2 * ----------------------------------------------------------------------------
3 * "THE BEER-WARE LICENSE" (Revision 42):
4 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
5 * can do whatever you want with this stuff. If we meet some day, and you think
6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
7 * ----------------------------------------------------------------------------
11 * Copyright (c) 2006 Victor Balada Diaz <victor@bsdes.net>
12 * All rights reserved.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * $FreeBSD: src/sys/kern/kern_jail.c,v 1.6.2.3 2001/08/17 01:00:26 rwatson Exp $
39 * $DragonFly: src/sys/kern/kern_jail.c,v 1.15 2006/12/31 19:36:54 dillon Exp $
43 #include <sys/param.h>
44 #include <sys/types.h>
45 #include <sys/kernel.h>
46 #include <sys/systm.h>
47 #include <sys/errno.h>
48 #include <sys/sysproto.h>
49 #include <sys/malloc.h>
50 #include <sys/nlookup.h>
51 #include <sys/namecache.h>
54 #include <sys/socket.h>
55 #include <sys/sysctl.h>
56 #include <sys/kern_syscall.h>
58 #include <netinet/in.h>
59 #include <netinet6/in6_var.h>
61 static struct prison *prison_find(int);
63 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
65 SYSCTL_NODE(, OID_AUTO, jail, CTLFLAG_RW, 0,
68 int jail_set_hostname_allowed = 1;
69 SYSCTL_INT(_jail, OID_AUTO, set_hostname_allowed, CTLFLAG_RW,
70 &jail_set_hostname_allowed, 0,
71 "Processes in jail can set their hostnames");
73 int jail_socket_unixiproute_only = 1;
74 SYSCTL_INT(_jail, OID_AUTO, socket_unixiproute_only, CTLFLAG_RW,
75 &jail_socket_unixiproute_only, 0,
76 "Processes in jail are limited to creating UNIX/IPv[46]/route sockets only");
78 int jail_sysvipc_allowed = 0;
79 SYSCTL_INT(_jail, OID_AUTO, sysvipc_allowed, CTLFLAG_RW,
80 &jail_sysvipc_allowed, 0,
81 "Processes in jail can use System V IPC primitives");
83 int jail_chflags_allowed = 0;
84 SYSCTL_INT(_jail, OID_AUTO, chflags_allowed, CTLFLAG_RW,
85 &jail_chflags_allowed, 0,
86 "Process in jail can set chflags(1)");
91 LIST_HEAD(prisonlist, prison);
92 struct prisonlist allprison = LIST_HEAD_INITIALIZER(&allprison);
95 kern_jail_attach(int jid)
97 struct proc *p = curthread->td_proc;
101 pr = prison_find(jid);
105 error = kern_chroot(&pr->pr_root);
111 p->p_ucred->cr_prison = pr;
112 p->p_flag |= P_JAILED;
120 * jail_args(syscallarg(struct jail *) jail)
123 sys_jail(struct jail_args *uap)
125 struct prison *pr, *tpr;
128 struct thread *td = curthread;
129 int error, tryprid, i;
131 struct nlookupdata nd;
133 struct sockaddr_storage *uips; /* Userland ips */
134 struct sockaddr_in ip4addr;
135 struct jail_ip_storage *jip;
141 error = copyin(uap->jail, &jversion, sizeof jversion);
144 pr = kmalloc(sizeof *pr , M_PRISON, M_WAITOK | M_ZERO);
145 SLIST_INIT(&pr->pr_ips);
149 error = copyin(uap->jail, &jv0, sizeof(struct jail_v0));
152 jip = kmalloc(sizeof(*jip), M_PRISON, M_WAITOK | M_ZERO);
153 ip4addr.sin_family = AF_INET;
154 ip4addr.sin_addr.s_addr = htonl(jv0.ip_number);
155 memcpy(&jip->ip, &ip4addr, sizeof(ip4addr));
156 SLIST_INSERT_HEAD(&pr->pr_ips, jip, entries);
159 error = copyin(uap->jail, &j, sizeof(j));
162 uips = kmalloc((sizeof(*uips) * j.n_ips), M_PRISON,
164 error = copyin(j.ips, uips, (sizeof(*uips) * j.n_ips));
166 kfree(uips, M_PRISON);
169 for (i = 0; i < j.n_ips; i++) {
170 jip = kmalloc(sizeof(*jip), M_PRISON,
172 memcpy(&jip->ip, &uips[i], sizeof(*uips));
173 SLIST_INSERT_HEAD(&pr->pr_ips, jip, entries);
175 kfree(uips, M_PRISON);
182 error = copyinstr(j.hostname, &pr->pr_host, sizeof pr->pr_host, 0);
185 error = nlookup_init(&nd, j.path, UIO_USERSPACE, NLC_FOLLOW);
187 goto nlookup_init_clean;
188 error = nlookup(&nd);
190 goto nlookup_init_clean;
191 cache_copy(&nd.nl_nch, &pr->pr_root);
193 varsymset_init(&pr->pr_varsymset, NULL);
195 tryprid = lastprid + 1;
196 if (tryprid == JAIL_MAX)
199 LIST_FOREACH(tpr, &allprison, pr_list) {
200 if (tpr->pr_id != tryprid)
203 if (tryprid == JAIL_MAX) {
209 pr->pr_id = lastprid = tryprid;
210 LIST_INSERT_HEAD(&allprison, pr, pr_list);
213 error = kern_jail_attach(pr->pr_id);
215 goto jail_attach_clean;
221 LIST_REMOVE(pr, pr_list);
223 varsymset_clean(&pr->pr_varsymset);
228 while (!SLIST_EMPTY(&pr->pr_ips)) {
229 jip = SLIST_FIRST(&pr->pr_ips);
230 SLIST_REMOVE_HEAD(&pr->pr_ips, entries);
238 * int jail_attach(int jid);
241 sys_jail_attach(struct jail_attach_args *uap)
243 struct thread *td = curthread;
250 return(kern_jail_attach(uap->jid));
254 * Changes INADDR_LOOPBACK for a valid jail address.
255 * ip is in network byte order.
256 * Returns 1 if the ip is among jail valid ips.
257 * Returns 0 if is not among jail valid ips or
258 * if couldn't replace INADDR_LOOPBACK for a valid
262 prison_replace_wildcards(struct thread *td, struct sockaddr *ip)
264 struct sockaddr_in *ip4 = (struct sockaddr_in *)ip;
265 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)ip;
268 if (td->td_proc == NULL)
270 if ((pr = td->td_proc->p_ucred->cr_prison) == NULL)
273 if ((ip->sa_family == AF_INET &&
274 ip4->sin_addr.s_addr == htonl(INADDR_ANY)) ||
275 (ip->sa_family == AF_INET6 &&
276 IN6_IS_ADDR_UNSPECIFIED(&ip6->sin6_addr)))
278 if ((ip->sa_family == AF_INET &&
279 ip4->sin_addr.s_addr == htonl(INADDR_LOOPBACK)) ||
280 (ip->sa_family == AF_INET6 &&
281 IN6_IS_ADDR_LOOPBACK(&ip6->sin6_addr))) {
282 if (!prison_get_local(pr, ip) && !prison_get_nonlocal(pr, ip))
287 if (jailed_ip(pr, ip))
293 prison_remote_ip(struct thread *td, struct sockaddr *ip)
295 struct sockaddr_in *ip4 = (struct sockaddr_in *)ip;
296 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)ip;
299 if (td == NULL || td->td_proc == NULL)
301 if ((pr = td->td_proc->p_ucred->cr_prison) == NULL)
303 if ((ip->sa_family == AF_INET &&
304 ip4->sin_addr.s_addr == htonl(INADDR_LOOPBACK)) ||
305 (ip->sa_family == AF_INET6 &&
306 IN6_IS_ADDR_LOOPBACK(&ip6->sin6_addr))) {
307 if (!prison_get_local(pr, ip) && !prison_get_nonlocal(pr, ip))
316 * Prison get non loopback ip:
317 * Put on *ip the first IP address that is not a loopback address.
318 * af is the address family of the ip we want (AF_INET|AF_INET6).
319 * ip is in network by order and we don't touch it unless we find a valid ip.
320 * Return 1 if we've found a non loopback ip, else return 0.
323 prison_get_nonlocal(struct prison *pr, struct sockaddr *ip)
325 struct jail_ip_storage *jis;
326 struct sockaddr_in *jip4, *ip4;
327 struct sockaddr_in6 *jip6, *ip6;
329 ip4 = (struct sockaddr_in *)ip;
330 ip6 = (struct sockaddr_in6 *)ip;
331 /* Check if it is cached */
332 switch(ip->sa_family) {
334 /* -1 Means that we don't have any address */
335 if (pr->nonlocal_ip4 == (struct sockaddr_storage *)-1)
337 if (pr->nonlocal_ip4 != NULL) {
338 jip4 = (struct sockaddr_in *) pr->nonlocal_ip4;
339 ip4->sin_addr.s_addr = jip4->sin_addr.s_addr;
343 /* -1 Means that we don't have any address */
344 if (pr->nonlocal_ip6 == (struct sockaddr_storage *)-1)
346 if (pr->nonlocal_ip6 != NULL) {
347 jip6 = (struct sockaddr_in6 *) pr->nonlocal_ip6;
348 ip6->sin6_addr = jip6->sin6_addr;
352 SLIST_FOREACH(jis, &pr->pr_ips, entries) {
353 switch (ip->sa_family) {
355 jip4 = (struct sockaddr_in *) &jis->ip;
356 if (jip4->sin_family == AF_INET &&
357 ((ntohl(jip4->sin_addr.s_addr) >> IN_CLASSA_NSHIFT) != IN_LOOPBACKNET)) {
358 pr->nonlocal_ip4 = &jis->ip;
359 ip4->sin_addr.s_addr = jip4->sin_addr.s_addr;
364 jip6 = (struct sockaddr_in6 *) &jis->ip;
365 if ( jip6->sin6_family == AF_INET6 &&
366 !IN6_IS_ADDR_LOOPBACK(&jip6->sin6_addr)) {
367 pr->nonlocal_ip6 = &jis->ip;
368 ip6->sin6_addr = jip6->sin6_addr;
374 if (ip->sa_family == AF_INET)
375 pr->nonlocal_ip4 = (struct sockaddr_storage *)-1;
377 pr->nonlocal_ip6 = (struct sockaddr_storage *)-1;
382 * Prison get loopback ip.
383 * Put on *ip the first loopback IP address.
384 * af is the address family of the ip we want (AF_INET|PF_INET).
385 * *ip is in network by order and we don't touch it unless we find a valid ip.
386 * return 1 if we've found a loopback ip, else return 0.
389 prison_get_local(struct prison *pr, struct sockaddr *ip)
391 struct jail_ip_storage *jis;
392 struct sockaddr_in *jip4, *ip4;
393 struct sockaddr_in6 *jip6, *ip6;
395 ip4 = (struct sockaddr_in *)ip;
396 ip6 = (struct sockaddr_in6 *)ip;
397 /* Check if it is cached */
398 switch(ip->sa_family) {
400 /* -1 Means that we don't have any address */
401 if (pr->local_ip4 == (struct sockaddr_storage *)-1)
403 if (pr->local_ip4 != NULL) {
404 jip4 = (struct sockaddr_in *) pr->local_ip4;
405 ip4->sin_addr.s_addr = jip4->sin_addr.s_addr;
409 /* -1 Means that we don't have any address */
410 if (pr->local_ip6 == (struct sockaddr_storage *)-1)
412 if (pr->local_ip6 != NULL) {
413 jip6 = (struct sockaddr_in6 *) pr->local_ip6;
414 ip6->sin6_addr = jip6->sin6_addr;
418 SLIST_FOREACH(jis, &pr->pr_ips, entries) {
419 switch(ip->sa_family) {
421 jip4 = (struct sockaddr_in *) &jis->ip;
422 if (jip4->sin_family == AF_INET &&
423 ((ntohl(jip4->sin_addr.s_addr) >> IN_CLASSA_NSHIFT)
424 == IN_LOOPBACKNET)) {
425 pr->local_ip4 = &jis->ip;
426 ip4->sin_addr.s_addr = jip4->sin_addr.s_addr;
431 jip6 = (struct sockaddr_in6 *) &jis->ip;
432 if (jip6->sin6_family == AF_INET6 &&
433 IN6_IS_ADDR_LOOPBACK(&jip6->sin6_addr)) {
434 pr->local_ip6 = &jis->ip;
435 ip6->sin6_addr = jip6->sin6_addr;
441 if (ip->sa_family == AF_INET)
442 pr->local_ip4 = (struct sockaddr_storage *)-1;
444 pr->local_ip6 = (struct sockaddr_storage *)-1;
448 /* Check if the IP is among ours, if it is return 1, else 0 */
450 jailed_ip(struct prison *pr, struct sockaddr *ip)
452 struct jail_ip_storage *jis;
453 struct sockaddr_in *jip4, *ip4;
454 struct sockaddr_in6 *jip6, *ip6;
458 ip4 = (struct sockaddr_in *)ip;
459 ip6 = (struct sockaddr_in6 *)ip;
460 SLIST_FOREACH(jis, &pr->pr_ips, entries) {
461 switch (ip->sa_family) {
463 jip4 = (struct sockaddr_in *) &jis->ip;
464 if (jip4->sin_family == AF_INET &&
465 ip4->sin_addr.s_addr == jip4->sin_addr.s_addr)
469 jip6 = (struct sockaddr_in6 *) &jis->ip;
470 if (jip6->sin6_family == AF_INET6 &&
471 IN6_ARE_ADDR_EQUAL(&ip6->sin6_addr,
482 prison_if(struct ucred *cred, struct sockaddr *sa)
485 struct sockaddr_in *sai = (struct sockaddr_in*) sa;
487 pr = cred->cr_prison;
489 if (((sai->sin_family != AF_INET) && (sai->sin_family != AF_INET6))
490 && jail_socket_unixiproute_only)
492 else if ((sai->sin_family != AF_INET) && (sai->sin_family != AF_INET6))
494 else if (jailed_ip(pr, sa))
500 * Returns a prison instance, or NULL on failure.
502 static struct prison *
503 prison_find(int prid)
507 LIST_FOREACH(pr, &allprison, pr_list) {
508 if (pr->pr_id == prid)
515 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
517 struct jail_ip_storage *jip;
519 struct sockaddr_in6 *jsin6;
521 struct sockaddr_in *jsin;
524 unsigned int jlssize, jlsused;
526 char *jls; /* Jail list */
527 char *oip; /* Output ip */
528 char *fullpath, *freepath;
531 p = curthread->td_proc;
533 if (jailed(p->p_ucred))
541 jlssize = (count * 1024);
542 jls = kmalloc(jlssize + 1, M_TEMP, M_WAITOK | M_ZERO);
543 if (count < prisoncount) {
549 LIST_FOREACH(pr, &allprison, pr_list) {
550 error = cache_fullpath(p, &pr->pr_root, &fullpath, &freepath);
553 if (jlsused && jlsused < jlssize)
554 jls[jlsused++] = '\n';
555 count = ksnprintf(jls + jlsused, (jlssize - jlsused),
557 pr->pr_id, pr->pr_host, fullpath);
558 kfree(freepath, M_TEMP);
564 SLIST_FOREACH(jip, &pr->pr_ips, entries) {
565 jsin = (struct sockaddr_in *)&jip->ip;
567 switch(jsin->sin_family) {
569 oip = inet_ntoa(jsin->sin_addr);
573 jsin6 = (struct sockaddr_in6 *)&jip->ip;
574 oip = ip6_sprintf(&jsin6->sin6_addr);
582 if ((jlssize - jlsused) < (strlen(oip) + 1)) {
586 count = ksnprintf(jls + jlsused, (jlssize - jlsused),
596 * pr_id <SPC> hostname1 <SPC> PATH1 <SPC> IP1 <SPC> IP2\npr_id...
598 error = SYSCTL_OUT(req, jls, jlsused);
604 SYSCTL_OID(_jail, OID_AUTO, list, CTLTYPE_STRING | CTLFLAG_RD, NULL, 0,
605 sysctl_jail_list, "A", "List of active jails");
608 prison_hold(struct prison *pr)
614 prison_free(struct prison *pr)
616 struct jail_ip_storage *jls;
617 KKASSERT(pr->pr_ref >= 1);
619 if (--pr->pr_ref > 0)
623 while (!SLIST_EMPTY(&pr->pr_ips)) {
624 jls = SLIST_FIRST(&pr->pr_ips);
625 SLIST_REMOVE_HEAD(&pr->pr_ips, entries);
628 LIST_REMOVE(pr, pr_list);
631 if (pr->pr_linux != NULL)
632 kfree(pr->pr_linux, M_PRISON);
633 varsymset_clean(&pr->pr_varsymset);
634 cache_drop(&pr->pr_root);