Annotation of src/usr.bin/ssh/ssh.c, Revision 1.529
1.529 ! dtucker 1: /* $OpenBSD: ssh.c,v 1.528 2020/05/29 04:25:40 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
124: * a new slave launched in the foreground for ControlPersist.
125: */
126: int need_controlpersist_detach = 0;
127:
128: /* Copies of flags for ControlPersist foreground slave */
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;
1.466 djm 632: char *p, *cp, *line, *argv0, buf[PATH_MAX], *logfile;
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;
1.250 djm 641:
642: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
643: sanitise_stdfd();
1.31 markus 644:
1.33 markus 645: /*
1.346 djm 646: * Discard other fds that are hanging around. These can cause problem
647: * with backgrounded ssh processes started by ControlPersist.
648: */
649: closefrom(STDERR_FILENO + 1);
650:
1.487 dtucker 651: if (getuid() != geteuid())
652: fatal("ssh setuid not supported.");
653: if (getgid() != getegid())
654: fatal("ssh setgid not supported.");
1.184 stevesk 655:
1.107 markus 656: /* Get user data. */
1.490 dtucker 657: pw = getpwuid(getuid());
1.107 markus 658: if (!pw) {
1.490 dtucker 659: logit("No user exists for uid %lu", (u_long)getuid());
1.257 dtucker 660: exit(255);
1.107 markus 661: }
662: /* Take a copy of the returned structure. */
663: pw = pwcopy(pw);
1.31 markus 664:
1.33 markus 665: /*
666: * Set our umask to something reasonable, as some files are created
667: * with the default umask. This will make them world-readable but
668: * writable only by the owner, which is ok for all files for which we
669: * don't set the modes explicitly.
670: */
1.31 markus 671: umask(022);
1.445 djm 672:
673: setlocale(LC_CTYPE, "");
1.31 markus 674:
1.316 djm 675: /*
676: * Initialize option structure to indicate that no values have been
677: * set.
678: */
1.31 markus 679: initialize_options(&options);
680:
1.463 djm 681: /*
682: * Prepare main ssh transport/connection structures
683: */
684: if ((ssh = ssh_alloc_session_state()) == NULL)
685: fatal("Couldn't allocate session state");
686: channel_init_channels(ssh);
687:
1.31 markus 688: /* Parse command-line arguments. */
689: host = NULL;
1.320 djm 690: use_syslog = 0;
1.375 dtucker 691: logfile = NULL;
1.325 markus 692: argv0 = av[0];
1.31 markus 693:
1.266 djm 694: again:
1.316 djm 695: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.474 djm 696: "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 697: switch (opt) {
1.91 jakob 698: case '1':
1.454 djm 699: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 700: break;
1.47 markus 701: case '2':
1.454 djm 702: /* Ignored */
1.47 markus 703: break;
1.37 markus 704: case '4':
1.196 djm 705: options.address_family = AF_INET;
1.37 markus 706: break;
707: case '6':
1.196 djm 708: options.address_family = AF_INET6;
1.37 markus 709: break;
1.31 markus 710: case 'n':
711: stdin_null_flag = 1;
712: break;
713: case 'f':
714: fork_after_authentication_flag = 1;
715: stdin_null_flag = 1;
716: break;
717: case 'x':
718: options.forward_x11 = 0;
719: break;
720: case 'X':
721: options.forward_x11 = 1;
722: break;
1.320 djm 723: case 'y':
724: use_syslog = 1;
725: break;
1.375 dtucker 726: case 'E':
1.422 dtucker 727: logfile = optarg;
1.375 dtucker 728: break;
1.408 djm 729: case 'G':
730: config_test = 1;
731: break;
1.202 markus 732: case 'Y':
733: options.forward_x11 = 1;
734: options.forward_x11_trusted = 1;
735: break;
1.31 markus 736: case 'g':
1.406 millert 737: options.fwd_opts.gateway_ports = 1;
1.31 markus 738: break;
1.229 djm 739: case 'O':
1.441 dtucker 740: if (options.stdio_forward_host != NULL)
1.332 djm 741: fatal("Cannot specify multiplexing "
742: "command with -W");
743: else if (muxclient_command != 0)
744: fatal("Multiplexing command already specified");
1.229 djm 745: if (strcmp(optarg, "check") == 0)
1.312 djm 746: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 747: else if (strcmp(optarg, "forward") == 0)
748: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 749: else if (strcmp(optarg, "exit") == 0)
1.312 djm 750: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 751: else if (strcmp(optarg, "stop") == 0)
752: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 753: else if (strcmp(optarg, "cancel") == 0)
754: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 755: else if (strcmp(optarg, "proxy") == 0)
756: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 757: else
758: fatal("Invalid multiplex command.");
759: break;
1.183 stevesk 760: case 'P': /* deprecated */
1.376 djm 761: break;
1.394 deraadt 762: case 'Q':
1.376 djm 763: cp = NULL;
1.519 dtucker 764: if (strcmp(optarg, "cipher") == 0 ||
765: strcasecmp(optarg, "Ciphers") == 0)
1.393 djm 766: cp = cipher_alg_list('\n', 0);
1.394 deraadt 767: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 768: cp = cipher_alg_list('\n', 1);
1.519 dtucker 769: else if (strcmp(optarg, "mac") == 0 ||
770: strcasecmp(optarg, "MACs") == 0)
1.392 dtucker 771: cp = mac_alg_list('\n');
1.519 dtucker 772: else if (strcmp(optarg, "kex") == 0 ||
773: strcasecmp(optarg, "KexAlgorithms") == 0)
1.392 dtucker 774: cp = kex_alg_list('\n');
1.394 deraadt 775: else if (strcmp(optarg, "key") == 0)
1.451 djm 776: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 777: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 778: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 779: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 780: cp = sshkey_alg_list(0, 1, 0, '\n');
1.519 dtucker 781: else if (strcmp(optarg, "key-sig") == 0 ||
782: strcasecmp(optarg, "PubkeyAcceptedKeyTypes") == 0 ||
783: strcasecmp(optarg, "HostKeyAlgorithms") == 0 ||
784: strcasecmp(optarg, "HostbasedKeyTypes") == 0 ||
785: strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 0)
786: cp = sshkey_alg_list(0, 0, 1, '\n');
1.491 djm 787: else if (strcmp(optarg, "sig") == 0)
1.492 djm 788: cp = sshkey_alg_list(0, 1, 1, '\n');
1.491 djm 789: else if (strcmp(optarg, "protocol-version") == 0)
1.416 djm 790: cp = xstrdup("2");
1.513 dtucker 791: else if (strcmp(optarg, "compression") == 0) {
792: cp = xstrdup(compression_alg_list(0));
793: len = strlen(cp);
794: for (n = 0; n < len; n++)
795: if (cp[n] == ',')
796: cp[n] = '\n';
797: } else if (strcmp(optarg, "help") == 0) {
1.491 djm 798: cp = xstrdup(
1.513 dtucker 799: "cipher\ncipher-auth\ncompression\nkex\n"
1.519 dtucker 800: "key\nkey-cert\nkey-plain\nkey-sig\nmac\n"
1.491 djm 801: "protocol-version\nsig");
1.416 djm 802: }
1.376 djm 803: if (cp == NULL)
804: fatal("Unsupported query \"%s\"", optarg);
805: printf("%s\n", cp);
806: free(cp);
807: exit(0);
1.31 markus 808: break;
809: case 'a':
810: options.forward_agent = 0;
1.53 markus 811: break;
812: case 'A':
813: options.forward_agent = 1;
1.31 markus 814: break;
815: case 'k':
1.204 dtucker 816: options.gss_deleg_creds = 0;
1.297 djm 817: break;
818: case 'K':
819: options.gss_authentication = 1;
820: options.gss_deleg_creds = 1;
1.31 markus 821: break;
822: case 'i':
1.490 dtucker 823: p = tilde_expand_filename(optarg, getuid());
1.505 deraadt 824: if (stat(p, &st) == -1)
1.128 fgsch 825: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 826: "not accessible: %s.\n", p,
1.231 otto 827: strerror(errno));
1.429 dtucker 828: else
829: add_identity_file(&options, NULL, p, 1);
830: free(p);
1.31 markus 831: break;
1.127 markus 832: case 'I':
1.333 markus 833: #ifdef ENABLE_PKCS11
1.422 dtucker 834: free(options.pkcs11_provider);
1.333 markus 835: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 836: #else
1.333 markus 837: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 838: #endif
1.127 markus 839: break;
1.443 djm 840: case 'J':
1.504 djm 841: if (options.jump_host != NULL) {
842: fatal("Only a single -J option is permitted "
843: "(use commas to separate multiple "
844: "jump hops)");
845: }
1.443 djm 846: if (options.proxy_command != NULL)
847: fatal("Cannot specify -J with ProxyCommand");
848: if (parse_jump(optarg, &options, 1) == -1)
849: fatal("Invalid -J argument");
850: options.proxy_command = xstrdup("none");
851: break;
1.31 markus 852: case 't':
1.359 djm 853: if (options.request_tty == REQUEST_TTY_YES)
854: options.request_tty = REQUEST_TTY_FORCE;
855: else
856: options.request_tty = REQUEST_TTY_YES;
1.31 markus 857: break;
858: case 'v':
1.197 markus 859: if (debug_flag == 0) {
1.66 markus 860: debug_flag = 1;
861: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 862: } else {
1.443 djm 863: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
864: debug_flag++;
1.197 markus 865: options.log_level++;
1.443 djm 866: }
1.197 markus 867: }
1.375 dtucker 868: break;
1.31 markus 869: case 'V':
1.209 markus 870: fprintf(stderr, "%s, %s\n",
1.402 markus 871: SSH_VERSION,
872: #ifdef WITH_OPENSSL
1.495 djm 873: OpenSSL_version(OPENSSL_VERSION)
1.402 markus 874: #else
875: "without OpenSSL"
876: #endif
877: );
1.31 markus 878: if (opt == 'V')
879: exit(0);
880: break;
1.255 reyk 881: case 'w':
1.256 reyk 882: if (options.tun_open == -1)
883: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 884: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 885: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 886: fprintf(stderr,
887: "Bad tun device '%s'\n", optarg);
1.257 dtucker 888: exit(255);
1.255 reyk 889: }
890: break;
1.331 dtucker 891: case 'W':
1.441 dtucker 892: if (options.stdio_forward_host != NULL)
1.332 djm 893: fatal("stdio forward already specified");
894: if (muxclient_command != 0)
895: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 896: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 897: options.stdio_forward_host = fwd.listen_host;
898: options.stdio_forward_port = fwd.listen_port;
1.378 djm 899: free(fwd.connect_host);
1.331 dtucker 900: } else {
901: fprintf(stderr,
902: "Bad stdio forwarding specification '%s'\n",
903: optarg);
904: exit(255);
905: }
1.359 djm 906: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 907: no_shell_flag = 1;
908: break;
1.31 markus 909: case 'q':
910: options.log_level = SYSLOG_LEVEL_QUIET;
911: break;
912: case 'e':
913: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 914: (u_char) optarg[1] >= 64 &&
915: (u_char) optarg[1] < 128)
1.78 markus 916: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 917: else if (strlen(optarg) == 1)
1.78 markus 918: options.escape_char = (u_char) optarg[0];
1.31 markus 919: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 920: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 921: else {
1.128 fgsch 922: fprintf(stderr, "Bad escape character '%s'.\n",
923: optarg);
1.257 dtucker 924: exit(255);
1.31 markus 925: }
926: break;
927: case 'c':
1.506 naddy 928: if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
1.420 djm 929: optarg + 1 : optarg)) {
930: fprintf(stderr, "Unknown cipher type '%s'\n",
931: optarg);
932: exit(255);
1.95 markus 933: }
1.456 djm 934: free(options.ciphers);
935: options.ciphers = xstrdup(optarg);
1.95 markus 936: break;
937: case 'm':
1.422 dtucker 938: if (mac_valid(optarg)) {
939: free(options.macs);
1.95 markus 940: options.macs = xstrdup(optarg);
1.422 dtucker 941: } else {
1.128 fgsch 942: fprintf(stderr, "Unknown mac type '%s'\n",
943: optarg);
1.257 dtucker 944: exit(255);
1.31 markus 945: }
946: break;
1.214 djm 947: case 'M':
1.242 djm 948: if (options.control_master == SSHCTL_MASTER_YES)
949: options.control_master = SSHCTL_MASTER_ASK;
950: else
951: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 952: break;
1.31 markus 953: case 'p':
1.465 millert 954: if (options.port == -1) {
955: options.port = a2port(optarg);
956: if (options.port <= 0) {
957: fprintf(stderr, "Bad port '%s'\n",
958: optarg);
959: exit(255);
960: }
1.109 markus 961: }
1.31 markus 962: break;
963: case 'l':
1.465 millert 964: if (options.user == NULL)
965: options.user = optarg;
1.31 markus 966: break;
1.141 stevesk 967:
968: case 'L':
1.324 djm 969: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 970: add_local_forward(&options, &fwd);
971: else {
1.128 fgsch 972: fprintf(stderr,
1.232 djm 973: "Bad local forwarding specification '%s'\n",
1.128 fgsch 974: optarg);
1.257 dtucker 975: exit(255);
1.31 markus 976: }
1.232 djm 977: break;
978:
979: case 'R':
1.464 markus 980: if (parse_forward(&fwd, optarg, 0, 1) ||
981: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 982: add_remote_forward(&options, &fwd);
983: } else {
1.128 fgsch 984: fprintf(stderr,
1.232 djm 985: "Bad remote forwarding specification "
986: "'%s'\n", optarg);
1.257 dtucker 987: exit(255);
1.31 markus 988: }
989: break;
1.108 markus 990:
991: case 'D':
1.324 djm 992: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 993: add_local_forward(&options, &fwd);
1.232 djm 994: } else {
1.322 stevesk 995: fprintf(stderr,
996: "Bad dynamic forwarding specification "
997: "'%s'\n", optarg);
1.257 dtucker 998: exit(255);
1.109 markus 999: }
1.108 markus 1000: break;
1001:
1.31 markus 1002: case 'C':
1.513 dtucker 1003: #ifdef WITH_ZLIB
1.31 markus 1004: options.compression = 1;
1.513 dtucker 1005: #else
1006: error("Compression not supported, disabling.");
1007: #endif
1.31 markus 1008: break;
1.45 markus 1009: case 'N':
1010: no_shell_flag = 1;
1.359 djm 1011: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1012: break;
1013: case 'T':
1.359 djm 1014: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1015: break;
1.31 markus 1016: case 'o':
1.205 markus 1017: line = xstrdup(optarg);
1.408 djm 1018: if (process_config_line(&options, pw,
1019: host ? host : "", host ? host : "", line,
1020: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 1021: exit(255);
1.378 djm 1022: free(line);
1.31 markus 1023: break;
1.85 djm 1024: case 's':
1025: subsystem_flag = 1;
1.117 markus 1026: break;
1.214 djm 1027: case 'S':
1.431 mmcc 1028: free(options.control_path);
1.214 djm 1029: options.control_path = xstrdup(optarg);
1030: break;
1.117 markus 1031: case 'b':
1032: options.bind_address = optarg;
1.474 djm 1033: break;
1034: case 'B':
1035: options.bind_interface = optarg;
1.85 djm 1036: break;
1.139 markus 1037: case 'F':
1038: config = optarg;
1039: break;
1.31 markus 1040: default:
1041: usage();
1.1 deraadt 1042: }
1.31 markus 1043: }
1044:
1.462 djm 1045: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
1046: opt_terminated = 1;
1047:
1.128 fgsch 1048: ac -= optind;
1049: av += optind;
1050:
1.329 guenther 1051: if (ac > 0 && !host) {
1.465 millert 1052: int tport;
1053: char *tuser;
1054: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
1055: case -1:
1056: usage();
1057: break;
1058: case 0:
1059: if (options.user == NULL) {
1060: options.user = tuser;
1061: tuser = NULL;
1062: }
1063: free(tuser);
1064: if (options.port == -1 && tport != -1)
1065: options.port = tport;
1066: break;
1067: default:
1.128 fgsch 1068: p = xstrdup(*av);
1.188 markus 1069: cp = strrchr(p, '@');
1.465 millert 1070: if (cp != NULL) {
1071: if (cp == p)
1072: usage();
1073: if (options.user == NULL) {
1074: options.user = p;
1075: p = NULL;
1076: }
1077: *cp++ = '\0';
1078: host = xstrdup(cp);
1079: free(p);
1080: } else
1081: host = p;
1082: break;
1083: }
1.462 djm 1084: if (ac > 1 && !opt_terminated) {
1.189 millert 1085: optind = optreset = 1;
1.128 fgsch 1086: goto again;
1087: }
1.189 millert 1088: ac--, av++;
1.128 fgsch 1089: }
1090:
1.31 markus 1091: /* Check that we got a host name. */
1092: if (!host)
1093: usage();
1094:
1.385 djm 1095: host_arg = xstrdup(host);
1096:
1.402 markus 1097: #ifdef WITH_OPENSSL
1.350 djm 1098: OpenSSL_add_all_algorithms();
1.72 markus 1099: ERR_load_crypto_strings();
1.402 markus 1100: #endif
1.31 markus 1101:
1102: /* Initialize the command to execute on remote host. */
1.482 markus 1103: if ((command = sshbuf_new()) == NULL)
1104: fatal("sshbuf_new failed");
1.1 deraadt 1105:
1.33 markus 1106: /*
1107: * Save the command to execute on the remote host in a buffer. There
1108: * is no limit on the length of the command, except by the maximum
1109: * packet size. Also sets the tty flag if there is no command.
1110: */
1.128 fgsch 1111: if (!ac) {
1.31 markus 1112: /* No command specified - execute shell on a tty. */
1.85 djm 1113: if (subsystem_flag) {
1.128 fgsch 1114: fprintf(stderr,
1115: "You must specify a subsystem to invoke.\n");
1.85 djm 1116: usage();
1117: }
1.31 markus 1118: } else {
1.128 fgsch 1119: /* A command has been specified. Store it into the buffer. */
1120: for (i = 0; i < ac; i++) {
1.482 markus 1121: if ((r = sshbuf_putf(command, "%s%s",
1122: i ? " " : "", av[i])) != 0)
1123: fatal("%s: buffer error: %s",
1124: __func__, ssh_err(r));
1.31 markus 1125: }
1126: }
1127:
1.101 markus 1128: /*
1129: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1130: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1131: */
1.375 dtucker 1132: if (use_syslog && logfile != NULL)
1133: fatal("Can't specify both -y and -E");
1.422 dtucker 1134: if (logfile != NULL)
1.375 dtucker 1135: log_redirect_stderr_to(logfile);
1.325 markus 1136: log_init(argv0,
1.468 djm 1137: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1138: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1139: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1140: SYSLOG_FACILITY_USER : options.log_facility,
1141: !use_syslog);
1.375 dtucker 1142:
1143: if (debug_flag)
1.402 markus 1144: logit("%s, %s", SSH_VERSION,
1145: #ifdef WITH_OPENSSL
1.495 djm 1146: OpenSSL_version(OPENSSL_VERSION)
1.402 markus 1147: #else
1148: "without OpenSSL"
1149: #endif
1150: );
1.31 markus 1151:
1.400 djm 1152: /* Parse the configuration files */
1.496 djm 1153: process_config_files(host_arg, pw, 0, &want_final_pass);
1154: if (want_final_pass)
1155: debug("configuration requests final Match pass");
1.400 djm 1156:
1157: /* Hostname canonicalisation needs a few options filled. */
1158: fill_default_options_for_canonicalization(&options);
1159:
1160: /* If the user has replaced the hostname then take it into use now */
1161: if (options.hostname != NULL) {
1162: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1163: cp = percent_expand(options.hostname,
1164: "h", host, (char *)NULL);
1165: free(host);
1166: host = cp;
1.408 djm 1167: free(options.hostname);
1168: options.hostname = xstrdup(host);
1.400 djm 1169: }
1170:
1.470 djm 1171: /* Don't lowercase addresses, they will be explicitly canonicalised */
1172: if ((was_addr = is_addr(host)) == 0)
1173: lowercase(host);
1174:
1175: /*
1176: * Try to canonicalize if requested by configuration or the
1177: * hostname is an address.
1178: */
1179: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1180: addrs = resolve_canonicalize(&host, options.port);
1181:
1.139 markus 1182: /*
1.401 djm 1183: * If CanonicalizePermittedCNAMEs have been specified but
1184: * other canonicalization did not happen (by not being requested
1185: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1186: * as a result of CNAME following.
1.401 djm 1187: *
1188: * Try to resolve the bare hostname name using the system resolver's
1189: * usual search rules and then apply the CNAME follow rules.
1190: *
1191: * Skip the lookup if a ProxyCommand is being used unless the user
1192: * has specifically requested canonicalisation for this case via
1193: * CanonicalizeHostname=always
1.139 markus 1194: */
1.443 djm 1195: direct = option_clear_or_none(options.proxy_command) &&
1196: options.jump_host == NULL;
1197: if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1198: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1199: if ((addrs = resolve_host(host, options.port,
1.493 djm 1200: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1201: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1202: if (direct)
1.403 djm 1203: cleanup_exit(255); /* logged in resolve_host */
1204: } else
1.443 djm 1205: check_follow_cname(direct, &host, cname);
1.400 djm 1206: }
1.139 markus 1207:
1.400 djm 1208: /*
1.408 djm 1209: * If canonicalisation is enabled then re-parse the configuration
1210: * files as new stanzas may match.
1.400 djm 1211: */
1.496 djm 1212: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1213: debug("hostname canonicalisation enabled, "
1214: "will re-parse configuration");
1215: want_final_pass = 1;
1216: }
1217:
1218: if (want_final_pass) {
1219: debug("re-parsing configuration");
1.408 djm 1220: free(options.hostname);
1221: options.hostname = xstrdup(host);
1.496 djm 1222: process_config_files(host_arg, pw, 1, NULL);
1.408 djm 1223: /*
1224: * Address resolution happens early with canonicalisation
1225: * enabled and the port number may have changed since, so
1226: * reset it in address list
1227: */
1228: if (addrs != NULL && options.port > 0)
1229: set_addrinfo_port(addrs, options.port);
1.139 markus 1230: }
1.31 markus 1231:
1232: /* Fill configuration defaults. */
1233: fill_default_options(&options);
1.443 djm 1234:
1235: /*
1236: * If ProxyJump option specified, then construct a ProxyCommand now.
1237: */
1238: if (options.jump_host != NULL) {
1239: char port_s[8];
1.478 djm 1240: const char *sshbin = argv0;
1.520 dtucker 1241: int port = options.port, jumpport = options.jump_port;
1242:
1243: if (port <= 0)
1244: port = default_ssh_port();
1245: if (jumpport <= 0)
1246: jumpport = default_ssh_port();
1247: if (strcmp(options.jump_host, host) == 0 && port == jumpport)
1248: fatal("jumphost loop via %s", options.jump_host);
1.478 djm 1249:
1250: /*
1251: * Try to use SSH indicated by argv[0], but fall back to
1252: * "ssh" if it appears unavailable.
1253: */
1254: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1255: sshbin = "ssh";
1.443 djm 1256:
1257: /* Consistency check */
1258: if (options.proxy_command != NULL)
1259: fatal("inconsistent options: ProxyCommand+ProxyJump");
1260: /* Never use FD passing for ProxyJump */
1261: options.proxy_use_fdpass = 0;
1262: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1263: xasprintf(&options.proxy_command,
1.478 djm 1264: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1265: sshbin,
1.443 djm 1266: /* Optional "-l user" argument if jump_user set */
1267: options.jump_user == NULL ? "" : " -l ",
1268: options.jump_user == NULL ? "" : options.jump_user,
1269: /* Optional "-p port" argument if jump_port set */
1270: options.jump_port <= 0 ? "" : " -p ",
1271: options.jump_port <= 0 ? "" : port_s,
1272: /* Optional additional jump hosts ",..." */
1273: options.jump_extra == NULL ? "" : " -J ",
1274: options.jump_extra == NULL ? "" : options.jump_extra,
1275: /* Optional "-F" argumment if -F specified */
1276: config == NULL ? "" : " -F ",
1277: config == NULL ? "" : config,
1278: /* Optional "-v" arguments if -v set */
1279: debug_flag ? " -" : "",
1280: debug_flag, "vvv",
1281: /* Mandatory hostname */
1282: options.jump_host);
1283: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1284: options.proxy_command);
1285: }
1.31 markus 1286:
1.400 djm 1287: if (options.port == 0)
1288: options.port = default_ssh_port();
1.463 djm 1289: channel_set_af(ssh, options.address_family);
1.196 djm 1290:
1.383 djm 1291: /* Tidy and check options */
1292: if (options.host_key_alias != NULL)
1293: lowercase(options.host_key_alias);
1294: if (options.proxy_command != NULL &&
1295: strcmp(options.proxy_command, "-") == 0 &&
1296: options.proxy_use_fdpass)
1297: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.516 markus 1298: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1299: if (options.control_persist && options.control_path != NULL) {
1300: debug("UpdateHostKeys=ask is incompatible with "
1301: "ControlPersist; disabling");
1302: options.update_hostkeys = 0;
1303: } else if (sshbuf_len(command) != 0 ||
1304: options.remote_command != NULL ||
1305: options.request_tty == REQUEST_TTY_NO) {
1306: debug("UpdateHostKeys=ask is incompatible with "
1307: "remote command execution; disabling");
1.517 djm 1308: options.update_hostkeys = 0;
1309: } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1310: /* no point logging anything; user won't see it */
1.516 markus 1311: options.update_hostkeys = 0;
1312: }
1.415 djm 1313: }
1.430 djm 1314: if (options.connection_attempts <= 0)
1315: fatal("Invalid number of ConnectionAttempts");
1316:
1.482 markus 1317: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1318: fatal("Cannot execute command-line and remote command.");
1319:
1320: /* Cannot fork to background if no command. */
1.482 markus 1321: if (fork_after_authentication_flag && sshbuf_len(command) == 0 &&
1.461 bluhm 1322: options.remote_command == NULL && !no_shell_flag)
1323: fatal("Cannot fork into background without a command "
1324: "to execute.");
1325:
1.31 markus 1326: /* reinit */
1.452 dtucker 1327: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.370 djm 1328:
1329: if (options.request_tty == REQUEST_TTY_YES ||
1330: options.request_tty == REQUEST_TTY_FORCE)
1331: tty_flag = 1;
1332:
1333: /* Allocate a tty by default if no command specified. */
1.482 markus 1334: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1335: tty_flag = options.request_tty != REQUEST_TTY_NO;
1336:
1337: /* Force no tty */
1.447 markus 1338: if (options.request_tty == REQUEST_TTY_NO ||
1339: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
1.370 djm 1340: tty_flag = 0;
1341: /* Do not allocate a tty if stdin is not a tty. */
1342: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1343: options.request_tty != REQUEST_TTY_FORCE) {
1344: if (tty_flag)
1345: logit("Pseudo-terminal will not be allocated because "
1346: "stdin is not a terminal.");
1347: tty_flag = 0;
1348: }
1.31 markus 1349:
1350: if (options.user == NULL)
1351: options.user = xstrdup(pw->pw_name);
1.343 djm 1352:
1.466 djm 1353: /* Set up strings used to percent_expand() arguments */
1.358 djm 1354: if (gethostname(thishost, sizeof(thishost)) == -1)
1355: fatal("gethostname: %s", strerror(errno));
1356: strlcpy(shorthost, thishost, sizeof(shorthost));
1357: shorthost[strcspn(thishost, ".")] = '\0';
1358: snprintf(portstr, sizeof(portstr), "%d", options.port);
1.479 djm 1359: snprintf(uidstr, sizeof(uidstr), "%llu",
1360: (unsigned long long)pw->pw_uid);
1.358 djm 1361:
1.522 dtucker 1362: conn_hash_hex = ssh_connection_hash(thishost, host, portstr,
1363: options.user);
1.405 djm 1364:
1.466 djm 1365: /*
1366: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1367: * after port-forwarding is set up, so it may pick up any local
1368: * tunnel interface name allocated.
1369: */
1.461 bluhm 1370: if (options.remote_command != NULL) {
1371: debug3("expanding RemoteCommand: %s", options.remote_command);
1372: cp = options.remote_command;
1.527 dtucker 1373: options.remote_command = default_client_percent_expand(cp,
1374: pw->pw_dir, host, options.user, pw->pw_name);
1.461 bluhm 1375: debug3("expanded RemoteCommand: %s", options.remote_command);
1376: free(cp);
1.482 markus 1377: if ((r = sshbuf_put(command, options.remote_command,
1378: strlen(options.remote_command))) != 0)
1379: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.304 dtucker 1380: }
1.31 markus 1381:
1.214 djm 1382: if (options.control_path != NULL) {
1.490 dtucker 1383: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1384: free(options.control_path);
1.528 dtucker 1385: options.control_path = default_client_percent_dollar_expand(cp,
1.527 dtucker 1386: pw->pw_dir, host, options.user, pw->pw_name);
1.378 djm 1387: free(cp);
1.214 djm 1388: }
1.408 djm 1389:
1.522 dtucker 1390: if (options.identity_agent != NULL) {
1391: p = tilde_expand_filename(options.identity_agent, getuid());
1.528 dtucker 1392: cp = default_client_percent_dollar_expand(p,
1.527 dtucker 1393: pw->pw_dir, host, options.user, pw->pw_name);
1.522 dtucker 1394: free(p);
1395: free(options.identity_agent);
1396: options.identity_agent = cp;
1397: }
1398:
1399: if (options.forward_agent_sock_path != NULL) {
1400: p = tilde_expand_filename(options.forward_agent_sock_path,
1401: getuid());
1.528 dtucker 1402: cp = default_client_percent_dollar_expand(p,
1.527 dtucker 1403: pw->pw_dir, host, options.user, pw->pw_name);
1.522 dtucker 1404: free(p);
1405: free(options.forward_agent_sock_path);
1406: options.forward_agent_sock_path = cp;
1407: }
1408:
1.527 dtucker 1409: for (i = 0; i < options.num_local_forwards; i++) {
1410: if (options.local_forwards[i].listen_path != NULL) {
1411: cp = options.local_forwards[i].listen_path;
1412: p = options.local_forwards[i].listen_path =
1413: default_client_percent_expand(cp,
1414: pw->pw_dir, host, options.user, pw->pw_name);
1415: if (strcmp(cp, p) != 0)
1416: debug3("expanded LocalForward listen path "
1417: "'%s' -> '%s'", cp, p);
1418: free(cp);
1419: }
1420: if (options.local_forwards[i].connect_path != NULL) {
1421: cp = options.local_forwards[i].connect_path;
1422: p = options.local_forwards[i].connect_path =
1423: default_client_percent_expand(cp,
1424: pw->pw_dir, host, options.user, pw->pw_name);
1425: if (strcmp(cp, p) != 0)
1426: debug3("expanded LocalForward connect path "
1427: "'%s' -> '%s'", cp, p);
1428: free(cp);
1429: }
1430: }
1431:
1432: for (i = 0; i < options.num_remote_forwards; i++) {
1433: if (options.remote_forwards[i].listen_path != NULL) {
1434: cp = options.remote_forwards[i].listen_path;
1435: p = options.remote_forwards[i].listen_path =
1436: default_client_percent_expand(cp,
1437: pw->pw_dir, host, options.user, pw->pw_name);
1438: if (strcmp(cp, p) != 0)
1439: debug3("expanded RemoteForward listen path "
1440: "'%s' -> '%s'", cp, p);
1441: free(cp);
1442: }
1443: if (options.remote_forwards[i].connect_path != NULL) {
1444: cp = options.remote_forwards[i].connect_path;
1445: p = options.remote_forwards[i].connect_path =
1446: default_client_percent_expand(cp,
1447: pw->pw_dir, host, options.user, pw->pw_name);
1448: if (strcmp(cp, p) != 0)
1449: debug3("expanded RemoteForward connect path "
1450: "'%s' -> '%s'", cp, p);
1451: free(cp);
1452: }
1453: }
1454:
1.408 djm 1455: if (config_test) {
1456: dump_client_config(&options, host);
1457: exit(0);
1.508 djm 1458: }
1459:
1460: /* Expand SecurityKeyProvider if it refers to an environment variable */
1461: if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1462: strlen(options.sk_provider) > 1) {
1463: if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1.518 naddy 1464: debug("Authenticator provider %s did not resolve; "
1.508 djm 1465: "disabling", options.sk_provider);
1466: free(options.sk_provider);
1467: options.sk_provider = NULL;
1468: } else {
1469: debug2("resolved SecurityKeyProvider %s => %s",
1470: options.sk_provider, cp);
1471: free(options.sk_provider);
1472: options.sk_provider = xstrdup(cp);
1473: }
1.408 djm 1474: }
1.405 djm 1475:
1.312 djm 1476: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1477: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1478: if (options.control_path != NULL) {
1479: int sock;
1480: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1481: ssh_packet_set_connection(ssh, sock, sock);
1.499 djm 1482: ssh_packet_set_mux(ssh);
1.447 markus 1483: goto skip_connect;
1484: }
1485: }
1.401 djm 1486:
1487: /*
1488: * If hostname canonicalisation was not enabled, then we may not
1489: * have yet resolved the hostname. Do so now.
1490: */
1491: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1492: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1493: if ((addrs = resolve_host(host, options.port, 1,
1494: cname, sizeof(cname))) == NULL)
1495: cleanup_exit(255); /* resolve_host logs the error */
1496: }
1.214 djm 1497:
1.303 djm 1498: timeout_ms = options.connection_timeout * 1000;
1499:
1.77 markus 1500: /* Open a connection to the remote host. */
1.511 beck 1501: if (ssh_connect(ssh, host, host_arg, addrs, &hostaddr, options.port,
1.385 djm 1502: options.address_family, options.connection_attempts,
1.488 dtucker 1503: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1504: exit(255);
1.31 markus 1505:
1.391 djm 1506: if (addrs != NULL)
1507: freeaddrinfo(addrs);
1508:
1.499 djm 1509: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1510: options.server_alive_count_max);
1511:
1.303 djm 1512: if (timeout_ms > 0)
1513: debug3("timeout: %d ms remain after connect", timeout_ms);
1514:
1.33 markus 1515: /*
1.485 dtucker 1516: * If we successfully made the connection and we have hostbased auth
1517: * enabled, load the public keys so we can later use the ssh-keysign
1518: * helper to sign challenges.
1.33 markus 1519: */
1.112 markus 1520: sensitive_data.nkeys = 0;
1521: sensitive_data.keys = NULL;
1.457 djm 1522: if (options.hostbased_authentication) {
1.486 dtucker 1523: sensitive_data.nkeys = 10;
1.274 deraadt 1524: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.483 markus 1525: sizeof(struct sshkey));
1526:
1527: /* XXX check errors? */
1.486 dtucker 1528: #define L_PUBKEY(p,o) do { \
1529: if ((o) >= sensitive_data.nkeys) \
1530: fatal("%s pubkey out of array bounds", __func__); \
1.483 markus 1531: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.486 dtucker 1532: p, "pubkey"); \
1533: } while (0)
1534: #define L_CERT(p,o) do { \
1535: if ((o) >= sensitive_data.nkeys) \
1536: fatal("%s cert out of array bounds", __func__); \
1537: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), p, "cert"); \
1538: } while (0)
1.177 markus 1539:
1.485 dtucker 1540: if (options.hostbased_authentication == 1) {
1.486 dtucker 1541: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1542: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1543: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1544: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1545: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1546: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1547: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1548: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1549: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1550: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.173 markus 1551: }
1.31 markus 1552: }
1553:
1.487 dtucker 1554: /* Create ~/.ssh * directory if it doesn't already exist. */
1.367 djm 1555: if (config == NULL) {
1556: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1557: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.505 deraadt 1558: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) == -1)
1559: if (mkdir(buf, 0700) == -1)
1.367 djm 1560: error("Could not create directory '%.200s'.",
1561: buf);
1562: }
1.31 markus 1563:
1.104 markus 1564: /* load options.identity_files */
1.466 djm 1565: load_public_identity_files(pw);
1.439 markus 1566:
1.476 djm 1567: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1568: if (options.identity_agent &&
1569: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1570: if (strcmp(options.identity_agent, "none") == 0) {
1571: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1572: } else {
1.522 dtucker 1573: cp = options.identity_agent;
1.528 dtucker 1574: /* legacy (limited) format */
1575: if (cp[0] == '$' && cp[1] != '{') {
1.494 djm 1576: if (!valid_env_name(cp + 1)) {
1577: fatal("Invalid IdentityAgent "
1578: "environment variable name %s", cp);
1579: }
1580: if ((p = getenv(cp + 1)) == NULL)
1581: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1582: else
1583: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1584: } else {
1585: /* identity_agent specifies a path directly */
1586: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1587: }
1.510 djm 1588: }
1589: }
1590:
1.522 dtucker 1591: if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1.526 djm 1592: cp = options.forward_agent_sock_path;
1.510 djm 1593: if (cp[0] == '$') {
1594: if (!valid_env_name(cp + 1)) {
1595: fatal("Invalid ForwardAgent environment variable name %s", cp);
1596: }
1597: if ((p = getenv(cp + 1)) != NULL)
1598: forward_agent_sock_path = p;
1599: else
1600: options.forward_agent = 0;
1601: free(cp);
1602: } else {
1603: forward_agent_sock_path = cp;
1.439 markus 1604: }
1605: }
1.104 markus 1606:
1607: /* Expand ~ in known host file names. */
1.361 djm 1608: tilde_expand_paths(options.system_hostfiles,
1609: options.num_system_hostfiles);
1610: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1611:
1.512 dtucker 1612: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1613: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1614:
1.316 djm 1615: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1616: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1617: options.port, pw, timeout_ms);
1.339 djm 1618:
1.499 djm 1619: if (ssh_packet_connection_is_on_socket(ssh)) {
1.339 djm 1620: verbose("Authenticated to %s ([%s]:%d).", host,
1.437 djm 1621: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
1.339 djm 1622: } else {
1623: verbose("Authenticated to %s (via proxy).", host);
1624: }
1.31 markus 1625:
1.112 markus 1626: /* We no longer need the private host keys. Clear them now. */
1627: if (sensitive_data.nkeys != 0) {
1628: for (i = 0; i < sensitive_data.nkeys; i++) {
1629: if (sensitive_data.keys[i] != NULL) {
1630: /* Destroys contents safely */
1631: debug3("clear hostkey %d", i);
1.483 markus 1632: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1633: sensitive_data.keys[i] = NULL;
1634: }
1635: }
1.378 djm 1636: free(sensitive_data.keys);
1.134 markus 1637: }
1638: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1639: free(options.identity_files[i]);
1640: options.identity_files[i] = NULL;
1.134 markus 1641: if (options.identity_keys[i]) {
1.483 markus 1642: sshkey_free(options.identity_keys[i]);
1.134 markus 1643: options.identity_keys[i] = NULL;
1644: }
1.112 markus 1645: }
1.426 djm 1646: for (i = 0; i < options.num_certificate_files; i++) {
1647: free(options.certificate_files[i]);
1648: options.certificate_files[i] = NULL;
1649: }
1.31 markus 1650:
1.447 markus 1651: skip_connect:
1.466 djm 1652: exit_status = ssh_session2(ssh, pw);
1.499 djm 1653: ssh_packet_close(ssh);
1.186 djm 1654:
1.312 djm 1655: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1656: unlink(options.control_path);
1657:
1.353 djm 1658: /* Kill ProxyCommand if it is running. */
1659: ssh_kill_proxy_command();
1.186 djm 1660:
1.45 markus 1661: return exit_status;
1662: }
1663:
1.344 djm 1664: static void
1665: control_persist_detach(void)
1666: {
1667: pid_t pid;
1.438 djm 1668: int devnull, keep_stderr;
1.344 djm 1669:
1670: debug("%s: backgrounding master process", __func__);
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:
1678: fatal("%s: fork: %s", __func__, strerror(errno));
1679: case 0:
1680: /* Child: master process continues mainloop */
1.473 djm 1681: break;
1682: default:
1.344 djm 1683: /* Parent: set up mux slave to connect to backgrounded master */
1684: debug2("%s: background process is %ld", __func__, (long)pid);
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: }
1.346 djm 1695: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1696: error("%s: open(\"/dev/null\"): %s", __func__,
1697: strerror(errno));
1698: } else {
1.438 djm 1699: keep_stderr = log_is_on_stderr() && debug_flag;
1.346 djm 1700: if (dup2(devnull, STDIN_FILENO) == -1 ||
1.438 djm 1701: dup2(devnull, STDOUT_FILENO) == -1 ||
1702: (!keep_stderr && dup2(devnull, STDERR_FILENO) == -1))
1.346 djm 1703: error("%s: dup2: %s", __func__, strerror(errno));
1704: if (devnull > STDERR_FILENO)
1705: close(devnull);
1706: }
1.381 djm 1707: daemon(1, 1);
1.362 djm 1708: setproctitle("%s [mux]", options.control_path);
1.344 djm 1709: }
1710:
1711: /* Do fork() after authentication. Used by "ssh -f" */
1712: static void
1713: fork_postauth(void)
1714: {
1715: if (need_controlpersist_detach)
1716: control_persist_detach();
1717: debug("forking to background");
1718: fork_after_authentication_flag = 0;
1.505 deraadt 1719: if (daemon(1, 1) == -1)
1.344 djm 1720: fatal("daemon() failed: %.200s", strerror(errno));
1721: }
1722:
1.523 djm 1723: static void
1724: forwarding_success(void)
1725: {
1.524 djm 1726: if (forward_confirms_pending == -1)
1727: return;
1728: if (--forward_confirms_pending == 0) {
1.525 djm 1729: debug("%s: all expected forwarding replies received", __func__);
1.523 djm 1730: if (fork_after_authentication_flag)
1731: fork_postauth();
1.524 djm 1732: } else {
1733: debug2("%s: %d expected forwarding replies remaining",
1734: __func__, forward_confirms_pending);
1.523 djm 1735: }
1736: }
1737:
1.315 djm 1738: /* Callback for remote forward global requests */
1739: static void
1.463 djm 1740: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1741: {
1.406 millert 1742: struct Forward *rfwd = (struct Forward *)ctxt;
1.499 djm 1743: u_int port;
1744: int r;
1.315 djm 1745:
1.324 djm 1746: /* XXX verbose() on failure? */
1.404 markus 1747: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1748: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1749: rfwd->listen_path ? rfwd->listen_path :
1750: rfwd->listen_host ? rfwd->listen_host : "",
1751: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1752: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1753: rfwd->connect_host, rfwd->connect_port);
1754: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1755: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1.499 djm 1756: if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1757: fatal("%s: %s", __func__, ssh_err(r));
1758: if (port > 65535) {
1759: error("Invalid allocated port %u for remote "
1760: "forward to %s:%d", port,
1761: rfwd->connect_host, rfwd->connect_port);
1762: /* Ensure failure processing runs below */
1763: type = SSH2_MSG_REQUEST_FAILURE;
1764: channel_update_permission(ssh,
1765: rfwd->handle, -1);
1766: } else {
1767: rfwd->allocated_port = (int)port;
1768: logit("Allocated port %u for remote "
1769: "forward to %s:%d",
1770: rfwd->allocated_port, rfwd->connect_host,
1771: rfwd->connect_port);
1772: channel_update_permission(ssh,
1773: rfwd->handle, rfwd->allocated_port);
1774: }
1.366 markus 1775: } else {
1.480 djm 1776: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1777: }
1.324 djm 1778: }
1.468 djm 1779:
1.315 djm 1780: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1781: if (options.exit_on_forward_failure) {
1782: if (rfwd->listen_path != NULL)
1783: fatal("Error: remote port forwarding failed "
1784: "for listen path %s", rfwd->listen_path);
1785: else
1786: fatal("Error: remote port forwarding failed "
1787: "for listen port %d", rfwd->listen_port);
1788: } else {
1789: if (rfwd->listen_path != NULL)
1790: logit("Warning: remote port forwarding failed "
1791: "for listen path %s", rfwd->listen_path);
1792: else
1793: logit("Warning: remote port forwarding failed "
1794: "for listen port %d", rfwd->listen_port);
1795: }
1.315 djm 1796: }
1.523 djm 1797: forwarding_success();
1.315 djm 1798: }
1799:
1.126 itojun 1800: static void
1.463 djm 1801: client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
1.331 dtucker 1802: {
1803: debug("stdio forwarding: done");
1804: cleanup_exit(0);
1805: }
1806:
1.368 djm 1807: static void
1.463 djm 1808: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1809: {
1810: if (!success)
1811: fatal("stdio forwarding failed");
1812: }
1813:
1814: static void
1.523 djm 1815: ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
1816: {
1817: if (!success) {
1818: error("Tunnel forwarding failed");
1819: if (options.exit_on_forward_failure)
1820: cleanup_exit(255);
1821: }
1822:
1823: debug("%s: tunnel forward established, id=%d", __func__, id);
1824: forwarding_success();
1825: }
1826:
1827: static void
1.463 djm 1828: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1829: {
1830: Channel *c;
1.332 djm 1831: int in, out;
1.331 dtucker 1832:
1.441 dtucker 1833: if (options.stdio_forward_host == NULL)
1.368 djm 1834: return;
1835:
1.441 dtucker 1836: debug3("%s: %s:%d", __func__, options.stdio_forward_host,
1837: options.stdio_forward_port);
1.332 djm 1838:
1.505 deraadt 1839: if ((in = dup(STDIN_FILENO)) == -1 ||
1840: (out = dup(STDOUT_FILENO)) == -1)
1.332 djm 1841: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.463 djm 1842: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.441 dtucker 1843: options.stdio_forward_port, in, out)) == NULL)
1.368 djm 1844: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.463 djm 1845: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1846: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1847: }
1848:
1849: static void
1.466 djm 1850: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1851: {
1.86 markus 1852: int success = 0;
1.70 markus 1853: int i;
1.331 dtucker 1854:
1.524 djm 1855: if (options.exit_on_forward_failure)
1856: forward_confirms_pending = 0; /* track pending requests */
1.70 markus 1857: /* Initiate local TCP/IP port forwardings. */
1858: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1859: debug("Local connections to %.200s:%d forwarded to remote "
1860: "address %.200s:%d",
1.406 millert 1861: (options.local_forwards[i].listen_path != NULL) ?
1862: options.local_forwards[i].listen_path :
1.234 deraadt 1863: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1864: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1865: options.local_forwards[i].listen_host,
1866: options.local_forwards[i].listen_port,
1.406 millert 1867: (options.local_forwards[i].connect_path != NULL) ?
1868: options.local_forwards[i].connect_path :
1.232 djm 1869: options.local_forwards[i].connect_host,
1870: options.local_forwards[i].connect_port);
1.463 djm 1871: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1872: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1873: }
1.283 markus 1874: if (i > 0 && success != i && options.exit_on_forward_failure)
1875: fatal("Could not request local forwarding.");
1.86 markus 1876: if (i > 0 && success == 0)
1877: error("Could not request local forwarding.");
1.70 markus 1878:
1879: /* Initiate remote TCP/IP port forwardings. */
1880: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1881: debug("Remote connections from %.200s:%d forwarded to "
1882: "local address %.200s:%d",
1.406 millert 1883: (options.remote_forwards[i].listen_path != NULL) ?
1884: options.remote_forwards[i].listen_path :
1.248 djm 1885: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1886: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1887: options.remote_forwards[i].listen_port,
1.406 millert 1888: (options.remote_forwards[i].connect_path != NULL) ?
1889: options.remote_forwards[i].connect_path :
1.232 djm 1890: options.remote_forwards[i].connect_host,
1891: options.remote_forwards[i].connect_port);
1.523 djm 1892: if ((options.remote_forwards[i].handle =
1.463 djm 1893: channel_request_remote_forwarding(ssh,
1.523 djm 1894: &options.remote_forwards[i])) >= 0) {
1.463 djm 1895: client_register_global_confirm(
1896: ssh_confirm_remote_forward,
1.366 markus 1897: &options.remote_forwards[i]);
1.523 djm 1898: forward_confirms_pending++;
1899: } else if (options.exit_on_forward_failure)
1900: fatal("Could not request remote forwarding.");
1901: else
1902: logit("Warning: Could not request remote forwarding.");
1.70 markus 1903: }
1.301 djm 1904:
1905: /* Initiate tunnel forwarding. */
1906: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1907: if ((*ifname = client_request_tun_fwd(ssh,
1908: options.tun_open, options.tun_local,
1.523 djm 1909: options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
1910: forward_confirms_pending++;
1911: else if (options.exit_on_forward_failure)
1912: fatal("Could not request tunnel forwarding.");
1913: else
1914: error("Could not request tunnel forwarding.");
1.524 djm 1915: }
1916: if (forward_confirms_pending > 0) {
1917: debug("%s: expecting replies for %d forwards", __func__,
1918: forward_confirms_pending);
1.468 djm 1919: }
1.70 markus 1920: }
1921:
1.126 itojun 1922: static void
1.70 markus 1923: check_agent_present(void)
1924: {
1.412 djm 1925: int r;
1926:
1.70 markus 1927: if (options.forward_agent) {
1.254 djm 1928: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1929: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1930: options.forward_agent = 0;
1.412 djm 1931: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1932: debug("ssh_get_authentication_socket: %s",
1933: ssh_err(r));
1934: }
1.70 markus 1935: }
1936: }
1937:
1.214 djm 1938: static void
1.463 djm 1939: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 1940: {
1.215 djm 1941: extern char **environ;
1.243 djm 1942: const char *display;
1.499 djm 1943: int r, interactive = tty_flag;
1.433 djm 1944: char *proto = NULL, *data = NULL;
1.337 djm 1945:
1946: if (!success)
1947: return; /* No need for error message, channels code sens one */
1.215 djm 1948:
1.248 djm 1949: display = getenv("DISPLAY");
1.417 djm 1950: if (display == NULL && options.forward_x11)
1951: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 1952: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 1953: options.xauth_location, options.forward_x11_trusted,
1954: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 1955: /* Request forwarding with authentication spoofing. */
1.316 djm 1956: debug("Requesting X11 forwarding with authentication "
1957: "spoofing.");
1.463 djm 1958: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 1959: data, 1);
1.463 djm 1960: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 1961: /* XXX exit_on_forward_failure */
1.80 markus 1962: interactive = 1;
1.50 markus 1963: }
1964:
1.70 markus 1965: check_agent_present();
1966: if (options.forward_agent) {
1967: debug("Requesting authentication agent forwarding.");
1.463 djm 1968: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 1969: if ((r = sshpkt_send(ssh)) != 0)
1970: fatal("%s: %s", __func__, ssh_err(r));
1.212 djm 1971: }
1.369 dtucker 1972:
1973: /* Tell the packet module whether this is an interactive session. */
1.499 djm 1974: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 1975: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1976:
1.463 djm 1977: client_session2_setup(ssh, id, tty_flag, subsystem_flag, getenv("TERM"),
1.482 markus 1978: NULL, fileno(stdin), command, environ);
1.45 markus 1979: }
1980:
1.143 markus 1981: /* open new channel for a session */
1.126 itojun 1982: static int
1.463 djm 1983: ssh_session2_open(struct ssh *ssh)
1.45 markus 1984: {
1.118 markus 1985: Channel *c;
1986: int window, packetmax, in, out, err;
1.60 markus 1987:
1.62 markus 1988: if (stdin_null_flag) {
1.93 itojun 1989: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1990: } else {
1991: in = dup(STDIN_FILENO);
1992: }
1.60 markus 1993: out = dup(STDOUT_FILENO);
1994: err = dup(STDERR_FILENO);
1.45 markus 1995:
1.505 deraadt 1996: if (in == -1 || out == -1 || err == -1)
1.62 markus 1997: fatal("dup() in/out/err failed");
1.45 markus 1998:
1.69 markus 1999: /* enable nonblocking unless tty */
2000: if (!isatty(in))
2001: set_nonblock(in);
2002: if (!isatty(out))
2003: set_nonblock(out);
2004: if (!isatty(err))
2005: set_nonblock(err);
2006:
1.65 markus 2007: window = CHAN_SES_WINDOW_DEFAULT;
2008: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 2009: if (tty_flag) {
2010: window >>= 1;
2011: packetmax >>= 1;
1.45 markus 2012: }
1.463 djm 2013: c = channel_new(ssh,
1.45 markus 2014: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 2015: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 2016: "client-session", /*nonblock*/0);
1.45 markus 2017:
1.463 djm 2018: debug3("%s: channel_new: %d", __func__, c->self);
1.106 markus 2019:
1.463 djm 2020: channel_send_open(ssh, c->self);
1.143 markus 2021: if (!no_shell_flag)
1.463 djm 2022: channel_register_open_confirm(ssh, c->self,
1.310 djm 2023: ssh_session2_setup, NULL);
1.106 markus 2024:
1.118 markus 2025: return c->self;
1.106 markus 2026: }
2027:
1.126 itojun 2028: static int
1.466 djm 2029: ssh_session2(struct ssh *ssh, struct passwd *pw)
1.106 markus 2030: {
1.499 djm 2031: int r, devnull, id = -1;
1.466 djm 2032: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 2033:
2034: /* XXX should be pre-session */
1.368 djm 2035: if (!options.control_persist)
1.463 djm 2036: ssh_init_stdio_forwarding(ssh);
1.466 djm 2037:
2038: ssh_init_forwarding(ssh, &tun_fwd_ifname);
2039:
2040: if (options.local_command != NULL) {
2041: debug3("expanding LocalCommand: %s", options.local_command);
2042: cp = options.local_command;
2043: options.local_command = percent_expand(cp,
1.522 dtucker 2044: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS,
1.466 djm 2045: "d", pw->pw_dir,
2046: "h", host,
2047: "r", options.user,
2048: "u", pw->pw_name,
2049: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2050: (char *)NULL);
2051: debug3("expanded LocalCommand: %s", options.local_command);
2052: free(cp);
2053: }
1.106 markus 2054:
1.344 djm 2055: /* Start listening for multiplex clients */
1.499 djm 2056: if (!ssh_packet_get_mux(ssh))
1.463 djm 2057: muxserver_listen(ssh);
1.344 djm 2058:
1.473 djm 2059: /*
1.368 djm 2060: * If we are in control persist mode and have a working mux listen
2061: * socket, then prepare to background ourselves and have a foreground
2062: * client attach as a control slave.
2063: * NB. we must save copies of the flags that we override for
1.344 djm 2064: * the backgrounding, since we defer attachment of the slave until
2065: * after the connection is fully established (in particular,
2066: * async rfwd replies have been received for ExitOnForwardFailure).
2067: */
1.473 djm 2068: if (options.control_persist && muxserver_sock != -1) {
1.344 djm 2069: ostdin_null_flag = stdin_null_flag;
2070: ono_shell_flag = no_shell_flag;
1.359 djm 2071: orequest_tty = options.request_tty;
1.344 djm 2072: otty_flag = tty_flag;
1.473 djm 2073: stdin_null_flag = 1;
2074: no_shell_flag = 1;
2075: tty_flag = 0;
1.344 djm 2076: if (!fork_after_authentication_flag)
2077: need_controlpersist_detach = 1;
2078: fork_after_authentication_flag = 1;
1.473 djm 2079: }
1.368 djm 2080: /*
2081: * ControlPersist mux listen socket setup failed, attempt the
2082: * stdio forward setup that we skipped earlier.
2083: */
2084: if (options.control_persist && muxserver_sock == -1)
1.463 djm 2085: ssh_init_stdio_forwarding(ssh);
1.344 djm 2086:
1.471 djm 2087: if (!no_shell_flag)
1.463 djm 2088: id = ssh_session2_open(ssh);
1.379 djm 2089: else {
1.499 djm 2090: ssh_packet_set_interactive(ssh,
1.379 djm 2091: options.control_master == SSHCTL_MASTER_NO,
2092: options.ip_qos_interactive, options.ip_qos_bulk);
2093: }
1.314 djm 2094:
2095: /* If we don't expect to open a new session, then disallow it */
1.319 markus 2096: if (options.control_master == SSHCTL_MASTER_NO &&
2097: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 2098: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 2099: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2100: (r = sshpkt_put_cstring(ssh,
2101: "no-more-sessions@openssh.com")) != 0 ||
2102: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2103: (r = sshpkt_send(ssh)) != 0)
2104: fatal("%s: %s", __func__, ssh_err(r));
1.314 djm 2105: }
1.255 reyk 2106:
2107: /* Execute a local command */
2108: if (options.local_command != NULL &&
2109: options.permit_local_command)
2110: ssh_local_cmd(options.local_command);
1.467 djm 2111:
2112: /*
2113: * stdout is now owned by the session channel; clobber it here
2114: * so future channel closes are propagated to the local fd.
2115: * NB. this can only happen after LocalCommand has completed,
2116: * as it may want to write to stdout.
2117: */
1.469 djm 2118: if (!need_controlpersist_detach) {
2119: if ((devnull = open(_PATH_DEVNULL, O_WRONLY)) == -1)
2120: error("%s: open %s: %s", __func__,
2121: _PATH_DEVNULL, strerror(errno));
1.505 deraadt 2122: if (dup2(devnull, STDOUT_FILENO) == -1)
1.469 djm 2123: fatal("%s: dup2() stdout failed", __func__);
2124: if (devnull > STDERR_FILENO)
2125: close(devnull);
2126: }
1.301 djm 2127:
1.342 djm 2128: /*
2129: * If requested and we are not interested in replies to remote
2130: * forwarding requests, then let ssh continue in the background.
2131: */
1.344 djm 2132: if (fork_after_authentication_flag) {
2133: if (options.exit_on_forward_failure &&
2134: options.num_remote_forwards > 0) {
2135: debug("deferring postauth fork until remote forward "
2136: "confirmation received");
2137: } else
2138: fork_postauth();
1.318 djm 2139: }
1.31 markus 2140:
1.463 djm 2141: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2142: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2143: }
2144:
1.426 djm 2145: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2146: static void
1.466 djm 2147: load_public_identity_files(struct passwd *pw)
1.104 markus 2148: {
1.466 djm 2149: char *filename, *cp;
1.460 markus 2150: struct sshkey *public;
1.426 djm 2151: int i;
2152: u_int n_ids, n_certs;
1.335 djm 2153: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2154: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2155: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2156: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2157: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2158: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2159: #ifdef ENABLE_PKCS11
1.514 djm 2160: struct sshkey **keys = NULL;
2161: char **comments = NULL;
1.333 markus 2162: int nkeys;
1.335 djm 2163: #endif /* PKCS11 */
1.104 markus 2164:
1.426 djm 2165: n_ids = n_certs = 0;
1.398 tedu 2166: memset(identity_files, 0, sizeof(identity_files));
2167: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2168: memset(identity_file_userprovided, 0,
2169: sizeof(identity_file_userprovided));
1.426 djm 2170: memset(certificate_files, 0, sizeof(certificate_files));
2171: memset(certificates, 0, sizeof(certificates));
1.484 djm 2172: memset(certificate_file_userprovided, 0,
2173: sizeof(certificate_file_userprovided));
1.335 djm 2174:
2175: #ifdef ENABLE_PKCS11
1.333 markus 2176: if (options.pkcs11_provider != NULL &&
1.167 markus 2177: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2178: (pkcs11_init(!options.batch_mode) == 0) &&
2179: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1.514 djm 2180: &keys, &comments)) > 0) {
1.333 markus 2181: for (i = 0; i < nkeys; i++) {
1.335 djm 2182: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2183: sshkey_free(keys[i]);
1.514 djm 2184: free(comments[i]);
1.335 djm 2185: continue;
2186: }
2187: identity_keys[n_ids] = keys[i];
1.514 djm 2188: identity_files[n_ids] = comments[i]; /* transferred */
1.335 djm 2189: n_ids++;
1.167 markus 2190: }
1.378 djm 2191: free(keys);
1.514 djm 2192: free(comments);
1.127 markus 2193: }
1.333 markus 2194: #endif /* ENABLE_PKCS11 */
1.335 djm 2195: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2196: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2197: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2198: free(options.identity_files[i]);
1.426 djm 2199: options.identity_files[i] = NULL;
1.335 djm 2200: continue;
2201: }
1.490 dtucker 2202: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.528 dtucker 2203: filename = default_client_percent_dollar_expand(cp,
1.527 dtucker 2204: pw->pw_dir, host, options.user, pw->pw_name);
1.378 djm 2205: free(cp);
1.483 markus 2206: check_load(sshkey_load_public(filename, &public, NULL),
2207: filename, "pubkey");
1.131 millert 2208: debug("identity file %s type %d", filename,
2209: public ? public->type : -1);
1.378 djm 2210: free(options.identity_files[i]);
1.335 djm 2211: identity_files[n_ids] = filename;
2212: identity_keys[n_ids] = public;
1.484 djm 2213: identity_file_userprovided[n_ids] =
2214: options.identity_file_userprovided[i];
1.335 djm 2215: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2216: continue;
2217:
1.426 djm 2218: /*
2219: * If no certificates have been explicitly listed then try
2220: * to add the default certificate variant too.
2221: */
2222: if (options.num_certificate_files != 0)
2223: continue;
1.335 djm 2224: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2225: check_load(sshkey_load_public(cp, &public, NULL),
2226: filename, "pubkey");
1.335 djm 2227: debug("identity file %s type %d", cp,
2228: public ? public->type : -1);
2229: if (public == NULL) {
1.378 djm 2230: free(cp);
1.335 djm 2231: continue;
2232: }
1.483 markus 2233: if (!sshkey_is_cert(public)) {
1.335 djm 2234: debug("%s: key %s type %s is not a certificate",
1.483 markus 2235: __func__, cp, sshkey_type(public));
2236: sshkey_free(public);
1.378 djm 2237: free(cp);
1.335 djm 2238: continue;
2239: }
1.448 djm 2240: /* NB. leave filename pointing to private key */
2241: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2242: identity_keys[n_ids] = public;
1.484 djm 2243: identity_file_userprovided[n_ids] =
2244: options.identity_file_userprovided[i];
1.335 djm 2245: n_ids++;
2246: }
1.426 djm 2247:
2248: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
2249: fatal("%s: too many certificates", __func__);
2250: for (i = 0; i < options.num_certificate_files; i++) {
2251: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2252: getuid());
1.528 dtucker 2253: filename = default_client_percent_dollar_expand(cp,
1.527 dtucker 2254: pw->pw_dir, host, options.user, pw->pw_name);
1.426 djm 2255: free(cp);
2256:
1.483 markus 2257: check_load(sshkey_load_public(filename, &public, NULL),
2258: filename, "certificate");
1.426 djm 2259: debug("certificate file %s type %d", filename,
2260: public ? public->type : -1);
2261: free(options.certificate_files[i]);
2262: options.certificate_files[i] = NULL;
2263: if (public == NULL) {
2264: free(filename);
2265: continue;
2266: }
1.483 markus 2267: if (!sshkey_is_cert(public)) {
1.426 djm 2268: debug("%s: key %s type %s is not a certificate",
1.483 markus 2269: __func__, filename, sshkey_type(public));
2270: sshkey_free(public);
1.426 djm 2271: free(filename);
2272: continue;
2273: }
2274: certificate_files[n_certs] = filename;
2275: certificates[n_certs] = public;
1.484 djm 2276: certificate_file_userprovided[n_certs] =
2277: options.certificate_file_userprovided[i];
1.426 djm 2278: ++n_certs;
2279: }
2280:
1.335 djm 2281: options.num_identity_files = n_ids;
2282: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2283: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2284: memcpy(options.identity_file_userprovided,
2285: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2286:
2287: options.num_certificate_files = n_certs;
2288: memcpy(options.certificate_files,
2289: certificate_files, sizeof(certificate_files));
2290: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2291: memcpy(options.certificate_file_userprovided,
2292: certificate_file_userprovided,
2293: sizeof(certificate_file_userprovided));
1.214 djm 2294: }
1.352 djm 2295:
2296: static void
2297: main_sigchld_handler(int sig)
2298: {
2299: int save_errno = errno;
2300: pid_t pid;
2301: int status;
2302:
2303: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2304: (pid == -1 && errno == EINTR))
1.352 djm 2305: ;
2306: errno = save_errno;
2307: }
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