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. |
| 16 | * |
| 17 | * Modified to work with SSL by Niels Provos <provos@citi.umich.edu> |
| 18 | * in Canada (German citizen). |
| 19 | * |
| 20 | * Redistribution and use in source and binary forms, with or without |
| 21 | * modification, are permitted provided that the following conditions |
| 22 | * are met: |
| 23 | * 1. Redistributions of source code must retain the above copyright |
| 24 | * notice, this list of conditions and the following disclaimer. |
| 25 | * 2. Redistributions in binary form must reproduce the above copyright |
| 26 | * notice, this list of conditions and the following disclaimer in the |
| 27 | * documentation and/or other materials provided with the distribution. |
| 28 | * |
| 29 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 30 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 31 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 32 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 33 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 34 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 35 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 36 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 37 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 38 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 39 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 40 | |
| 41 | #include "includes.h" |
Damien Miller | 66823cd | 2002-01-22 23:11:38 +1100 | [diff] [blame^] | 42 | RCSID("$OpenBSD: ssh.c,v 1.154 2001/12/27 20:39:58 markus Exp $"); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 43 | |
| 44 | #include <openssl/evp.h> |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 45 | #include <openssl/err.h> |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 46 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 47 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 48 | #include "ssh1.h" |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 49 | #include "ssh2.h" |
| 50 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 51 | #include "cipher.h" |
| 52 | #include "xmalloc.h" |
| 53 | #include "packet.h" |
| 54 | #include "buffer.h" |
| 55 | #include "uidswap.h" |
Ben Lindstrom | c763767 | 2001-06-09 00:36:26 +0000 | [diff] [blame] | 56 | #include "channels.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 57 | #include "key.h" |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 58 | #include "authfd.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 59 | #include "authfile.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 60 | #include "pathnames.h" |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 61 | #include "clientloop.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 62 | #include "log.h" |
| 63 | #include "readconf.h" |
| 64 | #include "sshconnect.h" |
| 65 | #include "tildexpand.h" |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 66 | #include "dispatch.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" |
Ben Lindstrom | ae8e2d3 | 2001-04-14 23:13:02 +0000 | [diff] [blame] | 70 | #include "sshtty.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 71 | |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 72 | #ifdef SMARTCARD |
| 73 | #include <openssl/engine.h> |
| 74 | #include "scard.h" |
Ben Lindstrom | bcc1808 | 2001-08-06 21:59:25 +0000 | [diff] [blame] | 75 | #endif |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 76 | |
Damien Miller | 3f90587 | 1999-11-15 17:10:57 +1100 | [diff] [blame] | 77 | #ifdef HAVE___PROGNAME |
| 78 | extern char *__progname; |
Ben Lindstrom | 49a79c0 | 2000-11-17 03:47:20 +0000 | [diff] [blame] | 79 | #else |
| 80 | char *__progname; |
| 81 | #endif |
Damien Miller | 3f90587 | 1999-11-15 17:10:57 +1100 | [diff] [blame] | 82 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 83 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
| 84 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ |
Damien Miller | 7d80e34 | 2000-01-19 14:36:49 +1100 | [diff] [blame] | 85 | #ifdef IPV4_DEFAULT |
| 86 | int IPv4or6 = AF_INET; |
| 87 | #else |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 88 | int IPv4or6 = AF_UNSPEC; |
Damien Miller | 7d80e34 | 2000-01-19 14:36:49 +1100 | [diff] [blame] | 89 | #endif |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 90 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 91 | /* 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] | 92 | int debug_flag = 0; |
| 93 | |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 94 | /* Flag indicating whether a tty should be allocated */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 95 | int tty_flag = 0; |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 96 | int no_tty_flag = 0; |
| 97 | int force_tty_flag = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 98 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 99 | /* don't exec a shell */ |
| 100 | int no_shell_flag = 0; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 101 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 102 | /* |
| 103 | * Flag indicating that nothing should be read from stdin. This can be set |
| 104 | * on the command line. |
| 105 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 106 | int stdin_null_flag = 0; |
| 107 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 108 | /* |
| 109 | * Flag indicating that ssh should fork after authentication. This is useful |
| 110 | * so that the pasphrase can be entered manually, and then ssh goes to the |
| 111 | * background. |
| 112 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 113 | int fork_after_authentication_flag = 0; |
| 114 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 115 | /* |
| 116 | * General data structure for command line options and options configurable |
| 117 | * in configuration files. See readconf.h. |
| 118 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 119 | Options options; |
| 120 | |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 121 | /* optional user configfile */ |
| 122 | char *config = NULL; |
| 123 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 124 | /* |
| 125 | * Name of the host we are connecting to. This is the name given on the |
| 126 | * command line, or the HostName specified for the user-supplied name in a |
| 127 | * configuration file. |
| 128 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 129 | char *host; |
| 130 | |
| 131 | /* socket address the host resolves to */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 132 | struct sockaddr_storage hostaddr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 133 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 134 | /* Private host keys. */ |
| 135 | struct { |
| 136 | Key **keys; |
| 137 | int nkeys; |
| 138 | } sensitive_data; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 139 | |
| 140 | /* Original real UID. */ |
| 141 | uid_t original_real_uid; |
| 142 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 143 | /* command to be executed */ |
| 144 | Buffer command; |
| 145 | |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 146 | /* Should we execute a command or invoke a subsystem? */ |
| 147 | int subsystem_flag = 0; |
| 148 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 149 | /* Prints a help message to the user. This function never returns. */ |
| 150 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 151 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 152 | usage(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 153 | { |
Kevin Steves | ec84dc1 | 2000-12-13 17:45:15 +0000 | [diff] [blame] | 154 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 155 | fprintf(stderr, "Options:\n"); |
| 156 | fprintf(stderr, " -l user Log in using this user name.\n"); |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 157 | fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 158 | fprintf(stderr, " -F config Config file (default: ~/%s).\n", |
| 159 | _PATH_SSH_USER_CONFFILE); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 160 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
Ben Lindstrom | 3b89c5e | 2001-06-05 20:44:16 +0000 | [diff] [blame] | 161 | fprintf(stderr, " -a Disable authentication agent forwarding (default).\n"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 162 | #ifdef AFS |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 163 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
| 164 | #endif /* AFS */ |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 165 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
Ben Lindstrom | 3b89c5e | 2001-06-05 20:44:16 +0000 | [diff] [blame] | 166 | fprintf(stderr, " -x Disable X11 connection forwarding (default).\n"); |
Ben Lindstrom | 0ab2a01 | 2001-03-05 06:45:21 +0000 | [diff] [blame] | 167 | fprintf(stderr, " -i file Identity for public key authentication " |
| 168 | "(default: ~/.ssh/identity)\n"); |
Ben Lindstrom | 61eb956 | 2001-08-06 21:53:42 +0000 | [diff] [blame] | 169 | #ifdef SMARTCARD |
| 170 | fprintf(stderr, " -I reader Set smartcard reader.\n"); |
Ben Lindstrom | bcc1808 | 2001-08-06 21:59:25 +0000 | [diff] [blame] | 171 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 172 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 173 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 174 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 175 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 176 | fprintf(stderr, " -V Display version number only.\n"); |
| 177 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); |
| 178 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); |
| 179 | fprintf(stderr, " -f Fork into background after authentication.\n"); |
| 180 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 181 | |
Ben Lindstrom | 3b89c5e | 2001-06-05 20:44:16 +0000 | [diff] [blame] | 182 | fprintf(stderr, " -c cipher Select encryption algorithm\n"); |
Ben Lindstrom | 3d73a34 | 2001-03-05 07:39:01 +0000 | [diff] [blame] | 183 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 184 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); |
| 185 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); |
| 186 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); |
Kevin Steves | ec84dc1 | 2000-12-13 17:45:15 +0000 | [diff] [blame] | 187 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 188 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
Ben Lindstrom | 19ceb17 | 2001-09-12 17:54:24 +0000 | [diff] [blame] | 189 | fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 190 | fprintf(stderr, " -C Enable compression.\n"); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 191 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 192 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 193 | fprintf(stderr, " -1 Force protocol version 1.\n"); |
| 194 | fprintf(stderr, " -2 Force protocol version 2.\n"); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 195 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
| 196 | fprintf(stderr, " -6 Use IPv6 only.\n"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 197 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 198 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
Ben Lindstrom | 3b89c5e | 2001-06-05 20:44:16 +0000 | [diff] [blame] | 199 | fprintf(stderr, " -b addr Local IP address.\n"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 200 | exit(1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 201 | } |
| 202 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 203 | /* |
| 204 | * Connects to the given host using rsh (or prints an error message and exits |
| 205 | * if rsh is not available). This function never returns. |
| 206 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 207 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 208 | rsh_connect(char *host, char *user, Buffer * command) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 209 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 210 | char *args[10]; |
| 211 | int i; |
| 212 | |
| 213 | log("Using rsh. WARNING: Connection will not be encrypted."); |
| 214 | /* Build argument list for rsh. */ |
| 215 | i = 0; |
| 216 | args[i++] = _PATH_RSH; |
| 217 | /* host may have to come after user on some systems */ |
| 218 | args[i++] = host; |
| 219 | if (user) { |
| 220 | args[i++] = "-l"; |
| 221 | args[i++] = user; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 222 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 223 | if (buffer_len(command) > 0) { |
| 224 | buffer_append(command, "\0", 1); |
| 225 | args[i++] = buffer_ptr(command); |
| 226 | } |
| 227 | args[i++] = NULL; |
| 228 | if (debug_flag) { |
| 229 | for (i = 0; args[i]; i++) { |
| 230 | if (i != 0) |
| 231 | fprintf(stderr, " "); |
| 232 | fprintf(stderr, "%s", args[i]); |
| 233 | } |
| 234 | fprintf(stderr, "\n"); |
| 235 | } |
| 236 | execv(_PATH_RSH, args); |
| 237 | perror(_PATH_RSH); |
| 238 | exit(1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 239 | } |
| 240 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 241 | static int ssh_session(void); |
| 242 | static int ssh_session2(void); |
| 243 | static void load_public_identity_files(void); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 244 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 245 | /* |
| 246 | * Main program for the ssh client. |
| 247 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 248 | int |
| 249 | main(int ac, char **av) |
| 250 | { |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 251 | int i, opt, exit_status, cerr; |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 252 | u_short fwd_port, fwd_host_port; |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 253 | char sfwd_port[6], sfwd_host_port[6]; |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 254 | char *p, *cp, buf[256]; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 255 | struct stat st; |
Ben Lindstrom | 086cf21 | 2001-03-05 05:56:40 +0000 | [diff] [blame] | 256 | struct passwd *pw; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 257 | int dummy; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 258 | uid_t original_effective_uid; |
Ben Lindstrom | 5ccf63a | 2001-09-24 20:00:10 +0000 | [diff] [blame] | 259 | extern int optind, optreset; |
Damien Miller | 4f8e669 | 2001-07-14 13:22:53 +1000 | [diff] [blame] | 260 | extern char *optarg; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 261 | |
Ben Lindstrom | 49a79c0 | 2000-11-17 03:47:20 +0000 | [diff] [blame] | 262 | __progname = get_progname(av[0]); |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 263 | init_rng(); |
| 264 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 265 | /* |
| 266 | * Save the original real uid. It will be needed later (uid-swapping |
| 267 | * may clobber the real uid). |
| 268 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 269 | original_real_uid = getuid(); |
| 270 | original_effective_uid = geteuid(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 271 | |
Damien Miller | 05dd795 | 2000-10-01 00:42:48 +1100 | [diff] [blame] | 272 | #ifdef HAVE_SETRLIMIT |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 273 | /* If we are installed setuid root be careful to not drop core. */ |
| 274 | if (original_real_uid != original_effective_uid) { |
| 275 | struct rlimit rlim; |
| 276 | rlim.rlim_cur = rlim.rlim_max = 0; |
| 277 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) |
| 278 | fatal("setrlimit failed: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 279 | } |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 280 | #endif |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 281 | /* Get user data. */ |
| 282 | pw = getpwuid(original_real_uid); |
| 283 | if (!pw) { |
| 284 | log("You don't exist, go away!"); |
| 285 | exit(1); |
| 286 | } |
| 287 | /* Take a copy of the returned structure. */ |
| 288 | pw = pwcopy(pw); |
| 289 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 290 | /* |
| 291 | * Use uid-swapping to give up root privileges for the duration of |
| 292 | * option processing. We will re-instantiate the rights when we are |
| 293 | * ready to create the privileged port, and will permanently drop |
| 294 | * them when the port has been created (actually, when the connection |
| 295 | * has been made, as we may need to create the port several times). |
| 296 | */ |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 297 | temporarily_use_uid(pw); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 298 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 299 | /* |
| 300 | * Set our umask to something reasonable, as some files are created |
| 301 | * with the default umask. This will make them world-readable but |
| 302 | * writable only by the owner, which is ok for all files for which we |
| 303 | * don't set the modes explicitly. |
| 304 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 305 | umask(022); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 306 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 307 | /* Initialize option structure to indicate that no values have been set. */ |
| 308 | initialize_options(&options); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 309 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 310 | /* Parse command-line arguments. */ |
| 311 | host = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 312 | |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 313 | again: |
| 314 | while ((opt = getopt(ac, av, |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 315 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVX")) != -1) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 316 | switch (opt) { |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 317 | case '1': |
| 318 | options.protocol = SSH_PROTO_1; |
| 319 | break; |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 320 | case '2': |
| 321 | options.protocol = SSH_PROTO_2; |
| 322 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 323 | case '4': |
| 324 | IPv4or6 = AF_INET; |
| 325 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 326 | case '6': |
| 327 | IPv4or6 = AF_INET6; |
| 328 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 329 | case 'n': |
| 330 | stdin_null_flag = 1; |
| 331 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 332 | case 'f': |
| 333 | fork_after_authentication_flag = 1; |
| 334 | stdin_null_flag = 1; |
| 335 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 336 | case 'x': |
| 337 | options.forward_x11 = 0; |
| 338 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 339 | case 'X': |
| 340 | options.forward_x11 = 1; |
| 341 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 342 | case 'g': |
| 343 | options.gateway_ports = 1; |
| 344 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 345 | case 'P': |
| 346 | options.use_privileged_port = 0; |
| 347 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 348 | case 'a': |
| 349 | options.forward_agent = 0; |
| 350 | break; |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 351 | case 'A': |
| 352 | options.forward_agent = 1; |
| 353 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 354 | #ifdef AFS |
| 355 | case 'k': |
| 356 | options.kerberos_tgt_passing = 0; |
| 357 | options.afs_token_passing = 0; |
| 358 | break; |
| 359 | #endif |
| 360 | case 'i': |
| 361 | if (stat(optarg, &st) < 0) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 362 | fprintf(stderr, "Warning: Identity file %s " |
| 363 | "does not exist.\n", optarg); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 364 | break; |
| 365 | } |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 366 | if (options.num_identity_files >= |
| 367 | SSH_MAX_IDENTITY_FILES) |
| 368 | fatal("Too many identity files specified " |
| 369 | "(max %d)", SSH_MAX_IDENTITY_FILES); |
| 370 | options.identity_files[options.num_identity_files++] = |
| 371 | xstrdup(optarg); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 372 | break; |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 373 | case 'I': |
| 374 | #ifdef SMARTCARD |
Ben Lindstrom | f7db3bb | 2001-08-06 21:35:51 +0000 | [diff] [blame] | 375 | options.smartcard_device = xstrdup(optarg); |
Ben Lindstrom | bcc1808 | 2001-08-06 21:59:25 +0000 | [diff] [blame] | 376 | #else |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 377 | fprintf(stderr, "no support for smartcards.\n"); |
Ben Lindstrom | bcc1808 | 2001-08-06 21:59:25 +0000 | [diff] [blame] | 378 | #endif |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 379 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 380 | case 't': |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 381 | if (tty_flag) |
| 382 | force_tty_flag = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 383 | tty_flag = 1; |
| 384 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 385 | case 'v': |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 386 | if (0 == debug_flag) { |
| 387 | debug_flag = 1; |
| 388 | options.log_level = SYSLOG_LEVEL_DEBUG1; |
| 389 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { |
| 390 | options.log_level++; |
| 391 | break; |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 392 | } else |
Ben Lindstrom | 6df8ef4 | 2001-03-05 07:47:23 +0000 | [diff] [blame] | 393 | fatal("Too high debugging level."); |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 394 | /* fallthrough */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 395 | case 'V': |
Damien Miller | 225736c | 2001-02-19 21:51:08 +1100 | [diff] [blame] | 396 | fprintf(stderr, |
| 397 | "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 398 | SSH_VERSION, |
| 399 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, |
Damien Miller | 225736c | 2001-02-19 21:51:08 +1100 | [diff] [blame] | 400 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
| 401 | SSLeay()); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 402 | if (opt == 'V') |
| 403 | exit(0); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 404 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 405 | case 'q': |
| 406 | options.log_level = SYSLOG_LEVEL_QUIET; |
| 407 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 408 | case 'e': |
| 409 | if (optarg[0] == '^' && optarg[2] == 0 && |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 410 | (u_char) optarg[1] >= 64 && |
| 411 | (u_char) optarg[1] < 128) |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 412 | options.escape_char = (u_char) optarg[1] & 31; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 413 | else if (strlen(optarg) == 1) |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 414 | options.escape_char = (u_char) optarg[0]; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 415 | else if (strcmp(optarg, "none") == 0) |
Ben Lindstrom | 2b1f71b | 2001-06-05 20:32:21 +0000 | [diff] [blame] | 416 | options.escape_char = SSH_ESCAPECHAR_NONE; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 417 | else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 418 | fprintf(stderr, "Bad escape character '%s'.\n", |
| 419 | optarg); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 420 | exit(1); |
| 421 | } |
| 422 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 423 | case 'c': |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 424 | if (ciphers_valid(optarg)) { |
| 425 | /* SSH2 only */ |
| 426 | options.ciphers = xstrdup(optarg); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 427 | options.cipher = SSH_CIPHER_ILLEGAL; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 428 | } else { |
| 429 | /* SSH1 only */ |
Damien Miller | e39cacc | 2000-11-29 12:18:44 +1100 | [diff] [blame] | 430 | options.cipher = cipher_number(optarg); |
| 431 | if (options.cipher == -1) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 432 | fprintf(stderr, |
| 433 | "Unknown cipher type '%s'\n", |
| 434 | optarg); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 435 | exit(1); |
| 436 | } |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 437 | if (options.cipher == SSH_CIPHER_3DES) |
Damien Miller | e39cacc | 2000-11-29 12:18:44 +1100 | [diff] [blame] | 438 | options.ciphers = "3des-cbc"; |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 439 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
Damien Miller | e39cacc | 2000-11-29 12:18:44 +1100 | [diff] [blame] | 440 | options.ciphers = "blowfish-cbc"; |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 441 | else |
Damien Miller | e39cacc | 2000-11-29 12:18:44 +1100 | [diff] [blame] | 442 | options.ciphers = (char *)-1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 443 | } |
| 444 | break; |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 445 | case 'm': |
| 446 | if (mac_valid(optarg)) |
| 447 | options.macs = xstrdup(optarg); |
| 448 | else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 449 | fprintf(stderr, "Unknown mac type '%s'\n", |
| 450 | optarg); |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 451 | exit(1); |
| 452 | } |
| 453 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 454 | case 'p': |
Ben Lindstrom | 19066a1 | 2001-04-12 23:39:26 +0000 | [diff] [blame] | 455 | options.port = a2port(optarg); |
| 456 | if (options.port == 0) { |
Ben Lindstrom | 146edb9 | 2001-04-11 23:06:28 +0000 | [diff] [blame] | 457 | fprintf(stderr, "Bad port '%s'\n", optarg); |
| 458 | exit(1); |
| 459 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 460 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 461 | case 'l': |
| 462 | options.user = optarg; |
| 463 | break; |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 464 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 465 | case 'L': |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 466 | case 'R': |
| 467 | if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]", |
| 468 | sfwd_port, buf, sfwd_host_port) != 3 && |
| 469 | sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]", |
| 470 | sfwd_port, buf, sfwd_host_port) != 3) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 471 | fprintf(stderr, |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 472 | "Bad forwarding specification '%s'\n", |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 473 | optarg); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 474 | usage(); |
| 475 | /* NOTREACHED */ |
| 476 | } |
Ben Lindstrom | 1a17471 | 2001-09-12 17:56:15 +0000 | [diff] [blame] | 477 | if ((fwd_port = a2port(sfwd_port)) == 0 || |
| 478 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { |
| 479 | fprintf(stderr, |
| 480 | "Bad forwarding port(s) '%s'\n", optarg); |
| 481 | exit(1); |
| 482 | } |
| 483 | if (opt == 'L') |
| 484 | add_local_forward(&options, fwd_port, buf, |
| 485 | fwd_host_port); |
| 486 | else if (opt == 'R') |
| 487 | add_remote_forward(&options, fwd_port, buf, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 488 | fwd_host_port); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 489 | break; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 490 | |
| 491 | case 'D': |
Ben Lindstrom | 19066a1 | 2001-04-12 23:39:26 +0000 | [diff] [blame] | 492 | fwd_port = a2port(optarg); |
| 493 | if (fwd_port == 0) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 494 | fprintf(stderr, "Bad dynamic port '%s'\n", |
| 495 | optarg); |
Ben Lindstrom | 146edb9 | 2001-04-11 23:06:28 +0000 | [diff] [blame] | 496 | exit(1); |
| 497 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 498 | add_local_forward(&options, fwd_port, "socks4", 0); |
| 499 | break; |
| 500 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 501 | case 'C': |
| 502 | options.compression = 1; |
| 503 | break; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 504 | case 'N': |
| 505 | no_shell_flag = 1; |
| 506 | no_tty_flag = 1; |
| 507 | break; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 508 | case 'T': |
| 509 | no_tty_flag = 1; |
| 510 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 511 | case 'o': |
| 512 | dummy = 1; |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 513 | if (process_config_line(&options, host ? host : "", |
| 514 | optarg, "command-line", 0, &dummy) != 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 515 | exit(1); |
| 516 | break; |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 517 | case 's': |
| 518 | subsystem_flag = 1; |
| 519 | break; |
Ben Lindstrom | e0f8804 | 2001-04-30 13:06:24 +0000 | [diff] [blame] | 520 | case 'b': |
| 521 | options.bind_address = optarg; |
| 522 | break; |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 523 | case 'F': |
| 524 | config = optarg; |
| 525 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 526 | default: |
| 527 | usage(); |
| 528 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 529 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 530 | |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 531 | ac -= optind; |
| 532 | av += optind; |
| 533 | |
| 534 | if (ac > 0 && !host && **av != '-') { |
| 535 | if (strchr(*av, '@')) { |
| 536 | p = xstrdup(*av); |
| 537 | cp = strchr(p, '@'); |
| 538 | if (cp == NULL || cp == p) |
| 539 | usage(); |
| 540 | options.user = p; |
| 541 | *cp = '\0'; |
| 542 | host = ++cp; |
| 543 | } else |
| 544 | host = *av; |
| 545 | ac--, av++; |
| 546 | if (ac > 0) { |
| 547 | optind = 0; |
| 548 | optreset = 1; |
| 549 | goto again; |
| 550 | } |
| 551 | } |
| 552 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 553 | /* Check that we got a host name. */ |
| 554 | if (!host) |
| 555 | usage(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 556 | |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 557 | SSLeay_add_all_algorithms(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 558 | ERR_load_crypto_strings(); |
Ben Lindstrom | 908afed | 2001-10-03 17:34:59 +0000 | [diff] [blame] | 559 | channel_set_af(IPv4or6); |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 560 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 561 | /* Initialize the command to execute on remote host. */ |
| 562 | buffer_init(&command); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 563 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 564 | /* |
| 565 | * Save the command to execute on the remote host in a buffer. There |
| 566 | * is no limit on the length of the command, except by the maximum |
| 567 | * packet size. Also sets the tty flag if there is no command. |
| 568 | */ |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 569 | if (!ac) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 570 | /* No command specified - execute shell on a tty. */ |
| 571 | tty_flag = 1; |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 572 | if (subsystem_flag) { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 573 | fprintf(stderr, |
| 574 | "You must specify a subsystem to invoke.\n"); |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 575 | usage(); |
| 576 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 577 | } else { |
Damien Miller | f461445 | 2001-07-14 12:18:10 +1000 | [diff] [blame] | 578 | /* A command has been specified. Store it into the buffer. */ |
| 579 | for (i = 0; i < ac; i++) { |
| 580 | if (i) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 581 | buffer_append(&command, " ", 1); |
| 582 | buffer_append(&command, av[i], strlen(av[i])); |
| 583 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 584 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 585 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 586 | /* Cannot fork to background if no command. */ |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 587 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 588 | fatal("Cannot fork into background without a command to execute."); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 589 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 590 | /* Allocate a tty by default if no command specified. */ |
| 591 | if (buffer_len(&command) == 0) |
| 592 | tty_flag = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 593 | |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 594 | /* Force no tty*/ |
| 595 | if (no_tty_flag) |
| 596 | tty_flag = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 597 | /* Do not allocate a tty if stdin is not a tty. */ |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 598 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 599 | if (tty_flag) |
Ben Lindstrom | 6df8ef4 | 2001-03-05 07:47:23 +0000 | [diff] [blame] | 600 | log("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 601 | tty_flag = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 602 | } |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 603 | |
Ben Lindstrom | 8a432f5 | 2001-03-05 07:24:46 +0000 | [diff] [blame] | 604 | /* |
| 605 | * Initialize "log" output. Since we are the client all output |
| 606 | * actually goes to stderr. |
| 607 | */ |
Ben Lindstrom | 2b64652 | 2001-04-12 16:16:57 +0000 | [diff] [blame] | 608 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
| 609 | SYSLOG_FACILITY_USER, 1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 610 | |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 611 | /* |
| 612 | * Read per-user configuration file. Ignore the system wide config |
| 613 | * file if the user specifies a config file on the command line. |
| 614 | */ |
| 615 | if (config != NULL) { |
Ben Lindstrom | edc0cf2 | 2001-09-12 18:32:20 +0000 | [diff] [blame] | 616 | if (!read_config_file(config, host, &options)) |
| 617 | fatal("Can't open user config file %.100s: " |
| 618 | "%.100s", config, strerror(errno)); |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 619 | } else { |
| 620 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, |
| 621 | _PATH_SSH_USER_CONFFILE); |
Ben Lindstrom | edc0cf2 | 2001-09-12 18:32:20 +0000 | [diff] [blame] | 622 | (void)read_config_file(buf, host, &options); |
Ben Lindstrom | 83f07d1 | 2001-10-03 17:22:29 +0000 | [diff] [blame] | 623 | |
| 624 | /* Read systemwide configuration file after use config. */ |
| 625 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
Ben Lindstrom | 14f31ab | 2001-09-12 17:48:04 +0000 | [diff] [blame] | 626 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 627 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 628 | /* Fill configuration defaults. */ |
| 629 | fill_default_options(&options); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 630 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 631 | /* reinit */ |
Ben Lindstrom | 8a432f5 | 2001-03-05 07:24:46 +0000 | [diff] [blame] | 632 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 633 | |
Damien Miller | 60bc517 | 2001-03-19 09:38:15 +1100 | [diff] [blame] | 634 | seed_rng(); |
| 635 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 636 | if (options.user == NULL) |
| 637 | options.user = xstrdup(pw->pw_name); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 638 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 639 | if (options.hostname != NULL) |
| 640 | host = options.hostname; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 641 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 642 | /* Disable rhosts authentication if not running as root. */ |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 643 | #ifdef HAVE_CYGWIN |
| 644 | /* Ignore uid if running under Windows */ |
| 645 | if (!options.use_privileged_port) { |
| 646 | #else |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 647 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 648 | #endif |
Kevin Steves | fcec7f8 | 2000-12-15 19:55:48 +0000 | [diff] [blame] | 649 | debug("Rhosts Authentication disabled, " |
| 650 | "originating port will not be trusted."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 651 | options.rhosts_authentication = 0; |
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 | * If using rsh has been selected, exec it now (without trying |
| 655 | * anything else). Note that we must release privileges first. |
| 656 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 657 | if (options.use_rsh) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 658 | /* |
| 659 | * Restore our superuser privileges. This must be done |
| 660 | * before permanently setting the uid. |
| 661 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 662 | restore_uid(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 663 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 664 | /* Switch to the original uid permanently. */ |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 665 | permanently_set_uid(pw); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 666 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 667 | /* Execute rsh. */ |
| 668 | rsh_connect(host, options.user, &command); |
| 669 | fatal("rsh_connect returned"); |
| 670 | } |
| 671 | /* Restore our superuser privileges. */ |
| 672 | restore_uid(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 673 | |
Kevin Steves | fcec7f8 | 2000-12-15 19:55:48 +0000 | [diff] [blame] | 674 | /* Open a connection to the remote host. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 675 | |
Damien Miller | 139d4cd | 2001-10-10 15:07:44 +1000 | [diff] [blame] | 676 | cerr = ssh_connect(host, &hostaddr, options.port, IPv4or6, |
Kevin Steves | fcec7f8 | 2000-12-15 19:55:48 +0000 | [diff] [blame] | 677 | options.connection_attempts, |
| 678 | original_effective_uid != 0 || !options.use_privileged_port, |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 679 | pw, options.proxy_command); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 680 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 681 | /* |
| 682 | * If we successfully made the connection, load the host private key |
| 683 | * in case we will need it later for combined rsa-rhosts |
| 684 | * authentication. This must be done before releasing extra |
| 685 | * privileges, because the file is only readable by root. |
| 686 | */ |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 687 | sensitive_data.nkeys = 0; |
| 688 | sensitive_data.keys = NULL; |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 689 | if (!cerr && (options.rhosts_rsa_authentication || |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 690 | options.hostbased_authentication)) { |
| 691 | sensitive_data.nkeys = 3; |
| 692 | sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key)); |
| 693 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 694 | _PATH_HOST_KEY_FILE, "", NULL); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 695 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
| 696 | _PATH_HOST_DSA_KEY_FILE, "", NULL); |
| 697 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, |
| 698 | _PATH_HOST_RSA_KEY_FILE, "", NULL); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 699 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 700 | /* |
| 701 | * Get rid of any extra privileges that we may have. We will no |
| 702 | * longer need them. Also, extra privileges could make it very hard |
| 703 | * to read identity files and other non-world-readable files from the |
| 704 | * user's home directory if it happens to be on a NFS volume where |
| 705 | * root is mapped to nobody. |
| 706 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 707 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 708 | /* |
| 709 | * Note that some legacy systems need to postpone the following call |
| 710 | * to permanently_set_uid() until the private hostkey is destroyed |
| 711 | * with RSA_free(). Otherwise the calling user could ptrace() the |
| 712 | * process, read the private hostkey and impersonate the host. |
| 713 | * OpenBSD does not allow ptracing of setuid processes. |
| 714 | */ |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 715 | permanently_set_uid(pw); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 716 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 717 | /* |
| 718 | * Now that we are back to our own permissions, create ~/.ssh |
| 719 | * directory if it doesn\'t already exist. |
| 720 | */ |
Ben Lindstrom | 930b14a | 2001-08-15 23:19:21 +0000 | [diff] [blame] | 721 | 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] | 722 | if (stat(buf, &st) < 0) |
Damien Miller | be484b5 | 2000-07-15 14:14:16 +1000 | [diff] [blame] | 723 | if (mkdir(buf, 0700) < 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 724 | error("Could not create directory '%.200s'.", buf); |
| 725 | |
| 726 | /* Check if the connection failed, and try "rsh" if appropriate. */ |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 727 | if (cerr) { |
| 728 | if (!options.fallback_to_rsh) |
| 729 | exit(1); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 730 | if (options.port != 0) |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 731 | log("Secure connection to %.100s on port %hu refused; " |
| 732 | "reverting to insecure method", |
| 733 | host, options.port); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 734 | else |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 735 | log("Secure connection to %.100s refused; " |
| 736 | "reverting to insecure method.", host); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 737 | |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 738 | rsh_connect(host, options.user, &command); |
| 739 | fatal("rsh_connect returned"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 740 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 741 | /* load options.identity_files */ |
| 742 | load_public_identity_files(); |
| 743 | |
| 744 | /* Expand ~ in known host file names. */ |
| 745 | /* XXX mem-leaks: */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 746 | options.system_hostfile = |
| 747 | tilde_expand_filename(options.system_hostfile, original_real_uid); |
| 748 | options.user_hostfile = |
| 749 | tilde_expand_filename(options.user_hostfile, original_real_uid); |
| 750 | options.system_hostfile2 = |
| 751 | tilde_expand_filename(options.system_hostfile2, original_real_uid); |
| 752 | options.user_hostfile2 = |
| 753 | tilde_expand_filename(options.user_hostfile2, original_real_uid); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 754 | |
Damien Miller | 07cd589 | 2001-11-12 10:52:03 +1100 | [diff] [blame] | 755 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
| 756 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 757 | /* Log into the remote system. This never returns if the login fails. */ |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 758 | ssh_login(sensitive_data.keys, sensitive_data.nkeys, |
| 759 | host, (struct sockaddr *)&hostaddr, pw); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 760 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 761 | /* We no longer need the private host keys. Clear them now. */ |
| 762 | if (sensitive_data.nkeys != 0) { |
| 763 | for (i = 0; i < sensitive_data.nkeys; i++) { |
| 764 | if (sensitive_data.keys[i] != NULL) { |
| 765 | /* Destroys contents safely */ |
| 766 | debug3("clear hostkey %d", i); |
| 767 | key_free(sensitive_data.keys[i]); |
| 768 | sensitive_data.keys[i] = NULL; |
| 769 | } |
| 770 | } |
| 771 | xfree(sensitive_data.keys); |
| 772 | } |
Ben Lindstrom | a6c8a8d | 2001-08-06 21:42:00 +0000 | [diff] [blame] | 773 | for (i = 0; i < options.num_identity_files; i++) { |
| 774 | if (options.identity_files[i]) { |
| 775 | xfree(options.identity_files[i]); |
| 776 | options.identity_files[i] = NULL; |
| 777 | } |
| 778 | if (options.identity_keys[i]) { |
| 779 | key_free(options.identity_keys[i]); |
| 780 | options.identity_keys[i] = NULL; |
| 781 | } |
| 782 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 783 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 784 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
| 785 | packet_close(); |
| 786 | return exit_status; |
| 787 | } |
| 788 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 789 | static void |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 790 | x11_get_proto(char **_proto, char **_data) |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 791 | { |
| 792 | char line[512]; |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 793 | static char proto[512], data[512]; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 794 | FILE *f; |
| 795 | int got_data = 0, i; |
| 796 | |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 797 | *_proto = proto; |
| 798 | *_data = data; |
| 799 | proto[0] = data[0] = '\0'; |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 800 | if (options.xauth_location) { |
| 801 | /* Try to get Xauthority information for the display. */ |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 802 | snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL, |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 803 | options.xauth_location, getenv("DISPLAY")); |
| 804 | f = popen(line, "r"); |
| 805 | if (f && fgets(line, sizeof(line), f) && |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 806 | sscanf(line, "%*s %511s %511s", proto, data) == 2) |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 807 | got_data = 1; |
| 808 | if (f) |
| 809 | pclose(f); |
| 810 | } |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 811 | /* |
| 812 | * If we didn't get authentication data, just make up some |
| 813 | * data. The forwarding code will check the validity of the |
| 814 | * response anyway, and substitute this data. The X11 |
| 815 | * server, however, will ignore this fake data and use |
| 816 | * whatever authentication mechanisms it was using otherwise |
| 817 | * for the local connection. |
| 818 | */ |
| 819 | if (!got_data) { |
| 820 | u_int32_t rand = 0; |
| 821 | |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 822 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", sizeof proto); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 823 | for (i = 0; i < 16; i++) { |
| 824 | if (i % 4 == 0) |
| 825 | rand = arc4random(); |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 826 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", rand & 0xff); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 827 | rand >>= 8; |
| 828 | } |
| 829 | } |
| 830 | } |
| 831 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 832 | static void |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 833 | ssh_init_forwarding(void) |
| 834 | { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 835 | int success = 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 836 | int i; |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 837 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 838 | /* Initiate local TCP/IP port forwardings. */ |
| 839 | for (i = 0; i < options.num_local_forwards; i++) { |
| 840 | debug("Connections to local port %d forwarded to remote address %.200s:%d", |
| 841 | options.local_forwards[i].port, |
| 842 | options.local_forwards[i].host, |
| 843 | options.local_forwards[i].host_port); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 844 | success += channel_request_local_forwarding( |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 845 | options.local_forwards[i].port, |
| 846 | options.local_forwards[i].host, |
| 847 | options.local_forwards[i].host_port, |
| 848 | options.gateway_ports); |
| 849 | } |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 850 | if (i > 0 && success == 0) |
| 851 | error("Could not request local forwarding."); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 852 | |
| 853 | /* Initiate remote TCP/IP port forwardings. */ |
| 854 | for (i = 0; i < options.num_remote_forwards; i++) { |
| 855 | debug("Connections to remote port %d forwarded to local address %.200s:%d", |
| 856 | options.remote_forwards[i].port, |
| 857 | options.remote_forwards[i].host, |
| 858 | options.remote_forwards[i].host_port); |
| 859 | channel_request_remote_forwarding( |
| 860 | options.remote_forwards[i].port, |
| 861 | options.remote_forwards[i].host, |
| 862 | options.remote_forwards[i].host_port); |
| 863 | } |
| 864 | } |
| 865 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 866 | static void |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 867 | check_agent_present(void) |
| 868 | { |
| 869 | if (options.forward_agent) { |
| 870 | /* Clear agent forwarding if we don\'t have an agent. */ |
| 871 | int authfd = ssh_get_authentication_socket(); |
| 872 | if (authfd < 0) |
| 873 | options.forward_agent = 0; |
| 874 | else |
| 875 | ssh_close_authentication_socket(authfd); |
| 876 | } |
| 877 | } |
| 878 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 879 | static int |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 880 | ssh_session(void) |
| 881 | { |
| 882 | int type; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 883 | int plen; |
| 884 | int interactive = 0; |
| 885 | int have_tty = 0; |
| 886 | struct winsize ws; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 887 | char *cp; |
| 888 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 889 | /* Enable compression if requested. */ |
| 890 | if (options.compression) { |
| 891 | debug("Requesting compression at level %d.", options.compression_level); |
| 892 | |
| 893 | if (options.compression_level < 1 || options.compression_level > 9) |
| 894 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); |
| 895 | |
| 896 | /* Send the request. */ |
| 897 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); |
| 898 | packet_put_int(options.compression_level); |
| 899 | packet_send(); |
| 900 | packet_write_wait(); |
| 901 | type = packet_read(&plen); |
| 902 | if (type == SSH_SMSG_SUCCESS) |
| 903 | packet_start_compression(options.compression_level); |
| 904 | else if (type == SSH_SMSG_FAILURE) |
| 905 | log("Warning: Remote host refused compression."); |
| 906 | else |
| 907 | packet_disconnect("Protocol error waiting for compression response."); |
| 908 | } |
| 909 | /* Allocate a pseudo tty if appropriate. */ |
| 910 | if (tty_flag) { |
| 911 | debug("Requesting pty."); |
| 912 | |
| 913 | /* Start the packet. */ |
| 914 | packet_start(SSH_CMSG_REQUEST_PTY); |
| 915 | |
| 916 | /* Store TERM in the packet. There is no limit on the |
| 917 | length of the string. */ |
| 918 | cp = getenv("TERM"); |
| 919 | if (!cp) |
| 920 | cp = ""; |
Ben Lindstrom | 664408d | 2001-06-09 01:42:01 +0000 | [diff] [blame] | 921 | packet_put_cstring(cp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 922 | |
| 923 | /* Store window size in the packet. */ |
| 924 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
| 925 | memset(&ws, 0, sizeof(ws)); |
| 926 | packet_put_int(ws.ws_row); |
| 927 | packet_put_int(ws.ws_col); |
| 928 | packet_put_int(ws.ws_xpixel); |
| 929 | packet_put_int(ws.ws_ypixel); |
| 930 | |
| 931 | /* Store tty modes in the packet. */ |
Ben Lindstrom | ae8e2d3 | 2001-04-14 23:13:02 +0000 | [diff] [blame] | 932 | tty_make_modes(fileno(stdin), NULL); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 933 | |
| 934 | /* Send the packet, and wait for it to leave. */ |
| 935 | packet_send(); |
| 936 | packet_write_wait(); |
| 937 | |
| 938 | /* Read response from the server. */ |
| 939 | type = packet_read(&plen); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 940 | if (type == SSH_SMSG_SUCCESS) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 941 | interactive = 1; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 942 | have_tty = 1; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 943 | } else if (type == SSH_SMSG_FAILURE) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 944 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
| 945 | else |
| 946 | packet_disconnect("Protocol error waiting for pty request response."); |
| 947 | } |
| 948 | /* Request X11 forwarding if enabled and DISPLAY is set. */ |
| 949 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 950 | char *proto, *data; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 951 | /* Get reasonable local authentication information. */ |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 952 | x11_get_proto(&proto, &data); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 953 | /* Request forwarding with authentication spoofing. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 954 | debug("Requesting X11 forwarding with authentication spoofing."); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 955 | x11_request_forwarding_with_spoofing(0, proto, data); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 956 | |
| 957 | /* Read response from the server. */ |
| 958 | type = packet_read(&plen); |
| 959 | if (type == SSH_SMSG_SUCCESS) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 960 | interactive = 1; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 961 | } else if (type == SSH_SMSG_FAILURE) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 962 | log("Warning: Remote host denied X11 forwarding."); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 963 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 964 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 965 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 966 | } |
| 967 | /* Tell the packet module whether this is an interactive session. */ |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 968 | packet_set_interactive(interactive); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 969 | |
| 970 | /* Request authentication agent forwarding if appropriate. */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 971 | check_agent_present(); |
| 972 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 973 | if (options.forward_agent) { |
| 974 | debug("Requesting authentication agent forwarding."); |
| 975 | auth_request_forwarding(); |
| 976 | |
| 977 | /* Read response from the server. */ |
| 978 | type = packet_read(&plen); |
Damien Miller | 66823cd | 2002-01-22 23:11:38 +1100 | [diff] [blame^] | 979 | packet_done(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 980 | if (type != SSH_SMSG_SUCCESS) |
| 981 | log("Warning: Remote host denied authentication agent forwarding."); |
| 982 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 983 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 984 | /* Initiate port forwardings. */ |
| 985 | ssh_init_forwarding(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 986 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 987 | /* If requested, let ssh continue in the background. */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 988 | if (fork_after_authentication_flag) |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 989 | if (daemon(1, 1) < 0) |
| 990 | fatal("daemon() failed: %.200s", strerror(errno)); |
| 991 | |
| 992 | /* |
| 993 | * If a command was specified on the command line, execute the |
| 994 | * command now. Otherwise request the server to start a shell. |
| 995 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 996 | if (buffer_len(&command) > 0) { |
| 997 | int len = buffer_len(&command); |
| 998 | if (len > 900) |
| 999 | len = 900; |
Damien Miller | 5a6b4fe | 2001-12-21 14:56:54 +1100 | [diff] [blame] | 1000 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1001 | packet_start(SSH_CMSG_EXEC_CMD); |
| 1002 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
| 1003 | packet_send(); |
| 1004 | packet_write_wait(); |
| 1005 | } else { |
| 1006 | debug("Requesting shell."); |
| 1007 | packet_start(SSH_CMSG_EXEC_SHELL); |
| 1008 | packet_send(); |
| 1009 | packet_write_wait(); |
| 1010 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1011 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1012 | /* Enter the interactive session. */ |
Ben Lindstrom | 2b1f71b | 2001-06-05 20:32:21 +0000 | [diff] [blame] | 1013 | return client_loop(have_tty, tty_flag ? |
| 1014 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1015 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1016 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1017 | static void |
Damien Miller | 278f907 | 2001-12-21 15:00:19 +1100 | [diff] [blame] | 1018 | client_subsystem_reply(int type, int plen, u_int32_t seq, void *ctxt) |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 1019 | { |
| 1020 | int id, len; |
| 1021 | |
| 1022 | id = packet_get_int(); |
| 1023 | len = buffer_len(&command); |
Ben Lindstrom | 4040fe1 | 2001-03-05 06:52:57 +0000 | [diff] [blame] | 1024 | if (len > 900) |
| 1025 | len = 900; |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 1026 | packet_done(); |
| 1027 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
| 1028 | fatal("Request for subsystem '%.*s' failed on channel %d", |
Damien Miller | 5a6b4fe | 2001-12-21 14:56:54 +1100 | [diff] [blame] | 1029 | len, (u_char *)buffer_ptr(&command), id); |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 1030 | } |
| 1031 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1032 | /* request pty/x11/agent/tcpfwd/shell for channel */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1033 | static void |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1034 | ssh_session2_setup(int id, void *arg) |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1035 | { |
| 1036 | int len; |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 1037 | int interactive = 0; |
Ben Lindstrom | ae8e2d3 | 2001-04-14 23:13:02 +0000 | [diff] [blame] | 1038 | struct termios tio; |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 1039 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1040 | debug("ssh_session2_setup: id %d", id); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1041 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1042 | if (tty_flag) { |
| 1043 | struct winsize ws; |
| 1044 | char *cp; |
| 1045 | cp = getenv("TERM"); |
| 1046 | if (!cp) |
| 1047 | cp = ""; |
| 1048 | /* Store window size in the packet. */ |
| 1049 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
| 1050 | memset(&ws, 0, sizeof(ws)); |
| 1051 | |
| 1052 | channel_request_start(id, "pty-req", 0); |
| 1053 | packet_put_cstring(cp); |
| 1054 | packet_put_int(ws.ws_col); |
| 1055 | packet_put_int(ws.ws_row); |
| 1056 | packet_put_int(ws.ws_xpixel); |
| 1057 | packet_put_int(ws.ws_ypixel); |
Ben Lindstrom | ae8e2d3 | 2001-04-14 23:13:02 +0000 | [diff] [blame] | 1058 | tio = get_saved_tio(); |
| 1059 | tty_make_modes(/*ignored*/ 0, &tio); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1060 | packet_send(); |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 1061 | interactive = 1; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1062 | /* XXX wait for reply */ |
| 1063 | } |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1064 | if (options.forward_x11 && |
| 1065 | getenv("DISPLAY") != NULL) { |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 1066 | char *proto, *data; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1067 | /* Get reasonable local authentication information. */ |
Ben Lindstrom | 4a4bd71 | 2001-12-06 17:45:19 +0000 | [diff] [blame] | 1068 | x11_get_proto(&proto, &data); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1069 | /* Request forwarding with authentication spoofing. */ |
| 1070 | debug("Requesting X11 forwarding with authentication spoofing."); |
| 1071 | x11_request_forwarding_with_spoofing(id, proto, data); |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 1072 | interactive = 1; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1073 | /* XXX wait for reply */ |
| 1074 | } |
| 1075 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1076 | check_agent_present(); |
| 1077 | if (options.forward_agent) { |
| 1078 | debug("Requesting authentication agent forwarding."); |
| 1079 | channel_request_start(id, "auth-agent-req@openssh.com", 0); |
| 1080 | packet_send(); |
| 1081 | } |
| 1082 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1083 | len = buffer_len(&command); |
| 1084 | if (len > 0) { |
| 1085 | if (len > 900) |
| 1086 | len = 900; |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 1087 | if (subsystem_flag) { |
Damien Miller | 5a6b4fe | 2001-12-21 14:56:54 +1100 | [diff] [blame] | 1088 | debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command)); |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 1089 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
| 1090 | /* register callback for reply */ |
| 1091 | /* XXX we asume that client_loop has already been called */ |
| 1092 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); |
| 1093 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 1094 | } else { |
Damien Miller | 5a6b4fe | 2001-12-21 14:56:54 +1100 | [diff] [blame] | 1095 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
Damien Miller | 832562e | 2001-01-30 09:30:01 +1100 | [diff] [blame] | 1096 | channel_request_start(id, "exec", 0); |
| 1097 | } |
Ben Lindstrom | 4040fe1 | 2001-03-05 06:52:57 +0000 | [diff] [blame] | 1098 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1099 | packet_send(); |
| 1100 | } else { |
| 1101 | channel_request(id, "shell", 0); |
| 1102 | } |
| 1103 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ |
Ben Lindstrom | 1e7d306 | 2001-02-09 02:36:43 +0000 | [diff] [blame] | 1104 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1105 | /* register different callback, etc. XXX */ |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 1106 | packet_set_interactive(interactive); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1107 | } |
| 1108 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1109 | /* open new channel for a session */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1110 | static int |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1111 | ssh_session2_open(void) |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1112 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1113 | Channel *c; |
| 1114 | int window, packetmax, in, out, err; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1115 | |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 1116 | if (stdin_null_flag) { |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1117 | in = open(_PATH_DEVNULL, O_RDONLY); |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 1118 | } else { |
| 1119 | in = dup(STDIN_FILENO); |
| 1120 | } |
| 1121 | out = dup(STDOUT_FILENO); |
| 1122 | err = dup(STDERR_FILENO); |
| 1123 | |
| 1124 | if (in < 0 || out < 0 || err < 0) |
| 1125 | fatal("dup() in/out/err failed"); |
| 1126 | |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 1127 | /* enable nonblocking unless tty */ |
| 1128 | if (!isatty(in)) |
| 1129 | set_nonblock(in); |
| 1130 | if (!isatty(out)) |
| 1131 | set_nonblock(out); |
| 1132 | if (!isatty(err)) |
| 1133 | set_nonblock(err); |
| 1134 | |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1135 | window = CHAN_SES_WINDOW_DEFAULT; |
| 1136 | packetmax = CHAN_SES_PACKET_DEFAULT; |
| 1137 | if (!tty_flag) { |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1138 | window *= 2; |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1139 | packetmax *=2; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1140 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1141 | c = channel_new( |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1142 | "session", SSH_CHANNEL_OPENING, in, out, err, |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1143 | window, packetmax, CHAN_EXTENDED_WRITE, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 1144 | xstrdup("client-session"), /*nonblock*/0); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1145 | if (c == NULL) |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1146 | fatal("ssh_session2_open: channel_new failed"); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1147 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1148 | debug3("ssh_session2_open: channel_new: %d", c->self); |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1149 | |
Ben Lindstrom | 5ec2645 | 2001-06-09 00:18:51 +0000 | [diff] [blame] | 1150 | channel_send_open(c->self); |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1151 | if (!no_shell_flag) |
| 1152 | channel_register_callback(c->self, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1153 | SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, |
| 1154 | ssh_session2_setup, (void *)0); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1155 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1156 | return c->self; |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1157 | } |
| 1158 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1159 | static int |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1160 | ssh_session2(void) |
| 1161 | { |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1162 | int id = -1; |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1163 | |
| 1164 | /* XXX should be pre-session */ |
| 1165 | ssh_init_forwarding(); |
| 1166 | |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 1167 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
| 1168 | id = ssh_session2_open(); |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1169 | |
| 1170 | /* If requested, let ssh continue in the background. */ |
| 1171 | if (fork_after_authentication_flag) |
| 1172 | if (daemon(1, 1) < 0) |
| 1173 | fatal("daemon() failed: %.200s", strerror(errno)); |
| 1174 | |
Ben Lindstrom | 2b1f71b | 2001-06-05 20:32:21 +0000 | [diff] [blame] | 1175 | return client_loop(tty_flag, tty_flag ? |
| 1176 | options.escape_char : SSH_ESCAPECHAR_NONE, id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1177 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1178 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1179 | static void |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1180 | load_public_identity_files(void) |
| 1181 | { |
| 1182 | char *filename; |
| 1183 | Key *public; |
Ben Lindstrom | 711b04a | 2001-08-06 21:12:42 +0000 | [diff] [blame] | 1184 | int i = 0; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1185 | |
Ben Lindstrom | 711b04a | 2001-08-06 21:12:42 +0000 | [diff] [blame] | 1186 | #ifdef SMARTCARD |
Ben Lindstrom | f7db3bb | 2001-08-06 21:35:51 +0000 | [diff] [blame] | 1187 | if (options.smartcard_device != NULL && |
Ben Lindstrom | 711b04a | 2001-08-06 21:12:42 +0000 | [diff] [blame] | 1188 | options.num_identity_files + 1 < SSH_MAX_IDENTITY_FILES && |
Ben Lindstrom | ae996bf | 2001-08-06 21:27:53 +0000 | [diff] [blame] | 1189 | (public = sc_get_key(options.smartcard_device)) != NULL ) { |
Ben Lindstrom | 711b04a | 2001-08-06 21:12:42 +0000 | [diff] [blame] | 1190 | Key *new; |
| 1191 | |
| 1192 | if (options.num_identity_files + 2 > SSH_MAX_IDENTITY_FILES) |
| 1193 | options.num_identity_files = SSH_MAX_IDENTITY_FILES - 2; |
| 1194 | memmove(&options.identity_files[2], &options.identity_files[0], |
| 1195 | sizeof(char *) * options.num_identity_files); |
| 1196 | options.num_identity_files += 2; |
| 1197 | i = 2; |
| 1198 | |
| 1199 | /* XXX ssh1 vs ssh2 */ |
| 1200 | new = key_new(KEY_RSA); |
| 1201 | new->flags = KEY_FLAG_EXT; |
| 1202 | BN_copy(new->rsa->n, public->rsa->n); |
| 1203 | BN_copy(new->rsa->e, public->rsa->e); |
| 1204 | RSA_set_method(new->rsa, sc_get_engine()); |
| 1205 | options.identity_keys[0] = new; |
| 1206 | options.identity_files[0] = xstrdup("smartcard rsa key");; |
| 1207 | |
| 1208 | new = key_new(KEY_RSA1); |
| 1209 | new->flags = KEY_FLAG_EXT; |
| 1210 | BN_copy(new->rsa->n, public->rsa->n); |
| 1211 | BN_copy(new->rsa->e, public->rsa->e); |
| 1212 | RSA_set_method(new->rsa, sc_get_engine()); |
| 1213 | options.identity_keys[1] = new; |
| 1214 | options.identity_files[1] = xstrdup("smartcard rsa1 key"); |
| 1215 | |
| 1216 | key_free(public); |
| 1217 | } |
Ben Lindstrom | ffce147 | 2001-08-06 21:57:31 +0000 | [diff] [blame] | 1218 | #endif /* SMARTCARD */ |
Ben Lindstrom | 711b04a | 2001-08-06 21:12:42 +0000 | [diff] [blame] | 1219 | for (; i < options.num_identity_files; i++) { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1220 | filename = tilde_expand_filename(options.identity_files[i], |
| 1221 | original_real_uid); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 1222 | public = key_load_public(filename, NULL); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1223 | debug("identity file %s type %d", filename, |
| 1224 | public ? public->type : -1); |
| 1225 | xfree(options.identity_files[i]); |
| 1226 | options.identity_files[i] = filename; |
| 1227 | options.identity_keys[i] = public; |
| 1228 | } |
| 1229 | } |