1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2011 James Gritton
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/types.h>
33 #include <sys/event.h>
34 #include <sys/mount.h>
35 #include <sys/stat.h>
36 #include <sys/sysctl.h>
37 #include <sys/user.h>
38 #include <sys/wait.h>
39
40 #include <err.h>
41 #include <errno.h>
42 #include <fcntl.h>
43 #include <kvm.h>
44 #include <login_cap.h>
45 #include <paths.h>
46 #include <pwd.h>
47 #include <signal.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <unistd.h>
52 #include <vis.h>
53
54 #include "jailp.h"
55
56 #define DEFAULT_STOP_TIMEOUT 10
57 #define PHASH_SIZE 256
58
59 LIST_HEAD(phhead, phash);
60
61 struct phash {
62 LIST_ENTRY(phash) le;
63 struct cfjail *j;
64 pid_t pid;
65 };
66
67 int paralimit = -1;
68
69 extern char **environ;
70
71 static int run_command(struct cfjail *j);
72 static int add_proc(struct cfjail *j, pid_t pid);
73 static void clear_procs(struct cfjail *j);
74 static struct cfjail *find_proc(pid_t pid);
75 static int term_procs(struct cfjail *j);
76 static int get_user_info(struct cfjail *j, const char *username,
77 const struct passwd **pwdp, login_cap_t **lcapp);
78 static int check_path(struct cfjail *j, const char *pname, const char *path,
79 int isfile, const char *umount_type);
80
81 static struct cfjails sleeping = TAILQ_HEAD_INITIALIZER(sleeping);
82 static struct cfjails runnable = TAILQ_HEAD_INITIALIZER(runnable);
83 static struct cfstring dummystring = { .len = 1 };
84 static struct phhead phash[PHASH_SIZE];
85 static int kq;
86
87 /*
88 * Run the next command associated with a jail.
89 */
90 int
next_command(struct cfjail * j)91 next_command(struct cfjail *j)
92 {
93 enum intparam comparam;
94 int create_failed, stopping;
95
96 if (paralimit == 0) {
97 if (j->flags & JF_FROM_RUNQ)
98 requeue_head(j, &runnable);
99 else
100 requeue(j, &runnable);
101 return 1;
102 }
103 j->flags &= ~JF_FROM_RUNQ;
104 create_failed = (j->flags & (JF_STOP | JF_FAILED)) == JF_FAILED;
105 stopping = (j->flags & JF_STOP) != 0;
106 comparam = *j->comparam;
107 for (;;) {
108 if (j->comstring == NULL) {
109 j->comparam += create_failed ? -1 : 1;
110 switch ((comparam = *j->comparam)) {
111 case IP__NULL:
112 return 0;
113 case IP_MOUNT_DEVFS:
114 if (!bool_param(j->intparams[IP_MOUNT_DEVFS]))
115 continue;
116 j->comstring = &dummystring;
117 break;
118 case IP_MOUNT_FDESCFS:
119 if (!bool_param(j->intparams[IP_MOUNT_FDESCFS]))
120 continue;
121 j->comstring = &dummystring;
122 break;
123 case IP_MOUNT_PROCFS:
124 if (!bool_param(j->intparams[IP_MOUNT_PROCFS]))
125 continue;
126 j->comstring = &dummystring;
127 break;
128 case IP__OP:
129 case IP_STOP_TIMEOUT:
130 j->comstring = &dummystring;
131 break;
132 default:
133 if (j->intparams[comparam] == NULL)
134 continue;
135 j->comstring = create_failed || (stopping &&
136 (j->intparams[comparam]->flags & PF_REV))
137 ? TAILQ_LAST(&j->intparams[comparam]->val,
138 cfstrings)
139 : TAILQ_FIRST(&j->intparams[comparam]->val);
140 }
141 } else {
142 j->comstring = j->comstring == &dummystring ? NULL :
143 create_failed || (stopping &&
144 (j->intparams[comparam]->flags & PF_REV))
145 ? TAILQ_PREV(j->comstring, cfstrings, tq)
146 : TAILQ_NEXT(j->comstring, tq);
147 }
148 if (j->comstring == NULL || j->comstring->len == 0 ||
149 (create_failed && (comparam == IP_EXEC_PRESTART ||
150 comparam == IP_EXEC_CREATED || comparam == IP_EXEC_START ||
151 comparam == IP_COMMAND || comparam == IP_EXEC_POSTSTART)))
152 continue;
153 switch (run_command(j)) {
154 case -1:
155 failed(j);
156 /* FALLTHROUGH */
157 case 1:
158 return 1;
159 }
160 }
161 }
162
163 /*
164 * Check command exit status
165 */
166 int
finish_command(struct cfjail * j)167 finish_command(struct cfjail *j)
168 {
169 struct cfjail *rj;
170 int error;
171
172 if (!(j->flags & JF_SLEEPQ))
173 return 0;
174 j->flags &= ~JF_SLEEPQ;
175 if (*j->comparam == IP_STOP_TIMEOUT) {
176 j->flags &= ~JF_TIMEOUT;
177 j->pstatus = 0;
178 return 0;
179 }
180 paralimit++;
181 if (!TAILQ_EMPTY(&runnable)) {
182 rj = TAILQ_FIRST(&runnable);
183 rj->flags |= JF_FROM_RUNQ;
184 requeue(rj, &ready);
185 }
186 error = 0;
187 if (j->flags & JF_TIMEOUT) {
188 j->flags &= ~JF_TIMEOUT;
189 if (*j->comparam != IP_STOP_TIMEOUT) {
190 jail_warnx(j, "%s: timed out", j->comline);
191 failed(j);
192 error = -1;
193 } else if (verbose > 0)
194 jail_note(j, "timed out\n");
195 } else if (j->pstatus != 0) {
196 if (WIFSIGNALED(j->pstatus))
197 jail_warnx(j, "%s: exited on signal %d",
198 j->comline, WTERMSIG(j->pstatus));
199 else
200 jail_warnx(j, "%s: failed", j->comline);
201 j->pstatus = 0;
202 failed(j);
203 error = -1;
204 }
205 free(j->comline);
206 j->comline = NULL;
207 return error;
208 }
209
210 /*
211 * Check for finished processes or timeouts.
212 */
213 struct cfjail *
next_proc(int nonblock)214 next_proc(int nonblock)
215 {
216 struct kevent ke;
217 struct timespec ts;
218 struct timespec *tsp;
219 struct cfjail *j;
220
221 if (!TAILQ_EMPTY(&sleeping)) {
222 again:
223 tsp = NULL;
224 if ((j = TAILQ_FIRST(&sleeping)) && j->timeout.tv_sec) {
225 clock_gettime(CLOCK_REALTIME, &ts);
226 ts.tv_sec = j->timeout.tv_sec - ts.tv_sec;
227 ts.tv_nsec = j->timeout.tv_nsec - ts.tv_nsec;
228 if (ts.tv_nsec < 0) {
229 ts.tv_sec--;
230 ts.tv_nsec += 1000000000;
231 }
232 if (ts.tv_sec < 0 ||
233 (ts.tv_sec == 0 && ts.tv_nsec == 0)) {
234 j->flags |= JF_TIMEOUT;
235 clear_procs(j);
236 return j;
237 }
238 tsp = &ts;
239 }
240 if (nonblock) {
241 ts.tv_sec = 0;
242 ts.tv_nsec = 0;
243 tsp = &ts;
244 }
245 switch (kevent(kq, NULL, 0, &ke, 1, tsp)) {
246 case -1:
247 if (errno != EINTR)
248 err(1, "kevent");
249 goto again;
250 case 0:
251 if (!nonblock) {
252 j = TAILQ_FIRST(&sleeping);
253 j->flags |= JF_TIMEOUT;
254 clear_procs(j);
255 return j;
256 }
257 break;
258 case 1:
259 (void)waitpid(ke.ident, NULL, WNOHANG);
260 if ((j = find_proc(ke.ident))) {
261 j->pstatus = ke.data;
262 return j;
263 }
264 goto again;
265 }
266 }
267 return NULL;
268 }
269
270 /*
271 * Run a single command for a jail, possibly inside the jail.
272 */
273 static int
run_command(struct cfjail * j)274 run_command(struct cfjail *j)
275 {
276 const struct passwd *pwd;
277 const struct cfstring *comstring, *s;
278 login_cap_t *lcap;
279 const char **argv;
280 char *acs, *cs, *comcs, *devpath;
281 const char *jidstr, *conslog, *path, *ruleset, *term, *username;
282 enum intparam comparam;
283 size_t comlen;
284 pid_t pid;
285 int argc, bg, clean, consfd, down, fib, i, injail, sjuser, timeout;
286 #if defined(INET) || defined(INET6)
287 char *addr, *extrap, *p, *val;
288 #endif
289
290 static char *cleanenv;
291
292 /* Perform some operations that aren't actually commands */
293 comparam = *j->comparam;
294 down = j->flags & (JF_STOP | JF_FAILED);
295 switch (comparam) {
296 case IP_STOP_TIMEOUT:
297 return term_procs(j);
298
299 case IP__OP:
300 if (down) {
301 if (jail_remove(j->jid) < 0 && errno == EPERM) {
302 jail_warnx(j, "jail_remove: %s",
303 strerror(errno));
304 return -1;
305 }
306 if (verbose > 0 || (verbose == 0 && (j->flags & JF_STOP
307 ? note_remove : j->name != NULL)))
308 jail_note(j, "removed\n");
309 j->jid = -1;
310 if (j->flags & JF_STOP)
311 dep_done(j, DF_LIGHT);
312 else
313 j->flags &= ~JF_PERSIST;
314 } else {
315 if (create_jail(j) < 0)
316 return -1;
317 if (iflag)
318 printf("%d\n", j->jid);
319 if (verbose >= 0 && (j->name || verbose > 0))
320 jail_note(j, "created\n");
321 dep_done(j, DF_LIGHT);
322 }
323 return 0;
324
325 default: ;
326 }
327 /*
328 * Collect exec arguments. Internal commands for network and
329 * mounting build their own argument lists.
330 */
331 comstring = j->comstring;
332 bg = 0;
333 switch (comparam) {
334 #ifdef INET
335 case IP__IP4_IFADDR:
336 argc = 0;
337 val = alloca(strlen(comstring->s) + 1);
338 strcpy(val, comstring->s);
339 cs = val;
340 extrap = NULL;
341 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) {
342 if (extrap == NULL) {
343 *p = '\0';
344 extrap = p + 1;
345 }
346 cs = p + 1;
347 argc++;
348 }
349
350 argv = alloca((8 + argc) * sizeof(char *));
351 argv[0] = _PATH_IFCONFIG;
352 if ((cs = strchr(val, '|'))) {
353 argv[1] = acs = alloca(cs - val + 1);
354 strlcpy(acs, val, cs - val + 1);
355 addr = cs + 1;
356 } else {
357 argv[1] = string_param(j->intparams[IP_INTERFACE]);
358 addr = val;
359 }
360 argv[2] = "inet";
361 if (!(cs = strchr(addr, '/'))) {
362 argv[3] = addr;
363 argv[4] = "netmask";
364 argv[5] = "255.255.255.255";
365 argc = 6;
366 } else if (strchr(cs + 1, '.')) {
367 argv[3] = acs = alloca(cs - addr + 1);
368 strlcpy(acs, addr, cs - addr + 1);
369 argv[4] = "netmask";
370 argv[5] = cs + 1;
371 argc = 6;
372 } else {
373 argv[3] = addr;
374 argc = 4;
375 }
376
377 if (!down && extrap != NULL) {
378 for (cs = strtok(extrap, " "); cs;
379 cs = strtok(NULL, " ")) {
380 size_t len = strlen(cs) + 1;
381 argv[argc++] = acs = alloca(len);
382 strlcpy(acs, cs, len);
383 }
384 }
385
386 argv[argc] = down ? "-alias" : "alias";
387 argv[argc + 1] = NULL;
388 break;
389 #endif
390
391 #ifdef INET6
392 case IP__IP6_IFADDR:
393 argc = 0;
394 val = alloca(strlen(comstring->s) + 1);
395 strcpy(val, comstring->s);
396 cs = val;
397 extrap = NULL;
398 while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) {
399 if (extrap == NULL) {
400 *p = '\0';
401 extrap = p + 1;
402 }
403 cs = p + 1;
404 argc++;
405 }
406
407 argv = alloca((8 + argc) * sizeof(char *));
408 argv[0] = _PATH_IFCONFIG;
409 if ((cs = strchr(val, '|'))) {
410 argv[1] = acs = alloca(cs - val + 1);
411 strlcpy(acs, val, cs - val + 1);
412 addr = cs + 1;
413 } else {
414 argv[1] = string_param(j->intparams[IP_INTERFACE]);
415 addr = val;
416 }
417 argv[2] = "inet6";
418 argv[3] = addr;
419 if (!(cs = strchr(addr, '/'))) {
420 argv[4] = "prefixlen";
421 argv[5] = "128";
422 argc = 6;
423 } else
424 argc = 4;
425
426 if (!down) {
427 for (cs = strtok(extrap, " "); cs;
428 cs = strtok(NULL, " ")) {
429 size_t len = strlen(cs) + 1;
430 argv[argc++] = acs = alloca(len);
431 strlcpy(acs, cs, len);
432 }
433 }
434
435 argv[argc] = down ? "-alias" : "alias";
436 argv[argc + 1] = NULL;
437 break;
438 #endif
439
440 case IP_VNET_INTERFACE:
441 argv = alloca(5 * sizeof(char *));
442 argv[0] = _PATH_IFCONFIG;
443 argv[1] = comstring->s;
444 argv[2] = down ? "-vnet" : "vnet";
445 jidstr = string_param(j->intparams[KP_JID]);
446 argv[3] = jidstr ? jidstr : string_param(j->intparams[KP_NAME]);
447 argv[4] = NULL;
448 break;
449
450 case IP_MOUNT:
451 case IP__MOUNT_FROM_FSTAB:
452 argv = alloca(8 * sizeof(char *));
453 comcs = alloca(comstring->len + 1);
454 strcpy(comcs, comstring->s);
455 argc = 0;
456 for (cs = strtok(comcs, " \t\f\v\r\n"); cs && argc < 4;
457 cs = strtok(NULL, " \t\f\v\r\n")) {
458 if (argc <= 1 && strunvis(cs, cs) < 0) {
459 jail_warnx(j, "%s: %s: fstab parse error",
460 j->intparams[comparam]->name, comstring->s);
461 return -1;
462 }
463 argv[argc++] = cs;
464 }
465 if (argc == 0)
466 return 0;
467 if (argc < 3) {
468 jail_warnx(j, "%s: %s: missing information",
469 j->intparams[comparam]->name, comstring->s);
470 return -1;
471 }
472 if (check_path(j, j->intparams[comparam]->name, argv[1], 0,
473 down ? argv[2] : NULL) < 0)
474 return -1;
475 if (down) {
476 argv[4] = NULL;
477 argv[3] = argv[1];
478 argv[1] = "-ft";
479 argv[0] = "/sbin/umount";
480 } else {
481 if (argc == 4) {
482 argv[7] = NULL;
483 argv[6] = argv[1];
484 argv[5] = argv[0];
485 argv[4] = argv[3];
486 argv[3] = "-o";
487 } else {
488 argv[5] = NULL;
489 argv[4] = argv[1];
490 argv[3] = argv[0];
491 }
492 argv[1] = "-t";
493 argv[0] = _PATH_MOUNT;
494 }
495 break;
496
497 case IP_MOUNT_DEVFS:
498 argv = alloca(7 * sizeof(char *));
499 path = string_param(j->intparams[KP_PATH]);
500 if (path == NULL) {
501 jail_warnx(j, "mount.devfs: no jail root path defined");
502 return -1;
503 }
504 devpath = alloca(strlen(path) + 5);
505 sprintf(devpath, "%s/dev", path);
506 if (check_path(j, "mount.devfs", devpath, 0,
507 down ? "devfs" : NULL) < 0)
508 return -1;
509 if (down) {
510 argv[0] = "/sbin/umount";
511 argv[1] = devpath;
512 argv[2] = NULL;
513 } else {
514 argv[0] = _PATH_MOUNT;
515 argv[1] = "-t";
516 argv[2] = "devfs";
517 ruleset = string_param(j->intparams[KP_DEVFS_RULESET]);
518 if (!ruleset)
519 ruleset = "4"; /* devfsrules_jail */
520 argv[3] = acs = alloca(11 + strlen(ruleset));
521 sprintf(acs, "-oruleset=%s", ruleset);
522 argv[4] = ".";
523 argv[5] = devpath;
524 argv[6] = NULL;
525 }
526 break;
527
528 case IP_MOUNT_FDESCFS:
529 argv = alloca(7 * sizeof(char *));
530 path = string_param(j->intparams[KP_PATH]);
531 if (path == NULL) {
532 jail_warnx(j, "mount.fdescfs: no jail root path defined");
533 return -1;
534 }
535 devpath = alloca(strlen(path) + 8);
536 sprintf(devpath, "%s/dev/fd", path);
537 if (check_path(j, "mount.fdescfs", devpath, 0,
538 down ? "fdescfs" : NULL) < 0)
539 return -1;
540 if (down) {
541 argv[0] = "/sbin/umount";
542 argv[1] = devpath;
543 argv[2] = NULL;
544 } else {
545 argv[0] = _PATH_MOUNT;
546 argv[1] = "-t";
547 argv[2] = "fdescfs";
548 argv[3] = ".";
549 argv[4] = devpath;
550 argv[5] = NULL;
551 }
552 break;
553
554 case IP_MOUNT_PROCFS:
555 argv = alloca(7 * sizeof(char *));
556 path = string_param(j->intparams[KP_PATH]);
557 if (path == NULL) {
558 jail_warnx(j, "mount.procfs: no jail root path defined");
559 return -1;
560 }
561 devpath = alloca(strlen(path) + 6);
562 sprintf(devpath, "%s/proc", path);
563 if (check_path(j, "mount.procfs", devpath, 0,
564 down ? "procfs" : NULL) < 0)
565 return -1;
566 if (down) {
567 argv[0] = "/sbin/umount";
568 argv[1] = devpath;
569 argv[2] = NULL;
570 } else {
571 argv[0] = _PATH_MOUNT;
572 argv[1] = "-t";
573 argv[2] = "procfs";
574 argv[3] = ".";
575 argv[4] = devpath;
576 argv[5] = NULL;
577 }
578 break;
579
580 case IP_COMMAND:
581 if (j->name != NULL)
582 goto default_command;
583 argc = 0;
584 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq)
585 argc++;
586 argv = alloca((argc + 1) * sizeof(char *));
587 argc = 0;
588 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq)
589 argv[argc++] = s->s;
590 argv[argc] = NULL;
591 j->comstring = &dummystring;
592 break;
593
594 default:
595 default_command:
596 if ((cs = strpbrk(comstring->s, "!\"$&'()*;<>?[\\]`{|}~")) &&
597 !(cs[0] == '&' && cs[1] == '\0')) {
598 argv = alloca(4 * sizeof(char *));
599 argv[0] = _PATH_BSHELL;
600 argv[1] = "-c";
601 argv[2] = comstring->s;
602 argv[3] = NULL;
603 } else {
604 if (cs) {
605 *cs = 0;
606 bg = 1;
607 }
608 comcs = alloca(comstring->len + 1);
609 strcpy(comcs, comstring->s);
610 argc = 0;
611 for (cs = strtok(comcs, " \t\f\v\r\n"); cs;
612 cs = strtok(NULL, " \t\f\v\r\n"))
613 argc++;
614 argv = alloca((argc + 1) * sizeof(char *));
615 strcpy(comcs, comstring->s);
616 argc = 0;
617 for (cs = strtok(comcs, " \t\f\v\r\n"); cs;
618 cs = strtok(NULL, " \t\f\v\r\n"))
619 argv[argc++] = cs;
620 argv[argc] = NULL;
621 }
622 }
623 if (argv[0] == NULL)
624 return 0;
625
626 if (int_param(j->intparams[IP_EXEC_TIMEOUT], &timeout) &&
627 timeout != 0) {
628 clock_gettime(CLOCK_REALTIME, &j->timeout);
629 j->timeout.tv_sec += timeout;
630 } else
631 j->timeout.tv_sec = 0;
632
633 injail = comparam == IP_EXEC_START || comparam == IP_COMMAND ||
634 comparam == IP_EXEC_STOP;
635 clean = bool_param(j->intparams[IP_EXEC_CLEAN]);
636 username = string_param(j->intparams[injail
637 ? IP_EXEC_JAIL_USER : IP_EXEC_SYSTEM_USER]);
638 sjuser = bool_param(j->intparams[IP_EXEC_SYSTEM_JAIL_USER]);
639
640 consfd = 0;
641 if (injail &&
642 (conslog = string_param(j->intparams[IP_EXEC_CONSOLELOG]))) {
643 if (check_path(j, "exec.consolelog", conslog, 1, NULL) < 0)
644 return -1;
645 consfd =
646 open(conslog, O_WRONLY | O_CREAT | O_APPEND, DEFFILEMODE);
647 if (consfd < 0) {
648 jail_warnx(j, "open %s: %s", conslog, strerror(errno));
649 return -1;
650 }
651 }
652
653 comlen = 0;
654 for (i = 0; argv[i]; i++)
655 comlen += strlen(argv[i]) + 1;
656 j->comline = cs = emalloc(comlen);
657 for (i = 0; argv[i]; i++) {
658 strcpy(cs, argv[i]);
659 if (argv[i + 1]) {
660 cs += strlen(argv[i]) + 1;
661 cs[-1] = ' ';
662 }
663 }
664 if (verbose > 0)
665 jail_note(j, "run command%s%s%s: %s\n",
666 injail ? " in jail" : "", username ? " as " : "",
667 username ? username : "", j->comline);
668
669 pid = fork();
670 if (pid < 0)
671 err(1, "fork");
672 if (pid > 0) {
673 if (bg || !add_proc(j, pid)) {
674 free(j->comline);
675 j->comline = NULL;
676 return 0;
677 } else {
678 paralimit--;
679 return 1;
680 }
681 }
682 if (bg)
683 setsid();
684
685 /* Set up the environment and run the command */
686 pwd = NULL;
687 lcap = NULL;
688 if ((clean || username) && injail && sjuser &&
689 get_user_info(j, username, &pwd, &lcap) < 0)
690 exit(1);
691 if (injail) {
692 /* jail_attach won't chdir along with its chroot. */
693 path = string_param(j->intparams[KP_PATH]);
694 if (path && chdir(path) < 0) {
695 jail_warnx(j, "chdir %s: %s", path, strerror(errno));
696 exit(1);
697 }
698 if (int_param(j->intparams[IP_EXEC_FIB], &fib) &&
699 setfib(fib) < 0) {
700 jail_warnx(j, "setfib: %s", strerror(errno));
701 exit(1);
702 }
703 if (jail_attach(j->jid) < 0) {
704 jail_warnx(j, "jail_attach: %s", strerror(errno));
705 exit(1);
706 }
707 }
708 if (clean || username) {
709 if (!(injail && sjuser) &&
710 get_user_info(j, username, &pwd, &lcap) < 0)
711 exit(1);
712 if (clean) {
713 term = getenv("TERM");
714 environ = &cleanenv;
715 setenv("PATH", "/bin:/usr/bin", 0);
716 if (term != NULL)
717 setenv("TERM", term, 1);
718 }
719 if (setgid(pwd->pw_gid) < 0) {
720 jail_warnx(j, "setgid %d: %s", pwd->pw_gid,
721 strerror(errno));
722 exit(1);
723 }
724 if (setusercontext(lcap, pwd, pwd->pw_uid, username
725 ? LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN
726 : LOGIN_SETPATH | LOGIN_SETENV) < 0) {
727 jail_warnx(j, "setusercontext %s: %s", pwd->pw_name,
728 strerror(errno));
729 exit(1);
730 }
731 login_close(lcap);
732 setenv("USER", pwd->pw_name, 1);
733 setenv("HOME", pwd->pw_dir, 1);
734 setenv("SHELL",
735 *pwd->pw_shell ? pwd->pw_shell : _PATH_BSHELL, 1);
736 if (clean && chdir(pwd->pw_dir) < 0) {
737 jail_warnx(j, "chdir %s: %s",
738 pwd->pw_dir, strerror(errno));
739 exit(1);
740 }
741 endpwent();
742 }
743
744 if (consfd != 0 && (dup2(consfd, 1) < 0 || dup2(consfd, 2) < 0)) {
745 jail_warnx(j, "exec.consolelog: %s", strerror(errno));
746 exit(1);
747 }
748 closefrom(3);
749 execvp(argv[0], __DECONST(char *const*, argv));
750 jail_warnx(j, "exec %s: %s", argv[0], strerror(errno));
751 exit(1);
752 }
753
754 /*
755 * Add a process to the hash, tied to a jail.
756 */
757 static int
add_proc(struct cfjail * j,pid_t pid)758 add_proc(struct cfjail *j, pid_t pid)
759 {
760 struct kevent ke;
761 struct cfjail *tj;
762 struct phash *ph;
763
764 if (!kq && (kq = kqueue()) < 0)
765 err(1, "kqueue");
766 EV_SET(&ke, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL);
767 if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0) {
768 if (errno == ESRCH)
769 return 0;
770 err(1, "kevent");
771 }
772 ph = emalloc(sizeof(struct phash));
773 ph->j = j;
774 ph->pid = pid;
775 LIST_INSERT_HEAD(&phash[pid % PHASH_SIZE], ph, le);
776 j->nprocs++;
777 j->flags |= JF_SLEEPQ;
778 if (j->timeout.tv_sec == 0)
779 requeue(j, &sleeping);
780 else {
781 /* File the jail in the sleep queue according to its timeout. */
782 TAILQ_REMOVE(j->queue, j, tq);
783 TAILQ_FOREACH(tj, &sleeping, tq) {
784 if (!tj->timeout.tv_sec ||
785 j->timeout.tv_sec < tj->timeout.tv_sec ||
786 (j->timeout.tv_sec == tj->timeout.tv_sec &&
787 j->timeout.tv_nsec <= tj->timeout.tv_nsec)) {
788 TAILQ_INSERT_BEFORE(tj, j, tq);
789 break;
790 }
791 }
792 if (tj == NULL)
793 TAILQ_INSERT_TAIL(&sleeping, j, tq);
794 j->queue = &sleeping;
795 }
796 return 1;
797 }
798
799 /*
800 * Remove any processes from the hash that correspond to a jail.
801 */
802 static void
clear_procs(struct cfjail * j)803 clear_procs(struct cfjail *j)
804 {
805 struct kevent ke;
806 struct phash *ph, *tph;
807 int i;
808
809 j->nprocs = 0;
810 for (i = 0; i < PHASH_SIZE; i++)
811 LIST_FOREACH_SAFE(ph, &phash[i], le, tph)
812 if (ph->j == j) {
813 EV_SET(&ke, ph->pid, EVFILT_PROC, EV_DELETE,
814 NOTE_EXIT, 0, NULL);
815 (void)kevent(kq, &ke, 1, NULL, 0, NULL);
816 LIST_REMOVE(ph, le);
817 free(ph);
818 }
819 }
820
821 /*
822 * Find the jail that corresponds to an exited process.
823 */
824 static struct cfjail *
find_proc(pid_t pid)825 find_proc(pid_t pid)
826 {
827 struct cfjail *j;
828 struct phash *ph;
829
830 LIST_FOREACH(ph, &phash[pid % PHASH_SIZE], le)
831 if (ph->pid == pid) {
832 j = ph->j;
833 LIST_REMOVE(ph, le);
834 free(ph);
835 return --j->nprocs ? NULL : j;
836 }
837 return NULL;
838 }
839
840 /*
841 * Send SIGTERM to all processes in a jail and wait for them to die.
842 */
843 static int
term_procs(struct cfjail * j)844 term_procs(struct cfjail *j)
845 {
846 struct kinfo_proc *ki;
847 int i, noted, pcnt, timeout;
848
849 static kvm_t *kd;
850
851 if (!int_param(j->intparams[IP_STOP_TIMEOUT], &timeout))
852 timeout = DEFAULT_STOP_TIMEOUT;
853 else if (timeout == 0)
854 return 0;
855
856 if (kd == NULL) {
857 kd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL);
858 if (kd == NULL)
859 return 0;
860 }
861
862 ki = kvm_getprocs(kd, KERN_PROC_PROC, 0, &pcnt);
863 if (ki == NULL)
864 return 0;
865 noted = 0;
866 for (i = 0; i < pcnt; i++)
867 if (ki[i].ki_jid == j->jid &&
868 kill(ki[i].ki_pid, SIGTERM) == 0) {
869 (void)add_proc(j, ki[i].ki_pid);
870 if (verbose > 0) {
871 if (!noted) {
872 noted = 1;
873 jail_note(j, "sent SIGTERM to:");
874 }
875 printf(" %d", ki[i].ki_pid);
876 }
877 }
878 if (noted)
879 printf("\n");
880 if (j->nprocs > 0) {
881 clock_gettime(CLOCK_REALTIME, &j->timeout);
882 j->timeout.tv_sec += timeout;
883 return 1;
884 }
885 return 0;
886 }
887
888 /*
889 * Look up a user in the passwd and login.conf files.
890 */
891 static int
get_user_info(struct cfjail * j,const char * username,const struct passwd ** pwdp,login_cap_t ** lcapp)892 get_user_info(struct cfjail *j, const char *username,
893 const struct passwd **pwdp, login_cap_t **lcapp)
894 {
895 const struct passwd *pwd;
896
897 errno = 0;
898 *pwdp = pwd = username ? getpwnam(username) : getpwuid(getuid());
899 if (pwd == NULL) {
900 if (errno)
901 jail_warnx(j, "getpwnam%s%s: %s", username ? " " : "",
902 username ? username : "", strerror(errno));
903 else if (username)
904 jail_warnx(j, "%s: no such user", username);
905 else
906 jail_warnx(j, "unknown uid %d", getuid());
907 return -1;
908 }
909 *lcapp = login_getpwclass(pwd);
910 if (*lcapp == NULL) {
911 jail_warnx(j, "getpwclass %s: %s", pwd->pw_name,
912 strerror(errno));
913 return -1;
914 }
915 /* Set the groups while the group file is still available */
916 if (initgroups(pwd->pw_name, pwd->pw_gid) < 0) {
917 jail_warnx(j, "initgroups %s: %s", pwd->pw_name,
918 strerror(errno));
919 return -1;
920 }
921 return 0;
922 }
923
924 /*
925 * Make sure a mount or consolelog path is a valid absolute pathname
926 * with no symlinks.
927 */
928 static int
check_path(struct cfjail * j,const char * pname,const char * path,int isfile,const char * umount_type)929 check_path(struct cfjail *j, const char *pname, const char *path, int isfile,
930 const char *umount_type)
931 {
932 struct stat st, mpst;
933 struct statfs stfs;
934 char *tpath, *p;
935 const char *jailpath;
936 size_t jplen;
937
938 if (path[0] != '/') {
939 jail_warnx(j, "%s: %s: not an absolute pathname",
940 pname, path);
941 return -1;
942 }
943 /*
944 * Only check for symlinks in components below the jail's path,
945 * since that's where the security risk lies.
946 */
947 jailpath = string_param(j->intparams[KP_PATH]);
948 if (jailpath == NULL)
949 jailpath = "";
950 jplen = strlen(jailpath);
951 if (!strncmp(path, jailpath, jplen) && path[jplen] == '/') {
952 tpath = alloca(strlen(path) + 1);
953 strcpy(tpath, path);
954 for (p = tpath + jplen; p != NULL; ) {
955 p = strchr(p + 1, '/');
956 if (p)
957 *p = '\0';
958 if (lstat(tpath, &st) < 0) {
959 if (errno == ENOENT && isfile && !p)
960 break;
961 jail_warnx(j, "%s: %s: %s", pname, tpath,
962 strerror(errno));
963 return -1;
964 }
965 if (S_ISLNK(st.st_mode)) {
966 jail_warnx(j, "%s: %s is a symbolic link",
967 pname, tpath);
968 return -1;
969 }
970 if (p)
971 *p = '/';
972 }
973 }
974 if (umount_type != NULL) {
975 if (stat(path, &st) < 0 || statfs(path, &stfs) < 0) {
976 jail_warnx(j, "%s: %s: %s", pname, path,
977 strerror(errno));
978 return -1;
979 }
980 if (stat(stfs.f_mntonname, &mpst) < 0) {
981 jail_warnx(j, "%s: %s: %s", pname, stfs.f_mntonname,
982 strerror(errno));
983 return -1;
984 }
985 if (st.st_ino != mpst.st_ino) {
986 jail_warnx(j, "%s: %s: not a mount point",
987 pname, path);
988 return -1;
989 }
990 if (strcmp(stfs.f_fstypename, umount_type)) {
991 jail_warnx(j, "%s: %s: not a %s mount",
992 pname, path, umount_type);
993 return -1;
994 }
995 }
996 return 0;
997 }
998