Damien Miller | 5929c52 | 2010-09-10 11:17:02 +1000 | [diff] [blame] | 1 | /* $OpenBSD: ssh.c,v 1.351 2010/09/02 16:08:39 markus 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> |
Darren Tucker | 199b134 | 2009-07-06 07:16:56 +1000 | [diff] [blame] | 51 | #include <sys/param.h> |
Damien Miller | e3b60b5 | 2006-07-10 21:08:03 +1000 | [diff] [blame] | 52 | #include <sys/socket.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> |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 69 | |
Darren Tucker | 46aa3e0 | 2006-09-02 15:32:40 +1000 | [diff] [blame] | 70 | #include <netinet/in.h> |
| 71 | #include <arpa/inet.h> |
| 72 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 73 | #include <openssl/evp.h> |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 74 | #include <openssl/err.h> |
Darren Tucker | bfaaf96 | 2008-02-28 19:13:52 +1100 | [diff] [blame] | 75 | #include "openbsd-compat/openssl-compat.h" |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 76 | #include "openbsd-compat/sys-queue.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 77 | |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 78 | #include "xmalloc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 79 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 80 | #include "ssh1.h" |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 81 | #include "ssh2.h" |
Damien Miller | b96c441 | 2010-07-02 13:34:24 +1000 | [diff] [blame] | 82 | #include "canohost.h" |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 83 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 84 | #include "cipher.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 85 | #include "packet.h" |
| 86 | #include "buffer.h" |
Ben Lindstrom | c763767 | 2001-06-09 00:36:26 +0000 | [diff] [blame] | 87 | #include "channels.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 88 | #include "key.h" |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 89 | #include "authfd.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 90 | #include "authfile.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 91 | #include "pathnames.h" |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 92 | #include "dispatch.h" |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 93 | #include "clientloop.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 94 | #include "log.h" |
| 95 | #include "readconf.h" |
| 96 | #include "sshconnect.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 97 | #include "misc.h" |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 98 | #include "kex.h" |
| 99 | #include "mac.h" |
Darren Tucker | 06f2bd8 | 2004-05-13 16:06:46 +1000 | [diff] [blame] | 100 | #include "sshpty.h" |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 101 | #include "match.h" |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 102 | #include "msg.h" |
Darren Tucker | 25f60a7 | 2004-08-15 17:23:34 +1000 | [diff] [blame] | 103 | #include "uidswap.h" |
Darren Tucker | f1de4e5 | 2010-01-08 16:54:59 +1100 | [diff] [blame] | 104 | #include "roaming.h" |
Damien Miller | b757677 | 2006-07-10 20:23:39 +1000 | [diff] [blame] | 105 | #include "version.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 106 | |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 107 | #ifdef ENABLE_PKCS11 |
| 108 | #include "ssh-pkcs11.h" |
Ben Lindstrom | bcc1808 | 2001-08-06 21:59:25 +0000 | [diff] [blame] | 109 | #endif |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 110 | |
Damien Miller | 3f90587 | 1999-11-15 17:10:57 +1100 | [diff] [blame] | 111 | extern char *__progname; |
Damien Miller | 3f90587 | 1999-11-15 17:10:57 +1100 | [diff] [blame] | 112 | |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 113 | /* 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] | 114 | int debug_flag = 0; |
| 115 | |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 116 | /* Flag indicating whether a tty should be allocated */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 117 | int tty_flag = 0; |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 118 | int no_tty_flag = 0; |
| 119 | int force_tty_flag = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 120 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 121 | /* don't exec a shell */ |
| 122 | int no_shell_flag = 0; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 123 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 124 | /* |
| 125 | * Flag indicating that nothing should be read from stdin. This can be set |
| 126 | * on the command line. |
| 127 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 128 | int stdin_null_flag = 0; |
| 129 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 130 | /* |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 131 | * Flag indicating that the current process should be backgrounded and |
| 132 | * a new slave launched in the foreground for ControlPersist. |
| 133 | */ |
| 134 | int need_controlpersist_detach = 0; |
| 135 | |
| 136 | /* Copies of flags for ControlPersist foreground slave */ |
| 137 | int ostdin_null_flag, ono_shell_flag, ono_tty_flag, otty_flag; |
| 138 | |
| 139 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 140 | * Flag indicating that ssh should fork after authentication. This is useful |
Ben Lindstrom | f666fec | 2002-06-06 19:51:58 +0000 | [diff] [blame] | 141 | * 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] | 142 | * background. |
| 143 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 144 | int fork_after_authentication_flag = 0; |
| 145 | |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 146 | /* forward stdio to remote host and port */ |
| 147 | char *stdio_forward_host = NULL; |
| 148 | int stdio_forward_port = 0; |
| 149 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 150 | /* |
| 151 | * General data structure for command line options and options configurable |
| 152 | * in configuration files. See readconf.h. |
| 153 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 154 | Options options; |
| 155 | |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 156 | /* optional user configfile */ |
| 157 | char *config = NULL; |
| 158 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 159 | /* |
| 160 | * Name of the host we are connecting to. This is the name given on the |
| 161 | * command line, or the HostName specified for the user-supplied name in a |
| 162 | * configuration file. |
| 163 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 164 | char *host; |
| 165 | |
| 166 | /* socket address the host resolves to */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 167 | struct sockaddr_storage hostaddr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 168 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 169 | /* Private host keys. */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 170 | Sensitive sensitive_data; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 171 | |
| 172 | /* Original real UID. */ |
| 173 | uid_t original_real_uid; |
Ben Lindstrom | f9c4884 | 2002-06-11 16:37:51 +0000 | [diff] [blame] | 174 | uid_t original_effective_uid; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 175 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 176 | /* command to be executed */ |
| 177 | Buffer command; |
| 178 | |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 179 | /* Should we execute a command or invoke a subsystem? */ |
| 180 | int subsystem_flag = 0; |
| 181 | |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame] | 182 | /* # of replies received for global requests */ |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 183 | static int remote_forward_confirms_received = 0; |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame] | 184 | |
Damien Miller | 8c4e18a | 2002-09-19 12:05:02 +1000 | [diff] [blame] | 185 | /* pid of proxycommand child process */ |
| 186 | pid_t proxy_command_pid = 0; |
| 187 | |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 188 | /* mux.c */ |
| 189 | extern int muxserver_sock; |
| 190 | extern u_int muxclient_command; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 191 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 192 | /* Prints a help message to the user. This function never returns. */ |
| 193 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 194 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 195 | usage(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 196 | { |
Damien Miller | 5095510 | 2004-03-22 09:34:58 +1100 | [diff] [blame] | 197 | fprintf(stderr, |
Damien Miller | c13c3ee | 2008-11-03 19:23:28 +1100 | [diff] [blame] | 198 | "usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n" |
Darren Tucker | 895d698 | 2005-10-03 18:18:05 +1000 | [diff] [blame] | 199 | " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n" |
Damien Miller | 048dc93 | 2010-02-12 09:22:04 +1100 | [diff] [blame] | 200 | " [-I pkcs11] [-i identity_file]\n" |
| 201 | " [-L [bind_address:]port:host:hostport]\n" |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 202 | " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n" |
Damien Miller | 02faece | 2005-03-02 12:04:32 +1100 | [diff] [blame] | 203 | " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n" |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 204 | " [-W host:port] [-w local_tun[:remote_tun]]\n" |
| 205 | " [user@]hostname [command]\n" |
Damien Miller | 5095510 | 2004-03-22 09:34:58 +1100 | [diff] [blame] | 206 | ); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 207 | exit(255); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 208 | } |
| 209 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 210 | static int ssh_session(void); |
| 211 | static int ssh_session2(void); |
| 212 | static void load_public_identity_files(void); |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 213 | |
| 214 | /* from muxclient.c */ |
| 215 | void muxclient(const char *); |
| 216 | void muxserver_listen(void); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 217 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 218 | /* |
| 219 | * Main program for the ssh client. |
| 220 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 221 | int |
| 222 | main(int ac, char **av) |
| 223 | { |
Darren Tucker | 199b134 | 2009-07-06 07:16:56 +1000 | [diff] [blame] | 224 | int i, r, opt, exit_status, use_syslog; |
| 225 | char *p, *cp, *line, *argv0, buf[MAXPATHLEN]; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 226 | struct stat st; |
Ben Lindstrom | 086cf21 | 2001-03-05 05:56:40 +0000 | [diff] [blame] | 227 | struct passwd *pw; |
Damien Miller | 67bd062 | 2007-09-17 12:06:57 +1000 | [diff] [blame] | 228 | int dummy, timeout_ms; |
Ben Lindstrom | 5ccf63a | 2001-09-24 20:00:10 +0000 | [diff] [blame] | 229 | extern int optind, optreset; |
Damien Miller | 4f8e669 | 2001-07-14 13:22:53 +1000 | [diff] [blame] | 230 | extern char *optarg; |
Damien Miller | 9651fe6 | 2005-06-26 08:55:25 +1000 | [diff] [blame] | 231 | struct servent *sp; |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 232 | Forward fwd; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 233 | |
Darren Tucker | ce321d8 | 2005-10-03 18:11:24 +1000 | [diff] [blame] | 234 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
| 235 | sanitise_stdfd(); |
| 236 | |
Damien Miller | 59d3d5b | 2003-08-22 09:34:41 +1000 | [diff] [blame] | 237 | __progname = ssh_get_progname(av[0]); |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 238 | init_rng(); |
| 239 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 240 | /* |
Damien Miller | 00d9ae2 | 2010-08-17 01:59:31 +1000 | [diff] [blame] | 241 | * Discard other fds that are hanging around. These can cause problem |
| 242 | * with backgrounded ssh processes started by ControlPersist. |
| 243 | */ |
| 244 | closefrom(STDERR_FILENO + 1); |
| 245 | |
| 246 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 247 | * Save the original real uid. It will be needed later (uid-swapping |
| 248 | * may clobber the real uid). |
| 249 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 250 | original_real_uid = getuid(); |
| 251 | original_effective_uid = geteuid(); |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 252 | |
Damien Miller | 50b9a60 | 2002-09-04 16:50:06 +1000 | [diff] [blame] | 253 | /* |
| 254 | * Use uid-swapping to give up root privileges for the duration of |
| 255 | * option processing. We will re-instantiate the rights when we are |
| 256 | * ready to create the privileged port, and will permanently drop |
| 257 | * them when the port has been created (actually, when the connection |
| 258 | * has been made, as we may need to create the port several times). |
| 259 | */ |
| 260 | PRIV_END; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 261 | |
Damien Miller | 05dd795 | 2000-10-01 00:42:48 +1100 | [diff] [blame] | 262 | #ifdef HAVE_SETRLIMIT |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 263 | /* If we are installed setuid root be careful to not drop core. */ |
| 264 | if (original_real_uid != original_effective_uid) { |
| 265 | struct rlimit rlim; |
| 266 | rlim.rlim_cur = rlim.rlim_max = 0; |
| 267 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) |
| 268 | fatal("setrlimit failed: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 269 | } |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 270 | #endif |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 271 | /* Get user data. */ |
| 272 | pw = getpwuid(original_real_uid); |
| 273 | if (!pw) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 274 | logit("You don't exist, go away!"); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 275 | exit(255); |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 276 | } |
| 277 | /* Take a copy of the returned structure. */ |
| 278 | pw = pwcopy(pw); |
| 279 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 280 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 281 | * Set our umask to something reasonable, as some files are created |
| 282 | * with the default umask. This will make them world-readable but |
| 283 | * writable only by the owner, which is ok for all files for which we |
| 284 | * don't set the modes explicitly. |
| 285 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 286 | umask(022); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 287 | |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 288 | /* |
| 289 | * Initialize option structure to indicate that no values have been |
| 290 | * set. |
| 291 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 292 | initialize_options(&options); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 293 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 294 | /* Parse command-line arguments. */ |
| 295 | host = NULL; |
Damien Miller | e272a5b | 2008-11-03 19:22:37 +1100 | [diff] [blame] | 296 | use_syslog = 0; |
Darren Tucker | 72efd74 | 2009-06-21 17:48:00 +1000 | [diff] [blame] | 297 | argv0 = av[0]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 298 | |
Damien Miller | 2ecb6bd | 2006-03-15 12:03:53 +1100 | [diff] [blame] | 299 | again: |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 300 | while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx" |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 301 | "ACD:F:I:KL:MNO:PR:S:TVw:W:XYy")) != -1) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 302 | switch (opt) { |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 303 | case '1': |
| 304 | options.protocol = SSH_PROTO_1; |
| 305 | break; |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 306 | case '2': |
| 307 | options.protocol = SSH_PROTO_2; |
| 308 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 309 | case '4': |
Darren Tucker | 0a4f04b | 2003-07-03 20:37:47 +1000 | [diff] [blame] | 310 | options.address_family = AF_INET; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 311 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 312 | case '6': |
Darren Tucker | 0a4f04b | 2003-07-03 20:37:47 +1000 | [diff] [blame] | 313 | options.address_family = AF_INET6; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 314 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 315 | case 'n': |
| 316 | stdin_null_flag = 1; |
| 317 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 318 | case 'f': |
| 319 | fork_after_authentication_flag = 1; |
| 320 | stdin_null_flag = 1; |
| 321 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 322 | case 'x': |
| 323 | options.forward_x11 = 0; |
| 324 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 325 | case 'X': |
| 326 | options.forward_x11 = 1; |
| 327 | break; |
Damien Miller | e272a5b | 2008-11-03 19:22:37 +1100 | [diff] [blame] | 328 | case 'y': |
| 329 | use_syslog = 1; |
| 330 | break; |
Darren Tucker | 0a118da | 2003-10-15 15:54:32 +1000 | [diff] [blame] | 331 | case 'Y': |
| 332 | options.forward_x11 = 1; |
| 333 | options.forward_x11_trusted = 1; |
| 334 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 335 | case 'g': |
| 336 | options.gateway_ports = 1; |
| 337 | break; |
Darren Tucker | 7ebfc10 | 2004-11-07 20:06:19 +1100 | [diff] [blame] | 338 | case 'O': |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 339 | if (stdio_forward_host != NULL) |
| 340 | fatal("Cannot specify multiplexing " |
| 341 | "command with -W"); |
| 342 | else if (muxclient_command != 0) |
| 343 | fatal("Multiplexing command already specified"); |
Darren Tucker | 7ebfc10 | 2004-11-07 20:06:19 +1100 | [diff] [blame] | 344 | if (strcmp(optarg, "check") == 0) |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 345 | muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK; |
Damien Miller | 388f6fc | 2010-05-21 14:57:35 +1000 | [diff] [blame] | 346 | else if (strcmp(optarg, "forward") == 0) |
| 347 | muxclient_command = SSHMUX_COMMAND_FORWARD; |
Darren Tucker | 7ebfc10 | 2004-11-07 20:06:19 +1100 | [diff] [blame] | 348 | else if (strcmp(optarg, "exit") == 0) |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 349 | muxclient_command = SSHMUX_COMMAND_TERMINATE; |
Darren Tucker | 7ebfc10 | 2004-11-07 20:06:19 +1100 | [diff] [blame] | 350 | else |
| 351 | fatal("Invalid multiplex command."); |
| 352 | break; |
Damien Miller | 147bba3 | 2002-09-04 16:46:06 +1000 | [diff] [blame] | 353 | case 'P': /* deprecated */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 354 | options.use_privileged_port = 0; |
| 355 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 356 | case 'a': |
| 357 | options.forward_agent = 0; |
| 358 | break; |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 359 | case 'A': |
| 360 | options.forward_agent = 1; |
| 361 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 362 | case 'k': |
Damien Miller | e0113cc | 2003-11-24 13:10:09 +1100 | [diff] [blame] | 363 | options.gss_deleg_creds = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 364 | break; |
Darren Tucker | 415bddc | 2007-06-12 23:43:16 +1000 | [diff] [blame] | 365 | case 'K': |
| 366 | options.gss_authentication = 1; |
| 367 | options.gss_deleg_creds = 1; |
| 368 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 369 | case 'i': |
| 370 | if (stat(optarg, &st) < 0) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 371 | fprintf(stderr, "Warning: Identity file %s " |
Damien Miller | 3eb48b6 | 2005-03-01 21:15:46 +1100 | [diff] [blame] | 372 | "not accessible: %s.\n", optarg, |
| 373 | strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 374 | break; |
| 375 | } |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 376 | if (options.num_identity_files >= |
| 377 | SSH_MAX_IDENTITY_FILES) |
| 378 | fatal("Too many identity files specified " |
| 379 | "(max %d)", SSH_MAX_IDENTITY_FILES); |
| 380 | options.identity_files[options.num_identity_files++] = |
| 381 | xstrdup(optarg); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 382 | break; |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 383 | case 'I': |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 384 | #ifdef ENABLE_PKCS11 |
| 385 | options.pkcs11_provider = xstrdup(optarg); |
Ben Lindstrom | bcc1808 | 2001-08-06 21:59:25 +0000 | [diff] [blame] | 386 | #else |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 387 | fprintf(stderr, "no support for PKCS#11.\n"); |
Ben Lindstrom | bcc1808 | 2001-08-06 21:59:25 +0000 | [diff] [blame] | 388 | #endif |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 389 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 390 | case 't': |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 391 | if (tty_flag) |
| 392 | force_tty_flag = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 393 | tty_flag = 1; |
| 394 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 395 | case 'v': |
Darren Tucker | e98dfa3 | 2003-07-19 19:54:31 +1000 | [diff] [blame] | 396 | if (debug_flag == 0) { |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 397 | debug_flag = 1; |
| 398 | options.log_level = SYSLOG_LEVEL_DEBUG1; |
Darren Tucker | e98dfa3 | 2003-07-19 19:54:31 +1000 | [diff] [blame] | 399 | } else { |
| 400 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) |
| 401 | options.log_level++; |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 402 | break; |
Darren Tucker | e98dfa3 | 2003-07-19 19:54:31 +1000 | [diff] [blame] | 403 | } |
Darren Tucker | e9bf984 | 2004-11-05 20:05:32 +1100 | [diff] [blame] | 404 | /* FALLTHROUGH */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 405 | case 'V': |
Damien Miller | 0c889cd | 2004-03-22 09:36:00 +1100 | [diff] [blame] | 406 | fprintf(stderr, "%s, %s\n", |
Damien Miller | 2aa6d3c | 2004-09-12 16:53:04 +1000 | [diff] [blame] | 407 | SSH_RELEASE, SSLeay_version(SSLEAY_VERSION)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 408 | if (opt == 'V') |
| 409 | exit(0); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 410 | break; |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 411 | case 'w': |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 412 | if (options.tun_open == -1) |
| 413 | options.tun_open = SSH_TUNMODE_DEFAULT; |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 414 | options.tun_local = a2tun(optarg, &options.tun_remote); |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 415 | if (options.tun_local == SSH_TUNID_ERR) { |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 416 | fprintf(stderr, |
| 417 | "Bad tun device '%s'\n", optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 418 | exit(255); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 419 | } |
| 420 | break; |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 421 | case 'W': |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 422 | if (stdio_forward_host != NULL) |
| 423 | fatal("stdio forward already specified"); |
| 424 | if (muxclient_command != 0) |
| 425 | fatal("Cannot specify stdio forward with -O"); |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 426 | if (parse_forward(&fwd, optarg, 1, 0)) { |
| 427 | stdio_forward_host = fwd.listen_host; |
| 428 | stdio_forward_port = fwd.listen_port; |
| 429 | xfree(fwd.connect_host); |
| 430 | } else { |
| 431 | fprintf(stderr, |
| 432 | "Bad stdio forwarding specification '%s'\n", |
| 433 | optarg); |
| 434 | exit(255); |
| 435 | } |
| 436 | no_tty_flag = 1; |
| 437 | no_shell_flag = 1; |
| 438 | options.clear_forwardings = 1; |
| 439 | options.exit_on_forward_failure = 1; |
| 440 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 441 | case 'q': |
| 442 | options.log_level = SYSLOG_LEVEL_QUIET; |
| 443 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 444 | case 'e': |
| 445 | if (optarg[0] == '^' && optarg[2] == 0 && |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 446 | (u_char) optarg[1] >= 64 && |
| 447 | (u_char) optarg[1] < 128) |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 448 | options.escape_char = (u_char) optarg[1] & 31; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 449 | else if (strlen(optarg) == 1) |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 450 | options.escape_char = (u_char) optarg[0]; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 451 | else if (strcmp(optarg, "none") == 0) |
Ben Lindstrom | 2b1f71b | 2001-06-05 20:32:21 +0000 | [diff] [blame] | 452 | options.escape_char = SSH_ESCAPECHAR_NONE; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 453 | else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 454 | fprintf(stderr, "Bad escape character '%s'.\n", |
| 455 | optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 456 | exit(255); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 457 | } |
| 458 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 459 | case 'c': |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 460 | if (ciphers_valid(optarg)) { |
| 461 | /* SSH2 only */ |
| 462 | options.ciphers = xstrdup(optarg); |
Darren Tucker | 5cb30ad | 2004-08-12 22:40:24 +1000 | [diff] [blame] | 463 | options.cipher = SSH_CIPHER_INVALID; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 464 | } else { |
| 465 | /* SSH1 only */ |
Damien Miller | e39cacc | 2000-11-29 12:18:44 +1100 | [diff] [blame] | 466 | options.cipher = cipher_number(optarg); |
| 467 | if (options.cipher == -1) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 468 | fprintf(stderr, |
| 469 | "Unknown cipher type '%s'\n", |
| 470 | optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 471 | exit(255); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 472 | } |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 473 | if (options.cipher == SSH_CIPHER_3DES) |
Damien Miller | e39cacc | 2000-11-29 12:18:44 +1100 | [diff] [blame] | 474 | options.ciphers = "3des-cbc"; |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 475 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
Damien Miller | e39cacc | 2000-11-29 12:18:44 +1100 | [diff] [blame] | 476 | options.ciphers = "blowfish-cbc"; |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 477 | else |
Damien Miller | e39cacc | 2000-11-29 12:18:44 +1100 | [diff] [blame] | 478 | options.ciphers = (char *)-1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 479 | } |
| 480 | break; |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 481 | case 'm': |
| 482 | if (mac_valid(optarg)) |
| 483 | options.macs = xstrdup(optarg); |
| 484 | else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 485 | fprintf(stderr, "Unknown mac type '%s'\n", |
| 486 | optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 487 | exit(255); |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 488 | } |
| 489 | break; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 490 | case 'M': |
Damien Miller | d14b1e7 | 2005-06-16 13:19:41 +1000 | [diff] [blame] | 491 | if (options.control_master == SSHCTL_MASTER_YES) |
| 492 | options.control_master = SSHCTL_MASTER_ASK; |
| 493 | else |
| 494 | options.control_master = SSHCTL_MASTER_YES; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 495 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 496 | case 'p': |
Ben Lindstrom | 19066a1 | 2001-04-12 23:39:26 +0000 | [diff] [blame] | 497 | options.port = a2port(optarg); |
Damien Miller | 3dc71ad | 2009-01-28 16:31:22 +1100 | [diff] [blame] | 498 | if (options.port <= 0) { |
Ben Lindstrom | 146edb9 | 2001-04-11 23:06:28 +0000 | [diff] [blame] | 499 | fprintf(stderr, "Bad port '%s'\n", optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 500 | exit(255); |
Ben Lindstrom | 146edb9 | 2001-04-11 23:06:28 +0000 | [diff] [blame] | 501 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 502 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 503 | case 'l': |
| 504 | options.user = optarg; |
| 505 | break; |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 506 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 507 | case 'L': |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 508 | if (parse_forward(&fwd, optarg, 0, 0)) |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 509 | add_local_forward(&options, &fwd); |
| 510 | else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 511 | fprintf(stderr, |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 512 | "Bad local forwarding specification '%s'\n", |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 513 | optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 514 | exit(255); |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 515 | } |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 516 | break; |
| 517 | |
| 518 | case 'R': |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 519 | if (parse_forward(&fwd, optarg, 0, 1)) { |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 520 | add_remote_forward(&options, &fwd); |
| 521 | } else { |
| 522 | fprintf(stderr, |
| 523 | "Bad remote forwarding specification " |
| 524 | "'%s'\n", optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 525 | exit(255); |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 526 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 527 | break; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 528 | |
| 529 | case 'D': |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 530 | if (parse_forward(&fwd, optarg, 1, 0)) { |
Damien Miller | a699d95 | 2008-11-03 19:27:34 +1100 | [diff] [blame] | 531 | add_local_forward(&options, &fwd); |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 532 | } else { |
Damien Miller | a699d95 | 2008-11-03 19:27:34 +1100 | [diff] [blame] | 533 | fprintf(stderr, |
| 534 | "Bad dynamic forwarding specification " |
| 535 | "'%s'\n", optarg); |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 536 | exit(255); |
Ben Lindstrom | 146edb9 | 2001-04-11 23:06:28 +0000 | [diff] [blame] | 537 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 538 | break; |
| 539 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 540 | case 'C': |
| 541 | options.compression = 1; |
| 542 | break; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 543 | case 'N': |
| 544 | no_shell_flag = 1; |
| 545 | no_tty_flag = 1; |
| 546 | break; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 547 | case 'T': |
| 548 | no_tty_flag = 1; |
| 549 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 550 | case 'o': |
| 551 | dummy = 1; |
Damien Miller | 9836cf8 | 2003-12-17 16:30:06 +1100 | [diff] [blame] | 552 | line = xstrdup(optarg); |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 553 | if (process_config_line(&options, host ? host : "", |
Damien Miller | 9836cf8 | 2003-12-17 16:30:06 +1100 | [diff] [blame] | 554 | line, "command-line", 0, &dummy) != 0) |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 555 | exit(255); |
Damien Miller | 9836cf8 | 2003-12-17 16:30:06 +1100 | [diff] [blame] | 556 | xfree(line); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 557 | break; |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 558 | case 's': |
| 559 | subsystem_flag = 1; |
| 560 | break; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 561 | case 'S': |
| 562 | if (options.control_path != NULL) |
| 563 | free(options.control_path); |
| 564 | options.control_path = xstrdup(optarg); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 565 | break; |
Ben Lindstrom | e0f8804 | 2001-04-30 13:06:24 +0000 | [diff] [blame] | 566 | case 'b': |
| 567 | options.bind_address = optarg; |
| 568 | break; |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 569 | case 'F': |
| 570 | config = optarg; |
| 571 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 572 | default: |
| 573 | usage(); |
| 574 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 575 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 576 | |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 577 | ac -= optind; |
| 578 | av += optind; |
| 579 | |
Darren Tucker | b8c884a | 2010-01-08 18:53:43 +1100 | [diff] [blame] | 580 | if (ac > 0 && !host) { |
Ben Lindstrom | c276c12 | 2002-12-23 02:14:51 +0000 | [diff] [blame] | 581 | if (strrchr(*av, '@')) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 582 | p = xstrdup(*av); |
Ben Lindstrom | c276c12 | 2002-12-23 02:14:51 +0000 | [diff] [blame] | 583 | cp = strrchr(p, '@'); |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 584 | if (cp == NULL || cp == p) |
| 585 | usage(); |
| 586 | options.user = p; |
| 587 | *cp = '\0'; |
| 588 | host = ++cp; |
| 589 | } else |
| 590 | host = *av; |
Ben Lindstrom | b9fa691 | 2002-12-23 02:24:54 +0000 | [diff] [blame] | 591 | if (ac > 1) { |
| 592 | optind = optreset = 1; |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 593 | goto again; |
| 594 | } |
Ben Lindstrom | b9fa691 | 2002-12-23 02:24:54 +0000 | [diff] [blame] | 595 | ac--, av++; |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 596 | } |
| 597 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 598 | /* Check that we got a host name. */ |
| 599 | if (!host) |
| 600 | usage(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 601 | |
Damien Miller | 4314c2b | 2010-09-10 11:12:09 +1000 | [diff] [blame] | 602 | OpenSSL_add_all_algorithms(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 603 | ERR_load_crypto_strings(); |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 604 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 605 | /* Initialize the command to execute on remote host. */ |
| 606 | buffer_init(&command); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 607 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 608 | /* |
| 609 | * Save the command to execute on the remote host in a buffer. There |
| 610 | * is no limit on the length of the command, except by the maximum |
| 611 | * packet size. Also sets the tty flag if there is no command. |
| 612 | */ |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 613 | if (!ac) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 614 | /* No command specified - execute shell on a tty. */ |
| 615 | tty_flag = 1; |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 616 | if (subsystem_flag) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 617 | fprintf(stderr, |
| 618 | "You must specify a subsystem to invoke.\n"); |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 619 | usage(); |
| 620 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 621 | } else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 622 | /* A command has been specified. Store it into the buffer. */ |
| 623 | for (i = 0; i < ac; i++) { |
| 624 | if (i) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 625 | buffer_append(&command, " ", 1); |
| 626 | buffer_append(&command, av[i], strlen(av[i])); |
| 627 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 628 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 629 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 630 | /* Cannot fork to background if no command. */ |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 631 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && |
| 632 | !no_shell_flag) |
| 633 | fatal("Cannot fork into background without a command " |
| 634 | "to execute."); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 635 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 636 | /* Allocate a tty by default if no command specified. */ |
| 637 | if (buffer_len(&command) == 0) |
| 638 | tty_flag = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 639 | |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 640 | /* Force no tty */ |
Damien Miller | deb5a14 | 2010-04-16 15:52:43 +1000 | [diff] [blame] | 641 | if (no_tty_flag || muxclient_command != 0) |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 642 | tty_flag = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 643 | /* Do not allocate a tty if stdin is not a tty. */ |
Damien Miller | ddee575 | 2005-05-26 12:05:05 +1000 | [diff] [blame] | 644 | if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 645 | if (tty_flag) |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 646 | logit("Pseudo-terminal will not be allocated because " |
| 647 | "stdin is not a terminal."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 648 | tty_flag = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 649 | } |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 650 | |
Ben Lindstrom | 8a432f5 | 2001-03-05 07:24:46 +0000 | [diff] [blame] | 651 | /* |
| 652 | * Initialize "log" output. Since we are the client all output |
| 653 | * actually goes to stderr. |
| 654 | */ |
Darren Tucker | 72efd74 | 2009-06-21 17:48:00 +1000 | [diff] [blame] | 655 | log_init(argv0, |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 656 | options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
Damien Miller | e272a5b | 2008-11-03 19:22:37 +1100 | [diff] [blame] | 657 | SYSLOG_FACILITY_USER, !use_syslog); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 658 | |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 659 | /* |
| 660 | * Read per-user configuration file. Ignore the system wide config |
| 661 | * file if the user specifies a config file on the command line. |
| 662 | */ |
| 663 | if (config != NULL) { |
Damien Miller | 914420f | 2004-04-20 20:14:07 +1000 | [diff] [blame] | 664 | if (!read_config_file(config, host, &options, 0)) |
Ben Lindstrom | edc0cf2 | 2001-09-12 18:32:20 +0000 | [diff] [blame] | 665 | fatal("Can't open user config file %.100s: " |
| 666 | "%.100s", config, strerror(errno)); |
Damien Miller | 8016390 | 2007-01-05 16:30:16 +1100 | [diff] [blame] | 667 | } else { |
Darren Tucker | 199b134 | 2009-07-06 07:16:56 +1000 | [diff] [blame] | 668 | r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 669 | _PATH_SSH_USER_CONFFILE); |
Darren Tucker | 199b134 | 2009-07-06 07:16:56 +1000 | [diff] [blame] | 670 | if (r > 0 && (size_t)r < sizeof(buf)) |
| 671 | (void)read_config_file(buf, host, &options, 1); |
Ben Lindstrom | 83f07d1 | 2001-10-03 17:22:29 +0000 | [diff] [blame] | 672 | |
| 673 | /* Read systemwide configuration file after use config. */ |
Darren Tucker | fc95970 | 2004-07-17 16:12:08 +1000 | [diff] [blame] | 674 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, |
Damien Miller | 57a4476 | 2004-04-20 20:11:57 +1000 | [diff] [blame] | 675 | &options, 0); |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 676 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 677 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 678 | /* Fill configuration defaults. */ |
| 679 | fill_default_options(&options); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 680 | |
Darren Tucker | 0a4f04b | 2003-07-03 20:37:47 +1000 | [diff] [blame] | 681 | channel_set_af(options.address_family); |
| 682 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 683 | /* reinit */ |
Darren Tucker | 72efd74 | 2009-06-21 17:48:00 +1000 | [diff] [blame] | 684 | log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 685 | |
Damien Miller | 60bc517 | 2001-03-19 09:38:15 +1100 | [diff] [blame] | 686 | seed_rng(); |
| 687 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 688 | if (options.user == NULL) |
| 689 | options.user = xstrdup(pw->pw_name); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 690 | |
Darren Tucker | f6b01b7 | 2008-06-13 04:56:37 +1000 | [diff] [blame] | 691 | /* Get default port if port has not been set. */ |
| 692 | if (options.port == 0) { |
| 693 | sp = getservbyname(SSH_SERVICE_NAME, "tcp"); |
| 694 | options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT; |
| 695 | } |
| 696 | |
Damien Miller | d0244d4 | 2010-07-16 13:56:43 +1000 | [diff] [blame] | 697 | if (options.hostname != NULL) { |
| 698 | host = percent_expand(options.hostname, |
| 699 | "h", host, (char *)NULL); |
| 700 | } |
| 701 | |
Darren Tucker | f6b01b7 | 2008-06-13 04:56:37 +1000 | [diff] [blame] | 702 | if (options.local_command != NULL) { |
| 703 | char thishost[NI_MAXHOST]; |
| 704 | |
| 705 | if (gethostname(thishost, sizeof(thishost)) == -1) |
| 706 | fatal("gethostname: %s", strerror(errno)); |
| 707 | snprintf(buf, sizeof(buf), "%d", options.port); |
| 708 | debug3("expanding LocalCommand: %s", options.local_command); |
| 709 | cp = options.local_command; |
| 710 | options.local_command = percent_expand(cp, "d", pw->pw_dir, |
Damien Miller | d0244d4 | 2010-07-16 13:56:43 +1000 | [diff] [blame] | 711 | "h", host, "l", thishost, "n", host, "r", options.user, |
| 712 | "p", buf, "u", pw->pw_name, (char *)NULL); |
Darren Tucker | f6b01b7 | 2008-06-13 04:56:37 +1000 | [diff] [blame] | 713 | debug3("expanded LocalCommand: %s", options.local_command); |
| 714 | xfree(cp); |
| 715 | } |
| 716 | |
Darren Tucker | 3f521e2 | 2003-07-03 16:20:42 +1000 | [diff] [blame] | 717 | /* force lowercase for hostkey matching */ |
| 718 | if (options.host_key_alias != NULL) { |
| 719 | for (p = options.host_key_alias; *p; p++) |
| 720 | if (isupper(*p)) |
Damien Miller | 1d2b670 | 2006-03-26 14:09:54 +1100 | [diff] [blame] | 721 | *p = (char)tolower(*p); |
Darren Tucker | 3f521e2 | 2003-07-03 16:20:42 +1000 | [diff] [blame] | 722 | } |
| 723 | |
Damien Miller | 9f1e33a | 2003-02-24 11:57:32 +1100 | [diff] [blame] | 724 | if (options.proxy_command != NULL && |
Darren Tucker | 32e42c7 | 2007-12-02 23:01:03 +1100 | [diff] [blame] | 725 | strcmp(options.proxy_command, "none") == 0) { |
| 726 | xfree(options.proxy_command); |
Damien Miller | 9f1e33a | 2003-02-24 11:57:32 +1100 | [diff] [blame] | 727 | options.proxy_command = NULL; |
Darren Tucker | 32e42c7 | 2007-12-02 23:01:03 +1100 | [diff] [blame] | 728 | } |
Damien Miller | 8f74c8f | 2005-06-26 08:56:03 +1000 | [diff] [blame] | 729 | if (options.control_path != NULL && |
Darren Tucker | 32e42c7 | 2007-12-02 23:01:03 +1100 | [diff] [blame] | 730 | strcmp(options.control_path, "none") == 0) { |
| 731 | xfree(options.control_path); |
Damien Miller | 8f74c8f | 2005-06-26 08:56:03 +1000 | [diff] [blame] | 732 | options.control_path = NULL; |
Darren Tucker | 32e42c7 | 2007-12-02 23:01:03 +1100 | [diff] [blame] | 733 | } |
Damien Miller | 9f1e33a | 2003-02-24 11:57:32 +1100 | [diff] [blame] | 734 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 735 | if (options.control_path != NULL) { |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 736 | char thishost[NI_MAXHOST]; |
Damien Miller | 3ec54c7 | 2006-03-15 11:30:13 +1100 | [diff] [blame] | 737 | |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 738 | if (gethostname(thishost, sizeof(thishost)) == -1) |
Damien Miller | 3ec54c7 | 2006-03-15 11:30:13 +1100 | [diff] [blame] | 739 | fatal("gethostname: %s", strerror(errno)); |
Damien Miller | 6476cad | 2005-06-16 13:18:34 +1000 | [diff] [blame] | 740 | snprintf(buf, sizeof(buf), "%d", options.port); |
| 741 | cp = tilde_expand_filename(options.control_path, |
| 742 | original_real_uid); |
Darren Tucker | 32e42c7 | 2007-12-02 23:01:03 +1100 | [diff] [blame] | 743 | xfree(options.control_path); |
Damien Miller | 6476cad | 2005-06-16 13:18:34 +1000 | [diff] [blame] | 744 | options.control_path = percent_expand(cp, "p", buf, "h", host, |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 745 | "r", options.user, "l", thishost, (char *)NULL); |
Damien Miller | 6476cad | 2005-06-16 13:18:34 +1000 | [diff] [blame] | 746 | xfree(cp); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 747 | } |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 748 | if (muxclient_command != 0 && options.control_path == NULL) |
Darren Tucker | 0814d31 | 2005-06-01 23:08:51 +1000 | [diff] [blame] | 749 | fatal("No ControlPath specified for \"-O\" command"); |
Damien Miller | d14b1e7 | 2005-06-16 13:19:41 +1000 | [diff] [blame] | 750 | if (options.control_path != NULL) |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 751 | muxclient(options.control_path); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 752 | |
Damien Miller | 67bd062 | 2007-09-17 12:06:57 +1000 | [diff] [blame] | 753 | timeout_ms = options.connection_timeout * 1000; |
| 754 | |
Kevin Steves | fcec7f8 | 2000-12-15 19:55:48 +0000 | [diff] [blame] | 755 | /* Open a connection to the remote host. */ |
Darren Tucker | 0a4f04b | 2003-07-03 20:37:47 +1000 | [diff] [blame] | 756 | if (ssh_connect(host, &hostaddr, options.port, |
Damien Miller | 67bd062 | 2007-09-17 12:06:57 +1000 | [diff] [blame] | 757 | options.address_family, options.connection_attempts, &timeout_ms, |
| 758 | options.tcp_keep_alive, |
Ben Lindstrom | 1aa6427 | 2002-06-11 20:28:05 +0000 | [diff] [blame] | 759 | #ifdef HAVE_CYGWIN |
| 760 | options.use_privileged_port, |
| 761 | #else |
Ben Lindstrom | f9c4884 | 2002-06-11 16:37:51 +0000 | [diff] [blame] | 762 | original_effective_uid == 0 && options.use_privileged_port, |
Ben Lindstrom | 1aa6427 | 2002-06-11 20:28:05 +0000 | [diff] [blame] | 763 | #endif |
Ben Lindstrom | da394ca | 2002-06-12 16:11:12 +0000 | [diff] [blame] | 764 | options.proxy_command) != 0) |
Darren Tucker | e9a9b71 | 2005-12-20 16:15:51 +1100 | [diff] [blame] | 765 | exit(255); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 766 | |
Damien Miller | 67bd062 | 2007-09-17 12:06:57 +1000 | [diff] [blame] | 767 | if (timeout_ms > 0) |
| 768 | debug3("timeout: %d ms remain after connect", timeout_ms); |
| 769 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 770 | /* |
| 771 | * If we successfully made the connection, load the host private key |
| 772 | * in case we will need it later for combined rsa-rhosts |
| 773 | * authentication. This must be done before releasing extra |
| 774 | * privileges, because the file is only readable by root. |
Ben Lindstrom | 9e5bb57 | 2002-06-06 19:58:27 +0000 | [diff] [blame] | 775 | * If we cannot access the private keys, load the public keys |
| 776 | * instead and try to execute the ssh-keysign helper instead. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 777 | */ |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 778 | sensitive_data.nkeys = 0; |
| 779 | sensitive_data.keys = NULL; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 780 | sensitive_data.external_keysign = 0; |
Ben Lindstrom | 2415757 | 2002-06-12 16:09:39 +0000 | [diff] [blame] | 781 | if (options.rhosts_rsa_authentication || |
| 782 | options.hostbased_authentication) { |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 783 | sensitive_data.nkeys = 7; |
Damien Miller | ddd63ab | 2006-03-31 23:10:51 +1100 | [diff] [blame] | 784 | sensitive_data.keys = xcalloc(sensitive_data.nkeys, |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 785 | sizeof(Key)); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 786 | for (i = 0; i < sensitive_data.nkeys; i++) |
| 787 | sensitive_data.keys[i] = NULL; |
Ben Lindstrom | f9c4884 | 2002-06-11 16:37:51 +0000 | [diff] [blame] | 788 | |
| 789 | PRIV_START; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 790 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
Darren Tucker | 232b76f | 2006-05-06 17:41:51 +1000 | [diff] [blame] | 791 | _PATH_HOST_KEY_FILE, "", NULL, NULL); |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 792 | sensitive_data.keys[1] = key_load_private_cert(KEY_DSA, |
| 793 | _PATH_HOST_DSA_KEY_FILE, "", NULL); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 794 | #ifdef OPENSSL_HAS_ECC |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 795 | sensitive_data.keys[2] = key_load_private_cert(KEY_ECDSA, |
| 796 | _PATH_HOST_ECDSA_KEY_FILE, "", NULL); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 797 | #endif |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 798 | sensitive_data.keys[3] = key_load_private_cert(KEY_RSA, |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 799 | _PATH_HOST_RSA_KEY_FILE, "", NULL); |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 800 | sensitive_data.keys[4] = key_load_private_type(KEY_DSA, |
Darren Tucker | 232b76f | 2006-05-06 17:41:51 +1000 | [diff] [blame] | 801 | _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 802 | #ifdef OPENSSL_HAS_ECC |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 803 | sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA, |
| 804 | _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 805 | #endif |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 806 | sensitive_data.keys[6] = key_load_private_type(KEY_RSA, |
Darren Tucker | 232b76f | 2006-05-06 17:41:51 +1000 | [diff] [blame] | 807 | _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL); |
Ben Lindstrom | f9c4884 | 2002-06-11 16:37:51 +0000 | [diff] [blame] | 808 | PRIV_END; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 809 | |
Ben Lindstrom | 5d35a2f | 2002-07-04 00:19:40 +0000 | [diff] [blame] | 810 | if (options.hostbased_authentication == 1 && |
| 811 | sensitive_data.keys[0] == NULL && |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 812 | sensitive_data.keys[4] == NULL && |
| 813 | sensitive_data.keys[5] == NULL && |
| 814 | sensitive_data.keys[6] == NULL) { |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 815 | sensitive_data.keys[1] = key_load_cert( |
| 816 | _PATH_HOST_DSA_KEY_FILE); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 817 | #ifdef OPENSSL_HAS_ECC |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 818 | sensitive_data.keys[2] = key_load_cert( |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 819 | _PATH_HOST_ECDSA_KEY_FILE); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 820 | #endif |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 821 | sensitive_data.keys[3] = key_load_cert( |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 822 | _PATH_HOST_RSA_KEY_FILE); |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 823 | sensitive_data.keys[4] = key_load_public( |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 824 | _PATH_HOST_DSA_KEY_FILE, NULL); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 825 | #ifdef OPENSSL_HAS_ECC |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 826 | sensitive_data.keys[5] = key_load_public( |
| 827 | _PATH_HOST_ECDSA_KEY_FILE, NULL); |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 828 | #endif |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 829 | sensitive_data.keys[6] = key_load_public( |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 830 | _PATH_HOST_RSA_KEY_FILE, NULL); |
| 831 | sensitive_data.external_keysign = 1; |
| 832 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 833 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 834 | /* |
| 835 | * Get rid of any extra privileges that we may have. We will no |
| 836 | * longer need them. Also, extra privileges could make it very hard |
| 837 | * to read identity files and other non-world-readable files from the |
| 838 | * user's home directory if it happens to be on a NFS volume where |
| 839 | * root is mapped to nobody. |
| 840 | */ |
Darren Tucker | 25f60a7 | 2004-08-15 17:23:34 +1000 | [diff] [blame] | 841 | if (original_effective_uid == 0) { |
| 842 | PRIV_START; |
| 843 | permanently_set_uid(pw); |
| 844 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 845 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 846 | /* |
| 847 | * Now that we are back to our own permissions, create ~/.ssh |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 848 | * directory if it doesn't already exist. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 849 | */ |
Darren Tucker | 199b134 | 2009-07-06 07:16:56 +1000 | [diff] [blame] | 850 | r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir, |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 851 | strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
Darren Tucker | 8ccb739 | 2010-09-10 12:28:24 +1000 | [diff] [blame^] | 852 | if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) { |
| 853 | #ifdef WITH_SELINUX |
| 854 | char *scon; |
| 855 | |
| 856 | matchpathcon(buf, 0700, &scon); |
| 857 | setfscreatecon(scon); |
| 858 | #endif |
Damien Miller | be484b5 | 2000-07-15 14:14:16 +1000 | [diff] [blame] | 859 | if (mkdir(buf, 0700) < 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 860 | error("Could not create directory '%.200s'.", buf); |
Darren Tucker | 8ccb739 | 2010-09-10 12:28:24 +1000 | [diff] [blame^] | 861 | #ifdef WITH_SELINUX |
| 862 | setfscreatecon(NULL); |
| 863 | #endif |
| 864 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 865 | /* load options.identity_files */ |
| 866 | load_public_identity_files(); |
| 867 | |
| 868 | /* Expand ~ in known host file names. */ |
| 869 | /* XXX mem-leaks: */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 870 | options.system_hostfile = |
| 871 | tilde_expand_filename(options.system_hostfile, original_real_uid); |
| 872 | options.user_hostfile = |
| 873 | tilde_expand_filename(options.user_hostfile, original_real_uid); |
| 874 | options.system_hostfile2 = |
| 875 | tilde_expand_filename(options.system_hostfile2, original_real_uid); |
| 876 | options.user_hostfile2 = |
| 877 | tilde_expand_filename(options.user_hostfile2, original_real_uid); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 878 | |
Damien Miller | 07cd589 | 2001-11-12 10:52:03 +1100 | [diff] [blame] | 879 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
| 880 | |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 881 | /* Log into the remote system. Never returns if the login fails. */ |
Damien Miller | 67bd062 | 2007-09-17 12:06:57 +1000 | [diff] [blame] | 882 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, |
| 883 | pw, timeout_ms); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 884 | |
Damien Miller | 383ffe6 | 2010-06-26 10:02:03 +1000 | [diff] [blame] | 885 | if (packet_connection_is_on_socket()) { |
| 886 | verbose("Authenticated to %s ([%s]:%d).", host, |
| 887 | get_remote_ipaddr(), get_remote_port()); |
| 888 | } else { |
| 889 | verbose("Authenticated to %s (via proxy).", host); |
| 890 | } |
| 891 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 892 | /* We no longer need the private host keys. Clear them now. */ |
| 893 | if (sensitive_data.nkeys != 0) { |
| 894 | for (i = 0; i < sensitive_data.nkeys; i++) { |
| 895 | if (sensitive_data.keys[i] != NULL) { |
| 896 | /* Destroys contents safely */ |
| 897 | debug3("clear hostkey %d", i); |
| 898 | key_free(sensitive_data.keys[i]); |
| 899 | sensitive_data.keys[i] = NULL; |
| 900 | } |
| 901 | } |
| 902 | xfree(sensitive_data.keys); |
| 903 | } |
Ben Lindstrom | a6c8a8d | 2001-08-06 21:42:00 +0000 | [diff] [blame] | 904 | for (i = 0; i < options.num_identity_files; i++) { |
| 905 | if (options.identity_files[i]) { |
| 906 | xfree(options.identity_files[i]); |
| 907 | options.identity_files[i] = NULL; |
| 908 | } |
| 909 | if (options.identity_keys[i]) { |
| 910 | key_free(options.identity_keys[i]); |
| 911 | options.identity_keys[i] = NULL; |
| 912 | } |
| 913 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 914 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 915 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
| 916 | packet_close(); |
Damien Miller | 8c4e18a | 2002-09-19 12:05:02 +1000 | [diff] [blame] | 917 | |
Damien Miller | b1cbfa2 | 2008-05-19 16:00:08 +1000 | [diff] [blame] | 918 | if (options.control_path != NULL && muxserver_sock != -1) |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 919 | unlink(options.control_path); |
| 920 | |
Damien Miller | 8c4e18a | 2002-09-19 12:05:02 +1000 | [diff] [blame] | 921 | /* |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 922 | * Send SIGHUP to proxy command if used. We don't wait() in |
Damien Miller | 8c4e18a | 2002-09-19 12:05:02 +1000 | [diff] [blame] | 923 | * case it hangs and instead rely on init to reap the child |
| 924 | */ |
| 925 | if (proxy_command_pid > 1) |
| 926 | kill(proxy_command_pid, SIGHUP); |
| 927 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 928 | return exit_status; |
| 929 | } |
| 930 | |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 931 | static void |
| 932 | control_persist_detach(void) |
| 933 | { |
| 934 | pid_t pid; |
Damien Miller | 00d9ae2 | 2010-08-17 01:59:31 +1000 | [diff] [blame] | 935 | int devnull; |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 936 | |
| 937 | debug("%s: backgrounding master process", __func__); |
| 938 | |
| 939 | /* |
| 940 | * master (current process) into the background, and make the |
| 941 | * foreground process a client of the backgrounded master. |
| 942 | */ |
| 943 | switch ((pid = fork())) { |
| 944 | case -1: |
| 945 | fatal("%s: fork: %s", __func__, strerror(errno)); |
| 946 | case 0: |
| 947 | /* Child: master process continues mainloop */ |
| 948 | break; |
| 949 | default: |
| 950 | /* Parent: set up mux slave to connect to backgrounded master */ |
| 951 | debug2("%s: background process is %ld", __func__, (long)pid); |
| 952 | stdin_null_flag = ostdin_null_flag; |
| 953 | no_shell_flag = ono_shell_flag; |
| 954 | no_tty_flag = ono_tty_flag; |
| 955 | tty_flag = otty_flag; |
| 956 | close(muxserver_sock); |
| 957 | muxserver_sock = -1; |
Damien Miller | 5929c52 | 2010-09-10 11:17:02 +1000 | [diff] [blame] | 958 | options.control_master = SSHCTL_MASTER_NO; |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 959 | muxclient(options.control_path); |
| 960 | /* muxclient() doesn't return on success. */ |
| 961 | fatal("Failed to connect to new control master"); |
| 962 | } |
Damien Miller | 00d9ae2 | 2010-08-17 01:59:31 +1000 | [diff] [blame] | 963 | if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) { |
| 964 | error("%s: open(\"/dev/null\"): %s", __func__, |
| 965 | strerror(errno)); |
| 966 | } else { |
| 967 | if (dup2(devnull, STDIN_FILENO) == -1 || |
| 968 | dup2(devnull, STDOUT_FILENO) == -1) |
| 969 | error("%s: dup2: %s", __func__, strerror(errno)); |
| 970 | if (devnull > STDERR_FILENO) |
| 971 | close(devnull); |
| 972 | } |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 973 | } |
| 974 | |
| 975 | /* Do fork() after authentication. Used by "ssh -f" */ |
| 976 | static void |
| 977 | fork_postauth(void) |
| 978 | { |
| 979 | if (need_controlpersist_detach) |
| 980 | control_persist_detach(); |
| 981 | debug("forking to background"); |
| 982 | fork_after_authentication_flag = 0; |
| 983 | if (daemon(1, 1) < 0) |
| 984 | fatal("daemon() failed: %.200s", strerror(errno)); |
| 985 | } |
| 986 | |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 987 | /* Callback for remote forward global requests */ |
| 988 | static void |
| 989 | ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt) |
| 990 | { |
| 991 | Forward *rfwd = (Forward *)ctxt; |
| 992 | |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 993 | /* XXX verbose() on failure? */ |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 994 | debug("remote forward %s for: listen %d, connect %s:%d", |
| 995 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", |
| 996 | rfwd->listen_port, rfwd->connect_host, rfwd->connect_port); |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 997 | if (type == SSH2_MSG_REQUEST_SUCCESS && rfwd->listen_port == 0) { |
Damien Miller | 388f6fc | 2010-05-21 14:57:35 +1000 | [diff] [blame] | 998 | rfwd->allocated_port = packet_get_int(); |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 999 | logit("Allocated port %u for remote forward to %s:%d", |
Damien Miller | 388f6fc | 2010-05-21 14:57:35 +1000 | [diff] [blame] | 1000 | rfwd->allocated_port, |
| 1001 | rfwd->connect_host, rfwd->connect_port); |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 1002 | } |
| 1003 | |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1004 | if (type == SSH2_MSG_REQUEST_FAILURE) { |
| 1005 | if (options.exit_on_forward_failure) |
| 1006 | fatal("Error: remote port forwarding failed for " |
| 1007 | "listen port %d", rfwd->listen_port); |
| 1008 | else |
| 1009 | logit("Warning: remote port forwarding failed for " |
| 1010 | "listen port %d", rfwd->listen_port); |
| 1011 | } |
Darren Tucker | 9a2a609 | 2008-07-04 12:53:50 +1000 | [diff] [blame] | 1012 | if (++remote_forward_confirms_received == options.num_remote_forwards) { |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1013 | debug("All remote forwarding requests processed"); |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1014 | if (fork_after_authentication_flag) |
| 1015 | fork_postauth(); |
Darren Tucker | 9a2a609 | 2008-07-04 12:53:50 +1000 | [diff] [blame] | 1016 | } |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1017 | } |
| 1018 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1019 | static void |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1020 | client_cleanup_stdio_fwd(int id, void *arg) |
| 1021 | { |
| 1022 | debug("stdio forwarding: done"); |
| 1023 | cleanup_exit(0); |
| 1024 | } |
| 1025 | |
| 1026 | static int |
| 1027 | client_setup_stdio_fwd(const char *host_to_connect, u_short port_to_connect) |
| 1028 | { |
| 1029 | Channel *c; |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1030 | int in, out; |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1031 | |
| 1032 | debug3("client_setup_stdio_fwd %s:%d", host_to_connect, |
| 1033 | port_to_connect); |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1034 | |
| 1035 | in = dup(STDIN_FILENO); |
| 1036 | out = dup(STDOUT_FILENO); |
| 1037 | if (in < 0 || out < 0) |
| 1038 | fatal("channel_connect_stdio_fwd: dup() in/out failed"); |
| 1039 | |
| 1040 | if ((c = channel_connect_stdio_fwd(host_to_connect, port_to_connect, |
| 1041 | in, out)) == NULL) |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1042 | return 0; |
| 1043 | channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0); |
| 1044 | return 1; |
| 1045 | } |
| 1046 | |
| 1047 | static void |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1048 | ssh_init_forwarding(void) |
| 1049 | { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1050 | int success = 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1051 | int i; |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1052 | |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1053 | if (stdio_forward_host != NULL) { |
| 1054 | if (!compat20) { |
| 1055 | fatal("stdio forwarding require Protocol 2"); |
| 1056 | } |
| 1057 | if (!client_setup_stdio_fwd(stdio_forward_host, |
| 1058 | stdio_forward_port)) |
| 1059 | fatal("Failed to connect in stdio forward mode."); |
| 1060 | } |
| 1061 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1062 | /* Initiate local TCP/IP port forwardings. */ |
| 1063 | for (i = 0; i < options.num_local_forwards; i++) { |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1064 | debug("Local connections to %.200s:%d forwarded to remote " |
| 1065 | "address %.200s:%d", |
Darren Tucker | 47eede7 | 2005-03-14 23:08:12 +1100 | [diff] [blame] | 1066 | (options.local_forwards[i].listen_host == NULL) ? |
| 1067 | (options.gateway_ports ? "*" : "LOCALHOST") : |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1068 | options.local_forwards[i].listen_host, |
| 1069 | options.local_forwards[i].listen_port, |
| 1070 | options.local_forwards[i].connect_host, |
| 1071 | options.local_forwards[i].connect_port); |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 1072 | success += channel_setup_local_fwd_listener( |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1073 | options.local_forwards[i].listen_host, |
| 1074 | options.local_forwards[i].listen_port, |
| 1075 | options.local_forwards[i].connect_host, |
| 1076 | options.local_forwards[i].connect_port, |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1077 | options.gateway_ports); |
| 1078 | } |
Darren Tucker | e7d4b19 | 2006-07-12 22:17:10 +1000 | [diff] [blame] | 1079 | if (i > 0 && success != i && options.exit_on_forward_failure) |
| 1080 | fatal("Could not request local forwarding."); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1081 | if (i > 0 && success == 0) |
| 1082 | error("Could not request local forwarding."); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1083 | |
| 1084 | /* Initiate remote TCP/IP port forwardings. */ |
| 1085 | for (i = 0; i < options.num_remote_forwards; i++) { |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1086 | debug("Remote connections from %.200s:%d forwarded to " |
| 1087 | "local address %.200s:%d", |
Damien Miller | 46d38de | 2005-07-17 17:02:09 +1000 | [diff] [blame] | 1088 | (options.remote_forwards[i].listen_host == NULL) ? |
Damien Miller | aa3bb10 | 2005-11-05 15:12:59 +1100 | [diff] [blame] | 1089 | "LOCALHOST" : options.remote_forwards[i].listen_host, |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1090 | options.remote_forwards[i].listen_port, |
| 1091 | options.remote_forwards[i].connect_host, |
| 1092 | options.remote_forwards[i].connect_port); |
Darren Tucker | e7d4b19 | 2006-07-12 22:17:10 +1000 | [diff] [blame] | 1093 | if (channel_request_remote_forwarding( |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 1094 | options.remote_forwards[i].listen_host, |
| 1095 | options.remote_forwards[i].listen_port, |
| 1096 | options.remote_forwards[i].connect_host, |
Darren Tucker | e7d4b19 | 2006-07-12 22:17:10 +1000 | [diff] [blame] | 1097 | options.remote_forwards[i].connect_port) < 0) { |
| 1098 | if (options.exit_on_forward_failure) |
| 1099 | fatal("Could not request remote forwarding."); |
| 1100 | else |
| 1101 | logit("Warning: Could not request remote " |
| 1102 | "forwarding."); |
| 1103 | } |
Darren Tucker | 9f407c4 | 2008-06-13 04:50:27 +1000 | [diff] [blame] | 1104 | client_register_global_confirm(ssh_confirm_remote_forward, |
| 1105 | &options.remote_forwards[i]); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1106 | } |
Damien Miller | b3ce9fe | 2007-08-08 14:32:41 +1000 | [diff] [blame] | 1107 | |
| 1108 | /* Initiate tunnel forwarding. */ |
| 1109 | if (options.tun_open != SSH_TUNMODE_NO) { |
| 1110 | if (client_request_tun_fwd(options.tun_open, |
| 1111 | options.tun_local, options.tun_remote) == -1) { |
| 1112 | if (options.exit_on_forward_failure) |
| 1113 | fatal("Could not request tunnel forwarding."); |
| 1114 | else |
| 1115 | error("Could not request tunnel forwarding."); |
| 1116 | } |
| 1117 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1118 | } |
| 1119 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1120 | static void |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1121 | check_agent_present(void) |
| 1122 | { |
| 1123 | if (options.forward_agent) { |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 1124 | /* Clear agent forwarding if we don't have an agent. */ |
Damien Miller | 789e95d | 2002-09-12 09:52:46 +1000 | [diff] [blame] | 1125 | if (!ssh_agent_present()) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1126 | options.forward_agent = 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1127 | } |
| 1128 | } |
| 1129 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1130 | static int |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1131 | ssh_session(void) |
| 1132 | { |
| 1133 | int type; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1134 | int interactive = 0; |
| 1135 | int have_tty = 0; |
| 1136 | struct winsize ws; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1137 | char *cp; |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1138 | const char *display; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1139 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1140 | /* Enable compression if requested. */ |
| 1141 | if (options.compression) { |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1142 | debug("Requesting compression at level %d.", |
| 1143 | options.compression_level); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1144 | |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1145 | if (options.compression_level < 1 || |
| 1146 | options.compression_level > 9) |
| 1147 | fatal("Compression level must be from 1 (fast) to " |
| 1148 | "9 (slow, best)."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1149 | |
| 1150 | /* Send the request. */ |
| 1151 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); |
| 1152 | packet_put_int(options.compression_level); |
| 1153 | packet_send(); |
| 1154 | packet_write_wait(); |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 1155 | type = packet_read(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1156 | if (type == SSH_SMSG_SUCCESS) |
| 1157 | packet_start_compression(options.compression_level); |
| 1158 | else if (type == SSH_SMSG_FAILURE) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1159 | logit("Warning: Remote host refused compression."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1160 | else |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1161 | packet_disconnect("Protocol error waiting for " |
| 1162 | "compression response."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1163 | } |
| 1164 | /* Allocate a pseudo tty if appropriate. */ |
| 1165 | if (tty_flag) { |
| 1166 | debug("Requesting pty."); |
| 1167 | |
| 1168 | /* Start the packet. */ |
| 1169 | packet_start(SSH_CMSG_REQUEST_PTY); |
| 1170 | |
| 1171 | /* Store TERM in the packet. There is no limit on the |
| 1172 | length of the string. */ |
| 1173 | cp = getenv("TERM"); |
| 1174 | if (!cp) |
| 1175 | cp = ""; |
Ben Lindstrom | 664408d | 2001-06-09 01:42:01 +0000 | [diff] [blame] | 1176 | packet_put_cstring(cp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1177 | |
| 1178 | /* Store window size in the packet. */ |
| 1179 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
| 1180 | memset(&ws, 0, sizeof(ws)); |
Damien Miller | 71a7367 | 2006-03-26 14:04:36 +1100 | [diff] [blame] | 1181 | packet_put_int((u_int)ws.ws_row); |
| 1182 | packet_put_int((u_int)ws.ws_col); |
| 1183 | packet_put_int((u_int)ws.ws_xpixel); |
| 1184 | packet_put_int((u_int)ws.ws_ypixel); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1185 | |
| 1186 | /* Store tty modes in the packet. */ |
Ben Lindstrom | ae8e2d3 | 2001-04-14 23:13:02 +0000 | [diff] [blame] | 1187 | tty_make_modes(fileno(stdin), NULL); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1188 | |
| 1189 | /* Send the packet, and wait for it to leave. */ |
| 1190 | packet_send(); |
| 1191 | packet_write_wait(); |
| 1192 | |
| 1193 | /* Read response from the server. */ |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 1194 | type = packet_read(); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 1195 | if (type == SSH_SMSG_SUCCESS) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1196 | interactive = 1; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1197 | have_tty = 1; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 1198 | } else if (type == SSH_SMSG_FAILURE) |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1199 | logit("Warning: Remote host failed or refused to " |
| 1200 | "allocate a pseudo tty."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1201 | else |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1202 | packet_disconnect("Protocol error waiting for pty " |
| 1203 | "request response."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1204 | } |
| 1205 | /* Request X11 forwarding if enabled and DISPLAY is set. */ |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1206 | display = getenv("DISPLAY"); |
| 1207 | if (options.forward_x11 && display != NULL) { |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 1208 | char *proto, *data; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1209 | /* Get reasonable local authentication information. */ |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1210 | client_x11_get_proto(display, options.xauth_location, |
Damien Miller | 1ab6a51 | 2010-06-26 10:02:24 +1000 | [diff] [blame] | 1211 | options.forward_x11_trusted, |
| 1212 | options.forward_x11_timeout, |
| 1213 | &proto, &data); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1214 | /* Request forwarding with authentication spoofing. */ |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1215 | debug("Requesting X11 forwarding with authentication " |
| 1216 | "spoofing."); |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1217 | x11_request_forwarding_with_spoofing(0, display, proto, data); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1218 | |
| 1219 | /* Read response from the server. */ |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 1220 | type = packet_read(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1221 | if (type == SSH_SMSG_SUCCESS) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1222 | interactive = 1; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1223 | } else if (type == SSH_SMSG_FAILURE) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1224 | logit("Warning: Remote host denied X11 forwarding."); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1225 | } else { |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1226 | packet_disconnect("Protocol error waiting for X11 " |
| 1227 | "forwarding"); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1228 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1229 | } |
| 1230 | /* Tell the packet module whether this is an interactive session. */ |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 1231 | packet_set_interactive(interactive); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1232 | |
| 1233 | /* Request authentication agent forwarding if appropriate. */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1234 | check_agent_present(); |
| 1235 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1236 | if (options.forward_agent) { |
| 1237 | debug("Requesting authentication agent forwarding."); |
| 1238 | auth_request_forwarding(); |
| 1239 | |
| 1240 | /* Read response from the server. */ |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 1241 | type = packet_read(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1242 | packet_check_eom(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1243 | if (type != SSH_SMSG_SUCCESS) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1244 | logit("Warning: Remote host denied authentication agent forwarding."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1245 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1246 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1247 | /* Initiate port forwardings. */ |
| 1248 | ssh_init_forwarding(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1249 | |
Darren Tucker | b776c85 | 2007-12-02 23:06:35 +1100 | [diff] [blame] | 1250 | /* Execute a local command */ |
| 1251 | if (options.local_command != NULL && |
| 1252 | options.permit_local_command) |
| 1253 | ssh_local_cmd(options.local_command); |
| 1254 | |
Darren Tucker | 9a2a609 | 2008-07-04 12:53:50 +1000 | [diff] [blame] | 1255 | /* |
| 1256 | * If requested and we are not interested in replies to remote |
| 1257 | * forwarding requests, then let ssh continue in the background. |
| 1258 | */ |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1259 | if (fork_after_authentication_flag) { |
| 1260 | if (options.exit_on_forward_failure && |
| 1261 | options.num_remote_forwards > 0) { |
| 1262 | debug("deferring postauth fork until remote forward " |
| 1263 | "confirmation received"); |
| 1264 | } else |
| 1265 | fork_postauth(); |
Darren Tucker | 9a2a609 | 2008-07-04 12:53:50 +1000 | [diff] [blame] | 1266 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1267 | |
| 1268 | /* |
| 1269 | * If a command was specified on the command line, execute the |
| 1270 | * command now. Otherwise request the server to start a shell. |
| 1271 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1272 | if (buffer_len(&command) > 0) { |
| 1273 | int len = buffer_len(&command); |
| 1274 | if (len > 900) |
| 1275 | len = 900; |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1276 | debug("Sending command: %.*s", len, |
| 1277 | (u_char *)buffer_ptr(&command)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1278 | packet_start(SSH_CMSG_EXEC_CMD); |
| 1279 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
| 1280 | packet_send(); |
| 1281 | packet_write_wait(); |
| 1282 | } else { |
| 1283 | debug("Requesting shell."); |
| 1284 | packet_start(SSH_CMSG_EXEC_SHELL); |
| 1285 | packet_send(); |
| 1286 | packet_write_wait(); |
| 1287 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1288 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1289 | /* Enter the interactive session. */ |
Ben Lindstrom | 2b1f71b | 2001-06-05 20:32:21 +0000 | [diff] [blame] | 1290 | return client_loop(have_tty, tty_flag ? |
| 1291 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1292 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1293 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1294 | /* request pty/x11/agent/tcpfwd/shell for channel */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1295 | static void |
Damien Miller | d530f5f | 2010-05-21 14:57:10 +1000 | [diff] [blame] | 1296 | ssh_session2_setup(int id, int success, void *arg) |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1297 | { |
Damien Miller | 3756dce | 2004-06-18 01:17:29 +1000 | [diff] [blame] | 1298 | extern char **environ; |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1299 | const char *display; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1300 | int interactive = tty_flag; |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1301 | |
Damien Miller | d530f5f | 2010-05-21 14:57:10 +1000 | [diff] [blame] | 1302 | if (!success) |
| 1303 | return; /* No need for error message, channels code sens one */ |
| 1304 | |
Damien Miller | 46d38de | 2005-07-17 17:02:09 +1000 | [diff] [blame] | 1305 | display = getenv("DISPLAY"); |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1306 | if (options.forward_x11 && display != NULL) { |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 1307 | char *proto, *data; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1308 | /* Get reasonable local authentication information. */ |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1309 | client_x11_get_proto(display, options.xauth_location, |
Damien Miller | 1ab6a51 | 2010-06-26 10:02:24 +1000 | [diff] [blame] | 1310 | options.forward_x11_trusted, |
| 1311 | options.forward_x11_timeout, &proto, &data); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1312 | /* Request forwarding with authentication spoofing. */ |
Darren Tucker | d6173c0 | 2008-06-13 04:52:53 +1000 | [diff] [blame] | 1313 | debug("Requesting X11 forwarding with authentication " |
| 1314 | "spoofing."); |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 1315 | x11_request_forwarding_with_spoofing(id, display, proto, data); |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 1316 | interactive = 1; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1317 | /* XXX wait for reply */ |
| 1318 | } |
| 1319 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1320 | check_agent_present(); |
| 1321 | if (options.forward_agent) { |
| 1322 | debug("Requesting authentication agent forwarding."); |
| 1323 | channel_request_start(id, "auth-agent-req@openssh.com", 0); |
| 1324 | packet_send(); |
| 1325 | } |
| 1326 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1327 | client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), |
Damien Miller | 5771ed7 | 2008-05-19 15:35:33 +1000 | [diff] [blame] | 1328 | NULL, fileno(stdin), &command, environ); |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 1329 | |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 1330 | packet_set_interactive(interactive); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1331 | } |
| 1332 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1333 | /* open new channel for a session */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1334 | static int |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1335 | ssh_session2_open(void) |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1336 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1337 | Channel *c; |
| 1338 | int window, packetmax, in, out, err; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1339 | |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 1340 | if (stdin_null_flag) { |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1341 | in = open(_PATH_DEVNULL, O_RDONLY); |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 1342 | } else { |
| 1343 | in = dup(STDIN_FILENO); |
| 1344 | } |
| 1345 | out = dup(STDOUT_FILENO); |
| 1346 | err = dup(STDERR_FILENO); |
| 1347 | |
| 1348 | if (in < 0 || out < 0 || err < 0) |
| 1349 | fatal("dup() in/out/err failed"); |
| 1350 | |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 1351 | /* enable nonblocking unless tty */ |
| 1352 | if (!isatty(in)) |
| 1353 | set_nonblock(in); |
| 1354 | if (!isatty(out)) |
| 1355 | set_nonblock(out); |
| 1356 | if (!isatty(err)) |
| 1357 | set_nonblock(err); |
| 1358 | |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1359 | window = CHAN_SES_WINDOW_DEFAULT; |
| 1360 | packetmax = CHAN_SES_PACKET_DEFAULT; |
Damien Miller | 19a5945 | 2002-02-19 15:20:57 +1100 | [diff] [blame] | 1361 | if (tty_flag) { |
| 1362 | window >>= 1; |
| 1363 | packetmax >>= 1; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1364 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1365 | c = channel_new( |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1366 | "session", SSH_CHANNEL_OPENING, in, out, err, |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1367 | window, packetmax, CHAN_EXTENDED_WRITE, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1368 | "client-session", /*nonblock*/0); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1369 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1370 | debug3("ssh_session2_open: channel_new: %d", c->self); |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1371 | |
Ben Lindstrom | 5ec2645 | 2001-06-09 00:18:51 +0000 | [diff] [blame] | 1372 | channel_send_open(c->self); |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1373 | if (!no_shell_flag) |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 1374 | channel_register_open_confirm(c->self, |
| 1375 | ssh_session2_setup, NULL); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1376 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1377 | return c->self; |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1378 | } |
| 1379 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1380 | static int |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1381 | ssh_session2(void) |
| 1382 | { |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1383 | int id = -1; |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1384 | |
| 1385 | /* XXX should be pre-session */ |
| 1386 | ssh_init_forwarding(); |
| 1387 | |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1388 | /* Start listening for multiplex clients */ |
| 1389 | muxserver_listen(); |
| 1390 | |
| 1391 | /* |
| 1392 | * If we are in control persist mode, then prepare to background |
| 1393 | * ourselves and have a foreground client attach as a control |
| 1394 | * slave. NB. we must save copies of the flags that we override for |
| 1395 | * the backgrounding, since we defer attachment of the slave until |
| 1396 | * after the connection is fully established (in particular, |
| 1397 | * async rfwd replies have been received for ExitOnForwardFailure). |
| 1398 | */ |
| 1399 | if (options.control_persist && muxserver_sock != -1) { |
| 1400 | ostdin_null_flag = stdin_null_flag; |
| 1401 | ono_shell_flag = no_shell_flag; |
| 1402 | ono_tty_flag = no_tty_flag; |
| 1403 | otty_flag = tty_flag; |
| 1404 | stdin_null_flag = 1; |
| 1405 | no_shell_flag = 1; |
| 1406 | no_tty_flag = 1; |
| 1407 | tty_flag = 0; |
| 1408 | if (!fork_after_authentication_flag) |
| 1409 | need_controlpersist_detach = 1; |
| 1410 | fork_after_authentication_flag = 1; |
| 1411 | } |
| 1412 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1413 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
| 1414 | id = ssh_session2_open(); |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1415 | |
Darren Tucker | 8901fa9 | 2008-06-11 09:34:01 +1000 | [diff] [blame] | 1416 | /* 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] | 1417 | if (options.control_master == SSHCTL_MASTER_NO && |
| 1418 | (datafellows & SSH_NEW_OPENSSH)) { |
Darren Tucker | 8901fa9 | 2008-06-11 09:34:01 +1000 | [diff] [blame] | 1419 | debug("Requesting no-more-sessions@openssh.com"); |
| 1420 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 1421 | packet_put_cstring("no-more-sessions@openssh.com"); |
| 1422 | packet_put_char(0); |
| 1423 | packet_send(); |
| 1424 | } |
| 1425 | |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1426 | /* Execute a local command */ |
| 1427 | if (options.local_command != NULL && |
| 1428 | options.permit_local_command) |
| 1429 | ssh_local_cmd(options.local_command); |
| 1430 | |
Damien Miller | 1f25ab4 | 2010-07-16 13:56:23 +1000 | [diff] [blame] | 1431 | /* |
| 1432 | * If requested and we are not interested in replies to remote |
| 1433 | * forwarding requests, then let ssh continue in the background. |
| 1434 | */ |
Damien Miller | e11e1ea | 2010-08-03 16:04:46 +1000 | [diff] [blame] | 1435 | if (fork_after_authentication_flag) { |
| 1436 | if (options.exit_on_forward_failure && |
| 1437 | options.num_remote_forwards > 0) { |
| 1438 | debug("deferring postauth fork until remote forward " |
| 1439 | "confirmation received"); |
| 1440 | } else |
| 1441 | fork_postauth(); |
Darren Tucker | 9a2a609 | 2008-07-04 12:53:50 +1000 | [diff] [blame] | 1442 | } |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1443 | |
Darren Tucker | f1de4e5 | 2010-01-08 16:54:59 +1100 | [diff] [blame] | 1444 | if (options.use_roaming) |
| 1445 | request_roaming(); |
| 1446 | |
Ben Lindstrom | 2b1f71b | 2001-06-05 20:32:21 +0000 | [diff] [blame] | 1447 | return client_loop(tty_flag, tty_flag ? |
| 1448 | options.escape_char : SSH_ESCAPECHAR_NONE, id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1449 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1450 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1451 | static void |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1452 | load_public_identity_files(void) |
| 1453 | { |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 1454 | char *filename, *cp, thishost[NI_MAXHOST]; |
Darren Tucker | b4fbbc6 | 2007-12-02 23:16:32 +1100 | [diff] [blame] | 1455 | char *pwdir = NULL, *pwname = NULL; |
Ben Lindstrom | 711b04a | 2001-08-06 21:12:42 +0000 | [diff] [blame] | 1456 | int i = 0; |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1457 | Key *public; |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 1458 | struct passwd *pw; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1459 | u_int n_ids; |
| 1460 | char *identity_files[SSH_MAX_IDENTITY_FILES]; |
| 1461 | Key *identity_keys[SSH_MAX_IDENTITY_FILES]; |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1462 | #ifdef ENABLE_PKCS11 |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1463 | Key **keys; |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1464 | int nkeys; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1465 | #endif /* PKCS11 */ |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1466 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1467 | n_ids = 0; |
| 1468 | bzero(identity_files, sizeof(identity_files)); |
| 1469 | bzero(identity_keys, sizeof(identity_keys)); |
| 1470 | |
| 1471 | #ifdef ENABLE_PKCS11 |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1472 | if (options.pkcs11_provider != NULL && |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1473 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1474 | (pkcs11_init(!options.batch_mode) == 0) && |
| 1475 | (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL, |
| 1476 | &keys)) > 0) { |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1477 | for (i = 0; i < nkeys; i++) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1478 | if (n_ids >= SSH_MAX_IDENTITY_FILES) { |
| 1479 | key_free(keys[i]); |
| 1480 | continue; |
| 1481 | } |
| 1482 | identity_keys[n_ids] = keys[i]; |
| 1483 | identity_files[n_ids] = |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1484 | xstrdup(options.pkcs11_provider); /* XXX */ |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1485 | n_ids++; |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1486 | } |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1487 | xfree(keys); |
Ben Lindstrom | 711b04a | 2001-08-06 21:12:42 +0000 | [diff] [blame] | 1488 | } |
Damien Miller | 7ea845e | 2010-02-12 09:21:02 +1100 | [diff] [blame] | 1489 | #endif /* ENABLE_PKCS11 */ |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 1490 | if ((pw = getpwuid(original_real_uid)) == NULL) |
| 1491 | fatal("load_public_identity_files: getpwuid failed"); |
Darren Tucker | e143f06 | 2007-12-02 23:21:16 +1100 | [diff] [blame] | 1492 | pwname = xstrdup(pw->pw_name); |
| 1493 | pwdir = xstrdup(pw->pw_dir); |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 1494 | if (gethostname(thishost, sizeof(thishost)) == -1) |
| 1495 | fatal("load_public_identity_files: gethostname: %s", |
| 1496 | strerror(errno)); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1497 | for (i = 0; i < options.num_identity_files; i++) { |
| 1498 | if (n_ids >= SSH_MAX_IDENTITY_FILES) { |
| 1499 | xfree(options.identity_files[i]); |
| 1500 | continue; |
| 1501 | } |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 1502 | cp = tilde_expand_filename(options.identity_files[i], |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1503 | original_real_uid); |
Darren Tucker | b4fbbc6 | 2007-12-02 23:16:32 +1100 | [diff] [blame] | 1504 | filename = percent_expand(cp, "d", pwdir, |
| 1505 | "u", pwname, "l", thishost, "h", host, |
Damien Miller | 6b1d53c | 2006-03-31 23:13:21 +1100 | [diff] [blame] | 1506 | "r", options.user, (char *)NULL); |
| 1507 | xfree(cp); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 1508 | public = key_load_public(filename, NULL); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1509 | debug("identity file %s type %d", filename, |
| 1510 | public ? public->type : -1); |
| 1511 | xfree(options.identity_files[i]); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1512 | identity_files[n_ids] = filename; |
| 1513 | identity_keys[n_ids] = public; |
| 1514 | |
| 1515 | if (++n_ids >= SSH_MAX_IDENTITY_FILES) |
| 1516 | continue; |
| 1517 | |
| 1518 | /* Try to add the certificate variant too */ |
| 1519 | xasprintf(&cp, "%s-cert", filename); |
| 1520 | public = key_load_public(cp, NULL); |
| 1521 | debug("identity file %s type %d", cp, |
| 1522 | public ? public->type : -1); |
| 1523 | if (public == NULL) { |
| 1524 | xfree(cp); |
| 1525 | continue; |
| 1526 | } |
| 1527 | if (!key_is_cert(public)) { |
| 1528 | debug("%s: key %s type %s is not a certificate", |
| 1529 | __func__, cp, key_type(public)); |
| 1530 | key_free(public); |
| 1531 | xfree(cp); |
| 1532 | continue; |
| 1533 | } |
| 1534 | identity_keys[n_ids] = public; |
| 1535 | /* point to the original path, most likely the private key */ |
| 1536 | identity_files[n_ids] = xstrdup(filename); |
| 1537 | n_ids++; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1538 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1539 | options.num_identity_files = n_ids; |
| 1540 | memcpy(options.identity_files, identity_files, sizeof(identity_files)); |
| 1541 | memcpy(options.identity_keys, identity_keys, sizeof(identity_keys)); |
| 1542 | |
Darren Tucker | b4fbbc6 | 2007-12-02 23:16:32 +1100 | [diff] [blame] | 1543 | bzero(pwname, strlen(pwname)); |
Darren Tucker | e143f06 | 2007-12-02 23:21:16 +1100 | [diff] [blame] | 1544 | xfree(pwname); |
Darren Tucker | b4fbbc6 | 2007-12-02 23:16:32 +1100 | [diff] [blame] | 1545 | bzero(pwdir, strlen(pwdir)); |
Darren Tucker | e143f06 | 2007-12-02 23:21:16 +1100 | [diff] [blame] | 1546 | xfree(pwdir); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1547 | } |