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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5260325f | 5 | * Server main loop for handling the interactive session. |
bcbf86ec | 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 | * | |
e78a59f5 | 13 | * SSH2 support by Markus Friedl. |
a96070d4 | 14 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 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. | |
e78a59f5 | 35 | */ |
8efc0c15 | 36 | |
37 | #include "includes.h" | |
1d3e026f | 38 | RCSID("$OpenBSD: serverloop.c,v 1.125 2006/02/07 01:42:00 stevesk Exp $"); |
39 | ||
40 | #include <termios.h> | |
a22aff1f | 41 | |
8efc0c15 | 42 | #include "xmalloc.h" |
8efc0c15 | 43 | #include "packet.h" |
44 | #include "buffer.h" | |
42f11eb2 | 45 | #include "log.h" |
8efc0c15 | 46 | #include "servconf.h" |
00e842d8 | 47 | #include "canohost.h" |
1729c161 | 48 | #include "sshpty.h" |
a5efa1bb | 49 | #include "channels.h" |
7368a6c8 | 50 | #include "compat.h" |
42f11eb2 | 51 | #include "ssh1.h" |
e78a59f5 | 52 | #include "ssh2.h" |
59c97189 | 53 | #include "auth.h" |
e78a59f5 | 54 | #include "session.h" |
7368a6c8 | 55 | #include "dispatch.h" |
38c295d6 | 56 | #include "auth-options.h" |
42f11eb2 | 57 | #include "serverloop.h" |
58 | #include "misc.h" | |
7a37c112 | 59 | #include "kex.h" |
8efc0c15 | 60 | |
33de75a3 | 61 | extern ServerOptions options; |
62 | ||
7a37c112 | 63 | /* XXX */ |
64 | extern Kex *xxx_kex; | |
2362db19 | 65 | extern Authctxt *the_authctxt; |
0bbbf2a4 | 66 | extern int use_privsep; |
7a37c112 | 67 | |
8efc0c15 | 68 | static Buffer stdin_buffer; /* Buffer for stdin data. */ |
69 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
70 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
71 | static int fdin; /* Descriptor for stdin (for writing) */ | |
72 | static int fdout; /* Descriptor for stdout (for reading); | |
73 | May be same number as fdin. */ | |
74 | static int fderr; /* Descriptor for stderr. May be -1. */ | |
75 | static long stdin_bytes = 0; /* Number of bytes written to stdin. */ | |
76 | static long stdout_bytes = 0; /* Number of stdout bytes sent to client. */ | |
77 | static long stderr_bytes = 0; /* Number of stderr bytes sent to client. */ | |
78 | static long fdout_bytes = 0; /* Number of stdout bytes read from program. */ | |
79 | static int stdin_eof = 0; /* EOF message received from client. */ | |
80 | static int fdout_eof = 0; /* EOF encountered reading from fdout. */ | |
81 | static int fderr_eof = 0; /* EOF encountered readung from fderr. */ | |
e68225b2 | 82 | static int fdin_is_tty = 0; /* fdin points to a tty. */ |
8efc0c15 | 83 | static int connection_in; /* Connection to client (input). */ |
84 | static int connection_out; /* Connection to client (output). */ | |
cc94bd38 | 85 | static int connection_closed = 0; /* Connection to client closed. */ |
86 | static u_int buffer_high; /* "Soft" max buffer size. */ | |
72176c0e | 87 | static int client_alive_timeouts = 0; |
8efc0c15 | 88 | |
aa3378df | 89 | /* |
90 | * This SIGCHLD kludge is used to detect when the child exits. The server | |
91 | * will exit after that, as soon as forwarded connections have terminated. | |
92 | */ | |
396c147e | 93 | |
7a934d1b | 94 | static volatile sig_atomic_t child_terminated = 0; /* The child has terminated. */ |
8efc0c15 | 95 | |
0bbbf2a4 | 96 | /* Cleanup on signals (!use_privsep case only) */ |
97 | static volatile sig_atomic_t received_sigterm = 0; | |
98 | ||
396c147e | 99 | /* prototypes */ |
100 | static void server_init_dispatch(void); | |
7368a6c8 | 101 | |
a10be357 | 102 | /* |
103 | * we write to this pipe if a SIGCHLD is caught in order to avoid | |
104 | * the race between select() and child_terminated | |
105 | */ | |
106 | static int notify_pipe[2]; | |
107 | static void | |
108 | notify_setup(void) | |
109 | { | |
110 | if (pipe(notify_pipe) < 0) { | |
111 | error("pipe(notify_pipe) failed %s", strerror(errno)); | |
112 | } else if ((fcntl(notify_pipe[0], F_SETFD, 1) == -1) || | |
113 | (fcntl(notify_pipe[1], F_SETFD, 1) == -1)) { | |
114 | error("fcntl(notify_pipe, F_SETFD) failed %s", strerror(errno)); | |
115 | close(notify_pipe[0]); | |
116 | close(notify_pipe[1]); | |
117 | } else { | |
118 | set_nonblock(notify_pipe[0]); | |
119 | set_nonblock(notify_pipe[1]); | |
120 | return; | |
121 | } | |
122 | notify_pipe[0] = -1; /* read end */ | |
123 | notify_pipe[1] = -1; /* write end */ | |
124 | } | |
125 | static void | |
126 | notify_parent(void) | |
127 | { | |
128 | if (notify_pipe[1] != -1) | |
129 | write(notify_pipe[1], "", 1); | |
130 | } | |
131 | static void | |
132 | notify_prepare(fd_set *readset) | |
133 | { | |
134 | if (notify_pipe[0] != -1) | |
135 | FD_SET(notify_pipe[0], readset); | |
136 | } | |
137 | static void | |
138 | notify_done(fd_set *readset) | |
139 | { | |
140 | char c; | |
141 | ||
142 | if (notify_pipe[0] != -1 && FD_ISSET(notify_pipe[0], readset)) | |
143 | while (read(notify_pipe[0], &c, 1) != -1) | |
144 | debug2("notify_done: reading"); | |
145 | } | |
146 | ||
396c147e | 147 | static void |
5260325f | 148 | sigchld_handler(int sig) |
e78a59f5 | 149 | { |
150 | int save_errno = errno; | |
151 | debug("Received SIGCHLD."); | |
152 | child_terminated = 1; | |
ef51930f | 153 | #ifndef _UNICOS |
c9130033 | 154 | mysignal(SIGCHLD, sigchld_handler); |
ef51930f | 155 | #endif |
a10be357 | 156 | notify_parent(); |
e78a59f5 | 157 | errno = save_errno; |
158 | } | |
8efc0c15 | 159 | |
0bbbf2a4 | 160 | static void |
161 | sigterm_handler(int sig) | |
162 | { | |
163 | received_sigterm = sig; | |
164 | } | |
165 | ||
5260325f | 166 | /* |
167 | * Make packets from buffered stderr data, and buffer it for sending | |
168 | * to the client. | |
169 | */ | |
396c147e | 170 | static void |
5ca51e19 | 171 | make_packets_from_stderr_data(void) |
8efc0c15 | 172 | { |
a27002e5 | 173 | u_int len; |
5260325f | 174 | |
175 | /* Send buffered stderr data to the client. */ | |
176 | while (buffer_len(&stderr_buffer) > 0 && | |
a408af76 | 177 | packet_not_very_much_data_to_write()) { |
5260325f | 178 | len = buffer_len(&stderr_buffer); |
179 | if (packet_is_interactive()) { | |
180 | if (len > 512) | |
181 | len = 512; | |
182 | } else { | |
183 | /* Keep the packets at reasonable size. */ | |
184 | if (len > packet_get_maxsize()) | |
185 | len = packet_get_maxsize(); | |
186 | } | |
187 | packet_start(SSH_SMSG_STDERR_DATA); | |
188 | packet_put_string(buffer_ptr(&stderr_buffer), len); | |
189 | packet_send(); | |
190 | buffer_consume(&stderr_buffer, len); | |
191 | stderr_bytes += len; | |
8efc0c15 | 192 | } |
8efc0c15 | 193 | } |
194 | ||
5260325f | 195 | /* |
196 | * Make packets from buffered stdout data, and buffer it for sending to the | |
197 | * client. | |
198 | */ | |
396c147e | 199 | static void |
5ca51e19 | 200 | make_packets_from_stdout_data(void) |
8efc0c15 | 201 | { |
a27002e5 | 202 | u_int len; |
5260325f | 203 | |
204 | /* Send buffered stdout data to the client. */ | |
205 | while (buffer_len(&stdout_buffer) > 0 && | |
a408af76 | 206 | packet_not_very_much_data_to_write()) { |
5260325f | 207 | len = buffer_len(&stdout_buffer); |
208 | if (packet_is_interactive()) { | |
209 | if (len > 512) | |
210 | len = 512; | |
211 | } else { | |
212 | /* Keep the packets at reasonable size. */ | |
213 | if (len > packet_get_maxsize()) | |
2b87da3b | 214 | len = packet_get_maxsize(); |
5260325f | 215 | } |
216 | packet_start(SSH_SMSG_STDOUT_DATA); | |
217 | packet_put_string(buffer_ptr(&stdout_buffer), len); | |
218 | packet_send(); | |
219 | buffer_consume(&stdout_buffer, len); | |
220 | stdout_bytes += len; | |
8efc0c15 | 221 | } |
8efc0c15 | 222 | } |
223 | ||
72176c0e | 224 | static void |
225 | client_alive_check(void) | |
226 | { | |
95ae2076 | 227 | int channel_id; |
99416ceb | 228 | |
72176c0e | 229 | /* timeout, check to see how many we have had */ |
230 | if (++client_alive_timeouts > options.client_alive_count_max) | |
231 | packet_disconnect("Timeout, your session not responding."); | |
232 | ||
72176c0e | 233 | /* |
95ae2076 | 234 | * send a bogus global/channel request with "wantreply", |
72176c0e | 235 | * we should get back a failure |
236 | */ | |
95ae2076 | 237 | if ((channel_id = channel_find_open()) == -1) { |
238 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
239 | packet_put_cstring("keepalive@openssh.com"); | |
240 | packet_put_char(1); /* boolean: want reply */ | |
241 | } else { | |
242 | channel_request_start(channel_id, "keepalive@openssh.com", 1); | |
243 | } | |
72176c0e | 244 | packet_send(); |
245 | } | |
246 | ||
5260325f | 247 | /* |
248 | * Sleep in select() until we can do something. This will initialize the | |
249 | * select masks. Upon return, the masks will indicate which descriptors | |
250 | * have data or can accept data. Optionally, a maximum time can be specified | |
251 | * for the duration of the wait (0 = infinite). | |
252 | */ | |
396c147e | 253 | static void |
39929cdb | 254 | wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 255 | u_int *nallocp, u_int max_time_milliseconds) |
8efc0c15 | 256 | { |
5260325f | 257 | struct timeval tv, *tvp; |
258 | int ret; | |
3ffc6336 | 259 | int client_alive_scheduled = 0; |
260 | ||
261 | /* | |
184eed6a | 262 | * if using client_alive, set the max timeout accordingly, |
3ffc6336 | 263 | * and indicate that this particular timeout was for client |
264 | * alive by setting the client_alive_scheduled flag. | |
265 | * | |
266 | * this could be randomized somewhat to make traffic | |
184eed6a | 267 | * analysis more difficult, but we're not doing it yet. |
3ffc6336 | 268 | */ |
2c5b1791 | 269 | if (compat20 && |
270 | max_time_milliseconds == 0 && options.client_alive_interval) { | |
39aefe7b | 271 | client_alive_scheduled = 1; |
3ffc6336 | 272 | max_time_milliseconds = options.client_alive_interval * 1000; |
2c5b1791 | 273 | } |
8efc0c15 | 274 | |
39929cdb | 275 | /* Allocate and update select() masks for channel descriptors. */ |
489aa2e9 | 276 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, 0); |
5260325f | 277 | |
e78a59f5 | 278 | if (compat20) { |
0c139bd1 | 279 | #if 0 |
1d1ffb87 | 280 | /* wrong: bad condition XXX */ |
e78a59f5 | 281 | if (channel_not_very_much_buffered_data()) |
0c139bd1 | 282 | #endif |
283 | FD_SET(connection_in, *readsetp); | |
e78a59f5 | 284 | } else { |
71276795 | 285 | /* |
286 | * Read packets from the client unless we have too much | |
287 | * buffered stdin or channel data. | |
288 | */ | |
289 | if (buffer_len(&stdin_buffer) < buffer_high && | |
e78a59f5 | 290 | channel_not_very_much_buffered_data()) |
39929cdb | 291 | FD_SET(connection_in, *readsetp); |
71276795 | 292 | /* |
293 | * If there is not too much data already buffered going to | |
294 | * the client, try to get some more data from the program. | |
295 | */ | |
296 | if (packet_not_very_much_data_to_write()) { | |
297 | if (!fdout_eof) | |
39929cdb | 298 | FD_SET(fdout, *readsetp); |
71276795 | 299 | if (!fderr_eof) |
39929cdb | 300 | FD_SET(fderr, *readsetp); |
71276795 | 301 | } |
302 | /* | |
303 | * If we have buffered data, try to write some of that data | |
304 | * to the program. | |
305 | */ | |
306 | if (fdin != -1 && buffer_len(&stdin_buffer) > 0) | |
39929cdb | 307 | FD_SET(fdin, *writesetp); |
e78a59f5 | 308 | } |
a10be357 | 309 | notify_prepare(*readsetp); |
5260325f | 310 | |
aa3378df | 311 | /* |
312 | * If we have buffered packet data going to the client, mark that | |
313 | * descriptor. | |
314 | */ | |
5260325f | 315 | if (packet_have_data_to_write()) |
39929cdb | 316 | FD_SET(connection_out, *writesetp); |
5260325f | 317 | |
aa3378df | 318 | /* |
319 | * If child has terminated and there is enough buffer space to read | |
320 | * from it, then read as much as is available and exit. | |
321 | */ | |
5260325f | 322 | if (child_terminated && packet_not_very_much_data_to_write()) |
3ffc6336 | 323 | if (max_time_milliseconds == 0 || client_alive_scheduled) |
5260325f | 324 | max_time_milliseconds = 100; |
325 | ||
326 | if (max_time_milliseconds == 0) | |
327 | tvp = NULL; | |
328 | else { | |
329 | tv.tv_sec = max_time_milliseconds / 1000; | |
330 | tv.tv_usec = 1000 * (max_time_milliseconds % 1000); | |
331 | tvp = &tv; | |
332 | } | |
8efc0c15 | 333 | |
5260325f | 334 | /* Wait for something to happen, or the timeout to expire. */ |
39929cdb | 335 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); |
8efc0c15 | 336 | |
3ffc6336 | 337 | if (ret == -1) { |
b3ad8fe6 | 338 | memset(*readsetp, 0, *nallocp); |
339 | memset(*writesetp, 0, *nallocp); | |
5260325f | 340 | if (errno != EINTR) |
341 | error("select: %.100s", strerror(errno)); | |
418e724c | 342 | } else if (ret == 0 && client_alive_scheduled) |
72176c0e | 343 | client_alive_check(); |
a10be357 | 344 | |
345 | notify_done(*readsetp); | |
8efc0c15 | 346 | } |
347 | ||
5260325f | 348 | /* |
349 | * Processes input from the client and the program. Input data is stored | |
350 | * in buffers and processed later. | |
351 | */ | |
396c147e | 352 | static void |
5260325f | 353 | process_input(fd_set * readset) |
354 | { | |
355 | int len; | |
356 | char buf[16384]; | |
357 | ||
358 | /* Read and buffer any input data from the client. */ | |
359 | if (FD_ISSET(connection_in, readset)) { | |
360 | len = read(connection_in, buf, sizeof(buf)); | |
361 | if (len == 0) { | |
00e842d8 | 362 | verbose("Connection closed by %.100s", |
363 | get_remote_ipaddr()); | |
cc94bd38 | 364 | connection_closed = 1; |
365 | if (compat20) | |
366 | return; | |
2362db19 | 367 | cleanup_exit(255); |
0e73cc53 | 368 | } else if (len < 0) { |
369 | if (errno != EINTR && errno != EAGAIN) { | |
00e842d8 | 370 | verbose("Read error from remote host " |
371 | "%.100s: %.100s", | |
372 | get_remote_ipaddr(), strerror(errno)); | |
2362db19 | 373 | cleanup_exit(255); |
0e73cc53 | 374 | } |
375 | } else { | |
376 | /* Buffer any received data. */ | |
377 | packet_process_incoming(buf, len); | |
5260325f | 378 | } |
5260325f | 379 | } |
e78a59f5 | 380 | if (compat20) |
381 | return; | |
382 | ||
5260325f | 383 | /* Read and buffer any available stdout data from the program. */ |
384 | if (!fdout_eof && FD_ISSET(fdout, readset)) { | |
385 | len = read(fdout, buf, sizeof(buf)); | |
0e73cc53 | 386 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { |
387 | /* do nothing */ | |
388 | } else if (len <= 0) { | |
5260325f | 389 | fdout_eof = 1; |
0e73cc53 | 390 | } else { |
5260325f | 391 | buffer_append(&stdout_buffer, buf, len); |
392 | fdout_bytes += len; | |
393 | } | |
394 | } | |
395 | /* Read and buffer any available stderr data from the program. */ | |
396 | if (!fderr_eof && FD_ISSET(fderr, readset)) { | |
397 | len = read(fderr, buf, sizeof(buf)); | |
0e73cc53 | 398 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { |
399 | /* do nothing */ | |
400 | } else if (len <= 0) { | |
5260325f | 401 | fderr_eof = 1; |
0e73cc53 | 402 | } else { |
5260325f | 403 | buffer_append(&stderr_buffer, buf, len); |
0e73cc53 | 404 | } |
5260325f | 405 | } |
406 | } | |
8efc0c15 | 407 | |
5260325f | 408 | /* |
409 | * Sends data from internal buffers to client program stdin. | |
410 | */ | |
396c147e | 411 | static void |
5260325f | 412 | process_output(fd_set * writeset) |
8efc0c15 | 413 | { |
4ef922e3 | 414 | struct termios tio; |
780a9951 | 415 | u_char *data; |
416 | u_int dlen; | |
5260325f | 417 | int len; |
418 | ||
419 | /* Write buffered data to program stdin. */ | |
e78a59f5 | 420 | if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) { |
780a9951 | 421 | data = buffer_ptr(&stdin_buffer); |
422 | dlen = buffer_len(&stdin_buffer); | |
423 | len = write(fdin, data, dlen); | |
0e73cc53 | 424 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { |
425 | /* do nothing */ | |
426 | } else if (len <= 0) { | |
7368a6c8 | 427 | if (fdin != fdout) |
5260325f | 428 | close(fdin); |
429 | else | |
430 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ | |
5260325f | 431 | fdin = -1; |
432 | } else { | |
4ef922e3 | 433 | /* Successful write. */ |
780a9951 | 434 | if (fdin_is_tty && dlen >= 1 && data[0] != '\r' && |
435 | tcgetattr(fdin, &tio) == 0 && | |
0ae4fe1d | 436 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { |
62da27dd | 437 | /* |
438 | * Simulate echo to reduce the impact of | |
439 | * traffic analysis | |
440 | */ | |
95ce5599 | 441 | packet_send_ignore(len); |
4ef922e3 | 442 | packet_send(); |
443 | } | |
444 | /* Consume the data from the buffer. */ | |
5260325f | 445 | buffer_consume(&stdin_buffer, len); |
446 | /* Update the count of bytes written to the program. */ | |
447 | stdin_bytes += len; | |
448 | } | |
8efc0c15 | 449 | } |
5260325f | 450 | /* Send any buffered packet data to the client. */ |
451 | if (FD_ISSET(connection_out, writeset)) | |
452 | packet_write_poll(); | |
8efc0c15 | 453 | } |
454 | ||
5260325f | 455 | /* |
456 | * Wait until all buffered output has been sent to the client. | |
457 | * This is used when the program terminates. | |
458 | */ | |
396c147e | 459 | static void |
5ca51e19 | 460 | drain_output(void) |
8efc0c15 | 461 | { |
5260325f | 462 | /* Send any buffered stdout data to the client. */ |
463 | if (buffer_len(&stdout_buffer) > 0) { | |
464 | packet_start(SSH_SMSG_STDOUT_DATA); | |
465 | packet_put_string(buffer_ptr(&stdout_buffer), | |
466 | buffer_len(&stdout_buffer)); | |
467 | packet_send(); | |
468 | /* Update the count of sent bytes. */ | |
469 | stdout_bytes += buffer_len(&stdout_buffer); | |
470 | } | |
471 | /* Send any buffered stderr data to the client. */ | |
472 | if (buffer_len(&stderr_buffer) > 0) { | |
473 | packet_start(SSH_SMSG_STDERR_DATA); | |
474 | packet_put_string(buffer_ptr(&stderr_buffer), | |
475 | buffer_len(&stderr_buffer)); | |
476 | packet_send(); | |
477 | /* Update the count of sent bytes. */ | |
478 | stderr_bytes += buffer_len(&stderr_buffer); | |
479 | } | |
480 | /* Wait until all buffered data has been written to the client. */ | |
481 | packet_write_wait(); | |
8efc0c15 | 482 | } |
483 | ||
396c147e | 484 | static void |
5ca51e19 | 485 | process_buffered_input_packets(void) |
7368a6c8 | 486 | { |
7a37c112 | 487 | dispatch_run(DISPATCH_NONBLOCK, NULL, compat20 ? xxx_kex : NULL); |
7368a6c8 | 488 | } |
489 | ||
5260325f | 490 | /* |
491 | * Performs the interactive session. This handles data transmission between | |
492 | * the client and the program. Note that the notion of stdin, stdout, and | |
493 | * stderr in this function is sort of reversed: this function writes to | |
494 | * stdin (of the child program), and reads from stdout and stderr (of the | |
495 | * child program). | |
496 | */ | |
6ae2364d | 497 | void |
9da5c3c9 | 498 | server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg) |
8efc0c15 | 499 | { |
39929cdb | 500 | fd_set *readset = NULL, *writeset = NULL; |
9a995072 | 501 | int max_fd = 0; |
502 | u_int nalloc = 0; | |
9da5c3c9 | 503 | int wait_status; /* Status returned by wait(). */ |
504 | pid_t wait_pid; /* pid returned by wait(). */ | |
5260325f | 505 | int waiting_termination = 0; /* Have displayed waiting close message. */ |
1e3b8b07 | 506 | u_int max_time_milliseconds; |
507 | u_int previous_stdout_buffer_bytes; | |
508 | u_int stdout_buffer_bytes; | |
5260325f | 509 | int type; |
510 | ||
511 | debug("Entering interactive session."); | |
512 | ||
513 | /* Initialize the SIGCHLD kludge. */ | |
5260325f | 514 | child_terminated = 0; |
42ad0eec | 515 | mysignal(SIGCHLD, sigchld_handler); |
5260325f | 516 | |
0bbbf2a4 | 517 | if (!use_privsep) { |
518 | signal(SIGTERM, sigterm_handler); | |
519 | signal(SIGINT, sigterm_handler); | |
520 | signal(SIGQUIT, sigterm_handler); | |
521 | } | |
522 | ||
5260325f | 523 | /* Initialize our global variables. */ |
524 | fdin = fdin_arg; | |
525 | fdout = fdout_arg; | |
526 | fderr = fderr_arg; | |
0e73cc53 | 527 | |
528 | /* nonblocking IO */ | |
529 | set_nonblock(fdin); | |
530 | set_nonblock(fdout); | |
ff873e98 | 531 | /* we don't have stderr for interactive terminal sessions, see below */ |
532 | if (fderr != -1) | |
533 | set_nonblock(fderr); | |
0e73cc53 | 534 | |
e68225b2 | 535 | if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin)) |
536 | fdin_is_tty = 1; | |
537 | ||
5260325f | 538 | connection_in = packet_get_connection_in(); |
539 | connection_out = packet_get_connection_out(); | |
540 | ||
a10be357 | 541 | notify_setup(); |
542 | ||
5260325f | 543 | previous_stdout_buffer_bytes = 0; |
544 | ||
545 | /* Set approximate I/O buffer size. */ | |
546 | if (packet_is_interactive()) | |
547 | buffer_high = 4096; | |
548 | else | |
549 | buffer_high = 64 * 1024; | |
550 | ||
489aa2e9 | 551 | #if 0 |
5260325f | 552 | /* Initialize max_fd to the maximum of the known file descriptors. */ |
489aa2e9 | 553 | max_fd = MAX(connection_in, connection_out); |
554 | max_fd = MAX(max_fd, fdin); | |
555 | max_fd = MAX(max_fd, fdout); | |
39929cdb | 556 | if (fderr != -1) |
557 | max_fd = MAX(max_fd, fderr); | |
489aa2e9 | 558 | #endif |
5260325f | 559 | |
560 | /* Initialize Initialize buffers. */ | |
561 | buffer_init(&stdin_buffer); | |
562 | buffer_init(&stdout_buffer); | |
563 | buffer_init(&stderr_buffer); | |
564 | ||
aa3378df | 565 | /* |
566 | * If we have no separate fderr (which is the case when we have a pty | |
567 | * - there we cannot make difference between data sent to stdout and | |
568 | * stderr), indicate that we have seen an EOF from stderr. This way | |
7b9b0103 | 569 | * we don't need to check the descriptor everywhere. |
aa3378df | 570 | */ |
5260325f | 571 | if (fderr == -1) |
572 | fderr_eof = 1; | |
573 | ||
7368a6c8 | 574 | server_init_dispatch(); |
575 | ||
5260325f | 576 | /* Main loop of the server for the interactive session mode. */ |
577 | for (;;) { | |
5260325f | 578 | |
579 | /* Process buffered packets from the client. */ | |
580 | process_buffered_input_packets(); | |
581 | ||
aa3378df | 582 | /* |
583 | * If we have received eof, and there is no more pending | |
584 | * input data, cause a real eof by closing fdin. | |
585 | */ | |
5260325f | 586 | if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) { |
7368a6c8 | 587 | if (fdin != fdout) |
5260325f | 588 | close(fdin); |
589 | else | |
590 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ | |
5260325f | 591 | fdin = -1; |
592 | } | |
aa3378df | 593 | /* Make packets from buffered stderr data to send to the client. */ |
5260325f | 594 | make_packets_from_stderr_data(); |
595 | ||
aa3378df | 596 | /* |
597 | * Make packets from buffered stdout data to send to the | |
598 | * client. If there is very little to send, this arranges to | |
599 | * not send them now, but to wait a short while to see if we | |
600 | * are getting more data. This is necessary, as some systems | |
601 | * wake up readers from a pty after each separate character. | |
602 | */ | |
5260325f | 603 | max_time_milliseconds = 0; |
604 | stdout_buffer_bytes = buffer_len(&stdout_buffer); | |
605 | if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 && | |
606 | stdout_buffer_bytes != previous_stdout_buffer_bytes) { | |
607 | /* try again after a while */ | |
608 | max_time_milliseconds = 10; | |
609 | } else { | |
610 | /* Send it now. */ | |
611 | make_packets_from_stdout_data(); | |
612 | } | |
613 | previous_stdout_buffer_bytes = buffer_len(&stdout_buffer); | |
614 | ||
615 | /* Send channel data to the client. */ | |
616 | if (packet_not_very_much_data_to_write()) | |
617 | channel_output_poll(); | |
618 | ||
aa3378df | 619 | /* |
620 | * Bail out of the loop if the program has closed its output | |
621 | * descriptors, and we have no more data to send to the | |
622 | * client, and there is no pending buffered data. | |
623 | */ | |
7062c40f | 624 | if (fdout_eof && fderr_eof && !packet_have_data_to_write() && |
625 | buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) { | |
5260325f | 626 | if (!channel_still_open()) |
7368a6c8 | 627 | break; |
5260325f | 628 | if (!waiting_termination) { |
629 | const char *s = "Waiting for forwarded connections to terminate...\r\n"; | |
630 | char *cp; | |
631 | waiting_termination = 1; | |
632 | buffer_append(&stderr_buffer, s, strlen(s)); | |
633 | ||
634 | /* Display list of open channels. */ | |
635 | cp = channel_open_message(); | |
636 | buffer_append(&stderr_buffer, cp, strlen(cp)); | |
637 | xfree(cp); | |
638 | } | |
639 | } | |
489aa2e9 | 640 | max_fd = MAX(connection_in, connection_out); |
641 | max_fd = MAX(max_fd, fdin); | |
642 | max_fd = MAX(max_fd, fdout); | |
643 | max_fd = MAX(max_fd, fderr); | |
a10be357 | 644 | max_fd = MAX(max_fd, notify_pipe[0]); |
489aa2e9 | 645 | |
5260325f | 646 | /* Sleep in select() until we can do something. */ |
39929cdb | 647 | wait_until_can_do_something(&readset, &writeset, &max_fd, |
489aa2e9 | 648 | &nalloc, max_time_milliseconds); |
5260325f | 649 | |
0bbbf2a4 | 650 | if (received_sigterm) { |
651 | logit("Exiting on signal %d", received_sigterm); | |
652 | /* Clean up sessions, utmp, etc. */ | |
653 | cleanup_exit(255); | |
654 | } | |
655 | ||
5260325f | 656 | /* Process any channel events. */ |
39929cdb | 657 | channel_after_select(readset, writeset); |
5260325f | 658 | |
659 | /* Process input from the client and from program stdout/stderr. */ | |
39929cdb | 660 | process_input(readset); |
5260325f | 661 | |
662 | /* Process output to the client and to program stdin. */ | |
39929cdb | 663 | process_output(writeset); |
8efc0c15 | 664 | } |
39929cdb | 665 | if (readset) |
666 | xfree(readset); | |
667 | if (writeset) | |
668 | xfree(writeset); | |
8efc0c15 | 669 | |
5260325f | 670 | /* Cleanup and termination code. */ |
8efc0c15 | 671 | |
5260325f | 672 | /* Wait until all output has been sent to the client. */ |
673 | drain_output(); | |
8efc0c15 | 674 | |
5260325f | 675 | debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.", |
184eed6a | 676 | stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes); |
8efc0c15 | 677 | |
5260325f | 678 | /* Free and clear the buffers. */ |
679 | buffer_free(&stdin_buffer); | |
680 | buffer_free(&stdout_buffer); | |
681 | buffer_free(&stderr_buffer); | |
8efc0c15 | 682 | |
5260325f | 683 | /* Close the file descriptors. */ |
684 | if (fdout != -1) | |
685 | close(fdout); | |
686 | fdout = -1; | |
687 | fdout_eof = 1; | |
688 | if (fderr != -1) | |
689 | close(fderr); | |
690 | fderr = -1; | |
691 | fderr_eof = 1; | |
692 | if (fdin != -1) | |
693 | close(fdin); | |
694 | fdin = -1; | |
695 | ||
d6746a0b | 696 | channel_free_all(); |
5260325f | 697 | |
5260325f | 698 | /* We no longer want our SIGCHLD handler to be called. */ |
42ad0eec | 699 | mysignal(SIGCHLD, SIG_DFL); |
5260325f | 700 | |
8c38e88b | 701 | while ((wait_pid = waitpid(-1, &wait_status, 0)) < 0) |
702 | if (errno != EINTR) | |
703 | packet_disconnect("wait: %.100s", strerror(errno)); | |
704 | if (wait_pid != pid) | |
c457707e | 705 | error("Strange, wait returned pid %ld, expected %ld", |
706 | (long)wait_pid, (long)pid); | |
c9130033 | 707 | |
5260325f | 708 | /* Check if it exited normally. */ |
709 | if (WIFEXITED(wait_status)) { | |
710 | /* Yes, normal exit. Get exit status and send it to the client. */ | |
711 | debug("Command exited with status %d.", WEXITSTATUS(wait_status)); | |
712 | packet_start(SSH_SMSG_EXITSTATUS); | |
713 | packet_put_int(WEXITSTATUS(wait_status)); | |
714 | packet_send(); | |
715 | packet_write_wait(); | |
716 | ||
aa3378df | 717 | /* |
718 | * Wait for exit confirmation. Note that there might be | |
719 | * other packets coming before it; however, the program has | |
720 | * already died so we just ignore them. The client is | |
721 | * supposed to respond with the confirmation when it receives | |
722 | * the exit status. | |
723 | */ | |
5260325f | 724 | do { |
54a5250f | 725 | type = packet_read(); |
5260325f | 726 | } |
727 | while (type != SSH_CMSG_EXIT_CONFIRMATION); | |
728 | ||
729 | debug("Received exit confirmation."); | |
730 | return; | |
731 | } | |
732 | /* Check if the program terminated due to a signal. */ | |
733 | if (WIFSIGNALED(wait_status)) | |
734 | packet_disconnect("Command terminated on signal %d.", | |
735 | WTERMSIG(wait_status)); | |
736 | ||
737 | /* Some weird exit cause. Just exit. */ | |
738 | packet_disconnect("wait returned status %04x.", wait_status); | |
739 | /* NOTREACHED */ | |
740 | } | |
7368a6c8 | 741 | |
418e724c | 742 | static void |
743 | collect_children(void) | |
744 | { | |
745 | pid_t pid; | |
746 | sigset_t oset, nset; | |
747 | int status; | |
748 | ||
749 | /* block SIGCHLD while we check for dead children */ | |
750 | sigemptyset(&nset); | |
751 | sigaddset(&nset, SIGCHLD); | |
752 | sigprocmask(SIG_BLOCK, &nset, &oset); | |
753 | if (child_terminated) { | |
8c38e88b | 754 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || |
755 | (pid < 0 && errno == EINTR)) | |
756 | if (pid > 0) | |
757 | session_close_by_pid(pid, status); | |
418e724c | 758 | child_terminated = 0; |
759 | } | |
760 | sigprocmask(SIG_SETMASK, &oset, NULL); | |
761 | } | |
762 | ||
6ae2364d | 763 | void |
57156994 | 764 | server_loop2(Authctxt *authctxt) |
e78a59f5 | 765 | { |
39929cdb | 766 | fd_set *readset = NULL, *writeset = NULL; |
418e724c | 767 | int rekeying = 0, max_fd, nalloc = 0; |
e78a59f5 | 768 | |
769 | debug("Entering interactive session for SSH2."); | |
770 | ||
c9130033 | 771 | mysignal(SIGCHLD, sigchld_handler); |
e78a59f5 | 772 | child_terminated = 0; |
773 | connection_in = packet_get_connection_in(); | |
774 | connection_out = packet_get_connection_out(); | |
39929cdb | 775 | |
0bbbf2a4 | 776 | if (!use_privsep) { |
777 | signal(SIGTERM, sigterm_handler); | |
778 | signal(SIGINT, sigterm_handler); | |
779 | signal(SIGQUIT, sigterm_handler); | |
780 | } | |
781 | ||
a10be357 | 782 | notify_setup(); |
783 | ||
39929cdb | 784 | max_fd = MAX(connection_in, connection_out); |
a10be357 | 785 | max_fd = MAX(max_fd, notify_pipe[0]); |
786 | ||
e78a59f5 | 787 | server_init_dispatch(); |
788 | ||
789 | for (;;) { | |
790 | process_buffered_input_packets(); | |
bbb4cc1b | 791 | |
cd332296 | 792 | rekeying = (xxx_kex != NULL && !xxx_kex->done); |
bbb4cc1b | 793 | |
bbb4cc1b | 794 | if (!rekeying && packet_not_very_much_data_to_write()) |
e78a59f5 | 795 | channel_output_poll(); |
bbb4cc1b | 796 | wait_until_can_do_something(&readset, &writeset, &max_fd, |
489aa2e9 | 797 | &nalloc, 0); |
d5f24f94 | 798 | |
0bbbf2a4 | 799 | if (received_sigterm) { |
800 | logit("Exiting on signal %d", received_sigterm); | |
801 | /* Clean up sessions, utmp, etc. */ | |
802 | cleanup_exit(255); | |
803 | } | |
804 | ||
418e724c | 805 | collect_children(); |
ffd7b36b | 806 | if (!rekeying) { |
bbb4cc1b | 807 | channel_after_select(readset, writeset); |
ffd7b36b | 808 | if (packet_need_rekeying()) { |
809 | debug("need rekeying"); | |
810 | xxx_kex->done = 0; | |
811 | kex_send_kexinit(xxx_kex); | |
812 | } | |
813 | } | |
39929cdb | 814 | process_input(readset); |
cc94bd38 | 815 | if (connection_closed) |
816 | break; | |
39929cdb | 817 | process_output(writeset); |
e78a59f5 | 818 | } |
418e724c | 819 | collect_children(); |
820 | ||
39929cdb | 821 | if (readset) |
822 | xfree(readset); | |
823 | if (writeset) | |
824 | xfree(writeset); | |
825 | ||
d5f24f94 | 826 | /* free all channels, no more reads and writes */ |
827 | channel_free_all(); | |
5b5d170c | 828 | |
418e724c | 829 | /* free remaining sessions, e.g. remove wtmp entries */ |
1853d1ef | 830 | session_destroy_all(NULL); |
e78a59f5 | 831 | } |
832 | ||
396c147e | 833 | static void |
95ae2076 | 834 | server_input_keep_alive(int type, u_int32_t seq, void *ctxt) |
3ffc6336 | 835 | { |
95ae2076 | 836 | debug("Got %d/%u for keepalive", type, seq); |
184eed6a | 837 | /* |
39aefe7b | 838 | * reset timeout, since we got a sane answer from the client. |
3ffc6336 | 839 | * even if this was generated by something other than |
840 | * the bogus CHANNEL_REQUEST we send for keepalives. | |
841 | */ | |
184eed6a | 842 | client_alive_timeouts = 0; |
3ffc6336 | 843 | } |
844 | ||
396c147e | 845 | static void |
7819b5c3 | 846 | server_input_stdin_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 847 | { |
848 | char *data; | |
1e3b8b07 | 849 | u_int data_len; |
7368a6c8 | 850 | |
851 | /* Stdin data from the client. Append it to the buffer. */ | |
852 | /* Ignore any data if the client has closed stdin. */ | |
853 | if (fdin == -1) | |
854 | return; | |
855 | data = packet_get_string(&data_len); | |
95500969 | 856 | packet_check_eom(); |
7368a6c8 | 857 | buffer_append(&stdin_buffer, data, data_len); |
858 | memset(data, 0, data_len); | |
859 | xfree(data); | |
860 | } | |
861 | ||
396c147e | 862 | static void |
7819b5c3 | 863 | server_input_eof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 864 | { |
865 | /* | |
866 | * Eof from the client. The stdin descriptor to the | |
867 | * program will be closed when all buffered data has | |
868 | * drained. | |
869 | */ | |
870 | debug("EOF received for stdin."); | |
95500969 | 871 | packet_check_eom(); |
7368a6c8 | 872 | stdin_eof = 1; |
873 | } | |
874 | ||
396c147e | 875 | static void |
7819b5c3 | 876 | server_input_window_size(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 877 | { |
878 | int row = packet_get_int(); | |
879 | int col = packet_get_int(); | |
880 | int xpixel = packet_get_int(); | |
881 | int ypixel = packet_get_int(); | |
882 | ||
883 | debug("Window change received."); | |
95500969 | 884 | packet_check_eom(); |
7368a6c8 | 885 | if (fdin != -1) |
886 | pty_change_window_size(fdin, row, col, xpixel, ypixel); | |
887 | } | |
888 | ||
396c147e | 889 | static Channel * |
43f7a4b8 | 890 | server_request_direct_tcpip(void) |
e78a59f5 | 891 | { |
719fc62f | 892 | Channel *c; |
893 | int sock; | |
6ae2364d | 894 | char *target, *originator; |
895 | int target_port, originator_port; | |
e78a59f5 | 896 | |
6ae2364d | 897 | target = packet_get_string(NULL); |
898 | target_port = packet_get_int(); | |
e78a59f5 | 899 | originator = packet_get_string(NULL); |
900 | originator_port = packet_get_int(); | |
95500969 | 901 | packet_check_eom(); |
71276795 | 902 | |
fa08c86b | 903 | debug("server_request_direct_tcpip: originator %s port %d, target %s port %d", |
4e2e5cfd | 904 | originator, originator_port, target, target_port); |
38c295d6 | 905 | |
e78a59f5 | 906 | /* XXX check permission */ |
6ae2364d | 907 | sock = channel_connect_to(target, target_port); |
908 | xfree(target); | |
e78a59f5 | 909 | xfree(originator); |
910 | if (sock < 0) | |
fa08c86b | 911 | return NULL; |
43f7a4b8 | 912 | c = channel_new("direct-tcpip", SSH_CHANNEL_CONNECTING, |
bcbf86ec | 913 | sock, sock, -1, CHAN_TCP_WINDOW_DEFAULT, |
0d942eff | 914 | CHAN_TCP_PACKET_DEFAULT, 0, "direct-tcpip", 1); |
719fc62f | 915 | return c; |
fa08c86b | 916 | } |
917 | ||
d20f3c9e | 918 | static Channel * |
919 | server_request_tun(void) | |
920 | { | |
921 | Channel *c = NULL; | |
a4f24bf8 | 922 | int mode, tun; |
923 | int sock; | |
d20f3c9e | 924 | |
a4f24bf8 | 925 | mode = packet_get_int(); |
926 | switch (mode) { | |
927 | case SSH_TUNMODE_POINTOPOINT: | |
928 | case SSH_TUNMODE_ETHERNET: | |
929 | break; | |
930 | default: | |
931 | packet_send_debug("Unsupported tunnel device mode."); | |
932 | return NULL; | |
933 | } | |
934 | if ((options.permit_tun & mode) == 0) { | |
935 | packet_send_debug("Server has rejected tunnel device " | |
936 | "forwarding"); | |
d20f3c9e | 937 | return NULL; |
938 | } | |
939 | ||
940 | tun = packet_get_int(); | |
a2b1748a | 941 | if (forced_tun_device != -1) { |
a4f24bf8 | 942 | if (tun != SSH_TUNID_ANY && forced_tun_device != tun) |
d20f3c9e | 943 | goto done; |
944 | tun = forced_tun_device; | |
945 | } | |
a4f24bf8 | 946 | sock = tun_open(tun, mode); |
d20f3c9e | 947 | if (sock < 0) |
948 | goto done; | |
949 | c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1, | |
950 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); | |
951 | c->datagram = 1; | |
e914f53a | 952 | #if defined(SSH_TUN_FILTER) |
953 | if (mode == SSH_TUNMODE_POINTOPOINT) | |
954 | channel_register_filter(c->self, sys_tun_infilter, | |
955 | sys_tun_outfilter); | |
956 | #endif | |
d20f3c9e | 957 | |
958 | done: | |
959 | if (c == NULL) | |
960 | packet_send_debug("Failed to open the tunnel device."); | |
961 | return c; | |
962 | } | |
963 | ||
396c147e | 964 | static Channel * |
43f7a4b8 | 965 | server_request_session(void) |
fa08c86b | 966 | { |
719fc62f | 967 | Channel *c; |
fa08c86b | 968 | |
969 | debug("input_session_request"); | |
95500969 | 970 | packet_check_eom(); |
fa08c86b | 971 | /* |
972 | * A server session has no fd to read or write until a | |
973 | * CHANNEL_REQUEST for a shell is made, so we set the type to | |
974 | * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all | |
975 | * CHANNEL_REQUEST messages is registered. | |
976 | */ | |
43f7a4b8 | 977 | c = channel_new("session", SSH_CHANNEL_LARVAL, |
719fc62f | 978 | -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT, |
0d942eff | 979 | 0, "server-session", 1); |
2362db19 | 980 | if (session_open(the_authctxt, c->self) != 1) { |
719fc62f | 981 | debug("session open failed, free channel %d", c->self); |
982 | channel_free(c); | |
983 | return NULL; | |
fa08c86b | 984 | } |
8cd0437d | 985 | channel_register_cleanup(c->self, session_close_by_channel, 0); |
719fc62f | 986 | return c; |
e78a59f5 | 987 | } |
988 | ||
396c147e | 989 | static void |
7819b5c3 | 990 | server_input_channel_open(int type, u_int32_t seq, void *ctxt) |
e78a59f5 | 991 | { |
992 | Channel *c = NULL; | |
993 | char *ctype; | |
e78a59f5 | 994 | int rchan; |
f91d9a89 | 995 | u_int rmaxpack, rwindow, len; |
e78a59f5 | 996 | |
997 | ctype = packet_get_string(&len); | |
998 | rchan = packet_get_int(); | |
999 | rwindow = packet_get_int(); | |
1000 | rmaxpack = packet_get_int(); | |
1001 | ||
188adeb2 | 1002 | debug("server_input_channel_open: ctype %s rchan %d win %d max %d", |
e78a59f5 | 1003 | ctype, rchan, rwindow, rmaxpack); |
1004 | ||
1005 | if (strcmp(ctype, "session") == 0) { | |
43f7a4b8 | 1006 | c = server_request_session(); |
e78a59f5 | 1007 | } else if (strcmp(ctype, "direct-tcpip") == 0) { |
43f7a4b8 | 1008 | c = server_request_direct_tcpip(); |
d20f3c9e | 1009 | } else if (strcmp(ctype, "tun@openssh.com") == 0) { |
1010 | c = server_request_tun(); | |
e78a59f5 | 1011 | } |
1012 | if (c != NULL) { | |
fa08c86b | 1013 | debug("server_input_channel_open: confirm %s", ctype); |
e78a59f5 | 1014 | c->remote_id = rchan; |
1015 | c->remote_window = rwindow; | |
1016 | c->remote_maxpacket = rmaxpack; | |
d18e0850 | 1017 | if (c->type != SSH_CHANNEL_CONNECTING) { |
1018 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1019 | packet_put_int(c->remote_id); | |
1020 | packet_put_int(c->self); | |
1021 | packet_put_int(c->local_window); | |
1022 | packet_put_int(c->local_maxpacket); | |
1023 | packet_send(); | |
1024 | } | |
e78a59f5 | 1025 | } else { |
fa08c86b | 1026 | debug("server_input_channel_open: failure %s", ctype); |
e78a59f5 | 1027 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
1028 | packet_put_int(rchan); | |
1029 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
fbe90f7b | 1030 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
d18e0850 | 1031 | packet_put_cstring("open failed"); |
fbe90f7b | 1032 | packet_put_cstring(""); |
1033 | } | |
e78a59f5 | 1034 | packet_send(); |
1035 | } | |
1036 | xfree(ctype); | |
1037 | } | |
1038 | ||
396c147e | 1039 | static void |
7819b5c3 | 1040 | server_input_global_request(int type, u_int32_t seq, void *ctxt) |
fa08c86b | 1041 | { |
1042 | char *rtype; | |
1043 | int want_reply; | |
1044 | int success = 0; | |
1045 | ||
1046 | rtype = packet_get_string(NULL); | |
1047 | want_reply = packet_get_char(); | |
1048 | debug("server_input_global_request: rtype %s want_reply %d", rtype, want_reply); | |
2b87da3b | 1049 | |
01794848 | 1050 | /* -R style forwarding */ |
fa08c86b | 1051 | if (strcmp(rtype, "tcpip-forward") == 0) { |
1052 | struct passwd *pw; | |
1053 | char *listen_address; | |
1054 | u_short listen_port; | |
1055 | ||
2362db19 | 1056 | pw = the_authctxt->pw; |
95077f48 | 1057 | if (pw == NULL || !the_authctxt->valid) |
fdaef11e | 1058 | fatal("server_input_global_request: no/invalid user"); |
b08a39ff | 1059 | listen_address = packet_get_string(NULL); |
fa08c86b | 1060 | listen_port = (u_short)packet_get_int(); |
1061 | debug("server_input_global_request: tcpip-forward listen %s port %d", | |
1062 | listen_address, listen_port); | |
1063 | ||
1064 | /* check permissions */ | |
1065 | if (!options.allow_tcp_forwarding || | |
e6f15ed1 | 1066 | no_port_forwarding_flag |
1067 | #ifndef NO_IPPORT_RESERVED_CONCEPT | |
1068 | || (listen_port < IPPORT_RESERVED && pw->pw_uid != 0) | |
1069 | #endif | |
98c044d0 | 1070 | ) { |
fa08c86b | 1071 | success = 0; |
1072 | packet_send_debug("Server has disabled port forwarding."); | |
1073 | } else { | |
1074 | /* Start listening on the port */ | |
5641aefa | 1075 | success = channel_setup_remote_fwd_listener( |
1076 | listen_address, listen_port, options.gateway_ports); | |
fa08c86b | 1077 | } |
1078 | xfree(listen_address); | |
d740ec16 | 1079 | } else if (strcmp(rtype, "cancel-tcpip-forward") == 0) { |
1080 | char *cancel_address; | |
1081 | u_short cancel_port; | |
1082 | ||
1083 | cancel_address = packet_get_string(NULL); | |
1084 | cancel_port = (u_short)packet_get_int(); | |
1085 | debug("%s: cancel-tcpip-forward addr %s port %d", __func__, | |
1086 | cancel_address, cancel_port); | |
1087 | ||
1088 | success = channel_cancel_rport_listener(cancel_address, | |
1089 | cancel_port); | |
fa08c86b | 1090 | } |
1091 | if (want_reply) { | |
1092 | packet_start(success ? | |
1093 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); | |
1094 | packet_send(); | |
1095 | packet_write_wait(); | |
1096 | } | |
1097 | xfree(rtype); | |
1098 | } | |
7899c98f | 1099 | static void |
1100 | server_input_channel_req(int type, u_int32_t seq, void *ctxt) | |
1101 | { | |
1102 | Channel *c; | |
1103 | int id, reply, success = 0; | |
1104 | char *rtype; | |
1105 | ||
1106 | id = packet_get_int(); | |
1107 | rtype = packet_get_string(NULL); | |
1108 | reply = packet_get_char(); | |
1109 | ||
1110 | debug("server_input_channel_req: channel %d request %s reply %d", | |
1111 | id, rtype, reply); | |
1112 | ||
1113 | if ((c = channel_lookup(id)) == NULL) | |
1114 | packet_disconnect("server_input_channel_req: " | |
1115 | "unknown channel %d", id); | |
1116 | if (c->type == SSH_CHANNEL_LARVAL || c->type == SSH_CHANNEL_OPEN) | |
1117 | success = session_input_channel_req(c, rtype); | |
1118 | if (reply) { | |
1119 | packet_start(success ? | |
1120 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1121 | packet_put_int(c->remote_id); | |
1122 | packet_send(); | |
1123 | } | |
1124 | xfree(rtype); | |
1125 | } | |
fa08c86b | 1126 | |
396c147e | 1127 | static void |
5ca51e19 | 1128 | server_init_dispatch_20(void) |
e78a59f5 | 1129 | { |
1130 | debug("server_init_dispatch_20"); | |
1131 | dispatch_init(&dispatch_protocol_error); | |
1132 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); | |
1133 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1134 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1135 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
1136 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open); | |
1137 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); | |
1138 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
7899c98f | 1139 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &server_input_channel_req); |
e78a59f5 | 1140 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
fa08c86b | 1141 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request); |
3ffc6336 | 1142 | /* client_alive */ |
95ae2076 | 1143 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_keep_alive); |
1144 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &server_input_keep_alive); | |
1145 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &server_input_keep_alive); | |
7a37c112 | 1146 | /* rekeying */ |
1147 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
e78a59f5 | 1148 | } |
396c147e | 1149 | static void |
5ca51e19 | 1150 | server_init_dispatch_13(void) |
7368a6c8 | 1151 | { |
1152 | debug("server_init_dispatch_13"); | |
1153 | dispatch_init(NULL); | |
1154 | dispatch_set(SSH_CMSG_EOF, &server_input_eof); | |
1155 | dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data); | |
1156 | dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size); | |
1157 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1158 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1159 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
1160 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); | |
1161 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1162 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
1163 | } | |
396c147e | 1164 | static void |
5ca51e19 | 1165 | server_init_dispatch_15(void) |
7368a6c8 | 1166 | { |
1167 | server_init_dispatch_13(); | |
1168 | debug("server_init_dispatch_15"); | |
1169 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1170 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose); | |
1171 | } | |
396c147e | 1172 | static void |
5ca51e19 | 1173 | server_init_dispatch(void) |
7368a6c8 | 1174 | { |
e78a59f5 | 1175 | if (compat20) |
1176 | server_init_dispatch_20(); | |
1177 | else if (compat13) | |
7368a6c8 | 1178 | server_init_dispatch_13(); |
1179 | else | |
1180 | server_init_dispatch_15(); | |
1181 | } |