2 * Copyright (c) 1999 Poul-Henning Kamp.
3 * Copyright (c) 2008 Bjoern A. Zeeb.
4 * Copyright (c) 2009 James Gritton.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include "opt_compat.h"
35 #include "opt_inet6.h"
37 #include <sys/param.h>
38 #include <sys/types.h>
39 #include <sys/kernel.h>
40 #include <sys/systm.h>
41 #include <sys/errno.h>
42 #include <sys/sysproto.h>
43 #include <sys/malloc.h>
47 #include <sys/taskqueue.h>
48 #include <sys/fcntl.h>
51 #include <sys/mutex.h>
52 #include <sys/racct.h>
53 #include <sys/refcount.h>
55 #include <sys/sysent.h>
56 #include <sys/namei.h>
57 #include <sys/mount.h>
58 #include <sys/queue.h>
59 #include <sys/socket.h>
60 #include <sys/syscallsubr.h>
61 #include <sys/sysctl.h>
62 #include <sys/vnode.h>
67 #include <netinet/in.h>
72 #include <netinet6/in6_var.h>
76 #include <security/mac/mac_framework.h>
78 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000"
80 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
81 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures");
83 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */
86 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
88 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
92 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
94 #define _PR_IP_SADDRSEL 0
98 /* prison0 describes what is "real" about the system. */
99 struct prison prison0 = {
105 .pr_securelevel = -1,
107 .pr_childmax = JAIL_MAX,
108 .pr_hostuuid = DEFAULT_HOSTUUID,
109 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
111 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
113 .pr_flags = PR_HOST|_PR_IP_SADDRSEL,
115 .pr_allow = PR_ALLOW_ALL,
117 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
119 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */
120 struct sx allprison_lock;
121 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
122 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
123 LIST_HEAD(, prison_racct) allprison_racct;
126 static int do_jail_attach(struct thread *td, struct prison *pr);
127 static void prison_complete(void *context, int pending);
128 static void prison_deref(struct prison *pr, int flags);
129 static char *prison_path(struct prison *pr1, struct prison *pr2);
130 static void prison_remove_one(struct prison *pr);
132 static void prison_racct_attach(struct prison *pr);
133 static void prison_racct_modify(struct prison *pr);
134 static void prison_racct_detach(struct prison *pr);
137 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia);
138 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4);
141 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6);
142 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6);
145 /* Flags for prison_deref */
146 #define PD_DEREF 0x01
147 #define PD_DEUREF 0x02
148 #define PD_LOCKED 0x04
149 #define PD_LIST_SLOCKED 0x08
150 #define PD_LIST_XLOCKED 0x10
153 * Parameter names corresponding to PR_* flag values. Size values are for kvm
154 * as we cannot figure out the size of a sparse array, or an array without a
157 static char *pr_flag_names[] = {
160 [7] = "ip4.saddrsel",
163 [8] = "ip6.saddrsel",
166 const size_t pr_flag_names_size = sizeof(pr_flag_names);
168 static char *pr_flag_nonames[] = {
171 [7] = "ip4.nosaddrsel",
174 [8] = "ip6.nosaddrsel",
177 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames);
179 struct jailsys_flags {
183 } pr_flag_jailsys[] = {
184 { "host", 0, PR_HOST },
186 { "vnet", 0, PR_VNET },
189 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER },
192 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER },
195 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
197 static char *pr_allow_names[] = {
198 "allow.set_hostname",
206 "allow.mount.nullfs",
208 "allow.mount.procfs",
210 const size_t pr_allow_names_size = sizeof(pr_allow_names);
212 static char *pr_allow_nonames[] = {
213 "allow.noset_hostname",
215 "allow.noraw_sockets",
220 "allow.mount.nodevfs",
221 "allow.mount.nonullfs",
223 "allow.mount.noprocfs",
225 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames);
227 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME
228 #define JAIL_DEFAULT_ENFORCE_STATFS 2
229 #define JAIL_DEFAULT_DEVFS_RSNUM 0
230 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
231 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
232 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
233 #if defined(INET) || defined(INET6)
234 static unsigned jail_max_af_ips = 255;
239 qcmp_v4(const void *ip1, const void *ip2)
244 * We need to compare in HBO here to get the list sorted as expected
245 * by the result of the code. Sorting NBO addresses gives you
246 * interesting results. If you do not understand, do not try.
248 iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
249 iab = ntohl(((const struct in_addr *)ip2)->s_addr);
252 * Do not simply return the difference of the two numbers, the int is
266 qcmp_v6(const void *ip1, const void *ip2)
268 const struct in6_addr *ia6a, *ia6b;
271 ia6a = (const struct in6_addr *)ip1;
272 ia6b = (const struct in6_addr *)ip2;
275 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
276 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
278 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
291 sys_jail(struct thread *td, struct jail_args *uap)
297 error = copyin(uap->jail, &version, sizeof(uint32_t));
306 /* FreeBSD single IPv4 jails. */
307 bzero(&j, sizeof(struct jail));
308 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
311 j.version = j0.version;
313 j.hostname = j0.hostname;
314 j.ip4s = j0.ip_number;
320 * Version 1 was used by multi-IPv4 jail implementations
321 * that never made it into the official kernel.
325 case 2: /* JAIL_API_VERSION */
326 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
327 error = copyin(uap->jail, &j, sizeof(struct jail));
333 /* Sci-Fi jails are not supported, sorry. */
336 return (kern_jail(td, &j));
340 kern_jail(struct thread *td, struct jail *j)
342 struct iovec optiov[2 * (4
343 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0])
352 char *u_path, *u_hostname, *u_name;
355 struct in_addr *u_ip4;
358 struct in6_addr *u_ip6;
361 int error, enforce_statfs, fi;
363 bzero(&optiov, sizeof(optiov));
364 opt.uio_iov = optiov;
368 opt.uio_segflg = UIO_SYSSPACE;
369 opt.uio_rw = UIO_READ;
372 /* Set permissions for top-level jails from sysctls. */
373 if (!jailed(td->td_ucred)) {
374 for (fi = 0; fi < sizeof(pr_allow_names) /
375 sizeof(pr_allow_names[0]); fi++) {
376 optiov[opt.uio_iovcnt].iov_base =
377 (jail_default_allow & (1 << fi))
378 ? pr_allow_names[fi] : pr_allow_nonames[fi];
379 optiov[opt.uio_iovcnt].iov_len =
380 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
383 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
384 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
386 enforce_statfs = jail_default_enforce_statfs;
387 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
388 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
392 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
394 ip4s = (j->version == 0) ? 1 : j->ip4s;
395 if (ip4s > jail_max_af_ips)
397 tmplen += ip4s * sizeof(struct in_addr);
403 if (j->ip6s > jail_max_af_ips)
405 tmplen += j->ip6s * sizeof(struct in6_addr);
410 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
411 u_hostname = u_path + MAXPATHLEN;
412 u_name = u_hostname + MAXHOSTNAMELEN;
414 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
418 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
420 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
423 optiov[opt.uio_iovcnt].iov_base = "path";
424 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
426 optiov[opt.uio_iovcnt].iov_base = u_path;
427 error = copyinstr(j->path, u_path, MAXPATHLEN,
428 &optiov[opt.uio_iovcnt].iov_len);
430 free(u_path, M_TEMP);
434 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
435 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
437 optiov[opt.uio_iovcnt].iov_base = u_hostname;
438 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
439 &optiov[opt.uio_iovcnt].iov_len);
441 free(u_path, M_TEMP);
445 if (j->jailname != NULL) {
446 optiov[opt.uio_iovcnt].iov_base = "name";
447 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
449 optiov[opt.uio_iovcnt].iov_base = u_name;
450 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
451 &optiov[opt.uio_iovcnt].iov_len);
453 free(u_path, M_TEMP);
459 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
460 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
462 optiov[opt.uio_iovcnt].iov_base = u_ip4;
463 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
465 u_ip4->s_addr = j->ip4s;
467 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
469 free(u_path, M_TEMP);
476 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
477 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
479 optiov[opt.uio_iovcnt].iov_base = u_ip6;
480 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
481 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
483 free(u_path, M_TEMP);
488 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]),
489 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
490 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
491 free(u_path, M_TEMP);
497 * struct jail_set_args {
498 * struct iovec *iovp;
499 * unsigned int iovcnt;
504 sys_jail_set(struct thread *td, struct jail_set_args *uap)
509 /* Check that we have an even number of iovecs. */
513 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
516 error = kern_jail_set(td, auio, uap->flags);
522 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
529 struct in6_addr *ip6;
532 struct vfsoptlist *opts;
533 struct prison *pr, *deadpr, *mypr, *ppr, *tpr;
535 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
537 #if defined(INET) || defined(INET6)
542 size_t namelen, onamelen;
543 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos;
544 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
545 int fi, jid, jsys, len, level;
546 int childmax, rsnum, slevel;
547 int fullpath_disabled;
548 #if defined(INET) || defined(INET6)
557 uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
561 error = priv_check(td, PRIV_JAIL_SET);
562 if (!error && (flags & JAIL_ATTACH))
563 error = priv_check(td, PRIV_JAIL_ATTACH);
566 mypr = ppr = td->td_ucred->cr_prison;
567 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
569 if (flags & ~JAIL_SET_MASK)
573 * Check all the parameters before committing to anything. Not all
574 * errors can be caught early, but we may as well try. Also, this
575 * takes care of some expensive stuff (path lookup) before getting
576 * the allprison lock.
578 * XXX Jails are not filesystems, and jail parameters are not mount
579 * options. But it makes more sense to re-use the vfsopt code
580 * than duplicate it under a different name.
582 error = vfs_buildopts(optuio, &opts);
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 (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
638 if (pr_flag_names[fi] == NULL)
640 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi);
641 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi);
643 ch_flags |= pr_flags;
644 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
646 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys,
653 case JAIL_SYS_DISABLE:
654 if (!pr_flag_jailsys[fi].disable) {
658 pr_flags |= pr_flag_jailsys[fi].disable;
661 pr_flags |= pr_flag_jailsys[fi].new;
663 case JAIL_SYS_INHERIT:
670 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable;
672 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE
673 && !(pr_flags & PR_PERSIST)) {
675 vfs_opterror(opts, "new jail must persist or attach");
679 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
681 vfs_opterror(opts, "vnet cannot be changed after creation");
686 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
688 vfs_opterror(opts, "ip4 cannot be changed after creation");
693 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
695 vfs_opterror(opts, "ip6 cannot be changed after creation");
700 pr_allow = ch_allow = 0;
701 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
703 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi);
704 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi);
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);
800 ip4s = (pr_flags & PR_IP4_DISABLE) ? 0 : -1;
803 else if (ip4s & (sizeof(*ip4) - 1)) {
807 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE;
809 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE;
811 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER;
812 ip4s /= sizeof(*ip4);
813 if (ip4s > jail_max_af_ips) {
815 vfs_opterror(opts, "too many IPv4 addresses");
818 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
819 bcopy(op, ip4, ip4s * sizeof(*ip4));
821 * IP addresses are all sorted but ip[0] to preserve
822 * the primary IP address as given from userland.
823 * This special IP is used for unbound outgoing
824 * connections as well for "loopback" traffic in case
825 * source address selection cannot find any more fitting
826 * address to connect from.
829 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4);
831 * Check for duplicate addresses and do some simple
832 * zero and broadcast checks. If users give other bogus
833 * addresses it is their problem.
835 * We do not have to care about byte order for these
836 * checks so we will do them in NBO.
838 for (ii = 0; ii < ip4s; ii++) {
839 if (ip4[ii].s_addr == INADDR_ANY ||
840 ip4[ii].s_addr == INADDR_BROADCAST) {
845 (ip4[0].s_addr == ip4[ii+1].s_addr ||
846 ip4[ii].s_addr == ip4[ii+1].s_addr)) {
856 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
858 ip6s = (pr_flags & PR_IP6_DISABLE) ? 0 : -1;
861 else if (ip6s & (sizeof(*ip6) - 1)) {
865 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE;
867 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE;
869 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER;
870 ip6s /= sizeof(*ip6);
871 if (ip6s > jail_max_af_ips) {
873 vfs_opterror(opts, "too many IPv6 addresses");
876 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
877 bcopy(op, ip6, ip6s * sizeof(*ip6));
879 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6);
880 for (ii = 0; ii < ip6s; ii++) {
881 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
886 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
887 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
897 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
898 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
901 "vnet jails cannot have IP address restrictions");
906 fullpath_disabled = 0;
908 error = vfs_getopt(opts, "path", (void **)&path, &len);
914 if (flags & JAIL_UPDATE) {
917 "path cannot be changed after creation");
920 if (len == 0 || path[len - 1] != '\0') {
924 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
930 NDFREE(&nd, NDF_ONLY_PNBUF);
931 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
932 strlcpy(g_path, path, MAXPATHLEN);
933 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
936 else if (error == ENODEV) {
937 /* proceed if sysctl debug.disablefullpath == 1 */
938 fullpath_disabled = 1;
939 if (len < 2 || (len == 2 && path[0] == '/'))
942 /* exit on other errors */
945 if (root->v_type != VDIR) {
951 if (fullpath_disabled) {
952 /* Leave room for a real-root full pathname. */
953 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/")
954 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) {
955 error = ENAMETOOLONG;
962 * Grab the allprison lock before letting modules check their
963 * parameters. Once we have it, do not let go so we'll have a
964 * consistent view of the OSD list.
966 sx_xlock(&allprison_lock);
967 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts);
969 goto done_unlock_list;
971 /* By now, all parameters should have been noted. */
972 TAILQ_FOREACH(opt, opts, link) {
973 if (!opt->seen && strcmp(opt->name, "errmsg")) {
975 vfs_opterror(opts, "unknown parameter: %s", opt->name);
976 goto done_unlock_list;
981 * See if we are creating a new record or updating an existing one.
982 * This abuses the file error codes ENOENT and EEXIST.
984 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
987 vfs_opterror(opts, "no valid operation (create or update)");
988 goto done_unlock_list;
992 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
993 namelc = strrchr(name, '.');
994 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
1000 * See if a requested jid already exists. There is an
1001 * information leak here if the jid exists but is not within
1002 * the caller's jail hierarchy. Jail creators will get EEXIST
1003 * even though they cannot see the jail, and CREATE | UPDATE
1004 * will return ENOENT which is not normally a valid error.
1008 vfs_opterror(opts, "negative jid");
1009 goto done_unlock_list;
1011 pr = prison_find(jid);
1013 ppr = pr->pr_parent;
1014 /* Create: jid must not exist. */
1015 if (cuflags == JAIL_CREATE) {
1016 mtx_unlock(&pr->pr_mtx);
1018 vfs_opterror(opts, "jail %d already exists",
1020 goto done_unlock_list;
1022 if (!prison_ischild(mypr, pr)) {
1023 mtx_unlock(&pr->pr_mtx);
1025 } else if (pr->pr_uref == 0) {
1026 if (!(flags & JAIL_DYING)) {
1027 mtx_unlock(&pr->pr_mtx);
1029 vfs_opterror(opts, "jail %d is dying",
1031 goto done_unlock_list;
1032 } else if ((flags & JAIL_ATTACH) ||
1033 (pr_flags & PR_PERSIST)) {
1035 * A dying jail might be resurrected
1036 * (via attach or persist), but first
1037 * it must determine if another jail
1038 * has claimed its name. Accomplish
1039 * this by implicitly re-setting the
1043 name = prison_name(mypr, pr);
1048 /* Update: jid must exist. */
1049 if (cuflags == JAIL_UPDATE) {
1051 vfs_opterror(opts, "jail %d not found", jid);
1052 goto done_unlock_list;
1057 * If the caller provided a name, look for a jail by that name.
1058 * This has different semantics for creates and updates keyed by jid
1059 * (where the name must not already exist in a different jail),
1060 * and updates keyed by the name itself (where the name must exist
1061 * because that is the jail being updated).
1064 namelc = strrchr(name, '.');
1069 * This is a hierarchical name. Split it into the
1070 * parent and child names, and make sure the parent
1071 * exists or matches an already found jail.
1075 if (strncmp(name, ppr->pr_name, namelc - name)
1076 || ppr->pr_name[namelc - name] != '\0') {
1077 mtx_unlock(&pr->pr_mtx);
1080 "cannot change jail's parent");
1081 goto done_unlock_list;
1084 ppr = prison_find_name(mypr, name);
1088 "jail \"%s\" not found", name);
1089 goto done_unlock_list;
1091 mtx_unlock(&ppr->pr_mtx);
1095 if (name[0] != '\0') {
1097 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1100 FOREACH_PRISON_CHILD(ppr, tpr) {
1101 if (tpr != pr && tpr->pr_ref > 0 &&
1102 !strcmp(tpr->pr_name + namelen, name)) {
1104 cuflags != JAIL_CREATE) {
1105 mtx_lock(&tpr->pr_mtx);
1106 if (tpr->pr_ref > 0) {
1111 if (tpr->pr_uref > 0) {
1117 mtx_unlock(&tpr->pr_mtx);
1118 } else if (tpr->pr_uref > 0) {
1120 * Create, or update(jid):
1121 * name must not exist in an
1122 * active sibling jail.
1126 mtx_unlock(&pr->pr_mtx);
1128 "jail \"%s\" already exists",
1130 goto done_unlock_list;
1134 /* If no active jail is found, use a dying one. */
1135 if (deadpr != NULL && pr == NULL) {
1136 if (flags & JAIL_DYING) {
1137 mtx_lock(&deadpr->pr_mtx);
1138 if (deadpr->pr_ref == 0) {
1139 mtx_unlock(&deadpr->pr_mtx);
1143 } else if (cuflags == JAIL_UPDATE) {
1146 "jail \"%s\" is dying", name);
1147 goto done_unlock_list;
1150 /* Update: name must exist if no jid. */
1151 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1153 vfs_opterror(opts, "jail \"%s\" not found",
1155 goto done_unlock_list;
1159 /* Update: must provide a jid or name. */
1160 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1162 vfs_opterror(opts, "update specified no jail");
1163 goto done_unlock_list;
1166 /* If there's no prison to update, create a new one and link it in. */
1168 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1169 if (tpr->pr_childcount >= tpr->pr_childmax) {
1171 vfs_opterror(opts, "prison limit exceeded");
1172 goto done_unlock_list;
1175 mtx_lock(&ppr->pr_mtx);
1176 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) {
1177 mtx_unlock(&ppr->pr_mtx);
1179 vfs_opterror(opts, "parent jail went away!");
1180 goto done_unlock_list;
1184 mtx_unlock(&ppr->pr_mtx);
1185 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1187 /* Find the next free jid. */
1190 if (jid == JAIL_MAX)
1192 TAILQ_FOREACH(tpr, &allprison, pr_list) {
1193 if (tpr->pr_id < jid)
1195 if (tpr->pr_id > jid || tpr->pr_ref == 0) {
1196 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1199 if (jid == lastprid) {
1202 "no available jail IDs");
1204 prison_deref(ppr, PD_DEREF |
1205 PD_DEUREF | PD_LIST_XLOCKED);
1214 * The jail already has a jid (that did not yet exist),
1215 * so just find where to insert it.
1217 TAILQ_FOREACH(tpr, &allprison, pr_list)
1218 if (tpr->pr_id >= jid) {
1219 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1224 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1225 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1226 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1227 tpr->pr_childcount++;
1229 pr->pr_parent = ppr;
1232 /* Set some default values, and inherit some from the parent. */
1237 root = mypr->pr_root;
1240 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1241 pr->pr_flags |= PR_HOST;
1242 #if defined(INET) || defined(INET6)
1244 if (!(pr_flags & PR_VNET))
1248 if (!(ch_flags & PR_IP4_USER))
1250 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE;
1251 else if (!(pr_flags & PR_IP4_USER)) {
1252 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1253 if (ppr->pr_ip4 != NULL) {
1254 pr->pr_ip4s = ppr->pr_ip4s;
1255 pr->pr_ip4 = malloc(pr->pr_ip4s *
1256 sizeof(struct in_addr), M_PRISON,
1258 bcopy(ppr->pr_ip4, pr->pr_ip4,
1259 pr->pr_ip4s * sizeof(*pr->pr_ip4));
1264 if (!(ch_flags & PR_IP6_USER))
1266 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE;
1267 else if (!(pr_flags & PR_IP6_USER)) {
1268 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1269 if (ppr->pr_ip6 != NULL) {
1270 pr->pr_ip6s = ppr->pr_ip6s;
1271 pr->pr_ip6 = malloc(pr->pr_ip6s *
1272 sizeof(struct in6_addr), M_PRISON,
1274 bcopy(ppr->pr_ip6, pr->pr_ip6,
1275 pr->pr_ip6s * sizeof(*pr->pr_ip6));
1281 /* Source address selection is always on by default. */
1282 pr->pr_flags |= _PR_IP_SADDRSEL;
1284 pr->pr_securelevel = ppr->pr_securelevel;
1285 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1286 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
1287 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
1289 LIST_INIT(&pr->pr_children);
1290 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1293 /* Allocate a new vnet if specified. */
1294 pr->pr_vnet = (pr_flags & PR_VNET)
1295 ? vnet_alloc() : ppr->pr_vnet;
1298 * Allocate a dedicated cpuset for each jail.
1299 * Unlike other initial settings, this may return an erorr.
1301 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1303 prison_deref(pr, PD_LIST_XLOCKED);
1307 mtx_lock(&pr->pr_mtx);
1309 * New prisons do not yet have a reference, because we do not
1310 * want other to see the incomplete prison once the
1311 * allprison_lock is downgraded.
1316 * Grab a reference for existing prisons, to ensure they
1317 * continue to exist for the duration of the call.
1320 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1321 if ((pr->pr_flags & PR_VNET) &&
1322 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1325 "vnet jails cannot have IP address restrictions");
1326 goto done_deref_locked;
1330 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1333 "ip4 cannot be changed after creation");
1334 goto done_deref_locked;
1338 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1341 "ip6 cannot be changed after creation");
1342 goto done_deref_locked;
1347 /* Do final error checking before setting anything. */
1349 if (slevel < ppr->pr_securelevel) {
1351 goto done_deref_locked;
1355 if (childmax >= ppr->pr_childmax) {
1357 goto done_deref_locked;
1361 if (enforce < ppr->pr_enforce_statfs) {
1363 goto done_deref_locked;
1368 * devfs_rsnum is a uint16_t
1370 if (rsnum < 0 || rsnum > 65535) {
1372 goto done_deref_locked;
1375 * Nested jails always inherit parent's devfs ruleset
1377 if (jailed(td->td_ucred)) {
1378 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
1380 goto done_deref_locked;
1382 rsnum = ppr->pr_devfs_rsnum;
1387 if (ppr->pr_flags & PR_IP4) {
1389 * Make sure the new set of IP addresses is a
1390 * subset of the parent's list. Don't worry
1391 * about the parent being unlocked, as any
1392 * setting is done with allprison_lock held.
1394 for (ij = 0; ij < ppr->pr_ip4s; ij++)
1395 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
1397 if (ij == ppr->pr_ip4s) {
1399 goto done_deref_locked;
1402 for (ii = ij = 1; ii < ip4s; ii++) {
1403 if (ip4[ii].s_addr ==
1404 ppr->pr_ip4[0].s_addr)
1406 for (; ij < ppr->pr_ip4s; ij++)
1407 if (ip4[ii].s_addr ==
1408 ppr->pr_ip4[ij].s_addr)
1410 if (ij == ppr->pr_ip4s)
1413 if (ij == ppr->pr_ip4s) {
1415 goto done_deref_locked;
1420 * Check for conflicting IP addresses. We permit them
1421 * if there is no more than one IP on each jail. If
1422 * there is a duplicate on a jail with more than one
1423 * IP stop checking and return error.
1427 for (; tppr != &prison0; tppr = tppr->pr_parent)
1428 if (tppr->pr_flags & PR_VNET)
1431 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1434 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1436 tpr->pr_uref == 0) {
1440 if (!(tpr->pr_flags & PR_IP4_USER))
1443 if (tpr->pr_ip4 == NULL ||
1444 (ip4s == 1 && tpr->pr_ip4s == 1))
1446 for (ii = 0; ii < ip4s; ii++) {
1447 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) {
1450 "IPv4 addresses clash");
1451 goto done_deref_locked;
1459 if (ppr->pr_flags & PR_IP6) {
1461 * Make sure the new set of IP addresses is a
1462 * subset of the parent's list.
1464 for (ij = 0; ij < ppr->pr_ip6s; ij++)
1465 if (IN6_ARE_ADDR_EQUAL(&ip6[0],
1468 if (ij == ppr->pr_ip6s) {
1470 goto done_deref_locked;
1473 for (ii = ij = 1; ii < ip6s; ii++) {
1474 if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
1477 for (; ij < ppr->pr_ip6s; ij++)
1478 if (IN6_ARE_ADDR_EQUAL(
1479 &ip6[ii], &ppr->pr_ip6[ij]))
1481 if (ij == ppr->pr_ip6s)
1484 if (ij == ppr->pr_ip6s) {
1486 goto done_deref_locked;
1490 /* Check for conflicting IP addresses. */
1493 for (; tppr != &prison0; tppr = tppr->pr_parent)
1494 if (tppr->pr_flags & PR_VNET)
1497 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1500 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1502 tpr->pr_uref == 0) {
1506 if (!(tpr->pr_flags & PR_IP6_USER))
1509 if (tpr->pr_ip6 == NULL ||
1510 (ip6s == 1 && tpr->pr_ip6s == 1))
1512 for (ii = 0; ii < ip6s; ii++) {
1513 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) {
1516 "IPv6 addresses clash");
1517 goto done_deref_locked;
1523 onamelen = namelen = 0;
1525 /* Give a default name of the jid. */
1526 if (name[0] == '\0')
1527 snprintf(name = numbuf, sizeof(numbuf), "%d", jid);
1528 else if (*namelc == '0' || (strtoul(namelc, &p, 10) != jid &&
1532 "name cannot be numeric (unless it is the jid)");
1533 goto done_deref_locked;
1536 * Make sure the name isn't too long for the prison or its
1539 onamelen = strlen(pr->pr_name);
1540 namelen = strlen(name);
1541 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) {
1542 error = ENAMETOOLONG;
1543 goto done_deref_locked;
1545 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1546 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
1547 sizeof(pr->pr_name)) {
1548 error = ENAMETOOLONG;
1549 goto done_deref_locked;
1553 if (pr_allow & ~ppr->pr_allow) {
1555 goto done_deref_locked;
1558 /* Set the parameters of the prison. */
1561 if (pr_flags & PR_IP4_USER) {
1562 pr->pr_flags |= PR_IP4;
1563 free(pr->pr_ip4, M_PRISON);
1567 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1569 if (tpr->pr_flags & PR_VNET) {
1574 if (prison_restrict_ip4(tpr, NULL)) {
1583 if (pr_flags & PR_IP6_USER) {
1584 pr->pr_flags |= PR_IP6;
1585 free(pr->pr_ip6, M_PRISON);
1589 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1591 if (tpr->pr_flags & PR_VNET) {
1596 if (prison_restrict_ip6(tpr, NULL)) {
1604 pr->pr_securelevel = slevel;
1605 /* Set all child jails to be at least this level. */
1606 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1607 if (tpr->pr_securelevel < slevel)
1608 tpr->pr_securelevel = slevel;
1611 pr->pr_childmax = childmax;
1612 /* Set all child jails to under this limit. */
1613 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
1614 if (tpr->pr_childmax > childmax - level)
1615 tpr->pr_childmax = childmax > level
1616 ? childmax - level : 0;
1619 pr->pr_enforce_statfs = enforce;
1620 /* Pass this restriction on to the children. */
1621 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1622 if (tpr->pr_enforce_statfs < enforce)
1623 tpr->pr_enforce_statfs = enforce;
1626 pr->pr_devfs_rsnum = rsnum;
1627 /* Pass this restriction on to the children. */
1628 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1629 tpr->pr_devfs_rsnum = rsnum;
1632 if (ppr == &prison0)
1633 strlcpy(pr->pr_name, name, sizeof(pr->pr_name));
1635 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
1636 ppr->pr_name, name);
1637 /* Change this component of child names. */
1638 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1639 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
1640 strlen(tpr->pr_name + onamelen) + 1);
1641 bcopy(pr->pr_name, tpr->pr_name, namelen);
1645 /* Try to keep a real-rooted full pathname. */
1646 if (fullpath_disabled && path[0] == '/' &&
1647 strcmp(mypr->pr_path, "/"))
1648 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s",
1649 mypr->pr_path, path);
1651 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
1654 if (PR_HOST & ch_flags & ~pr_flags) {
1655 if (pr->pr_flags & PR_HOST) {
1657 * Copy the parent's host info. As with pr_ip4 above,
1658 * the lack of a lock on the parent is not a problem;
1659 * it is always set with allprison_lock at least
1660 * shared, and is held exclusively here.
1662 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
1663 sizeof(pr->pr_hostname));
1664 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
1665 sizeof(pr->pr_domainname));
1666 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
1667 sizeof(pr->pr_hostuuid));
1668 pr->pr_hostid = pr->pr_parent->pr_hostid;
1670 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
1671 /* Set this prison, and any descendants without PR_HOST. */
1673 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
1675 strlcpy(pr->pr_domainname, domain,
1676 sizeof(pr->pr_domainname));
1678 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
1680 pr->pr_hostid = hid;
1681 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1682 if (tpr->pr_flags & PR_HOST)
1686 strlcpy(tpr->pr_hostname,
1688 sizeof(tpr->pr_hostname));
1690 strlcpy(tpr->pr_domainname,
1692 sizeof(tpr->pr_domainname));
1694 strlcpy(tpr->pr_hostuuid,
1696 sizeof(tpr->pr_hostuuid));
1698 tpr->pr_hostid = hid;
1702 if ((tallow = ch_allow & ~pr_allow)) {
1703 /* Clear allow bits in all children. */
1704 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1705 tpr->pr_allow &= ~tallow;
1707 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
1709 * Persistent prisons get an extra reference, and prisons losing their
1710 * persist flag lose that reference. Only do this for existing prisons
1711 * for now, so new ones will remain unseen until after the module
1712 * handlers have completed.
1714 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) {
1715 if (pr_flags & PR_PERSIST) {
1723 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
1724 mtx_unlock(&pr->pr_mtx);
1728 prison_racct_attach(pr);
1731 /* Locks may have prevented a complete restriction of child IP
1732 * addresses. If so, allocate some more memory and try again.
1737 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
1738 mtx_lock(&pr->pr_mtx);
1740 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1742 if (tpr->pr_flags & PR_VNET) {
1747 if (prison_restrict_ip4(tpr, ip4)) {
1754 mtx_unlock(&pr->pr_mtx);
1760 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
1761 mtx_lock(&pr->pr_mtx);
1763 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1765 if (tpr->pr_flags & PR_VNET) {
1770 if (prison_restrict_ip6(tpr, ip6)) {
1777 mtx_unlock(&pr->pr_mtx);
1781 /* Let the modules do their work. */
1782 sx_downgrade(&allprison_lock);
1784 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
1786 prison_deref(pr, PD_LIST_SLOCKED);
1790 error = osd_jail_call(pr, PR_METHOD_SET, opts);
1792 prison_deref(pr, created
1794 : PD_DEREF | PD_LIST_SLOCKED);
1798 /* Attach this process to the prison if requested. */
1799 if (flags & JAIL_ATTACH) {
1800 mtx_lock(&pr->pr_mtx);
1801 error = do_jail_attach(td, pr);
1803 vfs_opterror(opts, "attach failed");
1805 prison_deref(pr, PD_DEREF);
1812 sx_sunlock(&allprison_lock);
1813 prison_racct_modify(pr);
1814 sx_slock(&allprison_lock);
1818 td->td_retval[0] = pr->pr_id;
1821 * Now that it is all there, drop the temporary reference from existing
1822 * prisons. Or add a reference to newly created persistent prisons
1823 * (which was not done earlier so that the prison would not be publicly
1827 prison_deref(pr, (flags & JAIL_ATTACH)
1829 : PD_DEREF | PD_LIST_SLOCKED);
1831 if (pr_flags & PR_PERSIST) {
1832 mtx_lock(&pr->pr_mtx);
1835 mtx_unlock(&pr->pr_mtx);
1837 if (!(flags & JAIL_ATTACH))
1838 sx_sunlock(&allprison_lock);
1844 prison_deref(pr, created
1845 ? PD_LOCKED | PD_LIST_XLOCKED
1846 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
1849 sx_xunlock(&allprison_lock);
1855 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
1856 if (errmsg_len > 0) {
1857 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
1858 if (errmsg_pos > 0) {
1859 if (optuio->uio_segflg == UIO_SYSSPACE)
1861 optuio->uio_iov[errmsg_pos].iov_base,
1865 optuio->uio_iov[errmsg_pos].iov_base,
1872 free(ip4, M_PRISON);
1875 free(ip6, M_PRISON);
1878 free(g_path, M_TEMP);
1885 * struct jail_get_args {
1886 * struct iovec *iovp;
1887 * unsigned int iovcnt;
1892 sys_jail_get(struct thread *td, struct jail_get_args *uap)
1897 /* Check that we have an even number of iovecs. */
1898 if (uap->iovcnt & 1)
1901 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
1904 error = kern_jail_get(td, auio, uap->flags);
1906 error = copyout(auio->uio_iov, uap->iovp,
1907 uap->iovcnt * sizeof (struct iovec));
1913 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
1915 struct prison *pr, *mypr;
1917 struct vfsoptlist *opts;
1918 char *errmsg, *name;
1919 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos;
1921 if (flags & ~JAIL_GET_MASK)
1924 /* Get the parameter list. */
1925 error = vfs_buildopts(optuio, &opts);
1928 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
1929 mypr = td->td_ucred->cr_prison;
1932 * Find the prison specified by one of: lastjid, jid, name.
1934 sx_slock(&allprison_lock);
1935 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
1937 TAILQ_FOREACH(pr, &allprison, pr_list) {
1938 if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
1939 mtx_lock(&pr->pr_mtx);
1940 if (pr->pr_ref > 0 &&
1941 (pr->pr_uref > 0 || (flags & JAIL_DYING)))
1943 mtx_unlock(&pr->pr_mtx);
1949 vfs_opterror(opts, "no jail after %d", jid);
1950 goto done_unlock_list;
1951 } else if (error != ENOENT)
1952 goto done_unlock_list;
1954 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
1957 pr = prison_find_child(mypr, jid);
1959 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1960 mtx_unlock(&pr->pr_mtx);
1962 vfs_opterror(opts, "jail %d is dying",
1964 goto done_unlock_list;
1969 vfs_opterror(opts, "jail %d not found", jid);
1970 goto done_unlock_list;
1972 } else if (error != ENOENT)
1973 goto done_unlock_list;
1975 error = vfs_getopt(opts, "name", (void **)&name, &len);
1977 if (len == 0 || name[len - 1] != '\0') {
1979 goto done_unlock_list;
1981 pr = prison_find_name(mypr, name);
1983 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1984 mtx_unlock(&pr->pr_mtx);
1986 vfs_opterror(opts, "jail \"%s\" is dying",
1988 goto done_unlock_list;
1993 vfs_opterror(opts, "jail \"%s\" not found", name);
1994 goto done_unlock_list;
1995 } else if (error != ENOENT)
1996 goto done_unlock_list;
1998 vfs_opterror(opts, "no jail specified");
2000 goto done_unlock_list;
2003 /* Get the parameters of the prison. */
2006 td->td_retval[0] = pr->pr_id;
2007 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
2008 if (error != 0 && error != ENOENT)
2010 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
2011 error = vfs_setopt(opts, "parent", &i, sizeof(i));
2012 if (error != 0 && error != ENOENT)
2014 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
2015 if (error != 0 && error != ENOENT)
2017 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
2018 sizeof(pr->pr_cpuset->cs_id));
2019 if (error != 0 && error != ENOENT)
2021 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
2022 if (error != 0 && error != ENOENT)
2025 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
2026 pr->pr_ip4s * sizeof(*pr->pr_ip4));
2027 if (error != 0 && error != ENOENT)
2031 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
2032 pr->pr_ip6s * sizeof(*pr->pr_ip6));
2033 if (error != 0 && error != ENOENT)
2036 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
2037 sizeof(pr->pr_securelevel));
2038 if (error != 0 && error != ENOENT)
2040 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
2041 sizeof(pr->pr_childcount));
2042 if (error != 0 && error != ENOENT)
2044 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
2045 sizeof(pr->pr_childmax));
2046 if (error != 0 && error != ENOENT)
2048 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
2049 if (error != 0 && error != ENOENT)
2051 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
2052 if (error != 0 && error != ENOENT)
2054 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
2055 if (error != 0 && error != ENOENT)
2057 #ifdef COMPAT_FREEBSD32
2058 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
2059 uint32_t hid32 = pr->pr_hostid;
2061 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
2064 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
2065 sizeof(pr->pr_hostid));
2066 if (error != 0 && error != ENOENT)
2068 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
2069 sizeof(pr->pr_enforce_statfs));
2070 if (error != 0 && error != ENOENT)
2072 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
2073 sizeof(pr->pr_devfs_rsnum));
2074 if (error != 0 && error != ENOENT)
2076 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
2078 if (pr_flag_names[fi] == NULL)
2080 i = (pr->pr_flags & (1 << fi)) ? 1 : 0;
2081 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i));
2082 if (error != 0 && error != ENOENT)
2085 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i));
2086 if (error != 0 && error != ENOENT)
2089 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
2092 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
2093 i = pr_flag_jailsys[fi].disable &&
2094 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE
2095 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW
2098 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i));
2099 if (error != 0 && error != ENOENT)
2102 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
2104 if (pr_allow_names[fi] == NULL)
2106 i = (pr->pr_allow & (1 << fi)) ? 1 : 0;
2107 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i));
2108 if (error != 0 && error != ENOENT)
2111 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i));
2112 if (error != 0 && error != ENOENT)
2115 i = (pr->pr_uref == 0);
2116 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2117 if (error != 0 && error != ENOENT)
2120 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2121 if (error != 0 && error != ENOENT)
2124 /* Get the module parameters. */
2125 mtx_unlock(&pr->pr_mtx);
2127 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2130 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
2132 /* By now, all parameters should have been noted. */
2133 TAILQ_FOREACH(opt, opts, link) {
2134 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2136 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2141 /* Write the fetched parameters back to userspace. */
2143 TAILQ_FOREACH(opt, opts, link) {
2144 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2145 pos = 2 * opt->pos + 1;
2146 optuio->uio_iov[pos].iov_len = opt->len;
2147 if (opt->value != NULL) {
2148 if (optuio->uio_segflg == UIO_SYSSPACE) {
2150 optuio->uio_iov[pos].iov_base,
2153 error = copyout(opt->value,
2154 optuio->uio_iov[pos].iov_base,
2165 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
2169 sx_sunlock(&allprison_lock);
2171 if (error && errmsg_pos >= 0) {
2172 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2173 errmsg_pos = 2 * errmsg_pos + 1;
2174 if (errmsg_len > 0) {
2175 if (optuio->uio_segflg == UIO_SYSSPACE)
2177 optuio->uio_iov[errmsg_pos].iov_base,
2181 optuio->uio_iov[errmsg_pos].iov_base,
2191 * struct jail_remove_args {
2196 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
2198 struct prison *pr, *cpr, *lpr, *tpr;
2201 error = priv_check(td, PRIV_JAIL_REMOVE);
2205 sx_xlock(&allprison_lock);
2206 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2208 sx_xunlock(&allprison_lock);
2212 /* Remove all descendants of this prison, then remove this prison. */
2214 pr->pr_flags |= PR_REMOVE;
2215 if (!LIST_EMPTY(&pr->pr_children)) {
2216 mtx_unlock(&pr->pr_mtx);
2218 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
2219 mtx_lock(&cpr->pr_mtx);
2220 if (cpr->pr_ref > 0) {
2223 cpr->pr_flags |= PR_REMOVE;
2225 /* Already removed - do not do it again. */
2228 mtx_unlock(&cpr->pr_mtx);
2230 mtx_lock(&lpr->pr_mtx);
2231 prison_remove_one(lpr);
2232 sx_xlock(&allprison_lock);
2237 mtx_lock(&lpr->pr_mtx);
2238 prison_remove_one(lpr);
2239 sx_xlock(&allprison_lock);
2241 mtx_lock(&pr->pr_mtx);
2243 prison_remove_one(pr);
2248 prison_remove_one(struct prison *pr)
2253 /* If the prison was persistent, it is not anymore. */
2255 if (pr->pr_flags & PR_PERSIST) {
2258 pr->pr_flags &= ~PR_PERSIST;
2262 * jail_remove added a reference. If that's the only one, remove
2265 KASSERT(pr->pr_ref > 0,
2266 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
2267 if (pr->pr_ref == 1) {
2269 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
2273 mtx_unlock(&pr->pr_mtx);
2274 sx_xunlock(&allprison_lock);
2276 * Kill all processes unfortunate enough to be attached to this prison.
2278 sx_slock(&allproc_lock);
2279 LIST_FOREACH(p, &allproc, p_list) {
2281 if (p->p_state != PRS_NEW && p->p_ucred &&
2282 p->p_ucred->cr_prison == pr)
2283 kern_psignal(p, SIGKILL);
2286 sx_sunlock(&allproc_lock);
2287 /* Remove the temporary reference added by jail_remove. */
2288 prison_deref(pr, deuref | PD_DEREF);
2293 * struct jail_attach_args {
2298 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
2303 error = priv_check(td, PRIV_JAIL_ATTACH);
2307 sx_slock(&allprison_lock);
2308 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2310 sx_sunlock(&allprison_lock);
2315 * Do not allow a process to attach to a prison that is not
2316 * considered to be "alive".
2318 if (pr->pr_uref == 0) {
2319 mtx_unlock(&pr->pr_mtx);
2320 sx_sunlock(&allprison_lock);
2324 return (do_jail_attach(td, pr));
2328 do_jail_attach(struct thread *td, struct prison *pr)
2332 struct ucred *newcred, *oldcred;
2336 * XXX: Note that there is a slight race here if two threads
2337 * in the same privileged process attempt to attach to two
2338 * different jails at the same time. It is important for
2339 * user processes not to do this, or they might end up with
2340 * a process root from one prison, but attached to the jail
2345 mtx_unlock(&pr->pr_mtx);
2347 /* Let modules do whatever they need to prepare for attaching. */
2348 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
2350 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
2353 sx_sunlock(&allprison_lock);
2356 * Reparent the newly attached process to this jail.
2358 ppr = td->td_ucred->cr_prison;
2360 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
2364 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
2365 if ((error = change_dir(pr->pr_root, td)) != 0)
2368 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
2371 VOP_UNLOCK(pr->pr_root, 0);
2372 if ((error = change_root(pr->pr_root, td)))
2377 oldcred = p->p_ucred;
2379 crcopy(newcred, oldcred);
2380 newcred->cr_prison = pr;
2381 p->p_ucred = newcred;
2384 racct_proc_ucred_changed(p, oldcred, newcred);
2387 prison_deref(ppr, PD_DEREF | PD_DEUREF);
2390 VOP_UNLOCK(pr->pr_root, 0);
2392 /* Tell modules this thread is still in its old jail after all. */
2393 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td);
2394 prison_deref(pr, PD_DEREF | PD_DEUREF);
2400 * Returns a locked prison instance, or NULL on failure.
2403 prison_find(int prid)
2407 sx_assert(&allprison_lock, SX_LOCKED);
2408 TAILQ_FOREACH(pr, &allprison, pr_list) {
2409 if (pr->pr_id == prid) {
2410 mtx_lock(&pr->pr_mtx);
2413 mtx_unlock(&pr->pr_mtx);
2420 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
2423 prison_find_child(struct prison *mypr, int prid)
2428 sx_assert(&allprison_lock, SX_LOCKED);
2429 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2430 if (pr->pr_id == prid) {
2431 mtx_lock(&pr->pr_mtx);
2434 mtx_unlock(&pr->pr_mtx);
2441 * Look for the name relative to mypr. Returns a locked prison or NULL.
2444 prison_find_name(struct prison *mypr, const char *name)
2446 struct prison *pr, *deadpr;
2450 sx_assert(&allprison_lock, SX_LOCKED);
2451 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
2454 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2455 if (!strcmp(pr->pr_name + mylen, name)) {
2456 mtx_lock(&pr->pr_mtx);
2457 if (pr->pr_ref > 0) {
2458 if (pr->pr_uref > 0)
2462 mtx_unlock(&pr->pr_mtx);
2465 /* There was no valid prison - perhaps there was a dying one. */
2466 if (deadpr != NULL) {
2467 mtx_lock(&deadpr->pr_mtx);
2468 if (deadpr->pr_ref == 0) {
2469 mtx_unlock(&deadpr->pr_mtx);
2477 * See if a prison has the specific flag set.
2480 prison_flag(struct ucred *cred, unsigned flag)
2483 /* This is an atomic read, so no locking is necessary. */
2484 return (cred->cr_prison->pr_flags & flag);
2488 prison_allow(struct ucred *cred, unsigned flag)
2491 /* This is an atomic read, so no locking is necessary. */
2492 return (cred->cr_prison->pr_allow & flag);
2496 * Remove a prison reference. If that was the last reference, remove the
2497 * prison itself - but not in this context in case there are locks held.
2500 prison_free_locked(struct prison *pr)
2503 mtx_assert(&pr->pr_mtx, MA_OWNED);
2505 if (pr->pr_ref == 0) {
2506 mtx_unlock(&pr->pr_mtx);
2507 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
2508 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2511 mtx_unlock(&pr->pr_mtx);
2515 prison_free(struct prison *pr)
2518 mtx_lock(&pr->pr_mtx);
2519 prison_free_locked(pr);
2523 prison_complete(void *context, int pending)
2526 prison_deref((struct prison *)context, 0);
2530 * Remove a prison reference (usually). This internal version assumes no
2531 * mutexes are held, except perhaps the prison itself. If there are no more
2532 * references, release and delist the prison. On completion, the prison lock
2533 * and the allprison lock are both unlocked.
2536 prison_deref(struct prison *pr, int flags)
2538 struct prison *ppr, *tpr;
2540 if (!(flags & PD_LOCKED))
2541 mtx_lock(&pr->pr_mtx);
2543 if (flags & PD_DEUREF) {
2545 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0"));
2547 if (flags & PD_DEREF)
2549 /* If the prison still has references, nothing else to do. */
2550 if (pr->pr_ref > 0) {
2551 mtx_unlock(&pr->pr_mtx);
2552 if (flags & PD_LIST_SLOCKED)
2553 sx_sunlock(&allprison_lock);
2554 else if (flags & PD_LIST_XLOCKED)
2555 sx_xunlock(&allprison_lock);
2559 mtx_unlock(&pr->pr_mtx);
2560 if (flags & PD_LIST_SLOCKED) {
2561 if (!sx_try_upgrade(&allprison_lock)) {
2562 sx_sunlock(&allprison_lock);
2563 sx_xlock(&allprison_lock);
2565 } else if (!(flags & PD_LIST_XLOCKED))
2566 sx_xlock(&allprison_lock);
2568 TAILQ_REMOVE(&allprison, pr, pr_list);
2569 LIST_REMOVE(pr, pr_sibling);
2570 ppr = pr->pr_parent;
2571 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
2572 tpr->pr_childcount--;
2573 sx_xunlock(&allprison_lock);
2576 if (pr->pr_vnet != ppr->pr_vnet)
2577 vnet_destroy(pr->pr_vnet);
2579 if (pr->pr_root != NULL)
2581 mtx_destroy(&pr->pr_mtx);
2583 free(pr->pr_ip4, M_PRISON);
2586 free(pr->pr_ip6, M_PRISON);
2588 if (pr->pr_cpuset != NULL)
2589 cpuset_rel(pr->pr_cpuset);
2592 prison_racct_detach(pr);
2596 /* Removing a prison frees a reference on its parent. */
2598 mtx_lock(&pr->pr_mtx);
2599 flags = PD_DEREF | PD_DEUREF;
2604 prison_hold_locked(struct prison *pr)
2607 mtx_assert(&pr->pr_mtx, MA_OWNED);
2608 KASSERT(pr->pr_ref > 0,
2609 ("Trying to hold dead prison (jid=%d).", pr->pr_id));
2614 prison_hold(struct prison *pr)
2617 mtx_lock(&pr->pr_mtx);
2618 prison_hold_locked(pr);
2619 mtx_unlock(&pr->pr_mtx);
2623 prison_proc_hold(struct prison *pr)
2626 mtx_lock(&pr->pr_mtx);
2627 KASSERT(pr->pr_uref > 0,
2628 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
2630 mtx_unlock(&pr->pr_mtx);
2634 prison_proc_free(struct prison *pr)
2637 mtx_lock(&pr->pr_mtx);
2638 KASSERT(pr->pr_uref > 0,
2639 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
2640 prison_deref(pr, PD_DEUREF | PD_LOCKED);
2646 * Restrict a prison's IP address list with its parent's, possibly replacing
2647 * it. Return true if the replacement buffer was used (or would have been).
2650 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
2655 ppr = pr->pr_parent;
2656 if (!(pr->pr_flags & PR_IP4_USER)) {
2657 /* This has no user settings, so just copy the parent's list. */
2658 if (pr->pr_ip4s < ppr->pr_ip4s) {
2660 * There's no room for the parent's list. Use the
2661 * new list buffer, which is assumed to be big enough
2662 * (if it was passed). If there's no buffer, try to
2666 if (newip4 == NULL) {
2667 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
2668 M_PRISON, M_NOWAIT);
2672 if (newip4 != NULL) {
2673 bcopy(ppr->pr_ip4, newip4,
2674 ppr->pr_ip4s * sizeof(*newip4));
2675 free(pr->pr_ip4, M_PRISON);
2676 pr->pr_ip4 = newip4;
2677 pr->pr_ip4s = ppr->pr_ip4s;
2681 pr->pr_ip4s = ppr->pr_ip4s;
2682 if (pr->pr_ip4s > 0)
2683 bcopy(ppr->pr_ip4, pr->pr_ip4,
2684 pr->pr_ip4s * sizeof(*newip4));
2685 else if (pr->pr_ip4 != NULL) {
2686 free(pr->pr_ip4, M_PRISON);
2689 } else if (pr->pr_ip4s > 0) {
2690 /* Remove addresses that aren't in the parent. */
2691 for (ij = 0; ij < ppr->pr_ip4s; ij++)
2692 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
2694 if (ij < ppr->pr_ip4s)
2697 bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
2698 --pr->pr_ip4s * sizeof(*pr->pr_ip4));
2701 for (ij = 1; ii < pr->pr_ip4s; ) {
2702 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
2706 switch (ij >= ppr->pr_ip4s ? -1 :
2707 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
2709 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
2710 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
2721 if (pr->pr_ip4s == 0) {
2722 pr->pr_flags |= PR_IP4_DISABLE;
2723 free(pr->pr_ip4, M_PRISON);
2731 * Pass back primary IPv4 address of this jail.
2733 * If not restricted return success but do not alter the address. Caller has
2734 * to make sure to initialize it correctly (e.g. INADDR_ANY).
2736 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2737 * Address returned in NBO.
2740 prison_get_ip4(struct ucred *cred, struct in_addr *ia)
2744 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2745 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2747 pr = cred->cr_prison;
2748 if (!(pr->pr_flags & PR_IP4))
2750 mtx_lock(&pr->pr_mtx);
2751 if (!(pr->pr_flags & PR_IP4)) {
2752 mtx_unlock(&pr->pr_mtx);
2755 if (pr->pr_ip4 == NULL) {
2756 mtx_unlock(&pr->pr_mtx);
2757 return (EAFNOSUPPORT);
2760 ia->s_addr = pr->pr_ip4[0].s_addr;
2761 mtx_unlock(&pr->pr_mtx);
2766 * Return 1 if we should do proper source address selection or are not jailed.
2767 * We will return 0 if we should bypass source address selection in favour
2768 * of the primary jail IPv4 address. Only in this case *ia will be updated and
2770 * Return EAFNOSUPPORT, in case this jail does not allow IPv4.
2773 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
2779 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2780 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2785 pr = cred->cr_prison;
2786 if (pr->pr_flags & PR_IP4_SADDRSEL)
2789 lia.s_addr = INADDR_ANY;
2790 error = prison_get_ip4(cred, &lia);
2793 if (lia.s_addr == INADDR_ANY)
2796 ia->s_addr = lia.s_addr;
2801 * Return true if pr1 and pr2 have the same IPv4 address restrictions.
2804 prison_equal_ip4(struct prison *pr1, struct prison *pr2)
2811 * No need to lock since the PR_IP4_USER flag can't be altered for
2814 while (pr1 != &prison0 &&
2816 !(pr1->pr_flags & PR_VNET) &&
2818 !(pr1->pr_flags & PR_IP4_USER))
2819 pr1 = pr1->pr_parent;
2820 while (pr2 != &prison0 &&
2822 !(pr2->pr_flags & PR_VNET) &&
2824 !(pr2->pr_flags & PR_IP4_USER))
2825 pr2 = pr2->pr_parent;
2826 return (pr1 == pr2);
2830 * Make sure our (source) address is set to something meaningful to this
2833 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2834 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2835 * doesn't allow IPv4. Address passed in in NBO and returned in NBO.
2838 prison_local_ip4(struct ucred *cred, struct in_addr *ia)
2844 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2845 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2847 pr = cred->cr_prison;
2848 if (!(pr->pr_flags & PR_IP4))
2850 mtx_lock(&pr->pr_mtx);
2851 if (!(pr->pr_flags & PR_IP4)) {
2852 mtx_unlock(&pr->pr_mtx);
2855 if (pr->pr_ip4 == NULL) {
2856 mtx_unlock(&pr->pr_mtx);
2857 return (EAFNOSUPPORT);
2860 ia0.s_addr = ntohl(ia->s_addr);
2861 if (ia0.s_addr == INADDR_LOOPBACK) {
2862 ia->s_addr = pr->pr_ip4[0].s_addr;
2863 mtx_unlock(&pr->pr_mtx);
2867 if (ia0.s_addr == INADDR_ANY) {
2869 * In case there is only 1 IPv4 address, bind directly.
2871 if (pr->pr_ip4s == 1)
2872 ia->s_addr = pr->pr_ip4[0].s_addr;
2873 mtx_unlock(&pr->pr_mtx);
2877 error = _prison_check_ip4(pr, ia);
2878 mtx_unlock(&pr->pr_mtx);
2883 * Rewrite destination address in case we will connect to loopback address.
2885 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2886 * Address passed in in NBO and returned in NBO.
2889 prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
2893 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2894 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2896 pr = cred->cr_prison;
2897 if (!(pr->pr_flags & PR_IP4))
2899 mtx_lock(&pr->pr_mtx);
2900 if (!(pr->pr_flags & PR_IP4)) {
2901 mtx_unlock(&pr->pr_mtx);
2904 if (pr->pr_ip4 == NULL) {
2905 mtx_unlock(&pr->pr_mtx);
2906 return (EAFNOSUPPORT);
2909 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) {
2910 ia->s_addr = pr->pr_ip4[0].s_addr;
2911 mtx_unlock(&pr->pr_mtx);
2916 * Return success because nothing had to be changed.
2918 mtx_unlock(&pr->pr_mtx);
2923 * Check if given address belongs to the jail referenced by cred/prison.
2925 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2926 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2927 * doesn't allow IPv4. Address passed in in NBO.
2930 _prison_check_ip4(struct prison *pr, struct in_addr *ia)
2935 * Check the primary IP.
2937 if (pr->pr_ip4[0].s_addr == ia->s_addr)
2941 * All the other IPs are sorted so we can do a binary search.
2944 z = pr->pr_ip4s - 2;
2947 d = qcmp_v4(&pr->pr_ip4[i+1], ia);
2956 return (EADDRNOTAVAIL);
2960 prison_check_ip4(struct ucred *cred, struct in_addr *ia)
2965 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2966 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2968 pr = cred->cr_prison;
2969 if (!(pr->pr_flags & PR_IP4))
2971 mtx_lock(&pr->pr_mtx);
2972 if (!(pr->pr_flags & PR_IP4)) {
2973 mtx_unlock(&pr->pr_mtx);
2976 if (pr->pr_ip4 == NULL) {
2977 mtx_unlock(&pr->pr_mtx);
2978 return (EAFNOSUPPORT);
2981 error = _prison_check_ip4(pr, ia);
2982 mtx_unlock(&pr->pr_mtx);
2989 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
2994 ppr = pr->pr_parent;
2995 if (!(pr->pr_flags & PR_IP6_USER)) {
2996 /* This has no user settings, so just copy the parent's list. */
2997 if (pr->pr_ip6s < ppr->pr_ip6s) {
2999 * There's no room for the parent's list. Use the
3000 * new list buffer, which is assumed to be big enough
3001 * (if it was passed). If there's no buffer, try to
3005 if (newip6 == NULL) {
3006 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
3007 M_PRISON, M_NOWAIT);
3011 if (newip6 != NULL) {
3012 bcopy(ppr->pr_ip6, newip6,
3013 ppr->pr_ip6s * sizeof(*newip6));
3014 free(pr->pr_ip6, M_PRISON);
3015 pr->pr_ip6 = newip6;
3016 pr->pr_ip6s = ppr->pr_ip6s;
3020 pr->pr_ip6s = ppr->pr_ip6s;
3021 if (pr->pr_ip6s > 0)
3022 bcopy(ppr->pr_ip6, pr->pr_ip6,
3023 pr->pr_ip6s * sizeof(*newip6));
3024 else if (pr->pr_ip6 != NULL) {
3025 free(pr->pr_ip6, M_PRISON);
3028 } else if (pr->pr_ip6s > 0) {
3029 /* Remove addresses that aren't in the parent. */
3030 for (ij = 0; ij < ppr->pr_ip6s; ij++)
3031 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
3034 if (ij < ppr->pr_ip6s)
3037 bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
3038 --pr->pr_ip6s * sizeof(*pr->pr_ip6));
3041 for (ij = 1; ii < pr->pr_ip6s; ) {
3042 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
3047 switch (ij >= ppr->pr_ip4s ? -1 :
3048 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
3050 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
3051 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
3062 if (pr->pr_ip6s == 0) {
3063 pr->pr_flags |= PR_IP6_DISABLE;
3064 free(pr->pr_ip6, M_PRISON);
3072 * Pass back primary IPv6 address for this jail.
3074 * If not restricted return success but do not alter the address. Caller has
3075 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
3077 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3080 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
3084 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3085 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3087 pr = cred->cr_prison;
3088 if (!(pr->pr_flags & PR_IP6))
3090 mtx_lock(&pr->pr_mtx);
3091 if (!(pr->pr_flags & PR_IP6)) {
3092 mtx_unlock(&pr->pr_mtx);
3095 if (pr->pr_ip6 == NULL) {
3096 mtx_unlock(&pr->pr_mtx);
3097 return (EAFNOSUPPORT);
3100 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3101 mtx_unlock(&pr->pr_mtx);
3106 * Return 1 if we should do proper source address selection or are not jailed.
3107 * We will return 0 if we should bypass source address selection in favour
3108 * of the primary jail IPv6 address. Only in this case *ia will be updated and
3110 * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
3113 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
3116 struct in6_addr lia6;
3119 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3120 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3125 pr = cred->cr_prison;
3126 if (pr->pr_flags & PR_IP6_SADDRSEL)
3130 error = prison_get_ip6(cred, &lia6);
3133 if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
3136 bcopy(&lia6, ia6, sizeof(struct in6_addr));
3141 * Return true if pr1 and pr2 have the same IPv6 address restrictions.
3144 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
3150 while (pr1 != &prison0 &&
3152 !(pr1->pr_flags & PR_VNET) &&
3154 !(pr1->pr_flags & PR_IP6_USER))
3155 pr1 = pr1->pr_parent;
3156 while (pr2 != &prison0 &&
3158 !(pr2->pr_flags & PR_VNET) &&
3160 !(pr2->pr_flags & PR_IP6_USER))
3161 pr2 = pr2->pr_parent;
3162 return (pr1 == pr2);
3166 * Make sure our (source) address is set to something meaningful to this jail.
3168 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
3169 * when needed while binding.
3171 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3172 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3173 * doesn't allow IPv6.
3176 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
3181 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3182 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3184 pr = cred->cr_prison;
3185 if (!(pr->pr_flags & PR_IP6))
3187 mtx_lock(&pr->pr_mtx);
3188 if (!(pr->pr_flags & PR_IP6)) {
3189 mtx_unlock(&pr->pr_mtx);
3192 if (pr->pr_ip6 == NULL) {
3193 mtx_unlock(&pr->pr_mtx);
3194 return (EAFNOSUPPORT);
3197 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3198 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3199 mtx_unlock(&pr->pr_mtx);
3203 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
3205 * In case there is only 1 IPv6 address, and v6only is true,
3206 * then bind directly.
3208 if (v6only != 0 && pr->pr_ip6s == 1)
3209 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3210 mtx_unlock(&pr->pr_mtx);
3214 error = _prison_check_ip6(pr, ia6);
3215 mtx_unlock(&pr->pr_mtx);
3220 * Rewrite destination address in case we will connect to loopback address.
3222 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3225 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
3229 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3230 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3232 pr = cred->cr_prison;
3233 if (!(pr->pr_flags & PR_IP6))
3235 mtx_lock(&pr->pr_mtx);
3236 if (!(pr->pr_flags & PR_IP6)) {
3237 mtx_unlock(&pr->pr_mtx);
3240 if (pr->pr_ip6 == NULL) {
3241 mtx_unlock(&pr->pr_mtx);
3242 return (EAFNOSUPPORT);
3245 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3246 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3247 mtx_unlock(&pr->pr_mtx);
3252 * Return success because nothing had to be changed.
3254 mtx_unlock(&pr->pr_mtx);
3259 * Check if given address belongs to the jail referenced by cred/prison.
3261 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3262 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3263 * doesn't allow IPv6.
3266 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6)
3271 * Check the primary IP.
3273 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
3277 * All the other IPs are sorted so we can do a binary search.
3280 z = pr->pr_ip6s - 2;
3283 d = qcmp_v6(&pr->pr_ip6[i+1], ia6);
3292 return (EADDRNOTAVAIL);
3296 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6)
3301 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3302 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3304 pr = cred->cr_prison;
3305 if (!(pr->pr_flags & PR_IP6))
3307 mtx_lock(&pr->pr_mtx);
3308 if (!(pr->pr_flags & PR_IP6)) {
3309 mtx_unlock(&pr->pr_mtx);
3312 if (pr->pr_ip6 == NULL) {
3313 mtx_unlock(&pr->pr_mtx);
3314 return (EAFNOSUPPORT);
3317 error = _prison_check_ip6(pr, ia6);
3318 mtx_unlock(&pr->pr_mtx);
3324 * Check if a jail supports the given address family.
3326 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
3330 prison_check_af(struct ucred *cred, int af)
3335 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3337 pr = cred->cr_prison;
3339 /* Prisons with their own network stack are not limited. */
3340 if (prison_owns_vnet(cred))
3349 if (pr->pr_flags & PR_IP4)
3351 mtx_lock(&pr->pr_mtx);
3352 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
3353 error = EAFNOSUPPORT;
3354 mtx_unlock(&pr->pr_mtx);
3360 if (pr->pr_flags & PR_IP6)
3362 mtx_lock(&pr->pr_mtx);
3363 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
3364 error = EAFNOSUPPORT;
3365 mtx_unlock(&pr->pr_mtx);
3373 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
3374 error = EAFNOSUPPORT;
3380 * Check if given address belongs to the jail referenced by cred (wrapper to
3381 * prison_check_ip[46]).
3383 * Returns 0 if jail doesn't restrict the address family or if address belongs
3384 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
3385 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
3388 prison_if(struct ucred *cred, struct sockaddr *sa)
3391 struct sockaddr_in *sai;
3394 struct sockaddr_in6 *sai6;
3398 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3399 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
3402 if (prison_owns_vnet(cred))
3407 switch (sa->sa_family)
3411 sai = (struct sockaddr_in *)sa;
3412 error = prison_check_ip4(cred, &sai->sin_addr);
3417 sai6 = (struct sockaddr_in6 *)sa;
3418 error = prison_check_ip6(cred, &sai6->sin6_addr);
3422 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
3423 error = EAFNOSUPPORT;
3429 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
3432 prison_check(struct ucred *cred1, struct ucred *cred2)
3435 return ((cred1->cr_prison == cred2->cr_prison ||
3436 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
3440 * Return 1 if p2 is a child of p1, otherwise 0.
3443 prison_ischild(struct prison *pr1, struct prison *pr2)
3446 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
3453 * Return 1 if the passed credential is in a jail, otherwise 0.
3456 jailed(struct ucred *cred)
3459 return (cred->cr_prison != &prison0);
3463 * Return 1 if the passed credential is in a jail and that jail does not
3464 * have its own virtual network stack, otherwise 0.
3467 jailed_without_vnet(struct ucred *cred)
3473 if (prison_owns_vnet(cred))
3481 * Return the correct hostname (domainname, et al) for the passed credential.
3484 getcredhostname(struct ucred *cred, char *buf, size_t size)
3489 * A NULL credential can be used to shortcut to the physical
3490 * system's hostname.
3492 pr = (cred != NULL) ? cred->cr_prison : &prison0;
3493 mtx_lock(&pr->pr_mtx);
3494 strlcpy(buf, pr->pr_hostname, size);
3495 mtx_unlock(&pr->pr_mtx);
3499 getcreddomainname(struct ucred *cred, char *buf, size_t size)
3502 mtx_lock(&cred->cr_prison->pr_mtx);
3503 strlcpy(buf, cred->cr_prison->pr_domainname, size);
3504 mtx_unlock(&cred->cr_prison->pr_mtx);
3508 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
3511 mtx_lock(&cred->cr_prison->pr_mtx);
3512 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
3513 mtx_unlock(&cred->cr_prison->pr_mtx);
3517 getcredhostid(struct ucred *cred, unsigned long *hostid)
3520 mtx_lock(&cred->cr_prison->pr_mtx);
3521 *hostid = cred->cr_prison->pr_hostid;
3522 mtx_unlock(&cred->cr_prison->pr_mtx);
3527 * Determine whether the prison represented by cred owns
3528 * its vnet rather than having it inherited.
3530 * Returns 1 in case the prison owns the vnet, 0 otherwise.
3533 prison_owns_vnet(struct ucred *cred)
3537 * vnets cannot be added/removed after jail creation,
3538 * so no need to lock here.
3540 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
3545 * Determine whether the subject represented by cred can "see"
3546 * status of a mount point.
3547 * Returns: 0 for permitted, ENOENT otherwise.
3548 * XXX: This function should be called cr_canseemount() and should be
3549 * placed in kern_prot.c.
3552 prison_canseemount(struct ucred *cred, struct mount *mp)
3558 pr = cred->cr_prison;
3559 if (pr->pr_enforce_statfs == 0)
3561 if (pr->pr_root->v_mount == mp)
3563 if (pr->pr_enforce_statfs == 2)
3566 * If jail's chroot directory is set to "/" we should be able to see
3567 * all mount-points from inside a jail.
3568 * This is ugly check, but this is the only situation when jail's
3569 * directory ends with '/'.
3571 if (strcmp(pr->pr_path, "/") == 0)
3573 len = strlen(pr->pr_path);
3575 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
3578 * Be sure that we don't have situation where jail's root directory
3579 * is "/some/path" and mount point is "/some/pathpath".
3581 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
3587 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
3589 char jpath[MAXPATHLEN];
3593 pr = cred->cr_prison;
3594 if (pr->pr_enforce_statfs == 0)
3596 if (prison_canseemount(cred, mp) != 0) {
3597 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3598 strlcpy(sp->f_mntonname, "[restricted]",
3599 sizeof(sp->f_mntonname));
3602 if (pr->pr_root->v_mount == mp) {
3604 * Clear current buffer data, so we are sure nothing from
3605 * the valid path left there.
3607 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3608 *sp->f_mntonname = '/';
3612 * If jail's chroot directory is set to "/" we should be able to see
3613 * all mount-points from inside a jail.
3615 if (strcmp(pr->pr_path, "/") == 0)
3617 len = strlen(pr->pr_path);
3618 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
3620 * Clear current buffer data, so we are sure nothing from
3621 * the valid path left there.
3623 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3624 if (*jpath == '\0') {
3625 /* Should never happen. */
3626 *sp->f_mntonname = '/';
3628 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
3633 * Check with permission for a specific privilege is granted within jail. We
3634 * have a specific list of accepted privileges; the rest are denied.
3637 prison_priv_check(struct ucred *cred, int priv)
3645 * Privileges specific to prisons with a virtual network stack.
3646 * There might be a duplicate entry here in case the privilege
3647 * is only granted conditionally in the legacy jail case.
3652 * NFS-specific privileges.
3654 case PRIV_NFS_DAEMON:
3655 case PRIV_NFS_LOCKD:
3658 * Network stack privileges.
3660 case PRIV_NET_BRIDGE:
3663 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
3664 case PRIV_NET_ROUTE:
3666 case PRIV_NET_SETIFMTU:
3667 case PRIV_NET_SETIFFLAGS:
3668 case PRIV_NET_SETIFCAP:
3669 case PRIV_NET_SETIFDESCR:
3670 case PRIV_NET_SETIFNAME :
3671 case PRIV_NET_SETIFMETRIC:
3672 case PRIV_NET_SETIFPHYS:
3673 case PRIV_NET_SETIFMAC:
3674 case PRIV_NET_ADDMULTI:
3675 case PRIV_NET_DELMULTI:
3676 case PRIV_NET_HWIOCTL:
3677 case PRIV_NET_SETLLADDR:
3678 case PRIV_NET_ADDIFGROUP:
3679 case PRIV_NET_DELIFGROUP:
3680 case PRIV_NET_IFCREATE:
3681 case PRIV_NET_IFDESTROY:
3682 case PRIV_NET_ADDIFADDR:
3683 case PRIV_NET_DELIFADDR:
3686 case PRIV_NET_SETIFVNET:
3687 case PRIV_NET_SETIFFIB:
3690 * 802.11-related privileges.
3692 case PRIV_NET80211_GETKEY:
3694 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */
3699 * AppleTalk privileges.
3701 case PRIV_NETATALK_RESERVEDPORT:
3706 case PRIV_NETATM_CFG:
3707 case PRIV_NETATM_ADD:
3708 case PRIV_NETATM_DEL:
3709 case PRIV_NETATM_SET:
3712 * Bluetooth privileges.
3714 case PRIV_NETBLUETOOTH_RAW:
3718 * Netgraph and netgraph module privileges.
3720 case PRIV_NETGRAPH_CONTROL:
3722 case PRIV_NETGRAPH_TTY:
3726 * IPv4 and IPv6 privileges.
3728 case PRIV_NETINET_IPFW:
3729 case PRIV_NETINET_DIVERT:
3730 case PRIV_NETINET_PF:
3731 case PRIV_NETINET_DUMMYNET:
3732 case PRIV_NETINET_CARP:
3733 case PRIV_NETINET_MROUTE:
3734 case PRIV_NETINET_RAW:
3735 case PRIV_NETINET_ADDRCTRL6:
3736 case PRIV_NETINET_ND6:
3737 case PRIV_NETINET_SCOPE6:
3738 case PRIV_NETINET_ALIFETIME6:
3739 case PRIV_NETINET_IPSEC:
3740 case PRIV_NETINET_BINDANY:
3744 * IPX/SPX privileges.
3746 case PRIV_NETIPX_RESERVEDPORT:
3747 case PRIV_NETIPX_RAW:
3761 * No default: or deny here.
3762 * In case of no permit fall through to next switch().
3764 if (cred->cr_prison->pr_flags & PR_VNET)
3772 * Allow ktrace privileges for root in jail.
3778 * Allow jailed processes to configure audit identity and
3779 * submit audit records (login, etc). In the future we may
3780 * want to further refine the relationship between audit and
3783 case PRIV_AUDIT_GETAUDIT:
3784 case PRIV_AUDIT_SETAUDIT:
3785 case PRIV_AUDIT_SUBMIT:
3789 * Allow jailed processes to manipulate process UNIX
3790 * credentials in any way they see fit.
3792 case PRIV_CRED_SETUID:
3793 case PRIV_CRED_SETEUID:
3794 case PRIV_CRED_SETGID:
3795 case PRIV_CRED_SETEGID:
3796 case PRIV_CRED_SETGROUPS:
3797 case PRIV_CRED_SETREUID:
3798 case PRIV_CRED_SETREGID:
3799 case PRIV_CRED_SETRESUID:
3800 case PRIV_CRED_SETRESGID:
3803 * Jail implements visibility constraints already, so allow
3804 * jailed root to override uid/gid-based constraints.
3806 case PRIV_SEEOTHERGIDS:
3807 case PRIV_SEEOTHERUIDS:
3810 * Jail implements inter-process debugging limits already, so
3811 * allow jailed root various debugging privileges.
3813 case PRIV_DEBUG_DIFFCRED:
3814 case PRIV_DEBUG_SUGID:
3815 case PRIV_DEBUG_UNPRIV:
3818 * Allow jail to set various resource limits and login
3819 * properties, and for now, exceed process resource limits.
3821 case PRIV_PROC_LIMIT:
3822 case PRIV_PROC_SETLOGIN:
3823 case PRIV_PROC_SETRLIMIT:
3826 * System V and POSIX IPC privileges are granted in jail.
3829 case PRIV_IPC_WRITE:
3830 case PRIV_IPC_ADMIN:
3831 case PRIV_IPC_MSGSIZE:
3835 * Jail operations within a jail work on child jails.
3837 case PRIV_JAIL_ATTACH:
3839 case PRIV_JAIL_REMOVE:
3842 * Jail implements its own inter-process limits, so allow
3843 * root processes in jail to change scheduling on other
3844 * processes in the same jail. Likewise for signalling.
3846 case PRIV_SCHED_DIFFCRED:
3847 case PRIV_SCHED_CPUSET:
3848 case PRIV_SIGNAL_DIFFCRED:
3849 case PRIV_SIGNAL_SUGID:
3852 * Allow jailed processes to write to sysctls marked as jail
3855 case PRIV_SYSCTL_WRITEJAIL:
3858 * Allow root in jail to manage a variety of quota
3859 * properties. These should likely be conditional on a
3860 * configuration option.
3862 case PRIV_VFS_GETQUOTA:
3863 case PRIV_VFS_SETQUOTA:
3866 * Since Jail relies on chroot() to implement file system
3867 * protections, grant many VFS privileges to root in jail.
3868 * Be careful to exclude mount-related and NFS-related
3872 case PRIV_VFS_WRITE:
3873 case PRIV_VFS_ADMIN:
3875 case PRIV_VFS_LOOKUP:
3876 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
3877 case PRIV_VFS_CHFLAGS_DEV:
3878 case PRIV_VFS_CHOWN:
3879 case PRIV_VFS_CHROOT:
3880 case PRIV_VFS_RETAINSUGID:
3881 case PRIV_VFS_FCHROOT:
3883 case PRIV_VFS_SETGID:
3885 case PRIV_VFS_STICKYFILE:
3889 * Depending on the global setting, allow privilege of
3890 * setting system flags.
3892 case PRIV_VFS_SYSFLAGS:
3893 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
3899 * Depending on the global setting, allow privilege of
3900 * mounting/unmounting file systems.
3902 case PRIV_VFS_MOUNT:
3903 case PRIV_VFS_UNMOUNT:
3904 case PRIV_VFS_MOUNT_NONUSER:
3905 case PRIV_VFS_MOUNT_OWNER:
3906 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT &&
3907 cred->cr_prison->pr_enforce_statfs < 2)
3913 * Allow jailed root to bind reserved ports and reuse in-use
3916 case PRIV_NETINET_RESERVEDPORT:
3917 case PRIV_NETINET_REUSEPORT:
3921 * Allow jailed root to set certian IPv4/6 (option) headers.
3923 case PRIV_NETINET_SETHDROPTS:
3927 * Conditionally allow creating raw sockets in jail.
3929 case PRIV_NETINET_RAW:
3930 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
3936 * Since jail implements its own visibility limits on netstat
3937 * sysctls, allow getcred. This allows identd to work in
3940 case PRIV_NETINET_GETCRED:
3944 * Allow jailed root to set loginclass.
3946 case PRIV_PROC_SETLOGINCLASS:
3951 * In all remaining cases, deny the privilege request. This
3952 * includes almost all network privileges, many system
3953 * configuration privileges.
3960 * Return the part of pr2's name that is relative to pr1, or the whole name
3961 * if it does not directly follow.
3965 prison_name(struct prison *pr1, struct prison *pr2)
3969 /* Jails see themselves as "0" (if they see themselves at all). */
3972 name = pr2->pr_name;
3973 if (prison_ischild(pr1, pr2)) {
3975 * pr1 isn't locked (and allprison_lock may not be either)
3976 * so its length can't be counted on. But the number of dots
3977 * can be counted on - and counted.
3979 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
3980 name = strchr(name, '.') + 1;
3986 * Return the part of pr2's path that is relative to pr1, or the whole path
3987 * if it does not directly follow.
3990 prison_path(struct prison *pr1, struct prison *pr2)
3992 char *path1, *path2;
3995 path1 = pr1->pr_path;
3996 path2 = pr2->pr_path;
3997 if (!strcmp(path1, "/"))
3999 len1 = strlen(path1);
4000 if (strncmp(path1, path2, len1))
4002 if (path2[len1] == '\0')
4004 if (path2[len1] == '/')
4005 return (path2 + len1);
4011 * Jail-related sysctls.
4013 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
4017 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
4020 struct prison *pr, *cpr;
4022 struct in_addr *ip4 = NULL;
4026 struct in6_addr *ip6 = NULL;
4031 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
4032 pr = req->td->td_ucred->cr_prison;
4034 sx_slock(&allprison_lock);
4035 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
4036 #if defined(INET) || defined(INET6)
4039 mtx_lock(&cpr->pr_mtx);
4041 if (cpr->pr_ip4s > 0) {
4042 if (ip4s < cpr->pr_ip4s) {
4043 ip4s = cpr->pr_ip4s;
4044 mtx_unlock(&cpr->pr_mtx);
4045 ip4 = realloc(ip4, ip4s *
4046 sizeof(struct in_addr), M_TEMP, M_WAITOK);
4049 bcopy(cpr->pr_ip4, ip4,
4050 cpr->pr_ip4s * sizeof(struct in_addr));
4054 if (cpr->pr_ip6s > 0) {
4055 if (ip6s < cpr->pr_ip6s) {
4056 ip6s = cpr->pr_ip6s;
4057 mtx_unlock(&cpr->pr_mtx);
4058 ip6 = realloc(ip6, ip6s *
4059 sizeof(struct in6_addr), M_TEMP, M_WAITOK);
4062 bcopy(cpr->pr_ip6, ip6,
4063 cpr->pr_ip6s * sizeof(struct in6_addr));
4066 if (cpr->pr_ref == 0) {
4067 mtx_unlock(&cpr->pr_mtx);
4070 bzero(xp, sizeof(*xp));
4071 xp->pr_version = XPRISON_VERSION;
4072 xp->pr_id = cpr->pr_id;
4073 xp->pr_state = cpr->pr_uref > 0
4074 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
4075 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
4076 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
4077 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
4079 xp->pr_ip4s = cpr->pr_ip4s;
4082 xp->pr_ip6s = cpr->pr_ip6s;
4084 mtx_unlock(&cpr->pr_mtx);
4085 error = SYSCTL_OUT(req, xp, sizeof(*xp));
4089 if (xp->pr_ip4s > 0) {
4090 error = SYSCTL_OUT(req, ip4,
4091 xp->pr_ip4s * sizeof(struct in_addr));
4097 if (xp->pr_ip6s > 0) {
4098 error = SYSCTL_OUT(req, ip6,
4099 xp->pr_ip6s * sizeof(struct in6_addr));
4105 sx_sunlock(&allprison_lock);
4116 SYSCTL_OID(_security_jail, OID_AUTO, list,
4117 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4118 sysctl_jail_list, "S", "List of active jails");
4121 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
4125 injail = jailed(req->td->td_ucred);
4126 error = SYSCTL_OUT(req, &injail, sizeof(injail));
4131 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
4132 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4133 sysctl_jail_jailed, "I", "Process in jail?");
4136 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
4138 int error, havevnet;
4140 struct ucred *cred = req->td->td_ucred;
4142 havevnet = jailed(cred) && prison_owns_vnet(cred);
4146 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
4151 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
4152 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4153 sysctl_jail_vnet, "I", "Jail owns VNET?");
4155 #if defined(INET) || defined(INET6)
4156 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
4157 &jail_max_af_ips, 0,
4158 "Number of IP addresses a jail may have at most per address family");
4162 * Default parameters for jail(2) compatability. For historical reasons,
4163 * the sysctl names have varying similarity to the parameter names. Prisons
4164 * just see their own parameters, and can't change them.
4167 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
4170 int allow, error, i;
4172 pr = req->td->td_ucred->cr_prison;
4173 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
4175 /* Get the current flag value, and convert it to a boolean. */
4176 i = (allow & arg2) ? 1 : 0;
4179 error = sysctl_handle_int(oidp, &i, 0, req);
4180 if (error || !req->newptr)
4186 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
4189 mtx_lock(&prison0.pr_mtx);
4190 jail_default_allow = (jail_default_allow & ~arg2) | i;
4191 mtx_unlock(&prison0.pr_mtx);
4195 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
4196 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4197 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
4198 "Processes in jail can set their hostnames");
4199 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
4200 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4201 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
4202 "Processes in jail are limited to creating UNIX/IP/route sockets only");
4203 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
4204 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4205 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
4206 "Processes in jail can use System V IPC primitives");
4207 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
4208 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4209 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
4210 "Prison root can create raw sockets");
4211 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
4212 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4213 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
4214 "Processes in jail can alter system file flags");
4215 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
4216 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4217 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
4218 "Processes in jail can mount/unmount jail-friendly file systems");
4219 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed,
4220 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4221 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I",
4222 "Processes in jail can mount the devfs file system");
4223 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed,
4224 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4225 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I",
4226 "Processes in jail can mount the nullfs file system");
4227 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed,
4228 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4229 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I",
4230 "Processes in jail can mount the procfs file system");
4231 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed,
4232 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4233 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I",
4234 "Processes in jail can mount the zfs file system");
4237 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
4242 pr = req->td->td_ucred->cr_prison;
4243 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
4244 error = sysctl_handle_int(oidp, &level, 0, req);
4245 if (error || !req->newptr)
4247 *(int *)arg1 = level;
4251 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
4252 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4253 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
4254 sysctl_jail_default_level, "I",
4255 "Processes in jail cannot see all mounted file systems");
4257 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
4258 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
4259 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
4260 sysctl_jail_default_level, "I",
4261 "Ruleset for the devfs filesystem in jail");
4264 * Nodes to describe jail parameters. Maximum length of string parameters
4265 * is returned in the string itself, and the other parameters exist merely
4266 * to make themselves and their types known.
4268 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0,
4272 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
4279 switch (oidp->oid_kind & CTLTYPE)
4285 if (!(req->flags & SCTL_MASK32))
4287 return (SYSCTL_OUT(req, &l, sizeof(l)));
4291 return (SYSCTL_OUT(req, &i, sizeof(i)));
4292 case CTLTYPE_STRING:
4293 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
4295 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
4296 case CTLTYPE_STRUCT:
4298 return (SYSCTL_OUT(req, &s, sizeof(s)));
4303 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
4304 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
4305 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
4306 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
4307 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
4308 "I", "Jail secure level");
4309 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
4310 "I", "Jail cannot see all mounted file systems");
4311 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
4312 "I", "Ruleset for in-jail devfs mounts");
4313 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
4314 "B", "Jail persistence");
4316 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
4317 "E,jailsys", "Virtual network stack");
4319 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
4320 "B", "Jail is in the process of shutting down");
4322 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
4323 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
4324 "I", "Current number of child jails");
4325 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
4326 "I", "Maximum number of child jails");
4328 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
4329 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
4331 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
4332 "Jail NIS domainname");
4333 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
4335 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
4336 "LU", "Jail host ID");
4338 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
4339 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
4342 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
4343 "Jail IPv4 address virtualization");
4344 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
4345 "S,in_addr,a", "Jail IPv4 addresses");
4346 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4347 "B", "Do (not) use IPv4 source address selection rather than the "
4348 "primary jail IPv4 address.");
4351 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
4352 "Jail IPv6 address virtualization");
4353 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
4354 "S,in6_addr,a", "Jail IPv6 addresses");
4355 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4356 "B", "Do (not) use IPv6 source address selection rather than the "
4357 "primary jail IPv6 address.");
4360 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
4361 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
4362 "B", "Jail may set hostname");
4363 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
4364 "B", "Jail may use SYSV IPC");
4365 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
4366 "B", "Jail may create raw sockets");
4367 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
4368 "B", "Jail may alter system file flags");
4369 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
4370 "B", "Jail may set file quotas");
4371 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
4372 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
4374 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
4375 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
4376 "B", "Jail may mount/unmount jail-friendly file systems in general");
4377 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW,
4378 "B", "Jail may mount the devfs file system");
4379 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW,
4380 "B", "Jail may mount the nullfs file system");
4381 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW,
4382 "B", "Jail may mount the procfs file system");
4383 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW,
4384 "B", "Jail may mount the zfs file system");
4387 prison_racct_foreach(void (*callback)(struct racct *racct,
4388 void *arg2, void *arg3), void *arg2, void *arg3)
4390 struct prison_racct *prr;
4392 sx_slock(&allprison_lock);
4393 LIST_FOREACH(prr, &allprison_racct, prr_next)
4394 (callback)(prr->prr_racct, arg2, arg3);
4395 sx_sunlock(&allprison_lock);
4398 static struct prison_racct *
4399 prison_racct_find_locked(const char *name)
4401 struct prison_racct *prr;
4403 sx_assert(&allprison_lock, SA_XLOCKED);
4405 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
4408 LIST_FOREACH(prr, &allprison_racct, prr_next) {
4409 if (strcmp(name, prr->prr_name) != 0)
4412 /* Found prison_racct with a matching name? */
4413 prison_racct_hold(prr);
4417 /* Add new prison_racct. */
4418 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
4419 racct_create(&prr->prr_racct);
4421 strcpy(prr->prr_name, name);
4422 refcount_init(&prr->prr_refcount, 1);
4423 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
4428 struct prison_racct *
4429 prison_racct_find(const char *name)
4431 struct prison_racct *prr;
4433 sx_xlock(&allprison_lock);
4434 prr = prison_racct_find_locked(name);
4435 sx_xunlock(&allprison_lock);
4440 prison_racct_hold(struct prison_racct *prr)
4443 refcount_acquire(&prr->prr_refcount);
4447 prison_racct_free_locked(struct prison_racct *prr)
4450 sx_assert(&allprison_lock, SA_XLOCKED);
4452 if (refcount_release(&prr->prr_refcount)) {
4453 racct_destroy(&prr->prr_racct);
4454 LIST_REMOVE(prr, prr_next);
4455 free(prr, M_PRISON_RACCT);
4460 prison_racct_free(struct prison_racct *prr)
4464 sx_assert(&allprison_lock, SA_UNLOCKED);
4466 old = prr->prr_refcount;
4467 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1))
4470 sx_xlock(&allprison_lock);
4471 prison_racct_free_locked(prr);
4472 sx_xunlock(&allprison_lock);
4477 prison_racct_attach(struct prison *pr)
4479 struct prison_racct *prr;
4481 sx_assert(&allprison_lock, SA_XLOCKED);
4483 prr = prison_racct_find_locked(pr->pr_name);
4484 KASSERT(prr != NULL, ("cannot find prison_racct"));
4486 pr->pr_prison_racct = prr;
4490 * Handle jail renaming. From the racct point of view, renaming means
4491 * moving from one prison_racct to another.
4494 prison_racct_modify(struct prison *pr)
4498 struct prison_racct *oldprr;
4500 sx_slock(&allproc_lock);
4501 sx_xlock(&allprison_lock);
4503 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
4504 sx_xunlock(&allprison_lock);
4505 sx_sunlock(&allproc_lock);
4509 oldprr = pr->pr_prison_racct;
4510 pr->pr_prison_racct = NULL;
4512 prison_racct_attach(pr);
4515 * Move resource utilisation records.
4517 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
4520 * Force rctl to reattach rules to processes.
4522 FOREACH_PROC_IN_SYSTEM(p) {
4524 cred = crhold(p->p_ucred);
4526 racct_proc_ucred_changed(p, cred, cred);
4530 sx_sunlock(&allproc_lock);
4531 prison_racct_free_locked(oldprr);
4532 sx_xunlock(&allprison_lock);
4536 prison_racct_detach(struct prison *pr)
4539 sx_assert(&allprison_lock, SA_UNLOCKED);
4541 if (pr->pr_prison_racct == NULL)
4543 prison_racct_free(pr->pr_prison_racct);
4544 pr->pr_prison_racct = NULL;
4551 db_show_prison(struct prison *pr)
4554 #if defined(INET) || defined(INET6)
4559 char ip6buf[INET6_ADDRSTRLEN];
4562 db_printf("prison %p:\n", pr);
4563 db_printf(" jid = %d\n", pr->pr_id);
4564 db_printf(" name = %s\n", pr->pr_name);
4565 db_printf(" parent = %p\n", pr->pr_parent);
4566 db_printf(" ref = %d\n", pr->pr_ref);
4567 db_printf(" uref = %d\n", pr->pr_uref);
4568 db_printf(" path = %s\n", pr->pr_path);
4569 db_printf(" cpuset = %d\n", pr->pr_cpuset
4570 ? pr->pr_cpuset->cs_id : -1);
4572 db_printf(" vnet = %p\n", pr->pr_vnet);
4574 db_printf(" root = %p\n", pr->pr_root);
4575 db_printf(" securelevel = %d\n", pr->pr_securelevel);
4576 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
4577 db_printf(" children.max = %d\n", pr->pr_childmax);
4578 db_printf(" children.cur = %d\n", pr->pr_childcount);
4579 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
4580 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
4581 db_printf(" flags = 0x%x", pr->pr_flags);
4582 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
4584 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi)))
4585 db_printf(" %s", pr_flag_names[fi]);
4586 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
4588 jsf = pr->pr_flags &
4589 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
4590 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name,
4591 pr_flag_jailsys[fi].disable &&
4592 (jsf == pr_flag_jailsys[fi].disable) ? "disable"
4593 : (jsf == pr_flag_jailsys[fi].new) ? "new"
4596 db_printf(" allow = 0x%x", pr->pr_allow);
4597 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
4599 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi)))
4600 db_printf(" %s", pr_allow_names[fi]);
4602 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
4603 db_printf(" host.hostname = %s\n", pr->pr_hostname);
4604 db_printf(" host.domainname = %s\n", pr->pr_domainname);
4605 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
4606 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
4608 db_printf(" ip4s = %d\n", pr->pr_ip4s);
4609 for (ii = 0; ii < pr->pr_ip4s; ii++)
4610 db_printf(" %s %s\n",
4611 ii == 0 ? "ip4.addr =" : " ",
4612 inet_ntoa(pr->pr_ip4[ii]));
4615 db_printf(" ip6s = %d\n", pr->pr_ip6s);
4616 for (ii = 0; ii < pr->pr_ip6s; ii++)
4617 db_printf(" %s %s\n",
4618 ii == 0 ? "ip6.addr =" : " ",
4619 ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
4623 DB_SHOW_COMMAND(prison, db_show_prison_command)
4629 * Show all prisons in the list, and prison0 which is not
4632 db_show_prison(&prison0);
4633 if (!db_pager_quit) {
4634 TAILQ_FOREACH(pr, &allprison, pr_list) {
4646 /* Look for a prison with the ID and with references. */
4647 TAILQ_FOREACH(pr, &allprison, pr_list)
4648 if (pr->pr_id == addr && pr->pr_ref > 0)
4651 /* Look again, without requiring a reference. */
4652 TAILQ_FOREACH(pr, &allprison, pr_list)
4653 if (pr->pr_id == addr)
4656 /* Assume address points to a valid prison. */
4657 pr = (struct prison *)addr;