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 const char **argv;
270 char *acs, *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 argv[0] = _PATH_IFCONFIG;
342 if ((cs = strchr(val, '|'))) {
343 argv[1] = acs = alloca(cs - val + 1);
344 strlcpy(acs, val, cs - val + 1);
345 addr = cs + 1;
346 } else {
347 argv[1] = string_param(j->intparams[IP_INTERFACE]);
348 addr = val;
349 }
350 argv[2] = "inet";
351 if (!(cs = strchr(addr, '/'))) {
352 argv[3] = addr;
353 argv[4] = "netmask";
354 argv[5] = "255.255.255.255";
355 argc = 6;
356 } else if (strchr(cs + 1, '.')) {
357 argv[3] = acs = alloca(cs - addr + 1);
358 strlcpy(acs, addr, cs - addr + 1);
359 argv[4] = "netmask";
360 argv[5] = cs + 1;
361 argc = 6;
362 } else {
363 argv[3] = addr;
364 argc = 4;
365 }
366
367 if (!down) {
368 for (cs = strtok(extrap, " "); cs;
369 cs = strtok(NULL, " ")) {
370 size_t len = strlen(cs) + 1;
371 argv[argc++] = acs = alloca(len);
372 strlcpy(acs, cs, len);
373 }
374 }
375
376 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 argv[0] = _PATH_IFCONFIG;
399 if ((cs = strchr(val, '|'))) {
400 argv[1] = acs = alloca(cs - val + 1);
401 strlcpy(acs, val, cs - val + 1);
402 addr = cs + 1;
403 } else {
404 argv[1] = string_param(j->intparams[IP_INTERFACE]);
405 addr = val;
406 }
407 argv[2] = "inet6";
408 argv[3] = addr;
409 if (!(cs = strchr(addr, '/'))) {
410 argv[4] = "prefixlen";
411 argv[5] = "128";
412 argc = 6;
413 } else
414 argc = 4;
415
416 if (!down) {
417 for (cs = strtok(extrap, " "); cs;
418 cs = strtok(NULL, " ")) {
419 size_t len = strlen(cs) + 1;
420 argv[argc++] = acs = alloca(len);
421 strlcpy(acs, cs, len);
422 }
423 }
424
425 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 argv[0] = _PATH_IFCONFIG;
433 argv[1] = comstring->s;
434 argv[2] = down ? "-vnet" : "vnet";
435 jidstr = string_param(j->intparams[KP_JID]);
436 argv[3] = jidstr ? jidstr : string_param(j->intparams[KP_NAME]);
437 argv[4] = NULL;
438 break;
439
440 case IP_MOUNT:
441 case IP__MOUNT_FROM_FSTAB:
442 argv = alloca(8 * sizeof(char *));
443 comcs = alloca(comstring->len + 1);
444 strcpy(comcs, comstring->s);
445 argc = 0;
446 for (cs = strtok(comcs, " \t\f\v\r\n"); cs && argc < 4;
447 cs = strtok(NULL, " \t\f\v\r\n"))
448 argv[argc++] = cs;
449 if (argc == 0)
450 return 0;
451 if (argc < 3) {
452 jail_warnx(j, "%s: %s: missing information",
453 j->intparams[comparam]->name, comstring->s);
454 return -1;
455 }
456 if (check_path(j, j->intparams[comparam]->name, argv[1], 0,
457 down ? argv[2] : NULL) < 0)
458 return -1;
459 if (down) {
460 argv[4] = NULL;
461 argv[3] = argv[1];
462 argv[0] = "/sbin/umount";
463 } else {
464 if (argc == 4) {
465 argv[7] = NULL;
466 argv[6] = argv[1];
467 argv[5] = argv[0];
468 argv[4] = argv[3];
469 argv[3] = "-o";
470 } else {
471 argv[5] = NULL;
472 argv[4] = argv[1];
473 argv[3] = argv[0];
474 }
475 argv[0] = _PATH_MOUNT;
476 }
477 argv[1] = "-t";
478 break;
479
480 case IP_MOUNT_DEVFS:
481 argv = alloca(7 * sizeof(char *));
482 path = string_param(j->intparams[KP_PATH]);
483 if (path == NULL) {
484 jail_warnx(j, "mount.devfs: no path");
485 return -1;
486 }
487 devpath = alloca(strlen(path) + 5);
488 sprintf(devpath, "%s/dev", path);
489 if (check_path(j, "mount.devfs", devpath, 0,
490 down ? "devfs" : NULL) < 0)
491 return -1;
492 if (down) {
493 argv[0] = "/sbin/umount";
494 argv[1] = devpath;
495 argv[2] = NULL;
496 } else {
497 argv[0] = _PATH_MOUNT;
498 argv[1] = "-t";
499 argv[2] = "devfs";
500 ruleset = string_param(j->intparams[KP_DEVFS_RULESET]);
501 if (!ruleset)
502 ruleset = "4"; /* devfsrules_jail */
503 argv[3] = acs = alloca(11 + strlen(ruleset));
504 sprintf(acs, "-oruleset=%s", ruleset);
505 argv[4] = ".";
506 argv[5] = devpath;
507 argv[6] = NULL;
508 }
509 break;
510
511 case IP_MOUNT_FDESCFS:
512 argv = alloca(7 * sizeof(char *));
513 path = string_param(j->intparams[KP_PATH]);
514 if (path == NULL) {
515 jail_warnx(j, "mount.fdescfs: no path");
516 return -1;
517 }
518 devpath = alloca(strlen(path) + 8);
519 sprintf(devpath, "%s/dev/fd", path);
520 if (check_path(j, "mount.fdescfs", devpath, 0,
521 down ? "fdescfs" : NULL) < 0)
522 return -1;
523 if (down) {
524 argv[0] = "/sbin/umount";
525 argv[1] = devpath;
526 argv[2] = NULL;
527 } else {
528 argv[0] = _PATH_MOUNT;
529 argv[1] = "-t";
530 argv[2] = "fdescfs";
531 argv[3] = ".";
532 argv[4] = devpath;
533 argv[5] = NULL;
534 }
535 break;
536
537 case IP_MOUNT_PROCFS:
538 argv = alloca(7 * sizeof(char *));
539 path = string_param(j->intparams[KP_PATH]);
540 if (path == NULL) {
541 jail_warnx(j, "mount.procfs: no path");
542 return -1;
543 }
544 devpath = alloca(strlen(path) + 6);
545 sprintf(devpath, "%s/proc", path);
546 if (check_path(j, "mount.procfs", devpath, 0,
547 down ? "procfs" : NULL) < 0)
548 return -1;
549 if (down) {
550 argv[0] = "/sbin/umount";
551 argv[1] = devpath;
552 argv[2] = NULL;
553 } else {
554 argv[0] = _PATH_MOUNT;
555 argv[1] = "-t";
556 argv[2] = "procfs";
557 argv[3] = ".";
558 argv[4] = devpath;
559 argv[5] = NULL;
560 }
561 break;
562
563 case IP_COMMAND:
564 if (j->name != NULL)
565 goto default_command;
566 argc = 0;
567 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq)
568 argc++;
569 argv = alloca((argc + 1) * sizeof(char *));
570 argc = 0;
571 TAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq)
572 argv[argc++] = s->s;
573 argv[argc] = NULL;
574 j->comstring = &dummystring;
575 break;
576
577 default:
578 default_command:
579 if ((cs = strpbrk(comstring->s, "!\"$&'()*;<>?[\\]`{|}~")) &&
580 !(cs[0] == '&' && cs[1] == '\0')) {
581 argv = alloca(4 * sizeof(char *));
582 argv[0] = _PATH_BSHELL;
583 argv[1] = "-c";
584 argv[2] = comstring->s;
585 argv[3] = NULL;
586 } else {
587 if (cs) {
588 *cs = 0;
589 bg = 1;
590 }
591 comcs = alloca(comstring->len + 1);
592 strcpy(comcs, comstring->s);
593 argc = 0;
594 for (cs = strtok(comcs, " \t\f\v\r\n"); cs;
595 cs = strtok(NULL, " \t\f\v\r\n"))
596 argc++;
597 argv = alloca((argc + 1) * sizeof(char *));
598 strcpy(comcs, comstring->s);
599 argc = 0;
600 for (cs = strtok(comcs, " \t\f\v\r\n"); cs;
601 cs = strtok(NULL, " \t\f\v\r\n"))
602 argv[argc++] = cs;
603 argv[argc] = NULL;
604 }
605 }
606 if (argv[0] == NULL)
607 return 0;
608
609 if (int_param(j->intparams[IP_EXEC_TIMEOUT], &timeout) &&
610 timeout != 0) {
611 clock_gettime(CLOCK_REALTIME, &j->timeout);
612 j->timeout.tv_sec += timeout;
613 } else
614 j->timeout.tv_sec = 0;
615
616 injail = comparam == IP_EXEC_START || comparam == IP_COMMAND ||
617 comparam == IP_EXEC_STOP;
618 clean = bool_param(j->intparams[IP_EXEC_CLEAN]);
619 username = string_param(j->intparams[injail
620 ? IP_EXEC_JAIL_USER : IP_EXEC_SYSTEM_USER]);
621 sjuser = bool_param(j->intparams[IP_EXEC_SYSTEM_JAIL_USER]);
622
623 consfd = 0;
624 if (injail &&
625 (conslog = string_param(j->intparams[IP_EXEC_CONSOLELOG]))) {
626 if (check_path(j, "exec.consolelog", conslog, 1, NULL) < 0)
627 return -1;
628 consfd =
629 open(conslog, O_WRONLY | O_CREAT | O_APPEND, DEFFILEMODE);
630 if (consfd < 0) {
631 jail_warnx(j, "open %s: %s", conslog, strerror(errno));
632 return -1;
633 }
634 }
635
636 comlen = 0;
637 for (i = 0; argv[i]; i++)
638 comlen += strlen(argv[i]) + 1;
639 j->comline = cs = emalloc(comlen);
640 for (i = 0; argv[i]; i++) {
641 strcpy(cs, argv[i]);
642 if (argv[i + 1]) {
643 cs += strlen(argv[i]) + 1;
644 cs[-1] = ' ';
645 }
646 }
647 if (verbose > 0)
648 jail_note(j, "run command%s%s%s: %s\n",
649 injail ? " in jail" : "", username ? " as " : "",
650 username ? username : "", j->comline);
651
652 pid = fork();
653 if (pid < 0)
654 err(1, "fork");
655 if (pid > 0) {
656 if (bg || !add_proc(j, pid)) {
657 free(j->comline);
658 j->comline = NULL;
659 return 0;
660 } else {
661 paralimit--;
662 return 1;
663 }
664 }
665 if (bg)
666 setsid();
667
668 /* Set up the environment and run the command */
669 pwd = NULL;
670 lcap = NULL;
671 if ((clean || username) && injail && sjuser &&
672 get_user_info(j, username, &pwd, &lcap) < 0)
673 exit(1);
674 if (injail) {
675 /* jail_attach won't chdir along with its chroot. */
676 path = string_param(j->intparams[KP_PATH]);
677 if (path && chdir(path) < 0) {
678 jail_warnx(j, "chdir %s: %s", path, strerror(errno));
679 exit(1);
680 }
681 if (int_param(j->intparams[IP_EXEC_FIB], &fib) &&
682 setfib(fib) < 0) {
683 jail_warnx(j, "setfib: %s", strerror(errno));
684 exit(1);
685 }
686 if (jail_attach(j->jid) < 0) {
687 jail_warnx(j, "jail_attach: %s", strerror(errno));
688 exit(1);
689 }
690 }
691 if (clean || username) {
692 if (!(injail && sjuser) &&
693 get_user_info(j, username, &pwd, &lcap) < 0)
694 exit(1);
695 if (clean) {
696 term = getenv("TERM");
697 environ = &cleanenv;
698 setenv("PATH", "/bin:/usr/bin", 0);
699 if (term != NULL)
700 setenv("TERM", term, 1);
701 }
702 if (setgid(pwd->pw_gid) < 0) {
703 jail_warnx(j, "setgid %d: %s", pwd->pw_gid,
704 strerror(errno));
705 exit(1);
706 }
707 if (setusercontext(lcap, pwd, pwd->pw_uid, username
708 ? LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN
709 : LOGIN_SETPATH | LOGIN_SETENV) < 0) {
710 jail_warnx(j, "setusercontext %s: %s", pwd->pw_name,
711 strerror(errno));
712 exit(1);
713 }
714 login_close(lcap);
715 setenv("USER", pwd->pw_name, 1);
716 setenv("HOME", pwd->pw_dir, 1);
717 setenv("SHELL",
718 *pwd->pw_shell ? pwd->pw_shell : _PATH_BSHELL, 1);
719 if (clean && chdir(pwd->pw_dir) < 0) {
720 jail_warnx(j, "chdir %s: %s",
721 pwd->pw_dir, strerror(errno));
722 exit(1);
723 }
724 endpwent();
725 }
726
727 if (consfd != 0 && (dup2(consfd, 1) < 0 || dup2(consfd, 2) < 0)) {
728 jail_warnx(j, "exec.consolelog: %s", strerror(errno));
729 exit(1);
730 }
731 closefrom(3);
732 execvp(argv[0], __DECONST(char *const*, argv));
733 jail_warnx(j, "exec %s: %s", argv[0], strerror(errno));
734 exit(1);
735 }
736
737 /*
738 * Add a process to the hash, tied to a jail.
739 */
740 static int
add_proc(struct cfjail * j,pid_t pid)741 add_proc(struct cfjail *j, pid_t pid)
742 {
743 struct kevent ke;
744 struct cfjail *tj;
745 struct phash *ph;
746
747 if (!kq && (kq = kqueue()) < 0)
748 err(1, "kqueue");
749 EV_SET(&ke, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL);
750 if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0) {
751 if (errno == ESRCH)
752 return 0;
753 err(1, "kevent");
754 }
755 ph = emalloc(sizeof(struct phash));
756 ph->j = j;
757 ph->pid = pid;
758 LIST_INSERT_HEAD(&phash[pid % PHASH_SIZE], ph, le);
759 j->nprocs++;
760 j->flags |= JF_SLEEPQ;
761 if (j->timeout.tv_sec == 0)
762 requeue(j, &sleeping);
763 else {
764 /* File the jail in the sleep queue according to its timeout. */
765 TAILQ_REMOVE(j->queue, j, tq);
766 TAILQ_FOREACH(tj, &sleeping, tq) {
767 if (!tj->timeout.tv_sec ||
768 j->timeout.tv_sec < tj->timeout.tv_sec ||
769 (j->timeout.tv_sec == tj->timeout.tv_sec &&
770 j->timeout.tv_nsec <= tj->timeout.tv_nsec)) {
771 TAILQ_INSERT_BEFORE(tj, j, tq);
772 break;
773 }
774 }
775 if (tj == NULL)
776 TAILQ_INSERT_TAIL(&sleeping, j, tq);
777 j->queue = &sleeping;
778 }
779 return 1;
780 }
781
782 /*
783 * Remove any processes from the hash that correspond to a jail.
784 */
785 static void
clear_procs(struct cfjail * j)786 clear_procs(struct cfjail *j)
787 {
788 struct kevent ke;
789 struct phash *ph, *tph;
790 int i;
791
792 j->nprocs = 0;
793 for (i = 0; i < PHASH_SIZE; i++)
794 LIST_FOREACH_SAFE(ph, &phash[i], le, tph)
795 if (ph->j == j) {
796 EV_SET(&ke, ph->pid, EVFILT_PROC, EV_DELETE,
797 NOTE_EXIT, 0, NULL);
798 (void)kevent(kq, &ke, 1, NULL, 0, NULL);
799 LIST_REMOVE(ph, le);
800 free(ph);
801 }
802 }
803
804 /*
805 * Find the jail that corresponds to an exited process.
806 */
807 static struct cfjail *
find_proc(pid_t pid)808 find_proc(pid_t pid)
809 {
810 struct cfjail *j;
811 struct phash *ph;
812
813 LIST_FOREACH(ph, &phash[pid % PHASH_SIZE], le)
814 if (ph->pid == pid) {
815 j = ph->j;
816 LIST_REMOVE(ph, le);
817 free(ph);
818 return --j->nprocs ? NULL : j;
819 }
820 return NULL;
821 }
822
823 /*
824 * Send SIGTERM to all processes in a jail and wait for them to die.
825 */
826 static int
term_procs(struct cfjail * j)827 term_procs(struct cfjail *j)
828 {
829 struct kinfo_proc *ki;
830 int i, noted, pcnt, timeout;
831
832 static kvm_t *kd;
833
834 if (!int_param(j->intparams[IP_STOP_TIMEOUT], &timeout))
835 timeout = DEFAULT_STOP_TIMEOUT;
836 else if (timeout == 0)
837 return 0;
838
839 if (kd == NULL) {
840 kd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL);
841 if (kd == NULL)
842 return 0;
843 }
844
845 ki = kvm_getprocs(kd, KERN_PROC_PROC, 0, &pcnt);
846 if (ki == NULL)
847 return 0;
848 noted = 0;
849 for (i = 0; i < pcnt; i++)
850 if (ki[i].ki_jid == j->jid &&
851 kill(ki[i].ki_pid, SIGTERM) == 0) {
852 (void)add_proc(j, ki[i].ki_pid);
853 if (verbose > 0) {
854 if (!noted) {
855 noted = 1;
856 jail_note(j, "sent SIGTERM to:");
857 }
858 printf(" %d", ki[i].ki_pid);
859 }
860 }
861 if (noted)
862 printf("\n");
863 if (j->nprocs > 0) {
864 clock_gettime(CLOCK_REALTIME, &j->timeout);
865 j->timeout.tv_sec += timeout;
866 return 1;
867 }
868 return 0;
869 }
870
871 /*
872 * Look up a user in the passwd and login.conf files.
873 */
874 static int
get_user_info(struct cfjail * j,const char * username,const struct passwd ** pwdp,login_cap_t ** lcapp)875 get_user_info(struct cfjail *j, const char *username,
876 const struct passwd **pwdp, login_cap_t **lcapp)
877 {
878 const struct passwd *pwd;
879
880 *pwdp = pwd = username ? getpwnam(username) : getpwuid(getuid());
881 if (pwd == NULL) {
882 if (errno)
883 jail_warnx(j, "getpwnam%s%s: %s", username ? " " : "",
884 username ? username : "", strerror(errno));
885 else if (username)
886 jail_warnx(j, "%s: no such user", username);
887 else
888 jail_warnx(j, "unknown uid %d", getuid());
889 return -1;
890 }
891 *lcapp = login_getpwclass(pwd);
892 if (*lcapp == NULL) {
893 jail_warnx(j, "getpwclass %s: %s", pwd->pw_name,
894 strerror(errno));
895 return -1;
896 }
897 /* Set the groups while the group file is still available */
898 if (initgroups(pwd->pw_name, pwd->pw_gid) < 0) {
899 jail_warnx(j, "initgroups %s: %s", pwd->pw_name,
900 strerror(errno));
901 return -1;
902 }
903 return 0;
904 }
905
906 /*
907 * Make sure a mount or consolelog path is a valid absolute pathname
908 * with no symlinks.
909 */
910 static int
check_path(struct cfjail * j,const char * pname,const char * path,int isfile,const char * umount_type)911 check_path(struct cfjail *j, const char *pname, const char *path, int isfile,
912 const char *umount_type)
913 {
914 struct stat st, mpst;
915 struct statfs stfs;
916 char *tpath, *p;
917 const char *jailpath;
918 size_t jplen;
919
920 if (path[0] != '/') {
921 jail_warnx(j, "%s: %s: not an absolute pathname",
922 pname, path);
923 return -1;
924 }
925 /*
926 * Only check for symlinks in components below the jail's path,
927 * since that's where the security risk lies.
928 */
929 jailpath = string_param(j->intparams[KP_PATH]);
930 if (jailpath == NULL)
931 jailpath = "";
932 jplen = strlen(jailpath);
933 if (!strncmp(path, jailpath, jplen) && path[jplen] == '/') {
934 tpath = alloca(strlen(path) + 1);
935 strcpy(tpath, path);
936 for (p = tpath + jplen; p != NULL; ) {
937 p = strchr(p + 1, '/');
938 if (p)
939 *p = '\0';
940 if (lstat(tpath, &st) < 0) {
941 if (errno == ENOENT && isfile && !p)
942 break;
943 jail_warnx(j, "%s: %s: %s", pname, tpath,
944 strerror(errno));
945 return -1;
946 }
947 if (S_ISLNK(st.st_mode)) {
948 jail_warnx(j, "%s: %s is a symbolic link",
949 pname, tpath);
950 return -1;
951 }
952 if (p)
953 *p = '/';
954 }
955 }
956 if (umount_type != NULL) {
957 if (stat(path, &st) < 0 || statfs(path, &stfs) < 0) {
958 jail_warnx(j, "%s: %s: %s", pname, path,
959 strerror(errno));
960 return -1;
961 }
962 if (stat(stfs.f_mntonname, &mpst) < 0) {
963 jail_warnx(j, "%s: %s: %s", pname, stfs.f_mntonname,
964 strerror(errno));
965 return -1;
966 }
967 if (st.st_ino != mpst.st_ino) {
968 jail_warnx(j, "%s: %s: not a mount point",
969 pname, path);
970 return -1;
971 }
972 if (strcmp(stfs.f_fstypename, umount_type)) {
973 jail_warnx(j, "%s: %s: not a %s mount",
974 pname, path, umount_type);
975 return -1;
976 }
977 }
978 return 0;
979 }
980