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