djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1 | /* $OpenBSD: serverloop.c,v 1.184 2016/03/07 19:02:43 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 | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 6 | * Server main loop for handling the interactive session. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 7 | * |
| 8 | * As far as I am concerned, the code I have written for this software |
| 9 | * can be used freely for any purpose. Any derived versions of this |
| 10 | * software must be clearly marked as such, and if the derived work is |
| 11 | * incompatible with the protocol description in the RFC file, it must be |
| 12 | * called by a name other than "ssh" or "Secure Shell". |
| 13 | * |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 14 | * SSH2 support by Markus Friedl. |
Ben Lindstrom | 4469723 | 2001-07-04 03:32:30 +0000 | [diff] [blame] | 15 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 16 | * |
| 17 | * Redistribution and use in source and binary forms, with or without |
| 18 | * modification, are permitted provided that the following conditions |
| 19 | * are met: |
| 20 | * 1. Redistributions of source code must retain the above copyright |
| 21 | * notice, this list of conditions and the following disclaimer. |
| 22 | * 2. Redistributions in binary form must reproduce the above copyright |
| 23 | * notice, this list of conditions and the following disclaimer in the |
| 24 | * documentation and/or other materials provided with the distribution. |
| 25 | * |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 27 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 28 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 29 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 30 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 31 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 32 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 33 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 34 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 35 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 36 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 37 | |
| 38 | #include "includes.h" |
Damien Miller | 9cf6d07 | 2006-03-15 11:29:24 +1100 | [diff] [blame] | 39 | |
deraadt@openbsd.org | 087266e | 2015-01-20 23:14:00 +0000 | [diff] [blame] | 40 | #include <sys/param.h> /* MIN MAX */ |
Damien Miller | 9cf6d07 | 2006-03-15 11:29:24 +1100 | [diff] [blame] | 41 | #include <sys/types.h> |
| 42 | #include <sys/wait.h> |
Damien Miller | 8ec8c3e | 2006-07-10 20:35:38 +1000 | [diff] [blame] | 43 | #include <sys/socket.h> |
Damien Miller | 9aec919 | 2006-08-05 10:57:45 +1000 | [diff] [blame] | 44 | #ifdef HAVE_SYS_TIME_H |
| 45 | # include <sys/time.h> |
| 46 | #endif |
Damien Miller | 8ec8c3e | 2006-07-10 20:35:38 +1000 | [diff] [blame] | 47 | |
| 48 | #include <netinet/in.h> |
Damien Miller | 99bd21e | 2006-03-15 11:11:28 +1100 | [diff] [blame] | 49 | |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 50 | #include <errno.h> |
Damien Miller | 57cf638 | 2006-07-10 21:13:46 +1000 | [diff] [blame] | 51 | #include <fcntl.h> |
Damien Miller | 9f2abc4 | 2006-07-10 20:53:08 +1000 | [diff] [blame] | 52 | #include <pwd.h> |
Damien Miller | 6ff3cad | 2006-03-15 11:52:09 +1100 | [diff] [blame] | 53 | #include <signal.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 54 | #include <string.h> |
Damien Miller | 99bd21e | 2006-03-15 11:11:28 +1100 | [diff] [blame] | 55 | #include <termios.h> |
Damien Miller | 1cdde6f | 2006-07-24 14:07:35 +1000 | [diff] [blame] | 56 | #include <unistd.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 57 | #include <stdarg.h> |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 58 | |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 59 | #include "openbsd-compat/sys-queue.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 60 | #include "xmalloc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 61 | #include "packet.h" |
| 62 | #include "buffer.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 63 | #include "log.h" |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 64 | #include "misc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 65 | #include "servconf.h" |
Damien Miller | 16aed05 | 2002-09-22 01:26:27 +1000 | [diff] [blame] | 66 | #include "canohost.h" |
Ben Lindstrom | d95c09c | 2001-02-18 19:13:33 +0000 | [diff] [blame] | 67 | #include "sshpty.h" |
Ben Lindstrom | c763767 | 2001-06-09 00:36:26 +0000 | [diff] [blame] | 68 | #include "channels.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 69 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 70 | #include "ssh1.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 71 | #include "ssh2.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 72 | #include "key.h" |
| 73 | #include "cipher.h" |
| 74 | #include "kex.h" |
| 75 | #include "hostfile.h" |
Ben Lindstrom | db65e8f | 2001-01-19 04:26:52 +0000 | [diff] [blame] | 76 | #include "auth.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 77 | #include "session.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 78 | #include "dispatch.h" |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 79 | #include "auth-options.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 80 | #include "serverloop.h" |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 81 | #include "ssherr.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 82 | |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 83 | extern ServerOptions options; |
| 84 | |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 85 | /* XXX */ |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 86 | extern Authctxt *the_authctxt; |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 87 | extern int use_privsep; |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 88 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 89 | static Buffer stdin_buffer; /* Buffer for stdin data. */ |
| 90 | static Buffer stdout_buffer; /* Buffer for stdout data. */ |
| 91 | static Buffer stderr_buffer; /* Buffer for stderr data. */ |
| 92 | static int fdin; /* Descriptor for stdin (for writing) */ |
| 93 | static int fdout; /* Descriptor for stdout (for reading); |
| 94 | May be same number as fdin. */ |
| 95 | static int fderr; /* Descriptor for stderr. May be -1. */ |
| 96 | static long stdin_bytes = 0; /* Number of bytes written to stdin. */ |
| 97 | static long stdout_bytes = 0; /* Number of stdout bytes sent to client. */ |
| 98 | static long stderr_bytes = 0; /* Number of stderr bytes sent to client. */ |
| 99 | static long fdout_bytes = 0; /* Number of stdout bytes read from program. */ |
| 100 | static int stdin_eof = 0; /* EOF message received from client. */ |
| 101 | static int fdout_eof = 0; /* EOF encountered reading from fdout. */ |
| 102 | static int fderr_eof = 0; /* EOF encountered readung from fderr. */ |
Damien Miller | 225736c | 2001-02-19 21:51:08 +1100 | [diff] [blame] | 103 | static int fdin_is_tty = 0; /* fdin points to a tty. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 104 | static int connection_in; /* Connection to client (input). */ |
| 105 | static int connection_out; /* Connection to client (output). */ |
Ben Lindstrom | e34ab4c | 2001-04-07 01:12:11 +0000 | [diff] [blame] | 106 | static int connection_closed = 0; /* Connection to client closed. */ |
| 107 | static u_int buffer_high; /* "Soft" max buffer size. */ |
Darren Tucker | 8901fa9 | 2008-06-11 09:34:01 +1000 | [diff] [blame] | 108 | static int no_more_sessions = 0; /* Disallow further sessions. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 109 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 110 | /* |
| 111 | * This SIGCHLD kludge is used to detect when the child exits. The server |
| 112 | * will exit after that, as soon as forwarded connections have terminated. |
| 113 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 114 | |
Ben Lindstrom | 5e71c54 | 2001-12-06 16:48:14 +0000 | [diff] [blame] | 115 | static volatile sig_atomic_t child_terminated = 0; /* The child has terminated. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 116 | |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 117 | /* Cleanup on signals (!use_privsep case only) */ |
| 118 | static volatile sig_atomic_t received_sigterm = 0; |
| 119 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 120 | /* prototypes */ |
| 121 | static void server_init_dispatch(void); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 122 | |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 123 | /* |
| 124 | * we write to this pipe if a SIGCHLD is caught in order to avoid |
| 125 | * the race between select() and child_terminated |
| 126 | */ |
| 127 | static int notify_pipe[2]; |
| 128 | static void |
| 129 | notify_setup(void) |
| 130 | { |
| 131 | if (pipe(notify_pipe) < 0) { |
| 132 | error("pipe(notify_pipe) failed %s", strerror(errno)); |
Damien Miller | 814ace0 | 2011-05-20 19:02:47 +1000 | [diff] [blame] | 133 | } else if ((fcntl(notify_pipe[0], F_SETFD, FD_CLOEXEC) == -1) || |
| 134 | (fcntl(notify_pipe[1], F_SETFD, FD_CLOEXEC) == -1)) { |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 135 | error("fcntl(notify_pipe, F_SETFD) failed %s", strerror(errno)); |
| 136 | close(notify_pipe[0]); |
| 137 | close(notify_pipe[1]); |
| 138 | } else { |
| 139 | set_nonblock(notify_pipe[0]); |
| 140 | set_nonblock(notify_pipe[1]); |
| 141 | return; |
| 142 | } |
| 143 | notify_pipe[0] = -1; /* read end */ |
| 144 | notify_pipe[1] = -1; /* write end */ |
| 145 | } |
| 146 | static void |
| 147 | notify_parent(void) |
| 148 | { |
| 149 | if (notify_pipe[1] != -1) |
Darren Tucker | dbee308 | 2013-05-16 20:32:29 +1000 | [diff] [blame] | 150 | (void)write(notify_pipe[1], "", 1); |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 151 | } |
| 152 | static void |
| 153 | notify_prepare(fd_set *readset) |
| 154 | { |
| 155 | if (notify_pipe[0] != -1) |
| 156 | FD_SET(notify_pipe[0], readset); |
| 157 | } |
| 158 | static void |
| 159 | notify_done(fd_set *readset) |
| 160 | { |
| 161 | char c; |
| 162 | |
| 163 | if (notify_pipe[0] != -1 && FD_ISSET(notify_pipe[0], readset)) |
| 164 | while (read(notify_pipe[0], &c, 1) != -1) |
| 165 | debug2("notify_done: reading"); |
| 166 | } |
| 167 | |
Damien Miller | f0b15df | 2006-03-26 13:59:20 +1100 | [diff] [blame] | 168 | /*ARGSUSED*/ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 169 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 170 | sigchld_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 171 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 172 | int save_errno = errno; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 173 | child_terminated = 1; |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 174 | #ifndef _UNICOS |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 175 | mysignal(SIGCHLD, sigchld_handler); |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 176 | #endif |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 177 | notify_parent(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 178 | errno = save_errno; |
| 179 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 180 | |
Damien Miller | f0b15df | 2006-03-26 13:59:20 +1100 | [diff] [blame] | 181 | /*ARGSUSED*/ |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 182 | static void |
| 183 | sigterm_handler(int sig) |
| 184 | { |
| 185 | received_sigterm = sig; |
| 186 | } |
| 187 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 188 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 189 | * Make packets from buffered stderr data, and buffer it for sending |
| 190 | * to the client. |
| 191 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 192 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 193 | make_packets_from_stderr_data(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 194 | { |
Darren Tucker | 502d384 | 2003-06-28 12:38:01 +1000 | [diff] [blame] | 195 | u_int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 196 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 197 | /* Send buffered stderr data to the client. */ |
| 198 | while (buffer_len(&stderr_buffer) > 0 && |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 199 | packet_not_very_much_data_to_write()) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 200 | len = buffer_len(&stderr_buffer); |
| 201 | if (packet_is_interactive()) { |
| 202 | if (len > 512) |
| 203 | len = 512; |
| 204 | } else { |
| 205 | /* Keep the packets at reasonable size. */ |
| 206 | if (len > packet_get_maxsize()) |
| 207 | len = packet_get_maxsize(); |
| 208 | } |
| 209 | packet_start(SSH_SMSG_STDERR_DATA); |
| 210 | packet_put_string(buffer_ptr(&stderr_buffer), len); |
| 211 | packet_send(); |
| 212 | buffer_consume(&stderr_buffer, len); |
| 213 | stderr_bytes += len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 214 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 215 | } |
| 216 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 217 | /* |
| 218 | * Make packets from buffered stdout data, and buffer it for sending to the |
| 219 | * client. |
| 220 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 221 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 222 | make_packets_from_stdout_data(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 223 | { |
Darren Tucker | 502d384 | 2003-06-28 12:38:01 +1000 | [diff] [blame] | 224 | u_int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 225 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 226 | /* Send buffered stdout data to the client. */ |
| 227 | while (buffer_len(&stdout_buffer) > 0 && |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 228 | packet_not_very_much_data_to_write()) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 229 | len = buffer_len(&stdout_buffer); |
| 230 | if (packet_is_interactive()) { |
| 231 | if (len > 512) |
| 232 | len = 512; |
| 233 | } else { |
| 234 | /* Keep the packets at reasonable size. */ |
| 235 | if (len > packet_get_maxsize()) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 236 | len = packet_get_maxsize(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 237 | } |
| 238 | packet_start(SSH_SMSG_STDOUT_DATA); |
| 239 | packet_put_string(buffer_ptr(&stdout_buffer), len); |
| 240 | packet_send(); |
| 241 | buffer_consume(&stdout_buffer, len); |
| 242 | stdout_bytes += len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 243 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 244 | } |
| 245 | |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 246 | static void |
| 247 | client_alive_check(void) |
| 248 | { |
Damien Miller | b5820f4 | 2003-12-17 16:27:32 +1100 | [diff] [blame] | 249 | int channel_id; |
Damien Miller | 056cf73 | 2002-01-22 23:21:39 +1100 | [diff] [blame] | 250 | |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 251 | /* timeout, check to see how many we have had */ |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 252 | if (packet_inc_alive_timeouts() > options.client_alive_count_max) { |
Damien Miller | 985a448 | 2006-10-24 03:02:41 +1000 | [diff] [blame] | 253 | logit("Timeout, client not responding."); |
| 254 | cleanup_exit(255); |
| 255 | } |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 256 | |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 257 | /* |
Damien Miller | b5820f4 | 2003-12-17 16:27:32 +1100 | [diff] [blame] | 258 | * send a bogus global/channel request with "wantreply", |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 259 | * we should get back a failure |
| 260 | */ |
Damien Miller | b5820f4 | 2003-12-17 16:27:32 +1100 | [diff] [blame] | 261 | if ((channel_id = channel_find_open()) == -1) { |
| 262 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 263 | packet_put_cstring("keepalive@openssh.com"); |
| 264 | packet_put_char(1); /* boolean: want reply */ |
| 265 | } else { |
| 266 | channel_request_start(channel_id, "keepalive@openssh.com", 1); |
| 267 | } |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 268 | packet_send(); |
| 269 | } |
| 270 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 271 | /* |
| 272 | * Sleep in select() until we can do something. This will initialize the |
| 273 | * select masks. Upon return, the masks will indicate which descriptors |
| 274 | * have data or can accept data. Optionally, a maximum time can be specified |
| 275 | * for the duration of the wait (0 = infinite). |
| 276 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 277 | static void |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 278 | wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
djm@openbsd.org | 988e429 | 2016-03-04 03:35:44 +0000 | [diff] [blame] | 279 | u_int *nallocp, u_int64_t max_time_ms) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 280 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 281 | struct timeval tv, *tvp; |
| 282 | int ret; |
Damien Miller | 6c6da33 | 2012-06-20 22:31:26 +1000 | [diff] [blame] | 283 | time_t minwait_secs = 0; |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 284 | int client_alive_scheduled = 0; |
Damien Miller | e42bd24 | 2007-01-29 10:16:28 +1100 | [diff] [blame] | 285 | int program_alive_scheduled = 0; |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 286 | |
Damien Miller | a650875 | 2012-04-22 11:21:10 +1000 | [diff] [blame] | 287 | /* Allocate and update select() masks for channel descriptors. */ |
| 288 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, |
| 289 | &minwait_secs, 0); |
| 290 | |
djm@openbsd.org | 988e429 | 2016-03-04 03:35:44 +0000 | [diff] [blame] | 291 | /* XXX need proper deadline system for rekey/client alive */ |
Damien Miller | a650875 | 2012-04-22 11:21:10 +1000 | [diff] [blame] | 292 | if (minwait_secs != 0) |
djm@openbsd.org | 988e429 | 2016-03-04 03:35:44 +0000 | [diff] [blame] | 293 | max_time_ms = MIN(max_time_ms, (u_int)minwait_secs * 1000); |
Damien Miller | a650875 | 2012-04-22 11:21:10 +1000 | [diff] [blame] | 294 | |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 295 | /* |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 296 | * if using client_alive, set the max timeout accordingly, |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 297 | * and indicate that this particular timeout was for client |
| 298 | * alive by setting the client_alive_scheduled flag. |
| 299 | * |
| 300 | * this could be randomized somewhat to make traffic |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 301 | * analysis more difficult, but we're not doing it yet. |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 302 | */ |
djm@openbsd.org | 988e429 | 2016-03-04 03:35:44 +0000 | [diff] [blame] | 303 | if (compat20 && options.client_alive_interval) { |
| 304 | uint64_t keepalive_ms = |
| 305 | (uint64_t)options.client_alive_interval * 1000; |
| 306 | |
Ben Lindstrom | 2f0304c | 2001-04-29 19:49:14 +0000 | [diff] [blame] | 307 | client_alive_scheduled = 1; |
djm@openbsd.org | 988e429 | 2016-03-04 03:35:44 +0000 | [diff] [blame] | 308 | if (max_time_ms == 0 || max_time_ms > keepalive_ms) |
| 309 | max_time_ms = keepalive_ms; |
Ben Lindstrom | 36857f6 | 2001-07-18 15:48:57 +0000 | [diff] [blame] | 310 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 311 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 312 | if (compat20) { |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 313 | #if 0 |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 314 | /* wrong: bad condition XXX */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 315 | if (channel_not_very_much_buffered_data()) |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 316 | #endif |
| 317 | FD_SET(connection_in, *readsetp); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 318 | } else { |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 319 | /* |
| 320 | * Read packets from the client unless we have too much |
| 321 | * buffered stdin or channel data. |
| 322 | */ |
| 323 | if (buffer_len(&stdin_buffer) < buffer_high && |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 324 | channel_not_very_much_buffered_data()) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 325 | FD_SET(connection_in, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 326 | /* |
| 327 | * If there is not too much data already buffered going to |
| 328 | * the client, try to get some more data from the program. |
| 329 | */ |
| 330 | if (packet_not_very_much_data_to_write()) { |
Damien Miller | e42bd24 | 2007-01-29 10:16:28 +1100 | [diff] [blame] | 331 | program_alive_scheduled = child_terminated; |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 332 | if (!fdout_eof) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 333 | FD_SET(fdout, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 334 | if (!fderr_eof) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 335 | FD_SET(fderr, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 336 | } |
| 337 | /* |
| 338 | * If we have buffered data, try to write some of that data |
| 339 | * to the program. |
| 340 | */ |
| 341 | if (fdin != -1 && buffer_len(&stdin_buffer) > 0) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 342 | FD_SET(fdin, *writesetp); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 343 | } |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 344 | notify_prepare(*readsetp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 345 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 346 | /* |
| 347 | * If we have buffered packet data going to the client, mark that |
| 348 | * descriptor. |
| 349 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 350 | if (packet_have_data_to_write()) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 351 | FD_SET(connection_out, *writesetp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 352 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 353 | /* |
| 354 | * If child has terminated and there is enough buffer space to read |
| 355 | * from it, then read as much as is available and exit. |
| 356 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 357 | if (child_terminated && packet_not_very_much_data_to_write()) |
djm@openbsd.org | 988e429 | 2016-03-04 03:35:44 +0000 | [diff] [blame] | 358 | if (max_time_ms == 0 || client_alive_scheduled) |
| 359 | max_time_ms = 100; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 360 | |
djm@openbsd.org | 988e429 | 2016-03-04 03:35:44 +0000 | [diff] [blame] | 361 | if (max_time_ms == 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 362 | tvp = NULL; |
| 363 | else { |
djm@openbsd.org | 988e429 | 2016-03-04 03:35:44 +0000 | [diff] [blame] | 364 | tv.tv_sec = max_time_ms / 1000; |
| 365 | tv.tv_usec = 1000 * (max_time_ms % 1000); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 366 | tvp = &tv; |
| 367 | } |
| 368 | |
| 369 | /* Wait for something to happen, or the timeout to expire. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 370 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 371 | |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 372 | if (ret == -1) { |
Damien Miller | 79faeff | 2001-11-12 11:06:32 +1100 | [diff] [blame] | 373 | memset(*readsetp, 0, *nallocp); |
| 374 | memset(*writesetp, 0, *nallocp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 375 | if (errno != EINTR) |
| 376 | error("select: %.100s", strerror(errno)); |
Damien Miller | e42bd24 | 2007-01-29 10:16:28 +1100 | [diff] [blame] | 377 | } else { |
| 378 | if (ret == 0 && client_alive_scheduled) |
| 379 | client_alive_check(); |
| 380 | if (!compat20 && program_alive_scheduled && fdin_is_tty) { |
| 381 | if (!fdout_eof) |
| 382 | FD_SET(fdout, *readsetp); |
| 383 | if (!fderr_eof) |
| 384 | FD_SET(fderr, *readsetp); |
| 385 | } |
| 386 | } |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 387 | |
| 388 | notify_done(*readsetp); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 389 | } |
| 390 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 391 | /* |
| 392 | * Processes input from the client and the program. Input data is stored |
| 393 | * in buffers and processed later. |
| 394 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 395 | static void |
Damien Miller | 90fdfaf | 2006-03-26 14:25:37 +1100 | [diff] [blame] | 396 | process_input(fd_set *readset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 397 | { |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 398 | struct ssh *ssh = active_state; /* XXX */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 399 | int len; |
| 400 | char buf[16384]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 401 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 402 | /* Read and buffer any input data from the client. */ |
| 403 | if (FD_ISSET(connection_in, readset)) { |
markus@openbsd.org | a306863 | 2016-01-14 16:17:39 +0000 | [diff] [blame] | 404 | len = read(connection_in, buf, sizeof(buf)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 405 | if (len == 0) { |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 406 | verbose("Connection closed by %.100s port %d", |
| 407 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh)); |
Ben Lindstrom | e34ab4c | 2001-04-07 01:12:11 +0000 | [diff] [blame] | 408 | connection_closed = 1; |
| 409 | if (compat20) |
| 410 | return; |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 411 | cleanup_exit(255); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 412 | } else if (len < 0) { |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 413 | if (errno != EINTR && errno != EAGAIN && |
| 414 | errno != EWOULDBLOCK) { |
Damien Miller | 16aed05 | 2002-09-22 01:26:27 +1000 | [diff] [blame] | 415 | verbose("Read error from remote host " |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 416 | "%.100s port %d: %.100s", |
| 417 | ssh_remote_ipaddr(ssh), |
| 418 | ssh_remote_port(ssh), strerror(errno)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 419 | cleanup_exit(255); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 420 | } |
| 421 | } else { |
| 422 | /* Buffer any received data. */ |
| 423 | packet_process_incoming(buf, len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 424 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 425 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 426 | if (compat20) |
| 427 | return; |
| 428 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 429 | /* Read and buffer any available stdout data from the program. */ |
| 430 | if (!fdout_eof && FD_ISSET(fdout, readset)) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 431 | errno = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 432 | len = read(fdout, buf, sizeof(buf)); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 433 | if (len < 0 && (errno == EINTR || ((errno == EAGAIN || |
| 434 | errno == EWOULDBLOCK) && !child_terminated))) { |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 435 | /* do nothing */ |
Darren Tucker | 03890e4 | 2006-06-24 16:58:45 +1000 | [diff] [blame] | 436 | #ifndef PTY_ZEROREAD |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 437 | } else if (len <= 0) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 438 | #else |
Darren Tucker | 144e8d6 | 2006-06-25 08:25:25 +1000 | [diff] [blame] | 439 | } else if ((!isatty(fdout) && len <= 0) || |
| 440 | (isatty(fdout) && (len < 0 || (len == 0 && errno != 0)))) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 441 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 442 | fdout_eof = 1; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 443 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 444 | buffer_append(&stdout_buffer, buf, len); |
| 445 | fdout_bytes += len; |
| 446 | } |
| 447 | } |
| 448 | /* Read and buffer any available stderr data from the program. */ |
| 449 | if (!fderr_eof && FD_ISSET(fderr, readset)) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 450 | errno = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 451 | len = read(fderr, buf, sizeof(buf)); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 452 | if (len < 0 && (errno == EINTR || ((errno == EAGAIN || |
| 453 | errno == EWOULDBLOCK) && !child_terminated))) { |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 454 | /* do nothing */ |
Darren Tucker | 03890e4 | 2006-06-24 16:58:45 +1000 | [diff] [blame] | 455 | #ifndef PTY_ZEROREAD |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 456 | } else if (len <= 0) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 457 | #else |
Darren Tucker | 144e8d6 | 2006-06-25 08:25:25 +1000 | [diff] [blame] | 458 | } else if ((!isatty(fderr) && len <= 0) || |
| 459 | (isatty(fderr) && (len < 0 || (len == 0 && errno != 0)))) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 460 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 461 | fderr_eof = 1; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 462 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 463 | buffer_append(&stderr_buffer, buf, len); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 464 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 465 | } |
| 466 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 467 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 468 | /* |
| 469 | * Sends data from internal buffers to client program stdin. |
| 470 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 471 | static void |
Damien Miller | 90fdfaf | 2006-03-26 14:25:37 +1100 | [diff] [blame] | 472 | process_output(fd_set *writeset) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 473 | { |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 474 | struct termios tio; |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 475 | u_char *data; |
| 476 | u_int dlen; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 477 | int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 478 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 479 | /* Write buffered data to program stdin. */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 480 | if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) { |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 481 | data = buffer_ptr(&stdin_buffer); |
| 482 | dlen = buffer_len(&stdin_buffer); |
| 483 | len = write(fdin, data, dlen); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 484 | if (len < 0 && |
| 485 | (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) { |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 486 | /* do nothing */ |
| 487 | } else if (len <= 0) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 488 | if (fdin != fdout) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 489 | close(fdin); |
| 490 | else |
| 491 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 492 | fdin = -1; |
| 493 | } else { |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 494 | /* Successful write. */ |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 495 | if (fdin_is_tty && dlen >= 1 && data[0] != '\r' && |
| 496 | tcgetattr(fdin, &tio) == 0 && |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 497 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { |
Kevin Steves | b7f036f | 2001-02-15 17:27:15 +0000 | [diff] [blame] | 498 | /* |
| 499 | * Simulate echo to reduce the impact of |
| 500 | * traffic analysis |
| 501 | */ |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 502 | packet_send_ignore(len); |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 503 | packet_send(); |
| 504 | } |
| 505 | /* Consume the data from the buffer. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 506 | buffer_consume(&stdin_buffer, len); |
| 507 | /* Update the count of bytes written to the program. */ |
| 508 | stdin_bytes += len; |
| 509 | } |
| 510 | } |
| 511 | /* Send any buffered packet data to the client. */ |
| 512 | if (FD_ISSET(connection_out, writeset)) |
| 513 | packet_write_poll(); |
| 514 | } |
| 515 | |
| 516 | /* |
| 517 | * Wait until all buffered output has been sent to the client. |
| 518 | * This is used when the program terminates. |
| 519 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 520 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 521 | drain_output(void) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 522 | { |
| 523 | /* Send any buffered stdout data to the client. */ |
| 524 | if (buffer_len(&stdout_buffer) > 0) { |
| 525 | packet_start(SSH_SMSG_STDOUT_DATA); |
| 526 | packet_put_string(buffer_ptr(&stdout_buffer), |
| 527 | buffer_len(&stdout_buffer)); |
| 528 | packet_send(); |
| 529 | /* Update the count of sent bytes. */ |
| 530 | stdout_bytes += buffer_len(&stdout_buffer); |
| 531 | } |
| 532 | /* Send any buffered stderr data to the client. */ |
| 533 | if (buffer_len(&stderr_buffer) > 0) { |
| 534 | packet_start(SSH_SMSG_STDERR_DATA); |
| 535 | packet_put_string(buffer_ptr(&stderr_buffer), |
| 536 | buffer_len(&stderr_buffer)); |
| 537 | packet_send(); |
| 538 | /* Update the count of sent bytes. */ |
| 539 | stderr_bytes += buffer_len(&stderr_buffer); |
| 540 | } |
| 541 | /* Wait until all buffered data has been written to the client. */ |
| 542 | packet_write_wait(); |
| 543 | } |
| 544 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 545 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 546 | process_buffered_input_packets(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 547 | { |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 548 | dispatch_run(DISPATCH_NONBLOCK, NULL, active_state); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 549 | } |
| 550 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 551 | /* |
| 552 | * Performs the interactive session. This handles data transmission between |
| 553 | * the client and the program. Note that the notion of stdin, stdout, and |
| 554 | * stderr in this function is sort of reversed: this function writes to |
| 555 | * stdin (of the child program), and reads from stdout and stderr (of the |
| 556 | * child program). |
| 557 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 558 | void |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 559 | server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 560 | { |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 561 | fd_set *readset = NULL, *writeset = NULL; |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 562 | int max_fd = 0; |
| 563 | u_int nalloc = 0; |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 564 | int wait_status; /* Status returned by wait(). */ |
| 565 | pid_t wait_pid; /* pid returned by wait(). */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 566 | int waiting_termination = 0; /* Have displayed waiting close message. */ |
Darren Tucker | 5f96f3b | 2013-05-16 20:29:28 +1000 | [diff] [blame] | 567 | u_int64_t max_time_milliseconds; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 568 | u_int previous_stdout_buffer_bytes; |
| 569 | u_int stdout_buffer_bytes; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 570 | int type; |
| 571 | |
| 572 | debug("Entering interactive session."); |
| 573 | |
| 574 | /* Initialize the SIGCHLD kludge. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 575 | child_terminated = 0; |
Kevin Steves | e26a155 | 2001-07-26 17:51:49 +0000 | [diff] [blame] | 576 | mysignal(SIGCHLD, sigchld_handler); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 577 | |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 578 | if (!use_privsep) { |
| 579 | signal(SIGTERM, sigterm_handler); |
| 580 | signal(SIGINT, sigterm_handler); |
| 581 | signal(SIGQUIT, sigterm_handler); |
| 582 | } |
| 583 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 584 | /* Initialize our global variables. */ |
| 585 | fdin = fdin_arg; |
| 586 | fdout = fdout_arg; |
| 587 | fderr = fderr_arg; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 588 | |
| 589 | /* nonblocking IO */ |
| 590 | set_nonblock(fdin); |
| 591 | set_nonblock(fdout); |
Damien Miller | 7d6656c | 2000-05-20 15:22:36 +1000 | [diff] [blame] | 592 | /* we don't have stderr for interactive terminal sessions, see below */ |
| 593 | if (fderr != -1) |
| 594 | set_nonblock(fderr); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 595 | |
Damien Miller | 225736c | 2001-02-19 21:51:08 +1100 | [diff] [blame] | 596 | if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin)) |
| 597 | fdin_is_tty = 1; |
| 598 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 599 | connection_in = packet_get_connection_in(); |
| 600 | connection_out = packet_get_connection_out(); |
| 601 | |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 602 | notify_setup(); |
| 603 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 604 | previous_stdout_buffer_bytes = 0; |
| 605 | |
| 606 | /* Set approximate I/O buffer size. */ |
| 607 | if (packet_is_interactive()) |
| 608 | buffer_high = 4096; |
| 609 | else |
| 610 | buffer_high = 64 * 1024; |
| 611 | |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 612 | #if 0 |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 613 | /* Initialize max_fd to the maximum of the known file descriptors. */ |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 614 | max_fd = MAX(connection_in, connection_out); |
| 615 | max_fd = MAX(max_fd, fdin); |
| 616 | max_fd = MAX(max_fd, fdout); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 617 | if (fderr != -1) |
| 618 | max_fd = MAX(max_fd, fderr); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 619 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 620 | |
| 621 | /* Initialize Initialize buffers. */ |
| 622 | buffer_init(&stdin_buffer); |
| 623 | buffer_init(&stdout_buffer); |
| 624 | buffer_init(&stderr_buffer); |
| 625 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 626 | /* |
| 627 | * If we have no separate fderr (which is the case when we have a pty |
| 628 | * - there we cannot make difference between data sent to stdout and |
| 629 | * stderr), indicate that we have seen an EOF from stderr. This way |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 630 | * we don't need to check the descriptor everywhere. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 631 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 632 | if (fderr == -1) |
| 633 | fderr_eof = 1; |
| 634 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 635 | server_init_dispatch(); |
| 636 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 637 | /* Main loop of the server for the interactive session mode. */ |
| 638 | for (;;) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 639 | |
| 640 | /* Process buffered packets from the client. */ |
| 641 | process_buffered_input_packets(); |
| 642 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 643 | /* |
| 644 | * If we have received eof, and there is no more pending |
| 645 | * input data, cause a real eof by closing fdin. |
| 646 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 647 | if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 648 | if (fdin != fdout) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 649 | close(fdin); |
| 650 | else |
| 651 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 652 | fdin = -1; |
| 653 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 654 | /* Make packets from buffered stderr data to send to the client. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 655 | make_packets_from_stderr_data(); |
| 656 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 657 | /* |
| 658 | * Make packets from buffered stdout data to send to the |
| 659 | * client. If there is very little to send, this arranges to |
| 660 | * not send them now, but to wait a short while to see if we |
| 661 | * are getting more data. This is necessary, as some systems |
| 662 | * wake up readers from a pty after each separate character. |
| 663 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 664 | max_time_milliseconds = 0; |
| 665 | stdout_buffer_bytes = buffer_len(&stdout_buffer); |
| 666 | if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 && |
| 667 | stdout_buffer_bytes != previous_stdout_buffer_bytes) { |
| 668 | /* try again after a while */ |
| 669 | max_time_milliseconds = 10; |
| 670 | } else { |
| 671 | /* Send it now. */ |
| 672 | make_packets_from_stdout_data(); |
| 673 | } |
| 674 | previous_stdout_buffer_bytes = buffer_len(&stdout_buffer); |
| 675 | |
| 676 | /* Send channel data to the client. */ |
| 677 | if (packet_not_very_much_data_to_write()) |
| 678 | channel_output_poll(); |
| 679 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 680 | /* |
| 681 | * Bail out of the loop if the program has closed its output |
| 682 | * descriptors, and we have no more data to send to the |
| 683 | * client, and there is no pending buffered data. |
| 684 | */ |
Damien Miller | 43dc8da | 2000-11-29 15:55:17 +1100 | [diff] [blame] | 685 | if (fdout_eof && fderr_eof && !packet_have_data_to_write() && |
| 686 | buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 687 | if (!channel_still_open()) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 688 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 689 | if (!waiting_termination) { |
| 690 | const char *s = "Waiting for forwarded connections to terminate...\r\n"; |
| 691 | char *cp; |
| 692 | waiting_termination = 1; |
| 693 | buffer_append(&stderr_buffer, s, strlen(s)); |
| 694 | |
| 695 | /* Display list of open channels. */ |
| 696 | cp = channel_open_message(); |
| 697 | buffer_append(&stderr_buffer, cp, strlen(cp)); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 698 | free(cp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 699 | } |
| 700 | } |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 701 | max_fd = MAX(connection_in, connection_out); |
| 702 | max_fd = MAX(max_fd, fdin); |
| 703 | max_fd = MAX(max_fd, fdout); |
| 704 | max_fd = MAX(max_fd, fderr); |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 705 | max_fd = MAX(max_fd, notify_pipe[0]); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 706 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 707 | /* Sleep in select() until we can do something. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 708 | wait_until_can_do_something(&readset, &writeset, &max_fd, |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 709 | &nalloc, max_time_milliseconds); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 710 | |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 711 | if (received_sigterm) { |
Darren Tucker | 3e1027c | 2012-12-07 13:07:46 +1100 | [diff] [blame] | 712 | logit("Exiting on signal %d", (int)received_sigterm); |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 713 | /* Clean up sessions, utmp, etc. */ |
| 714 | cleanup_exit(255); |
| 715 | } |
| 716 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 717 | /* Process any channel events. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 718 | channel_after_select(readset, writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 719 | |
| 720 | /* Process input from the client and from program stdout/stderr. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 721 | process_input(readset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 722 | |
| 723 | /* Process output to the client and to program stdin. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 724 | process_output(writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 725 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 726 | free(readset); |
| 727 | free(writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 728 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 729 | /* Cleanup and termination code. */ |
| 730 | |
| 731 | /* Wait until all output has been sent to the client. */ |
| 732 | drain_output(); |
| 733 | |
| 734 | debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 735 | stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 736 | |
| 737 | /* Free and clear the buffers. */ |
| 738 | buffer_free(&stdin_buffer); |
| 739 | buffer_free(&stdout_buffer); |
| 740 | buffer_free(&stderr_buffer); |
| 741 | |
| 742 | /* Close the file descriptors. */ |
| 743 | if (fdout != -1) |
| 744 | close(fdout); |
| 745 | fdout = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 746 | fdout_eof = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 747 | if (fderr != -1) |
| 748 | close(fderr); |
| 749 | fderr = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 750 | fderr_eof = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 751 | if (fdin != -1) |
| 752 | close(fdin); |
| 753 | fdin = -1; |
| 754 | |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 755 | channel_free_all(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 756 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 757 | /* We no longer want our SIGCHLD handler to be called. */ |
Kevin Steves | e26a155 | 2001-07-26 17:51:49 +0000 | [diff] [blame] | 758 | mysignal(SIGCHLD, SIG_DFL); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 759 | |
Ben Lindstrom | 47fd811 | 2002-04-02 20:48:19 +0000 | [diff] [blame] | 760 | while ((wait_pid = waitpid(-1, &wait_status, 0)) < 0) |
| 761 | if (errno != EINTR) |
| 762 | packet_disconnect("wait: %.100s", strerror(errno)); |
| 763 | if (wait_pid != pid) |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 764 | error("Strange, wait returned pid %ld, expected %ld", |
| 765 | (long)wait_pid, (long)pid); |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 766 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 767 | /* Check if it exited normally. */ |
| 768 | if (WIFEXITED(wait_status)) { |
| 769 | /* Yes, normal exit. Get exit status and send it to the client. */ |
| 770 | debug("Command exited with status %d.", WEXITSTATUS(wait_status)); |
| 771 | packet_start(SSH_SMSG_EXITSTATUS); |
| 772 | packet_put_int(WEXITSTATUS(wait_status)); |
| 773 | packet_send(); |
| 774 | packet_write_wait(); |
| 775 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 776 | /* |
| 777 | * Wait for exit confirmation. Note that there might be |
| 778 | * other packets coming before it; however, the program has |
| 779 | * already died so we just ignore them. The client is |
| 780 | * supposed to respond with the confirmation when it receives |
| 781 | * the exit status. |
| 782 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 783 | do { |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 784 | type = packet_read(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 785 | } |
| 786 | while (type != SSH_CMSG_EXIT_CONFIRMATION); |
| 787 | |
| 788 | debug("Received exit confirmation."); |
| 789 | return; |
| 790 | } |
| 791 | /* Check if the program terminated due to a signal. */ |
| 792 | if (WIFSIGNALED(wait_status)) |
| 793 | packet_disconnect("Command terminated on signal %d.", |
| 794 | WTERMSIG(wait_status)); |
| 795 | |
| 796 | /* Some weird exit cause. Just exit. */ |
| 797 | packet_disconnect("wait returned status %04x.", wait_status); |
| 798 | /* NOTREACHED */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 799 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 800 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 801 | static void |
| 802 | collect_children(void) |
| 803 | { |
| 804 | pid_t pid; |
| 805 | sigset_t oset, nset; |
| 806 | int status; |
| 807 | |
| 808 | /* block SIGCHLD while we check for dead children */ |
| 809 | sigemptyset(&nset); |
| 810 | sigaddset(&nset, SIGCHLD); |
| 811 | sigprocmask(SIG_BLOCK, &nset, &oset); |
| 812 | if (child_terminated) { |
Damien Miller | ec04f36 | 2006-03-15 12:01:34 +1100 | [diff] [blame] | 813 | debug("Received SIGCHLD."); |
Ben Lindstrom | 47fd811 | 2002-04-02 20:48:19 +0000 | [diff] [blame] | 814 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || |
| 815 | (pid < 0 && errno == EINTR)) |
| 816 | if (pid > 0) |
| 817 | session_close_by_pid(pid, status); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 818 | child_terminated = 0; |
| 819 | } |
| 820 | sigprocmask(SIG_SETMASK, &oset, NULL); |
| 821 | } |
| 822 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 823 | void |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 824 | server_loop2(Authctxt *authctxt) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 825 | { |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 826 | fd_set *readset = NULL, *writeset = NULL; |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 827 | int max_fd; |
Damien Miller | ce98654 | 2013-07-18 16:12:44 +1000 | [diff] [blame] | 828 | u_int nalloc = 0; |
Darren Tucker | 5f96f3b | 2013-05-16 20:29:28 +1000 | [diff] [blame] | 829 | u_int64_t rekey_timeout_ms = 0; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 830 | |
| 831 | debug("Entering interactive session for SSH2."); |
| 832 | |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 833 | mysignal(SIGCHLD, sigchld_handler); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 834 | child_terminated = 0; |
| 835 | connection_in = packet_get_connection_in(); |
| 836 | connection_out = packet_get_connection_out(); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 837 | |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 838 | if (!use_privsep) { |
| 839 | signal(SIGTERM, sigterm_handler); |
| 840 | signal(SIGINT, sigterm_handler); |
| 841 | signal(SIGQUIT, sigterm_handler); |
| 842 | } |
| 843 | |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 844 | notify_setup(); |
| 845 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 846 | max_fd = MAX(connection_in, connection_out); |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 847 | max_fd = MAX(max_fd, notify_pipe[0]); |
| 848 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 849 | server_init_dispatch(); |
| 850 | |
| 851 | for (;;) { |
| 852 | process_buffered_input_packets(); |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 853 | |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 854 | if (!ssh_packet_is_rekeying(active_state) && |
| 855 | packet_not_very_much_data_to_write()) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 856 | channel_output_poll(); |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 857 | if (options.rekey_interval > 0 && compat20 && |
| 858 | !ssh_packet_is_rekeying(active_state)) |
Darren Tucker | 5f96f3b | 2013-05-16 20:29:28 +1000 | [diff] [blame] | 859 | rekey_timeout_ms = packet_get_rekey_timeout() * 1000; |
| 860 | else |
| 861 | rekey_timeout_ms = 0; |
| 862 | |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 863 | wait_until_can_do_something(&readset, &writeset, &max_fd, |
Darren Tucker | 5f96f3b | 2013-05-16 20:29:28 +1000 | [diff] [blame] | 864 | &nalloc, rekey_timeout_ms); |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 865 | |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 866 | if (received_sigterm) { |
Darren Tucker | 3e1027c | 2012-12-07 13:07:46 +1100 | [diff] [blame] | 867 | logit("Exiting on signal %d", (int)received_sigterm); |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 868 | /* Clean up sessions, utmp, etc. */ |
| 869 | cleanup_exit(255); |
| 870 | } |
| 871 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 872 | collect_children(); |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 873 | if (!ssh_packet_is_rekeying(active_state)) |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 874 | channel_after_select(readset, writeset); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 875 | process_input(readset); |
Ben Lindstrom | e34ab4c | 2001-04-07 01:12:11 +0000 | [diff] [blame] | 876 | if (connection_closed) |
| 877 | break; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 878 | process_output(writeset); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 879 | } |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 880 | collect_children(); |
| 881 | |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 882 | free(readset); |
| 883 | free(writeset); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 884 | |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 885 | /* free all channels, no more reads and writes */ |
| 886 | channel_free_all(); |
Ben Lindstrom | 4983d5e | 2001-07-04 05:17:40 +0000 | [diff] [blame] | 887 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 888 | /* free remaining sessions, e.g. remove wtmp entries */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 889 | session_destroy_all(NULL); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 890 | } |
| 891 | |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 892 | static int |
Damien Miller | b5820f4 | 2003-12-17 16:27:32 +1100 | [diff] [blame] | 893 | server_input_keep_alive(int type, u_int32_t seq, void *ctxt) |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 894 | { |
Damien Miller | b5820f4 | 2003-12-17 16:27:32 +1100 | [diff] [blame] | 895 | debug("Got %d/%u for keepalive", type, seq); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 896 | /* |
Ben Lindstrom | 2f0304c | 2001-04-29 19:49:14 +0000 | [diff] [blame] | 897 | * reset timeout, since we got a sane answer from the client. |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 898 | * even if this was generated by something other than |
| 899 | * the bogus CHANNEL_REQUEST we send for keepalives. |
| 900 | */ |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 901 | packet_set_alive_timeouts(0); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 902 | return 0; |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 903 | } |
| 904 | |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 905 | static int |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 906 | server_input_stdin_data(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 907 | { |
| 908 | char *data; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 909 | u_int data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 910 | |
| 911 | /* Stdin data from the client. Append it to the buffer. */ |
| 912 | /* Ignore any data if the client has closed stdin. */ |
| 913 | if (fdin == -1) |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 914 | return 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 915 | data = packet_get_string(&data_len); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 916 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 917 | buffer_append(&stdin_buffer, data, data_len); |
Damien Miller | a5103f4 | 2014-02-04 11:20:14 +1100 | [diff] [blame] | 918 | explicit_bzero(data, data_len); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 919 | free(data); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 920 | return 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 921 | } |
| 922 | |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 923 | static int |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 924 | server_input_eof(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 925 | { |
| 926 | /* |
| 927 | * Eof from the client. The stdin descriptor to the |
| 928 | * program will be closed when all buffered data has |
| 929 | * drained. |
| 930 | */ |
| 931 | debug("EOF received for stdin."); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 932 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 933 | stdin_eof = 1; |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 934 | return 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 935 | } |
| 936 | |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 937 | static int |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 938 | server_input_window_size(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 939 | { |
Damien Miller | 71a7367 | 2006-03-26 14:04:36 +1100 | [diff] [blame] | 940 | u_int row = packet_get_int(); |
| 941 | u_int col = packet_get_int(); |
| 942 | u_int xpixel = packet_get_int(); |
| 943 | u_int ypixel = packet_get_int(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 944 | |
| 945 | debug("Window change received."); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 946 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 947 | if (fdin != -1) |
| 948 | pty_change_window_size(fdin, row, col, xpixel, ypixel); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 949 | return 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 950 | } |
| 951 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 952 | static Channel * |
Damien Miller | fb1310e | 2004-01-21 11:02:50 +1100 | [diff] [blame] | 953 | server_request_direct_tcpip(void) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 954 | { |
Damien Miller | aa5b3f8 | 2012-12-03 09:50:54 +1100 | [diff] [blame] | 955 | Channel *c = NULL; |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 956 | char *target, *originator; |
Damien Miller | 3dc71ad | 2009-01-28 16:31:22 +1100 | [diff] [blame] | 957 | u_short target_port, originator_port; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 958 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 959 | target = packet_get_string(NULL); |
| 960 | target_port = packet_get_int(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 961 | originator = packet_get_string(NULL); |
| 962 | originator_port = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 963 | packet_check_eom(); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 964 | |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 965 | debug("server_request_direct_tcpip: originator %s port %d, target %s " |
| 966 | "port %d", originator, originator_port, target, target_port); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 967 | |
Damien Miller | aa5b3f8 | 2012-12-03 09:50:54 +1100 | [diff] [blame] | 968 | /* XXX fine grained permissions */ |
| 969 | if ((options.allow_tcp_forwarding & FORWARD_LOCAL) != 0 && |
| 970 | !no_port_forwarding_flag) { |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 971 | c = channel_connect_to_port(target, target_port, |
Damien Miller | aa5b3f8 | 2012-12-03 09:50:54 +1100 | [diff] [blame] | 972 | "direct-tcpip", "direct-tcpip"); |
| 973 | } else { |
| 974 | logit("refused local port forward: " |
| 975 | "originator %s port %d, target %s port %d", |
| 976 | originator, originator_port, target, target_port); |
| 977 | } |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 978 | |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 979 | free(originator); |
| 980 | free(target); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 981 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 982 | return c; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 983 | } |
| 984 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 985 | static Channel * |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 986 | server_request_direct_streamlocal(void) |
| 987 | { |
| 988 | Channel *c = NULL; |
| 989 | char *target, *originator; |
| 990 | u_short originator_port; |
| 991 | |
| 992 | target = packet_get_string(NULL); |
| 993 | originator = packet_get_string(NULL); |
| 994 | originator_port = packet_get_int(); |
| 995 | packet_check_eom(); |
| 996 | |
| 997 | debug("server_request_direct_streamlocal: originator %s port %d, target %s", |
| 998 | originator, originator_port, target); |
| 999 | |
| 1000 | /* XXX fine grained permissions */ |
| 1001 | if ((options.allow_streamlocal_forwarding & FORWARD_LOCAL) != 0 && |
| 1002 | !no_port_forwarding_flag) { |
| 1003 | c = channel_connect_to_path(target, |
| 1004 | "direct-streamlocal@openssh.com", "direct-streamlocal"); |
| 1005 | } else { |
| 1006 | logit("refused streamlocal port forward: " |
| 1007 | "originator %s port %d, target %s", |
| 1008 | originator, originator_port, target); |
| 1009 | } |
| 1010 | |
| 1011 | free(originator); |
| 1012 | free(target); |
| 1013 | |
| 1014 | return c; |
| 1015 | } |
| 1016 | |
| 1017 | static Channel * |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1018 | server_request_tun(void) |
| 1019 | { |
| 1020 | Channel *c = NULL; |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 1021 | int mode, tun; |
| 1022 | int sock; |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1023 | |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 1024 | mode = packet_get_int(); |
| 1025 | switch (mode) { |
| 1026 | case SSH_TUNMODE_POINTOPOINT: |
| 1027 | case SSH_TUNMODE_ETHERNET: |
| 1028 | break; |
| 1029 | default: |
| 1030 | packet_send_debug("Unsupported tunnel device mode."); |
| 1031 | return NULL; |
| 1032 | } |
| 1033 | if ((options.permit_tun & mode) == 0) { |
| 1034 | packet_send_debug("Server has rejected tunnel device " |
| 1035 | "forwarding"); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1036 | return NULL; |
| 1037 | } |
| 1038 | |
| 1039 | tun = packet_get_int(); |
Darren Tucker | 0d0e8f0 | 2005-12-20 16:08:42 +1100 | [diff] [blame] | 1040 | if (forced_tun_device != -1) { |
Damien Miller | f0b15df | 2006-03-26 13:59:20 +1100 | [diff] [blame] | 1041 | if (tun != SSH_TUNID_ANY && forced_tun_device != tun) |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1042 | goto done; |
| 1043 | tun = forced_tun_device; |
| 1044 | } |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 1045 | sock = tun_open(tun, mode); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1046 | if (sock < 0) |
| 1047 | goto done; |
| 1048 | c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1, |
| 1049 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); |
| 1050 | c->datagram = 1; |
Damien Miller | 598bbc2 | 2005-12-31 16:33:36 +1100 | [diff] [blame] | 1051 | #if defined(SSH_TUN_FILTER) |
| 1052 | if (mode == SSH_TUNMODE_POINTOPOINT) |
| 1053 | channel_register_filter(c->self, sys_tun_infilter, |
Darren Tucker | 1cf65ae | 2008-06-13 05:09:18 +1000 | [diff] [blame] | 1054 | sys_tun_outfilter, NULL, NULL); |
Damien Miller | 598bbc2 | 2005-12-31 16:33:36 +1100 | [diff] [blame] | 1055 | #endif |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1056 | |
| 1057 | done: |
| 1058 | if (c == NULL) |
| 1059 | packet_send_debug("Failed to open the tunnel device."); |
| 1060 | return c; |
| 1061 | } |
| 1062 | |
| 1063 | static Channel * |
Damien Miller | fb1310e | 2004-01-21 11:02:50 +1100 | [diff] [blame] | 1064 | server_request_session(void) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1065 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1066 | Channel *c; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1067 | |
| 1068 | debug("input_session_request"); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1069 | packet_check_eom(); |
Darren Tucker | 8901fa9 | 2008-06-11 09:34:01 +1000 | [diff] [blame] | 1070 | |
| 1071 | if (no_more_sessions) { |
| 1072 | packet_disconnect("Possible attack: attempt to open a session " |
| 1073 | "after additional sessions disabled"); |
| 1074 | } |
| 1075 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1076 | /* |
| 1077 | * A server session has no fd to read or write until a |
| 1078 | * CHANNEL_REQUEST for a shell is made, so we set the type to |
| 1079 | * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all |
| 1080 | * CHANNEL_REQUEST messages is registered. |
| 1081 | */ |
Damien Miller | fb1310e | 2004-01-21 11:02:50 +1100 | [diff] [blame] | 1082 | c = channel_new("session", SSH_CHANNEL_LARVAL, |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1083 | -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1084 | 0, "server-session", 1); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1085 | if (session_open(the_authctxt, c->self) != 1) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1086 | debug("session open failed, free channel %d", c->self); |
| 1087 | channel_free(c); |
| 1088 | return NULL; |
| 1089 | } |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 1090 | channel_register_cleanup(c->self, session_close_by_channel, 0); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1091 | return c; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1092 | } |
| 1093 | |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 1094 | static int |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1095 | server_input_channel_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1096 | { |
| 1097 | Channel *c = NULL; |
| 1098 | char *ctype; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1099 | int rchan; |
Ben Lindstrom | 4fed2be | 2002-06-25 23:17:36 +0000 | [diff] [blame] | 1100 | u_int rmaxpack, rwindow, len; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1101 | |
| 1102 | ctype = packet_get_string(&len); |
| 1103 | rchan = packet_get_int(); |
| 1104 | rwindow = packet_get_int(); |
| 1105 | rmaxpack = packet_get_int(); |
| 1106 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1107 | debug("server_input_channel_open: ctype %s rchan %d win %d max %d", |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1108 | ctype, rchan, rwindow, rmaxpack); |
| 1109 | |
| 1110 | if (strcmp(ctype, "session") == 0) { |
Damien Miller | fb1310e | 2004-01-21 11:02:50 +1100 | [diff] [blame] | 1111 | c = server_request_session(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1112 | } else if (strcmp(ctype, "direct-tcpip") == 0) { |
Damien Miller | fb1310e | 2004-01-21 11:02:50 +1100 | [diff] [blame] | 1113 | c = server_request_direct_tcpip(); |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1114 | } else if (strcmp(ctype, "direct-streamlocal@openssh.com") == 0) { |
| 1115 | c = server_request_direct_streamlocal(); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1116 | } else if (strcmp(ctype, "tun@openssh.com") == 0) { |
| 1117 | c = server_request_tun(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1118 | } |
| 1119 | if (c != NULL) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1120 | debug("server_input_channel_open: confirm %s", ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1121 | c->remote_id = rchan; |
| 1122 | c->remote_window = rwindow; |
| 1123 | c->remote_maxpacket = rmaxpack; |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1124 | if (c->type != SSH_CHANNEL_CONNECTING) { |
| 1125 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1126 | packet_put_int(c->remote_id); |
| 1127 | packet_put_int(c->self); |
| 1128 | packet_put_int(c->local_window); |
| 1129 | packet_put_int(c->local_maxpacket); |
| 1130 | packet_send(); |
| 1131 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1132 | } else { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1133 | debug("server_input_channel_open: failure %s", ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1134 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
| 1135 | packet_put_int(rchan); |
| 1136 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 1137 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1138 | packet_put_cstring("open failed"); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 1139 | packet_put_cstring(""); |
| 1140 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1141 | packet_send(); |
| 1142 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1143 | free(ctype); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 1144 | return 0; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1145 | } |
| 1146 | |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 1147 | static int |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 1148 | server_input_hostkeys_prove(struct sshbuf **respp) |
| 1149 | { |
| 1150 | struct ssh *ssh = active_state; /* XXX */ |
| 1151 | struct sshbuf *resp = NULL; |
| 1152 | struct sshbuf *sigbuf = NULL; |
| 1153 | struct sshkey *key = NULL, *key_pub = NULL, *key_prv = NULL; |
| 1154 | int r, ndx, success = 0; |
| 1155 | const u_char *blob; |
| 1156 | u_char *sig = 0; |
| 1157 | size_t blen, slen; |
| 1158 | |
| 1159 | if ((resp = sshbuf_new()) == NULL || (sigbuf = sshbuf_new()) == NULL) |
| 1160 | fatal("%s: sshbuf_new", __func__); |
| 1161 | |
| 1162 | while (ssh_packet_remaining(ssh) > 0) { |
| 1163 | sshkey_free(key); |
| 1164 | key = NULL; |
| 1165 | if ((r = sshpkt_get_string_direct(ssh, &blob, &blen)) != 0 || |
| 1166 | (r = sshkey_from_blob(blob, blen, &key)) != 0) { |
| 1167 | error("%s: couldn't parse key: %s", |
| 1168 | __func__, ssh_err(r)); |
| 1169 | goto out; |
| 1170 | } |
| 1171 | /* |
| 1172 | * Better check that this is actually one of our hostkeys |
| 1173 | * before attempting to sign anything with it. |
| 1174 | */ |
| 1175 | if ((ndx = ssh->kex->host_key_index(key, 1, ssh)) == -1) { |
| 1176 | error("%s: unknown host %s key", |
| 1177 | __func__, sshkey_type(key)); |
| 1178 | goto out; |
| 1179 | } |
| 1180 | /* |
| 1181 | * XXX refactor: make kex->sign just use an index rather |
| 1182 | * than passing in public and private keys |
| 1183 | */ |
| 1184 | if ((key_prv = get_hostkey_by_index(ndx)) == NULL && |
| 1185 | (key_pub = get_hostkey_public_by_index(ndx, ssh)) == NULL) { |
| 1186 | error("%s: can't retrieve hostkey %d", __func__, ndx); |
| 1187 | goto out; |
| 1188 | } |
| 1189 | sshbuf_reset(sigbuf); |
| 1190 | free(sig); |
| 1191 | sig = NULL; |
djm@openbsd.org | 44732de | 2015-02-20 22:17:21 +0000 | [diff] [blame] | 1192 | if ((r = sshbuf_put_cstring(sigbuf, |
| 1193 | "hostkeys-prove-00@openssh.com")) != 0 || |
| 1194 | (r = sshbuf_put_string(sigbuf, |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 1195 | ssh->kex->session_id, ssh->kex->session_id_len)) != 0 || |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 1196 | (r = sshkey_puts(key, sigbuf)) != 0 || |
| 1197 | (r = ssh->kex->sign(key_prv, key_pub, &sig, &slen, |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 1198 | sshbuf_ptr(sigbuf), sshbuf_len(sigbuf), NULL, 0)) != 0 || |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 1199 | (r = sshbuf_put_string(resp, sig, slen)) != 0) { |
| 1200 | error("%s: couldn't prepare signature: %s", |
| 1201 | __func__, ssh_err(r)); |
| 1202 | goto out; |
| 1203 | } |
| 1204 | } |
| 1205 | /* Success */ |
| 1206 | *respp = resp; |
| 1207 | resp = NULL; /* don't free it */ |
| 1208 | success = 1; |
| 1209 | out: |
| 1210 | free(sig); |
| 1211 | sshbuf_free(resp); |
| 1212 | sshbuf_free(sigbuf); |
| 1213 | sshkey_free(key); |
| 1214 | return success; |
| 1215 | } |
| 1216 | |
| 1217 | static int |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1218 | server_input_global_request(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1219 | { |
| 1220 | char *rtype; |
| 1221 | int want_reply; |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 1222 | int r, success = 0, allocated_listen_port = 0; |
| 1223 | struct sshbuf *resp = NULL; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1224 | |
| 1225 | rtype = packet_get_string(NULL); |
| 1226 | want_reply = packet_get_char(); |
| 1227 | debug("server_input_global_request: rtype %s want_reply %d", rtype, want_reply); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1228 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 1229 | /* -R style forwarding */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1230 | if (strcmp(rtype, "tcpip-forward") == 0) { |
| 1231 | struct passwd *pw; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1232 | struct Forward fwd; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1233 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1234 | pw = the_authctxt->pw; |
Damien Miller | 4bb1dd3 | 2003-11-18 22:01:25 +1100 | [diff] [blame] | 1235 | if (pw == NULL || !the_authctxt->valid) |
Damien Miller | 3e3b514 | 2003-11-17 21:13:40 +1100 | [diff] [blame] | 1236 | fatal("server_input_global_request: no/invalid user"); |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1237 | memset(&fwd, 0, sizeof(fwd)); |
| 1238 | fwd.listen_host = packet_get_string(NULL); |
| 1239 | fwd.listen_port = (u_short)packet_get_int(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1240 | debug("server_input_global_request: tcpip-forward listen %s port %d", |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1241 | fwd.listen_host, fwd.listen_port); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1242 | |
| 1243 | /* check permissions */ |
Damien Miller | aa5b3f8 | 2012-12-03 09:50:54 +1100 | [diff] [blame] | 1244 | if ((options.allow_tcp_forwarding & FORWARD_REMOTE) == 0 || |
Damien Miller | 330d585 | 2009-02-14 16:33:09 +1100 | [diff] [blame] | 1245 | no_port_forwarding_flag || |
Darren Tucker | 5f41f03 | 2016-04-08 21:14:13 +1000 | [diff] [blame] | 1246 | (!want_reply && fwd.listen_port == 0) || |
| 1247 | (fwd.listen_port != 0 && fwd.listen_port < IPPORT_RESERVED && |
| 1248 | pw->pw_uid != 0)) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1249 | success = 0; |
| 1250 | packet_send_debug("Server has disabled port forwarding."); |
| 1251 | } else { |
| 1252 | /* Start listening on the port */ |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1253 | success = channel_setup_remote_fwd_listener(&fwd, |
| 1254 | &allocated_listen_port, &options.fwd_opts); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1255 | } |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1256 | free(fwd.listen_host); |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 1257 | if ((resp = sshbuf_new()) == NULL) |
| 1258 | fatal("%s: sshbuf_new", __func__); |
djm@openbsd.org | b1d6b39 | 2015-11-28 06:41:03 +0000 | [diff] [blame] | 1259 | if (allocated_listen_port != 0 && |
| 1260 | (r = sshbuf_put_u32(resp, allocated_listen_port)) != 0) |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 1261 | fatal("%s: sshbuf_put_u32: %s", __func__, ssh_err(r)); |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 1262 | } else if (strcmp(rtype, "cancel-tcpip-forward") == 0) { |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1263 | struct Forward fwd; |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 1264 | |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1265 | memset(&fwd, 0, sizeof(fwd)); |
| 1266 | fwd.listen_host = packet_get_string(NULL); |
| 1267 | fwd.listen_port = (u_short)packet_get_int(); |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 1268 | debug("%s: cancel-tcpip-forward addr %s port %d", __func__, |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1269 | fwd.listen_host, fwd.listen_port); |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 1270 | |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1271 | success = channel_cancel_rport_listener(&fwd); |
| 1272 | free(fwd.listen_host); |
| 1273 | } else if (strcmp(rtype, "streamlocal-forward@openssh.com") == 0) { |
| 1274 | struct Forward fwd; |
| 1275 | |
| 1276 | memset(&fwd, 0, sizeof(fwd)); |
| 1277 | fwd.listen_path = packet_get_string(NULL); |
| 1278 | debug("server_input_global_request: streamlocal-forward listen path %s", |
| 1279 | fwd.listen_path); |
| 1280 | |
| 1281 | /* check permissions */ |
| 1282 | if ((options.allow_streamlocal_forwarding & FORWARD_REMOTE) == 0 |
| 1283 | || no_port_forwarding_flag) { |
| 1284 | success = 0; |
| 1285 | packet_send_debug("Server has disabled port forwarding."); |
| 1286 | } else { |
| 1287 | /* Start listening on the socket */ |
| 1288 | success = channel_setup_remote_fwd_listener( |
| 1289 | &fwd, NULL, &options.fwd_opts); |
| 1290 | } |
| 1291 | free(fwd.listen_path); |
| 1292 | } else if (strcmp(rtype, "cancel-streamlocal-forward@openssh.com") == 0) { |
| 1293 | struct Forward fwd; |
| 1294 | |
| 1295 | memset(&fwd, 0, sizeof(fwd)); |
| 1296 | fwd.listen_path = packet_get_string(NULL); |
| 1297 | debug("%s: cancel-streamlocal-forward path %s", __func__, |
| 1298 | fwd.listen_path); |
| 1299 | |
| 1300 | success = channel_cancel_rport_listener(&fwd); |
| 1301 | free(fwd.listen_path); |
Darren Tucker | 8901fa9 | 2008-06-11 09:34:01 +1000 | [diff] [blame] | 1302 | } else if (strcmp(rtype, "no-more-sessions@openssh.com") == 0) { |
| 1303 | no_more_sessions = 1; |
| 1304 | success = 1; |
djm@openbsd.org | 44732de | 2015-02-20 22:17:21 +0000 | [diff] [blame] | 1305 | } else if (strcmp(rtype, "hostkeys-prove-00@openssh.com") == 0) { |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 1306 | success = server_input_hostkeys_prove(&resp); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1307 | } |
| 1308 | if (want_reply) { |
| 1309 | packet_start(success ? |
| 1310 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 1311 | if (success && resp != NULL) |
| 1312 | ssh_packet_put_raw(active_state, sshbuf_ptr(resp), |
| 1313 | sshbuf_len(resp)); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1314 | packet_send(); |
| 1315 | packet_write_wait(); |
| 1316 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1317 | free(rtype); |
djm@openbsd.org | 523463a | 2015-02-16 22:13:32 +0000 | [diff] [blame] | 1318 | sshbuf_free(resp); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 1319 | return 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1320 | } |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 1321 | |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 1322 | static int |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1323 | server_input_channel_req(int type, u_int32_t seq, void *ctxt) |
| 1324 | { |
| 1325 | Channel *c; |
| 1326 | int id, reply, success = 0; |
| 1327 | char *rtype; |
| 1328 | |
| 1329 | id = packet_get_int(); |
| 1330 | rtype = packet_get_string(NULL); |
| 1331 | reply = packet_get_char(); |
| 1332 | |
| 1333 | debug("server_input_channel_req: channel %d request %s reply %d", |
| 1334 | id, rtype, reply); |
| 1335 | |
| 1336 | if ((c = channel_lookup(id)) == NULL) |
| 1337 | packet_disconnect("server_input_channel_req: " |
| 1338 | "unknown channel %d", id); |
Damien Miller | bab9bd4 | 2008-05-19 16:06:47 +1000 | [diff] [blame] | 1339 | if (!strcmp(rtype, "eow@openssh.com")) { |
| 1340 | packet_check_eom(); |
| 1341 | chan_rcvd_eow(c); |
Darren Tucker | 8810dd4 | 2008-07-02 22:32:14 +1000 | [diff] [blame] | 1342 | } else if ((c->type == SSH_CHANNEL_LARVAL || |
| 1343 | c->type == SSH_CHANNEL_OPEN) && strcmp(c->ctype, "session") == 0) |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1344 | success = session_input_channel_req(c, rtype); |
Damien Miller | c589378 | 2014-05-15 13:48:49 +1000 | [diff] [blame] | 1345 | if (reply && !(c->flags & CHAN_CLOSE_SENT)) { |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1346 | packet_start(success ? |
| 1347 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); |
| 1348 | packet_put_int(c->remote_id); |
| 1349 | packet_send(); |
| 1350 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1351 | free(rtype); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 1352 | return 0; |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1353 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1354 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1355 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1356 | server_init_dispatch_20(void) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1357 | { |
| 1358 | debug("server_init_dispatch_20"); |
| 1359 | dispatch_init(&dispatch_protocol_error); |
| 1360 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
| 1361 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); |
| 1362 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); |
| 1363 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); |
| 1364 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open); |
| 1365 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 1366 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1367 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &server_input_channel_req); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1368 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1369 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request); |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 1370 | /* client_alive */ |
Damien Miller | 5a33ec6 | 2008-12-08 09:55:02 +1100 | [diff] [blame] | 1371 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &server_input_keep_alive); |
| 1372 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_keep_alive); |
Damien Miller | b5820f4 | 2003-12-17 16:27:32 +1100 | [diff] [blame] | 1373 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &server_input_keep_alive); |
| 1374 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &server_input_keep_alive); |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 1375 | /* rekeying */ |
| 1376 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1377 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1378 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1379 | server_init_dispatch_13(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1380 | { |
| 1381 | debug("server_init_dispatch_13"); |
| 1382 | dispatch_init(NULL); |
| 1383 | dispatch_set(SSH_CMSG_EOF, &server_input_eof); |
| 1384 | dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data); |
| 1385 | dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size); |
| 1386 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); |
| 1387 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); |
| 1388 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); |
| 1389 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 1390 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
| 1391 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); |
| 1392 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1393 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1394 | server_init_dispatch_15(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1395 | { |
| 1396 | server_init_dispatch_13(); |
| 1397 | debug("server_init_dispatch_15"); |
| 1398 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); |
| 1399 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose); |
| 1400 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1401 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1402 | server_init_dispatch(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1403 | { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1404 | if (compat20) |
| 1405 | server_init_dispatch_20(); |
| 1406 | else if (compat13) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1407 | server_init_dispatch_13(); |
| 1408 | else |
| 1409 | server_init_dispatch_15(); |
| 1410 | } |