2 * Copyright (c) 1999 Poul-Henning Kamp.
3 * Copyright (c) 2009-2012 James Gritton
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/types.h>
33 #include <sys/socket.h>
34 #include <sys/sysctl.h>
36 #include <arpa/inet.h>
37 #include <netinet/in.h>
49 #define JP_RDTUN(jp) (((jp)->jp_ctltype & CTLFLAG_RDTUN) == CTLFLAG_RDTUN)
62 static void clear_persist(struct cfjail *j);
63 static int update_jail(struct cfjail *j);
64 static int rdtun_params(struct cfjail *j, int dofail);
65 static void running_jid(struct cfjail *j, int dflag);
66 static void jail_quoted_warnx(const struct cfjail *j, const char *name_msg,
67 const char *noname_msg);
68 static int jailparam_set_note(const struct cfjail *j, struct jailparam *jp,
69 unsigned njp, int flags);
70 static void print_jail(FILE *fp, struct cfjail *j, int oldcl);
71 static void print_param(FILE *fp, const struct cfparam *p, int sep, int doname);
72 static void quoted_print(FILE *fp, char *str);
73 static void usage(void);
75 static struct permspec perm_sysctl[] = {
76 { "security.jail.set_hostname_allowed", KP_ALLOW_SET_HOSTNAME, 0 },
77 { "security.jail.sysvipc_allowed", KP_ALLOW_SYSVIPC, 0 },
78 { "security.jail.allow_raw_sockets", KP_ALLOW_RAW_SOCKETS, 0 },
79 { "security.jail.chflags_allowed", KP_ALLOW_CHFLAGS, 0 },
80 { "security.jail.mount_allowed", KP_ALLOW_MOUNT, 0 },
81 { "security.jail.socket_unixiproute_only", KP_ALLOW_SOCKET_AF, 1 },
84 static const enum intparam startcommands[] = {
105 static const enum intparam stopcommands[] = {
114 IP__MOUNT_FROM_FSTAB,
126 main(int argc, char **argv)
134 int ch, docf, error, i, oldcl, sysval;
136 char enforce_statfs[4];
137 #if defined(INET) || defined(INET6)
140 #if defined(INET) && defined(INET6)
141 struct in6_addr addr6;
150 while ((ch = getopt(argc, argv, "cdf:hiJ:lmn:p:qrRs:u:U:v")) != -1) {
162 #if defined(INET) || defined(INET6)
163 add_param(NULL, NULL, IP_IP_HOSTNAME, NULL);
175 add_param(NULL, NULL, IP_EXEC_CLEAN, NULL);
182 add_param(NULL, NULL, KP_NAME, optarg);
186 paralimit = strtol(optarg, NULL, 10);
201 add_param(NULL, NULL, KP_SECURELEVEL, optarg);
205 add_param(NULL, NULL, IP_EXEC_JAIL_USER, optarg);
206 add_param(NULL, NULL, IP_EXEC_SYSTEM_JAIL_USER, NULL);
210 add_param(NULL, NULL, IP_EXEC_JAIL_USER, optarg);
211 add_param(NULL, NULL, IP_EXEC_SYSTEM_JAIL_USER,
225 /* Find out which of the four command line styles this is. */
228 /* Old-style command line with four fixed parameters */
229 if (argc < 4 || argv[0][0] != '/')
234 add_param(NULL, NULL, KP_PATH, argv[0]);
235 add_param(NULL, NULL, KP_HOST_HOSTNAME, argv[1]);
236 #if defined(INET) || defined(INET6)
237 if (argv[2][0] != '\0') {
238 for (cs = argv[2];; cs = ncs + 1) {
239 ncs = strchr(cs, ',');
242 add_param(NULL, NULL,
243 #if defined(INET) && defined(INET6)
244 inet_pton(AF_INET6, cs, &addr6) == 1
245 ? KP_IP6_ADDR : KP_IP4_ADDR,
257 for (i = 3; i < argc; i++)
258 add_param(NULL, NULL, IP_COMMAND, argv[i]);
259 /* Emulate the defaults from security.jail.* sysctls. */
260 sysvallen = sizeof(sysval);
261 if (sysctlbyname("security.jail.jailed", &sysval, &sysvallen,
262 NULL, 0) == 0 && sysval == 0) {
263 for (pi = 0; pi < sizeof(perm_sysctl) /
264 sizeof(perm_sysctl[0]); pi++) {
265 sysvallen = sizeof(sysval);
266 if (sysctlbyname(perm_sysctl[pi].name,
267 &sysval, &sysvallen, NULL, 0) == 0)
268 add_param(NULL, NULL,
269 perm_sysctl[pi].ipnum,
274 sysvallen = sizeof(sysval);
275 if (sysctlbyname("security.jail.enforce_statfs",
276 &sysval, &sysvallen, NULL, 0) == 0) {
277 snprintf(enforce_statfs,
278 sizeof(enforce_statfs), "%d", sysval);
279 add_param(NULL, NULL, KP_ENFORCE_STATFS,
283 } else if (op == JF_STOP) {
284 /* Jail remove, perhaps using the config file */
285 if (!docf || argc == 0)
288 for (i = 0; i < argc; i++)
289 if (strchr(argv[i], '='))
291 if ((docf = !Rflag &&
292 (!strcmp(cfname, "-") || stat(cfname, &st) == 0)))
294 note_remove = docf || argc > 1 || wild_jail_name(argv[0]);
295 } else if (argc > 1 || (argc == 1 && strchr(argv[0], '='))) {
296 /* Single jail specified on the command line */
300 for (i = 0; i < argc; i++) {
301 if (!strncmp(argv[i], "command", 7) &&
302 (argv[i][7] == '\0' || argv[i][7] == '=')) {
303 if (argv[i][7] == '=')
304 add_param(NULL, NULL, IP_COMMAND,
306 for (i++; i < argc; i++)
307 add_param(NULL, NULL, IP_COMMAND,
311 else if (!strncmp(argv[i], "ip4.addr=", 9)) {
312 for (cs = argv[i] + 9;; cs = ncs + 1) {
313 ncs = strchr(cs, ',');
316 add_param(NULL, NULL, KP_IP4_ADDR, cs);
323 else if (!strncmp(argv[i], "ip6.addr=", 9)) {
324 for (cs = argv[i] + 9;; cs = ncs + 1) {
325 ncs = strchr(cs, ',');
328 add_param(NULL, NULL, KP_IP6_ADDR, cs);
335 add_param(NULL, NULL, 0, argv[i]);
338 /* From the config file, perhaps with a specified jail */
344 /* Find out which jails will be run. */
348 for (i = 0; i < argc; i++)
349 if (start_state(argv[i], docf, op, Rflag) < 0)
352 if (start_state(argv[0], docf, op, 0) < 0)
357 if (JidFile != NULL) {
358 jfp = fopen(JidFile, "w");
360 err(1, "open %s", JidFile);
366 * The main loop: Get an available jail and perform the required
367 * operation on it. When that is done, the jail may be finished,
368 * or it may go back for the next step.
370 while ((j = next_jail()))
372 if (j->flags & JF_FAILED) {
374 if (j->comparam == NULL) {
379 if (!(j->flags & JF_PARAMS))
381 j->flags |= JF_PARAMS;
383 add_param(j, NULL, IP_ALLOW_DYING, NULL);
384 if (check_intparams(j) < 0)
386 if ((j->flags & (JF_START | JF_SET)) &&
387 import_params(j) < 0)
392 (j->flags & (JF_SET | JF_DEPEND)) == JF_SET
393 ? dflag || bool_param(j->intparams[IP_ALLOW_DYING])
395 if (finish_command(j))
398 switch (j->flags & JF_OP_MASK) {
400 * These operations just turn into a different op
401 * depending on the jail's current status.
404 j->flags = j->jid < 0 ? JF_START : JF_SET;
408 jail_quoted_warnx(j, "not found",
409 "no jail specified");
413 j->flags = rdtun_params(j, 0) ? JF_RESTART : JF_SET;
414 if (j->flags == JF_RESTART)
417 case JF_START_SET_RESTART:
418 j->flags = j->jid < 0 ? JF_START
419 : rdtun_params(j, 0) ? JF_RESTART : JF_SET;
420 if (j->flags == JF_RESTART)
424 switch (j->flags & JF_OP_MASK) {
426 if (j->comparam == NULL) {
428 !(j->flags & (JF_DEPEND | JF_WILD))) {
429 jail_quoted_warnx(j, "already exists",
437 goto jail_create_done;
438 j->comparam = startcommands;
446 print_jail(jfp, j, oldcl);
451 if (j->jid < 0 && !(j->flags & JF_DEPEND)) {
452 jail_quoted_warnx(j, "not found",
453 "no jail specified");
459 if (!(j->flags & JF_DEPEND)) {
460 if (rdtun_params(j, 1) < 0 ||
463 if (verbose >= 0 && (j->name || verbose > 0))
464 jail_note(j, "updated\n");
471 if (j->comparam == NULL) {
475 if (!(j->flags & (JF_DEPEND|JF_WILD))) {
481 goto jail_remove_done;
483 j->comparam = stopcommands;
485 } else if ((j->flags & JF_FAILED) && j->jid > 0)
486 goto jail_remove_done;
491 if ((j->flags & (JF_START | JF_FAILED)) == JF_START) {
493 j->flags &= ~JF_STOP;
495 requeue(j, j->ndeps ? &depend : &ready);
507 * Mark a jail's failure for future handling.
510 failed(struct cfjail *j)
512 j->flags |= JF_FAILED;
513 TAILQ_REMOVE(j->queue, j, tq);
514 TAILQ_INSERT_HEAD(&ready, j, tq);
519 * Exit slightly more gracefully when out of memory.
533 erealloc(void *ptr, size_t size)
537 p = realloc(ptr, size);
544 estrdup(const char *str)
555 * Print a message including an optional jail name.
558 jail_note(const struct cfjail *j, const char *fmt, ...)
566 len = vsnprintf(NULL, 0, fmt, tap);
568 cs = alloca(len + 1);
569 (void)vsnprintf(cs, len + 1, fmt, ap);
572 printf("%s: %s", j->name, cs);
578 * Print a warning message including an optional jail name.
581 jail_warnx(const struct cfjail *j, const char *fmt, ...)
589 len = vsnprintf(NULL, 0, fmt, tap);
591 cs = alloca(len + 1);
592 (void)vsnprintf(cs, len + 1, fmt, ap);
595 warnx("%s: %s", j->name, cs);
604 create_jail(struct cfjail *j)
606 struct iovec jiov[4];
608 struct jailparam *jp, *setparams, *setparams2, *sjp;
610 int dopersist, ns, jid, dying, didfail;
613 * Check the jail's path, with a better error message than jail_set
616 if ((path = string_param(j->intparams[KP_PATH]))) {
617 if (j->name != NULL && path[0] != '/') {
618 jail_warnx(j, "path %s: not an absolute pathname",
622 if (stat(path, &st) < 0) {
623 jail_warnx(j, "path %s: %s", path, strerror(errno));
626 if (!S_ISDIR(st.st_mode)) {
627 jail_warnx(j, "path %s: %s", path, strerror(ENOTDIR));
633 * Copy all the parameters, except that "persist" is always set when
634 * there are commands to run later.
636 dopersist = !bool_param(j->intparams[KP_PERSIST]) &&
637 (j->intparams[IP_EXEC_START] || j->intparams[IP_COMMAND] ||
638 j->intparams[IP_EXEC_POSTSTART]);
640 alloca((j->njp + dopersist) * sizeof(struct jailparam));
641 if (dopersist && jailparam_init(sjp++, "persist") < 0) {
642 jail_warnx(j, "%s", jail_errmsg);
645 for (jp = j->jp; jp < j->jp + j->njp; jp++)
646 if (!dopersist || !equalopts(jp->jp_name, "persist"))
648 ns = sjp - setparams;
651 j->jid = jailparam_set_note(j, setparams, ns, JAIL_CREATE);
652 if (j->jid < 0 && errno == EEXIST &&
653 bool_param(j->intparams[IP_ALLOW_DYING]) &&
654 int_param(j->intparams[KP_JID], &jid) && jid != 0) {
656 * The jail already exists, but may be dying.
657 * Make sure it is, in which case an update is appropriate.
659 *(const void **)&jiov[0].iov_base = "jid";
660 jiov[0].iov_len = sizeof("jid");
661 jiov[1].iov_base = &jid;
662 jiov[1].iov_len = sizeof(jid);
663 *(const void **)&jiov[2].iov_base = "dying";
664 jiov[2].iov_len = sizeof("dying");
665 jiov[3].iov_base = &dying;
666 jiov[3].iov_len = sizeof(dying);
667 if (jail_get(jiov, 4, JAIL_DYING) < 0) {
669 * It could be that the jail just barely finished
670 * dying, or it could be that the jid never existed
671 * but the name does. In either case, another try
672 * at creating the jail should do the right thing.
675 j->jid = jailparam_set_note(j, setparams, ns,
679 if (rdtun_params(j, 1) < 0) {
683 sjp = setparams2 = alloca((j->njp + dopersist) *
684 sizeof(struct jailparam));
685 for (jp = setparams; jp < setparams + ns; jp++)
687 !strcmp(jp->jp_name, "jid"))
689 j->jid = jailparam_set_note(j, setparams2,
690 sjp - setparams2, JAIL_UPDATE | JAIL_DYING);
692 * Again, perhaps the jail just finished dying.
694 if (j->jid < 0 && errno == ENOENT)
695 j->jid = jailparam_set_note(j,
696 setparams, ns, JAIL_CREATE);
700 if (j->jid < 0 && !didfail) {
701 jail_warnx(j, "%s", jail_errmsg);
705 jailparam_free(setparams, 1);
707 j->flags |= JF_PERSIST;
713 * Remove a temporarily set "persist" parameter.
716 clear_persist(struct cfjail *j)
718 struct iovec jiov[4];
721 if (!(j->flags & JF_PERSIST))
723 j->flags &= ~JF_PERSIST;
724 *(const void **)&jiov[0].iov_base = "jid";
725 jiov[0].iov_len = sizeof("jid");
726 jiov[1].iov_base = &j->jid;
727 jiov[1].iov_len = sizeof(j->jid);
728 *(const void **)&jiov[2].iov_base = "nopersist";
729 jiov[2].iov_len = sizeof("nopersist");
730 jiov[3].iov_base = NULL;
732 jid = jail_set(jiov, 4, JAIL_UPDATE);
734 jail_note(j, "jail_set(JAIL_UPDATE) jid=%d nopersist%s%s\n",
735 j->jid, jid < 0 ? ": " : "",
736 jid < 0 ? strerror(errno) : "");
740 * Set a jail's parameters.
743 update_jail(struct cfjail *j)
745 struct jailparam *jp, *setparams, *sjp;
749 for (jp = j->jp; jp < j->jp + j->njp; jp++)
754 sjp = setparams = alloca(++ns * sizeof(struct jailparam));
755 if (jailparam_init(sjp, "jid") < 0 ||
756 jailparam_import_raw(sjp, &j->jid, sizeof j->jid) < 0) {
757 jail_warnx(j, "%s", jail_errmsg);
761 for (jp = j->jp; jp < j->jp + j->njp; jp++)
765 jid = jailparam_set_note(j, setparams, ns,
766 bool_param(j->intparams[IP_ALLOW_DYING])
767 ? JAIL_UPDATE | JAIL_DYING : JAIL_UPDATE);
769 jail_warnx(j, "%s", jail_errmsg);
772 jailparam_free(setparams, 1);
777 * Return if a jail set would change any create-only parameters.
780 rdtun_params(struct cfjail *j, int dofail)
782 struct jailparam *jp, *rtparams, *rtjp;
785 if (j->flags & JF_RDTUN)
787 j->flags |= JF_RDTUN;
789 for (jp = j->jp; jp < j->jp + j->njp; jp++)
790 if (JP_RDTUN(jp) && strcmp(jp->jp_name, "jid"))
794 rtjp = rtparams = alloca(++nrt * sizeof(struct jailparam));
795 if (jailparam_init(rtjp, "jid") < 0 ||
796 jailparam_import_raw(rtjp, &j->jid, sizeof j->jid) < 0) {
797 jail_warnx(j, "%s", jail_errmsg);
800 for (jp = j->jp; jp < j->jp + j->njp; jp++)
801 if (JP_RDTUN(jp) && strcmp(jp->jp_name, "jid"))
804 if (jailparam_get(rtparams, nrt,
805 bool_param(j->intparams[IP_ALLOW_DYING]) ? JAIL_DYING : 0) > 0) {
807 for (jp = j->jp, rtjp = rtparams + 1; rtjp < rtparams + nrt;
809 if (JP_RDTUN(jp) && strcmp(jp->jp_name, "jid")) {
810 if (!((jp->jp_flags & (JP_BOOL | JP_NOBOOL)) &&
811 jp->jp_valuelen == 0 &&
812 *(int *)jp->jp_value) &&
813 !(rtjp->jp_valuelen == jp->jp_valuelen &&
814 !memcmp(rtjp->jp_value, jp->jp_value,
817 jail_warnx(j, "%s cannot be "
818 "changed after creation",
830 for (rtjp = rtparams + 1; rtjp < rtparams + nrt; rtjp++)
831 rtjp->jp_name = NULL;
832 jailparam_free(rtparams, nrt);
837 * Get the jail's jid if it is running.
840 running_jid(struct cfjail *j, int dflag)
842 struct iovec jiov[2];
847 if ((pval = string_param(j->intparams[KP_JID]))) {
848 if (!(jid = strtol(pval, &ep, 10)) || *ep) {
852 *(const void **)&jiov[0].iov_base = "jid";
853 jiov[0].iov_len = sizeof("jid");
854 jiov[1].iov_base = &jid;
855 jiov[1].iov_len = sizeof(jid);
856 } else if ((pval = string_param(j->intparams[KP_NAME]))) {
857 *(const void **)&jiov[0].iov_base = "name";
858 jiov[0].iov_len = sizeof("name");
859 jiov[1].iov_len = strlen(pval) + 1;
860 jiov[1].iov_base = alloca(jiov[1].iov_len);
861 strcpy(jiov[1].iov_base, pval);
866 j->jid = jail_get(jiov, 2, dflag ? JAIL_DYING : 0);
870 jail_quoted_warnx(const struct cfjail *j, const char *name_msg,
871 const char *noname_msg)
875 if ((pval = j->name) || (pval = string_param(j->intparams[KP_JID])) ||
876 (pval = string_param(j->intparams[KP_NAME])))
877 warnx("\"%s\" %s", pval, name_msg);
879 warnx("%s", noname_msg);
883 * Set jail parameters and possible print them out.
886 jailparam_set_note(const struct cfjail *j, struct jailparam *jp, unsigned njp,
893 jid = jailparam_set(jp, njp, flags);
895 jail_note(j, "jail_set(%s%s)",
896 (flags & (JAIL_CREATE | JAIL_UPDATE)) == JAIL_CREATE
897 ? "JAIL_CREATE" : "JAIL_UPDATE",
898 (flags & JAIL_DYING) ? " | JAIL_DYING" : "");
899 for (i = 0; i < njp; i++) {
900 printf(" %s", jp[i].jp_name);
901 if (jp[i].jp_value == NULL)
904 value = jailparam_export(jp + i);
906 err(1, "jailparam_export");
907 quoted_print(stdout, value);
911 printf(": %s", strerror(errno));
918 * Print a jail record.
921 print_jail(FILE *fp, struct cfjail *j, int oldcl)
926 fprintf(fp, "%d\t", j->jid);
927 print_param(fp, j->intparams[KP_PATH], ',', 0);
929 print_param(fp, j->intparams[KP_HOST_HOSTNAME], ',', 0);
932 print_param(fp, j->intparams[KP_IP4_ADDR], ',', 0);
934 if (j->intparams[KP_IP4_ADDR] &&
935 !TAILQ_EMPTY(&j->intparams[KP_IP4_ADDR]->val) &&
936 j->intparams[KP_IP6_ADDR] &&
937 !TAILQ_EMPTY(&j->intparams[KP_IP6_ADDR]->val))
942 print_param(fp, j->intparams[KP_IP6_ADDR], ',', 0);
945 print_param(fp, j->intparams[IP_COMMAND], ' ', 0);
947 fprintf(fp, "jid=%d", j->jid);
948 TAILQ_FOREACH(p, &j->params, tq)
949 if (strcmp(p->name, "jid")) {
951 print_param(fp, p, ',', 1);
958 * Print a parameter value, or a name=value pair.
961 print_param(FILE *fp, const struct cfparam *p, int sep, int doname)
963 const struct cfstring *s, *ts;
967 if (p == NULL || TAILQ_EMPTY(&p->val))
971 TAILQ_FOREACH_SAFE(s, &p->val, tq, ts) {
972 quoted_print(fp, s->s);
979 * Print a string with quotes around spaces.
982 quoted_print(FILE *fp, char *str)
988 : strchr(p, '\'') ? '"'
989 : strchr(p, '"') ? '\''
990 : strchr(p, ' ') || strchr(p, '\t') ? '"'
995 if (c == '\\' || c == qc)
1007 (void)fprintf(stderr,
1008 "usage: jail [-dhilqv] [-J jid_file] [-u username] [-U username]\n"
1009 " -[cmr] param=value ... [command=command ...]\n"
1010 " jail [-dqv] [-f file] -[cmr] [jail]\n"
1011 " jail [-qv] [-f file] -[rR] ['*' | jail ...]\n"
1012 " jail [-dhilqv] [-J jid_file] [-u username] [-U username]\n"
1013 " [-n jailname] [-s securelevel]\n"
1014 " path hostname [ip[,...]] command ...\n");