1.62 markus 2157: fatal("dup() in/out/err failed");
1.45 markus 2158:
1.65 markus 2159: window = CHAN_SES_WINDOW_DEFAULT;
2160: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 2161: if (tty_flag) {
2162: window >>= 1;
2163: packetmax >>= 1;
1.45 markus 2164: }
1.463 djm 2165: c = channel_new(ssh,
1.45 markus 2166: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 2167: window, packetmax, CHAN_EXTENDED_WRITE,
1.557 djm 2168: "client-session", CHANNEL_NONBLOCK_STDIO);
1.45 markus 2169:
1.540 djm 2170: debug3_f("channel_new: %d", c->self);
1.106 markus 2171:
1.463 djm 2172: channel_send_open(ssh, c->self);
1.560 djm 2173: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2174: channel_register_open_confirm(ssh, c->self,
1.310 djm 2175: ssh_session2_setup, NULL);
1.106 markus 2176:
1.118 markus 2177: return c->self;
1.106 markus 2178: }
2179:
1.126 itojun 2180: static int
1.544 djm 2181: ssh_session2(struct ssh *ssh, const struct ssh_conn_info *cinfo)
1.106 markus 2182: {
1.594 djm 2183: int r, interactive, id = -1;
1.466 djm 2184: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 2185:
2186: /* XXX should be pre-session */
1.368 djm 2187: if (!options.control_persist)
1.463 djm 2188: ssh_init_stdio_forwarding(ssh);
1.466 djm 2189:
2190: ssh_init_forwarding(ssh, &tun_fwd_ifname);
2191:
2192: if (options.local_command != NULL) {
2193: debug3("expanding LocalCommand: %s", options.local_command);
2194: cp = options.local_command;
2195: options.local_command = percent_expand(cp,
1.546 djm 2196: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.466 djm 2197: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2198: (char *)NULL);
2199: debug3("expanded LocalCommand: %s", options.local_command);
2200: free(cp);
2201: }
1.106 markus 2202:
1.344 djm 2203: /* Start listening for multiplex clients */
1.499 djm 2204: if (!ssh_packet_get_mux(ssh))
1.463 djm 2205: muxserver_listen(ssh);
1.344 djm 2206:
1.473 djm 2207: /*
1.368 djm 2208: * If we are in control persist mode and have a working mux listen
2209: * socket, then prepare to background ourselves and have a foreground
1.531 djm 2210: * client attach as a control client.
1.368 djm 2211: * NB. we must save copies of the flags that we override for
1.531 djm 2212: * the backgrounding, since we defer attachment of the client until
1.344 djm 2213: * after the connection is fully established (in particular,
2214: * async rfwd replies have been received for ExitOnForwardFailure).
2215: */
1.473 djm 2216: if (options.control_persist && muxserver_sock != -1) {
1.563 djm 2217: ostdin_null_flag = options.stdin_null;
1.560 djm 2218: osession_type = options.session_type;
1.359 djm 2219: orequest_tty = options.request_tty;
1.344 djm 2220: otty_flag = tty_flag;
1.593 djm 2221: ofork_after_authentication = options.fork_after_authentication;
1.563 djm 2222: options.stdin_null = 1;
1.560 djm 2223: options.session_type = SESSION_TYPE_NONE;
1.473 djm 2224: tty_flag = 0;
1.593 djm 2225: if ((osession_type != SESSION_TYPE_NONE ||
1.562 djm 2226: options.stdio_forward_host != NULL))
1.344 djm 2227: need_controlpersist_detach = 1;
1.564 djm 2228: options.fork_after_authentication = 1;
1.473 djm 2229: }
1.368 djm 2230: /*
2231: * ControlPersist mux listen socket setup failed, attempt the
2232: * stdio forward setup that we skipped earlier.
2233: */
2234: if (options.control_persist && muxserver_sock == -1)
1.463 djm 2235: ssh_init_stdio_forwarding(ssh);
1.344 djm 2236:
1.560 djm 2237: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2238: id = ssh_session2_open(ssh);
1.379 djm 2239: else {
1.594 djm 2240: interactive = options.control_master == SSHCTL_MASTER_NO;
2241: /* ControlPersist may have clobbered ControlMaster, so check */
2242: if (need_controlpersist_detach)
2243: interactive = otty_flag != 0;
2244: ssh_packet_set_interactive(ssh, interactive,
1.379 djm 2245: options.ip_qos_interactive, options.ip_qos_bulk);
2246: }
1.314 djm 2247:
2248: /* If we don't expect to open a new session, then disallow it */
1.319 markus 2249: if (options.control_master == SSHCTL_MASTER_NO &&
1.549 djm 2250: (ssh->compat & SSH_NEW_OPENSSH)) {
1.314 djm 2251: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 2252: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2253: (r = sshpkt_put_cstring(ssh,
2254: "no-more-sessions@openssh.com")) != 0 ||
2255: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2256: (r = sshpkt_send(ssh)) != 0)
1.540 djm 2257: fatal_fr(r, "send packet");
1.314 djm 2258: }
1.255 reyk 2259:
2260: /* Execute a local command */
2261: if (options.local_command != NULL &&
2262: options.permit_local_command)
2263: ssh_local_cmd(options.local_command);
1.467 djm 2264:
2265: /*
2266: * stdout is now owned by the session channel; clobber it here
2267: * so future channel closes are propagated to the local fd.
2268: * NB. this can only happen after LocalCommand has completed,
2269: * as it may want to write to stdout.
2270: */
1.537 djm 2271: if (!need_controlpersist_detach && stdfd_devnull(0, 1, 0) == -1)
1.540 djm 2272: error_f("stdfd_devnull failed");
1.301 djm 2273:
1.342 djm 2274: /*
2275: * If requested and we are not interested in replies to remote
2276: * forwarding requests, then let ssh continue in the background.
2277: */
1.564 djm 2278: if (options.fork_after_authentication) {
1.344 djm 2279: if (options.exit_on_forward_failure &&
2280: options.num_remote_forwards > 0) {
2281: debug("deferring postauth fork until remote forward "
2282: "confirmation received");
2283: } else
2284: fork_postauth();
1.318 djm 2285: }
1.31 markus 2286:
1.463 djm 2287: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2288: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2289: }
2290:
1.426 djm 2291: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2292: static void
1.544 djm 2293: load_public_identity_files(const struct ssh_conn_info *cinfo)
1.104 markus 2294: {
1.466 djm 2295: char *filename, *cp;
1.460 markus 2296: struct sshkey *public;
1.426 djm 2297: int i;
2298: u_int n_ids, n_certs;
1.335 djm 2299: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2300: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2301: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2302: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2303: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2304: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2305: #ifdef ENABLE_PKCS11
1.514 djm 2306: struct sshkey **keys = NULL;
2307: char **comments = NULL;
1.333 markus 2308: int nkeys;
1.335 djm 2309: #endif /* PKCS11 */
1.104 markus 2310:
1.426 djm 2311: n_ids = n_certs = 0;
1.398 tedu 2312: memset(identity_files, 0, sizeof(identity_files));
2313: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2314: memset(identity_file_userprovided, 0,
2315: sizeof(identity_file_userprovided));
1.426 djm 2316: memset(certificate_files, 0, sizeof(certificate_files));
2317: memset(certificates, 0, sizeof(certificates));
1.484 djm 2318: memset(certificate_file_userprovided, 0,
2319: sizeof(certificate_file_userprovided));
1.335 djm 2320:
2321: #ifdef ENABLE_PKCS11
1.333 markus 2322: if (options.pkcs11_provider != NULL &&
1.167 markus 2323: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2324: (pkcs11_init(!options.batch_mode) == 0) &&
2325: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1.514 djm 2326: &keys, &comments)) > 0) {
1.333 markus 2327: for (i = 0; i < nkeys; i++) {
1.335 djm 2328: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2329: sshkey_free(keys[i]);
1.514 djm 2330: free(comments[i]);
1.335 djm 2331: continue;
2332: }
2333: identity_keys[n_ids] = keys[i];
1.514 djm 2334: identity_files[n_ids] = comments[i]; /* transferred */
1.335 djm 2335: n_ids++;
1.167 markus 2336: }
1.378 djm 2337: free(keys);
1.514 djm 2338: free(comments);
1.127 markus 2339: }
1.333 markus 2340: #endif /* ENABLE_PKCS11 */
1.335 djm 2341: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2342: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2343: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2344: free(options.identity_files[i]);
1.426 djm 2345: options.identity_files[i] = NULL;
1.335 djm 2346: continue;
2347: }
1.490 dtucker 2348: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.544 djm 2349: filename = default_client_percent_dollar_expand(cp, cinfo);
1.378 djm 2350: free(cp);
1.483 markus 2351: check_load(sshkey_load_public(filename, &public, NULL),
1.576 djm 2352: &public, filename, "pubkey");
1.131 millert 2353: debug("identity file %s type %d", filename,
2354: public ? public->type : -1);
1.378 djm 2355: free(options.identity_files[i]);
1.335 djm 2356: identity_files[n_ids] = filename;
2357: identity_keys[n_ids] = public;
1.484 djm 2358: identity_file_userprovided[n_ids] =
2359: options.identity_file_userprovided[i];
1.335 djm 2360: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2361: continue;
2362:
1.426 djm 2363: /*
2364: * If no certificates have been explicitly listed then try
2365: * to add the default certificate variant too.
2366: */
2367: if (options.num_certificate_files != 0)
2368: continue;
1.335 djm 2369: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2370: check_load(sshkey_load_public(cp, &public, NULL),
1.576 djm 2371: &public, filename, "pubkey");
1.335 djm 2372: debug("identity file %s type %d", cp,
2373: public ? public->type : -1);
2374: if (public == NULL) {
1.378 djm 2375: free(cp);
1.335 djm 2376: continue;
2377: }
1.483 markus 2378: if (!sshkey_is_cert(public)) {
1.540 djm 2379: debug_f("key %s type %s is not a certificate",
2380: cp, sshkey_type(public));
1.483 markus 2381: sshkey_free(public);
1.378 djm 2382: free(cp);
1.335 djm 2383: continue;
2384: }
1.448 djm 2385: /* NB. leave filename pointing to private key */
2386: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2387: identity_keys[n_ids] = public;
1.484 djm 2388: identity_file_userprovided[n_ids] =
2389: options.identity_file_userprovided[i];
1.335 djm 2390: n_ids++;
2391: }
1.426 djm 2392:
2393: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
1.540 djm 2394: fatal_f("too many certificates");
1.426 djm 2395: for (i = 0; i < options.num_certificate_files; i++) {
2396: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2397: getuid());
1.544 djm 2398: filename = default_client_percent_dollar_expand(cp, cinfo);
1.426 djm 2399: free(cp);
2400:
1.483 markus 2401: check_load(sshkey_load_public(filename, &public, NULL),
1.576 djm 2402: &public, filename, "certificate");
1.426 djm 2403: debug("certificate file %s type %d", filename,
2404: public ? public->type : -1);
2405: free(options.certificate_files[i]);
2406: options.certificate_files[i] = NULL;
2407: if (public == NULL) {
2408: free(filename);
2409: continue;
2410: }
1.483 markus 2411: if (!sshkey_is_cert(public)) {
1.540 djm 2412: debug_f("key %s type %s is not a certificate",
2413: filename, sshkey_type(public));
1.483 markus 2414: sshkey_free(public);
1.426 djm 2415: free(filename);
2416: continue;
2417: }
2418: certificate_files[n_certs] = filename;
2419: certificates[n_certs] = public;
1.484 djm 2420: certificate_file_userprovided[n_certs] =
2421: options.certificate_file_userprovided[i];
1.426 djm 2422: ++n_certs;
2423: }
2424:
1.335 djm 2425: options.num_identity_files = n_ids;
2426: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2427: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2428: memcpy(options.identity_file_userprovided,
2429: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2430:
2431: options.num_certificate_files = n_certs;
2432: memcpy(options.certificate_files,
2433: certificate_files, sizeof(certificate_files));
2434: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2435: memcpy(options.certificate_file_userprovided,
2436: certificate_file_userprovided,
2437: sizeof(certificate_file_userprovided));
1.214 djm 2438: }
1.352 djm 2439:
2440: static void
2441: main_sigchld_handler(int sig)
2442: {
2443: int save_errno = errno;
2444: pid_t pid;
2445: int status;
2446:
2447: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2448: (pid == -1 && errno == EINTR))
1.352 djm 2449: ;
2450: errno = save_errno;
2451: }
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