1/*-
2 * Copyright (c) 1999 Poul-Henning Kamp.
3 * Copyright (c) 2008 Bjoern A. Zeeb.
4 * Copyright (c) 2009 James Gritton.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
15 *
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
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: head/sys/kern/kern_jail.c 232278 2012-02-29 00:30:18Z mm $");
31
32#include "opt_compat.h"
33#include "opt_ddb.h"
34#include "opt_inet.h"
35#include "opt_inet6.h"
36
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>
44#include <sys/osd.h>
45#include <sys/priv.h>
46#include <sys/proc.h>
47#include <sys/taskqueue.h>
48#include <sys/fcntl.h>
49#include <sys/jail.h>
50#include <sys/lock.h>
51#include <sys/mutex.h>
52#include <sys/racct.h>
53#include <sys/refcount.h>
54#include <sys/sx.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>
63
64#include <net/if.h>
65#include <net/vnet.h>
66
67#include <netinet/in.h>
68
69#ifdef DDB
70#include <ddb/ddb.h>
71#ifdef INET6
72#include <netinet6/in6_var.h>
73#endif /* INET6 */
74#endif /* DDB */
75
76#include <security/mac/mac_framework.h>
77
78#define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000"
79
80MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
81static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures");
82
83/* Keep struct prison prison0 and some code in kern_jail_set() readable. */
84#ifdef INET
85#ifdef INET6
86#define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
87#else
88#define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
89#endif
90#else /* !INET */
91#ifdef INET6
92#define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
93#else
94#define _PR_IP_SADDRSEL 0
95#endif
96#endif
97
98/* prison0 describes what is "real" about the system. */
99struct prison prison0 = {
100 .pr_id = 0,
101 .pr_name = "0",
102 .pr_ref = 1,
103 .pr_uref = 1,
104 .pr_path = "/",
105 .pr_securelevel = -1,
106 .pr_devfs_rsnum = 0,
107 .pr_childmax = JAIL_MAX,
108 .pr_hostuuid = DEFAULT_HOSTUUID,
109 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
110#ifdef VIMAGE
111 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
112#else
113 .pr_flags = PR_HOST|_PR_IP_SADDRSEL,
114#endif
115 .pr_allow = PR_ALLOW_ALL,
116};
117MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
118
119/* allprison, allprison_racct and lastprid are protected by allprison_lock. */
120struct sx allprison_lock;
121SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
122struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
123LIST_HEAD(, prison_racct) allprison_racct;
124int lastprid = 0;
125
126static int do_jail_attach(struct thread *td, struct prison *pr);
127static void prison_complete(void *context, int pending);
128static void prison_deref(struct prison *pr, int flags);
129static char *prison_path(struct prison *pr1, struct prison *pr2);
130static void prison_remove_one(struct prison *pr);
131#ifdef RACCT
132static void prison_racct_attach(struct prison *pr);
133static void prison_racct_detach(struct prison *pr);
134#endif
135#ifdef INET
136static int _prison_check_ip4(struct prison *pr, struct in_addr *ia);
137static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4);
138#endif
139#ifdef INET6
140static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6);
141static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6);
142#endif
143
144/* Flags for prison_deref */
145#define PD_DEREF 0x01
146#define PD_DEUREF 0x02
147#define PD_LOCKED 0x04
148#define PD_LIST_SLOCKED 0x08
149#define PD_LIST_XLOCKED 0x10
150
151/*
152 * Parameter names corresponding to PR_* flag values. Size values are for kvm
153 * as we cannot figure out the size of a sparse array, or an array without a
154 * terminating entry.
155 */
156static char *pr_flag_names[] = {
157 [0] = "persist",
158#ifdef INET
159 [7] = "ip4.saddrsel",
160#endif
161#ifdef INET6
162 [8] = "ip6.saddrsel",
163#endif
164};
165const size_t pr_flag_names_size = sizeof(pr_flag_names);
166
167static char *pr_flag_nonames[] = {
168 [0] = "nopersist",
169#ifdef INET
170 [7] = "ip4.nosaddrsel",
171#endif
172#ifdef INET6
173 [8] = "ip6.nosaddrsel",
174#endif
175};
176const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames);
177
178struct jailsys_flags {
179 const char *name;
180 unsigned disable;
181 unsigned new;
182} pr_flag_jailsys[] = {
183 { "host", 0, PR_HOST },
184#ifdef VIMAGE
185 { "vnet", 0, PR_VNET },
186#endif
187#ifdef INET
188 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER },
189#endif
190#ifdef INET6
191 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER },
192#endif
193};
194const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
195
196static char *pr_allow_names[] = {
197 "allow.set_hostname",
198 "allow.sysvipc",
199 "allow.raw_sockets",
200 "allow.chflags",
201 "allow.mount",
202 "allow.quotas",
203 "allow.socket_af",
204 "allow.mount.devfs",
205 "allow.mount.nullfs",
206 "allow.mount.zfs",
207 "allow.mount.procfs",
208};
209const size_t pr_allow_names_size = sizeof(pr_allow_names);
210
211static char *pr_allow_nonames[] = {
212 "allow.noset_hostname",
213 "allow.nosysvipc",
214 "allow.noraw_sockets",
215 "allow.nochflags",
216 "allow.nomount",
217 "allow.noquotas",
218 "allow.nosocket_af",
219 "allow.mount.nodevfs",
220 "allow.mount.nonullfs",
221 "allow.mount.nozfs",
222 "allow.mount.noprocfs",
223};
224const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames);
225
226#define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME
227#define JAIL_DEFAULT_ENFORCE_STATFS 2
228#define JAIL_DEFAULT_DEVFS_RSNUM 0
229static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
230static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
231static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
232#if defined(INET) || defined(INET6)
233static unsigned jail_max_af_ips = 255;
234#endif
235
236#ifdef INET
237static int
238qcmp_v4(const void *ip1, const void *ip2)
239{
240 in_addr_t iaa, iab;
241
242 /*
243 * We need to compare in HBO here to get the list sorted as expected
244 * by the result of the code. Sorting NBO addresses gives you
245 * interesting results. If you do not understand, do not try.
246 */
247 iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
248 iab = ntohl(((const struct in_addr *)ip2)->s_addr);
249
250 /*
251 * Do not simply return the difference of the two numbers, the int is
252 * not wide enough.
253 */
254 if (iaa > iab)
255 return (1);
256 else if (iaa < iab)
257 return (-1);
258 else
259 return (0);
260}
261#endif
262
263#ifdef INET6
264static int
265qcmp_v6(const void *ip1, const void *ip2)
266{
267 const struct in6_addr *ia6a, *ia6b;
268 int i, rc;
269
270 ia6a = (const struct in6_addr *)ip1;
271 ia6b = (const struct in6_addr *)ip2;
272
273 rc = 0;
274 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
275 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
276 rc = 1;
277 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
278 rc = -1;
279 }
280 return (rc);
281}
282#endif
283
284/*
285 * struct jail_args {
286 * struct jail *jail;
287 * };
288 */
289int
290sys_jail(struct thread *td, struct jail_args *uap)
291{
292 uint32_t version;
293 int error;
294 struct jail j;
295
296 error = copyin(uap->jail, &version, sizeof(uint32_t));
297 if (error)
298 return (error);
299
300 switch (version) {
301 case 0:
302 {
303 struct jail_v0 j0;
304
305 /* FreeBSD single IPv4 jails. */
306 bzero(&j, sizeof(struct jail));
307 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
308 if (error)
309 return (error);
310 j.version = j0.version;
311 j.path = j0.path;
312 j.hostname = j0.hostname;
313 j.ip4s = j0.ip_number;
314 break;
315 }
316
317 case 1:
318 /*
319 * Version 1 was used by multi-IPv4 jail implementations
320 * that never made it into the official kernel.
321 */
322 return (EINVAL);
323
324 case 2: /* JAIL_API_VERSION */
325 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
326 error = copyin(uap->jail, &j, sizeof(struct jail));
327 if (error)
328 return (error);
329 break;
330
331 default:
332 /* Sci-Fi jails are not supported, sorry. */
333 return (EINVAL);
334 }
335 return (kern_jail(td, &j));
336}
337
338int
339kern_jail(struct thread *td, struct jail *j)
340{
341 struct iovec optiov[2 * (4
342 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0])
343#ifdef INET
344 + 1
345#endif
346#ifdef INET6
347 + 1
348#endif
349 )];
350 struct uio opt;
351 char *u_path, *u_hostname, *u_name;
352#ifdef INET
353 uint32_t ip4s;
354 struct in_addr *u_ip4;
355#endif
356#ifdef INET6
357 struct in6_addr *u_ip6;
358#endif
359 size_t tmplen;
360 int error, enforce_statfs, fi;
361
362 bzero(&optiov, sizeof(optiov));
363 opt.uio_iov = optiov;
364 opt.uio_iovcnt = 0;
365 opt.uio_offset = -1;
366 opt.uio_resid = -1;
367 opt.uio_segflg = UIO_SYSSPACE;
368 opt.uio_rw = UIO_READ;
369 opt.uio_td = td;
370
371 /* Set permissions for top-level jails from sysctls. */
372 if (!jailed(td->td_ucred)) {
373 for (fi = 0; fi < sizeof(pr_allow_names) /
374 sizeof(pr_allow_names[0]); fi++) {
375 optiov[opt.uio_iovcnt].iov_base =
376 (jail_default_allow & (1 << fi))
377 ? pr_allow_names[fi] : pr_allow_nonames[fi];
378 optiov[opt.uio_iovcnt].iov_len =
379 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
380 opt.uio_iovcnt += 2;
381 }
382 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
383 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
384 opt.uio_iovcnt++;
385 enforce_statfs = jail_default_enforce_statfs;
386 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
387 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
388 opt.uio_iovcnt++;
389 }
390
391 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
392#ifdef INET
393 ip4s = (j->version == 0) ? 1 : j->ip4s;
394 if (ip4s > jail_max_af_ips)
395 return (EINVAL);
396 tmplen += ip4s * sizeof(struct in_addr);
397#else
398 if (j->ip4s > 0)
399 return (EINVAL);
400#endif
401#ifdef INET6
402 if (j->ip6s > jail_max_af_ips)
403 return (EINVAL);
404 tmplen += j->ip6s * sizeof(struct in6_addr);
405#else
406 if (j->ip6s > 0)
407 return (EINVAL);
408#endif
409 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
410 u_hostname = u_path + MAXPATHLEN;
411 u_name = u_hostname + MAXHOSTNAMELEN;
412#ifdef INET
413 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
414#endif
415#ifdef INET6
416#ifdef INET
417 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
418#else
419 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
420#endif
421#endif
422 optiov[opt.uio_iovcnt].iov_base = "path";
423 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
424 opt.uio_iovcnt++;
425 optiov[opt.uio_iovcnt].iov_base = u_path;
426 error = copyinstr(j->path, u_path, MAXPATHLEN,
427 &optiov[opt.uio_iovcnt].iov_len);
428 if (error) {
429 free(u_path, M_TEMP);
430 return (error);
431 }
432 opt.uio_iovcnt++;
433 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
434 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
435 opt.uio_iovcnt++;
436 optiov[opt.uio_iovcnt].iov_base = u_hostname;
437 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
438 &optiov[opt.uio_iovcnt].iov_len);
439 if (error) {
440 free(u_path, M_TEMP);
441 return (error);
442 }
443 opt.uio_iovcnt++;
444 if (j->jailname != NULL) {
445 optiov[opt.uio_iovcnt].iov_base = "name";
446 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
447 opt.uio_iovcnt++;
448 optiov[opt.uio_iovcnt].iov_base = u_name;
449 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
450 &optiov[opt.uio_iovcnt].iov_len);
451 if (error) {
452 free(u_path, M_TEMP);
453 return (error);
454 }
455 opt.uio_iovcnt++;
456 }
457#ifdef INET
458 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
459 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
460 opt.uio_iovcnt++;
461 optiov[opt.uio_iovcnt].iov_base = u_ip4;
462 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
463 if (j->version == 0)
464 u_ip4->s_addr = j->ip4s;
465 else {
466 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
467 if (error) {
468 free(u_path, M_TEMP);
469 return (error);
470 }
471 }
472 opt.uio_iovcnt++;
473#endif
474#ifdef INET6
475 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
476 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
477 opt.uio_iovcnt++;
478 optiov[opt.uio_iovcnt].iov_base = u_ip6;
479 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
480 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
481 if (error) {
482 free(u_path, M_TEMP);
483 return (error);
484 }
485 opt.uio_iovcnt++;
486#endif
487 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]),
488 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
489 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
490 free(u_path, M_TEMP);
491 return (error);
492}
493
494
495/*
496 * struct jail_set_args {
497 * struct iovec *iovp;
498 * unsigned int iovcnt;
499 * int flags;
500 * };
501 */
502int
503sys_jail_set(struct thread *td, struct jail_set_args *uap)
504{
505 struct uio *auio;
506 int error;
507
508 /* Check that we have an even number of iovecs. */
509 if (uap->iovcnt & 1)
510 return (EINVAL);
511
512 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
513 if (error)
514 return (error);
515 error = kern_jail_set(td, auio, uap->flags);
516 free(auio, M_IOV);
517 return (error);
518}
519
520int
521kern_jail_set(struct thread *td, struct uio *optuio, int flags)
522{
523 struct nameidata nd;
524#ifdef INET
525 struct in_addr *ip4;
526#endif
527#ifdef INET6
528 struct in6_addr *ip6;
529#endif
530 struct vfsopt *opt;
531 struct vfsoptlist *opts;
532 struct prison *pr, *deadpr, *mypr, *ppr, *tpr;
533 struct vnode *root;
534 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
535 char *g_path;
536#if defined(INET) || defined(INET6)
537 struct prison *tppr;
538 void *op;
539#endif
540 unsigned long hid;
541 size_t namelen, onamelen;
542 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos;
543 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
544 int fi, jid, jsys, len, level;
545 int childmax, rsnum, slevel, vfslocked;
546 int fullpath_disabled;
547#if defined(INET) || defined(INET6)
548 int ii, ij;
549#endif
550#ifdef INET
551 int ip4s, redo_ip4;
552#endif
553#ifdef INET6
554 int ip6s, redo_ip6;
555#endif
556 uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
557 unsigned tallow;
558 char numbuf[12];
559
560 error = priv_check(td, PRIV_JAIL_SET);
561 if (!error && (flags & JAIL_ATTACH))
562 error = priv_check(td, PRIV_JAIL_ATTACH);
563 if (error)
564 return (error);
565 mypr = ppr = td->td_ucred->cr_prison;
566 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
567 return (EPERM);
568 if (flags & ~JAIL_SET_MASK)
569 return (EINVAL);
570
571 /*
572 * Check all the parameters before committing to anything. Not all
573 * errors can be caught early, but we may as well try. Also, this
574 * takes care of some expensive stuff (path lookup) before getting
575 * the allprison lock.
576 *
577 * XXX Jails are not filesystems, and jail parameters are not mount
578 * options. But it makes more sense to re-use the vfsopt code
579 * than duplicate it under a different name.
580 */
581 error = vfs_buildopts(optuio, &opts);
582 if (error)
583 return (error);
584#ifdef INET
585 ip4 = NULL;
586#endif
587#ifdef INET6
588 ip6 = NULL;
589#endif
590 g_path = NULL;
591
592 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
593 if (error == ENOENT)
594 jid = 0;
595 else if (error != 0)
596 goto done_free;
597
598 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
599 if (error == ENOENT)
600 gotslevel = 0;
601 else if (error != 0)
602 goto done_free;
603 else
604 gotslevel = 1;
605
606 error =
607 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
608 if (error == ENOENT)
609 gotchildmax = 0;
610 else if (error != 0)
611 goto done_free;
612 else
613 gotchildmax = 1;
614
615 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
616 if (error == ENOENT)
617 gotenforce = 0;
618 else if (error != 0)
619 goto done_free;
620 else if (enforce < 0 || enforce > 2) {
621 error = EINVAL;
622 goto done_free;
623 } else
624 gotenforce = 1;
625
626 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
627 if (error == ENOENT)
628 gotrsnum = 0;
629 else if (error != 0)
630 goto done_free;
631 else
632 gotrsnum = 1;
633
634 pr_flags = ch_flags = 0;
635 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
636 fi++) {
637 if (pr_flag_names[fi] == NULL)
638 continue;
639 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi);
640 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi);
641 }
642 ch_flags |= pr_flags;
643 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
644 fi++) {
645 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys,
646 sizeof(jsys));
647 if (error == ENOENT)
648 continue;
649 if (error != 0)
650 goto done_free;
651 switch (jsys) {
652 case JAIL_SYS_DISABLE:
653 if (!pr_flag_jailsys[fi].disable) {
654 error = EINVAL;
655 goto done_free;
656 }
657 pr_flags |= pr_flag_jailsys[fi].disable;
658 break;
659 case JAIL_SYS_NEW:
660 pr_flags |= pr_flag_jailsys[fi].new;
661 break;
662 case JAIL_SYS_INHERIT:
663 break;
664 default:
665 error = EINVAL;
666 goto done_free;
667 }
668 ch_flags |=
669 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable;
670 }
671 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE
672 && !(pr_flags & PR_PERSIST)) {
673 error = EINVAL;
674 vfs_opterror(opts, "new jail must persist or attach");
675 goto done_errmsg;
676 }
677#ifdef VIMAGE
678 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
679 error = EINVAL;
680 vfs_opterror(opts, "vnet cannot be changed after creation");
681 goto done_errmsg;
682 }
683#endif
684#ifdef INET
685 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
686 error = EINVAL;
687 vfs_opterror(opts, "ip4 cannot be changed after creation");
688 goto done_errmsg;
689 }
690#endif
691#ifdef INET6
692 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
693 error = EINVAL;
694 vfs_opterror(opts, "ip6 cannot be changed after creation");
695 goto done_errmsg;
696 }
697#endif
698
699 pr_allow = ch_allow = 0;
700 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
701 fi++) {
702 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi);
703 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi);
704 }
705 ch_allow |= pr_allow;
706
707 error = vfs_getopt(opts, "name", (void **)&name, &len);
708 if (error == ENOENT)
709 name = NULL;
710 else if (error != 0)
711 goto done_free;
712 else {
713 if (len == 0 || name[len - 1] != '\0') {
714 error = EINVAL;
715 goto done_free;
716 }
717 if (len > MAXHOSTNAMELEN) {
718 error = ENAMETOOLONG;
719 goto done_free;
720 }
721 }
722
723 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
724 if (error == ENOENT)
725 host = NULL;
726 else if (error != 0)
727 goto done_free;
728 else {
729 ch_flags |= PR_HOST;
730 pr_flags |= PR_HOST;
731 if (len == 0 || host[len - 1] != '\0') {
732 error = EINVAL;
733 goto done_free;
734 }
735 if (len > MAXHOSTNAMELEN) {
736 error = ENAMETOOLONG;
737 goto done_free;
738 }
739 }
740
741 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
742 if (error == ENOENT)
743 domain = NULL;
744 else if (error != 0)
745 goto done_free;
746 else {
747 ch_flags |= PR_HOST;
748 pr_flags |= PR_HOST;
749 if (len == 0 || domain[len - 1] != '\0') {
750 error = EINVAL;
751 goto done_free;
752 }
753 if (len > MAXHOSTNAMELEN) {
754 error = ENAMETOOLONG;
755 goto done_free;
756 }
757 }
758
759 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
760 if (error == ENOENT)
761 uuid = NULL;
762 else if (error != 0)
763 goto done_free;
764 else {
765 ch_flags |= PR_HOST;
766 pr_flags |= PR_HOST;
767 if (len == 0 || uuid[len - 1] != '\0') {
768 error = EINVAL;
769 goto done_free;
770 }
771 if (len > HOSTUUIDLEN) {
772 error = ENAMETOOLONG;
773 goto done_free;
774 }
775 }
776
777#ifdef COMPAT_FREEBSD32
778 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
779 uint32_t hid32;
780
781 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
782 hid = hid32;
783 } else
784#endif
785 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
786 if (error == ENOENT)
787 gothid = 0;
788 else if (error != 0)
789 goto done_free;
790 else {
791 gothid = 1;
792 ch_flags |= PR_HOST;
793 pr_flags |= PR_HOST;
794 }
795
796#ifdef INET
797 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
798 if (error == ENOENT)
799 ip4s = (pr_flags & PR_IP4_DISABLE) ? 0 : -1;
800 else if (error != 0)
801 goto done_free;
802 else if (ip4s & (sizeof(*ip4) - 1)) {
803 error = EINVAL;
804 goto done_free;
805 } else {
806 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE;
807 if (ip4s == 0)
808 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE;
809 else {
810 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER;
811 ip4s /= sizeof(*ip4);
812 if (ip4s > jail_max_af_ips) {
813 error = EINVAL;
814 vfs_opterror(opts, "too many IPv4 addresses");
815 goto done_errmsg;
816 }
817 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
818 bcopy(op, ip4, ip4s * sizeof(*ip4));
819 /*
820 * IP addresses are all sorted but ip[0] to preserve
821 * the primary IP address as given from userland.
822 * This special IP is used for unbound outgoing
823 * connections as well for "loopback" traffic in case
824 * source address selection cannot find any more fitting
825 * address to connect from.
826 */
827 if (ip4s > 1)
828 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4);
829 /*
830 * Check for duplicate addresses and do some simple
831 * zero and broadcast checks. If users give other bogus
832 * addresses it is their problem.
833 *
834 * We do not have to care about byte order for these
835 * checks so we will do them in NBO.
836 */
837 for (ii = 0; ii < ip4s; ii++) {
838 if (ip4[ii].s_addr == INADDR_ANY ||
839 ip4[ii].s_addr == INADDR_BROADCAST) {
840 error = EINVAL;
841 goto done_free;
842 }
843 if ((ii+1) < ip4s &&
844 (ip4[0].s_addr == ip4[ii+1].s_addr ||
845 ip4[ii].s_addr == ip4[ii+1].s_addr)) {
846 error = EINVAL;
847 goto done_free;
848 }
849 }
850 }
851 }
852#endif
853
854#ifdef INET6
855 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
856 if (error == ENOENT)
857 ip6s = (pr_flags & PR_IP6_DISABLE) ? 0 : -1;
858 else if (error != 0)
859 goto done_free;
860 else if (ip6s & (sizeof(*ip6) - 1)) {
861 error = EINVAL;
862 goto done_free;
863 } else {
864 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE;
865 if (ip6s == 0)
866 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE;
867 else {
868 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER;
869 ip6s /= sizeof(*ip6);
870 if (ip6s > jail_max_af_ips) {
871 error = EINVAL;
872 vfs_opterror(opts, "too many IPv6 addresses");
873 goto done_errmsg;
874 }
875 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
876 bcopy(op, ip6, ip6s * sizeof(*ip6));
877 if (ip6s > 1)
878 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6);
879 for (ii = 0; ii < ip6s; ii++) {
880 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
881 error = EINVAL;
882 goto done_free;
883 }
884 if ((ii+1) < ip6s &&
885 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
886 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
887 {
888 error = EINVAL;
889 goto done_free;
890 }
891 }
892 }
893 }
894#endif
895
896#if defined(VIMAGE) && (defined(INET) || defined(INET6))
897 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
898 error = EINVAL;
899 vfs_opterror(opts,
900 "vnet jails cannot have IP address restrictions");
901 goto done_errmsg;
902 }
903#endif
904
905 fullpath_disabled = 0;
906 root = NULL;
907 error = vfs_getopt(opts, "path", (void **)&path, &len);
908 if (error == ENOENT)
909 path = NULL;
910 else if (error != 0)
911 goto done_free;
912 else {
913 if (flags & JAIL_UPDATE) {
914 error = EINVAL;
915 vfs_opterror(opts,
916 "path cannot be changed after creation");
917 goto done_errmsg;
918 }
919 if (len == 0 || path[len - 1] != '\0') {
920 error = EINVAL;
921 goto done_free;
922 }
923 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE, UIO_SYSSPACE,
924 path, td);
925 error = namei(&nd);
926 if (error)
927 goto done_free;
928 vfslocked = NDHASGIANT(&nd);
929 root = nd.ni_vp;
930 NDFREE(&nd, NDF_ONLY_PNBUF);
931 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
932 strlcpy(g_path, path, MAXPATHLEN);
933 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
934 if (error == 0)
935 path = g_path;
936 else if (error == ENODEV) {
937 /* proceed if sysctl debug.disablefullpath == 1 */
938 fullpath_disabled = 1;
939 if (len < 2 || (len == 2 && path[0] == '/'))
940 path = NULL;
941 } else {
942 /* exit on other errors */
943 VFS_UNLOCK_GIANT(vfslocked);
944 goto done_free;
945 }
946 if (root->v_type != VDIR) {
947 error = ENOTDIR;
948 vput(root);
949 VFS_UNLOCK_GIANT(vfslocked);
950 goto done_free;
951 }
952 VOP_UNLOCK(root, 0);
953 VFS_UNLOCK_GIANT(vfslocked);
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;
959 goto done_free;
960 }
961 }
962 }
963
964 /*
965 * Grab the allprison lock before letting modules check their
966 * parameters. Once we have it, do not let go so we'll have a
967 * consistent view of the OSD list.
968 */
969 sx_xlock(&allprison_lock);
970 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts);
971 if (error)
972 goto done_unlock_list;
973
974 /* By now, all parameters should have been noted. */
975 TAILQ_FOREACH(opt, opts, link) {
976 if (!opt->seen && strcmp(opt->name, "errmsg")) {
977 error = EINVAL;
978 vfs_opterror(opts, "unknown parameter: %s", opt->name);
979 goto done_unlock_list;
980 }
981 }
982
983 /*
984 * See if we are creating a new record or updating an existing one.
985 * This abuses the file error codes ENOENT and EEXIST.
986 */
987 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
988 if (!cuflags) {
989 error = EINVAL;
990 vfs_opterror(opts, "no valid operation (create or update)");
991 goto done_unlock_list;
992 }
993 pr = NULL;
994 namelc = NULL;
995 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
996 namelc = strrchr(name, '.');
997 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
998 if (*p != '\0')
999 jid = 0;
1000 }
1001 if (jid != 0) {
1002 /*
1003 * See if a requested jid already exists. There is an
1004 * information leak here if the jid exists but is not within
1005 * the caller's jail hierarchy. Jail creators will get EEXIST
1006 * even though they cannot see the jail, and CREATE | UPDATE
1007 * will return ENOENT which is not normally a valid error.
1008 */
1009 if (jid < 0) {
1010 error = EINVAL;
1011 vfs_opterror(opts, "negative jid");
1012 goto done_unlock_list;
1013 }
1014 pr = prison_find(jid);
1015 if (pr != NULL) {
1016 ppr = pr->pr_parent;
1017 /* Create: jid must not exist. */
1018 if (cuflags == JAIL_CREATE) {
1019 mtx_unlock(&pr->pr_mtx);
1020 error = EEXIST;
1021 vfs_opterror(opts, "jail %d already exists",
1022 jid);
1023 goto done_unlock_list;
1024 }
1025 if (!prison_ischild(mypr, pr)) {
1026 mtx_unlock(&pr->pr_mtx);
1027 pr = NULL;
1028 } else if (pr->pr_uref == 0) {
1029 if (!(flags & JAIL_DYING)) {
1030 mtx_unlock(&pr->pr_mtx);
1031 error = ENOENT;
1032 vfs_opterror(opts, "jail %d is dying",
1033 jid);
1034 goto done_unlock_list;
1035 } else if ((flags & JAIL_ATTACH) ||
1036 (pr_flags & PR_PERSIST)) {
1037 /*
1038 * A dying jail might be resurrected
1039 * (via attach or persist), but first
1040 * it must determine if another jail
1041 * has claimed its name. Accomplish
1042 * this by implicitly re-setting the
1043 * name.
1044 */
1045 if (name == NULL)
1046 name = prison_name(mypr, pr);
1047 }
1048 }
1049 }
1050 if (pr == NULL) {
1051 /* Update: jid must exist. */
1052 if (cuflags == JAIL_UPDATE) {
1053 error = ENOENT;
1054 vfs_opterror(opts, "jail %d not found", jid);
1055 goto done_unlock_list;
1056 }
1057 }
1058 }
1059 /*
1060 * If the caller provided a name, look for a jail by that name.
1061 * This has different semantics for creates and updates keyed by jid
1062 * (where the name must not already exist in a different jail),
1063 * and updates keyed by the name itself (where the name must exist
1064 * because that is the jail being updated).
1065 */
1066 if (name != NULL) {
1067 namelc = strrchr(name, '.');
1068 if (namelc == NULL)
1069 namelc = name;
1070 else {
1071 /*
1072 * This is a hierarchical name. Split it into the
1073 * parent and child names, and make sure the parent
1074 * exists or matches an already found jail.
1075 */
1076 *namelc = '\0';
1077 if (pr != NULL) {
1078 if (strncmp(name, ppr->pr_name, namelc - name)
1079 || ppr->pr_name[namelc - name] != '\0') {
1080 mtx_unlock(&pr->pr_mtx);
1081 error = EINVAL;
1082 vfs_opterror(opts,
1083 "cannot change jail's parent");
1084 goto done_unlock_list;
1085 }
1086 } else {
1087 ppr = prison_find_name(mypr, name);
1088 if (ppr == NULL) {
1089 error = ENOENT;
1090 vfs_opterror(opts,
1091 "jail \"%s\" not found", name);
1092 goto done_unlock_list;
1093 }
1094 mtx_unlock(&ppr->pr_mtx);
1095 }
1096 name = ++namelc;
1097 }
1098 if (name[0] != '\0') {
1099 namelen =
1100 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1101 name_again:
1102 deadpr = NULL;
1103 FOREACH_PRISON_CHILD(ppr, tpr) {
1104 if (tpr != pr && tpr->pr_ref > 0 &&
1105 !strcmp(tpr->pr_name + namelen, name)) {
1106 if (pr == NULL &&
1107 cuflags != JAIL_CREATE) {
1108 mtx_lock(&tpr->pr_mtx);
1109 if (tpr->pr_ref > 0) {
1110 /*
1111 * Use this jail
1112 * for updates.
1113 */
1114 if (tpr->pr_uref > 0) {
1115 pr = tpr;
1116 break;
1117 }
1118 deadpr = tpr;
1119 }
1120 mtx_unlock(&tpr->pr_mtx);
1121 } else if (tpr->pr_uref > 0) {
1122 /*
1123 * Create, or update(jid):
1124 * name must not exist in an
1125 * active sibling jail.
1126 */
1127 error = EEXIST;
1128 if (pr != NULL)
1129 mtx_unlock(&pr->pr_mtx);
1130 vfs_opterror(opts,
1131 "jail \"%s\" already exists",
1132 name);
1133 goto done_unlock_list;
1134 }
1135 }
1136 }
1137 /* If no active jail is found, use a dying one. */
1138 if (deadpr != NULL && pr == NULL) {
1139 if (flags & JAIL_DYING) {
1140 mtx_lock(&deadpr->pr_mtx);
1141 if (deadpr->pr_ref == 0) {
1142 mtx_unlock(&deadpr->pr_mtx);
1143 goto name_again;
1144 }
1145 pr = deadpr;
1146 } else if (cuflags == JAIL_UPDATE) {
1147 error = ENOENT;
1148 vfs_opterror(opts,
1149 "jail \"%s\" is dying", name);
1150 goto done_unlock_list;
1151 }
1152 }
1153 /* Update: name must exist if no jid. */
1154 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1155 error = ENOENT;
1156 vfs_opterror(opts, "jail \"%s\" not found",
1157 name);
1158 goto done_unlock_list;
1159 }
1160 }
1161 }
1162 /* Update: must provide a jid or name. */
1163 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1164 error = ENOENT;
1165 vfs_opterror(opts, "update specified no jail");
1166 goto done_unlock_list;
1167 }
1168
1169 /* If there's no prison to update, create a new one and link it in. */
1170 if (pr == NULL) {
1171 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1172 if (tpr->pr_childcount >= tpr->pr_childmax) {
1173 error = EPERM;
1174 vfs_opterror(opts, "prison limit exceeded");
1175 goto done_unlock_list;
1176 }
1177 created = 1;
1178 mtx_lock(&ppr->pr_mtx);
1179 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) {
1180 mtx_unlock(&ppr->pr_mtx);
1181 error = ENOENT;
1182 vfs_opterror(opts, "parent jail went away!");
1183 goto done_unlock_list;
1184 }
1185 ppr->pr_ref++;
1186 ppr->pr_uref++;
1187 mtx_unlock(&ppr->pr_mtx);
1188 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1189 if (jid == 0) {
1190 /* Find the next free jid. */
1191 jid = lastprid + 1;
1192 findnext:
1193 if (jid == JAIL_MAX)
1194 jid = 1;
1195 TAILQ_FOREACH(tpr, &allprison, pr_list) {
1196 if (tpr->pr_id < jid)
1197 continue;
1198 if (tpr->pr_id > jid || tpr->pr_ref == 0) {
1199 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1200 break;
1201 }
1202 if (jid == lastprid) {
1203 error = EAGAIN;
1204 vfs_opterror(opts,
1205 "no available jail IDs");
1206 free(pr, M_PRISON);
1207 prison_deref(ppr, PD_DEREF |
1208 PD_DEUREF | PD_LIST_XLOCKED);
1209 goto done_releroot;
1210 }
1211 jid++;
1212 goto findnext;
1213 }
1214 lastprid = jid;
1215 } else {
1216 /*
1217 * The jail already has a jid (that did not yet exist),
1218 * so just find where to insert it.
1219 */
1220 TAILQ_FOREACH(tpr, &allprison, pr_list)
1221 if (tpr->pr_id >= jid) {
1222 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1223 break;
1224 }
1225 }
1226 if (tpr == NULL)
1227 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1228 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1229 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1230 tpr->pr_childcount++;
1231
1232 pr->pr_parent = ppr;
1233 pr->pr_id = jid;
1234
1235 /* Set some default values, and inherit some from the parent. */
1236 if (name == NULL)
1237 name = "";
1238 if (path == NULL) {
1239 path = "/";
1240 root = mypr->pr_root;
1241 vref(root);
1242 }
1243 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1244 pr->pr_flags |= PR_HOST;
1245#if defined(INET) || defined(INET6)
1246#ifdef VIMAGE
1247 if (!(pr_flags & PR_VNET))
1248#endif
1249 {
1250#ifdef INET
1251 if (!(ch_flags & PR_IP4_USER))
1252 pr->pr_flags |=
1253 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE;
1254 else if (!(pr_flags & PR_IP4_USER)) {
1255 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1256 if (ppr->pr_ip4 != NULL) {
1257 pr->pr_ip4s = ppr->pr_ip4s;
1258 pr->pr_ip4 = malloc(pr->pr_ip4s *
1259 sizeof(struct in_addr), M_PRISON,
1260 M_WAITOK);
1261 bcopy(ppr->pr_ip4, pr->pr_ip4,
1262 pr->pr_ip4s * sizeof(*pr->pr_ip4));
1263 }
1264 }
1265#endif
1266#ifdef INET6
1267 if (!(ch_flags & PR_IP6_USER))
1268 pr->pr_flags |=
1269 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE;
1270 else if (!(pr_flags & PR_IP6_USER)) {
1271 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1272 if (ppr->pr_ip6 != NULL) {
1273 pr->pr_ip6s = ppr->pr_ip6s;
1274 pr->pr_ip6 = malloc(pr->pr_ip6s *
1275 sizeof(struct in6_addr), M_PRISON,
1276 M_WAITOK);
1277 bcopy(ppr->pr_ip6, pr->pr_ip6,
1278 pr->pr_ip6s * sizeof(*pr->pr_ip6));
1279 }
1280 }
1281#endif
1282 }
1283#endif
1284 /* Source address selection is always on by default. */
1285 pr->pr_flags |= _PR_IP_SADDRSEL;
1286
1287 pr->pr_securelevel = ppr->pr_securelevel;
1288 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1289 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
1290 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
1291
1292 LIST_INIT(&pr->pr_children);
1293 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1294
1295#ifdef VIMAGE
1296 /* Allocate a new vnet if specified. */
1297 pr->pr_vnet = (pr_flags & PR_VNET)
1298 ? vnet_alloc() : ppr->pr_vnet;
1299#endif
1300 /*
1301 * Allocate a dedicated cpuset for each jail.
1302 * Unlike other initial settings, this may return an erorr.
1303 */
1304 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1305 if (error) {
1306 prison_deref(pr, PD_LIST_XLOCKED);
1307 goto done_releroot;
1308 }
1309
1310 mtx_lock(&pr->pr_mtx);
1311 /*
1312 * New prisons do not yet have a reference, because we do not
1313 * want other to see the incomplete prison once the
1314 * allprison_lock is downgraded.
1315 */
1316 } else {
1317 created = 0;
1318 /*
1319 * Grab a reference for existing prisons, to ensure they
1320 * continue to exist for the duration of the call.
1321 */
1322 pr->pr_ref++;
1323#if defined(VIMAGE) && (defined(INET) || defined(INET6))
1324 if ((pr->pr_flags & PR_VNET) &&
1325 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1326 error = EINVAL;
1327 vfs_opterror(opts,
1328 "vnet jails cannot have IP address restrictions");
1329 goto done_deref_locked;
1330 }
1331#endif
1332#ifdef INET
1333 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1334 error = EINVAL;
1335 vfs_opterror(opts,
1336 "ip4 cannot be changed after creation");
1337 goto done_deref_locked;
1338 }
1339#endif
1340#ifdef INET6
1341 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1342 error = EINVAL;
1343 vfs_opterror(opts,
1344 "ip6 cannot be changed after creation");
1345 goto done_deref_locked;
1346 }
1347#endif
1348 }
1349
1350 /* Do final error checking before setting anything. */
1351 if (gotslevel) {
1352 if (slevel < ppr->pr_securelevel) {
1353 error = EPERM;
1354 goto done_deref_locked;
1355 }
1356 }
1357 if (gotchildmax) {
1358 if (childmax >= ppr->pr_childmax) {
1359 error = EPERM;
1360 goto done_deref_locked;
1361 }
1362 }
1363 if (gotenforce) {
1364 if (enforce < ppr->pr_enforce_statfs) {
1365 error = EPERM;
1366 goto done_deref_locked;
1367 }
1368 }
1369 if (gotrsnum) {
1370 /*
1371 * devfs_rsnum is a uint16_t
1372 */
1373 if (rsnum < 0 || rsnum > 65535) {
1374 error = EINVAL;
1375 goto done_deref_locked;
1376 }
1377 /*
1378 * Nested jails always inherit parent's devfs ruleset
1379 */
1380 if (jailed(td->td_ucred)) {
1381 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
1382 error = EPERM;
1383 goto done_deref_locked;
1384 } else
1385 rsnum = ppr->pr_devfs_rsnum;
1386 }
1387 }
1388#ifdef INET
1389 if (ip4s > 0) {
1390 if (ppr->pr_flags & PR_IP4) {
1391 /*
1392 * Make sure the new set of IP addresses is a
1393 * subset of the parent's list. Don't worry
1394 * about the parent being unlocked, as any
1395 * setting is done with allprison_lock held.
1396 */
1397 for (ij = 0; ij < ppr->pr_ip4s; ij++)
1398 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
1399 break;
1400 if (ij == ppr->pr_ip4s) {
1401 error = EPERM;
1402 goto done_deref_locked;
1403 }
1404 if (ip4s > 1) {
1405 for (ii = ij = 1; ii < ip4s; ii++) {
1406 if (ip4[ii].s_addr ==
1407 ppr->pr_ip4[0].s_addr)
1408 continue;
1409 for (; ij < ppr->pr_ip4s; ij++)
1410 if (ip4[ii].s_addr ==
1411 ppr->pr_ip4[ij].s_addr)
1412 break;
1413 if (ij == ppr->pr_ip4s)
1414 break;
1415 }
1416 if (ij == ppr->pr_ip4s) {
1417 error = EPERM;
1418 goto done_deref_locked;
1419 }
1420 }
1421 }
1422 /*
1423 * Check for conflicting IP addresses. We permit them
1424 * if there is no more than one IP on each jail. If
1425 * there is a duplicate on a jail with more than one
1426 * IP stop checking and return error.
1427 */
1428 tppr = ppr;
1429#ifdef VIMAGE
1430 for (; tppr != &prison0; tppr = tppr->pr_parent)
1431 if (tppr->pr_flags & PR_VNET)
1432 break;
1433#endif
1434 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1435 if (tpr == pr ||
1436#ifdef VIMAGE
1437 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1438#endif
1439 tpr->pr_uref == 0) {
1440 descend = 0;
1441 continue;
1442 }
1443 if (!(tpr->pr_flags & PR_IP4_USER))
1444 continue;
1445 descend = 0;
1446 if (tpr->pr_ip4 == NULL ||
1447 (ip4s == 1 && tpr->pr_ip4s == 1))
1448 continue;
1449 for (ii = 0; ii < ip4s; ii++) {
1450 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) {
1451 error = EADDRINUSE;
1452 vfs_opterror(opts,
1453 "IPv4 addresses clash");
1454 goto done_deref_locked;
1455 }
1456 }
1457 }
1458 }
1459#endif
1460#ifdef INET6
1461 if (ip6s > 0) {
1462 if (ppr->pr_flags & PR_IP6) {
1463 /*
1464 * Make sure the new set of IP addresses is a
1465 * subset of the parent's list.
1466 */
1467 for (ij = 0; ij < ppr->pr_ip6s; ij++)
1468 if (IN6_ARE_ADDR_EQUAL(&ip6[0],
1469 &ppr->pr_ip6[ij]))
1470 break;
1471 if (ij == ppr->pr_ip6s) {
1472 error = EPERM;
1473 goto done_deref_locked;
1474 }
1475 if (ip6s > 1) {
1476 for (ii = ij = 1; ii < ip6s; ii++) {
1477 if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
1478 &ppr->pr_ip6[0]))
1479 continue;
1480 for (; ij < ppr->pr_ip6s; ij++)
1481 if (IN6_ARE_ADDR_EQUAL(
1482 &ip6[ii], &ppr->pr_ip6[ij]))
1483 break;
1484 if (ij == ppr->pr_ip6s)
1485 break;
1486 }
1487 if (ij == ppr->pr_ip6s) {
1488 error = EPERM;
1489 goto done_deref_locked;
1490 }
1491 }
1492 }
1493 /* Check for conflicting IP addresses. */
1494 tppr = ppr;
1495#ifdef VIMAGE
1496 for (; tppr != &prison0; tppr = tppr->pr_parent)
1497 if (tppr->pr_flags & PR_VNET)
1498 break;
1499#endif
1500 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1501 if (tpr == pr ||
1502#ifdef VIMAGE
1503 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1504#endif
1505 tpr->pr_uref == 0) {
1506 descend = 0;
1507 continue;
1508 }
1509 if (!(tpr->pr_flags & PR_IP6_USER))
1510 continue;
1511 descend = 0;
1512 if (tpr->pr_ip6 == NULL ||
1513 (ip6s == 1 && tpr->pr_ip6s == 1))
1514 continue;
1515 for (ii = 0; ii < ip6s; ii++) {
1516 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) {
1517 error = EADDRINUSE;
1518 vfs_opterror(opts,
1519 "IPv6 addresses clash");
1520 goto done_deref_locked;
1521 }
1522 }
1523 }
1524 }
1525#endif
1526 onamelen = namelen = 0;
1527 if (name != NULL) {
1528 /* Give a default name of the jid. */
1529 if (name[0] == '\0')
1530 snprintf(name = numbuf, sizeof(numbuf), "%d", jid);
1531 else if (*namelc == '0' || (strtoul(namelc, &p, 10) != jid &&
1532 *p == '\0')) {
1533 error = EINVAL;
1534 vfs_opterror(opts,
1535 "name cannot be numeric (unless it is the jid)");
1536 goto done_deref_locked;
1537 }
1538 /*
1539 * Make sure the name isn't too long for the prison or its
1540 * children.
1541 */
1542 onamelen = strlen(pr->pr_name);
1543 namelen = strlen(name);
1544 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) {
1545 error = ENAMETOOLONG;
1546 goto done_deref_locked;
1547 }
1548 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1549 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
1550 sizeof(pr->pr_name)) {
1551 error = ENAMETOOLONG;
1552 goto done_deref_locked;
1553 }
1554 }
1555 }
1556 if (pr_allow & ~ppr->pr_allow) {
1557 error = EPERM;
1558 goto done_deref_locked;
1559 }
1560
1561 /* Set the parameters of the prison. */
1562#ifdef INET
1563 redo_ip4 = 0;
1564 if (pr_flags & PR_IP4_USER) {
1565 pr->pr_flags |= PR_IP4;
1566 free(pr->pr_ip4, M_PRISON);
1567 pr->pr_ip4s = ip4s;
1568 pr->pr_ip4 = ip4;
1569 ip4 = NULL;
1570 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1571#ifdef VIMAGE
1572 if (tpr->pr_flags & PR_VNET) {
1573 descend = 0;
1574 continue;
1575 }
1576#endif
1577 if (prison_restrict_ip4(tpr, NULL)) {
1578 redo_ip4 = 1;
1579 descend = 0;
1580 }
1581 }
1582 }
1583#endif
1584#ifdef INET6
1585 redo_ip6 = 0;
1586 if (pr_flags & PR_IP6_USER) {
1587 pr->pr_flags |= PR_IP6;
1588 free(pr->pr_ip6, M_PRISON);
1589 pr->pr_ip6s = ip6s;
1590 pr->pr_ip6 = ip6;
1591 ip6 = NULL;
1592 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1593#ifdef VIMAGE
1594 if (tpr->pr_flags & PR_VNET) {
1595 descend = 0;
1596 continue;
1597 }
1598#endif
1599 if (prison_restrict_ip6(tpr, NULL)) {
1600 redo_ip6 = 1;
1601 descend = 0;
1602 }
1603 }
1604 }
1605#endif
1606 if (gotslevel) {
1607 pr->pr_securelevel = slevel;
1608 /* Set all child jails to be at least this level. */
1609 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1610 if (tpr->pr_securelevel < slevel)
1611 tpr->pr_securelevel = slevel;
1612 }
1613 if (gotchildmax) {
1614 pr->pr_childmax = childmax;
1615 /* Set all child jails to under this limit. */
1616 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
1617 if (tpr->pr_childmax > childmax - level)
1618 tpr->pr_childmax = childmax > level
1619 ? childmax - level : 0;
1620 }
1621 if (gotenforce) {
1622 pr->pr_enforce_statfs = enforce;
1623 /* Pass this restriction on to the children. */
1624 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1625 if (tpr->pr_enforce_statfs < enforce)
1626 tpr->pr_enforce_statfs = enforce;
1627 }
1628 if (gotrsnum) {
1629 pr->pr_devfs_rsnum = rsnum;
1630 /* Pass this restriction on to the children. */
1631 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1632 tpr->pr_devfs_rsnum = rsnum;
1633 }
1634 if (name != NULL) {
1635 if (ppr == &prison0)
1636 strlcpy(pr->pr_name, name, sizeof(pr->pr_name));
1637 else
1638 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
1639 ppr->pr_name, name);
1640 /* Change this component of child names. */
1641 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1642 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
1643 strlen(tpr->pr_name + onamelen) + 1);
1644 bcopy(pr->pr_name, tpr->pr_name, namelen);
1645 }
1646 }
1647 if (path != NULL) {
1648 /* Try to keep a real-rooted full pathname. */
1649 if (fullpath_disabled && path[0] == '/' &&
1650 strcmp(mypr->pr_path, "/"))
1651 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s",
1652 mypr->pr_path, path);
1653 else
1654 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
1655 pr->pr_root = root;
1656 }
1657 if (PR_HOST & ch_flags & ~pr_flags) {
1658 if (pr->pr_flags & PR_HOST) {
1659 /*
1660 * Copy the parent's host info. As with pr_ip4 above,
1661 * the lack of a lock on the parent is not a problem;
1662 * it is always set with allprison_lock at least
1663 * shared, and is held exclusively here.
1664 */
1665 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
1666 sizeof(pr->pr_hostname));
1667 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
1668 sizeof(pr->pr_domainname));
1669 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
1670 sizeof(pr->pr_hostuuid));
1671 pr->pr_hostid = pr->pr_parent->pr_hostid;
1672 }
1673 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
1674 /* Set this prison, and any descendants without PR_HOST. */
1675 if (host != NULL)
1676 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
1677 if (domain != NULL)
1678 strlcpy(pr->pr_domainname, domain,
1679 sizeof(pr->pr_domainname));
1680 if (uuid != NULL)
1681 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
1682 if (gothid)
1683 pr->pr_hostid = hid;
1684 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1685 if (tpr->pr_flags & PR_HOST)
1686 descend = 0;
1687 else {
1688 if (host != NULL)
1689 strlcpy(tpr->pr_hostname,
1690 pr->pr_hostname,
1691 sizeof(tpr->pr_hostname));
1692 if (domain != NULL)
1693 strlcpy(tpr->pr_domainname,
1694 pr->pr_domainname,
1695 sizeof(tpr->pr_domainname));
1696 if (uuid != NULL)
1697 strlcpy(tpr->pr_hostuuid,
1698 pr->pr_hostuuid,
1699 sizeof(tpr->pr_hostuuid));
1700 if (gothid)
1701 tpr->pr_hostid = hid;
1702 }
1703 }
1704 }
1705 if ((tallow = ch_allow & ~pr_allow)) {
1706 /* Clear allow bits in all children. */
1707 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1708 tpr->pr_allow &= ~tallow;
1709 }
1710 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
1711 /*
1712 * Persistent prisons get an extra reference, and prisons losing their
1713 * persist flag lose that reference. Only do this for existing prisons
1714 * for now, so new ones will remain unseen until after the module
1715 * handlers have completed.
1716 */
1717 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) {
1718 if (pr_flags & PR_PERSIST) {
1719 pr->pr_ref++;
1720 pr->pr_uref++;
1721 } else {
1722 pr->pr_ref--;
1723 pr->pr_uref--;
1724 }
1725 }
1726 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
1727 mtx_unlock(&pr->pr_mtx);
1728
1729#ifdef RACCT
1730 if (created)
1731 prison_racct_attach(pr);
1732#endif
1733
1734 /* Locks may have prevented a complete restriction of child IP
1735 * addresses. If so, allocate some more memory and try again.
1736 */
1737#ifdef INET
1738 while (redo_ip4) {
1739 ip4s = pr->pr_ip4s;
1740 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
1741 mtx_lock(&pr->pr_mtx);
1742 redo_ip4 = 0;
1743 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1744#ifdef VIMAGE
1745 if (tpr->pr_flags & PR_VNET) {
1746 descend = 0;
1747 continue;
1748 }
1749#endif
1750 if (prison_restrict_ip4(tpr, ip4)) {
1751 if (ip4 != NULL)
1752 ip4 = NULL;
1753 else
1754 redo_ip4 = 1;
1755 }
1756 }
1757 mtx_unlock(&pr->pr_mtx);
1758 }
1759#endif
1760#ifdef INET6
1761 while (redo_ip6) {
1762 ip6s = pr->pr_ip6s;
1763 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
1764 mtx_lock(&pr->pr_mtx);
1765 redo_ip6 = 0;
1766 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1767#ifdef VIMAGE
1768 if (tpr->pr_flags & PR_VNET) {
1769 descend = 0;
1770 continue;
1771 }
1772#endif
1773 if (prison_restrict_ip6(tpr, ip6)) {
1774 if (ip6 != NULL)
1775 ip6 = NULL;
1776 else
1777 redo_ip6 = 1;
1778 }
1779 }
1780 mtx_unlock(&pr->pr_mtx);
1781 }
1782#endif
1783
1784 /* Let the modules do their work. */
1785 sx_downgrade(&allprison_lock);
1786 if (created) {
1787 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
1788 if (error) {
1789 prison_deref(pr, PD_LIST_SLOCKED);
1790 goto done_errmsg;
1791 }
1792 }
1793 error = osd_jail_call(pr, PR_METHOD_SET, opts);
1794 if (error) {
1795 prison_deref(pr, created
1796 ? PD_LIST_SLOCKED
1797 : PD_DEREF | PD_LIST_SLOCKED);
1798 goto done_errmsg;
1799 }
1800
1801 /* Attach this process to the prison if requested. */
1802 if (flags & JAIL_ATTACH) {
1803 mtx_lock(&pr->pr_mtx);
1804 error = do_jail_attach(td, pr);
1805 if (error) {
1806 vfs_opterror(opts, "attach failed");
1807 if (!created)
1808 prison_deref(pr, PD_DEREF);
1809 goto done_errmsg;
1810 }
1811 }
1812
1813 /*
1814 * Now that it is all there, drop the temporary reference from existing
1815 * prisons. Or add a reference to newly created persistent prisons
1816 * (which was not done earlier so that the prison would not be publicly
1817 * visible).
1818 */
1819 if (!created) {
1820 prison_deref(pr, (flags & JAIL_ATTACH)
1821 ? PD_DEREF
1822 : PD_DEREF | PD_LIST_SLOCKED);
1823 } else {
1824 if (pr_flags & PR_PERSIST) {
1825 mtx_lock(&pr->pr_mtx);
1826 pr->pr_ref++;
1827 pr->pr_uref++;
1828 mtx_unlock(&pr->pr_mtx);
1829 }
1830 if (!(flags & JAIL_ATTACH))
1831 sx_sunlock(&allprison_lock);
1832 }
1833 td->td_retval[0] = pr->pr_id;
1834 goto done_errmsg;
1835
1836 done_deref_locked:
1837 prison_deref(pr, created
1838 ? PD_LOCKED | PD_LIST_XLOCKED
1839 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
1840 goto done_releroot;
1841 done_unlock_list:
1842 sx_xunlock(&allprison_lock);
1843 done_releroot:
1844 if (root != NULL) {
1845 vfslocked = VFS_LOCK_GIANT(root->v_mount);
1846 vrele(root);
1847 VFS_UNLOCK_GIANT(vfslocked);
1848 }
1849 done_errmsg:
1850 if (error) {
1851 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
1852 if (errmsg_len > 0) {
1853 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
1854 if (errmsg_pos > 0) {
1855 if (optuio->uio_segflg == UIO_SYSSPACE)
1856 bcopy(errmsg,
1857 optuio->uio_iov[errmsg_pos].iov_base,
1858 errmsg_len);
1859 else
1860 copyout(errmsg,
1861 optuio->uio_iov[errmsg_pos].iov_base,
1862 errmsg_len);
1863 }
1864 }
1865 }
1866 done_free:
1867#ifdef INET
1868 free(ip4, M_PRISON);
1869#endif
1870#ifdef INET6
1871 free(ip6, M_PRISON);
1872#endif
1873 if (g_path != NULL)
1874 free(g_path, M_TEMP);
1875 vfs_freeopts(opts);
1876 return (error);
1877}
1878
1879
1880/*
1881 * struct jail_get_args {
1882 * struct iovec *iovp;
1883 * unsigned int iovcnt;
1884 * int flags;
1885 * };
1886 */
1887int
1888sys_jail_get(struct thread *td, struct jail_get_args *uap)
1889{
1890 struct uio *auio;
1891 int error;
1892
1893 /* Check that we have an even number of iovecs. */
1894 if (uap->iovcnt & 1)
1895 return (EINVAL);
1896
1897 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
1898 if (error)
1899 return (error);
1900 error = kern_jail_get(td, auio, uap->flags);
1901 if (error == 0)
1902 error = copyout(auio->uio_iov, uap->iovp,
1903 uap->iovcnt * sizeof (struct iovec));
1904 free(auio, M_IOV);
1905 return (error);
1906}
1907
1908int
1909kern_jail_get(struct thread *td, struct uio *optuio, int flags)
1910{
1911 struct prison *pr, *mypr;
1912 struct vfsopt *opt;
1913 struct vfsoptlist *opts;
1914 char *errmsg, *name;
1915 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos;
1916
1917 if (flags & ~JAIL_GET_MASK)
1918 return (EINVAL);
1919
1920 /* Get the parameter list. */
1921 error = vfs_buildopts(optuio, &opts);
1922 if (error)
1923 return (error);
1924 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
1925 mypr = td->td_ucred->cr_prison;
1926
1927 /*
1928 * Find the prison specified by one of: lastjid, jid, name.
1929 */
1930 sx_slock(&allprison_lock);
1931 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
1932 if (error == 0) {
1933 TAILQ_FOREACH(pr, &allprison, pr_list) {
1934 if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
1935 mtx_lock(&pr->pr_mtx);
1936 if (pr->pr_ref > 0 &&
1937 (pr->pr_uref > 0 || (flags & JAIL_DYING)))
1938 break;
1939 mtx_unlock(&pr->pr_mtx);
1940 }
1941 }
1942 if (pr != NULL)
1943 goto found_prison;
1944 error = ENOENT;
1945 vfs_opterror(opts, "no jail after %d", jid);
1946 goto done_unlock_list;
1947 } else if (error != ENOENT)
1948 goto done_unlock_list;
1949
1950 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
1951 if (error == 0) {
1952 if (jid != 0) {
1953 pr = prison_find_child(mypr, jid);
1954 if (pr != NULL) {
1955 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1956 mtx_unlock(&pr->pr_mtx);
1957 error = ENOENT;
1958 vfs_opterror(opts, "jail %d is dying",
1959 jid);
1960 goto done_unlock_list;
1961 }
1962 goto found_prison;
1963 }
1964 error = ENOENT;
1965 vfs_opterror(opts, "jail %d not found", jid);
1966 goto done_unlock_list;
1967 }
1968 } else if (error != ENOENT)
1969 goto done_unlock_list;
1970
1971 error = vfs_getopt(opts, "name", (void **)&name, &len);
1972 if (error == 0) {
1973 if (len == 0 || name[len - 1] != '\0') {
1974 error = EINVAL;
1975 goto done_unlock_list;
1976 }
1977 pr = prison_find_name(mypr, name);
1978 if (pr != NULL) {
1979 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1980 mtx_unlock(&pr->pr_mtx);
1981 error = ENOENT;
1982 vfs_opterror(opts, "jail \"%s\" is dying",
1983 name);
1984 goto done_unlock_list;
1985 }
1986 goto found_prison;
1987 }
1988 error = ENOENT;
1989 vfs_opterror(opts, "jail \"%s\" not found", name);
1990 goto done_unlock_list;
1991 } else if (error != ENOENT)
1992 goto done_unlock_list;
1993
1994 vfs_opterror(opts, "no jail specified");
1995 error = ENOENT;
1996 goto done_unlock_list;
1997
1998 found_prison:
1999 /* Get the parameters of the prison. */
2000 pr->pr_ref++;
2001 locked = PD_LOCKED;
2002 td->td_retval[0] = pr->pr_id;
2003 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
2004 if (error != 0 && error != ENOENT)
2005 goto done_deref;
2006 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
2007 error = vfs_setopt(opts, "parent", &i, sizeof(i));
2008 if (error != 0 && error != ENOENT)
2009 goto done_deref;
2010 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
2011 if (error != 0 && error != ENOENT)
2012 goto done_deref;
2013 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
2014 sizeof(pr->pr_cpuset->cs_id));
2015 if (error != 0 && error != ENOENT)
2016 goto done_deref;
2017 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
2018 if (error != 0 && error != ENOENT)
2019 goto done_deref;
2020#ifdef INET
2021 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
2022 pr->pr_ip4s * sizeof(*pr->pr_ip4));
2023 if (error != 0 && error != ENOENT)
2024 goto done_deref;
2025#endif
2026#ifdef INET6
2027 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
2028 pr->pr_ip6s * sizeof(*pr->pr_ip6));
2029 if (error != 0 && error != ENOENT)
2030 goto done_deref;
2031#endif
2032 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
2033 sizeof(pr->pr_securelevel));
2034 if (error != 0 && error != ENOENT)
2035 goto done_deref;
2036 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
2037 sizeof(pr->pr_childcount));
2038 if (error != 0 && error != ENOENT)
2039 goto done_deref;
2040 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
2041 sizeof(pr->pr_childmax));
2042 if (error != 0 && error != ENOENT)
2043 goto done_deref;
2044 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
2045 if (error != 0 && error != ENOENT)
2046 goto done_deref;
2047 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
2048 if (error != 0 && error != ENOENT)
2049 goto done_deref;
2050 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
2051 if (error != 0 && error != ENOENT)
2052 goto done_deref;
2053#ifdef COMPAT_FREEBSD32
2054 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
2055 uint32_t hid32 = pr->pr_hostid;
2056
2057 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
2058 } else
2059#endif
2060 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
2061 sizeof(pr->pr_hostid));
2062 if (error != 0 && error != ENOENT)
2063 goto done_deref;
2064 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
2065 sizeof(pr->pr_enforce_statfs));
2066 if (error != 0 && error != ENOENT)
2067 goto done_deref;
2068 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
2069 sizeof(pr->pr_devfs_rsnum));
2070 if (error != 0 && error != ENOENT)
2071 goto done_deref;
2072 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
2073 fi++) {
2074 if (pr_flag_names[fi] == NULL)
2075 continue;
2076 i = (pr->pr_flags & (1 << fi)) ? 1 : 0;
2077 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i));
2078 if (error != 0 && error != ENOENT)
2079 goto done_deref;
2080 i = !i;
2081 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i));
2082 if (error != 0 && error != ENOENT)
2083 goto done_deref;
2084 }
2085 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
2086 fi++) {
2087 i = pr->pr_flags &
2088 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
2089 i = pr_flag_jailsys[fi].disable &&
2090 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE
2091 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW
2092 : JAIL_SYS_INHERIT;
2093 error =
2094 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i));
2095 if (error != 0 && error != ENOENT)
2096 goto done_deref;
2097 }
2098 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
2099 fi++) {
2100 if (pr_allow_names[fi] == NULL)
2101 continue;
2102 i = (pr->pr_allow & (1 << fi)) ? 1 : 0;
2103 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i));
2104 if (error != 0 && error != ENOENT)
2105 goto done_deref;
2106 i = !i;
2107 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i));
2108 if (error != 0 && error != ENOENT)
2109 goto done_deref;
2110 }
2111 i = (pr->pr_uref == 0);
2112 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2113 if (error != 0 && error != ENOENT)
2114 goto done_deref;
2115 i = !i;
2116 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2117 if (error != 0 && error != ENOENT)
2118 goto done_deref;
2119
2120 /* Get the module parameters. */
2121 mtx_unlock(&pr->pr_mtx);
2122 locked = 0;
2123 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2124 if (error)
2125 goto done_deref;
2126 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
2127
2128 /* By now, all parameters should have been noted. */
2129 TAILQ_FOREACH(opt, opts, link) {
2130 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2131 error = EINVAL;
2132 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2133 goto done_errmsg;
2134 }
2135 }
2136
2137 /* Write the fetched parameters back to userspace. */
2138 error = 0;
2139 TAILQ_FOREACH(opt, opts, link) {
2140 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2141 pos = 2 * opt->pos + 1;
2142 optuio->uio_iov[pos].iov_len = opt->len;
2143 if (opt->value != NULL) {
2144 if (optuio->uio_segflg == UIO_SYSSPACE) {
2145 bcopy(opt->value,
2146 optuio->uio_iov[pos].iov_base,
2147 opt->len);
2148 } else {
2149 error = copyout(opt->value,
2150 optuio->uio_iov[pos].iov_base,
2151 opt->len);
2152 if (error)
2153 break;
2154 }
2155 }
2156 }
2157 }
2158 goto done_errmsg;
2159
2160 done_deref:
2161 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
2162 goto done_errmsg;
2163
2164 done_unlock_list:
2165 sx_sunlock(&allprison_lock);
2166 done_errmsg:
2167 if (error && errmsg_pos >= 0) {
2168 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2169 errmsg_pos = 2 * errmsg_pos + 1;
2170 if (errmsg_len > 0) {
2171 if (optuio->uio_segflg == UIO_SYSSPACE)
2172 bcopy(errmsg,
2173 optuio->uio_iov[errmsg_pos].iov_base,
2174 errmsg_len);
2175 else
2176 copyout(errmsg,
2177 optuio->uio_iov[errmsg_pos].iov_base,
2178 errmsg_len);
2179 }
2180 }
2181 vfs_freeopts(opts);
2182 return (error);
2183}
2184
2185
2186/*
2187 * struct jail_remove_args {
2188 * int jid;
2189 * };
2190 */
2191int
2192sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
2193{
2194 struct prison *pr, *cpr, *lpr, *tpr;
2195 int descend, error;
2196
2197 error = priv_check(td, PRIV_JAIL_REMOVE);
2198 if (error)
2199 return (error);
2200
2201 sx_xlock(&allprison_lock);
2202 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2203 if (pr == NULL) {
2204 sx_xunlock(&allprison_lock);
2205 return (EINVAL);
2206 }
2207
2208 /* Remove all descendants of this prison, then remove this prison. */
2209 pr->pr_ref++;
2210 pr->pr_flags |= PR_REMOVE;
2211 if (!LIST_EMPTY(&pr->pr_children)) {
2212 mtx_unlock(&pr->pr_mtx);
2213 lpr = NULL;
2214 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
2215 mtx_lock(&cpr->pr_mtx);
2216 if (cpr->pr_ref > 0) {
2217 tpr = cpr;
2218 cpr->pr_ref++;
2219 cpr->pr_flags |= PR_REMOVE;
2220 } else {
2221 /* Already removed - do not do it again. */
2222 tpr = NULL;
2223 }
2224 mtx_unlock(&cpr->pr_mtx);
2225 if (lpr != NULL) {
2226 mtx_lock(&lpr->pr_mtx);
2227 prison_remove_one(lpr);
2228 sx_xlock(&allprison_lock);
2229 }
2230 lpr = tpr;
2231 }
2232 if (lpr != NULL) {
2233 mtx_lock(&lpr->pr_mtx);
2234 prison_remove_one(lpr);
2235 sx_xlock(&allprison_lock);
2236 }
2237 mtx_lock(&pr->pr_mtx);
2238 }
2239 prison_remove_one(pr);
2240 return (0);
2241}
2242
2243static void
2244prison_remove_one(struct prison *pr)
2245{
2246 struct proc *p;
2247 int deuref;
2248
2249 /* If the prison was persistent, it is not anymore. */
2250 deuref = 0;
2251 if (pr->pr_flags & PR_PERSIST) {
2252 pr->pr_ref--;
2253 deuref = PD_DEUREF;
2254 pr->pr_flags &= ~PR_PERSIST;
2255 }
2256
2257 /*
2258 * jail_remove added a reference. If that's the only one, remove
2259 * the prison now.
2260 */
2261 KASSERT(pr->pr_ref > 0,
2262 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
2263 if (pr->pr_ref == 1) {
2264 prison_deref(pr,
2265 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
2266 return;
2267 }
2268
2269 mtx_unlock(&pr->pr_mtx);
2270 sx_xunlock(&allprison_lock);
2271 /*
2272 * Kill all processes unfortunate enough to be attached to this prison.
2273 */
2274 sx_slock(&allproc_lock);
2275 LIST_FOREACH(p, &allproc, p_list) {
2276 PROC_LOCK(p);
2277 if (p->p_state != PRS_NEW && p->p_ucred &&
2278 p->p_ucred->cr_prison == pr)
2279 kern_psignal(p, SIGKILL);
2280 PROC_UNLOCK(p);
2281 }
2282 sx_sunlock(&allproc_lock);
2283 /* Remove the temporary reference added by jail_remove. */
2284 prison_deref(pr, deuref | PD_DEREF);
2285}
2286
2287
2288/*
2289 * struct jail_attach_args {
2290 * int jid;
2291 * };
2292 */
2293int
2294sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
2295{
2296 struct prison *pr;
2297 int error;
2298
2299 error = priv_check(td, PRIV_JAIL_ATTACH);
2300 if (error)
2301 return (error);
2302
2303 sx_slock(&allprison_lock);
2304 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2305 if (pr == NULL) {
2306 sx_sunlock(&allprison_lock);
2307 return (EINVAL);
2308 }
2309
2310 /*
2311 * Do not allow a process to attach to a prison that is not
2312 * considered to be "alive".
2313 */
2314 if (pr->pr_uref == 0) {
2315 mtx_unlock(&pr->pr_mtx);
2316 sx_sunlock(&allprison_lock);
2317 return (EINVAL);
2318 }
2319
2320 return (do_jail_attach(td, pr));
2321}
2322
2323static int
2324do_jail_attach(struct thread *td, struct prison *pr)
2325{
2326 struct prison *ppr;
2327 struct proc *p;
2328 struct ucred *newcred, *oldcred;
2329 int vfslocked, error;
2330
2331 /*
2332 * XXX: Note that there is a slight race here if two threads
2333 * in the same privileged process attempt to attach to two
2334 * different jails at the same time. It is important for
2335 * user processes not to do this, or they might end up with
2336 * a process root from one prison, but attached to the jail
2337 * of another.
2338 */
2339 pr->pr_ref++;
2340 pr->pr_uref++;
2341 mtx_unlock(&pr->pr_mtx);
2342
2343 /* Let modules do whatever they need to prepare for attaching. */
2344 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
2345 if (error) {
2346 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
2347 return (error);
2348 }
2349 sx_sunlock(&allprison_lock);
2350
2351 /*
2352 * Reparent the newly attached process to this jail.
2353 */
2354 ppr = td->td_ucred->cr_prison;
2355 p = td->td_proc;
2356 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
2357 if (error)
2358 goto e_revert_osd;
2359
2360 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
2361 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
2362 if ((error = change_dir(pr->pr_root, td)) != 0)
2363 goto e_unlock;
2364#ifdef MAC
2365 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
2366 goto e_unlock;
2367#endif
2368 VOP_UNLOCK(pr->pr_root, 0);
2369 if ((error = change_root(pr->pr_root, td)))
2370 goto e_unlock_giant;
2371 VFS_UNLOCK_GIANT(vfslocked);
2372
2373 newcred = crget();
2374 PROC_LOCK(p);
2375 oldcred = p->p_ucred;
2376 setsugid(p);
2377 crcopy(newcred, oldcred);
2378 newcred->cr_prison = pr;
2379 p->p_ucred = newcred;
2380 PROC_UNLOCK(p);
2381#ifdef RACCT
2382 racct_proc_ucred_changed(p, oldcred, newcred);
2383#endif
2384 crfree(oldcred);
2385 prison_deref(ppr, PD_DEREF | PD_DEUREF);
2386 return (0);
2387 e_unlock:
2388 VOP_UNLOCK(pr->pr_root, 0);
2389 e_unlock_giant:
2390 VFS_UNLOCK_GIANT(vfslocked);
2391 e_revert_osd:
2392 /* Tell modules this thread is still in its old jail after all. */
2393 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td);
2394 prison_deref(pr, PD_DEREF | PD_DEUREF);
2395 return (error);
2396}
2397
2398
2399/*
2400 * Returns a locked prison instance, or NULL on failure.
2401 */
2402struct prison *
2403prison_find(int prid)
2404{
2405 struct prison *pr;
2406
2407 sx_assert(&allprison_lock, SX_LOCKED);
2408 TAILQ_FOREACH(pr, &allprison, pr_list) {
2409 if (pr->pr_id == prid) {
2410 mtx_lock(&pr->pr_mtx);
2411 if (pr->pr_ref > 0)
2412 return (pr);
2413 mtx_unlock(&pr->pr_mtx);
2414 }
2415 }
2416 return (NULL);
2417}
2418
2419/*
2420 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
2421 */
2422struct prison *
2423prison_find_child(struct prison *mypr, int prid)
2424{
2425 struct prison *pr;
2426 int descend;
2427
2428 sx_assert(&allprison_lock, SX_LOCKED);
2429 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2430 if (pr->pr_id == prid) {
2431 mtx_lock(&pr->pr_mtx);
2432 if (pr->pr_ref > 0)
2433 return (pr);
2434 mtx_unlock(&pr->pr_mtx);
2435 }
2436 }
2437 return (NULL);
2438}
2439
2440/*
2441 * Look for the name relative to mypr. Returns a locked prison or NULL.
2442 */
2443struct prison *
2444prison_find_name(struct prison *mypr, const char *name)
2445{
2446 struct prison *pr, *deadpr;
2447 size_t mylen;
2448 int descend;
2449
2450 sx_assert(&allprison_lock, SX_LOCKED);
2451 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
2452 again:
2453 deadpr = NULL;
2454 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2455 if (!strcmp(pr->pr_name + mylen, name)) {
2456 mtx_lock(&pr->pr_mtx);
2457 if (pr->pr_ref > 0) {
2458 if (pr->pr_uref > 0)
2459 return (pr);
2460 deadpr = pr;
2461 }
2462 mtx_unlock(&pr->pr_mtx);
2463 }
2464 }
2465 /* There was no valid prison - perhaps there was a dying one. */
2466 if (deadpr != NULL) {
2467 mtx_lock(&deadpr->pr_mtx);
2468 if (deadpr->pr_ref == 0) {
2469 mtx_unlock(&deadpr->pr_mtx);
2470 goto again;
2471 }
2472 }
2473 return (deadpr);
2474}
2475
2476/*
2477 * See if a prison has the specific flag set.
2478 */
2479int
2480prison_flag(struct ucred *cred, unsigned flag)
2481{
2482
2483 /* This is an atomic read, so no locking is necessary. */
2484 return (cred->cr_prison->pr_flags & flag);
2485}
2486
2487int
2488prison_allow(struct ucred *cred, unsigned flag)
2489{
2490
2491 /* This is an atomic read, so no locking is necessary. */
2492 return (cred->cr_prison->pr_allow & flag);
2493}
2494
2495/*
2496 * Remove a prison reference. If that was the last reference, remove the
2497 * prison itself - but not in this context in case there are locks held.
2498 */
2499void
2500prison_free_locked(struct prison *pr)
2501{
2502
2503 mtx_assert(&pr->pr_mtx, MA_OWNED);
2504 pr->pr_ref--;
2505 if (pr->pr_ref == 0) {
2506 mtx_unlock(&pr->pr_mtx);
2507 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
2508 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2509 return;
2510 }
2511 mtx_unlock(&pr->pr_mtx);
2512}
2513
2514void
2515prison_free(struct prison *pr)
2516{
2517
2518 mtx_lock(&pr->pr_mtx);
2519 prison_free_locked(pr);
2520}
2521
2522static void
2523prison_complete(void *context, int pending)
2524{
2525
2526 prison_deref((struct prison *)context, 0);
2527}
2528
2529/*
2530 * Remove a prison reference (usually). This internal version assumes no
2531 * mutexes are held, except perhaps the prison itself. If there are no more
2532 * references, release and delist the prison. On completion, the prison lock
2533 * and the allprison lock are both unlocked.
2534 */
2535static void
2536prison_deref(struct prison *pr, int flags)
2537{
2538 struct prison *ppr, *tpr;
2539 int vfslocked;
2540
2541 if (!(flags & PD_LOCKED))
2542 mtx_lock(&pr->pr_mtx);
2543 for (;;) {
2544 if (flags & PD_DEUREF) {
2545 pr->pr_uref--;
2546 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0"));
2547 }
2548 if (flags & PD_DEREF)
2549 pr->pr_ref--;
2550 /* If the prison still has references, nothing else to do. */
2551 if (pr->pr_ref > 0) {
2552 mtx_unlock(&pr->pr_mtx);
2553 if (flags & PD_LIST_SLOCKED)
2554 sx_sunlock(&allprison_lock);
2555 else if (flags & PD_LIST_XLOCKED)
2556 sx_xunlock(&allprison_lock);
2557 return;
2558 }
2559
2560 mtx_unlock(&pr->pr_mtx);
2561 if (flags & PD_LIST_SLOCKED) {
2562 if (!sx_try_upgrade(&allprison_lock)) {
2563 sx_sunlock(&allprison_lock);
2564 sx_xlock(&allprison_lock);
2565 }
2566 } else if (!(flags & PD_LIST_XLOCKED))
2567 sx_xlock(&allprison_lock);
2568
2569 TAILQ_REMOVE(&allprison, pr, pr_list);
2570 LIST_REMOVE(pr, pr_sibling);
2571 ppr = pr->pr_parent;
2572 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
2573 tpr->pr_childcount--;
2574 sx_xunlock(&allprison_lock);
2575
2576#ifdef VIMAGE
2577 if (pr->pr_vnet != ppr->pr_vnet)
2578 vnet_destroy(pr->pr_vnet);
2579#endif
2580 if (pr->pr_root != NULL) {
2581 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
2582 vrele(pr->pr_root);
2583 VFS_UNLOCK_GIANT(vfslocked);
2584 }
2585 mtx_destroy(&pr->pr_mtx);
2586#ifdef INET
2587 free(pr->pr_ip4, M_PRISON);
2588#endif
2589#ifdef INET6
2590 free(pr->pr_ip6, M_PRISON);
2591#endif
2592 if (pr->pr_cpuset != NULL)
2593 cpuset_rel(pr->pr_cpuset);
2594 osd_jail_exit(pr);
2595#ifdef RACCT
2596 prison_racct_detach(pr);
2597#endif
2598 free(pr, M_PRISON);
2599
2600 /* Removing a prison frees a reference on its parent. */
2601 pr = ppr;
2602 mtx_lock(&pr->pr_mtx);
2603 flags = PD_DEREF | PD_DEUREF;
2604 }
2605}
2606
2607void
2608prison_hold_locked(struct prison *pr)
2609{
2610
2611 mtx_assert(&pr->pr_mtx, MA_OWNED);
2612 KASSERT(pr->pr_ref > 0,
2613 ("Trying to hold dead prison (jid=%d).", pr->pr_id));
2614 pr->pr_ref++;
2615}
2616
2617void
2618prison_hold(struct prison *pr)
2619{
2620
2621 mtx_lock(&pr->pr_mtx);
2622 prison_hold_locked(pr);
2623 mtx_unlock(&pr->pr_mtx);
2624}
2625
2626void
2627prison_proc_hold(struct prison *pr)
2628{
2629
2630 mtx_lock(&pr->pr_mtx);
2631 KASSERT(pr->pr_uref > 0,
2632 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
2633 pr->pr_uref++;
2634 mtx_unlock(&pr->pr_mtx);
2635}
2636
2637void
2638prison_proc_free(struct prison *pr)
2639{
2640
2641 mtx_lock(&pr->pr_mtx);
2642 KASSERT(pr->pr_uref > 0,
2643 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
2644 prison_deref(pr, PD_DEUREF | PD_LOCKED);
2645}
2646
2647
2648#ifdef INET
2649/*
2650 * Restrict a prison's IP address list with its parent's, possibly replacing
2651 * it. Return true if the replacement buffer was used (or would have been).
2652 */
2653static int
2654prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
2655{
2656 int ii, ij, used;
2657 struct prison *ppr;
2658
2659 ppr = pr->pr_parent;
2660 if (!(pr->pr_flags & PR_IP4_USER)) {
2661 /* This has no user settings, so just copy the parent's list. */
2662 if (pr->pr_ip4s < ppr->pr_ip4s) {
2663 /*
2664 * There's no room for the parent's list. Use the
2665 * new list buffer, which is assumed to be big enough
2666 * (if it was passed). If there's no buffer, try to
2667 * allocate one.
2668 */
2669 used = 1;
2670 if (newip4 == NULL) {
2671 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
2672 M_PRISON, M_NOWAIT);
2673 if (newip4 != NULL)
2674 used = 0;
2675 }
2676 if (newip4 != NULL) {
2677 bcopy(ppr->pr_ip4, newip4,
2678 ppr->pr_ip4s * sizeof(*newip4));
2679 free(pr->pr_ip4, M_PRISON);
2680 pr->pr_ip4 = newip4;
2681 pr->pr_ip4s = ppr->pr_ip4s;
2682 }
2683 return (used);
2684 }
2685 pr->pr_ip4s = ppr->pr_ip4s;
2686 if (pr->pr_ip4s > 0)
2687 bcopy(ppr->pr_ip4, pr->pr_ip4,
2688 pr->pr_ip4s * sizeof(*newip4));
2689 else if (pr->pr_ip4 != NULL) {
2690 free(pr->pr_ip4, M_PRISON);
2691 pr->pr_ip4 = NULL;
2692 }
2693 } else if (pr->pr_ip4s > 0) {
2694 /* Remove addresses that aren't in the parent. */
2695 for (ij = 0; ij < ppr->pr_ip4s; ij++)
2696 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
2697 break;
2698 if (ij < ppr->pr_ip4s)
2699 ii = 1;
2700 else {
2701 bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
2702 --pr->pr_ip4s * sizeof(*pr->pr_ip4));
2703 ii = 0;
2704 }
2705 for (ij = 1; ii < pr->pr_ip4s; ) {
2706 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
2707 ii++;
2708 continue;
2709 }
2710 switch (ij >= ppr->pr_ip4s ? -1 :
2711 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
2712 case -1:
2713 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
2714 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
2715 break;
2716 case 0:
2717 ii++;
2718 ij++;
2719 break;
2720 case 1:
2721 ij++;
2722 break;
2723 }
2724 }
2725 if (pr->pr_ip4s == 0) {
2726 pr->pr_flags |= PR_IP4_DISABLE;
2727 free(pr->pr_ip4, M_PRISON);
2728 pr->pr_ip4 = NULL;
2729 }
2730 }
2731 return (0);
2732}
2733
2734/*
2735 * Pass back primary IPv4 address of this jail.
2736 *
2737 * If not restricted return success but do not alter the address. Caller has
2738 * to make sure to initialize it correctly (e.g. INADDR_ANY).
2739 *
2740 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2741 * Address returned in NBO.
2742 */
2743int
2744prison_get_ip4(struct ucred *cred, struct in_addr *ia)
2745{
2746 struct prison *pr;
2747
2748 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2749 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2750
2751 pr = cred->cr_prison;
2752 if (!(pr->pr_flags & PR_IP4))
2753 return (0);
2754 mtx_lock(&pr->pr_mtx);
2755 if (!(pr->pr_flags & PR_IP4)) {
2756 mtx_unlock(&pr->pr_mtx);
2757 return (0);
2758 }
2759 if (pr->pr_ip4 == NULL) {
2760 mtx_unlock(&pr->pr_mtx);
2761 return (EAFNOSUPPORT);
2762 }
2763
2764 ia->s_addr = pr->pr_ip4[0].s_addr;
2765 mtx_unlock(&pr->pr_mtx);
2766 return (0);
2767}
2768
2769/*
2770 * Return 1 if we should do proper source address selection or are not jailed.
2771 * We will return 0 if we should bypass source address selection in favour
2772 * of the primary jail IPv4 address. Only in this case *ia will be updated and
2773 * returned in NBO.
2774 * Return EAFNOSUPPORT, in case this jail does not allow IPv4.
2775 */
2776int
2777prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
2778{
2779 struct prison *pr;
2780 struct in_addr lia;
2781 int error;
2782
2783 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2784 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2785
2786 if (!jailed(cred))
2787 return (1);
2788
2789 pr = cred->cr_prison;
2790 if (pr->pr_flags & PR_IP4_SADDRSEL)
2791 return (1);
2792
2793 lia.s_addr = INADDR_ANY;
2794 error = prison_get_ip4(cred, &lia);
2795 if (error)
2796 return (error);
2797 if (lia.s_addr == INADDR_ANY)
2798 return (1);
2799
2800 ia->s_addr = lia.s_addr;
2801 return (0);
2802}
2803
2804/*
2805 * Return true if pr1 and pr2 have the same IPv4 address restrictions.
2806 */
2807int
2808prison_equal_ip4(struct prison *pr1, struct prison *pr2)
2809{
2810
2811 if (pr1 == pr2)
2812 return (1);
2813
2814 /*
2815 * No need to lock since the PR_IP4_USER flag can't be altered for
2816 * existing prisons.
2817 */
2818 while (pr1 != &prison0 &&
2819#ifdef VIMAGE
2820 !(pr1->pr_flags & PR_VNET) &&
2821#endif
2822 !(pr1->pr_flags & PR_IP4_USER))
2823 pr1 = pr1->pr_parent;
2824 while (pr2 != &prison0 &&
2825#ifdef VIMAGE
2826 !(pr2->pr_flags & PR_VNET) &&
2827#endif
2828 !(pr2->pr_flags & PR_IP4_USER))
2829 pr2 = pr2->pr_parent;
2830 return (pr1 == pr2);
2831}
2832
2833/*
2834 * Make sure our (source) address is set to something meaningful to this
2835 * jail.
2836 *
2837 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2838 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2839 * doesn't allow IPv4. Address passed in in NBO and returned in NBO.
2840 */
2841int
2842prison_local_ip4(struct ucred *cred, struct in_addr *ia)
2843{
2844 struct prison *pr;
2845 struct in_addr ia0;
2846 int error;
2847
2848 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2849 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2850
2851 pr = cred->cr_prison;
2852 if (!(pr->pr_flags & PR_IP4))
2853 return (0);
2854 mtx_lock(&pr->pr_mtx);
2855 if (!(pr->pr_flags & PR_IP4)) {
2856 mtx_unlock(&pr->pr_mtx);
2857 return (0);
2858 }
2859 if (pr->pr_ip4 == NULL) {
2860 mtx_unlock(&pr->pr_mtx);
2861 return (EAFNOSUPPORT);
2862 }
2863
2864 ia0.s_addr = ntohl(ia->s_addr);
2865 if (ia0.s_addr == INADDR_LOOPBACK) {
2866 ia->s_addr = pr->pr_ip4[0].s_addr;
2867 mtx_unlock(&pr->pr_mtx);
2868 return (0);
2869 }
2870
2871 if (ia0.s_addr == INADDR_ANY) {
2872 /*
2873 * In case there is only 1 IPv4 address, bind directly.
2874 */
2875 if (pr->pr_ip4s == 1)
2876 ia->s_addr = pr->pr_ip4[0].s_addr;
2877 mtx_unlock(&pr->pr_mtx);
2878 return (0);
2879 }
2880
2881 error = _prison_check_ip4(pr, ia);
2882 mtx_unlock(&pr->pr_mtx);
2883 return (error);
2884}
2885
2886/*
2887 * Rewrite destination address in case we will connect to loopback address.
2888 *
2889 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2890 * Address passed in in NBO and returned in NBO.
2891 */
2892int
2893prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
2894{
2895 struct prison *pr;
2896
2897 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2898 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2899
2900 pr = cred->cr_prison;
2901 if (!(pr->pr_flags & PR_IP4))
2902 return (0);
2903 mtx_lock(&pr->pr_mtx);
2904 if (!(pr->pr_flags & PR_IP4)) {
2905 mtx_unlock(&pr->pr_mtx);
2906 return (0);
2907 }
2908 if (pr->pr_ip4 == NULL) {
2909 mtx_unlock(&pr->pr_mtx);
2910 return (EAFNOSUPPORT);
2911 }
2912
2913 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) {
2914 ia->s_addr = pr->pr_ip4[0].s_addr;
2915 mtx_unlock(&pr->pr_mtx);
2916 return (0);
2917 }
2918
2919 /*
2920 * Return success because nothing had to be changed.
2921 */
2922 mtx_unlock(&pr->pr_mtx);
2923 return (0);
2924}
2925
2926/*
2927 * Check if given address belongs to the jail referenced by cred/prison.
2928 *
2929 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2930 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2931 * doesn't allow IPv4. Address passed in in NBO.
2932 */
2933static int
2934_prison_check_ip4(struct prison *pr, struct in_addr *ia)
2935{
2936 int i, a, z, d;
2937
2938 /*
2939 * Check the primary IP.
2940 */
2941 if (pr->pr_ip4[0].s_addr == ia->s_addr)
2942 return (0);
2943
2944 /*
2945 * All the other IPs are sorted so we can do a binary search.
2946 */
2947 a = 0;
2948 z = pr->pr_ip4s - 2;
2949 while (a <= z) {
2950 i = (a + z) / 2;
2951 d = qcmp_v4(&pr->pr_ip4[i+1], ia);
2952 if (d > 0)
2953 z = i - 1;
2954 else if (d < 0)
2955 a = i + 1;
2956 else
2957 return (0);
2958 }
2959
2960 return (EADDRNOTAVAIL);
2961}
2962
2963int
2964prison_check_ip4(struct ucred *cred, struct in_addr *ia)
2965{
2966 struct prison *pr;
2967 int error;
2968
2969 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2970 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2971
2972 pr = cred->cr_prison;
2973 if (!(pr->pr_flags & PR_IP4))
2974 return (0);
2975 mtx_lock(&pr->pr_mtx);
2976 if (!(pr->pr_flags & PR_IP4)) {
2977 mtx_unlock(&pr->pr_mtx);
2978 return (0);
2979 }
2980 if (pr->pr_ip4 == NULL) {
2981 mtx_unlock(&pr->pr_mtx);
2982 return (EAFNOSUPPORT);
2983 }
2984
2985 error = _prison_check_ip4(pr, ia);
2986 mtx_unlock(&pr->pr_mtx);
2987 return (error);
2988}
2989#endif
2990
2991#ifdef INET6
2992static int
2993prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
2994{
2995 int ii, ij, used;
2996 struct prison *ppr;
2997
2998 ppr = pr->pr_parent;
2999 if (!(pr->pr_flags & PR_IP6_USER)) {
3000 /* This has no user settings, so just copy the parent's list. */
3001 if (pr->pr_ip6s < ppr->pr_ip6s) {
3002 /*
3003 * There's no room for the parent's list. Use the
3004 * new list buffer, which is assumed to be big enough
3005 * (if it was passed). If there's no buffer, try to
3006 * allocate one.
3007 */
3008 used = 1;
3009 if (newip6 == NULL) {
3010 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
3011 M_PRISON, M_NOWAIT);
3012 if (newip6 != NULL)
3013 used = 0;
3014 }
3015 if (newip6 != NULL) {
3016 bcopy(ppr->pr_ip6, newip6,
3017 ppr->pr_ip6s * sizeof(*newip6));
3018 free(pr->pr_ip6, M_PRISON);
3019 pr->pr_ip6 = newip6;
3020 pr->pr_ip6s = ppr->pr_ip6s;
3021 }
3022 return (used);
3023 }
3024 pr->pr_ip6s = ppr->pr_ip6s;
3025 if (pr->pr_ip6s > 0)
3026 bcopy(ppr->pr_ip6, pr->pr_ip6,
3027 pr->pr_ip6s * sizeof(*newip6));
3028 else if (pr->pr_ip6 != NULL) {
3029 free(pr->pr_ip6, M_PRISON);
3030 pr->pr_ip6 = NULL;
3031 }
3032 } else if (pr->pr_ip6s > 0) {
3033 /* Remove addresses that aren't in the parent. */
3034 for (ij = 0; ij < ppr->pr_ip6s; ij++)
3035 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
3036 &ppr->pr_ip6[ij]))
3037 break;
3038 if (ij < ppr->pr_ip6s)
3039 ii = 1;
3040 else {
3041 bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
3042 --pr->pr_ip6s * sizeof(*pr->pr_ip6));
3043 ii = 0;
3044 }
3045 for (ij = 1; ii < pr->pr_ip6s; ) {
3046 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
3047 &ppr->pr_ip6[0])) {
3048 ii++;
3049 continue;
3050 }
3051 switch (ij >= ppr->pr_ip4s ? -1 :
3052 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
3053 case -1:
3054 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
3055 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
3056 break;
3057 case 0:
3058 ii++;
3059 ij++;
3060 break;
3061 case 1:
3062 ij++;
3063 break;
3064 }
3065 }
3066 if (pr->pr_ip6s == 0) {
3067 pr->pr_flags |= PR_IP6_DISABLE;
3068 free(pr->pr_ip6, M_PRISON);
3069 pr->pr_ip6 = NULL;
3070 }
3071 }
3072 return 0;
3073}
3074
3075/*
3076 * Pass back primary IPv6 address for this jail.
3077 *
3078 * If not restricted return success but do not alter the address. Caller has
3079 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
3080 *
3081 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3082 */
3083int
3084prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
3085{
3086 struct prison *pr;
3087
3088 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3089 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3090
3091 pr = cred->cr_prison;
3092 if (!(pr->pr_flags & PR_IP6))
3093 return (0);
3094 mtx_lock(&pr->pr_mtx);
3095 if (!(pr->pr_flags & PR_IP6)) {
3096 mtx_unlock(&pr->pr_mtx);
3097 return (0);
3098 }
3099 if (pr->pr_ip6 == NULL) {
3100 mtx_unlock(&pr->pr_mtx);
3101 return (EAFNOSUPPORT);
3102 }
3103
3104 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3105 mtx_unlock(&pr->pr_mtx);
3106 return (0);
3107}
3108
3109/*
3110 * Return 1 if we should do proper source address selection or are not jailed.
3111 * We will return 0 if we should bypass source address selection in favour
3112 * of the primary jail IPv6 address. Only in this case *ia will be updated and
3113 * returned in NBO.
3114 * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
3115 */
3116int
3117prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
3118{
3119 struct prison *pr;
3120 struct in6_addr lia6;
3121 int error;
3122
3123 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3124 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3125
3126 if (!jailed(cred))
3127 return (1);
3128
3129 pr = cred->cr_prison;
3130 if (pr->pr_flags & PR_IP6_SADDRSEL)
3131 return (1);
3132
3133 lia6 = in6addr_any;
3134 error = prison_get_ip6(cred, &lia6);
3135 if (error)
3136 return (error);
3137 if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
3138 return (1);
3139
3140 bcopy(&lia6, ia6, sizeof(struct in6_addr));
3141 return (0);
3142}
3143
3144/*
3145 * Return true if pr1 and pr2 have the same IPv6 address restrictions.
3146 */
3147int
3148prison_equal_ip6(struct prison *pr1, struct prison *pr2)
3149{
3150
3151 if (pr1 == pr2)
3152 return (1);
3153
3154 while (pr1 != &prison0 &&
3155#ifdef VIMAGE
3156 !(pr1->pr_flags & PR_VNET) &&
3157#endif
3158 !(pr1->pr_flags & PR_IP6_USER))
3159 pr1 = pr1->pr_parent;
3160 while (pr2 != &prison0 &&
3161#ifdef VIMAGE
3162 !(pr2->pr_flags & PR_VNET) &&
3163#endif
3164 !(pr2->pr_flags & PR_IP6_USER))
3165 pr2 = pr2->pr_parent;
3166 return (pr1 == pr2);
3167}
3168
3169/*
3170 * Make sure our (source) address is set to something meaningful to this jail.
3171 *
3172 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
3173 * when needed while binding.
3174 *
3175 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3176 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3177 * doesn't allow IPv6.
3178 */
3179int
3180prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
3181{
3182 struct prison *pr;
3183 int error;
3184
3185 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3186 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3187
3188 pr = cred->cr_prison;
3189 if (!(pr->pr_flags & PR_IP6))
3190 return (0);
3191 mtx_lock(&pr->pr_mtx);
3192 if (!(pr->pr_flags & PR_IP6)) {
3193 mtx_unlock(&pr->pr_mtx);
3194 return (0);
3195 }
3196 if (pr->pr_ip6 == NULL) {
3197 mtx_unlock(&pr->pr_mtx);
3198 return (EAFNOSUPPORT);
3199 }
3200
3201 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3202 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3203 mtx_unlock(&pr->pr_mtx);
3204 return (0);
3205 }
3206
3207 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
3208 /*
3209 * In case there is only 1 IPv6 address, and v6only is true,
3210 * then bind directly.
3211 */
3212 if (v6only != 0 && pr->pr_ip6s == 1)
3213 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3214 mtx_unlock(&pr->pr_mtx);
3215 return (0);
3216 }
3217
3218 error = _prison_check_ip6(pr, ia6);
3219 mtx_unlock(&pr->pr_mtx);
3220 return (error);
3221}
3222
3223/*
3224 * Rewrite destination address in case we will connect to loopback address.
3225 *
3226 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3227 */
3228int
3229prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
3230{
3231 struct prison *pr;
3232
3233 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3234 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3235
3236 pr = cred->cr_prison;
3237 if (!(pr->pr_flags & PR_IP6))
3238 return (0);
3239 mtx_lock(&pr->pr_mtx);
3240 if (!(pr->pr_flags & PR_IP6)) {
3241 mtx_unlock(&pr->pr_mtx);
3242 return (0);
3243 }
3244 if (pr->pr_ip6 == NULL) {
3245 mtx_unlock(&pr->pr_mtx);
3246 return (EAFNOSUPPORT);
3247 }
3248
3249 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3250 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3251 mtx_unlock(&pr->pr_mtx);
3252 return (0);
3253 }
3254
3255 /*
3256 * Return success because nothing had to be changed.
3257 */
3258 mtx_unlock(&pr->pr_mtx);
3259 return (0);
3260}
3261
3262/*
3263 * Check if given address belongs to the jail referenced by cred/prison.
3264 *
3265 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3266 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3267 * doesn't allow IPv6.
3268 */
3269static int
3270_prison_check_ip6(struct prison *pr, struct in6_addr *ia6)
3271{
3272 int i, a, z, d;
3273
3274 /*
3275 * Check the primary IP.
3276 */
3277 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
3278 return (0);
3279
3280 /*
3281 * All the other IPs are sorted so we can do a binary search.
3282 */
3283 a = 0;
3284 z = pr->pr_ip6s - 2;
3285 while (a <= z) {
3286 i = (a + z) / 2;
3287 d = qcmp_v6(&pr->pr_ip6[i+1], ia6);
3288 if (d > 0)
3289 z = i - 1;
3290 else if (d < 0)
3291 a = i + 1;
3292 else
3293 return (0);
3294 }
3295
3296 return (EADDRNOTAVAIL);
3297}
3298
3299int
3300prison_check_ip6(struct ucred *cred, struct in6_addr *ia6)
3301{
3302 struct prison *pr;
3303 int error;
3304
3305 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3306 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3307
3308 pr = cred->cr_prison;
3309 if (!(pr->pr_flags & PR_IP6))
3310 return (0);
3311 mtx_lock(&pr->pr_mtx);
3312 if (!(pr->pr_flags & PR_IP6)) {
3313 mtx_unlock(&pr->pr_mtx);
3314 return (0);
3315 }
3316 if (pr->pr_ip6 == NULL) {
3317 mtx_unlock(&pr->pr_mtx);
3318 return (EAFNOSUPPORT);
3319 }
3320
3321 error = _prison_check_ip6(pr, ia6);
3322 mtx_unlock(&pr->pr_mtx);
3323 return (error);
3324}
3325#endif
3326
3327/*
3328 * Check if a jail supports the given address family.
3329 *
3330 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
3331 * if not.
3332 */
3333int
3334prison_check_af(struct ucred *cred, int af)
3335{
3336 struct prison *pr;
3337 int error;
3338
3339 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3340
3341 pr = cred->cr_prison;
3342#ifdef VIMAGE
3343 /* Prisons with their own network stack are not limited. */
3344 if (prison_owns_vnet(cred))
3345 return (0);
3346#endif
3347
3348 error = 0;
3349 switch (af)
3350 {
3351#ifdef INET
3352 case AF_INET:
3353 if (pr->pr_flags & PR_IP4)
3354 {
3355 mtx_lock(&pr->pr_mtx);
3356 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
3357 error = EAFNOSUPPORT;
3358 mtx_unlock(&pr->pr_mtx);
3359 }
3360 break;
3361#endif
3362#ifdef INET6
3363 case AF_INET6:
3364 if (pr->pr_flags & PR_IP6)
3365 {
3366 mtx_lock(&pr->pr_mtx);
3367 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
3368 error = EAFNOSUPPORT;
3369 mtx_unlock(&pr->pr_mtx);
3370 }
3371 break;
3372#endif
3373 case AF_LOCAL:
3374 case AF_ROUTE:
3375 break;
3376 default:
3377 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
3378 error = EAFNOSUPPORT;
3379 }
3380 return (error);
3381}
3382
3383/*
3384 * Check if given address belongs to the jail referenced by cred (wrapper to
3385 * prison_check_ip[46]).
3386 *
3387 * Returns 0 if jail doesn't restrict the address family or if address belongs
3388 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
3389 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
3390 */
3391int
3392prison_if(struct ucred *cred, struct sockaddr *sa)
3393{
3394#ifdef INET
3395 struct sockaddr_in *sai;
3396#endif
3397#ifdef INET6
3398 struct sockaddr_in6 *sai6;
3399#endif
3400 int error;
3401
3402 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3403 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
3404
3405#ifdef VIMAGE
3406 if (prison_owns_vnet(cred))
3407 return (0);
3408#endif
3409
3410 error = 0;
3411 switch (sa->sa_family)
3412 {
3413#ifdef INET
3414 case AF_INET:
3415 sai = (struct sockaddr_in *)sa;
3416 error = prison_check_ip4(cred, &sai->sin_addr);
3417 break;
3418#endif
3419#ifdef INET6
3420 case AF_INET6:
3421 sai6 = (struct sockaddr_in6 *)sa;
3422 error = prison_check_ip6(cred, &sai6->sin6_addr);
3423 break;
3424#endif
3425 default:
3426 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
3427 error = EAFNOSUPPORT;
3428 }
3429 return (error);
3430}
3431
3432/*
3433 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
3434 */
3435int
3436prison_check(struct ucred *cred1, struct ucred *cred2)
3437{
3438
3439 return ((cred1->cr_prison == cred2->cr_prison ||
3440 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
3441}
3442
3443/*
3444 * Return 1 if p2 is a child of p1, otherwise 0.
3445 */
3446int
3447prison_ischild(struct prison *pr1, struct prison *pr2)
3448{
3449
3450 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
3451 if (pr1 == pr2)
3452 return (1);
3453 return (0);
3454}
3455
3456/*
3457 * Return 1 if the passed credential is in a jail, otherwise 0.
3458 */
3459int
3460jailed(struct ucred *cred)
3461{
3462
3463 return (cred->cr_prison != &prison0);
3464}
3465
3466/*
3467 * Return 1 if the passed credential is in a jail and that jail does not
3468 * have its own virtual network stack, otherwise 0.
3469 */
3470int
3471jailed_without_vnet(struct ucred *cred)
3472{
3473
3474 if (!jailed(cred))
3475 return (0);
3476#ifdef VIMAGE
3477 if (prison_owns_vnet(cred))
3478 return (0);
3479#endif
3480
3481 return (1);
3482}
3483
3484/*
3485 * Return the correct hostname (domainname, et al) for the passed credential.
3486 */
3487void
3488getcredhostname(struct ucred *cred, char *buf, size_t size)
3489{
3490 struct prison *pr;
3491
3492 /*
3493 * A NULL credential can be used to shortcut to the physical
3494 * system's hostname.
3495 */
3496 pr = (cred != NULL) ? cred->cr_prison : &prison0;
3497 mtx_lock(&pr->pr_mtx);
3498 strlcpy(buf, pr->pr_hostname, size);
3499 mtx_unlock(&pr->pr_mtx);
3500}
3501
3502void
3503getcreddomainname(struct ucred *cred, char *buf, size_t size)
3504{
3505
3506 mtx_lock(&cred->cr_prison->pr_mtx);
3507 strlcpy(buf, cred->cr_prison->pr_domainname, size);
3508 mtx_unlock(&cred->cr_prison->pr_mtx);
3509}
3510
3511void
3512getcredhostuuid(struct ucred *cred, char *buf, size_t size)
3513{
3514
3515 mtx_lock(&cred->cr_prison->pr_mtx);
3516 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
3517 mtx_unlock(&cred->cr_prison->pr_mtx);
3518}
3519
3520void
3521getcredhostid(struct ucred *cred, unsigned long *hostid)
3522{
3523
3524 mtx_lock(&cred->cr_prison->pr_mtx);
3525 *hostid = cred->cr_prison->pr_hostid;
3526 mtx_unlock(&cred->cr_prison->pr_mtx);
3527}
3528
3529#ifdef VIMAGE
3530/*
3531 * Determine whether the prison represented by cred owns
3532 * its vnet rather than having it inherited.
3533 *
3534 * Returns 1 in case the prison owns the vnet, 0 otherwise.
3535 */
3536int
3537prison_owns_vnet(struct ucred *cred)
3538{
3539
3540 /*
3541 * vnets cannot be added/removed after jail creation,
3542 * so no need to lock here.
3543 */
3544 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
3545}
3546#endif
3547
3548/*
3549 * Determine whether the subject represented by cred can "see"
3550 * status of a mount point.
3551 * Returns: 0 for permitted, ENOENT otherwise.
3552 * XXX: This function should be called cr_canseemount() and should be
3553 * placed in kern_prot.c.
3554 */
3555int
3556prison_canseemount(struct ucred *cred, struct mount *mp)
3557{
3558 struct prison *pr;
3559 struct statfs *sp;
3560 size_t len;
3561
3562 pr = cred->cr_prison;
3563 if (pr->pr_enforce_statfs == 0)
3564 return (0);
3565 if (pr->pr_root->v_mount == mp)
3566 return (0);
3567 if (pr->pr_enforce_statfs == 2)
3568 return (ENOENT);
3569 /*
3570 * If jail's chroot directory is set to "/" we should be able to see
3571 * all mount-points from inside a jail.
3572 * This is ugly check, but this is the only situation when jail's
3573 * directory ends with '/'.
3574 */
3575 if (strcmp(pr->pr_path, "/") == 0)
3576 return (0);
3577 len = strlen(pr->pr_path);
3578 sp = &mp->mnt_stat;
3579 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
3580 return (ENOENT);
3581 /*
3582 * Be sure that we don't have situation where jail's root directory
3583 * is "/some/path" and mount point is "/some/pathpath".
3584 */
3585 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
3586 return (ENOENT);
3587 return (0);
3588}
3589
3590void
3591prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
3592{
3593 char jpath[MAXPATHLEN];
3594 struct prison *pr;
3595 size_t len;
3596
3597 pr = cred->cr_prison;
3598 if (pr->pr_enforce_statfs == 0)
3599 return;
3600 if (prison_canseemount(cred, mp) != 0) {
3601 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3602 strlcpy(sp->f_mntonname, "[restricted]",
3603 sizeof(sp->f_mntonname));
3604 return;
3605 }
3606 if (pr->pr_root->v_mount == mp) {
3607 /*
3608 * Clear current buffer data, so we are sure nothing from
3609 * the valid path left there.
3610 */
3611 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3612 *sp->f_mntonname = '/';
3613 return;
3614 }
3615 /*
3616 * If jail's chroot directory is set to "/" we should be able to see
3617 * all mount-points from inside a jail.
3618 */
3619 if (strcmp(pr->pr_path, "/") == 0)
3620 return;
3621 len = strlen(pr->pr_path);
3622 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
3623 /*
3624 * Clear current buffer data, so we are sure nothing from
3625 * the valid path left there.
3626 */
3627 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3628 if (*jpath == '\0') {
3629 /* Should never happen. */
3630 *sp->f_mntonname = '/';
3631 } else {
3632 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
3633 }
3634}
3635
3636/*
3637 * Check with permission for a specific privilege is granted within jail. We
3638 * have a specific list of accepted privileges; the rest are denied.
3639 */
3640int
3641prison_priv_check(struct ucred *cred, int priv)
3642{
3643
3644 if (!jailed(cred))
3645 return (0);
3646
3647#ifdef VIMAGE
3648 /*
3649 * Privileges specific to prisons with a virtual network stack.
3650 * There might be a duplicate entry here in case the privilege
3651 * is only granted conditionally in the legacy jail case.
3652 */
3653 switch (priv) {
3654#ifdef notyet
3655 /*
3656 * NFS-specific privileges.
3657 */
3658 case PRIV_NFS_DAEMON:
3659 case PRIV_NFS_LOCKD:
3660#endif
3661 /*
3662 * Network stack privileges.
3663 */
3664 case PRIV_NET_BRIDGE:
3665 case PRIV_NET_GRE:
3666 case PRIV_NET_BPF:
3667 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
3668 case PRIV_NET_ROUTE:
3669 case PRIV_NET_TAP:
3670 case PRIV_NET_SETIFMTU:
3671 case PRIV_NET_SETIFFLAGS:
3672 case PRIV_NET_SETIFCAP:
3673 case PRIV_NET_SETIFDESCR:
3674 case PRIV_NET_SETIFNAME :
3675 case PRIV_NET_SETIFMETRIC:
3676 case PRIV_NET_SETIFPHYS:
3677 case PRIV_NET_SETIFMAC:
3678 case PRIV_NET_ADDMULTI:
3679 case PRIV_NET_DELMULTI:
3680 case PRIV_NET_HWIOCTL:
3681 case PRIV_NET_SETLLADDR:
3682 case PRIV_NET_ADDIFGROUP:
3683 case PRIV_NET_DELIFGROUP:
3684 case PRIV_NET_IFCREATE:
3685 case PRIV_NET_IFDESTROY:
3686 case PRIV_NET_ADDIFADDR:
3687 case PRIV_NET_DELIFADDR:
3688 case PRIV_NET_LAGG:
3689 case PRIV_NET_GIF:
3690 case PRIV_NET_SETIFVNET:
3691 case PRIV_NET_SETIFFIB:
3692
3693 /*
3694 * 802.11-related privileges.
3695 */
3696 case PRIV_NET80211_GETKEY:
3697#ifdef notyet
3698 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */
3699#endif
3700
3701#ifdef notyet
3702 /*
3703 * AppleTalk privileges.
3704 */
3705 case PRIV_NETATALK_RESERVEDPORT:
3706
3707 /*
3708 * ATM privileges.
3709 */
3710 case PRIV_NETATM_CFG:
3711 case PRIV_NETATM_ADD:
3712 case PRIV_NETATM_DEL:
3713 case PRIV_NETATM_SET:
3714
3715 /*
3716 * Bluetooth privileges.
3717 */
3718 case PRIV_NETBLUETOOTH_RAW:
3719#endif
3720
3721 /*
3722 * Netgraph and netgraph module privileges.
3723 */
3724 case PRIV_NETGRAPH_CONTROL:
3725#ifdef notyet
3726 case PRIV_NETGRAPH_TTY:
3727#endif
3728
3729 /*
3730 * IPv4 and IPv6 privileges.
3731 */
3732 case PRIV_NETINET_IPFW:
3733 case PRIV_NETINET_DIVERT:
3734 case PRIV_NETINET_PF:
3735 case PRIV_NETINET_DUMMYNET:
3736 case PRIV_NETINET_CARP:
3737 case PRIV_NETINET_MROUTE:
3738 case PRIV_NETINET_RAW:
3739 case PRIV_NETINET_ADDRCTRL6:
3740 case PRIV_NETINET_ND6:
3741 case PRIV_NETINET_SCOPE6:
3742 case PRIV_NETINET_ALIFETIME6:
3743 case PRIV_NETINET_IPSEC:
3744 case PRIV_NETINET_BINDANY:
3745
3746#ifdef notyet
3747 /*
3748 * IPX/SPX privileges.
3749 */
3750 case PRIV_NETIPX_RESERVEDPORT:
3751 case PRIV_NETIPX_RAW:
3752
3753 /*
3754 * NCP privileges.
3755 */
3756 case PRIV_NETNCP:
3757
3758 /*
3759 * SMB privileges.
3760 */
3761 case PRIV_NETSMB:
3762#endif
3763
3764 /*
3765 * No default: or deny here.
3766 * In case of no permit fall through to next switch().
3767 */
3768 if (cred->cr_prison->pr_flags & PR_VNET)
3769 return (0);
3770 }
3771#endif /* VIMAGE */
3772
3773 switch (priv) {
3774
3775 /*
3776 * Allow ktrace privileges for root in jail.
3777 */
3778 case PRIV_KTRACE:
3779
3780#if 0
3781 /*
3782 * Allow jailed processes to configure audit identity and
3783 * submit audit records (login, etc). In the future we may
3784 * want to further refine the relationship between audit and
3785 * jail.
3786 */
3787 case PRIV_AUDIT_GETAUDIT:
3788 case PRIV_AUDIT_SETAUDIT:
3789 case PRIV_AUDIT_SUBMIT:
3790#endif
3791
3792 /*
3793 * Allow jailed processes to manipulate process UNIX
3794 * credentials in any way they see fit.
3795 */
3796 case PRIV_CRED_SETUID:
3797 case PRIV_CRED_SETEUID:
3798 case PRIV_CRED_SETGID:
3799 case PRIV_CRED_SETEGID:
3800 case PRIV_CRED_SETGROUPS:
3801 case PRIV_CRED_SETREUID:
3802 case PRIV_CRED_SETREGID:
3803 case PRIV_CRED_SETRESUID:
3804 case PRIV_CRED_SETRESGID:
3805
3806 /*
3807 * Jail implements visibility constraints already, so allow
3808 * jailed root to override uid/gid-based constraints.
3809 */
3810 case PRIV_SEEOTHERGIDS:
3811 case PRIV_SEEOTHERUIDS:
3812
3813 /*
3814 * Jail implements inter-process debugging limits already, so
3815 * allow jailed root various debugging privileges.
3816 */
3817 case PRIV_DEBUG_DIFFCRED:
3818 case PRIV_DEBUG_SUGID:
3819 case PRIV_DEBUG_UNPRIV:
3820
3821 /*
3822 * Allow jail to set various resource limits and login
3823 * properties, and for now, exceed process resource limits.
3824 */
3825 case PRIV_PROC_LIMIT:
3826 case PRIV_PROC_SETLOGIN:
3827 case PRIV_PROC_SETRLIMIT:
3828
3829 /*
3830 * System V and POSIX IPC privileges are granted in jail.
3831 */
3832 case PRIV_IPC_READ:
3833 case PRIV_IPC_WRITE:
3834 case PRIV_IPC_ADMIN:
3835 case PRIV_IPC_MSGSIZE:
3836 case PRIV_MQ_ADMIN:
3837
3838 /*
3839 * Jail operations within a jail work on child jails.
3840 */
3841 case PRIV_JAIL_ATTACH:
3842 case PRIV_JAIL_SET:
3843 case PRIV_JAIL_REMOVE:
3844
3845 /*
3846 * Jail implements its own inter-process limits, so allow
3847 * root processes in jail to change scheduling on other
3848 * processes in the same jail. Likewise for signalling.
3849 */
3850 case PRIV_SCHED_DIFFCRED:
3851 case PRIV_SCHED_CPUSET:
3852 case PRIV_SIGNAL_DIFFCRED:
3853 case PRIV_SIGNAL_SUGID:
3854
3855 /*
3856 * Allow jailed processes to write to sysctls marked as jail
3857 * writable.
3858 */
3859 case PRIV_SYSCTL_WRITEJAIL:
3860
3861 /*
3862 * Allow root in jail to manage a variety of quota
3863 * properties. These should likely be conditional on a
3864 * configuration option.
3865 */
3866 case PRIV_VFS_GETQUOTA:
3867 case PRIV_VFS_SETQUOTA:
3868
3869 /*
3870 * Since Jail relies on chroot() to implement file system
3871 * protections, grant many VFS privileges to root in jail.
3872 * Be careful to exclude mount-related and NFS-related
3873 * privileges.
3874 */
3875 case PRIV_VFS_READ:
3876 case PRIV_VFS_WRITE:
3877 case PRIV_VFS_ADMIN:
3878 case PRIV_VFS_EXEC:
3879 case PRIV_VFS_LOOKUP:
3880 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
3881 case PRIV_VFS_CHFLAGS_DEV:
3882 case PRIV_VFS_CHOWN:
3883 case PRIV_VFS_CHROOT:
3884 case PRIV_VFS_RETAINSUGID:
3885 case PRIV_VFS_FCHROOT:
3886 case PRIV_VFS_LINK:
3887 case PRIV_VFS_SETGID:
3888 case PRIV_VFS_STAT:
3889 case PRIV_VFS_STICKYFILE:
3890 return (0);
3891
3892 /*
3893 * Depending on the global setting, allow privilege of
3894 * setting system flags.
3895 */
3896 case PRIV_VFS_SYSFLAGS:
3897 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
3898 return (0);
3899 else
3900 return (EPERM);
3901
3902 /*
3903 * Depending on the global setting, allow privilege of
3904 * mounting/unmounting file systems.
3905 */
3906 case PRIV_VFS_MOUNT:
3907 case PRIV_VFS_UNMOUNT:
3908 case PRIV_VFS_MOUNT_NONUSER:
3909 case PRIV_VFS_MOUNT_OWNER:
3910 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT &&
3911 cred->cr_prison->pr_enforce_statfs < 2)
3912 return (0);
3913 else
3914 return (EPERM);
3915
3916 /*
3917 * Allow jailed root to bind reserved ports and reuse in-use
3918 * ports.
3919 */
3920 case PRIV_NETINET_RESERVEDPORT:
3921 case PRIV_NETINET_REUSEPORT:
3922 return (0);
3923
3924 /*
3925 * Allow jailed root to set certian IPv4/6 (option) headers.
3926 */
3927 case PRIV_NETINET_SETHDROPTS:
3928 return (0);
3929
3930 /*
3931 * Conditionally allow creating raw sockets in jail.
3932 */
3933 case PRIV_NETINET_RAW:
3934 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
3935 return (0);
3936 else
3937 return (EPERM);
3938
3939 /*
3940 * Since jail implements its own visibility limits on netstat
3941 * sysctls, allow getcred. This allows identd to work in
3942 * jail.
3943 */
3944 case PRIV_NETINET_GETCRED:
3945 return (0);
3946
3947 /*
3948 * Allow jailed root to set loginclass.
3949 */
3950 case PRIV_PROC_SETLOGINCLASS:
3951 return (0);
3952
3953 default:
3954 /*
3955 * In all remaining cases, deny the privilege request. This
3956 * includes almost all network privileges, many system
3957 * configuration privileges.
3958 */
3959 return (EPERM);
3960 }
3961}
3962
3963/*
3964 * Return the part of pr2's name that is relative to pr1, or the whole name
3965 * if it does not directly follow.
3966 */
3967
3968char *
3969prison_name(struct prison *pr1, struct prison *pr2)
3970{
3971 char *name;
3972
3973 /* Jails see themselves as "0" (if they see themselves at all). */
3974 if (pr1 == pr2)
3975 return "0";
3976 name = pr2->pr_name;
3977 if (prison_ischild(pr1, pr2)) {
3978 /*
3979 * pr1 isn't locked (and allprison_lock may not be either)
3980 * so its length can't be counted on. But the number of dots
3981 * can be counted on - and counted.
3982 */
3983 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
3984 name = strchr(name, '.') + 1;
3985 }
3986 return (name);
3987}
3988
3989/*
3990 * Return the part of pr2's path that is relative to pr1, or the whole path
3991 * if it does not directly follow.
3992 */
3993static char *
3994prison_path(struct prison *pr1, struct prison *pr2)
3995{
3996 char *path1, *path2;
3997 int len1;
3998
3999 path1 = pr1->pr_path;
4000 path2 = pr2->pr_path;
4001 if (!strcmp(path1, "/"))
4002 return (path2);
4003 len1 = strlen(path1);
4004 if (strncmp(path1, path2, len1))
4005 return (path2);
4006 if (path2[len1] == '\0')
4007 return "/";
4008 if (path2[len1] == '/')
4009 return (path2 + len1);
4010 return (path2);
4011}
4012
4013
4014/*
4015 * Jail-related sysctls.
4016 */
4017static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
4018 "Jails");
4019
4020static int
4021sysctl_jail_list(SYSCTL_HANDLER_ARGS)
4022{
4023 struct xprison *xp;
4024 struct prison *pr, *cpr;
4025#ifdef INET
4026 struct in_addr *ip4 = NULL;
4027 int ip4s = 0;
4028#endif
4029#ifdef INET6
4030 struct in6_addr *ip6 = NULL;
4031 int ip6s = 0;
4032#endif
4033 int descend, error;
4034
4035 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
4036 pr = req->td->td_ucred->cr_prison;
4037 error = 0;
4038 sx_slock(&allprison_lock);
4039 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
4040#if defined(INET) || defined(INET6)
4041 again:
4042#endif
4043 mtx_lock(&cpr->pr_mtx);
4044#ifdef INET
4045 if (cpr->pr_ip4s > 0) {
4046 if (ip4s < cpr->pr_ip4s) {
4047 ip4s = cpr->pr_ip4s;
4048 mtx_unlock(&cpr->pr_mtx);
4049 ip4 = realloc(ip4, ip4s *
4050 sizeof(struct in_addr), M_TEMP, M_WAITOK);
4051 goto again;
4052 }
4053 bcopy(cpr->pr_ip4, ip4,
4054 cpr->pr_ip4s * sizeof(struct in_addr));
4055 }
4056#endif
4057#ifdef INET6
4058 if (cpr->pr_ip6s > 0) {
4059 if (ip6s < cpr->pr_ip6s) {
4060 ip6s = cpr->pr_ip6s;
4061 mtx_unlock(&cpr->pr_mtx);
4062 ip6 = realloc(ip6, ip6s *
4063 sizeof(struct in6_addr), M_TEMP, M_WAITOK);
4064 goto again;
4065 }
4066 bcopy(cpr->pr_ip6, ip6,
4067 cpr->pr_ip6s * sizeof(struct in6_addr));
4068 }
4069#endif
4070 if (cpr->pr_ref == 0) {
4071 mtx_unlock(&cpr->pr_mtx);
4072 continue;
4073 }
4074 bzero(xp, sizeof(*xp));
4075 xp->pr_version = XPRISON_VERSION;
4076 xp->pr_id = cpr->pr_id;
4077 xp->pr_state = cpr->pr_uref > 0
4078 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
4079 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
4080 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
4081 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
4082#ifdef INET
4083 xp->pr_ip4s = cpr->pr_ip4s;
4084#endif
4085#ifdef INET6
4086 xp->pr_ip6s = cpr->pr_ip6s;
4087#endif
4088 mtx_unlock(&cpr->pr_mtx);
4089 error = SYSCTL_OUT(req, xp, sizeof(*xp));
4090 if (error)
4091 break;
4092#ifdef INET
4093 if (xp->pr_ip4s > 0) {
4094 error = SYSCTL_OUT(req, ip4,
4095 xp->pr_ip4s * sizeof(struct in_addr));
4096 if (error)
4097 break;
4098 }
4099#endif
4100#ifdef INET6
4101 if (xp->pr_ip6s > 0) {
4102 error = SYSCTL_OUT(req, ip6,
4103 xp->pr_ip6s * sizeof(struct in6_addr));
4104 if (error)
4105 break;
4106 }
4107#endif
4108 }
4109 sx_sunlock(&allprison_lock);
4110 free(xp, M_TEMP);
4111#ifdef INET
4112 free(ip4, M_TEMP);
4113#endif
4114#ifdef INET6
4115 free(ip6, M_TEMP);
4116#endif
4117 return (error);
4118}
4119
4120SYSCTL_OID(_security_jail, OID_AUTO, list,
4121 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4122 sysctl_jail_list, "S", "List of active jails");
4123
4124static int
4125sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
4126{
4127 int error, injail;
4128
4129 injail = jailed(req->td->td_ucred);
4130 error = SYSCTL_OUT(req, &injail, sizeof(injail));
4131
4132 return (error);
4133}
4134
4135SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
4136 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4137 sysctl_jail_jailed, "I", "Process in jail?");
4138
4139#if defined(INET) || defined(INET6)
4140SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
4141 &jail_max_af_ips, 0,
4142 "Number of IP addresses a jail may have at most per address family");
4143#endif
4144
4145/*
4146 * Default parameters for jail(2) compatability. For historical reasons,
4147 * the sysctl names have varying similarity to the parameter names. Prisons
4148 * just see their own parameters, and can't change them.
4149 */
4150static int
4151sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
4152{
4153 struct prison *pr;
4154 int allow, error, i;
4155
4156 pr = req->td->td_ucred->cr_prison;
4157 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
4158
4159 /* Get the current flag value, and convert it to a boolean. */
4160 i = (allow & arg2) ? 1 : 0;
4161 if (arg1 != NULL)
4162 i = !i;
4163 error = sysctl_handle_int(oidp, &i, 0, req);
4164 if (error || !req->newptr)
4165 return (error);
4166 i = i ? arg2 : 0;
4167 if (arg1 != NULL)
4168 i ^= arg2;
4169 /*
4170 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
4171 * for writing.
4172 */
4173 mtx_lock(&prison0.pr_mtx);
4174 jail_default_allow = (jail_default_allow & ~arg2) | i;
4175 mtx_unlock(&prison0.pr_mtx);
4176 return (0);
4177}
4178
4179SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
4180 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4181 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
4182 "Processes in jail can set their hostnames");
4183SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
4184 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4185 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
4186 "Processes in jail are limited to creating UNIX/IP/route sockets only");
4187SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
4188 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4189 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
4190 "Processes in jail can use System V IPC primitives");
4191SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
4192 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4193 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
4194 "Prison root can create raw sockets");
4195SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
4196 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4197 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
4198 "Processes in jail can alter system file flags");
4199SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
4200 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4201 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
4202 "Processes in jail can mount/unmount jail-friendly file systems");
4203SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed,
4204 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4205 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I",
4206 "Processes in jail can mount the devfs file system");
4207SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed,
4208 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4209 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I",
4210 "Processes in jail can mount the nullfs file system");
4211SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed,
4212 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4213 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I",
4214 "Processes in jail can mount the procfs file system");
4215SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed,
4216 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4217 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I",
4218 "Processes in jail can mount the zfs file system");
4219
4220static int
4221sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
4222{
4223 struct prison *pr;
4224 int level, error;
4225
4226 pr = req->td->td_ucred->cr_prison;
4227 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
4228 error = sysctl_handle_int(oidp, &level, 0, req);
4229 if (error || !req->newptr)
4230 return (error);
4231 *(int *)arg1 = level;
4232 return (0);
4233}
4234
4235SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
4236 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4237 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
4238 sysctl_jail_default_level, "I",
4239 "Processes in jail cannot see all mounted file systems");
4240
4241SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
4242 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
4243 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
4244 sysctl_jail_default_level, "I",
4245 "Ruleset for the devfs filesystem in jail");
4246
4247/*
4248 * Nodes to describe jail parameters. Maximum length of string parameters
4249 * is returned in the string itself, and the other parameters exist merely
4250 * to make themselves and their types known.
4251 */
4252SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0,
4253 "Jail parameters");
4254
4255int
4256sysctl_jail_param(SYSCTL_HANDLER_ARGS)
4257{
4258 int i;
4259 long l;
4260 size_t s;
4261 char numbuf[12];
4262
4263 switch (oidp->oid_kind & CTLTYPE)
4264 {
4265 case CTLTYPE_LONG:
4266 case CTLTYPE_ULONG:
4267 l = 0;
4268#ifdef SCTL_MASK32
4269 if (!(req->flags & SCTL_MASK32))
4270#endif
4271 return (SYSCTL_OUT(req, &l, sizeof(l)));
4272 case CTLTYPE_INT:
4273 case CTLTYPE_UINT:
4274 i = 0;
4275 return (SYSCTL_OUT(req, &i, sizeof(i)));
4276 case CTLTYPE_STRING:
4277 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
4278 return
4279 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
4280 case CTLTYPE_STRUCT:
4281 s = (size_t)arg2;
4282 return (SYSCTL_OUT(req, &s, sizeof(s)));
4283 }
4284 return (0);
4285}
4286
4287SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
4288SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
4289SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
4290SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
4291SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
4292 "I", "Jail secure level");
4293SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
4294 "I", "Jail cannot see all mounted file systems");
4295SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
4296 "I", "Ruleset for in-jail devfs mounts");
4297SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
4298 "B", "Jail persistence");
4299#ifdef VIMAGE
4300SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
4301 "E,jailsys", "Virtual network stack");
4302#endif
4303SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
4304 "B", "Jail is in the process of shutting down");
4305
4306SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
4307SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
4308 "I", "Current number of child jails");
4309SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
4310 "I", "Maximum number of child jails");
4311
4312SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
4313SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
4314 "Jail hostname");
4315SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
4316 "Jail NIS domainname");
4317SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
4318 "Jail host UUID");
4319SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
4320 "LU", "Jail host ID");
4321
4322SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
4323SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
4324
4325#ifdef INET
4326SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
4327 "Jail IPv4 address virtualization");
4328SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
4329 "S,in_addr,a", "Jail IPv4 addresses");
4330SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4331 "B", "Do (not) use IPv4 source address selection rather than the "
4332 "primary jail IPv4 address.");
4333#endif
4334#ifdef INET6
4335SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
4336 "Jail IPv6 address virtualization");
4337SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
4338 "S,in6_addr,a", "Jail IPv6 addresses");
4339SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4340 "B", "Do (not) use IPv6 source address selection rather than the "
4341 "primary jail IPv6 address.");
4342#endif
4343
4344SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
4345SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
4346 "B", "Jail may set hostname");
4347SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
4348 "B", "Jail may use SYSV IPC");
4349SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
4350 "B", "Jail may create raw sockets");
4351SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
4352 "B", "Jail may alter system file flags");
4353SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
4354 "B", "Jail may set file quotas");
4355SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
4356 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
4357
4358SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
4359SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
4360 "B", "Jail may mount/unmount jail-friendly file systems in general");
4361SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW,
4362 "B", "Jail may mount the devfs file system");
4363SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW,
4364 "B", "Jail may mount the nullfs file system");
4365SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW,
4366 "B", "Jail may mount the procfs file system");
4367SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW,
4368 "B", "Jail may mount the zfs file system");
4369
4370void
4371prison_racct_foreach(void (*callback)(struct racct *racct,
4372 void *arg2, void *arg3), void *arg2, void *arg3)
4373{
4374 struct prison_racct *prr;
4375
4376 sx_slock(&allprison_lock);
4377 LIST_FOREACH(prr, &allprison_racct, prr_next)
4378 (callback)(prr->prr_racct, arg2, arg3);
4379 sx_sunlock(&allprison_lock);
4380}
4381
4382static struct prison_racct *
4383prison_racct_find_locked(const char *name)
4384{
4385 struct prison_racct *prr;
4386
4387 sx_assert(&allprison_lock, SA_XLOCKED);
4388
4389 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
4390 return (NULL);
4391
4392 LIST_FOREACH(prr, &allprison_racct, prr_next) {
4393 if (strcmp(name, prr->prr_name) != 0)
4394 continue;
4395
4396 /* Found prison_racct with a matching name? */
4397 prison_racct_hold(prr);
4398 return (prr);
4399 }
4400
4401 /* Add new prison_racct. */
4402 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
4403 racct_create(&prr->prr_racct);
4404
4405 strcpy(prr->prr_name, name);
4406 refcount_init(&prr->prr_refcount, 1);
4407 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
4408
4409 return (prr);
4410}
4411
4412struct prison_racct *
4413prison_racct_find(const char *name)
4414{
4415 struct prison_racct *prr;
4416
4417 sx_xlock(&allprison_lock);
4418 prr = prison_racct_find_locked(name);
4419 sx_xunlock(&allprison_lock);
4420 return (prr);
4421}
4422
4423void
4424prison_racct_hold(struct prison_racct *prr)
4425{
4426
4427 refcount_acquire(&prr->prr_refcount);
4428}
4429
4430void
4431prison_racct_free(struct prison_racct *prr)
4432{
4433 int old;
4434
4435 old = prr->prr_refcount;
4436 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1))
4437 return;
4438
4439 sx_xlock(&allprison_lock);
4440 if (refcount_release(&prr->prr_refcount)) {
4441 racct_destroy(&prr->prr_racct);
4442 LIST_REMOVE(prr, prr_next);
4443 sx_xunlock(&allprison_lock);
4444 free(prr, M_PRISON_RACCT);
4445
4446 return;
4447 }
4448 sx_xunlock(&allprison_lock);
4449}
4450
4451#ifdef RACCT
4452static void
4453prison_racct_attach(struct prison *pr)
4454{
4455 struct prison_racct *prr;
4456
4457 prr = prison_racct_find_locked(pr->pr_name);
4458 KASSERT(prr != NULL, ("cannot find prison_racct"));
4459
4460 pr->pr_prison_racct = prr;
4461}
4462
4463static void
4464prison_racct_detach(struct prison *pr)
4465{
4466 prison_racct_free(pr->pr_prison_racct);
4467 pr->pr_prison_racct = NULL;
4468}
4469#endif /* RACCT */
4470
4471#ifdef DDB
4472
4473static void
4474db_show_prison(struct prison *pr)
4475{
4476 int fi;
4477#if defined(INET) || defined(INET6)
4478 int ii;
4479#endif
4480 unsigned jsf;
4481#ifdef INET6
4482 char ip6buf[INET6_ADDRSTRLEN];
4483#endif
4484
4485 db_printf("prison %p:\n", pr);
4486 db_printf(" jid = %d\n", pr->pr_id);
4487 db_printf(" name = %s\n", pr->pr_name);
4488 db_printf(" parent = %p\n", pr->pr_parent);
4489 db_printf(" ref = %d\n", pr->pr_ref);
4490 db_printf(" uref = %d\n", pr->pr_uref);
4491 db_printf(" path = %s\n", pr->pr_path);
4492 db_printf(" cpuset = %d\n", pr->pr_cpuset
4493 ? pr->pr_cpuset->cs_id : -1);
4494#ifdef VIMAGE
4495 db_printf(" vnet = %p\n", pr->pr_vnet);
4496#endif
4497 db_printf(" root = %p\n", pr->pr_root);
4498 db_printf(" securelevel = %d\n", pr->pr_securelevel);
4499 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
4500 db_printf(" children.max = %d\n", pr->pr_childmax);
4501 db_printf(" children.cur = %d\n", pr->pr_childcount);
4502 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
4503 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
4504 db_printf(" flags = 0x%x", pr->pr_flags);
4505 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
4506 fi++)
4507 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi)))
4508 db_printf(" %s", pr_flag_names[fi]);
4509 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
4510 fi++) {
4511 jsf = pr->pr_flags &
4512 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
4513 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name,
4514 pr_flag_jailsys[fi].disable &&
4515 (jsf == pr_flag_jailsys[fi].disable) ? "disable"
4516 : (jsf == pr_flag_jailsys[fi].new) ? "new"
4517 : "inherit");
4518 }
4519 db_printf(" allow = 0x%x", pr->pr_allow);
4520 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
4521 fi++)
4522 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi)))
4523 db_printf(" %s", pr_allow_names[fi]);
4524 db_printf("\n");
4525 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
4526 db_printf(" host.hostname = %s\n", pr->pr_hostname);
4527 db_printf(" host.domainname = %s\n", pr->pr_domainname);
4528 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
4529 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
4530#ifdef INET
4531 db_printf(" ip4s = %d\n", pr->pr_ip4s);
4532 for (ii = 0; ii < pr->pr_ip4s; ii++)
4533 db_printf(" %s %s\n",
4534 ii == 0 ? "ip4.addr =" : " ",
4535 inet_ntoa(pr->pr_ip4[ii]));
4536#endif
4537#ifdef INET6
4538 db_printf(" ip6s = %d\n", pr->pr_ip6s);
4539 for (ii = 0; ii < pr->pr_ip6s; ii++)
4540 db_printf(" %s %s\n",
4541 ii == 0 ? "ip6.addr =" : " ",
4542 ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
4543#endif
4544}
4545
4546DB_SHOW_COMMAND(prison, db_show_prison_command)
4547{
4548 struct prison *pr;
4549
4550 if (!have_addr) {
4551 /*
4552 * Show all prisons in the list, and prison0 which is not
4553 * listed.
4554 */
4555 db_show_prison(&prison0);
4556 if (!db_pager_quit) {
4557 TAILQ_FOREACH(pr, &allprison, pr_list) {
4558 db_show_prison(pr);
4559 if (db_pager_quit)
4560 break;
4561 }
4562 }
4563 return;
4564 }
4565
4566 if (addr == 0)
4567 pr = &prison0;
4568 else {
4569 /* Look for a prison with the ID and with references. */
4570 TAILQ_FOREACH(pr, &allprison, pr_list)
4571 if (pr->pr_id == addr && pr->pr_ref > 0)
4572 break;
4573 if (pr == NULL)
4574 /* Look again, without requiring a reference. */
4575 TAILQ_FOREACH(pr, &allprison, pr_list)
4576 if (pr->pr_id == addr)
4577 break;
4578 if (pr == NULL)
4579 /* Assume address points to a valid prison. */
4580 pr = (struct prison *)addr;
4581 }
4582 db_show_prison(pr);
4583}
4584
4585#endif /* DDB */