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 1.18 2007/02/16 23:41:02 victor Exp $
42 #include "opt_inet6.h"
44 #include <sys/param.h>
45 #include <sys/types.h>
46 #include <sys/kernel.h>
47 #include <sys/systm.h>
48 #include <sys/errno.h>
49 #include <sys/sysproto.h>
50 #include <sys/malloc.h>
51 #include <sys/nlookup.h>
52 #include <sys/namecache.h>
55 #include <sys/socket.h>
56 #include <sys/sysctl.h>
57 #include <sys/kern_syscall.h>
59 #include <netinet/in.h>
60 #include <netinet6/in6_var.h>
62 static struct prison *prison_find(int);
63 static void prison_ipcache_init(struct prison *);
65 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
67 SYSCTL_NODE(, OID_AUTO, jail, CTLFLAG_RW, 0,
70 int jail_set_hostname_allowed = 1;
71 SYSCTL_INT(_jail, OID_AUTO, set_hostname_allowed, CTLFLAG_RW,
72 &jail_set_hostname_allowed, 0,
73 "Processes in jail can set their hostnames");
75 int jail_socket_unixiproute_only = 1;
76 SYSCTL_INT(_jail, OID_AUTO, socket_unixiproute_only, CTLFLAG_RW,
77 &jail_socket_unixiproute_only, 0,
78 "Processes in jail are limited to creating UNIX/IPv[46]/route sockets only");
80 int jail_sysvipc_allowed = 0;
81 SYSCTL_INT(_jail, OID_AUTO, sysvipc_allowed, CTLFLAG_RW,
82 &jail_sysvipc_allowed, 0,
83 "Processes in jail can use System V IPC primitives");
85 int jail_chflags_allowed = 0;
86 SYSCTL_INT(_jail, OID_AUTO, chflags_allowed, CTLFLAG_RW,
87 &jail_chflags_allowed, 0,
88 "Process in jail can set chflags(1)");
93 LIST_HEAD(prisonlist, prison);
94 struct prisonlist allprison = LIST_HEAD_INITIALIZER(&allprison);
97 kern_jail_attach(int jid)
99 struct proc *p = curthread->td_proc;
103 pr = prison_find(jid);
107 error = kern_chroot(&pr->pr_root);
113 p->p_ucred->cr_prison = pr;
114 p->p_flag |= P_JAILED;
122 * jail_args(syscallarg(struct jail *) jail)
125 sys_jail(struct jail_args *uap)
127 struct prison *pr, *tpr;
130 struct thread *td = curthread;
131 int error, tryprid, i;
133 struct nlookupdata nd;
135 struct sockaddr_storage *uips; /* Userland ips */
136 struct sockaddr_in ip4addr;
137 struct jail_ip_storage *jip;
142 uap->sysmsg_result = -1;
145 error = copyin(uap->jail, &jversion, sizeof jversion);
147 uap->sysmsg_result = -1;
150 pr = kmalloc(sizeof *pr , M_PRISON, M_WAITOK | M_ZERO);
151 SLIST_INIT(&pr->pr_ips);
155 error = copyin(uap->jail, &jv0, sizeof(struct jail_v0));
158 jip = kmalloc(sizeof(*jip), M_PRISON, M_WAITOK | M_ZERO);
159 ip4addr.sin_family = AF_INET;
160 ip4addr.sin_addr.s_addr = htonl(jv0.ip_number);
161 memcpy(&jip->ip, &ip4addr, sizeof(ip4addr));
162 SLIST_INSERT_HEAD(&pr->pr_ips, jip, entries);
165 error = copyin(uap->jail, &j, sizeof(j));
168 uips = kmalloc((sizeof(*uips) * j.n_ips), M_PRISON,
170 error = copyin(j.ips, uips, (sizeof(*uips) * j.n_ips));
172 kfree(uips, M_PRISON);
175 for (i = 0; i < j.n_ips; i++) {
176 jip = kmalloc(sizeof(*jip), M_PRISON,
178 memcpy(&jip->ip, &uips[i], sizeof(*uips));
179 SLIST_INSERT_HEAD(&pr->pr_ips, jip, entries);
181 kfree(uips, M_PRISON);
188 error = copyinstr(j.hostname, &pr->pr_host, sizeof pr->pr_host, 0);
191 error = nlookup_init(&nd, j.path, UIO_USERSPACE, NLC_FOLLOW);
193 goto nlookup_init_clean;
194 error = nlookup(&nd);
196 goto nlookup_init_clean;
197 cache_copy(&nd.nl_nch, &pr->pr_root);
199 varsymset_init(&pr->pr_varsymset, NULL);
200 prison_ipcache_init(pr);
202 tryprid = lastprid + 1;
203 if (tryprid == JAIL_MAX)
206 LIST_FOREACH(tpr, &allprison, pr_list) {
207 if (tpr->pr_id != tryprid)
210 if (tryprid == JAIL_MAX) {
216 pr->pr_id = lastprid = tryprid;
217 LIST_INSERT_HEAD(&allprison, pr, pr_list);
220 error = kern_jail_attach(pr->pr_id);
222 goto jail_attach_clean;
225 uap->sysmsg_result = pr->pr_id;
229 LIST_REMOVE(pr, pr_list);
231 varsymset_clean(&pr->pr_varsymset);
236 while (!SLIST_EMPTY(&pr->pr_ips)) {
237 jip = SLIST_FIRST(&pr->pr_ips);
238 SLIST_REMOVE_HEAD(&pr->pr_ips, entries);
246 * int jail_attach(int jid);
249 sys_jail_attach(struct jail_attach_args *uap)
251 struct thread *td = curthread;
258 return(kern_jail_attach(uap->jid));
262 prison_ipcache_init(struct prison *pr)
264 struct jail_ip_storage *jis;
265 struct sockaddr_in *ip4;
266 struct sockaddr_in6 *ip6;
268 SLIST_FOREACH(jis, &pr->pr_ips, entries) {
269 switch (jis->ip.ss_family) {
271 ip4 = (struct sockaddr_in *)&jis->ip;
272 if ((ntohl(ip4->sin_addr.s_addr) >> IN_CLASSA_NSHIFT) ==
274 /* loopback address */
275 if (pr->local_ip4 == NULL)
279 if (pr->nonlocal_ip4 == NULL)
280 pr->nonlocal_ip4 = ip4;
285 ip6 = (struct sockaddr_in6 *)&jis->ip;
286 if (IN6_IS_ADDR_LOOPBACK(&ip6->sin6_addr)) {
287 /* loopback address */
288 if (pr->local_ip6 == NULL)
292 if (pr->nonlocal_ip6 == NULL)
293 pr->nonlocal_ip6 = ip6;
301 * Changes INADDR_LOOPBACK for a valid jail address.
302 * ip is in network byte order.
303 * Returns 1 if the ip is among jail valid ips.
304 * Returns 0 if is not among jail valid ips or
305 * if couldn't replace INADDR_LOOPBACK for a valid
309 prison_replace_wildcards(struct thread *td, struct sockaddr *ip)
311 struct sockaddr_in *ip4 = (struct sockaddr_in *)ip;
312 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)ip;
315 if (td->td_proc == NULL)
317 if ((pr = td->td_proc->p_ucred->cr_prison) == NULL)
320 if ((ip->sa_family == AF_INET &&
321 ip4->sin_addr.s_addr == htonl(INADDR_ANY)) ||
322 (ip->sa_family == AF_INET6 &&
323 IN6_IS_ADDR_UNSPECIFIED(&ip6->sin6_addr)))
325 if ((ip->sa_family == AF_INET &&
326 ip4->sin_addr.s_addr == htonl(INADDR_LOOPBACK)) ||
327 (ip->sa_family == AF_INET6 &&
328 IN6_IS_ADDR_LOOPBACK(&ip6->sin6_addr))) {
329 if (!prison_get_local(pr, ip->sa_family, ip) &&
330 !prison_get_nonlocal(pr, ip->sa_family, ip))
335 if (jailed_ip(pr, ip))
341 prison_remote_ip(struct thread *td, struct sockaddr *ip)
343 struct sockaddr_in *ip4 = (struct sockaddr_in *)ip;
344 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)ip;
347 if (td == NULL || td->td_proc == NULL)
349 if ((pr = td->td_proc->p_ucred->cr_prison) == NULL)
351 if ((ip->sa_family == AF_INET &&
352 ip4->sin_addr.s_addr == htonl(INADDR_LOOPBACK)) ||
353 (ip->sa_family == AF_INET6 &&
354 IN6_IS_ADDR_LOOPBACK(&ip6->sin6_addr))) {
355 if (!prison_get_local(pr, ip->sa_family, ip) &&
356 !prison_get_nonlocal(pr, ip->sa_family, ip))
365 * Prison get non loopback ip:
366 * - af is the address family of the ip we want (AF_INET|AF_INET6).
367 * - If ip != NULL, put the first IP address that is not a loopback address
370 * ip is in network by order and we don't touch it unless we find a valid ip.
371 * No matter if ip == NULL or not, we return either a valid struct sockaddr *,
372 * or NULL. This struct may not be modified.
375 prison_get_nonlocal(struct prison *pr, sa_family_t af, struct sockaddr *ip)
377 struct sockaddr_in *ip4 = (struct sockaddr_in *)ip;
378 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)ip;
380 /* Check if it is cached */
383 if (ip4 != NULL && pr->nonlocal_ip4 != NULL)
384 ip4->sin_addr.s_addr = pr->nonlocal_ip4->sin_addr.s_addr;
385 return (struct sockaddr *)pr->nonlocal_ip4;
388 if (ip6 != NULL && pr->nonlocal_ip6 != NULL)
389 ip6->sin6_addr = pr->nonlocal_ip6->sin6_addr;
390 return (struct sockaddr *)pr->nonlocal_ip6;
398 * Prison get loopback ip.
399 * - af is the address family of the ip we want (AF_INET|AF_INET6).
400 * - If ip != NULL, put the first IP address that is not a loopback address
403 * ip is in network by order and we don't touch it unless we find a valid ip.
404 * No matter if ip == NULL or not, we return either a valid struct sockaddr *,
405 * or NULL. This struct may not be modified.
408 prison_get_local(struct prison *pr, sa_family_t af, struct sockaddr *ip)
410 struct sockaddr_in *ip4 = (struct sockaddr_in *)ip;
411 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)ip;
413 /* Check if it is cached */
416 if (ip4 != NULL && pr->local_ip4 != NULL)
417 ip4->sin_addr.s_addr = pr->local_ip4->sin_addr.s_addr;
418 return (struct sockaddr *)pr->local_ip4;
421 if (ip6 != NULL && pr->local_ip6 != NULL)
422 ip6->sin6_addr = pr->local_ip6->sin6_addr;
423 return (struct sockaddr *)pr->local_ip6;
430 /* Check if the IP is among ours, if it is return 1, else 0 */
432 jailed_ip(struct prison *pr, struct sockaddr *ip)
434 struct jail_ip_storage *jis;
435 struct sockaddr_in *jip4, *ip4;
436 struct sockaddr_in6 *jip6, *ip6;
440 ip4 = (struct sockaddr_in *)ip;
441 ip6 = (struct sockaddr_in6 *)ip;
442 SLIST_FOREACH(jis, &pr->pr_ips, entries) {
443 switch (ip->sa_family) {
445 jip4 = (struct sockaddr_in *) &jis->ip;
446 if (jip4->sin_family == AF_INET &&
447 ip4->sin_addr.s_addr == jip4->sin_addr.s_addr)
451 jip6 = (struct sockaddr_in6 *) &jis->ip;
452 if (jip6->sin6_family == AF_INET6 &&
453 IN6_ARE_ADDR_EQUAL(&ip6->sin6_addr,
464 prison_if(struct ucred *cred, struct sockaddr *sa)
467 struct sockaddr_in *sai = (struct sockaddr_in*) sa;
469 pr = cred->cr_prison;
471 if (((sai->sin_family != AF_INET) && (sai->sin_family != AF_INET6))
472 && jail_socket_unixiproute_only)
474 else if ((sai->sin_family != AF_INET) && (sai->sin_family != AF_INET6))
476 else if (jailed_ip(pr, sa))
482 * Returns a prison instance, or NULL on failure.
484 static struct prison *
485 prison_find(int prid)
489 LIST_FOREACH(pr, &allprison, pr_list) {
490 if (pr->pr_id == prid)
497 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
499 struct jail_ip_storage *jip;
501 struct sockaddr_in6 *jsin6;
503 struct sockaddr_in *jsin;
506 unsigned int jlssize, jlsused;
508 char *jls; /* Jail list */
509 char *oip; /* Output ip */
510 char *fullpath, *freepath;
513 p = curthread->td_proc;
515 if (jailed(p->p_ucred))
523 jlssize = (count * 1024);
524 jls = kmalloc(jlssize + 1, M_TEMP, M_WAITOK | M_ZERO);
525 if (count < prisoncount) {
531 LIST_FOREACH(pr, &allprison, pr_list) {
532 error = cache_fullpath(p, &pr->pr_root, &fullpath, &freepath);
535 if (jlsused && jlsused < jlssize)
536 jls[jlsused++] = '\n';
537 count = ksnprintf(jls + jlsused, (jlssize - jlsused),
539 pr->pr_id, pr->pr_host, fullpath);
540 kfree(freepath, M_TEMP);
546 SLIST_FOREACH(jip, &pr->pr_ips, entries) {
547 jsin = (struct sockaddr_in *)&jip->ip;
549 switch(jsin->sin_family) {
551 oip = inet_ntoa(jsin->sin_addr);
555 jsin6 = (struct sockaddr_in6 *)&jip->ip;
556 oip = ip6_sprintf(&jsin6->sin6_addr);
564 if ((jlssize - jlsused) < (strlen(oip) + 1)) {
568 count = ksnprintf(jls + jlsused, (jlssize - jlsused),
578 * pr_id <SPC> hostname1 <SPC> PATH1 <SPC> IP1 <SPC> IP2\npr_id...
580 error = SYSCTL_OUT(req, jls, jlsused);
586 SYSCTL_OID(_jail, OID_AUTO, list, CTLTYPE_STRING | CTLFLAG_RD, NULL, 0,
587 sysctl_jail_list, "A", "List of active jails");
590 prison_hold(struct prison *pr)
596 prison_free(struct prison *pr)
598 struct jail_ip_storage *jls;
599 KKASSERT(pr->pr_ref >= 1);
601 if (--pr->pr_ref > 0)
605 while (!SLIST_EMPTY(&pr->pr_ips)) {
606 jls = SLIST_FIRST(&pr->pr_ips);
607 SLIST_REMOVE_HEAD(&pr->pr_ips, entries);
610 LIST_REMOVE(pr, pr_list);
613 if (pr->pr_linux != NULL)
614 kfree(pr->pr_linux, M_PRISON);
615 varsymset_clean(&pr->pr_varsymset);
616 cache_drop(&pr->pr_root);