markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame^] | 1 | /* $OpenBSD: sshd.c,v 1.488 2017/05/30 08:52:20 markus Exp $ */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 6 | * This program is the ssh daemon. It listens for connections from clients, |
| 7 | * and performs authentication, executes use commands or shell, and forwards |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 8 | * information to/from the application to the user client over an encrypted |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 9 | * connection. This can also handle forwarding of X11, TCP/IP, and |
| 10 | * authentication agent connections. |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 11 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 12 | * As far as I am concerned, the code I have written for this software |
| 13 | * can be used freely for any purpose. Any derived versions of this |
| 14 | * software must be clearly marked as such, and if the derived work is |
| 15 | * incompatible with the protocol description in the RFC file, it must be |
| 16 | * called by a name other than "ssh" or "Secure Shell". |
| 17 | * |
| 18 | * SSH2 implementation: |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 19 | * Privilege Separation: |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 20 | * |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 21 | * Copyright (c) 2000, 2001, 2002 Markus Friedl. All rights reserved. |
| 22 | * Copyright (c) 2002 Niels Provos. All rights reserved. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 23 | * |
| 24 | * Redistribution and use in source and binary forms, with or without |
| 25 | * modification, are permitted provided that the following conditions |
| 26 | * are met: |
| 27 | * 1. Redistributions of source code must retain the above copyright |
| 28 | * notice, this list of conditions and the following disclaimer. |
| 29 | * 2. Redistributions in binary form must reproduce the above copyright |
| 30 | * notice, this list of conditions and the following disclaimer in the |
| 31 | * documentation and/or other materials provided with the distribution. |
| 32 | * |
| 33 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 34 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 35 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 36 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 37 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 38 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 39 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 40 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 41 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 42 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 43 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 44 | |
| 45 | #include "includes.h" |
Damien Miller | 17e91c0 | 2006-03-15 11:28:34 +1100 | [diff] [blame] | 46 | |
Damien Miller | 9cf6d07 | 2006-03-15 11:29:24 +1100 | [diff] [blame] | 47 | #include <sys/types.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 48 | #include <sys/ioctl.h> |
| 49 | #include <sys/socket.h> |
Damien Miller | f17883e | 2006-03-15 11:45:54 +1100 | [diff] [blame] | 50 | #ifdef HAVE_SYS_STAT_H |
| 51 | # include <sys/stat.h> |
| 52 | #endif |
Damien Miller | 9aec919 | 2006-08-05 10:57:45 +1000 | [diff] [blame] | 53 | #ifdef HAVE_SYS_TIME_H |
| 54 | # include <sys/time.h> |
| 55 | #endif |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 56 | #include "openbsd-compat/sys-tree.h" |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 57 | #include "openbsd-compat/sys-queue.h" |
Damien Miller | 9cf6d07 | 2006-03-15 11:29:24 +1100 | [diff] [blame] | 58 | #include <sys/wait.h> |
Damien Miller | 03e2003 | 2006-03-15 11:16:59 +1100 | [diff] [blame] | 59 | |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 60 | #include <errno.h> |
Damien Miller | 57cf638 | 2006-07-10 21:13:46 +1000 | [diff] [blame] | 61 | #include <fcntl.h> |
Damien Miller | b8fe89c | 2006-07-24 14:51:00 +1000 | [diff] [blame] | 62 | #include <netdb.h> |
Damien Miller | 6645e7a | 2006-03-15 14:42:54 +1100 | [diff] [blame] | 63 | #ifdef HAVE_PATHS_H |
Damien Miller | 03e2003 | 2006-03-15 11:16:59 +1100 | [diff] [blame] | 64 | #include <paths.h> |
Damien Miller | 6645e7a | 2006-03-15 14:42:54 +1100 | [diff] [blame] | 65 | #endif |
Damien Miller | a1738e4 | 2006-07-10 21:33:04 +1000 | [diff] [blame] | 66 | #include <grp.h> |
Damien Miller | 9f2abc4 | 2006-07-10 20:53:08 +1000 | [diff] [blame] | 67 | #include <pwd.h> |
Damien Miller | 6ff3cad | 2006-03-15 11:52:09 +1100 | [diff] [blame] | 68 | #include <signal.h> |
Damien Miller | ded319c | 2006-09-01 15:38:36 +1000 | [diff] [blame] | 69 | #include <stdarg.h> |
Damien Miller | a7a73ee | 2006-08-05 11:37:59 +1000 | [diff] [blame] | 70 | #include <stdio.h> |
Damien Miller | e7a1e5c | 2006-08-05 11:34:19 +1000 | [diff] [blame] | 71 | #include <stdlib.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 72 | #include <string.h> |
Damien Miller | 75bb664 | 2006-08-05 14:07:20 +1000 | [diff] [blame] | 73 | #include <unistd.h> |
deraadt@openbsd.org | 087266e | 2015-01-20 23:14:00 +0000 | [diff] [blame] | 74 | #include <limits.h> |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 75 | |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 76 | #ifdef WITH_OPENSSL |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 77 | #include <openssl/dh.h> |
| 78 | #include <openssl/bn.h> |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 79 | #include <openssl/rand.h> |
Darren Tucker | bfaaf96 | 2008-02-28 19:13:52 +1100 | [diff] [blame] | 80 | #include "openbsd-compat/openssl-compat.h" |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 81 | #endif |
Darren Tucker | bfaaf96 | 2008-02-28 19:13:52 +1100 | [diff] [blame] | 82 | |
Kevin Steves | 0ea1d9d | 2002-04-25 18:17:04 +0000 | [diff] [blame] | 83 | #ifdef HAVE_SECUREWARE |
| 84 | #include <sys/security.h> |
| 85 | #include <prot.h> |
| 86 | #endif |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 87 | |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 88 | #include "xmalloc.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 89 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 90 | #include "ssh2.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 91 | #include "rsa.h" |
Ben Lindstrom | d95c09c | 2001-02-18 19:13:33 +0000 | [diff] [blame] | 92 | #include "sshpty.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 93 | #include "packet.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 94 | #include "log.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 95 | #include "buffer.h" |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 96 | #include "misc.h" |
markus@openbsd.org | 3a1638d | 2015-07-10 06:21:53 +0000 | [diff] [blame] | 97 | #include "match.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 98 | #include "servconf.h" |
| 99 | #include "uidswap.h" |
| 100 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 101 | #include "cipher.h" |
Damien Miller | 4a1c7aa | 2014-02-04 11:03:36 +1100 | [diff] [blame] | 102 | #include "digest.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 103 | #include "key.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 104 | #include "kex.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 105 | #include "myproposal.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 106 | #include "authfile.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 107 | #include "pathnames.h" |
| 108 | #include "atomicio.h" |
| 109 | #include "canohost.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 110 | #include "hostfile.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 111 | #include "auth.h" |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 112 | #include "authfd.h" |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 113 | #include "msg.h" |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 114 | #include "dispatch.h" |
Ben Lindstrom | 1bae404 | 2001-10-03 17:46:39 +0000 | [diff] [blame] | 115 | #include "channels.h" |
Ben Lindstrom | 73ab9ba | 2002-03-22 01:27:35 +0000 | [diff] [blame] | 116 | #include "session.h" |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 117 | #include "monitor.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 118 | #ifdef GSSAPI |
| 119 | #include "ssh-gss.h" |
| 120 | #endif |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 121 | #include "monitor_wrap.h" |
Damien Miller | dcbd41e | 2011-06-23 19:45:51 +1000 | [diff] [blame] | 122 | #include "ssh-sandbox.h" |
Damien Miller | b757677 | 2006-07-10 20:23:39 +1000 | [diff] [blame] | 123 | #include "version.h" |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 124 | #include "ssherr.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 125 | |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 126 | /* Re-exec fds */ |
| 127 | #define REEXEC_DEVCRYPTO_RESERVED_FD (STDERR_FILENO + 1) |
| 128 | #define REEXEC_STARTUP_PIPE_FD (STDERR_FILENO + 2) |
| 129 | #define REEXEC_CONFIG_PASS_FD (STDERR_FILENO + 3) |
| 130 | #define REEXEC_MIN_FREE_FD (STDERR_FILENO + 4) |
| 131 | |
Ben Lindstrom | 49a79c0 | 2000-11-17 03:47:20 +0000 | [diff] [blame] | 132 | extern char *__progname; |
Ben Lindstrom | 49a79c0 | 2000-11-17 03:47:20 +0000 | [diff] [blame] | 133 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 134 | /* Server configuration options. */ |
| 135 | ServerOptions options; |
| 136 | |
| 137 | /* Name of the server configuration file. */ |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 138 | char *config_file_name = _PATH_SERVER_CONFIG_FILE; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 139 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 140 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 141 | * Debug mode flag. This can be set on the command line. If debug |
| 142 | * mode is enabled, extra debugging output will be sent to the system |
| 143 | * log, the daemon will not go to background, and will exit after processing |
| 144 | * the first connection. |
| 145 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 146 | int debug_flag = 0; |
| 147 | |
Ben Lindstrom | 794325a | 2001-08-06 21:09:07 +0000 | [diff] [blame] | 148 | /* Flag indicating that the daemon should only test the configuration and keys. */ |
| 149 | int test_flag = 0; |
| 150 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 151 | /* Flag indicating that the daemon is being started from inetd. */ |
| 152 | int inetd_flag = 0; |
| 153 | |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 154 | /* Flag indicating that sshd should not detach and become a daemon. */ |
| 155 | int no_daemon_flag = 0; |
| 156 | |
Damien Miller | 5ce662a | 1999-11-11 17:57:39 +1100 | [diff] [blame] | 157 | /* debug goes to stderr unless inetd_flag is set */ |
| 158 | int log_stderr = 0; |
| 159 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 160 | /* Saved arguments to main(). */ |
| 161 | char **saved_argv; |
Damien Miller | b8c656e | 2000-06-28 15:22:41 +1000 | [diff] [blame] | 162 | int saved_argc; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 163 | |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 164 | /* re-exec */ |
| 165 | int rexeced_flag = 0; |
| 166 | int rexec_flag = 1; |
| 167 | int rexec_argc = 0; |
| 168 | char **rexec_argv; |
| 169 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 170 | /* |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 171 | * The sockets that the server is listening; this is used in the SIGHUP |
| 172 | * signal handler. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 173 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 174 | #define MAX_LISTEN_SOCKS 16 |
| 175 | int listen_socks[MAX_LISTEN_SOCKS]; |
| 176 | int num_listen_socks = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 177 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 178 | /* |
| 179 | * the client's version string, passed by sshd2 in compat mode. if != NULL, |
| 180 | * sshd will skip the version-number exchange |
| 181 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 182 | char *client_version_string = NULL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 183 | char *server_version_string = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 184 | |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 185 | /* Daemon's agent connection */ |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 186 | int auth_sock = -1; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 187 | int have_agent = 0; |
| 188 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 189 | /* |
| 190 | * Any really sensitive data in the application is contained in this |
| 191 | * structure. The idea is that this structure could be locked into memory so |
| 192 | * that the pages do not get written into swap. However, there are some |
| 193 | * problems. The private key contains BIGNUMs, and we do not (in principle) |
| 194 | * have access to the internals of them, and locking just the structure is |
| 195 | * not very useful. Currently, memory locking is not implemented. |
| 196 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 197 | struct { |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame^] | 198 | struct sshkey **host_keys; /* all private host keys */ |
| 199 | struct sshkey **host_pubkeys; /* all public host keys */ |
| 200 | struct sshkey **host_certificates; /* all public host certificates */ |
| 201 | int have_ssh2_key; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 202 | } sensitive_data; |
| 203 | |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 204 | /* This is set to true when a signal is received. */ |
Ben Lindstrom | 5e71c54 | 2001-12-06 16:48:14 +0000 | [diff] [blame] | 205 | static volatile sig_atomic_t received_sighup = 0; |
| 206 | static volatile sig_atomic_t received_sigterm = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 207 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 208 | /* session identifier, used by RSA-auth */ |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 209 | u_char session_id[16]; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 210 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 211 | /* same for ssh2 */ |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 212 | u_char *session_id2 = NULL; |
Darren Tucker | 502d384 | 2003-06-28 12:38:01 +1000 | [diff] [blame] | 213 | u_int session_id2_len = 0; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 214 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 215 | /* record remote hostname or ip */ |
deraadt@openbsd.org | 087266e | 2015-01-20 23:14:00 +0000 | [diff] [blame] | 216 | u_int utmp_len = HOST_NAME_MAX+1; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 217 | |
Ben Lindstrom | d84df98 | 2001-12-06 16:35:40 +0000 | [diff] [blame] | 218 | /* options.max_startup sized array of fd ints */ |
| 219 | int *startup_pipes = NULL; |
| 220 | int startup_pipe; /* in child */ |
| 221 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 222 | /* variables used for privilege separation */ |
Darren Tucker | 4515047 | 2006-07-12 22:34:17 +1000 | [diff] [blame] | 223 | int use_privsep = -1; |
Darren Tucker | a8be9e2 | 2004-02-06 16:40:27 +1100 | [diff] [blame] | 224 | struct monitor *pmonitor = NULL; |
Damien Miller | 9ee2c60 | 2011-09-22 21:38:30 +1000 | [diff] [blame] | 225 | int privsep_is_preauth = 1; |
Darren Tucker | d13281f | 2017-03-29 12:39:39 +1100 | [diff] [blame] | 226 | static int privsep_chroot = 1; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 227 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 228 | /* global authentication context */ |
| 229 | Authctxt *the_authctxt = NULL; |
| 230 | |
Darren Tucker | 4515047 | 2006-07-12 22:34:17 +1000 | [diff] [blame] | 231 | /* sshd_config buffer */ |
| 232 | Buffer cfg; |
| 233 | |
Darren Tucker | 0999174 | 2004-07-17 17:05:14 +1000 | [diff] [blame] | 234 | /* message to be displayed after login */ |
| 235 | Buffer loginmsg; |
| 236 | |
Damien Miller | 6433df0 | 2006-09-07 10:36:43 +1000 | [diff] [blame] | 237 | /* Unprivileged user */ |
| 238 | struct passwd *privsep_pw = NULL; |
| 239 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 240 | /* Prototypes for various functions defined later in this file. */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 241 | void destroy_sensitive_data(void); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 242 | void demote_sensitive_data(void); |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 243 | static void do_ssh2_kex(void); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 244 | |
Damien Miller | 98c7ad6 | 2000-03-09 21:27:49 +1100 | [diff] [blame] | 245 | /* |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 246 | * Close all listening sockets |
| 247 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 248 | static void |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 249 | close_listen_socks(void) |
| 250 | { |
| 251 | int i; |
Ben Lindstrom | 822b634 | 2002-06-23 21:38:49 +0000 | [diff] [blame] | 252 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 253 | for (i = 0; i < num_listen_socks; i++) |
| 254 | close(listen_socks[i]); |
| 255 | num_listen_socks = -1; |
| 256 | } |
| 257 | |
Ben Lindstrom | d84df98 | 2001-12-06 16:35:40 +0000 | [diff] [blame] | 258 | static void |
| 259 | close_startup_pipes(void) |
| 260 | { |
| 261 | int i; |
Ben Lindstrom | 822b634 | 2002-06-23 21:38:49 +0000 | [diff] [blame] | 262 | |
Ben Lindstrom | d84df98 | 2001-12-06 16:35:40 +0000 | [diff] [blame] | 263 | if (startup_pipes) |
| 264 | for (i = 0; i < options.max_startups; i++) |
| 265 | if (startup_pipes[i] != -1) |
| 266 | close(startup_pipes[i]); |
| 267 | } |
| 268 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 269 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 270 | * Signal handler for SIGHUP. Sshd execs itself when it receives SIGHUP; |
| 271 | * the effect is to reread the configuration file (and to regenerate |
| 272 | * the server key). |
| 273 | */ |
Damien Miller | f0b15df | 2006-03-26 13:59:20 +1100 | [diff] [blame] | 274 | |
| 275 | /*ARGSUSED*/ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 276 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 277 | sighup_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 278 | { |
Ben Lindstrom | 0795848 | 2001-12-06 16:19:01 +0000 | [diff] [blame] | 279 | int save_errno = errno; |
| 280 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 281 | received_sighup = 1; |
| 282 | signal(SIGHUP, sighup_handler); |
Ben Lindstrom | 0795848 | 2001-12-06 16:19:01 +0000 | [diff] [blame] | 283 | errno = save_errno; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 284 | } |
| 285 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 286 | /* |
| 287 | * Called from the main program after receiving SIGHUP. |
| 288 | * Restarts the server. |
| 289 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 290 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 291 | sighup_restart(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 292 | { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 293 | logit("Received SIGHUP; restarting."); |
dtucker@openbsd.org | f2398eb | 2016-12-04 22:27:25 +0000 | [diff] [blame] | 294 | if (options.pid_file != NULL) |
| 295 | unlink(options.pid_file); |
Darren Tucker | f2bf36c | 2013-09-22 19:02:40 +1000 | [diff] [blame] | 296 | platform_pre_restart(); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 297 | close_listen_socks(); |
Ben Lindstrom | d84df98 | 2001-12-06 16:35:40 +0000 | [diff] [blame] | 298 | close_startup_pipes(); |
Darren Tucker | ed62396 | 2007-02-25 20:37:21 +1100 | [diff] [blame] | 299 | alarm(0); /* alarm timer persists across exec */ |
Darren Tucker | 2c671bf | 2010-01-09 22:28:43 +1100 | [diff] [blame] | 300 | signal(SIGHUP, SIG_IGN); /* will be restored after exec */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 301 | execv(saved_argv[0], saved_argv); |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 302 | logit("RESTART FAILED: av[0]='%.100s', error: %.100s.", saved_argv[0], |
Ben Lindstrom | 822b634 | 2002-06-23 21:38:49 +0000 | [diff] [blame] | 303 | strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 304 | exit(1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 305 | } |
| 306 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 307 | /* |
| 308 | * Generic signal handler for terminating signals in the master daemon. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 309 | */ |
Damien Miller | f0b15df | 2006-03-26 13:59:20 +1100 | [diff] [blame] | 310 | /*ARGSUSED*/ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 311 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 312 | sigterm_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 313 | { |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 314 | received_sigterm = sig; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 315 | } |
| 316 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 317 | /* |
| 318 | * SIGCHLD handler. This is called whenever a child dies. This will then |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 319 | * reap any zombies left by exited children. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 320 | */ |
Damien Miller | f0b15df | 2006-03-26 13:59:20 +1100 | [diff] [blame] | 321 | /*ARGSUSED*/ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 322 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 323 | main_sigchld_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 324 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 325 | int save_errno = errno; |
Ben Lindstrom | 822b634 | 2002-06-23 21:38:49 +0000 | [diff] [blame] | 326 | pid_t pid; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 327 | int status; |
Damien Miller | 431f66b | 1999-11-21 18:31:57 +1100 | [diff] [blame] | 328 | |
Ben Lindstrom | 47fd811 | 2002-04-02 20:48:19 +0000 | [diff] [blame] | 329 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || |
| 330 | (pid < 0 && errno == EINTR)) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 331 | ; |
Damien Miller | 431f66b | 1999-11-21 18:31:57 +1100 | [diff] [blame] | 332 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 333 | signal(SIGCHLD, main_sigchld_handler); |
| 334 | errno = save_errno; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 335 | } |
| 336 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 337 | /* |
| 338 | * Signal handler for the alarm after the login grace period has expired. |
| 339 | */ |
Damien Miller | f0b15df | 2006-03-26 13:59:20 +1100 | [diff] [blame] | 340 | /*ARGSUSED*/ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 341 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 342 | grace_alarm_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 343 | { |
Darren Tucker | a8be9e2 | 2004-02-06 16:40:27 +1100 | [diff] [blame] | 344 | if (use_privsep && pmonitor != NULL && pmonitor->m_pid > 0) |
| 345 | kill(pmonitor->m_pid, SIGALRM); |
| 346 | |
Damien Miller | 09d3e12 | 2012-10-31 08:58:58 +1100 | [diff] [blame] | 347 | /* |
| 348 | * Try to kill any processes that we have spawned, E.g. authorized |
| 349 | * keys command helpers. |
| 350 | */ |
| 351 | if (getpgid(0) == getpid()) { |
| 352 | signal(SIGTERM, SIG_IGN); |
Damien Miller | ab16ef4 | 2014-01-28 15:08:12 +1100 | [diff] [blame] | 353 | kill(0, SIGTERM); |
Damien Miller | 09d3e12 | 2012-10-31 08:58:58 +1100 | [diff] [blame] | 354 | } |
| 355 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 356 | /* Log error and exit. */ |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 357 | sigdie("Timeout before authentication for %s port %d", |
| 358 | ssh_remote_ipaddr(active_state), ssh_remote_port(active_state)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 359 | } |
| 360 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 361 | static void |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 362 | sshd_exchange_identification(struct ssh *ssh, int sock_in, int sock_out) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 363 | { |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 364 | u_int i; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 365 | int remote_major, remote_minor; |
djm@openbsd.org | 5b90709 | 2017-02-06 09:22:51 +0000 | [diff] [blame] | 366 | char *s; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 367 | char buf[256]; /* Must not be larger than remote_version. */ |
| 368 | char remote_version[256]; /* Must be at least as big as buf. */ |
| 369 | |
djm@openbsd.org | 5b90709 | 2017-02-06 09:22:51 +0000 | [diff] [blame] | 370 | xasprintf(&server_version_string, "SSH-%d.%d-%.100s%s%s\r\n", |
naddy@openbsd.org | c38ea63 | 2016-08-15 12:27:56 +0000 | [diff] [blame] | 371 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, SSH_VERSION, |
Damien Miller | 2352881 | 2012-04-22 11:24:43 +1000 | [diff] [blame] | 372 | *options.version_addendum == '\0' ? "" : " ", |
djm@openbsd.org | 5b90709 | 2017-02-06 09:22:51 +0000 | [diff] [blame] | 373 | options.version_addendum); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 374 | |
Darren Tucker | fe0078a | 2003-07-19 19:52:28 +1000 | [diff] [blame] | 375 | /* Send our protocol version identification. */ |
markus@openbsd.org | a306863 | 2016-01-14 16:17:39 +0000 | [diff] [blame] | 376 | if (atomicio(vwrite, sock_out, server_version_string, |
Darren Tucker | fe0078a | 2003-07-19 19:52:28 +1000 | [diff] [blame] | 377 | strlen(server_version_string)) |
| 378 | != strlen(server_version_string)) { |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 379 | logit("Could not write ident string to %s port %d", |
| 380 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 381 | cleanup_exit(255); |
Darren Tucker | fe0078a | 2003-07-19 19:52:28 +1000 | [diff] [blame] | 382 | } |
| 383 | |
| 384 | /* Read other sides version identification. */ |
| 385 | memset(buf, 0, sizeof(buf)); |
| 386 | for (i = 0; i < sizeof(buf) - 1; i++) { |
markus@openbsd.org | a306863 | 2016-01-14 16:17:39 +0000 | [diff] [blame] | 387 | if (atomicio(read, sock_in, &buf[i], 1) != 1) { |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 388 | logit("Did not receive identification string " |
| 389 | "from %s port %d", |
| 390 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 391 | cleanup_exit(255); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 392 | } |
Darren Tucker | fe0078a | 2003-07-19 19:52:28 +1000 | [diff] [blame] | 393 | if (buf[i] == '\r') { |
| 394 | buf[i] = 0; |
| 395 | /* Kludge for F-Secure Macintosh < 1.0.2 */ |
| 396 | if (i == 12 && |
| 397 | strncmp(buf, "SSH-1.5-W1.0", 12) == 0) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 398 | break; |
Darren Tucker | fe0078a | 2003-07-19 19:52:28 +1000 | [diff] [blame] | 399 | continue; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 400 | } |
Darren Tucker | fe0078a | 2003-07-19 19:52:28 +1000 | [diff] [blame] | 401 | if (buf[i] == '\n') { |
| 402 | buf[i] = 0; |
| 403 | break; |
| 404 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 405 | } |
Darren Tucker | fe0078a | 2003-07-19 19:52:28 +1000 | [diff] [blame] | 406 | buf[sizeof(buf) - 1] = 0; |
| 407 | client_version_string = xstrdup(buf); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 408 | |
| 409 | /* |
| 410 | * Check that the versions match. In future this might accept |
| 411 | * several versions and set appropriate flags to handle them. |
| 412 | */ |
| 413 | if (sscanf(client_version_string, "SSH-%d.%d-%[^\n]\n", |
| 414 | &remote_major, &remote_minor, remote_version) != 3) { |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 415 | s = "Protocol mismatch.\n"; |
Darren Tucker | 9f63f22 | 2003-07-03 13:46:56 +1000 | [diff] [blame] | 416 | (void) atomicio(vwrite, sock_out, s, strlen(s)); |
Damien Miller | 4502f88 | 2013-10-18 10:17:36 +1100 | [diff] [blame] | 417 | logit("Bad protocol version identification '%.100s' " |
| 418 | "from %s port %d", client_version_string, |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 419 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh)); |
Damien Miller | 23e00aa | 2013-11-21 13:56:28 +1100 | [diff] [blame] | 420 | close(sock_in); |
| 421 | close(sock_out); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 422 | cleanup_exit(255); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 423 | } |
| 424 | debug("Client protocol version %d.%d; client software version %.100s", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 425 | remote_major, remote_minor, remote_version); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 426 | |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 427 | ssh->compat = compat_datafellows(remote_version); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 428 | |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 429 | if ((ssh->compat & SSH_BUG_PROBE) != 0) { |
| 430 | logit("probed from %s port %d with %s. Don't panic.", |
| 431 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), |
| 432 | client_version_string); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 433 | cleanup_exit(255); |
Damien Miller | e926497 | 2002-09-30 11:59:21 +1000 | [diff] [blame] | 434 | } |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 435 | if ((ssh->compat & SSH_BUG_SCANNER) != 0) { |
| 436 | logit("scanned from %s port %d with %s. Don't panic.", |
| 437 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), |
| 438 | client_version_string); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 439 | cleanup_exit(255); |
Damien Miller | 27dbe6f | 2001-03-19 22:36:20 +1100 | [diff] [blame] | 440 | } |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 441 | if ((ssh->compat & SSH_BUG_RSASIGMD5) != 0) { |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 442 | logit("Client version \"%.100s\" uses unsafe RSA signature " |
| 443 | "scheme; disabling use of RSA keys", remote_version); |
Damien Miller | 58cd63b | 2014-01-10 10:59:24 +1100 | [diff] [blame] | 444 | } |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 445 | if ((ssh->compat & SSH_BUG_DERIVEKEY) != 0) { |
Damien Miller | 58cd63b | 2014-01-10 10:59:24 +1100 | [diff] [blame] | 446 | fatal("Client version \"%.100s\" uses unsafe key agreement; " |
| 447 | "refusing connection", remote_version); |
| 448 | } |
Damien Miller | 27dbe6f | 2001-03-19 22:36:20 +1100 | [diff] [blame] | 449 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 450 | chop(server_version_string); |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 451 | debug("Local version string %.200s", server_version_string); |
| 452 | |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame] | 453 | if (remote_major != 2 || |
| 454 | (remote_major == 1 && remote_minor != 99)) { |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 455 | s = "Protocol major versions differ.\n"; |
Darren Tucker | 9f63f22 | 2003-07-03 13:46:56 +1000 | [diff] [blame] | 456 | (void) atomicio(vwrite, sock_out, s, strlen(s)); |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 457 | close(sock_in); |
| 458 | close(sock_out); |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 459 | logit("Protocol major versions differ for %s port %d: " |
| 460 | "%.200s vs. %.200s", |
| 461 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 462 | server_version_string, client_version_string); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 463 | cleanup_exit(255); |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 464 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 465 | } |
| 466 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 467 | /* Destroy the host and server keys. They will no longer be needed. */ |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 468 | void |
| 469 | destroy_sensitive_data(void) |
| 470 | { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 471 | int i; |
| 472 | |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 473 | for (i = 0; i < options.num_host_key_files; i++) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 474 | if (sensitive_data.host_keys[i]) { |
| 475 | key_free(sensitive_data.host_keys[i]); |
| 476 | sensitive_data.host_keys[i] = NULL; |
| 477 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 478 | if (sensitive_data.host_certificates[i]) { |
| 479 | key_free(sensitive_data.host_certificates[i]); |
| 480 | sensitive_data.host_certificates[i] = NULL; |
| 481 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 482 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 483 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 484 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 485 | /* Demote private to public keys for network child */ |
| 486 | void |
| 487 | demote_sensitive_data(void) |
| 488 | { |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame^] | 489 | struct sshkey *tmp; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 490 | int i; |
| 491 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 492 | for (i = 0; i < options.num_host_key_files; i++) { |
| 493 | if (sensitive_data.host_keys[i]) { |
| 494 | tmp = key_demote(sensitive_data.host_keys[i]); |
| 495 | key_free(sensitive_data.host_keys[i]); |
| 496 | sensitive_data.host_keys[i] = tmp; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 497 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 498 | /* Certs do not need demotion */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 499 | } |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 500 | } |
| 501 | |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 502 | static void |
Damien Miller | c9f880c | 2016-11-30 13:51:49 +1100 | [diff] [blame] | 503 | reseed_prngs(void) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 504 | { |
Darren Tucker | 64cee36 | 2009-06-21 20:26:17 +1000 | [diff] [blame] | 505 | u_int32_t rnd[256]; |
Damien Miller | c9f880c | 2016-11-30 13:51:49 +1100 | [diff] [blame] | 506 | |
| 507 | #ifdef WITH_OPENSSL |
| 508 | RAND_poll(); |
| 509 | #endif |
| 510 | arc4random_stir(); /* noop on recent arc4random() implementations */ |
| 511 | arc4random_buf(rnd, sizeof(rnd)); /* let arc4random notice PID change */ |
| 512 | |
| 513 | #ifdef WITH_OPENSSL |
| 514 | RAND_seed(rnd, sizeof(rnd)); |
| 515 | /* give libcrypto a chance to notice the PID change */ |
| 516 | if ((RAND_bytes((u_char *)rnd, 1)) != 1) |
| 517 | fatal("%s: RAND_bytes failed", __func__); |
| 518 | #endif |
| 519 | |
| 520 | explicit_bzero(rnd, sizeof(rnd)); |
| 521 | } |
| 522 | |
| 523 | static void |
| 524 | privsep_preauth_child(void) |
| 525 | { |
Ben Lindstrom | 810af96 | 2002-07-04 00:11:40 +0000 | [diff] [blame] | 526 | gid_t gidset[1]; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 527 | |
| 528 | /* Enable challenge-response authentication for privilege separation */ |
| 529 | privsep_challenge_enable(); |
| 530 | |
Damien Miller | fb3423b | 2014-02-27 10:20:07 +1100 | [diff] [blame] | 531 | #ifdef GSSAPI |
Damien Miller | e6a74ae | 2014-02-27 10:17:49 +1100 | [diff] [blame] | 532 | /* Cache supported mechanism OIDs for later use */ |
| 533 | if (options.gss_authentication) |
| 534 | ssh_gssapi_prepare_supported_oids(); |
Damien Miller | fb3423b | 2014-02-27 10:20:07 +1100 | [diff] [blame] | 535 | #endif |
Damien Miller | e6a74ae | 2014-02-27 10:17:49 +1100 | [diff] [blame] | 536 | |
Damien Miller | c9f880c | 2016-11-30 13:51:49 +1100 | [diff] [blame] | 537 | reseed_prngs(); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 538 | |
| 539 | /* Demote the private keys to public keys. */ |
| 540 | demote_sensitive_data(); |
| 541 | |
djm@openbsd.org | 5b4010d | 2015-11-16 22:51:05 +0000 | [diff] [blame] | 542 | /* Demote the child */ |
Darren Tucker | d13281f | 2017-03-29 12:39:39 +1100 | [diff] [blame] | 543 | if (privsep_chroot) { |
djm@openbsd.org | 5b4010d | 2015-11-16 22:51:05 +0000 | [diff] [blame] | 544 | /* Change our root directory */ |
| 545 | if (chroot(_PATH_PRIVSEP_CHROOT_DIR) == -1) |
| 546 | fatal("chroot(\"%s\"): %s", _PATH_PRIVSEP_CHROOT_DIR, |
| 547 | strerror(errno)); |
| 548 | if (chdir("/") == -1) |
| 549 | fatal("chdir(\"/\"): %s", strerror(errno)); |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 550 | |
djm@openbsd.org | 5b4010d | 2015-11-16 22:51:05 +0000 | [diff] [blame] | 551 | /* Drop our privileges */ |
| 552 | debug3("privsep user:group %u:%u", (u_int)privsep_pw->pw_uid, |
| 553 | (u_int)privsep_pw->pw_gid); |
| 554 | gidset[0] = privsep_pw->pw_gid; |
| 555 | if (setgroups(1, gidset) < 0) |
| 556 | fatal("setgroups: %.100s", strerror(errno)); |
| 557 | permanently_set_uid(privsep_pw); |
| 558 | } |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 559 | } |
| 560 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 561 | static int |
| 562 | privsep_preauth(Authctxt *authctxt) |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 563 | { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 564 | int status, r; |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 565 | pid_t pid; |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 566 | struct ssh_sandbox *box = NULL; |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 567 | |
| 568 | /* Set up unprivileged child process to deal with network data */ |
Ben Lindstrom | 7339b2a | 2002-05-15 16:25:01 +0000 | [diff] [blame] | 569 | pmonitor = monitor_init(); |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 570 | /* Store a pointer to the kex for later rekeying */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 571 | pmonitor->m_pkex = &active_state->kex; |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 572 | |
Damien Miller | 5a5c2b9 | 2012-07-31 12:21:34 +1000 | [diff] [blame] | 573 | if (use_privsep == PRIVSEP_ON) |
Damien Miller | 868ea1e | 2014-01-17 16:47:04 +1100 | [diff] [blame] | 574 | box = ssh_sandbox_init(pmonitor); |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 575 | pid = fork(); |
| 576 | if (pid == -1) { |
| 577 | fatal("fork of unprivileged child failed"); |
| 578 | } else if (pid != 0) { |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 579 | debug2("Network child is on pid %ld", (long)pid); |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 580 | |
Darren Tucker | 3b4b2d3 | 2012-07-02 18:54:31 +1000 | [diff] [blame] | 581 | pmonitor->m_pid = pid; |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 582 | if (have_agent) { |
| 583 | r = ssh_get_authentication_socket(&auth_sock); |
| 584 | if (r != 0) { |
| 585 | error("Could not get agent socket: %s", |
| 586 | ssh_err(r)); |
| 587 | have_agent = 0; |
| 588 | } |
| 589 | } |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 590 | if (box != NULL) |
| 591 | ssh_sandbox_parent_preauth(box, pid); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 592 | monitor_child_preauth(authctxt, pmonitor); |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 593 | |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 594 | /* Wait for the child's exit status */ |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 595 | while (waitpid(pid, &status, 0) < 0) { |
Damien Miller | 9ee2c60 | 2011-09-22 21:38:30 +1000 | [diff] [blame] | 596 | if (errno == EINTR) |
| 597 | continue; |
| 598 | pmonitor->m_pid = -1; |
| 599 | fatal("%s: waitpid: %s", __func__, strerror(errno)); |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 600 | } |
Damien Miller | 9ee2c60 | 2011-09-22 21:38:30 +1000 | [diff] [blame] | 601 | privsep_is_preauth = 0; |
| 602 | pmonitor->m_pid = -1; |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 603 | if (WIFEXITED(status)) { |
| 604 | if (WEXITSTATUS(status) != 0) |
| 605 | fatal("%s: preauth child exited with status %d", |
| 606 | __func__, WEXITSTATUS(status)); |
| 607 | } else if (WIFSIGNALED(status)) |
| 608 | fatal("%s: preauth child terminated by signal %d", |
| 609 | __func__, WTERMSIG(status)); |
| 610 | if (box != NULL) |
| 611 | ssh_sandbox_parent_finish(box); |
| 612 | return 1; |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 613 | } else { |
| 614 | /* child */ |
Ben Lindstrom | 7339b2a | 2002-05-15 16:25:01 +0000 | [diff] [blame] | 615 | close(pmonitor->m_sendfd); |
Damien Miller | 8f0bf23 | 2011-06-20 14:42:23 +1000 | [diff] [blame] | 616 | close(pmonitor->m_log_recvfd); |
| 617 | |
| 618 | /* Arrange for logging to be sent to the monitor */ |
| 619 | set_log_handler(mm_log_handler, pmonitor); |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 620 | |
djm@openbsd.org | 5b4010d | 2015-11-16 22:51:05 +0000 | [diff] [blame] | 621 | privsep_preauth_child(); |
Ben Lindstrom | f90f58d | 2002-03-26 01:53:03 +0000 | [diff] [blame] | 622 | setproctitle("%s", "[net]"); |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 623 | if (box != NULL) |
| 624 | ssh_sandbox_child(box); |
| 625 | |
| 626 | return 0; |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 627 | } |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 628 | } |
| 629 | |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 630 | static void |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 631 | privsep_postauth(Authctxt *authctxt) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 632 | { |
Tim Rice | 9dd3081 | 2002-07-07 13:43:36 -0700 | [diff] [blame] | 633 | #ifdef DISABLE_FD_PASSING |
Tim Rice | 8eff319 | 2002-06-25 15:35:15 -0700 | [diff] [blame] | 634 | if (1) { |
| 635 | #else |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 636 | if (authctxt->pw->pw_uid == 0) { |
Tim Rice | 8eff319 | 2002-06-25 15:35:15 -0700 | [diff] [blame] | 637 | #endif |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 638 | /* File descriptor passing is broken or root login */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 639 | use_privsep = 0; |
Darren Tucker | 45b0142 | 2005-10-03 18:20:00 +1000 | [diff] [blame] | 640 | goto skip; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 641 | } |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 642 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 643 | /* New socket pair */ |
Ben Lindstrom | 7339b2a | 2002-05-15 16:25:01 +0000 | [diff] [blame] | 644 | monitor_reinit(pmonitor); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 645 | |
Ben Lindstrom | 7339b2a | 2002-05-15 16:25:01 +0000 | [diff] [blame] | 646 | pmonitor->m_pid = fork(); |
| 647 | if (pmonitor->m_pid == -1) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 648 | fatal("fork of unprivileged child failed"); |
Ben Lindstrom | 7339b2a | 2002-05-15 16:25:01 +0000 | [diff] [blame] | 649 | else if (pmonitor->m_pid != 0) { |
Damien Miller | b61f3fc | 2008-07-11 17:36:48 +1000 | [diff] [blame] | 650 | verbose("User child is on pid %ld", (long)pmonitor->m_pid); |
Darren Tucker | eb57862 | 2004-08-12 23:08:14 +1000 | [diff] [blame] | 651 | buffer_clear(&loginmsg); |
Ben Lindstrom | 7339b2a | 2002-05-15 16:25:01 +0000 | [diff] [blame] | 652 | monitor_child_postauth(pmonitor); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 653 | |
| 654 | /* NEVERREACHED */ |
| 655 | exit(0); |
| 656 | } |
| 657 | |
Damien Miller | 8f0bf23 | 2011-06-20 14:42:23 +1000 | [diff] [blame] | 658 | /* child */ |
| 659 | |
Ben Lindstrom | 7339b2a | 2002-05-15 16:25:01 +0000 | [diff] [blame] | 660 | close(pmonitor->m_sendfd); |
Damien Miller | 8f0bf23 | 2011-06-20 14:42:23 +1000 | [diff] [blame] | 661 | pmonitor->m_sendfd = -1; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 662 | |
| 663 | /* Demote the private keys to public keys. */ |
| 664 | demote_sensitive_data(); |
| 665 | |
Damien Miller | c9f880c | 2016-11-30 13:51:49 +1100 | [diff] [blame] | 666 | reseed_prngs(); |
Damien Miller | 76e95da | 2008-03-07 18:31:24 +1100 | [diff] [blame] | 667 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 668 | /* Drop privileges */ |
| 669 | do_setusercontext(authctxt->pw); |
| 670 | |
Darren Tucker | 45b0142 | 2005-10-03 18:20:00 +1000 | [diff] [blame] | 671 | skip: |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 672 | /* It is safe now to apply the key state */ |
Ben Lindstrom | 7339b2a | 2002-05-15 16:25:01 +0000 | [diff] [blame] | 673 | monitor_apply_keystate(pmonitor); |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 674 | |
| 675 | /* |
| 676 | * Tell the packet layer that authentication was successful, since |
| 677 | * this information is not part of the key state. |
| 678 | */ |
| 679 | packet_set_authenticated(); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 680 | } |
| 681 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 682 | static char * |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 683 | list_hostkey_types(void) |
| 684 | { |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 685 | Buffer b; |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 686 | const char *p; |
| 687 | char *ret; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 688 | int i; |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame^] | 689 | struct sshkey *key; |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 690 | |
| 691 | buffer_init(&b); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 692 | for (i = 0; i < options.num_host_key_files; i++) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 693 | key = sensitive_data.host_keys[i]; |
djm@openbsd.org | ce63c4b | 2015-02-16 22:30:03 +0000 | [diff] [blame] | 694 | if (key == NULL) |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 695 | key = sensitive_data.host_pubkeys[i]; |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 696 | if (key == NULL) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 697 | continue; |
markus@openbsd.org | 3a1638d | 2015-07-10 06:21:53 +0000 | [diff] [blame] | 698 | /* Check that the key is accepted in HostkeyAlgorithms */ |
| 699 | if (match_pattern_list(sshkey_ssh_name(key), |
| 700 | options.hostkeyalgorithms, 0) != 1) { |
| 701 | debug3("%s: %s key not permitted by HostkeyAlgorithms", |
| 702 | __func__, sshkey_ssh_name(key)); |
| 703 | continue; |
| 704 | } |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 705 | switch (key->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 706 | case KEY_RSA: |
| 707 | case KEY_DSA: |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 708 | case KEY_ECDSA: |
Damien Miller | 5be9d9e | 2013-12-07 11:24:01 +1100 | [diff] [blame] | 709 | case KEY_ED25519: |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 710 | if (buffer_len(&b) > 0) |
| 711 | buffer_append(&b, ",", 1); |
| 712 | p = key_ssh_name(key); |
| 713 | buffer_append(&b, p, strlen(p)); |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 714 | |
| 715 | /* for RSA we also support SHA2 signatures */ |
| 716 | if (key->type == KEY_RSA) { |
| 717 | p = ",rsa-sha2-512,rsa-sha2-256"; |
| 718 | buffer_append(&b, p, strlen(p)); |
| 719 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 720 | break; |
| 721 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 722 | /* If the private key has a cert peer, then list that too */ |
| 723 | key = sensitive_data.host_certificates[i]; |
| 724 | if (key == NULL) |
| 725 | continue; |
| 726 | switch (key->type) { |
| 727 | case KEY_RSA_CERT: |
| 728 | case KEY_DSA_CERT: |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 729 | case KEY_ECDSA_CERT: |
Damien Miller | 5be9d9e | 2013-12-07 11:24:01 +1100 | [diff] [blame] | 730 | case KEY_ED25519_CERT: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 731 | if (buffer_len(&b) > 0) |
| 732 | buffer_append(&b, ",", 1); |
| 733 | p = key_ssh_name(key); |
| 734 | buffer_append(&b, p, strlen(p)); |
| 735 | break; |
| 736 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 737 | } |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 738 | if ((ret = sshbuf_dup_string(&b)) == NULL) |
| 739 | fatal("%s: sshbuf_dup_string failed", __func__); |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 740 | buffer_free(&b); |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 741 | debug("list_hostkey_types: %s", ret); |
| 742 | return ret; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 743 | } |
| 744 | |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame^] | 745 | static struct sshkey * |
djm@openbsd.org | 5104db7 | 2015-01-26 06:10:03 +0000 | [diff] [blame] | 746 | get_hostkey_by_type(int type, int nid, int need_private, struct ssh *ssh) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 747 | { |
| 748 | int i; |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame^] | 749 | struct sshkey *key; |
Ben Lindstrom | 822b634 | 2002-06-23 21:38:49 +0000 | [diff] [blame] | 750 | |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 751 | for (i = 0; i < options.num_host_key_files; i++) { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 752 | switch (type) { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 753 | case KEY_RSA_CERT: |
| 754 | case KEY_DSA_CERT: |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 755 | case KEY_ECDSA_CERT: |
Damien Miller | 5be9d9e | 2013-12-07 11:24:01 +1100 | [diff] [blame] | 756 | case KEY_ED25519_CERT: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 757 | key = sensitive_data.host_certificates[i]; |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 758 | break; |
| 759 | default: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 760 | key = sensitive_data.host_keys[i]; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 761 | if (key == NULL && !need_private) |
| 762 | key = sensitive_data.host_pubkeys[i]; |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 763 | break; |
| 764 | } |
djm@openbsd.org | 5104db7 | 2015-01-26 06:10:03 +0000 | [diff] [blame] | 765 | if (key != NULL && key->type == type && |
| 766 | (key->type != KEY_ECDSA || key->ecdsa_nid == nid)) |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 767 | return need_private ? |
| 768 | sensitive_data.host_keys[i] : key; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 769 | } |
| 770 | return NULL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 771 | } |
| 772 | |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame^] | 773 | struct sshkey * |
djm@openbsd.org | 5104db7 | 2015-01-26 06:10:03 +0000 | [diff] [blame] | 774 | get_hostkey_public_by_type(int type, int nid, struct ssh *ssh) |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 775 | { |
djm@openbsd.org | 5104db7 | 2015-01-26 06:10:03 +0000 | [diff] [blame] | 776 | return get_hostkey_by_type(type, nid, 0, ssh); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 777 | } |
| 778 | |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame^] | 779 | struct sshkey * |
djm@openbsd.org | 5104db7 | 2015-01-26 06:10:03 +0000 | [diff] [blame] | 780 | get_hostkey_private_by_type(int type, int nid, struct ssh *ssh) |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 781 | { |
djm@openbsd.org | 5104db7 | 2015-01-26 06:10:03 +0000 | [diff] [blame] | 782 | return get_hostkey_by_type(type, nid, 1, ssh); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 783 | } |
| 784 | |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame^] | 785 | struct sshkey * |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 786 | get_hostkey_by_index(int ind) |
| 787 | { |
| 788 | if (ind < 0 || ind >= options.num_host_key_files) |
| 789 | return (NULL); |
| 790 | return (sensitive_data.host_keys[ind]); |
| 791 | } |
| 792 | |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame^] | 793 | struct sshkey * |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 794 | get_hostkey_public_by_index(int ind, struct ssh *ssh) |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 795 | { |
| 796 | if (ind < 0 || ind >= options.num_host_key_files) |
| 797 | return (NULL); |
| 798 | return (sensitive_data.host_pubkeys[ind]); |
| 799 | } |
| 800 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 801 | int |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame^] | 802 | get_hostkey_index(struct sshkey *key, int compare, struct ssh *ssh) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 803 | { |
| 804 | int i; |
Ben Lindstrom | 822b634 | 2002-06-23 21:38:49 +0000 | [diff] [blame] | 805 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 806 | for (i = 0; i < options.num_host_key_files; i++) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 807 | if (key_is_cert(key)) { |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 808 | if (key == sensitive_data.host_certificates[i] || |
| 809 | (compare && sensitive_data.host_certificates[i] && |
| 810 | sshkey_equal(key, |
| 811 | sensitive_data.host_certificates[i]))) |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 812 | return (i); |
| 813 | } else { |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 814 | if (key == sensitive_data.host_keys[i] || |
| 815 | (compare && sensitive_data.host_keys[i] && |
| 816 | sshkey_equal(key, sensitive_data.host_keys[i]))) |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 817 | return (i); |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 818 | if (key == sensitive_data.host_pubkeys[i] || |
| 819 | (compare && sensitive_data.host_pubkeys[i] && |
| 820 | sshkey_equal(key, sensitive_data.host_pubkeys[i]))) |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 821 | return (i); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 822 | } |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 823 | } |
| 824 | return (-1); |
| 825 | } |
| 826 | |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 827 | /* Inform the client of all hostkeys */ |
| 828 | static void |
| 829 | notify_hostkeys(struct ssh *ssh) |
| 830 | { |
| 831 | struct sshbuf *buf; |
| 832 | struct sshkey *key; |
| 833 | int i, nkeys, r; |
| 834 | char *fp; |
| 835 | |
dtucker@openbsd.org | d8f391c | 2015-04-10 05:16:50 +0000 | [diff] [blame] | 836 | /* Some clients cannot cope with the hostkeys message, skip those. */ |
| 837 | if (datafellows & SSH_BUG_HOSTKEYS) |
| 838 | return; |
| 839 | |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 840 | if ((buf = sshbuf_new()) == NULL) |
| 841 | fatal("%s: sshbuf_new", __func__); |
| 842 | for (i = nkeys = 0; i < options.num_host_key_files; i++) { |
| 843 | key = get_hostkey_public_by_index(i, ssh); |
| 844 | if (key == NULL || key->type == KEY_UNSPEC || |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 845 | sshkey_is_cert(key)) |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 846 | continue; |
| 847 | fp = sshkey_fingerprint(key, options.fingerprint_hash, |
| 848 | SSH_FP_DEFAULT); |
| 849 | debug3("%s: key %d: %s %s", __func__, i, |
| 850 | sshkey_ssh_name(key), fp); |
| 851 | free(fp); |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 852 | if (nkeys == 0) { |
| 853 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
djm@openbsd.org | 44732de | 2015-02-20 22:17:21 +0000 | [diff] [blame] | 854 | packet_put_cstring("hostkeys-00@openssh.com"); |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 855 | packet_put_char(0); /* want-reply */ |
| 856 | } |
| 857 | sshbuf_reset(buf); |
| 858 | if ((r = sshkey_putb(key, buf)) != 0) |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 859 | fatal("%s: couldn't put hostkey %d: %s", |
| 860 | __func__, i, ssh_err(r)); |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 861 | packet_put_string(sshbuf_ptr(buf), sshbuf_len(buf)); |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 862 | nkeys++; |
| 863 | } |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 864 | debug3("%s: sent %d hostkeys", __func__, nkeys); |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 865 | if (nkeys == 0) |
| 866 | fatal("%s: no hostkeys", __func__); |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 867 | packet_send(); |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 868 | sshbuf_free(buf); |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 869 | } |
| 870 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 871 | /* |
| 872 | * returns 1 if connection should be dropped, 0 otherwise. |
| 873 | * dropping starts at connection #max_startups_begin with a probability |
| 874 | * of (max_startups_rate/100). the probability increases linearly until |
| 875 | * all connections are dropped for startups > max_startups |
| 876 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 877 | static int |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 878 | drop_connection(int startups) |
| 879 | { |
Darren Tucker | 178fa66 | 2004-11-05 20:09:09 +1100 | [diff] [blame] | 880 | int p, r; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 881 | |
| 882 | if (startups < options.max_startups_begin) |
| 883 | return 0; |
| 884 | if (startups >= options.max_startups) |
| 885 | return 1; |
| 886 | if (options.max_startups_rate == 100) |
| 887 | return 1; |
| 888 | |
| 889 | p = 100 - options.max_startups_rate; |
| 890 | p *= startups - options.max_startups_begin; |
Darren Tucker | 178fa66 | 2004-11-05 20:09:09 +1100 | [diff] [blame] | 891 | p /= options.max_startups - options.max_startups_begin; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 892 | p += options.max_startups_rate; |
Damien Miller | 354c48c | 2008-05-19 14:50:00 +1000 | [diff] [blame] | 893 | r = arc4random_uniform(100); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 894 | |
Darren Tucker | 3269b13 | 2004-11-05 20:20:59 +1100 | [diff] [blame] | 895 | debug("drop_connection: p %d, r %d", p, r); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 896 | return (r < p) ? 1 : 0; |
| 897 | } |
| 898 | |
Ben Lindstrom | ade03f6 | 2001-12-06 18:22:17 +0000 | [diff] [blame] | 899 | static void |
| 900 | usage(void) |
| 901 | { |
Damien Miller | 0c889cd | 2004-03-22 09:36:00 +1100 | [diff] [blame] | 902 | fprintf(stderr, "%s, %s\n", |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 903 | SSH_RELEASE, |
| 904 | #ifdef WITH_OPENSSL |
| 905 | SSLeay_version(SSLEAY_VERSION) |
| 906 | #else |
| 907 | "without OpenSSL" |
| 908 | #endif |
| 909 | ); |
Damien Miller | b408786 | 2004-03-22 09:35:21 +1100 | [diff] [blame] | 910 | fprintf(stderr, |
naddy@openbsd.org | c38ea63 | 2016-08-15 12:27:56 +0000 | [diff] [blame] | 911 | "usage: sshd [-46DdeiqTt] [-C connection_spec] [-c host_cert_file]\n" |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 912 | " [-E log_file] [-f config_file] [-g login_grace_time]\n" |
naddy@openbsd.org | c38ea63 | 2016-08-15 12:27:56 +0000 | [diff] [blame] | 913 | " [-h host_key_file] [-o option] [-p port] [-u len]\n" |
Damien Miller | b408786 | 2004-03-22 09:35:21 +1100 | [diff] [blame] | 914 | ); |
Ben Lindstrom | ade03f6 | 2001-12-06 18:22:17 +0000 | [diff] [blame] | 915 | exit(1); |
| 916 | } |
| 917 | |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 918 | static void |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 919 | send_rexec_state(int fd, struct sshbuf *conf) |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 920 | { |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 921 | struct sshbuf *m; |
| 922 | int r; |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 923 | |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 924 | debug3("%s: entering fd = %d config len %zu", __func__, fd, |
| 925 | sshbuf_len(conf)); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 926 | |
| 927 | /* |
| 928 | * Protocol from reexec master to child: |
| 929 | * string configuration |
Darren Tucker | c6f8219 | 2005-09-27 22:46:32 +1000 | [diff] [blame] | 930 | * string rngseed (only if OpenSSL is not self-seeded) |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 931 | */ |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 932 | if ((m = sshbuf_new()) == NULL) |
| 933 | fatal("%s: sshbuf_new failed", __func__); |
| 934 | if ((r = sshbuf_put_stringb(m, conf)) != 0) |
| 935 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 936 | |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 937 | #if defined(WITH_OPENSSL) && !defined(OPENSSL_PRNG_ONLY) |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 938 | rexec_send_rng_seed(m); |
Darren Tucker | c6f8219 | 2005-09-27 22:46:32 +1000 | [diff] [blame] | 939 | #endif |
| 940 | |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 941 | if (ssh_msg_send(fd, 0, m) == -1) |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 942 | fatal("%s: ssh_msg_send failed", __func__); |
| 943 | |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 944 | sshbuf_free(m); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 945 | |
| 946 | debug3("%s: done", __func__); |
| 947 | } |
| 948 | |
| 949 | static void |
| 950 | recv_rexec_state(int fd, Buffer *conf) |
| 951 | { |
| 952 | Buffer m; |
| 953 | char *cp; |
| 954 | u_int len; |
| 955 | |
| 956 | debug3("%s: entering fd = %d", __func__, fd); |
| 957 | |
| 958 | buffer_init(&m); |
| 959 | |
| 960 | if (ssh_msg_recv(fd, &m) == -1) |
| 961 | fatal("%s: ssh_msg_recv failed", __func__); |
| 962 | if (buffer_get_char(&m) != 0) |
| 963 | fatal("%s: rexec version mismatch", __func__); |
| 964 | |
| 965 | cp = buffer_get_string(&m, &len); |
| 966 | if (conf != NULL) |
djm@openbsd.org | 31bc01c | 2016-05-02 14:10:58 +0000 | [diff] [blame] | 967 | buffer_append(conf, cp, len); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 968 | free(cp); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 969 | |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 970 | #if defined(WITH_OPENSSL) && !defined(OPENSSL_PRNG_ONLY) |
Darren Tucker | c6f8219 | 2005-09-27 22:46:32 +1000 | [diff] [blame] | 971 | rexec_recv_rng_seed(&m); |
| 972 | #endif |
| 973 | |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 974 | buffer_free(&m); |
| 975 | |
| 976 | debug3("%s: done", __func__); |
| 977 | } |
| 978 | |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 979 | /* Accept a connection from inetd */ |
| 980 | static void |
| 981 | server_accept_inetd(int *sock_in, int *sock_out) |
| 982 | { |
| 983 | int fd; |
| 984 | |
| 985 | startup_pipe = -1; |
| 986 | if (rexeced_flag) { |
| 987 | close(REEXEC_CONFIG_PASS_FD); |
| 988 | *sock_in = *sock_out = dup(STDIN_FILENO); |
| 989 | if (!debug_flag) { |
| 990 | startup_pipe = dup(REEXEC_STARTUP_PIPE_FD); |
| 991 | close(REEXEC_STARTUP_PIPE_FD); |
| 992 | } |
| 993 | } else { |
| 994 | *sock_in = dup(STDIN_FILENO); |
| 995 | *sock_out = dup(STDOUT_FILENO); |
| 996 | } |
| 997 | /* |
| 998 | * We intentionally do not close the descriptors 0, 1, and 2 |
| 999 | * as our code for setting the descriptors won't work if |
| 1000 | * ttyfd happens to be one of those. |
| 1001 | */ |
| 1002 | if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { |
| 1003 | dup2(fd, STDIN_FILENO); |
| 1004 | dup2(fd, STDOUT_FILENO); |
Darren Tucker | 0cca17f | 2013-06-06 08:21:14 +1000 | [diff] [blame] | 1005 | if (!log_stderr) |
| 1006 | dup2(fd, STDERR_FILENO); |
| 1007 | if (fd > (log_stderr ? STDERR_FILENO : STDOUT_FILENO)) |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1008 | close(fd); |
| 1009 | } |
| 1010 | debug("inetd sockets after dupping: %d, %d", *sock_in, *sock_out); |
| 1011 | } |
| 1012 | |
| 1013 | /* |
| 1014 | * Listen for TCP connections |
| 1015 | */ |
| 1016 | static void |
| 1017 | server_listen(void) |
| 1018 | { |
| 1019 | int ret, listen_sock, on = 1; |
| 1020 | struct addrinfo *ai; |
| 1021 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
| 1022 | |
| 1023 | for (ai = options.listen_addrs; ai; ai = ai->ai_next) { |
| 1024 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 1025 | continue; |
| 1026 | if (num_listen_socks >= MAX_LISTEN_SOCKS) |
| 1027 | fatal("Too many listen sockets. " |
| 1028 | "Enlarge MAX_LISTEN_SOCKS"); |
| 1029 | if ((ret = getnameinfo(ai->ai_addr, ai->ai_addrlen, |
| 1030 | ntop, sizeof(ntop), strport, sizeof(strport), |
| 1031 | NI_NUMERICHOST|NI_NUMERICSERV)) != 0) { |
| 1032 | error("getnameinfo failed: %.100s", |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame] | 1033 | ssh_gai_strerror(ret)); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1034 | continue; |
| 1035 | } |
| 1036 | /* Create socket for listening. */ |
Darren Tucker | 7bd98e7 | 2010-01-10 10:31:12 +1100 | [diff] [blame] | 1037 | listen_sock = socket(ai->ai_family, ai->ai_socktype, |
| 1038 | ai->ai_protocol); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1039 | if (listen_sock < 0) { |
| 1040 | /* kernel may not support ipv6 */ |
| 1041 | verbose("socket: %.100s", strerror(errno)); |
| 1042 | continue; |
| 1043 | } |
| 1044 | if (set_nonblock(listen_sock) == -1) { |
| 1045 | close(listen_sock); |
| 1046 | continue; |
| 1047 | } |
djm@openbsd.org | 8071a69 | 2017-02-24 03:16:34 +0000 | [diff] [blame] | 1048 | if (fcntl(listen_sock, F_SETFD, FD_CLOEXEC) == -1) { |
| 1049 | verbose("socket: CLOEXEC: %s", strerror(errno)); |
| 1050 | close(listen_sock); |
| 1051 | continue; |
| 1052 | } |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1053 | /* |
| 1054 | * Set socket options. |
| 1055 | * Allow local port reuse in TIME_WAIT. |
| 1056 | */ |
| 1057 | if (setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, |
| 1058 | &on, sizeof(on)) == -1) |
| 1059 | error("setsockopt SO_REUSEADDR: %s", strerror(errno)); |
| 1060 | |
Damien Miller | 49d2a28 | 2008-01-20 08:56:00 +1100 | [diff] [blame] | 1061 | /* Only communicate in IPv6 over AF_INET6 sockets. */ |
Damien Miller | 04ee0f8 | 2009-11-18 17:48:30 +1100 | [diff] [blame] | 1062 | if (ai->ai_family == AF_INET6) |
| 1063 | sock_set_v6only(listen_sock); |
Damien Miller | 49d2a28 | 2008-01-20 08:56:00 +1100 | [diff] [blame] | 1064 | |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1065 | debug("Bind to port %s on %s.", strport, ntop); |
| 1066 | |
| 1067 | /* Bind the socket to the desired port. */ |
| 1068 | if (bind(listen_sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 1069 | error("Bind to port %s on %s failed: %.200s.", |
| 1070 | strport, ntop, strerror(errno)); |
| 1071 | close(listen_sock); |
| 1072 | continue; |
| 1073 | } |
| 1074 | listen_socks[num_listen_socks] = listen_sock; |
| 1075 | num_listen_socks++; |
| 1076 | |
| 1077 | /* Start listening on the port. */ |
| 1078 | if (listen(listen_sock, SSH_LISTEN_BACKLOG) < 0) |
| 1079 | fatal("listen on [%s]:%s: %.100s", |
| 1080 | ntop, strport, strerror(errno)); |
| 1081 | logit("Server listening on %s port %s.", ntop, strport); |
| 1082 | } |
| 1083 | freeaddrinfo(options.listen_addrs); |
| 1084 | |
| 1085 | if (!num_listen_socks) |
| 1086 | fatal("Cannot bind any address."); |
| 1087 | } |
| 1088 | |
| 1089 | /* |
| 1090 | * The main TCP accept loop. Note that, for the non-debug case, returns |
| 1091 | * from this function are in a forked subprocess. |
| 1092 | */ |
| 1093 | static void |
| 1094 | server_accept_loop(int *sock_in, int *sock_out, int *newsock, int *config_s) |
| 1095 | { |
| 1096 | fd_set *fdset; |
| 1097 | int i, j, ret, maxfd; |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 1098 | int startups = 0; |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1099 | int startup_p[2] = { -1 , -1 }; |
| 1100 | struct sockaddr_storage from; |
| 1101 | socklen_t fromlen; |
| 1102 | pid_t pid; |
Damien Miller | 045bda5 | 2013-09-14 09:44:37 +1000 | [diff] [blame] | 1103 | u_char rnd[256]; |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1104 | |
| 1105 | /* setup fd set for accept */ |
| 1106 | fdset = NULL; |
| 1107 | maxfd = 0; |
| 1108 | for (i = 0; i < num_listen_socks; i++) |
| 1109 | if (listen_socks[i] > maxfd) |
| 1110 | maxfd = listen_socks[i]; |
| 1111 | /* pipes connected to unauthenticated childs */ |
| 1112 | startup_pipes = xcalloc(options.max_startups, sizeof(int)); |
| 1113 | for (i = 0; i < options.max_startups; i++) |
| 1114 | startup_pipes[i] = -1; |
| 1115 | |
| 1116 | /* |
| 1117 | * Stay listening for connections until the system crashes or |
| 1118 | * the daemon is killed with a signal. |
| 1119 | */ |
| 1120 | for (;;) { |
| 1121 | if (received_sighup) |
| 1122 | sighup_restart(); |
mmcc@openbsd.org | d59ce08 | 2015-12-10 17:08:40 +0000 | [diff] [blame] | 1123 | free(fdset); |
deraadt@openbsd.org | ce445b0 | 2015-08-20 22:32:42 +0000 | [diff] [blame] | 1124 | fdset = xcalloc(howmany(maxfd + 1, NFDBITS), |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1125 | sizeof(fd_mask)); |
| 1126 | |
| 1127 | for (i = 0; i < num_listen_socks; i++) |
| 1128 | FD_SET(listen_socks[i], fdset); |
| 1129 | for (i = 0; i < options.max_startups; i++) |
| 1130 | if (startup_pipes[i] != -1) |
| 1131 | FD_SET(startup_pipes[i], fdset); |
| 1132 | |
| 1133 | /* Wait in select until there is a connection. */ |
| 1134 | ret = select(maxfd+1, fdset, NULL, NULL, NULL); |
| 1135 | if (ret < 0 && errno != EINTR) |
| 1136 | error("select: %.100s", strerror(errno)); |
| 1137 | if (received_sigterm) { |
| 1138 | logit("Received signal %d; terminating.", |
| 1139 | (int) received_sigterm); |
| 1140 | close_listen_socks(); |
djm@openbsd.org | 161cf41 | 2014-12-22 07:55:51 +0000 | [diff] [blame] | 1141 | if (options.pid_file != NULL) |
| 1142 | unlink(options.pid_file); |
Damien Miller | 26b57ce | 2011-05-05 14:15:09 +1000 | [diff] [blame] | 1143 | exit(received_sigterm == SIGTERM ? 0 : 255); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1144 | } |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1145 | if (ret < 0) |
| 1146 | continue; |
| 1147 | |
| 1148 | for (i = 0; i < options.max_startups; i++) |
| 1149 | if (startup_pipes[i] != -1 && |
| 1150 | FD_ISSET(startup_pipes[i], fdset)) { |
| 1151 | /* |
| 1152 | * the read end of the pipe is ready |
| 1153 | * if the child has closed the pipe |
| 1154 | * after successful authentication |
| 1155 | * or if the child has died |
| 1156 | */ |
| 1157 | close(startup_pipes[i]); |
| 1158 | startup_pipes[i] = -1; |
| 1159 | startups--; |
| 1160 | } |
| 1161 | for (i = 0; i < num_listen_socks; i++) { |
| 1162 | if (!FD_ISSET(listen_socks[i], fdset)) |
| 1163 | continue; |
| 1164 | fromlen = sizeof(from); |
| 1165 | *newsock = accept(listen_socks[i], |
| 1166 | (struct sockaddr *)&from, &fromlen); |
| 1167 | if (*newsock < 0) { |
Damien Miller | 37f1c08 | 2013-04-23 15:20:43 +1000 | [diff] [blame] | 1168 | if (errno != EINTR && errno != EWOULDBLOCK && |
| 1169 | errno != ECONNABORTED && errno != EAGAIN) |
Damien Miller | a116d13 | 2012-04-22 11:23:46 +1000 | [diff] [blame] | 1170 | error("accept: %.100s", |
| 1171 | strerror(errno)); |
| 1172 | if (errno == EMFILE || errno == ENFILE) |
| 1173 | usleep(100 * 1000); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1174 | continue; |
| 1175 | } |
| 1176 | if (unset_nonblock(*newsock) == -1) { |
| 1177 | close(*newsock); |
| 1178 | continue; |
| 1179 | } |
| 1180 | if (drop_connection(startups) == 1) { |
djm@openbsd.org | 08a1e70 | 2016-12-09 03:04:29 +0000 | [diff] [blame] | 1181 | char *laddr = get_local_ipaddr(*newsock); |
| 1182 | char *raddr = get_peer_ipaddr(*newsock); |
| 1183 | |
| 1184 | verbose("drop connection #%d from [%s]:%d " |
| 1185 | "on [%s]:%d past MaxStartups", startups, |
| 1186 | raddr, get_peer_port(*newsock), |
| 1187 | laddr, get_local_port(*newsock)); |
| 1188 | free(laddr); |
| 1189 | free(raddr); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1190 | close(*newsock); |
| 1191 | continue; |
| 1192 | } |
| 1193 | if (pipe(startup_p) == -1) { |
| 1194 | close(*newsock); |
| 1195 | continue; |
| 1196 | } |
| 1197 | |
| 1198 | if (rexec_flag && socketpair(AF_UNIX, |
| 1199 | SOCK_STREAM, 0, config_s) == -1) { |
| 1200 | error("reexec socketpair: %s", |
| 1201 | strerror(errno)); |
| 1202 | close(*newsock); |
| 1203 | close(startup_p[0]); |
| 1204 | close(startup_p[1]); |
| 1205 | continue; |
| 1206 | } |
| 1207 | |
| 1208 | for (j = 0; j < options.max_startups; j++) |
| 1209 | if (startup_pipes[j] == -1) { |
| 1210 | startup_pipes[j] = startup_p[0]; |
| 1211 | if (maxfd < startup_p[0]) |
| 1212 | maxfd = startup_p[0]; |
| 1213 | startups++; |
| 1214 | break; |
| 1215 | } |
| 1216 | |
| 1217 | /* |
| 1218 | * Got connection. Fork a child to handle it, unless |
| 1219 | * we are in debugging mode. |
| 1220 | */ |
| 1221 | if (debug_flag) { |
| 1222 | /* |
| 1223 | * In debugging mode. Close the listening |
| 1224 | * socket, and start processing the |
| 1225 | * connection without forking. |
| 1226 | */ |
| 1227 | debug("Server will not fork when running in debugging mode."); |
| 1228 | close_listen_socks(); |
| 1229 | *sock_in = *newsock; |
| 1230 | *sock_out = *newsock; |
| 1231 | close(startup_p[0]); |
| 1232 | close(startup_p[1]); |
| 1233 | startup_pipe = -1; |
| 1234 | pid = getpid(); |
| 1235 | if (rexec_flag) { |
| 1236 | send_rexec_state(config_s[0], |
| 1237 | &cfg); |
| 1238 | close(config_s[0]); |
| 1239 | } |
| 1240 | break; |
| 1241 | } |
| 1242 | |
| 1243 | /* |
| 1244 | * Normal production daemon. Fork, and have |
| 1245 | * the child process the connection. The |
| 1246 | * parent continues listening. |
| 1247 | */ |
Damien Miller | 1b06dc3 | 2006-08-31 03:24:41 +1000 | [diff] [blame] | 1248 | platform_pre_fork(); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1249 | if ((pid = fork()) == 0) { |
| 1250 | /* |
| 1251 | * Child. Close the listening and |
| 1252 | * max_startup sockets. Start using |
| 1253 | * the accepted socket. Reinitialize |
| 1254 | * logging (since our pid has changed). |
| 1255 | * We break out of the loop to handle |
| 1256 | * the connection. |
| 1257 | */ |
Damien Miller | 1b06dc3 | 2006-08-31 03:24:41 +1000 | [diff] [blame] | 1258 | platform_post_fork_child(); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1259 | startup_pipe = startup_p[1]; |
| 1260 | close_startup_pipes(); |
| 1261 | close_listen_socks(); |
| 1262 | *sock_in = *newsock; |
| 1263 | *sock_out = *newsock; |
| 1264 | log_init(__progname, |
| 1265 | options.log_level, |
| 1266 | options.log_facility, |
| 1267 | log_stderr); |
| 1268 | if (rexec_flag) |
| 1269 | close(config_s[0]); |
| 1270 | break; |
| 1271 | } |
| 1272 | |
| 1273 | /* Parent. Stay in the loop. */ |
Damien Miller | 1b06dc3 | 2006-08-31 03:24:41 +1000 | [diff] [blame] | 1274 | platform_post_fork_parent(pid); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1275 | if (pid < 0) |
| 1276 | error("fork: %.100s", strerror(errno)); |
| 1277 | else |
| 1278 | debug("Forked child %ld.", (long)pid); |
| 1279 | |
| 1280 | close(startup_p[1]); |
| 1281 | |
| 1282 | if (rexec_flag) { |
| 1283 | send_rexec_state(config_s[0], &cfg); |
| 1284 | close(config_s[0]); |
| 1285 | close(config_s[1]); |
| 1286 | } |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1287 | close(*newsock); |
| 1288 | |
| 1289 | /* |
| 1290 | * Ensure that our random state differs |
| 1291 | * from that of the child |
| 1292 | */ |
| 1293 | arc4random_stir(); |
Damien Miller | 045bda5 | 2013-09-14 09:44:37 +1000 | [diff] [blame] | 1294 | arc4random_buf(rnd, sizeof(rnd)); |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 1295 | #ifdef WITH_OPENSSL |
Damien Miller | 045bda5 | 2013-09-14 09:44:37 +1000 | [diff] [blame] | 1296 | RAND_seed(rnd, sizeof(rnd)); |
Damien Miller | 07889c7 | 2015-11-14 18:44:49 +1100 | [diff] [blame] | 1297 | if ((RAND_bytes((u_char *)rnd, 1)) != 1) |
| 1298 | fatal("%s: RAND_bytes failed", __func__); |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 1299 | #endif |
Damien Miller | 1d2c456 | 2014-02-04 11:18:20 +1100 | [diff] [blame] | 1300 | explicit_bzero(rnd, sizeof(rnd)); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1301 | } |
| 1302 | |
| 1303 | /* child process check (or debug mode) */ |
| 1304 | if (num_listen_socks < 0) |
| 1305 | break; |
| 1306 | } |
| 1307 | } |
| 1308 | |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1309 | /* |
| 1310 | * If IP options are supported, make sure there are none (log and |
| 1311 | * return an error if any are found). Basically we are worried about |
| 1312 | * source routing; it can be used to pretend you are somebody |
| 1313 | * (ip-address) you are not. That itself may be "almost acceptable" |
| 1314 | * under certain circumstances, but rhosts autentication is useless |
| 1315 | * if source routing is accepted. Notice also that if we just dropped |
| 1316 | * source routing here, the other side could use IP spoofing to do |
| 1317 | * rest of the interaction and could still bypass security. So we |
| 1318 | * exit here if we detect any IP options. |
| 1319 | */ |
| 1320 | static void |
| 1321 | check_ip_options(struct ssh *ssh) |
| 1322 | { |
| 1323 | #ifdef IP_OPTIONS |
| 1324 | int sock_in = ssh_packet_get_connection_in(ssh); |
| 1325 | struct sockaddr_storage from; |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1326 | u_char opts[200]; |
djm@openbsd.org | dc664d1 | 2016-08-28 22:28:12 +0000 | [diff] [blame] | 1327 | socklen_t i, option_size = sizeof(opts), fromlen = sizeof(from); |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1328 | char text[sizeof(opts) * 3 + 1]; |
| 1329 | |
| 1330 | memset(&from, 0, sizeof(from)); |
| 1331 | if (getpeername(sock_in, (struct sockaddr *)&from, |
| 1332 | &fromlen) < 0) |
| 1333 | return; |
| 1334 | if (from.ss_family != AF_INET) |
| 1335 | return; |
| 1336 | /* XXX IPv6 options? */ |
| 1337 | |
| 1338 | if (getsockopt(sock_in, IPPROTO_IP, IP_OPTIONS, opts, |
| 1339 | &option_size) >= 0 && option_size != 0) { |
| 1340 | text[0] = '\0'; |
| 1341 | for (i = 0; i < option_size; i++) |
| 1342 | snprintf(text + i*3, sizeof(text) - i*3, |
| 1343 | " %2.2x", opts[i]); |
| 1344 | fatal("Connection from %.100s port %d with IP opts: %.800s", |
| 1345 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), text); |
| 1346 | } |
| 1347 | return; |
| 1348 | #endif /* IP_OPTIONS */ |
| 1349 | } |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1350 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1351 | /* |
| 1352 | * Main program for the daemon. |
| 1353 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1354 | int |
| 1355 | main(int ac, char **av) |
| 1356 | { |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1357 | struct ssh *ssh = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1358 | extern char *optarg; |
| 1359 | extern int optind; |
dtucker@openbsd.org | 7fc4766 | 2016-11-30 00:28:31 +0000 | [diff] [blame] | 1360 | int r, opt, i, j, on = 1, already_daemon; |
Damien Miller | 386c6a2 | 2004-06-30 22:40:20 +1000 | [diff] [blame] | 1361 | int sock_in = -1, sock_out = -1, newsock = -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1362 | const char *remote_ip; |
| 1363 | int remote_port; |
dtucker@openbsd.org | 15fdfc9 | 2015-04-15 23:23:25 +0000 | [diff] [blame] | 1364 | char *fp, *line, *laddr, *logfile = NULL; |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1365 | int config_s[2] = { -1 , -1 }; |
Damien Miller | a6e3f01 | 2012-11-04 23:21:40 +1100 | [diff] [blame] | 1366 | u_int n; |
Damien Miller | b61f3fc | 2008-07-11 17:36:48 +1000 | [diff] [blame] | 1367 | u_int64_t ibytes, obytes; |
Damien Miller | 6ca16c6 | 2008-06-16 07:50:58 +1000 | [diff] [blame] | 1368 | mode_t new_umask; |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame^] | 1369 | struct sshkey *key; |
| 1370 | struct sshkey *pubkey; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1371 | int keytype; |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1372 | Authctxt *authctxt; |
Darren Tucker | fbcf827 | 2012-05-19 19:37:01 +1000 | [diff] [blame] | 1373 | struct connection_info *connection_info = get_connection_info(0, 0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1374 | |
dtucker@openbsd.org | ffb1e7e | 2016-02-15 09:47:49 +0000 | [diff] [blame] | 1375 | ssh_malloc_init(); /* must be called before any mallocs */ |
| 1376 | |
Kevin Steves | 0ea1d9d | 2002-04-25 18:17:04 +0000 | [diff] [blame] | 1377 | #ifdef HAVE_SECUREWARE |
| 1378 | (void)set_auth_parameters(ac, av); |
| 1379 | #endif |
Damien Miller | 59d3d5b | 2003-08-22 09:34:41 +1000 | [diff] [blame] | 1380 | __progname = ssh_get_progname(av[0]); |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 1381 | |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 1382 | /* Save argv. Duplicate so setproctitle emulation doesn't clobber it */ |
Damien Miller | b8c656e | 2000-06-28 15:22:41 +1000 | [diff] [blame] | 1383 | saved_argc = ac; |
Darren Tucker | 17c5d03 | 2004-06-25 14:22:23 +1000 | [diff] [blame] | 1384 | rexec_argc = ac; |
Darren Tucker | d8093e4 | 2006-05-04 16:24:34 +1000 | [diff] [blame] | 1385 | saved_argv = xcalloc(ac + 1, sizeof(*saved_argv)); |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 1386 | for (i = 0; i < ac; i++) |
| 1387 | saved_argv[i] = xstrdup(av[i]); |
Damien Miller | 04cb536 | 2003-05-15 21:29:10 +1000 | [diff] [blame] | 1388 | saved_argv[i] = NULL; |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 1389 | |
| 1390 | #ifndef HAVE_SETPROCTITLE |
| 1391 | /* Prepare for later setproctitle emulation */ |
| 1392 | compat_init_setproctitle(ac, av); |
Damien Miller | f2e3e9d | 2003-06-02 12:15:54 +1000 | [diff] [blame] | 1393 | av = saved_argv; |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 1394 | #endif |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1395 | |
Damien Miller | bfba354 | 2004-03-22 09:29:57 +1100 | [diff] [blame] | 1396 | if (geteuid() == 0 && setgroups(0, NULL) == -1) |
| 1397 | debug("setgroups(): %.200s", strerror(errno)); |
| 1398 | |
Darren Tucker | ce321d8 | 2005-10-03 18:11:24 +1000 | [diff] [blame] | 1399 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
| 1400 | sanitise_stdfd(); |
| 1401 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1402 | /* Initialize configuration options to their default values. */ |
| 1403 | initialize_server_options(&options); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1404 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1405 | /* Parse command-line arguments. */ |
djm@openbsd.org | 3e91b4e | 2015-05-24 23:39:16 +0000 | [diff] [blame] | 1406 | while ((opt = getopt(ac, av, |
| 1407 | "C:E:b:c:f:g:h:k:o:p:u:46DQRTdeiqrt")) != -1) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1408 | switch (opt) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1409 | case '4': |
Darren Tucker | 0f38323 | 2005-01-20 10:57:56 +1100 | [diff] [blame] | 1410 | options.address_family = AF_INET; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1411 | break; |
| 1412 | case '6': |
Darren Tucker | 0f38323 | 2005-01-20 10:57:56 +1100 | [diff] [blame] | 1413 | options.address_family = AF_INET6; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1414 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1415 | case 'f': |
| 1416 | config_file_name = optarg; |
| 1417 | break; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1418 | case 'c': |
| 1419 | if (options.num_host_cert_files >= MAX_HOSTCERTS) { |
| 1420 | fprintf(stderr, "too many host certificates.\n"); |
| 1421 | exit(1); |
| 1422 | } |
| 1423 | options.host_cert_files[options.num_host_cert_files++] = |
| 1424 | derelativise_path(optarg); |
| 1425 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1426 | case 'd': |
Darren Tucker | e98dfa3 | 2003-07-19 19:54:31 +1000 | [diff] [blame] | 1427 | if (debug_flag == 0) { |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1428 | debug_flag = 1; |
| 1429 | options.log_level = SYSLOG_LEVEL_DEBUG1; |
Darren Tucker | e98dfa3 | 2003-07-19 19:54:31 +1000 | [diff] [blame] | 1430 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1431 | options.log_level++; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1432 | break; |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 1433 | case 'D': |
| 1434 | no_daemon_flag = 1; |
| 1435 | break; |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 1436 | case 'E': |
dtucker@openbsd.org | 4f7cc2f | 2015-09-04 08:21:47 +0000 | [diff] [blame] | 1437 | logfile = optarg; |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 1438 | /* FALLTHROUGH */ |
Ben Lindstrom | 9fce9f0 | 2001-04-11 23:10:09 +0000 | [diff] [blame] | 1439 | case 'e': |
| 1440 | log_stderr = 1; |
| 1441 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1442 | case 'i': |
| 1443 | inetd_flag = 1; |
| 1444 | break; |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1445 | case 'r': |
| 1446 | rexec_flag = 0; |
| 1447 | break; |
| 1448 | case 'R': |
| 1449 | rexeced_flag = 1; |
| 1450 | inetd_flag = 1; |
| 1451 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1452 | case 'Q': |
Ben Lindstrom | d539020 | 2001-01-29 08:07:43 +0000 | [diff] [blame] | 1453 | /* ignored */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1454 | break; |
| 1455 | case 'q': |
| 1456 | options.log_level = SYSLOG_LEVEL_QUIET; |
| 1457 | break; |
| 1458 | case 'b': |
naddy@openbsd.org | c38ea63 | 2016-08-15 12:27:56 +0000 | [diff] [blame] | 1459 | /* protocol 1, ignored */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1460 | break; |
| 1461 | case 'p': |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1462 | options.ports_from_cmdline = 1; |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1463 | if (options.num_ports >= MAX_PORTS) { |
| 1464 | fprintf(stderr, "too many ports.\n"); |
| 1465 | exit(1); |
| 1466 | } |
Ben Lindstrom | 19066a1 | 2001-04-12 23:39:26 +0000 | [diff] [blame] | 1467 | options.ports[options.num_ports++] = a2port(optarg); |
Damien Miller | 3dc71ad | 2009-01-28 16:31:22 +1100 | [diff] [blame] | 1468 | if (options.ports[options.num_ports-1] <= 0) { |
Ben Lindstrom | 19066a1 | 2001-04-12 23:39:26 +0000 | [diff] [blame] | 1469 | fprintf(stderr, "Bad port number.\n"); |
| 1470 | exit(1); |
| 1471 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1472 | break; |
| 1473 | case 'g': |
Ben Lindstrom | 1bda4c8 | 2001-06-05 19:59:08 +0000 | [diff] [blame] | 1474 | if ((options.login_grace_time = convtime(optarg)) == -1) { |
| 1475 | fprintf(stderr, "Invalid login grace time.\n"); |
| 1476 | exit(1); |
| 1477 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1478 | break; |
| 1479 | case 'k': |
naddy@openbsd.org | c38ea63 | 2016-08-15 12:27:56 +0000 | [diff] [blame] | 1480 | /* protocol 1, ignored */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1481 | break; |
| 1482 | case 'h': |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1483 | if (options.num_host_key_files >= MAX_HOSTKEYS) { |
| 1484 | fprintf(stderr, "too many host keys.\n"); |
| 1485 | exit(1); |
| 1486 | } |
Darren Tucker | 88b6fb2 | 2010-01-13 22:44:29 +1100 | [diff] [blame] | 1487 | options.host_key_files[options.num_host_key_files++] = |
| 1488 | derelativise_path(optarg); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1489 | break; |
Ben Lindstrom | 794325a | 2001-08-06 21:09:07 +0000 | [diff] [blame] | 1490 | case 't': |
| 1491 | test_flag = 1; |
| 1492 | break; |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 1493 | case 'T': |
| 1494 | test_flag = 2; |
| 1495 | break; |
| 1496 | case 'C': |
Darren Tucker | fbcf827 | 2012-05-19 19:37:01 +1000 | [diff] [blame] | 1497 | if (parse_server_match_testspec(connection_info, |
| 1498 | optarg) == -1) |
| 1499 | exit(1); |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 1500 | break; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 1501 | case 'u': |
deraadt@openbsd.org | 087266e | 2015-01-20 23:14:00 +0000 | [diff] [blame] | 1502 | utmp_len = (u_int)strtonum(optarg, 0, HOST_NAME_MAX+1+1, NULL); |
| 1503 | if (utmp_len > HOST_NAME_MAX+1) { |
Ben Lindstrom | 41daec7 | 2002-07-23 21:15:13 +0000 | [diff] [blame] | 1504 | fprintf(stderr, "Invalid utmp length.\n"); |
| 1505 | exit(1); |
| 1506 | } |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 1507 | break; |
Ben Lindstrom | ade03f6 | 2001-12-06 18:22:17 +0000 | [diff] [blame] | 1508 | case 'o': |
Damien Miller | b999719 | 2003-12-17 16:29:22 +1100 | [diff] [blame] | 1509 | line = xstrdup(optarg); |
| 1510 | if (process_server_config_line(&options, line, |
Darren Tucker | fbcf827 | 2012-05-19 19:37:01 +1000 | [diff] [blame] | 1511 | "command-line", 0, NULL, NULL) != 0) |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1512 | exit(1); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1513 | free(line); |
Ben Lindstrom | ade03f6 | 2001-12-06 18:22:17 +0000 | [diff] [blame] | 1514 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1515 | case '?': |
| 1516 | default: |
Ben Lindstrom | ade03f6 | 2001-12-06 18:22:17 +0000 | [diff] [blame] | 1517 | usage(); |
| 1518 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1519 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1520 | } |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1521 | if (rexeced_flag || inetd_flag) |
| 1522 | rexec_flag = 0; |
Damien Miller | 2ee0c43 | 2008-03-07 18:31:47 +1100 | [diff] [blame] | 1523 | if (!test_flag && (rexec_flag && (av[0] == NULL || *av[0] != '/'))) |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1524 | fatal("sshd re-exec requires execution with an absolute path"); |
| 1525 | if (rexeced_flag) |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 1526 | closefrom(REEXEC_MIN_FREE_FD); |
| 1527 | else |
| 1528 | closefrom(REEXEC_DEVCRYPTO_RESERVED_FD); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1529 | |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 1530 | #ifdef WITH_OPENSSL |
Damien Miller | 4314c2b | 2010-09-10 11:12:09 +1000 | [diff] [blame] | 1531 | OpenSSL_add_all_algorithms(); |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 1532 | #endif |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1533 | |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 1534 | /* If requested, redirect the logs to the specified logfile. */ |
dtucker@openbsd.org | 4f7cc2f | 2015-09-04 08:21:47 +0000 | [diff] [blame] | 1535 | if (logfile != NULL) |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 1536 | log_redirect_stderr_to(logfile); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1537 | /* |
| 1538 | * Force logging to stderr until we have loaded the private host |
| 1539 | * key (unless started from inetd) |
| 1540 | */ |
Kevin Steves | ec84dc1 | 2000-12-13 17:45:15 +0000 | [diff] [blame] | 1541 | log_init(__progname, |
Damien Miller | 5aa5d78 | 2002-02-08 22:01:54 +1100 | [diff] [blame] | 1542 | options.log_level == SYSLOG_LEVEL_NOT_SET ? |
| 1543 | SYSLOG_LEVEL_INFO : options.log_level, |
| 1544 | options.log_facility == SYSLOG_FACILITY_NOT_SET ? |
| 1545 | SYSLOG_FACILITY_AUTH : options.log_facility, |
Ben Lindstrom | c2faa4a | 2002-11-09 15:50:03 +0000 | [diff] [blame] | 1546 | log_stderr || !inetd_flag); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1547 | |
Darren Tucker | 86c093d | 2004-03-08 22:59:03 +1100 | [diff] [blame] | 1548 | /* |
| 1549 | * Unset KRB5CCNAME, otherwise the user's session may inherit it from |
| 1550 | * root's environment |
Damien Miller | 94cf4c8 | 2005-07-17 17:04:47 +1000 | [diff] [blame] | 1551 | */ |
Darren Tucker | 9dc6c7d | 2005-02-02 18:30:33 +1100 | [diff] [blame] | 1552 | if (getenv("KRB5CCNAME") != NULL) |
Tim Rice | e3609c9 | 2012-02-14 10:03:30 -0800 | [diff] [blame] | 1553 | (void) unsetenv("KRB5CCNAME"); |
Darren Tucker | 9dc6c7d | 2005-02-02 18:30:33 +1100 | [diff] [blame] | 1554 | |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 1555 | #ifdef _UNICOS |
Darren Tucker | 1298496 | 2004-05-24 13:37:13 +1000 | [diff] [blame] | 1556 | /* Cray can define user privs drop all privs now! |
Ben Lindstrom | 6db66ff | 2001-08-06 23:29:16 +0000 | [diff] [blame] | 1557 | * Not needed on PRIV_SU systems! |
| 1558 | */ |
| 1559 | drop_cray_privs(); |
| 1560 | #endif |
| 1561 | |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1562 | sensitive_data.have_ssh2_key = 0; |
| 1563 | |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 1564 | /* |
| 1565 | * If we're doing an extended config test, make sure we have all of |
| 1566 | * the parameters we need. If we're not doing an extended test, |
| 1567 | * do not silently ignore connection test params. |
| 1568 | */ |
Darren Tucker | fbcf827 | 2012-05-19 19:37:01 +1000 | [diff] [blame] | 1569 | if (test_flag >= 2 && server_match_spec_complete(connection_info) == 0) |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 1570 | fatal("user, host and addr are all required when testing " |
| 1571 | "Match configs"); |
Darren Tucker | fbcf827 | 2012-05-19 19:37:01 +1000 | [diff] [blame] | 1572 | if (test_flag < 2 && server_match_spec_complete(connection_info) >= 0) |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 1573 | fatal("Config test connection parameter (-C) provided without " |
| 1574 | "test mode (-T)"); |
| 1575 | |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1576 | /* Fetch our configuration */ |
| 1577 | buffer_init(&cfg); |
| 1578 | if (rexeced_flag) |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 1579 | recv_rexec_state(REEXEC_CONFIG_PASS_FD, &cfg); |
djm@openbsd.org | dbcc652 | 2015-04-27 00:21:21 +0000 | [diff] [blame] | 1580 | else if (strcasecmp(config_file_name, "none") != 0) |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1581 | load_server_config(config_file_name, &cfg); |
| 1582 | |
Darren Tucker | 4515047 | 2006-07-12 22:34:17 +1000 | [diff] [blame] | 1583 | parse_server_config(&options, rexeced_flag ? "rexec" : config_file_name, |
Darren Tucker | fbcf827 | 2012-05-19 19:37:01 +1000 | [diff] [blame] | 1584 | &cfg, NULL); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1585 | |
Darren Tucker | c6f8219 | 2005-09-27 22:46:32 +1000 | [diff] [blame] | 1586 | seed_rng(); |
| 1587 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1588 | /* Fill in default values for those options not explicitly set. */ |
| 1589 | fill_default_server_options(&options); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1590 | |
Darren Tucker | 97b1bb5 | 2007-03-21 20:38:53 +1100 | [diff] [blame] | 1591 | /* challenge-response is implemented via keyboard interactive */ |
| 1592 | if (options.challenge_response_authentication) |
| 1593 | options.kbd_interactive_authentication = 1; |
| 1594 | |
Damien Miller | d0d1099 | 2012-11-04 22:23:14 +1100 | [diff] [blame] | 1595 | /* Check that options are sensible */ |
| 1596 | if (options.authorized_keys_command_user == NULL && |
| 1597 | (options.authorized_keys_command != NULL && |
| 1598 | strcasecmp(options.authorized_keys_command, "none") != 0)) |
| 1599 | fatal("AuthorizedKeysCommand set without " |
| 1600 | "AuthorizedKeysCommandUser"); |
djm@openbsd.org | bcc50d8 | 2015-05-21 06:43:30 +0000 | [diff] [blame] | 1601 | if (options.authorized_principals_command_user == NULL && |
| 1602 | (options.authorized_principals_command != NULL && |
| 1603 | strcasecmp(options.authorized_principals_command, "none") != 0)) |
| 1604 | fatal("AuthorizedPrincipalsCommand set without " |
| 1605 | "AuthorizedPrincipalsCommandUser"); |
Damien Miller | d0d1099 | 2012-11-04 22:23:14 +1100 | [diff] [blame] | 1606 | |
Damien Miller | a6e3f01 | 2012-11-04 23:21:40 +1100 | [diff] [blame] | 1607 | /* |
| 1608 | * Check whether there is any path through configured auth methods. |
| 1609 | * Unfortunately it is not possible to verify this generally before |
| 1610 | * daemonisation in the presence of Match block, but this catches |
| 1611 | * and warns for trivial misconfigurations that could break login. |
| 1612 | */ |
| 1613 | if (options.num_auth_methods != 0) { |
Damien Miller | a6e3f01 | 2012-11-04 23:21:40 +1100 | [diff] [blame] | 1614 | for (n = 0; n < options.num_auth_methods; n++) { |
| 1615 | if (auth2_methods_valid(options.auth_methods[n], |
| 1616 | 1) == 0) |
| 1617 | break; |
| 1618 | } |
| 1619 | if (n >= options.num_auth_methods) |
| 1620 | fatal("AuthenticationMethods cannot be satisfied by " |
| 1621 | "enabled authentication methods"); |
| 1622 | } |
| 1623 | |
Darren Tucker | 7bd98e7 | 2010-01-10 10:31:12 +1100 | [diff] [blame] | 1624 | /* set default channel AF */ |
Darren Tucker | 0f38323 | 2005-01-20 10:57:56 +1100 | [diff] [blame] | 1625 | channel_set_af(options.address_family); |
| 1626 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1627 | /* Check that there are no remaining arguments. */ |
| 1628 | if (optind < ac) { |
| 1629 | fprintf(stderr, "Extra argument %s.\n", av[optind]); |
| 1630 | exit(1); |
| 1631 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1632 | |
Damien Miller | 22e8a1e | 2013-02-12 11:04:48 +1100 | [diff] [blame] | 1633 | debug("sshd version %s, %s", SSH_VERSION, |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 1634 | #ifdef WITH_OPENSSL |
| 1635 | SSLeay_version(SSLEAY_VERSION) |
| 1636 | #else |
| 1637 | "without OpenSSL" |
| 1638 | #endif |
| 1639 | ); |
Damien Miller | 2ccf661 | 1999-11-15 15:25:10 +1100 | [diff] [blame] | 1640 | |
Darren Tucker | df0e438 | 2006-11-07 11:28:40 +1100 | [diff] [blame] | 1641 | /* Store privilege separation user for later use if required. */ |
Darren Tucker | d13281f | 2017-03-29 12:39:39 +1100 | [diff] [blame] | 1642 | privsep_chroot = use_privsep && (getuid() == 0 || geteuid() == 0); |
Darren Tucker | df0e438 | 2006-11-07 11:28:40 +1100 | [diff] [blame] | 1643 | if ((privsep_pw = getpwnam(SSH_PRIVSEP_USER)) == NULL) { |
Darren Tucker | d13281f | 2017-03-29 12:39:39 +1100 | [diff] [blame] | 1644 | if (privsep_chroot || options.kerberos_authentication) |
Darren Tucker | df0e438 | 2006-11-07 11:28:40 +1100 | [diff] [blame] | 1645 | fatal("Privilege separation user %s does not exist", |
| 1646 | SSH_PRIVSEP_USER); |
| 1647 | } else { |
Damien Miller | a5103f4 | 2014-02-04 11:20:14 +1100 | [diff] [blame] | 1648 | explicit_bzero(privsep_pw->pw_passwd, |
| 1649 | strlen(privsep_pw->pw_passwd)); |
Darren Tucker | df0e438 | 2006-11-07 11:28:40 +1100 | [diff] [blame] | 1650 | privsep_pw = pwcopy(privsep_pw); |
Darren Tucker | f60845f | 2013-06-02 08:07:31 +1000 | [diff] [blame] | 1651 | free(privsep_pw->pw_passwd); |
Darren Tucker | df0e438 | 2006-11-07 11:28:40 +1100 | [diff] [blame] | 1652 | privsep_pw->pw_passwd = xstrdup("*"); |
| 1653 | } |
Damien Miller | 6433df0 | 2006-09-07 10:36:43 +1000 | [diff] [blame] | 1654 | endpwent(); |
| 1655 | |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1656 | /* load host keys */ |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 1657 | sensitive_data.host_keys = xcalloc(options.num_host_key_files, |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame^] | 1658 | sizeof(struct sshkey *)); |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1659 | sensitive_data.host_pubkeys = xcalloc(options.num_host_key_files, |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame^] | 1660 | sizeof(struct sshkey *)); |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1661 | |
| 1662 | if (options.host_key_agent) { |
| 1663 | if (strcmp(options.host_key_agent, SSH_AUTHSOCKET_ENV_NAME)) |
| 1664 | setenv(SSH_AUTHSOCKET_ENV_NAME, |
| 1665 | options.host_key_agent, 1); |
djm@openbsd.org | 83f8ffa | 2015-01-17 18:53:34 +0000 | [diff] [blame] | 1666 | if ((r = ssh_get_authentication_socket(NULL)) == 0) |
| 1667 | have_agent = 1; |
| 1668 | else |
| 1669 | error("Could not connect to agent \"%s\": %s", |
| 1670 | options.host_key_agent, ssh_err(r)); |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1671 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1672 | |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1673 | for (i = 0; i < options.num_host_key_files; i++) { |
djm@openbsd.org | 161cf41 | 2014-12-22 07:55:51 +0000 | [diff] [blame] | 1674 | if (options.host_key_files[i] == NULL) |
| 1675 | continue; |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 1676 | key = key_load_private(options.host_key_files[i], "", NULL); |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1677 | pubkey = key_load_public(options.host_key_files[i], NULL); |
djm@openbsd.org | a8c5eea | 2017-03-15 02:19:09 +0000 | [diff] [blame] | 1678 | |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 1679 | if (pubkey == NULL && key != NULL) |
| 1680 | pubkey = key_demote(key); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 1681 | sensitive_data.host_keys[i] = key; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1682 | sensitive_data.host_pubkeys[i] = pubkey; |
| 1683 | |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 1684 | if (key == NULL && pubkey != NULL && have_agent) { |
djm@openbsd.org | ce63c4b | 2015-02-16 22:30:03 +0000 | [diff] [blame] | 1685 | debug("will rely on agent for hostkey %s", |
| 1686 | options.host_key_files[i]); |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1687 | keytype = pubkey->type; |
| 1688 | } else if (key != NULL) { |
| 1689 | keytype = key->type; |
| 1690 | } else { |
Ben Lindstrom | 15f3386 | 2001-04-16 02:00:02 +0000 | [diff] [blame] | 1691 | error("Could not load host key: %s", |
| 1692 | options.host_key_files[i]); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 1693 | sensitive_data.host_keys[i] = NULL; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1694 | sensitive_data.host_pubkeys[i] = NULL; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1695 | continue; |
| 1696 | } |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1697 | |
| 1698 | switch (keytype) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1699 | case KEY_RSA: |
| 1700 | case KEY_DSA: |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 1701 | case KEY_ECDSA: |
Damien Miller | 5be9d9e | 2013-12-07 11:24:01 +1100 | [diff] [blame] | 1702 | case KEY_ED25519: |
djm@openbsd.org | 6049a54 | 2015-01-31 20:30:05 +0000 | [diff] [blame] | 1703 | if (have_agent || key != NULL) |
| 1704 | sensitive_data.have_ssh2_key = 1; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1705 | break; |
| 1706 | } |
djm@openbsd.org | 6049a54 | 2015-01-31 20:30:05 +0000 | [diff] [blame] | 1707 | if ((fp = sshkey_fingerprint(pubkey, options.fingerprint_hash, |
| 1708 | SSH_FP_DEFAULT)) == NULL) |
| 1709 | fatal("sshkey_fingerprint failed"); |
| 1710 | debug("%s host key #%d: %s %s", |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 1711 | key ? "private" : "agent", i, sshkey_ssh_name(pubkey), fp); |
djm@openbsd.org | 6049a54 | 2015-01-31 20:30:05 +0000 | [diff] [blame] | 1712 | free(fp); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1713 | } |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 1714 | if (!sensitive_data.have_ssh2_key) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1715 | logit("sshd: no hostkeys available -- exiting."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1716 | exit(1); |
| 1717 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1718 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1719 | /* |
| 1720 | * Load certificates. They are stored in an array at identical |
| 1721 | * indices to the public keys that they relate to. |
| 1722 | */ |
| 1723 | sensitive_data.host_certificates = xcalloc(options.num_host_key_files, |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame^] | 1724 | sizeof(struct sshkey *)); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1725 | for (i = 0; i < options.num_host_key_files; i++) |
| 1726 | sensitive_data.host_certificates[i] = NULL; |
| 1727 | |
| 1728 | for (i = 0; i < options.num_host_cert_files; i++) { |
djm@openbsd.org | 161cf41 | 2014-12-22 07:55:51 +0000 | [diff] [blame] | 1729 | if (options.host_cert_files[i] == NULL) |
| 1730 | continue; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1731 | key = key_load_public(options.host_cert_files[i], NULL); |
| 1732 | if (key == NULL) { |
| 1733 | error("Could not load host certificate: %s", |
| 1734 | options.host_cert_files[i]); |
| 1735 | continue; |
| 1736 | } |
| 1737 | if (!key_is_cert(key)) { |
| 1738 | error("Certificate file is not a certificate: %s", |
| 1739 | options.host_cert_files[i]); |
| 1740 | key_free(key); |
| 1741 | continue; |
| 1742 | } |
| 1743 | /* Find matching private key */ |
| 1744 | for (j = 0; j < options.num_host_key_files; j++) { |
| 1745 | if (key_equal_public(key, |
| 1746 | sensitive_data.host_keys[j])) { |
| 1747 | sensitive_data.host_certificates[j] = key; |
| 1748 | break; |
| 1749 | } |
| 1750 | } |
| 1751 | if (j >= options.num_host_key_files) { |
| 1752 | error("No matching private key for certificate: %s", |
| 1753 | options.host_cert_files[i]); |
| 1754 | key_free(key); |
| 1755 | continue; |
| 1756 | } |
| 1757 | sensitive_data.host_certificates[j] = key; |
| 1758 | debug("host certificate: #%d type %d %s", j, key->type, |
| 1759 | key_type(key)); |
| 1760 | } |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 1761 | |
Darren Tucker | d13281f | 2017-03-29 12:39:39 +1100 | [diff] [blame] | 1762 | if (privsep_chroot) { |
Ben Lindstrom | a26ea63 | 2002-06-06 20:46:25 +0000 | [diff] [blame] | 1763 | struct stat st; |
| 1764 | |
Ben Lindstrom | a26ea63 | 2002-06-06 20:46:25 +0000 | [diff] [blame] | 1765 | if ((stat(_PATH_PRIVSEP_CHROOT_DIR, &st) == -1) || |
| 1766 | (S_ISDIR(st.st_mode) == 0)) |
| 1767 | fatal("Missing privilege separation directory: %s", |
| 1768 | _PATH_PRIVSEP_CHROOT_DIR); |
Ben Lindstrom | 5962735 | 2002-06-27 18:02:21 +0000 | [diff] [blame] | 1769 | |
| 1770 | #ifdef HAVE_CYGWIN |
| 1771 | if (check_ntsec(_PATH_PRIVSEP_CHROOT_DIR) && |
| 1772 | (st.st_uid != getuid () || |
| 1773 | (st.st_mode & (S_IWGRP|S_IWOTH)) != 0)) |
| 1774 | #else |
Ben Lindstrom | 2dfacb3 | 2002-06-23 00:33:47 +0000 | [diff] [blame] | 1775 | if (st.st_uid != 0 || (st.st_mode & (S_IWGRP|S_IWOTH)) != 0) |
Ben Lindstrom | 5962735 | 2002-06-27 18:02:21 +0000 | [diff] [blame] | 1776 | #endif |
Damien Miller | 180fc5b | 2003-02-24 11:50:18 +1100 | [diff] [blame] | 1777 | fatal("%s must be owned by root and not group or " |
| 1778 | "world-writable.", _PATH_PRIVSEP_CHROOT_DIR); |
Ben Lindstrom | a26ea63 | 2002-06-06 20:46:25 +0000 | [diff] [blame] | 1779 | } |
| 1780 | |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 1781 | if (test_flag > 1) { |
Darren Tucker | fbcf827 | 2012-05-19 19:37:01 +1000 | [diff] [blame] | 1782 | if (server_match_spec_complete(connection_info) == 1) |
| 1783 | parse_server_match_config(&options, connection_info); |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 1784 | dump_config(&options); |
| 1785 | } |
| 1786 | |
Ben Lindstrom | 794325a | 2001-08-06 21:09:07 +0000 | [diff] [blame] | 1787 | /* Configuration looks good, so exit if in test mode. */ |
| 1788 | if (test_flag) |
| 1789 | exit(0); |
| 1790 | |
Damien Miller | 87aea25 | 2002-05-10 12:20:24 +1000 | [diff] [blame] | 1791 | /* |
| 1792 | * Clear out any supplemental groups we may have inherited. This |
| 1793 | * prevents inadvertent creation of files with bad modes (in the |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 1794 | * portable version at least, it's certainly possible for PAM |
| 1795 | * to create a file, and we can't control the code in every |
Damien Miller | 87aea25 | 2002-05-10 12:20:24 +1000 | [diff] [blame] | 1796 | * module which might be used). |
| 1797 | */ |
| 1798 | if (setgroups(0, NULL) < 0) |
| 1799 | debug("setgroups() failed: %.200s", strerror(errno)); |
| 1800 | |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1801 | if (rexec_flag) { |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 1802 | rexec_argv = xcalloc(rexec_argc + 2, sizeof(char *)); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1803 | for (i = 0; i < rexec_argc; i++) { |
| 1804 | debug("rexec_argv[%d]='%s'", i, saved_argv[i]); |
| 1805 | rexec_argv[i] = saved_argv[i]; |
| 1806 | } |
| 1807 | rexec_argv[rexec_argc] = "-R"; |
| 1808 | rexec_argv[rexec_argc + 1] = NULL; |
| 1809 | } |
| 1810 | |
Damien Miller | 6ca16c6 | 2008-06-16 07:50:58 +1000 | [diff] [blame] | 1811 | /* Ensure that umask disallows at least group and world write */ |
| 1812 | new_umask = umask(0077) | 0022; |
| 1813 | (void) umask(new_umask); |
| 1814 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1815 | /* Initialize the log (it is reinitialized below in case we forked). */ |
Darren Tucker | ea7c812 | 2005-01-20 11:03:08 +1100 | [diff] [blame] | 1816 | if (debug_flag && (!inetd_flag || rexeced_flag)) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1817 | log_stderr = 1; |
Kevin Steves | ec84dc1 | 2000-12-13 17:45:15 +0000 | [diff] [blame] | 1818 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1819 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1820 | /* |
dtucker@openbsd.org | 7fc4766 | 2016-11-30 00:28:31 +0000 | [diff] [blame] | 1821 | * If not in debugging mode, not started from inetd and not already |
| 1822 | * daemonized (eg re-exec via SIGHUP), disconnect from the controlling |
| 1823 | * terminal, and fork. The original process exits. |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1824 | */ |
dtucker@openbsd.org | 7fc4766 | 2016-11-30 00:28:31 +0000 | [diff] [blame] | 1825 | already_daemon = daemonized(); |
| 1826 | if (!(debug_flag || inetd_flag || no_daemon_flag || already_daemon)) { |
dtucker@openbsd.org | b0899ee | 2016-11-29 03:54:50 +0000 | [diff] [blame] | 1827 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1828 | if (daemon(0, 0) < 0) |
| 1829 | fatal("daemon() failed: %.200s", strerror(errno)); |
| 1830 | |
dtucker@openbsd.org | b0899ee | 2016-11-29 03:54:50 +0000 | [diff] [blame] | 1831 | disconnect_controlling_tty(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1832 | } |
| 1833 | /* Reinitialize the log (because of the fork above). */ |
Kevin Steves | ec84dc1 | 2000-12-13 17:45:15 +0000 | [diff] [blame] | 1834 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1835 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1836 | /* Chdir to the root directory so that the current disk can be |
| 1837 | unmounted if desired. */ |
Darren Tucker | dbee308 | 2013-05-16 20:32:29 +1000 | [diff] [blame] | 1838 | if (chdir("/") == -1) |
| 1839 | error("chdir(\"/\"): %s", strerror(errno)); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1840 | |
Ben Lindstrom | de71cda | 2001-03-24 00:43:26 +0000 | [diff] [blame] | 1841 | /* ignore SIGPIPE */ |
| 1842 | signal(SIGPIPE, SIG_IGN); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1843 | |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1844 | /* Get a connection, either from inetd or a listening TCP socket */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1845 | if (inetd_flag) { |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1846 | server_accept_inetd(&sock_in, &sock_out); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1847 | } else { |
Darren Tucker | c8802aa | 2009-12-08 13:39:48 +1100 | [diff] [blame] | 1848 | platform_pre_listen(); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1849 | server_listen(); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1850 | |
Ben Lindstrom | 9809786 | 2001-06-25 05:10:20 +0000 | [diff] [blame] | 1851 | signal(SIGHUP, sighup_handler); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1852 | signal(SIGCHLD, main_sigchld_handler); |
Ben Lindstrom | 9809786 | 2001-06-25 05:10:20 +0000 | [diff] [blame] | 1853 | signal(SIGTERM, sigterm_handler); |
| 1854 | signal(SIGQUIT, sigterm_handler); |
| 1855 | |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1856 | /* |
| 1857 | * Write out the pid file after the sigterm handler |
| 1858 | * is setup and the listen sockets are bound |
| 1859 | */ |
dtucker@openbsd.org | f2398eb | 2016-12-04 22:27:25 +0000 | [diff] [blame] | 1860 | if (options.pid_file != NULL && !debug_flag) { |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1861 | FILE *f = fopen(options.pid_file, "w"); |
| 1862 | |
Darren Tucker | e532704 | 2003-07-03 13:40:44 +1000 | [diff] [blame] | 1863 | if (f == NULL) { |
| 1864 | error("Couldn't create pid file \"%s\": %s", |
| 1865 | options.pid_file, strerror(errno)); |
| 1866 | } else { |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1867 | fprintf(f, "%ld\n", (long) getpid()); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1868 | fclose(f); |
| 1869 | } |
| 1870 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1871 | |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1872 | /* Accept a connection and return in a forked child */ |
| 1873 | server_accept_loop(&sock_in, &sock_out, |
| 1874 | &newsock, config_s); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1875 | } |
| 1876 | |
| 1877 | /* This is the child processing a new connection. */ |
Damien Miller | 57aae98 | 2004-03-08 23:11:25 +1100 | [diff] [blame] | 1878 | setproctitle("%s", "[accepted]"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1879 | |
Darren Tucker | 6832b83 | 2004-08-12 22:36:51 +1000 | [diff] [blame] | 1880 | /* |
| 1881 | * Create a new session and process group since the 4.4BSD |
| 1882 | * setlogin() affects the entire process group. We don't |
| 1883 | * want the child to be able to affect the parent. |
| 1884 | */ |
| 1885 | #if !defined(SSHD_ACQUIRES_CTTY) |
| 1886 | /* |
| 1887 | * If setsid is called, on some platforms sshd will later acquire a |
| 1888 | * controlling terminal which will result in "could not set |
| 1889 | * controlling tty" errors. |
| 1890 | */ |
| 1891 | if (!debug_flag && !inetd_flag && setsid() < 0) |
| 1892 | error("setsid: %.100s", strerror(errno)); |
| 1893 | #endif |
| 1894 | |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1895 | if (rexec_flag) { |
| 1896 | int fd; |
| 1897 | |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 1898 | debug("rexec start in %d out %d newsock %d pipe %d sock %d", |
| 1899 | sock_in, sock_out, newsock, startup_pipe, config_s[0]); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1900 | dup2(newsock, STDIN_FILENO); |
| 1901 | dup2(STDIN_FILENO, STDOUT_FILENO); |
| 1902 | if (startup_pipe == -1) |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 1903 | close(REEXEC_STARTUP_PIPE_FD); |
Damien Miller | 61ee4d6 | 2013-10-15 11:56:47 +1100 | [diff] [blame] | 1904 | else if (startup_pipe != REEXEC_STARTUP_PIPE_FD) { |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 1905 | dup2(startup_pipe, REEXEC_STARTUP_PIPE_FD); |
Damien Miller | 61ee4d6 | 2013-10-15 11:56:47 +1100 | [diff] [blame] | 1906 | close(startup_pipe); |
| 1907 | startup_pipe = REEXEC_STARTUP_PIPE_FD; |
| 1908 | } |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1909 | |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 1910 | dup2(config_s[1], REEXEC_CONFIG_PASS_FD); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1911 | close(config_s[1]); |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 1912 | |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1913 | execv(rexec_argv[0], rexec_argv); |
| 1914 | |
| 1915 | /* Reexec has failed, fall back and continue */ |
| 1916 | error("rexec of %s failed: %s", rexec_argv[0], strerror(errno)); |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 1917 | recv_rexec_state(REEXEC_CONFIG_PASS_FD, NULL); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1918 | log_init(__progname, options.log_level, |
| 1919 | options.log_facility, log_stderr); |
| 1920 | |
| 1921 | /* Clean up fds */ |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 1922 | close(REEXEC_CONFIG_PASS_FD); |
| 1923 | newsock = sock_out = sock_in = dup(STDIN_FILENO); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1924 | if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { |
| 1925 | dup2(fd, STDIN_FILENO); |
| 1926 | dup2(fd, STDOUT_FILENO); |
| 1927 | if (fd > STDERR_FILENO) |
| 1928 | close(fd); |
| 1929 | } |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 1930 | debug("rexec cleanup in %d out %d newsock %d pipe %d sock %d", |
| 1931 | sock_in, sock_out, newsock, startup_pipe, config_s[0]); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1932 | } |
| 1933 | |
Damien Miller | 133d9d3 | 2010-01-30 17:30:04 +1100 | [diff] [blame] | 1934 | /* Executed child processes don't need these. */ |
| 1935 | fcntl(sock_out, F_SETFD, FD_CLOEXEC); |
| 1936 | fcntl(sock_in, F_SETFD, FD_CLOEXEC); |
| 1937 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1938 | /* |
| 1939 | * Disable the key regeneration alarm. We will not regenerate the |
| 1940 | * key since we are no longer in a position to give it to anyone. We |
| 1941 | * will not restart on SIGHUP since it no longer makes sense. |
| 1942 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1943 | alarm(0); |
| 1944 | signal(SIGALRM, SIG_DFL); |
| 1945 | signal(SIGHUP, SIG_DFL); |
| 1946 | signal(SIGTERM, SIG_DFL); |
| 1947 | signal(SIGQUIT, SIG_DFL); |
| 1948 | signal(SIGCHLD, SIG_DFL); |
Damien Miller | 4e0f5e1 | 2000-08-29 11:05:50 +1100 | [diff] [blame] | 1949 | signal(SIGINT, SIG_DFL); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1950 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1951 | /* |
| 1952 | * Register our connection. This turns encryption off because we do |
| 1953 | * not have a key. |
| 1954 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1955 | packet_set_connection(sock_in, sock_out); |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 1956 | packet_set_server(); |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1957 | ssh = active_state; /* XXX */ |
| 1958 | check_ip_options(ssh); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1959 | |
Damien Miller | 4f1d6b2 | 2005-05-26 11:59:32 +1000 | [diff] [blame] | 1960 | /* Set SO_KEEPALIVE if requested. */ |
| 1961 | if (options.tcp_keep_alive && packet_connection_is_on_socket() && |
| 1962 | setsockopt(sock_in, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on)) < 0) |
| 1963 | error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno)); |
| 1964 | |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1965 | if ((remote_port = ssh_remote_port(ssh)) < 0) { |
| 1966 | debug("ssh_remote_port failed"); |
Damien Miller | 677257f | 2005-06-17 12:55:03 +1000 | [diff] [blame] | 1967 | cleanup_exit(255); |
| 1968 | } |
Damien Miller | 4d3fd54 | 2005-11-05 15:13:24 +1100 | [diff] [blame] | 1969 | |
| 1970 | /* |
Damien Miller | eb13e55 | 2006-06-13 13:03:53 +1000 | [diff] [blame] | 1971 | * The rest of the code depends on the fact that |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1972 | * ssh_remote_ipaddr() caches the remote ip, even if |
Damien Miller | eb13e55 | 2006-06-13 13:03:53 +1000 | [diff] [blame] | 1973 | * the socket goes away. |
| 1974 | */ |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1975 | remote_ip = ssh_remote_ipaddr(ssh); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1976 | |
Darren Tucker | 2e0cf0d | 2005-02-08 21:52:47 +1100 | [diff] [blame] | 1977 | #ifdef SSH_AUDIT_EVENTS |
Darren Tucker | 269a1ea | 2005-02-03 00:20:53 +1100 | [diff] [blame] | 1978 | audit_connection_from(remote_ip, remote_port); |
| 1979 | #endif |
Damien Miller | 6a4a4b9 | 2001-11-12 11:07:11 +1100 | [diff] [blame] | 1980 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1981 | /* Log the connection. */ |
dtucker@openbsd.org | 15fdfc9 | 2015-04-15 23:23:25 +0000 | [diff] [blame] | 1982 | laddr = get_local_ipaddr(sock_in); |
Damien Miller | 5ecb416 | 2013-10-24 21:02:02 +1100 | [diff] [blame] | 1983 | verbose("Connection from %s port %d on %s port %d", |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1984 | remote_ip, remote_port, laddr, ssh_local_port(ssh)); |
dtucker@openbsd.org | 15fdfc9 | 2015-04-15 23:23:25 +0000 | [diff] [blame] | 1985 | free(laddr); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1986 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1987 | /* |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 1988 | * We don't want to listen forever unless the other side |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1989 | * successfully authenticates itself. So we set up an alarm which is |
| 1990 | * cleared after successful authentication. A limit of zero |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 1991 | * indicates no limit. Note that we don't set the alarm in debugging |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1992 | * mode; it is just annoying to have the server exit just when you |
| 1993 | * are about to discover the bug. |
| 1994 | */ |
Ben Lindstrom | 5ade9ab | 2003-08-25 01:16:21 +0000 | [diff] [blame] | 1995 | signal(SIGALRM, grace_alarm_handler); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1996 | if (!debug_flag) |
| 1997 | alarm(options.login_grace_time); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1998 | |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1999 | sshd_exchange_identification(ssh, sock_in, sock_out); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2000 | packet_set_nonblocking(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2001 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2002 | /* allocate authentication context */ |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 2003 | authctxt = xcalloc(1, sizeof(*authctxt)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2004 | |
Darren Tucker | f3bb434 | 2005-03-31 21:39:25 +1000 | [diff] [blame] | 2005 | authctxt->loginmsg = &loginmsg; |
| 2006 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2007 | /* XXX global for cleanup, access from other modules */ |
| 2008 | the_authctxt = authctxt; |
| 2009 | |
Darren Tucker | 5c14c73 | 2005-01-24 21:55:49 +1100 | [diff] [blame] | 2010 | /* prepare buffer to collect messages to display to user after login */ |
| 2011 | buffer_init(&loginmsg); |
Darren Tucker | cd70e1b | 2010-03-07 23:05:17 +1100 | [diff] [blame] | 2012 | auth_debug_reset(); |
Darren Tucker | 5c14c73 | 2005-01-24 21:55:49 +1100 | [diff] [blame] | 2013 | |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 2014 | if (use_privsep) { |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2015 | if (privsep_preauth(authctxt) == 1) |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 2016 | goto authenticated; |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 2017 | } else if (have_agent) { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 2018 | if ((r = ssh_get_authentication_socket(&auth_sock)) != 0) { |
| 2019 | error("Unable to get agent socket: %s", ssh_err(r)); |
djm@openbsd.org | 83f8ffa | 2015-01-17 18:53:34 +0000 | [diff] [blame] | 2020 | have_agent = 0; |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 2021 | } |
| 2022 | } |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2023 | |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 2024 | /* perform the key exchange */ |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 2025 | /* authenticate user and start session */ |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 2026 | do_ssh2_kex(); |
| 2027 | do_authentication2(authctxt); |
| 2028 | |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 2029 | /* |
| 2030 | * If we use privilege separation, the unprivileged child transfers |
| 2031 | * the current keystate and exits |
| 2032 | */ |
| 2033 | if (use_privsep) { |
Ben Lindstrom | 7339b2a | 2002-05-15 16:25:01 +0000 | [diff] [blame] | 2034 | mm_send_keystate(pmonitor); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2035 | exit(0); |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 2036 | } |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2037 | |
| 2038 | authenticated: |
Damien Miller | 7bff1a9 | 2005-12-24 14:59:12 +1100 | [diff] [blame] | 2039 | /* |
| 2040 | * Cancel the alarm we set to limit the time taken for |
| 2041 | * authentication. |
| 2042 | */ |
| 2043 | alarm(0); |
| 2044 | signal(SIGALRM, SIG_DFL); |
Damien Miller | 3f8123c | 2006-08-19 00:32:46 +1000 | [diff] [blame] | 2045 | authctxt->authenticated = 1; |
Damien Miller | 7bff1a9 | 2005-12-24 14:59:12 +1100 | [diff] [blame] | 2046 | if (startup_pipe != -1) { |
| 2047 | close(startup_pipe); |
| 2048 | startup_pipe = -1; |
| 2049 | } |
| 2050 | |
Darren Tucker | 2e0cf0d | 2005-02-08 21:52:47 +1100 | [diff] [blame] | 2051 | #ifdef SSH_AUDIT_EVENTS |
| 2052 | audit_event(SSH_AUTH_SUCCESS); |
Darren Tucker | 269a1ea | 2005-02-03 00:20:53 +1100 | [diff] [blame] | 2053 | #endif |
| 2054 | |
Darren Tucker | 52358d6 | 2008-03-11 22:58:25 +1100 | [diff] [blame] | 2055 | #ifdef GSSAPI |
| 2056 | if (options.gss_authentication) { |
| 2057 | temporarily_use_uid(authctxt->pw); |
| 2058 | ssh_gssapi_storecreds(); |
| 2059 | restore_uid(); |
| 2060 | } |
| 2061 | #endif |
| 2062 | #ifdef USE_PAM |
| 2063 | if (options.use_pam) { |
| 2064 | do_pam_setcred(1); |
| 2065 | do_pam_session(); |
| 2066 | } |
| 2067 | #endif |
| 2068 | |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 2069 | /* |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2070 | * In privilege separation, we fork another child and prepare |
| 2071 | * file descriptor passing. |
| 2072 | */ |
| 2073 | if (use_privsep) { |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 2074 | privsep_postauth(authctxt); |
| 2075 | /* the monitor process [priv] will not return */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2076 | } |
Ben Lindstrom | 73ab9ba | 2002-03-22 01:27:35 +0000 | [diff] [blame] | 2077 | |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 2078 | packet_set_timeout(options.client_alive_interval, |
| 2079 | options.client_alive_count_max); |
| 2080 | |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 2081 | /* Try to send all our hostkeys to the client */ |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 2082 | notify_hostkeys(active_state); |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 2083 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2084 | /* Start session. */ |
Ben Lindstrom | 73ab9ba | 2002-03-22 01:27:35 +0000 | [diff] [blame] | 2085 | do_authenticated(authctxt); |
| 2086 | |
Damien Miller | 3a5b023 | 2002-03-13 13:19:42 +1100 | [diff] [blame] | 2087 | /* The connection has been terminated. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2088 | packet_get_bytes(&ibytes, &obytes); |
Damien Miller | 821de0a | 2011-01-11 17:20:29 +1100 | [diff] [blame] | 2089 | verbose("Transferred: sent %llu, received %llu bytes", |
| 2090 | (unsigned long long)obytes, (unsigned long long)ibytes); |
Damien Miller | b61f3fc | 2008-07-11 17:36:48 +1000 | [diff] [blame] | 2091 | |
| 2092 | verbose("Closing connection to %.500s port %d", remote_ip, remote_port); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2093 | |
Damien Miller | beb4ba5 | 1999-12-28 15:09:35 +1100 | [diff] [blame] | 2094 | #ifdef USE_PAM |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 2095 | if (options.use_pam) |
| 2096 | finish_pam(); |
Damien Miller | beb4ba5 | 1999-12-28 15:09:35 +1100 | [diff] [blame] | 2097 | #endif /* USE_PAM */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2098 | |
Darren Tucker | 2b59a6d | 2005-03-06 22:38:51 +1100 | [diff] [blame] | 2099 | #ifdef SSH_AUDIT_EVENTS |
| 2100 | PRIVSEP(audit_event(SSH_CONNECTION_CLOSE)); |
| 2101 | #endif |
| 2102 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2103 | packet_close(); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2104 | |
| 2105 | if (use_privsep) |
| 2106 | mm_terminate(); |
| 2107 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2108 | exit(0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2109 | } |
| 2110 | |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 2111 | int |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame^] | 2112 | sshd_hostkey_sign(struct sshkey *privkey, struct sshkey *pubkey, |
| 2113 | u_char **signature, size_t *slen, const u_char *data, size_t dlen, |
| 2114 | const char *alg, u_int flag) |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 2115 | { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 2116 | int r; |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 2117 | u_int xxx_slen, xxx_dlen = dlen; |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 2118 | |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 2119 | if (privkey) { |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 2120 | if (PRIVSEP(key_sign(privkey, signature, &xxx_slen, data, xxx_dlen, |
| 2121 | alg) < 0)) |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 2122 | fatal("%s: key_sign failed", __func__); |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 2123 | if (slen) |
| 2124 | *slen = xxx_slen; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 2125 | } else if (use_privsep) { |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 2126 | if (mm_key_sign(pubkey, signature, &xxx_slen, data, xxx_dlen, |
| 2127 | alg) < 0) |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 2128 | fatal("%s: pubkey_sign failed", __func__); |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 2129 | if (slen) |
| 2130 | *slen = xxx_slen; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 2131 | } else { |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 2132 | if ((r = ssh_agent_sign(auth_sock, pubkey, signature, slen, |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 2133 | data, dlen, alg, datafellows)) != 0) |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 2134 | fatal("%s: ssh_agent_sign failed: %s", |
| 2135 | __func__, ssh_err(r)); |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 2136 | } |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 2137 | return 0; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 2138 | } |
| 2139 | |
djm@openbsd.org | bdfd29f | 2015-07-03 03:47:00 +0000 | [diff] [blame] | 2140 | /* SSH2 key exchange */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2141 | static void |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 2142 | do_ssh2_kex(void) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2143 | { |
Damien Miller | 9235a03 | 2014-04-20 13:17:20 +1000 | [diff] [blame] | 2144 | char *myproposal[PROPOSAL_MAX] = { KEX_SERVER }; |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 2145 | struct kex *kex; |
markus@openbsd.org | 57e783c | 2015-01-20 20:16:21 +0000 | [diff] [blame] | 2146 | int r; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2147 | |
djm@openbsd.org | f9eca24 | 2015-07-30 00:01:34 +0000 | [diff] [blame] | 2148 | myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal( |
| 2149 | options.kex_algorithms); |
| 2150 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = compat_cipher_proposal( |
| 2151 | options.ciphers); |
| 2152 | myproposal[PROPOSAL_ENC_ALGS_STOC] = compat_cipher_proposal( |
| 2153 | options.ciphers); |
| 2154 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = |
| 2155 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; |
Damien Miller | a0ff466 | 2001-03-30 10:49:35 +1000 | [diff] [blame] | 2156 | |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 2157 | if (options.compression == COMP_NONE) { |
Ben Lindstrom | 23e0f66 | 2002-06-21 01:09:47 +0000 | [diff] [blame] | 2158 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
dtucker@openbsd.org | 8c02e36 | 2016-05-24 04:43:45 +0000 | [diff] [blame] | 2159 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none"; |
Ben Lindstrom | 23e0f66 | 2002-06-21 01:09:47 +0000 | [diff] [blame] | 2160 | } |
Damien Miller | 9395b28 | 2014-04-20 13:25:30 +1000 | [diff] [blame] | 2161 | |
Darren Tucker | 5f96f3b | 2013-05-16 20:29:28 +1000 | [diff] [blame] | 2162 | if (options.rekey_limit || options.rekey_interval) |
dtucker@openbsd.org | 921ff00 | 2016-01-29 02:54:45 +0000 | [diff] [blame] | 2163 | packet_set_rekey_limits(options.rekey_limit, |
dtucker@openbsd.org | c998bf0 | 2017-02-03 02:56:00 +0000 | [diff] [blame] | 2164 | options.rekey_interval); |
Darren Tucker | 5f96f3b | 2013-05-16 20:29:28 +1000 | [diff] [blame] | 2165 | |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 2166 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = compat_pkalg_proposal( |
| 2167 | list_hostkey_types()); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2168 | |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 2169 | /* start key exchange */ |
markus@openbsd.org | 57e783c | 2015-01-20 20:16:21 +0000 | [diff] [blame] | 2170 | if ((r = kex_setup(active_state, myproposal)) != 0) |
| 2171 | fatal("kex_setup: %s", ssh_err(r)); |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 2172 | kex = active_state->kex; |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 2173 | #ifdef WITH_OPENSSL |
Damien Miller | 8e7fb33 | 2003-02-24 12:03:03 +1100 | [diff] [blame] | 2174 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
Damien Miller | f675fc4 | 2004-06-15 10:30:09 +1000 | [diff] [blame] | 2175 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; |
djm@openbsd.org | 0e8eeec | 2016-05-02 10:26:04 +0000 | [diff] [blame] | 2176 | kex->kex[KEX_DH_GRP14_SHA256] = kexdh_server; |
| 2177 | kex->kex[KEX_DH_GRP16_SHA512] = kexdh_server; |
| 2178 | kex->kex[KEX_DH_GRP18_SHA512] = kexdh_server; |
Damien Miller | 8e7fb33 | 2003-02-24 12:03:03 +1100 | [diff] [blame] | 2179 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
Damien Miller | a63128d | 2006-03-15 12:08:28 +1100 | [diff] [blame] | 2180 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; |
Darren Tucker | f2004cd | 2015-02-23 05:04:21 +1100 | [diff] [blame] | 2181 | # ifdef OPENSSL_HAS_ECC |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 2182 | kex->kex[KEX_ECDH_SHA2] = kexecdh_server; |
Darren Tucker | f2004cd | 2015-02-23 05:04:21 +1100 | [diff] [blame] | 2183 | # endif |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 2184 | #endif |
Damien Miller | 1e12426 | 2013-11-04 08:26:52 +1100 | [diff] [blame] | 2185 | kex->kex[KEX_C25519_SHA256] = kexc25519_server; |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 2186 | kex->server = 1; |
| 2187 | kex->client_version_string=client_version_string; |
| 2188 | kex->server_version_string=server_version_string; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 2189 | kex->load_host_public_key=&get_hostkey_public_by_type; |
| 2190 | kex->load_host_private_key=&get_hostkey_private_by_type; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2191 | kex->host_key_index=&get_hostkey_index; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 2192 | kex->sign = sshd_hostkey_sign; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2193 | |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 2194 | dispatch_run(DISPATCH_BLOCK, &kex->done, active_state); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 2195 | |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 2196 | session_id2 = kex->session_id; |
| 2197 | session_id2_len = kex->session_id_len; |
| 2198 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 2199 | #ifdef DEBUG_KEXDH |
| 2200 | /* send 1st encrypted/maced/compressed message */ |
| 2201 | packet_start(SSH2_MSG_IGNORE); |
| 2202 | packet_put_cstring("markus"); |
| 2203 | packet_send(); |
| 2204 | packet_write_wait(); |
| 2205 | #endif |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 2206 | debug("KEX done"); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2207 | } |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2208 | |
| 2209 | /* server specific fatal cleanup */ |
| 2210 | void |
| 2211 | cleanup_exit(int i) |
| 2212 | { |
Damien Miller | 9ee2c60 | 2011-09-22 21:38:30 +1000 | [diff] [blame] | 2213 | if (the_authctxt) { |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2214 | do_cleanup(the_authctxt); |
Damien Miller | 75c6272 | 2014-04-20 13:24:31 +1000 | [diff] [blame] | 2215 | if (use_privsep && privsep_is_preauth && |
| 2216 | pmonitor != NULL && pmonitor->m_pid > 1) { |
Damien Miller | 9ee2c60 | 2011-09-22 21:38:30 +1000 | [diff] [blame] | 2217 | debug("Killing privsep child %d", pmonitor->m_pid); |
| 2218 | if (kill(pmonitor->m_pid, SIGKILL) != 0 && |
Darren Tucker | 2e13560 | 2011-10-02 19:10:13 +1100 | [diff] [blame] | 2219 | errno != ESRCH) |
Damien Miller | 9ee2c60 | 2011-09-22 21:38:30 +1000 | [diff] [blame] | 2220 | error("%s: kill(%d): %s", __func__, |
| 2221 | pmonitor->m_pid, strerror(errno)); |
| 2222 | } |
| 2223 | } |
Darren Tucker | 2e0cf0d | 2005-02-08 21:52:47 +1100 | [diff] [blame] | 2224 | #ifdef SSH_AUDIT_EVENTS |
Darren Tucker | 269a1ea | 2005-02-03 00:20:53 +1100 | [diff] [blame] | 2225 | /* done after do_cleanup so it can cancel the PAM auth 'thread' */ |
| 2226 | if (!use_privsep || mm_is_monitor()) |
Darren Tucker | 2e0cf0d | 2005-02-08 21:52:47 +1100 | [diff] [blame] | 2227 | audit_event(SSH_CONNECTION_ABANDON); |
Darren Tucker | 269a1ea | 2005-02-03 00:20:53 +1100 | [diff] [blame] | 2228 | #endif |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2229 | _exit(i); |
| 2230 | } |