Darren Tucker | c5564e1 | 2009-06-21 18:53:53 +1000 | [diff] [blame] | 1 | /* $OpenBSD: serverloop.c,v 1.159 2009/05/28 16:50:16 andreas 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)); |
| 134 | } else if ((fcntl(notify_pipe[0], F_SETFD, 1) == -1) || |
| 135 | (fcntl(notify_pipe[1], F_SETFD, 1) == -1)) { |
| 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) |
| 151 | write(notify_pipe[1], "", 1); |
| 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 | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 280 | u_int *nallocp, u_int 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; |
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 | |
| 287 | /* |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 288 | * if using client_alive, set the max timeout accordingly, |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 289 | * and indicate that this particular timeout was for client |
| 290 | * alive by setting the client_alive_scheduled flag. |
| 291 | * |
| 292 | * this could be randomized somewhat to make traffic |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 293 | * analysis more difficult, but we're not doing it yet. |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 294 | */ |
Ben Lindstrom | 36857f6 | 2001-07-18 15:48:57 +0000 | [diff] [blame] | 295 | if (compat20 && |
| 296 | max_time_milliseconds == 0 && options.client_alive_interval) { |
Ben Lindstrom | 2f0304c | 2001-04-29 19:49:14 +0000 | [diff] [blame] | 297 | client_alive_scheduled = 1; |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 298 | max_time_milliseconds = options.client_alive_interval * 1000; |
Ben Lindstrom | 36857f6 | 2001-07-18 15:48:57 +0000 | [diff] [blame] | 299 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 300 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 301 | /* Allocate and update select() masks for channel descriptors. */ |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 302 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, 0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 303 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 304 | if (compat20) { |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 305 | #if 0 |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 306 | /* wrong: bad condition XXX */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 307 | if (channel_not_very_much_buffered_data()) |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 308 | #endif |
| 309 | FD_SET(connection_in, *readsetp); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 310 | } else { |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 311 | /* |
| 312 | * Read packets from the client unless we have too much |
| 313 | * buffered stdin or channel data. |
| 314 | */ |
| 315 | if (buffer_len(&stdin_buffer) < buffer_high && |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 316 | channel_not_very_much_buffered_data()) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 317 | FD_SET(connection_in, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 318 | /* |
| 319 | * If there is not too much data already buffered going to |
| 320 | * the client, try to get some more data from the program. |
| 321 | */ |
| 322 | if (packet_not_very_much_data_to_write()) { |
Damien Miller | e42bd24 | 2007-01-29 10:16:28 +1100 | [diff] [blame] | 323 | program_alive_scheduled = child_terminated; |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 324 | if (!fdout_eof) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 325 | FD_SET(fdout, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 326 | if (!fderr_eof) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 327 | FD_SET(fderr, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 328 | } |
| 329 | /* |
| 330 | * If we have buffered data, try to write some of that data |
| 331 | * to the program. |
| 332 | */ |
| 333 | if (fdin != -1 && buffer_len(&stdin_buffer) > 0) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 334 | FD_SET(fdin, *writesetp); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 335 | } |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 336 | notify_prepare(*readsetp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 337 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 338 | /* |
| 339 | * If we have buffered packet data going to the client, mark that |
| 340 | * descriptor. |
| 341 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 342 | if (packet_have_data_to_write()) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 343 | FD_SET(connection_out, *writesetp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 344 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 345 | /* |
| 346 | * If child has terminated and there is enough buffer space to read |
| 347 | * from it, then read as much as is available and exit. |
| 348 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 349 | if (child_terminated && packet_not_very_much_data_to_write()) |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 350 | if (max_time_milliseconds == 0 || client_alive_scheduled) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 351 | max_time_milliseconds = 100; |
| 352 | |
| 353 | if (max_time_milliseconds == 0) |
| 354 | tvp = NULL; |
| 355 | else { |
| 356 | tv.tv_sec = max_time_milliseconds / 1000; |
| 357 | tv.tv_usec = 1000 * (max_time_milliseconds % 1000); |
| 358 | tvp = &tv; |
| 359 | } |
| 360 | |
| 361 | /* Wait for something to happen, or the timeout to expire. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 362 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 363 | |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 364 | if (ret == -1) { |
Damien Miller | 79faeff | 2001-11-12 11:06:32 +1100 | [diff] [blame] | 365 | memset(*readsetp, 0, *nallocp); |
| 366 | memset(*writesetp, 0, *nallocp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 367 | if (errno != EINTR) |
| 368 | error("select: %.100s", strerror(errno)); |
Damien Miller | e42bd24 | 2007-01-29 10:16:28 +1100 | [diff] [blame] | 369 | } else { |
| 370 | if (ret == 0 && client_alive_scheduled) |
| 371 | client_alive_check(); |
| 372 | if (!compat20 && program_alive_scheduled && fdin_is_tty) { |
| 373 | if (!fdout_eof) |
| 374 | FD_SET(fdout, *readsetp); |
| 375 | if (!fderr_eof) |
| 376 | FD_SET(fderr, *readsetp); |
| 377 | } |
| 378 | } |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 379 | |
| 380 | notify_done(*readsetp); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 381 | } |
| 382 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 383 | /* |
| 384 | * Processes input from the client and the program. Input data is stored |
| 385 | * in buffers and processed later. |
| 386 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 387 | static void |
Damien Miller | 90fdfaf | 2006-03-26 14:25:37 +1100 | [diff] [blame] | 388 | process_input(fd_set *readset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 389 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 390 | int len; |
| 391 | char buf[16384]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 392 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 393 | /* Read and buffer any input data from the client. */ |
| 394 | if (FD_ISSET(connection_in, readset)) { |
Darren Tucker | c5564e1 | 2009-06-21 18:53:53 +1000 | [diff] [blame] | 395 | int cont = 0; |
| 396 | len = roaming_read(connection_in, buf, sizeof(buf), &cont); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 397 | if (len == 0) { |
Darren Tucker | c5564e1 | 2009-06-21 18:53:53 +1000 | [diff] [blame] | 398 | if (cont) |
| 399 | return; |
Damien Miller | 16aed05 | 2002-09-22 01:26:27 +1000 | [diff] [blame] | 400 | verbose("Connection closed by %.100s", |
| 401 | get_remote_ipaddr()); |
Ben Lindstrom | e34ab4c | 2001-04-07 01:12:11 +0000 | [diff] [blame] | 402 | connection_closed = 1; |
| 403 | if (compat20) |
| 404 | return; |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 405 | cleanup_exit(255); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 406 | } else if (len < 0) { |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 407 | if (errno != EINTR && errno != EAGAIN && |
| 408 | errno != EWOULDBLOCK) { |
Damien Miller | 16aed05 | 2002-09-22 01:26:27 +1000 | [diff] [blame] | 409 | verbose("Read error from remote host " |
| 410 | "%.100s: %.100s", |
| 411 | get_remote_ipaddr(), strerror(errno)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 412 | cleanup_exit(255); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 413 | } |
| 414 | } else { |
| 415 | /* Buffer any received data. */ |
| 416 | packet_process_incoming(buf, len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 417 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 418 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 419 | if (compat20) |
| 420 | return; |
| 421 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 422 | /* Read and buffer any available stdout data from the program. */ |
| 423 | if (!fdout_eof && FD_ISSET(fdout, readset)) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 424 | errno = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 425 | len = read(fdout, buf, sizeof(buf)); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 426 | if (len < 0 && (errno == EINTR || ((errno == EAGAIN || |
| 427 | errno == EWOULDBLOCK) && !child_terminated))) { |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 428 | /* do nothing */ |
Darren Tucker | 03890e4 | 2006-06-24 16:58:45 +1000 | [diff] [blame] | 429 | #ifndef PTY_ZEROREAD |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 430 | } else if (len <= 0) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 431 | #else |
Darren Tucker | 144e8d6 | 2006-06-25 08:25:25 +1000 | [diff] [blame] | 432 | } else if ((!isatty(fdout) && len <= 0) || |
| 433 | (isatty(fdout) && (len < 0 || (len == 0 && errno != 0)))) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 434 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 435 | fdout_eof = 1; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 436 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 437 | buffer_append(&stdout_buffer, buf, len); |
| 438 | fdout_bytes += len; |
| 439 | } |
| 440 | } |
| 441 | /* Read and buffer any available stderr data from the program. */ |
| 442 | if (!fderr_eof && FD_ISSET(fderr, readset)) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 443 | errno = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 444 | len = read(fderr, buf, sizeof(buf)); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 445 | if (len < 0 && (errno == EINTR || ((errno == EAGAIN || |
| 446 | errno == EWOULDBLOCK) && !child_terminated))) { |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 447 | /* do nothing */ |
Darren Tucker | 03890e4 | 2006-06-24 16:58:45 +1000 | [diff] [blame] | 448 | #ifndef PTY_ZEROREAD |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 449 | } else if (len <= 0) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 450 | #else |
Darren Tucker | 144e8d6 | 2006-06-25 08:25:25 +1000 | [diff] [blame] | 451 | } else if ((!isatty(fderr) && len <= 0) || |
| 452 | (isatty(fderr) && (len < 0 || (len == 0 && errno != 0)))) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 453 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 454 | fderr_eof = 1; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 455 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 456 | buffer_append(&stderr_buffer, buf, len); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 457 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 458 | } |
| 459 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 460 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 461 | /* |
| 462 | * Sends data from internal buffers to client program stdin. |
| 463 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 464 | static void |
Damien Miller | 90fdfaf | 2006-03-26 14:25:37 +1100 | [diff] [blame] | 465 | process_output(fd_set *writeset) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 466 | { |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 467 | struct termios tio; |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 468 | u_char *data; |
| 469 | u_int dlen; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 470 | int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 471 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 472 | /* Write buffered data to program stdin. */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 473 | if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) { |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 474 | data = buffer_ptr(&stdin_buffer); |
| 475 | dlen = buffer_len(&stdin_buffer); |
| 476 | len = write(fdin, data, dlen); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 477 | if (len < 0 && |
| 478 | (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) { |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 479 | /* do nothing */ |
| 480 | } else if (len <= 0) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 481 | if (fdin != fdout) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 482 | close(fdin); |
| 483 | else |
| 484 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 485 | fdin = -1; |
| 486 | } else { |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 487 | /* Successful write. */ |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 488 | if (fdin_is_tty && dlen >= 1 && data[0] != '\r' && |
| 489 | tcgetattr(fdin, &tio) == 0 && |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 490 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { |
Kevin Steves | b7f036f | 2001-02-15 17:27:15 +0000 | [diff] [blame] | 491 | /* |
| 492 | * Simulate echo to reduce the impact of |
| 493 | * traffic analysis |
| 494 | */ |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 495 | packet_send_ignore(len); |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 496 | packet_send(); |
| 497 | } |
| 498 | /* Consume the data from the buffer. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 499 | buffer_consume(&stdin_buffer, len); |
| 500 | /* Update the count of bytes written to the program. */ |
| 501 | stdin_bytes += len; |
| 502 | } |
| 503 | } |
| 504 | /* Send any buffered packet data to the client. */ |
| 505 | if (FD_ISSET(connection_out, writeset)) |
| 506 | packet_write_poll(); |
| 507 | } |
| 508 | |
| 509 | /* |
| 510 | * Wait until all buffered output has been sent to the client. |
| 511 | * This is used when the program terminates. |
| 512 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 513 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 514 | drain_output(void) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 515 | { |
| 516 | /* Send any buffered stdout data to the client. */ |
| 517 | if (buffer_len(&stdout_buffer) > 0) { |
| 518 | packet_start(SSH_SMSG_STDOUT_DATA); |
| 519 | packet_put_string(buffer_ptr(&stdout_buffer), |
| 520 | buffer_len(&stdout_buffer)); |
| 521 | packet_send(); |
| 522 | /* Update the count of sent bytes. */ |
| 523 | stdout_bytes += buffer_len(&stdout_buffer); |
| 524 | } |
| 525 | /* Send any buffered stderr data to the client. */ |
| 526 | if (buffer_len(&stderr_buffer) > 0) { |
| 527 | packet_start(SSH_SMSG_STDERR_DATA); |
| 528 | packet_put_string(buffer_ptr(&stderr_buffer), |
| 529 | buffer_len(&stderr_buffer)); |
| 530 | packet_send(); |
| 531 | /* Update the count of sent bytes. */ |
| 532 | stderr_bytes += buffer_len(&stderr_buffer); |
| 533 | } |
| 534 | /* Wait until all buffered data has been written to the client. */ |
| 535 | packet_write_wait(); |
| 536 | } |
| 537 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 538 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 539 | process_buffered_input_packets(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 540 | { |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 541 | dispatch_run(DISPATCH_NONBLOCK, NULL, compat20 ? xxx_kex : NULL); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 542 | } |
| 543 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 544 | /* |
| 545 | * Performs the interactive session. This handles data transmission between |
| 546 | * the client and the program. Note that the notion of stdin, stdout, and |
| 547 | * stderr in this function is sort of reversed: this function writes to |
| 548 | * stdin (of the child program), and reads from stdout and stderr (of the |
| 549 | * child program). |
| 550 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 551 | void |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 552 | 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] | 553 | { |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 554 | fd_set *readset = NULL, *writeset = NULL; |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 555 | int max_fd = 0; |
| 556 | u_int nalloc = 0; |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 557 | int wait_status; /* Status returned by wait(). */ |
| 558 | pid_t wait_pid; /* pid returned by wait(). */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 559 | int waiting_termination = 0; /* Have displayed waiting close message. */ |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 560 | u_int max_time_milliseconds; |
| 561 | u_int previous_stdout_buffer_bytes; |
| 562 | u_int stdout_buffer_bytes; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 563 | int type; |
| 564 | |
| 565 | debug("Entering interactive session."); |
| 566 | |
| 567 | /* Initialize the SIGCHLD kludge. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 568 | child_terminated = 0; |
Kevin Steves | e26a155 | 2001-07-26 17:51:49 +0000 | [diff] [blame] | 569 | mysignal(SIGCHLD, sigchld_handler); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 570 | |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 571 | if (!use_privsep) { |
| 572 | signal(SIGTERM, sigterm_handler); |
| 573 | signal(SIGINT, sigterm_handler); |
| 574 | signal(SIGQUIT, sigterm_handler); |
| 575 | } |
| 576 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 577 | /* Initialize our global variables. */ |
| 578 | fdin = fdin_arg; |
| 579 | fdout = fdout_arg; |
| 580 | fderr = fderr_arg; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 581 | |
| 582 | /* nonblocking IO */ |
| 583 | set_nonblock(fdin); |
| 584 | set_nonblock(fdout); |
Damien Miller | 7d6656c | 2000-05-20 15:22:36 +1000 | [diff] [blame] | 585 | /* we don't have stderr for interactive terminal sessions, see below */ |
| 586 | if (fderr != -1) |
| 587 | set_nonblock(fderr); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 588 | |
Damien Miller | 225736c | 2001-02-19 21:51:08 +1100 | [diff] [blame] | 589 | if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin)) |
| 590 | fdin_is_tty = 1; |
| 591 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 592 | connection_in = packet_get_connection_in(); |
| 593 | connection_out = packet_get_connection_out(); |
| 594 | |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 595 | notify_setup(); |
| 596 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 597 | previous_stdout_buffer_bytes = 0; |
| 598 | |
| 599 | /* Set approximate I/O buffer size. */ |
| 600 | if (packet_is_interactive()) |
| 601 | buffer_high = 4096; |
| 602 | else |
| 603 | buffer_high = 64 * 1024; |
| 604 | |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 605 | #if 0 |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 606 | /* Initialize max_fd to the maximum of the known file descriptors. */ |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 607 | max_fd = MAX(connection_in, connection_out); |
| 608 | max_fd = MAX(max_fd, fdin); |
| 609 | max_fd = MAX(max_fd, fdout); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 610 | if (fderr != -1) |
| 611 | max_fd = MAX(max_fd, fderr); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 612 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 613 | |
| 614 | /* Initialize Initialize buffers. */ |
| 615 | buffer_init(&stdin_buffer); |
| 616 | buffer_init(&stdout_buffer); |
| 617 | buffer_init(&stderr_buffer); |
| 618 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 619 | /* |
| 620 | * If we have no separate fderr (which is the case when we have a pty |
| 621 | * - there we cannot make difference between data sent to stdout and |
| 622 | * stderr), indicate that we have seen an EOF from stderr. This way |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 623 | * we don't need to check the descriptor everywhere. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 624 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 625 | if (fderr == -1) |
| 626 | fderr_eof = 1; |
| 627 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 628 | server_init_dispatch(); |
| 629 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 630 | /* Main loop of the server for the interactive session mode. */ |
| 631 | for (;;) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 632 | |
| 633 | /* Process buffered packets from the client. */ |
| 634 | process_buffered_input_packets(); |
| 635 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 636 | /* |
| 637 | * If we have received eof, and there is no more pending |
| 638 | * input data, cause a real eof by closing fdin. |
| 639 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 640 | if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 641 | if (fdin != fdout) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 642 | close(fdin); |
| 643 | else |
| 644 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 645 | fdin = -1; |
| 646 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 647 | /* Make packets from buffered stderr data to send to the client. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 648 | make_packets_from_stderr_data(); |
| 649 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 650 | /* |
| 651 | * Make packets from buffered stdout data to send to the |
| 652 | * client. If there is very little to send, this arranges to |
| 653 | * not send them now, but to wait a short while to see if we |
| 654 | * are getting more data. This is necessary, as some systems |
| 655 | * wake up readers from a pty after each separate character. |
| 656 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 657 | max_time_milliseconds = 0; |
| 658 | stdout_buffer_bytes = buffer_len(&stdout_buffer); |
| 659 | if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 && |
| 660 | stdout_buffer_bytes != previous_stdout_buffer_bytes) { |
| 661 | /* try again after a while */ |
| 662 | max_time_milliseconds = 10; |
| 663 | } else { |
| 664 | /* Send it now. */ |
| 665 | make_packets_from_stdout_data(); |
| 666 | } |
| 667 | previous_stdout_buffer_bytes = buffer_len(&stdout_buffer); |
| 668 | |
| 669 | /* Send channel data to the client. */ |
| 670 | if (packet_not_very_much_data_to_write()) |
| 671 | channel_output_poll(); |
| 672 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 673 | /* |
| 674 | * Bail out of the loop if the program has closed its output |
| 675 | * descriptors, and we have no more data to send to the |
| 676 | * client, and there is no pending buffered data. |
| 677 | */ |
Damien Miller | 43dc8da | 2000-11-29 15:55:17 +1100 | [diff] [blame] | 678 | if (fdout_eof && fderr_eof && !packet_have_data_to_write() && |
| 679 | buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 680 | if (!channel_still_open()) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 681 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 682 | if (!waiting_termination) { |
| 683 | const char *s = "Waiting for forwarded connections to terminate...\r\n"; |
| 684 | char *cp; |
| 685 | waiting_termination = 1; |
| 686 | buffer_append(&stderr_buffer, s, strlen(s)); |
| 687 | |
| 688 | /* Display list of open channels. */ |
| 689 | cp = channel_open_message(); |
| 690 | buffer_append(&stderr_buffer, cp, strlen(cp)); |
| 691 | xfree(cp); |
| 692 | } |
| 693 | } |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 694 | max_fd = MAX(connection_in, connection_out); |
| 695 | max_fd = MAX(max_fd, fdin); |
| 696 | max_fd = MAX(max_fd, fdout); |
| 697 | max_fd = MAX(max_fd, fderr); |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 698 | max_fd = MAX(max_fd, notify_pipe[0]); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 699 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 700 | /* Sleep in select() until we can do something. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 701 | wait_until_can_do_something(&readset, &writeset, &max_fd, |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 702 | &nalloc, max_time_milliseconds); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 703 | |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 704 | if (received_sigterm) { |
| 705 | logit("Exiting on signal %d", received_sigterm); |
| 706 | /* Clean up sessions, utmp, etc. */ |
| 707 | cleanup_exit(255); |
| 708 | } |
| 709 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 710 | /* Process any channel events. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 711 | channel_after_select(readset, writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 712 | |
| 713 | /* Process input from the client and from program stdout/stderr. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 714 | process_input(readset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 715 | |
| 716 | /* Process output to the client and to program stdin. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 717 | process_output(writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 718 | } |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 719 | if (readset) |
| 720 | xfree(readset); |
| 721 | if (writeset) |
| 722 | xfree(writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 723 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 724 | /* Cleanup and termination code. */ |
| 725 | |
| 726 | /* Wait until all output has been sent to the client. */ |
| 727 | drain_output(); |
| 728 | |
| 729 | 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] | 730 | stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 731 | |
| 732 | /* Free and clear the buffers. */ |
| 733 | buffer_free(&stdin_buffer); |
| 734 | buffer_free(&stdout_buffer); |
| 735 | buffer_free(&stderr_buffer); |
| 736 | |
| 737 | /* Close the file descriptors. */ |
| 738 | if (fdout != -1) |
| 739 | close(fdout); |
| 740 | fdout = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 741 | fdout_eof = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 742 | if (fderr != -1) |
| 743 | close(fderr); |
| 744 | fderr = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 745 | fderr_eof = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 746 | if (fdin != -1) |
| 747 | close(fdin); |
| 748 | fdin = -1; |
| 749 | |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 750 | channel_free_all(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 751 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 752 | /* We no longer want our SIGCHLD handler to be called. */ |
Kevin Steves | e26a155 | 2001-07-26 17:51:49 +0000 | [diff] [blame] | 753 | mysignal(SIGCHLD, SIG_DFL); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 754 | |
Ben Lindstrom | 47fd811 | 2002-04-02 20:48:19 +0000 | [diff] [blame] | 755 | while ((wait_pid = waitpid(-1, &wait_status, 0)) < 0) |
| 756 | if (errno != EINTR) |
| 757 | packet_disconnect("wait: %.100s", strerror(errno)); |
| 758 | if (wait_pid != pid) |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 759 | error("Strange, wait returned pid %ld, expected %ld", |
| 760 | (long)wait_pid, (long)pid); |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 761 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 762 | /* Check if it exited normally. */ |
| 763 | if (WIFEXITED(wait_status)) { |
| 764 | /* Yes, normal exit. Get exit status and send it to the client. */ |
| 765 | debug("Command exited with status %d.", WEXITSTATUS(wait_status)); |
| 766 | packet_start(SSH_SMSG_EXITSTATUS); |
| 767 | packet_put_int(WEXITSTATUS(wait_status)); |
| 768 | packet_send(); |
| 769 | packet_write_wait(); |
| 770 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 771 | /* |
| 772 | * Wait for exit confirmation. Note that there might be |
| 773 | * other packets coming before it; however, the program has |
| 774 | * already died so we just ignore them. The client is |
| 775 | * supposed to respond with the confirmation when it receives |
| 776 | * the exit status. |
| 777 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 778 | do { |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 779 | type = packet_read(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 780 | } |
| 781 | while (type != SSH_CMSG_EXIT_CONFIRMATION); |
| 782 | |
| 783 | debug("Received exit confirmation."); |
| 784 | return; |
| 785 | } |
| 786 | /* Check if the program terminated due to a signal. */ |
| 787 | if (WIFSIGNALED(wait_status)) |
| 788 | packet_disconnect("Command terminated on signal %d.", |
| 789 | WTERMSIG(wait_status)); |
| 790 | |
| 791 | /* Some weird exit cause. Just exit. */ |
| 792 | packet_disconnect("wait returned status %04x.", wait_status); |
| 793 | /* NOTREACHED */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 794 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 795 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 796 | static void |
| 797 | collect_children(void) |
| 798 | { |
| 799 | pid_t pid; |
| 800 | sigset_t oset, nset; |
| 801 | int status; |
| 802 | |
| 803 | /* block SIGCHLD while we check for dead children */ |
| 804 | sigemptyset(&nset); |
| 805 | sigaddset(&nset, SIGCHLD); |
| 806 | sigprocmask(SIG_BLOCK, &nset, &oset); |
| 807 | if (child_terminated) { |
Damien Miller | ec04f36 | 2006-03-15 12:01:34 +1100 | [diff] [blame] | 808 | debug("Received SIGCHLD."); |
Ben Lindstrom | 47fd811 | 2002-04-02 20:48:19 +0000 | [diff] [blame] | 809 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || |
| 810 | (pid < 0 && errno == EINTR)) |
| 811 | if (pid > 0) |
| 812 | session_close_by_pid(pid, status); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 813 | child_terminated = 0; |
| 814 | } |
| 815 | sigprocmask(SIG_SETMASK, &oset, NULL); |
| 816 | } |
| 817 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 818 | void |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 819 | server_loop2(Authctxt *authctxt) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 820 | { |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 821 | fd_set *readset = NULL, *writeset = NULL; |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 822 | int rekeying = 0, max_fd, nalloc = 0; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 823 | |
| 824 | debug("Entering interactive session for SSH2."); |
| 825 | |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 826 | mysignal(SIGCHLD, sigchld_handler); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 827 | child_terminated = 0; |
| 828 | connection_in = packet_get_connection_in(); |
| 829 | connection_out = packet_get_connection_out(); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 830 | |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 831 | if (!use_privsep) { |
| 832 | signal(SIGTERM, sigterm_handler); |
| 833 | signal(SIGINT, sigterm_handler); |
| 834 | signal(SIGQUIT, sigterm_handler); |
| 835 | } |
| 836 | |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 837 | notify_setup(); |
| 838 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 839 | max_fd = MAX(connection_in, connection_out); |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 840 | max_fd = MAX(max_fd, notify_pipe[0]); |
| 841 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 842 | server_init_dispatch(); |
| 843 | |
| 844 | for (;;) { |
| 845 | process_buffered_input_packets(); |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 846 | |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 847 | rekeying = (xxx_kex != NULL && !xxx_kex->done); |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 848 | |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 849 | if (!rekeying && packet_not_very_much_data_to_write()) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 850 | channel_output_poll(); |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 851 | wait_until_can_do_something(&readset, &writeset, &max_fd, |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 852 | &nalloc, 0); |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 853 | |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 854 | if (received_sigterm) { |
| 855 | logit("Exiting on signal %d", received_sigterm); |
| 856 | /* Clean up sessions, utmp, etc. */ |
| 857 | cleanup_exit(255); |
| 858 | } |
| 859 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 860 | collect_children(); |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 861 | if (!rekeying) { |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 862 | channel_after_select(readset, writeset); |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 863 | if (packet_need_rekeying()) { |
| 864 | debug("need rekeying"); |
| 865 | xxx_kex->done = 0; |
| 866 | kex_send_kexinit(xxx_kex); |
| 867 | } |
| 868 | } |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 869 | process_input(readset); |
Ben Lindstrom | e34ab4c | 2001-04-07 01:12:11 +0000 | [diff] [blame] | 870 | if (connection_closed) |
| 871 | break; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 872 | process_output(writeset); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 873 | } |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 874 | collect_children(); |
| 875 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 876 | if (readset) |
| 877 | xfree(readset); |
| 878 | if (writeset) |
| 879 | xfree(writeset); |
| 880 | |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 881 | /* free all channels, no more reads and writes */ |
| 882 | channel_free_all(); |
Ben Lindstrom | 4983d5e | 2001-07-04 05:17:40 +0000 | [diff] [blame] | 883 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 884 | /* free remaining sessions, e.g. remove wtmp entries */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 885 | session_destroy_all(NULL); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 886 | } |
| 887 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 888 | static void |
Damien Miller | b5820f4 | 2003-12-17 16:27:32 +1100 | [diff] [blame] | 889 | server_input_keep_alive(int type, u_int32_t seq, void *ctxt) |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 890 | { |
Damien Miller | b5820f4 | 2003-12-17 16:27:32 +1100 | [diff] [blame] | 891 | debug("Got %d/%u for keepalive", type, seq); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 892 | /* |
Ben Lindstrom | 2f0304c | 2001-04-29 19:49:14 +0000 | [diff] [blame] | 893 | * reset timeout, since we got a sane answer from the client. |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 894 | * even if this was generated by something other than |
| 895 | * the bogus CHANNEL_REQUEST we send for keepalives. |
| 896 | */ |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 897 | packet_set_alive_timeouts(0); |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 898 | } |
| 899 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 900 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 901 | server_input_stdin_data(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 902 | { |
| 903 | char *data; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 904 | u_int data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 905 | |
| 906 | /* Stdin data from the client. Append it to the buffer. */ |
| 907 | /* Ignore any data if the client has closed stdin. */ |
| 908 | if (fdin == -1) |
| 909 | return; |
| 910 | data = packet_get_string(&data_len); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 911 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 912 | buffer_append(&stdin_buffer, data, data_len); |
| 913 | memset(data, 0, data_len); |
| 914 | xfree(data); |
| 915 | } |
| 916 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 917 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 918 | server_input_eof(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 919 | { |
| 920 | /* |
| 921 | * Eof from the client. The stdin descriptor to the |
| 922 | * program will be closed when all buffered data has |
| 923 | * drained. |
| 924 | */ |
| 925 | debug("EOF received for stdin."); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 926 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 927 | stdin_eof = 1; |
| 928 | } |
| 929 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 930 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 931 | server_input_window_size(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 932 | { |
Damien Miller | 71a7367 | 2006-03-26 14:04:36 +1100 | [diff] [blame] | 933 | u_int row = packet_get_int(); |
| 934 | u_int col = packet_get_int(); |
| 935 | u_int xpixel = packet_get_int(); |
| 936 | u_int ypixel = packet_get_int(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 937 | |
| 938 | debug("Window change received."); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 939 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 940 | if (fdin != -1) |
| 941 | pty_change_window_size(fdin, row, col, xpixel, ypixel); |
| 942 | } |
| 943 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 944 | static Channel * |
Damien Miller | fb1310e | 2004-01-21 11:02:50 +1100 | [diff] [blame] | 945 | server_request_direct_tcpip(void) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 946 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 947 | Channel *c; |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 948 | char *target, *originator; |
Damien Miller | 3dc71ad | 2009-01-28 16:31:22 +1100 | [diff] [blame] | 949 | u_short target_port, originator_port; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 950 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 951 | target = packet_get_string(NULL); |
| 952 | target_port = packet_get_int(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 953 | originator = packet_get_string(NULL); |
| 954 | originator_port = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 955 | packet_check_eom(); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 956 | |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 957 | debug("server_request_direct_tcpip: originator %s port %d, target %s " |
| 958 | "port %d", originator, originator_port, target, target_port); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 959 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 960 | /* XXX check permission */ |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 961 | c = channel_connect_to(target, target_port, |
| 962 | "direct-tcpip", "direct-tcpip"); |
| 963 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 964 | xfree(originator); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 965 | xfree(target); |
| 966 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 967 | return c; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 968 | } |
| 969 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 970 | static Channel * |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 971 | server_request_tun(void) |
| 972 | { |
| 973 | Channel *c = NULL; |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 974 | int mode, tun; |
| 975 | int sock; |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 976 | |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 977 | mode = packet_get_int(); |
| 978 | switch (mode) { |
| 979 | case SSH_TUNMODE_POINTOPOINT: |
| 980 | case SSH_TUNMODE_ETHERNET: |
| 981 | break; |
| 982 | default: |
| 983 | packet_send_debug("Unsupported tunnel device mode."); |
| 984 | return NULL; |
| 985 | } |
| 986 | if ((options.permit_tun & mode) == 0) { |
| 987 | packet_send_debug("Server has rejected tunnel device " |
| 988 | "forwarding"); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 989 | return NULL; |
| 990 | } |
| 991 | |
| 992 | tun = packet_get_int(); |
Darren Tucker | 0d0e8f0 | 2005-12-20 16:08:42 +1100 | [diff] [blame] | 993 | if (forced_tun_device != -1) { |
Damien Miller | f0b15df | 2006-03-26 13:59:20 +1100 | [diff] [blame] | 994 | if (tun != SSH_TUNID_ANY && forced_tun_device != tun) |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 995 | goto done; |
| 996 | tun = forced_tun_device; |
| 997 | } |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 998 | sock = tun_open(tun, mode); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 999 | if (sock < 0) |
| 1000 | goto done; |
| 1001 | c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1, |
| 1002 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); |
| 1003 | c->datagram = 1; |
Damien Miller | 598bbc2 | 2005-12-31 16:33:36 +1100 | [diff] [blame] | 1004 | #if defined(SSH_TUN_FILTER) |
| 1005 | if (mode == SSH_TUNMODE_POINTOPOINT) |
| 1006 | channel_register_filter(c->self, sys_tun_infilter, |
Darren Tucker | 1cf65ae | 2008-06-13 05:09:18 +1000 | [diff] [blame] | 1007 | sys_tun_outfilter, NULL, NULL); |
Damien Miller | 598bbc2 | 2005-12-31 16:33:36 +1100 | [diff] [blame] | 1008 | #endif |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1009 | |
| 1010 | done: |
| 1011 | if (c == NULL) |
| 1012 | packet_send_debug("Failed to open the tunnel device."); |
| 1013 | return c; |
| 1014 | } |
| 1015 | |
| 1016 | static Channel * |
Damien Miller | fb1310e | 2004-01-21 11:02:50 +1100 | [diff] [blame] | 1017 | server_request_session(void) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1018 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1019 | Channel *c; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1020 | |
| 1021 | debug("input_session_request"); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1022 | packet_check_eom(); |
Darren Tucker | 8901fa9 | 2008-06-11 09:34:01 +1000 | [diff] [blame] | 1023 | |
| 1024 | if (no_more_sessions) { |
| 1025 | packet_disconnect("Possible attack: attempt to open a session " |
| 1026 | "after additional sessions disabled"); |
| 1027 | } |
| 1028 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1029 | /* |
| 1030 | * A server session has no fd to read or write until a |
| 1031 | * CHANNEL_REQUEST for a shell is made, so we set the type to |
| 1032 | * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all |
| 1033 | * CHANNEL_REQUEST messages is registered. |
| 1034 | */ |
Damien Miller | fb1310e | 2004-01-21 11:02:50 +1100 | [diff] [blame] | 1035 | c = channel_new("session", SSH_CHANNEL_LARVAL, |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1036 | -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1037 | 0, "server-session", 1); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1038 | if (session_open(the_authctxt, c->self) != 1) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1039 | debug("session open failed, free channel %d", c->self); |
| 1040 | channel_free(c); |
| 1041 | return NULL; |
| 1042 | } |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 1043 | channel_register_cleanup(c->self, session_close_by_channel, 0); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1044 | return c; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1045 | } |
| 1046 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1047 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1048 | server_input_channel_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1049 | { |
| 1050 | Channel *c = NULL; |
| 1051 | char *ctype; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1052 | int rchan; |
Ben Lindstrom | 4fed2be | 2002-06-25 23:17:36 +0000 | [diff] [blame] | 1053 | u_int rmaxpack, rwindow, len; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1054 | |
| 1055 | ctype = packet_get_string(&len); |
| 1056 | rchan = packet_get_int(); |
| 1057 | rwindow = packet_get_int(); |
| 1058 | rmaxpack = packet_get_int(); |
| 1059 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1060 | 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] | 1061 | ctype, rchan, rwindow, rmaxpack); |
| 1062 | |
| 1063 | if (strcmp(ctype, "session") == 0) { |
Damien Miller | fb1310e | 2004-01-21 11:02:50 +1100 | [diff] [blame] | 1064 | c = server_request_session(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1065 | } else if (strcmp(ctype, "direct-tcpip") == 0) { |
Damien Miller | fb1310e | 2004-01-21 11:02:50 +1100 | [diff] [blame] | 1066 | c = server_request_direct_tcpip(); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1067 | } else if (strcmp(ctype, "tun@openssh.com") == 0) { |
| 1068 | c = server_request_tun(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1069 | } |
| 1070 | if (c != NULL) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1071 | debug("server_input_channel_open: confirm %s", ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1072 | c->remote_id = rchan; |
| 1073 | c->remote_window = rwindow; |
| 1074 | c->remote_maxpacket = rmaxpack; |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1075 | if (c->type != SSH_CHANNEL_CONNECTING) { |
| 1076 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1077 | packet_put_int(c->remote_id); |
| 1078 | packet_put_int(c->self); |
| 1079 | packet_put_int(c->local_window); |
| 1080 | packet_put_int(c->local_maxpacket); |
| 1081 | packet_send(); |
| 1082 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1083 | } else { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1084 | debug("server_input_channel_open: failure %s", ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1085 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
| 1086 | packet_put_int(rchan); |
| 1087 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 1088 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1089 | packet_put_cstring("open failed"); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 1090 | packet_put_cstring(""); |
| 1091 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1092 | packet_send(); |
| 1093 | } |
| 1094 | xfree(ctype); |
| 1095 | } |
| 1096 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1097 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1098 | server_input_global_request(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1099 | { |
| 1100 | char *rtype; |
| 1101 | int want_reply; |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 1102 | int success = 0, allocated_listen_port = 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1103 | |
| 1104 | rtype = packet_get_string(NULL); |
| 1105 | want_reply = packet_get_char(); |
| 1106 | 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] | 1107 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 1108 | /* -R style forwarding */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1109 | if (strcmp(rtype, "tcpip-forward") == 0) { |
| 1110 | struct passwd *pw; |
| 1111 | char *listen_address; |
| 1112 | u_short listen_port; |
| 1113 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1114 | pw = the_authctxt->pw; |
Damien Miller | 4bb1dd3 | 2003-11-18 22:01:25 +1100 | [diff] [blame] | 1115 | if (pw == NULL || !the_authctxt->valid) |
Damien Miller | 3e3b514 | 2003-11-17 21:13:40 +1100 | [diff] [blame] | 1116 | fatal("server_input_global_request: no/invalid user"); |
Damien Miller | 9fc7c69 | 2003-06-04 22:50:54 +1000 | [diff] [blame] | 1117 | listen_address = packet_get_string(NULL); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1118 | listen_port = (u_short)packet_get_int(); |
| 1119 | debug("server_input_global_request: tcpip-forward listen %s port %d", |
| 1120 | listen_address, listen_port); |
| 1121 | |
| 1122 | /* check permissions */ |
| 1123 | if (!options.allow_tcp_forwarding || |
Damien Miller | 330d585 | 2009-02-14 16:33:09 +1100 | [diff] [blame] | 1124 | no_port_forwarding_flag || |
| 1125 | (!want_reply && listen_port == 0) |
Ben Lindstrom | 99a4e14 | 2002-07-09 14:06:40 +0000 | [diff] [blame] | 1126 | #ifndef NO_IPPORT_RESERVED_CONCEPT |
Damien Miller | 330d585 | 2009-02-14 16:33:09 +1100 | [diff] [blame] | 1127 | || (listen_port < IPPORT_RESERVED && pw->pw_uid != 0) |
Ben Lindstrom | 99a4e14 | 2002-07-09 14:06:40 +0000 | [diff] [blame] | 1128 | #endif |
Damien Miller | b6f72f5 | 2005-07-17 17:26:43 +1000 | [diff] [blame] | 1129 | ) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1130 | success = 0; |
| 1131 | packet_send_debug("Server has disabled port forwarding."); |
| 1132 | } else { |
| 1133 | /* Start listening on the port */ |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 1134 | success = channel_setup_remote_fwd_listener( |
Damien Miller | 330d585 | 2009-02-14 16:33:09 +1100 | [diff] [blame] | 1135 | listen_address, listen_port, |
| 1136 | &allocated_listen_port, options.gateway_ports); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1137 | } |
| 1138 | xfree(listen_address); |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 1139 | } else if (strcmp(rtype, "cancel-tcpip-forward") == 0) { |
| 1140 | char *cancel_address; |
| 1141 | u_short cancel_port; |
| 1142 | |
| 1143 | cancel_address = packet_get_string(NULL); |
| 1144 | cancel_port = (u_short)packet_get_int(); |
| 1145 | debug("%s: cancel-tcpip-forward addr %s port %d", __func__, |
| 1146 | cancel_address, cancel_port); |
| 1147 | |
| 1148 | success = channel_cancel_rport_listener(cancel_address, |
| 1149 | cancel_port); |
Damien Miller | 6f98a1f | 2006-03-26 13:51:08 +1100 | [diff] [blame] | 1150 | xfree(cancel_address); |
Darren Tucker | 8901fa9 | 2008-06-11 09:34:01 +1000 | [diff] [blame] | 1151 | } else if (strcmp(rtype, "no-more-sessions@openssh.com") == 0) { |
| 1152 | no_more_sessions = 1; |
| 1153 | success = 1; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1154 | } |
| 1155 | if (want_reply) { |
| 1156 | packet_start(success ? |
| 1157 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 1158 | if (success && allocated_listen_port > 0) |
| 1159 | packet_put_int(allocated_listen_port); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1160 | packet_send(); |
| 1161 | packet_write_wait(); |
| 1162 | } |
| 1163 | xfree(rtype); |
| 1164 | } |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 1165 | |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1166 | static void |
| 1167 | server_input_channel_req(int type, u_int32_t seq, void *ctxt) |
| 1168 | { |
| 1169 | Channel *c; |
| 1170 | int id, reply, success = 0; |
| 1171 | char *rtype; |
| 1172 | |
| 1173 | id = packet_get_int(); |
| 1174 | rtype = packet_get_string(NULL); |
| 1175 | reply = packet_get_char(); |
| 1176 | |
| 1177 | debug("server_input_channel_req: channel %d request %s reply %d", |
| 1178 | id, rtype, reply); |
| 1179 | |
| 1180 | if ((c = channel_lookup(id)) == NULL) |
| 1181 | packet_disconnect("server_input_channel_req: " |
| 1182 | "unknown channel %d", id); |
Damien Miller | bab9bd4 | 2008-05-19 16:06:47 +1000 | [diff] [blame] | 1183 | if (!strcmp(rtype, "eow@openssh.com")) { |
| 1184 | packet_check_eom(); |
| 1185 | chan_rcvd_eow(c); |
Darren Tucker | 8810dd4 | 2008-07-02 22:32:14 +1000 | [diff] [blame] | 1186 | } else if ((c->type == SSH_CHANNEL_LARVAL || |
| 1187 | c->type == SSH_CHANNEL_OPEN) && strcmp(c->ctype, "session") == 0) |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1188 | success = session_input_channel_req(c, rtype); |
| 1189 | if (reply) { |
| 1190 | packet_start(success ? |
| 1191 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); |
| 1192 | packet_put_int(c->remote_id); |
| 1193 | packet_send(); |
| 1194 | } |
| 1195 | xfree(rtype); |
| 1196 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1197 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1198 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1199 | server_init_dispatch_20(void) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1200 | { |
| 1201 | debug("server_init_dispatch_20"); |
| 1202 | dispatch_init(&dispatch_protocol_error); |
| 1203 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
| 1204 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); |
| 1205 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); |
| 1206 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); |
| 1207 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open); |
| 1208 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 1209 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1210 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &server_input_channel_req); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1211 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1212 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request); |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 1213 | /* client_alive */ |
Damien Miller | 5a33ec6 | 2008-12-08 09:55:02 +1100 | [diff] [blame] | 1214 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &server_input_keep_alive); |
| 1215 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_keep_alive); |
Damien Miller | b5820f4 | 2003-12-17 16:27:32 +1100 | [diff] [blame] | 1216 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &server_input_keep_alive); |
| 1217 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &server_input_keep_alive); |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 1218 | /* rekeying */ |
| 1219 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1220 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1221 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1222 | server_init_dispatch_13(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1223 | { |
| 1224 | debug("server_init_dispatch_13"); |
| 1225 | dispatch_init(NULL); |
| 1226 | dispatch_set(SSH_CMSG_EOF, &server_input_eof); |
| 1227 | dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data); |
| 1228 | dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size); |
| 1229 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); |
| 1230 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); |
| 1231 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); |
| 1232 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 1233 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
| 1234 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); |
| 1235 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1236 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1237 | server_init_dispatch_15(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1238 | { |
| 1239 | server_init_dispatch_13(); |
| 1240 | debug("server_init_dispatch_15"); |
| 1241 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); |
| 1242 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose); |
| 1243 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1244 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1245 | server_init_dispatch(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1246 | { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1247 | if (compat20) |
| 1248 | server_init_dispatch_20(); |
| 1249 | else if (compat13) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1250 | server_init_dispatch_13(); |
| 1251 | else |
| 1252 | server_init_dispatch_15(); |
| 1253 | } |