Annotation of src/usr.bin/ssh/ssh.c, Revision 1.596
1.596 ! djm 1: /* $OpenBSD: ssh.c,v 1.595 2023/10/11 22:42:26 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);
609: free(cinfo);
610: }
611:
1.400 djm 612: /*
1.32 deraadt 613: * Main program for the ssh client.
614: */
1.2 provos 615: int
616: main(int ac, char **av)
1.1 deraadt 617: {
1.437 djm 618: struct ssh *ssh = NULL;
1.462 djm 619: int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
1.496 djm 620: int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
1.583 dtucker 621: char *p, *cp, *line, *argv0, *logfile;
1.544 djm 622: char cname[NI_MAXHOST], thishost[NI_MAXHOST];
1.31 markus 623: struct stat st;
1.98 markus 624: struct passwd *pw;
1.144 stevesk 625: extern int optind, optreset;
626: extern char *optarg;
1.406 millert 627: struct Forward fwd;
1.385 djm 628: struct addrinfo *addrs = NULL;
1.513 dtucker 629: size_t n, len;
1.532 dtucker 630: u_int j;
1.544 djm 631: struct ssh_conn_info *cinfo = NULL;
1.250 djm 632:
633: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
634: sanitise_stdfd();
1.31 markus 635:
1.33 markus 636: /*
1.346 djm 637: * Discard other fds that are hanging around. These can cause problem
638: * with backgrounded ssh processes started by ControlPersist.
639: */
640: closefrom(STDERR_FILENO + 1);
641:
1.487 dtucker 642: if (getuid() != geteuid())
643: fatal("ssh setuid not supported.");
644: if (getgid() != getegid())
645: fatal("ssh setgid not supported.");
1.184 stevesk 646:
1.107 markus 647: /* Get user data. */
1.490 dtucker 648: pw = getpwuid(getuid());
1.107 markus 649: if (!pw) {
1.490 dtucker 650: logit("No user exists for uid %lu", (u_long)getuid());
1.257 dtucker 651: exit(255);
1.107 markus 652: }
653: /* Take a copy of the returned structure. */
654: pw = pwcopy(pw);
1.31 markus 655:
1.33 markus 656: /*
657: * Set our umask to something reasonable, as some files are created
658: * with the default umask. This will make them world-readable but
659: * writable only by the owner, which is ok for all files for which we
660: * don't set the modes explicitly.
661: */
1.577 djm 662: umask(022 | umask(077));
1.445 djm 663:
664: setlocale(LC_CTYPE, "");
1.31 markus 665:
1.316 djm 666: /*
667: * Initialize option structure to indicate that no values have been
668: * set.
669: */
1.31 markus 670: initialize_options(&options);
671:
1.463 djm 672: /*
673: * Prepare main ssh transport/connection structures
674: */
675: if ((ssh = ssh_alloc_session_state()) == NULL)
676: fatal("Couldn't allocate session state");
677: channel_init_channels(ssh);
678:
1.31 markus 679: /* Parse command-line arguments. */
680: host = NULL;
1.320 djm 681: use_syslog = 0;
1.375 dtucker 682: logfile = NULL;
1.325 markus 683: argv0 = av[0];
1.31 markus 684:
1.266 djm 685: again:
1.316 djm 686: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.591 djm 687: "AB:CD:E:F:GI:J:KL:MNO:P:Q:R:S:TVw:W:XYy")) != -1) { /* HUZdhjruz */
1.31 markus 688: switch (opt) {
1.91 jakob 689: case '1':
1.454 djm 690: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 691: break;
1.47 markus 692: case '2':
1.454 djm 693: /* Ignored */
1.47 markus 694: break;
1.37 markus 695: case '4':
1.196 djm 696: options.address_family = AF_INET;
1.37 markus 697: break;
698: case '6':
1.196 djm 699: options.address_family = AF_INET6;
1.37 markus 700: break;
1.31 markus 701: case 'n':
1.563 djm 702: options.stdin_null = 1;
1.31 markus 703: break;
704: case 'f':
1.564 djm 705: options.fork_after_authentication = 1;
1.563 djm 706: options.stdin_null = 1;
1.31 markus 707: break;
708: case 'x':
709: options.forward_x11 = 0;
710: break;
711: case 'X':
712: options.forward_x11 = 1;
713: break;
1.320 djm 714: case 'y':
715: use_syslog = 1;
716: break;
1.375 dtucker 717: case 'E':
1.422 dtucker 718: logfile = optarg;
1.375 dtucker 719: break;
1.408 djm 720: case 'G':
721: config_test = 1;
722: break;
1.202 markus 723: case 'Y':
724: options.forward_x11 = 1;
725: options.forward_x11_trusted = 1;
726: break;
1.31 markus 727: case 'g':
1.406 millert 728: options.fwd_opts.gateway_ports = 1;
1.31 markus 729: break;
1.229 djm 730: case 'O':
1.441 dtucker 731: if (options.stdio_forward_host != NULL)
1.332 djm 732: fatal("Cannot specify multiplexing "
733: "command with -W");
734: else if (muxclient_command != 0)
735: fatal("Multiplexing command already specified");
1.229 djm 736: if (strcmp(optarg, "check") == 0)
1.312 djm 737: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 738: else if (strcmp(optarg, "forward") == 0)
739: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 740: else if (strcmp(optarg, "exit") == 0)
1.312 djm 741: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 742: else if (strcmp(optarg, "stop") == 0)
743: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 744: else if (strcmp(optarg, "cancel") == 0)
745: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 746: else if (strcmp(optarg, "proxy") == 0)
747: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 748: else
749: fatal("Invalid multiplex command.");
750: break;
1.591 djm 751: case 'P':
752: if (options.tag == NULL)
753: options.tag = xstrdup(optarg);
1.376 djm 754: break;
1.394 deraadt 755: case 'Q':
1.376 djm 756: cp = NULL;
1.519 dtucker 757: if (strcmp(optarg, "cipher") == 0 ||
758: strcasecmp(optarg, "Ciphers") == 0)
1.393 djm 759: cp = cipher_alg_list('\n', 0);
1.394 deraadt 760: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 761: cp = cipher_alg_list('\n', 1);
1.519 dtucker 762: else if (strcmp(optarg, "mac") == 0 ||
763: strcasecmp(optarg, "MACs") == 0)
1.392 dtucker 764: cp = mac_alg_list('\n');
1.519 dtucker 765: else if (strcmp(optarg, "kex") == 0 ||
766: strcasecmp(optarg, "KexAlgorithms") == 0)
1.392 dtucker 767: cp = kex_alg_list('\n');
1.394 deraadt 768: else if (strcmp(optarg, "key") == 0)
1.451 djm 769: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 770: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 771: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 772: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 773: cp = sshkey_alg_list(0, 1, 0, '\n');
1.589 djm 774: else if (strcmp(optarg, "key-ca-sign") == 0 ||
775: strcasecmp(optarg, "CASignatureAlgorithms") == 0)
776: cp = sshkey_alg_list(0, 1, 1, '\n');
1.519 dtucker 777: else if (strcmp(optarg, "key-sig") == 0 ||
1.547 dtucker 778: strcasecmp(optarg, "PubkeyAcceptedKeyTypes") == 0 || /* deprecated name */
779: strcasecmp(optarg, "PubkeyAcceptedAlgorithms") == 0 ||
1.519 dtucker 780: strcasecmp(optarg, "HostKeyAlgorithms") == 0 ||
1.548 dtucker 781: strcasecmp(optarg, "HostbasedKeyTypes") == 0 || /* deprecated name */
782: strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 0 || /* deprecated name */
783: strcasecmp(optarg, "HostbasedAcceptedAlgorithms") == 0)
1.519 dtucker 784: cp = sshkey_alg_list(0, 0, 1, '\n');
1.491 djm 785: else if (strcmp(optarg, "sig") == 0)
1.492 djm 786: cp = sshkey_alg_list(0, 1, 1, '\n');
1.491 djm 787: else if (strcmp(optarg, "protocol-version") == 0)
1.416 djm 788: cp = xstrdup("2");
1.513 dtucker 789: else if (strcmp(optarg, "compression") == 0) {
790: cp = xstrdup(compression_alg_list(0));
791: len = strlen(cp);
792: for (n = 0; n < len; n++)
793: if (cp[n] == ',')
794: cp[n] = '\n';
795: } else if (strcmp(optarg, "help") == 0) {
1.491 djm 796: cp = xstrdup(
1.513 dtucker 797: "cipher\ncipher-auth\ncompression\nkex\n"
1.519 dtucker 798: "key\nkey-cert\nkey-plain\nkey-sig\nmac\n"
1.491 djm 799: "protocol-version\nsig");
1.416 djm 800: }
1.376 djm 801: if (cp == NULL)
802: fatal("Unsupported query \"%s\"", optarg);
803: printf("%s\n", cp);
804: free(cp);
805: exit(0);
1.31 markus 806: break;
807: case 'a':
808: options.forward_agent = 0;
1.53 markus 809: break;
810: case 'A':
811: options.forward_agent = 1;
1.31 markus 812: break;
813: case 'k':
1.204 dtucker 814: options.gss_deleg_creds = 0;
1.297 djm 815: break;
816: case 'K':
817: options.gss_authentication = 1;
818: options.gss_deleg_creds = 1;
1.31 markus 819: break;
820: case 'i':
1.490 dtucker 821: p = tilde_expand_filename(optarg, getuid());
1.505 deraadt 822: if (stat(p, &st) == -1)
1.128 fgsch 823: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 824: "not accessible: %s.\n", p,
1.231 otto 825: strerror(errno));
1.429 dtucker 826: else
827: add_identity_file(&options, NULL, p, 1);
828: free(p);
1.31 markus 829: break;
1.127 markus 830: case 'I':
1.333 markus 831: #ifdef ENABLE_PKCS11
1.422 dtucker 832: free(options.pkcs11_provider);
1.333 markus 833: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 834: #else
1.333 markus 835: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 836: #endif
1.127 markus 837: break;
1.443 djm 838: case 'J':
1.504 djm 839: if (options.jump_host != NULL) {
840: fatal("Only a single -J option is permitted "
841: "(use commas to separate multiple "
842: "jump hops)");
843: }
1.443 djm 844: if (options.proxy_command != NULL)
845: fatal("Cannot specify -J with ProxyCommand");
846: if (parse_jump(optarg, &options, 1) == -1)
847: fatal("Invalid -J argument");
848: options.proxy_command = xstrdup("none");
849: break;
1.31 markus 850: case 't':
1.359 djm 851: if (options.request_tty == REQUEST_TTY_YES)
852: options.request_tty = REQUEST_TTY_FORCE;
853: else
854: options.request_tty = REQUEST_TTY_YES;
1.31 markus 855: break;
856: case 'v':
1.197 markus 857: if (debug_flag == 0) {
1.66 markus 858: debug_flag = 1;
859: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 860: } else {
1.443 djm 861: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
862: debug_flag++;
1.197 markus 863: options.log_level++;
1.443 djm 864: }
1.197 markus 865: }
1.375 dtucker 866: break;
1.31 markus 867: case 'V':
1.209 markus 868: fprintf(stderr, "%s, %s\n",
1.541 dtucker 869: SSH_VERSION, SSH_OPENSSL_VERSION);
1.584 millert 870: exit(0);
1.31 markus 871: break;
1.255 reyk 872: case 'w':
1.256 reyk 873: if (options.tun_open == -1)
874: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 875: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 876: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 877: fprintf(stderr,
878: "Bad tun device '%s'\n", optarg);
1.257 dtucker 879: exit(255);
1.255 reyk 880: }
881: break;
1.331 dtucker 882: case 'W':
1.441 dtucker 883: if (options.stdio_forward_host != NULL)
1.332 djm 884: fatal("stdio forward already specified");
885: if (muxclient_command != 0)
886: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 887: if (parse_forward(&fwd, optarg, 1, 0)) {
1.590 dlg 888: options.stdio_forward_host =
889: fwd.listen_port == PORT_STREAMLOCAL ?
890: fwd.listen_path : fwd.listen_host;
1.441 dtucker 891: options.stdio_forward_port = fwd.listen_port;
1.378 djm 892: free(fwd.connect_host);
1.331 dtucker 893: } else {
894: fprintf(stderr,
895: "Bad stdio forwarding specification '%s'\n",
896: optarg);
897: exit(255);
898: }
1.359 djm 899: options.request_tty = REQUEST_TTY_NO;
1.560 djm 900: options.session_type = SESSION_TYPE_NONE;
1.331 dtucker 901: break;
1.31 markus 902: case 'q':
903: options.log_level = SYSLOG_LEVEL_QUIET;
904: break;
905: case 'e':
906: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 907: (u_char) optarg[1] >= 64 &&
908: (u_char) optarg[1] < 128)
1.78 markus 909: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 910: else if (strlen(optarg) == 1)
1.78 markus 911: options.escape_char = (u_char) optarg[0];
1.31 markus 912: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 913: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 914: else {
1.128 fgsch 915: fprintf(stderr, "Bad escape character '%s'.\n",
916: optarg);
1.257 dtucker 917: exit(255);
1.31 markus 918: }
919: break;
920: case 'c':
1.506 naddy 921: if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
1.420 djm 922: optarg + 1 : optarg)) {
923: fprintf(stderr, "Unknown cipher type '%s'\n",
924: optarg);
925: exit(255);
1.95 markus 926: }
1.456 djm 927: free(options.ciphers);
928: options.ciphers = xstrdup(optarg);
1.95 markus 929: break;
930: case 'm':
1.422 dtucker 931: if (mac_valid(optarg)) {
932: free(options.macs);
1.95 markus 933: options.macs = xstrdup(optarg);
1.422 dtucker 934: } else {
1.128 fgsch 935: fprintf(stderr, "Unknown mac type '%s'\n",
936: optarg);
1.257 dtucker 937: exit(255);
1.31 markus 938: }
939: break;
1.214 djm 940: case 'M':
1.242 djm 941: if (options.control_master == SSHCTL_MASTER_YES)
942: options.control_master = SSHCTL_MASTER_ASK;
943: else
944: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 945: break;
1.31 markus 946: case 'p':
1.465 millert 947: if (options.port == -1) {
948: options.port = a2port(optarg);
949: if (options.port <= 0) {
950: fprintf(stderr, "Bad port '%s'\n",
951: optarg);
952: exit(255);
953: }
1.109 markus 954: }
1.31 markus 955: break;
956: case 'l':
1.465 millert 957: if (options.user == NULL)
958: options.user = optarg;
1.31 markus 959: break;
1.141 stevesk 960:
961: case 'L':
1.324 djm 962: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 963: add_local_forward(&options, &fwd);
964: else {
1.128 fgsch 965: fprintf(stderr,
1.232 djm 966: "Bad local forwarding specification '%s'\n",
1.128 fgsch 967: optarg);
1.257 dtucker 968: exit(255);
1.31 markus 969: }
1.232 djm 970: break;
971:
972: case 'R':
1.464 markus 973: if (parse_forward(&fwd, optarg, 0, 1) ||
974: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 975: add_remote_forward(&options, &fwd);
976: } else {
1.128 fgsch 977: fprintf(stderr,
1.232 djm 978: "Bad remote forwarding specification "
979: "'%s'\n", optarg);
1.257 dtucker 980: exit(255);
1.31 markus 981: }
982: break;
1.108 markus 983:
984: case 'D':
1.324 djm 985: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 986: add_local_forward(&options, &fwd);
1.232 djm 987: } else {
1.322 stevesk 988: fprintf(stderr,
989: "Bad dynamic forwarding specification "
990: "'%s'\n", optarg);
1.257 dtucker 991: exit(255);
1.109 markus 992: }
1.108 markus 993: break;
994:
1.31 markus 995: case 'C':
1.513 dtucker 996: #ifdef WITH_ZLIB
1.31 markus 997: options.compression = 1;
1.513 dtucker 998: #else
999: error("Compression not supported, disabling.");
1000: #endif
1.31 markus 1001: break;
1.45 markus 1002: case 'N':
1.560 djm 1003: if (options.session_type != -1 &&
1004: options.session_type != SESSION_TYPE_NONE)
1005: fatal("Cannot specify -N with -s/SessionType");
1006: options.session_type = SESSION_TYPE_NONE;
1.359 djm 1007: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1008: break;
1009: case 'T':
1.359 djm 1010: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1011: break;
1.31 markus 1012: case 'o':
1.205 markus 1013: line = xstrdup(optarg);
1.408 djm 1014: if (process_config_line(&options, pw,
1015: host ? host : "", host ? host : "", line,
1016: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 1017: exit(255);
1.378 djm 1018: free(line);
1.31 markus 1019: break;
1.85 djm 1020: case 's':
1.560 djm 1021: if (options.session_type != -1 &&
1022: options.session_type != SESSION_TYPE_SUBSYSTEM)
1023: fatal("Cannot specify -s with -N/SessionType");
1024: options.session_type = SESSION_TYPE_SUBSYSTEM;
1.117 markus 1025: break;
1.214 djm 1026: case 'S':
1.431 mmcc 1027: free(options.control_path);
1.214 djm 1028: options.control_path = xstrdup(optarg);
1029: break;
1.117 markus 1030: case 'b':
1031: options.bind_address = optarg;
1.474 djm 1032: break;
1033: case 'B':
1034: options.bind_interface = optarg;
1.85 djm 1035: break;
1.139 markus 1036: case 'F':
1037: config = optarg;
1038: break;
1.31 markus 1039: default:
1040: usage();
1.1 deraadt 1041: }
1.31 markus 1042: }
1043:
1.462 djm 1044: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
1045: opt_terminated = 1;
1046:
1.128 fgsch 1047: ac -= optind;
1048: av += optind;
1049:
1.329 guenther 1050: if (ac > 0 && !host) {
1.465 millert 1051: int tport;
1052: char *tuser;
1053: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
1054: case -1:
1055: usage();
1056: break;
1057: case 0:
1058: if (options.user == NULL) {
1059: options.user = tuser;
1060: tuser = NULL;
1061: }
1062: free(tuser);
1063: if (options.port == -1 && tport != -1)
1064: options.port = tport;
1065: break;
1066: default:
1.128 fgsch 1067: p = xstrdup(*av);
1.188 markus 1068: cp = strrchr(p, '@');
1.465 millert 1069: if (cp != NULL) {
1070: if (cp == p)
1071: usage();
1072: if (options.user == NULL) {
1073: options.user = p;
1074: p = NULL;
1075: }
1076: *cp++ = '\0';
1077: host = xstrdup(cp);
1078: free(p);
1079: } else
1080: host = p;
1081: break;
1082: }
1.462 djm 1083: if (ac > 1 && !opt_terminated) {
1.189 millert 1084: optind = optreset = 1;
1.128 fgsch 1085: goto again;
1086: }
1.189 millert 1087: ac--, av++;
1.128 fgsch 1088: }
1089:
1.31 markus 1090: /* Check that we got a host name. */
1091: if (!host)
1092: usage();
1093:
1.583 dtucker 1094: options.host_arg = xstrdup(host);
1.385 djm 1095:
1.402 markus 1096: #ifdef WITH_OPENSSL
1.350 djm 1097: OpenSSL_add_all_algorithms();
1.72 markus 1098: ERR_load_crypto_strings();
1.402 markus 1099: #endif
1.31 markus 1100:
1101: /* Initialize the command to execute on remote host. */
1.482 markus 1102: if ((command = sshbuf_new()) == NULL)
1103: fatal("sshbuf_new failed");
1.1 deraadt 1104:
1.33 markus 1105: /*
1106: * Save the command to execute on the remote host in a buffer. There
1107: * is no limit on the length of the command, except by the maximum
1108: * packet size. Also sets the tty flag if there is no command.
1109: */
1.128 fgsch 1110: if (!ac) {
1.31 markus 1111: /* No command specified - execute shell on a tty. */
1.560 djm 1112: if (options.session_type == SESSION_TYPE_SUBSYSTEM) {
1.128 fgsch 1113: fprintf(stderr,
1114: "You must specify a subsystem to invoke.\n");
1.85 djm 1115: usage();
1116: }
1.31 markus 1117: } else {
1.128 fgsch 1118: /* A command has been specified. Store it into the buffer. */
1119: for (i = 0; i < ac; i++) {
1.482 markus 1120: if ((r = sshbuf_putf(command, "%s%s",
1121: i ? " " : "", av[i])) != 0)
1.540 djm 1122: fatal_fr(r, "buffer error");
1.31 markus 1123: }
1124: }
1125:
1.575 djm 1126: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1127:
1.101 markus 1128: /*
1129: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1130: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1131: */
1.375 dtucker 1132: if (use_syslog && logfile != NULL)
1133: fatal("Can't specify both -y and -E");
1.422 dtucker 1134: if (logfile != NULL)
1.375 dtucker 1135: log_redirect_stderr_to(logfile);
1.325 markus 1136: log_init(argv0,
1.468 djm 1137: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1138: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1139: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1140: SYSLOG_FACILITY_USER : options.log_facility,
1141: !use_syslog);
1.375 dtucker 1142:
1143: if (debug_flag)
1.541 dtucker 1144: logit("%s, %s", SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 1145:
1.400 djm 1146: /* Parse the configuration files */
1.583 dtucker 1147: process_config_files(options.host_arg, pw, 0, &want_final_pass);
1.496 djm 1148: if (want_final_pass)
1149: debug("configuration requests final Match pass");
1.400 djm 1150:
1151: /* Hostname canonicalisation needs a few options filled. */
1152: fill_default_options_for_canonicalization(&options);
1153:
1154: /* If the user has replaced the hostname then take it into use now */
1155: if (options.hostname != NULL) {
1156: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1157: cp = percent_expand(options.hostname,
1158: "h", host, (char *)NULL);
1159: free(host);
1160: host = cp;
1.408 djm 1161: free(options.hostname);
1162: options.hostname = xstrdup(host);
1.400 djm 1163: }
1164:
1.470 djm 1165: /* Don't lowercase addresses, they will be explicitly canonicalised */
1166: if ((was_addr = is_addr(host)) == 0)
1167: lowercase(host);
1168:
1169: /*
1170: * Try to canonicalize if requested by configuration or the
1171: * hostname is an address.
1172: */
1173: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1174: addrs = resolve_canonicalize(&host, options.port);
1175:
1.139 markus 1176: /*
1.401 djm 1177: * If CanonicalizePermittedCNAMEs have been specified but
1178: * other canonicalization did not happen (by not being requested
1179: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1180: * as a result of CNAME following.
1.401 djm 1181: *
1182: * Try to resolve the bare hostname name using the system resolver's
1183: * usual search rules and then apply the CNAME follow rules.
1184: *
1185: * Skip the lookup if a ProxyCommand is being used unless the user
1186: * has specifically requested canonicalisation for this case via
1187: * CanonicalizeHostname=always
1.139 markus 1188: */
1.443 djm 1189: direct = option_clear_or_none(options.proxy_command) &&
1.588 djm 1190: option_clear_or_none(options.jump_host);
1.568 djm 1191: if (addrs == NULL && config_has_permitted_cnames(&options) && (direct ||
1.443 djm 1192: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1193: if ((addrs = resolve_host(host, options.port,
1.493 djm 1194: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1195: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1196: if (direct)
1.403 djm 1197: cleanup_exit(255); /* logged in resolve_host */
1198: } else
1.443 djm 1199: check_follow_cname(direct, &host, cname);
1.400 djm 1200: }
1.139 markus 1201:
1.400 djm 1202: /*
1.408 djm 1203: * If canonicalisation is enabled then re-parse the configuration
1204: * files as new stanzas may match.
1.400 djm 1205: */
1.496 djm 1206: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1207: debug("hostname canonicalisation enabled, "
1208: "will re-parse configuration");
1209: want_final_pass = 1;
1210: }
1211:
1212: if (want_final_pass) {
1213: debug("re-parsing configuration");
1.408 djm 1214: free(options.hostname);
1215: options.hostname = xstrdup(host);
1.583 dtucker 1216: process_config_files(options.host_arg, pw, 1, NULL);
1.408 djm 1217: /*
1218: * Address resolution happens early with canonicalisation
1219: * enabled and the port number may have changed since, so
1220: * reset it in address list
1221: */
1222: if (addrs != NULL && options.port > 0)
1223: set_addrinfo_port(addrs, options.port);
1.139 markus 1224: }
1.31 markus 1225:
1226: /* Fill configuration defaults. */
1.543 djm 1227: if (fill_default_options(&options) != 0)
1228: cleanup_exit(255);
1.443 djm 1229:
1.534 dtucker 1230: if (options.user == NULL)
1231: options.user = xstrdup(pw->pw_name);
1232:
1.443 djm 1233: /*
1234: * If ProxyJump option specified, then construct a ProxyCommand now.
1235: */
1236: if (options.jump_host != NULL) {
1237: char port_s[8];
1.534 dtucker 1238: const char *jumpuser = options.jump_user, *sshbin = argv0;
1.520 dtucker 1239: int port = options.port, jumpport = options.jump_port;
1240:
1241: if (port <= 0)
1242: port = default_ssh_port();
1243: if (jumpport <= 0)
1244: jumpport = default_ssh_port();
1.534 dtucker 1245: if (jumpuser == NULL)
1246: jumpuser = options.user;
1247: if (strcmp(options.jump_host, host) == 0 && port == jumpport &&
1248: strcmp(options.user, jumpuser) == 0)
1.520 dtucker 1249: fatal("jumphost loop via %s", options.jump_host);
1.478 djm 1250:
1251: /*
1252: * Try to use SSH indicated by argv[0], but fall back to
1253: * "ssh" if it appears unavailable.
1254: */
1255: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1256: sshbin = "ssh";
1.443 djm 1257:
1258: /* Consistency check */
1259: if (options.proxy_command != NULL)
1260: fatal("inconsistent options: ProxyCommand+ProxyJump");
1261: /* Never use FD passing for ProxyJump */
1262: options.proxy_use_fdpass = 0;
1263: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1264: xasprintf(&options.proxy_command,
1.478 djm 1265: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1266: sshbin,
1.443 djm 1267: /* Optional "-l user" argument if jump_user set */
1268: options.jump_user == NULL ? "" : " -l ",
1269: options.jump_user == NULL ? "" : options.jump_user,
1270: /* Optional "-p port" argument if jump_port set */
1271: options.jump_port <= 0 ? "" : " -p ",
1272: options.jump_port <= 0 ? "" : port_s,
1273: /* Optional additional jump hosts ",..." */
1274: options.jump_extra == NULL ? "" : " -J ",
1275: options.jump_extra == NULL ? "" : options.jump_extra,
1.571 jsg 1276: /* Optional "-F" argument if -F specified */
1.443 djm 1277: config == NULL ? "" : " -F ",
1278: config == NULL ? "" : config,
1279: /* Optional "-v" arguments if -v set */
1280: debug_flag ? " -" : "",
1281: debug_flag, "vvv",
1282: /* Mandatory hostname */
1283: options.jump_host);
1284: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1285: options.proxy_command);
1286: }
1.31 markus 1287:
1.400 djm 1288: if (options.port == 0)
1289: options.port = default_ssh_port();
1.463 djm 1290: channel_set_af(ssh, options.address_family);
1.196 djm 1291:
1.383 djm 1292: /* Tidy and check options */
1293: if (options.host_key_alias != NULL)
1294: lowercase(options.host_key_alias);
1295: if (options.proxy_command != NULL &&
1296: strcmp(options.proxy_command, "-") == 0 &&
1297: options.proxy_use_fdpass)
1298: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.516 markus 1299: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1300: if (options.control_persist && options.control_path != NULL) {
1301: debug("UpdateHostKeys=ask is incompatible with "
1302: "ControlPersist; disabling");
1303: options.update_hostkeys = 0;
1304: } else if (sshbuf_len(command) != 0 ||
1305: options.remote_command != NULL ||
1306: options.request_tty == REQUEST_TTY_NO) {
1307: debug("UpdateHostKeys=ask is incompatible with "
1308: "remote command execution; disabling");
1.517 djm 1309: options.update_hostkeys = 0;
1310: } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1311: /* no point logging anything; user won't see it */
1.516 markus 1312: options.update_hostkeys = 0;
1313: }
1.415 djm 1314: }
1.430 djm 1315: if (options.connection_attempts <= 0)
1316: fatal("Invalid number of ConnectionAttempts");
1317:
1.482 markus 1318: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1319: fatal("Cannot execute command-line and remote command.");
1320:
1321: /* Cannot fork to background if no command. */
1.564 djm 1322: if (options.fork_after_authentication && sshbuf_len(command) == 0 &&
1.562 djm 1323: options.remote_command == NULL &&
1324: options.session_type != SESSION_TYPE_NONE)
1.461 bluhm 1325: fatal("Cannot fork into background without a command "
1326: "to execute.");
1327:
1.31 markus 1328: /* reinit */
1.452 dtucker 1329: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.559 djm 1330: for (j = 0; j < options.num_log_verbose; j++) {
1331: if (strcasecmp(options.log_verbose[j], "none") == 0)
1332: break;
1.539 djm 1333: log_verbose_add(options.log_verbose[j]);
1.559 djm 1334: }
1.370 djm 1335:
1336: if (options.request_tty == REQUEST_TTY_YES ||
1337: options.request_tty == REQUEST_TTY_FORCE)
1338: tty_flag = 1;
1339:
1340: /* Allocate a tty by default if no command specified. */
1.482 markus 1341: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1342: tty_flag = options.request_tty != REQUEST_TTY_NO;
1343:
1344: /* Force no tty */
1.447 markus 1345: if (options.request_tty == REQUEST_TTY_NO ||
1.570 djm 1346: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY) ||
1347: options.session_type == SESSION_TYPE_NONE)
1.370 djm 1348: tty_flag = 0;
1349: /* Do not allocate a tty if stdin is not a tty. */
1.563 djm 1350: if ((!isatty(fileno(stdin)) || options.stdin_null) &&
1.370 djm 1351: options.request_tty != REQUEST_TTY_FORCE) {
1352: if (tty_flag)
1353: logit("Pseudo-terminal will not be allocated because "
1354: "stdin is not a terminal.");
1355: tty_flag = 0;
1356: }
1.343 djm 1357:
1.466 djm 1358: /* Set up strings used to percent_expand() arguments */
1.544 djm 1359: cinfo = xcalloc(1, sizeof(*cinfo));
1.358 djm 1360: if (gethostname(thishost, sizeof(thishost)) == -1)
1361: fatal("gethostname: %s", strerror(errno));
1.544 djm 1362: cinfo->thishost = xstrdup(thishost);
1363: thishost[strcspn(thishost, ".")] = '\0';
1364: cinfo->shorthost = xstrdup(thishost);
1365: xasprintf(&cinfo->portstr, "%d", options.port);
1366: xasprintf(&cinfo->uidstr, "%llu",
1.479 djm 1367: (unsigned long long)pw->pw_uid);
1.544 djm 1368: cinfo->keyalias = xstrdup(options.host_key_alias ?
1.583 dtucker 1369: options.host_key_alias : options.host_arg);
1.544 djm 1370: cinfo->conn_hash_hex = ssh_connection_hash(cinfo->thishost, host,
1371: cinfo->portstr, options.user);
1.583 dtucker 1372: cinfo->host_arg = xstrdup(options.host_arg);
1.544 djm 1373: cinfo->remhost = xstrdup(host);
1374: cinfo->remuser = xstrdup(options.user);
1375: cinfo->homedir = xstrdup(pw->pw_dir);
1376: cinfo->locuser = xstrdup(pw->pw_name);
1.405 djm 1377:
1.466 djm 1378: /*
1379: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1380: * after port-forwarding is set up, so it may pick up any local
1381: * tunnel interface name allocated.
1382: */
1.461 bluhm 1383: if (options.remote_command != NULL) {
1384: debug3("expanding RemoteCommand: %s", options.remote_command);
1385: cp = options.remote_command;
1.527 dtucker 1386: options.remote_command = default_client_percent_expand(cp,
1.544 djm 1387: cinfo);
1.461 bluhm 1388: debug3("expanded RemoteCommand: %s", options.remote_command);
1389: free(cp);
1.482 markus 1390: if ((r = sshbuf_put(command, options.remote_command,
1391: strlen(options.remote_command))) != 0)
1.540 djm 1392: fatal_fr(r, "buffer error");
1.304 dtucker 1393: }
1.31 markus 1394:
1.214 djm 1395: if (options.control_path != NULL) {
1.490 dtucker 1396: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1397: free(options.control_path);
1.528 dtucker 1398: options.control_path = default_client_percent_dollar_expand(cp,
1.544 djm 1399: cinfo);
1.378 djm 1400: free(cp);
1.214 djm 1401: }
1.408 djm 1402:
1.522 dtucker 1403: if (options.identity_agent != NULL) {
1404: p = tilde_expand_filename(options.identity_agent, getuid());
1.544 djm 1405: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1406: free(p);
1407: free(options.identity_agent);
1408: options.identity_agent = cp;
1.586 dtucker 1409: }
1410:
1411: if (options.revoked_host_keys != NULL) {
1412: p = tilde_expand_filename(options.revoked_host_keys, getuid());
1413: cp = default_client_percent_dollar_expand(p, cinfo);
1414: free(p);
1415: free(options.revoked_host_keys);
1416: options.revoked_host_keys = cp;
1.522 dtucker 1417: }
1418:
1419: if (options.forward_agent_sock_path != NULL) {
1420: p = tilde_expand_filename(options.forward_agent_sock_path,
1421: getuid());
1.544 djm 1422: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1423: free(p);
1424: free(options.forward_agent_sock_path);
1425: options.forward_agent_sock_path = cp;
1.552 djm 1426: if (stat(options.forward_agent_sock_path, &st) != 0) {
1427: error("Cannot forward agent socket path \"%s\": %s",
1428: options.forward_agent_sock_path, strerror(errno));
1429: if (options.exit_on_forward_failure)
1430: cleanup_exit(255);
1431: }
1.532 dtucker 1432: }
1433:
1.545 djm 1434: if (options.num_system_hostfiles > 0 &&
1435: strcasecmp(options.system_hostfiles[0], "none") == 0) {
1436: if (options.num_system_hostfiles > 1)
1437: fatal("Invalid GlobalKnownHostsFiles: \"none\" "
1438: "appears with other entries");
1439: free(options.system_hostfiles[0]);
1440: options.system_hostfiles[0] = NULL;
1441: options.num_system_hostfiles = 0;
1442: }
1443:
1444: if (options.num_user_hostfiles > 0 &&
1445: strcasecmp(options.user_hostfiles[0], "none") == 0) {
1446: if (options.num_user_hostfiles > 1)
1447: fatal("Invalid UserKnownHostsFiles: \"none\" "
1448: "appears with other entries");
1449: free(options.user_hostfiles[0]);
1450: options.user_hostfiles[0] = NULL;
1451: options.num_user_hostfiles = 0;
1452: }
1.532 dtucker 1453: for (j = 0; j < options.num_user_hostfiles; j++) {
1.545 djm 1454: if (options.user_hostfiles[j] == NULL)
1455: continue;
1456: cp = tilde_expand_filename(options.user_hostfiles[j], getuid());
1457: p = default_client_percent_dollar_expand(cp, cinfo);
1458: if (strcmp(options.user_hostfiles[j], p) != 0)
1459: debug3("expanded UserKnownHostsFile '%s' -> "
1460: "'%s'", options.user_hostfiles[j], p);
1461: free(options.user_hostfiles[j]);
1462: free(cp);
1463: options.user_hostfiles[j] = p;
1.522 dtucker 1464: }
1465:
1.527 dtucker 1466: for (i = 0; i < options.num_local_forwards; i++) {
1467: if (options.local_forwards[i].listen_path != NULL) {
1468: cp = options.local_forwards[i].listen_path;
1469: p = options.local_forwards[i].listen_path =
1.544 djm 1470: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1471: if (strcmp(cp, p) != 0)
1472: debug3("expanded LocalForward listen path "
1473: "'%s' -> '%s'", cp, p);
1474: free(cp);
1475: }
1476: if (options.local_forwards[i].connect_path != NULL) {
1477: cp = options.local_forwards[i].connect_path;
1478: p = options.local_forwards[i].connect_path =
1.544 djm 1479: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1480: if (strcmp(cp, p) != 0)
1481: debug3("expanded LocalForward connect path "
1482: "'%s' -> '%s'", cp, p);
1483: free(cp);
1484: }
1485: }
1486:
1487: for (i = 0; i < options.num_remote_forwards; i++) {
1488: if (options.remote_forwards[i].listen_path != NULL) {
1489: cp = options.remote_forwards[i].listen_path;
1490: p = options.remote_forwards[i].listen_path =
1.544 djm 1491: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1492: if (strcmp(cp, p) != 0)
1493: debug3("expanded RemoteForward listen path "
1494: "'%s' -> '%s'", cp, p);
1495: free(cp);
1496: }
1497: if (options.remote_forwards[i].connect_path != NULL) {
1498: cp = options.remote_forwards[i].connect_path;
1499: p = options.remote_forwards[i].connect_path =
1.544 djm 1500: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1501: if (strcmp(cp, p) != 0)
1502: debug3("expanded RemoteForward connect path "
1503: "'%s' -> '%s'", cp, p);
1504: free(cp);
1505: }
1506: }
1507:
1.408 djm 1508: if (config_test) {
1509: dump_client_config(&options, host);
1510: exit(0);
1.508 djm 1511: }
1512:
1513: /* Expand SecurityKeyProvider if it refers to an environment variable */
1514: if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1515: strlen(options.sk_provider) > 1) {
1516: if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1.518 naddy 1517: debug("Authenticator provider %s did not resolve; "
1.508 djm 1518: "disabling", options.sk_provider);
1519: free(options.sk_provider);
1520: options.sk_provider = NULL;
1521: } else {
1522: debug2("resolved SecurityKeyProvider %s => %s",
1523: options.sk_provider, cp);
1524: free(options.sk_provider);
1525: options.sk_provider = xstrdup(cp);
1526: }
1.408 djm 1527: }
1.405 djm 1528:
1.312 djm 1529: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1530: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1531: if (options.control_path != NULL) {
1532: int sock;
1533: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1534: ssh_packet_set_connection(ssh, sock, sock);
1.499 djm 1535: ssh_packet_set_mux(ssh);
1.447 markus 1536: goto skip_connect;
1537: }
1538: }
1.401 djm 1539:
1540: /*
1541: * If hostname canonicalisation was not enabled, then we may not
1542: * have yet resolved the hostname. Do so now.
1543: */
1544: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1545: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1546: if ((addrs = resolve_host(host, options.port, 1,
1547: cname, sizeof(cname))) == NULL)
1548: cleanup_exit(255); /* resolve_host logs the error */
1549: }
1.214 djm 1550:
1.542 dtucker 1551: if (options.connection_timeout >= INT_MAX/1000)
1552: timeout_ms = INT_MAX;
1553: else
1554: timeout_ms = options.connection_timeout * 1000;
1.595 djm 1555:
1556: /* Apply channels timeouts, if set */
1557: channel_clear_timeouts(ssh);
1558: for (j = 0; j < options.num_channel_timeouts; j++) {
1559: debug3("applying channel timeout %s",
1560: options.channel_timeouts[j]);
1561: if (parse_pattern_interval(options.channel_timeouts[j],
1562: &cp, &i) != 0) {
1563: fatal_f("internal error: bad timeout %s",
1564: options.channel_timeouts[j]);
1565: }
1566: channel_add_timeout(ssh, cp, i);
1567: free(cp);
1568: }
1.303 djm 1569:
1.77 markus 1570: /* Open a connection to the remote host. */
1.583 dtucker 1571: if (ssh_connect(ssh, host, options.host_arg, addrs, &hostaddr,
1572: options.port, options.connection_attempts,
1.488 dtucker 1573: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1574: exit(255);
1.31 markus 1575:
1.391 djm 1576: if (addrs != NULL)
1577: freeaddrinfo(addrs);
1578:
1.499 djm 1579: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1580: options.server_alive_count_max);
1581:
1.303 djm 1582: if (timeout_ms > 0)
1583: debug3("timeout: %d ms remain after connect", timeout_ms);
1584:
1.33 markus 1585: /*
1.485 dtucker 1586: * If we successfully made the connection and we have hostbased auth
1587: * enabled, load the public keys so we can later use the ssh-keysign
1588: * helper to sign challenges.
1.33 markus 1589: */
1.112 markus 1590: sensitive_data.nkeys = 0;
1591: sensitive_data.keys = NULL;
1.457 djm 1592: if (options.hostbased_authentication) {
1.581 dtucker 1593: int loaded = 0;
1594:
1.486 dtucker 1595: sensitive_data.nkeys = 10;
1.274 deraadt 1596: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.578 jsg 1597: sizeof(*sensitive_data.keys));
1.483 markus 1598:
1599: /* XXX check errors? */
1.486 dtucker 1600: #define L_PUBKEY(p,o) do { \
1601: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1602: fatal_f("pubkey out of array bounds"); \
1.483 markus 1603: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.576 djm 1604: &(sensitive_data.keys[o]), p, "pubkey"); \
1.581 dtucker 1605: if (sensitive_data.keys[o] != NULL) { \
1.572 djm 1606: debug2("hostbased key %d: %s key from \"%s\"", o, \
1607: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.581 dtucker 1608: loaded++; \
1609: } \
1.486 dtucker 1610: } while (0)
1611: #define L_CERT(p,o) do { \
1612: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1613: fatal_f("cert out of array bounds"); \
1.576 djm 1614: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), \
1615: &(sensitive_data.keys[o]), p, "cert"); \
1.581 dtucker 1616: if (sensitive_data.keys[o] != NULL) { \
1.572 djm 1617: debug2("hostbased key %d: %s cert from \"%s\"", o, \
1618: sshkey_ssh_name(sensitive_data.keys[o]), p); \
1.581 dtucker 1619: loaded++; \
1620: } \
1.486 dtucker 1621: } while (0)
1.177 markus 1622:
1.485 dtucker 1623: if (options.hostbased_authentication == 1) {
1.486 dtucker 1624: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1625: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1626: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1627: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1628: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1629: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1630: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1631: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1632: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1633: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.581 dtucker 1634: if (loaded == 0)
1635: debug("HostbasedAuthentication enabled but no "
1636: "local public host keys could be loaded.");
1.173 markus 1637: }
1.367 djm 1638: }
1.31 markus 1639:
1.104 markus 1640: /* load options.identity_files */
1.544 djm 1641: load_public_identity_files(cinfo);
1.439 markus 1642:
1.476 djm 1643: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1644: if (options.identity_agent &&
1645: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1646: if (strcmp(options.identity_agent, "none") == 0) {
1647: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1648: } else {
1.522 dtucker 1649: cp = options.identity_agent;
1.528 dtucker 1650: /* legacy (limited) format */
1651: if (cp[0] == '$' && cp[1] != '{') {
1.494 djm 1652: if (!valid_env_name(cp + 1)) {
1653: fatal("Invalid IdentityAgent "
1654: "environment variable name %s", cp);
1655: }
1656: if ((p = getenv(cp + 1)) == NULL)
1657: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1658: else
1659: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1660: } else {
1661: /* identity_agent specifies a path directly */
1662: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1663: }
1.510 djm 1664: }
1665: }
1666:
1.522 dtucker 1667: if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1.526 djm 1668: cp = options.forward_agent_sock_path;
1.510 djm 1669: if (cp[0] == '$') {
1670: if (!valid_env_name(cp + 1)) {
1671: fatal("Invalid ForwardAgent environment variable name %s", cp);
1672: }
1673: if ((p = getenv(cp + 1)) != NULL)
1.566 dtucker 1674: forward_agent_sock_path = xstrdup(p);
1.510 djm 1675: else
1676: options.forward_agent = 0;
1677: free(cp);
1678: } else {
1679: forward_agent_sock_path = cp;
1.439 markus 1680: }
1681: }
1.104 markus 1682:
1683: /* Expand ~ in known host file names. */
1.361 djm 1684: tilde_expand_paths(options.system_hostfiles,
1685: options.num_system_hostfiles);
1686: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1687:
1.512 dtucker 1688: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1689:
1.316 djm 1690: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1691: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.546 djm 1692: options.port, pw, timeout_ms, cinfo);
1.31 markus 1693:
1.112 markus 1694: /* We no longer need the private host keys. Clear them now. */
1695: if (sensitive_data.nkeys != 0) {
1696: for (i = 0; i < sensitive_data.nkeys; i++) {
1697: if (sensitive_data.keys[i] != NULL) {
1698: /* Destroys contents safely */
1699: debug3("clear hostkey %d", i);
1.483 markus 1700: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1701: sensitive_data.keys[i] = NULL;
1702: }
1703: }
1.378 djm 1704: free(sensitive_data.keys);
1.134 markus 1705: }
1706: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1707: free(options.identity_files[i]);
1708: options.identity_files[i] = NULL;
1.134 markus 1709: if (options.identity_keys[i]) {
1.483 markus 1710: sshkey_free(options.identity_keys[i]);
1.134 markus 1711: options.identity_keys[i] = NULL;
1712: }
1.112 markus 1713: }
1.426 djm 1714: for (i = 0; i < options.num_certificate_files; i++) {
1715: free(options.certificate_files[i]);
1716: options.certificate_files[i] = NULL;
1717: }
1.553 djm 1718:
1719: #ifdef ENABLE_PKCS11
1720: (void)pkcs11_del_provider(options.pkcs11_provider);
1721: #endif
1.31 markus 1722:
1.447 markus 1723: skip_connect:
1.544 djm 1724: exit_status = ssh_session2(ssh, cinfo);
1725: ssh_conn_info_free(cinfo);
1.499 djm 1726: ssh_packet_close(ssh);
1.186 djm 1727:
1.312 djm 1728: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1729: unlink(options.control_path);
1730:
1.353 djm 1731: /* Kill ProxyCommand if it is running. */
1732: ssh_kill_proxy_command();
1.186 djm 1733:
1.45 markus 1734: return exit_status;
1735: }
1736:
1.344 djm 1737: static void
1738: control_persist_detach(void)
1739: {
1740: pid_t pid;
1741:
1.540 djm 1742: debug_f("backgrounding master process");
1.344 djm 1743:
1.473 djm 1744: /*
1745: * master (current process) into the background, and make the
1746: * foreground process a client of the backgrounded master.
1747: */
1.344 djm 1748: switch ((pid = fork())) {
1749: case -1:
1.540 djm 1750: fatal_f("fork: %s", strerror(errno));
1.344 djm 1751: case 0:
1752: /* Child: master process continues mainloop */
1.473 djm 1753: break;
1754: default:
1.593 djm 1755: /*
1756: * Parent: set up mux client to connect to backgrounded
1757: * master.
1758: */
1.540 djm 1759: debug2_f("background process is %ld", (long)pid);
1.563 djm 1760: options.stdin_null = ostdin_null_flag;
1.359 djm 1761: options.request_tty = orequest_tty;
1.344 djm 1762: tty_flag = otty_flag;
1.593 djm 1763: options.fork_after_authentication = ofork_after_authentication;
1.561 djm 1764: options.session_type = osession_type;
1.473 djm 1765: close(muxserver_sock);
1766: muxserver_sock = -1;
1.351 markus 1767: options.control_master = SSHCTL_MASTER_NO;
1.587 dtucker 1768: (void)muxclient(options.control_path);
1.344 djm 1769: /* muxclient() doesn't return on success. */
1.473 djm 1770: fatal("Failed to connect to new control master");
1771: }
1.537 djm 1772: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1773: error_f("stdfd_devnull failed");
1.381 djm 1774: daemon(1, 1);
1.362 djm 1775: setproctitle("%s [mux]", options.control_path);
1.344 djm 1776: }
1777:
1778: /* Do fork() after authentication. Used by "ssh -f" */
1779: static void
1780: fork_postauth(void)
1781: {
1782: if (need_controlpersist_detach)
1783: control_persist_detach();
1784: debug("forking to background");
1.564 djm 1785: options.fork_after_authentication = 0;
1.505 deraadt 1786: if (daemon(1, 1) == -1)
1.344 djm 1787: fatal("daemon() failed: %.200s", strerror(errno));
1.537 djm 1788: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1789: error_f("stdfd_devnull failed");
1.344 djm 1790: }
1791:
1.523 djm 1792: static void
1793: forwarding_success(void)
1794: {
1.524 djm 1795: if (forward_confirms_pending == -1)
1796: return;
1797: if (--forward_confirms_pending == 0) {
1.540 djm 1798: debug_f("all expected forwarding replies received");
1.564 djm 1799: if (options.fork_after_authentication)
1.523 djm 1800: fork_postauth();
1.524 djm 1801: } else {
1.540 djm 1802: debug2_f("%d expected forwarding replies remaining",
1803: forward_confirms_pending);
1.523 djm 1804: }
1805: }
1806:
1.315 djm 1807: /* Callback for remote forward global requests */
1808: static void
1.463 djm 1809: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1810: {
1.406 millert 1811: struct Forward *rfwd = (struct Forward *)ctxt;
1.499 djm 1812: u_int port;
1813: int r;
1.315 djm 1814:
1.324 djm 1815: /* XXX verbose() on failure? */
1.404 markus 1816: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1817: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1818: rfwd->listen_path ? rfwd->listen_path :
1819: rfwd->listen_host ? rfwd->listen_host : "",
1820: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1821: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1822: rfwd->connect_host, rfwd->connect_port);
1823: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1824: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1.499 djm 1825: if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1.540 djm 1826: fatal_fr(r, "parse packet");
1.499 djm 1827: if (port > 65535) {
1828: error("Invalid allocated port %u for remote "
1829: "forward to %s:%d", port,
1830: rfwd->connect_host, rfwd->connect_port);
1831: /* Ensure failure processing runs below */
1832: type = SSH2_MSG_REQUEST_FAILURE;
1833: channel_update_permission(ssh,
1834: rfwd->handle, -1);
1835: } else {
1836: rfwd->allocated_port = (int)port;
1837: logit("Allocated port %u for remote "
1838: "forward to %s:%d",
1.569 dtucker 1839: rfwd->allocated_port, rfwd->connect_path ?
1840: rfwd->connect_path : rfwd->connect_host,
1.499 djm 1841: rfwd->connect_port);
1842: channel_update_permission(ssh,
1843: rfwd->handle, rfwd->allocated_port);
1844: }
1.366 markus 1845: } else {
1.480 djm 1846: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1847: }
1.324 djm 1848: }
1.468 djm 1849:
1.315 djm 1850: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1851: if (options.exit_on_forward_failure) {
1852: if (rfwd->listen_path != NULL)
1853: fatal("Error: remote port forwarding failed "
1854: "for listen path %s", rfwd->listen_path);
1855: else
1856: fatal("Error: remote port forwarding failed "
1857: "for listen port %d", rfwd->listen_port);
1858: } else {
1859: if (rfwd->listen_path != NULL)
1860: logit("Warning: remote port forwarding failed "
1861: "for listen path %s", rfwd->listen_path);
1862: else
1863: logit("Warning: remote port forwarding failed "
1864: "for listen port %d", rfwd->listen_port);
1865: }
1.315 djm 1866: }
1.523 djm 1867: forwarding_success();
1.315 djm 1868: }
1869:
1.126 itojun 1870: static void
1.582 djm 1871: client_cleanup_stdio_fwd(struct ssh *ssh, int id, int force, void *arg)
1.331 dtucker 1872: {
1873: debug("stdio forwarding: done");
1874: cleanup_exit(0);
1875: }
1876:
1.368 djm 1877: static void
1.463 djm 1878: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1879: {
1880: if (!success)
1881: fatal("stdio forwarding failed");
1882: }
1883:
1884: static void
1.523 djm 1885: ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
1886: {
1887: if (!success) {
1888: error("Tunnel forwarding failed");
1889: if (options.exit_on_forward_failure)
1890: cleanup_exit(255);
1891: }
1892:
1.540 djm 1893: debug_f("tunnel forward established, id=%d", id);
1.523 djm 1894: forwarding_success();
1895: }
1896:
1897: static void
1.463 djm 1898: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1899: {
1900: Channel *c;
1.332 djm 1901: int in, out;
1.331 dtucker 1902:
1.441 dtucker 1903: if (options.stdio_forward_host == NULL)
1.368 djm 1904: return;
1905:
1.540 djm 1906: debug3_f("%s:%d", options.stdio_forward_host,
1.441 dtucker 1907: options.stdio_forward_port);
1.332 djm 1908:
1.505 deraadt 1909: if ((in = dup(STDIN_FILENO)) == -1 ||
1910: (out = dup(STDOUT_FILENO)) == -1)
1.557 djm 1911: fatal_f("dup() in/out failed");
1.463 djm 1912: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.557 djm 1913: options.stdio_forward_port, in, out,
1914: CHANNEL_NONBLOCK_STDIO)) == NULL)
1.540 djm 1915: fatal_f("channel_connect_stdio_fwd failed");
1.463 djm 1916: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1917: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1918: }
1919:
1920: static void
1.551 markus 1921: ssh_init_forward_permissions(struct ssh *ssh, const char *what, char **opens,
1922: u_int num_opens)
1923: {
1924: u_int i;
1925: int port;
1.573 dtucker 1926: char *addr, *arg, *oarg;
1.551 markus 1927: int where = FORWARD_LOCAL;
1928:
1929: channel_clear_permission(ssh, FORWARD_ADM, where);
1930: if (num_opens == 0)
1931: return; /* permit any */
1932:
1933: /* handle keywords: "any" / "none" */
1934: if (num_opens == 1 && strcmp(opens[0], "any") == 0)
1935: return;
1936: if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
1937: channel_disable_admin(ssh, where);
1938: return;
1939: }
1940: /* Otherwise treat it as a list of permitted host:port */
1941: for (i = 0; i < num_opens; i++) {
1942: oarg = arg = xstrdup(opens[i]);
1.573 dtucker 1943: addr = hpdelim(&arg);
1944: if (addr == NULL)
1.551 markus 1945: fatal_f("missing host in %s", what);
1946: addr = cleanhostname(addr);
1947: if (arg == NULL || ((port = permitopen_port(arg)) < 0))
1948: fatal_f("bad port number in %s", what);
1949: /* Send it to channels layer */
1950: channel_add_permission(ssh, FORWARD_ADM,
1951: where, addr, port);
1952: free(oarg);
1953: }
1954: }
1955:
1956: static void
1.466 djm 1957: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1958: {
1.86 markus 1959: int success = 0;
1.70 markus 1960: int i;
1.551 markus 1961:
1962: ssh_init_forward_permissions(ssh, "permitremoteopen",
1963: options.permitted_remote_opens,
1964: options.num_permitted_remote_opens);
1.331 dtucker 1965:
1.524 djm 1966: if (options.exit_on_forward_failure)
1967: forward_confirms_pending = 0; /* track pending requests */
1.70 markus 1968: /* Initiate local TCP/IP port forwardings. */
1969: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1970: debug("Local connections to %.200s:%d forwarded to remote "
1971: "address %.200s:%d",
1.406 millert 1972: (options.local_forwards[i].listen_path != NULL) ?
1973: options.local_forwards[i].listen_path :
1.234 deraadt 1974: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1975: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1976: options.local_forwards[i].listen_host,
1977: options.local_forwards[i].listen_port,
1.406 millert 1978: (options.local_forwards[i].connect_path != NULL) ?
1979: options.local_forwards[i].connect_path :
1.232 djm 1980: options.local_forwards[i].connect_host,
1981: options.local_forwards[i].connect_port);
1.463 djm 1982: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1983: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1984: }
1.283 markus 1985: if (i > 0 && success != i && options.exit_on_forward_failure)
1986: fatal("Could not request local forwarding.");
1.86 markus 1987: if (i > 0 && success == 0)
1988: error("Could not request local forwarding.");
1.70 markus 1989:
1990: /* Initiate remote TCP/IP port forwardings. */
1991: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1992: debug("Remote connections from %.200s:%d forwarded to "
1993: "local address %.200s:%d",
1.406 millert 1994: (options.remote_forwards[i].listen_path != NULL) ?
1995: options.remote_forwards[i].listen_path :
1.248 djm 1996: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1997: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1998: options.remote_forwards[i].listen_port,
1.406 millert 1999: (options.remote_forwards[i].connect_path != NULL) ?
2000: options.remote_forwards[i].connect_path :
1.232 djm 2001: options.remote_forwards[i].connect_host,
2002: options.remote_forwards[i].connect_port);
1.523 djm 2003: if ((options.remote_forwards[i].handle =
1.463 djm 2004: channel_request_remote_forwarding(ssh,
1.523 djm 2005: &options.remote_forwards[i])) >= 0) {
1.463 djm 2006: client_register_global_confirm(
2007: ssh_confirm_remote_forward,
1.366 markus 2008: &options.remote_forwards[i]);
1.523 djm 2009: forward_confirms_pending++;
2010: } else if (options.exit_on_forward_failure)
2011: fatal("Could not request remote forwarding.");
2012: else
2013: logit("Warning: Could not request remote forwarding.");
1.70 markus 2014: }
1.301 djm 2015:
2016: /* Initiate tunnel forwarding. */
2017: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 2018: if ((*ifname = client_request_tun_fwd(ssh,
2019: options.tun_open, options.tun_local,
1.523 djm 2020: options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
2021: forward_confirms_pending++;
2022: else if (options.exit_on_forward_failure)
2023: fatal("Could not request tunnel forwarding.");
2024: else
2025: error("Could not request tunnel forwarding.");
1.524 djm 2026: }
2027: if (forward_confirms_pending > 0) {
1.540 djm 2028: debug_f("expecting replies for %d forwards",
1.524 djm 2029: forward_confirms_pending);
1.468 djm 2030: }
1.70 markus 2031: }
2032:
1.126 itojun 2033: static void
1.70 markus 2034: check_agent_present(void)
2035: {
1.412 djm 2036: int r;
2037:
1.70 markus 2038: if (options.forward_agent) {
1.254 djm 2039: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 2040: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 2041: options.forward_agent = 0;
1.412 djm 2042: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.540 djm 2043: debug_r(r, "ssh_get_authentication_socket");
1.412 djm 2044: }
1.70 markus 2045: }
2046: }
2047:
1.214 djm 2048: static void
1.463 djm 2049: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 2050: {
1.215 djm 2051: extern char **environ;
1.558 djm 2052: const char *display, *term;
1.499 djm 2053: int r, interactive = tty_flag;
1.433 djm 2054: char *proto = NULL, *data = NULL;
1.337 djm 2055:
2056: if (!success)
1.580 djm 2057: return; /* No need for error message, channels code sends one */
1.215 djm 2058:
1.248 djm 2059: display = getenv("DISPLAY");
1.417 djm 2060: if (display == NULL && options.forward_x11)
2061: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 2062: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 2063: options.xauth_location, options.forward_x11_trusted,
2064: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 2065: /* Request forwarding with authentication spoofing. */
1.316 djm 2066: debug("Requesting X11 forwarding with authentication "
2067: "spoofing.");
1.463 djm 2068: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 2069: data, 1);
1.463 djm 2070: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 2071: /* XXX exit_on_forward_failure */
1.80 markus 2072: interactive = 1;
1.50 markus 2073: }
2074:
1.70 markus 2075: check_agent_present();
2076: if (options.forward_agent) {
2077: debug("Requesting authentication agent forwarding.");
1.463 djm 2078: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 2079: if ((r = sshpkt_send(ssh)) != 0)
1.540 djm 2080: fatal_fr(r, "send packet");
1.212 djm 2081: }
1.369 dtucker 2082:
2083: /* Tell the packet module whether this is an interactive session. */
1.499 djm 2084: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 2085: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 2086:
1.558 djm 2087: if ((term = lookup_env_in_list("TERM", options.setenv,
2088: options.num_setenv)) == NULL || *term == '\0')
2089: term = getenv("TERM");
1.562 djm 2090: client_session2_setup(ssh, id, tty_flag,
2091: options.session_type == SESSION_TYPE_SUBSYSTEM, term,
1.482 markus 2092: NULL, fileno(stdin), command, environ);
1.45 markus 2093: }
2094:
1.143 markus 2095: /* open new channel for a session */
1.126 itojun 2096: static int
1.463 djm 2097: ssh_session2_open(struct ssh *ssh)
1.45 markus 2098: {
1.118 markus 2099: Channel *c;
2100: int window, packetmax, in, out, err;
1.60 markus 2101:
1.563 djm 2102: if (options.stdin_null) {
1.93 itojun 2103: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 2104: } else {
2105: in = dup(STDIN_FILENO);
2106: }
1.60 markus 2107: out = dup(STDOUT_FILENO);
2108: err = dup(STDERR_FILENO);
1.45 markus 2109:
1.505 deraadt 2110: if (in == -1 || out == -1 || err == -1)
1.62 markus 2111: fatal("dup() in/out/err failed");
1.45 markus 2112:
1.65 markus 2113: window = CHAN_SES_WINDOW_DEFAULT;
2114: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 2115: if (tty_flag) {
2116: window >>= 1;
2117: packetmax >>= 1;
1.45 markus 2118: }
1.463 djm 2119: c = channel_new(ssh,
1.45 markus 2120: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 2121: window, packetmax, CHAN_EXTENDED_WRITE,
1.557 djm 2122: "client-session", CHANNEL_NONBLOCK_STDIO);
1.45 markus 2123:
1.540 djm 2124: debug3_f("channel_new: %d", c->self);
1.106 markus 2125:
1.463 djm 2126: channel_send_open(ssh, c->self);
1.560 djm 2127: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2128: channel_register_open_confirm(ssh, c->self,
1.310 djm 2129: ssh_session2_setup, NULL);
1.106 markus 2130:
1.118 markus 2131: return c->self;
1.106 markus 2132: }
2133:
1.126 itojun 2134: static int
1.544 djm 2135: ssh_session2(struct ssh *ssh, const struct ssh_conn_info *cinfo)
1.106 markus 2136: {
1.594 djm 2137: int r, interactive, id = -1;
1.466 djm 2138: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 2139:
2140: /* XXX should be pre-session */
1.368 djm 2141: if (!options.control_persist)
1.463 djm 2142: ssh_init_stdio_forwarding(ssh);
1.466 djm 2143:
2144: ssh_init_forwarding(ssh, &tun_fwd_ifname);
2145:
2146: if (options.local_command != NULL) {
2147: debug3("expanding LocalCommand: %s", options.local_command);
2148: cp = options.local_command;
2149: options.local_command = percent_expand(cp,
1.546 djm 2150: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.466 djm 2151: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2152: (char *)NULL);
2153: debug3("expanded LocalCommand: %s", options.local_command);
2154: free(cp);
2155: }
1.106 markus 2156:
1.344 djm 2157: /* Start listening for multiplex clients */
1.499 djm 2158: if (!ssh_packet_get_mux(ssh))
1.463 djm 2159: muxserver_listen(ssh);
1.344 djm 2160:
1.473 djm 2161: /*
1.368 djm 2162: * If we are in control persist mode and have a working mux listen
2163: * socket, then prepare to background ourselves and have a foreground
1.531 djm 2164: * client attach as a control client.
1.368 djm 2165: * NB. we must save copies of the flags that we override for
1.531 djm 2166: * the backgrounding, since we defer attachment of the client until
1.344 djm 2167: * after the connection is fully established (in particular,
2168: * async rfwd replies have been received for ExitOnForwardFailure).
2169: */
1.473 djm 2170: if (options.control_persist && muxserver_sock != -1) {
1.563 djm 2171: ostdin_null_flag = options.stdin_null;
1.560 djm 2172: osession_type = options.session_type;
1.359 djm 2173: orequest_tty = options.request_tty;
1.344 djm 2174: otty_flag = tty_flag;
1.593 djm 2175: ofork_after_authentication = options.fork_after_authentication;
1.563 djm 2176: options.stdin_null = 1;
1.560 djm 2177: options.session_type = SESSION_TYPE_NONE;
1.473 djm 2178: tty_flag = 0;
1.593 djm 2179: if ((osession_type != SESSION_TYPE_NONE ||
1.562 djm 2180: options.stdio_forward_host != NULL))
1.344 djm 2181: need_controlpersist_detach = 1;
1.564 djm 2182: options.fork_after_authentication = 1;
1.473 djm 2183: }
1.368 djm 2184: /*
2185: * ControlPersist mux listen socket setup failed, attempt the
2186: * stdio forward setup that we skipped earlier.
2187: */
2188: if (options.control_persist && muxserver_sock == -1)
1.463 djm 2189: ssh_init_stdio_forwarding(ssh);
1.344 djm 2190:
1.560 djm 2191: if (options.session_type != SESSION_TYPE_NONE)
1.463 djm 2192: id = ssh_session2_open(ssh);
1.379 djm 2193: else {
1.594 djm 2194: interactive = options.control_master == SSHCTL_MASTER_NO;
2195: /* ControlPersist may have clobbered ControlMaster, so check */
2196: if (need_controlpersist_detach)
2197: interactive = otty_flag != 0;
2198: ssh_packet_set_interactive(ssh, interactive,
1.379 djm 2199: options.ip_qos_interactive, options.ip_qos_bulk);
2200: }
1.314 djm 2201:
2202: /* If we don't expect to open a new session, then disallow it */
1.319 markus 2203: if (options.control_master == SSHCTL_MASTER_NO &&
1.549 djm 2204: (ssh->compat & SSH_NEW_OPENSSH)) {
1.314 djm 2205: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 2206: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2207: (r = sshpkt_put_cstring(ssh,
2208: "no-more-sessions@openssh.com")) != 0 ||
2209: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2210: (r = sshpkt_send(ssh)) != 0)
1.540 djm 2211: fatal_fr(r, "send packet");
1.314 djm 2212: }
1.255 reyk 2213:
2214: /* Execute a local command */
2215: if (options.local_command != NULL &&
2216: options.permit_local_command)
2217: ssh_local_cmd(options.local_command);
1.467 djm 2218:
2219: /*
2220: * stdout is now owned by the session channel; clobber it here
2221: * so future channel closes are propagated to the local fd.
2222: * NB. this can only happen after LocalCommand has completed,
2223: * as it may want to write to stdout.
2224: */
1.537 djm 2225: if (!need_controlpersist_detach && stdfd_devnull(0, 1, 0) == -1)
1.540 djm 2226: error_f("stdfd_devnull failed");
1.301 djm 2227:
1.342 djm 2228: /*
2229: * If requested and we are not interested in replies to remote
2230: * forwarding requests, then let ssh continue in the background.
2231: */
1.564 djm 2232: if (options.fork_after_authentication) {
1.344 djm 2233: if (options.exit_on_forward_failure &&
2234: options.num_remote_forwards > 0) {
2235: debug("deferring postauth fork until remote forward "
2236: "confirmation received");
2237: } else
2238: fork_postauth();
1.318 djm 2239: }
1.31 markus 2240:
1.463 djm 2241: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2242: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2243: }
2244:
1.426 djm 2245: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2246: static void
1.544 djm 2247: load_public_identity_files(const struct ssh_conn_info *cinfo)
1.104 markus 2248: {
1.466 djm 2249: char *filename, *cp;
1.460 markus 2250: struct sshkey *public;
1.426 djm 2251: int i;
2252: u_int n_ids, n_certs;
1.335 djm 2253: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2254: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2255: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2256: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2257: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2258: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2259: #ifdef ENABLE_PKCS11
1.514 djm 2260: struct sshkey **keys = NULL;
2261: char **comments = NULL;
1.333 markus 2262: int nkeys;
1.335 djm 2263: #endif /* PKCS11 */
1.104 markus 2264:
1.426 djm 2265: n_ids = n_certs = 0;
1.398 tedu 2266: memset(identity_files, 0, sizeof(identity_files));
2267: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2268: memset(identity_file_userprovided, 0,
2269: sizeof(identity_file_userprovided));
1.426 djm 2270: memset(certificate_files, 0, sizeof(certificate_files));
2271: memset(certificates, 0, sizeof(certificates));
1.484 djm 2272: memset(certificate_file_userprovided, 0,
2273: sizeof(certificate_file_userprovided));
1.335 djm 2274:
2275: #ifdef ENABLE_PKCS11
1.333 markus 2276: if (options.pkcs11_provider != NULL &&
1.167 markus 2277: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2278: (pkcs11_init(!options.batch_mode) == 0) &&
2279: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1.514 djm 2280: &keys, &comments)) > 0) {
1.333 markus 2281: for (i = 0; i < nkeys; i++) {
1.335 djm 2282: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2283: sshkey_free(keys[i]);
1.514 djm 2284: free(comments[i]);
1.335 djm 2285: continue;
2286: }
2287: identity_keys[n_ids] = keys[i];
1.514 djm 2288: identity_files[n_ids] = comments[i]; /* transferred */
1.335 djm 2289: n_ids++;
1.167 markus 2290: }
1.378 djm 2291: free(keys);
1.514 djm 2292: free(comments);
1.127 markus 2293: }
1.333 markus 2294: #endif /* ENABLE_PKCS11 */
1.335 djm 2295: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2296: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2297: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2298: free(options.identity_files[i]);
1.426 djm 2299: options.identity_files[i] = NULL;
1.335 djm 2300: continue;
2301: }
1.490 dtucker 2302: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.544 djm 2303: filename = default_client_percent_dollar_expand(cp, cinfo);
1.378 djm 2304: free(cp);
1.483 markus 2305: check_load(sshkey_load_public(filename, &public, NULL),
1.576 djm 2306: &public, filename, "pubkey");
1.131 millert 2307: debug("identity file %s type %d", filename,
2308: public ? public->type : -1);
1.378 djm 2309: free(options.identity_files[i]);
1.335 djm 2310: identity_files[n_ids] = filename;
2311: identity_keys[n_ids] = public;
1.484 djm 2312: identity_file_userprovided[n_ids] =
2313: options.identity_file_userprovided[i];
1.335 djm 2314: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2315: continue;
2316:
1.426 djm 2317: /*
2318: * If no certificates have been explicitly listed then try
2319: * to add the default certificate variant too.
2320: */
2321: if (options.num_certificate_files != 0)
2322: continue;
1.335 djm 2323: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2324: check_load(sshkey_load_public(cp, &public, NULL),
1.576 djm 2325: &public, filename, "pubkey");
1.335 djm 2326: debug("identity file %s type %d", cp,
2327: public ? public->type : -1);
2328: if (public == NULL) {
1.378 djm 2329: free(cp);
1.335 djm 2330: continue;
2331: }
1.483 markus 2332: if (!sshkey_is_cert(public)) {
1.540 djm 2333: debug_f("key %s type %s is not a certificate",
2334: cp, sshkey_type(public));
1.483 markus 2335: sshkey_free(public);
1.378 djm 2336: free(cp);
1.335 djm 2337: continue;
2338: }
1.448 djm 2339: /* NB. leave filename pointing to private key */
2340: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2341: identity_keys[n_ids] = public;
1.484 djm 2342: identity_file_userprovided[n_ids] =
2343: options.identity_file_userprovided[i];
1.335 djm 2344: n_ids++;
2345: }
1.426 djm 2346:
2347: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
1.540 djm 2348: fatal_f("too many certificates");
1.426 djm 2349: for (i = 0; i < options.num_certificate_files; i++) {
2350: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2351: getuid());
1.544 djm 2352: filename = default_client_percent_dollar_expand(cp, cinfo);
1.426 djm 2353: free(cp);
2354:
1.483 markus 2355: check_load(sshkey_load_public(filename, &public, NULL),
1.576 djm 2356: &public, filename, "certificate");
1.426 djm 2357: debug("certificate file %s type %d", filename,
2358: public ? public->type : -1);
2359: free(options.certificate_files[i]);
2360: options.certificate_files[i] = NULL;
2361: if (public == NULL) {
2362: free(filename);
2363: continue;
2364: }
1.483 markus 2365: if (!sshkey_is_cert(public)) {
1.540 djm 2366: debug_f("key %s type %s is not a certificate",
2367: filename, sshkey_type(public));
1.483 markus 2368: sshkey_free(public);
1.426 djm 2369: free(filename);
2370: continue;
2371: }
2372: certificate_files[n_certs] = filename;
2373: certificates[n_certs] = public;
1.484 djm 2374: certificate_file_userprovided[n_certs] =
2375: options.certificate_file_userprovided[i];
1.426 djm 2376: ++n_certs;
2377: }
2378:
1.335 djm 2379: options.num_identity_files = n_ids;
2380: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2381: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2382: memcpy(options.identity_file_userprovided,
2383: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2384:
2385: options.num_certificate_files = n_certs;
2386: memcpy(options.certificate_files,
2387: certificate_files, sizeof(certificate_files));
2388: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2389: memcpy(options.certificate_file_userprovided,
2390: certificate_file_userprovided,
2391: sizeof(certificate_file_userprovided));
1.214 djm 2392: }
1.352 djm 2393:
2394: static void
2395: main_sigchld_handler(int sig)
2396: {
2397: int save_errno = errno;
2398: pid_t pid;
2399: int status;
2400:
2401: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2402: (pid == -1 && errno == EINTR))
1.352 djm 2403: ;
2404: errno = save_errno;
2405: }
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