bluhm@openbsd.org | 1112b53 | 2017-05-30 18:58:37 +0000 | [diff] [blame^] | 1 | /* $OpenBSD: ssh.c,v 1.461 2017/05/30 18:58:37 bluhm Exp $ */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 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 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 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. |
Darren Tucker | 0a118da | 2003-10-15 15:54:32 +1000 | [diff] [blame] | 17 | * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 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. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 41 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 42 | |
| 43 | #include "includes.h" |
Damien Miller | cd4223c | 2006-03-15 11:22:47 +1100 | [diff] [blame] | 44 | |
Damien Miller | f17883e | 2006-03-15 11:45:54 +1100 | [diff] [blame] | 45 | #include <sys/types.h> |
| 46 | #ifdef HAVE_SYS_STAT_H |
| 47 | # include <sys/stat.h> |
| 48 | #endif |
Damien Miller | cd4223c | 2006-03-15 11:22:47 +1100 | [diff] [blame] | 49 | #include <sys/resource.h> |
Damien Miller | 17e91c0 | 2006-03-15 11:28:34 +1100 | [diff] [blame] | 50 | #include <sys/ioctl.h> |
Damien Miller | e3b60b5 | 2006-07-10 21:08:03 +1000 | [diff] [blame] | 51 | #include <sys/socket.h> |
Damien Miller | 857b02e | 2010-09-24 22:02:56 +1000 | [diff] [blame] | 52 | #include <sys/wait.h> |
Damien Miller | 03e2003 | 2006-03-15 11:16:59 +1100 | [diff] [blame] | 53 | |
Damien Miller | c7b0636 | 2006-03-15 11:53:45 +1100 | [diff] [blame] | 54 | #include <ctype.h> |
Darren Tucker | ba72405 | 2006-07-12 22:24:22 +1000 | [diff] [blame] | 55 | #include <errno.h> |
Damien Miller | 57cf638 | 2006-07-10 21:13:46 +1000 | [diff] [blame] | 56 | #include <fcntl.h> |
Damien Miller | b8fe89c | 2006-07-24 14:51:00 +1000 | [diff] [blame] | 57 | #include <netdb.h> |
Damien Miller | 6645e7a | 2006-03-15 14:42:54 +1100 | [diff] [blame] | 58 | #ifdef HAVE_PATHS_H |
Damien Miller | 03e2003 | 2006-03-15 11:16:59 +1100 | [diff] [blame] | 59 | #include <paths.h> |
Damien Miller | 6645e7a | 2006-03-15 14:42:54 +1100 | [diff] [blame] | 60 | #endif |
Damien Miller | 9f2abc4 | 2006-07-10 20:53:08 +1000 | [diff] [blame] | 61 | #include <pwd.h> |
Damien Miller | 6ff3cad | 2006-03-15 11:52:09 +1100 | [diff] [blame] | 62 | #include <signal.h> |
Damien Miller | ded319c | 2006-09-01 15:38:36 +1000 | [diff] [blame] | 63 | #include <stdarg.h> |
Damien Miller | 2d00e63 | 2006-07-24 13:53:19 +1000 | [diff] [blame] | 64 | #include <stddef.h> |
Damien Miller | a7a73ee | 2006-08-05 11:37:59 +1000 | [diff] [blame] | 65 | #include <stdio.h> |
Damien Miller | e7a1e5c | 2006-08-05 11:34:19 +1000 | [diff] [blame] | 66 | #include <stdlib.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 67 | #include <string.h> |
Damien Miller | e6b3b61 | 2006-07-24 14:01:23 +1000 | [diff] [blame] | 68 | #include <unistd.h> |
deraadt@openbsd.org | 087266e | 2015-01-20 23:14:00 +0000 | [diff] [blame] | 69 | #include <limits.h> |
djm@openbsd.org | 65c6c6b | 2016-07-17 04:20:16 +0000 | [diff] [blame] | 70 | #include <locale.h> |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 71 | |
Darren Tucker | 46aa3e0 | 2006-09-02 15:32:40 +1000 | [diff] [blame] | 72 | #include <netinet/in.h> |
| 73 | #include <arpa/inet.h> |
| 74 | |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 75 | #ifdef WITH_OPENSSL |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 76 | #include <openssl/evp.h> |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 77 | #include <openssl/err.h> |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 78 | #endif |
Darren Tucker | bfaaf96 | 2008-02-28 19:13:52 +1100 | [diff] [blame] | 79 | #include "openbsd-compat/openssl-compat.h" |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 80 | #include "openbsd-compat/sys-queue.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 81 | |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 82 | #include "xmalloc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 83 | #include "ssh.h" |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 84 | #include "ssh2.h" |
Damien Miller | b96c441 | 2010-07-02 13:34:24 +1000 | [diff] [blame] | 85 | #include "canohost.h" |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 86 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 87 | #include "cipher.h" |
Damien Miller | 9c38643 | 2014-07-03 21:27:46 +1000 | [diff] [blame] | 88 | #include "digest.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 89 | #include "packet.h" |
| 90 | #include "buffer.h" |
Ben Lindstrom | c763767 | 2001-06-09 00:36:26 +0000 | [diff] [blame] | 91 | #include "channels.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 92 | #include "key.h" |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 93 | #include "authfd.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 94 | #include "authfile.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 95 | #include "pathnames.h" |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 96 | #include "dispatch.h" |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 97 | #include "clientloop.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 98 | #include "log.h" |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 99 | #include "misc.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 100 | #include "readconf.h" |
| 101 | #include "sshconnect.h" |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 102 | #include "kex.h" |
| 103 | #include "mac.h" |
Darren Tucker | 06f2bd8 | 2004-05-13 16:06:46 +1000 | [diff] [blame] | 104 | #include "sshpty.h" |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 105 | #include "match.h" |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 106 | #include "msg.h" |
Darren Tucker | 25f60a7 | 2004-08-15 17:23:34 +1000 | [diff] [blame] | 107 | #include "uidswap.h" |
Damien Miller | b757677 | 2006-07-10 20:23:39 +1000 | [diff] [blame] | 108 | #include "version.h" |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 109 | #include "ssherr.h" |
djm@openbsd.org | f9eca24 | 2015-07-30 00:01:34 +0000 | [diff] [blame] | 110 | #include "myproposal.h" |
Damien Miller | dda78a0 | 2016-12-12 13:57:10 +1100 | [diff] [blame] | 111 | #include "utf8.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 112 | |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 113 | #ifdef ENABLE_PKCS11 |
| 114 | #include "ssh-pkcs11.h" |
Ben Lindstrom | bcc1808 | 2001-08-06 21:59:25 +0000 | [diff] [blame] | 115 | #endif |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 116 | |
Damien Miller | 3f90587 | 1999-11-15 17:10:57 +1100 | [diff] [blame] | 117 | extern char *__progname; |
Damien Miller | 3f90587 | 1999-11-15 17:10:57 +1100 | [diff] [blame] | 118 | |
Damien Miller | ea2c1a4 | 2011-06-03 12:10:22 +1000 | [diff] [blame] | 119 | /* Saves a copy of argv for setproctitle emulation */ |
| 120 | #ifndef HAVE_SETPROCTITLE |
| 121 | static char **saved_av; |
| 122 | #endif |
| 123 | |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 124 | /* Flag indicating whether debug mode is on. May be set on the command line. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 125 | int debug_flag = 0; |
| 126 | |
Damien Miller | 21771e2 | 2011-05-15 08:45:50 +1000 | [diff] [blame] | 127 | /* Flag indicating whether a tty should be requested */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 128 | int tty_flag = 0; |
| 129 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 130 | /* don't exec a shell */ |
| 131 | int no_shell_flag = 0; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 132 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 133 | /* |
| 134 | * Flag indicating that nothing should be read from stdin. This can be set |
| 135 | * on the command line. |
| 136 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 137 | int stdin_null_flag = 0; |
| 138 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 139 | /* |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 140 | * Flag indicating that the current process should be backgrounded and |
| 141 | * a new slave launched in the foreground for ControlPersist. |
| 142 | */ |
| 143 | int need_controlpersist_detach = 0; |
| 144 | |
| 145 | /* Copies of flags for ControlPersist foreground slave */ |
Damien Miller | 21771e2 | 2011-05-15 08:45:50 +1000 | [diff] [blame] | 146 | int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty; |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 147 | |
| 148 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 149 | * Flag indicating that ssh should fork after authentication. This is useful |
Ben Lindstrom | f666fec | 2002-06-06 19:51:58 +0000 | [diff] [blame] | 150 | * so that the passphrase can be entered manually, and then ssh goes to the |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 151 | * background. |
| 152 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 153 | int fork_after_authentication_flag = 0; |
| 154 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 155 | /* |
| 156 | * General data structure for command line options and options configurable |
| 157 | * in configuration files. See readconf.h. |
| 158 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 159 | Options options; |
| 160 | |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 161 | /* optional user configfile */ |
| 162 | char *config = NULL; |
| 163 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 164 | /* |
| 165 | * Name of the host we are connecting to. This is the name given on the |
| 166 | * command line, or the HostName specified for the user-supplied name in a |
| 167 | * configuration file. |
| 168 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 169 | char *host; |
| 170 | |
| 171 | /* socket address the host resolves to */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 172 | struct sockaddr_storage hostaddr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 173 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 174 | /* Private host keys. */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 175 | Sensitive sensitive_data; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 176 | |
| 177 | /* Original real UID. */ |
| 178 | uid_t original_real_uid; |
Ben Lindstrom | f9c4884 | 2002-06-11 16:37:51 +0000 | [diff] [blame] | 179 | uid_t original_effective_uid; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 180 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 181 | /* command to be executed */ |
| 182 | Buffer command; |
| 183 | |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 184 | /* Should we execute a command or invoke a subsystem? */ |
| 185 | int subsystem_flag = 0; |
| 186 | |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame] | 187 | /* # of replies received for global requests */ |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 188 | static int remote_forward_confirms_received = 0; |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame] | 189 | |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 190 | /* mux.c */ |
| 191 | extern int muxserver_sock; |
| 192 | extern u_int muxclient_command; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 193 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 194 | /* Prints a help message to the user. This function never returns. */ |
| 195 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 196 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 197 | usage(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 198 | { |
Damien Miller | 5095510 | 2004-03-22 09:34:58 +1100 | [diff] [blame] | 199 | fprintf(stderr, |
jmc@openbsd.org | 4f1ca82 | 2017-05-02 08:06:33 +0000 | [diff] [blame] | 200 | "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n" |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 201 | " [-D [bind_address:]port] [-E log_file] [-e escape_char]\n" |
jmc@openbsd.org | e4eb7d9 | 2016-07-16 06:57:55 +0000 | [diff] [blame] | 202 | " [-F configfile] [-I pkcs11] [-i identity_file]\n" |
| 203 | " [-J [user@]host[:port]] [-L address] [-l login_name] [-m mac_spec]\n" |
| 204 | " [-O ctl_cmd] [-o option] [-p port] [-Q query_option] [-R address]\n" |
| 205 | " [-S ctl_path] [-W host:port] [-w local_tun[:remote_tun]]\n" |
| 206 | " [user@]hostname [command]\n" |
Damien Miller | 5095510 | 2004-03-22 09:34:58 +1100 | [diff] [blame] | 207 | ); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 208 | exit(255); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 209 | } |
| 210 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 211 | static int ssh_session2(void); |
| 212 | static void load_public_identity_files(void); |
Damien Miller | 857b02e | 2010-09-24 22:02:56 +1000 | [diff] [blame] | 213 | static void main_sigchld_handler(int); |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 214 | |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 215 | /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */ |
| 216 | static void |
| 217 | tilde_expand_paths(char **paths, u_int num_paths) |
| 218 | { |
| 219 | u_int i; |
| 220 | char *cp; |
| 221 | |
| 222 | for (i = 0; i < num_paths; i++) { |
| 223 | cp = tilde_expand_filename(paths[i], original_real_uid); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 224 | free(paths[i]); |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 225 | paths[i] = cp; |
| 226 | } |
| 227 | } |
| 228 | |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 229 | /* |
| 230 | * Attempt to resolve a host name / port to a set of addresses and |
| 231 | * optionally return any CNAMEs encountered along the way. |
| 232 | * Returns NULL on failure. |
| 233 | * NB. this function must operate with a options having undefined members. |
| 234 | */ |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 235 | static struct addrinfo * |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 236 | resolve_host(const char *name, int port, int logerr, char *cname, size_t clen) |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 237 | { |
| 238 | char strport[NI_MAXSERV]; |
| 239 | struct addrinfo hints, *res; |
| 240 | int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1; |
| 241 | |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 242 | if (port <= 0) |
| 243 | port = default_ssh_port(); |
| 244 | |
djm@openbsd.org | b1d38a3 | 2015-10-15 23:51:40 +0000 | [diff] [blame] | 245 | snprintf(strport, sizeof strport, "%d", port); |
Damien Miller | 1d2c456 | 2014-02-04 11:18:20 +1100 | [diff] [blame] | 246 | memset(&hints, 0, sizeof(hints)); |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 247 | hints.ai_family = options.address_family == -1 ? |
| 248 | AF_UNSPEC : options.address_family; |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 249 | hints.ai_socktype = SOCK_STREAM; |
| 250 | if (cname != NULL) |
| 251 | hints.ai_flags = AI_CANONNAME; |
| 252 | if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) { |
| 253 | if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA)) |
| 254 | loglevel = SYSLOG_LEVEL_ERROR; |
| 255 | do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s", |
| 256 | __progname, name, ssh_gai_strerror(gaierr)); |
| 257 | return NULL; |
| 258 | } |
| 259 | if (cname != NULL && res->ai_canonname != NULL) { |
| 260 | if (strlcpy(cname, res->ai_canonname, clen) >= clen) { |
| 261 | error("%s: host \"%s\" cname \"%s\" too long (max %lu)", |
| 262 | __func__, name, res->ai_canonname, (u_long)clen); |
| 263 | if (clen > 0) |
| 264 | *cname = '\0'; |
| 265 | } |
| 266 | } |
| 267 | return res; |
| 268 | } |
| 269 | |
| 270 | /* |
djm@openbsd.org | 9010902 | 2015-01-16 07:19:48 +0000 | [diff] [blame] | 271 | * Attempt to resolve a numeric host address / port to a single address. |
| 272 | * Returns a canonical address string. |
| 273 | * Returns NULL on failure. |
| 274 | * NB. this function must operate with a options having undefined members. |
| 275 | */ |
| 276 | static struct addrinfo * |
| 277 | resolve_addr(const char *name, int port, char *caddr, size_t clen) |
| 278 | { |
| 279 | char addr[NI_MAXHOST], strport[NI_MAXSERV]; |
| 280 | struct addrinfo hints, *res; |
| 281 | int gaierr; |
| 282 | |
| 283 | if (port <= 0) |
| 284 | port = default_ssh_port(); |
| 285 | snprintf(strport, sizeof strport, "%u", port); |
| 286 | memset(&hints, 0, sizeof(hints)); |
| 287 | hints.ai_family = options.address_family == -1 ? |
| 288 | AF_UNSPEC : options.address_family; |
| 289 | hints.ai_socktype = SOCK_STREAM; |
| 290 | hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV; |
| 291 | if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) { |
| 292 | debug2("%s: could not resolve name %.100s as address: %s", |
| 293 | __func__, name, ssh_gai_strerror(gaierr)); |
| 294 | return NULL; |
| 295 | } |
| 296 | if (res == NULL) { |
| 297 | debug("%s: getaddrinfo %.100s returned no addresses", |
| 298 | __func__, name); |
| 299 | return NULL; |
| 300 | } |
| 301 | if (res->ai_next != NULL) { |
| 302 | debug("%s: getaddrinfo %.100s returned multiple addresses", |
| 303 | __func__, name); |
| 304 | goto fail; |
| 305 | } |
| 306 | if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen, |
| 307 | addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) { |
| 308 | debug("%s: Could not format address for name %.100s: %s", |
| 309 | __func__, name, ssh_gai_strerror(gaierr)); |
| 310 | goto fail; |
| 311 | } |
| 312 | if (strlcpy(caddr, addr, clen) >= clen) { |
| 313 | error("%s: host \"%s\" addr \"%s\" too long (max %lu)", |
| 314 | __func__, name, addr, (u_long)clen); |
| 315 | if (clen > 0) |
| 316 | *caddr = '\0'; |
| 317 | fail: |
| 318 | freeaddrinfo(res); |
| 319 | return NULL; |
| 320 | } |
| 321 | return res; |
| 322 | } |
| 323 | |
| 324 | /* |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 325 | * Check whether the cname is a permitted replacement for the hostname |
| 326 | * and perform the replacement if it is. |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 327 | * NB. this function must operate with a options having undefined members. |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 328 | */ |
| 329 | static int |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 330 | check_follow_cname(int direct, char **namep, const char *cname) |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 331 | { |
| 332 | int i; |
| 333 | struct allowed_cname *rule; |
| 334 | |
| 335 | if (*cname == '\0' || options.num_permitted_cnames == 0 || |
| 336 | strcmp(*namep, cname) == 0) |
| 337 | return 0; |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 338 | if (options.canonicalize_hostname == SSH_CANONICALISE_NO) |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 339 | return 0; |
| 340 | /* |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 341 | * Don't attempt to canonicalize names that will be interpreted by |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 342 | * a proxy or jump host unless the user specifically requests so. |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 343 | */ |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 344 | if (!direct && |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 345 | options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS) |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 346 | return 0; |
| 347 | debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname); |
| 348 | for (i = 0; i < options.num_permitted_cnames; i++) { |
| 349 | rule = options.permitted_cnames + i; |
djm@openbsd.org | e661a86 | 2015-05-04 06:10:48 +0000 | [diff] [blame] | 350 | if (match_pattern_list(*namep, rule->source_list, 1) != 1 || |
| 351 | match_pattern_list(cname, rule->target_list, 1) != 1) |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 352 | continue; |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 353 | verbose("Canonicalized DNS aliased hostname " |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 354 | "\"%s\" => \"%s\"", *namep, cname); |
| 355 | free(*namep); |
| 356 | *namep = xstrdup(cname); |
| 357 | return 1; |
| 358 | } |
| 359 | return 0; |
| 360 | } |
| 361 | |
| 362 | /* |
| 363 | * Attempt to resolve the supplied hostname after applying the user's |
Damien Miller | 51682fa | 2013-10-17 11:48:31 +1100 | [diff] [blame] | 364 | * canonicalization rules. Returns the address list for the host or NULL |
| 365 | * if no name was found after canonicalization. |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 366 | * NB. this function must operate with a options having undefined members. |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 367 | */ |
| 368 | static struct addrinfo * |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 369 | resolve_canonicalize(char **hostp, int port) |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 370 | { |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 371 | int i, direct, ndots; |
djm@openbsd.org | 9010902 | 2015-01-16 07:19:48 +0000 | [diff] [blame] | 372 | char *cp, *fullhost, newname[NI_MAXHOST]; |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 373 | struct addrinfo *addrs; |
| 374 | |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 375 | if (options.canonicalize_hostname == SSH_CANONICALISE_NO) |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 376 | return NULL; |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 377 | |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 378 | /* |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 379 | * Don't attempt to canonicalize names that will be interpreted by |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 380 | * a proxy unless the user specifically requests so. |
| 381 | */ |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 382 | direct = option_clear_or_none(options.proxy_command) && |
| 383 | options.jump_host == NULL; |
| 384 | if (!direct && |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 385 | options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS) |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 386 | return NULL; |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 387 | |
djm@openbsd.org | 9010902 | 2015-01-16 07:19:48 +0000 | [diff] [blame] | 388 | /* Try numeric hostnames first */ |
| 389 | if ((addrs = resolve_addr(*hostp, port, |
| 390 | newname, sizeof(newname))) != NULL) { |
| 391 | debug2("%s: hostname %.100s is address", __func__, *hostp); |
| 392 | if (strcasecmp(*hostp, newname) != 0) { |
| 393 | debug2("%s: canonicalised address \"%s\" => \"%s\"", |
| 394 | __func__, *hostp, newname); |
| 395 | free(*hostp); |
| 396 | *hostp = xstrdup(newname); |
| 397 | } |
| 398 | return addrs; |
| 399 | } |
| 400 | |
djm@openbsd.org | 5ee0063 | 2015-10-16 18:40:49 +0000 | [diff] [blame] | 401 | /* If domain name is anchored, then resolve it now */ |
| 402 | if ((*hostp)[strlen(*hostp) - 1] == '.') { |
| 403 | debug3("%s: name is fully qualified", __func__); |
| 404 | fullhost = xstrdup(*hostp); |
| 405 | if ((addrs = resolve_host(fullhost, port, 0, |
| 406 | newname, sizeof(newname))) != NULL) |
| 407 | goto found; |
| 408 | free(fullhost); |
| 409 | goto notfound; |
| 410 | } |
| 411 | |
Damien Miller | 51682fa | 2013-10-17 11:48:31 +1100 | [diff] [blame] | 412 | /* Don't apply canonicalization to sufficiently-qualified hostnames */ |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 413 | ndots = 0; |
| 414 | for (cp = *hostp; *cp != '\0'; cp++) { |
| 415 | if (*cp == '.') |
| 416 | ndots++; |
| 417 | } |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 418 | if (ndots > options.canonicalize_max_dots) { |
| 419 | debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)", |
| 420 | __func__, *hostp, options.canonicalize_max_dots); |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 421 | return NULL; |
| 422 | } |
| 423 | /* Attempt each supplied suffix */ |
| 424 | for (i = 0; i < options.num_canonical_domains; i++) { |
djm@openbsd.org | 9010902 | 2015-01-16 07:19:48 +0000 | [diff] [blame] | 425 | *newname = '\0'; |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 426 | xasprintf(&fullhost, "%s.%s.", *hostp, |
| 427 | options.canonical_domains[i]); |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 428 | debug3("%s: attempting \"%s\" => \"%s\"", __func__, |
| 429 | *hostp, fullhost); |
| 430 | if ((addrs = resolve_host(fullhost, port, 0, |
djm@openbsd.org | 9010902 | 2015-01-16 07:19:48 +0000 | [diff] [blame] | 431 | newname, sizeof(newname))) == NULL) { |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 432 | free(fullhost); |
| 433 | continue; |
| 434 | } |
djm@openbsd.org | 5ee0063 | 2015-10-16 18:40:49 +0000 | [diff] [blame] | 435 | found: |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 436 | /* Remove trailing '.' */ |
| 437 | fullhost[strlen(fullhost) - 1] = '\0'; |
| 438 | /* Follow CNAME if requested */ |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 439 | if (!check_follow_cname(direct, &fullhost, newname)) { |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 440 | debug("Canonicalized hostname \"%s\" => \"%s\"", |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 441 | *hostp, fullhost); |
| 442 | } |
| 443 | free(*hostp); |
| 444 | *hostp = fullhost; |
| 445 | return addrs; |
| 446 | } |
djm@openbsd.org | 5ee0063 | 2015-10-16 18:40:49 +0000 | [diff] [blame] | 447 | notfound: |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 448 | if (!options.canonicalize_fallback_local) |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 449 | fatal("%s: Could not resolve host \"%s\"", __progname, *hostp); |
| 450 | debug2("%s: host %s not found in any suffix", __func__, *hostp); |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 451 | return NULL; |
| 452 | } |
| 453 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 454 | /* |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 455 | * Read per-user configuration file. Ignore the system wide config |
| 456 | * file if the user specifies a config file on the command line. |
| 457 | */ |
| 458 | static void |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 459 | process_config_files(const char *host_arg, struct passwd *pw, int post_canon) |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 460 | { |
deraadt@openbsd.org | 087266e | 2015-01-20 23:14:00 +0000 | [diff] [blame] | 461 | char buf[PATH_MAX]; |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 462 | int r; |
| 463 | |
| 464 | if (config != NULL) { |
| 465 | if (strcasecmp(config, "none") != 0 && |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 466 | !read_config_file(config, pw, host, host_arg, &options, |
| 467 | SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0))) |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 468 | fatal("Can't open user config file %.100s: " |
| 469 | "%.100s", config, strerror(errno)); |
| 470 | } else { |
| 471 | r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, |
| 472 | _PATH_SSH_USER_CONFFILE); |
| 473 | if (r > 0 && (size_t)r < sizeof(buf)) |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 474 | (void)read_config_file(buf, pw, host, host_arg, |
| 475 | &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF | |
| 476 | (post_canon ? SSHCONF_POSTCANON : 0)); |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 477 | |
| 478 | /* Read systemwide configuration file after user config. */ |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 479 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw, |
| 480 | host, host_arg, &options, |
| 481 | post_canon ? SSHCONF_POSTCANON : 0); |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | /* Rewrite the port number in an addrinfo list of addresses */ |
| 486 | static void |
| 487 | set_addrinfo_port(struct addrinfo *addrs, int port) |
| 488 | { |
| 489 | struct addrinfo *addr; |
| 490 | |
| 491 | for (addr = addrs; addr != NULL; addr = addr->ai_next) { |
| 492 | switch (addr->ai_family) { |
| 493 | case AF_INET: |
| 494 | ((struct sockaddr_in *)addr->ai_addr)-> |
| 495 | sin_port = htons(port); |
| 496 | break; |
| 497 | case AF_INET6: |
| 498 | ((struct sockaddr_in6 *)addr->ai_addr)-> |
| 499 | sin6_port = htons(port); |
| 500 | break; |
| 501 | } |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 502 | } |
| 503 | } |
| 504 | |
| 505 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 506 | * Main program for the ssh client. |
| 507 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 508 | int |
| 509 | main(int ac, char **av) |
| 510 | { |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 511 | struct ssh *ssh = NULL; |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 512 | int i, r, opt, exit_status, use_syslog, direct, config_test = 0; |
deraadt@openbsd.org | 087266e | 2015-01-20 23:14:00 +0000 | [diff] [blame] | 513 | char *p, *cp, *line, *argv0, buf[PATH_MAX], *host_arg, *logfile; |
Damien Miller | dfc85fa | 2011-05-15 08:44:02 +1000 | [diff] [blame] | 514 | char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV]; |
djm@openbsd.org | 674b3b6 | 2015-09-11 03:47:28 +0000 | [diff] [blame] | 515 | char cname[NI_MAXHOST], uidstr[32], *conn_hash_hex; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 516 | struct stat st; |
Ben Lindstrom | 086cf21 | 2001-03-05 05:56:40 +0000 | [diff] [blame] | 517 | struct passwd *pw; |
Damien Miller | 194fd90 | 2013-10-15 12:13:05 +1100 | [diff] [blame] | 518 | int timeout_ms; |
Ben Lindstrom | 5ccf63a | 2001-09-24 20:00:10 +0000 | [diff] [blame] | 519 | extern int optind, optreset; |
Damien Miller | 4f8e669 | 2001-07-14 13:22:53 +1000 | [diff] [blame] | 520 | extern char *optarg; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 521 | struct Forward fwd; |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 522 | struct addrinfo *addrs = NULL; |
Damien Miller | 9c38643 | 2014-07-03 21:27:46 +1000 | [diff] [blame] | 523 | struct ssh_digest_ctx *md; |
| 524 | u_char conn_hash[SSH_DIGEST_MAX_LENGTH]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 525 | |
dtucker@openbsd.org | ffb1e7e | 2016-02-15 09:47:49 +0000 | [diff] [blame] | 526 | ssh_malloc_init(); /* must be called before any mallocs */ |
Darren Tucker | ce321d8 | 2005-10-03 18:11:24 +1000 | [diff] [blame] | 527 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
| 528 | sanitise_stdfd(); |
| 529 | |
Damien Miller | 59d3d5b | 2003-08-22 09:34:41 +1000 | [diff] [blame] | 530 | __progname = ssh_get_progname(av[0]); |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 531 | |
Damien Miller | ea2c1a4 | 2011-06-03 12:10:22 +1000 | [diff] [blame] | 532 | #ifndef HAVE_SETPROCTITLE |
| 533 | /* Prepare for later setproctitle emulation */ |
| 534 | /* Save argv so it isn't clobbered by setproctitle() emulation */ |
| 535 | saved_av = xcalloc(ac + 1, sizeof(*saved_av)); |
| 536 | for (i = 0; i < ac; i++) |
| 537 | saved_av[i] = xstrdup(av[i]); |
| 538 | saved_av[i] = NULL; |
| 539 | compat_init_setproctitle(ac, av); |
| 540 | av = saved_av; |
| 541 | #endif |
| 542 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 543 | /* |
Damien Miller | 00d9ae2 | 2010-08-17 01:59:31 +1000 | [diff] [blame] | 544 | * Discard other fds that are hanging around. These can cause problem |
| 545 | * with backgrounded ssh processes started by ControlPersist. |
| 546 | */ |
| 547 | closefrom(STDERR_FILENO + 1); |
| 548 | |
| 549 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 550 | * Save the original real uid. It will be needed later (uid-swapping |
| 551 | * may clobber the real uid). |
| 552 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 553 | original_real_uid = getuid(); |
| 554 | original_effective_uid = geteuid(); |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 555 | |
Damien Miller | 50b9a60 | 2002-09-04 16:50:06 +1000 | [diff] [blame] | 556 | /* |
| 557 | * Use uid-swapping to give up root privileges for the duration of |
| 558 | * option processing. We will re-instantiate the rights when we are |
| 559 | * ready to create the privileged port, and will permanently drop |
| 560 | * them when the port has been created (actually, when the connection |
| 561 | * has been made, as we may need to create the port several times). |
| 562 | */ |
| 563 | PRIV_END; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 564 | |
Damien Miller | 05dd795 | 2000-10-01 00:42:48 +1100 | [diff] [blame] | 565 | #ifdef HAVE_SETRLIMIT |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 566 | /* If we are installed setuid root be careful to not drop core. */ |
| 567 | if (original_real_uid != original_effective_uid) { |
| 568 | struct rlimit rlim; |
| 569 | rlim.rlim_cur = rlim.rlim_max = 0; |
| 570 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) |
| 571 | fatal("setrlimit failed: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 572 | } |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 573 | #endif |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 574 | /* Get user data. */ |
| 575 | pw = getpwuid(original_real_uid); |
| 576 | if (!pw) { |
Damien Miller | 3009d3c | 2013-07-20 13:22:31 +1000 | [diff] [blame] | 577 | logit("No user exists for uid %lu", (u_long)original_real_uid); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 578 | exit(255); |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 579 | } |
| 580 | /* Take a copy of the returned structure. */ |
| 581 | pw = pwcopy(pw); |
| 582 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 583 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 584 | * Set our umask to something reasonable, as some files are created |
| 585 | * with the default umask. This will make them world-readable but |
| 586 | * writable only by the owner, which is ok for all files for which we |
| 587 | * don't set the modes explicitly. |
| 588 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 589 | umask(022); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 590 | |
Damien Miller | dda78a0 | 2016-12-12 13:57:10 +1100 | [diff] [blame] | 591 | msetlocale(); |
djm@openbsd.org | 65c6c6b | 2016-07-17 04:20:16 +0000 | [diff] [blame] | 592 | |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 593 | /* |
| 594 | * Initialize option structure to indicate that no values have been |
| 595 | * set. |
| 596 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 597 | initialize_options(&options); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 598 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 599 | /* Parse command-line arguments. */ |
| 600 | host = NULL; |
Damien Miller | e272a5b | 2008-11-03 19:22:37 +1100 | [diff] [blame] | 601 | use_syslog = 0; |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 602 | logfile = NULL; |
Darren Tucker | 72efd74 | 2009-06-21 17:48:00 +1000 | [diff] [blame] | 603 | argv0 = av[0]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 604 | |
Damien Miller | 2ecb6bd | 2006-03-15 12:03:53 +1100 | [diff] [blame] | 605 | again: |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 606 | while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx" |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 607 | "ACD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 608 | switch (opt) { |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 609 | case '1': |
djm@openbsd.org | 99f95ba | 2017-04-30 23:11:45 +0000 | [diff] [blame] | 610 | fatal("SSH protocol v.1 is no longer supported"); |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 611 | break; |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 612 | case '2': |
djm@openbsd.org | 99f95ba | 2017-04-30 23:11:45 +0000 | [diff] [blame] | 613 | /* Ignored */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 614 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 615 | case '4': |
Darren Tucker | 0a4f04b | 2003-07-03 20:37:47 +1000 | [diff] [blame] | 616 | options.address_family = AF_INET; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 617 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 618 | case '6': |
Darren Tucker | 0a4f04b | 2003-07-03 20:37:47 +1000 | [diff] [blame] | 619 | options.address_family = AF_INET6; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 620 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 621 | case 'n': |
| 622 | stdin_null_flag = 1; |
| 623 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 624 | case 'f': |
| 625 | fork_after_authentication_flag = 1; |
| 626 | stdin_null_flag = 1; |
| 627 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 628 | case 'x': |
| 629 | options.forward_x11 = 0; |
| 630 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 631 | case 'X': |
| 632 | options.forward_x11 = 1; |
| 633 | break; |
Damien Miller | e272a5b | 2008-11-03 19:22:37 +1100 | [diff] [blame] | 634 | case 'y': |
| 635 | use_syslog = 1; |
| 636 | break; |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 637 | case 'E': |
dtucker@openbsd.org | 4f7cc2f | 2015-09-04 08:21:47 +0000 | [diff] [blame] | 638 | logfile = optarg; |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 639 | break; |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 640 | case 'G': |
| 641 | config_test = 1; |
| 642 | break; |
Darren Tucker | 0a118da | 2003-10-15 15:54:32 +1000 | [diff] [blame] | 643 | case 'Y': |
| 644 | options.forward_x11 = 1; |
| 645 | options.forward_x11_trusted = 1; |
| 646 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 647 | case 'g': |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 648 | options.fwd_opts.gateway_ports = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 649 | break; |
Darren Tucker | 7ebfc10 | 2004-11-07 20:06:19 +1100 | [diff] [blame] | 650 | case 'O': |
dtucker@openbsd.org | 8543ff3 | 2016-06-03 03:14:41 +0000 | [diff] [blame] | 651 | if (options.stdio_forward_host != NULL) |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 652 | fatal("Cannot specify multiplexing " |
| 653 | "command with -W"); |
| 654 | else if (muxclient_command != 0) |
| 655 | fatal("Multiplexing command already specified"); |
Darren Tucker | 7ebfc10 | 2004-11-07 20:06:19 +1100 | [diff] [blame] | 656 | if (strcmp(optarg, "check") == 0) |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 657 | muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK; |
Damien Miller | 388f6fc | 2010-05-21 14:57:35 +1000 | [diff] [blame] | 658 | else if (strcmp(optarg, "forward") == 0) |
| 659 | muxclient_command = SSHMUX_COMMAND_FORWARD; |
Darren Tucker | 7ebfc10 | 2004-11-07 20:06:19 +1100 | [diff] [blame] | 660 | else if (strcmp(optarg, "exit") == 0) |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 661 | muxclient_command = SSHMUX_COMMAND_TERMINATE; |
Damien Miller | 6c3eec7 | 2011-05-05 14:16:22 +1000 | [diff] [blame] | 662 | else if (strcmp(optarg, "stop") == 0) |
| 663 | muxclient_command = SSHMUX_COMMAND_STOP; |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 664 | else if (strcmp(optarg, "cancel") == 0) |
| 665 | muxclient_command = SSHMUX_COMMAND_CANCEL_FWD; |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 666 | else if (strcmp(optarg, "proxy") == 0) |
| 667 | muxclient_command = SSHMUX_COMMAND_PROXY; |
Darren Tucker | 7ebfc10 | 2004-11-07 20:06:19 +1100 | [diff] [blame] | 668 | else |
| 669 | fatal("Invalid multiplex command."); |
| 670 | break; |
Damien Miller | 147bba3 | 2002-09-04 16:46:06 +1000 | [diff] [blame] | 671 | case 'P': /* deprecated */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 672 | options.use_privileged_port = 0; |
| 673 | break; |
Damien Miller | d937dc0 | 2013-12-05 10:19:54 +1100 | [diff] [blame] | 674 | case 'Q': |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 675 | cp = NULL; |
Damien Miller | d937dc0 | 2013-12-05 10:19:54 +1100 | [diff] [blame] | 676 | if (strcmp(optarg, "cipher") == 0) |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 677 | cp = cipher_alg_list('\n', 0); |
Damien Miller | d937dc0 | 2013-12-05 10:19:54 +1100 | [diff] [blame] | 678 | else if (strcmp(optarg, "cipher-auth") == 0) |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 679 | cp = cipher_alg_list('\n', 1); |
Damien Miller | d937dc0 | 2013-12-05 10:19:54 +1100 | [diff] [blame] | 680 | else if (strcmp(optarg, "mac") == 0) |
Damien Miller | 690d989 | 2013-11-08 12:16:49 +1100 | [diff] [blame] | 681 | cp = mac_alg_list('\n'); |
Damien Miller | d937dc0 | 2013-12-05 10:19:54 +1100 | [diff] [blame] | 682 | else if (strcmp(optarg, "kex") == 0) |
Damien Miller | 690d989 | 2013-11-08 12:16:49 +1100 | [diff] [blame] | 683 | cp = kex_alg_list('\n'); |
Damien Miller | d937dc0 | 2013-12-05 10:19:54 +1100 | [diff] [blame] | 684 | else if (strcmp(optarg, "key") == 0) |
djm@openbsd.org | 183ba55 | 2017-03-10 04:07:20 +0000 | [diff] [blame] | 685 | cp = sshkey_alg_list(0, 0, 0, '\n'); |
Damien Miller | 5be9d9e | 2013-12-07 11:24:01 +1100 | [diff] [blame] | 686 | else if (strcmp(optarg, "key-cert") == 0) |
djm@openbsd.org | 183ba55 | 2017-03-10 04:07:20 +0000 | [diff] [blame] | 687 | cp = sshkey_alg_list(1, 0, 0, '\n'); |
Damien Miller | 5be9d9e | 2013-12-07 11:24:01 +1100 | [diff] [blame] | 688 | else if (strcmp(optarg, "key-plain") == 0) |
djm@openbsd.org | 183ba55 | 2017-03-10 04:07:20 +0000 | [diff] [blame] | 689 | cp = sshkey_alg_list(0, 1, 0, '\n'); |
djm@openbsd.org | 68d2dfc | 2015-03-03 06:48:58 +0000 | [diff] [blame] | 690 | else if (strcmp(optarg, "protocol-version") == 0) { |
djm@openbsd.org | 68d2dfc | 2015-03-03 06:48:58 +0000 | [diff] [blame] | 691 | cp = xstrdup("2"); |
djm@openbsd.org | 68d2dfc | 2015-03-03 06:48:58 +0000 | [diff] [blame] | 692 | } |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 693 | if (cp == NULL) |
| 694 | fatal("Unsupported query \"%s\"", optarg); |
| 695 | printf("%s\n", cp); |
| 696 | free(cp); |
| 697 | exit(0); |
| 698 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 699 | case 'a': |
| 700 | options.forward_agent = 0; |
| 701 | break; |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 702 | case 'A': |
| 703 | options.forward_agent = 1; |
| 704 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 705 | case 'k': |
Damien Miller | e0113cc | 2003-11-24 13:10:09 +1100 | [diff] [blame] | 706 | options.gss_deleg_creds = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 707 | break; |
Darren Tucker | 415bddc | 2007-06-12 23:43:16 +1000 | [diff] [blame] | 708 | case 'K': |
| 709 | options.gss_authentication = 1; |
| 710 | options.gss_deleg_creds = 1; |
| 711 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 712 | case 'i': |
dtucker@openbsd.org | 03239c1 | 2015-10-25 23:42:00 +0000 | [diff] [blame] | 713 | p = tilde_expand_filename(optarg, original_real_uid); |
| 714 | if (stat(p, &st) < 0) |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 715 | fprintf(stderr, "Warning: Identity file %s " |
dtucker@openbsd.org | 03239c1 | 2015-10-25 23:42:00 +0000 | [diff] [blame] | 716 | "not accessible: %s.\n", p, |
Damien Miller | 3eb48b6 | 2005-03-01 21:15:46 +1100 | [diff] [blame] | 717 | strerror(errno)); |
dtucker@openbsd.org | 03239c1 | 2015-10-25 23:42:00 +0000 | [diff] [blame] | 718 | else |
| 719 | add_identity_file(&options, NULL, p, 1); |
| 720 | free(p); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 721 | break; |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 722 | case 'I': |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 723 | #ifdef ENABLE_PKCS11 |
dtucker@openbsd.org | 4f7cc2f | 2015-09-04 08:21:47 +0000 | [diff] [blame] | 724 | free(options.pkcs11_provider); |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 725 | options.pkcs11_provider = xstrdup(optarg); |
Ben Lindstrom | bcc1808 | 2001-08-06 21:59:25 +0000 | [diff] [blame] | 726 | #else |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 727 | fprintf(stderr, "no support for PKCS#11.\n"); |
Ben Lindstrom | bcc1808 | 2001-08-06 21:59:25 +0000 | [diff] [blame] | 728 | #endif |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 729 | break; |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 730 | case 'J': |
| 731 | if (options.jump_host != NULL) |
| 732 | fatal("Only a single -J option permitted"); |
| 733 | if (options.proxy_command != NULL) |
| 734 | fatal("Cannot specify -J with ProxyCommand"); |
| 735 | if (parse_jump(optarg, &options, 1) == -1) |
| 736 | fatal("Invalid -J argument"); |
| 737 | options.proxy_command = xstrdup("none"); |
| 738 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 739 | case 't': |
Damien Miller | 21771e2 | 2011-05-15 08:45:50 +1000 | [diff] [blame] | 740 | if (options.request_tty == REQUEST_TTY_YES) |
| 741 | options.request_tty = REQUEST_TTY_FORCE; |
| 742 | else |
| 743 | options.request_tty = REQUEST_TTY_YES; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 744 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 745 | case 'v': |
Darren Tucker | e98dfa3 | 2003-07-19 19:54:31 +1000 | [diff] [blame] | 746 | if (debug_flag == 0) { |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 747 | debug_flag = 1; |
| 748 | options.log_level = SYSLOG_LEVEL_DEBUG1; |
Darren Tucker | e98dfa3 | 2003-07-19 19:54:31 +1000 | [diff] [blame] | 749 | } else { |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 750 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) { |
| 751 | debug_flag++; |
Darren Tucker | e98dfa3 | 2003-07-19 19:54:31 +1000 | [diff] [blame] | 752 | options.log_level++; |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 753 | } |
Darren Tucker | e98dfa3 | 2003-07-19 19:54:31 +1000 | [diff] [blame] | 754 | } |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 755 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 756 | case 'V': |
Damien Miller | 0c889cd | 2004-03-22 09:36:00 +1100 | [diff] [blame] | 757 | fprintf(stderr, "%s, %s\n", |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 758 | SSH_RELEASE, |
| 759 | #ifdef WITH_OPENSSL |
| 760 | SSLeay_version(SSLEAY_VERSION) |
| 761 | #else |
| 762 | "without OpenSSL" |
| 763 | #endif |
| 764 | ); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 765 | if (opt == 'V') |
| 766 | exit(0); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 767 | break; |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 768 | case 'w': |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 769 | if (options.tun_open == -1) |
| 770 | options.tun_open = SSH_TUNMODE_DEFAULT; |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 771 | options.tun_local = a2tun(optarg, &options.tun_remote); |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 772 | if (options.tun_local == SSH_TUNID_ERR) { |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 773 | fprintf(stderr, |
| 774 | "Bad tun device '%s'\n", optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 775 | exit(255); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 776 | } |
| 777 | break; |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 778 | case 'W': |
dtucker@openbsd.org | 8543ff3 | 2016-06-03 03:14:41 +0000 | [diff] [blame] | 779 | if (options.stdio_forward_host != NULL) |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 780 | fatal("stdio forward already specified"); |
| 781 | if (muxclient_command != 0) |
| 782 | fatal("Cannot specify stdio forward with -O"); |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 783 | if (parse_forward(&fwd, optarg, 1, 0)) { |
dtucker@openbsd.org | 8543ff3 | 2016-06-03 03:14:41 +0000 | [diff] [blame] | 784 | options.stdio_forward_host = fwd.listen_host; |
| 785 | options.stdio_forward_port = fwd.listen_port; |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 786 | free(fwd.connect_host); |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 787 | } else { |
| 788 | fprintf(stderr, |
| 789 | "Bad stdio forwarding specification '%s'\n", |
| 790 | optarg); |
| 791 | exit(255); |
| 792 | } |
Damien Miller | 21771e2 | 2011-05-15 08:45:50 +1000 | [diff] [blame] | 793 | options.request_tty = REQUEST_TTY_NO; |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 794 | no_shell_flag = 1; |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 795 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 796 | case 'q': |
| 797 | options.log_level = SYSLOG_LEVEL_QUIET; |
| 798 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 799 | case 'e': |
| 800 | if (optarg[0] == '^' && optarg[2] == 0 && |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 801 | (u_char) optarg[1] >= 64 && |
| 802 | (u_char) optarg[1] < 128) |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 803 | options.escape_char = (u_char) optarg[1] & 31; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 804 | else if (strlen(optarg) == 1) |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 805 | options.escape_char = (u_char) optarg[0]; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 806 | else if (strcmp(optarg, "none") == 0) |
Ben Lindstrom | 2b1f71b | 2001-06-05 20:32:21 +0000 | [diff] [blame] | 807 | options.escape_char = SSH_ESCAPECHAR_NONE; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 808 | else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 809 | fprintf(stderr, "Bad escape character '%s'.\n", |
| 810 | optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 811 | exit(255); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 812 | } |
| 813 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 814 | case 'c': |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 815 | if (!ciphers_valid(*optarg == '+' ? |
djm@openbsd.org | f9eca24 | 2015-07-30 00:01:34 +0000 | [diff] [blame] | 816 | optarg + 1 : optarg)) { |
djm@openbsd.org | f9eca24 | 2015-07-30 00:01:34 +0000 | [diff] [blame] | 817 | fprintf(stderr, "Unknown cipher type '%s'\n", |
| 818 | optarg); |
| 819 | exit(255); |
| 820 | } |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 821 | free(options.ciphers); |
| 822 | options.ciphers = xstrdup(optarg); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 823 | break; |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 824 | case 'm': |
dtucker@openbsd.org | 4f7cc2f | 2015-09-04 08:21:47 +0000 | [diff] [blame] | 825 | if (mac_valid(optarg)) { |
| 826 | free(options.macs); |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 827 | options.macs = xstrdup(optarg); |
dtucker@openbsd.org | 4f7cc2f | 2015-09-04 08:21:47 +0000 | [diff] [blame] | 828 | } else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 829 | fprintf(stderr, "Unknown mac type '%s'\n", |
| 830 | optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 831 | exit(255); |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 832 | } |
| 833 | break; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 834 | case 'M': |
Damien Miller | d14b1e7 | 2005-06-16 13:19:41 +1000 | [diff] [blame] | 835 | if (options.control_master == SSHCTL_MASTER_YES) |
| 836 | options.control_master = SSHCTL_MASTER_ASK; |
| 837 | else |
| 838 | options.control_master = SSHCTL_MASTER_YES; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 839 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 840 | case 'p': |
Ben Lindstrom | 19066a1 | 2001-04-12 23:39:26 +0000 | [diff] [blame] | 841 | options.port = a2port(optarg); |
Damien Miller | 3dc71ad | 2009-01-28 16:31:22 +1100 | [diff] [blame] | 842 | if (options.port <= 0) { |
Ben Lindstrom | 146edb9 | 2001-04-11 23:06:28 +0000 | [diff] [blame] | 843 | fprintf(stderr, "Bad port '%s'\n", optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 844 | exit(255); |
Ben Lindstrom | 146edb9 | 2001-04-11 23:06:28 +0000 | [diff] [blame] | 845 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 846 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 847 | case 'l': |
| 848 | options.user = optarg; |
| 849 | break; |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 850 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 851 | case 'L': |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 852 | if (parse_forward(&fwd, optarg, 0, 0)) |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 853 | add_local_forward(&options, &fwd); |
| 854 | else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 855 | fprintf(stderr, |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 856 | "Bad local forwarding specification '%s'\n", |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 857 | optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 858 | exit(255); |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 859 | } |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 860 | break; |
| 861 | |
| 862 | case 'R': |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 863 | if (parse_forward(&fwd, optarg, 0, 1)) { |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 864 | add_remote_forward(&options, &fwd); |
| 865 | } else { |
| 866 | fprintf(stderr, |
| 867 | "Bad remote forwarding specification " |
| 868 | "'%s'\n", optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 869 | exit(255); |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 870 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 871 | break; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 872 | |
| 873 | case 'D': |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 874 | if (parse_forward(&fwd, optarg, 1, 0)) { |
Damien Miller | a699d95 | 2008-11-03 19:27:34 +1100 | [diff] [blame] | 875 | add_local_forward(&options, &fwd); |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 876 | } else { |
Damien Miller | a699d95 | 2008-11-03 19:27:34 +1100 | [diff] [blame] | 877 | fprintf(stderr, |
| 878 | "Bad dynamic forwarding specification " |
| 879 | "'%s'\n", optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 880 | exit(255); |
Ben Lindstrom | 146edb9 | 2001-04-11 23:06:28 +0000 | [diff] [blame] | 881 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 882 | break; |
| 883 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 884 | case 'C': |
| 885 | options.compression = 1; |
| 886 | break; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 887 | case 'N': |
| 888 | no_shell_flag = 1; |
Damien Miller | 21771e2 | 2011-05-15 08:45:50 +1000 | [diff] [blame] | 889 | options.request_tty = REQUEST_TTY_NO; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 890 | break; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 891 | case 'T': |
Damien Miller | 21771e2 | 2011-05-15 08:45:50 +1000 | [diff] [blame] | 892 | options.request_tty = REQUEST_TTY_NO; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 893 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 894 | case 'o': |
Damien Miller | 9836cf8 | 2003-12-17 16:30:06 +1100 | [diff] [blame] | 895 | line = xstrdup(optarg); |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 896 | if (process_config_line(&options, pw, |
| 897 | host ? host : "", host ? host : "", line, |
| 898 | "command-line", 0, NULL, SSHCONF_USERCONF) != 0) |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 899 | exit(255); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 900 | free(line); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 901 | break; |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 902 | case 's': |
| 903 | subsystem_flag = 1; |
| 904 | break; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 905 | case 'S': |
mmcc@openbsd.org | d59ce08 | 2015-12-10 17:08:40 +0000 | [diff] [blame] | 906 | free(options.control_path); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 907 | options.control_path = xstrdup(optarg); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 908 | break; |
Ben Lindstrom | e0f8804 | 2001-04-30 13:06:24 +0000 | [diff] [blame] | 909 | case 'b': |
| 910 | options.bind_address = optarg; |
| 911 | break; |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 912 | case 'F': |
| 913 | config = optarg; |
| 914 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 915 | default: |
| 916 | usage(); |
| 917 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 918 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 919 | |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 920 | ac -= optind; |
| 921 | av += optind; |
| 922 | |
Darren Tucker | b8c884a | 2010-01-08 18:53:43 +1100 | [diff] [blame] | 923 | if (ac > 0 && !host) { |
Ben Lindstrom | c276c12 | 2002-12-23 02:14:51 +0000 | [diff] [blame] | 924 | if (strrchr(*av, '@')) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 925 | p = xstrdup(*av); |
Ben Lindstrom | c276c12 | 2002-12-23 02:14:51 +0000 | [diff] [blame] | 926 | cp = strrchr(p, '@'); |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 927 | if (cp == NULL || cp == p) |
| 928 | usage(); |
| 929 | options.user = p; |
| 930 | *cp = '\0'; |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 931 | host = xstrdup(++cp); |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 932 | } else |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 933 | host = xstrdup(*av); |
Ben Lindstrom | b9fa691 | 2002-12-23 02:24:54 +0000 | [diff] [blame] | 934 | if (ac > 1) { |
| 935 | optind = optreset = 1; |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 936 | goto again; |
| 937 | } |
Ben Lindstrom | b9fa691 | 2002-12-23 02:24:54 +0000 | [diff] [blame] | 938 | ac--, av++; |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 939 | } |
| 940 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 941 | /* Check that we got a host name. */ |
| 942 | if (!host) |
| 943 | usage(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 944 | |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 945 | host_arg = xstrdup(host); |
| 946 | |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 947 | #ifdef WITH_OPENSSL |
Damien Miller | 4314c2b | 2010-09-10 11:12:09 +1000 | [diff] [blame] | 948 | OpenSSL_add_all_algorithms(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 949 | ERR_load_crypto_strings(); |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 950 | #endif |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 951 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 952 | /* Initialize the command to execute on remote host. */ |
| 953 | buffer_init(&command); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 954 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 955 | /* |
| 956 | * Save the command to execute on the remote host in a buffer. There |
| 957 | * is no limit on the length of the command, except by the maximum |
| 958 | * packet size. Also sets the tty flag if there is no command. |
| 959 | */ |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 960 | if (!ac) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 961 | /* No command specified - execute shell on a tty. */ |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 962 | if (subsystem_flag) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 963 | fprintf(stderr, |
| 964 | "You must specify a subsystem to invoke.\n"); |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 965 | usage(); |
| 966 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 967 | } else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 968 | /* A command has been specified. Store it into the buffer. */ |
| 969 | for (i = 0; i < ac; i++) { |
| 970 | if (i) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 971 | buffer_append(&command, " ", 1); |
| 972 | buffer_append(&command, av[i], strlen(av[i])); |
| 973 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 974 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 975 | |
Ben Lindstrom | 8a432f5 | 2001-03-05 07:24:46 +0000 | [diff] [blame] | 976 | /* |
| 977 | * Initialize "log" output. Since we are the client all output |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 978 | * goes to stderr unless otherwise specified by -y or -E. |
Ben Lindstrom | 8a432f5 | 2001-03-05 07:24:46 +0000 | [diff] [blame] | 979 | */ |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 980 | if (use_syslog && logfile != NULL) |
| 981 | fatal("Can't specify both -y and -E"); |
dtucker@openbsd.org | 4f7cc2f | 2015-09-04 08:21:47 +0000 | [diff] [blame] | 982 | if (logfile != NULL) |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 983 | log_redirect_stderr_to(logfile); |
Darren Tucker | 72efd74 | 2009-06-21 17:48:00 +1000 | [diff] [blame] | 984 | log_init(argv0, |
dtucker@openbsd.org | 68d3a2a | 2017-04-28 03:20:27 +0000 | [diff] [blame] | 985 | options.log_level == SYSLOG_LEVEL_NOT_SET ? |
| 986 | SYSLOG_LEVEL_INFO : options.log_level, |
| 987 | options.log_facility == SYSLOG_FACILITY_NOT_SET ? |
| 988 | SYSLOG_FACILITY_USER : options.log_facility, |
| 989 | !use_syslog); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 990 | |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 991 | if (debug_flag) |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 992 | logit("%s, %s", SSH_RELEASE, |
| 993 | #ifdef WITH_OPENSSL |
| 994 | SSLeay_version(SSLEAY_VERSION) |
| 995 | #else |
| 996 | "without OpenSSL" |
| 997 | #endif |
| 998 | ); |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 999 | |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 1000 | /* Parse the configuration files */ |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 1001 | process_config_files(host_arg, pw, 0); |
Ben Lindstrom | 83f07d1 | 2001-10-03 17:22:29 +0000 | [diff] [blame] | 1002 | |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 1003 | /* Hostname canonicalisation needs a few options filled. */ |
| 1004 | fill_default_options_for_canonicalization(&options); |
| 1005 | |
| 1006 | /* If the user has replaced the hostname then take it into use now */ |
| 1007 | if (options.hostname != NULL) { |
| 1008 | /* NB. Please keep in sync with readconf.c:match_cfg_line() */ |
| 1009 | cp = percent_expand(options.hostname, |
| 1010 | "h", host, (char *)NULL); |
| 1011 | free(host); |
| 1012 | host = cp; |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 1013 | free(options.hostname); |
| 1014 | options.hostname = xstrdup(host); |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 1015 | } |
| 1016 | |
| 1017 | /* If canonicalization requested then try to apply it */ |
| 1018 | lowercase(host); |
| 1019 | if (options.canonicalize_hostname != SSH_CANONICALISE_NO) |
| 1020 | addrs = resolve_canonicalize(&host, options.port); |
| 1021 | |
| 1022 | /* |
Damien Miller | 08b57c6 | 2014-02-27 10:17:13 +1100 | [diff] [blame] | 1023 | * If CanonicalizePermittedCNAMEs have been specified but |
| 1024 | * other canonicalization did not happen (by not being requested |
| 1025 | * or by failing with fallback) then the hostname may still be changed |
| 1026 | * as a result of CNAME following. |
| 1027 | * |
| 1028 | * Try to resolve the bare hostname name using the system resolver's |
| 1029 | * usual search rules and then apply the CNAME follow rules. |
| 1030 | * |
| 1031 | * Skip the lookup if a ProxyCommand is being used unless the user |
| 1032 | * has specifically requested canonicalisation for this case via |
| 1033 | * CanonicalizeHostname=always |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 1034 | */ |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 1035 | direct = option_clear_or_none(options.proxy_command) && |
| 1036 | options.jump_host == NULL; |
| 1037 | if (addrs == NULL && options.num_permitted_cnames != 0 && (direct || |
| 1038 | options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) { |
Damien Miller | 19439e9 | 2014-07-02 15:28:40 +1000 | [diff] [blame] | 1039 | if ((addrs = resolve_host(host, options.port, |
| 1040 | option_clear_or_none(options.proxy_command), |
| 1041 | cname, sizeof(cname))) == NULL) { |
| 1042 | /* Don't fatal proxied host names not in the DNS */ |
| 1043 | if (option_clear_or_none(options.proxy_command)) |
| 1044 | cleanup_exit(255); /* logged in resolve_host */ |
| 1045 | } else |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 1046 | check_follow_cname(direct, &host, cname); |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 1047 | } |
| 1048 | |
| 1049 | /* |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 1050 | * If canonicalisation is enabled then re-parse the configuration |
| 1051 | * files as new stanzas may match. |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 1052 | */ |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 1053 | if (options.canonicalize_hostname != 0) { |
| 1054 | debug("Re-reading configuration after hostname " |
| 1055 | "canonicalisation"); |
| 1056 | free(options.hostname); |
| 1057 | options.hostname = xstrdup(host); |
| 1058 | process_config_files(host_arg, pw, 1); |
| 1059 | /* |
| 1060 | * Address resolution happens early with canonicalisation |
| 1061 | * enabled and the port number may have changed since, so |
| 1062 | * reset it in address list |
| 1063 | */ |
| 1064 | if (addrs != NULL && options.port > 0) |
| 1065 | set_addrinfo_port(addrs, options.port); |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 1066 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1067 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1068 | /* Fill configuration defaults. */ |
| 1069 | fill_default_options(&options); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1070 | |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 1071 | /* |
| 1072 | * If ProxyJump option specified, then construct a ProxyCommand now. |
| 1073 | */ |
| 1074 | if (options.jump_host != NULL) { |
| 1075 | char port_s[8]; |
| 1076 | |
| 1077 | /* Consistency check */ |
| 1078 | if (options.proxy_command != NULL) |
| 1079 | fatal("inconsistent options: ProxyCommand+ProxyJump"); |
| 1080 | /* Never use FD passing for ProxyJump */ |
| 1081 | options.proxy_use_fdpass = 0; |
| 1082 | snprintf(port_s, sizeof(port_s), "%d", options.jump_port); |
| 1083 | xasprintf(&options.proxy_command, |
djm@openbsd.org | 8fb1531 | 2017-03-08 12:07:47 +0000 | [diff] [blame] | 1084 | "ssh%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s", |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 1085 | /* Optional "-l user" argument if jump_user set */ |
| 1086 | options.jump_user == NULL ? "" : " -l ", |
| 1087 | options.jump_user == NULL ? "" : options.jump_user, |
| 1088 | /* Optional "-p port" argument if jump_port set */ |
| 1089 | options.jump_port <= 0 ? "" : " -p ", |
| 1090 | options.jump_port <= 0 ? "" : port_s, |
| 1091 | /* Optional additional jump hosts ",..." */ |
| 1092 | options.jump_extra == NULL ? "" : " -J ", |
| 1093 | options.jump_extra == NULL ? "" : options.jump_extra, |
| 1094 | /* Optional "-F" argumment if -F specified */ |
| 1095 | config == NULL ? "" : " -F ", |
| 1096 | config == NULL ? "" : config, |
| 1097 | /* Optional "-v" arguments if -v set */ |
| 1098 | debug_flag ? " -" : "", |
| 1099 | debug_flag, "vvv", |
| 1100 | /* Mandatory hostname */ |
| 1101 | options.jump_host); |
| 1102 | debug("Setting implicit ProxyCommand from ProxyJump: %s", |
| 1103 | options.proxy_command); |
| 1104 | } |
| 1105 | |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 1106 | if (options.port == 0) |
| 1107 | options.port = default_ssh_port(); |
Darren Tucker | 0a4f04b | 2003-07-03 20:37:47 +1000 | [diff] [blame] | 1108 | channel_set_af(options.address_family); |
| 1109 | |
Damien Miller | e9fc72e | 2013-10-15 12:14:12 +1100 | [diff] [blame] | 1110 | /* Tidy and check options */ |
| 1111 | if (options.host_key_alias != NULL) |
| 1112 | lowercase(options.host_key_alias); |
| 1113 | if (options.proxy_command != NULL && |
| 1114 | strcmp(options.proxy_command, "-") == 0 && |
| 1115 | options.proxy_use_fdpass) |
| 1116 | fatal("ProxyCommand=- and ProxyUseFDPass are incompatible"); |
djm@openbsd.org | 44732de | 2015-02-20 22:17:21 +0000 | [diff] [blame] | 1117 | if (options.control_persist && |
| 1118 | options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) { |
| 1119 | debug("UpdateHostKeys=ask is incompatible with ControlPersist; " |
| 1120 | "disabling"); |
| 1121 | options.update_hostkeys = 0; |
| 1122 | } |
djm@openbsd.org | 88b6fcd | 2015-11-19 08:23:27 +0000 | [diff] [blame] | 1123 | if (options.connection_attempts <= 0) |
| 1124 | fatal("Invalid number of ConnectionAttempts"); |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 1125 | #ifndef HAVE_CYGWIN |
| 1126 | if (original_effective_uid != 0) |
| 1127 | options.use_privileged_port = 0; |
| 1128 | #endif |
Damien Miller | e9fc72e | 2013-10-15 12:14:12 +1100 | [diff] [blame] | 1129 | |
bluhm@openbsd.org | 1112b53 | 2017-05-30 18:58:37 +0000 | [diff] [blame^] | 1130 | if (buffer_len(&command) != 0 && options.remote_command != NULL) |
| 1131 | fatal("Cannot execute command-line and remote command."); |
| 1132 | |
| 1133 | /* Cannot fork to background if no command. */ |
| 1134 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && |
| 1135 | options.remote_command == NULL && !no_shell_flag) |
| 1136 | fatal("Cannot fork into background without a command " |
| 1137 | "to execute."); |
| 1138 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1139 | /* reinit */ |
dtucker@openbsd.org | 68d3a2a | 2017-04-28 03:20:27 +0000 | [diff] [blame] | 1140 | log_init(argv0, options.log_level, options.log_facility, !use_syslog); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1141 | |
Damien Miller | fff9f09 | 2012-07-06 13:45:01 +1000 | [diff] [blame] | 1142 | if (options.request_tty == REQUEST_TTY_YES || |
| 1143 | options.request_tty == REQUEST_TTY_FORCE) |
| 1144 | tty_flag = 1; |
| 1145 | |
| 1146 | /* Allocate a tty by default if no command specified. */ |
bluhm@openbsd.org | 1112b53 | 2017-05-30 18:58:37 +0000 | [diff] [blame^] | 1147 | if (buffer_len(&command) == 0 && options.remote_command == NULL) |
Damien Miller | fff9f09 | 2012-07-06 13:45:01 +1000 | [diff] [blame] | 1148 | tty_flag = options.request_tty != REQUEST_TTY_NO; |
| 1149 | |
| 1150 | /* Force no tty */ |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 1151 | if (options.request_tty == REQUEST_TTY_NO || |
| 1152 | (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY)) |
Damien Miller | fff9f09 | 2012-07-06 13:45:01 +1000 | [diff] [blame] | 1153 | tty_flag = 0; |
| 1154 | /* Do not allocate a tty if stdin is not a tty. */ |
| 1155 | if ((!isatty(fileno(stdin)) || stdin_null_flag) && |
| 1156 | options.request_tty != REQUEST_TTY_FORCE) { |
| 1157 | if (tty_flag) |
| 1158 | logit("Pseudo-terminal will not be allocated because " |
| 1159 | "stdin is not a terminal."); |
| 1160 | tty_flag = 0; |
| 1161 | } |
| 1162 | |
Damien Miller | 60bc517 | 2001-03-19 09:38:15 +1100 | [diff] [blame] | 1163 | seed_rng(); |
| 1164 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1165 | if (options.user == NULL) |
| 1166 | options.user = xstrdup(pw->pw_name); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1167 | |
Damien Miller | dfc85fa | 2011-05-15 08:44:02 +1000 | [diff] [blame] | 1168 | if (gethostname(thishost, sizeof(thishost)) == -1) |
| 1169 | fatal("gethostname: %s", strerror(errno)); |
| 1170 | strlcpy(shorthost, thishost, sizeof(shorthost)); |
| 1171 | shorthost[strcspn(thishost, ".")] = '\0'; |
| 1172 | snprintf(portstr, sizeof(portstr), "%d", options.port); |
djm@openbsd.org | 674b3b6 | 2015-09-11 03:47:28 +0000 | [diff] [blame] | 1173 | snprintf(uidstr, sizeof(uidstr), "%d", pw->pw_uid); |
Darren Tucker | f6b01b7 | 2008-06-13 04:56:37 +1000 | [diff] [blame] | 1174 | |
Damien Miller | 9c38643 | 2014-07-03 21:27:46 +1000 | [diff] [blame] | 1175 | if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL || |
| 1176 | ssh_digest_update(md, thishost, strlen(thishost)) < 0 || |
| 1177 | ssh_digest_update(md, host, strlen(host)) < 0 || |
| 1178 | ssh_digest_update(md, portstr, strlen(portstr)) < 0 || |
| 1179 | ssh_digest_update(md, options.user, strlen(options.user)) < 0 || |
| 1180 | ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0) |
| 1181 | fatal("%s: mux digest failed", __func__); |
| 1182 | ssh_digest_free(md); |
| 1183 | conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1)); |
| 1184 | |
Damien Miller | dfc85fa | 2011-05-15 08:44:02 +1000 | [diff] [blame] | 1185 | if (options.local_command != NULL) { |
Darren Tucker | f6b01b7 | 2008-06-13 04:56:37 +1000 | [diff] [blame] | 1186 | debug3("expanding LocalCommand: %s", options.local_command); |
| 1187 | cp = options.local_command; |
Damien Miller | 9c38643 | 2014-07-03 21:27:46 +1000 | [diff] [blame] | 1188 | options.local_command = percent_expand(cp, |
| 1189 | "C", conn_hash_hex, |
| 1190 | "L", shorthost, |
| 1191 | "d", pw->pw_dir, |
| 1192 | "h", host, |
| 1193 | "l", thishost, |
| 1194 | "n", host_arg, |
| 1195 | "p", portstr, |
| 1196 | "r", options.user, |
| 1197 | "u", pw->pw_name, |
Damien Miller | dfc85fa | 2011-05-15 08:44:02 +1000 | [diff] [blame] | 1198 | (char *)NULL); |
Darren Tucker | f6b01b7 | 2008-06-13 04:56:37 +1000 | [diff] [blame] | 1199 | debug3("expanded LocalCommand: %s", options.local_command); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1200 | free(cp); |
Darren Tucker | f6b01b7 | 2008-06-13 04:56:37 +1000 | [diff] [blame] | 1201 | } |
| 1202 | |
bluhm@openbsd.org | 1112b53 | 2017-05-30 18:58:37 +0000 | [diff] [blame^] | 1203 | if (options.remote_command != NULL) { |
| 1204 | debug3("expanding RemoteCommand: %s", options.remote_command); |
| 1205 | cp = options.remote_command; |
| 1206 | options.remote_command = percent_expand(cp, |
| 1207 | "C", conn_hash_hex, |
| 1208 | "L", shorthost, |
| 1209 | "d", pw->pw_dir, |
| 1210 | "h", host, |
| 1211 | "l", thishost, |
| 1212 | "n", host_arg, |
| 1213 | "p", portstr, |
| 1214 | "r", options.user, |
| 1215 | "u", pw->pw_name, |
| 1216 | (char *)NULL); |
| 1217 | debug3("expanded RemoteCommand: %s", options.remote_command); |
| 1218 | free(cp); |
| 1219 | buffer_append(&command, options.remote_command, |
| 1220 | strlen(options.remote_command)); |
| 1221 | |
| 1222 | } |
| 1223 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1224 | if (options.control_path != NULL) { |
Damien Miller | 6476cad | 2005-06-16 13:18:34 +1000 | [diff] [blame] | 1225 | cp = tilde_expand_filename(options.control_path, |
| 1226 | original_real_uid); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1227 | free(options.control_path); |
Damien Miller | 9c38643 | 2014-07-03 21:27:46 +1000 | [diff] [blame] | 1228 | options.control_path = percent_expand(cp, |
| 1229 | "C", conn_hash_hex, |
| 1230 | "L", shorthost, |
| 1231 | "h", host, |
| 1232 | "l", thishost, |
| 1233 | "n", host_arg, |
| 1234 | "p", portstr, |
| 1235 | "r", options.user, |
| 1236 | "u", pw->pw_name, |
djm@openbsd.org | 674b3b6 | 2015-09-11 03:47:28 +0000 | [diff] [blame] | 1237 | "i", uidstr, |
Damien Miller | dfc85fa | 2011-05-15 08:44:02 +1000 | [diff] [blame] | 1238 | (char *)NULL); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1239 | free(cp); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1240 | } |
Damien Miller | 9c38643 | 2014-07-03 21:27:46 +1000 | [diff] [blame] | 1241 | free(conn_hash_hex); |
| 1242 | |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 1243 | if (config_test) { |
| 1244 | dump_client_config(&options, host); |
| 1245 | exit(0); |
| 1246 | } |
| 1247 | |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 1248 | if (muxclient_command != 0 && options.control_path == NULL) |
Darren Tucker | 0814d31 | 2005-06-01 23:08:51 +1000 | [diff] [blame] | 1249 | fatal("No ControlPath specified for \"-O\" command"); |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 1250 | if (options.control_path != NULL) { |
| 1251 | int sock; |
| 1252 | if ((sock = muxclient(options.control_path)) >= 0) { |
| 1253 | packet_set_connection(sock, sock); |
| 1254 | ssh = active_state; /* XXX */ |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 1255 | packet_set_mux(); |
| 1256 | goto skip_connect; |
| 1257 | } |
| 1258 | } |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1259 | |
Damien Miller | 08b57c6 | 2014-02-27 10:17:13 +1100 | [diff] [blame] | 1260 | /* |
| 1261 | * If hostname canonicalisation was not enabled, then we may not |
| 1262 | * have yet resolved the hostname. Do so now. |
| 1263 | */ |
| 1264 | if (addrs == NULL && options.proxy_command == NULL) { |
djm@openbsd.org | a85768a | 2015-09-04 04:56:09 +0000 | [diff] [blame] | 1265 | debug2("resolving \"%s\" port %d", host, options.port); |
Damien Miller | 08b57c6 | 2014-02-27 10:17:13 +1100 | [diff] [blame] | 1266 | if ((addrs = resolve_host(host, options.port, 1, |
| 1267 | cname, sizeof(cname))) == NULL) |
| 1268 | cleanup_exit(255); /* resolve_host logs the error */ |
| 1269 | } |
| 1270 | |
Damien Miller | 67bd062 | 2007-09-17 12:06:57 +1000 | [diff] [blame] | 1271 | timeout_ms = options.connection_timeout * 1000; |
| 1272 | |
Kevin Steves | fcec7f8 | 2000-12-15 19:55:48 +0000 | [diff] [blame] | 1273 | /* Open a connection to the remote host. */ |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 1274 | if (ssh_connect(host, addrs, &hostaddr, options.port, |
| 1275 | options.address_family, options.connection_attempts, |
| 1276 | &timeout_ms, options.tcp_keep_alive, |
| 1277 | options.use_privileged_port) != 0) |
| 1278 | exit(255); |
| 1279 | |
Damien Miller | 28631ce | 2013-10-26 10:07:56 +1100 | [diff] [blame] | 1280 | if (addrs != NULL) |
| 1281 | freeaddrinfo(addrs); |
| 1282 | |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 1283 | packet_set_timeout(options.server_alive_interval, |
| 1284 | options.server_alive_count_max); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1285 | |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1286 | ssh = active_state; /* XXX */ |
| 1287 | |
Damien Miller | 67bd062 | 2007-09-17 12:06:57 +1000 | [diff] [blame] | 1288 | if (timeout_ms > 0) |
| 1289 | debug3("timeout: %d ms remain after connect", timeout_ms); |
| 1290 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1291 | /* |
| 1292 | * If we successfully made the connection, load the host private key |
| 1293 | * in case we will need it later for combined rsa-rhosts |
| 1294 | * authentication. This must be done before releasing extra |
| 1295 | * privileges, because the file is only readable by root. |
Ben Lindstrom | 9e5bb57 | 2002-06-06 19:58:27 +0000 | [diff] [blame] | 1296 | * If we cannot access the private keys, load the public keys |
| 1297 | * instead and try to execute the ssh-keysign helper instead. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1298 | */ |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1299 | sensitive_data.nkeys = 0; |
| 1300 | sensitive_data.keys = NULL; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1301 | sensitive_data.external_keysign = 0; |
djm@openbsd.org | 873d3e7 | 2017-04-30 23:18:44 +0000 | [diff] [blame] | 1302 | if (options.hostbased_authentication) { |
Damien Miller | 0fa47cf | 2013-12-29 17:53:39 +1100 | [diff] [blame] | 1303 | sensitive_data.nkeys = 9; |
Damien Miller | ddd63ab | 2006-03-31 23:10:51 +1100 | [diff] [blame] | 1304 | sensitive_data.keys = xcalloc(sensitive_data.nkeys, |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 1305 | sizeof(struct sshkey)); /* XXX */ |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1306 | for (i = 0; i < sensitive_data.nkeys; i++) |
| 1307 | sensitive_data.keys[i] = NULL; |
Ben Lindstrom | f9c4884 | 2002-06-11 16:37:51 +0000 | [diff] [blame] | 1308 | |
| 1309 | PRIV_START; |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1310 | #ifdef OPENSSL_HAS_ECC |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1311 | sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA, |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 1312 | _PATH_HOST_ECDSA_KEY_FILE, "", NULL); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1313 | #endif |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1314 | sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519, |
| 1315 | _PATH_HOST_ED25519_KEY_FILE, "", NULL); |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 1316 | sensitive_data.keys[3] = key_load_private_cert(KEY_RSA, |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 1317 | _PATH_HOST_RSA_KEY_FILE, "", NULL); |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1318 | sensitive_data.keys[4] = key_load_private_cert(KEY_DSA, |
| 1319 | _PATH_HOST_DSA_KEY_FILE, "", NULL); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1320 | #ifdef OPENSSL_HAS_ECC |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1321 | sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA, |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 1322 | _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1323 | #endif |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1324 | sensitive_data.keys[6] = key_load_private_type(KEY_ED25519, |
| 1325 | _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL); |
Damien Miller | 0fa47cf | 2013-12-29 17:53:39 +1100 | [diff] [blame] | 1326 | sensitive_data.keys[7] = key_load_private_type(KEY_RSA, |
Darren Tucker | 232b76f | 2006-05-06 17:41:51 +1000 | [diff] [blame] | 1327 | _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL); |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1328 | sensitive_data.keys[8] = key_load_private_type(KEY_DSA, |
| 1329 | _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL); |
Ben Lindstrom | f9c4884 | 2002-06-11 16:37:51 +0000 | [diff] [blame] | 1330 | PRIV_END; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1331 | |
Ben Lindstrom | 5d35a2f | 2002-07-04 00:19:40 +0000 | [diff] [blame] | 1332 | if (options.hostbased_authentication == 1 && |
| 1333 | sensitive_data.keys[0] == NULL && |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 1334 | sensitive_data.keys[5] == NULL && |
Damien Miller | 5be9d9e | 2013-12-07 11:24:01 +1100 | [diff] [blame] | 1335 | sensitive_data.keys[6] == NULL && |
Damien Miller | 0fa47cf | 2013-12-29 17:53:39 +1100 | [diff] [blame] | 1336 | sensitive_data.keys[7] == NULL && |
| 1337 | sensitive_data.keys[8] == NULL) { |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1338 | #ifdef OPENSSL_HAS_ECC |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1339 | sensitive_data.keys[1] = key_load_cert( |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 1340 | _PATH_HOST_ECDSA_KEY_FILE); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1341 | #endif |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1342 | sensitive_data.keys[2] = key_load_cert( |
| 1343 | _PATH_HOST_ED25519_KEY_FILE); |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 1344 | sensitive_data.keys[3] = key_load_cert( |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 1345 | _PATH_HOST_RSA_KEY_FILE); |
Damien Miller | 0fa47cf | 2013-12-29 17:53:39 +1100 | [diff] [blame] | 1346 | sensitive_data.keys[4] = key_load_cert( |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1347 | _PATH_HOST_DSA_KEY_FILE); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1348 | #ifdef OPENSSL_HAS_ECC |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1349 | sensitive_data.keys[5] = key_load_public( |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 1350 | _PATH_HOST_ECDSA_KEY_FILE, NULL); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1351 | #endif |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1352 | sensitive_data.keys[6] = key_load_public( |
| 1353 | _PATH_HOST_ED25519_KEY_FILE, NULL); |
Damien Miller | 5be9d9e | 2013-12-07 11:24:01 +1100 | [diff] [blame] | 1354 | sensitive_data.keys[7] = key_load_public( |
Damien Miller | 0fa47cf | 2013-12-29 17:53:39 +1100 | [diff] [blame] | 1355 | _PATH_HOST_RSA_KEY_FILE, NULL); |
| 1356 | sensitive_data.keys[8] = key_load_public( |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1357 | _PATH_HOST_DSA_KEY_FILE, NULL); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1358 | sensitive_data.external_keysign = 1; |
| 1359 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1360 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1361 | /* |
| 1362 | * Get rid of any extra privileges that we may have. We will no |
| 1363 | * longer need them. Also, extra privileges could make it very hard |
| 1364 | * to read identity files and other non-world-readable files from the |
| 1365 | * user's home directory if it happens to be on a NFS volume where |
| 1366 | * root is mapped to nobody. |
| 1367 | */ |
Darren Tucker | 25f60a7 | 2004-08-15 17:23:34 +1000 | [diff] [blame] | 1368 | if (original_effective_uid == 0) { |
| 1369 | PRIV_START; |
| 1370 | permanently_set_uid(pw); |
| 1371 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1372 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1373 | /* |
| 1374 | * Now that we are back to our own permissions, create ~/.ssh |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 1375 | * directory if it doesn't already exist. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1376 | */ |
Darren Tucker | 45c66d7 | 2011-11-04 10:50:40 +1100 | [diff] [blame] | 1377 | if (config == NULL) { |
| 1378 | r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir, |
| 1379 | strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
| 1380 | if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) { |
Darren Tucker | 8ccb739 | 2010-09-10 12:28:24 +1000 | [diff] [blame] | 1381 | #ifdef WITH_SELINUX |
Darren Tucker | 45c66d7 | 2011-11-04 10:50:40 +1100 | [diff] [blame] | 1382 | ssh_selinux_setfscreatecon(buf); |
Darren Tucker | 8ccb739 | 2010-09-10 12:28:24 +1000 | [diff] [blame] | 1383 | #endif |
Darren Tucker | 45c66d7 | 2011-11-04 10:50:40 +1100 | [diff] [blame] | 1384 | if (mkdir(buf, 0700) < 0) |
| 1385 | error("Could not create directory '%.200s'.", |
| 1386 | buf); |
Darren Tucker | 8ccb739 | 2010-09-10 12:28:24 +1000 | [diff] [blame] | 1387 | #ifdef WITH_SELINUX |
Darren Tucker | 45c66d7 | 2011-11-04 10:50:40 +1100 | [diff] [blame] | 1388 | ssh_selinux_setfscreatecon(NULL); |
Darren Tucker | 8ccb739 | 2010-09-10 12:28:24 +1000 | [diff] [blame] | 1389 | #endif |
Darren Tucker | 45c66d7 | 2011-11-04 10:50:40 +1100 | [diff] [blame] | 1390 | } |
Darren Tucker | 8ccb739 | 2010-09-10 12:28:24 +1000 | [diff] [blame] | 1391 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1392 | /* load options.identity_files */ |
| 1393 | load_public_identity_files(); |
| 1394 | |
markus@openbsd.org | b02ad1c | 2016-05-04 12:21:53 +0000 | [diff] [blame] | 1395 | /* optionally set the SSH_AUTHSOCKET_ENV_NAME varibale */ |
markus@openbsd.org | 1a75d14 | 2016-05-04 14:29:58 +0000 | [diff] [blame] | 1396 | if (options.identity_agent && |
| 1397 | strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) { |
markus@openbsd.org | b02ad1c | 2016-05-04 12:21:53 +0000 | [diff] [blame] | 1398 | if (strcmp(options.identity_agent, "none") == 0) { |
| 1399 | unsetenv(SSH_AUTHSOCKET_ENV_NAME); |
| 1400 | } else { |
| 1401 | p = tilde_expand_filename(options.identity_agent, |
| 1402 | original_real_uid); |
| 1403 | cp = percent_expand(p, "d", pw->pw_dir, |
| 1404 | "u", pw->pw_name, "l", thishost, "h", host, |
| 1405 | "r", options.user, (char *)NULL); |
| 1406 | setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1); |
| 1407 | free(cp); |
| 1408 | free(p); |
| 1409 | } |
| 1410 | } |
| 1411 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1412 | /* Expand ~ in known host file names. */ |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 1413 | tilde_expand_paths(options.system_hostfiles, |
| 1414 | options.num_system_hostfiles); |
| 1415 | tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1416 | |
Damien Miller | 07cd589 | 2001-11-12 10:52:03 +1100 | [diff] [blame] | 1417 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
Damien Miller | 857b02e | 2010-09-24 22:02:56 +1000 | [diff] [blame] | 1418 | signal(SIGCHLD, main_sigchld_handler); |
Damien Miller | 07cd589 | 2001-11-12 10:52:03 +1100 | [diff] [blame] | 1419 | |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1420 | /* Log into the remote system. Never returns if the login fails. */ |
Damien Miller | 67bd062 | 2007-09-17 12:06:57 +1000 | [diff] [blame] | 1421 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 1422 | options.port, pw, timeout_ms); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1423 | |
Damien Miller | 383ffe6 | 2010-06-26 10:02:03 +1000 | [diff] [blame] | 1424 | if (packet_connection_is_on_socket()) { |
| 1425 | verbose("Authenticated to %s ([%s]:%d).", host, |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1426 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh)); |
Damien Miller | 383ffe6 | 2010-06-26 10:02:03 +1000 | [diff] [blame] | 1427 | } else { |
| 1428 | verbose("Authenticated to %s (via proxy).", host); |
| 1429 | } |
| 1430 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1431 | /* We no longer need the private host keys. Clear them now. */ |
| 1432 | if (sensitive_data.nkeys != 0) { |
| 1433 | for (i = 0; i < sensitive_data.nkeys; i++) { |
| 1434 | if (sensitive_data.keys[i] != NULL) { |
| 1435 | /* Destroys contents safely */ |
| 1436 | debug3("clear hostkey %d", i); |
| 1437 | key_free(sensitive_data.keys[i]); |
| 1438 | sensitive_data.keys[i] = NULL; |
| 1439 | } |
| 1440 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1441 | free(sensitive_data.keys); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1442 | } |
Ben Lindstrom | a6c8a8d | 2001-08-06 21:42:00 +0000 | [diff] [blame] | 1443 | for (i = 0; i < options.num_identity_files; i++) { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1444 | free(options.identity_files[i]); |
| 1445 | options.identity_files[i] = NULL; |
Ben Lindstrom | a6c8a8d | 2001-08-06 21:42:00 +0000 | [diff] [blame] | 1446 | if (options.identity_keys[i]) { |
| 1447 | key_free(options.identity_keys[i]); |
| 1448 | options.identity_keys[i] = NULL; |
| 1449 | } |
| 1450 | } |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1451 | for (i = 0; i < options.num_certificate_files; i++) { |
| 1452 | free(options.certificate_files[i]); |
| 1453 | options.certificate_files[i] = NULL; |
| 1454 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1455 | |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 1456 | skip_connect: |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame] | 1457 | exit_status = ssh_session2(); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1458 | packet_close(); |
Damien Miller | 8c4e18a | 2002-09-19 12:05:02 +1000 | [diff] [blame] | 1459 | |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 1460 | if (options.control_path != NULL && muxserver_sock != -1) |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1461 | unlink(options.control_path); |
| 1462 | |
Damien Miller | a41ccca | 2010-10-07 22:07:32 +1100 | [diff] [blame] | 1463 | /* Kill ProxyCommand if it is running. */ |
| 1464 | ssh_kill_proxy_command(); |
Damien Miller | 8c4e18a | 2002-09-19 12:05:02 +1000 | [diff] [blame] | 1465 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1466 | return exit_status; |
| 1467 | } |
| 1468 | |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1469 | static void |
| 1470 | control_persist_detach(void) |
| 1471 | { |
| 1472 | pid_t pid; |
djm@openbsd.org | d2d6bf8 | 2016-04-29 08:07:53 +0000 | [diff] [blame] | 1473 | int devnull, keep_stderr; |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1474 | |
| 1475 | debug("%s: backgrounding master process", __func__); |
| 1476 | |
| 1477 | /* |
| 1478 | * master (current process) into the background, and make the |
| 1479 | * foreground process a client of the backgrounded master. |
| 1480 | */ |
| 1481 | switch ((pid = fork())) { |
| 1482 | case -1: |
| 1483 | fatal("%s: fork: %s", __func__, strerror(errno)); |
| 1484 | case 0: |
| 1485 | /* Child: master process continues mainloop */ |
| 1486 | break; |
| 1487 | default: |
| 1488 | /* Parent: set up mux slave to connect to backgrounded master */ |
| 1489 | debug2("%s: background process is %ld", __func__, (long)pid); |
| 1490 | stdin_null_flag = ostdin_null_flag; |
Damien Miller | 21771e2 | 2011-05-15 08:45:50 +1000 | [diff] [blame] | 1491 | options.request_tty = orequest_tty; |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1492 | tty_flag = otty_flag; |
| 1493 | close(muxserver_sock); |
| 1494 | muxserver_sock = -1; |
Damien Miller | 5929c52 | 2010-09-10 11:17:02 +1000 | [diff] [blame] | 1495 | options.control_master = SSHCTL_MASTER_NO; |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1496 | muxclient(options.control_path); |
| 1497 | /* muxclient() doesn't return on success. */ |
| 1498 | fatal("Failed to connect to new control master"); |
| 1499 | } |
Damien Miller | 00d9ae2 | 2010-08-17 01:59:31 +1000 | [diff] [blame] | 1500 | if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) { |
| 1501 | error("%s: open(\"/dev/null\"): %s", __func__, |
| 1502 | strerror(errno)); |
| 1503 | } else { |
djm@openbsd.org | d2d6bf8 | 2016-04-29 08:07:53 +0000 | [diff] [blame] | 1504 | keep_stderr = log_is_on_stderr() && debug_flag; |
Damien Miller | 00d9ae2 | 2010-08-17 01:59:31 +1000 | [diff] [blame] | 1505 | if (dup2(devnull, STDIN_FILENO) == -1 || |
djm@openbsd.org | d2d6bf8 | 2016-04-29 08:07:53 +0000 | [diff] [blame] | 1506 | dup2(devnull, STDOUT_FILENO) == -1 || |
| 1507 | (!keep_stderr && dup2(devnull, STDERR_FILENO) == -1)) |
Damien Miller | 00d9ae2 | 2010-08-17 01:59:31 +1000 | [diff] [blame] | 1508 | error("%s: dup2: %s", __func__, strerror(errno)); |
| 1509 | if (devnull > STDERR_FILENO) |
| 1510 | close(devnull); |
| 1511 | } |
Damien Miller | 98e27dc | 2013-07-25 11:55:52 +1000 | [diff] [blame] | 1512 | daemon(1, 1); |
Damien Miller | ea2c1a4 | 2011-06-03 12:10:22 +1000 | [diff] [blame] | 1513 | setproctitle("%s [mux]", options.control_path); |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1514 | } |
| 1515 | |
| 1516 | /* Do fork() after authentication. Used by "ssh -f" */ |
| 1517 | static void |
| 1518 | fork_postauth(void) |
| 1519 | { |
| 1520 | if (need_controlpersist_detach) |
| 1521 | control_persist_detach(); |
| 1522 | debug("forking to background"); |
| 1523 | fork_after_authentication_flag = 0; |
| 1524 | if (daemon(1, 1) < 0) |
| 1525 | fatal("daemon() failed: %.200s", strerror(errno)); |
| 1526 | } |
| 1527 | |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1528 | /* Callback for remote forward global requests */ |
| 1529 | static void |
| 1530 | ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt) |
| 1531 | { |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1532 | struct Forward *rfwd = (struct Forward *)ctxt; |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1533 | |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 1534 | /* XXX verbose() on failure? */ |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 1535 | debug("remote forward %s for: listen %s%s%d, connect %s:%d", |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1536 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1537 | rfwd->listen_path ? rfwd->listen_path : |
| 1538 | rfwd->listen_host ? rfwd->listen_host : "", |
| 1539 | (rfwd->listen_path || rfwd->listen_host) ? ":" : "", |
| 1540 | rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path : |
| 1541 | rfwd->connect_host, rfwd->connect_port); |
| 1542 | if (rfwd->listen_path == NULL && rfwd->listen_port == 0) { |
Darren Tucker | 68afb8c | 2011-10-02 18:59:03 +1100 | [diff] [blame] | 1543 | if (type == SSH2_MSG_REQUEST_SUCCESS) { |
| 1544 | rfwd->allocated_port = packet_get_int(); |
| 1545 | logit("Allocated port %u for remote forward to %s:%d", |
| 1546 | rfwd->allocated_port, |
| 1547 | rfwd->connect_host, rfwd->connect_port); |
| 1548 | channel_update_permitted_opens(rfwd->handle, |
| 1549 | rfwd->allocated_port); |
| 1550 | } else { |
| 1551 | channel_update_permitted_opens(rfwd->handle, -1); |
| 1552 | } |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 1553 | } |
| 1554 | |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1555 | if (type == SSH2_MSG_REQUEST_FAILURE) { |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1556 | if (options.exit_on_forward_failure) { |
| 1557 | if (rfwd->listen_path != NULL) |
| 1558 | fatal("Error: remote port forwarding failed " |
| 1559 | "for listen path %s", rfwd->listen_path); |
| 1560 | else |
| 1561 | fatal("Error: remote port forwarding failed " |
| 1562 | "for listen port %d", rfwd->listen_port); |
| 1563 | } else { |
| 1564 | if (rfwd->listen_path != NULL) |
| 1565 | logit("Warning: remote port forwarding failed " |
| 1566 | "for listen path %s", rfwd->listen_path); |
| 1567 | else |
| 1568 | logit("Warning: remote port forwarding failed " |
| 1569 | "for listen port %d", rfwd->listen_port); |
| 1570 | } |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1571 | } |
Darren Tucker | 9a2a609 | 2008-07-04 12:53:50 +1000 | [diff] [blame] | 1572 | if (++remote_forward_confirms_received == options.num_remote_forwards) { |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1573 | debug("All remote forwarding requests processed"); |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1574 | if (fork_after_authentication_flag) |
| 1575 | fork_postauth(); |
Darren Tucker | 9a2a609 | 2008-07-04 12:53:50 +1000 | [diff] [blame] | 1576 | } |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1577 | } |
| 1578 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1579 | static void |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1580 | client_cleanup_stdio_fwd(int id, void *arg) |
| 1581 | { |
| 1582 | debug("stdio forwarding: done"); |
| 1583 | cleanup_exit(0); |
| 1584 | } |
| 1585 | |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1586 | static void |
Damien Miller | 357610d | 2014-07-18 15:04:10 +1000 | [diff] [blame] | 1587 | ssh_stdio_confirm(int id, int success, void *arg) |
| 1588 | { |
| 1589 | if (!success) |
| 1590 | fatal("stdio forwarding failed"); |
| 1591 | } |
| 1592 | |
| 1593 | static void |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1594 | ssh_init_stdio_forwarding(void) |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1595 | { |
| 1596 | Channel *c; |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1597 | int in, out; |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1598 | |
dtucker@openbsd.org | 8543ff3 | 2016-06-03 03:14:41 +0000 | [diff] [blame] | 1599 | if (options.stdio_forward_host == NULL) |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1600 | return; |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1601 | |
dtucker@openbsd.org | 8543ff3 | 2016-06-03 03:14:41 +0000 | [diff] [blame] | 1602 | debug3("%s: %s:%d", __func__, options.stdio_forward_host, |
| 1603 | options.stdio_forward_port); |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1604 | |
| 1605 | if ((in = dup(STDIN_FILENO)) < 0 || |
| 1606 | (out = dup(STDOUT_FILENO)) < 0) |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1607 | fatal("channel_connect_stdio_fwd: dup() in/out failed"); |
dtucker@openbsd.org | 8543ff3 | 2016-06-03 03:14:41 +0000 | [diff] [blame] | 1608 | if ((c = channel_connect_stdio_fwd(options.stdio_forward_host, |
| 1609 | options.stdio_forward_port, in, out)) == NULL) |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1610 | fatal("%s: channel_connect_stdio_fwd failed", __func__); |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1611 | channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0); |
Damien Miller | 357610d | 2014-07-18 15:04:10 +1000 | [diff] [blame] | 1612 | channel_register_open_confirm(c->self, ssh_stdio_confirm, NULL); |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1613 | } |
| 1614 | |
| 1615 | static void |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1616 | ssh_init_forwarding(void) |
| 1617 | { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1618 | int success = 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1619 | int i; |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1620 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1621 | /* Initiate local TCP/IP port forwardings. */ |
| 1622 | for (i = 0; i < options.num_local_forwards; i++) { |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1623 | debug("Local connections to %.200s:%d forwarded to remote " |
| 1624 | "address %.200s:%d", |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1625 | (options.local_forwards[i].listen_path != NULL) ? |
| 1626 | options.local_forwards[i].listen_path : |
Darren Tucker | 47eede7 | 2005-03-14 23:08:12 +1100 | [diff] [blame] | 1627 | (options.local_forwards[i].listen_host == NULL) ? |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1628 | (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") : |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1629 | options.local_forwards[i].listen_host, |
| 1630 | options.local_forwards[i].listen_port, |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1631 | (options.local_forwards[i].connect_path != NULL) ? |
| 1632 | options.local_forwards[i].connect_path : |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1633 | options.local_forwards[i].connect_host, |
| 1634 | options.local_forwards[i].connect_port); |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 1635 | success += channel_setup_local_fwd_listener( |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1636 | &options.local_forwards[i], &options.fwd_opts); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1637 | } |
Darren Tucker | e7d4b19 | 2006-07-12 22:17:10 +1000 | [diff] [blame] | 1638 | if (i > 0 && success != i && options.exit_on_forward_failure) |
| 1639 | fatal("Could not request local forwarding."); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1640 | if (i > 0 && success == 0) |
| 1641 | error("Could not request local forwarding."); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1642 | |
| 1643 | /* Initiate remote TCP/IP port forwardings. */ |
| 1644 | for (i = 0; i < options.num_remote_forwards; i++) { |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1645 | debug("Remote connections from %.200s:%d forwarded to " |
| 1646 | "local address %.200s:%d", |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1647 | (options.remote_forwards[i].listen_path != NULL) ? |
| 1648 | options.remote_forwards[i].listen_path : |
Damien Miller | 46d38de | 2005-07-17 17:02:09 +1000 | [diff] [blame] | 1649 | (options.remote_forwards[i].listen_host == NULL) ? |
Damien Miller | aa3bb10 | 2005-11-05 15:12:59 +1100 | [diff] [blame] | 1650 | "LOCALHOST" : options.remote_forwards[i].listen_host, |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1651 | options.remote_forwards[i].listen_port, |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1652 | (options.remote_forwards[i].connect_path != NULL) ? |
| 1653 | options.remote_forwards[i].connect_path : |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1654 | options.remote_forwards[i].connect_host, |
| 1655 | options.remote_forwards[i].connect_port); |
Darren Tucker | 68afb8c | 2011-10-02 18:59:03 +1100 | [diff] [blame] | 1656 | options.remote_forwards[i].handle = |
| 1657 | channel_request_remote_forwarding( |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1658 | &options.remote_forwards[i]); |
Darren Tucker | 68afb8c | 2011-10-02 18:59:03 +1100 | [diff] [blame] | 1659 | if (options.remote_forwards[i].handle < 0) { |
Darren Tucker | e7d4b19 | 2006-07-12 22:17:10 +1000 | [diff] [blame] | 1660 | if (options.exit_on_forward_failure) |
| 1661 | fatal("Could not request remote forwarding."); |
| 1662 | else |
| 1663 | logit("Warning: Could not request remote " |
| 1664 | "forwarding."); |
Darren Tucker | 68afb8c | 2011-10-02 18:59:03 +1100 | [diff] [blame] | 1665 | } else { |
| 1666 | client_register_global_confirm(ssh_confirm_remote_forward, |
| 1667 | &options.remote_forwards[i]); |
Darren Tucker | e7d4b19 | 2006-07-12 22:17:10 +1000 | [diff] [blame] | 1668 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1669 | } |
Damien Miller | b3ce9fe | 2007-08-08 14:32:41 +1000 | [diff] [blame] | 1670 | |
| 1671 | /* Initiate tunnel forwarding. */ |
| 1672 | if (options.tun_open != SSH_TUNMODE_NO) { |
| 1673 | if (client_request_tun_fwd(options.tun_open, |
| 1674 | options.tun_local, options.tun_remote) == -1) { |
| 1675 | if (options.exit_on_forward_failure) |
| 1676 | fatal("Could not request tunnel forwarding."); |
| 1677 | else |
| 1678 | error("Could not request tunnel forwarding."); |
| 1679 | } |
| 1680 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1681 | } |
| 1682 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1683 | static void |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1684 | check_agent_present(void) |
| 1685 | { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1686 | int r; |
| 1687 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1688 | if (options.forward_agent) { |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 1689 | /* Clear agent forwarding if we don't have an agent. */ |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1690 | if ((r = ssh_get_authentication_socket(NULL)) != 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1691 | options.forward_agent = 0; |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1692 | if (r != SSH_ERR_AGENT_NOT_PRESENT) |
| 1693 | debug("ssh_get_authentication_socket: %s", |
| 1694 | ssh_err(r)); |
| 1695 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1696 | } |
| 1697 | } |
| 1698 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1699 | static void |
Damien Miller | d530f5f | 2010-05-21 14:57:10 +1000 | [diff] [blame] | 1700 | ssh_session2_setup(int id, int success, void *arg) |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1701 | { |
Damien Miller | 3756dce | 2004-06-18 01:17:29 +1000 | [diff] [blame] | 1702 | extern char **environ; |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1703 | const char *display; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1704 | int interactive = tty_flag; |
djm@openbsd.org | ed4ce82 | 2016-01-13 23:04:47 +0000 | [diff] [blame] | 1705 | char *proto = NULL, *data = NULL; |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1706 | |
Damien Miller | d530f5f | 2010-05-21 14:57:10 +1000 | [diff] [blame] | 1707 | if (!success) |
| 1708 | return; /* No need for error message, channels code sens one */ |
| 1709 | |
Damien Miller | 46d38de | 2005-07-17 17:02:09 +1000 | [diff] [blame] | 1710 | display = getenv("DISPLAY"); |
djm@openbsd.org | a58be33 | 2015-04-17 13:16:48 +0000 | [diff] [blame] | 1711 | if (display == NULL && options.forward_x11) |
| 1712 | debug("X11 forwarding requested but DISPLAY not set"); |
djm@openbsd.org | ed4ce82 | 2016-01-13 23:04:47 +0000 | [diff] [blame] | 1713 | if (options.forward_x11 && client_x11_get_proto(display, |
| 1714 | options.xauth_location, options.forward_x11_trusted, |
| 1715 | options.forward_x11_timeout, &proto, &data) == 0) { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1716 | /* Request forwarding with authentication spoofing. */ |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1717 | debug("Requesting X11 forwarding with authentication " |
| 1718 | "spoofing."); |
Damien Miller | 6d7b437 | 2011-06-23 08:31:57 +1000 | [diff] [blame] | 1719 | x11_request_forwarding_with_spoofing(id, display, proto, |
| 1720 | data, 1); |
| 1721 | client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN); |
| 1722 | /* XXX exit_on_forward_failure */ |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 1723 | interactive = 1; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1724 | } |
| 1725 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1726 | check_agent_present(); |
| 1727 | if (options.forward_agent) { |
| 1728 | debug("Requesting authentication agent forwarding."); |
| 1729 | channel_request_start(id, "auth-agent-req@openssh.com", 0); |
| 1730 | packet_send(); |
| 1731 | } |
| 1732 | |
Darren Tucker | 7b30501 | 2012-07-02 18:55:09 +1000 | [diff] [blame] | 1733 | /* Tell the packet module whether this is an interactive session. */ |
| 1734 | packet_set_interactive(interactive, |
| 1735 | options.ip_qos_interactive, options.ip_qos_bulk); |
| 1736 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1737 | client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), |
Damien Miller | 5771ed7 | 2008-05-19 15:35:33 +1000 | [diff] [blame] | 1738 | NULL, fileno(stdin), &command, environ); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1739 | } |
| 1740 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1741 | /* open new channel for a session */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1742 | static int |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1743 | ssh_session2_open(void) |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1744 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1745 | Channel *c; |
| 1746 | int window, packetmax, in, out, err; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1747 | |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 1748 | if (stdin_null_flag) { |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1749 | in = open(_PATH_DEVNULL, O_RDONLY); |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 1750 | } else { |
| 1751 | in = dup(STDIN_FILENO); |
| 1752 | } |
| 1753 | out = dup(STDOUT_FILENO); |
| 1754 | err = dup(STDERR_FILENO); |
| 1755 | |
| 1756 | if (in < 0 || out < 0 || err < 0) |
| 1757 | fatal("dup() in/out/err failed"); |
| 1758 | |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 1759 | /* enable nonblocking unless tty */ |
| 1760 | if (!isatty(in)) |
| 1761 | set_nonblock(in); |
| 1762 | if (!isatty(out)) |
| 1763 | set_nonblock(out); |
| 1764 | if (!isatty(err)) |
| 1765 | set_nonblock(err); |
| 1766 | |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1767 | window = CHAN_SES_WINDOW_DEFAULT; |
| 1768 | packetmax = CHAN_SES_PACKET_DEFAULT; |
Damien Miller | 19a5945 | 2002-02-19 15:20:57 +1100 | [diff] [blame] | 1769 | if (tty_flag) { |
| 1770 | window >>= 1; |
| 1771 | packetmax >>= 1; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1772 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1773 | c = channel_new( |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1774 | "session", SSH_CHANNEL_OPENING, in, out, err, |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1775 | window, packetmax, CHAN_EXTENDED_WRITE, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1776 | "client-session", /*nonblock*/0); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1777 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1778 | debug3("ssh_session2_open: channel_new: %d", c->self); |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1779 | |
Ben Lindstrom | 5ec2645 | 2001-06-09 00:18:51 +0000 | [diff] [blame] | 1780 | channel_send_open(c->self); |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1781 | if (!no_shell_flag) |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 1782 | channel_register_open_confirm(c->self, |
| 1783 | ssh_session2_setup, NULL); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1784 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1785 | return c->self; |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1786 | } |
| 1787 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1788 | static int |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1789 | ssh_session2(void) |
| 1790 | { |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1791 | int id = -1; |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1792 | |
| 1793 | /* XXX should be pre-session */ |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1794 | if (!options.control_persist) |
| 1795 | ssh_init_stdio_forwarding(); |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1796 | ssh_init_forwarding(); |
| 1797 | |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1798 | /* Start listening for multiplex clients */ |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 1799 | if (!packet_get_mux()) |
| 1800 | muxserver_listen(); |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1801 | |
| 1802 | /* |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1803 | * If we are in control persist mode and have a working mux listen |
| 1804 | * socket, then prepare to background ourselves and have a foreground |
| 1805 | * client attach as a control slave. |
| 1806 | * NB. we must save copies of the flags that we override for |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1807 | * the backgrounding, since we defer attachment of the slave until |
| 1808 | * after the connection is fully established (in particular, |
| 1809 | * async rfwd replies have been received for ExitOnForwardFailure). |
| 1810 | */ |
| 1811 | if (options.control_persist && muxserver_sock != -1) { |
| 1812 | ostdin_null_flag = stdin_null_flag; |
| 1813 | ono_shell_flag = no_shell_flag; |
Damien Miller | 21771e2 | 2011-05-15 08:45:50 +1000 | [diff] [blame] | 1814 | orequest_tty = options.request_tty; |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1815 | otty_flag = tty_flag; |
| 1816 | stdin_null_flag = 1; |
| 1817 | no_shell_flag = 1; |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1818 | tty_flag = 0; |
| 1819 | if (!fork_after_authentication_flag) |
| 1820 | need_controlpersist_detach = 1; |
| 1821 | fork_after_authentication_flag = 1; |
| 1822 | } |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1823 | /* |
| 1824 | * ControlPersist mux listen socket setup failed, attempt the |
| 1825 | * stdio forward setup that we skipped earlier. |
| 1826 | */ |
| 1827 | if (options.control_persist && muxserver_sock == -1) |
| 1828 | ssh_init_stdio_forwarding(); |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1829 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1830 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
| 1831 | id = ssh_session2_open(); |
Damien Miller | 649fe02 | 2013-07-18 16:13:55 +1000 | [diff] [blame] | 1832 | else { |
| 1833 | packet_set_interactive( |
| 1834 | options.control_master == SSHCTL_MASTER_NO, |
| 1835 | options.ip_qos_interactive, options.ip_qos_bulk); |
| 1836 | } |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1837 | |
Darren Tucker | 8901fa9 | 2008-06-11 09:34:01 +1000 | [diff] [blame] | 1838 | /* If we don't expect to open a new session, then disallow it */ |
Damien Miller | 456e6f0 | 2008-11-03 19:20:10 +1100 | [diff] [blame] | 1839 | if (options.control_master == SSHCTL_MASTER_NO && |
| 1840 | (datafellows & SSH_NEW_OPENSSH)) { |
Darren Tucker | 8901fa9 | 2008-06-11 09:34:01 +1000 | [diff] [blame] | 1841 | debug("Requesting no-more-sessions@openssh.com"); |
| 1842 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 1843 | packet_put_cstring("no-more-sessions@openssh.com"); |
| 1844 | packet_put_char(0); |
| 1845 | packet_send(); |
| 1846 | } |
| 1847 | |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1848 | /* Execute a local command */ |
| 1849 | if (options.local_command != NULL && |
| 1850 | options.permit_local_command) |
| 1851 | ssh_local_cmd(options.local_command); |
| 1852 | |
Damien Miller | 1f25ab4 | 2010-07-16 13:56:23 +1000 | [diff] [blame] | 1853 | /* |
| 1854 | * If requested and we are not interested in replies to remote |
| 1855 | * forwarding requests, then let ssh continue in the background. |
| 1856 | */ |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1857 | if (fork_after_authentication_flag) { |
| 1858 | if (options.exit_on_forward_failure && |
| 1859 | options.num_remote_forwards > 0) { |
| 1860 | debug("deferring postauth fork until remote forward " |
| 1861 | "confirmation received"); |
| 1862 | } else |
| 1863 | fork_postauth(); |
Darren Tucker | 9a2a609 | 2008-07-04 12:53:50 +1000 | [diff] [blame] | 1864 | } |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1865 | |
Ben Lindstrom | 2b1f71b | 2001-06-05 20:32:21 +0000 | [diff] [blame] | 1866 | return client_loop(tty_flag, tty_flag ? |
| 1867 | options.escape_char : SSH_ESCAPECHAR_NONE, id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1868 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1869 | |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1870 | /* Loads all IdentityFile and CertificateFile keys */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1871 | static void |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1872 | load_public_identity_files(void) |
| 1873 | { |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 1874 | char *filename, *cp, thishost[NI_MAXHOST]; |
Darren Tucker | b4fbbc6 | 2007-12-02 23:16:32 +1100 | [diff] [blame] | 1875 | char *pwdir = NULL, *pwname = NULL; |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 1876 | struct sshkey *public; |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 1877 | struct passwd *pw; |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1878 | int i; |
| 1879 | u_int n_ids, n_certs; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1880 | char *identity_files[SSH_MAX_IDENTITY_FILES]; |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 1881 | struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES]; |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1882 | char *certificate_files[SSH_MAX_CERTIFICATE_FILES]; |
| 1883 | struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES]; |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1884 | #ifdef ENABLE_PKCS11 |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 1885 | struct sshkey **keys; |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1886 | int nkeys; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1887 | #endif /* PKCS11 */ |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1888 | |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1889 | n_ids = n_certs = 0; |
Damien Miller | 1d2c456 | 2014-02-04 11:18:20 +1100 | [diff] [blame] | 1890 | memset(identity_files, 0, sizeof(identity_files)); |
| 1891 | memset(identity_keys, 0, sizeof(identity_keys)); |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1892 | memset(certificate_files, 0, sizeof(certificate_files)); |
| 1893 | memset(certificates, 0, sizeof(certificates)); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1894 | |
| 1895 | #ifdef ENABLE_PKCS11 |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1896 | if (options.pkcs11_provider != NULL && |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1897 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1898 | (pkcs11_init(!options.batch_mode) == 0) && |
| 1899 | (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL, |
| 1900 | &keys)) > 0) { |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1901 | for (i = 0; i < nkeys; i++) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1902 | if (n_ids >= SSH_MAX_IDENTITY_FILES) { |
| 1903 | key_free(keys[i]); |
| 1904 | continue; |
| 1905 | } |
| 1906 | identity_keys[n_ids] = keys[i]; |
| 1907 | identity_files[n_ids] = |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1908 | xstrdup(options.pkcs11_provider); /* XXX */ |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1909 | n_ids++; |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1910 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1911 | free(keys); |
Ben Lindstrom | 711b04a | 2001-08-06 21:12:42 +0000 | [diff] [blame] | 1912 | } |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1913 | #endif /* ENABLE_PKCS11 */ |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 1914 | if ((pw = getpwuid(original_real_uid)) == NULL) |
| 1915 | fatal("load_public_identity_files: getpwuid failed"); |
Darren Tucker | e143f06 | 2007-12-02 23:21:16 +1100 | [diff] [blame] | 1916 | pwname = xstrdup(pw->pw_name); |
| 1917 | pwdir = xstrdup(pw->pw_dir); |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 1918 | if (gethostname(thishost, sizeof(thishost)) == -1) |
| 1919 | fatal("load_public_identity_files: gethostname: %s", |
| 1920 | strerror(errno)); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1921 | for (i = 0; i < options.num_identity_files; i++) { |
Darren Tucker | 15fd19c | 2013-04-05 11:22:26 +1100 | [diff] [blame] | 1922 | if (n_ids >= SSH_MAX_IDENTITY_FILES || |
| 1923 | strcasecmp(options.identity_files[i], "none") == 0) { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1924 | free(options.identity_files[i]); |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1925 | options.identity_files[i] = NULL; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1926 | continue; |
| 1927 | } |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 1928 | cp = tilde_expand_filename(options.identity_files[i], |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1929 | original_real_uid); |
Darren Tucker | b4fbbc6 | 2007-12-02 23:16:32 +1100 | [diff] [blame] | 1930 | filename = percent_expand(cp, "d", pwdir, |
| 1931 | "u", pwname, "l", thishost, "h", host, |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 1932 | "r", options.user, (char *)NULL); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1933 | free(cp); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 1934 | public = key_load_public(filename, NULL); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1935 | debug("identity file %s type %d", filename, |
| 1936 | public ? public->type : -1); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1937 | free(options.identity_files[i]); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1938 | identity_files[n_ids] = filename; |
| 1939 | identity_keys[n_ids] = public; |
| 1940 | |
| 1941 | if (++n_ids >= SSH_MAX_IDENTITY_FILES) |
| 1942 | continue; |
| 1943 | |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1944 | /* |
| 1945 | * If no certificates have been explicitly listed then try |
| 1946 | * to add the default certificate variant too. |
| 1947 | */ |
| 1948 | if (options.num_certificate_files != 0) |
| 1949 | continue; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1950 | xasprintf(&cp, "%s-cert", filename); |
| 1951 | public = key_load_public(cp, NULL); |
| 1952 | debug("identity file %s type %d", cp, |
| 1953 | public ? public->type : -1); |
| 1954 | if (public == NULL) { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1955 | free(cp); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1956 | continue; |
| 1957 | } |
| 1958 | if (!key_is_cert(public)) { |
| 1959 | debug("%s: key %s type %s is not a certificate", |
| 1960 | __func__, cp, key_type(public)); |
| 1961 | key_free(public); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1962 | free(cp); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1963 | continue; |
| 1964 | } |
djm@openbsd.org | b4867e0 | 2016-12-06 07:48:01 +0000 | [diff] [blame] | 1965 | /* NB. leave filename pointing to private key */ |
| 1966 | identity_files[n_ids] = xstrdup(filename); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1967 | identity_keys[n_ids] = public; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1968 | n_ids++; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1969 | } |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1970 | |
| 1971 | if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES) |
| 1972 | fatal("%s: too many certificates", __func__); |
| 1973 | for (i = 0; i < options.num_certificate_files; i++) { |
| 1974 | cp = tilde_expand_filename(options.certificate_files[i], |
| 1975 | original_real_uid); |
| 1976 | filename = percent_expand(cp, "d", pwdir, |
| 1977 | "u", pwname, "l", thishost, "h", host, |
| 1978 | "r", options.user, (char *)NULL); |
| 1979 | free(cp); |
| 1980 | |
| 1981 | public = key_load_public(filename, NULL); |
| 1982 | debug("certificate file %s type %d", filename, |
| 1983 | public ? public->type : -1); |
| 1984 | free(options.certificate_files[i]); |
| 1985 | options.certificate_files[i] = NULL; |
| 1986 | if (public == NULL) { |
| 1987 | free(filename); |
| 1988 | continue; |
| 1989 | } |
| 1990 | if (!key_is_cert(public)) { |
| 1991 | debug("%s: key %s type %s is not a certificate", |
| 1992 | __func__, filename, key_type(public)); |
| 1993 | key_free(public); |
| 1994 | free(filename); |
| 1995 | continue; |
| 1996 | } |
| 1997 | certificate_files[n_certs] = filename; |
| 1998 | certificates[n_certs] = public; |
| 1999 | ++n_certs; |
| 2000 | } |
| 2001 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 2002 | options.num_identity_files = n_ids; |
| 2003 | memcpy(options.identity_files, identity_files, sizeof(identity_files)); |
| 2004 | memcpy(options.identity_keys, identity_keys, sizeof(identity_keys)); |
| 2005 | |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 2006 | options.num_certificate_files = n_certs; |
| 2007 | memcpy(options.certificate_files, |
| 2008 | certificate_files, sizeof(certificate_files)); |
| 2009 | memcpy(options.certificates, certificates, sizeof(certificates)); |
| 2010 | |
Damien Miller | 1d2c456 | 2014-02-04 11:18:20 +1100 | [diff] [blame] | 2011 | explicit_bzero(pwname, strlen(pwname)); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2012 | free(pwname); |
Damien Miller | 1d2c456 | 2014-02-04 11:18:20 +1100 | [diff] [blame] | 2013 | explicit_bzero(pwdir, strlen(pwdir)); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2014 | free(pwdir); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 2015 | } |
Damien Miller | 857b02e | 2010-09-24 22:02:56 +1000 | [diff] [blame] | 2016 | |
| 2017 | static void |
| 2018 | main_sigchld_handler(int sig) |
| 2019 | { |
| 2020 | int save_errno = errno; |
| 2021 | pid_t pid; |
| 2022 | int status; |
| 2023 | |
| 2024 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || |
| 2025 | (pid < 0 && errno == EINTR)) |
| 2026 | ; |
| 2027 | |
| 2028 | signal(sig, main_sigchld_handler); |
| 2029 | errno = save_errno; |
| 2030 | } |