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/taskqueue.h>
49 #include <sys/fcntl.h>
51 #include <sys/linker.h>
53 #include <sys/mutex.h>
54 #include <sys/racct.h>
56 #include <sys/refcount.h>
58 #include <sys/sysent.h>
59 #include <sys/namei.h>
60 #include <sys/mount.h>
61 #include <sys/queue.h>
62 #include <sys/socket.h>
63 #include <sys/syscallsubr.h>
64 #include <sys/sysctl.h>
66 #include <sys/vnode.h>
71 #include <netinet/in.h>
77 #include <security/mac/mac_framework.h>
79 #define PRISON0_HOSTUUID_MODULE "hostuuid"
81 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
82 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures");
84 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */
87 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
89 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
93 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
95 #define _PR_IP_SADDRSEL 0
99 /* prison0 describes what is "real" about the system. */
100 struct prison prison0 = {
106 .pr_securelevel = -1,
108 .pr_state = PRISON_STATE_ALIVE,
109 .pr_childmax = JAIL_MAX,
110 .pr_hostuuid = DEFAULT_HOSTUUID,
111 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
113 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
115 .pr_flags = PR_HOST|_PR_IP_SADDRSEL,
117 .pr_allow = PR_ALLOW_ALL_STATIC,
119 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
126 struct jailsys_flags {
132 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */
133 struct sx allprison_lock;
134 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
135 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
136 LIST_HEAD(, prison_racct) allprison_racct;
139 static int get_next_prid(struct prison **insprp);
140 static int do_jail_attach(struct thread *td, struct prison *pr, int drflags);
141 static void prison_complete(void *context, int pending);
142 static void prison_deref(struct prison *pr, int flags);
143 static void prison_deref_kill(struct prison *pr, struct prisonlist *freeprison);
144 static int prison_lock_xlock(struct prison *pr, int flags);
145 static void prison_free_not_last(struct prison *pr);
146 static void prison_proc_free_not_last(struct prison *pr);
147 static void prison_set_allow_locked(struct prison *pr, unsigned flag,
149 static char *prison_path(struct prison *pr1, struct prison *pr2);
151 static void prison_racct_attach(struct prison *pr);
152 static void prison_racct_modify(struct prison *pr);
153 static void prison_racct_detach(struct prison *pr);
156 /* Flags for prison_deref */
157 #define PD_DEREF 0x01 /* Decrement pr_ref */
158 #define PD_DEUREF 0x02 /* Decrement pr_uref */
159 #define PD_KILL 0x04 /* Remove jail, kill processes, etc */
160 #define PD_LOCKED 0x10 /* pr_mtx is held */
161 #define PD_LIST_SLOCKED 0x20 /* allprison_lock is held shared */
162 #define PD_LIST_XLOCKED 0x40 /* allprison_lock is held exclusive */
163 #define PD_OP_FLAGS 0x07 /* Operation flags */
164 #define PD_LOCK_FLAGS 0x70 /* Lock status flags */
167 * Parameter names corresponding to PR_* flag values. Size values are for kvm
168 * as we cannot figure out the size of a sparse array, or an array without a
171 static struct bool_flags pr_flag_bool[] = {
172 {"persist", "nopersist", PR_PERSIST},
174 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL},
177 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL},
180 const size_t pr_flag_bool_size = sizeof(pr_flag_bool);
182 static struct jailsys_flags pr_flag_jailsys[] = {
183 {"host", 0, PR_HOST},
185 {"vnet", 0, PR_VNET},
188 {"ip4", PR_IP4_USER, PR_IP4_USER},
191 {"ip6", PR_IP6_USER, PR_IP6_USER},
194 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
197 * Make this array full-size so dynamic parameters can be added.
198 * It is protected by prison0.mtx, but lockless reading is allowed
199 * with an atomic check of the flag values.
201 static struct bool_flags pr_flag_allow[NBBY * NBPW] = {
202 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME},
203 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC},
204 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS},
205 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS},
206 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT},
207 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS},
208 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF},
209 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK},
210 {"allow.reserved_ports", "allow.noreserved_ports",
211 PR_ALLOW_RESERVED_PORTS},
212 {"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF},
213 {"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug",
214 PR_ALLOW_UNPRIV_DEBUG},
215 {"allow.suser", "allow.nosuser", PR_ALLOW_SUSER},
217 static unsigned pr_allow_all = PR_ALLOW_ALL_STATIC;
218 const size_t pr_flag_allow_size = sizeof(pr_flag_allow);
220 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \
221 PR_ALLOW_RESERVED_PORTS | \
222 PR_ALLOW_UNPRIV_DEBUG | \
224 #define JAIL_DEFAULT_ENFORCE_STATFS 2
225 #define JAIL_DEFAULT_DEVFS_RSNUM 0
226 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
227 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
228 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
229 #if defined(INET) || defined(INET6)
230 static unsigned jail_max_af_ips = 255;
234 * Initialize the parts of prison0 that can't be static-initialized with
235 * constants. This is called from proc0_init() after creating thread0 cpuset.
240 uint8_t *file, *data;
243 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset);
244 prison0.pr_osreldate = osreldate;
245 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease));
247 /* If we have a preloaded hostuuid, use it. */
248 file = preload_search_by_type(PRISON0_HOSTUUID_MODULE);
250 data = preload_fetch_addr(file);
251 size = preload_fetch_size(file);
254 * The preloaded data may include trailing whitespace, almost
255 * certainly a newline; skip over any whitespace or
256 * non-printable characters to be safe.
258 while (size > 0 && data[size - 1] <= 0x20) {
261 if (validate_uuid(data, size, NULL, 0) == 0) {
262 (void)strlcpy(prison0.pr_hostuuid, data,
264 } else if (bootverbose) {
265 printf("hostuuid: preload data malformed: '%.*s'\n",
271 printf("hostuuid: using %s\n", prison0.pr_hostuuid);
280 sys_jail(struct thread *td, struct jail_args *uap)
286 error = copyin(uap->jail, &version, sizeof(uint32_t));
295 /* FreeBSD single IPv4 jails. */
296 bzero(&j, sizeof(struct jail));
297 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
300 j.version = j0.version;
302 j.hostname = j0.hostname;
303 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */
309 * Version 1 was used by multi-IPv4 jail implementations
310 * that never made it into the official kernel.
314 case 2: /* JAIL_API_VERSION */
315 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
316 error = copyin(uap->jail, &j, sizeof(struct jail));
322 /* Sci-Fi jails are not supported, sorry. */
325 return (kern_jail(td, &j));
329 kern_jail(struct thread *td, struct jail *j)
331 struct iovec optiov[2 * (4 + nitems(pr_flag_allow)
340 char *u_path, *u_hostname, *u_name;
341 struct bool_flags *bf;
344 struct in_addr *u_ip4;
347 struct in6_addr *u_ip6;
350 int error, enforce_statfs;
352 bzero(&optiov, sizeof(optiov));
353 opt.uio_iov = optiov;
357 opt.uio_segflg = UIO_SYSSPACE;
358 opt.uio_rw = UIO_READ;
361 /* Set permissions for top-level jails from sysctls. */
362 if (!jailed(td->td_ucred)) {
363 for (bf = pr_flag_allow;
364 bf < pr_flag_allow + nitems(pr_flag_allow) &&
365 atomic_load_int(&bf->flag) != 0;
367 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *,
368 (jail_default_allow & bf->flag)
369 ? bf->name : bf->noname);
370 optiov[opt.uio_iovcnt].iov_len =
371 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
374 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
375 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
377 enforce_statfs = jail_default_enforce_statfs;
378 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
379 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
383 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
385 ip4s = (j->version == 0) ? 1 : j->ip4s;
386 if (ip4s > jail_max_af_ips)
388 tmplen += ip4s * sizeof(struct in_addr);
394 if (j->ip6s > jail_max_af_ips)
396 tmplen += j->ip6s * sizeof(struct in6_addr);
401 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
402 u_hostname = u_path + MAXPATHLEN;
403 u_name = u_hostname + MAXHOSTNAMELEN;
405 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
409 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
411 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
414 optiov[opt.uio_iovcnt].iov_base = "path";
415 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
417 optiov[opt.uio_iovcnt].iov_base = u_path;
418 error = copyinstr(j->path, u_path, MAXPATHLEN,
419 &optiov[opt.uio_iovcnt].iov_len);
421 free(u_path, M_TEMP);
425 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
426 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
428 optiov[opt.uio_iovcnt].iov_base = u_hostname;
429 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
430 &optiov[opt.uio_iovcnt].iov_len);
432 free(u_path, M_TEMP);
436 if (j->jailname != NULL) {
437 optiov[opt.uio_iovcnt].iov_base = "name";
438 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
440 optiov[opt.uio_iovcnt].iov_base = u_name;
441 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
442 &optiov[opt.uio_iovcnt].iov_len);
444 free(u_path, M_TEMP);
450 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
451 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
453 optiov[opt.uio_iovcnt].iov_base = u_ip4;
454 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
456 u_ip4->s_addr = j->ip4s;
458 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
460 free(u_path, M_TEMP);
467 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
468 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
470 optiov[opt.uio_iovcnt].iov_base = u_ip6;
471 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
472 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
474 free(u_path, M_TEMP);
479 KASSERT(opt.uio_iovcnt <= nitems(optiov),
480 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
481 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
482 free(u_path, M_TEMP);
487 * struct jail_set_args {
488 * struct iovec *iovp;
489 * unsigned int iovcnt;
494 sys_jail_set(struct thread *td, struct jail_set_args *uap)
499 /* Check that we have an even number of iovecs. */
503 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
506 error = kern_jail_set(td, auio, uap->flags);
512 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
519 struct in6_addr *ip6;
522 struct vfsoptlist *opts;
523 struct prison *pr, *deadpr, *inspr, *mypr, *ppr, *tpr;
525 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
526 char *g_path, *osrelstr;
527 struct bool_flags *bf;
528 struct jailsys_flags *jsf;
529 #if defined(INET) || defined(INET6)
534 size_t namelen, onamelen, pnamelen;
535 int born, created, cuflags, descend, drflags, enforce;
536 int error, errmsg_len, errmsg_pos;
537 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
538 int jid, jsys, len, level;
539 int childmax, osreldt, rsnum, slevel;
540 #if defined(INET) || defined(INET6)
549 uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
550 uint64_t pr_allow_diff;
554 error = priv_check(td, PRIV_JAIL_SET);
555 if (!error && (flags & JAIL_ATTACH))
556 error = priv_check(td, PRIV_JAIL_ATTACH);
559 mypr = td->td_ucred->cr_prison;
560 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
562 if (flags & ~JAIL_SET_MASK)
566 * Check all the parameters before committing to anything. Not all
567 * errors can be caught early, but we may as well try. Also, this
568 * takes care of some expensive stuff (path lookup) before getting
569 * the allprison lock.
571 * XXX Jails are not filesystems, and jail parameters are not mount
572 * options. But it makes more sense to re-use the vfsopt code
573 * than duplicate it under a different name.
575 error = vfs_buildopts(optuio, &opts);
586 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
589 vfs_opterror(opts, "no valid operation (create or update)");
593 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
599 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
608 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
616 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
621 else if (enforce < 0 || enforce > 2) {
627 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
635 pr_flags = ch_flags = 0;
636 for (bf = pr_flag_bool;
637 bf < pr_flag_bool + nitems(pr_flag_bool);
639 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag);
640 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag);
642 ch_flags |= pr_flags;
643 for (jsf = pr_flag_jailsys;
644 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
646 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys));
652 case JAIL_SYS_DISABLE:
657 pr_flags |= jsf->disable;
660 pr_flags |= jsf->new;
662 case JAIL_SYS_INHERIT:
668 ch_flags |= jsf->new | jsf->disable;
670 if ((flags & (JAIL_CREATE | JAIL_ATTACH)) == JAIL_CREATE
671 && !(pr_flags & PR_PERSIST)) {
673 vfs_opterror(opts, "new jail must persist or attach");
677 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
679 vfs_opterror(opts, "vnet cannot be changed after creation");
684 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
686 vfs_opterror(opts, "ip4 cannot be changed after creation");
691 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
693 vfs_opterror(opts, "ip6 cannot be changed after creation");
698 pr_allow = ch_allow = 0;
699 for (bf = pr_flag_allow;
700 bf < pr_flag_allow + nitems(pr_flag_allow) &&
701 atomic_load_int(&bf->flag) != 0;
703 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag);
704 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag);
706 ch_allow |= pr_allow;
708 error = vfs_getopt(opts, "name", (void **)&name, &len);
714 if (len == 0 || name[len - 1] != '\0') {
718 if (len > MAXHOSTNAMELEN) {
719 error = ENAMETOOLONG;
724 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
732 if (len == 0 || host[len - 1] != '\0') {
736 if (len > MAXHOSTNAMELEN) {
737 error = ENAMETOOLONG;
742 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
750 if (len == 0 || domain[len - 1] != '\0') {
754 if (len > MAXHOSTNAMELEN) {
755 error = ENAMETOOLONG;
760 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
768 if (len == 0 || uuid[len - 1] != '\0') {
772 if (len > HOSTUUIDLEN) {
773 error = ENAMETOOLONG;
778 #ifdef COMPAT_FREEBSD32
779 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
782 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
786 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
798 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
803 else if (ip4s & (sizeof(*ip4) - 1)) {
807 ch_flags |= PR_IP4_USER;
808 pr_flags |= PR_IP4_USER;
810 ip4s /= sizeof(*ip4);
811 if (ip4s > jail_max_af_ips) {
813 vfs_opterror(opts, "too many IPv4 addresses");
816 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
817 bcopy(op, ip4, ip4s * sizeof(*ip4));
819 * IP addresses are all sorted but ip[0] to preserve
820 * the primary IP address as given from userland.
821 * This special IP is used for unbound outgoing
822 * connections as well for "loopback" traffic in case
823 * source address selection cannot find any more fitting
824 * address to connect from.
827 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4),
830 * Check for duplicate addresses and do some simple
831 * zero and broadcast checks. If users give other bogus
832 * addresses it is their problem.
834 * We do not have to care about byte order for these
835 * checks so we will do them in NBO.
837 for (ii = 0; ii < ip4s; ii++) {
838 if (ip4[ii].s_addr == INADDR_ANY ||
839 ip4[ii].s_addr == INADDR_BROADCAST) {
844 (ip4[0].s_addr == ip4[ii+1].s_addr ||
845 ip4[ii].s_addr == ip4[ii+1].s_addr)) {
855 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
860 else if (ip6s & (sizeof(*ip6) - 1)) {
864 ch_flags |= PR_IP6_USER;
865 pr_flags |= PR_IP6_USER;
867 ip6s /= sizeof(*ip6);
868 if (ip6s > jail_max_af_ips) {
870 vfs_opterror(opts, "too many IPv6 addresses");
873 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
874 bcopy(op, ip6, ip6s * sizeof(*ip6));
876 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6),
878 for (ii = 0; ii < ip6s; ii++) {
879 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
884 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
885 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
895 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
896 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
899 "vnet jails cannot have IP address restrictions");
904 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len);
910 if (flags & JAIL_UPDATE) {
913 "osrelease cannot be changed after creation");
916 if (len == 0 || osrelstr[len - 1] != '\0') {
920 if (len >= OSRELEASELEN) {
921 error = ENAMETOOLONG;
923 "osrelease string must be 1-%d bytes long",
929 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt));
935 if (flags & JAIL_UPDATE) {
938 "osreldate cannot be changed after creation");
943 vfs_opterror(opts, "osreldate cannot be 0");
949 error = vfs_getopt(opts, "path", (void **)&path, &len);
955 if (flags & JAIL_UPDATE) {
958 "path cannot be changed after creation");
961 if (len == 0 || path[len - 1] != '\0') {
965 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
971 NDFREE(&nd, NDF_ONLY_PNBUF);
972 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
973 strlcpy(g_path, path, MAXPATHLEN);
974 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
978 /* exit on other errors */
981 if (root->v_type != VDIR) {
990 * Find the specified jail, or at least its parent.
991 * This abuses the file error codes ENOENT and EEXIST.
995 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
996 namelc = strrchr(name, '.');
997 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
1001 sx_xlock(&allprison_lock);
1002 drflags = PD_LIST_XLOCKED;
1004 if (!prison_isalive(ppr)) {
1005 /* This jail is dying. This process will surely follow. */
1012 vfs_opterror(opts, "negative jid");
1016 * See if a requested jid already exists. Keep track of
1017 * where it can be inserted later.
1019 TAILQ_FOREACH(inspr, &allprison, pr_list) {
1020 if (inspr->pr_id < jid)
1022 if (inspr->pr_id > jid)
1025 mtx_lock(&pr->pr_mtx);
1026 drflags |= PD_LOCKED;
1031 /* Create: jid must not exist. */
1032 if (cuflags == JAIL_CREATE) {
1034 * Even creators that cannot see the jail will
1038 vfs_opterror(opts, "jail %d already exists",
1042 if (!prison_ischild(mypr, pr)) {
1044 * Updaters get ENOENT if they cannot see the
1045 * jail. This is true even for CREATE | UPDATE,
1046 * which normally cannot give this error.
1049 vfs_opterror(opts, "jail %d not found", jid);
1052 ppr = pr->pr_parent;
1053 if (!prison_isalive(ppr)) {
1055 vfs_opterror(opts, "jail %d is dying",
1059 if (!prison_isalive(pr)) {
1060 if (!(flags & JAIL_DYING)) {
1062 vfs_opterror(opts, "jail %d is dying",
1066 if ((flags & JAIL_ATTACH) ||
1067 (pr_flags & PR_PERSIST)) {
1069 * A dying jail might be resurrected
1070 * (via attach or persist), but first
1071 * it must determine if another jail
1072 * has claimed its name. Accomplish
1073 * this by implicitly re-setting the
1077 name = prison_name(mypr, pr);
1081 /* Update: jid must exist. */
1082 if (cuflags == JAIL_UPDATE) {
1084 vfs_opterror(opts, "jail %d not found", jid);
1090 * If the caller provided a name, look for a jail by that name.
1091 * This has different semantics for creates and updates keyed by jid
1092 * (where the name must not already exist in a different jail),
1093 * and updates keyed by the name itself (where the name must exist
1094 * because that is the jail being updated).
1098 namelc = strrchr(name, '.');
1103 * This is a hierarchical name. Split it into the
1104 * parent and child names, and make sure the parent
1105 * exists or matches an already found jail.
1108 if (strncmp(name, ppr->pr_name, namelc - name)
1109 || ppr->pr_name[namelc - name] != '\0') {
1112 "cannot change jail's parent");
1117 ppr = prison_find_name(mypr, name);
1121 "jail \"%s\" not found", name);
1124 mtx_unlock(&ppr->pr_mtx);
1125 if (!prison_isalive(ppr)) {
1128 "jail \"%s\" is dying", name);
1135 if (namelc[0] != '\0') {
1137 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1139 FOREACH_PRISON_CHILD(ppr, tpr) {
1141 !strcmp(tpr->pr_name + pnamelen, namelc)) {
1142 if (prison_isalive(tpr)) {
1144 cuflags != JAIL_CREATE) {
1150 mtx_lock(&pr->pr_mtx);
1151 drflags |= PD_LOCKED;
1155 * Create, or update(jid):
1156 * name must not exist in an
1157 * active sibling jail.
1161 "jail \"%s\" already exists",
1166 cuflags != JAIL_CREATE) {
1171 /* If no active jail is found, use a dying one. */
1172 if (deadpr != NULL && pr == NULL) {
1173 if (flags & JAIL_DYING) {
1175 mtx_lock(&pr->pr_mtx);
1176 drflags |= PD_LOCKED;
1177 } else if (cuflags == JAIL_UPDATE) {
1180 "jail \"%s\" is dying", name);
1184 /* Update: name must exist if no jid. */
1185 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1187 vfs_opterror(opts, "jail \"%s\" not found",
1193 /* Update: must provide a jid or name. */
1194 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1196 vfs_opterror(opts, "update specified no jail");
1200 /* If there's no prison to update, create a new one and link it in. */
1201 created = pr == NULL;
1203 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1204 if (tpr->pr_childcount >= tpr->pr_childmax) {
1206 vfs_opterror(opts, "prison limit exceeded");
1209 if (jid == 0 && (jid = get_next_prid(&inspr)) == 0) {
1211 vfs_opterror(opts, "no available jail IDs");
1215 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1216 pr->pr_state = PRISON_STATE_INVALID;
1217 refcount_init(&pr->pr_ref, 1);
1218 refcount_init(&pr->pr_uref, 0);
1219 drflags |= PD_DEREF;
1220 LIST_INIT(&pr->pr_children);
1221 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1222 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
1226 TAILQ_INSERT_BEFORE(inspr, pr, pr_list);
1228 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1230 pr->pr_parent = ppr;
1232 prison_proc_hold(ppr);
1233 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1234 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1235 tpr->pr_childcount++;
1237 /* Set some default values, and inherit some from the parent. */
1242 root = mypr->pr_root;
1245 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1246 pr->pr_flags |= PR_HOST;
1247 #if defined(INET) || defined(INET6)
1249 if (!(pr_flags & PR_VNET))
1253 if (!(ch_flags & PR_IP4_USER))
1254 pr->pr_flags |= PR_IP4 | PR_IP4_USER;
1255 else if (!(pr_flags & PR_IP4_USER)) {
1256 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1257 if (ppr->pr_ip4 != NULL) {
1258 pr->pr_ip4s = ppr->pr_ip4s;
1259 pr->pr_ip4 = malloc(pr->pr_ip4s *
1260 sizeof(struct in_addr), M_PRISON,
1262 bcopy(ppr->pr_ip4, pr->pr_ip4,
1263 pr->pr_ip4s * sizeof(*pr->pr_ip4));
1268 if (!(ch_flags & PR_IP6_USER))
1269 pr->pr_flags |= PR_IP6 | PR_IP6_USER;
1270 else if (!(pr_flags & PR_IP6_USER)) {
1271 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1272 if (ppr->pr_ip6 != NULL) {
1273 pr->pr_ip6s = ppr->pr_ip6s;
1274 pr->pr_ip6 = malloc(pr->pr_ip6s *
1275 sizeof(struct in6_addr), M_PRISON,
1277 bcopy(ppr->pr_ip6, pr->pr_ip6,
1278 pr->pr_ip6s * sizeof(*pr->pr_ip6));
1284 /* Source address selection is always on by default. */
1285 pr->pr_flags |= _PR_IP_SADDRSEL;
1287 pr->pr_securelevel = ppr->pr_securelevel;
1288 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1289 pr->pr_enforce_statfs = jail_default_enforce_statfs;
1290 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
1292 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate;
1293 if (osrelstr == NULL)
1294 strlcpy(pr->pr_osrelease, ppr->pr_osrelease,
1295 sizeof(pr->pr_osrelease));
1297 strlcpy(pr->pr_osrelease, osrelstr,
1298 sizeof(pr->pr_osrelease));
1301 /* Allocate a new vnet if specified. */
1302 pr->pr_vnet = (pr_flags & PR_VNET)
1303 ? vnet_alloc() : ppr->pr_vnet;
1306 * Allocate a dedicated cpuset for each jail.
1307 * Unlike other initial settings, this may return an error.
1309 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1313 mtx_lock(&pr->pr_mtx);
1314 drflags |= PD_LOCKED;
1317 * Grab a reference for existing prisons, to ensure they
1318 * continue to exist for the duration of the call.
1321 drflags |= PD_DEREF;
1322 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1323 if ((pr->pr_flags & PR_VNET) &&
1324 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1327 "vnet jails cannot have IP address restrictions");
1332 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1335 "ip4 cannot be changed after creation");
1340 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1343 "ip6 cannot be changed after creation");
1349 /* Do final error checking before setting anything. */
1351 if (slevel < ppr->pr_securelevel) {
1357 if (childmax >= ppr->pr_childmax) {
1363 if (enforce < ppr->pr_enforce_statfs) {
1370 * devfs_rsnum is a uint16_t
1372 if (rsnum < 0 || rsnum > 65535) {
1377 * Nested jails always inherit parent's devfs ruleset
1379 if (jailed(td->td_ucred)) {
1380 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
1384 rsnum = ppr->pr_devfs_rsnum;
1389 if (ppr->pr_flags & PR_IP4) {
1391 * Make sure the new set of IP addresses is a
1392 * subset of the parent's list. Don't worry
1393 * about the parent being unlocked, as any
1394 * setting is done with allprison_lock held.
1396 for (ij = 0; ij < ppr->pr_ip4s; ij++)
1397 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
1399 if (ij == ppr->pr_ip4s) {
1404 for (ii = ij = 1; ii < ip4s; ii++) {
1405 if (ip4[ii].s_addr ==
1406 ppr->pr_ip4[0].s_addr)
1408 for (; ij < ppr->pr_ip4s; ij++)
1409 if (ip4[ii].s_addr ==
1410 ppr->pr_ip4[ij].s_addr)
1412 if (ij == ppr->pr_ip4s)
1415 if (ij == ppr->pr_ip4s) {
1422 * Check for conflicting IP addresses. We permit them
1423 * if there is no more than one IP on each jail. If
1424 * there is a duplicate on a jail with more than one
1425 * IP stop checking and return error.
1428 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent)
1429 if (tppr->pr_flags & PR_VNET)
1434 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1437 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1439 !prison_isalive(tpr)) {
1443 if (!(tpr->pr_flags & PR_IP4_USER))
1446 if (tpr->pr_ip4 == NULL ||
1447 (ip4s == 1 && tpr->pr_ip4s == 1))
1449 for (ii = 0; ii < ip4s; ii++) {
1450 if (prison_check_ip4_locked(tpr, &ip4[ii]) ==
1454 "IPv4 addresses clash");
1463 if (ppr->pr_flags & PR_IP6) {
1465 * Make sure the new set of IP addresses is a
1466 * subset of the parent's list.
1468 for (ij = 0; ij < ppr->pr_ip6s; ij++)
1469 if (IN6_ARE_ADDR_EQUAL(&ip6[0],
1472 if (ij == ppr->pr_ip6s) {
1477 for (ii = ij = 1; ii < ip6s; ii++) {
1478 if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
1481 for (; ij < ppr->pr_ip6s; ij++)
1482 if (IN6_ARE_ADDR_EQUAL(
1483 &ip6[ii], &ppr->pr_ip6[ij]))
1485 if (ij == ppr->pr_ip6s)
1488 if (ij == ppr->pr_ip6s) {
1494 /* Check for conflicting IP addresses. */
1496 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent)
1497 if (tppr->pr_flags & PR_VNET)
1502 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1505 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1507 !prison_isalive(tpr)) {
1511 if (!(tpr->pr_flags & PR_IP6_USER))
1514 if (tpr->pr_ip6 == NULL ||
1515 (ip6s == 1 && tpr->pr_ip6s == 1))
1517 for (ii = 0; ii < ip6s; ii++) {
1518 if (prison_check_ip6_locked(tpr, &ip6[ii]) ==
1522 "IPv6 addresses clash");
1529 onamelen = namelen = 0;
1530 if (namelc != NULL) {
1531 /* Give a default name of the jid. Also allow the name to be
1532 * explicitly the jid - but not any other number, and only in
1533 * normal form (no leading zero/etc).
1535 if (namelc[0] == '\0')
1536 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid);
1537 else if ((strtoul(namelc, &p, 10) != jid ||
1538 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') {
1541 "name cannot be numeric (unless it is the jid)");
1545 * Make sure the name isn't too long for the prison or its
1548 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1549 onamelen = strlen(pr->pr_name + pnamelen);
1550 namelen = strlen(namelc);
1551 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) {
1552 error = ENAMETOOLONG;
1555 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1556 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
1557 sizeof(pr->pr_name)) {
1558 error = ENAMETOOLONG;
1563 pr_allow_diff = pr_allow & ~ppr->pr_allow;
1564 if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) {
1570 * Let modules check their parameters. This requires unlocking and
1571 * then re-locking the prison, but this is still a valid state as long
1572 * as allprison_lock remains xlocked.
1574 mtx_unlock(&pr->pr_mtx);
1575 drflags &= ~PD_LOCKED;
1576 error = osd_jail_call(pr, PR_METHOD_CHECK, opts);
1579 mtx_lock(&pr->pr_mtx);
1580 drflags |= PD_LOCKED;
1582 /* At this point, all valid parameters should have been noted. */
1583 TAILQ_FOREACH(opt, opts, link) {
1584 if (!opt->seen && strcmp(opt->name, "errmsg")) {
1586 vfs_opterror(opts, "unknown parameter: %s", opt->name);
1591 /* Set the parameters of the prison. */
1594 if (pr_flags & PR_IP4_USER) {
1595 pr->pr_flags |= PR_IP4;
1596 free(pr->pr_ip4, M_PRISON);
1600 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1602 if (tpr->pr_flags & PR_VNET) {
1607 if (prison_restrict_ip4(tpr, NULL)) {
1616 if (pr_flags & PR_IP6_USER) {
1617 pr->pr_flags |= PR_IP6;
1618 free(pr->pr_ip6, M_PRISON);
1622 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1624 if (tpr->pr_flags & PR_VNET) {
1629 if (prison_restrict_ip6(tpr, NULL)) {
1637 pr->pr_securelevel = slevel;
1638 /* Set all child jails to be at least this level. */
1639 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1640 if (tpr->pr_securelevel < slevel)
1641 tpr->pr_securelevel = slevel;
1644 pr->pr_childmax = childmax;
1645 /* Set all child jails to under this limit. */
1646 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
1647 if (tpr->pr_childmax > childmax - level)
1648 tpr->pr_childmax = childmax > level
1649 ? childmax - level : 0;
1652 pr->pr_enforce_statfs = enforce;
1653 /* Pass this restriction on to the children. */
1654 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1655 if (tpr->pr_enforce_statfs < enforce)
1656 tpr->pr_enforce_statfs = enforce;
1659 pr->pr_devfs_rsnum = rsnum;
1660 /* Pass this restriction on to the children. */
1661 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1662 tpr->pr_devfs_rsnum = rsnum;
1664 if (namelc != NULL) {
1665 if (ppr == &prison0)
1666 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name));
1668 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
1669 ppr->pr_name, namelc);
1670 /* Change this component of child names. */
1671 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1672 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
1673 strlen(tpr->pr_name + onamelen) + 1);
1674 bcopy(pr->pr_name, tpr->pr_name, namelen);
1678 /* Try to keep a real-rooted full pathname. */
1679 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
1683 if (PR_HOST & ch_flags & ~pr_flags) {
1684 if (pr->pr_flags & PR_HOST) {
1686 * Copy the parent's host info. As with pr_ip4 above,
1687 * the lack of a lock on the parent is not a problem;
1688 * it is always set with allprison_lock at least
1689 * shared, and is held exclusively here.
1691 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
1692 sizeof(pr->pr_hostname));
1693 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
1694 sizeof(pr->pr_domainname));
1695 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
1696 sizeof(pr->pr_hostuuid));
1697 pr->pr_hostid = pr->pr_parent->pr_hostid;
1699 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
1700 /* Set this prison, and any descendants without PR_HOST. */
1702 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
1704 strlcpy(pr->pr_domainname, domain,
1705 sizeof(pr->pr_domainname));
1707 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
1709 pr->pr_hostid = hid;
1710 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1711 if (tpr->pr_flags & PR_HOST)
1715 strlcpy(tpr->pr_hostname,
1717 sizeof(tpr->pr_hostname));
1719 strlcpy(tpr->pr_domainname,
1721 sizeof(tpr->pr_domainname));
1723 strlcpy(tpr->pr_hostuuid,
1725 sizeof(tpr->pr_hostuuid));
1727 tpr->pr_hostid = hid;
1731 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
1732 if ((tallow = ch_allow & ~pr_allow))
1733 prison_set_allow_locked(pr, tallow, 0);
1735 * Persistent prisons get an extra reference, and prisons losing their
1736 * persist flag lose that reference.
1738 born = !prison_isalive(pr);
1739 if (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags)) {
1740 if (pr_flags & PR_PERSIST) {
1743 * This may make a dead prison alive again, but wait
1744 * to label it as such until after OSD calls have had
1745 * a chance to run (and perhaps to fail).
1747 refcount_acquire(&pr->pr_uref);
1749 drflags |= PD_DEUREF;
1750 prison_free_not_last(pr);
1753 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
1754 mtx_unlock(&pr->pr_mtx);
1755 drflags &= ~PD_LOCKED;
1757 * Any errors past this point will need to de-persist newly created
1758 * prisons, as well as call remove methods.
1764 if (racct_enable && created)
1765 prison_racct_attach(pr);
1768 /* Locks may have prevented a complete restriction of child IP
1769 * addresses. If so, allocate some more memory and try again.
1774 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
1775 mtx_lock(&pr->pr_mtx);
1777 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1779 if (tpr->pr_flags & PR_VNET) {
1784 if (prison_restrict_ip4(tpr, ip4)) {
1791 mtx_unlock(&pr->pr_mtx);
1797 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
1798 mtx_lock(&pr->pr_mtx);
1800 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1802 if (tpr->pr_flags & PR_VNET) {
1807 if (prison_restrict_ip6(tpr, ip6)) {
1814 mtx_unlock(&pr->pr_mtx);
1818 /* Let the modules do their work. */
1820 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
1824 error = osd_jail_call(pr, PR_METHOD_SET, opts);
1829 * A new prison is now ready to be seen; either it has gained a user
1830 * reference via persistence, or is about to gain one via attachment.
1833 drflags = prison_lock_xlock(pr, drflags);
1834 pr->pr_state = PRISON_STATE_ALIVE;
1837 /* Attach this process to the prison if requested. */
1838 if (flags & JAIL_ATTACH) {
1839 error = do_jail_attach(td, pr,
1840 prison_lock_xlock(pr, drflags & PD_LOCK_FLAGS));
1841 drflags &= ~(PD_LOCKED | PD_LIST_XLOCKED);
1843 vfs_opterror(opts, "attach failed");
1849 if (racct_enable && !created) {
1850 if (drflags & PD_LOCKED) {
1851 mtx_unlock(&pr->pr_mtx);
1852 drflags &= ~PD_LOCKED;
1854 if (drflags & PD_LIST_XLOCKED) {
1855 sx_xunlock(&allprison_lock);
1856 drflags &= ~PD_LIST_XLOCKED;
1858 prison_racct_modify(pr);
1862 drflags &= ~PD_KILL;
1863 td->td_retval[0] = pr->pr_id;
1866 /* Release any temporary prison holds and/or locks. */
1868 prison_deref(pr, drflags);
1869 else if (drflags & PD_LIST_SLOCKED)
1870 sx_sunlock(&allprison_lock);
1871 else if (drflags & PD_LIST_XLOCKED)
1872 sx_xunlock(&allprison_lock);
1877 /* Write the error message back to userspace. */
1878 if (vfs_getopt(opts, "errmsg", (void **)&errmsg,
1879 &errmsg_len) == 0 && errmsg_len > 0) {
1880 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
1881 if (optuio->uio_segflg == UIO_SYSSPACE)
1883 optuio->uio_iov[errmsg_pos].iov_base,
1887 optuio->uio_iov[errmsg_pos].iov_base,
1893 free(ip4, M_PRISON);
1896 free(ip6, M_PRISON);
1899 free(g_path, M_TEMP);
1905 * Find the next available prison ID. Return the ID on success, or zero
1906 * on failure. Also set a pointer to the allprison list entry the prison
1907 * should be inserted before.
1910 get_next_prid(struct prison **insprp)
1912 struct prison *inspr;
1915 jid = lastprid % JAIL_MAX + 1;
1916 if (TAILQ_EMPTY(&allprison) ||
1917 TAILQ_LAST(&allprison, prisonlist)->pr_id < jid) {
1919 * A common case is for all jails to be implicitly numbered,
1920 * which means they'll go on the end of the list, at least
1921 * for the first JAIL_MAX times.
1926 * Take two passes through the allprison list: first starting
1927 * with the proposed jid, then ending with it.
1929 for (maxid = JAIL_MAX; maxid != 0; ) {
1930 TAILQ_FOREACH(inspr, &allprison, pr_list) {
1931 if (inspr->pr_id < jid)
1933 if (inspr->pr_id > jid) {
1934 /* Found an opening. */
1938 if (++jid > maxid) {
1939 if (lastprid == maxid || lastprid == 0)
1942 * The entire legal range
1943 * has been traversed
1947 /* Try again from the start. */
1953 if (inspr == NULL) {
1954 /* Found room at the end of the list. */
1965 * struct jail_get_args {
1966 * struct iovec *iovp;
1967 * unsigned int iovcnt;
1972 sys_jail_get(struct thread *td, struct jail_get_args *uap)
1977 /* Check that we have an even number of iovecs. */
1978 if (uap->iovcnt & 1)
1981 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
1984 error = kern_jail_get(td, auio, uap->flags);
1986 error = copyout(auio->uio_iov, uap->iovp,
1987 uap->iovcnt * sizeof (struct iovec));
1993 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
1995 struct bool_flags *bf;
1996 struct jailsys_flags *jsf;
1997 struct prison *pr, *mypr;
1999 struct vfsoptlist *opts;
2000 char *errmsg, *name;
2001 int drflags, error, errmsg_len, errmsg_pos, i, jid, len, pos;
2004 if (flags & ~JAIL_GET_MASK)
2007 /* Get the parameter list. */
2008 error = vfs_buildopts(optuio, &opts);
2011 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
2012 mypr = td->td_ucred->cr_prison;
2016 * Find the prison specified by one of: lastjid, jid, name.
2018 sx_slock(&allprison_lock);
2019 drflags = PD_LIST_SLOCKED;
2020 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
2022 TAILQ_FOREACH(pr, &allprison, pr_list) {
2023 if (pr->pr_id > jid &&
2024 ((flags & JAIL_DYING) || prison_isalive(pr)) &&
2025 prison_ischild(mypr, pr)) {
2026 mtx_lock(&pr->pr_mtx);
2027 drflags |= PD_LOCKED;
2032 vfs_opterror(opts, "no jail after %d", jid);
2034 } else if (error != ENOENT)
2037 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
2040 pr = prison_find_child(mypr, jid);
2042 drflags |= PD_LOCKED;
2043 if (!(prison_isalive(pr) ||
2044 (flags & JAIL_DYING))) {
2046 vfs_opterror(opts, "jail %d is dying",
2053 vfs_opterror(opts, "jail %d not found", jid);
2056 } else if (error != ENOENT)
2059 error = vfs_getopt(opts, "name", (void **)&name, &len);
2061 if (len == 0 || name[len - 1] != '\0') {
2065 pr = prison_find_name(mypr, name);
2067 drflags |= PD_LOCKED;
2068 if (!(prison_isalive(pr) || (flags & JAIL_DYING))) {
2070 vfs_opterror(opts, "jail \"%s\" is dying",
2077 vfs_opterror(opts, "jail \"%s\" not found", name);
2079 } else if (error != ENOENT)
2082 vfs_opterror(opts, "no jail specified");
2087 /* Get the parameters of the prison. */
2089 drflags |= PD_DEREF;
2090 td->td_retval[0] = pr->pr_id;
2091 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
2092 if (error != 0 && error != ENOENT)
2094 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
2095 error = vfs_setopt(opts, "parent", &i, sizeof(i));
2096 if (error != 0 && error != ENOENT)
2098 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
2099 if (error != 0 && error != ENOENT)
2101 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
2102 sizeof(pr->pr_cpuset->cs_id));
2103 if (error != 0 && error != ENOENT)
2105 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
2106 if (error != 0 && error != ENOENT)
2109 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
2110 pr->pr_ip4s * sizeof(*pr->pr_ip4));
2111 if (error != 0 && error != ENOENT)
2115 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
2116 pr->pr_ip6s * sizeof(*pr->pr_ip6));
2117 if (error != 0 && error != ENOENT)
2120 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
2121 sizeof(pr->pr_securelevel));
2122 if (error != 0 && error != ENOENT)
2124 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
2125 sizeof(pr->pr_childcount));
2126 if (error != 0 && error != ENOENT)
2128 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
2129 sizeof(pr->pr_childmax));
2130 if (error != 0 && error != ENOENT)
2132 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
2133 if (error != 0 && error != ENOENT)
2135 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
2136 if (error != 0 && error != ENOENT)
2138 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
2139 if (error != 0 && error != ENOENT)
2141 #ifdef COMPAT_FREEBSD32
2142 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
2143 uint32_t hid32 = pr->pr_hostid;
2145 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
2148 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
2149 sizeof(pr->pr_hostid));
2150 if (error != 0 && error != ENOENT)
2152 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
2153 sizeof(pr->pr_enforce_statfs));
2154 if (error != 0 && error != ENOENT)
2156 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
2157 sizeof(pr->pr_devfs_rsnum));
2158 if (error != 0 && error != ENOENT)
2160 for (bf = pr_flag_bool;
2161 bf < pr_flag_bool + nitems(pr_flag_bool);
2163 i = (pr->pr_flags & bf->flag) ? 1 : 0;
2164 error = vfs_setopt(opts, bf->name, &i, sizeof(i));
2165 if (error != 0 && error != ENOENT)
2168 error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
2169 if (error != 0 && error != ENOENT)
2172 for (jsf = pr_flag_jailsys;
2173 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
2175 f = pr->pr_flags & (jsf->disable | jsf->new);
2176 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE
2177 : (f == jsf->new) ? JAIL_SYS_NEW
2179 error = vfs_setopt(opts, jsf->name, &i, sizeof(i));
2180 if (error != 0 && error != ENOENT)
2183 for (bf = pr_flag_allow;
2184 bf < pr_flag_allow + nitems(pr_flag_allow) &&
2185 atomic_load_int(&bf->flag) != 0;
2187 i = (pr->pr_allow & bf->flag) ? 1 : 0;
2188 error = vfs_setopt(opts, bf->name, &i, sizeof(i));
2189 if (error != 0 && error != ENOENT)
2192 error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
2193 if (error != 0 && error != ENOENT)
2196 i = !prison_isalive(pr);
2197 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2198 if (error != 0 && error != ENOENT)
2201 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2202 if (error != 0 && error != ENOENT)
2204 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate,
2205 sizeof(pr->pr_osreldate));
2206 if (error != 0 && error != ENOENT)
2208 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease);
2209 if (error != 0 && error != ENOENT)
2212 /* Get the module parameters. */
2213 mtx_unlock(&pr->pr_mtx);
2214 drflags &= ~PD_LOCKED;
2215 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2218 prison_deref(pr, drflags);
2222 /* By now, all parameters should have been noted. */
2223 TAILQ_FOREACH(opt, opts, link) {
2224 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2226 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2231 /* Write the fetched parameters back to userspace. */
2233 TAILQ_FOREACH(opt, opts, link) {
2234 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2235 pos = 2 * opt->pos + 1;
2236 optuio->uio_iov[pos].iov_len = opt->len;
2237 if (opt->value != NULL) {
2238 if (optuio->uio_segflg == UIO_SYSSPACE) {
2240 optuio->uio_iov[pos].iov_base,
2243 error = copyout(opt->value,
2244 optuio->uio_iov[pos].iov_base,
2254 /* Release any temporary prison holds and/or locks. */
2256 prison_deref(pr, drflags);
2257 else if (drflags & PD_LIST_SLOCKED)
2258 sx_sunlock(&allprison_lock);
2259 if (error && errmsg_pos >= 0) {
2260 /* Write the error message back to userspace. */
2261 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2262 errmsg_pos = 2 * errmsg_pos + 1;
2263 if (errmsg_len > 0) {
2264 if (optuio->uio_segflg == UIO_SYSSPACE)
2266 optuio->uio_iov[errmsg_pos].iov_base,
2270 optuio->uio_iov[errmsg_pos].iov_base,
2279 * struct jail_remove_args {
2284 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
2289 error = priv_check(td, PRIV_JAIL_REMOVE);
2293 sx_xlock(&allprison_lock);
2294 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2296 sx_xunlock(&allprison_lock);
2299 if (!prison_isalive(pr)) {
2300 /* Silently ignore already-dying prisons. */
2301 mtx_unlock(&pr->pr_mtx);
2302 sx_xunlock(&allprison_lock);
2305 prison_deref(pr, PD_KILL | PD_LOCKED | PD_LIST_XLOCKED);
2310 * struct jail_attach_args {
2315 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
2320 error = priv_check(td, PRIV_JAIL_ATTACH);
2324 sx_slock(&allprison_lock);
2325 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2327 sx_sunlock(&allprison_lock);
2331 /* Do not allow a process to attach to a prison that is not alive. */
2332 if (!prison_isalive(pr)) {
2333 mtx_unlock(&pr->pr_mtx);
2334 sx_sunlock(&allprison_lock);
2338 return (do_jail_attach(td, pr, PD_LOCKED | PD_LIST_SLOCKED));
2342 do_jail_attach(struct thread *td, struct prison *pr, int drflags)
2345 struct ucred *newcred, *oldcred;
2348 mtx_assert(&pr->pr_mtx, MA_OWNED);
2349 sx_assert(&allprison_lock, SX_LOCKED);
2350 drflags &= PD_LOCK_FLAGS;
2352 * XXX: Note that there is a slight race here if two threads
2353 * in the same privileged process attempt to attach to two
2354 * different jails at the same time. It is important for
2355 * user processes not to do this, or they might end up with
2356 * a process root from one prison, but attached to the jail
2360 refcount_acquire(&pr->pr_uref);
2361 drflags |= PD_DEREF | PD_DEUREF;
2362 mtx_unlock(&pr->pr_mtx);
2363 drflags &= ~PD_LOCKED;
2365 /* Let modules do whatever they need to prepare for attaching. */
2366 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
2368 prison_deref(pr, drflags);
2371 sx_unlock(&allprison_lock);
2372 drflags &= ~(PD_LIST_SLOCKED | PD_LIST_XLOCKED);
2375 * Reparent the newly attached process to this jail.
2378 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
2382 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
2383 if ((error = change_dir(pr->pr_root, td)) != 0)
2386 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
2389 VOP_UNLOCK(pr->pr_root);
2390 if ((error = pwd_chroot_chdir(td, pr->pr_root)))
2395 oldcred = crcopysafe(p, newcred);
2396 newcred->cr_prison = pr;
2397 proc_set_cred(p, newcred);
2400 racct_proc_ucred_changed(p, oldcred, newcred);
2405 rctl_proc_ucred_changed(p, newcred);
2408 prison_deref(oldcred->cr_prison, drflags);
2412 * If the prison was killed while changing credentials, die along
2415 if (!prison_isalive(pr)) {
2417 kern_psignal(p, SIGKILL);
2424 VOP_UNLOCK(pr->pr_root);
2426 /* Tell modules this thread is still in its old jail after all. */
2427 sx_slock(&allprison_lock);
2428 drflags |= PD_LIST_SLOCKED;
2429 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td);
2430 prison_deref(pr, drflags);
2435 * Returns a locked prison instance, or NULL on failure.
2438 prison_find(int prid)
2442 sx_assert(&allprison_lock, SX_LOCKED);
2443 TAILQ_FOREACH(pr, &allprison, pr_list) {
2444 if (pr->pr_id < prid)
2446 if (pr->pr_id > prid)
2448 KASSERT(prison_isvalid(pr), ("Found invalid prison %p", pr));
2449 mtx_lock(&pr->pr_mtx);
2456 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
2459 prison_find_child(struct prison *mypr, int prid)
2464 sx_assert(&allprison_lock, SX_LOCKED);
2465 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2466 if (pr->pr_id == prid) {
2467 KASSERT(prison_isvalid(pr),
2468 ("Found invalid prison %p", pr));
2469 mtx_lock(&pr->pr_mtx);
2477 * Look for the name relative to mypr. Returns a locked prison or NULL.
2480 prison_find_name(struct prison *mypr, const char *name)
2482 struct prison *pr, *deadpr;
2486 sx_assert(&allprison_lock, SX_LOCKED);
2487 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
2489 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2490 if (!strcmp(pr->pr_name + mylen, name)) {
2491 KASSERT(prison_isvalid(pr),
2492 ("Found invalid prison %p", pr));
2493 if (prison_isalive(pr)) {
2494 mtx_lock(&pr->pr_mtx);
2500 /* There was no valid prison - perhaps there was a dying one. */
2502 mtx_lock(&deadpr->pr_mtx);
2507 * See if a prison has the specific flag set. The prison should be locked,
2508 * unless checking for flags that are only set at jail creation (such as
2509 * PR_IP4 and PR_IP6), or only the single bit is examined, without regard
2510 * to any other prison data.
2513 prison_flag(struct ucred *cred, unsigned flag)
2516 return (cred->cr_prison->pr_flags & flag);
2520 prison_allow(struct ucred *cred, unsigned flag)
2523 return ((cred->cr_prison->pr_allow & flag) != 0);
2527 * Hold a prison reference, by incrementing pr_ref. It is generally
2528 * an error to hold a prison that does not already have a reference.
2529 * A prison record will remain valid as long as it has at least one
2530 * reference, and will not be removed as long as either the prison
2531 * mutex or the allprison lock is held (allprison_lock may be shared).
2534 prison_hold_locked(struct prison *pr)
2537 /* Locking is no longer required. */
2542 prison_hold(struct prison *pr)
2545 int was_valid = refcount_acquire_if_not_zero(&pr->pr_ref);
2548 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id));
2550 refcount_acquire(&pr->pr_ref);
2555 * Remove a prison reference. If that was the last reference, the
2556 * prison will be removed (at a later time).
2559 prison_free_locked(struct prison *pr)
2562 mtx_assert(&pr->pr_mtx, MA_OWNED);
2564 * Locking is no longer required, but unlock because the caller
2567 mtx_unlock(&pr->pr_mtx);
2572 prison_free(struct prison *pr)
2575 KASSERT(refcount_load(&pr->pr_ref) > 0,
2576 ("Trying to free dead prison %p (jid=%d).",
2578 if (!refcount_release_if_not_last(&pr->pr_ref)) {
2580 * Don't remove the last reference in this context,
2581 * in case there are locks held.
2583 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2588 prison_free_not_last(struct prison *pr)
2593 KASSERT(refcount_load(&pr->pr_ref) > 0,
2594 ("Trying to free dead prison %p (jid=%d).",
2596 lastref = refcount_release(&pr->pr_ref);
2598 ("prison_free_not_last freed last ref on prison %p (jid=%d).",
2601 refcount_release(&pr->pr_ref);
2606 * Hold a a prison for user visibility, by incrementing pr_uref.
2607 * It is generally an error to hold a prison that isn't already
2608 * user-visible, except through the the jail system calls. It is also
2609 * an error to hold an invalid prison. A prison record will remain
2610 * alive as long as it has at least one user reference, and will not
2611 * be set to the dying state until the prison mutex and allprison_lock
2615 prison_proc_hold(struct prison *pr)
2618 int was_alive = refcount_acquire_if_not_zero(&pr->pr_uref);
2621 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
2623 refcount_acquire(&pr->pr_uref);
2628 * Remove a prison user reference. If it was the last reference, the
2629 * prison will be considered "dying", and may be removed once all of
2630 * its references are dropped.
2633 prison_proc_free(struct prison *pr)
2637 * Locking is only required when releasing the last reference.
2638 * This allows assurance that a locked prison will remain alive
2639 * until it is unlocked.
2641 KASSERT(refcount_load(&pr->pr_uref) > 0,
2642 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
2643 if (!refcount_release_if_not_last(&pr->pr_uref)) {
2645 * Don't remove the last user reference in this context,
2646 * which is expected to be a process that is not only locked,
2647 * but also half dead. Add a reference so any calls to
2648 * prison_free() won't re-submit the task.
2651 mtx_lock(&pr->pr_mtx);
2652 KASSERT(!(pr->pr_flags & PR_COMPLETE_PROC),
2653 ("Redundant last reference in prison_proc_free (jid=%d)",
2655 pr->pr_flags |= PR_COMPLETE_PROC;
2656 mtx_unlock(&pr->pr_mtx);
2657 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2662 prison_proc_free_not_last(struct prison *pr)
2667 KASSERT(refcount_load(&pr->pr_uref) > 0,
2668 ("Trying to free dead prison %p (jid=%d).",
2670 lastref = refcount_release(&pr->pr_uref);
2672 ("prison_proc_free_not_last freed last uref on prison %p (jid=%d).",
2675 refcount_release(&pr->pr_uref);
2680 * Complete a call to either prison_free or prison_proc_free.
2683 prison_complete(void *context, int pending)
2685 struct prison *pr = context;
2689 * This could be called to release the last reference, or the last
2690 * user reference (plus the reference held in prison_proc_free).
2692 drflags = prison_lock_xlock(pr, PD_DEREF);
2693 if (pr->pr_flags & PR_COMPLETE_PROC) {
2694 pr->pr_flags &= ~PR_COMPLETE_PROC;
2695 drflags |= PD_DEUREF;
2697 prison_deref(pr, drflags);
2701 * Remove a prison reference and/or user reference (usually).
2702 * This assumes context that allows sleeping (for allprison_lock),
2703 * with no non-sleeping locks held, except perhaps the prison itself.
2704 * If there are no more references, release and delist the prison.
2705 * On completion, the prison lock and the allprison lock are both
2709 prison_deref(struct prison *pr, int flags)
2711 struct prisonlist freeprison;
2712 struct prison *killpr, *rpr, *ppr, *tpr;
2716 TAILQ_INIT(&freeprison);
2718 * Release this prison as requested, which may cause its parent
2719 * to be released, and then maybe its grandparent, etc.
2722 if (flags & PD_KILL) {
2723 /* Kill the prison and its descendents. */
2724 KASSERT(pr != &prison0,
2725 ("prison_deref trying to kill prison0"));
2726 if (!(flags & PD_DEREF)) {
2730 flags = prison_lock_xlock(pr, flags);
2731 prison_deref_kill(pr, &freeprison);
2733 if (flags & PD_DEUREF) {
2734 /* Drop a user reference. */
2735 KASSERT(refcount_load(&pr->pr_uref) > 0,
2736 ("prison_deref PD_DEUREF on a dead prison (jid=%d)",
2738 if (!refcount_release_if_not_last(&pr->pr_uref)) {
2739 if (!(flags & PD_DEREF)) {
2743 flags = prison_lock_xlock(pr, flags);
2744 if (refcount_release(&pr->pr_uref) &&
2745 pr->pr_state == PRISON_STATE_ALIVE) {
2747 * When the last user references goes,
2748 * this becomes a dying prison.
2751 refcount_load(&prison0.pr_uref) > 0,
2752 ("prison0 pr_uref=0"));
2753 pr->pr_state = PRISON_STATE_DYING;
2754 mtx_unlock(&pr->pr_mtx);
2755 flags &= ~PD_LOCKED;
2756 (void)osd_jail_call(pr,
2757 PR_METHOD_REMOVE, NULL);
2761 if (flags & PD_KILL) {
2763 * Any remaining user references are probably processes
2764 * that need to be killed, either in this prison or its
2767 if (refcount_load(&pr->pr_uref) > 0)
2769 /* Make sure the parent prison doesn't get killed. */
2772 if (flags & PD_DEREF) {
2773 /* Drop a reference. */
2774 KASSERT(refcount_load(&pr->pr_ref) > 0,
2775 ("prison_deref PD_DEREF on a dead prison (jid=%d)",
2777 if (!refcount_release_if_not_last(&pr->pr_ref)) {
2778 flags = prison_lock_xlock(pr, flags);
2779 if (refcount_release(&pr->pr_ref)) {
2781 * When the last reference goes,
2782 * unlink the prison and set it aside.
2785 refcount_load(&pr->pr_uref) == 0,
2786 ("prison_deref: last ref, "
2787 "but still has %d urefs (jid=%d)",
2788 pr->pr_uref, pr->pr_id));
2790 refcount_load(&prison0.pr_ref) != 0,
2791 ("prison0 pr_ref=0"));
2792 pr->pr_state = PRISON_STATE_INVALID;
2793 TAILQ_REMOVE(&allprison, pr, pr_list);
2794 LIST_REMOVE(pr, pr_sibling);
2795 TAILQ_INSERT_TAIL(&freeprison, pr,
2797 for (ppr = pr->pr_parent;
2799 ppr = ppr->pr_parent)
2800 ppr->pr_childcount--;
2802 * Removing a prison frees references
2805 mtx_unlock(&pr->pr_mtx);
2806 flags &= ~PD_LOCKED;
2808 flags |= PD_DEREF | PD_DEUREF;
2816 /* Release all the prison locks. */
2817 if (flags & PD_LOCKED)
2818 mtx_unlock(&pr->pr_mtx);
2819 if (flags & PD_LIST_SLOCKED)
2820 sx_sunlock(&allprison_lock);
2821 else if (flags & PD_LIST_XLOCKED)
2822 sx_xunlock(&allprison_lock);
2824 /* Kill any processes attached to a killed prison. */
2825 if (killpr != NULL) {
2826 sx_slock(&allproc_lock);
2827 FOREACH_PROC_IN_SYSTEM(p) {
2829 if (p->p_state != PRS_NEW && p->p_ucred != NULL) {
2830 for (ppr = p->p_ucred->cr_prison;
2832 ppr = ppr->pr_parent)
2833 if (ppr == killpr) {
2834 kern_psignal(p, SIGKILL);
2840 sx_sunlock(&allproc_lock);
2844 * Finish removing any unreferenced prisons, which couldn't happen
2845 * while allprison_lock was held (to avoid a LOR on vrele).
2847 TAILQ_FOREACH_SAFE(rpr, &freeprison, pr_list, tpr) {
2849 if (rpr->pr_vnet != rpr->pr_parent->pr_vnet)
2850 vnet_destroy(rpr->pr_vnet);
2852 if (rpr->pr_root != NULL)
2853 vrele(rpr->pr_root);
2854 mtx_destroy(&rpr->pr_mtx);
2856 free(rpr->pr_ip4, M_PRISON);
2859 free(rpr->pr_ip6, M_PRISON);
2861 if (rpr->pr_cpuset != NULL)
2862 cpuset_rel(rpr->pr_cpuset);
2866 prison_racct_detach(rpr);
2868 TAILQ_REMOVE(&freeprison, rpr, pr_list);
2869 free(rpr, M_PRISON);
2874 * Kill the prison and its descendants. Mark them as dying, clear the
2875 * persist flag, and call module remove methods.
2878 prison_deref_kill(struct prison *pr, struct prisonlist *freeprison)
2880 struct prison *cpr, *ppr, *rpr;
2884 * Unlike the descendants, the target prison can be killed
2885 * even if it is currently dying. This is useful for failed
2886 * creation in jail_set(2).
2888 KASSERT(refcount_load(&pr->pr_ref) > 0,
2889 ("Trying to kill dead prison %p (jid=%d).",
2891 refcount_acquire(&pr->pr_uref);
2892 pr->pr_state = PRISON_STATE_DYING;
2893 mtx_unlock(&pr->pr_mtx);
2896 FOREACH_PRISON_DESCENDANT_PRE_POST(pr, cpr, descend) {
2898 if (!prison_isalive(cpr)) {
2903 prison_proc_hold(cpr);
2904 mtx_lock(&cpr->pr_mtx);
2905 cpr->pr_state = PRISON_STATE_DYING;
2906 cpr->pr_flags |= PR_REMOVE;
2907 mtx_unlock(&cpr->pr_mtx);
2910 if (!(cpr->pr_flags & PR_REMOVE))
2912 (void)osd_jail_call(cpr, PR_METHOD_REMOVE, NULL);
2913 mtx_lock(&cpr->pr_mtx);
2914 cpr->pr_flags &= ~PR_REMOVE;
2915 if (cpr->pr_flags & PR_PERSIST) {
2916 cpr->pr_flags &= ~PR_PERSIST;
2917 prison_proc_free_not_last(cpr);
2918 prison_free_not_last(cpr);
2920 (void)refcount_release(&cpr->pr_uref);
2921 if (refcount_release(&cpr->pr_ref)) {
2923 * When the last reference goes, unlink the prison
2924 * and set it aside for prison_deref() to handle.
2925 * Delay unlinking the sibling list to keep the loop
2929 LIST_REMOVE(rpr, pr_sibling);
2931 rpr->pr_state = PRISON_STATE_INVALID;
2932 TAILQ_REMOVE(&allprison, rpr, pr_list);
2933 TAILQ_INSERT_TAIL(freeprison, rpr, pr_list);
2935 * Removing a prison frees references from its parent.
2937 ppr = rpr->pr_parent;
2938 prison_proc_free_not_last(ppr);
2939 prison_free_not_last(ppr);
2940 for (; ppr != NULL; ppr = ppr->pr_parent)
2941 ppr->pr_childcount--;
2943 mtx_unlock(&cpr->pr_mtx);
2946 LIST_REMOVE(rpr, pr_sibling);
2948 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
2949 mtx_lock(&pr->pr_mtx);
2950 if (pr->pr_flags & PR_PERSIST) {
2951 pr->pr_flags &= ~PR_PERSIST;
2952 prison_proc_free_not_last(pr);
2953 prison_free_not_last(pr);
2955 (void)refcount_release(&pr->pr_uref);
2959 * Given the current locking state in the flags, make sure allprison_lock
2960 * is held exclusive, and the prison is locked. Return flags indicating
2964 prison_lock_xlock(struct prison *pr, int flags)
2967 if (!(flags & PD_LIST_XLOCKED)) {
2969 * Get allprison_lock, which may be an upgrade,
2970 * and may require unlocking the prison.
2972 if (flags & PD_LOCKED) {
2973 mtx_unlock(&pr->pr_mtx);
2974 flags &= ~PD_LOCKED;
2976 if (flags & PD_LIST_SLOCKED) {
2977 if (!sx_try_upgrade(&allprison_lock)) {
2978 sx_sunlock(&allprison_lock);
2979 sx_xlock(&allprison_lock);
2981 flags &= ~PD_LIST_SLOCKED;
2983 sx_xlock(&allprison_lock);
2984 flags |= PD_LIST_XLOCKED;
2986 if (!(flags & PD_LOCKED)) {
2987 /* Lock the prison mutex. */
2988 mtx_lock(&pr->pr_mtx);
2995 * Set or clear a permission bit in the pr_allow field, passing restrictions
2996 * (cleared permission) down to child jails.
2999 prison_set_allow(struct ucred *cred, unsigned flag, int enable)
3003 pr = cred->cr_prison;
3004 sx_slock(&allprison_lock);
3005 mtx_lock(&pr->pr_mtx);
3006 prison_set_allow_locked(pr, flag, enable);
3007 mtx_unlock(&pr->pr_mtx);
3008 sx_sunlock(&allprison_lock);
3012 prison_set_allow_locked(struct prison *pr, unsigned flag, int enable)
3018 pr->pr_allow |= flag;
3020 pr->pr_allow &= ~flag;
3021 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
3022 cpr->pr_allow &= ~flag;
3027 * Check if a jail supports the given address family.
3029 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
3033 prison_check_af(struct ucred *cred, int af)
3038 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3040 pr = cred->cr_prison;
3042 /* Prisons with their own network stack are not limited. */
3043 if (prison_owns_vnet(cred))
3052 if (pr->pr_flags & PR_IP4)
3054 mtx_lock(&pr->pr_mtx);
3055 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
3056 error = EAFNOSUPPORT;
3057 mtx_unlock(&pr->pr_mtx);
3063 if (pr->pr_flags & PR_IP6)
3065 mtx_lock(&pr->pr_mtx);
3066 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
3067 error = EAFNOSUPPORT;
3068 mtx_unlock(&pr->pr_mtx);
3076 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
3077 error = EAFNOSUPPORT;
3083 * Check if given address belongs to the jail referenced by cred (wrapper to
3084 * prison_check_ip[46]).
3086 * Returns 0 if jail doesn't restrict the address family or if address belongs
3087 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
3088 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
3091 prison_if(struct ucred *cred, const struct sockaddr *sa)
3094 const struct sockaddr_in *sai;
3097 const struct sockaddr_in6 *sai6;
3101 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3102 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
3105 if (prison_owns_vnet(cred))
3110 switch (sa->sa_family)
3114 sai = (const struct sockaddr_in *)sa;
3115 error = prison_check_ip4(cred, &sai->sin_addr);
3120 sai6 = (const struct sockaddr_in6 *)sa;
3121 error = prison_check_ip6(cred, &sai6->sin6_addr);
3125 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
3126 error = EAFNOSUPPORT;
3132 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
3135 prison_check(struct ucred *cred1, struct ucred *cred2)
3138 return ((cred1->cr_prison == cred2->cr_prison ||
3139 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
3143 * Return 1 if p2 is a child of p1, otherwise 0.
3146 prison_ischild(struct prison *pr1, struct prison *pr2)
3149 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
3156 * Return true if the prison is currently alive. A prison is alive if it
3157 * holds user references and it isn't being removed.
3160 prison_isalive(struct prison *pr)
3163 if (__predict_false(pr->pr_state != PRISON_STATE_ALIVE))
3169 * Return true if the prison is currently valid. A prison is valid if it has
3170 * been fully created, and is not being destroyed. Note that dying prisons
3171 * are still considered valid. Invalid prisons won't be found under normal
3172 * circumstances, as they're only put in that state by functions that have
3173 * an exclusive hold on allprison_lock.
3176 prison_isvalid(struct prison *pr)
3179 if (__predict_false(pr->pr_state == PRISON_STATE_INVALID))
3181 if (__predict_false(refcount_load(&pr->pr_ref) == 0))
3187 * Return 1 if the passed credential is in a jail and that jail does not
3188 * have its own virtual network stack, otherwise 0.
3191 jailed_without_vnet(struct ucred *cred)
3197 if (prison_owns_vnet(cred))
3205 * Return the correct hostname (domainname, et al) for the passed credential.
3208 getcredhostname(struct ucred *cred, char *buf, size_t size)
3213 * A NULL credential can be used to shortcut to the physical
3214 * system's hostname.
3216 pr = (cred != NULL) ? cred->cr_prison : &prison0;
3217 mtx_lock(&pr->pr_mtx);
3218 strlcpy(buf, pr->pr_hostname, size);
3219 mtx_unlock(&pr->pr_mtx);
3223 getcreddomainname(struct ucred *cred, char *buf, size_t size)
3226 mtx_lock(&cred->cr_prison->pr_mtx);
3227 strlcpy(buf, cred->cr_prison->pr_domainname, size);
3228 mtx_unlock(&cred->cr_prison->pr_mtx);
3232 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
3235 mtx_lock(&cred->cr_prison->pr_mtx);
3236 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
3237 mtx_unlock(&cred->cr_prison->pr_mtx);
3241 getcredhostid(struct ucred *cred, unsigned long *hostid)
3244 mtx_lock(&cred->cr_prison->pr_mtx);
3245 *hostid = cred->cr_prison->pr_hostid;
3246 mtx_unlock(&cred->cr_prison->pr_mtx);
3250 getjailname(struct ucred *cred, char *name, size_t len)
3253 mtx_lock(&cred->cr_prison->pr_mtx);
3254 strlcpy(name, cred->cr_prison->pr_name, len);
3255 mtx_unlock(&cred->cr_prison->pr_mtx);
3260 * Determine whether the prison represented by cred owns
3261 * its vnet rather than having it inherited.
3263 * Returns 1 in case the prison owns the vnet, 0 otherwise.
3266 prison_owns_vnet(struct ucred *cred)
3270 * vnets cannot be added/removed after jail creation,
3271 * so no need to lock here.
3273 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
3278 * Determine whether the subject represented by cred can "see"
3279 * status of a mount point.
3280 * Returns: 0 for permitted, ENOENT otherwise.
3281 * XXX: This function should be called cr_canseemount() and should be
3282 * placed in kern_prot.c.
3285 prison_canseemount(struct ucred *cred, struct mount *mp)
3291 pr = cred->cr_prison;
3292 if (pr->pr_enforce_statfs == 0)
3294 if (pr->pr_root->v_mount == mp)
3296 if (pr->pr_enforce_statfs == 2)
3299 * If jail's chroot directory is set to "/" we should be able to see
3300 * all mount-points from inside a jail.
3301 * This is ugly check, but this is the only situation when jail's
3302 * directory ends with '/'.
3304 if (strcmp(pr->pr_path, "/") == 0)
3306 len = strlen(pr->pr_path);
3308 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
3311 * Be sure that we don't have situation where jail's root directory
3312 * is "/some/path" and mount point is "/some/pathpath".
3314 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
3320 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
3322 char jpath[MAXPATHLEN];
3326 pr = cred->cr_prison;
3327 if (pr->pr_enforce_statfs == 0)
3329 if (prison_canseemount(cred, mp) != 0) {
3330 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3331 strlcpy(sp->f_mntonname, "[restricted]",
3332 sizeof(sp->f_mntonname));
3335 if (pr->pr_root->v_mount == mp) {
3337 * Clear current buffer data, so we are sure nothing from
3338 * the valid path left there.
3340 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3341 *sp->f_mntonname = '/';
3345 * If jail's chroot directory is set to "/" we should be able to see
3346 * all mount-points from inside a jail.
3348 if (strcmp(pr->pr_path, "/") == 0)
3350 len = strlen(pr->pr_path);
3351 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
3353 * Clear current buffer data, so we are sure nothing from
3354 * the valid path left there.
3356 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3357 if (*jpath == '\0') {
3358 /* Should never happen. */
3359 *sp->f_mntonname = '/';
3361 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
3366 * Check with permission for a specific privilege is granted within jail. We
3367 * have a specific list of accepted privileges; the rest are denied.
3370 prison_priv_check(struct ucred *cred, int priv)
3376 * Some policies have custom handlers. This routine should not be
3377 * called for them. See priv_check_cred().
3380 case PRIV_VFS_LOOKUP:
3381 case PRIV_VFS_GENERATION:
3382 KASSERT(0, ("prison_priv_check instead of a custom handler "
3383 "called for %d\n", priv));
3391 * Privileges specific to prisons with a virtual network stack.
3392 * There might be a duplicate entry here in case the privilege
3393 * is only granted conditionally in the legacy jail case.
3398 * NFS-specific privileges.
3400 case PRIV_NFS_DAEMON:
3401 case PRIV_NFS_LOCKD:
3404 * Network stack privileges.
3406 case PRIV_NET_BRIDGE:
3409 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
3410 case PRIV_NET_ROUTE:
3412 case PRIV_NET_SETIFMTU:
3413 case PRIV_NET_SETIFFLAGS:
3414 case PRIV_NET_SETIFCAP:
3415 case PRIV_NET_SETIFDESCR:
3416 case PRIV_NET_SETIFNAME :
3417 case PRIV_NET_SETIFMETRIC:
3418 case PRIV_NET_SETIFPHYS:
3419 case PRIV_NET_SETIFMAC:
3420 case PRIV_NET_SETLANPCP:
3421 case PRIV_NET_ADDMULTI:
3422 case PRIV_NET_DELMULTI:
3423 case PRIV_NET_HWIOCTL:
3424 case PRIV_NET_SETLLADDR:
3425 case PRIV_NET_ADDIFGROUP:
3426 case PRIV_NET_DELIFGROUP:
3427 case PRIV_NET_IFCREATE:
3428 case PRIV_NET_IFDESTROY:
3429 case PRIV_NET_ADDIFADDR:
3430 case PRIV_NET_DELIFADDR:
3433 case PRIV_NET_SETIFVNET:
3434 case PRIV_NET_SETIFFIB:
3437 * 802.11-related privileges.
3439 case PRIV_NET80211_VAP_GETKEY:
3440 case PRIV_NET80211_VAP_MANAGE:
3446 case PRIV_NETATM_CFG:
3447 case PRIV_NETATM_ADD:
3448 case PRIV_NETATM_DEL:
3449 case PRIV_NETATM_SET:
3452 * Bluetooth privileges.
3454 case PRIV_NETBLUETOOTH_RAW:
3458 * Netgraph and netgraph module privileges.
3460 case PRIV_NETGRAPH_CONTROL:
3462 case PRIV_NETGRAPH_TTY:
3466 * IPv4 and IPv6 privileges.
3468 case PRIV_NETINET_IPFW:
3469 case PRIV_NETINET_DIVERT:
3470 case PRIV_NETINET_PF:
3471 case PRIV_NETINET_DUMMYNET:
3472 case PRIV_NETINET_CARP:
3473 case PRIV_NETINET_MROUTE:
3474 case PRIV_NETINET_RAW:
3475 case PRIV_NETINET_ADDRCTRL6:
3476 case PRIV_NETINET_ND6:
3477 case PRIV_NETINET_SCOPE6:
3478 case PRIV_NETINET_ALIFETIME6:
3479 case PRIV_NETINET_IPSEC:
3480 case PRIV_NETINET_BINDANY:
3495 * No default: or deny here.
3496 * In case of no permit fall through to next switch().
3498 if (cred->cr_prison->pr_flags & PR_VNET)
3505 * Allow ktrace privileges for root in jail.
3511 * Allow jailed processes to configure audit identity and
3512 * submit audit records (login, etc). In the future we may
3513 * want to further refine the relationship between audit and
3516 case PRIV_AUDIT_GETAUDIT:
3517 case PRIV_AUDIT_SETAUDIT:
3518 case PRIV_AUDIT_SUBMIT:
3522 * Allow jailed processes to manipulate process UNIX
3523 * credentials in any way they see fit.
3525 case PRIV_CRED_SETUID:
3526 case PRIV_CRED_SETEUID:
3527 case PRIV_CRED_SETGID:
3528 case PRIV_CRED_SETEGID:
3529 case PRIV_CRED_SETGROUPS:
3530 case PRIV_CRED_SETREUID:
3531 case PRIV_CRED_SETREGID:
3532 case PRIV_CRED_SETRESUID:
3533 case PRIV_CRED_SETRESGID:
3536 * Jail implements visibility constraints already, so allow
3537 * jailed root to override uid/gid-based constraints.
3539 case PRIV_SEEOTHERGIDS:
3540 case PRIV_SEEOTHERUIDS:
3543 * Jail implements inter-process debugging limits already, so
3544 * allow jailed root various debugging privileges.
3546 case PRIV_DEBUG_DIFFCRED:
3547 case PRIV_DEBUG_SUGID:
3548 case PRIV_DEBUG_UNPRIV:
3551 * Allow jail to set various resource limits and login
3552 * properties, and for now, exceed process resource limits.
3554 case PRIV_PROC_LIMIT:
3555 case PRIV_PROC_SETLOGIN:
3556 case PRIV_PROC_SETRLIMIT:
3559 * System V and POSIX IPC privileges are granted in jail.
3562 case PRIV_IPC_WRITE:
3563 case PRIV_IPC_ADMIN:
3564 case PRIV_IPC_MSGSIZE:
3568 * Jail operations within a jail work on child jails.
3570 case PRIV_JAIL_ATTACH:
3572 case PRIV_JAIL_REMOVE:
3575 * Jail implements its own inter-process limits, so allow
3576 * root processes in jail to change scheduling on other
3577 * processes in the same jail. Likewise for signalling.
3579 case PRIV_SCHED_DIFFCRED:
3580 case PRIV_SCHED_CPUSET:
3581 case PRIV_SIGNAL_DIFFCRED:
3582 case PRIV_SIGNAL_SUGID:
3585 * Allow jailed processes to write to sysctls marked as jail
3588 case PRIV_SYSCTL_WRITEJAIL:
3591 * Allow root in jail to manage a variety of quota
3592 * properties. These should likely be conditional on a
3593 * configuration option.
3595 case PRIV_VFS_GETQUOTA:
3596 case PRIV_VFS_SETQUOTA:
3599 * Since Jail relies on chroot() to implement file system
3600 * protections, grant many VFS privileges to root in jail.
3601 * Be careful to exclude mount-related and NFS-related
3605 case PRIV_VFS_WRITE:
3606 case PRIV_VFS_ADMIN:
3608 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
3609 case PRIV_VFS_CHFLAGS_DEV:
3610 case PRIV_VFS_CHOWN:
3611 case PRIV_VFS_CHROOT:
3612 case PRIV_VFS_RETAINSUGID:
3613 case PRIV_VFS_FCHROOT:
3615 case PRIV_VFS_SETGID:
3617 case PRIV_VFS_STICKYFILE:
3620 * As in the non-jail case, non-root users are expected to be
3621 * able to read kernel/physical memory (provided /dev/[k]mem
3622 * exists in the jail and they have permission to access it).
3624 case PRIV_KMEM_READ:
3628 * Depending on the global setting, allow privilege of
3629 * setting system flags.
3631 case PRIV_VFS_SYSFLAGS:
3632 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
3638 * Depending on the global setting, allow privilege of
3639 * mounting/unmounting file systems.
3641 case PRIV_VFS_MOUNT:
3642 case PRIV_VFS_UNMOUNT:
3643 case PRIV_VFS_MOUNT_NONUSER:
3644 case PRIV_VFS_MOUNT_OWNER:
3645 pr = cred->cr_prison;
3647 if (pr->pr_allow & PR_ALLOW_MOUNT && pr->pr_enforce_statfs < 2)
3655 * Jails should hold no disposition on the PRIV_VFS_READ_DIR
3656 * policy. priv_check_cred will not specifically allow it, and
3657 * we may want a MAC policy to allow it.
3659 case PRIV_VFS_READ_DIR:
3663 * Conditionnaly allow locking (unlocking) physical pages
3667 case PRIV_VM_MUNLOCK:
3668 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK)
3674 * Conditionally allow jailed root to bind reserved ports.
3676 case PRIV_NETINET_RESERVEDPORT:
3677 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS)
3683 * Allow jailed root to reuse in-use ports.
3685 case PRIV_NETINET_REUSEPORT:
3689 * Allow jailed root to set certain IPv4/6 (option) headers.
3691 case PRIV_NETINET_SETHDROPTS:
3695 * Conditionally allow creating raw sockets in jail.
3697 case PRIV_NETINET_RAW:
3698 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
3704 * Since jail implements its own visibility limits on netstat
3705 * sysctls, allow getcred. This allows identd to work in
3708 case PRIV_NETINET_GETCRED:
3712 * Allow jailed root to set loginclass.
3714 case PRIV_PROC_SETLOGINCLASS:
3718 * Do not allow a process inside a jail to read the kernel
3719 * message buffer unless explicitly permitted.
3722 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF)
3728 * In all remaining cases, deny the privilege request. This
3729 * includes almost all network privileges, many system
3730 * configuration privileges.
3737 * Return the part of pr2's name that is relative to pr1, or the whole name
3738 * if it does not directly follow.
3742 prison_name(struct prison *pr1, struct prison *pr2)
3746 /* Jails see themselves as "0" (if they see themselves at all). */
3749 name = pr2->pr_name;
3750 if (prison_ischild(pr1, pr2)) {
3752 * pr1 isn't locked (and allprison_lock may not be either)
3753 * so its length can't be counted on. But the number of dots
3754 * can be counted on - and counted.
3756 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
3757 name = strchr(name, '.') + 1;
3763 * Return the part of pr2's path that is relative to pr1, or the whole path
3764 * if it does not directly follow.
3767 prison_path(struct prison *pr1, struct prison *pr2)
3769 char *path1, *path2;
3772 path1 = pr1->pr_path;
3773 path2 = pr2->pr_path;
3774 if (!strcmp(path1, "/"))
3776 len1 = strlen(path1);
3777 if (strncmp(path1, path2, len1))
3779 if (path2[len1] == '\0')
3781 if (path2[len1] == '/')
3782 return (path2 + len1);
3787 * Jail-related sysctls.
3789 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
3793 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
3796 struct prison *pr, *cpr;
3798 struct in_addr *ip4 = NULL;
3802 struct in6_addr *ip6 = NULL;
3807 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
3808 pr = req->td->td_ucred->cr_prison;
3810 sx_slock(&allprison_lock);
3811 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
3812 #if defined(INET) || defined(INET6)
3815 mtx_lock(&cpr->pr_mtx);
3817 if (cpr->pr_ip4s > 0) {
3818 if (ip4s < cpr->pr_ip4s) {
3819 ip4s = cpr->pr_ip4s;
3820 mtx_unlock(&cpr->pr_mtx);
3821 ip4 = realloc(ip4, ip4s *
3822 sizeof(struct in_addr), M_TEMP, M_WAITOK);
3825 bcopy(cpr->pr_ip4, ip4,
3826 cpr->pr_ip4s * sizeof(struct in_addr));
3830 if (cpr->pr_ip6s > 0) {
3831 if (ip6s < cpr->pr_ip6s) {
3832 ip6s = cpr->pr_ip6s;
3833 mtx_unlock(&cpr->pr_mtx);
3834 ip6 = realloc(ip6, ip6s *
3835 sizeof(struct in6_addr), M_TEMP, M_WAITOK);
3838 bcopy(cpr->pr_ip6, ip6,
3839 cpr->pr_ip6s * sizeof(struct in6_addr));
3842 bzero(xp, sizeof(*xp));
3843 xp->pr_version = XPRISON_VERSION;
3844 xp->pr_id = cpr->pr_id;
3845 xp->pr_state = cpr->pr_state;
3846 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
3847 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
3848 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
3850 xp->pr_ip4s = cpr->pr_ip4s;
3853 xp->pr_ip6s = cpr->pr_ip6s;
3855 mtx_unlock(&cpr->pr_mtx);
3856 error = SYSCTL_OUT(req, xp, sizeof(*xp));
3860 if (xp->pr_ip4s > 0) {
3861 error = SYSCTL_OUT(req, ip4,
3862 xp->pr_ip4s * sizeof(struct in_addr));
3868 if (xp->pr_ip6s > 0) {
3869 error = SYSCTL_OUT(req, ip6,
3870 xp->pr_ip6s * sizeof(struct in6_addr));
3876 sx_sunlock(&allprison_lock);
3887 SYSCTL_OID(_security_jail, OID_AUTO, list,
3888 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
3889 sysctl_jail_list, "S", "List of active jails");
3892 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
3896 injail = jailed(req->td->td_ucred);
3897 error = SYSCTL_OUT(req, &injail, sizeof(injail));
3902 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
3903 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
3904 sysctl_jail_jailed, "I", "Process in jail?");
3907 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
3909 int error, havevnet;
3911 struct ucred *cred = req->td->td_ucred;
3913 havevnet = jailed(cred) && prison_owns_vnet(cred);
3917 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
3922 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
3923 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
3924 sysctl_jail_vnet, "I", "Jail owns vnet?");
3926 #if defined(INET) || defined(INET6)
3927 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
3928 &jail_max_af_ips, 0,
3929 "Number of IP addresses a jail may have at most per address family (deprecated)");
3933 * Default parameters for jail(2) compatibility. For historical reasons,
3934 * the sysctl names have varying similarity to the parameter names. Prisons
3935 * just see their own parameters, and can't change them.
3938 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
3942 /* Get the current flag value, and convert it to a boolean. */
3943 if (req->td->td_ucred->cr_prison == &prison0) {
3944 mtx_lock(&prison0.pr_mtx);
3945 i = (jail_default_allow & arg2) != 0;
3946 mtx_unlock(&prison0.pr_mtx);
3948 i = prison_allow(req->td->td_ucred, arg2);
3952 error = sysctl_handle_int(oidp, &i, 0, req);
3953 if (error || !req->newptr)
3959 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
3962 mtx_lock(&prison0.pr_mtx);
3963 jail_default_allow = (jail_default_allow & ~arg2) | i;
3964 mtx_unlock(&prison0.pr_mtx);
3968 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
3969 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3970 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
3971 "Processes in jail can set their hostnames (deprecated)");
3972 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
3973 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3974 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
3975 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)");
3976 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
3977 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3978 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
3979 "Processes in jail can use System V IPC primitives (deprecated)");
3980 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
3981 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3982 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
3983 "Prison root can create raw sockets (deprecated)");
3984 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
3985 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3986 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
3987 "Processes in jail can alter system file flags (deprecated)");
3988 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
3989 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3990 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
3991 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)");
3994 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
3999 pr = req->td->td_ucred->cr_prison;
4000 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
4001 error = sysctl_handle_int(oidp, &level, 0, req);
4002 if (error || !req->newptr)
4004 *(int *)arg1 = level;
4008 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
4009 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4010 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
4011 sysctl_jail_default_level, "I",
4012 "Processes in jail cannot see all mounted file systems (deprecated)");
4014 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
4015 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
4016 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
4017 sysctl_jail_default_level, "I",
4018 "Ruleset for the devfs filesystem in jail (deprecated)");
4021 * Nodes to describe jail parameters. Maximum length of string parameters
4022 * is returned in the string itself, and the other parameters exist merely
4023 * to make themselves and their types known.
4025 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
4029 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
4036 switch (oidp->oid_kind & CTLTYPE)
4042 if (!(req->flags & SCTL_MASK32))
4044 return (SYSCTL_OUT(req, &l, sizeof(l)));
4048 return (SYSCTL_OUT(req, &i, sizeof(i)));
4049 case CTLTYPE_STRING:
4050 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
4052 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
4053 case CTLTYPE_STRUCT:
4055 return (SYSCTL_OUT(req, &s, sizeof(s)));
4061 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at
4062 * jail creation time but cannot be changed in an existing jail.
4064 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
4065 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
4066 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
4067 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
4068 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
4069 "I", "Jail secure level");
4070 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I",
4071 "Jail value for kern.osreldate and uname -K");
4072 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN,
4073 "Jail value for kern.osrelease and uname -r");
4074 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
4075 "I", "Jail cannot see all mounted file systems");
4076 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
4077 "I", "Ruleset for in-jail devfs mounts");
4078 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
4079 "B", "Jail persistence");
4081 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
4082 "E,jailsys", "Virtual network stack");
4084 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
4085 "B", "Jail is in the process of shutting down");
4087 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
4088 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
4089 "I", "Current number of child jails");
4090 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
4091 "I", "Maximum number of child jails");
4093 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
4094 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
4096 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
4097 "Jail NIS domainname");
4098 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
4100 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
4101 "LU", "Jail host ID");
4103 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
4104 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
4107 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
4108 "Jail IPv4 address virtualization");
4109 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
4110 "S,in_addr,a", "Jail IPv4 addresses");
4111 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4112 "B", "Do (not) use IPv4 source address selection rather than the "
4113 "primary jail IPv4 address.");
4116 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
4117 "Jail IPv6 address virtualization");
4118 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
4119 "S,in6_addr,a", "Jail IPv6 addresses");
4120 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4121 "B", "Do (not) use IPv6 source address selection rather than the "
4122 "primary jail IPv6 address.");
4125 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
4126 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
4127 "B", "Jail may set hostname");
4128 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
4129 "B", "Jail may use SYSV IPC");
4130 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
4131 "B", "Jail may create raw sockets");
4132 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
4133 "B", "Jail may alter system file flags");
4134 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
4135 "B", "Jail may set file quotas");
4136 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
4137 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
4138 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW,
4139 "B", "Jail may lock (unlock) physical pages in memory");
4140 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW,
4141 "B", "Jail may bind sockets to reserved ports");
4142 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW,
4143 "B", "Jail may read the kernel message buffer");
4144 SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW,
4145 "B", "Unprivileged processes may use process debugging facilities");
4146 SYSCTL_JAIL_PARAM(_allow, suser, CTLTYPE_INT | CTLFLAG_RW,
4147 "B", "Processes in jail with uid 0 have privilege");
4149 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
4150 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
4151 "B", "Jail may mount/unmount jail-friendly file systems in general");
4154 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return
4155 * its associated bit in the pr_allow bitmask, or zero if the parameter was
4159 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr,
4162 struct bool_flags *bf;
4163 struct sysctl_oid *parent;
4164 char *allow_name, *allow_noname, *allowed;
4165 #ifndef NO_SYSCTL_DESCR
4166 char *descr_deprecated;
4171 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name)
4173 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name)
4175 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 ||
4176 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) {
4177 free(allow_name, M_PRISON);
4182 * See if this parameter has already beed added, i.e. a module was
4183 * previously loaded/unloaded.
4185 mtx_lock(&prison0.pr_mtx);
4186 for (bf = pr_flag_allow;
4187 bf < pr_flag_allow + nitems(pr_flag_allow) &&
4188 atomic_load_int(&bf->flag) != 0;
4190 if (strcmp(bf->name, allow_name) == 0) {
4191 allow_flag = bf->flag;
4197 * Find a free bit in pr_allow_all, failing if there are none
4198 * (which shouldn't happen as long as we keep track of how many
4199 * potential dynamic flags exist).
4201 for (allow_flag = 1;; allow_flag <<= 1) {
4202 if (allow_flag == 0)
4204 if ((pr_allow_all & allow_flag) == 0)
4208 /* Note the parameter in the next open slot in pr_flag_allow. */
4209 for (bf = pr_flag_allow; ; bf++) {
4210 if (bf == pr_flag_allow + nitems(pr_flag_allow)) {
4211 /* This should never happen, but is not fatal. */
4215 if (atomic_load_int(&bf->flag) == 0)
4218 bf->name = allow_name;
4219 bf->noname = allow_noname;
4220 pr_allow_all |= allow_flag;
4222 * prison0 always has permission for the new parameter.
4223 * Other jails must have it granted to them.
4225 prison0.pr_allow |= allow_flag;
4226 /* The flag indicates a valid entry, so make sure it is set last. */
4227 atomic_store_rel_int(&bf->flag, allow_flag);
4228 mtx_unlock(&prison0.pr_mtx);
4231 * Create sysctls for the paramter, and the back-compat global
4235 ? SYSCTL_ADD_NODE(NULL,
4236 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow),
4237 OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr)
4238 : &sysctl___security_jail_param_allow;
4239 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO,
4240 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4241 NULL, 0, sysctl_jail_param, "B", descr);
4243 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name)
4244 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) {
4245 #ifndef NO_SYSCTL_DESCR
4246 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)",
4249 (void)SYSCTL_ADD_PROC(NULL,
4250 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed,
4251 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag,
4252 sysctl_jail_default_allow, "I", descr_deprecated);
4253 #ifndef NO_SYSCTL_DESCR
4254 free(descr_deprecated, M_TEMP);
4256 free(allowed, M_TEMP);
4261 mtx_unlock(&prison0.pr_mtx);
4262 free(allow_name, M_PRISON);
4263 free(allow_noname, M_PRISON);
4268 * The VFS system will register jail-aware filesystems here. They each get
4269 * a parameter allow.mount.xxxfs and a flag to check when a jailed user
4270 * attempts to mount.
4273 prison_add_vfs(struct vfsconf *vfsp)
4275 #ifdef NO_SYSCTL_DESCR
4277 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
4282 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system",
4284 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
4286 free(descr, M_TEMP);
4292 prison_racct_foreach(void (*callback)(struct racct *racct,
4293 void *arg2, void *arg3), void (*pre)(void), void (*post)(void),
4294 void *arg2, void *arg3)
4296 struct prison_racct *prr;
4298 ASSERT_RACCT_ENABLED();
4300 sx_slock(&allprison_lock);
4303 LIST_FOREACH(prr, &allprison_racct, prr_next)
4304 (callback)(prr->prr_racct, arg2, arg3);
4307 sx_sunlock(&allprison_lock);
4310 static struct prison_racct *
4311 prison_racct_find_locked(const char *name)
4313 struct prison_racct *prr;
4315 ASSERT_RACCT_ENABLED();
4316 sx_assert(&allprison_lock, SA_XLOCKED);
4318 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
4321 LIST_FOREACH(prr, &allprison_racct, prr_next) {
4322 if (strcmp(name, prr->prr_name) != 0)
4325 /* Found prison_racct with a matching name? */
4326 prison_racct_hold(prr);
4330 /* Add new prison_racct. */
4331 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
4332 racct_create(&prr->prr_racct);
4334 strcpy(prr->prr_name, name);
4335 refcount_init(&prr->prr_refcount, 1);
4336 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
4341 struct prison_racct *
4342 prison_racct_find(const char *name)
4344 struct prison_racct *prr;
4346 ASSERT_RACCT_ENABLED();
4348 sx_xlock(&allprison_lock);
4349 prr = prison_racct_find_locked(name);
4350 sx_xunlock(&allprison_lock);
4355 prison_racct_hold(struct prison_racct *prr)
4358 ASSERT_RACCT_ENABLED();
4360 refcount_acquire(&prr->prr_refcount);
4364 prison_racct_free_locked(struct prison_racct *prr)
4367 ASSERT_RACCT_ENABLED();
4368 sx_assert(&allprison_lock, SA_XLOCKED);
4370 if (refcount_release(&prr->prr_refcount)) {
4371 racct_destroy(&prr->prr_racct);
4372 LIST_REMOVE(prr, prr_next);
4373 free(prr, M_PRISON_RACCT);
4378 prison_racct_free(struct prison_racct *prr)
4381 ASSERT_RACCT_ENABLED();
4382 sx_assert(&allprison_lock, SA_UNLOCKED);
4384 if (refcount_release_if_not_last(&prr->prr_refcount))
4387 sx_xlock(&allprison_lock);
4388 prison_racct_free_locked(prr);
4389 sx_xunlock(&allprison_lock);
4393 prison_racct_attach(struct prison *pr)
4395 struct prison_racct *prr;
4397 ASSERT_RACCT_ENABLED();
4398 sx_assert(&allprison_lock, SA_XLOCKED);
4400 prr = prison_racct_find_locked(pr->pr_name);
4401 KASSERT(prr != NULL, ("cannot find prison_racct"));
4403 pr->pr_prison_racct = prr;
4407 * Handle jail renaming. From the racct point of view, renaming means
4408 * moving from one prison_racct to another.
4411 prison_racct_modify(struct prison *pr)
4417 struct prison_racct *oldprr;
4419 ASSERT_RACCT_ENABLED();
4421 sx_slock(&allproc_lock);
4422 sx_xlock(&allprison_lock);
4424 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
4425 sx_xunlock(&allprison_lock);
4426 sx_sunlock(&allproc_lock);
4430 oldprr = pr->pr_prison_racct;
4431 pr->pr_prison_racct = NULL;
4433 prison_racct_attach(pr);
4436 * Move resource utilisation records.
4438 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
4442 * Force rctl to reattach rules to processes.
4444 FOREACH_PROC_IN_SYSTEM(p) {
4446 cred = crhold(p->p_ucred);
4448 rctl_proc_ucred_changed(p, cred);
4453 sx_sunlock(&allproc_lock);
4454 prison_racct_free_locked(oldprr);
4455 sx_xunlock(&allprison_lock);
4459 prison_racct_detach(struct prison *pr)
4462 ASSERT_RACCT_ENABLED();
4463 sx_assert(&allprison_lock, SA_UNLOCKED);
4465 if (pr->pr_prison_racct == NULL)
4467 prison_racct_free(pr->pr_prison_racct);
4468 pr->pr_prison_racct = NULL;
4475 db_show_prison(struct prison *pr)
4477 struct bool_flags *bf;
4478 struct jailsys_flags *jsf;
4479 #if defined(INET) || defined(INET6)
4484 char ip4buf[INET_ADDRSTRLEN];
4487 char ip6buf[INET6_ADDRSTRLEN];
4490 db_printf("prison %p:\n", pr);
4491 db_printf(" jid = %d\n", pr->pr_id);
4492 db_printf(" name = %s\n", pr->pr_name);
4493 db_printf(" parent = %p\n", pr->pr_parent);
4494 db_printf(" ref = %d\n", pr->pr_ref);
4495 db_printf(" uref = %d\n", pr->pr_uref);
4496 db_printf(" state = %s\n",
4497 pr->pr_state == PRISON_STATE_ALIVE ? "alive" :
4498 pr->pr_state == PRISON_STATE_DYING ? "dying" :
4500 db_printf(" path = %s\n", pr->pr_path);
4501 db_printf(" cpuset = %d\n", pr->pr_cpuset
4502 ? pr->pr_cpuset->cs_id : -1);
4504 db_printf(" vnet = %p\n", pr->pr_vnet);
4506 db_printf(" root = %p\n", pr->pr_root);
4507 db_printf(" securelevel = %d\n", pr->pr_securelevel);
4508 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
4509 db_printf(" children.max = %d\n", pr->pr_childmax);
4510 db_printf(" children.cur = %d\n", pr->pr_childcount);
4511 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
4512 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
4513 db_printf(" flags = 0x%x", pr->pr_flags);
4514 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++)
4515 if (pr->pr_flags & bf->flag)
4516 db_printf(" %s", bf->name);
4517 for (jsf = pr_flag_jailsys;
4518 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
4520 f = pr->pr_flags & (jsf->disable | jsf->new);
4521 db_printf(" %-16s= %s\n", jsf->name,
4522 (f != 0 && f == jsf->disable) ? "disable"
4523 : (f == jsf->new) ? "new"
4526 db_printf(" allow = 0x%x", pr->pr_allow);
4527 for (bf = pr_flag_allow;
4528 bf < pr_flag_allow + nitems(pr_flag_allow) &&
4529 atomic_load_int(&bf->flag) != 0;
4531 if (pr->pr_allow & bf->flag)
4532 db_printf(" %s", bf->name);
4534 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
4535 db_printf(" host.hostname = %s\n", pr->pr_hostname);
4536 db_printf(" host.domainname = %s\n", pr->pr_domainname);
4537 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
4538 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
4540 db_printf(" ip4s = %d\n", pr->pr_ip4s);
4541 for (ii = 0; ii < pr->pr_ip4s; ii++)
4542 db_printf(" %s %s\n",
4543 ii == 0 ? "ip4.addr =" : " ",
4544 inet_ntoa_r(pr->pr_ip4[ii], ip4buf));
4547 db_printf(" ip6s = %d\n", pr->pr_ip6s);
4548 for (ii = 0; ii < pr->pr_ip6s; ii++)
4549 db_printf(" %s %s\n",
4550 ii == 0 ? "ip6.addr =" : " ",
4551 ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
4555 DB_SHOW_COMMAND(prison, db_show_prison_command)
4561 * Show all prisons in the list, and prison0 which is not
4564 db_show_prison(&prison0);
4565 if (!db_pager_quit) {
4566 TAILQ_FOREACH(pr, &allprison, pr_list) {
4578 /* Look for a prison with the ID and with references. */
4579 TAILQ_FOREACH(pr, &allprison, pr_list)
4580 if (pr->pr_id == addr && pr->pr_ref > 0)
4583 /* Look again, without requiring a reference. */
4584 TAILQ_FOREACH(pr, &allprison, pr_list)
4585 if (pr->pr_id == addr)
4588 /* Assume address points to a valid prison. */
4589 pr = (struct prison *)addr;