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028094f4 | 1 | /* $OpenBSD: serverloop.c,v 1.139 2006/07/11 20:07:25 stevesk Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
5260325f | 6 | * Server main loop for handling the interactive session. |
bcbf86ec | 7 | * |
8 | * As far as I am concerned, the code I have written for this software | |
9 | * can be used freely for any purpose. Any derived versions of this | |
10 | * software must be clearly marked as such, and if the derived work is | |
11 | * incompatible with the protocol description in the RFC file, it must be | |
12 | * called by a name other than "ssh" or "Secure Shell". | |
13 | * | |
e78a59f5 | 14 | * SSH2 support by Markus Friedl. |
a96070d4 | 15 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 16 | * |
17 | * Redistribution and use in source and binary forms, with or without | |
18 | * modification, are permitted provided that the following conditions | |
19 | * are met: | |
20 | * 1. Redistributions of source code must retain the above copyright | |
21 | * notice, this list of conditions and the following disclaimer. | |
22 | * 2. Redistributions in binary form must reproduce the above copyright | |
23 | * notice, this list of conditions and the following disclaimer in the | |
24 | * documentation and/or other materials provided with the distribution. | |
25 | * | |
26 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
27 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
28 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
29 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
30 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
31 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
32 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
33 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
34 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
35 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
e78a59f5 | 36 | */ |
8efc0c15 | 37 | |
38 | #include "includes.h" | |
aa2eae64 | 39 | |
40 | #include <sys/types.h> | |
41 | #include <sys/wait.h> | |
9794d008 | 42 | #include <sys/socket.h> |
43 | ||
44 | #include <netinet/in.h> | |
1d3e026f | 45 | |
028094f4 | 46 | #include <errno.h> |
d3221cca | 47 | #include <fcntl.h> |
b1842393 | 48 | #include <pwd.h> |
ada68823 | 49 | #include <signal.h> |
1d3e026f | 50 | #include <termios.h> |
a22aff1f | 51 | |
8efc0c15 | 52 | #include "xmalloc.h" |
8efc0c15 | 53 | #include "packet.h" |
54 | #include "buffer.h" | |
42f11eb2 | 55 | #include "log.h" |
8efc0c15 | 56 | #include "servconf.h" |
00e842d8 | 57 | #include "canohost.h" |
1729c161 | 58 | #include "sshpty.h" |
a5efa1bb | 59 | #include "channels.h" |
7368a6c8 | 60 | #include "compat.h" |
42f11eb2 | 61 | #include "ssh1.h" |
e78a59f5 | 62 | #include "ssh2.h" |
59c97189 | 63 | #include "auth.h" |
e78a59f5 | 64 | #include "session.h" |
7368a6c8 | 65 | #include "dispatch.h" |
38c295d6 | 66 | #include "auth-options.h" |
42f11eb2 | 67 | #include "serverloop.h" |
68 | #include "misc.h" | |
7a37c112 | 69 | #include "kex.h" |
8efc0c15 | 70 | |
33de75a3 | 71 | extern ServerOptions options; |
72 | ||
7a37c112 | 73 | /* XXX */ |
74 | extern Kex *xxx_kex; | |
2362db19 | 75 | extern Authctxt *the_authctxt; |
0bbbf2a4 | 76 | extern int use_privsep; |
7a37c112 | 77 | |
8efc0c15 | 78 | static Buffer stdin_buffer; /* Buffer for stdin data. */ |
79 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
80 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
81 | static int fdin; /* Descriptor for stdin (for writing) */ | |
82 | static int fdout; /* Descriptor for stdout (for reading); | |
83 | May be same number as fdin. */ | |
84 | static int fderr; /* Descriptor for stderr. May be -1. */ | |
85 | static long stdin_bytes = 0; /* Number of bytes written to stdin. */ | |
86 | static long stdout_bytes = 0; /* Number of stdout bytes sent to client. */ | |
87 | static long stderr_bytes = 0; /* Number of stderr bytes sent to client. */ | |
88 | static long fdout_bytes = 0; /* Number of stdout bytes read from program. */ | |
89 | static int stdin_eof = 0; /* EOF message received from client. */ | |
90 | static int fdout_eof = 0; /* EOF encountered reading from fdout. */ | |
91 | static int fderr_eof = 0; /* EOF encountered readung from fderr. */ | |
e68225b2 | 92 | static int fdin_is_tty = 0; /* fdin points to a tty. */ |
8efc0c15 | 93 | static int connection_in; /* Connection to client (input). */ |
94 | static int connection_out; /* Connection to client (output). */ | |
cc94bd38 | 95 | static int connection_closed = 0; /* Connection to client closed. */ |
96 | static u_int buffer_high; /* "Soft" max buffer size. */ | |
72176c0e | 97 | static int client_alive_timeouts = 0; |
8efc0c15 | 98 | |
aa3378df | 99 | /* |
100 | * This SIGCHLD kludge is used to detect when the child exits. The server | |
101 | * will exit after that, as soon as forwarded connections have terminated. | |
102 | */ | |
396c147e | 103 | |
7a934d1b | 104 | static volatile sig_atomic_t child_terminated = 0; /* The child has terminated. */ |
8efc0c15 | 105 | |
0bbbf2a4 | 106 | /* Cleanup on signals (!use_privsep case only) */ |
107 | static volatile sig_atomic_t received_sigterm = 0; | |
108 | ||
396c147e | 109 | /* prototypes */ |
110 | static void server_init_dispatch(void); | |
7368a6c8 | 111 | |
a10be357 | 112 | /* |
113 | * we write to this pipe if a SIGCHLD is caught in order to avoid | |
114 | * the race between select() and child_terminated | |
115 | */ | |
116 | static int notify_pipe[2]; | |
117 | static void | |
118 | notify_setup(void) | |
119 | { | |
120 | if (pipe(notify_pipe) < 0) { | |
121 | error("pipe(notify_pipe) failed %s", strerror(errno)); | |
122 | } else if ((fcntl(notify_pipe[0], F_SETFD, 1) == -1) || | |
123 | (fcntl(notify_pipe[1], F_SETFD, 1) == -1)) { | |
124 | error("fcntl(notify_pipe, F_SETFD) failed %s", strerror(errno)); | |
125 | close(notify_pipe[0]); | |
126 | close(notify_pipe[1]); | |
127 | } else { | |
128 | set_nonblock(notify_pipe[0]); | |
129 | set_nonblock(notify_pipe[1]); | |
130 | return; | |
131 | } | |
132 | notify_pipe[0] = -1; /* read end */ | |
133 | notify_pipe[1] = -1; /* write end */ | |
134 | } | |
135 | static void | |
136 | notify_parent(void) | |
137 | { | |
138 | if (notify_pipe[1] != -1) | |
139 | write(notify_pipe[1], "", 1); | |
140 | } | |
141 | static void | |
142 | notify_prepare(fd_set *readset) | |
143 | { | |
144 | if (notify_pipe[0] != -1) | |
145 | FD_SET(notify_pipe[0], readset); | |
146 | } | |
147 | static void | |
148 | notify_done(fd_set *readset) | |
149 | { | |
150 | char c; | |
151 | ||
152 | if (notify_pipe[0] != -1 && FD_ISSET(notify_pipe[0], readset)) | |
153 | while (read(notify_pipe[0], &c, 1) != -1) | |
154 | debug2("notify_done: reading"); | |
155 | } | |
156 | ||
3efa8ea9 | 157 | /*ARGSUSED*/ |
396c147e | 158 | static void |
5260325f | 159 | sigchld_handler(int sig) |
e78a59f5 | 160 | { |
161 | int save_errno = errno; | |
e78a59f5 | 162 | child_terminated = 1; |
ef51930f | 163 | #ifndef _UNICOS |
c9130033 | 164 | mysignal(SIGCHLD, sigchld_handler); |
ef51930f | 165 | #endif |
a10be357 | 166 | notify_parent(); |
e78a59f5 | 167 | errno = save_errno; |
168 | } | |
8efc0c15 | 169 | |
3efa8ea9 | 170 | /*ARGSUSED*/ |
0bbbf2a4 | 171 | static void |
172 | sigterm_handler(int sig) | |
173 | { | |
174 | received_sigterm = sig; | |
175 | } | |
176 | ||
5260325f | 177 | /* |
178 | * Make packets from buffered stderr data, and buffer it for sending | |
179 | * to the client. | |
180 | */ | |
396c147e | 181 | static void |
5ca51e19 | 182 | make_packets_from_stderr_data(void) |
8efc0c15 | 183 | { |
a27002e5 | 184 | u_int len; |
5260325f | 185 | |
186 | /* Send buffered stderr data to the client. */ | |
187 | while (buffer_len(&stderr_buffer) > 0 && | |
a408af76 | 188 | packet_not_very_much_data_to_write()) { |
5260325f | 189 | len = buffer_len(&stderr_buffer); |
190 | if (packet_is_interactive()) { | |
191 | if (len > 512) | |
192 | len = 512; | |
193 | } else { | |
194 | /* Keep the packets at reasonable size. */ | |
195 | if (len > packet_get_maxsize()) | |
196 | len = packet_get_maxsize(); | |
197 | } | |
198 | packet_start(SSH_SMSG_STDERR_DATA); | |
199 | packet_put_string(buffer_ptr(&stderr_buffer), len); | |
200 | packet_send(); | |
201 | buffer_consume(&stderr_buffer, len); | |
202 | stderr_bytes += len; | |
8efc0c15 | 203 | } |
8efc0c15 | 204 | } |
205 | ||
5260325f | 206 | /* |
207 | * Make packets from buffered stdout data, and buffer it for sending to the | |
208 | * client. | |
209 | */ | |
396c147e | 210 | static void |
5ca51e19 | 211 | make_packets_from_stdout_data(void) |
8efc0c15 | 212 | { |
a27002e5 | 213 | u_int len; |
5260325f | 214 | |
215 | /* Send buffered stdout data to the client. */ | |
216 | while (buffer_len(&stdout_buffer) > 0 && | |
a408af76 | 217 | packet_not_very_much_data_to_write()) { |
5260325f | 218 | len = buffer_len(&stdout_buffer); |
219 | if (packet_is_interactive()) { | |
220 | if (len > 512) | |
221 | len = 512; | |
222 | } else { | |
223 | /* Keep the packets at reasonable size. */ | |
224 | if (len > packet_get_maxsize()) | |
2b87da3b | 225 | len = packet_get_maxsize(); |
5260325f | 226 | } |
227 | packet_start(SSH_SMSG_STDOUT_DATA); | |
228 | packet_put_string(buffer_ptr(&stdout_buffer), len); | |
229 | packet_send(); | |
230 | buffer_consume(&stdout_buffer, len); | |
231 | stdout_bytes += len; | |
8efc0c15 | 232 | } |
8efc0c15 | 233 | } |
234 | ||
72176c0e | 235 | static void |
236 | client_alive_check(void) | |
237 | { | |
95ae2076 | 238 | int channel_id; |
99416ceb | 239 | |
72176c0e | 240 | /* timeout, check to see how many we have had */ |
241 | if (++client_alive_timeouts > options.client_alive_count_max) | |
242 | packet_disconnect("Timeout, your session not responding."); | |
243 | ||
72176c0e | 244 | /* |
95ae2076 | 245 | * send a bogus global/channel request with "wantreply", |
72176c0e | 246 | * we should get back a failure |
247 | */ | |
95ae2076 | 248 | if ((channel_id = channel_find_open()) == -1) { |
249 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
250 | packet_put_cstring("keepalive@openssh.com"); | |
251 | packet_put_char(1); /* boolean: want reply */ | |
252 | } else { | |
253 | channel_request_start(channel_id, "keepalive@openssh.com", 1); | |
254 | } | |
72176c0e | 255 | packet_send(); |
256 | } | |
257 | ||
5260325f | 258 | /* |
259 | * Sleep in select() until we can do something. This will initialize the | |
260 | * select masks. Upon return, the masks will indicate which descriptors | |
261 | * have data or can accept data. Optionally, a maximum time can be specified | |
262 | * for the duration of the wait (0 = infinite). | |
263 | */ | |
396c147e | 264 | static void |
39929cdb | 265 | wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 266 | u_int *nallocp, u_int max_time_milliseconds) |
8efc0c15 | 267 | { |
5260325f | 268 | struct timeval tv, *tvp; |
269 | int ret; | |
3ffc6336 | 270 | int client_alive_scheduled = 0; |
271 | ||
272 | /* | |
184eed6a | 273 | * if using client_alive, set the max timeout accordingly, |
3ffc6336 | 274 | * and indicate that this particular timeout was for client |
275 | * alive by setting the client_alive_scheduled flag. | |
276 | * | |
277 | * this could be randomized somewhat to make traffic | |
184eed6a | 278 | * analysis more difficult, but we're not doing it yet. |
3ffc6336 | 279 | */ |
2c5b1791 | 280 | if (compat20 && |
281 | max_time_milliseconds == 0 && options.client_alive_interval) { | |
39aefe7b | 282 | client_alive_scheduled = 1; |
3ffc6336 | 283 | max_time_milliseconds = options.client_alive_interval * 1000; |
2c5b1791 | 284 | } |
8efc0c15 | 285 | |
39929cdb | 286 | /* Allocate and update select() masks for channel descriptors. */ |
489aa2e9 | 287 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, 0); |
5260325f | 288 | |
e78a59f5 | 289 | if (compat20) { |
0c139bd1 | 290 | #if 0 |
1d1ffb87 | 291 | /* wrong: bad condition XXX */ |
e78a59f5 | 292 | if (channel_not_very_much_buffered_data()) |
0c139bd1 | 293 | #endif |
294 | FD_SET(connection_in, *readsetp); | |
e78a59f5 | 295 | } else { |
71276795 | 296 | /* |
297 | * Read packets from the client unless we have too much | |
298 | * buffered stdin or channel data. | |
299 | */ | |
300 | if (buffer_len(&stdin_buffer) < buffer_high && | |
e78a59f5 | 301 | channel_not_very_much_buffered_data()) |
39929cdb | 302 | FD_SET(connection_in, *readsetp); |
71276795 | 303 | /* |
304 | * If there is not too much data already buffered going to | |
305 | * the client, try to get some more data from the program. | |
306 | */ | |
307 | if (packet_not_very_much_data_to_write()) { | |
308 | if (!fdout_eof) | |
39929cdb | 309 | FD_SET(fdout, *readsetp); |
71276795 | 310 | if (!fderr_eof) |
39929cdb | 311 | FD_SET(fderr, *readsetp); |
71276795 | 312 | } |
313 | /* | |
314 | * If we have buffered data, try to write some of that data | |
315 | * to the program. | |
316 | */ | |
317 | if (fdin != -1 && buffer_len(&stdin_buffer) > 0) | |
39929cdb | 318 | FD_SET(fdin, *writesetp); |
e78a59f5 | 319 | } |
a10be357 | 320 | notify_prepare(*readsetp); |
5260325f | 321 | |
aa3378df | 322 | /* |
323 | * If we have buffered packet data going to the client, mark that | |
324 | * descriptor. | |
325 | */ | |
5260325f | 326 | if (packet_have_data_to_write()) |
39929cdb | 327 | FD_SET(connection_out, *writesetp); |
5260325f | 328 | |
aa3378df | 329 | /* |
330 | * If child has terminated and there is enough buffer space to read | |
331 | * from it, then read as much as is available and exit. | |
332 | */ | |
5260325f | 333 | if (child_terminated && packet_not_very_much_data_to_write()) |
3ffc6336 | 334 | if (max_time_milliseconds == 0 || client_alive_scheduled) |
5260325f | 335 | max_time_milliseconds = 100; |
336 | ||
337 | if (max_time_milliseconds == 0) | |
338 | tvp = NULL; | |
339 | else { | |
340 | tv.tv_sec = max_time_milliseconds / 1000; | |
341 | tv.tv_usec = 1000 * (max_time_milliseconds % 1000); | |
342 | tvp = &tv; | |
343 | } | |
8efc0c15 | 344 | |
5260325f | 345 | /* Wait for something to happen, or the timeout to expire. */ |
39929cdb | 346 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); |
8efc0c15 | 347 | |
3ffc6336 | 348 | if (ret == -1) { |
b3ad8fe6 | 349 | memset(*readsetp, 0, *nallocp); |
350 | memset(*writesetp, 0, *nallocp); | |
5260325f | 351 | if (errno != EINTR) |
352 | error("select: %.100s", strerror(errno)); | |
418e724c | 353 | } else if (ret == 0 && client_alive_scheduled) |
72176c0e | 354 | client_alive_check(); |
a10be357 | 355 | |
356 | notify_done(*readsetp); | |
8efc0c15 | 357 | } |
358 | ||
5260325f | 359 | /* |
360 | * Processes input from the client and the program. Input data is stored | |
361 | * in buffers and processed later. | |
362 | */ | |
396c147e | 363 | static void |
b476adfa | 364 | process_input(fd_set *readset) |
5260325f | 365 | { |
366 | int len; | |
367 | char buf[16384]; | |
368 | ||
369 | /* Read and buffer any input data from the client. */ | |
370 | if (FD_ISSET(connection_in, readset)) { | |
371 | len = read(connection_in, buf, sizeof(buf)); | |
372 | if (len == 0) { | |
00e842d8 | 373 | verbose("Connection closed by %.100s", |
374 | get_remote_ipaddr()); | |
cc94bd38 | 375 | connection_closed = 1; |
376 | if (compat20) | |
377 | return; | |
2362db19 | 378 | cleanup_exit(255); |
0e73cc53 | 379 | } else if (len < 0) { |
380 | if (errno != EINTR && errno != EAGAIN) { | |
00e842d8 | 381 | verbose("Read error from remote host " |
382 | "%.100s: %.100s", | |
383 | get_remote_ipaddr(), strerror(errno)); | |
2362db19 | 384 | cleanup_exit(255); |
0e73cc53 | 385 | } |
386 | } else { | |
387 | /* Buffer any received data. */ | |
388 | packet_process_incoming(buf, len); | |
5260325f | 389 | } |
5260325f | 390 | } |
e78a59f5 | 391 | if (compat20) |
392 | return; | |
393 | ||
5260325f | 394 | /* Read and buffer any available stdout data from the program. */ |
395 | if (!fdout_eof && FD_ISSET(fdout, readset)) { | |
ea8c44d9 | 396 | errno = 0; |
5260325f | 397 | len = read(fdout, buf, sizeof(buf)); |
0e73cc53 | 398 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { |
399 | /* do nothing */ | |
24a87055 | 400 | #ifndef PTY_ZEROREAD |
0e73cc53 | 401 | } else if (len <= 0) { |
ea8c44d9 | 402 | #else |
9c04d67d | 403 | } else if ((!isatty(fdout) && len <= 0) || |
404 | (isatty(fdout) && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 405 | #endif |
5260325f | 406 | fdout_eof = 1; |
0e73cc53 | 407 | } else { |
5260325f | 408 | buffer_append(&stdout_buffer, buf, len); |
409 | fdout_bytes += len; | |
410 | } | |
411 | } | |
412 | /* Read and buffer any available stderr data from the program. */ | |
413 | if (!fderr_eof && FD_ISSET(fderr, readset)) { | |
ea8c44d9 | 414 | errno = 0; |
5260325f | 415 | len = read(fderr, buf, sizeof(buf)); |
0e73cc53 | 416 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { |
417 | /* do nothing */ | |
24a87055 | 418 | #ifndef PTY_ZEROREAD |
0e73cc53 | 419 | } else if (len <= 0) { |
ea8c44d9 | 420 | #else |
9c04d67d | 421 | } else if ((!isatty(fderr) && len <= 0) || |
422 | (isatty(fderr) && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 423 | #endif |
5260325f | 424 | fderr_eof = 1; |
0e73cc53 | 425 | } else { |
5260325f | 426 | buffer_append(&stderr_buffer, buf, len); |
0e73cc53 | 427 | } |
5260325f | 428 | } |
429 | } | |
8efc0c15 | 430 | |
5260325f | 431 | /* |
432 | * Sends data from internal buffers to client program stdin. | |
433 | */ | |
396c147e | 434 | static void |
b476adfa | 435 | process_output(fd_set *writeset) |
8efc0c15 | 436 | { |
4ef922e3 | 437 | struct termios tio; |
780a9951 | 438 | u_char *data; |
439 | u_int dlen; | |
5260325f | 440 | int len; |
441 | ||
442 | /* Write buffered data to program stdin. */ | |
e78a59f5 | 443 | if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) { |
780a9951 | 444 | data = buffer_ptr(&stdin_buffer); |
445 | dlen = buffer_len(&stdin_buffer); | |
446 | len = write(fdin, data, dlen); | |
0e73cc53 | 447 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { |
448 | /* do nothing */ | |
449 | } else if (len <= 0) { | |
7368a6c8 | 450 | if (fdin != fdout) |
5260325f | 451 | close(fdin); |
452 | else | |
453 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ | |
5260325f | 454 | fdin = -1; |
455 | } else { | |
4ef922e3 | 456 | /* Successful write. */ |
780a9951 | 457 | if (fdin_is_tty && dlen >= 1 && data[0] != '\r' && |
458 | tcgetattr(fdin, &tio) == 0 && | |
0ae4fe1d | 459 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { |
62da27dd | 460 | /* |
461 | * Simulate echo to reduce the impact of | |
462 | * traffic analysis | |
463 | */ | |
95ce5599 | 464 | packet_send_ignore(len); |
4ef922e3 | 465 | packet_send(); |
466 | } | |
467 | /* Consume the data from the buffer. */ | |
5260325f | 468 | buffer_consume(&stdin_buffer, len); |
469 | /* Update the count of bytes written to the program. */ | |
470 | stdin_bytes += len; | |
471 | } | |
8efc0c15 | 472 | } |
5260325f | 473 | /* Send any buffered packet data to the client. */ |
474 | if (FD_ISSET(connection_out, writeset)) | |
475 | packet_write_poll(); | |
8efc0c15 | 476 | } |
477 | ||
5260325f | 478 | /* |
479 | * Wait until all buffered output has been sent to the client. | |
480 | * This is used when the program terminates. | |
481 | */ | |
396c147e | 482 | static void |
5ca51e19 | 483 | drain_output(void) |
8efc0c15 | 484 | { |
5260325f | 485 | /* Send any buffered stdout data to the client. */ |
486 | if (buffer_len(&stdout_buffer) > 0) { | |
487 | packet_start(SSH_SMSG_STDOUT_DATA); | |
488 | packet_put_string(buffer_ptr(&stdout_buffer), | |
489 | buffer_len(&stdout_buffer)); | |
490 | packet_send(); | |
491 | /* Update the count of sent bytes. */ | |
492 | stdout_bytes += buffer_len(&stdout_buffer); | |
493 | } | |
494 | /* Send any buffered stderr data to the client. */ | |
495 | if (buffer_len(&stderr_buffer) > 0) { | |
496 | packet_start(SSH_SMSG_STDERR_DATA); | |
497 | packet_put_string(buffer_ptr(&stderr_buffer), | |
498 | buffer_len(&stderr_buffer)); | |
499 | packet_send(); | |
500 | /* Update the count of sent bytes. */ | |
501 | stderr_bytes += buffer_len(&stderr_buffer); | |
502 | } | |
503 | /* Wait until all buffered data has been written to the client. */ | |
504 | packet_write_wait(); | |
8efc0c15 | 505 | } |
506 | ||
396c147e | 507 | static void |
5ca51e19 | 508 | process_buffered_input_packets(void) |
7368a6c8 | 509 | { |
7a37c112 | 510 | dispatch_run(DISPATCH_NONBLOCK, NULL, compat20 ? xxx_kex : NULL); |
7368a6c8 | 511 | } |
512 | ||
5260325f | 513 | /* |
514 | * Performs the interactive session. This handles data transmission between | |
515 | * the client and the program. Note that the notion of stdin, stdout, and | |
516 | * stderr in this function is sort of reversed: this function writes to | |
517 | * stdin (of the child program), and reads from stdout and stderr (of the | |
518 | * child program). | |
519 | */ | |
6ae2364d | 520 | void |
9da5c3c9 | 521 | server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg) |
8efc0c15 | 522 | { |
39929cdb | 523 | fd_set *readset = NULL, *writeset = NULL; |
9a995072 | 524 | int max_fd = 0; |
525 | u_int nalloc = 0; | |
9da5c3c9 | 526 | int wait_status; /* Status returned by wait(). */ |
527 | pid_t wait_pid; /* pid returned by wait(). */ | |
5260325f | 528 | int waiting_termination = 0; /* Have displayed waiting close message. */ |
1e3b8b07 | 529 | u_int max_time_milliseconds; |
530 | u_int previous_stdout_buffer_bytes; | |
531 | u_int stdout_buffer_bytes; | |
5260325f | 532 | int type; |
533 | ||
534 | debug("Entering interactive session."); | |
535 | ||
536 | /* Initialize the SIGCHLD kludge. */ | |
5260325f | 537 | child_terminated = 0; |
42ad0eec | 538 | mysignal(SIGCHLD, sigchld_handler); |
5260325f | 539 | |
0bbbf2a4 | 540 | if (!use_privsep) { |
541 | signal(SIGTERM, sigterm_handler); | |
542 | signal(SIGINT, sigterm_handler); | |
543 | signal(SIGQUIT, sigterm_handler); | |
544 | } | |
545 | ||
5260325f | 546 | /* Initialize our global variables. */ |
547 | fdin = fdin_arg; | |
548 | fdout = fdout_arg; | |
549 | fderr = fderr_arg; | |
0e73cc53 | 550 | |
551 | /* nonblocking IO */ | |
552 | set_nonblock(fdin); | |
553 | set_nonblock(fdout); | |
ff873e98 | 554 | /* we don't have stderr for interactive terminal sessions, see below */ |
555 | if (fderr != -1) | |
556 | set_nonblock(fderr); | |
0e73cc53 | 557 | |
e68225b2 | 558 | if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin)) |
559 | fdin_is_tty = 1; | |
560 | ||
5260325f | 561 | connection_in = packet_get_connection_in(); |
562 | connection_out = packet_get_connection_out(); | |
563 | ||
a10be357 | 564 | notify_setup(); |
565 | ||
5260325f | 566 | previous_stdout_buffer_bytes = 0; |
567 | ||
568 | /* Set approximate I/O buffer size. */ | |
569 | if (packet_is_interactive()) | |
570 | buffer_high = 4096; | |
571 | else | |
572 | buffer_high = 64 * 1024; | |
573 | ||
489aa2e9 | 574 | #if 0 |
5260325f | 575 | /* Initialize max_fd to the maximum of the known file descriptors. */ |
489aa2e9 | 576 | max_fd = MAX(connection_in, connection_out); |
577 | max_fd = MAX(max_fd, fdin); | |
578 | max_fd = MAX(max_fd, fdout); | |
39929cdb | 579 | if (fderr != -1) |
580 | max_fd = MAX(max_fd, fderr); | |
489aa2e9 | 581 | #endif |
5260325f | 582 | |
583 | /* Initialize Initialize buffers. */ | |
584 | buffer_init(&stdin_buffer); | |
585 | buffer_init(&stdout_buffer); | |
586 | buffer_init(&stderr_buffer); | |
587 | ||
aa3378df | 588 | /* |
589 | * If we have no separate fderr (which is the case when we have a pty | |
590 | * - there we cannot make difference between data sent to stdout and | |
591 | * stderr), indicate that we have seen an EOF from stderr. This way | |
7b9b0103 | 592 | * we don't need to check the descriptor everywhere. |
aa3378df | 593 | */ |
5260325f | 594 | if (fderr == -1) |
595 | fderr_eof = 1; | |
596 | ||
7368a6c8 | 597 | server_init_dispatch(); |
598 | ||
5260325f | 599 | /* Main loop of the server for the interactive session mode. */ |
600 | for (;;) { | |
5260325f | 601 | |
602 | /* Process buffered packets from the client. */ | |
603 | process_buffered_input_packets(); | |
604 | ||
aa3378df | 605 | /* |
606 | * If we have received eof, and there is no more pending | |
607 | * input data, cause a real eof by closing fdin. | |
608 | */ | |
5260325f | 609 | if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) { |
7368a6c8 | 610 | if (fdin != fdout) |
5260325f | 611 | close(fdin); |
612 | else | |
613 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ | |
5260325f | 614 | fdin = -1; |
615 | } | |
aa3378df | 616 | /* Make packets from buffered stderr data to send to the client. */ |
5260325f | 617 | make_packets_from_stderr_data(); |
618 | ||
aa3378df | 619 | /* |
620 | * Make packets from buffered stdout data to send to the | |
621 | * client. If there is very little to send, this arranges to | |
622 | * not send them now, but to wait a short while to see if we | |
623 | * are getting more data. This is necessary, as some systems | |
624 | * wake up readers from a pty after each separate character. | |
625 | */ | |
5260325f | 626 | max_time_milliseconds = 0; |
627 | stdout_buffer_bytes = buffer_len(&stdout_buffer); | |
628 | if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 && | |
629 | stdout_buffer_bytes != previous_stdout_buffer_bytes) { | |
630 | /* try again after a while */ | |
631 | max_time_milliseconds = 10; | |
632 | } else { | |
633 | /* Send it now. */ | |
634 | make_packets_from_stdout_data(); | |
635 | } | |
636 | previous_stdout_buffer_bytes = buffer_len(&stdout_buffer); | |
637 | ||
638 | /* Send channel data to the client. */ | |
639 | if (packet_not_very_much_data_to_write()) | |
640 | channel_output_poll(); | |
641 | ||
aa3378df | 642 | /* |
643 | * Bail out of the loop if the program has closed its output | |
644 | * descriptors, and we have no more data to send to the | |
645 | * client, and there is no pending buffered data. | |
646 | */ | |
7062c40f | 647 | if (fdout_eof && fderr_eof && !packet_have_data_to_write() && |
648 | buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) { | |
5260325f | 649 | if (!channel_still_open()) |
7368a6c8 | 650 | break; |
5260325f | 651 | if (!waiting_termination) { |
652 | const char *s = "Waiting for forwarded connections to terminate...\r\n"; | |
653 | char *cp; | |
654 | waiting_termination = 1; | |
655 | buffer_append(&stderr_buffer, s, strlen(s)); | |
656 | ||
657 | /* Display list of open channels. */ | |
658 | cp = channel_open_message(); | |
659 | buffer_append(&stderr_buffer, cp, strlen(cp)); | |
660 | xfree(cp); | |
661 | } | |
662 | } | |
489aa2e9 | 663 | max_fd = MAX(connection_in, connection_out); |
664 | max_fd = MAX(max_fd, fdin); | |
665 | max_fd = MAX(max_fd, fdout); | |
666 | max_fd = MAX(max_fd, fderr); | |
a10be357 | 667 | max_fd = MAX(max_fd, notify_pipe[0]); |
489aa2e9 | 668 | |
5260325f | 669 | /* Sleep in select() until we can do something. */ |
39929cdb | 670 | wait_until_can_do_something(&readset, &writeset, &max_fd, |
489aa2e9 | 671 | &nalloc, max_time_milliseconds); |
5260325f | 672 | |
0bbbf2a4 | 673 | if (received_sigterm) { |
674 | logit("Exiting on signal %d", received_sigterm); | |
675 | /* Clean up sessions, utmp, etc. */ | |
676 | cleanup_exit(255); | |
677 | } | |
678 | ||
5260325f | 679 | /* Process any channel events. */ |
39929cdb | 680 | channel_after_select(readset, writeset); |
5260325f | 681 | |
682 | /* Process input from the client and from program stdout/stderr. */ | |
39929cdb | 683 | process_input(readset); |
5260325f | 684 | |
685 | /* Process output to the client and to program stdin. */ | |
39929cdb | 686 | process_output(writeset); |
8efc0c15 | 687 | } |
39929cdb | 688 | if (readset) |
689 | xfree(readset); | |
690 | if (writeset) | |
691 | xfree(writeset); | |
8efc0c15 | 692 | |
5260325f | 693 | /* Cleanup and termination code. */ |
8efc0c15 | 694 | |
5260325f | 695 | /* Wait until all output has been sent to the client. */ |
696 | drain_output(); | |
8efc0c15 | 697 | |
5260325f | 698 | debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.", |
184eed6a | 699 | stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes); |
8efc0c15 | 700 | |
5260325f | 701 | /* Free and clear the buffers. */ |
702 | buffer_free(&stdin_buffer); | |
703 | buffer_free(&stdout_buffer); | |
704 | buffer_free(&stderr_buffer); | |
8efc0c15 | 705 | |
5260325f | 706 | /* Close the file descriptors. */ |
707 | if (fdout != -1) | |
708 | close(fdout); | |
709 | fdout = -1; | |
710 | fdout_eof = 1; | |
711 | if (fderr != -1) | |
712 | close(fderr); | |
713 | fderr = -1; | |
714 | fderr_eof = 1; | |
715 | if (fdin != -1) | |
716 | close(fdin); | |
717 | fdin = -1; | |
718 | ||
d6746a0b | 719 | channel_free_all(); |
5260325f | 720 | |
5260325f | 721 | /* We no longer want our SIGCHLD handler to be called. */ |
42ad0eec | 722 | mysignal(SIGCHLD, SIG_DFL); |
5260325f | 723 | |
8c38e88b | 724 | while ((wait_pid = waitpid(-1, &wait_status, 0)) < 0) |
725 | if (errno != EINTR) | |
726 | packet_disconnect("wait: %.100s", strerror(errno)); | |
727 | if (wait_pid != pid) | |
c457707e | 728 | error("Strange, wait returned pid %ld, expected %ld", |
729 | (long)wait_pid, (long)pid); | |
c9130033 | 730 | |
5260325f | 731 | /* Check if it exited normally. */ |
732 | if (WIFEXITED(wait_status)) { | |
733 | /* Yes, normal exit. Get exit status and send it to the client. */ | |
734 | debug("Command exited with status %d.", WEXITSTATUS(wait_status)); | |
735 | packet_start(SSH_SMSG_EXITSTATUS); | |
736 | packet_put_int(WEXITSTATUS(wait_status)); | |
737 | packet_send(); | |
738 | packet_write_wait(); | |
739 | ||
aa3378df | 740 | /* |
741 | * Wait for exit confirmation. Note that there might be | |
742 | * other packets coming before it; however, the program has | |
743 | * already died so we just ignore them. The client is | |
744 | * supposed to respond with the confirmation when it receives | |
745 | * the exit status. | |
746 | */ | |
5260325f | 747 | do { |
54a5250f | 748 | type = packet_read(); |
5260325f | 749 | } |
750 | while (type != SSH_CMSG_EXIT_CONFIRMATION); | |
751 | ||
752 | debug("Received exit confirmation."); | |
753 | return; | |
754 | } | |
755 | /* Check if the program terminated due to a signal. */ | |
756 | if (WIFSIGNALED(wait_status)) | |
757 | packet_disconnect("Command terminated on signal %d.", | |
758 | WTERMSIG(wait_status)); | |
759 | ||
760 | /* Some weird exit cause. Just exit. */ | |
761 | packet_disconnect("wait returned status %04x.", wait_status); | |
762 | /* NOTREACHED */ | |
763 | } | |
7368a6c8 | 764 | |
418e724c | 765 | static void |
766 | collect_children(void) | |
767 | { | |
768 | pid_t pid; | |
769 | sigset_t oset, nset; | |
770 | int status; | |
771 | ||
772 | /* block SIGCHLD while we check for dead children */ | |
773 | sigemptyset(&nset); | |
774 | sigaddset(&nset, SIGCHLD); | |
775 | sigprocmask(SIG_BLOCK, &nset, &oset); | |
776 | if (child_terminated) { | |
140000b4 | 777 | debug("Received SIGCHLD."); |
8c38e88b | 778 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || |
779 | (pid < 0 && errno == EINTR)) | |
780 | if (pid > 0) | |
781 | session_close_by_pid(pid, status); | |
418e724c | 782 | child_terminated = 0; |
783 | } | |
784 | sigprocmask(SIG_SETMASK, &oset, NULL); | |
785 | } | |
786 | ||
6ae2364d | 787 | void |
57156994 | 788 | server_loop2(Authctxt *authctxt) |
e78a59f5 | 789 | { |
39929cdb | 790 | fd_set *readset = NULL, *writeset = NULL; |
418e724c | 791 | int rekeying = 0, max_fd, nalloc = 0; |
e78a59f5 | 792 | |
793 | debug("Entering interactive session for SSH2."); | |
794 | ||
c9130033 | 795 | mysignal(SIGCHLD, sigchld_handler); |
e78a59f5 | 796 | child_terminated = 0; |
797 | connection_in = packet_get_connection_in(); | |
798 | connection_out = packet_get_connection_out(); | |
39929cdb | 799 | |
0bbbf2a4 | 800 | if (!use_privsep) { |
801 | signal(SIGTERM, sigterm_handler); | |
802 | signal(SIGINT, sigterm_handler); | |
803 | signal(SIGQUIT, sigterm_handler); | |
804 | } | |
805 | ||
a10be357 | 806 | notify_setup(); |
807 | ||
39929cdb | 808 | max_fd = MAX(connection_in, connection_out); |
a10be357 | 809 | max_fd = MAX(max_fd, notify_pipe[0]); |
810 | ||
e78a59f5 | 811 | server_init_dispatch(); |
812 | ||
813 | for (;;) { | |
814 | process_buffered_input_packets(); | |
bbb4cc1b | 815 | |
cd332296 | 816 | rekeying = (xxx_kex != NULL && !xxx_kex->done); |
bbb4cc1b | 817 | |
bbb4cc1b | 818 | if (!rekeying && packet_not_very_much_data_to_write()) |
e78a59f5 | 819 | channel_output_poll(); |
bbb4cc1b | 820 | wait_until_can_do_something(&readset, &writeset, &max_fd, |
489aa2e9 | 821 | &nalloc, 0); |
d5f24f94 | 822 | |
0bbbf2a4 | 823 | if (received_sigterm) { |
824 | logit("Exiting on signal %d", received_sigterm); | |
825 | /* Clean up sessions, utmp, etc. */ | |
826 | cleanup_exit(255); | |
827 | } | |
828 | ||
418e724c | 829 | collect_children(); |
ffd7b36b | 830 | if (!rekeying) { |
bbb4cc1b | 831 | channel_after_select(readset, writeset); |
ffd7b36b | 832 | if (packet_need_rekeying()) { |
833 | debug("need rekeying"); | |
834 | xxx_kex->done = 0; | |
835 | kex_send_kexinit(xxx_kex); | |
836 | } | |
837 | } | |
39929cdb | 838 | process_input(readset); |
cc94bd38 | 839 | if (connection_closed) |
840 | break; | |
39929cdb | 841 | process_output(writeset); |
e78a59f5 | 842 | } |
418e724c | 843 | collect_children(); |
844 | ||
39929cdb | 845 | if (readset) |
846 | xfree(readset); | |
847 | if (writeset) | |
848 | xfree(writeset); | |
849 | ||
d5f24f94 | 850 | /* free all channels, no more reads and writes */ |
851 | channel_free_all(); | |
5b5d170c | 852 | |
418e724c | 853 | /* free remaining sessions, e.g. remove wtmp entries */ |
1853d1ef | 854 | session_destroy_all(NULL); |
e78a59f5 | 855 | } |
856 | ||
396c147e | 857 | static void |
95ae2076 | 858 | server_input_keep_alive(int type, u_int32_t seq, void *ctxt) |
3ffc6336 | 859 | { |
95ae2076 | 860 | debug("Got %d/%u for keepalive", type, seq); |
184eed6a | 861 | /* |
39aefe7b | 862 | * reset timeout, since we got a sane answer from the client. |
3ffc6336 | 863 | * even if this was generated by something other than |
864 | * the bogus CHANNEL_REQUEST we send for keepalives. | |
865 | */ | |
184eed6a | 866 | client_alive_timeouts = 0; |
3ffc6336 | 867 | } |
868 | ||
396c147e | 869 | static void |
7819b5c3 | 870 | server_input_stdin_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 871 | { |
872 | char *data; | |
1e3b8b07 | 873 | u_int data_len; |
7368a6c8 | 874 | |
875 | /* Stdin data from the client. Append it to the buffer. */ | |
876 | /* Ignore any data if the client has closed stdin. */ | |
877 | if (fdin == -1) | |
878 | return; | |
879 | data = packet_get_string(&data_len); | |
95500969 | 880 | packet_check_eom(); |
7368a6c8 | 881 | buffer_append(&stdin_buffer, data, data_len); |
882 | memset(data, 0, data_len); | |
883 | xfree(data); | |
884 | } | |
885 | ||
396c147e | 886 | static void |
7819b5c3 | 887 | server_input_eof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 888 | { |
889 | /* | |
890 | * Eof from the client. The stdin descriptor to the | |
891 | * program will be closed when all buffered data has | |
892 | * drained. | |
893 | */ | |
894 | debug("EOF received for stdin."); | |
95500969 | 895 | packet_check_eom(); |
7368a6c8 | 896 | stdin_eof = 1; |
897 | } | |
898 | ||
396c147e | 899 | static void |
7819b5c3 | 900 | server_input_window_size(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 901 | { |
148de80c | 902 | u_int row = packet_get_int(); |
903 | u_int col = packet_get_int(); | |
904 | u_int xpixel = packet_get_int(); | |
905 | u_int ypixel = packet_get_int(); | |
7368a6c8 | 906 | |
907 | debug("Window change received."); | |
95500969 | 908 | packet_check_eom(); |
7368a6c8 | 909 | if (fdin != -1) |
910 | pty_change_window_size(fdin, row, col, xpixel, ypixel); | |
911 | } | |
912 | ||
396c147e | 913 | static Channel * |
43f7a4b8 | 914 | server_request_direct_tcpip(void) |
e78a59f5 | 915 | { |
719fc62f | 916 | Channel *c; |
917 | int sock; | |
6ae2364d | 918 | char *target, *originator; |
919 | int target_port, originator_port; | |
e78a59f5 | 920 | |
6ae2364d | 921 | target = packet_get_string(NULL); |
922 | target_port = packet_get_int(); | |
e78a59f5 | 923 | originator = packet_get_string(NULL); |
924 | originator_port = packet_get_int(); | |
95500969 | 925 | packet_check_eom(); |
71276795 | 926 | |
fa08c86b | 927 | debug("server_request_direct_tcpip: originator %s port %d, target %s port %d", |
4e2e5cfd | 928 | originator, originator_port, target, target_port); |
38c295d6 | 929 | |
e78a59f5 | 930 | /* XXX check permission */ |
6ae2364d | 931 | sock = channel_connect_to(target, target_port); |
932 | xfree(target); | |
e78a59f5 | 933 | xfree(originator); |
934 | if (sock < 0) | |
fa08c86b | 935 | return NULL; |
43f7a4b8 | 936 | c = channel_new("direct-tcpip", SSH_CHANNEL_CONNECTING, |
bcbf86ec | 937 | sock, sock, -1, CHAN_TCP_WINDOW_DEFAULT, |
0d942eff | 938 | CHAN_TCP_PACKET_DEFAULT, 0, "direct-tcpip", 1); |
719fc62f | 939 | return c; |
fa08c86b | 940 | } |
941 | ||
d20f3c9e | 942 | static Channel * |
943 | server_request_tun(void) | |
944 | { | |
945 | Channel *c = NULL; | |
a4f24bf8 | 946 | int mode, tun; |
947 | int sock; | |
d20f3c9e | 948 | |
a4f24bf8 | 949 | mode = packet_get_int(); |
950 | switch (mode) { | |
951 | case SSH_TUNMODE_POINTOPOINT: | |
952 | case SSH_TUNMODE_ETHERNET: | |
953 | break; | |
954 | default: | |
955 | packet_send_debug("Unsupported tunnel device mode."); | |
956 | return NULL; | |
957 | } | |
958 | if ((options.permit_tun & mode) == 0) { | |
959 | packet_send_debug("Server has rejected tunnel device " | |
960 | "forwarding"); | |
d20f3c9e | 961 | return NULL; |
962 | } | |
963 | ||
964 | tun = packet_get_int(); | |
a2b1748a | 965 | if (forced_tun_device != -1) { |
3efa8ea9 | 966 | if (tun != SSH_TUNID_ANY && forced_tun_device != tun) |
d20f3c9e | 967 | goto done; |
968 | tun = forced_tun_device; | |
969 | } | |
a4f24bf8 | 970 | sock = tun_open(tun, mode); |
d20f3c9e | 971 | if (sock < 0) |
972 | goto done; | |
973 | c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1, | |
974 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); | |
975 | c->datagram = 1; | |
e914f53a | 976 | #if defined(SSH_TUN_FILTER) |
977 | if (mode == SSH_TUNMODE_POINTOPOINT) | |
978 | channel_register_filter(c->self, sys_tun_infilter, | |
979 | sys_tun_outfilter); | |
980 | #endif | |
d20f3c9e | 981 | |
982 | done: | |
983 | if (c == NULL) | |
984 | packet_send_debug("Failed to open the tunnel device."); | |
985 | return c; | |
986 | } | |
987 | ||
396c147e | 988 | static Channel * |
43f7a4b8 | 989 | server_request_session(void) |
fa08c86b | 990 | { |
719fc62f | 991 | Channel *c; |
fa08c86b | 992 | |
993 | debug("input_session_request"); | |
95500969 | 994 | packet_check_eom(); |
fa08c86b | 995 | /* |
996 | * A server session has no fd to read or write until a | |
997 | * CHANNEL_REQUEST for a shell is made, so we set the type to | |
998 | * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all | |
999 | * CHANNEL_REQUEST messages is registered. | |
1000 | */ | |
43f7a4b8 | 1001 | c = channel_new("session", SSH_CHANNEL_LARVAL, |
719fc62f | 1002 | -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT, |
0d942eff | 1003 | 0, "server-session", 1); |
2362db19 | 1004 | if (session_open(the_authctxt, c->self) != 1) { |
719fc62f | 1005 | debug("session open failed, free channel %d", c->self); |
1006 | channel_free(c); | |
1007 | return NULL; | |
fa08c86b | 1008 | } |
8cd0437d | 1009 | channel_register_cleanup(c->self, session_close_by_channel, 0); |
719fc62f | 1010 | return c; |
e78a59f5 | 1011 | } |
1012 | ||
396c147e | 1013 | static void |
7819b5c3 | 1014 | server_input_channel_open(int type, u_int32_t seq, void *ctxt) |
e78a59f5 | 1015 | { |
1016 | Channel *c = NULL; | |
1017 | char *ctype; | |
e78a59f5 | 1018 | int rchan; |
f91d9a89 | 1019 | u_int rmaxpack, rwindow, len; |
e78a59f5 | 1020 | |
1021 | ctype = packet_get_string(&len); | |
1022 | rchan = packet_get_int(); | |
1023 | rwindow = packet_get_int(); | |
1024 | rmaxpack = packet_get_int(); | |
1025 | ||
188adeb2 | 1026 | debug("server_input_channel_open: ctype %s rchan %d win %d max %d", |
e78a59f5 | 1027 | ctype, rchan, rwindow, rmaxpack); |
1028 | ||
1029 | if (strcmp(ctype, "session") == 0) { | |
43f7a4b8 | 1030 | c = server_request_session(); |
e78a59f5 | 1031 | } else if (strcmp(ctype, "direct-tcpip") == 0) { |
43f7a4b8 | 1032 | c = server_request_direct_tcpip(); |
d20f3c9e | 1033 | } else if (strcmp(ctype, "tun@openssh.com") == 0) { |
1034 | c = server_request_tun(); | |
e78a59f5 | 1035 | } |
1036 | if (c != NULL) { | |
fa08c86b | 1037 | debug("server_input_channel_open: confirm %s", ctype); |
e78a59f5 | 1038 | c->remote_id = rchan; |
1039 | c->remote_window = rwindow; | |
1040 | c->remote_maxpacket = rmaxpack; | |
d18e0850 | 1041 | if (c->type != SSH_CHANNEL_CONNECTING) { |
1042 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1043 | packet_put_int(c->remote_id); | |
1044 | packet_put_int(c->self); | |
1045 | packet_put_int(c->local_window); | |
1046 | packet_put_int(c->local_maxpacket); | |
1047 | packet_send(); | |
1048 | } | |
e78a59f5 | 1049 | } else { |
fa08c86b | 1050 | debug("server_input_channel_open: failure %s", ctype); |
e78a59f5 | 1051 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
1052 | packet_put_int(rchan); | |
1053 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
fbe90f7b | 1054 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
d18e0850 | 1055 | packet_put_cstring("open failed"); |
fbe90f7b | 1056 | packet_put_cstring(""); |
1057 | } | |
e78a59f5 | 1058 | packet_send(); |
1059 | } | |
1060 | xfree(ctype); | |
1061 | } | |
1062 | ||
396c147e | 1063 | static void |
7819b5c3 | 1064 | server_input_global_request(int type, u_int32_t seq, void *ctxt) |
fa08c86b | 1065 | { |
1066 | char *rtype; | |
1067 | int want_reply; | |
1068 | int success = 0; | |
1069 | ||
1070 | rtype = packet_get_string(NULL); | |
1071 | want_reply = packet_get_char(); | |
1072 | debug("server_input_global_request: rtype %s want_reply %d", rtype, want_reply); | |
2b87da3b | 1073 | |
01794848 | 1074 | /* -R style forwarding */ |
fa08c86b | 1075 | if (strcmp(rtype, "tcpip-forward") == 0) { |
1076 | struct passwd *pw; | |
1077 | char *listen_address; | |
1078 | u_short listen_port; | |
1079 | ||
2362db19 | 1080 | pw = the_authctxt->pw; |
95077f48 | 1081 | if (pw == NULL || !the_authctxt->valid) |
fdaef11e | 1082 | fatal("server_input_global_request: no/invalid user"); |
b08a39ff | 1083 | listen_address = packet_get_string(NULL); |
fa08c86b | 1084 | listen_port = (u_short)packet_get_int(); |
1085 | debug("server_input_global_request: tcpip-forward listen %s port %d", | |
1086 | listen_address, listen_port); | |
1087 | ||
1088 | /* check permissions */ | |
1089 | if (!options.allow_tcp_forwarding || | |
e6f15ed1 | 1090 | no_port_forwarding_flag |
1091 | #ifndef NO_IPPORT_RESERVED_CONCEPT | |
1092 | || (listen_port < IPPORT_RESERVED && pw->pw_uid != 0) | |
1093 | #endif | |
98c044d0 | 1094 | ) { |
fa08c86b | 1095 | success = 0; |
1096 | packet_send_debug("Server has disabled port forwarding."); | |
1097 | } else { | |
1098 | /* Start listening on the port */ | |
5641aefa | 1099 | success = channel_setup_remote_fwd_listener( |
1100 | listen_address, listen_port, options.gateway_ports); | |
fa08c86b | 1101 | } |
1102 | xfree(listen_address); | |
d740ec16 | 1103 | } else if (strcmp(rtype, "cancel-tcpip-forward") == 0) { |
1104 | char *cancel_address; | |
1105 | u_short cancel_port; | |
1106 | ||
1107 | cancel_address = packet_get_string(NULL); | |
1108 | cancel_port = (u_short)packet_get_int(); | |
1109 | debug("%s: cancel-tcpip-forward addr %s port %d", __func__, | |
1110 | cancel_address, cancel_port); | |
1111 | ||
1112 | success = channel_cancel_rport_listener(cancel_address, | |
1113 | cancel_port); | |
4113a1d7 | 1114 | xfree(cancel_address); |
fa08c86b | 1115 | } |
1116 | if (want_reply) { | |
1117 | packet_start(success ? | |
1118 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); | |
1119 | packet_send(); | |
1120 | packet_write_wait(); | |
1121 | } | |
1122 | xfree(rtype); | |
1123 | } | |
a7137f6b | 1124 | |
7899c98f | 1125 | static void |
1126 | server_input_channel_req(int type, u_int32_t seq, void *ctxt) | |
1127 | { | |
1128 | Channel *c; | |
1129 | int id, reply, success = 0; | |
1130 | char *rtype; | |
1131 | ||
1132 | id = packet_get_int(); | |
1133 | rtype = packet_get_string(NULL); | |
1134 | reply = packet_get_char(); | |
1135 | ||
1136 | debug("server_input_channel_req: channel %d request %s reply %d", | |
1137 | id, rtype, reply); | |
1138 | ||
1139 | if ((c = channel_lookup(id)) == NULL) | |
1140 | packet_disconnect("server_input_channel_req: " | |
1141 | "unknown channel %d", id); | |
1142 | if (c->type == SSH_CHANNEL_LARVAL || c->type == SSH_CHANNEL_OPEN) | |
1143 | success = session_input_channel_req(c, rtype); | |
1144 | if (reply) { | |
1145 | packet_start(success ? | |
1146 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1147 | packet_put_int(c->remote_id); | |
1148 | packet_send(); | |
1149 | } | |
1150 | xfree(rtype); | |
1151 | } | |
fa08c86b | 1152 | |
396c147e | 1153 | static void |
5ca51e19 | 1154 | server_init_dispatch_20(void) |
e78a59f5 | 1155 | { |
1156 | debug("server_init_dispatch_20"); | |
1157 | dispatch_init(&dispatch_protocol_error); | |
1158 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); | |
1159 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1160 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1161 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
1162 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open); | |
1163 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); | |
1164 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
7899c98f | 1165 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &server_input_channel_req); |
e78a59f5 | 1166 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
fa08c86b | 1167 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request); |
3ffc6336 | 1168 | /* client_alive */ |
95ae2076 | 1169 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_keep_alive); |
1170 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &server_input_keep_alive); | |
1171 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &server_input_keep_alive); | |
7a37c112 | 1172 | /* rekeying */ |
1173 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
e78a59f5 | 1174 | } |
396c147e | 1175 | static void |
5ca51e19 | 1176 | server_init_dispatch_13(void) |
7368a6c8 | 1177 | { |
1178 | debug("server_init_dispatch_13"); | |
1179 | dispatch_init(NULL); | |
1180 | dispatch_set(SSH_CMSG_EOF, &server_input_eof); | |
1181 | dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data); | |
1182 | dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size); | |
1183 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1184 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1185 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
1186 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); | |
1187 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1188 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
1189 | } | |
396c147e | 1190 | static void |
5ca51e19 | 1191 | server_init_dispatch_15(void) |
7368a6c8 | 1192 | { |
1193 | server_init_dispatch_13(); | |
1194 | debug("server_init_dispatch_15"); | |
1195 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1196 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose); | |
1197 | } | |
396c147e | 1198 | static void |
5ca51e19 | 1199 | server_init_dispatch(void) |
7368a6c8 | 1200 | { |
e78a59f5 | 1201 | if (compat20) |
1202 | server_init_dispatch_20(); | |
1203 | else if (compat13) | |
7368a6c8 | 1204 | server_init_dispatch_13(); |
1205 | else | |
1206 | server_init_dispatch_15(); | |
1207 | } |