2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1999 Poul-Henning Kamp.
5 * Copyright (c) 2008 Bjoern A. Zeeb.
6 * Copyright (c) 2009 James Gritton.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
36 #include "opt_inet6.h"
38 #include <sys/param.h>
39 #include <sys/types.h>
40 #include <sys/kernel.h>
41 #include <sys/systm.h>
42 #include <sys/errno.h>
43 #include <sys/sysproto.h>
44 #include <sys/malloc.h>
48 #include <sys/epoch.h>
49 #include <sys/taskqueue.h>
50 #include <sys/fcntl.h>
52 #include <sys/linker.h>
55 #include <sys/mutex.h>
56 #include <sys/racct.h>
58 #include <sys/refcount.h>
60 #include <sys/sysent.h>
61 #include <sys/namei.h>
62 #include <sys/mount.h>
63 #include <sys/queue.h>
64 #include <sys/socket.h>
65 #include <sys/syscallsubr.h>
66 #include <sys/sysctl.h>
68 #include <sys/vnode.h>
73 #include <netinet/in.h>
79 #include <security/mac/mac_framework.h>
81 #define PRISON0_HOSTUUID_MODULE "hostuuid"
83 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
84 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures");
86 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */
89 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
91 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
95 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
97 #define _PR_IP_SADDRSEL 0
101 /* prison0 describes what is "real" about the system. */
102 struct prison prison0 = {
108 .pr_securelevel = -1,
110 .pr_state = PRISON_STATE_ALIVE,
111 .pr_childmax = JAIL_MAX,
112 .pr_hostuuid = DEFAULT_HOSTUUID,
113 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
115 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
117 .pr_flags = PR_HOST|_PR_IP_SADDRSEL,
119 .pr_allow = PR_ALLOW_ALL_STATIC,
121 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
128 struct jailsys_flags {
134 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */
135 struct sx allprison_lock;
136 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
137 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
138 LIST_HEAD(, prison_racct) allprison_racct;
141 static int get_next_prid(struct prison **insprp);
142 static int do_jail_attach(struct thread *td, struct prison *pr, int drflags);
143 static void prison_complete(void *context, int pending);
144 static void prison_deref(struct prison *pr, int flags);
145 static void prison_deref_kill(struct prison *pr, struct prisonlist *freeprison);
146 static int prison_lock_xlock(struct prison *pr, int flags);
147 static void prison_cleanup(struct prison *pr);
148 static void prison_free_not_last(struct prison *pr);
149 static void prison_proc_free_not_last(struct prison *pr);
150 static void prison_proc_relink(struct prison *opr, struct prison *npr,
152 static void prison_set_allow_locked(struct prison *pr, unsigned flag,
154 static char *prison_path(struct prison *pr1, struct prison *pr2);
156 static void prison_racct_attach(struct prison *pr);
157 static void prison_racct_modify(struct prison *pr);
158 static void prison_racct_detach(struct prison *pr);
161 /* Flags for prison_deref */
162 #define PD_DEREF 0x01 /* Decrement pr_ref */
163 #define PD_DEUREF 0x02 /* Decrement pr_uref */
164 #define PD_KILL 0x04 /* Remove jail, kill processes, etc */
165 #define PD_LOCKED 0x10 /* pr_mtx is held */
166 #define PD_LIST_SLOCKED 0x20 /* allprison_lock is held shared */
167 #define PD_LIST_XLOCKED 0x40 /* allprison_lock is held exclusive */
168 #define PD_OP_FLAGS 0x07 /* Operation flags */
169 #define PD_LOCK_FLAGS 0x70 /* Lock status flags */
172 * Parameter names corresponding to PR_* flag values. Size values are for kvm
173 * as we cannot figure out the size of a sparse array, or an array without a
176 static struct bool_flags pr_flag_bool[] = {
177 {"persist", "nopersist", PR_PERSIST},
179 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL},
182 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL},
185 const size_t pr_flag_bool_size = sizeof(pr_flag_bool);
187 static struct jailsys_flags pr_flag_jailsys[] = {
188 {"host", 0, PR_HOST},
190 {"vnet", 0, PR_VNET},
193 {"ip4", PR_IP4_USER, PR_IP4_USER},
196 {"ip6", PR_IP6_USER, PR_IP6_USER},
199 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
202 * Make this array full-size so dynamic parameters can be added.
203 * It is protected by prison0.mtx, but lockless reading is allowed
204 * with an atomic check of the flag values.
206 static struct bool_flags pr_flag_allow[NBBY * NBPW] = {
207 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME},
208 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC},
209 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS},
210 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS},
211 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT},
212 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS},
213 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF},
214 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK},
215 {"allow.reserved_ports", "allow.noreserved_ports",
216 PR_ALLOW_RESERVED_PORTS},
217 {"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF},
218 {"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug",
219 PR_ALLOW_UNPRIV_DEBUG},
220 {"allow.suser", "allow.nosuser", PR_ALLOW_SUSER},
222 static unsigned pr_allow_all = PR_ALLOW_ALL_STATIC;
223 const size_t pr_flag_allow_size = sizeof(pr_flag_allow);
225 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \
226 PR_ALLOW_RESERVED_PORTS | \
227 PR_ALLOW_UNPRIV_DEBUG | \
229 #define JAIL_DEFAULT_ENFORCE_STATFS 2
230 #define JAIL_DEFAULT_DEVFS_RSNUM 0
231 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
232 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
233 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
234 #if defined(INET) || defined(INET6)
235 static unsigned jail_max_af_ips = 255;
239 * Initialize the parts of prison0 that can't be static-initialized with
240 * constants. This is called from proc0_init() after creating thread0 cpuset.
245 uint8_t *file, *data;
247 char buf[sizeof(prison0.pr_hostuuid)];
250 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset);
251 prison0.pr_osreldate = osreldate;
252 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease));
254 /* If we have a preloaded hostuuid, use it. */
255 file = preload_search_by_type(PRISON0_HOSTUUID_MODULE);
257 data = preload_fetch_addr(file);
258 size = preload_fetch_size(file);
261 * The preloaded data may include trailing whitespace, almost
262 * certainly a newline; skip over any whitespace or
263 * non-printable characters to be safe.
265 while (size > 0 && data[size - 1] <= 0x20) {
272 * Not NUL-terminated when passed from loader, but
273 * validate_uuid requires that due to using sscanf (as
274 * does the subsequent strlcpy, since it still reads
275 * past the given size to return the true length);
276 * bounce to a temporary buffer to fix.
278 if (size >= sizeof(buf))
281 memcpy(buf, data, size);
284 if (validate_uuid(buf, size, NULL, 0) != 0)
288 (void)strlcpy(prison0.pr_hostuuid, buf,
289 sizeof(prison0.pr_hostuuid));
292 if (bootverbose && !valid) {
293 printf("hostuuid: preload data malformed: '%.*s'\n",
299 printf("hostuuid: using %s\n", prison0.pr_hostuuid);
308 sys_jail(struct thread *td, struct jail_args *uap)
314 error = copyin(uap->jail, &version, sizeof(uint32_t));
323 /* FreeBSD single IPv4 jails. */
324 bzero(&j, sizeof(struct jail));
325 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
328 j.version = j0.version;
330 j.hostname = j0.hostname;
331 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */
337 * Version 1 was used by multi-IPv4 jail implementations
338 * that never made it into the official kernel.
342 case 2: /* JAIL_API_VERSION */
343 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
344 error = copyin(uap->jail, &j, sizeof(struct jail));
350 /* Sci-Fi jails are not supported, sorry. */
353 return (kern_jail(td, &j));
357 kern_jail(struct thread *td, struct jail *j)
359 struct iovec optiov[2 * (4 + nitems(pr_flag_allow)
368 char *u_path, *u_hostname, *u_name;
369 struct bool_flags *bf;
372 struct in_addr *u_ip4;
375 struct in6_addr *u_ip6;
378 int error, enforce_statfs;
380 bzero(&optiov, sizeof(optiov));
381 opt.uio_iov = optiov;
385 opt.uio_segflg = UIO_SYSSPACE;
386 opt.uio_rw = UIO_READ;
389 /* Set permissions for top-level jails from sysctls. */
390 if (!jailed(td->td_ucred)) {
391 for (bf = pr_flag_allow;
392 bf < pr_flag_allow + nitems(pr_flag_allow) &&
393 atomic_load_int(&bf->flag) != 0;
395 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *,
396 (jail_default_allow & bf->flag)
397 ? bf->name : bf->noname);
398 optiov[opt.uio_iovcnt].iov_len =
399 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
402 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
403 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
405 enforce_statfs = jail_default_enforce_statfs;
406 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
407 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
411 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
413 ip4s = (j->version == 0) ? 1 : j->ip4s;
414 if (ip4s > jail_max_af_ips)
416 tmplen += ip4s * sizeof(struct in_addr);
422 if (j->ip6s > jail_max_af_ips)
424 tmplen += j->ip6s * sizeof(struct in6_addr);
429 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
430 u_hostname = u_path + MAXPATHLEN;
431 u_name = u_hostname + MAXHOSTNAMELEN;
433 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
437 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
439 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
442 optiov[opt.uio_iovcnt].iov_base = "path";
443 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
445 optiov[opt.uio_iovcnt].iov_base = u_path;
446 error = copyinstr(j->path, u_path, MAXPATHLEN,
447 &optiov[opt.uio_iovcnt].iov_len);
449 free(u_path, M_TEMP);
453 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
454 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
456 optiov[opt.uio_iovcnt].iov_base = u_hostname;
457 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
458 &optiov[opt.uio_iovcnt].iov_len);
460 free(u_path, M_TEMP);
464 if (j->jailname != NULL) {
465 optiov[opt.uio_iovcnt].iov_base = "name";
466 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
468 optiov[opt.uio_iovcnt].iov_base = u_name;
469 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
470 &optiov[opt.uio_iovcnt].iov_len);
472 free(u_path, M_TEMP);
478 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
479 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
481 optiov[opt.uio_iovcnt].iov_base = u_ip4;
482 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
484 u_ip4->s_addr = j->ip4s;
486 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
488 free(u_path, M_TEMP);
495 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
496 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
498 optiov[opt.uio_iovcnt].iov_base = u_ip6;
499 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
500 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
502 free(u_path, M_TEMP);
507 KASSERT(opt.uio_iovcnt <= nitems(optiov),
508 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
509 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
510 free(u_path, M_TEMP);
515 * struct jail_set_args {
516 * struct iovec *iovp;
517 * unsigned int iovcnt;
522 sys_jail_set(struct thread *td, struct jail_set_args *uap)
527 /* Check that we have an even number of iovecs. */
531 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
534 error = kern_jail_set(td, auio, uap->flags);
539 #if defined(INET) || defined(INET6)
540 typedef int prison_addr_cmp_t(const void *, const void *);
541 typedef bool prison_addr_valid_t(const void *);
542 static const struct pr_family {
544 prison_addr_cmp_t *cmp;
545 prison_addr_valid_t *valid;
547 } pr_families[PR_FAMILY_MAX] = {
550 .size = sizeof(struct in_addr),
551 .cmp = prison_qcmp_v4,
552 .valid = prison_valid_v4,
553 .ip_flag = PR_IP4_USER,
558 .size = sizeof(struct in6_addr),
559 .cmp = prison_qcmp_v6,
560 .valid = prison_valid_v6,
561 .ip_flag = PR_IP6_USER,
567 * Network address lists (pr_addrs) allocation for jails. The addresses
568 * are accessed locklessly by the network stack, thus need to be protected by
572 struct epoch_context ctx;
576 struct in_addr pr_ip4[];
577 struct in6_addr pr_ip6[];
579 #else /* No future C :( */
580 #define PR_IP(pip, i) ((const char *)((pip) + 1) + pr_families[af].size * (i))
581 #define PR_IPD(pip, i) ((char *)((pip) + 1) + pr_families[af].size * (i))
585 static struct prison_ip *
586 prison_ip_alloc(const pr_family_t af, uint32_t cnt, int flags)
588 struct prison_ip *pip;
590 pip = malloc(sizeof(struct prison_ip) + cnt * pr_families[af].size,
598 * Allocate and copyin user supplied address list, sorting and validating.
599 * kern_jail_set() helper.
601 static struct prison_ip *
602 prison_ip_copyin(const pr_family_t af, void *op, uint32_t cnt)
604 prison_addr_cmp_t *const cmp = pr_families[af].cmp;
605 const size_t size = pr_families[af].size;
606 struct prison_ip *pip;
608 pip = prison_ip_alloc(af, cnt, M_WAITOK);
609 bcopy(op, pip + 1, cnt * size);
611 * IP addresses are all sorted but ip[0] to preserve
612 * the primary IP address as given from userland.
613 * This special IP is used for unbound outgoing
614 * connections as well for "loopback" traffic in case
615 * source address selection cannot find any more fitting
616 * address to connect from.
619 qsort((char *)(pip + 1) + size, cnt - 1, size,
620 pr_families[af].cmp);
622 * Check for duplicate addresses and do some simple
623 * zero and broadcast checks. If users give other bogus
624 * addresses it is their problem.
626 for (int i = 0; i < cnt; i++) {
627 if (!pr_families[af].valid(PR_IP(pip, i))) {
632 (cmp(PR_IP(pip, 0), PR_IP(pip, i + 1)) == 0 ||
633 cmp(PR_IP(pip, i), PR_IP(pip, i + 1)) == 0)) {
643 * Allocate and dup parent prison address list.
644 * kern_jail_set() helper.
647 prison_ip_dup(struct prison *ppr, struct prison *pr, const pr_family_t af)
650 if (ppr->pr_addrs[af] != NULL) {
651 pr->pr_addrs[af] = prison_ip_alloc(af,
652 ppr->pr_addrs[af]->ips, M_WAITOK);
653 bcopy(ppr->pr_addrs[af], pr->pr_addrs[af],
654 pr->pr_addrs[af]->ips * pr_families[af].size);
659 * Make sure the new set of IP addresses is a subset of the parent's list.
660 * Don't worry about the parent being unlocked, as any setting is done with
661 * allprison_lock held.
662 * kern_jail_set() helper.
665 prison_ip_parent_match(const struct prison_ip *ppip,
666 const struct prison_ip *pip, const pr_family_t af)
668 prison_addr_cmp_t *const cmp = pr_families[af].cmp;
674 for (i = 0; i < ppip->ips; i++)
675 if (cmp(PR_IP(pip, 0), PR_IP(ppip, i)) == 0)
679 /* Main address not present in parent. */
683 for (i = j = 1; i < pip->ips; i++) {
684 if (cmp(PR_IP(pip, i), PR_IP(ppip, 0)) == 0)
685 /* Equals to parent primary address. */
687 for (; j < ppip->ips; j++)
688 if (cmp(PR_IP(pip, i), PR_IP(ppip, j)) == 0)
694 /* Address not present in parent. */
701 * Check for conflicting IP addresses. We permit them if there is no more
702 * than one IP on each jail. If there is a duplicate on a jail with more
703 * than one IP stop checking and return error.
704 * kern_jail_set() helper.
707 prison_ip_conflict_check(const struct prison *ppr, const struct prison *pr,
708 const struct prison_ip *pip, pr_family_t af)
710 const struct prison *tppr, *tpr;
714 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent)
715 if (tppr->pr_flags & PR_VNET)
720 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
723 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
725 !prison_isalive(tpr)) {
729 if (!(tpr->pr_flags & pr_families[af].ip_flag))
732 if (tpr->pr_addrs[af] == NULL ||
733 (pip->ips == 1 && tpr->pr_addrs[af]->ips == 1))
735 for (int i = 0; i < pip->ips; i++)
736 if (prison_ip_check(tpr, af, PR_IP(pip, i)) == 0)
743 _Static_assert(offsetof(struct prison_ip, ctx) == 0,
744 "prison must start with epoch context");
746 prison_ip_free_deferred(epoch_context_t ctx)
753 prison_ip_free(struct prison_ip *pip)
757 NET_EPOCH_CALL(prison_ip_free_deferred, &pip->ctx);
761 prison_ip_set(struct prison *pr, const pr_family_t af, struct prison_ip *new)
763 struct prison_ip **mem, *old;
765 mtx_assert(&pr->pr_mtx, MA_OWNED);
767 mem = &pr->pr_addrs[af];
770 ck_pr_store_ptr(mem, new);
775 * Restrict a prison's IP address list with its parent's, possibly replacing
776 * it. Return true if the replacement buffer was used (or would have been).
777 * kern_jail_set() helper.
780 prison_ip_restrict(struct prison *pr, const pr_family_t af,
781 struct prison_ip *new)
783 const struct prison_ip *ppip = pr->pr_parent->pr_addrs[af];
784 const struct prison_ip *pip = pr->pr_addrs[af];
785 int (*const cmp)(const void *, const void *) = pr_families[af].cmp;
786 const size_t size = pr_families[af].size;
790 mtx_assert(&pr->pr_mtx, MA_OWNED);
793 * Due to epoch-synchronized access to the IP address lists we always
794 * allocate a new list even if the old one has enough space. We could
795 * atomically update an IPv4 address inside a list, but that would
796 * screw up sorting, and in case of IPv6 we can't even atomically write
799 ips = (pr->pr_flags & pr_families[af].ip_flag) ? pip->ips : ppip->ips;
801 prison_ip_set(pr, af, NULL);
805 new = prison_ip_alloc(af, ips, M_NOWAIT);
811 if (!(pr->pr_flags & pr_families[af].ip_flag)) {
812 /* This has no user settings, so just copy the parent's list. */
813 bcopy(ppip, new, ips * size);
815 /* Remove addresses that aren't in the parent. */
818 i = 0; /* index in pip */
819 ips = 0; /* index in new */
821 for (int pi = 0; pi < ppip->ips; pi++)
822 if (cmp(PR_IP(pip, 0), PR_IP(ppip, pi)) == 0) {
823 /* Found our primary address in parent. */
824 bcopy(PR_IP(pip, i), PR_IPD(new, ips), size);
829 for (int pi = 1; i < pip->ips; ) {
830 /* Check against primary, which is unsorted. */
831 if (cmp(PR_IP(pip, i), PR_IP(ppip, 0)) == 0) {
832 /* Matches parent's primary address. */
833 bcopy(PR_IP(pip, i), PR_IPD(new, ips), size);
838 /* The rest are sorted. */
839 switch (pi >= ppip->ips ? -1 :
840 cmp(PR_IP(pip, i), PR_IP(ppip, pi))) {
845 bcopy(PR_IP(pr, i), PR_IPD(new, ips), size);
861 prison_ip_set(pr, af, new);
862 return (new != NULL ? true : false);
866 * Fast-path check if an address belongs to a prison.
869 prison_ip_check(const struct prison *pr, const pr_family_t af,
872 int (*const cmp)(const void *, const void *) = pr_families[af].cmp;
873 const struct prison_ip *pip;
876 MPASS(mtx_owned(&pr->pr_mtx) ||
877 in_epoch(net_epoch_preempt) ||
878 sx_xlocked(&allprison_lock));
880 pip = ck_pr_load_ptr(&pr->pr_addrs[af]);
881 if (__predict_false(pip == NULL))
882 return (EAFNOSUPPORT);
884 /* Check the primary IP. */
885 if (cmp(PR_IP(pip, 0), addr) == 0)
889 * All the other IPs are sorted so we can do a binary search.
895 d = cmp(PR_IP(pip, i + 1), addr);
904 return (EADDRNOTAVAIL);
908 * Grab primary IP. Historically required mutex, but nothing prevents
909 * us to support epoch-protected access. Is it used in fast path?
910 * in{6}_jail.c helper
913 prison_ip_get0(const struct prison *pr, const pr_family_t af)
915 const struct prison_ip *pip = pr->pr_addrs[af];
917 mtx_assert(&pr->pr_mtx, MA_OWNED);
924 prison_ip_cnt(const struct prison *pr, const pr_family_t af)
927 return (pr->pr_addrs[af]->ips);
929 #endif /* defined(INET) || defined(INET6) */
932 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
936 struct prison_ip *ip4;
939 struct prison_ip *ip6;
942 struct vfsoptlist *opts;
943 struct prison *pr, *deadpr, *inspr, *mypr, *ppr, *tpr;
945 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
946 char *g_path, *osrelstr;
947 struct bool_flags *bf;
948 struct jailsys_flags *jsf;
949 #if defined(INET) || defined(INET6)
953 size_t namelen, onamelen, pnamelen;
954 int born, created, cuflags, descend, drflags, enforce;
955 int error, errmsg_len, errmsg_pos;
956 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
957 int jid, jsys, len, level;
958 int childmax, osreldt, rsnum, slevel;
965 uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
966 uint64_t pr_allow_diff;
970 error = priv_check(td, PRIV_JAIL_SET);
971 if (!error && (flags & JAIL_ATTACH))
972 error = priv_check(td, PRIV_JAIL_ATTACH);
975 mypr = td->td_ucred->cr_prison;
976 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
978 if (flags & ~JAIL_SET_MASK)
982 * Check all the parameters before committing to anything. Not all
983 * errors can be caught early, but we may as well try. Also, this
984 * takes care of some expensive stuff (path lookup) before getting
985 * the allprison lock.
987 * XXX Jails are not filesystems, and jail parameters are not mount
988 * options. But it makes more sense to re-use the vfsopt code
989 * than duplicate it under a different name.
991 error = vfs_buildopts(optuio, &opts);
1002 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
1005 vfs_opterror(opts, "no valid operation (create or update)");
1009 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
1010 if (error == ENOENT)
1012 else if (error != 0)
1015 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
1016 if (error == ENOENT)
1018 else if (error != 0)
1024 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
1025 if (error == ENOENT)
1027 else if (error != 0)
1032 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
1033 if (error == ENOENT)
1035 else if (error != 0)
1037 else if (enforce < 0 || enforce > 2) {
1043 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
1044 if (error == ENOENT)
1046 else if (error != 0)
1051 pr_flags = ch_flags = 0;
1052 for (bf = pr_flag_bool;
1053 bf < pr_flag_bool + nitems(pr_flag_bool);
1055 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag);
1056 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag);
1058 ch_flags |= pr_flags;
1059 for (jsf = pr_flag_jailsys;
1060 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
1062 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys));
1063 if (error == ENOENT)
1068 case JAIL_SYS_DISABLE:
1069 if (!jsf->disable) {
1073 pr_flags |= jsf->disable;
1076 pr_flags |= jsf->new;
1078 case JAIL_SYS_INHERIT:
1084 ch_flags |= jsf->new | jsf->disable;
1086 if ((flags & (JAIL_CREATE | JAIL_ATTACH)) == JAIL_CREATE
1087 && !(pr_flags & PR_PERSIST)) {
1089 vfs_opterror(opts, "new jail must persist or attach");
1093 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
1095 vfs_opterror(opts, "vnet cannot be changed after creation");
1100 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
1102 vfs_opterror(opts, "ip4 cannot be changed after creation");
1107 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
1109 vfs_opterror(opts, "ip6 cannot be changed after creation");
1114 pr_allow = ch_allow = 0;
1115 for (bf = pr_flag_allow;
1116 bf < pr_flag_allow + nitems(pr_flag_allow) &&
1117 atomic_load_int(&bf->flag) != 0;
1119 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag);
1120 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag);
1122 ch_allow |= pr_allow;
1124 error = vfs_getopt(opts, "name", (void **)&name, &len);
1125 if (error == ENOENT)
1127 else if (error != 0)
1130 if (len == 0 || name[len - 1] != '\0') {
1134 if (len > MAXHOSTNAMELEN) {
1135 error = ENAMETOOLONG;
1140 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
1141 if (error == ENOENT)
1143 else if (error != 0)
1146 ch_flags |= PR_HOST;
1147 pr_flags |= PR_HOST;
1148 if (len == 0 || host[len - 1] != '\0') {
1152 if (len > MAXHOSTNAMELEN) {
1153 error = ENAMETOOLONG;
1158 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
1159 if (error == ENOENT)
1161 else if (error != 0)
1164 ch_flags |= PR_HOST;
1165 pr_flags |= PR_HOST;
1166 if (len == 0 || domain[len - 1] != '\0') {
1170 if (len > MAXHOSTNAMELEN) {
1171 error = ENAMETOOLONG;
1176 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
1177 if (error == ENOENT)
1179 else if (error != 0)
1182 ch_flags |= PR_HOST;
1183 pr_flags |= PR_HOST;
1184 if (len == 0 || uuid[len - 1] != '\0') {
1188 if (len > HOSTUUIDLEN) {
1189 error = ENAMETOOLONG;
1194 #ifdef COMPAT_FREEBSD32
1195 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
1198 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
1202 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
1203 if (error == ENOENT)
1205 else if (error != 0)
1209 ch_flags |= PR_HOST;
1210 pr_flags |= PR_HOST;
1214 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
1215 if (error == ENOENT)
1217 else if (error != 0)
1219 else if (ip4s & (sizeof(struct in_addr) - 1)) {
1223 ch_flags |= PR_IP4_USER;
1224 pr_flags |= PR_IP4_USER;
1226 ip4s /= sizeof(struct in_addr);
1227 if (ip4s > jail_max_af_ips) {
1229 vfs_opterror(opts, "too many IPv4 addresses");
1232 ip4 = prison_ip_copyin(PR_INET, op, ip4s);
1242 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
1243 if (error == ENOENT)
1245 else if (error != 0)
1247 else if (ip6s & (sizeof(struct in6_addr) - 1)) {
1251 ch_flags |= PR_IP6_USER;
1252 pr_flags |= PR_IP6_USER;
1254 ip6s /= sizeof(struct in6_addr);
1255 if (ip6s > jail_max_af_ips) {
1257 vfs_opterror(opts, "too many IPv6 addresses");
1260 ip6 = prison_ip_copyin(PR_INET6, op, ip6s);
1269 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1270 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1273 "vnet jails cannot have IP address restrictions");
1278 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len);
1279 if (error == ENOENT)
1281 else if (error != 0)
1284 if (flags & JAIL_UPDATE) {
1287 "osrelease cannot be changed after creation");
1290 if (len == 0 || osrelstr[len - 1] != '\0') {
1294 if (len >= OSRELEASELEN) {
1295 error = ENAMETOOLONG;
1297 "osrelease string must be 1-%d bytes long",
1303 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt));
1304 if (error == ENOENT)
1306 else if (error != 0)
1309 if (flags & JAIL_UPDATE) {
1312 "osreldate cannot be changed after creation");
1317 vfs_opterror(opts, "osreldate cannot be 0");
1323 error = vfs_getopt(opts, "path", (void **)&path, &len);
1324 if (error == ENOENT)
1326 else if (error != 0)
1329 if (flags & JAIL_UPDATE) {
1332 "path cannot be changed after creation");
1335 if (len == 0 || path[len - 1] != '\0') {
1339 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path);
1345 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1346 strlcpy(g_path, path, MAXPATHLEN);
1347 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
1351 /* exit on other errors */
1354 if (root->v_type != VDIR) {
1363 * Find the specified jail, or at least its parent.
1364 * This abuses the file error codes ENOENT and EEXIST.
1368 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
1369 namelc = strrchr(name, '.');
1370 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
1374 sx_xlock(&allprison_lock);
1375 drflags = PD_LIST_XLOCKED;
1377 if (!prison_isalive(ppr)) {
1378 /* This jail is dying. This process will surely follow. */
1385 vfs_opterror(opts, "negative jid");
1389 * See if a requested jid already exists. Keep track of
1390 * where it can be inserted later.
1392 TAILQ_FOREACH(inspr, &allprison, pr_list) {
1393 if (inspr->pr_id < jid)
1395 if (inspr->pr_id > jid)
1398 mtx_lock(&pr->pr_mtx);
1399 drflags |= PD_LOCKED;
1404 /* Create: jid must not exist. */
1405 if (cuflags == JAIL_CREATE) {
1407 * Even creators that cannot see the jail will
1411 vfs_opterror(opts, "jail %d already exists",
1415 if (!prison_ischild(mypr, pr)) {
1417 * Updaters get ENOENT if they cannot see the
1418 * jail. This is true even for CREATE | UPDATE,
1419 * which normally cannot give this error.
1422 vfs_opterror(opts, "jail %d not found", jid);
1425 ppr = pr->pr_parent;
1426 if (!prison_isalive(ppr)) {
1428 vfs_opterror(opts, "jail %d is dying",
1432 if (!prison_isalive(pr)) {
1433 if (!(flags & JAIL_DYING)) {
1435 vfs_opterror(opts, "jail %d is dying",
1439 if ((flags & JAIL_ATTACH) ||
1440 (pr_flags & PR_PERSIST)) {
1442 * A dying jail might be resurrected
1443 * (via attach or persist), but first
1444 * it must determine if another jail
1445 * has claimed its name. Accomplish
1446 * this by implicitly re-setting the
1450 name = prison_name(mypr, pr);
1454 /* Update: jid must exist. */
1455 if (cuflags == JAIL_UPDATE) {
1457 vfs_opterror(opts, "jail %d not found", jid);
1463 * If the caller provided a name, look for a jail by that name.
1464 * This has different semantics for creates and updates keyed by jid
1465 * (where the name must not already exist in a different jail),
1466 * and updates keyed by the name itself (where the name must exist
1467 * because that is the jail being updated).
1471 namelc = strrchr(name, '.');
1476 * This is a hierarchical name. Split it into the
1477 * parent and child names, and make sure the parent
1478 * exists or matches an already found jail.
1481 if (strncmp(name, ppr->pr_name, namelc - name)
1482 || ppr->pr_name[namelc - name] != '\0') {
1485 "cannot change jail's parent");
1490 ppr = prison_find_name(mypr, name);
1494 "jail \"%s\" not found", name);
1497 mtx_unlock(&ppr->pr_mtx);
1498 if (!prison_isalive(ppr)) {
1501 "jail \"%s\" is dying", name);
1508 if (namelc[0] != '\0') {
1510 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1512 FOREACH_PRISON_CHILD(ppr, tpr) {
1514 !strcmp(tpr->pr_name + pnamelen, namelc)) {
1515 if (prison_isalive(tpr)) {
1517 cuflags != JAIL_CREATE) {
1523 mtx_lock(&pr->pr_mtx);
1524 drflags |= PD_LOCKED;
1528 * Create, or update(jid):
1529 * name must not exist in an
1530 * active sibling jail.
1534 "jail \"%s\" already exists",
1539 cuflags != JAIL_CREATE) {
1544 /* If no active jail is found, use a dying one. */
1545 if (deadpr != NULL && pr == NULL) {
1546 if (flags & JAIL_DYING) {
1548 mtx_lock(&pr->pr_mtx);
1549 drflags |= PD_LOCKED;
1550 } else if (cuflags == JAIL_UPDATE) {
1553 "jail \"%s\" is dying", name);
1557 /* Update: name must exist if no jid. */
1558 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1560 vfs_opterror(opts, "jail \"%s\" not found",
1566 /* Update: must provide a jid or name. */
1567 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1569 vfs_opterror(opts, "update specified no jail");
1573 /* If there's no prison to update, create a new one and link it in. */
1574 created = pr == NULL;
1576 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1577 if (tpr->pr_childcount >= tpr->pr_childmax) {
1579 vfs_opterror(opts, "prison limit exceeded");
1582 if (jid == 0 && (jid = get_next_prid(&inspr)) == 0) {
1584 vfs_opterror(opts, "no available jail IDs");
1588 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1589 pr->pr_state = PRISON_STATE_INVALID;
1590 refcount_init(&pr->pr_ref, 1);
1591 refcount_init(&pr->pr_uref, 0);
1592 drflags |= PD_DEREF;
1593 LIST_INIT(&pr->pr_children);
1594 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1595 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
1599 TAILQ_INSERT_BEFORE(inspr, pr, pr_list);
1601 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1603 pr->pr_parent = ppr;
1605 prison_proc_hold(ppr);
1606 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1607 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1608 tpr->pr_childcount++;
1610 /* Set some default values, and inherit some from the parent. */
1615 root = mypr->pr_root;
1618 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1619 pr->pr_flags |= PR_HOST;
1620 #if defined(INET) || defined(INET6)
1622 if (!(pr_flags & PR_VNET))
1626 if (!(ch_flags & PR_IP4_USER))
1627 pr->pr_flags |= PR_IP4 | PR_IP4_USER;
1628 else if (!(pr_flags & PR_IP4_USER)) {
1629 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1630 prison_ip_dup(ppr, pr, PR_INET);
1634 if (!(ch_flags & PR_IP6_USER))
1635 pr->pr_flags |= PR_IP6 | PR_IP6_USER;
1636 else if (!(pr_flags & PR_IP6_USER)) {
1637 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1638 prison_ip_dup(ppr, pr, PR_INET6);
1643 /* Source address selection is always on by default. */
1644 pr->pr_flags |= _PR_IP_SADDRSEL;
1646 pr->pr_securelevel = ppr->pr_securelevel;
1647 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1648 pr->pr_enforce_statfs = jail_default_enforce_statfs;
1649 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
1651 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate;
1652 if (osrelstr == NULL)
1653 strlcpy(pr->pr_osrelease, ppr->pr_osrelease,
1654 sizeof(pr->pr_osrelease));
1656 strlcpy(pr->pr_osrelease, osrelstr,
1657 sizeof(pr->pr_osrelease));
1660 /* Allocate a new vnet if specified. */
1661 pr->pr_vnet = (pr_flags & PR_VNET)
1662 ? vnet_alloc() : ppr->pr_vnet;
1665 * Allocate a dedicated cpuset for each jail.
1666 * Unlike other initial settings, this may return an error.
1668 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1672 mtx_lock(&pr->pr_mtx);
1673 drflags |= PD_LOCKED;
1676 * Grab a reference for existing prisons, to ensure they
1677 * continue to exist for the duration of the call.
1680 drflags |= PD_DEREF;
1681 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1682 if ((pr->pr_flags & PR_VNET) &&
1683 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1686 "vnet jails cannot have IP address restrictions");
1691 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1694 "ip4 cannot be changed after creation");
1699 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1702 "ip6 cannot be changed after creation");
1708 /* Do final error checking before setting anything. */
1710 if (slevel < ppr->pr_securelevel) {
1716 if (childmax >= ppr->pr_childmax) {
1722 if (enforce < ppr->pr_enforce_statfs) {
1729 * devfs_rsnum is a uint16_t
1731 if (rsnum < 0 || rsnum > 65535) {
1736 * Nested jails always inherit parent's devfs ruleset
1738 if (jailed(td->td_ucred)) {
1739 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
1743 rsnum = ppr->pr_devfs_rsnum;
1748 if ((ppr->pr_flags & PR_IP4) &&
1749 !prison_ip_parent_match(ppr->pr_addrs[PR_INET], ip4,
1754 if (!prison_ip_conflict_check(ppr, pr, ip4, PR_INET)) {
1756 vfs_opterror(opts, "IPv4 addresses clash");
1763 if ((ppr->pr_flags & PR_IP6) &&
1764 !prison_ip_parent_match(ppr->pr_addrs[PR_INET6], ip6,
1769 if (!prison_ip_conflict_check(ppr, pr, ip6, PR_INET6)) {
1771 vfs_opterror(opts, "IPv6 addresses clash");
1776 onamelen = namelen = 0;
1777 if (namelc != NULL) {
1778 /* Give a default name of the jid. Also allow the name to be
1779 * explicitly the jid - but not any other number, and only in
1780 * normal form (no leading zero/etc).
1782 if (namelc[0] == '\0')
1783 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid);
1784 else if ((strtoul(namelc, &p, 10) != jid ||
1785 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') {
1788 "name cannot be numeric (unless it is the jid)");
1792 * Make sure the name isn't too long for the prison or its
1795 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1796 onamelen = strlen(pr->pr_name + pnamelen);
1797 namelen = strlen(namelc);
1798 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) {
1799 error = ENAMETOOLONG;
1802 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1803 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
1804 sizeof(pr->pr_name)) {
1805 error = ENAMETOOLONG;
1810 pr_allow_diff = pr_allow & ~ppr->pr_allow;
1811 if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) {
1817 * Let modules check their parameters. This requires unlocking and
1818 * then re-locking the prison, but this is still a valid state as long
1819 * as allprison_lock remains xlocked.
1821 mtx_unlock(&pr->pr_mtx);
1822 drflags &= ~PD_LOCKED;
1823 error = osd_jail_call(pr, PR_METHOD_CHECK, opts);
1826 mtx_lock(&pr->pr_mtx);
1827 drflags |= PD_LOCKED;
1829 /* At this point, all valid parameters should have been noted. */
1830 TAILQ_FOREACH(opt, opts, link) {
1831 if (!opt->seen && strcmp(opt->name, "errmsg")) {
1833 vfs_opterror(opts, "unknown parameter: %s", opt->name);
1838 /* Set the parameters of the prison. */
1841 if (pr_flags & PR_IP4_USER) {
1842 pr->pr_flags |= PR_IP4;
1843 prison_ip_set(pr, PR_INET, ip4);
1845 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1847 if (tpr->pr_flags & PR_VNET) {
1852 if (prison_ip_restrict(tpr, PR_INET, NULL)) {
1861 if (pr_flags & PR_IP6_USER) {
1862 pr->pr_flags |= PR_IP6;
1863 prison_ip_set(pr, PR_INET6, ip6);
1865 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1867 if (tpr->pr_flags & PR_VNET) {
1872 if (prison_ip_restrict(tpr, PR_INET6, NULL)) {
1880 pr->pr_securelevel = slevel;
1881 /* Set all child jails to be at least this level. */
1882 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1883 if (tpr->pr_securelevel < slevel)
1884 tpr->pr_securelevel = slevel;
1887 pr->pr_childmax = childmax;
1888 /* Set all child jails to under this limit. */
1889 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
1890 if (tpr->pr_childmax > childmax - level)
1891 tpr->pr_childmax = childmax > level
1892 ? childmax - level : 0;
1895 pr->pr_enforce_statfs = enforce;
1896 /* Pass this restriction on to the children. */
1897 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1898 if (tpr->pr_enforce_statfs < enforce)
1899 tpr->pr_enforce_statfs = enforce;
1902 pr->pr_devfs_rsnum = rsnum;
1903 /* Pass this restriction on to the children. */
1904 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1905 tpr->pr_devfs_rsnum = rsnum;
1907 if (namelc != NULL) {
1908 if (ppr == &prison0)
1909 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name));
1911 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
1912 ppr->pr_name, namelc);
1913 /* Change this component of child names. */
1914 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1915 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
1916 strlen(tpr->pr_name + onamelen) + 1);
1917 bcopy(pr->pr_name, tpr->pr_name, namelen);
1921 /* Try to keep a real-rooted full pathname. */
1922 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
1926 if (PR_HOST & ch_flags & ~pr_flags) {
1927 if (pr->pr_flags & PR_HOST) {
1929 * Copy the parent's host info. As with pr_ip4 above,
1930 * the lack of a lock on the parent is not a problem;
1931 * it is always set with allprison_lock at least
1932 * shared, and is held exclusively here.
1934 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
1935 sizeof(pr->pr_hostname));
1936 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
1937 sizeof(pr->pr_domainname));
1938 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
1939 sizeof(pr->pr_hostuuid));
1940 pr->pr_hostid = pr->pr_parent->pr_hostid;
1942 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
1943 /* Set this prison, and any descendants without PR_HOST. */
1945 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
1947 strlcpy(pr->pr_domainname, domain,
1948 sizeof(pr->pr_domainname));
1950 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
1952 pr->pr_hostid = hid;
1953 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1954 if (tpr->pr_flags & PR_HOST)
1958 strlcpy(tpr->pr_hostname,
1960 sizeof(tpr->pr_hostname));
1962 strlcpy(tpr->pr_domainname,
1964 sizeof(tpr->pr_domainname));
1966 strlcpy(tpr->pr_hostuuid,
1968 sizeof(tpr->pr_hostuuid));
1970 tpr->pr_hostid = hid;
1974 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
1975 if ((tallow = ch_allow & ~pr_allow))
1976 prison_set_allow_locked(pr, tallow, 0);
1978 * Persistent prisons get an extra reference, and prisons losing their
1979 * persist flag lose that reference.
1981 born = !prison_isalive(pr);
1982 if (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags)) {
1983 if (pr_flags & PR_PERSIST) {
1986 * This may make a dead prison alive again, but wait
1987 * to label it as such until after OSD calls have had
1988 * a chance to run (and perhaps to fail).
1990 refcount_acquire(&pr->pr_uref);
1992 drflags |= PD_DEUREF;
1993 prison_free_not_last(pr);
1996 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
1997 mtx_unlock(&pr->pr_mtx);
1998 drflags &= ~PD_LOCKED;
2000 * Any errors past this point will need to de-persist newly created
2001 * prisons, as well as call remove methods.
2007 if (racct_enable && created)
2008 prison_racct_attach(pr);
2011 /* Locks may have prevented a complete restriction of child IP
2012 * addresses. If so, allocate some more memory and try again.
2016 ip4s = pr->pr_addrs[PR_INET]->ips;
2017 ip4 = prison_ip_alloc(PR_INET, ip4s, M_WAITOK);
2018 mtx_lock(&pr->pr_mtx);
2020 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2022 if (tpr->pr_flags & PR_VNET) {
2027 if (prison_ip_restrict(tpr, PR_INET, ip4)) {
2034 mtx_unlock(&pr->pr_mtx);
2039 ip6s = pr->pr_addrs[PR_INET6]->ips;
2040 ip6 = prison_ip_alloc(PR_INET6, ip6s, M_WAITOK);
2041 mtx_lock(&pr->pr_mtx);
2043 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2045 if (tpr->pr_flags & PR_VNET) {
2050 if (prison_ip_restrict(tpr, PR_INET6, ip6)) {
2057 mtx_unlock(&pr->pr_mtx);
2061 /* Let the modules do their work. */
2063 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
2067 error = osd_jail_call(pr, PR_METHOD_SET, opts);
2072 * A new prison is now ready to be seen; either it has gained a user
2073 * reference via persistence, or is about to gain one via attachment.
2076 drflags = prison_lock_xlock(pr, drflags);
2077 pr->pr_state = PRISON_STATE_ALIVE;
2080 /* Attach this process to the prison if requested. */
2081 if (flags & JAIL_ATTACH) {
2082 error = do_jail_attach(td, pr,
2083 prison_lock_xlock(pr, drflags & PD_LOCK_FLAGS));
2084 drflags &= ~(PD_LOCKED | PD_LIST_XLOCKED);
2086 vfs_opterror(opts, "attach failed");
2092 if (racct_enable && !created) {
2093 if (drflags & PD_LOCKED) {
2094 mtx_unlock(&pr->pr_mtx);
2095 drflags &= ~PD_LOCKED;
2097 if (drflags & PD_LIST_XLOCKED) {
2098 sx_xunlock(&allprison_lock);
2099 drflags &= ~PD_LIST_XLOCKED;
2101 prison_racct_modify(pr);
2105 drflags &= ~PD_KILL;
2106 td->td_retval[0] = pr->pr_id;
2109 /* Release any temporary prison holds and/or locks. */
2111 prison_deref(pr, drflags);
2112 else if (drflags & PD_LIST_SLOCKED)
2113 sx_sunlock(&allprison_lock);
2114 else if (drflags & PD_LIST_XLOCKED)
2115 sx_xunlock(&allprison_lock);
2120 /* Write the error message back to userspace. */
2121 if (vfs_getopt(opts, "errmsg", (void **)&errmsg,
2122 &errmsg_len) == 0 && errmsg_len > 0) {
2123 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
2124 if (optuio->uio_segflg == UIO_SYSSPACE)
2126 optuio->uio_iov[errmsg_pos].iov_base,
2130 optuio->uio_iov[errmsg_pos].iov_base,
2136 prison_ip_free(ip4);
2139 prison_ip_free(ip6);
2142 free(g_path, M_TEMP);
2148 * Find the next available prison ID. Return the ID on success, or zero
2149 * on failure. Also set a pointer to the allprison list entry the prison
2150 * should be inserted before.
2153 get_next_prid(struct prison **insprp)
2155 struct prison *inspr;
2158 jid = lastprid % JAIL_MAX + 1;
2159 if (TAILQ_EMPTY(&allprison) ||
2160 TAILQ_LAST(&allprison, prisonlist)->pr_id < jid) {
2162 * A common case is for all jails to be implicitly numbered,
2163 * which means they'll go on the end of the list, at least
2164 * for the first JAIL_MAX times.
2169 * Take two passes through the allprison list: first starting
2170 * with the proposed jid, then ending with it.
2172 for (maxid = JAIL_MAX; maxid != 0; ) {
2173 TAILQ_FOREACH(inspr, &allprison, pr_list) {
2174 if (inspr->pr_id < jid)
2176 if (inspr->pr_id > jid) {
2177 /* Found an opening. */
2181 if (++jid > maxid) {
2182 if (lastprid == maxid || lastprid == 0)
2185 * The entire legal range
2186 * has been traversed
2190 /* Try again from the start. */
2196 if (inspr == NULL) {
2197 /* Found room at the end of the list. */
2208 * struct jail_get_args {
2209 * struct iovec *iovp;
2210 * unsigned int iovcnt;
2215 sys_jail_get(struct thread *td, struct jail_get_args *uap)
2220 /* Check that we have an even number of iovecs. */
2221 if (uap->iovcnt & 1)
2224 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
2227 error = kern_jail_get(td, auio, uap->flags);
2229 error = copyout(auio->uio_iov, uap->iovp,
2230 uap->iovcnt * sizeof (struct iovec));
2236 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
2238 struct bool_flags *bf;
2239 struct jailsys_flags *jsf;
2240 struct prison *pr, *mypr;
2242 struct vfsoptlist *opts;
2243 char *errmsg, *name;
2244 int drflags, error, errmsg_len, errmsg_pos, i, jid, len, pos;
2247 if (flags & ~JAIL_GET_MASK)
2250 /* Get the parameter list. */
2251 error = vfs_buildopts(optuio, &opts);
2254 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
2255 mypr = td->td_ucred->cr_prison;
2259 * Find the prison specified by one of: lastjid, jid, name.
2261 sx_slock(&allprison_lock);
2262 drflags = PD_LIST_SLOCKED;
2263 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
2265 TAILQ_FOREACH(pr, &allprison, pr_list) {
2266 if (pr->pr_id > jid &&
2267 ((flags & JAIL_DYING) || prison_isalive(pr)) &&
2268 prison_ischild(mypr, pr)) {
2269 mtx_lock(&pr->pr_mtx);
2270 drflags |= PD_LOCKED;
2275 vfs_opterror(opts, "no jail after %d", jid);
2277 } else if (error != ENOENT)
2280 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
2283 pr = prison_find_child(mypr, jid);
2285 drflags |= PD_LOCKED;
2286 if (!(prison_isalive(pr) ||
2287 (flags & JAIL_DYING))) {
2289 vfs_opterror(opts, "jail %d is dying",
2296 vfs_opterror(opts, "jail %d not found", jid);
2299 } else if (error != ENOENT)
2302 error = vfs_getopt(opts, "name", (void **)&name, &len);
2304 if (len == 0 || name[len - 1] != '\0') {
2308 pr = prison_find_name(mypr, name);
2310 drflags |= PD_LOCKED;
2311 if (!(prison_isalive(pr) || (flags & JAIL_DYING))) {
2313 vfs_opterror(opts, "jail \"%s\" is dying",
2320 vfs_opterror(opts, "jail \"%s\" not found", name);
2322 } else if (error != ENOENT)
2325 vfs_opterror(opts, "no jail specified");
2330 /* Get the parameters of the prison. */
2332 drflags |= PD_DEREF;
2333 td->td_retval[0] = pr->pr_id;
2334 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
2335 if (error != 0 && error != ENOENT)
2337 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
2338 error = vfs_setopt(opts, "parent", &i, sizeof(i));
2339 if (error != 0 && error != ENOENT)
2341 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
2342 if (error != 0 && error != ENOENT)
2344 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
2345 sizeof(pr->pr_cpuset->cs_id));
2346 if (error != 0 && error != ENOENT)
2348 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
2349 if (error != 0 && error != ENOENT)
2352 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_addrs[PR_INET] + 1,
2353 pr->pr_addrs[PR_INET] ? pr->pr_addrs[PR_INET]->ips *
2354 pr_families[PR_INET].size : 0 );
2355 if (error != 0 && error != ENOENT)
2359 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_addrs[PR_INET6] + 1,
2360 pr->pr_addrs[PR_INET6] ? pr->pr_addrs[PR_INET6]->ips *
2361 pr_families[PR_INET6].size : 0 );
2362 if (error != 0 && error != ENOENT)
2365 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
2366 sizeof(pr->pr_securelevel));
2367 if (error != 0 && error != ENOENT)
2369 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
2370 sizeof(pr->pr_childcount));
2371 if (error != 0 && error != ENOENT)
2373 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
2374 sizeof(pr->pr_childmax));
2375 if (error != 0 && error != ENOENT)
2377 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
2378 if (error != 0 && error != ENOENT)
2380 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
2381 if (error != 0 && error != ENOENT)
2383 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
2384 if (error != 0 && error != ENOENT)
2386 #ifdef COMPAT_FREEBSD32
2387 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
2388 uint32_t hid32 = pr->pr_hostid;
2390 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
2393 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
2394 sizeof(pr->pr_hostid));
2395 if (error != 0 && error != ENOENT)
2397 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
2398 sizeof(pr->pr_enforce_statfs));
2399 if (error != 0 && error != ENOENT)
2401 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
2402 sizeof(pr->pr_devfs_rsnum));
2403 if (error != 0 && error != ENOENT)
2405 for (bf = pr_flag_bool;
2406 bf < pr_flag_bool + nitems(pr_flag_bool);
2408 i = (pr->pr_flags & bf->flag) ? 1 : 0;
2409 error = vfs_setopt(opts, bf->name, &i, sizeof(i));
2410 if (error != 0 && error != ENOENT)
2413 error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
2414 if (error != 0 && error != ENOENT)
2417 for (jsf = pr_flag_jailsys;
2418 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
2420 f = pr->pr_flags & (jsf->disable | jsf->new);
2421 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE
2422 : (f == jsf->new) ? JAIL_SYS_NEW
2424 error = vfs_setopt(opts, jsf->name, &i, sizeof(i));
2425 if (error != 0 && error != ENOENT)
2428 for (bf = pr_flag_allow;
2429 bf < pr_flag_allow + nitems(pr_flag_allow) &&
2430 atomic_load_int(&bf->flag) != 0;
2432 i = (pr->pr_allow & bf->flag) ? 1 : 0;
2433 error = vfs_setopt(opts, bf->name, &i, sizeof(i));
2434 if (error != 0 && error != ENOENT)
2437 error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
2438 if (error != 0 && error != ENOENT)
2441 i = !prison_isalive(pr);
2442 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2443 if (error != 0 && error != ENOENT)
2446 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2447 if (error != 0 && error != ENOENT)
2449 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate,
2450 sizeof(pr->pr_osreldate));
2451 if (error != 0 && error != ENOENT)
2453 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease);
2454 if (error != 0 && error != ENOENT)
2457 /* Get the module parameters. */
2458 mtx_unlock(&pr->pr_mtx);
2459 drflags &= ~PD_LOCKED;
2460 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2463 prison_deref(pr, drflags);
2467 /* By now, all parameters should have been noted. */
2468 TAILQ_FOREACH(opt, opts, link) {
2469 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2471 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2476 /* Write the fetched parameters back to userspace. */
2478 TAILQ_FOREACH(opt, opts, link) {
2479 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2480 pos = 2 * opt->pos + 1;
2481 optuio->uio_iov[pos].iov_len = opt->len;
2482 if (opt->value != NULL) {
2483 if (optuio->uio_segflg == UIO_SYSSPACE) {
2485 optuio->uio_iov[pos].iov_base,
2488 error = copyout(opt->value,
2489 optuio->uio_iov[pos].iov_base,
2499 /* Release any temporary prison holds and/or locks. */
2501 prison_deref(pr, drflags);
2502 else if (drflags & PD_LIST_SLOCKED)
2503 sx_sunlock(&allprison_lock);
2504 if (error && errmsg_pos >= 0) {
2505 /* Write the error message back to userspace. */
2506 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2507 errmsg_pos = 2 * errmsg_pos + 1;
2508 if (errmsg_len > 0) {
2509 if (optuio->uio_segflg == UIO_SYSSPACE)
2511 optuio->uio_iov[errmsg_pos].iov_base,
2515 optuio->uio_iov[errmsg_pos].iov_base,
2524 * struct jail_remove_args {
2529 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
2534 error = priv_check(td, PRIV_JAIL_REMOVE);
2538 sx_xlock(&allprison_lock);
2539 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2541 sx_xunlock(&allprison_lock);
2544 if (!prison_isalive(pr)) {
2545 /* Silently ignore already-dying prisons. */
2546 mtx_unlock(&pr->pr_mtx);
2547 sx_xunlock(&allprison_lock);
2550 prison_deref(pr, PD_KILL | PD_LOCKED | PD_LIST_XLOCKED);
2555 * struct jail_attach_args {
2560 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
2565 error = priv_check(td, PRIV_JAIL_ATTACH);
2569 sx_slock(&allprison_lock);
2570 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2572 sx_sunlock(&allprison_lock);
2576 /* Do not allow a process to attach to a prison that is not alive. */
2577 if (!prison_isalive(pr)) {
2578 mtx_unlock(&pr->pr_mtx);
2579 sx_sunlock(&allprison_lock);
2583 return (do_jail_attach(td, pr, PD_LOCKED | PD_LIST_SLOCKED));
2587 do_jail_attach(struct thread *td, struct prison *pr, int drflags)
2590 struct ucred *newcred, *oldcred;
2593 mtx_assert(&pr->pr_mtx, MA_OWNED);
2594 sx_assert(&allprison_lock, SX_LOCKED);
2595 drflags &= PD_LOCK_FLAGS;
2597 * XXX: Note that there is a slight race here if two threads
2598 * in the same privileged process attempt to attach to two
2599 * different jails at the same time. It is important for
2600 * user processes not to do this, or they might end up with
2601 * a process root from one prison, but attached to the jail
2605 refcount_acquire(&pr->pr_uref);
2606 drflags |= PD_DEREF | PD_DEUREF;
2607 mtx_unlock(&pr->pr_mtx);
2608 drflags &= ~PD_LOCKED;
2610 /* Let modules do whatever they need to prepare for attaching. */
2611 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
2613 prison_deref(pr, drflags);
2616 sx_unlock(&allprison_lock);
2617 drflags &= ~(PD_LIST_SLOCKED | PD_LIST_XLOCKED);
2620 * Reparent the newly attached process to this jail.
2623 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
2627 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
2628 if ((error = change_dir(pr->pr_root, td)) != 0)
2631 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
2634 VOP_UNLOCK(pr->pr_root);
2635 if ((error = pwd_chroot_chdir(td, pr->pr_root)))
2640 oldcred = crcopysafe(p, newcred);
2641 newcred->cr_prison = pr;
2642 proc_set_cred(p, newcred);
2645 racct_proc_ucred_changed(p, oldcred, newcred);
2650 rctl_proc_ucred_changed(p, newcred);
2653 prison_proc_relink(oldcred->cr_prison, pr, p);
2654 prison_deref(oldcred->cr_prison, drflags);
2658 * If the prison was killed while changing credentials, die along
2661 if (!prison_isalive(pr)) {
2663 kern_psignal(p, SIGKILL);
2670 VOP_UNLOCK(pr->pr_root);
2672 /* Tell modules this thread is still in its old jail after all. */
2673 sx_slock(&allprison_lock);
2674 drflags |= PD_LIST_SLOCKED;
2675 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td);
2676 prison_deref(pr, drflags);
2681 * Returns a locked prison instance, or NULL on failure.
2684 prison_find(int prid)
2688 sx_assert(&allprison_lock, SX_LOCKED);
2689 TAILQ_FOREACH(pr, &allprison, pr_list) {
2690 if (pr->pr_id < prid)
2692 if (pr->pr_id > prid)
2694 KASSERT(prison_isvalid(pr), ("Found invalid prison %p", pr));
2695 mtx_lock(&pr->pr_mtx);
2702 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
2705 prison_find_child(struct prison *mypr, int prid)
2710 sx_assert(&allprison_lock, SX_LOCKED);
2711 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2712 if (pr->pr_id == prid) {
2713 KASSERT(prison_isvalid(pr),
2714 ("Found invalid prison %p", pr));
2715 mtx_lock(&pr->pr_mtx);
2723 * Look for the name relative to mypr. Returns a locked prison or NULL.
2726 prison_find_name(struct prison *mypr, const char *name)
2728 struct prison *pr, *deadpr;
2732 sx_assert(&allprison_lock, SX_LOCKED);
2733 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
2735 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2736 if (!strcmp(pr->pr_name + mylen, name)) {
2737 KASSERT(prison_isvalid(pr),
2738 ("Found invalid prison %p", pr));
2739 if (prison_isalive(pr)) {
2740 mtx_lock(&pr->pr_mtx);
2746 /* There was no valid prison - perhaps there was a dying one. */
2748 mtx_lock(&deadpr->pr_mtx);
2753 * See if a prison has the specific flag set. The prison should be locked,
2754 * unless checking for flags that are only set at jail creation (such as
2755 * PR_IP4 and PR_IP6), or only the single bit is examined, without regard
2756 * to any other prison data.
2759 prison_flag(struct ucred *cred, unsigned flag)
2762 return (cred->cr_prison->pr_flags & flag);
2766 prison_allow(struct ucred *cred, unsigned flag)
2769 return ((cred->cr_prison->pr_allow & flag) != 0);
2773 * Hold a prison reference, by incrementing pr_ref. It is generally
2774 * an error to hold a prison that does not already have a reference.
2775 * A prison record will remain valid as long as it has at least one
2776 * reference, and will not be removed as long as either the prison
2777 * mutex or the allprison lock is held (allprison_lock may be shared).
2780 prison_hold_locked(struct prison *pr)
2783 /* Locking is no longer required. */
2788 prison_hold(struct prison *pr)
2791 int was_valid = refcount_acquire_if_not_zero(&pr->pr_ref);
2794 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id));
2796 refcount_acquire(&pr->pr_ref);
2801 * Remove a prison reference. If that was the last reference, the
2802 * prison will be removed (at a later time).
2805 prison_free_locked(struct prison *pr)
2808 mtx_assert(&pr->pr_mtx, MA_OWNED);
2810 * Locking is no longer required, but unlock because the caller
2813 mtx_unlock(&pr->pr_mtx);
2818 prison_free(struct prison *pr)
2821 KASSERT(refcount_load(&pr->pr_ref) > 0,
2822 ("Trying to free dead prison %p (jid=%d).",
2824 if (!refcount_release_if_not_last(&pr->pr_ref)) {
2826 * Don't remove the last reference in this context,
2827 * in case there are locks held.
2829 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2834 prison_free_not_last(struct prison *pr)
2839 KASSERT(refcount_load(&pr->pr_ref) > 0,
2840 ("Trying to free dead prison %p (jid=%d).",
2842 lastref = refcount_release(&pr->pr_ref);
2844 ("prison_free_not_last freed last ref on prison %p (jid=%d).",
2847 refcount_release(&pr->pr_ref);
2852 * Hold a prison for user visibility, by incrementing pr_uref.
2853 * It is generally an error to hold a prison that isn't already
2854 * user-visible, except through the jail system calls. It is also
2855 * an error to hold an invalid prison. A prison record will remain
2856 * alive as long as it has at least one user reference, and will not
2857 * be set to the dying state until the prison mutex and allprison_lock
2861 prison_proc_hold(struct prison *pr)
2864 int was_alive = refcount_acquire_if_not_zero(&pr->pr_uref);
2867 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
2869 refcount_acquire(&pr->pr_uref);
2874 * Remove a prison user reference. If it was the last reference, the
2875 * prison will be considered "dying", and may be removed once all of
2876 * its references are dropped.
2879 prison_proc_free(struct prison *pr)
2883 * Locking is only required when releasing the last reference.
2884 * This allows assurance that a locked prison will remain alive
2885 * until it is unlocked.
2887 KASSERT(refcount_load(&pr->pr_uref) > 0,
2888 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
2889 if (!refcount_release_if_not_last(&pr->pr_uref)) {
2891 * Don't remove the last user reference in this context,
2892 * which is expected to be a process that is not only locked,
2893 * but also half dead. Add a reference so any calls to
2894 * prison_free() won't re-submit the task.
2897 mtx_lock(&pr->pr_mtx);
2898 KASSERT(!(pr->pr_flags & PR_COMPLETE_PROC),
2899 ("Redundant last reference in prison_proc_free (jid=%d)",
2901 pr->pr_flags |= PR_COMPLETE_PROC;
2902 mtx_unlock(&pr->pr_mtx);
2903 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2908 prison_proc_free_not_last(struct prison *pr)
2913 KASSERT(refcount_load(&pr->pr_uref) > 0,
2914 ("Trying to free dead prison %p (jid=%d).",
2916 lastref = refcount_release(&pr->pr_uref);
2918 ("prison_proc_free_not_last freed last uref on prison %p (jid=%d).",
2921 refcount_release(&pr->pr_uref);
2926 prison_proc_link(struct prison *pr, struct proc *p)
2929 sx_assert(&allproc_lock, SA_XLOCKED);
2930 LIST_INSERT_HEAD(&pr->pr_proclist, p, p_jaillist);
2934 prison_proc_unlink(struct prison *pr, struct proc *p)
2937 sx_assert(&allproc_lock, SA_XLOCKED);
2938 LIST_REMOVE(p, p_jaillist);
2942 prison_proc_relink(struct prison *opr, struct prison *npr, struct proc *p)
2945 sx_xlock(&allproc_lock);
2946 prison_proc_unlink(opr, p);
2947 prison_proc_link(npr, p);
2948 sx_xunlock(&allproc_lock);
2952 * Complete a call to either prison_free or prison_proc_free.
2955 prison_complete(void *context, int pending)
2957 struct prison *pr = context;
2961 * This could be called to release the last reference, or the last
2962 * user reference (plus the reference held in prison_proc_free).
2964 drflags = prison_lock_xlock(pr, PD_DEREF);
2965 if (pr->pr_flags & PR_COMPLETE_PROC) {
2966 pr->pr_flags &= ~PR_COMPLETE_PROC;
2967 drflags |= PD_DEUREF;
2969 prison_deref(pr, drflags);
2973 prison_kill_processes_cb(struct proc *p, void *arg __unused)
2976 kern_psignal(p, SIGKILL);
2980 * Note the iteration does not guarantee acting on all processes.
2981 * Most notably there may be fork or jail_attach in progress.
2984 prison_proc_iterate(struct prison *pr, void (*cb)(struct proc *, void *),
2990 if (atomic_load_int(&pr->pr_childcount) == 0) {
2991 sx_slock(&allproc_lock);
2992 LIST_FOREACH(p, &pr->pr_proclist, p_jaillist) {
2993 if (p->p_state == PRS_NEW)
2999 sx_sunlock(&allproc_lock);
3000 if (atomic_load_int(&pr->pr_childcount) == 0)
3003 * Some jails popped up during the iteration, fall through to a
3004 * system-wide search.
3008 sx_slock(&allproc_lock);
3009 FOREACH_PROC_IN_SYSTEM(p) {
3011 if (p->p_state != PRS_NEW && p->p_ucred != NULL) {
3012 for (ppr = p->p_ucred->cr_prison;
3014 ppr = ppr->pr_parent) {
3023 sx_sunlock(&allproc_lock);
3027 * Remove a prison reference and/or user reference (usually).
3028 * This assumes context that allows sleeping (for allprison_lock),
3029 * with no non-sleeping locks held, except perhaps the prison itself.
3030 * If there are no more references, release and delist the prison.
3031 * On completion, the prison lock and the allprison lock are both
3035 prison_deref(struct prison *pr, int flags)
3037 struct prisonlist freeprison;
3038 struct prison *killpr, *rpr, *ppr, *tpr;
3041 TAILQ_INIT(&freeprison);
3043 * Release this prison as requested, which may cause its parent
3044 * to be released, and then maybe its grandparent, etc.
3047 if (flags & PD_KILL) {
3048 /* Kill the prison and its descendents. */
3049 KASSERT(pr != &prison0,
3050 ("prison_deref trying to kill prison0"));
3051 if (!(flags & PD_DEREF)) {
3055 flags = prison_lock_xlock(pr, flags);
3056 prison_deref_kill(pr, &freeprison);
3058 if (flags & PD_DEUREF) {
3059 /* Drop a user reference. */
3060 KASSERT(refcount_load(&pr->pr_uref) > 0,
3061 ("prison_deref PD_DEUREF on a dead prison (jid=%d)",
3063 if (!refcount_release_if_not_last(&pr->pr_uref)) {
3064 if (!(flags & PD_DEREF)) {
3068 flags = prison_lock_xlock(pr, flags);
3069 if (refcount_release(&pr->pr_uref) &&
3070 pr->pr_state == PRISON_STATE_ALIVE) {
3072 * When the last user references goes,
3073 * this becomes a dying prison.
3076 refcount_load(&prison0.pr_uref) > 0,
3077 ("prison0 pr_uref=0"));
3078 pr->pr_state = PRISON_STATE_DYING;
3079 mtx_unlock(&pr->pr_mtx);
3080 flags &= ~PD_LOCKED;
3085 if (flags & PD_KILL) {
3087 * Any remaining user references are probably processes
3088 * that need to be killed, either in this prison or its
3091 if (refcount_load(&pr->pr_uref) > 0)
3093 /* Make sure the parent prison doesn't get killed. */
3096 if (flags & PD_DEREF) {
3097 /* Drop a reference. */
3098 KASSERT(refcount_load(&pr->pr_ref) > 0,
3099 ("prison_deref PD_DEREF on a dead prison (jid=%d)",
3101 if (!refcount_release_if_not_last(&pr->pr_ref)) {
3102 flags = prison_lock_xlock(pr, flags);
3103 if (refcount_release(&pr->pr_ref)) {
3105 * When the last reference goes,
3106 * unlink the prison and set it aside.
3109 refcount_load(&pr->pr_uref) == 0,
3110 ("prison_deref: last ref, "
3111 "but still has %d urefs (jid=%d)",
3112 pr->pr_uref, pr->pr_id));
3114 refcount_load(&prison0.pr_ref) != 0,
3115 ("prison0 pr_ref=0"));
3116 pr->pr_state = PRISON_STATE_INVALID;
3117 TAILQ_REMOVE(&allprison, pr, pr_list);
3118 LIST_REMOVE(pr, pr_sibling);
3119 TAILQ_INSERT_TAIL(&freeprison, pr,
3121 for (ppr = pr->pr_parent;
3123 ppr = ppr->pr_parent)
3124 ppr->pr_childcount--;
3126 * Removing a prison frees references
3129 mtx_unlock(&pr->pr_mtx);
3130 flags &= ~PD_LOCKED;
3132 flags |= PD_DEREF | PD_DEUREF;
3140 /* Release all the prison locks. */
3141 if (flags & PD_LOCKED)
3142 mtx_unlock(&pr->pr_mtx);
3143 if (flags & PD_LIST_SLOCKED)
3144 sx_sunlock(&allprison_lock);
3145 else if (flags & PD_LIST_XLOCKED)
3146 sx_xunlock(&allprison_lock);
3148 /* Kill any processes attached to a killed prison. */
3150 prison_proc_iterate(killpr, prison_kill_processes_cb, NULL);
3153 * Finish removing any unreferenced prisons, which couldn't happen
3154 * while allprison_lock was held (to avoid a LOR on vrele).
3156 TAILQ_FOREACH_SAFE(rpr, &freeprison, pr_list, tpr) {
3158 if (rpr->pr_vnet != rpr->pr_parent->pr_vnet)
3159 vnet_destroy(rpr->pr_vnet);
3161 if (rpr->pr_root != NULL)
3162 vrele(rpr->pr_root);
3163 mtx_destroy(&rpr->pr_mtx);
3165 prison_ip_free(rpr->pr_addrs[PR_INET]);
3168 prison_ip_free(rpr->pr_addrs[PR_INET6]);
3170 if (rpr->pr_cpuset != NULL)
3171 cpuset_rel(rpr->pr_cpuset);
3175 prison_racct_detach(rpr);
3177 TAILQ_REMOVE(&freeprison, rpr, pr_list);
3178 free(rpr, M_PRISON);
3183 * Kill the prison and its descendants. Mark them as dying, clear the
3184 * persist flag, and call module remove methods.
3187 prison_deref_kill(struct prison *pr, struct prisonlist *freeprison)
3189 struct prison *cpr, *ppr, *rpr;
3193 * Unlike the descendants, the target prison can be killed
3194 * even if it is currently dying. This is useful for failed
3195 * creation in jail_set(2).
3197 KASSERT(refcount_load(&pr->pr_ref) > 0,
3198 ("Trying to kill dead prison %p (jid=%d).",
3200 refcount_acquire(&pr->pr_uref);
3201 pr->pr_state = PRISON_STATE_DYING;
3202 mtx_unlock(&pr->pr_mtx);
3205 FOREACH_PRISON_DESCENDANT_PRE_POST(pr, cpr, descend) {
3207 if (!prison_isalive(cpr)) {
3212 prison_proc_hold(cpr);
3213 mtx_lock(&cpr->pr_mtx);
3214 cpr->pr_state = PRISON_STATE_DYING;
3215 cpr->pr_flags |= PR_REMOVE;
3216 mtx_unlock(&cpr->pr_mtx);
3219 if (!(cpr->pr_flags & PR_REMOVE))
3221 prison_cleanup(cpr);
3222 mtx_lock(&cpr->pr_mtx);
3223 cpr->pr_flags &= ~PR_REMOVE;
3224 if (cpr->pr_flags & PR_PERSIST) {
3225 cpr->pr_flags &= ~PR_PERSIST;
3226 prison_proc_free_not_last(cpr);
3227 prison_free_not_last(cpr);
3229 (void)refcount_release(&cpr->pr_uref);
3230 if (refcount_release(&cpr->pr_ref)) {
3232 * When the last reference goes, unlink the prison
3233 * and set it aside for prison_deref() to handle.
3234 * Delay unlinking the sibling list to keep the loop
3238 LIST_REMOVE(rpr, pr_sibling);
3240 rpr->pr_state = PRISON_STATE_INVALID;
3241 TAILQ_REMOVE(&allprison, rpr, pr_list);
3242 TAILQ_INSERT_TAIL(freeprison, rpr, pr_list);
3244 * Removing a prison frees references from its parent.
3246 ppr = rpr->pr_parent;
3247 prison_proc_free_not_last(ppr);
3248 prison_free_not_last(ppr);
3249 for (; ppr != NULL; ppr = ppr->pr_parent)
3250 ppr->pr_childcount--;
3252 mtx_unlock(&cpr->pr_mtx);
3255 LIST_REMOVE(rpr, pr_sibling);
3258 mtx_lock(&pr->pr_mtx);
3259 if (pr->pr_flags & PR_PERSIST) {
3260 pr->pr_flags &= ~PR_PERSIST;
3261 prison_proc_free_not_last(pr);
3262 prison_free_not_last(pr);
3264 (void)refcount_release(&pr->pr_uref);
3268 * Given the current locking state in the flags, make sure allprison_lock
3269 * is held exclusive, and the prison is locked. Return flags indicating
3273 prison_lock_xlock(struct prison *pr, int flags)
3276 if (!(flags & PD_LIST_XLOCKED)) {
3278 * Get allprison_lock, which may be an upgrade,
3279 * and may require unlocking the prison.
3281 if (flags & PD_LOCKED) {
3282 mtx_unlock(&pr->pr_mtx);
3283 flags &= ~PD_LOCKED;
3285 if (flags & PD_LIST_SLOCKED) {
3286 if (!sx_try_upgrade(&allprison_lock)) {
3287 sx_sunlock(&allprison_lock);
3288 sx_xlock(&allprison_lock);
3290 flags &= ~PD_LIST_SLOCKED;
3292 sx_xlock(&allprison_lock);
3293 flags |= PD_LIST_XLOCKED;
3295 if (!(flags & PD_LOCKED)) {
3296 /* Lock the prison mutex. */
3297 mtx_lock(&pr->pr_mtx);
3304 * Release a prison's resources when it starts dying (when the last user
3305 * reference is dropped, or when it is killed).
3308 prison_cleanup(struct prison *pr)
3310 sx_assert(&allprison_lock, SA_XLOCKED);
3311 mtx_assert(&pr->pr_mtx, MA_NOTOWNED);
3312 shm_remove_prison(pr);
3313 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
3317 * Set or clear a permission bit in the pr_allow field, passing restrictions
3318 * (cleared permission) down to child jails.
3321 prison_set_allow(struct ucred *cred, unsigned flag, int enable)
3325 pr = cred->cr_prison;
3326 sx_slock(&allprison_lock);
3327 mtx_lock(&pr->pr_mtx);
3328 prison_set_allow_locked(pr, flag, enable);
3329 mtx_unlock(&pr->pr_mtx);
3330 sx_sunlock(&allprison_lock);
3334 prison_set_allow_locked(struct prison *pr, unsigned flag, int enable)
3340 pr->pr_allow |= flag;
3342 pr->pr_allow &= ~flag;
3343 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
3344 cpr->pr_allow &= ~flag;
3349 * Check if a jail supports the given address family.
3351 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
3355 prison_check_af(struct ucred *cred, int af)
3360 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3362 pr = cred->cr_prison;
3364 /* Prisons with their own network stack are not limited. */
3365 if (prison_owns_vnet(cred))
3374 if (pr->pr_flags & PR_IP4)
3376 mtx_lock(&pr->pr_mtx);
3377 if ((pr->pr_flags & PR_IP4) &&
3378 pr->pr_addrs[PR_INET] == NULL)
3379 error = EAFNOSUPPORT;
3380 mtx_unlock(&pr->pr_mtx);
3386 if (pr->pr_flags & PR_IP6)
3388 mtx_lock(&pr->pr_mtx);
3389 if ((pr->pr_flags & PR_IP6) &&
3390 pr->pr_addrs[PR_INET6] == NULL)
3391 error = EAFNOSUPPORT;
3392 mtx_unlock(&pr->pr_mtx);
3400 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
3401 error = EAFNOSUPPORT;
3407 * Check if given address belongs to the jail referenced by cred (wrapper to
3408 * prison_check_ip[46]).
3410 * Returns 0 if jail doesn't restrict the address family or if address belongs
3411 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
3412 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
3415 prison_if(struct ucred *cred, const struct sockaddr *sa)
3418 const struct sockaddr_in *sai;
3421 const struct sockaddr_in6 *sai6;
3425 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3426 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
3429 if (prison_owns_vnet(cred))
3434 switch (sa->sa_family)
3438 sai = (const struct sockaddr_in *)sa;
3439 error = prison_check_ip4(cred, &sai->sin_addr);
3444 sai6 = (const struct sockaddr_in6 *)sa;
3445 error = prison_check_ip6(cred, &sai6->sin6_addr);
3449 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
3450 error = EAFNOSUPPORT;
3456 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
3459 prison_check(struct ucred *cred1, struct ucred *cred2)
3462 return ((cred1->cr_prison == cred2->cr_prison ||
3463 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
3467 * Return 1 if p2 is a child of p1, otherwise 0.
3470 prison_ischild(struct prison *pr1, struct prison *pr2)
3473 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
3480 * Return true if the prison is currently alive. A prison is alive if it
3481 * holds user references and it isn't being removed.
3484 prison_isalive(const struct prison *pr)
3487 if (__predict_false(pr->pr_state != PRISON_STATE_ALIVE))
3493 * Return true if the prison is currently valid. A prison is valid if it has
3494 * been fully created, and is not being destroyed. Note that dying prisons
3495 * are still considered valid. Invalid prisons won't be found under normal
3496 * circumstances, as they're only put in that state by functions that have
3497 * an exclusive hold on allprison_lock.
3500 prison_isvalid(struct prison *pr)
3503 if (__predict_false(pr->pr_state == PRISON_STATE_INVALID))
3505 if (__predict_false(refcount_load(&pr->pr_ref) == 0))
3511 * Return 1 if the passed credential is in a jail and that jail does not
3512 * have its own virtual network stack, otherwise 0.
3515 jailed_without_vnet(struct ucred *cred)
3521 if (prison_owns_vnet(cred))
3529 * Return the correct hostname (domainname, et al) for the passed credential.
3532 getcredhostname(struct ucred *cred, char *buf, size_t size)
3537 * A NULL credential can be used to shortcut to the physical
3538 * system's hostname.
3540 pr = (cred != NULL) ? cred->cr_prison : &prison0;
3541 mtx_lock(&pr->pr_mtx);
3542 strlcpy(buf, pr->pr_hostname, size);
3543 mtx_unlock(&pr->pr_mtx);
3547 getcreddomainname(struct ucred *cred, char *buf, size_t size)
3550 mtx_lock(&cred->cr_prison->pr_mtx);
3551 strlcpy(buf, cred->cr_prison->pr_domainname, size);
3552 mtx_unlock(&cred->cr_prison->pr_mtx);
3556 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
3559 mtx_lock(&cred->cr_prison->pr_mtx);
3560 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
3561 mtx_unlock(&cred->cr_prison->pr_mtx);
3565 getcredhostid(struct ucred *cred, unsigned long *hostid)
3568 mtx_lock(&cred->cr_prison->pr_mtx);
3569 *hostid = cred->cr_prison->pr_hostid;
3570 mtx_unlock(&cred->cr_prison->pr_mtx);
3574 getjailname(struct ucred *cred, char *name, size_t len)
3577 mtx_lock(&cred->cr_prison->pr_mtx);
3578 strlcpy(name, cred->cr_prison->pr_name, len);
3579 mtx_unlock(&cred->cr_prison->pr_mtx);
3584 * Determine whether the prison represented by cred owns
3585 * its vnet rather than having it inherited.
3587 * Returns 1 in case the prison owns the vnet, 0 otherwise.
3590 prison_owns_vnet(struct ucred *cred)
3594 * vnets cannot be added/removed after jail creation,
3595 * so no need to lock here.
3597 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
3602 * Determine whether the subject represented by cred can "see"
3603 * status of a mount point.
3604 * Returns: 0 for permitted, ENOENT otherwise.
3605 * XXX: This function should be called cr_canseemount() and should be
3606 * placed in kern_prot.c.
3609 prison_canseemount(struct ucred *cred, struct mount *mp)
3615 pr = cred->cr_prison;
3616 if (pr->pr_enforce_statfs == 0)
3618 if (pr->pr_root->v_mount == mp)
3620 if (pr->pr_enforce_statfs == 2)
3623 * If jail's chroot directory is set to "/" we should be able to see
3624 * all mount-points from inside a jail.
3625 * This is ugly check, but this is the only situation when jail's
3626 * directory ends with '/'.
3628 if (strcmp(pr->pr_path, "/") == 0)
3630 len = strlen(pr->pr_path);
3632 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
3635 * Be sure that we don't have situation where jail's root directory
3636 * is "/some/path" and mount point is "/some/pathpath".
3638 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
3644 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
3646 char jpath[MAXPATHLEN];
3650 pr = cred->cr_prison;
3651 if (pr->pr_enforce_statfs == 0)
3653 if (prison_canseemount(cred, mp) != 0) {
3654 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3655 strlcpy(sp->f_mntonname, "[restricted]",
3656 sizeof(sp->f_mntonname));
3659 if (pr->pr_root->v_mount == mp) {
3661 * Clear current buffer data, so we are sure nothing from
3662 * the valid path left there.
3664 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3665 *sp->f_mntonname = '/';
3669 * If jail's chroot directory is set to "/" we should be able to see
3670 * all mount-points from inside a jail.
3672 if (strcmp(pr->pr_path, "/") == 0)
3674 len = strlen(pr->pr_path);
3675 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
3677 * Clear current buffer data, so we are sure nothing from
3678 * the valid path left there.
3680 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3681 if (*jpath == '\0') {
3682 /* Should never happen. */
3683 *sp->f_mntonname = '/';
3685 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
3690 * Check with permission for a specific privilege is granted within jail. We
3691 * have a specific list of accepted privileges; the rest are denied.
3694 prison_priv_check(struct ucred *cred, int priv)
3700 * Some policies have custom handlers. This routine should not be
3701 * called for them. See priv_check_cred().
3704 case PRIV_VFS_LOOKUP:
3705 case PRIV_VFS_GENERATION:
3706 KASSERT(0, ("prison_priv_check instead of a custom handler "
3707 "called for %d\n", priv));
3715 * Privileges specific to prisons with a virtual network stack.
3716 * There might be a duplicate entry here in case the privilege
3717 * is only granted conditionally in the legacy jail case.
3722 * NFS-specific privileges.
3724 case PRIV_NFS_DAEMON:
3725 case PRIV_NFS_LOCKD:
3728 * Network stack privileges.
3730 case PRIV_NET_BRIDGE:
3733 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
3734 case PRIV_NET_ROUTE:
3736 case PRIV_NET_SETIFMTU:
3737 case PRIV_NET_SETIFFLAGS:
3738 case PRIV_NET_SETIFCAP:
3739 case PRIV_NET_SETIFDESCR:
3740 case PRIV_NET_SETIFNAME :
3741 case PRIV_NET_SETIFMETRIC:
3742 case PRIV_NET_SETIFPHYS:
3743 case PRIV_NET_SETIFMAC:
3744 case PRIV_NET_SETLANPCP:
3745 case PRIV_NET_ADDMULTI:
3746 case PRIV_NET_DELMULTI:
3747 case PRIV_NET_HWIOCTL:
3748 case PRIV_NET_SETLLADDR:
3749 case PRIV_NET_ADDIFGROUP:
3750 case PRIV_NET_DELIFGROUP:
3751 case PRIV_NET_IFCREATE:
3752 case PRIV_NET_IFDESTROY:
3753 case PRIV_NET_ADDIFADDR:
3754 case PRIV_NET_DELIFADDR:
3757 case PRIV_NET_SETIFVNET:
3758 case PRIV_NET_SETIFFIB:
3763 * 802.11-related privileges.
3765 case PRIV_NET80211_VAP_GETKEY:
3766 case PRIV_NET80211_VAP_MANAGE:
3772 case PRIV_NETATM_CFG:
3773 case PRIV_NETATM_ADD:
3774 case PRIV_NETATM_DEL:
3775 case PRIV_NETATM_SET:
3778 * Bluetooth privileges.
3780 case PRIV_NETBLUETOOTH_RAW:
3784 * Netgraph and netgraph module privileges.
3786 case PRIV_NETGRAPH_CONTROL:
3788 case PRIV_NETGRAPH_TTY:
3792 * IPv4 and IPv6 privileges.
3794 case PRIV_NETINET_IPFW:
3795 case PRIV_NETINET_DIVERT:
3796 case PRIV_NETINET_PF:
3797 case PRIV_NETINET_DUMMYNET:
3798 case PRIV_NETINET_CARP:
3799 case PRIV_NETINET_MROUTE:
3800 case PRIV_NETINET_RAW:
3801 case PRIV_NETINET_ADDRCTRL6:
3802 case PRIV_NETINET_ND6:
3803 case PRIV_NETINET_SCOPE6:
3804 case PRIV_NETINET_ALIFETIME6:
3805 case PRIV_NETINET_IPSEC:
3806 case PRIV_NETINET_BINDANY:
3821 * No default: or deny here.
3822 * In case of no permit fall through to next switch().
3824 if (cred->cr_prison->pr_flags & PR_VNET)
3831 * Allow ktrace privileges for root in jail.
3837 * Allow jailed processes to configure audit identity and
3838 * submit audit records (login, etc). In the future we may
3839 * want to further refine the relationship between audit and
3842 case PRIV_AUDIT_GETAUDIT:
3843 case PRIV_AUDIT_SETAUDIT:
3844 case PRIV_AUDIT_SUBMIT:
3848 * Allow jailed processes to manipulate process UNIX
3849 * credentials in any way they see fit.
3851 case PRIV_CRED_SETUID:
3852 case PRIV_CRED_SETEUID:
3853 case PRIV_CRED_SETGID:
3854 case PRIV_CRED_SETEGID:
3855 case PRIV_CRED_SETGROUPS:
3856 case PRIV_CRED_SETREUID:
3857 case PRIV_CRED_SETREGID:
3858 case PRIV_CRED_SETRESUID:
3859 case PRIV_CRED_SETRESGID:
3862 * Jail implements visibility constraints already, so allow
3863 * jailed root to override uid/gid-based constraints.
3865 case PRIV_SEEOTHERGIDS:
3866 case PRIV_SEEOTHERUIDS:
3869 * Jail implements inter-process debugging limits already, so
3870 * allow jailed root various debugging privileges.
3872 case PRIV_DEBUG_DIFFCRED:
3873 case PRIV_DEBUG_SUGID:
3874 case PRIV_DEBUG_UNPRIV:
3877 * Allow jail to set various resource limits and login
3878 * properties, and for now, exceed process resource limits.
3880 case PRIV_PROC_LIMIT:
3881 case PRIV_PROC_SETLOGIN:
3882 case PRIV_PROC_SETRLIMIT:
3885 * System V and POSIX IPC privileges are granted in jail.
3888 case PRIV_IPC_WRITE:
3889 case PRIV_IPC_ADMIN:
3890 case PRIV_IPC_MSGSIZE:
3894 * Jail operations within a jail work on child jails.
3896 case PRIV_JAIL_ATTACH:
3898 case PRIV_JAIL_REMOVE:
3901 * Jail implements its own inter-process limits, so allow
3902 * root processes in jail to change scheduling on other
3903 * processes in the same jail. Likewise for signalling.
3905 case PRIV_SCHED_DIFFCRED:
3906 case PRIV_SCHED_CPUSET:
3907 case PRIV_SIGNAL_DIFFCRED:
3908 case PRIV_SIGNAL_SUGID:
3911 * Allow jailed processes to write to sysctls marked as jail
3914 case PRIV_SYSCTL_WRITEJAIL:
3917 * Allow root in jail to manage a variety of quota
3918 * properties. These should likely be conditional on a
3919 * configuration option.
3921 case PRIV_VFS_GETQUOTA:
3922 case PRIV_VFS_SETQUOTA:
3925 * Since Jail relies on chroot() to implement file system
3926 * protections, grant many VFS privileges to root in jail.
3927 * Be careful to exclude mount-related and NFS-related
3931 case PRIV_VFS_WRITE:
3932 case PRIV_VFS_ADMIN:
3934 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
3935 case PRIV_VFS_CHFLAGS_DEV:
3936 case PRIV_VFS_CHOWN:
3937 case PRIV_VFS_CHROOT:
3938 case PRIV_VFS_RETAINSUGID:
3939 case PRIV_VFS_FCHROOT:
3941 case PRIV_VFS_SETGID:
3943 case PRIV_VFS_STICKYFILE:
3946 * As in the non-jail case, non-root users are expected to be
3947 * able to read kernel/physical memory (provided /dev/[k]mem
3948 * exists in the jail and they have permission to access it).
3950 case PRIV_KMEM_READ:
3954 * Depending on the global setting, allow privilege of
3955 * setting system flags.
3957 case PRIV_VFS_SYSFLAGS:
3958 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
3964 * Depending on the global setting, allow privilege of
3965 * mounting/unmounting file systems.
3967 case PRIV_VFS_MOUNT:
3968 case PRIV_VFS_UNMOUNT:
3969 case PRIV_VFS_MOUNT_NONUSER:
3970 case PRIV_VFS_MOUNT_OWNER:
3971 pr = cred->cr_prison;
3973 if (pr->pr_allow & PR_ALLOW_MOUNT && pr->pr_enforce_statfs < 2)
3981 * Jails should hold no disposition on the PRIV_VFS_READ_DIR
3982 * policy. priv_check_cred will not specifically allow it, and
3983 * we may want a MAC policy to allow it.
3985 case PRIV_VFS_READ_DIR:
3989 * Conditionnaly allow locking (unlocking) physical pages
3993 case PRIV_VM_MUNLOCK:
3994 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK)
4000 * Conditionally allow jailed root to bind reserved ports.
4002 case PRIV_NETINET_RESERVEDPORT:
4003 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS)
4009 * Allow jailed root to reuse in-use ports.
4011 case PRIV_NETINET_REUSEPORT:
4015 * Allow jailed root to set certain IPv4/6 (option) headers.
4017 case PRIV_NETINET_SETHDROPTS:
4021 * Conditionally allow creating raw sockets in jail.
4023 case PRIV_NETINET_RAW:
4024 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
4030 * Since jail implements its own visibility limits on netstat
4031 * sysctls, allow getcred. This allows identd to work in
4034 case PRIV_NETINET_GETCRED:
4038 * Allow jailed root to set loginclass.
4040 case PRIV_PROC_SETLOGINCLASS:
4044 * Do not allow a process inside a jail to read the kernel
4045 * message buffer unless explicitly permitted.
4048 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF)
4054 * In all remaining cases, deny the privilege request. This
4055 * includes almost all network privileges, many system
4056 * configuration privileges.
4063 * Return the part of pr2's name that is relative to pr1, or the whole name
4064 * if it does not directly follow.
4068 prison_name(struct prison *pr1, struct prison *pr2)
4072 /* Jails see themselves as "0" (if they see themselves at all). */
4075 name = pr2->pr_name;
4076 if (prison_ischild(pr1, pr2)) {
4078 * pr1 isn't locked (and allprison_lock may not be either)
4079 * so its length can't be counted on. But the number of dots
4080 * can be counted on - and counted.
4082 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
4083 name = strchr(name, '.') + 1;
4089 * Return the part of pr2's path that is relative to pr1, or the whole path
4090 * if it does not directly follow.
4093 prison_path(struct prison *pr1, struct prison *pr2)
4095 char *path1, *path2;
4098 path1 = pr1->pr_path;
4099 path2 = pr2->pr_path;
4100 if (!strcmp(path1, "/"))
4102 len1 = strlen(path1);
4103 if (strncmp(path1, path2, len1))
4105 if (path2[len1] == '\0')
4107 if (path2[len1] == '/')
4108 return (path2 + len1);
4113 * Jail-related sysctls.
4115 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
4118 #if defined(INET) || defined(INET6)
4120 * Copy address array to memory that would be then SYSCTL_OUT-ed.
4121 * sysctl_jail_list() helper.
4124 prison_ip_copyout(struct prison *pr, const pr_family_t af, void **out, int *len)
4126 const size_t size = pr_families[af].size;
4129 mtx_assert(&pr->pr_mtx, MA_OWNED);
4130 if (pr->pr_addrs[af] != NULL) {
4131 if (*len < pr->pr_addrs[af]->ips) {
4132 *len = pr->pr_addrs[af]->ips;
4133 mtx_unlock(&pr->pr_mtx);
4134 *out = realloc(*out, *len * size, M_TEMP, M_WAITOK);
4135 mtx_lock(&pr->pr_mtx);
4138 bcopy(pr->pr_addrs[af] + 1, *out, pr->pr_addrs[af]->ips * size);
4144 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
4147 struct prison *pr, *cpr;
4149 struct in_addr *ip4 = NULL;
4153 struct in6_addr *ip6 = NULL;
4158 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
4159 pr = req->td->td_ucred->cr_prison;
4161 sx_slock(&allprison_lock);
4162 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
4163 mtx_lock(&cpr->pr_mtx);
4165 prison_ip_copyout(cpr, PR_INET, (void **)&ip4, &ip4s);
4168 prison_ip_copyout(cpr, PR_INET6, (void **)&ip6, &ip6s);
4170 bzero(xp, sizeof(*xp));
4171 xp->pr_version = XPRISON_VERSION;
4172 xp->pr_id = cpr->pr_id;
4173 xp->pr_state = cpr->pr_state;
4174 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
4175 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
4176 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
4183 mtx_unlock(&cpr->pr_mtx);
4184 error = SYSCTL_OUT(req, xp, sizeof(*xp));
4188 if (xp->pr_ip4s > 0) {
4189 error = SYSCTL_OUT(req, ip4,
4190 xp->pr_ip4s * sizeof(struct in_addr));
4196 if (xp->pr_ip6s > 0) {
4197 error = SYSCTL_OUT(req, ip6,
4198 xp->pr_ip6s * sizeof(struct in6_addr));
4204 sx_sunlock(&allprison_lock);
4215 SYSCTL_OID(_security_jail, OID_AUTO, list,
4216 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4217 sysctl_jail_list, "S", "List of active jails");
4220 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
4224 injail = jailed(req->td->td_ucred);
4225 error = SYSCTL_OUT(req, &injail, sizeof(injail));
4230 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
4231 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4232 sysctl_jail_jailed, "I", "Process in jail?");
4235 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
4237 int error, havevnet;
4239 struct ucred *cred = req->td->td_ucred;
4241 havevnet = jailed(cred) && prison_owns_vnet(cred);
4245 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
4250 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
4251 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4252 sysctl_jail_vnet, "I", "Jail owns vnet?");
4254 #if defined(INET) || defined(INET6)
4255 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
4256 &jail_max_af_ips, 0,
4257 "Number of IP addresses a jail may have at most per address family (deprecated)");
4261 * Default parameters for jail(2) compatibility. For historical reasons,
4262 * the sysctl names have varying similarity to the parameter names. Prisons
4263 * just see their own parameters, and can't change them.
4266 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
4270 /* Get the current flag value, and convert it to a boolean. */
4271 if (req->td->td_ucred->cr_prison == &prison0) {
4272 mtx_lock(&prison0.pr_mtx);
4273 i = (jail_default_allow & arg2) != 0;
4274 mtx_unlock(&prison0.pr_mtx);
4276 i = prison_allow(req->td->td_ucred, arg2);
4280 error = sysctl_handle_int(oidp, &i, 0, req);
4281 if (error || !req->newptr)
4287 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
4290 mtx_lock(&prison0.pr_mtx);
4291 jail_default_allow = (jail_default_allow & ~arg2) | i;
4292 mtx_unlock(&prison0.pr_mtx);
4296 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
4297 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4298 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
4299 "Processes in jail can set their hostnames (deprecated)");
4300 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
4301 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4302 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
4303 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)");
4304 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
4305 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4306 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
4307 "Processes in jail can use System V IPC primitives (deprecated)");
4308 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
4309 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4310 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
4311 "Prison root can create raw sockets (deprecated)");
4312 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
4313 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4314 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
4315 "Processes in jail can alter system file flags (deprecated)");
4316 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
4317 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4318 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
4319 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)");
4322 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
4327 pr = req->td->td_ucred->cr_prison;
4328 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
4329 error = sysctl_handle_int(oidp, &level, 0, req);
4330 if (error || !req->newptr)
4332 *(int *)arg1 = level;
4336 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
4337 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4338 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
4339 sysctl_jail_default_level, "I",
4340 "Processes in jail cannot see all mounted file systems (deprecated)");
4342 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
4343 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
4344 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
4345 sysctl_jail_default_level, "I",
4346 "Ruleset for the devfs filesystem in jail (deprecated)");
4349 * Nodes to describe jail parameters. Maximum length of string parameters
4350 * is returned in the string itself, and the other parameters exist merely
4351 * to make themselves and their types known.
4353 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
4357 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
4364 switch (oidp->oid_kind & CTLTYPE)
4370 if (!(req->flags & SCTL_MASK32))
4372 return (SYSCTL_OUT(req, &l, sizeof(l)));
4376 return (SYSCTL_OUT(req, &i, sizeof(i)));
4377 case CTLTYPE_STRING:
4378 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
4380 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
4381 case CTLTYPE_STRUCT:
4383 return (SYSCTL_OUT(req, &s, sizeof(s)));
4389 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at
4390 * jail creation time but cannot be changed in an existing jail.
4392 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
4393 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
4394 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
4395 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
4396 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
4397 "I", "Jail secure level");
4398 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I",
4399 "Jail value for kern.osreldate and uname -K");
4400 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN,
4401 "Jail value for kern.osrelease and uname -r");
4402 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
4403 "I", "Jail cannot see all mounted file systems");
4404 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
4405 "I", "Ruleset for in-jail devfs mounts");
4406 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
4407 "B", "Jail persistence");
4409 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
4410 "E,jailsys", "Virtual network stack");
4412 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
4413 "B", "Jail is in the process of shutting down");
4415 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
4416 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
4417 "I", "Current number of child jails");
4418 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
4419 "I", "Maximum number of child jails");
4421 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
4422 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
4424 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
4425 "Jail NIS domainname");
4426 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
4428 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
4429 "LU", "Jail host ID");
4431 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
4432 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
4435 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
4436 "Jail IPv4 address virtualization");
4437 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
4438 "S,in_addr,a", "Jail IPv4 addresses");
4439 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4440 "B", "Do (not) use IPv4 source address selection rather than the "
4441 "primary jail IPv4 address.");
4444 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
4445 "Jail IPv6 address virtualization");
4446 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
4447 "S,in6_addr,a", "Jail IPv6 addresses");
4448 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4449 "B", "Do (not) use IPv6 source address selection rather than the "
4450 "primary jail IPv6 address.");
4453 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
4454 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
4455 "B", "Jail may set hostname");
4456 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
4457 "B", "Jail may use SYSV IPC");
4458 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
4459 "B", "Jail may create raw sockets");
4460 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
4461 "B", "Jail may alter system file flags");
4462 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
4463 "B", "Jail may set file quotas");
4464 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
4465 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
4466 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW,
4467 "B", "Jail may lock (unlock) physical pages in memory");
4468 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW,
4469 "B", "Jail may bind sockets to reserved ports");
4470 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW,
4471 "B", "Jail may read the kernel message buffer");
4472 SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW,
4473 "B", "Unprivileged processes may use process debugging facilities");
4474 SYSCTL_JAIL_PARAM(_allow, suser, CTLTYPE_INT | CTLFLAG_RW,
4475 "B", "Processes in jail with uid 0 have privilege");
4477 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
4478 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
4479 "B", "Jail may mount/unmount jail-friendly file systems in general");
4482 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return
4483 * its associated bit in the pr_allow bitmask, or zero if the parameter was
4487 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr,
4490 struct bool_flags *bf;
4491 struct sysctl_oid *parent;
4492 char *allow_name, *allow_noname, *allowed;
4493 #ifndef NO_SYSCTL_DESCR
4494 char *descr_deprecated;
4499 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name)
4501 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name)
4503 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 ||
4504 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) {
4505 free(allow_name, M_PRISON);
4510 * See if this parameter has already beed added, i.e. a module was
4511 * previously loaded/unloaded.
4513 mtx_lock(&prison0.pr_mtx);
4514 for (bf = pr_flag_allow;
4515 bf < pr_flag_allow + nitems(pr_flag_allow) &&
4516 atomic_load_int(&bf->flag) != 0;
4518 if (strcmp(bf->name, allow_name) == 0) {
4519 allow_flag = bf->flag;
4525 * Find a free bit in pr_allow_all, failing if there are none
4526 * (which shouldn't happen as long as we keep track of how many
4527 * potential dynamic flags exist).
4529 for (allow_flag = 1;; allow_flag <<= 1) {
4530 if (allow_flag == 0)
4532 if ((pr_allow_all & allow_flag) == 0)
4536 /* Note the parameter in the next open slot in pr_flag_allow. */
4537 for (bf = pr_flag_allow; ; bf++) {
4538 if (bf == pr_flag_allow + nitems(pr_flag_allow)) {
4539 /* This should never happen, but is not fatal. */
4543 if (atomic_load_int(&bf->flag) == 0)
4546 bf->name = allow_name;
4547 bf->noname = allow_noname;
4548 pr_allow_all |= allow_flag;
4550 * prison0 always has permission for the new parameter.
4551 * Other jails must have it granted to them.
4553 prison0.pr_allow |= allow_flag;
4554 /* The flag indicates a valid entry, so make sure it is set last. */
4555 atomic_store_rel_int(&bf->flag, allow_flag);
4556 mtx_unlock(&prison0.pr_mtx);
4559 * Create sysctls for the parameter, and the back-compat global
4563 ? SYSCTL_ADD_NODE(NULL,
4564 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow),
4565 OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr)
4566 : &sysctl___security_jail_param_allow;
4567 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO,
4568 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4569 NULL, 0, sysctl_jail_param, "B", descr);
4571 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name)
4572 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) {
4573 #ifndef NO_SYSCTL_DESCR
4574 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)",
4577 (void)SYSCTL_ADD_PROC(NULL,
4578 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed,
4579 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag,
4580 sysctl_jail_default_allow, "I", descr_deprecated);
4581 #ifndef NO_SYSCTL_DESCR
4582 free(descr_deprecated, M_TEMP);
4584 free(allowed, M_TEMP);
4589 mtx_unlock(&prison0.pr_mtx);
4590 free(allow_name, M_PRISON);
4591 free(allow_noname, M_PRISON);
4596 * The VFS system will register jail-aware filesystems here. They each get
4597 * a parameter allow.mount.xxxfs and a flag to check when a jailed user
4598 * attempts to mount.
4601 prison_add_vfs(struct vfsconf *vfsp)
4603 #ifdef NO_SYSCTL_DESCR
4605 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
4610 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system",
4612 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
4614 free(descr, M_TEMP);
4620 prison_racct_foreach(void (*callback)(struct racct *racct,
4621 void *arg2, void *arg3), void (*pre)(void), void (*post)(void),
4622 void *arg2, void *arg3)
4624 struct prison_racct *prr;
4626 ASSERT_RACCT_ENABLED();
4628 sx_slock(&allprison_lock);
4631 LIST_FOREACH(prr, &allprison_racct, prr_next)
4632 (callback)(prr->prr_racct, arg2, arg3);
4635 sx_sunlock(&allprison_lock);
4638 static struct prison_racct *
4639 prison_racct_find_locked(const char *name)
4641 struct prison_racct *prr;
4643 ASSERT_RACCT_ENABLED();
4644 sx_assert(&allprison_lock, SA_XLOCKED);
4646 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
4649 LIST_FOREACH(prr, &allprison_racct, prr_next) {
4650 if (strcmp(name, prr->prr_name) != 0)
4653 /* Found prison_racct with a matching name? */
4654 prison_racct_hold(prr);
4658 /* Add new prison_racct. */
4659 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
4660 racct_create(&prr->prr_racct);
4662 strcpy(prr->prr_name, name);
4663 refcount_init(&prr->prr_refcount, 1);
4664 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
4669 struct prison_racct *
4670 prison_racct_find(const char *name)
4672 struct prison_racct *prr;
4674 ASSERT_RACCT_ENABLED();
4676 sx_xlock(&allprison_lock);
4677 prr = prison_racct_find_locked(name);
4678 sx_xunlock(&allprison_lock);
4683 prison_racct_hold(struct prison_racct *prr)
4686 ASSERT_RACCT_ENABLED();
4688 refcount_acquire(&prr->prr_refcount);
4692 prison_racct_free_locked(struct prison_racct *prr)
4695 ASSERT_RACCT_ENABLED();
4696 sx_assert(&allprison_lock, SA_XLOCKED);
4698 if (refcount_release(&prr->prr_refcount)) {
4699 racct_destroy(&prr->prr_racct);
4700 LIST_REMOVE(prr, prr_next);
4701 free(prr, M_PRISON_RACCT);
4706 prison_racct_free(struct prison_racct *prr)
4709 ASSERT_RACCT_ENABLED();
4710 sx_assert(&allprison_lock, SA_UNLOCKED);
4712 if (refcount_release_if_not_last(&prr->prr_refcount))
4715 sx_xlock(&allprison_lock);
4716 prison_racct_free_locked(prr);
4717 sx_xunlock(&allprison_lock);
4721 prison_racct_attach(struct prison *pr)
4723 struct prison_racct *prr;
4725 ASSERT_RACCT_ENABLED();
4726 sx_assert(&allprison_lock, SA_XLOCKED);
4728 prr = prison_racct_find_locked(pr->pr_name);
4729 KASSERT(prr != NULL, ("cannot find prison_racct"));
4731 pr->pr_prison_racct = prr;
4735 * Handle jail renaming. From the racct point of view, renaming means
4736 * moving from one prison_racct to another.
4739 prison_racct_modify(struct prison *pr)
4745 struct prison_racct *oldprr;
4747 ASSERT_RACCT_ENABLED();
4749 sx_slock(&allproc_lock);
4750 sx_xlock(&allprison_lock);
4752 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
4753 sx_xunlock(&allprison_lock);
4754 sx_sunlock(&allproc_lock);
4758 oldprr = pr->pr_prison_racct;
4759 pr->pr_prison_racct = NULL;
4761 prison_racct_attach(pr);
4764 * Move resource utilisation records.
4766 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
4770 * Force rctl to reattach rules to processes.
4772 FOREACH_PROC_IN_SYSTEM(p) {
4774 cred = crhold(p->p_ucred);
4776 rctl_proc_ucred_changed(p, cred);
4781 sx_sunlock(&allproc_lock);
4782 prison_racct_free_locked(oldprr);
4783 sx_xunlock(&allprison_lock);
4787 prison_racct_detach(struct prison *pr)
4790 ASSERT_RACCT_ENABLED();
4791 sx_assert(&allprison_lock, SA_UNLOCKED);
4793 if (pr->pr_prison_racct == NULL)
4795 prison_racct_free(pr->pr_prison_racct);
4796 pr->pr_prison_racct = NULL;
4803 db_show_prison(struct prison *pr)
4805 struct bool_flags *bf;
4806 struct jailsys_flags *jsf;
4807 #if defined(INET) || defined(INET6)
4812 char ip4buf[INET_ADDRSTRLEN];
4815 char ip6buf[INET6_ADDRSTRLEN];
4818 db_printf("prison %p:\n", pr);
4819 db_printf(" jid = %d\n", pr->pr_id);
4820 db_printf(" name = %s\n", pr->pr_name);
4821 db_printf(" parent = %p\n", pr->pr_parent);
4822 db_printf(" ref = %d\n", pr->pr_ref);
4823 db_printf(" uref = %d\n", pr->pr_uref);
4824 db_printf(" state = %s\n",
4825 pr->pr_state == PRISON_STATE_ALIVE ? "alive" :
4826 pr->pr_state == PRISON_STATE_DYING ? "dying" :
4828 db_printf(" path = %s\n", pr->pr_path);
4829 db_printf(" cpuset = %d\n", pr->pr_cpuset
4830 ? pr->pr_cpuset->cs_id : -1);
4832 db_printf(" vnet = %p\n", pr->pr_vnet);
4834 db_printf(" root = %p\n", pr->pr_root);
4835 db_printf(" securelevel = %d\n", pr->pr_securelevel);
4836 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
4837 db_printf(" children.max = %d\n", pr->pr_childmax);
4838 db_printf(" children.cur = %d\n", pr->pr_childcount);
4839 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
4840 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
4841 db_printf(" flags = 0x%x", pr->pr_flags);
4842 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++)
4843 if (pr->pr_flags & bf->flag)
4844 db_printf(" %s", bf->name);
4845 for (jsf = pr_flag_jailsys;
4846 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
4848 f = pr->pr_flags & (jsf->disable | jsf->new);
4849 db_printf(" %-16s= %s\n", jsf->name,
4850 (f != 0 && f == jsf->disable) ? "disable"
4851 : (f == jsf->new) ? "new"
4854 db_printf(" allow = 0x%x", pr->pr_allow);
4855 for (bf = pr_flag_allow;
4856 bf < pr_flag_allow + nitems(pr_flag_allow) &&
4857 atomic_load_int(&bf->flag) != 0;
4859 if (pr->pr_allow & bf->flag)
4860 db_printf(" %s", bf->name);
4862 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
4863 db_printf(" host.hostname = %s\n", pr->pr_hostname);
4864 db_printf(" host.domainname = %s\n", pr->pr_domainname);
4865 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
4866 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
4868 if (pr->pr_addrs[PR_INET] != NULL) {
4869 pr_family_t af = PR_INET;
4871 db_printf(" ip4s = %d\n", pr->pr_addrs[af]->ips);
4872 for (ii = 0; ii < pr->pr_addrs[af]->ips; ii++)
4873 db_printf(" %s %s\n",
4874 ii == 0 ? "ip4.addr =" : " ",
4876 *(const struct in_addr *)PR_IP(pr, ii),
4881 if (pr->pr_addrs[PR_INET6] != NULL) {
4882 pr_family_t af = PR_INET6;
4884 db_printf(" ip6s = %d\n", pr->pr_addrs[af]->ips);
4885 for (ii = 0; ii < pr->pr_addrs[af]->ips; ii++)
4886 db_printf(" %s %s\n",
4887 ii == 0 ? "ip6.addr =" : " ",
4889 (const struct in6_addr *)PR_IP(pr, ii)));
4894 DB_SHOW_COMMAND(prison, db_show_prison_command)
4900 * Show all prisons in the list, and prison0 which is not
4903 db_show_prison(&prison0);
4904 if (!db_pager_quit) {
4905 TAILQ_FOREACH(pr, &allprison, pr_list) {
4917 /* Look for a prison with the ID and with references. */
4918 TAILQ_FOREACH(pr, &allprison, pr_list)
4919 if (pr->pr_id == addr && pr->pr_ref > 0)
4922 /* Look again, without requiring a reference. */
4923 TAILQ_FOREACH(pr, &allprison, pr_list)
4924 if (pr->pr_id == addr)
4927 /* Assume address points to a valid prison. */
4928 pr = (struct prison *)addr;