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 | 4469723 | 2001-07-04 03:32:30 +0000 | [diff] [blame] | 14 | * Copyright (c) 2000, 2001 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" |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 38 | RCSID("$OpenBSD: serverloop.c,v 1.82 2001/10/10 22:18:47 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" |
Ben Lindstrom | c763767 | 2001-06-09 00:36:26 +0000 | [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; |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 62 | static Authctxt *xxx_authctxt; |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 63 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 64 | static Buffer stdin_buffer; /* Buffer for stdin data. */ |
| 65 | static Buffer stdout_buffer; /* Buffer for stdout data. */ |
| 66 | static Buffer stderr_buffer; /* Buffer for stderr data. */ |
| 67 | static int fdin; /* Descriptor for stdin (for writing) */ |
| 68 | static int fdout; /* Descriptor for stdout (for reading); |
| 69 | May be same number as fdin. */ |
| 70 | static int fderr; /* Descriptor for stderr. May be -1. */ |
| 71 | static long stdin_bytes = 0; /* Number of bytes written to stdin. */ |
| 72 | static long stdout_bytes = 0; /* Number of stdout bytes sent to client. */ |
| 73 | static long stderr_bytes = 0; /* Number of stderr bytes sent to client. */ |
| 74 | static long fdout_bytes = 0; /* Number of stdout bytes read from program. */ |
| 75 | static int stdin_eof = 0; /* EOF message received from client. */ |
| 76 | static int fdout_eof = 0; /* EOF encountered reading from fdout. */ |
| 77 | static int fderr_eof = 0; /* EOF encountered readung from fderr. */ |
Damien Miller | 225736c | 2001-02-19 21:51:08 +1100 | [diff] [blame] | 78 | static int fdin_is_tty = 0; /* fdin points to a tty. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 79 | static int connection_in; /* Connection to client (input). */ |
| 80 | static int connection_out; /* Connection to client (output). */ |
Ben Lindstrom | e34ab4c | 2001-04-07 01:12:11 +0000 | [diff] [blame] | 81 | static int connection_closed = 0; /* Connection to client closed. */ |
| 82 | static u_int buffer_high; /* "Soft" max buffer size. */ |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 83 | static int client_alive_timeouts = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 84 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 85 | /* |
| 86 | * This SIGCHLD kludge is used to detect when the child exits. The server |
| 87 | * will exit after that, as soon as forwarded connections have terminated. |
| 88 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 89 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 90 | static volatile int child_terminated; /* The child has terminated. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 91 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 92 | /* prototypes */ |
| 93 | static void server_init_dispatch(void); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 94 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 95 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 96 | sigchld_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 97 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 98 | int save_errno = errno; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 99 | debug("Received SIGCHLD."); |
| 100 | child_terminated = 1; |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 101 | mysignal(SIGCHLD, sigchld_handler); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 102 | errno = save_errno; |
| 103 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 104 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 105 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 106 | * Make packets from buffered stderr data, and buffer it for sending |
| 107 | * to the client. |
| 108 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 109 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 110 | make_packets_from_stderr_data(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 111 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 112 | int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 113 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 114 | /* Send buffered stderr data to the client. */ |
| 115 | while (buffer_len(&stderr_buffer) > 0 && |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 116 | packet_not_very_much_data_to_write()) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 117 | len = buffer_len(&stderr_buffer); |
| 118 | if (packet_is_interactive()) { |
| 119 | if (len > 512) |
| 120 | len = 512; |
| 121 | } else { |
| 122 | /* Keep the packets at reasonable size. */ |
| 123 | if (len > packet_get_maxsize()) |
| 124 | len = packet_get_maxsize(); |
| 125 | } |
| 126 | packet_start(SSH_SMSG_STDERR_DATA); |
| 127 | packet_put_string(buffer_ptr(&stderr_buffer), len); |
| 128 | packet_send(); |
| 129 | buffer_consume(&stderr_buffer, len); |
| 130 | stderr_bytes += len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 131 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 132 | } |
| 133 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 134 | /* |
| 135 | * Make packets from buffered stdout data, and buffer it for sending to the |
| 136 | * client. |
| 137 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 138 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 139 | make_packets_from_stdout_data(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 140 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 141 | int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 142 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 143 | /* Send buffered stdout data to the client. */ |
| 144 | while (buffer_len(&stdout_buffer) > 0 && |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 145 | packet_not_very_much_data_to_write()) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 146 | len = buffer_len(&stdout_buffer); |
| 147 | if (packet_is_interactive()) { |
| 148 | if (len > 512) |
| 149 | len = 512; |
| 150 | } else { |
| 151 | /* Keep the packets at reasonable size. */ |
| 152 | if (len > packet_get_maxsize()) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 153 | len = packet_get_maxsize(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 154 | } |
| 155 | packet_start(SSH_SMSG_STDOUT_DATA); |
| 156 | packet_put_string(buffer_ptr(&stdout_buffer), len); |
| 157 | packet_send(); |
| 158 | buffer_consume(&stdout_buffer, len); |
| 159 | stdout_bytes += len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 160 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 161 | } |
| 162 | |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 163 | static void |
| 164 | client_alive_check(void) |
| 165 | { |
| 166 | int id; |
| 167 | |
| 168 | /* timeout, check to see how many we have had */ |
| 169 | if (++client_alive_timeouts > options.client_alive_count_max) |
| 170 | packet_disconnect("Timeout, your session not responding."); |
| 171 | |
| 172 | id = channel_find_open(); |
| 173 | if (id == -1) |
| 174 | packet_disconnect("No open channels after timeout!"); |
| 175 | /* |
| 176 | * send a bogus channel request with "wantreply", |
| 177 | * we should get back a failure |
| 178 | */ |
| 179 | channel_request_start(id, "keepalive@openssh.com", 1); |
| 180 | packet_send(); |
| 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 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 189 | static 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, |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 191 | int *nallocp, 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 | */ |
Ben Lindstrom | 36857f6 | 2001-07-18 15:48:57 +0000 | [diff] [blame] | 205 | if (compat20 && |
| 206 | max_time_milliseconds == 0 && options.client_alive_interval) { |
Ben Lindstrom | 2f0304c | 2001-04-29 19:49:14 +0000 | [diff] [blame] | 207 | client_alive_scheduled = 1; |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 208 | max_time_milliseconds = options.client_alive_interval * 1000; |
Ben Lindstrom | 36857f6 | 2001-07-18 15:48:57 +0000 | [diff] [blame] | 209 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 210 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 211 | /* Allocate and update select() masks for channel descriptors. */ |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 212 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, 0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 213 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 214 | if (compat20) { |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 215 | #if 0 |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 216 | /* wrong: bad condition XXX */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 217 | if (channel_not_very_much_buffered_data()) |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 218 | #endif |
| 219 | FD_SET(connection_in, *readsetp); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 220 | } else { |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 221 | /* |
| 222 | * Read packets from the client unless we have too much |
| 223 | * buffered stdin or channel data. |
| 224 | */ |
| 225 | if (buffer_len(&stdin_buffer) < buffer_high && |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 226 | channel_not_very_much_buffered_data()) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 227 | FD_SET(connection_in, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 228 | /* |
| 229 | * If there is not too much data already buffered going to |
| 230 | * the client, try to get some more data from the program. |
| 231 | */ |
| 232 | if (packet_not_very_much_data_to_write()) { |
| 233 | if (!fdout_eof) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 234 | FD_SET(fdout, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 235 | if (!fderr_eof) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 236 | FD_SET(fderr, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 237 | } |
| 238 | /* |
| 239 | * If we have buffered data, try to write some of that data |
| 240 | * to the program. |
| 241 | */ |
| 242 | if (fdin != -1 && buffer_len(&stdin_buffer) > 0) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 243 | FD_SET(fdin, *writesetp); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 244 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 245 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 246 | /* |
| 247 | * If we have buffered packet data going to the client, mark that |
| 248 | * descriptor. |
| 249 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 250 | if (packet_have_data_to_write()) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 251 | FD_SET(connection_out, *writesetp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 252 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 253 | /* |
| 254 | * If child has terminated and there is enough buffer space to read |
| 255 | * from it, then read as much as is available and exit. |
| 256 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 257 | if (child_terminated && packet_not_very_much_data_to_write()) |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 258 | if (max_time_milliseconds == 0 || client_alive_scheduled) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 259 | max_time_milliseconds = 100; |
| 260 | |
| 261 | if (max_time_milliseconds == 0) |
| 262 | tvp = NULL; |
| 263 | else { |
| 264 | tv.tv_sec = max_time_milliseconds / 1000; |
| 265 | tv.tv_usec = 1000 * (max_time_milliseconds % 1000); |
| 266 | tvp = &tv; |
| 267 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 268 | if (tvp!=NULL) |
Ben Lindstrom | f4c7311 | 2001-03-05 05:58:23 +0000 | [diff] [blame] | 269 | debug3("tvp!=NULL kid %d mili %d", child_terminated, max_time_milliseconds); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 270 | |
| 271 | /* Wait for something to happen, or the timeout to expire. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 272 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 273 | |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 274 | if (ret == -1) { |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 275 | memset(*readsetp, 0, *maxfdp); |
| 276 | memset(*writesetp, 0, *maxfdp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 277 | if (errno != EINTR) |
| 278 | error("select: %.100s", strerror(errno)); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 279 | } else if (ret == 0 && client_alive_scheduled) |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 280 | client_alive_check(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 281 | } |
| 282 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 283 | /* |
| 284 | * Processes input from the client and the program. Input data is stored |
| 285 | * in buffers and processed later. |
| 286 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 287 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 288 | process_input(fd_set * readset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 289 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 290 | int len; |
| 291 | char buf[16384]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 292 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 293 | /* Read and buffer any input data from the client. */ |
| 294 | if (FD_ISSET(connection_in, readset)) { |
| 295 | len = read(connection_in, buf, sizeof(buf)); |
| 296 | if (len == 0) { |
| 297 | verbose("Connection closed by remote host."); |
Ben Lindstrom | e34ab4c | 2001-04-07 01:12:11 +0000 | [diff] [blame] | 298 | connection_closed = 1; |
| 299 | if (compat20) |
| 300 | return; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 301 | fatal_cleanup(); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 302 | } else if (len < 0) { |
| 303 | if (errno != EINTR && errno != EAGAIN) { |
| 304 | verbose("Read error from remote host: %.100s", strerror(errno)); |
| 305 | fatal_cleanup(); |
| 306 | } |
| 307 | } else { |
| 308 | /* Buffer any received data. */ |
| 309 | packet_process_incoming(buf, len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 310 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 311 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 312 | if (compat20) |
| 313 | return; |
| 314 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 315 | /* Read and buffer any available stdout data from the program. */ |
| 316 | if (!fdout_eof && FD_ISSET(fdout, readset)) { |
| 317 | len = read(fdout, buf, sizeof(buf)); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 318 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { |
| 319 | /* do nothing */ |
| 320 | } else if (len <= 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 321 | fdout_eof = 1; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 322 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 323 | buffer_append(&stdout_buffer, buf, len); |
| 324 | fdout_bytes += len; |
| 325 | } |
| 326 | } |
| 327 | /* Read and buffer any available stderr data from the program. */ |
| 328 | if (!fderr_eof && FD_ISSET(fderr, readset)) { |
| 329 | len = read(fderr, buf, sizeof(buf)); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 330 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { |
| 331 | /* do nothing */ |
| 332 | } else if (len <= 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 333 | fderr_eof = 1; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 334 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 335 | buffer_append(&stderr_buffer, buf, len); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 336 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 337 | } |
| 338 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 339 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 340 | /* |
| 341 | * Sends data from internal buffers to client program stdin. |
| 342 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 343 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 344 | process_output(fd_set * writeset) |
| 345 | { |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 346 | struct termios tio; |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 347 | u_char *data; |
| 348 | u_int dlen; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 349 | int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 350 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 351 | /* Write buffered data to program stdin. */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 352 | if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) { |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 353 | data = buffer_ptr(&stdin_buffer); |
| 354 | dlen = buffer_len(&stdin_buffer); |
| 355 | len = write(fdin, data, dlen); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 356 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { |
| 357 | /* do nothing */ |
| 358 | } else if (len <= 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 359 | #ifdef USE_PIPES |
| 360 | close(fdin); |
| 361 | #else |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 362 | if (fdin != fdout) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 363 | close(fdin); |
| 364 | else |
| 365 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ |
| 366 | #endif |
| 367 | fdin = -1; |
| 368 | } else { |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 369 | /* Successful write. */ |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 370 | if (fdin_is_tty && dlen >= 1 && data[0] != '\r' && |
| 371 | tcgetattr(fdin, &tio) == 0 && |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 372 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { |
Kevin Steves | b7f036f | 2001-02-15 17:27:15 +0000 | [diff] [blame] | 373 | /* |
| 374 | * Simulate echo to reduce the impact of |
| 375 | * traffic analysis |
| 376 | */ |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 377 | packet_send_ignore(len); |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 378 | packet_send(); |
| 379 | } |
| 380 | /* Consume the data from the buffer. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 381 | buffer_consume(&stdin_buffer, len); |
| 382 | /* Update the count of bytes written to the program. */ |
| 383 | stdin_bytes += len; |
| 384 | } |
| 385 | } |
| 386 | /* Send any buffered packet data to the client. */ |
| 387 | if (FD_ISSET(connection_out, writeset)) |
| 388 | packet_write_poll(); |
| 389 | } |
| 390 | |
| 391 | /* |
| 392 | * Wait until all buffered output has been sent to the client. |
| 393 | * This is used when the program terminates. |
| 394 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 395 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 396 | drain_output(void) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 397 | { |
| 398 | /* Send any buffered stdout data to the client. */ |
| 399 | if (buffer_len(&stdout_buffer) > 0) { |
| 400 | packet_start(SSH_SMSG_STDOUT_DATA); |
| 401 | packet_put_string(buffer_ptr(&stdout_buffer), |
| 402 | buffer_len(&stdout_buffer)); |
| 403 | packet_send(); |
| 404 | /* Update the count of sent bytes. */ |
| 405 | stdout_bytes += buffer_len(&stdout_buffer); |
| 406 | } |
| 407 | /* Send any buffered stderr data to the client. */ |
| 408 | if (buffer_len(&stderr_buffer) > 0) { |
| 409 | packet_start(SSH_SMSG_STDERR_DATA); |
| 410 | packet_put_string(buffer_ptr(&stderr_buffer), |
| 411 | buffer_len(&stderr_buffer)); |
| 412 | packet_send(); |
| 413 | /* Update the count of sent bytes. */ |
| 414 | stderr_bytes += buffer_len(&stderr_buffer); |
| 415 | } |
| 416 | /* Wait until all buffered data has been written to the client. */ |
| 417 | packet_write_wait(); |
| 418 | } |
| 419 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 420 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 421 | process_buffered_input_packets(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 422 | { |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 423 | dispatch_run(DISPATCH_NONBLOCK, NULL, compat20 ? xxx_kex : NULL); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 424 | } |
| 425 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 426 | /* |
| 427 | * Performs the interactive session. This handles data transmission between |
| 428 | * the client and the program. Note that the notion of stdin, stdout, and |
| 429 | * stderr in this function is sort of reversed: this function writes to |
| 430 | * stdin (of the child program), and reads from stdout and stderr (of the |
| 431 | * child program). |
| 432 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 433 | void |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 434 | 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] | 435 | { |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 436 | fd_set *readset = NULL, *writeset = NULL; |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 437 | int max_fd = 0, nalloc = 0; |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 438 | int wait_status; /* Status returned by wait(). */ |
| 439 | pid_t wait_pid; /* pid returned by wait(). */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 440 | int waiting_termination = 0; /* Have displayed waiting close message. */ |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 441 | u_int max_time_milliseconds; |
| 442 | u_int previous_stdout_buffer_bytes; |
| 443 | u_int stdout_buffer_bytes; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 444 | int type; |
| 445 | |
| 446 | debug("Entering interactive session."); |
| 447 | |
| 448 | /* Initialize the SIGCHLD kludge. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 449 | child_terminated = 0; |
Kevin Steves | e26a155 | 2001-07-26 17:51:49 +0000 | [diff] [blame] | 450 | mysignal(SIGCHLD, sigchld_handler); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 451 | |
| 452 | /* Initialize our global variables. */ |
| 453 | fdin = fdin_arg; |
| 454 | fdout = fdout_arg; |
| 455 | fderr = fderr_arg; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 456 | |
| 457 | /* nonblocking IO */ |
| 458 | set_nonblock(fdin); |
| 459 | set_nonblock(fdout); |
Damien Miller | 7d6656c | 2000-05-20 15:22:36 +1000 | [diff] [blame] | 460 | /* we don't have stderr for interactive terminal sessions, see below */ |
| 461 | if (fderr != -1) |
| 462 | set_nonblock(fderr); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 463 | |
Damien Miller | 225736c | 2001-02-19 21:51:08 +1100 | [diff] [blame] | 464 | if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin)) |
| 465 | fdin_is_tty = 1; |
| 466 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 467 | connection_in = packet_get_connection_in(); |
| 468 | connection_out = packet_get_connection_out(); |
| 469 | |
| 470 | previous_stdout_buffer_bytes = 0; |
| 471 | |
| 472 | /* Set approximate I/O buffer size. */ |
| 473 | if (packet_is_interactive()) |
| 474 | buffer_high = 4096; |
| 475 | else |
| 476 | buffer_high = 64 * 1024; |
| 477 | |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 478 | #if 0 |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 479 | /* Initialize max_fd to the maximum of the known file descriptors. */ |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 480 | max_fd = MAX(connection_in, connection_out); |
| 481 | max_fd = MAX(max_fd, fdin); |
| 482 | max_fd = MAX(max_fd, fdout); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 483 | if (fderr != -1) |
| 484 | max_fd = MAX(max_fd, fderr); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 485 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 486 | |
| 487 | /* Initialize Initialize buffers. */ |
| 488 | buffer_init(&stdin_buffer); |
| 489 | buffer_init(&stdout_buffer); |
| 490 | buffer_init(&stderr_buffer); |
| 491 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 492 | /* |
| 493 | * If we have no separate fderr (which is the case when we have a pty |
| 494 | * - there we cannot make difference between data sent to stdout and |
| 495 | * stderr), indicate that we have seen an EOF from stderr. This way |
| 496 | * we don\'t need to check the descriptor everywhere. |
| 497 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 498 | if (fderr == -1) |
| 499 | fderr_eof = 1; |
| 500 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 501 | server_init_dispatch(); |
| 502 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 503 | /* Main loop of the server for the interactive session mode. */ |
| 504 | for (;;) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 505 | |
| 506 | /* Process buffered packets from the client. */ |
| 507 | process_buffered_input_packets(); |
| 508 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 509 | /* |
| 510 | * If we have received eof, and there is no more pending |
| 511 | * input data, cause a real eof by closing fdin. |
| 512 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 513 | if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) { |
| 514 | #ifdef USE_PIPES |
| 515 | close(fdin); |
| 516 | #else |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 517 | if (fdin != fdout) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 518 | close(fdin); |
| 519 | else |
| 520 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ |
| 521 | #endif |
| 522 | fdin = -1; |
| 523 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 524 | /* Make packets from buffered stderr data to send to the client. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 525 | make_packets_from_stderr_data(); |
| 526 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 527 | /* |
| 528 | * Make packets from buffered stdout data to send to the |
| 529 | * client. If there is very little to send, this arranges to |
| 530 | * not send them now, but to wait a short while to see if we |
| 531 | * are getting more data. This is necessary, as some systems |
| 532 | * wake up readers from a pty after each separate character. |
| 533 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 534 | max_time_milliseconds = 0; |
| 535 | stdout_buffer_bytes = buffer_len(&stdout_buffer); |
| 536 | if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 && |
| 537 | stdout_buffer_bytes != previous_stdout_buffer_bytes) { |
| 538 | /* try again after a while */ |
| 539 | max_time_milliseconds = 10; |
| 540 | } else { |
| 541 | /* Send it now. */ |
| 542 | make_packets_from_stdout_data(); |
| 543 | } |
| 544 | previous_stdout_buffer_bytes = buffer_len(&stdout_buffer); |
| 545 | |
| 546 | /* Send channel data to the client. */ |
| 547 | if (packet_not_very_much_data_to_write()) |
| 548 | channel_output_poll(); |
| 549 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 550 | /* |
| 551 | * Bail out of the loop if the program has closed its output |
| 552 | * descriptors, and we have no more data to send to the |
| 553 | * client, and there is no pending buffered data. |
| 554 | */ |
Damien Miller | 43dc8da | 2000-11-29 15:55:17 +1100 | [diff] [blame] | 555 | if (fdout_eof && fderr_eof && !packet_have_data_to_write() && |
| 556 | buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 557 | if (!channel_still_open()) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 558 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 559 | if (!waiting_termination) { |
| 560 | const char *s = "Waiting for forwarded connections to terminate...\r\n"; |
| 561 | char *cp; |
| 562 | waiting_termination = 1; |
| 563 | buffer_append(&stderr_buffer, s, strlen(s)); |
| 564 | |
| 565 | /* Display list of open channels. */ |
| 566 | cp = channel_open_message(); |
| 567 | buffer_append(&stderr_buffer, cp, strlen(cp)); |
| 568 | xfree(cp); |
| 569 | } |
| 570 | } |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 571 | max_fd = MAX(connection_in, connection_out); |
| 572 | max_fd = MAX(max_fd, fdin); |
| 573 | max_fd = MAX(max_fd, fdout); |
| 574 | max_fd = MAX(max_fd, fderr); |
| 575 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 576 | /* Sleep in select() until we can do something. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 577 | wait_until_can_do_something(&readset, &writeset, &max_fd, |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 578 | &nalloc, max_time_milliseconds); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 579 | |
| 580 | /* Process any channel events. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 581 | channel_after_select(readset, writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 582 | |
| 583 | /* Process input from the client and from program stdout/stderr. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 584 | process_input(readset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 585 | |
| 586 | /* Process output to the client and to program stdin. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 587 | process_output(writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 588 | } |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 589 | if (readset) |
| 590 | xfree(readset); |
| 591 | if (writeset) |
| 592 | xfree(writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 593 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 594 | /* Cleanup and termination code. */ |
| 595 | |
| 596 | /* Wait until all output has been sent to the client. */ |
| 597 | drain_output(); |
| 598 | |
| 599 | debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.", |
| 600 | stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes); |
| 601 | |
| 602 | /* Free and clear the buffers. */ |
| 603 | buffer_free(&stdin_buffer); |
| 604 | buffer_free(&stdout_buffer); |
| 605 | buffer_free(&stderr_buffer); |
| 606 | |
| 607 | /* Close the file descriptors. */ |
| 608 | if (fdout != -1) |
| 609 | close(fdout); |
| 610 | fdout = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 611 | fdout_eof = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 612 | if (fderr != -1) |
| 613 | close(fderr); |
| 614 | fderr = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 615 | fderr_eof = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 616 | if (fdin != -1) |
| 617 | close(fdin); |
| 618 | fdin = -1; |
| 619 | |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 620 | channel_free_all(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 621 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 622 | /* We no longer want our SIGCHLD handler to be called. */ |
Kevin Steves | e26a155 | 2001-07-26 17:51:49 +0000 | [diff] [blame] | 623 | mysignal(SIGCHLD, SIG_DFL); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 624 | |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 625 | wait_pid = waitpid(-1, &wait_status, child_terminated ? WNOHANG : 0); |
| 626 | if (wait_pid == -1) |
| 627 | packet_disconnect("wait: %.100s", strerror(errno)); |
| 628 | else if (wait_pid != pid) |
| 629 | error("Strange, wait returned pid %d, expected %d", |
| 630 | wait_pid, pid); |
| 631 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 632 | /* Check if it exited normally. */ |
| 633 | if (WIFEXITED(wait_status)) { |
| 634 | /* Yes, normal exit. Get exit status and send it to the client. */ |
| 635 | debug("Command exited with status %d.", WEXITSTATUS(wait_status)); |
| 636 | packet_start(SSH_SMSG_EXITSTATUS); |
| 637 | packet_put_int(WEXITSTATUS(wait_status)); |
| 638 | packet_send(); |
| 639 | packet_write_wait(); |
| 640 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 641 | /* |
| 642 | * Wait for exit confirmation. Note that there might be |
| 643 | * other packets coming before it; however, the program has |
| 644 | * already died so we just ignore them. The client is |
| 645 | * supposed to respond with the confirmation when it receives |
| 646 | * the exit status. |
| 647 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 648 | do { |
| 649 | int plen; |
| 650 | type = packet_read(&plen); |
| 651 | } |
| 652 | while (type != SSH_CMSG_EXIT_CONFIRMATION); |
| 653 | |
| 654 | debug("Received exit confirmation."); |
| 655 | return; |
| 656 | } |
| 657 | /* Check if the program terminated due to a signal. */ |
| 658 | if (WIFSIGNALED(wait_status)) |
| 659 | packet_disconnect("Command terminated on signal %d.", |
| 660 | WTERMSIG(wait_status)); |
| 661 | |
| 662 | /* Some weird exit cause. Just exit. */ |
| 663 | packet_disconnect("wait returned status %04x.", wait_status); |
| 664 | /* NOTREACHED */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 665 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 666 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 667 | static void |
| 668 | collect_children(void) |
| 669 | { |
| 670 | pid_t pid; |
| 671 | sigset_t oset, nset; |
| 672 | int status; |
| 673 | |
| 674 | /* block SIGCHLD while we check for dead children */ |
| 675 | sigemptyset(&nset); |
| 676 | sigaddset(&nset, SIGCHLD); |
| 677 | sigprocmask(SIG_BLOCK, &nset, &oset); |
| 678 | if (child_terminated) { |
| 679 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0) |
| 680 | session_close_by_pid(pid, status); |
| 681 | child_terminated = 0; |
| 682 | } |
| 683 | sigprocmask(SIG_SETMASK, &oset, NULL); |
| 684 | } |
| 685 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 686 | void |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 687 | server_loop2(Authctxt *authctxt) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 688 | { |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 689 | fd_set *readset = NULL, *writeset = NULL; |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 690 | int rekeying = 0, max_fd, nalloc = 0; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 691 | |
| 692 | debug("Entering interactive session for SSH2."); |
| 693 | |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 694 | mysignal(SIGCHLD, sigchld_handler); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 695 | child_terminated = 0; |
| 696 | connection_in = packet_get_connection_in(); |
| 697 | connection_out = packet_get_connection_out(); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 698 | |
| 699 | max_fd = MAX(connection_in, connection_out); |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 700 | xxx_authctxt = authctxt; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 701 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 702 | server_init_dispatch(); |
| 703 | |
| 704 | for (;;) { |
| 705 | process_buffered_input_packets(); |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 706 | |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 707 | rekeying = (xxx_kex != NULL && !xxx_kex->done); |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 708 | |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 709 | if (!rekeying && packet_not_very_much_data_to_write()) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 710 | channel_output_poll(); |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 711 | wait_until_can_do_something(&readset, &writeset, &max_fd, |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 712 | &nalloc, 0); |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 713 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 714 | collect_children(); |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 715 | if (!rekeying) |
| 716 | channel_after_select(readset, writeset); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 717 | process_input(readset); |
Ben Lindstrom | e34ab4c | 2001-04-07 01:12:11 +0000 | [diff] [blame] | 718 | if (connection_closed) |
| 719 | break; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 720 | process_output(writeset); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 721 | } |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 722 | collect_children(); |
| 723 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 724 | if (readset) |
| 725 | xfree(readset); |
| 726 | if (writeset) |
| 727 | xfree(writeset); |
| 728 | |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 729 | /* free all channels, no more reads and writes */ |
| 730 | channel_free_all(); |
Ben Lindstrom | 4983d5e | 2001-07-04 05:17:40 +0000 | [diff] [blame] | 731 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 732 | /* free remaining sessions, e.g. remove wtmp entries */ |
| 733 | session_destroy_all(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 734 | } |
| 735 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 736 | static void |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 737 | server_input_channel_failure(int type, int plen, void *ctxt) |
| 738 | { |
| 739 | debug("Got CHANNEL_FAILURE for keepalive"); |
| 740 | /* |
Ben Lindstrom | 2f0304c | 2001-04-29 19:49:14 +0000 | [diff] [blame] | 741 | * reset timeout, since we got a sane answer from the client. |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 742 | * even if this was generated by something other than |
| 743 | * the bogus CHANNEL_REQUEST we send for keepalives. |
| 744 | */ |
| 745 | client_alive_timeouts = 0; |
| 746 | } |
| 747 | |
| 748 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 749 | static void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 750 | server_input_stdin_data(int type, int plen, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 751 | { |
| 752 | char *data; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 753 | u_int data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 754 | |
| 755 | /* Stdin data from the client. Append it to the buffer. */ |
| 756 | /* Ignore any data if the client has closed stdin. */ |
| 757 | if (fdin == -1) |
| 758 | return; |
| 759 | data = packet_get_string(&data_len); |
| 760 | packet_integrity_check(plen, (4 + data_len), type); |
| 761 | buffer_append(&stdin_buffer, data, data_len); |
| 762 | memset(data, 0, data_len); |
| 763 | xfree(data); |
| 764 | } |
| 765 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 766 | static void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 767 | server_input_eof(int type, int plen, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 768 | { |
| 769 | /* |
| 770 | * Eof from the client. The stdin descriptor to the |
| 771 | * program will be closed when all buffered data has |
| 772 | * drained. |
| 773 | */ |
| 774 | debug("EOF received for stdin."); |
| 775 | packet_integrity_check(plen, 0, type); |
| 776 | stdin_eof = 1; |
| 777 | } |
| 778 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 779 | static void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 780 | server_input_window_size(int type, int plen, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 781 | { |
| 782 | int row = packet_get_int(); |
| 783 | int col = packet_get_int(); |
| 784 | int xpixel = packet_get_int(); |
| 785 | int ypixel = packet_get_int(); |
| 786 | |
| 787 | debug("Window change received."); |
| 788 | packet_integrity_check(plen, 4 * 4, type); |
| 789 | if (fdin != -1) |
| 790 | pty_change_window_size(fdin, row, col, xpixel, ypixel); |
| 791 | } |
| 792 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 793 | static Channel * |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 794 | server_request_direct_tcpip(char *ctype) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 795 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 796 | Channel *c; |
| 797 | int sock; |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 798 | char *target, *originator; |
| 799 | int target_port, originator_port; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 800 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 801 | target = packet_get_string(NULL); |
| 802 | target_port = packet_get_int(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 803 | originator = packet_get_string(NULL); |
| 804 | originator_port = packet_get_int(); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 805 | packet_done(); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 806 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 807 | 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] | 808 | originator, originator_port, target, target_port); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 809 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 810 | /* XXX check permission */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 811 | sock = channel_connect_to(target, target_port); |
| 812 | xfree(target); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 813 | xfree(originator); |
| 814 | if (sock < 0) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 815 | return NULL; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 816 | c = channel_new(ctype, SSH_CHANNEL_CONNECTING, |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 817 | sock, sock, -1, CHAN_TCP_WINDOW_DEFAULT, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 818 | CHAN_TCP_PACKET_DEFAULT, 0, xstrdup("direct-tcpip"), 1); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 819 | if (c == NULL) { |
| 820 | error("server_request_direct_tcpip: channel_new failed"); |
| 821 | close(sock); |
| 822 | } |
| 823 | return c; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 824 | } |
| 825 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 826 | static Channel * |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 827 | server_request_session(char *ctype) |
| 828 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 829 | Channel *c; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 830 | |
| 831 | debug("input_session_request"); |
| 832 | packet_done(); |
| 833 | /* |
| 834 | * A server session has no fd to read or write until a |
| 835 | * CHANNEL_REQUEST for a shell is made, so we set the type to |
| 836 | * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all |
| 837 | * CHANNEL_REQUEST messages is registered. |
| 838 | */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 839 | c = channel_new(ctype, SSH_CHANNEL_LARVAL, |
| 840 | -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT, |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 841 | 0, xstrdup("server-session"), 1); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 842 | if (c == NULL) { |
| 843 | error("server_request_session: channel_new failed"); |
| 844 | return NULL; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 845 | } |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 846 | if (session_open(xxx_authctxt, c->self) != 1) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 847 | debug("session open failed, free channel %d", c->self); |
| 848 | channel_free(c); |
| 849 | return NULL; |
| 850 | } |
| 851 | channel_register_callback(c->self, SSH2_MSG_CHANNEL_REQUEST, |
| 852 | session_input_channel_req, (void *)0); |
| 853 | channel_register_cleanup(c->self, session_close_by_channel); |
| 854 | return c; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 855 | } |
| 856 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 857 | static void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 858 | server_input_channel_open(int type, int plen, void *ctxt) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 859 | { |
| 860 | Channel *c = NULL; |
| 861 | char *ctype; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 862 | u_int len; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 863 | int rchan; |
| 864 | int rmaxpack; |
| 865 | int rwindow; |
| 866 | |
| 867 | ctype = packet_get_string(&len); |
| 868 | rchan = packet_get_int(); |
| 869 | rwindow = packet_get_int(); |
| 870 | rmaxpack = packet_get_int(); |
| 871 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 872 | 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] | 873 | ctype, rchan, rwindow, rmaxpack); |
| 874 | |
| 875 | if (strcmp(ctype, "session") == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 876 | c = server_request_session(ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 877 | } else if (strcmp(ctype, "direct-tcpip") == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 878 | c = server_request_direct_tcpip(ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 879 | } |
| 880 | if (c != NULL) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 881 | debug("server_input_channel_open: confirm %s", ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 882 | c->remote_id = rchan; |
| 883 | c->remote_window = rwindow; |
| 884 | c->remote_maxpacket = rmaxpack; |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 885 | if (c->type != SSH_CHANNEL_CONNECTING) { |
| 886 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 887 | packet_put_int(c->remote_id); |
| 888 | packet_put_int(c->self); |
| 889 | packet_put_int(c->local_window); |
| 890 | packet_put_int(c->local_maxpacket); |
| 891 | packet_send(); |
| 892 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 893 | } else { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 894 | debug("server_input_channel_open: failure %s", ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 895 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
| 896 | packet_put_int(rchan); |
| 897 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 898 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 899 | packet_put_cstring("open failed"); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 900 | packet_put_cstring(""); |
| 901 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 902 | packet_send(); |
| 903 | } |
| 904 | xfree(ctype); |
| 905 | } |
| 906 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 907 | static void |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 908 | server_input_global_request(int type, int plen, void *ctxt) |
| 909 | { |
| 910 | char *rtype; |
| 911 | int want_reply; |
| 912 | int success = 0; |
| 913 | |
| 914 | rtype = packet_get_string(NULL); |
| 915 | want_reply = packet_get_char(); |
| 916 | 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] | 917 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 918 | /* -R style forwarding */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 919 | if (strcmp(rtype, "tcpip-forward") == 0) { |
| 920 | struct passwd *pw; |
| 921 | char *listen_address; |
| 922 | u_short listen_port; |
| 923 | |
| 924 | pw = auth_get_user(); |
| 925 | if (pw == NULL) |
| 926 | fatal("server_input_global_request: no user"); |
| 927 | listen_address = packet_get_string(NULL); /* XXX currently ignored */ |
| 928 | listen_port = (u_short)packet_get_int(); |
| 929 | debug("server_input_global_request: tcpip-forward listen %s port %d", |
| 930 | listen_address, listen_port); |
| 931 | |
| 932 | /* check permissions */ |
| 933 | if (!options.allow_tcp_forwarding || |
| 934 | no_port_forwarding_flag || |
| 935 | (listen_port < IPPORT_RESERVED && pw->pw_uid != 0)) { |
| 936 | success = 0; |
| 937 | packet_send_debug("Server has disabled port forwarding."); |
| 938 | } else { |
| 939 | /* Start listening on the port */ |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 940 | success = channel_request_forwarding( |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 941 | listen_address, listen_port, |
| 942 | /*unspec host_to_connect*/ "<unspec host>", |
| 943 | /*unspec port_to_connect*/ 0, |
| 944 | options.gateway_ports, /*remote*/ 1); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 945 | } |
| 946 | xfree(listen_address); |
| 947 | } |
| 948 | if (want_reply) { |
| 949 | packet_start(success ? |
| 950 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); |
| 951 | packet_send(); |
| 952 | packet_write_wait(); |
| 953 | } |
| 954 | xfree(rtype); |
| 955 | } |
| 956 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 957 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 958 | server_init_dispatch_20(void) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 959 | { |
| 960 | debug("server_init_dispatch_20"); |
| 961 | dispatch_init(&dispatch_protocol_error); |
| 962 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
| 963 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); |
| 964 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); |
| 965 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); |
| 966 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open); |
| 967 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 968 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
| 969 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &channel_input_channel_request); |
| 970 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 971 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request); |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 972 | /* client_alive */ |
| 973 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_channel_failure); |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 974 | /* rekeying */ |
| 975 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 976 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 977 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 978 | server_init_dispatch_13(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 979 | { |
| 980 | debug("server_init_dispatch_13"); |
| 981 | dispatch_init(NULL); |
| 982 | dispatch_set(SSH_CMSG_EOF, &server_input_eof); |
| 983 | dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data); |
| 984 | dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size); |
| 985 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); |
| 986 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); |
| 987 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); |
| 988 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 989 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
| 990 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); |
| 991 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 992 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 993 | server_init_dispatch_15(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 994 | { |
| 995 | server_init_dispatch_13(); |
| 996 | debug("server_init_dispatch_15"); |
| 997 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); |
| 998 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose); |
| 999 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1000 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1001 | server_init_dispatch(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1002 | { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1003 | if (compat20) |
| 1004 | server_init_dispatch_20(); |
| 1005 | else if (compat13) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1006 | server_init_dispatch_13(); |
| 1007 | else |
| 1008 | server_init_dispatch_15(); |
| 1009 | } |