Annotation of src/usr.bin/ssh/ssh.c, Revision 1.551
1.551 ! markus 1: /* $OpenBSD: ssh.c,v 1.550 2021/02/02 22:36:59 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:
1.45 markus 113: /* don't exec a shell */
114: int no_shell_flag = 0;
115:
1.33 markus 116: /*
117: * Flag indicating that nothing should be read from stdin. This can be set
118: * on the command line.
119: */
1.1 deraadt 120: int stdin_null_flag = 0;
121:
1.33 markus 122: /*
1.344 djm 123: * Flag indicating that the current process should be backgrounded and
1.531 djm 124: * a new mux-client launched in the foreground for ControlPersist.
1.344 djm 125: */
126: int need_controlpersist_detach = 0;
127:
1.531 djm 128: /* Copies of flags for ControlPersist foreground mux-client */
1.359 djm 129: int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
1.344 djm 130:
131: /*
1.33 markus 132: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 133: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 134: * background.
135: */
1.1 deraadt 136: int fork_after_authentication_flag = 0;
137:
1.33 markus 138: /*
139: * General data structure for command line options and options configurable
140: * in configuration files. See readconf.h.
141: */
1.1 deraadt 142: Options options;
143:
1.139 markus 144: /* optional user configfile */
145: char *config = NULL;
146:
1.33 markus 147: /*
148: * Name of the host we are connecting to. This is the name given on the
1.503 jmc 149: * command line, or the Hostname specified for the user-supplied name in a
1.33 markus 150: * configuration file.
151: */
1.1 deraadt 152: char *host;
153:
1.510 djm 154: /*
155: * A config can specify a path to forward, overriding SSH_AUTH_SOCK. If this is
156: * not NULL, forward the socket at this path instead.
157: */
158: char *forward_agent_sock_path = NULL;
159:
1.22 provos 160: /* socket address the host resolves to */
1.37 markus 161: struct sockaddr_storage hostaddr;
1.1 deraadt 162:
1.112 markus 163: /* Private host keys. */
1.173 markus 164: Sensitive sensitive_data;
1.1 deraadt 165:
1.45 markus 166: /* command to be executed */
1.482 markus 167: struct sshbuf *command;
1.45 markus 168:
1.85 djm 169: /* Should we execute a command or invoke a subsystem? */
170: int subsystem_flag = 0;
171:
1.170 markus 172: /* # of replies received for global requests */
1.523 djm 173: static int forward_confirms_pending = -1;
1.170 markus 174:
1.313 djm 175: /* mux.c */
176: extern int muxserver_sock;
177: extern u_int muxclient_command;
178:
1.1 deraadt 179: /* Prints a help message to the user. This function never returns. */
180:
1.126 itojun 181: static void
1.93 itojun 182: usage(void)
1.1 deraadt 183: {
1.208 markus 184: fprintf(stderr,
1.474 djm 185: "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n"
186: " [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n"
187: " [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n"
188: " [-i identity_file] [-J [user@]host[:port]] [-L address]\n"
189: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
190: " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
191: " [-w local_tun[:remote_tun]] destination [command]\n"
1.208 markus 192: );
1.257 dtucker 193: exit(255);
1.1 deraadt 194: }
195:
1.544 djm 196: static int ssh_session2(struct ssh *, const struct ssh_conn_info *);
197: static void load_public_identity_files(const struct ssh_conn_info *);
1.352 djm 198: static void main_sigchld_handler(int);
1.312 djm 199:
1.361 djm 200: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
201: static void
202: tilde_expand_paths(char **paths, u_int num_paths)
203: {
204: u_int i;
205: char *cp;
206:
207: for (i = 0; i < num_paths; i++) {
1.490 dtucker 208: cp = tilde_expand_filename(paths[i], getuid());
1.378 djm 209: free(paths[i]);
1.361 djm 210: paths[i] = cp;
211: }
212: }
213:
1.527 dtucker 214: /*
215: * Expands the set of percent_expand options used by the majority of keywords
216: * in the client that support percent expansion.
217: * Caller must free returned string.
218: */
219: static char *
1.544 djm 220: default_client_percent_expand(const char *str,
221: const struct ssh_conn_info *cinfo)
1.527 dtucker 222: {
223: return percent_expand(str,
1.546 djm 224: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.527 dtucker 225: (char *)NULL);
226: }
227:
1.400 djm 228: /*
1.528 dtucker 229: * Expands the set of percent_expand options used by the majority of keywords
230: * AND perform environment variable substitution.
231: * Caller must free returned string.
232: */
233: static char *
1.544 djm 234: default_client_percent_dollar_expand(const char *str,
235: const struct ssh_conn_info *cinfo)
1.528 dtucker 236: {
237: char *ret;
238:
239: ret = percent_dollar_expand(str,
1.546 djm 240: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.528 dtucker 241: (char *)NULL);
242: if (ret == NULL)
243: fatal("invalid environment variable expansion");
244: return ret;
245: }
246:
247: /*
1.400 djm 248: * Attempt to resolve a host name / port to a set of addresses and
249: * optionally return any CNAMEs encountered along the way.
250: * Returns NULL on failure.
251: * NB. this function must operate with a options having undefined members.
252: */
1.385 djm 253: static struct addrinfo *
1.400 djm 254: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 255: {
256: char strport[NI_MAXSERV];
257: struct addrinfo hints, *res;
1.501 dtucker 258: int gaierr;
259: LogLevel loglevel = SYSLOG_LEVEL_DEBUG1;
1.385 djm 260:
1.400 djm 261: if (port <= 0)
262: port = default_ssh_port();
1.521 markus 263: if (cname != NULL)
264: *cname = '\0';
1.400 djm 265:
1.427 djm 266: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 267: memset(&hints, 0, sizeof(hints));
1.400 djm 268: hints.ai_family = options.address_family == -1 ?
269: AF_UNSPEC : options.address_family;
1.385 djm 270: hints.ai_socktype = SOCK_STREAM;
271: if (cname != NULL)
272: hints.ai_flags = AI_CANONNAME;
273: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
274: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
275: loglevel = SYSLOG_LEVEL_ERROR;
276: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
277: __progname, name, ssh_gai_strerror(gaierr));
278: return NULL;
279: }
280: if (cname != NULL && res->ai_canonname != NULL) {
281: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
1.540 djm 282: error_f("host \"%s\" cname \"%s\" too long (max %lu)",
283: name, res->ai_canonname, (u_long)clen);
1.385 djm 284: if (clen > 0)
285: *cname = '\0';
286: }
287: }
288: return res;
289: }
290:
1.470 djm 291: /* Returns non-zero if name can only be an address and not a hostname */
292: static int
293: is_addr_fast(const char *name)
294: {
295: return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
296: strspn(name, "0123456789.") == strlen(name));
297: }
298:
299: /* Returns non-zero if name represents a valid, single address */
300: static int
301: is_addr(const char *name)
302: {
303: char strport[NI_MAXSERV];
304: struct addrinfo hints, *res;
305:
306: if (is_addr_fast(name))
307: return 1;
308:
309: snprintf(strport, sizeof strport, "%u", default_ssh_port());
310: memset(&hints, 0, sizeof(hints));
311: hints.ai_family = options.address_family == -1 ?
312: AF_UNSPEC : options.address_family;
313: hints.ai_socktype = SOCK_STREAM;
314: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
315: if (getaddrinfo(name, strport, &hints, &res) != 0)
316: return 0;
317: if (res == NULL || res->ai_next != NULL) {
318: freeaddrinfo(res);
319: return 0;
320: }
321: freeaddrinfo(res);
322: return 1;
323: }
324:
1.385 djm 325: /*
1.413 djm 326: * Attempt to resolve a numeric host address / port to a single address.
327: * Returns a canonical address string.
328: * Returns NULL on failure.
329: * NB. this function must operate with a options having undefined members.
330: */
331: static struct addrinfo *
332: resolve_addr(const char *name, int port, char *caddr, size_t clen)
333: {
334: char addr[NI_MAXHOST], strport[NI_MAXSERV];
335: struct addrinfo hints, *res;
336: int gaierr;
337:
338: if (port <= 0)
339: port = default_ssh_port();
340: snprintf(strport, sizeof strport, "%u", port);
341: memset(&hints, 0, sizeof(hints));
342: hints.ai_family = options.address_family == -1 ?
343: AF_UNSPEC : options.address_family;
344: hints.ai_socktype = SOCK_STREAM;
345: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
346: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
1.540 djm 347: debug2_f("could not resolve name %.100s as address: %s",
348: name, ssh_gai_strerror(gaierr));
1.413 djm 349: return NULL;
350: }
351: if (res == NULL) {
1.540 djm 352: debug_f("getaddrinfo %.100s returned no addresses", name);
1.413 djm 353: return NULL;
354: }
355: if (res->ai_next != NULL) {
1.540 djm 356: debug_f("getaddrinfo %.100s returned multiple addresses", name);
1.413 djm 357: goto fail;
358: }
359: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
360: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
1.540 djm 361: debug_f("Could not format address for name %.100s: %s",
362: name, ssh_gai_strerror(gaierr));
1.413 djm 363: goto fail;
364: }
365: if (strlcpy(caddr, addr, clen) >= clen) {
1.540 djm 366: error_f("host \"%s\" addr \"%s\" too long (max %lu)",
367: name, addr, (u_long)clen);
1.413 djm 368: if (clen > 0)
369: *caddr = '\0';
370: fail:
371: freeaddrinfo(res);
372: return NULL;
373: }
374: return res;
375: }
376:
377: /*
1.385 djm 378: * Check whether the cname is a permitted replacement for the hostname
379: * and perform the replacement if it is.
1.400 djm 380: * NB. this function must operate with a options having undefined members.
1.385 djm 381: */
382: static int
1.443 djm 383: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 384: {
385: int i;
386: struct allowed_cname *rule;
387:
388: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
389: strcmp(*namep, cname) == 0)
390: return 0;
1.386 djm 391: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 392: return 0;
393: /*
1.386 djm 394: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 395: * a proxy or jump host unless the user specifically requests so.
1.385 djm 396: */
1.443 djm 397: if (!direct &&
1.386 djm 398: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 399: return 0;
1.540 djm 400: debug3_f("check \"%s\" CNAME \"%s\"", *namep, cname);
1.385 djm 401: for (i = 0; i < options.num_permitted_cnames; i++) {
402: rule = options.permitted_cnames + i;
1.418 djm 403: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
404: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 405: continue;
1.386 djm 406: verbose("Canonicalized DNS aliased hostname "
1.385 djm 407: "\"%s\" => \"%s\"", *namep, cname);
408: free(*namep);
409: *namep = xstrdup(cname);
410: return 1;
411: }
412: return 0;
413: }
414:
415: /*
416: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 417: * canonicalization rules. Returns the address list for the host or NULL
418: * if no name was found after canonicalization.
1.400 djm 419: * NB. this function must operate with a options having undefined members.
1.385 djm 420: */
421: static struct addrinfo *
1.400 djm 422: resolve_canonicalize(char **hostp, int port)
1.385 djm 423: {
1.443 djm 424: int i, direct, ndots;
1.413 djm 425: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 426: struct addrinfo *addrs;
427:
428: /*
1.470 djm 429: * Attempt to canonicalise addresses, regardless of
430: * whether hostname canonicalisation was requested
1.385 djm 431: */
1.413 djm 432: if ((addrs = resolve_addr(*hostp, port,
433: newname, sizeof(newname))) != NULL) {
1.540 djm 434: debug2_f("hostname %.100s is address", *hostp);
1.413 djm 435: if (strcasecmp(*hostp, newname) != 0) {
1.540 djm 436: debug2_f("canonicalised address \"%s\" => \"%s\"",
437: *hostp, newname);
1.413 djm 438: free(*hostp);
439: *hostp = xstrdup(newname);
440: }
441: return addrs;
442: }
443:
1.470 djm 444: /*
445: * If this looks like an address but didn't parse as one, it might
446: * be an address with an invalid interface scope. Skip further
447: * attempts at canonicalisation.
448: */
449: if (is_addr_fast(*hostp)) {
1.540 djm 450: debug_f("hostname %.100s is an unrecognised address", *hostp);
1.470 djm 451: return NULL;
452: }
453:
454: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
455: return NULL;
456:
457: /*
458: * Don't attempt to canonicalize names that will be interpreted by
459: * a proxy unless the user specifically requests so.
460: */
461: direct = option_clear_or_none(options.proxy_command) &&
462: options.jump_host == NULL;
463: if (!direct &&
464: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
465: return NULL;
466:
1.428 djm 467: /* If domain name is anchored, then resolve it now */
468: if ((*hostp)[strlen(*hostp) - 1] == '.') {
1.540 djm 469: debug3_f("name is fully qualified");
1.428 djm 470: fullhost = xstrdup(*hostp);
471: if ((addrs = resolve_host(fullhost, port, 0,
472: newname, sizeof(newname))) != NULL)
473: goto found;
474: free(fullhost);
475: goto notfound;
476: }
477:
1.387 djm 478: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 479: ndots = 0;
480: for (cp = *hostp; *cp != '\0'; cp++) {
481: if (*cp == '.')
482: ndots++;
483: }
1.386 djm 484: if (ndots > options.canonicalize_max_dots) {
1.540 djm 485: debug3_f("not canonicalizing hostname \"%s\" (max dots %d)",
486: *hostp, options.canonicalize_max_dots);
1.385 djm 487: return NULL;
488: }
489: /* Attempt each supplied suffix */
490: for (i = 0; i < options.num_canonical_domains; i++) {
491: xasprintf(&fullhost, "%s.%s.", *hostp,
492: options.canonical_domains[i]);
1.540 djm 493: debug3_f("attempting \"%s\" => \"%s\"", *hostp, fullhost);
1.400 djm 494: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 495: newname, sizeof(newname))) == NULL) {
1.385 djm 496: free(fullhost);
497: continue;
498: }
1.428 djm 499: found:
1.385 djm 500: /* Remove trailing '.' */
501: fullhost[strlen(fullhost) - 1] = '\0';
502: /* Follow CNAME if requested */
1.443 djm 503: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 504: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 505: *hostp, fullhost);
506: }
507: free(*hostp);
508: *hostp = fullhost;
509: return addrs;
510: }
1.428 djm 511: notfound:
1.386 djm 512: if (!options.canonicalize_fallback_local)
1.400 djm 513: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
1.540 djm 514: debug2_f("host %s not found in any suffix", *hostp);
1.385 djm 515: return NULL;
516: }
517:
1.32 deraadt 518: /*
1.483 markus 519: * Check the result of hostkey loading, ignoring some errors and
520: * fatal()ing for others.
521: */
522: static void
523: check_load(int r, const char *path, const char *message)
524: {
525: switch (r) {
526: case 0:
527: break;
528: case SSH_ERR_INTERNAL_ERROR:
529: case SSH_ERR_ALLOC_FAIL:
1.540 djm 530: fatal_r(r, "load %s \"%s\"", message, path);
1.483 markus 531: case SSH_ERR_SYSTEM_ERROR:
532: /* Ignore missing files */
533: if (errno == ENOENT)
534: break;
535: /* FALLTHROUGH */
536: default:
1.540 djm 537: error_r(r, "load %s \"%s\"", message, path);
1.483 markus 538: break;
539: }
540: }
541:
542: /*
1.400 djm 543: * Read per-user configuration file. Ignore the system wide config
544: * file if the user specifies a config file on the command line.
545: */
546: static void
1.496 djm 547: process_config_files(const char *host_name, struct passwd *pw, int final_pass,
548: int *want_final_pass)
1.400 djm 549: {
1.414 deraadt 550: char buf[PATH_MAX];
1.400 djm 551: int r;
552:
553: if (config != NULL) {
554: if (strcasecmp(config, "none") != 0 &&
1.466 djm 555: !read_config_file(config, pw, host, host_name, &options,
1.496 djm 556: SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0),
557: want_final_pass))
1.400 djm 558: fatal("Can't open user config file %.100s: "
559: "%.100s", config, strerror(errno));
560: } else {
561: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
562: _PATH_SSH_USER_CONFFILE);
563: if (r > 0 && (size_t)r < sizeof(buf))
1.466 djm 564: (void)read_config_file(buf, pw, host, host_name,
1.408 djm 565: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
1.496 djm 566: (final_pass ? SSHCONF_FINAL : 0), want_final_pass);
1.400 djm 567:
568: /* Read systemwide configuration file after user config. */
1.408 djm 569: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
1.466 djm 570: host, host_name, &options,
1.496 djm 571: final_pass ? SSHCONF_FINAL : 0, want_final_pass);
1.408 djm 572: }
573: }
574:
575: /* Rewrite the port number in an addrinfo list of addresses */
576: static void
577: set_addrinfo_port(struct addrinfo *addrs, int port)
578: {
579: struct addrinfo *addr;
580:
581: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
582: switch (addr->ai_family) {
583: case AF_INET:
584: ((struct sockaddr_in *)addr->ai_addr)->
585: sin_port = htons(port);
586: break;
587: case AF_INET6:
588: ((struct sockaddr_in6 *)addr->ai_addr)->
589: sin6_port = htons(port);
590: break;
591: }
1.400 djm 592: }
593: }
594:
1.544 djm 595: static void
596: ssh_conn_info_free(struct ssh_conn_info *cinfo)
597: {
598: if (cinfo == NULL)
599: return;
600: free(cinfo->conn_hash_hex);
601: free(cinfo->shorthost);
602: free(cinfo->uidstr);
603: free(cinfo->keyalias);
604: free(cinfo->thishost);
605: free(cinfo->host_arg);
606: free(cinfo->portstr);
607: free(cinfo->remhost);
608: free(cinfo->remuser);
609: free(cinfo->homedir);
610: free(cinfo->locuser);
611: free(cinfo);
612: }
613:
1.400 djm 614: /*
1.32 deraadt 615: * Main program for the ssh client.
616: */
1.2 provos 617: int
618: main(int ac, char **av)
1.1 deraadt 619: {
1.437 djm 620: struct ssh *ssh = NULL;
1.462 djm 621: int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
1.496 djm 622: int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
1.544 djm 623: char *p, *cp, *line, *argv0, *logfile, *host_arg;
624: char cname[NI_MAXHOST], thishost[NI_MAXHOST];
1.31 markus 625: struct stat st;
1.98 markus 626: struct passwd *pw;
1.144 stevesk 627: extern int optind, optreset;
628: extern char *optarg;
1.406 millert 629: struct Forward fwd;
1.385 djm 630: struct addrinfo *addrs = NULL;
1.513 dtucker 631: size_t n, len;
1.532 dtucker 632: u_int j;
1.544 djm 633: struct ssh_conn_info *cinfo = NULL;
1.250 djm 634:
635: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
636: sanitise_stdfd();
1.31 markus 637:
1.33 markus 638: /*
1.346 djm 639: * Discard other fds that are hanging around. These can cause problem
640: * with backgrounded ssh processes started by ControlPersist.
641: */
642: closefrom(STDERR_FILENO + 1);
643:
1.487 dtucker 644: if (getuid() != geteuid())
645: fatal("ssh setuid not supported.");
646: if (getgid() != getegid())
647: fatal("ssh setgid not supported.");
1.184 stevesk 648:
1.107 markus 649: /* Get user data. */
1.490 dtucker 650: pw = getpwuid(getuid());
1.107 markus 651: if (!pw) {
1.490 dtucker 652: logit("No user exists for uid %lu", (u_long)getuid());
1.257 dtucker 653: exit(255);
1.107 markus 654: }
655: /* Take a copy of the returned structure. */
656: pw = pwcopy(pw);
1.31 markus 657:
1.33 markus 658: /*
659: * Set our umask to something reasonable, as some files are created
660: * with the default umask. This will make them world-readable but
661: * writable only by the owner, which is ok for all files for which we
662: * don't set the modes explicitly.
663: */
1.31 markus 664: umask(022);
1.445 djm 665:
666: setlocale(LC_CTYPE, "");
1.31 markus 667:
1.316 djm 668: /*
669: * Initialize option structure to indicate that no values have been
670: * set.
671: */
1.31 markus 672: initialize_options(&options);
673:
1.463 djm 674: /*
675: * Prepare main ssh transport/connection structures
676: */
677: if ((ssh = ssh_alloc_session_state()) == NULL)
678: fatal("Couldn't allocate session state");
679: channel_init_channels(ssh);
680:
1.31 markus 681: /* Parse command-line arguments. */
682: host = NULL;
1.320 djm 683: use_syslog = 0;
1.375 dtucker 684: logfile = NULL;
1.325 markus 685: argv0 = av[0];
1.31 markus 686:
1.266 djm 687: again:
1.316 djm 688: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.474 djm 689: "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 690: switch (opt) {
1.91 jakob 691: case '1':
1.454 djm 692: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 693: break;
1.47 markus 694: case '2':
1.454 djm 695: /* Ignored */
1.47 markus 696: break;
1.37 markus 697: case '4':
1.196 djm 698: options.address_family = AF_INET;
1.37 markus 699: break;
700: case '6':
1.196 djm 701: options.address_family = AF_INET6;
1.37 markus 702: break;
1.31 markus 703: case 'n':
704: stdin_null_flag = 1;
705: break;
706: case 'f':
707: fork_after_authentication_flag = 1;
708: stdin_null_flag = 1;
709: break;
710: case 'x':
711: options.forward_x11 = 0;
712: break;
713: case 'X':
714: options.forward_x11 = 1;
715: break;
1.320 djm 716: case 'y':
717: use_syslog = 1;
718: break;
1.375 dtucker 719: case 'E':
1.422 dtucker 720: logfile = optarg;
1.375 dtucker 721: break;
1.408 djm 722: case 'G':
723: config_test = 1;
724: break;
1.202 markus 725: case 'Y':
726: options.forward_x11 = 1;
727: options.forward_x11_trusted = 1;
728: break;
1.31 markus 729: case 'g':
1.406 millert 730: options.fwd_opts.gateway_ports = 1;
1.31 markus 731: break;
1.229 djm 732: case 'O':
1.441 dtucker 733: if (options.stdio_forward_host != NULL)
1.332 djm 734: fatal("Cannot specify multiplexing "
735: "command with -W");
736: else if (muxclient_command != 0)
737: fatal("Multiplexing command already specified");
1.229 djm 738: if (strcmp(optarg, "check") == 0)
1.312 djm 739: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 740: else if (strcmp(optarg, "forward") == 0)
741: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 742: else if (strcmp(optarg, "exit") == 0)
1.312 djm 743: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 744: else if (strcmp(optarg, "stop") == 0)
745: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 746: else if (strcmp(optarg, "cancel") == 0)
747: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 748: else if (strcmp(optarg, "proxy") == 0)
749: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 750: else
751: fatal("Invalid multiplex command.");
752: break;
1.183 stevesk 753: case 'P': /* deprecated */
1.376 djm 754: break;
1.394 deraadt 755: case 'Q':
1.376 djm 756: cp = NULL;
1.519 dtucker 757: if (strcmp(optarg, "cipher") == 0 ||
758: strcasecmp(optarg, "Ciphers") == 0)
1.393 djm 759: cp = cipher_alg_list('\n', 0);
1.394 deraadt 760: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 761: cp = cipher_alg_list('\n', 1);
1.519 dtucker 762: else if (strcmp(optarg, "mac") == 0 ||
763: strcasecmp(optarg, "MACs") == 0)
1.392 dtucker 764: cp = mac_alg_list('\n');
1.519 dtucker 765: else if (strcmp(optarg, "kex") == 0 ||
766: strcasecmp(optarg, "KexAlgorithms") == 0)
1.392 dtucker 767: cp = kex_alg_list('\n');
1.394 deraadt 768: else if (strcmp(optarg, "key") == 0)
1.451 djm 769: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 770: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 771: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 772: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 773: cp = sshkey_alg_list(0, 1, 0, '\n');
1.519 dtucker 774: else if (strcmp(optarg, "key-sig") == 0 ||
1.547 dtucker 775: strcasecmp(optarg, "PubkeyAcceptedKeyTypes") == 0 || /* deprecated name */
776: strcasecmp(optarg, "PubkeyAcceptedAlgorithms") == 0 ||
1.519 dtucker 777: strcasecmp(optarg, "HostKeyAlgorithms") == 0 ||
1.548 dtucker 778: strcasecmp(optarg, "HostbasedKeyTypes") == 0 || /* deprecated name */
779: strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 0 || /* deprecated name */
780: strcasecmp(optarg, "HostbasedAcceptedAlgorithms") == 0)
1.519 dtucker 781: cp = sshkey_alg_list(0, 0, 1, '\n');
1.491 djm 782: else if (strcmp(optarg, "sig") == 0)
1.492 djm 783: cp = sshkey_alg_list(0, 1, 1, '\n');
1.491 djm 784: else if (strcmp(optarg, "protocol-version") == 0)
1.416 djm 785: cp = xstrdup("2");
1.513 dtucker 786: else if (strcmp(optarg, "compression") == 0) {
787: cp = xstrdup(compression_alg_list(0));
788: len = strlen(cp);
789: for (n = 0; n < len; n++)
790: if (cp[n] == ',')
791: cp[n] = '\n';
792: } else if (strcmp(optarg, "help") == 0) {
1.491 djm 793: cp = xstrdup(
1.513 dtucker 794: "cipher\ncipher-auth\ncompression\nkex\n"
1.519 dtucker 795: "key\nkey-cert\nkey-plain\nkey-sig\nmac\n"
1.491 djm 796: "protocol-version\nsig");
1.416 djm 797: }
1.376 djm 798: if (cp == NULL)
799: fatal("Unsupported query \"%s\"", optarg);
800: printf("%s\n", cp);
801: free(cp);
802: exit(0);
1.31 markus 803: break;
804: case 'a':
805: options.forward_agent = 0;
1.53 markus 806: break;
807: case 'A':
808: options.forward_agent = 1;
1.31 markus 809: break;
810: case 'k':
1.204 dtucker 811: options.gss_deleg_creds = 0;
1.297 djm 812: break;
813: case 'K':
814: options.gss_authentication = 1;
815: options.gss_deleg_creds = 1;
1.31 markus 816: break;
817: case 'i':
1.490 dtucker 818: p = tilde_expand_filename(optarg, getuid());
1.505 deraadt 819: if (stat(p, &st) == -1)
1.128 fgsch 820: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 821: "not accessible: %s.\n", p,
1.231 otto 822: strerror(errno));
1.429 dtucker 823: else
824: add_identity_file(&options, NULL, p, 1);
825: free(p);
1.31 markus 826: break;
1.127 markus 827: case 'I':
1.333 markus 828: #ifdef ENABLE_PKCS11
1.422 dtucker 829: free(options.pkcs11_provider);
1.333 markus 830: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 831: #else
1.333 markus 832: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 833: #endif
1.127 markus 834: break;
1.443 djm 835: case 'J':
1.504 djm 836: if (options.jump_host != NULL) {
837: fatal("Only a single -J option is permitted "
838: "(use commas to separate multiple "
839: "jump hops)");
840: }
1.443 djm 841: if (options.proxy_command != NULL)
842: fatal("Cannot specify -J with ProxyCommand");
843: if (parse_jump(optarg, &options, 1) == -1)
844: fatal("Invalid -J argument");
845: options.proxy_command = xstrdup("none");
846: break;
1.31 markus 847: case 't':
1.359 djm 848: if (options.request_tty == REQUEST_TTY_YES)
849: options.request_tty = REQUEST_TTY_FORCE;
850: else
851: options.request_tty = REQUEST_TTY_YES;
1.31 markus 852: break;
853: case 'v':
1.197 markus 854: if (debug_flag == 0) {
1.66 markus 855: debug_flag = 1;
856: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 857: } else {
1.443 djm 858: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
859: debug_flag++;
1.197 markus 860: options.log_level++;
1.443 djm 861: }
1.197 markus 862: }
1.375 dtucker 863: break;
1.31 markus 864: case 'V':
1.209 markus 865: fprintf(stderr, "%s, %s\n",
1.541 dtucker 866: SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 867: if (opt == 'V')
868: exit(0);
869: break;
1.255 reyk 870: case 'w':
1.256 reyk 871: if (options.tun_open == -1)
872: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 873: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 874: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 875: fprintf(stderr,
876: "Bad tun device '%s'\n", optarg);
1.257 dtucker 877: exit(255);
1.255 reyk 878: }
879: break;
1.331 dtucker 880: case 'W':
1.441 dtucker 881: if (options.stdio_forward_host != NULL)
1.332 djm 882: fatal("stdio forward already specified");
883: if (muxclient_command != 0)
884: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 885: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 886: options.stdio_forward_host = fwd.listen_host;
887: options.stdio_forward_port = fwd.listen_port;
1.378 djm 888: free(fwd.connect_host);
1.331 dtucker 889: } else {
890: fprintf(stderr,
891: "Bad stdio forwarding specification '%s'\n",
892: optarg);
893: exit(255);
894: }
1.359 djm 895: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 896: no_shell_flag = 1;
897: break;
1.31 markus 898: case 'q':
899: options.log_level = SYSLOG_LEVEL_QUIET;
900: break;
901: case 'e':
902: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 903: (u_char) optarg[1] >= 64 &&
904: (u_char) optarg[1] < 128)
1.78 markus 905: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 906: else if (strlen(optarg) == 1)
1.78 markus 907: options.escape_char = (u_char) optarg[0];
1.31 markus 908: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 909: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 910: else {
1.128 fgsch 911: fprintf(stderr, "Bad escape character '%s'.\n",
912: optarg);
1.257 dtucker 913: exit(255);
1.31 markus 914: }
915: break;
916: case 'c':
1.506 naddy 917: if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
1.420 djm 918: optarg + 1 : optarg)) {
919: fprintf(stderr, "Unknown cipher type '%s'\n",
920: optarg);
921: exit(255);
1.95 markus 922: }
1.456 djm 923: free(options.ciphers);
924: options.ciphers = xstrdup(optarg);
1.95 markus 925: break;
926: case 'm':
1.422 dtucker 927: if (mac_valid(optarg)) {
928: free(options.macs);
1.95 markus 929: options.macs = xstrdup(optarg);
1.422 dtucker 930: } else {
1.128 fgsch 931: fprintf(stderr, "Unknown mac type '%s'\n",
932: optarg);
1.257 dtucker 933: exit(255);
1.31 markus 934: }
935: break;
1.214 djm 936: case 'M':
1.242 djm 937: if (options.control_master == SSHCTL_MASTER_YES)
938: options.control_master = SSHCTL_MASTER_ASK;
939: else
940: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 941: break;
1.31 markus 942: case 'p':
1.465 millert 943: if (options.port == -1) {
944: options.port = a2port(optarg);
945: if (options.port <= 0) {
946: fprintf(stderr, "Bad port '%s'\n",
947: optarg);
948: exit(255);
949: }
1.109 markus 950: }
1.31 markus 951: break;
952: case 'l':
1.465 millert 953: if (options.user == NULL)
954: options.user = optarg;
1.31 markus 955: break;
1.141 stevesk 956:
957: case 'L':
1.324 djm 958: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 959: add_local_forward(&options, &fwd);
960: else {
1.128 fgsch 961: fprintf(stderr,
1.232 djm 962: "Bad local forwarding specification '%s'\n",
1.128 fgsch 963: optarg);
1.257 dtucker 964: exit(255);
1.31 markus 965: }
1.232 djm 966: break;
967:
968: case 'R':
1.464 markus 969: if (parse_forward(&fwd, optarg, 0, 1) ||
970: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 971: add_remote_forward(&options, &fwd);
972: } else {
1.128 fgsch 973: fprintf(stderr,
1.232 djm 974: "Bad remote forwarding specification "
975: "'%s'\n", optarg);
1.257 dtucker 976: exit(255);
1.31 markus 977: }
978: break;
1.108 markus 979:
980: case 'D':
1.324 djm 981: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 982: add_local_forward(&options, &fwd);
1.232 djm 983: } else {
1.322 stevesk 984: fprintf(stderr,
985: "Bad dynamic forwarding specification "
986: "'%s'\n", optarg);
1.257 dtucker 987: exit(255);
1.109 markus 988: }
1.108 markus 989: break;
990:
1.31 markus 991: case 'C':
1.513 dtucker 992: #ifdef WITH_ZLIB
1.31 markus 993: options.compression = 1;
1.513 dtucker 994: #else
995: error("Compression not supported, disabling.");
996: #endif
1.31 markus 997: break;
1.45 markus 998: case 'N':
999: no_shell_flag = 1;
1.359 djm 1000: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1001: break;
1002: case 'T':
1.359 djm 1003: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1004: break;
1.31 markus 1005: case 'o':
1.205 markus 1006: line = xstrdup(optarg);
1.408 djm 1007: if (process_config_line(&options, pw,
1008: host ? host : "", host ? host : "", line,
1009: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 1010: exit(255);
1.378 djm 1011: free(line);
1.31 markus 1012: break;
1.85 djm 1013: case 's':
1014: subsystem_flag = 1;
1.117 markus 1015: break;
1.214 djm 1016: case 'S':
1.431 mmcc 1017: free(options.control_path);
1.214 djm 1018: options.control_path = xstrdup(optarg);
1019: break;
1.117 markus 1020: case 'b':
1021: options.bind_address = optarg;
1.474 djm 1022: break;
1023: case 'B':
1024: options.bind_interface = optarg;
1.85 djm 1025: break;
1.139 markus 1026: case 'F':
1027: config = optarg;
1028: break;
1.31 markus 1029: default:
1030: usage();
1.1 deraadt 1031: }
1.31 markus 1032: }
1033:
1.462 djm 1034: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
1035: opt_terminated = 1;
1036:
1.128 fgsch 1037: ac -= optind;
1038: av += optind;
1039:
1.329 guenther 1040: if (ac > 0 && !host) {
1.465 millert 1041: int tport;
1042: char *tuser;
1043: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
1044: case -1:
1045: usage();
1046: break;
1047: case 0:
1048: if (options.user == NULL) {
1049: options.user = tuser;
1050: tuser = NULL;
1051: }
1052: free(tuser);
1053: if (options.port == -1 && tport != -1)
1054: options.port = tport;
1055: break;
1056: default:
1.128 fgsch 1057: p = xstrdup(*av);
1.188 markus 1058: cp = strrchr(p, '@');
1.465 millert 1059: if (cp != NULL) {
1060: if (cp == p)
1061: usage();
1062: if (options.user == NULL) {
1063: options.user = p;
1064: p = NULL;
1065: }
1066: *cp++ = '\0';
1067: host = xstrdup(cp);
1068: free(p);
1069: } else
1070: host = p;
1071: break;
1072: }
1.462 djm 1073: if (ac > 1 && !opt_terminated) {
1.189 millert 1074: optind = optreset = 1;
1.128 fgsch 1075: goto again;
1076: }
1.189 millert 1077: ac--, av++;
1.128 fgsch 1078: }
1079:
1.31 markus 1080: /* Check that we got a host name. */
1081: if (!host)
1082: usage();
1083:
1.385 djm 1084: host_arg = xstrdup(host);
1085:
1.402 markus 1086: #ifdef WITH_OPENSSL
1.350 djm 1087: OpenSSL_add_all_algorithms();
1.72 markus 1088: ERR_load_crypto_strings();
1.402 markus 1089: #endif
1.31 markus 1090:
1091: /* Initialize the command to execute on remote host. */
1.482 markus 1092: if ((command = sshbuf_new()) == NULL)
1093: fatal("sshbuf_new failed");
1.1 deraadt 1094:
1.33 markus 1095: /*
1096: * Save the command to execute on the remote host in a buffer. There
1097: * is no limit on the length of the command, except by the maximum
1098: * packet size. Also sets the tty flag if there is no command.
1099: */
1.128 fgsch 1100: if (!ac) {
1.31 markus 1101: /* No command specified - execute shell on a tty. */
1.85 djm 1102: if (subsystem_flag) {
1.128 fgsch 1103: fprintf(stderr,
1104: "You must specify a subsystem to invoke.\n");
1.85 djm 1105: usage();
1106: }
1.31 markus 1107: } else {
1.128 fgsch 1108: /* A command has been specified. Store it into the buffer. */
1109: for (i = 0; i < ac; i++) {
1.482 markus 1110: if ((r = sshbuf_putf(command, "%s%s",
1111: i ? " " : "", av[i])) != 0)
1.540 djm 1112: fatal_fr(r, "buffer error");
1.31 markus 1113: }
1114: }
1115:
1.101 markus 1116: /*
1117: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1118: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1119: */
1.375 dtucker 1120: if (use_syslog && logfile != NULL)
1121: fatal("Can't specify both -y and -E");
1.422 dtucker 1122: if (logfile != NULL)
1.375 dtucker 1123: log_redirect_stderr_to(logfile);
1.325 markus 1124: log_init(argv0,
1.468 djm 1125: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1126: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1127: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1128: SYSLOG_FACILITY_USER : options.log_facility,
1129: !use_syslog);
1.375 dtucker 1130:
1131: if (debug_flag)
1.541 dtucker 1132: logit("%s, %s", SSH_VERSION, SSH_OPENSSL_VERSION);
1.31 markus 1133:
1.400 djm 1134: /* Parse the configuration files */
1.496 djm 1135: process_config_files(host_arg, pw, 0, &want_final_pass);
1136: if (want_final_pass)
1137: debug("configuration requests final Match pass");
1.400 djm 1138:
1139: /* Hostname canonicalisation needs a few options filled. */
1140: fill_default_options_for_canonicalization(&options);
1141:
1142: /* If the user has replaced the hostname then take it into use now */
1143: if (options.hostname != NULL) {
1144: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1145: cp = percent_expand(options.hostname,
1146: "h", host, (char *)NULL);
1147: free(host);
1148: host = cp;
1.408 djm 1149: free(options.hostname);
1150: options.hostname = xstrdup(host);
1.400 djm 1151: }
1152:
1.470 djm 1153: /* Don't lowercase addresses, they will be explicitly canonicalised */
1154: if ((was_addr = is_addr(host)) == 0)
1155: lowercase(host);
1156:
1157: /*
1158: * Try to canonicalize if requested by configuration or the
1159: * hostname is an address.
1160: */
1161: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1162: addrs = resolve_canonicalize(&host, options.port);
1163:
1.139 markus 1164: /*
1.401 djm 1165: * If CanonicalizePermittedCNAMEs have been specified but
1166: * other canonicalization did not happen (by not being requested
1167: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1168: * as a result of CNAME following.
1.401 djm 1169: *
1170: * Try to resolve the bare hostname name using the system resolver's
1171: * usual search rules and then apply the CNAME follow rules.
1172: *
1173: * Skip the lookup if a ProxyCommand is being used unless the user
1174: * has specifically requested canonicalisation for this case via
1175: * CanonicalizeHostname=always
1.139 markus 1176: */
1.443 djm 1177: direct = option_clear_or_none(options.proxy_command) &&
1178: options.jump_host == NULL;
1179: if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1180: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1181: if ((addrs = resolve_host(host, options.port,
1.493 djm 1182: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1183: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1184: if (direct)
1.403 djm 1185: cleanup_exit(255); /* logged in resolve_host */
1186: } else
1.443 djm 1187: check_follow_cname(direct, &host, cname);
1.400 djm 1188: }
1.139 markus 1189:
1.400 djm 1190: /*
1.408 djm 1191: * If canonicalisation is enabled then re-parse the configuration
1192: * files as new stanzas may match.
1.400 djm 1193: */
1.496 djm 1194: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1195: debug("hostname canonicalisation enabled, "
1196: "will re-parse configuration");
1197: want_final_pass = 1;
1198: }
1199:
1200: if (want_final_pass) {
1201: debug("re-parsing configuration");
1.408 djm 1202: free(options.hostname);
1203: options.hostname = xstrdup(host);
1.496 djm 1204: process_config_files(host_arg, pw, 1, NULL);
1.408 djm 1205: /*
1206: * Address resolution happens early with canonicalisation
1207: * enabled and the port number may have changed since, so
1208: * reset it in address list
1209: */
1210: if (addrs != NULL && options.port > 0)
1211: set_addrinfo_port(addrs, options.port);
1.139 markus 1212: }
1.31 markus 1213:
1214: /* Fill configuration defaults. */
1.543 djm 1215: if (fill_default_options(&options) != 0)
1216: cleanup_exit(255);
1.443 djm 1217:
1.534 dtucker 1218: if (options.user == NULL)
1219: options.user = xstrdup(pw->pw_name);
1220:
1.443 djm 1221: /*
1222: * If ProxyJump option specified, then construct a ProxyCommand now.
1223: */
1224: if (options.jump_host != NULL) {
1225: char port_s[8];
1.534 dtucker 1226: const char *jumpuser = options.jump_user, *sshbin = argv0;
1.520 dtucker 1227: int port = options.port, jumpport = options.jump_port;
1228:
1229: if (port <= 0)
1230: port = default_ssh_port();
1231: if (jumpport <= 0)
1232: jumpport = default_ssh_port();
1.534 dtucker 1233: if (jumpuser == NULL)
1234: jumpuser = options.user;
1235: if (strcmp(options.jump_host, host) == 0 && port == jumpport &&
1236: strcmp(options.user, jumpuser) == 0)
1.520 dtucker 1237: fatal("jumphost loop via %s", options.jump_host);
1.478 djm 1238:
1239: /*
1240: * Try to use SSH indicated by argv[0], but fall back to
1241: * "ssh" if it appears unavailable.
1242: */
1243: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1244: sshbin = "ssh";
1.443 djm 1245:
1246: /* Consistency check */
1247: if (options.proxy_command != NULL)
1248: fatal("inconsistent options: ProxyCommand+ProxyJump");
1249: /* Never use FD passing for ProxyJump */
1250: options.proxy_use_fdpass = 0;
1251: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1252: xasprintf(&options.proxy_command,
1.478 djm 1253: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1254: sshbin,
1.443 djm 1255: /* Optional "-l user" argument if jump_user set */
1256: options.jump_user == NULL ? "" : " -l ",
1257: options.jump_user == NULL ? "" : options.jump_user,
1258: /* Optional "-p port" argument if jump_port set */
1259: options.jump_port <= 0 ? "" : " -p ",
1260: options.jump_port <= 0 ? "" : port_s,
1261: /* Optional additional jump hosts ",..." */
1262: options.jump_extra == NULL ? "" : " -J ",
1263: options.jump_extra == NULL ? "" : options.jump_extra,
1264: /* Optional "-F" argumment if -F specified */
1265: config == NULL ? "" : " -F ",
1266: config == NULL ? "" : config,
1267: /* Optional "-v" arguments if -v set */
1268: debug_flag ? " -" : "",
1269: debug_flag, "vvv",
1270: /* Mandatory hostname */
1271: options.jump_host);
1272: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1273: options.proxy_command);
1274: }
1.31 markus 1275:
1.400 djm 1276: if (options.port == 0)
1277: options.port = default_ssh_port();
1.463 djm 1278: channel_set_af(ssh, options.address_family);
1.196 djm 1279:
1.383 djm 1280: /* Tidy and check options */
1281: if (options.host_key_alias != NULL)
1282: lowercase(options.host_key_alias);
1283: if (options.proxy_command != NULL &&
1284: strcmp(options.proxy_command, "-") == 0 &&
1285: options.proxy_use_fdpass)
1286: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.516 markus 1287: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1288: if (options.control_persist && options.control_path != NULL) {
1289: debug("UpdateHostKeys=ask is incompatible with "
1290: "ControlPersist; disabling");
1291: options.update_hostkeys = 0;
1292: } else if (sshbuf_len(command) != 0 ||
1293: options.remote_command != NULL ||
1294: options.request_tty == REQUEST_TTY_NO) {
1295: debug("UpdateHostKeys=ask is incompatible with "
1296: "remote command execution; disabling");
1.517 djm 1297: options.update_hostkeys = 0;
1298: } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1299: /* no point logging anything; user won't see it */
1.516 markus 1300: options.update_hostkeys = 0;
1301: }
1.415 djm 1302: }
1.430 djm 1303: if (options.connection_attempts <= 0)
1304: fatal("Invalid number of ConnectionAttempts");
1305:
1.482 markus 1306: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1307: fatal("Cannot execute command-line and remote command.");
1308:
1309: /* Cannot fork to background if no command. */
1.482 markus 1310: if (fork_after_authentication_flag && sshbuf_len(command) == 0 &&
1.461 bluhm 1311: options.remote_command == NULL && !no_shell_flag)
1312: fatal("Cannot fork into background without a command "
1313: "to execute.");
1314:
1.31 markus 1315: /* reinit */
1.452 dtucker 1316: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.539 djm 1317: for (j = 0; j < options.num_log_verbose; j++)
1318: log_verbose_add(options.log_verbose[j]);
1.370 djm 1319:
1320: if (options.request_tty == REQUEST_TTY_YES ||
1321: options.request_tty == REQUEST_TTY_FORCE)
1322: tty_flag = 1;
1323:
1324: /* Allocate a tty by default if no command specified. */
1.482 markus 1325: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1326: tty_flag = options.request_tty != REQUEST_TTY_NO;
1327:
1328: /* Force no tty */
1.447 markus 1329: if (options.request_tty == REQUEST_TTY_NO ||
1330: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
1.370 djm 1331: tty_flag = 0;
1332: /* Do not allocate a tty if stdin is not a tty. */
1333: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1334: options.request_tty != REQUEST_TTY_FORCE) {
1335: if (tty_flag)
1336: logit("Pseudo-terminal will not be allocated because "
1337: "stdin is not a terminal.");
1338: tty_flag = 0;
1339: }
1.343 djm 1340:
1.466 djm 1341: /* Set up strings used to percent_expand() arguments */
1.544 djm 1342: cinfo = xcalloc(1, sizeof(*cinfo));
1.358 djm 1343: if (gethostname(thishost, sizeof(thishost)) == -1)
1344: fatal("gethostname: %s", strerror(errno));
1.544 djm 1345: cinfo->thishost = xstrdup(thishost);
1346: thishost[strcspn(thishost, ".")] = '\0';
1347: cinfo->shorthost = xstrdup(thishost);
1348: xasprintf(&cinfo->portstr, "%d", options.port);
1349: xasprintf(&cinfo->uidstr, "%llu",
1.479 djm 1350: (unsigned long long)pw->pw_uid);
1.544 djm 1351: cinfo->keyalias = xstrdup(options.host_key_alias ?
1352: options.host_key_alias : host_arg);
1353: cinfo->conn_hash_hex = ssh_connection_hash(cinfo->thishost, host,
1354: cinfo->portstr, options.user);
1355: cinfo->host_arg = xstrdup(host_arg);
1356: cinfo->remhost = xstrdup(host);
1357: cinfo->remuser = xstrdup(options.user);
1358: cinfo->homedir = xstrdup(pw->pw_dir);
1359: cinfo->locuser = xstrdup(pw->pw_name);
1.405 djm 1360:
1.466 djm 1361: /*
1362: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1363: * after port-forwarding is set up, so it may pick up any local
1364: * tunnel interface name allocated.
1365: */
1.461 bluhm 1366: if (options.remote_command != NULL) {
1367: debug3("expanding RemoteCommand: %s", options.remote_command);
1368: cp = options.remote_command;
1.527 dtucker 1369: options.remote_command = default_client_percent_expand(cp,
1.544 djm 1370: cinfo);
1.461 bluhm 1371: debug3("expanded RemoteCommand: %s", options.remote_command);
1372: free(cp);
1.482 markus 1373: if ((r = sshbuf_put(command, options.remote_command,
1374: strlen(options.remote_command))) != 0)
1.540 djm 1375: fatal_fr(r, "buffer error");
1.304 dtucker 1376: }
1.31 markus 1377:
1.214 djm 1378: if (options.control_path != NULL) {
1.490 dtucker 1379: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1380: free(options.control_path);
1.528 dtucker 1381: options.control_path = default_client_percent_dollar_expand(cp,
1.544 djm 1382: cinfo);
1.378 djm 1383: free(cp);
1.214 djm 1384: }
1.408 djm 1385:
1.522 dtucker 1386: if (options.identity_agent != NULL) {
1387: p = tilde_expand_filename(options.identity_agent, getuid());
1.544 djm 1388: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1389: free(p);
1390: free(options.identity_agent);
1391: options.identity_agent = cp;
1392: }
1393:
1394: if (options.forward_agent_sock_path != NULL) {
1395: p = tilde_expand_filename(options.forward_agent_sock_path,
1396: getuid());
1.544 djm 1397: cp = default_client_percent_dollar_expand(p, cinfo);
1.522 dtucker 1398: free(p);
1399: free(options.forward_agent_sock_path);
1400: options.forward_agent_sock_path = cp;
1.532 dtucker 1401: }
1402:
1.545 djm 1403: if (options.num_system_hostfiles > 0 &&
1404: strcasecmp(options.system_hostfiles[0], "none") == 0) {
1405: if (options.num_system_hostfiles > 1)
1406: fatal("Invalid GlobalKnownHostsFiles: \"none\" "
1407: "appears with other entries");
1408: free(options.system_hostfiles[0]);
1409: options.system_hostfiles[0] = NULL;
1410: options.num_system_hostfiles = 0;
1411: }
1412:
1413: if (options.num_user_hostfiles > 0 &&
1414: strcasecmp(options.user_hostfiles[0], "none") == 0) {
1415: if (options.num_user_hostfiles > 1)
1416: fatal("Invalid UserKnownHostsFiles: \"none\" "
1417: "appears with other entries");
1418: free(options.user_hostfiles[0]);
1419: options.user_hostfiles[0] = NULL;
1420: options.num_user_hostfiles = 0;
1421: }
1.532 dtucker 1422: for (j = 0; j < options.num_user_hostfiles; j++) {
1.545 djm 1423: if (options.user_hostfiles[j] == NULL)
1424: continue;
1425: cp = tilde_expand_filename(options.user_hostfiles[j], getuid());
1426: p = default_client_percent_dollar_expand(cp, cinfo);
1427: if (strcmp(options.user_hostfiles[j], p) != 0)
1428: debug3("expanded UserKnownHostsFile '%s' -> "
1429: "'%s'", options.user_hostfiles[j], p);
1430: free(options.user_hostfiles[j]);
1431: free(cp);
1432: options.user_hostfiles[j] = p;
1.522 dtucker 1433: }
1434:
1.527 dtucker 1435: for (i = 0; i < options.num_local_forwards; i++) {
1436: if (options.local_forwards[i].listen_path != NULL) {
1437: cp = options.local_forwards[i].listen_path;
1438: p = options.local_forwards[i].listen_path =
1.544 djm 1439: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1440: if (strcmp(cp, p) != 0)
1441: debug3("expanded LocalForward listen path "
1442: "'%s' -> '%s'", cp, p);
1443: free(cp);
1444: }
1445: if (options.local_forwards[i].connect_path != NULL) {
1446: cp = options.local_forwards[i].connect_path;
1447: p = options.local_forwards[i].connect_path =
1.544 djm 1448: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1449: if (strcmp(cp, p) != 0)
1450: debug3("expanded LocalForward connect path "
1451: "'%s' -> '%s'", cp, p);
1452: free(cp);
1453: }
1454: }
1455:
1456: for (i = 0; i < options.num_remote_forwards; i++) {
1457: if (options.remote_forwards[i].listen_path != NULL) {
1458: cp = options.remote_forwards[i].listen_path;
1459: p = options.remote_forwards[i].listen_path =
1.544 djm 1460: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1461: if (strcmp(cp, p) != 0)
1462: debug3("expanded RemoteForward listen path "
1463: "'%s' -> '%s'", cp, p);
1464: free(cp);
1465: }
1466: if (options.remote_forwards[i].connect_path != NULL) {
1467: cp = options.remote_forwards[i].connect_path;
1468: p = options.remote_forwards[i].connect_path =
1.544 djm 1469: default_client_percent_expand(cp, cinfo);
1.527 dtucker 1470: if (strcmp(cp, p) != 0)
1471: debug3("expanded RemoteForward connect path "
1472: "'%s' -> '%s'", cp, p);
1473: free(cp);
1474: }
1475: }
1476:
1.408 djm 1477: if (config_test) {
1478: dump_client_config(&options, host);
1479: exit(0);
1.508 djm 1480: }
1481:
1482: /* Expand SecurityKeyProvider if it refers to an environment variable */
1483: if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1484: strlen(options.sk_provider) > 1) {
1485: if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1.518 naddy 1486: debug("Authenticator provider %s did not resolve; "
1.508 djm 1487: "disabling", options.sk_provider);
1488: free(options.sk_provider);
1489: options.sk_provider = NULL;
1490: } else {
1491: debug2("resolved SecurityKeyProvider %s => %s",
1492: options.sk_provider, cp);
1493: free(options.sk_provider);
1494: options.sk_provider = xstrdup(cp);
1495: }
1.408 djm 1496: }
1.405 djm 1497:
1.312 djm 1498: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1499: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1500: if (options.control_path != NULL) {
1501: int sock;
1502: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1503: ssh_packet_set_connection(ssh, sock, sock);
1.499 djm 1504: ssh_packet_set_mux(ssh);
1.447 markus 1505: goto skip_connect;
1506: }
1507: }
1.401 djm 1508:
1509: /*
1510: * If hostname canonicalisation was not enabled, then we may not
1511: * have yet resolved the hostname. Do so now.
1512: */
1513: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1514: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1515: if ((addrs = resolve_host(host, options.port, 1,
1516: cname, sizeof(cname))) == NULL)
1517: cleanup_exit(255); /* resolve_host logs the error */
1518: }
1.214 djm 1519:
1.542 dtucker 1520: if (options.connection_timeout >= INT_MAX/1000)
1521: timeout_ms = INT_MAX;
1522: else
1523: timeout_ms = options.connection_timeout * 1000;
1.303 djm 1524:
1.77 markus 1525: /* Open a connection to the remote host. */
1.511 beck 1526: if (ssh_connect(ssh, host, host_arg, addrs, &hostaddr, options.port,
1.538 kn 1527: options.connection_attempts,
1.488 dtucker 1528: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1529: exit(255);
1.31 markus 1530:
1.391 djm 1531: if (addrs != NULL)
1532: freeaddrinfo(addrs);
1533:
1.499 djm 1534: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1535: options.server_alive_count_max);
1536:
1.303 djm 1537: if (timeout_ms > 0)
1538: debug3("timeout: %d ms remain after connect", timeout_ms);
1539:
1.33 markus 1540: /*
1.485 dtucker 1541: * If we successfully made the connection and we have hostbased auth
1542: * enabled, load the public keys so we can later use the ssh-keysign
1543: * helper to sign challenges.
1.33 markus 1544: */
1.112 markus 1545: sensitive_data.nkeys = 0;
1546: sensitive_data.keys = NULL;
1.457 djm 1547: if (options.hostbased_authentication) {
1.486 dtucker 1548: sensitive_data.nkeys = 10;
1.274 deraadt 1549: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.483 markus 1550: sizeof(struct sshkey));
1551:
1552: /* XXX check errors? */
1.486 dtucker 1553: #define L_PUBKEY(p,o) do { \
1554: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1555: fatal_f("pubkey out of array bounds"); \
1.483 markus 1556: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.486 dtucker 1557: p, "pubkey"); \
1558: } while (0)
1559: #define L_CERT(p,o) do { \
1560: if ((o) >= sensitive_data.nkeys) \
1.540 djm 1561: fatal_f("cert out of array bounds"); \
1.486 dtucker 1562: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), p, "cert"); \
1563: } while (0)
1.177 markus 1564:
1.485 dtucker 1565: if (options.hostbased_authentication == 1) {
1.486 dtucker 1566: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1567: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1568: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1569: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1570: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1571: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1572: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1573: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1574: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1575: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.173 markus 1576: }
1.367 djm 1577: }
1.31 markus 1578:
1.104 markus 1579: /* load options.identity_files */
1.544 djm 1580: load_public_identity_files(cinfo);
1.439 markus 1581:
1.476 djm 1582: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1583: if (options.identity_agent &&
1584: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1585: if (strcmp(options.identity_agent, "none") == 0) {
1586: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1587: } else {
1.522 dtucker 1588: cp = options.identity_agent;
1.528 dtucker 1589: /* legacy (limited) format */
1590: if (cp[0] == '$' && cp[1] != '{') {
1.494 djm 1591: if (!valid_env_name(cp + 1)) {
1592: fatal("Invalid IdentityAgent "
1593: "environment variable name %s", cp);
1594: }
1595: if ((p = getenv(cp + 1)) == NULL)
1596: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1597: else
1598: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1599: } else {
1600: /* identity_agent specifies a path directly */
1601: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1602: }
1.510 djm 1603: }
1604: }
1605:
1.522 dtucker 1606: if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1.526 djm 1607: cp = options.forward_agent_sock_path;
1.510 djm 1608: if (cp[0] == '$') {
1609: if (!valid_env_name(cp + 1)) {
1610: fatal("Invalid ForwardAgent environment variable name %s", cp);
1611: }
1612: if ((p = getenv(cp + 1)) != NULL)
1613: forward_agent_sock_path = p;
1614: else
1615: options.forward_agent = 0;
1616: free(cp);
1617: } else {
1618: forward_agent_sock_path = cp;
1.439 markus 1619: }
1620: }
1.104 markus 1621:
1622: /* Expand ~ in known host file names. */
1.361 djm 1623: tilde_expand_paths(options.system_hostfiles,
1624: options.num_system_hostfiles);
1625: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1626:
1.512 dtucker 1627: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1628: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1629:
1.316 djm 1630: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1631: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.546 djm 1632: options.port, pw, timeout_ms, cinfo);
1.339 djm 1633:
1.499 djm 1634: if (ssh_packet_connection_is_on_socket(ssh)) {
1.339 djm 1635: verbose("Authenticated to %s ([%s]:%d).", host,
1.437 djm 1636: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
1.339 djm 1637: } else {
1638: verbose("Authenticated to %s (via proxy).", host);
1639: }
1.31 markus 1640:
1.112 markus 1641: /* We no longer need the private host keys. Clear them now. */
1642: if (sensitive_data.nkeys != 0) {
1643: for (i = 0; i < sensitive_data.nkeys; i++) {
1644: if (sensitive_data.keys[i] != NULL) {
1645: /* Destroys contents safely */
1646: debug3("clear hostkey %d", i);
1.483 markus 1647: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1648: sensitive_data.keys[i] = NULL;
1649: }
1650: }
1.378 djm 1651: free(sensitive_data.keys);
1.134 markus 1652: }
1653: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1654: free(options.identity_files[i]);
1655: options.identity_files[i] = NULL;
1.134 markus 1656: if (options.identity_keys[i]) {
1.483 markus 1657: sshkey_free(options.identity_keys[i]);
1.134 markus 1658: options.identity_keys[i] = NULL;
1659: }
1.112 markus 1660: }
1.426 djm 1661: for (i = 0; i < options.num_certificate_files; i++) {
1662: free(options.certificate_files[i]);
1663: options.certificate_files[i] = NULL;
1664: }
1.31 markus 1665:
1.447 markus 1666: skip_connect:
1.544 djm 1667: exit_status = ssh_session2(ssh, cinfo);
1668: ssh_conn_info_free(cinfo);
1.499 djm 1669: ssh_packet_close(ssh);
1.186 djm 1670:
1.312 djm 1671: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1672: unlink(options.control_path);
1673:
1.353 djm 1674: /* Kill ProxyCommand if it is running. */
1675: ssh_kill_proxy_command();
1.186 djm 1676:
1.45 markus 1677: return exit_status;
1678: }
1679:
1.344 djm 1680: static void
1681: control_persist_detach(void)
1682: {
1683: pid_t pid;
1684:
1.540 djm 1685: debug_f("backgrounding master process");
1.344 djm 1686:
1.473 djm 1687: /*
1688: * master (current process) into the background, and make the
1689: * foreground process a client of the backgrounded master.
1690: */
1.344 djm 1691: switch ((pid = fork())) {
1692: case -1:
1.540 djm 1693: fatal_f("fork: %s", strerror(errno));
1.344 djm 1694: case 0:
1695: /* Child: master process continues mainloop */
1.473 djm 1696: break;
1697: default:
1.531 djm 1698: /* Parent: set up mux client to connect to backgrounded master */
1.540 djm 1699: debug2_f("background process is %ld", (long)pid);
1.344 djm 1700: stdin_null_flag = ostdin_null_flag;
1.359 djm 1701: options.request_tty = orequest_tty;
1.344 djm 1702: tty_flag = otty_flag;
1.473 djm 1703: close(muxserver_sock);
1704: muxserver_sock = -1;
1.351 markus 1705: options.control_master = SSHCTL_MASTER_NO;
1.473 djm 1706: muxclient(options.control_path);
1.344 djm 1707: /* muxclient() doesn't return on success. */
1.473 djm 1708: fatal("Failed to connect to new control master");
1709: }
1.537 djm 1710: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1711: error_f("stdfd_devnull failed");
1.381 djm 1712: daemon(1, 1);
1.362 djm 1713: setproctitle("%s [mux]", options.control_path);
1.344 djm 1714: }
1715:
1716: /* Do fork() after authentication. Used by "ssh -f" */
1717: static void
1718: fork_postauth(void)
1719: {
1720: if (need_controlpersist_detach)
1721: control_persist_detach();
1722: debug("forking to background");
1723: fork_after_authentication_flag = 0;
1.505 deraadt 1724: if (daemon(1, 1) == -1)
1.344 djm 1725: fatal("daemon() failed: %.200s", strerror(errno));
1.537 djm 1726: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 djm 1727: error_f("stdfd_devnull failed");
1.344 djm 1728: }
1729:
1.523 djm 1730: static void
1731: forwarding_success(void)
1732: {
1.524 djm 1733: if (forward_confirms_pending == -1)
1734: return;
1735: if (--forward_confirms_pending == 0) {
1.540 djm 1736: debug_f("all expected forwarding replies received");
1.523 djm 1737: if (fork_after_authentication_flag)
1738: fork_postauth();
1.524 djm 1739: } else {
1.540 djm 1740: debug2_f("%d expected forwarding replies remaining",
1741: forward_confirms_pending);
1.523 djm 1742: }
1743: }
1744:
1.315 djm 1745: /* Callback for remote forward global requests */
1746: static void
1.463 djm 1747: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1748: {
1.406 millert 1749: struct Forward *rfwd = (struct Forward *)ctxt;
1.499 djm 1750: u_int port;
1751: int r;
1.315 djm 1752:
1.324 djm 1753: /* XXX verbose() on failure? */
1.404 markus 1754: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1755: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1756: rfwd->listen_path ? rfwd->listen_path :
1757: rfwd->listen_host ? rfwd->listen_host : "",
1758: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1759: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1760: rfwd->connect_host, rfwd->connect_port);
1761: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1762: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1.499 djm 1763: if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1.540 djm 1764: fatal_fr(r, "parse packet");
1.499 djm 1765: if (port > 65535) {
1766: error("Invalid allocated port %u for remote "
1767: "forward to %s:%d", port,
1768: rfwd->connect_host, rfwd->connect_port);
1769: /* Ensure failure processing runs below */
1770: type = SSH2_MSG_REQUEST_FAILURE;
1771: channel_update_permission(ssh,
1772: rfwd->handle, -1);
1773: } else {
1774: rfwd->allocated_port = (int)port;
1775: logit("Allocated port %u for remote "
1776: "forward to %s:%d",
1777: rfwd->allocated_port, rfwd->connect_host,
1778: rfwd->connect_port);
1779: channel_update_permission(ssh,
1780: rfwd->handle, rfwd->allocated_port);
1781: }
1.366 markus 1782: } else {
1.480 djm 1783: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1784: }
1.324 djm 1785: }
1.468 djm 1786:
1.315 djm 1787: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1788: if (options.exit_on_forward_failure) {
1789: if (rfwd->listen_path != NULL)
1790: fatal("Error: remote port forwarding failed "
1791: "for listen path %s", rfwd->listen_path);
1792: else
1793: fatal("Error: remote port forwarding failed "
1794: "for listen port %d", rfwd->listen_port);
1795: } else {
1796: if (rfwd->listen_path != NULL)
1797: logit("Warning: remote port forwarding failed "
1798: "for listen path %s", rfwd->listen_path);
1799: else
1800: logit("Warning: remote port forwarding failed "
1801: "for listen port %d", rfwd->listen_port);
1802: }
1.315 djm 1803: }
1.523 djm 1804: forwarding_success();
1.315 djm 1805: }
1806:
1.126 itojun 1807: static void
1.463 djm 1808: client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
1.331 dtucker 1809: {
1810: debug("stdio forwarding: done");
1811: cleanup_exit(0);
1812: }
1813:
1.368 djm 1814: static void
1.463 djm 1815: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1816: {
1817: if (!success)
1818: fatal("stdio forwarding failed");
1819: }
1820:
1821: static void
1.523 djm 1822: ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
1823: {
1824: if (!success) {
1825: error("Tunnel forwarding failed");
1826: if (options.exit_on_forward_failure)
1827: cleanup_exit(255);
1828: }
1829:
1.540 djm 1830: debug_f("tunnel forward established, id=%d", id);
1.523 djm 1831: forwarding_success();
1832: }
1833:
1834: static void
1.463 djm 1835: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1836: {
1837: Channel *c;
1.332 djm 1838: int in, out;
1.331 dtucker 1839:
1.441 dtucker 1840: if (options.stdio_forward_host == NULL)
1.368 djm 1841: return;
1842:
1.540 djm 1843: debug3_f("%s:%d", options.stdio_forward_host,
1.441 dtucker 1844: options.stdio_forward_port);
1.332 djm 1845:
1.505 deraadt 1846: if ((in = dup(STDIN_FILENO)) == -1 ||
1847: (out = dup(STDOUT_FILENO)) == -1)
1.332 djm 1848: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.463 djm 1849: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.441 dtucker 1850: options.stdio_forward_port, in, out)) == NULL)
1.540 djm 1851: fatal_f("channel_connect_stdio_fwd failed");
1.463 djm 1852: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1853: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1854: }
1855:
1856: static void
1.551 ! markus 1857: ssh_init_forward_permissions(struct ssh *ssh, const char *what, char **opens,
! 1858: u_int num_opens)
! 1859: {
! 1860: u_int i;
! 1861: int port;
! 1862: char *addr, *arg, *oarg, ch;
! 1863: int where = FORWARD_LOCAL;
! 1864:
! 1865: channel_clear_permission(ssh, FORWARD_ADM, where);
! 1866: if (num_opens == 0)
! 1867: return; /* permit any */
! 1868:
! 1869: /* handle keywords: "any" / "none" */
! 1870: if (num_opens == 1 && strcmp(opens[0], "any") == 0)
! 1871: return;
! 1872: if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
! 1873: channel_disable_admin(ssh, where);
! 1874: return;
! 1875: }
! 1876: /* Otherwise treat it as a list of permitted host:port */
! 1877: for (i = 0; i < num_opens; i++) {
! 1878: oarg = arg = xstrdup(opens[i]);
! 1879: ch = '\0';
! 1880: addr = hpdelim2(&arg, &ch);
! 1881: if (addr == NULL || ch == '/')
! 1882: fatal_f("missing host in %s", what);
! 1883: addr = cleanhostname(addr);
! 1884: if (arg == NULL || ((port = permitopen_port(arg)) < 0))
! 1885: fatal_f("bad port number in %s", what);
! 1886: /* Send it to channels layer */
! 1887: channel_add_permission(ssh, FORWARD_ADM,
! 1888: where, addr, port);
! 1889: free(oarg);
! 1890: }
! 1891: }
! 1892:
! 1893: static void
1.466 djm 1894: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1895: {
1.86 markus 1896: int success = 0;
1.70 markus 1897: int i;
1.551 ! markus 1898:
! 1899: ssh_init_forward_permissions(ssh, "permitremoteopen",
! 1900: options.permitted_remote_opens,
! 1901: options.num_permitted_remote_opens);
1.331 dtucker 1902:
1.524 djm 1903: if (options.exit_on_forward_failure)
1904: forward_confirms_pending = 0; /* track pending requests */
1.70 markus 1905: /* Initiate local TCP/IP port forwardings. */
1906: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1907: debug("Local connections to %.200s:%d forwarded to remote "
1908: "address %.200s:%d",
1.406 millert 1909: (options.local_forwards[i].listen_path != NULL) ?
1910: options.local_forwards[i].listen_path :
1.234 deraadt 1911: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1912: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1913: options.local_forwards[i].listen_host,
1914: options.local_forwards[i].listen_port,
1.406 millert 1915: (options.local_forwards[i].connect_path != NULL) ?
1916: options.local_forwards[i].connect_path :
1.232 djm 1917: options.local_forwards[i].connect_host,
1918: options.local_forwards[i].connect_port);
1.463 djm 1919: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1920: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1921: }
1.283 markus 1922: if (i > 0 && success != i && options.exit_on_forward_failure)
1923: fatal("Could not request local forwarding.");
1.86 markus 1924: if (i > 0 && success == 0)
1925: error("Could not request local forwarding.");
1.70 markus 1926:
1927: /* Initiate remote TCP/IP port forwardings. */
1928: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1929: debug("Remote connections from %.200s:%d forwarded to "
1930: "local address %.200s:%d",
1.406 millert 1931: (options.remote_forwards[i].listen_path != NULL) ?
1932: options.remote_forwards[i].listen_path :
1.248 djm 1933: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1934: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1935: options.remote_forwards[i].listen_port,
1.406 millert 1936: (options.remote_forwards[i].connect_path != NULL) ?
1937: options.remote_forwards[i].connect_path :
1.232 djm 1938: options.remote_forwards[i].connect_host,
1939: options.remote_forwards[i].connect_port);
1.523 djm 1940: if ((options.remote_forwards[i].handle =
1.463 djm 1941: channel_request_remote_forwarding(ssh,
1.523 djm 1942: &options.remote_forwards[i])) >= 0) {
1.463 djm 1943: client_register_global_confirm(
1944: ssh_confirm_remote_forward,
1.366 markus 1945: &options.remote_forwards[i]);
1.523 djm 1946: forward_confirms_pending++;
1947: } else if (options.exit_on_forward_failure)
1948: fatal("Could not request remote forwarding.");
1949: else
1950: logit("Warning: Could not request remote forwarding.");
1.70 markus 1951: }
1.301 djm 1952:
1953: /* Initiate tunnel forwarding. */
1954: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1955: if ((*ifname = client_request_tun_fwd(ssh,
1956: options.tun_open, options.tun_local,
1.523 djm 1957: options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
1958: forward_confirms_pending++;
1959: else if (options.exit_on_forward_failure)
1960: fatal("Could not request tunnel forwarding.");
1961: else
1962: error("Could not request tunnel forwarding.");
1.524 djm 1963: }
1964: if (forward_confirms_pending > 0) {
1.540 djm 1965: debug_f("expecting replies for %d forwards",
1.524 djm 1966: forward_confirms_pending);
1.468 djm 1967: }
1.70 markus 1968: }
1969:
1.126 itojun 1970: static void
1.70 markus 1971: check_agent_present(void)
1972: {
1.412 djm 1973: int r;
1974:
1.70 markus 1975: if (options.forward_agent) {
1.254 djm 1976: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1977: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1978: options.forward_agent = 0;
1.412 djm 1979: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.540 djm 1980: debug_r(r, "ssh_get_authentication_socket");
1.412 djm 1981: }
1.70 markus 1982: }
1983: }
1984:
1.214 djm 1985: static void
1.463 djm 1986: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 1987: {
1.215 djm 1988: extern char **environ;
1.243 djm 1989: const char *display;
1.499 djm 1990: int r, interactive = tty_flag;
1.433 djm 1991: char *proto = NULL, *data = NULL;
1.337 djm 1992:
1993: if (!success)
1994: return; /* No need for error message, channels code sens one */
1.215 djm 1995:
1.248 djm 1996: display = getenv("DISPLAY");
1.417 djm 1997: if (display == NULL && options.forward_x11)
1998: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 1999: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 2000: options.xauth_location, options.forward_x11_trusted,
2001: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 2002: /* Request forwarding with authentication spoofing. */
1.316 djm 2003: debug("Requesting X11 forwarding with authentication "
2004: "spoofing.");
1.463 djm 2005: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 2006: data, 1);
1.463 djm 2007: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 2008: /* XXX exit_on_forward_failure */
1.80 markus 2009: interactive = 1;
1.50 markus 2010: }
2011:
1.70 markus 2012: check_agent_present();
2013: if (options.forward_agent) {
2014: debug("Requesting authentication agent forwarding.");
1.463 djm 2015: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 2016: if ((r = sshpkt_send(ssh)) != 0)
1.540 djm 2017: fatal_fr(r, "send packet");
1.212 djm 2018: }
1.369 dtucker 2019:
2020: /* Tell the packet module whether this is an interactive session. */
1.499 djm 2021: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 2022: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 2023:
1.463 djm 2024: client_session2_setup(ssh, id, tty_flag, subsystem_flag, getenv("TERM"),
1.482 markus 2025: NULL, fileno(stdin), command, environ);
1.45 markus 2026: }
2027:
1.143 markus 2028: /* open new channel for a session */
1.126 itojun 2029: static int
1.463 djm 2030: ssh_session2_open(struct ssh *ssh)
1.45 markus 2031: {
1.118 markus 2032: Channel *c;
2033: int window, packetmax, in, out, err;
1.60 markus 2034:
1.62 markus 2035: if (stdin_null_flag) {
1.93 itojun 2036: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 2037: } else {
2038: in = dup(STDIN_FILENO);
2039: }
1.60 markus 2040: out = dup(STDOUT_FILENO);
2041: err = dup(STDERR_FILENO);
1.45 markus 2042:
1.505 deraadt 2043: if (in == -1 || out == -1 || err == -1)
1.62 markus 2044: fatal("dup() in/out/err failed");
1.45 markus 2045:
1.69 markus 2046: /* enable nonblocking unless tty */
2047: if (!isatty(in))
2048: set_nonblock(in);
2049: if (!isatty(out))
2050: set_nonblock(out);
2051: if (!isatty(err))
2052: set_nonblock(err);
2053:
1.65 markus 2054: window = CHAN_SES_WINDOW_DEFAULT;
2055: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 2056: if (tty_flag) {
2057: window >>= 1;
2058: packetmax >>= 1;
1.45 markus 2059: }
1.463 djm 2060: c = channel_new(ssh,
1.45 markus 2061: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 2062: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 2063: "client-session", /*nonblock*/0);
1.45 markus 2064:
1.540 djm 2065: debug3_f("channel_new: %d", c->self);
1.106 markus 2066:
1.463 djm 2067: channel_send_open(ssh, c->self);
1.143 markus 2068: if (!no_shell_flag)
1.463 djm 2069: channel_register_open_confirm(ssh, c->self,
1.310 djm 2070: ssh_session2_setup, NULL);
1.106 markus 2071:
1.118 markus 2072: return c->self;
1.106 markus 2073: }
2074:
1.126 itojun 2075: static int
1.544 djm 2076: ssh_session2(struct ssh *ssh, const struct ssh_conn_info *cinfo)
1.106 markus 2077: {
1.537 djm 2078: int r, id = -1;
1.466 djm 2079: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 2080:
2081: /* XXX should be pre-session */
1.368 djm 2082: if (!options.control_persist)
1.463 djm 2083: ssh_init_stdio_forwarding(ssh);
1.466 djm 2084:
2085: ssh_init_forwarding(ssh, &tun_fwd_ifname);
2086:
2087: if (options.local_command != NULL) {
2088: debug3("expanding LocalCommand: %s", options.local_command);
2089: cp = options.local_command;
2090: options.local_command = percent_expand(cp,
1.546 djm 2091: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
1.466 djm 2092: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2093: (char *)NULL);
2094: debug3("expanded LocalCommand: %s", options.local_command);
2095: free(cp);
2096: }
1.106 markus 2097:
1.344 djm 2098: /* Start listening for multiplex clients */
1.499 djm 2099: if (!ssh_packet_get_mux(ssh))
1.463 djm 2100: muxserver_listen(ssh);
1.344 djm 2101:
1.473 djm 2102: /*
1.368 djm 2103: * If we are in control persist mode and have a working mux listen
2104: * socket, then prepare to background ourselves and have a foreground
1.531 djm 2105: * client attach as a control client.
1.368 djm 2106: * NB. we must save copies of the flags that we override for
1.531 djm 2107: * the backgrounding, since we defer attachment of the client until
1.344 djm 2108: * after the connection is fully established (in particular,
2109: * async rfwd replies have been received for ExitOnForwardFailure).
2110: */
1.473 djm 2111: if (options.control_persist && muxserver_sock != -1) {
1.344 djm 2112: ostdin_null_flag = stdin_null_flag;
2113: ono_shell_flag = no_shell_flag;
1.359 djm 2114: orequest_tty = options.request_tty;
1.344 djm 2115: otty_flag = tty_flag;
1.473 djm 2116: stdin_null_flag = 1;
2117: no_shell_flag = 1;
2118: tty_flag = 0;
1.344 djm 2119: if (!fork_after_authentication_flag)
2120: need_controlpersist_detach = 1;
2121: fork_after_authentication_flag = 1;
1.473 djm 2122: }
1.368 djm 2123: /*
2124: * ControlPersist mux listen socket setup failed, attempt the
2125: * stdio forward setup that we skipped earlier.
2126: */
2127: if (options.control_persist && muxserver_sock == -1)
1.463 djm 2128: ssh_init_stdio_forwarding(ssh);
1.344 djm 2129:
1.471 djm 2130: if (!no_shell_flag)
1.463 djm 2131: id = ssh_session2_open(ssh);
1.379 djm 2132: else {
1.499 djm 2133: ssh_packet_set_interactive(ssh,
1.379 djm 2134: options.control_master == SSHCTL_MASTER_NO,
2135: options.ip_qos_interactive, options.ip_qos_bulk);
2136: }
1.314 djm 2137:
2138: /* If we don't expect to open a new session, then disallow it */
1.319 markus 2139: if (options.control_master == SSHCTL_MASTER_NO &&
1.549 djm 2140: (ssh->compat & SSH_NEW_OPENSSH)) {
1.314 djm 2141: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 2142: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2143: (r = sshpkt_put_cstring(ssh,
2144: "no-more-sessions@openssh.com")) != 0 ||
2145: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2146: (r = sshpkt_send(ssh)) != 0)
1.540 djm 2147: fatal_fr(r, "send packet");
1.314 djm 2148: }
1.255 reyk 2149:
2150: /* Execute a local command */
2151: if (options.local_command != NULL &&
2152: options.permit_local_command)
2153: ssh_local_cmd(options.local_command);
1.467 djm 2154:
2155: /*
2156: * stdout is now owned by the session channel; clobber it here
2157: * so future channel closes are propagated to the local fd.
2158: * NB. this can only happen after LocalCommand has completed,
2159: * as it may want to write to stdout.
2160: */
1.537 djm 2161: if (!need_controlpersist_detach && stdfd_devnull(0, 1, 0) == -1)
1.540 djm 2162: error_f("stdfd_devnull failed");
1.301 djm 2163:
1.342 djm 2164: /*
2165: * If requested and we are not interested in replies to remote
2166: * forwarding requests, then let ssh continue in the background.
2167: */
1.344 djm 2168: if (fork_after_authentication_flag) {
2169: if (options.exit_on_forward_failure &&
2170: options.num_remote_forwards > 0) {
2171: debug("deferring postauth fork until remote forward "
2172: "confirmation received");
2173: } else
2174: fork_postauth();
1.318 djm 2175: }
1.31 markus 2176:
1.463 djm 2177: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2178: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2179: }
2180:
1.426 djm 2181: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2182: static void
1.544 djm 2183: load_public_identity_files(const struct ssh_conn_info *cinfo)
1.104 markus 2184: {
1.466 djm 2185: char *filename, *cp;
1.460 markus 2186: struct sshkey *public;
1.426 djm 2187: int i;
2188: u_int n_ids, n_certs;
1.335 djm 2189: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2190: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2191: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2192: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2193: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2194: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2195: #ifdef ENABLE_PKCS11
1.514 djm 2196: struct sshkey **keys = NULL;
2197: char **comments = NULL;
1.333 markus 2198: int nkeys;
1.335 djm 2199: #endif /* PKCS11 */
1.104 markus 2200:
1.426 djm 2201: n_ids = n_certs = 0;
1.398 tedu 2202: memset(identity_files, 0, sizeof(identity_files));
2203: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2204: memset(identity_file_userprovided, 0,
2205: sizeof(identity_file_userprovided));
1.426 djm 2206: memset(certificate_files, 0, sizeof(certificate_files));
2207: memset(certificates, 0, sizeof(certificates));
1.484 djm 2208: memset(certificate_file_userprovided, 0,
2209: sizeof(certificate_file_userprovided));
1.335 djm 2210:
2211: #ifdef ENABLE_PKCS11
1.333 markus 2212: if (options.pkcs11_provider != NULL &&
1.167 markus 2213: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2214: (pkcs11_init(!options.batch_mode) == 0) &&
2215: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1.514 djm 2216: &keys, &comments)) > 0) {
1.333 markus 2217: for (i = 0; i < nkeys; i++) {
1.335 djm 2218: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2219: sshkey_free(keys[i]);
1.514 djm 2220: free(comments[i]);
1.335 djm 2221: continue;
2222: }
2223: identity_keys[n_ids] = keys[i];
1.514 djm 2224: identity_files[n_ids] = comments[i]; /* transferred */
1.335 djm 2225: n_ids++;
1.167 markus 2226: }
1.378 djm 2227: free(keys);
1.514 djm 2228: free(comments);
1.127 markus 2229: }
1.333 markus 2230: #endif /* ENABLE_PKCS11 */
1.335 djm 2231: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2232: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2233: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2234: free(options.identity_files[i]);
1.426 djm 2235: options.identity_files[i] = NULL;
1.335 djm 2236: continue;
2237: }
1.490 dtucker 2238: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.544 djm 2239: filename = default_client_percent_dollar_expand(cp, cinfo);
1.378 djm 2240: free(cp);
1.483 markus 2241: check_load(sshkey_load_public(filename, &public, NULL),
2242: filename, "pubkey");
1.131 millert 2243: debug("identity file %s type %d", filename,
2244: public ? public->type : -1);
1.378 djm 2245: free(options.identity_files[i]);
1.335 djm 2246: identity_files[n_ids] = filename;
2247: identity_keys[n_ids] = public;
1.484 djm 2248: identity_file_userprovided[n_ids] =
2249: options.identity_file_userprovided[i];
1.335 djm 2250: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2251: continue;
2252:
1.426 djm 2253: /*
2254: * If no certificates have been explicitly listed then try
2255: * to add the default certificate variant too.
2256: */
2257: if (options.num_certificate_files != 0)
2258: continue;
1.335 djm 2259: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2260: check_load(sshkey_load_public(cp, &public, NULL),
2261: filename, "pubkey");
1.335 djm 2262: debug("identity file %s type %d", cp,
2263: public ? public->type : -1);
2264: if (public == NULL) {
1.378 djm 2265: free(cp);
1.335 djm 2266: continue;
2267: }
1.483 markus 2268: if (!sshkey_is_cert(public)) {
1.540 djm 2269: debug_f("key %s type %s is not a certificate",
2270: cp, sshkey_type(public));
1.483 markus 2271: sshkey_free(public);
1.378 djm 2272: free(cp);
1.335 djm 2273: continue;
2274: }
1.448 djm 2275: /* NB. leave filename pointing to private key */
2276: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2277: identity_keys[n_ids] = public;
1.484 djm 2278: identity_file_userprovided[n_ids] =
2279: options.identity_file_userprovided[i];
1.335 djm 2280: n_ids++;
2281: }
1.426 djm 2282:
2283: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
1.540 djm 2284: fatal_f("too many certificates");
1.426 djm 2285: for (i = 0; i < options.num_certificate_files; i++) {
2286: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2287: getuid());
1.544 djm 2288: filename = default_client_percent_dollar_expand(cp, cinfo);
1.426 djm 2289: free(cp);
2290:
1.483 markus 2291: check_load(sshkey_load_public(filename, &public, NULL),
2292: filename, "certificate");
1.426 djm 2293: debug("certificate file %s type %d", filename,
2294: public ? public->type : -1);
2295: free(options.certificate_files[i]);
2296: options.certificate_files[i] = NULL;
2297: if (public == NULL) {
2298: free(filename);
2299: continue;
2300: }
1.483 markus 2301: if (!sshkey_is_cert(public)) {
1.540 djm 2302: debug_f("key %s type %s is not a certificate",
2303: filename, sshkey_type(public));
1.483 markus 2304: sshkey_free(public);
1.426 djm 2305: free(filename);
2306: continue;
2307: }
2308: certificate_files[n_certs] = filename;
2309: certificates[n_certs] = public;
1.484 djm 2310: certificate_file_userprovided[n_certs] =
2311: options.certificate_file_userprovided[i];
1.426 djm 2312: ++n_certs;
2313: }
2314:
1.335 djm 2315: options.num_identity_files = n_ids;
2316: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2317: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2318: memcpy(options.identity_file_userprovided,
2319: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2320:
2321: options.num_certificate_files = n_certs;
2322: memcpy(options.certificate_files,
2323: certificate_files, sizeof(certificate_files));
2324: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2325: memcpy(options.certificate_file_userprovided,
2326: certificate_file_userprovided,
2327: sizeof(certificate_file_userprovided));
1.214 djm 2328: }
1.352 djm 2329:
2330: static void
2331: main_sigchld_handler(int sig)
2332: {
2333: int save_errno = errno;
2334: pid_t pid;
2335: int status;
2336:
2337: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2338: (pid == -1 && errno == EINTR))
1.352 djm 2339: ;
2340: errno = save_errno;
2341: }
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