Annotation of src/usr.bin/ssh/ssh.c, Revision 1.536
1.536 ! djm 1: /* $OpenBSD: ssh.c,v 1.535 2020/09/20 23:31:46 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:
1.466 djm 160: /* Various strings used to to percent_expand() arguments */
161: static char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
162: static char uidstr[32], *host_arg, *conn_hash_hex;
1.533 dtucker 163: static const char *keyalias;
1.466 djm 164:
1.22 provos 165: /* socket address the host resolves to */
1.37 markus 166: struct sockaddr_storage hostaddr;
1.1 deraadt 167:
1.112 markus 168: /* Private host keys. */
1.173 markus 169: Sensitive sensitive_data;
1.1 deraadt 170:
1.45 markus 171: /* command to be executed */
1.482 markus 172: struct sshbuf *command;
1.45 markus 173:
1.85 djm 174: /* Should we execute a command or invoke a subsystem? */
175: int subsystem_flag = 0;
176:
1.170 markus 177: /* # of replies received for global requests */
1.523 djm 178: static int forward_confirms_pending = -1;
1.170 markus 179:
1.313 djm 180: /* mux.c */
181: extern int muxserver_sock;
182: extern u_int muxclient_command;
183:
1.1 deraadt 184: /* Prints a help message to the user. This function never returns. */
185:
1.126 itojun 186: static void
1.93 itojun 187: usage(void)
1.1 deraadt 188: {
1.208 markus 189: fprintf(stderr,
1.474 djm 190: "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n"
191: " [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n"
192: " [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n"
193: " [-i identity_file] [-J [user@]host[:port]] [-L address]\n"
194: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
195: " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
196: " [-w local_tun[:remote_tun]] destination [command]\n"
1.208 markus 197: );
1.257 dtucker 198: exit(255);
1.1 deraadt 199: }
200:
1.466 djm 201: static int ssh_session2(struct ssh *, struct passwd *);
202: static void load_public_identity_files(struct passwd *);
1.352 djm 203: static void main_sigchld_handler(int);
1.312 djm 204:
1.361 djm 205: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
206: static void
207: tilde_expand_paths(char **paths, u_int num_paths)
208: {
209: u_int i;
210: char *cp;
211:
212: for (i = 0; i < num_paths; i++) {
1.490 dtucker 213: cp = tilde_expand_filename(paths[i], getuid());
1.378 djm 214: free(paths[i]);
1.361 djm 215: paths[i] = cp;
216: }
217: }
218:
1.527 dtucker 219: #define DEFAULT_CLIENT_PERCENT_EXPAND_ARGS \
220: "C", conn_hash_hex, \
221: "L", shorthost, \
222: "i", uidstr, \
1.533 dtucker 223: "k", keyalias, \
1.527 dtucker 224: "l", thishost, \
225: "n", host_arg, \
226: "p", portstr
227:
228: /*
229: * Expands the set of percent_expand options used by the majority of keywords
230: * in the client that support percent expansion.
231: * Caller must free returned string.
232: */
233: static char *
234: default_client_percent_expand(const char *str, const char *homedir,
235: const char *remhost, const char *remuser, const char *locuser)
236: {
237: return percent_expand(str,
238: /* values from statics above */
239: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS,
240: /* values from arguments */
241: "d", homedir,
242: "h", remhost,
243: "r", remuser,
244: "u", locuser,
245: (char *)NULL);
246: }
247:
1.400 djm 248: /*
1.528 dtucker 249: * Expands the set of percent_expand options used by the majority of keywords
250: * AND perform environment variable substitution.
251: * Caller must free returned string.
252: */
253: static char *
254: default_client_percent_dollar_expand(const char *str, const char *homedir,
255: const char *remhost, const char *remuser, const char *locuser)
256: {
257: char *ret;
258:
259: ret = percent_dollar_expand(str,
260: /* values from statics above */
261: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS,
262: /* values from arguments */
263: "d", homedir,
264: "h", remhost,
265: "r", remuser,
266: "u", locuser,
267: (char *)NULL);
268: if (ret == NULL)
269: fatal("invalid environment variable expansion");
270: return ret;
271: }
272:
273: /*
1.400 djm 274: * Attempt to resolve a host name / port to a set of addresses and
275: * optionally return any CNAMEs encountered along the way.
276: * Returns NULL on failure.
277: * NB. this function must operate with a options having undefined members.
278: */
1.385 djm 279: static struct addrinfo *
1.400 djm 280: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 281: {
282: char strport[NI_MAXSERV];
283: struct addrinfo hints, *res;
1.501 dtucker 284: int gaierr;
285: LogLevel loglevel = SYSLOG_LEVEL_DEBUG1;
1.385 djm 286:
1.400 djm 287: if (port <= 0)
288: port = default_ssh_port();
1.521 markus 289: if (cname != NULL)
290: *cname = '\0';
1.400 djm 291:
1.427 djm 292: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 293: memset(&hints, 0, sizeof(hints));
1.400 djm 294: hints.ai_family = options.address_family == -1 ?
295: AF_UNSPEC : options.address_family;
1.385 djm 296: hints.ai_socktype = SOCK_STREAM;
297: if (cname != NULL)
298: hints.ai_flags = AI_CANONNAME;
299: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
300: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
301: loglevel = SYSLOG_LEVEL_ERROR;
302: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
303: __progname, name, ssh_gai_strerror(gaierr));
304: return NULL;
305: }
306: if (cname != NULL && res->ai_canonname != NULL) {
307: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
308: error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
309: __func__, name, res->ai_canonname, (u_long)clen);
310: if (clen > 0)
311: *cname = '\0';
312: }
313: }
314: return res;
315: }
316:
1.470 djm 317: /* Returns non-zero if name can only be an address and not a hostname */
318: static int
319: is_addr_fast(const char *name)
320: {
321: return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
322: strspn(name, "0123456789.") == strlen(name));
323: }
324:
325: /* Returns non-zero if name represents a valid, single address */
326: static int
327: is_addr(const char *name)
328: {
329: char strport[NI_MAXSERV];
330: struct addrinfo hints, *res;
331:
332: if (is_addr_fast(name))
333: return 1;
334:
335: snprintf(strport, sizeof strport, "%u", default_ssh_port());
336: memset(&hints, 0, sizeof(hints));
337: hints.ai_family = options.address_family == -1 ?
338: AF_UNSPEC : options.address_family;
339: hints.ai_socktype = SOCK_STREAM;
340: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
341: if (getaddrinfo(name, strport, &hints, &res) != 0)
342: return 0;
343: if (res == NULL || res->ai_next != NULL) {
344: freeaddrinfo(res);
345: return 0;
346: }
347: freeaddrinfo(res);
348: return 1;
349: }
350:
1.385 djm 351: /*
1.413 djm 352: * Attempt to resolve a numeric host address / port to a single address.
353: * Returns a canonical address string.
354: * Returns NULL on failure.
355: * NB. this function must operate with a options having undefined members.
356: */
357: static struct addrinfo *
358: resolve_addr(const char *name, int port, char *caddr, size_t clen)
359: {
360: char addr[NI_MAXHOST], strport[NI_MAXSERV];
361: struct addrinfo hints, *res;
362: int gaierr;
363:
364: if (port <= 0)
365: port = default_ssh_port();
366: snprintf(strport, sizeof strport, "%u", port);
367: memset(&hints, 0, sizeof(hints));
368: hints.ai_family = options.address_family == -1 ?
369: AF_UNSPEC : options.address_family;
370: hints.ai_socktype = SOCK_STREAM;
371: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
372: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
373: debug2("%s: could not resolve name %.100s as address: %s",
374: __func__, name, ssh_gai_strerror(gaierr));
375: return NULL;
376: }
377: if (res == NULL) {
378: debug("%s: getaddrinfo %.100s returned no addresses",
379: __func__, name);
380: return NULL;
381: }
382: if (res->ai_next != NULL) {
383: debug("%s: getaddrinfo %.100s returned multiple addresses",
384: __func__, name);
385: goto fail;
386: }
387: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
388: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
389: debug("%s: Could not format address for name %.100s: %s",
390: __func__, name, ssh_gai_strerror(gaierr));
391: goto fail;
392: }
393: if (strlcpy(caddr, addr, clen) >= clen) {
394: error("%s: host \"%s\" addr \"%s\" too long (max %lu)",
395: __func__, name, addr, (u_long)clen);
396: if (clen > 0)
397: *caddr = '\0';
398: fail:
399: freeaddrinfo(res);
400: return NULL;
401: }
402: return res;
403: }
404:
405: /*
1.385 djm 406: * Check whether the cname is a permitted replacement for the hostname
407: * and perform the replacement if it is.
1.400 djm 408: * NB. this function must operate with a options having undefined members.
1.385 djm 409: */
410: static int
1.443 djm 411: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 412: {
413: int i;
414: struct allowed_cname *rule;
415:
416: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
417: strcmp(*namep, cname) == 0)
418: return 0;
1.386 djm 419: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 420: return 0;
421: /*
1.386 djm 422: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 423: * a proxy or jump host unless the user specifically requests so.
1.385 djm 424: */
1.443 djm 425: if (!direct &&
1.386 djm 426: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 427: return 0;
428: debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
429: for (i = 0; i < options.num_permitted_cnames; i++) {
430: rule = options.permitted_cnames + i;
1.418 djm 431: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
432: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 433: continue;
1.386 djm 434: verbose("Canonicalized DNS aliased hostname "
1.385 djm 435: "\"%s\" => \"%s\"", *namep, cname);
436: free(*namep);
437: *namep = xstrdup(cname);
438: return 1;
439: }
440: return 0;
441: }
442:
443: /*
444: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 445: * canonicalization rules. Returns the address list for the host or NULL
446: * if no name was found after canonicalization.
1.400 djm 447: * NB. this function must operate with a options having undefined members.
1.385 djm 448: */
449: static struct addrinfo *
1.400 djm 450: resolve_canonicalize(char **hostp, int port)
1.385 djm 451: {
1.443 djm 452: int i, direct, ndots;
1.413 djm 453: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 454: struct addrinfo *addrs;
455:
456: /*
1.470 djm 457: * Attempt to canonicalise addresses, regardless of
458: * whether hostname canonicalisation was requested
1.385 djm 459: */
1.413 djm 460: if ((addrs = resolve_addr(*hostp, port,
461: newname, sizeof(newname))) != NULL) {
462: debug2("%s: hostname %.100s is address", __func__, *hostp);
463: if (strcasecmp(*hostp, newname) != 0) {
464: debug2("%s: canonicalised address \"%s\" => \"%s\"",
465: __func__, *hostp, newname);
466: free(*hostp);
467: *hostp = xstrdup(newname);
468: }
469: return addrs;
470: }
471:
1.470 djm 472: /*
473: * If this looks like an address but didn't parse as one, it might
474: * be an address with an invalid interface scope. Skip further
475: * attempts at canonicalisation.
476: */
477: if (is_addr_fast(*hostp)) {
478: debug("%s: hostname %.100s is an unrecognised address",
479: __func__, *hostp);
480: return NULL;
481: }
482:
483: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
484: return NULL;
485:
486: /*
487: * Don't attempt to canonicalize names that will be interpreted by
488: * a proxy unless the user specifically requests so.
489: */
490: direct = option_clear_or_none(options.proxy_command) &&
491: options.jump_host == NULL;
492: if (!direct &&
493: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
494: return NULL;
495:
1.428 djm 496: /* If domain name is anchored, then resolve it now */
497: if ((*hostp)[strlen(*hostp) - 1] == '.') {
498: debug3("%s: name is fully qualified", __func__);
499: fullhost = xstrdup(*hostp);
500: if ((addrs = resolve_host(fullhost, port, 0,
501: newname, sizeof(newname))) != NULL)
502: goto found;
503: free(fullhost);
504: goto notfound;
505: }
506:
1.387 djm 507: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 508: ndots = 0;
509: for (cp = *hostp; *cp != '\0'; cp++) {
510: if (*cp == '.')
511: ndots++;
512: }
1.386 djm 513: if (ndots > options.canonicalize_max_dots) {
514: debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
515: __func__, *hostp, options.canonicalize_max_dots);
1.385 djm 516: return NULL;
517: }
518: /* Attempt each supplied suffix */
519: for (i = 0; i < options.num_canonical_domains; i++) {
520: xasprintf(&fullhost, "%s.%s.", *hostp,
521: options.canonical_domains[i]);
1.400 djm 522: debug3("%s: attempting \"%s\" => \"%s\"", __func__,
523: *hostp, fullhost);
524: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 525: newname, sizeof(newname))) == NULL) {
1.385 djm 526: free(fullhost);
527: continue;
528: }
1.428 djm 529: found:
1.385 djm 530: /* Remove trailing '.' */
531: fullhost[strlen(fullhost) - 1] = '\0';
532: /* Follow CNAME if requested */
1.443 djm 533: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 534: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 535: *hostp, fullhost);
536: }
537: free(*hostp);
538: *hostp = fullhost;
539: return addrs;
540: }
1.428 djm 541: notfound:
1.386 djm 542: if (!options.canonicalize_fallback_local)
1.400 djm 543: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
544: debug2("%s: host %s not found in any suffix", __func__, *hostp);
1.385 djm 545: return NULL;
546: }
547:
1.32 deraadt 548: /*
1.483 markus 549: * Check the result of hostkey loading, ignoring some errors and
550: * fatal()ing for others.
551: */
552: static void
553: check_load(int r, const char *path, const char *message)
554: {
555: switch (r) {
556: case 0:
557: break;
558: case SSH_ERR_INTERNAL_ERROR:
559: case SSH_ERR_ALLOC_FAIL:
560: fatal("load %s \"%s\": %s", message, path, ssh_err(r));
561: case SSH_ERR_SYSTEM_ERROR:
562: /* Ignore missing files */
563: if (errno == ENOENT)
564: break;
565: /* FALLTHROUGH */
566: default:
567: error("load %s \"%s\": %s", message, path, ssh_err(r));
568: break;
569: }
570: }
571:
572: /*
1.400 djm 573: * Read per-user configuration file. Ignore the system wide config
574: * file if the user specifies a config file on the command line.
575: */
576: static void
1.496 djm 577: process_config_files(const char *host_name, struct passwd *pw, int final_pass,
578: int *want_final_pass)
1.400 djm 579: {
1.414 deraadt 580: char buf[PATH_MAX];
1.400 djm 581: int r;
582:
583: if (config != NULL) {
584: if (strcasecmp(config, "none") != 0 &&
1.466 djm 585: !read_config_file(config, pw, host, host_name, &options,
1.496 djm 586: SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0),
587: want_final_pass))
1.400 djm 588: fatal("Can't open user config file %.100s: "
589: "%.100s", config, strerror(errno));
590: } else {
591: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
592: _PATH_SSH_USER_CONFFILE);
593: if (r > 0 && (size_t)r < sizeof(buf))
1.466 djm 594: (void)read_config_file(buf, pw, host, host_name,
1.408 djm 595: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
1.496 djm 596: (final_pass ? SSHCONF_FINAL : 0), want_final_pass);
1.400 djm 597:
598: /* Read systemwide configuration file after user config. */
1.408 djm 599: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
1.466 djm 600: host, host_name, &options,
1.496 djm 601: final_pass ? SSHCONF_FINAL : 0, want_final_pass);
1.408 djm 602: }
603: }
604:
605: /* Rewrite the port number in an addrinfo list of addresses */
606: static void
607: set_addrinfo_port(struct addrinfo *addrs, int port)
608: {
609: struct addrinfo *addr;
610:
611: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
612: switch (addr->ai_family) {
613: case AF_INET:
614: ((struct sockaddr_in *)addr->ai_addr)->
615: sin_port = htons(port);
616: break;
617: case AF_INET6:
618: ((struct sockaddr_in6 *)addr->ai_addr)->
619: sin6_port = htons(port);
620: break;
621: }
1.400 djm 622: }
623: }
624:
625: /*
1.32 deraadt 626: * Main program for the ssh client.
627: */
1.2 provos 628: int
629: main(int ac, char **av)
1.1 deraadt 630: {
1.437 djm 631: struct ssh *ssh = NULL;
1.462 djm 632: int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
1.496 djm 633: int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
1.530 dtucker 634: char *p, *cp, *line, *argv0, *logfile;
1.466 djm 635: char cname[NI_MAXHOST];
1.31 markus 636: struct stat st;
1.98 markus 637: struct passwd *pw;
1.144 stevesk 638: extern int optind, optreset;
639: extern char *optarg;
1.406 millert 640: struct Forward fwd;
1.385 djm 641: struct addrinfo *addrs = NULL;
1.513 dtucker 642: size_t n, len;
1.532 dtucker 643: u_int j;
1.250 djm 644:
645: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
646: sanitise_stdfd();
1.31 markus 647:
1.33 markus 648: /*
1.346 djm 649: * Discard other fds that are hanging around. These can cause problem
650: * with backgrounded ssh processes started by ControlPersist.
651: */
652: closefrom(STDERR_FILENO + 1);
653:
1.487 dtucker 654: if (getuid() != geteuid())
655: fatal("ssh setuid not supported.");
656: if (getgid() != getegid())
657: fatal("ssh setgid not supported.");
1.184 stevesk 658:
1.107 markus 659: /* Get user data. */
1.490 dtucker 660: pw = getpwuid(getuid());
1.107 markus 661: if (!pw) {
1.490 dtucker 662: logit("No user exists for uid %lu", (u_long)getuid());
1.257 dtucker 663: exit(255);
1.107 markus 664: }
665: /* Take a copy of the returned structure. */
666: pw = pwcopy(pw);
1.31 markus 667:
1.33 markus 668: /*
669: * Set our umask to something reasonable, as some files are created
670: * with the default umask. This will make them world-readable but
671: * writable only by the owner, which is ok for all files for which we
672: * don't set the modes explicitly.
673: */
1.31 markus 674: umask(022);
1.445 djm 675:
676: setlocale(LC_CTYPE, "");
1.31 markus 677:
1.316 djm 678: /*
679: * Initialize option structure to indicate that no values have been
680: * set.
681: */
1.31 markus 682: initialize_options(&options);
683:
1.463 djm 684: /*
685: * Prepare main ssh transport/connection structures
686: */
687: if ((ssh = ssh_alloc_session_state()) == NULL)
688: fatal("Couldn't allocate session state");
689: channel_init_channels(ssh);
690:
1.31 markus 691: /* Parse command-line arguments. */
692: host = NULL;
1.320 djm 693: use_syslog = 0;
1.375 dtucker 694: logfile = NULL;
1.325 markus 695: argv0 = av[0];
1.31 markus 696:
1.266 djm 697: again:
1.316 djm 698: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.474 djm 699: "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 700: switch (opt) {
1.91 jakob 701: case '1':
1.454 djm 702: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 703: break;
1.47 markus 704: case '2':
1.454 djm 705: /* Ignored */
1.47 markus 706: break;
1.37 markus 707: case '4':
1.196 djm 708: options.address_family = AF_INET;
1.37 markus 709: break;
710: case '6':
1.196 djm 711: options.address_family = AF_INET6;
1.37 markus 712: break;
1.31 markus 713: case 'n':
714: stdin_null_flag = 1;
715: break;
716: case 'f':
717: fork_after_authentication_flag = 1;
718: stdin_null_flag = 1;
719: break;
720: case 'x':
721: options.forward_x11 = 0;
722: break;
723: case 'X':
724: options.forward_x11 = 1;
725: break;
1.320 djm 726: case 'y':
727: use_syslog = 1;
728: break;
1.375 dtucker 729: case 'E':
1.422 dtucker 730: logfile = optarg;
1.375 dtucker 731: break;
1.408 djm 732: case 'G':
733: config_test = 1;
734: break;
1.202 markus 735: case 'Y':
736: options.forward_x11 = 1;
737: options.forward_x11_trusted = 1;
738: break;
1.31 markus 739: case 'g':
1.406 millert 740: options.fwd_opts.gateway_ports = 1;
1.31 markus 741: break;
1.229 djm 742: case 'O':
1.441 dtucker 743: if (options.stdio_forward_host != NULL)
1.332 djm 744: fatal("Cannot specify multiplexing "
745: "command with -W");
746: else if (muxclient_command != 0)
747: fatal("Multiplexing command already specified");
1.229 djm 748: if (strcmp(optarg, "check") == 0)
1.312 djm 749: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 750: else if (strcmp(optarg, "forward") == 0)
751: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 752: else if (strcmp(optarg, "exit") == 0)
1.312 djm 753: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 754: else if (strcmp(optarg, "stop") == 0)
755: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 756: else if (strcmp(optarg, "cancel") == 0)
757: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 758: else if (strcmp(optarg, "proxy") == 0)
759: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 760: else
761: fatal("Invalid multiplex command.");
762: break;
1.183 stevesk 763: case 'P': /* deprecated */
1.376 djm 764: break;
1.394 deraadt 765: case 'Q':
1.376 djm 766: cp = NULL;
1.519 dtucker 767: if (strcmp(optarg, "cipher") == 0 ||
768: strcasecmp(optarg, "Ciphers") == 0)
1.393 djm 769: cp = cipher_alg_list('\n', 0);
1.394 deraadt 770: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 771: cp = cipher_alg_list('\n', 1);
1.519 dtucker 772: else if (strcmp(optarg, "mac") == 0 ||
773: strcasecmp(optarg, "MACs") == 0)
1.392 dtucker 774: cp = mac_alg_list('\n');
1.519 dtucker 775: else if (strcmp(optarg, "kex") == 0 ||
776: strcasecmp(optarg, "KexAlgorithms") == 0)
1.392 dtucker 777: cp = kex_alg_list('\n');
1.394 deraadt 778: else if (strcmp(optarg, "key") == 0)
1.451 djm 779: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 780: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 781: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 782: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 783: cp = sshkey_alg_list(0, 1, 0, '\n');
1.519 dtucker 784: else if (strcmp(optarg, "key-sig") == 0 ||
785: strcasecmp(optarg, "PubkeyAcceptedKeyTypes") == 0 ||
786: strcasecmp(optarg, "HostKeyAlgorithms") == 0 ||
787: strcasecmp(optarg, "HostbasedKeyTypes") == 0 ||
788: strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 0)
789: cp = sshkey_alg_list(0, 0, 1, '\n');
1.491 djm 790: else if (strcmp(optarg, "sig") == 0)
1.492 djm 791: cp = sshkey_alg_list(0, 1, 1, '\n');
1.491 djm 792: else if (strcmp(optarg, "protocol-version") == 0)
1.416 djm 793: cp = xstrdup("2");
1.513 dtucker 794: else if (strcmp(optarg, "compression") == 0) {
795: cp = xstrdup(compression_alg_list(0));
796: len = strlen(cp);
797: for (n = 0; n < len; n++)
798: if (cp[n] == ',')
799: cp[n] = '\n';
800: } else if (strcmp(optarg, "help") == 0) {
1.491 djm 801: cp = xstrdup(
1.513 dtucker 802: "cipher\ncipher-auth\ncompression\nkex\n"
1.519 dtucker 803: "key\nkey-cert\nkey-plain\nkey-sig\nmac\n"
1.491 djm 804: "protocol-version\nsig");
1.416 djm 805: }
1.376 djm 806: if (cp == NULL)
807: fatal("Unsupported query \"%s\"", optarg);
808: printf("%s\n", cp);
809: free(cp);
810: exit(0);
1.31 markus 811: break;
812: case 'a':
813: options.forward_agent = 0;
1.53 markus 814: break;
815: case 'A':
816: options.forward_agent = 1;
1.31 markus 817: break;
818: case 'k':
1.204 dtucker 819: options.gss_deleg_creds = 0;
1.297 djm 820: break;
821: case 'K':
822: options.gss_authentication = 1;
823: options.gss_deleg_creds = 1;
1.31 markus 824: break;
825: case 'i':
1.490 dtucker 826: p = tilde_expand_filename(optarg, getuid());
1.505 deraadt 827: if (stat(p, &st) == -1)
1.128 fgsch 828: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 829: "not accessible: %s.\n", p,
1.231 otto 830: strerror(errno));
1.429 dtucker 831: else
832: add_identity_file(&options, NULL, p, 1);
833: free(p);
1.31 markus 834: break;
1.127 markus 835: case 'I':
1.333 markus 836: #ifdef ENABLE_PKCS11
1.422 dtucker 837: free(options.pkcs11_provider);
1.333 markus 838: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 839: #else
1.333 markus 840: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 841: #endif
1.127 markus 842: break;
1.443 djm 843: case 'J':
1.504 djm 844: if (options.jump_host != NULL) {
845: fatal("Only a single -J option is permitted "
846: "(use commas to separate multiple "
847: "jump hops)");
848: }
1.443 djm 849: if (options.proxy_command != NULL)
850: fatal("Cannot specify -J with ProxyCommand");
851: if (parse_jump(optarg, &options, 1) == -1)
852: fatal("Invalid -J argument");
853: options.proxy_command = xstrdup("none");
854: break;
1.31 markus 855: case 't':
1.359 djm 856: if (options.request_tty == REQUEST_TTY_YES)
857: options.request_tty = REQUEST_TTY_FORCE;
858: else
859: options.request_tty = REQUEST_TTY_YES;
1.31 markus 860: break;
861: case 'v':
1.197 markus 862: if (debug_flag == 0) {
1.66 markus 863: debug_flag = 1;
864: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 865: } else {
1.443 djm 866: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
867: debug_flag++;
1.197 markus 868: options.log_level++;
1.443 djm 869: }
1.197 markus 870: }
1.375 dtucker 871: break;
1.31 markus 872: case 'V':
1.209 markus 873: fprintf(stderr, "%s, %s\n",
1.402 markus 874: SSH_VERSION,
875: #ifdef WITH_OPENSSL
1.495 djm 876: OpenSSL_version(OPENSSL_VERSION)
1.402 markus 877: #else
878: "without OpenSSL"
879: #endif
880: );
1.31 markus 881: if (opt == 'V')
882: exit(0);
883: break;
1.255 reyk 884: case 'w':
1.256 reyk 885: if (options.tun_open == -1)
886: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 887: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 888: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 889: fprintf(stderr,
890: "Bad tun device '%s'\n", optarg);
1.257 dtucker 891: exit(255);
1.255 reyk 892: }
893: break;
1.331 dtucker 894: case 'W':
1.441 dtucker 895: if (options.stdio_forward_host != NULL)
1.332 djm 896: fatal("stdio forward already specified");
897: if (muxclient_command != 0)
898: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 899: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 900: options.stdio_forward_host = fwd.listen_host;
901: options.stdio_forward_port = fwd.listen_port;
1.378 djm 902: free(fwd.connect_host);
1.331 dtucker 903: } else {
904: fprintf(stderr,
905: "Bad stdio forwarding specification '%s'\n",
906: optarg);
907: exit(255);
908: }
1.359 djm 909: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 910: no_shell_flag = 1;
911: break;
1.31 markus 912: case 'q':
913: options.log_level = SYSLOG_LEVEL_QUIET;
914: break;
915: case 'e':
916: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 917: (u_char) optarg[1] >= 64 &&
918: (u_char) optarg[1] < 128)
1.78 markus 919: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 920: else if (strlen(optarg) == 1)
1.78 markus 921: options.escape_char = (u_char) optarg[0];
1.31 markus 922: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 923: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 924: else {
1.128 fgsch 925: fprintf(stderr, "Bad escape character '%s'.\n",
926: optarg);
1.257 dtucker 927: exit(255);
1.31 markus 928: }
929: break;
930: case 'c':
1.506 naddy 931: if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
1.420 djm 932: optarg + 1 : optarg)) {
933: fprintf(stderr, "Unknown cipher type '%s'\n",
934: optarg);
935: exit(255);
1.95 markus 936: }
1.456 djm 937: free(options.ciphers);
938: options.ciphers = xstrdup(optarg);
1.95 markus 939: break;
940: case 'm':
1.422 dtucker 941: if (mac_valid(optarg)) {
942: free(options.macs);
1.95 markus 943: options.macs = xstrdup(optarg);
1.422 dtucker 944: } else {
1.128 fgsch 945: fprintf(stderr, "Unknown mac type '%s'\n",
946: optarg);
1.257 dtucker 947: exit(255);
1.31 markus 948: }
949: break;
1.214 djm 950: case 'M':
1.242 djm 951: if (options.control_master == SSHCTL_MASTER_YES)
952: options.control_master = SSHCTL_MASTER_ASK;
953: else
954: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 955: break;
1.31 markus 956: case 'p':
1.465 millert 957: if (options.port == -1) {
958: options.port = a2port(optarg);
959: if (options.port <= 0) {
960: fprintf(stderr, "Bad port '%s'\n",
961: optarg);
962: exit(255);
963: }
1.109 markus 964: }
1.31 markus 965: break;
966: case 'l':
1.465 millert 967: if (options.user == NULL)
968: options.user = optarg;
1.31 markus 969: break;
1.141 stevesk 970:
971: case 'L':
1.324 djm 972: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 973: add_local_forward(&options, &fwd);
974: else {
1.128 fgsch 975: fprintf(stderr,
1.232 djm 976: "Bad local forwarding specification '%s'\n",
1.128 fgsch 977: optarg);
1.257 dtucker 978: exit(255);
1.31 markus 979: }
1.232 djm 980: break;
981:
982: case 'R':
1.464 markus 983: if (parse_forward(&fwd, optarg, 0, 1) ||
984: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 985: add_remote_forward(&options, &fwd);
986: } else {
1.128 fgsch 987: fprintf(stderr,
1.232 djm 988: "Bad remote forwarding specification "
989: "'%s'\n", optarg);
1.257 dtucker 990: exit(255);
1.31 markus 991: }
992: break;
1.108 markus 993:
994: case 'D':
1.324 djm 995: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 996: add_local_forward(&options, &fwd);
1.232 djm 997: } else {
1.322 stevesk 998: fprintf(stderr,
999: "Bad dynamic forwarding specification "
1000: "'%s'\n", optarg);
1.257 dtucker 1001: exit(255);
1.109 markus 1002: }
1.108 markus 1003: break;
1004:
1.31 markus 1005: case 'C':
1.513 dtucker 1006: #ifdef WITH_ZLIB
1.31 markus 1007: options.compression = 1;
1.513 dtucker 1008: #else
1009: error("Compression not supported, disabling.");
1010: #endif
1.31 markus 1011: break;
1.45 markus 1012: case 'N':
1013: no_shell_flag = 1;
1.359 djm 1014: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1015: break;
1016: case 'T':
1.359 djm 1017: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1018: break;
1.31 markus 1019: case 'o':
1.205 markus 1020: line = xstrdup(optarg);
1.408 djm 1021: if (process_config_line(&options, pw,
1022: host ? host : "", host ? host : "", line,
1023: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 1024: exit(255);
1.378 djm 1025: free(line);
1.31 markus 1026: break;
1.85 djm 1027: case 's':
1028: subsystem_flag = 1;
1.117 markus 1029: break;
1.214 djm 1030: case 'S':
1.431 mmcc 1031: free(options.control_path);
1.214 djm 1032: options.control_path = xstrdup(optarg);
1033: break;
1.117 markus 1034: case 'b':
1035: options.bind_address = optarg;
1.474 djm 1036: break;
1037: case 'B':
1038: options.bind_interface = optarg;
1.85 djm 1039: break;
1.139 markus 1040: case 'F':
1041: config = optarg;
1042: break;
1.31 markus 1043: default:
1044: usage();
1.1 deraadt 1045: }
1.31 markus 1046: }
1047:
1.462 djm 1048: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
1049: opt_terminated = 1;
1050:
1.128 fgsch 1051: ac -= optind;
1052: av += optind;
1053:
1.329 guenther 1054: if (ac > 0 && !host) {
1.465 millert 1055: int tport;
1056: char *tuser;
1057: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
1058: case -1:
1059: usage();
1060: break;
1061: case 0:
1062: if (options.user == NULL) {
1063: options.user = tuser;
1064: tuser = NULL;
1065: }
1066: free(tuser);
1067: if (options.port == -1 && tport != -1)
1068: options.port = tport;
1069: break;
1070: default:
1.128 fgsch 1071: p = xstrdup(*av);
1.188 markus 1072: cp = strrchr(p, '@');
1.465 millert 1073: if (cp != NULL) {
1074: if (cp == p)
1075: usage();
1076: if (options.user == NULL) {
1077: options.user = p;
1078: p = NULL;
1079: }
1080: *cp++ = '\0';
1081: host = xstrdup(cp);
1082: free(p);
1083: } else
1084: host = p;
1085: break;
1086: }
1.462 djm 1087: if (ac > 1 && !opt_terminated) {
1.189 millert 1088: optind = optreset = 1;
1.128 fgsch 1089: goto again;
1090: }
1.189 millert 1091: ac--, av++;
1.128 fgsch 1092: }
1093:
1.31 markus 1094: /* Check that we got a host name. */
1095: if (!host)
1096: usage();
1097:
1.385 djm 1098: host_arg = xstrdup(host);
1099:
1.402 markus 1100: #ifdef WITH_OPENSSL
1.350 djm 1101: OpenSSL_add_all_algorithms();
1.72 markus 1102: ERR_load_crypto_strings();
1.402 markus 1103: #endif
1.31 markus 1104:
1105: /* Initialize the command to execute on remote host. */
1.482 markus 1106: if ((command = sshbuf_new()) == NULL)
1107: fatal("sshbuf_new failed");
1.1 deraadt 1108:
1.33 markus 1109: /*
1110: * Save the command to execute on the remote host in a buffer. There
1111: * is no limit on the length of the command, except by the maximum
1112: * packet size. Also sets the tty flag if there is no command.
1113: */
1.128 fgsch 1114: if (!ac) {
1.31 markus 1115: /* No command specified - execute shell on a tty. */
1.85 djm 1116: if (subsystem_flag) {
1.128 fgsch 1117: fprintf(stderr,
1118: "You must specify a subsystem to invoke.\n");
1.85 djm 1119: usage();
1120: }
1.31 markus 1121: } else {
1.128 fgsch 1122: /* A command has been specified. Store it into the buffer. */
1123: for (i = 0; i < ac; i++) {
1.482 markus 1124: if ((r = sshbuf_putf(command, "%s%s",
1125: i ? " " : "", av[i])) != 0)
1126: fatal("%s: buffer error: %s",
1127: __func__, ssh_err(r));
1.31 markus 1128: }
1129: }
1130:
1.101 markus 1131: /*
1132: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1133: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1134: */
1.375 dtucker 1135: if (use_syslog && logfile != NULL)
1136: fatal("Can't specify both -y and -E");
1.422 dtucker 1137: if (logfile != NULL)
1.375 dtucker 1138: log_redirect_stderr_to(logfile);
1.325 markus 1139: log_init(argv0,
1.468 djm 1140: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1141: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1142: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1143: SYSLOG_FACILITY_USER : options.log_facility,
1144: !use_syslog);
1.375 dtucker 1145:
1146: if (debug_flag)
1.402 markus 1147: logit("%s, %s", SSH_VERSION,
1148: #ifdef WITH_OPENSSL
1.495 djm 1149: OpenSSL_version(OPENSSL_VERSION)
1.402 markus 1150: #else
1151: "without OpenSSL"
1152: #endif
1153: );
1.31 markus 1154:
1.400 djm 1155: /* Parse the configuration files */
1.496 djm 1156: process_config_files(host_arg, pw, 0, &want_final_pass);
1157: if (want_final_pass)
1158: debug("configuration requests final Match pass");
1.400 djm 1159:
1160: /* Hostname canonicalisation needs a few options filled. */
1161: fill_default_options_for_canonicalization(&options);
1162:
1163: /* If the user has replaced the hostname then take it into use now */
1164: if (options.hostname != NULL) {
1165: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1166: cp = percent_expand(options.hostname,
1167: "h", host, (char *)NULL);
1168: free(host);
1169: host = cp;
1.408 djm 1170: free(options.hostname);
1171: options.hostname = xstrdup(host);
1.400 djm 1172: }
1173:
1.470 djm 1174: /* Don't lowercase addresses, they will be explicitly canonicalised */
1175: if ((was_addr = is_addr(host)) == 0)
1176: lowercase(host);
1177:
1178: /*
1179: * Try to canonicalize if requested by configuration or the
1180: * hostname is an address.
1181: */
1182: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1183: addrs = resolve_canonicalize(&host, options.port);
1184:
1.139 markus 1185: /*
1.401 djm 1186: * If CanonicalizePermittedCNAMEs have been specified but
1187: * other canonicalization did not happen (by not being requested
1188: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1189: * as a result of CNAME following.
1.401 djm 1190: *
1191: * Try to resolve the bare hostname name using the system resolver's
1192: * usual search rules and then apply the CNAME follow rules.
1193: *
1194: * Skip the lookup if a ProxyCommand is being used unless the user
1195: * has specifically requested canonicalisation for this case via
1196: * CanonicalizeHostname=always
1.139 markus 1197: */
1.443 djm 1198: direct = option_clear_or_none(options.proxy_command) &&
1199: options.jump_host == NULL;
1200: if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1201: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1202: if ((addrs = resolve_host(host, options.port,
1.493 djm 1203: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1204: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1205: if (direct)
1.403 djm 1206: cleanup_exit(255); /* logged in resolve_host */
1207: } else
1.443 djm 1208: check_follow_cname(direct, &host, cname);
1.400 djm 1209: }
1.139 markus 1210:
1.400 djm 1211: /*
1.408 djm 1212: * If canonicalisation is enabled then re-parse the configuration
1213: * files as new stanzas may match.
1.400 djm 1214: */
1.496 djm 1215: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1216: debug("hostname canonicalisation enabled, "
1217: "will re-parse configuration");
1218: want_final_pass = 1;
1219: }
1220:
1221: if (want_final_pass) {
1222: debug("re-parsing configuration");
1.408 djm 1223: free(options.hostname);
1224: options.hostname = xstrdup(host);
1.496 djm 1225: process_config_files(host_arg, pw, 1, NULL);
1.408 djm 1226: /*
1227: * Address resolution happens early with canonicalisation
1228: * enabled and the port number may have changed since, so
1229: * reset it in address list
1230: */
1231: if (addrs != NULL && options.port > 0)
1232: set_addrinfo_port(addrs, options.port);
1.139 markus 1233: }
1.31 markus 1234:
1235: /* Fill configuration defaults. */
1236: fill_default_options(&options);
1.443 djm 1237:
1.534 dtucker 1238: if (options.user == NULL)
1239: options.user = xstrdup(pw->pw_name);
1240:
1.443 djm 1241: /*
1242: * If ProxyJump option specified, then construct a ProxyCommand now.
1243: */
1244: if (options.jump_host != NULL) {
1245: char port_s[8];
1.534 dtucker 1246: const char *jumpuser = options.jump_user, *sshbin = argv0;
1.520 dtucker 1247: int port = options.port, jumpport = options.jump_port;
1248:
1249: if (port <= 0)
1250: port = default_ssh_port();
1251: if (jumpport <= 0)
1252: jumpport = default_ssh_port();
1.534 dtucker 1253: if (jumpuser == NULL)
1254: jumpuser = options.user;
1255: if (strcmp(options.jump_host, host) == 0 && port == jumpport &&
1256: strcmp(options.user, jumpuser) == 0)
1.520 dtucker 1257: fatal("jumphost loop via %s", options.jump_host);
1.478 djm 1258:
1259: /*
1260: * Try to use SSH indicated by argv[0], but fall back to
1261: * "ssh" if it appears unavailable.
1262: */
1263: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1264: sshbin = "ssh";
1.443 djm 1265:
1266: /* Consistency check */
1267: if (options.proxy_command != NULL)
1268: fatal("inconsistent options: ProxyCommand+ProxyJump");
1269: /* Never use FD passing for ProxyJump */
1270: options.proxy_use_fdpass = 0;
1271: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1272: xasprintf(&options.proxy_command,
1.478 djm 1273: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1274: sshbin,
1.443 djm 1275: /* Optional "-l user" argument if jump_user set */
1276: options.jump_user == NULL ? "" : " -l ",
1277: options.jump_user == NULL ? "" : options.jump_user,
1278: /* Optional "-p port" argument if jump_port set */
1279: options.jump_port <= 0 ? "" : " -p ",
1280: options.jump_port <= 0 ? "" : port_s,
1281: /* Optional additional jump hosts ",..." */
1282: options.jump_extra == NULL ? "" : " -J ",
1283: options.jump_extra == NULL ? "" : options.jump_extra,
1284: /* Optional "-F" argumment if -F specified */
1285: config == NULL ? "" : " -F ",
1286: config == NULL ? "" : config,
1287: /* Optional "-v" arguments if -v set */
1288: debug_flag ? " -" : "",
1289: debug_flag, "vvv",
1290: /* Mandatory hostname */
1291: options.jump_host);
1292: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1293: options.proxy_command);
1294: }
1.31 markus 1295:
1.400 djm 1296: if (options.port == 0)
1297: options.port = default_ssh_port();
1.463 djm 1298: channel_set_af(ssh, options.address_family);
1.196 djm 1299:
1.383 djm 1300: /* Tidy and check options */
1301: if (options.host_key_alias != NULL)
1302: lowercase(options.host_key_alias);
1303: if (options.proxy_command != NULL &&
1304: strcmp(options.proxy_command, "-") == 0 &&
1305: options.proxy_use_fdpass)
1306: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.516 markus 1307: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1308: if (options.control_persist && options.control_path != NULL) {
1309: debug("UpdateHostKeys=ask is incompatible with "
1310: "ControlPersist; disabling");
1311: options.update_hostkeys = 0;
1312: } else if (sshbuf_len(command) != 0 ||
1313: options.remote_command != NULL ||
1314: options.request_tty == REQUEST_TTY_NO) {
1315: debug("UpdateHostKeys=ask is incompatible with "
1316: "remote command execution; disabling");
1.517 djm 1317: options.update_hostkeys = 0;
1318: } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1319: /* no point logging anything; user won't see it */
1.516 markus 1320: options.update_hostkeys = 0;
1321: }
1.415 djm 1322: }
1.430 djm 1323: if (options.connection_attempts <= 0)
1324: fatal("Invalid number of ConnectionAttempts");
1325:
1.482 markus 1326: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1327: fatal("Cannot execute command-line and remote command.");
1328:
1329: /* Cannot fork to background if no command. */
1.482 markus 1330: if (fork_after_authentication_flag && sshbuf_len(command) == 0 &&
1.461 bluhm 1331: options.remote_command == NULL && !no_shell_flag)
1332: fatal("Cannot fork into background without a command "
1333: "to execute.");
1334:
1.31 markus 1335: /* reinit */
1.452 dtucker 1336: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.370 djm 1337:
1338: if (options.request_tty == REQUEST_TTY_YES ||
1339: options.request_tty == REQUEST_TTY_FORCE)
1340: tty_flag = 1;
1341:
1342: /* Allocate a tty by default if no command specified. */
1.482 markus 1343: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1344: tty_flag = options.request_tty != REQUEST_TTY_NO;
1345:
1346: /* Force no tty */
1.447 markus 1347: if (options.request_tty == REQUEST_TTY_NO ||
1348: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
1.370 djm 1349: tty_flag = 0;
1350: /* Do not allocate a tty if stdin is not a tty. */
1351: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
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 */
1.358 djm 1360: if (gethostname(thishost, sizeof(thishost)) == -1)
1361: fatal("gethostname: %s", strerror(errno));
1362: strlcpy(shorthost, thishost, sizeof(shorthost));
1363: shorthost[strcspn(thishost, ".")] = '\0';
1364: snprintf(portstr, sizeof(portstr), "%d", options.port);
1.479 djm 1365: snprintf(uidstr, sizeof(uidstr), "%llu",
1366: (unsigned long long)pw->pw_uid);
1.533 dtucker 1367: keyalias = options.host_key_alias ? options.host_key_alias : host_arg;
1.358 djm 1368:
1.522 dtucker 1369: conn_hash_hex = ssh_connection_hash(thishost, host, portstr,
1370: options.user);
1.405 djm 1371:
1.466 djm 1372: /*
1373: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1374: * after port-forwarding is set up, so it may pick up any local
1375: * tunnel interface name allocated.
1376: */
1.461 bluhm 1377: if (options.remote_command != NULL) {
1378: debug3("expanding RemoteCommand: %s", options.remote_command);
1379: cp = options.remote_command;
1.527 dtucker 1380: options.remote_command = default_client_percent_expand(cp,
1381: pw->pw_dir, host, options.user, pw->pw_name);
1.461 bluhm 1382: debug3("expanded RemoteCommand: %s", options.remote_command);
1383: free(cp);
1.482 markus 1384: if ((r = sshbuf_put(command, options.remote_command,
1385: strlen(options.remote_command))) != 0)
1386: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.304 dtucker 1387: }
1.31 markus 1388:
1.214 djm 1389: if (options.control_path != NULL) {
1.490 dtucker 1390: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1391: free(options.control_path);
1.528 dtucker 1392: options.control_path = default_client_percent_dollar_expand(cp,
1.527 dtucker 1393: pw->pw_dir, host, options.user, pw->pw_name);
1.378 djm 1394: free(cp);
1.214 djm 1395: }
1.408 djm 1396:
1.522 dtucker 1397: if (options.identity_agent != NULL) {
1398: p = tilde_expand_filename(options.identity_agent, getuid());
1.528 dtucker 1399: cp = default_client_percent_dollar_expand(p,
1.527 dtucker 1400: pw->pw_dir, host, options.user, pw->pw_name);
1.522 dtucker 1401: free(p);
1402: free(options.identity_agent);
1403: options.identity_agent = cp;
1404: }
1405:
1406: if (options.forward_agent_sock_path != NULL) {
1407: p = tilde_expand_filename(options.forward_agent_sock_path,
1408: getuid());
1.528 dtucker 1409: cp = default_client_percent_dollar_expand(p,
1.527 dtucker 1410: pw->pw_dir, host, options.user, pw->pw_name);
1.522 dtucker 1411: free(p);
1412: free(options.forward_agent_sock_path);
1413: options.forward_agent_sock_path = cp;
1.532 dtucker 1414: }
1415:
1416: for (j = 0; j < options.num_user_hostfiles; j++) {
1417: if (options.user_hostfiles[j] != NULL) {
1418: cp = tilde_expand_filename(options.user_hostfiles[j],
1419: getuid());
1420: p = default_client_percent_dollar_expand(cp,
1421: pw->pw_dir, host, options.user, pw->pw_name);
1422: if (strcmp(options.user_hostfiles[j], p) != 0)
1423: debug3("expanded UserKnownHostsFile '%s' -> "
1424: "'%s'", options.user_hostfiles[j], p);
1425: free(options.user_hostfiles[j]);
1426: free(cp);
1427: options.user_hostfiles[j] = p;
1428: }
1.522 dtucker 1429: }
1430:
1.527 dtucker 1431: for (i = 0; i < options.num_local_forwards; i++) {
1432: if (options.local_forwards[i].listen_path != NULL) {
1433: cp = options.local_forwards[i].listen_path;
1434: p = options.local_forwards[i].listen_path =
1435: default_client_percent_expand(cp,
1436: pw->pw_dir, host, options.user, pw->pw_name);
1437: if (strcmp(cp, p) != 0)
1438: debug3("expanded LocalForward listen path "
1439: "'%s' -> '%s'", cp, p);
1440: free(cp);
1441: }
1442: if (options.local_forwards[i].connect_path != NULL) {
1443: cp = options.local_forwards[i].connect_path;
1444: p = options.local_forwards[i].connect_path =
1445: default_client_percent_expand(cp,
1446: pw->pw_dir, host, options.user, pw->pw_name);
1447: if (strcmp(cp, p) != 0)
1448: debug3("expanded LocalForward connect path "
1449: "'%s' -> '%s'", cp, p);
1450: free(cp);
1451: }
1452: }
1453:
1454: for (i = 0; i < options.num_remote_forwards; i++) {
1455: if (options.remote_forwards[i].listen_path != NULL) {
1456: cp = options.remote_forwards[i].listen_path;
1457: p = options.remote_forwards[i].listen_path =
1458: default_client_percent_expand(cp,
1459: pw->pw_dir, host, options.user, pw->pw_name);
1460: if (strcmp(cp, p) != 0)
1461: debug3("expanded RemoteForward listen path "
1462: "'%s' -> '%s'", cp, p);
1463: free(cp);
1464: }
1465: if (options.remote_forwards[i].connect_path != NULL) {
1466: cp = options.remote_forwards[i].connect_path;
1467: p = options.remote_forwards[i].connect_path =
1468: default_client_percent_expand(cp,
1469: pw->pw_dir, host, options.user, pw->pw_name);
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:
1.303 djm 1520: timeout_ms = options.connection_timeout * 1000;
1521:
1.77 markus 1522: /* Open a connection to the remote host. */
1.511 beck 1523: if (ssh_connect(ssh, host, host_arg, addrs, &hostaddr, options.port,
1.385 djm 1524: options.address_family, options.connection_attempts,
1.488 dtucker 1525: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1526: exit(255);
1.31 markus 1527:
1.391 djm 1528: if (addrs != NULL)
1529: freeaddrinfo(addrs);
1530:
1.499 djm 1531: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1532: options.server_alive_count_max);
1533:
1.303 djm 1534: if (timeout_ms > 0)
1535: debug3("timeout: %d ms remain after connect", timeout_ms);
1536:
1.33 markus 1537: /*
1.485 dtucker 1538: * If we successfully made the connection and we have hostbased auth
1539: * enabled, load the public keys so we can later use the ssh-keysign
1540: * helper to sign challenges.
1.33 markus 1541: */
1.112 markus 1542: sensitive_data.nkeys = 0;
1543: sensitive_data.keys = NULL;
1.457 djm 1544: if (options.hostbased_authentication) {
1.486 dtucker 1545: sensitive_data.nkeys = 10;
1.274 deraadt 1546: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.483 markus 1547: sizeof(struct sshkey));
1548:
1549: /* XXX check errors? */
1.486 dtucker 1550: #define L_PUBKEY(p,o) do { \
1551: if ((o) >= sensitive_data.nkeys) \
1552: fatal("%s pubkey out of array bounds", __func__); \
1.483 markus 1553: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.486 dtucker 1554: p, "pubkey"); \
1555: } while (0)
1556: #define L_CERT(p,o) do { \
1557: if ((o) >= sensitive_data.nkeys) \
1558: fatal("%s cert out of array bounds", __func__); \
1559: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), p, "cert"); \
1560: } while (0)
1.177 markus 1561:
1.485 dtucker 1562: if (options.hostbased_authentication == 1) {
1.486 dtucker 1563: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1564: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1565: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1566: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1567: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1568: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1569: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1570: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1571: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1572: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.173 markus 1573: }
1.367 djm 1574: }
1.31 markus 1575:
1.104 markus 1576: /* load options.identity_files */
1.466 djm 1577: load_public_identity_files(pw);
1.439 markus 1578:
1.476 djm 1579: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1580: if (options.identity_agent &&
1581: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1582: if (strcmp(options.identity_agent, "none") == 0) {
1583: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1584: } else {
1.522 dtucker 1585: cp = options.identity_agent;
1.528 dtucker 1586: /* legacy (limited) format */
1587: if (cp[0] == '$' && cp[1] != '{') {
1.494 djm 1588: if (!valid_env_name(cp + 1)) {
1589: fatal("Invalid IdentityAgent "
1590: "environment variable name %s", cp);
1591: }
1592: if ((p = getenv(cp + 1)) == NULL)
1593: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1594: else
1595: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1596: } else {
1597: /* identity_agent specifies a path directly */
1598: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1599: }
1.510 djm 1600: }
1601: }
1602:
1.522 dtucker 1603: if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1.526 djm 1604: cp = options.forward_agent_sock_path;
1.510 djm 1605: if (cp[0] == '$') {
1606: if (!valid_env_name(cp + 1)) {
1607: fatal("Invalid ForwardAgent environment variable name %s", cp);
1608: }
1609: if ((p = getenv(cp + 1)) != NULL)
1610: forward_agent_sock_path = p;
1611: else
1612: options.forward_agent = 0;
1613: free(cp);
1614: } else {
1615: forward_agent_sock_path = cp;
1.439 markus 1616: }
1617: }
1.104 markus 1618:
1619: /* Expand ~ in known host file names. */
1.361 djm 1620: tilde_expand_paths(options.system_hostfiles,
1621: options.num_system_hostfiles);
1622: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1623:
1.512 dtucker 1624: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1625: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1626:
1.316 djm 1627: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1628: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1629: options.port, pw, timeout_ms);
1.339 djm 1630:
1.499 djm 1631: if (ssh_packet_connection_is_on_socket(ssh)) {
1.339 djm 1632: verbose("Authenticated to %s ([%s]:%d).", host,
1.437 djm 1633: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
1.339 djm 1634: } else {
1635: verbose("Authenticated to %s (via proxy).", host);
1636: }
1.31 markus 1637:
1.112 markus 1638: /* We no longer need the private host keys. Clear them now. */
1639: if (sensitive_data.nkeys != 0) {
1640: for (i = 0; i < sensitive_data.nkeys; i++) {
1641: if (sensitive_data.keys[i] != NULL) {
1642: /* Destroys contents safely */
1643: debug3("clear hostkey %d", i);
1.483 markus 1644: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1645: sensitive_data.keys[i] = NULL;
1646: }
1647: }
1.378 djm 1648: free(sensitive_data.keys);
1.134 markus 1649: }
1650: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1651: free(options.identity_files[i]);
1652: options.identity_files[i] = NULL;
1.134 markus 1653: if (options.identity_keys[i]) {
1.483 markus 1654: sshkey_free(options.identity_keys[i]);
1.134 markus 1655: options.identity_keys[i] = NULL;
1656: }
1.112 markus 1657: }
1.426 djm 1658: for (i = 0; i < options.num_certificate_files; i++) {
1659: free(options.certificate_files[i]);
1660: options.certificate_files[i] = NULL;
1661: }
1.31 markus 1662:
1.447 markus 1663: skip_connect:
1.466 djm 1664: exit_status = ssh_session2(ssh, pw);
1.499 djm 1665: ssh_packet_close(ssh);
1.186 djm 1666:
1.312 djm 1667: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1668: unlink(options.control_path);
1669:
1.353 djm 1670: /* Kill ProxyCommand if it is running. */
1671: ssh_kill_proxy_command();
1.186 djm 1672:
1.45 markus 1673: return exit_status;
1674: }
1675:
1.344 djm 1676: static void
1677: control_persist_detach(void)
1678: {
1679: pid_t pid;
1.438 djm 1680: int devnull, keep_stderr;
1.344 djm 1681:
1682: debug("%s: backgrounding master process", __func__);
1683:
1.473 djm 1684: /*
1685: * master (current process) into the background, and make the
1686: * foreground process a client of the backgrounded master.
1687: */
1.344 djm 1688: switch ((pid = fork())) {
1689: case -1:
1690: fatal("%s: fork: %s", __func__, strerror(errno));
1691: case 0:
1692: /* Child: master process continues mainloop */
1.473 djm 1693: break;
1694: default:
1.531 djm 1695: /* Parent: set up mux client to connect to backgrounded master */
1.344 djm 1696: debug2("%s: background process is %ld", __func__, (long)pid);
1697: stdin_null_flag = ostdin_null_flag;
1.359 djm 1698: options.request_tty = orequest_tty;
1.344 djm 1699: tty_flag = otty_flag;
1.473 djm 1700: close(muxserver_sock);
1701: muxserver_sock = -1;
1.351 markus 1702: options.control_master = SSHCTL_MASTER_NO;
1.473 djm 1703: muxclient(options.control_path);
1.344 djm 1704: /* muxclient() doesn't return on success. */
1.473 djm 1705: fatal("Failed to connect to new control master");
1706: }
1.346 djm 1707: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1708: error("%s: open(\"/dev/null\"): %s", __func__,
1709: strerror(errno));
1710: } else {
1.438 djm 1711: keep_stderr = log_is_on_stderr() && debug_flag;
1.346 djm 1712: if (dup2(devnull, STDIN_FILENO) == -1 ||
1.438 djm 1713: dup2(devnull, STDOUT_FILENO) == -1 ||
1714: (!keep_stderr && dup2(devnull, STDERR_FILENO) == -1))
1.346 djm 1715: error("%s: dup2: %s", __func__, strerror(errno));
1716: if (devnull > STDERR_FILENO)
1717: close(devnull);
1718: }
1.381 djm 1719: daemon(1, 1);
1.362 djm 1720: setproctitle("%s [mux]", options.control_path);
1.344 djm 1721: }
1722:
1723: /* Do fork() after authentication. Used by "ssh -f" */
1724: static void
1725: fork_postauth(void)
1726: {
1.535 djm 1727: int devnull, keep_stderr;
1728:
1.344 djm 1729: if (need_controlpersist_detach)
1730: control_persist_detach();
1731: debug("forking to background");
1732: fork_after_authentication_flag = 0;
1.505 deraadt 1733: if (daemon(1, 1) == -1)
1.344 djm 1734: fatal("daemon() failed: %.200s", strerror(errno));
1.535 djm 1735: if ((devnull = open(_PATH_DEVNULL, O_WRONLY)) == -1)
1736: error("%s: open %s: %s", __func__,
1737: _PATH_DEVNULL, strerror(errno));
1738: else {
1739: keep_stderr = log_is_on_stderr() && debug_flag;
1.536 ! djm 1740: if (dup2(devnull, STDIN_FILENO) == -1 ||
! 1741: dup2(devnull, STDOUT_FILENO) == -1 ||
1.535 djm 1742: (!keep_stderr && dup2(devnull, STDOUT_FILENO) == -1))
1743: fatal("%s: dup2() stdio failed", __func__);
1744: if (devnull > STDERR_FILENO)
1745: close(devnull);
1746: }
1.344 djm 1747: }
1748:
1.523 djm 1749: static void
1750: forwarding_success(void)
1751: {
1.524 djm 1752: if (forward_confirms_pending == -1)
1753: return;
1754: if (--forward_confirms_pending == 0) {
1.525 djm 1755: debug("%s: all expected forwarding replies received", __func__);
1.523 djm 1756: if (fork_after_authentication_flag)
1757: fork_postauth();
1.524 djm 1758: } else {
1759: debug2("%s: %d expected forwarding replies remaining",
1760: __func__, forward_confirms_pending);
1.523 djm 1761: }
1762: }
1763:
1.315 djm 1764: /* Callback for remote forward global requests */
1765: static void
1.463 djm 1766: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1767: {
1.406 millert 1768: struct Forward *rfwd = (struct Forward *)ctxt;
1.499 djm 1769: u_int port;
1770: int r;
1.315 djm 1771:
1.324 djm 1772: /* XXX verbose() on failure? */
1.404 markus 1773: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1774: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1775: rfwd->listen_path ? rfwd->listen_path :
1776: rfwd->listen_host ? rfwd->listen_host : "",
1777: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1778: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1779: rfwd->connect_host, rfwd->connect_port);
1780: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1781: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1.499 djm 1782: if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1783: fatal("%s: %s", __func__, ssh_err(r));
1784: if (port > 65535) {
1785: error("Invalid allocated port %u for remote "
1786: "forward to %s:%d", port,
1787: rfwd->connect_host, rfwd->connect_port);
1788: /* Ensure failure processing runs below */
1789: type = SSH2_MSG_REQUEST_FAILURE;
1790: channel_update_permission(ssh,
1791: rfwd->handle, -1);
1792: } else {
1793: rfwd->allocated_port = (int)port;
1794: logit("Allocated port %u for remote "
1795: "forward to %s:%d",
1796: rfwd->allocated_port, rfwd->connect_host,
1797: rfwd->connect_port);
1798: channel_update_permission(ssh,
1799: rfwd->handle, rfwd->allocated_port);
1800: }
1.366 markus 1801: } else {
1.480 djm 1802: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1803: }
1.324 djm 1804: }
1.468 djm 1805:
1.315 djm 1806: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1807: if (options.exit_on_forward_failure) {
1808: if (rfwd->listen_path != NULL)
1809: fatal("Error: remote port forwarding failed "
1810: "for listen path %s", rfwd->listen_path);
1811: else
1812: fatal("Error: remote port forwarding failed "
1813: "for listen port %d", rfwd->listen_port);
1814: } else {
1815: if (rfwd->listen_path != NULL)
1816: logit("Warning: remote port forwarding failed "
1817: "for listen path %s", rfwd->listen_path);
1818: else
1819: logit("Warning: remote port forwarding failed "
1820: "for listen port %d", rfwd->listen_port);
1821: }
1.315 djm 1822: }
1.523 djm 1823: forwarding_success();
1.315 djm 1824: }
1825:
1.126 itojun 1826: static void
1.463 djm 1827: client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
1.331 dtucker 1828: {
1829: debug("stdio forwarding: done");
1830: cleanup_exit(0);
1831: }
1832:
1.368 djm 1833: static void
1.463 djm 1834: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1835: {
1836: if (!success)
1837: fatal("stdio forwarding failed");
1838: }
1839:
1840: static void
1.523 djm 1841: ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
1842: {
1843: if (!success) {
1844: error("Tunnel forwarding failed");
1845: if (options.exit_on_forward_failure)
1846: cleanup_exit(255);
1847: }
1848:
1849: debug("%s: tunnel forward established, id=%d", __func__, id);
1850: forwarding_success();
1851: }
1852:
1853: static void
1.463 djm 1854: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1855: {
1856: Channel *c;
1.332 djm 1857: int in, out;
1.331 dtucker 1858:
1.441 dtucker 1859: if (options.stdio_forward_host == NULL)
1.368 djm 1860: return;
1861:
1.441 dtucker 1862: debug3("%s: %s:%d", __func__, options.stdio_forward_host,
1863: options.stdio_forward_port);
1.332 djm 1864:
1.505 deraadt 1865: if ((in = dup(STDIN_FILENO)) == -1 ||
1866: (out = dup(STDOUT_FILENO)) == -1)
1.332 djm 1867: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.463 djm 1868: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.441 dtucker 1869: options.stdio_forward_port, in, out)) == NULL)
1.368 djm 1870: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.463 djm 1871: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1872: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1873: }
1874:
1875: static void
1.466 djm 1876: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1877: {
1.86 markus 1878: int success = 0;
1.70 markus 1879: int i;
1.331 dtucker 1880:
1.524 djm 1881: if (options.exit_on_forward_failure)
1882: forward_confirms_pending = 0; /* track pending requests */
1.70 markus 1883: /* Initiate local TCP/IP port forwardings. */
1884: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1885: debug("Local connections to %.200s:%d forwarded to remote "
1886: "address %.200s:%d",
1.406 millert 1887: (options.local_forwards[i].listen_path != NULL) ?
1888: options.local_forwards[i].listen_path :
1.234 deraadt 1889: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1890: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1891: options.local_forwards[i].listen_host,
1892: options.local_forwards[i].listen_port,
1.406 millert 1893: (options.local_forwards[i].connect_path != NULL) ?
1894: options.local_forwards[i].connect_path :
1.232 djm 1895: options.local_forwards[i].connect_host,
1896: options.local_forwards[i].connect_port);
1.463 djm 1897: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1898: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1899: }
1.283 markus 1900: if (i > 0 && success != i && options.exit_on_forward_failure)
1901: fatal("Could not request local forwarding.");
1.86 markus 1902: if (i > 0 && success == 0)
1903: error("Could not request local forwarding.");
1.70 markus 1904:
1905: /* Initiate remote TCP/IP port forwardings. */
1906: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1907: debug("Remote connections from %.200s:%d forwarded to "
1908: "local address %.200s:%d",
1.406 millert 1909: (options.remote_forwards[i].listen_path != NULL) ?
1910: options.remote_forwards[i].listen_path :
1.248 djm 1911: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1912: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1913: options.remote_forwards[i].listen_port,
1.406 millert 1914: (options.remote_forwards[i].connect_path != NULL) ?
1915: options.remote_forwards[i].connect_path :
1.232 djm 1916: options.remote_forwards[i].connect_host,
1917: options.remote_forwards[i].connect_port);
1.523 djm 1918: if ((options.remote_forwards[i].handle =
1.463 djm 1919: channel_request_remote_forwarding(ssh,
1.523 djm 1920: &options.remote_forwards[i])) >= 0) {
1.463 djm 1921: client_register_global_confirm(
1922: ssh_confirm_remote_forward,
1.366 markus 1923: &options.remote_forwards[i]);
1.523 djm 1924: forward_confirms_pending++;
1925: } else if (options.exit_on_forward_failure)
1926: fatal("Could not request remote forwarding.");
1927: else
1928: logit("Warning: Could not request remote forwarding.");
1.70 markus 1929: }
1.301 djm 1930:
1931: /* Initiate tunnel forwarding. */
1932: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1933: if ((*ifname = client_request_tun_fwd(ssh,
1934: options.tun_open, options.tun_local,
1.523 djm 1935: options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
1936: forward_confirms_pending++;
1937: else if (options.exit_on_forward_failure)
1938: fatal("Could not request tunnel forwarding.");
1939: else
1940: error("Could not request tunnel forwarding.");
1.524 djm 1941: }
1942: if (forward_confirms_pending > 0) {
1943: debug("%s: expecting replies for %d forwards", __func__,
1944: forward_confirms_pending);
1.468 djm 1945: }
1.70 markus 1946: }
1947:
1.126 itojun 1948: static void
1.70 markus 1949: check_agent_present(void)
1950: {
1.412 djm 1951: int r;
1952:
1.70 markus 1953: if (options.forward_agent) {
1.254 djm 1954: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1955: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1956: options.forward_agent = 0;
1.412 djm 1957: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1958: debug("ssh_get_authentication_socket: %s",
1959: ssh_err(r));
1960: }
1.70 markus 1961: }
1962: }
1963:
1.214 djm 1964: static void
1.463 djm 1965: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 1966: {
1.215 djm 1967: extern char **environ;
1.243 djm 1968: const char *display;
1.499 djm 1969: int r, interactive = tty_flag;
1.433 djm 1970: char *proto = NULL, *data = NULL;
1.337 djm 1971:
1972: if (!success)
1973: return; /* No need for error message, channels code sens one */
1.215 djm 1974:
1.248 djm 1975: display = getenv("DISPLAY");
1.417 djm 1976: if (display == NULL && options.forward_x11)
1977: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 1978: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 1979: options.xauth_location, options.forward_x11_trusted,
1980: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 1981: /* Request forwarding with authentication spoofing. */
1.316 djm 1982: debug("Requesting X11 forwarding with authentication "
1983: "spoofing.");
1.463 djm 1984: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 1985: data, 1);
1.463 djm 1986: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 1987: /* XXX exit_on_forward_failure */
1.80 markus 1988: interactive = 1;
1.50 markus 1989: }
1990:
1.70 markus 1991: check_agent_present();
1992: if (options.forward_agent) {
1993: debug("Requesting authentication agent forwarding.");
1.463 djm 1994: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 1995: if ((r = sshpkt_send(ssh)) != 0)
1996: fatal("%s: %s", __func__, ssh_err(r));
1.212 djm 1997: }
1.369 dtucker 1998:
1999: /* Tell the packet module whether this is an interactive session. */
1.499 djm 2000: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 2001: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 2002:
1.463 djm 2003: client_session2_setup(ssh, id, tty_flag, subsystem_flag, getenv("TERM"),
1.482 markus 2004: NULL, fileno(stdin), command, environ);
1.45 markus 2005: }
2006:
1.143 markus 2007: /* open new channel for a session */
1.126 itojun 2008: static int
1.463 djm 2009: ssh_session2_open(struct ssh *ssh)
1.45 markus 2010: {
1.118 markus 2011: Channel *c;
2012: int window, packetmax, in, out, err;
1.60 markus 2013:
1.62 markus 2014: if (stdin_null_flag) {
1.93 itojun 2015: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 2016: } else {
2017: in = dup(STDIN_FILENO);
2018: }
1.60 markus 2019: out = dup(STDOUT_FILENO);
2020: err = dup(STDERR_FILENO);
1.45 markus 2021:
1.505 deraadt 2022: if (in == -1 || out == -1 || err == -1)
1.62 markus 2023: fatal("dup() in/out/err failed");
1.45 markus 2024:
1.69 markus 2025: /* enable nonblocking unless tty */
2026: if (!isatty(in))
2027: set_nonblock(in);
2028: if (!isatty(out))
2029: set_nonblock(out);
2030: if (!isatty(err))
2031: set_nonblock(err);
2032:
1.65 markus 2033: window = CHAN_SES_WINDOW_DEFAULT;
2034: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 2035: if (tty_flag) {
2036: window >>= 1;
2037: packetmax >>= 1;
1.45 markus 2038: }
1.463 djm 2039: c = channel_new(ssh,
1.45 markus 2040: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 2041: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 2042: "client-session", /*nonblock*/0);
1.45 markus 2043:
1.463 djm 2044: debug3("%s: channel_new: %d", __func__, c->self);
1.106 markus 2045:
1.463 djm 2046: channel_send_open(ssh, c->self);
1.143 markus 2047: if (!no_shell_flag)
1.463 djm 2048: channel_register_open_confirm(ssh, c->self,
1.310 djm 2049: ssh_session2_setup, NULL);
1.106 markus 2050:
1.118 markus 2051: return c->self;
1.106 markus 2052: }
2053:
1.126 itojun 2054: static int
1.466 djm 2055: ssh_session2(struct ssh *ssh, struct passwd *pw)
1.106 markus 2056: {
1.499 djm 2057: int r, devnull, id = -1;
1.466 djm 2058: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 2059:
2060: /* XXX should be pre-session */
1.368 djm 2061: if (!options.control_persist)
1.463 djm 2062: ssh_init_stdio_forwarding(ssh);
1.466 djm 2063:
2064: ssh_init_forwarding(ssh, &tun_fwd_ifname);
2065:
2066: if (options.local_command != NULL) {
2067: debug3("expanding LocalCommand: %s", options.local_command);
2068: cp = options.local_command;
2069: options.local_command = percent_expand(cp,
1.522 dtucker 2070: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS,
1.466 djm 2071: "d", pw->pw_dir,
2072: "h", host,
2073: "r", options.user,
2074: "u", pw->pw_name,
2075: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2076: (char *)NULL);
2077: debug3("expanded LocalCommand: %s", options.local_command);
2078: free(cp);
2079: }
1.106 markus 2080:
1.344 djm 2081: /* Start listening for multiplex clients */
1.499 djm 2082: if (!ssh_packet_get_mux(ssh))
1.463 djm 2083: muxserver_listen(ssh);
1.344 djm 2084:
1.473 djm 2085: /*
1.368 djm 2086: * If we are in control persist mode and have a working mux listen
2087: * socket, then prepare to background ourselves and have a foreground
1.531 djm 2088: * client attach as a control client.
1.368 djm 2089: * NB. we must save copies of the flags that we override for
1.531 djm 2090: * the backgrounding, since we defer attachment of the client until
1.344 djm 2091: * after the connection is fully established (in particular,
2092: * async rfwd replies have been received for ExitOnForwardFailure).
2093: */
1.473 djm 2094: if (options.control_persist && muxserver_sock != -1) {
1.344 djm 2095: ostdin_null_flag = stdin_null_flag;
2096: ono_shell_flag = no_shell_flag;
1.359 djm 2097: orequest_tty = options.request_tty;
1.344 djm 2098: otty_flag = tty_flag;
1.473 djm 2099: stdin_null_flag = 1;
2100: no_shell_flag = 1;
2101: tty_flag = 0;
1.344 djm 2102: if (!fork_after_authentication_flag)
2103: need_controlpersist_detach = 1;
2104: fork_after_authentication_flag = 1;
1.473 djm 2105: }
1.368 djm 2106: /*
2107: * ControlPersist mux listen socket setup failed, attempt the
2108: * stdio forward setup that we skipped earlier.
2109: */
2110: if (options.control_persist && muxserver_sock == -1)
1.463 djm 2111: ssh_init_stdio_forwarding(ssh);
1.344 djm 2112:
1.471 djm 2113: if (!no_shell_flag)
1.463 djm 2114: id = ssh_session2_open(ssh);
1.379 djm 2115: else {
1.499 djm 2116: ssh_packet_set_interactive(ssh,
1.379 djm 2117: options.control_master == SSHCTL_MASTER_NO,
2118: options.ip_qos_interactive, options.ip_qos_bulk);
2119: }
1.314 djm 2120:
2121: /* If we don't expect to open a new session, then disallow it */
1.319 markus 2122: if (options.control_master == SSHCTL_MASTER_NO &&
2123: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 2124: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 2125: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2126: (r = sshpkt_put_cstring(ssh,
2127: "no-more-sessions@openssh.com")) != 0 ||
2128: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2129: (r = sshpkt_send(ssh)) != 0)
2130: fatal("%s: %s", __func__, ssh_err(r));
1.314 djm 2131: }
1.255 reyk 2132:
2133: /* Execute a local command */
2134: if (options.local_command != NULL &&
2135: options.permit_local_command)
2136: ssh_local_cmd(options.local_command);
1.467 djm 2137:
2138: /*
2139: * stdout is now owned by the session channel; clobber it here
2140: * so future channel closes are propagated to the local fd.
2141: * NB. this can only happen after LocalCommand has completed,
2142: * as it may want to write to stdout.
2143: */
1.469 djm 2144: if (!need_controlpersist_detach) {
1.535 djm 2145: if ((devnull = open(_PATH_DEVNULL, O_WRONLY)) == -1) {
1.469 djm 2146: error("%s: open %s: %s", __func__,
2147: _PATH_DEVNULL, strerror(errno));
1.535 djm 2148: } else {
2149: if (dup2(devnull, STDOUT_FILENO) == -1)
2150: fatal("%s: dup2() stdout failed", __func__);
2151: if (devnull > STDERR_FILENO)
2152: close(devnull);
2153: }
1.469 djm 2154: }
1.301 djm 2155:
1.342 djm 2156: /*
2157: * If requested and we are not interested in replies to remote
2158: * forwarding requests, then let ssh continue in the background.
2159: */
1.344 djm 2160: if (fork_after_authentication_flag) {
2161: if (options.exit_on_forward_failure &&
2162: options.num_remote_forwards > 0) {
2163: debug("deferring postauth fork until remote forward "
2164: "confirmation received");
2165: } else
2166: fork_postauth();
1.318 djm 2167: }
1.31 markus 2168:
1.463 djm 2169: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2170: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2171: }
2172:
1.426 djm 2173: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2174: static void
1.466 djm 2175: load_public_identity_files(struct passwd *pw)
1.104 markus 2176: {
1.466 djm 2177: char *filename, *cp;
1.460 markus 2178: struct sshkey *public;
1.426 djm 2179: int i;
2180: u_int n_ids, n_certs;
1.335 djm 2181: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2182: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2183: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2184: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2185: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2186: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2187: #ifdef ENABLE_PKCS11
1.514 djm 2188: struct sshkey **keys = NULL;
2189: char **comments = NULL;
1.333 markus 2190: int nkeys;
1.335 djm 2191: #endif /* PKCS11 */
1.104 markus 2192:
1.426 djm 2193: n_ids = n_certs = 0;
1.398 tedu 2194: memset(identity_files, 0, sizeof(identity_files));
2195: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2196: memset(identity_file_userprovided, 0,
2197: sizeof(identity_file_userprovided));
1.426 djm 2198: memset(certificate_files, 0, sizeof(certificate_files));
2199: memset(certificates, 0, sizeof(certificates));
1.484 djm 2200: memset(certificate_file_userprovided, 0,
2201: sizeof(certificate_file_userprovided));
1.335 djm 2202:
2203: #ifdef ENABLE_PKCS11
1.333 markus 2204: if (options.pkcs11_provider != NULL &&
1.167 markus 2205: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2206: (pkcs11_init(!options.batch_mode) == 0) &&
2207: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1.514 djm 2208: &keys, &comments)) > 0) {
1.333 markus 2209: for (i = 0; i < nkeys; i++) {
1.335 djm 2210: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2211: sshkey_free(keys[i]);
1.514 djm 2212: free(comments[i]);
1.335 djm 2213: continue;
2214: }
2215: identity_keys[n_ids] = keys[i];
1.514 djm 2216: identity_files[n_ids] = comments[i]; /* transferred */
1.335 djm 2217: n_ids++;
1.167 markus 2218: }
1.378 djm 2219: free(keys);
1.514 djm 2220: free(comments);
1.127 markus 2221: }
1.333 markus 2222: #endif /* ENABLE_PKCS11 */
1.335 djm 2223: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2224: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2225: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2226: free(options.identity_files[i]);
1.426 djm 2227: options.identity_files[i] = NULL;
1.335 djm 2228: continue;
2229: }
1.490 dtucker 2230: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.528 dtucker 2231: filename = default_client_percent_dollar_expand(cp,
1.527 dtucker 2232: pw->pw_dir, host, options.user, pw->pw_name);
1.378 djm 2233: free(cp);
1.483 markus 2234: check_load(sshkey_load_public(filename, &public, NULL),
2235: filename, "pubkey");
1.131 millert 2236: debug("identity file %s type %d", filename,
2237: public ? public->type : -1);
1.378 djm 2238: free(options.identity_files[i]);
1.335 djm 2239: identity_files[n_ids] = filename;
2240: identity_keys[n_ids] = public;
1.484 djm 2241: identity_file_userprovided[n_ids] =
2242: options.identity_file_userprovided[i];
1.335 djm 2243: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2244: continue;
2245:
1.426 djm 2246: /*
2247: * If no certificates have been explicitly listed then try
2248: * to add the default certificate variant too.
2249: */
2250: if (options.num_certificate_files != 0)
2251: continue;
1.335 djm 2252: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2253: check_load(sshkey_load_public(cp, &public, NULL),
2254: filename, "pubkey");
1.335 djm 2255: debug("identity file %s type %d", cp,
2256: public ? public->type : -1);
2257: if (public == NULL) {
1.378 djm 2258: free(cp);
1.335 djm 2259: continue;
2260: }
1.483 markus 2261: if (!sshkey_is_cert(public)) {
1.335 djm 2262: debug("%s: key %s type %s is not a certificate",
1.483 markus 2263: __func__, cp, sshkey_type(public));
2264: sshkey_free(public);
1.378 djm 2265: free(cp);
1.335 djm 2266: continue;
2267: }
1.448 djm 2268: /* NB. leave filename pointing to private key */
2269: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2270: identity_keys[n_ids] = public;
1.484 djm 2271: identity_file_userprovided[n_ids] =
2272: options.identity_file_userprovided[i];
1.335 djm 2273: n_ids++;
2274: }
1.426 djm 2275:
2276: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
2277: fatal("%s: too many certificates", __func__);
2278: for (i = 0; i < options.num_certificate_files; i++) {
2279: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2280: getuid());
1.528 dtucker 2281: filename = default_client_percent_dollar_expand(cp,
1.527 dtucker 2282: pw->pw_dir, host, options.user, pw->pw_name);
1.426 djm 2283: free(cp);
2284:
1.483 markus 2285: check_load(sshkey_load_public(filename, &public, NULL),
2286: filename, "certificate");
1.426 djm 2287: debug("certificate file %s type %d", filename,
2288: public ? public->type : -1);
2289: free(options.certificate_files[i]);
2290: options.certificate_files[i] = NULL;
2291: if (public == NULL) {
2292: free(filename);
2293: continue;
2294: }
1.483 markus 2295: if (!sshkey_is_cert(public)) {
1.426 djm 2296: debug("%s: key %s type %s is not a certificate",
1.483 markus 2297: __func__, filename, sshkey_type(public));
2298: sshkey_free(public);
1.426 djm 2299: free(filename);
2300: continue;
2301: }
2302: certificate_files[n_certs] = filename;
2303: certificates[n_certs] = public;
1.484 djm 2304: certificate_file_userprovided[n_certs] =
2305: options.certificate_file_userprovided[i];
1.426 djm 2306: ++n_certs;
2307: }
2308:
1.335 djm 2309: options.num_identity_files = n_ids;
2310: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2311: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2312: memcpy(options.identity_file_userprovided,
2313: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2314:
2315: options.num_certificate_files = n_certs;
2316: memcpy(options.certificate_files,
2317: certificate_files, sizeof(certificate_files));
2318: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2319: memcpy(options.certificate_file_userprovided,
2320: certificate_file_userprovided,
2321: sizeof(certificate_file_userprovided));
1.214 djm 2322: }
1.352 djm 2323:
2324: static void
2325: main_sigchld_handler(int sig)
2326: {
2327: int save_errno = errno;
2328: pid_t pid;
2329: int status;
2330:
2331: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2332: (pid == -1 && errno == EINTR))
1.352 djm 2333: ;
2334: errno = save_errno;
2335: }
![[BACK]](/icons/back.gif){kind=icon}
Return to ssh.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh