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",
211 const size_t pr_allow_names_size = sizeof(pr_allow_names);
213 static char *pr_allow_nonames[] = {
214 "allow.noset_hostname",
216 "allow.noraw_sockets",
221 "allow.mount.nodevfs",
222 "allow.mount.nonullfs",
224 "allow.mount.noprocfs",
225 "allow.mount.notmpfs",
227 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames);
229 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME
230 #define JAIL_DEFAULT_ENFORCE_STATFS 2
231 #define JAIL_DEFAULT_DEVFS_RSNUM 0
232 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
233 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
234 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
235 #if defined(INET) || defined(INET6)
236 static unsigned jail_max_af_ips = 255;
241 qcmp_v4(const void *ip1, const void *ip2)
246 * We need to compare in HBO here to get the list sorted as expected
247 * by the result of the code. Sorting NBO addresses gives you
248 * interesting results. If you do not understand, do not try.
250 iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
251 iab = ntohl(((const struct in_addr *)ip2)->s_addr);
254 * Do not simply return the difference of the two numbers, the int is
268 qcmp_v6(const void *ip1, const void *ip2)
270 const struct in6_addr *ia6a, *ia6b;
273 ia6a = (const struct in6_addr *)ip1;
274 ia6b = (const struct in6_addr *)ip2;
277 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
278 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
280 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
293 sys_jail(struct thread *td, struct jail_args *uap)
299 error = copyin(uap->jail, &version, sizeof(uint32_t));
308 /* FreeBSD single IPv4 jails. */
309 bzero(&j, sizeof(struct jail));
310 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
313 j.version = j0.version;
315 j.hostname = j0.hostname;
316 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */
322 * Version 1 was used by multi-IPv4 jail implementations
323 * that never made it into the official kernel.
327 case 2: /* JAIL_API_VERSION */
328 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
329 error = copyin(uap->jail, &j, sizeof(struct jail));
335 /* Sci-Fi jails are not supported, sorry. */
338 return (kern_jail(td, &j));
342 kern_jail(struct thread *td, struct jail *j)
344 struct iovec optiov[2 * (4
345 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0])
354 char *u_path, *u_hostname, *u_name;
357 struct in_addr *u_ip4;
360 struct in6_addr *u_ip6;
363 int error, enforce_statfs, fi;
365 bzero(&optiov, sizeof(optiov));
366 opt.uio_iov = optiov;
370 opt.uio_segflg = UIO_SYSSPACE;
371 opt.uio_rw = UIO_READ;
374 /* Set permissions for top-level jails from sysctls. */
375 if (!jailed(td->td_ucred)) {
376 for (fi = 0; fi < sizeof(pr_allow_names) /
377 sizeof(pr_allow_names[0]); fi++) {
378 optiov[opt.uio_iovcnt].iov_base =
379 (jail_default_allow & (1 << fi))
380 ? pr_allow_names[fi] : pr_allow_nonames[fi];
381 optiov[opt.uio_iovcnt].iov_len =
382 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
385 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
386 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
388 enforce_statfs = jail_default_enforce_statfs;
389 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
390 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
394 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
396 ip4s = (j->version == 0) ? 1 : j->ip4s;
397 if (ip4s > jail_max_af_ips)
399 tmplen += ip4s * sizeof(struct in_addr);
405 if (j->ip6s > jail_max_af_ips)
407 tmplen += j->ip6s * sizeof(struct in6_addr);
412 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
413 u_hostname = u_path + MAXPATHLEN;
414 u_name = u_hostname + MAXHOSTNAMELEN;
416 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
420 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
422 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
425 optiov[opt.uio_iovcnt].iov_base = "path";
426 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
428 optiov[opt.uio_iovcnt].iov_base = u_path;
429 error = copyinstr(j->path, u_path, MAXPATHLEN,
430 &optiov[opt.uio_iovcnt].iov_len);
432 free(u_path, M_TEMP);
436 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
437 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
439 optiov[opt.uio_iovcnt].iov_base = u_hostname;
440 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
441 &optiov[opt.uio_iovcnt].iov_len);
443 free(u_path, M_TEMP);
447 if (j->jailname != NULL) {
448 optiov[opt.uio_iovcnt].iov_base = "name";
449 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
451 optiov[opt.uio_iovcnt].iov_base = u_name;
452 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
453 &optiov[opt.uio_iovcnt].iov_len);
455 free(u_path, M_TEMP);
461 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
462 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
464 optiov[opt.uio_iovcnt].iov_base = u_ip4;
465 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
467 u_ip4->s_addr = j->ip4s;
469 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
471 free(u_path, M_TEMP);
478 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
479 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
481 optiov[opt.uio_iovcnt].iov_base = u_ip6;
482 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
483 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
485 free(u_path, M_TEMP);
490 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]),
491 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
492 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
493 free(u_path, M_TEMP);
499 * struct jail_set_args {
500 * struct iovec *iovp;
501 * unsigned int iovcnt;
506 sys_jail_set(struct thread *td, struct jail_set_args *uap)
511 /* Check that we have an even number of iovecs. */
515 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
518 error = kern_jail_set(td, auio, uap->flags);
524 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
531 struct in6_addr *ip6;
534 struct vfsoptlist *opts;
535 struct prison *pr, *deadpr, *mypr, *ppr, *tpr;
537 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
539 #if defined(INET) || defined(INET6)
544 size_t namelen, onamelen;
545 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos;
546 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
547 int fi, jid, jsys, len, level;
548 int childmax, rsnum, slevel;
549 int fullpath_disabled;
550 #if defined(INET) || defined(INET6)
559 uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
563 error = priv_check(td, PRIV_JAIL_SET);
564 if (!error && (flags & JAIL_ATTACH))
565 error = priv_check(td, PRIV_JAIL_ATTACH);
568 mypr = ppr = td->td_ucred->cr_prison;
569 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
571 if (flags & ~JAIL_SET_MASK)
575 * Check all the parameters before committing to anything. Not all
576 * errors can be caught early, but we may as well try. Also, this
577 * takes care of some expensive stuff (path lookup) before getting
578 * the allprison lock.
580 * XXX Jails are not filesystems, and jail parameters are not mount
581 * options. But it makes more sense to re-use the vfsopt code
582 * than duplicate it under a different name.
584 error = vfs_buildopts(optuio, &opts);
595 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
601 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
610 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
618 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
623 else if (enforce < 0 || enforce > 2) {
629 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
637 pr_flags = ch_flags = 0;
638 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
640 if (pr_flag_names[fi] == NULL)
642 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi);
643 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi);
645 ch_flags |= pr_flags;
646 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
648 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys,
655 case JAIL_SYS_DISABLE:
656 if (!pr_flag_jailsys[fi].disable) {
660 pr_flags |= pr_flag_jailsys[fi].disable;
663 pr_flags |= pr_flag_jailsys[fi].new;
665 case JAIL_SYS_INHERIT:
672 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable;
674 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE
675 && !(pr_flags & PR_PERSIST)) {
677 vfs_opterror(opts, "new jail must persist or attach");
681 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
683 vfs_opterror(opts, "vnet cannot be changed after creation");
688 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
690 vfs_opterror(opts, "ip4 cannot be changed after creation");
695 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
697 vfs_opterror(opts, "ip6 cannot be changed after creation");
702 pr_allow = ch_allow = 0;
703 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
705 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi);
706 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi);
708 ch_allow |= pr_allow;
710 error = vfs_getopt(opts, "name", (void **)&name, &len);
716 if (len == 0 || name[len - 1] != '\0') {
720 if (len > MAXHOSTNAMELEN) {
721 error = ENAMETOOLONG;
726 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
734 if (len == 0 || host[len - 1] != '\0') {
738 if (len > MAXHOSTNAMELEN) {
739 error = ENAMETOOLONG;
744 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
752 if (len == 0 || domain[len - 1] != '\0') {
756 if (len > MAXHOSTNAMELEN) {
757 error = ENAMETOOLONG;
762 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
770 if (len == 0 || uuid[len - 1] != '\0') {
774 if (len > HOSTUUIDLEN) {
775 error = ENAMETOOLONG;
780 #ifdef COMPAT_FREEBSD32
781 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
784 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
788 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
800 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
802 ip4s = (pr_flags & PR_IP4_DISABLE) ? 0 : -1;
805 else if (ip4s & (sizeof(*ip4) - 1)) {
809 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE;
811 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE;
813 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER;
814 ip4s /= sizeof(*ip4);
815 if (ip4s > jail_max_af_ips) {
817 vfs_opterror(opts, "too many IPv4 addresses");
820 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
821 bcopy(op, ip4, ip4s * sizeof(*ip4));
823 * IP addresses are all sorted but ip[0] to preserve
824 * the primary IP address as given from userland.
825 * This special IP is used for unbound outgoing
826 * connections as well for "loopback" traffic in case
827 * source address selection cannot find any more fitting
828 * address to connect from.
831 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4);
833 * Check for duplicate addresses and do some simple
834 * zero and broadcast checks. If users give other bogus
835 * addresses it is their problem.
837 * We do not have to care about byte order for these
838 * checks so we will do them in NBO.
840 for (ii = 0; ii < ip4s; ii++) {
841 if (ip4[ii].s_addr == INADDR_ANY ||
842 ip4[ii].s_addr == INADDR_BROADCAST) {
847 (ip4[0].s_addr == ip4[ii+1].s_addr ||
848 ip4[ii].s_addr == ip4[ii+1].s_addr)) {
858 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
860 ip6s = (pr_flags & PR_IP6_DISABLE) ? 0 : -1;
863 else if (ip6s & (sizeof(*ip6) - 1)) {
867 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE;
869 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE;
871 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER;
872 ip6s /= sizeof(*ip6);
873 if (ip6s > jail_max_af_ips) {
875 vfs_opterror(opts, "too many IPv6 addresses");
878 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
879 bcopy(op, ip6, ip6s * sizeof(*ip6));
881 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6);
882 for (ii = 0; ii < ip6s; ii++) {
883 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
888 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
889 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
899 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
900 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
903 "vnet jails cannot have IP address restrictions");
908 fullpath_disabled = 0;
910 error = vfs_getopt(opts, "path", (void **)&path, &len);
916 if (flags & JAIL_UPDATE) {
919 "path cannot be changed after creation");
922 if (len == 0 || path[len - 1] != '\0') {
926 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
932 NDFREE(&nd, NDF_ONLY_PNBUF);
933 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
934 strlcpy(g_path, path, MAXPATHLEN);
935 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
938 else if (error == ENODEV) {
939 /* proceed if sysctl debug.disablefullpath == 1 */
940 fullpath_disabled = 1;
941 if (len < 2 || (len == 2 && path[0] == '/'))
944 /* exit on other errors */
947 if (root->v_type != VDIR) {
953 if (fullpath_disabled) {
954 /* Leave room for a real-root full pathname. */
955 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/")
956 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) {
957 error = ENAMETOOLONG;
964 * Grab the allprison lock before letting modules check their
965 * parameters. Once we have it, do not let go so we'll have a
966 * consistent view of the OSD list.
968 sx_xlock(&allprison_lock);
969 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts);
971 goto done_unlock_list;
973 /* By now, all parameters should have been noted. */
974 TAILQ_FOREACH(opt, opts, link) {
975 if (!opt->seen && strcmp(opt->name, "errmsg")) {
977 vfs_opterror(opts, "unknown parameter: %s", opt->name);
978 goto done_unlock_list;
983 * See if we are creating a new record or updating an existing one.
984 * This abuses the file error codes ENOENT and EEXIST.
986 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
989 vfs_opterror(opts, "no valid operation (create or update)");
990 goto done_unlock_list;
994 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
995 namelc = strrchr(name, '.');
996 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
1002 * See if a requested jid already exists. There is an
1003 * information leak here if the jid exists but is not within
1004 * the caller's jail hierarchy. Jail creators will get EEXIST
1005 * even though they cannot see the jail, and CREATE | UPDATE
1006 * will return ENOENT which is not normally a valid error.
1010 vfs_opterror(opts, "negative jid");
1011 goto done_unlock_list;
1013 pr = prison_find(jid);
1015 ppr = pr->pr_parent;
1016 /* Create: jid must not exist. */
1017 if (cuflags == JAIL_CREATE) {
1018 mtx_unlock(&pr->pr_mtx);
1020 vfs_opterror(opts, "jail %d already exists",
1022 goto done_unlock_list;
1024 if (!prison_ischild(mypr, pr)) {
1025 mtx_unlock(&pr->pr_mtx);
1027 } else if (pr->pr_uref == 0) {
1028 if (!(flags & JAIL_DYING)) {
1029 mtx_unlock(&pr->pr_mtx);
1031 vfs_opterror(opts, "jail %d is dying",
1033 goto done_unlock_list;
1034 } else if ((flags & JAIL_ATTACH) ||
1035 (pr_flags & PR_PERSIST)) {
1037 * A dying jail might be resurrected
1038 * (via attach or persist), but first
1039 * it must determine if another jail
1040 * has claimed its name. Accomplish
1041 * this by implicitly re-setting the
1045 name = prison_name(mypr, pr);
1050 /* Update: jid must exist. */
1051 if (cuflags == JAIL_UPDATE) {
1053 vfs_opterror(opts, "jail %d not found", jid);
1054 goto done_unlock_list;
1059 * If the caller provided a name, look for a jail by that name.
1060 * This has different semantics for creates and updates keyed by jid
1061 * (where the name must not already exist in a different jail),
1062 * and updates keyed by the name itself (where the name must exist
1063 * because that is the jail being updated).
1066 namelc = strrchr(name, '.');
1071 * This is a hierarchical name. Split it into the
1072 * parent and child names, and make sure the parent
1073 * exists or matches an already found jail.
1077 if (strncmp(name, ppr->pr_name, namelc - name)
1078 || ppr->pr_name[namelc - name] != '\0') {
1079 mtx_unlock(&pr->pr_mtx);
1082 "cannot change jail's parent");
1083 goto done_unlock_list;
1086 ppr = prison_find_name(mypr, name);
1090 "jail \"%s\" not found", name);
1091 goto done_unlock_list;
1093 mtx_unlock(&ppr->pr_mtx);
1097 if (name[0] != '\0') {
1099 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1102 FOREACH_PRISON_CHILD(ppr, tpr) {
1103 if (tpr != pr && tpr->pr_ref > 0 &&
1104 !strcmp(tpr->pr_name + namelen, name)) {
1106 cuflags != JAIL_CREATE) {
1107 mtx_lock(&tpr->pr_mtx);
1108 if (tpr->pr_ref > 0) {
1113 if (tpr->pr_uref > 0) {
1119 mtx_unlock(&tpr->pr_mtx);
1120 } else if (tpr->pr_uref > 0) {
1122 * Create, or update(jid):
1123 * name must not exist in an
1124 * active sibling jail.
1128 mtx_unlock(&pr->pr_mtx);
1130 "jail \"%s\" already exists",
1132 goto done_unlock_list;
1136 /* If no active jail is found, use a dying one. */
1137 if (deadpr != NULL && pr == NULL) {
1138 if (flags & JAIL_DYING) {
1139 mtx_lock(&deadpr->pr_mtx);
1140 if (deadpr->pr_ref == 0) {
1141 mtx_unlock(&deadpr->pr_mtx);
1145 } else if (cuflags == JAIL_UPDATE) {
1148 "jail \"%s\" is dying", name);
1149 goto done_unlock_list;
1152 /* Update: name must exist if no jid. */
1153 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1155 vfs_opterror(opts, "jail \"%s\" not found",
1157 goto done_unlock_list;
1161 /* Update: must provide a jid or name. */
1162 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1164 vfs_opterror(opts, "update specified no jail");
1165 goto done_unlock_list;
1168 /* If there's no prison to update, create a new one and link it in. */
1170 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1171 if (tpr->pr_childcount >= tpr->pr_childmax) {
1173 vfs_opterror(opts, "prison limit exceeded");
1174 goto done_unlock_list;
1177 mtx_lock(&ppr->pr_mtx);
1178 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) {
1179 mtx_unlock(&ppr->pr_mtx);
1181 vfs_opterror(opts, "parent jail went away!");
1182 goto done_unlock_list;
1186 mtx_unlock(&ppr->pr_mtx);
1187 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1189 /* Find the next free jid. */
1192 if (jid == JAIL_MAX)
1194 TAILQ_FOREACH(tpr, &allprison, pr_list) {
1195 if (tpr->pr_id < jid)
1197 if (tpr->pr_id > jid || tpr->pr_ref == 0) {
1198 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1201 if (jid == lastprid) {
1204 "no available jail IDs");
1206 prison_deref(ppr, PD_DEREF |
1207 PD_DEUREF | PD_LIST_XLOCKED);
1216 * The jail already has a jid (that did not yet exist),
1217 * so just find where to insert it.
1219 TAILQ_FOREACH(tpr, &allprison, pr_list)
1220 if (tpr->pr_id >= jid) {
1221 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1226 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1227 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1228 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1229 tpr->pr_childcount++;
1231 pr->pr_parent = ppr;
1234 /* Set some default values, and inherit some from the parent. */
1239 root = mypr->pr_root;
1242 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1243 pr->pr_flags |= PR_HOST;
1244 #if defined(INET) || defined(INET6)
1246 if (!(pr_flags & PR_VNET))
1250 if (!(ch_flags & PR_IP4_USER))
1252 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE;
1253 else if (!(pr_flags & PR_IP4_USER)) {
1254 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1255 if (ppr->pr_ip4 != NULL) {
1256 pr->pr_ip4s = ppr->pr_ip4s;
1257 pr->pr_ip4 = malloc(pr->pr_ip4s *
1258 sizeof(struct in_addr), M_PRISON,
1260 bcopy(ppr->pr_ip4, pr->pr_ip4,
1261 pr->pr_ip4s * sizeof(*pr->pr_ip4));
1266 if (!(ch_flags & PR_IP6_USER))
1268 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE;
1269 else if (!(pr_flags & PR_IP6_USER)) {
1270 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1271 if (ppr->pr_ip6 != NULL) {
1272 pr->pr_ip6s = ppr->pr_ip6s;
1273 pr->pr_ip6 = malloc(pr->pr_ip6s *
1274 sizeof(struct in6_addr), M_PRISON,
1276 bcopy(ppr->pr_ip6, pr->pr_ip6,
1277 pr->pr_ip6s * sizeof(*pr->pr_ip6));
1283 /* Source address selection is always on by default. */
1284 pr->pr_flags |= _PR_IP_SADDRSEL;
1286 pr->pr_securelevel = ppr->pr_securelevel;
1287 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1288 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
1289 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
1291 LIST_INIT(&pr->pr_children);
1292 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1295 /* Allocate a new vnet if specified. */
1296 pr->pr_vnet = (pr_flags & PR_VNET)
1297 ? vnet_alloc() : ppr->pr_vnet;
1300 * Allocate a dedicated cpuset for each jail.
1301 * Unlike other initial settings, this may return an erorr.
1303 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1305 prison_deref(pr, PD_LIST_XLOCKED);
1309 mtx_lock(&pr->pr_mtx);
1311 * New prisons do not yet have a reference, because we do not
1312 * want other to see the incomplete prison once the
1313 * allprison_lock is downgraded.
1318 * Grab a reference for existing prisons, to ensure they
1319 * continue to exist for the duration of the call.
1322 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1323 if ((pr->pr_flags & PR_VNET) &&
1324 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1327 "vnet jails cannot have IP address restrictions");
1328 goto done_deref_locked;
1332 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1335 "ip4 cannot be changed after creation");
1336 goto done_deref_locked;
1340 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1343 "ip6 cannot be changed after creation");
1344 goto done_deref_locked;
1349 /* Do final error checking before setting anything. */
1351 if (slevel < ppr->pr_securelevel) {
1353 goto done_deref_locked;
1357 if (childmax >= ppr->pr_childmax) {
1359 goto done_deref_locked;
1363 if (enforce < ppr->pr_enforce_statfs) {
1365 goto done_deref_locked;
1370 * devfs_rsnum is a uint16_t
1372 if (rsnum < 0 || rsnum > 65535) {
1374 goto done_deref_locked;
1377 * Nested jails always inherit parent's devfs ruleset
1379 if (jailed(td->td_ucred)) {
1380 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
1382 goto done_deref_locked;
1384 rsnum = ppr->pr_devfs_rsnum;
1389 if (ppr->pr_flags & PR_IP4) {
1391 * Make sure the new set of IP addresses is a
1392 * subset of the parent's list. Don't worry
1393 * about the parent being unlocked, as any
1394 * setting is done with allprison_lock held.
1396 for (ij = 0; ij < ppr->pr_ip4s; ij++)
1397 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
1399 if (ij == ppr->pr_ip4s) {
1401 goto done_deref_locked;
1404 for (ii = ij = 1; ii < ip4s; ii++) {
1405 if (ip4[ii].s_addr ==
1406 ppr->pr_ip4[0].s_addr)
1408 for (; ij < ppr->pr_ip4s; ij++)
1409 if (ip4[ii].s_addr ==
1410 ppr->pr_ip4[ij].s_addr)
1412 if (ij == ppr->pr_ip4s)
1415 if (ij == ppr->pr_ip4s) {
1417 goto done_deref_locked;
1422 * Check for conflicting IP addresses. We permit them
1423 * if there is no more than one IP on each jail. If
1424 * there is a duplicate on a jail with more than one
1425 * IP stop checking and return error.
1429 for (; tppr != &prison0; tppr = tppr->pr_parent)
1430 if (tppr->pr_flags & PR_VNET)
1433 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1436 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1438 tpr->pr_uref == 0) {
1442 if (!(tpr->pr_flags & PR_IP4_USER))
1445 if (tpr->pr_ip4 == NULL ||
1446 (ip4s == 1 && tpr->pr_ip4s == 1))
1448 for (ii = 0; ii < ip4s; ii++) {
1449 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) {
1452 "IPv4 addresses clash");
1453 goto done_deref_locked;
1461 if (ppr->pr_flags & PR_IP6) {
1463 * Make sure the new set of IP addresses is a
1464 * subset of the parent's list.
1466 for (ij = 0; ij < ppr->pr_ip6s; ij++)
1467 if (IN6_ARE_ADDR_EQUAL(&ip6[0],
1470 if (ij == ppr->pr_ip6s) {
1472 goto done_deref_locked;
1475 for (ii = ij = 1; ii < ip6s; ii++) {
1476 if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
1479 for (; ij < ppr->pr_ip6s; ij++)
1480 if (IN6_ARE_ADDR_EQUAL(
1481 &ip6[ii], &ppr->pr_ip6[ij]))
1483 if (ij == ppr->pr_ip6s)
1486 if (ij == ppr->pr_ip6s) {
1488 goto done_deref_locked;
1492 /* Check for conflicting IP addresses. */
1495 for (; tppr != &prison0; tppr = tppr->pr_parent)
1496 if (tppr->pr_flags & PR_VNET)
1499 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1502 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1504 tpr->pr_uref == 0) {
1508 if (!(tpr->pr_flags & PR_IP6_USER))
1511 if (tpr->pr_ip6 == NULL ||
1512 (ip6s == 1 && tpr->pr_ip6s == 1))
1514 for (ii = 0; ii < ip6s; ii++) {
1515 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) {
1518 "IPv6 addresses clash");
1519 goto done_deref_locked;
1525 onamelen = namelen = 0;
1527 /* Give a default name of the jid. */
1528 if (name[0] == '\0')
1529 snprintf(name = numbuf, sizeof(numbuf), "%d", jid);
1530 else if (*namelc == '0' || (strtoul(namelc, &p, 10) != jid &&
1534 "name cannot be numeric (unless it is the jid)");
1535 goto done_deref_locked;
1538 * Make sure the name isn't too long for the prison or its
1541 onamelen = strlen(pr->pr_name);
1542 namelen = strlen(name);
1543 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) {
1544 error = ENAMETOOLONG;
1545 goto done_deref_locked;
1547 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1548 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
1549 sizeof(pr->pr_name)) {
1550 error = ENAMETOOLONG;
1551 goto done_deref_locked;
1555 if (pr_allow & ~ppr->pr_allow) {
1557 goto done_deref_locked;
1560 /* Set the parameters of the prison. */
1563 if (pr_flags & PR_IP4_USER) {
1564 pr->pr_flags |= PR_IP4;
1565 free(pr->pr_ip4, M_PRISON);
1569 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1571 if (tpr->pr_flags & PR_VNET) {
1576 if (prison_restrict_ip4(tpr, NULL)) {
1585 if (pr_flags & PR_IP6_USER) {
1586 pr->pr_flags |= PR_IP6;
1587 free(pr->pr_ip6, M_PRISON);
1591 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1593 if (tpr->pr_flags & PR_VNET) {
1598 if (prison_restrict_ip6(tpr, NULL)) {
1606 pr->pr_securelevel = slevel;
1607 /* Set all child jails to be at least this level. */
1608 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1609 if (tpr->pr_securelevel < slevel)
1610 tpr->pr_securelevel = slevel;
1613 pr->pr_childmax = childmax;
1614 /* Set all child jails to under this limit. */
1615 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
1616 if (tpr->pr_childmax > childmax - level)
1617 tpr->pr_childmax = childmax > level
1618 ? childmax - level : 0;
1621 pr->pr_enforce_statfs = enforce;
1622 /* Pass this restriction on to the children. */
1623 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1624 if (tpr->pr_enforce_statfs < enforce)
1625 tpr->pr_enforce_statfs = enforce;
1628 pr->pr_devfs_rsnum = rsnum;
1629 /* Pass this restriction on to the children. */
1630 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1631 tpr->pr_devfs_rsnum = rsnum;
1634 if (ppr == &prison0)
1635 strlcpy(pr->pr_name, name, sizeof(pr->pr_name));
1637 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
1638 ppr->pr_name, name);
1639 /* Change this component of child names. */
1640 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1641 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
1642 strlen(tpr->pr_name + onamelen) + 1);
1643 bcopy(pr->pr_name, tpr->pr_name, namelen);
1647 /* Try to keep a real-rooted full pathname. */
1648 if (fullpath_disabled && path[0] == '/' &&
1649 strcmp(mypr->pr_path, "/"))
1650 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s",
1651 mypr->pr_path, path);
1653 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
1656 if (PR_HOST & ch_flags & ~pr_flags) {
1657 if (pr->pr_flags & PR_HOST) {
1659 * Copy the parent's host info. As with pr_ip4 above,
1660 * the lack of a lock on the parent is not a problem;
1661 * it is always set with allprison_lock at least
1662 * shared, and is held exclusively here.
1664 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
1665 sizeof(pr->pr_hostname));
1666 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
1667 sizeof(pr->pr_domainname));
1668 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
1669 sizeof(pr->pr_hostuuid));
1670 pr->pr_hostid = pr->pr_parent->pr_hostid;
1672 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
1673 /* Set this prison, and any descendants without PR_HOST. */
1675 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
1677 strlcpy(pr->pr_domainname, domain,
1678 sizeof(pr->pr_domainname));
1680 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
1682 pr->pr_hostid = hid;
1683 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1684 if (tpr->pr_flags & PR_HOST)
1688 strlcpy(tpr->pr_hostname,
1690 sizeof(tpr->pr_hostname));
1692 strlcpy(tpr->pr_domainname,
1694 sizeof(tpr->pr_domainname));
1696 strlcpy(tpr->pr_hostuuid,
1698 sizeof(tpr->pr_hostuuid));
1700 tpr->pr_hostid = hid;
1704 if ((tallow = ch_allow & ~pr_allow)) {
1705 /* Clear allow bits in all children. */
1706 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1707 tpr->pr_allow &= ~tallow;
1709 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
1711 * Persistent prisons get an extra reference, and prisons losing their
1712 * persist flag lose that reference. Only do this for existing prisons
1713 * for now, so new ones will remain unseen until after the module
1714 * handlers have completed.
1716 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) {
1717 if (pr_flags & PR_PERSIST) {
1725 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
1726 mtx_unlock(&pr->pr_mtx);
1730 prison_racct_attach(pr);
1733 /* Locks may have prevented a complete restriction of child IP
1734 * addresses. If so, allocate some more memory and try again.
1739 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
1740 mtx_lock(&pr->pr_mtx);
1742 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1744 if (tpr->pr_flags & PR_VNET) {
1749 if (prison_restrict_ip4(tpr, ip4)) {
1756 mtx_unlock(&pr->pr_mtx);
1762 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
1763 mtx_lock(&pr->pr_mtx);
1765 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1767 if (tpr->pr_flags & PR_VNET) {
1772 if (prison_restrict_ip6(tpr, ip6)) {
1779 mtx_unlock(&pr->pr_mtx);
1783 /* Let the modules do their work. */
1784 sx_downgrade(&allprison_lock);
1786 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
1788 prison_deref(pr, PD_LIST_SLOCKED);
1792 error = osd_jail_call(pr, PR_METHOD_SET, opts);
1794 prison_deref(pr, created
1796 : PD_DEREF | PD_LIST_SLOCKED);
1800 /* Attach this process to the prison if requested. */
1801 if (flags & JAIL_ATTACH) {
1802 mtx_lock(&pr->pr_mtx);
1803 error = do_jail_attach(td, pr);
1805 vfs_opterror(opts, "attach failed");
1807 prison_deref(pr, PD_DEREF);
1814 if (!(flags & JAIL_ATTACH))
1815 sx_sunlock(&allprison_lock);
1816 prison_racct_modify(pr);
1817 if (!(flags & JAIL_ATTACH))
1818 sx_slock(&allprison_lock);
1822 td->td_retval[0] = pr->pr_id;
1825 * Now that it is all there, drop the temporary reference from existing
1826 * prisons. Or add a reference to newly created persistent prisons
1827 * (which was not done earlier so that the prison would not be publicly
1831 prison_deref(pr, (flags & JAIL_ATTACH)
1833 : PD_DEREF | PD_LIST_SLOCKED);
1835 if (pr_flags & PR_PERSIST) {
1836 mtx_lock(&pr->pr_mtx);
1839 mtx_unlock(&pr->pr_mtx);
1841 if (!(flags & JAIL_ATTACH))
1842 sx_sunlock(&allprison_lock);
1848 prison_deref(pr, created
1849 ? PD_LOCKED | PD_LIST_XLOCKED
1850 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
1853 sx_xunlock(&allprison_lock);
1859 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
1860 if (errmsg_len > 0) {
1861 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
1862 if (errmsg_pos > 0) {
1863 if (optuio->uio_segflg == UIO_SYSSPACE)
1865 optuio->uio_iov[errmsg_pos].iov_base,
1869 optuio->uio_iov[errmsg_pos].iov_base,
1876 free(ip4, M_PRISON);
1879 free(ip6, M_PRISON);
1882 free(g_path, M_TEMP);
1889 * struct jail_get_args {
1890 * struct iovec *iovp;
1891 * unsigned int iovcnt;
1896 sys_jail_get(struct thread *td, struct jail_get_args *uap)
1901 /* Check that we have an even number of iovecs. */
1902 if (uap->iovcnt & 1)
1905 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
1908 error = kern_jail_get(td, auio, uap->flags);
1910 error = copyout(auio->uio_iov, uap->iovp,
1911 uap->iovcnt * sizeof (struct iovec));
1917 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
1919 struct prison *pr, *mypr;
1921 struct vfsoptlist *opts;
1922 char *errmsg, *name;
1923 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos;
1925 if (flags & ~JAIL_GET_MASK)
1928 /* Get the parameter list. */
1929 error = vfs_buildopts(optuio, &opts);
1932 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
1933 mypr = td->td_ucred->cr_prison;
1936 * Find the prison specified by one of: lastjid, jid, name.
1938 sx_slock(&allprison_lock);
1939 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
1941 TAILQ_FOREACH(pr, &allprison, pr_list) {
1942 if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
1943 mtx_lock(&pr->pr_mtx);
1944 if (pr->pr_ref > 0 &&
1945 (pr->pr_uref > 0 || (flags & JAIL_DYING)))
1947 mtx_unlock(&pr->pr_mtx);
1953 vfs_opterror(opts, "no jail after %d", jid);
1954 goto done_unlock_list;
1955 } else if (error != ENOENT)
1956 goto done_unlock_list;
1958 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
1961 pr = prison_find_child(mypr, jid);
1963 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1964 mtx_unlock(&pr->pr_mtx);
1966 vfs_opterror(opts, "jail %d is dying",
1968 goto done_unlock_list;
1973 vfs_opterror(opts, "jail %d not found", jid);
1974 goto done_unlock_list;
1976 } else if (error != ENOENT)
1977 goto done_unlock_list;
1979 error = vfs_getopt(opts, "name", (void **)&name, &len);
1981 if (len == 0 || name[len - 1] != '\0') {
1983 goto done_unlock_list;
1985 pr = prison_find_name(mypr, name);
1987 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1988 mtx_unlock(&pr->pr_mtx);
1990 vfs_opterror(opts, "jail \"%s\" is dying",
1992 goto done_unlock_list;
1997 vfs_opterror(opts, "jail \"%s\" not found", name);
1998 goto done_unlock_list;
1999 } else if (error != ENOENT)
2000 goto done_unlock_list;
2002 vfs_opterror(opts, "no jail specified");
2004 goto done_unlock_list;
2007 /* Get the parameters of the prison. */
2010 td->td_retval[0] = pr->pr_id;
2011 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
2012 if (error != 0 && error != ENOENT)
2014 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
2015 error = vfs_setopt(opts, "parent", &i, sizeof(i));
2016 if (error != 0 && error != ENOENT)
2018 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
2019 if (error != 0 && error != ENOENT)
2021 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
2022 sizeof(pr->pr_cpuset->cs_id));
2023 if (error != 0 && error != ENOENT)
2025 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
2026 if (error != 0 && error != ENOENT)
2029 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
2030 pr->pr_ip4s * sizeof(*pr->pr_ip4));
2031 if (error != 0 && error != ENOENT)
2035 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
2036 pr->pr_ip6s * sizeof(*pr->pr_ip6));
2037 if (error != 0 && error != ENOENT)
2040 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
2041 sizeof(pr->pr_securelevel));
2042 if (error != 0 && error != ENOENT)
2044 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
2045 sizeof(pr->pr_childcount));
2046 if (error != 0 && error != ENOENT)
2048 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
2049 sizeof(pr->pr_childmax));
2050 if (error != 0 && error != ENOENT)
2052 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
2053 if (error != 0 && error != ENOENT)
2055 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
2056 if (error != 0 && error != ENOENT)
2058 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
2059 if (error != 0 && error != ENOENT)
2061 #ifdef COMPAT_FREEBSD32
2062 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
2063 uint32_t hid32 = pr->pr_hostid;
2065 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
2068 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
2069 sizeof(pr->pr_hostid));
2070 if (error != 0 && error != ENOENT)
2072 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
2073 sizeof(pr->pr_enforce_statfs));
2074 if (error != 0 && error != ENOENT)
2076 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
2077 sizeof(pr->pr_devfs_rsnum));
2078 if (error != 0 && error != ENOENT)
2080 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
2082 if (pr_flag_names[fi] == NULL)
2084 i = (pr->pr_flags & (1 << fi)) ? 1 : 0;
2085 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i));
2086 if (error != 0 && error != ENOENT)
2089 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i));
2090 if (error != 0 && error != ENOENT)
2093 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
2096 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
2097 i = pr_flag_jailsys[fi].disable &&
2098 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE
2099 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW
2102 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i));
2103 if (error != 0 && error != ENOENT)
2106 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
2108 if (pr_allow_names[fi] == NULL)
2110 i = (pr->pr_allow & (1 << fi)) ? 1 : 0;
2111 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i));
2112 if (error != 0 && error != ENOENT)
2115 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i));
2116 if (error != 0 && error != ENOENT)
2119 i = (pr->pr_uref == 0);
2120 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2121 if (error != 0 && error != ENOENT)
2124 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2125 if (error != 0 && error != ENOENT)
2128 /* Get the module parameters. */
2129 mtx_unlock(&pr->pr_mtx);
2131 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2134 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
2136 /* By now, all parameters should have been noted. */
2137 TAILQ_FOREACH(opt, opts, link) {
2138 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2140 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2145 /* Write the fetched parameters back to userspace. */
2147 TAILQ_FOREACH(opt, opts, link) {
2148 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2149 pos = 2 * opt->pos + 1;
2150 optuio->uio_iov[pos].iov_len = opt->len;
2151 if (opt->value != NULL) {
2152 if (optuio->uio_segflg == UIO_SYSSPACE) {
2154 optuio->uio_iov[pos].iov_base,
2157 error = copyout(opt->value,
2158 optuio->uio_iov[pos].iov_base,
2169 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
2173 sx_sunlock(&allprison_lock);
2175 if (error && errmsg_pos >= 0) {
2176 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2177 errmsg_pos = 2 * errmsg_pos + 1;
2178 if (errmsg_len > 0) {
2179 if (optuio->uio_segflg == UIO_SYSSPACE)
2181 optuio->uio_iov[errmsg_pos].iov_base,
2185 optuio->uio_iov[errmsg_pos].iov_base,
2195 * struct jail_remove_args {
2200 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
2202 struct prison *pr, *cpr, *lpr, *tpr;
2205 error = priv_check(td, PRIV_JAIL_REMOVE);
2209 sx_xlock(&allprison_lock);
2210 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2212 sx_xunlock(&allprison_lock);
2216 /* Remove all descendants of this prison, then remove this prison. */
2218 pr->pr_flags |= PR_REMOVE;
2219 if (!LIST_EMPTY(&pr->pr_children)) {
2220 mtx_unlock(&pr->pr_mtx);
2222 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
2223 mtx_lock(&cpr->pr_mtx);
2224 if (cpr->pr_ref > 0) {
2227 cpr->pr_flags |= PR_REMOVE;
2229 /* Already removed - do not do it again. */
2232 mtx_unlock(&cpr->pr_mtx);
2234 mtx_lock(&lpr->pr_mtx);
2235 prison_remove_one(lpr);
2236 sx_xlock(&allprison_lock);
2241 mtx_lock(&lpr->pr_mtx);
2242 prison_remove_one(lpr);
2243 sx_xlock(&allprison_lock);
2245 mtx_lock(&pr->pr_mtx);
2247 prison_remove_one(pr);
2252 prison_remove_one(struct prison *pr)
2257 /* If the prison was persistent, it is not anymore. */
2259 if (pr->pr_flags & PR_PERSIST) {
2262 pr->pr_flags &= ~PR_PERSIST;
2266 * jail_remove added a reference. If that's the only one, remove
2269 KASSERT(pr->pr_ref > 0,
2270 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
2271 if (pr->pr_ref == 1) {
2273 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
2277 mtx_unlock(&pr->pr_mtx);
2278 sx_xunlock(&allprison_lock);
2280 * Kill all processes unfortunate enough to be attached to this prison.
2282 sx_slock(&allproc_lock);
2283 LIST_FOREACH(p, &allproc, p_list) {
2285 if (p->p_state != PRS_NEW && p->p_ucred &&
2286 p->p_ucred->cr_prison == pr)
2287 kern_psignal(p, SIGKILL);
2290 sx_sunlock(&allproc_lock);
2291 /* Remove the temporary reference added by jail_remove. */
2292 prison_deref(pr, deuref | PD_DEREF);
2297 * struct jail_attach_args {
2302 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
2307 error = priv_check(td, PRIV_JAIL_ATTACH);
2311 sx_slock(&allprison_lock);
2312 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2314 sx_sunlock(&allprison_lock);
2319 * Do not allow a process to attach to a prison that is not
2320 * considered to be "alive".
2322 if (pr->pr_uref == 0) {
2323 mtx_unlock(&pr->pr_mtx);
2324 sx_sunlock(&allprison_lock);
2328 return (do_jail_attach(td, pr));
2332 do_jail_attach(struct thread *td, struct prison *pr)
2336 struct ucred *newcred, *oldcred;
2340 * XXX: Note that there is a slight race here if two threads
2341 * in the same privileged process attempt to attach to two
2342 * different jails at the same time. It is important for
2343 * user processes not to do this, or they might end up with
2344 * a process root from one prison, but attached to the jail
2349 mtx_unlock(&pr->pr_mtx);
2351 /* Let modules do whatever they need to prepare for attaching. */
2352 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
2354 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
2357 sx_sunlock(&allprison_lock);
2360 * Reparent the newly attached process to this jail.
2362 ppr = td->td_ucred->cr_prison;
2364 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
2368 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
2369 if ((error = change_dir(pr->pr_root, td)) != 0)
2372 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
2375 VOP_UNLOCK(pr->pr_root, 0);
2376 if ((error = change_root(pr->pr_root, td)))
2381 oldcred = p->p_ucred;
2383 crcopy(newcred, oldcred);
2384 newcred->cr_prison = pr;
2385 p->p_ucred = newcred;
2388 racct_proc_ucred_changed(p, oldcred, newcred);
2391 prison_deref(ppr, PD_DEREF | PD_DEUREF);
2394 VOP_UNLOCK(pr->pr_root, 0);
2396 /* Tell modules this thread is still in its old jail after all. */
2397 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td);
2398 prison_deref(pr, PD_DEREF | PD_DEUREF);
2404 * Returns a locked prison instance, or NULL on failure.
2407 prison_find(int prid)
2411 sx_assert(&allprison_lock, SX_LOCKED);
2412 TAILQ_FOREACH(pr, &allprison, pr_list) {
2413 if (pr->pr_id == prid) {
2414 mtx_lock(&pr->pr_mtx);
2417 mtx_unlock(&pr->pr_mtx);
2424 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
2427 prison_find_child(struct prison *mypr, int prid)
2432 sx_assert(&allprison_lock, SX_LOCKED);
2433 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2434 if (pr->pr_id == prid) {
2435 mtx_lock(&pr->pr_mtx);
2438 mtx_unlock(&pr->pr_mtx);
2445 * Look for the name relative to mypr. Returns a locked prison or NULL.
2448 prison_find_name(struct prison *mypr, const char *name)
2450 struct prison *pr, *deadpr;
2454 sx_assert(&allprison_lock, SX_LOCKED);
2455 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
2458 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2459 if (!strcmp(pr->pr_name + mylen, name)) {
2460 mtx_lock(&pr->pr_mtx);
2461 if (pr->pr_ref > 0) {
2462 if (pr->pr_uref > 0)
2466 mtx_unlock(&pr->pr_mtx);
2469 /* There was no valid prison - perhaps there was a dying one. */
2470 if (deadpr != NULL) {
2471 mtx_lock(&deadpr->pr_mtx);
2472 if (deadpr->pr_ref == 0) {
2473 mtx_unlock(&deadpr->pr_mtx);
2481 * See if a prison has the specific flag set.
2484 prison_flag(struct ucred *cred, unsigned flag)
2487 /* This is an atomic read, so no locking is necessary. */
2488 return (cred->cr_prison->pr_flags & flag);
2492 prison_allow(struct ucred *cred, unsigned flag)
2495 /* This is an atomic read, so no locking is necessary. */
2496 return (cred->cr_prison->pr_allow & flag);
2500 * Remove a prison reference. If that was the last reference, remove the
2501 * prison itself - but not in this context in case there are locks held.
2504 prison_free_locked(struct prison *pr)
2507 mtx_assert(&pr->pr_mtx, MA_OWNED);
2509 if (pr->pr_ref == 0) {
2510 mtx_unlock(&pr->pr_mtx);
2511 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
2512 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2515 mtx_unlock(&pr->pr_mtx);
2519 prison_free(struct prison *pr)
2522 mtx_lock(&pr->pr_mtx);
2523 prison_free_locked(pr);
2527 prison_complete(void *context, int pending)
2530 prison_deref((struct prison *)context, 0);
2534 * Remove a prison reference (usually). This internal version assumes no
2535 * mutexes are held, except perhaps the prison itself. If there are no more
2536 * references, release and delist the prison. On completion, the prison lock
2537 * and the allprison lock are both unlocked.
2540 prison_deref(struct prison *pr, int flags)
2542 struct prison *ppr, *tpr;
2544 if (!(flags & PD_LOCKED))
2545 mtx_lock(&pr->pr_mtx);
2547 if (flags & PD_DEUREF) {
2549 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0"));
2551 if (flags & PD_DEREF)
2553 /* If the prison still has references, nothing else to do. */
2554 if (pr->pr_ref > 0) {
2555 mtx_unlock(&pr->pr_mtx);
2556 if (flags & PD_LIST_SLOCKED)
2557 sx_sunlock(&allprison_lock);
2558 else if (flags & PD_LIST_XLOCKED)
2559 sx_xunlock(&allprison_lock);
2563 mtx_unlock(&pr->pr_mtx);
2564 if (flags & PD_LIST_SLOCKED) {
2565 if (!sx_try_upgrade(&allprison_lock)) {
2566 sx_sunlock(&allprison_lock);
2567 sx_xlock(&allprison_lock);
2569 } else if (!(flags & PD_LIST_XLOCKED))
2570 sx_xlock(&allprison_lock);
2572 TAILQ_REMOVE(&allprison, pr, pr_list);
2573 LIST_REMOVE(pr, pr_sibling);
2574 ppr = pr->pr_parent;
2575 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
2576 tpr->pr_childcount--;
2577 sx_xunlock(&allprison_lock);
2580 if (pr->pr_vnet != ppr->pr_vnet)
2581 vnet_destroy(pr->pr_vnet);
2583 if (pr->pr_root != NULL)
2585 mtx_destroy(&pr->pr_mtx);
2587 free(pr->pr_ip4, M_PRISON);
2590 free(pr->pr_ip6, M_PRISON);
2592 if (pr->pr_cpuset != NULL)
2593 cpuset_rel(pr->pr_cpuset);
2596 prison_racct_detach(pr);
2600 /* Removing a prison frees a reference on its parent. */
2602 mtx_lock(&pr->pr_mtx);
2603 flags = PD_DEREF | PD_DEUREF;
2608 prison_hold_locked(struct prison *pr)
2611 mtx_assert(&pr->pr_mtx, MA_OWNED);
2612 KASSERT(pr->pr_ref > 0,
2613 ("Trying to hold dead prison (jid=%d).", pr->pr_id));
2618 prison_hold(struct prison *pr)
2621 mtx_lock(&pr->pr_mtx);
2622 prison_hold_locked(pr);
2623 mtx_unlock(&pr->pr_mtx);
2627 prison_proc_hold(struct prison *pr)
2630 mtx_lock(&pr->pr_mtx);
2631 KASSERT(pr->pr_uref > 0,
2632 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
2634 mtx_unlock(&pr->pr_mtx);
2638 prison_proc_free(struct prison *pr)
2641 mtx_lock(&pr->pr_mtx);
2642 KASSERT(pr->pr_uref > 0,
2643 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
2644 prison_deref(pr, PD_DEUREF | PD_LOCKED);
2650 * Restrict a prison's IP address list with its parent's, possibly replacing
2651 * it. Return true if the replacement buffer was used (or would have been).
2654 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
2659 ppr = pr->pr_parent;
2660 if (!(pr->pr_flags & PR_IP4_USER)) {
2661 /* This has no user settings, so just copy the parent's list. */
2662 if (pr->pr_ip4s < ppr->pr_ip4s) {
2664 * There's no room for the parent's list. Use the
2665 * new list buffer, which is assumed to be big enough
2666 * (if it was passed). If there's no buffer, try to
2670 if (newip4 == NULL) {
2671 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
2672 M_PRISON, M_NOWAIT);
2676 if (newip4 != NULL) {
2677 bcopy(ppr->pr_ip4, newip4,
2678 ppr->pr_ip4s * sizeof(*newip4));
2679 free(pr->pr_ip4, M_PRISON);
2680 pr->pr_ip4 = newip4;
2681 pr->pr_ip4s = ppr->pr_ip4s;
2685 pr->pr_ip4s = ppr->pr_ip4s;
2686 if (pr->pr_ip4s > 0)
2687 bcopy(ppr->pr_ip4, pr->pr_ip4,
2688 pr->pr_ip4s * sizeof(*newip4));
2689 else if (pr->pr_ip4 != NULL) {
2690 free(pr->pr_ip4, M_PRISON);
2693 } else if (pr->pr_ip4s > 0) {
2694 /* Remove addresses that aren't in the parent. */
2695 for (ij = 0; ij < ppr->pr_ip4s; ij++)
2696 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
2698 if (ij < ppr->pr_ip4s)
2701 bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
2702 --pr->pr_ip4s * sizeof(*pr->pr_ip4));
2705 for (ij = 1; ii < pr->pr_ip4s; ) {
2706 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
2710 switch (ij >= ppr->pr_ip4s ? -1 :
2711 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
2713 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
2714 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
2725 if (pr->pr_ip4s == 0) {
2726 pr->pr_flags |= PR_IP4_DISABLE;
2727 free(pr->pr_ip4, M_PRISON);
2735 * Pass back primary IPv4 address of this jail.
2737 * If not restricted return success but do not alter the address. Caller has
2738 * to make sure to initialize it correctly (e.g. INADDR_ANY).
2740 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2741 * Address returned in NBO.
2744 prison_get_ip4(struct ucred *cred, struct in_addr *ia)
2748 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2749 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2751 pr = cred->cr_prison;
2752 if (!(pr->pr_flags & PR_IP4))
2754 mtx_lock(&pr->pr_mtx);
2755 if (!(pr->pr_flags & PR_IP4)) {
2756 mtx_unlock(&pr->pr_mtx);
2759 if (pr->pr_ip4 == NULL) {
2760 mtx_unlock(&pr->pr_mtx);
2761 return (EAFNOSUPPORT);
2764 ia->s_addr = pr->pr_ip4[0].s_addr;
2765 mtx_unlock(&pr->pr_mtx);
2770 * Return 1 if we should do proper source address selection or are not jailed.
2771 * We will return 0 if we should bypass source address selection in favour
2772 * of the primary jail IPv4 address. Only in this case *ia will be updated and
2774 * Return EAFNOSUPPORT, in case this jail does not allow IPv4.
2777 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
2783 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2784 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2789 pr = cred->cr_prison;
2790 if (pr->pr_flags & PR_IP4_SADDRSEL)
2793 lia.s_addr = INADDR_ANY;
2794 error = prison_get_ip4(cred, &lia);
2797 if (lia.s_addr == INADDR_ANY)
2800 ia->s_addr = lia.s_addr;
2805 * Return true if pr1 and pr2 have the same IPv4 address restrictions.
2808 prison_equal_ip4(struct prison *pr1, struct prison *pr2)
2815 * No need to lock since the PR_IP4_USER flag can't be altered for
2818 while (pr1 != &prison0 &&
2820 !(pr1->pr_flags & PR_VNET) &&
2822 !(pr1->pr_flags & PR_IP4_USER))
2823 pr1 = pr1->pr_parent;
2824 while (pr2 != &prison0 &&
2826 !(pr2->pr_flags & PR_VNET) &&
2828 !(pr2->pr_flags & PR_IP4_USER))
2829 pr2 = pr2->pr_parent;
2830 return (pr1 == pr2);
2834 * Make sure our (source) address is set to something meaningful to this
2837 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2838 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2839 * doesn't allow IPv4. Address passed in in NBO and returned in NBO.
2842 prison_local_ip4(struct ucred *cred, struct in_addr *ia)
2848 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2849 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2851 pr = cred->cr_prison;
2852 if (!(pr->pr_flags & PR_IP4))
2854 mtx_lock(&pr->pr_mtx);
2855 if (!(pr->pr_flags & PR_IP4)) {
2856 mtx_unlock(&pr->pr_mtx);
2859 if (pr->pr_ip4 == NULL) {
2860 mtx_unlock(&pr->pr_mtx);
2861 return (EAFNOSUPPORT);
2864 ia0.s_addr = ntohl(ia->s_addr);
2865 if (ia0.s_addr == INADDR_LOOPBACK) {
2866 ia->s_addr = pr->pr_ip4[0].s_addr;
2867 mtx_unlock(&pr->pr_mtx);
2871 if (ia0.s_addr == INADDR_ANY) {
2873 * In case there is only 1 IPv4 address, bind directly.
2875 if (pr->pr_ip4s == 1)
2876 ia->s_addr = pr->pr_ip4[0].s_addr;
2877 mtx_unlock(&pr->pr_mtx);
2881 error = _prison_check_ip4(pr, ia);
2882 mtx_unlock(&pr->pr_mtx);
2887 * Rewrite destination address in case we will connect to loopback address.
2889 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2890 * Address passed in in NBO and returned in NBO.
2893 prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
2897 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2898 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2900 pr = cred->cr_prison;
2901 if (!(pr->pr_flags & PR_IP4))
2903 mtx_lock(&pr->pr_mtx);
2904 if (!(pr->pr_flags & PR_IP4)) {
2905 mtx_unlock(&pr->pr_mtx);
2908 if (pr->pr_ip4 == NULL) {
2909 mtx_unlock(&pr->pr_mtx);
2910 return (EAFNOSUPPORT);
2913 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) {
2914 ia->s_addr = pr->pr_ip4[0].s_addr;
2915 mtx_unlock(&pr->pr_mtx);
2920 * Return success because nothing had to be changed.
2922 mtx_unlock(&pr->pr_mtx);
2927 * Check if given address belongs to the jail referenced by cred/prison.
2929 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2930 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2931 * doesn't allow IPv4. Address passed in in NBO.
2934 _prison_check_ip4(struct prison *pr, struct in_addr *ia)
2939 * Check the primary IP.
2941 if (pr->pr_ip4[0].s_addr == ia->s_addr)
2945 * All the other IPs are sorted so we can do a binary search.
2948 z = pr->pr_ip4s - 2;
2951 d = qcmp_v4(&pr->pr_ip4[i+1], ia);
2960 return (EADDRNOTAVAIL);
2964 prison_check_ip4(struct ucred *cred, struct in_addr *ia)
2969 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2970 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2972 pr = cred->cr_prison;
2973 if (!(pr->pr_flags & PR_IP4))
2975 mtx_lock(&pr->pr_mtx);
2976 if (!(pr->pr_flags & PR_IP4)) {
2977 mtx_unlock(&pr->pr_mtx);
2980 if (pr->pr_ip4 == NULL) {
2981 mtx_unlock(&pr->pr_mtx);
2982 return (EAFNOSUPPORT);
2985 error = _prison_check_ip4(pr, ia);
2986 mtx_unlock(&pr->pr_mtx);
2993 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
2998 ppr = pr->pr_parent;
2999 if (!(pr->pr_flags & PR_IP6_USER)) {
3000 /* This has no user settings, so just copy the parent's list. */
3001 if (pr->pr_ip6s < ppr->pr_ip6s) {
3003 * There's no room for the parent's list. Use the
3004 * new list buffer, which is assumed to be big enough
3005 * (if it was passed). If there's no buffer, try to
3009 if (newip6 == NULL) {
3010 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
3011 M_PRISON, M_NOWAIT);
3015 if (newip6 != NULL) {
3016 bcopy(ppr->pr_ip6, newip6,
3017 ppr->pr_ip6s * sizeof(*newip6));
3018 free(pr->pr_ip6, M_PRISON);
3019 pr->pr_ip6 = newip6;
3020 pr->pr_ip6s = ppr->pr_ip6s;
3024 pr->pr_ip6s = ppr->pr_ip6s;
3025 if (pr->pr_ip6s > 0)
3026 bcopy(ppr->pr_ip6, pr->pr_ip6,
3027 pr->pr_ip6s * sizeof(*newip6));
3028 else if (pr->pr_ip6 != NULL) {
3029 free(pr->pr_ip6, M_PRISON);
3032 } else if (pr->pr_ip6s > 0) {
3033 /* Remove addresses that aren't in the parent. */
3034 for (ij = 0; ij < ppr->pr_ip6s; ij++)
3035 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
3038 if (ij < ppr->pr_ip6s)
3041 bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
3042 --pr->pr_ip6s * sizeof(*pr->pr_ip6));
3045 for (ij = 1; ii < pr->pr_ip6s; ) {
3046 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
3051 switch (ij >= ppr->pr_ip6s ? -1 :
3052 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
3054 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
3055 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
3066 if (pr->pr_ip6s == 0) {
3067 pr->pr_flags |= PR_IP6_DISABLE;
3068 free(pr->pr_ip6, M_PRISON);
3076 * Pass back primary IPv6 address for this jail.
3078 * If not restricted return success but do not alter the address. Caller has
3079 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
3081 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3084 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
3088 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3089 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3091 pr = cred->cr_prison;
3092 if (!(pr->pr_flags & PR_IP6))
3094 mtx_lock(&pr->pr_mtx);
3095 if (!(pr->pr_flags & PR_IP6)) {
3096 mtx_unlock(&pr->pr_mtx);
3099 if (pr->pr_ip6 == NULL) {
3100 mtx_unlock(&pr->pr_mtx);
3101 return (EAFNOSUPPORT);
3104 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3105 mtx_unlock(&pr->pr_mtx);
3110 * Return 1 if we should do proper source address selection or are not jailed.
3111 * We will return 0 if we should bypass source address selection in favour
3112 * of the primary jail IPv6 address. Only in this case *ia will be updated and
3114 * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
3117 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
3120 struct in6_addr lia6;
3123 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3124 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3129 pr = cred->cr_prison;
3130 if (pr->pr_flags & PR_IP6_SADDRSEL)
3134 error = prison_get_ip6(cred, &lia6);
3137 if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
3140 bcopy(&lia6, ia6, sizeof(struct in6_addr));
3145 * Return true if pr1 and pr2 have the same IPv6 address restrictions.
3148 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
3154 while (pr1 != &prison0 &&
3156 !(pr1->pr_flags & PR_VNET) &&
3158 !(pr1->pr_flags & PR_IP6_USER))
3159 pr1 = pr1->pr_parent;
3160 while (pr2 != &prison0 &&
3162 !(pr2->pr_flags & PR_VNET) &&
3164 !(pr2->pr_flags & PR_IP6_USER))
3165 pr2 = pr2->pr_parent;
3166 return (pr1 == pr2);
3170 * Make sure our (source) address is set to something meaningful to this jail.
3172 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
3173 * when needed while binding.
3175 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3176 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3177 * doesn't allow IPv6.
3180 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
3185 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3186 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3188 pr = cred->cr_prison;
3189 if (!(pr->pr_flags & PR_IP6))
3191 mtx_lock(&pr->pr_mtx);
3192 if (!(pr->pr_flags & PR_IP6)) {
3193 mtx_unlock(&pr->pr_mtx);
3196 if (pr->pr_ip6 == NULL) {
3197 mtx_unlock(&pr->pr_mtx);
3198 return (EAFNOSUPPORT);
3201 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3202 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3203 mtx_unlock(&pr->pr_mtx);
3207 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
3209 * In case there is only 1 IPv6 address, and v6only is true,
3210 * then bind directly.
3212 if (v6only != 0 && pr->pr_ip6s == 1)
3213 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3214 mtx_unlock(&pr->pr_mtx);
3218 error = _prison_check_ip6(pr, ia6);
3219 mtx_unlock(&pr->pr_mtx);
3224 * Rewrite destination address in case we will connect to loopback address.
3226 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3229 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
3233 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3234 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3236 pr = cred->cr_prison;
3237 if (!(pr->pr_flags & PR_IP6))
3239 mtx_lock(&pr->pr_mtx);
3240 if (!(pr->pr_flags & PR_IP6)) {
3241 mtx_unlock(&pr->pr_mtx);
3244 if (pr->pr_ip6 == NULL) {
3245 mtx_unlock(&pr->pr_mtx);
3246 return (EAFNOSUPPORT);
3249 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3250 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3251 mtx_unlock(&pr->pr_mtx);
3256 * Return success because nothing had to be changed.
3258 mtx_unlock(&pr->pr_mtx);
3263 * Check if given address belongs to the jail referenced by cred/prison.
3265 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3266 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3267 * doesn't allow IPv6.
3270 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6)
3275 * Check the primary IP.
3277 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
3281 * All the other IPs are sorted so we can do a binary search.
3284 z = pr->pr_ip6s - 2;
3287 d = qcmp_v6(&pr->pr_ip6[i+1], ia6);
3296 return (EADDRNOTAVAIL);
3300 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6)
3305 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3306 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3308 pr = cred->cr_prison;
3309 if (!(pr->pr_flags & PR_IP6))
3311 mtx_lock(&pr->pr_mtx);
3312 if (!(pr->pr_flags & PR_IP6)) {
3313 mtx_unlock(&pr->pr_mtx);
3316 if (pr->pr_ip6 == NULL) {
3317 mtx_unlock(&pr->pr_mtx);
3318 return (EAFNOSUPPORT);
3321 error = _prison_check_ip6(pr, ia6);
3322 mtx_unlock(&pr->pr_mtx);
3328 * Check if a jail supports the given address family.
3330 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
3334 prison_check_af(struct ucred *cred, int af)
3339 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3341 pr = cred->cr_prison;
3343 /* Prisons with their own network stack are not limited. */
3344 if (prison_owns_vnet(cred))
3353 if (pr->pr_flags & PR_IP4)
3355 mtx_lock(&pr->pr_mtx);
3356 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
3357 error = EAFNOSUPPORT;
3358 mtx_unlock(&pr->pr_mtx);
3364 if (pr->pr_flags & PR_IP6)
3366 mtx_lock(&pr->pr_mtx);
3367 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
3368 error = EAFNOSUPPORT;
3369 mtx_unlock(&pr->pr_mtx);
3377 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
3378 error = EAFNOSUPPORT;
3384 * Check if given address belongs to the jail referenced by cred (wrapper to
3385 * prison_check_ip[46]).
3387 * Returns 0 if jail doesn't restrict the address family or if address belongs
3388 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
3389 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
3392 prison_if(struct ucred *cred, struct sockaddr *sa)
3395 struct sockaddr_in *sai;
3398 struct sockaddr_in6 *sai6;
3402 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3403 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
3406 if (prison_owns_vnet(cred))
3411 switch (sa->sa_family)
3415 sai = (struct sockaddr_in *)sa;
3416 error = prison_check_ip4(cred, &sai->sin_addr);
3421 sai6 = (struct sockaddr_in6 *)sa;
3422 error = prison_check_ip6(cred, &sai6->sin6_addr);
3426 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
3427 error = EAFNOSUPPORT;
3433 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
3436 prison_check(struct ucred *cred1, struct ucred *cred2)
3439 return ((cred1->cr_prison == cred2->cr_prison ||
3440 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
3444 * Return 1 if p2 is a child of p1, otherwise 0.
3447 prison_ischild(struct prison *pr1, struct prison *pr2)
3450 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
3457 * Return 1 if the passed credential is in a jail, otherwise 0.
3460 jailed(struct ucred *cred)
3463 return (cred->cr_prison != &prison0);
3467 * Return 1 if the passed credential is in a jail and that jail does not
3468 * have its own virtual network stack, otherwise 0.
3471 jailed_without_vnet(struct ucred *cred)
3477 if (prison_owns_vnet(cred))
3485 * Return the correct hostname (domainname, et al) for the passed credential.
3488 getcredhostname(struct ucred *cred, char *buf, size_t size)
3493 * A NULL credential can be used to shortcut to the physical
3494 * system's hostname.
3496 pr = (cred != NULL) ? cred->cr_prison : &prison0;
3497 mtx_lock(&pr->pr_mtx);
3498 strlcpy(buf, pr->pr_hostname, size);
3499 mtx_unlock(&pr->pr_mtx);
3503 getcreddomainname(struct ucred *cred, char *buf, size_t size)
3506 mtx_lock(&cred->cr_prison->pr_mtx);
3507 strlcpy(buf, cred->cr_prison->pr_domainname, size);
3508 mtx_unlock(&cred->cr_prison->pr_mtx);
3512 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
3515 mtx_lock(&cred->cr_prison->pr_mtx);
3516 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
3517 mtx_unlock(&cred->cr_prison->pr_mtx);
3521 getcredhostid(struct ucred *cred, unsigned long *hostid)
3524 mtx_lock(&cred->cr_prison->pr_mtx);
3525 *hostid = cred->cr_prison->pr_hostid;
3526 mtx_unlock(&cred->cr_prison->pr_mtx);
3531 * Determine whether the prison represented by cred owns
3532 * its vnet rather than having it inherited.
3534 * Returns 1 in case the prison owns the vnet, 0 otherwise.
3537 prison_owns_vnet(struct ucred *cred)
3541 * vnets cannot be added/removed after jail creation,
3542 * so no need to lock here.
3544 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
3549 * Determine whether the subject represented by cred can "see"
3550 * status of a mount point.
3551 * Returns: 0 for permitted, ENOENT otherwise.
3552 * XXX: This function should be called cr_canseemount() and should be
3553 * placed in kern_prot.c.
3556 prison_canseemount(struct ucred *cred, struct mount *mp)
3562 pr = cred->cr_prison;
3563 if (pr->pr_enforce_statfs == 0)
3565 if (pr->pr_root->v_mount == mp)
3567 if (pr->pr_enforce_statfs == 2)
3570 * If jail's chroot directory is set to "/" we should be able to see
3571 * all mount-points from inside a jail.
3572 * This is ugly check, but this is the only situation when jail's
3573 * directory ends with '/'.
3575 if (strcmp(pr->pr_path, "/") == 0)
3577 len = strlen(pr->pr_path);
3579 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
3582 * Be sure that we don't have situation where jail's root directory
3583 * is "/some/path" and mount point is "/some/pathpath".
3585 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
3591 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
3593 char jpath[MAXPATHLEN];
3597 pr = cred->cr_prison;
3598 if (pr->pr_enforce_statfs == 0)
3600 if (prison_canseemount(cred, mp) != 0) {
3601 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3602 strlcpy(sp->f_mntonname, "[restricted]",
3603 sizeof(sp->f_mntonname));
3606 if (pr->pr_root->v_mount == mp) {
3608 * Clear current buffer data, so we are sure nothing from
3609 * the valid path left there.
3611 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3612 *sp->f_mntonname = '/';
3616 * If jail's chroot directory is set to "/" we should be able to see
3617 * all mount-points from inside a jail.
3619 if (strcmp(pr->pr_path, "/") == 0)
3621 len = strlen(pr->pr_path);
3622 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
3624 * Clear current buffer data, so we are sure nothing from
3625 * the valid path left there.
3627 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3628 if (*jpath == '\0') {
3629 /* Should never happen. */
3630 *sp->f_mntonname = '/';
3632 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
3637 * Check with permission for a specific privilege is granted within jail. We
3638 * have a specific list of accepted privileges; the rest are denied.
3641 prison_priv_check(struct ucred *cred, int priv)
3649 * Privileges specific to prisons with a virtual network stack.
3650 * There might be a duplicate entry here in case the privilege
3651 * is only granted conditionally in the legacy jail case.
3656 * NFS-specific privileges.
3658 case PRIV_NFS_DAEMON:
3659 case PRIV_NFS_LOCKD:
3662 * Network stack privileges.
3664 case PRIV_NET_BRIDGE:
3667 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
3668 case PRIV_NET_ROUTE:
3670 case PRIV_NET_SETIFMTU:
3671 case PRIV_NET_SETIFFLAGS:
3672 case PRIV_NET_SETIFCAP:
3673 case PRIV_NET_SETIFDESCR:
3674 case PRIV_NET_SETIFNAME :
3675 case PRIV_NET_SETIFMETRIC:
3676 case PRIV_NET_SETIFPHYS:
3677 case PRIV_NET_SETIFMAC:
3678 case PRIV_NET_ADDMULTI:
3679 case PRIV_NET_DELMULTI:
3680 case PRIV_NET_HWIOCTL:
3681 case PRIV_NET_SETLLADDR:
3682 case PRIV_NET_ADDIFGROUP:
3683 case PRIV_NET_DELIFGROUP:
3684 case PRIV_NET_IFCREATE:
3685 case PRIV_NET_IFDESTROY:
3686 case PRIV_NET_ADDIFADDR:
3687 case PRIV_NET_DELIFADDR:
3690 case PRIV_NET_SETIFVNET:
3691 case PRIV_NET_SETIFFIB:
3694 * 802.11-related privileges.
3696 case PRIV_NET80211_GETKEY:
3698 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */
3703 * AppleTalk privileges.
3705 case PRIV_NETATALK_RESERVEDPORT:
3710 case PRIV_NETATM_CFG:
3711 case PRIV_NETATM_ADD:
3712 case PRIV_NETATM_DEL:
3713 case PRIV_NETATM_SET:
3716 * Bluetooth privileges.
3718 case PRIV_NETBLUETOOTH_RAW:
3722 * Netgraph and netgraph module privileges.
3724 case PRIV_NETGRAPH_CONTROL:
3726 case PRIV_NETGRAPH_TTY:
3730 * IPv4 and IPv6 privileges.
3732 case PRIV_NETINET_IPFW:
3733 case PRIV_NETINET_DIVERT:
3734 case PRIV_NETINET_PF:
3735 case PRIV_NETINET_DUMMYNET:
3736 case PRIV_NETINET_CARP:
3737 case PRIV_NETINET_MROUTE:
3738 case PRIV_NETINET_RAW:
3739 case PRIV_NETINET_ADDRCTRL6:
3740 case PRIV_NETINET_ND6:
3741 case PRIV_NETINET_SCOPE6:
3742 case PRIV_NETINET_ALIFETIME6:
3743 case PRIV_NETINET_IPSEC:
3744 case PRIV_NETINET_BINDANY:
3748 * IPX/SPX privileges.
3750 case PRIV_NETIPX_RESERVEDPORT:
3751 case PRIV_NETIPX_RAW:
3765 * No default: or deny here.
3766 * In case of no permit fall through to next switch().
3768 if (cred->cr_prison->pr_flags & PR_VNET)
3776 * Allow ktrace privileges for root in jail.
3782 * Allow jailed processes to configure audit identity and
3783 * submit audit records (login, etc). In the future we may
3784 * want to further refine the relationship between audit and
3787 case PRIV_AUDIT_GETAUDIT:
3788 case PRIV_AUDIT_SETAUDIT:
3789 case PRIV_AUDIT_SUBMIT:
3793 * Allow jailed processes to manipulate process UNIX
3794 * credentials in any way they see fit.
3796 case PRIV_CRED_SETUID:
3797 case PRIV_CRED_SETEUID:
3798 case PRIV_CRED_SETGID:
3799 case PRIV_CRED_SETEGID:
3800 case PRIV_CRED_SETGROUPS:
3801 case PRIV_CRED_SETREUID:
3802 case PRIV_CRED_SETREGID:
3803 case PRIV_CRED_SETRESUID:
3804 case PRIV_CRED_SETRESGID:
3807 * Jail implements visibility constraints already, so allow
3808 * jailed root to override uid/gid-based constraints.
3810 case PRIV_SEEOTHERGIDS:
3811 case PRIV_SEEOTHERUIDS:
3814 * Jail implements inter-process debugging limits already, so
3815 * allow jailed root various debugging privileges.
3817 case PRIV_DEBUG_DIFFCRED:
3818 case PRIV_DEBUG_SUGID:
3819 case PRIV_DEBUG_UNPRIV:
3822 * Allow jail to set various resource limits and login
3823 * properties, and for now, exceed process resource limits.
3825 case PRIV_PROC_LIMIT:
3826 case PRIV_PROC_SETLOGIN:
3827 case PRIV_PROC_SETRLIMIT:
3830 * System V and POSIX IPC privileges are granted in jail.
3833 case PRIV_IPC_WRITE:
3834 case PRIV_IPC_ADMIN:
3835 case PRIV_IPC_MSGSIZE:
3839 * Jail operations within a jail work on child jails.
3841 case PRIV_JAIL_ATTACH:
3843 case PRIV_JAIL_REMOVE:
3846 * Jail implements its own inter-process limits, so allow
3847 * root processes in jail to change scheduling on other
3848 * processes in the same jail. Likewise for signalling.
3850 case PRIV_SCHED_DIFFCRED:
3851 case PRIV_SCHED_CPUSET:
3852 case PRIV_SIGNAL_DIFFCRED:
3853 case PRIV_SIGNAL_SUGID:
3856 * Allow jailed processes to write to sysctls marked as jail
3859 case PRIV_SYSCTL_WRITEJAIL:
3862 * Allow root in jail to manage a variety of quota
3863 * properties. These should likely be conditional on a
3864 * configuration option.
3866 case PRIV_VFS_GETQUOTA:
3867 case PRIV_VFS_SETQUOTA:
3870 * Since Jail relies on chroot() to implement file system
3871 * protections, grant many VFS privileges to root in jail.
3872 * Be careful to exclude mount-related and NFS-related
3876 case PRIV_VFS_WRITE:
3877 case PRIV_VFS_ADMIN:
3879 case PRIV_VFS_LOOKUP:
3880 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
3881 case PRIV_VFS_CHFLAGS_DEV:
3882 case PRIV_VFS_CHOWN:
3883 case PRIV_VFS_CHROOT:
3884 case PRIV_VFS_RETAINSUGID:
3885 case PRIV_VFS_FCHROOT:
3887 case PRIV_VFS_SETGID:
3889 case PRIV_VFS_STICKYFILE:
3892 * As in the non-jail case, non-root users are expected to be
3893 * able to read kernel/phyiscal memory (provided /dev/[k]mem
3894 * exists in the jail and they have permission to access it).
3896 case PRIV_KMEM_READ:
3900 * Depending on the global setting, allow privilege of
3901 * setting system flags.
3903 case PRIV_VFS_SYSFLAGS:
3904 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
3910 * Depending on the global setting, allow privilege of
3911 * mounting/unmounting file systems.
3913 case PRIV_VFS_MOUNT:
3914 case PRIV_VFS_UNMOUNT:
3915 case PRIV_VFS_MOUNT_NONUSER:
3916 case PRIV_VFS_MOUNT_OWNER:
3917 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT &&
3918 cred->cr_prison->pr_enforce_statfs < 2)
3924 * Allow jailed root to bind reserved ports and reuse in-use
3927 case PRIV_NETINET_RESERVEDPORT:
3928 case PRIV_NETINET_REUSEPORT:
3932 * Allow jailed root to set certian IPv4/6 (option) headers.
3934 case PRIV_NETINET_SETHDROPTS:
3938 * Conditionally allow creating raw sockets in jail.
3940 case PRIV_NETINET_RAW:
3941 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
3947 * Since jail implements its own visibility limits on netstat
3948 * sysctls, allow getcred. This allows identd to work in
3951 case PRIV_NETINET_GETCRED:
3955 * Allow jailed root to set loginclass.
3957 case PRIV_PROC_SETLOGINCLASS:
3962 * In all remaining cases, deny the privilege request. This
3963 * includes almost all network privileges, many system
3964 * configuration privileges.
3971 * Return the part of pr2's name that is relative to pr1, or the whole name
3972 * if it does not directly follow.
3976 prison_name(struct prison *pr1, struct prison *pr2)
3980 /* Jails see themselves as "0" (if they see themselves at all). */
3983 name = pr2->pr_name;
3984 if (prison_ischild(pr1, pr2)) {
3986 * pr1 isn't locked (and allprison_lock may not be either)
3987 * so its length can't be counted on. But the number of dots
3988 * can be counted on - and counted.
3990 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
3991 name = strchr(name, '.') + 1;
3997 * Return the part of pr2's path that is relative to pr1, or the whole path
3998 * if it does not directly follow.
4001 prison_path(struct prison *pr1, struct prison *pr2)
4003 char *path1, *path2;
4006 path1 = pr1->pr_path;
4007 path2 = pr2->pr_path;
4008 if (!strcmp(path1, "/"))
4010 len1 = strlen(path1);
4011 if (strncmp(path1, path2, len1))
4013 if (path2[len1] == '\0')
4015 if (path2[len1] == '/')
4016 return (path2 + len1);
4022 * Jail-related sysctls.
4024 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
4028 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
4031 struct prison *pr, *cpr;
4033 struct in_addr *ip4 = NULL;
4037 struct in6_addr *ip6 = NULL;
4042 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
4043 pr = req->td->td_ucred->cr_prison;
4045 sx_slock(&allprison_lock);
4046 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
4047 #if defined(INET) || defined(INET6)
4050 mtx_lock(&cpr->pr_mtx);
4052 if (cpr->pr_ip4s > 0) {
4053 if (ip4s < cpr->pr_ip4s) {
4054 ip4s = cpr->pr_ip4s;
4055 mtx_unlock(&cpr->pr_mtx);
4056 ip4 = realloc(ip4, ip4s *
4057 sizeof(struct in_addr), M_TEMP, M_WAITOK);
4060 bcopy(cpr->pr_ip4, ip4,
4061 cpr->pr_ip4s * sizeof(struct in_addr));
4065 if (cpr->pr_ip6s > 0) {
4066 if (ip6s < cpr->pr_ip6s) {
4067 ip6s = cpr->pr_ip6s;
4068 mtx_unlock(&cpr->pr_mtx);
4069 ip6 = realloc(ip6, ip6s *
4070 sizeof(struct in6_addr), M_TEMP, M_WAITOK);
4073 bcopy(cpr->pr_ip6, ip6,
4074 cpr->pr_ip6s * sizeof(struct in6_addr));
4077 if (cpr->pr_ref == 0) {
4078 mtx_unlock(&cpr->pr_mtx);
4081 bzero(xp, sizeof(*xp));
4082 xp->pr_version = XPRISON_VERSION;
4083 xp->pr_id = cpr->pr_id;
4084 xp->pr_state = cpr->pr_uref > 0
4085 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
4086 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
4087 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
4088 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
4090 xp->pr_ip4s = cpr->pr_ip4s;
4093 xp->pr_ip6s = cpr->pr_ip6s;
4095 mtx_unlock(&cpr->pr_mtx);
4096 error = SYSCTL_OUT(req, xp, sizeof(*xp));
4100 if (xp->pr_ip4s > 0) {
4101 error = SYSCTL_OUT(req, ip4,
4102 xp->pr_ip4s * sizeof(struct in_addr));
4108 if (xp->pr_ip6s > 0) {
4109 error = SYSCTL_OUT(req, ip6,
4110 xp->pr_ip6s * sizeof(struct in6_addr));
4116 sx_sunlock(&allprison_lock);
4127 SYSCTL_OID(_security_jail, OID_AUTO, list,
4128 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4129 sysctl_jail_list, "S", "List of active jails");
4132 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
4136 injail = jailed(req->td->td_ucred);
4137 error = SYSCTL_OUT(req, &injail, sizeof(injail));
4142 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
4143 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4144 sysctl_jail_jailed, "I", "Process in jail?");
4147 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
4149 int error, havevnet;
4151 struct ucred *cred = req->td->td_ucred;
4153 havevnet = jailed(cred) && prison_owns_vnet(cred);
4157 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
4162 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
4163 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4164 sysctl_jail_vnet, "I", "Jail owns VNET?");
4166 #if defined(INET) || defined(INET6)
4167 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
4168 &jail_max_af_ips, 0,
4169 "Number of IP addresses a jail may have at most per address family");
4173 * Default parameters for jail(2) compatability. For historical reasons,
4174 * the sysctl names have varying similarity to the parameter names. Prisons
4175 * just see their own parameters, and can't change them.
4178 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
4181 int allow, error, i;
4183 pr = req->td->td_ucred->cr_prison;
4184 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
4186 /* Get the current flag value, and convert it to a boolean. */
4187 i = (allow & arg2) ? 1 : 0;
4190 error = sysctl_handle_int(oidp, &i, 0, req);
4191 if (error || !req->newptr)
4197 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
4200 mtx_lock(&prison0.pr_mtx);
4201 jail_default_allow = (jail_default_allow & ~arg2) | i;
4202 mtx_unlock(&prison0.pr_mtx);
4206 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
4207 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4208 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
4209 "Processes in jail can set their hostnames");
4210 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
4211 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4212 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
4213 "Processes in jail are limited to creating UNIX/IP/route sockets only");
4214 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
4215 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4216 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
4217 "Processes in jail can use System V IPC primitives");
4218 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
4219 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4220 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
4221 "Prison root can create raw sockets");
4222 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
4223 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4224 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
4225 "Processes in jail can alter system file flags");
4226 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
4227 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4228 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
4229 "Processes in jail can mount/unmount jail-friendly file systems");
4230 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed,
4231 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4232 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I",
4233 "Processes in jail can mount the devfs file system");
4234 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed,
4235 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4236 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I",
4237 "Processes in jail can mount the nullfs file system");
4238 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed,
4239 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4240 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I",
4241 "Processes in jail can mount the procfs file system");
4242 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed,
4243 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4244 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I",
4245 "Processes in jail can mount the tmpfs file system");
4246 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed,
4247 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4248 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I",
4249 "Processes in jail can mount the zfs file system");
4252 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
4257 pr = req->td->td_ucred->cr_prison;
4258 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
4259 error = sysctl_handle_int(oidp, &level, 0, req);
4260 if (error || !req->newptr)
4262 *(int *)arg1 = level;
4266 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
4267 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4268 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
4269 sysctl_jail_default_level, "I",
4270 "Processes in jail cannot see all mounted file systems");
4272 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
4273 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
4274 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
4275 sysctl_jail_default_level, "I",
4276 "Ruleset for the devfs filesystem in jail");
4279 * Nodes to describe jail parameters. Maximum length of string parameters
4280 * is returned in the string itself, and the other parameters exist merely
4281 * to make themselves and their types known.
4283 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0,
4287 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
4294 switch (oidp->oid_kind & CTLTYPE)
4300 if (!(req->flags & SCTL_MASK32))
4302 return (SYSCTL_OUT(req, &l, sizeof(l)));
4306 return (SYSCTL_OUT(req, &i, sizeof(i)));
4307 case CTLTYPE_STRING:
4308 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
4310 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
4311 case CTLTYPE_STRUCT:
4313 return (SYSCTL_OUT(req, &s, sizeof(s)));
4318 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
4319 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
4320 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
4321 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
4322 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
4323 "I", "Jail secure level");
4324 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
4325 "I", "Jail cannot see all mounted file systems");
4326 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
4327 "I", "Ruleset for in-jail devfs mounts");
4328 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
4329 "B", "Jail persistence");
4331 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
4332 "E,jailsys", "Virtual network stack");
4334 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
4335 "B", "Jail is in the process of shutting down");
4337 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
4338 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
4339 "I", "Current number of child jails");
4340 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
4341 "I", "Maximum number of child jails");
4343 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
4344 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
4346 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
4347 "Jail NIS domainname");
4348 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
4350 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
4351 "LU", "Jail host ID");
4353 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
4354 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
4357 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
4358 "Jail IPv4 address virtualization");
4359 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
4360 "S,in_addr,a", "Jail IPv4 addresses");
4361 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4362 "B", "Do (not) use IPv4 source address selection rather than the "
4363 "primary jail IPv4 address.");
4366 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
4367 "Jail IPv6 address virtualization");
4368 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
4369 "S,in6_addr,a", "Jail IPv6 addresses");
4370 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4371 "B", "Do (not) use IPv6 source address selection rather than the "
4372 "primary jail IPv6 address.");
4375 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
4376 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
4377 "B", "Jail may set hostname");
4378 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
4379 "B", "Jail may use SYSV IPC");
4380 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
4381 "B", "Jail may create raw sockets");
4382 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
4383 "B", "Jail may alter system file flags");
4384 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
4385 "B", "Jail may set file quotas");
4386 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
4387 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
4389 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
4390 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
4391 "B", "Jail may mount/unmount jail-friendly file systems in general");
4392 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW,
4393 "B", "Jail may mount the devfs file system");
4394 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW,
4395 "B", "Jail may mount the nullfs file system");
4396 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW,
4397 "B", "Jail may mount the procfs file system");
4398 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW,
4399 "B", "Jail may mount the tmpfs file system");
4400 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW,
4401 "B", "Jail may mount the zfs file system");
4404 prison_racct_foreach(void (*callback)(struct racct *racct,
4405 void *arg2, void *arg3), void *arg2, void *arg3)
4407 struct prison_racct *prr;
4409 sx_slock(&allprison_lock);
4410 LIST_FOREACH(prr, &allprison_racct, prr_next)
4411 (callback)(prr->prr_racct, arg2, arg3);
4412 sx_sunlock(&allprison_lock);
4415 static struct prison_racct *
4416 prison_racct_find_locked(const char *name)
4418 struct prison_racct *prr;
4420 sx_assert(&allprison_lock, SA_XLOCKED);
4422 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
4425 LIST_FOREACH(prr, &allprison_racct, prr_next) {
4426 if (strcmp(name, prr->prr_name) != 0)
4429 /* Found prison_racct with a matching name? */
4430 prison_racct_hold(prr);
4434 /* Add new prison_racct. */
4435 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
4436 racct_create(&prr->prr_racct);
4438 strcpy(prr->prr_name, name);
4439 refcount_init(&prr->prr_refcount, 1);
4440 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
4445 struct prison_racct *
4446 prison_racct_find(const char *name)
4448 struct prison_racct *prr;
4450 sx_xlock(&allprison_lock);
4451 prr = prison_racct_find_locked(name);
4452 sx_xunlock(&allprison_lock);
4457 prison_racct_hold(struct prison_racct *prr)
4460 refcount_acquire(&prr->prr_refcount);
4464 prison_racct_free_locked(struct prison_racct *prr)
4467 sx_assert(&allprison_lock, SA_XLOCKED);
4469 if (refcount_release(&prr->prr_refcount)) {
4470 racct_destroy(&prr->prr_racct);
4471 LIST_REMOVE(prr, prr_next);
4472 free(prr, M_PRISON_RACCT);
4477 prison_racct_free(struct prison_racct *prr)
4481 sx_assert(&allprison_lock, SA_UNLOCKED);
4483 old = prr->prr_refcount;
4484 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1))
4487 sx_xlock(&allprison_lock);
4488 prison_racct_free_locked(prr);
4489 sx_xunlock(&allprison_lock);
4494 prison_racct_attach(struct prison *pr)
4496 struct prison_racct *prr;
4498 sx_assert(&allprison_lock, SA_XLOCKED);
4500 prr = prison_racct_find_locked(pr->pr_name);
4501 KASSERT(prr != NULL, ("cannot find prison_racct"));
4503 pr->pr_prison_racct = prr;
4507 * Handle jail renaming. From the racct point of view, renaming means
4508 * moving from one prison_racct to another.
4511 prison_racct_modify(struct prison *pr)
4515 struct prison_racct *oldprr;
4517 sx_slock(&allproc_lock);
4518 sx_xlock(&allprison_lock);
4520 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
4521 sx_xunlock(&allprison_lock);
4522 sx_sunlock(&allproc_lock);
4526 oldprr = pr->pr_prison_racct;
4527 pr->pr_prison_racct = NULL;
4529 prison_racct_attach(pr);
4532 * Move resource utilisation records.
4534 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
4537 * Force rctl to reattach rules to processes.
4539 FOREACH_PROC_IN_SYSTEM(p) {
4541 cred = crhold(p->p_ucred);
4543 racct_proc_ucred_changed(p, cred, cred);
4547 sx_sunlock(&allproc_lock);
4548 prison_racct_free_locked(oldprr);
4549 sx_xunlock(&allprison_lock);
4553 prison_racct_detach(struct prison *pr)
4556 sx_assert(&allprison_lock, SA_UNLOCKED);
4558 if (pr->pr_prison_racct == NULL)
4560 prison_racct_free(pr->pr_prison_racct);
4561 pr->pr_prison_racct = NULL;
4568 db_show_prison(struct prison *pr)
4571 #if defined(INET) || defined(INET6)
4576 char ip6buf[INET6_ADDRSTRLEN];
4579 db_printf("prison %p:\n", pr);
4580 db_printf(" jid = %d\n", pr->pr_id);
4581 db_printf(" name = %s\n", pr->pr_name);
4582 db_printf(" parent = %p\n", pr->pr_parent);
4583 db_printf(" ref = %d\n", pr->pr_ref);
4584 db_printf(" uref = %d\n", pr->pr_uref);
4585 db_printf(" path = %s\n", pr->pr_path);
4586 db_printf(" cpuset = %d\n", pr->pr_cpuset
4587 ? pr->pr_cpuset->cs_id : -1);
4589 db_printf(" vnet = %p\n", pr->pr_vnet);
4591 db_printf(" root = %p\n", pr->pr_root);
4592 db_printf(" securelevel = %d\n", pr->pr_securelevel);
4593 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
4594 db_printf(" children.max = %d\n", pr->pr_childmax);
4595 db_printf(" children.cur = %d\n", pr->pr_childcount);
4596 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
4597 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
4598 db_printf(" flags = 0x%x", pr->pr_flags);
4599 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
4601 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi)))
4602 db_printf(" %s", pr_flag_names[fi]);
4603 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
4605 jsf = pr->pr_flags &
4606 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
4607 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name,
4608 pr_flag_jailsys[fi].disable &&
4609 (jsf == pr_flag_jailsys[fi].disable) ? "disable"
4610 : (jsf == pr_flag_jailsys[fi].new) ? "new"
4613 db_printf(" allow = 0x%x", pr->pr_allow);
4614 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
4616 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi)))
4617 db_printf(" %s", pr_allow_names[fi]);
4619 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
4620 db_printf(" host.hostname = %s\n", pr->pr_hostname);
4621 db_printf(" host.domainname = %s\n", pr->pr_domainname);
4622 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
4623 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
4625 db_printf(" ip4s = %d\n", pr->pr_ip4s);
4626 for (ii = 0; ii < pr->pr_ip4s; ii++)
4627 db_printf(" %s %s\n",
4628 ii == 0 ? "ip4.addr =" : " ",
4629 inet_ntoa(pr->pr_ip4[ii]));
4632 db_printf(" ip6s = %d\n", pr->pr_ip6s);
4633 for (ii = 0; ii < pr->pr_ip6s; ii++)
4634 db_printf(" %s %s\n",
4635 ii == 0 ? "ip6.addr =" : " ",
4636 ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
4640 DB_SHOW_COMMAND(prison, db_show_prison_command)
4646 * Show all prisons in the list, and prison0 which is not
4649 db_show_prison(&prison0);
4650 if (!db_pager_quit) {
4651 TAILQ_FOREACH(pr, &allprison, pr_list) {
4663 /* Look for a prison with the ID and with references. */
4664 TAILQ_FOREACH(pr, &allprison, pr_list)
4665 if (pr->pr_id == addr && pr->pr_ref > 0)
4668 /* Look again, without requiring a reference. */
4669 TAILQ_FOREACH(pr, &allprison, pr_list)
4670 if (pr->pr_id == addr)
4673 /* Assume address points to a valid prison. */
4674 pr = (struct prison *)addr;