1 /*-
2 * Copyright (c) 2011 James Gritton
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/types.h>
31 #include <sys/event.h>
32 #include <sys/mount.h>
33 #include <sys/stat.h>
34 #include <sys/sysctl.h>
35 #include <sys/user.h>
36 #include <sys/wait.h>
37
38 #include <err.h>
39 #include <errno.h>
40 #include <fcntl.h>
41 #include <kvm.h>
42 #include <login_cap.h>
43 #include <paths.h>
44 #include <pwd.h>
45 #include <signal.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <unistd.h>
50
51 #include "jailp.h"
52
53 #define DEFAULT_STOP_TIMEOUT 10
54 #define PHASH_SIZE 256
55
56 LIST_HEAD(phhead, phash);
57
58 struct phash {
59 LIST_ENTRY(phash) le;
60 struct cfjail *j;
61 pid_t pid;
62 };
63
64 int paralimit = -1;
65
66 extern char **environ;
67
68 static int run_command(struct cfjail *j);
69 static int add_proc(struct cfjail *j, pid_t pid);
70 static void clear_procs(struct cfjail *j);
71 static struct cfjail *find_proc(pid_t pid);
72 static int term_procs(struct cfjail *j);
73 static int get_user_info(struct cfjail *j, const char *username,
74 const struct passwd **pwdp, login_cap_t **lcapp);
75 static int check_path(struct cfjail *j, const char *pname, const char *path,
76 int isfile, const char *umount_type);
77
78 static struct cfjails sleeping = TAILQ_HEAD_INITIALIZER(sleeping);
79 static struct cfjails runnable = TAILQ_HEAD_INITIALIZER(runnable);
80 static struct cfstring dummystring = { .len = 1 };
81 static struct phhead phash[PHASH_SIZE];
82 static int kq;
83
84 /*
85 * Run the next command associated with a jail.
86 */
87 int
next_command(struct cfjail * j)88 next_command(struct cfjail *j)
89 {
90 enum intparam comparam;
91 int create_failed, stopping;
92
93 if (paralimit == 0) {
94 requeue(j, &runnable);
95 return 1;
96 }
97 create_failed = (j->flags & (JF_STOP | JF_FAILED)) == JF_FAILED;
98 stopping = (j->flags & JF_STOP) != 0;
99 comparam = *j->comparam;
100 for (;;) {
101 if (j->comstring == NULL) {
102 j->comparam += create_failed ? -1 : 1;
103 switch ((comparam = *j->comparam)) {
104 case IP__NULL:
105 return 0;
106 case IP_MOUNT_DEVFS:
107 if (!bool_param(j->intparams[IP_MOUNT_DEVFS]))
108 continue;
109 j->comstring = &dummystring;
110 break;
111 case IP_MOUNT_FDESCFS:
112 if (!bool_param(j->intparams[IP_MOUNT_FDESCFS]))
113 continue;
114 j->comstring = &dummystring;
115 break;
116 case IP_MOUNT_PROCFS:
117 if (!bool_param(j->intparams[IP_MOUNT_PROCFS]))
118 continue;
119 j->comstring = &dummystring;
120 break;
121 case IP__OP:
122 case IP_STOP_TIMEOUT:
123 j->comstring = &dummystring;
124 break;
125 default:
126 if (j->intparams[comparam] == NULL)
127 continue;
128 j->comstring = create_failed || (stopping &&
129 (j->intparams[comparam]->flags & PF_REV))
130 ? TAILQ_LAST(&j->intparams[comparam]->val,
131 cfstrings)
132 : TAILQ_FIRST(&j->intparams[comparam]->val);
133 }
134 } else {
135 j->comstring = j->comstring == &dummystring ? NULL :
136 create_failed || (stopping &&
137 (j->intparams[comparam]->flags & PF_REV))
138 ? TAILQ_PREV(j->comstring, cfstrings, tq)
139 : TAILQ_NEXT(j->comstring, tq);
140 }
141 if (j->comstring == NULL || j->comstring->len == 0 ||
142 (create_failed && (comparam == IP_EXEC_PRESTART ||
143 comparam == IP_EXEC_START || comparam == IP_COMMAND ||
144 comparam == IP_EXEC_POSTSTART)))
145 continue;
146 switch (run_command(j)) {
147 case -1:
148 failed(j);
149 /* FALLTHROUGH */
150 case 1:
151 return 1;
152 }
153 }
154 }
155
156 /*
157 * Check command exit status
158 */
159 int
finish_command(struct cfjail * j)160 finish_command(struct cfjail *j)
161 {
162 int error;
163
164 if (!(j->flags & JF_SLEEPQ))
165 return 0;
166 j->flags &= ~JF_SLEEPQ;
167 if (*j->comparam == IP_STOP_TIMEOUT)
168 {
169 j->flags &= ~JF_TIMEOUT;
170 j->pstatus = 0;
171 return 0;
172 }
173 paralimit++;
174 if (!TAILQ_EMPTY(&runnable))
175 requeue(TAILQ_FIRST(&runnable), &ready);
176 error = 0;
177 if (j->flags & JF_TIMEOUT) {
178 j->flags &= ~JF_TIMEOUT;
179 if (*j->comparam != IP_STOP_TIMEOUT) {
180 jail_warnx(j, "%s: timed out", j->comline);
181 failed(j);
182 error = -1;
183 } else if (verbose > 0)
184 jail_note(j, "timed out\n");
185 } else if (j->pstatus != 0) {
186 if (WIFSIGNALED(j->pstatus))
187 jail_warnx(j, "%s: exited on signal %d",
188 j->comline, WTERMSIG(j->pstatus));
189 else
190 jail_warnx(j, "%s: failed", j->comline);
191 j->pstatus = 0;
192 failed(j);
193 error = -1;
194 }
195 free(j->comline);
196 j->comline = NULL;
197 return error;
198 }
199
200 /*
201 * Check for finished processes or timeouts.
202 */
203 struct cfjail *
next_proc(int nonblock)204 next_proc(int nonblock)
205 {
206 struct kevent ke;
207 struct timespec ts;
208 struct timespec *tsp;
209 struct cfjail *j;
210
211 if (!TAILQ_EMPTY(&sleeping)) {
212 again:
213 tsp = NULL;
214 if ((j = TAILQ_FIRST(&sleeping)) && j->timeout.tv_sec) {
215 clock_gettime(CLOCK_REALTIME, &ts);
216 ts.tv_sec = j->timeout.tv_sec - ts.tv_sec;
217 ts.tv_nsec = j->timeout.tv_nsec - ts.tv_nsec;
218 if (ts.tv_nsec < 0) {
219 ts.tv_sec--;
220 ts.tv_nsec += 1000000000;
221 }
222 if (ts.tv_sec < 0 ||
223 (ts.tv_sec == 0 && ts.tv_nsec == 0)) {
224 j->flags |= JF_TIMEOUT;
225 clear_procs(j);
226 return j;
227 }
228 tsp = &ts;
229 }
230 if (nonblock) {
231 ts.tv_sec = 0;
232 ts.tv_nsec = 0;
233 tsp = &ts;
234 }
235 switch (kevent(kq, NULL, 0, &ke, 1, tsp)) {
236 case -1:
237 if (errno != EINTR)
238 err(1, "kevent");
239 goto again;
240 case 0:
241 if (!nonblock) {
242 j = TAILQ_FIRST(&sleeping);
243 j->flags |= JF_TIMEOUT;
244 clear_procs(j);
245 return j;
246 }
247 break;
248 case 1:
249 (void)waitpid(ke.ident, NULL, WNOHANG);
250 if ((j = find_proc(ke.ident))) {
251 j->pstatus = ke.data;
252 return j;
253 }
254 goto again;
255 }
256 }
257 return NULL;
258 }
259
260 /*
261 * Run a single command for a jail, possible inside the jail.
262 */
263 static int
run_command(struct cfjail * j)264 run_command(struct cfjail *j)
265 {
266 const struct passwd *pwd;
267 const struct cfstring *comstring, *s;
268 login_cap_t *lcap;
269 char **argv;
270 char *cs, *comcs, *devpath;
271 const char *jidstr, *conslog, *path, *ruleset, *term, *username;
272 enum intparam comparam;
273 size_t comlen;
274 pid_t pid;
275 int argc, bg, clean, consfd, down, fib, i, injail, sjuser, timeout;
276 #if defined(INET) || defined(INET6)
277 char *addr, *extrap, *p, *val;
278 #endif
279
280 static char *cleanenv;
281
282 /* Perform some operations that aren't actually commands */
283 comparam = *j->comparam;
284 down = j->flags & (JF_STOP | JF_FAILED);
285 switch (comparam) {
286 case IP_STOP_TIMEOUT:
287 return term_procs(j);
288
289 case IP__OP:
290 if (down) {
291 if (jail_remove(j->jid) < 0 && errno == EPERM) {
292 jail_warnx(j, "jail_remove: %s",
293 strerror(errno));
294 return -1;
295 }
296 if (verbose > 0 || (verbose == 0 && (j->flags & JF_STOP
297 ? note_remove : j->name != NULL)))
298 jail_note(j, "removed\n");
299 j->jid = -1;
300 if (j->flags & JF_STOP)
301 dep_done(j, DF_LIGHT);
302 else
303 j->flags &= ~JF_PERSIST;
304 } else {
305 if (create_jail(j) < 0)
306 return -1;
307 if (iflag)
308 printf("%d\n", j->jid);
309 if (verbose >= 0 && (j->name || verbose > 0))
310 jail_note(j, "created\n");
311 dep_done(j, DF_LIGHT);
312 }
313 return 0;
314
315 default: ;
316 }
317 /*
318 * Collect exec arguments. Internal commands for network and
319 * mounting build their own argument lists.
320 */
321 comstring = j->comstring;
322 bg = 0;
323 switch (comparam) {
324 #ifdef INET
325 case IP__IP4_IFADDR:
326 argc = 0;
327 val = alloca(strlen(comstring->s) + 1);
328 strcpy(val, comstring->s);
329 cs = val;
330 extrap = NULL;
331 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) {
332 if (extrap == NULL) {
333 *p = '\0';
334 extrap = p + 1;
335 }
336 cs = p + 1;
337 argc++;
338 }
339
340 argv = alloca((8 + argc) * sizeof(char *));
341 *(const char **)&argv[0] = _PATH_IFCONFIG;
342 if ((cs = strchr(val, '|'))) {
343 argv[1] = alloca(cs - val + 1);
344 strlcpy(argv[1], val, cs - val + 1);
345 addr = cs + 1;
346 } else {
347 *(const char **)&argv[1] =
348 string_param(j->intparams[IP_INTERFACE]);
349 addr = val;
350 }
351 *(const char **)&argv[2] = "inet";
352 if (!(cs = strchr(addr, '/'))) {
353 argv[3] = addr;
354 *(const char **)&argv[4] = "netmask";
355 *(const char **)&argv[5] = "255.255.255.255";
356 argc = 6;
357 } else if (strchr(cs + 1, '.')) {
358 argv[3] = alloca(cs - addr + 1);
359 strlcpy(argv[3], addr, cs - addr + 1);
360 *(const char **)&argv[4] = "netmask";
361 *(const char **)&argv[5] = cs + 1;
362 argc = 6;
363 } else {
364 argv[3] = addr;
365 argc = 4;
366 }
367
368 if (!down) {
369 for (cs = strtok(extrap, " "); cs; cs = strtok(NULL, " ")) {
370 size_t len = strlen(cs) + 1;
371 argv[argc] = alloca(len);
372 strlcpy(argv[argc++], cs, len);
373 }
374 }
375
376 *(const char **)&argv[argc] = down ? "-alias" : "alias";
377 argv[argc + 1] = NULL;
378 break;
379 #endif
380
381 #ifdef INET6
382 case IP__IP6_IFADDR:
383 argc = 0;
384 val = alloca(strlen(comstring->s) + 1);
385 strcpy(val, comstring->s);
386 cs = val;
387 extrap = NULL;
388 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) {
389 if (extrap == NULL) {
390 *p = '\0';
391 extrap = p + 1;
392 }
393 cs = p + 1;
394 argc++;
395 }
396
397 argv = alloca((8 + argc) * sizeof(char *));
398 *(const char **)&argv[0] = _PATH_IFCONFIG;
399 if ((cs = strchr(val, '|'))) {
400 argv[1] = alloca(cs - val + 1);
401 strlcpy(argv[1], val, cs - val + 1);
402 addr = cs + 1;
403 } else {
404 *(const char **)&argv[1] =
405 string_param(j->intparams[IP_INTERFACE]);
406 addr = val;
407 }
408 *(const char **)&argv[2] = "inet6";
409 argv[3] = addr;
410 if (!(cs = strchr(addr, '/'))) {
411 *(const char **)&argv[4] = "prefixlen";
412 *(const char **)&argv[5] = "128";
413 argc = 6;
414 } else
415 argc = 4;
416
417 if (!down) {
418 for (cs = strtok(extrap, " "); cs; cs = strtok(NULL, " ")) {
419 size_t len = strlen(cs) + 1;
420 argv[argc] = alloca(len);
421 strlcpy(argv[argc++], cs, len);
422 }
423 }
424
425 *(const char **)&argv[argc] = down ? "-alias" : "alias";
426 argv[argc + 1] = NULL;
427 break;
428 #endif
429
430 case IP_VNET_INTERFACE:
431 argv = alloca(5 * sizeof(char *));
432 *(const char **)&argv[0] = _PATH_IFCONFIG;
433 argv[1] = comstring->s;
434 *(const char **)&argv[2] = down ? "-vnet" : "vnet";
435 jidstr = string_param(j->intparams[KP_JID]);
436 *(const char **)&argv[3] =
437 jidstr ? jidstr : string_param(j->intparams[KP_NAME]);
438 argv[4] = NULL;
439 break;
440
441 case IP_MOUNT:
442 case IP__MOUNT_FROM_FSTAB:
443 argv = alloca(8 * sizeof(char *));
444 comcs = alloca(comstring->len + 1);
445 strcpy(comcs, comstring->s);
446 argc = 0;
447 for (cs = strtok(comcs, " \t\f\v\r\n"); cs && argc < 4;
448 cs = strtok(NULL, " \t\f\v\r\n"))
449 argv[argc++] = cs;
450 if (argc == 0)
451 return 0;
452 if (argc < 3) {
453 jail_warnx(j, "%s: %s: missing information",
454 j->intparams[comparam]->name, comstring->s);
455 return -1;
456 }
457 if (check_path(j, j->intparams[comparam]->name, argv[1], 0,
458 down ? argv[2] : NULL) < 0)
459 return -1;
460 if (down) {
461 argv[4] = NULL;
462 argv[3] = argv[1];
463 *(const char **)&argv[0] = "/sbin/umount";
464 } else {
465 if (argc == 4) {
466 argv[7] = NULL;
467 argv[6] = argv[1];
468 argv[5] = argv[0];
469 argv[4] = argv[3];
470 *(const char **)&argv[3] = "-o";
471 } else {
472 argv[5] = NULL;
473 argv[4] = argv[1];
474 argv[3] = argv[0];
475 }
476 *(const char **)&argv[0] = _PATH_MOUNT;
477 }
478 *(const char **)&argv[1] = "-t";
479 break;
480
481 case IP_MOUNT_DEVFS:
482 argv = alloca(7 * sizeof(char *));
483 path = string_param(j->intparams[KP_PATH]);
484 if (path == NULL) {
485 jail_warnx(j, "mount.devfs: no path");
486 return -1;
487 }
488 devpath = alloca(strlen(path) + 5);
489 sprintf(devpath, "%s/dev", path);
490 if (check_path(j, "mount.devfs", devpath, 0,
491 down ? "devfs" : NULL) < 0)
492 return -1;
493 if (down) {
494 *(const char **)&argv[0] = "/sbin/umount";
495 argv[1] = devpath;
496 argv[2] = NULL;
497 } else {
498 *(const char **)&argv[0] = _PATH_MOUNT;
499 *(const char **)&argv[1] = "-t";
500 *(const char **)&argv[2] = "devfs";
501 ruleset = string_param(j->intparams[KP_DEVFS_RULESET]);
502 if (!ruleset)
503 ruleset = "4"; /* devfsrules_jail */
504 argv[3] = alloca(11 + strlen(ruleset));
505 sprintf(argv[3], "-oruleset=%s", ruleset);
506 *(const char **)&argv[4] = ".";
507 argv[5] = devpath;
508 argv[6] = NULL;
509 }
510 break;
511
512 case IP_MOUNT_FDESCFS:
513 argv = alloca(7 * sizeof(char *));
514 path = string_param(j->intparams[KP_PATH]);
515 if (path == NULL) {
516 jail_warnx(j, "mount.fdescfs: no path");
517 return -1;
518 }
519 devpath = alloca(strlen(path) + 8);
520 sprintf(devpath, "%s/dev/fd", path);
521 if (check_path(j, "mount.fdescfs", devpath, 0,
522 down ? "fdescfs" : NULL) < 0)
523 return -1;
524 if (down) {
525 *(const char **)&argv[0] = "/sbin/umount";
526 argv[1] = devpath;
527 argv[2] = NULL;
528 } else {
529 *(const char **)&argv[0] = _PATH_MOUNT;
530 *(const char **)&argv[1] = "-t";
531 *(const char **)&argv[2] = "fdescfs";
532 *(const char **)&argv[3] = ".";
533 argv[4] = devpath;
534 argv[5] = NULL;
535 }
536 break;
537
538 case IP_MOUNT_PROCFS:
539 argv = alloca(7 * sizeof(char *));
540 path = string_param(j->intparams[KP_PATH]);
541 if (path == NULL) {
542 jail_warnx(j, "mount.procfs: no path");
543 return -1;
544 }
545 devpath = alloca(strlen(path) + 6);
546 sprintf(devpath, "%s/proc", path);
547 if (check_path(j, "mount.procfs", devpath, 0,
548 down ? "procfs" : NULL) < 0)
549 return -1;
550 if (down) {
551 *(const char **)&argv[0] = "/sbin/umount";
552 argv[1] = devpath;
553 argv[2] = NULL;
554 } else {
555 *(const char **)&argv[0] = _PATH_MOUNT;
556 *(const char **)&argv[1] = "-t";
557 *(const char **)&argv[2] = "procfs";
558 *(const char **)&argv[3] = ".";
559 argv[4] = devpath;
560 argv[5] = NULL;
561 }
562 break;
563
564 case IP_COMMAND:
565 if (j->name != NULL)
566 goto default_command;
567 argc = 0;
568 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq)
569 argc++;
570 argv = alloca((argc + 1) * sizeof(char *));
571 argc = 0;
572 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq)
573 argv[argc++] = s->s;
574 argv[argc] = NULL;
575 j->comstring = &dummystring;
576 break;
577
578 default:
579 default_command:
580 if ((cs = strpbrk(comstring->s, "!\"$&'()*;<>?[\\]`{|}~")) &&
581 !(cs[0] == '&' && cs[1] == '\0')) {
582 argv = alloca(4 * sizeof(char *));
583 *(const char **)&argv[0] = _PATH_BSHELL;
584 *(const char **)&argv[1] = "-c";
585 argv[2] = comstring->s;
586 argv[3] = NULL;
587 } else {
588 if (cs) {
589 *cs = 0;
590 bg = 1;
591 }
592 comcs = alloca(comstring->len + 1);
593 strcpy(comcs, comstring->s);
594 argc = 0;
595 for (cs = strtok(comcs, " \t\f\v\r\n"); cs;
596 cs = strtok(NULL, " \t\f\v\r\n"))
597 argc++;
598 argv = alloca((argc + 1) * sizeof(char *));
599 strcpy(comcs, comstring->s);
600 argc = 0;
601 for (cs = strtok(comcs, " \t\f\v\r\n"); cs;
602 cs = strtok(NULL, " \t\f\v\r\n"))
603 argv[argc++] = cs;
604 argv[argc] = NULL;
605 }
606 }
607 if (argv[0] == NULL)
608 return 0;
609
610 if (int_param(j->intparams[IP_EXEC_TIMEOUT], &timeout) &&
611 timeout != 0) {
612 clock_gettime(CLOCK_REALTIME, &j->timeout);
613 j->timeout.tv_sec += timeout;
614 } else
615 j->timeout.tv_sec = 0;
616
617 injail = comparam == IP_EXEC_START || comparam == IP_COMMAND ||
618 comparam == IP_EXEC_STOP;
619 clean = bool_param(j->intparams[IP_EXEC_CLEAN]);
620 username = string_param(j->intparams[injail
621 ? IP_EXEC_JAIL_USER : IP_EXEC_SYSTEM_USER]);
622 sjuser = bool_param(j->intparams[IP_EXEC_SYSTEM_JAIL_USER]);
623
624 consfd = 0;
625 if (injail &&
626 (conslog = string_param(j->intparams[IP_EXEC_CONSOLELOG]))) {
627 if (check_path(j, "exec.consolelog", conslog, 1, NULL) < 0)
628 return -1;
629 consfd =
630 open(conslog, O_WRONLY | O_CREAT | O_APPEND, DEFFILEMODE);
631 if (consfd < 0) {
632 jail_warnx(j, "open %s: %s", conslog, strerror(errno));
633 return -1;
634 }
635 }
636
637 comlen = 0;
638 for (i = 0; argv[i]; i++)
639 comlen += strlen(argv[i]) + 1;
640 j->comline = cs = emalloc(comlen);
641 for (i = 0; argv[i]; i++) {
642 strcpy(cs, argv[i]);
643 if (argv[i + 1]) {
644 cs += strlen(argv[i]) + 1;
645 cs[-1] = ' ';
646 }
647 }
648 if (verbose > 0)
649 jail_note(j, "run command%s%s%s: %s\n",
650 injail ? " in jail" : "", username ? " as " : "",
651 username ? username : "", j->comline);
652
653 pid = fork();
654 if (pid < 0)
655 err(1, "fork");
656 if (pid > 0) {
657 if (bg || !add_proc(j, pid)) {
658 free(j->comline);
659 j->comline = NULL;
660 return 0;
661 } else {
662 paralimit--;
663 return 1;
664 }
665 }
666 if (bg)
667 setsid();
668
669 /* Set up the environment and run the command */
670 pwd = NULL;
671 lcap = NULL;
672 if ((clean || username) && injail && sjuser &&
673 get_user_info(j, username, &pwd, &lcap) < 0)
674 exit(1);
675 if (injail) {
676 /* jail_attach won't chdir along with its chroot. */
677 path = string_param(j->intparams[KP_PATH]);
678 if (path && chdir(path) < 0) {
679 jail_warnx(j, "chdir %s: %s", path, strerror(errno));
680 exit(1);
681 }
682 if (int_param(j->intparams[IP_EXEC_FIB], &fib) &&
683 setfib(fib) < 0) {
684 jail_warnx(j, "setfib: %s", strerror(errno));
685 exit(1);
686 }
687 if (jail_attach(j->jid) < 0) {
688 jail_warnx(j, "jail_attach: %s", strerror(errno));
689 exit(1);
690 }
691 }
692 if (clean || username) {
693 if (!(injail && sjuser) &&
694 get_user_info(j, username, &pwd, &lcap) < 0)
695 exit(1);
696 if (clean) {
697 term = getenv("TERM");
698 environ = &cleanenv;
699 setenv("PATH", "/bin:/usr/bin", 0);
700 if (term != NULL)
701 setenv("TERM", term, 1);
702 }
703 if (setgid(pwd->pw_gid) < 0) {
704 jail_warnx(j, "setgid %d: %s", pwd->pw_gid,
705 strerror(errno));
706 exit(1);
707 }
708 if (setusercontext(lcap, pwd, pwd->pw_uid, username
709 ? LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN
710 : LOGIN_SETPATH | LOGIN_SETENV) < 0) {
711 jail_warnx(j, "setusercontext %s: %s", pwd->pw_name,
712 strerror(errno));
713 exit(1);
714 }
715 login_close(lcap);
716 setenv("USER", pwd->pw_name, 1);
717 setenv("HOME", pwd->pw_dir, 1);
718 setenv("SHELL",
719 *pwd->pw_shell ? pwd->pw_shell : _PATH_BSHELL, 1);
720 if (clean && chdir(pwd->pw_dir) < 0) {
721 jail_warnx(j, "chdir %s: %s",
722 pwd->pw_dir, strerror(errno));
723 exit(1);
724 }
725 endpwent();
726 }
727
728 if (consfd != 0 && (dup2(consfd, 1) < 0 || dup2(consfd, 2) < 0)) {
729 jail_warnx(j, "exec.consolelog: %s", strerror(errno));
730 exit(1);
731 }
732 closefrom(3);
733 execvp(argv[0], argv);
734 jail_warnx(j, "exec %s: %s", argv[0], strerror(errno));
735 exit(1);
736 }
737
738 /*
739 * Add a process to the hash, tied to a jail.
740 */
741 static int
add_proc(struct cfjail * j,pid_t pid)742 add_proc(struct cfjail *j, pid_t pid)
743 {
744 struct kevent ke;
745 struct cfjail *tj;
746 struct phash *ph;
747
748 if (!kq && (kq = kqueue()) < 0)
749 err(1, "kqueue");
750 EV_SET(&ke, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL);
751 if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0) {
752 if (errno == ESRCH)
753 return 0;
754 err(1, "kevent");
755 }
756 ph = emalloc(sizeof(struct phash));
757 ph->j = j;
758 ph->pid = pid;
759 LIST_INSERT_HEAD(&phash[pid % PHASH_SIZE], ph, le);
760 j->nprocs++;
761 j->flags |= JF_SLEEPQ;
762 if (j->timeout.tv_sec == 0)
763 requeue(j, &sleeping);
764 else {
765 /* File the jail in the sleep queue acording to its timeout. */
766 TAILQ_REMOVE(j->queue, j, tq);
767 TAILQ_FOREACH(tj, &sleeping, tq) {
768 if (!tj->timeout.tv_sec ||
769 j->timeout.tv_sec < tj->timeout.tv_sec ||
770 (j->timeout.tv_sec == tj->timeout.tv_sec &&
771 j->timeout.tv_nsec <= tj->timeout.tv_nsec)) {
772 TAILQ_INSERT_BEFORE(tj, j, tq);
773 break;
774 }
775 }
776 if (tj == NULL)
777 TAILQ_INSERT_TAIL(&sleeping, j, tq);
778 j->queue = &sleeping;
779 }
780 return 1;
781 }
782
783 /*
784 * Remove any processes from the hash that correspond to a jail.
785 */
786 static void
clear_procs(struct cfjail * j)787 clear_procs(struct cfjail *j)
788 {
789 struct kevent ke;
790 struct phash *ph, *tph;
791 int i;
792
793 j->nprocs = 0;
794 for (i = 0; i < PHASH_SIZE; i++)
795 LIST_FOREACH_SAFE(ph, &phash[i], le, tph)
796 if (ph->j == j) {
797 EV_SET(&ke, ph->pid, EVFILT_PROC, EV_DELETE,
798 NOTE_EXIT, 0, NULL);
799 (void)kevent(kq, &ke, 1, NULL, 0, NULL);
800 LIST_REMOVE(ph, le);
801 free(ph);
802 }
803 }
804
805 /*
806 * Find the jail that corresponds to an exited process.
807 */
808 static struct cfjail *
find_proc(pid_t pid)809 find_proc(pid_t pid)
810 {
811 struct cfjail *j;
812 struct phash *ph;
813
814 LIST_FOREACH(ph, &phash[pid % PHASH_SIZE], le)
815 if (ph->pid == pid) {
816 j = ph->j;
817 LIST_REMOVE(ph, le);
818 free(ph);
819 return --j->nprocs ? NULL : j;
820 }
821 return NULL;
822 }
823
824 /*
825 * Send SIGTERM to all processes in a jail and wait for them to die.
826 */
827 static int
term_procs(struct cfjail * j)828 term_procs(struct cfjail *j)
829 {
830 struct kinfo_proc *ki;
831 int i, noted, pcnt, timeout;
832
833 static kvm_t *kd;
834
835 if (!int_param(j->intparams[IP_STOP_TIMEOUT], &timeout))
836 timeout = DEFAULT_STOP_TIMEOUT;
837 else if (timeout == 0)
838 return 0;
839
840 if (kd == NULL) {
841 kd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL);
842 if (kd == NULL)
843 return 0;
844 }
845
846 ki = kvm_getprocs(kd, KERN_PROC_PROC, 0, &pcnt);
847 if (ki == NULL)
848 return 0;
849 noted = 0;
850 for (i = 0; i < pcnt; i++)
851 if (ki[i].ki_jid == j->jid &&
852 kill(ki[i].ki_pid, SIGTERM) == 0) {
853 (void)add_proc(j, ki[i].ki_pid);
854 if (verbose > 0) {
855 if (!noted) {
856 noted = 1;
857 jail_note(j, "sent SIGTERM to:");
858 }
859 printf(" %d", ki[i].ki_pid);
860 }
861 }
862 if (noted)
863 printf("\n");
864 if (j->nprocs > 0) {
865 clock_gettime(CLOCK_REALTIME, &j->timeout);
866 j->timeout.tv_sec += timeout;
867 return 1;
868 }
869 return 0;
870 }
871
872 /*
873 * Look up a user in the passwd and login.conf files.
874 */
875 static int
get_user_info(struct cfjail * j,const char * username,const struct passwd ** pwdp,login_cap_t ** lcapp)876 get_user_info(struct cfjail *j, const char *username,
877 const struct passwd **pwdp, login_cap_t **lcapp)
878 {
879 const struct passwd *pwd;
880
881 *pwdp = pwd = username ? getpwnam(username) : getpwuid(getuid());
882 if (pwd == NULL) {
883 if (errno)
884 jail_warnx(j, "getpwnam%s%s: %s", username ? " " : "",
885 username ? username : "", strerror(errno));
886 else if (username)
887 jail_warnx(j, "%s: no such user", username);
888 else
889 jail_warnx(j, "unknown uid %d", getuid());
890 return -1;
891 }
892 *lcapp = login_getpwclass(pwd);
893 if (*lcapp == NULL) {
894 jail_warnx(j, "getpwclass %s: %s", pwd->pw_name,
895 strerror(errno));
896 return -1;
897 }
898 /* Set the groups while the group file is still available */
899 if (initgroups(pwd->pw_name, pwd->pw_gid) < 0) {
900 jail_warnx(j, "initgroups %s: %s", pwd->pw_name,
901 strerror(errno));
902 return -1;
903 }
904 return 0;
905 }
906
907 /*
908 * Make sure a mount or consolelog path is a valid absolute pathname
909 * with no symlinks.
910 */
911 static int
check_path(struct cfjail * j,const char * pname,const char * path,int isfile,const char * umount_type)912 check_path(struct cfjail *j, const char *pname, const char *path, int isfile,
913 const char *umount_type)
914 {
915 struct stat st, mpst;
916 struct statfs stfs;
917 char *tpath, *p;
918 const char *jailpath;
919 size_t jplen;
920
921 if (path[0] != '/') {
922 jail_warnx(j, "%s: %s: not an absolute pathname",
923 pname, path);
924 return -1;
925 }
926 /*
927 * Only check for symlinks in components below the jail's path,
928 * since that's where the security risk lies.
929 */
930 jailpath = string_param(j->intparams[KP_PATH]);
931 if (jailpath == NULL)
932 jailpath = "";
933 jplen = strlen(jailpath);
934 if (!strncmp(path, jailpath, jplen) && path[jplen] == '/') {
935 tpath = alloca(strlen(path) + 1);
936 strcpy(tpath, path);
937 for (p = tpath + jplen; p != NULL; ) {
938 p = strchr(p + 1, '/');
939 if (p)
940 *p = '\0';
941 if (lstat(tpath, &st) < 0) {
942 if (errno == ENOENT && isfile && !p)
943 break;
944 jail_warnx(j, "%s: %s: %s", pname, tpath,
945 strerror(errno));
946 return -1;
947 }
948 if (S_ISLNK(st.st_mode)) {
949 jail_warnx(j, "%s: %s is a symbolic link",
950 pname, tpath);
951 return -1;
952 }
953 if (p)
954 *p = '/';
955 }
956 }
957 if (umount_type != NULL) {
958 if (stat(path, &st) < 0 || statfs(path, &stfs) < 0) {
959 jail_warnx(j, "%s: %s: %s", pname, path,
960 strerror(errno));
961 return -1;
962 }
963 if (stat(stfs.f_mntonname, &mpst) < 0) {
964 jail_warnx(j, "%s: %s: %s", pname, stfs.f_mntonname,
965 strerror(errno));
966 return -1;
967 }
968 if (st.st_ino != mpst.st_ino) {
969 jail_warnx(j, "%s: %s: not a mount point",
970 pname, path);
971 return -1;
972 }
973 if (strcmp(stfs.f_fstypename, umount_type)) {
974 jail_warnx(j, "%s: %s: not a %s mount",
975 pname, path, umount_type);
976 return -1;
977 }
978 }
979 return 0;
980 }
981