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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. |
f3c7c613 | 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" | |
503e7e5b | 36 | RCSID("$OpenBSD: session.c,v 1.75 2001/05/03 15:45:15 markus Exp $"); |
7368a6c8 | 37 | |
7368a6c8 | 38 | #include "ssh.h" |
42f11eb2 | 39 | #include "ssh1.h" |
40 | #include "ssh2.h" | |
41 | #include "xmalloc.h" | |
1729c161 | 42 | #include "sshpty.h" |
7368a6c8 | 43 | #include "packet.h" |
44 | #include "buffer.h" | |
7368a6c8 | 45 | #include "mpaux.h" |
7368a6c8 | 46 | #include "uidswap.h" |
47 | #include "compat.h" | |
48 | #include "channels.h" | |
49 | #include "nchan.h" | |
e78a59f5 | 50 | #include "bufaux.h" |
e78a59f5 | 51 | #include "auth.h" |
38c295d6 | 52 | #include "auth-options.h" |
42f11eb2 | 53 | #include "pathnames.h" |
54 | #include "log.h" | |
55 | #include "servconf.h" | |
1729c161 | 56 | #include "sshlogin.h" |
42f11eb2 | 57 | #include "serverloop.h" |
58 | #include "canohost.h" | |
5ca51e19 | 59 | #include "session.h" |
e78a59f5 | 60 | |
3206bb3b | 61 | #ifdef WITH_IRIX_PROJECT |
62 | #include <proj.h> | |
63 | #endif /* WITH_IRIX_PROJECT */ | |
d287c664 | 64 | #ifdef WITH_IRIX_JOBS |
65 | #include <sys/resource.h> | |
2b87da3b | 66 | #endif |
260d427b | 67 | #ifdef WITH_IRIX_AUDIT |
68 | #include <sat.h> | |
69 | #endif /* WITH_IRIX_AUDIT */ | |
3206bb3b | 70 | |
089fbbd2 | 71 | #if defined(HAVE_USERSEC_H) |
72 | #include <usersec.h> | |
73 | #endif | |
74 | ||
3c62e7eb | 75 | #ifdef HAVE_CYGWIN |
76 | #include <windows.h> | |
77 | #include <sys/cygwin.h> | |
78 | #define is_winnt (GetVersion() < 0x80000000) | |
79 | #endif | |
80 | ||
3fcce26c | 81 | /* AIX limits */ |
82 | #if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE) | |
2a2cb9e7 | 83 | # define S_UFSIZE_HARD S_UFSIZE "_hard" |
84 | # define S_UCPU_HARD S_UCPU "_hard" | |
85 | # define S_UDATA_HARD S_UDATA "_hard" | |
86 | # define S_USTACK_HARD S_USTACK "_hard" | |
87 | # define S_URSS_HARD S_URSS "_hard" | |
88 | # define S_UCORE_HARD S_UCORE "_hard" | |
89 | # define S_UNOFILE_HARD S_UNOFILE "_hard" | |
3fcce26c | 90 | #endif |
91 | ||
8a968c25 | 92 | #ifdef _AIX |
93 | # include <uinfo.h> | |
94 | #endif | |
95 | ||
7368a6c8 | 96 | /* types */ |
97 | ||
98 | #define TTYSZ 64 | |
99 | typedef struct Session Session; | |
100 | struct Session { | |
101 | int used; | |
102 | int self; | |
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; | |
e5d7a405 | 118 | int is_subsystem; |
7368a6c8 | 119 | }; |
120 | ||
121 | /* func */ | |
122 | ||
123 | Session *session_new(void); | |
124 | void session_set_fds(Session *s, int fdin, int fdout, int fderr); | |
125 | void session_pty_cleanup(Session *s); | |
1d1ffb87 | 126 | void session_proctitle(Session *s); |
65068d16 | 127 | void do_exec_pty(Session *s, const char *command); |
128 | void do_exec_no_pty(Session *s, const char *command); | |
a22aff1f | 129 | void do_login(Session *s, const char *command); |
56b3e9ce | 130 | void do_child(Session *s, const char *command); |
f2c2fd71 | 131 | void do_motd(void); |
132 | int check_quietlogin(Session *s, const char *command); | |
7368a6c8 | 133 | |
bb5639fe | 134 | void do_authenticated1(Authctxt *authctxt); |
135 | void do_authenticated2(Authctxt *authctxt); | |
136 | ||
7368a6c8 | 137 | /* import */ |
138 | extern ServerOptions options; | |
139 | extern char *__progname; | |
140 | extern int log_stderr; | |
141 | extern int debug_flag; | |
1e3b8b07 | 142 | extern u_int utmp_len; |
089fbbd2 | 143 | extern int startup_pipe; |
e78e738a | 144 | extern void destroy_sensitive_data(void); |
089fbbd2 | 145 | |
7368a6c8 | 146 | /* Local Xauthority file. */ |
147 | static char *xauthfile; | |
148 | ||
b5e300c2 | 149 | /* original command from peer. */ |
2b87da3b | 150 | char *original_command = NULL; |
b5e300c2 | 151 | |
7368a6c8 | 152 | /* data */ |
153 | #define MAX_SESSIONS 10 | |
154 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 155 | |
c1ef8333 | 156 | #ifdef WITH_AIXAUTHENTICATE |
157 | /* AIX's lastlogin message, set in auth1.c */ | |
158 | char *aixloginmsg; | |
159 | #endif /* WITH_AIXAUTHENTICATE */ | |
7368a6c8 | 160 | |
2e73a022 | 161 | #ifdef HAVE_LOGIN_CAP |
162 | static login_cap_t *lc; | |
163 | #endif | |
164 | ||
bb5639fe | 165 | void |
166 | do_authenticated(Authctxt *authctxt) | |
167 | { | |
168 | /* | |
169 | * Cancel the alarm we set to limit the time taken for | |
170 | * authentication. | |
171 | */ | |
172 | alarm(0); | |
173 | if (startup_pipe != -1) { | |
174 | close(startup_pipe); | |
175 | startup_pipe = -1; | |
176 | } | |
177 | #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD) | |
178 | if ((lc = login_getclass(authctxt->pw->pw_class)) == NULL) { | |
179 | error("unable to get login class"); | |
180 | return; | |
181 | } | |
e78e738a | 182 | #ifdef BSD_AUTH |
183 | if (auth_approval(NULL, lc, authctxt->pw->pw_name, "ssh") <= 0) { | |
184 | packet_disconnect("Approval failure for %s", | |
185 | authctxt->pw->pw_name); | |
186 | } | |
187 | #endif | |
bb5639fe | 188 | #endif |
189 | /* setup the channel layer */ | |
190 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
191 | channel_permit_all_opens(); | |
192 | ||
193 | if (compat20) | |
194 | do_authenticated2(authctxt); | |
195 | else | |
196 | do_authenticated1(authctxt); | |
197 | } | |
198 | ||
7368a6c8 | 199 | /* |
200 | * Remove local Xauthority file. | |
201 | */ | |
202 | void | |
203 | xauthfile_cleanup_proc(void *ignore) | |
204 | { | |
205 | debug("xauthfile_cleanup_proc called"); | |
206 | ||
207 | if (xauthfile != NULL) { | |
208 | char *p; | |
209 | unlink(xauthfile); | |
210 | p = strrchr(xauthfile, '/'); | |
211 | if (p != NULL) { | |
212 | *p = '\0'; | |
213 | rmdir(xauthfile); | |
214 | } | |
215 | xfree(xauthfile); | |
216 | xauthfile = NULL; | |
217 | } | |
218 | } | |
219 | ||
220 | /* | |
221 | * Function to perform cleanup if we get aborted abnormally (e.g., due to a | |
222 | * dropped connection). | |
223 | */ | |
6ae2364d | 224 | void |
7368a6c8 | 225 | pty_cleanup_proc(void *session) |
226 | { | |
227 | Session *s=session; | |
228 | if (s == NULL) | |
229 | fatal("pty_cleanup_proc: no session"); | |
230 | debug("pty_cleanup_proc: %s", s->tty); | |
231 | ||
232 | if (s->pid != 0) { | |
233 | /* Record that the user has logged out. */ | |
234 | record_logout(s->pid, s->tty); | |
235 | } | |
236 | ||
237 | /* Release the pseudo-tty. */ | |
238 | pty_release(s->tty); | |
239 | } | |
240 | ||
241 | /* | |
242 | * Prepares for an interactive session. This is called after the user has | |
243 | * been successfully authenticated. During this message exchange, pseudo | |
244 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
245 | * are requested, etc. | |
246 | */ | |
6ae2364d | 247 | void |
bb5639fe | 248 | do_authenticated1(Authctxt *authctxt) |
7368a6c8 | 249 | { |
250 | Session *s; | |
7368a6c8 | 251 | char *command; |
bb5639fe | 252 | int success, type, fd, n_bytes, plen, screen_flag, have_pty = 0; |
253 | int compression_level = 0, enable_compression_after_reply = 0; | |
1e3b8b07 | 254 | u_int proto_len, data_len, dlen; |
7368a6c8 | 255 | |
256 | s = session_new(); | |
bb5639fe | 257 | s->pw = authctxt->pw; |
2e73a022 | 258 | |
7368a6c8 | 259 | /* |
260 | * We stay in this loop until the client requests to execute a shell | |
261 | * or a command. | |
262 | */ | |
263 | for (;;) { | |
bb5639fe | 264 | success = 0; |
7368a6c8 | 265 | |
266 | /* Get a packet from the client. */ | |
267 | type = packet_read(&plen); | |
268 | ||
269 | /* Process the packet. */ | |
270 | switch (type) { | |
271 | case SSH_CMSG_REQUEST_COMPRESSION: | |
272 | packet_integrity_check(plen, 4, type); | |
273 | compression_level = packet_get_int(); | |
274 | if (compression_level < 1 || compression_level > 9) { | |
275 | packet_send_debug("Received illegal compression level %d.", | |
276 | compression_level); | |
277 | break; | |
278 | } | |
279 | /* Enable compression after we have responded with SUCCESS. */ | |
280 | enable_compression_after_reply = 1; | |
281 | success = 1; | |
282 | break; | |
283 | ||
284 | case SSH_CMSG_REQUEST_PTY: | |
285 | if (no_pty_flag) { | |
286 | debug("Allocating a pty not permitted for this authentication."); | |
287 | break; | |
288 | } | |
289 | if (have_pty) | |
290 | packet_disconnect("Protocol error: you already have a pty."); | |
291 | ||
292 | debug("Allocating pty."); | |
293 | ||
294 | /* Allocate a pty and open it. */ | |
295 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, | |
296 | sizeof(s->tty))) { | |
297 | error("Failed to allocate pty."); | |
298 | break; | |
299 | } | |
300 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
bb5639fe | 301 | pty_setowner(s->pw, s->tty); |
7368a6c8 | 302 | |
303 | /* Get TERM from the packet. Note that the value may be of arbitrary length. */ | |
304 | s->term = packet_get_string(&dlen); | |
305 | packet_integrity_check(dlen, strlen(s->term), type); | |
306 | /* packet_integrity_check(plen, 4 + dlen + 4*4 + n_bytes, type); */ | |
307 | /* Remaining bytes */ | |
308 | n_bytes = plen - (4 + dlen + 4 * 4); | |
309 | ||
310 | if (strcmp(s->term, "") == 0) { | |
311 | xfree(s->term); | |
312 | s->term = NULL; | |
313 | } | |
314 | /* Get window size from the packet. */ | |
315 | s->row = packet_get_int(); | |
316 | s->col = packet_get_int(); | |
317 | s->xpixel = packet_get_int(); | |
318 | s->ypixel = packet_get_int(); | |
319 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
320 | ||
321 | /* Get tty modes from the packet. */ | |
322 | tty_parse_modes(s->ttyfd, &n_bytes); | |
323 | packet_integrity_check(plen, 4 + dlen + 4 * 4 + n_bytes, type); | |
324 | ||
1d1ffb87 | 325 | session_proctitle(s); |
326 | ||
7368a6c8 | 327 | /* Indicate that we now have a pty. */ |
328 | success = 1; | |
329 | have_pty = 1; | |
330 | break; | |
331 | ||
332 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
333 | if (!options.x11_forwarding) { | |
334 | packet_send_debug("X11 forwarding disabled in server configuration file."); | |
335 | break; | |
336 | } | |
6fc1e9f3 | 337 | if (!options.xauth_location) { |
338 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
339 | break; | |
340 | } | |
7368a6c8 | 341 | if (no_x11_forwarding_flag) { |
342 | packet_send_debug("X11 forwarding not permitted for this authentication."); | |
343 | break; | |
344 | } | |
345 | debug("Received request for X11 forwarding with auth spoofing."); | |
346 | if (s->display != NULL) | |
347 | packet_disconnect("Protocol error: X11 display already set."); | |
348 | ||
349 | s->auth_proto = packet_get_string(&proto_len); | |
350 | s->auth_data = packet_get_string(&data_len); | |
7368a6c8 | 351 | |
2af09193 | 352 | screen_flag = packet_get_protocol_flags() & |
353 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
354 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
355 | ||
356 | if (packet_remaining() == 4) { | |
357 | if (!screen_flag) | |
358 | debug2("Buggy client: " | |
359 | "X11 screen flag missing"); | |
c8b058b4 | 360 | packet_integrity_check(plen, |
361 | 4 + proto_len + 4 + data_len + 4, type); | |
7368a6c8 | 362 | s->screen = packet_get_int(); |
c8b058b4 | 363 | } else { |
c8b058b4 | 364 | packet_integrity_check(plen, |
365 | 4 + proto_len + 4 + data_len, type); | |
7368a6c8 | 366 | s->screen = 0; |
c8b058b4 | 367 | } |
7368a6c8 | 368 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); |
369 | ||
370 | if (s->display == NULL) | |
371 | break; | |
372 | ||
373 | /* Setup to always have a local .Xauthority. */ | |
374 | xauthfile = xmalloc(MAXPATHLEN); | |
375 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
63bd8c36 | 376 | temporarily_use_uid(s->pw); |
7368a6c8 | 377 | if (mkdtemp(xauthfile) == NULL) { |
378 | restore_uid(); | |
379 | error("private X11 dir: mkdtemp %s failed: %s", | |
380 | xauthfile, strerror(errno)); | |
381 | xfree(xauthfile); | |
382 | xauthfile = NULL; | |
0b242b12 | 383 | /* XXXX remove listening channels */ |
7368a6c8 | 384 | break; |
385 | } | |
386 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
b5e300c2 | 387 | fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); |
388 | if (fd >= 0) | |
389 | close(fd); | |
7368a6c8 | 390 | restore_uid(); |
391 | fatal_add_cleanup(xauthfile_cleanup_proc, NULL); | |
392 | success = 1; | |
393 | break; | |
7368a6c8 | 394 | |
395 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
396 | if (no_agent_forwarding_flag || compat13) { | |
397 | debug("Authentication agent forwarding not permitted for this authentication."); | |
398 | break; | |
399 | } | |
400 | debug("Received authentication agent forwarding request."); | |
bb5639fe | 401 | success = auth_input_request_forwarding(s->pw); |
7368a6c8 | 402 | break; |
403 | ||
404 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
405 | if (no_port_forwarding_flag) { | |
406 | debug("Port forwarding not permitted for this authentication."); | |
407 | break; | |
408 | } | |
33de75a3 | 409 | if (!options.allow_tcp_forwarding) { |
410 | debug("Port forwarding not permitted."); | |
411 | break; | |
412 | } | |
7368a6c8 | 413 | debug("Received TCP/IP port forwarding request."); |
bb5639fe | 414 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 415 | success = 1; |
416 | break; | |
417 | ||
418 | case SSH_CMSG_MAX_PACKET_SIZE: | |
419 | if (packet_set_maxsize(packet_get_int()) > 0) | |
420 | success = 1; | |
421 | break; | |
422 | ||
423 | case SSH_CMSG_EXEC_SHELL: | |
424 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 425 | if (type == SSH_CMSG_EXEC_CMD) { |
426 | command = packet_get_string(&dlen); | |
427 | debug("Exec command '%.500s'", command); | |
428 | packet_integrity_check(plen, 4 + dlen, type); | |
429 | } else { | |
430 | command = NULL; | |
431 | packet_integrity_check(plen, 0, type); | |
432 | } | |
433 | if (forced_command != NULL) { | |
b5e300c2 | 434 | original_command = command; |
7368a6c8 | 435 | command = forced_command; |
436 | debug("Forced command '%.500s'", forced_command); | |
437 | } | |
438 | if (have_pty) | |
65068d16 | 439 | do_exec_pty(s, command); |
7368a6c8 | 440 | else |
65068d16 | 441 | do_exec_no_pty(s, command); |
7368a6c8 | 442 | |
443 | if (command != NULL) | |
444 | xfree(command); | |
445 | /* Cleanup user's local Xauthority file. */ | |
446 | if (xauthfile) | |
447 | xauthfile_cleanup_proc(NULL); | |
448 | return; | |
449 | ||
450 | default: | |
451 | /* | |
452 | * Any unknown messages in this phase are ignored, | |
453 | * and a failure message is returned. | |
454 | */ | |
455 | log("Unknown packet type received after authentication: %d", type); | |
456 | } | |
457 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
458 | packet_send(); | |
459 | packet_write_wait(); | |
460 | ||
461 | /* Enable compression now that we have replied if appropriate. */ | |
462 | if (enable_compression_after_reply) { | |
463 | enable_compression_after_reply = 0; | |
464 | packet_start_compression(compression_level); | |
465 | } | |
466 | } | |
467 | } | |
468 | ||
469 | /* | |
470 | * This is called to fork and execute a command when we have no tty. This | |
471 | * will call do_child from the child, and server_loop from the parent after | |
472 | * setting up file descriptors and such. | |
473 | */ | |
6ae2364d | 474 | void |
65068d16 | 475 | do_exec_no_pty(Session *s, const char *command) |
7368a6c8 | 476 | { |
477 | int pid; | |
478 | ||
479 | #ifdef USE_PIPES | |
480 | int pin[2], pout[2], perr[2]; | |
481 | /* Allocate pipes for communicating with the program. */ | |
482 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
483 | packet_disconnect("Could not create pipes: %.100s", | |
484 | strerror(errno)); | |
485 | #else /* USE_PIPES */ | |
486 | int inout[2], err[2]; | |
487 | /* Uses socket pairs to communicate with the program. */ | |
488 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
489 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
490 | packet_disconnect("Could not create socket pairs: %.100s", | |
491 | strerror(errno)); | |
492 | #endif /* USE_PIPES */ | |
493 | if (s == NULL) | |
494 | fatal("do_exec_no_pty: no session"); | |
495 | ||
1d1ffb87 | 496 | session_proctitle(s); |
7368a6c8 | 497 | |
b19d61d7 | 498 | #if defined(USE_PAM) |
9afbfcfa | 499 | do_pam_setcred(1); |
266140a8 | 500 | #endif /* USE_PAM */ |
501 | ||
7368a6c8 | 502 | /* Fork the child. */ |
503 | if ((pid = fork()) == 0) { | |
504 | /* Child. Reinitialize the log since the pid has changed. */ | |
505 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
506 | ||
507 | /* | |
508 | * Create a new session and process group since the 4.4BSD | |
509 | * setlogin() affects the entire process group. | |
510 | */ | |
511 | if (setsid() < 0) | |
512 | error("setsid failed: %.100s", strerror(errno)); | |
513 | ||
514 | #ifdef USE_PIPES | |
515 | /* | |
516 | * Redirect stdin. We close the parent side of the socket | |
517 | * pair, and make the child side the standard input. | |
518 | */ | |
519 | close(pin[1]); | |
520 | if (dup2(pin[0], 0) < 0) | |
521 | perror("dup2 stdin"); | |
522 | close(pin[0]); | |
523 | ||
524 | /* Redirect stdout. */ | |
525 | close(pout[0]); | |
526 | if (dup2(pout[1], 1) < 0) | |
527 | perror("dup2 stdout"); | |
528 | close(pout[1]); | |
529 | ||
530 | /* Redirect stderr. */ | |
531 | close(perr[0]); | |
532 | if (dup2(perr[1], 2) < 0) | |
533 | perror("dup2 stderr"); | |
534 | close(perr[1]); | |
535 | #else /* USE_PIPES */ | |
536 | /* | |
537 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
538 | * use the same socket, as some programs (particularly rdist) | |
539 | * seem to depend on it. | |
540 | */ | |
541 | close(inout[1]); | |
542 | close(err[1]); | |
543 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
544 | perror("dup2 stdin"); | |
545 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
546 | perror("dup2 stdout"); | |
547 | if (dup2(err[0], 2) < 0) /* stderr */ | |
548 | perror("dup2 stderr"); | |
549 | #endif /* USE_PIPES */ | |
550 | ||
551 | /* Do processing for the child (exec command etc). */ | |
56b3e9ce | 552 | do_child(s, command); |
7368a6c8 | 553 | /* NOTREACHED */ |
554 | } | |
3c62e7eb | 555 | #ifdef HAVE_CYGWIN |
556 | if (is_winnt) | |
557 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
558 | #endif | |
7368a6c8 | 559 | if (pid < 0) |
560 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
561 | s->pid = pid; | |
b5c334cc | 562 | /* Set interactive/non-interactive mode. */ |
563 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 564 | #ifdef USE_PIPES |
565 | /* We are the parent. Close the child sides of the pipes. */ | |
566 | close(pin[0]); | |
567 | close(pout[1]); | |
568 | close(perr[1]); | |
569 | ||
e78a59f5 | 570 | if (compat20) { |
e5d7a405 | 571 | session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]); |
e78a59f5 | 572 | } else { |
573 | /* Enter the interactive session. */ | |
574 | server_loop(pid, pin[1], pout[0], perr[0]); | |
e5d7a405 | 575 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
e78a59f5 | 576 | } |
7368a6c8 | 577 | #else /* USE_PIPES */ |
578 | /* We are the parent. Close the child sides of the socket pairs. */ | |
579 | close(inout[0]); | |
580 | close(err[0]); | |
581 | ||
582 | /* | |
583 | * Enter the interactive session. Note: server_loop must be able to | |
584 | * handle the case that fdin and fdout are the same. | |
585 | */ | |
e78a59f5 | 586 | if (compat20) { |
e5d7a405 | 587 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
e78a59f5 | 588 | } else { |
589 | server_loop(pid, inout[1], inout[1], err[1]); | |
590 | /* server_loop has closed inout[1] and err[1]. */ | |
591 | } | |
7368a6c8 | 592 | #endif /* USE_PIPES */ |
593 | } | |
594 | ||
595 | /* | |
596 | * This is called to fork and execute a command when we have a tty. This | |
597 | * will call do_child from the child, and server_loop from the parent after | |
598 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
599 | * lastlog, and other such operations. | |
600 | */ | |
6ae2364d | 601 | void |
65068d16 | 602 | do_exec_pty(Session *s, const char *command) |
7368a6c8 | 603 | { |
7368a6c8 | 604 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 605 | pid_t pid; |
7368a6c8 | 606 | |
607 | if (s == NULL) | |
608 | fatal("do_exec_pty: no session"); | |
609 | ptyfd = s->ptyfd; | |
610 | ttyfd = s->ttyfd; | |
611 | ||
b19d61d7 | 612 | #if defined(USE_PAM) |
bb5639fe | 613 | do_pam_session(s->pw->pw_name, s->tty); |
9afbfcfa | 614 | do_pam_setcred(1); |
27cf96de | 615 | #endif |
266140a8 | 616 | |
7368a6c8 | 617 | /* Fork the child. */ |
618 | if ((pid = fork()) == 0) { | |
c345cf9d | 619 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 620 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
621 | ||
622 | /* Close the master side of the pseudo tty. */ | |
623 | close(ptyfd); | |
624 | ||
625 | /* Make the pseudo tty our controlling tty. */ | |
626 | pty_make_controlling_tty(&ttyfd, s->tty); | |
627 | ||
628 | /* Redirect stdin from the pseudo tty. */ | |
629 | if (dup2(ttyfd, fileno(stdin)) < 0) | |
630 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
631 | ||
632 | /* Redirect stdout to the pseudo tty. */ | |
633 | if (dup2(ttyfd, fileno(stdout)) < 0) | |
634 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
635 | ||
636 | /* Redirect stderr to the pseudo tty. */ | |
637 | if (dup2(ttyfd, fileno(stderr)) < 0) | |
638 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
639 | ||
640 | /* Close the extra descriptor for the pseudo tty. */ | |
641 | close(ttyfd); | |
642 | ||
c345cf9d | 643 | /* record login, etc. similar to login(1) */ |
c96a4aaf | 644 | #ifndef HAVE_OSF_SIA |
a22aff1f | 645 | if (!(options.use_login && command == NULL)) |
646 | do_login(s, command); | |
c96a4aaf | 647 | #endif |
7368a6c8 | 648 | |
7368a6c8 | 649 | /* Do common processing for the child, such as execing the command. */ |
56b3e9ce | 650 | do_child(s, command); |
7368a6c8 | 651 | /* NOTREACHED */ |
652 | } | |
3c62e7eb | 653 | #ifdef HAVE_CYGWIN |
654 | if (is_winnt) | |
655 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
656 | #endif | |
7368a6c8 | 657 | if (pid < 0) |
658 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
659 | s->pid = pid; | |
660 | ||
661 | /* Parent. Close the slave side of the pseudo tty. */ | |
662 | close(ttyfd); | |
663 | ||
664 | /* | |
665 | * Create another descriptor of the pty master side for use as the | |
666 | * standard input. We could use the original descriptor, but this | |
667 | * simplifies code in server_loop. The descriptor is bidirectional. | |
668 | */ | |
669 | fdout = dup(ptyfd); | |
670 | if (fdout < 0) | |
671 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
672 | ||
673 | /* we keep a reference to the pty master */ | |
674 | ptymaster = dup(ptyfd); | |
675 | if (ptymaster < 0) | |
676 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
677 | s->ptymaster = ptymaster; | |
678 | ||
679 | /* Enter interactive session. */ | |
b5c334cc | 680 | packet_set_interactive(1); |
e78a59f5 | 681 | if (compat20) { |
682 | session_set_fds(s, ptyfd, fdout, -1); | |
683 | } else { | |
684 | server_loop(pid, ptyfd, fdout, -1); | |
685 | /* server_loop _has_ closed ptyfd and fdout. */ | |
686 | session_pty_cleanup(s); | |
687 | } | |
7368a6c8 | 688 | } |
689 | ||
c345cf9d | 690 | /* administrative, login(1)-like work */ |
691 | void | |
a22aff1f | 692 | do_login(Session *s, const char *command) |
c345cf9d | 693 | { |
c345cf9d | 694 | char *time_string; |
b5e300c2 | 695 | char hostname[MAXHOSTNAMELEN]; |
c345cf9d | 696 | socklen_t fromlen; |
697 | struct sockaddr_storage from; | |
c345cf9d | 698 | time_t last_login_time; |
699 | struct passwd * pw = s->pw; | |
700 | pid_t pid = getpid(); | |
701 | ||
702 | /* | |
703 | * Get IP address of client. If the connection is not a socket, let | |
704 | * the address be 0.0.0.0. | |
705 | */ | |
706 | memset(&from, 0, sizeof(from)); | |
707 | if (packet_connection_is_on_socket()) { | |
708 | fromlen = sizeof(from); | |
709 | if (getpeername(packet_get_connection_in(), | |
710 | (struct sockaddr *) & from, &fromlen) < 0) { | |
711 | debug("getpeername: %.100s", strerror(errno)); | |
712 | fatal_cleanup(); | |
713 | } | |
714 | } | |
715 | ||
bcbf86ec | 716 | /* Get the time and hostname when the user last logged in. */ |
4f4648f9 | 717 | if (options.print_lastlog) { |
718 | hostname[0] = '\0'; | |
719 | last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name, | |
720 | hostname, sizeof(hostname)); | |
721 | } | |
bcbf86ec | 722 | |
c345cf9d | 723 | /* Record that there was a login on that tty from the remote host. */ |
724 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
46e3af7f | 725 | get_remote_name_or_ip(utmp_len, options.reverse_mapping_check), |
726 | (struct sockaddr *)&from); | |
c345cf9d | 727 | |
2919e060 | 728 | #ifdef USE_PAM |
729 | /* | |
730 | * If password change is needed, do it now. | |
731 | * This needs to occur before the ~/.hushlogin check. | |
732 | */ | |
e11aab29 | 733 | if (is_pam_password_change_required()) { |
2919e060 | 734 | print_pam_messages(); |
735 | do_pam_chauthtok(); | |
736 | } | |
737 | #endif | |
738 | ||
f2c2fd71 | 739 | if (check_quietlogin(s, command)) |
c345cf9d | 740 | return; |
741 | ||
742 | #ifdef USE_PAM | |
e11aab29 | 743 | if (!is_pam_password_change_required()) |
2919e060 | 744 | print_pam_messages(); |
c345cf9d | 745 | #endif /* USE_PAM */ |
746 | #ifdef WITH_AIXAUTHENTICATE | |
747 | if (aixloginmsg && *aixloginmsg) | |
748 | printf("%s\n", aixloginmsg); | |
749 | #endif /* WITH_AIXAUTHENTICATE */ | |
750 | ||
4f4648f9 | 751 | if (options.print_lastlog && last_login_time != 0) { |
c345cf9d | 752 | time_string = ctime(&last_login_time); |
753 | if (strchr(time_string, '\n')) | |
754 | *strchr(time_string, '\n') = 0; | |
f478712e | 755 | if (strcmp(hostname, "") == 0) |
c345cf9d | 756 | printf("Last login: %s\r\n", time_string); |
757 | else | |
bcbf86ec | 758 | printf("Last login: %s from %s\r\n", time_string, hostname); |
c345cf9d | 759 | } |
f2c2fd71 | 760 | |
761 | do_motd(); | |
762 | } | |
763 | ||
764 | /* | |
765 | * Display the message of the day. | |
766 | */ | |
767 | void | |
768 | do_motd(void) | |
769 | { | |
770 | FILE *f; | |
771 | char buf[256]; | |
772 | ||
c345cf9d | 773 | if (options.print_motd) { |
2e73a022 | 774 | #ifdef HAVE_LOGIN_CAP |
775 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
776 | "/etc/motd"), "r"); | |
777 | #else | |
c345cf9d | 778 | f = fopen("/etc/motd", "r"); |
2e73a022 | 779 | #endif |
c345cf9d | 780 | if (f) { |
781 | while (fgets(buf, sizeof(buf), f)) | |
782 | fputs(buf, stdout); | |
783 | fclose(f); | |
784 | } | |
785 | } | |
786 | } | |
787 | ||
f2c2fd71 | 788 | |
789 | /* | |
790 | * Check for quiet login, either .hushlogin or command given. | |
791 | */ | |
792 | int | |
793 | check_quietlogin(Session *s, const char *command) | |
794 | { | |
795 | char buf[256]; | |
796 | struct passwd * pw = s->pw; | |
797 | struct stat st; | |
798 | ||
799 | /* Return 1 if .hushlogin exists or a command given. */ | |
800 | if (command != NULL) | |
801 | return 1; | |
802 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
803 | #ifdef HAVE_LOGIN_CAP | |
804 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
805 | return 1; | |
806 | #else | |
807 | if (stat(buf, &st) >= 0) | |
808 | return 1; | |
809 | #endif | |
810 | return 0; | |
811 | } | |
812 | ||
7368a6c8 | 813 | /* |
814 | * Sets the value of the given variable in the environment. If the variable | |
815 | * already exists, its value is overriden. | |
816 | */ | |
6ae2364d | 817 | void |
1e3b8b07 | 818 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
7368a6c8 | 819 | const char *value) |
820 | { | |
1e3b8b07 | 821 | u_int i, namelen; |
7368a6c8 | 822 | char **env; |
823 | ||
824 | /* | |
825 | * Find the slot where the value should be stored. If the variable | |
826 | * already exists, we reuse the slot; otherwise we append a new slot | |
827 | * at the end of the array, expanding if necessary. | |
828 | */ | |
829 | env = *envp; | |
830 | namelen = strlen(name); | |
831 | for (i = 0; env[i]; i++) | |
832 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
833 | break; | |
834 | if (env[i]) { | |
835 | /* Reuse the slot. */ | |
836 | xfree(env[i]); | |
837 | } else { | |
838 | /* New variable. Expand if necessary. */ | |
839 | if (i >= (*envsizep) - 1) { | |
840 | (*envsizep) += 50; | |
841 | env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); | |
842 | } | |
843 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
844 | env[i + 1] = NULL; | |
845 | } | |
846 | ||
847 | /* Allocate space and format the variable in the appropriate slot. */ | |
848 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
849 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
850 | } | |
851 | ||
852 | /* | |
853 | * Reads environment variables from the given file and adds/overrides them | |
854 | * into the environment. If the file does not exist, this does nothing. | |
855 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
856 | * and assignments of the form name=value. No other forms are allowed. | |
857 | */ | |
6ae2364d | 858 | void |
1e3b8b07 | 859 | read_environment_file(char ***env, u_int *envsize, |
7368a6c8 | 860 | const char *filename) |
861 | { | |
862 | FILE *f; | |
863 | char buf[4096]; | |
864 | char *cp, *value; | |
865 | ||
866 | f = fopen(filename, "r"); | |
867 | if (!f) | |
868 | return; | |
869 | ||
870 | while (fgets(buf, sizeof(buf), f)) { | |
871 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) | |
872 | ; | |
873 | if (!*cp || *cp == '#' || *cp == '\n') | |
874 | continue; | |
875 | if (strchr(cp, '\n')) | |
876 | *strchr(cp, '\n') = '\0'; | |
877 | value = strchr(cp, '='); | |
878 | if (value == NULL) { | |
879 | fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf); | |
880 | continue; | |
881 | } | |
71276795 | 882 | /* |
883 | * Replace the equals sign by nul, and advance value to | |
884 | * the value string. | |
885 | */ | |
7368a6c8 | 886 | *value = '\0'; |
887 | value++; | |
888 | child_set_env(env, envsize, cp, value); | |
889 | } | |
890 | fclose(f); | |
891 | } | |
892 | ||
893 | #ifdef USE_PAM | |
894 | /* | |
895 | * Sets any environment variables which have been specified by PAM | |
896 | */ | |
897 | void do_pam_environment(char ***env, int *envsize) | |
898 | { | |
899 | char *equals, var_name[512], var_val[512]; | |
900 | char **pam_env; | |
901 | int i; | |
902 | ||
903 | if ((pam_env = fetch_pam_environment()) == NULL) | |
904 | return; | |
2b87da3b | 905 | |
7368a6c8 | 906 | for(i = 0; pam_env[i] != NULL; i++) { |
907 | if ((equals = strstr(pam_env[i], "=")) == NULL) | |
908 | continue; | |
2b87da3b | 909 | |
7368a6c8 | 910 | if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) { |
911 | memset(var_name, '\0', sizeof(var_name)); | |
912 | memset(var_val, '\0', sizeof(var_val)); | |
913 | ||
914 | strncpy(var_name, pam_env[i], equals - pam_env[i]); | |
915 | strcpy(var_val, equals + 1); | |
916 | ||
22d89d24 | 917 | debug3("PAM environment: %s=%s", var_name, var_val); |
7368a6c8 | 918 | |
919 | child_set_env(env, envsize, var_name, var_val); | |
920 | } | |
921 | } | |
922 | } | |
923 | #endif /* USE_PAM */ | |
924 | ||
22d89d24 | 925 | #ifdef HAVE_CYGWIN |
926 | void copy_environment(char ***env, int *envsize) | |
927 | { | |
928 | char *equals, var_name[512], var_val[512]; | |
929 | int i; | |
930 | ||
931 | for(i = 0; environ[i] != NULL; i++) { | |
932 | if ((equals = strstr(environ[i], "=")) == NULL) | |
933 | continue; | |
2b87da3b | 934 | |
22d89d24 | 935 | if (strlen(environ[i]) < (sizeof(var_name) - 1)) { |
936 | memset(var_name, '\0', sizeof(var_name)); | |
937 | memset(var_val, '\0', sizeof(var_val)); | |
938 | ||
939 | strncpy(var_name, environ[i], equals - environ[i]); | |
940 | strcpy(var_val, equals + 1); | |
941 | ||
942 | debug3("Copy environment: %s=%s", var_name, var_val); | |
943 | ||
944 | child_set_env(env, envsize, var_name, var_val); | |
945 | } | |
946 | } | |
947 | } | |
948 | #endif | |
949 | ||
5fa45897 | 950 | #if defined(HAVE_GETUSERATTR) |
951 | /* | |
952 | * AIX-specific login initialisation | |
953 | */ | |
954 | void set_limit(char *user, char *soft, char *hard, int resource, int mult) | |
955 | { | |
956 | struct rlimit rlim; | |
56118702 | 957 | int slim, hlim; |
5fa45897 | 958 | |
959 | getrlimit(resource, &rlim); | |
960 | ||
56118702 | 961 | slim = 0; |
962 | if (getuserattr(user, soft, &slim, SEC_INT) != -1) { | |
963 | if (slim < 0) { | |
964 | rlim.rlim_cur = RLIM_INFINITY; | |
965 | } else if (slim != 0) { | |
966 | /* See the wackiness below */ | |
967 | if (rlim.rlim_cur == slim * mult) | |
968 | slim = 0; | |
969 | else | |
970 | rlim.rlim_cur = slim * mult; | |
971 | } | |
972 | } | |
5fa45897 | 973 | |
56118702 | 974 | hlim = 0; |
975 | if (getuserattr(user, hard, &hlim, SEC_INT) != -1) { | |
976 | if (hlim < 0) { | |
977 | rlim.rlim_max = RLIM_INFINITY; | |
978 | } else if (hlim != 0) { | |
979 | rlim.rlim_max = hlim * mult; | |
980 | } | |
981 | } | |
5fa45897 | 982 | |
56118702 | 983 | /* |
984 | * XXX For cpu and fsize the soft limit is set to the hard limit | |
985 | * if the hard limit is left at its default value and the soft limit | |
986 | * is changed from its default value, either by requesting it | |
987 | * (slim == 0) or by setting it to the current default. At least | |
988 | * that's how rlogind does it. If you're confused you're not alone. | |
989 | * Bug or feature? AIX 4.3.1.2 | |
990 | */ | |
991 | if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu")) | |
992 | && hlim == 0 && slim != 0) | |
993 | rlim.rlim_max = rlim.rlim_cur; | |
994 | /* A specified hard limit limits the soft limit */ | |
995 | else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max) | |
996 | rlim.rlim_cur = rlim.rlim_max; | |
997 | /* A soft limit can increase a hard limit */ | |
998 | else if (rlim.rlim_cur > rlim.rlim_max) | |
5fa45897 | 999 | rlim.rlim_max = rlim.rlim_cur; |
1000 | ||
1001 | if (setrlimit(resource, &rlim) != 0) | |
56118702 | 1002 | error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno)); |
5fa45897 | 1003 | } |
1004 | ||
1005 | void set_limits_from_userattr(char *user) | |
1006 | { | |
1007 | int mask; | |
1008 | char buf[16]; | |
1009 | ||
1010 | set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512); | |
1011 | set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1); | |
1012 | set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512); | |
1013 | set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512); | |
1014 | set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512); | |
1015 | set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512); | |
1016 | #if defined(S_UNOFILE) | |
1017 | set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1); | |
1018 | #endif | |
1019 | ||
1020 | if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) { | |
1021 | /* Convert decimal to octal */ | |
1022 | (void) snprintf(buf, sizeof(buf), "%d", mask); | |
1023 | if (sscanf(buf, "%o", &mask) == 1) | |
1024 | umask(mask); | |
1025 | } | |
1026 | } | |
1027 | #endif /* defined(HAVE_GETUSERATTR) */ | |
1028 | ||
7368a6c8 | 1029 | /* |
1030 | * Performs common processing for the child, such as setting up the | |
1031 | * environment, closing extra file descriptors, setting the user and group | |
1032 | * ids, and executing the command or shell. | |
1033 | */ | |
6ae2364d | 1034 | void |
56b3e9ce | 1035 | do_child(Session *s, const char *command) |
7368a6c8 | 1036 | { |
b5e300c2 | 1037 | const char *shell, *hostname = NULL, *cp = NULL; |
56b3e9ce | 1038 | struct passwd * pw = s->pw; |
7368a6c8 | 1039 | char buf[256]; |
6fc1e9f3 | 1040 | char cmd[1024]; |
2e73a022 | 1041 | FILE *f = NULL; |
1e3b8b07 | 1042 | u_int envsize, i; |
7368a6c8 | 1043 | char **env; |
1044 | extern char **environ; | |
1045 | struct stat st; | |
1046 | char *argv[10]; | |
56b3e9ce | 1047 | int do_xauth = s->auth_proto != NULL && s->auth_data != NULL; |
3206bb3b | 1048 | #ifdef WITH_IRIX_PROJECT |
1049 | prid_t projid; | |
1050 | #endif /* WITH_IRIX_PROJECT */ | |
d287c664 | 1051 | #ifdef WITH_IRIX_JOBS |
1052 | jid_t jid = 0; | |
1053 | #else | |
1054 | #ifdef WITH_IRIX_ARRAY | |
1055 | int jid = 0; | |
1056 | #endif /* WITH_IRIX_ARRAY */ | |
1057 | #endif /* WITH_IRIX_JOBS */ | |
1058 | ||
e78e738a | 1059 | /* remove hostkey from the child's memory */ |
1060 | destroy_sensitive_data(); | |
1061 | ||
fa649821 | 1062 | /* login(1) is only called if we execute the login shell */ |
1063 | if (options.use_login && command != NULL) | |
1064 | options.use_login = 0; | |
1065 | ||
c96a4aaf | 1066 | #if !defined(USE_PAM) && !defined(HAVE_OSF_SIA) |
2e73a022 | 1067 | if (!options.use_login) { |
1068 | # ifdef HAVE_LOGIN_CAP | |
1069 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1070 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1071 | _PATH_NOLOGIN), "r"); | |
1072 | # else /* HAVE_LOGIN_CAP */ | |
1073 | if (pw->pw_uid) | |
1074 | f = fopen(_PATH_NOLOGIN, "r"); | |
1075 | # endif /* HAVE_LOGIN_CAP */ | |
1076 | if (f) { | |
1077 | /* /etc/nologin exists. Print its contents and exit. */ | |
1078 | while (fgets(buf, sizeof(buf), f)) | |
1079 | fputs(buf, stderr); | |
1080 | fclose(f); | |
7368a6c8 | 1081 | exit(254); |
2e73a022 | 1082 | } |
7368a6c8 | 1083 | } |
c96a4aaf | 1084 | #endif /* USE_PAM || HAVE_OSF_SIA */ |
7368a6c8 | 1085 | |
2e73a022 | 1086 | /* Set login name, uid, gid, and groups. */ |
7368a6c8 | 1087 | /* Login(1) does this as well, and it needs uid 0 for the "-h" |
1088 | switch, so we let login(1) to this for us. */ | |
1089 | if (!options.use_login) { | |
4d33e531 | 1090 | #ifdef HAVE_OSF_SIA |
7a7101ec | 1091 | session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty); |
c96a4aaf | 1092 | if (!check_quietlogin(s, command)) |
1093 | do_motd(); | |
815800e1 | 1094 | #else /* HAVE_OSF_SIA */ |
3c62e7eb | 1095 | #ifdef HAVE_CYGWIN |
1096 | if (is_winnt) { | |
1097 | #else | |
7368a6c8 | 1098 | if (getuid() == 0 || geteuid() == 0) { |
3c62e7eb | 1099 | #endif |
2e73a022 | 1100 | # ifdef HAVE_GETUSERATTR |
5fa45897 | 1101 | set_limits_from_userattr(pw->pw_name); |
2e73a022 | 1102 | # endif /* HAVE_GETUSERATTR */ |
1103 | # ifdef HAVE_LOGIN_CAP | |
1104 | if (setusercontext(lc, pw, pw->pw_uid, | |
1105 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1106 | perror("unable to set user context"); | |
1107 | exit(1); | |
1108 | } | |
1109 | # else /* HAVE_LOGIN_CAP */ | |
73d6d7fa | 1110 | #if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) |
1111 | /* Sets login uid for accounting */ | |
1112 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1113 | error("setluid: %s", strerror(errno)); | |
1114 | #endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1115 | ||
2e73a022 | 1116 | if (setlogin(pw->pw_name) < 0) |
1117 | error("setlogin failed: %s", strerror(errno)); | |
7368a6c8 | 1118 | if (setgid(pw->pw_gid) < 0) { |
1119 | perror("setgid"); | |
1120 | exit(1); | |
1121 | } | |
1122 | /* Initialize the group list. */ | |
1123 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1124 | perror("initgroups"); | |
1125 | exit(1); | |
1126 | } | |
1127 | endgrent(); | |
9afbfcfa | 1128 | # ifdef USE_PAM |
1129 | /* | |
1130 | * PAM credentials may take the form of | |
1131 | * supplementary groups. These will have been | |
1132 | * wiped by the above initgroups() call. | |
1133 | * Reestablish them here. | |
1134 | */ | |
1135 | do_pam_setcred(0); | |
1136 | # endif /* USE_PAM */ | |
d287c664 | 1137 | # ifdef WITH_IRIX_JOBS |
1138 | jid = jlimit_startjob(pw->pw_name, pw->pw_uid, "interactive"); | |
1139 | if (jid == -1) { | |
1140 | fatal("Failed to create job container: %.100s", | |
1141 | strerror(errno)); | |
2b87da3b | 1142 | } |
d287c664 | 1143 | # endif /* WITH_IRIX_JOBS */ |
2e73a022 | 1144 | # ifdef WITH_IRIX_ARRAY |
3206bb3b | 1145 | /* initialize array session */ |
d287c664 | 1146 | if (jid == 0) { |
1147 | if (newarraysess() != 0) | |
1148 | fatal("Failed to set up new array session: %.100s", | |
1149 | strerror(errno)); | |
1150 | } | |
2e73a022 | 1151 | # endif /* WITH_IRIX_ARRAY */ |
1152 | # ifdef WITH_IRIX_PROJECT | |
3206bb3b | 1153 | /* initialize irix project info */ |
1154 | if ((projid = getdfltprojuser(pw->pw_name)) == -1) { | |
1155 | debug("Failed to get project id, using projid 0"); | |
1156 | projid = 0; | |
1157 | } | |
3206bb3b | 1158 | if (setprid(projid)) |
1159 | fatal("Failed to initialize project %d for %s: %.100s", | |
1160 | (int)projid, pw->pw_name, strerror(errno)); | |
2e73a022 | 1161 | # endif /* WITH_IRIX_PROJECT */ |
260d427b | 1162 | #ifdef WITH_IRIX_AUDIT |
1163 | if (sysconf(_SC_AUDIT)) { | |
1164 | debug("Setting sat id to %d", (int) pw->pw_uid); | |
1165 | if (satsetid(pw->pw_uid)) | |
1166 | debug("error setting satid: %.100s", strerror(errno)); | |
1167 | } | |
1168 | #endif /* WITH_IRIX_AUDIT */ | |
1169 | ||
8a968c25 | 1170 | #ifdef _AIX |
1171 | /* | |
1172 | * AIX has a "usrinfo" area where logname and | |
1173 | * other stuff is stored - a few applications | |
1174 | * actually use this and die if it's not set | |
1175 | */ | |
ee110bfb | 1176 | if (s->ttyfd == -1) |
1177 | s->tty[0] = '\0'; | |
f5f6020e | 1178 | cp = xmalloc(22 + strlen(s->tty) + |
8a968c25 | 1179 | 2 * strlen(pw->pw_name)); |
1180 | i = sprintf(cp, "LOGNAME=%s%cNAME=%s%cTTY=%s%c%c", | |
ee110bfb | 1181 | pw->pw_name, 0, pw->pw_name, 0, s->tty, 0, 0); |
8a968c25 | 1182 | if (usrinfo(SETUINFO, cp, i) == -1) |
1183 | fatal("Couldn't set usrinfo: %s", | |
1184 | strerror(errno)); | |
1185 | debug3("AIX/UsrInfo: set len %d", i); | |
1186 | xfree(cp); | |
1187 | #endif | |
1188 | ||
7368a6c8 | 1189 | /* Permanently switch to the desired uid. */ |
63bd8c36 | 1190 | permanently_set_uid(pw); |
2e73a022 | 1191 | # endif /* HAVE_LOGIN_CAP */ |
7368a6c8 | 1192 | } |
2e73a022 | 1193 | #endif /* HAVE_OSF_SIA */ |
1194 | ||
3c62e7eb | 1195 | #ifdef HAVE_CYGWIN |
1196 | if (is_winnt) | |
1197 | #endif | |
7368a6c8 | 1198 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
14a9a859 | 1199 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); |
7368a6c8 | 1200 | } |
1201 | /* | |
1202 | * Get the shell from the password data. An empty shell field is | |
1203 | * legal, and means /bin/sh. | |
1204 | */ | |
1205 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
2e73a022 | 1206 | #ifdef HAVE_LOGIN_CAP |
1207 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1208 | #endif | |
7368a6c8 | 1209 | |
1210 | #ifdef AFS | |
1211 | /* Try to get AFS tokens for the local cell. */ | |
1212 | if (k_hasafs()) { | |
1213 | char cell[64]; | |
1214 | ||
1215 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1216 | krb_afslog(cell, 0); | |
1217 | ||
1218 | krb_afslog(0, 0); | |
1219 | } | |
1220 | #endif /* AFS */ | |
1221 | ||
1222 | /* Initialize the environment. */ | |
1223 | envsize = 100; | |
1224 | env = xmalloc(envsize * sizeof(char *)); | |
1225 | env[0] = NULL; | |
1226 | ||
3c62e7eb | 1227 | #ifdef HAVE_CYGWIN |
1228 | /* | |
1229 | * The Windows environment contains some setting which are | |
1230 | * important for a running system. They must not be dropped. | |
1231 | */ | |
22d89d24 | 1232 | copy_environment(&env, &envsize); |
3c62e7eb | 1233 | #endif |
1234 | ||
7368a6c8 | 1235 | if (!options.use_login) { |
1236 | /* Set basic environment. */ | |
1237 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
1238 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
1239 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); | |
2e73a022 | 1240 | #ifdef HAVE_LOGIN_CAP |
1241 | (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH); | |
1242 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1243 | #else /* HAVE_LOGIN_CAP */ |
1244 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1245 | /* |
1246 | * There's no standard path on Windows. The path contains | |
1247 | * important components pointing to the system directories, | |
1248 | * needed for loading shared libraries. So the path better | |
1249 | * remains intact here. | |
1250 | */ | |
7368a6c8 | 1251 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
22d89d24 | 1252 | # endif /* HAVE_CYGWIN */ |
1253 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1254 | |
1255 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1256 | _PATH_MAILDIR, pw->pw_name); | |
1257 | child_set_env(&env, &envsize, "MAIL", buf); | |
1258 | ||
1259 | /* Normal systems set SHELL by default. */ | |
1260 | child_set_env(&env, &envsize, "SHELL", shell); | |
1261 | } | |
1262 | if (getenv("TZ")) | |
1263 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1264 | ||
1265 | /* Set custom environment options from RSA authentication. */ | |
1266 | while (custom_environment) { | |
1267 | struct envstring *ce = custom_environment; | |
1268 | char *s = ce->s; | |
1269 | int i; | |
1270 | for (i = 0; s[i] != '=' && s[i]; i++); | |
1271 | if (s[i] == '=') { | |
1272 | s[i] = 0; | |
1273 | child_set_env(&env, &envsize, s, s + i + 1); | |
1274 | } | |
1275 | custom_environment = ce->next; | |
1276 | xfree(ce->s); | |
1277 | xfree(ce); | |
1278 | } | |
1279 | ||
1280 | snprintf(buf, sizeof buf, "%.50s %d %d", | |
1281 | get_remote_ipaddr(), get_remote_port(), get_local_port()); | |
1282 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); | |
1283 | ||
56b3e9ce | 1284 | if (s->ttyfd != -1) |
1285 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1286 | if (s->term) | |
1287 | child_set_env(&env, &envsize, "TERM", s->term); | |
1288 | if (s->display) | |
1289 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 1290 | if (original_command) |
1291 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1292 | original_command); | |
7368a6c8 | 1293 | |
1294 | #ifdef _AIX | |
22d89d24 | 1295 | if ((cp = getenv("AUTHSTATE")) != NULL) |
1296 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1297 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1298 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1299 | read_environment_file(&env, &envsize, "/etc/environment"); | |
7368a6c8 | 1300 | #endif |
1301 | ||
1302 | #ifdef KRB4 | |
1303 | { | |
1304 | extern char *ticket; | |
1305 | ||
1306 | if (ticket) | |
1307 | child_set_env(&env, &envsize, "KRBTKFILE", ticket); | |
1308 | } | |
1309 | #endif /* KRB4 */ | |
1310 | ||
1311 | #ifdef USE_PAM | |
1312 | /* Pull in any environment variables that may have been set by PAM. */ | |
1313 | do_pam_environment(&env, &envsize); | |
1314 | #endif /* USE_PAM */ | |
1315 | ||
7368a6c8 | 1316 | if (xauthfile) |
1317 | child_set_env(&env, &envsize, "XAUTHORITY", xauthfile); | |
1318 | if (auth_get_socket_name() != NULL) | |
1319 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, | |
1320 | auth_get_socket_name()); | |
1321 | ||
1322 | /* read $HOME/.ssh/environment. */ | |
1323 | if (!options.use_login) { | |
71276795 | 1324 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
1325 | pw->pw_dir); | |
7368a6c8 | 1326 | read_environment_file(&env, &envsize, buf); |
1327 | } | |
1328 | if (debug_flag) { | |
1329 | /* dump the environment */ | |
1330 | fprintf(stderr, "Environment:\n"); | |
1331 | for (i = 0; env[i]; i++) | |
1332 | fprintf(stderr, " %.200s\n", env[i]); | |
1333 | } | |
2e73a022 | 1334 | /* we have to stash the hostname before we close our socket. */ |
1335 | if (options.use_login) | |
46e3af7f | 1336 | hostname = get_remote_name_or_ip(utmp_len, |
1337 | options.reverse_mapping_check); | |
7368a6c8 | 1338 | /* |
1339 | * Close the connection descriptors; note that this is the child, and | |
1340 | * the server will still have the socket open, and it is important | |
1341 | * that we do not shutdown it. Note that the descriptors cannot be | |
1342 | * closed before building the environment, as we call | |
1343 | * get_remote_ipaddr there. | |
1344 | */ | |
1345 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1346 | close(packet_get_connection_in()); | |
1347 | else { | |
1348 | close(packet_get_connection_in()); | |
1349 | close(packet_get_connection_out()); | |
1350 | } | |
1351 | /* | |
1352 | * Close all descriptors related to channels. They will still remain | |
1353 | * open in the parent. | |
1354 | */ | |
1355 | /* XXX better use close-on-exec? -markus */ | |
1356 | channel_close_all(); | |
1357 | ||
1358 | /* | |
1359 | * Close any extra file descriptors. Note that there may still be | |
1360 | * descriptors left by system functions. They will be closed later. | |
1361 | */ | |
1362 | endpwent(); | |
1363 | ||
1364 | /* | |
1365 | * Close any extra open file descriptors so that we don\'t have them | |
1366 | * hanging around in clients. Note that we want to do this after | |
1367 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1368 | * descriptors open. | |
1369 | */ | |
1370 | for (i = 3; i < 64; i++) | |
1371 | close(i); | |
1372 | ||
1373 | /* Change current directory to the user\'s home directory. */ | |
2e73a022 | 1374 | if (chdir(pw->pw_dir) < 0) { |
7368a6c8 | 1375 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", |
1376 | pw->pw_dir, strerror(errno)); | |
2e73a022 | 1377 | #ifdef HAVE_LOGIN_CAP |
1378 | if (login_getcapbool(lc, "requirehome", 0)) | |
1379 | exit(1); | |
1380 | #endif | |
1381 | } | |
7368a6c8 | 1382 | |
1383 | /* | |
1384 | * Must take new environment into use so that .ssh/rc, /etc/sshrc and | |
1385 | * xauth are run in the proper environment. | |
1386 | */ | |
1387 | environ = env; | |
1388 | ||
1389 | /* | |
1390 | * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first | |
1391 | * in this order). | |
1392 | */ | |
1393 | if (!options.use_login) { | |
e78e738a | 1394 | /* ignore _PATH_SSH_USER_RC for subsystems */ |
1395 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
503e7e5b | 1396 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", |
1397 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
7368a6c8 | 1398 | if (debug_flag) |
503e7e5b | 1399 | fprintf(stderr, "Running %s\n", cmd); |
1400 | f = popen(cmd, "w"); | |
7368a6c8 | 1401 | if (f) { |
56b3e9ce | 1402 | if (do_xauth) |
1403 | fprintf(f, "%s %s\n", s->auth_proto, | |
1404 | s->auth_data); | |
7368a6c8 | 1405 | pclose(f); |
1406 | } else | |
96c63318 | 1407 | fprintf(stderr, "Could not run %s\n", |
56b3e9ce | 1408 | _PATH_SSH_USER_RC); |
42f11eb2 | 1409 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { |
7368a6c8 | 1410 | if (debug_flag) |
56b3e9ce | 1411 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, |
1412 | _PATH_SSH_SYSTEM_RC); | |
42f11eb2 | 1413 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); |
7368a6c8 | 1414 | if (f) { |
56b3e9ce | 1415 | if (do_xauth) |
1416 | fprintf(f, "%s %s\n", s->auth_proto, | |
1417 | s->auth_data); | |
7368a6c8 | 1418 | pclose(f); |
1419 | } else | |
56b3e9ce | 1420 | fprintf(stderr, "Could not run %s\n", |
1421 | _PATH_SSH_SYSTEM_RC); | |
1422 | } else if (do_xauth && options.xauth_location != NULL) { | |
7368a6c8 | 1423 | /* Add authority data to .Xauthority if appropriate. */ |
56b3e9ce | 1424 | char *screen = strchr(s->display, ':'); |
1425 | ||
1426 | if (debug_flag) { | |
1427 | fprintf(stderr, | |
1428 | "Running %.100s add " | |
1429 | "%.100s %.100s %.100s\n", | |
1430 | options.xauth_location, s->display, | |
1431 | s->auth_proto, s->auth_data); | |
1432 | if (screen != NULL) | |
71276795 | 1433 | fprintf(stderr, |
56b3e9ce | 1434 | "Adding %.*s/unix%s %s %s\n", |
1435 | (int)(screen - s->display), | |
1436 | s->display, screen, | |
1437 | s->auth_proto, s->auth_data); | |
1438 | } | |
1439 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1440 | options.xauth_location); | |
1441 | f = popen(cmd, "w"); | |
1442 | if (f) { | |
1443 | fprintf(f, "add %s %s %s\n", s->display, | |
1444 | s->auth_proto, s->auth_data); | |
1445 | if (screen != NULL) | |
1446 | fprintf(f, "add %.*s/unix%s %s %s\n", | |
1447 | (int)(screen - s->display), | |
1448 | s->display, screen, | |
1449 | s->auth_proto, | |
1450 | s->auth_data); | |
1451 | pclose(f); | |
1452 | } else { | |
1453 | fprintf(stderr, "Could not run %s\n", | |
1454 | cmd); | |
7368a6c8 | 1455 | } |
1456 | } | |
7368a6c8 | 1457 | /* Get the last component of the shell name. */ |
1458 | cp = strrchr(shell, '/'); | |
1459 | if (cp) | |
1460 | cp++; | |
1461 | else | |
1462 | cp = shell; | |
1463 | } | |
1d3c30db | 1464 | |
1465 | /* restore SIGPIPE for child */ | |
1466 | signal(SIGPIPE, SIG_DFL); | |
1467 | ||
7368a6c8 | 1468 | /* |
1469 | * If we have no command, execute the shell. In this case, the shell | |
1470 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1471 | * this is a login shell. | |
1472 | */ | |
1473 | if (!command) { | |
1474 | if (!options.use_login) { | |
1475 | char buf[256]; | |
1476 | ||
1477 | /* | |
1478 | * Check for mail if we have a tty and it was enabled | |
1479 | * in server options. | |
1480 | */ | |
56b3e9ce | 1481 | if (s->ttyfd != -1 && options.check_mail) { |
7368a6c8 | 1482 | char *mailbox; |
1483 | struct stat mailstat; | |
56b3e9ce | 1484 | |
7368a6c8 | 1485 | mailbox = getenv("MAIL"); |
1486 | if (mailbox != NULL) { | |
71276795 | 1487 | if (stat(mailbox, &mailstat) != 0 || |
1488 | mailstat.st_size == 0) | |
7368a6c8 | 1489 | printf("No mail.\n"); |
1490 | else if (mailstat.st_mtime < mailstat.st_atime) | |
1491 | printf("You have mail.\n"); | |
1492 | else | |
1493 | printf("You have new mail.\n"); | |
1494 | } | |
1495 | } | |
1496 | /* Start the shell. Set initial character to '-'. */ | |
1497 | buf[0] = '-'; | |
1498 | strncpy(buf + 1, cp, sizeof(buf) - 1); | |
1499 | buf[sizeof(buf) - 1] = 0; | |
1500 | ||
1501 | /* Execute the shell. */ | |
1502 | argv[0] = buf; | |
1503 | argv[1] = NULL; | |
1504 | execve(shell, argv, env); | |
1505 | ||
1506 | /* Executing the shell failed. */ | |
1507 | perror(shell); | |
1508 | exit(1); | |
1509 | ||
1510 | } else { | |
1511 | /* Launch login(1). */ | |
1512 | ||
2e73a022 | 1513 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
c345cf9d | 1514 | "-p", "-f", "--", pw->pw_name, NULL); |
7368a6c8 | 1515 | |
1516 | /* Login couldn't be executed, die. */ | |
1517 | ||
1518 | perror("login"); | |
1519 | exit(1); | |
1520 | } | |
1521 | } | |
1522 | /* | |
1523 | * Execute the command using the user's shell. This uses the -c | |
1524 | * option to execute the command. | |
1525 | */ | |
1526 | argv[0] = (char *) cp; | |
1527 | argv[1] = "-c"; | |
1528 | argv[2] = (char *) command; | |
1529 | argv[3] = NULL; | |
1530 | execve(shell, argv, env); | |
1531 | perror(shell); | |
1532 | exit(1); | |
1533 | } | |
1534 | ||
1535 | Session * | |
1536 | session_new(void) | |
1537 | { | |
1538 | int i; | |
1539 | static int did_init = 0; | |
1540 | if (!did_init) { | |
1541 | debug("session_new: init"); | |
1542 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1543 | sessions[i].used = 0; | |
1544 | sessions[i].self = i; | |
1545 | } | |
1546 | did_init = 1; | |
1547 | } | |
1548 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1549 | Session *s = &sessions[i]; | |
1550 | if (! s->used) { | |
690d0d7f | 1551 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1552 | s->chanid = -1; |
1553 | s->ptyfd = -1; | |
1554 | s->ttyfd = -1; | |
7368a6c8 | 1555 | s->used = 1; |
02323c45 | 1556 | debug("session_new: session %d", i); |
7368a6c8 | 1557 | return s; |
1558 | } | |
1559 | } | |
1560 | return NULL; | |
1561 | } | |
1562 | ||
1563 | void | |
1564 | session_dump(void) | |
1565 | { | |
1566 | int i; | |
1567 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1568 | Session *s = &sessions[i]; | |
1569 | debug("dump: used %d session %d %p channel %d pid %d", | |
1570 | s->used, | |
1571 | s->self, | |
1572 | s, | |
1573 | s->chanid, | |
1574 | s->pid); | |
1575 | } | |
1576 | } | |
1577 | ||
e78a59f5 | 1578 | int |
1579 | session_open(int chanid) | |
1580 | { | |
1581 | Session *s = session_new(); | |
1582 | debug("session_open: channel %d", chanid); | |
1583 | if (s == NULL) { | |
1584 | error("no more sessions"); | |
1585 | return 0; | |
1586 | } | |
e78a59f5 | 1587 | s->pw = auth_get_user(); |
1588 | if (s->pw == NULL) | |
0725ea77 | 1589 | fatal("no user for session %d", s->self); |
0b242b12 | 1590 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1591 | s->chanid = chanid; | |
e78a59f5 | 1592 | return 1; |
1593 | } | |
1594 | ||
1595 | Session * | |
1596 | session_by_channel(int id) | |
1597 | { | |
1598 | int i; | |
1599 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1600 | Session *s = &sessions[i]; | |
1601 | if (s->used && s->chanid == id) { | |
1602 | debug("session_by_channel: session %d channel %d", i, id); | |
1603 | return s; | |
1604 | } | |
1605 | } | |
1606 | debug("session_by_channel: unknown channel %d", id); | |
1607 | session_dump(); | |
1608 | return NULL; | |
1609 | } | |
1610 | ||
1611 | Session * | |
1612 | session_by_pid(pid_t pid) | |
1613 | { | |
1614 | int i; | |
1615 | debug("session_by_pid: pid %d", pid); | |
1616 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1617 | Session *s = &sessions[i]; | |
1618 | if (s->used && s->pid == pid) | |
1619 | return s; | |
1620 | } | |
1621 | error("session_by_pid: unknown pid %d", pid); | |
1622 | session_dump(); | |
1623 | return NULL; | |
1624 | } | |
1625 | ||
1626 | int | |
1627 | session_window_change_req(Session *s) | |
1628 | { | |
1629 | s->col = packet_get_int(); | |
1630 | s->row = packet_get_int(); | |
1631 | s->xpixel = packet_get_int(); | |
1632 | s->ypixel = packet_get_int(); | |
6ae2364d | 1633 | packet_done(); |
e78a59f5 | 1634 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1635 | return 1; | |
1636 | } | |
1637 | ||
1638 | int | |
1639 | session_pty_req(Session *s) | |
1640 | { | |
1e3b8b07 | 1641 | u_int len; |
30dcc918 | 1642 | int n_bytes; |
e78a59f5 | 1643 | |
38c295d6 | 1644 | if (no_pty_flag) |
1645 | return 0; | |
e78a59f5 | 1646 | if (s->ttyfd != -1) |
6ae2364d | 1647 | return 0; |
e78a59f5 | 1648 | s->term = packet_get_string(&len); |
1649 | s->col = packet_get_int(); | |
1650 | s->row = packet_get_int(); | |
1651 | s->xpixel = packet_get_int(); | |
1652 | s->ypixel = packet_get_int(); | |
1653 | ||
1654 | if (strcmp(s->term, "") == 0) { | |
1655 | xfree(s->term); | |
1656 | s->term = NULL; | |
1657 | } | |
1658 | /* Allocate a pty and open it. */ | |
1659 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) { | |
1660 | xfree(s->term); | |
1661 | s->term = NULL; | |
1662 | s->ptyfd = -1; | |
1663 | s->ttyfd = -1; | |
1664 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1665 | return 0; |
e78a59f5 | 1666 | } |
1667 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1668 | /* | |
1669 | * Add a cleanup function to clear the utmp entry and record logout | |
1670 | * time in case we call fatal() (e.g., the connection gets closed). | |
1671 | */ | |
1672 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
1673 | pty_setowner(s->pw, s->tty); | |
1674 | /* Get window size from the packet. */ | |
1675 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1676 | ||
30dcc918 | 1677 | /* Get tty modes from the packet. */ |
1678 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1679 | packet_done(); | |
1680 | ||
1d1ffb87 | 1681 | session_proctitle(s); |
1682 | ||
e78a59f5 | 1683 | return 1; |
1684 | } | |
1685 | ||
0b242b12 | 1686 | int |
1687 | session_subsystem_req(Session *s) | |
1688 | { | |
1e3b8b07 | 1689 | u_int len; |
0b242b12 | 1690 | int success = 0; |
1691 | char *subsys = packet_get_string(&len); | |
38c295d6 | 1692 | int i; |
0b242b12 | 1693 | |
1694 | packet_done(); | |
1695 | log("subsystem request for %s", subsys); | |
1696 | ||
38c295d6 | 1697 | for (i = 0; i < options.num_subsystems; i++) { |
1698 | if(strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1699 | debug("subsystem: exec() %s", options.subsystem_command[i]); | |
e5d7a405 | 1700 | s->is_subsystem = 1; |
65068d16 | 1701 | do_exec_no_pty(s, options.subsystem_command[i]); |
38c295d6 | 1702 | success = 1; |
1703 | } | |
1704 | } | |
1705 | ||
1706 | if (!success) | |
1707 | log("subsystem request for %s failed, subsystem not found", subsys); | |
1708 | ||
0b242b12 | 1709 | xfree(subsys); |
1710 | return success; | |
1711 | } | |
1712 | ||
1713 | int | |
1714 | session_x11_req(Session *s) | |
1715 | { | |
b5e300c2 | 1716 | int fd; |
089fbbd2 | 1717 | if (no_x11_forwarding_flag) { |
38c295d6 | 1718 | debug("X11 forwarding disabled in user configuration file."); |
1719 | return 0; | |
1720 | } | |
0b242b12 | 1721 | if (!options.x11_forwarding) { |
1722 | debug("X11 forwarding disabled in server configuration file."); | |
1723 | return 0; | |
1724 | } | |
1725 | if (xauthfile != NULL) { | |
1726 | debug("X11 fwd already started."); | |
1727 | return 0; | |
1728 | } | |
1729 | ||
1730 | debug("Received request for X11 forwarding with auth spoofing."); | |
1731 | if (s->display != NULL) | |
1732 | packet_disconnect("Protocol error: X11 display already set."); | |
1733 | ||
1734 | s->single_connection = packet_get_char(); | |
1735 | s->auth_proto = packet_get_string(NULL); | |
1736 | s->auth_data = packet_get_string(NULL); | |
1737 | s->screen = packet_get_int(); | |
1738 | packet_done(); | |
1739 | ||
1740 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
1741 | if (s->display == NULL) { | |
1742 | xfree(s->auth_proto); | |
1743 | xfree(s->auth_data); | |
1744 | return 0; | |
1745 | } | |
1746 | xauthfile = xmalloc(MAXPATHLEN); | |
1747 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
63bd8c36 | 1748 | temporarily_use_uid(s->pw); |
0b242b12 | 1749 | if (mkdtemp(xauthfile) == NULL) { |
1750 | restore_uid(); | |
1751 | error("private X11 dir: mkdtemp %s failed: %s", | |
1752 | xauthfile, strerror(errno)); | |
1753 | xfree(xauthfile); | |
1754 | xauthfile = NULL; | |
1755 | xfree(s->auth_proto); | |
1756 | xfree(s->auth_data); | |
1757 | /* XXXX remove listening channels */ | |
1758 | return 0; | |
1759 | } | |
1760 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
b5e300c2 | 1761 | fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); |
1762 | if (fd >= 0) | |
1763 | close(fd); | |
0b242b12 | 1764 | restore_uid(); |
1765 | fatal_add_cleanup(xauthfile_cleanup_proc, s); | |
1766 | return 1; | |
1767 | } | |
1768 | ||
38c295d6 | 1769 | int |
1770 | session_shell_req(Session *s) | |
1771 | { | |
1772 | /* if forced_command == NULL, the shell is execed */ | |
1773 | char *shell = forced_command; | |
1774 | packet_done(); | |
38c295d6 | 1775 | if (s->ttyfd == -1) |
65068d16 | 1776 | do_exec_no_pty(s, shell); |
38c295d6 | 1777 | else |
65068d16 | 1778 | do_exec_pty(s, shell); |
38c295d6 | 1779 | return 1; |
1780 | } | |
1781 | ||
1782 | int | |
1783 | session_exec_req(Session *s) | |
1784 | { | |
1e3b8b07 | 1785 | u_int len; |
38c295d6 | 1786 | char *command = packet_get_string(&len); |
1787 | packet_done(); | |
1788 | if (forced_command) { | |
b5e300c2 | 1789 | original_command = command; |
38c295d6 | 1790 | command = forced_command; |
1791 | debug("Forced command '%.500s'", forced_command); | |
1792 | } | |
38c295d6 | 1793 | if (s->ttyfd == -1) |
65068d16 | 1794 | do_exec_no_pty(s, command); |
38c295d6 | 1795 | else |
65068d16 | 1796 | do_exec_pty(s, command); |
38c295d6 | 1797 | if (forced_command == NULL) |
1798 | xfree(command); | |
1799 | return 1; | |
1800 | } | |
1801 | ||
fa08c86b | 1802 | int |
1803 | session_auth_agent_req(Session *s) | |
1804 | { | |
1805 | static int called = 0; | |
1806 | packet_done(); | |
d343d900 | 1807 | if (no_agent_forwarding_flag) { |
1808 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1809 | return 0; | |
1810 | } | |
fa08c86b | 1811 | if (called) { |
1812 | return 0; | |
1813 | } else { | |
1814 | called = 1; | |
1815 | return auth_input_request_forwarding(s->pw); | |
1816 | } | |
1817 | } | |
1818 | ||
e78a59f5 | 1819 | void |
1820 | session_input_channel_req(int id, void *arg) | |
1821 | { | |
1e3b8b07 | 1822 | u_int len; |
e78a59f5 | 1823 | int reply; |
1824 | int success = 0; | |
1825 | char *rtype; | |
1826 | Session *s; | |
1827 | Channel *c; | |
1828 | ||
1829 | rtype = packet_get_string(&len); | |
1830 | reply = packet_get_char(); | |
1831 | ||
1832 | s = session_by_channel(id); | |
1833 | if (s == NULL) | |
1834 | fatal("session_input_channel_req: channel %d: no session", id); | |
1835 | c = channel_lookup(id); | |
1836 | if (c == NULL) | |
1837 | fatal("session_input_channel_req: channel %d: bad channel", id); | |
1838 | ||
1839 | debug("session_input_channel_req: session %d channel %d request %s reply %d", | |
1840 | s->self, id, rtype, reply); | |
1841 | ||
1842 | /* | |
e5d7a405 | 1843 | * a session is in LARVAL state until a shell, a command |
1844 | * or a subsystem is executed | |
e78a59f5 | 1845 | */ |
1846 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1847 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1848 | success = session_shell_req(s); |
e78a59f5 | 1849 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1850 | success = session_exec_req(s); |
e78a59f5 | 1851 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1852 | success = session_pty_req(s); |
0b242b12 | 1853 | } else if (strcmp(rtype, "x11-req") == 0) { |
1854 | success = session_x11_req(s); | |
fa08c86b | 1855 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
1856 | success = session_auth_agent_req(s); | |
0b242b12 | 1857 | } else if (strcmp(rtype, "subsystem") == 0) { |
1858 | success = session_subsystem_req(s); | |
e78a59f5 | 1859 | } |
1860 | } | |
1861 | if (strcmp(rtype, "window-change") == 0) { | |
1862 | success = session_window_change_req(s); | |
1863 | } | |
1864 | ||
1865 | if (reply) { | |
1866 | packet_start(success ? | |
1867 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1868 | packet_put_int(c->remote_id); | |
1869 | packet_send(); | |
1870 | } | |
1871 | xfree(rtype); | |
1872 | } | |
1873 | ||
1874 | void | |
1875 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1876 | { | |
1877 | if (!compat20) | |
1878 | fatal("session_set_fds: called for proto != 2.0"); | |
1879 | /* | |
1880 | * now that have a child and a pipe to the child, | |
1881 | * we can activate our channel and register the fd's | |
1882 | */ | |
1883 | if (s->chanid == -1) | |
1884 | fatal("no channel for session %d", s->self); | |
1885 | channel_set_fds(s->chanid, | |
1886 | fdout, fdin, fderr, | |
a22aff1f | 1887 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
1888 | 1); | |
e78a59f5 | 1889 | } |
1890 | ||
7368a6c8 | 1891 | void |
1892 | session_pty_cleanup(Session *s) | |
1893 | { | |
1894 | if (s == NULL || s->ttyfd == -1) | |
1895 | return; | |
1896 | ||
0725ea77 | 1897 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 1898 | |
1899 | /* Cancel the cleanup function. */ | |
1900 | fatal_remove_cleanup(pty_cleanup_proc, (void *)s); | |
1901 | ||
1902 | /* Record that the user has logged out. */ | |
1903 | record_logout(s->pid, s->tty); | |
1904 | ||
1905 | /* Release the pseudo-tty. */ | |
1906 | pty_release(s->tty); | |
1907 | ||
1908 | /* | |
1909 | * Close the server side of the socket pairs. We must do this after | |
1910 | * the pty cleanup, so that another process doesn't get this pty | |
1911 | * while we're still cleaning up. | |
1912 | */ | |
1913 | if (close(s->ptymaster) < 0) | |
1914 | error("close(s->ptymaster): %s", strerror(errno)); | |
1915 | } | |
e78a59f5 | 1916 | |
1917 | void | |
1918 | session_exit_message(Session *s, int status) | |
1919 | { | |
1920 | Channel *c; | |
1921 | if (s == NULL) | |
1922 | fatal("session_close: no session"); | |
1923 | c = channel_lookup(s->chanid); | |
1924 | if (c == NULL) | |
1925 | fatal("session_close: session %d: no channel %d", | |
1926 | s->self, s->chanid); | |
1927 | debug("session_exit_message: session %d channel %d pid %d", | |
1928 | s->self, s->chanid, s->pid); | |
1929 | ||
1930 | if (WIFEXITED(status)) { | |
1931 | channel_request_start(s->chanid, | |
1932 | "exit-status", 0); | |
1933 | packet_put_int(WEXITSTATUS(status)); | |
1934 | packet_send(); | |
1935 | } else if (WIFSIGNALED(status)) { | |
1936 | channel_request_start(s->chanid, | |
1937 | "exit-signal", 0); | |
1938 | packet_put_int(WTERMSIG(status)); | |
a64009ad | 1939 | #ifdef WCOREDUMP |
e78a59f5 | 1940 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1941 | #else /* WCOREDUMP */ |
1942 | packet_put_char(0); | |
1943 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1944 | packet_put_cstring(""); |
1945 | packet_put_cstring(""); | |
1946 | packet_send(); | |
1947 | } else { | |
1948 | /* Some weird exit cause. Just exit. */ | |
1949 | packet_disconnect("wait returned status %04x.", status); | |
1950 | } | |
1951 | ||
1952 | /* disconnect channel */ | |
1953 | debug("session_exit_message: release channel %d", s->chanid); | |
1954 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1955 | /* |
1956 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1957 | * interested in data we write. | |
1958 | * Note that we must not call 'chan_read_failed', since there could | |
1959 | * be some more data waiting in the pipe. | |
1960 | */ | |
0b242b12 | 1961 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1962 | chan_write_failed(c); | |
e78a59f5 | 1963 | s->chanid = -1; |
1964 | } | |
1965 | ||
1966 | void | |
1967 | session_free(Session *s) | |
1968 | { | |
1969 | debug("session_free: session %d pid %d", s->self, s->pid); | |
1970 | if (s->term) | |
1971 | xfree(s->term); | |
1972 | if (s->display) | |
1973 | xfree(s->display); | |
1974 | if (s->auth_data) | |
1975 | xfree(s->auth_data); | |
1976 | if (s->auth_proto) | |
1977 | xfree(s->auth_proto); | |
1978 | s->used = 0; | |
1979 | } | |
1980 | ||
1981 | void | |
1982 | session_close(Session *s) | |
1983 | { | |
1984 | session_pty_cleanup(s); | |
1985 | session_free(s); | |
1d1ffb87 | 1986 | session_proctitle(s); |
e78a59f5 | 1987 | } |
1988 | ||
1989 | void | |
1990 | session_close_by_pid(pid_t pid, int status) | |
1991 | { | |
1992 | Session *s = session_by_pid(pid); | |
1993 | if (s == NULL) { | |
1994 | debug("session_close_by_pid: no session for pid %d", s->pid); | |
1995 | return; | |
1996 | } | |
1997 | if (s->chanid != -1) | |
1998 | session_exit_message(s, status); | |
1999 | session_close(s); | |
2000 | } | |
2001 | ||
2002 | /* | |
2003 | * this is called when a channel dies before | |
2004 | * the session 'child' itself dies | |
2005 | */ | |
2006 | void | |
2007 | session_close_by_channel(int id, void *arg) | |
2008 | { | |
2009 | Session *s = session_by_channel(id); | |
2010 | if (s == NULL) { | |
2011 | debug("session_close_by_channel: no session for channel %d", id); | |
2012 | return; | |
2013 | } | |
2014 | /* disconnect channel */ | |
2015 | channel_cancel_cleanup(s->chanid); | |
2016 | s->chanid = -1; | |
2017 | ||
2018 | debug("session_close_by_channel: channel %d kill %d", id, s->pid); | |
2019 | if (s->pid == 0) { | |
2020 | /* close session immediately */ | |
2021 | session_close(s); | |
2022 | } else { | |
2023 | /* notify child, delay session cleanup */ | |
512ad3c0 | 2024 | if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0) |
e78a59f5 | 2025 | error("session_close_by_channel: kill %d: %s", |
2026 | s->pid, strerror(errno)); | |
2027 | } | |
2028 | } | |
2029 | ||
1d1ffb87 | 2030 | char * |
2031 | session_tty_list(void) | |
2032 | { | |
2033 | static char buf[1024]; | |
2034 | int i; | |
2035 | buf[0] = '\0'; | |
2036 | for(i = 0; i < MAX_SESSIONS; i++) { | |
2037 | Session *s = &sessions[i]; | |
2038 | if (s->used && s->ttyfd != -1) { | |
2039 | if (buf[0] != '\0') | |
2040 | strlcat(buf, ",", sizeof buf); | |
2041 | strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf); | |
2042 | } | |
2043 | } | |
2044 | if (buf[0] == '\0') | |
2045 | strlcpy(buf, "notty", sizeof buf); | |
2046 | return buf; | |
2047 | } | |
2048 | ||
2049 | void | |
2050 | session_proctitle(Session *s) | |
2051 | { | |
2052 | if (s->pw == NULL) | |
2053 | error("no user for session %d", s->self); | |
2054 | else | |
2055 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2056 | } | |
2057 | ||
e78a59f5 | 2058 | void |
59c97189 | 2059 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 2060 | { |
bb5639fe | 2061 | |
e78a59f5 | 2062 | server_loop2(); |
34bce9a5 | 2063 | if (xauthfile) |
2064 | xauthfile_cleanup_proc(NULL); | |
e78a59f5 | 2065 | } |