djm@openbsd.org | a8c05c6 | 2020-01-24 23:56:01 +0000 | [diff] [blame] | 1 | /* $OpenBSD: sshd.c,v 1.545 2020/01/24 23:56:01 djm 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" |
Ben Lindstrom | d95c09c | 2001-02-18 19:13:33 +0000 | [diff] [blame] | 91 | #include "sshpty.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 92 | #include "packet.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 93 | #include "log.h" |
markus@openbsd.org | c3cb779 | 2018-07-09 21:29:36 +0000 | [diff] [blame] | 94 | #include "sshbuf.h" |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 95 | #include "misc.h" |
markus@openbsd.org | 3a1638d | 2015-07-10 06:21:53 +0000 | [diff] [blame] | 96 | #include "match.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 97 | #include "servconf.h" |
| 98 | #include "uidswap.h" |
| 99 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 100 | #include "cipher.h" |
Damien Miller | 4a1c7aa | 2014-02-04 11:03:36 +1100 | [diff] [blame] | 101 | #include "digest.h" |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 102 | #include "sshkey.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 103 | #include "kex.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 104 | #include "myproposal.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 105 | #include "authfile.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 106 | #include "pathnames.h" |
| 107 | #include "atomicio.h" |
| 108 | #include "canohost.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 109 | #include "hostfile.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 110 | #include "auth.h" |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 111 | #include "authfd.h" |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 112 | #include "msg.h" |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 113 | #include "dispatch.h" |
Ben Lindstrom | 1bae404 | 2001-10-03 17:46:39 +0000 | [diff] [blame] | 114 | #include "channels.h" |
Ben Lindstrom | 73ab9ba | 2002-03-22 01:27:35 +0000 | [diff] [blame] | 115 | #include "session.h" |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 116 | #include "monitor.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 117 | #ifdef GSSAPI |
| 118 | #include "ssh-gss.h" |
| 119 | #endif |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 120 | #include "monitor_wrap.h" |
Damien Miller | dcbd41e | 2011-06-23 19:45:51 +1000 | [diff] [blame] | 121 | #include "ssh-sandbox.h" |
djm@openbsd.org | 7c85685 | 2018-03-03 03:15:51 +0000 | [diff] [blame] | 122 | #include "auth-options.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" |
djm@openbsd.org | 56584cc | 2019-12-15 18:57:30 +0000 | [diff] [blame] | 125 | #include "sk-api.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 126 | |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 127 | /* Re-exec fds */ |
| 128 | #define REEXEC_DEVCRYPTO_RESERVED_FD (STDERR_FILENO + 1) |
| 129 | #define REEXEC_STARTUP_PIPE_FD (STDERR_FILENO + 2) |
| 130 | #define REEXEC_CONFIG_PASS_FD (STDERR_FILENO + 3) |
| 131 | #define REEXEC_MIN_FREE_FD (STDERR_FILENO + 4) |
| 132 | |
Ben Lindstrom | 49a79c0 | 2000-11-17 03:47:20 +0000 | [diff] [blame] | 133 | extern char *__progname; |
Ben Lindstrom | 49a79c0 | 2000-11-17 03:47:20 +0000 | [diff] [blame] | 134 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 135 | /* Server configuration options. */ |
| 136 | ServerOptions options; |
| 137 | |
| 138 | /* Name of the server configuration file. */ |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 139 | char *config_file_name = _PATH_SERVER_CONFIG_FILE; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 140 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 141 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 142 | * Debug mode flag. This can be set on the command line. If debug |
| 143 | * mode is enabled, extra debugging output will be sent to the system |
| 144 | * log, the daemon will not go to background, and will exit after processing |
| 145 | * the first connection. |
| 146 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 147 | int debug_flag = 0; |
| 148 | |
djm@openbsd.org@openbsd.org | 548d3a6 | 2017-11-14 00:45:29 +0000 | [diff] [blame] | 149 | /* |
| 150 | * Indicating that the daemon should only test the configuration and keys. |
| 151 | * If test_flag > 1 ("-T" flag), then sshd will also dump the effective |
| 152 | * configuration, optionally using connection information provided by the |
| 153 | * "-C" flag. |
| 154 | */ |
djm@openbsd.org | dbb4dec | 2019-01-17 01:50:24 +0000 | [diff] [blame] | 155 | static int test_flag = 0; |
Ben Lindstrom | 794325a | 2001-08-06 21:09:07 +0000 | [diff] [blame] | 156 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 157 | /* Flag indicating that the daemon is being started from inetd. */ |
djm@openbsd.org | dbb4dec | 2019-01-17 01:50:24 +0000 | [diff] [blame] | 158 | static int inetd_flag = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 159 | |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 160 | /* Flag indicating that sshd should not detach and become a daemon. */ |
djm@openbsd.org | dbb4dec | 2019-01-17 01:50:24 +0000 | [diff] [blame] | 161 | static int no_daemon_flag = 0; |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 162 | |
Damien Miller | 5ce662a | 1999-11-11 17:57:39 +1100 | [diff] [blame] | 163 | /* debug goes to stderr unless inetd_flag is set */ |
djm@openbsd.org | dbb4dec | 2019-01-17 01:50:24 +0000 | [diff] [blame] | 164 | static int log_stderr = 0; |
Damien Miller | 5ce662a | 1999-11-11 17:57:39 +1100 | [diff] [blame] | 165 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 166 | /* Saved arguments to main(). */ |
djm@openbsd.org | dbb4dec | 2019-01-17 01:50:24 +0000 | [diff] [blame] | 167 | static char **saved_argv; |
| 168 | static int saved_argc; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 169 | |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 170 | /* re-exec */ |
djm@openbsd.org | dbb4dec | 2019-01-17 01:50:24 +0000 | [diff] [blame] | 171 | static int rexeced_flag = 0; |
| 172 | static int rexec_flag = 1; |
| 173 | static int rexec_argc = 0; |
| 174 | static char **rexec_argv; |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 175 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 176 | /* |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 177 | * The sockets that the server is listening; this is used in the SIGHUP |
| 178 | * signal handler. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 179 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 180 | #define MAX_LISTEN_SOCKS 16 |
djm@openbsd.org | dbb4dec | 2019-01-17 01:50:24 +0000 | [diff] [blame] | 181 | static int listen_socks[MAX_LISTEN_SOCKS]; |
| 182 | static int num_listen_socks = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 183 | |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 184 | /* Daemon's agent connection */ |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 185 | int auth_sock = -1; |
djm@openbsd.org | dbb4dec | 2019-01-17 01:50:24 +0000 | [diff] [blame] | 186 | static int have_agent = 0; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 187 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 188 | /* |
| 189 | * Any really sensitive data in the application is contained in this |
| 190 | * structure. The idea is that this structure could be locked into memory so |
| 191 | * that the pages do not get written into swap. However, there are some |
| 192 | * problems. The private key contains BIGNUMs, and we do not (in principle) |
| 193 | * have access to the internals of them, and locking just the structure is |
| 194 | * not very useful. Currently, memory locking is not implemented. |
| 195 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 196 | struct { |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 197 | struct sshkey **host_keys; /* all private host keys */ |
| 198 | struct sshkey **host_pubkeys; /* all public host keys */ |
| 199 | struct sshkey **host_certificates; /* all public host certificates */ |
| 200 | int have_ssh2_key; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 201 | } sensitive_data; |
| 202 | |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 203 | /* This is set to true when a signal is received. */ |
Ben Lindstrom | 5e71c54 | 2001-12-06 16:48:14 +0000 | [diff] [blame] | 204 | static volatile sig_atomic_t received_sighup = 0; |
| 205 | static volatile sig_atomic_t received_sigterm = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 206 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 207 | /* session identifier, used by RSA-auth */ |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 208 | u_char session_id[16]; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 209 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 210 | /* same for ssh2 */ |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 211 | u_char *session_id2 = NULL; |
Darren Tucker | 502d384 | 2003-06-28 12:38:01 +1000 | [diff] [blame] | 212 | u_int session_id2_len = 0; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 213 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 214 | /* record remote hostname or ip */ |
deraadt@openbsd.org | 087266e | 2015-01-20 23:14:00 +0000 | [diff] [blame] | 215 | u_int utmp_len = HOST_NAME_MAX+1; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 216 | |
djm@openbsd.org | 76a24b3 | 2019-03-01 02:32:39 +0000 | [diff] [blame] | 217 | /* |
| 218 | * startup_pipes/flags are used for tracking children of the listening sshd |
| 219 | * process early in their lifespans. This tracking is needed for three things: |
| 220 | * |
| 221 | * 1) Implementing the MaxStartups limit of concurrent unauthenticated |
| 222 | * connections. |
| 223 | * 2) Avoiding a race condition for SIGHUP processing, where child processes |
| 224 | * may have listen_socks open that could collide with main listener process |
| 225 | * after it restarts. |
| 226 | * 3) Ensuring that rexec'd sshd processes have received their initial state |
| 227 | * from the parent listen process before handling SIGHUP. |
| 228 | * |
| 229 | * Child processes signal that they have completed closure of the listen_socks |
| 230 | * and (if applicable) received their rexec state by sending a char over their |
| 231 | * sock. Child processes signal that authentication has completed by closing |
| 232 | * the sock (or by exiting). |
| 233 | */ |
djm@openbsd.org | dbb4dec | 2019-01-17 01:50:24 +0000 | [diff] [blame] | 234 | static int *startup_pipes = NULL; |
djm@openbsd.org | 76a24b3 | 2019-03-01 02:32:39 +0000 | [diff] [blame] | 235 | static int *startup_flags = NULL; /* Indicates child closed listener */ |
| 236 | static int startup_pipe = -1; /* in child */ |
Ben Lindstrom | d84df98 | 2001-12-06 16:35:40 +0000 | [diff] [blame] | 237 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 238 | /* variables used for privilege separation */ |
Darren Tucker | 4515047 | 2006-07-12 22:34:17 +1000 | [diff] [blame] | 239 | int use_privsep = -1; |
Darren Tucker | a8be9e2 | 2004-02-06 16:40:27 +1100 | [diff] [blame] | 240 | struct monitor *pmonitor = NULL; |
Damien Miller | 9ee2c60 | 2011-09-22 21:38:30 +1000 | [diff] [blame] | 241 | int privsep_is_preauth = 1; |
Darren Tucker | d13281f | 2017-03-29 12:39:39 +1100 | [diff] [blame] | 242 | static int privsep_chroot = 1; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 243 | |
djm@openbsd.org | 04c091f | 2019-01-19 21:43:56 +0000 | [diff] [blame] | 244 | /* global connection state and authentication contexts */ |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 245 | Authctxt *the_authctxt = NULL; |
djm@openbsd.org | 04c091f | 2019-01-19 21:43:56 +0000 | [diff] [blame] | 246 | struct ssh *the_active_state; |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 247 | |
djm@openbsd.org | 7c85685 | 2018-03-03 03:15:51 +0000 | [diff] [blame] | 248 | /* global key/cert auth options. XXX move to permanent ssh->authctxt? */ |
| 249 | struct sshauthopt *auth_opts = NULL; |
| 250 | |
Darren Tucker | 4515047 | 2006-07-12 22:34:17 +1000 | [diff] [blame] | 251 | /* sshd_config buffer */ |
markus@openbsd.org | c3cb779 | 2018-07-09 21:29:36 +0000 | [diff] [blame] | 252 | struct sshbuf *cfg; |
Darren Tucker | 4515047 | 2006-07-12 22:34:17 +1000 | [diff] [blame] | 253 | |
Darren Tucker | 0999174 | 2004-07-17 17:05:14 +1000 | [diff] [blame] | 254 | /* message to be displayed after login */ |
markus@openbsd.org | 2808d18 | 2018-07-09 21:26:02 +0000 | [diff] [blame] | 255 | struct sshbuf *loginmsg; |
Darren Tucker | 0999174 | 2004-07-17 17:05:14 +1000 | [diff] [blame] | 256 | |
Damien Miller | 6433df0 | 2006-09-07 10:36:43 +1000 | [diff] [blame] | 257 | /* Unprivileged user */ |
| 258 | struct passwd *privsep_pw = NULL; |
| 259 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 260 | /* Prototypes for various functions defined later in this file. */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 261 | void destroy_sensitive_data(void); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 262 | void demote_sensitive_data(void); |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 263 | static void do_ssh2_kex(struct ssh *); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 264 | |
djm@openbsd.org | a8c05c6 | 2020-01-24 23:56:01 +0000 | [diff] [blame] | 265 | static char *listener_proctitle; |
| 266 | |
Damien Miller | 98c7ad6 | 2000-03-09 21:27:49 +1100 | [diff] [blame] | 267 | /* |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 268 | * Close all listening sockets |
| 269 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 270 | static void |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 271 | close_listen_socks(void) |
| 272 | { |
| 273 | int i; |
Ben Lindstrom | 822b634 | 2002-06-23 21:38:49 +0000 | [diff] [blame] | 274 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 275 | for (i = 0; i < num_listen_socks; i++) |
| 276 | close(listen_socks[i]); |
| 277 | num_listen_socks = -1; |
| 278 | } |
| 279 | |
Ben Lindstrom | d84df98 | 2001-12-06 16:35:40 +0000 | [diff] [blame] | 280 | static void |
| 281 | close_startup_pipes(void) |
| 282 | { |
| 283 | int i; |
Ben Lindstrom | 822b634 | 2002-06-23 21:38:49 +0000 | [diff] [blame] | 284 | |
Ben Lindstrom | d84df98 | 2001-12-06 16:35:40 +0000 | [diff] [blame] | 285 | if (startup_pipes) |
| 286 | for (i = 0; i < options.max_startups; i++) |
| 287 | if (startup_pipes[i] != -1) |
| 288 | close(startup_pipes[i]); |
| 289 | } |
| 290 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 291 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 292 | * Signal handler for SIGHUP. Sshd execs itself when it receives SIGHUP; |
| 293 | * the effect is to reread the configuration file (and to regenerate |
| 294 | * the server key). |
| 295 | */ |
Damien Miller | f0b15df | 2006-03-26 13:59:20 +1100 | [diff] [blame] | 296 | |
| 297 | /*ARGSUSED*/ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 298 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 299 | sighup_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 300 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 301 | received_sighup = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 302 | } |
| 303 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 304 | /* |
| 305 | * Called from the main program after receiving SIGHUP. |
| 306 | * Restarts the server. |
| 307 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 308 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 309 | sighup_restart(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 310 | { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 311 | logit("Received SIGHUP; restarting."); |
dtucker@openbsd.org | f2398eb | 2016-12-04 22:27:25 +0000 | [diff] [blame] | 312 | if (options.pid_file != NULL) |
| 313 | unlink(options.pid_file); |
Darren Tucker | f2bf36c | 2013-09-22 19:02:40 +1000 | [diff] [blame] | 314 | platform_pre_restart(); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 315 | close_listen_socks(); |
Ben Lindstrom | d84df98 | 2001-12-06 16:35:40 +0000 | [diff] [blame] | 316 | close_startup_pipes(); |
Darren Tucker | ed62396 | 2007-02-25 20:37:21 +1100 | [diff] [blame] | 317 | alarm(0); /* alarm timer persists across exec */ |
dtucker@openbsd.org | 3bf2a6a | 2020-01-23 07:10:22 +0000 | [diff] [blame] | 318 | ssh_signal(SIGHUP, SIG_IGN); /* will be restored after exec */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 319 | execv(saved_argv[0], saved_argv); |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 320 | logit("RESTART FAILED: av[0]='%.100s', error: %.100s.", saved_argv[0], |
Ben Lindstrom | 822b634 | 2002-06-23 21:38:49 +0000 | [diff] [blame] | 321 | strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 322 | exit(1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 323 | } |
| 324 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 325 | /* |
| 326 | * Generic signal handler for terminating signals in the master daemon. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 327 | */ |
Damien Miller | f0b15df | 2006-03-26 13:59:20 +1100 | [diff] [blame] | 328 | /*ARGSUSED*/ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 329 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 330 | sigterm_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 331 | { |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 332 | received_sigterm = sig; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 333 | } |
| 334 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 335 | /* |
| 336 | * SIGCHLD handler. This is called whenever a child dies. This will then |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 337 | * reap any zombies left by exited children. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 338 | */ |
Damien Miller | f0b15df | 2006-03-26 13:59:20 +1100 | [diff] [blame] | 339 | /*ARGSUSED*/ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 340 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 341 | main_sigchld_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 342 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 343 | int save_errno = errno; |
Ben Lindstrom | 822b634 | 2002-06-23 21:38:49 +0000 | [diff] [blame] | 344 | pid_t pid; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 345 | int status; |
Damien Miller | 431f66b | 1999-11-21 18:31:57 +1100 | [diff] [blame] | 346 | |
dtucker@openbsd.org | 3bf2a6a | 2020-01-23 07:10:22 +0000 | [diff] [blame] | 347 | debug("main_sigchld_handler: %s", strsignal(sig)); |
| 348 | |
Ben Lindstrom | 47fd811 | 2002-04-02 20:48:19 +0000 | [diff] [blame] | 349 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 350 | (pid == -1 && errno == EINTR)) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 351 | ; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 352 | errno = save_errno; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 353 | } |
| 354 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 355 | /* |
| 356 | * Signal handler for the alarm after the login grace period has expired. |
| 357 | */ |
Damien Miller | f0b15df | 2006-03-26 13:59:20 +1100 | [diff] [blame] | 358 | /*ARGSUSED*/ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 359 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 360 | grace_alarm_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 361 | { |
Darren Tucker | a8be9e2 | 2004-02-06 16:40:27 +1100 | [diff] [blame] | 362 | if (use_privsep && pmonitor != NULL && pmonitor->m_pid > 0) |
| 363 | kill(pmonitor->m_pid, SIGALRM); |
| 364 | |
Damien Miller | 09d3e12 | 2012-10-31 08:58:58 +1100 | [diff] [blame] | 365 | /* |
| 366 | * Try to kill any processes that we have spawned, E.g. authorized |
| 367 | * keys command helpers. |
| 368 | */ |
| 369 | if (getpgid(0) == getpid()) { |
dtucker@openbsd.org | 3bf2a6a | 2020-01-23 07:10:22 +0000 | [diff] [blame] | 370 | ssh_signal(SIGTERM, SIG_IGN); |
Damien Miller | ab16ef4 | 2014-01-28 15:08:12 +1100 | [diff] [blame] | 371 | kill(0, SIGTERM); |
Damien Miller | 09d3e12 | 2012-10-31 08:58:58 +1100 | [diff] [blame] | 372 | } |
| 373 | |
djm@openbsd.org | 04c091f | 2019-01-19 21:43:56 +0000 | [diff] [blame] | 374 | /* XXX pre-format ipaddr/port so we don't need to access active_state */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 375 | /* Log error and exit. */ |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 376 | sigdie("Timeout before authentication for %s port %d", |
djm@openbsd.org | 04c091f | 2019-01-19 21:43:56 +0000 | [diff] [blame] | 377 | ssh_remote_ipaddr(the_active_state), |
| 378 | ssh_remote_port(the_active_state)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 379 | } |
| 380 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 381 | /* Destroy the host and server keys. They will no longer be needed. */ |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 382 | void |
| 383 | destroy_sensitive_data(void) |
| 384 | { |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 385 | u_int i; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 386 | |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 387 | for (i = 0; i < options.num_host_key_files; i++) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 388 | if (sensitive_data.host_keys[i]) { |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 389 | sshkey_free(sensitive_data.host_keys[i]); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 390 | sensitive_data.host_keys[i] = NULL; |
| 391 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 392 | if (sensitive_data.host_certificates[i]) { |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 393 | sshkey_free(sensitive_data.host_certificates[i]); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 394 | sensitive_data.host_certificates[i] = NULL; |
| 395 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 396 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 397 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 398 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 399 | /* Demote private to public keys for network child */ |
| 400 | void |
| 401 | demote_sensitive_data(void) |
| 402 | { |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 403 | struct sshkey *tmp; |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 404 | u_int i; |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 405 | int r; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 406 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 407 | for (i = 0; i < options.num_host_key_files; i++) { |
| 408 | if (sensitive_data.host_keys[i]) { |
djm@openbsd.org | 482d23b | 2018-09-13 02:08:33 +0000 | [diff] [blame] | 409 | if ((r = sshkey_from_private( |
| 410 | sensitive_data.host_keys[i], &tmp)) != 0) |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 411 | fatal("could not demote host %s key: %s", |
| 412 | sshkey_type(sensitive_data.host_keys[i]), |
| 413 | ssh_err(r)); |
| 414 | sshkey_free(sensitive_data.host_keys[i]); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 415 | sensitive_data.host_keys[i] = tmp; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 416 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 417 | /* Certs do not need demotion */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 418 | } |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 419 | } |
| 420 | |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 421 | static void |
Damien Miller | c9f880c | 2016-11-30 13:51:49 +1100 | [diff] [blame] | 422 | reseed_prngs(void) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 423 | { |
Darren Tucker | 64cee36 | 2009-06-21 20:26:17 +1000 | [diff] [blame] | 424 | u_int32_t rnd[256]; |
Damien Miller | c9f880c | 2016-11-30 13:51:49 +1100 | [diff] [blame] | 425 | |
| 426 | #ifdef WITH_OPENSSL |
| 427 | RAND_poll(); |
| 428 | #endif |
| 429 | arc4random_stir(); /* noop on recent arc4random() implementations */ |
| 430 | arc4random_buf(rnd, sizeof(rnd)); /* let arc4random notice PID change */ |
| 431 | |
| 432 | #ifdef WITH_OPENSSL |
| 433 | RAND_seed(rnd, sizeof(rnd)); |
| 434 | /* give libcrypto a chance to notice the PID change */ |
| 435 | if ((RAND_bytes((u_char *)rnd, 1)) != 1) |
| 436 | fatal("%s: RAND_bytes failed", __func__); |
| 437 | #endif |
| 438 | |
| 439 | explicit_bzero(rnd, sizeof(rnd)); |
| 440 | } |
| 441 | |
| 442 | static void |
| 443 | privsep_preauth_child(void) |
| 444 | { |
Ben Lindstrom | 810af96 | 2002-07-04 00:11:40 +0000 | [diff] [blame] | 445 | gid_t gidset[1]; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 446 | |
| 447 | /* Enable challenge-response authentication for privilege separation */ |
| 448 | privsep_challenge_enable(); |
| 449 | |
Damien Miller | fb3423b | 2014-02-27 10:20:07 +1100 | [diff] [blame] | 450 | #ifdef GSSAPI |
Damien Miller | e6a74ae | 2014-02-27 10:17:49 +1100 | [diff] [blame] | 451 | /* Cache supported mechanism OIDs for later use */ |
djm@openbsd.org | cb24d9f | 2018-09-21 12:23:17 +0000 | [diff] [blame] | 452 | ssh_gssapi_prepare_supported_oids(); |
Damien Miller | fb3423b | 2014-02-27 10:20:07 +1100 | [diff] [blame] | 453 | #endif |
Damien Miller | e6a74ae | 2014-02-27 10:17:49 +1100 | [diff] [blame] | 454 | |
Damien Miller | c9f880c | 2016-11-30 13:51:49 +1100 | [diff] [blame] | 455 | reseed_prngs(); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 456 | |
| 457 | /* Demote the private keys to public keys. */ |
| 458 | demote_sensitive_data(); |
| 459 | |
djm@openbsd.org | 5b4010d | 2015-11-16 22:51:05 +0000 | [diff] [blame] | 460 | /* Demote the child */ |
Darren Tucker | d13281f | 2017-03-29 12:39:39 +1100 | [diff] [blame] | 461 | if (privsep_chroot) { |
djm@openbsd.org | 5b4010d | 2015-11-16 22:51:05 +0000 | [diff] [blame] | 462 | /* Change our root directory */ |
| 463 | if (chroot(_PATH_PRIVSEP_CHROOT_DIR) == -1) |
| 464 | fatal("chroot(\"%s\"): %s", _PATH_PRIVSEP_CHROOT_DIR, |
| 465 | strerror(errno)); |
| 466 | if (chdir("/") == -1) |
| 467 | fatal("chdir(\"/\"): %s", strerror(errno)); |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 468 | |
djm@openbsd.org | 5b4010d | 2015-11-16 22:51:05 +0000 | [diff] [blame] | 469 | /* Drop our privileges */ |
| 470 | debug3("privsep user:group %u:%u", (u_int)privsep_pw->pw_uid, |
| 471 | (u_int)privsep_pw->pw_gid); |
| 472 | gidset[0] = privsep_pw->pw_gid; |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 473 | if (setgroups(1, gidset) == -1) |
djm@openbsd.org | 5b4010d | 2015-11-16 22:51:05 +0000 | [diff] [blame] | 474 | fatal("setgroups: %.100s", strerror(errno)); |
| 475 | permanently_set_uid(privsep_pw); |
| 476 | } |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 477 | } |
| 478 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 479 | static int |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 480 | privsep_preauth(struct ssh *ssh) |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 481 | { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 482 | int status, r; |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 483 | pid_t pid; |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 484 | struct ssh_sandbox *box = NULL; |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 485 | |
| 486 | /* Set up unprivileged child process to deal with network data */ |
Ben Lindstrom | 7339b2a | 2002-05-15 16:25:01 +0000 | [diff] [blame] | 487 | pmonitor = monitor_init(); |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 488 | /* Store a pointer to the kex for later rekeying */ |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 489 | pmonitor->m_pkex = &ssh->kex; |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 490 | |
Damien Miller | 5a5c2b9 | 2012-07-31 12:21:34 +1000 | [diff] [blame] | 491 | if (use_privsep == PRIVSEP_ON) |
Damien Miller | 868ea1e | 2014-01-17 16:47:04 +1100 | [diff] [blame] | 492 | box = ssh_sandbox_init(pmonitor); |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 493 | pid = fork(); |
| 494 | if (pid == -1) { |
| 495 | fatal("fork of unprivileged child failed"); |
| 496 | } else if (pid != 0) { |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 497 | debug2("Network child is on pid %ld", (long)pid); |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 498 | |
Darren Tucker | 3b4b2d3 | 2012-07-02 18:54:31 +1000 | [diff] [blame] | 499 | pmonitor->m_pid = pid; |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 500 | if (have_agent) { |
| 501 | r = ssh_get_authentication_socket(&auth_sock); |
| 502 | if (r != 0) { |
| 503 | error("Could not get agent socket: %s", |
| 504 | ssh_err(r)); |
| 505 | have_agent = 0; |
| 506 | } |
| 507 | } |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 508 | if (box != NULL) |
| 509 | ssh_sandbox_parent_preauth(box, pid); |
djm@openbsd.org | ec00f91 | 2019-01-19 21:43:07 +0000 | [diff] [blame] | 510 | monitor_child_preauth(ssh, pmonitor); |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 511 | |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 512 | /* Wait for the child's exit status */ |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 513 | while (waitpid(pid, &status, 0) == -1) { |
Damien Miller | 9ee2c60 | 2011-09-22 21:38:30 +1000 | [diff] [blame] | 514 | if (errno == EINTR) |
| 515 | continue; |
| 516 | pmonitor->m_pid = -1; |
| 517 | fatal("%s: waitpid: %s", __func__, strerror(errno)); |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 518 | } |
Damien Miller | 9ee2c60 | 2011-09-22 21:38:30 +1000 | [diff] [blame] | 519 | privsep_is_preauth = 0; |
| 520 | pmonitor->m_pid = -1; |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 521 | if (WIFEXITED(status)) { |
| 522 | if (WEXITSTATUS(status) != 0) |
| 523 | fatal("%s: preauth child exited with status %d", |
| 524 | __func__, WEXITSTATUS(status)); |
| 525 | } else if (WIFSIGNALED(status)) |
| 526 | fatal("%s: preauth child terminated by signal %d", |
| 527 | __func__, WTERMSIG(status)); |
| 528 | if (box != NULL) |
| 529 | ssh_sandbox_parent_finish(box); |
| 530 | return 1; |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 531 | } else { |
| 532 | /* child */ |
Ben Lindstrom | 7339b2a | 2002-05-15 16:25:01 +0000 | [diff] [blame] | 533 | close(pmonitor->m_sendfd); |
Damien Miller | 8f0bf23 | 2011-06-20 14:42:23 +1000 | [diff] [blame] | 534 | close(pmonitor->m_log_recvfd); |
| 535 | |
| 536 | /* Arrange for logging to be sent to the monitor */ |
| 537 | set_log_handler(mm_log_handler, pmonitor); |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 538 | |
djm@openbsd.org | 5b4010d | 2015-11-16 22:51:05 +0000 | [diff] [blame] | 539 | privsep_preauth_child(); |
Ben Lindstrom | f90f58d | 2002-03-26 01:53:03 +0000 | [diff] [blame] | 540 | setproctitle("%s", "[net]"); |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 541 | if (box != NULL) |
| 542 | ssh_sandbox_child(box); |
| 543 | |
| 544 | return 0; |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 545 | } |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 546 | } |
| 547 | |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 548 | static void |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 549 | privsep_postauth(struct ssh *ssh, Authctxt *authctxt) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 550 | { |
Tim Rice | 9dd3081 | 2002-07-07 13:43:36 -0700 | [diff] [blame] | 551 | #ifdef DISABLE_FD_PASSING |
Tim Rice | 8eff319 | 2002-06-25 15:35:15 -0700 | [diff] [blame] | 552 | if (1) { |
| 553 | #else |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 554 | if (authctxt->pw->pw_uid == 0) { |
Tim Rice | 8eff319 | 2002-06-25 15:35:15 -0700 | [diff] [blame] | 555 | #endif |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 556 | /* File descriptor passing is broken or root login */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 557 | use_privsep = 0; |
Darren Tucker | 45b0142 | 2005-10-03 18:20:00 +1000 | [diff] [blame] | 558 | goto skip; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 559 | } |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 560 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 561 | /* New socket pair */ |
Ben Lindstrom | 7339b2a | 2002-05-15 16:25:01 +0000 | [diff] [blame] | 562 | monitor_reinit(pmonitor); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 563 | |
Ben Lindstrom | 7339b2a | 2002-05-15 16:25:01 +0000 | [diff] [blame] | 564 | pmonitor->m_pid = fork(); |
| 565 | if (pmonitor->m_pid == -1) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 566 | fatal("fork of unprivileged child failed"); |
Ben Lindstrom | 7339b2a | 2002-05-15 16:25:01 +0000 | [diff] [blame] | 567 | else if (pmonitor->m_pid != 0) { |
Damien Miller | b61f3fc | 2008-07-11 17:36:48 +1000 | [diff] [blame] | 568 | verbose("User child is on pid %ld", (long)pmonitor->m_pid); |
markus@openbsd.org | 2808d18 | 2018-07-09 21:26:02 +0000 | [diff] [blame] | 569 | sshbuf_reset(loginmsg); |
djm@openbsd.org | ec00f91 | 2019-01-19 21:43:07 +0000 | [diff] [blame] | 570 | monitor_clear_keystate(ssh, pmonitor); |
| 571 | monitor_child_postauth(ssh, pmonitor); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 572 | |
| 573 | /* NEVERREACHED */ |
| 574 | exit(0); |
| 575 | } |
| 576 | |
Damien Miller | 8f0bf23 | 2011-06-20 14:42:23 +1000 | [diff] [blame] | 577 | /* child */ |
| 578 | |
Ben Lindstrom | 7339b2a | 2002-05-15 16:25:01 +0000 | [diff] [blame] | 579 | close(pmonitor->m_sendfd); |
Damien Miller | 8f0bf23 | 2011-06-20 14:42:23 +1000 | [diff] [blame] | 580 | pmonitor->m_sendfd = -1; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 581 | |
| 582 | /* Demote the private keys to public keys. */ |
| 583 | demote_sensitive_data(); |
| 584 | |
Damien Miller | c9f880c | 2016-11-30 13:51:49 +1100 | [diff] [blame] | 585 | reseed_prngs(); |
Damien Miller | 76e95da | 2008-03-07 18:31:24 +1100 | [diff] [blame] | 586 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 587 | /* Drop privileges */ |
| 588 | do_setusercontext(authctxt->pw); |
| 589 | |
Darren Tucker | 45b0142 | 2005-10-03 18:20:00 +1000 | [diff] [blame] | 590 | skip: |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 591 | /* It is safe now to apply the key state */ |
djm@openbsd.org | ec00f91 | 2019-01-19 21:43:07 +0000 | [diff] [blame] | 592 | monitor_apply_keystate(ssh, pmonitor); |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 593 | |
| 594 | /* |
| 595 | * Tell the packet layer that authentication was successful, since |
| 596 | * this information is not part of the key state. |
| 597 | */ |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 598 | ssh_packet_set_authenticated(ssh); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 599 | } |
| 600 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 601 | static void |
| 602 | append_hostkey_type(struct sshbuf *b, const char *s) |
| 603 | { |
| 604 | int r; |
| 605 | |
| 606 | if (match_pattern_list(s, options.hostkeyalgorithms, 0) != 1) { |
| 607 | debug3("%s: %s key not permitted by HostkeyAlgorithms", |
| 608 | __func__, s); |
| 609 | return; |
| 610 | } |
| 611 | if ((r = sshbuf_putf(b, "%s%s", sshbuf_len(b) > 0 ? "," : "", s)) != 0) |
| 612 | fatal("%s: sshbuf_putf: %s", __func__, ssh_err(r)); |
| 613 | } |
| 614 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 615 | static char * |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 616 | list_hostkey_types(void) |
| 617 | { |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 618 | struct sshbuf *b; |
| 619 | struct sshkey *key; |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 620 | char *ret; |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 621 | u_int i; |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 622 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 623 | if ((b = sshbuf_new()) == NULL) |
| 624 | fatal("%s: sshbuf_new failed", __func__); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 625 | for (i = 0; i < options.num_host_key_files; i++) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 626 | key = sensitive_data.host_keys[i]; |
djm@openbsd.org | ce63c4b | 2015-02-16 22:30:03 +0000 | [diff] [blame] | 627 | if (key == NULL) |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 628 | key = sensitive_data.host_pubkeys[i]; |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 629 | if (key == NULL) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 630 | continue; |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 631 | switch (key->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 632 | case KEY_RSA: |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 633 | /* for RSA we also support SHA2 signatures */ |
| 634 | append_hostkey_type(b, "rsa-sha2-512"); |
| 635 | append_hostkey_type(b, "rsa-sha2-256"); |
| 636 | /* FALLTHROUGH */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 637 | case KEY_DSA: |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 638 | case KEY_ECDSA: |
Damien Miller | 5be9d9e | 2013-12-07 11:24:01 +1100 | [diff] [blame] | 639 | case KEY_ED25519: |
djm@openbsd.org | 56584cc | 2019-12-15 18:57:30 +0000 | [diff] [blame] | 640 | case KEY_ECDSA_SK: |
| 641 | case KEY_ED25519_SK: |
markus@openbsd.org | 1b11ea7 | 2018-02-23 15:58:37 +0000 | [diff] [blame] | 642 | case KEY_XMSS: |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 643 | append_hostkey_type(b, sshkey_ssh_name(key)); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 644 | break; |
| 645 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 646 | /* If the private key has a cert peer, then list that too */ |
| 647 | key = sensitive_data.host_certificates[i]; |
| 648 | if (key == NULL) |
| 649 | continue; |
| 650 | switch (key->type) { |
| 651 | case KEY_RSA_CERT: |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 652 | /* for RSA we also support SHA2 signatures */ |
| 653 | append_hostkey_type(b, |
| 654 | "rsa-sha2-512-cert-v01@openssh.com"); |
| 655 | append_hostkey_type(b, |
| 656 | "rsa-sha2-256-cert-v01@openssh.com"); |
| 657 | /* FALLTHROUGH */ |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 658 | case KEY_DSA_CERT: |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 659 | case KEY_ECDSA_CERT: |
Damien Miller | 5be9d9e | 2013-12-07 11:24:01 +1100 | [diff] [blame] | 660 | case KEY_ED25519_CERT: |
djm@openbsd.org | 56584cc | 2019-12-15 18:57:30 +0000 | [diff] [blame] | 661 | case KEY_ECDSA_SK_CERT: |
| 662 | case KEY_ED25519_SK_CERT: |
markus@openbsd.org | 1b11ea7 | 2018-02-23 15:58:37 +0000 | [diff] [blame] | 663 | case KEY_XMSS_CERT: |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 664 | append_hostkey_type(b, sshkey_ssh_name(key)); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 665 | break; |
| 666 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 667 | } |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 668 | if ((ret = sshbuf_dup_string(b)) == NULL) |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 669 | fatal("%s: sshbuf_dup_string failed", __func__); |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 670 | sshbuf_free(b); |
| 671 | debug("%s: %s", __func__, ret); |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 672 | return ret; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 673 | } |
| 674 | |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 675 | static struct sshkey * |
djm@openbsd.org | 5104db7 | 2015-01-26 06:10:03 +0000 | [diff] [blame] | 676 | 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] | 677 | { |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 678 | u_int i; |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 679 | struct sshkey *key; |
Ben Lindstrom | 822b634 | 2002-06-23 21:38:49 +0000 | [diff] [blame] | 680 | |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 681 | for (i = 0; i < options.num_host_key_files; i++) { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 682 | switch (type) { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 683 | case KEY_RSA_CERT: |
| 684 | case KEY_DSA_CERT: |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 685 | case KEY_ECDSA_CERT: |
Damien Miller | 5be9d9e | 2013-12-07 11:24:01 +1100 | [diff] [blame] | 686 | case KEY_ED25519_CERT: |
djm@openbsd.org | 56584cc | 2019-12-15 18:57:30 +0000 | [diff] [blame] | 687 | case KEY_ECDSA_SK_CERT: |
| 688 | case KEY_ED25519_SK_CERT: |
markus@openbsd.org | 1b11ea7 | 2018-02-23 15:58:37 +0000 | [diff] [blame] | 689 | case KEY_XMSS_CERT: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 690 | key = sensitive_data.host_certificates[i]; |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 691 | break; |
| 692 | default: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 693 | key = sensitive_data.host_keys[i]; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 694 | if (key == NULL && !need_private) |
| 695 | key = sensitive_data.host_pubkeys[i]; |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 696 | break; |
| 697 | } |
djm@openbsd.org | 56584cc | 2019-12-15 18:57:30 +0000 | [diff] [blame] | 698 | if (key == NULL || key->type != type) |
| 699 | continue; |
| 700 | switch (type) { |
| 701 | case KEY_ECDSA: |
| 702 | case KEY_ECDSA_SK: |
| 703 | case KEY_ECDSA_CERT: |
| 704 | case KEY_ECDSA_SK_CERT: |
| 705 | if (key->ecdsa_nid != nid) |
| 706 | continue; |
| 707 | /* FALLTHROUGH */ |
| 708 | default: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 709 | return need_private ? |
| 710 | sensitive_data.host_keys[i] : key; |
djm@openbsd.org | 56584cc | 2019-12-15 18:57:30 +0000 | [diff] [blame] | 711 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 712 | } |
| 713 | return NULL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 714 | } |
| 715 | |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 716 | struct sshkey * |
djm@openbsd.org | 5104db7 | 2015-01-26 06:10:03 +0000 | [diff] [blame] | 717 | get_hostkey_public_by_type(int type, int nid, struct ssh *ssh) |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 718 | { |
djm@openbsd.org | 5104db7 | 2015-01-26 06:10:03 +0000 | [diff] [blame] | 719 | return get_hostkey_by_type(type, nid, 0, ssh); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 720 | } |
| 721 | |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 722 | struct sshkey * |
djm@openbsd.org | 5104db7 | 2015-01-26 06:10:03 +0000 | [diff] [blame] | 723 | get_hostkey_private_by_type(int type, int nid, struct ssh *ssh) |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 724 | { |
djm@openbsd.org | 5104db7 | 2015-01-26 06:10:03 +0000 | [diff] [blame] | 725 | return get_hostkey_by_type(type, nid, 1, ssh); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 726 | } |
| 727 | |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 728 | struct sshkey * |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 729 | get_hostkey_by_index(int ind) |
| 730 | { |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 731 | if (ind < 0 || (u_int)ind >= options.num_host_key_files) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 732 | return (NULL); |
| 733 | return (sensitive_data.host_keys[ind]); |
| 734 | } |
| 735 | |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 736 | struct sshkey * |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 737 | get_hostkey_public_by_index(int ind, struct ssh *ssh) |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 738 | { |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 739 | if (ind < 0 || (u_int)ind >= options.num_host_key_files) |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 740 | return (NULL); |
| 741 | return (sensitive_data.host_pubkeys[ind]); |
| 742 | } |
| 743 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 744 | int |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 745 | get_hostkey_index(struct sshkey *key, int compare, struct ssh *ssh) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 746 | { |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 747 | u_int i; |
Ben Lindstrom | 822b634 | 2002-06-23 21:38:49 +0000 | [diff] [blame] | 748 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 749 | for (i = 0; i < options.num_host_key_files; i++) { |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 750 | if (sshkey_is_cert(key)) { |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 751 | if (key == sensitive_data.host_certificates[i] || |
| 752 | (compare && sensitive_data.host_certificates[i] && |
| 753 | sshkey_equal(key, |
| 754 | sensitive_data.host_certificates[i]))) |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 755 | return (i); |
| 756 | } else { |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 757 | if (key == sensitive_data.host_keys[i] || |
| 758 | (compare && sensitive_data.host_keys[i] && |
| 759 | sshkey_equal(key, sensitive_data.host_keys[i]))) |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 760 | return (i); |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 761 | if (key == sensitive_data.host_pubkeys[i] || |
| 762 | (compare && sensitive_data.host_pubkeys[i] && |
| 763 | sshkey_equal(key, sensitive_data.host_pubkeys[i]))) |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 764 | return (i); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 765 | } |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 766 | } |
| 767 | return (-1); |
| 768 | } |
| 769 | |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 770 | /* Inform the client of all hostkeys */ |
| 771 | static void |
| 772 | notify_hostkeys(struct ssh *ssh) |
| 773 | { |
| 774 | struct sshbuf *buf; |
| 775 | struct sshkey *key; |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 776 | u_int i, nkeys; |
| 777 | int r; |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 778 | char *fp; |
| 779 | |
dtucker@openbsd.org | d8f391c | 2015-04-10 05:16:50 +0000 | [diff] [blame] | 780 | /* Some clients cannot cope with the hostkeys message, skip those. */ |
djm@openbsd.org | 04c091f | 2019-01-19 21:43:56 +0000 | [diff] [blame] | 781 | if (ssh->compat & SSH_BUG_HOSTKEYS) |
dtucker@openbsd.org | d8f391c | 2015-04-10 05:16:50 +0000 | [diff] [blame] | 782 | return; |
| 783 | |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 784 | if ((buf = sshbuf_new()) == NULL) |
| 785 | fatal("%s: sshbuf_new", __func__); |
| 786 | for (i = nkeys = 0; i < options.num_host_key_files; i++) { |
| 787 | key = get_hostkey_public_by_index(i, ssh); |
| 788 | if (key == NULL || key->type == KEY_UNSPEC || |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 789 | sshkey_is_cert(key)) |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 790 | continue; |
| 791 | fp = sshkey_fingerprint(key, options.fingerprint_hash, |
| 792 | SSH_FP_DEFAULT); |
| 793 | debug3("%s: key %d: %s %s", __func__, i, |
| 794 | sshkey_ssh_name(key), fp); |
| 795 | free(fp); |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 796 | if (nkeys == 0) { |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 797 | /* |
| 798 | * Start building the request when we find the |
| 799 | * first usable key. |
| 800 | */ |
| 801 | if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 || |
| 802 | (r = sshpkt_put_cstring(ssh, "hostkeys-00@openssh.com")) != 0 || |
| 803 | (r = sshpkt_put_u8(ssh, 0)) != 0) /* want reply */ |
| 804 | sshpkt_fatal(ssh, r, "%s: start request", __func__); |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 805 | } |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 806 | /* Append the key to the request */ |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 807 | sshbuf_reset(buf); |
| 808 | if ((r = sshkey_putb(key, buf)) != 0) |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 809 | fatal("%s: couldn't put hostkey %d: %s", |
| 810 | __func__, i, ssh_err(r)); |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 811 | if ((r = sshpkt_put_stringb(ssh, buf)) != 0) |
| 812 | sshpkt_fatal(ssh, r, "%s: append key", __func__); |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 813 | nkeys++; |
| 814 | } |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 815 | debug3("%s: sent %u hostkeys", __func__, nkeys); |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 816 | if (nkeys == 0) |
| 817 | fatal("%s: no hostkeys", __func__); |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 818 | if ((r = sshpkt_send(ssh)) != 0) |
| 819 | sshpkt_fatal(ssh, r, "%s: send", __func__); |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 820 | sshbuf_free(buf); |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 821 | } |
| 822 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 823 | /* |
| 824 | * returns 1 if connection should be dropped, 0 otherwise. |
| 825 | * dropping starts at connection #max_startups_begin with a probability |
| 826 | * of (max_startups_rate/100). the probability increases linearly until |
| 827 | * all connections are dropped for startups > max_startups |
| 828 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 829 | static int |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 830 | drop_connection(int startups) |
| 831 | { |
Darren Tucker | 178fa66 | 2004-11-05 20:09:09 +1100 | [diff] [blame] | 832 | int p, r; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 833 | |
| 834 | if (startups < options.max_startups_begin) |
| 835 | return 0; |
| 836 | if (startups >= options.max_startups) |
| 837 | return 1; |
| 838 | if (options.max_startups_rate == 100) |
| 839 | return 1; |
| 840 | |
| 841 | p = 100 - options.max_startups_rate; |
| 842 | p *= startups - options.max_startups_begin; |
Darren Tucker | 178fa66 | 2004-11-05 20:09:09 +1100 | [diff] [blame] | 843 | p /= options.max_startups - options.max_startups_begin; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 844 | p += options.max_startups_rate; |
Damien Miller | 354c48c | 2008-05-19 14:50:00 +1000 | [diff] [blame] | 845 | r = arc4random_uniform(100); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 846 | |
Darren Tucker | 3269b13 | 2004-11-05 20:20:59 +1100 | [diff] [blame] | 847 | debug("drop_connection: p %d, r %d", p, r); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 848 | return (r < p) ? 1 : 0; |
| 849 | } |
| 850 | |
Ben Lindstrom | ade03f6 | 2001-12-06 18:22:17 +0000 | [diff] [blame] | 851 | static void |
| 852 | usage(void) |
| 853 | { |
Damien Miller | 0c889cd | 2004-03-22 09:36:00 +1100 | [diff] [blame] | 854 | fprintf(stderr, "%s, %s\n", |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 855 | SSH_RELEASE, |
| 856 | #ifdef WITH_OPENSSL |
djm@openbsd.org | a65784c | 2018-10-23 05:56:35 +0000 | [diff] [blame] | 857 | OpenSSL_version(OPENSSL_VERSION) |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 858 | #else |
| 859 | "without OpenSSL" |
| 860 | #endif |
| 861 | ); |
Damien Miller | b408786 | 2004-03-22 09:35:21 +1100 | [diff] [blame] | 862 | fprintf(stderr, |
naddy@openbsd.org | c38ea63 | 2016-08-15 12:27:56 +0000 | [diff] [blame] | 863 | "usage: sshd [-46DdeiqTt] [-C connection_spec] [-c host_cert_file]\n" |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 864 | " [-E log_file] [-f config_file] [-g login_grace_time]\n" |
naddy@openbsd.org | c38ea63 | 2016-08-15 12:27:56 +0000 | [diff] [blame] | 865 | " [-h host_key_file] [-o option] [-p port] [-u len]\n" |
Damien Miller | b408786 | 2004-03-22 09:35:21 +1100 | [diff] [blame] | 866 | ); |
Ben Lindstrom | ade03f6 | 2001-12-06 18:22:17 +0000 | [diff] [blame] | 867 | exit(1); |
| 868 | } |
| 869 | |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 870 | static void |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 871 | send_rexec_state(int fd, struct sshbuf *conf) |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 872 | { |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 873 | struct sshbuf *m; |
| 874 | int r; |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 875 | |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 876 | debug3("%s: entering fd = %d config len %zu", __func__, fd, |
| 877 | sshbuf_len(conf)); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 878 | |
| 879 | /* |
| 880 | * Protocol from reexec master to child: |
| 881 | * string configuration |
Darren Tucker | c6f8219 | 2005-09-27 22:46:32 +1000 | [diff] [blame] | 882 | * string rngseed (only if OpenSSL is not self-seeded) |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 883 | */ |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 884 | if ((m = sshbuf_new()) == NULL) |
| 885 | fatal("%s: sshbuf_new failed", __func__); |
| 886 | if ((r = sshbuf_put_stringb(m, conf)) != 0) |
| 887 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 888 | |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 889 | #if defined(WITH_OPENSSL) && !defined(OPENSSL_PRNG_ONLY) |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 890 | rexec_send_rng_seed(m); |
Darren Tucker | c6f8219 | 2005-09-27 22:46:32 +1000 | [diff] [blame] | 891 | #endif |
| 892 | |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 893 | if (ssh_msg_send(fd, 0, m) == -1) |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 894 | fatal("%s: ssh_msg_send failed", __func__); |
| 895 | |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 896 | sshbuf_free(m); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 897 | |
| 898 | debug3("%s: done", __func__); |
| 899 | } |
| 900 | |
| 901 | static void |
markus@openbsd.org | c3cb779 | 2018-07-09 21:29:36 +0000 | [diff] [blame] | 902 | recv_rexec_state(int fd, struct sshbuf *conf) |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 903 | { |
markus@openbsd.org | c3cb779 | 2018-07-09 21:29:36 +0000 | [diff] [blame] | 904 | struct sshbuf *m; |
| 905 | u_char *cp, ver; |
| 906 | size_t len; |
| 907 | int r; |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 908 | |
| 909 | debug3("%s: entering fd = %d", __func__, fd); |
| 910 | |
markus@openbsd.org | c3cb779 | 2018-07-09 21:29:36 +0000 | [diff] [blame] | 911 | if ((m = sshbuf_new()) == NULL) |
| 912 | fatal("%s: sshbuf_new failed", __func__); |
| 913 | if (ssh_msg_recv(fd, m) == -1) |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 914 | fatal("%s: ssh_msg_recv failed", __func__); |
markus@openbsd.org | c3cb779 | 2018-07-09 21:29:36 +0000 | [diff] [blame] | 915 | if ((r = sshbuf_get_u8(m, &ver)) != 0) |
| 916 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 917 | if (ver != 0) |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 918 | fatal("%s: rexec version mismatch", __func__); |
markus@openbsd.org | c3cb779 | 2018-07-09 21:29:36 +0000 | [diff] [blame] | 919 | if ((r = sshbuf_get_string(m, &cp, &len)) != 0) |
| 920 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 921 | if (conf != NULL && (r = sshbuf_put(conf, cp, len))) |
| 922 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 923 | #if defined(WITH_OPENSSL) && !defined(OPENSSL_PRNG_ONLY) |
markus@openbsd.org | c3cb779 | 2018-07-09 21:29:36 +0000 | [diff] [blame] | 924 | rexec_recv_rng_seed(m); |
Darren Tucker | c6f8219 | 2005-09-27 22:46:32 +1000 | [diff] [blame] | 925 | #endif |
| 926 | |
markus@openbsd.org | c3cb779 | 2018-07-09 21:29:36 +0000 | [diff] [blame] | 927 | free(cp); |
| 928 | sshbuf_free(m); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 929 | |
| 930 | debug3("%s: done", __func__); |
| 931 | } |
| 932 | |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 933 | /* Accept a connection from inetd */ |
| 934 | static void |
| 935 | server_accept_inetd(int *sock_in, int *sock_out) |
| 936 | { |
| 937 | int fd; |
| 938 | |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 939 | if (rexeced_flag) { |
| 940 | close(REEXEC_CONFIG_PASS_FD); |
| 941 | *sock_in = *sock_out = dup(STDIN_FILENO); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 942 | } else { |
| 943 | *sock_in = dup(STDIN_FILENO); |
| 944 | *sock_out = dup(STDOUT_FILENO); |
| 945 | } |
| 946 | /* |
| 947 | * We intentionally do not close the descriptors 0, 1, and 2 |
| 948 | * as our code for setting the descriptors won't work if |
| 949 | * ttyfd happens to be one of those. |
| 950 | */ |
| 951 | if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { |
| 952 | dup2(fd, STDIN_FILENO); |
| 953 | dup2(fd, STDOUT_FILENO); |
Darren Tucker | 0cca17f | 2013-06-06 08:21:14 +1000 | [diff] [blame] | 954 | if (!log_stderr) |
| 955 | dup2(fd, STDERR_FILENO); |
| 956 | if (fd > (log_stderr ? STDERR_FILENO : STDOUT_FILENO)) |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 957 | close(fd); |
| 958 | } |
| 959 | debug("inetd sockets after dupping: %d, %d", *sock_in, *sock_out); |
| 960 | } |
| 961 | |
| 962 | /* |
| 963 | * Listen for TCP connections |
| 964 | */ |
| 965 | static void |
djm@openbsd.org | acf559e | 2017-10-25 00:15:35 +0000 | [diff] [blame] | 966 | listen_on_addrs(struct listenaddr *la) |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 967 | { |
djm@openbsd.org | acf559e | 2017-10-25 00:15:35 +0000 | [diff] [blame] | 968 | int ret, listen_sock; |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 969 | struct addrinfo *ai; |
| 970 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
| 971 | |
djm@openbsd.org | acf559e | 2017-10-25 00:15:35 +0000 | [diff] [blame] | 972 | for (ai = la->addrs; ai; ai = ai->ai_next) { |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 973 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 974 | continue; |
| 975 | if (num_listen_socks >= MAX_LISTEN_SOCKS) |
| 976 | fatal("Too many listen sockets. " |
| 977 | "Enlarge MAX_LISTEN_SOCKS"); |
| 978 | if ((ret = getnameinfo(ai->ai_addr, ai->ai_addrlen, |
| 979 | ntop, sizeof(ntop), strport, sizeof(strport), |
| 980 | NI_NUMERICHOST|NI_NUMERICSERV)) != 0) { |
| 981 | error("getnameinfo failed: %.100s", |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame] | 982 | ssh_gai_strerror(ret)); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 983 | continue; |
| 984 | } |
| 985 | /* Create socket for listening. */ |
Darren Tucker | 7bd98e7 | 2010-01-10 10:31:12 +1100 | [diff] [blame] | 986 | listen_sock = socket(ai->ai_family, ai->ai_socktype, |
| 987 | ai->ai_protocol); |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 988 | if (listen_sock == -1) { |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 989 | /* kernel may not support ipv6 */ |
| 990 | verbose("socket: %.100s", strerror(errno)); |
| 991 | continue; |
| 992 | } |
| 993 | if (set_nonblock(listen_sock) == -1) { |
| 994 | close(listen_sock); |
| 995 | continue; |
| 996 | } |
djm@openbsd.org | 8071a69 | 2017-02-24 03:16:34 +0000 | [diff] [blame] | 997 | if (fcntl(listen_sock, F_SETFD, FD_CLOEXEC) == -1) { |
| 998 | verbose("socket: CLOEXEC: %s", strerror(errno)); |
| 999 | close(listen_sock); |
| 1000 | continue; |
| 1001 | } |
djm@openbsd.org | acf559e | 2017-10-25 00:15:35 +0000 | [diff] [blame] | 1002 | /* Socket options */ |
| 1003 | set_reuseaddr(listen_sock); |
| 1004 | if (la->rdomain != NULL && |
| 1005 | set_rdomain(listen_sock, la->rdomain) == -1) { |
| 1006 | close(listen_sock); |
| 1007 | continue; |
| 1008 | } |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1009 | |
Damien Miller | 49d2a28 | 2008-01-20 08:56:00 +1100 | [diff] [blame] | 1010 | /* Only communicate in IPv6 over AF_INET6 sockets. */ |
Damien Miller | 04ee0f8 | 2009-11-18 17:48:30 +1100 | [diff] [blame] | 1011 | if (ai->ai_family == AF_INET6) |
| 1012 | sock_set_v6only(listen_sock); |
Damien Miller | 49d2a28 | 2008-01-20 08:56:00 +1100 | [diff] [blame] | 1013 | |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1014 | debug("Bind to port %s on %s.", strport, ntop); |
| 1015 | |
| 1016 | /* Bind the socket to the desired port. */ |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 1017 | if (bind(listen_sock, ai->ai_addr, ai->ai_addrlen) == -1) { |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1018 | error("Bind to port %s on %s failed: %.200s.", |
| 1019 | strport, ntop, strerror(errno)); |
| 1020 | close(listen_sock); |
| 1021 | continue; |
| 1022 | } |
| 1023 | listen_socks[num_listen_socks] = listen_sock; |
| 1024 | num_listen_socks++; |
| 1025 | |
| 1026 | /* Start listening on the port. */ |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 1027 | if (listen(listen_sock, SSH_LISTEN_BACKLOG) == -1) |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1028 | fatal("listen on [%s]:%s: %.100s", |
| 1029 | ntop, strport, strerror(errno)); |
djm@openbsd.org | acf559e | 2017-10-25 00:15:35 +0000 | [diff] [blame] | 1030 | logit("Server listening on %s port %s%s%s.", |
| 1031 | ntop, strport, |
| 1032 | la->rdomain == NULL ? "" : " rdomain ", |
| 1033 | la->rdomain == NULL ? "" : la->rdomain); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1034 | } |
djm@openbsd.org | acf559e | 2017-10-25 00:15:35 +0000 | [diff] [blame] | 1035 | } |
| 1036 | |
| 1037 | static void |
| 1038 | server_listen(void) |
| 1039 | { |
| 1040 | u_int i; |
| 1041 | |
| 1042 | for (i = 0; i < options.num_listen_addrs; i++) { |
| 1043 | listen_on_addrs(&options.listen_addrs[i]); |
| 1044 | freeaddrinfo(options.listen_addrs[i].addrs); |
| 1045 | free(options.listen_addrs[i].rdomain); |
| 1046 | memset(&options.listen_addrs[i], 0, |
| 1047 | sizeof(options.listen_addrs[i])); |
| 1048 | } |
| 1049 | free(options.listen_addrs); |
| 1050 | options.listen_addrs = NULL; |
| 1051 | options.num_listen_addrs = 0; |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1052 | |
| 1053 | if (!num_listen_socks) |
| 1054 | fatal("Cannot bind any address."); |
| 1055 | } |
| 1056 | |
| 1057 | /* |
| 1058 | * The main TCP accept loop. Note that, for the non-debug case, returns |
| 1059 | * from this function are in a forked subprocess. |
| 1060 | */ |
| 1061 | static void |
| 1062 | server_accept_loop(int *sock_in, int *sock_out, int *newsock, int *config_s) |
| 1063 | { |
| 1064 | fd_set *fdset; |
| 1065 | int i, j, ret, maxfd; |
djm@openbsd.org | 70d38c3 | 2020-01-21 22:39:57 +0000 | [diff] [blame] | 1066 | int ostartups = -1, startups = 0, listening = 0, lameduck = 0; |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1067 | int startup_p[2] = { -1 , -1 }; |
djm@openbsd.org | 76a24b3 | 2019-03-01 02:32:39 +0000 | [diff] [blame] | 1068 | char c = 0; |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1069 | struct sockaddr_storage from; |
| 1070 | socklen_t fromlen; |
| 1071 | pid_t pid; |
Damien Miller | 045bda5 | 2013-09-14 09:44:37 +1000 | [diff] [blame] | 1072 | u_char rnd[256]; |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1073 | |
| 1074 | /* setup fd set for accept */ |
| 1075 | fdset = NULL; |
| 1076 | maxfd = 0; |
| 1077 | for (i = 0; i < num_listen_socks; i++) |
| 1078 | if (listen_socks[i] > maxfd) |
| 1079 | maxfd = listen_socks[i]; |
| 1080 | /* pipes connected to unauthenticated childs */ |
| 1081 | startup_pipes = xcalloc(options.max_startups, sizeof(int)); |
djm@openbsd.org | 76a24b3 | 2019-03-01 02:32:39 +0000 | [diff] [blame] | 1082 | startup_flags = xcalloc(options.max_startups, sizeof(int)); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1083 | for (i = 0; i < options.max_startups; i++) |
| 1084 | startup_pipes[i] = -1; |
| 1085 | |
| 1086 | /* |
| 1087 | * Stay listening for connections until the system crashes or |
| 1088 | * the daemon is killed with a signal. |
| 1089 | */ |
| 1090 | for (;;) { |
djm@openbsd.org | 70d38c3 | 2020-01-21 22:39:57 +0000 | [diff] [blame] | 1091 | if (ostartups != startups) { |
djm@openbsd.org | a8c05c6 | 2020-01-24 23:56:01 +0000 | [diff] [blame] | 1092 | setproctitle("%s [listener] %d of %d-%d startups", |
| 1093 | listener_proctitle, startups, |
| 1094 | options.max_startups_begin, options.max_startups); |
djm@openbsd.org | 70d38c3 | 2020-01-21 22:39:57 +0000 | [diff] [blame] | 1095 | ostartups = startups; |
| 1096 | } |
djm@openbsd.org | 76a24b3 | 2019-03-01 02:32:39 +0000 | [diff] [blame] | 1097 | if (received_sighup) { |
| 1098 | if (!lameduck) { |
| 1099 | debug("Received SIGHUP; waiting for children"); |
| 1100 | close_listen_socks(); |
| 1101 | lameduck = 1; |
| 1102 | } |
| 1103 | if (listening <= 0) |
| 1104 | sighup_restart(); |
| 1105 | } |
mmcc@openbsd.org | d59ce08 | 2015-12-10 17:08:40 +0000 | [diff] [blame] | 1106 | free(fdset); |
deraadt@openbsd.org | ce445b0 | 2015-08-20 22:32:42 +0000 | [diff] [blame] | 1107 | fdset = xcalloc(howmany(maxfd + 1, NFDBITS), |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1108 | sizeof(fd_mask)); |
| 1109 | |
| 1110 | for (i = 0; i < num_listen_socks; i++) |
| 1111 | FD_SET(listen_socks[i], fdset); |
| 1112 | for (i = 0; i < options.max_startups; i++) |
| 1113 | if (startup_pipes[i] != -1) |
| 1114 | FD_SET(startup_pipes[i], fdset); |
| 1115 | |
| 1116 | /* Wait in select until there is a connection. */ |
| 1117 | ret = select(maxfd+1, fdset, NULL, NULL, NULL); |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 1118 | if (ret == -1 && errno != EINTR) |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1119 | error("select: %.100s", strerror(errno)); |
| 1120 | if (received_sigterm) { |
| 1121 | logit("Received signal %d; terminating.", |
| 1122 | (int) received_sigterm); |
| 1123 | close_listen_socks(); |
djm@openbsd.org | 161cf41 | 2014-12-22 07:55:51 +0000 | [diff] [blame] | 1124 | if (options.pid_file != NULL) |
| 1125 | unlink(options.pid_file); |
Damien Miller | 26b57ce | 2011-05-05 14:15:09 +1000 | [diff] [blame] | 1126 | exit(received_sigterm == SIGTERM ? 0 : 255); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1127 | } |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 1128 | if (ret == -1) |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1129 | continue; |
| 1130 | |
djm@openbsd.org | 76a24b3 | 2019-03-01 02:32:39 +0000 | [diff] [blame] | 1131 | for (i = 0; i < options.max_startups; i++) { |
| 1132 | if (startup_pipes[i] == -1 || |
| 1133 | !FD_ISSET(startup_pipes[i], fdset)) |
| 1134 | continue; |
| 1135 | switch (read(startup_pipes[i], &c, sizeof(c))) { |
| 1136 | case -1: |
| 1137 | if (errno == EINTR || errno == EAGAIN) |
| 1138 | continue; |
| 1139 | if (errno != EPIPE) { |
| 1140 | error("%s: startup pipe %d (fd=%d): " |
| 1141 | "read %s", __func__, i, |
| 1142 | startup_pipes[i], strerror(errno)); |
| 1143 | } |
| 1144 | /* FALLTHROUGH */ |
| 1145 | case 0: |
| 1146 | /* child exited or completed auth */ |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1147 | close(startup_pipes[i]); |
| 1148 | startup_pipes[i] = -1; |
| 1149 | startups--; |
djm@openbsd.org | 76a24b3 | 2019-03-01 02:32:39 +0000 | [diff] [blame] | 1150 | if (startup_flags[i]) |
| 1151 | listening--; |
| 1152 | break; |
| 1153 | case 1: |
| 1154 | /* child has finished preliminaries */ |
| 1155 | if (startup_flags[i]) { |
| 1156 | listening--; |
| 1157 | startup_flags[i] = 0; |
| 1158 | } |
| 1159 | break; |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1160 | } |
djm@openbsd.org | 76a24b3 | 2019-03-01 02:32:39 +0000 | [diff] [blame] | 1161 | } |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1162 | for (i = 0; i < num_listen_socks; i++) { |
| 1163 | if (!FD_ISSET(listen_socks[i], fdset)) |
| 1164 | continue; |
| 1165 | fromlen = sizeof(from); |
| 1166 | *newsock = accept(listen_socks[i], |
| 1167 | (struct sockaddr *)&from, &fromlen); |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 1168 | if (*newsock == -1) { |
Damien Miller | 37f1c08 | 2013-04-23 15:20:43 +1000 | [diff] [blame] | 1169 | if (errno != EINTR && errno != EWOULDBLOCK && |
| 1170 | errno != ECONNABORTED && errno != EAGAIN) |
Damien Miller | a116d13 | 2012-04-22 11:23:46 +1000 | [diff] [blame] | 1171 | error("accept: %.100s", |
| 1172 | strerror(errno)); |
| 1173 | if (errno == EMFILE || errno == ENFILE) |
| 1174 | usleep(100 * 1000); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1175 | continue; |
| 1176 | } |
| 1177 | if (unset_nonblock(*newsock) == -1) { |
| 1178 | close(*newsock); |
| 1179 | continue; |
| 1180 | } |
| 1181 | if (drop_connection(startups) == 1) { |
djm@openbsd.org | 08a1e70 | 2016-12-09 03:04:29 +0000 | [diff] [blame] | 1182 | char *laddr = get_local_ipaddr(*newsock); |
| 1183 | char *raddr = get_peer_ipaddr(*newsock); |
dtucker@openbsd.org | fc173ae | 2019-11-13 11:25:11 +0000 | [diff] [blame] | 1184 | char msg[] = "Exceeded MaxStartups\r\n"; |
djm@openbsd.org | 08a1e70 | 2016-12-09 03:04:29 +0000 | [diff] [blame] | 1185 | |
| 1186 | verbose("drop connection #%d from [%s]:%d " |
| 1187 | "on [%s]:%d past MaxStartups", startups, |
| 1188 | raddr, get_peer_port(*newsock), |
| 1189 | laddr, get_local_port(*newsock)); |
| 1190 | free(laddr); |
| 1191 | free(raddr); |
dtucker@openbsd.org | fc173ae | 2019-11-13 11:25:11 +0000 | [diff] [blame] | 1192 | /* best-effort notification to client */ |
| 1193 | (void)write(*newsock, msg, strlen(msg)); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1194 | close(*newsock); |
| 1195 | continue; |
| 1196 | } |
| 1197 | if (pipe(startup_p) == -1) { |
| 1198 | close(*newsock); |
| 1199 | continue; |
| 1200 | } |
| 1201 | |
| 1202 | if (rexec_flag && socketpair(AF_UNIX, |
| 1203 | SOCK_STREAM, 0, config_s) == -1) { |
| 1204 | error("reexec socketpair: %s", |
| 1205 | strerror(errno)); |
| 1206 | close(*newsock); |
| 1207 | close(startup_p[0]); |
| 1208 | close(startup_p[1]); |
| 1209 | continue; |
| 1210 | } |
| 1211 | |
| 1212 | for (j = 0; j < options.max_startups; j++) |
| 1213 | if (startup_pipes[j] == -1) { |
| 1214 | startup_pipes[j] = startup_p[0]; |
| 1215 | if (maxfd < startup_p[0]) |
| 1216 | maxfd = startup_p[0]; |
| 1217 | startups++; |
djm@openbsd.org | 76a24b3 | 2019-03-01 02:32:39 +0000 | [diff] [blame] | 1218 | startup_flags[j] = 1; |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1219 | break; |
| 1220 | } |
| 1221 | |
| 1222 | /* |
| 1223 | * Got connection. Fork a child to handle it, unless |
| 1224 | * we are in debugging mode. |
| 1225 | */ |
| 1226 | if (debug_flag) { |
| 1227 | /* |
| 1228 | * In debugging mode. Close the listening |
| 1229 | * socket, and start processing the |
| 1230 | * connection without forking. |
| 1231 | */ |
| 1232 | debug("Server will not fork when running in debugging mode."); |
| 1233 | close_listen_socks(); |
| 1234 | *sock_in = *newsock; |
| 1235 | *sock_out = *newsock; |
| 1236 | close(startup_p[0]); |
| 1237 | close(startup_p[1]); |
| 1238 | startup_pipe = -1; |
| 1239 | pid = getpid(); |
| 1240 | if (rexec_flag) { |
markus@openbsd.org | c3cb779 | 2018-07-09 21:29:36 +0000 | [diff] [blame] | 1241 | send_rexec_state(config_s[0], cfg); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1242 | close(config_s[0]); |
| 1243 | } |
djm@openbsd.org | 76a24b3 | 2019-03-01 02:32:39 +0000 | [diff] [blame] | 1244 | return; |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1245 | } |
| 1246 | |
| 1247 | /* |
| 1248 | * Normal production daemon. Fork, and have |
| 1249 | * the child process the connection. The |
| 1250 | * parent continues listening. |
| 1251 | */ |
Damien Miller | 1b06dc3 | 2006-08-31 03:24:41 +1000 | [diff] [blame] | 1252 | platform_pre_fork(); |
djm@openbsd.org | 76a24b3 | 2019-03-01 02:32:39 +0000 | [diff] [blame] | 1253 | listening++; |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1254 | if ((pid = fork()) == 0) { |
| 1255 | /* |
| 1256 | * Child. Close the listening and |
| 1257 | * max_startup sockets. Start using |
| 1258 | * the accepted socket. Reinitialize |
| 1259 | * logging (since our pid has changed). |
djm@openbsd.org | 76a24b3 | 2019-03-01 02:32:39 +0000 | [diff] [blame] | 1260 | * We return from this function to handle |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1261 | * the connection. |
| 1262 | */ |
Damien Miller | 1b06dc3 | 2006-08-31 03:24:41 +1000 | [diff] [blame] | 1263 | platform_post_fork_child(); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1264 | startup_pipe = startup_p[1]; |
| 1265 | close_startup_pipes(); |
| 1266 | close_listen_socks(); |
| 1267 | *sock_in = *newsock; |
| 1268 | *sock_out = *newsock; |
| 1269 | log_init(__progname, |
| 1270 | options.log_level, |
| 1271 | options.log_facility, |
| 1272 | log_stderr); |
| 1273 | if (rexec_flag) |
| 1274 | close(config_s[0]); |
djm@openbsd.org | 76a24b3 | 2019-03-01 02:32:39 +0000 | [diff] [blame] | 1275 | else { |
| 1276 | /* |
| 1277 | * Signal parent that the preliminaries |
| 1278 | * for this child are complete. For the |
| 1279 | * re-exec case, this happens after the |
| 1280 | * child has received the rexec state |
| 1281 | * from the server. |
| 1282 | */ |
| 1283 | (void)atomicio(vwrite, startup_pipe, |
| 1284 | "\0", 1); |
| 1285 | } |
| 1286 | return; |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1287 | } |
| 1288 | |
| 1289 | /* Parent. Stay in the loop. */ |
Damien Miller | 1b06dc3 | 2006-08-31 03:24:41 +1000 | [diff] [blame] | 1290 | platform_post_fork_parent(pid); |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 1291 | if (pid == -1) |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1292 | error("fork: %.100s", strerror(errno)); |
| 1293 | else |
| 1294 | debug("Forked child %ld.", (long)pid); |
| 1295 | |
| 1296 | close(startup_p[1]); |
| 1297 | |
| 1298 | if (rexec_flag) { |
markus@openbsd.org | c3cb779 | 2018-07-09 21:29:36 +0000 | [diff] [blame] | 1299 | send_rexec_state(config_s[0], cfg); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1300 | close(config_s[0]); |
| 1301 | close(config_s[1]); |
| 1302 | } |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1303 | close(*newsock); |
| 1304 | |
| 1305 | /* |
| 1306 | * Ensure that our random state differs |
| 1307 | * from that of the child |
| 1308 | */ |
| 1309 | arc4random_stir(); |
Damien Miller | 045bda5 | 2013-09-14 09:44:37 +1000 | [diff] [blame] | 1310 | arc4random_buf(rnd, sizeof(rnd)); |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 1311 | #ifdef WITH_OPENSSL |
Damien Miller | 045bda5 | 2013-09-14 09:44:37 +1000 | [diff] [blame] | 1312 | RAND_seed(rnd, sizeof(rnd)); |
Damien Miller | 07889c7 | 2015-11-14 18:44:49 +1100 | [diff] [blame] | 1313 | if ((RAND_bytes((u_char *)rnd, 1)) != 1) |
| 1314 | fatal("%s: RAND_bytes failed", __func__); |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 1315 | #endif |
Damien Miller | 1d2c456 | 2014-02-04 11:18:20 +1100 | [diff] [blame] | 1316 | explicit_bzero(rnd, sizeof(rnd)); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1317 | } |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1318 | } |
| 1319 | } |
| 1320 | |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1321 | /* |
| 1322 | * If IP options are supported, make sure there are none (log and |
| 1323 | * return an error if any are found). Basically we are worried about |
| 1324 | * source routing; it can be used to pretend you are somebody |
| 1325 | * (ip-address) you are not. That itself may be "almost acceptable" |
djm@openbsd.org | 001aa55 | 2018-04-10 00:10:49 +0000 | [diff] [blame] | 1326 | * under certain circumstances, but rhosts authentication is useless |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1327 | * if source routing is accepted. Notice also that if we just dropped |
| 1328 | * source routing here, the other side could use IP spoofing to do |
| 1329 | * rest of the interaction and could still bypass security. So we |
| 1330 | * exit here if we detect any IP options. |
| 1331 | */ |
| 1332 | static void |
| 1333 | check_ip_options(struct ssh *ssh) |
| 1334 | { |
| 1335 | #ifdef IP_OPTIONS |
| 1336 | int sock_in = ssh_packet_get_connection_in(ssh); |
| 1337 | struct sockaddr_storage from; |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1338 | u_char opts[200]; |
djm@openbsd.org | dc664d1 | 2016-08-28 22:28:12 +0000 | [diff] [blame] | 1339 | socklen_t i, option_size = sizeof(opts), fromlen = sizeof(from); |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1340 | char text[sizeof(opts) * 3 + 1]; |
| 1341 | |
| 1342 | memset(&from, 0, sizeof(from)); |
| 1343 | if (getpeername(sock_in, (struct sockaddr *)&from, |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 1344 | &fromlen) == -1) |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1345 | return; |
| 1346 | if (from.ss_family != AF_INET) |
| 1347 | return; |
| 1348 | /* XXX IPv6 options? */ |
| 1349 | |
| 1350 | if (getsockopt(sock_in, IPPROTO_IP, IP_OPTIONS, opts, |
| 1351 | &option_size) >= 0 && option_size != 0) { |
| 1352 | text[0] = '\0'; |
| 1353 | for (i = 0; i < option_size; i++) |
| 1354 | snprintf(text + i*3, sizeof(text) - i*3, |
| 1355 | " %2.2x", opts[i]); |
| 1356 | fatal("Connection from %.100s port %d with IP opts: %.800s", |
| 1357 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), text); |
| 1358 | } |
| 1359 | return; |
| 1360 | #endif /* IP_OPTIONS */ |
| 1361 | } |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1362 | |
djm@openbsd.org | 35eb33f | 2017-10-25 00:17:08 +0000 | [diff] [blame] | 1363 | /* Set the routing domain for this process */ |
| 1364 | static void |
| 1365 | set_process_rdomain(struct ssh *ssh, const char *name) |
| 1366 | { |
Damien Miller | 43c29bb | 2017-10-25 13:10:59 +1100 | [diff] [blame] | 1367 | #if defined(HAVE_SYS_SET_PROCESS_RDOMAIN) |
| 1368 | if (name == NULL) |
| 1369 | return; /* default */ |
| 1370 | |
| 1371 | if (strcmp(name, "%D") == 0) { |
| 1372 | /* "expands" to routing domain of connection */ |
| 1373 | if ((name = ssh_packet_rdomain_in(ssh)) == NULL) |
| 1374 | return; |
| 1375 | } |
| 1376 | /* NB. We don't pass 'ssh' to sys_set_process_rdomain() */ |
| 1377 | return sys_set_process_rdomain(name); |
| 1378 | #elif defined(__OpenBSD__) |
djm@openbsd.org | 35eb33f | 2017-10-25 00:17:08 +0000 | [diff] [blame] | 1379 | int rtable, ortable = getrtable(); |
| 1380 | const char *errstr; |
| 1381 | |
| 1382 | if (name == NULL) |
| 1383 | return; /* default */ |
| 1384 | |
| 1385 | if (strcmp(name, "%D") == 0) { |
| 1386 | /* "expands" to routing domain of connection */ |
| 1387 | if ((name = ssh_packet_rdomain_in(ssh)) == NULL) |
| 1388 | return; |
| 1389 | } |
| 1390 | |
| 1391 | rtable = (int)strtonum(name, 0, 255, &errstr); |
| 1392 | if (errstr != NULL) /* Shouldn't happen */ |
| 1393 | fatal("Invalid routing domain \"%s\": %s", name, errstr); |
| 1394 | if (rtable != ortable && setrtable(rtable) != 0) |
| 1395 | fatal("Unable to set routing domain %d: %s", |
| 1396 | rtable, strerror(errno)); |
| 1397 | debug("%s: set routing domain %d (was %d)", __func__, rtable, ortable); |
Damien Miller | 43c29bb | 2017-10-25 13:10:59 +1100 | [diff] [blame] | 1398 | #else /* defined(__OpenBSD__) */ |
| 1399 | fatal("Unable to set routing domain: not supported in this platform"); |
| 1400 | #endif |
djm@openbsd.org | 35eb33f | 2017-10-25 00:17:08 +0000 | [diff] [blame] | 1401 | } |
| 1402 | |
dtucker@openbsd.org | e9d910b | 2018-04-13 03:57:26 +0000 | [diff] [blame] | 1403 | static void |
| 1404 | accumulate_host_timing_secret(struct sshbuf *server_cfg, |
djm@openbsd.org | 4f7a56d | 2019-06-21 04:21:04 +0000 | [diff] [blame] | 1405 | struct sshkey *key) |
dtucker@openbsd.org | e9d910b | 2018-04-13 03:57:26 +0000 | [diff] [blame] | 1406 | { |
| 1407 | static struct ssh_digest_ctx *ctx; |
| 1408 | u_char *hash; |
| 1409 | size_t len; |
| 1410 | struct sshbuf *buf; |
| 1411 | int r; |
| 1412 | |
| 1413 | if (ctx == NULL && (ctx = ssh_digest_start(SSH_DIGEST_SHA512)) == NULL) |
| 1414 | fatal("%s: ssh_digest_start", __func__); |
| 1415 | if (key == NULL) { /* finalize */ |
| 1416 | /* add server config in case we are using agent for host keys */ |
| 1417 | if (ssh_digest_update(ctx, sshbuf_ptr(server_cfg), |
| 1418 | sshbuf_len(server_cfg)) != 0) |
| 1419 | fatal("%s: ssh_digest_update", __func__); |
| 1420 | len = ssh_digest_bytes(SSH_DIGEST_SHA512); |
| 1421 | hash = xmalloc(len); |
| 1422 | if (ssh_digest_final(ctx, hash, len) != 0) |
| 1423 | fatal("%s: ssh_digest_final", __func__); |
| 1424 | options.timing_secret = PEEK_U64(hash); |
| 1425 | freezero(hash, len); |
| 1426 | ssh_digest_free(ctx); |
| 1427 | ctx = NULL; |
| 1428 | return; |
| 1429 | } |
| 1430 | if ((buf = sshbuf_new()) == NULL) |
| 1431 | fatal("%s could not allocate buffer", __func__); |
| 1432 | if ((r = sshkey_private_serialize(key, buf)) != 0) |
| 1433 | fatal("sshkey_private_serialize: %s", ssh_err(r)); |
| 1434 | if (ssh_digest_update(ctx, sshbuf_ptr(buf), sshbuf_len(buf)) != 0) |
| 1435 | fatal("%s: ssh_digest_update", __func__); |
| 1436 | sshbuf_reset(buf); |
| 1437 | sshbuf_free(buf); |
| 1438 | } |
| 1439 | |
djm@openbsd.org | a8c05c6 | 2020-01-24 23:56:01 +0000 | [diff] [blame] | 1440 | static char * |
| 1441 | prepare_proctitle(int ac, char **av) |
| 1442 | { |
| 1443 | char *ret = NULL; |
| 1444 | int i; |
| 1445 | |
| 1446 | for (i = 0; i < ac; i++) |
| 1447 | xextendf(&ret, " ", "%s", av[i]); |
| 1448 | return ret; |
| 1449 | } |
| 1450 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1451 | /* |
| 1452 | * Main program for the daemon. |
| 1453 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1454 | int |
| 1455 | main(int ac, char **av) |
| 1456 | { |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1457 | struct ssh *ssh = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1458 | extern char *optarg; |
| 1459 | extern int optind; |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 1460 | int r, opt, on = 1, already_daemon, remote_port; |
Damien Miller | 386c6a2 | 2004-06-30 22:40:20 +1000 | [diff] [blame] | 1461 | int sock_in = -1, sock_out = -1, newsock = -1; |
djm@openbsd.org | 68af80e | 2017-10-25 00:19:47 +0000 | [diff] [blame] | 1462 | const char *remote_ip, *rdomain; |
dtucker@openbsd.org | 15fdfc9 | 2015-04-15 23:23:25 +0000 | [diff] [blame] | 1463 | char *fp, *line, *laddr, *logfile = NULL; |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1464 | int config_s[2] = { -1 , -1 }; |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 1465 | u_int i, j; |
Damien Miller | b61f3fc | 2008-07-11 17:36:48 +1000 | [diff] [blame] | 1466 | u_int64_t ibytes, obytes; |
Damien Miller | 6ca16c6 | 2008-06-16 07:50:58 +1000 | [diff] [blame] | 1467 | mode_t new_umask; |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 1468 | struct sshkey *key; |
| 1469 | struct sshkey *pubkey; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1470 | int keytype; |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1471 | Authctxt *authctxt; |
dtucker@openbsd.org@openbsd.org | 0208a48 | 2017-11-03 03:18:53 +0000 | [diff] [blame] | 1472 | struct connection_info *connection_info = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1473 | |
Kevin Steves | 0ea1d9d | 2002-04-25 18:17:04 +0000 | [diff] [blame] | 1474 | #ifdef HAVE_SECUREWARE |
| 1475 | (void)set_auth_parameters(ac, av); |
| 1476 | #endif |
Damien Miller | 59d3d5b | 2003-08-22 09:34:41 +1000 | [diff] [blame] | 1477 | __progname = ssh_get_progname(av[0]); |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 1478 | |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 1479 | /* Save argv. Duplicate so setproctitle emulation doesn't clobber it */ |
Damien Miller | b8c656e | 2000-06-28 15:22:41 +1000 | [diff] [blame] | 1480 | saved_argc = ac; |
Darren Tucker | 17c5d03 | 2004-06-25 14:22:23 +1000 | [diff] [blame] | 1481 | rexec_argc = ac; |
Darren Tucker | d8093e4 | 2006-05-04 16:24:34 +1000 | [diff] [blame] | 1482 | saved_argv = xcalloc(ac + 1, sizeof(*saved_argv)); |
Damien Miller | e3fa20e | 2017-10-23 16:25:24 +1100 | [diff] [blame] | 1483 | for (i = 0; (int)i < ac; i++) |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 1484 | saved_argv[i] = xstrdup(av[i]); |
Damien Miller | 04cb536 | 2003-05-15 21:29:10 +1000 | [diff] [blame] | 1485 | saved_argv[i] = NULL; |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 1486 | |
| 1487 | #ifndef HAVE_SETPROCTITLE |
| 1488 | /* Prepare for later setproctitle emulation */ |
| 1489 | compat_init_setproctitle(ac, av); |
Damien Miller | f2e3e9d | 2003-06-02 12:15:54 +1000 | [diff] [blame] | 1490 | av = saved_argv; |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 1491 | #endif |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1492 | |
Damien Miller | bfba354 | 2004-03-22 09:29:57 +1100 | [diff] [blame] | 1493 | if (geteuid() == 0 && setgroups(0, NULL) == -1) |
| 1494 | debug("setgroups(): %.200s", strerror(errno)); |
| 1495 | |
Darren Tucker | ce321d8 | 2005-10-03 18:11:24 +1000 | [diff] [blame] | 1496 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
| 1497 | sanitise_stdfd(); |
| 1498 | |
Damien Miller | 42c5ec4 | 2018-11-23 10:40:06 +1100 | [diff] [blame] | 1499 | seed_rng(); |
| 1500 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1501 | /* Initialize configuration options to their default values. */ |
| 1502 | initialize_server_options(&options); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1503 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1504 | /* Parse command-line arguments. */ |
djm@openbsd.org | 3e91b4e | 2015-05-24 23:39:16 +0000 | [diff] [blame] | 1505 | while ((opt = getopt(ac, av, |
| 1506 | "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] | 1507 | switch (opt) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1508 | case '4': |
Darren Tucker | 0f38323 | 2005-01-20 10:57:56 +1100 | [diff] [blame] | 1509 | options.address_family = AF_INET; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1510 | break; |
| 1511 | case '6': |
Darren Tucker | 0f38323 | 2005-01-20 10:57:56 +1100 | [diff] [blame] | 1512 | options.address_family = AF_INET6; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1513 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1514 | case 'f': |
| 1515 | config_file_name = optarg; |
| 1516 | break; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1517 | case 'c': |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 1518 | servconf_add_hostcert("[command-line]", 0, |
| 1519 | &options, optarg); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1520 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1521 | case 'd': |
Darren Tucker | e98dfa3 | 2003-07-19 19:54:31 +1000 | [diff] [blame] | 1522 | if (debug_flag == 0) { |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1523 | debug_flag = 1; |
| 1524 | options.log_level = SYSLOG_LEVEL_DEBUG1; |
Darren Tucker | e98dfa3 | 2003-07-19 19:54:31 +1000 | [diff] [blame] | 1525 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1526 | options.log_level++; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1527 | break; |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 1528 | case 'D': |
| 1529 | no_daemon_flag = 1; |
| 1530 | break; |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 1531 | case 'E': |
dtucker@openbsd.org | 4f7cc2f | 2015-09-04 08:21:47 +0000 | [diff] [blame] | 1532 | logfile = optarg; |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 1533 | /* FALLTHROUGH */ |
Ben Lindstrom | 9fce9f0 | 2001-04-11 23:10:09 +0000 | [diff] [blame] | 1534 | case 'e': |
| 1535 | log_stderr = 1; |
| 1536 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1537 | case 'i': |
| 1538 | inetd_flag = 1; |
| 1539 | break; |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1540 | case 'r': |
| 1541 | rexec_flag = 0; |
| 1542 | break; |
| 1543 | case 'R': |
| 1544 | rexeced_flag = 1; |
| 1545 | inetd_flag = 1; |
| 1546 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1547 | case 'Q': |
Ben Lindstrom | d539020 | 2001-01-29 08:07:43 +0000 | [diff] [blame] | 1548 | /* ignored */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1549 | break; |
| 1550 | case 'q': |
| 1551 | options.log_level = SYSLOG_LEVEL_QUIET; |
| 1552 | break; |
| 1553 | case 'b': |
naddy@openbsd.org | c38ea63 | 2016-08-15 12:27:56 +0000 | [diff] [blame] | 1554 | /* protocol 1, ignored */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1555 | break; |
| 1556 | case 'p': |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1557 | options.ports_from_cmdline = 1; |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1558 | if (options.num_ports >= MAX_PORTS) { |
| 1559 | fprintf(stderr, "too many ports.\n"); |
| 1560 | exit(1); |
| 1561 | } |
Ben Lindstrom | 19066a1 | 2001-04-12 23:39:26 +0000 | [diff] [blame] | 1562 | options.ports[options.num_ports++] = a2port(optarg); |
Damien Miller | 3dc71ad | 2009-01-28 16:31:22 +1100 | [diff] [blame] | 1563 | if (options.ports[options.num_ports-1] <= 0) { |
Ben Lindstrom | 19066a1 | 2001-04-12 23:39:26 +0000 | [diff] [blame] | 1564 | fprintf(stderr, "Bad port number.\n"); |
| 1565 | exit(1); |
| 1566 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1567 | break; |
| 1568 | case 'g': |
Ben Lindstrom | 1bda4c8 | 2001-06-05 19:59:08 +0000 | [diff] [blame] | 1569 | if ((options.login_grace_time = convtime(optarg)) == -1) { |
| 1570 | fprintf(stderr, "Invalid login grace time.\n"); |
| 1571 | exit(1); |
| 1572 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1573 | break; |
| 1574 | case 'k': |
naddy@openbsd.org | c38ea63 | 2016-08-15 12:27:56 +0000 | [diff] [blame] | 1575 | /* protocol 1, ignored */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1576 | break; |
| 1577 | case 'h': |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 1578 | servconf_add_hostkey("[command-line]", 0, |
djm@openbsd.org | 928f123 | 2018-11-19 04:12:32 +0000 | [diff] [blame] | 1579 | &options, optarg, 1); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1580 | break; |
Ben Lindstrom | 794325a | 2001-08-06 21:09:07 +0000 | [diff] [blame] | 1581 | case 't': |
| 1582 | test_flag = 1; |
| 1583 | break; |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 1584 | case 'T': |
| 1585 | test_flag = 2; |
| 1586 | break; |
| 1587 | case 'C': |
djm@openbsd.org | 172a592 | 2019-01-19 21:37:48 +0000 | [diff] [blame] | 1588 | connection_info = get_connection_info(ssh, 0, 0); |
Darren Tucker | fbcf827 | 2012-05-19 19:37:01 +1000 | [diff] [blame] | 1589 | if (parse_server_match_testspec(connection_info, |
| 1590 | optarg) == -1) |
| 1591 | exit(1); |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 1592 | break; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 1593 | case 'u': |
deraadt@openbsd.org | 087266e | 2015-01-20 23:14:00 +0000 | [diff] [blame] | 1594 | utmp_len = (u_int)strtonum(optarg, 0, HOST_NAME_MAX+1+1, NULL); |
| 1595 | if (utmp_len > HOST_NAME_MAX+1) { |
Ben Lindstrom | 41daec7 | 2002-07-23 21:15:13 +0000 | [diff] [blame] | 1596 | fprintf(stderr, "Invalid utmp length.\n"); |
| 1597 | exit(1); |
| 1598 | } |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 1599 | break; |
Ben Lindstrom | ade03f6 | 2001-12-06 18:22:17 +0000 | [diff] [blame] | 1600 | case 'o': |
Damien Miller | b999719 | 2003-12-17 16:29:22 +1100 | [diff] [blame] | 1601 | line = xstrdup(optarg); |
| 1602 | if (process_server_config_line(&options, line, |
Darren Tucker | fbcf827 | 2012-05-19 19:37:01 +1000 | [diff] [blame] | 1603 | "command-line", 0, NULL, NULL) != 0) |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1604 | exit(1); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1605 | free(line); |
Ben Lindstrom | ade03f6 | 2001-12-06 18:22:17 +0000 | [diff] [blame] | 1606 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1607 | case '?': |
| 1608 | default: |
Ben Lindstrom | ade03f6 | 2001-12-06 18:22:17 +0000 | [diff] [blame] | 1609 | usage(); |
| 1610 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1611 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1612 | } |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1613 | if (rexeced_flag || inetd_flag) |
| 1614 | rexec_flag = 0; |
djm@openbsd.org | 2a35862 | 2018-11-16 03:26:01 +0000 | [diff] [blame] | 1615 | if (!test_flag && rexec_flag && !path_absolute(av[0])) |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1616 | fatal("sshd re-exec requires execution with an absolute path"); |
| 1617 | if (rexeced_flag) |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 1618 | closefrom(REEXEC_MIN_FREE_FD); |
| 1619 | else |
| 1620 | closefrom(REEXEC_DEVCRYPTO_RESERVED_FD); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1621 | |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 1622 | /* If requested, redirect the logs to the specified logfile. */ |
dtucker@openbsd.org | 4f7cc2f | 2015-09-04 08:21:47 +0000 | [diff] [blame] | 1623 | if (logfile != NULL) |
Damien Miller | 03d4d7e | 2013-04-23 15:21:06 +1000 | [diff] [blame] | 1624 | log_redirect_stderr_to(logfile); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1625 | /* |
| 1626 | * Force logging to stderr until we have loaded the private host |
| 1627 | * key (unless started from inetd) |
| 1628 | */ |
Kevin Steves | ec84dc1 | 2000-12-13 17:45:15 +0000 | [diff] [blame] | 1629 | log_init(__progname, |
Damien Miller | 5aa5d78 | 2002-02-08 22:01:54 +1100 | [diff] [blame] | 1630 | options.log_level == SYSLOG_LEVEL_NOT_SET ? |
| 1631 | SYSLOG_LEVEL_INFO : options.log_level, |
| 1632 | options.log_facility == SYSLOG_FACILITY_NOT_SET ? |
| 1633 | SYSLOG_FACILITY_AUTH : options.log_facility, |
Ben Lindstrom | c2faa4a | 2002-11-09 15:50:03 +0000 | [diff] [blame] | 1634 | log_stderr || !inetd_flag); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1635 | |
Darren Tucker | 86c093d | 2004-03-08 22:59:03 +1100 | [diff] [blame] | 1636 | /* |
| 1637 | * Unset KRB5CCNAME, otherwise the user's session may inherit it from |
| 1638 | * root's environment |
Damien Miller | 94cf4c8 | 2005-07-17 17:04:47 +1000 | [diff] [blame] | 1639 | */ |
Darren Tucker | 9dc6c7d | 2005-02-02 18:30:33 +1100 | [diff] [blame] | 1640 | if (getenv("KRB5CCNAME") != NULL) |
Tim Rice | e3609c9 | 2012-02-14 10:03:30 -0800 | [diff] [blame] | 1641 | (void) unsetenv("KRB5CCNAME"); |
Darren Tucker | 9dc6c7d | 2005-02-02 18:30:33 +1100 | [diff] [blame] | 1642 | |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1643 | sensitive_data.have_ssh2_key = 0; |
| 1644 | |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 1645 | /* |
dtucker@openbsd.org@openbsd.org | 0208a48 | 2017-11-03 03:18:53 +0000 | [diff] [blame] | 1646 | * If we're not doing an extended test do not silently ignore connection |
| 1647 | * test params. |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 1648 | */ |
dtucker@openbsd.org@openbsd.org | 0208a48 | 2017-11-03 03:18:53 +0000 | [diff] [blame] | 1649 | if (test_flag < 2 && connection_info != NULL) |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 1650 | fatal("Config test connection parameter (-C) provided without " |
| 1651 | "test mode (-T)"); |
| 1652 | |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1653 | /* Fetch our configuration */ |
markus@openbsd.org | c3cb779 | 2018-07-09 21:29:36 +0000 | [diff] [blame] | 1654 | if ((cfg = sshbuf_new()) == NULL) |
| 1655 | fatal("%s: sshbuf_new failed", __func__); |
djm@openbsd.org | 76a24b3 | 2019-03-01 02:32:39 +0000 | [diff] [blame] | 1656 | if (rexeced_flag) { |
markus@openbsd.org | c3cb779 | 2018-07-09 21:29:36 +0000 | [diff] [blame] | 1657 | recv_rexec_state(REEXEC_CONFIG_PASS_FD, cfg); |
djm@openbsd.org | 76a24b3 | 2019-03-01 02:32:39 +0000 | [diff] [blame] | 1658 | if (!debug_flag) { |
| 1659 | startup_pipe = dup(REEXEC_STARTUP_PIPE_FD); |
| 1660 | close(REEXEC_STARTUP_PIPE_FD); |
| 1661 | /* |
| 1662 | * Signal parent that this child is at a point where |
| 1663 | * they can go away if they have a SIGHUP pending. |
| 1664 | */ |
| 1665 | (void)atomicio(vwrite, startup_pipe, "\0", 1); |
| 1666 | } |
| 1667 | } |
djm@openbsd.org | dbcc652 | 2015-04-27 00:21:21 +0000 | [diff] [blame] | 1668 | else if (strcasecmp(config_file_name, "none") != 0) |
markus@openbsd.org | c3cb779 | 2018-07-09 21:29:36 +0000 | [diff] [blame] | 1669 | load_server_config(config_file_name, cfg); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1670 | |
Darren Tucker | 4515047 | 2006-07-12 22:34:17 +1000 | [diff] [blame] | 1671 | parse_server_config(&options, rexeced_flag ? "rexec" : config_file_name, |
markus@openbsd.org | c3cb779 | 2018-07-09 21:29:36 +0000 | [diff] [blame] | 1672 | cfg, NULL); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1673 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1674 | /* Fill in default values for those options not explicitly set. */ |
| 1675 | fill_default_server_options(&options); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1676 | |
Darren Tucker | 97b1bb5 | 2007-03-21 20:38:53 +1100 | [diff] [blame] | 1677 | /* challenge-response is implemented via keyboard interactive */ |
| 1678 | if (options.challenge_response_authentication) |
| 1679 | options.kbd_interactive_authentication = 1; |
| 1680 | |
Damien Miller | d0d1099 | 2012-11-04 22:23:14 +1100 | [diff] [blame] | 1681 | /* Check that options are sensible */ |
| 1682 | if (options.authorized_keys_command_user == NULL && |
| 1683 | (options.authorized_keys_command != NULL && |
| 1684 | strcasecmp(options.authorized_keys_command, "none") != 0)) |
| 1685 | fatal("AuthorizedKeysCommand set without " |
| 1686 | "AuthorizedKeysCommandUser"); |
djm@openbsd.org | bcc50d8 | 2015-05-21 06:43:30 +0000 | [diff] [blame] | 1687 | if (options.authorized_principals_command_user == NULL && |
| 1688 | (options.authorized_principals_command != NULL && |
| 1689 | strcasecmp(options.authorized_principals_command, "none") != 0)) |
| 1690 | fatal("AuthorizedPrincipalsCommand set without " |
| 1691 | "AuthorizedPrincipalsCommandUser"); |
Damien Miller | d0d1099 | 2012-11-04 22:23:14 +1100 | [diff] [blame] | 1692 | |
Damien Miller | a6e3f01 | 2012-11-04 23:21:40 +1100 | [diff] [blame] | 1693 | /* |
| 1694 | * Check whether there is any path through configured auth methods. |
| 1695 | * Unfortunately it is not possible to verify this generally before |
| 1696 | * daemonisation in the presence of Match block, but this catches |
| 1697 | * and warns for trivial misconfigurations that could break login. |
| 1698 | */ |
| 1699 | if (options.num_auth_methods != 0) { |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 1700 | for (i = 0; i < options.num_auth_methods; i++) { |
| 1701 | if (auth2_methods_valid(options.auth_methods[i], |
Damien Miller | a6e3f01 | 2012-11-04 23:21:40 +1100 | [diff] [blame] | 1702 | 1) == 0) |
| 1703 | break; |
| 1704 | } |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 1705 | if (i >= options.num_auth_methods) |
Damien Miller | a6e3f01 | 2012-11-04 23:21:40 +1100 | [diff] [blame] | 1706 | fatal("AuthenticationMethods cannot be satisfied by " |
| 1707 | "enabled authentication methods"); |
| 1708 | } |
| 1709 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1710 | /* Check that there are no remaining arguments. */ |
| 1711 | if (optind < ac) { |
| 1712 | fprintf(stderr, "Extra argument %s.\n", av[optind]); |
| 1713 | exit(1); |
| 1714 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1715 | |
Damien Miller | 22e8a1e | 2013-02-12 11:04:48 +1100 | [diff] [blame] | 1716 | debug("sshd version %s, %s", SSH_VERSION, |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 1717 | #ifdef WITH_OPENSSL |
djm@openbsd.org | a65784c | 2018-10-23 05:56:35 +0000 | [diff] [blame] | 1718 | OpenSSL_version(OPENSSL_VERSION) |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 1719 | #else |
| 1720 | "without OpenSSL" |
| 1721 | #endif |
| 1722 | ); |
Damien Miller | 2ccf661 | 1999-11-15 15:25:10 +1100 | [diff] [blame] | 1723 | |
Darren Tucker | df0e438 | 2006-11-07 11:28:40 +1100 | [diff] [blame] | 1724 | /* Store privilege separation user for later use if required. */ |
Darren Tucker | d13281f | 2017-03-29 12:39:39 +1100 | [diff] [blame] | 1725 | privsep_chroot = use_privsep && (getuid() == 0 || geteuid() == 0); |
Darren Tucker | df0e438 | 2006-11-07 11:28:40 +1100 | [diff] [blame] | 1726 | if ((privsep_pw = getpwnam(SSH_PRIVSEP_USER)) == NULL) { |
Darren Tucker | d13281f | 2017-03-29 12:39:39 +1100 | [diff] [blame] | 1727 | if (privsep_chroot || options.kerberos_authentication) |
Darren Tucker | df0e438 | 2006-11-07 11:28:40 +1100 | [diff] [blame] | 1728 | fatal("Privilege separation user %s does not exist", |
| 1729 | SSH_PRIVSEP_USER); |
| 1730 | } else { |
Darren Tucker | df0e438 | 2006-11-07 11:28:40 +1100 | [diff] [blame] | 1731 | privsep_pw = pwcopy(privsep_pw); |
djm@openbsd.org | d6364f6 | 2018-01-23 05:01:15 +0000 | [diff] [blame] | 1732 | freezero(privsep_pw->pw_passwd, strlen(privsep_pw->pw_passwd)); |
Darren Tucker | df0e438 | 2006-11-07 11:28:40 +1100 | [diff] [blame] | 1733 | privsep_pw->pw_passwd = xstrdup("*"); |
| 1734 | } |
Damien Miller | 6433df0 | 2006-09-07 10:36:43 +1000 | [diff] [blame] | 1735 | endpwent(); |
| 1736 | |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1737 | /* load host keys */ |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 1738 | sensitive_data.host_keys = xcalloc(options.num_host_key_files, |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 1739 | sizeof(struct sshkey *)); |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1740 | sensitive_data.host_pubkeys = xcalloc(options.num_host_key_files, |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 1741 | sizeof(struct sshkey *)); |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1742 | |
| 1743 | if (options.host_key_agent) { |
| 1744 | if (strcmp(options.host_key_agent, SSH_AUTHSOCKET_ENV_NAME)) |
| 1745 | setenv(SSH_AUTHSOCKET_ENV_NAME, |
| 1746 | options.host_key_agent, 1); |
djm@openbsd.org | 83f8ffa | 2015-01-17 18:53:34 +0000 | [diff] [blame] | 1747 | if ((r = ssh_get_authentication_socket(NULL)) == 0) |
| 1748 | have_agent = 1; |
| 1749 | else |
| 1750 | error("Could not connect to agent \"%s\": %s", |
| 1751 | options.host_key_agent, ssh_err(r)); |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1752 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1753 | |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1754 | for (i = 0; i < options.num_host_key_files; i++) { |
djm@openbsd.org | 928f123 | 2018-11-19 04:12:32 +0000 | [diff] [blame] | 1755 | int ll = options.host_key_file_userprovided[i] ? |
| 1756 | SYSLOG_LEVEL_ERROR : SYSLOG_LEVEL_DEBUG1; |
| 1757 | |
djm@openbsd.org | 161cf41 | 2014-12-22 07:55:51 +0000 | [diff] [blame] | 1758 | if (options.host_key_files[i] == NULL) |
| 1759 | continue; |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1760 | if ((r = sshkey_load_private(options.host_key_files[i], "", |
| 1761 | &key, NULL)) != 0 && r != SSH_ERR_SYSTEM_ERROR) |
djm@openbsd.org | 928f123 | 2018-11-19 04:12:32 +0000 | [diff] [blame] | 1762 | do_log2(ll, "Unable to load host key \"%s\": %s", |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1763 | options.host_key_files[i], ssh_err(r)); |
djm@openbsd.org | 56584cc | 2019-12-15 18:57:30 +0000 | [diff] [blame] | 1764 | if (sshkey_is_sk(key) && |
| 1765 | key->sk_flags & SSH_SK_USER_PRESENCE_REQD) { |
| 1766 | debug("host key %s requires user presence, ignoring", |
| 1767 | options.host_key_files[i]); |
| 1768 | key->sk_flags &= ~SSH_SK_USER_PRESENCE_REQD; |
| 1769 | } |
| 1770 | if (r == 0 && key != NULL && |
| 1771 | (r = sshkey_shield_private(key)) != 0) { |
djm@openbsd.org | 4f7a56d | 2019-06-21 04:21:04 +0000 | [diff] [blame] | 1772 | do_log2(ll, "Unable to shield host key \"%s\": %s", |
| 1773 | options.host_key_files[i], ssh_err(r)); |
| 1774 | sshkey_free(key); |
| 1775 | key = NULL; |
| 1776 | } |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1777 | if ((r = sshkey_load_public(options.host_key_files[i], |
| 1778 | &pubkey, NULL)) != 0 && r != SSH_ERR_SYSTEM_ERROR) |
djm@openbsd.org | 928f123 | 2018-11-19 04:12:32 +0000 | [diff] [blame] | 1779 | do_log2(ll, "Unable to load host key \"%s\": %s", |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1780 | options.host_key_files[i], ssh_err(r)); |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 1781 | if (pubkey == NULL && key != NULL) |
djm@openbsd.org | 482d23b | 2018-09-13 02:08:33 +0000 | [diff] [blame] | 1782 | if ((r = sshkey_from_private(key, &pubkey)) != 0) |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1783 | fatal("Could not demote key: \"%s\": %s", |
| 1784 | options.host_key_files[i], ssh_err(r)); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 1785 | sensitive_data.host_keys[i] = key; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1786 | sensitive_data.host_pubkeys[i] = pubkey; |
| 1787 | |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 1788 | if (key == NULL && pubkey != NULL && have_agent) { |
djm@openbsd.org | ce63c4b | 2015-02-16 22:30:03 +0000 | [diff] [blame] | 1789 | debug("will rely on agent for hostkey %s", |
| 1790 | options.host_key_files[i]); |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1791 | keytype = pubkey->type; |
| 1792 | } else if (key != NULL) { |
| 1793 | keytype = key->type; |
markus@openbsd.org | c3cb779 | 2018-07-09 21:29:36 +0000 | [diff] [blame] | 1794 | accumulate_host_timing_secret(cfg, key); |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1795 | } else { |
djm@openbsd.org | 928f123 | 2018-11-19 04:12:32 +0000 | [diff] [blame] | 1796 | do_log2(ll, "Unable to load host key: %s", |
Ben Lindstrom | 15f3386 | 2001-04-16 02:00:02 +0000 | [diff] [blame] | 1797 | options.host_key_files[i]); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 1798 | sensitive_data.host_keys[i] = NULL; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1799 | sensitive_data.host_pubkeys[i] = NULL; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1800 | continue; |
| 1801 | } |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1802 | |
| 1803 | switch (keytype) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1804 | case KEY_RSA: |
| 1805 | case KEY_DSA: |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 1806 | case KEY_ECDSA: |
Damien Miller | 5be9d9e | 2013-12-07 11:24:01 +1100 | [diff] [blame] | 1807 | case KEY_ED25519: |
djm@openbsd.org | 56584cc | 2019-12-15 18:57:30 +0000 | [diff] [blame] | 1808 | case KEY_ECDSA_SK: |
| 1809 | case KEY_ED25519_SK: |
markus@openbsd.org | 1b11ea7 | 2018-02-23 15:58:37 +0000 | [diff] [blame] | 1810 | case KEY_XMSS: |
djm@openbsd.org | 6049a54 | 2015-01-31 20:30:05 +0000 | [diff] [blame] | 1811 | if (have_agent || key != NULL) |
| 1812 | sensitive_data.have_ssh2_key = 1; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1813 | break; |
| 1814 | } |
djm@openbsd.org | 6049a54 | 2015-01-31 20:30:05 +0000 | [diff] [blame] | 1815 | if ((fp = sshkey_fingerprint(pubkey, options.fingerprint_hash, |
| 1816 | SSH_FP_DEFAULT)) == NULL) |
| 1817 | fatal("sshkey_fingerprint failed"); |
| 1818 | debug("%s host key #%d: %s %s", |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 1819 | key ? "private" : "agent", i, sshkey_ssh_name(pubkey), fp); |
djm@openbsd.org | 6049a54 | 2015-01-31 20:30:05 +0000 | [diff] [blame] | 1820 | free(fp); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1821 | } |
markus@openbsd.org | c3cb779 | 2018-07-09 21:29:36 +0000 | [diff] [blame] | 1822 | accumulate_host_timing_secret(cfg, NULL); |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 1823 | if (!sensitive_data.have_ssh2_key) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1824 | logit("sshd: no hostkeys available -- exiting."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1825 | exit(1); |
| 1826 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1827 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1828 | /* |
| 1829 | * Load certificates. They are stored in an array at identical |
| 1830 | * indices to the public keys that they relate to. |
| 1831 | */ |
| 1832 | sensitive_data.host_certificates = xcalloc(options.num_host_key_files, |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 1833 | sizeof(struct sshkey *)); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1834 | for (i = 0; i < options.num_host_key_files; i++) |
| 1835 | sensitive_data.host_certificates[i] = NULL; |
| 1836 | |
| 1837 | for (i = 0; i < options.num_host_cert_files; i++) { |
djm@openbsd.org | 161cf41 | 2014-12-22 07:55:51 +0000 | [diff] [blame] | 1838 | if (options.host_cert_files[i] == NULL) |
| 1839 | continue; |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1840 | if ((r = sshkey_load_public(options.host_cert_files[i], |
| 1841 | &key, NULL)) != 0) { |
| 1842 | error("Could not load host certificate \"%s\": %s", |
| 1843 | options.host_cert_files[i], ssh_err(r)); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1844 | continue; |
| 1845 | } |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1846 | if (!sshkey_is_cert(key)) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1847 | error("Certificate file is not a certificate: %s", |
| 1848 | options.host_cert_files[i]); |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1849 | sshkey_free(key); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1850 | continue; |
| 1851 | } |
| 1852 | /* Find matching private key */ |
| 1853 | for (j = 0; j < options.num_host_key_files; j++) { |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1854 | if (sshkey_equal_public(key, |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1855 | sensitive_data.host_keys[j])) { |
| 1856 | sensitive_data.host_certificates[j] = key; |
| 1857 | break; |
| 1858 | } |
| 1859 | } |
| 1860 | if (j >= options.num_host_key_files) { |
| 1861 | error("No matching private key for certificate: %s", |
| 1862 | options.host_cert_files[i]); |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1863 | sshkey_free(key); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1864 | continue; |
| 1865 | } |
| 1866 | sensitive_data.host_certificates[j] = key; |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 1867 | debug("host certificate: #%u type %d %s", j, key->type, |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1868 | sshkey_type(key)); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1869 | } |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 1870 | |
Darren Tucker | d13281f | 2017-03-29 12:39:39 +1100 | [diff] [blame] | 1871 | if (privsep_chroot) { |
Ben Lindstrom | a26ea63 | 2002-06-06 20:46:25 +0000 | [diff] [blame] | 1872 | struct stat st; |
| 1873 | |
Ben Lindstrom | a26ea63 | 2002-06-06 20:46:25 +0000 | [diff] [blame] | 1874 | if ((stat(_PATH_PRIVSEP_CHROOT_DIR, &st) == -1) || |
| 1875 | (S_ISDIR(st.st_mode) == 0)) |
| 1876 | fatal("Missing privilege separation directory: %s", |
| 1877 | _PATH_PRIVSEP_CHROOT_DIR); |
Ben Lindstrom | 5962735 | 2002-06-27 18:02:21 +0000 | [diff] [blame] | 1878 | |
| 1879 | #ifdef HAVE_CYGWIN |
| 1880 | if (check_ntsec(_PATH_PRIVSEP_CHROOT_DIR) && |
| 1881 | (st.st_uid != getuid () || |
| 1882 | (st.st_mode & (S_IWGRP|S_IWOTH)) != 0)) |
| 1883 | #else |
Ben Lindstrom | 2dfacb3 | 2002-06-23 00:33:47 +0000 | [diff] [blame] | 1884 | 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] | 1885 | #endif |
Damien Miller | 180fc5b | 2003-02-24 11:50:18 +1100 | [diff] [blame] | 1886 | fatal("%s must be owned by root and not group or " |
| 1887 | "world-writable.", _PATH_PRIVSEP_CHROOT_DIR); |
Ben Lindstrom | a26ea63 | 2002-06-06 20:46:25 +0000 | [diff] [blame] | 1888 | } |
| 1889 | |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 1890 | if (test_flag > 1) { |
djm@openbsd.org@openbsd.org | 548d3a6 | 2017-11-14 00:45:29 +0000 | [diff] [blame] | 1891 | /* |
| 1892 | * If no connection info was provided by -C then use |
| 1893 | * use a blank one that will cause no predicate to match. |
| 1894 | */ |
| 1895 | if (connection_info == NULL) |
djm@openbsd.org | 172a592 | 2019-01-19 21:37:48 +0000 | [diff] [blame] | 1896 | connection_info = get_connection_info(ssh, 0, 0); |
dtucker@openbsd.org | e826bbc | 2019-04-18 18:56:16 +0000 | [diff] [blame] | 1897 | connection_info->test = 1; |
dtucker@openbsd.org@openbsd.org | 0208a48 | 2017-11-03 03:18:53 +0000 | [diff] [blame] | 1898 | parse_server_match_config(&options, connection_info); |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 1899 | dump_config(&options); |
| 1900 | } |
| 1901 | |
Ben Lindstrom | 794325a | 2001-08-06 21:09:07 +0000 | [diff] [blame] | 1902 | /* Configuration looks good, so exit if in test mode. */ |
| 1903 | if (test_flag) |
| 1904 | exit(0); |
| 1905 | |
Damien Miller | 87aea25 | 2002-05-10 12:20:24 +1000 | [diff] [blame] | 1906 | /* |
| 1907 | * Clear out any supplemental groups we may have inherited. This |
| 1908 | * prevents inadvertent creation of files with bad modes (in the |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 1909 | * portable version at least, it's certainly possible for PAM |
| 1910 | * 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] | 1911 | * module which might be used). |
| 1912 | */ |
| 1913 | if (setgroups(0, NULL) < 0) |
| 1914 | debug("setgroups() failed: %.200s", strerror(errno)); |
| 1915 | |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1916 | if (rexec_flag) { |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 1917 | if (rexec_argc < 0) |
| 1918 | fatal("rexec_argc %d < 0", rexec_argc); |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 1919 | rexec_argv = xcalloc(rexec_argc + 2, sizeof(char *)); |
djm@openbsd.org | dceabc7 | 2017-10-05 15:52:03 +0000 | [diff] [blame] | 1920 | for (i = 0; i < (u_int)rexec_argc; i++) { |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1921 | debug("rexec_argv[%d]='%s'", i, saved_argv[i]); |
| 1922 | rexec_argv[i] = saved_argv[i]; |
| 1923 | } |
| 1924 | rexec_argv[rexec_argc] = "-R"; |
| 1925 | rexec_argv[rexec_argc + 1] = NULL; |
| 1926 | } |
djm@openbsd.org | a8c05c6 | 2020-01-24 23:56:01 +0000 | [diff] [blame] | 1927 | listener_proctitle = prepare_proctitle(ac, av); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 1928 | |
Damien Miller | 6ca16c6 | 2008-06-16 07:50:58 +1000 | [diff] [blame] | 1929 | /* Ensure that umask disallows at least group and world write */ |
| 1930 | new_umask = umask(0077) | 0022; |
| 1931 | (void) umask(new_umask); |
| 1932 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1933 | /* Initialize the log (it is reinitialized below in case we forked). */ |
Darren Tucker | ea7c812 | 2005-01-20 11:03:08 +1100 | [diff] [blame] | 1934 | if (debug_flag && (!inetd_flag || rexeced_flag)) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1935 | log_stderr = 1; |
Kevin Steves | ec84dc1 | 2000-12-13 17:45:15 +0000 | [diff] [blame] | 1936 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1937 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1938 | /* |
dtucker@openbsd.org | 7fc4766 | 2016-11-30 00:28:31 +0000 | [diff] [blame] | 1939 | * If not in debugging mode, not started from inetd and not already |
| 1940 | * daemonized (eg re-exec via SIGHUP), disconnect from the controlling |
| 1941 | * terminal, and fork. The original process exits. |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1942 | */ |
dtucker@openbsd.org | 7fc4766 | 2016-11-30 00:28:31 +0000 | [diff] [blame] | 1943 | already_daemon = daemonized(); |
| 1944 | if (!(debug_flag || inetd_flag || no_daemon_flag || already_daemon)) { |
dtucker@openbsd.org | b0899ee | 2016-11-29 03:54:50 +0000 | [diff] [blame] | 1945 | |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 1946 | if (daemon(0, 0) == -1) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1947 | fatal("daemon() failed: %.200s", strerror(errno)); |
| 1948 | |
dtucker@openbsd.org | b0899ee | 2016-11-29 03:54:50 +0000 | [diff] [blame] | 1949 | disconnect_controlling_tty(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1950 | } |
| 1951 | /* Reinitialize the log (because of the fork above). */ |
Kevin Steves | ec84dc1 | 2000-12-13 17:45:15 +0000 | [diff] [blame] | 1952 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1953 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1954 | /* Chdir to the root directory so that the current disk can be |
| 1955 | unmounted if desired. */ |
Darren Tucker | dbee308 | 2013-05-16 20:32:29 +1000 | [diff] [blame] | 1956 | if (chdir("/") == -1) |
| 1957 | error("chdir(\"/\"): %s", strerror(errno)); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1958 | |
Ben Lindstrom | de71cda | 2001-03-24 00:43:26 +0000 | [diff] [blame] | 1959 | /* ignore SIGPIPE */ |
dtucker@openbsd.org | 3bf2a6a | 2020-01-23 07:10:22 +0000 | [diff] [blame] | 1960 | ssh_signal(SIGPIPE, SIG_IGN); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1961 | |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1962 | /* Get a connection, either from inetd or a listening TCP socket */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1963 | if (inetd_flag) { |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1964 | server_accept_inetd(&sock_in, &sock_out); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1965 | } else { |
Darren Tucker | c8802aa | 2009-12-08 13:39:48 +1100 | [diff] [blame] | 1966 | platform_pre_listen(); |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1967 | server_listen(); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1968 | |
dtucker@openbsd.org | 3bf2a6a | 2020-01-23 07:10:22 +0000 | [diff] [blame] | 1969 | ssh_signal(SIGHUP, sighup_handler); |
| 1970 | ssh_signal(SIGCHLD, main_sigchld_handler); |
| 1971 | ssh_signal(SIGTERM, sigterm_handler); |
| 1972 | ssh_signal(SIGQUIT, sigterm_handler); |
Ben Lindstrom | 9809786 | 2001-06-25 05:10:20 +0000 | [diff] [blame] | 1973 | |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1974 | /* |
| 1975 | * Write out the pid file after the sigterm handler |
| 1976 | * is setup and the listen sockets are bound |
| 1977 | */ |
dtucker@openbsd.org | f2398eb | 2016-12-04 22:27:25 +0000 | [diff] [blame] | 1978 | if (options.pid_file != NULL && !debug_flag) { |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1979 | FILE *f = fopen(options.pid_file, "w"); |
| 1980 | |
Darren Tucker | e532704 | 2003-07-03 13:40:44 +1000 | [diff] [blame] | 1981 | if (f == NULL) { |
| 1982 | error("Couldn't create pid file \"%s\": %s", |
| 1983 | options.pid_file, strerror(errno)); |
| 1984 | } else { |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1985 | fprintf(f, "%ld\n", (long) getpid()); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1986 | fclose(f); |
| 1987 | } |
| 1988 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1989 | |
Damien Miller | a1f6840 | 2006-08-19 00:31:39 +1000 | [diff] [blame] | 1990 | /* Accept a connection and return in a forked child */ |
| 1991 | server_accept_loop(&sock_in, &sock_out, |
| 1992 | &newsock, config_s); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1993 | } |
| 1994 | |
| 1995 | /* This is the child processing a new connection. */ |
Damien Miller | 57aae98 | 2004-03-08 23:11:25 +1100 | [diff] [blame] | 1996 | setproctitle("%s", "[accepted]"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1997 | |
Darren Tucker | 6832b83 | 2004-08-12 22:36:51 +1000 | [diff] [blame] | 1998 | /* |
| 1999 | * Create a new session and process group since the 4.4BSD |
| 2000 | * setlogin() affects the entire process group. We don't |
| 2001 | * want the child to be able to affect the parent. |
| 2002 | */ |
| 2003 | #if !defined(SSHD_ACQUIRES_CTTY) |
| 2004 | /* |
| 2005 | * If setsid is called, on some platforms sshd will later acquire a |
| 2006 | * controlling terminal which will result in "could not set |
| 2007 | * controlling tty" errors. |
| 2008 | */ |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 2009 | if (!debug_flag && !inetd_flag && setsid() == -1) |
Darren Tucker | 6832b83 | 2004-08-12 22:36:51 +1000 | [diff] [blame] | 2010 | error("setsid: %.100s", strerror(errno)); |
| 2011 | #endif |
| 2012 | |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 2013 | if (rexec_flag) { |
| 2014 | int fd; |
| 2015 | |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 2016 | debug("rexec start in %d out %d newsock %d pipe %d sock %d", |
| 2017 | sock_in, sock_out, newsock, startup_pipe, config_s[0]); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 2018 | dup2(newsock, STDIN_FILENO); |
| 2019 | dup2(STDIN_FILENO, STDOUT_FILENO); |
| 2020 | if (startup_pipe == -1) |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 2021 | close(REEXEC_STARTUP_PIPE_FD); |
Damien Miller | 61ee4d6 | 2013-10-15 11:56:47 +1100 | [diff] [blame] | 2022 | else if (startup_pipe != REEXEC_STARTUP_PIPE_FD) { |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 2023 | dup2(startup_pipe, REEXEC_STARTUP_PIPE_FD); |
Damien Miller | 61ee4d6 | 2013-10-15 11:56:47 +1100 | [diff] [blame] | 2024 | close(startup_pipe); |
| 2025 | startup_pipe = REEXEC_STARTUP_PIPE_FD; |
| 2026 | } |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 2027 | |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 2028 | dup2(config_s[1], REEXEC_CONFIG_PASS_FD); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 2029 | close(config_s[1]); |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 2030 | |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 2031 | execv(rexec_argv[0], rexec_argv); |
| 2032 | |
| 2033 | /* Reexec has failed, fall back and continue */ |
| 2034 | error("rexec of %s failed: %s", rexec_argv[0], strerror(errno)); |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 2035 | recv_rexec_state(REEXEC_CONFIG_PASS_FD, NULL); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 2036 | log_init(__progname, options.log_level, |
| 2037 | options.log_facility, log_stderr); |
| 2038 | |
| 2039 | /* Clean up fds */ |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 2040 | close(REEXEC_CONFIG_PASS_FD); |
| 2041 | newsock = sock_out = sock_in = dup(STDIN_FILENO); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 2042 | if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { |
| 2043 | dup2(fd, STDIN_FILENO); |
| 2044 | dup2(fd, STDOUT_FILENO); |
| 2045 | if (fd > STDERR_FILENO) |
| 2046 | close(fd); |
| 2047 | } |
Damien Miller | 035a5b4 | 2004-06-26 08:16:31 +1000 | [diff] [blame] | 2048 | debug("rexec cleanup in %d out %d newsock %d pipe %d sock %d", |
| 2049 | sock_in, sock_out, newsock, startup_pipe, config_s[0]); |
Darren Tucker | 645ab75 | 2004-06-25 13:33:20 +1000 | [diff] [blame] | 2050 | } |
| 2051 | |
Damien Miller | 133d9d3 | 2010-01-30 17:30:04 +1100 | [diff] [blame] | 2052 | /* Executed child processes don't need these. */ |
| 2053 | fcntl(sock_out, F_SETFD, FD_CLOEXEC); |
| 2054 | fcntl(sock_in, F_SETFD, FD_CLOEXEC); |
| 2055 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2056 | /* |
| 2057 | * Disable the key regeneration alarm. We will not regenerate the |
| 2058 | * key since we are no longer in a position to give it to anyone. We |
| 2059 | * will not restart on SIGHUP since it no longer makes sense. |
| 2060 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2061 | alarm(0); |
dtucker@openbsd.org | 3bf2a6a | 2020-01-23 07:10:22 +0000 | [diff] [blame] | 2062 | ssh_signal(SIGALRM, SIG_DFL); |
| 2063 | ssh_signal(SIGHUP, SIG_DFL); |
| 2064 | ssh_signal(SIGTERM, SIG_DFL); |
| 2065 | ssh_signal(SIGQUIT, SIG_DFL); |
| 2066 | ssh_signal(SIGCHLD, SIG_DFL); |
| 2067 | ssh_signal(SIGINT, SIG_DFL); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2068 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2069 | /* |
| 2070 | * Register our connection. This turns encryption off because we do |
| 2071 | * not have a key. |
| 2072 | */ |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 2073 | if ((ssh = ssh_packet_set_connection(NULL, sock_in, sock_out)) == NULL) |
| 2074 | fatal("Unable to create connection"); |
djm@openbsd.org | 04c091f | 2019-01-19 21:43:56 +0000 | [diff] [blame] | 2075 | the_active_state = ssh; |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 2076 | ssh_packet_set_server(ssh); |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 2077 | |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 2078 | check_ip_options(ssh); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2079 | |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 2080 | /* Prepare the channels layer */ |
| 2081 | channel_init_channels(ssh); |
| 2082 | channel_set_af(ssh, options.address_family); |
| 2083 | process_permitopen(ssh, &options); |
| 2084 | |
Damien Miller | 4f1d6b2 | 2005-05-26 11:59:32 +1000 | [diff] [blame] | 2085 | /* Set SO_KEEPALIVE if requested. */ |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 2086 | if (options.tcp_keep_alive && ssh_packet_connection_is_on_socket(ssh) && |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 2087 | setsockopt(sock_in, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on)) == -1) |
Damien Miller | 4f1d6b2 | 2005-05-26 11:59:32 +1000 | [diff] [blame] | 2088 | error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno)); |
| 2089 | |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 2090 | if ((remote_port = ssh_remote_port(ssh)) < 0) { |
| 2091 | debug("ssh_remote_port failed"); |
Damien Miller | 677257f | 2005-06-17 12:55:03 +1000 | [diff] [blame] | 2092 | cleanup_exit(255); |
| 2093 | } |
Damien Miller | 4d3fd54 | 2005-11-05 15:13:24 +1100 | [diff] [blame] | 2094 | |
djm@openbsd.org | 35eb33f | 2017-10-25 00:17:08 +0000 | [diff] [blame] | 2095 | if (options.routing_domain != NULL) |
| 2096 | set_process_rdomain(ssh, options.routing_domain); |
| 2097 | |
Damien Miller | 4d3fd54 | 2005-11-05 15:13:24 +1100 | [diff] [blame] | 2098 | /* |
Damien Miller | eb13e55 | 2006-06-13 13:03:53 +1000 | [diff] [blame] | 2099 | * The rest of the code depends on the fact that |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 2100 | * ssh_remote_ipaddr() caches the remote ip, even if |
Damien Miller | eb13e55 | 2006-06-13 13:03:53 +1000 | [diff] [blame] | 2101 | * the socket goes away. |
| 2102 | */ |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 2103 | remote_ip = ssh_remote_ipaddr(ssh); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2104 | |
Darren Tucker | 2e0cf0d | 2005-02-08 21:52:47 +1100 | [diff] [blame] | 2105 | #ifdef SSH_AUDIT_EVENTS |
Darren Tucker | 269a1ea | 2005-02-03 00:20:53 +1100 | [diff] [blame] | 2106 | audit_connection_from(remote_ip, remote_port); |
| 2107 | #endif |
Damien Miller | 6a4a4b9 | 2001-11-12 11:07:11 +1100 | [diff] [blame] | 2108 | |
djm@openbsd.org | 68af80e | 2017-10-25 00:19:47 +0000 | [diff] [blame] | 2109 | rdomain = ssh_packet_rdomain_in(ssh); |
| 2110 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2111 | /* Log the connection. */ |
dtucker@openbsd.org | 15fdfc9 | 2015-04-15 23:23:25 +0000 | [diff] [blame] | 2112 | laddr = get_local_ipaddr(sock_in); |
djm@openbsd.org@openbsd.org | b77c29a | 2017-10-27 00:18:41 +0000 | [diff] [blame] | 2113 | verbose("Connection from %s port %d on %s port %d%s%s%s", |
djm@openbsd.org | 68af80e | 2017-10-25 00:19:47 +0000 | [diff] [blame] | 2114 | remote_ip, remote_port, laddr, ssh_local_port(ssh), |
djm@openbsd.org@openbsd.org | b77c29a | 2017-10-27 00:18:41 +0000 | [diff] [blame] | 2115 | rdomain == NULL ? "" : " rdomain \"", |
| 2116 | rdomain == NULL ? "" : rdomain, |
| 2117 | rdomain == NULL ? "" : "\""); |
dtucker@openbsd.org | 15fdfc9 | 2015-04-15 23:23:25 +0000 | [diff] [blame] | 2118 | free(laddr); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2119 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2120 | /* |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 2121 | * We don't want to listen forever unless the other side |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2122 | * successfully authenticates itself. So we set up an alarm which is |
| 2123 | * cleared after successful authentication. A limit of zero |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 2124 | * 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] | 2125 | * mode; it is just annoying to have the server exit just when you |
| 2126 | * are about to discover the bug. |
| 2127 | */ |
dtucker@openbsd.org | 3bf2a6a | 2020-01-23 07:10:22 +0000 | [diff] [blame] | 2128 | ssh_signal(SIGALRM, grace_alarm_handler); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2129 | if (!debug_flag) |
| 2130 | alarm(options.login_grace_time); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2131 | |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 2132 | if (kex_exchange_identification(ssh, -1, options.version_addendum) != 0) |
| 2133 | cleanup_exit(255); /* error already logged */ |
| 2134 | |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 2135 | ssh_packet_set_nonblocking(ssh); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2136 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2137 | /* allocate authentication context */ |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 2138 | authctxt = xcalloc(1, sizeof(*authctxt)); |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 2139 | ssh->authctxt = authctxt; |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2140 | |
Damien Miller | 120a1ec | 2018-07-10 19:39:52 +1000 | [diff] [blame] | 2141 | authctxt->loginmsg = loginmsg; |
Darren Tucker | f3bb434 | 2005-03-31 21:39:25 +1000 | [diff] [blame] | 2142 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2143 | /* XXX global for cleanup, access from other modules */ |
| 2144 | the_authctxt = authctxt; |
| 2145 | |
djm@openbsd.org | 7c85685 | 2018-03-03 03:15:51 +0000 | [diff] [blame] | 2146 | /* Set default key authentication options */ |
| 2147 | if ((auth_opts = sshauthopt_new_with_keys_defaults()) == NULL) |
| 2148 | fatal("allocation failed"); |
| 2149 | |
Darren Tucker | 5c14c73 | 2005-01-24 21:55:49 +1100 | [diff] [blame] | 2150 | /* prepare buffer to collect messages to display to user after login */ |
markus@openbsd.org | 2808d18 | 2018-07-09 21:26:02 +0000 | [diff] [blame] | 2151 | if ((loginmsg = sshbuf_new()) == NULL) |
| 2152 | fatal("%s: sshbuf_new failed", __func__); |
Darren Tucker | cd70e1b | 2010-03-07 23:05:17 +1100 | [diff] [blame] | 2153 | auth_debug_reset(); |
Darren Tucker | 5c14c73 | 2005-01-24 21:55:49 +1100 | [diff] [blame] | 2154 | |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 2155 | if (use_privsep) { |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 2156 | if (privsep_preauth(ssh) == 1) |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 2157 | goto authenticated; |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 2158 | } else if (have_agent) { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 2159 | if ((r = ssh_get_authentication_socket(&auth_sock)) != 0) { |
| 2160 | error("Unable to get agent socket: %s", ssh_err(r)); |
djm@openbsd.org | 83f8ffa | 2015-01-17 18:53:34 +0000 | [diff] [blame] | 2161 | have_agent = 0; |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 2162 | } |
| 2163 | } |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2164 | |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 2165 | /* perform the key exchange */ |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 2166 | /* authenticate user and start session */ |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 2167 | do_ssh2_kex(ssh); |
Damien Miller | 5ebce13 | 2019-01-20 09:44:53 +1100 | [diff] [blame] | 2168 | do_authentication2(ssh); |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 2169 | |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 2170 | /* |
| 2171 | * If we use privilege separation, the unprivileged child transfers |
| 2172 | * the current keystate and exits |
| 2173 | */ |
| 2174 | if (use_privsep) { |
djm@openbsd.org | 04c091f | 2019-01-19 21:43:56 +0000 | [diff] [blame] | 2175 | mm_send_keystate(ssh, pmonitor); |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 2176 | ssh_packet_clear_keys(ssh); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2177 | exit(0); |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 2178 | } |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2179 | |
| 2180 | authenticated: |
Damien Miller | 7bff1a9 | 2005-12-24 14:59:12 +1100 | [diff] [blame] | 2181 | /* |
| 2182 | * Cancel the alarm we set to limit the time taken for |
| 2183 | * authentication. |
| 2184 | */ |
| 2185 | alarm(0); |
dtucker@openbsd.org | 3bf2a6a | 2020-01-23 07:10:22 +0000 | [diff] [blame] | 2186 | ssh_signal(SIGALRM, SIG_DFL); |
Damien Miller | 3f8123c | 2006-08-19 00:32:46 +1000 | [diff] [blame] | 2187 | authctxt->authenticated = 1; |
Damien Miller | 7bff1a9 | 2005-12-24 14:59:12 +1100 | [diff] [blame] | 2188 | if (startup_pipe != -1) { |
| 2189 | close(startup_pipe); |
| 2190 | startup_pipe = -1; |
| 2191 | } |
| 2192 | |
Darren Tucker | 2e0cf0d | 2005-02-08 21:52:47 +1100 | [diff] [blame] | 2193 | #ifdef SSH_AUDIT_EVENTS |
Damien Miller | 9b655dc | 2019-01-20 14:55:27 +1100 | [diff] [blame] | 2194 | audit_event(ssh, SSH_AUTH_SUCCESS); |
Darren Tucker | 269a1ea | 2005-02-03 00:20:53 +1100 | [diff] [blame] | 2195 | #endif |
| 2196 | |
Darren Tucker | 52358d6 | 2008-03-11 22:58:25 +1100 | [diff] [blame] | 2197 | #ifdef GSSAPI |
| 2198 | if (options.gss_authentication) { |
| 2199 | temporarily_use_uid(authctxt->pw); |
| 2200 | ssh_gssapi_storecreds(); |
| 2201 | restore_uid(); |
| 2202 | } |
| 2203 | #endif |
| 2204 | #ifdef USE_PAM |
| 2205 | if (options.use_pam) { |
| 2206 | do_pam_setcred(1); |
djm@openbsd.org | 7c85685 | 2018-03-03 03:15:51 +0000 | [diff] [blame] | 2207 | do_pam_session(ssh); |
Darren Tucker | 52358d6 | 2008-03-11 22:58:25 +1100 | [diff] [blame] | 2208 | } |
| 2209 | #endif |
| 2210 | |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 2211 | /* |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2212 | * In privilege separation, we fork another child and prepare |
| 2213 | * file descriptor passing. |
| 2214 | */ |
| 2215 | if (use_privsep) { |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 2216 | privsep_postauth(ssh, authctxt); |
Ben Lindstrom | 943481c | 2002-03-22 03:43:46 +0000 | [diff] [blame] | 2217 | /* the monitor process [priv] will not return */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2218 | } |
Ben Lindstrom | 73ab9ba | 2002-03-22 01:27:35 +0000 | [diff] [blame] | 2219 | |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 2220 | ssh_packet_set_timeout(ssh, options.client_alive_interval, |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 2221 | options.client_alive_count_max); |
| 2222 | |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 2223 | /* Try to send all our hostkeys to the client */ |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 2224 | notify_hostkeys(ssh); |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 2225 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2226 | /* Start session. */ |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 2227 | do_authenticated(ssh, authctxt); |
Ben Lindstrom | 73ab9ba | 2002-03-22 01:27:35 +0000 | [diff] [blame] | 2228 | |
Damien Miller | 3a5b023 | 2002-03-13 13:19:42 +1100 | [diff] [blame] | 2229 | /* The connection has been terminated. */ |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 2230 | ssh_packet_get_bytes(ssh, &ibytes, &obytes); |
Damien Miller | 821de0a | 2011-01-11 17:20:29 +1100 | [diff] [blame] | 2231 | verbose("Transferred: sent %llu, received %llu bytes", |
| 2232 | (unsigned long long)obytes, (unsigned long long)ibytes); |
Damien Miller | b61f3fc | 2008-07-11 17:36:48 +1000 | [diff] [blame] | 2233 | |
| 2234 | verbose("Closing connection to %.500s port %d", remote_ip, remote_port); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2235 | |
Damien Miller | beb4ba5 | 1999-12-28 15:09:35 +1100 | [diff] [blame] | 2236 | #ifdef USE_PAM |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 2237 | if (options.use_pam) |
| 2238 | finish_pam(); |
Damien Miller | beb4ba5 | 1999-12-28 15:09:35 +1100 | [diff] [blame] | 2239 | #endif /* USE_PAM */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2240 | |
Darren Tucker | 2b59a6d | 2005-03-06 22:38:51 +1100 | [diff] [blame] | 2241 | #ifdef SSH_AUDIT_EVENTS |
Damien Miller | 9b655dc | 2019-01-20 14:55:27 +1100 | [diff] [blame] | 2242 | PRIVSEP(audit_event(ssh, SSH_CONNECTION_CLOSE)); |
Darren Tucker | 2b59a6d | 2005-03-06 22:38:51 +1100 | [diff] [blame] | 2243 | #endif |
| 2244 | |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 2245 | ssh_packet_close(ssh); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2246 | |
| 2247 | if (use_privsep) |
| 2248 | mm_terminate(); |
| 2249 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2250 | exit(0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2251 | } |
| 2252 | |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 2253 | int |
djm@openbsd.org | 04c091f | 2019-01-19 21:43:56 +0000 | [diff] [blame] | 2254 | sshd_hostkey_sign(struct ssh *ssh, struct sshkey *privkey, |
| 2255 | struct sshkey *pubkey, u_char **signature, size_t *slenp, |
| 2256 | const u_char *data, size_t dlen, const char *alg) |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 2257 | { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 2258 | int r; |
| 2259 | |
djm@openbsd.org | 04c091f | 2019-01-19 21:43:56 +0000 | [diff] [blame] | 2260 | if (use_privsep) { |
| 2261 | if (privkey) { |
| 2262 | if (mm_sshkey_sign(ssh, privkey, signature, slenp, |
djm@openbsd.org | 56584cc | 2019-12-15 18:57:30 +0000 | [diff] [blame] | 2263 | data, dlen, alg, options.sk_provider, |
| 2264 | ssh->compat) < 0) |
djm@openbsd.org | 04c091f | 2019-01-19 21:43:56 +0000 | [diff] [blame] | 2265 | fatal("%s: privkey sign failed", __func__); |
| 2266 | } else { |
| 2267 | if (mm_sshkey_sign(ssh, pubkey, signature, slenp, |
djm@openbsd.org | 56584cc | 2019-12-15 18:57:30 +0000 | [diff] [blame] | 2268 | data, dlen, alg, options.sk_provider, |
| 2269 | ssh->compat) < 0) |
djm@openbsd.org | 04c091f | 2019-01-19 21:43:56 +0000 | [diff] [blame] | 2270 | fatal("%s: pubkey sign failed", __func__); |
| 2271 | } |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 2272 | } else { |
djm@openbsd.org | 04c091f | 2019-01-19 21:43:56 +0000 | [diff] [blame] | 2273 | if (privkey) { |
| 2274 | if (sshkey_sign(privkey, signature, slenp, data, dlen, |
djm@openbsd.org | 56584cc | 2019-12-15 18:57:30 +0000 | [diff] [blame] | 2275 | alg, options.sk_provider, ssh->compat) < 0) |
djm@openbsd.org | 04c091f | 2019-01-19 21:43:56 +0000 | [diff] [blame] | 2276 | fatal("%s: privkey sign failed", __func__); |
| 2277 | } else { |
| 2278 | if ((r = ssh_agent_sign(auth_sock, pubkey, |
| 2279 | signature, slenp, data, dlen, alg, |
| 2280 | ssh->compat)) != 0) { |
| 2281 | fatal("%s: agent sign failed: %s", |
| 2282 | __func__, ssh_err(r)); |
| 2283 | } |
| 2284 | } |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 2285 | } |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 2286 | return 0; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 2287 | } |
| 2288 | |
djm@openbsd.org | bdfd29f | 2015-07-03 03:47:00 +0000 | [diff] [blame] | 2289 | /* SSH2 key exchange */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2290 | static void |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 2291 | do_ssh2_kex(struct ssh *ssh) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2292 | { |
Damien Miller | 9235a03 | 2014-04-20 13:17:20 +1000 | [diff] [blame] | 2293 | char *myproposal[PROPOSAL_MAX] = { KEX_SERVER }; |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 2294 | struct kex *kex; |
markus@openbsd.org | 57e783c | 2015-01-20 20:16:21 +0000 | [diff] [blame] | 2295 | int r; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2296 | |
djm@openbsd.org | f9eca24 | 2015-07-30 00:01:34 +0000 | [diff] [blame] | 2297 | myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal( |
djm@openbsd.org | c3903c3 | 2018-08-13 02:41:05 +0000 | [diff] [blame] | 2298 | options.kex_algorithms); |
djm@openbsd.org | f9eca24 | 2015-07-30 00:01:34 +0000 | [diff] [blame] | 2299 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = compat_cipher_proposal( |
djm@openbsd.org | c3903c3 | 2018-08-13 02:41:05 +0000 | [diff] [blame] | 2300 | options.ciphers); |
djm@openbsd.org | f9eca24 | 2015-07-30 00:01:34 +0000 | [diff] [blame] | 2301 | myproposal[PROPOSAL_ENC_ALGS_STOC] = compat_cipher_proposal( |
djm@openbsd.org | c3903c3 | 2018-08-13 02:41:05 +0000 | [diff] [blame] | 2302 | options.ciphers); |
djm@openbsd.org | f9eca24 | 2015-07-30 00:01:34 +0000 | [diff] [blame] | 2303 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = |
| 2304 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; |
Damien Miller | a0ff466 | 2001-03-30 10:49:35 +1000 | [diff] [blame] | 2305 | |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 2306 | if (options.compression == COMP_NONE) { |
Ben Lindstrom | 23e0f66 | 2002-06-21 01:09:47 +0000 | [diff] [blame] | 2307 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
dtucker@openbsd.org | 8c02e36 | 2016-05-24 04:43:45 +0000 | [diff] [blame] | 2308 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none"; |
Ben Lindstrom | 23e0f66 | 2002-06-21 01:09:47 +0000 | [diff] [blame] | 2309 | } |
Damien Miller | 9395b28 | 2014-04-20 13:25:30 +1000 | [diff] [blame] | 2310 | |
Darren Tucker | 5f96f3b | 2013-05-16 20:29:28 +1000 | [diff] [blame] | 2311 | if (options.rekey_limit || options.rekey_interval) |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 2312 | ssh_packet_set_rekey_limits(ssh, options.rekey_limit, |
dtucker@openbsd.org | c998bf0 | 2017-02-03 02:56:00 +0000 | [diff] [blame] | 2313 | options.rekey_interval); |
Darren Tucker | 5f96f3b | 2013-05-16 20:29:28 +1000 | [diff] [blame] | 2314 | |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 2315 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = compat_pkalg_proposal( |
djm@openbsd.org | c3903c3 | 2018-08-13 02:41:05 +0000 | [diff] [blame] | 2316 | list_hostkey_types()); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2317 | |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 2318 | /* start key exchange */ |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 2319 | if ((r = kex_setup(ssh, myproposal)) != 0) |
markus@openbsd.org | 57e783c | 2015-01-20 20:16:21 +0000 | [diff] [blame] | 2320 | fatal("kex_setup: %s", ssh_err(r)); |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 2321 | kex = ssh->kex; |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 2322 | #ifdef WITH_OPENSSL |
djm@openbsd.org | aaca72d | 2019-01-21 10:40:11 +0000 | [diff] [blame] | 2323 | kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_server; |
| 2324 | kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_server; |
| 2325 | kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_server; |
| 2326 | kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_server; |
| 2327 | kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_server; |
Damien Miller | 8e7fb33 | 2003-02-24 12:03:03 +1100 | [diff] [blame] | 2328 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
Damien Miller | a63128d | 2006-03-15 12:08:28 +1100 | [diff] [blame] | 2329 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; |
Darren Tucker | f2004cd | 2015-02-23 05:04:21 +1100 | [diff] [blame] | 2330 | # ifdef OPENSSL_HAS_ECC |
djm@openbsd.org | aaca72d | 2019-01-21 10:40:11 +0000 | [diff] [blame] | 2331 | kex->kex[KEX_ECDH_SHA2] = kex_gen_server; |
Darren Tucker | f2004cd | 2015-02-23 05:04:21 +1100 | [diff] [blame] | 2332 | # endif |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 2333 | #endif |
djm@openbsd.org | aaca72d | 2019-01-21 10:40:11 +0000 | [diff] [blame] | 2334 | kex->kex[KEX_C25519_SHA256] = kex_gen_server; |
| 2335 | kex->kex[KEX_KEM_SNTRUP4591761X25519_SHA512] = kex_gen_server; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 2336 | kex->load_host_public_key=&get_hostkey_public_by_type; |
| 2337 | kex->load_host_private_key=&get_hostkey_private_by_type; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2338 | kex->host_key_index=&get_hostkey_index; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 2339 | kex->sign = sshd_hostkey_sign; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2340 | |
djm@openbsd.org | 6350e03 | 2019-01-19 21:42:30 +0000 | [diff] [blame] | 2341 | ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &kex->done); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 2342 | |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 2343 | session_id2 = kex->session_id; |
| 2344 | session_id2_len = kex->session_id_len; |
| 2345 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 2346 | #ifdef DEBUG_KEXDH |
| 2347 | /* send 1st encrypted/maced/compressed message */ |
| 2348 | packet_start(SSH2_MSG_IGNORE); |
| 2349 | packet_put_cstring("markus"); |
| 2350 | packet_send(); |
| 2351 | packet_write_wait(); |
| 2352 | #endif |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 2353 | debug("KEX done"); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2354 | } |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2355 | |
| 2356 | /* server specific fatal cleanup */ |
| 2357 | void |
| 2358 | cleanup_exit(int i) |
| 2359 | { |
djm@openbsd.org | 04c091f | 2019-01-19 21:43:56 +0000 | [diff] [blame] | 2360 | if (the_active_state != NULL && the_authctxt != NULL) { |
| 2361 | do_cleanup(the_active_state, the_authctxt); |
Damien Miller | 75c6272 | 2014-04-20 13:24:31 +1000 | [diff] [blame] | 2362 | if (use_privsep && privsep_is_preauth && |
| 2363 | pmonitor != NULL && pmonitor->m_pid > 1) { |
Damien Miller | 9ee2c60 | 2011-09-22 21:38:30 +1000 | [diff] [blame] | 2364 | debug("Killing privsep child %d", pmonitor->m_pid); |
| 2365 | if (kill(pmonitor->m_pid, SIGKILL) != 0 && |
Darren Tucker | 2e13560 | 2011-10-02 19:10:13 +1100 | [diff] [blame] | 2366 | errno != ESRCH) |
Damien Miller | 9ee2c60 | 2011-09-22 21:38:30 +1000 | [diff] [blame] | 2367 | error("%s: kill(%d): %s", __func__, |
| 2368 | pmonitor->m_pid, strerror(errno)); |
| 2369 | } |
| 2370 | } |
Darren Tucker | 2e0cf0d | 2005-02-08 21:52:47 +1100 | [diff] [blame] | 2371 | #ifdef SSH_AUDIT_EVENTS |
Darren Tucker | 269a1ea | 2005-02-03 00:20:53 +1100 | [diff] [blame] | 2372 | /* done after do_cleanup so it can cancel the PAM auth 'thread' */ |
Damien Miller | 9b655dc | 2019-01-20 14:55:27 +1100 | [diff] [blame] | 2373 | if (the_active_state != NULL && (!use_privsep || mm_is_monitor())) |
| 2374 | audit_event(the_active_state, SSH_CONNECTION_ABANDON); |
Darren Tucker | 269a1ea | 2005-02-03 00:20:53 +1100 | [diff] [blame] | 2375 | #endif |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2376 | _exit(i); |
| 2377 | } |