dtucker@openbsd.org | 4f7cc2f | 2015-09-04 08:21:47 +0000 | [diff] [blame^] | 1 | /* $OpenBSD: ssh.c,v 1.422 2015/09/04 08:21:47 dtucker 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> |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 70 | |
Darren Tucker | 46aa3e0 | 2006-09-02 15:32:40 +1000 | [diff] [blame] | 71 | #include <netinet/in.h> |
| 72 | #include <arpa/inet.h> |
| 73 | |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 74 | #ifdef WITH_OPENSSL |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 75 | #include <openssl/evp.h> |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 76 | #include <openssl/err.h> |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 77 | #endif |
Darren Tucker | bfaaf96 | 2008-02-28 19:13:52 +1100 | [diff] [blame] | 78 | #include "openbsd-compat/openssl-compat.h" |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 79 | #include "openbsd-compat/sys-queue.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 80 | |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 81 | #include "xmalloc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 82 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 83 | #include "ssh1.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" |
Darren Tucker | f1de4e5 | 2010-01-08 16:54:59 +1100 | [diff] [blame] | 108 | #include "roaming.h" |
Damien Miller | b757677 | 2006-07-10 20:23:39 +1000 | [diff] [blame] | 109 | #include "version.h" |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 110 | #include "ssherr.h" |
djm@openbsd.org | f9eca24 | 2015-07-30 00:01:34 +0000 | [diff] [blame] | 111 | #include "myproposal.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 | |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 155 | /* forward stdio to remote host and port */ |
| 156 | char *stdio_forward_host = NULL; |
| 157 | int stdio_forward_port = 0; |
| 158 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 159 | /* |
| 160 | * General data structure for command line options and options configurable |
| 161 | * in configuration files. See readconf.h. |
| 162 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 163 | Options options; |
| 164 | |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 165 | /* optional user configfile */ |
| 166 | char *config = NULL; |
| 167 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 168 | /* |
| 169 | * Name of the host we are connecting to. This is the name given on the |
| 170 | * command line, or the HostName specified for the user-supplied name in a |
| 171 | * configuration file. |
| 172 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 173 | char *host; |
| 174 | |
| 175 | /* socket address the host resolves to */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 176 | struct sockaddr_storage hostaddr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 177 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 178 | /* Private host keys. */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 179 | Sensitive sensitive_data; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 180 | |
| 181 | /* Original real UID. */ |
| 182 | uid_t original_real_uid; |
Ben Lindstrom | f9c4884 | 2002-06-11 16:37:51 +0000 | [diff] [blame] | 183 | uid_t original_effective_uid; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 184 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 185 | /* command to be executed */ |
| 186 | Buffer command; |
| 187 | |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 188 | /* Should we execute a command or invoke a subsystem? */ |
| 189 | int subsystem_flag = 0; |
| 190 | |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame] | 191 | /* # of replies received for global requests */ |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 192 | static int remote_forward_confirms_received = 0; |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame] | 193 | |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 194 | /* mux.c */ |
| 195 | extern int muxserver_sock; |
| 196 | extern u_int muxclient_command; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 197 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 198 | /* Prints a help message to the user. This function never returns. */ |
| 199 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 200 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 201 | usage(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 202 | { |
Damien Miller | 5095510 | 2004-03-22 09:34:58 +1100 | [diff] [blame] | 203 | fprintf(stderr, |
jmc@openbsd.org | b1ba15f | 2014-10-09 06:21:31 +0000 | [diff] [blame] | 204 | "usage: ssh [-1246AaCfGgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n" |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 205 | " [-D [bind_address:]port] [-E log_file] [-e escape_char]\n" |
| 206 | " [-F configfile] [-I pkcs11] [-i identity_file]\n" |
millert@openbsd.org | d5d91d0 | 2015-07-20 18:42:35 +0000 | [diff] [blame] | 207 | " [-L address] [-l login_name] [-m mac_spec]\n" |
Damien Miller | bdb352a | 2013-12-05 10:20:52 +1100 | [diff] [blame] | 208 | " [-O ctl_cmd] [-o option] [-p port]\n" |
| 209 | " [-Q cipher | cipher-auth | mac | kex | key]\n" |
millert@openbsd.org | d5d91d0 | 2015-07-20 18:42:35 +0000 | [diff] [blame] | 210 | " [-R address] [-S ctl_path] [-W host:port]\n" |
Damien Miller | bdb352a | 2013-12-05 10:20:52 +1100 | [diff] [blame] | 211 | " [-w local_tun[:remote_tun]] [user@]hostname [command]\n" |
Damien Miller | 5095510 | 2004-03-22 09:34:58 +1100 | [diff] [blame] | 212 | ); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 213 | exit(255); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 214 | } |
| 215 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 216 | static int ssh_session(void); |
| 217 | static int ssh_session2(void); |
| 218 | static void load_public_identity_files(void); |
Damien Miller | 857b02e | 2010-09-24 22:02:56 +1000 | [diff] [blame] | 219 | static void main_sigchld_handler(int); |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 220 | |
| 221 | /* from muxclient.c */ |
| 222 | void muxclient(const char *); |
| 223 | void muxserver_listen(void); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 224 | |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 225 | /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */ |
| 226 | static void |
| 227 | tilde_expand_paths(char **paths, u_int num_paths) |
| 228 | { |
| 229 | u_int i; |
| 230 | char *cp; |
| 231 | |
| 232 | for (i = 0; i < num_paths; i++) { |
| 233 | cp = tilde_expand_filename(paths[i], original_real_uid); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 234 | free(paths[i]); |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 235 | paths[i] = cp; |
| 236 | } |
| 237 | } |
| 238 | |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 239 | /* |
| 240 | * Attempt to resolve a host name / port to a set of addresses and |
| 241 | * optionally return any CNAMEs encountered along the way. |
| 242 | * Returns NULL on failure. |
| 243 | * NB. this function must operate with a options having undefined members. |
| 244 | */ |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 245 | static struct addrinfo * |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 246 | 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] | 247 | { |
| 248 | char strport[NI_MAXSERV]; |
| 249 | struct addrinfo hints, *res; |
| 250 | int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1; |
| 251 | |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 252 | if (port <= 0) |
| 253 | port = default_ssh_port(); |
| 254 | |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 255 | snprintf(strport, sizeof strport, "%u", port); |
Damien Miller | 1d2c456 | 2014-02-04 11:18:20 +1100 | [diff] [blame] | 256 | memset(&hints, 0, sizeof(hints)); |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 257 | hints.ai_family = options.address_family == -1 ? |
| 258 | AF_UNSPEC : options.address_family; |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 259 | hints.ai_socktype = SOCK_STREAM; |
| 260 | if (cname != NULL) |
| 261 | hints.ai_flags = AI_CANONNAME; |
| 262 | if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) { |
| 263 | if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA)) |
| 264 | loglevel = SYSLOG_LEVEL_ERROR; |
| 265 | do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s", |
| 266 | __progname, name, ssh_gai_strerror(gaierr)); |
| 267 | return NULL; |
| 268 | } |
| 269 | if (cname != NULL && res->ai_canonname != NULL) { |
| 270 | if (strlcpy(cname, res->ai_canonname, clen) >= clen) { |
| 271 | error("%s: host \"%s\" cname \"%s\" too long (max %lu)", |
| 272 | __func__, name, res->ai_canonname, (u_long)clen); |
| 273 | if (clen > 0) |
| 274 | *cname = '\0'; |
| 275 | } |
| 276 | } |
| 277 | return res; |
| 278 | } |
| 279 | |
| 280 | /* |
djm@openbsd.org | 9010902 | 2015-01-16 07:19:48 +0000 | [diff] [blame] | 281 | * Attempt to resolve a numeric host address / port to a single address. |
| 282 | * Returns a canonical address string. |
| 283 | * Returns NULL on failure. |
| 284 | * NB. this function must operate with a options having undefined members. |
| 285 | */ |
| 286 | static struct addrinfo * |
| 287 | resolve_addr(const char *name, int port, char *caddr, size_t clen) |
| 288 | { |
| 289 | char addr[NI_MAXHOST], strport[NI_MAXSERV]; |
| 290 | struct addrinfo hints, *res; |
| 291 | int gaierr; |
| 292 | |
| 293 | if (port <= 0) |
| 294 | port = default_ssh_port(); |
| 295 | snprintf(strport, sizeof strport, "%u", port); |
| 296 | memset(&hints, 0, sizeof(hints)); |
| 297 | hints.ai_family = options.address_family == -1 ? |
| 298 | AF_UNSPEC : options.address_family; |
| 299 | hints.ai_socktype = SOCK_STREAM; |
| 300 | hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV; |
| 301 | if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) { |
| 302 | debug2("%s: could not resolve name %.100s as address: %s", |
| 303 | __func__, name, ssh_gai_strerror(gaierr)); |
| 304 | return NULL; |
| 305 | } |
| 306 | if (res == NULL) { |
| 307 | debug("%s: getaddrinfo %.100s returned no addresses", |
| 308 | __func__, name); |
| 309 | return NULL; |
| 310 | } |
| 311 | if (res->ai_next != NULL) { |
| 312 | debug("%s: getaddrinfo %.100s returned multiple addresses", |
| 313 | __func__, name); |
| 314 | goto fail; |
| 315 | } |
| 316 | if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen, |
| 317 | addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) { |
| 318 | debug("%s: Could not format address for name %.100s: %s", |
| 319 | __func__, name, ssh_gai_strerror(gaierr)); |
| 320 | goto fail; |
| 321 | } |
| 322 | if (strlcpy(caddr, addr, clen) >= clen) { |
| 323 | error("%s: host \"%s\" addr \"%s\" too long (max %lu)", |
| 324 | __func__, name, addr, (u_long)clen); |
| 325 | if (clen > 0) |
| 326 | *caddr = '\0'; |
| 327 | fail: |
| 328 | freeaddrinfo(res); |
| 329 | return NULL; |
| 330 | } |
| 331 | return res; |
| 332 | } |
| 333 | |
| 334 | /* |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 335 | * Check whether the cname is a permitted replacement for the hostname |
| 336 | * and perform the replacement if it is. |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 337 | * NB. this function must operate with a options having undefined members. |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 338 | */ |
| 339 | static int |
| 340 | check_follow_cname(char **namep, const char *cname) |
| 341 | { |
| 342 | int i; |
| 343 | struct allowed_cname *rule; |
| 344 | |
| 345 | if (*cname == '\0' || options.num_permitted_cnames == 0 || |
| 346 | strcmp(*namep, cname) == 0) |
| 347 | return 0; |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 348 | if (options.canonicalize_hostname == SSH_CANONICALISE_NO) |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 349 | return 0; |
| 350 | /* |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 351 | * Don't attempt to canonicalize names that will be interpreted by |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 352 | * a proxy unless the user specifically requests so. |
| 353 | */ |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 354 | if (!option_clear_or_none(options.proxy_command) && |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 355 | options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS) |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 356 | return 0; |
| 357 | debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname); |
| 358 | for (i = 0; i < options.num_permitted_cnames; i++) { |
| 359 | rule = options.permitted_cnames + i; |
djm@openbsd.org | e661a86 | 2015-05-04 06:10:48 +0000 | [diff] [blame] | 360 | if (match_pattern_list(*namep, rule->source_list, 1) != 1 || |
| 361 | match_pattern_list(cname, rule->target_list, 1) != 1) |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 362 | continue; |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 363 | verbose("Canonicalized DNS aliased hostname " |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 364 | "\"%s\" => \"%s\"", *namep, cname); |
| 365 | free(*namep); |
| 366 | *namep = xstrdup(cname); |
| 367 | return 1; |
| 368 | } |
| 369 | return 0; |
| 370 | } |
| 371 | |
| 372 | /* |
| 373 | * Attempt to resolve the supplied hostname after applying the user's |
Damien Miller | 51682fa | 2013-10-17 11:48:31 +1100 | [diff] [blame] | 374 | * canonicalization rules. Returns the address list for the host or NULL |
| 375 | * if no name was found after canonicalization. |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 376 | * NB. this function must operate with a options having undefined members. |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 377 | */ |
| 378 | static struct addrinfo * |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 379 | resolve_canonicalize(char **hostp, int port) |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 380 | { |
| 381 | int i, ndots; |
djm@openbsd.org | 9010902 | 2015-01-16 07:19:48 +0000 | [diff] [blame] | 382 | char *cp, *fullhost, newname[NI_MAXHOST]; |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 383 | struct addrinfo *addrs; |
| 384 | |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 385 | if (options.canonicalize_hostname == SSH_CANONICALISE_NO) |
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 | |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 388 | /* |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 389 | * Don't attempt to canonicalize names that will be interpreted by |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 390 | * a proxy unless the user specifically requests so. |
| 391 | */ |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 392 | if (!option_clear_or_none(options.proxy_command) && |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 393 | options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS) |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 394 | return NULL; |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 395 | |
djm@openbsd.org | 9010902 | 2015-01-16 07:19:48 +0000 | [diff] [blame] | 396 | /* Try numeric hostnames first */ |
| 397 | if ((addrs = resolve_addr(*hostp, port, |
| 398 | newname, sizeof(newname))) != NULL) { |
| 399 | debug2("%s: hostname %.100s is address", __func__, *hostp); |
| 400 | if (strcasecmp(*hostp, newname) != 0) { |
| 401 | debug2("%s: canonicalised address \"%s\" => \"%s\"", |
| 402 | __func__, *hostp, newname); |
| 403 | free(*hostp); |
| 404 | *hostp = xstrdup(newname); |
| 405 | } |
| 406 | return addrs; |
| 407 | } |
| 408 | |
Damien Miller | 51682fa | 2013-10-17 11:48:31 +1100 | [diff] [blame] | 409 | /* Don't apply canonicalization to sufficiently-qualified hostnames */ |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 410 | ndots = 0; |
| 411 | for (cp = *hostp; *cp != '\0'; cp++) { |
| 412 | if (*cp == '.') |
| 413 | ndots++; |
| 414 | } |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 415 | if (ndots > options.canonicalize_max_dots) { |
| 416 | debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)", |
| 417 | __func__, *hostp, options.canonicalize_max_dots); |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 418 | return NULL; |
| 419 | } |
| 420 | /* Attempt each supplied suffix */ |
| 421 | for (i = 0; i < options.num_canonical_domains; i++) { |
djm@openbsd.org | 9010902 | 2015-01-16 07:19:48 +0000 | [diff] [blame] | 422 | *newname = '\0'; |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 423 | xasprintf(&fullhost, "%s.%s.", *hostp, |
| 424 | options.canonical_domains[i]); |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 425 | debug3("%s: attempting \"%s\" => \"%s\"", __func__, |
| 426 | *hostp, fullhost); |
| 427 | if ((addrs = resolve_host(fullhost, port, 0, |
djm@openbsd.org | 9010902 | 2015-01-16 07:19:48 +0000 | [diff] [blame] | 428 | newname, sizeof(newname))) == NULL) { |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 429 | free(fullhost); |
| 430 | continue; |
| 431 | } |
| 432 | /* Remove trailing '.' */ |
| 433 | fullhost[strlen(fullhost) - 1] = '\0'; |
| 434 | /* Follow CNAME if requested */ |
djm@openbsd.org | 9010902 | 2015-01-16 07:19:48 +0000 | [diff] [blame] | 435 | if (!check_follow_cname(&fullhost, newname)) { |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 436 | debug("Canonicalized hostname \"%s\" => \"%s\"", |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 437 | *hostp, fullhost); |
| 438 | } |
| 439 | free(*hostp); |
| 440 | *hostp = fullhost; |
| 441 | return addrs; |
| 442 | } |
Damien Miller | 3850559 | 2013-10-17 11:48:13 +1100 | [diff] [blame] | 443 | if (!options.canonicalize_fallback_local) |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 444 | fatal("%s: Could not resolve host \"%s\"", __progname, *hostp); |
| 445 | debug2("%s: host %s not found in any suffix", __func__, *hostp); |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 446 | return NULL; |
| 447 | } |
| 448 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 449 | /* |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 450 | * Read per-user configuration file. Ignore the system wide config |
| 451 | * file if the user specifies a config file on the command line. |
| 452 | */ |
| 453 | static void |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 454 | 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] | 455 | { |
deraadt@openbsd.org | 087266e | 2015-01-20 23:14:00 +0000 | [diff] [blame] | 456 | char buf[PATH_MAX]; |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 457 | int r; |
| 458 | |
| 459 | if (config != NULL) { |
| 460 | if (strcasecmp(config, "none") != 0 && |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 461 | !read_config_file(config, pw, host, host_arg, &options, |
| 462 | SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0))) |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 463 | fatal("Can't open user config file %.100s: " |
| 464 | "%.100s", config, strerror(errno)); |
| 465 | } else { |
| 466 | r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, |
| 467 | _PATH_SSH_USER_CONFFILE); |
| 468 | if (r > 0 && (size_t)r < sizeof(buf)) |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 469 | (void)read_config_file(buf, pw, host, host_arg, |
| 470 | &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF | |
| 471 | (post_canon ? SSHCONF_POSTCANON : 0)); |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 472 | |
| 473 | /* Read systemwide configuration file after user config. */ |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 474 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw, |
| 475 | host, host_arg, &options, |
| 476 | post_canon ? SSHCONF_POSTCANON : 0); |
| 477 | } |
| 478 | } |
| 479 | |
| 480 | /* Rewrite the port number in an addrinfo list of addresses */ |
| 481 | static void |
| 482 | set_addrinfo_port(struct addrinfo *addrs, int port) |
| 483 | { |
| 484 | struct addrinfo *addr; |
| 485 | |
| 486 | for (addr = addrs; addr != NULL; addr = addr->ai_next) { |
| 487 | switch (addr->ai_family) { |
| 488 | case AF_INET: |
| 489 | ((struct sockaddr_in *)addr->ai_addr)-> |
| 490 | sin_port = htons(port); |
| 491 | break; |
| 492 | case AF_INET6: |
| 493 | ((struct sockaddr_in6 *)addr->ai_addr)-> |
| 494 | sin6_port = htons(port); |
| 495 | break; |
| 496 | } |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 497 | } |
| 498 | } |
| 499 | |
| 500 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 501 | * Main program for the ssh client. |
| 502 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 503 | int |
| 504 | main(int ac, char **av) |
| 505 | { |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 506 | int i, r, opt, exit_status, use_syslog, config_test = 0; |
deraadt@openbsd.org | 087266e | 2015-01-20 23:14:00 +0000 | [diff] [blame] | 507 | char *p, *cp, *line, *argv0, buf[PATH_MAX], *host_arg, *logfile; |
Damien Miller | dfc85fa | 2011-05-15 08:44:02 +1000 | [diff] [blame] | 508 | char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV]; |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 509 | char cname[NI_MAXHOST]; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 510 | struct stat st; |
Ben Lindstrom | 086cf21 | 2001-03-05 05:56:40 +0000 | [diff] [blame] | 511 | struct passwd *pw; |
Damien Miller | 194fd90 | 2013-10-15 12:13:05 +1100 | [diff] [blame] | 512 | int timeout_ms; |
Ben Lindstrom | 5ccf63a | 2001-09-24 20:00:10 +0000 | [diff] [blame] | 513 | extern int optind, optreset; |
Damien Miller | 4f8e669 | 2001-07-14 13:22:53 +1000 | [diff] [blame] | 514 | extern char *optarg; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 515 | struct Forward fwd; |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 516 | struct addrinfo *addrs = NULL; |
Damien Miller | 9c38643 | 2014-07-03 21:27:46 +1000 | [diff] [blame] | 517 | struct ssh_digest_ctx *md; |
| 518 | u_char conn_hash[SSH_DIGEST_MAX_LENGTH]; |
| 519 | char *conn_hash_hex; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 520 | |
Darren Tucker | ce321d8 | 2005-10-03 18:11:24 +1000 | [diff] [blame] | 521 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
| 522 | sanitise_stdfd(); |
| 523 | |
Damien Miller | 59d3d5b | 2003-08-22 09:34:41 +1000 | [diff] [blame] | 524 | __progname = ssh_get_progname(av[0]); |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 525 | |
Damien Miller | ea2c1a4 | 2011-06-03 12:10:22 +1000 | [diff] [blame] | 526 | #ifndef HAVE_SETPROCTITLE |
| 527 | /* Prepare for later setproctitle emulation */ |
| 528 | /* Save argv so it isn't clobbered by setproctitle() emulation */ |
| 529 | saved_av = xcalloc(ac + 1, sizeof(*saved_av)); |
| 530 | for (i = 0; i < ac; i++) |
| 531 | saved_av[i] = xstrdup(av[i]); |
| 532 | saved_av[i] = NULL; |
| 533 | compat_init_setproctitle(ac, av); |
| 534 | av = saved_av; |
| 535 | #endif |
| 536 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 537 | /* |
Damien Miller | 00d9ae2 | 2010-08-17 01:59:31 +1000 | [diff] [blame] | 538 | * Discard other fds that are hanging around. These can cause problem |
| 539 | * with backgrounded ssh processes started by ControlPersist. |
| 540 | */ |
| 541 | closefrom(STDERR_FILENO + 1); |
| 542 | |
| 543 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 544 | * Save the original real uid. It will be needed later (uid-swapping |
| 545 | * may clobber the real uid). |
| 546 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 547 | original_real_uid = getuid(); |
| 548 | original_effective_uid = geteuid(); |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 549 | |
Damien Miller | 50b9a60 | 2002-09-04 16:50:06 +1000 | [diff] [blame] | 550 | /* |
| 551 | * Use uid-swapping to give up root privileges for the duration of |
| 552 | * option processing. We will re-instantiate the rights when we are |
| 553 | * ready to create the privileged port, and will permanently drop |
| 554 | * them when the port has been created (actually, when the connection |
| 555 | * has been made, as we may need to create the port several times). |
| 556 | */ |
| 557 | PRIV_END; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 558 | |
Damien Miller | 05dd795 | 2000-10-01 00:42:48 +1100 | [diff] [blame] | 559 | #ifdef HAVE_SETRLIMIT |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 560 | /* If we are installed setuid root be careful to not drop core. */ |
| 561 | if (original_real_uid != original_effective_uid) { |
| 562 | struct rlimit rlim; |
| 563 | rlim.rlim_cur = rlim.rlim_max = 0; |
| 564 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) |
| 565 | fatal("setrlimit failed: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 566 | } |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 567 | #endif |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 568 | /* Get user data. */ |
| 569 | pw = getpwuid(original_real_uid); |
| 570 | if (!pw) { |
Damien Miller | 3009d3c | 2013-07-20 13:22:31 +1000 | [diff] [blame] | 571 | logit("No user exists for uid %lu", (u_long)original_real_uid); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 572 | exit(255); |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 573 | } |
| 574 | /* Take a copy of the returned structure. */ |
| 575 | pw = pwcopy(pw); |
| 576 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 577 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 578 | * Set our umask to something reasonable, as some files are created |
| 579 | * with the default umask. This will make them world-readable but |
| 580 | * writable only by the owner, which is ok for all files for which we |
| 581 | * don't set the modes explicitly. |
| 582 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 583 | umask(022); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 584 | |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 585 | /* |
| 586 | * Initialize option structure to indicate that no values have been |
| 587 | * set. |
| 588 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 589 | initialize_options(&options); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 590 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 591 | /* Parse command-line arguments. */ |
| 592 | host = NULL; |
Damien Miller | e272a5b | 2008-11-03 19:22:37 +1100 | [diff] [blame] | 593 | use_syslog = 0; |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 594 | logfile = NULL; |
Darren Tucker | 72efd74 | 2009-06-21 17:48:00 +1000 | [diff] [blame] | 595 | argv0 = av[0]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 596 | |
Damien Miller | 2ecb6bd | 2006-03-15 12:03:53 +1100 | [diff] [blame] | 597 | again: |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 598 | while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx" |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 599 | "ACD:E:F:GI:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 600 | switch (opt) { |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 601 | case '1': |
| 602 | options.protocol = SSH_PROTO_1; |
| 603 | break; |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 604 | case '2': |
| 605 | options.protocol = SSH_PROTO_2; |
| 606 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 607 | case '4': |
Darren Tucker | 0a4f04b | 2003-07-03 20:37:47 +1000 | [diff] [blame] | 608 | options.address_family = AF_INET; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 609 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 610 | case '6': |
Darren Tucker | 0a4f04b | 2003-07-03 20:37:47 +1000 | [diff] [blame] | 611 | options.address_family = AF_INET6; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 612 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 613 | case 'n': |
| 614 | stdin_null_flag = 1; |
| 615 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 616 | case 'f': |
| 617 | fork_after_authentication_flag = 1; |
| 618 | stdin_null_flag = 1; |
| 619 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 620 | case 'x': |
| 621 | options.forward_x11 = 0; |
| 622 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 623 | case 'X': |
| 624 | options.forward_x11 = 1; |
| 625 | break; |
Damien Miller | e272a5b | 2008-11-03 19:22:37 +1100 | [diff] [blame] | 626 | case 'y': |
| 627 | use_syslog = 1; |
| 628 | break; |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 629 | case 'E': |
dtucker@openbsd.org | 4f7cc2f | 2015-09-04 08:21:47 +0000 | [diff] [blame^] | 630 | logfile = optarg; |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 631 | break; |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 632 | case 'G': |
| 633 | config_test = 1; |
| 634 | break; |
Darren Tucker | 0a118da | 2003-10-15 15:54:32 +1000 | [diff] [blame] | 635 | case 'Y': |
| 636 | options.forward_x11 = 1; |
| 637 | options.forward_x11_trusted = 1; |
| 638 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 639 | case 'g': |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 640 | options.fwd_opts.gateway_ports = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 641 | break; |
Darren Tucker | 7ebfc10 | 2004-11-07 20:06:19 +1100 | [diff] [blame] | 642 | case 'O': |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 643 | if (stdio_forward_host != NULL) |
| 644 | fatal("Cannot specify multiplexing " |
| 645 | "command with -W"); |
| 646 | else if (muxclient_command != 0) |
| 647 | fatal("Multiplexing command already specified"); |
Darren Tucker | 7ebfc10 | 2004-11-07 20:06:19 +1100 | [diff] [blame] | 648 | if (strcmp(optarg, "check") == 0) |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 649 | muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK; |
Damien Miller | 388f6fc | 2010-05-21 14:57:35 +1000 | [diff] [blame] | 650 | else if (strcmp(optarg, "forward") == 0) |
| 651 | muxclient_command = SSHMUX_COMMAND_FORWARD; |
Darren Tucker | 7ebfc10 | 2004-11-07 20:06:19 +1100 | [diff] [blame] | 652 | else if (strcmp(optarg, "exit") == 0) |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 653 | muxclient_command = SSHMUX_COMMAND_TERMINATE; |
Damien Miller | 6c3eec7 | 2011-05-05 14:16:22 +1000 | [diff] [blame] | 654 | else if (strcmp(optarg, "stop") == 0) |
| 655 | muxclient_command = SSHMUX_COMMAND_STOP; |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 656 | else if (strcmp(optarg, "cancel") == 0) |
| 657 | muxclient_command = SSHMUX_COMMAND_CANCEL_FWD; |
Darren Tucker | 7ebfc10 | 2004-11-07 20:06:19 +1100 | [diff] [blame] | 658 | else |
| 659 | fatal("Invalid multiplex command."); |
| 660 | break; |
Damien Miller | 147bba3 | 2002-09-04 16:46:06 +1000 | [diff] [blame] | 661 | case 'P': /* deprecated */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 662 | options.use_privileged_port = 0; |
| 663 | break; |
Damien Miller | d937dc0 | 2013-12-05 10:19:54 +1100 | [diff] [blame] | 664 | case 'Q': |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 665 | cp = NULL; |
Damien Miller | d937dc0 | 2013-12-05 10:19:54 +1100 | [diff] [blame] | 666 | if (strcmp(optarg, "cipher") == 0) |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 667 | cp = cipher_alg_list('\n', 0); |
Damien Miller | d937dc0 | 2013-12-05 10:19:54 +1100 | [diff] [blame] | 668 | else if (strcmp(optarg, "cipher-auth") == 0) |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 669 | cp = cipher_alg_list('\n', 1); |
Damien Miller | d937dc0 | 2013-12-05 10:19:54 +1100 | [diff] [blame] | 670 | else if (strcmp(optarg, "mac") == 0) |
Damien Miller | 690d989 | 2013-11-08 12:16:49 +1100 | [diff] [blame] | 671 | cp = mac_alg_list('\n'); |
Damien Miller | d937dc0 | 2013-12-05 10:19:54 +1100 | [diff] [blame] | 672 | else if (strcmp(optarg, "kex") == 0) |
Damien Miller | 690d989 | 2013-11-08 12:16:49 +1100 | [diff] [blame] | 673 | cp = kex_alg_list('\n'); |
Damien Miller | d937dc0 | 2013-12-05 10:19:54 +1100 | [diff] [blame] | 674 | else if (strcmp(optarg, "key") == 0) |
Damien Miller | 5be9d9e | 2013-12-07 11:24:01 +1100 | [diff] [blame] | 675 | cp = key_alg_list(0, 0); |
| 676 | else if (strcmp(optarg, "key-cert") == 0) |
| 677 | cp = key_alg_list(1, 0); |
| 678 | else if (strcmp(optarg, "key-plain") == 0) |
| 679 | cp = key_alg_list(0, 1); |
djm@openbsd.org | 68d2dfc | 2015-03-03 06:48:58 +0000 | [diff] [blame] | 680 | else if (strcmp(optarg, "protocol-version") == 0) { |
| 681 | #ifdef WITH_SSH1 |
| 682 | cp = xstrdup("1\n2"); |
| 683 | #else |
| 684 | cp = xstrdup("2"); |
| 685 | #endif |
| 686 | } |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 687 | if (cp == NULL) |
| 688 | fatal("Unsupported query \"%s\"", optarg); |
| 689 | printf("%s\n", cp); |
| 690 | free(cp); |
| 691 | exit(0); |
| 692 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 693 | case 'a': |
| 694 | options.forward_agent = 0; |
| 695 | break; |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 696 | case 'A': |
| 697 | options.forward_agent = 1; |
| 698 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 699 | case 'k': |
Damien Miller | e0113cc | 2003-11-24 13:10:09 +1100 | [diff] [blame] | 700 | options.gss_deleg_creds = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 701 | break; |
Darren Tucker | 415bddc | 2007-06-12 23:43:16 +1000 | [diff] [blame] | 702 | case 'K': |
| 703 | options.gss_authentication = 1; |
| 704 | options.gss_deleg_creds = 1; |
| 705 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 706 | case 'i': |
| 707 | if (stat(optarg, &st) < 0) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 708 | fprintf(stderr, "Warning: Identity file %s " |
Damien Miller | 3eb48b6 | 2005-03-01 21:15:46 +1100 | [diff] [blame] | 709 | "not accessible: %s.\n", optarg, |
| 710 | strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 711 | break; |
| 712 | } |
Darren Tucker | 1910478 | 2013-04-05 11:13:08 +1100 | [diff] [blame] | 713 | add_identity_file(&options, NULL, optarg, 1); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 714 | break; |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 715 | case 'I': |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 716 | #ifdef ENABLE_PKCS11 |
dtucker@openbsd.org | 4f7cc2f | 2015-09-04 08:21:47 +0000 | [diff] [blame^] | 717 | free(options.pkcs11_provider); |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 718 | options.pkcs11_provider = xstrdup(optarg); |
Ben Lindstrom | bcc1808 | 2001-08-06 21:59:25 +0000 | [diff] [blame] | 719 | #else |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 720 | fprintf(stderr, "no support for PKCS#11.\n"); |
Ben Lindstrom | bcc1808 | 2001-08-06 21:59:25 +0000 | [diff] [blame] | 721 | #endif |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 722 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 723 | case 't': |
Damien Miller | 21771e2 | 2011-05-15 08:45:50 +1000 | [diff] [blame] | 724 | if (options.request_tty == REQUEST_TTY_YES) |
| 725 | options.request_tty = REQUEST_TTY_FORCE; |
| 726 | else |
| 727 | options.request_tty = REQUEST_TTY_YES; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 728 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 729 | case 'v': |
Darren Tucker | e98dfa3 | 2003-07-19 19:54:31 +1000 | [diff] [blame] | 730 | if (debug_flag == 0) { |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 731 | debug_flag = 1; |
| 732 | options.log_level = SYSLOG_LEVEL_DEBUG1; |
Darren Tucker | e98dfa3 | 2003-07-19 19:54:31 +1000 | [diff] [blame] | 733 | } else { |
| 734 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) |
| 735 | options.log_level++; |
Darren Tucker | e98dfa3 | 2003-07-19 19:54:31 +1000 | [diff] [blame] | 736 | } |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 737 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 738 | case 'V': |
Damien Miller | 0c889cd | 2004-03-22 09:36:00 +1100 | [diff] [blame] | 739 | fprintf(stderr, "%s, %s\n", |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 740 | SSH_RELEASE, |
| 741 | #ifdef WITH_OPENSSL |
| 742 | SSLeay_version(SSLEAY_VERSION) |
| 743 | #else |
| 744 | "without OpenSSL" |
| 745 | #endif |
| 746 | ); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 747 | if (opt == 'V') |
| 748 | exit(0); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 749 | break; |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 750 | case 'w': |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 751 | if (options.tun_open == -1) |
| 752 | options.tun_open = SSH_TUNMODE_DEFAULT; |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 753 | options.tun_local = a2tun(optarg, &options.tun_remote); |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 754 | if (options.tun_local == SSH_TUNID_ERR) { |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 755 | fprintf(stderr, |
| 756 | "Bad tun device '%s'\n", optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 757 | exit(255); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 758 | } |
| 759 | break; |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 760 | case 'W': |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 761 | if (stdio_forward_host != NULL) |
| 762 | fatal("stdio forward already specified"); |
| 763 | if (muxclient_command != 0) |
| 764 | fatal("Cannot specify stdio forward with -O"); |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 765 | if (parse_forward(&fwd, optarg, 1, 0)) { |
| 766 | stdio_forward_host = fwd.listen_host; |
| 767 | stdio_forward_port = fwd.listen_port; |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 768 | free(fwd.connect_host); |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 769 | } else { |
| 770 | fprintf(stderr, |
| 771 | "Bad stdio forwarding specification '%s'\n", |
| 772 | optarg); |
| 773 | exit(255); |
| 774 | } |
Damien Miller | 21771e2 | 2011-05-15 08:45:50 +1000 | [diff] [blame] | 775 | options.request_tty = REQUEST_TTY_NO; |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 776 | no_shell_flag = 1; |
| 777 | options.clear_forwardings = 1; |
| 778 | options.exit_on_forward_failure = 1; |
| 779 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 780 | case 'q': |
| 781 | options.log_level = SYSLOG_LEVEL_QUIET; |
| 782 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 783 | case 'e': |
| 784 | if (optarg[0] == '^' && optarg[2] == 0 && |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 785 | (u_char) optarg[1] >= 64 && |
| 786 | (u_char) optarg[1] < 128) |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 787 | options.escape_char = (u_char) optarg[1] & 31; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 788 | else if (strlen(optarg) == 1) |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 789 | options.escape_char = (u_char) optarg[0]; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 790 | else if (strcmp(optarg, "none") == 0) |
Ben Lindstrom | 2b1f71b | 2001-06-05 20:32:21 +0000 | [diff] [blame] | 791 | options.escape_char = SSH_ESCAPECHAR_NONE; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 792 | else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 793 | fprintf(stderr, "Bad escape character '%s'.\n", |
| 794 | optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 795 | exit(255); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 796 | } |
| 797 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 798 | case 'c': |
djm@openbsd.org | f9eca24 | 2015-07-30 00:01:34 +0000 | [diff] [blame] | 799 | if (ciphers_valid(*optarg == '+' ? |
| 800 | optarg + 1 : optarg)) { |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 801 | /* SSH2 only */ |
dtucker@openbsd.org | 4f7cc2f | 2015-09-04 08:21:47 +0000 | [diff] [blame^] | 802 | free(options.ciphers); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 803 | options.ciphers = xstrdup(optarg); |
Darren Tucker | 5cb30ad | 2004-08-12 22:40:24 +1000 | [diff] [blame] | 804 | options.cipher = SSH_CIPHER_INVALID; |
djm@openbsd.org | f9eca24 | 2015-07-30 00:01:34 +0000 | [diff] [blame] | 805 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 806 | } |
djm@openbsd.org | f9eca24 | 2015-07-30 00:01:34 +0000 | [diff] [blame] | 807 | /* SSH1 only */ |
| 808 | options.cipher = cipher_number(optarg); |
| 809 | if (options.cipher == -1) { |
| 810 | fprintf(stderr, "Unknown cipher type '%s'\n", |
| 811 | optarg); |
| 812 | exit(255); |
| 813 | } |
| 814 | if (options.cipher == SSH_CIPHER_3DES) |
| 815 | options.ciphers = xstrdup("3des-cbc"); |
| 816 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
| 817 | options.ciphers = xstrdup("blowfish-cbc"); |
| 818 | else |
| 819 | options.ciphers = xstrdup(KEX_CLIENT_ENCRYPT); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 820 | break; |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 821 | case 'm': |
dtucker@openbsd.org | 4f7cc2f | 2015-09-04 08:21:47 +0000 | [diff] [blame^] | 822 | if (mac_valid(optarg)) { |
| 823 | free(options.macs); |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 824 | options.macs = xstrdup(optarg); |
dtucker@openbsd.org | 4f7cc2f | 2015-09-04 08:21:47 +0000 | [diff] [blame^] | 825 | } else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 826 | fprintf(stderr, "Unknown mac type '%s'\n", |
| 827 | optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 828 | exit(255); |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 829 | } |
| 830 | break; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 831 | case 'M': |
Damien Miller | d14b1e7 | 2005-06-16 13:19:41 +1000 | [diff] [blame] | 832 | if (options.control_master == SSHCTL_MASTER_YES) |
| 833 | options.control_master = SSHCTL_MASTER_ASK; |
| 834 | else |
| 835 | options.control_master = SSHCTL_MASTER_YES; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 836 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 837 | case 'p': |
Ben Lindstrom | 19066a1 | 2001-04-12 23:39:26 +0000 | [diff] [blame] | 838 | options.port = a2port(optarg); |
Damien Miller | 3dc71ad | 2009-01-28 16:31:22 +1100 | [diff] [blame] | 839 | if (options.port <= 0) { |
Ben Lindstrom | 146edb9 | 2001-04-11 23:06:28 +0000 | [diff] [blame] | 840 | fprintf(stderr, "Bad port '%s'\n", optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 841 | exit(255); |
Ben Lindstrom | 146edb9 | 2001-04-11 23:06:28 +0000 | [diff] [blame] | 842 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 843 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 844 | case 'l': |
| 845 | options.user = optarg; |
| 846 | break; |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 847 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 848 | case 'L': |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 849 | if (parse_forward(&fwd, optarg, 0, 0)) |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 850 | add_local_forward(&options, &fwd); |
| 851 | else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 852 | fprintf(stderr, |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 853 | "Bad local forwarding specification '%s'\n", |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 854 | optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 855 | exit(255); |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 856 | } |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 857 | break; |
| 858 | |
| 859 | case 'R': |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 860 | if (parse_forward(&fwd, optarg, 0, 1)) { |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 861 | add_remote_forward(&options, &fwd); |
| 862 | } else { |
| 863 | fprintf(stderr, |
| 864 | "Bad remote forwarding specification " |
| 865 | "'%s'\n", optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 866 | exit(255); |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 867 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 868 | break; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 869 | |
| 870 | case 'D': |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 871 | if (parse_forward(&fwd, optarg, 1, 0)) { |
Damien Miller | a699d95 | 2008-11-03 19:27:34 +1100 | [diff] [blame] | 872 | add_local_forward(&options, &fwd); |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 873 | } else { |
Damien Miller | a699d95 | 2008-11-03 19:27:34 +1100 | [diff] [blame] | 874 | fprintf(stderr, |
| 875 | "Bad dynamic forwarding specification " |
| 876 | "'%s'\n", optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 877 | exit(255); |
Ben Lindstrom | 146edb9 | 2001-04-11 23:06:28 +0000 | [diff] [blame] | 878 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 879 | break; |
| 880 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 881 | case 'C': |
| 882 | options.compression = 1; |
| 883 | break; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 884 | case 'N': |
| 885 | no_shell_flag = 1; |
Damien Miller | 21771e2 | 2011-05-15 08:45:50 +1000 | [diff] [blame] | 886 | options.request_tty = REQUEST_TTY_NO; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 887 | break; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 888 | case 'T': |
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 | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 891 | case 'o': |
Damien Miller | 9836cf8 | 2003-12-17 16:30:06 +1100 | [diff] [blame] | 892 | line = xstrdup(optarg); |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 893 | if (process_config_line(&options, pw, |
| 894 | host ? host : "", host ? host : "", line, |
| 895 | "command-line", 0, NULL, SSHCONF_USERCONF) != 0) |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 896 | exit(255); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 897 | free(line); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 898 | break; |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 899 | case 's': |
| 900 | subsystem_flag = 1; |
| 901 | break; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 902 | case 'S': |
| 903 | if (options.control_path != NULL) |
| 904 | free(options.control_path); |
| 905 | options.control_path = xstrdup(optarg); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 906 | break; |
Ben Lindstrom | e0f8804 | 2001-04-30 13:06:24 +0000 | [diff] [blame] | 907 | case 'b': |
| 908 | options.bind_address = optarg; |
| 909 | break; |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 910 | case 'F': |
| 911 | config = optarg; |
| 912 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 913 | default: |
| 914 | usage(); |
| 915 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 916 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 917 | |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 918 | ac -= optind; |
| 919 | av += optind; |
| 920 | |
Darren Tucker | b8c884a | 2010-01-08 18:53:43 +1100 | [diff] [blame] | 921 | if (ac > 0 && !host) { |
Ben Lindstrom | c276c12 | 2002-12-23 02:14:51 +0000 | [diff] [blame] | 922 | if (strrchr(*av, '@')) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 923 | p = xstrdup(*av); |
Ben Lindstrom | c276c12 | 2002-12-23 02:14:51 +0000 | [diff] [blame] | 924 | cp = strrchr(p, '@'); |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 925 | if (cp == NULL || cp == p) |
| 926 | usage(); |
| 927 | options.user = p; |
| 928 | *cp = '\0'; |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 929 | host = xstrdup(++cp); |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 930 | } else |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 931 | host = xstrdup(*av); |
Ben Lindstrom | b9fa691 | 2002-12-23 02:24:54 +0000 | [diff] [blame] | 932 | if (ac > 1) { |
| 933 | optind = optreset = 1; |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 934 | goto again; |
| 935 | } |
Ben Lindstrom | b9fa691 | 2002-12-23 02:24:54 +0000 | [diff] [blame] | 936 | ac--, av++; |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 937 | } |
| 938 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 939 | /* Check that we got a host name. */ |
| 940 | if (!host) |
| 941 | usage(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 942 | |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 943 | host_arg = xstrdup(host); |
| 944 | |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 945 | #ifdef WITH_OPENSSL |
Damien Miller | 4314c2b | 2010-09-10 11:12:09 +1000 | [diff] [blame] | 946 | OpenSSL_add_all_algorithms(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 947 | ERR_load_crypto_strings(); |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 948 | #endif |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 949 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 950 | /* Initialize the command to execute on remote host. */ |
| 951 | buffer_init(&command); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 952 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 953 | /* |
| 954 | * Save the command to execute on the remote host in a buffer. There |
| 955 | * is no limit on the length of the command, except by the maximum |
| 956 | * packet size. Also sets the tty flag if there is no command. |
| 957 | */ |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 958 | if (!ac) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 959 | /* No command specified - execute shell on a tty. */ |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 960 | if (subsystem_flag) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 961 | fprintf(stderr, |
| 962 | "You must specify a subsystem to invoke.\n"); |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 963 | usage(); |
| 964 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 965 | } else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 966 | /* A command has been specified. Store it into the buffer. */ |
| 967 | for (i = 0; i < ac; i++) { |
| 968 | if (i) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 969 | buffer_append(&command, " ", 1); |
| 970 | buffer_append(&command, av[i], strlen(av[i])); |
| 971 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 972 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 973 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 974 | /* Cannot fork to background if no command. */ |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 975 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && |
| 976 | !no_shell_flag) |
| 977 | fatal("Cannot fork into background without a command " |
| 978 | "to execute."); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 979 | |
Ben Lindstrom | 8a432f5 | 2001-03-05 07:24:46 +0000 | [diff] [blame] | 980 | /* |
| 981 | * Initialize "log" output. Since we are the client all output |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 982 | * goes to stderr unless otherwise specified by -y or -E. |
Ben Lindstrom | 8a432f5 | 2001-03-05 07:24:46 +0000 | [diff] [blame] | 983 | */ |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 984 | if (use_syslog && logfile != NULL) |
| 985 | fatal("Can't specify both -y and -E"); |
dtucker@openbsd.org | 4f7cc2f | 2015-09-04 08:21:47 +0000 | [diff] [blame^] | 986 | if (logfile != NULL) |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 987 | log_redirect_stderr_to(logfile); |
Darren Tucker | 72efd74 | 2009-06-21 17:48:00 +1000 | [diff] [blame] | 988 | log_init(argv0, |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 989 | options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
Damien Miller | e272a5b | 2008-11-03 19:22:37 +1100 | [diff] [blame] | 990 | SYSLOG_FACILITY_USER, !use_syslog); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 991 | |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 992 | if (debug_flag) |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 993 | logit("%s, %s", SSH_RELEASE, |
| 994 | #ifdef WITH_OPENSSL |
| 995 | SSLeay_version(SSLEAY_VERSION) |
| 996 | #else |
| 997 | "without OpenSSL" |
| 998 | #endif |
| 999 | ); |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 1000 | |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 1001 | /* Parse the configuration files */ |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 1002 | process_config_files(host_arg, pw, 0); |
Ben Lindstrom | 83f07d1 | 2001-10-03 17:22:29 +0000 | [diff] [blame] | 1003 | |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 1004 | /* Hostname canonicalisation needs a few options filled. */ |
| 1005 | fill_default_options_for_canonicalization(&options); |
| 1006 | |
| 1007 | /* If the user has replaced the hostname then take it into use now */ |
| 1008 | if (options.hostname != NULL) { |
| 1009 | /* NB. Please keep in sync with readconf.c:match_cfg_line() */ |
| 1010 | cp = percent_expand(options.hostname, |
| 1011 | "h", host, (char *)NULL); |
| 1012 | free(host); |
| 1013 | host = cp; |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 1014 | free(options.hostname); |
| 1015 | options.hostname = xstrdup(host); |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 1016 | } |
| 1017 | |
| 1018 | /* If canonicalization requested then try to apply it */ |
| 1019 | lowercase(host); |
| 1020 | if (options.canonicalize_hostname != SSH_CANONICALISE_NO) |
| 1021 | addrs = resolve_canonicalize(&host, options.port); |
| 1022 | |
| 1023 | /* |
Damien Miller | 08b57c6 | 2014-02-27 10:17:13 +1100 | [diff] [blame] | 1024 | * If CanonicalizePermittedCNAMEs have been specified but |
| 1025 | * other canonicalization did not happen (by not being requested |
| 1026 | * or by failing with fallback) then the hostname may still be changed |
| 1027 | * as a result of CNAME following. |
| 1028 | * |
| 1029 | * Try to resolve the bare hostname name using the system resolver's |
| 1030 | * usual search rules and then apply the CNAME follow rules. |
| 1031 | * |
| 1032 | * Skip the lookup if a ProxyCommand is being used unless the user |
| 1033 | * has specifically requested canonicalisation for this case via |
| 1034 | * CanonicalizeHostname=always |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 1035 | */ |
Damien Miller | 08b57c6 | 2014-02-27 10:17:13 +1100 | [diff] [blame] | 1036 | if (addrs == NULL && options.num_permitted_cnames != 0 && |
| 1037 | (option_clear_or_none(options.proxy_command) || |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 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 |
| 1046 | check_follow_cname(&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 | |
Damien Miller | 13f97b2 | 2014-02-24 15:57:55 +1100 | [diff] [blame] | 1071 | if (options.port == 0) |
| 1072 | options.port = default_ssh_port(); |
Darren Tucker | 0a4f04b | 2003-07-03 20:37:47 +1000 | [diff] [blame] | 1073 | channel_set_af(options.address_family); |
| 1074 | |
Damien Miller | e9fc72e | 2013-10-15 12:14:12 +1100 | [diff] [blame] | 1075 | /* Tidy and check options */ |
| 1076 | if (options.host_key_alias != NULL) |
| 1077 | lowercase(options.host_key_alias); |
| 1078 | if (options.proxy_command != NULL && |
| 1079 | strcmp(options.proxy_command, "-") == 0 && |
| 1080 | options.proxy_use_fdpass) |
| 1081 | fatal("ProxyCommand=- and ProxyUseFDPass are incompatible"); |
djm@openbsd.org | 44732de | 2015-02-20 22:17:21 +0000 | [diff] [blame] | 1082 | if (options.control_persist && |
| 1083 | options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) { |
| 1084 | debug("UpdateHostKeys=ask is incompatible with ControlPersist; " |
| 1085 | "disabling"); |
| 1086 | options.update_hostkeys = 0; |
| 1087 | } |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 1088 | #ifndef HAVE_CYGWIN |
| 1089 | if (original_effective_uid != 0) |
| 1090 | options.use_privileged_port = 0; |
| 1091 | #endif |
Damien Miller | e9fc72e | 2013-10-15 12:14:12 +1100 | [diff] [blame] | 1092 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1093 | /* reinit */ |
Darren Tucker | 72efd74 | 2009-06-21 17:48:00 +1000 | [diff] [blame] | 1094 | log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1095 | |
Damien Miller | fff9f09 | 2012-07-06 13:45:01 +1000 | [diff] [blame] | 1096 | if (options.request_tty == REQUEST_TTY_YES || |
| 1097 | options.request_tty == REQUEST_TTY_FORCE) |
| 1098 | tty_flag = 1; |
| 1099 | |
| 1100 | /* Allocate a tty by default if no command specified. */ |
| 1101 | if (buffer_len(&command) == 0) |
| 1102 | tty_flag = options.request_tty != REQUEST_TTY_NO; |
| 1103 | |
| 1104 | /* Force no tty */ |
| 1105 | if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0) |
| 1106 | tty_flag = 0; |
| 1107 | /* Do not allocate a tty if stdin is not a tty. */ |
| 1108 | if ((!isatty(fileno(stdin)) || stdin_null_flag) && |
| 1109 | options.request_tty != REQUEST_TTY_FORCE) { |
| 1110 | if (tty_flag) |
| 1111 | logit("Pseudo-terminal will not be allocated because " |
| 1112 | "stdin is not a terminal."); |
| 1113 | tty_flag = 0; |
| 1114 | } |
| 1115 | |
Damien Miller | 60bc517 | 2001-03-19 09:38:15 +1100 | [diff] [blame] | 1116 | seed_rng(); |
| 1117 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1118 | if (options.user == NULL) |
| 1119 | options.user = xstrdup(pw->pw_name); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1120 | |
Damien Miller | dfc85fa | 2011-05-15 08:44:02 +1000 | [diff] [blame] | 1121 | if (gethostname(thishost, sizeof(thishost)) == -1) |
| 1122 | fatal("gethostname: %s", strerror(errno)); |
| 1123 | strlcpy(shorthost, thishost, sizeof(shorthost)); |
| 1124 | shorthost[strcspn(thishost, ".")] = '\0'; |
| 1125 | snprintf(portstr, sizeof(portstr), "%d", options.port); |
Darren Tucker | f6b01b7 | 2008-06-13 04:56:37 +1000 | [diff] [blame] | 1126 | |
Damien Miller | 9c38643 | 2014-07-03 21:27:46 +1000 | [diff] [blame] | 1127 | if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL || |
| 1128 | ssh_digest_update(md, thishost, strlen(thishost)) < 0 || |
| 1129 | ssh_digest_update(md, host, strlen(host)) < 0 || |
| 1130 | ssh_digest_update(md, portstr, strlen(portstr)) < 0 || |
| 1131 | ssh_digest_update(md, options.user, strlen(options.user)) < 0 || |
| 1132 | ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0) |
| 1133 | fatal("%s: mux digest failed", __func__); |
| 1134 | ssh_digest_free(md); |
| 1135 | conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1)); |
| 1136 | |
Damien Miller | dfc85fa | 2011-05-15 08:44:02 +1000 | [diff] [blame] | 1137 | if (options.local_command != NULL) { |
Darren Tucker | f6b01b7 | 2008-06-13 04:56:37 +1000 | [diff] [blame] | 1138 | debug3("expanding LocalCommand: %s", options.local_command); |
| 1139 | cp = options.local_command; |
Damien Miller | 9c38643 | 2014-07-03 21:27:46 +1000 | [diff] [blame] | 1140 | options.local_command = percent_expand(cp, |
| 1141 | "C", conn_hash_hex, |
| 1142 | "L", shorthost, |
| 1143 | "d", pw->pw_dir, |
| 1144 | "h", host, |
| 1145 | "l", thishost, |
| 1146 | "n", host_arg, |
| 1147 | "p", portstr, |
| 1148 | "r", options.user, |
| 1149 | "u", pw->pw_name, |
Damien Miller | dfc85fa | 2011-05-15 08:44:02 +1000 | [diff] [blame] | 1150 | (char *)NULL); |
Darren Tucker | f6b01b7 | 2008-06-13 04:56:37 +1000 | [diff] [blame] | 1151 | debug3("expanded LocalCommand: %s", options.local_command); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1152 | free(cp); |
Darren Tucker | f6b01b7 | 2008-06-13 04:56:37 +1000 | [diff] [blame] | 1153 | } |
| 1154 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1155 | if (options.control_path != NULL) { |
Damien Miller | 6476cad | 2005-06-16 13:18:34 +1000 | [diff] [blame] | 1156 | cp = tilde_expand_filename(options.control_path, |
| 1157 | original_real_uid); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1158 | free(options.control_path); |
Damien Miller | 9c38643 | 2014-07-03 21:27:46 +1000 | [diff] [blame] | 1159 | options.control_path = percent_expand(cp, |
| 1160 | "C", conn_hash_hex, |
| 1161 | "L", shorthost, |
| 1162 | "h", host, |
| 1163 | "l", thishost, |
| 1164 | "n", host_arg, |
| 1165 | "p", portstr, |
| 1166 | "r", options.user, |
| 1167 | "u", pw->pw_name, |
Damien Miller | dfc85fa | 2011-05-15 08:44:02 +1000 | [diff] [blame] | 1168 | (char *)NULL); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1169 | free(cp); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1170 | } |
Damien Miller | 9c38643 | 2014-07-03 21:27:46 +1000 | [diff] [blame] | 1171 | free(conn_hash_hex); |
| 1172 | |
djm@openbsd.org | 957fbce | 2014-10-08 22:20:25 +0000 | [diff] [blame] | 1173 | if (config_test) { |
| 1174 | dump_client_config(&options, host); |
| 1175 | exit(0); |
| 1176 | } |
| 1177 | |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 1178 | if (muxclient_command != 0 && options.control_path == NULL) |
Darren Tucker | 0814d31 | 2005-06-01 23:08:51 +1000 | [diff] [blame] | 1179 | fatal("No ControlPath specified for \"-O\" command"); |
Damien Miller | d14b1e7 | 2005-06-16 13:19:41 +1000 | [diff] [blame] | 1180 | if (options.control_path != NULL) |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 1181 | muxclient(options.control_path); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1182 | |
Damien Miller | 08b57c6 | 2014-02-27 10:17:13 +1100 | [diff] [blame] | 1183 | /* |
| 1184 | * If hostname canonicalisation was not enabled, then we may not |
| 1185 | * have yet resolved the hostname. Do so now. |
| 1186 | */ |
| 1187 | if (addrs == NULL && options.proxy_command == NULL) { |
djm@openbsd.org | a85768a | 2015-09-04 04:56:09 +0000 | [diff] [blame] | 1188 | debug2("resolving \"%s\" port %d", host, options.port); |
Damien Miller | 08b57c6 | 2014-02-27 10:17:13 +1100 | [diff] [blame] | 1189 | if ((addrs = resolve_host(host, options.port, 1, |
| 1190 | cname, sizeof(cname))) == NULL) |
| 1191 | cleanup_exit(255); /* resolve_host logs the error */ |
| 1192 | } |
| 1193 | |
Damien Miller | 67bd062 | 2007-09-17 12:06:57 +1000 | [diff] [blame] | 1194 | timeout_ms = options.connection_timeout * 1000; |
| 1195 | |
Kevin Steves | fcec7f8 | 2000-12-15 19:55:48 +0000 | [diff] [blame] | 1196 | /* Open a connection to the remote host. */ |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 1197 | if (ssh_connect(host, addrs, &hostaddr, options.port, |
| 1198 | options.address_family, options.connection_attempts, |
| 1199 | &timeout_ms, options.tcp_keep_alive, |
| 1200 | options.use_privileged_port) != 0) |
| 1201 | exit(255); |
| 1202 | |
Damien Miller | 28631ce | 2013-10-26 10:07:56 +1100 | [diff] [blame] | 1203 | if (addrs != NULL) |
| 1204 | freeaddrinfo(addrs); |
| 1205 | |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 1206 | packet_set_timeout(options.server_alive_interval, |
| 1207 | options.server_alive_count_max); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1208 | |
Damien Miller | 67bd062 | 2007-09-17 12:06:57 +1000 | [diff] [blame] | 1209 | if (timeout_ms > 0) |
| 1210 | debug3("timeout: %d ms remain after connect", timeout_ms); |
| 1211 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1212 | /* |
| 1213 | * If we successfully made the connection, load the host private key |
| 1214 | * in case we will need it later for combined rsa-rhosts |
| 1215 | * authentication. This must be done before releasing extra |
| 1216 | * privileges, because the file is only readable by root. |
Ben Lindstrom | 9e5bb57 | 2002-06-06 19:58:27 +0000 | [diff] [blame] | 1217 | * If we cannot access the private keys, load the public keys |
| 1218 | * instead and try to execute the ssh-keysign helper instead. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1219 | */ |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1220 | sensitive_data.nkeys = 0; |
| 1221 | sensitive_data.keys = NULL; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1222 | sensitive_data.external_keysign = 0; |
Ben Lindstrom | 2415757 | 2002-06-12 16:09:39 +0000 | [diff] [blame] | 1223 | if (options.rhosts_rsa_authentication || |
| 1224 | options.hostbased_authentication) { |
Damien Miller | 0fa47cf | 2013-12-29 17:53:39 +1100 | [diff] [blame] | 1225 | sensitive_data.nkeys = 9; |
Damien Miller | ddd63ab | 2006-03-31 23:10:51 +1100 | [diff] [blame] | 1226 | sensitive_data.keys = xcalloc(sensitive_data.nkeys, |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 1227 | sizeof(Key)); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1228 | for (i = 0; i < sensitive_data.nkeys; i++) |
| 1229 | sensitive_data.keys[i] = NULL; |
Ben Lindstrom | f9c4884 | 2002-06-11 16:37:51 +0000 | [diff] [blame] | 1230 | |
| 1231 | PRIV_START; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1232 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
Darren Tucker | 232b76f | 2006-05-06 17:41:51 +1000 | [diff] [blame] | 1233 | _PATH_HOST_KEY_FILE, "", NULL, NULL); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1234 | #ifdef OPENSSL_HAS_ECC |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1235 | sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA, |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 1236 | _PATH_HOST_ECDSA_KEY_FILE, "", NULL); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1237 | #endif |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1238 | sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519, |
| 1239 | _PATH_HOST_ED25519_KEY_FILE, "", NULL); |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 1240 | sensitive_data.keys[3] = key_load_private_cert(KEY_RSA, |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 1241 | _PATH_HOST_RSA_KEY_FILE, "", NULL); |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1242 | sensitive_data.keys[4] = key_load_private_cert(KEY_DSA, |
| 1243 | _PATH_HOST_DSA_KEY_FILE, "", NULL); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1244 | #ifdef OPENSSL_HAS_ECC |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1245 | sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA, |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 1246 | _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1247 | #endif |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1248 | sensitive_data.keys[6] = key_load_private_type(KEY_ED25519, |
| 1249 | _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL); |
Damien Miller | 0fa47cf | 2013-12-29 17:53:39 +1100 | [diff] [blame] | 1250 | sensitive_data.keys[7] = key_load_private_type(KEY_RSA, |
Darren Tucker | 232b76f | 2006-05-06 17:41:51 +1000 | [diff] [blame] | 1251 | _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL); |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1252 | sensitive_data.keys[8] = key_load_private_type(KEY_DSA, |
| 1253 | _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL); |
Ben Lindstrom | f9c4884 | 2002-06-11 16:37:51 +0000 | [diff] [blame] | 1254 | PRIV_END; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1255 | |
Ben Lindstrom | 5d35a2f | 2002-07-04 00:19:40 +0000 | [diff] [blame] | 1256 | if (options.hostbased_authentication == 1 && |
| 1257 | sensitive_data.keys[0] == NULL && |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 1258 | sensitive_data.keys[5] == NULL && |
Damien Miller | 5be9d9e | 2013-12-07 11:24:01 +1100 | [diff] [blame] | 1259 | sensitive_data.keys[6] == NULL && |
Damien Miller | 0fa47cf | 2013-12-29 17:53:39 +1100 | [diff] [blame] | 1260 | sensitive_data.keys[7] == NULL && |
| 1261 | sensitive_data.keys[8] == NULL) { |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1262 | #ifdef OPENSSL_HAS_ECC |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1263 | sensitive_data.keys[1] = key_load_cert( |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 1264 | _PATH_HOST_ECDSA_KEY_FILE); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1265 | #endif |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1266 | sensitive_data.keys[2] = key_load_cert( |
| 1267 | _PATH_HOST_ED25519_KEY_FILE); |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 1268 | sensitive_data.keys[3] = key_load_cert( |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 1269 | _PATH_HOST_RSA_KEY_FILE); |
Damien Miller | 0fa47cf | 2013-12-29 17:53:39 +1100 | [diff] [blame] | 1270 | sensitive_data.keys[4] = key_load_cert( |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1271 | _PATH_HOST_DSA_KEY_FILE); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1272 | #ifdef OPENSSL_HAS_ECC |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1273 | sensitive_data.keys[5] = key_load_public( |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 1274 | _PATH_HOST_ECDSA_KEY_FILE, NULL); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 1275 | #endif |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1276 | sensitive_data.keys[6] = key_load_public( |
| 1277 | _PATH_HOST_ED25519_KEY_FILE, NULL); |
Damien Miller | 5be9d9e | 2013-12-07 11:24:01 +1100 | [diff] [blame] | 1278 | sensitive_data.keys[7] = key_load_public( |
Damien Miller | 0fa47cf | 2013-12-29 17:53:39 +1100 | [diff] [blame] | 1279 | _PATH_HOST_RSA_KEY_FILE, NULL); |
| 1280 | sensitive_data.keys[8] = key_load_public( |
djm@openbsd.org | ab24ab8 | 2015-01-08 10:15:45 +0000 | [diff] [blame] | 1281 | _PATH_HOST_DSA_KEY_FILE, NULL); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1282 | sensitive_data.external_keysign = 1; |
| 1283 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1284 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1285 | /* |
| 1286 | * Get rid of any extra privileges that we may have. We will no |
| 1287 | * longer need them. Also, extra privileges could make it very hard |
| 1288 | * to read identity files and other non-world-readable files from the |
| 1289 | * user's home directory if it happens to be on a NFS volume where |
| 1290 | * root is mapped to nobody. |
| 1291 | */ |
Darren Tucker | 25f60a7 | 2004-08-15 17:23:34 +1000 | [diff] [blame] | 1292 | if (original_effective_uid == 0) { |
| 1293 | PRIV_START; |
| 1294 | permanently_set_uid(pw); |
| 1295 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1296 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1297 | /* |
| 1298 | * Now that we are back to our own permissions, create ~/.ssh |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 1299 | * directory if it doesn't already exist. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1300 | */ |
Darren Tucker | 45c66d7 | 2011-11-04 10:50:40 +1100 | [diff] [blame] | 1301 | if (config == NULL) { |
| 1302 | r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir, |
| 1303 | strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
| 1304 | if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) { |
Darren Tucker | 8ccb739 | 2010-09-10 12:28:24 +1000 | [diff] [blame] | 1305 | #ifdef WITH_SELINUX |
Darren Tucker | 45c66d7 | 2011-11-04 10:50:40 +1100 | [diff] [blame] | 1306 | ssh_selinux_setfscreatecon(buf); |
Darren Tucker | 8ccb739 | 2010-09-10 12:28:24 +1000 | [diff] [blame] | 1307 | #endif |
Darren Tucker | 45c66d7 | 2011-11-04 10:50:40 +1100 | [diff] [blame] | 1308 | if (mkdir(buf, 0700) < 0) |
| 1309 | error("Could not create directory '%.200s'.", |
| 1310 | buf); |
Darren Tucker | 8ccb739 | 2010-09-10 12:28:24 +1000 | [diff] [blame] | 1311 | #ifdef WITH_SELINUX |
Darren Tucker | 45c66d7 | 2011-11-04 10:50:40 +1100 | [diff] [blame] | 1312 | ssh_selinux_setfscreatecon(NULL); |
Darren Tucker | 8ccb739 | 2010-09-10 12:28:24 +1000 | [diff] [blame] | 1313 | #endif |
Darren Tucker | 45c66d7 | 2011-11-04 10:50:40 +1100 | [diff] [blame] | 1314 | } |
Darren Tucker | 8ccb739 | 2010-09-10 12:28:24 +1000 | [diff] [blame] | 1315 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1316 | /* load options.identity_files */ |
| 1317 | load_public_identity_files(); |
| 1318 | |
| 1319 | /* Expand ~ in known host file names. */ |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 1320 | tilde_expand_paths(options.system_hostfiles, |
| 1321 | options.num_system_hostfiles); |
| 1322 | tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1323 | |
Damien Miller | 07cd589 | 2001-11-12 10:52:03 +1100 | [diff] [blame] | 1324 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
Damien Miller | 857b02e | 2010-09-24 22:02:56 +1000 | [diff] [blame] | 1325 | signal(SIGCHLD, main_sigchld_handler); |
Damien Miller | 07cd589 | 2001-11-12 10:52:03 +1100 | [diff] [blame] | 1326 | |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1327 | /* Log into the remote system. Never returns if the login fails. */ |
Damien Miller | 67bd062 | 2007-09-17 12:06:57 +1000 | [diff] [blame] | 1328 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 1329 | options.port, pw, timeout_ms); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1330 | |
Damien Miller | 383ffe6 | 2010-06-26 10:02:03 +1000 | [diff] [blame] | 1331 | if (packet_connection_is_on_socket()) { |
| 1332 | verbose("Authenticated to %s ([%s]:%d).", host, |
| 1333 | get_remote_ipaddr(), get_remote_port()); |
| 1334 | } else { |
| 1335 | verbose("Authenticated to %s (via proxy).", host); |
| 1336 | } |
| 1337 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1338 | /* We no longer need the private host keys. Clear them now. */ |
| 1339 | if (sensitive_data.nkeys != 0) { |
| 1340 | for (i = 0; i < sensitive_data.nkeys; i++) { |
| 1341 | if (sensitive_data.keys[i] != NULL) { |
| 1342 | /* Destroys contents safely */ |
| 1343 | debug3("clear hostkey %d", i); |
| 1344 | key_free(sensitive_data.keys[i]); |
| 1345 | sensitive_data.keys[i] = NULL; |
| 1346 | } |
| 1347 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1348 | free(sensitive_data.keys); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1349 | } |
Ben Lindstrom | a6c8a8d | 2001-08-06 21:42:00 +0000 | [diff] [blame] | 1350 | for (i = 0; i < options.num_identity_files; i++) { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1351 | free(options.identity_files[i]); |
| 1352 | options.identity_files[i] = NULL; |
Ben Lindstrom | a6c8a8d | 2001-08-06 21:42:00 +0000 | [diff] [blame] | 1353 | if (options.identity_keys[i]) { |
| 1354 | key_free(options.identity_keys[i]); |
| 1355 | options.identity_keys[i] = NULL; |
| 1356 | } |
| 1357 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1358 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1359 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
| 1360 | packet_close(); |
Damien Miller | 8c4e18a | 2002-09-19 12:05:02 +1000 | [diff] [blame] | 1361 | |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 1362 | if (options.control_path != NULL && muxserver_sock != -1) |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1363 | unlink(options.control_path); |
| 1364 | |
Damien Miller | a41ccca | 2010-10-07 22:07:32 +1100 | [diff] [blame] | 1365 | /* Kill ProxyCommand if it is running. */ |
| 1366 | ssh_kill_proxy_command(); |
Damien Miller | 8c4e18a | 2002-09-19 12:05:02 +1000 | [diff] [blame] | 1367 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1368 | return exit_status; |
| 1369 | } |
| 1370 | |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1371 | static void |
| 1372 | control_persist_detach(void) |
| 1373 | { |
| 1374 | pid_t pid; |
Damien Miller | 00d9ae2 | 2010-08-17 01:59:31 +1000 | [diff] [blame] | 1375 | int devnull; |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1376 | |
| 1377 | debug("%s: backgrounding master process", __func__); |
| 1378 | |
| 1379 | /* |
| 1380 | * master (current process) into the background, and make the |
| 1381 | * foreground process a client of the backgrounded master. |
| 1382 | */ |
| 1383 | switch ((pid = fork())) { |
| 1384 | case -1: |
| 1385 | fatal("%s: fork: %s", __func__, strerror(errno)); |
| 1386 | case 0: |
| 1387 | /* Child: master process continues mainloop */ |
| 1388 | break; |
| 1389 | default: |
| 1390 | /* Parent: set up mux slave to connect to backgrounded master */ |
| 1391 | debug2("%s: background process is %ld", __func__, (long)pid); |
| 1392 | stdin_null_flag = ostdin_null_flag; |
Damien Miller | 21771e2 | 2011-05-15 08:45:50 +1000 | [diff] [blame] | 1393 | options.request_tty = orequest_tty; |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1394 | tty_flag = otty_flag; |
| 1395 | close(muxserver_sock); |
| 1396 | muxserver_sock = -1; |
Damien Miller | 5929c52 | 2010-09-10 11:17:02 +1000 | [diff] [blame] | 1397 | options.control_master = SSHCTL_MASTER_NO; |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1398 | muxclient(options.control_path); |
| 1399 | /* muxclient() doesn't return on success. */ |
| 1400 | fatal("Failed to connect to new control master"); |
| 1401 | } |
Damien Miller | 00d9ae2 | 2010-08-17 01:59:31 +1000 | [diff] [blame] | 1402 | if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) { |
| 1403 | error("%s: open(\"/dev/null\"): %s", __func__, |
| 1404 | strerror(errno)); |
| 1405 | } else { |
| 1406 | if (dup2(devnull, STDIN_FILENO) == -1 || |
| 1407 | dup2(devnull, STDOUT_FILENO) == -1) |
| 1408 | error("%s: dup2: %s", __func__, strerror(errno)); |
| 1409 | if (devnull > STDERR_FILENO) |
| 1410 | close(devnull); |
| 1411 | } |
Damien Miller | 98e27dc | 2013-07-25 11:55:52 +1000 | [diff] [blame] | 1412 | daemon(1, 1); |
Damien Miller | ea2c1a4 | 2011-06-03 12:10:22 +1000 | [diff] [blame] | 1413 | setproctitle("%s [mux]", options.control_path); |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1414 | } |
| 1415 | |
| 1416 | /* Do fork() after authentication. Used by "ssh -f" */ |
| 1417 | static void |
| 1418 | fork_postauth(void) |
| 1419 | { |
| 1420 | if (need_controlpersist_detach) |
| 1421 | control_persist_detach(); |
| 1422 | debug("forking to background"); |
| 1423 | fork_after_authentication_flag = 0; |
| 1424 | if (daemon(1, 1) < 0) |
| 1425 | fatal("daemon() failed: %.200s", strerror(errno)); |
| 1426 | } |
| 1427 | |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1428 | /* Callback for remote forward global requests */ |
| 1429 | static void |
| 1430 | ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt) |
| 1431 | { |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1432 | struct Forward *rfwd = (struct Forward *)ctxt; |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1433 | |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 1434 | /* XXX verbose() on failure? */ |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 1435 | debug("remote forward %s for: listen %s%s%d, connect %s:%d", |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1436 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1437 | rfwd->listen_path ? rfwd->listen_path : |
| 1438 | rfwd->listen_host ? rfwd->listen_host : "", |
| 1439 | (rfwd->listen_path || rfwd->listen_host) ? ":" : "", |
| 1440 | rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path : |
| 1441 | rfwd->connect_host, rfwd->connect_port); |
| 1442 | if (rfwd->listen_path == NULL && rfwd->listen_port == 0) { |
Darren Tucker | 68afb8c | 2011-10-02 18:59:03 +1100 | [diff] [blame] | 1443 | if (type == SSH2_MSG_REQUEST_SUCCESS) { |
| 1444 | rfwd->allocated_port = packet_get_int(); |
| 1445 | logit("Allocated port %u for remote forward to %s:%d", |
| 1446 | rfwd->allocated_port, |
| 1447 | rfwd->connect_host, rfwd->connect_port); |
| 1448 | channel_update_permitted_opens(rfwd->handle, |
| 1449 | rfwd->allocated_port); |
| 1450 | } else { |
| 1451 | channel_update_permitted_opens(rfwd->handle, -1); |
| 1452 | } |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 1453 | } |
| 1454 | |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1455 | if (type == SSH2_MSG_REQUEST_FAILURE) { |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1456 | if (options.exit_on_forward_failure) { |
| 1457 | if (rfwd->listen_path != NULL) |
| 1458 | fatal("Error: remote port forwarding failed " |
| 1459 | "for listen path %s", rfwd->listen_path); |
| 1460 | else |
| 1461 | fatal("Error: remote port forwarding failed " |
| 1462 | "for listen port %d", rfwd->listen_port); |
| 1463 | } else { |
| 1464 | if (rfwd->listen_path != NULL) |
| 1465 | logit("Warning: remote port forwarding failed " |
| 1466 | "for listen path %s", rfwd->listen_path); |
| 1467 | else |
| 1468 | logit("Warning: remote port forwarding failed " |
| 1469 | "for listen port %d", rfwd->listen_port); |
| 1470 | } |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1471 | } |
Darren Tucker | 9a2a609 | 2008-07-04 12:53:50 +1000 | [diff] [blame] | 1472 | if (++remote_forward_confirms_received == options.num_remote_forwards) { |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1473 | debug("All remote forwarding requests processed"); |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1474 | if (fork_after_authentication_flag) |
| 1475 | fork_postauth(); |
Darren Tucker | 9a2a609 | 2008-07-04 12:53:50 +1000 | [diff] [blame] | 1476 | } |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1477 | } |
| 1478 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1479 | static void |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1480 | client_cleanup_stdio_fwd(int id, void *arg) |
| 1481 | { |
| 1482 | debug("stdio forwarding: done"); |
| 1483 | cleanup_exit(0); |
| 1484 | } |
| 1485 | |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1486 | static void |
Damien Miller | 357610d | 2014-07-18 15:04:10 +1000 | [diff] [blame] | 1487 | ssh_stdio_confirm(int id, int success, void *arg) |
| 1488 | { |
| 1489 | if (!success) |
| 1490 | fatal("stdio forwarding failed"); |
| 1491 | } |
| 1492 | |
| 1493 | static void |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1494 | ssh_init_stdio_forwarding(void) |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1495 | { |
| 1496 | Channel *c; |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1497 | int in, out; |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1498 | |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1499 | if (stdio_forward_host == NULL) |
| 1500 | return; |
Damien Miller | 386feab | 2013-10-15 12:14:49 +1100 | [diff] [blame] | 1501 | if (!compat20) |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1502 | fatal("stdio forwarding require Protocol 2"); |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1503 | |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1504 | debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port); |
| 1505 | |
| 1506 | if ((in = dup(STDIN_FILENO)) < 0 || |
| 1507 | (out = dup(STDOUT_FILENO)) < 0) |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1508 | fatal("channel_connect_stdio_fwd: dup() in/out failed"); |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1509 | if ((c = channel_connect_stdio_fwd(stdio_forward_host, |
| 1510 | stdio_forward_port, in, out)) == NULL) |
| 1511 | fatal("%s: channel_connect_stdio_fwd failed", __func__); |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1512 | channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0); |
Damien Miller | 357610d | 2014-07-18 15:04:10 +1000 | [diff] [blame] | 1513 | channel_register_open_confirm(c->self, ssh_stdio_confirm, NULL); |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1514 | } |
| 1515 | |
| 1516 | static void |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1517 | ssh_init_forwarding(void) |
| 1518 | { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1519 | int success = 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1520 | int i; |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1521 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1522 | /* Initiate local TCP/IP port forwardings. */ |
| 1523 | for (i = 0; i < options.num_local_forwards; i++) { |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1524 | debug("Local connections to %.200s:%d forwarded to remote " |
| 1525 | "address %.200s:%d", |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1526 | (options.local_forwards[i].listen_path != NULL) ? |
| 1527 | options.local_forwards[i].listen_path : |
Darren Tucker | 47eede7 | 2005-03-14 23:08:12 +1100 | [diff] [blame] | 1528 | (options.local_forwards[i].listen_host == NULL) ? |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1529 | (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") : |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1530 | options.local_forwards[i].listen_host, |
| 1531 | options.local_forwards[i].listen_port, |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1532 | (options.local_forwards[i].connect_path != NULL) ? |
| 1533 | options.local_forwards[i].connect_path : |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1534 | options.local_forwards[i].connect_host, |
| 1535 | options.local_forwards[i].connect_port); |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 1536 | success += channel_setup_local_fwd_listener( |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1537 | &options.local_forwards[i], &options.fwd_opts); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1538 | } |
Darren Tucker | e7d4b19 | 2006-07-12 22:17:10 +1000 | [diff] [blame] | 1539 | if (i > 0 && success != i && options.exit_on_forward_failure) |
| 1540 | fatal("Could not request local forwarding."); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1541 | if (i > 0 && success == 0) |
| 1542 | error("Could not request local forwarding."); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1543 | |
| 1544 | /* Initiate remote TCP/IP port forwardings. */ |
| 1545 | for (i = 0; i < options.num_remote_forwards; i++) { |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1546 | debug("Remote connections from %.200s:%d forwarded to " |
| 1547 | "local address %.200s:%d", |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1548 | (options.remote_forwards[i].listen_path != NULL) ? |
| 1549 | options.remote_forwards[i].listen_path : |
Damien Miller | 46d38de | 2005-07-17 17:02:09 +1000 | [diff] [blame] | 1550 | (options.remote_forwards[i].listen_host == NULL) ? |
Damien Miller | aa3bb10 | 2005-11-05 15:12:59 +1100 | [diff] [blame] | 1551 | "LOCALHOST" : options.remote_forwards[i].listen_host, |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1552 | options.remote_forwards[i].listen_port, |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1553 | (options.remote_forwards[i].connect_path != NULL) ? |
| 1554 | options.remote_forwards[i].connect_path : |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1555 | options.remote_forwards[i].connect_host, |
| 1556 | options.remote_forwards[i].connect_port); |
Darren Tucker | 68afb8c | 2011-10-02 18:59:03 +1100 | [diff] [blame] | 1557 | options.remote_forwards[i].handle = |
| 1558 | channel_request_remote_forwarding( |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1559 | &options.remote_forwards[i]); |
Darren Tucker | 68afb8c | 2011-10-02 18:59:03 +1100 | [diff] [blame] | 1560 | if (options.remote_forwards[i].handle < 0) { |
Darren Tucker | e7d4b19 | 2006-07-12 22:17:10 +1000 | [diff] [blame] | 1561 | if (options.exit_on_forward_failure) |
| 1562 | fatal("Could not request remote forwarding."); |
| 1563 | else |
| 1564 | logit("Warning: Could not request remote " |
| 1565 | "forwarding."); |
Darren Tucker | 68afb8c | 2011-10-02 18:59:03 +1100 | [diff] [blame] | 1566 | } else { |
| 1567 | client_register_global_confirm(ssh_confirm_remote_forward, |
| 1568 | &options.remote_forwards[i]); |
Darren Tucker | e7d4b19 | 2006-07-12 22:17:10 +1000 | [diff] [blame] | 1569 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1570 | } |
Damien Miller | b3ce9fe | 2007-08-08 14:32:41 +1000 | [diff] [blame] | 1571 | |
| 1572 | /* Initiate tunnel forwarding. */ |
| 1573 | if (options.tun_open != SSH_TUNMODE_NO) { |
| 1574 | if (client_request_tun_fwd(options.tun_open, |
| 1575 | options.tun_local, options.tun_remote) == -1) { |
| 1576 | if (options.exit_on_forward_failure) |
| 1577 | fatal("Could not request tunnel forwarding."); |
| 1578 | else |
| 1579 | error("Could not request tunnel forwarding."); |
| 1580 | } |
| 1581 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1582 | } |
| 1583 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1584 | static void |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1585 | check_agent_present(void) |
| 1586 | { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1587 | int r; |
| 1588 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1589 | if (options.forward_agent) { |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 1590 | /* Clear agent forwarding if we don't have an agent. */ |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1591 | if ((r = ssh_get_authentication_socket(NULL)) != 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1592 | options.forward_agent = 0; |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1593 | if (r != SSH_ERR_AGENT_NOT_PRESENT) |
| 1594 | debug("ssh_get_authentication_socket: %s", |
| 1595 | ssh_err(r)); |
| 1596 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1597 | } |
| 1598 | } |
| 1599 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1600 | static int |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1601 | ssh_session(void) |
| 1602 | { |
| 1603 | int type; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1604 | int interactive = 0; |
| 1605 | int have_tty = 0; |
| 1606 | struct winsize ws; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1607 | char *cp; |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1608 | const char *display; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1609 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1610 | /* Enable compression if requested. */ |
| 1611 | if (options.compression) { |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1612 | debug("Requesting compression at level %d.", |
| 1613 | options.compression_level); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1614 | |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1615 | if (options.compression_level < 1 || |
| 1616 | options.compression_level > 9) |
| 1617 | fatal("Compression level must be from 1 (fast) to " |
| 1618 | "9 (slow, best)."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1619 | |
| 1620 | /* Send the request. */ |
| 1621 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); |
| 1622 | packet_put_int(options.compression_level); |
| 1623 | packet_send(); |
| 1624 | packet_write_wait(); |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 1625 | type = packet_read(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1626 | if (type == SSH_SMSG_SUCCESS) |
| 1627 | packet_start_compression(options.compression_level); |
| 1628 | else if (type == SSH_SMSG_FAILURE) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1629 | logit("Warning: Remote host refused compression."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1630 | else |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1631 | packet_disconnect("Protocol error waiting for " |
| 1632 | "compression response."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1633 | } |
| 1634 | /* Allocate a pseudo tty if appropriate. */ |
| 1635 | if (tty_flag) { |
| 1636 | debug("Requesting pty."); |
| 1637 | |
| 1638 | /* Start the packet. */ |
| 1639 | packet_start(SSH_CMSG_REQUEST_PTY); |
| 1640 | |
| 1641 | /* Store TERM in the packet. There is no limit on the |
| 1642 | length of the string. */ |
| 1643 | cp = getenv("TERM"); |
| 1644 | if (!cp) |
| 1645 | cp = ""; |
Ben Lindstrom | 664408d | 2001-06-09 01:42:01 +0000 | [diff] [blame] | 1646 | packet_put_cstring(cp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1647 | |
| 1648 | /* Store window size in the packet. */ |
| 1649 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
| 1650 | memset(&ws, 0, sizeof(ws)); |
Damien Miller | 71a7367 | 2006-03-26 14:04:36 +1100 | [diff] [blame] | 1651 | packet_put_int((u_int)ws.ws_row); |
| 1652 | packet_put_int((u_int)ws.ws_col); |
| 1653 | packet_put_int((u_int)ws.ws_xpixel); |
| 1654 | packet_put_int((u_int)ws.ws_ypixel); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1655 | |
| 1656 | /* Store tty modes in the packet. */ |
Ben Lindstrom | ae8e2d3 | 2001-04-14 23:13:02 +0000 | [diff] [blame] | 1657 | tty_make_modes(fileno(stdin), NULL); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1658 | |
| 1659 | /* Send the packet, and wait for it to leave. */ |
| 1660 | packet_send(); |
| 1661 | packet_write_wait(); |
| 1662 | |
| 1663 | /* Read response from the server. */ |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 1664 | type = packet_read(); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 1665 | if (type == SSH_SMSG_SUCCESS) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1666 | interactive = 1; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1667 | have_tty = 1; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 1668 | } else if (type == SSH_SMSG_FAILURE) |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1669 | logit("Warning: Remote host failed or refused to " |
| 1670 | "allocate a pseudo tty."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1671 | else |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1672 | packet_disconnect("Protocol error waiting for pty " |
| 1673 | "request response."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1674 | } |
| 1675 | /* Request X11 forwarding if enabled and DISPLAY is set. */ |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1676 | display = getenv("DISPLAY"); |
djm@openbsd.org | a58be33 | 2015-04-17 13:16:48 +0000 | [diff] [blame] | 1677 | if (display == NULL && options.forward_x11) |
| 1678 | debug("X11 forwarding requested but DISPLAY not set"); |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1679 | if (options.forward_x11 && display != NULL) { |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 1680 | char *proto, *data; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1681 | /* Get reasonable local authentication information. */ |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1682 | client_x11_get_proto(display, options.xauth_location, |
Damien Miller | 386feab | 2013-10-15 12:14:49 +1100 | [diff] [blame] | 1683 | options.forward_x11_trusted, |
Damien Miller | 1ab6a51 | 2010-06-26 10:02:24 +1000 | [diff] [blame] | 1684 | options.forward_x11_timeout, |
| 1685 | &proto, &data); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1686 | /* Request forwarding with authentication spoofing. */ |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1687 | debug("Requesting X11 forwarding with authentication " |
| 1688 | "spoofing."); |
Damien Miller | 6d7b437 | 2011-06-23 08:31:57 +1000 | [diff] [blame] | 1689 | x11_request_forwarding_with_spoofing(0, display, proto, |
| 1690 | data, 0); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1691 | /* Read response from the server. */ |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 1692 | type = packet_read(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1693 | if (type == SSH_SMSG_SUCCESS) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1694 | interactive = 1; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1695 | } else if (type == SSH_SMSG_FAILURE) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1696 | logit("Warning: Remote host denied X11 forwarding."); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1697 | } else { |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1698 | packet_disconnect("Protocol error waiting for X11 " |
| 1699 | "forwarding"); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1700 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1701 | } |
| 1702 | /* Tell the packet module whether this is an interactive session. */ |
Damien Miller | 0dac6fb | 2010-11-20 15:19:38 +1100 | [diff] [blame] | 1703 | packet_set_interactive(interactive, |
| 1704 | options.ip_qos_interactive, options.ip_qos_bulk); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1705 | |
| 1706 | /* Request authentication agent forwarding if appropriate. */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1707 | check_agent_present(); |
| 1708 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1709 | if (options.forward_agent) { |
| 1710 | debug("Requesting authentication agent forwarding."); |
| 1711 | auth_request_forwarding(); |
| 1712 | |
| 1713 | /* Read response from the server. */ |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 1714 | type = packet_read(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1715 | packet_check_eom(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1716 | if (type != SSH_SMSG_SUCCESS) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1717 | logit("Warning: Remote host denied authentication agent forwarding."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1718 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1719 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1720 | /* Initiate port forwardings. */ |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1721 | ssh_init_stdio_forwarding(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1722 | ssh_init_forwarding(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1723 | |
Darren Tucker | b776c85 | 2007-12-02 23:06:35 +1100 | [diff] [blame] | 1724 | /* Execute a local command */ |
| 1725 | if (options.local_command != NULL && |
| 1726 | options.permit_local_command) |
| 1727 | ssh_local_cmd(options.local_command); |
| 1728 | |
Darren Tucker | 9a2a609 | 2008-07-04 12:53:50 +1000 | [diff] [blame] | 1729 | /* |
| 1730 | * If requested and we are not interested in replies to remote |
| 1731 | * forwarding requests, then let ssh continue in the background. |
| 1732 | */ |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1733 | if (fork_after_authentication_flag) { |
| 1734 | if (options.exit_on_forward_failure && |
| 1735 | options.num_remote_forwards > 0) { |
| 1736 | debug("deferring postauth fork until remote forward " |
| 1737 | "confirmation received"); |
| 1738 | } else |
| 1739 | fork_postauth(); |
Darren Tucker | 9a2a609 | 2008-07-04 12:53:50 +1000 | [diff] [blame] | 1740 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1741 | |
| 1742 | /* |
| 1743 | * If a command was specified on the command line, execute the |
| 1744 | * command now. Otherwise request the server to start a shell. |
| 1745 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1746 | if (buffer_len(&command) > 0) { |
| 1747 | int len = buffer_len(&command); |
| 1748 | if (len > 900) |
| 1749 | len = 900; |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1750 | debug("Sending command: %.*s", len, |
| 1751 | (u_char *)buffer_ptr(&command)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1752 | packet_start(SSH_CMSG_EXEC_CMD); |
| 1753 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
| 1754 | packet_send(); |
| 1755 | packet_write_wait(); |
| 1756 | } else { |
| 1757 | debug("Requesting shell."); |
| 1758 | packet_start(SSH_CMSG_EXEC_SHELL); |
| 1759 | packet_send(); |
| 1760 | packet_write_wait(); |
| 1761 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1762 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1763 | /* Enter the interactive session. */ |
Ben Lindstrom | 2b1f71b | 2001-06-05 20:32:21 +0000 | [diff] [blame] | 1764 | return client_loop(have_tty, tty_flag ? |
| 1765 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1766 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1767 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1768 | /* request pty/x11/agent/tcpfwd/shell for channel */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1769 | static void |
Damien Miller | d530f5f | 2010-05-21 14:57:10 +1000 | [diff] [blame] | 1770 | ssh_session2_setup(int id, int success, void *arg) |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1771 | { |
Damien Miller | 3756dce | 2004-06-18 01:17:29 +1000 | [diff] [blame] | 1772 | extern char **environ; |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1773 | const char *display; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1774 | int interactive = tty_flag; |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1775 | |
Damien Miller | d530f5f | 2010-05-21 14:57:10 +1000 | [diff] [blame] | 1776 | if (!success) |
| 1777 | return; /* No need for error message, channels code sens one */ |
| 1778 | |
Damien Miller | 46d38de | 2005-07-17 17:02:09 +1000 | [diff] [blame] | 1779 | display = getenv("DISPLAY"); |
djm@openbsd.org | a58be33 | 2015-04-17 13:16:48 +0000 | [diff] [blame] | 1780 | if (display == NULL && options.forward_x11) |
| 1781 | debug("X11 forwarding requested but DISPLAY not set"); |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1782 | if (options.forward_x11 && display != NULL) { |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 1783 | char *proto, *data; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1784 | /* Get reasonable local authentication information. */ |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1785 | client_x11_get_proto(display, options.xauth_location, |
Damien Miller | 1ab6a51 | 2010-06-26 10:02:24 +1000 | [diff] [blame] | 1786 | options.forward_x11_trusted, |
| 1787 | options.forward_x11_timeout, &proto, &data); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1788 | /* Request forwarding with authentication spoofing. */ |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1789 | debug("Requesting X11 forwarding with authentication " |
| 1790 | "spoofing."); |
Damien Miller | 6d7b437 | 2011-06-23 08:31:57 +1000 | [diff] [blame] | 1791 | x11_request_forwarding_with_spoofing(id, display, proto, |
| 1792 | data, 1); |
| 1793 | client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN); |
| 1794 | /* XXX exit_on_forward_failure */ |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 1795 | interactive = 1; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1796 | } |
| 1797 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1798 | check_agent_present(); |
| 1799 | if (options.forward_agent) { |
| 1800 | debug("Requesting authentication agent forwarding."); |
| 1801 | channel_request_start(id, "auth-agent-req@openssh.com", 0); |
| 1802 | packet_send(); |
| 1803 | } |
| 1804 | |
Darren Tucker | 7b30501 | 2012-07-02 18:55:09 +1000 | [diff] [blame] | 1805 | /* Tell the packet module whether this is an interactive session. */ |
| 1806 | packet_set_interactive(interactive, |
| 1807 | options.ip_qos_interactive, options.ip_qos_bulk); |
| 1808 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1809 | client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), |
Damien Miller | 5771ed7 | 2008-05-19 15:35:33 +1000 | [diff] [blame] | 1810 | NULL, fileno(stdin), &command, environ); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1811 | } |
| 1812 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1813 | /* open new channel for a session */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1814 | static int |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1815 | ssh_session2_open(void) |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1816 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1817 | Channel *c; |
| 1818 | int window, packetmax, in, out, err; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1819 | |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 1820 | if (stdin_null_flag) { |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1821 | in = open(_PATH_DEVNULL, O_RDONLY); |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 1822 | } else { |
| 1823 | in = dup(STDIN_FILENO); |
| 1824 | } |
| 1825 | out = dup(STDOUT_FILENO); |
| 1826 | err = dup(STDERR_FILENO); |
| 1827 | |
| 1828 | if (in < 0 || out < 0 || err < 0) |
| 1829 | fatal("dup() in/out/err failed"); |
| 1830 | |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 1831 | /* enable nonblocking unless tty */ |
| 1832 | if (!isatty(in)) |
| 1833 | set_nonblock(in); |
| 1834 | if (!isatty(out)) |
| 1835 | set_nonblock(out); |
| 1836 | if (!isatty(err)) |
| 1837 | set_nonblock(err); |
| 1838 | |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1839 | window = CHAN_SES_WINDOW_DEFAULT; |
| 1840 | packetmax = CHAN_SES_PACKET_DEFAULT; |
Damien Miller | 19a5945 | 2002-02-19 15:20:57 +1100 | [diff] [blame] | 1841 | if (tty_flag) { |
| 1842 | window >>= 1; |
| 1843 | packetmax >>= 1; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1844 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1845 | c = channel_new( |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1846 | "session", SSH_CHANNEL_OPENING, in, out, err, |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1847 | window, packetmax, CHAN_EXTENDED_WRITE, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1848 | "client-session", /*nonblock*/0); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1849 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1850 | debug3("ssh_session2_open: channel_new: %d", c->self); |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1851 | |
Ben Lindstrom | 5ec2645 | 2001-06-09 00:18:51 +0000 | [diff] [blame] | 1852 | channel_send_open(c->self); |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1853 | if (!no_shell_flag) |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 1854 | channel_register_open_confirm(c->self, |
| 1855 | ssh_session2_setup, NULL); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1856 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1857 | return c->self; |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1858 | } |
| 1859 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1860 | static int |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1861 | ssh_session2(void) |
| 1862 | { |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1863 | int id = -1; |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1864 | |
| 1865 | /* XXX should be pre-session */ |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1866 | if (!options.control_persist) |
| 1867 | ssh_init_stdio_forwarding(); |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1868 | ssh_init_forwarding(); |
| 1869 | |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1870 | /* Start listening for multiplex clients */ |
| 1871 | muxserver_listen(); |
| 1872 | |
| 1873 | /* |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1874 | * If we are in control persist mode and have a working mux listen |
| 1875 | * socket, then prepare to background ourselves and have a foreground |
| 1876 | * client attach as a control slave. |
| 1877 | * NB. we must save copies of the flags that we override for |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1878 | * the backgrounding, since we defer attachment of the slave until |
| 1879 | * after the connection is fully established (in particular, |
| 1880 | * async rfwd replies have been received for ExitOnForwardFailure). |
| 1881 | */ |
| 1882 | if (options.control_persist && muxserver_sock != -1) { |
| 1883 | ostdin_null_flag = stdin_null_flag; |
| 1884 | ono_shell_flag = no_shell_flag; |
Damien Miller | 21771e2 | 2011-05-15 08:45:50 +1000 | [diff] [blame] | 1885 | orequest_tty = options.request_tty; |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1886 | otty_flag = tty_flag; |
| 1887 | stdin_null_flag = 1; |
| 1888 | no_shell_flag = 1; |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1889 | tty_flag = 0; |
| 1890 | if (!fork_after_authentication_flag) |
| 1891 | need_controlpersist_detach = 1; |
| 1892 | fork_after_authentication_flag = 1; |
| 1893 | } |
Darren Tucker | 2d6665d | 2011-11-04 10:54:22 +1100 | [diff] [blame] | 1894 | /* |
| 1895 | * ControlPersist mux listen socket setup failed, attempt the |
| 1896 | * stdio forward setup that we skipped earlier. |
| 1897 | */ |
| 1898 | if (options.control_persist && muxserver_sock == -1) |
| 1899 | ssh_init_stdio_forwarding(); |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1900 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1901 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
| 1902 | id = ssh_session2_open(); |
Damien Miller | 649fe02 | 2013-07-18 16:13:55 +1000 | [diff] [blame] | 1903 | else { |
| 1904 | packet_set_interactive( |
| 1905 | options.control_master == SSHCTL_MASTER_NO, |
| 1906 | options.ip_qos_interactive, options.ip_qos_bulk); |
| 1907 | } |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1908 | |
Darren Tucker | 8901fa9 | 2008-06-11 09:34:01 +1000 | [diff] [blame] | 1909 | /* 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] | 1910 | if (options.control_master == SSHCTL_MASTER_NO && |
| 1911 | (datafellows & SSH_NEW_OPENSSH)) { |
Darren Tucker | 8901fa9 | 2008-06-11 09:34:01 +1000 | [diff] [blame] | 1912 | debug("Requesting no-more-sessions@openssh.com"); |
| 1913 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 1914 | packet_put_cstring("no-more-sessions@openssh.com"); |
| 1915 | packet_put_char(0); |
| 1916 | packet_send(); |
| 1917 | } |
| 1918 | |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1919 | /* Execute a local command */ |
| 1920 | if (options.local_command != NULL && |
| 1921 | options.permit_local_command) |
| 1922 | ssh_local_cmd(options.local_command); |
| 1923 | |
Damien Miller | 1f25ab4 | 2010-07-16 13:56:23 +1000 | [diff] [blame] | 1924 | /* |
| 1925 | * If requested and we are not interested in replies to remote |
| 1926 | * forwarding requests, then let ssh continue in the background. |
| 1927 | */ |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1928 | if (fork_after_authentication_flag) { |
| 1929 | if (options.exit_on_forward_failure && |
| 1930 | options.num_remote_forwards > 0) { |
| 1931 | debug("deferring postauth fork until remote forward " |
| 1932 | "confirmation received"); |
| 1933 | } else |
| 1934 | fork_postauth(); |
Darren Tucker | 9a2a609 | 2008-07-04 12:53:50 +1000 | [diff] [blame] | 1935 | } |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1936 | |
Darren Tucker | f1de4e5 | 2010-01-08 16:54:59 +1100 | [diff] [blame] | 1937 | if (options.use_roaming) |
| 1938 | request_roaming(); |
| 1939 | |
Ben Lindstrom | 2b1f71b | 2001-06-05 20:32:21 +0000 | [diff] [blame] | 1940 | return client_loop(tty_flag, tty_flag ? |
| 1941 | options.escape_char : SSH_ESCAPECHAR_NONE, id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1942 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1943 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1944 | static void |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1945 | load_public_identity_files(void) |
| 1946 | { |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 1947 | char *filename, *cp, thishost[NI_MAXHOST]; |
Darren Tucker | b4fbbc6 | 2007-12-02 23:16:32 +1100 | [diff] [blame] | 1948 | char *pwdir = NULL, *pwname = NULL; |
Ben Lindstrom | 711b04a | 2001-08-06 21:12:42 +0000 | [diff] [blame] | 1949 | int i = 0; |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1950 | Key *public; |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 1951 | struct passwd *pw; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1952 | u_int n_ids; |
| 1953 | char *identity_files[SSH_MAX_IDENTITY_FILES]; |
| 1954 | Key *identity_keys[SSH_MAX_IDENTITY_FILES]; |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1955 | #ifdef ENABLE_PKCS11 |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1956 | Key **keys; |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1957 | int nkeys; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1958 | #endif /* PKCS11 */ |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1959 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1960 | n_ids = 0; |
Damien Miller | 1d2c456 | 2014-02-04 11:18:20 +1100 | [diff] [blame] | 1961 | memset(identity_files, 0, sizeof(identity_files)); |
| 1962 | memset(identity_keys, 0, sizeof(identity_keys)); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1963 | |
| 1964 | #ifdef ENABLE_PKCS11 |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1965 | if (options.pkcs11_provider != NULL && |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1966 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1967 | (pkcs11_init(!options.batch_mode) == 0) && |
| 1968 | (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL, |
| 1969 | &keys)) > 0) { |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1970 | for (i = 0; i < nkeys; i++) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1971 | if (n_ids >= SSH_MAX_IDENTITY_FILES) { |
| 1972 | key_free(keys[i]); |
| 1973 | continue; |
| 1974 | } |
| 1975 | identity_keys[n_ids] = keys[i]; |
| 1976 | identity_files[n_ids] = |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1977 | xstrdup(options.pkcs11_provider); /* XXX */ |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1978 | n_ids++; |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1979 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1980 | free(keys); |
Ben Lindstrom | 711b04a | 2001-08-06 21:12:42 +0000 | [diff] [blame] | 1981 | } |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1982 | #endif /* ENABLE_PKCS11 */ |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 1983 | if ((pw = getpwuid(original_real_uid)) == NULL) |
| 1984 | fatal("load_public_identity_files: getpwuid failed"); |
Darren Tucker | e143f06 | 2007-12-02 23:21:16 +1100 | [diff] [blame] | 1985 | pwname = xstrdup(pw->pw_name); |
| 1986 | pwdir = xstrdup(pw->pw_dir); |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 1987 | if (gethostname(thishost, sizeof(thishost)) == -1) |
| 1988 | fatal("load_public_identity_files: gethostname: %s", |
| 1989 | strerror(errno)); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1990 | for (i = 0; i < options.num_identity_files; i++) { |
Darren Tucker | 15fd19c | 2013-04-05 11:22:26 +1100 | [diff] [blame] | 1991 | if (n_ids >= SSH_MAX_IDENTITY_FILES || |
| 1992 | strcasecmp(options.identity_files[i], "none") == 0) { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1993 | free(options.identity_files[i]); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1994 | continue; |
| 1995 | } |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 1996 | cp = tilde_expand_filename(options.identity_files[i], |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1997 | original_real_uid); |
Darren Tucker | b4fbbc6 | 2007-12-02 23:16:32 +1100 | [diff] [blame] | 1998 | filename = percent_expand(cp, "d", pwdir, |
| 1999 | "u", pwname, "l", thishost, "h", host, |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 2000 | "r", options.user, (char *)NULL); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2001 | free(cp); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 2002 | public = key_load_public(filename, NULL); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 2003 | debug("identity file %s type %d", filename, |
| 2004 | public ? public->type : -1); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2005 | free(options.identity_files[i]); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 2006 | identity_files[n_ids] = filename; |
| 2007 | identity_keys[n_ids] = public; |
| 2008 | |
| 2009 | if (++n_ids >= SSH_MAX_IDENTITY_FILES) |
| 2010 | continue; |
| 2011 | |
| 2012 | /* Try to add the certificate variant too */ |
| 2013 | xasprintf(&cp, "%s-cert", filename); |
| 2014 | public = key_load_public(cp, NULL); |
| 2015 | debug("identity file %s type %d", cp, |
| 2016 | public ? public->type : -1); |
| 2017 | if (public == NULL) { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2018 | free(cp); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 2019 | continue; |
| 2020 | } |
| 2021 | if (!key_is_cert(public)) { |
| 2022 | debug("%s: key %s type %s is not a certificate", |
| 2023 | __func__, cp, key_type(public)); |
| 2024 | key_free(public); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2025 | free(cp); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 2026 | continue; |
| 2027 | } |
| 2028 | identity_keys[n_ids] = public; |
| 2029 | /* point to the original path, most likely the private key */ |
| 2030 | identity_files[n_ids] = xstrdup(filename); |
| 2031 | n_ids++; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 2032 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 2033 | options.num_identity_files = n_ids; |
| 2034 | memcpy(options.identity_files, identity_files, sizeof(identity_files)); |
| 2035 | memcpy(options.identity_keys, identity_keys, sizeof(identity_keys)); |
| 2036 | |
Damien Miller | 1d2c456 | 2014-02-04 11:18:20 +1100 | [diff] [blame] | 2037 | explicit_bzero(pwname, strlen(pwname)); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2038 | free(pwname); |
Damien Miller | 1d2c456 | 2014-02-04 11:18:20 +1100 | [diff] [blame] | 2039 | explicit_bzero(pwdir, strlen(pwdir)); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2040 | free(pwdir); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 2041 | } |
Damien Miller | 857b02e | 2010-09-24 22:02:56 +1000 | [diff] [blame] | 2042 | |
| 2043 | static void |
| 2044 | main_sigchld_handler(int sig) |
| 2045 | { |
| 2046 | int save_errno = errno; |
| 2047 | pid_t pid; |
| 2048 | int status; |
| 2049 | |
| 2050 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || |
| 2051 | (pid < 0 && errno == EINTR)) |
| 2052 | ; |
| 2053 | |
| 2054 | signal(sig, main_sigchld_handler); |
| 2055 | errno = save_errno; |
| 2056 | } |