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" |
Ben Lindstrom | 3dc40f9 | 2002-03-26 02:01:30 +0000 | [diff] [blame] | 38 | RCSID("$OpenBSD: serverloop.c,v 1.100 2002/03/24 16:00:27 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 | |
Ben Lindstrom | 5e71c54 | 2001-12-06 16:48:14 +0000 | [diff] [blame] | 90 | static volatile sig_atomic_t child_terminated = 0; /* 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 | |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 95 | /* |
| 96 | * we write to this pipe if a SIGCHLD is caught in order to avoid |
| 97 | * the race between select() and child_terminated |
| 98 | */ |
| 99 | static int notify_pipe[2]; |
| 100 | static void |
| 101 | notify_setup(void) |
| 102 | { |
| 103 | if (pipe(notify_pipe) < 0) { |
| 104 | error("pipe(notify_pipe) failed %s", strerror(errno)); |
| 105 | } else if ((fcntl(notify_pipe[0], F_SETFD, 1) == -1) || |
| 106 | (fcntl(notify_pipe[1], F_SETFD, 1) == -1)) { |
| 107 | error("fcntl(notify_pipe, F_SETFD) failed %s", strerror(errno)); |
| 108 | close(notify_pipe[0]); |
| 109 | close(notify_pipe[1]); |
| 110 | } else { |
| 111 | set_nonblock(notify_pipe[0]); |
| 112 | set_nonblock(notify_pipe[1]); |
| 113 | return; |
| 114 | } |
| 115 | notify_pipe[0] = -1; /* read end */ |
| 116 | notify_pipe[1] = -1; /* write end */ |
| 117 | } |
| 118 | static void |
| 119 | notify_parent(void) |
| 120 | { |
| 121 | if (notify_pipe[1] != -1) |
| 122 | write(notify_pipe[1], "", 1); |
| 123 | } |
| 124 | static void |
| 125 | notify_prepare(fd_set *readset) |
| 126 | { |
| 127 | if (notify_pipe[0] != -1) |
| 128 | FD_SET(notify_pipe[0], readset); |
| 129 | } |
| 130 | static void |
| 131 | notify_done(fd_set *readset) |
| 132 | { |
| 133 | char c; |
| 134 | |
| 135 | if (notify_pipe[0] != -1 && FD_ISSET(notify_pipe[0], readset)) |
| 136 | while (read(notify_pipe[0], &c, 1) != -1) |
| 137 | debug2("notify_done: reading"); |
| 138 | } |
| 139 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 140 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 141 | sigchld_handler(int sig) |
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 | int save_errno = errno; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 144 | debug("Received SIGCHLD."); |
| 145 | child_terminated = 1; |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 146 | mysignal(SIGCHLD, sigchld_handler); |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 147 | notify_parent(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 148 | errno = save_errno; |
| 149 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 150 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 151 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 152 | * Make packets from buffered stderr data, and buffer it for sending |
| 153 | * to the client. |
| 154 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 155 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 156 | make_packets_from_stderr_data(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 157 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 158 | int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 159 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 160 | /* Send buffered stderr data to the client. */ |
| 161 | while (buffer_len(&stderr_buffer) > 0 && |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 162 | packet_not_very_much_data_to_write()) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 163 | len = buffer_len(&stderr_buffer); |
| 164 | if (packet_is_interactive()) { |
| 165 | if (len > 512) |
| 166 | len = 512; |
| 167 | } else { |
| 168 | /* Keep the packets at reasonable size. */ |
| 169 | if (len > packet_get_maxsize()) |
| 170 | len = packet_get_maxsize(); |
| 171 | } |
| 172 | packet_start(SSH_SMSG_STDERR_DATA); |
| 173 | packet_put_string(buffer_ptr(&stderr_buffer), len); |
| 174 | packet_send(); |
| 175 | buffer_consume(&stderr_buffer, len); |
| 176 | stderr_bytes += len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 177 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 178 | } |
| 179 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 180 | /* |
| 181 | * Make packets from buffered stdout data, and buffer it for sending to the |
| 182 | * client. |
| 183 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 184 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 185 | make_packets_from_stdout_data(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 186 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 187 | int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 188 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 189 | /* Send buffered stdout data to the client. */ |
| 190 | while (buffer_len(&stdout_buffer) > 0 && |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 191 | packet_not_very_much_data_to_write()) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 192 | len = buffer_len(&stdout_buffer); |
| 193 | if (packet_is_interactive()) { |
| 194 | if (len > 512) |
| 195 | len = 512; |
| 196 | } else { |
| 197 | /* Keep the packets at reasonable size. */ |
| 198 | if (len > packet_get_maxsize()) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 199 | len = packet_get_maxsize(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 200 | } |
| 201 | packet_start(SSH_SMSG_STDOUT_DATA); |
| 202 | packet_put_string(buffer_ptr(&stdout_buffer), len); |
| 203 | packet_send(); |
| 204 | buffer_consume(&stdout_buffer, len); |
| 205 | stdout_bytes += len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 206 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 207 | } |
| 208 | |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 209 | static void |
| 210 | client_alive_check(void) |
| 211 | { |
Damien Miller | 056cf73 | 2002-01-22 23:21:39 +1100 | [diff] [blame] | 212 | static int had_channel = 0; |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 213 | int id; |
| 214 | |
Damien Miller | 056cf73 | 2002-01-22 23:21:39 +1100 | [diff] [blame] | 215 | id = channel_find_open(); |
| 216 | if (id == -1) { |
| 217 | if (!had_channel) |
| 218 | return; |
| 219 | packet_disconnect("No open channels after timeout!"); |
| 220 | } |
| 221 | had_channel = 1; |
| 222 | |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 223 | /* timeout, check to see how many we have had */ |
| 224 | if (++client_alive_timeouts > options.client_alive_count_max) |
| 225 | packet_disconnect("Timeout, your session not responding."); |
| 226 | |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 227 | /* |
| 228 | * send a bogus channel request with "wantreply", |
| 229 | * we should get back a failure |
| 230 | */ |
| 231 | channel_request_start(id, "keepalive@openssh.com", 1); |
| 232 | packet_send(); |
| 233 | } |
| 234 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 235 | /* |
| 236 | * Sleep in select() until we can do something. This will initialize the |
| 237 | * select masks. Upon return, the masks will indicate which descriptors |
| 238 | * have data or can accept data. Optionally, a maximum time can be specified |
| 239 | * for the duration of the wait (0 = infinite). |
| 240 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 241 | static void |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 242 | 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] | 243 | int *nallocp, u_int max_time_milliseconds) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 244 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 245 | struct timeval tv, *tvp; |
| 246 | int ret; |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 247 | int client_alive_scheduled = 0; |
| 248 | |
| 249 | /* |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 250 | * if using client_alive, set the max timeout accordingly, |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 251 | * and indicate that this particular timeout was for client |
| 252 | * alive by setting the client_alive_scheduled flag. |
| 253 | * |
| 254 | * this could be randomized somewhat to make traffic |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 255 | * analysis more difficult, but we're not doing it yet. |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 256 | */ |
Ben Lindstrom | 36857f6 | 2001-07-18 15:48:57 +0000 | [diff] [blame] | 257 | if (compat20 && |
| 258 | max_time_milliseconds == 0 && options.client_alive_interval) { |
Ben Lindstrom | 2f0304c | 2001-04-29 19:49:14 +0000 | [diff] [blame] | 259 | client_alive_scheduled = 1; |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 260 | max_time_milliseconds = options.client_alive_interval * 1000; |
Ben Lindstrom | 36857f6 | 2001-07-18 15:48:57 +0000 | [diff] [blame] | 261 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 262 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 263 | /* Allocate and update select() masks for channel descriptors. */ |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 264 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, 0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 265 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 266 | if (compat20) { |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 267 | #if 0 |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 268 | /* wrong: bad condition XXX */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 269 | if (channel_not_very_much_buffered_data()) |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 270 | #endif |
| 271 | FD_SET(connection_in, *readsetp); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 272 | } else { |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 273 | /* |
| 274 | * Read packets from the client unless we have too much |
| 275 | * buffered stdin or channel data. |
| 276 | */ |
| 277 | if (buffer_len(&stdin_buffer) < buffer_high && |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 278 | channel_not_very_much_buffered_data()) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 279 | FD_SET(connection_in, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 280 | /* |
| 281 | * If there is not too much data already buffered going to |
| 282 | * the client, try to get some more data from the program. |
| 283 | */ |
| 284 | if (packet_not_very_much_data_to_write()) { |
| 285 | if (!fdout_eof) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 286 | FD_SET(fdout, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 287 | if (!fderr_eof) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 288 | FD_SET(fderr, *readsetp); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 289 | } |
| 290 | /* |
| 291 | * If we have buffered data, try to write some of that data |
| 292 | * to the program. |
| 293 | */ |
| 294 | if (fdin != -1 && buffer_len(&stdin_buffer) > 0) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 295 | FD_SET(fdin, *writesetp); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 296 | } |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 297 | notify_prepare(*readsetp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 298 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 299 | /* |
| 300 | * If we have buffered packet data going to the client, mark that |
| 301 | * descriptor. |
| 302 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 303 | if (packet_have_data_to_write()) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 304 | FD_SET(connection_out, *writesetp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 305 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 306 | /* |
| 307 | * If child has terminated and there is enough buffer space to read |
| 308 | * from it, then read as much as is available and exit. |
| 309 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 310 | if (child_terminated && packet_not_very_much_data_to_write()) |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 311 | if (max_time_milliseconds == 0 || client_alive_scheduled) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 312 | max_time_milliseconds = 100; |
| 313 | |
| 314 | if (max_time_milliseconds == 0) |
| 315 | tvp = NULL; |
| 316 | else { |
| 317 | tv.tv_sec = max_time_milliseconds / 1000; |
| 318 | tv.tv_usec = 1000 * (max_time_milliseconds % 1000); |
| 319 | tvp = &tv; |
| 320 | } |
| 321 | |
| 322 | /* Wait for something to happen, or the timeout to expire. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 323 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 324 | |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 325 | if (ret == -1) { |
Damien Miller | 79faeff | 2001-11-12 11:06:32 +1100 | [diff] [blame] | 326 | memset(*readsetp, 0, *nallocp); |
| 327 | memset(*writesetp, 0, *nallocp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 328 | if (errno != EINTR) |
| 329 | error("select: %.100s", strerror(errno)); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 330 | } else if (ret == 0 && client_alive_scheduled) |
Damien Miller | 8c3902a | 2001-10-10 15:01:40 +1000 | [diff] [blame] | 331 | client_alive_check(); |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 332 | |
| 333 | notify_done(*readsetp); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 334 | } |
| 335 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 336 | /* |
| 337 | * Processes input from the client and the program. Input data is stored |
| 338 | * in buffers and processed later. |
| 339 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 340 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 341 | process_input(fd_set * readset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 342 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 343 | int len; |
| 344 | char buf[16384]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 345 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 346 | /* Read and buffer any input data from the client. */ |
| 347 | if (FD_ISSET(connection_in, readset)) { |
| 348 | len = read(connection_in, buf, sizeof(buf)); |
| 349 | if (len == 0) { |
| 350 | verbose("Connection closed by remote host."); |
Ben Lindstrom | e34ab4c | 2001-04-07 01:12:11 +0000 | [diff] [blame] | 351 | connection_closed = 1; |
| 352 | if (compat20) |
| 353 | return; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 354 | fatal_cleanup(); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 355 | } else if (len < 0) { |
| 356 | if (errno != EINTR && errno != EAGAIN) { |
| 357 | verbose("Read error from remote host: %.100s", strerror(errno)); |
| 358 | fatal_cleanup(); |
| 359 | } |
| 360 | } else { |
| 361 | /* Buffer any received data. */ |
| 362 | packet_process_incoming(buf, len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 363 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 364 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 365 | if (compat20) |
| 366 | return; |
| 367 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 368 | /* Read and buffer any available stdout data from the program. */ |
| 369 | if (!fdout_eof && FD_ISSET(fdout, readset)) { |
| 370 | len = read(fdout, buf, sizeof(buf)); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 371 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { |
| 372 | /* do nothing */ |
| 373 | } else if (len <= 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 374 | fdout_eof = 1; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 375 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 376 | buffer_append(&stdout_buffer, buf, len); |
| 377 | fdout_bytes += len; |
| 378 | } |
| 379 | } |
| 380 | /* Read and buffer any available stderr data from the program. */ |
| 381 | if (!fderr_eof && FD_ISSET(fderr, readset)) { |
| 382 | len = read(fderr, buf, sizeof(buf)); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 383 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { |
| 384 | /* do nothing */ |
| 385 | } else if (len <= 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 386 | fderr_eof = 1; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 387 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 388 | buffer_append(&stderr_buffer, buf, len); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 389 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 390 | } |
| 391 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 392 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 393 | /* |
| 394 | * Sends data from internal buffers to client program stdin. |
| 395 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 396 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 397 | process_output(fd_set * writeset) |
| 398 | { |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 399 | struct termios tio; |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 400 | u_char *data; |
| 401 | u_int dlen; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 402 | int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 403 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 404 | /* Write buffered data to program stdin. */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 405 | if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) { |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 406 | data = buffer_ptr(&stdin_buffer); |
| 407 | dlen = buffer_len(&stdin_buffer); |
| 408 | len = write(fdin, data, dlen); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 409 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { |
| 410 | /* do nothing */ |
| 411 | } else if (len <= 0) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 412 | if (fdin != fdout) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 413 | close(fdin); |
| 414 | else |
| 415 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 416 | fdin = -1; |
| 417 | } else { |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 418 | /* Successful write. */ |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 419 | if (fdin_is_tty && dlen >= 1 && data[0] != '\r' && |
| 420 | tcgetattr(fdin, &tio) == 0 && |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 421 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { |
Kevin Steves | b7f036f | 2001-02-15 17:27:15 +0000 | [diff] [blame] | 422 | /* |
| 423 | * Simulate echo to reduce the impact of |
| 424 | * traffic analysis |
| 425 | */ |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 426 | packet_send_ignore(len); |
Ben Lindstrom | aa630de | 2001-02-10 23:44:47 +0000 | [diff] [blame] | 427 | packet_send(); |
| 428 | } |
| 429 | /* Consume the data from the buffer. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 430 | buffer_consume(&stdin_buffer, len); |
| 431 | /* Update the count of bytes written to the program. */ |
| 432 | stdin_bytes += len; |
| 433 | } |
| 434 | } |
| 435 | /* Send any buffered packet data to the client. */ |
| 436 | if (FD_ISSET(connection_out, writeset)) |
| 437 | packet_write_poll(); |
| 438 | } |
| 439 | |
| 440 | /* |
| 441 | * Wait until all buffered output has been sent to the client. |
| 442 | * This is used when the program terminates. |
| 443 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 444 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 445 | drain_output(void) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 446 | { |
| 447 | /* Send any buffered stdout data to the client. */ |
| 448 | if (buffer_len(&stdout_buffer) > 0) { |
| 449 | packet_start(SSH_SMSG_STDOUT_DATA); |
| 450 | packet_put_string(buffer_ptr(&stdout_buffer), |
| 451 | buffer_len(&stdout_buffer)); |
| 452 | packet_send(); |
| 453 | /* Update the count of sent bytes. */ |
| 454 | stdout_bytes += buffer_len(&stdout_buffer); |
| 455 | } |
| 456 | /* Send any buffered stderr data to the client. */ |
| 457 | if (buffer_len(&stderr_buffer) > 0) { |
| 458 | packet_start(SSH_SMSG_STDERR_DATA); |
| 459 | packet_put_string(buffer_ptr(&stderr_buffer), |
| 460 | buffer_len(&stderr_buffer)); |
| 461 | packet_send(); |
| 462 | /* Update the count of sent bytes. */ |
| 463 | stderr_bytes += buffer_len(&stderr_buffer); |
| 464 | } |
| 465 | /* Wait until all buffered data has been written to the client. */ |
| 466 | packet_write_wait(); |
| 467 | } |
| 468 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 469 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 470 | process_buffered_input_packets(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 471 | { |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 472 | dispatch_run(DISPATCH_NONBLOCK, NULL, compat20 ? xxx_kex : NULL); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 473 | } |
| 474 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 475 | /* |
| 476 | * Performs the interactive session. This handles data transmission between |
| 477 | * the client and the program. Note that the notion of stdin, stdout, and |
| 478 | * stderr in this function is sort of reversed: this function writes to |
| 479 | * stdin (of the child program), and reads from stdout and stderr (of the |
| 480 | * child program). |
| 481 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 482 | void |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 483 | 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] | 484 | { |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 485 | fd_set *readset = NULL, *writeset = NULL; |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 486 | int max_fd = 0, nalloc = 0; |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 487 | int wait_status; /* Status returned by wait(). */ |
| 488 | pid_t wait_pid; /* pid returned by wait(). */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 489 | int waiting_termination = 0; /* Have displayed waiting close message. */ |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 490 | u_int max_time_milliseconds; |
| 491 | u_int previous_stdout_buffer_bytes; |
| 492 | u_int stdout_buffer_bytes; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 493 | int type; |
| 494 | |
| 495 | debug("Entering interactive session."); |
| 496 | |
| 497 | /* Initialize the SIGCHLD kludge. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 498 | child_terminated = 0; |
Kevin Steves | e26a155 | 2001-07-26 17:51:49 +0000 | [diff] [blame] | 499 | mysignal(SIGCHLD, sigchld_handler); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 500 | |
| 501 | /* Initialize our global variables. */ |
| 502 | fdin = fdin_arg; |
| 503 | fdout = fdout_arg; |
| 504 | fderr = fderr_arg; |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 505 | |
| 506 | /* nonblocking IO */ |
| 507 | set_nonblock(fdin); |
| 508 | set_nonblock(fdout); |
Damien Miller | 7d6656c | 2000-05-20 15:22:36 +1000 | [diff] [blame] | 509 | /* we don't have stderr for interactive terminal sessions, see below */ |
| 510 | if (fderr != -1) |
| 511 | set_nonblock(fderr); |
Damien Miller | dcb6ecd | 2000-05-17 22:34:22 +1000 | [diff] [blame] | 512 | |
Damien Miller | 225736c | 2001-02-19 21:51:08 +1100 | [diff] [blame] | 513 | if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin)) |
| 514 | fdin_is_tty = 1; |
| 515 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 516 | connection_in = packet_get_connection_in(); |
| 517 | connection_out = packet_get_connection_out(); |
| 518 | |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 519 | notify_setup(); |
| 520 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 521 | previous_stdout_buffer_bytes = 0; |
| 522 | |
| 523 | /* Set approximate I/O buffer size. */ |
| 524 | if (packet_is_interactive()) |
| 525 | buffer_high = 4096; |
| 526 | else |
| 527 | buffer_high = 64 * 1024; |
| 528 | |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 529 | #if 0 |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 530 | /* Initialize max_fd to the maximum of the known file descriptors. */ |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 531 | max_fd = MAX(connection_in, connection_out); |
| 532 | max_fd = MAX(max_fd, fdin); |
| 533 | max_fd = MAX(max_fd, fdout); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 534 | if (fderr != -1) |
| 535 | max_fd = MAX(max_fd, fderr); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 536 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 537 | |
| 538 | /* Initialize Initialize buffers. */ |
| 539 | buffer_init(&stdin_buffer); |
| 540 | buffer_init(&stdout_buffer); |
| 541 | buffer_init(&stderr_buffer); |
| 542 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 543 | /* |
| 544 | * If we have no separate fderr (which is the case when we have a pty |
| 545 | * - there we cannot make difference between data sent to stdout and |
| 546 | * stderr), indicate that we have seen an EOF from stderr. This way |
| 547 | * we don\'t need to check the descriptor everywhere. |
| 548 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 549 | if (fderr == -1) |
| 550 | fderr_eof = 1; |
| 551 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 552 | server_init_dispatch(); |
| 553 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 554 | /* Main loop of the server for the interactive session mode. */ |
| 555 | for (;;) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 556 | |
| 557 | /* Process buffered packets from the client. */ |
| 558 | process_buffered_input_packets(); |
| 559 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 560 | /* |
| 561 | * If we have received eof, and there is no more pending |
| 562 | * input data, cause a real eof by closing fdin. |
| 563 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 564 | if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 565 | if (fdin != fdout) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 566 | close(fdin); |
| 567 | else |
| 568 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 569 | fdin = -1; |
| 570 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 571 | /* Make packets from buffered stderr data to send to the client. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 572 | make_packets_from_stderr_data(); |
| 573 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 574 | /* |
| 575 | * Make packets from buffered stdout data to send to the |
| 576 | * client. If there is very little to send, this arranges to |
| 577 | * not send them now, but to wait a short while to see if we |
| 578 | * are getting more data. This is necessary, as some systems |
| 579 | * wake up readers from a pty after each separate character. |
| 580 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 581 | max_time_milliseconds = 0; |
| 582 | stdout_buffer_bytes = buffer_len(&stdout_buffer); |
| 583 | if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 && |
| 584 | stdout_buffer_bytes != previous_stdout_buffer_bytes) { |
| 585 | /* try again after a while */ |
| 586 | max_time_milliseconds = 10; |
| 587 | } else { |
| 588 | /* Send it now. */ |
| 589 | make_packets_from_stdout_data(); |
| 590 | } |
| 591 | previous_stdout_buffer_bytes = buffer_len(&stdout_buffer); |
| 592 | |
| 593 | /* Send channel data to the client. */ |
| 594 | if (packet_not_very_much_data_to_write()) |
| 595 | channel_output_poll(); |
| 596 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 597 | /* |
| 598 | * Bail out of the loop if the program has closed its output |
| 599 | * descriptors, and we have no more data to send to the |
| 600 | * client, and there is no pending buffered data. |
| 601 | */ |
Damien Miller | 43dc8da | 2000-11-29 15:55:17 +1100 | [diff] [blame] | 602 | if (fdout_eof && fderr_eof && !packet_have_data_to_write() && |
| 603 | buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 604 | if (!channel_still_open()) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 605 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 606 | if (!waiting_termination) { |
| 607 | const char *s = "Waiting for forwarded connections to terminate...\r\n"; |
| 608 | char *cp; |
| 609 | waiting_termination = 1; |
| 610 | buffer_append(&stderr_buffer, s, strlen(s)); |
| 611 | |
| 612 | /* Display list of open channels. */ |
| 613 | cp = channel_open_message(); |
| 614 | buffer_append(&stderr_buffer, cp, strlen(cp)); |
| 615 | xfree(cp); |
| 616 | } |
| 617 | } |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 618 | max_fd = MAX(connection_in, connection_out); |
| 619 | max_fd = MAX(max_fd, fdin); |
| 620 | max_fd = MAX(max_fd, fdout); |
| 621 | max_fd = MAX(max_fd, fderr); |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 622 | max_fd = MAX(max_fd, notify_pipe[0]); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 623 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 624 | /* Sleep in select() until we can do something. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 625 | wait_until_can_do_something(&readset, &writeset, &max_fd, |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 626 | &nalloc, max_time_milliseconds); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 627 | |
| 628 | /* Process any channel events. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 629 | channel_after_select(readset, writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 630 | |
| 631 | /* Process input from the client and from program stdout/stderr. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 632 | process_input(readset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 633 | |
| 634 | /* Process output to the client and to program stdin. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 635 | process_output(writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 636 | } |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 637 | if (readset) |
| 638 | xfree(readset); |
| 639 | if (writeset) |
| 640 | xfree(writeset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 641 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 642 | /* Cleanup and termination code. */ |
| 643 | |
| 644 | /* Wait until all output has been sent to the client. */ |
| 645 | drain_output(); |
| 646 | |
| 647 | debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 648 | stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 649 | |
| 650 | /* Free and clear the buffers. */ |
| 651 | buffer_free(&stdin_buffer); |
| 652 | buffer_free(&stdout_buffer); |
| 653 | buffer_free(&stderr_buffer); |
| 654 | |
| 655 | /* Close the file descriptors. */ |
| 656 | if (fdout != -1) |
| 657 | close(fdout); |
| 658 | fdout = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 659 | fdout_eof = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 660 | if (fderr != -1) |
| 661 | close(fderr); |
| 662 | fderr = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 663 | fderr_eof = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 664 | if (fdin != -1) |
| 665 | close(fdin); |
| 666 | fdin = -1; |
| 667 | |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 668 | channel_free_all(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 669 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 670 | /* We no longer want our SIGCHLD handler to be called. */ |
Kevin Steves | e26a155 | 2001-07-26 17:51:49 +0000 | [diff] [blame] | 671 | mysignal(SIGCHLD, SIG_DFL); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 672 | |
Damien Miller | 664d6b9 | 2002-02-05 12:20:16 +1100 | [diff] [blame] | 673 | wait_pid = waitpid(-1, &wait_status, 0); |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 674 | if (wait_pid == -1) |
| 675 | packet_disconnect("wait: %.100s", strerror(errno)); |
| 676 | else if (wait_pid != pid) |
| 677 | error("Strange, wait returned pid %d, expected %d", |
| 678 | wait_pid, pid); |
| 679 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 680 | /* Check if it exited normally. */ |
| 681 | if (WIFEXITED(wait_status)) { |
| 682 | /* Yes, normal exit. Get exit status and send it to the client. */ |
| 683 | debug("Command exited with status %d.", WEXITSTATUS(wait_status)); |
| 684 | packet_start(SSH_SMSG_EXITSTATUS); |
| 685 | packet_put_int(WEXITSTATUS(wait_status)); |
| 686 | packet_send(); |
| 687 | packet_write_wait(); |
| 688 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 689 | /* |
| 690 | * Wait for exit confirmation. Note that there might be |
| 691 | * other packets coming before it; however, the program has |
| 692 | * already died so we just ignore them. The client is |
| 693 | * supposed to respond with the confirmation when it receives |
| 694 | * the exit status. |
| 695 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 696 | do { |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 697 | type = packet_read(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 698 | } |
| 699 | while (type != SSH_CMSG_EXIT_CONFIRMATION); |
| 700 | |
| 701 | debug("Received exit confirmation."); |
| 702 | return; |
| 703 | } |
| 704 | /* Check if the program terminated due to a signal. */ |
| 705 | if (WIFSIGNALED(wait_status)) |
| 706 | packet_disconnect("Command terminated on signal %d.", |
| 707 | WTERMSIG(wait_status)); |
| 708 | |
| 709 | /* Some weird exit cause. Just exit. */ |
| 710 | packet_disconnect("wait returned status %04x.", wait_status); |
| 711 | /* NOTREACHED */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 712 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 713 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 714 | static void |
| 715 | collect_children(void) |
| 716 | { |
| 717 | pid_t pid; |
| 718 | sigset_t oset, nset; |
| 719 | int status; |
| 720 | |
| 721 | /* block SIGCHLD while we check for dead children */ |
| 722 | sigemptyset(&nset); |
| 723 | sigaddset(&nset, SIGCHLD); |
| 724 | sigprocmask(SIG_BLOCK, &nset, &oset); |
| 725 | if (child_terminated) { |
| 726 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0) |
| 727 | session_close_by_pid(pid, status); |
| 728 | child_terminated = 0; |
| 729 | } |
| 730 | sigprocmask(SIG_SETMASK, &oset, NULL); |
| 731 | } |
| 732 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 733 | void |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 734 | server_loop2(Authctxt *authctxt) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 735 | { |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 736 | fd_set *readset = NULL, *writeset = NULL; |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 737 | int rekeying = 0, max_fd, nalloc = 0; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 738 | |
| 739 | debug("Entering interactive session for SSH2."); |
| 740 | |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 741 | mysignal(SIGCHLD, sigchld_handler); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 742 | child_terminated = 0; |
| 743 | connection_in = packet_get_connection_in(); |
| 744 | connection_out = packet_get_connection_out(); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 745 | |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 746 | notify_setup(); |
| 747 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 748 | max_fd = MAX(connection_in, connection_out); |
Damien Miller | f6681a3 | 2001-12-21 14:53:11 +1100 | [diff] [blame] | 749 | max_fd = MAX(max_fd, notify_pipe[0]); |
| 750 | |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 751 | xxx_authctxt = authctxt; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 752 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 753 | server_init_dispatch(); |
| 754 | |
| 755 | for (;;) { |
| 756 | process_buffered_input_packets(); |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 757 | |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 758 | rekeying = (xxx_kex != NULL && !xxx_kex->done); |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 759 | |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 760 | if (!rekeying && packet_not_very_much_data_to_write()) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 761 | channel_output_poll(); |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 762 | wait_until_can_do_something(&readset, &writeset, &max_fd, |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 763 | &nalloc, 0); |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 764 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 765 | collect_children(); |
Ben Lindstrom | 8e312f3 | 2001-04-04 23:50:21 +0000 | [diff] [blame] | 766 | if (!rekeying) |
| 767 | channel_after_select(readset, writeset); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 768 | process_input(readset); |
Ben Lindstrom | e34ab4c | 2001-04-07 01:12:11 +0000 | [diff] [blame] | 769 | if (connection_closed) |
| 770 | break; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 771 | process_output(writeset); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 772 | } |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 773 | collect_children(); |
| 774 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 775 | if (readset) |
| 776 | xfree(readset); |
| 777 | if (writeset) |
| 778 | xfree(writeset); |
| 779 | |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 780 | /* free all channels, no more reads and writes */ |
| 781 | channel_free_all(); |
Ben Lindstrom | 4983d5e | 2001-07-04 05:17:40 +0000 | [diff] [blame] | 782 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 783 | /* free remaining sessions, e.g. remove wtmp entries */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 784 | session_destroy_all(NULL); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 785 | } |
| 786 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 787 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 788 | server_input_channel_failure(int type, u_int32_t seq, void *ctxt) |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 789 | { |
| 790 | debug("Got CHANNEL_FAILURE for keepalive"); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 791 | /* |
Ben Lindstrom | 2f0304c | 2001-04-29 19:49:14 +0000 | [diff] [blame] | 792 | * reset timeout, since we got a sane answer from the client. |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 793 | * even if this was generated by something other than |
| 794 | * the bogus CHANNEL_REQUEST we send for keepalives. |
| 795 | */ |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 796 | client_alive_timeouts = 0; |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 797 | } |
| 798 | |
| 799 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 800 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 801 | server_input_stdin_data(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 802 | { |
| 803 | char *data; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 804 | u_int data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 805 | |
| 806 | /* Stdin data from the client. Append it to the buffer. */ |
| 807 | /* Ignore any data if the client has closed stdin. */ |
| 808 | if (fdin == -1) |
| 809 | return; |
| 810 | data = packet_get_string(&data_len); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 811 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 812 | buffer_append(&stdin_buffer, data, data_len); |
| 813 | memset(data, 0, data_len); |
| 814 | xfree(data); |
| 815 | } |
| 816 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 817 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 818 | server_input_eof(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 819 | { |
| 820 | /* |
| 821 | * Eof from the client. The stdin descriptor to the |
| 822 | * program will be closed when all buffered data has |
| 823 | * drained. |
| 824 | */ |
| 825 | debug("EOF received for stdin."); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 826 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 827 | stdin_eof = 1; |
| 828 | } |
| 829 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 830 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 831 | server_input_window_size(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 832 | { |
| 833 | int row = packet_get_int(); |
| 834 | int col = packet_get_int(); |
| 835 | int xpixel = packet_get_int(); |
| 836 | int ypixel = packet_get_int(); |
| 837 | |
| 838 | debug("Window change received."); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 839 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 840 | if (fdin != -1) |
| 841 | pty_change_window_size(fdin, row, col, xpixel, ypixel); |
| 842 | } |
| 843 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 844 | static Channel * |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 845 | server_request_direct_tcpip(char *ctype) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 846 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 847 | Channel *c; |
| 848 | int sock; |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 849 | char *target, *originator; |
| 850 | int target_port, originator_port; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 851 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 852 | target = packet_get_string(NULL); |
| 853 | target_port = packet_get_int(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 854 | originator = packet_get_string(NULL); |
| 855 | originator_port = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 856 | packet_check_eom(); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 857 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 858 | 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] | 859 | originator, originator_port, target, target_port); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 860 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 861 | /* XXX check permission */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 862 | sock = channel_connect_to(target, target_port); |
| 863 | xfree(target); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 864 | xfree(originator); |
| 865 | if (sock < 0) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 866 | return NULL; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 867 | c = channel_new(ctype, SSH_CHANNEL_CONNECTING, |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 868 | sock, sock, -1, CHAN_TCP_WINDOW_DEFAULT, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 869 | CHAN_TCP_PACKET_DEFAULT, 0, xstrdup("direct-tcpip"), 1); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 870 | return c; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 871 | } |
| 872 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 873 | static Channel * |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 874 | server_request_session(char *ctype) |
| 875 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 876 | Channel *c; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 877 | |
| 878 | debug("input_session_request"); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 879 | packet_check_eom(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 880 | /* |
| 881 | * A server session has no fd to read or write until a |
| 882 | * CHANNEL_REQUEST for a shell is made, so we set the type to |
| 883 | * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all |
| 884 | * CHANNEL_REQUEST messages is registered. |
| 885 | */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 886 | c = channel_new(ctype, SSH_CHANNEL_LARVAL, |
| 887 | -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT, |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 888 | 0, xstrdup("server-session"), 1); |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 889 | if (session_open(xxx_authctxt, c->self) != 1) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 890 | debug("session open failed, free channel %d", c->self); |
| 891 | channel_free(c); |
| 892 | return NULL; |
| 893 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 894 | channel_register_cleanup(c->self, session_close_by_channel); |
| 895 | return c; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 896 | } |
| 897 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 898 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 899 | server_input_channel_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 900 | { |
| 901 | Channel *c = NULL; |
| 902 | char *ctype; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 903 | u_int len; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 904 | int rchan; |
| 905 | int rmaxpack; |
| 906 | int rwindow; |
| 907 | |
| 908 | ctype = packet_get_string(&len); |
| 909 | rchan = packet_get_int(); |
| 910 | rwindow = packet_get_int(); |
| 911 | rmaxpack = packet_get_int(); |
| 912 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 913 | 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] | 914 | ctype, rchan, rwindow, rmaxpack); |
| 915 | |
| 916 | if (strcmp(ctype, "session") == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 917 | c = server_request_session(ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 918 | } else if (strcmp(ctype, "direct-tcpip") == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 919 | c = server_request_direct_tcpip(ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 920 | } |
| 921 | if (c != NULL) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 922 | debug("server_input_channel_open: confirm %s", ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 923 | c->remote_id = rchan; |
| 924 | c->remote_window = rwindow; |
| 925 | c->remote_maxpacket = rmaxpack; |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 926 | if (c->type != SSH_CHANNEL_CONNECTING) { |
| 927 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 928 | packet_put_int(c->remote_id); |
| 929 | packet_put_int(c->self); |
| 930 | packet_put_int(c->local_window); |
| 931 | packet_put_int(c->local_maxpacket); |
| 932 | packet_send(); |
| 933 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 934 | } else { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 935 | debug("server_input_channel_open: failure %s", ctype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 936 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
| 937 | packet_put_int(rchan); |
| 938 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 939 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 940 | packet_put_cstring("open failed"); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 941 | packet_put_cstring(""); |
| 942 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 943 | packet_send(); |
| 944 | } |
| 945 | xfree(ctype); |
| 946 | } |
| 947 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 948 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 949 | server_input_global_request(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 950 | { |
| 951 | char *rtype; |
| 952 | int want_reply; |
| 953 | int success = 0; |
| 954 | |
| 955 | rtype = packet_get_string(NULL); |
| 956 | want_reply = packet_get_char(); |
| 957 | 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] | 958 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 959 | /* -R style forwarding */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 960 | if (strcmp(rtype, "tcpip-forward") == 0) { |
| 961 | struct passwd *pw; |
| 962 | char *listen_address; |
| 963 | u_short listen_port; |
| 964 | |
| 965 | pw = auth_get_user(); |
| 966 | if (pw == NULL) |
| 967 | fatal("server_input_global_request: no user"); |
| 968 | listen_address = packet_get_string(NULL); /* XXX currently ignored */ |
| 969 | listen_port = (u_short)packet_get_int(); |
| 970 | debug("server_input_global_request: tcpip-forward listen %s port %d", |
| 971 | listen_address, listen_port); |
| 972 | |
| 973 | /* check permissions */ |
| 974 | if (!options.allow_tcp_forwarding || |
| 975 | no_port_forwarding_flag || |
| 976 | (listen_port < IPPORT_RESERVED && pw->pw_uid != 0)) { |
| 977 | success = 0; |
| 978 | packet_send_debug("Server has disabled port forwarding."); |
| 979 | } else { |
| 980 | /* Start listening on the port */ |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 981 | success = channel_setup_remote_fwd_listener( |
| 982 | listen_address, listen_port, options.gateway_ports); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 983 | } |
| 984 | xfree(listen_address); |
| 985 | } |
| 986 | if (want_reply) { |
| 987 | packet_start(success ? |
| 988 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); |
| 989 | packet_send(); |
| 990 | packet_write_wait(); |
| 991 | } |
| 992 | xfree(rtype); |
| 993 | } |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 994 | static void |
| 995 | server_input_channel_req(int type, u_int32_t seq, void *ctxt) |
| 996 | { |
| 997 | Channel *c; |
| 998 | int id, reply, success = 0; |
| 999 | char *rtype; |
| 1000 | |
| 1001 | id = packet_get_int(); |
| 1002 | rtype = packet_get_string(NULL); |
| 1003 | reply = packet_get_char(); |
| 1004 | |
| 1005 | debug("server_input_channel_req: channel %d request %s reply %d", |
| 1006 | id, rtype, reply); |
| 1007 | |
| 1008 | if ((c = channel_lookup(id)) == NULL) |
| 1009 | packet_disconnect("server_input_channel_req: " |
| 1010 | "unknown channel %d", id); |
| 1011 | if (c->type == SSH_CHANNEL_LARVAL || c->type == SSH_CHANNEL_OPEN) |
| 1012 | success = session_input_channel_req(c, rtype); |
| 1013 | if (reply) { |
| 1014 | packet_start(success ? |
| 1015 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); |
| 1016 | packet_put_int(c->remote_id); |
| 1017 | packet_send(); |
| 1018 | } |
| 1019 | xfree(rtype); |
| 1020 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1021 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1022 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1023 | server_init_dispatch_20(void) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1024 | { |
| 1025 | debug("server_init_dispatch_20"); |
| 1026 | dispatch_init(&dispatch_protocol_error); |
| 1027 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
| 1028 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); |
| 1029 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); |
| 1030 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); |
| 1031 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open); |
| 1032 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 1033 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1034 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &server_input_channel_req); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1035 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1036 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request); |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 1037 | /* client_alive */ |
| 1038 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_channel_failure); |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 1039 | /* rekeying */ |
| 1040 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1041 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1042 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1043 | server_init_dispatch_13(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1044 | { |
| 1045 | debug("server_init_dispatch_13"); |
| 1046 | dispatch_init(NULL); |
| 1047 | dispatch_set(SSH_CMSG_EOF, &server_input_eof); |
| 1048 | dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data); |
| 1049 | dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size); |
| 1050 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); |
| 1051 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); |
| 1052 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); |
| 1053 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 1054 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
| 1055 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); |
| 1056 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1057 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1058 | server_init_dispatch_15(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1059 | { |
| 1060 | server_init_dispatch_13(); |
| 1061 | debug("server_init_dispatch_15"); |
| 1062 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); |
| 1063 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose); |
| 1064 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1065 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1066 | server_init_dispatch(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1067 | { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1068 | if (compat20) |
| 1069 | server_init_dispatch_20(); |
| 1070 | else if (compat13) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1071 | server_init_dispatch_13(); |
| 1072 | else |
| 1073 | server_init_dispatch_15(); |
| 1074 | } |