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serverloop.c

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1/* $OpenBSD: serverloop.c,v 1.209 2018/07/27 05:13:02 dtucker Exp $ */-
2/*-
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>-
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland-
5 * All rights reserved-
6 * Server main loop for handling the interactive session.-
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 *-
14 * SSH2 support by Markus Friedl.-
15 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.-
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.-
36 */-
37-
38#include "includes.h"-
39-
40#include <sys/types.h>-
41#include <sys/wait.h>-
42#include <sys/socket.h>-
43#ifdef HAVE_SYS_TIME_H-
44# include <sys/time.h>-
45#endif-
46-
47#include <netinet/in.h>-
48-
49#include <errno.h>-
50#include <fcntl.h>-
51#include <pwd.h>-
52#include <signal.h>-
53#include <string.h>-
54#include <termios.h>-
55#include <unistd.h>-
56#include <stdarg.h>-
57-
58#include "openbsd-compat/sys-queue.h"-
59#include "xmalloc.h"-
60#include "packet.h"-
61#include "sshbuf.h"-
62#include "log.h"-
63#include "misc.h"-
64#include "servconf.h"-
65#include "canohost.h"-
66#include "sshpty.h"-
67#include "channels.h"-
68#include "compat.h"-
69#include "ssh2.h"-
70#include "sshkey.h"-
71#include "cipher.h"-
72#include "kex.h"-
73#include "hostfile.h"-
74#include "auth.h"-
75#include "session.h"-
76#include "dispatch.h"-
77#include "auth-options.h"-
78#include "serverloop.h"-
79#include "ssherr.h"-
80-
81extern ServerOptions options;-
82-
83/* XXX */-
84extern Authctxt *the_authctxt;-
85extern struct sshauthopt *auth_opts;-
86extern int use_privsep;-
87-
88static int no_more_sessions = 0; /* Disallow further sessions. */-
89-
90/*-
91 * This SIGCHLD kludge is used to detect when the child exits. The server-
92 * will exit after that, as soon as forwarded connections have terminated.-
93 */-
94-
95static volatile sig_atomic_t child_terminated = 0; /* The child has terminated. */-
96-
97/* Cleanup on signals (!use_privsep case only) */-
98static volatile sig_atomic_t received_sigterm = 0;-
99-
100/* prototypes */-
101static void server_init_dispatch(void);-
102-
103/* requested tunnel forwarding interface(s), shared with session.c */-
104char *tun_fwd_ifnames = NULL;-
105-
106/* returns 1 if bind to specified port by specified user is permitted */-
107static int-
108bind_permitted(int port, uid_t uid)-
109{-
110 if (use_privsep)
use_privsepDescription
TRUEnever evaluated
FALSEnever evaluated
0
111 return 1; /* allow system to decide */
never executed: return 1;
0
112 if (port < IPPORT_RESERVED && uid != 0)
port < 1024Description
TRUEnever evaluated
FALSEnever evaluated
uid != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
113 return 0;
never executed: return 0;
0
114 return 1;
never executed: return 1;
0
115}-
116-
117/*-
118 * we write to this pipe if a SIGCHLD is caught in order to avoid-
119 * the race between select() and child_terminated-
120 */-
121static int notify_pipe[2];-
122static void-
123notify_setup(void)-
124{-
125 if (pipe(notify_pipe) < 0) {
pipe(notify_pipe) < 0Description
TRUEnever evaluated
FALSEnever evaluated
0
126 error("pipe(notify_pipe) failed %s", strerror(errno));-
127 } else if ((fcntl(notify_pipe[0], F_SETFD, FD_CLOEXEC) == -1) ||
never executed: end of block
(fcntl(notify_...2 , 1 ) == -1)Description
TRUEnever evaluated
FALSEnever evaluated
0
128 (fcntl(notify_pipe[1], F_SETFD, FD_CLOEXEC) == -1)) {
(fcntl(notify_...2 , 1 ) == -1)Description
TRUEnever evaluated
FALSEnever evaluated
0
129 error("fcntl(notify_pipe, F_SETFD) failed %s", strerror(errno));-
130 close(notify_pipe[0]);-
131 close(notify_pipe[1]);-
132 } else {
never executed: end of block
0
133 set_nonblock(notify_pipe[0]);-
134 set_nonblock(notify_pipe[1]);-
135 return;
never executed: return;
0
136 }-
137 notify_pipe[0] = -1; /* read end */-
138 notify_pipe[1] = -1; /* write end */-
139}
never executed: end of block
0
140static void-
141notify_parent(void)-
142{-
143 if (notify_pipe[1] != -1)
notify_pipe[1] != -1Description
TRUEnever evaluated
FALSEnever evaluated
0
144 (void)write(notify_pipe[1], "", 1);
never executed: (void)write(notify_pipe[1], "", 1);
0
145}
never executed: end of block
0
146static void-
147notify_prepare(fd_set *readset)-
148{-
149 if (notify_pipe[0] != -1)
notify_pipe[0] != -1Description
TRUEnever evaluated
FALSEnever evaluated
0
150 FD_SET(notify_pipe[0], readset);
never executed: kludge_FD_SET(notify_pipe[0], readset);
0
151}
never executed: end of block
0
152static void-
153notify_done(fd_set *readset)-
154{-
155 char c;-
156-
157 if (notify_pipe[0] != -1 && FD_ISSET(notify_pipe[0], readset))
notify_pipe[0] != -1Description
TRUEnever evaluated
FALSEnever evaluated
kludge_FD_ISSE...e[0], readset)Description
TRUEnever evaluated
FALSEnever evaluated
0
158 while (read(notify_pipe[0], &c, 1) != -1)
read(notify_pi..., &c, 1) != -1Description
TRUEnever evaluated
FALSEnever evaluated
0
159 debug2("%s: reading", __func__);
never executed: debug2("%s: reading", __func__);
0
160}
never executed: end of block
0
161-
162/*ARGSUSED*/-
163static void-
164sigchld_handler(int sig)-
165{-
166 int save_errno = errno;-
167 child_terminated = 1;-
168 notify_parent();-
169 errno = save_errno;-
170}
never executed: end of block
0
171-
172/*ARGSUSED*/-
173static void-
174sigterm_handler(int sig)-
175{-
176 received_sigterm = sig;-
177}
never executed: end of block
0
178-
179static void-
180client_alive_check(struct ssh *ssh)-
181{-
182 int channel_id;-
183 char remote_id[512];-
184-
185 /* timeout, check to see how many we have had */-
186 if (packet_inc_alive_timeouts() > options.client_alive_count_max) {
ssh_packet_inc...live_count_maxDescription
TRUEnever evaluated
FALSEnever evaluated
0
187 sshpkt_fmt_connection_id(ssh, remote_id, sizeof(remote_id));-
188 logit("Timeout, client not responding from %s", remote_id);-
189 cleanup_exit(255);-
190 }
never executed: end of block
0
191-
192 /*-
193 * send a bogus global/channel request with "wantreply",-
194 * we should get back a failure-
195 */-
196 if ((channel_id = channel_find_open(ssh)) == -1) {
(channel_id = ...en(ssh)) == -1Description
TRUEnever evaluated
FALSEnever evaluated
0
197 packet_start(SSH2_MSG_GLOBAL_REQUEST);-
198 packet_put_cstring("keepalive@openssh.com");-
199 packet_put_char(1); /* boolean: want reply */-
200 } else {
never executed: end of block
0
201 channel_request_start(ssh, channel_id,-
202 "keepalive@openssh.com", 1);-
203 }
never executed: end of block
0
204 packet_send();-
205}
never executed: end of block
0
206-
207/*-
208 * Sleep in select() until we can do something. This will initialize the-
209 * select masks. Upon return, the masks will indicate which descriptors-
210 * have data or can accept data. Optionally, a maximum time can be specified-
211 * for the duration of the wait (0 = infinite).-
212 */-
213static void-
214wait_until_can_do_something(struct ssh *ssh,-
215 int connection_in, int connection_out,-
216 fd_set **readsetp, fd_set **writesetp, int *maxfdp,-
217 u_int *nallocp, u_int64_t max_time_ms)-
218{-
219 struct timeval tv, *tvp;-
220 int ret;-
221 time_t minwait_secs = 0;-
222 int client_alive_scheduled = 0;-
223 static time_t last_client_time;-
224-
225 /* Allocate and update select() masks for channel descriptors. */-
226 channel_prepare_select(ssh, readsetp, writesetp, maxfdp,-
227 nallocp, &minwait_secs);-
228-
229 /* XXX need proper deadline system for rekey/client alive */-
230 if (minwait_secs != 0)
minwait_secs != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
231 max_time_ms = MINIMUM(max_time_ms, (u_int)minwait_secs * 1000);
never executed: max_time_ms = (((max_time_ms) < ((u_int)minwait_secs * 1000)) ? (max_time_ms) : ((u_int)minwait_secs * 1000));
((max_time_ms)..._secs * 1000))Description
TRUEnever evaluated
FALSEnever evaluated
0
232-
233 /*-
234 * if using client_alive, set the max timeout accordingly,-
235 * and indicate that this particular timeout was for client-
236 * alive by setting the client_alive_scheduled flag.-
237 *-
238 * this could be randomized somewhat to make traffic-
239 * analysis more difficult, but we're not doing it yet.-
240 */-
241 if (options.client_alive_interval) {
options.client_alive_intervalDescription
TRUEnever evaluated
FALSEnever evaluated
0
242 uint64_t keepalive_ms =-
243 (uint64_t)options.client_alive_interval * 1000;-
244-
245 client_alive_scheduled = 1;-
246 if (max_time_ms == 0 || max_time_ms > keepalive_ms)
max_time_ms == 0Description
TRUEnever evaluated
FALSEnever evaluated
max_time_ms > keepalive_msDescription
TRUEnever evaluated
FALSEnever evaluated
0
247 max_time_ms = keepalive_ms;
never executed: max_time_ms = keepalive_ms;
0
248 }
never executed: end of block
0
249-
250#if 0-
251 /* wrong: bad condition XXX */-
252 if (channel_not_very_much_buffered_data())-
253#endif-
254 FD_SET(connection_in, *readsetp);-
255 notify_prepare(*readsetp);-
256-
257 /*-
258 * If we have buffered packet data going to the client, mark that-
259 * descriptor.-
260 */-
261 if (packet_have_data_to_write())
ssh_packet_hav...(active_state)Description
TRUEnever evaluated
FALSEnever evaluated
0
262 FD_SET(connection_out, *writesetp);
never executed: kludge_FD_SET(connection_out, *writesetp);
0
263-
264 /*-
265 * If child has terminated and there is enough buffer space to read-
266 * from it, then read as much as is available and exit.-
267 */-
268 if (child_terminated && packet_not_very_much_data_to_write())
child_terminatedDescription
TRUEnever evaluated
FALSEnever evaluated
ssh_packet_not...(active_state)Description
TRUEnever evaluated
FALSEnever evaluated
0
269 if (max_time_ms == 0 || client_alive_scheduled)
max_time_ms == 0Description
TRUEnever evaluated
FALSEnever evaluated
client_alive_scheduledDescription
TRUEnever evaluated
FALSEnever evaluated
0
270 max_time_ms = 100;
never executed: max_time_ms = 100;
0
271-
272 if (max_time_ms == 0)
max_time_ms == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
273 tvp = NULL;
never executed: tvp = ((void *)0) ;
0
274 else {-
275 tv.tv_sec = max_time_ms / 1000;-
276 tv.tv_usec = 1000 * (max_time_ms % 1000);-
277 tvp = &tv;-
278 }
never executed: end of block
0
279-
280 /* Wait for something to happen, or the timeout to expire. */-
281 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);-
282-
283 if (ret == -1) {
ret == -1Description
TRUEnever evaluated
FALSEnever evaluated
0
284 memset(*readsetp, 0, *nallocp);-
285 memset(*writesetp, 0, *nallocp);-
286 if (errno != EINTR)
(*__errno_location ()) != 4Description
TRUEnever evaluated
FALSEnever evaluated
0
287 error("select: %.100s", strerror(errno));
never executed: error("select: %.100s", strerror( (*__errno_location ()) ));
0
288 } else if (client_alive_scheduled) {
never executed: end of block
client_alive_scheduledDescription
TRUEnever evaluated
FALSEnever evaluated
0
289 time_t now = monotime();-
290-
291 if (ret == 0) { /* timeout */
ret == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
292 client_alive_check(ssh);-
293 } else if (FD_ISSET(connection_in, *readsetp)) {
never executed: end of block
kludge_FD_ISSE...in, *readsetp)Description
TRUEnever evaluated
FALSEnever evaluated
0
294 last_client_time = now;-
295 } else if (last_client_time != 0 && last_client_time +
never executed: end of block
last_client_time != 0Description
TRUEnever evaluated
FALSEnever evaluated
last_client_ti...nterval <= nowDescription
TRUEnever evaluated
FALSEnever evaluated
0
296 options.client_alive_interval <= now) {
last_client_ti...nterval <= nowDescription
TRUEnever evaluated
FALSEnever evaluated
0
297 client_alive_check(ssh);-
298 last_client_time = now;-
299 }
never executed: end of block
0
300 }
never executed: end of block
0
301-
302 notify_done(*readsetp);-
303}
never executed: end of block
0
304-
305/*-
306 * Processes input from the client and the program. Input data is stored-
307 * in buffers and processed later.-
308 */-
309static int-
310process_input(struct ssh *ssh, fd_set *readset, int connection_in)-
311{-
312 int len;-
313 char buf[16384];-
314-
315 /* Read and buffer any input data from the client. */-
316 if (FD_ISSET(connection_in, readset)) {
kludge_FD_ISSE...n_in, readset)Description
TRUEnever evaluated
FALSEnever evaluated
0
317 len = read(connection_in, buf, sizeof(buf));-
318 if (len == 0) {
len == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
319 verbose("Connection closed by %.100s port %d",-
320 ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));-
321 return -1;
never executed: return -1;
0
322 } else if (len < 0) {
len < 0Description
TRUEnever evaluated
FALSEnever evaluated
0
323 if (errno != EINTR && errno != EAGAIN &&
(*__errno_location ()) != 4Description
TRUEnever evaluated
FALSEnever evaluated
(*__errno_location ()) != 11Description
TRUEnever evaluated
FALSEnever evaluated
0
324 errno != EWOULDBLOCK) {
(*__errno_location ()) != 11Description
TRUEnever evaluated
FALSEnever evaluated
0
325 verbose("Read error from remote host "-
326 "%.100s port %d: %.100s",-
327 ssh_remote_ipaddr(ssh),-
328 ssh_remote_port(ssh), strerror(errno));-
329 cleanup_exit(255);-
330 }
never executed: end of block
0
331 } else {
never executed: end of block
0
332 /* Buffer any received data. */-
333 packet_process_incoming(buf, len);-
334 }
never executed: end of block
0
335 }-
336 return 0;
never executed: return 0;
0
337}-
338-
339/*-
340 * Sends data from internal buffers to client program stdin.-
341 */-
342static void-
343process_output(fd_set *writeset, int connection_out)-
344{-
345 /* Send any buffered packet data to the client. */-
346 if (FD_ISSET(connection_out, writeset))
kludge_FD_ISSE...out, writeset)Description
TRUEnever evaluated
FALSEnever evaluated
0
347 packet_write_poll();
never executed: packet_write_poll();
0
348}
never executed: end of block
0
349-
350static void-
351process_buffered_input_packets(struct ssh *ssh)-
352{-
353 ssh_dispatch_run_fatal(ssh, DISPATCH_NONBLOCK, NULL);-
354}
never executed: end of block
0
355-
356static void-
357collect_children(struct ssh *ssh)-
358{-
359 pid_t pid;-
360 sigset_t oset, nset;-
361 int status;-
362-
363 /* block SIGCHLD while we check for dead children */-
364 sigemptyset(&nset);-
365 sigaddset(&nset, SIGCHLD);-
366 sigprocmask(SIG_BLOCK, &nset, &oset);-
367 if (child_terminated) {
child_terminatedDescription
TRUEnever evaluated
FALSEnever evaluated
0
368 debug("Received SIGCHLD.");-
369 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
(pid = waitpid...atus, 1 )) > 0Description
TRUEnever evaluated
FALSEnever evaluated
0
370 (pid < 0 && errno == EINTR))
pid < 0Description
TRUEnever evaluated
FALSEnever evaluated
(*__errno_location ()) == 4Description
TRUEnever evaluated
FALSEnever evaluated
0
371 if (pid > 0)
pid > 0Description
TRUEnever evaluated
FALSEnever evaluated
0
372 session_close_by_pid(ssh, pid, status);
never executed: session_close_by_pid(ssh, pid, status);
0
373 child_terminated = 0;-
374 }
never executed: end of block
0
375 sigprocmask(SIG_SETMASK, &oset, NULL);-
376}
never executed: end of block
0
377-
378void-
379server_loop2(struct ssh *ssh, Authctxt *authctxt)-
380{-
381 fd_set *readset = NULL, *writeset = NULL;-
382 int max_fd;-
383 u_int nalloc = 0, connection_in, connection_out;-
384 u_int64_t rekey_timeout_ms = 0;-
385-
386 debug("Entering interactive session for SSH2.");-
387-
388 signal(SIGCHLD, sigchld_handler);-
389 child_terminated = 0;-
390 connection_in = packet_get_connection_in();-
391 connection_out = packet_get_connection_out();-
392-
393 if (!use_privsep) {
!use_privsepDescription
TRUEnever evaluated
FALSEnever evaluated
0
394 signal(SIGTERM, sigterm_handler);-
395 signal(SIGINT, sigterm_handler);-
396 signal(SIGQUIT, sigterm_handler);-
397 }
never executed: end of block
0
398-
399 notify_setup();-
400-
401 max_fd = MAXIMUM(connection_in, connection_out);
((connection_i...nnection_out))Description
TRUEnever evaluated
FALSEnever evaluated
0
402 max_fd = MAXIMUM(max_fd, notify_pipe[0]);
((max_fd) > (notify_pipe[0]))Description
TRUEnever evaluated
FALSEnever evaluated
0
403-
404 server_init_dispatch();-
405-
406 for (;;) {-
407 process_buffered_input_packets(ssh);-
408-
409 if (!ssh_packet_is_rekeying(ssh) &&
!ssh_packet_is_rekeying(ssh)Description
TRUEnever evaluated
FALSEnever evaluated
0
410 packet_not_very_much_data_to_write())
ssh_packet_not...(active_state)Description
TRUEnever evaluated
FALSEnever evaluated
0
411 channel_output_poll(ssh);
never executed: channel_output_poll(ssh);
0
412 if (options.rekey_interval > 0 && !ssh_packet_is_rekeying(ssh))
options.rekey_interval > 0Description
TRUEnever evaluated
FALSEnever evaluated
!ssh_packet_is_rekeying(ssh)Description
TRUEnever evaluated
FALSEnever evaluated
0
413 rekey_timeout_ms = packet_get_rekey_timeout() * 1000;
never executed: rekey_timeout_ms = ssh_packet_get_rekey_timeout(active_state) * 1000;
0
414 else-
415 rekey_timeout_ms = 0;
never executed: rekey_timeout_ms = 0;
0
416-
417 wait_until_can_do_something(ssh, connection_in, connection_out,-
418 &readset, &writeset, &max_fd, &nalloc, rekey_timeout_ms);-
419-
420 if (received_sigterm) {
received_sigtermDescription
TRUEnever evaluated
FALSEnever evaluated
0
421 logit("Exiting on signal %d", (int)received_sigterm);-
422 /* Clean up sessions, utmp, etc. */-
423 cleanup_exit(255);-
424 }
never executed: end of block
0
425-
426 collect_children(ssh);-
427 if (!ssh_packet_is_rekeying(ssh))
!ssh_packet_is_rekeying(ssh)Description
TRUEnever evaluated
FALSEnever evaluated
0
428 channel_after_select(ssh, readset, writeset);
never executed: channel_after_select(ssh, readset, writeset);
0
429 if (process_input(ssh, readset, connection_in) < 0)
process_input(...ection_in) < 0Description
TRUEnever evaluated
FALSEnever evaluated
0
430 break;
never executed: break;
0
431 process_output(writeset, connection_out);-
432 }
never executed: end of block
0
433 collect_children(ssh);-
434-
435 free(readset);-
436 free(writeset);-
437-
438 /* free all channels, no more reads and writes */-
439 channel_free_all(ssh);-
440-
441 /* free remaining sessions, e.g. remove wtmp entries */-
442 session_destroy_all(ssh, NULL);-
443}
never executed: end of block
0
444-
445static int-
446server_input_keep_alive(int type, u_int32_t seq, struct ssh *ssh)-
447{-
448 debug("Got %d/%u for keepalive", type, seq);-
449 /*-
450 * reset timeout, since we got a sane answer from the client.-
451 * even if this was generated by something other than-
452 * the bogus CHANNEL_REQUEST we send for keepalives.-
453 */-
454 packet_set_alive_timeouts(0);-
455 return 0;
never executed: return 0;
0
456}-
457-
458static Channel *-
459server_request_direct_tcpip(struct ssh *ssh, int *reason, const char **errmsg)-
460{-
461 Channel *c = NULL;-
462 char *target, *originator;-
463 u_short target_port, originator_port;-
464-
465 target = packet_get_string(NULL);-
466 target_port = packet_get_int();-
467 originator = packet_get_string(NULL);-
468 originator_port = packet_get_int();-
469 packet_check_eom();
never executed: end of block
_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
0
470-
471 debug("%s: originator %s port %d, target %s port %d", __func__,-
472 originator, originator_port, target, target_port);-
473-
474 /* XXX fine grained permissions */-
475 if ((options.allow_tcp_forwarding & FORWARD_LOCAL) != 0 &&
(options.allow...& (1<<1)) != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
476 auth_opts->permit_port_forwarding_flag &&
auth_opts->per...orwarding_flagDescription
TRUEnever evaluated
FALSEnever evaluated
0
477 !options.disable_forwarding) {
!options.disable_forwardingDescription
TRUEnever evaluated
FALSEnever evaluated
0
478 c = channel_connect_to_port(ssh, target, target_port,-
479 "direct-tcpip", "direct-tcpip", reason, errmsg);-
480 } else {
never executed: end of block
0
481 logit("refused local port forward: "-
482 "originator %s port %d, target %s port %d",-
483 originator, originator_port, target, target_port);-
484 if (reason != NULL)
reason != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
485 *reason = SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED;
never executed: *reason = 1;
0
486 }
never executed: end of block
0
487-
488 free(originator);-
489 free(target);-
490-
491 return c;
never executed: return c;
0
492}-
493-
494static Channel *-
495server_request_direct_streamlocal(struct ssh *ssh)-
496{-
497 Channel *c = NULL;-
498 char *target, *originator;-
499 u_short originator_port;-
500 struct passwd *pw = the_authctxt->pw;-
501-
502 if (pw == NULL || !the_authctxt->valid)
pw == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
!the_authctxt->validDescription
TRUEnever evaluated
FALSEnever evaluated
0
503 fatal("%s: no/invalid user", __func__);
never executed: fatal("%s: no/invalid user", __func__);
0
504-
505 target = packet_get_string(NULL);-
506 originator = packet_get_string(NULL);-
507 originator_port = packet_get_int();-
508 packet_check_eom();
never executed: end of block
_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
0
509-
510 debug("%s: originator %s port %d, target %s", __func__,-
511 originator, originator_port, target);-
512-
513 /* XXX fine grained permissions */-
514 if ((options.allow_streamlocal_forwarding & FORWARD_LOCAL) != 0 &&
(options.allow...& (1<<1)) != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
515 auth_opts->permit_port_forwarding_flag &&
auth_opts->per...orwarding_flagDescription
TRUEnever evaluated
FALSEnever evaluated
0
516 !options.disable_forwarding && (pw->pw_uid == 0 || use_privsep)) {
!options.disable_forwardingDescription
TRUEnever evaluated
FALSEnever evaluated
pw->pw_uid == 0Description
TRUEnever evaluated
FALSEnever evaluated
use_privsepDescription
TRUEnever evaluated
FALSEnever evaluated
0
517 c = channel_connect_to_path(ssh, target,-
518 "direct-streamlocal@openssh.com", "direct-streamlocal");-
519 } else {
never executed: end of block
0
520 logit("refused streamlocal port forward: "-
521 "originator %s port %d, target %s",-
522 originator, originator_port, target);-
523 }
never executed: end of block
0
524-
525 free(originator);-
526 free(target);-
527-
528 return c;
never executed: return c;
0
529}-
530-
531static Channel *-
532server_request_tun(struct ssh *ssh)-
533{-
534 Channel *c = NULL;-
535 int mode, tun, sock;-
536 char *tmp, *ifname = NULL;-
537-
538 mode = packet_get_int();-
539 switch (mode) {-
540 case SSH_TUNMODE_POINTOPOINT:
never executed: case 0x01:
0
541 case SSH_TUNMODE_ETHERNET:
never executed: case 0x02:
0
542 break;
never executed: break;
0
543 default:
never executed: default:
0
544 packet_send_debug("Unsupported tunnel device mode.");-
545 return NULL;
never executed: return ((void *)0) ;
0
546 }-
547 if ((options.permit_tun & mode) == 0) {
(options.permi...n & mode) == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
548 packet_send_debug("Server has rejected tunnel device "-
549 "forwarding");-
550 return NULL;
never executed: return ((void *)0) ;
0
551 }-
552-
553 tun = packet_get_int();-
554 if (auth_opts->force_tun_device != -1) {
auth_opts->for...n_device != -1Description
TRUEnever evaluated
FALSEnever evaluated
0
555 if (tun != SSH_TUNID_ANY && auth_opts->force_tun_device != tun)
tun != 0x7fffffffDescription
TRUEnever evaluated
FALSEnever evaluated
auth_opts->for..._device != tunDescription
TRUEnever evaluated
FALSEnever evaluated
0
556 goto done;
never executed: goto done;
0
557 tun = auth_opts->force_tun_device;-
558 }
never executed: end of block
0
559 sock = tun_open(tun, mode, &ifname);-
560 if (sock < 0)
sock < 0Description
TRUEnever evaluated
FALSEnever evaluated
0
561 goto done;
never executed: goto done;
0
562 debug("Tunnel forwarding using interface %s", ifname);-
563-
564 c = channel_new(ssh, "tun", SSH_CHANNEL_OPEN, sock, sock, -1,-
565 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);-
566 c->datagram = 1;-
567#if defined(SSH_TUN_FILTER)-
568 if (mode == SSH_TUNMODE_POINTOPOINT)
mode == 0x01Description
TRUEnever evaluated
FALSEnever evaluated
0
569 channel_register_filter(ssh, c->self, sys_tun_infilter,
never executed: channel_register_filter(ssh, c->self, sys_tun_infilter, sys_tun_outfilter, ((void *)0) , ((void *)0) );
0
570 sys_tun_outfilter, NULL, NULL);
never executed: channel_register_filter(ssh, c->self, sys_tun_infilter, sys_tun_outfilter, ((void *)0) , ((void *)0) );
0
571#endif-
572-
573 /*-
574 * Update the list of names exposed to the session-
575 * XXX remove these if the tunnels are closed (won't matter-
576 * much if they are already in the environment though)-
577 */-
578 tmp = tun_fwd_ifnames;-
579 xasprintf(&tun_fwd_ifnames, "%s%s%s",-
580 tun_fwd_ifnames == NULL ? "" : tun_fwd_ifnames,-
581 tun_fwd_ifnames == NULL ? "" : ",",-
582 ifname);-
583 free(tmp);-
584 free(ifname);-
585-
586 done:
code before this statement never executed: done:
0
587 if (c == NULL)
c == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
588 packet_send_debug("Failed to open the tunnel device.");
never executed: packet_send_debug("Failed to open the tunnel device.");
0
589 return c;
never executed: return c;
0
590}-
591-
592static Channel *-
593server_request_session(struct ssh *ssh)-
594{-
595 Channel *c;-
596-
597 debug("input_session_request");-
598 packet_check_eom();
never executed: end of block
_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
0
599-
600 if (no_more_sessions) {
no_more_sessionsDescription
TRUEnever evaluated
FALSEnever evaluated
0
601 packet_disconnect("Possible attack: attempt to open a session "-
602 "after additional sessions disabled");-
603 }
never executed: end of block
0
604-
605 /*-
606 * A server session has no fd to read or write until a-
607 * CHANNEL_REQUEST for a shell is made, so we set the type to-
608 * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all-
609 * CHANNEL_REQUEST messages is registered.-
610 */-
611 c = channel_new(ssh, "session", SSH_CHANNEL_LARVAL,-
612 -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT,-
613 0, "server-session", 1);-
614 if (session_open(the_authctxt, c->self) != 1) {
session_open(t... c->self) != 1Description
TRUEnever evaluated
FALSEnever evaluated
0
615 debug("session open failed, free channel %d", c->self);-
616 channel_free(ssh, c);-
617 return NULL;
never executed: return ((void *)0) ;
0
618 }-
619 channel_register_cleanup(ssh, c->self, session_close_by_channel, 0);-
620 return c;
never executed: return c;
0
621}-
622-
623static int-
624server_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)-
625{-
626 Channel *c = NULL;-
627 char *ctype;-
628 const char *errmsg = NULL;-
629 int rchan, reason = SSH2_OPEN_CONNECT_FAILED;-
630 u_int rmaxpack, rwindow, len;-
631-
632 ctype = packet_get_string(&len);-
633 rchan = packet_get_int();-
634 rwindow = packet_get_int();-
635 rmaxpack = packet_get_int();-
636-
637 debug("%s: ctype %s rchan %d win %d max %d", __func__,-
638 ctype, rchan, rwindow, rmaxpack);-
639-
640 if (strcmp(ctype, "session") == 0) {
never executed: __result = (((const unsigned char *) (const char *) ( ctype ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( "session" ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
__extension__ ... )))); }) == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
641 c = server_request_session(ssh);-
642 } else if (strcmp(ctype, "direct-tcpip") == 0) {
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( ctype ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( "direct-tcpip" ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
__extension__ ... )))); }) == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
643 c = server_request_direct_tcpip(ssh, &reason, &errmsg);-
644 } else if (strcmp(ctype, "direct-streamlocal@openssh.com") == 0) {
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( ctype ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( "direct-streamlocal@openssh.com" ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
__extension__ ... )))); }) == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
645 c = server_request_direct_streamlocal(ssh);-
646 } else if (strcmp(ctype, "tun@openssh.com") == 0) {
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( ctype ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( "tun@openssh.com" ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
__extension__ ... )))); }) == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
647 c = server_request_tun(ssh);-
648 }
never executed: end of block
0
649 if (c != NULL) {
c != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
650 debug("%s: confirm %s", __func__, ctype);-
651 c->remote_id = rchan;-
652 c->have_remote_id = 1;-
653 c->remote_window = rwindow;-
654 c->remote_maxpacket = rmaxpack;-
655 if (c->type != SSH_CHANNEL_CONNECTING) {
c->type != 12Description
TRUEnever evaluated
FALSEnever evaluated
0
656 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);-
657 packet_put_int(c->remote_id);-
658 packet_put_int(c->self);-
659 packet_put_int(c->local_window);-
660 packet_put_int(c->local_maxpacket);-
661 packet_send();-
662 }
never executed: end of block
0
663 } else {
never executed: end of block
0
664 debug("%s: failure %s", __func__, ctype);-
665 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);-
666 packet_put_int(rchan);-
667 packet_put_int(reason);-
668 packet_put_cstring(errmsg ? errmsg : "open failed");-
669 packet_put_cstring("");-
670 packet_send();-
671 }
never executed: end of block
0
672 free(ctype);-
673 return 0;
never executed: return 0;
0
674}-
675-
676static int-
677server_input_hostkeys_prove(struct ssh *ssh, struct sshbuf **respp)-
678{-
679 struct sshbuf *resp = NULL;-
680 struct sshbuf *sigbuf = NULL;-
681 struct sshkey *key = NULL, *key_pub = NULL, *key_prv = NULL;-
682 int r, ndx, kexsigtype, use_kexsigtype, success = 0;-
683 const u_char *blob;-
684 u_char *sig = 0;-
685 size_t blen, slen;-
686-
687 if ((resp = sshbuf_new()) == NULL || (sigbuf = sshbuf_new()) == NULL)
(resp = sshbuf...== ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
(sigbuf = sshb...== ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
688 fatal("%s: sshbuf_new", __func__);
never executed: fatal("%s: sshbuf_new", __func__);
0
689-
690 kexsigtype = sshkey_type_plain(-
691 sshkey_type_from_name(ssh->kex->hostkey_alg));-
692 while (ssh_packet_remaining(ssh) > 0) {
ssh_packet_remaining(ssh) > 0Description
TRUEnever evaluated
FALSEnever evaluated
0
693 sshkey_free(key);-
694 key = NULL;-
695 if ((r = sshpkt_get_string_direct(ssh, &blob, &blen)) != 0 ||
(r = sshpkt_ge..., &blen)) != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
696 (r = sshkey_from_blob(blob, blen, &key)) != 0) {
(r = sshkey_fr...n, &key)) != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
697 error("%s: couldn't parse key: %s",-
698 __func__, ssh_err(r));-
699 goto out;
never executed: goto out;
0
700 }-
701 /*-
702 * Better check that this is actually one of our hostkeys-
703 * before attempting to sign anything with it.-
704 */-
705 if ((ndx = ssh->kex->host_key_index(key, 1, ssh)) == -1) {
(ndx = ssh->ke...1, ssh)) == -1Description
TRUEnever evaluated
FALSEnever evaluated
0
706 error("%s: unknown host %s key",-
707 __func__, sshkey_type(key));-
708 goto out;
never executed: goto out;
0
709 }-
710 /*-
711 * XXX refactor: make kex->sign just use an index rather-
712 * than passing in public and private keys-
713 */-
714 if ((key_prv = get_hostkey_by_index(ndx)) == NULL &&
(key_prv = get...== ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
715 (key_pub = get_hostkey_public_by_index(ndx, ssh)) == NULL) {
(key_pub = get...== ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
716 error("%s: can't retrieve hostkey %d", __func__, ndx);-
717 goto out;
never executed: goto out;
0
718 }-
719 sshbuf_reset(sigbuf);-
720 free(sig);-
721 sig = NULL;-
722 /*-
723 * For RSA keys, prefer to use the signature type negotiated-
724 * during KEX to the default (SHA1).-
725 */-
726 use_kexsigtype = kexsigtype == KEY_RSA &&
kexsigtype == KEY_RSADescription
TRUEnever evaluated
FALSEnever evaluated
0
727 sshkey_type_plain(key->type) == KEY_RSA;
sshkey_type_pl...pe) == KEY_RSADescription
TRUEnever evaluated
FALSEnever evaluated
0
728 if ((r = sshbuf_put_cstring(sigbuf,
(r = sshbuf_pu...sh.com")) != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
729 "hostkeys-prove-00@openssh.com")) != 0 ||
(r = sshbuf_pu...sh.com")) != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
730 (r = sshbuf_put_string(sigbuf,
(r = sshbuf_pu..._id_len)) != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
731 ssh->kex->session_id, ssh->kex->session_id_len)) != 0 ||
(r = sshbuf_pu..._id_len)) != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
732 (r = sshkey_puts(key, sigbuf)) != 0 ||
(r = sshkey_pu... sigbuf)) != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
733 (r = ssh->kex->sign(key_prv, key_pub, &sig, &slen,
(r = ssh->kex-...)0) , 0)) != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
734 sshbuf_ptr(sigbuf), sshbuf_len(sigbuf),
(r = ssh->kex-...)0) , 0)) != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
735 use_kexsigtype ? ssh->kex->hostkey_alg : NULL, 0)) != 0 ||
(r = ssh->kex-...)0) , 0)) != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
736 (r = sshbuf_put_string(resp, sig, slen)) != 0) {
(r = sshbuf_pu...g, slen)) != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
737 error("%s: couldn't prepare signature: %s",-
738 __func__, ssh_err(r));-
739 goto out;
never executed: goto out;
0
740 }-
741 }
never executed: end of block
0
742 /* Success */-
743 *respp = resp;-
744 resp = NULL; /* don't free it */-
745 success = 1;-
746 out:
code before this statement never executed: out:
0
747 free(sig);-
748 sshbuf_free(resp);-
749 sshbuf_free(sigbuf);-
750 sshkey_free(key);-
751 return success;
never executed: return success;
0
752}-
753-
754static int-
755server_input_global_request(int type, u_int32_t seq, struct ssh *ssh)-
756{-
757 char *rtype;-
758 int want_reply;-
759 int r, success = 0, allocated_listen_port = 0;-
760 struct sshbuf *resp = NULL;-
761 struct passwd *pw = the_authctxt->pw;-
762-
763 if (pw == NULL || !the_authctxt->valid)
pw == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
!the_authctxt->validDescription
TRUEnever evaluated
FALSEnever evaluated
0
764 fatal("%s: no/invalid user", __func__);
never executed: fatal("%s: no/invalid user", __func__);
0
765-
766 rtype = packet_get_string(NULL);-
767 want_reply = packet_get_char();-
768 debug("%s: rtype %s want_reply %d", __func__, rtype, want_reply);-
769-
770 /* -R style forwarding */-
771 if (strcmp(rtype, "tcpip-forward") == 0) {
never executed: __result = (((const unsigned char *) (const char *) ( rtype ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( "tcpip-forward" ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
__extension__ ... )))); }) == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
772 struct Forward fwd;-
773-
774 memset(&fwd, 0, sizeof(fwd));-
775 fwd.listen_host = packet_get_string(NULL);-
776 fwd.listen_port = (u_short)packet_get_int();-
777 debug("%s: tcpip-forward listen %s port %d", __func__,-
778 fwd.listen_host, fwd.listen_port);-
779-
780 /* check permissions */-
781 if ((options.allow_tcp_forwarding & FORWARD_REMOTE) == 0 ||
(options.allow...ng & (1)) == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
782 !auth_opts->permit_port_forwarding_flag ||
!auth_opts->pe...orwarding_flagDescription
TRUEnever evaluated
FALSEnever evaluated
0
783 options.disable_forwarding ||
options.disable_forwardingDescription
TRUEnever evaluated
FALSEnever evaluated
0
784 (!want_reply && fwd.listen_port == 0) ||
!want_replyDescription
TRUEnever evaluated
FALSEnever evaluated
fwd.listen_port == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
785 (fwd.listen_port != 0 &&
fwd.listen_port != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
786 !bind_permitted(fwd.listen_port, pw->pw_uid))) {
!bind_permitte...t, pw->pw_uid)Description
TRUEnever evaluated
FALSEnever evaluated
0
787 success = 0;-
788 packet_send_debug("Server has disabled port forwarding.");-
789 } else {
never executed: end of block
0
790 /* Start listening on the port */-
791 success = channel_setup_remote_fwd_listener(ssh, &fwd,-
792 &allocated_listen_port, &options.fwd_opts);-
793 }
never executed: end of block
0
794 free(fwd.listen_host);-
795 if ((resp = sshbuf_new()) == NULL)
(resp = sshbuf...== ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
796 fatal("%s: sshbuf_new", __func__);
never executed: fatal("%s: sshbuf_new", __func__);
0
797 if (allocated_listen_port != 0 &&
allocated_listen_port != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
798 (r = sshbuf_put_u32(resp, allocated_listen_port)) != 0)
(r = sshbuf_pu...en_port)) != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
799 fatal("%s: sshbuf_put_u32: %s", __func__, ssh_err(r));
never executed: fatal("%s: sshbuf_put_u32: %s", __func__, ssh_err(r));
0
800 } else if (strcmp(rtype, "cancel-tcpip-forward") == 0) {
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( rtype ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( "cancel-tcpip-forward" ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
__extension__ ... )))); }) == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
801 struct Forward fwd;-
802-
803 memset(&fwd, 0, sizeof(fwd));-
804 fwd.listen_host = packet_get_string(NULL);-
805 fwd.listen_port = (u_short)packet_get_int();-
806 debug("%s: cancel-tcpip-forward addr %s port %d", __func__,-
807 fwd.listen_host, fwd.listen_port);-
808-
809 success = channel_cancel_rport_listener(ssh, &fwd);-
810 free(fwd.listen_host);-
811 } else if (strcmp(rtype, "streamlocal-forward@openssh.com") == 0) {
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( rtype ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( "streamlocal-forward@openssh.com" ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
__extension__ ... )))); }) == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
812 struct Forward fwd;-
813-
814 memset(&fwd, 0, sizeof(fwd));-
815 fwd.listen_path = packet_get_string(NULL);-
816 debug("%s: streamlocal-forward listen path %s", __func__,-
817 fwd.listen_path);-
818-
819 /* check permissions */-
820 if ((options.allow_streamlocal_forwarding & FORWARD_REMOTE) == 0
(options.allow...ng & (1)) == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
821 || !auth_opts->permit_port_forwarding_flag ||
!auth_opts->pe...orwarding_flagDescription
TRUEnever evaluated
FALSEnever evaluated
0
822 options.disable_forwarding ||
options.disable_forwardingDescription
TRUEnever evaluated
FALSEnever evaluated
0
823 (pw->pw_uid != 0 && !use_privsep)) {
pw->pw_uid != 0Description
TRUEnever evaluated
FALSEnever evaluated
!use_privsepDescription
TRUEnever evaluated
FALSEnever evaluated
0
824 success = 0;-
825 packet_send_debug("Server has disabled "-
826 "streamlocal forwarding.");-
827 } else {
never executed: end of block
0
828 /* Start listening on the socket */-
829 success = channel_setup_remote_fwd_listener(ssh,-
830 &fwd, NULL, &options.fwd_opts);-
831 }
never executed: end of block
0
832 free(fwd.listen_path);-
833 } else if (strcmp(rtype, "cancel-streamlocal-forward@openssh.com") == 0) {
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( rtype ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( "cancel-streamlocal-forward@openssh.com" ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
__extension__ ... )))); }) == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
834 struct Forward fwd;-
835-
836 memset(&fwd, 0, sizeof(fwd));-
837 fwd.listen_path = packet_get_string(NULL);-
838 debug("%s: cancel-streamlocal-forward path %s", __func__,-
839 fwd.listen_path);-
840-
841 success = channel_cancel_rport_listener(ssh, &fwd);-
842 free(fwd.listen_path);-
843 } else if (strcmp(rtype, "no-more-sessions@openssh.com") == 0) {
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( rtype ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( "no-more-sessions@openssh.com" ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
__extension__ ... )))); }) == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
844 no_more_sessions = 1;-
845 success = 1;-
846 } else if (strcmp(rtype, "hostkeys-prove-00@openssh.com") == 0) {
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( rtype ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( "hostkeys-prove-00@openssh.com" ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
__extension__ ... )))); }) == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
847 success = server_input_hostkeys_prove(ssh, &resp);-
848 }
never executed: end of block
0
849 if (want_reply) {
want_replyDescription
TRUEnever evaluated
FALSEnever evaluated
0
850 packet_start(success ?-
851 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);-
852 if (success && resp != NULL)
successDescription
TRUEnever evaluated
FALSEnever evaluated
resp != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
853 ssh_packet_put_raw(ssh, sshbuf_ptr(resp),
never executed: ssh_packet_put_raw(ssh, sshbuf_ptr(resp), sshbuf_len(resp));
0
854 sshbuf_len(resp));
never executed: ssh_packet_put_raw(ssh, sshbuf_ptr(resp), sshbuf_len(resp));
0
855 packet_send();-
856 packet_write_wait();-
857 }
never executed: end of block
0
858 free(rtype);-
859 sshbuf_free(resp);-
860 return 0;
never executed: return 0;
0
861}-
862-
863static int-
864server_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)-
865{-
866 Channel *c;-
867 int id, reply, success = 0;-
868 char *rtype;-
869-
870 id = packet_get_int();-
871 rtype = packet_get_string(NULL);-
872 reply = packet_get_char();-
873-
874 debug("server_input_channel_req: channel %d request %s reply %d",-
875 id, rtype, reply);-
876-
877 if ((c = channel_lookup(ssh, id)) == NULL)
(c = channel_l...== ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
878 packet_disconnect("server_input_channel_req: "
never executed: packet_disconnect("server_input_channel_req: " "unknown channel %d", id);
0
879 "unknown channel %d", id);
never executed: packet_disconnect("server_input_channel_req: " "unknown channel %d", id);
0
880 if (!strcmp(rtype, "eow@openssh.com")) {
never executed: __result = (((const unsigned char *) (const char *) ( rtype ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( "eow@openssh.com" ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
! __extension_....com" )))); })Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
881 packet_check_eom();
never executed: end of block
_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
0
882 chan_rcvd_eow(ssh, c);-
883 } else if ((c->type == SSH_CHANNEL_LARVAL ||
never executed: end of block
c->type == 10Description
TRUEnever evaluated
FALSEnever evaluated
0
884 c->type == SSH_CHANNEL_OPEN) && strcmp(c->ctype, "session") == 0)
never executed: __result = (((const unsigned char *) (const char *) ( c->ctype ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
never executed: __result = (((const unsigned char *) (const char *) ( "session" ))[3] - __s2[3]);
never executed: end of block
never executed: end of block
c->type == 4Description
TRUEnever evaluated
FALSEnever evaluated
__extension__ ... )))); }) == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s1_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 1Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
__s2_len > 2Description
TRUEnever evaluated
FALSEnever evaluated
__result == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
885 success = session_input_channel_req(ssh, c, rtype);
never executed: success = session_input_channel_req(ssh, c, rtype);
0
886 if (reply && !(c->flags & CHAN_CLOSE_SENT)) {
replyDescription
TRUEnever evaluated
FALSEnever evaluated
!(c->flags & 0x01)Description
TRUEnever evaluated
FALSEnever evaluated
0
887 if (!c->have_remote_id)
!c->have_remote_idDescription
TRUEnever evaluated
FALSEnever evaluated
0
888 fatal("%s: channel %d: no remote_id",
never executed: fatal("%s: channel %d: no remote_id", __func__, c->self);
0
889 __func__, c->self);
never executed: fatal("%s: channel %d: no remote_id", __func__, c->self);
0
890 packet_start(success ?-
891 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);-
892 packet_put_int(c->remote_id);-
893 packet_send();-
894 }
never executed: end of block
0
895 free(rtype);-
896 return 0;
never executed: return 0;
0
897}-
898-
899static void-
900server_init_dispatch(void)-
901{-
902 debug("server_init_dispatch");-
903 dispatch_init(&dispatch_protocol_error);-
904 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);-
905 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);-
906 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);-
907 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);-
908 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open);-
909 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);-
910 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);-
911 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &server_input_channel_req);-
912 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);-
913 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request);-
914 /* client_alive */-
915 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &server_input_keep_alive);-
916 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_keep_alive);-
917 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &server_input_keep_alive);-
918 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &server_input_keep_alive);-
919 /* rekeying */-
920 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);-
921}
never executed: end of block
0
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