Annotation of src/usr.bin/ssh/ssh.c, Revision 1.512
1.512 ! dtucker 1: /* $OpenBSD: ssh.c,v 1.511 2020/01/05 16:28:22 beck 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: *
19: * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
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"
1.405 djm 79: #include "digest.h"
1.1 deraadt 80: #include "packet.h"
1.482 markus 81: #include "sshbuf.h"
1.123 markus 82: #include "channels.h"
1.483 markus 83: #include "sshkey.h"
1.58 markus 84: #include "authfd.h"
1.49 markus 85: #include "authfile.h"
1.83 markus 86: #include "pathnames.h"
1.214 djm 87: #include "dispatch.h"
1.81 markus 88: #include "clientloop.h"
1.84 markus 89: #include "log.h"
1.406 millert 90: #include "misc.h"
1.84 markus 91: #include "readconf.h"
92: #include "sshconnect.h"
1.95 markus 93: #include "kex.h"
94: #include "mac.h"
1.213 deraadt 95: #include "sshpty.h"
1.212 djm 96: #include "match.h"
1.214 djm 97: #include "msg.h"
1.278 stevesk 98: #include "version.h"
1.412 djm 99: #include "ssherr.h"
1.420 djm 100: #include "myproposal.h"
1.49 markus 101:
1.333 markus 102: #ifdef ENABLE_PKCS11
103: #include "ssh-pkcs11.h"
1.137 jakob 104: #endif
1.498 djm 105:
1.49 markus 106: extern char *__progname;
1.1 deraadt 107:
1.316 djm 108: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 109: int debug_flag = 0;
110:
1.359 djm 111: /* Flag indicating whether a tty should be requested */
1.1 deraadt 112: int tty_flag = 0;
113:
1.45 markus 114: /* don't exec a shell */
115: int no_shell_flag = 0;
116:
1.33 markus 117: /*
118: * Flag indicating that nothing should be read from stdin. This can be set
119: * on the command line.
120: */
1.1 deraadt 121: int stdin_null_flag = 0;
122:
1.33 markus 123: /*
1.344 djm 124: * Flag indicating that the current process should be backgrounded and
125: * a new slave launched in the foreground for ControlPersist.
126: */
127: int need_controlpersist_detach = 0;
128:
129: /* Copies of flags for ControlPersist foreground slave */
1.359 djm 130: int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
1.344 djm 131:
132: /*
1.33 markus 133: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 134: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 135: * background.
136: */
1.1 deraadt 137: int fork_after_authentication_flag = 0;
138:
1.33 markus 139: /*
140: * General data structure for command line options and options configurable
141: * in configuration files. See readconf.h.
142: */
1.1 deraadt 143: Options options;
144:
1.139 markus 145: /* optional user configfile */
146: char *config = NULL;
147:
1.33 markus 148: /*
149: * Name of the host we are connecting to. This is the name given on the
1.503 jmc 150: * command line, or the Hostname specified for the user-supplied name in a
1.33 markus 151: * configuration file.
152: */
1.1 deraadt 153: char *host;
154:
1.510 djm 155: /*
156: * A config can specify a path to forward, overriding SSH_AUTH_SOCK. If this is
157: * not NULL, forward the socket at this path instead.
158: */
159: char *forward_agent_sock_path = NULL;
160:
1.466 djm 161: /* Various strings used to to percent_expand() arguments */
162: static char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
163: static char uidstr[32], *host_arg, *conn_hash_hex;
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 */
1.315 djm 178: static int remote_forward_confirms_received = 0;
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:
1.400 djm 219: /*
220: * Attempt to resolve a host name / port to a set of addresses and
221: * optionally return any CNAMEs encountered along the way.
222: * Returns NULL on failure.
223: * NB. this function must operate with a options having undefined members.
224: */
1.385 djm 225: static struct addrinfo *
1.400 djm 226: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 227: {
228: char strport[NI_MAXSERV];
229: struct addrinfo hints, *res;
1.501 dtucker 230: int gaierr;
231: LogLevel loglevel = SYSLOG_LEVEL_DEBUG1;
1.385 djm 232:
1.400 djm 233: if (port <= 0)
234: port = default_ssh_port();
235:
1.427 djm 236: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 237: memset(&hints, 0, sizeof(hints));
1.400 djm 238: hints.ai_family = options.address_family == -1 ?
239: AF_UNSPEC : options.address_family;
1.385 djm 240: hints.ai_socktype = SOCK_STREAM;
241: if (cname != NULL)
242: hints.ai_flags = AI_CANONNAME;
243: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
244: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
245: loglevel = SYSLOG_LEVEL_ERROR;
246: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
247: __progname, name, ssh_gai_strerror(gaierr));
248: return NULL;
249: }
250: if (cname != NULL && res->ai_canonname != NULL) {
251: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
252: error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
253: __func__, name, res->ai_canonname, (u_long)clen);
254: if (clen > 0)
255: *cname = '\0';
256: }
257: }
258: return res;
259: }
260:
1.470 djm 261: /* Returns non-zero if name can only be an address and not a hostname */
262: static int
263: is_addr_fast(const char *name)
264: {
265: return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
266: strspn(name, "0123456789.") == strlen(name));
267: }
268:
269: /* Returns non-zero if name represents a valid, single address */
270: static int
271: is_addr(const char *name)
272: {
273: char strport[NI_MAXSERV];
274: struct addrinfo hints, *res;
275:
276: if (is_addr_fast(name))
277: return 1;
278:
279: snprintf(strport, sizeof strport, "%u", default_ssh_port());
280: memset(&hints, 0, sizeof(hints));
281: hints.ai_family = options.address_family == -1 ?
282: AF_UNSPEC : options.address_family;
283: hints.ai_socktype = SOCK_STREAM;
284: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
285: if (getaddrinfo(name, strport, &hints, &res) != 0)
286: return 0;
287: if (res == NULL || res->ai_next != NULL) {
288: freeaddrinfo(res);
289: return 0;
290: }
291: freeaddrinfo(res);
292: return 1;
293: }
294:
1.385 djm 295: /*
1.413 djm 296: * Attempt to resolve a numeric host address / port to a single address.
297: * Returns a canonical address string.
298: * Returns NULL on failure.
299: * NB. this function must operate with a options having undefined members.
300: */
301: static struct addrinfo *
302: resolve_addr(const char *name, int port, char *caddr, size_t clen)
303: {
304: char addr[NI_MAXHOST], strport[NI_MAXSERV];
305: struct addrinfo hints, *res;
306: int gaierr;
307:
308: if (port <= 0)
309: port = default_ssh_port();
310: snprintf(strport, sizeof strport, "%u", port);
311: memset(&hints, 0, sizeof(hints));
312: hints.ai_family = options.address_family == -1 ?
313: AF_UNSPEC : options.address_family;
314: hints.ai_socktype = SOCK_STREAM;
315: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
316: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
317: debug2("%s: could not resolve name %.100s as address: %s",
318: __func__, name, ssh_gai_strerror(gaierr));
319: return NULL;
320: }
321: if (res == NULL) {
322: debug("%s: getaddrinfo %.100s returned no addresses",
323: __func__, name);
324: return NULL;
325: }
326: if (res->ai_next != NULL) {
327: debug("%s: getaddrinfo %.100s returned multiple addresses",
328: __func__, name);
329: goto fail;
330: }
331: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
332: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
333: debug("%s: Could not format address for name %.100s: %s",
334: __func__, name, ssh_gai_strerror(gaierr));
335: goto fail;
336: }
337: if (strlcpy(caddr, addr, clen) >= clen) {
338: error("%s: host \"%s\" addr \"%s\" too long (max %lu)",
339: __func__, name, addr, (u_long)clen);
340: if (clen > 0)
341: *caddr = '\0';
342: fail:
343: freeaddrinfo(res);
344: return NULL;
345: }
346: return res;
347: }
348:
349: /*
1.385 djm 350: * Check whether the cname is a permitted replacement for the hostname
351: * and perform the replacement if it is.
1.400 djm 352: * NB. this function must operate with a options having undefined members.
1.385 djm 353: */
354: static int
1.443 djm 355: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 356: {
357: int i;
358: struct allowed_cname *rule;
359:
360: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
361: strcmp(*namep, cname) == 0)
362: return 0;
1.386 djm 363: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 364: return 0;
365: /*
1.386 djm 366: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 367: * a proxy or jump host unless the user specifically requests so.
1.385 djm 368: */
1.443 djm 369: if (!direct &&
1.386 djm 370: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 371: return 0;
372: debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
373: for (i = 0; i < options.num_permitted_cnames; i++) {
374: rule = options.permitted_cnames + i;
1.418 djm 375: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
376: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 377: continue;
1.386 djm 378: verbose("Canonicalized DNS aliased hostname "
1.385 djm 379: "\"%s\" => \"%s\"", *namep, cname);
380: free(*namep);
381: *namep = xstrdup(cname);
382: return 1;
383: }
384: return 0;
385: }
386:
387: /*
388: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 389: * canonicalization rules. Returns the address list for the host or NULL
390: * if no name was found after canonicalization.
1.400 djm 391: * NB. this function must operate with a options having undefined members.
1.385 djm 392: */
393: static struct addrinfo *
1.400 djm 394: resolve_canonicalize(char **hostp, int port)
1.385 djm 395: {
1.443 djm 396: int i, direct, ndots;
1.413 djm 397: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 398: struct addrinfo *addrs;
399:
400: /*
1.470 djm 401: * Attempt to canonicalise addresses, regardless of
402: * whether hostname canonicalisation was requested
1.385 djm 403: */
1.413 djm 404: if ((addrs = resolve_addr(*hostp, port,
405: newname, sizeof(newname))) != NULL) {
406: debug2("%s: hostname %.100s is address", __func__, *hostp);
407: if (strcasecmp(*hostp, newname) != 0) {
408: debug2("%s: canonicalised address \"%s\" => \"%s\"",
409: __func__, *hostp, newname);
410: free(*hostp);
411: *hostp = xstrdup(newname);
412: }
413: return addrs;
414: }
415:
1.470 djm 416: /*
417: * If this looks like an address but didn't parse as one, it might
418: * be an address with an invalid interface scope. Skip further
419: * attempts at canonicalisation.
420: */
421: if (is_addr_fast(*hostp)) {
422: debug("%s: hostname %.100s is an unrecognised address",
423: __func__, *hostp);
424: return NULL;
425: }
426:
427: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
428: return NULL;
429:
430: /*
431: * Don't attempt to canonicalize names that will be interpreted by
432: * a proxy unless the user specifically requests so.
433: */
434: direct = option_clear_or_none(options.proxy_command) &&
435: options.jump_host == NULL;
436: if (!direct &&
437: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
438: return NULL;
439:
1.428 djm 440: /* If domain name is anchored, then resolve it now */
441: if ((*hostp)[strlen(*hostp) - 1] == '.') {
442: debug3("%s: name is fully qualified", __func__);
443: fullhost = xstrdup(*hostp);
444: if ((addrs = resolve_host(fullhost, port, 0,
445: newname, sizeof(newname))) != NULL)
446: goto found;
447: free(fullhost);
448: goto notfound;
449: }
450:
1.387 djm 451: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 452: ndots = 0;
453: for (cp = *hostp; *cp != '\0'; cp++) {
454: if (*cp == '.')
455: ndots++;
456: }
1.386 djm 457: if (ndots > options.canonicalize_max_dots) {
458: debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
459: __func__, *hostp, options.canonicalize_max_dots);
1.385 djm 460: return NULL;
461: }
462: /* Attempt each supplied suffix */
463: for (i = 0; i < options.num_canonical_domains; i++) {
1.413 djm 464: *newname = '\0';
1.385 djm 465: xasprintf(&fullhost, "%s.%s.", *hostp,
466: options.canonical_domains[i]);
1.400 djm 467: debug3("%s: attempting \"%s\" => \"%s\"", __func__,
468: *hostp, fullhost);
469: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 470: newname, sizeof(newname))) == NULL) {
1.385 djm 471: free(fullhost);
472: continue;
473: }
1.428 djm 474: found:
1.385 djm 475: /* Remove trailing '.' */
476: fullhost[strlen(fullhost) - 1] = '\0';
477: /* Follow CNAME if requested */
1.443 djm 478: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 479: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 480: *hostp, fullhost);
481: }
482: free(*hostp);
483: *hostp = fullhost;
484: return addrs;
485: }
1.428 djm 486: notfound:
1.386 djm 487: if (!options.canonicalize_fallback_local)
1.400 djm 488: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
489: debug2("%s: host %s not found in any suffix", __func__, *hostp);
1.385 djm 490: return NULL;
491: }
492:
1.32 deraadt 493: /*
1.483 markus 494: * Check the result of hostkey loading, ignoring some errors and
495: * fatal()ing for others.
496: */
497: static void
498: check_load(int r, const char *path, const char *message)
499: {
500: switch (r) {
501: case 0:
502: break;
503: case SSH_ERR_INTERNAL_ERROR:
504: case SSH_ERR_ALLOC_FAIL:
505: fatal("load %s \"%s\": %s", message, path, ssh_err(r));
506: case SSH_ERR_SYSTEM_ERROR:
507: /* Ignore missing files */
508: if (errno == ENOENT)
509: break;
510: /* FALLTHROUGH */
511: default:
512: error("load %s \"%s\": %s", message, path, ssh_err(r));
513: break;
514: }
515: }
516:
517: /*
1.400 djm 518: * Read per-user configuration file. Ignore the system wide config
519: * file if the user specifies a config file on the command line.
520: */
521: static void
1.496 djm 522: process_config_files(const char *host_name, struct passwd *pw, int final_pass,
523: int *want_final_pass)
1.400 djm 524: {
1.414 deraadt 525: char buf[PATH_MAX];
1.400 djm 526: int r;
527:
528: if (config != NULL) {
529: if (strcasecmp(config, "none") != 0 &&
1.466 djm 530: !read_config_file(config, pw, host, host_name, &options,
1.496 djm 531: SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0),
532: want_final_pass))
1.400 djm 533: fatal("Can't open user config file %.100s: "
534: "%.100s", config, strerror(errno));
535: } else {
536: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
537: _PATH_SSH_USER_CONFFILE);
538: if (r > 0 && (size_t)r < sizeof(buf))
1.466 djm 539: (void)read_config_file(buf, pw, host, host_name,
1.408 djm 540: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
1.496 djm 541: (final_pass ? SSHCONF_FINAL : 0), want_final_pass);
1.400 djm 542:
543: /* Read systemwide configuration file after user config. */
1.408 djm 544: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
1.466 djm 545: host, host_name, &options,
1.496 djm 546: final_pass ? SSHCONF_FINAL : 0, want_final_pass);
1.408 djm 547: }
548: }
549:
550: /* Rewrite the port number in an addrinfo list of addresses */
551: static void
552: set_addrinfo_port(struct addrinfo *addrs, int port)
553: {
554: struct addrinfo *addr;
555:
556: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
557: switch (addr->ai_family) {
558: case AF_INET:
559: ((struct sockaddr_in *)addr->ai_addr)->
560: sin_port = htons(port);
561: break;
562: case AF_INET6:
563: ((struct sockaddr_in6 *)addr->ai_addr)->
564: sin6_port = htons(port);
565: break;
566: }
1.400 djm 567: }
568: }
569:
570: /*
1.32 deraadt 571: * Main program for the ssh client.
572: */
1.2 provos 573: int
574: main(int ac, char **av)
1.1 deraadt 575: {
1.437 djm 576: struct ssh *ssh = NULL;
1.462 djm 577: int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
1.496 djm 578: int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
1.466 djm 579: char *p, *cp, *line, *argv0, buf[PATH_MAX], *logfile;
580: char cname[NI_MAXHOST];
1.31 markus 581: struct stat st;
1.98 markus 582: struct passwd *pw;
1.144 stevesk 583: extern int optind, optreset;
584: extern char *optarg;
1.406 millert 585: struct Forward fwd;
1.385 djm 586: struct addrinfo *addrs = NULL;
1.405 djm 587: struct ssh_digest_ctx *md;
588: u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
1.250 djm 589:
590: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
591: sanitise_stdfd();
1.31 markus 592:
1.33 markus 593: /*
1.346 djm 594: * Discard other fds that are hanging around. These can cause problem
595: * with backgrounded ssh processes started by ControlPersist.
596: */
597: closefrom(STDERR_FILENO + 1);
598:
1.487 dtucker 599: if (getuid() != geteuid())
600: fatal("ssh setuid not supported.");
601: if (getgid() != getegid())
602: fatal("ssh setgid not supported.");
1.184 stevesk 603:
1.107 markus 604: /* Get user data. */
1.490 dtucker 605: pw = getpwuid(getuid());
1.107 markus 606: if (!pw) {
1.490 dtucker 607: logit("No user exists for uid %lu", (u_long)getuid());
1.257 dtucker 608: exit(255);
1.107 markus 609: }
610: /* Take a copy of the returned structure. */
611: pw = pwcopy(pw);
1.31 markus 612:
1.33 markus 613: /*
614: * Set our umask to something reasonable, as some files are created
615: * with the default umask. This will make them world-readable but
616: * writable only by the owner, which is ok for all files for which we
617: * don't set the modes explicitly.
618: */
1.31 markus 619: umask(022);
1.445 djm 620:
621: setlocale(LC_CTYPE, "");
1.31 markus 622:
1.316 djm 623: /*
624: * Initialize option structure to indicate that no values have been
625: * set.
626: */
1.31 markus 627: initialize_options(&options);
628:
1.463 djm 629: /*
630: * Prepare main ssh transport/connection structures
631: */
632: if ((ssh = ssh_alloc_session_state()) == NULL)
633: fatal("Couldn't allocate session state");
634: channel_init_channels(ssh);
635:
1.31 markus 636: /* Parse command-line arguments. */
637: host = NULL;
1.320 djm 638: use_syslog = 0;
1.375 dtucker 639: logfile = NULL;
1.325 markus 640: argv0 = av[0];
1.31 markus 641:
1.266 djm 642: again:
1.316 djm 643: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.474 djm 644: "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 645: switch (opt) {
1.91 jakob 646: case '1':
1.454 djm 647: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 648: break;
1.47 markus 649: case '2':
1.454 djm 650: /* Ignored */
1.47 markus 651: break;
1.37 markus 652: case '4':
1.196 djm 653: options.address_family = AF_INET;
1.37 markus 654: break;
655: case '6':
1.196 djm 656: options.address_family = AF_INET6;
1.37 markus 657: break;
1.31 markus 658: case 'n':
659: stdin_null_flag = 1;
660: break;
661: case 'f':
662: fork_after_authentication_flag = 1;
663: stdin_null_flag = 1;
664: break;
665: case 'x':
666: options.forward_x11 = 0;
667: break;
668: case 'X':
669: options.forward_x11 = 1;
670: break;
1.320 djm 671: case 'y':
672: use_syslog = 1;
673: break;
1.375 dtucker 674: case 'E':
1.422 dtucker 675: logfile = optarg;
1.375 dtucker 676: break;
1.408 djm 677: case 'G':
678: config_test = 1;
679: break;
1.202 markus 680: case 'Y':
681: options.forward_x11 = 1;
682: options.forward_x11_trusted = 1;
683: break;
1.31 markus 684: case 'g':
1.406 millert 685: options.fwd_opts.gateway_ports = 1;
1.31 markus 686: break;
1.229 djm 687: case 'O':
1.441 dtucker 688: if (options.stdio_forward_host != NULL)
1.332 djm 689: fatal("Cannot specify multiplexing "
690: "command with -W");
691: else if (muxclient_command != 0)
692: fatal("Multiplexing command already specified");
1.229 djm 693: if (strcmp(optarg, "check") == 0)
1.312 djm 694: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 695: else if (strcmp(optarg, "forward") == 0)
696: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 697: else if (strcmp(optarg, "exit") == 0)
1.312 djm 698: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 699: else if (strcmp(optarg, "stop") == 0)
700: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 701: else if (strcmp(optarg, "cancel") == 0)
702: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 703: else if (strcmp(optarg, "proxy") == 0)
704: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 705: else
706: fatal("Invalid multiplex command.");
707: break;
1.183 stevesk 708: case 'P': /* deprecated */
1.376 djm 709: break;
1.394 deraadt 710: case 'Q':
1.376 djm 711: cp = NULL;
1.394 deraadt 712: if (strcmp(optarg, "cipher") == 0)
1.393 djm 713: cp = cipher_alg_list('\n', 0);
1.394 deraadt 714: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 715: cp = cipher_alg_list('\n', 1);
1.394 deraadt 716: else if (strcmp(optarg, "mac") == 0)
1.392 dtucker 717: cp = mac_alg_list('\n');
1.394 deraadt 718: else if (strcmp(optarg, "kex") == 0)
1.392 dtucker 719: cp = kex_alg_list('\n');
1.394 deraadt 720: else if (strcmp(optarg, "key") == 0)
1.451 djm 721: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 722: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 723: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 724: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 725: cp = sshkey_alg_list(0, 1, 0, '\n');
1.491 djm 726: else if (strcmp(optarg, "sig") == 0)
1.492 djm 727: cp = sshkey_alg_list(0, 1, 1, '\n');
1.491 djm 728: else if (strcmp(optarg, "protocol-version") == 0)
1.416 djm 729: cp = xstrdup("2");
1.491 djm 730: else if (strcmp(optarg, "help") == 0) {
731: cp = xstrdup(
732: "cipher\ncipher-auth\nkex\nkey\n"
733: "key-cert\nkey-plain\nmac\n"
734: "protocol-version\nsig");
1.416 djm 735: }
1.376 djm 736: if (cp == NULL)
737: fatal("Unsupported query \"%s\"", optarg);
738: printf("%s\n", cp);
739: free(cp);
740: exit(0);
1.31 markus 741: break;
742: case 'a':
743: options.forward_agent = 0;
1.53 markus 744: break;
745: case 'A':
746: options.forward_agent = 1;
1.31 markus 747: break;
748: case 'k':
1.204 dtucker 749: options.gss_deleg_creds = 0;
1.297 djm 750: break;
751: case 'K':
752: options.gss_authentication = 1;
753: options.gss_deleg_creds = 1;
1.31 markus 754: break;
755: case 'i':
1.490 dtucker 756: p = tilde_expand_filename(optarg, getuid());
1.505 deraadt 757: if (stat(p, &st) == -1)
1.128 fgsch 758: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 759: "not accessible: %s.\n", p,
1.231 otto 760: strerror(errno));
1.429 dtucker 761: else
762: add_identity_file(&options, NULL, p, 1);
763: free(p);
1.31 markus 764: break;
1.127 markus 765: case 'I':
1.333 markus 766: #ifdef ENABLE_PKCS11
1.422 dtucker 767: free(options.pkcs11_provider);
1.333 markus 768: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 769: #else
1.333 markus 770: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 771: #endif
1.127 markus 772: break;
1.443 djm 773: case 'J':
1.504 djm 774: if (options.jump_host != NULL) {
775: fatal("Only a single -J option is permitted "
776: "(use commas to separate multiple "
777: "jump hops)");
778: }
1.443 djm 779: if (options.proxy_command != NULL)
780: fatal("Cannot specify -J with ProxyCommand");
781: if (parse_jump(optarg, &options, 1) == -1)
782: fatal("Invalid -J argument");
783: options.proxy_command = xstrdup("none");
784: break;
1.31 markus 785: case 't':
1.359 djm 786: if (options.request_tty == REQUEST_TTY_YES)
787: options.request_tty = REQUEST_TTY_FORCE;
788: else
789: options.request_tty = REQUEST_TTY_YES;
1.31 markus 790: break;
791: case 'v':
1.197 markus 792: if (debug_flag == 0) {
1.66 markus 793: debug_flag = 1;
794: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 795: } else {
1.443 djm 796: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
797: debug_flag++;
1.197 markus 798: options.log_level++;
1.443 djm 799: }
1.197 markus 800: }
1.375 dtucker 801: break;
1.31 markus 802: case 'V':
1.209 markus 803: fprintf(stderr, "%s, %s\n",
1.402 markus 804: SSH_VERSION,
805: #ifdef WITH_OPENSSL
1.495 djm 806: OpenSSL_version(OPENSSL_VERSION)
1.402 markus 807: #else
808: "without OpenSSL"
809: #endif
810: );
1.31 markus 811: if (opt == 'V')
812: exit(0);
813: break;
1.255 reyk 814: case 'w':
1.256 reyk 815: if (options.tun_open == -1)
816: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 817: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 818: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 819: fprintf(stderr,
820: "Bad tun device '%s'\n", optarg);
1.257 dtucker 821: exit(255);
1.255 reyk 822: }
823: break;
1.331 dtucker 824: case 'W':
1.441 dtucker 825: if (options.stdio_forward_host != NULL)
1.332 djm 826: fatal("stdio forward already specified");
827: if (muxclient_command != 0)
828: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 829: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 830: options.stdio_forward_host = fwd.listen_host;
831: options.stdio_forward_port = fwd.listen_port;
1.378 djm 832: free(fwd.connect_host);
1.331 dtucker 833: } else {
834: fprintf(stderr,
835: "Bad stdio forwarding specification '%s'\n",
836: optarg);
837: exit(255);
838: }
1.359 djm 839: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 840: no_shell_flag = 1;
841: break;
1.31 markus 842: case 'q':
843: options.log_level = SYSLOG_LEVEL_QUIET;
844: break;
845: case 'e':
846: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 847: (u_char) optarg[1] >= 64 &&
848: (u_char) optarg[1] < 128)
1.78 markus 849: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 850: else if (strlen(optarg) == 1)
1.78 markus 851: options.escape_char = (u_char) optarg[0];
1.31 markus 852: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 853: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 854: else {
1.128 fgsch 855: fprintf(stderr, "Bad escape character '%s'.\n",
856: optarg);
1.257 dtucker 857: exit(255);
1.31 markus 858: }
859: break;
860: case 'c':
1.506 naddy 861: if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
1.420 djm 862: optarg + 1 : optarg)) {
863: fprintf(stderr, "Unknown cipher type '%s'\n",
864: optarg);
865: exit(255);
1.95 markus 866: }
1.456 djm 867: free(options.ciphers);
868: options.ciphers = xstrdup(optarg);
1.95 markus 869: break;
870: case 'm':
1.422 dtucker 871: if (mac_valid(optarg)) {
872: free(options.macs);
1.95 markus 873: options.macs = xstrdup(optarg);
1.422 dtucker 874: } else {
1.128 fgsch 875: fprintf(stderr, "Unknown mac type '%s'\n",
876: optarg);
1.257 dtucker 877: exit(255);
1.31 markus 878: }
879: break;
1.214 djm 880: case 'M':
1.242 djm 881: if (options.control_master == SSHCTL_MASTER_YES)
882: options.control_master = SSHCTL_MASTER_ASK;
883: else
884: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 885: break;
1.31 markus 886: case 'p':
1.465 millert 887: if (options.port == -1) {
888: options.port = a2port(optarg);
889: if (options.port <= 0) {
890: fprintf(stderr, "Bad port '%s'\n",
891: optarg);
892: exit(255);
893: }
1.109 markus 894: }
1.31 markus 895: break;
896: case 'l':
1.465 millert 897: if (options.user == NULL)
898: options.user = optarg;
1.31 markus 899: break;
1.141 stevesk 900:
901: case 'L':
1.324 djm 902: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 903: add_local_forward(&options, &fwd);
904: else {
1.128 fgsch 905: fprintf(stderr,
1.232 djm 906: "Bad local forwarding specification '%s'\n",
1.128 fgsch 907: optarg);
1.257 dtucker 908: exit(255);
1.31 markus 909: }
1.232 djm 910: break;
911:
912: case 'R':
1.464 markus 913: if (parse_forward(&fwd, optarg, 0, 1) ||
914: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 915: add_remote_forward(&options, &fwd);
916: } else {
1.128 fgsch 917: fprintf(stderr,
1.232 djm 918: "Bad remote forwarding specification "
919: "'%s'\n", optarg);
1.257 dtucker 920: exit(255);
1.31 markus 921: }
922: break;
1.108 markus 923:
924: case 'D':
1.324 djm 925: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 926: add_local_forward(&options, &fwd);
1.232 djm 927: } else {
1.322 stevesk 928: fprintf(stderr,
929: "Bad dynamic forwarding specification "
930: "'%s'\n", optarg);
1.257 dtucker 931: exit(255);
1.109 markus 932: }
1.108 markus 933: break;
934:
1.31 markus 935: case 'C':
936: options.compression = 1;
937: break;
1.45 markus 938: case 'N':
939: no_shell_flag = 1;
1.359 djm 940: options.request_tty = REQUEST_TTY_NO;
1.45 markus 941: break;
942: case 'T':
1.359 djm 943: options.request_tty = REQUEST_TTY_NO;
1.45 markus 944: break;
1.31 markus 945: case 'o':
1.205 markus 946: line = xstrdup(optarg);
1.408 djm 947: if (process_config_line(&options, pw,
948: host ? host : "", host ? host : "", line,
949: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 950: exit(255);
1.378 djm 951: free(line);
1.31 markus 952: break;
1.85 djm 953: case 's':
954: subsystem_flag = 1;
1.117 markus 955: break;
1.214 djm 956: case 'S':
1.431 mmcc 957: free(options.control_path);
1.214 djm 958: options.control_path = xstrdup(optarg);
959: break;
1.117 markus 960: case 'b':
961: options.bind_address = optarg;
1.474 djm 962: break;
963: case 'B':
964: options.bind_interface = optarg;
1.85 djm 965: break;
1.139 markus 966: case 'F':
967: config = optarg;
968: break;
1.31 markus 969: default:
970: usage();
1.1 deraadt 971: }
1.31 markus 972: }
973:
1.462 djm 974: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
975: opt_terminated = 1;
976:
1.128 fgsch 977: ac -= optind;
978: av += optind;
979:
1.329 guenther 980: if (ac > 0 && !host) {
1.465 millert 981: int tport;
982: char *tuser;
983: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
984: case -1:
985: usage();
986: break;
987: case 0:
988: if (options.user == NULL) {
989: options.user = tuser;
990: tuser = NULL;
991: }
992: free(tuser);
993: if (options.port == -1 && tport != -1)
994: options.port = tport;
995: break;
996: default:
1.128 fgsch 997: p = xstrdup(*av);
1.188 markus 998: cp = strrchr(p, '@');
1.465 millert 999: if (cp != NULL) {
1000: if (cp == p)
1001: usage();
1002: if (options.user == NULL) {
1003: options.user = p;
1004: p = NULL;
1005: }
1006: *cp++ = '\0';
1007: host = xstrdup(cp);
1008: free(p);
1009: } else
1010: host = p;
1011: break;
1012: }
1.462 djm 1013: if (ac > 1 && !opt_terminated) {
1.189 millert 1014: optind = optreset = 1;
1.128 fgsch 1015: goto again;
1016: }
1.189 millert 1017: ac--, av++;
1.128 fgsch 1018: }
1019:
1.31 markus 1020: /* Check that we got a host name. */
1021: if (!host)
1022: usage();
1023:
1.385 djm 1024: host_arg = xstrdup(host);
1025:
1.402 markus 1026: #ifdef WITH_OPENSSL
1.350 djm 1027: OpenSSL_add_all_algorithms();
1.72 markus 1028: ERR_load_crypto_strings();
1.402 markus 1029: #endif
1.31 markus 1030:
1031: /* Initialize the command to execute on remote host. */
1.482 markus 1032: if ((command = sshbuf_new()) == NULL)
1033: fatal("sshbuf_new failed");
1.1 deraadt 1034:
1.33 markus 1035: /*
1036: * Save the command to execute on the remote host in a buffer. There
1037: * is no limit on the length of the command, except by the maximum
1038: * packet size. Also sets the tty flag if there is no command.
1039: */
1.128 fgsch 1040: if (!ac) {
1.31 markus 1041: /* No command specified - execute shell on a tty. */
1.85 djm 1042: if (subsystem_flag) {
1.128 fgsch 1043: fprintf(stderr,
1044: "You must specify a subsystem to invoke.\n");
1.85 djm 1045: usage();
1046: }
1.31 markus 1047: } else {
1.128 fgsch 1048: /* A command has been specified. Store it into the buffer. */
1049: for (i = 0; i < ac; i++) {
1.482 markus 1050: if ((r = sshbuf_putf(command, "%s%s",
1051: i ? " " : "", av[i])) != 0)
1052: fatal("%s: buffer error: %s",
1053: __func__, ssh_err(r));
1.31 markus 1054: }
1055: }
1056:
1.101 markus 1057: /*
1058: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1059: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1060: */
1.375 dtucker 1061: if (use_syslog && logfile != NULL)
1062: fatal("Can't specify both -y and -E");
1.422 dtucker 1063: if (logfile != NULL)
1.375 dtucker 1064: log_redirect_stderr_to(logfile);
1.325 markus 1065: log_init(argv0,
1.468 djm 1066: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1067: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1068: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1069: SYSLOG_FACILITY_USER : options.log_facility,
1070: !use_syslog);
1.375 dtucker 1071:
1072: if (debug_flag)
1.402 markus 1073: logit("%s, %s", SSH_VERSION,
1074: #ifdef WITH_OPENSSL
1.495 djm 1075: OpenSSL_version(OPENSSL_VERSION)
1.402 markus 1076: #else
1077: "without OpenSSL"
1078: #endif
1079: );
1.31 markus 1080:
1.400 djm 1081: /* Parse the configuration files */
1.496 djm 1082: process_config_files(host_arg, pw, 0, &want_final_pass);
1083: if (want_final_pass)
1084: debug("configuration requests final Match pass");
1.400 djm 1085:
1086: /* Hostname canonicalisation needs a few options filled. */
1087: fill_default_options_for_canonicalization(&options);
1088:
1089: /* If the user has replaced the hostname then take it into use now */
1090: if (options.hostname != NULL) {
1091: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1092: cp = percent_expand(options.hostname,
1093: "h", host, (char *)NULL);
1094: free(host);
1095: host = cp;
1.408 djm 1096: free(options.hostname);
1097: options.hostname = xstrdup(host);
1.400 djm 1098: }
1099:
1.470 djm 1100: /* Don't lowercase addresses, they will be explicitly canonicalised */
1101: if ((was_addr = is_addr(host)) == 0)
1102: lowercase(host);
1103:
1104: /*
1105: * Try to canonicalize if requested by configuration or the
1106: * hostname is an address.
1107: */
1108: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1109: addrs = resolve_canonicalize(&host, options.port);
1110:
1.139 markus 1111: /*
1.401 djm 1112: * If CanonicalizePermittedCNAMEs have been specified but
1113: * other canonicalization did not happen (by not being requested
1114: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1115: * as a result of CNAME following.
1.401 djm 1116: *
1117: * Try to resolve the bare hostname name using the system resolver's
1118: * usual search rules and then apply the CNAME follow rules.
1119: *
1120: * Skip the lookup if a ProxyCommand is being used unless the user
1121: * has specifically requested canonicalisation for this case via
1122: * CanonicalizeHostname=always
1.139 markus 1123: */
1.443 djm 1124: direct = option_clear_or_none(options.proxy_command) &&
1125: options.jump_host == NULL;
1126: if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1127: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1128: if ((addrs = resolve_host(host, options.port,
1.493 djm 1129: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1130: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1131: if (direct)
1.403 djm 1132: cleanup_exit(255); /* logged in resolve_host */
1133: } else
1.443 djm 1134: check_follow_cname(direct, &host, cname);
1.400 djm 1135: }
1.139 markus 1136:
1.400 djm 1137: /*
1.408 djm 1138: * If canonicalisation is enabled then re-parse the configuration
1139: * files as new stanzas may match.
1.400 djm 1140: */
1.496 djm 1141: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1142: debug("hostname canonicalisation enabled, "
1143: "will re-parse configuration");
1144: want_final_pass = 1;
1145: }
1146:
1147: if (want_final_pass) {
1148: debug("re-parsing configuration");
1.408 djm 1149: free(options.hostname);
1150: options.hostname = xstrdup(host);
1.496 djm 1151: process_config_files(host_arg, pw, 1, NULL);
1.408 djm 1152: /*
1153: * Address resolution happens early with canonicalisation
1154: * enabled and the port number may have changed since, so
1155: * reset it in address list
1156: */
1157: if (addrs != NULL && options.port > 0)
1158: set_addrinfo_port(addrs, options.port);
1.139 markus 1159: }
1.31 markus 1160:
1161: /* Fill configuration defaults. */
1162: fill_default_options(&options);
1.443 djm 1163:
1164: /*
1165: * If ProxyJump option specified, then construct a ProxyCommand now.
1166: */
1167: if (options.jump_host != NULL) {
1168: char port_s[8];
1.478 djm 1169: const char *sshbin = argv0;
1170:
1171: /*
1172: * Try to use SSH indicated by argv[0], but fall back to
1173: * "ssh" if it appears unavailable.
1174: */
1175: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1176: sshbin = "ssh";
1.443 djm 1177:
1178: /* Consistency check */
1179: if (options.proxy_command != NULL)
1180: fatal("inconsistent options: ProxyCommand+ProxyJump");
1181: /* Never use FD passing for ProxyJump */
1182: options.proxy_use_fdpass = 0;
1183: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1184: xasprintf(&options.proxy_command,
1.478 djm 1185: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1186: sshbin,
1.443 djm 1187: /* Optional "-l user" argument if jump_user set */
1188: options.jump_user == NULL ? "" : " -l ",
1189: options.jump_user == NULL ? "" : options.jump_user,
1190: /* Optional "-p port" argument if jump_port set */
1191: options.jump_port <= 0 ? "" : " -p ",
1192: options.jump_port <= 0 ? "" : port_s,
1193: /* Optional additional jump hosts ",..." */
1194: options.jump_extra == NULL ? "" : " -J ",
1195: options.jump_extra == NULL ? "" : options.jump_extra,
1196: /* Optional "-F" argumment if -F specified */
1197: config == NULL ? "" : " -F ",
1198: config == NULL ? "" : config,
1199: /* Optional "-v" arguments if -v set */
1200: debug_flag ? " -" : "",
1201: debug_flag, "vvv",
1202: /* Mandatory hostname */
1203: options.jump_host);
1204: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1205: options.proxy_command);
1206: }
1.31 markus 1207:
1.400 djm 1208: if (options.port == 0)
1209: options.port = default_ssh_port();
1.463 djm 1210: channel_set_af(ssh, options.address_family);
1.196 djm 1211:
1.383 djm 1212: /* Tidy and check options */
1213: if (options.host_key_alias != NULL)
1214: lowercase(options.host_key_alias);
1215: if (options.proxy_command != NULL &&
1216: strcmp(options.proxy_command, "-") == 0 &&
1217: options.proxy_use_fdpass)
1218: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.415 djm 1219: if (options.control_persist &&
1220: options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1221: debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1222: "disabling");
1223: options.update_hostkeys = 0;
1224: }
1.430 djm 1225: if (options.connection_attempts <= 0)
1226: fatal("Invalid number of ConnectionAttempts");
1227:
1.482 markus 1228: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1229: fatal("Cannot execute command-line and remote command.");
1230:
1231: /* Cannot fork to background if no command. */
1.482 markus 1232: if (fork_after_authentication_flag && sshbuf_len(command) == 0 &&
1.461 bluhm 1233: options.remote_command == NULL && !no_shell_flag)
1234: fatal("Cannot fork into background without a command "
1235: "to execute.");
1236:
1.31 markus 1237: /* reinit */
1.452 dtucker 1238: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.370 djm 1239:
1240: if (options.request_tty == REQUEST_TTY_YES ||
1241: options.request_tty == REQUEST_TTY_FORCE)
1242: tty_flag = 1;
1243:
1244: /* Allocate a tty by default if no command specified. */
1.482 markus 1245: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1246: tty_flag = options.request_tty != REQUEST_TTY_NO;
1247:
1248: /* Force no tty */
1.447 markus 1249: if (options.request_tty == REQUEST_TTY_NO ||
1250: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
1.370 djm 1251: tty_flag = 0;
1252: /* Do not allocate a tty if stdin is not a tty. */
1253: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1254: options.request_tty != REQUEST_TTY_FORCE) {
1255: if (tty_flag)
1256: logit("Pseudo-terminal will not be allocated because "
1257: "stdin is not a terminal.");
1258: tty_flag = 0;
1259: }
1.31 markus 1260:
1261: if (options.user == NULL)
1262: options.user = xstrdup(pw->pw_name);
1.343 djm 1263:
1.466 djm 1264: /* Set up strings used to percent_expand() arguments */
1.358 djm 1265: if (gethostname(thishost, sizeof(thishost)) == -1)
1266: fatal("gethostname: %s", strerror(errno));
1267: strlcpy(shorthost, thishost, sizeof(shorthost));
1268: shorthost[strcspn(thishost, ".")] = '\0';
1269: snprintf(portstr, sizeof(portstr), "%d", options.port);
1.479 djm 1270: snprintf(uidstr, sizeof(uidstr), "%llu",
1271: (unsigned long long)pw->pw_uid);
1.358 djm 1272:
1.405 djm 1273: if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1274: ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1275: ssh_digest_update(md, host, strlen(host)) < 0 ||
1276: ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1277: ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1278: ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1279: fatal("%s: mux digest failed", __func__);
1280: ssh_digest_free(md);
1281: conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1282:
1.466 djm 1283: /*
1284: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1285: * after port-forwarding is set up, so it may pick up any local
1286: * tunnel interface name allocated.
1287: */
1.461 bluhm 1288: if (options.remote_command != NULL) {
1289: debug3("expanding RemoteCommand: %s", options.remote_command);
1290: cp = options.remote_command;
1291: options.remote_command = percent_expand(cp,
1292: "C", conn_hash_hex,
1293: "L", shorthost,
1294: "d", pw->pw_dir,
1295: "h", host,
1.479 djm 1296: "i", uidstr,
1.461 bluhm 1297: "l", thishost,
1298: "n", host_arg,
1299: "p", portstr,
1300: "r", options.user,
1301: "u", pw->pw_name,
1302: (char *)NULL);
1303: debug3("expanded RemoteCommand: %s", options.remote_command);
1304: free(cp);
1.482 markus 1305: if ((r = sshbuf_put(command, options.remote_command,
1306: strlen(options.remote_command))) != 0)
1307: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.304 dtucker 1308: }
1.31 markus 1309:
1.214 djm 1310: if (options.control_path != NULL) {
1.490 dtucker 1311: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1312: free(options.control_path);
1.405 djm 1313: options.control_path = percent_expand(cp,
1314: "C", conn_hash_hex,
1315: "L", shorthost,
1316: "h", host,
1.479 djm 1317: "i", uidstr,
1.405 djm 1318: "l", thishost,
1319: "n", host_arg,
1320: "p", portstr,
1321: "r", options.user,
1322: "u", pw->pw_name,
1.423 djm 1323: "i", uidstr,
1.358 djm 1324: (char *)NULL);
1.378 djm 1325: free(cp);
1.214 djm 1326: }
1.408 djm 1327:
1328: if (config_test) {
1329: dump_client_config(&options, host);
1330: exit(0);
1.508 djm 1331: }
1332:
1333: /* Expand SecurityKeyProvider if it refers to an environment variable */
1334: if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1335: strlen(options.sk_provider) > 1) {
1336: if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1337: debug("Security key provider %s did not resolve; "
1338: "disabling", options.sk_provider);
1339: free(options.sk_provider);
1340: options.sk_provider = NULL;
1341: } else {
1342: debug2("resolved SecurityKeyProvider %s => %s",
1343: options.sk_provider, cp);
1344: free(options.sk_provider);
1345: options.sk_provider = xstrdup(cp);
1346: }
1.408 djm 1347: }
1.405 djm 1348:
1.312 djm 1349: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1350: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1351: if (options.control_path != NULL) {
1352: int sock;
1353: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1354: ssh_packet_set_connection(ssh, sock, sock);
1.499 djm 1355: ssh_packet_set_mux(ssh);
1.447 markus 1356: goto skip_connect;
1357: }
1358: }
1.401 djm 1359:
1360: /*
1361: * If hostname canonicalisation was not enabled, then we may not
1362: * have yet resolved the hostname. Do so now.
1363: */
1364: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1365: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1366: if ((addrs = resolve_host(host, options.port, 1,
1367: cname, sizeof(cname))) == NULL)
1368: cleanup_exit(255); /* resolve_host logs the error */
1369: }
1.214 djm 1370:
1.303 djm 1371: timeout_ms = options.connection_timeout * 1000;
1372:
1.77 markus 1373: /* Open a connection to the remote host. */
1.511 beck 1374: if (ssh_connect(ssh, host, host_arg, addrs, &hostaddr, options.port,
1.385 djm 1375: options.address_family, options.connection_attempts,
1.488 dtucker 1376: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1377: exit(255);
1.31 markus 1378:
1.391 djm 1379: if (addrs != NULL)
1380: freeaddrinfo(addrs);
1381:
1.499 djm 1382: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1383: options.server_alive_count_max);
1384:
1.303 djm 1385: if (timeout_ms > 0)
1386: debug3("timeout: %d ms remain after connect", timeout_ms);
1387:
1.33 markus 1388: /*
1.485 dtucker 1389: * If we successfully made the connection and we have hostbased auth
1390: * enabled, load the public keys so we can later use the ssh-keysign
1391: * helper to sign challenges.
1.33 markus 1392: */
1.112 markus 1393: sensitive_data.nkeys = 0;
1394: sensitive_data.keys = NULL;
1.457 djm 1395: if (options.hostbased_authentication) {
1.486 dtucker 1396: sensitive_data.nkeys = 10;
1.274 deraadt 1397: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.483 markus 1398: sizeof(struct sshkey));
1399:
1400: /* XXX check errors? */
1.486 dtucker 1401: #define L_PUBKEY(p,o) do { \
1402: if ((o) >= sensitive_data.nkeys) \
1403: fatal("%s pubkey out of array bounds", __func__); \
1.483 markus 1404: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.486 dtucker 1405: p, "pubkey"); \
1406: } while (0)
1407: #define L_CERT(p,o) do { \
1408: if ((o) >= sensitive_data.nkeys) \
1409: fatal("%s cert out of array bounds", __func__); \
1410: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), p, "cert"); \
1411: } while (0)
1.177 markus 1412:
1.485 dtucker 1413: if (options.hostbased_authentication == 1) {
1.486 dtucker 1414: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1415: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1416: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1417: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1418: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1419: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1420: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1421: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1422: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1423: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.173 markus 1424: }
1.31 markus 1425: }
1426:
1.487 dtucker 1427: /* Create ~/.ssh * directory if it doesn't already exist. */
1.367 djm 1428: if (config == NULL) {
1429: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1430: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.505 deraadt 1431: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) == -1)
1432: if (mkdir(buf, 0700) == -1)
1.367 djm 1433: error("Could not create directory '%.200s'.",
1434: buf);
1435: }
1.31 markus 1436:
1.104 markus 1437: /* load options.identity_files */
1.466 djm 1438: load_public_identity_files(pw);
1.439 markus 1439:
1.476 djm 1440: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1441: if (options.identity_agent &&
1442: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1443: if (strcmp(options.identity_agent, "none") == 0) {
1444: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1445: } else {
1446: p = tilde_expand_filename(options.identity_agent,
1.490 dtucker 1447: getuid());
1.479 djm 1448: cp = percent_expand(p,
1449: "d", pw->pw_dir,
1450: "h", host,
1451: "i", uidstr,
1452: "l", thishost,
1453: "r", options.user,
1454: "u", pw->pw_name,
1455: (char *)NULL);
1.494 djm 1456: free(p);
1457: /*
1458: * If identity_agent represents an environment variable
1459: * then recheck that it is valid (since processing with
1460: * percent_expand() may have changed it) and substitute
1461: * its value.
1462: */
1463: if (cp[0] == '$') {
1464: if (!valid_env_name(cp + 1)) {
1465: fatal("Invalid IdentityAgent "
1466: "environment variable name %s", cp);
1467: }
1468: if ((p = getenv(cp + 1)) == NULL)
1469: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1470: else
1471: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1472: } else {
1473: /* identity_agent specifies a path directly */
1474: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1475: }
1.439 markus 1476: free(cp);
1.510 djm 1477: }
1478: }
1479:
1480: if (options.forward_agent && (options.forward_agent_sock_path != NULL)) {
1481: p = tilde_expand_filename(options.forward_agent_sock_path, getuid());
1482: cp = percent_expand(p,
1483: "d", pw->pw_dir,
1484: "h", host,
1485: "i", uidstr,
1486: "l", thishost,
1487: "r", options.user,
1488: "u", pw->pw_name,
1489: (char *)NULL);
1490: free(p);
1491:
1492: if (cp[0] == '$') {
1493: if (!valid_env_name(cp + 1)) {
1494: fatal("Invalid ForwardAgent environment variable name %s", cp);
1495: }
1496: if ((p = getenv(cp + 1)) != NULL)
1497: forward_agent_sock_path = p;
1498: else
1499: options.forward_agent = 0;
1500: free(cp);
1501: } else {
1502: forward_agent_sock_path = cp;
1.439 markus 1503: }
1504: }
1.104 markus 1505:
1506: /* Expand ~ in known host file names. */
1.361 djm 1507: tilde_expand_paths(options.system_hostfiles,
1508: options.num_system_hostfiles);
1509: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1510:
1.512 ! dtucker 1511: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
! 1512: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1513:
1.316 djm 1514: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1515: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1516: options.port, pw, timeout_ms);
1.339 djm 1517:
1.499 djm 1518: if (ssh_packet_connection_is_on_socket(ssh)) {
1.339 djm 1519: verbose("Authenticated to %s ([%s]:%d).", host,
1.437 djm 1520: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
1.339 djm 1521: } else {
1522: verbose("Authenticated to %s (via proxy).", host);
1523: }
1.31 markus 1524:
1.112 markus 1525: /* We no longer need the private host keys. Clear them now. */
1526: if (sensitive_data.nkeys != 0) {
1527: for (i = 0; i < sensitive_data.nkeys; i++) {
1528: if (sensitive_data.keys[i] != NULL) {
1529: /* Destroys contents safely */
1530: debug3("clear hostkey %d", i);
1.483 markus 1531: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1532: sensitive_data.keys[i] = NULL;
1533: }
1534: }
1.378 djm 1535: free(sensitive_data.keys);
1.134 markus 1536: }
1537: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1538: free(options.identity_files[i]);
1539: options.identity_files[i] = NULL;
1.134 markus 1540: if (options.identity_keys[i]) {
1.483 markus 1541: sshkey_free(options.identity_keys[i]);
1.134 markus 1542: options.identity_keys[i] = NULL;
1543: }
1.112 markus 1544: }
1.426 djm 1545: for (i = 0; i < options.num_certificate_files; i++) {
1546: free(options.certificate_files[i]);
1547: options.certificate_files[i] = NULL;
1548: }
1.31 markus 1549:
1.447 markus 1550: skip_connect:
1.466 djm 1551: exit_status = ssh_session2(ssh, pw);
1.499 djm 1552: ssh_packet_close(ssh);
1.186 djm 1553:
1.312 djm 1554: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1555: unlink(options.control_path);
1556:
1.353 djm 1557: /* Kill ProxyCommand if it is running. */
1558: ssh_kill_proxy_command();
1.186 djm 1559:
1.45 markus 1560: return exit_status;
1561: }
1562:
1.344 djm 1563: static void
1564: control_persist_detach(void)
1565: {
1566: pid_t pid;
1.438 djm 1567: int devnull, keep_stderr;
1.344 djm 1568:
1569: debug("%s: backgrounding master process", __func__);
1570:
1.473 djm 1571: /*
1572: * master (current process) into the background, and make the
1573: * foreground process a client of the backgrounded master.
1574: */
1.344 djm 1575: switch ((pid = fork())) {
1576: case -1:
1577: fatal("%s: fork: %s", __func__, strerror(errno));
1578: case 0:
1579: /* Child: master process continues mainloop */
1.473 djm 1580: break;
1581: default:
1.344 djm 1582: /* Parent: set up mux slave to connect to backgrounded master */
1583: debug2("%s: background process is %ld", __func__, (long)pid);
1584: stdin_null_flag = ostdin_null_flag;
1.359 djm 1585: options.request_tty = orequest_tty;
1.344 djm 1586: tty_flag = otty_flag;
1.473 djm 1587: close(muxserver_sock);
1588: muxserver_sock = -1;
1.351 markus 1589: options.control_master = SSHCTL_MASTER_NO;
1.473 djm 1590: muxclient(options.control_path);
1.344 djm 1591: /* muxclient() doesn't return on success. */
1.473 djm 1592: fatal("Failed to connect to new control master");
1593: }
1.346 djm 1594: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1595: error("%s: open(\"/dev/null\"): %s", __func__,
1596: strerror(errno));
1597: } else {
1.438 djm 1598: keep_stderr = log_is_on_stderr() && debug_flag;
1.346 djm 1599: if (dup2(devnull, STDIN_FILENO) == -1 ||
1.438 djm 1600: dup2(devnull, STDOUT_FILENO) == -1 ||
1601: (!keep_stderr && dup2(devnull, STDERR_FILENO) == -1))
1.346 djm 1602: error("%s: dup2: %s", __func__, strerror(errno));
1603: if (devnull > STDERR_FILENO)
1604: close(devnull);
1605: }
1.381 djm 1606: daemon(1, 1);
1.362 djm 1607: setproctitle("%s [mux]", options.control_path);
1.344 djm 1608: }
1609:
1610: /* Do fork() after authentication. Used by "ssh -f" */
1611: static void
1612: fork_postauth(void)
1613: {
1614: if (need_controlpersist_detach)
1615: control_persist_detach();
1616: debug("forking to background");
1617: fork_after_authentication_flag = 0;
1.505 deraadt 1618: if (daemon(1, 1) == -1)
1.344 djm 1619: fatal("daemon() failed: %.200s", strerror(errno));
1620: }
1621:
1.315 djm 1622: /* Callback for remote forward global requests */
1623: static void
1.463 djm 1624: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1625: {
1.406 millert 1626: struct Forward *rfwd = (struct Forward *)ctxt;
1.499 djm 1627: u_int port;
1628: int r;
1.315 djm 1629:
1.324 djm 1630: /* XXX verbose() on failure? */
1.404 markus 1631: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1632: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1633: rfwd->listen_path ? rfwd->listen_path :
1634: rfwd->listen_host ? rfwd->listen_host : "",
1635: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1636: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1637: rfwd->connect_host, rfwd->connect_port);
1638: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1639: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1.499 djm 1640: if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1641: fatal("%s: %s", __func__, ssh_err(r));
1642: if (port > 65535) {
1643: error("Invalid allocated port %u for remote "
1644: "forward to %s:%d", port,
1645: rfwd->connect_host, rfwd->connect_port);
1646: /* Ensure failure processing runs below */
1647: type = SSH2_MSG_REQUEST_FAILURE;
1648: channel_update_permission(ssh,
1649: rfwd->handle, -1);
1650: } else {
1651: rfwd->allocated_port = (int)port;
1652: logit("Allocated port %u for remote "
1653: "forward to %s:%d",
1654: rfwd->allocated_port, rfwd->connect_host,
1655: rfwd->connect_port);
1656: channel_update_permission(ssh,
1657: rfwd->handle, rfwd->allocated_port);
1658: }
1.366 markus 1659: } else {
1.480 djm 1660: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1661: }
1.324 djm 1662: }
1.468 djm 1663:
1.315 djm 1664: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1665: if (options.exit_on_forward_failure) {
1666: if (rfwd->listen_path != NULL)
1667: fatal("Error: remote port forwarding failed "
1668: "for listen path %s", rfwd->listen_path);
1669: else
1670: fatal("Error: remote port forwarding failed "
1671: "for listen port %d", rfwd->listen_port);
1672: } else {
1673: if (rfwd->listen_path != NULL)
1674: logit("Warning: remote port forwarding failed "
1675: "for listen path %s", rfwd->listen_path);
1676: else
1677: logit("Warning: remote port forwarding failed "
1678: "for listen port %d", rfwd->listen_port);
1679: }
1.315 djm 1680: }
1.318 djm 1681: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1682: debug("All remote forwarding requests processed");
1.344 djm 1683: if (fork_after_authentication_flag)
1684: fork_postauth();
1.318 djm 1685: }
1.315 djm 1686: }
1687:
1.126 itojun 1688: static void
1.463 djm 1689: client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
1.331 dtucker 1690: {
1691: debug("stdio forwarding: done");
1692: cleanup_exit(0);
1693: }
1694:
1.368 djm 1695: static void
1.463 djm 1696: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1697: {
1698: if (!success)
1699: fatal("stdio forwarding failed");
1700: }
1701:
1702: static void
1.463 djm 1703: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1704: {
1705: Channel *c;
1.332 djm 1706: int in, out;
1.331 dtucker 1707:
1.441 dtucker 1708: if (options.stdio_forward_host == NULL)
1.368 djm 1709: return;
1710:
1.441 dtucker 1711: debug3("%s: %s:%d", __func__, options.stdio_forward_host,
1712: options.stdio_forward_port);
1.332 djm 1713:
1.505 deraadt 1714: if ((in = dup(STDIN_FILENO)) == -1 ||
1715: (out = dup(STDOUT_FILENO)) == -1)
1.332 djm 1716: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.463 djm 1717: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.441 dtucker 1718: options.stdio_forward_port, in, out)) == NULL)
1.368 djm 1719: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.463 djm 1720: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1721: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1722: }
1723:
1724: static void
1.466 djm 1725: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1726: {
1.86 markus 1727: int success = 0;
1.70 markus 1728: int i;
1.331 dtucker 1729:
1.70 markus 1730: /* Initiate local TCP/IP port forwardings. */
1731: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1732: debug("Local connections to %.200s:%d forwarded to remote "
1733: "address %.200s:%d",
1.406 millert 1734: (options.local_forwards[i].listen_path != NULL) ?
1735: options.local_forwards[i].listen_path :
1.234 deraadt 1736: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1737: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1738: options.local_forwards[i].listen_host,
1739: options.local_forwards[i].listen_port,
1.406 millert 1740: (options.local_forwards[i].connect_path != NULL) ?
1741: options.local_forwards[i].connect_path :
1.232 djm 1742: options.local_forwards[i].connect_host,
1743: options.local_forwards[i].connect_port);
1.463 djm 1744: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1745: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1746: }
1.283 markus 1747: if (i > 0 && success != i && options.exit_on_forward_failure)
1748: fatal("Could not request local forwarding.");
1.86 markus 1749: if (i > 0 && success == 0)
1750: error("Could not request local forwarding.");
1.70 markus 1751:
1752: /* Initiate remote TCP/IP port forwardings. */
1753: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1754: debug("Remote connections from %.200s:%d forwarded to "
1755: "local address %.200s:%d",
1.406 millert 1756: (options.remote_forwards[i].listen_path != NULL) ?
1757: options.remote_forwards[i].listen_path :
1.248 djm 1758: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1759: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1760: options.remote_forwards[i].listen_port,
1.406 millert 1761: (options.remote_forwards[i].connect_path != NULL) ?
1762: options.remote_forwards[i].connect_path :
1.232 djm 1763: options.remote_forwards[i].connect_host,
1764: options.remote_forwards[i].connect_port);
1.366 markus 1765: options.remote_forwards[i].handle =
1.463 djm 1766: channel_request_remote_forwarding(ssh,
1.406 millert 1767: &options.remote_forwards[i]);
1.366 markus 1768: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1769: if (options.exit_on_forward_failure)
1770: fatal("Could not request remote forwarding.");
1771: else
1772: logit("Warning: Could not request remote "
1773: "forwarding.");
1.366 markus 1774: } else {
1.463 djm 1775: client_register_global_confirm(
1776: ssh_confirm_remote_forward,
1.366 markus 1777: &options.remote_forwards[i]);
1.283 markus 1778: }
1.70 markus 1779: }
1.301 djm 1780:
1781: /* Initiate tunnel forwarding. */
1782: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1783: if ((*ifname = client_request_tun_fwd(ssh,
1784: options.tun_open, options.tun_local,
1785: options.tun_remote)) == NULL) {
1.301 djm 1786: if (options.exit_on_forward_failure)
1787: fatal("Could not request tunnel forwarding.");
1788: else
1789: error("Could not request tunnel forwarding.");
1790: }
1.468 djm 1791: }
1.70 markus 1792: }
1793:
1.126 itojun 1794: static void
1.70 markus 1795: check_agent_present(void)
1796: {
1.412 djm 1797: int r;
1798:
1.70 markus 1799: if (options.forward_agent) {
1.254 djm 1800: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1801: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1802: options.forward_agent = 0;
1.412 djm 1803: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1804: debug("ssh_get_authentication_socket: %s",
1805: ssh_err(r));
1806: }
1.70 markus 1807: }
1808: }
1809:
1.214 djm 1810: static void
1.463 djm 1811: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 1812: {
1.215 djm 1813: extern char **environ;
1.243 djm 1814: const char *display;
1.499 djm 1815: int r, interactive = tty_flag;
1.433 djm 1816: char *proto = NULL, *data = NULL;
1.337 djm 1817:
1818: if (!success)
1819: return; /* No need for error message, channels code sens one */
1.215 djm 1820:
1.248 djm 1821: display = getenv("DISPLAY");
1.417 djm 1822: if (display == NULL && options.forward_x11)
1823: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 1824: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 1825: options.xauth_location, options.forward_x11_trusted,
1826: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 1827: /* Request forwarding with authentication spoofing. */
1.316 djm 1828: debug("Requesting X11 forwarding with authentication "
1829: "spoofing.");
1.463 djm 1830: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 1831: data, 1);
1.463 djm 1832: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 1833: /* XXX exit_on_forward_failure */
1.80 markus 1834: interactive = 1;
1.50 markus 1835: }
1836:
1.70 markus 1837: check_agent_present();
1838: if (options.forward_agent) {
1839: debug("Requesting authentication agent forwarding.");
1.463 djm 1840: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 1841: if ((r = sshpkt_send(ssh)) != 0)
1842: fatal("%s: %s", __func__, ssh_err(r));
1.212 djm 1843: }
1.369 dtucker 1844:
1845: /* Tell the packet module whether this is an interactive session. */
1.499 djm 1846: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 1847: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1848:
1.463 djm 1849: client_session2_setup(ssh, id, tty_flag, subsystem_flag, getenv("TERM"),
1.482 markus 1850: NULL, fileno(stdin), command, environ);
1.45 markus 1851: }
1852:
1.143 markus 1853: /* open new channel for a session */
1.126 itojun 1854: static int
1.463 djm 1855: ssh_session2_open(struct ssh *ssh)
1.45 markus 1856: {
1.118 markus 1857: Channel *c;
1858: int window, packetmax, in, out, err;
1.60 markus 1859:
1.62 markus 1860: if (stdin_null_flag) {
1.93 itojun 1861: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1862: } else {
1863: in = dup(STDIN_FILENO);
1864: }
1.60 markus 1865: out = dup(STDOUT_FILENO);
1866: err = dup(STDERR_FILENO);
1.45 markus 1867:
1.505 deraadt 1868: if (in == -1 || out == -1 || err == -1)
1.62 markus 1869: fatal("dup() in/out/err failed");
1.45 markus 1870:
1.69 markus 1871: /* enable nonblocking unless tty */
1872: if (!isatty(in))
1873: set_nonblock(in);
1874: if (!isatty(out))
1875: set_nonblock(out);
1876: if (!isatty(err))
1877: set_nonblock(err);
1878:
1.65 markus 1879: window = CHAN_SES_WINDOW_DEFAULT;
1880: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1881: if (tty_flag) {
1882: window >>= 1;
1883: packetmax >>= 1;
1.45 markus 1884: }
1.463 djm 1885: c = channel_new(ssh,
1.45 markus 1886: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1887: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1888: "client-session", /*nonblock*/0);
1.45 markus 1889:
1.463 djm 1890: debug3("%s: channel_new: %d", __func__, c->self);
1.106 markus 1891:
1.463 djm 1892: channel_send_open(ssh, c->self);
1.143 markus 1893: if (!no_shell_flag)
1.463 djm 1894: channel_register_open_confirm(ssh, c->self,
1.310 djm 1895: ssh_session2_setup, NULL);
1.106 markus 1896:
1.118 markus 1897: return c->self;
1.106 markus 1898: }
1899:
1.126 itojun 1900: static int
1.466 djm 1901: ssh_session2(struct ssh *ssh, struct passwd *pw)
1.106 markus 1902: {
1.499 djm 1903: int r, devnull, id = -1;
1.466 djm 1904: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 1905:
1906: /* XXX should be pre-session */
1.368 djm 1907: if (!options.control_persist)
1.463 djm 1908: ssh_init_stdio_forwarding(ssh);
1.466 djm 1909:
1910: ssh_init_forwarding(ssh, &tun_fwd_ifname);
1911:
1912: if (options.local_command != NULL) {
1913: debug3("expanding LocalCommand: %s", options.local_command);
1914: cp = options.local_command;
1915: options.local_command = percent_expand(cp,
1916: "C", conn_hash_hex,
1917: "L", shorthost,
1918: "d", pw->pw_dir,
1919: "h", host,
1.479 djm 1920: "i", uidstr,
1.466 djm 1921: "l", thishost,
1922: "n", host_arg,
1923: "p", portstr,
1924: "r", options.user,
1925: "u", pw->pw_name,
1926: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
1927: (char *)NULL);
1928: debug3("expanded LocalCommand: %s", options.local_command);
1929: free(cp);
1930: }
1.106 markus 1931:
1.344 djm 1932: /* Start listening for multiplex clients */
1.499 djm 1933: if (!ssh_packet_get_mux(ssh))
1.463 djm 1934: muxserver_listen(ssh);
1.344 djm 1935:
1.473 djm 1936: /*
1.368 djm 1937: * If we are in control persist mode and have a working mux listen
1938: * socket, then prepare to background ourselves and have a foreground
1939: * client attach as a control slave.
1940: * NB. we must save copies of the flags that we override for
1.344 djm 1941: * the backgrounding, since we defer attachment of the slave until
1942: * after the connection is fully established (in particular,
1943: * async rfwd replies have been received for ExitOnForwardFailure).
1944: */
1.473 djm 1945: if (options.control_persist && muxserver_sock != -1) {
1.344 djm 1946: ostdin_null_flag = stdin_null_flag;
1947: ono_shell_flag = no_shell_flag;
1.359 djm 1948: orequest_tty = options.request_tty;
1.344 djm 1949: otty_flag = tty_flag;
1.473 djm 1950: stdin_null_flag = 1;
1951: no_shell_flag = 1;
1952: tty_flag = 0;
1.344 djm 1953: if (!fork_after_authentication_flag)
1954: need_controlpersist_detach = 1;
1955: fork_after_authentication_flag = 1;
1.473 djm 1956: }
1.368 djm 1957: /*
1958: * ControlPersist mux listen socket setup failed, attempt the
1959: * stdio forward setup that we skipped earlier.
1960: */
1961: if (options.control_persist && muxserver_sock == -1)
1.463 djm 1962: ssh_init_stdio_forwarding(ssh);
1.344 djm 1963:
1.471 djm 1964: if (!no_shell_flag)
1.463 djm 1965: id = ssh_session2_open(ssh);
1.379 djm 1966: else {
1.499 djm 1967: ssh_packet_set_interactive(ssh,
1.379 djm 1968: options.control_master == SSHCTL_MASTER_NO,
1969: options.ip_qos_interactive, options.ip_qos_bulk);
1970: }
1.314 djm 1971:
1972: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1973: if (options.control_master == SSHCTL_MASTER_NO &&
1974: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1975: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 1976: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
1977: (r = sshpkt_put_cstring(ssh,
1978: "no-more-sessions@openssh.com")) != 0 ||
1979: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
1980: (r = sshpkt_send(ssh)) != 0)
1981: fatal("%s: %s", __func__, ssh_err(r));
1.314 djm 1982: }
1.255 reyk 1983:
1984: /* Execute a local command */
1985: if (options.local_command != NULL &&
1986: options.permit_local_command)
1987: ssh_local_cmd(options.local_command);
1.467 djm 1988:
1989: /*
1990: * stdout is now owned by the session channel; clobber it here
1991: * so future channel closes are propagated to the local fd.
1992: * NB. this can only happen after LocalCommand has completed,
1993: * as it may want to write to stdout.
1994: */
1.469 djm 1995: if (!need_controlpersist_detach) {
1996: if ((devnull = open(_PATH_DEVNULL, O_WRONLY)) == -1)
1997: error("%s: open %s: %s", __func__,
1998: _PATH_DEVNULL, strerror(errno));
1.505 deraadt 1999: if (dup2(devnull, STDOUT_FILENO) == -1)
1.469 djm 2000: fatal("%s: dup2() stdout failed", __func__);
2001: if (devnull > STDERR_FILENO)
2002: close(devnull);
2003: }
1.301 djm 2004:
1.342 djm 2005: /*
2006: * If requested and we are not interested in replies to remote
2007: * forwarding requests, then let ssh continue in the background.
2008: */
1.344 djm 2009: if (fork_after_authentication_flag) {
2010: if (options.exit_on_forward_failure &&
2011: options.num_remote_forwards > 0) {
2012: debug("deferring postauth fork until remote forward "
2013: "confirmation received");
2014: } else
2015: fork_postauth();
1.318 djm 2016: }
1.31 markus 2017:
1.463 djm 2018: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2019: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2020: }
2021:
1.426 djm 2022: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2023: static void
1.466 djm 2024: load_public_identity_files(struct passwd *pw)
1.104 markus 2025: {
1.466 djm 2026: char *filename, *cp;
1.460 markus 2027: struct sshkey *public;
1.426 djm 2028: int i;
2029: u_int n_ids, n_certs;
1.335 djm 2030: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2031: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2032: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2033: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2034: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2035: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2036: #ifdef ENABLE_PKCS11
1.460 markus 2037: struct sshkey **keys;
1.333 markus 2038: int nkeys;
1.335 djm 2039: #endif /* PKCS11 */
1.104 markus 2040:
1.426 djm 2041: n_ids = n_certs = 0;
1.398 tedu 2042: memset(identity_files, 0, sizeof(identity_files));
2043: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2044: memset(identity_file_userprovided, 0,
2045: sizeof(identity_file_userprovided));
1.426 djm 2046: memset(certificate_files, 0, sizeof(certificate_files));
2047: memset(certificates, 0, sizeof(certificates));
1.484 djm 2048: memset(certificate_file_userprovided, 0,
2049: sizeof(certificate_file_userprovided));
1.335 djm 2050:
2051: #ifdef ENABLE_PKCS11
1.333 markus 2052: if (options.pkcs11_provider != NULL &&
1.167 markus 2053: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2054: (pkcs11_init(!options.batch_mode) == 0) &&
2055: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
2056: &keys)) > 0) {
2057: for (i = 0; i < nkeys; i++) {
1.335 djm 2058: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2059: sshkey_free(keys[i]);
1.335 djm 2060: continue;
2061: }
2062: identity_keys[n_ids] = keys[i];
2063: identity_files[n_ids] =
1.333 markus 2064: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 2065: n_ids++;
1.167 markus 2066: }
1.378 djm 2067: free(keys);
1.127 markus 2068: }
1.333 markus 2069: #endif /* ENABLE_PKCS11 */
1.335 djm 2070: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2071: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2072: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2073: free(options.identity_files[i]);
1.426 djm 2074: options.identity_files[i] = NULL;
1.335 djm 2075: continue;
2076: }
1.490 dtucker 2077: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.466 djm 2078: filename = percent_expand(cp, "d", pw->pw_dir,
2079: "u", pw->pw_name, "l", thishost, "h", host,
1.275 djm 2080: "r", options.user, (char *)NULL);
1.378 djm 2081: free(cp);
1.483 markus 2082: check_load(sshkey_load_public(filename, &public, NULL),
2083: filename, "pubkey");
1.131 millert 2084: debug("identity file %s type %d", filename,
2085: public ? public->type : -1);
1.378 djm 2086: free(options.identity_files[i]);
1.335 djm 2087: identity_files[n_ids] = filename;
2088: identity_keys[n_ids] = public;
1.484 djm 2089: identity_file_userprovided[n_ids] =
2090: options.identity_file_userprovided[i];
1.335 djm 2091: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2092: continue;
2093:
1.426 djm 2094: /*
2095: * If no certificates have been explicitly listed then try
2096: * to add the default certificate variant too.
2097: */
2098: if (options.num_certificate_files != 0)
2099: continue;
1.335 djm 2100: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2101: check_load(sshkey_load_public(cp, &public, NULL),
2102: filename, "pubkey");
1.335 djm 2103: debug("identity file %s type %d", cp,
2104: public ? public->type : -1);
2105: if (public == NULL) {
1.378 djm 2106: free(cp);
1.335 djm 2107: continue;
2108: }
1.483 markus 2109: if (!sshkey_is_cert(public)) {
1.335 djm 2110: debug("%s: key %s type %s is not a certificate",
1.483 markus 2111: __func__, cp, sshkey_type(public));
2112: sshkey_free(public);
1.378 djm 2113: free(cp);
1.335 djm 2114: continue;
2115: }
1.448 djm 2116: /* NB. leave filename pointing to private key */
2117: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2118: identity_keys[n_ids] = public;
1.484 djm 2119: identity_file_userprovided[n_ids] =
2120: options.identity_file_userprovided[i];
1.335 djm 2121: n_ids++;
2122: }
1.426 djm 2123:
2124: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
2125: fatal("%s: too many certificates", __func__);
2126: for (i = 0; i < options.num_certificate_files; i++) {
2127: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2128: getuid());
1.479 djm 2129: filename = percent_expand(cp,
2130: "d", pw->pw_dir,
2131: "h", host,
1.481 djm 2132: "i", uidstr,
1.479 djm 2133: "l", thishost,
2134: "r", options.user,
2135: "u", pw->pw_name,
2136: (char *)NULL);
1.426 djm 2137: free(cp);
2138:
1.483 markus 2139: check_load(sshkey_load_public(filename, &public, NULL),
2140: filename, "certificate");
1.426 djm 2141: debug("certificate file %s type %d", filename,
2142: public ? public->type : -1);
2143: free(options.certificate_files[i]);
2144: options.certificate_files[i] = NULL;
2145: if (public == NULL) {
2146: free(filename);
2147: continue;
2148: }
1.483 markus 2149: if (!sshkey_is_cert(public)) {
1.426 djm 2150: debug("%s: key %s type %s is not a certificate",
1.483 markus 2151: __func__, filename, sshkey_type(public));
2152: sshkey_free(public);
1.426 djm 2153: free(filename);
2154: continue;
2155: }
2156: certificate_files[n_certs] = filename;
2157: certificates[n_certs] = public;
1.484 djm 2158: certificate_file_userprovided[n_certs] =
2159: options.certificate_file_userprovided[i];
1.426 djm 2160: ++n_certs;
2161: }
2162:
1.335 djm 2163: options.num_identity_files = n_ids;
2164: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2165: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2166: memcpy(options.identity_file_userprovided,
2167: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2168:
2169: options.num_certificate_files = n_certs;
2170: memcpy(options.certificate_files,
2171: certificate_files, sizeof(certificate_files));
2172: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2173: memcpy(options.certificate_file_userprovided,
2174: certificate_file_userprovided,
2175: sizeof(certificate_file_userprovided));
1.214 djm 2176: }
1.352 djm 2177:
2178: static void
2179: main_sigchld_handler(int sig)
2180: {
2181: int save_errno = errno;
2182: pid_t pid;
2183: int status;
2184:
2185: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2186: (pid == -1 && errno == EINTR))
1.352 djm 2187: ;
2188: errno = save_errno;
2189: }
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