2 * Copyright (c) 1999 Poul-Henning Kamp.
3 * Copyright (c) 2008 Bjoern A. Zeeb.
4 * Copyright (c) 2009 James Gritton.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include "opt_compat.h"
35 #include "opt_inet6.h"
37 #include <sys/param.h>
38 #include <sys/types.h>
39 #include <sys/kernel.h>
40 #include <sys/systm.h>
41 #include <sys/errno.h>
42 #include <sys/sysproto.h>
43 #include <sys/malloc.h>
47 #include <sys/taskqueue.h>
48 #include <sys/fcntl.h>
51 #include <sys/mutex.h>
52 #include <sys/racct.h>
53 #include <sys/refcount.h>
55 #include <sys/sysent.h>
56 #include <sys/namei.h>
57 #include <sys/mount.h>
58 #include <sys/queue.h>
59 #include <sys/socket.h>
60 #include <sys/syscallsubr.h>
61 #include <sys/sysctl.h>
62 #include <sys/vnode.h>
67 #include <netinet/in.h>
72 #include <netinet6/in6_var.h>
76 #include <security/mac/mac_framework.h>
78 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000"
80 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
81 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures");
83 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */
86 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
88 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
92 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
94 #define _PR_IP_SADDRSEL 0
98 /* prison0 describes what is "real" about the system. */
99 struct prison prison0 = {
105 .pr_securelevel = -1,
107 .pr_childmax = JAIL_MAX,
108 .pr_hostuuid = DEFAULT_HOSTUUID,
109 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
111 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
113 .pr_flags = PR_HOST|_PR_IP_SADDRSEL,
115 .pr_allow = PR_ALLOW_ALL,
117 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
119 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */
120 struct sx allprison_lock;
121 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
122 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
123 LIST_HEAD(, prison_racct) allprison_racct;
126 static int do_jail_attach(struct thread *td, struct prison *pr);
127 static void prison_complete(void *context, int pending);
128 static void prison_deref(struct prison *pr, int flags);
129 static char *prison_path(struct prison *pr1, struct prison *pr2);
130 static void prison_remove_one(struct prison *pr);
132 static void prison_racct_attach(struct prison *pr);
133 static void prison_racct_modify(struct prison *pr);
134 static void prison_racct_detach(struct prison *pr);
137 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia);
138 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4);
141 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6);
142 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6);
145 /* Flags for prison_deref */
146 #define PD_DEREF 0x01
147 #define PD_DEUREF 0x02
148 #define PD_LOCKED 0x04
149 #define PD_LIST_SLOCKED 0x08
150 #define PD_LIST_XLOCKED 0x10
153 * Parameter names corresponding to PR_* flag values. Size values are for kvm
154 * as we cannot figure out the size of a sparse array, or an array without a
157 static char *pr_flag_names[] = {
160 [7] = "ip4.saddrsel",
163 [8] = "ip6.saddrsel",
166 const size_t pr_flag_names_size = sizeof(pr_flag_names);
168 static char *pr_flag_nonames[] = {
171 [7] = "ip4.nosaddrsel",
174 [8] = "ip6.nosaddrsel",
177 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames);
179 struct jailsys_flags {
183 } pr_flag_jailsys[] = {
184 { "host", 0, PR_HOST },
186 { "vnet", 0, PR_VNET },
189 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER },
192 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER },
195 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
197 static char *pr_allow_names[] = {
198 "allow.set_hostname",
206 "allow.mount.nullfs",
208 "allow.mount.procfs",
210 const size_t pr_allow_names_size = sizeof(pr_allow_names);
212 static char *pr_allow_nonames[] = {
213 "allow.noset_hostname",
215 "allow.noraw_sockets",
220 "allow.mount.nodevfs",
221 "allow.mount.nonullfs",
223 "allow.mount.noprocfs",
225 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames);
227 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME
228 #define JAIL_DEFAULT_ENFORCE_STATFS 2
229 #define JAIL_DEFAULT_DEVFS_RSNUM 0
230 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
231 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
232 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
233 #if defined(INET) || defined(INET6)
234 static unsigned jail_max_af_ips = 255;
239 qcmp_v4(const void *ip1, const void *ip2)
244 * We need to compare in HBO here to get the list sorted as expected
245 * by the result of the code. Sorting NBO addresses gives you
246 * interesting results. If you do not understand, do not try.
248 iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
249 iab = ntohl(((const struct in_addr *)ip2)->s_addr);
252 * Do not simply return the difference of the two numbers, the int is
266 qcmp_v6(const void *ip1, const void *ip2)
268 const struct in6_addr *ia6a, *ia6b;
271 ia6a = (const struct in6_addr *)ip1;
272 ia6b = (const struct in6_addr *)ip2;
275 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
276 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
278 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
291 sys_jail(struct thread *td, struct jail_args *uap)
297 error = copyin(uap->jail, &version, sizeof(uint32_t));
306 /* FreeBSD single IPv4 jails. */
307 bzero(&j, sizeof(struct jail));
308 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
311 j.version = j0.version;
313 j.hostname = j0.hostname;
314 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */
320 * Version 1 was used by multi-IPv4 jail implementations
321 * that never made it into the official kernel.
325 case 2: /* JAIL_API_VERSION */
326 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
327 error = copyin(uap->jail, &j, sizeof(struct jail));
333 /* Sci-Fi jails are not supported, sorry. */
336 return (kern_jail(td, &j));
340 kern_jail(struct thread *td, struct jail *j)
342 struct iovec optiov[2 * (4
343 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0])
352 char *u_path, *u_hostname, *u_name;
355 struct in_addr *u_ip4;
358 struct in6_addr *u_ip6;
361 int error, enforce_statfs, fi;
363 bzero(&optiov, sizeof(optiov));
364 opt.uio_iov = optiov;
368 opt.uio_segflg = UIO_SYSSPACE;
369 opt.uio_rw = UIO_READ;
372 /* Set permissions for top-level jails from sysctls. */
373 if (!jailed(td->td_ucred)) {
374 for (fi = 0; fi < sizeof(pr_allow_names) /
375 sizeof(pr_allow_names[0]); fi++) {
376 optiov[opt.uio_iovcnt].iov_base =
377 (jail_default_allow & (1 << fi))
378 ? pr_allow_names[fi] : pr_allow_nonames[fi];
379 optiov[opt.uio_iovcnt].iov_len =
380 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
383 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
384 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
386 enforce_statfs = jail_default_enforce_statfs;
387 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
388 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
392 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
394 ip4s = (j->version == 0) ? 1 : j->ip4s;
395 if (ip4s > jail_max_af_ips)
397 tmplen += ip4s * sizeof(struct in_addr);
403 if (j->ip6s > jail_max_af_ips)
405 tmplen += j->ip6s * sizeof(struct in6_addr);
410 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
411 u_hostname = u_path + MAXPATHLEN;
412 u_name = u_hostname + MAXHOSTNAMELEN;
414 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
418 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
420 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
423 optiov[opt.uio_iovcnt].iov_base = "path";
424 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
426 optiov[opt.uio_iovcnt].iov_base = u_path;
427 error = copyinstr(j->path, u_path, MAXPATHLEN,
428 &optiov[opt.uio_iovcnt].iov_len);
430 free(u_path, M_TEMP);
434 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
435 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
437 optiov[opt.uio_iovcnt].iov_base = u_hostname;
438 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
439 &optiov[opt.uio_iovcnt].iov_len);
441 free(u_path, M_TEMP);
445 if (j->jailname != NULL) {
446 optiov[opt.uio_iovcnt].iov_base = "name";
447 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
449 optiov[opt.uio_iovcnt].iov_base = u_name;
450 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
451 &optiov[opt.uio_iovcnt].iov_len);
453 free(u_path, M_TEMP);
459 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
460 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
462 optiov[opt.uio_iovcnt].iov_base = u_ip4;
463 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
465 u_ip4->s_addr = j->ip4s;
467 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
469 free(u_path, M_TEMP);
476 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
477 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
479 optiov[opt.uio_iovcnt].iov_base = u_ip6;
480 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
481 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
483 free(u_path, M_TEMP);
488 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]),
489 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
490 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
491 free(u_path, M_TEMP);
497 * struct jail_set_args {
498 * struct iovec *iovp;
499 * unsigned int iovcnt;
504 sys_jail_set(struct thread *td, struct jail_set_args *uap)
509 /* Check that we have an even number of iovecs. */
513 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
516 error = kern_jail_set(td, auio, uap->flags);
522 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
529 struct in6_addr *ip6;
532 struct vfsoptlist *opts;
533 struct prison *pr, *deadpr, *mypr, *ppr, *tpr;
535 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
537 #if defined(INET) || defined(INET6)
542 size_t namelen, onamelen;
543 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos;
544 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
545 int fi, jid, jsys, len, level;
546 int childmax, rsnum, slevel, vfslocked;
547 int fullpath_disabled;
548 #if defined(INET) || defined(INET6)
557 uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
561 error = priv_check(td, PRIV_JAIL_SET);
562 if (!error && (flags & JAIL_ATTACH))
563 error = priv_check(td, PRIV_JAIL_ATTACH);
566 mypr = ppr = td->td_ucred->cr_prison;
567 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
569 if (flags & ~JAIL_SET_MASK)
573 * Check all the parameters before committing to anything. Not all
574 * errors can be caught early, but we may as well try. Also, this
575 * takes care of some expensive stuff (path lookup) before getting
576 * the allprison lock.
578 * XXX Jails are not filesystems, and jail parameters are not mount
579 * options. But it makes more sense to re-use the vfsopt code
580 * than duplicate it under a different name.
582 error = vfs_buildopts(optuio, &opts);
593 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
599 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
608 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
616 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
621 else if (enforce < 0 || enforce > 2) {
627 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
635 pr_flags = ch_flags = 0;
636 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
638 if (pr_flag_names[fi] == NULL)
640 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi);
641 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi);
643 ch_flags |= pr_flags;
644 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
646 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys,
653 case JAIL_SYS_DISABLE:
654 if (!pr_flag_jailsys[fi].disable) {
658 pr_flags |= pr_flag_jailsys[fi].disable;
661 pr_flags |= pr_flag_jailsys[fi].new;
663 case JAIL_SYS_INHERIT:
670 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable;
672 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE
673 && !(pr_flags & PR_PERSIST)) {
675 vfs_opterror(opts, "new jail must persist or attach");
679 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
681 vfs_opterror(opts, "vnet cannot be changed after creation");
686 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
688 vfs_opterror(opts, "ip4 cannot be changed after creation");
693 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
695 vfs_opterror(opts, "ip6 cannot be changed after creation");
700 pr_allow = ch_allow = 0;
701 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
703 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi);
704 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi);
706 ch_allow |= pr_allow;
708 error = vfs_getopt(opts, "name", (void **)&name, &len);
714 if (len == 0 || name[len - 1] != '\0') {
718 if (len > MAXHOSTNAMELEN) {
719 error = ENAMETOOLONG;
724 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
732 if (len == 0 || host[len - 1] != '\0') {
736 if (len > MAXHOSTNAMELEN) {
737 error = ENAMETOOLONG;
742 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
750 if (len == 0 || domain[len - 1] != '\0') {
754 if (len > MAXHOSTNAMELEN) {
755 error = ENAMETOOLONG;
760 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
768 if (len == 0 || uuid[len - 1] != '\0') {
772 if (len > HOSTUUIDLEN) {
773 error = ENAMETOOLONG;
778 #ifdef COMPAT_FREEBSD32
779 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
782 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
786 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
798 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
803 else if (ip4s & (sizeof(*ip4) - 1)) {
807 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE;
809 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE;
811 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER;
812 ip4s /= sizeof(*ip4);
813 if (ip4s > jail_max_af_ips) {
815 vfs_opterror(opts, "too many IPv4 addresses");
818 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
819 bcopy(op, ip4, ip4s * sizeof(*ip4));
821 * IP addresses are all sorted but ip[0] to preserve
822 * the primary IP address as given from userland.
823 * This special IP is used for unbound outgoing
824 * connections as well for "loopback" traffic in case
825 * source address selection cannot find any more fitting
826 * address to connect from.
829 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4);
831 * Check for duplicate addresses and do some simple
832 * zero and broadcast checks. If users give other bogus
833 * addresses it is their problem.
835 * We do not have to care about byte order for these
836 * checks so we will do them in NBO.
838 for (ii = 0; ii < ip4s; ii++) {
839 if (ip4[ii].s_addr == INADDR_ANY ||
840 ip4[ii].s_addr == INADDR_BROADCAST) {
845 (ip4[0].s_addr == ip4[ii+1].s_addr ||
846 ip4[ii].s_addr == ip4[ii+1].s_addr)) {
856 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
861 else if (ip6s & (sizeof(*ip6) - 1)) {
865 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE;
867 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE;
869 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER;
870 ip6s /= sizeof(*ip6);
871 if (ip6s > jail_max_af_ips) {
873 vfs_opterror(opts, "too many IPv6 addresses");
876 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
877 bcopy(op, ip6, ip6s * sizeof(*ip6));
879 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6);
880 for (ii = 0; ii < ip6s; ii++) {
881 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
886 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
887 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
897 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
898 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
901 "vnet jails cannot have IP address restrictions");
906 fullpath_disabled = 0;
908 error = vfs_getopt(opts, "path", (void **)&path, &len);
914 if (flags & JAIL_UPDATE) {
917 "path cannot be changed after creation");
920 if (len == 0 || path[len - 1] != '\0') {
924 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE, UIO_SYSSPACE,
929 vfslocked = NDHASGIANT(&nd);
931 NDFREE(&nd, NDF_ONLY_PNBUF);
932 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
933 strlcpy(g_path, path, MAXPATHLEN);
934 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
937 else if (error == ENODEV) {
938 /* proceed if sysctl debug.disablefullpath == 1 */
939 fullpath_disabled = 1;
940 if (len < 2 || (len == 2 && path[0] == '/'))
943 /* exit on other errors */
944 VFS_UNLOCK_GIANT(vfslocked);
947 if (root->v_type != VDIR) {
950 VFS_UNLOCK_GIANT(vfslocked);
954 VFS_UNLOCK_GIANT(vfslocked);
955 if (fullpath_disabled) {
956 /* Leave room for a real-root full pathname. */
957 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/")
958 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) {
959 error = ENAMETOOLONG;
966 * Grab the allprison lock before letting modules check their
967 * parameters. Once we have it, do not let go so we'll have a
968 * consistent view of the OSD list.
970 sx_xlock(&allprison_lock);
971 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts);
973 goto done_unlock_list;
975 /* By now, all parameters should have been noted. */
976 TAILQ_FOREACH(opt, opts, link) {
977 if (!opt->seen && strcmp(opt->name, "errmsg")) {
979 vfs_opterror(opts, "unknown parameter: %s", opt->name);
980 goto done_unlock_list;
985 * See if we are creating a new record or updating an existing one.
986 * This abuses the file error codes ENOENT and EEXIST.
988 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
991 vfs_opterror(opts, "no valid operation (create or update)");
992 goto done_unlock_list;
996 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
997 namelc = strrchr(name, '.');
998 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
1004 * See if a requested jid already exists. There is an
1005 * information leak here if the jid exists but is not within
1006 * the caller's jail hierarchy. Jail creators will get EEXIST
1007 * even though they cannot see the jail, and CREATE | UPDATE
1008 * will return ENOENT which is not normally a valid error.
1012 vfs_opterror(opts, "negative jid");
1013 goto done_unlock_list;
1015 pr = prison_find(jid);
1017 ppr = pr->pr_parent;
1018 /* Create: jid must not exist. */
1019 if (cuflags == JAIL_CREATE) {
1020 mtx_unlock(&pr->pr_mtx);
1022 vfs_opterror(opts, "jail %d already exists",
1024 goto done_unlock_list;
1026 if (!prison_ischild(mypr, pr)) {
1027 mtx_unlock(&pr->pr_mtx);
1029 } else if (pr->pr_uref == 0) {
1030 if (!(flags & JAIL_DYING)) {
1031 mtx_unlock(&pr->pr_mtx);
1033 vfs_opterror(opts, "jail %d is dying",
1035 goto done_unlock_list;
1036 } else if ((flags & JAIL_ATTACH) ||
1037 (pr_flags & PR_PERSIST)) {
1039 * A dying jail might be resurrected
1040 * (via attach or persist), but first
1041 * it must determine if another jail
1042 * has claimed its name. Accomplish
1043 * this by implicitly re-setting the
1047 name = prison_name(mypr, pr);
1052 /* Update: jid must exist. */
1053 if (cuflags == JAIL_UPDATE) {
1055 vfs_opterror(opts, "jail %d not found", jid);
1056 goto done_unlock_list;
1061 * If the caller provided a name, look for a jail by that name.
1062 * This has different semantics for creates and updates keyed by jid
1063 * (where the name must not already exist in a different jail),
1064 * and updates keyed by the name itself (where the name must exist
1065 * because that is the jail being updated).
1068 namelc = strrchr(name, '.');
1073 * This is a hierarchical name. Split it into the
1074 * parent and child names, and make sure the parent
1075 * exists or matches an already found jail.
1079 if (strncmp(name, ppr->pr_name, namelc - name)
1080 || ppr->pr_name[namelc - name] != '\0') {
1081 mtx_unlock(&pr->pr_mtx);
1084 "cannot change jail's parent");
1085 goto done_unlock_list;
1088 ppr = prison_find_name(mypr, name);
1092 "jail \"%s\" not found", name);
1093 goto done_unlock_list;
1095 mtx_unlock(&ppr->pr_mtx);
1099 if (name[0] != '\0') {
1101 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1104 FOREACH_PRISON_CHILD(ppr, tpr) {
1105 if (tpr != pr && tpr->pr_ref > 0 &&
1106 !strcmp(tpr->pr_name + namelen, name)) {
1108 cuflags != JAIL_CREATE) {
1109 mtx_lock(&tpr->pr_mtx);
1110 if (tpr->pr_ref > 0) {
1115 if (tpr->pr_uref > 0) {
1121 mtx_unlock(&tpr->pr_mtx);
1122 } else if (tpr->pr_uref > 0) {
1124 * Create, or update(jid):
1125 * name must not exist in an
1126 * active sibling jail.
1130 mtx_unlock(&pr->pr_mtx);
1132 "jail \"%s\" already exists",
1134 goto done_unlock_list;
1138 /* If no active jail is found, use a dying one. */
1139 if (deadpr != NULL && pr == NULL) {
1140 if (flags & JAIL_DYING) {
1141 mtx_lock(&deadpr->pr_mtx);
1142 if (deadpr->pr_ref == 0) {
1143 mtx_unlock(&deadpr->pr_mtx);
1147 } else if (cuflags == JAIL_UPDATE) {
1150 "jail \"%s\" is dying", name);
1151 goto done_unlock_list;
1154 /* Update: name must exist if no jid. */
1155 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1157 vfs_opterror(opts, "jail \"%s\" not found",
1159 goto done_unlock_list;
1163 /* Update: must provide a jid or name. */
1164 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1166 vfs_opterror(opts, "update specified no jail");
1167 goto done_unlock_list;
1170 /* If there's no prison to update, create a new one and link it in. */
1172 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1173 if (tpr->pr_childcount >= tpr->pr_childmax) {
1175 vfs_opterror(opts, "prison limit exceeded");
1176 goto done_unlock_list;
1179 mtx_lock(&ppr->pr_mtx);
1180 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) {
1181 mtx_unlock(&ppr->pr_mtx);
1183 vfs_opterror(opts, "parent jail went away!");
1184 goto done_unlock_list;
1188 mtx_unlock(&ppr->pr_mtx);
1189 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1191 /* Find the next free jid. */
1194 if (jid == JAIL_MAX)
1196 TAILQ_FOREACH(tpr, &allprison, pr_list) {
1197 if (tpr->pr_id < jid)
1199 if (tpr->pr_id > jid || tpr->pr_ref == 0) {
1200 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1203 if (jid == lastprid) {
1206 "no available jail IDs");
1208 prison_deref(ppr, PD_DEREF |
1209 PD_DEUREF | PD_LIST_XLOCKED);
1218 * The jail already has a jid (that did not yet exist),
1219 * so just find where to insert it.
1221 TAILQ_FOREACH(tpr, &allprison, pr_list)
1222 if (tpr->pr_id >= jid) {
1223 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1228 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1229 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1230 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1231 tpr->pr_childcount++;
1233 pr->pr_parent = ppr;
1236 /* Set some default values, and inherit some from the parent. */
1241 root = mypr->pr_root;
1244 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1245 pr->pr_flags |= PR_HOST;
1246 #if defined(INET) || defined(INET6)
1248 if (!(pr_flags & PR_VNET))
1252 if (!(ch_flags & PR_IP4_USER))
1254 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE;
1255 else if (!(pr_flags & PR_IP4_USER)) {
1256 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1257 if (ppr->pr_ip4 != NULL) {
1258 pr->pr_ip4s = ppr->pr_ip4s;
1259 pr->pr_ip4 = malloc(pr->pr_ip4s *
1260 sizeof(struct in_addr), M_PRISON,
1262 bcopy(ppr->pr_ip4, pr->pr_ip4,
1263 pr->pr_ip4s * sizeof(*pr->pr_ip4));
1268 if (!(ch_flags & PR_IP6_USER))
1270 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE;
1271 else if (!(pr_flags & PR_IP6_USER)) {
1272 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1273 if (ppr->pr_ip6 != NULL) {
1274 pr->pr_ip6s = ppr->pr_ip6s;
1275 pr->pr_ip6 = malloc(pr->pr_ip6s *
1276 sizeof(struct in6_addr), M_PRISON,
1278 bcopy(ppr->pr_ip6, pr->pr_ip6,
1279 pr->pr_ip6s * sizeof(*pr->pr_ip6));
1285 /* Source address selection is always on by default. */
1286 pr->pr_flags |= _PR_IP_SADDRSEL;
1288 pr->pr_securelevel = ppr->pr_securelevel;
1289 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1290 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
1291 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
1293 LIST_INIT(&pr->pr_children);
1294 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1297 /* Allocate a new vnet if specified. */
1298 pr->pr_vnet = (pr_flags & PR_VNET)
1299 ? vnet_alloc() : ppr->pr_vnet;
1302 * Allocate a dedicated cpuset for each jail.
1303 * Unlike other initial settings, this may return an erorr.
1305 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1307 prison_deref(pr, PD_LIST_XLOCKED);
1311 mtx_lock(&pr->pr_mtx);
1313 * New prisons do not yet have a reference, because we do not
1314 * want other to see the incomplete prison once the
1315 * allprison_lock is downgraded.
1320 * Grab a reference for existing prisons, to ensure they
1321 * continue to exist for the duration of the call.
1324 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1325 if ((pr->pr_flags & PR_VNET) &&
1326 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1329 "vnet jails cannot have IP address restrictions");
1330 goto done_deref_locked;
1334 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1337 "ip4 cannot be changed after creation");
1338 goto done_deref_locked;
1342 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1345 "ip6 cannot be changed after creation");
1346 goto done_deref_locked;
1351 /* Do final error checking before setting anything. */
1353 if (slevel < ppr->pr_securelevel) {
1355 goto done_deref_locked;
1359 if (childmax >= ppr->pr_childmax) {
1361 goto done_deref_locked;
1365 if (enforce < ppr->pr_enforce_statfs) {
1367 goto done_deref_locked;
1372 * devfs_rsnum is a uint16_t
1374 if (rsnum < 0 || rsnum > 65535) {
1376 goto done_deref_locked;
1379 * Nested jails always inherit parent's devfs ruleset
1381 if (jailed(td->td_ucred)) {
1382 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
1384 goto done_deref_locked;
1386 rsnum = ppr->pr_devfs_rsnum;
1391 if (ppr->pr_flags & PR_IP4) {
1393 * Make sure the new set of IP addresses is a
1394 * subset of the parent's list. Don't worry
1395 * about the parent being unlocked, as any
1396 * setting is done with allprison_lock held.
1398 for (ij = 0; ij < ppr->pr_ip4s; ij++)
1399 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
1401 if (ij == ppr->pr_ip4s) {
1403 goto done_deref_locked;
1406 for (ii = ij = 1; ii < ip4s; ii++) {
1407 if (ip4[ii].s_addr ==
1408 ppr->pr_ip4[0].s_addr)
1410 for (; ij < ppr->pr_ip4s; ij++)
1411 if (ip4[ii].s_addr ==
1412 ppr->pr_ip4[ij].s_addr)
1414 if (ij == ppr->pr_ip4s)
1417 if (ij == ppr->pr_ip4s) {
1419 goto done_deref_locked;
1424 * Check for conflicting IP addresses. We permit them
1425 * if there is no more than one IP on each jail. If
1426 * there is a duplicate on a jail with more than one
1427 * IP stop checking and return error.
1431 for (; tppr != &prison0; tppr = tppr->pr_parent)
1432 if (tppr->pr_flags & PR_VNET)
1435 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1438 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1440 tpr->pr_uref == 0) {
1444 if (!(tpr->pr_flags & PR_IP4_USER))
1447 if (tpr->pr_ip4 == NULL ||
1448 (ip4s == 1 && tpr->pr_ip4s == 1))
1450 for (ii = 0; ii < ip4s; ii++) {
1451 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) {
1454 "IPv4 addresses clash");
1455 goto done_deref_locked;
1463 if (ppr->pr_flags & PR_IP6) {
1465 * Make sure the new set of IP addresses is a
1466 * subset of the parent's list.
1468 for (ij = 0; ij < ppr->pr_ip6s; ij++)
1469 if (IN6_ARE_ADDR_EQUAL(&ip6[0],
1472 if (ij == ppr->pr_ip6s) {
1474 goto done_deref_locked;
1477 for (ii = ij = 1; ii < ip6s; ii++) {
1478 if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
1481 for (; ij < ppr->pr_ip6s; ij++)
1482 if (IN6_ARE_ADDR_EQUAL(
1483 &ip6[ii], &ppr->pr_ip6[ij]))
1485 if (ij == ppr->pr_ip6s)
1488 if (ij == ppr->pr_ip6s) {
1490 goto done_deref_locked;
1494 /* Check for conflicting IP addresses. */
1497 for (; tppr != &prison0; tppr = tppr->pr_parent)
1498 if (tppr->pr_flags & PR_VNET)
1501 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1504 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1506 tpr->pr_uref == 0) {
1510 if (!(tpr->pr_flags & PR_IP6_USER))
1513 if (tpr->pr_ip6 == NULL ||
1514 (ip6s == 1 && tpr->pr_ip6s == 1))
1516 for (ii = 0; ii < ip6s; ii++) {
1517 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) {
1520 "IPv6 addresses clash");
1521 goto done_deref_locked;
1527 onamelen = namelen = 0;
1529 /* Give a default name of the jid. Also allow the name to be
1530 * explicitly the jid - but not any other number, and only in
1531 * normal form (no leading zero/etc).
1533 if (name[0] == '\0')
1534 snprintf(name = numbuf, sizeof(numbuf), "%d", jid);
1535 else if ((strtoul(namelc, &p, 10) != jid ||
1536 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') {
1539 "name cannot be numeric (unless it is the jid)");
1540 goto done_deref_locked;
1543 * Make sure the name isn't too long for the prison or its
1546 onamelen = strlen(pr->pr_name);
1547 namelen = strlen(name);
1548 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) {
1549 error = ENAMETOOLONG;
1550 goto done_deref_locked;
1552 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1553 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
1554 sizeof(pr->pr_name)) {
1555 error = ENAMETOOLONG;
1556 goto done_deref_locked;
1560 if (pr_allow & ~ppr->pr_allow) {
1562 goto done_deref_locked;
1565 /* Set the parameters of the prison. */
1568 if (pr_flags & PR_IP4_USER) {
1569 pr->pr_flags |= PR_IP4;
1570 free(pr->pr_ip4, M_PRISON);
1574 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1576 if (tpr->pr_flags & PR_VNET) {
1581 if (prison_restrict_ip4(tpr, NULL)) {
1590 if (pr_flags & PR_IP6_USER) {
1591 pr->pr_flags |= PR_IP6;
1592 free(pr->pr_ip6, M_PRISON);
1596 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1598 if (tpr->pr_flags & PR_VNET) {
1603 if (prison_restrict_ip6(tpr, NULL)) {
1611 pr->pr_securelevel = slevel;
1612 /* Set all child jails to be at least this level. */
1613 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1614 if (tpr->pr_securelevel < slevel)
1615 tpr->pr_securelevel = slevel;
1618 pr->pr_childmax = childmax;
1619 /* Set all child jails to under this limit. */
1620 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
1621 if (tpr->pr_childmax > childmax - level)
1622 tpr->pr_childmax = childmax > level
1623 ? childmax - level : 0;
1626 pr->pr_enforce_statfs = enforce;
1627 /* Pass this restriction on to the children. */
1628 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1629 if (tpr->pr_enforce_statfs < enforce)
1630 tpr->pr_enforce_statfs = enforce;
1633 pr->pr_devfs_rsnum = rsnum;
1634 /* Pass this restriction on to the children. */
1635 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1636 tpr->pr_devfs_rsnum = rsnum;
1639 if (ppr == &prison0)
1640 strlcpy(pr->pr_name, name, sizeof(pr->pr_name));
1642 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
1643 ppr->pr_name, name);
1644 /* Change this component of child names. */
1645 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1646 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
1647 strlen(tpr->pr_name + onamelen) + 1);
1648 bcopy(pr->pr_name, tpr->pr_name, namelen);
1652 /* Try to keep a real-rooted full pathname. */
1653 if (fullpath_disabled && path[0] == '/' &&
1654 strcmp(mypr->pr_path, "/"))
1655 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s",
1656 mypr->pr_path, path);
1658 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
1661 if (PR_HOST & ch_flags & ~pr_flags) {
1662 if (pr->pr_flags & PR_HOST) {
1664 * Copy the parent's host info. As with pr_ip4 above,
1665 * the lack of a lock on the parent is not a problem;
1666 * it is always set with allprison_lock at least
1667 * shared, and is held exclusively here.
1669 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
1670 sizeof(pr->pr_hostname));
1671 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
1672 sizeof(pr->pr_domainname));
1673 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
1674 sizeof(pr->pr_hostuuid));
1675 pr->pr_hostid = pr->pr_parent->pr_hostid;
1677 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
1678 /* Set this prison, and any descendants without PR_HOST. */
1680 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
1682 strlcpy(pr->pr_domainname, domain,
1683 sizeof(pr->pr_domainname));
1685 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
1687 pr->pr_hostid = hid;
1688 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1689 if (tpr->pr_flags & PR_HOST)
1693 strlcpy(tpr->pr_hostname,
1695 sizeof(tpr->pr_hostname));
1697 strlcpy(tpr->pr_domainname,
1699 sizeof(tpr->pr_domainname));
1701 strlcpy(tpr->pr_hostuuid,
1703 sizeof(tpr->pr_hostuuid));
1705 tpr->pr_hostid = hid;
1709 if ((tallow = ch_allow & ~pr_allow)) {
1710 /* Clear allow bits in all children. */
1711 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1712 tpr->pr_allow &= ~tallow;
1714 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
1716 * Persistent prisons get an extra reference, and prisons losing their
1717 * persist flag lose that reference. Only do this for existing prisons
1718 * for now, so new ones will remain unseen until after the module
1719 * handlers have completed.
1721 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) {
1722 if (pr_flags & PR_PERSIST) {
1730 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
1731 mtx_unlock(&pr->pr_mtx);
1735 prison_racct_attach(pr);
1738 /* Locks may have prevented a complete restriction of child IP
1739 * addresses. If so, allocate some more memory and try again.
1744 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
1745 mtx_lock(&pr->pr_mtx);
1747 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1749 if (tpr->pr_flags & PR_VNET) {
1754 if (prison_restrict_ip4(tpr, ip4)) {
1761 mtx_unlock(&pr->pr_mtx);
1767 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
1768 mtx_lock(&pr->pr_mtx);
1770 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1772 if (tpr->pr_flags & PR_VNET) {
1777 if (prison_restrict_ip6(tpr, ip6)) {
1784 mtx_unlock(&pr->pr_mtx);
1788 /* Let the modules do their work. */
1789 sx_downgrade(&allprison_lock);
1791 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
1793 prison_deref(pr, PD_LIST_SLOCKED);
1797 error = osd_jail_call(pr, PR_METHOD_SET, opts);
1799 prison_deref(pr, created
1801 : PD_DEREF | PD_LIST_SLOCKED);
1805 /* Attach this process to the prison if requested. */
1806 if (flags & JAIL_ATTACH) {
1807 mtx_lock(&pr->pr_mtx);
1808 error = do_jail_attach(td, pr);
1810 vfs_opterror(opts, "attach failed");
1812 prison_deref(pr, PD_DEREF);
1819 sx_sunlock(&allprison_lock);
1820 prison_racct_modify(pr);
1821 sx_slock(&allprison_lock);
1825 td->td_retval[0] = pr->pr_id;
1828 * Now that it is all there, drop the temporary reference from existing
1829 * prisons. Or add a reference to newly created persistent prisons
1830 * (which was not done earlier so that the prison would not be publicly
1834 prison_deref(pr, (flags & JAIL_ATTACH)
1836 : PD_DEREF | PD_LIST_SLOCKED);
1838 if (pr_flags & PR_PERSIST) {
1839 mtx_lock(&pr->pr_mtx);
1842 mtx_unlock(&pr->pr_mtx);
1844 if (!(flags & JAIL_ATTACH))
1845 sx_sunlock(&allprison_lock);
1851 prison_deref(pr, created
1852 ? PD_LOCKED | PD_LIST_XLOCKED
1853 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
1856 sx_xunlock(&allprison_lock);
1859 vfslocked = VFS_LOCK_GIANT(root->v_mount);
1861 VFS_UNLOCK_GIANT(vfslocked);
1865 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
1866 if (errmsg_len > 0) {
1867 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
1868 if (errmsg_pos > 0) {
1869 if (optuio->uio_segflg == UIO_SYSSPACE)
1871 optuio->uio_iov[errmsg_pos].iov_base,
1875 optuio->uio_iov[errmsg_pos].iov_base,
1882 free(ip4, M_PRISON);
1885 free(ip6, M_PRISON);
1888 free(g_path, M_TEMP);
1895 * struct jail_get_args {
1896 * struct iovec *iovp;
1897 * unsigned int iovcnt;
1902 sys_jail_get(struct thread *td, struct jail_get_args *uap)
1907 /* Check that we have an even number of iovecs. */
1908 if (uap->iovcnt & 1)
1911 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
1914 error = kern_jail_get(td, auio, uap->flags);
1916 error = copyout(auio->uio_iov, uap->iovp,
1917 uap->iovcnt * sizeof (struct iovec));
1923 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
1925 struct prison *pr, *mypr;
1927 struct vfsoptlist *opts;
1928 char *errmsg, *name;
1929 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos;
1931 if (flags & ~JAIL_GET_MASK)
1934 /* Get the parameter list. */
1935 error = vfs_buildopts(optuio, &opts);
1938 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
1939 mypr = td->td_ucred->cr_prison;
1942 * Find the prison specified by one of: lastjid, jid, name.
1944 sx_slock(&allprison_lock);
1945 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
1947 TAILQ_FOREACH(pr, &allprison, pr_list) {
1948 if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
1949 mtx_lock(&pr->pr_mtx);
1950 if (pr->pr_ref > 0 &&
1951 (pr->pr_uref > 0 || (flags & JAIL_DYING)))
1953 mtx_unlock(&pr->pr_mtx);
1959 vfs_opterror(opts, "no jail after %d", jid);
1960 goto done_unlock_list;
1961 } else if (error != ENOENT)
1962 goto done_unlock_list;
1964 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
1967 pr = prison_find_child(mypr, jid);
1969 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1970 mtx_unlock(&pr->pr_mtx);
1972 vfs_opterror(opts, "jail %d is dying",
1974 goto done_unlock_list;
1979 vfs_opterror(opts, "jail %d not found", jid);
1980 goto done_unlock_list;
1982 } else if (error != ENOENT)
1983 goto done_unlock_list;
1985 error = vfs_getopt(opts, "name", (void **)&name, &len);
1987 if (len == 0 || name[len - 1] != '\0') {
1989 goto done_unlock_list;
1991 pr = prison_find_name(mypr, name);
1993 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1994 mtx_unlock(&pr->pr_mtx);
1996 vfs_opterror(opts, "jail \"%s\" is dying",
1998 goto done_unlock_list;
2003 vfs_opterror(opts, "jail \"%s\" not found", name);
2004 goto done_unlock_list;
2005 } else if (error != ENOENT)
2006 goto done_unlock_list;
2008 vfs_opterror(opts, "no jail specified");
2010 goto done_unlock_list;
2013 /* Get the parameters of the prison. */
2016 td->td_retval[0] = pr->pr_id;
2017 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
2018 if (error != 0 && error != ENOENT)
2020 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
2021 error = vfs_setopt(opts, "parent", &i, sizeof(i));
2022 if (error != 0 && error != ENOENT)
2024 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
2025 if (error != 0 && error != ENOENT)
2027 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
2028 sizeof(pr->pr_cpuset->cs_id));
2029 if (error != 0 && error != ENOENT)
2031 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
2032 if (error != 0 && error != ENOENT)
2035 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
2036 pr->pr_ip4s * sizeof(*pr->pr_ip4));
2037 if (error != 0 && error != ENOENT)
2041 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
2042 pr->pr_ip6s * sizeof(*pr->pr_ip6));
2043 if (error != 0 && error != ENOENT)
2046 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
2047 sizeof(pr->pr_securelevel));
2048 if (error != 0 && error != ENOENT)
2050 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
2051 sizeof(pr->pr_childcount));
2052 if (error != 0 && error != ENOENT)
2054 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
2055 sizeof(pr->pr_childmax));
2056 if (error != 0 && error != ENOENT)
2058 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
2059 if (error != 0 && error != ENOENT)
2061 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
2062 if (error != 0 && error != ENOENT)
2064 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
2065 if (error != 0 && error != ENOENT)
2067 #ifdef COMPAT_FREEBSD32
2068 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
2069 uint32_t hid32 = pr->pr_hostid;
2071 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
2074 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
2075 sizeof(pr->pr_hostid));
2076 if (error != 0 && error != ENOENT)
2078 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
2079 sizeof(pr->pr_enforce_statfs));
2080 if (error != 0 && error != ENOENT)
2082 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
2083 sizeof(pr->pr_devfs_rsnum));
2084 if (error != 0 && error != ENOENT)
2086 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
2088 if (pr_flag_names[fi] == NULL)
2090 i = (pr->pr_flags & (1 << fi)) ? 1 : 0;
2091 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i));
2092 if (error != 0 && error != ENOENT)
2095 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i));
2096 if (error != 0 && error != ENOENT)
2099 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
2102 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
2103 i = pr_flag_jailsys[fi].disable &&
2104 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE
2105 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW
2108 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i));
2109 if (error != 0 && error != ENOENT)
2112 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
2114 if (pr_allow_names[fi] == NULL)
2116 i = (pr->pr_allow & (1 << fi)) ? 1 : 0;
2117 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i));
2118 if (error != 0 && error != ENOENT)
2121 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i));
2122 if (error != 0 && error != ENOENT)
2125 i = (pr->pr_uref == 0);
2126 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2127 if (error != 0 && error != ENOENT)
2130 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2131 if (error != 0 && error != ENOENT)
2134 /* Get the module parameters. */
2135 mtx_unlock(&pr->pr_mtx);
2137 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2140 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
2142 /* By now, all parameters should have been noted. */
2143 TAILQ_FOREACH(opt, opts, link) {
2144 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2146 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2151 /* Write the fetched parameters back to userspace. */
2153 TAILQ_FOREACH(opt, opts, link) {
2154 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2155 pos = 2 * opt->pos + 1;
2156 optuio->uio_iov[pos].iov_len = opt->len;
2157 if (opt->value != NULL) {
2158 if (optuio->uio_segflg == UIO_SYSSPACE) {
2160 optuio->uio_iov[pos].iov_base,
2163 error = copyout(opt->value,
2164 optuio->uio_iov[pos].iov_base,
2175 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
2179 sx_sunlock(&allprison_lock);
2181 if (error && errmsg_pos >= 0) {
2182 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2183 errmsg_pos = 2 * errmsg_pos + 1;
2184 if (errmsg_len > 0) {
2185 if (optuio->uio_segflg == UIO_SYSSPACE)
2187 optuio->uio_iov[errmsg_pos].iov_base,
2191 optuio->uio_iov[errmsg_pos].iov_base,
2201 * struct jail_remove_args {
2206 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
2208 struct prison *pr, *cpr, *lpr, *tpr;
2211 error = priv_check(td, PRIV_JAIL_REMOVE);
2215 sx_xlock(&allprison_lock);
2216 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2218 sx_xunlock(&allprison_lock);
2222 /* Remove all descendants of this prison, then remove this prison. */
2224 pr->pr_flags |= PR_REMOVE;
2225 if (!LIST_EMPTY(&pr->pr_children)) {
2226 mtx_unlock(&pr->pr_mtx);
2228 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
2229 mtx_lock(&cpr->pr_mtx);
2230 if (cpr->pr_ref > 0) {
2233 cpr->pr_flags |= PR_REMOVE;
2235 /* Already removed - do not do it again. */
2238 mtx_unlock(&cpr->pr_mtx);
2240 mtx_lock(&lpr->pr_mtx);
2241 prison_remove_one(lpr);
2242 sx_xlock(&allprison_lock);
2247 mtx_lock(&lpr->pr_mtx);
2248 prison_remove_one(lpr);
2249 sx_xlock(&allprison_lock);
2251 mtx_lock(&pr->pr_mtx);
2253 prison_remove_one(pr);
2258 prison_remove_one(struct prison *pr)
2263 /* If the prison was persistent, it is not anymore. */
2265 if (pr->pr_flags & PR_PERSIST) {
2268 pr->pr_flags &= ~PR_PERSIST;
2272 * jail_remove added a reference. If that's the only one, remove
2275 KASSERT(pr->pr_ref > 0,
2276 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
2277 if (pr->pr_ref == 1) {
2279 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
2283 mtx_unlock(&pr->pr_mtx);
2284 sx_xunlock(&allprison_lock);
2286 * Kill all processes unfortunate enough to be attached to this prison.
2288 sx_slock(&allproc_lock);
2289 LIST_FOREACH(p, &allproc, p_list) {
2291 if (p->p_state != PRS_NEW && p->p_ucred &&
2292 p->p_ucred->cr_prison == pr)
2293 kern_psignal(p, SIGKILL);
2296 sx_sunlock(&allproc_lock);
2297 /* Remove the temporary reference added by jail_remove. */
2298 prison_deref(pr, deuref | PD_DEREF);
2303 * struct jail_attach_args {
2308 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
2313 error = priv_check(td, PRIV_JAIL_ATTACH);
2317 sx_slock(&allprison_lock);
2318 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2320 sx_sunlock(&allprison_lock);
2325 * Do not allow a process to attach to a prison that is not
2326 * considered to be "alive".
2328 if (pr->pr_uref == 0) {
2329 mtx_unlock(&pr->pr_mtx);
2330 sx_sunlock(&allprison_lock);
2334 return (do_jail_attach(td, pr));
2338 do_jail_attach(struct thread *td, struct prison *pr)
2342 struct ucred *newcred, *oldcred;
2343 int vfslocked, error;
2346 * XXX: Note that there is a slight race here if two threads
2347 * in the same privileged process attempt to attach to two
2348 * different jails at the same time. It is important for
2349 * user processes not to do this, or they might end up with
2350 * a process root from one prison, but attached to the jail
2355 mtx_unlock(&pr->pr_mtx);
2357 /* Let modules do whatever they need to prepare for attaching. */
2358 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
2360 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
2363 sx_sunlock(&allprison_lock);
2366 * Reparent the newly attached process to this jail.
2368 ppr = td->td_ucred->cr_prison;
2370 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
2374 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
2375 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
2376 if ((error = change_dir(pr->pr_root, td)) != 0)
2379 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
2382 VOP_UNLOCK(pr->pr_root, 0);
2383 if ((error = change_root(pr->pr_root, td)))
2384 goto e_unlock_giant;
2385 VFS_UNLOCK_GIANT(vfslocked);
2389 oldcred = p->p_ucred;
2391 crcopy(newcred, oldcred);
2392 newcred->cr_prison = pr;
2393 p->p_ucred = newcred;
2396 racct_proc_ucred_changed(p, oldcred, newcred);
2399 prison_deref(ppr, PD_DEREF | PD_DEUREF);
2402 VOP_UNLOCK(pr->pr_root, 0);
2404 VFS_UNLOCK_GIANT(vfslocked);
2406 /* Tell modules this thread is still in its old jail after all. */
2407 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td);
2408 prison_deref(pr, PD_DEREF | PD_DEUREF);
2414 * Returns a locked prison instance, or NULL on failure.
2417 prison_find(int prid)
2421 sx_assert(&allprison_lock, SX_LOCKED);
2422 TAILQ_FOREACH(pr, &allprison, pr_list) {
2423 if (pr->pr_id == prid) {
2424 mtx_lock(&pr->pr_mtx);
2427 mtx_unlock(&pr->pr_mtx);
2434 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
2437 prison_find_child(struct prison *mypr, int prid)
2442 sx_assert(&allprison_lock, SX_LOCKED);
2443 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2444 if (pr->pr_id == prid) {
2445 mtx_lock(&pr->pr_mtx);
2448 mtx_unlock(&pr->pr_mtx);
2455 * Look for the name relative to mypr. Returns a locked prison or NULL.
2458 prison_find_name(struct prison *mypr, const char *name)
2460 struct prison *pr, *deadpr;
2464 sx_assert(&allprison_lock, SX_LOCKED);
2465 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
2468 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2469 if (!strcmp(pr->pr_name + mylen, name)) {
2470 mtx_lock(&pr->pr_mtx);
2471 if (pr->pr_ref > 0) {
2472 if (pr->pr_uref > 0)
2476 mtx_unlock(&pr->pr_mtx);
2479 /* There was no valid prison - perhaps there was a dying one. */
2480 if (deadpr != NULL) {
2481 mtx_lock(&deadpr->pr_mtx);
2482 if (deadpr->pr_ref == 0) {
2483 mtx_unlock(&deadpr->pr_mtx);
2491 * See if a prison has the specific flag set.
2494 prison_flag(struct ucred *cred, unsigned flag)
2497 /* This is an atomic read, so no locking is necessary. */
2498 return (cred->cr_prison->pr_flags & flag);
2502 prison_allow(struct ucred *cred, unsigned flag)
2505 /* This is an atomic read, so no locking is necessary. */
2506 return (cred->cr_prison->pr_allow & flag);
2510 * Remove a prison reference. If that was the last reference, remove the
2511 * prison itself - but not in this context in case there are locks held.
2514 prison_free_locked(struct prison *pr)
2517 mtx_assert(&pr->pr_mtx, MA_OWNED);
2519 if (pr->pr_ref == 0) {
2520 mtx_unlock(&pr->pr_mtx);
2521 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
2522 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2525 mtx_unlock(&pr->pr_mtx);
2529 prison_free(struct prison *pr)
2532 mtx_lock(&pr->pr_mtx);
2533 prison_free_locked(pr);
2537 prison_complete(void *context, int pending)
2540 prison_deref((struct prison *)context, 0);
2544 * Remove a prison reference (usually). This internal version assumes no
2545 * mutexes are held, except perhaps the prison itself. If there are no more
2546 * references, release and delist the prison. On completion, the prison lock
2547 * and the allprison lock are both unlocked.
2550 prison_deref(struct prison *pr, int flags)
2552 struct prison *ppr, *tpr;
2555 if (!(flags & PD_LOCKED))
2556 mtx_lock(&pr->pr_mtx);
2558 if (flags & PD_DEUREF) {
2560 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0"));
2562 if (flags & PD_DEREF)
2564 /* If the prison still has references, nothing else to do. */
2565 if (pr->pr_ref > 0) {
2566 mtx_unlock(&pr->pr_mtx);
2567 if (flags & PD_LIST_SLOCKED)
2568 sx_sunlock(&allprison_lock);
2569 else if (flags & PD_LIST_XLOCKED)
2570 sx_xunlock(&allprison_lock);
2574 mtx_unlock(&pr->pr_mtx);
2575 if (flags & PD_LIST_SLOCKED) {
2576 if (!sx_try_upgrade(&allprison_lock)) {
2577 sx_sunlock(&allprison_lock);
2578 sx_xlock(&allprison_lock);
2580 } else if (!(flags & PD_LIST_XLOCKED))
2581 sx_xlock(&allprison_lock);
2583 TAILQ_REMOVE(&allprison, pr, pr_list);
2584 LIST_REMOVE(pr, pr_sibling);
2585 ppr = pr->pr_parent;
2586 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
2587 tpr->pr_childcount--;
2588 sx_xunlock(&allprison_lock);
2591 if (pr->pr_vnet != ppr->pr_vnet)
2592 vnet_destroy(pr->pr_vnet);
2594 if (pr->pr_root != NULL) {
2595 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
2597 VFS_UNLOCK_GIANT(vfslocked);
2599 mtx_destroy(&pr->pr_mtx);
2601 free(pr->pr_ip4, M_PRISON);
2604 free(pr->pr_ip6, M_PRISON);
2606 if (pr->pr_cpuset != NULL)
2607 cpuset_rel(pr->pr_cpuset);
2610 prison_racct_detach(pr);
2614 /* Removing a prison frees a reference on its parent. */
2616 mtx_lock(&pr->pr_mtx);
2617 flags = PD_DEREF | PD_DEUREF;
2622 prison_hold_locked(struct prison *pr)
2625 mtx_assert(&pr->pr_mtx, MA_OWNED);
2626 KASSERT(pr->pr_ref > 0,
2627 ("Trying to hold dead prison (jid=%d).", pr->pr_id));
2632 prison_hold(struct prison *pr)
2635 mtx_lock(&pr->pr_mtx);
2636 prison_hold_locked(pr);
2637 mtx_unlock(&pr->pr_mtx);
2641 prison_proc_hold(struct prison *pr)
2644 mtx_lock(&pr->pr_mtx);
2645 KASSERT(pr->pr_uref > 0,
2646 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
2648 mtx_unlock(&pr->pr_mtx);
2652 prison_proc_free(struct prison *pr)
2655 mtx_lock(&pr->pr_mtx);
2656 KASSERT(pr->pr_uref > 0,
2657 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
2658 prison_deref(pr, PD_DEUREF | PD_LOCKED);
2664 * Restrict a prison's IP address list with its parent's, possibly replacing
2665 * it. Return true if the replacement buffer was used (or would have been).
2668 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
2673 ppr = pr->pr_parent;
2674 if (!(pr->pr_flags & PR_IP4_USER)) {
2675 /* This has no user settings, so just copy the parent's list. */
2676 if (pr->pr_ip4s < ppr->pr_ip4s) {
2678 * There's no room for the parent's list. Use the
2679 * new list buffer, which is assumed to be big enough
2680 * (if it was passed). If there's no buffer, try to
2684 if (newip4 == NULL) {
2685 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
2686 M_PRISON, M_NOWAIT);
2690 if (newip4 != NULL) {
2691 bcopy(ppr->pr_ip4, newip4,
2692 ppr->pr_ip4s * sizeof(*newip4));
2693 free(pr->pr_ip4, M_PRISON);
2694 pr->pr_ip4 = newip4;
2695 pr->pr_ip4s = ppr->pr_ip4s;
2699 pr->pr_ip4s = ppr->pr_ip4s;
2700 if (pr->pr_ip4s > 0)
2701 bcopy(ppr->pr_ip4, pr->pr_ip4,
2702 pr->pr_ip4s * sizeof(*newip4));
2703 else if (pr->pr_ip4 != NULL) {
2704 free(pr->pr_ip4, M_PRISON);
2707 } else if (pr->pr_ip4s > 0) {
2708 /* Remove addresses that aren't in the parent. */
2709 for (ij = 0; ij < ppr->pr_ip4s; ij++)
2710 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
2712 if (ij < ppr->pr_ip4s)
2715 bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
2716 --pr->pr_ip4s * sizeof(*pr->pr_ip4));
2719 for (ij = 1; ii < pr->pr_ip4s; ) {
2720 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
2724 switch (ij >= ppr->pr_ip4s ? -1 :
2725 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
2727 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
2728 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
2739 if (pr->pr_ip4s == 0) {
2740 pr->pr_flags |= PR_IP4_DISABLE;
2741 free(pr->pr_ip4, M_PRISON);
2749 * Pass back primary IPv4 address of this jail.
2751 * If not restricted return success but do not alter the address. Caller has
2752 * to make sure to initialize it correctly (e.g. INADDR_ANY).
2754 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2755 * Address returned in NBO.
2758 prison_get_ip4(struct ucred *cred, struct in_addr *ia)
2762 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2763 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2765 pr = cred->cr_prison;
2766 if (!(pr->pr_flags & PR_IP4))
2768 mtx_lock(&pr->pr_mtx);
2769 if (!(pr->pr_flags & PR_IP4)) {
2770 mtx_unlock(&pr->pr_mtx);
2773 if (pr->pr_ip4 == NULL) {
2774 mtx_unlock(&pr->pr_mtx);
2775 return (EAFNOSUPPORT);
2778 ia->s_addr = pr->pr_ip4[0].s_addr;
2779 mtx_unlock(&pr->pr_mtx);
2784 * Return 1 if we should do proper source address selection or are not jailed.
2785 * We will return 0 if we should bypass source address selection in favour
2786 * of the primary jail IPv4 address. Only in this case *ia will be updated and
2788 * Return EAFNOSUPPORT, in case this jail does not allow IPv4.
2791 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
2797 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2798 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2803 pr = cred->cr_prison;
2804 if (pr->pr_flags & PR_IP4_SADDRSEL)
2807 lia.s_addr = INADDR_ANY;
2808 error = prison_get_ip4(cred, &lia);
2811 if (lia.s_addr == INADDR_ANY)
2814 ia->s_addr = lia.s_addr;
2819 * Return true if pr1 and pr2 have the same IPv4 address restrictions.
2822 prison_equal_ip4(struct prison *pr1, struct prison *pr2)
2829 * No need to lock since the PR_IP4_USER flag can't be altered for
2832 while (pr1 != &prison0 &&
2834 !(pr1->pr_flags & PR_VNET) &&
2836 !(pr1->pr_flags & PR_IP4_USER))
2837 pr1 = pr1->pr_parent;
2838 while (pr2 != &prison0 &&
2840 !(pr2->pr_flags & PR_VNET) &&
2842 !(pr2->pr_flags & PR_IP4_USER))
2843 pr2 = pr2->pr_parent;
2844 return (pr1 == pr2);
2848 * Make sure our (source) address is set to something meaningful to this
2851 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2852 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2853 * doesn't allow IPv4. Address passed in in NBO and returned in NBO.
2856 prison_local_ip4(struct ucred *cred, struct in_addr *ia)
2862 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2863 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2865 pr = cred->cr_prison;
2866 if (!(pr->pr_flags & PR_IP4))
2868 mtx_lock(&pr->pr_mtx);
2869 if (!(pr->pr_flags & PR_IP4)) {
2870 mtx_unlock(&pr->pr_mtx);
2873 if (pr->pr_ip4 == NULL) {
2874 mtx_unlock(&pr->pr_mtx);
2875 return (EAFNOSUPPORT);
2878 ia0.s_addr = ntohl(ia->s_addr);
2879 if (ia0.s_addr == INADDR_LOOPBACK) {
2880 ia->s_addr = pr->pr_ip4[0].s_addr;
2881 mtx_unlock(&pr->pr_mtx);
2885 if (ia0.s_addr == INADDR_ANY) {
2887 * In case there is only 1 IPv4 address, bind directly.
2889 if (pr->pr_ip4s == 1)
2890 ia->s_addr = pr->pr_ip4[0].s_addr;
2891 mtx_unlock(&pr->pr_mtx);
2895 error = _prison_check_ip4(pr, ia);
2896 mtx_unlock(&pr->pr_mtx);
2901 * Rewrite destination address in case we will connect to loopback address.
2903 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2904 * Address passed in in NBO and returned in NBO.
2907 prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
2911 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2912 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2914 pr = cred->cr_prison;
2915 if (!(pr->pr_flags & PR_IP4))
2917 mtx_lock(&pr->pr_mtx);
2918 if (!(pr->pr_flags & PR_IP4)) {
2919 mtx_unlock(&pr->pr_mtx);
2922 if (pr->pr_ip4 == NULL) {
2923 mtx_unlock(&pr->pr_mtx);
2924 return (EAFNOSUPPORT);
2927 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) {
2928 ia->s_addr = pr->pr_ip4[0].s_addr;
2929 mtx_unlock(&pr->pr_mtx);
2934 * Return success because nothing had to be changed.
2936 mtx_unlock(&pr->pr_mtx);
2941 * Check if given address belongs to the jail referenced by cred/prison.
2943 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2944 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2945 * doesn't allow IPv4. Address passed in in NBO.
2948 _prison_check_ip4(struct prison *pr, struct in_addr *ia)
2953 * Check the primary IP.
2955 if (pr->pr_ip4[0].s_addr == ia->s_addr)
2959 * All the other IPs are sorted so we can do a binary search.
2962 z = pr->pr_ip4s - 2;
2965 d = qcmp_v4(&pr->pr_ip4[i+1], ia);
2974 return (EADDRNOTAVAIL);
2978 prison_check_ip4(struct ucred *cred, struct in_addr *ia)
2983 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2984 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2986 pr = cred->cr_prison;
2987 if (!(pr->pr_flags & PR_IP4))
2989 mtx_lock(&pr->pr_mtx);
2990 if (!(pr->pr_flags & PR_IP4)) {
2991 mtx_unlock(&pr->pr_mtx);
2994 if (pr->pr_ip4 == NULL) {
2995 mtx_unlock(&pr->pr_mtx);
2996 return (EAFNOSUPPORT);
2999 error = _prison_check_ip4(pr, ia);
3000 mtx_unlock(&pr->pr_mtx);
3007 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
3012 ppr = pr->pr_parent;
3013 if (!(pr->pr_flags & PR_IP6_USER)) {
3014 /* This has no user settings, so just copy the parent's list. */
3015 if (pr->pr_ip6s < ppr->pr_ip6s) {
3017 * There's no room for the parent's list. Use the
3018 * new list buffer, which is assumed to be big enough
3019 * (if it was passed). If there's no buffer, try to
3023 if (newip6 == NULL) {
3024 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
3025 M_PRISON, M_NOWAIT);
3029 if (newip6 != NULL) {
3030 bcopy(ppr->pr_ip6, newip6,
3031 ppr->pr_ip6s * sizeof(*newip6));
3032 free(pr->pr_ip6, M_PRISON);
3033 pr->pr_ip6 = newip6;
3034 pr->pr_ip6s = ppr->pr_ip6s;
3038 pr->pr_ip6s = ppr->pr_ip6s;
3039 if (pr->pr_ip6s > 0)
3040 bcopy(ppr->pr_ip6, pr->pr_ip6,
3041 pr->pr_ip6s * sizeof(*newip6));
3042 else if (pr->pr_ip6 != NULL) {
3043 free(pr->pr_ip6, M_PRISON);
3046 } else if (pr->pr_ip6s > 0) {
3047 /* Remove addresses that aren't in the parent. */
3048 for (ij = 0; ij < ppr->pr_ip6s; ij++)
3049 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
3052 if (ij < ppr->pr_ip6s)
3055 bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
3056 --pr->pr_ip6s * sizeof(*pr->pr_ip6));
3059 for (ij = 1; ii < pr->pr_ip6s; ) {
3060 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
3065 switch (ij >= ppr->pr_ip6s ? -1 :
3066 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
3068 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
3069 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
3080 if (pr->pr_ip6s == 0) {
3081 pr->pr_flags |= PR_IP6_DISABLE;
3082 free(pr->pr_ip6, M_PRISON);
3090 * Pass back primary IPv6 address for this jail.
3092 * If not restricted return success but do not alter the address. Caller has
3093 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
3095 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3098 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
3102 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3103 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3105 pr = cred->cr_prison;
3106 if (!(pr->pr_flags & PR_IP6))
3108 mtx_lock(&pr->pr_mtx);
3109 if (!(pr->pr_flags & PR_IP6)) {
3110 mtx_unlock(&pr->pr_mtx);
3113 if (pr->pr_ip6 == NULL) {
3114 mtx_unlock(&pr->pr_mtx);
3115 return (EAFNOSUPPORT);
3118 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3119 mtx_unlock(&pr->pr_mtx);
3124 * Return 1 if we should do proper source address selection or are not jailed.
3125 * We will return 0 if we should bypass source address selection in favour
3126 * of the primary jail IPv6 address. Only in this case *ia will be updated and
3128 * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
3131 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
3134 struct in6_addr lia6;
3137 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3138 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3143 pr = cred->cr_prison;
3144 if (pr->pr_flags & PR_IP6_SADDRSEL)
3148 error = prison_get_ip6(cred, &lia6);
3151 if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
3154 bcopy(&lia6, ia6, sizeof(struct in6_addr));
3159 * Return true if pr1 and pr2 have the same IPv6 address restrictions.
3162 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
3168 while (pr1 != &prison0 &&
3170 !(pr1->pr_flags & PR_VNET) &&
3172 !(pr1->pr_flags & PR_IP6_USER))
3173 pr1 = pr1->pr_parent;
3174 while (pr2 != &prison0 &&
3176 !(pr2->pr_flags & PR_VNET) &&
3178 !(pr2->pr_flags & PR_IP6_USER))
3179 pr2 = pr2->pr_parent;
3180 return (pr1 == pr2);
3184 * Make sure our (source) address is set to something meaningful to this jail.
3186 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
3187 * when needed while binding.
3189 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3190 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3191 * doesn't allow IPv6.
3194 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
3199 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3200 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3202 pr = cred->cr_prison;
3203 if (!(pr->pr_flags & PR_IP6))
3205 mtx_lock(&pr->pr_mtx);
3206 if (!(pr->pr_flags & PR_IP6)) {
3207 mtx_unlock(&pr->pr_mtx);
3210 if (pr->pr_ip6 == NULL) {
3211 mtx_unlock(&pr->pr_mtx);
3212 return (EAFNOSUPPORT);
3215 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3216 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3217 mtx_unlock(&pr->pr_mtx);
3221 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
3223 * In case there is only 1 IPv6 address, and v6only is true,
3224 * then bind directly.
3226 if (v6only != 0 && pr->pr_ip6s == 1)
3227 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3228 mtx_unlock(&pr->pr_mtx);
3232 error = _prison_check_ip6(pr, ia6);
3233 mtx_unlock(&pr->pr_mtx);
3238 * Rewrite destination address in case we will connect to loopback address.
3240 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3243 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
3247 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3248 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3250 pr = cred->cr_prison;
3251 if (!(pr->pr_flags & PR_IP6))
3253 mtx_lock(&pr->pr_mtx);
3254 if (!(pr->pr_flags & PR_IP6)) {
3255 mtx_unlock(&pr->pr_mtx);
3258 if (pr->pr_ip6 == NULL) {
3259 mtx_unlock(&pr->pr_mtx);
3260 return (EAFNOSUPPORT);
3263 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3264 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3265 mtx_unlock(&pr->pr_mtx);
3270 * Return success because nothing had to be changed.
3272 mtx_unlock(&pr->pr_mtx);
3277 * Check if given address belongs to the jail referenced by cred/prison.
3279 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3280 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3281 * doesn't allow IPv6.
3284 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6)
3289 * Check the primary IP.
3291 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
3295 * All the other IPs are sorted so we can do a binary search.
3298 z = pr->pr_ip6s - 2;
3301 d = qcmp_v6(&pr->pr_ip6[i+1], ia6);
3310 return (EADDRNOTAVAIL);
3314 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6)
3319 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3320 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3322 pr = cred->cr_prison;
3323 if (!(pr->pr_flags & PR_IP6))
3325 mtx_lock(&pr->pr_mtx);
3326 if (!(pr->pr_flags & PR_IP6)) {
3327 mtx_unlock(&pr->pr_mtx);
3330 if (pr->pr_ip6 == NULL) {
3331 mtx_unlock(&pr->pr_mtx);
3332 return (EAFNOSUPPORT);
3335 error = _prison_check_ip6(pr, ia6);
3336 mtx_unlock(&pr->pr_mtx);
3342 * Check if a jail supports the given address family.
3344 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
3348 prison_check_af(struct ucred *cred, int af)
3353 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3355 pr = cred->cr_prison;
3357 /* Prisons with their own network stack are not limited. */
3358 if (prison_owns_vnet(cred))
3367 if (pr->pr_flags & PR_IP4)
3369 mtx_lock(&pr->pr_mtx);
3370 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
3371 error = EAFNOSUPPORT;
3372 mtx_unlock(&pr->pr_mtx);
3378 if (pr->pr_flags & PR_IP6)
3380 mtx_lock(&pr->pr_mtx);
3381 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
3382 error = EAFNOSUPPORT;
3383 mtx_unlock(&pr->pr_mtx);
3391 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
3392 error = EAFNOSUPPORT;
3398 * Check if given address belongs to the jail referenced by cred (wrapper to
3399 * prison_check_ip[46]).
3401 * Returns 0 if jail doesn't restrict the address family or if address belongs
3402 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
3403 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
3406 prison_if(struct ucred *cred, struct sockaddr *sa)
3409 struct sockaddr_in *sai;
3412 struct sockaddr_in6 *sai6;
3416 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3417 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
3420 if (prison_owns_vnet(cred))
3425 switch (sa->sa_family)
3429 sai = (struct sockaddr_in *)sa;
3430 error = prison_check_ip4(cred, &sai->sin_addr);
3435 sai6 = (struct sockaddr_in6 *)sa;
3436 error = prison_check_ip6(cred, &sai6->sin6_addr);
3440 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
3441 error = EAFNOSUPPORT;
3447 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
3450 prison_check(struct ucred *cred1, struct ucred *cred2)
3453 return ((cred1->cr_prison == cred2->cr_prison ||
3454 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
3458 * Return 1 if p2 is a child of p1, otherwise 0.
3461 prison_ischild(struct prison *pr1, struct prison *pr2)
3464 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
3471 * Return 1 if the passed credential is in a jail, otherwise 0.
3474 jailed(struct ucred *cred)
3477 return (cred->cr_prison != &prison0);
3481 * Return 1 if the passed credential is in a jail and that jail does not
3482 * have its own virtual network stack, otherwise 0.
3485 jailed_without_vnet(struct ucred *cred)
3491 if (prison_owns_vnet(cred))
3499 * Return the correct hostname (domainname, et al) for the passed credential.
3502 getcredhostname(struct ucred *cred, char *buf, size_t size)
3507 * A NULL credential can be used to shortcut to the physical
3508 * system's hostname.
3510 pr = (cred != NULL) ? cred->cr_prison : &prison0;
3511 mtx_lock(&pr->pr_mtx);
3512 strlcpy(buf, pr->pr_hostname, size);
3513 mtx_unlock(&pr->pr_mtx);
3517 getcreddomainname(struct ucred *cred, char *buf, size_t size)
3520 mtx_lock(&cred->cr_prison->pr_mtx);
3521 strlcpy(buf, cred->cr_prison->pr_domainname, size);
3522 mtx_unlock(&cred->cr_prison->pr_mtx);
3526 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
3529 mtx_lock(&cred->cr_prison->pr_mtx);
3530 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
3531 mtx_unlock(&cred->cr_prison->pr_mtx);
3535 getcredhostid(struct ucred *cred, unsigned long *hostid)
3538 mtx_lock(&cred->cr_prison->pr_mtx);
3539 *hostid = cred->cr_prison->pr_hostid;
3540 mtx_unlock(&cred->cr_prison->pr_mtx);
3545 * Determine whether the prison represented by cred owns
3546 * its vnet rather than having it inherited.
3548 * Returns 1 in case the prison owns the vnet, 0 otherwise.
3551 prison_owns_vnet(struct ucred *cred)
3555 * vnets cannot be added/removed after jail creation,
3556 * so no need to lock here.
3558 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
3563 * Determine whether the subject represented by cred can "see"
3564 * status of a mount point.
3565 * Returns: 0 for permitted, ENOENT otherwise.
3566 * XXX: This function should be called cr_canseemount() and should be
3567 * placed in kern_prot.c.
3570 prison_canseemount(struct ucred *cred, struct mount *mp)
3576 pr = cred->cr_prison;
3577 if (pr->pr_enforce_statfs == 0)
3579 if (pr->pr_root->v_mount == mp)
3581 if (pr->pr_enforce_statfs == 2)
3584 * If jail's chroot directory is set to "/" we should be able to see
3585 * all mount-points from inside a jail.
3586 * This is ugly check, but this is the only situation when jail's
3587 * directory ends with '/'.
3589 if (strcmp(pr->pr_path, "/") == 0)
3591 len = strlen(pr->pr_path);
3593 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
3596 * Be sure that we don't have situation where jail's root directory
3597 * is "/some/path" and mount point is "/some/pathpath".
3599 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
3605 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
3607 char jpath[MAXPATHLEN];
3611 pr = cred->cr_prison;
3612 if (pr->pr_enforce_statfs == 0)
3614 if (prison_canseemount(cred, mp) != 0) {
3615 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3616 strlcpy(sp->f_mntonname, "[restricted]",
3617 sizeof(sp->f_mntonname));
3620 if (pr->pr_root->v_mount == mp) {
3622 * Clear current buffer data, so we are sure nothing from
3623 * the valid path left there.
3625 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3626 *sp->f_mntonname = '/';
3630 * If jail's chroot directory is set to "/" we should be able to see
3631 * all mount-points from inside a jail.
3633 if (strcmp(pr->pr_path, "/") == 0)
3635 len = strlen(pr->pr_path);
3636 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
3638 * Clear current buffer data, so we are sure nothing from
3639 * the valid path left there.
3641 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3642 if (*jpath == '\0') {
3643 /* Should never happen. */
3644 *sp->f_mntonname = '/';
3646 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
3651 * Check with permission for a specific privilege is granted within jail. We
3652 * have a specific list of accepted privileges; the rest are denied.
3655 prison_priv_check(struct ucred *cred, int priv)
3663 * Privileges specific to prisons with a virtual network stack.
3664 * There might be a duplicate entry here in case the privilege
3665 * is only granted conditionally in the legacy jail case.
3670 * NFS-specific privileges.
3672 case PRIV_NFS_DAEMON:
3673 case PRIV_NFS_LOCKD:
3676 * Network stack privileges.
3678 case PRIV_NET_BRIDGE:
3681 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
3682 case PRIV_NET_ROUTE:
3684 case PRIV_NET_SETIFMTU:
3685 case PRIV_NET_SETIFFLAGS:
3686 case PRIV_NET_SETIFCAP:
3687 case PRIV_NET_SETIFDESCR:
3688 case PRIV_NET_SETIFNAME :
3689 case PRIV_NET_SETIFMETRIC:
3690 case PRIV_NET_SETIFPHYS:
3691 case PRIV_NET_SETIFMAC:
3692 case PRIV_NET_ADDMULTI:
3693 case PRIV_NET_DELMULTI:
3694 case PRIV_NET_HWIOCTL:
3695 case PRIV_NET_SETLLADDR:
3696 case PRIV_NET_ADDIFGROUP:
3697 case PRIV_NET_DELIFGROUP:
3698 case PRIV_NET_IFCREATE:
3699 case PRIV_NET_IFDESTROY:
3700 case PRIV_NET_ADDIFADDR:
3701 case PRIV_NET_DELIFADDR:
3704 case PRIV_NET_SETIFVNET:
3705 case PRIV_NET_SETIFFIB:
3708 * 802.11-related privileges.
3710 case PRIV_NET80211_GETKEY:
3712 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */
3717 * AppleTalk privileges.
3719 case PRIV_NETATALK_RESERVEDPORT:
3724 case PRIV_NETATM_CFG:
3725 case PRIV_NETATM_ADD:
3726 case PRIV_NETATM_DEL:
3727 case PRIV_NETATM_SET:
3730 * Bluetooth privileges.
3732 case PRIV_NETBLUETOOTH_RAW:
3736 * Netgraph and netgraph module privileges.
3738 case PRIV_NETGRAPH_CONTROL:
3740 case PRIV_NETGRAPH_TTY:
3744 * IPv4 and IPv6 privileges.
3746 case PRIV_NETINET_IPFW:
3747 case PRIV_NETINET_DIVERT:
3748 case PRIV_NETINET_PF:
3749 case PRIV_NETINET_DUMMYNET:
3750 case PRIV_NETINET_CARP:
3751 case PRIV_NETINET_MROUTE:
3752 case PRIV_NETINET_RAW:
3753 case PRIV_NETINET_ADDRCTRL6:
3754 case PRIV_NETINET_ND6:
3755 case PRIV_NETINET_SCOPE6:
3756 case PRIV_NETINET_ALIFETIME6:
3757 case PRIV_NETINET_IPSEC:
3758 case PRIV_NETINET_BINDANY:
3762 * IPX/SPX privileges.
3764 case PRIV_NETIPX_RESERVEDPORT:
3765 case PRIV_NETIPX_RAW:
3779 * No default: or deny here.
3780 * In case of no permit fall through to next switch().
3782 if (cred->cr_prison->pr_flags & PR_VNET)
3790 * Allow ktrace privileges for root in jail.
3796 * Allow jailed processes to configure audit identity and
3797 * submit audit records (login, etc). In the future we may
3798 * want to further refine the relationship between audit and
3801 case PRIV_AUDIT_GETAUDIT:
3802 case PRIV_AUDIT_SETAUDIT:
3803 case PRIV_AUDIT_SUBMIT:
3807 * Allow jailed processes to manipulate process UNIX
3808 * credentials in any way they see fit.
3810 case PRIV_CRED_SETUID:
3811 case PRIV_CRED_SETEUID:
3812 case PRIV_CRED_SETGID:
3813 case PRIV_CRED_SETEGID:
3814 case PRIV_CRED_SETGROUPS:
3815 case PRIV_CRED_SETREUID:
3816 case PRIV_CRED_SETREGID:
3817 case PRIV_CRED_SETRESUID:
3818 case PRIV_CRED_SETRESGID:
3821 * Jail implements visibility constraints already, so allow
3822 * jailed root to override uid/gid-based constraints.
3824 case PRIV_SEEOTHERGIDS:
3825 case PRIV_SEEOTHERUIDS:
3828 * Jail implements inter-process debugging limits already, so
3829 * allow jailed root various debugging privileges.
3831 case PRIV_DEBUG_DIFFCRED:
3832 case PRIV_DEBUG_SUGID:
3833 case PRIV_DEBUG_UNPRIV:
3836 * Allow jail to set various resource limits and login
3837 * properties, and for now, exceed process resource limits.
3839 case PRIV_PROC_LIMIT:
3840 case PRIV_PROC_SETLOGIN:
3841 case PRIV_PROC_SETRLIMIT:
3844 * System V and POSIX IPC privileges are granted in jail.
3847 case PRIV_IPC_WRITE:
3848 case PRIV_IPC_ADMIN:
3849 case PRIV_IPC_MSGSIZE:
3853 * Jail operations within a jail work on child jails.
3855 case PRIV_JAIL_ATTACH:
3857 case PRIV_JAIL_REMOVE:
3860 * Jail implements its own inter-process limits, so allow
3861 * root processes in jail to change scheduling on other
3862 * processes in the same jail. Likewise for signalling.
3864 case PRIV_SCHED_DIFFCRED:
3865 case PRIV_SCHED_CPUSET:
3866 case PRIV_SIGNAL_DIFFCRED:
3867 case PRIV_SIGNAL_SUGID:
3870 * Allow jailed processes to write to sysctls marked as jail
3873 case PRIV_SYSCTL_WRITEJAIL:
3876 * Allow root in jail to manage a variety of quota
3877 * properties. These should likely be conditional on a
3878 * configuration option.
3880 case PRIV_VFS_GETQUOTA:
3881 case PRIV_VFS_SETQUOTA:
3884 * Since Jail relies on chroot() to implement file system
3885 * protections, grant many VFS privileges to root in jail.
3886 * Be careful to exclude mount-related and NFS-related
3890 case PRIV_VFS_WRITE:
3891 case PRIV_VFS_ADMIN:
3893 case PRIV_VFS_LOOKUP:
3894 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
3895 case PRIV_VFS_CHFLAGS_DEV:
3896 case PRIV_VFS_CHOWN:
3897 case PRIV_VFS_CHROOT:
3898 case PRIV_VFS_RETAINSUGID:
3899 case PRIV_VFS_FCHROOT:
3901 case PRIV_VFS_SETGID:
3903 case PRIV_VFS_STICKYFILE:
3907 * Depending on the global setting, allow privilege of
3908 * setting system flags.
3910 case PRIV_VFS_SYSFLAGS:
3911 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
3917 * Depending on the global setting, allow privilege of
3918 * mounting/unmounting file systems.
3920 case PRIV_VFS_MOUNT:
3921 case PRIV_VFS_UNMOUNT:
3922 case PRIV_VFS_MOUNT_NONUSER:
3923 case PRIV_VFS_MOUNT_OWNER:
3924 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT &&
3925 cred->cr_prison->pr_enforce_statfs < 2)
3931 * Allow jailed root to bind reserved ports and reuse in-use
3934 case PRIV_NETINET_RESERVEDPORT:
3935 case PRIV_NETINET_REUSEPORT:
3939 * Allow jailed root to set certian IPv4/6 (option) headers.
3941 case PRIV_NETINET_SETHDROPTS:
3945 * Conditionally allow creating raw sockets in jail.
3947 case PRIV_NETINET_RAW:
3948 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
3954 * Since jail implements its own visibility limits on netstat
3955 * sysctls, allow getcred. This allows identd to work in
3958 case PRIV_NETINET_GETCRED:
3962 * Allow jailed root to set loginclass.
3964 case PRIV_PROC_SETLOGINCLASS:
3969 * In all remaining cases, deny the privilege request. This
3970 * includes almost all network privileges, many system
3971 * configuration privileges.
3978 * Return the part of pr2's name that is relative to pr1, or the whole name
3979 * if it does not directly follow.
3983 prison_name(struct prison *pr1, struct prison *pr2)
3987 /* Jails see themselves as "0" (if they see themselves at all). */
3990 name = pr2->pr_name;
3991 if (prison_ischild(pr1, pr2)) {
3993 * pr1 isn't locked (and allprison_lock may not be either)
3994 * so its length can't be counted on. But the number of dots
3995 * can be counted on - and counted.
3997 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
3998 name = strchr(name, '.') + 1;
4004 * Return the part of pr2's path that is relative to pr1, or the whole path
4005 * if it does not directly follow.
4008 prison_path(struct prison *pr1, struct prison *pr2)
4010 char *path1, *path2;
4013 path1 = pr1->pr_path;
4014 path2 = pr2->pr_path;
4015 if (!strcmp(path1, "/"))
4017 len1 = strlen(path1);
4018 if (strncmp(path1, path2, len1))
4020 if (path2[len1] == '\0')
4022 if (path2[len1] == '/')
4023 return (path2 + len1);
4029 * Jail-related sysctls.
4031 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
4035 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
4038 struct prison *pr, *cpr;
4040 struct in_addr *ip4 = NULL;
4044 struct in6_addr *ip6 = NULL;
4049 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
4050 pr = req->td->td_ucred->cr_prison;
4052 sx_slock(&allprison_lock);
4053 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
4054 #if defined(INET) || defined(INET6)
4057 mtx_lock(&cpr->pr_mtx);
4059 if (cpr->pr_ip4s > 0) {
4060 if (ip4s < cpr->pr_ip4s) {
4061 ip4s = cpr->pr_ip4s;
4062 mtx_unlock(&cpr->pr_mtx);
4063 ip4 = realloc(ip4, ip4s *
4064 sizeof(struct in_addr), M_TEMP, M_WAITOK);
4067 bcopy(cpr->pr_ip4, ip4,
4068 cpr->pr_ip4s * sizeof(struct in_addr));
4072 if (cpr->pr_ip6s > 0) {
4073 if (ip6s < cpr->pr_ip6s) {
4074 ip6s = cpr->pr_ip6s;
4075 mtx_unlock(&cpr->pr_mtx);
4076 ip6 = realloc(ip6, ip6s *
4077 sizeof(struct in6_addr), M_TEMP, M_WAITOK);
4080 bcopy(cpr->pr_ip6, ip6,
4081 cpr->pr_ip6s * sizeof(struct in6_addr));
4084 if (cpr->pr_ref == 0) {
4085 mtx_unlock(&cpr->pr_mtx);
4088 bzero(xp, sizeof(*xp));
4089 xp->pr_version = XPRISON_VERSION;
4090 xp->pr_id = cpr->pr_id;
4091 xp->pr_state = cpr->pr_uref > 0
4092 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
4093 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
4094 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
4095 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
4097 xp->pr_ip4s = cpr->pr_ip4s;
4100 xp->pr_ip6s = cpr->pr_ip6s;
4102 mtx_unlock(&cpr->pr_mtx);
4103 error = SYSCTL_OUT(req, xp, sizeof(*xp));
4107 if (xp->pr_ip4s > 0) {
4108 error = SYSCTL_OUT(req, ip4,
4109 xp->pr_ip4s * sizeof(struct in_addr));
4115 if (xp->pr_ip6s > 0) {
4116 error = SYSCTL_OUT(req, ip6,
4117 xp->pr_ip6s * sizeof(struct in6_addr));
4123 sx_sunlock(&allprison_lock);
4134 SYSCTL_OID(_security_jail, OID_AUTO, list,
4135 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4136 sysctl_jail_list, "S", "List of active jails");
4139 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
4143 injail = jailed(req->td->td_ucred);
4144 error = SYSCTL_OUT(req, &injail, sizeof(injail));
4149 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
4150 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4151 sysctl_jail_jailed, "I", "Process in jail?");
4154 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
4156 int error, havevnet;
4158 struct ucred *cred = req->td->td_ucred;
4160 havevnet = jailed(cred) && prison_owns_vnet(cred);
4164 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
4169 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
4170 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4171 sysctl_jail_vnet, "I", "Jail owns VNET?");
4173 #if defined(INET) || defined(INET6)
4174 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
4175 &jail_max_af_ips, 0,
4176 "Number of IP addresses a jail may have at most per address family");
4180 * Default parameters for jail(2) compatability. For historical reasons,
4181 * the sysctl names have varying similarity to the parameter names. Prisons
4182 * just see their own parameters, and can't change them.
4185 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
4188 int allow, error, i;
4190 pr = req->td->td_ucred->cr_prison;
4191 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
4193 /* Get the current flag value, and convert it to a boolean. */
4194 i = (allow & arg2) ? 1 : 0;
4197 error = sysctl_handle_int(oidp, &i, 0, req);
4198 if (error || !req->newptr)
4204 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
4207 mtx_lock(&prison0.pr_mtx);
4208 jail_default_allow = (jail_default_allow & ~arg2) | i;
4209 mtx_unlock(&prison0.pr_mtx);
4213 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
4214 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4215 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
4216 "Processes in jail can set their hostnames");
4217 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
4218 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4219 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
4220 "Processes in jail are limited to creating UNIX/IP/route sockets only");
4221 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
4222 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4223 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
4224 "Processes in jail can use System V IPC primitives");
4225 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
4226 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4227 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
4228 "Prison root can create raw sockets");
4229 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
4230 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4231 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
4232 "Processes in jail can alter system file flags");
4233 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
4234 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4235 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
4236 "Processes in jail can mount/unmount jail-friendly file systems");
4237 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed,
4238 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4239 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I",
4240 "Processes in jail can mount the devfs file system");
4241 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed,
4242 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4243 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I",
4244 "Processes in jail can mount the nullfs file system");
4245 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed,
4246 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4247 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I",
4248 "Processes in jail can mount the procfs file system");
4249 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed,
4250 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4251 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I",
4252 "Processes in jail can mount the zfs file system");
4255 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
4260 pr = req->td->td_ucred->cr_prison;
4261 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
4262 error = sysctl_handle_int(oidp, &level, 0, req);
4263 if (error || !req->newptr)
4265 *(int *)arg1 = level;
4269 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
4270 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4271 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
4272 sysctl_jail_default_level, "I",
4273 "Processes in jail cannot see all mounted file systems");
4275 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
4276 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
4277 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
4278 sysctl_jail_default_level, "I",
4279 "Ruleset for the devfs filesystem in jail");
4282 * Nodes to describe jail parameters. Maximum length of string parameters
4283 * is returned in the string itself, and the other parameters exist merely
4284 * to make themselves and their types known.
4286 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0,
4290 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
4297 switch (oidp->oid_kind & CTLTYPE)
4303 if (!(req->flags & SCTL_MASK32))
4305 return (SYSCTL_OUT(req, &l, sizeof(l)));
4309 return (SYSCTL_OUT(req, &i, sizeof(i)));
4310 case CTLTYPE_STRING:
4311 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
4313 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
4314 case CTLTYPE_STRUCT:
4316 return (SYSCTL_OUT(req, &s, sizeof(s)));
4321 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
4322 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
4323 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
4324 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
4325 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
4326 "I", "Jail secure level");
4327 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
4328 "I", "Jail cannot see all mounted file systems");
4329 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
4330 "I", "Ruleset for in-jail devfs mounts");
4331 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
4332 "B", "Jail persistence");
4334 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
4335 "E,jailsys", "Virtual network stack");
4337 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
4338 "B", "Jail is in the process of shutting down");
4340 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
4341 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
4342 "I", "Current number of child jails");
4343 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
4344 "I", "Maximum number of child jails");
4346 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
4347 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
4349 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
4350 "Jail NIS domainname");
4351 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
4353 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
4354 "LU", "Jail host ID");
4356 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
4357 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
4360 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
4361 "Jail IPv4 address virtualization");
4362 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
4363 "S,in_addr,a", "Jail IPv4 addresses");
4364 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4365 "B", "Do (not) use IPv4 source address selection rather than the "
4366 "primary jail IPv4 address.");
4369 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
4370 "Jail IPv6 address virtualization");
4371 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
4372 "S,in6_addr,a", "Jail IPv6 addresses");
4373 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4374 "B", "Do (not) use IPv6 source address selection rather than the "
4375 "primary jail IPv6 address.");
4378 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
4379 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
4380 "B", "Jail may set hostname");
4381 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
4382 "B", "Jail may use SYSV IPC");
4383 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
4384 "B", "Jail may create raw sockets");
4385 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
4386 "B", "Jail may alter system file flags");
4387 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
4388 "B", "Jail may set file quotas");
4389 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
4390 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
4392 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
4393 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
4394 "B", "Jail may mount/unmount jail-friendly file systems in general");
4395 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW,
4396 "B", "Jail may mount the devfs file system");
4397 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW,
4398 "B", "Jail may mount the nullfs file system");
4399 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW,
4400 "B", "Jail may mount the procfs file system");
4401 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW,
4402 "B", "Jail may mount the zfs file system");
4405 prison_racct_foreach(void (*callback)(struct racct *racct,
4406 void *arg2, void *arg3), void *arg2, void *arg3)
4408 struct prison_racct *prr;
4410 sx_slock(&allprison_lock);
4411 LIST_FOREACH(prr, &allprison_racct, prr_next)
4412 (callback)(prr->prr_racct, arg2, arg3);
4413 sx_sunlock(&allprison_lock);
4416 static struct prison_racct *
4417 prison_racct_find_locked(const char *name)
4419 struct prison_racct *prr;
4421 sx_assert(&allprison_lock, SA_XLOCKED);
4423 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
4426 LIST_FOREACH(prr, &allprison_racct, prr_next) {
4427 if (strcmp(name, prr->prr_name) != 0)
4430 /* Found prison_racct with a matching name? */
4431 prison_racct_hold(prr);
4435 /* Add new prison_racct. */
4436 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
4437 racct_create(&prr->prr_racct);
4439 strcpy(prr->prr_name, name);
4440 refcount_init(&prr->prr_refcount, 1);
4441 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
4446 struct prison_racct *
4447 prison_racct_find(const char *name)
4449 struct prison_racct *prr;
4451 sx_xlock(&allprison_lock);
4452 prr = prison_racct_find_locked(name);
4453 sx_xunlock(&allprison_lock);
4458 prison_racct_hold(struct prison_racct *prr)
4461 refcount_acquire(&prr->prr_refcount);
4465 prison_racct_free_locked(struct prison_racct *prr)
4468 sx_assert(&allprison_lock, SA_XLOCKED);
4470 if (refcount_release(&prr->prr_refcount)) {
4471 racct_destroy(&prr->prr_racct);
4472 LIST_REMOVE(prr, prr_next);
4473 free(prr, M_PRISON_RACCT);
4478 prison_racct_free(struct prison_racct *prr)
4482 sx_assert(&allprison_lock, SA_UNLOCKED);
4484 old = prr->prr_refcount;
4485 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1))
4488 sx_xlock(&allprison_lock);
4489 prison_racct_free_locked(prr);
4490 sx_xunlock(&allprison_lock);
4495 prison_racct_attach(struct prison *pr)
4497 struct prison_racct *prr;
4499 sx_assert(&allprison_lock, SA_XLOCKED);
4501 prr = prison_racct_find_locked(pr->pr_name);
4502 KASSERT(prr != NULL, ("cannot find prison_racct"));
4504 pr->pr_prison_racct = prr;
4508 * Handle jail renaming. From the racct point of view, renaming means
4509 * moving from one prison_racct to another.
4512 prison_racct_modify(struct prison *pr)
4516 struct prison_racct *oldprr;
4518 sx_slock(&allproc_lock);
4519 sx_xlock(&allprison_lock);
4521 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
4522 sx_xunlock(&allprison_lock);
4523 sx_sunlock(&allproc_lock);
4527 oldprr = pr->pr_prison_racct;
4528 pr->pr_prison_racct = NULL;
4530 prison_racct_attach(pr);
4533 * Move resource utilisation records.
4535 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
4538 * Force rctl to reattach rules to processes.
4540 FOREACH_PROC_IN_SYSTEM(p) {
4542 cred = crhold(p->p_ucred);
4544 racct_proc_ucred_changed(p, cred, cred);
4548 sx_sunlock(&allproc_lock);
4549 prison_racct_free_locked(oldprr);
4550 sx_xunlock(&allprison_lock);
4554 prison_racct_detach(struct prison *pr)
4557 sx_assert(&allprison_lock, SA_UNLOCKED);
4559 if (pr->pr_prison_racct == NULL)
4561 prison_racct_free(pr->pr_prison_racct);
4562 pr->pr_prison_racct = NULL;
4569 db_show_prison(struct prison *pr)
4572 #if defined(INET) || defined(INET6)
4577 char ip6buf[INET6_ADDRSTRLEN];
4580 db_printf("prison %p:\n", pr);
4581 db_printf(" jid = %d\n", pr->pr_id);
4582 db_printf(" name = %s\n", pr->pr_name);
4583 db_printf(" parent = %p\n", pr->pr_parent);
4584 db_printf(" ref = %d\n", pr->pr_ref);
4585 db_printf(" uref = %d\n", pr->pr_uref);
4586 db_printf(" path = %s\n", pr->pr_path);
4587 db_printf(" cpuset = %d\n", pr->pr_cpuset
4588 ? pr->pr_cpuset->cs_id : -1);
4590 db_printf(" vnet = %p\n", pr->pr_vnet);
4592 db_printf(" root = %p\n", pr->pr_root);
4593 db_printf(" securelevel = %d\n", pr->pr_securelevel);
4594 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
4595 db_printf(" children.max = %d\n", pr->pr_childmax);
4596 db_printf(" children.cur = %d\n", pr->pr_childcount);
4597 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
4598 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
4599 db_printf(" flags = 0x%x", pr->pr_flags);
4600 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
4602 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi)))
4603 db_printf(" %s", pr_flag_names[fi]);
4604 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
4606 jsf = pr->pr_flags &
4607 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
4608 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name,
4609 pr_flag_jailsys[fi].disable &&
4610 (jsf == pr_flag_jailsys[fi].disable) ? "disable"
4611 : (jsf == pr_flag_jailsys[fi].new) ? "new"
4614 db_printf(" allow = 0x%x", pr->pr_allow);
4615 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
4617 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi)))
4618 db_printf(" %s", pr_allow_names[fi]);
4620 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
4621 db_printf(" host.hostname = %s\n", pr->pr_hostname);
4622 db_printf(" host.domainname = %s\n", pr->pr_domainname);
4623 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
4624 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
4626 db_printf(" ip4s = %d\n", pr->pr_ip4s);
4627 for (ii = 0; ii < pr->pr_ip4s; ii++)
4628 db_printf(" %s %s\n",
4629 ii == 0 ? "ip4.addr =" : " ",
4630 inet_ntoa(pr->pr_ip4[ii]));
4633 db_printf(" ip6s = %d\n", pr->pr_ip6s);
4634 for (ii = 0; ii < pr->pr_ip6s; ii++)
4635 db_printf(" %s %s\n",
4636 ii == 0 ? "ip6.addr =" : " ",
4637 ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
4641 DB_SHOW_COMMAND(prison, db_show_prison_command)
4647 * Show all prisons in the list, and prison0 which is not
4650 db_show_prison(&prison0);
4651 if (!db_pager_quit) {
4652 TAILQ_FOREACH(pr, &allprison, pr_list) {
4664 /* Look for a prison with the ID and with references. */
4665 TAILQ_FOREACH(pr, &allprison, pr_list)
4666 if (pr->pr_id == addr && pr->pr_ref > 0)
4669 /* Look again, without requiring a reference. */
4670 TAILQ_FOREACH(pr, &allprison, pr_list)
4671 if (pr->pr_id == addr)
4674 /* Assume address points to a valid prison. */
4675 pr = (struct prison *)addr;