Damien Miller | ce98654 | 2013-07-18 16:12:44 +1000 | [diff] [blame] | 1 | /* $OpenBSD: serverloop.c,v 1.168 2013/07/12 00:19:59 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 | |
| 40 | #include <sys/types.h> |
Damien Miller | 8dbffe7 | 2006-08-05 11:02:17 +1000 | [diff] [blame] | 41 | #include <sys/param.h> |
Damien Miller | 9cf6d07 | 2006-03-15 11:29:24 +1100 | [diff] [blame] | 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 | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 64 | #include "servconf.h" |
Damien Miller | 16aed05 | 2002-09-22 01:26:27 +1000 | [diff] [blame] | 65 | #include "canohost.h" |
Ben Lindstrom | d95c09c | 2001-02-18 19:13:33 +0000 | [diff] [blame] | 66 | #include "sshpty.h" |
Ben Lindstrom | c763767 | 2001-06-09 00:36:26 +0000 | [diff] [blame] | 67 | #include "channels.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 68 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 69 | #include "ssh1.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 70 | #include "ssh2.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 71 | #include "key.h" |
| 72 | #include "cipher.h" |
| 73 | #include "kex.h" |
| 74 | #include "hostfile.h" |
Ben Lindstrom | db65e8f | 2001-01-19 04:26:52 +0000 | [diff] [blame] | 75 | #include "auth.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 76 | #include "session.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 77 | #include "dispatch.h" |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 78 | #include "auth-options.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 79 | #include "serverloop.h" |
| 80 | #include "misc.h" |
Darren Tucker | c5564e1 | 2009-06-21 18:53:53 +1000 | [diff] [blame] | 81 | #include "roaming.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 */ |
| 86 | extern Kex *xxx_kex; |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 87 | extern Authctxt *the_authctxt; |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 88 | extern int use_privsep; |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 89 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 90 | static Buffer stdin_buffer; /* Buffer for stdin data. */ |
| 91 | static Buffer stdout_buffer; /* Buffer for stdout data. */ |
| 92 | static Buffer stderr_buffer; /* Buffer for stderr data. */ |
| 93 | static int fdin; /* Descriptor for stdin (for writing) */ |
| 94 | static int fdout; /* Descriptor for stdout (for reading); |
| 95 | May be same number as fdin. */ |
| 96 | static int fderr; /* Descriptor for stderr. May be -1. */ |
| 97 | static long stdin_bytes = 0; /* Number of bytes written to stdin. */ |
| 98 | static long stdout_bytes = 0; /* Number of stdout bytes sent to client. */ |
| 99 | static long stderr_bytes = 0; /* Number of stderr bytes sent to client. */ |
| 100 | static long fdout_bytes = 0; /* Number of stdout bytes read from program. */ |
| 101 | static int stdin_eof = 0; /* EOF message received from client. */ |
| 102 | static int fdout_eof = 0; /* EOF encountered reading from fdout. */ |
| 103 | static int fderr_eof = 0; /* EOF encountered readung from fderr. */ |
Damien Miller | 225736c | 2001-02-19 21:51:08 +1100 | [diff] [blame] | 104 | static int fdin_is_tty = 0; /* fdin points to a tty. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 105 | static int connection_in; /* Connection to client (input). */ |
| 106 | static int connection_out; /* Connection to client (output). */ |
Ben Lindstrom | e34ab4c | 2001-04-07 01:12:11 +0000 | [diff] [blame] | 107 | static int connection_closed = 0; /* Connection to client closed. */ |
| 108 | static u_int buffer_high; /* "Soft" max buffer size. */ |
Darren Tucker | 8901fa9 | 2008-06-11 09:34:01 +1000 | [diff] [blame] | 109 | static int no_more_sessions = 0; /* Disallow further sessions. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 110 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 111 | /* |
| 112 | * This SIGCHLD kludge is used to detect when the child exits. The server |
| 113 | * will exit after that, as soon as forwarded connections have terminated. |
| 114 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 115 | |
Ben Lindstrom | 5e71c54 | 2001-12-06 16:48:14 +0000 | [diff] [blame] | 116 | static volatile sig_atomic_t child_terminated = 0; /* The child has terminated. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 117 | |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 118 | /* Cleanup on signals (!use_privsep case only) */ |
| 119 | static volatile sig_atomic_t received_sigterm = 0; |
| 120 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 121 | /* prototypes */ |
| 122 | static void server_init_dispatch(void); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 123 | |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 124 | /* |
| 125 | * we write to this pipe if a SIGCHLD is caught in order to avoid |
| 126 | * the race between select() and child_terminated |
| 127 | */ |
| 128 | static int notify_pipe[2]; |
| 129 | static void |
| 130 | notify_setup(void) |
| 131 | { |
| 132 | if (pipe(notify_pipe) < 0) { |
| 133 | error("pipe(notify_pipe) failed %s", strerror(errno)); |
Damien Miller | 814ace0 | 2011-05-20 19:02:47 +1000 | [diff] [blame] | 134 | } else if ((fcntl(notify_pipe[0], F_SETFD, FD_CLOEXEC) == -1) || |
| 135 | (fcntl(notify_pipe[1], F_SETFD, FD_CLOEXEC) == -1)) { |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 136 | error("fcntl(notify_pipe, F_SETFD) failed %s", strerror(errno)); |
| 137 | close(notify_pipe[0]); |
| 138 | close(notify_pipe[1]); |
| 139 | } else { |
| 140 | set_nonblock(notify_pipe[0]); |
| 141 | set_nonblock(notify_pipe[1]); |
| 142 | return; |
| 143 | } |
| 144 | notify_pipe[0] = -1; /* read end */ |
| 145 | notify_pipe[1] = -1; /* write end */ |
| 146 | } |
| 147 | static void |
| 148 | notify_parent(void) |
| 149 | { |
| 150 | if (notify_pipe[1] != -1) |
Darren Tucker | dbee308 | 2013-05-16 20:32:29 +1000 | [diff] [blame] | 151 | (void)write(notify_pipe[1], "", 1); |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 152 | } |
| 153 | static void |
| 154 | notify_prepare(fd_set *readset) |
| 155 | { |
| 156 | if (notify_pipe[0] != -1) |
| 157 | FD_SET(notify_pipe[0], readset); |
| 158 | } |
| 159 | static void |
| 160 | notify_done(fd_set *readset) |
| 161 | { |
| 162 | char c; |
| 163 | |
| 164 | if (notify_pipe[0] != -1 && FD_ISSET(notify_pipe[0], readset)) |
| 165 | while (read(notify_pipe[0], &c, 1) != -1) |
| 166 | debug2("notify_done: reading"); |
| 167 | } |
| 168 | |
Damien Miller | f0b15df | 2006-03-26 13:59:20 +1100 | [diff] [blame] | 169 | /*ARGSUSED*/ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 170 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 171 | sigchld_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 172 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 173 | int save_errno = errno; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 174 | child_terminated = 1; |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 175 | #ifndef _UNICOS |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 176 | mysignal(SIGCHLD, sigchld_handler); |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 177 | #endif |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 178 | notify_parent(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 179 | errno = save_errno; |
| 180 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 181 | |
Damien Miller | f0b15df | 2006-03-26 13:59:20 +1100 | [diff] [blame] | 182 | /*ARGSUSED*/ |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 183 | static void |
| 184 | sigterm_handler(int sig) |
| 185 | { |
| 186 | received_sigterm = sig; |
| 187 | } |
| 188 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 189 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 190 | * Make packets from buffered stderr data, and buffer it for sending |
| 191 | * to the client. |
| 192 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 193 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 194 | make_packets_from_stderr_data(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 195 | { |
Darren Tucker | 502d384 | 2003-06-28 12:38:01 +1000 | [diff] [blame] | 196 | u_int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 197 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 198 | /* Send buffered stderr data to the client. */ |
| 199 | while (buffer_len(&stderr_buffer) > 0 && |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 200 | packet_not_very_much_data_to_write()) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 201 | len = buffer_len(&stderr_buffer); |
| 202 | if (packet_is_interactive()) { |
| 203 | if (len > 512) |
| 204 | len = 512; |
| 205 | } else { |
| 206 | /* Keep the packets at reasonable size. */ |
| 207 | if (len > packet_get_maxsize()) |
| 208 | len = packet_get_maxsize(); |
| 209 | } |
| 210 | packet_start(SSH_SMSG_STDERR_DATA); |
| 211 | packet_put_string(buffer_ptr(&stderr_buffer), len); |
| 212 | packet_send(); |
| 213 | buffer_consume(&stderr_buffer, len); |
| 214 | stderr_bytes += len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 215 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 216 | } |
| 217 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 218 | /* |
| 219 | * Make packets from buffered stdout data, and buffer it for sending to the |
| 220 | * client. |
| 221 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 222 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 223 | make_packets_from_stdout_data(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 224 | { |
Darren Tucker | 502d384 | 2003-06-28 12:38:01 +1000 | [diff] [blame] | 225 | u_int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 226 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 227 | /* Send buffered stdout data to the client. */ |
| 228 | while (buffer_len(&stdout_buffer) > 0 && |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 229 | packet_not_very_much_data_to_write()) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 230 | len = buffer_len(&stdout_buffer); |
| 231 | if (packet_is_interactive()) { |
| 232 | if (len > 512) |
| 233 | len = 512; |
| 234 | } else { |
| 235 | /* Keep the packets at reasonable size. */ |
| 236 | if (len > packet_get_maxsize()) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 237 | len = packet_get_maxsize(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 238 | } |
| 239 | packet_start(SSH_SMSG_STDOUT_DATA); |
| 240 | packet_put_string(buffer_ptr(&stdout_buffer), len); |
| 241 | packet_send(); |
| 242 | buffer_consume(&stdout_buffer, len); |
| 243 | stdout_bytes += len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 244 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 245 | } |
| 246 | |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 247 | static void |
| 248 | client_alive_check(void) |
| 249 | { |
Damien Miller | b5820f4 | 2003-12-17 16:27:32 +1100 | [diff] [blame] | 250 | int channel_id; |
Damien Miller | 056cf73 | 2002-01-22 23:21:39 +1100 | [diff] [blame] | 251 | |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 252 | /* timeout, check to see how many we have had */ |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 253 | if (packet_inc_alive_timeouts() > options.client_alive_count_max) { |
Damien Miller | 985a448 | 2006-10-24 03:02:41 +1000 | [diff] [blame] | 254 | logit("Timeout, client not responding."); |
| 255 | cleanup_exit(255); |
| 256 | } |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 257 | |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 258 | /* |
Damien Miller | b5820f4 | 2003-12-17 16:27:32 +1100 | [diff] [blame] | 259 | * send a bogus global/channel request with "wantreply", |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 260 | * we should get back a failure |
| 261 | */ |
Damien Miller | b5820f4 | 2003-12-17 16:27:32 +1100 | [diff] [blame] | 262 | if ((channel_id = channel_find_open()) == -1) { |
| 263 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 264 | packet_put_cstring("keepalive@openssh.com"); |
| 265 | packet_put_char(1); /* boolean: want reply */ |
| 266 | } else { |
| 267 | channel_request_start(channel_id, "keepalive@openssh.com", 1); |
| 268 | } |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 269 | packet_send(); |
| 270 | } |
| 271 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 272 | /* |
| 273 | * Sleep in select() until we can do something. This will initialize the |
| 274 | * select masks. Upon return, the masks will indicate which descriptors |
| 275 | * have data or can accept data. Optionally, a maximum time can be specified |
| 276 | * for the duration of the wait (0 = infinite). |
| 277 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 278 | static void |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 279 | wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
Darren Tucker | 5f96f3b | 2013-05-16 20:29:28 +1000 | [diff] [blame] | 280 | u_int *nallocp, u_int64_t max_time_milliseconds) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 281 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 282 | struct timeval tv, *tvp; |
| 283 | int ret; |
Damien Miller | 6c6da33 | 2012-06-20 22:31:26 +1000 | [diff] [blame] | 284 | time_t minwait_secs = 0; |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 285 | int client_alive_scheduled = 0; |
Damien Miller | e42bd24 | 2007-01-29 10:16:28 +1100 | [diff] [blame] | 286 | int program_alive_scheduled = 0; |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 287 | |
Damien Miller | a650875 | 2012-04-22 11:21:10 +1000 | [diff] [blame] | 288 | /* Allocate and update select() masks for channel descriptors. */ |
| 289 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, |
| 290 | &minwait_secs, 0); |
| 291 | |
| 292 | if (minwait_secs != 0) |
| 293 | max_time_milliseconds = MIN(max_time_milliseconds, |
| 294 | (u_int)minwait_secs * 1000); |
| 295 | |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 296 | /* |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 297 | * if using client_alive, set the max timeout accordingly, |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 298 | * and indicate that this particular timeout was for client |
| 299 | * alive by setting the client_alive_scheduled flag. |
| 300 | * |
| 301 | * this could be randomized somewhat to make traffic |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 302 | * analysis more difficult, but we're not doing it yet. |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 303 | */ |
Ben Lindstrom | 36857f6 | 2001-07-18 15:48:57 +0000 | [diff] [blame] | 304 | if (compat20 && |
| 305 | max_time_milliseconds == 0 && options.client_alive_interval) { |
Ben Lindstrom | 2f0304c | 2001-04-29 19:49:14 +0000 | [diff] [blame] | 306 | client_alive_scheduled = 1; |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 307 | max_time_milliseconds = options.client_alive_interval * 1000; |
Ben Lindstrom | 36857f6 | 2001-07-18 15:48:57 +0000 | [diff] [blame] | 308 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 309 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 310 | if (compat20) { |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 311 | #if 0 |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 312 | /* wrong: bad condition XXX */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 313 | if (channel_not_very_much_buffered_data()) |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 314 | #endif |
| 315 | FD_SET(connection_in, *readsetp); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 316 | } else { |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 317 | /* |
| 318 | * Read packets from the client unless we have too much |
| 319 | * buffered stdin or channel data. |
| 320 | */ |
| 321 | if (buffer_len(&stdin_buffer) < buffer_high && |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 322 | channel_not_very_much_buffered_data()) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 323 | FD_SET(connection_in, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 324 | /* |
| 325 | * If there is not too much data already buffered going to |
| 326 | * the client, try to get some more data from the program. |
| 327 | */ |
| 328 | if (packet_not_very_much_data_to_write()) { |
Damien Miller | e42bd24 | 2007-01-29 10:16:28 +1100 | [diff] [blame] | 329 | program_alive_scheduled = child_terminated; |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 330 | if (!fdout_eof) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 331 | FD_SET(fdout, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 332 | if (!fderr_eof) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 333 | FD_SET(fderr, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 334 | } |
| 335 | /* |
| 336 | * If we have buffered data, try to write some of that data |
| 337 | * to the program. |
| 338 | */ |
| 339 | if (fdin != -1 && buffer_len(&stdin_buffer) > 0) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 340 | FD_SET(fdin, *writesetp); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 341 | } |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 342 | notify_prepare(*readsetp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 343 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 344 | /* |
| 345 | * If we have buffered packet data going to the client, mark that |
| 346 | * descriptor. |
| 347 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 348 | if (packet_have_data_to_write()) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 349 | FD_SET(connection_out, *writesetp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 350 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 351 | /* |
| 352 | * If child has terminated and there is enough buffer space to read |
| 353 | * from it, then read as much as is available and exit. |
| 354 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 355 | if (child_terminated && packet_not_very_much_data_to_write()) |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 356 | if (max_time_milliseconds == 0 || client_alive_scheduled) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 357 | max_time_milliseconds = 100; |
| 358 | |
| 359 | if (max_time_milliseconds == 0) |
| 360 | tvp = NULL; |
| 361 | else { |
| 362 | tv.tv_sec = max_time_milliseconds / 1000; |
| 363 | tv.tv_usec = 1000 * (max_time_milliseconds % 1000); |
| 364 | tvp = &tv; |
| 365 | } |
| 366 | |
| 367 | /* Wait for something to happen, or the timeout to expire. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 368 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 369 | |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 370 | if (ret == -1) { |
Damien Miller | 79faeff | 2001-11-12 11:06:32 +1100 | [diff] [blame] | 371 | memset(*readsetp, 0, *nallocp); |
| 372 | memset(*writesetp, 0, *nallocp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 373 | if (errno != EINTR) |
| 374 | error("select: %.100s", strerror(errno)); |
Damien Miller | e42bd24 | 2007-01-29 10:16:28 +1100 | [diff] [blame] | 375 | } else { |
| 376 | if (ret == 0 && client_alive_scheduled) |
| 377 | client_alive_check(); |
| 378 | if (!compat20 && program_alive_scheduled && fdin_is_tty) { |
| 379 | if (!fdout_eof) |
| 380 | FD_SET(fdout, *readsetp); |
| 381 | if (!fderr_eof) |
| 382 | FD_SET(fderr, *readsetp); |
| 383 | } |
| 384 | } |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 385 | |
| 386 | notify_done(*readsetp); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 387 | } |
| 388 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 389 | /* |
| 390 | * Processes input from the client and the program. Input data is stored |
| 391 | * in buffers and processed later. |
| 392 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 393 | static void |
Damien Miller | 90fdfaf | 2006-03-26 14:25:37 +1100 | [diff] [blame] | 394 | process_input(fd_set *readset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 395 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 396 | int len; |
| 397 | char buf[16384]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 398 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 399 | /* Read and buffer any input data from the client. */ |
| 400 | if (FD_ISSET(connection_in, readset)) { |
Darren Tucker | c5564e1 | 2009-06-21 18:53:53 +1000 | [diff] [blame] | 401 | int cont = 0; |
| 402 | len = roaming_read(connection_in, buf, sizeof(buf), &cont); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 403 | if (len == 0) { |
Darren Tucker | c5564e1 | 2009-06-21 18:53:53 +1000 | [diff] [blame] | 404 | if (cont) |
| 405 | return; |
Damien Miller | 16aed05 | 2002-09-22 01:26:27 +1000 | [diff] [blame] | 406 | verbose("Connection closed by %.100s", |
| 407 | get_remote_ipaddr()); |
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 " |
| 416 | "%.100s: %.100s", |
| 417 | get_remote_ipaddr(), strerror(errno)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 418 | cleanup_exit(255); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 419 | } |
| 420 | } else { |
| 421 | /* Buffer any received data. */ |
| 422 | packet_process_incoming(buf, len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 423 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 424 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 425 | if (compat20) |
| 426 | return; |
| 427 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 428 | /* Read and buffer any available stdout data from the program. */ |
| 429 | if (!fdout_eof && FD_ISSET(fdout, readset)) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 430 | errno = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 431 | len = read(fdout, buf, sizeof(buf)); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 432 | if (len < 0 && (errno == EINTR || ((errno == EAGAIN || |
| 433 | errno == EWOULDBLOCK) && !child_terminated))) { |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 434 | /* do nothing */ |
Darren Tucker | 03890e4 | 2006-06-24 16:58:45 +1000 | [diff] [blame] | 435 | #ifndef PTY_ZEROREAD |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 436 | } else if (len <= 0) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 437 | #else |
Darren Tucker | 144e8d6 | 2006-06-25 08:25:25 +1000 | [diff] [blame] | 438 | } else if ((!isatty(fdout) && len <= 0) || |
| 439 | (isatty(fdout) && (len < 0 || (len == 0 && errno != 0)))) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 440 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 441 | fdout_eof = 1; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 442 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 443 | buffer_append(&stdout_buffer, buf, len); |
| 444 | fdout_bytes += len; |
| 445 | } |
| 446 | } |
| 447 | /* Read and buffer any available stderr data from the program. */ |
| 448 | if (!fderr_eof && FD_ISSET(fderr, readset)) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 449 | errno = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 450 | len = read(fderr, buf, sizeof(buf)); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 451 | if (len < 0 && (errno == EINTR || ((errno == EAGAIN || |
| 452 | errno == EWOULDBLOCK) && !child_terminated))) { |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 453 | /* do nothing */ |
Darren Tucker | 03890e4 | 2006-06-24 16:58:45 +1000 | [diff] [blame] | 454 | #ifndef PTY_ZEROREAD |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 455 | } else if (len <= 0) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 456 | #else |
Darren Tucker | 144e8d6 | 2006-06-25 08:25:25 +1000 | [diff] [blame] | 457 | } else if ((!isatty(fderr) && len <= 0) || |
| 458 | (isatty(fderr) && (len < 0 || (len == 0 && errno != 0)))) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 459 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 460 | fderr_eof = 1; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 461 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 462 | buffer_append(&stderr_buffer, buf, len); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 463 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 464 | } |
| 465 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 466 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 467 | /* |
| 468 | * Sends data from internal buffers to client program stdin. |
| 469 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 470 | static void |
Damien Miller | 90fdfaf | 2006-03-26 14:25:37 +1100 | [diff] [blame] | 471 | process_output(fd_set *writeset) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 472 | { |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 473 | struct termios tio; |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 474 | u_char *data; |
| 475 | u_int dlen; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 476 | int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 477 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 478 | /* Write buffered data to program stdin. */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 479 | if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) { |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 480 | data = buffer_ptr(&stdin_buffer); |
| 481 | dlen = buffer_len(&stdin_buffer); |
| 482 | len = write(fdin, data, dlen); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 483 | if (len < 0 && |
| 484 | (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) { |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 485 | /* do nothing */ |
| 486 | } else if (len <= 0) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 487 | if (fdin != fdout) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 488 | close(fdin); |
| 489 | else |
| 490 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 491 | fdin = -1; |
| 492 | } else { |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 493 | /* Successful write. */ |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 494 | if (fdin_is_tty && dlen >= 1 && data[0] != '\r' && |
| 495 | tcgetattr(fdin, &tio) == 0 && |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 496 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { |
Kevin Steves | b7f036f | 2001-02-15 17:27:15 +0000 | [diff] [blame] | 497 | /* |
| 498 | * Simulate echo to reduce the impact of |
| 499 | * traffic analysis |
| 500 | */ |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 501 | packet_send_ignore(len); |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 502 | packet_send(); |
| 503 | } |
| 504 | /* Consume the data from the buffer. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 505 | buffer_consume(&stdin_buffer, len); |
| 506 | /* Update the count of bytes written to the program. */ |
| 507 | stdin_bytes += len; |
| 508 | } |
| 509 | } |
| 510 | /* Send any buffered packet data to the client. */ |
| 511 | if (FD_ISSET(connection_out, writeset)) |
| 512 | packet_write_poll(); |
| 513 | } |
| 514 | |
| 515 | /* |
| 516 | * Wait until all buffered output has been sent to the client. |
| 517 | * This is used when the program terminates. |
| 518 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 519 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 520 | drain_output(void) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 521 | { |
| 522 | /* Send any buffered stdout data to the client. */ |
| 523 | if (buffer_len(&stdout_buffer) > 0) { |
| 524 | packet_start(SSH_SMSG_STDOUT_DATA); |
| 525 | packet_put_string(buffer_ptr(&stdout_buffer), |
| 526 | buffer_len(&stdout_buffer)); |
| 527 | packet_send(); |
| 528 | /* Update the count of sent bytes. */ |
| 529 | stdout_bytes += buffer_len(&stdout_buffer); |
| 530 | } |
| 531 | /* Send any buffered stderr data to the client. */ |
| 532 | if (buffer_len(&stderr_buffer) > 0) { |
| 533 | packet_start(SSH_SMSG_STDERR_DATA); |
| 534 | packet_put_string(buffer_ptr(&stderr_buffer), |
| 535 | buffer_len(&stderr_buffer)); |
| 536 | packet_send(); |
| 537 | /* Update the count of sent bytes. */ |
| 538 | stderr_bytes += buffer_len(&stderr_buffer); |
| 539 | } |
| 540 | /* Wait until all buffered data has been written to the client. */ |
| 541 | packet_write_wait(); |
| 542 | } |
| 543 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 544 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 545 | process_buffered_input_packets(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 546 | { |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 547 | dispatch_run(DISPATCH_NONBLOCK, NULL, compat20 ? xxx_kex : NULL); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 548 | } |
| 549 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 550 | /* |
| 551 | * Performs the interactive session. This handles data transmission between |
| 552 | * the client and the program. Note that the notion of stdin, stdout, and |
| 553 | * stderr in this function is sort of reversed: this function writes to |
| 554 | * stdin (of the child program), and reads from stdout and stderr (of the |
| 555 | * child program). |
| 556 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 557 | void |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 558 | 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] | 559 | { |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 560 | fd_set *readset = NULL, *writeset = NULL; |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 561 | int max_fd = 0; |
| 562 | u_int nalloc = 0; |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 563 | int wait_status; /* Status returned by wait(). */ |
| 564 | pid_t wait_pid; /* pid returned by wait(). */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 565 | int waiting_termination = 0; /* Have displayed waiting close message. */ |
Darren Tucker | 5f96f3b | 2013-05-16 20:29:28 +1000 | [diff] [blame] | 566 | u_int64_t max_time_milliseconds; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 567 | u_int previous_stdout_buffer_bytes; |
| 568 | u_int stdout_buffer_bytes; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 569 | int type; |
| 570 | |
| 571 | debug("Entering interactive session."); |
| 572 | |
| 573 | /* Initialize the SIGCHLD kludge. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 574 | child_terminated = 0; |
Kevin Steves | e26a155 | 2001-07-26 17:51:49 +0000 | [diff] [blame] | 575 | mysignal(SIGCHLD, sigchld_handler); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 576 | |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 577 | if (!use_privsep) { |
| 578 | signal(SIGTERM, sigterm_handler); |
| 579 | signal(SIGINT, sigterm_handler); |
| 580 | signal(SIGQUIT, sigterm_handler); |
| 581 | } |
| 582 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 583 | /* Initialize our global variables. */ |
| 584 | fdin = fdin_arg; |
| 585 | fdout = fdout_arg; |
| 586 | fderr = fderr_arg; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 587 | |
| 588 | /* nonblocking IO */ |
| 589 | set_nonblock(fdin); |
| 590 | set_nonblock(fdout); |
Damien Miller | 7d6656c | 2000-05-20 15:22:36 +1000 | [diff] [blame] | 591 | /* we don't have stderr for interactive terminal sessions, see below */ |
| 592 | if (fderr != -1) |
| 593 | set_nonblock(fderr); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 594 | |
Damien Miller | 225736c | 2001-02-19 21:51:08 +1100 | [diff] [blame] | 595 | if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin)) |
| 596 | fdin_is_tty = 1; |
| 597 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 598 | connection_in = packet_get_connection_in(); |
| 599 | connection_out = packet_get_connection_out(); |
| 600 | |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 601 | notify_setup(); |
| 602 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 603 | previous_stdout_buffer_bytes = 0; |
| 604 | |
| 605 | /* Set approximate I/O buffer size. */ |
| 606 | if (packet_is_interactive()) |
| 607 | buffer_high = 4096; |
| 608 | else |
| 609 | buffer_high = 64 * 1024; |
| 610 | |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 611 | #if 0 |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 612 | /* Initialize max_fd to the maximum of the known file descriptors. */ |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 613 | max_fd = MAX(connection_in, connection_out); |
| 614 | max_fd = MAX(max_fd, fdin); |
| 615 | max_fd = MAX(max_fd, fdout); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 616 | if (fderr != -1) |
| 617 | max_fd = MAX(max_fd, fderr); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 618 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 619 | |
| 620 | /* Initialize Initialize buffers. */ |
| 621 | buffer_init(&stdin_buffer); |
| 622 | buffer_init(&stdout_buffer); |
| 623 | buffer_init(&stderr_buffer); |
| 624 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 625 | /* |
| 626 | * If we have no separate fderr (which is the case when we have a pty |
| 627 | * - there we cannot make difference between data sent to stdout and |
| 628 | * stderr), indicate that we have seen an EOF from stderr. This way |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 629 | * we don't need to check the descriptor everywhere. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 630 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 631 | if (fderr == -1) |
| 632 | fderr_eof = 1; |
| 633 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 634 | server_init_dispatch(); |
| 635 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 636 | /* Main loop of the server for the interactive session mode. */ |
| 637 | for (;;) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 638 | |
| 639 | /* Process buffered packets from the client. */ |
| 640 | process_buffered_input_packets(); |
| 641 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 642 | /* |
| 643 | * If we have received eof, and there is no more pending |
| 644 | * input data, cause a real eof by closing fdin. |
| 645 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 646 | if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 647 | if (fdin != fdout) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 648 | close(fdin); |
| 649 | else |
| 650 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 651 | fdin = -1; |
| 652 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 653 | /* Make packets from buffered stderr data to send to the client. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 654 | make_packets_from_stderr_data(); |
| 655 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 656 | /* |
| 657 | * Make packets from buffered stdout data to send to the |
| 658 | * client. If there is very little to send, this arranges to |
| 659 | * not send them now, but to wait a short while to see if we |
| 660 | * are getting more data. This is necessary, as some systems |
| 661 | * wake up readers from a pty after each separate character. |
| 662 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 663 | max_time_milliseconds = 0; |
| 664 | stdout_buffer_bytes = buffer_len(&stdout_buffer); |
| 665 | if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 && |
| 666 | stdout_buffer_bytes != previous_stdout_buffer_bytes) { |
| 667 | /* try again after a while */ |
| 668 | max_time_milliseconds = 10; |
| 669 | } else { |
| 670 | /* Send it now. */ |
| 671 | make_packets_from_stdout_data(); |
| 672 | } |
| 673 | previous_stdout_buffer_bytes = buffer_len(&stdout_buffer); |
| 674 | |
| 675 | /* Send channel data to the client. */ |
| 676 | if (packet_not_very_much_data_to_write()) |
| 677 | channel_output_poll(); |
| 678 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 679 | /* |
| 680 | * Bail out of the loop if the program has closed its output |
| 681 | * descriptors, and we have no more data to send to the |
| 682 | * client, and there is no pending buffered data. |
| 683 | */ |
Damien Miller | 43dc8da | 2000-11-29 15:55:17 +1100 | [diff] [blame] | 684 | if (fdout_eof && fderr_eof && !packet_have_data_to_write() && |
| 685 | buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 686 | if (!channel_still_open()) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 687 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 688 | if (!waiting_termination) { |
| 689 | const char *s = "Waiting for forwarded connections to terminate...\r\n"; |
| 690 | char *cp; |
| 691 | waiting_termination = 1; |
| 692 | buffer_append(&stderr_buffer, s, strlen(s)); |
| 693 | |
| 694 | /* Display list of open channels. */ |
| 695 | cp = channel_open_message(); |
| 696 | buffer_append(&stderr_buffer, cp, strlen(cp)); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 697 | free(cp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 698 | } |
| 699 | } |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 700 | max_fd = MAX(connection_in, connection_out); |
| 701 | max_fd = MAX(max_fd, fdin); |
| 702 | max_fd = MAX(max_fd, fdout); |
| 703 | max_fd = MAX(max_fd, fderr); |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 704 | max_fd = MAX(max_fd, notify_pipe[0]); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 705 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 706 | /* Sleep in select() until we can do something. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 707 | wait_until_can_do_something(&readset, &writeset, &max_fd, |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 708 | &nalloc, max_time_milliseconds); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 709 | |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 710 | if (received_sigterm) { |
Darren Tucker | 3e1027c | 2012-12-07 13:07:46 +1100 | [diff] [blame] | 711 | logit("Exiting on signal %d", (int)received_sigterm); |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 712 | /* Clean up sessions, utmp, etc. */ |
| 713 | cleanup_exit(255); |
| 714 | } |
| 715 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 716 | /* Process any channel events. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 717 | channel_after_select(readset, writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 718 | |
| 719 | /* Process input from the client and from program stdout/stderr. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 720 | process_input(readset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 721 | |
| 722 | /* Process output to the client and to program stdin. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 723 | process_output(writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 724 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 725 | free(readset); |
| 726 | free(writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 727 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 728 | /* Cleanup and termination code. */ |
| 729 | |
| 730 | /* Wait until all output has been sent to the client. */ |
| 731 | drain_output(); |
| 732 | |
| 733 | 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] | 734 | stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 735 | |
| 736 | /* Free and clear the buffers. */ |
| 737 | buffer_free(&stdin_buffer); |
| 738 | buffer_free(&stdout_buffer); |
| 739 | buffer_free(&stderr_buffer); |
| 740 | |
| 741 | /* Close the file descriptors. */ |
| 742 | if (fdout != -1) |
| 743 | close(fdout); |
| 744 | fdout = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 745 | fdout_eof = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 746 | if (fderr != -1) |
| 747 | close(fderr); |
| 748 | fderr = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 749 | fderr_eof = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 750 | if (fdin != -1) |
| 751 | close(fdin); |
| 752 | fdin = -1; |
| 753 | |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 754 | channel_free_all(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 755 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 756 | /* We no longer want our SIGCHLD handler to be called. */ |
Kevin Steves | e26a155 | 2001-07-26 17:51:49 +0000 | [diff] [blame] | 757 | mysignal(SIGCHLD, SIG_DFL); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 758 | |
Ben Lindstrom | 47fd811 | 2002-04-02 20:48:19 +0000 | [diff] [blame] | 759 | while ((wait_pid = waitpid(-1, &wait_status, 0)) < 0) |
| 760 | if (errno != EINTR) |
| 761 | packet_disconnect("wait: %.100s", strerror(errno)); |
| 762 | if (wait_pid != pid) |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 763 | error("Strange, wait returned pid %ld, expected %ld", |
| 764 | (long)wait_pid, (long)pid); |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 765 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 766 | /* Check if it exited normally. */ |
| 767 | if (WIFEXITED(wait_status)) { |
| 768 | /* Yes, normal exit. Get exit status and send it to the client. */ |
| 769 | debug("Command exited with status %d.", WEXITSTATUS(wait_status)); |
| 770 | packet_start(SSH_SMSG_EXITSTATUS); |
| 771 | packet_put_int(WEXITSTATUS(wait_status)); |
| 772 | packet_send(); |
| 773 | packet_write_wait(); |
| 774 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 775 | /* |
| 776 | * Wait for exit confirmation. Note that there might be |
| 777 | * other packets coming before it; however, the program has |
| 778 | * already died so we just ignore them. The client is |
| 779 | * supposed to respond with the confirmation when it receives |
| 780 | * the exit status. |
| 781 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 782 | do { |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 783 | type = packet_read(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 784 | } |
| 785 | while (type != SSH_CMSG_EXIT_CONFIRMATION); |
| 786 | |
| 787 | debug("Received exit confirmation."); |
| 788 | return; |
| 789 | } |
| 790 | /* Check if the program terminated due to a signal. */ |
| 791 | if (WIFSIGNALED(wait_status)) |
| 792 | packet_disconnect("Command terminated on signal %d.", |
| 793 | WTERMSIG(wait_status)); |
| 794 | |
| 795 | /* Some weird exit cause. Just exit. */ |
| 796 | packet_disconnect("wait returned status %04x.", wait_status); |
| 797 | /* NOTREACHED */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 798 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 799 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 800 | static void |
| 801 | collect_children(void) |
| 802 | { |
| 803 | pid_t pid; |
| 804 | sigset_t oset, nset; |
| 805 | int status; |
| 806 | |
| 807 | /* block SIGCHLD while we check for dead children */ |
| 808 | sigemptyset(&nset); |
| 809 | sigaddset(&nset, SIGCHLD); |
| 810 | sigprocmask(SIG_BLOCK, &nset, &oset); |
| 811 | if (child_terminated) { |
Damien Miller | ec04f36 | 2006-03-15 12:01:34 +1100 | [diff] [blame] | 812 | debug("Received SIGCHLD."); |
Ben Lindstrom | 47fd811 | 2002-04-02 20:48:19 +0000 | [diff] [blame] | 813 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || |
| 814 | (pid < 0 && errno == EINTR)) |
| 815 | if (pid > 0) |
| 816 | session_close_by_pid(pid, status); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 817 | child_terminated = 0; |
| 818 | } |
| 819 | sigprocmask(SIG_SETMASK, &oset, NULL); |
| 820 | } |
| 821 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 822 | void |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 823 | server_loop2(Authctxt *authctxt) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 824 | { |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 825 | fd_set *readset = NULL, *writeset = NULL; |
Damien Miller | ce98654 | 2013-07-18 16:12:44 +1000 | [diff] [blame] | 826 | int rekeying = 0, max_fd; |
| 827 | u_int nalloc = 0; |
Darren Tucker | 5f96f3b | 2013-05-16 20:29:28 +1000 | [diff] [blame] | 828 | u_int64_t rekey_timeout_ms = 0; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 829 | |
| 830 | debug("Entering interactive session for SSH2."); |
| 831 | |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 832 | mysignal(SIGCHLD, sigchld_handler); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 833 | child_terminated = 0; |
| 834 | connection_in = packet_get_connection_in(); |
| 835 | connection_out = packet_get_connection_out(); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 836 | |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 837 | if (!use_privsep) { |
| 838 | signal(SIGTERM, sigterm_handler); |
| 839 | signal(SIGINT, sigterm_handler); |
| 840 | signal(SIGQUIT, sigterm_handler); |
| 841 | } |
| 842 | |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 843 | notify_setup(); |
| 844 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 845 | max_fd = MAX(connection_in, connection_out); |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 846 | max_fd = MAX(max_fd, notify_pipe[0]); |
| 847 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 848 | server_init_dispatch(); |
| 849 | |
| 850 | for (;;) { |
| 851 | process_buffered_input_packets(); |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 852 | |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 853 | rekeying = (xxx_kex != NULL && !xxx_kex->done); |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 854 | |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 855 | if (!rekeying && packet_not_very_much_data_to_write()) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 856 | channel_output_poll(); |
Darren Tucker | 5f96f3b | 2013-05-16 20:29:28 +1000 | [diff] [blame] | 857 | if (options.rekey_interval > 0 && compat20 && !rekeying) |
| 858 | rekey_timeout_ms = packet_get_rekey_timeout() * 1000; |
| 859 | else |
| 860 | rekey_timeout_ms = 0; |
| 861 | |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 862 | wait_until_can_do_something(&readset, &writeset, &max_fd, |
Darren Tucker | 5f96f3b | 2013-05-16 20:29:28 +1000 | [diff] [blame] | 863 | &nalloc, rekey_timeout_ms); |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 864 | |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 865 | if (received_sigterm) { |
Darren Tucker | 3e1027c | 2012-12-07 13:07:46 +1100 | [diff] [blame] | 866 | logit("Exiting on signal %d", (int)received_sigterm); |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 867 | /* Clean up sessions, utmp, etc. */ |
| 868 | cleanup_exit(255); |
| 869 | } |
| 870 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 871 | collect_children(); |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 872 | if (!rekeying) { |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 873 | channel_after_select(readset, writeset); |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 874 | if (packet_need_rekeying()) { |
| 875 | debug("need rekeying"); |
| 876 | xxx_kex->done = 0; |
| 877 | kex_send_kexinit(xxx_kex); |
| 878 | } |
| 879 | } |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 880 | process_input(readset); |
Ben Lindstrom | e34ab4c | 2001-04-07 01:12:11 +0000 | [diff] [blame] | 881 | if (connection_closed) |
| 882 | break; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 883 | process_output(writeset); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 884 | } |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 885 | collect_children(); |
| 886 | |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 887 | free(readset); |
| 888 | free(writeset); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 889 | |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 890 | /* free all channels, no more reads and writes */ |
| 891 | channel_free_all(); |
Ben Lindstrom | 4983d5e | 2001-07-04 05:17:40 +0000 | [diff] [blame] | 892 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 893 | /* free remaining sessions, e.g. remove wtmp entries */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 894 | session_destroy_all(NULL); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 895 | } |
| 896 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 897 | static void |
Damien Miller | b5820f4 | 2003-12-17 16:27:32 +1100 | [diff] [blame] | 898 | server_input_keep_alive(int type, u_int32_t seq, void *ctxt) |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 899 | { |
Damien Miller | b5820f4 | 2003-12-17 16:27:32 +1100 | [diff] [blame] | 900 | debug("Got %d/%u for keepalive", type, seq); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 901 | /* |
Ben Lindstrom | 2f0304c | 2001-04-29 19:49:14 +0000 | [diff] [blame] | 902 | * reset timeout, since we got a sane answer from the client. |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 903 | * even if this was generated by something other than |
| 904 | * the bogus CHANNEL_REQUEST we send for keepalives. |
| 905 | */ |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 906 | packet_set_alive_timeouts(0); |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 907 | } |
| 908 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 909 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 910 | server_input_stdin_data(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 911 | { |
| 912 | char *data; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 913 | u_int data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 914 | |
| 915 | /* Stdin data from the client. Append it to the buffer. */ |
| 916 | /* Ignore any data if the client has closed stdin. */ |
| 917 | if (fdin == -1) |
| 918 | return; |
| 919 | data = packet_get_string(&data_len); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 920 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 921 | buffer_append(&stdin_buffer, data, data_len); |
| 922 | memset(data, 0, data_len); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 923 | free(data); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 924 | } |
| 925 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 926 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 927 | server_input_eof(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 928 | { |
| 929 | /* |
| 930 | * Eof from the client. The stdin descriptor to the |
| 931 | * program will be closed when all buffered data has |
| 932 | * drained. |
| 933 | */ |
| 934 | debug("EOF received for stdin."); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 935 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 936 | stdin_eof = 1; |
| 937 | } |
| 938 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 939 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 940 | server_input_window_size(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 941 | { |
Damien Miller | 71a7367 | 2006-03-26 14:04:36 +1100 | [diff] [blame] | 942 | u_int row = packet_get_int(); |
| 943 | u_int col = packet_get_int(); |
| 944 | u_int xpixel = packet_get_int(); |
| 945 | u_int ypixel = packet_get_int(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 946 | |
| 947 | debug("Window change received."); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 948 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 949 | if (fdin != -1) |
| 950 | pty_change_window_size(fdin, row, col, xpixel, ypixel); |
| 951 | } |
| 952 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 953 | static Channel * |
Damien Miller | fb1310e | 2004-01-21 11:02:50 +1100 | [diff] [blame] | 954 | server_request_direct_tcpip(void) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 955 | { |
Damien Miller | aa5b3f8 | 2012-12-03 09:50:54 +1100 | [diff] [blame] | 956 | Channel *c = NULL; |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 957 | char *target, *originator; |
Damien Miller | 3dc71ad | 2009-01-28 16:31:22 +1100 | [diff] [blame] | 958 | u_short target_port, originator_port; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 959 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 960 | target = packet_get_string(NULL); |
| 961 | target_port = packet_get_int(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 962 | originator = packet_get_string(NULL); |
| 963 | originator_port = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 964 | packet_check_eom(); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 965 | |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 966 | debug("server_request_direct_tcpip: originator %s port %d, target %s " |
| 967 | "port %d", originator, originator_port, target, target_port); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 968 | |
Damien Miller | aa5b3f8 | 2012-12-03 09:50:54 +1100 | [diff] [blame] | 969 | /* XXX fine grained permissions */ |
| 970 | if ((options.allow_tcp_forwarding & FORWARD_LOCAL) != 0 && |
| 971 | !no_port_forwarding_flag) { |
| 972 | c = channel_connect_to(target, target_port, |
| 973 | "direct-tcpip", "direct-tcpip"); |
| 974 | } else { |
| 975 | logit("refused local port forward: " |
| 976 | "originator %s port %d, target %s port %d", |
| 977 | originator, originator_port, target, target_port); |
| 978 | } |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 979 | |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 980 | free(originator); |
| 981 | free(target); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 982 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 983 | return c; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 984 | } |
| 985 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 986 | static Channel * |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 987 | server_request_tun(void) |
| 988 | { |
| 989 | Channel *c = NULL; |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 990 | int mode, tun; |
| 991 | int sock; |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 992 | |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 993 | mode = packet_get_int(); |
| 994 | switch (mode) { |
| 995 | case SSH_TUNMODE_POINTOPOINT: |
| 996 | case SSH_TUNMODE_ETHERNET: |
| 997 | break; |
| 998 | default: |
| 999 | packet_send_debug("Unsupported tunnel device mode."); |
| 1000 | return NULL; |
| 1001 | } |
| 1002 | if ((options.permit_tun & mode) == 0) { |
| 1003 | packet_send_debug("Server has rejected tunnel device " |
| 1004 | "forwarding"); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1005 | return NULL; |
| 1006 | } |
| 1007 | |
| 1008 | tun = packet_get_int(); |
Darren Tucker | 0d0e8f0 | 2005-12-20 16:08:42 +1100 | [diff] [blame] | 1009 | if (forced_tun_device != -1) { |
Damien Miller | f0b15df | 2006-03-26 13:59:20 +1100 | [diff] [blame] | 1010 | if (tun != SSH_TUNID_ANY && forced_tun_device != tun) |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1011 | goto done; |
| 1012 | tun = forced_tun_device; |
| 1013 | } |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 1014 | sock = tun_open(tun, mode); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1015 | if (sock < 0) |
| 1016 | goto done; |
| 1017 | c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1, |
| 1018 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); |
| 1019 | c->datagram = 1; |
Damien Miller | 598bbc2 | 2005-12-31 16:33:36 +1100 | [diff] [blame] | 1020 | #if defined(SSH_TUN_FILTER) |
| 1021 | if (mode == SSH_TUNMODE_POINTOPOINT) |
| 1022 | channel_register_filter(c->self, sys_tun_infilter, |
Darren Tucker | 1cf65ae | 2008-06-13 05:09:18 +1000 | [diff] [blame] | 1023 | sys_tun_outfilter, NULL, NULL); |
Damien Miller | 598bbc2 | 2005-12-31 16:33:36 +1100 | [diff] [blame] | 1024 | #endif |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1025 | |
| 1026 | done: |
| 1027 | if (c == NULL) |
| 1028 | packet_send_debug("Failed to open the tunnel device."); |
| 1029 | return c; |
| 1030 | } |
| 1031 | |
| 1032 | static Channel * |
Damien Miller | fb1310e | 2004-01-21 11:02:50 +1100 | [diff] [blame] | 1033 | server_request_session(void) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1034 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1035 | Channel *c; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1036 | |
| 1037 | debug("input_session_request"); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1038 | packet_check_eom(); |
Darren Tucker | 8901fa9 | 2008-06-11 09:34:01 +1000 | [diff] [blame] | 1039 | |
| 1040 | if (no_more_sessions) { |
| 1041 | packet_disconnect("Possible attack: attempt to open a session " |
| 1042 | "after additional sessions disabled"); |
| 1043 | } |
| 1044 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1045 | /* |
| 1046 | * A server session has no fd to read or write until a |
| 1047 | * CHANNEL_REQUEST for a shell is made, so we set the type to |
| 1048 | * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all |
| 1049 | * CHANNEL_REQUEST messages is registered. |
| 1050 | */ |
Damien Miller | fb1310e | 2004-01-21 11:02:50 +1100 | [diff] [blame] | 1051 | c = channel_new("session", SSH_CHANNEL_LARVAL, |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1052 | -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1053 | 0, "server-session", 1); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1054 | if (session_open(the_authctxt, c->self) != 1) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1055 | debug("session open failed, free channel %d", c->self); |
| 1056 | channel_free(c); |
| 1057 | return NULL; |
| 1058 | } |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 1059 | channel_register_cleanup(c->self, session_close_by_channel, 0); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1060 | return c; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1061 | } |
| 1062 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1063 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1064 | server_input_channel_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1065 | { |
| 1066 | Channel *c = NULL; |
| 1067 | char *ctype; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1068 | int rchan; |
Ben Lindstrom | 4fed2be | 2002-06-25 23:17:36 +0000 | [diff] [blame] | 1069 | u_int rmaxpack, rwindow, len; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1070 | |
| 1071 | ctype = packet_get_string(&len); |
| 1072 | rchan = packet_get_int(); |
| 1073 | rwindow = packet_get_int(); |
| 1074 | rmaxpack = packet_get_int(); |
| 1075 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1076 | 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] | 1077 | ctype, rchan, rwindow, rmaxpack); |
| 1078 | |
| 1079 | if (strcmp(ctype, "session") == 0) { |
Damien Miller | fb1310e | 2004-01-21 11:02:50 +1100 | [diff] [blame] | 1080 | c = server_request_session(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1081 | } else if (strcmp(ctype, "direct-tcpip") == 0) { |
Damien Miller | fb1310e | 2004-01-21 11:02:50 +1100 | [diff] [blame] | 1082 | c = server_request_direct_tcpip(); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1083 | } else if (strcmp(ctype, "tun@openssh.com") == 0) { |
| 1084 | c = server_request_tun(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1085 | } |
| 1086 | if (c != NULL) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1087 | debug("server_input_channel_open: confirm %s", ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1088 | c->remote_id = rchan; |
| 1089 | c->remote_window = rwindow; |
| 1090 | c->remote_maxpacket = rmaxpack; |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1091 | if (c->type != SSH_CHANNEL_CONNECTING) { |
| 1092 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1093 | packet_put_int(c->remote_id); |
| 1094 | packet_put_int(c->self); |
| 1095 | packet_put_int(c->local_window); |
| 1096 | packet_put_int(c->local_maxpacket); |
| 1097 | packet_send(); |
| 1098 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1099 | } else { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1100 | debug("server_input_channel_open: failure %s", ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1101 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
| 1102 | packet_put_int(rchan); |
| 1103 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 1104 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1105 | packet_put_cstring("open failed"); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 1106 | packet_put_cstring(""); |
| 1107 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1108 | packet_send(); |
| 1109 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1110 | free(ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1111 | } |
| 1112 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1113 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1114 | server_input_global_request(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1115 | { |
| 1116 | char *rtype; |
| 1117 | int want_reply; |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 1118 | int success = 0, allocated_listen_port = 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1119 | |
| 1120 | rtype = packet_get_string(NULL); |
| 1121 | want_reply = packet_get_char(); |
| 1122 | 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] | 1123 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 1124 | /* -R style forwarding */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1125 | if (strcmp(rtype, "tcpip-forward") == 0) { |
| 1126 | struct passwd *pw; |
| 1127 | char *listen_address; |
| 1128 | u_short listen_port; |
| 1129 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1130 | pw = the_authctxt->pw; |
Damien Miller | 4bb1dd3 | 2003-11-18 22:01:25 +1100 | [diff] [blame] | 1131 | if (pw == NULL || !the_authctxt->valid) |
Damien Miller | 3e3b514 | 2003-11-17 21:13:40 +1100 | [diff] [blame] | 1132 | fatal("server_input_global_request: no/invalid user"); |
Damien Miller | 9fc7c69 | 2003-06-04 22:50:54 +1000 | [diff] [blame] | 1133 | listen_address = packet_get_string(NULL); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1134 | listen_port = (u_short)packet_get_int(); |
| 1135 | debug("server_input_global_request: tcpip-forward listen %s port %d", |
| 1136 | listen_address, listen_port); |
| 1137 | |
| 1138 | /* check permissions */ |
Damien Miller | aa5b3f8 | 2012-12-03 09:50:54 +1100 | [diff] [blame] | 1139 | if ((options.allow_tcp_forwarding & FORWARD_REMOTE) == 0 || |
Damien Miller | 330d585 | 2009-02-14 16:33:09 +1100 | [diff] [blame] | 1140 | no_port_forwarding_flag || |
| 1141 | (!want_reply && listen_port == 0) |
Ben Lindstrom | 99a4e14 | 2002-07-09 14:06:40 +0000 | [diff] [blame] | 1142 | #ifndef NO_IPPORT_RESERVED_CONCEPT |
Damien Miller | e5d5a17 | 2009-09-09 11:07:28 +1000 | [diff] [blame] | 1143 | || (listen_port != 0 && listen_port < IPPORT_RESERVED && |
| 1144 | pw->pw_uid != 0) |
Ben Lindstrom | 99a4e14 | 2002-07-09 14:06:40 +0000 | [diff] [blame] | 1145 | #endif |
Damien Miller | b6f72f5 | 2005-07-17 17:26:43 +1000 | [diff] [blame] | 1146 | ) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1147 | success = 0; |
| 1148 | packet_send_debug("Server has disabled port forwarding."); |
| 1149 | } else { |
| 1150 | /* Start listening on the port */ |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 1151 | success = channel_setup_remote_fwd_listener( |
Damien Miller | 330d585 | 2009-02-14 16:33:09 +1100 | [diff] [blame] | 1152 | listen_address, listen_port, |
| 1153 | &allocated_listen_port, options.gateway_ports); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1154 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1155 | free(listen_address); |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 1156 | } else if (strcmp(rtype, "cancel-tcpip-forward") == 0) { |
| 1157 | char *cancel_address; |
| 1158 | u_short cancel_port; |
| 1159 | |
| 1160 | cancel_address = packet_get_string(NULL); |
| 1161 | cancel_port = (u_short)packet_get_int(); |
| 1162 | debug("%s: cancel-tcpip-forward addr %s port %d", __func__, |
| 1163 | cancel_address, cancel_port); |
| 1164 | |
| 1165 | success = channel_cancel_rport_listener(cancel_address, |
| 1166 | cancel_port); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1167 | free(cancel_address); |
Darren Tucker | 8901fa9 | 2008-06-11 09:34:01 +1000 | [diff] [blame] | 1168 | } else if (strcmp(rtype, "no-more-sessions@openssh.com") == 0) { |
| 1169 | no_more_sessions = 1; |
| 1170 | success = 1; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1171 | } |
| 1172 | if (want_reply) { |
| 1173 | packet_start(success ? |
| 1174 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 1175 | if (success && allocated_listen_port > 0) |
| 1176 | packet_put_int(allocated_listen_port); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1177 | packet_send(); |
| 1178 | packet_write_wait(); |
| 1179 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1180 | free(rtype); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1181 | } |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 1182 | |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1183 | static void |
| 1184 | server_input_channel_req(int type, u_int32_t seq, void *ctxt) |
| 1185 | { |
| 1186 | Channel *c; |
| 1187 | int id, reply, success = 0; |
| 1188 | char *rtype; |
| 1189 | |
| 1190 | id = packet_get_int(); |
| 1191 | rtype = packet_get_string(NULL); |
| 1192 | reply = packet_get_char(); |
| 1193 | |
| 1194 | debug("server_input_channel_req: channel %d request %s reply %d", |
| 1195 | id, rtype, reply); |
| 1196 | |
| 1197 | if ((c = channel_lookup(id)) == NULL) |
| 1198 | packet_disconnect("server_input_channel_req: " |
| 1199 | "unknown channel %d", id); |
Damien Miller | bab9bd4 | 2008-05-19 16:06:47 +1000 | [diff] [blame] | 1200 | if (!strcmp(rtype, "eow@openssh.com")) { |
| 1201 | packet_check_eom(); |
| 1202 | chan_rcvd_eow(c); |
Darren Tucker | 8810dd4 | 2008-07-02 22:32:14 +1000 | [diff] [blame] | 1203 | } else if ((c->type == SSH_CHANNEL_LARVAL || |
| 1204 | c->type == SSH_CHANNEL_OPEN) && strcmp(c->ctype, "session") == 0) |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1205 | success = session_input_channel_req(c, rtype); |
| 1206 | if (reply) { |
| 1207 | packet_start(success ? |
| 1208 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); |
| 1209 | packet_put_int(c->remote_id); |
| 1210 | packet_send(); |
| 1211 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1212 | free(rtype); |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1213 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1214 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1215 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1216 | server_init_dispatch_20(void) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1217 | { |
| 1218 | debug("server_init_dispatch_20"); |
| 1219 | dispatch_init(&dispatch_protocol_error); |
| 1220 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
| 1221 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); |
| 1222 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); |
| 1223 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); |
| 1224 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open); |
| 1225 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 1226 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1227 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &server_input_channel_req); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1228 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1229 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request); |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 1230 | /* client_alive */ |
Damien Miller | 5a33ec6 | 2008-12-08 09:55:02 +1100 | [diff] [blame] | 1231 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &server_input_keep_alive); |
| 1232 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_keep_alive); |
Damien Miller | b5820f4 | 2003-12-17 16:27:32 +1100 | [diff] [blame] | 1233 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &server_input_keep_alive); |
| 1234 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &server_input_keep_alive); |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 1235 | /* rekeying */ |
| 1236 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1237 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1238 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1239 | server_init_dispatch_13(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1240 | { |
| 1241 | debug("server_init_dispatch_13"); |
| 1242 | dispatch_init(NULL); |
| 1243 | dispatch_set(SSH_CMSG_EOF, &server_input_eof); |
| 1244 | dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data); |
| 1245 | dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size); |
| 1246 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); |
| 1247 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); |
| 1248 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); |
| 1249 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 1250 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
| 1251 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); |
| 1252 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1253 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1254 | server_init_dispatch_15(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1255 | { |
| 1256 | server_init_dispatch_13(); |
| 1257 | debug("server_init_dispatch_15"); |
| 1258 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); |
| 1259 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose); |
| 1260 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1261 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1262 | server_init_dispatch(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1263 | { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1264 | if (compat20) |
| 1265 | server_init_dispatch_20(); |
| 1266 | else if (compat13) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1267 | server_init_dispatch_13(); |
| 1268 | else |
| 1269 | server_init_dispatch_15(); |
| 1270 | } |