Annotation of src/usr.bin/ssh/ssh.c, Revision 1.430
1.430 ! djm 1: /* $OpenBSD: ssh.c,v 1.429 2015/10/25 23:42:00 dtucker Exp $ */
1.1 deraadt 2: /*
1.32 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * Ssh client program. This program can be used to log into a remote machine.
7: * The software supports strong authentication, encryption, and forwarding
8: * of X11, TCP/IP, and authentication connections.
9: *
1.64 deraadt 10: * As far as I am concerned, the code I have written for this software
11: * can be used freely for any purpose. Any derived versions of this
12: * software must be clearly marked as such, and if the derived work is
13: * incompatible with the protocol description in the RFC file, it must be
14: * called by a name other than "ssh" or "Secure Shell".
15: *
16: * Copyright (c) 1999 Niels Provos. All rights reserved.
1.202 markus 17: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 18: *
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':
1.429 dtucker 687: p = tilde_expand_filename(optarg, original_real_uid);
688: if (stat(p, &st) < 0)
1.128 fgsch 689: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 690: "not accessible: %s.\n", p,
1.231 otto 691: strerror(errno));
1.429 dtucker 692: else
693: add_identity_file(&options, NULL, p, 1);
694: free(p);
1.31 markus 695: break;
1.127 markus 696: case 'I':
1.333 markus 697: #ifdef ENABLE_PKCS11
1.422 dtucker 698: free(options.pkcs11_provider);
1.333 markus 699: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 700: #else
1.333 markus 701: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 702: #endif
1.127 markus 703: break;
1.31 markus 704: case 't':
1.359 djm 705: if (options.request_tty == REQUEST_TTY_YES)
706: options.request_tty = REQUEST_TTY_FORCE;
707: else
708: options.request_tty = REQUEST_TTY_YES;
1.31 markus 709: break;
710: case 'v':
1.197 markus 711: if (debug_flag == 0) {
1.66 markus 712: debug_flag = 1;
713: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 714: } else {
715: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
716: options.log_level++;
717: }
1.375 dtucker 718: break;
1.31 markus 719: case 'V':
1.209 markus 720: fprintf(stderr, "%s, %s\n",
1.402 markus 721: SSH_VERSION,
722: #ifdef WITH_OPENSSL
723: SSLeay_version(SSLEAY_VERSION)
724: #else
725: "without OpenSSL"
726: #endif
727: );
1.31 markus 728: if (opt == 'V')
729: exit(0);
730: break;
1.255 reyk 731: case 'w':
1.256 reyk 732: if (options.tun_open == -1)
733: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 734: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 735: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 736: fprintf(stderr,
737: "Bad tun device '%s'\n", optarg);
1.257 dtucker 738: exit(255);
1.255 reyk 739: }
740: break;
1.331 dtucker 741: case 'W':
1.332 djm 742: if (stdio_forward_host != NULL)
743: fatal("stdio forward already specified");
744: if (muxclient_command != 0)
745: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 746: if (parse_forward(&fwd, optarg, 1, 0)) {
747: stdio_forward_host = fwd.listen_host;
748: stdio_forward_port = fwd.listen_port;
1.378 djm 749: free(fwd.connect_host);
1.331 dtucker 750: } else {
751: fprintf(stderr,
752: "Bad stdio forwarding specification '%s'\n",
753: optarg);
754: exit(255);
755: }
1.359 djm 756: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 757: no_shell_flag = 1;
758: options.clear_forwardings = 1;
759: options.exit_on_forward_failure = 1;
760: break;
1.31 markus 761: case 'q':
762: options.log_level = SYSLOG_LEVEL_QUIET;
763: break;
764: case 'e':
765: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 766: (u_char) optarg[1] >= 64 &&
767: (u_char) optarg[1] < 128)
1.78 markus 768: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 769: else if (strlen(optarg) == 1)
1.78 markus 770: options.escape_char = (u_char) optarg[0];
1.31 markus 771: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 772: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 773: else {
1.128 fgsch 774: fprintf(stderr, "Bad escape character '%s'.\n",
775: optarg);
1.257 dtucker 776: exit(255);
1.31 markus 777: }
778: break;
779: case 'c':
1.420 djm 780: if (ciphers_valid(*optarg == '+' ?
781: optarg + 1 : optarg)) {
1.49 markus 782: /* SSH2 only */
1.422 dtucker 783: free(options.ciphers);
1.49 markus 784: options.ciphers = xstrdup(optarg);
1.224 markus 785: options.cipher = SSH_CIPHER_INVALID;
1.420 djm 786: break;
787: }
788: /* SSH1 only */
789: options.cipher = cipher_number(optarg);
790: if (options.cipher == -1) {
791: fprintf(stderr, "Unknown cipher type '%s'\n",
792: optarg);
793: exit(255);
1.95 markus 794: }
1.420 djm 795: if (options.cipher == SSH_CIPHER_3DES)
796: options.ciphers = xstrdup("3des-cbc");
797: else if (options.cipher == SSH_CIPHER_BLOWFISH)
798: options.ciphers = xstrdup("blowfish-cbc");
799: else
800: options.ciphers = xstrdup(KEX_CLIENT_ENCRYPT);
1.95 markus 801: break;
802: case 'm':
1.422 dtucker 803: if (mac_valid(optarg)) {
804: free(options.macs);
1.95 markus 805: options.macs = xstrdup(optarg);
1.422 dtucker 806: } else {
1.128 fgsch 807: fprintf(stderr, "Unknown mac type '%s'\n",
808: optarg);
1.257 dtucker 809: exit(255);
1.31 markus 810: }
811: break;
1.214 djm 812: case 'M':
1.242 djm 813: if (options.control_master == SSHCTL_MASTER_YES)
814: options.control_master = SSHCTL_MASTER_ASK;
815: else
816: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 817: break;
1.31 markus 818: case 'p':
1.113 stevesk 819: options.port = a2port(optarg);
1.323 djm 820: if (options.port <= 0) {
1.109 markus 821: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 822: exit(255);
1.109 markus 823: }
1.31 markus 824: break;
825: case 'l':
826: options.user = optarg;
827: break;
1.141 stevesk 828:
829: case 'L':
1.324 djm 830: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 831: add_local_forward(&options, &fwd);
832: else {
1.128 fgsch 833: fprintf(stderr,
1.232 djm 834: "Bad local forwarding specification '%s'\n",
1.128 fgsch 835: optarg);
1.257 dtucker 836: exit(255);
1.31 markus 837: }
1.232 djm 838: break;
839:
840: case 'R':
1.324 djm 841: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 842: add_remote_forward(&options, &fwd);
843: } else {
1.128 fgsch 844: fprintf(stderr,
1.232 djm 845: "Bad remote forwarding specification "
846: "'%s'\n", optarg);
1.257 dtucker 847: exit(255);
1.31 markus 848: }
849: break;
1.108 markus 850:
851: case 'D':
1.324 djm 852: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 853: add_local_forward(&options, &fwd);
1.232 djm 854: } else {
1.322 stevesk 855: fprintf(stderr,
856: "Bad dynamic forwarding specification "
857: "'%s'\n", optarg);
1.257 dtucker 858: exit(255);
1.109 markus 859: }
1.108 markus 860: break;
861:
1.31 markus 862: case 'C':
863: options.compression = 1;
864: break;
1.45 markus 865: case 'N':
866: no_shell_flag = 1;
1.359 djm 867: options.request_tty = REQUEST_TTY_NO;
1.45 markus 868: break;
869: case 'T':
1.359 djm 870: options.request_tty = REQUEST_TTY_NO;
1.45 markus 871: break;
1.31 markus 872: case 'o':
1.205 markus 873: line = xstrdup(optarg);
1.408 djm 874: if (process_config_line(&options, pw,
875: host ? host : "", host ? host : "", line,
876: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 877: exit(255);
1.378 djm 878: free(line);
1.31 markus 879: break;
1.85 djm 880: case 's':
881: subsystem_flag = 1;
1.117 markus 882: break;
1.214 djm 883: case 'S':
884: if (options.control_path != NULL)
885: free(options.control_path);
886: options.control_path = xstrdup(optarg);
887: break;
1.117 markus 888: case 'b':
889: options.bind_address = optarg;
1.85 djm 890: break;
1.139 markus 891: case 'F':
892: config = optarg;
893: break;
1.31 markus 894: default:
895: usage();
1.1 deraadt 896: }
1.31 markus 897: }
898:
1.128 fgsch 899: ac -= optind;
900: av += optind;
901:
1.329 guenther 902: if (ac > 0 && !host) {
1.188 markus 903: if (strrchr(*av, '@')) {
1.128 fgsch 904: p = xstrdup(*av);
1.188 markus 905: cp = strrchr(p, '@');
1.128 fgsch 906: if (cp == NULL || cp == p)
907: usage();
908: options.user = p;
909: *cp = '\0';
1.385 djm 910: host = xstrdup(++cp);
1.128 fgsch 911: } else
1.385 djm 912: host = xstrdup(*av);
1.189 millert 913: if (ac > 1) {
914: optind = optreset = 1;
1.128 fgsch 915: goto again;
916: }
1.189 millert 917: ac--, av++;
1.128 fgsch 918: }
919:
1.31 markus 920: /* Check that we got a host name. */
921: if (!host)
922: usage();
923:
1.385 djm 924: host_arg = xstrdup(host);
925:
1.402 markus 926: #ifdef WITH_OPENSSL
1.350 djm 927: OpenSSL_add_all_algorithms();
1.72 markus 928: ERR_load_crypto_strings();
1.402 markus 929: #endif
1.31 markus 930:
931: /* Initialize the command to execute on remote host. */
932: buffer_init(&command);
1.1 deraadt 933:
1.33 markus 934: /*
935: * Save the command to execute on the remote host in a buffer. There
936: * is no limit on the length of the command, except by the maximum
937: * packet size. Also sets the tty flag if there is no command.
938: */
1.128 fgsch 939: if (!ac) {
1.31 markus 940: /* No command specified - execute shell on a tty. */
1.85 djm 941: if (subsystem_flag) {
1.128 fgsch 942: fprintf(stderr,
943: "You must specify a subsystem to invoke.\n");
1.85 djm 944: usage();
945: }
1.31 markus 946: } else {
1.128 fgsch 947: /* A command has been specified. Store it into the buffer. */
948: for (i = 0; i < ac; i++) {
949: if (i)
1.31 markus 950: buffer_append(&command, " ", 1);
951: buffer_append(&command, av[i], strlen(av[i]));
952: }
953: }
954:
955: /* Cannot fork to background if no command. */
1.316 djm 956: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
957: !no_shell_flag)
958: fatal("Cannot fork into background without a command "
959: "to execute.");
1.31 markus 960:
1.101 markus 961: /*
962: * Initialize "log" output. Since we are the client all output
1.375 dtucker 963: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 964: */
1.375 dtucker 965: if (use_syslog && logfile != NULL)
966: fatal("Can't specify both -y and -E");
1.422 dtucker 967: if (logfile != NULL)
1.375 dtucker 968: log_redirect_stderr_to(logfile);
1.325 markus 969: log_init(argv0,
1.316 djm 970: options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
1.320 djm 971: SYSLOG_FACILITY_USER, !use_syslog);
1.375 dtucker 972:
973: if (debug_flag)
1.402 markus 974: logit("%s, %s", SSH_VERSION,
975: #ifdef WITH_OPENSSL
976: SSLeay_version(SSLEAY_VERSION)
977: #else
978: "without OpenSSL"
979: #endif
980: );
1.31 markus 981:
1.400 djm 982: /* Parse the configuration files */
1.408 djm 983: process_config_files(host_arg, pw, 0);
1.400 djm 984:
985: /* Hostname canonicalisation needs a few options filled. */
986: fill_default_options_for_canonicalization(&options);
987:
988: /* If the user has replaced the hostname then take it into use now */
989: if (options.hostname != NULL) {
990: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
991: cp = percent_expand(options.hostname,
992: "h", host, (char *)NULL);
993: free(host);
994: host = cp;
1.408 djm 995: free(options.hostname);
996: options.hostname = xstrdup(host);
1.400 djm 997: }
998:
999: /* If canonicalization requested then try to apply it */
1000: lowercase(host);
1001: if (options.canonicalize_hostname != SSH_CANONICALISE_NO)
1002: addrs = resolve_canonicalize(&host, options.port);
1003:
1.139 markus 1004: /*
1.401 djm 1005: * If CanonicalizePermittedCNAMEs have been specified but
1006: * other canonicalization did not happen (by not being requested
1007: * or by failing with fallback) then the hostname may still be changed
1008: * as a result of CNAME following.
1009: *
1010: * Try to resolve the bare hostname name using the system resolver's
1011: * usual search rules and then apply the CNAME follow rules.
1012: *
1013: * Skip the lookup if a ProxyCommand is being used unless the user
1014: * has specifically requested canonicalisation for this case via
1015: * CanonicalizeHostname=always
1.139 markus 1016: */
1.401 djm 1017: if (addrs == NULL && options.num_permitted_cnames != 0 &&
1018: (option_clear_or_none(options.proxy_command) ||
1.400 djm 1019: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1020: if ((addrs = resolve_host(host, options.port,
1021: option_clear_or_none(options.proxy_command),
1022: cname, sizeof(cname))) == NULL) {
1023: /* Don't fatal proxied host names not in the DNS */
1024: if (option_clear_or_none(options.proxy_command))
1025: cleanup_exit(255); /* logged in resolve_host */
1026: } else
1027: check_follow_cname(&host, cname);
1.400 djm 1028: }
1.139 markus 1029:
1.400 djm 1030: /*
1.408 djm 1031: * If canonicalisation is enabled then re-parse the configuration
1032: * files as new stanzas may match.
1.400 djm 1033: */
1.408 djm 1034: if (options.canonicalize_hostname != 0) {
1035: debug("Re-reading configuration after hostname "
1036: "canonicalisation");
1037: free(options.hostname);
1038: options.hostname = xstrdup(host);
1039: process_config_files(host_arg, pw, 1);
1040: /*
1041: * Address resolution happens early with canonicalisation
1042: * enabled and the port number may have changed since, so
1043: * reset it in address list
1044: */
1045: if (addrs != NULL && options.port > 0)
1046: set_addrinfo_port(addrs, options.port);
1.139 markus 1047: }
1.31 markus 1048:
1049: /* Fill configuration defaults. */
1050: fill_default_options(&options);
1051:
1.400 djm 1052: if (options.port == 0)
1053: options.port = default_ssh_port();
1.196 djm 1054: channel_set_af(options.address_family);
1055:
1.383 djm 1056: /* Tidy and check options */
1057: if (options.host_key_alias != NULL)
1058: lowercase(options.host_key_alias);
1059: if (options.proxy_command != NULL &&
1060: strcmp(options.proxy_command, "-") == 0 &&
1061: options.proxy_use_fdpass)
1062: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.415 djm 1063: if (options.control_persist &&
1064: options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1065: debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1066: "disabling");
1067: options.update_hostkeys = 0;
1068: }
1.430 ! djm 1069: if (options.connection_attempts <= 0)
! 1070: fatal("Invalid number of ConnectionAttempts");
! 1071:
1.388 djm 1072: if (original_effective_uid != 0)
1073: options.use_privileged_port = 0;
1.383 djm 1074:
1.31 markus 1075: /* reinit */
1.325 markus 1076: log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
1.370 djm 1077:
1078: if (options.request_tty == REQUEST_TTY_YES ||
1079: options.request_tty == REQUEST_TTY_FORCE)
1080: tty_flag = 1;
1081:
1082: /* Allocate a tty by default if no command specified. */
1083: if (buffer_len(&command) == 0)
1084: tty_flag = options.request_tty != REQUEST_TTY_NO;
1085:
1086: /* Force no tty */
1087: if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
1088: tty_flag = 0;
1089: /* Do not allocate a tty if stdin is not a tty. */
1090: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1091: options.request_tty != REQUEST_TTY_FORCE) {
1092: if (tty_flag)
1093: logit("Pseudo-terminal will not be allocated because "
1094: "stdin is not a terminal.");
1095: tty_flag = 0;
1096: }
1.31 markus 1097:
1098: if (options.user == NULL)
1099: options.user = xstrdup(pw->pw_name);
1.343 djm 1100:
1.358 djm 1101: if (gethostname(thishost, sizeof(thishost)) == -1)
1102: fatal("gethostname: %s", strerror(errno));
1103: strlcpy(shorthost, thishost, sizeof(shorthost));
1104: shorthost[strcspn(thishost, ".")] = '\0';
1105: snprintf(portstr, sizeof(portstr), "%d", options.port);
1.423 djm 1106: snprintf(uidstr, sizeof(uidstr), "%d", pw->pw_uid);
1.358 djm 1107:
1.405 djm 1108: if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1109: ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1110: ssh_digest_update(md, host, strlen(host)) < 0 ||
1111: ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1112: ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1113: ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1114: fatal("%s: mux digest failed", __func__);
1115: ssh_digest_free(md);
1116: conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1117:
1.317 dtucker 1118: if (options.local_command != NULL) {
1119: debug3("expanding LocalCommand: %s", options.local_command);
1120: cp = options.local_command;
1.405 djm 1121: options.local_command = percent_expand(cp,
1122: "C", conn_hash_hex,
1123: "L", shorthost,
1124: "d", pw->pw_dir,
1125: "h", host,
1126: "l", thishost,
1127: "n", host_arg,
1128: "p", portstr,
1129: "r", options.user,
1130: "u", pw->pw_name,
1.358 djm 1131: (char *)NULL);
1.317 dtucker 1132: debug3("expanded LocalCommand: %s", options.local_command);
1.378 djm 1133: free(cp);
1.304 dtucker 1134: }
1.31 markus 1135:
1.214 djm 1136: if (options.control_path != NULL) {
1.241 djm 1137: cp = tilde_expand_filename(options.control_path,
1138: original_real_uid);
1.378 djm 1139: free(options.control_path);
1.405 djm 1140: options.control_path = percent_expand(cp,
1141: "C", conn_hash_hex,
1142: "L", shorthost,
1143: "h", host,
1144: "l", thishost,
1145: "n", host_arg,
1146: "p", portstr,
1147: "r", options.user,
1148: "u", pw->pw_name,
1.423 djm 1149: "i", uidstr,
1.358 djm 1150: (char *)NULL);
1.378 djm 1151: free(cp);
1.214 djm 1152: }
1.405 djm 1153: free(conn_hash_hex);
1.408 djm 1154:
1155: if (config_test) {
1156: dump_client_config(&options, host);
1157: exit(0);
1158: }
1.405 djm 1159:
1.312 djm 1160: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1161: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 1162: if (options.control_path != NULL)
1.312 djm 1163: muxclient(options.control_path);
1.401 djm 1164:
1165: /*
1166: * If hostname canonicalisation was not enabled, then we may not
1167: * have yet resolved the hostname. Do so now.
1168: */
1169: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1170: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1171: if ((addrs = resolve_host(host, options.port, 1,
1172: cname, sizeof(cname))) == NULL)
1173: cleanup_exit(255); /* resolve_host logs the error */
1174: }
1.214 djm 1175:
1.303 djm 1176: timeout_ms = options.connection_timeout * 1000;
1177:
1.77 markus 1178: /* Open a connection to the remote host. */
1.385 djm 1179: if (ssh_connect(host, addrs, &hostaddr, options.port,
1180: options.address_family, options.connection_attempts,
1181: &timeout_ms, options.tcp_keep_alive,
1.388 djm 1182: options.use_privileged_port) != 0)
1.257 dtucker 1183: exit(255);
1.31 markus 1184:
1.391 djm 1185: if (addrs != NULL)
1186: freeaddrinfo(addrs);
1187:
1.385 djm 1188: packet_set_timeout(options.server_alive_interval,
1189: options.server_alive_count_max);
1190:
1.303 djm 1191: if (timeout_ms > 0)
1192: debug3("timeout: %d ms remain after connect", timeout_ms);
1193:
1.33 markus 1194: /*
1195: * If we successfully made the connection, load the host private key
1196: * in case we will need it later for combined rsa-rhosts
1197: * authentication. This must be done before releasing extra
1198: * privileges, because the file is only readable by root.
1.174 markus 1199: * If we cannot access the private keys, load the public keys
1200: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 1201: */
1.112 markus 1202: sensitive_data.nkeys = 0;
1203: sensitive_data.keys = NULL;
1.173 markus 1204: sensitive_data.external_keysign = 0;
1.178 markus 1205: if (options.rhosts_rsa_authentication ||
1206: options.hostbased_authentication) {
1.397 djm 1207: sensitive_data.nkeys = 9;
1.274 deraadt 1208: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 1209: sizeof(Key));
1.177 markus 1210:
1211: PRIV_START;
1.112 markus 1212: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 1213: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.411 djm 1214: sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA,
1.349 djm 1215: _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
1.411 djm 1216: sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519,
1217: _PATH_HOST_ED25519_KEY_FILE, "", NULL);
1.349 djm 1218: sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
1.345 djm 1219: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.411 djm 1220: sensitive_data.keys[4] = key_load_private_cert(KEY_DSA,
1221: _PATH_HOST_DSA_KEY_FILE, "", NULL);
1222: sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
1.349 djm 1223: _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1224: sensitive_data.keys[6] = key_load_private_type(KEY_ED25519,
1225: _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
1.397 djm 1226: sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
1.276 dtucker 1227: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1228: sensitive_data.keys[8] = key_load_private_type(KEY_DSA,
1229: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.177 markus 1230: PRIV_END;
1.173 markus 1231:
1.181 markus 1232: if (options.hostbased_authentication == 1 &&
1233: sensitive_data.keys[0] == NULL &&
1.349 djm 1234: sensitive_data.keys[5] == NULL &&
1.396 markus 1235: sensitive_data.keys[6] == NULL &&
1.397 djm 1236: sensitive_data.keys[7] == NULL &&
1237: sensitive_data.keys[8] == NULL) {
1.345 djm 1238: sensitive_data.keys[1] = key_load_cert(
1.411 djm 1239: _PATH_HOST_ECDSA_KEY_FILE);
1.345 djm 1240: sensitive_data.keys[2] = key_load_cert(
1.411 djm 1241: _PATH_HOST_ED25519_KEY_FILE);
1.349 djm 1242: sensitive_data.keys[3] = key_load_cert(
1.345 djm 1243: _PATH_HOST_RSA_KEY_FILE);
1.397 djm 1244: sensitive_data.keys[4] = key_load_cert(
1.411 djm 1245: _PATH_HOST_DSA_KEY_FILE);
1.397 djm 1246: sensitive_data.keys[5] = key_load_public(
1.411 djm 1247: _PATH_HOST_ECDSA_KEY_FILE, NULL);
1.397 djm 1248: sensitive_data.keys[6] = key_load_public(
1.411 djm 1249: _PATH_HOST_ED25519_KEY_FILE, NULL);
1.397 djm 1250: sensitive_data.keys[7] = key_load_public(
1.173 markus 1251: _PATH_HOST_RSA_KEY_FILE, NULL);
1.397 djm 1252: sensitive_data.keys[8] = key_load_public(
1.411 djm 1253: _PATH_HOST_DSA_KEY_FILE, NULL);
1.173 markus 1254: sensitive_data.external_keysign = 1;
1255: }
1.31 markus 1256: }
1.33 markus 1257: /*
1258: * Get rid of any extra privileges that we may have. We will no
1259: * longer need them. Also, extra privileges could make it very hard
1260: * to read identity files and other non-world-readable files from the
1261: * user's home directory if it happens to be on a NFS volume where
1262: * root is mapped to nobody.
1263: */
1.225 dtucker 1264: if (original_effective_uid == 0) {
1265: PRIV_START;
1266: permanently_set_uid(pw);
1267: }
1.31 markus 1268:
1.33 markus 1269: /*
1270: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 1271: * directory if it doesn't already exist.
1.33 markus 1272: */
1.367 djm 1273: if (config == NULL) {
1274: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1275: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1276: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1277: if (mkdir(buf, 0700) < 0)
1278: error("Could not create directory '%.200s'.",
1279: buf);
1280: }
1.31 markus 1281:
1.104 markus 1282: /* load options.identity_files */
1283: load_public_identity_files();
1284:
1285: /* Expand ~ in known host file names. */
1.361 djm 1286: tilde_expand_paths(options.system_hostfiles,
1287: options.num_system_hostfiles);
1288: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1289:
1290: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 1291: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1292:
1.316 djm 1293: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 1294: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1295: options.port, pw, timeout_ms);
1.339 djm 1296:
1297: if (packet_connection_is_on_socket()) {
1298: verbose("Authenticated to %s ([%s]:%d).", host,
1299: get_remote_ipaddr(), get_remote_port());
1300: } else {
1301: verbose("Authenticated to %s (via proxy).", host);
1302: }
1.31 markus 1303:
1.112 markus 1304: /* We no longer need the private host keys. Clear them now. */
1305: if (sensitive_data.nkeys != 0) {
1306: for (i = 0; i < sensitive_data.nkeys; i++) {
1307: if (sensitive_data.keys[i] != NULL) {
1308: /* Destroys contents safely */
1309: debug3("clear hostkey %d", i);
1310: key_free(sensitive_data.keys[i]);
1311: sensitive_data.keys[i] = NULL;
1312: }
1313: }
1.378 djm 1314: free(sensitive_data.keys);
1.134 markus 1315: }
1316: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1317: free(options.identity_files[i]);
1318: options.identity_files[i] = NULL;
1.134 markus 1319: if (options.identity_keys[i]) {
1320: key_free(options.identity_keys[i]);
1321: options.identity_keys[i] = NULL;
1322: }
1.112 markus 1323: }
1.426 djm 1324: for (i = 0; i < options.num_certificate_files; i++) {
1325: free(options.certificate_files[i]);
1326: options.certificate_files[i] = NULL;
1327: }
1.31 markus 1328:
1.45 markus 1329: exit_status = compat20 ? ssh_session2() : ssh_session();
1330: packet_close();
1.186 djm 1331:
1.312 djm 1332: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1333: unlink(options.control_path);
1334:
1.353 djm 1335: /* Kill ProxyCommand if it is running. */
1336: ssh_kill_proxy_command();
1.186 djm 1337:
1.45 markus 1338: return exit_status;
1339: }
1340:
1.344 djm 1341: static void
1342: control_persist_detach(void)
1343: {
1344: pid_t pid;
1.346 djm 1345: int devnull;
1.344 djm 1346:
1347: debug("%s: backgrounding master process", __func__);
1348:
1349: /*
1350: * master (current process) into the background, and make the
1351: * foreground process a client of the backgrounded master.
1352: */
1353: switch ((pid = fork())) {
1354: case -1:
1355: fatal("%s: fork: %s", __func__, strerror(errno));
1356: case 0:
1357: /* Child: master process continues mainloop */
1358: break;
1359: default:
1360: /* Parent: set up mux slave to connect to backgrounded master */
1361: debug2("%s: background process is %ld", __func__, (long)pid);
1362: stdin_null_flag = ostdin_null_flag;
1.359 djm 1363: options.request_tty = orequest_tty;
1.344 djm 1364: tty_flag = otty_flag;
1365: close(muxserver_sock);
1366: muxserver_sock = -1;
1.351 markus 1367: options.control_master = SSHCTL_MASTER_NO;
1.344 djm 1368: muxclient(options.control_path);
1369: /* muxclient() doesn't return on success. */
1370: fatal("Failed to connect to new control master");
1371: }
1.346 djm 1372: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1373: error("%s: open(\"/dev/null\"): %s", __func__,
1374: strerror(errno));
1375: } else {
1376: if (dup2(devnull, STDIN_FILENO) == -1 ||
1377: dup2(devnull, STDOUT_FILENO) == -1)
1378: error("%s: dup2: %s", __func__, strerror(errno));
1379: if (devnull > STDERR_FILENO)
1380: close(devnull);
1381: }
1.381 djm 1382: daemon(1, 1);
1.362 djm 1383: setproctitle("%s [mux]", options.control_path);
1.344 djm 1384: }
1385:
1386: /* Do fork() after authentication. Used by "ssh -f" */
1387: static void
1388: fork_postauth(void)
1389: {
1390: if (need_controlpersist_detach)
1391: control_persist_detach();
1392: debug("forking to background");
1393: fork_after_authentication_flag = 0;
1394: if (daemon(1, 1) < 0)
1395: fatal("daemon() failed: %.200s", strerror(errno));
1396: }
1397:
1.315 djm 1398: /* Callback for remote forward global requests */
1399: static void
1400: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1401: {
1.406 millert 1402: struct Forward *rfwd = (struct Forward *)ctxt;
1.315 djm 1403:
1.324 djm 1404: /* XXX verbose() on failure? */
1.404 markus 1405: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1406: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1407: rfwd->listen_path ? rfwd->listen_path :
1408: rfwd->listen_host ? rfwd->listen_host : "",
1409: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1410: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1411: rfwd->connect_host, rfwd->connect_port);
1412: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1413: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1414: rfwd->allocated_port = packet_get_int();
1415: logit("Allocated port %u for remote forward to %s:%d",
1416: rfwd->allocated_port,
1417: rfwd->connect_host, rfwd->connect_port);
1418: channel_update_permitted_opens(rfwd->handle,
1419: rfwd->allocated_port);
1420: } else {
1421: channel_update_permitted_opens(rfwd->handle, -1);
1422: }
1.324 djm 1423: }
1424:
1.315 djm 1425: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1426: if (options.exit_on_forward_failure) {
1427: if (rfwd->listen_path != NULL)
1428: fatal("Error: remote port forwarding failed "
1429: "for listen path %s", rfwd->listen_path);
1430: else
1431: fatal("Error: remote port forwarding failed "
1432: "for listen port %d", rfwd->listen_port);
1433: } else {
1434: if (rfwd->listen_path != NULL)
1435: logit("Warning: remote port forwarding failed "
1436: "for listen path %s", rfwd->listen_path);
1437: else
1438: logit("Warning: remote port forwarding failed "
1439: "for listen port %d", rfwd->listen_port);
1440: }
1.315 djm 1441: }
1.318 djm 1442: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1443: debug("All remote forwarding requests processed");
1.344 djm 1444: if (fork_after_authentication_flag)
1445: fork_postauth();
1.318 djm 1446: }
1.315 djm 1447: }
1448:
1.126 itojun 1449: static void
1.331 dtucker 1450: client_cleanup_stdio_fwd(int id, void *arg)
1451: {
1452: debug("stdio forwarding: done");
1453: cleanup_exit(0);
1454: }
1455:
1.368 djm 1456: static void
1.407 djm 1457: ssh_stdio_confirm(int id, int success, void *arg)
1458: {
1459: if (!success)
1460: fatal("stdio forwarding failed");
1461: }
1462:
1463: static void
1.368 djm 1464: ssh_init_stdio_forwarding(void)
1.331 dtucker 1465: {
1466: Channel *c;
1.332 djm 1467: int in, out;
1.331 dtucker 1468:
1.368 djm 1469: if (stdio_forward_host == NULL)
1470: return;
1.384 djm 1471: if (!compat20)
1.368 djm 1472: fatal("stdio forwarding require Protocol 2");
1473:
1474: debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port);
1.332 djm 1475:
1.368 djm 1476: if ((in = dup(STDIN_FILENO)) < 0 ||
1477: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1478: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.368 djm 1479: if ((c = channel_connect_stdio_fwd(stdio_forward_host,
1480: stdio_forward_port, in, out)) == NULL)
1481: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.331 dtucker 1482: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
1.407 djm 1483: channel_register_open_confirm(c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1484: }
1485:
1486: static void
1.70 markus 1487: ssh_init_forwarding(void)
1488: {
1.86 markus 1489: int success = 0;
1.70 markus 1490: int i;
1.331 dtucker 1491:
1.70 markus 1492: /* Initiate local TCP/IP port forwardings. */
1493: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1494: debug("Local connections to %.200s:%d forwarded to remote "
1495: "address %.200s:%d",
1.406 millert 1496: (options.local_forwards[i].listen_path != NULL) ?
1497: options.local_forwards[i].listen_path :
1.234 deraadt 1498: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1499: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1500: options.local_forwards[i].listen_host,
1501: options.local_forwards[i].listen_port,
1.406 millert 1502: (options.local_forwards[i].connect_path != NULL) ?
1503: options.local_forwards[i].connect_path :
1.232 djm 1504: options.local_forwards[i].connect_host,
1505: options.local_forwards[i].connect_port);
1.158 markus 1506: success += channel_setup_local_fwd_listener(
1.406 millert 1507: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1508: }
1.283 markus 1509: if (i > 0 && success != i && options.exit_on_forward_failure)
1510: fatal("Could not request local forwarding.");
1.86 markus 1511: if (i > 0 && success == 0)
1512: error("Could not request local forwarding.");
1.70 markus 1513:
1514: /* Initiate remote TCP/IP port forwardings. */
1515: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1516: debug("Remote connections from %.200s:%d forwarded to "
1517: "local address %.200s:%d",
1.406 millert 1518: (options.remote_forwards[i].listen_path != NULL) ?
1519: options.remote_forwards[i].listen_path :
1.248 djm 1520: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1521: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1522: options.remote_forwards[i].listen_port,
1.406 millert 1523: (options.remote_forwards[i].connect_path != NULL) ?
1524: options.remote_forwards[i].connect_path :
1.232 djm 1525: options.remote_forwards[i].connect_host,
1526: options.remote_forwards[i].connect_port);
1.366 markus 1527: options.remote_forwards[i].handle =
1528: channel_request_remote_forwarding(
1.406 millert 1529: &options.remote_forwards[i]);
1.366 markus 1530: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1531: if (options.exit_on_forward_failure)
1532: fatal("Could not request remote forwarding.");
1533: else
1534: logit("Warning: Could not request remote "
1535: "forwarding.");
1.366 markus 1536: } else {
1537: client_register_global_confirm(ssh_confirm_remote_forward,
1538: &options.remote_forwards[i]);
1.283 markus 1539: }
1.70 markus 1540: }
1.301 djm 1541:
1542: /* Initiate tunnel forwarding. */
1543: if (options.tun_open != SSH_TUNMODE_NO) {
1544: if (client_request_tun_fwd(options.tun_open,
1545: options.tun_local, options.tun_remote) == -1) {
1546: if (options.exit_on_forward_failure)
1547: fatal("Could not request tunnel forwarding.");
1548: else
1549: error("Could not request tunnel forwarding.");
1550: }
1551: }
1.70 markus 1552: }
1553:
1.126 itojun 1554: static void
1.70 markus 1555: check_agent_present(void)
1556: {
1.412 djm 1557: int r;
1558:
1.70 markus 1559: if (options.forward_agent) {
1.254 djm 1560: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1561: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1562: options.forward_agent = 0;
1.412 djm 1563: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1564: debug("ssh_get_authentication_socket: %s",
1565: ssh_err(r));
1566: }
1.70 markus 1567: }
1568: }
1569:
1.126 itojun 1570: static int
1.45 markus 1571: ssh_session(void)
1572: {
1573: int type;
1574: int interactive = 0;
1575: int have_tty = 0;
1576: struct winsize ws;
1577: char *cp;
1.243 djm 1578: const char *display;
1.45 markus 1579:
1.31 markus 1580: /* Enable compression if requested. */
1581: if (options.compression) {
1.316 djm 1582: debug("Requesting compression at level %d.",
1583: options.compression_level);
1.31 markus 1584:
1.316 djm 1585: if (options.compression_level < 1 ||
1586: options.compression_level > 9)
1587: fatal("Compression level must be from 1 (fast) to "
1588: "9 (slow, best).");
1.31 markus 1589:
1590: /* Send the request. */
1591: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1592: packet_put_int(options.compression_level);
1593: packet_send();
1594: packet_write_wait();
1.156 markus 1595: type = packet_read();
1.31 markus 1596: if (type == SSH_SMSG_SUCCESS)
1597: packet_start_compression(options.compression_level);
1598: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1599: logit("Warning: Remote host refused compression.");
1.31 markus 1600: else
1.316 djm 1601: packet_disconnect("Protocol error waiting for "
1602: "compression response.");
1.31 markus 1603: }
1604: /* Allocate a pseudo tty if appropriate. */
1605: if (tty_flag) {
1606: debug("Requesting pty.");
1607:
1608: /* Start the packet. */
1609: packet_start(SSH_CMSG_REQUEST_PTY);
1610:
1611: /* Store TERM in the packet. There is no limit on the
1612: length of the string. */
1613: cp = getenv("TERM");
1614: if (!cp)
1615: cp = "";
1.124 markus 1616: packet_put_cstring(cp);
1.31 markus 1617:
1618: /* Store window size in the packet. */
1619: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1620: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1621: packet_put_int((u_int)ws.ws_row);
1622: packet_put_int((u_int)ws.ws_col);
1623: packet_put_int((u_int)ws.ws_xpixel);
1624: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1625:
1626: /* Store tty modes in the packet. */
1.115 stevesk 1627: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1628:
1629: /* Send the packet, and wait for it to leave. */
1630: packet_send();
1631: packet_write_wait();
1632:
1633: /* Read response from the server. */
1.156 markus 1634: type = packet_read();
1.43 markus 1635: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1636: interactive = 1;
1.45 markus 1637: have_tty = 1;
1.43 markus 1638: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1639: logit("Warning: Remote host failed or refused to "
1640: "allocate a pseudo tty.");
1.31 markus 1641: else
1.316 djm 1642: packet_disconnect("Protocol error waiting for pty "
1643: "request response.");
1.31 markus 1644: }
1645: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1646: display = getenv("DISPLAY");
1.417 djm 1647: if (display == NULL && options.forward_x11)
1648: debug("X11 forwarding requested but DISPLAY not set");
1.243 djm 1649: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1650: char *proto, *data;
1.50 markus 1651: /* Get reasonable local authentication information. */
1.243 djm 1652: client_x11_get_proto(display, options.xauth_location,
1.384 djm 1653: options.forward_x11_trusted,
1.340 djm 1654: options.forward_x11_timeout,
1655: &proto, &data);
1.50 markus 1656: /* Request forwarding with authentication spoofing. */
1.316 djm 1657: debug("Requesting X11 forwarding with authentication "
1658: "spoofing.");
1.363 djm 1659: x11_request_forwarding_with_spoofing(0, display, proto,
1660: data, 0);
1.31 markus 1661: /* Read response from the server. */
1.156 markus 1662: type = packet_read();
1.31 markus 1663: if (type == SSH_SMSG_SUCCESS) {
1664: interactive = 1;
1.50 markus 1665: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 1666: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 1667: } else {
1.316 djm 1668: packet_disconnect("Protocol error waiting for X11 "
1669: "forwarding");
1.50 markus 1670: }
1.31 markus 1671: }
1672: /* Tell the packet module whether this is an interactive session. */
1.354 djm 1673: packet_set_interactive(interactive,
1674: options.ip_qos_interactive, options.ip_qos_bulk);
1.31 markus 1675:
1676: /* Request authentication agent forwarding if appropriate. */
1.70 markus 1677: check_agent_present();
1678:
1.31 markus 1679: if (options.forward_agent) {
1680: debug("Requesting authentication agent forwarding.");
1681: auth_request_forwarding();
1682:
1683: /* Read response from the server. */
1.156 markus 1684: type = packet_read();
1.155 markus 1685: packet_check_eom();
1.31 markus 1686: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1687: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1688: }
1689:
1.70 markus 1690: /* Initiate port forwardings. */
1.368 djm 1691: ssh_init_stdio_forwarding();
1.70 markus 1692: ssh_init_forwarding();
1.305 dtucker 1693:
1694: /* Execute a local command */
1695: if (options.local_command != NULL &&
1696: options.permit_local_command)
1697: ssh_local_cmd(options.local_command);
1.34 markus 1698:
1.318 djm 1699: /*
1700: * If requested and we are not interested in replies to remote
1701: * forwarding requests, then let ssh continue in the background.
1702: */
1.344 djm 1703: if (fork_after_authentication_flag) {
1704: if (options.exit_on_forward_failure &&
1705: options.num_remote_forwards > 0) {
1706: debug("deferring postauth fork until remote forward "
1707: "confirmation received");
1708: } else
1709: fork_postauth();
1.318 djm 1710: }
1.31 markus 1711:
1.33 markus 1712: /*
1713: * If a command was specified on the command line, execute the
1714: * command now. Otherwise request the server to start a shell.
1715: */
1.31 markus 1716: if (buffer_len(&command) > 0) {
1717: int len = buffer_len(&command);
1718: if (len > 900)
1719: len = 900;
1.316 djm 1720: debug("Sending command: %.*s", len,
1721: (u_char *)buffer_ptr(&command));
1.31 markus 1722: packet_start(SSH_CMSG_EXEC_CMD);
1723: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1724: packet_send();
1725: packet_write_wait();
1726: } else {
1727: debug("Requesting shell.");
1728: packet_start(SSH_CMSG_EXEC_SHELL);
1729: packet_send();
1730: packet_write_wait();
1731: }
1732:
1733: /* Enter the interactive session. */
1.119 stevesk 1734: return client_loop(have_tty, tty_flag ?
1735: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.89 markus 1736: }
1737:
1.214 djm 1738: /* request pty/x11/agent/tcpfwd/shell for channel */
1739: static void
1.337 djm 1740: ssh_session2_setup(int id, int success, void *arg)
1.214 djm 1741: {
1.215 djm 1742: extern char **environ;
1.243 djm 1743: const char *display;
1744: int interactive = tty_flag;
1.337 djm 1745:
1746: if (!success)
1747: return; /* No need for error message, channels code sens one */
1.215 djm 1748:
1.248 djm 1749: display = getenv("DISPLAY");
1.417 djm 1750: if (display == NULL && options.forward_x11)
1751: debug("X11 forwarding requested but DISPLAY not set");
1.243 djm 1752: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1753: char *proto, *data;
1.50 markus 1754: /* Get reasonable local authentication information. */
1.243 djm 1755: client_x11_get_proto(display, options.xauth_location,
1.340 djm 1756: options.forward_x11_trusted,
1757: options.forward_x11_timeout, &proto, &data);
1.50 markus 1758: /* Request forwarding with authentication spoofing. */
1.316 djm 1759: debug("Requesting X11 forwarding with authentication "
1760: "spoofing.");
1.363 djm 1761: x11_request_forwarding_with_spoofing(id, display, proto,
1762: data, 1);
1763: client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1764: /* XXX exit_on_forward_failure */
1.80 markus 1765: interactive = 1;
1.50 markus 1766: }
1767:
1.70 markus 1768: check_agent_present();
1769: if (options.forward_agent) {
1770: debug("Requesting authentication agent forwarding.");
1771: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1772: packet_send();
1.212 djm 1773: }
1.369 dtucker 1774:
1775: /* Tell the packet module whether this is an interactive session. */
1776: packet_set_interactive(interactive,
1777: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1778:
1.214 djm 1779: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1780: NULL, fileno(stdin), &command, environ);
1.45 markus 1781: }
1782:
1.143 markus 1783: /* open new channel for a session */
1.126 itojun 1784: static int
1.143 markus 1785: ssh_session2_open(void)
1.45 markus 1786: {
1.118 markus 1787: Channel *c;
1788: int window, packetmax, in, out, err;
1.60 markus 1789:
1.62 markus 1790: if (stdin_null_flag) {
1.93 itojun 1791: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1792: } else {
1793: in = dup(STDIN_FILENO);
1794: }
1.60 markus 1795: out = dup(STDOUT_FILENO);
1796: err = dup(STDERR_FILENO);
1.45 markus 1797:
1798: if (in < 0 || out < 0 || err < 0)
1.62 markus 1799: fatal("dup() in/out/err failed");
1.45 markus 1800:
1.69 markus 1801: /* enable nonblocking unless tty */
1802: if (!isatty(in))
1803: set_nonblock(in);
1804: if (!isatty(out))
1805: set_nonblock(out);
1806: if (!isatty(err))
1807: set_nonblock(err);
1808:
1.65 markus 1809: window = CHAN_SES_WINDOW_DEFAULT;
1810: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1811: if (tty_flag) {
1812: window >>= 1;
1813: packetmax >>= 1;
1.45 markus 1814: }
1.118 markus 1815: c = channel_new(
1.45 markus 1816: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1817: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1818: "client-session", /*nonblock*/0);
1.45 markus 1819:
1.143 markus 1820: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1821:
1.122 markus 1822: channel_send_open(c->self);
1.143 markus 1823: if (!no_shell_flag)
1.310 djm 1824: channel_register_open_confirm(c->self,
1825: ssh_session2_setup, NULL);
1.106 markus 1826:
1.118 markus 1827: return c->self;
1.106 markus 1828: }
1829:
1.126 itojun 1830: static int
1.106 markus 1831: ssh_session2(void)
1832: {
1.143 markus 1833: int id = -1;
1.106 markus 1834:
1835: /* XXX should be pre-session */
1.368 djm 1836: if (!options.control_persist)
1837: ssh_init_stdio_forwarding();
1.106 markus 1838: ssh_init_forwarding();
1839:
1.344 djm 1840: /* Start listening for multiplex clients */
1841: muxserver_listen();
1842:
1843: /*
1.368 djm 1844: * If we are in control persist mode and have a working mux listen
1845: * socket, then prepare to background ourselves and have a foreground
1846: * client attach as a control slave.
1847: * NB. we must save copies of the flags that we override for
1.344 djm 1848: * the backgrounding, since we defer attachment of the slave until
1849: * after the connection is fully established (in particular,
1850: * async rfwd replies have been received for ExitOnForwardFailure).
1851: */
1852: if (options.control_persist && muxserver_sock != -1) {
1853: ostdin_null_flag = stdin_null_flag;
1854: ono_shell_flag = no_shell_flag;
1.359 djm 1855: orequest_tty = options.request_tty;
1.344 djm 1856: otty_flag = tty_flag;
1857: stdin_null_flag = 1;
1858: no_shell_flag = 1;
1859: tty_flag = 0;
1860: if (!fork_after_authentication_flag)
1861: need_controlpersist_detach = 1;
1862: fork_after_authentication_flag = 1;
1863: }
1.368 djm 1864: /*
1865: * ControlPersist mux listen socket setup failed, attempt the
1866: * stdio forward setup that we skipped earlier.
1867: */
1868: if (options.control_persist && muxserver_sock == -1)
1869: ssh_init_stdio_forwarding();
1.344 djm 1870:
1.143 markus 1871: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1872: id = ssh_session2_open();
1.379 djm 1873: else {
1874: packet_set_interactive(
1875: options.control_master == SSHCTL_MASTER_NO,
1876: options.ip_qos_interactive, options.ip_qos_bulk);
1877: }
1.314 djm 1878:
1879: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1880: if (options.control_master == SSHCTL_MASTER_NO &&
1881: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1882: debug("Requesting no-more-sessions@openssh.com");
1883: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1884: packet_put_cstring("no-more-sessions@openssh.com");
1885: packet_put_char(0);
1886: packet_send();
1887: }
1.255 reyk 1888:
1889: /* Execute a local command */
1890: if (options.local_command != NULL &&
1891: options.permit_local_command)
1892: ssh_local_cmd(options.local_command);
1.301 djm 1893:
1.342 djm 1894: /*
1895: * If requested and we are not interested in replies to remote
1896: * forwarding requests, then let ssh continue in the background.
1897: */
1.344 djm 1898: if (fork_after_authentication_flag) {
1899: if (options.exit_on_forward_failure &&
1900: options.num_remote_forwards > 0) {
1901: debug("deferring postauth fork until remote forward "
1902: "confirmation received");
1903: } else
1904: fork_postauth();
1.318 djm 1905: }
1.327 andreas 1906:
1907: if (options.use_roaming)
1908: request_roaming();
1.31 markus 1909:
1.119 stevesk 1910: return client_loop(tty_flag, tty_flag ?
1911: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1912: }
1913:
1.426 djm 1914: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 1915: static void
1.104 markus 1916: load_public_identity_files(void)
1917: {
1.275 djm 1918: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1919: char *pwdir = NULL, *pwname = NULL;
1.104 markus 1920: Key *public;
1.275 djm 1921: struct passwd *pw;
1.426 djm 1922: int i;
1923: u_int n_ids, n_certs;
1.335 djm 1924: char *identity_files[SSH_MAX_IDENTITY_FILES];
1925: Key *identity_keys[SSH_MAX_IDENTITY_FILES];
1.426 djm 1926: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
1927: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 1928: #ifdef ENABLE_PKCS11
1.167 markus 1929: Key **keys;
1.333 markus 1930: int nkeys;
1.335 djm 1931: #endif /* PKCS11 */
1.104 markus 1932:
1.426 djm 1933: n_ids = n_certs = 0;
1.398 tedu 1934: memset(identity_files, 0, sizeof(identity_files));
1935: memset(identity_keys, 0, sizeof(identity_keys));
1.426 djm 1936: memset(certificate_files, 0, sizeof(certificate_files));
1937: memset(certificates, 0, sizeof(certificates));
1.335 djm 1938:
1939: #ifdef ENABLE_PKCS11
1.333 markus 1940: if (options.pkcs11_provider != NULL &&
1.167 markus 1941: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1942: (pkcs11_init(!options.batch_mode) == 0) &&
1943: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1944: &keys)) > 0) {
1945: for (i = 0; i < nkeys; i++) {
1.335 djm 1946: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1947: key_free(keys[i]);
1948: continue;
1949: }
1950: identity_keys[n_ids] = keys[i];
1951: identity_files[n_ids] =
1.333 markus 1952: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 1953: n_ids++;
1.167 markus 1954: }
1.378 djm 1955: free(keys);
1.127 markus 1956: }
1.333 markus 1957: #endif /* ENABLE_PKCS11 */
1.275 djm 1958: if ((pw = getpwuid(original_real_uid)) == NULL)
1959: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 1960: pwname = xstrdup(pw->pw_name);
1961: pwdir = xstrdup(pw->pw_dir);
1.275 djm 1962: if (gethostname(thishost, sizeof(thishost)) == -1)
1963: fatal("load_public_identity_files: gethostname: %s",
1964: strerror(errno));
1.335 djm 1965: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 1966: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
1967: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 1968: free(options.identity_files[i]);
1.426 djm 1969: options.identity_files[i] = NULL;
1.335 djm 1970: continue;
1971: }
1.275 djm 1972: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1973: original_real_uid);
1.306 deraadt 1974: filename = percent_expand(cp, "d", pwdir,
1975: "u", pwname, "l", thishost, "h", host,
1.275 djm 1976: "r", options.user, (char *)NULL);
1.378 djm 1977: free(cp);
1.131 millert 1978: public = key_load_public(filename, NULL);
1979: debug("identity file %s type %d", filename,
1980: public ? public->type : -1);
1.378 djm 1981: free(options.identity_files[i]);
1.335 djm 1982: identity_files[n_ids] = filename;
1983: identity_keys[n_ids] = public;
1984:
1985: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1986: continue;
1987:
1.426 djm 1988: /*
1989: * If no certificates have been explicitly listed then try
1990: * to add the default certificate variant too.
1991: */
1992: if (options.num_certificate_files != 0)
1993: continue;
1.335 djm 1994: xasprintf(&cp, "%s-cert", filename);
1995: public = key_load_public(cp, NULL);
1996: debug("identity file %s type %d", cp,
1997: public ? public->type : -1);
1998: if (public == NULL) {
1.378 djm 1999: free(cp);
1.335 djm 2000: continue;
2001: }
2002: if (!key_is_cert(public)) {
2003: debug("%s: key %s type %s is not a certificate",
2004: __func__, cp, key_type(public));
2005: key_free(public);
1.378 djm 2006: free(cp);
1.335 djm 2007: continue;
2008: }
2009: identity_keys[n_ids] = public;
1.426 djm 2010: identity_files[n_ids] = cp;
1.335 djm 2011: n_ids++;
2012: }
1.426 djm 2013:
2014: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
2015: fatal("%s: too many certificates", __func__);
2016: for (i = 0; i < options.num_certificate_files; i++) {
2017: cp = tilde_expand_filename(options.certificate_files[i],
2018: original_real_uid);
2019: filename = percent_expand(cp, "d", pwdir,
2020: "u", pwname, "l", thishost, "h", host,
2021: "r", options.user, (char *)NULL);
2022: free(cp);
2023:
2024: public = key_load_public(filename, NULL);
2025: debug("certificate file %s type %d", filename,
2026: public ? public->type : -1);
2027: free(options.certificate_files[i]);
2028: options.certificate_files[i] = NULL;
2029: if (public == NULL) {
2030: free(filename);
2031: continue;
2032: }
2033: if (!key_is_cert(public)) {
2034: debug("%s: key %s type %s is not a certificate",
2035: __func__, filename, key_type(public));
2036: key_free(public);
2037: free(filename);
2038: continue;
2039: }
2040: certificate_files[n_certs] = filename;
2041: certificates[n_certs] = public;
2042: ++n_certs;
2043: }
2044:
1.335 djm 2045: options.num_identity_files = n_ids;
2046: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2047: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.426 djm 2048:
2049: options.num_certificate_files = n_certs;
2050: memcpy(options.certificate_files,
2051: certificate_files, sizeof(certificate_files));
2052: memcpy(options.certificates, certificates, sizeof(certificates));
1.335 djm 2053:
1.398 tedu 2054: explicit_bzero(pwname, strlen(pwname));
1.378 djm 2055: free(pwname);
1.398 tedu 2056: explicit_bzero(pwdir, strlen(pwdir));
1.378 djm 2057: free(pwdir);
1.214 djm 2058: }
1.352 djm 2059:
2060: static void
2061: main_sigchld_handler(int sig)
2062: {
2063: int save_errno = errno;
2064: pid_t pid;
2065: int status;
2066:
2067: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
2068: (pid < 0 && errno == EINTR))
2069: ;
2070:
2071: signal(sig, main_sigchld_handler);
2072: errno = save_errno;
2073: }