Annotation of src/usr.bin/ssh/ssh.c, Revision 1.532
1.532 ! dtucker 1: /* $OpenBSD: ssh.c,v 1.531 2020/07/05 23:59:45 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;
163:
1.22 provos 164: /* socket address the host resolves to */
1.37 markus 165: struct sockaddr_storage hostaddr;
1.1 deraadt 166:
1.112 markus 167: /* Private host keys. */
1.173 markus 168: Sensitive sensitive_data;
1.1 deraadt 169:
1.45 markus 170: /* command to be executed */
1.482 markus 171: struct sshbuf *command;
1.45 markus 172:
1.85 djm 173: /* Should we execute a command or invoke a subsystem? */
174: int subsystem_flag = 0;
175:
1.170 markus 176: /* # of replies received for global requests */
1.523 djm 177: static int forward_confirms_pending = -1;
1.170 markus 178:
1.313 djm 179: /* mux.c */
180: extern int muxserver_sock;
181: extern u_int muxclient_command;
182:
1.1 deraadt 183: /* Prints a help message to the user. This function never returns. */
184:
1.126 itojun 185: static void
1.93 itojun 186: usage(void)
1.1 deraadt 187: {
1.208 markus 188: fprintf(stderr,
1.474 djm 189: "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n"
190: " [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n"
191: " [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n"
192: " [-i identity_file] [-J [user@]host[:port]] [-L address]\n"
193: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
194: " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
195: " [-w local_tun[:remote_tun]] destination [command]\n"
1.208 markus 196: );
1.257 dtucker 197: exit(255);
1.1 deraadt 198: }
199:
1.466 djm 200: static int ssh_session2(struct ssh *, struct passwd *);
201: static void load_public_identity_files(struct passwd *);
1.352 djm 202: static void main_sigchld_handler(int);
1.312 djm 203:
1.361 djm 204: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
205: static void
206: tilde_expand_paths(char **paths, u_int num_paths)
207: {
208: u_int i;
209: char *cp;
210:
211: for (i = 0; i < num_paths; i++) {
1.490 dtucker 212: cp = tilde_expand_filename(paths[i], getuid());
1.378 djm 213: free(paths[i]);
1.361 djm 214: paths[i] = cp;
215: }
216: }
217:
1.527 dtucker 218: #define DEFAULT_CLIENT_PERCENT_EXPAND_ARGS \
219: "C", conn_hash_hex, \
220: "L", shorthost, \
221: "i", uidstr, \
222: "l", thishost, \
223: "n", host_arg, \
224: "p", portstr
225:
226: /*
227: * Expands the set of percent_expand options used by the majority of keywords
228: * in the client that support percent expansion.
229: * Caller must free returned string.
230: */
231: static char *
232: default_client_percent_expand(const char *str, const char *homedir,
233: const char *remhost, const char *remuser, const char *locuser)
234: {
235: return percent_expand(str,
236: /* values from statics above */
237: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS,
238: /* values from arguments */
239: "d", homedir,
240: "h", remhost,
241: "r", remuser,
242: "u", locuser,
243: (char *)NULL);
244: }
245:
1.400 djm 246: /*
1.528 dtucker 247: * Expands the set of percent_expand options used by the majority of keywords
248: * AND perform environment variable substitution.
249: * Caller must free returned string.
250: */
251: static char *
252: default_client_percent_dollar_expand(const char *str, const char *homedir,
253: const char *remhost, const char *remuser, const char *locuser)
254: {
255: char *ret;
256:
257: ret = percent_dollar_expand(str,
258: /* values from statics above */
259: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS,
260: /* values from arguments */
261: "d", homedir,
262: "h", remhost,
263: "r", remuser,
264: "u", locuser,
265: (char *)NULL);
266: if (ret == NULL)
267: fatal("invalid environment variable expansion");
268: return ret;
269: }
270:
271: /*
1.400 djm 272: * Attempt to resolve a host name / port to a set of addresses and
273: * optionally return any CNAMEs encountered along the way.
274: * Returns NULL on failure.
275: * NB. this function must operate with a options having undefined members.
276: */
1.385 djm 277: static struct addrinfo *
1.400 djm 278: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 279: {
280: char strport[NI_MAXSERV];
281: struct addrinfo hints, *res;
1.501 dtucker 282: int gaierr;
283: LogLevel loglevel = SYSLOG_LEVEL_DEBUG1;
1.385 djm 284:
1.400 djm 285: if (port <= 0)
286: port = default_ssh_port();
1.521 markus 287: if (cname != NULL)
288: *cname = '\0';
1.400 djm 289:
1.427 djm 290: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 291: memset(&hints, 0, sizeof(hints));
1.400 djm 292: hints.ai_family = options.address_family == -1 ?
293: AF_UNSPEC : options.address_family;
1.385 djm 294: hints.ai_socktype = SOCK_STREAM;
295: if (cname != NULL)
296: hints.ai_flags = AI_CANONNAME;
297: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
298: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
299: loglevel = SYSLOG_LEVEL_ERROR;
300: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
301: __progname, name, ssh_gai_strerror(gaierr));
302: return NULL;
303: }
304: if (cname != NULL && res->ai_canonname != NULL) {
305: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
306: error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
307: __func__, name, res->ai_canonname, (u_long)clen);
308: if (clen > 0)
309: *cname = '\0';
310: }
311: }
312: return res;
313: }
314:
1.470 djm 315: /* Returns non-zero if name can only be an address and not a hostname */
316: static int
317: is_addr_fast(const char *name)
318: {
319: return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
320: strspn(name, "0123456789.") == strlen(name));
321: }
322:
323: /* Returns non-zero if name represents a valid, single address */
324: static int
325: is_addr(const char *name)
326: {
327: char strport[NI_MAXSERV];
328: struct addrinfo hints, *res;
329:
330: if (is_addr_fast(name))
331: return 1;
332:
333: snprintf(strport, sizeof strport, "%u", default_ssh_port());
334: memset(&hints, 0, sizeof(hints));
335: hints.ai_family = options.address_family == -1 ?
336: AF_UNSPEC : options.address_family;
337: hints.ai_socktype = SOCK_STREAM;
338: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
339: if (getaddrinfo(name, strport, &hints, &res) != 0)
340: return 0;
341: if (res == NULL || res->ai_next != NULL) {
342: freeaddrinfo(res);
343: return 0;
344: }
345: freeaddrinfo(res);
346: return 1;
347: }
348:
1.385 djm 349: /*
1.413 djm 350: * Attempt to resolve a numeric host address / port to a single address.
351: * Returns a canonical address string.
352: * Returns NULL on failure.
353: * NB. this function must operate with a options having undefined members.
354: */
355: static struct addrinfo *
356: resolve_addr(const char *name, int port, char *caddr, size_t clen)
357: {
358: char addr[NI_MAXHOST], strport[NI_MAXSERV];
359: struct addrinfo hints, *res;
360: int gaierr;
361:
362: if (port <= 0)
363: port = default_ssh_port();
364: snprintf(strport, sizeof strport, "%u", port);
365: memset(&hints, 0, sizeof(hints));
366: hints.ai_family = options.address_family == -1 ?
367: AF_UNSPEC : options.address_family;
368: hints.ai_socktype = SOCK_STREAM;
369: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
370: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
371: debug2("%s: could not resolve name %.100s as address: %s",
372: __func__, name, ssh_gai_strerror(gaierr));
373: return NULL;
374: }
375: if (res == NULL) {
376: debug("%s: getaddrinfo %.100s returned no addresses",
377: __func__, name);
378: return NULL;
379: }
380: if (res->ai_next != NULL) {
381: debug("%s: getaddrinfo %.100s returned multiple addresses",
382: __func__, name);
383: goto fail;
384: }
385: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
386: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
387: debug("%s: Could not format address for name %.100s: %s",
388: __func__, name, ssh_gai_strerror(gaierr));
389: goto fail;
390: }
391: if (strlcpy(caddr, addr, clen) >= clen) {
392: error("%s: host \"%s\" addr \"%s\" too long (max %lu)",
393: __func__, name, addr, (u_long)clen);
394: if (clen > 0)
395: *caddr = '\0';
396: fail:
397: freeaddrinfo(res);
398: return NULL;
399: }
400: return res;
401: }
402:
403: /*
1.385 djm 404: * Check whether the cname is a permitted replacement for the hostname
405: * and perform the replacement if it is.
1.400 djm 406: * NB. this function must operate with a options having undefined members.
1.385 djm 407: */
408: static int
1.443 djm 409: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 410: {
411: int i;
412: struct allowed_cname *rule;
413:
414: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
415: strcmp(*namep, cname) == 0)
416: return 0;
1.386 djm 417: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 418: return 0;
419: /*
1.386 djm 420: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 421: * a proxy or jump host unless the user specifically requests so.
1.385 djm 422: */
1.443 djm 423: if (!direct &&
1.386 djm 424: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 425: return 0;
426: debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
427: for (i = 0; i < options.num_permitted_cnames; i++) {
428: rule = options.permitted_cnames + i;
1.418 djm 429: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
430: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 431: continue;
1.386 djm 432: verbose("Canonicalized DNS aliased hostname "
1.385 djm 433: "\"%s\" => \"%s\"", *namep, cname);
434: free(*namep);
435: *namep = xstrdup(cname);
436: return 1;
437: }
438: return 0;
439: }
440:
441: /*
442: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 443: * canonicalization rules. Returns the address list for the host or NULL
444: * if no name was found after canonicalization.
1.400 djm 445: * NB. this function must operate with a options having undefined members.
1.385 djm 446: */
447: static struct addrinfo *
1.400 djm 448: resolve_canonicalize(char **hostp, int port)
1.385 djm 449: {
1.443 djm 450: int i, direct, ndots;
1.413 djm 451: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 452: struct addrinfo *addrs;
453:
454: /*
1.470 djm 455: * Attempt to canonicalise addresses, regardless of
456: * whether hostname canonicalisation was requested
1.385 djm 457: */
1.413 djm 458: if ((addrs = resolve_addr(*hostp, port,
459: newname, sizeof(newname))) != NULL) {
460: debug2("%s: hostname %.100s is address", __func__, *hostp);
461: if (strcasecmp(*hostp, newname) != 0) {
462: debug2("%s: canonicalised address \"%s\" => \"%s\"",
463: __func__, *hostp, newname);
464: free(*hostp);
465: *hostp = xstrdup(newname);
466: }
467: return addrs;
468: }
469:
1.470 djm 470: /*
471: * If this looks like an address but didn't parse as one, it might
472: * be an address with an invalid interface scope. Skip further
473: * attempts at canonicalisation.
474: */
475: if (is_addr_fast(*hostp)) {
476: debug("%s: hostname %.100s is an unrecognised address",
477: __func__, *hostp);
478: return NULL;
479: }
480:
481: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
482: return NULL;
483:
484: /*
485: * Don't attempt to canonicalize names that will be interpreted by
486: * a proxy unless the user specifically requests so.
487: */
488: direct = option_clear_or_none(options.proxy_command) &&
489: options.jump_host == NULL;
490: if (!direct &&
491: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
492: return NULL;
493:
1.428 djm 494: /* If domain name is anchored, then resolve it now */
495: if ((*hostp)[strlen(*hostp) - 1] == '.') {
496: debug3("%s: name is fully qualified", __func__);
497: fullhost = xstrdup(*hostp);
498: if ((addrs = resolve_host(fullhost, port, 0,
499: newname, sizeof(newname))) != NULL)
500: goto found;
501: free(fullhost);
502: goto notfound;
503: }
504:
1.387 djm 505: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 506: ndots = 0;
507: for (cp = *hostp; *cp != '\0'; cp++) {
508: if (*cp == '.')
509: ndots++;
510: }
1.386 djm 511: if (ndots > options.canonicalize_max_dots) {
512: debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
513: __func__, *hostp, options.canonicalize_max_dots);
1.385 djm 514: return NULL;
515: }
516: /* Attempt each supplied suffix */
517: for (i = 0; i < options.num_canonical_domains; i++) {
518: xasprintf(&fullhost, "%s.%s.", *hostp,
519: options.canonical_domains[i]);
1.400 djm 520: debug3("%s: attempting \"%s\" => \"%s\"", __func__,
521: *hostp, fullhost);
522: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 523: newname, sizeof(newname))) == NULL) {
1.385 djm 524: free(fullhost);
525: continue;
526: }
1.428 djm 527: found:
1.385 djm 528: /* Remove trailing '.' */
529: fullhost[strlen(fullhost) - 1] = '\0';
530: /* Follow CNAME if requested */
1.443 djm 531: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 532: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 533: *hostp, fullhost);
534: }
535: free(*hostp);
536: *hostp = fullhost;
537: return addrs;
538: }
1.428 djm 539: notfound:
1.386 djm 540: if (!options.canonicalize_fallback_local)
1.400 djm 541: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
542: debug2("%s: host %s not found in any suffix", __func__, *hostp);
1.385 djm 543: return NULL;
544: }
545:
1.32 deraadt 546: /*
1.483 markus 547: * Check the result of hostkey loading, ignoring some errors and
548: * fatal()ing for others.
549: */
550: static void
551: check_load(int r, const char *path, const char *message)
552: {
553: switch (r) {
554: case 0:
555: break;
556: case SSH_ERR_INTERNAL_ERROR:
557: case SSH_ERR_ALLOC_FAIL:
558: fatal("load %s \"%s\": %s", message, path, ssh_err(r));
559: case SSH_ERR_SYSTEM_ERROR:
560: /* Ignore missing files */
561: if (errno == ENOENT)
562: break;
563: /* FALLTHROUGH */
564: default:
565: error("load %s \"%s\": %s", message, path, ssh_err(r));
566: break;
567: }
568: }
569:
570: /*
1.400 djm 571: * Read per-user configuration file. Ignore the system wide config
572: * file if the user specifies a config file on the command line.
573: */
574: static void
1.496 djm 575: process_config_files(const char *host_name, struct passwd *pw, int final_pass,
576: int *want_final_pass)
1.400 djm 577: {
1.414 deraadt 578: char buf[PATH_MAX];
1.400 djm 579: int r;
580:
581: if (config != NULL) {
582: if (strcasecmp(config, "none") != 0 &&
1.466 djm 583: !read_config_file(config, pw, host, host_name, &options,
1.496 djm 584: SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0),
585: want_final_pass))
1.400 djm 586: fatal("Can't open user config file %.100s: "
587: "%.100s", config, strerror(errno));
588: } else {
589: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
590: _PATH_SSH_USER_CONFFILE);
591: if (r > 0 && (size_t)r < sizeof(buf))
1.466 djm 592: (void)read_config_file(buf, pw, host, host_name,
1.408 djm 593: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
1.496 djm 594: (final_pass ? SSHCONF_FINAL : 0), want_final_pass);
1.400 djm 595:
596: /* Read systemwide configuration file after user config. */
1.408 djm 597: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
1.466 djm 598: host, host_name, &options,
1.496 djm 599: final_pass ? SSHCONF_FINAL : 0, want_final_pass);
1.408 djm 600: }
601: }
602:
603: /* Rewrite the port number in an addrinfo list of addresses */
604: static void
605: set_addrinfo_port(struct addrinfo *addrs, int port)
606: {
607: struct addrinfo *addr;
608:
609: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
610: switch (addr->ai_family) {
611: case AF_INET:
612: ((struct sockaddr_in *)addr->ai_addr)->
613: sin_port = htons(port);
614: break;
615: case AF_INET6:
616: ((struct sockaddr_in6 *)addr->ai_addr)->
617: sin6_port = htons(port);
618: break;
619: }
1.400 djm 620: }
621: }
622:
623: /*
1.32 deraadt 624: * Main program for the ssh client.
625: */
1.2 provos 626: int
627: main(int ac, char **av)
1.1 deraadt 628: {
1.437 djm 629: struct ssh *ssh = NULL;
1.462 djm 630: int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
1.496 djm 631: int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
1.530 dtucker 632: char *p, *cp, *line, *argv0, *logfile;
1.466 djm 633: char cname[NI_MAXHOST];
1.31 markus 634: struct stat st;
1.98 markus 635: struct passwd *pw;
1.144 stevesk 636: extern int optind, optreset;
637: extern char *optarg;
1.406 millert 638: struct Forward fwd;
1.385 djm 639: struct addrinfo *addrs = NULL;
1.513 dtucker 640: size_t n, len;
1.532 ! dtucker 641: u_int j;
1.250 djm 642:
643: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
644: sanitise_stdfd();
1.31 markus 645:
1.33 markus 646: /*
1.346 djm 647: * Discard other fds that are hanging around. These can cause problem
648: * with backgrounded ssh processes started by ControlPersist.
649: */
650: closefrom(STDERR_FILENO + 1);
651:
1.487 dtucker 652: if (getuid() != geteuid())
653: fatal("ssh setuid not supported.");
654: if (getgid() != getegid())
655: fatal("ssh setgid not supported.");
1.184 stevesk 656:
1.107 markus 657: /* Get user data. */
1.490 dtucker 658: pw = getpwuid(getuid());
1.107 markus 659: if (!pw) {
1.490 dtucker 660: logit("No user exists for uid %lu", (u_long)getuid());
1.257 dtucker 661: exit(255);
1.107 markus 662: }
663: /* Take a copy of the returned structure. */
664: pw = pwcopy(pw);
1.31 markus 665:
1.33 markus 666: /*
667: * Set our umask to something reasonable, as some files are created
668: * with the default umask. This will make them world-readable but
669: * writable only by the owner, which is ok for all files for which we
670: * don't set the modes explicitly.
671: */
1.31 markus 672: umask(022);
1.445 djm 673:
674: setlocale(LC_CTYPE, "");
1.31 markus 675:
1.316 djm 676: /*
677: * Initialize option structure to indicate that no values have been
678: * set.
679: */
1.31 markus 680: initialize_options(&options);
681:
1.463 djm 682: /*
683: * Prepare main ssh transport/connection structures
684: */
685: if ((ssh = ssh_alloc_session_state()) == NULL)
686: fatal("Couldn't allocate session state");
687: channel_init_channels(ssh);
688:
1.31 markus 689: /* Parse command-line arguments. */
690: host = NULL;
1.320 djm 691: use_syslog = 0;
1.375 dtucker 692: logfile = NULL;
1.325 markus 693: argv0 = av[0];
1.31 markus 694:
1.266 djm 695: again:
1.316 djm 696: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.474 djm 697: "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 698: switch (opt) {
1.91 jakob 699: case '1':
1.454 djm 700: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 701: break;
1.47 markus 702: case '2':
1.454 djm 703: /* Ignored */
1.47 markus 704: break;
1.37 markus 705: case '4':
1.196 djm 706: options.address_family = AF_INET;
1.37 markus 707: break;
708: case '6':
1.196 djm 709: options.address_family = AF_INET6;
1.37 markus 710: break;
1.31 markus 711: case 'n':
712: stdin_null_flag = 1;
713: break;
714: case 'f':
715: fork_after_authentication_flag = 1;
716: stdin_null_flag = 1;
717: break;
718: case 'x':
719: options.forward_x11 = 0;
720: break;
721: case 'X':
722: options.forward_x11 = 1;
723: break;
1.320 djm 724: case 'y':
725: use_syslog = 1;
726: break;
1.375 dtucker 727: case 'E':
1.422 dtucker 728: logfile = optarg;
1.375 dtucker 729: break;
1.408 djm 730: case 'G':
731: config_test = 1;
732: break;
1.202 markus 733: case 'Y':
734: options.forward_x11 = 1;
735: options.forward_x11_trusted = 1;
736: break;
1.31 markus 737: case 'g':
1.406 millert 738: options.fwd_opts.gateway_ports = 1;
1.31 markus 739: break;
1.229 djm 740: case 'O':
1.441 dtucker 741: if (options.stdio_forward_host != NULL)
1.332 djm 742: fatal("Cannot specify multiplexing "
743: "command with -W");
744: else if (muxclient_command != 0)
745: fatal("Multiplexing command already specified");
1.229 djm 746: if (strcmp(optarg, "check") == 0)
1.312 djm 747: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 748: else if (strcmp(optarg, "forward") == 0)
749: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 750: else if (strcmp(optarg, "exit") == 0)
1.312 djm 751: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 752: else if (strcmp(optarg, "stop") == 0)
753: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 754: else if (strcmp(optarg, "cancel") == 0)
755: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 756: else if (strcmp(optarg, "proxy") == 0)
757: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 758: else
759: fatal("Invalid multiplex command.");
760: break;
1.183 stevesk 761: case 'P': /* deprecated */
1.376 djm 762: break;
1.394 deraadt 763: case 'Q':
1.376 djm 764: cp = NULL;
1.519 dtucker 765: if (strcmp(optarg, "cipher") == 0 ||
766: strcasecmp(optarg, "Ciphers") == 0)
1.393 djm 767: cp = cipher_alg_list('\n', 0);
1.394 deraadt 768: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 769: cp = cipher_alg_list('\n', 1);
1.519 dtucker 770: else if (strcmp(optarg, "mac") == 0 ||
771: strcasecmp(optarg, "MACs") == 0)
1.392 dtucker 772: cp = mac_alg_list('\n');
1.519 dtucker 773: else if (strcmp(optarg, "kex") == 0 ||
774: strcasecmp(optarg, "KexAlgorithms") == 0)
1.392 dtucker 775: cp = kex_alg_list('\n');
1.394 deraadt 776: else if (strcmp(optarg, "key") == 0)
1.451 djm 777: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 778: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 779: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 780: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 781: cp = sshkey_alg_list(0, 1, 0, '\n');
1.519 dtucker 782: else if (strcmp(optarg, "key-sig") == 0 ||
783: strcasecmp(optarg, "PubkeyAcceptedKeyTypes") == 0 ||
784: strcasecmp(optarg, "HostKeyAlgorithms") == 0 ||
785: strcasecmp(optarg, "HostbasedKeyTypes") == 0 ||
786: strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 0)
787: cp = sshkey_alg_list(0, 0, 1, '\n');
1.491 djm 788: else if (strcmp(optarg, "sig") == 0)
1.492 djm 789: cp = sshkey_alg_list(0, 1, 1, '\n');
1.491 djm 790: else if (strcmp(optarg, "protocol-version") == 0)
1.416 djm 791: cp = xstrdup("2");
1.513 dtucker 792: else if (strcmp(optarg, "compression") == 0) {
793: cp = xstrdup(compression_alg_list(0));
794: len = strlen(cp);
795: for (n = 0; n < len; n++)
796: if (cp[n] == ',')
797: cp[n] = '\n';
798: } else if (strcmp(optarg, "help") == 0) {
1.491 djm 799: cp = xstrdup(
1.513 dtucker 800: "cipher\ncipher-auth\ncompression\nkex\n"
1.519 dtucker 801: "key\nkey-cert\nkey-plain\nkey-sig\nmac\n"
1.491 djm 802: "protocol-version\nsig");
1.416 djm 803: }
1.376 djm 804: if (cp == NULL)
805: fatal("Unsupported query \"%s\"", optarg);
806: printf("%s\n", cp);
807: free(cp);
808: exit(0);
1.31 markus 809: break;
810: case 'a':
811: options.forward_agent = 0;
1.53 markus 812: break;
813: case 'A':
814: options.forward_agent = 1;
1.31 markus 815: break;
816: case 'k':
1.204 dtucker 817: options.gss_deleg_creds = 0;
1.297 djm 818: break;
819: case 'K':
820: options.gss_authentication = 1;
821: options.gss_deleg_creds = 1;
1.31 markus 822: break;
823: case 'i':
1.490 dtucker 824: p = tilde_expand_filename(optarg, getuid());
1.505 deraadt 825: if (stat(p, &st) == -1)
1.128 fgsch 826: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 827: "not accessible: %s.\n", p,
1.231 otto 828: strerror(errno));
1.429 dtucker 829: else
830: add_identity_file(&options, NULL, p, 1);
831: free(p);
1.31 markus 832: break;
1.127 markus 833: case 'I':
1.333 markus 834: #ifdef ENABLE_PKCS11
1.422 dtucker 835: free(options.pkcs11_provider);
1.333 markus 836: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 837: #else
1.333 markus 838: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 839: #endif
1.127 markus 840: break;
1.443 djm 841: case 'J':
1.504 djm 842: if (options.jump_host != NULL) {
843: fatal("Only a single -J option is permitted "
844: "(use commas to separate multiple "
845: "jump hops)");
846: }
1.443 djm 847: if (options.proxy_command != NULL)
848: fatal("Cannot specify -J with ProxyCommand");
849: if (parse_jump(optarg, &options, 1) == -1)
850: fatal("Invalid -J argument");
851: options.proxy_command = xstrdup("none");
852: break;
1.31 markus 853: case 't':
1.359 djm 854: if (options.request_tty == REQUEST_TTY_YES)
855: options.request_tty = REQUEST_TTY_FORCE;
856: else
857: options.request_tty = REQUEST_TTY_YES;
1.31 markus 858: break;
859: case 'v':
1.197 markus 860: if (debug_flag == 0) {
1.66 markus 861: debug_flag = 1;
862: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 863: } else {
1.443 djm 864: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
865: debug_flag++;
1.197 markus 866: options.log_level++;
1.443 djm 867: }
1.197 markus 868: }
1.375 dtucker 869: break;
1.31 markus 870: case 'V':
1.209 markus 871: fprintf(stderr, "%s, %s\n",
1.402 markus 872: SSH_VERSION,
873: #ifdef WITH_OPENSSL
1.495 djm 874: OpenSSL_version(OPENSSL_VERSION)
1.402 markus 875: #else
876: "without OpenSSL"
877: #endif
878: );
1.31 markus 879: if (opt == 'V')
880: exit(0);
881: break;
1.255 reyk 882: case 'w':
1.256 reyk 883: if (options.tun_open == -1)
884: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 885: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 886: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 887: fprintf(stderr,
888: "Bad tun device '%s'\n", optarg);
1.257 dtucker 889: exit(255);
1.255 reyk 890: }
891: break;
1.331 dtucker 892: case 'W':
1.441 dtucker 893: if (options.stdio_forward_host != NULL)
1.332 djm 894: fatal("stdio forward already specified");
895: if (muxclient_command != 0)
896: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 897: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 898: options.stdio_forward_host = fwd.listen_host;
899: options.stdio_forward_port = fwd.listen_port;
1.378 djm 900: free(fwd.connect_host);
1.331 dtucker 901: } else {
902: fprintf(stderr,
903: "Bad stdio forwarding specification '%s'\n",
904: optarg);
905: exit(255);
906: }
1.359 djm 907: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 908: no_shell_flag = 1;
909: break;
1.31 markus 910: case 'q':
911: options.log_level = SYSLOG_LEVEL_QUIET;
912: break;
913: case 'e':
914: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 915: (u_char) optarg[1] >= 64 &&
916: (u_char) optarg[1] < 128)
1.78 markus 917: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 918: else if (strlen(optarg) == 1)
1.78 markus 919: options.escape_char = (u_char) optarg[0];
1.31 markus 920: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 921: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 922: else {
1.128 fgsch 923: fprintf(stderr, "Bad escape character '%s'.\n",
924: optarg);
1.257 dtucker 925: exit(255);
1.31 markus 926: }
927: break;
928: case 'c':
1.506 naddy 929: if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
1.420 djm 930: optarg + 1 : optarg)) {
931: fprintf(stderr, "Unknown cipher type '%s'\n",
932: optarg);
933: exit(255);
1.95 markus 934: }
1.456 djm 935: free(options.ciphers);
936: options.ciphers = xstrdup(optarg);
1.95 markus 937: break;
938: case 'm':
1.422 dtucker 939: if (mac_valid(optarg)) {
940: free(options.macs);
1.95 markus 941: options.macs = xstrdup(optarg);
1.422 dtucker 942: } else {
1.128 fgsch 943: fprintf(stderr, "Unknown mac type '%s'\n",
944: optarg);
1.257 dtucker 945: exit(255);
1.31 markus 946: }
947: break;
1.214 djm 948: case 'M':
1.242 djm 949: if (options.control_master == SSHCTL_MASTER_YES)
950: options.control_master = SSHCTL_MASTER_ASK;
951: else
952: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 953: break;
1.31 markus 954: case 'p':
1.465 millert 955: if (options.port == -1) {
956: options.port = a2port(optarg);
957: if (options.port <= 0) {
958: fprintf(stderr, "Bad port '%s'\n",
959: optarg);
960: exit(255);
961: }
1.109 markus 962: }
1.31 markus 963: break;
964: case 'l':
1.465 millert 965: if (options.user == NULL)
966: options.user = optarg;
1.31 markus 967: break;
1.141 stevesk 968:
969: case 'L':
1.324 djm 970: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 971: add_local_forward(&options, &fwd);
972: else {
1.128 fgsch 973: fprintf(stderr,
1.232 djm 974: "Bad local forwarding specification '%s'\n",
1.128 fgsch 975: optarg);
1.257 dtucker 976: exit(255);
1.31 markus 977: }
1.232 djm 978: break;
979:
980: case 'R':
1.464 markus 981: if (parse_forward(&fwd, optarg, 0, 1) ||
982: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 983: add_remote_forward(&options, &fwd);
984: } else {
1.128 fgsch 985: fprintf(stderr,
1.232 djm 986: "Bad remote forwarding specification "
987: "'%s'\n", optarg);
1.257 dtucker 988: exit(255);
1.31 markus 989: }
990: break;
1.108 markus 991:
992: case 'D':
1.324 djm 993: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 994: add_local_forward(&options, &fwd);
1.232 djm 995: } else {
1.322 stevesk 996: fprintf(stderr,
997: "Bad dynamic forwarding specification "
998: "'%s'\n", optarg);
1.257 dtucker 999: exit(255);
1.109 markus 1000: }
1.108 markus 1001: break;
1002:
1.31 markus 1003: case 'C':
1.513 dtucker 1004: #ifdef WITH_ZLIB
1.31 markus 1005: options.compression = 1;
1.513 dtucker 1006: #else
1007: error("Compression not supported, disabling.");
1008: #endif
1.31 markus 1009: break;
1.45 markus 1010: case 'N':
1011: no_shell_flag = 1;
1.359 djm 1012: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1013: break;
1014: case 'T':
1.359 djm 1015: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1016: break;
1.31 markus 1017: case 'o':
1.205 markus 1018: line = xstrdup(optarg);
1.408 djm 1019: if (process_config_line(&options, pw,
1020: host ? host : "", host ? host : "", line,
1021: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 1022: exit(255);
1.378 djm 1023: free(line);
1.31 markus 1024: break;
1.85 djm 1025: case 's':
1026: subsystem_flag = 1;
1.117 markus 1027: break;
1.214 djm 1028: case 'S':
1.431 mmcc 1029: free(options.control_path);
1.214 djm 1030: options.control_path = xstrdup(optarg);
1031: break;
1.117 markus 1032: case 'b':
1033: options.bind_address = optarg;
1.474 djm 1034: break;
1035: case 'B':
1036: options.bind_interface = optarg;
1.85 djm 1037: break;
1.139 markus 1038: case 'F':
1039: config = optarg;
1040: break;
1.31 markus 1041: default:
1042: usage();
1.1 deraadt 1043: }
1.31 markus 1044: }
1045:
1.462 djm 1046: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
1047: opt_terminated = 1;
1048:
1.128 fgsch 1049: ac -= optind;
1050: av += optind;
1051:
1.329 guenther 1052: if (ac > 0 && !host) {
1.465 millert 1053: int tport;
1054: char *tuser;
1055: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
1056: case -1:
1057: usage();
1058: break;
1059: case 0:
1060: if (options.user == NULL) {
1061: options.user = tuser;
1062: tuser = NULL;
1063: }
1064: free(tuser);
1065: if (options.port == -1 && tport != -1)
1066: options.port = tport;
1067: break;
1068: default:
1.128 fgsch 1069: p = xstrdup(*av);
1.188 markus 1070: cp = strrchr(p, '@');
1.465 millert 1071: if (cp != NULL) {
1072: if (cp == p)
1073: usage();
1074: if (options.user == NULL) {
1075: options.user = p;
1076: p = NULL;
1077: }
1078: *cp++ = '\0';
1079: host = xstrdup(cp);
1080: free(p);
1081: } else
1082: host = p;
1083: break;
1084: }
1.462 djm 1085: if (ac > 1 && !opt_terminated) {
1.189 millert 1086: optind = optreset = 1;
1.128 fgsch 1087: goto again;
1088: }
1.189 millert 1089: ac--, av++;
1.128 fgsch 1090: }
1091:
1.31 markus 1092: /* Check that we got a host name. */
1093: if (!host)
1094: usage();
1095:
1.385 djm 1096: host_arg = xstrdup(host);
1097:
1.402 markus 1098: #ifdef WITH_OPENSSL
1.350 djm 1099: OpenSSL_add_all_algorithms();
1.72 markus 1100: ERR_load_crypto_strings();
1.402 markus 1101: #endif
1.31 markus 1102:
1103: /* Initialize the command to execute on remote host. */
1.482 markus 1104: if ((command = sshbuf_new()) == NULL)
1105: fatal("sshbuf_new failed");
1.1 deraadt 1106:
1.33 markus 1107: /*
1108: * Save the command to execute on the remote host in a buffer. There
1109: * is no limit on the length of the command, except by the maximum
1110: * packet size. Also sets the tty flag if there is no command.
1111: */
1.128 fgsch 1112: if (!ac) {
1.31 markus 1113: /* No command specified - execute shell on a tty. */
1.85 djm 1114: if (subsystem_flag) {
1.128 fgsch 1115: fprintf(stderr,
1116: "You must specify a subsystem to invoke.\n");
1.85 djm 1117: usage();
1118: }
1.31 markus 1119: } else {
1.128 fgsch 1120: /* A command has been specified. Store it into the buffer. */
1121: for (i = 0; i < ac; i++) {
1.482 markus 1122: if ((r = sshbuf_putf(command, "%s%s",
1123: i ? " " : "", av[i])) != 0)
1124: fatal("%s: buffer error: %s",
1125: __func__, ssh_err(r));
1.31 markus 1126: }
1127: }
1128:
1.101 markus 1129: /*
1130: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1131: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1132: */
1.375 dtucker 1133: if (use_syslog && logfile != NULL)
1134: fatal("Can't specify both -y and -E");
1.422 dtucker 1135: if (logfile != NULL)
1.375 dtucker 1136: log_redirect_stderr_to(logfile);
1.325 markus 1137: log_init(argv0,
1.468 djm 1138: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1139: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1140: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1141: SYSLOG_FACILITY_USER : options.log_facility,
1142: !use_syslog);
1.375 dtucker 1143:
1144: if (debug_flag)
1.402 markus 1145: logit("%s, %s", SSH_VERSION,
1146: #ifdef WITH_OPENSSL
1.495 djm 1147: OpenSSL_version(OPENSSL_VERSION)
1.402 markus 1148: #else
1149: "without OpenSSL"
1150: #endif
1151: );
1.31 markus 1152:
1.400 djm 1153: /* Parse the configuration files */
1.496 djm 1154: process_config_files(host_arg, pw, 0, &want_final_pass);
1155: if (want_final_pass)
1156: debug("configuration requests final Match pass");
1.400 djm 1157:
1158: /* Hostname canonicalisation needs a few options filled. */
1159: fill_default_options_for_canonicalization(&options);
1160:
1161: /* If the user has replaced the hostname then take it into use now */
1162: if (options.hostname != NULL) {
1163: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1164: cp = percent_expand(options.hostname,
1165: "h", host, (char *)NULL);
1166: free(host);
1167: host = cp;
1.408 djm 1168: free(options.hostname);
1169: options.hostname = xstrdup(host);
1.400 djm 1170: }
1171:
1.470 djm 1172: /* Don't lowercase addresses, they will be explicitly canonicalised */
1173: if ((was_addr = is_addr(host)) == 0)
1174: lowercase(host);
1175:
1176: /*
1177: * Try to canonicalize if requested by configuration or the
1178: * hostname is an address.
1179: */
1180: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1181: addrs = resolve_canonicalize(&host, options.port);
1182:
1.139 markus 1183: /*
1.401 djm 1184: * If CanonicalizePermittedCNAMEs have been specified but
1185: * other canonicalization did not happen (by not being requested
1186: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1187: * as a result of CNAME following.
1.401 djm 1188: *
1189: * Try to resolve the bare hostname name using the system resolver's
1190: * usual search rules and then apply the CNAME follow rules.
1191: *
1192: * Skip the lookup if a ProxyCommand is being used unless the user
1193: * has specifically requested canonicalisation for this case via
1194: * CanonicalizeHostname=always
1.139 markus 1195: */
1.443 djm 1196: direct = option_clear_or_none(options.proxy_command) &&
1197: options.jump_host == NULL;
1198: if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1199: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1200: if ((addrs = resolve_host(host, options.port,
1.493 djm 1201: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1202: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1203: if (direct)
1.403 djm 1204: cleanup_exit(255); /* logged in resolve_host */
1205: } else
1.443 djm 1206: check_follow_cname(direct, &host, cname);
1.400 djm 1207: }
1.139 markus 1208:
1.400 djm 1209: /*
1.408 djm 1210: * If canonicalisation is enabled then re-parse the configuration
1211: * files as new stanzas may match.
1.400 djm 1212: */
1.496 djm 1213: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1214: debug("hostname canonicalisation enabled, "
1215: "will re-parse configuration");
1216: want_final_pass = 1;
1217: }
1218:
1219: if (want_final_pass) {
1220: debug("re-parsing configuration");
1.408 djm 1221: free(options.hostname);
1222: options.hostname = xstrdup(host);
1.496 djm 1223: process_config_files(host_arg, pw, 1, NULL);
1.408 djm 1224: /*
1225: * Address resolution happens early with canonicalisation
1226: * enabled and the port number may have changed since, so
1227: * reset it in address list
1228: */
1229: if (addrs != NULL && options.port > 0)
1230: set_addrinfo_port(addrs, options.port);
1.139 markus 1231: }
1.31 markus 1232:
1233: /* Fill configuration defaults. */
1234: fill_default_options(&options);
1.443 djm 1235:
1236: /*
1237: * If ProxyJump option specified, then construct a ProxyCommand now.
1238: */
1239: if (options.jump_host != NULL) {
1240: char port_s[8];
1.478 djm 1241: const char *sshbin = argv0;
1.520 dtucker 1242: int port = options.port, jumpport = options.jump_port;
1243:
1244: if (port <= 0)
1245: port = default_ssh_port();
1246: if (jumpport <= 0)
1247: jumpport = default_ssh_port();
1248: if (strcmp(options.jump_host, host) == 0 && port == jumpport)
1249: fatal("jumphost loop via %s", options.jump_host);
1.478 djm 1250:
1251: /*
1252: * Try to use SSH indicated by argv[0], but fall back to
1253: * "ssh" if it appears unavailable.
1254: */
1255: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1256: sshbin = "ssh";
1.443 djm 1257:
1258: /* Consistency check */
1259: if (options.proxy_command != NULL)
1260: fatal("inconsistent options: ProxyCommand+ProxyJump");
1261: /* Never use FD passing for ProxyJump */
1262: options.proxy_use_fdpass = 0;
1263: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1264: xasprintf(&options.proxy_command,
1.478 djm 1265: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1266: sshbin,
1.443 djm 1267: /* Optional "-l user" argument if jump_user set */
1268: options.jump_user == NULL ? "" : " -l ",
1269: options.jump_user == NULL ? "" : options.jump_user,
1270: /* Optional "-p port" argument if jump_port set */
1271: options.jump_port <= 0 ? "" : " -p ",
1272: options.jump_port <= 0 ? "" : port_s,
1273: /* Optional additional jump hosts ",..." */
1274: options.jump_extra == NULL ? "" : " -J ",
1275: options.jump_extra == NULL ? "" : options.jump_extra,
1276: /* Optional "-F" argumment if -F specified */
1277: config == NULL ? "" : " -F ",
1278: config == NULL ? "" : config,
1279: /* Optional "-v" arguments if -v set */
1280: debug_flag ? " -" : "",
1281: debug_flag, "vvv",
1282: /* Mandatory hostname */
1283: options.jump_host);
1284: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1285: options.proxy_command);
1286: }
1.31 markus 1287:
1.400 djm 1288: if (options.port == 0)
1289: options.port = default_ssh_port();
1.463 djm 1290: channel_set_af(ssh, options.address_family);
1.196 djm 1291:
1.383 djm 1292: /* Tidy and check options */
1293: if (options.host_key_alias != NULL)
1294: lowercase(options.host_key_alias);
1295: if (options.proxy_command != NULL &&
1296: strcmp(options.proxy_command, "-") == 0 &&
1297: options.proxy_use_fdpass)
1298: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.516 markus 1299: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1300: if (options.control_persist && options.control_path != NULL) {
1301: debug("UpdateHostKeys=ask is incompatible with "
1302: "ControlPersist; disabling");
1303: options.update_hostkeys = 0;
1304: } else if (sshbuf_len(command) != 0 ||
1305: options.remote_command != NULL ||
1306: options.request_tty == REQUEST_TTY_NO) {
1307: debug("UpdateHostKeys=ask is incompatible with "
1308: "remote command execution; disabling");
1.517 djm 1309: options.update_hostkeys = 0;
1310: } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1311: /* no point logging anything; user won't see it */
1.516 markus 1312: options.update_hostkeys = 0;
1313: }
1.415 djm 1314: }
1.430 djm 1315: if (options.connection_attempts <= 0)
1316: fatal("Invalid number of ConnectionAttempts");
1317:
1.482 markus 1318: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1319: fatal("Cannot execute command-line and remote command.");
1320:
1321: /* Cannot fork to background if no command. */
1.482 markus 1322: if (fork_after_authentication_flag && sshbuf_len(command) == 0 &&
1.461 bluhm 1323: options.remote_command == NULL && !no_shell_flag)
1324: fatal("Cannot fork into background without a command "
1325: "to execute.");
1326:
1.31 markus 1327: /* reinit */
1.452 dtucker 1328: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.370 djm 1329:
1330: if (options.request_tty == REQUEST_TTY_YES ||
1331: options.request_tty == REQUEST_TTY_FORCE)
1332: tty_flag = 1;
1333:
1334: /* Allocate a tty by default if no command specified. */
1.482 markus 1335: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1336: tty_flag = options.request_tty != REQUEST_TTY_NO;
1337:
1338: /* Force no tty */
1.447 markus 1339: if (options.request_tty == REQUEST_TTY_NO ||
1340: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
1.370 djm 1341: tty_flag = 0;
1342: /* Do not allocate a tty if stdin is not a tty. */
1343: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1344: options.request_tty != REQUEST_TTY_FORCE) {
1345: if (tty_flag)
1346: logit("Pseudo-terminal will not be allocated because "
1347: "stdin is not a terminal.");
1348: tty_flag = 0;
1349: }
1.31 markus 1350:
1351: if (options.user == NULL)
1352: options.user = xstrdup(pw->pw_name);
1.343 djm 1353:
1.466 djm 1354: /* Set up strings used to percent_expand() arguments */
1.358 djm 1355: if (gethostname(thishost, sizeof(thishost)) == -1)
1356: fatal("gethostname: %s", strerror(errno));
1357: strlcpy(shorthost, thishost, sizeof(shorthost));
1358: shorthost[strcspn(thishost, ".")] = '\0';
1359: snprintf(portstr, sizeof(portstr), "%d", options.port);
1.479 djm 1360: snprintf(uidstr, sizeof(uidstr), "%llu",
1361: (unsigned long long)pw->pw_uid);
1.358 djm 1362:
1.522 dtucker 1363: conn_hash_hex = ssh_connection_hash(thishost, host, portstr,
1364: options.user);
1.405 djm 1365:
1.466 djm 1366: /*
1367: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1368: * after port-forwarding is set up, so it may pick up any local
1369: * tunnel interface name allocated.
1370: */
1.461 bluhm 1371: if (options.remote_command != NULL) {
1372: debug3("expanding RemoteCommand: %s", options.remote_command);
1373: cp = options.remote_command;
1.527 dtucker 1374: options.remote_command = default_client_percent_expand(cp,
1375: pw->pw_dir, host, options.user, pw->pw_name);
1.461 bluhm 1376: debug3("expanded RemoteCommand: %s", options.remote_command);
1377: free(cp);
1.482 markus 1378: if ((r = sshbuf_put(command, options.remote_command,
1379: strlen(options.remote_command))) != 0)
1380: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.304 dtucker 1381: }
1.31 markus 1382:
1.214 djm 1383: if (options.control_path != NULL) {
1.490 dtucker 1384: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1385: free(options.control_path);
1.528 dtucker 1386: options.control_path = default_client_percent_dollar_expand(cp,
1.527 dtucker 1387: pw->pw_dir, host, options.user, pw->pw_name);
1.378 djm 1388: free(cp);
1.214 djm 1389: }
1.408 djm 1390:
1.522 dtucker 1391: if (options.identity_agent != NULL) {
1392: p = tilde_expand_filename(options.identity_agent, getuid());
1.528 dtucker 1393: cp = default_client_percent_dollar_expand(p,
1.527 dtucker 1394: pw->pw_dir, host, options.user, pw->pw_name);
1.522 dtucker 1395: free(p);
1396: free(options.identity_agent);
1397: options.identity_agent = cp;
1398: }
1399:
1400: if (options.forward_agent_sock_path != NULL) {
1401: p = tilde_expand_filename(options.forward_agent_sock_path,
1402: getuid());
1.528 dtucker 1403: cp = default_client_percent_dollar_expand(p,
1.527 dtucker 1404: pw->pw_dir, host, options.user, pw->pw_name);
1.522 dtucker 1405: free(p);
1406: free(options.forward_agent_sock_path);
1407: options.forward_agent_sock_path = cp;
1.532 ! dtucker 1408: }
! 1409:
! 1410: for (j = 0; j < options.num_user_hostfiles; j++) {
! 1411: if (options.user_hostfiles[j] != NULL) {
! 1412: cp = tilde_expand_filename(options.user_hostfiles[j],
! 1413: getuid());
! 1414: p = default_client_percent_dollar_expand(cp,
! 1415: pw->pw_dir, host, options.user, pw->pw_name);
! 1416: if (strcmp(options.user_hostfiles[j], p) != 0)
! 1417: debug3("expanded UserKnownHostsFile '%s' -> "
! 1418: "'%s'", options.user_hostfiles[j], p);
! 1419: free(options.user_hostfiles[j]);
! 1420: free(cp);
! 1421: options.user_hostfiles[j] = p;
! 1422: }
1.522 dtucker 1423: }
1424:
1.527 dtucker 1425: for (i = 0; i < options.num_local_forwards; i++) {
1426: if (options.local_forwards[i].listen_path != NULL) {
1427: cp = options.local_forwards[i].listen_path;
1428: p = options.local_forwards[i].listen_path =
1429: default_client_percent_expand(cp,
1430: pw->pw_dir, host, options.user, pw->pw_name);
1431: if (strcmp(cp, p) != 0)
1432: debug3("expanded LocalForward listen path "
1433: "'%s' -> '%s'", cp, p);
1434: free(cp);
1435: }
1436: if (options.local_forwards[i].connect_path != NULL) {
1437: cp = options.local_forwards[i].connect_path;
1438: p = options.local_forwards[i].connect_path =
1439: default_client_percent_expand(cp,
1440: pw->pw_dir, host, options.user, pw->pw_name);
1441: if (strcmp(cp, p) != 0)
1442: debug3("expanded LocalForward connect path "
1443: "'%s' -> '%s'", cp, p);
1444: free(cp);
1445: }
1446: }
1447:
1448: for (i = 0; i < options.num_remote_forwards; i++) {
1449: if (options.remote_forwards[i].listen_path != NULL) {
1450: cp = options.remote_forwards[i].listen_path;
1451: p = options.remote_forwards[i].listen_path =
1452: default_client_percent_expand(cp,
1453: pw->pw_dir, host, options.user, pw->pw_name);
1454: if (strcmp(cp, p) != 0)
1455: debug3("expanded RemoteForward listen path "
1456: "'%s' -> '%s'", cp, p);
1457: free(cp);
1458: }
1459: if (options.remote_forwards[i].connect_path != NULL) {
1460: cp = options.remote_forwards[i].connect_path;
1461: p = options.remote_forwards[i].connect_path =
1462: default_client_percent_expand(cp,
1463: pw->pw_dir, host, options.user, pw->pw_name);
1464: if (strcmp(cp, p) != 0)
1465: debug3("expanded RemoteForward connect path "
1466: "'%s' -> '%s'", cp, p);
1467: free(cp);
1468: }
1469: }
1470:
1.408 djm 1471: if (config_test) {
1472: dump_client_config(&options, host);
1473: exit(0);
1.508 djm 1474: }
1475:
1476: /* Expand SecurityKeyProvider if it refers to an environment variable */
1477: if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1478: strlen(options.sk_provider) > 1) {
1479: if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1.518 naddy 1480: debug("Authenticator provider %s did not resolve; "
1.508 djm 1481: "disabling", options.sk_provider);
1482: free(options.sk_provider);
1483: options.sk_provider = NULL;
1484: } else {
1485: debug2("resolved SecurityKeyProvider %s => %s",
1486: options.sk_provider, cp);
1487: free(options.sk_provider);
1488: options.sk_provider = xstrdup(cp);
1489: }
1.408 djm 1490: }
1.405 djm 1491:
1.312 djm 1492: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1493: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1494: if (options.control_path != NULL) {
1495: int sock;
1496: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1497: ssh_packet_set_connection(ssh, sock, sock);
1.499 djm 1498: ssh_packet_set_mux(ssh);
1.447 markus 1499: goto skip_connect;
1500: }
1501: }
1.401 djm 1502:
1503: /*
1504: * If hostname canonicalisation was not enabled, then we may not
1505: * have yet resolved the hostname. Do so now.
1506: */
1507: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1508: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1509: if ((addrs = resolve_host(host, options.port, 1,
1510: cname, sizeof(cname))) == NULL)
1511: cleanup_exit(255); /* resolve_host logs the error */
1512: }
1.214 djm 1513:
1.303 djm 1514: timeout_ms = options.connection_timeout * 1000;
1515:
1.77 markus 1516: /* Open a connection to the remote host. */
1.511 beck 1517: if (ssh_connect(ssh, host, host_arg, addrs, &hostaddr, options.port,
1.385 djm 1518: options.address_family, options.connection_attempts,
1.488 dtucker 1519: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1520: exit(255);
1.31 markus 1521:
1.391 djm 1522: if (addrs != NULL)
1523: freeaddrinfo(addrs);
1524:
1.499 djm 1525: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1526: options.server_alive_count_max);
1527:
1.303 djm 1528: if (timeout_ms > 0)
1529: debug3("timeout: %d ms remain after connect", timeout_ms);
1530:
1.33 markus 1531: /*
1.485 dtucker 1532: * If we successfully made the connection and we have hostbased auth
1533: * enabled, load the public keys so we can later use the ssh-keysign
1534: * helper to sign challenges.
1.33 markus 1535: */
1.112 markus 1536: sensitive_data.nkeys = 0;
1537: sensitive_data.keys = NULL;
1.457 djm 1538: if (options.hostbased_authentication) {
1.486 dtucker 1539: sensitive_data.nkeys = 10;
1.274 deraadt 1540: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.483 markus 1541: sizeof(struct sshkey));
1542:
1543: /* XXX check errors? */
1.486 dtucker 1544: #define L_PUBKEY(p,o) do { \
1545: if ((o) >= sensitive_data.nkeys) \
1546: fatal("%s pubkey out of array bounds", __func__); \
1.483 markus 1547: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.486 dtucker 1548: p, "pubkey"); \
1549: } while (0)
1550: #define L_CERT(p,o) do { \
1551: if ((o) >= sensitive_data.nkeys) \
1552: fatal("%s cert out of array bounds", __func__); \
1553: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), p, "cert"); \
1554: } while (0)
1.177 markus 1555:
1.485 dtucker 1556: if (options.hostbased_authentication == 1) {
1.486 dtucker 1557: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1558: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1559: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1560: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1561: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1562: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1563: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1564: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1565: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1566: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.173 markus 1567: }
1.367 djm 1568: }
1.31 markus 1569:
1.104 markus 1570: /* load options.identity_files */
1.466 djm 1571: load_public_identity_files(pw);
1.439 markus 1572:
1.476 djm 1573: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1574: if (options.identity_agent &&
1575: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1576: if (strcmp(options.identity_agent, "none") == 0) {
1577: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1578: } else {
1.522 dtucker 1579: cp = options.identity_agent;
1.528 dtucker 1580: /* legacy (limited) format */
1581: if (cp[0] == '$' && cp[1] != '{') {
1.494 djm 1582: if (!valid_env_name(cp + 1)) {
1583: fatal("Invalid IdentityAgent "
1584: "environment variable name %s", cp);
1585: }
1586: if ((p = getenv(cp + 1)) == NULL)
1587: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1588: else
1589: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1590: } else {
1591: /* identity_agent specifies a path directly */
1592: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1593: }
1.510 djm 1594: }
1595: }
1596:
1.522 dtucker 1597: if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1.526 djm 1598: cp = options.forward_agent_sock_path;
1.510 djm 1599: if (cp[0] == '$') {
1600: if (!valid_env_name(cp + 1)) {
1601: fatal("Invalid ForwardAgent environment variable name %s", cp);
1602: }
1603: if ((p = getenv(cp + 1)) != NULL)
1604: forward_agent_sock_path = p;
1605: else
1606: options.forward_agent = 0;
1607: free(cp);
1608: } else {
1609: forward_agent_sock_path = cp;
1.439 markus 1610: }
1611: }
1.104 markus 1612:
1613: /* Expand ~ in known host file names. */
1.361 djm 1614: tilde_expand_paths(options.system_hostfiles,
1615: options.num_system_hostfiles);
1616: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1617:
1.512 dtucker 1618: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1619: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1620:
1.316 djm 1621: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1622: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1623: options.port, pw, timeout_ms);
1.339 djm 1624:
1.499 djm 1625: if (ssh_packet_connection_is_on_socket(ssh)) {
1.339 djm 1626: verbose("Authenticated to %s ([%s]:%d).", host,
1.437 djm 1627: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
1.339 djm 1628: } else {
1629: verbose("Authenticated to %s (via proxy).", host);
1630: }
1.31 markus 1631:
1.112 markus 1632: /* We no longer need the private host keys. Clear them now. */
1633: if (sensitive_data.nkeys != 0) {
1634: for (i = 0; i < sensitive_data.nkeys; i++) {
1635: if (sensitive_data.keys[i] != NULL) {
1636: /* Destroys contents safely */
1637: debug3("clear hostkey %d", i);
1.483 markus 1638: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1639: sensitive_data.keys[i] = NULL;
1640: }
1641: }
1.378 djm 1642: free(sensitive_data.keys);
1.134 markus 1643: }
1644: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1645: free(options.identity_files[i]);
1646: options.identity_files[i] = NULL;
1.134 markus 1647: if (options.identity_keys[i]) {
1.483 markus 1648: sshkey_free(options.identity_keys[i]);
1.134 markus 1649: options.identity_keys[i] = NULL;
1650: }
1.112 markus 1651: }
1.426 djm 1652: for (i = 0; i < options.num_certificate_files; i++) {
1653: free(options.certificate_files[i]);
1654: options.certificate_files[i] = NULL;
1655: }
1.31 markus 1656:
1.447 markus 1657: skip_connect:
1.466 djm 1658: exit_status = ssh_session2(ssh, pw);
1.499 djm 1659: ssh_packet_close(ssh);
1.186 djm 1660:
1.312 djm 1661: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1662: unlink(options.control_path);
1663:
1.353 djm 1664: /* Kill ProxyCommand if it is running. */
1665: ssh_kill_proxy_command();
1.186 djm 1666:
1.45 markus 1667: return exit_status;
1668: }
1669:
1.344 djm 1670: static void
1671: control_persist_detach(void)
1672: {
1673: pid_t pid;
1.438 djm 1674: int devnull, keep_stderr;
1.344 djm 1675:
1676: debug("%s: backgrounding master process", __func__);
1677:
1.473 djm 1678: /*
1679: * master (current process) into the background, and make the
1680: * foreground process a client of the backgrounded master.
1681: */
1.344 djm 1682: switch ((pid = fork())) {
1683: case -1:
1684: fatal("%s: fork: %s", __func__, strerror(errno));
1685: case 0:
1686: /* Child: master process continues mainloop */
1.473 djm 1687: break;
1688: default:
1.531 djm 1689: /* Parent: set up mux client to connect to backgrounded master */
1.344 djm 1690: debug2("%s: background process is %ld", __func__, (long)pid);
1691: stdin_null_flag = ostdin_null_flag;
1.359 djm 1692: options.request_tty = orequest_tty;
1.344 djm 1693: tty_flag = otty_flag;
1.473 djm 1694: close(muxserver_sock);
1695: muxserver_sock = -1;
1.351 markus 1696: options.control_master = SSHCTL_MASTER_NO;
1.473 djm 1697: muxclient(options.control_path);
1.344 djm 1698: /* muxclient() doesn't return on success. */
1.473 djm 1699: fatal("Failed to connect to new control master");
1700: }
1.346 djm 1701: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1702: error("%s: open(\"/dev/null\"): %s", __func__,
1703: strerror(errno));
1704: } else {
1.438 djm 1705: keep_stderr = log_is_on_stderr() && debug_flag;
1.346 djm 1706: if (dup2(devnull, STDIN_FILENO) == -1 ||
1.438 djm 1707: dup2(devnull, STDOUT_FILENO) == -1 ||
1708: (!keep_stderr && dup2(devnull, STDERR_FILENO) == -1))
1.346 djm 1709: error("%s: dup2: %s", __func__, strerror(errno));
1710: if (devnull > STDERR_FILENO)
1711: close(devnull);
1712: }
1.381 djm 1713: daemon(1, 1);
1.362 djm 1714: setproctitle("%s [mux]", options.control_path);
1.344 djm 1715: }
1716:
1717: /* Do fork() after authentication. Used by "ssh -f" */
1718: static void
1719: fork_postauth(void)
1720: {
1721: if (need_controlpersist_detach)
1722: control_persist_detach();
1723: debug("forking to background");
1724: fork_after_authentication_flag = 0;
1.505 deraadt 1725: if (daemon(1, 1) == -1)
1.344 djm 1726: fatal("daemon() failed: %.200s", strerror(errno));
1727: }
1728:
1.523 djm 1729: static void
1730: forwarding_success(void)
1731: {
1.524 djm 1732: if (forward_confirms_pending == -1)
1733: return;
1734: if (--forward_confirms_pending == 0) {
1.525 djm 1735: debug("%s: all expected forwarding replies received", __func__);
1.523 djm 1736: if (fork_after_authentication_flag)
1737: fork_postauth();
1.524 djm 1738: } else {
1739: debug2("%s: %d expected forwarding replies remaining",
1740: __func__, forward_confirms_pending);
1.523 djm 1741: }
1742: }
1743:
1.315 djm 1744: /* Callback for remote forward global requests */
1745: static void
1.463 djm 1746: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1747: {
1.406 millert 1748: struct Forward *rfwd = (struct Forward *)ctxt;
1.499 djm 1749: u_int port;
1750: int r;
1.315 djm 1751:
1.324 djm 1752: /* XXX verbose() on failure? */
1.404 markus 1753: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1754: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1755: rfwd->listen_path ? rfwd->listen_path :
1756: rfwd->listen_host ? rfwd->listen_host : "",
1757: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1758: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1759: rfwd->connect_host, rfwd->connect_port);
1760: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1761: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1.499 djm 1762: if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1763: fatal("%s: %s", __func__, ssh_err(r));
1764: if (port > 65535) {
1765: error("Invalid allocated port %u for remote "
1766: "forward to %s:%d", port,
1767: rfwd->connect_host, rfwd->connect_port);
1768: /* Ensure failure processing runs below */
1769: type = SSH2_MSG_REQUEST_FAILURE;
1770: channel_update_permission(ssh,
1771: rfwd->handle, -1);
1772: } else {
1773: rfwd->allocated_port = (int)port;
1774: logit("Allocated port %u for remote "
1775: "forward to %s:%d",
1776: rfwd->allocated_port, rfwd->connect_host,
1777: rfwd->connect_port);
1778: channel_update_permission(ssh,
1779: rfwd->handle, rfwd->allocated_port);
1780: }
1.366 markus 1781: } else {
1.480 djm 1782: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1783: }
1.324 djm 1784: }
1.468 djm 1785:
1.315 djm 1786: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1787: if (options.exit_on_forward_failure) {
1788: if (rfwd->listen_path != NULL)
1789: fatal("Error: remote port forwarding failed "
1790: "for listen path %s", rfwd->listen_path);
1791: else
1792: fatal("Error: remote port forwarding failed "
1793: "for listen port %d", rfwd->listen_port);
1794: } else {
1795: if (rfwd->listen_path != NULL)
1796: logit("Warning: remote port forwarding failed "
1797: "for listen path %s", rfwd->listen_path);
1798: else
1799: logit("Warning: remote port forwarding failed "
1800: "for listen port %d", rfwd->listen_port);
1801: }
1.315 djm 1802: }
1.523 djm 1803: forwarding_success();
1.315 djm 1804: }
1805:
1.126 itojun 1806: static void
1.463 djm 1807: client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
1.331 dtucker 1808: {
1809: debug("stdio forwarding: done");
1810: cleanup_exit(0);
1811: }
1812:
1.368 djm 1813: static void
1.463 djm 1814: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1815: {
1816: if (!success)
1817: fatal("stdio forwarding failed");
1818: }
1819:
1820: static void
1.523 djm 1821: ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
1822: {
1823: if (!success) {
1824: error("Tunnel forwarding failed");
1825: if (options.exit_on_forward_failure)
1826: cleanup_exit(255);
1827: }
1828:
1829: debug("%s: tunnel forward established, id=%d", __func__, id);
1830: forwarding_success();
1831: }
1832:
1833: static void
1.463 djm 1834: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1835: {
1836: Channel *c;
1.332 djm 1837: int in, out;
1.331 dtucker 1838:
1.441 dtucker 1839: if (options.stdio_forward_host == NULL)
1.368 djm 1840: return;
1841:
1.441 dtucker 1842: debug3("%s: %s:%d", __func__, options.stdio_forward_host,
1843: options.stdio_forward_port);
1.332 djm 1844:
1.505 deraadt 1845: if ((in = dup(STDIN_FILENO)) == -1 ||
1846: (out = dup(STDOUT_FILENO)) == -1)
1.332 djm 1847: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.463 djm 1848: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.441 dtucker 1849: options.stdio_forward_port, in, out)) == NULL)
1.368 djm 1850: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.463 djm 1851: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1852: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1853: }
1854:
1855: static void
1.466 djm 1856: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1857: {
1.86 markus 1858: int success = 0;
1.70 markus 1859: int i;
1.331 dtucker 1860:
1.524 djm 1861: if (options.exit_on_forward_failure)
1862: forward_confirms_pending = 0; /* track pending requests */
1.70 markus 1863: /* Initiate local TCP/IP port forwardings. */
1864: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1865: debug("Local connections to %.200s:%d forwarded to remote "
1866: "address %.200s:%d",
1.406 millert 1867: (options.local_forwards[i].listen_path != NULL) ?
1868: options.local_forwards[i].listen_path :
1.234 deraadt 1869: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1870: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1871: options.local_forwards[i].listen_host,
1872: options.local_forwards[i].listen_port,
1.406 millert 1873: (options.local_forwards[i].connect_path != NULL) ?
1874: options.local_forwards[i].connect_path :
1.232 djm 1875: options.local_forwards[i].connect_host,
1876: options.local_forwards[i].connect_port);
1.463 djm 1877: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1878: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1879: }
1.283 markus 1880: if (i > 0 && success != i && options.exit_on_forward_failure)
1881: fatal("Could not request local forwarding.");
1.86 markus 1882: if (i > 0 && success == 0)
1883: error("Could not request local forwarding.");
1.70 markus 1884:
1885: /* Initiate remote TCP/IP port forwardings. */
1886: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1887: debug("Remote connections from %.200s:%d forwarded to "
1888: "local address %.200s:%d",
1.406 millert 1889: (options.remote_forwards[i].listen_path != NULL) ?
1890: options.remote_forwards[i].listen_path :
1.248 djm 1891: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1892: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1893: options.remote_forwards[i].listen_port,
1.406 millert 1894: (options.remote_forwards[i].connect_path != NULL) ?
1895: options.remote_forwards[i].connect_path :
1.232 djm 1896: options.remote_forwards[i].connect_host,
1897: options.remote_forwards[i].connect_port);
1.523 djm 1898: if ((options.remote_forwards[i].handle =
1.463 djm 1899: channel_request_remote_forwarding(ssh,
1.523 djm 1900: &options.remote_forwards[i])) >= 0) {
1.463 djm 1901: client_register_global_confirm(
1902: ssh_confirm_remote_forward,
1.366 markus 1903: &options.remote_forwards[i]);
1.523 djm 1904: forward_confirms_pending++;
1905: } else if (options.exit_on_forward_failure)
1906: fatal("Could not request remote forwarding.");
1907: else
1908: logit("Warning: Could not request remote forwarding.");
1.70 markus 1909: }
1.301 djm 1910:
1911: /* Initiate tunnel forwarding. */
1912: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1913: if ((*ifname = client_request_tun_fwd(ssh,
1914: options.tun_open, options.tun_local,
1.523 djm 1915: options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
1916: forward_confirms_pending++;
1917: else if (options.exit_on_forward_failure)
1918: fatal("Could not request tunnel forwarding.");
1919: else
1920: error("Could not request tunnel forwarding.");
1.524 djm 1921: }
1922: if (forward_confirms_pending > 0) {
1923: debug("%s: expecting replies for %d forwards", __func__,
1924: forward_confirms_pending);
1.468 djm 1925: }
1.70 markus 1926: }
1927:
1.126 itojun 1928: static void
1.70 markus 1929: check_agent_present(void)
1930: {
1.412 djm 1931: int r;
1932:
1.70 markus 1933: if (options.forward_agent) {
1.254 djm 1934: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1935: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1936: options.forward_agent = 0;
1.412 djm 1937: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1938: debug("ssh_get_authentication_socket: %s",
1939: ssh_err(r));
1940: }
1.70 markus 1941: }
1942: }
1943:
1.214 djm 1944: static void
1.463 djm 1945: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 1946: {
1.215 djm 1947: extern char **environ;
1.243 djm 1948: const char *display;
1.499 djm 1949: int r, interactive = tty_flag;
1.433 djm 1950: char *proto = NULL, *data = NULL;
1.337 djm 1951:
1952: if (!success)
1953: return; /* No need for error message, channels code sens one */
1.215 djm 1954:
1.248 djm 1955: display = getenv("DISPLAY");
1.417 djm 1956: if (display == NULL && options.forward_x11)
1957: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 1958: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 1959: options.xauth_location, options.forward_x11_trusted,
1960: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 1961: /* Request forwarding with authentication spoofing. */
1.316 djm 1962: debug("Requesting X11 forwarding with authentication "
1963: "spoofing.");
1.463 djm 1964: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 1965: data, 1);
1.463 djm 1966: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 1967: /* XXX exit_on_forward_failure */
1.80 markus 1968: interactive = 1;
1.50 markus 1969: }
1970:
1.70 markus 1971: check_agent_present();
1972: if (options.forward_agent) {
1973: debug("Requesting authentication agent forwarding.");
1.463 djm 1974: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 1975: if ((r = sshpkt_send(ssh)) != 0)
1976: fatal("%s: %s", __func__, ssh_err(r));
1.212 djm 1977: }
1.369 dtucker 1978:
1979: /* Tell the packet module whether this is an interactive session. */
1.499 djm 1980: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 1981: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1982:
1.463 djm 1983: client_session2_setup(ssh, id, tty_flag, subsystem_flag, getenv("TERM"),
1.482 markus 1984: NULL, fileno(stdin), command, environ);
1.45 markus 1985: }
1986:
1.143 markus 1987: /* open new channel for a session */
1.126 itojun 1988: static int
1.463 djm 1989: ssh_session2_open(struct ssh *ssh)
1.45 markus 1990: {
1.118 markus 1991: Channel *c;
1992: int window, packetmax, in, out, err;
1.60 markus 1993:
1.62 markus 1994: if (stdin_null_flag) {
1.93 itojun 1995: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1996: } else {
1997: in = dup(STDIN_FILENO);
1998: }
1.60 markus 1999: out = dup(STDOUT_FILENO);
2000: err = dup(STDERR_FILENO);
1.45 markus 2001:
1.505 deraadt 2002: if (in == -1 || out == -1 || err == -1)
1.62 markus 2003: fatal("dup() in/out/err failed");
1.45 markus 2004:
1.69 markus 2005: /* enable nonblocking unless tty */
2006: if (!isatty(in))
2007: set_nonblock(in);
2008: if (!isatty(out))
2009: set_nonblock(out);
2010: if (!isatty(err))
2011: set_nonblock(err);
2012:
1.65 markus 2013: window = CHAN_SES_WINDOW_DEFAULT;
2014: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 2015: if (tty_flag) {
2016: window >>= 1;
2017: packetmax >>= 1;
1.45 markus 2018: }
1.463 djm 2019: c = channel_new(ssh,
1.45 markus 2020: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 2021: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 2022: "client-session", /*nonblock*/0);
1.45 markus 2023:
1.463 djm 2024: debug3("%s: channel_new: %d", __func__, c->self);
1.106 markus 2025:
1.463 djm 2026: channel_send_open(ssh, c->self);
1.143 markus 2027: if (!no_shell_flag)
1.463 djm 2028: channel_register_open_confirm(ssh, c->self,
1.310 djm 2029: ssh_session2_setup, NULL);
1.106 markus 2030:
1.118 markus 2031: return c->self;
1.106 markus 2032: }
2033:
1.126 itojun 2034: static int
1.466 djm 2035: ssh_session2(struct ssh *ssh, struct passwd *pw)
1.106 markus 2036: {
1.499 djm 2037: int r, devnull, id = -1;
1.466 djm 2038: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 2039:
2040: /* XXX should be pre-session */
1.368 djm 2041: if (!options.control_persist)
1.463 djm 2042: ssh_init_stdio_forwarding(ssh);
1.466 djm 2043:
2044: ssh_init_forwarding(ssh, &tun_fwd_ifname);
2045:
2046: if (options.local_command != NULL) {
2047: debug3("expanding LocalCommand: %s", options.local_command);
2048: cp = options.local_command;
2049: options.local_command = percent_expand(cp,
1.522 dtucker 2050: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS,
1.466 djm 2051: "d", pw->pw_dir,
2052: "h", host,
2053: "r", options.user,
2054: "u", pw->pw_name,
2055: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2056: (char *)NULL);
2057: debug3("expanded LocalCommand: %s", options.local_command);
2058: free(cp);
2059: }
1.106 markus 2060:
1.344 djm 2061: /* Start listening for multiplex clients */
1.499 djm 2062: if (!ssh_packet_get_mux(ssh))
1.463 djm 2063: muxserver_listen(ssh);
1.344 djm 2064:
1.473 djm 2065: /*
1.368 djm 2066: * If we are in control persist mode and have a working mux listen
2067: * socket, then prepare to background ourselves and have a foreground
1.531 djm 2068: * client attach as a control client.
1.368 djm 2069: * NB. we must save copies of the flags that we override for
1.531 djm 2070: * the backgrounding, since we defer attachment of the client until
1.344 djm 2071: * after the connection is fully established (in particular,
2072: * async rfwd replies have been received for ExitOnForwardFailure).
2073: */
1.473 djm 2074: if (options.control_persist && muxserver_sock != -1) {
1.344 djm 2075: ostdin_null_flag = stdin_null_flag;
2076: ono_shell_flag = no_shell_flag;
1.359 djm 2077: orequest_tty = options.request_tty;
1.344 djm 2078: otty_flag = tty_flag;
1.473 djm 2079: stdin_null_flag = 1;
2080: no_shell_flag = 1;
2081: tty_flag = 0;
1.344 djm 2082: if (!fork_after_authentication_flag)
2083: need_controlpersist_detach = 1;
2084: fork_after_authentication_flag = 1;
1.473 djm 2085: }
1.368 djm 2086: /*
2087: * ControlPersist mux listen socket setup failed, attempt the
2088: * stdio forward setup that we skipped earlier.
2089: */
2090: if (options.control_persist && muxserver_sock == -1)
1.463 djm 2091: ssh_init_stdio_forwarding(ssh);
1.344 djm 2092:
1.471 djm 2093: if (!no_shell_flag)
1.463 djm 2094: id = ssh_session2_open(ssh);
1.379 djm 2095: else {
1.499 djm 2096: ssh_packet_set_interactive(ssh,
1.379 djm 2097: options.control_master == SSHCTL_MASTER_NO,
2098: options.ip_qos_interactive, options.ip_qos_bulk);
2099: }
1.314 djm 2100:
2101: /* If we don't expect to open a new session, then disallow it */
1.319 markus 2102: if (options.control_master == SSHCTL_MASTER_NO &&
2103: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 2104: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 2105: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2106: (r = sshpkt_put_cstring(ssh,
2107: "no-more-sessions@openssh.com")) != 0 ||
2108: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2109: (r = sshpkt_send(ssh)) != 0)
2110: fatal("%s: %s", __func__, ssh_err(r));
1.314 djm 2111: }
1.255 reyk 2112:
2113: /* Execute a local command */
2114: if (options.local_command != NULL &&
2115: options.permit_local_command)
2116: ssh_local_cmd(options.local_command);
1.467 djm 2117:
2118: /*
2119: * stdout is now owned by the session channel; clobber it here
2120: * so future channel closes are propagated to the local fd.
2121: * NB. this can only happen after LocalCommand has completed,
2122: * as it may want to write to stdout.
2123: */
1.469 djm 2124: if (!need_controlpersist_detach) {
2125: if ((devnull = open(_PATH_DEVNULL, O_WRONLY)) == -1)
2126: error("%s: open %s: %s", __func__,
2127: _PATH_DEVNULL, strerror(errno));
1.505 deraadt 2128: if (dup2(devnull, STDOUT_FILENO) == -1)
1.469 djm 2129: fatal("%s: dup2() stdout failed", __func__);
2130: if (devnull > STDERR_FILENO)
2131: close(devnull);
2132: }
1.301 djm 2133:
1.342 djm 2134: /*
2135: * If requested and we are not interested in replies to remote
2136: * forwarding requests, then let ssh continue in the background.
2137: */
1.344 djm 2138: if (fork_after_authentication_flag) {
2139: if (options.exit_on_forward_failure &&
2140: options.num_remote_forwards > 0) {
2141: debug("deferring postauth fork until remote forward "
2142: "confirmation received");
2143: } else
2144: fork_postauth();
1.318 djm 2145: }
1.31 markus 2146:
1.463 djm 2147: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2148: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2149: }
2150:
1.426 djm 2151: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2152: static void
1.466 djm 2153: load_public_identity_files(struct passwd *pw)
1.104 markus 2154: {
1.466 djm 2155: char *filename, *cp;
1.460 markus 2156: struct sshkey *public;
1.426 djm 2157: int i;
2158: u_int n_ids, n_certs;
1.335 djm 2159: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2160: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2161: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2162: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2163: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2164: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2165: #ifdef ENABLE_PKCS11
1.514 djm 2166: struct sshkey **keys = NULL;
2167: char **comments = NULL;
1.333 markus 2168: int nkeys;
1.335 djm 2169: #endif /* PKCS11 */
1.104 markus 2170:
1.426 djm 2171: n_ids = n_certs = 0;
1.398 tedu 2172: memset(identity_files, 0, sizeof(identity_files));
2173: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2174: memset(identity_file_userprovided, 0,
2175: sizeof(identity_file_userprovided));
1.426 djm 2176: memset(certificate_files, 0, sizeof(certificate_files));
2177: memset(certificates, 0, sizeof(certificates));
1.484 djm 2178: memset(certificate_file_userprovided, 0,
2179: sizeof(certificate_file_userprovided));
1.335 djm 2180:
2181: #ifdef ENABLE_PKCS11
1.333 markus 2182: if (options.pkcs11_provider != NULL &&
1.167 markus 2183: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2184: (pkcs11_init(!options.batch_mode) == 0) &&
2185: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1.514 djm 2186: &keys, &comments)) > 0) {
1.333 markus 2187: for (i = 0; i < nkeys; i++) {
1.335 djm 2188: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2189: sshkey_free(keys[i]);
1.514 djm 2190: free(comments[i]);
1.335 djm 2191: continue;
2192: }
2193: identity_keys[n_ids] = keys[i];
1.514 djm 2194: identity_files[n_ids] = comments[i]; /* transferred */
1.335 djm 2195: n_ids++;
1.167 markus 2196: }
1.378 djm 2197: free(keys);
1.514 djm 2198: free(comments);
1.127 markus 2199: }
1.333 markus 2200: #endif /* ENABLE_PKCS11 */
1.335 djm 2201: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2202: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2203: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2204: free(options.identity_files[i]);
1.426 djm 2205: options.identity_files[i] = NULL;
1.335 djm 2206: continue;
2207: }
1.490 dtucker 2208: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.528 dtucker 2209: filename = default_client_percent_dollar_expand(cp,
1.527 dtucker 2210: pw->pw_dir, host, options.user, pw->pw_name);
1.378 djm 2211: free(cp);
1.483 markus 2212: check_load(sshkey_load_public(filename, &public, NULL),
2213: filename, "pubkey");
1.131 millert 2214: debug("identity file %s type %d", filename,
2215: public ? public->type : -1);
1.378 djm 2216: free(options.identity_files[i]);
1.335 djm 2217: identity_files[n_ids] = filename;
2218: identity_keys[n_ids] = public;
1.484 djm 2219: identity_file_userprovided[n_ids] =
2220: options.identity_file_userprovided[i];
1.335 djm 2221: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2222: continue;
2223:
1.426 djm 2224: /*
2225: * If no certificates have been explicitly listed then try
2226: * to add the default certificate variant too.
2227: */
2228: if (options.num_certificate_files != 0)
2229: continue;
1.335 djm 2230: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2231: check_load(sshkey_load_public(cp, &public, NULL),
2232: filename, "pubkey");
1.335 djm 2233: debug("identity file %s type %d", cp,
2234: public ? public->type : -1);
2235: if (public == NULL) {
1.378 djm 2236: free(cp);
1.335 djm 2237: continue;
2238: }
1.483 markus 2239: if (!sshkey_is_cert(public)) {
1.335 djm 2240: debug("%s: key %s type %s is not a certificate",
1.483 markus 2241: __func__, cp, sshkey_type(public));
2242: sshkey_free(public);
1.378 djm 2243: free(cp);
1.335 djm 2244: continue;
2245: }
1.448 djm 2246: /* NB. leave filename pointing to private key */
2247: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2248: identity_keys[n_ids] = public;
1.484 djm 2249: identity_file_userprovided[n_ids] =
2250: options.identity_file_userprovided[i];
1.335 djm 2251: n_ids++;
2252: }
1.426 djm 2253:
2254: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
2255: fatal("%s: too many certificates", __func__);
2256: for (i = 0; i < options.num_certificate_files; i++) {
2257: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2258: getuid());
1.528 dtucker 2259: filename = default_client_percent_dollar_expand(cp,
1.527 dtucker 2260: pw->pw_dir, host, options.user, pw->pw_name);
1.426 djm 2261: free(cp);
2262:
1.483 markus 2263: check_load(sshkey_load_public(filename, &public, NULL),
2264: filename, "certificate");
1.426 djm 2265: debug("certificate file %s type %d", filename,
2266: public ? public->type : -1);
2267: free(options.certificate_files[i]);
2268: options.certificate_files[i] = NULL;
2269: if (public == NULL) {
2270: free(filename);
2271: continue;
2272: }
1.483 markus 2273: if (!sshkey_is_cert(public)) {
1.426 djm 2274: debug("%s: key %s type %s is not a certificate",
1.483 markus 2275: __func__, filename, sshkey_type(public));
2276: sshkey_free(public);
1.426 djm 2277: free(filename);
2278: continue;
2279: }
2280: certificate_files[n_certs] = filename;
2281: certificates[n_certs] = public;
1.484 djm 2282: certificate_file_userprovided[n_certs] =
2283: options.certificate_file_userprovided[i];
1.426 djm 2284: ++n_certs;
2285: }
2286:
1.335 djm 2287: options.num_identity_files = n_ids;
2288: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2289: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2290: memcpy(options.identity_file_userprovided,
2291: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2292:
2293: options.num_certificate_files = n_certs;
2294: memcpy(options.certificate_files,
2295: certificate_files, sizeof(certificate_files));
2296: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2297: memcpy(options.certificate_file_userprovided,
2298: certificate_file_userprovided,
2299: sizeof(certificate_file_userprovided));
1.214 djm 2300: }
1.352 djm 2301:
2302: static void
2303: main_sigchld_handler(int sig)
2304: {
2305: int save_errno = errno;
2306: pid_t pid;
2307: int status;
2308:
2309: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2310: (pid == -1 && errno == EINTR))
1.352 djm 2311: ;
2312: errno = save_errno;
2313: }