Annotation of src/usr.bin/ssh/ssh.c, Revision 1.540
1.540 ! djm 1: /* $OpenBSD: ssh.c,v 1.539 2020/10/16 13:26:13 djm Exp $ */
1.1 deraadt 2: /*
1.32 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * Ssh client program. This program can be used to log into a remote machine.
7: * The software supports strong authentication, encryption, and forwarding
8: * of X11, TCP/IP, and authentication connections.
9: *
1.64 deraadt 10: * As far as I am concerned, the code I have written for this software
11: * can be used freely for any purpose. Any derived versions of this
12: * software must be clearly marked as such, and if the derived work is
13: * incompatible with the protocol description in the RFC file, it must be
14: * called by a name other than "ssh" or "Secure Shell".
15: *
16: * Copyright (c) 1999 Niels Provos. All rights reserved.
1.202 markus 17: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 18: *
1.529 dtucker 19: * Modified to work with SSLeay by Niels Provos <provos@citi.umich.edu>
1.64 deraadt 20: * in Canada (German citizen).
21: *
22: * Redistribution and use in source and binary forms, with or without
23: * modification, are permitted provided that the following conditions
24: * are met:
25: * 1. Redistributions of source code must retain the above copyright
26: * notice, this list of conditions and the following disclaimer.
27: * 2. Redistributions in binary form must reproduce the above copyright
28: * notice, this list of conditions and the following disclaimer in the
29: * documentation and/or other materials provided with the distribution.
30: *
31: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 41: */
1.1 deraadt 42:
1.293 deraadt 43: #include <sys/types.h>
1.312 djm 44: #include <sys/ioctl.h>
45: #include <sys/queue.h>
1.259 stevesk 46: #include <sys/resource.h>
1.280 stevesk 47: #include <sys/socket.h>
1.264 stevesk 48: #include <sys/stat.h>
1.312 djm 49: #include <sys/time.h>
1.352 djm 50: #include <sys/wait.h>
1.258 stevesk 51:
1.265 stevesk 52: #include <ctype.h>
1.285 stevesk 53: #include <errno.h>
1.281 stevesk 54: #include <fcntl.h>
1.286 stevesk 55: #include <netdb.h>
1.258 stevesk 56: #include <paths.h>
1.279 stevesk 57: #include <pwd.h>
1.263 stevesk 58: #include <signal.h>
1.287 stevesk 59: #include <stddef.h>
1.291 stevesk 60: #include <stdio.h>
1.290 stevesk 61: #include <stdlib.h>
1.289 stevesk 62: #include <string.h>
1.509 naddy 63: #include <stdarg.h>
1.288 stevesk 64: #include <unistd.h>
1.414 deraadt 65: #include <limits.h>
1.445 djm 66: #include <locale.h>
1.49 markus 67:
1.402 markus 68: #ifdef WITH_OPENSSL
1.49 markus 69: #include <openssl/evp.h>
1.72 markus 70: #include <openssl/err.h>
1.402 markus 71: #endif
1.1 deraadt 72:
1.293 deraadt 73: #include "xmalloc.h"
1.84 markus 74: #include "ssh.h"
75: #include "ssh2.h"
1.341 djm 76: #include "canohost.h"
1.84 markus 77: #include "compat.h"
78: #include "cipher.h"
1.1 deraadt 79: #include "packet.h"
1.482 markus 80: #include "sshbuf.h"
1.123 markus 81: #include "channels.h"
1.483 markus 82: #include "sshkey.h"
1.58 markus 83: #include "authfd.h"
1.49 markus 84: #include "authfile.h"
1.83 markus 85: #include "pathnames.h"
1.214 djm 86: #include "dispatch.h"
1.81 markus 87: #include "clientloop.h"
1.84 markus 88: #include "log.h"
1.406 millert 89: #include "misc.h"
1.84 markus 90: #include "readconf.h"
91: #include "sshconnect.h"
1.95 markus 92: #include "kex.h"
93: #include "mac.h"
1.213 deraadt 94: #include "sshpty.h"
1.212 djm 95: #include "match.h"
1.214 djm 96: #include "msg.h"
1.278 stevesk 97: #include "version.h"
1.412 djm 98: #include "ssherr.h"
1.420 djm 99: #include "myproposal.h"
1.49 markus 100:
1.333 markus 101: #ifdef ENABLE_PKCS11
102: #include "ssh-pkcs11.h"
1.137 jakob 103: #endif
1.498 djm 104:
1.49 markus 105: extern char *__progname;
1.1 deraadt 106:
1.316 djm 107: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 108: int debug_flag = 0;
109:
1.359 djm 110: /* Flag indicating whether a tty should be requested */
1.1 deraadt 111: int tty_flag = 0;
112:
1.45 markus 113: /* don't exec a shell */
114: int no_shell_flag = 0;
115:
1.33 markus 116: /*
117: * Flag indicating that nothing should be read from stdin. This can be set
118: * on the command line.
119: */
1.1 deraadt 120: int stdin_null_flag = 0;
121:
1.33 markus 122: /*
1.344 djm 123: * Flag indicating that the current process should be backgrounded and
1.531 djm 124: * a new mux-client launched in the foreground for ControlPersist.
1.344 djm 125: */
126: int need_controlpersist_detach = 0;
127:
1.531 djm 128: /* Copies of flags for ControlPersist foreground mux-client */
1.359 djm 129: int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
1.344 djm 130:
131: /*
1.33 markus 132: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 133: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 134: * background.
135: */
1.1 deraadt 136: int fork_after_authentication_flag = 0;
137:
1.33 markus 138: /*
139: * General data structure for command line options and options configurable
140: * in configuration files. See readconf.h.
141: */
1.1 deraadt 142: Options options;
143:
1.139 markus 144: /* optional user configfile */
145: char *config = NULL;
146:
1.33 markus 147: /*
148: * Name of the host we are connecting to. This is the name given on the
1.503 jmc 149: * command line, or the Hostname specified for the user-supplied name in a
1.33 markus 150: * configuration file.
151: */
1.1 deraadt 152: char *host;
153:
1.510 djm 154: /*
155: * A config can specify a path to forward, overriding SSH_AUTH_SOCK. If this is
156: * not NULL, forward the socket at this path instead.
157: */
158: char *forward_agent_sock_path = NULL;
159:
1.466 djm 160: /* Various strings used to to percent_expand() arguments */
161: static char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
162: static char uidstr[32], *host_arg, *conn_hash_hex;
1.533 dtucker 163: static const char *keyalias;
1.466 djm 164:
1.22 provos 165: /* socket address the host resolves to */
1.37 markus 166: struct sockaddr_storage hostaddr;
1.1 deraadt 167:
1.112 markus 168: /* Private host keys. */
1.173 markus 169: Sensitive sensitive_data;
1.1 deraadt 170:
1.45 markus 171: /* command to be executed */
1.482 markus 172: struct sshbuf *command;
1.45 markus 173:
1.85 djm 174: /* Should we execute a command or invoke a subsystem? */
175: int subsystem_flag = 0;
176:
1.170 markus 177: /* # of replies received for global requests */
1.523 djm 178: static int forward_confirms_pending = -1;
1.170 markus 179:
1.313 djm 180: /* mux.c */
181: extern int muxserver_sock;
182: extern u_int muxclient_command;
183:
1.1 deraadt 184: /* Prints a help message to the user. This function never returns. */
185:
1.126 itojun 186: static void
1.93 itojun 187: usage(void)
1.1 deraadt 188: {
1.208 markus 189: fprintf(stderr,
1.474 djm 190: "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n"
191: " [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n"
192: " [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n"
193: " [-i identity_file] [-J [user@]host[:port]] [-L address]\n"
194: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
195: " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
196: " [-w local_tun[:remote_tun]] destination [command]\n"
1.208 markus 197: );
1.257 dtucker 198: exit(255);
1.1 deraadt 199: }
200:
1.466 djm 201: static int ssh_session2(struct ssh *, struct passwd *);
202: static void load_public_identity_files(struct passwd *);
1.352 djm 203: static void main_sigchld_handler(int);
1.312 djm 204:
1.361 djm 205: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
206: static void
207: tilde_expand_paths(char **paths, u_int num_paths)
208: {
209: u_int i;
210: char *cp;
211:
212: for (i = 0; i < num_paths; i++) {
1.490 dtucker 213: cp = tilde_expand_filename(paths[i], getuid());
1.378 djm 214: free(paths[i]);
1.361 djm 215: paths[i] = cp;
216: }
217: }
218:
1.527 dtucker 219: #define DEFAULT_CLIENT_PERCENT_EXPAND_ARGS \
220: "C", conn_hash_hex, \
221: "L", shorthost, \
222: "i", uidstr, \
1.533 dtucker 223: "k", keyalias, \
1.527 dtucker 224: "l", thishost, \
225: "n", host_arg, \
226: "p", portstr
227:
228: /*
229: * Expands the set of percent_expand options used by the majority of keywords
230: * in the client that support percent expansion.
231: * Caller must free returned string.
232: */
233: static char *
234: default_client_percent_expand(const char *str, const char *homedir,
235: const char *remhost, const char *remuser, const char *locuser)
236: {
237: return percent_expand(str,
238: /* values from statics above */
239: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS,
240: /* values from arguments */
241: "d", homedir,
242: "h", remhost,
243: "r", remuser,
244: "u", locuser,
245: (char *)NULL);
246: }
247:
1.400 djm 248: /*
1.528 dtucker 249: * Expands the set of percent_expand options used by the majority of keywords
250: * AND perform environment variable substitution.
251: * Caller must free returned string.
252: */
253: static char *
254: default_client_percent_dollar_expand(const char *str, const char *homedir,
255: const char *remhost, const char *remuser, const char *locuser)
256: {
257: char *ret;
258:
259: ret = percent_dollar_expand(str,
260: /* values from statics above */
261: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS,
262: /* values from arguments */
263: "d", homedir,
264: "h", remhost,
265: "r", remuser,
266: "u", locuser,
267: (char *)NULL);
268: if (ret == NULL)
269: fatal("invalid environment variable expansion");
270: return ret;
271: }
272:
273: /*
1.400 djm 274: * Attempt to resolve a host name / port to a set of addresses and
275: * optionally return any CNAMEs encountered along the way.
276: * Returns NULL on failure.
277: * NB. this function must operate with a options having undefined members.
278: */
1.385 djm 279: static struct addrinfo *
1.400 djm 280: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 281: {
282: char strport[NI_MAXSERV];
283: struct addrinfo hints, *res;
1.501 dtucker 284: int gaierr;
285: LogLevel loglevel = SYSLOG_LEVEL_DEBUG1;
1.385 djm 286:
1.400 djm 287: if (port <= 0)
288: port = default_ssh_port();
1.521 markus 289: if (cname != NULL)
290: *cname = '\0';
1.400 djm 291:
1.427 djm 292: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 293: memset(&hints, 0, sizeof(hints));
1.400 djm 294: hints.ai_family = options.address_family == -1 ?
295: AF_UNSPEC : options.address_family;
1.385 djm 296: hints.ai_socktype = SOCK_STREAM;
297: if (cname != NULL)
298: hints.ai_flags = AI_CANONNAME;
299: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
300: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
301: loglevel = SYSLOG_LEVEL_ERROR;
302: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
303: __progname, name, ssh_gai_strerror(gaierr));
304: return NULL;
305: }
306: if (cname != NULL && res->ai_canonname != NULL) {
307: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
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",
1.402 markus 870: SSH_VERSION,
871: #ifdef WITH_OPENSSL
1.495 djm 872: OpenSSL_version(OPENSSL_VERSION)
1.402 markus 873: #else
874: "without OpenSSL"
875: #endif
876: );
1.31 markus 877: if (opt == 'V')
878: exit(0);
879: break;
1.255 reyk 880: case 'w':
1.256 reyk 881: if (options.tun_open == -1)
882: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 883: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 884: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 885: fprintf(stderr,
886: "Bad tun device '%s'\n", optarg);
1.257 dtucker 887: exit(255);
1.255 reyk 888: }
889: break;
1.331 dtucker 890: case 'W':
1.441 dtucker 891: if (options.stdio_forward_host != NULL)
1.332 djm 892: fatal("stdio forward already specified");
893: if (muxclient_command != 0)
894: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 895: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 896: options.stdio_forward_host = fwd.listen_host;
897: options.stdio_forward_port = fwd.listen_port;
1.378 djm 898: free(fwd.connect_host);
1.331 dtucker 899: } else {
900: fprintf(stderr,
901: "Bad stdio forwarding specification '%s'\n",
902: optarg);
903: exit(255);
904: }
1.359 djm 905: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 906: no_shell_flag = 1;
907: break;
1.31 markus 908: case 'q':
909: options.log_level = SYSLOG_LEVEL_QUIET;
910: break;
911: case 'e':
912: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 913: (u_char) optarg[1] >= 64 &&
914: (u_char) optarg[1] < 128)
1.78 markus 915: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 916: else if (strlen(optarg) == 1)
1.78 markus 917: options.escape_char = (u_char) optarg[0];
1.31 markus 918: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 919: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 920: else {
1.128 fgsch 921: fprintf(stderr, "Bad escape character '%s'.\n",
922: optarg);
1.257 dtucker 923: exit(255);
1.31 markus 924: }
925: break;
926: case 'c':
1.506 naddy 927: if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
1.420 djm 928: optarg + 1 : optarg)) {
929: fprintf(stderr, "Unknown cipher type '%s'\n",
930: optarg);
931: exit(255);
1.95 markus 932: }
1.456 djm 933: free(options.ciphers);
934: options.ciphers = xstrdup(optarg);
1.95 markus 935: break;
936: case 'm':
1.422 dtucker 937: if (mac_valid(optarg)) {
938: free(options.macs);
1.95 markus 939: options.macs = xstrdup(optarg);
1.422 dtucker 940: } else {
1.128 fgsch 941: fprintf(stderr, "Unknown mac type '%s'\n",
942: optarg);
1.257 dtucker 943: exit(255);
1.31 markus 944: }
945: break;
1.214 djm 946: case 'M':
1.242 djm 947: if (options.control_master == SSHCTL_MASTER_YES)
948: options.control_master = SSHCTL_MASTER_ASK;
949: else
950: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 951: break;
1.31 markus 952: case 'p':
1.465 millert 953: if (options.port == -1) {
954: options.port = a2port(optarg);
955: if (options.port <= 0) {
956: fprintf(stderr, "Bad port '%s'\n",
957: optarg);
958: exit(255);
959: }
1.109 markus 960: }
1.31 markus 961: break;
962: case 'l':
1.465 millert 963: if (options.user == NULL)
964: options.user = optarg;
1.31 markus 965: break;
1.141 stevesk 966:
967: case 'L':
1.324 djm 968: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 969: add_local_forward(&options, &fwd);
970: else {
1.128 fgsch 971: fprintf(stderr,
1.232 djm 972: "Bad local forwarding specification '%s'\n",
1.128 fgsch 973: optarg);
1.257 dtucker 974: exit(255);
1.31 markus 975: }
1.232 djm 976: break;
977:
978: case 'R':
1.464 markus 979: if (parse_forward(&fwd, optarg, 0, 1) ||
980: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 981: add_remote_forward(&options, &fwd);
982: } else {
1.128 fgsch 983: fprintf(stderr,
1.232 djm 984: "Bad remote forwarding specification "
985: "'%s'\n", optarg);
1.257 dtucker 986: exit(255);
1.31 markus 987: }
988: break;
1.108 markus 989:
990: case 'D':
1.324 djm 991: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 992: add_local_forward(&options, &fwd);
1.232 djm 993: } else {
1.322 stevesk 994: fprintf(stderr,
995: "Bad dynamic forwarding specification "
996: "'%s'\n", optarg);
1.257 dtucker 997: exit(255);
1.109 markus 998: }
1.108 markus 999: break;
1000:
1.31 markus 1001: case 'C':
1.513 dtucker 1002: #ifdef WITH_ZLIB
1.31 markus 1003: options.compression = 1;
1.513 dtucker 1004: #else
1005: error("Compression not supported, disabling.");
1006: #endif
1.31 markus 1007: break;
1.45 markus 1008: case 'N':
1009: no_shell_flag = 1;
1.359 djm 1010: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1011: break;
1012: case 'T':
1.359 djm 1013: options.request_tty = REQUEST_TTY_NO;
1.45 markus 1014: break;
1.31 markus 1015: case 'o':
1.205 markus 1016: line = xstrdup(optarg);
1.408 djm 1017: if (process_config_line(&options, pw,
1018: host ? host : "", host ? host : "", line,
1019: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 1020: exit(255);
1.378 djm 1021: free(line);
1.31 markus 1022: break;
1.85 djm 1023: case 's':
1024: subsystem_flag = 1;
1.117 markus 1025: break;
1.214 djm 1026: case 'S':
1.431 mmcc 1027: free(options.control_path);
1.214 djm 1028: options.control_path = xstrdup(optarg);
1029: break;
1.117 markus 1030: case 'b':
1031: options.bind_address = optarg;
1.474 djm 1032: break;
1033: case 'B':
1034: options.bind_interface = optarg;
1.85 djm 1035: break;
1.139 markus 1036: case 'F':
1037: config = optarg;
1038: break;
1.31 markus 1039: default:
1040: usage();
1.1 deraadt 1041: }
1.31 markus 1042: }
1043:
1.462 djm 1044: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
1045: opt_terminated = 1;
1046:
1.128 fgsch 1047: ac -= optind;
1048: av += optind;
1049:
1.329 guenther 1050: if (ac > 0 && !host) {
1.465 millert 1051: int tport;
1052: char *tuser;
1053: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
1054: case -1:
1055: usage();
1056: break;
1057: case 0:
1058: if (options.user == NULL) {
1059: options.user = tuser;
1060: tuser = NULL;
1061: }
1062: free(tuser);
1063: if (options.port == -1 && tport != -1)
1064: options.port = tport;
1065: break;
1066: default:
1.128 fgsch 1067: p = xstrdup(*av);
1.188 markus 1068: cp = strrchr(p, '@');
1.465 millert 1069: if (cp != NULL) {
1070: if (cp == p)
1071: usage();
1072: if (options.user == NULL) {
1073: options.user = p;
1074: p = NULL;
1075: }
1076: *cp++ = '\0';
1077: host = xstrdup(cp);
1078: free(p);
1079: } else
1080: host = p;
1081: break;
1082: }
1.462 djm 1083: if (ac > 1 && !opt_terminated) {
1.189 millert 1084: optind = optreset = 1;
1.128 fgsch 1085: goto again;
1086: }
1.189 millert 1087: ac--, av++;
1.128 fgsch 1088: }
1089:
1.31 markus 1090: /* Check that we got a host name. */
1091: if (!host)
1092: usage();
1093:
1.385 djm 1094: host_arg = xstrdup(host);
1095:
1.402 markus 1096: #ifdef WITH_OPENSSL
1.350 djm 1097: OpenSSL_add_all_algorithms();
1.72 markus 1098: ERR_load_crypto_strings();
1.402 markus 1099: #endif
1.31 markus 1100:
1101: /* Initialize the command to execute on remote host. */
1.482 markus 1102: if ((command = sshbuf_new()) == NULL)
1103: fatal("sshbuf_new failed");
1.1 deraadt 1104:
1.33 markus 1105: /*
1106: * Save the command to execute on the remote host in a buffer. There
1107: * is no limit on the length of the command, except by the maximum
1108: * packet size. Also sets the tty flag if there is no command.
1109: */
1.128 fgsch 1110: if (!ac) {
1.31 markus 1111: /* No command specified - execute shell on a tty. */
1.85 djm 1112: if (subsystem_flag) {
1.128 fgsch 1113: fprintf(stderr,
1114: "You must specify a subsystem to invoke.\n");
1.85 djm 1115: usage();
1116: }
1.31 markus 1117: } else {
1.128 fgsch 1118: /* A command has been specified. Store it into the buffer. */
1119: for (i = 0; i < ac; i++) {
1.482 markus 1120: if ((r = sshbuf_putf(command, "%s%s",
1121: i ? " " : "", av[i])) != 0)
1.540 ! djm 1122: fatal_fr(r, "buffer error");
1.31 markus 1123: }
1124: }
1125:
1.101 markus 1126: /*
1127: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1128: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1129: */
1.375 dtucker 1130: if (use_syslog && logfile != NULL)
1131: fatal("Can't specify both -y and -E");
1.422 dtucker 1132: if (logfile != NULL)
1.375 dtucker 1133: log_redirect_stderr_to(logfile);
1.325 markus 1134: log_init(argv0,
1.468 djm 1135: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1136: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1137: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1138: SYSLOG_FACILITY_USER : options.log_facility,
1139: !use_syslog);
1.375 dtucker 1140:
1141: if (debug_flag)
1.402 markus 1142: logit("%s, %s", SSH_VERSION,
1143: #ifdef WITH_OPENSSL
1.495 djm 1144: OpenSSL_version(OPENSSL_VERSION)
1.402 markus 1145: #else
1146: "without OpenSSL"
1147: #endif
1148: );
1.31 markus 1149:
1.400 djm 1150: /* Parse the configuration files */
1.496 djm 1151: process_config_files(host_arg, pw, 0, &want_final_pass);
1152: if (want_final_pass)
1153: debug("configuration requests final Match pass");
1.400 djm 1154:
1155: /* Hostname canonicalisation needs a few options filled. */
1156: fill_default_options_for_canonicalization(&options);
1157:
1158: /* If the user has replaced the hostname then take it into use now */
1159: if (options.hostname != NULL) {
1160: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1161: cp = percent_expand(options.hostname,
1162: "h", host, (char *)NULL);
1163: free(host);
1164: host = cp;
1.408 djm 1165: free(options.hostname);
1166: options.hostname = xstrdup(host);
1.400 djm 1167: }
1168:
1.470 djm 1169: /* Don't lowercase addresses, they will be explicitly canonicalised */
1170: if ((was_addr = is_addr(host)) == 0)
1171: lowercase(host);
1172:
1173: /*
1174: * Try to canonicalize if requested by configuration or the
1175: * hostname is an address.
1176: */
1177: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1178: addrs = resolve_canonicalize(&host, options.port);
1179:
1.139 markus 1180: /*
1.401 djm 1181: * If CanonicalizePermittedCNAMEs have been specified but
1182: * other canonicalization did not happen (by not being requested
1183: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1184: * as a result of CNAME following.
1.401 djm 1185: *
1186: * Try to resolve the bare hostname name using the system resolver's
1187: * usual search rules and then apply the CNAME follow rules.
1188: *
1189: * Skip the lookup if a ProxyCommand is being used unless the user
1190: * has specifically requested canonicalisation for this case via
1191: * CanonicalizeHostname=always
1.139 markus 1192: */
1.443 djm 1193: direct = option_clear_or_none(options.proxy_command) &&
1194: options.jump_host == NULL;
1195: if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1196: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1197: if ((addrs = resolve_host(host, options.port,
1.493 djm 1198: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1199: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1200: if (direct)
1.403 djm 1201: cleanup_exit(255); /* logged in resolve_host */
1202: } else
1.443 djm 1203: check_follow_cname(direct, &host, cname);
1.400 djm 1204: }
1.139 markus 1205:
1.400 djm 1206: /*
1.408 djm 1207: * If canonicalisation is enabled then re-parse the configuration
1208: * files as new stanzas may match.
1.400 djm 1209: */
1.496 djm 1210: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1211: debug("hostname canonicalisation enabled, "
1212: "will re-parse configuration");
1213: want_final_pass = 1;
1214: }
1215:
1216: if (want_final_pass) {
1217: debug("re-parsing configuration");
1.408 djm 1218: free(options.hostname);
1219: options.hostname = xstrdup(host);
1.496 djm 1220: process_config_files(host_arg, pw, 1, NULL);
1.408 djm 1221: /*
1222: * Address resolution happens early with canonicalisation
1223: * enabled and the port number may have changed since, so
1224: * reset it in address list
1225: */
1226: if (addrs != NULL && options.port > 0)
1227: set_addrinfo_port(addrs, options.port);
1.139 markus 1228: }
1.31 markus 1229:
1230: /* Fill configuration defaults. */
1231: fill_default_options(&options);
1.443 djm 1232:
1.534 dtucker 1233: if (options.user == NULL)
1234: options.user = xstrdup(pw->pw_name);
1235:
1.443 djm 1236: /*
1237: * If ProxyJump option specified, then construct a ProxyCommand now.
1238: */
1239: if (options.jump_host != NULL) {
1240: char port_s[8];
1.534 dtucker 1241: const char *jumpuser = options.jump_user, *sshbin = argv0;
1.520 dtucker 1242: int port = options.port, jumpport = options.jump_port;
1243:
1244: if (port <= 0)
1245: port = default_ssh_port();
1246: if (jumpport <= 0)
1247: jumpport = default_ssh_port();
1.534 dtucker 1248: if (jumpuser == NULL)
1249: jumpuser = options.user;
1250: if (strcmp(options.jump_host, host) == 0 && port == jumpport &&
1251: strcmp(options.user, jumpuser) == 0)
1.520 dtucker 1252: fatal("jumphost loop via %s", options.jump_host);
1.478 djm 1253:
1254: /*
1255: * Try to use SSH indicated by argv[0], but fall back to
1256: * "ssh" if it appears unavailable.
1257: */
1258: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1259: sshbin = "ssh";
1.443 djm 1260:
1261: /* Consistency check */
1262: if (options.proxy_command != NULL)
1263: fatal("inconsistent options: ProxyCommand+ProxyJump");
1264: /* Never use FD passing for ProxyJump */
1265: options.proxy_use_fdpass = 0;
1266: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1267: xasprintf(&options.proxy_command,
1.478 djm 1268: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1269: sshbin,
1.443 djm 1270: /* Optional "-l user" argument if jump_user set */
1271: options.jump_user == NULL ? "" : " -l ",
1272: options.jump_user == NULL ? "" : options.jump_user,
1273: /* Optional "-p port" argument if jump_port set */
1274: options.jump_port <= 0 ? "" : " -p ",
1275: options.jump_port <= 0 ? "" : port_s,
1276: /* Optional additional jump hosts ",..." */
1277: options.jump_extra == NULL ? "" : " -J ",
1278: options.jump_extra == NULL ? "" : options.jump_extra,
1279: /* Optional "-F" argumment if -F specified */
1280: config == NULL ? "" : " -F ",
1281: config == NULL ? "" : config,
1282: /* Optional "-v" arguments if -v set */
1283: debug_flag ? " -" : "",
1284: debug_flag, "vvv",
1285: /* Mandatory hostname */
1286: options.jump_host);
1287: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1288: options.proxy_command);
1289: }
1.31 markus 1290:
1.400 djm 1291: if (options.port == 0)
1292: options.port = default_ssh_port();
1.463 djm 1293: channel_set_af(ssh, options.address_family);
1.196 djm 1294:
1.383 djm 1295: /* Tidy and check options */
1296: if (options.host_key_alias != NULL)
1297: lowercase(options.host_key_alias);
1298: if (options.proxy_command != NULL &&
1299: strcmp(options.proxy_command, "-") == 0 &&
1300: options.proxy_use_fdpass)
1301: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.516 markus 1302: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1303: if (options.control_persist && options.control_path != NULL) {
1304: debug("UpdateHostKeys=ask is incompatible with "
1305: "ControlPersist; disabling");
1306: options.update_hostkeys = 0;
1307: } else if (sshbuf_len(command) != 0 ||
1308: options.remote_command != NULL ||
1309: options.request_tty == REQUEST_TTY_NO) {
1310: debug("UpdateHostKeys=ask is incompatible with "
1311: "remote command execution; disabling");
1.517 djm 1312: options.update_hostkeys = 0;
1313: } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1314: /* no point logging anything; user won't see it */
1.516 markus 1315: options.update_hostkeys = 0;
1316: }
1.415 djm 1317: }
1.430 djm 1318: if (options.connection_attempts <= 0)
1319: fatal("Invalid number of ConnectionAttempts");
1320:
1.482 markus 1321: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1322: fatal("Cannot execute command-line and remote command.");
1323:
1324: /* Cannot fork to background if no command. */
1.482 markus 1325: if (fork_after_authentication_flag && sshbuf_len(command) == 0 &&
1.461 bluhm 1326: options.remote_command == NULL && !no_shell_flag)
1327: fatal("Cannot fork into background without a command "
1328: "to execute.");
1329:
1.31 markus 1330: /* reinit */
1.452 dtucker 1331: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.539 djm 1332: for (j = 0; j < options.num_log_verbose; j++)
1333: log_verbose_add(options.log_verbose[j]);
1.370 djm 1334:
1335: if (options.request_tty == REQUEST_TTY_YES ||
1336: options.request_tty == REQUEST_TTY_FORCE)
1337: tty_flag = 1;
1338:
1339: /* Allocate a tty by default if no command specified. */
1.482 markus 1340: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1341: tty_flag = options.request_tty != REQUEST_TTY_NO;
1342:
1343: /* Force no tty */
1.447 markus 1344: if (options.request_tty == REQUEST_TTY_NO ||
1345: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
1.370 djm 1346: tty_flag = 0;
1347: /* Do not allocate a tty if stdin is not a tty. */
1348: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1349: options.request_tty != REQUEST_TTY_FORCE) {
1350: if (tty_flag)
1351: logit("Pseudo-terminal will not be allocated because "
1352: "stdin is not a terminal.");
1353: tty_flag = 0;
1354: }
1.343 djm 1355:
1.466 djm 1356: /* Set up strings used to percent_expand() arguments */
1.358 djm 1357: if (gethostname(thishost, sizeof(thishost)) == -1)
1358: fatal("gethostname: %s", strerror(errno));
1359: strlcpy(shorthost, thishost, sizeof(shorthost));
1360: shorthost[strcspn(thishost, ".")] = '\0';
1361: snprintf(portstr, sizeof(portstr), "%d", options.port);
1.479 djm 1362: snprintf(uidstr, sizeof(uidstr), "%llu",
1363: (unsigned long long)pw->pw_uid);
1.533 dtucker 1364: keyalias = options.host_key_alias ? options.host_key_alias : host_arg;
1.358 djm 1365:
1.522 dtucker 1366: conn_hash_hex = ssh_connection_hash(thishost, host, portstr,
1367: options.user);
1.405 djm 1368:
1.466 djm 1369: /*
1370: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1371: * after port-forwarding is set up, so it may pick up any local
1372: * tunnel interface name allocated.
1373: */
1.461 bluhm 1374: if (options.remote_command != NULL) {
1375: debug3("expanding RemoteCommand: %s", options.remote_command);
1376: cp = options.remote_command;
1.527 dtucker 1377: options.remote_command = default_client_percent_expand(cp,
1378: pw->pw_dir, host, options.user, pw->pw_name);
1.461 bluhm 1379: debug3("expanded RemoteCommand: %s", options.remote_command);
1380: free(cp);
1.482 markus 1381: if ((r = sshbuf_put(command, options.remote_command,
1382: strlen(options.remote_command))) != 0)
1.540 ! djm 1383: fatal_fr(r, "buffer error");
1.304 dtucker 1384: }
1.31 markus 1385:
1.214 djm 1386: if (options.control_path != NULL) {
1.490 dtucker 1387: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1388: free(options.control_path);
1.528 dtucker 1389: options.control_path = default_client_percent_dollar_expand(cp,
1.527 dtucker 1390: pw->pw_dir, host, options.user, pw->pw_name);
1.378 djm 1391: free(cp);
1.214 djm 1392: }
1.408 djm 1393:
1.522 dtucker 1394: if (options.identity_agent != NULL) {
1395: p = tilde_expand_filename(options.identity_agent, getuid());
1.528 dtucker 1396: cp = default_client_percent_dollar_expand(p,
1.527 dtucker 1397: pw->pw_dir, host, options.user, pw->pw_name);
1.522 dtucker 1398: free(p);
1399: free(options.identity_agent);
1400: options.identity_agent = cp;
1401: }
1402:
1403: if (options.forward_agent_sock_path != NULL) {
1404: p = tilde_expand_filename(options.forward_agent_sock_path,
1405: getuid());
1.528 dtucker 1406: cp = default_client_percent_dollar_expand(p,
1.527 dtucker 1407: pw->pw_dir, host, options.user, pw->pw_name);
1.522 dtucker 1408: free(p);
1409: free(options.forward_agent_sock_path);
1410: options.forward_agent_sock_path = cp;
1.532 dtucker 1411: }
1412:
1413: for (j = 0; j < options.num_user_hostfiles; j++) {
1414: if (options.user_hostfiles[j] != NULL) {
1415: cp = tilde_expand_filename(options.user_hostfiles[j],
1416: getuid());
1417: p = default_client_percent_dollar_expand(cp,
1418: pw->pw_dir, host, options.user, pw->pw_name);
1419: if (strcmp(options.user_hostfiles[j], p) != 0)
1420: debug3("expanded UserKnownHostsFile '%s' -> "
1421: "'%s'", options.user_hostfiles[j], p);
1422: free(options.user_hostfiles[j]);
1423: free(cp);
1424: options.user_hostfiles[j] = p;
1425: }
1.522 dtucker 1426: }
1427:
1.527 dtucker 1428: for (i = 0; i < options.num_local_forwards; i++) {
1429: if (options.local_forwards[i].listen_path != NULL) {
1430: cp = options.local_forwards[i].listen_path;
1431: p = options.local_forwards[i].listen_path =
1432: default_client_percent_expand(cp,
1433: pw->pw_dir, host, options.user, pw->pw_name);
1434: if (strcmp(cp, p) != 0)
1435: debug3("expanded LocalForward listen path "
1436: "'%s' -> '%s'", cp, p);
1437: free(cp);
1438: }
1439: if (options.local_forwards[i].connect_path != NULL) {
1440: cp = options.local_forwards[i].connect_path;
1441: p = options.local_forwards[i].connect_path =
1442: default_client_percent_expand(cp,
1443: pw->pw_dir, host, options.user, pw->pw_name);
1444: if (strcmp(cp, p) != 0)
1445: debug3("expanded LocalForward connect path "
1446: "'%s' -> '%s'", cp, p);
1447: free(cp);
1448: }
1449: }
1450:
1451: for (i = 0; i < options.num_remote_forwards; i++) {
1452: if (options.remote_forwards[i].listen_path != NULL) {
1453: cp = options.remote_forwards[i].listen_path;
1454: p = options.remote_forwards[i].listen_path =
1455: default_client_percent_expand(cp,
1456: pw->pw_dir, host, options.user, pw->pw_name);
1457: if (strcmp(cp, p) != 0)
1458: debug3("expanded RemoteForward listen path "
1459: "'%s' -> '%s'", cp, p);
1460: free(cp);
1461: }
1462: if (options.remote_forwards[i].connect_path != NULL) {
1463: cp = options.remote_forwards[i].connect_path;
1464: p = options.remote_forwards[i].connect_path =
1465: default_client_percent_expand(cp,
1466: pw->pw_dir, host, options.user, pw->pw_name);
1467: if (strcmp(cp, p) != 0)
1468: debug3("expanded RemoteForward connect path "
1469: "'%s' -> '%s'", cp, p);
1470: free(cp);
1471: }
1472: }
1473:
1.408 djm 1474: if (config_test) {
1475: dump_client_config(&options, host);
1476: exit(0);
1.508 djm 1477: }
1478:
1479: /* Expand SecurityKeyProvider if it refers to an environment variable */
1480: if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1481: strlen(options.sk_provider) > 1) {
1482: if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1.518 naddy 1483: debug("Authenticator provider %s did not resolve; "
1.508 djm 1484: "disabling", options.sk_provider);
1485: free(options.sk_provider);
1486: options.sk_provider = NULL;
1487: } else {
1488: debug2("resolved SecurityKeyProvider %s => %s",
1489: options.sk_provider, cp);
1490: free(options.sk_provider);
1491: options.sk_provider = xstrdup(cp);
1492: }
1.408 djm 1493: }
1.405 djm 1494:
1.312 djm 1495: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1496: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1497: if (options.control_path != NULL) {
1498: int sock;
1499: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1500: ssh_packet_set_connection(ssh, sock, sock);
1.499 djm 1501: ssh_packet_set_mux(ssh);
1.447 markus 1502: goto skip_connect;
1503: }
1504: }
1.401 djm 1505:
1506: /*
1507: * If hostname canonicalisation was not enabled, then we may not
1508: * have yet resolved the hostname. Do so now.
1509: */
1510: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1511: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1512: if ((addrs = resolve_host(host, options.port, 1,
1513: cname, sizeof(cname))) == NULL)
1514: cleanup_exit(255); /* resolve_host logs the error */
1515: }
1.214 djm 1516:
1.303 djm 1517: timeout_ms = options.connection_timeout * 1000;
1518:
1.77 markus 1519: /* Open a connection to the remote host. */
1.511 beck 1520: if (ssh_connect(ssh, host, host_arg, addrs, &hostaddr, options.port,
1.538 kn 1521: options.connection_attempts,
1.488 dtucker 1522: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1523: exit(255);
1.31 markus 1524:
1.391 djm 1525: if (addrs != NULL)
1526: freeaddrinfo(addrs);
1527:
1.499 djm 1528: ssh_packet_set_timeout(ssh, options.server_alive_interval,
1.385 djm 1529: options.server_alive_count_max);
1530:
1.303 djm 1531: if (timeout_ms > 0)
1532: debug3("timeout: %d ms remain after connect", timeout_ms);
1533:
1.33 markus 1534: /*
1.485 dtucker 1535: * If we successfully made the connection and we have hostbased auth
1536: * enabled, load the public keys so we can later use the ssh-keysign
1537: * helper to sign challenges.
1.33 markus 1538: */
1.112 markus 1539: sensitive_data.nkeys = 0;
1540: sensitive_data.keys = NULL;
1.457 djm 1541: if (options.hostbased_authentication) {
1.486 dtucker 1542: sensitive_data.nkeys = 10;
1.274 deraadt 1543: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.483 markus 1544: sizeof(struct sshkey));
1545:
1546: /* XXX check errors? */
1.486 dtucker 1547: #define L_PUBKEY(p,o) do { \
1548: if ((o) >= sensitive_data.nkeys) \
1.540 ! djm 1549: fatal_f("pubkey out of array bounds"); \
1.483 markus 1550: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.486 dtucker 1551: p, "pubkey"); \
1552: } while (0)
1553: #define L_CERT(p,o) do { \
1554: if ((o) >= sensitive_data.nkeys) \
1.540 ! djm 1555: fatal_f("cert out of array bounds"); \
1.486 dtucker 1556: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), p, "cert"); \
1557: } while (0)
1.177 markus 1558:
1.485 dtucker 1559: if (options.hostbased_authentication == 1) {
1.486 dtucker 1560: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1561: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1562: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1563: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1564: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1565: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1566: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1567: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1568: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1569: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.173 markus 1570: }
1.367 djm 1571: }
1.31 markus 1572:
1.104 markus 1573: /* load options.identity_files */
1.466 djm 1574: load_public_identity_files(pw);
1.439 markus 1575:
1.476 djm 1576: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1577: if (options.identity_agent &&
1578: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1579: if (strcmp(options.identity_agent, "none") == 0) {
1580: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1581: } else {
1.522 dtucker 1582: cp = options.identity_agent;
1.528 dtucker 1583: /* legacy (limited) format */
1584: if (cp[0] == '$' && cp[1] != '{') {
1.494 djm 1585: if (!valid_env_name(cp + 1)) {
1586: fatal("Invalid IdentityAgent "
1587: "environment variable name %s", cp);
1588: }
1589: if ((p = getenv(cp + 1)) == NULL)
1590: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1591: else
1592: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1593: } else {
1594: /* identity_agent specifies a path directly */
1595: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1596: }
1.510 djm 1597: }
1598: }
1599:
1.522 dtucker 1600: if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1.526 djm 1601: cp = options.forward_agent_sock_path;
1.510 djm 1602: if (cp[0] == '$') {
1603: if (!valid_env_name(cp + 1)) {
1604: fatal("Invalid ForwardAgent environment variable name %s", cp);
1605: }
1606: if ((p = getenv(cp + 1)) != NULL)
1607: forward_agent_sock_path = p;
1608: else
1609: options.forward_agent = 0;
1610: free(cp);
1611: } else {
1612: forward_agent_sock_path = cp;
1.439 markus 1613: }
1614: }
1.104 markus 1615:
1616: /* Expand ~ in known host file names. */
1.361 djm 1617: tilde_expand_paths(options.system_hostfiles,
1618: options.num_system_hostfiles);
1619: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1620:
1.512 dtucker 1621: ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1622: ssh_signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1623:
1.316 djm 1624: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1625: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1626: options.port, pw, timeout_ms);
1.339 djm 1627:
1.499 djm 1628: if (ssh_packet_connection_is_on_socket(ssh)) {
1.339 djm 1629: verbose("Authenticated to %s ([%s]:%d).", host,
1.437 djm 1630: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
1.339 djm 1631: } else {
1632: verbose("Authenticated to %s (via proxy).", host);
1633: }
1.31 markus 1634:
1.112 markus 1635: /* We no longer need the private host keys. Clear them now. */
1636: if (sensitive_data.nkeys != 0) {
1637: for (i = 0; i < sensitive_data.nkeys; i++) {
1638: if (sensitive_data.keys[i] != NULL) {
1639: /* Destroys contents safely */
1640: debug3("clear hostkey %d", i);
1.483 markus 1641: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1642: sensitive_data.keys[i] = NULL;
1643: }
1644: }
1.378 djm 1645: free(sensitive_data.keys);
1.134 markus 1646: }
1647: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1648: free(options.identity_files[i]);
1649: options.identity_files[i] = NULL;
1.134 markus 1650: if (options.identity_keys[i]) {
1.483 markus 1651: sshkey_free(options.identity_keys[i]);
1.134 markus 1652: options.identity_keys[i] = NULL;
1653: }
1.112 markus 1654: }
1.426 djm 1655: for (i = 0; i < options.num_certificate_files; i++) {
1656: free(options.certificate_files[i]);
1657: options.certificate_files[i] = NULL;
1658: }
1.31 markus 1659:
1.447 markus 1660: skip_connect:
1.466 djm 1661: exit_status = ssh_session2(ssh, pw);
1.499 djm 1662: ssh_packet_close(ssh);
1.186 djm 1663:
1.312 djm 1664: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1665: unlink(options.control_path);
1666:
1.353 djm 1667: /* Kill ProxyCommand if it is running. */
1668: ssh_kill_proxy_command();
1.186 djm 1669:
1.45 markus 1670: return exit_status;
1671: }
1672:
1.344 djm 1673: static void
1674: control_persist_detach(void)
1675: {
1676: pid_t pid;
1677:
1.540 ! djm 1678: debug_f("backgrounding master process");
1.344 djm 1679:
1.473 djm 1680: /*
1681: * master (current process) into the background, and make the
1682: * foreground process a client of the backgrounded master.
1683: */
1.344 djm 1684: switch ((pid = fork())) {
1685: case -1:
1.540 ! djm 1686: fatal_f("fork: %s", strerror(errno));
1.344 djm 1687: case 0:
1688: /* Child: master process continues mainloop */
1.473 djm 1689: break;
1690: default:
1.531 djm 1691: /* Parent: set up mux client to connect to backgrounded master */
1.540 ! djm 1692: debug2_f("background process is %ld", (long)pid);
1.344 djm 1693: stdin_null_flag = ostdin_null_flag;
1.359 djm 1694: options.request_tty = orequest_tty;
1.344 djm 1695: tty_flag = otty_flag;
1.473 djm 1696: close(muxserver_sock);
1697: muxserver_sock = -1;
1.351 markus 1698: options.control_master = SSHCTL_MASTER_NO;
1.473 djm 1699: muxclient(options.control_path);
1.344 djm 1700: /* muxclient() doesn't return on success. */
1.473 djm 1701: fatal("Failed to connect to new control master");
1702: }
1.537 djm 1703: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 ! djm 1704: error_f("stdfd_devnull failed");
1.381 djm 1705: daemon(1, 1);
1.362 djm 1706: setproctitle("%s [mux]", options.control_path);
1.344 djm 1707: }
1708:
1709: /* Do fork() after authentication. Used by "ssh -f" */
1710: static void
1711: fork_postauth(void)
1712: {
1713: if (need_controlpersist_detach)
1714: control_persist_detach();
1715: debug("forking to background");
1716: fork_after_authentication_flag = 0;
1.505 deraadt 1717: if (daemon(1, 1) == -1)
1.344 djm 1718: fatal("daemon() failed: %.200s", strerror(errno));
1.537 djm 1719: if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1.540 ! djm 1720: error_f("stdfd_devnull failed");
1.344 djm 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) {
1.540 ! djm 1729: debug_f("all expected forwarding replies received");
1.523 djm 1730: if (fork_after_authentication_flag)
1731: fork_postauth();
1.524 djm 1732: } else {
1.540 ! djm 1733: debug2_f("%d expected forwarding replies remaining",
! 1734: 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)
1.540 ! djm 1757: fatal_fr(r, "parse packet");
1.499 djm 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:
1.540 ! djm 1823: debug_f("tunnel forward established, id=%d", id);
1.523 djm 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:
1.540 ! djm 1836: debug3_f("%s:%d", options.stdio_forward_host,
1.441 dtucker 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)
1.540 ! djm 1844: fatal_f("channel_connect_stdio_fwd failed");
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) {
1.540 ! djm 1917: debug_f("expecting replies for %d forwards",
1.524 djm 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)
1.540 ! djm 1932: debug_r(r, "ssh_get_authentication_socket");
1.412 djm 1933: }
1.70 markus 1934: }
1935: }
1936:
1.214 djm 1937: static void
1.463 djm 1938: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 1939: {
1.215 djm 1940: extern char **environ;
1.243 djm 1941: const char *display;
1.499 djm 1942: int r, interactive = tty_flag;
1.433 djm 1943: char *proto = NULL, *data = NULL;
1.337 djm 1944:
1945: if (!success)
1946: return; /* No need for error message, channels code sens one */
1.215 djm 1947:
1.248 djm 1948: display = getenv("DISPLAY");
1.417 djm 1949: if (display == NULL && options.forward_x11)
1950: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 1951: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 1952: options.xauth_location, options.forward_x11_trusted,
1953: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 1954: /* Request forwarding with authentication spoofing. */
1.316 djm 1955: debug("Requesting X11 forwarding with authentication "
1956: "spoofing.");
1.463 djm 1957: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 1958: data, 1);
1.463 djm 1959: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 1960: /* XXX exit_on_forward_failure */
1.80 markus 1961: interactive = 1;
1.50 markus 1962: }
1963:
1.70 markus 1964: check_agent_present();
1965: if (options.forward_agent) {
1966: debug("Requesting authentication agent forwarding.");
1.463 djm 1967: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.499 djm 1968: if ((r = sshpkt_send(ssh)) != 0)
1.540 ! djm 1969: fatal_fr(r, "send packet");
1.212 djm 1970: }
1.369 dtucker 1971:
1972: /* Tell the packet module whether this is an interactive session. */
1.499 djm 1973: ssh_packet_set_interactive(ssh, interactive,
1.369 dtucker 1974: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1975:
1.463 djm 1976: client_session2_setup(ssh, id, tty_flag, subsystem_flag, getenv("TERM"),
1.482 markus 1977: NULL, fileno(stdin), command, environ);
1.45 markus 1978: }
1979:
1.143 markus 1980: /* open new channel for a session */
1.126 itojun 1981: static int
1.463 djm 1982: ssh_session2_open(struct ssh *ssh)
1.45 markus 1983: {
1.118 markus 1984: Channel *c;
1985: int window, packetmax, in, out, err;
1.60 markus 1986:
1.62 markus 1987: if (stdin_null_flag) {
1.93 itojun 1988: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1989: } else {
1990: in = dup(STDIN_FILENO);
1991: }
1.60 markus 1992: out = dup(STDOUT_FILENO);
1993: err = dup(STDERR_FILENO);
1.45 markus 1994:
1.505 deraadt 1995: if (in == -1 || out == -1 || err == -1)
1.62 markus 1996: fatal("dup() in/out/err failed");
1.45 markus 1997:
1.69 markus 1998: /* enable nonblocking unless tty */
1999: if (!isatty(in))
2000: set_nonblock(in);
2001: if (!isatty(out))
2002: set_nonblock(out);
2003: if (!isatty(err))
2004: set_nonblock(err);
2005:
1.65 markus 2006: window = CHAN_SES_WINDOW_DEFAULT;
2007: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 2008: if (tty_flag) {
2009: window >>= 1;
2010: packetmax >>= 1;
1.45 markus 2011: }
1.463 djm 2012: c = channel_new(ssh,
1.45 markus 2013: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 2014: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 2015: "client-session", /*nonblock*/0);
1.45 markus 2016:
1.540 ! djm 2017: debug3_f("channel_new: %d", c->self);
1.106 markus 2018:
1.463 djm 2019: channel_send_open(ssh, c->self);
1.143 markus 2020: if (!no_shell_flag)
1.463 djm 2021: channel_register_open_confirm(ssh, c->self,
1.310 djm 2022: ssh_session2_setup, NULL);
1.106 markus 2023:
1.118 markus 2024: return c->self;
1.106 markus 2025: }
2026:
1.126 itojun 2027: static int
1.466 djm 2028: ssh_session2(struct ssh *ssh, struct passwd *pw)
1.106 markus 2029: {
1.537 djm 2030: int r, id = -1;
1.466 djm 2031: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 2032:
2033: /* XXX should be pre-session */
1.368 djm 2034: if (!options.control_persist)
1.463 djm 2035: ssh_init_stdio_forwarding(ssh);
1.466 djm 2036:
2037: ssh_init_forwarding(ssh, &tun_fwd_ifname);
2038:
2039: if (options.local_command != NULL) {
2040: debug3("expanding LocalCommand: %s", options.local_command);
2041: cp = options.local_command;
2042: options.local_command = percent_expand(cp,
1.522 dtucker 2043: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS,
1.466 djm 2044: "d", pw->pw_dir,
2045: "h", host,
2046: "r", options.user,
2047: "u", pw->pw_name,
2048: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2049: (char *)NULL);
2050: debug3("expanded LocalCommand: %s", options.local_command);
2051: free(cp);
2052: }
1.106 markus 2053:
1.344 djm 2054: /* Start listening for multiplex clients */
1.499 djm 2055: if (!ssh_packet_get_mux(ssh))
1.463 djm 2056: muxserver_listen(ssh);
1.344 djm 2057:
1.473 djm 2058: /*
1.368 djm 2059: * If we are in control persist mode and have a working mux listen
2060: * socket, then prepare to background ourselves and have a foreground
1.531 djm 2061: * client attach as a control client.
1.368 djm 2062: * NB. we must save copies of the flags that we override for
1.531 djm 2063: * the backgrounding, since we defer attachment of the client until
1.344 djm 2064: * after the connection is fully established (in particular,
2065: * async rfwd replies have been received for ExitOnForwardFailure).
2066: */
1.473 djm 2067: if (options.control_persist && muxserver_sock != -1) {
1.344 djm 2068: ostdin_null_flag = stdin_null_flag;
2069: ono_shell_flag = no_shell_flag;
1.359 djm 2070: orequest_tty = options.request_tty;
1.344 djm 2071: otty_flag = tty_flag;
1.473 djm 2072: stdin_null_flag = 1;
2073: no_shell_flag = 1;
2074: tty_flag = 0;
1.344 djm 2075: if (!fork_after_authentication_flag)
2076: need_controlpersist_detach = 1;
2077: fork_after_authentication_flag = 1;
1.473 djm 2078: }
1.368 djm 2079: /*
2080: * ControlPersist mux listen socket setup failed, attempt the
2081: * stdio forward setup that we skipped earlier.
2082: */
2083: if (options.control_persist && muxserver_sock == -1)
1.463 djm 2084: ssh_init_stdio_forwarding(ssh);
1.344 djm 2085:
1.471 djm 2086: if (!no_shell_flag)
1.463 djm 2087: id = ssh_session2_open(ssh);
1.379 djm 2088: else {
1.499 djm 2089: ssh_packet_set_interactive(ssh,
1.379 djm 2090: options.control_master == SSHCTL_MASTER_NO,
2091: options.ip_qos_interactive, options.ip_qos_bulk);
2092: }
1.314 djm 2093:
2094: /* If we don't expect to open a new session, then disallow it */
1.319 markus 2095: if (options.control_master == SSHCTL_MASTER_NO &&
2096: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 2097: debug("Requesting no-more-sessions@openssh.com");
1.499 djm 2098: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2099: (r = sshpkt_put_cstring(ssh,
2100: "no-more-sessions@openssh.com")) != 0 ||
2101: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2102: (r = sshpkt_send(ssh)) != 0)
1.540 ! djm 2103: fatal_fr(r, "send packet");
1.314 djm 2104: }
1.255 reyk 2105:
2106: /* Execute a local command */
2107: if (options.local_command != NULL &&
2108: options.permit_local_command)
2109: ssh_local_cmd(options.local_command);
1.467 djm 2110:
2111: /*
2112: * stdout is now owned by the session channel; clobber it here
2113: * so future channel closes are propagated to the local fd.
2114: * NB. this can only happen after LocalCommand has completed,
2115: * as it may want to write to stdout.
2116: */
1.537 djm 2117: if (!need_controlpersist_detach && stdfd_devnull(0, 1, 0) == -1)
1.540 ! djm 2118: error_f("stdfd_devnull failed");
1.301 djm 2119:
1.342 djm 2120: /*
2121: * If requested and we are not interested in replies to remote
2122: * forwarding requests, then let ssh continue in the background.
2123: */
1.344 djm 2124: if (fork_after_authentication_flag) {
2125: if (options.exit_on_forward_failure &&
2126: options.num_remote_forwards > 0) {
2127: debug("deferring postauth fork until remote forward "
2128: "confirmation received");
2129: } else
2130: fork_postauth();
1.318 djm 2131: }
1.31 markus 2132:
1.463 djm 2133: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 2134: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 2135: }
2136:
1.426 djm 2137: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 2138: static void
1.466 djm 2139: load_public_identity_files(struct passwd *pw)
1.104 markus 2140: {
1.466 djm 2141: char *filename, *cp;
1.460 markus 2142: struct sshkey *public;
1.426 djm 2143: int i;
2144: u_int n_ids, n_certs;
1.335 djm 2145: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 2146: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 2147: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 2148: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2149: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 2150: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2151: #ifdef ENABLE_PKCS11
1.514 djm 2152: struct sshkey **keys = NULL;
2153: char **comments = NULL;
1.333 markus 2154: int nkeys;
1.335 djm 2155: #endif /* PKCS11 */
1.104 markus 2156:
1.426 djm 2157: n_ids = n_certs = 0;
1.398 tedu 2158: memset(identity_files, 0, sizeof(identity_files));
2159: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 2160: memset(identity_file_userprovided, 0,
2161: sizeof(identity_file_userprovided));
1.426 djm 2162: memset(certificate_files, 0, sizeof(certificate_files));
2163: memset(certificates, 0, sizeof(certificates));
1.484 djm 2164: memset(certificate_file_userprovided, 0,
2165: sizeof(certificate_file_userprovided));
1.335 djm 2166:
2167: #ifdef ENABLE_PKCS11
1.333 markus 2168: if (options.pkcs11_provider != NULL &&
1.167 markus 2169: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2170: (pkcs11_init(!options.batch_mode) == 0) &&
2171: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1.514 djm 2172: &keys, &comments)) > 0) {
1.333 markus 2173: for (i = 0; i < nkeys; i++) {
1.335 djm 2174: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 2175: sshkey_free(keys[i]);
1.514 djm 2176: free(comments[i]);
1.335 djm 2177: continue;
2178: }
2179: identity_keys[n_ids] = keys[i];
1.514 djm 2180: identity_files[n_ids] = comments[i]; /* transferred */
1.335 djm 2181: n_ids++;
1.167 markus 2182: }
1.378 djm 2183: free(keys);
1.514 djm 2184: free(comments);
1.127 markus 2185: }
1.333 markus 2186: #endif /* ENABLE_PKCS11 */
1.335 djm 2187: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2188: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2189: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2190: free(options.identity_files[i]);
1.426 djm 2191: options.identity_files[i] = NULL;
1.335 djm 2192: continue;
2193: }
1.490 dtucker 2194: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.528 dtucker 2195: filename = default_client_percent_dollar_expand(cp,
1.527 dtucker 2196: pw->pw_dir, host, options.user, pw->pw_name);
1.378 djm 2197: free(cp);
1.483 markus 2198: check_load(sshkey_load_public(filename, &public, NULL),
2199: filename, "pubkey");
1.131 millert 2200: debug("identity file %s type %d", filename,
2201: public ? public->type : -1);
1.378 djm 2202: free(options.identity_files[i]);
1.335 djm 2203: identity_files[n_ids] = filename;
2204: identity_keys[n_ids] = public;
1.484 djm 2205: identity_file_userprovided[n_ids] =
2206: options.identity_file_userprovided[i];
1.335 djm 2207: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2208: continue;
2209:
1.426 djm 2210: /*
2211: * If no certificates have been explicitly listed then try
2212: * to add the default certificate variant too.
2213: */
2214: if (options.num_certificate_files != 0)
2215: continue;
1.335 djm 2216: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2217: check_load(sshkey_load_public(cp, &public, NULL),
2218: filename, "pubkey");
1.335 djm 2219: debug("identity file %s type %d", cp,
2220: public ? public->type : -1);
2221: if (public == NULL) {
1.378 djm 2222: free(cp);
1.335 djm 2223: continue;
2224: }
1.483 markus 2225: if (!sshkey_is_cert(public)) {
1.540 ! djm 2226: debug_f("key %s type %s is not a certificate",
! 2227: cp, sshkey_type(public));
1.483 markus 2228: sshkey_free(public);
1.378 djm 2229: free(cp);
1.335 djm 2230: continue;
2231: }
1.448 djm 2232: /* NB. leave filename pointing to private key */
2233: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2234: identity_keys[n_ids] = public;
1.484 djm 2235: identity_file_userprovided[n_ids] =
2236: options.identity_file_userprovided[i];
1.335 djm 2237: n_ids++;
2238: }
1.426 djm 2239:
2240: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
1.540 ! djm 2241: fatal_f("too many certificates");
1.426 djm 2242: for (i = 0; i < options.num_certificate_files; i++) {
2243: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2244: getuid());
1.528 dtucker 2245: filename = default_client_percent_dollar_expand(cp,
1.527 dtucker 2246: pw->pw_dir, host, options.user, pw->pw_name);
1.426 djm 2247: free(cp);
2248:
1.483 markus 2249: check_load(sshkey_load_public(filename, &public, NULL),
2250: filename, "certificate");
1.426 djm 2251: debug("certificate file %s type %d", filename,
2252: public ? public->type : -1);
2253: free(options.certificate_files[i]);
2254: options.certificate_files[i] = NULL;
2255: if (public == NULL) {
2256: free(filename);
2257: continue;
2258: }
1.483 markus 2259: if (!sshkey_is_cert(public)) {
1.540 ! djm 2260: debug_f("key %s type %s is not a certificate",
! 2261: filename, sshkey_type(public));
1.483 markus 2262: sshkey_free(public);
1.426 djm 2263: free(filename);
2264: continue;
2265: }
2266: certificate_files[n_certs] = filename;
2267: certificates[n_certs] = public;
1.484 djm 2268: certificate_file_userprovided[n_certs] =
2269: options.certificate_file_userprovided[i];
1.426 djm 2270: ++n_certs;
2271: }
2272:
1.335 djm 2273: options.num_identity_files = n_ids;
2274: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2275: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2276: memcpy(options.identity_file_userprovided,
2277: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2278:
2279: options.num_certificate_files = n_certs;
2280: memcpy(options.certificate_files,
2281: certificate_files, sizeof(certificate_files));
2282: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2283: memcpy(options.certificate_file_userprovided,
2284: certificate_file_userprovided,
2285: sizeof(certificate_file_userprovided));
1.214 djm 2286: }
1.352 djm 2287:
2288: static void
2289: main_sigchld_handler(int sig)
2290: {
2291: int save_errno = errno;
2292: pid_t pid;
2293: int status;
2294:
2295: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.505 deraadt 2296: (pid == -1 && errno == EINTR))
1.352 djm 2297: ;
2298: errno = save_errno;
2299: }
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