2 * Copyright (c) 1999 Poul-Henning Kamp.
3 * Copyright (c) 2008 Bjoern A. Zeeb.
4 * Copyright (c) 2009 James Gritton.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include "opt_compat.h"
35 #include "opt_inet6.h"
37 #include <sys/param.h>
38 #include <sys/types.h>
39 #include <sys/kernel.h>
40 #include <sys/systm.h>
41 #include <sys/errno.h>
42 #include <sys/sysproto.h>
43 #include <sys/malloc.h>
47 #include <sys/taskqueue.h>
48 #include <sys/fcntl.h>
51 #include <sys/mutex.h>
52 #include <sys/racct.h>
53 #include <sys/refcount.h>
55 #include <sys/sysent.h>
56 #include <sys/namei.h>
57 #include <sys/mount.h>
58 #include <sys/queue.h>
59 #include <sys/socket.h>
60 #include <sys/syscallsubr.h>
61 #include <sys/sysctl.h>
62 #include <sys/vnode.h>
67 #include <netinet/in.h>
72 #include <netinet6/in6_var.h>
76 #include <security/mac/mac_framework.h>
78 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000"
80 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
81 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures");
83 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */
86 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
88 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
92 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
94 #define _PR_IP_SADDRSEL 0
98 /* prison0 describes what is "real" about the system. */
99 struct prison prison0 = {
105 .pr_securelevel = -1,
107 .pr_childmax = JAIL_MAX,
108 .pr_hostuuid = DEFAULT_HOSTUUID,
109 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
111 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
113 .pr_flags = PR_HOST|_PR_IP_SADDRSEL,
115 .pr_allow = PR_ALLOW_ALL,
117 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
119 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */
120 struct sx allprison_lock;
121 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
122 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
123 LIST_HEAD(, prison_racct) allprison_racct;
126 static int do_jail_attach(struct thread *td, struct prison *pr);
127 static void prison_complete(void *context, int pending);
128 static void prison_deref(struct prison *pr, int flags);
129 static char *prison_path(struct prison *pr1, struct prison *pr2);
130 static void prison_remove_one(struct prison *pr);
132 static void prison_racct_attach(struct prison *pr);
133 static void prison_racct_modify(struct prison *pr);
134 static void prison_racct_detach(struct prison *pr);
137 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia);
138 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4);
141 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6);
142 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6);
145 /* Flags for prison_deref */
146 #define PD_DEREF 0x01
147 #define PD_DEUREF 0x02
148 #define PD_LOCKED 0x04
149 #define PD_LIST_SLOCKED 0x08
150 #define PD_LIST_XLOCKED 0x10
153 * Parameter names corresponding to PR_* flag values. Size values are for kvm
154 * as we cannot figure out the size of a sparse array, or an array without a
157 static char *pr_flag_names[] = {
160 [7] = "ip4.saddrsel",
163 [8] = "ip6.saddrsel",
166 const size_t pr_flag_names_size = sizeof(pr_flag_names);
168 static char *pr_flag_nonames[] = {
171 [7] = "ip4.nosaddrsel",
174 [8] = "ip6.nosaddrsel",
177 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames);
179 struct jailsys_flags {
183 } pr_flag_jailsys[] = {
184 { "host", 0, PR_HOST },
186 { "vnet", 0, PR_VNET },
189 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER },
192 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER },
195 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
197 static char *pr_allow_names[] = {
198 "allow.set_hostname",
206 "allow.mount.nullfs",
208 "allow.mount.procfs",
210 "allow.mount.fdescfs",
211 "allow.mount.linprocfs",
212 "allow.mount.linsysfs",
214 const size_t pr_allow_names_size = sizeof(pr_allow_names);
216 static char *pr_allow_nonames[] = {
217 "allow.noset_hostname",
219 "allow.noraw_sockets",
224 "allow.mount.nodevfs",
225 "allow.mount.nonullfs",
227 "allow.mount.noprocfs",
228 "allow.mount.notmpfs",
229 "allow.mount.nofdescfs",
230 "allow.mount.nolinprocfs",
231 "allow.mount.nolinsysfs",
233 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames);
235 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME
236 #define JAIL_DEFAULT_ENFORCE_STATFS 2
237 #define JAIL_DEFAULT_DEVFS_RSNUM 0
238 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
239 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
240 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
241 #if defined(INET) || defined(INET6)
242 static unsigned jail_max_af_ips = 255;
246 * Initialize the parts of prison0 that can't be static-initialized with
247 * constants. This is called from proc0_init() after creating thread0 cpuset.
253 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset);
254 prison0.pr_osreldate = osreldate;
255 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease));
260 qcmp_v4(const void *ip1, const void *ip2)
265 * We need to compare in HBO here to get the list sorted as expected
266 * by the result of the code. Sorting NBO addresses gives you
267 * interesting results. If you do not understand, do not try.
269 iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
270 iab = ntohl(((const struct in_addr *)ip2)->s_addr);
273 * Do not simply return the difference of the two numbers, the int is
287 qcmp_v6(const void *ip1, const void *ip2)
289 const struct in6_addr *ia6a, *ia6b;
292 ia6a = (const struct in6_addr *)ip1;
293 ia6b = (const struct in6_addr *)ip2;
296 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
297 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
299 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
312 sys_jail(struct thread *td, struct jail_args *uap)
318 error = copyin(uap->jail, &version, sizeof(uint32_t));
327 /* FreeBSD single IPv4 jails. */
328 bzero(&j, sizeof(struct jail));
329 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
332 j.version = j0.version;
334 j.hostname = j0.hostname;
335 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */
341 * Version 1 was used by multi-IPv4 jail implementations
342 * that never made it into the official kernel.
346 case 2: /* JAIL_API_VERSION */
347 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
348 error = copyin(uap->jail, &j, sizeof(struct jail));
354 /* Sci-Fi jails are not supported, sorry. */
357 return (kern_jail(td, &j));
361 kern_jail(struct thread *td, struct jail *j)
363 struct iovec optiov[2 * (4
364 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0])
373 char *u_path, *u_hostname, *u_name;
376 struct in_addr *u_ip4;
379 struct in6_addr *u_ip6;
382 int error, enforce_statfs, fi;
384 bzero(&optiov, sizeof(optiov));
385 opt.uio_iov = optiov;
389 opt.uio_segflg = UIO_SYSSPACE;
390 opt.uio_rw = UIO_READ;
393 /* Set permissions for top-level jails from sysctls. */
394 if (!jailed(td->td_ucred)) {
395 for (fi = 0; fi < sizeof(pr_allow_names) /
396 sizeof(pr_allow_names[0]); fi++) {
397 optiov[opt.uio_iovcnt].iov_base =
398 (jail_default_allow & (1 << fi))
399 ? pr_allow_names[fi] : pr_allow_nonames[fi];
400 optiov[opt.uio_iovcnt].iov_len =
401 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
404 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
405 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
407 enforce_statfs = jail_default_enforce_statfs;
408 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
409 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
413 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
415 ip4s = (j->version == 0) ? 1 : j->ip4s;
416 if (ip4s > jail_max_af_ips)
418 tmplen += ip4s * sizeof(struct in_addr);
424 if (j->ip6s > jail_max_af_ips)
426 tmplen += j->ip6s * sizeof(struct in6_addr);
431 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
432 u_hostname = u_path + MAXPATHLEN;
433 u_name = u_hostname + MAXHOSTNAMELEN;
435 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
439 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
441 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
444 optiov[opt.uio_iovcnt].iov_base = "path";
445 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
447 optiov[opt.uio_iovcnt].iov_base = u_path;
448 error = copyinstr(j->path, u_path, MAXPATHLEN,
449 &optiov[opt.uio_iovcnt].iov_len);
451 free(u_path, M_TEMP);
455 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
456 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
458 optiov[opt.uio_iovcnt].iov_base = u_hostname;
459 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
460 &optiov[opt.uio_iovcnt].iov_len);
462 free(u_path, M_TEMP);
466 if (j->jailname != NULL) {
467 optiov[opt.uio_iovcnt].iov_base = "name";
468 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
470 optiov[opt.uio_iovcnt].iov_base = u_name;
471 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
472 &optiov[opt.uio_iovcnt].iov_len);
474 free(u_path, M_TEMP);
480 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
481 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
483 optiov[opt.uio_iovcnt].iov_base = u_ip4;
484 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
486 u_ip4->s_addr = j->ip4s;
488 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
490 free(u_path, M_TEMP);
497 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
498 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
500 optiov[opt.uio_iovcnt].iov_base = u_ip6;
501 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
502 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
504 free(u_path, M_TEMP);
509 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]),
510 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
511 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
512 free(u_path, M_TEMP);
518 * struct jail_set_args {
519 * struct iovec *iovp;
520 * unsigned int iovcnt;
525 sys_jail_set(struct thread *td, struct jail_set_args *uap)
530 /* Check that we have an even number of iovecs. */
534 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
537 error = kern_jail_set(td, auio, uap->flags);
543 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
550 struct in6_addr *ip6;
553 struct vfsoptlist *opts;
554 struct prison *pr, *deadpr, *mypr, *ppr, *tpr;
556 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
557 char *g_path, *osrelstr;
558 #if defined(INET) || defined(INET6)
563 size_t namelen, onamelen, pnamelen;
564 int born, created, cuflags, descend, enforce;
565 int error, errmsg_len, errmsg_pos;
566 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
567 int fi, jid, jsys, len, level;
568 int childmax, osreldt, rsnum, slevel;
569 int fullpath_disabled;
570 #if defined(INET) || defined(INET6)
579 uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
583 error = priv_check(td, PRIV_JAIL_SET);
584 if (!error && (flags & JAIL_ATTACH))
585 error = priv_check(td, PRIV_JAIL_ATTACH);
588 mypr = td->td_ucred->cr_prison;
589 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
591 if (flags & ~JAIL_SET_MASK)
595 * Check all the parameters before committing to anything. Not all
596 * errors can be caught early, but we may as well try. Also, this
597 * takes care of some expensive stuff (path lookup) before getting
598 * the allprison lock.
600 * XXX Jails are not filesystems, and jail parameters are not mount
601 * options. But it makes more sense to re-use the vfsopt code
602 * than duplicate it under a different name.
604 error = vfs_buildopts(optuio, &opts);
615 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
618 vfs_opterror(opts, "no valid operation (create or update)");
622 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
628 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
637 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
645 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
650 else if (enforce < 0 || enforce > 2) {
656 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
664 pr_flags = ch_flags = 0;
665 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
667 if (pr_flag_names[fi] == NULL)
669 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi);
670 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi);
672 ch_flags |= pr_flags;
673 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
675 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys,
682 case JAIL_SYS_DISABLE:
683 if (!pr_flag_jailsys[fi].disable) {
687 pr_flags |= pr_flag_jailsys[fi].disable;
690 pr_flags |= pr_flag_jailsys[fi].new;
692 case JAIL_SYS_INHERIT:
699 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable;
701 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE
702 && !(pr_flags & PR_PERSIST)) {
704 vfs_opterror(opts, "new jail must persist or attach");
708 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
710 vfs_opterror(opts, "vnet cannot be changed after creation");
715 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
717 vfs_opterror(opts, "ip4 cannot be changed after creation");
722 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
724 vfs_opterror(opts, "ip6 cannot be changed after creation");
729 pr_allow = ch_allow = 0;
730 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
732 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi);
733 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi);
735 ch_allow |= pr_allow;
737 error = vfs_getopt(opts, "name", (void **)&name, &len);
743 if (len == 0 || name[len - 1] != '\0') {
747 if (len > MAXHOSTNAMELEN) {
748 error = ENAMETOOLONG;
753 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
761 if (len == 0 || host[len - 1] != '\0') {
765 if (len > MAXHOSTNAMELEN) {
766 error = ENAMETOOLONG;
771 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
779 if (len == 0 || domain[len - 1] != '\0') {
783 if (len > MAXHOSTNAMELEN) {
784 error = ENAMETOOLONG;
789 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
797 if (len == 0 || uuid[len - 1] != '\0') {
801 if (len > HOSTUUIDLEN) {
802 error = ENAMETOOLONG;
807 #ifdef COMPAT_FREEBSD32
808 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
811 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
815 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
827 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
832 else if (ip4s & (sizeof(*ip4) - 1)) {
836 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE;
838 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE;
840 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER;
841 ip4s /= sizeof(*ip4);
842 if (ip4s > jail_max_af_ips) {
844 vfs_opterror(opts, "too many IPv4 addresses");
847 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
848 bcopy(op, ip4, ip4s * sizeof(*ip4));
850 * IP addresses are all sorted but ip[0] to preserve
851 * the primary IP address as given from userland.
852 * This special IP is used for unbound outgoing
853 * connections as well for "loopback" traffic in case
854 * source address selection cannot find any more fitting
855 * address to connect from.
858 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4);
860 * Check for duplicate addresses and do some simple
861 * zero and broadcast checks. If users give other bogus
862 * addresses it is their problem.
864 * We do not have to care about byte order for these
865 * checks so we will do them in NBO.
867 for (ii = 0; ii < ip4s; ii++) {
868 if (ip4[ii].s_addr == INADDR_ANY ||
869 ip4[ii].s_addr == INADDR_BROADCAST) {
874 (ip4[0].s_addr == ip4[ii+1].s_addr ||
875 ip4[ii].s_addr == ip4[ii+1].s_addr)) {
885 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
890 else if (ip6s & (sizeof(*ip6) - 1)) {
894 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE;
896 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE;
898 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER;
899 ip6s /= sizeof(*ip6);
900 if (ip6s > jail_max_af_ips) {
902 vfs_opterror(opts, "too many IPv6 addresses");
905 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
906 bcopy(op, ip6, ip6s * sizeof(*ip6));
908 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6);
909 for (ii = 0; ii < ip6s; ii++) {
910 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
915 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
916 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
926 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
927 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
930 "vnet jails cannot have IP address restrictions");
935 fullpath_disabled = 0;
937 error = vfs_getopt(opts, "path", (void **)&path, &len);
943 if (flags & JAIL_UPDATE) {
946 "path cannot be changed after creation");
949 if (len == 0 || path[len - 1] != '\0') {
953 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
959 NDFREE(&nd, NDF_ONLY_PNBUF);
960 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
961 strlcpy(g_path, path, MAXPATHLEN);
962 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
965 else if (error == ENODEV) {
966 /* proceed if sysctl debug.disablefullpath == 1 */
967 fullpath_disabled = 1;
968 if (len < 2 || (len == 2 && path[0] == '/'))
971 /* exit on other errors */
974 if (root->v_type != VDIR) {
980 if (fullpath_disabled) {
981 /* Leave room for a real-root full pathname. */
982 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/")
983 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) {
984 error = ENAMETOOLONG;
990 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len);
996 if (flags & JAIL_UPDATE) {
999 "osrelease cannot be changed after creation");
1002 if (len == 0 || len >= OSRELEASELEN) {
1005 "osrelease string must be 1-%d bytes long",
1011 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt));
1012 if (error == ENOENT)
1014 else if (error != 0)
1017 if (flags & JAIL_UPDATE) {
1020 "osreldate cannot be changed after creation");
1025 vfs_opterror(opts, "osreldate cannot be 0");
1031 * Find the specified jail, or at least its parent.
1032 * This abuses the file error codes ENOENT and EEXIST.
1036 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
1037 namelc = strrchr(name, '.');
1038 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
1042 sx_xlock(&allprison_lock);
1045 * See if a requested jid already exists. There is an
1046 * information leak here if the jid exists but is not within
1047 * the caller's jail hierarchy. Jail creators will get EEXIST
1048 * even though they cannot see the jail, and CREATE | UPDATE
1049 * will return ENOENT which is not normally a valid error.
1053 vfs_opterror(opts, "negative jid");
1054 goto done_unlock_list;
1056 pr = prison_find(jid);
1058 ppr = pr->pr_parent;
1059 /* Create: jid must not exist. */
1060 if (cuflags == JAIL_CREATE) {
1061 mtx_unlock(&pr->pr_mtx);
1063 vfs_opterror(opts, "jail %d already exists",
1065 goto done_unlock_list;
1067 if (!prison_ischild(mypr, pr)) {
1068 mtx_unlock(&pr->pr_mtx);
1070 } else if (pr->pr_uref == 0) {
1071 if (!(flags & JAIL_DYING)) {
1072 mtx_unlock(&pr->pr_mtx);
1074 vfs_opterror(opts, "jail %d is dying",
1076 goto done_unlock_list;
1077 } else if ((flags & JAIL_ATTACH) ||
1078 (pr_flags & PR_PERSIST)) {
1080 * A dying jail might be resurrected
1081 * (via attach or persist), but first
1082 * it must determine if another jail
1083 * has claimed its name. Accomplish
1084 * this by implicitly re-setting the
1088 name = prison_name(mypr, pr);
1093 /* Update: jid must exist. */
1094 if (cuflags == JAIL_UPDATE) {
1096 vfs_opterror(opts, "jail %d not found", jid);
1097 goto done_unlock_list;
1102 * If the caller provided a name, look for a jail by that name.
1103 * This has different semantics for creates and updates keyed by jid
1104 * (where the name must not already exist in a different jail),
1105 * and updates keyed by the name itself (where the name must exist
1106 * because that is the jail being updated).
1110 namelc = strrchr(name, '.');
1115 * This is a hierarchical name. Split it into the
1116 * parent and child names, and make sure the parent
1117 * exists or matches an already found jail.
1120 if (strncmp(name, ppr->pr_name, namelc - name)
1121 || ppr->pr_name[namelc - name] != '\0') {
1122 mtx_unlock(&pr->pr_mtx);
1125 "cannot change jail's parent");
1126 goto done_unlock_list;
1130 ppr = prison_find_name(mypr, name);
1134 "jail \"%s\" not found", name);
1135 goto done_unlock_list;
1137 mtx_unlock(&ppr->pr_mtx);
1142 if (namelc[0] != '\0') {
1144 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1147 FOREACH_PRISON_CHILD(ppr, tpr) {
1148 if (tpr != pr && tpr->pr_ref > 0 &&
1149 !strcmp(tpr->pr_name + pnamelen, namelc)) {
1151 cuflags != JAIL_CREATE) {
1152 mtx_lock(&tpr->pr_mtx);
1153 if (tpr->pr_ref > 0) {
1158 if (tpr->pr_uref > 0) {
1164 mtx_unlock(&tpr->pr_mtx);
1165 } else if (tpr->pr_uref > 0) {
1167 * Create, or update(jid):
1168 * name must not exist in an
1169 * active sibling jail.
1173 mtx_unlock(&pr->pr_mtx);
1175 "jail \"%s\" already exists",
1177 goto done_unlock_list;
1181 /* If no active jail is found, use a dying one. */
1182 if (deadpr != NULL && pr == NULL) {
1183 if (flags & JAIL_DYING) {
1184 mtx_lock(&deadpr->pr_mtx);
1185 if (deadpr->pr_ref == 0) {
1186 mtx_unlock(&deadpr->pr_mtx);
1190 } else if (cuflags == JAIL_UPDATE) {
1193 "jail \"%s\" is dying", name);
1194 goto done_unlock_list;
1197 /* Update: name must exist if no jid. */
1198 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1200 vfs_opterror(opts, "jail \"%s\" not found",
1202 goto done_unlock_list;
1206 /* Update: must provide a jid or name. */
1207 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1209 vfs_opterror(opts, "update specified no jail");
1210 goto done_unlock_list;
1213 /* If there's no prison to update, create a new one and link it in. */
1215 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1216 if (tpr->pr_childcount >= tpr->pr_childmax) {
1218 vfs_opterror(opts, "prison limit exceeded");
1219 goto done_unlock_list;
1222 mtx_lock(&ppr->pr_mtx);
1223 if (ppr->pr_ref == 0) {
1224 mtx_unlock(&ppr->pr_mtx);
1226 vfs_opterror(opts, "jail \"%s\" not found",
1227 prison_name(mypr, ppr));
1228 goto done_unlock_list;
1232 mtx_unlock(&ppr->pr_mtx);
1233 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1235 /* Find the next free jid. */
1238 if (jid == JAIL_MAX)
1240 TAILQ_FOREACH(tpr, &allprison, pr_list) {
1241 if (tpr->pr_id < jid)
1243 if (tpr->pr_id > jid || tpr->pr_ref == 0) {
1244 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1247 if (jid == lastprid) {
1250 "no available jail IDs");
1252 prison_deref(ppr, PD_DEREF |
1253 PD_DEUREF | PD_LIST_XLOCKED);
1262 * The jail already has a jid (that did not yet exist),
1263 * so just find where to insert it.
1265 TAILQ_FOREACH(tpr, &allprison, pr_list)
1266 if (tpr->pr_id >= jid) {
1267 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1272 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1273 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1274 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1275 tpr->pr_childcount++;
1277 pr->pr_parent = ppr;
1280 /* Set some default values, and inherit some from the parent. */
1285 root = mypr->pr_root;
1288 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1289 pr->pr_flags |= PR_HOST;
1290 #if defined(INET) || defined(INET6)
1292 if (!(pr_flags & PR_VNET))
1296 if (!(ch_flags & PR_IP4_USER))
1298 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE;
1299 else if (!(pr_flags & PR_IP4_USER)) {
1300 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1301 if (ppr->pr_ip4 != NULL) {
1302 pr->pr_ip4s = ppr->pr_ip4s;
1303 pr->pr_ip4 = malloc(pr->pr_ip4s *
1304 sizeof(struct in_addr), M_PRISON,
1306 bcopy(ppr->pr_ip4, pr->pr_ip4,
1307 pr->pr_ip4s * sizeof(*pr->pr_ip4));
1312 if (!(ch_flags & PR_IP6_USER))
1314 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE;
1315 else if (!(pr_flags & PR_IP6_USER)) {
1316 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1317 if (ppr->pr_ip6 != NULL) {
1318 pr->pr_ip6s = ppr->pr_ip6s;
1319 pr->pr_ip6 = malloc(pr->pr_ip6s *
1320 sizeof(struct in6_addr), M_PRISON,
1322 bcopy(ppr->pr_ip6, pr->pr_ip6,
1323 pr->pr_ip6s * sizeof(*pr->pr_ip6));
1329 /* Source address selection is always on by default. */
1330 pr->pr_flags |= _PR_IP_SADDRSEL;
1332 pr->pr_securelevel = ppr->pr_securelevel;
1333 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1334 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
1335 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
1337 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate;
1338 if (osrelstr == NULL)
1339 strcpy(pr->pr_osrelease, ppr->pr_osrelease);
1341 strcpy(pr->pr_osrelease, osrelstr);
1343 LIST_INIT(&pr->pr_children);
1344 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1345 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
1348 /* Allocate a new vnet if specified. */
1349 pr->pr_vnet = (pr_flags & PR_VNET)
1350 ? vnet_alloc() : ppr->pr_vnet;
1353 * Allocate a dedicated cpuset for each jail.
1354 * Unlike other initial settings, this may return an erorr.
1356 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1358 prison_deref(pr, PD_LIST_XLOCKED);
1362 mtx_lock(&pr->pr_mtx);
1364 * New prisons do not yet have a reference, because we do not
1365 * want others to see the incomplete prison once the
1366 * allprison_lock is downgraded.
1371 * Grab a reference for existing prisons, to ensure they
1372 * continue to exist for the duration of the call.
1375 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1376 if ((pr->pr_flags & PR_VNET) &&
1377 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1380 "vnet jails cannot have IP address restrictions");
1381 goto done_deref_locked;
1385 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1388 "ip4 cannot be changed after creation");
1389 goto done_deref_locked;
1393 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1396 "ip6 cannot be changed after creation");
1397 goto done_deref_locked;
1402 /* Do final error checking before setting anything. */
1404 if (slevel < ppr->pr_securelevel) {
1406 goto done_deref_locked;
1410 if (childmax >= ppr->pr_childmax) {
1412 goto done_deref_locked;
1416 if (enforce < ppr->pr_enforce_statfs) {
1418 goto done_deref_locked;
1423 * devfs_rsnum is a uint16_t
1425 if (rsnum < 0 || rsnum > 65535) {
1427 goto done_deref_locked;
1430 * Nested jails always inherit parent's devfs ruleset
1432 if (jailed(td->td_ucred)) {
1433 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
1435 goto done_deref_locked;
1437 rsnum = ppr->pr_devfs_rsnum;
1442 if (ppr->pr_flags & PR_IP4) {
1444 * Make sure the new set of IP addresses is a
1445 * subset of the parent's list. Don't worry
1446 * about the parent being unlocked, as any
1447 * setting is done with allprison_lock held.
1449 for (ij = 0; ij < ppr->pr_ip4s; ij++)
1450 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
1452 if (ij == ppr->pr_ip4s) {
1454 goto done_deref_locked;
1457 for (ii = ij = 1; ii < ip4s; ii++) {
1458 if (ip4[ii].s_addr ==
1459 ppr->pr_ip4[0].s_addr)
1461 for (; ij < ppr->pr_ip4s; ij++)
1462 if (ip4[ii].s_addr ==
1463 ppr->pr_ip4[ij].s_addr)
1465 if (ij == ppr->pr_ip4s)
1468 if (ij == ppr->pr_ip4s) {
1470 goto done_deref_locked;
1475 * Check for conflicting IP addresses. We permit them
1476 * if there is no more than one IP on each jail. If
1477 * there is a duplicate on a jail with more than one
1478 * IP stop checking and return error.
1482 for (; tppr != &prison0; tppr = tppr->pr_parent)
1483 if (tppr->pr_flags & PR_VNET)
1486 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1489 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1491 tpr->pr_uref == 0) {
1495 if (!(tpr->pr_flags & PR_IP4_USER))
1498 if (tpr->pr_ip4 == NULL ||
1499 (ip4s == 1 && tpr->pr_ip4s == 1))
1501 for (ii = 0; ii < ip4s; ii++) {
1502 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) {
1505 "IPv4 addresses clash");
1506 goto done_deref_locked;
1514 if (ppr->pr_flags & PR_IP6) {
1516 * Make sure the new set of IP addresses is a
1517 * subset of the parent's list.
1519 for (ij = 0; ij < ppr->pr_ip6s; ij++)
1520 if (IN6_ARE_ADDR_EQUAL(&ip6[0],
1523 if (ij == ppr->pr_ip6s) {
1525 goto done_deref_locked;
1528 for (ii = ij = 1; ii < ip6s; ii++) {
1529 if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
1532 for (; ij < ppr->pr_ip6s; ij++)
1533 if (IN6_ARE_ADDR_EQUAL(
1534 &ip6[ii], &ppr->pr_ip6[ij]))
1536 if (ij == ppr->pr_ip6s)
1539 if (ij == ppr->pr_ip6s) {
1541 goto done_deref_locked;
1545 /* Check for conflicting IP addresses. */
1548 for (; tppr != &prison0; tppr = tppr->pr_parent)
1549 if (tppr->pr_flags & PR_VNET)
1552 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1555 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1557 tpr->pr_uref == 0) {
1561 if (!(tpr->pr_flags & PR_IP6_USER))
1564 if (tpr->pr_ip6 == NULL ||
1565 (ip6s == 1 && tpr->pr_ip6s == 1))
1567 for (ii = 0; ii < ip6s; ii++) {
1568 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) {
1571 "IPv6 addresses clash");
1572 goto done_deref_locked;
1578 onamelen = namelen = 0;
1579 if (namelc != NULL) {
1580 /* Give a default name of the jid. Also allow the name to be
1581 * explicitly the jid - but not any other number, and only in
1582 * normal form (no leading zero/etc).
1584 if (namelc[0] == '\0')
1585 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid);
1586 else if ((strtoul(namelc, &p, 10) != jid ||
1587 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') {
1590 "name cannot be numeric (unless it is the jid)");
1591 goto done_deref_locked;
1594 * Make sure the name isn't too long for the prison or its
1597 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1598 onamelen = strlen(pr->pr_name + pnamelen);
1599 namelen = strlen(namelc);
1600 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) {
1601 error = ENAMETOOLONG;
1602 goto done_deref_locked;
1604 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1605 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
1606 sizeof(pr->pr_name)) {
1607 error = ENAMETOOLONG;
1608 goto done_deref_locked;
1612 if (pr_allow & ~ppr->pr_allow) {
1614 goto done_deref_locked;
1618 * Let modules check their parameters. This requires unlocking and
1619 * then re-locking the prison, but this is still a valid state as long
1620 * as allprison_lock remains xlocked.
1622 mtx_unlock(&pr->pr_mtx);
1623 error = osd_jail_call(pr, PR_METHOD_CHECK, opts);
1625 prison_deref(pr, created
1627 : PD_DEREF | PD_LIST_XLOCKED);
1630 mtx_lock(&pr->pr_mtx);
1632 /* At this point, all valid parameters should have been noted. */
1633 TAILQ_FOREACH(opt, opts, link) {
1634 if (!opt->seen && strcmp(opt->name, "errmsg")) {
1636 vfs_opterror(opts, "unknown parameter: %s", opt->name);
1637 goto done_deref_locked;
1641 /* Set the parameters of the prison. */
1644 if (pr_flags & PR_IP4_USER) {
1645 pr->pr_flags |= PR_IP4;
1646 free(pr->pr_ip4, M_PRISON);
1650 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1652 if (tpr->pr_flags & PR_VNET) {
1657 if (prison_restrict_ip4(tpr, NULL)) {
1666 if (pr_flags & PR_IP6_USER) {
1667 pr->pr_flags |= PR_IP6;
1668 free(pr->pr_ip6, M_PRISON);
1672 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1674 if (tpr->pr_flags & PR_VNET) {
1679 if (prison_restrict_ip6(tpr, NULL)) {
1687 pr->pr_securelevel = slevel;
1688 /* Set all child jails to be at least this level. */
1689 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1690 if (tpr->pr_securelevel < slevel)
1691 tpr->pr_securelevel = slevel;
1694 pr->pr_childmax = childmax;
1695 /* Set all child jails to under this limit. */
1696 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
1697 if (tpr->pr_childmax > childmax - level)
1698 tpr->pr_childmax = childmax > level
1699 ? childmax - level : 0;
1702 pr->pr_enforce_statfs = enforce;
1703 /* Pass this restriction on to the children. */
1704 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1705 if (tpr->pr_enforce_statfs < enforce)
1706 tpr->pr_enforce_statfs = enforce;
1709 pr->pr_devfs_rsnum = rsnum;
1710 /* Pass this restriction on to the children. */
1711 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1712 tpr->pr_devfs_rsnum = rsnum;
1714 if (namelc != NULL) {
1715 if (ppr == &prison0)
1716 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name));
1718 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
1719 ppr->pr_name, namelc);
1720 /* Change this component of child names. */
1721 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1722 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
1723 strlen(tpr->pr_name + onamelen) + 1);
1724 bcopy(pr->pr_name, tpr->pr_name, namelen);
1728 /* Try to keep a real-rooted full pathname. */
1729 if (fullpath_disabled && path[0] == '/' &&
1730 strcmp(mypr->pr_path, "/"))
1731 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s",
1732 mypr->pr_path, path);
1734 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
1737 if (PR_HOST & ch_flags & ~pr_flags) {
1738 if (pr->pr_flags & PR_HOST) {
1740 * Copy the parent's host info. As with pr_ip4 above,
1741 * the lack of a lock on the parent is not a problem;
1742 * it is always set with allprison_lock at least
1743 * shared, and is held exclusively here.
1745 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
1746 sizeof(pr->pr_hostname));
1747 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
1748 sizeof(pr->pr_domainname));
1749 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
1750 sizeof(pr->pr_hostuuid));
1751 pr->pr_hostid = pr->pr_parent->pr_hostid;
1753 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
1754 /* Set this prison, and any descendants without PR_HOST. */
1756 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
1758 strlcpy(pr->pr_domainname, domain,
1759 sizeof(pr->pr_domainname));
1761 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
1763 pr->pr_hostid = hid;
1764 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1765 if (tpr->pr_flags & PR_HOST)
1769 strlcpy(tpr->pr_hostname,
1771 sizeof(tpr->pr_hostname));
1773 strlcpy(tpr->pr_domainname,
1775 sizeof(tpr->pr_domainname));
1777 strlcpy(tpr->pr_hostuuid,
1779 sizeof(tpr->pr_hostuuid));
1781 tpr->pr_hostid = hid;
1785 if ((tallow = ch_allow & ~pr_allow)) {
1786 /* Clear allow bits in all children. */
1787 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1788 tpr->pr_allow &= ~tallow;
1790 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
1792 * Persistent prisons get an extra reference, and prisons losing their
1793 * persist flag lose that reference. Only do this for existing prisons
1794 * for now, so new ones will remain unseen until after the module
1795 * handlers have completed.
1797 born = pr->pr_uref == 0;
1798 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) {
1799 if (pr_flags & PR_PERSIST) {
1807 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
1808 mtx_unlock(&pr->pr_mtx);
1811 if (racct_enable && created)
1812 prison_racct_attach(pr);
1815 /* Locks may have prevented a complete restriction of child IP
1816 * addresses. If so, allocate some more memory and try again.
1821 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
1822 mtx_lock(&pr->pr_mtx);
1824 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1826 if (tpr->pr_flags & PR_VNET) {
1831 if (prison_restrict_ip4(tpr, ip4)) {
1838 mtx_unlock(&pr->pr_mtx);
1844 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
1845 mtx_lock(&pr->pr_mtx);
1847 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1849 if (tpr->pr_flags & PR_VNET) {
1854 if (prison_restrict_ip6(tpr, ip6)) {
1861 mtx_unlock(&pr->pr_mtx);
1865 /* Let the modules do their work. */
1866 sx_downgrade(&allprison_lock);
1868 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
1870 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
1871 prison_deref(pr, created
1873 : PD_DEREF | PD_LIST_SLOCKED);
1877 error = osd_jail_call(pr, PR_METHOD_SET, opts);
1880 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
1881 prison_deref(pr, created
1883 : PD_DEREF | PD_LIST_SLOCKED);
1887 /* Attach this process to the prison if requested. */
1888 if (flags & JAIL_ATTACH) {
1889 mtx_lock(&pr->pr_mtx);
1890 error = do_jail_attach(td, pr);
1892 vfs_opterror(opts, "attach failed");
1894 prison_deref(pr, PD_DEREF);
1900 if (racct_enable && !created) {
1901 if (!(flags & JAIL_ATTACH))
1902 sx_sunlock(&allprison_lock);
1903 prison_racct_modify(pr);
1904 if (!(flags & JAIL_ATTACH))
1905 sx_slock(&allprison_lock);
1909 td->td_retval[0] = pr->pr_id;
1912 * Now that it is all there, drop the temporary reference from existing
1913 * prisons. Or add a reference to newly created persistent prisons
1914 * (which was not done earlier so that the prison would not be publicly
1918 prison_deref(pr, (flags & JAIL_ATTACH)
1920 : PD_DEREF | PD_LIST_SLOCKED);
1922 if (pr_flags & PR_PERSIST) {
1923 mtx_lock(&pr->pr_mtx);
1926 mtx_unlock(&pr->pr_mtx);
1928 if (!(flags & JAIL_ATTACH))
1929 sx_sunlock(&allprison_lock);
1935 prison_deref(pr, created
1936 ? PD_LOCKED | PD_LIST_XLOCKED
1937 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
1940 sx_xunlock(&allprison_lock);
1946 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
1947 if (errmsg_len > 0) {
1948 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
1949 if (errmsg_pos > 0) {
1950 if (optuio->uio_segflg == UIO_SYSSPACE)
1952 optuio->uio_iov[errmsg_pos].iov_base,
1956 optuio->uio_iov[errmsg_pos].iov_base,
1963 free(ip4, M_PRISON);
1966 free(ip6, M_PRISON);
1969 free(g_path, M_TEMP);
1976 * struct jail_get_args {
1977 * struct iovec *iovp;
1978 * unsigned int iovcnt;
1983 sys_jail_get(struct thread *td, struct jail_get_args *uap)
1988 /* Check that we have an even number of iovecs. */
1989 if (uap->iovcnt & 1)
1992 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
1995 error = kern_jail_get(td, auio, uap->flags);
1997 error = copyout(auio->uio_iov, uap->iovp,
1998 uap->iovcnt * sizeof (struct iovec));
2004 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
2006 struct prison *pr, *mypr;
2008 struct vfsoptlist *opts;
2009 char *errmsg, *name;
2010 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos;
2012 if (flags & ~JAIL_GET_MASK)
2015 /* Get the parameter list. */
2016 error = vfs_buildopts(optuio, &opts);
2019 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
2020 mypr = td->td_ucred->cr_prison;
2023 * Find the prison specified by one of: lastjid, jid, name.
2025 sx_slock(&allprison_lock);
2026 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
2028 TAILQ_FOREACH(pr, &allprison, pr_list) {
2029 if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
2030 mtx_lock(&pr->pr_mtx);
2031 if (pr->pr_ref > 0 &&
2032 (pr->pr_uref > 0 || (flags & JAIL_DYING)))
2034 mtx_unlock(&pr->pr_mtx);
2040 vfs_opterror(opts, "no jail after %d", jid);
2041 goto done_unlock_list;
2042 } else if (error != ENOENT)
2043 goto done_unlock_list;
2045 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
2048 pr = prison_find_child(mypr, jid);
2050 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
2051 mtx_unlock(&pr->pr_mtx);
2053 vfs_opterror(opts, "jail %d is dying",
2055 goto done_unlock_list;
2060 vfs_opterror(opts, "jail %d not found", jid);
2061 goto done_unlock_list;
2063 } else if (error != ENOENT)
2064 goto done_unlock_list;
2066 error = vfs_getopt(opts, "name", (void **)&name, &len);
2068 if (len == 0 || name[len - 1] != '\0') {
2070 goto done_unlock_list;
2072 pr = prison_find_name(mypr, name);
2074 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
2075 mtx_unlock(&pr->pr_mtx);
2077 vfs_opterror(opts, "jail \"%s\" is dying",
2079 goto done_unlock_list;
2084 vfs_opterror(opts, "jail \"%s\" not found", name);
2085 goto done_unlock_list;
2086 } else if (error != ENOENT)
2087 goto done_unlock_list;
2089 vfs_opterror(opts, "no jail specified");
2091 goto done_unlock_list;
2094 /* Get the parameters of the prison. */
2097 td->td_retval[0] = pr->pr_id;
2098 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
2099 if (error != 0 && error != ENOENT)
2101 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
2102 error = vfs_setopt(opts, "parent", &i, sizeof(i));
2103 if (error != 0 && error != ENOENT)
2105 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
2106 if (error != 0 && error != ENOENT)
2108 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
2109 sizeof(pr->pr_cpuset->cs_id));
2110 if (error != 0 && error != ENOENT)
2112 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
2113 if (error != 0 && error != ENOENT)
2116 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
2117 pr->pr_ip4s * sizeof(*pr->pr_ip4));
2118 if (error != 0 && error != ENOENT)
2122 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
2123 pr->pr_ip6s * sizeof(*pr->pr_ip6));
2124 if (error != 0 && error != ENOENT)
2127 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
2128 sizeof(pr->pr_securelevel));
2129 if (error != 0 && error != ENOENT)
2131 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
2132 sizeof(pr->pr_childcount));
2133 if (error != 0 && error != ENOENT)
2135 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
2136 sizeof(pr->pr_childmax));
2137 if (error != 0 && error != ENOENT)
2139 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
2140 if (error != 0 && error != ENOENT)
2142 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
2143 if (error != 0 && error != ENOENT)
2145 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
2146 if (error != 0 && error != ENOENT)
2148 #ifdef COMPAT_FREEBSD32
2149 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
2150 uint32_t hid32 = pr->pr_hostid;
2152 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
2155 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
2156 sizeof(pr->pr_hostid));
2157 if (error != 0 && error != ENOENT)
2159 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
2160 sizeof(pr->pr_enforce_statfs));
2161 if (error != 0 && error != ENOENT)
2163 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
2164 sizeof(pr->pr_devfs_rsnum));
2165 if (error != 0 && error != ENOENT)
2167 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
2169 if (pr_flag_names[fi] == NULL)
2171 i = (pr->pr_flags & (1 << fi)) ? 1 : 0;
2172 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i));
2173 if (error != 0 && error != ENOENT)
2176 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i));
2177 if (error != 0 && error != ENOENT)
2180 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
2183 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
2184 i = pr_flag_jailsys[fi].disable &&
2185 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE
2186 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW
2189 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i));
2190 if (error != 0 && error != ENOENT)
2193 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
2195 if (pr_allow_names[fi] == NULL)
2197 i = (pr->pr_allow & (1 << fi)) ? 1 : 0;
2198 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i));
2199 if (error != 0 && error != ENOENT)
2202 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i));
2203 if (error != 0 && error != ENOENT)
2206 i = (pr->pr_uref == 0);
2207 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2208 if (error != 0 && error != ENOENT)
2211 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2212 if (error != 0 && error != ENOENT)
2214 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate,
2215 sizeof(pr->pr_osreldate));
2216 if (error != 0 && error != ENOENT)
2218 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease);
2219 if (error != 0 && error != ENOENT)
2222 /* Get the module parameters. */
2223 mtx_unlock(&pr->pr_mtx);
2225 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2228 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
2230 /* By now, all parameters should have been noted. */
2231 TAILQ_FOREACH(opt, opts, link) {
2232 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2234 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2239 /* Write the fetched parameters back to userspace. */
2241 TAILQ_FOREACH(opt, opts, link) {
2242 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2243 pos = 2 * opt->pos + 1;
2244 optuio->uio_iov[pos].iov_len = opt->len;
2245 if (opt->value != NULL) {
2246 if (optuio->uio_segflg == UIO_SYSSPACE) {
2248 optuio->uio_iov[pos].iov_base,
2251 error = copyout(opt->value,
2252 optuio->uio_iov[pos].iov_base,
2263 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
2267 sx_sunlock(&allprison_lock);
2269 if (error && errmsg_pos >= 0) {
2270 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2271 errmsg_pos = 2 * errmsg_pos + 1;
2272 if (errmsg_len > 0) {
2273 if (optuio->uio_segflg == UIO_SYSSPACE)
2275 optuio->uio_iov[errmsg_pos].iov_base,
2279 optuio->uio_iov[errmsg_pos].iov_base,
2289 * struct jail_remove_args {
2294 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
2296 struct prison *pr, *cpr, *lpr, *tpr;
2299 error = priv_check(td, PRIV_JAIL_REMOVE);
2303 sx_xlock(&allprison_lock);
2304 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2306 sx_xunlock(&allprison_lock);
2310 /* Remove all descendants of this prison, then remove this prison. */
2312 if (!LIST_EMPTY(&pr->pr_children)) {
2313 mtx_unlock(&pr->pr_mtx);
2315 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
2316 mtx_lock(&cpr->pr_mtx);
2317 if (cpr->pr_ref > 0) {
2321 /* Already removed - do not do it again. */
2324 mtx_unlock(&cpr->pr_mtx);
2326 mtx_lock(&lpr->pr_mtx);
2327 prison_remove_one(lpr);
2328 sx_xlock(&allprison_lock);
2333 mtx_lock(&lpr->pr_mtx);
2334 prison_remove_one(lpr);
2335 sx_xlock(&allprison_lock);
2337 mtx_lock(&pr->pr_mtx);
2339 prison_remove_one(pr);
2344 prison_remove_one(struct prison *pr)
2349 /* If the prison was persistent, it is not anymore. */
2351 if (pr->pr_flags & PR_PERSIST) {
2354 pr->pr_flags &= ~PR_PERSIST;
2358 * jail_remove added a reference. If that's the only one, remove
2361 KASSERT(pr->pr_ref > 0,
2362 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
2363 if (pr->pr_ref == 1) {
2365 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
2369 mtx_unlock(&pr->pr_mtx);
2370 sx_xunlock(&allprison_lock);
2372 * Kill all processes unfortunate enough to be attached to this prison.
2374 sx_slock(&allproc_lock);
2375 LIST_FOREACH(p, &allproc, p_list) {
2377 if (p->p_state != PRS_NEW && p->p_ucred &&
2378 p->p_ucred->cr_prison == pr)
2379 kern_psignal(p, SIGKILL);
2382 sx_sunlock(&allproc_lock);
2383 /* Remove the temporary reference added by jail_remove. */
2384 prison_deref(pr, deuref | PD_DEREF);
2389 * struct jail_attach_args {
2394 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
2399 error = priv_check(td, PRIV_JAIL_ATTACH);
2403 sx_slock(&allprison_lock);
2404 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2406 sx_sunlock(&allprison_lock);
2411 * Do not allow a process to attach to a prison that is not
2412 * considered to be "alive".
2414 if (pr->pr_uref == 0) {
2415 mtx_unlock(&pr->pr_mtx);
2416 sx_sunlock(&allprison_lock);
2420 return (do_jail_attach(td, pr));
2424 do_jail_attach(struct thread *td, struct prison *pr)
2427 struct ucred *newcred, *oldcred;
2431 * XXX: Note that there is a slight race here if two threads
2432 * in the same privileged process attempt to attach to two
2433 * different jails at the same time. It is important for
2434 * user processes not to do this, or they might end up with
2435 * a process root from one prison, but attached to the jail
2440 mtx_unlock(&pr->pr_mtx);
2442 /* Let modules do whatever they need to prepare for attaching. */
2443 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
2445 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
2448 sx_sunlock(&allprison_lock);
2451 * Reparent the newly attached process to this jail.
2454 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
2458 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
2459 if ((error = change_dir(pr->pr_root, td)) != 0)
2462 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
2465 VOP_UNLOCK(pr->pr_root, 0);
2466 if ((error = change_root(pr->pr_root, td)))
2471 oldcred = crcopysafe(p, newcred);
2472 newcred->cr_prison = pr;
2473 p->p_ucred = newcred;
2477 racct_proc_ucred_changed(p, oldcred, newcred);
2479 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF);
2484 VOP_UNLOCK(pr->pr_root, 0);
2486 /* Tell modules this thread is still in its old jail after all. */
2487 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td);
2488 prison_deref(pr, PD_DEREF | PD_DEUREF);
2494 * Returns a locked prison instance, or NULL on failure.
2497 prison_find(int prid)
2501 sx_assert(&allprison_lock, SX_LOCKED);
2502 TAILQ_FOREACH(pr, &allprison, pr_list) {
2503 if (pr->pr_id == prid) {
2504 mtx_lock(&pr->pr_mtx);
2507 mtx_unlock(&pr->pr_mtx);
2514 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
2517 prison_find_child(struct prison *mypr, int prid)
2522 sx_assert(&allprison_lock, SX_LOCKED);
2523 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2524 if (pr->pr_id == prid) {
2525 mtx_lock(&pr->pr_mtx);
2528 mtx_unlock(&pr->pr_mtx);
2535 * Look for the name relative to mypr. Returns a locked prison or NULL.
2538 prison_find_name(struct prison *mypr, const char *name)
2540 struct prison *pr, *deadpr;
2544 sx_assert(&allprison_lock, SX_LOCKED);
2545 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
2548 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2549 if (!strcmp(pr->pr_name + mylen, name)) {
2550 mtx_lock(&pr->pr_mtx);
2551 if (pr->pr_ref > 0) {
2552 if (pr->pr_uref > 0)
2556 mtx_unlock(&pr->pr_mtx);
2559 /* There was no valid prison - perhaps there was a dying one. */
2560 if (deadpr != NULL) {
2561 mtx_lock(&deadpr->pr_mtx);
2562 if (deadpr->pr_ref == 0) {
2563 mtx_unlock(&deadpr->pr_mtx);
2571 * See if a prison has the specific flag set.
2574 prison_flag(struct ucred *cred, unsigned flag)
2577 /* This is an atomic read, so no locking is necessary. */
2578 return (cred->cr_prison->pr_flags & flag);
2582 prison_allow(struct ucred *cred, unsigned flag)
2585 /* This is an atomic read, so no locking is necessary. */
2586 return (cred->cr_prison->pr_allow & flag);
2590 * Remove a prison reference. If that was the last reference, remove the
2591 * prison itself - but not in this context in case there are locks held.
2594 prison_free_locked(struct prison *pr)
2598 mtx_assert(&pr->pr_mtx, MA_OWNED);
2600 mtx_unlock(&pr->pr_mtx);
2602 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2606 prison_free(struct prison *pr)
2609 mtx_lock(&pr->pr_mtx);
2610 prison_free_locked(pr);
2614 * Complete a call to either prison_free or prison_proc_free.
2617 prison_complete(void *context, int pending)
2619 struct prison *pr = context;
2621 mtx_lock(&pr->pr_mtx);
2622 prison_deref(pr, pr->pr_uref
2623 ? PD_DEREF | PD_DEUREF | PD_LOCKED : PD_LOCKED);
2627 * Remove a prison reference (usually). This internal version assumes no
2628 * mutexes are held, except perhaps the prison itself. If there are no more
2629 * references, release and delist the prison. On completion, the prison lock
2630 * and the allprison lock are both unlocked.
2633 prison_deref(struct prison *pr, int flags)
2635 struct prison *ppr, *tpr;
2638 if (!(flags & PD_LOCKED))
2639 mtx_lock(&pr->pr_mtx);
2641 if (flags & PD_DEUREF) {
2642 KASSERT(pr->pr_uref > 0,
2643 ("prison_deref PD_DEUREF on a dead prison (jid=%d)",
2646 lasturef = pr->pr_uref == 0;
2649 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0"));
2652 if (flags & PD_DEREF) {
2653 KASSERT(pr->pr_ref > 0,
2654 ("prison_deref PD_DEREF on a dead prison (jid=%d)",
2659 mtx_unlock(&pr->pr_mtx);
2662 * Tell the modules if the last user reference was removed
2663 * (even it sticks around in dying state).
2666 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) {
2668 sx_slock(&allprison_lock);
2669 flags |= PD_LIST_SLOCKED;
2671 sx_xlock(&allprison_lock);
2672 flags |= PD_LIST_XLOCKED;
2675 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
2676 mtx_lock(&pr->pr_mtx);
2678 mtx_unlock(&pr->pr_mtx);
2681 /* If the prison still has references, nothing else to do. */
2683 if (flags & PD_LIST_SLOCKED)
2684 sx_sunlock(&allprison_lock);
2685 else if (flags & PD_LIST_XLOCKED)
2686 sx_xunlock(&allprison_lock);
2690 if (flags & PD_LIST_SLOCKED) {
2691 if (!sx_try_upgrade(&allprison_lock)) {
2692 sx_sunlock(&allprison_lock);
2693 sx_xlock(&allprison_lock);
2695 } else if (!(flags & PD_LIST_XLOCKED))
2696 sx_xlock(&allprison_lock);
2698 TAILQ_REMOVE(&allprison, pr, pr_list);
2699 LIST_REMOVE(pr, pr_sibling);
2700 ppr = pr->pr_parent;
2701 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
2702 tpr->pr_childcount--;
2703 sx_xunlock(&allprison_lock);
2706 if (pr->pr_vnet != ppr->pr_vnet)
2707 vnet_destroy(pr->pr_vnet);
2709 if (pr->pr_root != NULL)
2711 mtx_destroy(&pr->pr_mtx);
2713 free(pr->pr_ip4, M_PRISON);
2716 free(pr->pr_ip6, M_PRISON);
2718 if (pr->pr_cpuset != NULL)
2719 cpuset_rel(pr->pr_cpuset);
2723 prison_racct_detach(pr);
2727 /* Removing a prison frees a reference on its parent. */
2729 mtx_lock(&pr->pr_mtx);
2730 flags = PD_DEREF | PD_DEUREF;
2735 prison_hold_locked(struct prison *pr)
2738 mtx_assert(&pr->pr_mtx, MA_OWNED);
2739 KASSERT(pr->pr_ref > 0,
2740 ("Trying to hold dead prison (jid=%d).", pr->pr_id));
2745 prison_hold(struct prison *pr)
2748 mtx_lock(&pr->pr_mtx);
2749 prison_hold_locked(pr);
2750 mtx_unlock(&pr->pr_mtx);
2754 prison_proc_hold(struct prison *pr)
2757 mtx_lock(&pr->pr_mtx);
2758 KASSERT(pr->pr_uref > 0,
2759 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
2761 mtx_unlock(&pr->pr_mtx);
2765 prison_proc_free(struct prison *pr)
2768 mtx_lock(&pr->pr_mtx);
2769 KASSERT(pr->pr_uref > 0,
2770 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
2771 if (pr->pr_uref > 1)
2775 * Don't remove the last user reference in this context, which
2776 * is expected to be a process that is not only locked, but
2780 mtx_unlock(&pr->pr_mtx);
2781 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2784 mtx_unlock(&pr->pr_mtx);
2790 * Restrict a prison's IP address list with its parent's, possibly replacing
2791 * it. Return true if the replacement buffer was used (or would have been).
2794 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
2799 ppr = pr->pr_parent;
2800 if (!(pr->pr_flags & PR_IP4_USER)) {
2801 /* This has no user settings, so just copy the parent's list. */
2802 if (pr->pr_ip4s < ppr->pr_ip4s) {
2804 * There's no room for the parent's list. Use the
2805 * new list buffer, which is assumed to be big enough
2806 * (if it was passed). If there's no buffer, try to
2810 if (newip4 == NULL) {
2811 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
2812 M_PRISON, M_NOWAIT);
2816 if (newip4 != NULL) {
2817 bcopy(ppr->pr_ip4, newip4,
2818 ppr->pr_ip4s * sizeof(*newip4));
2819 free(pr->pr_ip4, M_PRISON);
2820 pr->pr_ip4 = newip4;
2821 pr->pr_ip4s = ppr->pr_ip4s;
2825 pr->pr_ip4s = ppr->pr_ip4s;
2826 if (pr->pr_ip4s > 0)
2827 bcopy(ppr->pr_ip4, pr->pr_ip4,
2828 pr->pr_ip4s * sizeof(*newip4));
2829 else if (pr->pr_ip4 != NULL) {
2830 free(pr->pr_ip4, M_PRISON);
2833 } else if (pr->pr_ip4s > 0) {
2834 /* Remove addresses that aren't in the parent. */
2835 for (ij = 0; ij < ppr->pr_ip4s; ij++)
2836 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
2838 if (ij < ppr->pr_ip4s)
2841 bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
2842 --pr->pr_ip4s * sizeof(*pr->pr_ip4));
2845 for (ij = 1; ii < pr->pr_ip4s; ) {
2846 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
2850 switch (ij >= ppr->pr_ip4s ? -1 :
2851 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
2853 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
2854 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
2865 if (pr->pr_ip4s == 0) {
2866 pr->pr_flags |= PR_IP4_DISABLE;
2867 free(pr->pr_ip4, M_PRISON);
2875 * Pass back primary IPv4 address of this jail.
2877 * If not restricted return success but do not alter the address. Caller has
2878 * to make sure to initialize it correctly (e.g. INADDR_ANY).
2880 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2881 * Address returned in NBO.
2884 prison_get_ip4(struct ucred *cred, struct in_addr *ia)
2888 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2889 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2891 pr = cred->cr_prison;
2892 if (!(pr->pr_flags & PR_IP4))
2894 mtx_lock(&pr->pr_mtx);
2895 if (!(pr->pr_flags & PR_IP4)) {
2896 mtx_unlock(&pr->pr_mtx);
2899 if (pr->pr_ip4 == NULL) {
2900 mtx_unlock(&pr->pr_mtx);
2901 return (EAFNOSUPPORT);
2904 ia->s_addr = pr->pr_ip4[0].s_addr;
2905 mtx_unlock(&pr->pr_mtx);
2910 * Return 1 if we should do proper source address selection or are not jailed.
2911 * We will return 0 if we should bypass source address selection in favour
2912 * of the primary jail IPv4 address. Only in this case *ia will be updated and
2914 * Return EAFNOSUPPORT, in case this jail does not allow IPv4.
2917 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
2923 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2924 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2929 pr = cred->cr_prison;
2930 if (pr->pr_flags & PR_IP4_SADDRSEL)
2933 lia.s_addr = INADDR_ANY;
2934 error = prison_get_ip4(cred, &lia);
2937 if (lia.s_addr == INADDR_ANY)
2940 ia->s_addr = lia.s_addr;
2945 * Return true if pr1 and pr2 have the same IPv4 address restrictions.
2948 prison_equal_ip4(struct prison *pr1, struct prison *pr2)
2955 * No need to lock since the PR_IP4_USER flag can't be altered for
2958 while (pr1 != &prison0 &&
2960 !(pr1->pr_flags & PR_VNET) &&
2962 !(pr1->pr_flags & PR_IP4_USER))
2963 pr1 = pr1->pr_parent;
2964 while (pr2 != &prison0 &&
2966 !(pr2->pr_flags & PR_VNET) &&
2968 !(pr2->pr_flags & PR_IP4_USER))
2969 pr2 = pr2->pr_parent;
2970 return (pr1 == pr2);
2974 * Make sure our (source) address is set to something meaningful to this
2977 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2978 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2979 * doesn't allow IPv4. Address passed in in NBO and returned in NBO.
2982 prison_local_ip4(struct ucred *cred, struct in_addr *ia)
2988 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2989 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2991 pr = cred->cr_prison;
2992 if (!(pr->pr_flags & PR_IP4))
2994 mtx_lock(&pr->pr_mtx);
2995 if (!(pr->pr_flags & PR_IP4)) {
2996 mtx_unlock(&pr->pr_mtx);
2999 if (pr->pr_ip4 == NULL) {
3000 mtx_unlock(&pr->pr_mtx);
3001 return (EAFNOSUPPORT);
3004 ia0.s_addr = ntohl(ia->s_addr);
3005 if (ia0.s_addr == INADDR_LOOPBACK) {
3006 ia->s_addr = pr->pr_ip4[0].s_addr;
3007 mtx_unlock(&pr->pr_mtx);
3011 if (ia0.s_addr == INADDR_ANY) {
3013 * In case there is only 1 IPv4 address, bind directly.
3015 if (pr->pr_ip4s == 1)
3016 ia->s_addr = pr->pr_ip4[0].s_addr;
3017 mtx_unlock(&pr->pr_mtx);
3021 error = _prison_check_ip4(pr, ia);
3022 mtx_unlock(&pr->pr_mtx);
3027 * Rewrite destination address in case we will connect to loopback address.
3029 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
3030 * Address passed in in NBO and returned in NBO.
3033 prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
3037 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3038 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
3040 pr = cred->cr_prison;
3041 if (!(pr->pr_flags & PR_IP4))
3043 mtx_lock(&pr->pr_mtx);
3044 if (!(pr->pr_flags & PR_IP4)) {
3045 mtx_unlock(&pr->pr_mtx);
3048 if (pr->pr_ip4 == NULL) {
3049 mtx_unlock(&pr->pr_mtx);
3050 return (EAFNOSUPPORT);
3053 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) {
3054 ia->s_addr = pr->pr_ip4[0].s_addr;
3055 mtx_unlock(&pr->pr_mtx);
3060 * Return success because nothing had to be changed.
3062 mtx_unlock(&pr->pr_mtx);
3067 * Check if given address belongs to the jail referenced by cred/prison.
3069 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
3070 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3071 * doesn't allow IPv4. Address passed in in NBO.
3074 _prison_check_ip4(struct prison *pr, struct in_addr *ia)
3079 * Check the primary IP.
3081 if (pr->pr_ip4[0].s_addr == ia->s_addr)
3085 * All the other IPs are sorted so we can do a binary search.
3088 z = pr->pr_ip4s - 2;
3091 d = qcmp_v4(&pr->pr_ip4[i+1], ia);
3100 return (EADDRNOTAVAIL);
3104 prison_check_ip4(struct ucred *cred, struct in_addr *ia)
3109 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3110 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
3112 pr = cred->cr_prison;
3113 if (!(pr->pr_flags & PR_IP4))
3115 mtx_lock(&pr->pr_mtx);
3116 if (!(pr->pr_flags & PR_IP4)) {
3117 mtx_unlock(&pr->pr_mtx);
3120 if (pr->pr_ip4 == NULL) {
3121 mtx_unlock(&pr->pr_mtx);
3122 return (EAFNOSUPPORT);
3125 error = _prison_check_ip4(pr, ia);
3126 mtx_unlock(&pr->pr_mtx);
3133 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
3138 ppr = pr->pr_parent;
3139 if (!(pr->pr_flags & PR_IP6_USER)) {
3140 /* This has no user settings, so just copy the parent's list. */
3141 if (pr->pr_ip6s < ppr->pr_ip6s) {
3143 * There's no room for the parent's list. Use the
3144 * new list buffer, which is assumed to be big enough
3145 * (if it was passed). If there's no buffer, try to
3149 if (newip6 == NULL) {
3150 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
3151 M_PRISON, M_NOWAIT);
3155 if (newip6 != NULL) {
3156 bcopy(ppr->pr_ip6, newip6,
3157 ppr->pr_ip6s * sizeof(*newip6));
3158 free(pr->pr_ip6, M_PRISON);
3159 pr->pr_ip6 = newip6;
3160 pr->pr_ip6s = ppr->pr_ip6s;
3164 pr->pr_ip6s = ppr->pr_ip6s;
3165 if (pr->pr_ip6s > 0)
3166 bcopy(ppr->pr_ip6, pr->pr_ip6,
3167 pr->pr_ip6s * sizeof(*newip6));
3168 else if (pr->pr_ip6 != NULL) {
3169 free(pr->pr_ip6, M_PRISON);
3172 } else if (pr->pr_ip6s > 0) {
3173 /* Remove addresses that aren't in the parent. */
3174 for (ij = 0; ij < ppr->pr_ip6s; ij++)
3175 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
3178 if (ij < ppr->pr_ip6s)
3181 bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
3182 --pr->pr_ip6s * sizeof(*pr->pr_ip6));
3185 for (ij = 1; ii < pr->pr_ip6s; ) {
3186 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
3191 switch (ij >= ppr->pr_ip6s ? -1 :
3192 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
3194 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
3195 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
3206 if (pr->pr_ip6s == 0) {
3207 pr->pr_flags |= PR_IP6_DISABLE;
3208 free(pr->pr_ip6, M_PRISON);
3216 * Pass back primary IPv6 address for this jail.
3218 * If not restricted return success but do not alter the address. Caller has
3219 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
3221 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3224 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
3228 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3229 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3231 pr = cred->cr_prison;
3232 if (!(pr->pr_flags & PR_IP6))
3234 mtx_lock(&pr->pr_mtx);
3235 if (!(pr->pr_flags & PR_IP6)) {
3236 mtx_unlock(&pr->pr_mtx);
3239 if (pr->pr_ip6 == NULL) {
3240 mtx_unlock(&pr->pr_mtx);
3241 return (EAFNOSUPPORT);
3244 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3245 mtx_unlock(&pr->pr_mtx);
3250 * Return 1 if we should do proper source address selection or are not jailed.
3251 * We will return 0 if we should bypass source address selection in favour
3252 * of the primary jail IPv6 address. Only in this case *ia will be updated and
3254 * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
3257 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
3260 struct in6_addr lia6;
3263 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3264 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3269 pr = cred->cr_prison;
3270 if (pr->pr_flags & PR_IP6_SADDRSEL)
3274 error = prison_get_ip6(cred, &lia6);
3277 if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
3280 bcopy(&lia6, ia6, sizeof(struct in6_addr));
3285 * Return true if pr1 and pr2 have the same IPv6 address restrictions.
3288 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
3294 while (pr1 != &prison0 &&
3296 !(pr1->pr_flags & PR_VNET) &&
3298 !(pr1->pr_flags & PR_IP6_USER))
3299 pr1 = pr1->pr_parent;
3300 while (pr2 != &prison0 &&
3302 !(pr2->pr_flags & PR_VNET) &&
3304 !(pr2->pr_flags & PR_IP6_USER))
3305 pr2 = pr2->pr_parent;
3306 return (pr1 == pr2);
3310 * Make sure our (source) address is set to something meaningful to this jail.
3312 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
3313 * when needed while binding.
3315 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3316 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3317 * doesn't allow IPv6.
3320 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
3325 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3326 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3328 pr = cred->cr_prison;
3329 if (!(pr->pr_flags & PR_IP6))
3331 mtx_lock(&pr->pr_mtx);
3332 if (!(pr->pr_flags & PR_IP6)) {
3333 mtx_unlock(&pr->pr_mtx);
3336 if (pr->pr_ip6 == NULL) {
3337 mtx_unlock(&pr->pr_mtx);
3338 return (EAFNOSUPPORT);
3341 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3342 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3343 mtx_unlock(&pr->pr_mtx);
3347 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
3349 * In case there is only 1 IPv6 address, and v6only is true,
3350 * then bind directly.
3352 if (v6only != 0 && pr->pr_ip6s == 1)
3353 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3354 mtx_unlock(&pr->pr_mtx);
3358 error = _prison_check_ip6(pr, ia6);
3359 mtx_unlock(&pr->pr_mtx);
3364 * Rewrite destination address in case we will connect to loopback address.
3366 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3369 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
3373 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3374 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3376 pr = cred->cr_prison;
3377 if (!(pr->pr_flags & PR_IP6))
3379 mtx_lock(&pr->pr_mtx);
3380 if (!(pr->pr_flags & PR_IP6)) {
3381 mtx_unlock(&pr->pr_mtx);
3384 if (pr->pr_ip6 == NULL) {
3385 mtx_unlock(&pr->pr_mtx);
3386 return (EAFNOSUPPORT);
3389 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3390 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3391 mtx_unlock(&pr->pr_mtx);
3396 * Return success because nothing had to be changed.
3398 mtx_unlock(&pr->pr_mtx);
3403 * Check if given address belongs to the jail referenced by cred/prison.
3405 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3406 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3407 * doesn't allow IPv6.
3410 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6)
3415 * Check the primary IP.
3417 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
3421 * All the other IPs are sorted so we can do a binary search.
3424 z = pr->pr_ip6s - 2;
3427 d = qcmp_v6(&pr->pr_ip6[i+1], ia6);
3436 return (EADDRNOTAVAIL);
3440 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6)
3445 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3446 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3448 pr = cred->cr_prison;
3449 if (!(pr->pr_flags & PR_IP6))
3451 mtx_lock(&pr->pr_mtx);
3452 if (!(pr->pr_flags & PR_IP6)) {
3453 mtx_unlock(&pr->pr_mtx);
3456 if (pr->pr_ip6 == NULL) {
3457 mtx_unlock(&pr->pr_mtx);
3458 return (EAFNOSUPPORT);
3461 error = _prison_check_ip6(pr, ia6);
3462 mtx_unlock(&pr->pr_mtx);
3468 * Check if a jail supports the given address family.
3470 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
3474 prison_check_af(struct ucred *cred, int af)
3479 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3481 pr = cred->cr_prison;
3483 /* Prisons with their own network stack are not limited. */
3484 if (prison_owns_vnet(cred))
3493 if (pr->pr_flags & PR_IP4)
3495 mtx_lock(&pr->pr_mtx);
3496 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
3497 error = EAFNOSUPPORT;
3498 mtx_unlock(&pr->pr_mtx);
3504 if (pr->pr_flags & PR_IP6)
3506 mtx_lock(&pr->pr_mtx);
3507 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
3508 error = EAFNOSUPPORT;
3509 mtx_unlock(&pr->pr_mtx);
3517 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
3518 error = EAFNOSUPPORT;
3524 * Check if given address belongs to the jail referenced by cred (wrapper to
3525 * prison_check_ip[46]).
3527 * Returns 0 if jail doesn't restrict the address family or if address belongs
3528 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
3529 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
3532 prison_if(struct ucred *cred, struct sockaddr *sa)
3535 struct sockaddr_in *sai;
3538 struct sockaddr_in6 *sai6;
3542 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3543 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
3546 if (prison_owns_vnet(cred))
3551 switch (sa->sa_family)
3555 sai = (struct sockaddr_in *)sa;
3556 error = prison_check_ip4(cred, &sai->sin_addr);
3561 sai6 = (struct sockaddr_in6 *)sa;
3562 error = prison_check_ip6(cred, &sai6->sin6_addr);
3566 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
3567 error = EAFNOSUPPORT;
3573 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
3576 prison_check(struct ucred *cred1, struct ucred *cred2)
3579 return ((cred1->cr_prison == cred2->cr_prison ||
3580 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
3584 * Return 1 if p2 is a child of p1, otherwise 0.
3587 prison_ischild(struct prison *pr1, struct prison *pr2)
3590 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
3597 * Return 1 if the passed credential is in a jail, otherwise 0.
3600 jailed(struct ucred *cred)
3603 return (cred->cr_prison != &prison0);
3607 * Return 1 if the passed credential is in a jail and that jail does not
3608 * have its own virtual network stack, otherwise 0.
3611 jailed_without_vnet(struct ucred *cred)
3617 if (prison_owns_vnet(cred))
3625 * Return the correct hostname (domainname, et al) for the passed credential.
3628 getcredhostname(struct ucred *cred, char *buf, size_t size)
3633 * A NULL credential can be used to shortcut to the physical
3634 * system's hostname.
3636 pr = (cred != NULL) ? cred->cr_prison : &prison0;
3637 mtx_lock(&pr->pr_mtx);
3638 strlcpy(buf, pr->pr_hostname, size);
3639 mtx_unlock(&pr->pr_mtx);
3643 getcreddomainname(struct ucred *cred, char *buf, size_t size)
3646 mtx_lock(&cred->cr_prison->pr_mtx);
3647 strlcpy(buf, cred->cr_prison->pr_domainname, size);
3648 mtx_unlock(&cred->cr_prison->pr_mtx);
3652 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
3655 mtx_lock(&cred->cr_prison->pr_mtx);
3656 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
3657 mtx_unlock(&cred->cr_prison->pr_mtx);
3661 getcredhostid(struct ucred *cred, unsigned long *hostid)
3664 mtx_lock(&cred->cr_prison->pr_mtx);
3665 *hostid = cred->cr_prison->pr_hostid;
3666 mtx_unlock(&cred->cr_prison->pr_mtx);
3671 * Determine whether the prison represented by cred owns
3672 * its vnet rather than having it inherited.
3674 * Returns 1 in case the prison owns the vnet, 0 otherwise.
3677 prison_owns_vnet(struct ucred *cred)
3681 * vnets cannot be added/removed after jail creation,
3682 * so no need to lock here.
3684 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
3689 * Determine whether the subject represented by cred can "see"
3690 * status of a mount point.
3691 * Returns: 0 for permitted, ENOENT otherwise.
3692 * XXX: This function should be called cr_canseemount() and should be
3693 * placed in kern_prot.c.
3696 prison_canseemount(struct ucred *cred, struct mount *mp)
3702 pr = cred->cr_prison;
3703 if (pr->pr_enforce_statfs == 0)
3705 if (pr->pr_root->v_mount == mp)
3707 if (pr->pr_enforce_statfs == 2)
3710 * If jail's chroot directory is set to "/" we should be able to see
3711 * all mount-points from inside a jail.
3712 * This is ugly check, but this is the only situation when jail's
3713 * directory ends with '/'.
3715 if (strcmp(pr->pr_path, "/") == 0)
3717 len = strlen(pr->pr_path);
3719 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
3722 * Be sure that we don't have situation where jail's root directory
3723 * is "/some/path" and mount point is "/some/pathpath".
3725 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
3731 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
3733 char jpath[MAXPATHLEN];
3737 pr = cred->cr_prison;
3738 if (pr->pr_enforce_statfs == 0)
3740 if (prison_canseemount(cred, mp) != 0) {
3741 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3742 strlcpy(sp->f_mntonname, "[restricted]",
3743 sizeof(sp->f_mntonname));
3746 if (pr->pr_root->v_mount == mp) {
3748 * Clear current buffer data, so we are sure nothing from
3749 * the valid path left there.
3751 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3752 *sp->f_mntonname = '/';
3756 * If jail's chroot directory is set to "/" we should be able to see
3757 * all mount-points from inside a jail.
3759 if (strcmp(pr->pr_path, "/") == 0)
3761 len = strlen(pr->pr_path);
3762 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
3764 * Clear current buffer data, so we are sure nothing from
3765 * the valid path left there.
3767 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3768 if (*jpath == '\0') {
3769 /* Should never happen. */
3770 *sp->f_mntonname = '/';
3772 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
3777 * Check with permission for a specific privilege is granted within jail. We
3778 * have a specific list of accepted privileges; the rest are denied.
3781 prison_priv_check(struct ucred *cred, int priv)
3789 * Privileges specific to prisons with a virtual network stack.
3790 * There might be a duplicate entry here in case the privilege
3791 * is only granted conditionally in the legacy jail case.
3796 * NFS-specific privileges.
3798 case PRIV_NFS_DAEMON:
3799 case PRIV_NFS_LOCKD:
3802 * Network stack privileges.
3804 case PRIV_NET_BRIDGE:
3807 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
3808 case PRIV_NET_ROUTE:
3810 case PRIV_NET_SETIFMTU:
3811 case PRIV_NET_SETIFFLAGS:
3812 case PRIV_NET_SETIFCAP:
3813 case PRIV_NET_SETIFDESCR:
3814 case PRIV_NET_SETIFNAME :
3815 case PRIV_NET_SETIFMETRIC:
3816 case PRIV_NET_SETIFPHYS:
3817 case PRIV_NET_SETIFMAC:
3818 case PRIV_NET_ADDMULTI:
3819 case PRIV_NET_DELMULTI:
3820 case PRIV_NET_HWIOCTL:
3821 case PRIV_NET_SETLLADDR:
3822 case PRIV_NET_ADDIFGROUP:
3823 case PRIV_NET_DELIFGROUP:
3824 case PRIV_NET_IFCREATE:
3825 case PRIV_NET_IFDESTROY:
3826 case PRIV_NET_ADDIFADDR:
3827 case PRIV_NET_DELIFADDR:
3830 case PRIV_NET_SETIFVNET:
3831 case PRIV_NET_SETIFFIB:
3834 * 802.11-related privileges.
3836 case PRIV_NET80211_GETKEY:
3838 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */
3843 * AppleTalk privileges.
3845 case PRIV_NETATALK_RESERVEDPORT:
3850 case PRIV_NETATM_CFG:
3851 case PRIV_NETATM_ADD:
3852 case PRIV_NETATM_DEL:
3853 case PRIV_NETATM_SET:
3856 * Bluetooth privileges.
3858 case PRIV_NETBLUETOOTH_RAW:
3862 * Netgraph and netgraph module privileges.
3864 case PRIV_NETGRAPH_CONTROL:
3866 case PRIV_NETGRAPH_TTY:
3870 * IPv4 and IPv6 privileges.
3872 case PRIV_NETINET_IPFW:
3873 case PRIV_NETINET_DIVERT:
3874 case PRIV_NETINET_PF:
3875 case PRIV_NETINET_DUMMYNET:
3876 case PRIV_NETINET_CARP:
3877 case PRIV_NETINET_MROUTE:
3878 case PRIV_NETINET_RAW:
3879 case PRIV_NETINET_ADDRCTRL6:
3880 case PRIV_NETINET_ND6:
3881 case PRIV_NETINET_SCOPE6:
3882 case PRIV_NETINET_ALIFETIME6:
3883 case PRIV_NETINET_IPSEC:
3884 case PRIV_NETINET_BINDANY:
3888 * IPX/SPX privileges.
3890 case PRIV_NETIPX_RESERVEDPORT:
3891 case PRIV_NETIPX_RAW:
3905 * No default: or deny here.
3906 * In case of no permit fall through to next switch().
3908 if (cred->cr_prison->pr_flags & PR_VNET)
3916 * Allow ktrace privileges for root in jail.
3922 * Allow jailed processes to configure audit identity and
3923 * submit audit records (login, etc). In the future we may
3924 * want to further refine the relationship between audit and
3927 case PRIV_AUDIT_GETAUDIT:
3928 case PRIV_AUDIT_SETAUDIT:
3929 case PRIV_AUDIT_SUBMIT:
3933 * Allow jailed processes to manipulate process UNIX
3934 * credentials in any way they see fit.
3936 case PRIV_CRED_SETUID:
3937 case PRIV_CRED_SETEUID:
3938 case PRIV_CRED_SETGID:
3939 case PRIV_CRED_SETEGID:
3940 case PRIV_CRED_SETGROUPS:
3941 case PRIV_CRED_SETREUID:
3942 case PRIV_CRED_SETREGID:
3943 case PRIV_CRED_SETRESUID:
3944 case PRIV_CRED_SETRESGID:
3947 * Jail implements visibility constraints already, so allow
3948 * jailed root to override uid/gid-based constraints.
3950 case PRIV_SEEOTHERGIDS:
3951 case PRIV_SEEOTHERUIDS:
3954 * Jail implements inter-process debugging limits already, so
3955 * allow jailed root various debugging privileges.
3957 case PRIV_DEBUG_DIFFCRED:
3958 case PRIV_DEBUG_SUGID:
3959 case PRIV_DEBUG_UNPRIV:
3962 * Allow jail to set various resource limits and login
3963 * properties, and for now, exceed process resource limits.
3965 case PRIV_PROC_LIMIT:
3966 case PRIV_PROC_SETLOGIN:
3967 case PRIV_PROC_SETRLIMIT:
3970 * System V and POSIX IPC privileges are granted in jail.
3973 case PRIV_IPC_WRITE:
3974 case PRIV_IPC_ADMIN:
3975 case PRIV_IPC_MSGSIZE:
3979 * Jail operations within a jail work on child jails.
3981 case PRIV_JAIL_ATTACH:
3983 case PRIV_JAIL_REMOVE:
3986 * Jail implements its own inter-process limits, so allow
3987 * root processes in jail to change scheduling on other
3988 * processes in the same jail. Likewise for signalling.
3990 case PRIV_SCHED_DIFFCRED:
3991 case PRIV_SCHED_CPUSET:
3992 case PRIV_SIGNAL_DIFFCRED:
3993 case PRIV_SIGNAL_SUGID:
3996 * Allow jailed processes to write to sysctls marked as jail
3999 case PRIV_SYSCTL_WRITEJAIL:
4002 * Allow root in jail to manage a variety of quota
4003 * properties. These should likely be conditional on a
4004 * configuration option.
4006 case PRIV_VFS_GETQUOTA:
4007 case PRIV_VFS_SETQUOTA:
4010 * Since Jail relies on chroot() to implement file system
4011 * protections, grant many VFS privileges to root in jail.
4012 * Be careful to exclude mount-related and NFS-related
4016 case PRIV_VFS_WRITE:
4017 case PRIV_VFS_ADMIN:
4019 case PRIV_VFS_LOOKUP:
4020 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
4021 case PRIV_VFS_CHFLAGS_DEV:
4022 case PRIV_VFS_CHOWN:
4023 case PRIV_VFS_CHROOT:
4024 case PRIV_VFS_RETAINSUGID:
4025 case PRIV_VFS_FCHROOT:
4027 case PRIV_VFS_SETGID:
4029 case PRIV_VFS_STICKYFILE:
4032 * As in the non-jail case, non-root users are expected to be
4033 * able to read kernel/phyiscal memory (provided /dev/[k]mem
4034 * exists in the jail and they have permission to access it).
4036 case PRIV_KMEM_READ:
4040 * Depending on the global setting, allow privilege of
4041 * setting system flags.
4043 case PRIV_VFS_SYSFLAGS:
4044 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
4050 * Depending on the global setting, allow privilege of
4051 * mounting/unmounting file systems.
4053 case PRIV_VFS_MOUNT:
4054 case PRIV_VFS_UNMOUNT:
4055 case PRIV_VFS_MOUNT_NONUSER:
4056 case PRIV_VFS_MOUNT_OWNER:
4057 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT &&
4058 cred->cr_prison->pr_enforce_statfs < 2)
4064 * Allow jailed root to bind reserved ports and reuse in-use
4067 case PRIV_NETINET_RESERVEDPORT:
4068 case PRIV_NETINET_REUSEPORT:
4072 * Allow jailed root to set certian IPv4/6 (option) headers.
4074 case PRIV_NETINET_SETHDROPTS:
4078 * Conditionally allow creating raw sockets in jail.
4080 case PRIV_NETINET_RAW:
4081 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
4087 * Since jail implements its own visibility limits on netstat
4088 * sysctls, allow getcred. This allows identd to work in
4091 case PRIV_NETINET_GETCRED:
4095 * Allow jailed root to set loginclass.
4097 case PRIV_PROC_SETLOGINCLASS:
4102 * In all remaining cases, deny the privilege request. This
4103 * includes almost all network privileges, many system
4104 * configuration privileges.
4111 * Return the part of pr2's name that is relative to pr1, or the whole name
4112 * if it does not directly follow.
4116 prison_name(struct prison *pr1, struct prison *pr2)
4120 /* Jails see themselves as "0" (if they see themselves at all). */
4123 name = pr2->pr_name;
4124 if (prison_ischild(pr1, pr2)) {
4126 * pr1 isn't locked (and allprison_lock may not be either)
4127 * so its length can't be counted on. But the number of dots
4128 * can be counted on - and counted.
4130 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
4131 name = strchr(name, '.') + 1;
4137 * Return the part of pr2's path that is relative to pr1, or the whole path
4138 * if it does not directly follow.
4141 prison_path(struct prison *pr1, struct prison *pr2)
4143 char *path1, *path2;
4146 path1 = pr1->pr_path;
4147 path2 = pr2->pr_path;
4148 if (!strcmp(path1, "/"))
4150 len1 = strlen(path1);
4151 if (strncmp(path1, path2, len1))
4153 if (path2[len1] == '\0')
4155 if (path2[len1] == '/')
4156 return (path2 + len1);
4162 * Jail-related sysctls.
4164 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
4168 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
4171 struct prison *pr, *cpr;
4173 struct in_addr *ip4 = NULL;
4177 struct in6_addr *ip6 = NULL;
4182 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
4183 pr = req->td->td_ucred->cr_prison;
4185 sx_slock(&allprison_lock);
4186 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
4187 #if defined(INET) || defined(INET6)
4190 mtx_lock(&cpr->pr_mtx);
4192 if (cpr->pr_ip4s > 0) {
4193 if (ip4s < cpr->pr_ip4s) {
4194 ip4s = cpr->pr_ip4s;
4195 mtx_unlock(&cpr->pr_mtx);
4196 ip4 = realloc(ip4, ip4s *
4197 sizeof(struct in_addr), M_TEMP, M_WAITOK);
4200 bcopy(cpr->pr_ip4, ip4,
4201 cpr->pr_ip4s * sizeof(struct in_addr));
4205 if (cpr->pr_ip6s > 0) {
4206 if (ip6s < cpr->pr_ip6s) {
4207 ip6s = cpr->pr_ip6s;
4208 mtx_unlock(&cpr->pr_mtx);
4209 ip6 = realloc(ip6, ip6s *
4210 sizeof(struct in6_addr), M_TEMP, M_WAITOK);
4213 bcopy(cpr->pr_ip6, ip6,
4214 cpr->pr_ip6s * sizeof(struct in6_addr));
4217 if (cpr->pr_ref == 0) {
4218 mtx_unlock(&cpr->pr_mtx);
4221 bzero(xp, sizeof(*xp));
4222 xp->pr_version = XPRISON_VERSION;
4223 xp->pr_id = cpr->pr_id;
4224 xp->pr_state = cpr->pr_uref > 0
4225 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
4226 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
4227 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
4228 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
4230 xp->pr_ip4s = cpr->pr_ip4s;
4233 xp->pr_ip6s = cpr->pr_ip6s;
4235 mtx_unlock(&cpr->pr_mtx);
4236 error = SYSCTL_OUT(req, xp, sizeof(*xp));
4240 if (xp->pr_ip4s > 0) {
4241 error = SYSCTL_OUT(req, ip4,
4242 xp->pr_ip4s * sizeof(struct in_addr));
4248 if (xp->pr_ip6s > 0) {
4249 error = SYSCTL_OUT(req, ip6,
4250 xp->pr_ip6s * sizeof(struct in6_addr));
4256 sx_sunlock(&allprison_lock);
4267 SYSCTL_OID(_security_jail, OID_AUTO, list,
4268 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4269 sysctl_jail_list, "S", "List of active jails");
4272 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
4276 injail = jailed(req->td->td_ucred);
4277 error = SYSCTL_OUT(req, &injail, sizeof(injail));
4282 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
4283 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4284 sysctl_jail_jailed, "I", "Process in jail?");
4287 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
4289 int error, havevnet;
4291 struct ucred *cred = req->td->td_ucred;
4293 havevnet = jailed(cred) && prison_owns_vnet(cred);
4297 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
4302 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
4303 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4304 sysctl_jail_vnet, "I", "Jail owns VNET?");
4306 #if defined(INET) || defined(INET6)
4307 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
4308 &jail_max_af_ips, 0,
4309 "Number of IP addresses a jail may have at most per address family (deprecated)");
4313 * Default parameters for jail(2) compatability. For historical reasons,
4314 * the sysctl names have varying similarity to the parameter names. Prisons
4315 * just see their own parameters, and can't change them.
4318 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
4321 int allow, error, i;
4323 pr = req->td->td_ucred->cr_prison;
4324 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
4326 /* Get the current flag value, and convert it to a boolean. */
4327 i = (allow & arg2) ? 1 : 0;
4330 error = sysctl_handle_int(oidp, &i, 0, req);
4331 if (error || !req->newptr)
4337 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
4340 mtx_lock(&prison0.pr_mtx);
4341 jail_default_allow = (jail_default_allow & ~arg2) | i;
4342 mtx_unlock(&prison0.pr_mtx);
4346 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
4347 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4348 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
4349 "Processes in jail can set their hostnames (deprecated)");
4350 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
4351 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4352 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
4353 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)");
4354 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
4355 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4356 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
4357 "Processes in jail can use System V IPC primitives (deprecated)");
4358 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
4359 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4360 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
4361 "Prison root can create raw sockets (deprecated)");
4362 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
4363 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4364 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
4365 "Processes in jail can alter system file flags (deprecated)");
4366 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
4367 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4368 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
4369 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)");
4370 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed,
4371 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4372 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I",
4373 "Processes in jail can mount the devfs file system (deprecated)");
4374 SYSCTL_PROC(_security_jail, OID_AUTO, mount_fdescfs_allowed,
4375 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4376 NULL, PR_ALLOW_MOUNT_FDESCFS, sysctl_jail_default_allow, "I",
4377 "Processes in jail can mount the fdescfs file system (deprecated)");
4378 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed,
4379 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4380 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I",
4381 "Processes in jail can mount the nullfs file system (deprecated)");
4382 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed,
4383 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4384 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I",
4385 "Processes in jail can mount the procfs file system (deprecated)");
4386 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linprocfs_allowed,
4387 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4388 NULL, PR_ALLOW_MOUNT_LINPROCFS, sysctl_jail_default_allow, "I",
4389 "Processes in jail can mount the linprocfs file system (deprecated)");
4390 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linsysfs_allowed,
4391 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4392 NULL, PR_ALLOW_MOUNT_LINSYSFS, sysctl_jail_default_allow, "I",
4393 "Processes in jail can mount the linsysfs file system (deprecated)");
4394 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed,
4395 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4396 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I",
4397 "Processes in jail can mount the tmpfs file system (deprecated)");
4398 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed,
4399 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4400 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I",
4401 "Processes in jail can mount the zfs file system (deprecated)");
4404 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
4409 pr = req->td->td_ucred->cr_prison;
4410 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
4411 error = sysctl_handle_int(oidp, &level, 0, req);
4412 if (error || !req->newptr)
4414 *(int *)arg1 = level;
4418 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
4419 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4420 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
4421 sysctl_jail_default_level, "I",
4422 "Processes in jail cannot see all mounted file systems (deprecated)");
4424 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
4425 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
4426 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
4427 sysctl_jail_default_level, "I",
4428 "Ruleset for the devfs filesystem in jail (deprecated)");
4431 * Nodes to describe jail parameters. Maximum length of string parameters
4432 * is returned in the string itself, and the other parameters exist merely
4433 * to make themselves and their types known.
4435 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0,
4439 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
4446 switch (oidp->oid_kind & CTLTYPE)
4452 if (!(req->flags & SCTL_MASK32))
4454 return (SYSCTL_OUT(req, &l, sizeof(l)));
4458 return (SYSCTL_OUT(req, &i, sizeof(i)));
4459 case CTLTYPE_STRING:
4460 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
4462 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
4463 case CTLTYPE_STRUCT:
4465 return (SYSCTL_OUT(req, &s, sizeof(s)));
4471 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at
4472 * jail creation time but cannot be changed in an existing jail.
4474 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
4475 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
4476 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
4477 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
4478 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
4479 "I", "Jail secure level");
4480 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I",
4481 "Jail value for kern.osreldate and uname -K");
4482 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN,
4483 "Jail value for kern.osrelease and uname -r");
4484 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
4485 "I", "Jail cannot see all mounted file systems");
4486 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
4487 "I", "Ruleset for in-jail devfs mounts");
4488 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
4489 "B", "Jail persistence");
4491 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
4492 "E,jailsys", "Virtual network stack");
4494 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
4495 "B", "Jail is in the process of shutting down");
4497 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
4498 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
4499 "I", "Current number of child jails");
4500 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
4501 "I", "Maximum number of child jails");
4503 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
4504 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
4506 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
4507 "Jail NIS domainname");
4508 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
4510 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
4511 "LU", "Jail host ID");
4513 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
4514 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
4517 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
4518 "Jail IPv4 address virtualization");
4519 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
4520 "S,in_addr,a", "Jail IPv4 addresses");
4521 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4522 "B", "Do (not) use IPv4 source address selection rather than the "
4523 "primary jail IPv4 address.");
4526 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
4527 "Jail IPv6 address virtualization");
4528 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
4529 "S,in6_addr,a", "Jail IPv6 addresses");
4530 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4531 "B", "Do (not) use IPv6 source address selection rather than the "
4532 "primary jail IPv6 address.");
4535 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
4536 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
4537 "B", "Jail may set hostname");
4538 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
4539 "B", "Jail may use SYSV IPC");
4540 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
4541 "B", "Jail may create raw sockets");
4542 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
4543 "B", "Jail may alter system file flags");
4544 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
4545 "B", "Jail may set file quotas");
4546 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
4547 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
4549 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
4550 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
4551 "B", "Jail may mount/unmount jail-friendly file systems in general");
4552 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW,
4553 "B", "Jail may mount the devfs file system");
4554 SYSCTL_JAIL_PARAM(_allow_mount, fdescfs, CTLTYPE_INT | CTLFLAG_RW,
4555 "B", "Jail may mount the fdescfs file system");
4556 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW,
4557 "B", "Jail may mount the nullfs file system");
4558 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW,
4559 "B", "Jail may mount the procfs file system");
4560 SYSCTL_JAIL_PARAM(_allow_mount, linprocfs, CTLTYPE_INT | CTLFLAG_RW,
4561 "B", "Jail may mount the linprocfs file system");
4562 SYSCTL_JAIL_PARAM(_allow_mount, linsysfs, CTLTYPE_INT | CTLFLAG_RW,
4563 "B", "Jail may mount the linsysfs file system");
4564 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW,
4565 "B", "Jail may mount the tmpfs file system");
4566 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW,
4567 "B", "Jail may mount the zfs file system");
4571 prison_racct_foreach(void (*callback)(struct racct *racct,
4572 void *arg2, void *arg3), void *arg2, void *arg3)
4574 struct prison_racct *prr;
4576 ASSERT_RACCT_ENABLED();
4578 sx_slock(&allprison_lock);
4579 LIST_FOREACH(prr, &allprison_racct, prr_next)
4580 (callback)(prr->prr_racct, arg2, arg3);
4581 sx_sunlock(&allprison_lock);
4584 static struct prison_racct *
4585 prison_racct_find_locked(const char *name)
4587 struct prison_racct *prr;
4589 ASSERT_RACCT_ENABLED();
4590 sx_assert(&allprison_lock, SA_XLOCKED);
4592 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
4595 LIST_FOREACH(prr, &allprison_racct, prr_next) {
4596 if (strcmp(name, prr->prr_name) != 0)
4599 /* Found prison_racct with a matching name? */
4600 prison_racct_hold(prr);
4604 /* Add new prison_racct. */
4605 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
4606 racct_create(&prr->prr_racct);
4608 strcpy(prr->prr_name, name);
4609 refcount_init(&prr->prr_refcount, 1);
4610 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
4615 struct prison_racct *
4616 prison_racct_find(const char *name)
4618 struct prison_racct *prr;
4620 ASSERT_RACCT_ENABLED();
4622 sx_xlock(&allprison_lock);
4623 prr = prison_racct_find_locked(name);
4624 sx_xunlock(&allprison_lock);
4629 prison_racct_hold(struct prison_racct *prr)
4632 ASSERT_RACCT_ENABLED();
4634 refcount_acquire(&prr->prr_refcount);
4638 prison_racct_free_locked(struct prison_racct *prr)
4641 ASSERT_RACCT_ENABLED();
4642 sx_assert(&allprison_lock, SA_XLOCKED);
4644 if (refcount_release(&prr->prr_refcount)) {
4645 racct_destroy(&prr->prr_racct);
4646 LIST_REMOVE(prr, prr_next);
4647 free(prr, M_PRISON_RACCT);
4652 prison_racct_free(struct prison_racct *prr)
4656 ASSERT_RACCT_ENABLED();
4657 sx_assert(&allprison_lock, SA_UNLOCKED);
4659 old = prr->prr_refcount;
4660 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1))
4663 sx_xlock(&allprison_lock);
4664 prison_racct_free_locked(prr);
4665 sx_xunlock(&allprison_lock);
4669 prison_racct_attach(struct prison *pr)
4671 struct prison_racct *prr;
4673 ASSERT_RACCT_ENABLED();
4674 sx_assert(&allprison_lock, SA_XLOCKED);
4676 prr = prison_racct_find_locked(pr->pr_name);
4677 KASSERT(prr != NULL, ("cannot find prison_racct"));
4679 pr->pr_prison_racct = prr;
4683 * Handle jail renaming. From the racct point of view, renaming means
4684 * moving from one prison_racct to another.
4687 prison_racct_modify(struct prison *pr)
4691 struct prison_racct *oldprr;
4693 ASSERT_RACCT_ENABLED();
4695 sx_slock(&allproc_lock);
4696 sx_xlock(&allprison_lock);
4698 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
4699 sx_xunlock(&allprison_lock);
4700 sx_sunlock(&allproc_lock);
4704 oldprr = pr->pr_prison_racct;
4705 pr->pr_prison_racct = NULL;
4707 prison_racct_attach(pr);
4710 * Move resource utilisation records.
4712 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
4715 * Force rctl to reattach rules to processes.
4717 FOREACH_PROC_IN_SYSTEM(p) {
4719 cred = crhold(p->p_ucred);
4721 racct_proc_ucred_changed(p, cred, cred);
4725 sx_sunlock(&allproc_lock);
4726 prison_racct_free_locked(oldprr);
4727 sx_xunlock(&allprison_lock);
4731 prison_racct_detach(struct prison *pr)
4734 ASSERT_RACCT_ENABLED();
4735 sx_assert(&allprison_lock, SA_UNLOCKED);
4737 if (pr->pr_prison_racct == NULL)
4739 prison_racct_free(pr->pr_prison_racct);
4740 pr->pr_prison_racct = NULL;
4747 db_show_prison(struct prison *pr)
4750 #if defined(INET) || defined(INET6)
4755 char ip6buf[INET6_ADDRSTRLEN];
4758 db_printf("prison %p:\n", pr);
4759 db_printf(" jid = %d\n", pr->pr_id);
4760 db_printf(" name = %s\n", pr->pr_name);
4761 db_printf(" parent = %p\n", pr->pr_parent);
4762 db_printf(" ref = %d\n", pr->pr_ref);
4763 db_printf(" uref = %d\n", pr->pr_uref);
4764 db_printf(" path = %s\n", pr->pr_path);
4765 db_printf(" cpuset = %d\n", pr->pr_cpuset
4766 ? pr->pr_cpuset->cs_id : -1);
4768 db_printf(" vnet = %p\n", pr->pr_vnet);
4770 db_printf(" root = %p\n", pr->pr_root);
4771 db_printf(" securelevel = %d\n", pr->pr_securelevel);
4772 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
4773 db_printf(" children.max = %d\n", pr->pr_childmax);
4774 db_printf(" children.cur = %d\n", pr->pr_childcount);
4775 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
4776 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
4777 db_printf(" flags = 0x%x", pr->pr_flags);
4778 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
4780 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi)))
4781 db_printf(" %s", pr_flag_names[fi]);
4782 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
4784 jsf = pr->pr_flags &
4785 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
4786 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name,
4787 pr_flag_jailsys[fi].disable &&
4788 (jsf == pr_flag_jailsys[fi].disable) ? "disable"
4789 : (jsf == pr_flag_jailsys[fi].new) ? "new"
4792 db_printf(" allow = 0x%x", pr->pr_allow);
4793 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
4795 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi)))
4796 db_printf(" %s", pr_allow_names[fi]);
4798 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
4799 db_printf(" host.hostname = %s\n", pr->pr_hostname);
4800 db_printf(" host.domainname = %s\n", pr->pr_domainname);
4801 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
4802 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
4804 db_printf(" ip4s = %d\n", pr->pr_ip4s);
4805 for (ii = 0; ii < pr->pr_ip4s; ii++)
4806 db_printf(" %s %s\n",
4807 ii == 0 ? "ip4.addr =" : " ",
4808 inet_ntoa(pr->pr_ip4[ii]));
4811 db_printf(" ip6s = %d\n", pr->pr_ip6s);
4812 for (ii = 0; ii < pr->pr_ip6s; ii++)
4813 db_printf(" %s %s\n",
4814 ii == 0 ? "ip6.addr =" : " ",
4815 ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
4819 DB_SHOW_COMMAND(prison, db_show_prison_command)
4825 * Show all prisons in the list, and prison0 which is not
4828 db_show_prison(&prison0);
4829 if (!db_pager_quit) {
4830 TAILQ_FOREACH(pr, &allprison, pr_list) {
4842 /* Look for a prison with the ID and with references. */
4843 TAILQ_FOREACH(pr, &allprison, pr_list)
4844 if (pr->pr_id == addr && pr->pr_ref > 0)
4847 /* Look again, without requiring a reference. */
4848 TAILQ_FOREACH(pr, &allprison, pr_list)
4849 if (pr->pr_id == addr)
4852 /* Assume address points to a valid prison. */
4853 pr = (struct prison *)addr;