Annotation of src/usr.bin/ssh/ssh.c, Revision 1.428
1.428 ! djm 1: /* $OpenBSD: ssh.c,v 1.427 2015/10/15 23:51:40 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: *
19: * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20: * in Canada (German citizen).
21: *
22: * Redistribution and use in source and binary forms, with or without
23: * modification, are permitted provided that the following conditions
24: * are met:
25: * 1. Redistributions of source code must retain the above copyright
26: * notice, this list of conditions and the following disclaimer.
27: * 2. Redistributions in binary form must reproduce the above copyright
28: * notice, this list of conditions and the following disclaimer in the
29: * documentation and/or other materials provided with the distribution.
30: *
31: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 41: */
1.1 deraadt 42:
1.293 deraadt 43: #include <sys/types.h>
1.312 djm 44: #include <sys/ioctl.h>
45: #include <sys/queue.h>
1.259 stevesk 46: #include <sys/resource.h>
1.280 stevesk 47: #include <sys/socket.h>
1.264 stevesk 48: #include <sys/stat.h>
1.312 djm 49: #include <sys/time.h>
1.352 djm 50: #include <sys/wait.h>
1.258 stevesk 51:
1.265 stevesk 52: #include <ctype.h>
1.285 stevesk 53: #include <errno.h>
1.281 stevesk 54: #include <fcntl.h>
1.286 stevesk 55: #include <netdb.h>
1.258 stevesk 56: #include <paths.h>
1.279 stevesk 57: #include <pwd.h>
1.263 stevesk 58: #include <signal.h>
1.287 stevesk 59: #include <stddef.h>
1.291 stevesk 60: #include <stdio.h>
1.290 stevesk 61: #include <stdlib.h>
1.289 stevesk 62: #include <string.h>
1.288 stevesk 63: #include <unistd.h>
1.414 deraadt 64: #include <limits.h>
1.49 markus 65:
1.402 markus 66: #ifdef WITH_OPENSSL
1.49 markus 67: #include <openssl/evp.h>
1.72 markus 68: #include <openssl/err.h>
1.402 markus 69: #endif
1.1 deraadt 70:
1.293 deraadt 71: #include "xmalloc.h"
1.84 markus 72: #include "ssh.h"
73: #include "ssh1.h"
74: #include "ssh2.h"
1.341 djm 75: #include "canohost.h"
1.84 markus 76: #include "compat.h"
77: #include "cipher.h"
1.405 djm 78: #include "digest.h"
1.1 deraadt 79: #include "packet.h"
80: #include "buffer.h"
1.123 markus 81: #include "channels.h"
1.49 markus 82: #include "key.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"
1.225 dtucker 97: #include "uidswap.h"
1.327 andreas 98: #include "roaming.h"
1.278 stevesk 99: #include "version.h"
1.412 djm 100: #include "ssherr.h"
1.420 djm 101: #include "myproposal.h"
1.49 markus 102:
1.333 markus 103: #ifdef ENABLE_PKCS11
104: #include "ssh-pkcs11.h"
1.137 jakob 105: #endif
1.127 markus 106:
1.49 markus 107: extern char *__progname;
1.1 deraadt 108:
1.316 djm 109: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 110: int debug_flag = 0;
111:
1.359 djm 112: /* Flag indicating whether a tty should be requested */
1.1 deraadt 113: int tty_flag = 0;
114:
1.45 markus 115: /* don't exec a shell */
116: int no_shell_flag = 0;
117:
1.33 markus 118: /*
119: * Flag indicating that nothing should be read from stdin. This can be set
120: * on the command line.
121: */
1.1 deraadt 122: int stdin_null_flag = 0;
123:
1.33 markus 124: /*
1.344 djm 125: * Flag indicating that the current process should be backgrounded and
126: * a new slave launched in the foreground for ControlPersist.
127: */
128: int need_controlpersist_detach = 0;
129:
130: /* Copies of flags for ControlPersist foreground slave */
1.359 djm 131: int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
1.344 djm 132:
133: /*
1.33 markus 134: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 135: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 136: * background.
137: */
1.1 deraadt 138: int fork_after_authentication_flag = 0;
139:
1.331 dtucker 140: /* forward stdio to remote host and port */
141: char *stdio_forward_host = NULL;
142: int stdio_forward_port = 0;
143:
1.33 markus 144: /*
145: * General data structure for command line options and options configurable
146: * in configuration files. See readconf.h.
147: */
1.1 deraadt 148: Options options;
149:
1.139 markus 150: /* optional user configfile */
151: char *config = NULL;
152:
1.33 markus 153: /*
154: * Name of the host we are connecting to. This is the name given on the
155: * command line, or the HostName specified for the user-supplied name in a
156: * configuration file.
157: */
1.1 deraadt 158: char *host;
159:
1.22 provos 160: /* socket address the host resolves to */
1.37 markus 161: struct sockaddr_storage hostaddr;
1.1 deraadt 162:
1.112 markus 163: /* Private host keys. */
1.173 markus 164: Sensitive sensitive_data;
1.1 deraadt 165:
1.10 dugsong 166: /* Original real UID. */
167: uid_t original_real_uid;
1.177 markus 168: uid_t original_effective_uid;
1.1 deraadt 169:
1.45 markus 170: /* command to be executed */
171: Buffer command;
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 */
1.315 djm 177: static int remote_forward_confirms_received = 0;
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,
1.409 jmc 189: "usage: ssh [-1246AaCfGgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
1.375 dtucker 190: " [-D [bind_address:]port] [-E log_file] [-e escape_char]\n"
1.425 jmc 191: " [-F configfile] [-I pkcs11] [-i identity_file] [-L address]\n"
192: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
193: " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
1.395 jmc 194: " [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
1.208 markus 195: );
1.257 dtucker 196: exit(255);
1.1 deraadt 197: }
198:
1.126 itojun 199: static int ssh_session(void);
200: static int ssh_session2(void);
201: static void load_public_identity_files(void);
1.352 djm 202: static void main_sigchld_handler(int);
1.312 djm 203:
204: /* from muxclient.c */
205: void muxclient(const char *);
206: void muxserver_listen(void);
1.45 markus 207:
1.361 djm 208: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
209: static void
210: tilde_expand_paths(char **paths, u_int num_paths)
211: {
212: u_int i;
213: char *cp;
214:
215: for (i = 0; i < num_paths; i++) {
216: cp = tilde_expand_filename(paths[i], original_real_uid);
1.378 djm 217: free(paths[i]);
1.361 djm 218: paths[i] = cp;
219: }
220: }
221:
1.400 djm 222: /*
223: * Attempt to resolve a host name / port to a set of addresses and
224: * optionally return any CNAMEs encountered along the way.
225: * Returns NULL on failure.
226: * NB. this function must operate with a options having undefined members.
227: */
1.385 djm 228: static struct addrinfo *
1.400 djm 229: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 230: {
231: char strport[NI_MAXSERV];
232: struct addrinfo hints, *res;
233: int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1;
234:
1.400 djm 235: if (port <= 0)
236: port = default_ssh_port();
237:
1.427 djm 238: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 239: memset(&hints, 0, sizeof(hints));
1.400 djm 240: hints.ai_family = options.address_family == -1 ?
241: AF_UNSPEC : options.address_family;
1.385 djm 242: hints.ai_socktype = SOCK_STREAM;
243: if (cname != NULL)
244: hints.ai_flags = AI_CANONNAME;
245: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
246: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
247: loglevel = SYSLOG_LEVEL_ERROR;
248: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
249: __progname, name, ssh_gai_strerror(gaierr));
250: return NULL;
251: }
252: if (cname != NULL && res->ai_canonname != NULL) {
253: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
254: error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
255: __func__, name, res->ai_canonname, (u_long)clen);
256: if (clen > 0)
257: *cname = '\0';
258: }
259: }
260: return res;
261: }
262:
263: /*
1.413 djm 264: * Attempt to resolve a numeric host address / port to a single address.
265: * Returns a canonical address string.
266: * Returns NULL on failure.
267: * NB. this function must operate with a options having undefined members.
268: */
269: static struct addrinfo *
270: resolve_addr(const char *name, int port, char *caddr, size_t clen)
271: {
272: char addr[NI_MAXHOST], strport[NI_MAXSERV];
273: struct addrinfo hints, *res;
274: int gaierr;
275:
276: if (port <= 0)
277: port = default_ssh_port();
278: snprintf(strport, sizeof strport, "%u", port);
279: memset(&hints, 0, sizeof(hints));
280: hints.ai_family = options.address_family == -1 ?
281: AF_UNSPEC : options.address_family;
282: hints.ai_socktype = SOCK_STREAM;
283: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
284: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
285: debug2("%s: could not resolve name %.100s as address: %s",
286: __func__, name, ssh_gai_strerror(gaierr));
287: return NULL;
288: }
289: if (res == NULL) {
290: debug("%s: getaddrinfo %.100s returned no addresses",
291: __func__, name);
292: return NULL;
293: }
294: if (res->ai_next != NULL) {
295: debug("%s: getaddrinfo %.100s returned multiple addresses",
296: __func__, name);
297: goto fail;
298: }
299: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
300: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
301: debug("%s: Could not format address for name %.100s: %s",
302: __func__, name, ssh_gai_strerror(gaierr));
303: goto fail;
304: }
305: if (strlcpy(caddr, addr, clen) >= clen) {
306: error("%s: host \"%s\" addr \"%s\" too long (max %lu)",
307: __func__, name, addr, (u_long)clen);
308: if (clen > 0)
309: *caddr = '\0';
310: fail:
311: freeaddrinfo(res);
312: return NULL;
313: }
314: return res;
315: }
316:
317: /*
1.385 djm 318: * Check whether the cname is a permitted replacement for the hostname
319: * and perform the replacement if it is.
1.400 djm 320: * NB. this function must operate with a options having undefined members.
1.385 djm 321: */
322: static int
323: check_follow_cname(char **namep, const char *cname)
324: {
325: int i;
326: struct allowed_cname *rule;
327:
328: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
329: strcmp(*namep, cname) == 0)
330: return 0;
1.386 djm 331: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 332: return 0;
333: /*
1.386 djm 334: * Don't attempt to canonicalize names that will be interpreted by
1.385 djm 335: * a proxy unless the user specifically requests so.
336: */
1.400 djm 337: if (!option_clear_or_none(options.proxy_command) &&
1.386 djm 338: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 339: return 0;
340: debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
341: for (i = 0; i < options.num_permitted_cnames; i++) {
342: rule = options.permitted_cnames + i;
1.418 djm 343: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
344: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 345: continue;
1.386 djm 346: verbose("Canonicalized DNS aliased hostname "
1.385 djm 347: "\"%s\" => \"%s\"", *namep, cname);
348: free(*namep);
349: *namep = xstrdup(cname);
350: return 1;
351: }
352: return 0;
353: }
354:
355: /*
356: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 357: * canonicalization rules. Returns the address list for the host or NULL
358: * if no name was found after canonicalization.
1.400 djm 359: * NB. this function must operate with a options having undefined members.
1.385 djm 360: */
361: static struct addrinfo *
1.400 djm 362: resolve_canonicalize(char **hostp, int port)
1.385 djm 363: {
364: int i, ndots;
1.413 djm 365: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 366: struct addrinfo *addrs;
367:
1.386 djm 368: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 369: return NULL;
1.400 djm 370:
1.385 djm 371: /*
1.386 djm 372: * Don't attempt to canonicalize names that will be interpreted by
1.385 djm 373: * a proxy unless the user specifically requests so.
374: */
1.400 djm 375: if (!option_clear_or_none(options.proxy_command) &&
1.386 djm 376: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 377: return NULL;
1.400 djm 378:
1.413 djm 379: /* Try numeric hostnames first */
380: if ((addrs = resolve_addr(*hostp, port,
381: newname, sizeof(newname))) != NULL) {
382: debug2("%s: hostname %.100s is address", __func__, *hostp);
383: if (strcasecmp(*hostp, newname) != 0) {
384: debug2("%s: canonicalised address \"%s\" => \"%s\"",
385: __func__, *hostp, newname);
386: free(*hostp);
387: *hostp = xstrdup(newname);
388: }
389: return addrs;
390: }
391:
1.428 ! djm 392: /* If domain name is anchored, then resolve it now */
! 393: if ((*hostp)[strlen(*hostp) - 1] == '.') {
! 394: debug3("%s: name is fully qualified", __func__);
! 395: fullhost = xstrdup(*hostp);
! 396: if ((addrs = resolve_host(fullhost, port, 0,
! 397: newname, sizeof(newname))) != NULL)
! 398: goto found;
! 399: free(fullhost);
! 400: goto notfound;
! 401: }
! 402:
1.387 djm 403: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 404: ndots = 0;
405: for (cp = *hostp; *cp != '\0'; cp++) {
406: if (*cp == '.')
407: ndots++;
408: }
1.386 djm 409: if (ndots > options.canonicalize_max_dots) {
410: debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
411: __func__, *hostp, options.canonicalize_max_dots);
1.385 djm 412: return NULL;
413: }
414: /* Attempt each supplied suffix */
415: for (i = 0; i < options.num_canonical_domains; i++) {
1.413 djm 416: *newname = '\0';
1.385 djm 417: xasprintf(&fullhost, "%s.%s.", *hostp,
418: options.canonical_domains[i]);
1.400 djm 419: debug3("%s: attempting \"%s\" => \"%s\"", __func__,
420: *hostp, fullhost);
421: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 422: newname, sizeof(newname))) == NULL) {
1.385 djm 423: free(fullhost);
424: continue;
425: }
1.428 ! djm 426: found:
1.385 djm 427: /* Remove trailing '.' */
428: fullhost[strlen(fullhost) - 1] = '\0';
429: /* Follow CNAME if requested */
1.413 djm 430: if (!check_follow_cname(&fullhost, newname)) {
1.386 djm 431: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 432: *hostp, fullhost);
433: }
434: free(*hostp);
435: *hostp = fullhost;
436: return addrs;
437: }
1.428 ! djm 438: notfound:
1.386 djm 439: if (!options.canonicalize_fallback_local)
1.400 djm 440: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
441: debug2("%s: host %s not found in any suffix", __func__, *hostp);
1.385 djm 442: return NULL;
443: }
444:
1.32 deraadt 445: /*
1.400 djm 446: * Read per-user configuration file. Ignore the system wide config
447: * file if the user specifies a config file on the command line.
448: */
449: static void
1.408 djm 450: process_config_files(const char *host_arg, struct passwd *pw, int post_canon)
1.400 djm 451: {
1.414 deraadt 452: char buf[PATH_MAX];
1.400 djm 453: int r;
454:
455: if (config != NULL) {
456: if (strcasecmp(config, "none") != 0 &&
1.408 djm 457: !read_config_file(config, pw, host, host_arg, &options,
458: SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0)))
1.400 djm 459: fatal("Can't open user config file %.100s: "
460: "%.100s", config, strerror(errno));
461: } else {
462: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
463: _PATH_SSH_USER_CONFFILE);
464: if (r > 0 && (size_t)r < sizeof(buf))
1.408 djm 465: (void)read_config_file(buf, pw, host, host_arg,
466: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
467: (post_canon ? SSHCONF_POSTCANON : 0));
1.400 djm 468:
469: /* Read systemwide configuration file after user config. */
1.408 djm 470: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
471: host, host_arg, &options,
472: post_canon ? SSHCONF_POSTCANON : 0);
473: }
474: }
475:
476: /* Rewrite the port number in an addrinfo list of addresses */
477: static void
478: set_addrinfo_port(struct addrinfo *addrs, int port)
479: {
480: struct addrinfo *addr;
481:
482: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
483: switch (addr->ai_family) {
484: case AF_INET:
485: ((struct sockaddr_in *)addr->ai_addr)->
486: sin_port = htons(port);
487: break;
488: case AF_INET6:
489: ((struct sockaddr_in6 *)addr->ai_addr)->
490: sin6_port = htons(port);
491: break;
492: }
1.400 djm 493: }
494: }
495:
496: /*
1.32 deraadt 497: * Main program for the ssh client.
498: */
1.2 provos 499: int
500: main(int ac, char **av)
1.1 deraadt 501: {
1.408 djm 502: int i, r, opt, exit_status, use_syslog, config_test = 0;
1.414 deraadt 503: char *p, *cp, *line, *argv0, buf[PATH_MAX], *host_arg, *logfile;
1.358 djm 504: char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
1.423 djm 505: char cname[NI_MAXHOST], uidstr[32], *conn_hash_hex;
1.31 markus 506: struct stat st;
1.98 markus 507: struct passwd *pw;
1.382 djm 508: int timeout_ms;
1.144 stevesk 509: extern int optind, optreset;
510: extern char *optarg;
1.406 millert 511: struct Forward fwd;
1.385 djm 512: struct addrinfo *addrs = NULL;
1.405 djm 513: struct ssh_digest_ctx *md;
514: u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
1.250 djm 515:
516: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
517: sanitise_stdfd();
1.31 markus 518:
1.33 markus 519: /*
1.346 djm 520: * Discard other fds that are hanging around. These can cause problem
521: * with backgrounded ssh processes started by ControlPersist.
522: */
523: closefrom(STDERR_FILENO + 1);
524:
525: /*
1.33 markus 526: * Save the original real uid. It will be needed later (uid-swapping
527: * may clobber the real uid).
528: */
1.31 markus 529: original_real_uid = getuid();
530: original_effective_uid = geteuid();
531:
1.184 stevesk 532: /*
533: * Use uid-swapping to give up root privileges for the duration of
534: * option processing. We will re-instantiate the rights when we are
535: * ready to create the privileged port, and will permanently drop
536: * them when the port has been created (actually, when the connection
537: * has been made, as we may need to create the port several times).
538: */
539: PRIV_END;
540:
1.31 markus 541: /* If we are installed setuid root be careful to not drop core. */
542: if (original_real_uid != original_effective_uid) {
543: struct rlimit rlim;
544: rlim.rlim_cur = rlim.rlim_max = 0;
545: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
546: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 547: }
1.107 markus 548: /* Get user data. */
549: pw = getpwuid(original_real_uid);
550: if (!pw) {
1.380 djm 551: logit("No user exists for uid %lu", (u_long)original_real_uid);
1.257 dtucker 552: exit(255);
1.107 markus 553: }
554: /* Take a copy of the returned structure. */
555: pw = pwcopy(pw);
1.31 markus 556:
1.33 markus 557: /*
558: * Set our umask to something reasonable, as some files are created
559: * with the default umask. This will make them world-readable but
560: * writable only by the owner, which is ok for all files for which we
561: * don't set the modes explicitly.
562: */
1.31 markus 563: umask(022);
564:
1.316 djm 565: /*
566: * Initialize option structure to indicate that no values have been
567: * set.
568: */
1.31 markus 569: initialize_options(&options);
570:
571: /* Parse command-line arguments. */
572: host = NULL;
1.320 djm 573: use_syslog = 0;
1.375 dtucker 574: logfile = NULL;
1.325 markus 575: argv0 = av[0];
1.31 markus 576:
1.266 djm 577: again:
1.316 djm 578: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.408 djm 579: "ACD:E:F:GI:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 580: switch (opt) {
1.91 jakob 581: case '1':
582: options.protocol = SSH_PROTO_1;
583: break;
1.47 markus 584: case '2':
585: options.protocol = SSH_PROTO_2;
586: break;
1.37 markus 587: case '4':
1.196 djm 588: options.address_family = AF_INET;
1.37 markus 589: break;
590: case '6':
1.196 djm 591: options.address_family = AF_INET6;
1.37 markus 592: break;
1.31 markus 593: case 'n':
594: stdin_null_flag = 1;
595: break;
596: case 'f':
597: fork_after_authentication_flag = 1;
598: stdin_null_flag = 1;
599: break;
600: case 'x':
601: options.forward_x11 = 0;
602: break;
603: case 'X':
604: options.forward_x11 = 1;
605: break;
1.320 djm 606: case 'y':
607: use_syslog = 1;
608: break;
1.375 dtucker 609: case 'E':
1.422 dtucker 610: logfile = optarg;
1.375 dtucker 611: break;
1.408 djm 612: case 'G':
613: config_test = 1;
614: break;
1.202 markus 615: case 'Y':
616: options.forward_x11 = 1;
617: options.forward_x11_trusted = 1;
618: break;
1.31 markus 619: case 'g':
1.406 millert 620: options.fwd_opts.gateway_ports = 1;
1.31 markus 621: break;
1.229 djm 622: case 'O':
1.332 djm 623: if (stdio_forward_host != NULL)
624: fatal("Cannot specify multiplexing "
625: "command with -W");
626: else if (muxclient_command != 0)
627: fatal("Multiplexing command already specified");
1.229 djm 628: if (strcmp(optarg, "check") == 0)
1.312 djm 629: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 630: else if (strcmp(optarg, "forward") == 0)
631: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 632: else if (strcmp(optarg, "exit") == 0)
1.312 djm 633: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 634: else if (strcmp(optarg, "stop") == 0)
635: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 636: else if (strcmp(optarg, "cancel") == 0)
637: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.229 djm 638: else
639: fatal("Invalid multiplex command.");
640: break;
1.183 stevesk 641: case 'P': /* deprecated */
1.31 markus 642: options.use_privileged_port = 0;
1.376 djm 643: break;
1.394 deraadt 644: case 'Q':
1.376 djm 645: cp = NULL;
1.394 deraadt 646: if (strcmp(optarg, "cipher") == 0)
1.393 djm 647: cp = cipher_alg_list('\n', 0);
1.394 deraadt 648: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 649: cp = cipher_alg_list('\n', 1);
1.394 deraadt 650: else if (strcmp(optarg, "mac") == 0)
1.392 dtucker 651: cp = mac_alg_list('\n');
1.394 deraadt 652: else if (strcmp(optarg, "kex") == 0)
1.392 dtucker 653: cp = kex_alg_list('\n');
1.394 deraadt 654: else if (strcmp(optarg, "key") == 0)
1.396 markus 655: cp = key_alg_list(0, 0);
656: else if (strcmp(optarg, "key-cert") == 0)
657: cp = key_alg_list(1, 0);
658: else if (strcmp(optarg, "key-plain") == 0)
659: cp = key_alg_list(0, 1);
1.416 djm 660: else if (strcmp(optarg, "protocol-version") == 0) {
661: #ifdef WITH_SSH1
662: cp = xstrdup("1\n2");
663: #else
664: cp = xstrdup("2");
665: #endif
666: }
1.376 djm 667: if (cp == NULL)
668: fatal("Unsupported query \"%s\"", optarg);
669: printf("%s\n", cp);
670: free(cp);
671: exit(0);
1.31 markus 672: break;
673: case 'a':
674: options.forward_agent = 0;
1.53 markus 675: break;
676: case 'A':
677: options.forward_agent = 1;
1.31 markus 678: break;
679: case 'k':
1.204 dtucker 680: options.gss_deleg_creds = 0;
1.297 djm 681: break;
682: case 'K':
683: options.gss_authentication = 1;
684: options.gss_deleg_creds = 1;
1.31 markus 685: break;
686: case 'i':
687: if (stat(optarg, &st) < 0) {
1.128 fgsch 688: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 689: "not accessible: %s.\n", optarg,
690: strerror(errno));
1.31 markus 691: break;
692: }
1.371 dtucker 693: add_identity_file(&options, NULL, optarg, 1);
1.31 markus 694: break;
1.127 markus 695: case 'I':
1.333 markus 696: #ifdef ENABLE_PKCS11
1.422 dtucker 697: free(options.pkcs11_provider);
1.333 markus 698: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 699: #else
1.333 markus 700: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 701: #endif
1.127 markus 702: break;
1.31 markus 703: case 't':
1.359 djm 704: if (options.request_tty == REQUEST_TTY_YES)
705: options.request_tty = REQUEST_TTY_FORCE;
706: else
707: options.request_tty = REQUEST_TTY_YES;
1.31 markus 708: break;
709: case 'v':
1.197 markus 710: if (debug_flag == 0) {
1.66 markus 711: debug_flag = 1;
712: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 713: } else {
714: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
715: options.log_level++;
716: }
1.375 dtucker 717: break;
1.31 markus 718: case 'V':
1.209 markus 719: fprintf(stderr, "%s, %s\n",
1.402 markus 720: SSH_VERSION,
721: #ifdef WITH_OPENSSL
722: SSLeay_version(SSLEAY_VERSION)
723: #else
724: "without OpenSSL"
725: #endif
726: );
1.31 markus 727: if (opt == 'V')
728: exit(0);
729: break;
1.255 reyk 730: case 'w':
1.256 reyk 731: if (options.tun_open == -1)
732: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 733: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 734: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 735: fprintf(stderr,
736: "Bad tun device '%s'\n", optarg);
1.257 dtucker 737: exit(255);
1.255 reyk 738: }
739: break;
1.331 dtucker 740: case 'W':
1.332 djm 741: if (stdio_forward_host != NULL)
742: fatal("stdio forward already specified");
743: if (muxclient_command != 0)
744: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 745: if (parse_forward(&fwd, optarg, 1, 0)) {
746: stdio_forward_host = fwd.listen_host;
747: stdio_forward_port = fwd.listen_port;
1.378 djm 748: free(fwd.connect_host);
1.331 dtucker 749: } else {
750: fprintf(stderr,
751: "Bad stdio forwarding specification '%s'\n",
752: optarg);
753: exit(255);
754: }
1.359 djm 755: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 756: no_shell_flag = 1;
757: options.clear_forwardings = 1;
758: options.exit_on_forward_failure = 1;
759: break;
1.31 markus 760: case 'q':
761: options.log_level = SYSLOG_LEVEL_QUIET;
762: break;
763: case 'e':
764: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 765: (u_char) optarg[1] >= 64 &&
766: (u_char) optarg[1] < 128)
1.78 markus 767: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 768: else if (strlen(optarg) == 1)
1.78 markus 769: options.escape_char = (u_char) optarg[0];
1.31 markus 770: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 771: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 772: else {
1.128 fgsch 773: fprintf(stderr, "Bad escape character '%s'.\n",
774: optarg);
1.257 dtucker 775: exit(255);
1.31 markus 776: }
777: break;
778: case 'c':
1.420 djm 779: if (ciphers_valid(*optarg == '+' ?
780: optarg + 1 : optarg)) {
1.49 markus 781: /* SSH2 only */
1.422 dtucker 782: free(options.ciphers);
1.49 markus 783: options.ciphers = xstrdup(optarg);
1.224 markus 784: options.cipher = SSH_CIPHER_INVALID;
1.420 djm 785: break;
786: }
787: /* SSH1 only */
788: options.cipher = cipher_number(optarg);
789: if (options.cipher == -1) {
790: fprintf(stderr, "Unknown cipher type '%s'\n",
791: optarg);
792: exit(255);
1.95 markus 793: }
1.420 djm 794: if (options.cipher == SSH_CIPHER_3DES)
795: options.ciphers = xstrdup("3des-cbc");
796: else if (options.cipher == SSH_CIPHER_BLOWFISH)
797: options.ciphers = xstrdup("blowfish-cbc");
798: else
799: options.ciphers = xstrdup(KEX_CLIENT_ENCRYPT);
1.95 markus 800: break;
801: case 'm':
1.422 dtucker 802: if (mac_valid(optarg)) {
803: free(options.macs);
1.95 markus 804: options.macs = xstrdup(optarg);
1.422 dtucker 805: } else {
1.128 fgsch 806: fprintf(stderr, "Unknown mac type '%s'\n",
807: optarg);
1.257 dtucker 808: exit(255);
1.31 markus 809: }
810: break;
1.214 djm 811: case 'M':
1.242 djm 812: if (options.control_master == SSHCTL_MASTER_YES)
813: options.control_master = SSHCTL_MASTER_ASK;
814: else
815: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 816: break;
1.31 markus 817: case 'p':
1.113 stevesk 818: options.port = a2port(optarg);
1.323 djm 819: if (options.port <= 0) {
1.109 markus 820: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 821: exit(255);
1.109 markus 822: }
1.31 markus 823: break;
824: case 'l':
825: options.user = optarg;
826: break;
1.141 stevesk 827:
828: case 'L':
1.324 djm 829: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 830: add_local_forward(&options, &fwd);
831: else {
1.128 fgsch 832: fprintf(stderr,
1.232 djm 833: "Bad local forwarding specification '%s'\n",
1.128 fgsch 834: optarg);
1.257 dtucker 835: exit(255);
1.31 markus 836: }
1.232 djm 837: break;
838:
839: case 'R':
1.324 djm 840: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 841: add_remote_forward(&options, &fwd);
842: } else {
1.128 fgsch 843: fprintf(stderr,
1.232 djm 844: "Bad remote forwarding specification "
845: "'%s'\n", optarg);
1.257 dtucker 846: exit(255);
1.31 markus 847: }
848: break;
1.108 markus 849:
850: case 'D':
1.324 djm 851: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 852: add_local_forward(&options, &fwd);
1.232 djm 853: } else {
1.322 stevesk 854: fprintf(stderr,
855: "Bad dynamic forwarding specification "
856: "'%s'\n", optarg);
1.257 dtucker 857: exit(255);
1.109 markus 858: }
1.108 markus 859: break;
860:
1.31 markus 861: case 'C':
862: options.compression = 1;
863: break;
1.45 markus 864: case 'N':
865: no_shell_flag = 1;
1.359 djm 866: options.request_tty = REQUEST_TTY_NO;
1.45 markus 867: break;
868: case 'T':
1.359 djm 869: options.request_tty = REQUEST_TTY_NO;
1.45 markus 870: break;
1.31 markus 871: case 'o':
1.205 markus 872: line = xstrdup(optarg);
1.408 djm 873: if (process_config_line(&options, pw,
874: host ? host : "", host ? host : "", line,
875: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 876: exit(255);
1.378 djm 877: free(line);
1.31 markus 878: break;
1.85 djm 879: case 's':
880: subsystem_flag = 1;
1.117 markus 881: break;
1.214 djm 882: case 'S':
883: if (options.control_path != NULL)
884: free(options.control_path);
885: options.control_path = xstrdup(optarg);
886: break;
1.117 markus 887: case 'b':
888: options.bind_address = optarg;
1.85 djm 889: break;
1.139 markus 890: case 'F':
891: config = optarg;
892: break;
1.31 markus 893: default:
894: usage();
1.1 deraadt 895: }
1.31 markus 896: }
897:
1.128 fgsch 898: ac -= optind;
899: av += optind;
900:
1.329 guenther 901: if (ac > 0 && !host) {
1.188 markus 902: if (strrchr(*av, '@')) {
1.128 fgsch 903: p = xstrdup(*av);
1.188 markus 904: cp = strrchr(p, '@');
1.128 fgsch 905: if (cp == NULL || cp == p)
906: usage();
907: options.user = p;
908: *cp = '\0';
1.385 djm 909: host = xstrdup(++cp);
1.128 fgsch 910: } else
1.385 djm 911: host = xstrdup(*av);
1.189 millert 912: if (ac > 1) {
913: optind = optreset = 1;
1.128 fgsch 914: goto again;
915: }
1.189 millert 916: ac--, av++;
1.128 fgsch 917: }
918:
1.31 markus 919: /* Check that we got a host name. */
920: if (!host)
921: usage();
922:
1.385 djm 923: host_arg = xstrdup(host);
924:
1.402 markus 925: #ifdef WITH_OPENSSL
1.350 djm 926: OpenSSL_add_all_algorithms();
1.72 markus 927: ERR_load_crypto_strings();
1.402 markus 928: #endif
1.31 markus 929:
930: /* Initialize the command to execute on remote host. */
931: buffer_init(&command);
1.1 deraadt 932:
1.33 markus 933: /*
934: * Save the command to execute on the remote host in a buffer. There
935: * is no limit on the length of the command, except by the maximum
936: * packet size. Also sets the tty flag if there is no command.
937: */
1.128 fgsch 938: if (!ac) {
1.31 markus 939: /* No command specified - execute shell on a tty. */
1.85 djm 940: if (subsystem_flag) {
1.128 fgsch 941: fprintf(stderr,
942: "You must specify a subsystem to invoke.\n");
1.85 djm 943: usage();
944: }
1.31 markus 945: } else {
1.128 fgsch 946: /* A command has been specified. Store it into the buffer. */
947: for (i = 0; i < ac; i++) {
948: if (i)
1.31 markus 949: buffer_append(&command, " ", 1);
950: buffer_append(&command, av[i], strlen(av[i]));
951: }
952: }
953:
954: /* Cannot fork to background if no command. */
1.316 djm 955: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
956: !no_shell_flag)
957: fatal("Cannot fork into background without a command "
958: "to execute.");
1.31 markus 959:
1.101 markus 960: /*
961: * Initialize "log" output. Since we are the client all output
1.375 dtucker 962: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 963: */
1.375 dtucker 964: if (use_syslog && logfile != NULL)
965: fatal("Can't specify both -y and -E");
1.422 dtucker 966: if (logfile != NULL)
1.375 dtucker 967: log_redirect_stderr_to(logfile);
1.325 markus 968: log_init(argv0,
1.316 djm 969: options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
1.320 djm 970: SYSLOG_FACILITY_USER, !use_syslog);
1.375 dtucker 971:
972: if (debug_flag)
1.402 markus 973: logit("%s, %s", SSH_VERSION,
974: #ifdef WITH_OPENSSL
975: SSLeay_version(SSLEAY_VERSION)
976: #else
977: "without OpenSSL"
978: #endif
979: );
1.31 markus 980:
1.400 djm 981: /* Parse the configuration files */
1.408 djm 982: process_config_files(host_arg, pw, 0);
1.400 djm 983:
984: /* Hostname canonicalisation needs a few options filled. */
985: fill_default_options_for_canonicalization(&options);
986:
987: /* If the user has replaced the hostname then take it into use now */
988: if (options.hostname != NULL) {
989: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
990: cp = percent_expand(options.hostname,
991: "h", host, (char *)NULL);
992: free(host);
993: host = cp;
1.408 djm 994: free(options.hostname);
995: options.hostname = xstrdup(host);
1.400 djm 996: }
997:
998: /* If canonicalization requested then try to apply it */
999: lowercase(host);
1000: if (options.canonicalize_hostname != SSH_CANONICALISE_NO)
1001: addrs = resolve_canonicalize(&host, options.port);
1002:
1.139 markus 1003: /*
1.401 djm 1004: * If CanonicalizePermittedCNAMEs have been specified but
1005: * other canonicalization did not happen (by not being requested
1006: * or by failing with fallback) then the hostname may still be changed
1007: * as a result of CNAME following.
1008: *
1009: * Try to resolve the bare hostname name using the system resolver's
1010: * usual search rules and then apply the CNAME follow rules.
1011: *
1012: * Skip the lookup if a ProxyCommand is being used unless the user
1013: * has specifically requested canonicalisation for this case via
1014: * CanonicalizeHostname=always
1.139 markus 1015: */
1.401 djm 1016: if (addrs == NULL && options.num_permitted_cnames != 0 &&
1017: (option_clear_or_none(options.proxy_command) ||
1.400 djm 1018: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1019: if ((addrs = resolve_host(host, options.port,
1020: option_clear_or_none(options.proxy_command),
1021: cname, sizeof(cname))) == NULL) {
1022: /* Don't fatal proxied host names not in the DNS */
1023: if (option_clear_or_none(options.proxy_command))
1024: cleanup_exit(255); /* logged in resolve_host */
1025: } else
1026: check_follow_cname(&host, cname);
1.400 djm 1027: }
1.139 markus 1028:
1.400 djm 1029: /*
1.408 djm 1030: * If canonicalisation is enabled then re-parse the configuration
1031: * files as new stanzas may match.
1.400 djm 1032: */
1.408 djm 1033: if (options.canonicalize_hostname != 0) {
1034: debug("Re-reading configuration after hostname "
1035: "canonicalisation");
1036: free(options.hostname);
1037: options.hostname = xstrdup(host);
1038: process_config_files(host_arg, pw, 1);
1039: /*
1040: * Address resolution happens early with canonicalisation
1041: * enabled and the port number may have changed since, so
1042: * reset it in address list
1043: */
1044: if (addrs != NULL && options.port > 0)
1045: set_addrinfo_port(addrs, options.port);
1.139 markus 1046: }
1.31 markus 1047:
1048: /* Fill configuration defaults. */
1049: fill_default_options(&options);
1050:
1.400 djm 1051: if (options.port == 0)
1052: options.port = default_ssh_port();
1.196 djm 1053: channel_set_af(options.address_family);
1054:
1.383 djm 1055: /* Tidy and check options */
1056: if (options.host_key_alias != NULL)
1057: lowercase(options.host_key_alias);
1058: if (options.proxy_command != NULL &&
1059: strcmp(options.proxy_command, "-") == 0 &&
1060: options.proxy_use_fdpass)
1061: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.415 djm 1062: if (options.control_persist &&
1063: options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1064: debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1065: "disabling");
1066: options.update_hostkeys = 0;
1067: }
1.388 djm 1068: if (original_effective_uid != 0)
1069: options.use_privileged_port = 0;
1.383 djm 1070:
1.31 markus 1071: /* reinit */
1.325 markus 1072: log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
1.370 djm 1073:
1074: if (options.request_tty == REQUEST_TTY_YES ||
1075: options.request_tty == REQUEST_TTY_FORCE)
1076: tty_flag = 1;
1077:
1078: /* Allocate a tty by default if no command specified. */
1079: if (buffer_len(&command) == 0)
1080: tty_flag = options.request_tty != REQUEST_TTY_NO;
1081:
1082: /* Force no tty */
1083: if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
1084: tty_flag = 0;
1085: /* Do not allocate a tty if stdin is not a tty. */
1086: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1087: options.request_tty != REQUEST_TTY_FORCE) {
1088: if (tty_flag)
1089: logit("Pseudo-terminal will not be allocated because "
1090: "stdin is not a terminal.");
1091: tty_flag = 0;
1092: }
1.31 markus 1093:
1094: if (options.user == NULL)
1095: options.user = xstrdup(pw->pw_name);
1.343 djm 1096:
1.358 djm 1097: if (gethostname(thishost, sizeof(thishost)) == -1)
1098: fatal("gethostname: %s", strerror(errno));
1099: strlcpy(shorthost, thishost, sizeof(shorthost));
1100: shorthost[strcspn(thishost, ".")] = '\0';
1101: snprintf(portstr, sizeof(portstr), "%d", options.port);
1.423 djm 1102: snprintf(uidstr, sizeof(uidstr), "%d", pw->pw_uid);
1.358 djm 1103:
1.405 djm 1104: if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1105: ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1106: ssh_digest_update(md, host, strlen(host)) < 0 ||
1107: ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1108: ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1109: ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1110: fatal("%s: mux digest failed", __func__);
1111: ssh_digest_free(md);
1112: conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1113:
1.317 dtucker 1114: if (options.local_command != NULL) {
1115: debug3("expanding LocalCommand: %s", options.local_command);
1116: cp = options.local_command;
1.405 djm 1117: options.local_command = percent_expand(cp,
1118: "C", conn_hash_hex,
1119: "L", shorthost,
1120: "d", pw->pw_dir,
1121: "h", host,
1122: "l", thishost,
1123: "n", host_arg,
1124: "p", portstr,
1125: "r", options.user,
1126: "u", pw->pw_name,
1.358 djm 1127: (char *)NULL);
1.317 dtucker 1128: debug3("expanded LocalCommand: %s", options.local_command);
1.378 djm 1129: free(cp);
1.304 dtucker 1130: }
1.31 markus 1131:
1.214 djm 1132: if (options.control_path != NULL) {
1.241 djm 1133: cp = tilde_expand_filename(options.control_path,
1134: original_real_uid);
1.378 djm 1135: free(options.control_path);
1.405 djm 1136: options.control_path = percent_expand(cp,
1137: "C", conn_hash_hex,
1138: "L", shorthost,
1139: "h", host,
1140: "l", thishost,
1141: "n", host_arg,
1142: "p", portstr,
1143: "r", options.user,
1144: "u", pw->pw_name,
1.423 djm 1145: "i", uidstr,
1.358 djm 1146: (char *)NULL);
1.378 djm 1147: free(cp);
1.214 djm 1148: }
1.405 djm 1149: free(conn_hash_hex);
1.408 djm 1150:
1151: if (config_test) {
1152: dump_client_config(&options, host);
1153: exit(0);
1154: }
1.405 djm 1155:
1.312 djm 1156: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1157: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 1158: if (options.control_path != NULL)
1.312 djm 1159: muxclient(options.control_path);
1.401 djm 1160:
1161: /*
1162: * If hostname canonicalisation was not enabled, then we may not
1163: * have yet resolved the hostname. Do so now.
1164: */
1165: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1166: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1167: if ((addrs = resolve_host(host, options.port, 1,
1168: cname, sizeof(cname))) == NULL)
1169: cleanup_exit(255); /* resolve_host logs the error */
1170: }
1.214 djm 1171:
1.303 djm 1172: timeout_ms = options.connection_timeout * 1000;
1173:
1.77 markus 1174: /* Open a connection to the remote host. */
1.385 djm 1175: if (ssh_connect(host, addrs, &hostaddr, options.port,
1176: options.address_family, options.connection_attempts,
1177: &timeout_ms, options.tcp_keep_alive,
1.388 djm 1178: options.use_privileged_port) != 0)
1.257 dtucker 1179: exit(255);
1.31 markus 1180:
1.391 djm 1181: if (addrs != NULL)
1182: freeaddrinfo(addrs);
1183:
1.385 djm 1184: packet_set_timeout(options.server_alive_interval,
1185: options.server_alive_count_max);
1186:
1.303 djm 1187: if (timeout_ms > 0)
1188: debug3("timeout: %d ms remain after connect", timeout_ms);
1189:
1.33 markus 1190: /*
1191: * If we successfully made the connection, load the host private key
1192: * in case we will need it later for combined rsa-rhosts
1193: * authentication. This must be done before releasing extra
1194: * privileges, because the file is only readable by root.
1.174 markus 1195: * If we cannot access the private keys, load the public keys
1196: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 1197: */
1.112 markus 1198: sensitive_data.nkeys = 0;
1199: sensitive_data.keys = NULL;
1.173 markus 1200: sensitive_data.external_keysign = 0;
1.178 markus 1201: if (options.rhosts_rsa_authentication ||
1202: options.hostbased_authentication) {
1.397 djm 1203: sensitive_data.nkeys = 9;
1.274 deraadt 1204: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 1205: sizeof(Key));
1.177 markus 1206:
1207: PRIV_START;
1.112 markus 1208: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 1209: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.411 djm 1210: sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA,
1.349 djm 1211: _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
1.411 djm 1212: sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519,
1213: _PATH_HOST_ED25519_KEY_FILE, "", NULL);
1.349 djm 1214: sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
1.345 djm 1215: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.411 djm 1216: sensitive_data.keys[4] = key_load_private_cert(KEY_DSA,
1217: _PATH_HOST_DSA_KEY_FILE, "", NULL);
1218: sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
1.349 djm 1219: _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1220: sensitive_data.keys[6] = key_load_private_type(KEY_ED25519,
1221: _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
1.397 djm 1222: sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
1.276 dtucker 1223: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1224: sensitive_data.keys[8] = key_load_private_type(KEY_DSA,
1225: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.177 markus 1226: PRIV_END;
1.173 markus 1227:
1.181 markus 1228: if (options.hostbased_authentication == 1 &&
1229: sensitive_data.keys[0] == NULL &&
1.349 djm 1230: sensitive_data.keys[5] == NULL &&
1.396 markus 1231: sensitive_data.keys[6] == NULL &&
1.397 djm 1232: sensitive_data.keys[7] == NULL &&
1233: sensitive_data.keys[8] == NULL) {
1.345 djm 1234: sensitive_data.keys[1] = key_load_cert(
1.411 djm 1235: _PATH_HOST_ECDSA_KEY_FILE);
1.345 djm 1236: sensitive_data.keys[2] = key_load_cert(
1.411 djm 1237: _PATH_HOST_ED25519_KEY_FILE);
1.349 djm 1238: sensitive_data.keys[3] = key_load_cert(
1.345 djm 1239: _PATH_HOST_RSA_KEY_FILE);
1.397 djm 1240: sensitive_data.keys[4] = key_load_cert(
1.411 djm 1241: _PATH_HOST_DSA_KEY_FILE);
1.397 djm 1242: sensitive_data.keys[5] = key_load_public(
1.411 djm 1243: _PATH_HOST_ECDSA_KEY_FILE, NULL);
1.397 djm 1244: sensitive_data.keys[6] = key_load_public(
1.411 djm 1245: _PATH_HOST_ED25519_KEY_FILE, NULL);
1.397 djm 1246: sensitive_data.keys[7] = key_load_public(
1.173 markus 1247: _PATH_HOST_RSA_KEY_FILE, NULL);
1.397 djm 1248: sensitive_data.keys[8] = key_load_public(
1.411 djm 1249: _PATH_HOST_DSA_KEY_FILE, NULL);
1.173 markus 1250: sensitive_data.external_keysign = 1;
1251: }
1.31 markus 1252: }
1.33 markus 1253: /*
1254: * Get rid of any extra privileges that we may have. We will no
1255: * longer need them. Also, extra privileges could make it very hard
1256: * to read identity files and other non-world-readable files from the
1257: * user's home directory if it happens to be on a NFS volume where
1258: * root is mapped to nobody.
1259: */
1.225 dtucker 1260: if (original_effective_uid == 0) {
1261: PRIV_START;
1262: permanently_set_uid(pw);
1263: }
1.31 markus 1264:
1.33 markus 1265: /*
1266: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 1267: * directory if it doesn't already exist.
1.33 markus 1268: */
1.367 djm 1269: if (config == NULL) {
1270: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1271: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1272: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1273: if (mkdir(buf, 0700) < 0)
1274: error("Could not create directory '%.200s'.",
1275: buf);
1276: }
1.31 markus 1277:
1.104 markus 1278: /* load options.identity_files */
1279: load_public_identity_files();
1280:
1281: /* Expand ~ in known host file names. */
1.361 djm 1282: tilde_expand_paths(options.system_hostfiles,
1283: options.num_system_hostfiles);
1284: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1285:
1286: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 1287: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1288:
1.316 djm 1289: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 1290: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1291: options.port, pw, timeout_ms);
1.339 djm 1292:
1293: if (packet_connection_is_on_socket()) {
1294: verbose("Authenticated to %s ([%s]:%d).", host,
1295: get_remote_ipaddr(), get_remote_port());
1296: } else {
1297: verbose("Authenticated to %s (via proxy).", host);
1298: }
1.31 markus 1299:
1.112 markus 1300: /* We no longer need the private host keys. Clear them now. */
1301: if (sensitive_data.nkeys != 0) {
1302: for (i = 0; i < sensitive_data.nkeys; i++) {
1303: if (sensitive_data.keys[i] != NULL) {
1304: /* Destroys contents safely */
1305: debug3("clear hostkey %d", i);
1306: key_free(sensitive_data.keys[i]);
1307: sensitive_data.keys[i] = NULL;
1308: }
1309: }
1.378 djm 1310: free(sensitive_data.keys);
1.134 markus 1311: }
1312: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1313: free(options.identity_files[i]);
1314: options.identity_files[i] = NULL;
1.134 markus 1315: if (options.identity_keys[i]) {
1316: key_free(options.identity_keys[i]);
1317: options.identity_keys[i] = NULL;
1318: }
1.112 markus 1319: }
1.426 djm 1320: for (i = 0; i < options.num_certificate_files; i++) {
1321: free(options.certificate_files[i]);
1322: options.certificate_files[i] = NULL;
1323: }
1.31 markus 1324:
1.45 markus 1325: exit_status = compat20 ? ssh_session2() : ssh_session();
1326: packet_close();
1.186 djm 1327:
1.312 djm 1328: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1329: unlink(options.control_path);
1330:
1.353 djm 1331: /* Kill ProxyCommand if it is running. */
1332: ssh_kill_proxy_command();
1.186 djm 1333:
1.45 markus 1334: return exit_status;
1335: }
1336:
1.344 djm 1337: static void
1338: control_persist_detach(void)
1339: {
1340: pid_t pid;
1.346 djm 1341: int devnull;
1.344 djm 1342:
1343: debug("%s: backgrounding master process", __func__);
1344:
1345: /*
1346: * master (current process) into the background, and make the
1347: * foreground process a client of the backgrounded master.
1348: */
1349: switch ((pid = fork())) {
1350: case -1:
1351: fatal("%s: fork: %s", __func__, strerror(errno));
1352: case 0:
1353: /* Child: master process continues mainloop */
1354: break;
1355: default:
1356: /* Parent: set up mux slave to connect to backgrounded master */
1357: debug2("%s: background process is %ld", __func__, (long)pid);
1358: stdin_null_flag = ostdin_null_flag;
1.359 djm 1359: options.request_tty = orequest_tty;
1.344 djm 1360: tty_flag = otty_flag;
1361: close(muxserver_sock);
1362: muxserver_sock = -1;
1.351 markus 1363: options.control_master = SSHCTL_MASTER_NO;
1.344 djm 1364: muxclient(options.control_path);
1365: /* muxclient() doesn't return on success. */
1366: fatal("Failed to connect to new control master");
1367: }
1.346 djm 1368: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1369: error("%s: open(\"/dev/null\"): %s", __func__,
1370: strerror(errno));
1371: } else {
1372: if (dup2(devnull, STDIN_FILENO) == -1 ||
1373: dup2(devnull, STDOUT_FILENO) == -1)
1374: error("%s: dup2: %s", __func__, strerror(errno));
1375: if (devnull > STDERR_FILENO)
1376: close(devnull);
1377: }
1.381 djm 1378: daemon(1, 1);
1.362 djm 1379: setproctitle("%s [mux]", options.control_path);
1.344 djm 1380: }
1381:
1382: /* Do fork() after authentication. Used by "ssh -f" */
1383: static void
1384: fork_postauth(void)
1385: {
1386: if (need_controlpersist_detach)
1387: control_persist_detach();
1388: debug("forking to background");
1389: fork_after_authentication_flag = 0;
1390: if (daemon(1, 1) < 0)
1391: fatal("daemon() failed: %.200s", strerror(errno));
1392: }
1393:
1.315 djm 1394: /* Callback for remote forward global requests */
1395: static void
1396: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1397: {
1.406 millert 1398: struct Forward *rfwd = (struct Forward *)ctxt;
1.315 djm 1399:
1.324 djm 1400: /* XXX verbose() on failure? */
1.404 markus 1401: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1402: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1403: rfwd->listen_path ? rfwd->listen_path :
1404: rfwd->listen_host ? rfwd->listen_host : "",
1405: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1406: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1407: rfwd->connect_host, rfwd->connect_port);
1408: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1409: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1410: rfwd->allocated_port = packet_get_int();
1411: logit("Allocated port %u for remote forward to %s:%d",
1412: rfwd->allocated_port,
1413: rfwd->connect_host, rfwd->connect_port);
1414: channel_update_permitted_opens(rfwd->handle,
1415: rfwd->allocated_port);
1416: } else {
1417: channel_update_permitted_opens(rfwd->handle, -1);
1418: }
1.324 djm 1419: }
1420:
1.315 djm 1421: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1422: if (options.exit_on_forward_failure) {
1423: if (rfwd->listen_path != NULL)
1424: fatal("Error: remote port forwarding failed "
1425: "for listen path %s", rfwd->listen_path);
1426: else
1427: fatal("Error: remote port forwarding failed "
1428: "for listen port %d", rfwd->listen_port);
1429: } else {
1430: if (rfwd->listen_path != NULL)
1431: logit("Warning: remote port forwarding failed "
1432: "for listen path %s", rfwd->listen_path);
1433: else
1434: logit("Warning: remote port forwarding failed "
1435: "for listen port %d", rfwd->listen_port);
1436: }
1.315 djm 1437: }
1.318 djm 1438: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1439: debug("All remote forwarding requests processed");
1.344 djm 1440: if (fork_after_authentication_flag)
1441: fork_postauth();
1.318 djm 1442: }
1.315 djm 1443: }
1444:
1.126 itojun 1445: static void
1.331 dtucker 1446: client_cleanup_stdio_fwd(int id, void *arg)
1447: {
1448: debug("stdio forwarding: done");
1449: cleanup_exit(0);
1450: }
1451:
1.368 djm 1452: static void
1.407 djm 1453: ssh_stdio_confirm(int id, int success, void *arg)
1454: {
1455: if (!success)
1456: fatal("stdio forwarding failed");
1457: }
1458:
1459: static void
1.368 djm 1460: ssh_init_stdio_forwarding(void)
1.331 dtucker 1461: {
1462: Channel *c;
1.332 djm 1463: int in, out;
1.331 dtucker 1464:
1.368 djm 1465: if (stdio_forward_host == NULL)
1466: return;
1.384 djm 1467: if (!compat20)
1.368 djm 1468: fatal("stdio forwarding require Protocol 2");
1469:
1470: debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port);
1.332 djm 1471:
1.368 djm 1472: if ((in = dup(STDIN_FILENO)) < 0 ||
1473: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1474: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.368 djm 1475: if ((c = channel_connect_stdio_fwd(stdio_forward_host,
1476: stdio_forward_port, in, out)) == NULL)
1477: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.331 dtucker 1478: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
1.407 djm 1479: channel_register_open_confirm(c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1480: }
1481:
1482: static void
1.70 markus 1483: ssh_init_forwarding(void)
1484: {
1.86 markus 1485: int success = 0;
1.70 markus 1486: int i;
1.331 dtucker 1487:
1.70 markus 1488: /* Initiate local TCP/IP port forwardings. */
1489: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1490: debug("Local connections to %.200s:%d forwarded to remote "
1491: "address %.200s:%d",
1.406 millert 1492: (options.local_forwards[i].listen_path != NULL) ?
1493: options.local_forwards[i].listen_path :
1.234 deraadt 1494: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1495: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1496: options.local_forwards[i].listen_host,
1497: options.local_forwards[i].listen_port,
1.406 millert 1498: (options.local_forwards[i].connect_path != NULL) ?
1499: options.local_forwards[i].connect_path :
1.232 djm 1500: options.local_forwards[i].connect_host,
1501: options.local_forwards[i].connect_port);
1.158 markus 1502: success += channel_setup_local_fwd_listener(
1.406 millert 1503: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1504: }
1.283 markus 1505: if (i > 0 && success != i && options.exit_on_forward_failure)
1506: fatal("Could not request local forwarding.");
1.86 markus 1507: if (i > 0 && success == 0)
1508: error("Could not request local forwarding.");
1.70 markus 1509:
1510: /* Initiate remote TCP/IP port forwardings. */
1511: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1512: debug("Remote connections from %.200s:%d forwarded to "
1513: "local address %.200s:%d",
1.406 millert 1514: (options.remote_forwards[i].listen_path != NULL) ?
1515: options.remote_forwards[i].listen_path :
1.248 djm 1516: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1517: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1518: options.remote_forwards[i].listen_port,
1.406 millert 1519: (options.remote_forwards[i].connect_path != NULL) ?
1520: options.remote_forwards[i].connect_path :
1.232 djm 1521: options.remote_forwards[i].connect_host,
1522: options.remote_forwards[i].connect_port);
1.366 markus 1523: options.remote_forwards[i].handle =
1524: channel_request_remote_forwarding(
1.406 millert 1525: &options.remote_forwards[i]);
1.366 markus 1526: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1527: if (options.exit_on_forward_failure)
1528: fatal("Could not request remote forwarding.");
1529: else
1530: logit("Warning: Could not request remote "
1531: "forwarding.");
1.366 markus 1532: } else {
1533: client_register_global_confirm(ssh_confirm_remote_forward,
1534: &options.remote_forwards[i]);
1.283 markus 1535: }
1.70 markus 1536: }
1.301 djm 1537:
1538: /* Initiate tunnel forwarding. */
1539: if (options.tun_open != SSH_TUNMODE_NO) {
1540: if (client_request_tun_fwd(options.tun_open,
1541: options.tun_local, options.tun_remote) == -1) {
1542: if (options.exit_on_forward_failure)
1543: fatal("Could not request tunnel forwarding.");
1544: else
1545: error("Could not request tunnel forwarding.");
1546: }
1547: }
1.70 markus 1548: }
1549:
1.126 itojun 1550: static void
1.70 markus 1551: check_agent_present(void)
1552: {
1.412 djm 1553: int r;
1554:
1.70 markus 1555: if (options.forward_agent) {
1.254 djm 1556: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1557: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1558: options.forward_agent = 0;
1.412 djm 1559: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1560: debug("ssh_get_authentication_socket: %s",
1561: ssh_err(r));
1562: }
1.70 markus 1563: }
1564: }
1565:
1.126 itojun 1566: static int
1.45 markus 1567: ssh_session(void)
1568: {
1569: int type;
1570: int interactive = 0;
1571: int have_tty = 0;
1572: struct winsize ws;
1573: char *cp;
1.243 djm 1574: const char *display;
1.45 markus 1575:
1.31 markus 1576: /* Enable compression if requested. */
1577: if (options.compression) {
1.316 djm 1578: debug("Requesting compression at level %d.",
1579: options.compression_level);
1.31 markus 1580:
1.316 djm 1581: if (options.compression_level < 1 ||
1582: options.compression_level > 9)
1583: fatal("Compression level must be from 1 (fast) to "
1584: "9 (slow, best).");
1.31 markus 1585:
1586: /* Send the request. */
1587: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1588: packet_put_int(options.compression_level);
1589: packet_send();
1590: packet_write_wait();
1.156 markus 1591: type = packet_read();
1.31 markus 1592: if (type == SSH_SMSG_SUCCESS)
1593: packet_start_compression(options.compression_level);
1594: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1595: logit("Warning: Remote host refused compression.");
1.31 markus 1596: else
1.316 djm 1597: packet_disconnect("Protocol error waiting for "
1598: "compression response.");
1.31 markus 1599: }
1600: /* Allocate a pseudo tty if appropriate. */
1601: if (tty_flag) {
1602: debug("Requesting pty.");
1603:
1604: /* Start the packet. */
1605: packet_start(SSH_CMSG_REQUEST_PTY);
1606:
1607: /* Store TERM in the packet. There is no limit on the
1608: length of the string. */
1609: cp = getenv("TERM");
1610: if (!cp)
1611: cp = "";
1.124 markus 1612: packet_put_cstring(cp);
1.31 markus 1613:
1614: /* Store window size in the packet. */
1615: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1616: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1617: packet_put_int((u_int)ws.ws_row);
1618: packet_put_int((u_int)ws.ws_col);
1619: packet_put_int((u_int)ws.ws_xpixel);
1620: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1621:
1622: /* Store tty modes in the packet. */
1.115 stevesk 1623: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1624:
1625: /* Send the packet, and wait for it to leave. */
1626: packet_send();
1627: packet_write_wait();
1628:
1629: /* Read response from the server. */
1.156 markus 1630: type = packet_read();
1.43 markus 1631: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1632: interactive = 1;
1.45 markus 1633: have_tty = 1;
1.43 markus 1634: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1635: logit("Warning: Remote host failed or refused to "
1636: "allocate a pseudo tty.");
1.31 markus 1637: else
1.316 djm 1638: packet_disconnect("Protocol error waiting for pty "
1639: "request response.");
1.31 markus 1640: }
1641: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1642: display = getenv("DISPLAY");
1.417 djm 1643: if (display == NULL && options.forward_x11)
1644: debug("X11 forwarding requested but DISPLAY not set");
1.243 djm 1645: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1646: char *proto, *data;
1.50 markus 1647: /* Get reasonable local authentication information. */
1.243 djm 1648: client_x11_get_proto(display, options.xauth_location,
1.384 djm 1649: options.forward_x11_trusted,
1.340 djm 1650: options.forward_x11_timeout,
1651: &proto, &data);
1.50 markus 1652: /* Request forwarding with authentication spoofing. */
1.316 djm 1653: debug("Requesting X11 forwarding with authentication "
1654: "spoofing.");
1.363 djm 1655: x11_request_forwarding_with_spoofing(0, display, proto,
1656: data, 0);
1.31 markus 1657: /* Read response from the server. */
1.156 markus 1658: type = packet_read();
1.31 markus 1659: if (type == SSH_SMSG_SUCCESS) {
1660: interactive = 1;
1.50 markus 1661: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 1662: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 1663: } else {
1.316 djm 1664: packet_disconnect("Protocol error waiting for X11 "
1665: "forwarding");
1.50 markus 1666: }
1.31 markus 1667: }
1668: /* Tell the packet module whether this is an interactive session. */
1.354 djm 1669: packet_set_interactive(interactive,
1670: options.ip_qos_interactive, options.ip_qos_bulk);
1.31 markus 1671:
1672: /* Request authentication agent forwarding if appropriate. */
1.70 markus 1673: check_agent_present();
1674:
1.31 markus 1675: if (options.forward_agent) {
1676: debug("Requesting authentication agent forwarding.");
1677: auth_request_forwarding();
1678:
1679: /* Read response from the server. */
1.156 markus 1680: type = packet_read();
1.155 markus 1681: packet_check_eom();
1.31 markus 1682: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1683: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1684: }
1685:
1.70 markus 1686: /* Initiate port forwardings. */
1.368 djm 1687: ssh_init_stdio_forwarding();
1.70 markus 1688: ssh_init_forwarding();
1.305 dtucker 1689:
1690: /* Execute a local command */
1691: if (options.local_command != NULL &&
1692: options.permit_local_command)
1693: ssh_local_cmd(options.local_command);
1.34 markus 1694:
1.318 djm 1695: /*
1696: * If requested and we are not interested in replies to remote
1697: * forwarding requests, then let ssh continue in the background.
1698: */
1.344 djm 1699: if (fork_after_authentication_flag) {
1700: if (options.exit_on_forward_failure &&
1701: options.num_remote_forwards > 0) {
1702: debug("deferring postauth fork until remote forward "
1703: "confirmation received");
1704: } else
1705: fork_postauth();
1.318 djm 1706: }
1.31 markus 1707:
1.33 markus 1708: /*
1709: * If a command was specified on the command line, execute the
1710: * command now. Otherwise request the server to start a shell.
1711: */
1.31 markus 1712: if (buffer_len(&command) > 0) {
1713: int len = buffer_len(&command);
1714: if (len > 900)
1715: len = 900;
1.316 djm 1716: debug("Sending command: %.*s", len,
1717: (u_char *)buffer_ptr(&command));
1.31 markus 1718: packet_start(SSH_CMSG_EXEC_CMD);
1719: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1720: packet_send();
1721: packet_write_wait();
1722: } else {
1723: debug("Requesting shell.");
1724: packet_start(SSH_CMSG_EXEC_SHELL);
1725: packet_send();
1726: packet_write_wait();
1727: }
1728:
1729: /* Enter the interactive session. */
1.119 stevesk 1730: return client_loop(have_tty, tty_flag ?
1731: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.89 markus 1732: }
1733:
1.214 djm 1734: /* request pty/x11/agent/tcpfwd/shell for channel */
1735: static void
1.337 djm 1736: ssh_session2_setup(int id, int success, void *arg)
1.214 djm 1737: {
1.215 djm 1738: extern char **environ;
1.243 djm 1739: const char *display;
1740: int interactive = tty_flag;
1.337 djm 1741:
1742: if (!success)
1743: return; /* No need for error message, channels code sens one */
1.215 djm 1744:
1.248 djm 1745: display = getenv("DISPLAY");
1.417 djm 1746: if (display == NULL && options.forward_x11)
1747: debug("X11 forwarding requested but DISPLAY not set");
1.243 djm 1748: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1749: char *proto, *data;
1.50 markus 1750: /* Get reasonable local authentication information. */
1.243 djm 1751: client_x11_get_proto(display, options.xauth_location,
1.340 djm 1752: options.forward_x11_trusted,
1753: options.forward_x11_timeout, &proto, &data);
1.50 markus 1754: /* Request forwarding with authentication spoofing. */
1.316 djm 1755: debug("Requesting X11 forwarding with authentication "
1756: "spoofing.");
1.363 djm 1757: x11_request_forwarding_with_spoofing(id, display, proto,
1758: data, 1);
1759: client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1760: /* XXX exit_on_forward_failure */
1.80 markus 1761: interactive = 1;
1.50 markus 1762: }
1763:
1.70 markus 1764: check_agent_present();
1765: if (options.forward_agent) {
1766: debug("Requesting authentication agent forwarding.");
1767: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1768: packet_send();
1.212 djm 1769: }
1.369 dtucker 1770:
1771: /* Tell the packet module whether this is an interactive session. */
1772: packet_set_interactive(interactive,
1773: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1774:
1.214 djm 1775: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1776: NULL, fileno(stdin), &command, environ);
1.45 markus 1777: }
1778:
1.143 markus 1779: /* open new channel for a session */
1.126 itojun 1780: static int
1.143 markus 1781: ssh_session2_open(void)
1.45 markus 1782: {
1.118 markus 1783: Channel *c;
1784: int window, packetmax, in, out, err;
1.60 markus 1785:
1.62 markus 1786: if (stdin_null_flag) {
1.93 itojun 1787: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1788: } else {
1789: in = dup(STDIN_FILENO);
1790: }
1.60 markus 1791: out = dup(STDOUT_FILENO);
1792: err = dup(STDERR_FILENO);
1.45 markus 1793:
1794: if (in < 0 || out < 0 || err < 0)
1.62 markus 1795: fatal("dup() in/out/err failed");
1.45 markus 1796:
1.69 markus 1797: /* enable nonblocking unless tty */
1798: if (!isatty(in))
1799: set_nonblock(in);
1800: if (!isatty(out))
1801: set_nonblock(out);
1802: if (!isatty(err))
1803: set_nonblock(err);
1804:
1.65 markus 1805: window = CHAN_SES_WINDOW_DEFAULT;
1806: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1807: if (tty_flag) {
1808: window >>= 1;
1809: packetmax >>= 1;
1.45 markus 1810: }
1.118 markus 1811: c = channel_new(
1.45 markus 1812: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1813: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1814: "client-session", /*nonblock*/0);
1.45 markus 1815:
1.143 markus 1816: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1817:
1.122 markus 1818: channel_send_open(c->self);
1.143 markus 1819: if (!no_shell_flag)
1.310 djm 1820: channel_register_open_confirm(c->self,
1821: ssh_session2_setup, NULL);
1.106 markus 1822:
1.118 markus 1823: return c->self;
1.106 markus 1824: }
1825:
1.126 itojun 1826: static int
1.106 markus 1827: ssh_session2(void)
1828: {
1.143 markus 1829: int id = -1;
1.106 markus 1830:
1831: /* XXX should be pre-session */
1.368 djm 1832: if (!options.control_persist)
1833: ssh_init_stdio_forwarding();
1.106 markus 1834: ssh_init_forwarding();
1835:
1.344 djm 1836: /* Start listening for multiplex clients */
1837: muxserver_listen();
1838:
1839: /*
1.368 djm 1840: * If we are in control persist mode and have a working mux listen
1841: * socket, then prepare to background ourselves and have a foreground
1842: * client attach as a control slave.
1843: * NB. we must save copies of the flags that we override for
1.344 djm 1844: * the backgrounding, since we defer attachment of the slave until
1845: * after the connection is fully established (in particular,
1846: * async rfwd replies have been received for ExitOnForwardFailure).
1847: */
1848: if (options.control_persist && muxserver_sock != -1) {
1849: ostdin_null_flag = stdin_null_flag;
1850: ono_shell_flag = no_shell_flag;
1.359 djm 1851: orequest_tty = options.request_tty;
1.344 djm 1852: otty_flag = tty_flag;
1853: stdin_null_flag = 1;
1854: no_shell_flag = 1;
1855: tty_flag = 0;
1856: if (!fork_after_authentication_flag)
1857: need_controlpersist_detach = 1;
1858: fork_after_authentication_flag = 1;
1859: }
1.368 djm 1860: /*
1861: * ControlPersist mux listen socket setup failed, attempt the
1862: * stdio forward setup that we skipped earlier.
1863: */
1864: if (options.control_persist && muxserver_sock == -1)
1865: ssh_init_stdio_forwarding();
1.344 djm 1866:
1.143 markus 1867: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1868: id = ssh_session2_open();
1.379 djm 1869: else {
1870: packet_set_interactive(
1871: options.control_master == SSHCTL_MASTER_NO,
1872: options.ip_qos_interactive, options.ip_qos_bulk);
1873: }
1.314 djm 1874:
1875: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1876: if (options.control_master == SSHCTL_MASTER_NO &&
1877: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1878: debug("Requesting no-more-sessions@openssh.com");
1879: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1880: packet_put_cstring("no-more-sessions@openssh.com");
1881: packet_put_char(0);
1882: packet_send();
1883: }
1.255 reyk 1884:
1885: /* Execute a local command */
1886: if (options.local_command != NULL &&
1887: options.permit_local_command)
1888: ssh_local_cmd(options.local_command);
1.301 djm 1889:
1.342 djm 1890: /*
1891: * If requested and we are not interested in replies to remote
1892: * forwarding requests, then let ssh continue in the background.
1893: */
1.344 djm 1894: if (fork_after_authentication_flag) {
1895: if (options.exit_on_forward_failure &&
1896: options.num_remote_forwards > 0) {
1897: debug("deferring postauth fork until remote forward "
1898: "confirmation received");
1899: } else
1900: fork_postauth();
1.318 djm 1901: }
1.327 andreas 1902:
1903: if (options.use_roaming)
1904: request_roaming();
1.31 markus 1905:
1.119 stevesk 1906: return client_loop(tty_flag, tty_flag ?
1907: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1908: }
1909:
1.426 djm 1910: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 1911: static void
1.104 markus 1912: load_public_identity_files(void)
1913: {
1.275 djm 1914: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1915: char *pwdir = NULL, *pwname = NULL;
1.104 markus 1916: Key *public;
1.275 djm 1917: struct passwd *pw;
1.426 djm 1918: int i;
1919: u_int n_ids, n_certs;
1.335 djm 1920: char *identity_files[SSH_MAX_IDENTITY_FILES];
1921: Key *identity_keys[SSH_MAX_IDENTITY_FILES];
1.426 djm 1922: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
1923: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 1924: #ifdef ENABLE_PKCS11
1.167 markus 1925: Key **keys;
1.333 markus 1926: int nkeys;
1.335 djm 1927: #endif /* PKCS11 */
1.104 markus 1928:
1.426 djm 1929: n_ids = n_certs = 0;
1.398 tedu 1930: memset(identity_files, 0, sizeof(identity_files));
1931: memset(identity_keys, 0, sizeof(identity_keys));
1.426 djm 1932: memset(certificate_files, 0, sizeof(certificate_files));
1933: memset(certificates, 0, sizeof(certificates));
1.335 djm 1934:
1935: #ifdef ENABLE_PKCS11
1.333 markus 1936: if (options.pkcs11_provider != NULL &&
1.167 markus 1937: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1938: (pkcs11_init(!options.batch_mode) == 0) &&
1939: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1940: &keys)) > 0) {
1941: for (i = 0; i < nkeys; i++) {
1.335 djm 1942: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1943: key_free(keys[i]);
1944: continue;
1945: }
1946: identity_keys[n_ids] = keys[i];
1947: identity_files[n_ids] =
1.333 markus 1948: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 1949: n_ids++;
1.167 markus 1950: }
1.378 djm 1951: free(keys);
1.127 markus 1952: }
1.333 markus 1953: #endif /* ENABLE_PKCS11 */
1.275 djm 1954: if ((pw = getpwuid(original_real_uid)) == NULL)
1955: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 1956: pwname = xstrdup(pw->pw_name);
1957: pwdir = xstrdup(pw->pw_dir);
1.275 djm 1958: if (gethostname(thishost, sizeof(thishost)) == -1)
1959: fatal("load_public_identity_files: gethostname: %s",
1960: strerror(errno));
1.335 djm 1961: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 1962: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
1963: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 1964: free(options.identity_files[i]);
1.426 djm 1965: options.identity_files[i] = NULL;
1.335 djm 1966: continue;
1967: }
1.275 djm 1968: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1969: original_real_uid);
1.306 deraadt 1970: filename = percent_expand(cp, "d", pwdir,
1971: "u", pwname, "l", thishost, "h", host,
1.275 djm 1972: "r", options.user, (char *)NULL);
1.378 djm 1973: free(cp);
1.131 millert 1974: public = key_load_public(filename, NULL);
1975: debug("identity file %s type %d", filename,
1976: public ? public->type : -1);
1.378 djm 1977: free(options.identity_files[i]);
1.335 djm 1978: identity_files[n_ids] = filename;
1979: identity_keys[n_ids] = public;
1980:
1981: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1982: continue;
1983:
1.426 djm 1984: /*
1985: * If no certificates have been explicitly listed then try
1986: * to add the default certificate variant too.
1987: */
1988: if (options.num_certificate_files != 0)
1989: continue;
1.335 djm 1990: xasprintf(&cp, "%s-cert", filename);
1991: public = key_load_public(cp, NULL);
1992: debug("identity file %s type %d", cp,
1993: public ? public->type : -1);
1994: if (public == NULL) {
1.378 djm 1995: free(cp);
1.335 djm 1996: continue;
1997: }
1998: if (!key_is_cert(public)) {
1999: debug("%s: key %s type %s is not a certificate",
2000: __func__, cp, key_type(public));
2001: key_free(public);
1.378 djm 2002: free(cp);
1.335 djm 2003: continue;
2004: }
2005: identity_keys[n_ids] = public;
1.426 djm 2006: identity_files[n_ids] = cp;
1.335 djm 2007: n_ids++;
2008: }
1.426 djm 2009:
2010: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
2011: fatal("%s: too many certificates", __func__);
2012: for (i = 0; i < options.num_certificate_files; i++) {
2013: cp = tilde_expand_filename(options.certificate_files[i],
2014: original_real_uid);
2015: filename = percent_expand(cp, "d", pwdir,
2016: "u", pwname, "l", thishost, "h", host,
2017: "r", options.user, (char *)NULL);
2018: free(cp);
2019:
2020: public = key_load_public(filename, NULL);
2021: debug("certificate file %s type %d", filename,
2022: public ? public->type : -1);
2023: free(options.certificate_files[i]);
2024: options.certificate_files[i] = NULL;
2025: if (public == NULL) {
2026: free(filename);
2027: continue;
2028: }
2029: if (!key_is_cert(public)) {
2030: debug("%s: key %s type %s is not a certificate",
2031: __func__, filename, key_type(public));
2032: key_free(public);
2033: free(filename);
2034: continue;
2035: }
2036: certificate_files[n_certs] = filename;
2037: certificates[n_certs] = public;
2038: ++n_certs;
2039: }
2040:
1.335 djm 2041: options.num_identity_files = n_ids;
2042: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2043: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.426 djm 2044:
2045: options.num_certificate_files = n_certs;
2046: memcpy(options.certificate_files,
2047: certificate_files, sizeof(certificate_files));
2048: memcpy(options.certificates, certificates, sizeof(certificates));
1.335 djm 2049:
1.398 tedu 2050: explicit_bzero(pwname, strlen(pwname));
1.378 djm 2051: free(pwname);
1.398 tedu 2052: explicit_bzero(pwdir, strlen(pwdir));
1.378 djm 2053: free(pwdir);
1.214 djm 2054: }
1.352 djm 2055:
2056: static void
2057: main_sigchld_handler(int sig)
2058: {
2059: int save_errno = errno;
2060: pid_t pid;
2061: int status;
2062:
2063: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
2064: (pid < 0 && errno == EINTR))
2065: ;
2066:
2067: signal(sig, main_sigchld_handler);
2068: errno = save_errno;
2069: }
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