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>
73 #include <security/mac/mac_framework.h>
75 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000"
77 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
78 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures");
80 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */
83 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
85 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
89 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
91 #define _PR_IP_SADDRSEL 0
95 /* prison0 describes what is "real" about the system. */
96 struct prison prison0 = {
102 .pr_securelevel = -1,
104 .pr_childmax = JAIL_MAX,
105 .pr_hostuuid = DEFAULT_HOSTUUID,
106 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
108 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
110 .pr_flags = PR_HOST|_PR_IP_SADDRSEL,
112 .pr_allow = PR_ALLOW_ALL,
114 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
116 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */
117 struct sx allprison_lock;
118 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
119 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
120 LIST_HEAD(, prison_racct) allprison_racct;
123 static int do_jail_attach(struct thread *td, struct prison *pr);
124 static void prison_complete(void *context, int pending);
125 static void prison_deref(struct prison *pr, int flags);
126 static char *prison_path(struct prison *pr1, struct prison *pr2);
127 static void prison_remove_one(struct prison *pr);
129 static void prison_racct_attach(struct prison *pr);
130 static void prison_racct_modify(struct prison *pr);
131 static void prison_racct_detach(struct prison *pr);
134 /* Flags for prison_deref */
135 #define PD_DEREF 0x01
136 #define PD_DEUREF 0x02
137 #define PD_LOCKED 0x04
138 #define PD_LIST_SLOCKED 0x08
139 #define PD_LIST_XLOCKED 0x10
142 * Parameter names corresponding to PR_* flag values. Size values are for kvm
143 * as we cannot figure out the size of a sparse array, or an array without a
146 static char *pr_flag_names[] = {
149 [7] = "ip4.saddrsel",
152 [8] = "ip6.saddrsel",
155 const size_t pr_flag_names_size = sizeof(pr_flag_names);
157 static char *pr_flag_nonames[] = {
160 [7] = "ip4.nosaddrsel",
163 [8] = "ip6.nosaddrsel",
166 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames);
168 struct jailsys_flags {
172 } pr_flag_jailsys[] = {
173 { "host", 0, PR_HOST },
175 { "vnet", 0, PR_VNET },
178 { "ip4", PR_IP4_USER, PR_IP4_USER },
181 { "ip6", PR_IP6_USER, PR_IP6_USER },
184 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
186 static char *pr_allow_names[] = {
187 "allow.set_hostname",
195 "allow.mount.nullfs",
197 "allow.mount.procfs",
199 "allow.mount.fdescfs",
200 "allow.mount.linprocfs",
201 "allow.mount.linsysfs",
203 const size_t pr_allow_names_size = sizeof(pr_allow_names);
205 static char *pr_allow_nonames[] = {
206 "allow.noset_hostname",
208 "allow.noraw_sockets",
213 "allow.mount.nodevfs",
214 "allow.mount.nonullfs",
216 "allow.mount.noprocfs",
217 "allow.mount.notmpfs",
218 "allow.mount.nofdescfs",
219 "allow.mount.nolinprocfs",
220 "allow.mount.nolinsysfs",
222 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames);
224 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME
225 #define JAIL_DEFAULT_ENFORCE_STATFS 2
226 #define JAIL_DEFAULT_DEVFS_RSNUM 0
227 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
228 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
229 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
230 #if defined(INET) || defined(INET6)
231 static unsigned jail_max_af_ips = 255;
235 * Initialize the parts of prison0 that can't be static-initialized with
236 * constants. This is called from proc0_init() after creating thread0 cpuset.
242 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset);
243 prison0.pr_osreldate = osreldate;
244 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease));
253 sys_jail(struct thread *td, struct jail_args *uap)
259 error = copyin(uap->jail, &version, sizeof(uint32_t));
268 /* FreeBSD single IPv4 jails. */
269 bzero(&j, sizeof(struct jail));
270 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
273 j.version = j0.version;
275 j.hostname = j0.hostname;
276 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */
282 * Version 1 was used by multi-IPv4 jail implementations
283 * that never made it into the official kernel.
287 case 2: /* JAIL_API_VERSION */
288 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
289 error = copyin(uap->jail, &j, sizeof(struct jail));
295 /* Sci-Fi jails are not supported, sorry. */
298 return (kern_jail(td, &j));
302 kern_jail(struct thread *td, struct jail *j)
304 struct iovec optiov[2 * (4 + nitems(pr_allow_names)
313 char *u_path, *u_hostname, *u_name;
316 struct in_addr *u_ip4;
319 struct in6_addr *u_ip6;
322 int error, enforce_statfs, fi;
324 bzero(&optiov, sizeof(optiov));
325 opt.uio_iov = optiov;
329 opt.uio_segflg = UIO_SYSSPACE;
330 opt.uio_rw = UIO_READ;
333 /* Set permissions for top-level jails from sysctls. */
334 if (!jailed(td->td_ucred)) {
335 for (fi = 0; fi < nitems(pr_allow_names); fi++) {
336 optiov[opt.uio_iovcnt].iov_base =
337 (jail_default_allow & (1 << fi))
338 ? pr_allow_names[fi] : pr_allow_nonames[fi];
339 optiov[opt.uio_iovcnt].iov_len =
340 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
343 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
344 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
346 enforce_statfs = jail_default_enforce_statfs;
347 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
348 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
352 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
354 ip4s = (j->version == 0) ? 1 : j->ip4s;
355 if (ip4s > jail_max_af_ips)
357 tmplen += ip4s * sizeof(struct in_addr);
363 if (j->ip6s > jail_max_af_ips)
365 tmplen += j->ip6s * sizeof(struct in6_addr);
370 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
371 u_hostname = u_path + MAXPATHLEN;
372 u_name = u_hostname + MAXHOSTNAMELEN;
374 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
378 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
380 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
383 optiov[opt.uio_iovcnt].iov_base = "path";
384 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
386 optiov[opt.uio_iovcnt].iov_base = u_path;
387 error = copyinstr(j->path, u_path, MAXPATHLEN,
388 &optiov[opt.uio_iovcnt].iov_len);
390 free(u_path, M_TEMP);
394 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
395 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
397 optiov[opt.uio_iovcnt].iov_base = u_hostname;
398 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
399 &optiov[opt.uio_iovcnt].iov_len);
401 free(u_path, M_TEMP);
405 if (j->jailname != NULL) {
406 optiov[opt.uio_iovcnt].iov_base = "name";
407 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
409 optiov[opt.uio_iovcnt].iov_base = u_name;
410 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
411 &optiov[opt.uio_iovcnt].iov_len);
413 free(u_path, M_TEMP);
419 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
420 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
422 optiov[opt.uio_iovcnt].iov_base = u_ip4;
423 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
425 u_ip4->s_addr = j->ip4s;
427 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
429 free(u_path, M_TEMP);
436 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
437 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
439 optiov[opt.uio_iovcnt].iov_base = u_ip6;
440 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
441 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
443 free(u_path, M_TEMP);
448 KASSERT(opt.uio_iovcnt <= nitems(optiov),
449 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
450 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
451 free(u_path, M_TEMP);
457 * struct jail_set_args {
458 * struct iovec *iovp;
459 * unsigned int iovcnt;
464 sys_jail_set(struct thread *td, struct jail_set_args *uap)
469 /* Check that we have an even number of iovecs. */
473 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
476 error = kern_jail_set(td, auio, uap->flags);
482 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
489 struct in6_addr *ip6;
492 struct vfsoptlist *opts;
493 struct prison *pr, *deadpr, *mypr, *ppr, *tpr;
495 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
496 char *g_path, *osrelstr;
497 #if defined(INET) || defined(INET6)
502 size_t namelen, onamelen, pnamelen;
503 int born, created, cuflags, descend, enforce;
504 int error, errmsg_len, errmsg_pos;
505 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
506 int fi, jid, jsys, len, level;
507 int childmax, osreldt, rsnum, slevel;
508 int fullpath_disabled;
509 #if defined(INET) || defined(INET6)
518 uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
522 error = priv_check(td, PRIV_JAIL_SET);
523 if (!error && (flags & JAIL_ATTACH))
524 error = priv_check(td, PRIV_JAIL_ATTACH);
527 mypr = td->td_ucred->cr_prison;
528 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
530 if (flags & ~JAIL_SET_MASK)
534 * Check all the parameters before committing to anything. Not all
535 * errors can be caught early, but we may as well try. Also, this
536 * takes care of some expensive stuff (path lookup) before getting
537 * the allprison lock.
539 * XXX Jails are not filesystems, and jail parameters are not mount
540 * options. But it makes more sense to re-use the vfsopt code
541 * than duplicate it under a different name.
543 error = vfs_buildopts(optuio, &opts);
554 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
557 vfs_opterror(opts, "no valid operation (create or update)");
561 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
567 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
576 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
584 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
589 else if (enforce < 0 || enforce > 2) {
595 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
603 pr_flags = ch_flags = 0;
604 for (fi = 0; fi < nitems(pr_flag_names); fi++) {
605 if (pr_flag_names[fi] == NULL)
607 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi);
608 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi);
610 ch_flags |= pr_flags;
611 for (fi = 0; fi < nitems(pr_flag_jailsys); fi++) {
612 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys,
619 case JAIL_SYS_DISABLE:
620 if (!pr_flag_jailsys[fi].disable) {
624 pr_flags |= pr_flag_jailsys[fi].disable;
627 pr_flags |= pr_flag_jailsys[fi].new;
629 case JAIL_SYS_INHERIT:
636 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable;
638 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE
639 && !(pr_flags & PR_PERSIST)) {
641 vfs_opterror(opts, "new jail must persist or attach");
645 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
647 vfs_opterror(opts, "vnet cannot be changed after creation");
652 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
654 vfs_opterror(opts, "ip4 cannot be changed after creation");
659 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
661 vfs_opterror(opts, "ip6 cannot be changed after creation");
666 pr_allow = ch_allow = 0;
667 for (fi = 0; fi < nitems(pr_allow_names); fi++) {
668 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi);
669 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi);
671 ch_allow |= pr_allow;
673 error = vfs_getopt(opts, "name", (void **)&name, &len);
679 if (len == 0 || name[len - 1] != '\0') {
683 if (len > MAXHOSTNAMELEN) {
684 error = ENAMETOOLONG;
689 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
697 if (len == 0 || host[len - 1] != '\0') {
701 if (len > MAXHOSTNAMELEN) {
702 error = ENAMETOOLONG;
707 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
715 if (len == 0 || domain[len - 1] != '\0') {
719 if (len > MAXHOSTNAMELEN) {
720 error = ENAMETOOLONG;
725 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
733 if (len == 0 || uuid[len - 1] != '\0') {
737 if (len > HOSTUUIDLEN) {
738 error = ENAMETOOLONG;
743 #ifdef COMPAT_FREEBSD32
744 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
747 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
751 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
763 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
768 else if (ip4s & (sizeof(*ip4) - 1)) {
772 ch_flags |= PR_IP4_USER;
773 pr_flags |= PR_IP4_USER;
775 ip4s /= sizeof(*ip4);
776 if (ip4s > jail_max_af_ips) {
778 vfs_opterror(opts, "too many IPv4 addresses");
781 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
782 bcopy(op, ip4, ip4s * sizeof(*ip4));
784 * IP addresses are all sorted but ip[0] to preserve
785 * the primary IP address as given from userland.
786 * This special IP is used for unbound outgoing
787 * connections as well for "loopback" traffic in case
788 * source address selection cannot find any more fitting
789 * address to connect from.
792 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4),
795 * Check for duplicate addresses and do some simple
796 * zero and broadcast checks. If users give other bogus
797 * addresses it is their problem.
799 * We do not have to care about byte order for these
800 * checks so we will do them in NBO.
802 for (ii = 0; ii < ip4s; ii++) {
803 if (ip4[ii].s_addr == INADDR_ANY ||
804 ip4[ii].s_addr == INADDR_BROADCAST) {
809 (ip4[0].s_addr == ip4[ii+1].s_addr ||
810 ip4[ii].s_addr == ip4[ii+1].s_addr)) {
820 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
825 else if (ip6s & (sizeof(*ip6) - 1)) {
829 ch_flags |= PR_IP6_USER;
830 pr_flags |= PR_IP6_USER;
832 ip6s /= sizeof(*ip6);
833 if (ip6s > jail_max_af_ips) {
835 vfs_opterror(opts, "too many IPv6 addresses");
838 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
839 bcopy(op, ip6, ip6s * sizeof(*ip6));
841 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6),
843 for (ii = 0; ii < ip6s; ii++) {
844 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
849 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
850 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
860 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
861 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
864 "vnet jails cannot have IP address restrictions");
869 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len);
875 if (flags & JAIL_UPDATE) {
878 "osrelease cannot be changed after creation");
881 if (len == 0 || len >= OSRELEASELEN) {
884 "osrelease string must be 1-%d bytes long",
890 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt));
896 if (flags & JAIL_UPDATE) {
899 "osreldate cannot be changed after creation");
904 vfs_opterror(opts, "osreldate cannot be 0");
909 fullpath_disabled = 0;
911 error = vfs_getopt(opts, "path", (void **)&path, &len);
917 if (flags & JAIL_UPDATE) {
920 "path cannot be changed after creation");
923 if (len == 0 || path[len - 1] != '\0') {
927 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
933 NDFREE(&nd, NDF_ONLY_PNBUF);
934 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
935 strlcpy(g_path, path, MAXPATHLEN);
936 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
939 else if (error == ENODEV) {
940 /* proceed if sysctl debug.disablefullpath == 1 */
941 fullpath_disabled = 1;
942 if (len < 2 || (len == 2 && path[0] == '/'))
945 /* exit on other errors */
948 if (root->v_type != VDIR) {
954 if (fullpath_disabled) {
955 /* Leave room for a real-root full pathname. */
956 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/")
957 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) {
958 error = ENAMETOOLONG;
966 * Find the specified jail, or at least its parent.
967 * This abuses the file error codes ENOENT and EEXIST.
971 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
972 namelc = strrchr(name, '.');
973 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
977 sx_xlock(&allprison_lock);
980 * See if a requested jid already exists. There is an
981 * information leak here if the jid exists but is not within
982 * the caller's jail hierarchy. Jail creators will get EEXIST
983 * even though they cannot see the jail, and CREATE | UPDATE
984 * will return ENOENT which is not normally a valid error.
988 vfs_opterror(opts, "negative jid");
989 goto done_unlock_list;
991 pr = prison_find(jid);
994 /* Create: jid must not exist. */
995 if (cuflags == JAIL_CREATE) {
996 mtx_unlock(&pr->pr_mtx);
998 vfs_opterror(opts, "jail %d already exists",
1000 goto done_unlock_list;
1002 if (!prison_ischild(mypr, pr)) {
1003 mtx_unlock(&pr->pr_mtx);
1005 } else if (pr->pr_uref == 0) {
1006 if (!(flags & JAIL_DYING)) {
1007 mtx_unlock(&pr->pr_mtx);
1009 vfs_opterror(opts, "jail %d is dying",
1011 goto done_unlock_list;
1012 } else if ((flags & JAIL_ATTACH) ||
1013 (pr_flags & PR_PERSIST)) {
1015 * A dying jail might be resurrected
1016 * (via attach or persist), but first
1017 * it must determine if another jail
1018 * has claimed its name. Accomplish
1019 * this by implicitly re-setting the
1023 name = prison_name(mypr, pr);
1028 /* Update: jid must exist. */
1029 if (cuflags == JAIL_UPDATE) {
1031 vfs_opterror(opts, "jail %d not found", jid);
1032 goto done_unlock_list;
1037 * If the caller provided a name, look for a jail by that name.
1038 * This has different semantics for creates and updates keyed by jid
1039 * (where the name must not already exist in a different jail),
1040 * and updates keyed by the name itself (where the name must exist
1041 * because that is the jail being updated).
1045 namelc = strrchr(name, '.');
1050 * This is a hierarchical name. Split it into the
1051 * parent and child names, and make sure the parent
1052 * exists or matches an already found jail.
1055 if (strncmp(name, ppr->pr_name, namelc - name)
1056 || ppr->pr_name[namelc - name] != '\0') {
1057 mtx_unlock(&pr->pr_mtx);
1060 "cannot change jail's parent");
1061 goto done_unlock_list;
1065 ppr = prison_find_name(mypr, name);
1069 "jail \"%s\" not found", name);
1070 goto done_unlock_list;
1072 mtx_unlock(&ppr->pr_mtx);
1077 if (namelc[0] != '\0') {
1079 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1082 FOREACH_PRISON_CHILD(ppr, tpr) {
1083 if (tpr != pr && tpr->pr_ref > 0 &&
1084 !strcmp(tpr->pr_name + pnamelen, namelc)) {
1086 cuflags != JAIL_CREATE) {
1087 mtx_lock(&tpr->pr_mtx);
1088 if (tpr->pr_ref > 0) {
1093 if (tpr->pr_uref > 0) {
1099 mtx_unlock(&tpr->pr_mtx);
1100 } else if (tpr->pr_uref > 0) {
1102 * Create, or update(jid):
1103 * name must not exist in an
1104 * active sibling jail.
1108 mtx_unlock(&pr->pr_mtx);
1110 "jail \"%s\" already exists",
1112 goto done_unlock_list;
1116 /* If no active jail is found, use a dying one. */
1117 if (deadpr != NULL && pr == NULL) {
1118 if (flags & JAIL_DYING) {
1119 mtx_lock(&deadpr->pr_mtx);
1120 if (deadpr->pr_ref == 0) {
1121 mtx_unlock(&deadpr->pr_mtx);
1125 } else if (cuflags == JAIL_UPDATE) {
1128 "jail \"%s\" is dying", name);
1129 goto done_unlock_list;
1132 /* Update: name must exist if no jid. */
1133 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1135 vfs_opterror(opts, "jail \"%s\" not found",
1137 goto done_unlock_list;
1141 /* Update: must provide a jid or name. */
1142 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1144 vfs_opterror(opts, "update specified no jail");
1145 goto done_unlock_list;
1148 /* If there's no prison to update, create a new one and link it in. */
1150 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1151 if (tpr->pr_childcount >= tpr->pr_childmax) {
1153 vfs_opterror(opts, "prison limit exceeded");
1154 goto done_unlock_list;
1157 mtx_lock(&ppr->pr_mtx);
1158 if (ppr->pr_ref == 0) {
1159 mtx_unlock(&ppr->pr_mtx);
1161 vfs_opterror(opts, "jail \"%s\" not found",
1162 prison_name(mypr, ppr));
1163 goto done_unlock_list;
1167 mtx_unlock(&ppr->pr_mtx);
1168 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1170 /* Find the next free jid. */
1173 if (jid == JAIL_MAX)
1175 TAILQ_FOREACH(tpr, &allprison, pr_list) {
1176 if (tpr->pr_id < jid)
1178 if (tpr->pr_id > jid || tpr->pr_ref == 0) {
1179 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1182 if (jid == lastprid) {
1185 "no available jail IDs");
1187 prison_deref(ppr, PD_DEREF |
1188 PD_DEUREF | PD_LIST_XLOCKED);
1197 * The jail already has a jid (that did not yet exist),
1198 * so just find where to insert it.
1200 TAILQ_FOREACH(tpr, &allprison, pr_list)
1201 if (tpr->pr_id >= jid) {
1202 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1207 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1208 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1209 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1210 tpr->pr_childcount++;
1212 pr->pr_parent = ppr;
1215 /* Set some default values, and inherit some from the parent. */
1220 root = mypr->pr_root;
1223 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1224 pr->pr_flags |= PR_HOST;
1225 #if defined(INET) || defined(INET6)
1227 if (!(pr_flags & PR_VNET))
1231 if (!(ch_flags & PR_IP4_USER))
1232 pr->pr_flags |= PR_IP4 | PR_IP4_USER;
1233 else if (!(pr_flags & PR_IP4_USER)) {
1234 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1235 if (ppr->pr_ip4 != NULL) {
1236 pr->pr_ip4s = ppr->pr_ip4s;
1237 pr->pr_ip4 = malloc(pr->pr_ip4s *
1238 sizeof(struct in_addr), M_PRISON,
1240 bcopy(ppr->pr_ip4, pr->pr_ip4,
1241 pr->pr_ip4s * sizeof(*pr->pr_ip4));
1246 if (!(ch_flags & PR_IP6_USER))
1247 pr->pr_flags |= PR_IP6 | PR_IP6_USER;
1248 else if (!(pr_flags & PR_IP6_USER)) {
1249 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1250 if (ppr->pr_ip6 != NULL) {
1251 pr->pr_ip6s = ppr->pr_ip6s;
1252 pr->pr_ip6 = malloc(pr->pr_ip6s *
1253 sizeof(struct in6_addr), M_PRISON,
1255 bcopy(ppr->pr_ip6, pr->pr_ip6,
1256 pr->pr_ip6s * sizeof(*pr->pr_ip6));
1262 /* Source address selection is always on by default. */
1263 pr->pr_flags |= _PR_IP_SADDRSEL;
1265 pr->pr_securelevel = ppr->pr_securelevel;
1266 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1267 pr->pr_enforce_statfs = jail_default_enforce_statfs;
1268 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
1270 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate;
1271 if (osrelstr == NULL)
1272 strcpy(pr->pr_osrelease, ppr->pr_osrelease);
1274 strcpy(pr->pr_osrelease, osrelstr);
1276 LIST_INIT(&pr->pr_children);
1277 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1278 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
1281 /* Allocate a new vnet if specified. */
1282 pr->pr_vnet = (pr_flags & PR_VNET)
1283 ? vnet_alloc() : ppr->pr_vnet;
1286 * Allocate a dedicated cpuset for each jail.
1287 * Unlike other initial settings, this may return an erorr.
1289 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1291 prison_deref(pr, PD_LIST_XLOCKED);
1295 mtx_lock(&pr->pr_mtx);
1297 * New prisons do not yet have a reference, because we do not
1298 * want others to see the incomplete prison once the
1299 * allprison_lock is downgraded.
1304 * Grab a reference for existing prisons, to ensure they
1305 * continue to exist for the duration of the call.
1308 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1309 if ((pr->pr_flags & PR_VNET) &&
1310 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1313 "vnet jails cannot have IP address restrictions");
1314 goto done_deref_locked;
1318 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1321 "ip4 cannot be changed after creation");
1322 goto done_deref_locked;
1326 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1329 "ip6 cannot be changed after creation");
1330 goto done_deref_locked;
1335 /* Do final error checking before setting anything. */
1337 if (slevel < ppr->pr_securelevel) {
1339 goto done_deref_locked;
1343 if (childmax >= ppr->pr_childmax) {
1345 goto done_deref_locked;
1349 if (enforce < ppr->pr_enforce_statfs) {
1351 goto done_deref_locked;
1356 * devfs_rsnum is a uint16_t
1358 if (rsnum < 0 || rsnum > 65535) {
1360 goto done_deref_locked;
1363 * Nested jails always inherit parent's devfs ruleset
1365 if (jailed(td->td_ucred)) {
1366 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
1368 goto done_deref_locked;
1370 rsnum = ppr->pr_devfs_rsnum;
1375 if (ppr->pr_flags & PR_IP4) {
1377 * Make sure the new set of IP addresses is a
1378 * subset of the parent's list. Don't worry
1379 * about the parent being unlocked, as any
1380 * setting is done with allprison_lock held.
1382 for (ij = 0; ij < ppr->pr_ip4s; ij++)
1383 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
1385 if (ij == ppr->pr_ip4s) {
1387 goto done_deref_locked;
1390 for (ii = ij = 1; ii < ip4s; ii++) {
1391 if (ip4[ii].s_addr ==
1392 ppr->pr_ip4[0].s_addr)
1394 for (; ij < ppr->pr_ip4s; ij++)
1395 if (ip4[ii].s_addr ==
1396 ppr->pr_ip4[ij].s_addr)
1398 if (ij == ppr->pr_ip4s)
1401 if (ij == ppr->pr_ip4s) {
1403 goto done_deref_locked;
1408 * Check for conflicting IP addresses. We permit them
1409 * if there is no more than one IP on each jail. If
1410 * there is a duplicate on a jail with more than one
1411 * IP stop checking and return error.
1415 for (; tppr != &prison0; tppr = tppr->pr_parent)
1416 if (tppr->pr_flags & PR_VNET)
1419 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1422 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1424 tpr->pr_uref == 0) {
1428 if (!(tpr->pr_flags & PR_IP4_USER))
1431 if (tpr->pr_ip4 == NULL ||
1432 (ip4s == 1 && tpr->pr_ip4s == 1))
1434 for (ii = 0; ii < ip4s; ii++) {
1435 if (prison_check_ip4_locked(tpr, &ip4[ii]) ==
1439 "IPv4 addresses clash");
1440 goto done_deref_locked;
1448 if (ppr->pr_flags & PR_IP6) {
1450 * Make sure the new set of IP addresses is a
1451 * subset of the parent's list.
1453 for (ij = 0; ij < ppr->pr_ip6s; ij++)
1454 if (IN6_ARE_ADDR_EQUAL(&ip6[0],
1457 if (ij == ppr->pr_ip6s) {
1459 goto done_deref_locked;
1462 for (ii = ij = 1; ii < ip6s; ii++) {
1463 if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
1466 for (; ij < ppr->pr_ip6s; ij++)
1467 if (IN6_ARE_ADDR_EQUAL(
1468 &ip6[ii], &ppr->pr_ip6[ij]))
1470 if (ij == ppr->pr_ip6s)
1473 if (ij == ppr->pr_ip6s) {
1475 goto done_deref_locked;
1479 /* Check for conflicting IP addresses. */
1482 for (; tppr != &prison0; tppr = tppr->pr_parent)
1483 if (tppr->pr_flags & PR_VNET)
1486 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1489 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1491 tpr->pr_uref == 0) {
1495 if (!(tpr->pr_flags & PR_IP6_USER))
1498 if (tpr->pr_ip6 == NULL ||
1499 (ip6s == 1 && tpr->pr_ip6s == 1))
1501 for (ii = 0; ii < ip6s; ii++) {
1502 if (prison_check_ip6_locked(tpr, &ip6[ii]) ==
1506 "IPv6 addresses clash");
1507 goto done_deref_locked;
1513 onamelen = namelen = 0;
1514 if (namelc != NULL) {
1515 /* Give a default name of the jid. Also allow the name to be
1516 * explicitly the jid - but not any other number, and only in
1517 * normal form (no leading zero/etc).
1519 if (namelc[0] == '\0')
1520 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid);
1521 else if ((strtoul(namelc, &p, 10) != jid ||
1522 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') {
1525 "name cannot be numeric (unless it is the jid)");
1526 goto done_deref_locked;
1529 * Make sure the name isn't too long for the prison or its
1532 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1533 onamelen = strlen(pr->pr_name + pnamelen);
1534 namelen = strlen(namelc);
1535 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) {
1536 error = ENAMETOOLONG;
1537 goto done_deref_locked;
1539 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1540 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
1541 sizeof(pr->pr_name)) {
1542 error = ENAMETOOLONG;
1543 goto done_deref_locked;
1547 if (pr_allow & ~ppr->pr_allow) {
1549 goto done_deref_locked;
1553 * Let modules check their parameters. This requires unlocking and
1554 * then re-locking the prison, but this is still a valid state as long
1555 * as allprison_lock remains xlocked.
1557 mtx_unlock(&pr->pr_mtx);
1558 error = osd_jail_call(pr, PR_METHOD_CHECK, opts);
1560 prison_deref(pr, created
1562 : PD_DEREF | PD_LIST_XLOCKED);
1565 mtx_lock(&pr->pr_mtx);
1567 /* At this point, all valid parameters should have been noted. */
1568 TAILQ_FOREACH(opt, opts, link) {
1569 if (!opt->seen && strcmp(opt->name, "errmsg")) {
1571 vfs_opterror(opts, "unknown parameter: %s", opt->name);
1572 goto done_deref_locked;
1576 /* Set the parameters of the prison. */
1579 if (pr_flags & PR_IP4_USER) {
1580 pr->pr_flags |= PR_IP4;
1581 free(pr->pr_ip4, M_PRISON);
1585 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1587 if (tpr->pr_flags & PR_VNET) {
1592 if (prison_restrict_ip4(tpr, NULL)) {
1601 if (pr_flags & PR_IP6_USER) {
1602 pr->pr_flags |= PR_IP6;
1603 free(pr->pr_ip6, M_PRISON);
1607 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1609 if (tpr->pr_flags & PR_VNET) {
1614 if (prison_restrict_ip6(tpr, NULL)) {
1622 pr->pr_securelevel = slevel;
1623 /* Set all child jails to be at least this level. */
1624 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1625 if (tpr->pr_securelevel < slevel)
1626 tpr->pr_securelevel = slevel;
1629 pr->pr_childmax = childmax;
1630 /* Set all child jails to under this limit. */
1631 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
1632 if (tpr->pr_childmax > childmax - level)
1633 tpr->pr_childmax = childmax > level
1634 ? childmax - level : 0;
1637 pr->pr_enforce_statfs = enforce;
1638 /* Pass this restriction on to the children. */
1639 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1640 if (tpr->pr_enforce_statfs < enforce)
1641 tpr->pr_enforce_statfs = enforce;
1644 pr->pr_devfs_rsnum = rsnum;
1645 /* Pass this restriction on to the children. */
1646 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1647 tpr->pr_devfs_rsnum = rsnum;
1649 if (namelc != NULL) {
1650 if (ppr == &prison0)
1651 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name));
1653 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
1654 ppr->pr_name, namelc);
1655 /* Change this component of child names. */
1656 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1657 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
1658 strlen(tpr->pr_name + onamelen) + 1);
1659 bcopy(pr->pr_name, tpr->pr_name, namelen);
1663 /* Try to keep a real-rooted full pathname. */
1664 if (fullpath_disabled && path[0] == '/' &&
1665 strcmp(mypr->pr_path, "/"))
1666 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s",
1667 mypr->pr_path, path);
1669 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
1672 if (PR_HOST & ch_flags & ~pr_flags) {
1673 if (pr->pr_flags & PR_HOST) {
1675 * Copy the parent's host info. As with pr_ip4 above,
1676 * the lack of a lock on the parent is not a problem;
1677 * it is always set with allprison_lock at least
1678 * shared, and is held exclusively here.
1680 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
1681 sizeof(pr->pr_hostname));
1682 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
1683 sizeof(pr->pr_domainname));
1684 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
1685 sizeof(pr->pr_hostuuid));
1686 pr->pr_hostid = pr->pr_parent->pr_hostid;
1688 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
1689 /* Set this prison, and any descendants without PR_HOST. */
1691 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
1693 strlcpy(pr->pr_domainname, domain,
1694 sizeof(pr->pr_domainname));
1696 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
1698 pr->pr_hostid = hid;
1699 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1700 if (tpr->pr_flags & PR_HOST)
1704 strlcpy(tpr->pr_hostname,
1706 sizeof(tpr->pr_hostname));
1708 strlcpy(tpr->pr_domainname,
1710 sizeof(tpr->pr_domainname));
1712 strlcpy(tpr->pr_hostuuid,
1714 sizeof(tpr->pr_hostuuid));
1716 tpr->pr_hostid = hid;
1720 if ((tallow = ch_allow & ~pr_allow)) {
1721 /* Clear allow bits in all children. */
1722 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1723 tpr->pr_allow &= ~tallow;
1725 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
1727 * Persistent prisons get an extra reference, and prisons losing their
1728 * persist flag lose that reference. Only do this for existing prisons
1729 * for now, so new ones will remain unseen until after the module
1730 * handlers have completed.
1732 born = pr->pr_uref == 0;
1733 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) {
1734 if (pr_flags & PR_PERSIST) {
1742 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
1743 mtx_unlock(&pr->pr_mtx);
1746 if (racct_enable && created)
1747 prison_racct_attach(pr);
1750 /* Locks may have prevented a complete restriction of child IP
1751 * addresses. If so, allocate some more memory and try again.
1756 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
1757 mtx_lock(&pr->pr_mtx);
1759 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1761 if (tpr->pr_flags & PR_VNET) {
1766 if (prison_restrict_ip4(tpr, ip4)) {
1773 mtx_unlock(&pr->pr_mtx);
1779 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
1780 mtx_lock(&pr->pr_mtx);
1782 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1784 if (tpr->pr_flags & PR_VNET) {
1789 if (prison_restrict_ip6(tpr, ip6)) {
1796 mtx_unlock(&pr->pr_mtx);
1800 /* Let the modules do their work. */
1801 sx_downgrade(&allprison_lock);
1803 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
1805 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
1806 prison_deref(pr, created
1808 : PD_DEREF | PD_LIST_SLOCKED);
1812 error = osd_jail_call(pr, PR_METHOD_SET, opts);
1815 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
1816 prison_deref(pr, created
1818 : PD_DEREF | PD_LIST_SLOCKED);
1822 /* Attach this process to the prison if requested. */
1823 if (flags & JAIL_ATTACH) {
1824 mtx_lock(&pr->pr_mtx);
1825 error = do_jail_attach(td, pr);
1827 vfs_opterror(opts, "attach failed");
1829 prison_deref(pr, PD_DEREF);
1835 if (racct_enable && !created) {
1836 if (!(flags & JAIL_ATTACH))
1837 sx_sunlock(&allprison_lock);
1838 prison_racct_modify(pr);
1839 if (!(flags & JAIL_ATTACH))
1840 sx_slock(&allprison_lock);
1844 td->td_retval[0] = pr->pr_id;
1847 * Now that it is all there, drop the temporary reference from existing
1848 * prisons. Or add a reference to newly created persistent prisons
1849 * (which was not done earlier so that the prison would not be publicly
1853 prison_deref(pr, (flags & JAIL_ATTACH)
1855 : PD_DEREF | PD_LIST_SLOCKED);
1857 if (pr_flags & PR_PERSIST) {
1858 mtx_lock(&pr->pr_mtx);
1861 mtx_unlock(&pr->pr_mtx);
1863 if (!(flags & JAIL_ATTACH))
1864 sx_sunlock(&allprison_lock);
1870 prison_deref(pr, created
1871 ? PD_LOCKED | PD_LIST_XLOCKED
1872 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
1875 sx_xunlock(&allprison_lock);
1881 if (vfs_getopt(opts, "errmsg", (void **)&errmsg,
1882 &errmsg_len) == 0 && errmsg_len > 0) {
1883 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
1884 if (optuio->uio_segflg == UIO_SYSSPACE)
1886 optuio->uio_iov[errmsg_pos].iov_base,
1890 optuio->uio_iov[errmsg_pos].iov_base,
1896 free(ip4, M_PRISON);
1899 free(ip6, M_PRISON);
1902 free(g_path, M_TEMP);
1909 * struct jail_get_args {
1910 * struct iovec *iovp;
1911 * unsigned int iovcnt;
1916 sys_jail_get(struct thread *td, struct jail_get_args *uap)
1921 /* Check that we have an even number of iovecs. */
1922 if (uap->iovcnt & 1)
1925 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
1928 error = kern_jail_get(td, auio, uap->flags);
1930 error = copyout(auio->uio_iov, uap->iovp,
1931 uap->iovcnt * sizeof (struct iovec));
1937 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
1939 struct prison *pr, *mypr;
1941 struct vfsoptlist *opts;
1942 char *errmsg, *name;
1943 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos;
1945 if (flags & ~JAIL_GET_MASK)
1948 /* Get the parameter list. */
1949 error = vfs_buildopts(optuio, &opts);
1952 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
1953 mypr = td->td_ucred->cr_prison;
1956 * Find the prison specified by one of: lastjid, jid, name.
1958 sx_slock(&allprison_lock);
1959 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
1961 TAILQ_FOREACH(pr, &allprison, pr_list) {
1962 if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
1963 mtx_lock(&pr->pr_mtx);
1964 if (pr->pr_ref > 0 &&
1965 (pr->pr_uref > 0 || (flags & JAIL_DYING)))
1967 mtx_unlock(&pr->pr_mtx);
1973 vfs_opterror(opts, "no jail after %d", jid);
1974 goto done_unlock_list;
1975 } else if (error != ENOENT)
1976 goto done_unlock_list;
1978 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
1981 pr = prison_find_child(mypr, jid);
1983 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1984 mtx_unlock(&pr->pr_mtx);
1986 vfs_opterror(opts, "jail %d is dying",
1988 goto done_unlock_list;
1993 vfs_opterror(opts, "jail %d not found", jid);
1994 goto done_unlock_list;
1996 } else if (error != ENOENT)
1997 goto done_unlock_list;
1999 error = vfs_getopt(opts, "name", (void **)&name, &len);
2001 if (len == 0 || name[len - 1] != '\0') {
2003 goto done_unlock_list;
2005 pr = prison_find_name(mypr, name);
2007 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
2008 mtx_unlock(&pr->pr_mtx);
2010 vfs_opterror(opts, "jail \"%s\" is dying",
2012 goto done_unlock_list;
2017 vfs_opterror(opts, "jail \"%s\" not found", name);
2018 goto done_unlock_list;
2019 } else if (error != ENOENT)
2020 goto done_unlock_list;
2022 vfs_opterror(opts, "no jail specified");
2024 goto done_unlock_list;
2027 /* Get the parameters of the prison. */
2030 td->td_retval[0] = pr->pr_id;
2031 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
2032 if (error != 0 && error != ENOENT)
2034 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
2035 error = vfs_setopt(opts, "parent", &i, sizeof(i));
2036 if (error != 0 && error != ENOENT)
2038 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
2039 if (error != 0 && error != ENOENT)
2041 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
2042 sizeof(pr->pr_cpuset->cs_id));
2043 if (error != 0 && error != ENOENT)
2045 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
2046 if (error != 0 && error != ENOENT)
2049 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
2050 pr->pr_ip4s * sizeof(*pr->pr_ip4));
2051 if (error != 0 && error != ENOENT)
2055 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
2056 pr->pr_ip6s * sizeof(*pr->pr_ip6));
2057 if (error != 0 && error != ENOENT)
2060 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
2061 sizeof(pr->pr_securelevel));
2062 if (error != 0 && error != ENOENT)
2064 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
2065 sizeof(pr->pr_childcount));
2066 if (error != 0 && error != ENOENT)
2068 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
2069 sizeof(pr->pr_childmax));
2070 if (error != 0 && error != ENOENT)
2072 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
2073 if (error != 0 && error != ENOENT)
2075 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
2076 if (error != 0 && error != ENOENT)
2078 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
2079 if (error != 0 && error != ENOENT)
2081 #ifdef COMPAT_FREEBSD32
2082 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
2083 uint32_t hid32 = pr->pr_hostid;
2085 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
2088 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
2089 sizeof(pr->pr_hostid));
2090 if (error != 0 && error != ENOENT)
2092 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
2093 sizeof(pr->pr_enforce_statfs));
2094 if (error != 0 && error != ENOENT)
2096 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
2097 sizeof(pr->pr_devfs_rsnum));
2098 if (error != 0 && error != ENOENT)
2100 for (fi = 0; fi < nitems(pr_flag_names); fi++) {
2101 if (pr_flag_names[fi] == NULL)
2103 i = (pr->pr_flags & (1 << fi)) ? 1 : 0;
2104 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i));
2105 if (error != 0 && error != ENOENT)
2108 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i));
2109 if (error != 0 && error != ENOENT)
2112 for (fi = 0; fi < nitems(pr_flag_jailsys); fi++) {
2114 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
2115 i = pr_flag_jailsys[fi].disable &&
2116 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE
2117 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW
2120 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i));
2121 if (error != 0 && error != ENOENT)
2124 for (fi = 0; fi < nitems(pr_allow_names); fi++) {
2125 if (pr_allow_names[fi] == NULL)
2127 i = (pr->pr_allow & (1 << fi)) ? 1 : 0;
2128 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i));
2129 if (error != 0 && error != ENOENT)
2132 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i));
2133 if (error != 0 && error != ENOENT)
2136 i = (pr->pr_uref == 0);
2137 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2138 if (error != 0 && error != ENOENT)
2141 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2142 if (error != 0 && error != ENOENT)
2144 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate,
2145 sizeof(pr->pr_osreldate));
2146 if (error != 0 && error != ENOENT)
2148 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease);
2149 if (error != 0 && error != ENOENT)
2152 /* Get the module parameters. */
2153 mtx_unlock(&pr->pr_mtx);
2155 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2158 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
2160 /* By now, all parameters should have been noted. */
2161 TAILQ_FOREACH(opt, opts, link) {
2162 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2164 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2169 /* Write the fetched parameters back to userspace. */
2171 TAILQ_FOREACH(opt, opts, link) {
2172 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2173 pos = 2 * opt->pos + 1;
2174 optuio->uio_iov[pos].iov_len = opt->len;
2175 if (opt->value != NULL) {
2176 if (optuio->uio_segflg == UIO_SYSSPACE) {
2178 optuio->uio_iov[pos].iov_base,
2181 error = copyout(opt->value,
2182 optuio->uio_iov[pos].iov_base,
2193 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
2197 sx_sunlock(&allprison_lock);
2199 if (error && errmsg_pos >= 0) {
2200 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2201 errmsg_pos = 2 * errmsg_pos + 1;
2202 if (errmsg_len > 0) {
2203 if (optuio->uio_segflg == UIO_SYSSPACE)
2205 optuio->uio_iov[errmsg_pos].iov_base,
2209 optuio->uio_iov[errmsg_pos].iov_base,
2219 * struct jail_remove_args {
2224 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
2226 struct prison *pr, *cpr, *lpr, *tpr;
2229 error = priv_check(td, PRIV_JAIL_REMOVE);
2233 sx_xlock(&allprison_lock);
2234 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2236 sx_xunlock(&allprison_lock);
2240 /* Remove all descendants of this prison, then remove this prison. */
2242 if (!LIST_EMPTY(&pr->pr_children)) {
2243 mtx_unlock(&pr->pr_mtx);
2245 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
2246 mtx_lock(&cpr->pr_mtx);
2247 if (cpr->pr_ref > 0) {
2251 /* Already removed - do not do it again. */
2254 mtx_unlock(&cpr->pr_mtx);
2256 mtx_lock(&lpr->pr_mtx);
2257 prison_remove_one(lpr);
2258 sx_xlock(&allprison_lock);
2263 mtx_lock(&lpr->pr_mtx);
2264 prison_remove_one(lpr);
2265 sx_xlock(&allprison_lock);
2267 mtx_lock(&pr->pr_mtx);
2269 prison_remove_one(pr);
2274 prison_remove_one(struct prison *pr)
2279 /* If the prison was persistent, it is not anymore. */
2281 if (pr->pr_flags & PR_PERSIST) {
2284 pr->pr_flags &= ~PR_PERSIST;
2288 * jail_remove added a reference. If that's the only one, remove
2291 KASSERT(pr->pr_ref > 0,
2292 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
2293 if (pr->pr_ref == 1) {
2295 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
2299 mtx_unlock(&pr->pr_mtx);
2300 sx_xunlock(&allprison_lock);
2302 * Kill all processes unfortunate enough to be attached to this prison.
2304 sx_slock(&allproc_lock);
2305 LIST_FOREACH(p, &allproc, p_list) {
2307 if (p->p_state != PRS_NEW && p->p_ucred &&
2308 p->p_ucred->cr_prison == pr)
2309 kern_psignal(p, SIGKILL);
2312 sx_sunlock(&allproc_lock);
2313 /* Remove the temporary reference added by jail_remove. */
2314 prison_deref(pr, deuref | PD_DEREF);
2319 * struct jail_attach_args {
2324 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
2329 error = priv_check(td, PRIV_JAIL_ATTACH);
2334 * Start with exclusive hold on allprison_lock to ensure that a possible
2335 * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove.
2336 * But then immediately downgrade it since we don't need to stop
2339 sx_xlock(&allprison_lock);
2340 sx_downgrade(&allprison_lock);
2341 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2343 sx_sunlock(&allprison_lock);
2348 * Do not allow a process to attach to a prison that is not
2349 * considered to be "alive".
2351 if (pr->pr_uref == 0) {
2352 mtx_unlock(&pr->pr_mtx);
2353 sx_sunlock(&allprison_lock);
2357 return (do_jail_attach(td, pr));
2361 do_jail_attach(struct thread *td, struct prison *pr)
2364 struct ucred *newcred, *oldcred;
2368 * XXX: Note that there is a slight race here if two threads
2369 * in the same privileged process attempt to attach to two
2370 * different jails at the same time. It is important for
2371 * user processes not to do this, or they might end up with
2372 * a process root from one prison, but attached to the jail
2377 mtx_unlock(&pr->pr_mtx);
2379 /* Let modules do whatever they need to prepare for attaching. */
2380 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
2382 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
2385 sx_sunlock(&allprison_lock);
2388 * Reparent the newly attached process to this jail.
2391 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
2395 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
2396 if ((error = change_dir(pr->pr_root, td)) != 0)
2399 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
2402 VOP_UNLOCK(pr->pr_root, 0);
2403 if ((error = pwd_chroot(td, pr->pr_root)))
2408 oldcred = crcopysafe(p, newcred);
2409 newcred->cr_prison = pr;
2410 proc_set_cred(p, newcred);
2414 racct_proc_ucred_changed(p, oldcred, newcred);
2416 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF);
2421 VOP_UNLOCK(pr->pr_root, 0);
2423 /* Tell modules this thread is still in its old jail after all. */
2424 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td);
2425 prison_deref(pr, PD_DEREF | PD_DEUREF);
2431 * Returns a locked prison instance, or NULL on failure.
2434 prison_find(int prid)
2438 sx_assert(&allprison_lock, SX_LOCKED);
2439 TAILQ_FOREACH(pr, &allprison, pr_list) {
2440 if (pr->pr_id == prid) {
2441 mtx_lock(&pr->pr_mtx);
2444 mtx_unlock(&pr->pr_mtx);
2451 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
2454 prison_find_child(struct prison *mypr, int prid)
2459 sx_assert(&allprison_lock, SX_LOCKED);
2460 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2461 if (pr->pr_id == prid) {
2462 mtx_lock(&pr->pr_mtx);
2465 mtx_unlock(&pr->pr_mtx);
2472 * Look for the name relative to mypr. Returns a locked prison or NULL.
2475 prison_find_name(struct prison *mypr, const char *name)
2477 struct prison *pr, *deadpr;
2481 sx_assert(&allprison_lock, SX_LOCKED);
2482 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
2485 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2486 if (!strcmp(pr->pr_name + mylen, name)) {
2487 mtx_lock(&pr->pr_mtx);
2488 if (pr->pr_ref > 0) {
2489 if (pr->pr_uref > 0)
2493 mtx_unlock(&pr->pr_mtx);
2496 /* There was no valid prison - perhaps there was a dying one. */
2497 if (deadpr != NULL) {
2498 mtx_lock(&deadpr->pr_mtx);
2499 if (deadpr->pr_ref == 0) {
2500 mtx_unlock(&deadpr->pr_mtx);
2508 * See if a prison has the specific flag set.
2511 prison_flag(struct ucred *cred, unsigned flag)
2514 /* This is an atomic read, so no locking is necessary. */
2515 return (cred->cr_prison->pr_flags & flag);
2519 prison_allow(struct ucred *cred, unsigned flag)
2522 /* This is an atomic read, so no locking is necessary. */
2523 return (cred->cr_prison->pr_allow & flag);
2527 * Remove a prison reference. If that was the last reference, remove the
2528 * prison itself - but not in this context in case there are locks held.
2531 prison_free_locked(struct prison *pr)
2535 mtx_assert(&pr->pr_mtx, MA_OWNED);
2537 mtx_unlock(&pr->pr_mtx);
2539 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2543 prison_free(struct prison *pr)
2546 mtx_lock(&pr->pr_mtx);
2547 prison_free_locked(pr);
2551 * Complete a call to either prison_free or prison_proc_free.
2554 prison_complete(void *context, int pending)
2556 struct prison *pr = context;
2558 sx_xlock(&allprison_lock);
2559 mtx_lock(&pr->pr_mtx);
2560 prison_deref(pr, pr->pr_uref
2561 ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED
2562 : PD_LOCKED | PD_LIST_XLOCKED);
2566 * Remove a prison reference (usually). This internal version assumes no
2567 * mutexes are held, except perhaps the prison itself. If there are no more
2568 * references, release and delist the prison. On completion, the prison lock
2569 * and the allprison lock are both unlocked.
2572 prison_deref(struct prison *pr, int flags)
2574 struct prison *ppr, *tpr;
2577 if (!(flags & PD_LOCKED))
2578 mtx_lock(&pr->pr_mtx);
2580 if (flags & PD_DEUREF) {
2581 KASSERT(pr->pr_uref > 0,
2582 ("prison_deref PD_DEUREF on a dead prison (jid=%d)",
2585 lasturef = pr->pr_uref == 0;
2588 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0"));
2591 if (flags & PD_DEREF) {
2592 KASSERT(pr->pr_ref > 0,
2593 ("prison_deref PD_DEREF on a dead prison (jid=%d)",
2598 mtx_unlock(&pr->pr_mtx);
2601 * Tell the modules if the last user reference was removed
2602 * (even it sticks around in dying state).
2605 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) {
2606 sx_xlock(&allprison_lock);
2607 flags |= PD_LIST_XLOCKED;
2609 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
2610 mtx_lock(&pr->pr_mtx);
2612 mtx_unlock(&pr->pr_mtx);
2615 /* If the prison still has references, nothing else to do. */
2617 if (flags & PD_LIST_SLOCKED)
2618 sx_sunlock(&allprison_lock);
2619 else if (flags & PD_LIST_XLOCKED)
2620 sx_xunlock(&allprison_lock);
2624 if (flags & PD_LIST_SLOCKED) {
2625 if (!sx_try_upgrade(&allprison_lock)) {
2626 sx_sunlock(&allprison_lock);
2627 sx_xlock(&allprison_lock);
2629 } else if (!(flags & PD_LIST_XLOCKED))
2630 sx_xlock(&allprison_lock);
2632 TAILQ_REMOVE(&allprison, pr, pr_list);
2633 LIST_REMOVE(pr, pr_sibling);
2634 ppr = pr->pr_parent;
2635 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
2636 tpr->pr_childcount--;
2637 sx_xunlock(&allprison_lock);
2640 if (pr->pr_vnet != ppr->pr_vnet)
2641 vnet_destroy(pr->pr_vnet);
2643 if (pr->pr_root != NULL)
2645 mtx_destroy(&pr->pr_mtx);
2647 free(pr->pr_ip4, M_PRISON);
2650 free(pr->pr_ip6, M_PRISON);
2652 if (pr->pr_cpuset != NULL)
2653 cpuset_rel(pr->pr_cpuset);
2657 prison_racct_detach(pr);
2661 /* Removing a prison frees a reference on its parent. */
2663 mtx_lock(&pr->pr_mtx);
2664 flags = PD_DEREF | PD_DEUREF;
2669 prison_hold_locked(struct prison *pr)
2672 mtx_assert(&pr->pr_mtx, MA_OWNED);
2673 KASSERT(pr->pr_ref > 0,
2674 ("Trying to hold dead prison (jid=%d).", pr->pr_id));
2679 prison_hold(struct prison *pr)
2682 mtx_lock(&pr->pr_mtx);
2683 prison_hold_locked(pr);
2684 mtx_unlock(&pr->pr_mtx);
2688 prison_proc_hold(struct prison *pr)
2691 mtx_lock(&pr->pr_mtx);
2692 KASSERT(pr->pr_uref > 0,
2693 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
2695 mtx_unlock(&pr->pr_mtx);
2699 prison_proc_free(struct prison *pr)
2702 mtx_lock(&pr->pr_mtx);
2703 KASSERT(pr->pr_uref > 0,
2704 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
2705 if (pr->pr_uref > 1)
2709 * Don't remove the last user reference in this context, which
2710 * is expected to be a process that is not only locked, but
2714 mtx_unlock(&pr->pr_mtx);
2715 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2718 mtx_unlock(&pr->pr_mtx);
2722 * Check if a jail supports the given address family.
2724 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
2728 prison_check_af(struct ucred *cred, int af)
2733 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2735 pr = cred->cr_prison;
2737 /* Prisons with their own network stack are not limited. */
2738 if (prison_owns_vnet(cred))
2747 if (pr->pr_flags & PR_IP4)
2749 mtx_lock(&pr->pr_mtx);
2750 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
2751 error = EAFNOSUPPORT;
2752 mtx_unlock(&pr->pr_mtx);
2758 if (pr->pr_flags & PR_IP6)
2760 mtx_lock(&pr->pr_mtx);
2761 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
2762 error = EAFNOSUPPORT;
2763 mtx_unlock(&pr->pr_mtx);
2771 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
2772 error = EAFNOSUPPORT;
2778 * Check if given address belongs to the jail referenced by cred (wrapper to
2779 * prison_check_ip[46]).
2781 * Returns 0 if jail doesn't restrict the address family or if address belongs
2782 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
2783 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
2786 prison_if(struct ucred *cred, struct sockaddr *sa)
2789 struct sockaddr_in *sai;
2792 struct sockaddr_in6 *sai6;
2796 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2797 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
2800 if (prison_owns_vnet(cred))
2805 switch (sa->sa_family)
2809 sai = (struct sockaddr_in *)sa;
2810 error = prison_check_ip4(cred, &sai->sin_addr);
2815 sai6 = (struct sockaddr_in6 *)sa;
2816 error = prison_check_ip6(cred, &sai6->sin6_addr);
2820 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
2821 error = EAFNOSUPPORT;
2827 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
2830 prison_check(struct ucred *cred1, struct ucred *cred2)
2833 return ((cred1->cr_prison == cred2->cr_prison ||
2834 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
2838 * Return 1 if p2 is a child of p1, otherwise 0.
2841 prison_ischild(struct prison *pr1, struct prison *pr2)
2844 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
2851 * Return 1 if the passed credential is in a jail, otherwise 0.
2854 jailed(struct ucred *cred)
2857 return (cred->cr_prison != &prison0);
2861 * Return 1 if the passed credential is in a jail and that jail does not
2862 * have its own virtual network stack, otherwise 0.
2865 jailed_without_vnet(struct ucred *cred)
2871 if (prison_owns_vnet(cred))
2879 * Return the correct hostname (domainname, et al) for the passed credential.
2882 getcredhostname(struct ucred *cred, char *buf, size_t size)
2887 * A NULL credential can be used to shortcut to the physical
2888 * system's hostname.
2890 pr = (cred != NULL) ? cred->cr_prison : &prison0;
2891 mtx_lock(&pr->pr_mtx);
2892 strlcpy(buf, pr->pr_hostname, size);
2893 mtx_unlock(&pr->pr_mtx);
2897 getcreddomainname(struct ucred *cred, char *buf, size_t size)
2900 mtx_lock(&cred->cr_prison->pr_mtx);
2901 strlcpy(buf, cred->cr_prison->pr_domainname, size);
2902 mtx_unlock(&cred->cr_prison->pr_mtx);
2906 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
2909 mtx_lock(&cred->cr_prison->pr_mtx);
2910 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
2911 mtx_unlock(&cred->cr_prison->pr_mtx);
2915 getcredhostid(struct ucred *cred, unsigned long *hostid)
2918 mtx_lock(&cred->cr_prison->pr_mtx);
2919 *hostid = cred->cr_prison->pr_hostid;
2920 mtx_unlock(&cred->cr_prison->pr_mtx);
2925 * Determine whether the prison represented by cred owns
2926 * its vnet rather than having it inherited.
2928 * Returns 1 in case the prison owns the vnet, 0 otherwise.
2931 prison_owns_vnet(struct ucred *cred)
2935 * vnets cannot be added/removed after jail creation,
2936 * so no need to lock here.
2938 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
2943 * Determine whether the subject represented by cred can "see"
2944 * status of a mount point.
2945 * Returns: 0 for permitted, ENOENT otherwise.
2946 * XXX: This function should be called cr_canseemount() and should be
2947 * placed in kern_prot.c.
2950 prison_canseemount(struct ucred *cred, struct mount *mp)
2956 pr = cred->cr_prison;
2957 if (pr->pr_enforce_statfs == 0)
2959 if (pr->pr_root->v_mount == mp)
2961 if (pr->pr_enforce_statfs == 2)
2964 * If jail's chroot directory is set to "/" we should be able to see
2965 * all mount-points from inside a jail.
2966 * This is ugly check, but this is the only situation when jail's
2967 * directory ends with '/'.
2969 if (strcmp(pr->pr_path, "/") == 0)
2971 len = strlen(pr->pr_path);
2973 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
2976 * Be sure that we don't have situation where jail's root directory
2977 * is "/some/path" and mount point is "/some/pathpath".
2979 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
2985 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
2987 char jpath[MAXPATHLEN];
2991 pr = cred->cr_prison;
2992 if (pr->pr_enforce_statfs == 0)
2994 if (prison_canseemount(cred, mp) != 0) {
2995 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
2996 strlcpy(sp->f_mntonname, "[restricted]",
2997 sizeof(sp->f_mntonname));
3000 if (pr->pr_root->v_mount == mp) {
3002 * Clear current buffer data, so we are sure nothing from
3003 * the valid path left there.
3005 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3006 *sp->f_mntonname = '/';
3010 * If jail's chroot directory is set to "/" we should be able to see
3011 * all mount-points from inside a jail.
3013 if (strcmp(pr->pr_path, "/") == 0)
3015 len = strlen(pr->pr_path);
3016 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
3018 * Clear current buffer data, so we are sure nothing from
3019 * the valid path left there.
3021 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3022 if (*jpath == '\0') {
3023 /* Should never happen. */
3024 *sp->f_mntonname = '/';
3026 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
3031 * Check with permission for a specific privilege is granted within jail. We
3032 * have a specific list of accepted privileges; the rest are denied.
3035 prison_priv_check(struct ucred *cred, int priv)
3043 * Privileges specific to prisons with a virtual network stack.
3044 * There might be a duplicate entry here in case the privilege
3045 * is only granted conditionally in the legacy jail case.
3050 * NFS-specific privileges.
3052 case PRIV_NFS_DAEMON:
3053 case PRIV_NFS_LOCKD:
3056 * Network stack privileges.
3058 case PRIV_NET_BRIDGE:
3061 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
3062 case PRIV_NET_ROUTE:
3064 case PRIV_NET_SETIFMTU:
3065 case PRIV_NET_SETIFFLAGS:
3066 case PRIV_NET_SETIFCAP:
3067 case PRIV_NET_SETIFDESCR:
3068 case PRIV_NET_SETIFNAME :
3069 case PRIV_NET_SETIFMETRIC:
3070 case PRIV_NET_SETIFPHYS:
3071 case PRIV_NET_SETIFMAC:
3072 case PRIV_NET_ADDMULTI:
3073 case PRIV_NET_DELMULTI:
3074 case PRIV_NET_HWIOCTL:
3075 case PRIV_NET_SETLLADDR:
3076 case PRIV_NET_ADDIFGROUP:
3077 case PRIV_NET_DELIFGROUP:
3078 case PRIV_NET_IFCREATE:
3079 case PRIV_NET_IFDESTROY:
3080 case PRIV_NET_ADDIFADDR:
3081 case PRIV_NET_DELIFADDR:
3084 case PRIV_NET_SETIFVNET:
3085 case PRIV_NET_SETIFFIB:
3088 * 802.11-related privileges.
3090 case PRIV_NET80211_GETKEY:
3092 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */
3099 case PRIV_NETATM_CFG:
3100 case PRIV_NETATM_ADD:
3101 case PRIV_NETATM_DEL:
3102 case PRIV_NETATM_SET:
3105 * Bluetooth privileges.
3107 case PRIV_NETBLUETOOTH_RAW:
3111 * Netgraph and netgraph module privileges.
3113 case PRIV_NETGRAPH_CONTROL:
3115 case PRIV_NETGRAPH_TTY:
3119 * IPv4 and IPv6 privileges.
3121 case PRIV_NETINET_IPFW:
3122 case PRIV_NETINET_DIVERT:
3123 case PRIV_NETINET_PF:
3124 case PRIV_NETINET_DUMMYNET:
3125 case PRIV_NETINET_CARP:
3126 case PRIV_NETINET_MROUTE:
3127 case PRIV_NETINET_RAW:
3128 case PRIV_NETINET_ADDRCTRL6:
3129 case PRIV_NETINET_ND6:
3130 case PRIV_NETINET_SCOPE6:
3131 case PRIV_NETINET_ALIFETIME6:
3132 case PRIV_NETINET_IPSEC:
3133 case PRIV_NETINET_BINDANY:
3148 * No default: or deny here.
3149 * In case of no permit fall through to next switch().
3151 if (cred->cr_prison->pr_flags & PR_VNET)
3159 * Allow ktrace privileges for root in jail.
3165 * Allow jailed processes to configure audit identity and
3166 * submit audit records (login, etc). In the future we may
3167 * want to further refine the relationship between audit and
3170 case PRIV_AUDIT_GETAUDIT:
3171 case PRIV_AUDIT_SETAUDIT:
3172 case PRIV_AUDIT_SUBMIT:
3176 * Allow jailed processes to manipulate process UNIX
3177 * credentials in any way they see fit.
3179 case PRIV_CRED_SETUID:
3180 case PRIV_CRED_SETEUID:
3181 case PRIV_CRED_SETGID:
3182 case PRIV_CRED_SETEGID:
3183 case PRIV_CRED_SETGROUPS:
3184 case PRIV_CRED_SETREUID:
3185 case PRIV_CRED_SETREGID:
3186 case PRIV_CRED_SETRESUID:
3187 case PRIV_CRED_SETRESGID:
3190 * Jail implements visibility constraints already, so allow
3191 * jailed root to override uid/gid-based constraints.
3193 case PRIV_SEEOTHERGIDS:
3194 case PRIV_SEEOTHERUIDS:
3197 * Jail implements inter-process debugging limits already, so
3198 * allow jailed root various debugging privileges.
3200 case PRIV_DEBUG_DIFFCRED:
3201 case PRIV_DEBUG_SUGID:
3202 case PRIV_DEBUG_UNPRIV:
3205 * Allow jail to set various resource limits and login
3206 * properties, and for now, exceed process resource limits.
3208 case PRIV_PROC_LIMIT:
3209 case PRIV_PROC_SETLOGIN:
3210 case PRIV_PROC_SETRLIMIT:
3213 * System V and POSIX IPC privileges are granted in jail.
3216 case PRIV_IPC_WRITE:
3217 case PRIV_IPC_ADMIN:
3218 case PRIV_IPC_MSGSIZE:
3222 * Jail operations within a jail work on child jails.
3224 case PRIV_JAIL_ATTACH:
3226 case PRIV_JAIL_REMOVE:
3229 * Jail implements its own inter-process limits, so allow
3230 * root processes in jail to change scheduling on other
3231 * processes in the same jail. Likewise for signalling.
3233 case PRIV_SCHED_DIFFCRED:
3234 case PRIV_SCHED_CPUSET:
3235 case PRIV_SIGNAL_DIFFCRED:
3236 case PRIV_SIGNAL_SUGID:
3239 * Allow jailed processes to write to sysctls marked as jail
3242 case PRIV_SYSCTL_WRITEJAIL:
3245 * Allow root in jail to manage a variety of quota
3246 * properties. These should likely be conditional on a
3247 * configuration option.
3249 case PRIV_VFS_GETQUOTA:
3250 case PRIV_VFS_SETQUOTA:
3253 * Since Jail relies on chroot() to implement file system
3254 * protections, grant many VFS privileges to root in jail.
3255 * Be careful to exclude mount-related and NFS-related
3259 case PRIV_VFS_WRITE:
3260 case PRIV_VFS_ADMIN:
3262 case PRIV_VFS_LOOKUP:
3263 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
3264 case PRIV_VFS_CHFLAGS_DEV:
3265 case PRIV_VFS_CHOWN:
3266 case PRIV_VFS_CHROOT:
3267 case PRIV_VFS_RETAINSUGID:
3268 case PRIV_VFS_FCHROOT:
3270 case PRIV_VFS_SETGID:
3272 case PRIV_VFS_STICKYFILE:
3275 * As in the non-jail case, non-root users are expected to be
3276 * able to read kernel/phyiscal memory (provided /dev/[k]mem
3277 * exists in the jail and they have permission to access it).
3279 case PRIV_KMEM_READ:
3283 * Depending on the global setting, allow privilege of
3284 * setting system flags.
3286 case PRIV_VFS_SYSFLAGS:
3287 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
3293 * Depending on the global setting, allow privilege of
3294 * mounting/unmounting file systems.
3296 case PRIV_VFS_MOUNT:
3297 case PRIV_VFS_UNMOUNT:
3298 case PRIV_VFS_MOUNT_NONUSER:
3299 case PRIV_VFS_MOUNT_OWNER:
3300 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT &&
3301 cred->cr_prison->pr_enforce_statfs < 2)
3307 * Allow jailed root to bind reserved ports and reuse in-use
3310 case PRIV_NETINET_RESERVEDPORT:
3311 case PRIV_NETINET_REUSEPORT:
3315 * Allow jailed root to set certain IPv4/6 (option) headers.
3317 case PRIV_NETINET_SETHDROPTS:
3321 * Conditionally allow creating raw sockets in jail.
3323 case PRIV_NETINET_RAW:
3324 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
3330 * Since jail implements its own visibility limits on netstat
3331 * sysctls, allow getcred. This allows identd to work in
3334 case PRIV_NETINET_GETCRED:
3338 * Allow jailed root to set loginclass.
3340 case PRIV_PROC_SETLOGINCLASS:
3345 * In all remaining cases, deny the privilege request. This
3346 * includes almost all network privileges, many system
3347 * configuration privileges.
3354 * Return the part of pr2's name that is relative to pr1, or the whole name
3355 * if it does not directly follow.
3359 prison_name(struct prison *pr1, struct prison *pr2)
3363 /* Jails see themselves as "0" (if they see themselves at all). */
3366 name = pr2->pr_name;
3367 if (prison_ischild(pr1, pr2)) {
3369 * pr1 isn't locked (and allprison_lock may not be either)
3370 * so its length can't be counted on. But the number of dots
3371 * can be counted on - and counted.
3373 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
3374 name = strchr(name, '.') + 1;
3380 * Return the part of pr2's path that is relative to pr1, or the whole path
3381 * if it does not directly follow.
3384 prison_path(struct prison *pr1, struct prison *pr2)
3386 char *path1, *path2;
3389 path1 = pr1->pr_path;
3390 path2 = pr2->pr_path;
3391 if (!strcmp(path1, "/"))
3393 len1 = strlen(path1);
3394 if (strncmp(path1, path2, len1))
3396 if (path2[len1] == '\0')
3398 if (path2[len1] == '/')
3399 return (path2 + len1);
3405 * Jail-related sysctls.
3407 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
3411 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
3414 struct prison *pr, *cpr;
3416 struct in_addr *ip4 = NULL;
3420 struct in6_addr *ip6 = NULL;
3425 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
3426 pr = req->td->td_ucred->cr_prison;
3428 sx_slock(&allprison_lock);
3429 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
3430 #if defined(INET) || defined(INET6)
3433 mtx_lock(&cpr->pr_mtx);
3435 if (cpr->pr_ip4s > 0) {
3436 if (ip4s < cpr->pr_ip4s) {
3437 ip4s = cpr->pr_ip4s;
3438 mtx_unlock(&cpr->pr_mtx);
3439 ip4 = realloc(ip4, ip4s *
3440 sizeof(struct in_addr), M_TEMP, M_WAITOK);
3443 bcopy(cpr->pr_ip4, ip4,
3444 cpr->pr_ip4s * sizeof(struct in_addr));
3448 if (cpr->pr_ip6s > 0) {
3449 if (ip6s < cpr->pr_ip6s) {
3450 ip6s = cpr->pr_ip6s;
3451 mtx_unlock(&cpr->pr_mtx);
3452 ip6 = realloc(ip6, ip6s *
3453 sizeof(struct in6_addr), M_TEMP, M_WAITOK);
3456 bcopy(cpr->pr_ip6, ip6,
3457 cpr->pr_ip6s * sizeof(struct in6_addr));
3460 if (cpr->pr_ref == 0) {
3461 mtx_unlock(&cpr->pr_mtx);
3464 bzero(xp, sizeof(*xp));
3465 xp->pr_version = XPRISON_VERSION;
3466 xp->pr_id = cpr->pr_id;
3467 xp->pr_state = cpr->pr_uref > 0
3468 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
3469 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
3470 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
3471 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
3473 xp->pr_ip4s = cpr->pr_ip4s;
3476 xp->pr_ip6s = cpr->pr_ip6s;
3478 mtx_unlock(&cpr->pr_mtx);
3479 error = SYSCTL_OUT(req, xp, sizeof(*xp));
3483 if (xp->pr_ip4s > 0) {
3484 error = SYSCTL_OUT(req, ip4,
3485 xp->pr_ip4s * sizeof(struct in_addr));
3491 if (xp->pr_ip6s > 0) {
3492 error = SYSCTL_OUT(req, ip6,
3493 xp->pr_ip6s * sizeof(struct in6_addr));
3499 sx_sunlock(&allprison_lock);
3510 SYSCTL_OID(_security_jail, OID_AUTO, list,
3511 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
3512 sysctl_jail_list, "S", "List of active jails");
3515 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
3519 injail = jailed(req->td->td_ucred);
3520 error = SYSCTL_OUT(req, &injail, sizeof(injail));
3525 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
3526 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
3527 sysctl_jail_jailed, "I", "Process in jail?");
3530 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
3532 int error, havevnet;
3534 struct ucred *cred = req->td->td_ucred;
3536 havevnet = jailed(cred) && prison_owns_vnet(cred);
3540 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
3545 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
3546 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
3547 sysctl_jail_vnet, "I", "Jail owns VNET?");
3549 #if defined(INET) || defined(INET6)
3550 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
3551 &jail_max_af_ips, 0,
3552 "Number of IP addresses a jail may have at most per address family (deprecated)");
3556 * Default parameters for jail(2) compatibility. For historical reasons,
3557 * the sysctl names have varying similarity to the parameter names. Prisons
3558 * just see their own parameters, and can't change them.
3561 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
3564 int allow, error, i;
3566 pr = req->td->td_ucred->cr_prison;
3567 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
3569 /* Get the current flag value, and convert it to a boolean. */
3570 i = (allow & arg2) ? 1 : 0;
3573 error = sysctl_handle_int(oidp, &i, 0, req);
3574 if (error || !req->newptr)
3580 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
3583 mtx_lock(&prison0.pr_mtx);
3584 jail_default_allow = (jail_default_allow & ~arg2) | i;
3585 mtx_unlock(&prison0.pr_mtx);
3589 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
3590 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3591 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
3592 "Processes in jail can set their hostnames (deprecated)");
3593 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
3594 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3595 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
3596 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)");
3597 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
3598 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3599 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
3600 "Processes in jail can use System V IPC primitives (deprecated)");
3601 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
3602 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3603 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
3604 "Prison root can create raw sockets (deprecated)");
3605 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
3606 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3607 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
3608 "Processes in jail can alter system file flags (deprecated)");
3609 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
3610 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3611 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
3612 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)");
3613 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed,
3614 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3615 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I",
3616 "Processes in jail can mount the devfs file system (deprecated)");
3617 SYSCTL_PROC(_security_jail, OID_AUTO, mount_fdescfs_allowed,
3618 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3619 NULL, PR_ALLOW_MOUNT_FDESCFS, sysctl_jail_default_allow, "I",
3620 "Processes in jail can mount the fdescfs file system (deprecated)");
3621 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed,
3622 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3623 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I",
3624 "Processes in jail can mount the nullfs file system (deprecated)");
3625 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed,
3626 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3627 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I",
3628 "Processes in jail can mount the procfs file system (deprecated)");
3629 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linprocfs_allowed,
3630 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3631 NULL, PR_ALLOW_MOUNT_LINPROCFS, sysctl_jail_default_allow, "I",
3632 "Processes in jail can mount the linprocfs file system (deprecated)");
3633 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linsysfs_allowed,
3634 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3635 NULL, PR_ALLOW_MOUNT_LINSYSFS, sysctl_jail_default_allow, "I",
3636 "Processes in jail can mount the linsysfs file system (deprecated)");
3637 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed,
3638 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3639 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I",
3640 "Processes in jail can mount the tmpfs file system (deprecated)");
3641 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed,
3642 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3643 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I",
3644 "Processes in jail can mount the zfs file system (deprecated)");
3647 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
3652 pr = req->td->td_ucred->cr_prison;
3653 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
3654 error = sysctl_handle_int(oidp, &level, 0, req);
3655 if (error || !req->newptr)
3657 *(int *)arg1 = level;
3661 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
3662 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3663 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
3664 sysctl_jail_default_level, "I",
3665 "Processes in jail cannot see all mounted file systems (deprecated)");
3667 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
3668 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
3669 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
3670 sysctl_jail_default_level, "I",
3671 "Ruleset for the devfs filesystem in jail (deprecated)");
3674 * Nodes to describe jail parameters. Maximum length of string parameters
3675 * is returned in the string itself, and the other parameters exist merely
3676 * to make themselves and their types known.
3678 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0,
3682 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
3689 switch (oidp->oid_kind & CTLTYPE)
3695 if (!(req->flags & SCTL_MASK32))
3697 return (SYSCTL_OUT(req, &l, sizeof(l)));
3701 return (SYSCTL_OUT(req, &i, sizeof(i)));
3702 case CTLTYPE_STRING:
3703 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
3705 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
3706 case CTLTYPE_STRUCT:
3708 return (SYSCTL_OUT(req, &s, sizeof(s)));
3714 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at
3715 * jail creation time but cannot be changed in an existing jail.
3717 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
3718 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
3719 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
3720 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
3721 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
3722 "I", "Jail secure level");
3723 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I",
3724 "Jail value for kern.osreldate and uname -K");
3725 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN,
3726 "Jail value for kern.osrelease and uname -r");
3727 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
3728 "I", "Jail cannot see all mounted file systems");
3729 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
3730 "I", "Ruleset for in-jail devfs mounts");
3731 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
3732 "B", "Jail persistence");
3734 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
3735 "E,jailsys", "Virtual network stack");
3737 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
3738 "B", "Jail is in the process of shutting down");
3740 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
3741 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
3742 "I", "Current number of child jails");
3743 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
3744 "I", "Maximum number of child jails");
3746 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
3747 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
3749 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
3750 "Jail NIS domainname");
3751 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
3753 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
3754 "LU", "Jail host ID");
3756 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
3757 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
3760 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
3761 "Jail IPv4 address virtualization");
3762 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
3763 "S,in_addr,a", "Jail IPv4 addresses");
3764 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
3765 "B", "Do (not) use IPv4 source address selection rather than the "
3766 "primary jail IPv4 address.");
3769 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
3770 "Jail IPv6 address virtualization");
3771 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
3772 "S,in6_addr,a", "Jail IPv6 addresses");
3773 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
3774 "B", "Do (not) use IPv6 source address selection rather than the "
3775 "primary jail IPv6 address.");
3778 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
3779 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
3780 "B", "Jail may set hostname");
3781 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
3782 "B", "Jail may use SYSV IPC");
3783 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
3784 "B", "Jail may create raw sockets");
3785 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
3786 "B", "Jail may alter system file flags");
3787 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
3788 "B", "Jail may set file quotas");
3789 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
3790 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
3792 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
3793 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
3794 "B", "Jail may mount/unmount jail-friendly file systems in general");
3795 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW,
3796 "B", "Jail may mount the devfs file system");
3797 SYSCTL_JAIL_PARAM(_allow_mount, fdescfs, CTLTYPE_INT | CTLFLAG_RW,
3798 "B", "Jail may mount the fdescfs file system");
3799 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW,
3800 "B", "Jail may mount the nullfs file system");
3801 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW,
3802 "B", "Jail may mount the procfs file system");
3803 SYSCTL_JAIL_PARAM(_allow_mount, linprocfs, CTLTYPE_INT | CTLFLAG_RW,
3804 "B", "Jail may mount the linprocfs file system");
3805 SYSCTL_JAIL_PARAM(_allow_mount, linsysfs, CTLTYPE_INT | CTLFLAG_RW,
3806 "B", "Jail may mount the linsysfs file system");
3807 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW,
3808 "B", "Jail may mount the tmpfs file system");
3809 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW,
3810 "B", "Jail may mount the zfs file system");
3814 prison_racct_foreach(void (*callback)(struct racct *racct,
3815 void *arg2, void *arg3), void (*pre)(void), void (*post)(void),
3816 void *arg2, void *arg3)
3818 struct prison_racct *prr;
3820 ASSERT_RACCT_ENABLED();
3822 sx_slock(&allprison_lock);
3825 LIST_FOREACH(prr, &allprison_racct, prr_next)
3826 (callback)(prr->prr_racct, arg2, arg3);
3829 sx_sunlock(&allprison_lock);
3832 static struct prison_racct *
3833 prison_racct_find_locked(const char *name)
3835 struct prison_racct *prr;
3837 ASSERT_RACCT_ENABLED();
3838 sx_assert(&allprison_lock, SA_XLOCKED);
3840 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
3843 LIST_FOREACH(prr, &allprison_racct, prr_next) {
3844 if (strcmp(name, prr->prr_name) != 0)
3847 /* Found prison_racct with a matching name? */
3848 prison_racct_hold(prr);
3852 /* Add new prison_racct. */
3853 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
3854 racct_create(&prr->prr_racct);
3856 strcpy(prr->prr_name, name);
3857 refcount_init(&prr->prr_refcount, 1);
3858 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
3863 struct prison_racct *
3864 prison_racct_find(const char *name)
3866 struct prison_racct *prr;
3868 ASSERT_RACCT_ENABLED();
3870 sx_xlock(&allprison_lock);
3871 prr = prison_racct_find_locked(name);
3872 sx_xunlock(&allprison_lock);
3877 prison_racct_hold(struct prison_racct *prr)
3880 ASSERT_RACCT_ENABLED();
3882 refcount_acquire(&prr->prr_refcount);
3886 prison_racct_free_locked(struct prison_racct *prr)
3889 ASSERT_RACCT_ENABLED();
3890 sx_assert(&allprison_lock, SA_XLOCKED);
3892 if (refcount_release(&prr->prr_refcount)) {
3893 racct_destroy(&prr->prr_racct);
3894 LIST_REMOVE(prr, prr_next);
3895 free(prr, M_PRISON_RACCT);
3900 prison_racct_free(struct prison_racct *prr)
3904 ASSERT_RACCT_ENABLED();
3905 sx_assert(&allprison_lock, SA_UNLOCKED);
3907 old = prr->prr_refcount;
3908 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1))
3911 sx_xlock(&allprison_lock);
3912 prison_racct_free_locked(prr);
3913 sx_xunlock(&allprison_lock);
3917 prison_racct_attach(struct prison *pr)
3919 struct prison_racct *prr;
3921 ASSERT_RACCT_ENABLED();
3922 sx_assert(&allprison_lock, SA_XLOCKED);
3924 prr = prison_racct_find_locked(pr->pr_name);
3925 KASSERT(prr != NULL, ("cannot find prison_racct"));
3927 pr->pr_prison_racct = prr;
3931 * Handle jail renaming. From the racct point of view, renaming means
3932 * moving from one prison_racct to another.
3935 prison_racct_modify(struct prison *pr)
3939 struct prison_racct *oldprr;
3941 ASSERT_RACCT_ENABLED();
3943 sx_slock(&allproc_lock);
3944 sx_xlock(&allprison_lock);
3946 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
3947 sx_xunlock(&allprison_lock);
3948 sx_sunlock(&allproc_lock);
3952 oldprr = pr->pr_prison_racct;
3953 pr->pr_prison_racct = NULL;
3955 prison_racct_attach(pr);
3958 * Move resource utilisation records.
3960 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
3963 * Force rctl to reattach rules to processes.
3965 FOREACH_PROC_IN_SYSTEM(p) {
3967 cred = crhold(p->p_ucred);
3969 racct_proc_ucred_changed(p, cred, cred);
3973 sx_sunlock(&allproc_lock);
3974 prison_racct_free_locked(oldprr);
3975 sx_xunlock(&allprison_lock);
3979 prison_racct_detach(struct prison *pr)
3982 ASSERT_RACCT_ENABLED();
3983 sx_assert(&allprison_lock, SA_UNLOCKED);
3985 if (pr->pr_prison_racct == NULL)
3987 prison_racct_free(pr->pr_prison_racct);
3988 pr->pr_prison_racct = NULL;
3995 db_show_prison(struct prison *pr)
3998 #if defined(INET) || defined(INET6)
4003 char ip4buf[INET_ADDRSTRLEN];
4006 char ip6buf[INET6_ADDRSTRLEN];
4009 db_printf("prison %p:\n", pr);
4010 db_printf(" jid = %d\n", pr->pr_id);
4011 db_printf(" name = %s\n", pr->pr_name);
4012 db_printf(" parent = %p\n", pr->pr_parent);
4013 db_printf(" ref = %d\n", pr->pr_ref);
4014 db_printf(" uref = %d\n", pr->pr_uref);
4015 db_printf(" path = %s\n", pr->pr_path);
4016 db_printf(" cpuset = %d\n", pr->pr_cpuset
4017 ? pr->pr_cpuset->cs_id : -1);
4019 db_printf(" vnet = %p\n", pr->pr_vnet);
4021 db_printf(" root = %p\n", pr->pr_root);
4022 db_printf(" securelevel = %d\n", pr->pr_securelevel);
4023 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
4024 db_printf(" children.max = %d\n", pr->pr_childmax);
4025 db_printf(" children.cur = %d\n", pr->pr_childcount);
4026 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
4027 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
4028 db_printf(" flags = 0x%x", pr->pr_flags);
4029 for (fi = 0; fi < nitems(pr_flag_names); fi++)
4030 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi)))
4031 db_printf(" %s", pr_flag_names[fi]);
4032 for (fi = 0; fi < nitems(pr_flag_jailsys); fi++) {
4033 jsf = pr->pr_flags &
4034 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
4035 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name,
4036 pr_flag_jailsys[fi].disable &&
4037 (jsf == pr_flag_jailsys[fi].disable) ? "disable"
4038 : (jsf == pr_flag_jailsys[fi].new) ? "new"
4041 db_printf(" allow = 0x%x", pr->pr_allow);
4042 for (fi = 0; fi < nitems(pr_allow_names); fi++)
4043 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi)))
4044 db_printf(" %s", pr_allow_names[fi]);
4046 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
4047 db_printf(" host.hostname = %s\n", pr->pr_hostname);
4048 db_printf(" host.domainname = %s\n", pr->pr_domainname);
4049 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
4050 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
4052 db_printf(" ip4s = %d\n", pr->pr_ip4s);
4053 for (ii = 0; ii < pr->pr_ip4s; ii++)
4054 db_printf(" %s %s\n",
4055 ii == 0 ? "ip4.addr =" : " ",
4056 inet_ntoa_r(pr->pr_ip4[ii], ip4buf));
4059 db_printf(" ip6s = %d\n", pr->pr_ip6s);
4060 for (ii = 0; ii < pr->pr_ip6s; ii++)
4061 db_printf(" %s %s\n",
4062 ii == 0 ? "ip6.addr =" : " ",
4063 ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
4067 DB_SHOW_COMMAND(prison, db_show_prison_command)
4073 * Show all prisons in the list, and prison0 which is not
4076 db_show_prison(&prison0);
4077 if (!db_pager_quit) {
4078 TAILQ_FOREACH(pr, &allprison, pr_list) {
4090 /* Look for a prison with the ID and with references. */
4091 TAILQ_FOREACH(pr, &allprison, pr_list)
4092 if (pr->pr_id == addr && pr->pr_ref > 0)
4095 /* Look again, without requiring a reference. */
4096 TAILQ_FOREACH(pr, &allprison, pr_list)
4097 if (pr->pr_id == addr)
4100 /* Assume address points to a valid prison. */
4101 pr = (struct prison *)addr;