Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 4 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 5 | * Ssh client program. This program can be used to log into a remote machine. |
| 6 | * The software supports strong authentication, encryption, and forwarding |
| 7 | * of X11, TCP/IP, and authentication connections. |
| 8 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 9 | * As far as I am concerned, the code I have written for this software |
| 10 | * can be used freely for any purpose. Any derived versions of this |
| 11 | * software must be clearly marked as such, and if the derived work is |
| 12 | * incompatible with the protocol description in the RFC file, it must be |
| 13 | * called by a name other than "ssh" or "Secure Shell". |
| 14 | * |
| 15 | * Copyright (c) 1999 Niels Provos. All rights reserved. |
Darren Tucker | 0a118da | 2003-10-15 15:54:32 +1000 | [diff] [blame] | 16 | * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 17 | * |
| 18 | * Modified to work with SSL by Niels Provos <provos@citi.umich.edu> |
| 19 | * in Canada (German citizen). |
| 20 | * |
| 21 | * Redistribution and use in source and binary forms, with or without |
| 22 | * modification, are permitted provided that the following conditions |
| 23 | * are met: |
| 24 | * 1. Redistributions of source code must retain the above copyright |
| 25 | * notice, this list of conditions and the following disclaimer. |
| 26 | * 2. Redistributions in binary form must reproduce the above copyright |
| 27 | * notice, this list of conditions and the following disclaimer in the |
| 28 | * documentation and/or other materials provided with the distribution. |
| 29 | * |
| 30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 40 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 41 | |
| 42 | #include "includes.h" |
Darren Tucker | 27a8f6b | 2004-08-29 16:31:28 +1000 | [diff] [blame] | 43 | RCSID("$OpenBSD: ssh.c,v 1.225 2004/08/23 14:26:38 dtucker Exp $"); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 44 | |
| 45 | #include <openssl/evp.h> |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 46 | #include <openssl/err.h> |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 47 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 48 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 49 | #include "ssh1.h" |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 50 | #include "ssh2.h" |
| 51 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 52 | #include "cipher.h" |
| 53 | #include "xmalloc.h" |
| 54 | #include "packet.h" |
| 55 | #include "buffer.h" |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 56 | #include "bufaux.h" |
Ben Lindstrom | c763767 | 2001-06-09 00:36:26 +0000 | [diff] [blame] | 57 | #include "channels.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 58 | #include "key.h" |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 59 | #include "authfd.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 60 | #include "authfile.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 61 | #include "pathnames.h" |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 62 | #include "dispatch.h" |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 63 | #include "clientloop.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 64 | #include "log.h" |
| 65 | #include "readconf.h" |
| 66 | #include "sshconnect.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 67 | #include "misc.h" |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 68 | #include "kex.h" |
| 69 | #include "mac.h" |
Darren Tucker | 06f2bd8 | 2004-05-13 16:06:46 +1000 | [diff] [blame] | 70 | #include "sshpty.h" |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 71 | #include "match.h" |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 72 | #include "msg.h" |
| 73 | #include "monitor_fdpass.h" |
Darren Tucker | 25f60a7 | 2004-08-15 17:23:34 +1000 | [diff] [blame] | 74 | #include "uidswap.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 75 | |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 76 | #ifdef SMARTCARD |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 77 | #include "scard.h" |
Ben Lindstrom | bcc1808 | 2001-08-06 21:59:25 +0000 | [diff] [blame] | 78 | #endif |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 79 | |
Damien Miller | 3f90587 | 1999-11-15 17:10:57 +1100 | [diff] [blame] | 80 | extern char *__progname; |
Damien Miller | 3f90587 | 1999-11-15 17:10:57 +1100 | [diff] [blame] | 81 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 82 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 83 | int debug_flag = 0; |
| 84 | |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 85 | /* Flag indicating whether a tty should be allocated */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 86 | int tty_flag = 0; |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 87 | int no_tty_flag = 0; |
| 88 | int force_tty_flag = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 89 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 90 | /* don't exec a shell */ |
| 91 | int no_shell_flag = 0; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 92 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 93 | /* |
| 94 | * Flag indicating that nothing should be read from stdin. This can be set |
| 95 | * on the command line. |
| 96 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 97 | int stdin_null_flag = 0; |
| 98 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 99 | /* |
| 100 | * Flag indicating that ssh should fork after authentication. This is useful |
Ben Lindstrom | f666fec | 2002-06-06 19:51:58 +0000 | [diff] [blame] | 101 | * 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] | 102 | * background. |
| 103 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 104 | int fork_after_authentication_flag = 0; |
| 105 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 106 | /* |
| 107 | * General data structure for command line options and options configurable |
| 108 | * in configuration files. See readconf.h. |
| 109 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 110 | Options options; |
| 111 | |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 112 | /* optional user configfile */ |
| 113 | char *config = NULL; |
| 114 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 115 | /* |
| 116 | * Name of the host we are connecting to. This is the name given on the |
| 117 | * command line, or the HostName specified for the user-supplied name in a |
| 118 | * configuration file. |
| 119 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 120 | char *host; |
| 121 | |
| 122 | /* socket address the host resolves to */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 123 | struct sockaddr_storage hostaddr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 124 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 125 | /* Private host keys. */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 126 | Sensitive sensitive_data; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 127 | |
| 128 | /* Original real UID. */ |
| 129 | uid_t original_real_uid; |
Ben Lindstrom | f9c4884 | 2002-06-11 16:37:51 +0000 | [diff] [blame] | 130 | uid_t original_effective_uid; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 131 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 132 | /* command to be executed */ |
| 133 | Buffer command; |
| 134 | |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 135 | /* Should we execute a command or invoke a subsystem? */ |
| 136 | int subsystem_flag = 0; |
| 137 | |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame] | 138 | /* # of replies received for global requests */ |
| 139 | static int client_global_request_id = 0; |
| 140 | |
Damien Miller | 8c4e18a | 2002-09-19 12:05:02 +1000 | [diff] [blame] | 141 | /* pid of proxycommand child process */ |
| 142 | pid_t proxy_command_pid = 0; |
| 143 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 144 | /* fd to control socket */ |
| 145 | int control_fd = -1; |
| 146 | |
| 147 | /* Only used in control client mode */ |
| 148 | volatile sig_atomic_t control_client_terminate = 0; |
| 149 | u_int control_server_pid = 0; |
| 150 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 151 | /* Prints a help message to the user. This function never returns. */ |
| 152 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 153 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 154 | usage(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 155 | { |
Damien Miller | 5095510 | 2004-03-22 09:34:58 +1100 | [diff] [blame] | 156 | fprintf(stderr, |
Darren Tucker | ba5c592 | 2004-06-18 16:22:39 +1000 | [diff] [blame] | 157 | "usage: ssh [-1246AaCfghkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n" |
Damien Miller | 5095510 | 2004-03-22 09:34:58 +1100 | [diff] [blame] | 158 | " [-D port] [-e escape_char] [-F configfile] [-i identity_file]\n" |
| 159 | " [-L port:host:hostport] [-l login_name] [-m mac_spec] [-o option]\n" |
Damien Miller | b8ea248 | 2004-06-18 22:21:55 +1000 | [diff] [blame] | 160 | " [-p port] [-R port:host:hostport] [-S ctl] [user@]hostname [command]\n" |
Damien Miller | 5095510 | 2004-03-22 09:34:58 +1100 | [diff] [blame] | 161 | ); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 162 | exit(1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 163 | } |
| 164 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 165 | static int ssh_session(void); |
| 166 | static int ssh_session2(void); |
| 167 | static void load_public_identity_files(void); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 168 | static void control_client(const char *path); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 169 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 170 | /* |
| 171 | * Main program for the ssh client. |
| 172 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 173 | int |
| 174 | main(int ac, char **av) |
| 175 | { |
Ben Lindstrom | 2415757 | 2002-06-12 16:09:39 +0000 | [diff] [blame] | 176 | int i, opt, exit_status; |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 177 | u_short fwd_port, fwd_host_port; |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 178 | char sfwd_port[6], sfwd_host_port[6]; |
Damien Miller | 9836cf8 | 2003-12-17 16:30:06 +1100 | [diff] [blame] | 179 | char *p, *cp, *line, buf[256]; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 180 | struct stat st; |
Ben Lindstrom | 086cf21 | 2001-03-05 05:56:40 +0000 | [diff] [blame] | 181 | struct passwd *pw; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 182 | int dummy; |
Ben Lindstrom | 5ccf63a | 2001-09-24 20:00:10 +0000 | [diff] [blame] | 183 | extern int optind, optreset; |
Damien Miller | 4f8e669 | 2001-07-14 13:22:53 +1000 | [diff] [blame] | 184 | extern char *optarg; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 185 | |
Damien Miller | 59d3d5b | 2003-08-22 09:34:41 +1000 | [diff] [blame] | 186 | __progname = ssh_get_progname(av[0]); |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 187 | init_rng(); |
| 188 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 189 | /* |
| 190 | * Save the original real uid. It will be needed later (uid-swapping |
| 191 | * may clobber the real uid). |
| 192 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 193 | original_real_uid = getuid(); |
| 194 | original_effective_uid = geteuid(); |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 195 | |
Damien Miller | 50b9a60 | 2002-09-04 16:50:06 +1000 | [diff] [blame] | 196 | /* |
| 197 | * Use uid-swapping to give up root privileges for the duration of |
| 198 | * option processing. We will re-instantiate the rights when we are |
| 199 | * ready to create the privileged port, and will permanently drop |
| 200 | * them when the port has been created (actually, when the connection |
| 201 | * has been made, as we may need to create the port several times). |
| 202 | */ |
| 203 | PRIV_END; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 204 | |
Damien Miller | 05dd795 | 2000-10-01 00:42:48 +1100 | [diff] [blame] | 205 | #ifdef HAVE_SETRLIMIT |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 206 | /* If we are installed setuid root be careful to not drop core. */ |
| 207 | if (original_real_uid != original_effective_uid) { |
| 208 | struct rlimit rlim; |
| 209 | rlim.rlim_cur = rlim.rlim_max = 0; |
| 210 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) |
| 211 | fatal("setrlimit failed: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 212 | } |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 213 | #endif |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 214 | /* Get user data. */ |
| 215 | pw = getpwuid(original_real_uid); |
| 216 | if (!pw) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 217 | logit("You don't exist, go away!"); |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 218 | exit(1); |
| 219 | } |
| 220 | /* Take a copy of the returned structure. */ |
| 221 | pw = pwcopy(pw); |
| 222 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 223 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 224 | * Set our umask to something reasonable, as some files are created |
| 225 | * with the default umask. This will make them world-readable but |
| 226 | * writable only by the owner, which is ok for all files for which we |
| 227 | * don't set the modes explicitly. |
| 228 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 229 | umask(022); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 230 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 231 | /* Initialize option structure to indicate that no values have been set. */ |
| 232 | initialize_options(&options); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 233 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 234 | /* Parse command-line arguments. */ |
| 235 | host = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 236 | |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 237 | again: |
| 238 | while ((opt = getopt(ac, av, |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 239 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNPR:S:TVXY")) != -1) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 240 | switch (opt) { |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 241 | case '1': |
| 242 | options.protocol = SSH_PROTO_1; |
| 243 | break; |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 244 | case '2': |
| 245 | options.protocol = SSH_PROTO_2; |
| 246 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 247 | case '4': |
Darren Tucker | 0a4f04b | 2003-07-03 20:37:47 +1000 | [diff] [blame] | 248 | options.address_family = AF_INET; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 249 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 250 | case '6': |
Darren Tucker | 0a4f04b | 2003-07-03 20:37:47 +1000 | [diff] [blame] | 251 | options.address_family = AF_INET6; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 252 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 253 | case 'n': |
| 254 | stdin_null_flag = 1; |
| 255 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 256 | case 'f': |
| 257 | fork_after_authentication_flag = 1; |
| 258 | stdin_null_flag = 1; |
| 259 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 260 | case 'x': |
| 261 | options.forward_x11 = 0; |
| 262 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 263 | case 'X': |
| 264 | options.forward_x11 = 1; |
| 265 | break; |
Darren Tucker | 0a118da | 2003-10-15 15:54:32 +1000 | [diff] [blame] | 266 | case 'Y': |
| 267 | options.forward_x11 = 1; |
| 268 | options.forward_x11_trusted = 1; |
| 269 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 270 | case 'g': |
| 271 | options.gateway_ports = 1; |
| 272 | break; |
Damien Miller | 147bba3 | 2002-09-04 16:46:06 +1000 | [diff] [blame] | 273 | case 'P': /* deprecated */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 274 | options.use_privileged_port = 0; |
| 275 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 276 | case 'a': |
| 277 | options.forward_agent = 0; |
| 278 | break; |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 279 | case 'A': |
| 280 | options.forward_agent = 1; |
| 281 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 282 | case 'k': |
Damien Miller | e0113cc | 2003-11-24 13:10:09 +1100 | [diff] [blame] | 283 | options.gss_deleg_creds = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 284 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 285 | case 'i': |
| 286 | if (stat(optarg, &st) < 0) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 287 | fprintf(stderr, "Warning: Identity file %s " |
| 288 | "does not exist.\n", optarg); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 289 | break; |
| 290 | } |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 291 | if (options.num_identity_files >= |
| 292 | SSH_MAX_IDENTITY_FILES) |
| 293 | fatal("Too many identity files specified " |
| 294 | "(max %d)", SSH_MAX_IDENTITY_FILES); |
| 295 | options.identity_files[options.num_identity_files++] = |
| 296 | xstrdup(optarg); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 297 | break; |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 298 | case 'I': |
| 299 | #ifdef SMARTCARD |
Ben Lindstrom | f7db3bb | 2001-08-06 21:35:51 +0000 | [diff] [blame] | 300 | options.smartcard_device = xstrdup(optarg); |
Ben Lindstrom | bcc1808 | 2001-08-06 21:59:25 +0000 | [diff] [blame] | 301 | #else |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 302 | fprintf(stderr, "no support for smartcards.\n"); |
Ben Lindstrom | bcc1808 | 2001-08-06 21:59:25 +0000 | [diff] [blame] | 303 | #endif |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 304 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 305 | case 't': |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 306 | if (tty_flag) |
| 307 | force_tty_flag = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 308 | tty_flag = 1; |
| 309 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 310 | case 'v': |
Darren Tucker | e98dfa3 | 2003-07-19 19:54:31 +1000 | [diff] [blame] | 311 | if (debug_flag == 0) { |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 312 | debug_flag = 1; |
| 313 | options.log_level = SYSLOG_LEVEL_DEBUG1; |
Darren Tucker | e98dfa3 | 2003-07-19 19:54:31 +1000 | [diff] [blame] | 314 | } else { |
| 315 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) |
| 316 | options.log_level++; |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 317 | break; |
Darren Tucker | e98dfa3 | 2003-07-19 19:54:31 +1000 | [diff] [blame] | 318 | } |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 319 | /* fallthrough */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 320 | case 'V': |
Damien Miller | 0c889cd | 2004-03-22 09:36:00 +1100 | [diff] [blame] | 321 | fprintf(stderr, "%s, %s\n", |
| 322 | SSH_VERSION, SSLeay_version(SSLEAY_VERSION)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 323 | if (opt == 'V') |
| 324 | exit(0); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 325 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 326 | case 'q': |
| 327 | options.log_level = SYSLOG_LEVEL_QUIET; |
| 328 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 329 | case 'e': |
| 330 | if (optarg[0] == '^' && optarg[2] == 0 && |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 331 | (u_char) optarg[1] >= 64 && |
| 332 | (u_char) optarg[1] < 128) |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 333 | options.escape_char = (u_char) optarg[1] & 31; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 334 | else if (strlen(optarg) == 1) |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 335 | options.escape_char = (u_char) optarg[0]; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 336 | else if (strcmp(optarg, "none") == 0) |
Ben Lindstrom | 2b1f71b | 2001-06-05 20:32:21 +0000 | [diff] [blame] | 337 | options.escape_char = SSH_ESCAPECHAR_NONE; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 338 | else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 339 | fprintf(stderr, "Bad escape character '%s'.\n", |
| 340 | optarg); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 341 | exit(1); |
| 342 | } |
| 343 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 344 | case 'c': |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 345 | if (ciphers_valid(optarg)) { |
| 346 | /* SSH2 only */ |
| 347 | options.ciphers = xstrdup(optarg); |
Darren Tucker | 5cb30ad | 2004-08-12 22:40:24 +1000 | [diff] [blame] | 348 | options.cipher = SSH_CIPHER_INVALID; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 349 | } else { |
| 350 | /* SSH1 only */ |
Damien Miller | e39cacc | 2000-11-29 12:18:44 +1100 | [diff] [blame] | 351 | options.cipher = cipher_number(optarg); |
| 352 | if (options.cipher == -1) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 353 | fprintf(stderr, |
| 354 | "Unknown cipher type '%s'\n", |
| 355 | optarg); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 356 | exit(1); |
| 357 | } |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 358 | if (options.cipher == SSH_CIPHER_3DES) |
Damien Miller | e39cacc | 2000-11-29 12:18:44 +1100 | [diff] [blame] | 359 | options.ciphers = "3des-cbc"; |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 360 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
Damien Miller | e39cacc | 2000-11-29 12:18:44 +1100 | [diff] [blame] | 361 | options.ciphers = "blowfish-cbc"; |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 362 | else |
Damien Miller | e39cacc | 2000-11-29 12:18:44 +1100 | [diff] [blame] | 363 | options.ciphers = (char *)-1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 364 | } |
| 365 | break; |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 366 | case 'm': |
| 367 | if (mac_valid(optarg)) |
| 368 | options.macs = xstrdup(optarg); |
| 369 | else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 370 | fprintf(stderr, "Unknown mac type '%s'\n", |
| 371 | optarg); |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 372 | exit(1); |
| 373 | } |
| 374 | break; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 375 | case 'M': |
Damien Miller | b8ea248 | 2004-06-18 22:21:55 +1000 | [diff] [blame] | 376 | options.control_master = |
| 377 | (options.control_master >= 1) ? 2 : 1; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 378 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 379 | case 'p': |
Ben Lindstrom | 19066a1 | 2001-04-12 23:39:26 +0000 | [diff] [blame] | 380 | options.port = a2port(optarg); |
| 381 | if (options.port == 0) { |
Ben Lindstrom | 146edb9 | 2001-04-11 23:06:28 +0000 | [diff] [blame] | 382 | fprintf(stderr, "Bad port '%s'\n", optarg); |
| 383 | exit(1); |
| 384 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 385 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 386 | case 'l': |
| 387 | options.user = optarg; |
| 388 | break; |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 389 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 390 | case 'L': |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 391 | case 'R': |
Damien Miller | 1ea7166 | 2003-05-14 22:33:58 +1000 | [diff] [blame] | 392 | if (sscanf(optarg, "%5[0123456789]:%255[^:]:%5[0123456789]", |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 393 | sfwd_port, buf, sfwd_host_port) != 3 && |
Damien Miller | 1ea7166 | 2003-05-14 22:33:58 +1000 | [diff] [blame] | 394 | sscanf(optarg, "%5[0123456789]/%255[^/]/%5[0123456789]", |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 395 | sfwd_port, buf, sfwd_host_port) != 3) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 396 | fprintf(stderr, |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 397 | "Bad forwarding specification '%s'\n", |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 398 | optarg); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 399 | usage(); |
| 400 | /* NOTREACHED */ |
| 401 | } |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 402 | if ((fwd_port = a2port(sfwd_port)) == 0 || |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 403 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 404 | fprintf(stderr, |
| 405 | "Bad forwarding port(s) '%s'\n", optarg); |
| 406 | exit(1); |
| 407 | } |
| 408 | if (opt == 'L') |
| 409 | add_local_forward(&options, fwd_port, buf, |
| 410 | fwd_host_port); |
| 411 | else if (opt == 'R') |
| 412 | add_remote_forward(&options, fwd_port, buf, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 413 | fwd_host_port); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 414 | break; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 415 | |
| 416 | case 'D': |
Ben Lindstrom | 19066a1 | 2001-04-12 23:39:26 +0000 | [diff] [blame] | 417 | fwd_port = a2port(optarg); |
| 418 | if (fwd_port == 0) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 419 | fprintf(stderr, "Bad dynamic port '%s'\n", |
| 420 | optarg); |
Ben Lindstrom | 146edb9 | 2001-04-11 23:06:28 +0000 | [diff] [blame] | 421 | exit(1); |
| 422 | } |
Darren Tucker | 1c52ee3 | 2003-08-13 20:38:36 +1000 | [diff] [blame] | 423 | add_local_forward(&options, fwd_port, "socks", 0); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 424 | break; |
| 425 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 426 | case 'C': |
| 427 | options.compression = 1; |
| 428 | break; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 429 | case 'N': |
| 430 | no_shell_flag = 1; |
| 431 | no_tty_flag = 1; |
| 432 | break; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 433 | case 'T': |
| 434 | no_tty_flag = 1; |
| 435 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 436 | case 'o': |
| 437 | dummy = 1; |
Damien Miller | 9836cf8 | 2003-12-17 16:30:06 +1100 | [diff] [blame] | 438 | line = xstrdup(optarg); |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 439 | if (process_config_line(&options, host ? host : "", |
Damien Miller | 9836cf8 | 2003-12-17 16:30:06 +1100 | [diff] [blame] | 440 | line, "command-line", 0, &dummy) != 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 441 | exit(1); |
Damien Miller | 9836cf8 | 2003-12-17 16:30:06 +1100 | [diff] [blame] | 442 | xfree(line); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 443 | break; |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 444 | case 's': |
| 445 | subsystem_flag = 1; |
| 446 | break; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 447 | case 'S': |
| 448 | if (options.control_path != NULL) |
| 449 | free(options.control_path); |
| 450 | options.control_path = xstrdup(optarg); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 451 | break; |
Ben Lindstrom | e0f8804 | 2001-04-30 13:06:24 +0000 | [diff] [blame] | 452 | case 'b': |
| 453 | options.bind_address = optarg; |
| 454 | break; |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 455 | case 'F': |
| 456 | config = optarg; |
| 457 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 458 | default: |
| 459 | usage(); |
| 460 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 461 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 462 | |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 463 | ac -= optind; |
| 464 | av += optind; |
| 465 | |
| 466 | if (ac > 0 && !host && **av != '-') { |
Ben Lindstrom | c276c12 | 2002-12-23 02:14:51 +0000 | [diff] [blame] | 467 | if (strrchr(*av, '@')) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 468 | p = xstrdup(*av); |
Ben Lindstrom | c276c12 | 2002-12-23 02:14:51 +0000 | [diff] [blame] | 469 | cp = strrchr(p, '@'); |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 470 | if (cp == NULL || cp == p) |
| 471 | usage(); |
| 472 | options.user = p; |
| 473 | *cp = '\0'; |
| 474 | host = ++cp; |
| 475 | } else |
| 476 | host = *av; |
Ben Lindstrom | b9fa691 | 2002-12-23 02:24:54 +0000 | [diff] [blame] | 477 | if (ac > 1) { |
| 478 | optind = optreset = 1; |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 479 | goto again; |
| 480 | } |
Ben Lindstrom | b9fa691 | 2002-12-23 02:24:54 +0000 | [diff] [blame] | 481 | ac--, av++; |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 482 | } |
| 483 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 484 | /* Check that we got a host name. */ |
| 485 | if (!host) |
| 486 | usage(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 487 | |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 488 | SSLeay_add_all_algorithms(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 489 | ERR_load_crypto_strings(); |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 490 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 491 | /* Initialize the command to execute on remote host. */ |
| 492 | buffer_init(&command); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 493 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 494 | /* |
| 495 | * Save the command to execute on the remote host in a buffer. There |
| 496 | * is no limit on the length of the command, except by the maximum |
| 497 | * packet size. Also sets the tty flag if there is no command. |
| 498 | */ |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 499 | if (!ac) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 500 | /* No command specified - execute shell on a tty. */ |
| 501 | tty_flag = 1; |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 502 | if (subsystem_flag) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 503 | fprintf(stderr, |
| 504 | "You must specify a subsystem to invoke.\n"); |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 505 | usage(); |
| 506 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 507 | } else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 508 | /* A command has been specified. Store it into the buffer. */ |
| 509 | for (i = 0; i < ac; i++) { |
| 510 | if (i) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 511 | buffer_append(&command, " ", 1); |
| 512 | buffer_append(&command, av[i], strlen(av[i])); |
| 513 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 514 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 515 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 516 | /* Cannot fork to background if no command. */ |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 517 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 518 | fatal("Cannot fork into background without a command to execute."); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 519 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 520 | /* Allocate a tty by default if no command specified. */ |
| 521 | if (buffer_len(&command) == 0) |
| 522 | tty_flag = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 523 | |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 524 | /* Force no tty */ |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 525 | if (no_tty_flag) |
| 526 | tty_flag = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 527 | /* Do not allocate a tty if stdin is not a tty. */ |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 528 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 529 | if (tty_flag) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 530 | logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 531 | tty_flag = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 532 | } |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 533 | |
Ben Lindstrom | 8a432f5 | 2001-03-05 07:24:46 +0000 | [diff] [blame] | 534 | /* |
| 535 | * Initialize "log" output. Since we are the client all output |
| 536 | * actually goes to stderr. |
| 537 | */ |
Ben Lindstrom | 2b64652 | 2001-04-12 16:16:57 +0000 | [diff] [blame] | 538 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
| 539 | SYSLOG_FACILITY_USER, 1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 540 | |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 541 | /* |
| 542 | * Read per-user configuration file. Ignore the system wide config |
| 543 | * file if the user specifies a config file on the command line. |
| 544 | */ |
| 545 | if (config != NULL) { |
Damien Miller | 914420f | 2004-04-20 20:14:07 +1000 | [diff] [blame] | 546 | if (!read_config_file(config, host, &options, 0)) |
Ben Lindstrom | edc0cf2 | 2001-09-12 18:32:20 +0000 | [diff] [blame] | 547 | fatal("Can't open user config file %.100s: " |
| 548 | "%.100s", config, strerror(errno)); |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 549 | } else { |
| 550 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, |
| 551 | _PATH_SSH_USER_CONFFILE); |
Damien Miller | 57a4476 | 2004-04-20 20:11:57 +1000 | [diff] [blame] | 552 | (void)read_config_file(buf, host, &options, 1); |
Ben Lindstrom | 83f07d1 | 2001-10-03 17:22:29 +0000 | [diff] [blame] | 553 | |
| 554 | /* Read systemwide configuration file after use config. */ |
Darren Tucker | fc95970 | 2004-07-17 16:12:08 +1000 | [diff] [blame] | 555 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, |
Damien Miller | 57a4476 | 2004-04-20 20:11:57 +1000 | [diff] [blame] | 556 | &options, 0); |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 557 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 558 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 559 | /* Fill configuration defaults. */ |
| 560 | fill_default_options(&options); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 561 | |
Darren Tucker | 0a4f04b | 2003-07-03 20:37:47 +1000 | [diff] [blame] | 562 | channel_set_af(options.address_family); |
| 563 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 564 | /* reinit */ |
Ben Lindstrom | 8a432f5 | 2001-03-05 07:24:46 +0000 | [diff] [blame] | 565 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 566 | |
Damien Miller | 60bc517 | 2001-03-19 09:38:15 +1100 | [diff] [blame] | 567 | seed_rng(); |
| 568 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 569 | if (options.user == NULL) |
| 570 | options.user = xstrdup(pw->pw_name); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 571 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 572 | if (options.hostname != NULL) |
| 573 | host = options.hostname; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 574 | |
Darren Tucker | 3f521e2 | 2003-07-03 16:20:42 +1000 | [diff] [blame] | 575 | /* force lowercase for hostkey matching */ |
| 576 | if (options.host_key_alias != NULL) { |
| 577 | for (p = options.host_key_alias; *p; p++) |
| 578 | if (isupper(*p)) |
| 579 | *p = tolower(*p); |
| 580 | } |
| 581 | |
Damien Miller | 9f1e33a | 2003-02-24 11:57:32 +1100 | [diff] [blame] | 582 | if (options.proxy_command != NULL && |
| 583 | strcmp(options.proxy_command, "none") == 0) |
| 584 | options.proxy_command = NULL; |
| 585 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 586 | if (options.control_path != NULL) { |
| 587 | options.control_path = tilde_expand_filename( |
| 588 | options.control_path, original_real_uid); |
| 589 | } |
| 590 | if (options.control_path != NULL && options.control_master == 0) |
| 591 | control_client(options.control_path); /* This doesn't return */ |
| 592 | |
Kevin Steves | fcec7f8 | 2000-12-15 19:55:48 +0000 | [diff] [blame] | 593 | /* Open a connection to the remote host. */ |
Darren Tucker | 0a4f04b | 2003-07-03 20:37:47 +1000 | [diff] [blame] | 594 | if (ssh_connect(host, &hostaddr, options.port, |
| 595 | options.address_family, options.connection_attempts, |
Ben Lindstrom | 1aa6427 | 2002-06-11 20:28:05 +0000 | [diff] [blame] | 596 | #ifdef HAVE_CYGWIN |
| 597 | options.use_privileged_port, |
| 598 | #else |
Ben Lindstrom | f9c4884 | 2002-06-11 16:37:51 +0000 | [diff] [blame] | 599 | original_effective_uid == 0 && options.use_privileged_port, |
Ben Lindstrom | 1aa6427 | 2002-06-11 20:28:05 +0000 | [diff] [blame] | 600 | #endif |
Ben Lindstrom | da394ca | 2002-06-12 16:11:12 +0000 | [diff] [blame] | 601 | options.proxy_command) != 0) |
Ben Lindstrom | 2415757 | 2002-06-12 16:09:39 +0000 | [diff] [blame] | 602 | exit(1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 603 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 604 | /* |
| 605 | * If we successfully made the connection, load the host private key |
| 606 | * in case we will need it later for combined rsa-rhosts |
| 607 | * authentication. This must be done before releasing extra |
| 608 | * privileges, because the file is only readable by root. |
Ben Lindstrom | 9e5bb57 | 2002-06-06 19:58:27 +0000 | [diff] [blame] | 609 | * If we cannot access the private keys, load the public keys |
| 610 | * instead and try to execute the ssh-keysign helper instead. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 611 | */ |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 612 | sensitive_data.nkeys = 0; |
| 613 | sensitive_data.keys = NULL; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 614 | sensitive_data.external_keysign = 0; |
Ben Lindstrom | 2415757 | 2002-06-12 16:09:39 +0000 | [diff] [blame] | 615 | if (options.rhosts_rsa_authentication || |
| 616 | options.hostbased_authentication) { |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 617 | sensitive_data.nkeys = 3; |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 618 | sensitive_data.keys = xmalloc(sensitive_data.nkeys * |
| 619 | sizeof(Key)); |
Ben Lindstrom | f9c4884 | 2002-06-11 16:37:51 +0000 | [diff] [blame] | 620 | |
| 621 | PRIV_START; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 622 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 623 | _PATH_HOST_KEY_FILE, "", NULL); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 624 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
| 625 | _PATH_HOST_DSA_KEY_FILE, "", NULL); |
| 626 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, |
| 627 | _PATH_HOST_RSA_KEY_FILE, "", NULL); |
Ben Lindstrom | f9c4884 | 2002-06-11 16:37:51 +0000 | [diff] [blame] | 628 | PRIV_END; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 629 | |
Ben Lindstrom | 5d35a2f | 2002-07-04 00:19:40 +0000 | [diff] [blame] | 630 | if (options.hostbased_authentication == 1 && |
| 631 | sensitive_data.keys[0] == NULL && |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 632 | sensitive_data.keys[1] == NULL && |
| 633 | sensitive_data.keys[2] == NULL) { |
| 634 | sensitive_data.keys[1] = key_load_public( |
| 635 | _PATH_HOST_DSA_KEY_FILE, NULL); |
| 636 | sensitive_data.keys[2] = key_load_public( |
| 637 | _PATH_HOST_RSA_KEY_FILE, NULL); |
| 638 | sensitive_data.external_keysign = 1; |
| 639 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 640 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 641 | /* |
| 642 | * Get rid of any extra privileges that we may have. We will no |
| 643 | * longer need them. Also, extra privileges could make it very hard |
| 644 | * to read identity files and other non-world-readable files from the |
| 645 | * user's home directory if it happens to be on a NFS volume where |
| 646 | * root is mapped to nobody. |
| 647 | */ |
Darren Tucker | 25f60a7 | 2004-08-15 17:23:34 +1000 | [diff] [blame] | 648 | if (original_effective_uid == 0) { |
| 649 | PRIV_START; |
| 650 | permanently_set_uid(pw); |
| 651 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 652 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 653 | /* |
| 654 | * Now that we are back to our own permissions, create ~/.ssh |
| 655 | * directory if it doesn\'t already exist. |
| 656 | */ |
Ben Lindstrom | 930b14a | 2001-08-15 23:19:21 +0000 | [diff] [blame] | 657 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 658 | if (stat(buf, &st) < 0) |
Damien Miller | be484b5 | 2000-07-15 14:14:16 +1000 | [diff] [blame] | 659 | if (mkdir(buf, 0700) < 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 660 | error("Could not create directory '%.200s'.", buf); |
| 661 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 662 | /* load options.identity_files */ |
| 663 | load_public_identity_files(); |
| 664 | |
| 665 | /* Expand ~ in known host file names. */ |
| 666 | /* XXX mem-leaks: */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 667 | options.system_hostfile = |
| 668 | tilde_expand_filename(options.system_hostfile, original_real_uid); |
| 669 | options.user_hostfile = |
| 670 | tilde_expand_filename(options.user_hostfile, original_real_uid); |
| 671 | options.system_hostfile2 = |
| 672 | tilde_expand_filename(options.system_hostfile2, original_real_uid); |
| 673 | options.user_hostfile2 = |
| 674 | tilde_expand_filename(options.user_hostfile2, original_real_uid); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 675 | |
Damien Miller | 07cd589 | 2001-11-12 10:52:03 +1100 | [diff] [blame] | 676 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
| 677 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 678 | /* Log into the remote system. This never returns if the login fails. */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 679 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 680 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 681 | /* We no longer need the private host keys. Clear them now. */ |
| 682 | if (sensitive_data.nkeys != 0) { |
| 683 | for (i = 0; i < sensitive_data.nkeys; i++) { |
| 684 | if (sensitive_data.keys[i] != NULL) { |
| 685 | /* Destroys contents safely */ |
| 686 | debug3("clear hostkey %d", i); |
| 687 | key_free(sensitive_data.keys[i]); |
| 688 | sensitive_data.keys[i] = NULL; |
| 689 | } |
| 690 | } |
| 691 | xfree(sensitive_data.keys); |
| 692 | } |
Ben Lindstrom | a6c8a8d | 2001-08-06 21:42:00 +0000 | [diff] [blame] | 693 | for (i = 0; i < options.num_identity_files; i++) { |
| 694 | if (options.identity_files[i]) { |
| 695 | xfree(options.identity_files[i]); |
| 696 | options.identity_files[i] = NULL; |
| 697 | } |
| 698 | if (options.identity_keys[i]) { |
| 699 | key_free(options.identity_keys[i]); |
| 700 | options.identity_keys[i] = NULL; |
| 701 | } |
| 702 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 703 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 704 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
| 705 | packet_close(); |
Damien Miller | 8c4e18a | 2002-09-19 12:05:02 +1000 | [diff] [blame] | 706 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 707 | if (options.control_path != NULL && control_fd != -1) |
| 708 | unlink(options.control_path); |
| 709 | |
Damien Miller | 8c4e18a | 2002-09-19 12:05:02 +1000 | [diff] [blame] | 710 | /* |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 711 | * Send SIGHUP to proxy command if used. We don't wait() in |
Damien Miller | 8c4e18a | 2002-09-19 12:05:02 +1000 | [diff] [blame] | 712 | * case it hangs and instead rely on init to reap the child |
| 713 | */ |
| 714 | if (proxy_command_pid > 1) |
| 715 | kill(proxy_command_pid, SIGHUP); |
| 716 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 717 | return exit_status; |
| 718 | } |
| 719 | |
Darren Tucker | 0a118da | 2003-10-15 15:54:32 +1000 | [diff] [blame] | 720 | #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
| 721 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 722 | static void |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 723 | x11_get_proto(char **_proto, char **_data) |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 724 | { |
Darren Tucker | 0a118da | 2003-10-15 15:54:32 +1000 | [diff] [blame] | 725 | char cmd[1024]; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 726 | char line[512]; |
Darren Tucker | 0a118da | 2003-10-15 15:54:32 +1000 | [diff] [blame] | 727 | char xdisplay[512]; |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 728 | static char proto[512], data[512]; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 729 | FILE *f; |
Darren Tucker | 0a118da | 2003-10-15 15:54:32 +1000 | [diff] [blame] | 730 | int got_data = 0, generated = 0, do_unlink = 0, i; |
| 731 | char *display, *xauthdir, *xauthfile; |
Ben Lindstrom | ee8d52d | 2002-07-23 21:03:02 +0000 | [diff] [blame] | 732 | struct stat st; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 733 | |
Darren Tucker | 0a118da | 2003-10-15 15:54:32 +1000 | [diff] [blame] | 734 | xauthdir = xauthfile = NULL; |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 735 | *_proto = proto; |
| 736 | *_data = data; |
| 737 | proto[0] = data[0] = '\0'; |
Darren Tucker | 0a118da | 2003-10-15 15:54:32 +1000 | [diff] [blame] | 738 | |
Ben Lindstrom | ee8d52d | 2002-07-23 21:03:02 +0000 | [diff] [blame] | 739 | if (!options.xauth_location || |
| 740 | (stat(options.xauth_location, &st) == -1)) { |
| 741 | debug("No xauth program."); |
| 742 | } else { |
| 743 | if ((display = getenv("DISPLAY")) == NULL) { |
| 744 | debug("x11_get_proto: DISPLAY not set"); |
| 745 | return; |
| 746 | } |
Darren Tucker | 0a118da | 2003-10-15 15:54:32 +1000 | [diff] [blame] | 747 | /* |
| 748 | * Handle FamilyLocal case where $DISPLAY does |
| 749 | * not match an authorization entry. For this we |
| 750 | * just try "xauth list unix:displaynum.screennum". |
| 751 | * XXX: "localhost" match to determine FamilyLocal |
| 752 | * is not perfect. |
| 753 | */ |
| 754 | if (strncmp(display, "localhost:", 10) == 0) { |
| 755 | snprintf(xdisplay, sizeof(xdisplay), "unix:%s", |
| 756 | display + 10); |
| 757 | display = xdisplay; |
| 758 | } |
| 759 | if (options.forward_x11_trusted == 0) { |
| 760 | xauthdir = xmalloc(MAXPATHLEN); |
| 761 | xauthfile = xmalloc(MAXPATHLEN); |
| 762 | strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
| 763 | if (mkdtemp(xauthdir) != NULL) { |
| 764 | do_unlink = 1; |
| 765 | snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", |
| 766 | xauthdir); |
| 767 | snprintf(cmd, sizeof(cmd), |
| 768 | "%s -f %s generate %s " SSH_X11_PROTO |
Damien Miller | 3df755e | 2004-03-22 09:34:26 +1100 | [diff] [blame] | 769 | " untrusted timeout 1200 2>" _PATH_DEVNULL, |
Darren Tucker | 0a118da | 2003-10-15 15:54:32 +1000 | [diff] [blame] | 770 | options.xauth_location, xauthfile, display); |
| 771 | debug2("x11_get_proto: %s", cmd); |
| 772 | if (system(cmd) == 0) |
| 773 | generated = 1; |
| 774 | } |
| 775 | } |
| 776 | snprintf(cmd, sizeof(cmd), |
| 777 | "%s %s%s list %s . 2>" _PATH_DEVNULL, |
| 778 | options.xauth_location, |
| 779 | generated ? "-f " : "" , |
| 780 | generated ? xauthfile : "", |
| 781 | display); |
| 782 | debug2("x11_get_proto: %s", cmd); |
| 783 | f = popen(cmd, "r"); |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 784 | if (f && fgets(line, sizeof(line), f) && |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 785 | sscanf(line, "%*s %511s %511s", proto, data) == 2) |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 786 | got_data = 1; |
| 787 | if (f) |
| 788 | pclose(f); |
| 789 | } |
Darren Tucker | 0a118da | 2003-10-15 15:54:32 +1000 | [diff] [blame] | 790 | |
| 791 | if (do_unlink) { |
| 792 | unlink(xauthfile); |
| 793 | rmdir(xauthdir); |
| 794 | } |
| 795 | if (xauthdir) |
| 796 | xfree(xauthdir); |
| 797 | if (xauthfile) |
| 798 | xfree(xauthfile); |
| 799 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 800 | /* |
| 801 | * If we didn't get authentication data, just make up some |
| 802 | * data. The forwarding code will check the validity of the |
| 803 | * response anyway, and substitute this data. The X11 |
| 804 | * server, however, will ignore this fake data and use |
| 805 | * whatever authentication mechanisms it was using otherwise |
| 806 | * for the local connection. |
| 807 | */ |
| 808 | if (!got_data) { |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 809 | u_int32_t rnd = 0; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 810 | |
Darren Tucker | 0a118da | 2003-10-15 15:54:32 +1000 | [diff] [blame] | 811 | logit("Warning: No xauth data; " |
| 812 | "using fake authentication data for X11 forwarding."); |
| 813 | strlcpy(proto, SSH_X11_PROTO, sizeof proto); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 814 | for (i = 0; i < 16; i++) { |
| 815 | if (i % 4 == 0) |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 816 | rnd = arc4random(); |
Darren Tucker | 0a118da | 2003-10-15 15:54:32 +1000 | [diff] [blame] | 817 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 818 | rnd & 0xff); |
| 819 | rnd >>= 8; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 820 | } |
| 821 | } |
| 822 | } |
| 823 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 824 | static void |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 825 | ssh_init_forwarding(void) |
| 826 | { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 827 | int success = 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 828 | int i; |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 829 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 830 | /* Initiate local TCP/IP port forwardings. */ |
| 831 | for (i = 0; i < options.num_local_forwards; i++) { |
| 832 | debug("Connections to local port %d forwarded to remote address %.200s:%d", |
| 833 | options.local_forwards[i].port, |
| 834 | options.local_forwards[i].host, |
| 835 | options.local_forwards[i].host_port); |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 836 | success += channel_setup_local_fwd_listener( |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 837 | options.local_forwards[i].port, |
| 838 | options.local_forwards[i].host, |
| 839 | options.local_forwards[i].host_port, |
| 840 | options.gateway_ports); |
| 841 | } |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 842 | if (i > 0 && success == 0) |
| 843 | error("Could not request local forwarding."); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 844 | |
| 845 | /* Initiate remote TCP/IP port forwardings. */ |
| 846 | for (i = 0; i < options.num_remote_forwards; i++) { |
| 847 | debug("Connections to remote port %d forwarded to local address %.200s:%d", |
| 848 | options.remote_forwards[i].port, |
| 849 | options.remote_forwards[i].host, |
| 850 | options.remote_forwards[i].host_port); |
| 851 | channel_request_remote_forwarding( |
| 852 | options.remote_forwards[i].port, |
| 853 | options.remote_forwards[i].host, |
| 854 | options.remote_forwards[i].host_port); |
| 855 | } |
| 856 | } |
| 857 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 858 | static void |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 859 | check_agent_present(void) |
| 860 | { |
| 861 | if (options.forward_agent) { |
| 862 | /* Clear agent forwarding if we don\'t have an agent. */ |
Damien Miller | 789e95d | 2002-09-12 09:52:46 +1000 | [diff] [blame] | 863 | if (!ssh_agent_present()) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 864 | options.forward_agent = 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 865 | } |
| 866 | } |
| 867 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 868 | static int |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 869 | ssh_session(void) |
| 870 | { |
| 871 | int type; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 872 | int interactive = 0; |
| 873 | int have_tty = 0; |
| 874 | struct winsize ws; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 875 | char *cp; |
| 876 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 877 | /* Enable compression if requested. */ |
| 878 | if (options.compression) { |
| 879 | debug("Requesting compression at level %d.", options.compression_level); |
| 880 | |
| 881 | if (options.compression_level < 1 || options.compression_level > 9) |
| 882 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); |
| 883 | |
| 884 | /* Send the request. */ |
| 885 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); |
| 886 | packet_put_int(options.compression_level); |
| 887 | packet_send(); |
| 888 | packet_write_wait(); |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 889 | type = packet_read(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 890 | if (type == SSH_SMSG_SUCCESS) |
| 891 | packet_start_compression(options.compression_level); |
| 892 | else if (type == SSH_SMSG_FAILURE) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 893 | logit("Warning: Remote host refused compression."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 894 | else |
| 895 | packet_disconnect("Protocol error waiting for compression response."); |
| 896 | } |
| 897 | /* Allocate a pseudo tty if appropriate. */ |
| 898 | if (tty_flag) { |
| 899 | debug("Requesting pty."); |
| 900 | |
| 901 | /* Start the packet. */ |
| 902 | packet_start(SSH_CMSG_REQUEST_PTY); |
| 903 | |
| 904 | /* Store TERM in the packet. There is no limit on the |
| 905 | length of the string. */ |
| 906 | cp = getenv("TERM"); |
| 907 | if (!cp) |
| 908 | cp = ""; |
Ben Lindstrom | 664408d | 2001-06-09 01:42:01 +0000 | [diff] [blame] | 909 | packet_put_cstring(cp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 910 | |
| 911 | /* Store window size in the packet. */ |
| 912 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
| 913 | memset(&ws, 0, sizeof(ws)); |
| 914 | packet_put_int(ws.ws_row); |
| 915 | packet_put_int(ws.ws_col); |
| 916 | packet_put_int(ws.ws_xpixel); |
| 917 | packet_put_int(ws.ws_ypixel); |
| 918 | |
| 919 | /* Store tty modes in the packet. */ |
Ben Lindstrom | ae8e2d3 | 2001-04-14 23:13:02 +0000 | [diff] [blame] | 920 | tty_make_modes(fileno(stdin), NULL); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 921 | |
| 922 | /* Send the packet, and wait for it to leave. */ |
| 923 | packet_send(); |
| 924 | packet_write_wait(); |
| 925 | |
| 926 | /* Read response from the server. */ |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 927 | type = packet_read(); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 928 | if (type == SSH_SMSG_SUCCESS) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 929 | interactive = 1; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 930 | have_tty = 1; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 931 | } else if (type == SSH_SMSG_FAILURE) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 932 | logit("Warning: Remote host failed or refused to allocate a pseudo tty."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 933 | else |
| 934 | packet_disconnect("Protocol error waiting for pty request response."); |
| 935 | } |
| 936 | /* Request X11 forwarding if enabled and DISPLAY is set. */ |
| 937 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 938 | char *proto, *data; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 939 | /* Get reasonable local authentication information. */ |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 940 | x11_get_proto(&proto, &data); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 941 | /* Request forwarding with authentication spoofing. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 942 | debug("Requesting X11 forwarding with authentication spoofing."); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 943 | x11_request_forwarding_with_spoofing(0, proto, data); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 944 | |
| 945 | /* Read response from the server. */ |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 946 | type = packet_read(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 947 | if (type == SSH_SMSG_SUCCESS) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 948 | interactive = 1; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 949 | } else if (type == SSH_SMSG_FAILURE) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 950 | logit("Warning: Remote host denied X11 forwarding."); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 951 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 952 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 953 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 954 | } |
| 955 | /* Tell the packet module whether this is an interactive session. */ |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 956 | packet_set_interactive(interactive); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 957 | |
| 958 | /* Request authentication agent forwarding if appropriate. */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 959 | check_agent_present(); |
| 960 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 961 | if (options.forward_agent) { |
| 962 | debug("Requesting authentication agent forwarding."); |
| 963 | auth_request_forwarding(); |
| 964 | |
| 965 | /* Read response from the server. */ |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 966 | type = packet_read(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 967 | packet_check_eom(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 968 | if (type != SSH_SMSG_SUCCESS) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 969 | logit("Warning: Remote host denied authentication agent forwarding."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 970 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 971 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 972 | /* Initiate port forwardings. */ |
| 973 | ssh_init_forwarding(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 974 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 975 | /* If requested, let ssh continue in the background. */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 976 | if (fork_after_authentication_flag) |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 977 | if (daemon(1, 1) < 0) |
| 978 | fatal("daemon() failed: %.200s", strerror(errno)); |
| 979 | |
| 980 | /* |
| 981 | * If a command was specified on the command line, execute the |
| 982 | * command now. Otherwise request the server to start a shell. |
| 983 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 984 | if (buffer_len(&command) > 0) { |
| 985 | int len = buffer_len(&command); |
| 986 | if (len > 900) |
| 987 | len = 900; |
Damien Miller | 5a6b4fe | 2001-12-21 14:56:54 +1100 | [diff] [blame] | 988 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 989 | packet_start(SSH_CMSG_EXEC_CMD); |
| 990 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
| 991 | packet_send(); |
| 992 | packet_write_wait(); |
| 993 | } else { |
| 994 | debug("Requesting shell."); |
| 995 | packet_start(SSH_CMSG_EXEC_SHELL); |
| 996 | packet_send(); |
| 997 | packet_write_wait(); |
| 998 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 999 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1000 | /* Enter the interactive session. */ |
Ben Lindstrom | 2b1f71b | 2001-06-05 20:32:21 +0000 | [diff] [blame] | 1001 | return client_loop(have_tty, tty_flag ? |
| 1002 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1003 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1004 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1005 | static void |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1006 | ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 1007 | { |
| 1008 | int id, len; |
| 1009 | |
| 1010 | id = packet_get_int(); |
| 1011 | len = buffer_len(&command); |
Ben Lindstrom | 4040fe1 | 2001-03-05 06:52:57 +0000 | [diff] [blame] | 1012 | if (len > 900) |
| 1013 | len = 900; |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1014 | packet_check_eom(); |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 1015 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
| 1016 | fatal("Request for subsystem '%.*s' failed on channel %d", |
Damien Miller | 5a6b4fe | 2001-12-21 14:56:54 +1100 | [diff] [blame] | 1017 | len, (u_char *)buffer_ptr(&command), id); |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 1018 | } |
| 1019 | |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame] | 1020 | void |
Damien Miller | 509b010 | 2003-12-17 16:33:10 +1100 | [diff] [blame] | 1021 | client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame] | 1022 | { |
| 1023 | int i; |
| 1024 | |
| 1025 | i = client_global_request_id++; |
Damien Miller | 509b010 | 2003-12-17 16:33:10 +1100 | [diff] [blame] | 1026 | if (i >= options.num_remote_forwards) |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame] | 1027 | return; |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame] | 1028 | debug("remote forward %s for: listen %d, connect %s:%d", |
| 1029 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", |
| 1030 | options.remote_forwards[i].port, |
| 1031 | options.remote_forwards[i].host, |
| 1032 | options.remote_forwards[i].host_port); |
| 1033 | if (type == SSH2_MSG_REQUEST_FAILURE) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1034 | logit("Warning: remote port forwarding failed for listen port %d", |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame] | 1035 | options.remote_forwards[i].port); |
| 1036 | } |
| 1037 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1038 | static void |
| 1039 | ssh_control_listener(void) |
| 1040 | { |
| 1041 | struct sockaddr_un addr; |
| 1042 | mode_t old_umask; |
Damien Miller | 07b6ff1 | 2004-06-15 11:14:45 +1000 | [diff] [blame] | 1043 | int addr_len; |
| 1044 | |
Damien Miller | 23f0770 | 2004-06-18 01:19:03 +1000 | [diff] [blame] | 1045 | if (options.control_path == NULL || options.control_master <= 0) |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1046 | return; |
| 1047 | |
| 1048 | memset(&addr, '\0', sizeof(addr)); |
| 1049 | addr.sun_family = AF_UNIX; |
Damien Miller | 07b6ff1 | 2004-06-15 11:14:45 +1000 | [diff] [blame] | 1050 | addr_len = offsetof(struct sockaddr_un, sun_path) + |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1051 | strlen(options.control_path) + 1; |
| 1052 | |
| 1053 | if (strlcpy(addr.sun_path, options.control_path, |
| 1054 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) |
| 1055 | fatal("ControlPath too long"); |
| 1056 | |
| 1057 | if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
| 1058 | fatal("%s socket(): %s\n", __func__, strerror(errno)); |
| 1059 | |
| 1060 | old_umask = umask(0177); |
Damien Miller | 07b6ff1 | 2004-06-15 11:14:45 +1000 | [diff] [blame] | 1061 | if (bind(control_fd, (struct sockaddr*)&addr, addr_len) == -1) { |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1062 | control_fd = -1; |
| 1063 | if (errno == EINVAL) |
| 1064 | fatal("ControlSocket %s already exists", |
| 1065 | options.control_path); |
| 1066 | else |
| 1067 | fatal("%s bind(): %s\n", __func__, strerror(errno)); |
| 1068 | } |
| 1069 | umask(old_umask); |
| 1070 | |
| 1071 | if (listen(control_fd, 64) == -1) |
| 1072 | fatal("%s listen(): %s\n", __func__, strerror(errno)); |
| 1073 | |
| 1074 | set_nonblock(control_fd); |
| 1075 | } |
| 1076 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1077 | /* request pty/x11/agent/tcpfwd/shell for channel */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1078 | static void |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1079 | ssh_session2_setup(int id, void *arg) |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1080 | { |
Damien Miller | 3756dce | 2004-06-18 01:17:29 +1000 | [diff] [blame] | 1081 | extern char **environ; |
| 1082 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1083 | int interactive = tty_flag; |
| 1084 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 1085 | char *proto, *data; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1086 | /* Get reasonable local authentication information. */ |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 1087 | x11_get_proto(&proto, &data); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1088 | /* Request forwarding with authentication spoofing. */ |
| 1089 | debug("Requesting X11 forwarding with authentication spoofing."); |
| 1090 | x11_request_forwarding_with_spoofing(id, proto, data); |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 1091 | interactive = 1; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1092 | /* XXX wait for reply */ |
| 1093 | } |
| 1094 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1095 | check_agent_present(); |
| 1096 | if (options.forward_agent) { |
| 1097 | debug("Requesting authentication agent forwarding."); |
| 1098 | channel_request_start(id, "auth-agent-req@openssh.com", 0); |
| 1099 | packet_send(); |
| 1100 | } |
| 1101 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1102 | client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), |
Damien Miller | 3756dce | 2004-06-18 01:17:29 +1000 | [diff] [blame] | 1103 | NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply); |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 1104 | |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 1105 | packet_set_interactive(interactive); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1106 | } |
| 1107 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1108 | /* open new channel for a session */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1109 | static int |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1110 | ssh_session2_open(void) |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1111 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1112 | Channel *c; |
| 1113 | int window, packetmax, in, out, err; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1114 | |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 1115 | if (stdin_null_flag) { |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1116 | in = open(_PATH_DEVNULL, O_RDONLY); |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 1117 | } else { |
| 1118 | in = dup(STDIN_FILENO); |
| 1119 | } |
| 1120 | out = dup(STDOUT_FILENO); |
| 1121 | err = dup(STDERR_FILENO); |
| 1122 | |
| 1123 | if (in < 0 || out < 0 || err < 0) |
| 1124 | fatal("dup() in/out/err failed"); |
| 1125 | |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 1126 | /* enable nonblocking unless tty */ |
| 1127 | if (!isatty(in)) |
| 1128 | set_nonblock(in); |
| 1129 | if (!isatty(out)) |
| 1130 | set_nonblock(out); |
| 1131 | if (!isatty(err)) |
| 1132 | set_nonblock(err); |
| 1133 | |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1134 | window = CHAN_SES_WINDOW_DEFAULT; |
| 1135 | packetmax = CHAN_SES_PACKET_DEFAULT; |
Damien Miller | 19a5945 | 2002-02-19 15:20:57 +1100 | [diff] [blame] | 1136 | if (tty_flag) { |
| 1137 | window >>= 1; |
| 1138 | packetmax >>= 1; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1139 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1140 | c = channel_new( |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1141 | "session", SSH_CHANNEL_OPENING, in, out, err, |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1142 | window, packetmax, CHAN_EXTENDED_WRITE, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1143 | "client-session", /*nonblock*/0); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1144 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1145 | debug3("ssh_session2_open: channel_new: %d", c->self); |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1146 | |
Ben Lindstrom | 5ec2645 | 2001-06-09 00:18:51 +0000 | [diff] [blame] | 1147 | channel_send_open(c->self); |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1148 | if (!no_shell_flag) |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1149 | channel_register_confirm(c->self, ssh_session2_setup, NULL); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1150 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1151 | return c->self; |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1152 | } |
| 1153 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1154 | static int |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1155 | ssh_session2(void) |
| 1156 | { |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1157 | int id = -1; |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1158 | |
| 1159 | /* XXX should be pre-session */ |
| 1160 | ssh_init_forwarding(); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1161 | ssh_control_listener(); |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1162 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1163 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
| 1164 | id = ssh_session2_open(); |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1165 | |
| 1166 | /* If requested, let ssh continue in the background. */ |
| 1167 | if (fork_after_authentication_flag) |
| 1168 | if (daemon(1, 1) < 0) |
| 1169 | fatal("daemon() failed: %.200s", strerror(errno)); |
| 1170 | |
Ben Lindstrom | 2b1f71b | 2001-06-05 20:32:21 +0000 | [diff] [blame] | 1171 | return client_loop(tty_flag, tty_flag ? |
| 1172 | options.escape_char : SSH_ESCAPECHAR_NONE, id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1173 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1174 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1175 | static void |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1176 | load_public_identity_files(void) |
| 1177 | { |
| 1178 | char *filename; |
Ben Lindstrom | 711b04a | 2001-08-06 21:12:42 +0000 | [diff] [blame] | 1179 | int i = 0; |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1180 | Key *public; |
Ben Lindstrom | 711b04a | 2001-08-06 21:12:42 +0000 | [diff] [blame] | 1181 | #ifdef SMARTCARD |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1182 | Key **keys; |
| 1183 | |
Ben Lindstrom | f7db3bb | 2001-08-06 21:35:51 +0000 | [diff] [blame] | 1184 | if (options.smartcard_device != NULL && |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1185 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
| 1186 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { |
| 1187 | int count = 0; |
| 1188 | for (i = 0; keys[i] != NULL; i++) { |
| 1189 | count++; |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1190 | memmove(&options.identity_files[1], &options.identity_files[0], |
| 1191 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); |
| 1192 | memmove(&options.identity_keys[1], &options.identity_keys[0], |
| 1193 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); |
| 1194 | options.num_identity_files++; |
| 1195 | options.identity_keys[0] = keys[i]; |
Damien Miller | 56a0bb0 | 2003-06-18 20:28:40 +1000 | [diff] [blame] | 1196 | options.identity_files[0] = sc_get_key_label(keys[i]); |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1197 | } |
Ben Lindstrom | 4f05460 | 2002-03-26 03:23:00 +0000 | [diff] [blame] | 1198 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) |
| 1199 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; |
Ben Lindstrom | 0936a5b | 2002-03-26 03:17:42 +0000 | [diff] [blame] | 1200 | i = count; |
| 1201 | xfree(keys); |
Ben Lindstrom | 711b04a | 2001-08-06 21:12:42 +0000 | [diff] [blame] | 1202 | } |
Ben Lindstrom | ffce147 | 2001-08-06 21:57:31 +0000 | [diff] [blame] | 1203 | #endif /* SMARTCARD */ |
Ben Lindstrom | 711b04a | 2001-08-06 21:12:42 +0000 | [diff] [blame] | 1204 | for (; i < options.num_identity_files; i++) { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1205 | filename = tilde_expand_filename(options.identity_files[i], |
| 1206 | original_real_uid); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 1207 | public = key_load_public(filename, NULL); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1208 | debug("identity file %s type %d", filename, |
| 1209 | public ? public->type : -1); |
| 1210 | xfree(options.identity_files[i]); |
| 1211 | options.identity_files[i] = filename; |
| 1212 | options.identity_keys[i] = public; |
| 1213 | } |
| 1214 | } |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1215 | |
| 1216 | static void |
| 1217 | control_client_sighandler(int signo) |
| 1218 | { |
| 1219 | control_client_terminate = signo; |
| 1220 | } |
| 1221 | |
| 1222 | static void |
| 1223 | control_client_sigrelay(int signo) |
| 1224 | { |
| 1225 | if (control_server_pid > 1) |
| 1226 | kill(control_server_pid, signo); |
| 1227 | } |
| 1228 | |
Darren Tucker | 365433f | 2004-06-22 12:29:23 +1000 | [diff] [blame] | 1229 | static int |
| 1230 | env_permitted(char *env) |
| 1231 | { |
| 1232 | int i; |
| 1233 | char name[1024], *cp; |
| 1234 | |
| 1235 | strlcpy(name, env, sizeof(name)); |
| 1236 | if ((cp = strchr(name, '=')) == NULL) |
| 1237 | return (0); |
| 1238 | |
| 1239 | *cp = '\0'; |
| 1240 | |
| 1241 | for (i = 0; i < options.num_send_env; i++) |
| 1242 | if (match_pattern(name, options.send_env[i])) |
| 1243 | return (1); |
| 1244 | |
| 1245 | return (0); |
| 1246 | } |
| 1247 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1248 | static void |
| 1249 | control_client(const char *path) |
| 1250 | { |
| 1251 | struct sockaddr_un addr; |
Darren Tucker | 365433f | 2004-06-22 12:29:23 +1000 | [diff] [blame] | 1252 | int i, r, sock, exitval, num_env, addr_len; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1253 | Buffer m; |
| 1254 | char *cp; |
Damien Miller | 3756dce | 2004-06-18 01:17:29 +1000 | [diff] [blame] | 1255 | extern char **environ; |
Darren Tucker | fc95970 | 2004-07-17 16:12:08 +1000 | [diff] [blame] | 1256 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1257 | memset(&addr, '\0', sizeof(addr)); |
| 1258 | addr.sun_family = AF_UNIX; |
Damien Miller | 07b6ff1 | 2004-06-15 11:14:45 +1000 | [diff] [blame] | 1259 | addr_len = offsetof(struct sockaddr_un, sun_path) + |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1260 | strlen(path) + 1; |
| 1261 | |
| 1262 | if (strlcpy(addr.sun_path, path, |
| 1263 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) |
| 1264 | fatal("ControlPath too long"); |
| 1265 | |
| 1266 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
| 1267 | fatal("%s socket(): %s", __func__, strerror(errno)); |
| 1268 | |
Damien Miller | 07b6ff1 | 2004-06-15 11:14:45 +1000 | [diff] [blame] | 1269 | if (connect(sock, (struct sockaddr*)&addr, addr_len) == -1) |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1270 | fatal("Couldn't connect to %s: %s", path, strerror(errno)); |
| 1271 | |
| 1272 | if ((cp = getenv("TERM")) == NULL) |
| 1273 | cp = ""; |
| 1274 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1275 | buffer_init(&m); |
| 1276 | |
| 1277 | /* Get PID of controlee */ |
| 1278 | if (ssh_msg_recv(sock, &m) == -1) |
| 1279 | fatal("%s: msg_recv", __func__); |
| 1280 | if (buffer_get_char(&m) != 0) |
| 1281 | fatal("%s: wrong version", __func__); |
Damien Miller | 23f0770 | 2004-06-18 01:19:03 +1000 | [diff] [blame] | 1282 | /* Connection allowed? */ |
| 1283 | if (buffer_get_int(&m) != 1) |
| 1284 | fatal("Connection to master denied"); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1285 | control_server_pid = buffer_get_int(&m); |
| 1286 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1287 | buffer_clear(&m); |
| 1288 | buffer_put_int(&m, tty_flag); |
| 1289 | buffer_put_int(&m, subsystem_flag); |
| 1290 | buffer_put_cstring(&m, cp); |
| 1291 | |
| 1292 | buffer_append(&command, "\0", 1); |
| 1293 | buffer_put_cstring(&m, buffer_ptr(&command)); |
| 1294 | |
Darren Tucker | 365433f | 2004-06-22 12:29:23 +1000 | [diff] [blame] | 1295 | if (options.num_send_env == 0 || environ == NULL) { |
| 1296 | buffer_put_int(&m, 0); |
Darren Tucker | fc95970 | 2004-07-17 16:12:08 +1000 | [diff] [blame] | 1297 | } else { |
Darren Tucker | 365433f | 2004-06-22 12:29:23 +1000 | [diff] [blame] | 1298 | /* Pass environment */ |
| 1299 | num_env = 0; |
| 1300 | for (i = 0; environ[i] != NULL; i++) |
| 1301 | if (env_permitted(environ[i])) |
| 1302 | num_env++; /* Count */ |
Darren Tucker | fc95970 | 2004-07-17 16:12:08 +1000 | [diff] [blame] | 1303 | |
Darren Tucker | 365433f | 2004-06-22 12:29:23 +1000 | [diff] [blame] | 1304 | buffer_put_int(&m, num_env); |
| 1305 | |
Darren Tucker | b5bc1a6 | 2004-06-24 00:34:53 +1000 | [diff] [blame] | 1306 | for (i = 0; environ[i] != NULL && num_env >= 0; i++) |
| 1307 | if (env_permitted(environ[i])) { |
| 1308 | num_env--; |
Darren Tucker | 365433f | 2004-06-22 12:29:23 +1000 | [diff] [blame] | 1309 | buffer_put_cstring(&m, environ[i]); |
Darren Tucker | b5bc1a6 | 2004-06-24 00:34:53 +1000 | [diff] [blame] | 1310 | } |
Darren Tucker | 365433f | 2004-06-22 12:29:23 +1000 | [diff] [blame] | 1311 | } |
Damien Miller | 3756dce | 2004-06-18 01:17:29 +1000 | [diff] [blame] | 1312 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1313 | if (ssh_msg_send(sock, /* version */0, &m) == -1) |
| 1314 | fatal("%s: msg_send", __func__); |
| 1315 | |
| 1316 | mm_send_fd(sock, STDIN_FILENO); |
| 1317 | mm_send_fd(sock, STDOUT_FILENO); |
| 1318 | mm_send_fd(sock, STDERR_FILENO); |
| 1319 | |
| 1320 | /* Wait for reply, so master has a chance to gather ttymodes */ |
| 1321 | buffer_clear(&m); |
| 1322 | if (ssh_msg_recv(sock, &m) == -1) |
| 1323 | fatal("%s: msg_recv", __func__); |
| 1324 | if (buffer_get_char(&m) != 0) |
| 1325 | fatal("%s: master returned error", __func__); |
| 1326 | buffer_free(&m); |
| 1327 | |
Damien Miller | 0809e23 | 2004-06-18 22:20:57 +1000 | [diff] [blame] | 1328 | signal(SIGINT, control_client_sighandler); |
| 1329 | signal(SIGTERM, control_client_sighandler); |
| 1330 | signal(SIGWINCH, control_client_sigrelay); |
| 1331 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1332 | if (tty_flag) |
| 1333 | enter_raw_mode(); |
| 1334 | |
| 1335 | /* Stick around until the controlee closes the client_fd */ |
| 1336 | exitval = 0; |
| 1337 | for (;!control_client_terminate;) { |
| 1338 | r = read(sock, &exitval, sizeof(exitval)); |
| 1339 | if (r == 0) { |
| 1340 | debug2("Received EOF from master"); |
| 1341 | break; |
| 1342 | } |
| 1343 | if (r > 0) |
| 1344 | debug2("Received exit status from master %d", exitval); |
| 1345 | if (r == -1 && errno != EINTR) |
| 1346 | fatal("%s: read %s", __func__, strerror(errno)); |
| 1347 | } |
| 1348 | |
| 1349 | if (control_client_terminate) |
| 1350 | debug2("Exiting on signal %d", control_client_terminate); |
| 1351 | |
| 1352 | close(sock); |
| 1353 | |
| 1354 | leave_raw_mode(); |
| 1355 | |
| 1356 | if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET) |
| 1357 | fprintf(stderr, "Connection to master closed.\r\n"); |
| 1358 | |
| 1359 | exit(exitval); |
| 1360 | } |