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7368a6c8 | 1 | /* |
2 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
3 | * All rights reserved | |
bcbf86ec | 4 | * |
5 | * As far as I am concerned, the code I have written for this software | |
6 | * can be used freely for any purpose. Any derived versions of this | |
7 | * software must be clearly marked as such, and if the derived work is | |
8 | * incompatible with the protocol description in the RFC file, it must be | |
9 | * called by a name other than "ssh" or "Secure Shell". | |
10 | * | |
e78a59f5 | 11 | * SSH2 support by Markus Friedl. |
12 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
bcbf86ec | 13 | * |
14 | * Redistribution and use in source and binary forms, with or without | |
15 | * modification, are permitted provided that the following conditions | |
16 | * are met: | |
17 | * 1. Redistributions of source code must retain the above copyright | |
18 | * notice, this list of conditions and the following disclaimer. | |
19 | * 2. Redistributions in binary form must reproduce the above copyright | |
20 | * notice, this list of conditions and the following disclaimer in the | |
21 | * documentation and/or other materials provided with the distribution. | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
26 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
29 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
30 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
e78a59f5 | 33 | */ |
7368a6c8 | 34 | |
35 | #include "includes.h" | |
d343d900 | 36 | RCSID("$OpenBSD: session.c,v 1.44 2000/11/14 23:44:19 markus Exp $"); |
7368a6c8 | 37 | |
38 | #include "xmalloc.h" | |
39 | #include "ssh.h" | |
40 | #include "pty.h" | |
41 | #include "packet.h" | |
42 | #include "buffer.h" | |
7368a6c8 | 43 | #include "mpaux.h" |
44 | #include "servconf.h" | |
45 | #include "uidswap.h" | |
46 | #include "compat.h" | |
47 | #include "channels.h" | |
48 | #include "nchan.h" | |
49 | ||
e78a59f5 | 50 | #include "bufaux.h" |
51 | #include "ssh2.h" | |
52 | #include "auth.h" | |
38c295d6 | 53 | #include "auth-options.h" |
e78a59f5 | 54 | |
3206bb3b | 55 | #ifdef WITH_IRIX_PROJECT |
56 | #include <proj.h> | |
57 | #endif /* WITH_IRIX_PROJECT */ | |
d287c664 | 58 | #ifdef WITH_IRIX_JOBS |
59 | #include <sys/resource.h> | |
260d427b | 60 | #endif |
61 | #ifdef WITH_IRIX_AUDIT | |
62 | #include <sat.h> | |
63 | #endif /* WITH_IRIX_AUDIT */ | |
3206bb3b | 64 | |
089fbbd2 | 65 | #if defined(HAVE_USERSEC_H) |
66 | #include <usersec.h> | |
67 | #endif | |
68 | ||
4d33e531 | 69 | #ifdef HAVE_OSF_SIA |
70 | # include <sia.h> | |
71 | # include <siad.h> | |
72 | #endif | |
73 | ||
3c62e7eb | 74 | #ifdef HAVE_CYGWIN |
75 | #include <windows.h> | |
76 | #include <sys/cygwin.h> | |
77 | #define is_winnt (GetVersion() < 0x80000000) | |
78 | #endif | |
79 | ||
3fcce26c | 80 | /* AIX limits */ |
81 | #if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE) | |
2a2cb9e7 | 82 | # define S_UFSIZE_HARD S_UFSIZE "_hard" |
83 | # define S_UCPU_HARD S_UCPU "_hard" | |
84 | # define S_UDATA_HARD S_UDATA "_hard" | |
85 | # define S_USTACK_HARD S_USTACK "_hard" | |
86 | # define S_URSS_HARD S_URSS "_hard" | |
87 | # define S_UCORE_HARD S_UCORE "_hard" | |
88 | # define S_UNOFILE_HARD S_UNOFILE "_hard" | |
3fcce26c | 89 | #endif |
90 | ||
2e73a022 | 91 | #ifdef HAVE_LOGIN_CAP |
92 | #include <login_cap.h> | |
93 | #endif | |
94 | ||
7368a6c8 | 95 | /* types */ |
96 | ||
97 | #define TTYSZ 64 | |
98 | typedef struct Session Session; | |
99 | struct Session { | |
100 | int used; | |
101 | int self; | |
0b242b12 | 102 | int extended; |
7368a6c8 | 103 | struct passwd *pw; |
104 | pid_t pid; | |
105 | /* tty */ | |
106 | char *term; | |
107 | int ptyfd, ttyfd, ptymaster; | |
108 | int row, col, xpixel, ypixel; | |
109 | char tty[TTYSZ]; | |
110 | /* X11 */ | |
111 | char *display; | |
112 | int screen; | |
113 | char *auth_proto; | |
114 | char *auth_data; | |
0b242b12 | 115 | int single_connection; |
7368a6c8 | 116 | /* proto 2 */ |
117 | int chanid; | |
118 | }; | |
119 | ||
120 | /* func */ | |
121 | ||
122 | Session *session_new(void); | |
123 | void session_set_fds(Session *s, int fdin, int fdout, int fderr); | |
124 | void session_pty_cleanup(Session *s); | |
1d1ffb87 | 125 | void session_proctitle(Session *s); |
7368a6c8 | 126 | void do_exec_pty(Session *s, const char *command, struct passwd * pw); |
127 | void do_exec_no_pty(Session *s, const char *command, struct passwd * pw); | |
a22aff1f | 128 | void do_login(Session *s, const char *command); |
7368a6c8 | 129 | |
130 | void | |
131 | do_child(const char *command, struct passwd * pw, const char *term, | |
132 | const char *display, const char *auth_proto, | |
133 | const char *auth_data, const char *ttyname); | |
134 | ||
135 | /* import */ | |
136 | extern ServerOptions options; | |
137 | extern char *__progname; | |
138 | extern int log_stderr; | |
139 | extern int debug_flag; | |
c345cf9d | 140 | extern unsigned int utmp_len; |
7368a6c8 | 141 | |
089fbbd2 | 142 | extern int startup_pipe; |
143 | ||
7368a6c8 | 144 | /* Local Xauthority file. */ |
145 | static char *xauthfile; | |
146 | ||
b5e300c2 | 147 | /* original command from peer. */ |
148 | char *original_command = NULL; | |
149 | ||
7368a6c8 | 150 | /* data */ |
151 | #define MAX_SESSIONS 10 | |
152 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 153 | |
c1ef8333 | 154 | #ifdef WITH_AIXAUTHENTICATE |
155 | /* AIX's lastlogin message, set in auth1.c */ | |
156 | char *aixloginmsg; | |
157 | #endif /* WITH_AIXAUTHENTICATE */ | |
7368a6c8 | 158 | |
2e73a022 | 159 | #ifdef HAVE_LOGIN_CAP |
160 | static login_cap_t *lc; | |
161 | #endif | |
162 | ||
7368a6c8 | 163 | /* |
164 | * Remove local Xauthority file. | |
165 | */ | |
166 | void | |
167 | xauthfile_cleanup_proc(void *ignore) | |
168 | { | |
169 | debug("xauthfile_cleanup_proc called"); | |
170 | ||
171 | if (xauthfile != NULL) { | |
172 | char *p; | |
173 | unlink(xauthfile); | |
174 | p = strrchr(xauthfile, '/'); | |
175 | if (p != NULL) { | |
176 | *p = '\0'; | |
177 | rmdir(xauthfile); | |
178 | } | |
179 | xfree(xauthfile); | |
180 | xauthfile = NULL; | |
181 | } | |
182 | } | |
183 | ||
184 | /* | |
185 | * Function to perform cleanup if we get aborted abnormally (e.g., due to a | |
186 | * dropped connection). | |
187 | */ | |
6ae2364d | 188 | void |
7368a6c8 | 189 | pty_cleanup_proc(void *session) |
190 | { | |
191 | Session *s=session; | |
192 | if (s == NULL) | |
193 | fatal("pty_cleanup_proc: no session"); | |
194 | debug("pty_cleanup_proc: %s", s->tty); | |
195 | ||
196 | if (s->pid != 0) { | |
197 | /* Record that the user has logged out. */ | |
198 | record_logout(s->pid, s->tty); | |
199 | } | |
200 | ||
201 | /* Release the pseudo-tty. */ | |
202 | pty_release(s->tty); | |
203 | } | |
204 | ||
205 | /* | |
206 | * Prepares for an interactive session. This is called after the user has | |
207 | * been successfully authenticated. During this message exchange, pseudo | |
208 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
209 | * are requested, etc. | |
210 | */ | |
6ae2364d | 211 | void |
7368a6c8 | 212 | do_authenticated(struct passwd * pw) |
213 | { | |
214 | Session *s; | |
b5e300c2 | 215 | int type, fd; |
7368a6c8 | 216 | int compression_level = 0, enable_compression_after_reply = 0; |
217 | int have_pty = 0; | |
218 | char *command; | |
219 | int n_bytes; | |
220 | int plen; | |
221 | unsigned int proto_len, data_len, dlen; | |
222 | ||
223 | /* | |
224 | * Cancel the alarm we set to limit the time taken for | |
225 | * authentication. | |
226 | */ | |
227 | alarm(0); | |
3f7a7e4a | 228 | if (startup_pipe != -1) { |
5540ea9b | 229 | close(startup_pipe); |
3f7a7e4a | 230 | startup_pipe = -1; |
231 | } | |
7368a6c8 | 232 | |
233 | /* | |
234 | * Inform the channel mechanism that we are the server side and that | |
235 | * the client may request to connect to any port at all. (The user | |
236 | * could do it anyway, and we wouldn\'t know what is permitted except | |
237 | * by the client telling us, so we can equally well trust the client | |
238 | * not to request anything bogus.) | |
239 | */ | |
33de75a3 | 240 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) |
7368a6c8 | 241 | channel_permit_all_opens(); |
242 | ||
243 | s = session_new(); | |
0b242b12 | 244 | s->pw = pw; |
7368a6c8 | 245 | |
97994d32 | 246 | #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD) |
2e73a022 | 247 | if ((lc = login_getclass(pw->pw_class)) == NULL) { |
248 | error("unable to get login class"); | |
249 | return; | |
250 | } | |
251 | #endif | |
252 | ||
7368a6c8 | 253 | /* |
254 | * We stay in this loop until the client requests to execute a shell | |
255 | * or a command. | |
256 | */ | |
257 | for (;;) { | |
258 | int success = 0; | |
259 | ||
260 | /* Get a packet from the client. */ | |
261 | type = packet_read(&plen); | |
262 | ||
263 | /* Process the packet. */ | |
264 | switch (type) { | |
265 | case SSH_CMSG_REQUEST_COMPRESSION: | |
266 | packet_integrity_check(plen, 4, type); | |
267 | compression_level = packet_get_int(); | |
268 | if (compression_level < 1 || compression_level > 9) { | |
269 | packet_send_debug("Received illegal compression level %d.", | |
270 | compression_level); | |
271 | break; | |
272 | } | |
273 | /* Enable compression after we have responded with SUCCESS. */ | |
274 | enable_compression_after_reply = 1; | |
275 | success = 1; | |
276 | break; | |
277 | ||
278 | case SSH_CMSG_REQUEST_PTY: | |
279 | if (no_pty_flag) { | |
280 | debug("Allocating a pty not permitted for this authentication."); | |
281 | break; | |
282 | } | |
283 | if (have_pty) | |
284 | packet_disconnect("Protocol error: you already have a pty."); | |
285 | ||
286 | debug("Allocating pty."); | |
287 | ||
288 | /* Allocate a pty and open it. */ | |
289 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, | |
290 | sizeof(s->tty))) { | |
291 | error("Failed to allocate pty."); | |
292 | break; | |
293 | } | |
294 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
295 | pty_setowner(pw, s->tty); | |
296 | ||
297 | /* Get TERM from the packet. Note that the value may be of arbitrary length. */ | |
298 | s->term = packet_get_string(&dlen); | |
299 | packet_integrity_check(dlen, strlen(s->term), type); | |
300 | /* packet_integrity_check(plen, 4 + dlen + 4*4 + n_bytes, type); */ | |
301 | /* Remaining bytes */ | |
302 | n_bytes = plen - (4 + dlen + 4 * 4); | |
303 | ||
304 | if (strcmp(s->term, "") == 0) { | |
305 | xfree(s->term); | |
306 | s->term = NULL; | |
307 | } | |
308 | /* Get window size from the packet. */ | |
309 | s->row = packet_get_int(); | |
310 | s->col = packet_get_int(); | |
311 | s->xpixel = packet_get_int(); | |
312 | s->ypixel = packet_get_int(); | |
313 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
314 | ||
315 | /* Get tty modes from the packet. */ | |
316 | tty_parse_modes(s->ttyfd, &n_bytes); | |
317 | packet_integrity_check(plen, 4 + dlen + 4 * 4 + n_bytes, type); | |
318 | ||
1d1ffb87 | 319 | session_proctitle(s); |
320 | ||
7368a6c8 | 321 | /* Indicate that we now have a pty. */ |
322 | success = 1; | |
323 | have_pty = 1; | |
324 | break; | |
325 | ||
326 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
327 | if (!options.x11_forwarding) { | |
328 | packet_send_debug("X11 forwarding disabled in server configuration file."); | |
329 | break; | |
330 | } | |
6fc1e9f3 | 331 | if (!options.xauth_location) { |
332 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
333 | break; | |
334 | } | |
7368a6c8 | 335 | if (no_x11_forwarding_flag) { |
336 | packet_send_debug("X11 forwarding not permitted for this authentication."); | |
337 | break; | |
338 | } | |
339 | debug("Received request for X11 forwarding with auth spoofing."); | |
340 | if (s->display != NULL) | |
341 | packet_disconnect("Protocol error: X11 display already set."); | |
342 | ||
343 | s->auth_proto = packet_get_string(&proto_len); | |
344 | s->auth_data = packet_get_string(&data_len); | |
345 | packet_integrity_check(plen, 4 + proto_len + 4 + data_len + 4, type); | |
346 | ||
347 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_SCREEN_NUMBER) | |
348 | s->screen = packet_get_int(); | |
349 | else | |
350 | s->screen = 0; | |
351 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
352 | ||
353 | if (s->display == NULL) | |
354 | break; | |
355 | ||
356 | /* Setup to always have a local .Xauthority. */ | |
357 | xauthfile = xmalloc(MAXPATHLEN); | |
358 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
359 | temporarily_use_uid(pw->pw_uid); | |
360 | if (mkdtemp(xauthfile) == NULL) { | |
361 | restore_uid(); | |
362 | error("private X11 dir: mkdtemp %s failed: %s", | |
363 | xauthfile, strerror(errno)); | |
364 | xfree(xauthfile); | |
365 | xauthfile = NULL; | |
0b242b12 | 366 | /* XXXX remove listening channels */ |
7368a6c8 | 367 | break; |
368 | } | |
369 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
b5e300c2 | 370 | fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); |
371 | if (fd >= 0) | |
372 | close(fd); | |
7368a6c8 | 373 | restore_uid(); |
374 | fatal_add_cleanup(xauthfile_cleanup_proc, NULL); | |
375 | success = 1; | |
376 | break; | |
7368a6c8 | 377 | |
378 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
379 | if (no_agent_forwarding_flag || compat13) { | |
380 | debug("Authentication agent forwarding not permitted for this authentication."); | |
381 | break; | |
382 | } | |
383 | debug("Received authentication agent forwarding request."); | |
6fc1e9f3 | 384 | success = auth_input_request_forwarding(pw); |
7368a6c8 | 385 | break; |
386 | ||
387 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
388 | if (no_port_forwarding_flag) { | |
389 | debug("Port forwarding not permitted for this authentication."); | |
390 | break; | |
391 | } | |
33de75a3 | 392 | if (!options.allow_tcp_forwarding) { |
393 | debug("Port forwarding not permitted."); | |
394 | break; | |
395 | } | |
7368a6c8 | 396 | debug("Received TCP/IP port forwarding request."); |
1d1ffb87 | 397 | channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 398 | success = 1; |
399 | break; | |
400 | ||
401 | case SSH_CMSG_MAX_PACKET_SIZE: | |
402 | if (packet_set_maxsize(packet_get_int()) > 0) | |
403 | success = 1; | |
404 | break; | |
405 | ||
406 | case SSH_CMSG_EXEC_SHELL: | |
407 | case SSH_CMSG_EXEC_CMD: | |
408 | /* Set interactive/non-interactive mode. */ | |
409 | packet_set_interactive(have_pty || s->display != NULL, | |
410 | options.keepalives); | |
411 | ||
412 | if (type == SSH_CMSG_EXEC_CMD) { | |
413 | command = packet_get_string(&dlen); | |
414 | debug("Exec command '%.500s'", command); | |
415 | packet_integrity_check(plen, 4 + dlen, type); | |
416 | } else { | |
417 | command = NULL; | |
418 | packet_integrity_check(plen, 0, type); | |
419 | } | |
420 | if (forced_command != NULL) { | |
b5e300c2 | 421 | original_command = command; |
7368a6c8 | 422 | command = forced_command; |
423 | debug("Forced command '%.500s'", forced_command); | |
424 | } | |
425 | if (have_pty) | |
426 | do_exec_pty(s, command, pw); | |
427 | else | |
428 | do_exec_no_pty(s, command, pw); | |
429 | ||
430 | if (command != NULL) | |
431 | xfree(command); | |
432 | /* Cleanup user's local Xauthority file. */ | |
433 | if (xauthfile) | |
434 | xauthfile_cleanup_proc(NULL); | |
435 | return; | |
436 | ||
437 | default: | |
438 | /* | |
439 | * Any unknown messages in this phase are ignored, | |
440 | * and a failure message is returned. | |
441 | */ | |
442 | log("Unknown packet type received after authentication: %d", type); | |
443 | } | |
444 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
445 | packet_send(); | |
446 | packet_write_wait(); | |
447 | ||
448 | /* Enable compression now that we have replied if appropriate. */ | |
449 | if (enable_compression_after_reply) { | |
450 | enable_compression_after_reply = 0; | |
451 | packet_start_compression(compression_level); | |
452 | } | |
453 | } | |
454 | } | |
455 | ||
456 | /* | |
457 | * This is called to fork and execute a command when we have no tty. This | |
458 | * will call do_child from the child, and server_loop from the parent after | |
459 | * setting up file descriptors and such. | |
460 | */ | |
6ae2364d | 461 | void |
7368a6c8 | 462 | do_exec_no_pty(Session *s, const char *command, struct passwd * pw) |
463 | { | |
464 | int pid; | |
465 | ||
466 | #ifdef USE_PIPES | |
467 | int pin[2], pout[2], perr[2]; | |
468 | /* Allocate pipes for communicating with the program. */ | |
469 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
470 | packet_disconnect("Could not create pipes: %.100s", | |
471 | strerror(errno)); | |
472 | #else /* USE_PIPES */ | |
473 | int inout[2], err[2]; | |
474 | /* Uses socket pairs to communicate with the program. */ | |
475 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
476 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
477 | packet_disconnect("Could not create socket pairs: %.100s", | |
478 | strerror(errno)); | |
479 | #endif /* USE_PIPES */ | |
480 | if (s == NULL) | |
481 | fatal("do_exec_no_pty: no session"); | |
482 | ||
857040fb | 483 | signal(SIGPIPE, SIG_DFL); |
484 | ||
1d1ffb87 | 485 | session_proctitle(s); |
7368a6c8 | 486 | |
487 | #ifdef USE_PAM | |
488 | do_pam_setcred(); | |
489 | #endif /* USE_PAM */ | |
490 | ||
491 | /* Fork the child. */ | |
492 | if ((pid = fork()) == 0) { | |
493 | /* Child. Reinitialize the log since the pid has changed. */ | |
494 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
495 | ||
496 | /* | |
497 | * Create a new session and process group since the 4.4BSD | |
498 | * setlogin() affects the entire process group. | |
499 | */ | |
500 | if (setsid() < 0) | |
501 | error("setsid failed: %.100s", strerror(errno)); | |
502 | ||
503 | #ifdef USE_PIPES | |
504 | /* | |
505 | * Redirect stdin. We close the parent side of the socket | |
506 | * pair, and make the child side the standard input. | |
507 | */ | |
508 | close(pin[1]); | |
509 | if (dup2(pin[0], 0) < 0) | |
510 | perror("dup2 stdin"); | |
511 | close(pin[0]); | |
512 | ||
513 | /* Redirect stdout. */ | |
514 | close(pout[0]); | |
515 | if (dup2(pout[1], 1) < 0) | |
516 | perror("dup2 stdout"); | |
517 | close(pout[1]); | |
518 | ||
519 | /* Redirect stderr. */ | |
520 | close(perr[0]); | |
521 | if (dup2(perr[1], 2) < 0) | |
522 | perror("dup2 stderr"); | |
523 | close(perr[1]); | |
524 | #else /* USE_PIPES */ | |
525 | /* | |
526 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
527 | * use the same socket, as some programs (particularly rdist) | |
528 | * seem to depend on it. | |
529 | */ | |
530 | close(inout[1]); | |
531 | close(err[1]); | |
532 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
533 | perror("dup2 stdin"); | |
534 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
535 | perror("dup2 stdout"); | |
536 | if (dup2(err[0], 2) < 0) /* stderr */ | |
537 | perror("dup2 stderr"); | |
538 | #endif /* USE_PIPES */ | |
539 | ||
540 | /* Do processing for the child (exec command etc). */ | |
541 | do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL); | |
542 | /* NOTREACHED */ | |
543 | } | |
3c62e7eb | 544 | #ifdef HAVE_CYGWIN |
545 | if (is_winnt) | |
546 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
547 | #endif | |
7368a6c8 | 548 | if (pid < 0) |
549 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
550 | s->pid = pid; | |
551 | #ifdef USE_PIPES | |
552 | /* We are the parent. Close the child sides of the pipes. */ | |
553 | close(pin[0]); | |
554 | close(pout[1]); | |
555 | close(perr[1]); | |
556 | ||
e78a59f5 | 557 | if (compat20) { |
0b242b12 | 558 | session_set_fds(s, pin[1], pout[0], s->extended ? perr[0] : -1); |
e78a59f5 | 559 | } else { |
560 | /* Enter the interactive session. */ | |
561 | server_loop(pid, pin[1], pout[0], perr[0]); | |
562 | /* server_loop has closed pin[1], pout[1], and perr[1]. */ | |
563 | } | |
7368a6c8 | 564 | #else /* USE_PIPES */ |
565 | /* We are the parent. Close the child sides of the socket pairs. */ | |
566 | close(inout[0]); | |
567 | close(err[0]); | |
568 | ||
569 | /* | |
570 | * Enter the interactive session. Note: server_loop must be able to | |
571 | * handle the case that fdin and fdout are the same. | |
572 | */ | |
e78a59f5 | 573 | if (compat20) { |
0b242b12 | 574 | session_set_fds(s, inout[1], inout[1], s->extended ? err[1] : -1); |
e78a59f5 | 575 | } else { |
576 | server_loop(pid, inout[1], inout[1], err[1]); | |
577 | /* server_loop has closed inout[1] and err[1]. */ | |
578 | } | |
7368a6c8 | 579 | #endif /* USE_PIPES */ |
580 | } | |
581 | ||
582 | /* | |
583 | * This is called to fork and execute a command when we have a tty. This | |
584 | * will call do_child from the child, and server_loop from the parent after | |
585 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
586 | * lastlog, and other such operations. | |
587 | */ | |
6ae2364d | 588 | void |
7368a6c8 | 589 | do_exec_pty(Session *s, const char *command, struct passwd * pw) |
590 | { | |
7368a6c8 | 591 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 592 | pid_t pid; |
7368a6c8 | 593 | |
594 | if (s == NULL) | |
595 | fatal("do_exec_pty: no session"); | |
596 | ptyfd = s->ptyfd; | |
597 | ttyfd = s->ttyfd; | |
598 | ||
7368a6c8 | 599 | #ifdef USE_PAM |
600 | do_pam_session(pw->pw_name, s->tty); | |
601 | do_pam_setcred(); | |
602 | #endif /* USE_PAM */ | |
603 | ||
604 | /* Fork the child. */ | |
605 | if ((pid = fork()) == 0) { | |
c345cf9d | 606 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 607 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
608 | ||
609 | /* Close the master side of the pseudo tty. */ | |
610 | close(ptyfd); | |
611 | ||
612 | /* Make the pseudo tty our controlling tty. */ | |
613 | pty_make_controlling_tty(&ttyfd, s->tty); | |
614 | ||
615 | /* Redirect stdin from the pseudo tty. */ | |
616 | if (dup2(ttyfd, fileno(stdin)) < 0) | |
617 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
618 | ||
619 | /* Redirect stdout to the pseudo tty. */ | |
620 | if (dup2(ttyfd, fileno(stdout)) < 0) | |
621 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
622 | ||
623 | /* Redirect stderr to the pseudo tty. */ | |
624 | if (dup2(ttyfd, fileno(stderr)) < 0) | |
625 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
626 | ||
627 | /* Close the extra descriptor for the pseudo tty. */ | |
628 | close(ttyfd); | |
629 | ||
c345cf9d | 630 | /* record login, etc. similar to login(1) */ |
a22aff1f | 631 | if (!(options.use_login && command == NULL)) |
632 | do_login(s, command); | |
7368a6c8 | 633 | |
7368a6c8 | 634 | /* Do common processing for the child, such as execing the command. */ |
71276795 | 635 | do_child(command, pw, s->term, s->display, s->auth_proto, |
636 | s->auth_data, s->tty); | |
7368a6c8 | 637 | /* NOTREACHED */ |
638 | } | |
3c62e7eb | 639 | #ifdef HAVE_CYGWIN |
640 | if (is_winnt) | |
641 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
642 | #endif | |
7368a6c8 | 643 | if (pid < 0) |
644 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
645 | s->pid = pid; | |
646 | ||
647 | /* Parent. Close the slave side of the pseudo tty. */ | |
648 | close(ttyfd); | |
649 | ||
650 | /* | |
651 | * Create another descriptor of the pty master side for use as the | |
652 | * standard input. We could use the original descriptor, but this | |
653 | * simplifies code in server_loop. The descriptor is bidirectional. | |
654 | */ | |
655 | fdout = dup(ptyfd); | |
656 | if (fdout < 0) | |
657 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
658 | ||
659 | /* we keep a reference to the pty master */ | |
660 | ptymaster = dup(ptyfd); | |
661 | if (ptymaster < 0) | |
662 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
663 | s->ptymaster = ptymaster; | |
664 | ||
665 | /* Enter interactive session. */ | |
e78a59f5 | 666 | if (compat20) { |
667 | session_set_fds(s, ptyfd, fdout, -1); | |
668 | } else { | |
669 | server_loop(pid, ptyfd, fdout, -1); | |
670 | /* server_loop _has_ closed ptyfd and fdout. */ | |
671 | session_pty_cleanup(s); | |
672 | } | |
7368a6c8 | 673 | } |
674 | ||
c345cf9d | 675 | const char * |
676 | get_remote_name_or_ip(void) | |
677 | { | |
678 | static const char *remote = ""; | |
679 | if (utmp_len > 0) | |
680 | remote = get_canonical_hostname(); | |
681 | if (utmp_len == 0 || strlen(remote) > utmp_len) | |
682 | remote = get_remote_ipaddr(); | |
683 | return remote; | |
684 | } | |
685 | ||
686 | /* administrative, login(1)-like work */ | |
687 | void | |
a22aff1f | 688 | do_login(Session *s, const char *command) |
c345cf9d | 689 | { |
690 | FILE *f; | |
691 | char *time_string; | |
692 | char buf[256]; | |
b5e300c2 | 693 | char hostname[MAXHOSTNAMELEN]; |
c345cf9d | 694 | socklen_t fromlen; |
695 | struct sockaddr_storage from; | |
696 | struct stat st; | |
697 | time_t last_login_time; | |
698 | struct passwd * pw = s->pw; | |
699 | pid_t pid = getpid(); | |
700 | ||
701 | /* | |
702 | * Get IP address of client. If the connection is not a socket, let | |
703 | * the address be 0.0.0.0. | |
704 | */ | |
705 | memset(&from, 0, sizeof(from)); | |
706 | if (packet_connection_is_on_socket()) { | |
707 | fromlen = sizeof(from); | |
708 | if (getpeername(packet_get_connection_in(), | |
709 | (struct sockaddr *) & from, &fromlen) < 0) { | |
710 | debug("getpeername: %.100s", strerror(errno)); | |
711 | fatal_cleanup(); | |
712 | } | |
713 | } | |
714 | ||
bcbf86ec | 715 | /* Get the time and hostname when the user last logged in. */ |
716 | hostname[0] = '\0'; | |
717 | last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name, | |
718 | hostname, sizeof(hostname)); | |
719 | ||
c345cf9d | 720 | /* Record that there was a login on that tty from the remote host. */ |
721 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
722 | get_remote_name_or_ip(), (struct sockaddr *)&from); | |
723 | ||
2919e060 | 724 | #ifdef USE_PAM |
725 | /* | |
726 | * If password change is needed, do it now. | |
727 | * This needs to occur before the ~/.hushlogin check. | |
728 | */ | |
729 | if (pam_password_change_required()) { | |
730 | print_pam_messages(); | |
731 | do_pam_chauthtok(); | |
732 | } | |
733 | #endif | |
734 | ||
a22aff1f | 735 | /* Done if .hushlogin exists or a command given. */ |
736 | if (command != NULL) | |
737 | return; | |
c345cf9d | 738 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); |
2e73a022 | 739 | #ifdef HAVE_LOGIN_CAP |
740 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
741 | #else | |
c345cf9d | 742 | if (stat(buf, &st) >= 0) |
2e73a022 | 743 | #endif |
c345cf9d | 744 | return; |
745 | ||
746 | #ifdef USE_PAM | |
2919e060 | 747 | if (!pam_password_change_required()) |
748 | print_pam_messages(); | |
c345cf9d | 749 | #endif /* USE_PAM */ |
750 | #ifdef WITH_AIXAUTHENTICATE | |
751 | if (aixloginmsg && *aixloginmsg) | |
752 | printf("%s\n", aixloginmsg); | |
753 | #endif /* WITH_AIXAUTHENTICATE */ | |
754 | ||
c345cf9d | 755 | if (last_login_time != 0) { |
756 | time_string = ctime(&last_login_time); | |
757 | if (strchr(time_string, '\n')) | |
758 | *strchr(time_string, '\n') = 0; | |
f478712e | 759 | if (strcmp(hostname, "") == 0) |
c345cf9d | 760 | printf("Last login: %s\r\n", time_string); |
761 | else | |
bcbf86ec | 762 | printf("Last login: %s from %s\r\n", time_string, hostname); |
c345cf9d | 763 | } |
764 | if (options.print_motd) { | |
2e73a022 | 765 | #ifdef HAVE_LOGIN_CAP |
766 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
767 | "/etc/motd"), "r"); | |
768 | #else | |
c345cf9d | 769 | f = fopen("/etc/motd", "r"); |
2e73a022 | 770 | #endif |
c345cf9d | 771 | if (f) { |
772 | while (fgets(buf, sizeof(buf), f)) | |
773 | fputs(buf, stdout); | |
774 | fclose(f); | |
775 | } | |
776 | } | |
777 | } | |
778 | ||
7368a6c8 | 779 | /* |
780 | * Sets the value of the given variable in the environment. If the variable | |
781 | * already exists, its value is overriden. | |
782 | */ | |
6ae2364d | 783 | void |
7368a6c8 | 784 | child_set_env(char ***envp, unsigned int *envsizep, const char *name, |
785 | const char *value) | |
786 | { | |
787 | unsigned int i, namelen; | |
788 | char **env; | |
789 | ||
790 | /* | |
791 | * Find the slot where the value should be stored. If the variable | |
792 | * already exists, we reuse the slot; otherwise we append a new slot | |
793 | * at the end of the array, expanding if necessary. | |
794 | */ | |
795 | env = *envp; | |
796 | namelen = strlen(name); | |
797 | for (i = 0; env[i]; i++) | |
798 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
799 | break; | |
800 | if (env[i]) { | |
801 | /* Reuse the slot. */ | |
802 | xfree(env[i]); | |
803 | } else { | |
804 | /* New variable. Expand if necessary. */ | |
805 | if (i >= (*envsizep) - 1) { | |
806 | (*envsizep) += 50; | |
807 | env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); | |
808 | } | |
809 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
810 | env[i + 1] = NULL; | |
811 | } | |
812 | ||
813 | /* Allocate space and format the variable in the appropriate slot. */ | |
814 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
815 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
816 | } | |
817 | ||
818 | /* | |
819 | * Reads environment variables from the given file and adds/overrides them | |
820 | * into the environment. If the file does not exist, this does nothing. | |
821 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
822 | * and assignments of the form name=value. No other forms are allowed. | |
823 | */ | |
6ae2364d | 824 | void |
7368a6c8 | 825 | read_environment_file(char ***env, unsigned int *envsize, |
826 | const char *filename) | |
827 | { | |
828 | FILE *f; | |
829 | char buf[4096]; | |
830 | char *cp, *value; | |
831 | ||
832 | f = fopen(filename, "r"); | |
833 | if (!f) | |
834 | return; | |
835 | ||
836 | while (fgets(buf, sizeof(buf), f)) { | |
837 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) | |
838 | ; | |
839 | if (!*cp || *cp == '#' || *cp == '\n') | |
840 | continue; | |
841 | if (strchr(cp, '\n')) | |
842 | *strchr(cp, '\n') = '\0'; | |
843 | value = strchr(cp, '='); | |
844 | if (value == NULL) { | |
845 | fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf); | |
846 | continue; | |
847 | } | |
71276795 | 848 | /* |
849 | * Replace the equals sign by nul, and advance value to | |
850 | * the value string. | |
851 | */ | |
7368a6c8 | 852 | *value = '\0'; |
853 | value++; | |
854 | child_set_env(env, envsize, cp, value); | |
855 | } | |
856 | fclose(f); | |
857 | } | |
858 | ||
859 | #ifdef USE_PAM | |
860 | /* | |
861 | * Sets any environment variables which have been specified by PAM | |
862 | */ | |
863 | void do_pam_environment(char ***env, int *envsize) | |
864 | { | |
865 | char *equals, var_name[512], var_val[512]; | |
866 | char **pam_env; | |
867 | int i; | |
868 | ||
869 | if ((pam_env = fetch_pam_environment()) == NULL) | |
870 | return; | |
871 | ||
872 | for(i = 0; pam_env[i] != NULL; i++) { | |
873 | if ((equals = strstr(pam_env[i], "=")) == NULL) | |
874 | continue; | |
875 | ||
876 | if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) { | |
877 | memset(var_name, '\0', sizeof(var_name)); | |
878 | memset(var_val, '\0', sizeof(var_val)); | |
879 | ||
880 | strncpy(var_name, pam_env[i], equals - pam_env[i]); | |
881 | strcpy(var_val, equals + 1); | |
882 | ||
22d89d24 | 883 | debug3("PAM environment: %s=%s", var_name, var_val); |
7368a6c8 | 884 | |
885 | child_set_env(env, envsize, var_name, var_val); | |
886 | } | |
887 | } | |
888 | } | |
889 | #endif /* USE_PAM */ | |
890 | ||
22d89d24 | 891 | |
892 | #ifdef HAVE_CYGWIN | |
893 | void copy_environment(char ***env, int *envsize) | |
894 | { | |
895 | char *equals, var_name[512], var_val[512]; | |
896 | int i; | |
897 | ||
898 | for(i = 0; environ[i] != NULL; i++) { | |
899 | if ((equals = strstr(environ[i], "=")) == NULL) | |
900 | continue; | |
901 | ||
902 | if (strlen(environ[i]) < (sizeof(var_name) - 1)) { | |
903 | memset(var_name, '\0', sizeof(var_name)); | |
904 | memset(var_val, '\0', sizeof(var_val)); | |
905 | ||
906 | strncpy(var_name, environ[i], equals - environ[i]); | |
907 | strcpy(var_val, equals + 1); | |
908 | ||
909 | debug3("Copy environment: %s=%s", var_name, var_val); | |
910 | ||
911 | child_set_env(env, envsize, var_name, var_val); | |
912 | } | |
913 | } | |
914 | } | |
915 | #endif | |
916 | ||
5fa45897 | 917 | #if defined(HAVE_GETUSERATTR) |
918 | /* | |
919 | * AIX-specific login initialisation | |
920 | */ | |
921 | void set_limit(char *user, char *soft, char *hard, int resource, int mult) | |
922 | { | |
923 | struct rlimit rlim; | |
56118702 | 924 | int slim, hlim; |
5fa45897 | 925 | |
926 | getrlimit(resource, &rlim); | |
927 | ||
56118702 | 928 | slim = 0; |
929 | if (getuserattr(user, soft, &slim, SEC_INT) != -1) { | |
930 | if (slim < 0) { | |
931 | rlim.rlim_cur = RLIM_INFINITY; | |
932 | } else if (slim != 0) { | |
933 | /* See the wackiness below */ | |
934 | if (rlim.rlim_cur == slim * mult) | |
935 | slim = 0; | |
936 | else | |
937 | rlim.rlim_cur = slim * mult; | |
938 | } | |
939 | } | |
5fa45897 | 940 | |
56118702 | 941 | hlim = 0; |
942 | if (getuserattr(user, hard, &hlim, SEC_INT) != -1) { | |
943 | if (hlim < 0) { | |
944 | rlim.rlim_max = RLIM_INFINITY; | |
945 | } else if (hlim != 0) { | |
946 | rlim.rlim_max = hlim * mult; | |
947 | } | |
948 | } | |
5fa45897 | 949 | |
56118702 | 950 | /* |
951 | * XXX For cpu and fsize the soft limit is set to the hard limit | |
952 | * if the hard limit is left at its default value and the soft limit | |
953 | * is changed from its default value, either by requesting it | |
954 | * (slim == 0) or by setting it to the current default. At least | |
955 | * that's how rlogind does it. If you're confused you're not alone. | |
956 | * Bug or feature? AIX 4.3.1.2 | |
957 | */ | |
958 | if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu")) | |
959 | && hlim == 0 && slim != 0) | |
960 | rlim.rlim_max = rlim.rlim_cur; | |
961 | /* A specified hard limit limits the soft limit */ | |
962 | else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max) | |
963 | rlim.rlim_cur = rlim.rlim_max; | |
964 | /* A soft limit can increase a hard limit */ | |
965 | else if (rlim.rlim_cur > rlim.rlim_max) | |
5fa45897 | 966 | rlim.rlim_max = rlim.rlim_cur; |
967 | ||
968 | if (setrlimit(resource, &rlim) != 0) | |
56118702 | 969 | error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno)); |
5fa45897 | 970 | } |
971 | ||
972 | void set_limits_from_userattr(char *user) | |
973 | { | |
974 | int mask; | |
975 | char buf[16]; | |
976 | ||
977 | set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512); | |
978 | set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1); | |
979 | set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512); | |
980 | set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512); | |
981 | set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512); | |
982 | set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512); | |
983 | #if defined(S_UNOFILE) | |
984 | set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1); | |
985 | #endif | |
986 | ||
987 | if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) { | |
988 | /* Convert decimal to octal */ | |
989 | (void) snprintf(buf, sizeof(buf), "%d", mask); | |
990 | if (sscanf(buf, "%o", &mask) == 1) | |
991 | umask(mask); | |
992 | } | |
993 | } | |
994 | #endif /* defined(HAVE_GETUSERATTR) */ | |
995 | ||
7368a6c8 | 996 | /* |
997 | * Performs common processing for the child, such as setting up the | |
998 | * environment, closing extra file descriptors, setting the user and group | |
999 | * ids, and executing the command or shell. | |
1000 | */ | |
6ae2364d | 1001 | void |
7368a6c8 | 1002 | do_child(const char *command, struct passwd * pw, const char *term, |
1003 | const char *display, const char *auth_proto, | |
1004 | const char *auth_data, const char *ttyname) | |
1005 | { | |
b5e300c2 | 1006 | const char *shell, *hostname = NULL, *cp = NULL; |
7368a6c8 | 1007 | char buf[256]; |
6fc1e9f3 | 1008 | char cmd[1024]; |
2e73a022 | 1009 | FILE *f = NULL; |
7368a6c8 | 1010 | unsigned int envsize, i; |
1011 | char **env; | |
1012 | extern char **environ; | |
1013 | struct stat st; | |
1014 | char *argv[10]; | |
3206bb3b | 1015 | #ifdef WITH_IRIX_PROJECT |
1016 | prid_t projid; | |
1017 | #endif /* WITH_IRIX_PROJECT */ | |
d287c664 | 1018 | #ifdef WITH_IRIX_JOBS |
1019 | jid_t jid = 0; | |
1020 | #else | |
1021 | #ifdef WITH_IRIX_ARRAY | |
1022 | int jid = 0; | |
1023 | #endif /* WITH_IRIX_ARRAY */ | |
1024 | #endif /* WITH_IRIX_JOBS */ | |
1025 | ||
7368a6c8 | 1026 | |
fa649821 | 1027 | /* login(1) is only called if we execute the login shell */ |
1028 | if (options.use_login && command != NULL) | |
1029 | options.use_login = 0; | |
1030 | ||
7368a6c8 | 1031 | #ifndef USE_PAM /* pam_nologin handles this */ |
2e73a022 | 1032 | if (!options.use_login) { |
1033 | # ifdef HAVE_LOGIN_CAP | |
1034 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1035 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1036 | _PATH_NOLOGIN), "r"); | |
1037 | # else /* HAVE_LOGIN_CAP */ | |
1038 | if (pw->pw_uid) | |
1039 | f = fopen(_PATH_NOLOGIN, "r"); | |
1040 | # endif /* HAVE_LOGIN_CAP */ | |
1041 | if (f) { | |
1042 | /* /etc/nologin exists. Print its contents and exit. */ | |
1043 | while (fgets(buf, sizeof(buf), f)) | |
1044 | fputs(buf, stderr); | |
1045 | fclose(f); | |
7368a6c8 | 1046 | exit(254); |
2e73a022 | 1047 | } |
7368a6c8 | 1048 | } |
1049 | #endif /* USE_PAM */ | |
1050 | ||
2e73a022 | 1051 | /* Set login name, uid, gid, and groups. */ |
7368a6c8 | 1052 | /* Login(1) does this as well, and it needs uid 0 for the "-h" |
1053 | switch, so we let login(1) to this for us. */ | |
1054 | if (!options.use_login) { | |
4d33e531 | 1055 | #ifdef HAVE_OSF_SIA |
1056 | extern char **saved_argv; | |
1057 | extern int saved_argc; | |
1058 | char *host = get_canonical_hostname (); | |
1059 | ||
1060 | if (sia_become_user(NULL, saved_argc, saved_argv, host, | |
1061 | pw->pw_name, ttyname, 0, NULL, NULL, SIA_BEU_SETLUID) != | |
1062 | SIASUCCESS) { | |
1063 | perror("sia_become_user"); | |
1064 | exit(1); | |
1065 | } | |
1066 | if (setreuid(geteuid(), geteuid()) < 0) { | |
1067 | perror("setreuid"); | |
1068 | exit(1); | |
1069 | } | |
1070 | #else /* HAVE_OSF_SIA */ | |
3c62e7eb | 1071 | #ifdef HAVE_CYGWIN |
1072 | if (is_winnt) { | |
1073 | #else | |
7368a6c8 | 1074 | if (getuid() == 0 || geteuid() == 0) { |
3c62e7eb | 1075 | #endif |
2e73a022 | 1076 | # ifdef HAVE_GETUSERATTR |
5fa45897 | 1077 | set_limits_from_userattr(pw->pw_name); |
2e73a022 | 1078 | # endif /* HAVE_GETUSERATTR */ |
1079 | # ifdef HAVE_LOGIN_CAP | |
1080 | if (setusercontext(lc, pw, pw->pw_uid, | |
1081 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1082 | perror("unable to set user context"); | |
1083 | exit(1); | |
1084 | } | |
1085 | # else /* HAVE_LOGIN_CAP */ | |
1086 | if (setlogin(pw->pw_name) < 0) | |
1087 | error("setlogin failed: %s", strerror(errno)); | |
7368a6c8 | 1088 | if (setgid(pw->pw_gid) < 0) { |
1089 | perror("setgid"); | |
1090 | exit(1); | |
1091 | } | |
1092 | /* Initialize the group list. */ | |
1093 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1094 | perror("initgroups"); | |
1095 | exit(1); | |
1096 | } | |
1097 | endgrent(); | |
d287c664 | 1098 | # ifdef WITH_IRIX_JOBS |
1099 | jid = jlimit_startjob(pw->pw_name, pw->pw_uid, "interactive"); | |
1100 | if (jid == -1) { | |
1101 | fatal("Failed to create job container: %.100s", | |
1102 | strerror(errno)); | |
1103 | } | |
1104 | # endif /* WITH_IRIX_JOBS */ | |
2e73a022 | 1105 | # ifdef WITH_IRIX_ARRAY |
3206bb3b | 1106 | /* initialize array session */ |
d287c664 | 1107 | if (jid == 0) { |
1108 | if (newarraysess() != 0) | |
1109 | fatal("Failed to set up new array session: %.100s", | |
1110 | strerror(errno)); | |
1111 | } | |
2e73a022 | 1112 | # endif /* WITH_IRIX_ARRAY */ |
1113 | # ifdef WITH_IRIX_PROJECT | |
3206bb3b | 1114 | /* initialize irix project info */ |
1115 | if ((projid = getdfltprojuser(pw->pw_name)) == -1) { | |
1116 | debug("Failed to get project id, using projid 0"); | |
1117 | projid = 0; | |
1118 | } | |
3206bb3b | 1119 | if (setprid(projid)) |
1120 | fatal("Failed to initialize project %d for %s: %.100s", | |
1121 | (int)projid, pw->pw_name, strerror(errno)); | |
2e73a022 | 1122 | # endif /* WITH_IRIX_PROJECT */ |
260d427b | 1123 | #ifdef WITH_IRIX_AUDIT |
1124 | if (sysconf(_SC_AUDIT)) { | |
1125 | debug("Setting sat id to %d", (int) pw->pw_uid); | |
1126 | if (satsetid(pw->pw_uid)) | |
1127 | debug("error setting satid: %.100s", strerror(errno)); | |
1128 | } | |
1129 | #endif /* WITH_IRIX_AUDIT */ | |
1130 | ||
7368a6c8 | 1131 | /* Permanently switch to the desired uid. */ |
1132 | permanently_set_uid(pw->pw_uid); | |
2e73a022 | 1133 | # endif /* HAVE_LOGIN_CAP */ |
7368a6c8 | 1134 | } |
2e73a022 | 1135 | #endif /* HAVE_OSF_SIA */ |
1136 | ||
3c62e7eb | 1137 | #ifdef HAVE_CYGWIN |
1138 | if (is_winnt) | |
1139 | #endif | |
7368a6c8 | 1140 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
14a9a859 | 1141 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); |
7368a6c8 | 1142 | } |
1143 | /* | |
1144 | * Get the shell from the password data. An empty shell field is | |
1145 | * legal, and means /bin/sh. | |
1146 | */ | |
1147 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
2e73a022 | 1148 | #ifdef HAVE_LOGIN_CAP |
1149 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1150 | #endif | |
7368a6c8 | 1151 | |
1152 | #ifdef AFS | |
1153 | /* Try to get AFS tokens for the local cell. */ | |
1154 | if (k_hasafs()) { | |
1155 | char cell[64]; | |
1156 | ||
1157 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1158 | krb_afslog(cell, 0); | |
1159 | ||
1160 | krb_afslog(0, 0); | |
1161 | } | |
1162 | #endif /* AFS */ | |
1163 | ||
1164 | /* Initialize the environment. */ | |
1165 | envsize = 100; | |
1166 | env = xmalloc(envsize * sizeof(char *)); | |
1167 | env[0] = NULL; | |
1168 | ||
3c62e7eb | 1169 | #ifdef HAVE_CYGWIN |
1170 | /* | |
1171 | * The Windows environment contains some setting which are | |
1172 | * important for a running system. They must not be dropped. | |
1173 | */ | |
22d89d24 | 1174 | copy_environment(&env, &envsize); |
3c62e7eb | 1175 | #endif |
1176 | ||
7368a6c8 | 1177 | if (!options.use_login) { |
1178 | /* Set basic environment. */ | |
1179 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
1180 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
1181 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); | |
2e73a022 | 1182 | #ifdef HAVE_LOGIN_CAP |
1183 | (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH); | |
1184 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1185 | #else /* HAVE_LOGIN_CAP */ |
1186 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1187 | /* |
1188 | * There's no standard path on Windows. The path contains | |
1189 | * important components pointing to the system directories, | |
1190 | * needed for loading shared libraries. So the path better | |
1191 | * remains intact here. | |
1192 | */ | |
7368a6c8 | 1193 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
22d89d24 | 1194 | # endif /* HAVE_CYGWIN */ |
1195 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1196 | |
1197 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1198 | _PATH_MAILDIR, pw->pw_name); | |
1199 | child_set_env(&env, &envsize, "MAIL", buf); | |
1200 | ||
1201 | /* Normal systems set SHELL by default. */ | |
1202 | child_set_env(&env, &envsize, "SHELL", shell); | |
1203 | } | |
1204 | if (getenv("TZ")) | |
1205 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1206 | ||
1207 | /* Set custom environment options from RSA authentication. */ | |
1208 | while (custom_environment) { | |
1209 | struct envstring *ce = custom_environment; | |
1210 | char *s = ce->s; | |
1211 | int i; | |
1212 | for (i = 0; s[i] != '=' && s[i]; i++); | |
1213 | if (s[i] == '=') { | |
1214 | s[i] = 0; | |
1215 | child_set_env(&env, &envsize, s, s + i + 1); | |
1216 | } | |
1217 | custom_environment = ce->next; | |
1218 | xfree(ce->s); | |
1219 | xfree(ce); | |
1220 | } | |
1221 | ||
1222 | snprintf(buf, sizeof buf, "%.50s %d %d", | |
1223 | get_remote_ipaddr(), get_remote_port(), get_local_port()); | |
1224 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); | |
1225 | ||
1226 | if (ttyname) | |
1227 | child_set_env(&env, &envsize, "SSH_TTY", ttyname); | |
1228 | if (term) | |
1229 | child_set_env(&env, &envsize, "TERM", term); | |
1230 | if (display) | |
1231 | child_set_env(&env, &envsize, "DISPLAY", display); | |
b5e300c2 | 1232 | if (original_command) |
1233 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1234 | original_command); | |
7368a6c8 | 1235 | |
1236 | #ifdef _AIX | |
22d89d24 | 1237 | if ((cp = getenv("AUTHSTATE")) != NULL) |
1238 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1239 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1240 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1241 | read_environment_file(&env, &envsize, "/etc/environment"); | |
7368a6c8 | 1242 | #endif |
1243 | ||
1244 | #ifdef KRB4 | |
1245 | { | |
1246 | extern char *ticket; | |
1247 | ||
1248 | if (ticket) | |
1249 | child_set_env(&env, &envsize, "KRBTKFILE", ticket); | |
1250 | } | |
1251 | #endif /* KRB4 */ | |
1252 | ||
1253 | #ifdef USE_PAM | |
1254 | /* Pull in any environment variables that may have been set by PAM. */ | |
1255 | do_pam_environment(&env, &envsize); | |
1256 | #endif /* USE_PAM */ | |
1257 | ||
7368a6c8 | 1258 | if (xauthfile) |
1259 | child_set_env(&env, &envsize, "XAUTHORITY", xauthfile); | |
1260 | if (auth_get_socket_name() != NULL) | |
1261 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, | |
1262 | auth_get_socket_name()); | |
1263 | ||
1264 | /* read $HOME/.ssh/environment. */ | |
1265 | if (!options.use_login) { | |
71276795 | 1266 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
1267 | pw->pw_dir); | |
7368a6c8 | 1268 | read_environment_file(&env, &envsize, buf); |
1269 | } | |
1270 | if (debug_flag) { | |
1271 | /* dump the environment */ | |
1272 | fprintf(stderr, "Environment:\n"); | |
1273 | for (i = 0; env[i]; i++) | |
1274 | fprintf(stderr, " %.200s\n", env[i]); | |
1275 | } | |
2e73a022 | 1276 | /* we have to stash the hostname before we close our socket. */ |
1277 | if (options.use_login) | |
1278 | hostname = get_remote_name_or_ip(); | |
7368a6c8 | 1279 | /* |
1280 | * Close the connection descriptors; note that this is the child, and | |
1281 | * the server will still have the socket open, and it is important | |
1282 | * that we do not shutdown it. Note that the descriptors cannot be | |
1283 | * closed before building the environment, as we call | |
1284 | * get_remote_ipaddr there. | |
1285 | */ | |
1286 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1287 | close(packet_get_connection_in()); | |
1288 | else { | |
1289 | close(packet_get_connection_in()); | |
1290 | close(packet_get_connection_out()); | |
1291 | } | |
1292 | /* | |
1293 | * Close all descriptors related to channels. They will still remain | |
1294 | * open in the parent. | |
1295 | */ | |
1296 | /* XXX better use close-on-exec? -markus */ | |
1297 | channel_close_all(); | |
1298 | ||
1299 | /* | |
1300 | * Close any extra file descriptors. Note that there may still be | |
1301 | * descriptors left by system functions. They will be closed later. | |
1302 | */ | |
1303 | endpwent(); | |
1304 | ||
1305 | /* | |
1306 | * Close any extra open file descriptors so that we don\'t have them | |
1307 | * hanging around in clients. Note that we want to do this after | |
1308 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1309 | * descriptors open. | |
1310 | */ | |
1311 | for (i = 3; i < 64; i++) | |
1312 | close(i); | |
1313 | ||
1314 | /* Change current directory to the user\'s home directory. */ | |
2e73a022 | 1315 | if (chdir(pw->pw_dir) < 0) { |
7368a6c8 | 1316 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", |
1317 | pw->pw_dir, strerror(errno)); | |
2e73a022 | 1318 | #ifdef HAVE_LOGIN_CAP |
1319 | if (login_getcapbool(lc, "requirehome", 0)) | |
1320 | exit(1); | |
1321 | #endif | |
1322 | } | |
7368a6c8 | 1323 | |
1324 | /* | |
1325 | * Must take new environment into use so that .ssh/rc, /etc/sshrc and | |
1326 | * xauth are run in the proper environment. | |
1327 | */ | |
1328 | environ = env; | |
1329 | ||
1330 | /* | |
1331 | * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first | |
1332 | * in this order). | |
1333 | */ | |
1334 | if (!options.use_login) { | |
1335 | if (stat(SSH_USER_RC, &st) >= 0) { | |
1336 | if (debug_flag) | |
30228d7c | 1337 | fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_USER_RC); |
7368a6c8 | 1338 | |
30228d7c | 1339 | f = popen(_PATH_BSHELL " " SSH_USER_RC, "w"); |
7368a6c8 | 1340 | if (f) { |
1341 | if (auth_proto != NULL && auth_data != NULL) | |
1342 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1343 | pclose(f); | |
1344 | } else | |
1345 | fprintf(stderr, "Could not run %s\n", SSH_USER_RC); | |
1346 | } else if (stat(SSH_SYSTEM_RC, &st) >= 0) { | |
1347 | if (debug_flag) | |
30228d7c | 1348 | fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_SYSTEM_RC); |
7368a6c8 | 1349 | |
30228d7c | 1350 | f = popen(_PATH_BSHELL " " SSH_SYSTEM_RC, "w"); |
7368a6c8 | 1351 | if (f) { |
1352 | if (auth_proto != NULL && auth_data != NULL) | |
1353 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1354 | pclose(f); | |
1355 | } else | |
1356 | fprintf(stderr, "Could not run %s\n", SSH_SYSTEM_RC); | |
6fc1e9f3 | 1357 | } else if (options.xauth_location != NULL) { |
7368a6c8 | 1358 | /* Add authority data to .Xauthority if appropriate. */ |
1359 | if (auth_proto != NULL && auth_data != NULL) { | |
29611d9c | 1360 | char *screen = strchr(display, ':'); |
1361 | if (debug_flag) { | |
71276795 | 1362 | fprintf(stderr, |
1363 | "Running %.100s add %.100s %.100s %.100s\n", | |
6fc1e9f3 | 1364 | options.xauth_location, display, |
1365 | auth_proto, auth_data); | |
7322ef0e | 1366 | #ifndef HAVE_CYGWIN /* Unix sockets are not supported */ |
29611d9c | 1367 | if (screen != NULL) |
71276795 | 1368 | fprintf(stderr, |
1369 | "Adding %.*s/unix%s %s %s\n", | |
14a9a859 | 1370 | (int)(screen-display), display, |
71276795 | 1371 | screen, auth_proto, auth_data); |
7322ef0e | 1372 | #endif |
29611d9c | 1373 | } |
6fc1e9f3 | 1374 | snprintf(cmd, sizeof cmd, "%s -q -", |
1375 | options.xauth_location); | |
1376 | f = popen(cmd, "w"); | |
7368a6c8 | 1377 | if (f) { |
71276795 | 1378 | fprintf(f, "add %s %s %s\n", display, |
1379 | auth_proto, auth_data); | |
7322ef0e | 1380 | #ifndef HAVE_CYGWIN /* Unix sockets are not supported */ |
29611d9c | 1381 | if (screen != NULL) |
1382 | fprintf(f, "add %.*s/unix%s %s %s\n", | |
14a9a859 | 1383 | (int)(screen-display), display, |
71276795 | 1384 | screen, auth_proto, auth_data); |
7322ef0e | 1385 | #endif |
7368a6c8 | 1386 | pclose(f); |
6fc1e9f3 | 1387 | } else { |
1388 | fprintf(stderr, "Could not run %s\n", | |
1389 | cmd); | |
1390 | } | |
7368a6c8 | 1391 | } |
1392 | } | |
7368a6c8 | 1393 | /* Get the last component of the shell name. */ |
1394 | cp = strrchr(shell, '/'); | |
1395 | if (cp) | |
1396 | cp++; | |
1397 | else | |
1398 | cp = shell; | |
1399 | } | |
1400 | /* | |
1401 | * If we have no command, execute the shell. In this case, the shell | |
1402 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1403 | * this is a login shell. | |
1404 | */ | |
1405 | if (!command) { | |
1406 | if (!options.use_login) { | |
1407 | char buf[256]; | |
1408 | ||
1409 | /* | |
1410 | * Check for mail if we have a tty and it was enabled | |
1411 | * in server options. | |
1412 | */ | |
1413 | if (ttyname && options.check_mail) { | |
1414 | char *mailbox; | |
1415 | struct stat mailstat; | |
1416 | mailbox = getenv("MAIL"); | |
1417 | if (mailbox != NULL) { | |
71276795 | 1418 | if (stat(mailbox, &mailstat) != 0 || |
1419 | mailstat.st_size == 0) | |
7368a6c8 | 1420 | printf("No mail.\n"); |
1421 | else if (mailstat.st_mtime < mailstat.st_atime) | |
1422 | printf("You have mail.\n"); | |
1423 | else | |
1424 | printf("You have new mail.\n"); | |
1425 | } | |
1426 | } | |
1427 | /* Start the shell. Set initial character to '-'. */ | |
1428 | buf[0] = '-'; | |
1429 | strncpy(buf + 1, cp, sizeof(buf) - 1); | |
1430 | buf[sizeof(buf) - 1] = 0; | |
1431 | ||
1432 | /* Execute the shell. */ | |
1433 | argv[0] = buf; | |
1434 | argv[1] = NULL; | |
1435 | execve(shell, argv, env); | |
1436 | ||
1437 | /* Executing the shell failed. */ | |
1438 | perror(shell); | |
1439 | exit(1); | |
1440 | ||
1441 | } else { | |
1442 | /* Launch login(1). */ | |
1443 | ||
2e73a022 | 1444 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
c345cf9d | 1445 | "-p", "-f", "--", pw->pw_name, NULL); |
7368a6c8 | 1446 | |
1447 | /* Login couldn't be executed, die. */ | |
1448 | ||
1449 | perror("login"); | |
1450 | exit(1); | |
1451 | } | |
1452 | } | |
1453 | /* | |
1454 | * Execute the command using the user's shell. This uses the -c | |
1455 | * option to execute the command. | |
1456 | */ | |
1457 | argv[0] = (char *) cp; | |
1458 | argv[1] = "-c"; | |
1459 | argv[2] = (char *) command; | |
1460 | argv[3] = NULL; | |
1461 | execve(shell, argv, env); | |
1462 | perror(shell); | |
1463 | exit(1); | |
1464 | } | |
1465 | ||
1466 | Session * | |
1467 | session_new(void) | |
1468 | { | |
1469 | int i; | |
1470 | static int did_init = 0; | |
1471 | if (!did_init) { | |
1472 | debug("session_new: init"); | |
1473 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1474 | sessions[i].used = 0; | |
1475 | sessions[i].self = i; | |
1476 | } | |
1477 | did_init = 1; | |
1478 | } | |
1479 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1480 | Session *s = &sessions[i]; | |
1481 | if (! s->used) { | |
1482 | s->pid = 0; | |
0b242b12 | 1483 | s->extended = 0; |
7368a6c8 | 1484 | s->chanid = -1; |
1485 | s->ptyfd = -1; | |
1486 | s->ttyfd = -1; | |
1487 | s->term = NULL; | |
1488 | s->pw = NULL; | |
1489 | s->display = NULL; | |
1490 | s->screen = 0; | |
1491 | s->auth_data = NULL; | |
1492 | s->auth_proto = NULL; | |
1493 | s->used = 1; | |
0b242b12 | 1494 | s->pw = NULL; |
02323c45 | 1495 | debug("session_new: session %d", i); |
7368a6c8 | 1496 | return s; |
1497 | } | |
1498 | } | |
1499 | return NULL; | |
1500 | } | |
1501 | ||
1502 | void | |
1503 | session_dump(void) | |
1504 | { | |
1505 | int i; | |
1506 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1507 | Session *s = &sessions[i]; | |
1508 | debug("dump: used %d session %d %p channel %d pid %d", | |
1509 | s->used, | |
1510 | s->self, | |
1511 | s, | |
1512 | s->chanid, | |
1513 | s->pid); | |
1514 | } | |
1515 | } | |
1516 | ||
e78a59f5 | 1517 | int |
1518 | session_open(int chanid) | |
1519 | { | |
1520 | Session *s = session_new(); | |
1521 | debug("session_open: channel %d", chanid); | |
1522 | if (s == NULL) { | |
1523 | error("no more sessions"); | |
1524 | return 0; | |
1525 | } | |
e78a59f5 | 1526 | s->pw = auth_get_user(); |
1527 | if (s->pw == NULL) | |
0b242b12 | 1528 | fatal("no user for session %i", s->self); |
1529 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1530 | s->chanid = chanid; | |
e78a59f5 | 1531 | return 1; |
1532 | } | |
1533 | ||
1534 | Session * | |
1535 | session_by_channel(int id) | |
1536 | { | |
1537 | int i; | |
1538 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1539 | Session *s = &sessions[i]; | |
1540 | if (s->used && s->chanid == id) { | |
1541 | debug("session_by_channel: session %d channel %d", i, id); | |
1542 | return s; | |
1543 | } | |
1544 | } | |
1545 | debug("session_by_channel: unknown channel %d", id); | |
1546 | session_dump(); | |
1547 | return NULL; | |
1548 | } | |
1549 | ||
1550 | Session * | |
1551 | session_by_pid(pid_t pid) | |
1552 | { | |
1553 | int i; | |
1554 | debug("session_by_pid: pid %d", pid); | |
1555 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1556 | Session *s = &sessions[i]; | |
1557 | if (s->used && s->pid == pid) | |
1558 | return s; | |
1559 | } | |
1560 | error("session_by_pid: unknown pid %d", pid); | |
1561 | session_dump(); | |
1562 | return NULL; | |
1563 | } | |
1564 | ||
1565 | int | |
1566 | session_window_change_req(Session *s) | |
1567 | { | |
1568 | s->col = packet_get_int(); | |
1569 | s->row = packet_get_int(); | |
1570 | s->xpixel = packet_get_int(); | |
1571 | s->ypixel = packet_get_int(); | |
6ae2364d | 1572 | packet_done(); |
e78a59f5 | 1573 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1574 | return 1; | |
1575 | } | |
1576 | ||
1577 | int | |
1578 | session_pty_req(Session *s) | |
1579 | { | |
1580 | unsigned int len; | |
6ae2364d | 1581 | char *term_modes; /* encoded terminal modes */ |
e78a59f5 | 1582 | |
38c295d6 | 1583 | if (no_pty_flag) |
1584 | return 0; | |
e78a59f5 | 1585 | if (s->ttyfd != -1) |
6ae2364d | 1586 | return 0; |
e78a59f5 | 1587 | s->term = packet_get_string(&len); |
1588 | s->col = packet_get_int(); | |
1589 | s->row = packet_get_int(); | |
1590 | s->xpixel = packet_get_int(); | |
1591 | s->ypixel = packet_get_int(); | |
6ae2364d | 1592 | term_modes = packet_get_string(&len); |
1593 | packet_done(); | |
e78a59f5 | 1594 | |
1595 | if (strcmp(s->term, "") == 0) { | |
1596 | xfree(s->term); | |
1597 | s->term = NULL; | |
1598 | } | |
1599 | /* Allocate a pty and open it. */ | |
1600 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) { | |
1601 | xfree(s->term); | |
1602 | s->term = NULL; | |
1603 | s->ptyfd = -1; | |
1604 | s->ttyfd = -1; | |
1605 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1606 | xfree(term_modes); |
1607 | return 0; | |
e78a59f5 | 1608 | } |
1609 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1610 | /* | |
1611 | * Add a cleanup function to clear the utmp entry and record logout | |
1612 | * time in case we call fatal() (e.g., the connection gets closed). | |
1613 | */ | |
1614 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
1615 | pty_setowner(s->pw, s->tty); | |
1616 | /* Get window size from the packet. */ | |
1617 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1618 | ||
1d1ffb87 | 1619 | session_proctitle(s); |
1620 | ||
35484284 | 1621 | /* XXX parse and set terminal modes */ |
1622 | xfree(term_modes); | |
e78a59f5 | 1623 | return 1; |
1624 | } | |
1625 | ||
0b242b12 | 1626 | int |
1627 | session_subsystem_req(Session *s) | |
1628 | { | |
1629 | unsigned int len; | |
1630 | int success = 0; | |
1631 | char *subsys = packet_get_string(&len); | |
38c295d6 | 1632 | int i; |
0b242b12 | 1633 | |
1634 | packet_done(); | |
1635 | log("subsystem request for %s", subsys); | |
1636 | ||
38c295d6 | 1637 | for (i = 0; i < options.num_subsystems; i++) { |
1638 | if(strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1639 | debug("subsystem: exec() %s", options.subsystem_command[i]); | |
1640 | do_exec_no_pty(s, options.subsystem_command[i], s->pw); | |
1641 | success = 1; | |
1642 | } | |
1643 | } | |
1644 | ||
1645 | if (!success) | |
1646 | log("subsystem request for %s failed, subsystem not found", subsys); | |
1647 | ||
0b242b12 | 1648 | xfree(subsys); |
1649 | return success; | |
1650 | } | |
1651 | ||
1652 | int | |
1653 | session_x11_req(Session *s) | |
1654 | { | |
b5e300c2 | 1655 | int fd; |
089fbbd2 | 1656 | if (no_x11_forwarding_flag) { |
38c295d6 | 1657 | debug("X11 forwarding disabled in user configuration file."); |
1658 | return 0; | |
1659 | } | |
0b242b12 | 1660 | if (!options.x11_forwarding) { |
1661 | debug("X11 forwarding disabled in server configuration file."); | |
1662 | return 0; | |
1663 | } | |
1664 | if (xauthfile != NULL) { | |
1665 | debug("X11 fwd already started."); | |
1666 | return 0; | |
1667 | } | |
1668 | ||
1669 | debug("Received request for X11 forwarding with auth spoofing."); | |
1670 | if (s->display != NULL) | |
1671 | packet_disconnect("Protocol error: X11 display already set."); | |
1672 | ||
1673 | s->single_connection = packet_get_char(); | |
1674 | s->auth_proto = packet_get_string(NULL); | |
1675 | s->auth_data = packet_get_string(NULL); | |
1676 | s->screen = packet_get_int(); | |
1677 | packet_done(); | |
1678 | ||
1679 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
1680 | if (s->display == NULL) { | |
1681 | xfree(s->auth_proto); | |
1682 | xfree(s->auth_data); | |
1683 | return 0; | |
1684 | } | |
1685 | xauthfile = xmalloc(MAXPATHLEN); | |
1686 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
1687 | temporarily_use_uid(s->pw->pw_uid); | |
1688 | if (mkdtemp(xauthfile) == NULL) { | |
1689 | restore_uid(); | |
1690 | error("private X11 dir: mkdtemp %s failed: %s", | |
1691 | xauthfile, strerror(errno)); | |
1692 | xfree(xauthfile); | |
1693 | xauthfile = NULL; | |
1694 | xfree(s->auth_proto); | |
1695 | xfree(s->auth_data); | |
1696 | /* XXXX remove listening channels */ | |
1697 | return 0; | |
1698 | } | |
1699 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
b5e300c2 | 1700 | fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); |
1701 | if (fd >= 0) | |
1702 | close(fd); | |
0b242b12 | 1703 | restore_uid(); |
1704 | fatal_add_cleanup(xauthfile_cleanup_proc, s); | |
1705 | return 1; | |
1706 | } | |
1707 | ||
38c295d6 | 1708 | int |
1709 | session_shell_req(Session *s) | |
1710 | { | |
1711 | /* if forced_command == NULL, the shell is execed */ | |
1712 | char *shell = forced_command; | |
1713 | packet_done(); | |
1714 | s->extended = 1; | |
1715 | if (s->ttyfd == -1) | |
1716 | do_exec_no_pty(s, shell, s->pw); | |
1717 | else | |
1718 | do_exec_pty(s, shell, s->pw); | |
1719 | return 1; | |
1720 | } | |
1721 | ||
1722 | int | |
1723 | session_exec_req(Session *s) | |
1724 | { | |
1725 | unsigned int len; | |
1726 | char *command = packet_get_string(&len); | |
1727 | packet_done(); | |
1728 | if (forced_command) { | |
b5e300c2 | 1729 | original_command = command; |
38c295d6 | 1730 | command = forced_command; |
1731 | debug("Forced command '%.500s'", forced_command); | |
1732 | } | |
1733 | s->extended = 1; | |
1734 | if (s->ttyfd == -1) | |
1735 | do_exec_no_pty(s, command, s->pw); | |
1736 | else | |
1737 | do_exec_pty(s, command, s->pw); | |
1738 | if (forced_command == NULL) | |
1739 | xfree(command); | |
1740 | return 1; | |
1741 | } | |
1742 | ||
fa08c86b | 1743 | int |
1744 | session_auth_agent_req(Session *s) | |
1745 | { | |
1746 | static int called = 0; | |
1747 | packet_done(); | |
d343d900 | 1748 | if (no_agent_forwarding_flag) { |
1749 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1750 | return 0; | |
1751 | } | |
fa08c86b | 1752 | if (called) { |
1753 | return 0; | |
1754 | } else { | |
1755 | called = 1; | |
1756 | return auth_input_request_forwarding(s->pw); | |
1757 | } | |
1758 | } | |
1759 | ||
e78a59f5 | 1760 | void |
1761 | session_input_channel_req(int id, void *arg) | |
1762 | { | |
1763 | unsigned int len; | |
1764 | int reply; | |
1765 | int success = 0; | |
1766 | char *rtype; | |
1767 | Session *s; | |
1768 | Channel *c; | |
1769 | ||
1770 | rtype = packet_get_string(&len); | |
1771 | reply = packet_get_char(); | |
1772 | ||
1773 | s = session_by_channel(id); | |
1774 | if (s == NULL) | |
1775 | fatal("session_input_channel_req: channel %d: no session", id); | |
1776 | c = channel_lookup(id); | |
1777 | if (c == NULL) | |
1778 | fatal("session_input_channel_req: channel %d: bad channel", id); | |
1779 | ||
1780 | debug("session_input_channel_req: session %d channel %d request %s reply %d", | |
1781 | s->self, id, rtype, reply); | |
1782 | ||
1783 | /* | |
1784 | * a session is in LARVAL state until a shell | |
1785 | * or programm is executed | |
1786 | */ | |
1787 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1788 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1789 | success = session_shell_req(s); |
e78a59f5 | 1790 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1791 | success = session_exec_req(s); |
e78a59f5 | 1792 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1793 | success = session_pty_req(s); |
0b242b12 | 1794 | } else if (strcmp(rtype, "x11-req") == 0) { |
1795 | success = session_x11_req(s); | |
fa08c86b | 1796 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
1797 | success = session_auth_agent_req(s); | |
0b242b12 | 1798 | } else if (strcmp(rtype, "subsystem") == 0) { |
1799 | success = session_subsystem_req(s); | |
e78a59f5 | 1800 | } |
1801 | } | |
1802 | if (strcmp(rtype, "window-change") == 0) { | |
1803 | success = session_window_change_req(s); | |
1804 | } | |
1805 | ||
1806 | if (reply) { | |
1807 | packet_start(success ? | |
1808 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1809 | packet_put_int(c->remote_id); | |
1810 | packet_send(); | |
1811 | } | |
1812 | xfree(rtype); | |
1813 | } | |
1814 | ||
1815 | void | |
1816 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1817 | { | |
1818 | if (!compat20) | |
1819 | fatal("session_set_fds: called for proto != 2.0"); | |
1820 | /* | |
1821 | * now that have a child and a pipe to the child, | |
1822 | * we can activate our channel and register the fd's | |
1823 | */ | |
1824 | if (s->chanid == -1) | |
1825 | fatal("no channel for session %d", s->self); | |
1826 | channel_set_fds(s->chanid, | |
1827 | fdout, fdin, fderr, | |
a22aff1f | 1828 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
1829 | 1); | |
e78a59f5 | 1830 | } |
1831 | ||
7368a6c8 | 1832 | void |
1833 | session_pty_cleanup(Session *s) | |
1834 | { | |
1835 | if (s == NULL || s->ttyfd == -1) | |
1836 | return; | |
1837 | ||
1838 | debug("session_pty_cleanup: session %i release %s", s->self, s->tty); | |
1839 | ||
1840 | /* Cancel the cleanup function. */ | |
1841 | fatal_remove_cleanup(pty_cleanup_proc, (void *)s); | |
1842 | ||
1843 | /* Record that the user has logged out. */ | |
1844 | record_logout(s->pid, s->tty); | |
1845 | ||
1846 | /* Release the pseudo-tty. */ | |
1847 | pty_release(s->tty); | |
1848 | ||
1849 | /* | |
1850 | * Close the server side of the socket pairs. We must do this after | |
1851 | * the pty cleanup, so that another process doesn't get this pty | |
1852 | * while we're still cleaning up. | |
1853 | */ | |
1854 | if (close(s->ptymaster) < 0) | |
1855 | error("close(s->ptymaster): %s", strerror(errno)); | |
1856 | } | |
e78a59f5 | 1857 | |
1858 | void | |
1859 | session_exit_message(Session *s, int status) | |
1860 | { | |
1861 | Channel *c; | |
1862 | if (s == NULL) | |
1863 | fatal("session_close: no session"); | |
1864 | c = channel_lookup(s->chanid); | |
1865 | if (c == NULL) | |
1866 | fatal("session_close: session %d: no channel %d", | |
1867 | s->self, s->chanid); | |
1868 | debug("session_exit_message: session %d channel %d pid %d", | |
1869 | s->self, s->chanid, s->pid); | |
1870 | ||
1871 | if (WIFEXITED(status)) { | |
1872 | channel_request_start(s->chanid, | |
1873 | "exit-status", 0); | |
1874 | packet_put_int(WEXITSTATUS(status)); | |
1875 | packet_send(); | |
1876 | } else if (WIFSIGNALED(status)) { | |
1877 | channel_request_start(s->chanid, | |
1878 | "exit-signal", 0); | |
1879 | packet_put_int(WTERMSIG(status)); | |
a64009ad | 1880 | #ifdef WCOREDUMP |
e78a59f5 | 1881 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1882 | #else /* WCOREDUMP */ |
1883 | packet_put_char(0); | |
1884 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1885 | packet_put_cstring(""); |
1886 | packet_put_cstring(""); | |
1887 | packet_send(); | |
1888 | } else { | |
1889 | /* Some weird exit cause. Just exit. */ | |
1890 | packet_disconnect("wait returned status %04x.", status); | |
1891 | } | |
1892 | ||
1893 | /* disconnect channel */ | |
1894 | debug("session_exit_message: release channel %d", s->chanid); | |
1895 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1896 | /* |
1897 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1898 | * interested in data we write. | |
1899 | * Note that we must not call 'chan_read_failed', since there could | |
1900 | * be some more data waiting in the pipe. | |
4d670c24 | 1901 | * djm - This is no longer true as we have allowed one pass through |
1902 | * the select loop before killing the connection | |
9da5c3c9 | 1903 | */ |
0b242b12 | 1904 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1905 | chan_write_failed(c); | |
4d670c24 | 1906 | if (c->istate != CHAN_INPUT_CLOSED) |
1907 | chan_read_failed(c); | |
e78a59f5 | 1908 | s->chanid = -1; |
1909 | } | |
1910 | ||
1911 | void | |
1912 | session_free(Session *s) | |
1913 | { | |
1914 | debug("session_free: session %d pid %d", s->self, s->pid); | |
1915 | if (s->term) | |
1916 | xfree(s->term); | |
1917 | if (s->display) | |
1918 | xfree(s->display); | |
1919 | if (s->auth_data) | |
1920 | xfree(s->auth_data); | |
1921 | if (s->auth_proto) | |
1922 | xfree(s->auth_proto); | |
1923 | s->used = 0; | |
1924 | } | |
1925 | ||
1926 | void | |
1927 | session_close(Session *s) | |
1928 | { | |
1929 | session_pty_cleanup(s); | |
1930 | session_free(s); | |
1d1ffb87 | 1931 | session_proctitle(s); |
e78a59f5 | 1932 | } |
1933 | ||
1934 | void | |
1935 | session_close_by_pid(pid_t pid, int status) | |
1936 | { | |
1937 | Session *s = session_by_pid(pid); | |
1938 | if (s == NULL) { | |
1939 | debug("session_close_by_pid: no session for pid %d", s->pid); | |
1940 | return; | |
1941 | } | |
1942 | if (s->chanid != -1) | |
1943 | session_exit_message(s, status); | |
1944 | session_close(s); | |
1945 | } | |
1946 | ||
1947 | /* | |
1948 | * this is called when a channel dies before | |
1949 | * the session 'child' itself dies | |
1950 | */ | |
1951 | void | |
1952 | session_close_by_channel(int id, void *arg) | |
1953 | { | |
1954 | Session *s = session_by_channel(id); | |
1955 | if (s == NULL) { | |
1956 | debug("session_close_by_channel: no session for channel %d", id); | |
1957 | return; | |
1958 | } | |
1959 | /* disconnect channel */ | |
1960 | channel_cancel_cleanup(s->chanid); | |
1961 | s->chanid = -1; | |
1962 | ||
1963 | debug("session_close_by_channel: channel %d kill %d", id, s->pid); | |
1964 | if (s->pid == 0) { | |
1965 | /* close session immediately */ | |
1966 | session_close(s); | |
1967 | } else { | |
1968 | /* notify child, delay session cleanup */ | |
f528fdf2 | 1969 | if (s->pid <= 1) |
512ad3c0 | 1970 | fatal("session_close_by_channel: Unsafe s->pid = %d", s->pid); |
1971 | if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0) | |
e78a59f5 | 1972 | error("session_close_by_channel: kill %d: %s", |
1973 | s->pid, strerror(errno)); | |
1974 | } | |
1975 | } | |
1976 | ||
1d1ffb87 | 1977 | char * |
1978 | session_tty_list(void) | |
1979 | { | |
1980 | static char buf[1024]; | |
1981 | int i; | |
1982 | buf[0] = '\0'; | |
1983 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1984 | Session *s = &sessions[i]; | |
1985 | if (s->used && s->ttyfd != -1) { | |
1986 | if (buf[0] != '\0') | |
1987 | strlcat(buf, ",", sizeof buf); | |
1988 | strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf); | |
1989 | } | |
1990 | } | |
1991 | if (buf[0] == '\0') | |
1992 | strlcpy(buf, "notty", sizeof buf); | |
1993 | return buf; | |
1994 | } | |
1995 | ||
1996 | void | |
1997 | session_proctitle(Session *s) | |
1998 | { | |
1999 | if (s->pw == NULL) | |
2000 | error("no user for session %d", s->self); | |
2001 | else | |
2002 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2003 | } | |
2004 | ||
e78a59f5 | 2005 | void |
2006 | do_authenticated2(void) | |
2007 | { | |
0b65b628 | 2008 | #ifdef HAVE_LOGIN_CAP |
2e73a022 | 2009 | struct passwd *pw; |
0b65b628 | 2010 | #endif |
2e73a022 | 2011 | |
e78a59f5 | 2012 | /* |
2013 | * Cancel the alarm we set to limit the time taken for | |
2014 | * authentication. | |
2015 | */ | |
2016 | alarm(0); | |
3f7a7e4a | 2017 | if (startup_pipe != -1) { |
5540ea9b | 2018 | close(startup_pipe); |
3f7a7e4a | 2019 | startup_pipe = -1; |
2020 | } | |
97994d32 | 2021 | #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD) |
2e73a022 | 2022 | pw = auth_get_user(); |
2023 | if ((lc = login_getclass(pw->pw_class)) == NULL) { | |
2024 | error("unable to get login class"); | |
2025 | return; | |
2026 | } | |
2027 | #endif | |
e78a59f5 | 2028 | server_loop2(); |
34bce9a5 | 2029 | if (xauthfile) |
2030 | xauthfile_cleanup_proc(NULL); | |
e78a59f5 | 2031 | } |