Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 4 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 5 | * Server main loop for handling the interactive session. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 6 | * |
| 7 | * As far as I am concerned, the code I have written for this software |
| 8 | * can be used freely for any purpose. Any derived versions of this |
| 9 | * software must be clearly marked as such, and if the derived work is |
| 10 | * incompatible with the protocol description in the RFC file, it must be |
| 11 | * called by a name other than "ssh" or "Secure Shell". |
| 12 | * |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 13 | * SSH2 support by Markus Friedl. |
Ben Lindstrom | 92a2e38 | 2001-03-05 06:59:27 +0000 | [diff] [blame] | 14 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 15 | * |
| 16 | * Redistribution and use in source and binary forms, with or without |
| 17 | * modification, are permitted provided that the following conditions |
| 18 | * are met: |
| 19 | * 1. Redistributions of source code must retain the above copyright |
| 20 | * notice, this list of conditions and the following disclaimer. |
| 21 | * 2. Redistributions in binary form must reproduce the above copyright |
| 22 | * notice, this list of conditions and the following disclaimer in the |
| 23 | * documentation and/or other materials provided with the distribution. |
| 24 | * |
| 25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 35 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 36 | |
| 37 | #include "includes.h" |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 38 | RCSID("$OpenBSD: serverloop.c,v 1.64 2001/05/04 23:47:34 markus Exp $"); |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 39 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 40 | #include "xmalloc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 41 | #include "packet.h" |
| 42 | #include "buffer.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 43 | #include "log.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 44 | #include "servconf.h" |
Ben Lindstrom | d95c09c | 2001-02-18 19:13:33 +0000 | [diff] [blame] | 45 | #include "sshpty.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 46 | #include "channels.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 47 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 48 | #include "ssh1.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 49 | #include "ssh2.h" |
Ben Lindstrom | db65e8f | 2001-01-19 04:26:52 +0000 | [diff] [blame] | 50 | #include "auth.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 51 | #include "session.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 52 | #include "dispatch.h" |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 53 | #include "auth-options.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 54 | #include "serverloop.h" |
| 55 | #include "misc.h" |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 56 | #include "kex.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 57 | |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 58 | extern ServerOptions options; |
| 59 | |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 60 | /* XXX */ |
| 61 | extern Kex *xxx_kex; |
| 62 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 63 | static Buffer stdin_buffer; /* Buffer for stdin data. */ |
| 64 | static Buffer stdout_buffer; /* Buffer for stdout data. */ |
| 65 | static Buffer stderr_buffer; /* Buffer for stderr data. */ |
| 66 | static int fdin; /* Descriptor for stdin (for writing) */ |
| 67 | static int fdout; /* Descriptor for stdout (for reading); |
| 68 | May be same number as fdin. */ |
| 69 | static int fderr; /* Descriptor for stderr. May be -1. */ |
| 70 | static long stdin_bytes = 0; /* Number of bytes written to stdin. */ |
| 71 | static long stdout_bytes = 0; /* Number of stdout bytes sent to client. */ |
| 72 | static long stderr_bytes = 0; /* Number of stderr bytes sent to client. */ |
| 73 | static long fdout_bytes = 0; /* Number of stdout bytes read from program. */ |
| 74 | static int stdin_eof = 0; /* EOF message received from client. */ |
| 75 | static int fdout_eof = 0; /* EOF encountered reading from fdout. */ |
| 76 | static int fderr_eof = 0; /* EOF encountered readung from fderr. */ |
Damien Miller | 225736c | 2001-02-19 21:51:08 +1100 | [diff] [blame] | 77 | static int fdin_is_tty = 0; /* fdin points to a tty. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 78 | static int connection_in; /* Connection to client (input). */ |
| 79 | static int connection_out; /* Connection to client (output). */ |
Ben Lindstrom | e34ab4c | 2001-04-07 01:12:11 +0000 | [diff] [blame] | 80 | static int connection_closed = 0; /* Connection to client closed. */ |
| 81 | static u_int buffer_high; /* "Soft" max buffer size. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 82 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 83 | /* |
| 84 | * This SIGCHLD kludge is used to detect when the child exits. The server |
| 85 | * will exit after that, as soon as forwarded connections have terminated. |
| 86 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 87 | |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 88 | static pid_t child_pid; /* Pid of the child. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 89 | static volatile int child_terminated; /* The child has terminated. */ |
| 90 | static volatile int child_wait_status; /* Status from wait(). */ |
| 91 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 92 | void server_init_dispatch(void); |
| 93 | |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 94 | int client_alive_timeouts = 0; |
| 95 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 96 | void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 97 | sigchld_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 98 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 99 | int save_errno = errno; |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 100 | pid_t wait_pid; |
| 101 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 102 | debug("Received SIGCHLD."); |
| 103 | wait_pid = wait((int *) &child_wait_status); |
| 104 | if (wait_pid != -1) { |
| 105 | if (wait_pid != child_pid) |
| 106 | error("Strange, got SIGCHLD and wait returned pid %d but child is %d", |
| 107 | wait_pid, child_pid); |
| 108 | if (WIFEXITED(child_wait_status) || |
Damien Miller | 43dc8da | 2000-11-29 15:55:17 +1100 | [diff] [blame] | 109 | WIFSIGNALED(child_wait_status)) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 110 | child_terminated = 1; |
| 111 | } |
| 112 | signal(SIGCHLD, sigchld_handler); |
| 113 | errno = save_errno; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 114 | } |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 115 | void |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 116 | sigchld_handler2(int sig) |
| 117 | { |
| 118 | int save_errno = errno; |
| 119 | debug("Received SIGCHLD."); |
| 120 | child_terminated = 1; |
Kevin Steves | b6e773a | 2001-02-04 13:20:36 +0000 | [diff] [blame] | 121 | mysignal(SIGCHLD, sigchld_handler2); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 122 | errno = save_errno; |
| 123 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 124 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 125 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 126 | * Make packets from buffered stderr data, and buffer it for sending |
| 127 | * to the client. |
| 128 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 129 | void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 130 | make_packets_from_stderr_data(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 131 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 132 | int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 133 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 134 | /* Send buffered stderr data to the client. */ |
| 135 | while (buffer_len(&stderr_buffer) > 0 && |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 136 | packet_not_very_much_data_to_write()) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 137 | len = buffer_len(&stderr_buffer); |
| 138 | if (packet_is_interactive()) { |
| 139 | if (len > 512) |
| 140 | len = 512; |
| 141 | } else { |
| 142 | /* Keep the packets at reasonable size. */ |
| 143 | if (len > packet_get_maxsize()) |
| 144 | len = packet_get_maxsize(); |
| 145 | } |
| 146 | packet_start(SSH_SMSG_STDERR_DATA); |
| 147 | packet_put_string(buffer_ptr(&stderr_buffer), len); |
| 148 | packet_send(); |
| 149 | buffer_consume(&stderr_buffer, len); |
| 150 | stderr_bytes += len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 151 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 152 | } |
| 153 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 154 | /* |
| 155 | * Make packets from buffered stdout data, and buffer it for sending to the |
| 156 | * client. |
| 157 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 158 | void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 159 | make_packets_from_stdout_data(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 160 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 161 | int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 162 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 163 | /* Send buffered stdout data to the client. */ |
| 164 | while (buffer_len(&stdout_buffer) > 0 && |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 165 | packet_not_very_much_data_to_write()) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 166 | len = buffer_len(&stdout_buffer); |
| 167 | if (packet_is_interactive()) { |
| 168 | if (len > 512) |
| 169 | len = 512; |
| 170 | } else { |
| 171 | /* Keep the packets at reasonable size. */ |
| 172 | if (len > packet_get_maxsize()) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 173 | len = packet_get_maxsize(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 174 | } |
| 175 | packet_start(SSH_SMSG_STDOUT_DATA); |
| 176 | packet_put_string(buffer_ptr(&stdout_buffer), len); |
| 177 | packet_send(); |
| 178 | buffer_consume(&stdout_buffer, len); |
| 179 | stdout_bytes += len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 180 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 181 | } |
| 182 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 183 | /* |
| 184 | * Sleep in select() until we can do something. This will initialize the |
| 185 | * select masks. Upon return, the masks will indicate which descriptors |
| 186 | * have data or can accept data. Optionally, a maximum time can be specified |
| 187 | * for the duration of the wait (0 = infinite). |
| 188 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 189 | void |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 190 | wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
| 191 | u_int max_time_milliseconds) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 192 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 193 | struct timeval tv, *tvp; |
| 194 | int ret; |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 195 | int client_alive_scheduled = 0; |
| 196 | |
| 197 | /* |
| 198 | * if using client_alive, set the max timeout accordingly, |
| 199 | * and indicate that this particular timeout was for client |
| 200 | * alive by setting the client_alive_scheduled flag. |
| 201 | * |
| 202 | * this could be randomized somewhat to make traffic |
| 203 | * analysis more difficult, but we're not doing it yet. |
| 204 | */ |
| 205 | if (max_time_milliseconds == 0 && options.client_alive_interval) { |
Ben Lindstrom | 2f0304c | 2001-04-29 19:49:14 +0000 | [diff] [blame] | 206 | client_alive_scheduled = 1; |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 207 | max_time_milliseconds = options.client_alive_interval * 1000; |
| 208 | } else |
Ben Lindstrom | 2f0304c | 2001-04-29 19:49:14 +0000 | [diff] [blame] | 209 | client_alive_scheduled = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 210 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 211 | /* When select fails we restart from here. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 212 | retry_select: |
| 213 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 214 | /* Allocate and update select() masks for channel descriptors. */ |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 215 | channel_prepare_select(readsetp, writesetp, maxfdp, 0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 216 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 217 | if (compat20) { |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 218 | /* wrong: bad condition XXX */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 219 | if (channel_not_very_much_buffered_data()) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 220 | FD_SET(connection_in, *readsetp); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 221 | } else { |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 222 | /* |
| 223 | * Read packets from the client unless we have too much |
| 224 | * buffered stdin or channel data. |
| 225 | */ |
| 226 | if (buffer_len(&stdin_buffer) < buffer_high && |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 227 | channel_not_very_much_buffered_data()) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 228 | FD_SET(connection_in, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 229 | /* |
| 230 | * If there is not too much data already buffered going to |
| 231 | * the client, try to get some more data from the program. |
| 232 | */ |
| 233 | if (packet_not_very_much_data_to_write()) { |
| 234 | if (!fdout_eof) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 235 | FD_SET(fdout, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 236 | if (!fderr_eof) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 237 | FD_SET(fderr, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 238 | } |
| 239 | /* |
| 240 | * If we have buffered data, try to write some of that data |
| 241 | * to the program. |
| 242 | */ |
| 243 | if (fdin != -1 && buffer_len(&stdin_buffer) > 0) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 244 | FD_SET(fdin, *writesetp); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 245 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 246 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 247 | /* |
| 248 | * If we have buffered packet data going to the client, mark that |
| 249 | * descriptor. |
| 250 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 251 | if (packet_have_data_to_write()) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 252 | FD_SET(connection_out, *writesetp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 253 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 254 | /* |
| 255 | * If child has terminated and there is enough buffer space to read |
| 256 | * from it, then read as much as is available and exit. |
| 257 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 258 | if (child_terminated && packet_not_very_much_data_to_write()) |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 259 | if (max_time_milliseconds == 0 || client_alive_scheduled) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 260 | max_time_milliseconds = 100; |
| 261 | |
| 262 | if (max_time_milliseconds == 0) |
| 263 | tvp = NULL; |
| 264 | else { |
| 265 | tv.tv_sec = max_time_milliseconds / 1000; |
| 266 | tv.tv_usec = 1000 * (max_time_milliseconds % 1000); |
| 267 | tvp = &tv; |
| 268 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 269 | if (tvp!=NULL) |
Ben Lindstrom | f4c7311 | 2001-03-05 05:58:23 +0000 | [diff] [blame] | 270 | debug3("tvp!=NULL kid %d mili %d", child_terminated, max_time_milliseconds); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 271 | |
| 272 | /* Wait for something to happen, or the timeout to expire. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 273 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 274 | |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 275 | if (ret == -1) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 276 | if (errno != EINTR) |
| 277 | error("select: %.100s", strerror(errno)); |
| 278 | else |
| 279 | goto retry_select; |
| 280 | } |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 281 | if (ret == 0 && client_alive_scheduled) { |
| 282 | /* timeout, check to see how many we have had */ |
| 283 | client_alive_timeouts++; |
| 284 | |
| 285 | if (client_alive_timeouts > options.client_alive_count_max ) { |
| 286 | packet_disconnect( |
| 287 | "Timeout, your session not responding."); |
| 288 | } else { |
| 289 | /* |
| 290 | * send a bogus channel request with "wantreply" |
| 291 | * we should get back a failure |
| 292 | */ |
| 293 | int id; |
| 294 | |
| 295 | id = channel_find_open(); |
| 296 | if (id != -1) { |
| 297 | channel_request_start(id, |
| 298 | "keepalive@openssh.com", 1); |
| 299 | packet_send(); |
| 300 | } else |
| 301 | packet_disconnect( |
| 302 | "No open channels after timeout!"); |
| 303 | } |
| 304 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 305 | } |
| 306 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 307 | /* |
| 308 | * Processes input from the client and the program. Input data is stored |
| 309 | * in buffers and processed later. |
| 310 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 311 | void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 312 | process_input(fd_set * readset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 313 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 314 | int len; |
| 315 | char buf[16384]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 316 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 317 | /* Read and buffer any input data from the client. */ |
| 318 | if (FD_ISSET(connection_in, readset)) { |
| 319 | len = read(connection_in, buf, sizeof(buf)); |
| 320 | if (len == 0) { |
| 321 | verbose("Connection closed by remote host."); |
Ben Lindstrom | e34ab4c | 2001-04-07 01:12:11 +0000 | [diff] [blame] | 322 | connection_closed = 1; |
| 323 | if (compat20) |
| 324 | return; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 325 | fatal_cleanup(); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 326 | } else if (len < 0) { |
| 327 | if (errno != EINTR && errno != EAGAIN) { |
| 328 | verbose("Read error from remote host: %.100s", strerror(errno)); |
| 329 | fatal_cleanup(); |
| 330 | } |
| 331 | } else { |
| 332 | /* Buffer any received data. */ |
| 333 | packet_process_incoming(buf, len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 334 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 335 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 336 | if (compat20) |
| 337 | return; |
| 338 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 339 | /* Read and buffer any available stdout data from the program. */ |
| 340 | if (!fdout_eof && FD_ISSET(fdout, readset)) { |
| 341 | len = read(fdout, buf, sizeof(buf)); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 342 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { |
| 343 | /* do nothing */ |
| 344 | } else if (len <= 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 345 | fdout_eof = 1; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 346 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 347 | buffer_append(&stdout_buffer, buf, len); |
| 348 | fdout_bytes += len; |
| 349 | } |
| 350 | } |
| 351 | /* Read and buffer any available stderr data from the program. */ |
| 352 | if (!fderr_eof && FD_ISSET(fderr, readset)) { |
| 353 | len = read(fderr, buf, sizeof(buf)); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 354 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { |
| 355 | /* do nothing */ |
| 356 | } else if (len <= 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 357 | fderr_eof = 1; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 358 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 359 | buffer_append(&stderr_buffer, buf, len); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 360 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 361 | } |
| 362 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 363 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 364 | /* |
| 365 | * Sends data from internal buffers to client program stdin. |
| 366 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 367 | void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 368 | process_output(fd_set * writeset) |
| 369 | { |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 370 | struct termios tio; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 371 | int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 372 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 373 | /* Write buffered data to program stdin. */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 374 | if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 375 | len = write(fdin, buffer_ptr(&stdin_buffer), |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 376 | buffer_len(&stdin_buffer)); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 377 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { |
| 378 | /* do nothing */ |
| 379 | } else if (len <= 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 380 | #ifdef USE_PIPES |
| 381 | close(fdin); |
| 382 | #else |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 383 | if (fdin != fdout) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 384 | close(fdin); |
| 385 | else |
| 386 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ |
| 387 | #endif |
| 388 | fdin = -1; |
| 389 | } else { |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 390 | /* Successful write. */ |
Damien Miller | 225736c | 2001-02-19 21:51:08 +1100 | [diff] [blame] | 391 | if (fdin_is_tty && tcgetattr(fdin, &tio) == 0 && |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 392 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { |
Kevin Steves | b7f036f | 2001-02-15 17:27:15 +0000 | [diff] [blame] | 393 | /* |
| 394 | * Simulate echo to reduce the impact of |
| 395 | * traffic analysis |
| 396 | */ |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 397 | packet_send_ignore(len); |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 398 | packet_send(); |
| 399 | } |
| 400 | /* Consume the data from the buffer. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 401 | buffer_consume(&stdin_buffer, len); |
| 402 | /* Update the count of bytes written to the program. */ |
| 403 | stdin_bytes += len; |
| 404 | } |
| 405 | } |
| 406 | /* Send any buffered packet data to the client. */ |
| 407 | if (FD_ISSET(connection_out, writeset)) |
| 408 | packet_write_poll(); |
| 409 | } |
| 410 | |
| 411 | /* |
| 412 | * Wait until all buffered output has been sent to the client. |
| 413 | * This is used when the program terminates. |
| 414 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 415 | void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 416 | drain_output(void) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 417 | { |
| 418 | /* Send any buffered stdout data to the client. */ |
| 419 | if (buffer_len(&stdout_buffer) > 0) { |
| 420 | packet_start(SSH_SMSG_STDOUT_DATA); |
| 421 | packet_put_string(buffer_ptr(&stdout_buffer), |
| 422 | buffer_len(&stdout_buffer)); |
| 423 | packet_send(); |
| 424 | /* Update the count of sent bytes. */ |
| 425 | stdout_bytes += buffer_len(&stdout_buffer); |
| 426 | } |
| 427 | /* Send any buffered stderr data to the client. */ |
| 428 | if (buffer_len(&stderr_buffer) > 0) { |
| 429 | packet_start(SSH_SMSG_STDERR_DATA); |
| 430 | packet_put_string(buffer_ptr(&stderr_buffer), |
| 431 | buffer_len(&stderr_buffer)); |
| 432 | packet_send(); |
| 433 | /* Update the count of sent bytes. */ |
| 434 | stderr_bytes += buffer_len(&stderr_buffer); |
| 435 | } |
| 436 | /* Wait until all buffered data has been written to the client. */ |
| 437 | packet_write_wait(); |
| 438 | } |
| 439 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 440 | void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 441 | process_buffered_input_packets(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 442 | { |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 443 | dispatch_run(DISPATCH_NONBLOCK, NULL, compat20 ? xxx_kex : NULL); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 444 | } |
| 445 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 446 | /* |
| 447 | * Performs the interactive session. This handles data transmission between |
| 448 | * the client and the program. Note that the notion of stdin, stdout, and |
| 449 | * stderr in this function is sort of reversed: this function writes to |
| 450 | * stdin (of the child program), and reads from stdout and stderr (of the |
| 451 | * child program). |
| 452 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 453 | void |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 454 | 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] | 455 | { |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 456 | fd_set *readset = NULL, *writeset = NULL; |
| 457 | int max_fd; |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 458 | int wait_status; /* Status returned by wait(). */ |
| 459 | pid_t wait_pid; /* pid returned by wait(). */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 460 | int waiting_termination = 0; /* Have displayed waiting close message. */ |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 461 | u_int max_time_milliseconds; |
| 462 | u_int previous_stdout_buffer_bytes; |
| 463 | u_int stdout_buffer_bytes; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 464 | int type; |
| 465 | |
| 466 | debug("Entering interactive session."); |
| 467 | |
| 468 | /* Initialize the SIGCHLD kludge. */ |
| 469 | child_pid = pid; |
| 470 | child_terminated = 0; |
| 471 | signal(SIGCHLD, sigchld_handler); |
| 472 | |
| 473 | /* Initialize our global variables. */ |
| 474 | fdin = fdin_arg; |
| 475 | fdout = fdout_arg; |
| 476 | fderr = fderr_arg; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 477 | |
| 478 | /* nonblocking IO */ |
| 479 | set_nonblock(fdin); |
| 480 | set_nonblock(fdout); |
Damien Miller | 7d6656c | 2000-05-20 15:22:36 +1000 | [diff] [blame] | 481 | /* we don't have stderr for interactive terminal sessions, see below */ |
| 482 | if (fderr != -1) |
| 483 | set_nonblock(fderr); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 484 | |
Damien Miller | 225736c | 2001-02-19 21:51:08 +1100 | [diff] [blame] | 485 | if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin)) |
| 486 | fdin_is_tty = 1; |
| 487 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 488 | connection_in = packet_get_connection_in(); |
| 489 | connection_out = packet_get_connection_out(); |
| 490 | |
| 491 | previous_stdout_buffer_bytes = 0; |
| 492 | |
| 493 | /* Set approximate I/O buffer size. */ |
| 494 | if (packet_is_interactive()) |
| 495 | buffer_high = 4096; |
| 496 | else |
| 497 | buffer_high = 64 * 1024; |
| 498 | |
| 499 | /* Initialize max_fd to the maximum of the known file descriptors. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 500 | max_fd = MAX(fdin, fdout); |
| 501 | if (fderr != -1) |
| 502 | max_fd = MAX(max_fd, fderr); |
| 503 | max_fd = MAX(max_fd, connection_in); |
| 504 | max_fd = MAX(max_fd, connection_out); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 505 | |
| 506 | /* Initialize Initialize buffers. */ |
| 507 | buffer_init(&stdin_buffer); |
| 508 | buffer_init(&stdout_buffer); |
| 509 | buffer_init(&stderr_buffer); |
| 510 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 511 | /* |
| 512 | * If we have no separate fderr (which is the case when we have a pty |
| 513 | * - there we cannot make difference between data sent to stdout and |
| 514 | * stderr), indicate that we have seen an EOF from stderr. This way |
| 515 | * we don\'t need to check the descriptor everywhere. |
| 516 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 517 | if (fderr == -1) |
| 518 | fderr_eof = 1; |
| 519 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 520 | server_init_dispatch(); |
| 521 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 522 | /* Main loop of the server for the interactive session mode. */ |
| 523 | for (;;) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 524 | |
| 525 | /* Process buffered packets from the client. */ |
| 526 | process_buffered_input_packets(); |
| 527 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 528 | /* |
| 529 | * If we have received eof, and there is no more pending |
| 530 | * input data, cause a real eof by closing fdin. |
| 531 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 532 | if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) { |
| 533 | #ifdef USE_PIPES |
| 534 | close(fdin); |
| 535 | #else |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 536 | if (fdin != fdout) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 537 | close(fdin); |
| 538 | else |
| 539 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ |
| 540 | #endif |
| 541 | fdin = -1; |
| 542 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 543 | /* Make packets from buffered stderr data to send to the client. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 544 | make_packets_from_stderr_data(); |
| 545 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 546 | /* |
| 547 | * Make packets from buffered stdout data to send to the |
| 548 | * client. If there is very little to send, this arranges to |
| 549 | * not send them now, but to wait a short while to see if we |
| 550 | * are getting more data. This is necessary, as some systems |
| 551 | * wake up readers from a pty after each separate character. |
| 552 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 553 | max_time_milliseconds = 0; |
| 554 | stdout_buffer_bytes = buffer_len(&stdout_buffer); |
| 555 | if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 && |
| 556 | stdout_buffer_bytes != previous_stdout_buffer_bytes) { |
| 557 | /* try again after a while */ |
| 558 | max_time_milliseconds = 10; |
| 559 | } else { |
| 560 | /* Send it now. */ |
| 561 | make_packets_from_stdout_data(); |
| 562 | } |
| 563 | previous_stdout_buffer_bytes = buffer_len(&stdout_buffer); |
| 564 | |
| 565 | /* Send channel data to the client. */ |
| 566 | if (packet_not_very_much_data_to_write()) |
| 567 | channel_output_poll(); |
| 568 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 569 | /* |
| 570 | * Bail out of the loop if the program has closed its output |
| 571 | * descriptors, and we have no more data to send to the |
| 572 | * client, and there is no pending buffered data. |
| 573 | */ |
Damien Miller | 43dc8da | 2000-11-29 15:55:17 +1100 | [diff] [blame] | 574 | if (fdout_eof && fderr_eof && !packet_have_data_to_write() && |
| 575 | buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 576 | if (!channel_still_open()) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 577 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 578 | if (!waiting_termination) { |
| 579 | const char *s = "Waiting for forwarded connections to terminate...\r\n"; |
| 580 | char *cp; |
| 581 | waiting_termination = 1; |
| 582 | buffer_append(&stderr_buffer, s, strlen(s)); |
| 583 | |
| 584 | /* Display list of open channels. */ |
| 585 | cp = channel_open_message(); |
| 586 | buffer_append(&stderr_buffer, cp, strlen(cp)); |
| 587 | xfree(cp); |
| 588 | } |
| 589 | } |
| 590 | /* Sleep in select() until we can do something. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 591 | wait_until_can_do_something(&readset, &writeset, &max_fd, |
| 592 | max_time_milliseconds); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 593 | |
| 594 | /* Process any channel events. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 595 | channel_after_select(readset, writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 596 | |
| 597 | /* Process input from the client and from program stdout/stderr. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 598 | process_input(readset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 599 | |
| 600 | /* Process output to the client and to program stdin. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 601 | process_output(writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 602 | } |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 603 | if (readset) |
| 604 | xfree(readset); |
| 605 | if (writeset) |
| 606 | xfree(writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 607 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 608 | /* Cleanup and termination code. */ |
| 609 | |
| 610 | /* Wait until all output has been sent to the client. */ |
| 611 | drain_output(); |
| 612 | |
| 613 | debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.", |
| 614 | stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes); |
| 615 | |
| 616 | /* Free and clear the buffers. */ |
| 617 | buffer_free(&stdin_buffer); |
| 618 | buffer_free(&stdout_buffer); |
| 619 | buffer_free(&stderr_buffer); |
| 620 | |
| 621 | /* Close the file descriptors. */ |
| 622 | if (fdout != -1) |
| 623 | close(fdout); |
| 624 | fdout = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 625 | fdout_eof = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 626 | if (fderr != -1) |
| 627 | close(fderr); |
| 628 | fderr = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 629 | fderr_eof = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 630 | if (fdin != -1) |
| 631 | close(fdin); |
| 632 | fdin = -1; |
| 633 | |
| 634 | /* Stop listening for channels; this removes unix domain sockets. */ |
| 635 | channel_stop_listening(); |
| 636 | |
| 637 | /* Wait for the child to exit. Get its exit status. */ |
| 638 | wait_pid = wait(&wait_status); |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 639 | if (wait_pid == -1) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 640 | /* |
| 641 | * It is possible that the wait was handled by SIGCHLD |
| 642 | * handler. This may result in either: this call |
| 643 | * returning with EINTR, or: this call returning ECHILD. |
| 644 | */ |
| 645 | if (child_terminated) |
| 646 | wait_status = child_wait_status; |
| 647 | else |
| 648 | packet_disconnect("wait: %.100s", strerror(errno)); |
| 649 | } else { |
| 650 | /* Check if it matches the process we forked. */ |
| 651 | if (wait_pid != pid) |
| 652 | error("Strange, wait returned pid %d, expected %d", |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 653 | wait_pid, pid); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 654 | } |
| 655 | |
| 656 | /* We no longer want our SIGCHLD handler to be called. */ |
| 657 | signal(SIGCHLD, SIG_DFL); |
| 658 | |
| 659 | /* Check if it exited normally. */ |
| 660 | if (WIFEXITED(wait_status)) { |
| 661 | /* Yes, normal exit. Get exit status and send it to the client. */ |
| 662 | debug("Command exited with status %d.", WEXITSTATUS(wait_status)); |
| 663 | packet_start(SSH_SMSG_EXITSTATUS); |
| 664 | packet_put_int(WEXITSTATUS(wait_status)); |
| 665 | packet_send(); |
| 666 | packet_write_wait(); |
| 667 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 668 | /* |
| 669 | * Wait for exit confirmation. Note that there might be |
| 670 | * other packets coming before it; however, the program has |
| 671 | * already died so we just ignore them. The client is |
| 672 | * supposed to respond with the confirmation when it receives |
| 673 | * the exit status. |
| 674 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 675 | do { |
| 676 | int plen; |
| 677 | type = packet_read(&plen); |
| 678 | } |
| 679 | while (type != SSH_CMSG_EXIT_CONFIRMATION); |
| 680 | |
| 681 | debug("Received exit confirmation."); |
| 682 | return; |
| 683 | } |
| 684 | /* Check if the program terminated due to a signal. */ |
| 685 | if (WIFSIGNALED(wait_status)) |
| 686 | packet_disconnect("Command terminated on signal %d.", |
| 687 | WTERMSIG(wait_status)); |
| 688 | |
| 689 | /* Some weird exit cause. Just exit. */ |
| 690 | packet_disconnect("wait returned status %04x.", wait_status); |
| 691 | /* NOTREACHED */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 692 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 693 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 694 | void |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 695 | server_loop2(void) |
| 696 | { |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 697 | fd_set *readset = NULL, *writeset = NULL; |
Ben Lindstrom | e34ab4c | 2001-04-07 01:12:11 +0000 | [diff] [blame] | 698 | int rekeying = 0, max_fd, status; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 699 | pid_t pid; |
| 700 | |
| 701 | debug("Entering interactive session for SSH2."); |
| 702 | |
Kevin Steves | b6e773a | 2001-02-04 13:20:36 +0000 | [diff] [blame] | 703 | mysignal(SIGCHLD, sigchld_handler2); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 704 | child_terminated = 0; |
| 705 | connection_in = packet_get_connection_in(); |
| 706 | connection_out = packet_get_connection_out(); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 707 | |
| 708 | max_fd = MAX(connection_in, connection_out); |
| 709 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 710 | server_init_dispatch(); |
| 711 | |
| 712 | for (;;) { |
| 713 | process_buffered_input_packets(); |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 714 | |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 715 | rekeying = (xxx_kex != NULL && !xxx_kex->done); |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 716 | |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 717 | if (!rekeying && packet_not_very_much_data_to_write()) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 718 | channel_output_poll(); |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 719 | wait_until_can_do_something(&readset, &writeset, &max_fd, |
| 720 | rekeying); |
Damien Miller | 43dc8da | 2000-11-29 15:55:17 +1100 | [diff] [blame] | 721 | if (child_terminated) { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 722 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0) |
| 723 | session_close_by_pid(pid, status); |
| 724 | child_terminated = 0; |
| 725 | } |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 726 | if (!rekeying) |
| 727 | channel_after_select(readset, writeset); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 728 | process_input(readset); |
Ben Lindstrom | e34ab4c | 2001-04-07 01:12:11 +0000 | [diff] [blame] | 729 | if (connection_closed) |
| 730 | break; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 731 | process_output(writeset); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 732 | } |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 733 | if (readset) |
| 734 | xfree(readset); |
| 735 | if (writeset) |
| 736 | xfree(writeset); |
| 737 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 738 | signal(SIGCHLD, SIG_DFL); |
| 739 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0) |
| 740 | session_close_by_pid(pid, status); |
| 741 | channel_stop_listening(); |
| 742 | } |
| 743 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 744 | void |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 745 | server_input_channel_failure(int type, int plen, void *ctxt) |
| 746 | { |
| 747 | debug("Got CHANNEL_FAILURE for keepalive"); |
| 748 | /* |
Ben Lindstrom | 2f0304c | 2001-04-29 19:49:14 +0000 | [diff] [blame] | 749 | * reset timeout, since we got a sane answer from the client. |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 750 | * even if this was generated by something other than |
| 751 | * the bogus CHANNEL_REQUEST we send for keepalives. |
| 752 | */ |
| 753 | client_alive_timeouts = 0; |
| 754 | } |
| 755 | |
| 756 | |
| 757 | void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 758 | server_input_stdin_data(int type, int plen, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 759 | { |
| 760 | char *data; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 761 | u_int data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 762 | |
| 763 | /* Stdin data from the client. Append it to the buffer. */ |
| 764 | /* Ignore any data if the client has closed stdin. */ |
| 765 | if (fdin == -1) |
| 766 | return; |
| 767 | data = packet_get_string(&data_len); |
| 768 | packet_integrity_check(plen, (4 + data_len), type); |
| 769 | buffer_append(&stdin_buffer, data, data_len); |
| 770 | memset(data, 0, data_len); |
| 771 | xfree(data); |
| 772 | } |
| 773 | |
| 774 | void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 775 | server_input_eof(int type, int plen, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 776 | { |
| 777 | /* |
| 778 | * Eof from the client. The stdin descriptor to the |
| 779 | * program will be closed when all buffered data has |
| 780 | * drained. |
| 781 | */ |
| 782 | debug("EOF received for stdin."); |
| 783 | packet_integrity_check(plen, 0, type); |
| 784 | stdin_eof = 1; |
| 785 | } |
| 786 | |
| 787 | void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 788 | server_input_window_size(int type, int plen, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 789 | { |
| 790 | int row = packet_get_int(); |
| 791 | int col = packet_get_int(); |
| 792 | int xpixel = packet_get_int(); |
| 793 | int ypixel = packet_get_int(); |
| 794 | |
| 795 | debug("Window change received."); |
| 796 | packet_integrity_check(plen, 4 * 4, type); |
| 797 | if (fdin != -1) |
| 798 | pty_change_window_size(fdin, row, col, xpixel, ypixel); |
| 799 | } |
| 800 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 801 | Channel * |
| 802 | server_request_direct_tcpip(char *ctype) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 803 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 804 | Channel *c; |
| 805 | int sock; |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 806 | char *target, *originator; |
| 807 | int target_port, originator_port; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 808 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 809 | target = packet_get_string(NULL); |
| 810 | target_port = packet_get_int(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 811 | originator = packet_get_string(NULL); |
| 812 | originator_port = packet_get_int(); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 813 | packet_done(); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 814 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 815 | debug("server_request_direct_tcpip: originator %s port %d, target %s port %d", |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 816 | originator, originator_port, target, target_port); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 817 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 818 | /* XXX check permission */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 819 | sock = channel_connect_to(target, target_port); |
| 820 | xfree(target); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 821 | xfree(originator); |
| 822 | if (sock < 0) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 823 | return NULL; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 824 | c = channel_new(ctype, SSH_CHANNEL_CONNECTING, |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 825 | sock, sock, -1, CHAN_TCP_WINDOW_DEFAULT, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 826 | CHAN_TCP_PACKET_DEFAULT, 0, xstrdup("direct-tcpip"), 1); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 827 | if (c == NULL) { |
| 828 | error("server_request_direct_tcpip: channel_new failed"); |
| 829 | close(sock); |
| 830 | } |
| 831 | return c; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 832 | } |
| 833 | |
| 834 | Channel * |
| 835 | server_request_session(char *ctype) |
| 836 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 837 | Channel *c; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 838 | |
| 839 | debug("input_session_request"); |
| 840 | packet_done(); |
| 841 | /* |
| 842 | * A server session has no fd to read or write until a |
| 843 | * CHANNEL_REQUEST for a shell is made, so we set the type to |
| 844 | * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all |
| 845 | * CHANNEL_REQUEST messages is registered. |
| 846 | */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 847 | c = channel_new(ctype, SSH_CHANNEL_LARVAL, |
| 848 | -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT, |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 849 | 0, xstrdup("server-session"), 1); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 850 | if (c == NULL) { |
| 851 | error("server_request_session: channel_new failed"); |
| 852 | return NULL; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 853 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 854 | if (session_open(c->self) != 1) { |
| 855 | debug("session open failed, free channel %d", c->self); |
| 856 | channel_free(c); |
| 857 | return NULL; |
| 858 | } |
| 859 | channel_register_callback(c->self, SSH2_MSG_CHANNEL_REQUEST, |
| 860 | session_input_channel_req, (void *)0); |
| 861 | channel_register_cleanup(c->self, session_close_by_channel); |
| 862 | return c; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 863 | } |
| 864 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 865 | void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 866 | server_input_channel_open(int type, int plen, void *ctxt) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 867 | { |
| 868 | Channel *c = NULL; |
| 869 | char *ctype; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 870 | u_int len; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 871 | int rchan; |
| 872 | int rmaxpack; |
| 873 | int rwindow; |
| 874 | |
| 875 | ctype = packet_get_string(&len); |
| 876 | rchan = packet_get_int(); |
| 877 | rwindow = packet_get_int(); |
| 878 | rmaxpack = packet_get_int(); |
| 879 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 880 | 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] | 881 | ctype, rchan, rwindow, rmaxpack); |
| 882 | |
| 883 | if (strcmp(ctype, "session") == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 884 | c = server_request_session(ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 885 | } else if (strcmp(ctype, "direct-tcpip") == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 886 | c = server_request_direct_tcpip(ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 887 | } |
| 888 | if (c != NULL) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 889 | debug("server_input_channel_open: confirm %s", ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 890 | c->remote_id = rchan; |
| 891 | c->remote_window = rwindow; |
| 892 | c->remote_maxpacket = rmaxpack; |
| 893 | |
| 894 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 895 | packet_put_int(c->remote_id); |
| 896 | packet_put_int(c->self); |
| 897 | packet_put_int(c->local_window); |
| 898 | packet_put_int(c->local_maxpacket); |
| 899 | packet_send(); |
| 900 | } else { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 901 | debug("server_input_channel_open: failure %s", ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 902 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
| 903 | packet_put_int(rchan); |
| 904 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 905 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
| 906 | packet_put_cstring("bla bla"); |
| 907 | packet_put_cstring(""); |
| 908 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 909 | packet_send(); |
| 910 | } |
| 911 | xfree(ctype); |
| 912 | } |
| 913 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 914 | void |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 915 | server_input_global_request(int type, int plen, void *ctxt) |
| 916 | { |
| 917 | char *rtype; |
| 918 | int want_reply; |
| 919 | int success = 0; |
| 920 | |
| 921 | rtype = packet_get_string(NULL); |
| 922 | want_reply = packet_get_char(); |
| 923 | 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] | 924 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 925 | /* -R style forwarding */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 926 | if (strcmp(rtype, "tcpip-forward") == 0) { |
| 927 | struct passwd *pw; |
| 928 | char *listen_address; |
| 929 | u_short listen_port; |
| 930 | |
| 931 | pw = auth_get_user(); |
| 932 | if (pw == NULL) |
| 933 | fatal("server_input_global_request: no user"); |
| 934 | listen_address = packet_get_string(NULL); /* XXX currently ignored */ |
| 935 | listen_port = (u_short)packet_get_int(); |
| 936 | debug("server_input_global_request: tcpip-forward listen %s port %d", |
| 937 | listen_address, listen_port); |
| 938 | |
| 939 | /* check permissions */ |
| 940 | if (!options.allow_tcp_forwarding || |
| 941 | no_port_forwarding_flag || |
| 942 | (listen_port < IPPORT_RESERVED && pw->pw_uid != 0)) { |
| 943 | success = 0; |
| 944 | packet_send_debug("Server has disabled port forwarding."); |
| 945 | } else { |
| 946 | /* Start listening on the port */ |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 947 | success = channel_request_forwarding( |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 948 | listen_address, listen_port, |
| 949 | /*unspec host_to_connect*/ "<unspec host>", |
| 950 | /*unspec port_to_connect*/ 0, |
| 951 | options.gateway_ports, /*remote*/ 1); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 952 | } |
| 953 | xfree(listen_address); |
| 954 | } |
| 955 | if (want_reply) { |
| 956 | packet_start(success ? |
| 957 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); |
| 958 | packet_send(); |
| 959 | packet_write_wait(); |
| 960 | } |
| 961 | xfree(rtype); |
| 962 | } |
| 963 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 964 | void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 965 | server_init_dispatch_20(void) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 966 | { |
| 967 | debug("server_init_dispatch_20"); |
| 968 | dispatch_init(&dispatch_protocol_error); |
| 969 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
| 970 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); |
| 971 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); |
| 972 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); |
| 973 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open); |
| 974 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 975 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
| 976 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &channel_input_channel_request); |
| 977 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 978 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request); |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 979 | /* client_alive */ |
| 980 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_channel_failure); |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 981 | /* rekeying */ |
| 982 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 983 | } |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 984 | void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 985 | server_init_dispatch_13(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 986 | { |
| 987 | debug("server_init_dispatch_13"); |
| 988 | dispatch_init(NULL); |
| 989 | dispatch_set(SSH_CMSG_EOF, &server_input_eof); |
| 990 | dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data); |
| 991 | dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size); |
| 992 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); |
| 993 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); |
| 994 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); |
| 995 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 996 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
| 997 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); |
| 998 | } |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 999 | void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1000 | server_init_dispatch_15(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1001 | { |
| 1002 | server_init_dispatch_13(); |
| 1003 | debug("server_init_dispatch_15"); |
| 1004 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); |
| 1005 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose); |
| 1006 | } |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1007 | void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1008 | server_init_dispatch(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1009 | { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1010 | if (compat20) |
| 1011 | server_init_dispatch_20(); |
| 1012 | else if (compat13) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1013 | server_init_dispatch_13(); |
| 1014 | else |
| 1015 | server_init_dispatch_15(); |
| 1016 | } |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 1017 | |