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