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 219819 2011-03-21 09:40:01Z jeff $");
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/sx.h>
53#include <sys/sysent.h>
54#include <sys/namei.h>
55#include <sys/mount.h>
56#include <sys/queue.h>
57#include <sys/socket.h>
58#include <sys/syscallsubr.h>
59#include <sys/sysctl.h>
60#include <sys/vnode.h>
61
62#include <net/if.h>
63#include <net/vnet.h>
64
65#include <netinet/in.h>
66
67#ifdef DDB
68#include <ddb/ddb.h>
69#ifdef INET6
70#include <netinet6/in6_var.h>
71#endif /* INET6 */
72#endif /* DDB */
73
74#include <security/mac/mac_framework.h>
75
76#define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000"
77
78MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
79
80/* Keep struct prison prison0 and some code in kern_jail_set() readable. */
81#ifdef INET
82#ifdef INET6
83#define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
84#else
85#define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
86#endif
87#else /* !INET */
88#ifdef INET6
89#define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
90#else
91#define _PR_IP_SADDRSEL 0
92#endif
93#endif
94
95/* prison0 describes what is "real" about the system. */
96struct prison prison0 = {
97 .pr_id = 0,
98 .pr_name = "0",
99 .pr_ref = 1,
100 .pr_uref = 1,
101 .pr_path = "/",
102 .pr_securelevel = -1,
103 .pr_childmax = JAIL_MAX,
104 .pr_hostuuid = DEFAULT_HOSTUUID,
105 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
106#ifdef VIMAGE
107 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
108#else
109 .pr_flags = PR_HOST|_PR_IP_SADDRSEL,
110#endif
111 .pr_allow = PR_ALLOW_ALL,
112};
113MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
114
115/* allprison and lastprid are protected by allprison_lock. */
116struct sx allprison_lock;
117SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
118struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
119int lastprid = 0;
120
121static int do_jail_attach(struct thread *td, struct prison *pr);
122static void prison_complete(void *context, int pending);
123static void prison_deref(struct prison *pr, int flags);
124static char *prison_path(struct prison *pr1, struct prison *pr2);
125static void prison_remove_one(struct prison *pr);
126#ifdef INET
127static int _prison_check_ip4(struct prison *pr, struct in_addr *ia);
128static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4);
129#endif
130#ifdef INET6
131static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6);
132static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6);
133#endif
134
135/* Flags for prison_deref */
136#define PD_DEREF 0x01
137#define PD_DEUREF 0x02
138#define PD_LOCKED 0x04
139#define PD_LIST_SLOCKED 0x08
140#define PD_LIST_XLOCKED 0x10
141
142/*
143 * Parameter names corresponding to PR_* flag values. Size values are for kvm
144 * as we cannot figure out the size of a sparse array, or an array without a
145 * terminating entry.
146 */
147static char *pr_flag_names[] = {
148 [0] = "persist",
149#ifdef INET
150 [7] = "ip4.saddrsel",
151#endif
152#ifdef INET6
153 [8] = "ip6.saddrsel",
154#endif
155};
156const size_t pr_flag_names_size = sizeof(pr_flag_names);
157
158static char *pr_flag_nonames[] = {
159 [0] = "nopersist",
160#ifdef INET
161 [7] = "ip4.nosaddrsel",
162#endif
163#ifdef INET6
164 [8] = "ip6.nosaddrsel",
165#endif
166};
167const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames);
168
169struct jailsys_flags {
170 const char *name;
171 unsigned disable;
172 unsigned new;
173} pr_flag_jailsys[] = {
174 { "host", 0, PR_HOST },
175#ifdef VIMAGE
176 { "vnet", 0, PR_VNET },
177#endif
178#ifdef INET
179 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER },
180#endif
181#ifdef INET6
182 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER },
183#endif
184};
185const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
186
187static char *pr_allow_names[] = {
188 "allow.set_hostname",
189 "allow.sysvipc",
190 "allow.raw_sockets",
191 "allow.chflags",
192 "allow.mount",
193 "allow.quotas",
194 "allow.socket_af",
195};
196const size_t pr_allow_names_size = sizeof(pr_allow_names);
197
198static char *pr_allow_nonames[] = {
199 "allow.noset_hostname",
200 "allow.nosysvipc",
201 "allow.noraw_sockets",
202 "allow.nochflags",
203 "allow.nomount",
204 "allow.noquotas",
205 "allow.nosocket_af",
206};
207const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames);
208
209#define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME
210#define JAIL_DEFAULT_ENFORCE_STATFS 2
211static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
212static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
213#if defined(INET) || defined(INET6)
214static unsigned jail_max_af_ips = 255;
215#endif
216
217#ifdef INET
218static int
219qcmp_v4(const void *ip1, const void *ip2)
220{
221 in_addr_t iaa, iab;
222
223 /*
224 * We need to compare in HBO here to get the list sorted as expected
225 * by the result of the code. Sorting NBO addresses gives you
226 * interesting results. If you do not understand, do not try.
227 */
228 iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
229 iab = ntohl(((const struct in_addr *)ip2)->s_addr);
230
231 /*
232 * Do not simply return the difference of the two numbers, the int is
233 * not wide enough.
234 */
235 if (iaa > iab)
236 return (1);
237 else if (iaa < iab)
238 return (-1);
239 else
240 return (0);
241}
242#endif
243
244#ifdef INET6
245static int
246qcmp_v6(const void *ip1, const void *ip2)
247{
248 const struct in6_addr *ia6a, *ia6b;
249 int i, rc;
250
251 ia6a = (const struct in6_addr *)ip1;
252 ia6b = (const struct in6_addr *)ip2;
253
254 rc = 0;
255 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
256 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
257 rc = 1;
258 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
259 rc = -1;
260 }
261 return (rc);
262}
263#endif
264
265/*
266 * struct jail_args {
267 * struct jail *jail;
268 * };
269 */
270int
271jail(struct thread *td, struct jail_args *uap)
272{
273 uint32_t version;
274 int error;
275 struct jail j;
276
277 error = copyin(uap->jail, &version, sizeof(uint32_t));
278 if (error)
279 return (error);
280
281 switch (version) {
282 case 0:
283 {
284 struct jail_v0 j0;
285
286 /* FreeBSD single IPv4 jails. */
287 bzero(&j, sizeof(struct jail));
288 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
289 if (error)
290 return (error);
291 j.version = j0.version;
292 j.path = j0.path;
293 j.hostname = j0.hostname;
294 j.ip4s = j0.ip_number;
295 break;
296 }
297
298 case 1:
299 /*
300 * Version 1 was used by multi-IPv4 jail implementations
301 * that never made it into the official kernel.
302 */
303 return (EINVAL);
304
305 case 2: /* JAIL_API_VERSION */
306 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
307 error = copyin(uap->jail, &j, sizeof(struct jail));
308 if (error)
309 return (error);
310 break;
311
312 default:
313 /* Sci-Fi jails are not supported, sorry. */
314 return (EINVAL);
315 }
316 return (kern_jail(td, &j));
317}
318
319int
320kern_jail(struct thread *td, struct jail *j)
321{
322 struct iovec optiov[2 * (4
323 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0])
324#ifdef INET
325 + 1
326#endif
327#ifdef INET6
328 + 1
329#endif
330 )];
331 struct uio opt;
332 char *u_path, *u_hostname, *u_name;
333#ifdef INET
334 uint32_t ip4s;
335 struct in_addr *u_ip4;
336#endif
337#ifdef INET6
338 struct in6_addr *u_ip6;
339#endif
340 size_t tmplen;
341 int error, enforce_statfs, fi;
342
343 bzero(&optiov, sizeof(optiov));
344 opt.uio_iov = optiov;
345 opt.uio_iovcnt = 0;
346 opt.uio_offset = -1;
347 opt.uio_resid = -1;
348 opt.uio_segflg = UIO_SYSSPACE;
349 opt.uio_rw = UIO_READ;
350 opt.uio_td = td;
351
352 /* Set permissions for top-level jails from sysctls. */
353 if (!jailed(td->td_ucred)) {
354 for (fi = 0; fi < sizeof(pr_allow_names) /
355 sizeof(pr_allow_names[0]); fi++) {
356 optiov[opt.uio_iovcnt].iov_base =
357 (jail_default_allow & (1 << fi))
358 ? pr_allow_names[fi] : pr_allow_nonames[fi];
359 optiov[opt.uio_iovcnt].iov_len =
360 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
361 opt.uio_iovcnt += 2;
362 }
363 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
364 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
365 opt.uio_iovcnt++;
366 enforce_statfs = jail_default_enforce_statfs;
367 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
368 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
369 opt.uio_iovcnt++;
370 }
371
372 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
373#ifdef INET
374 ip4s = (j->version == 0) ? 1 : j->ip4s;
375 if (ip4s > jail_max_af_ips)
376 return (EINVAL);
377 tmplen += ip4s * sizeof(struct in_addr);
378#else
379 if (j->ip4s > 0)
380 return (EINVAL);
381#endif
382#ifdef INET6
383 if (j->ip6s > jail_max_af_ips)
384 return (EINVAL);
385 tmplen += j->ip6s * sizeof(struct in6_addr);
386#else
387 if (j->ip6s > 0)
388 return (EINVAL);
389#endif
390 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
391 u_hostname = u_path + MAXPATHLEN;
392 u_name = u_hostname + MAXHOSTNAMELEN;
393#ifdef INET
394 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
395#endif
396#ifdef INET6
397#ifdef INET
398 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
399#else
400 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
401#endif
402#endif
403 optiov[opt.uio_iovcnt].iov_base = "path";
404 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
405 opt.uio_iovcnt++;
406 optiov[opt.uio_iovcnt].iov_base = u_path;
407 error = copyinstr(j->path, u_path, MAXPATHLEN,
408 &optiov[opt.uio_iovcnt].iov_len);
409 if (error) {
410 free(u_path, M_TEMP);
411 return (error);
412 }
413 opt.uio_iovcnt++;
414 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
415 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
416 opt.uio_iovcnt++;
417 optiov[opt.uio_iovcnt].iov_base = u_hostname;
418 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
419 &optiov[opt.uio_iovcnt].iov_len);
420 if (error) {
421 free(u_path, M_TEMP);
422 return (error);
423 }
424 opt.uio_iovcnt++;
425 if (j->jailname != NULL) {
426 optiov[opt.uio_iovcnt].iov_base = "name";
427 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
428 opt.uio_iovcnt++;
429 optiov[opt.uio_iovcnt].iov_base = u_name;
430 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
431 &optiov[opt.uio_iovcnt].iov_len);
432 if (error) {
433 free(u_path, M_TEMP);
434 return (error);
435 }
436 opt.uio_iovcnt++;
437 }
438#ifdef INET
439 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
440 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
441 opt.uio_iovcnt++;
442 optiov[opt.uio_iovcnt].iov_base = u_ip4;
443 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
444 if (j->version == 0)
445 u_ip4->s_addr = j->ip4s;
446 else {
447 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
448 if (error) {
449 free(u_path, M_TEMP);
450 return (error);
451 }
452 }
453 opt.uio_iovcnt++;
454#endif
455#ifdef INET6
456 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
457 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
458 opt.uio_iovcnt++;
459 optiov[opt.uio_iovcnt].iov_base = u_ip6;
460 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
461 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
462 if (error) {
463 free(u_path, M_TEMP);
464 return (error);
465 }
466 opt.uio_iovcnt++;
467#endif
468 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]),
469 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
470 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
471 free(u_path, M_TEMP);
472 return (error);
473}
474
475
476/*
477 * struct jail_set_args {
478 * struct iovec *iovp;
479 * unsigned int iovcnt;
480 * int flags;
481 * };
482 */
483int
484jail_set(struct thread *td, struct jail_set_args *uap)
485{
486 struct uio *auio;
487 int error;
488
489 /* Check that we have an even number of iovecs. */
490 if (uap->iovcnt & 1)
491 return (EINVAL);
492
493 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
494 if (error)
495 return (error);
496 error = kern_jail_set(td, auio, uap->flags);
497 free(auio, M_IOV);
498 return (error);
499}
500
501int
502kern_jail_set(struct thread *td, struct uio *optuio, int flags)
503{
504 struct nameidata nd;
505#ifdef INET
506 struct in_addr *ip4;
507#endif
508#ifdef INET6
509 struct in6_addr *ip6;
510#endif
511 struct vfsopt *opt;
512 struct vfsoptlist *opts;
513 struct prison *pr, *deadpr, *mypr, *ppr, *tpr;
514 struct vnode *root;
515 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
516#if defined(INET) || defined(INET6)
517 struct prison *tppr;
518 void *op;
519#endif
520 unsigned long hid;
521 size_t namelen, onamelen;
522 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos;
523 int gotchildmax, gotenforce, gothid, gotslevel;
524 int fi, jid, jsys, len, level;
525 int childmax, slevel, vfslocked;
526#if defined(INET) || defined(INET6)
527 int ii, ij;
528#endif
529#ifdef INET
530 int ip4s, redo_ip4;
531#endif
532#ifdef INET6
533 int ip6s, redo_ip6;
534#endif
535 unsigned pr_flags, ch_flags;
536 unsigned pr_allow, ch_allow, tallow;
537 char numbuf[12];
538
539 error = priv_check(td, PRIV_JAIL_SET);
540 if (!error && (flags & JAIL_ATTACH))
541 error = priv_check(td, PRIV_JAIL_ATTACH);
542 if (error)
543 return (error);
544 mypr = ppr = td->td_ucred->cr_prison;
545 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
546 return (EPERM);
547 if (flags & ~JAIL_SET_MASK)
548 return (EINVAL);
549
550 /*
551 * Check all the parameters before committing to anything. Not all
552 * errors can be caught early, but we may as well try. Also, this
553 * takes care of some expensive stuff (path lookup) before getting
554 * the allprison lock.
555 *
556 * XXX Jails are not filesystems, and jail parameters are not mount
557 * options. But it makes more sense to re-use the vfsopt code
558 * than duplicate it under a different name.
559 */
560 error = vfs_buildopts(optuio, &opts);
561 if (error)
562 return (error);
563#ifdef INET
564 ip4 = NULL;
565#endif
566#ifdef INET6
567 ip6 = NULL;
568#endif
569
570 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
571 if (error == ENOENT)
572 jid = 0;
573 else if (error != 0)
574 goto done_free;
575
576 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
577 if (error == ENOENT)
578 gotslevel = 0;
579 else if (error != 0)
580 goto done_free;
581 else
582 gotslevel = 1;
583
584 error =
585 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
586 if (error == ENOENT)
587 gotchildmax = 0;
588 else if (error != 0)
589 goto done_free;
590 else
591 gotchildmax = 1;
592
593 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
594 if (error == ENOENT)
595 gotenforce = 0;
596 else if (error != 0)
597 goto done_free;
598 else if (enforce < 0 || enforce > 2) {
599 error = EINVAL;
600 goto done_free;
601 } else
602 gotenforce = 1;
603
604 pr_flags = ch_flags = 0;
605 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
606 fi++) {
607 if (pr_flag_names[fi] == NULL)
608 continue;
609 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi);
610 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi);
611 }
612 ch_flags |= pr_flags;
613 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
614 fi++) {
615 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys,
616 sizeof(jsys));
617 if (error == ENOENT)
618 continue;
619 if (error != 0)
620 goto done_free;
621 switch (jsys) {
622 case JAIL_SYS_DISABLE:
623 if (!pr_flag_jailsys[fi].disable) {
624 error = EINVAL;
625 goto done_free;
626 }
627 pr_flags |= pr_flag_jailsys[fi].disable;
628 break;
629 case JAIL_SYS_NEW:
630 pr_flags |= pr_flag_jailsys[fi].new;
631 break;
632 case JAIL_SYS_INHERIT:
633 break;
634 default:
635 error = EINVAL;
636 goto done_free;
637 }
638 ch_flags |=
639 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable;
640 }
641 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE
642 && !(pr_flags & PR_PERSIST)) {
643 error = EINVAL;
644 vfs_opterror(opts, "new jail must persist or attach");
645 goto done_errmsg;
646 }
647#ifdef VIMAGE
648 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
649 error = EINVAL;
650 vfs_opterror(opts, "vnet cannot be changed after creation");
651 goto done_errmsg;
652 }
653#endif
654#ifdef INET
655 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
656 error = EINVAL;
657 vfs_opterror(opts, "ip4 cannot be changed after creation");
658 goto done_errmsg;
659 }
660#endif
661#ifdef INET6
662 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
663 error = EINVAL;
664 vfs_opterror(opts, "ip6 cannot be changed after creation");
665 goto done_errmsg;
666 }
667#endif
668
669 pr_allow = ch_allow = 0;
670 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
671 fi++) {
672 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi);
673 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi);
674 }
675 ch_allow |= pr_allow;
676
677 error = vfs_getopt(opts, "name", (void **)&name, &len);
678 if (error == ENOENT)
679 name = NULL;
680 else if (error != 0)
681 goto done_free;
682 else {
683 if (len == 0 || name[len - 1] != '\0') {
684 error = EINVAL;
685 goto done_free;
686 }
687 if (len > MAXHOSTNAMELEN) {
688 error = ENAMETOOLONG;
689 goto done_free;
690 }
691 }
692
693 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
694 if (error == ENOENT)
695 host = NULL;
696 else if (error != 0)
697 goto done_free;
698 else {
699 ch_flags |= PR_HOST;
700 pr_flags |= PR_HOST;
701 if (len == 0 || host[len - 1] != '\0') {
702 error = EINVAL;
703 goto done_free;
704 }
705 if (len > MAXHOSTNAMELEN) {
706 error = ENAMETOOLONG;
707 goto done_free;
708 }
709 }
710
711 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
712 if (error == ENOENT)
713 domain = NULL;
714 else if (error != 0)
715 goto done_free;
716 else {
717 ch_flags |= PR_HOST;
718 pr_flags |= PR_HOST;
719 if (len == 0 || domain[len - 1] != '\0') {
720 error = EINVAL;
721 goto done_free;
722 }
723 if (len > MAXHOSTNAMELEN) {
724 error = ENAMETOOLONG;
725 goto done_free;
726 }
727 }
728
729 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
730 if (error == ENOENT)
731 uuid = NULL;
732 else if (error != 0)
733 goto done_free;
734 else {
735 ch_flags |= PR_HOST;
736 pr_flags |= PR_HOST;
737 if (len == 0 || uuid[len - 1] != '\0') {
738 error = EINVAL;
739 goto done_free;
740 }
741 if (len > HOSTUUIDLEN) {
742 error = ENAMETOOLONG;
743 goto done_free;
744 }
745 }
746
747#ifdef COMPAT_FREEBSD32
748 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
749 uint32_t hid32;
750
751 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
752 hid = hid32;
753 } else
754#endif
755 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
756 if (error == ENOENT)
757 gothid = 0;
758 else if (error != 0)
759 goto done_free;
760 else {
761 gothid = 1;
762 ch_flags |= PR_HOST;
763 pr_flags |= PR_HOST;
764 }
765
766#ifdef INET
767 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
768 if (error == ENOENT)
769 ip4s = (pr_flags & PR_IP4_DISABLE) ? 0 : -1;
770 else if (error != 0)
771 goto done_free;
772 else if (ip4s & (sizeof(*ip4) - 1)) {
773 error = EINVAL;
774 goto done_free;
775 } else {
776 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE;
777 if (ip4s == 0)
778 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE;
779 else {
780 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER;
781 ip4s /= sizeof(*ip4);
782 if (ip4s > jail_max_af_ips) {
783 error = EINVAL;
784 vfs_opterror(opts, "too many IPv4 addresses");
785 goto done_errmsg;
786 }
787 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
788 bcopy(op, ip4, ip4s * sizeof(*ip4));
789 /*
790 * IP addresses are all sorted but ip[0] to preserve
791 * the primary IP address as given from userland.
792 * This special IP is used for unbound outgoing
793 * connections as well for "loopback" traffic in case
794 * source address selection cannot find any more fitting
795 * address to connect from.
796 */
797 if (ip4s > 1)
798 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4);
799 /*
800 * Check for duplicate addresses and do some simple
801 * zero and broadcast checks. If users give other bogus
802 * addresses it is their problem.
803 *
804 * We do not have to care about byte order for these
805 * checks so we will do them in NBO.
806 */
807 for (ii = 0; ii < ip4s; ii++) {
808 if (ip4[ii].s_addr == INADDR_ANY ||
809 ip4[ii].s_addr == INADDR_BROADCAST) {
810 error = EINVAL;
811 goto done_free;
812 }
813 if ((ii+1) < ip4s &&
814 (ip4[0].s_addr == ip4[ii+1].s_addr ||
815 ip4[ii].s_addr == ip4[ii+1].s_addr)) {
816 error = EINVAL;
817 goto done_free;
818 }
819 }
820 }
821 }
822#endif
823
824#ifdef INET6
825 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
826 if (error == ENOENT)
827 ip6s = (pr_flags & PR_IP6_DISABLE) ? 0 : -1;
828 else if (error != 0)
829 goto done_free;
830 else if (ip6s & (sizeof(*ip6) - 1)) {
831 error = EINVAL;
832 goto done_free;
833 } else {
834 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE;
835 if (ip6s == 0)
836 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE;
837 else {
838 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER;
839 ip6s /= sizeof(*ip6);
840 if (ip6s > jail_max_af_ips) {
841 error = EINVAL;
842 vfs_opterror(opts, "too many IPv6 addresses");
843 goto done_errmsg;
844 }
845 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
846 bcopy(op, ip6, ip6s * sizeof(*ip6));
847 if (ip6s > 1)
848 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6);
849 for (ii = 0; ii < ip6s; ii++) {
850 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
851 error = EINVAL;
852 goto done_free;
853 }
854 if ((ii+1) < ip6s &&
855 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
856 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
857 {
858 error = EINVAL;
859 goto done_free;
860 }
861 }
862 }
863 }
864#endif
865
866#if defined(VIMAGE) && (defined(INET) || defined(INET6))
867 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
868 error = EINVAL;
869 vfs_opterror(opts,
870 "vnet jails cannot have IP address restrictions");
871 goto done_errmsg;
872 }
873#endif
874
875 root = NULL;
876 error = vfs_getopt(opts, "path", (void **)&path, &len);
877 if (error == ENOENT)
878 path = NULL;
879 else if (error != 0)
880 goto done_free;
881 else {
882 if (flags & JAIL_UPDATE) {
883 error = EINVAL;
884 vfs_opterror(opts,
885 "path cannot be changed after creation");
886 goto done_errmsg;
887 }
888 if (len == 0 || path[len - 1] != '\0') {
889 error = EINVAL;
890 goto done_free;
891 }
892 if (len < 2 || (len == 2 && path[0] == '/'))
893 path = NULL;
894 else {
895 /* Leave room for a real-root full pathname. */
896 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/")
897 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) {
898 error = ENAMETOOLONG;
899 goto done_free;
900 }
901 NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW, UIO_SYSSPACE,
902 path, td);
903 error = namei(&nd);
904 if (error)
905 goto done_free;
906 vfslocked = NDHASGIANT(&nd);
907 root = nd.ni_vp;
908 NDFREE(&nd, NDF_ONLY_PNBUF);
909 if (root->v_type != VDIR) {
910 error = ENOTDIR;
911 vrele(root);
912 VFS_UNLOCK_GIANT(vfslocked);
913 goto done_free;
914 }
915 VFS_UNLOCK_GIANT(vfslocked);
916 }
917 }
918
919 /*
920 * Grab the allprison lock before letting modules check their
921 * parameters. Once we have it, do not let go so we'll have a
922 * consistent view of the OSD list.
923 */
924 sx_xlock(&allprison_lock);
925 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts);
926 if (error)
927 goto done_unlock_list;
928
929 /* By now, all parameters should have been noted. */
930 TAILQ_FOREACH(opt, opts, link) {
931 if (!opt->seen && strcmp(opt->name, "errmsg")) {
932 error = EINVAL;
933 vfs_opterror(opts, "unknown parameter: %s", opt->name);
934 goto done_unlock_list;
935 }
936 }
937
938 /*
939 * See if we are creating a new record or updating an existing one.
940 * This abuses the file error codes ENOENT and EEXIST.
941 */
942 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
943 if (!cuflags) {
944 error = EINVAL;
945 vfs_opterror(opts, "no valid operation (create or update)");
946 goto done_unlock_list;
947 }
948 pr = NULL;
949 namelc = NULL;
950 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
951 namelc = strrchr(name, '.');
952 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
953 if (*p != '\0')
954 jid = 0;
955 }
956 if (jid != 0) {
957 /*
958 * See if a requested jid already exists. There is an
959 * information leak here if the jid exists but is not within
960 * the caller's jail hierarchy. Jail creators will get EEXIST
961 * even though they cannot see the jail, and CREATE | UPDATE
962 * will return ENOENT which is not normally a valid error.
963 */
964 if (jid < 0) {
965 error = EINVAL;
966 vfs_opterror(opts, "negative jid");
967 goto done_unlock_list;
968 }
969 pr = prison_find(jid);
970 if (pr != NULL) {
971 ppr = pr->pr_parent;
972 /* Create: jid must not exist. */
973 if (cuflags == JAIL_CREATE) {
974 mtx_unlock(&pr->pr_mtx);
975 error = EEXIST;
976 vfs_opterror(opts, "jail %d already exists",
977 jid);
978 goto done_unlock_list;
979 }
980 if (!prison_ischild(mypr, pr)) {
981 mtx_unlock(&pr->pr_mtx);
982 pr = NULL;
983 } else if (pr->pr_uref == 0) {
984 if (!(flags & JAIL_DYING)) {
985 mtx_unlock(&pr->pr_mtx);
986 error = ENOENT;
987 vfs_opterror(opts, "jail %d is dying",
988 jid);
989 goto done_unlock_list;
990 } else if ((flags & JAIL_ATTACH) ||
991 (pr_flags & PR_PERSIST)) {
992 /*
993 * A dying jail might be resurrected
994 * (via attach or persist), but first
995 * it must determine if another jail
996 * has claimed its name. Accomplish
997 * this by implicitly re-setting the
998 * name.
999 */
1000 if (name == NULL)
1001 name = prison_name(mypr, pr);
1002 }
1003 }
1004 }
1005 if (pr == NULL) {
1006 /* Update: jid must exist. */
1007 if (cuflags == JAIL_UPDATE) {
1008 error = ENOENT;
1009 vfs_opterror(opts, "jail %d not found", jid);
1010 goto done_unlock_list;
1011 }
1012 }
1013 }
1014 /*
1015 * If the caller provided a name, look for a jail by that name.
1016 * This has different semantics for creates and updates keyed by jid
1017 * (where the name must not already exist in a different jail),
1018 * and updates keyed by the name itself (where the name must exist
1019 * because that is the jail being updated).
1020 */
1021 if (name != NULL) {
1022 namelc = strrchr(name, '.');
1023 if (namelc == NULL)
1024 namelc = name;
1025 else {
1026 /*
1027 * This is a hierarchical name. Split it into the
1028 * parent and child names, and make sure the parent
1029 * exists or matches an already found jail.
1030 */
1031 *namelc = '\0';
1032 if (pr != NULL) {
1033 if (strncmp(name, ppr->pr_name, namelc - name)
1034 || ppr->pr_name[namelc - name] != '\0') {
1035 mtx_unlock(&pr->pr_mtx);
1036 error = EINVAL;
1037 vfs_opterror(opts,
1038 "cannot change jail's parent");
1039 goto done_unlock_list;
1040 }
1041 } else {
1042 ppr = prison_find_name(mypr, name);
1043 if (ppr == NULL) {
1044 error = ENOENT;
1045 vfs_opterror(opts,
1046 "jail \"%s\" not found", name);
1047 goto done_unlock_list;
1048 }
1049 mtx_unlock(&ppr->pr_mtx);
1050 }
1051 name = ++namelc;
1052 }
1053 if (name[0] != '\0') {
1054 namelen =
1055 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1056 name_again:
1057 deadpr = NULL;
1058 FOREACH_PRISON_CHILD(ppr, tpr) {
1059 if (tpr != pr && tpr->pr_ref > 0 &&
1060 !strcmp(tpr->pr_name + namelen, name)) {
1061 if (pr == NULL &&
1062 cuflags != JAIL_CREATE) {
1063 mtx_lock(&tpr->pr_mtx);
1064 if (tpr->pr_ref > 0) {
1065 /*
1066 * Use this jail
1067 * for updates.
1068 */
1069 if (tpr->pr_uref > 0) {
1070 pr = tpr;
1071 break;
1072 }
1073 deadpr = tpr;
1074 }
1075 mtx_unlock(&tpr->pr_mtx);
1076 } else if (tpr->pr_uref > 0) {
1077 /*
1078 * Create, or update(jid):
1079 * name must not exist in an
1080 * active sibling jail.
1081 */
1082 error = EEXIST;
1083 if (pr != NULL)
1084 mtx_unlock(&pr->pr_mtx);
1085 vfs_opterror(opts,
1086 "jail \"%s\" already exists",
1087 name);
1088 goto done_unlock_list;
1089 }
1090 }
1091 }
1092 /* If no active jail is found, use a dying one. */
1093 if (deadpr != NULL && pr == NULL) {
1094 if (flags & JAIL_DYING) {
1095 mtx_lock(&deadpr->pr_mtx);
1096 if (deadpr->pr_ref == 0) {
1097 mtx_unlock(&deadpr->pr_mtx);
1098 goto name_again;
1099 }
1100 pr = deadpr;
1101 } else if (cuflags == JAIL_UPDATE) {
1102 error = ENOENT;
1103 vfs_opterror(opts,
1104 "jail \"%s\" is dying", name);
1105 goto done_unlock_list;
1106 }
1107 }
1108 /* Update: name must exist if no jid. */
1109 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1110 error = ENOENT;
1111 vfs_opterror(opts, "jail \"%s\" not found",
1112 name);
1113 goto done_unlock_list;
1114 }
1115 }
1116 }
1117 /* Update: must provide a jid or name. */
1118 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1119 error = ENOENT;
1120 vfs_opterror(opts, "update specified no jail");
1121 goto done_unlock_list;
1122 }
1123
1124 /* If there's no prison to update, create a new one and link it in. */
1125 if (pr == NULL) {
1126 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1127 if (tpr->pr_childcount >= tpr->pr_childmax) {
1128 error = EPERM;
1129 vfs_opterror(opts, "prison limit exceeded");
1130 goto done_unlock_list;
1131 }
1132 created = 1;
1133 mtx_lock(&ppr->pr_mtx);
1134 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) {
1135 mtx_unlock(&ppr->pr_mtx);
1136 error = ENOENT;
1137 vfs_opterror(opts, "parent jail went away!");
1138 goto done_unlock_list;
1139 }
1140 ppr->pr_ref++;
1141 ppr->pr_uref++;
1142 mtx_unlock(&ppr->pr_mtx);
1143 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1144 if (jid == 0) {
1145 /* Find the next free jid. */
1146 jid = lastprid + 1;
1147 findnext:
1148 if (jid == JAIL_MAX)
1149 jid = 1;
1150 TAILQ_FOREACH(tpr, &allprison, pr_list) {
1151 if (tpr->pr_id < jid)
1152 continue;
1153 if (tpr->pr_id > jid || tpr->pr_ref == 0) {
1154 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1155 break;
1156 }
1157 if (jid == lastprid) {
1158 error = EAGAIN;
1159 vfs_opterror(opts,
1160 "no available jail IDs");
1161 free(pr, M_PRISON);
1162 prison_deref(ppr, PD_DEREF |
1163 PD_DEUREF | PD_LIST_XLOCKED);
1164 goto done_releroot;
1165 }
1166 jid++;
1167 goto findnext;
1168 }
1169 lastprid = jid;
1170 } else {
1171 /*
1172 * The jail already has a jid (that did not yet exist),
1173 * so just find where to insert it.
1174 */
1175 TAILQ_FOREACH(tpr, &allprison, pr_list)
1176 if (tpr->pr_id >= jid) {
1177 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1178 break;
1179 }
1180 }
1181 if (tpr == NULL)
1182 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1183 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1184 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1185 tpr->pr_childcount++;
1186
1187 pr->pr_parent = ppr;
1188 pr->pr_id = jid;
1189
1190 /* Set some default values, and inherit some from the parent. */
1191 if (name == NULL)
1192 name = "";
1193 if (path == NULL) {
1194 path = "/";
1195 root = mypr->pr_root;
1196 vref(root);
1197 }
1198 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1199 pr->pr_flags |= PR_HOST;
1200#if defined(INET) || defined(INET6)
1201#ifdef VIMAGE
1202 if (!(pr_flags & PR_VNET))
1203#endif
1204 {
1205#ifdef INET
1206 if (!(ch_flags & PR_IP4_USER))
1207 pr->pr_flags |=
1208 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE;
1209 else if (!(pr_flags & PR_IP4_USER)) {
1210 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1211 if (ppr->pr_ip4 != NULL) {
1212 pr->pr_ip4s = ppr->pr_ip4s;
1213 pr->pr_ip4 = malloc(pr->pr_ip4s *
1214 sizeof(struct in_addr), M_PRISON,
1215 M_WAITOK);
1216 bcopy(ppr->pr_ip4, pr->pr_ip4,
1217 pr->pr_ip4s * sizeof(*pr->pr_ip4));
1218 }
1219 }
1220#endif
1221#ifdef INET6
1222 if (!(ch_flags & PR_IP6_USER))
1223 pr->pr_flags |=
1224 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE;
1225 else if (!(pr_flags & PR_IP6_USER)) {
1226 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1227 if (ppr->pr_ip6 != NULL) {
1228 pr->pr_ip6s = ppr->pr_ip6s;
1229 pr->pr_ip6 = malloc(pr->pr_ip6s *
1230 sizeof(struct in6_addr), M_PRISON,
1231 M_WAITOK);
1232 bcopy(ppr->pr_ip6, pr->pr_ip6,
1233 pr->pr_ip6s * sizeof(*pr->pr_ip6));
1234 }
1235 }
1236#endif
1237 }
1238#endif
1239 /* Source address selection is always on by default. */
1240 pr->pr_flags |= _PR_IP_SADDRSEL;
1241
1242 pr->pr_securelevel = ppr->pr_securelevel;
1243 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1244 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
1245
1246 LIST_INIT(&pr->pr_children);
1247 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1248
1249#ifdef VIMAGE
1250 /* Allocate a new vnet if specified. */
1251 pr->pr_vnet = (pr_flags & PR_VNET)
1252 ? vnet_alloc() : ppr->pr_vnet;
1253#endif
1254 /*
1255 * Allocate a dedicated cpuset for each jail.
1256 * Unlike other initial settings, this may return an erorr.
1257 */
1258 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1259 if (error) {
1260 prison_deref(pr, PD_LIST_XLOCKED);
1261 goto done_releroot;
1262 }
1263
1264 mtx_lock(&pr->pr_mtx);
1265 /*
1266 * New prisons do not yet have a reference, because we do not
1267 * want other to see the incomplete prison once the
1268 * allprison_lock is downgraded.
1269 */
1270 } else {
1271 created = 0;
1272 /*
1273 * Grab a reference for existing prisons, to ensure they
1274 * continue to exist for the duration of the call.
1275 */
1276 pr->pr_ref++;
1277#if defined(VIMAGE) && (defined(INET) || defined(INET6))
1278 if ((pr->pr_flags & PR_VNET) &&
1279 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1280 error = EINVAL;
1281 vfs_opterror(opts,
1282 "vnet jails cannot have IP address restrictions");
1283 goto done_deref_locked;
1284 }
1285#endif
1286#ifdef INET
1287 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1288 error = EINVAL;
1289 vfs_opterror(opts,
1290 "ip4 cannot be changed after creation");
1291 goto done_deref_locked;
1292 }
1293#endif
1294#ifdef INET6
1295 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1296 error = EINVAL;
1297 vfs_opterror(opts,
1298 "ip6 cannot be changed after creation");
1299 goto done_deref_locked;
1300 }
1301#endif
1302 }
1303
1304 /* Do final error checking before setting anything. */
1305 if (gotslevel) {
1306 if (slevel < ppr->pr_securelevel) {
1307 error = EPERM;
1308 goto done_deref_locked;
1309 }
1310 }
1311 if (gotchildmax) {
1312 if (childmax >= ppr->pr_childmax) {
1313 error = EPERM;
1314 goto done_deref_locked;
1315 }
1316 }
1317 if (gotenforce) {
1318 if (enforce < ppr->pr_enforce_statfs) {
1319 error = EPERM;
1320 goto done_deref_locked;
1321 }
1322 }
1323#ifdef INET
1324 if (ip4s > 0) {
1325 if (ppr->pr_flags & PR_IP4) {
1326 /*
1327 * Make sure the new set of IP addresses is a
1328 * subset of the parent's list. Don't worry
1329 * about the parent being unlocked, as any
1330 * setting is done with allprison_lock held.
1331 */
1332 for (ij = 0; ij < ppr->pr_ip4s; ij++)
1333 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
1334 break;
1335 if (ij == ppr->pr_ip4s) {
1336 error = EPERM;
1337 goto done_deref_locked;
1338 }
1339 if (ip4s > 1) {
1340 for (ii = ij = 1; ii < ip4s; ii++) {
1341 if (ip4[ii].s_addr ==
1342 ppr->pr_ip4[0].s_addr)
1343 continue;
1344 for (; ij < ppr->pr_ip4s; ij++)
1345 if (ip4[ii].s_addr ==
1346 ppr->pr_ip4[ij].s_addr)
1347 break;
1348 if (ij == ppr->pr_ip4s)
1349 break;
1350 }
1351 if (ij == ppr->pr_ip4s) {
1352 error = EPERM;
1353 goto done_deref_locked;
1354 }
1355 }
1356 }
1357 /*
1358 * Check for conflicting IP addresses. We permit them
1359 * if there is no more than one IP on each jail. If
1360 * there is a duplicate on a jail with more than one
1361 * IP stop checking and return error.
1362 */
1363 tppr = ppr;
1364#ifdef VIMAGE
1365 for (; tppr != &prison0; tppr = tppr->pr_parent)
1366 if (tppr->pr_flags & PR_VNET)
1367 break;
1368#endif
1369 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1370 if (tpr == pr ||
1371#ifdef VIMAGE
1372 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1373#endif
1374 tpr->pr_uref == 0) {
1375 descend = 0;
1376 continue;
1377 }
1378 if (!(tpr->pr_flags & PR_IP4_USER))
1379 continue;
1380 descend = 0;
1381 if (tpr->pr_ip4 == NULL ||
1382 (ip4s == 1 && tpr->pr_ip4s == 1))
1383 continue;
1384 for (ii = 0; ii < ip4s; ii++) {
1385 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) {
1386 error = EADDRINUSE;
1387 vfs_opterror(opts,
1388 "IPv4 addresses clash");
1389 goto done_deref_locked;
1390 }
1391 }
1392 }
1393 }
1394#endif
1395#ifdef INET6
1396 if (ip6s > 0) {
1397 if (ppr->pr_flags & PR_IP6) {
1398 /*
1399 * Make sure the new set of IP addresses is a
1400 * subset of the parent's list.
1401 */
1402 for (ij = 0; ij < ppr->pr_ip6s; ij++)
1403 if (IN6_ARE_ADDR_EQUAL(&ip6[0],
1404 &ppr->pr_ip6[ij]))
1405 break;
1406 if (ij == ppr->pr_ip6s) {
1407 error = EPERM;
1408 goto done_deref_locked;
1409 }
1410 if (ip6s > 1) {
1411 for (ii = ij = 1; ii < ip6s; ii++) {
1412 if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
1413 &ppr->pr_ip6[0]))
1414 continue;
1415 for (; ij < ppr->pr_ip6s; ij++)
1416 if (IN6_ARE_ADDR_EQUAL(
1417 &ip6[ii], &ppr->pr_ip6[ij]))
1418 break;
1419 if (ij == ppr->pr_ip6s)
1420 break;
1421 }
1422 if (ij == ppr->pr_ip6s) {
1423 error = EPERM;
1424 goto done_deref_locked;
1425 }
1426 }
1427 }
1428 /* Check for conflicting IP addresses. */
1429 tppr = ppr;
1430#ifdef VIMAGE
1431 for (; tppr != &prison0; tppr = tppr->pr_parent)
1432 if (tppr->pr_flags & PR_VNET)
1433 break;
1434#endif
1435 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1436 if (tpr == pr ||
1437#ifdef VIMAGE
1438 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1439#endif
1440 tpr->pr_uref == 0) {
1441 descend = 0;
1442 continue;
1443 }
1444 if (!(tpr->pr_flags & PR_IP6_USER))
1445 continue;
1446 descend = 0;
1447 if (tpr->pr_ip6 == NULL ||
1448 (ip6s == 1 && tpr->pr_ip6s == 1))
1449 continue;
1450 for (ii = 0; ii < ip6s; ii++) {
1451 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) {
1452 error = EADDRINUSE;
1453 vfs_opterror(opts,
1454 "IPv6 addresses clash");
1455 goto done_deref_locked;
1456 }
1457 }
1458 }
1459 }
1460#endif
1461 onamelen = namelen = 0;
1462 if (name != NULL) {
1463 /* Give a default name of the jid. */
1464 if (name[0] == '\0')
1465 snprintf(name = numbuf, sizeof(numbuf), "%d", jid);
1466 else if (*namelc == '0' || (strtoul(namelc, &p, 10) != jid &&
1467 *p == '\0')) {
1468 error = EINVAL;
1469 vfs_opterror(opts,
1470 "name cannot be numeric (unless it is the jid)");
1471 goto done_deref_locked;
1472 }
1473 /*
1474 * Make sure the name isn't too long for the prison or its
1475 * children.
1476 */
1477 onamelen = strlen(pr->pr_name);
1478 namelen = strlen(name);
1479 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) {
1480 error = ENAMETOOLONG;
1481 goto done_deref_locked;
1482 }
1483 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1484 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
1485 sizeof(pr->pr_name)) {
1486 error = ENAMETOOLONG;
1487 goto done_deref_locked;
1488 }
1489 }
1490 }
1491 if (pr_allow & ~ppr->pr_allow) {
1492 error = EPERM;
1493 goto done_deref_locked;
1494 }
1495
1496 /* Set the parameters of the prison. */
1497#ifdef INET
1498 redo_ip4 = 0;
1499 if (pr_flags & PR_IP4_USER) {
1500 pr->pr_flags |= PR_IP4;
1501 free(pr->pr_ip4, M_PRISON);
1502 pr->pr_ip4s = ip4s;
1503 pr->pr_ip4 = ip4;
1504 ip4 = NULL;
1505 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1506#ifdef VIMAGE
1507 if (tpr->pr_flags & PR_VNET) {
1508 descend = 0;
1509 continue;
1510 }
1511#endif
1512 if (prison_restrict_ip4(tpr, NULL)) {
1513 redo_ip4 = 1;
1514 descend = 0;
1515 }
1516 }
1517 }
1518#endif
1519#ifdef INET6
1520 redo_ip6 = 0;
1521 if (pr_flags & PR_IP6_USER) {
1522 pr->pr_flags |= PR_IP6;
1523 free(pr->pr_ip6, M_PRISON);
1524 pr->pr_ip6s = ip6s;
1525 pr->pr_ip6 = ip6;
1526 ip6 = NULL;
1527 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1528#ifdef VIMAGE
1529 if (tpr->pr_flags & PR_VNET) {
1530 descend = 0;
1531 continue;
1532 }
1533#endif
1534 if (prison_restrict_ip6(tpr, NULL)) {
1535 redo_ip6 = 1;
1536 descend = 0;
1537 }
1538 }
1539 }
1540#endif
1541 if (gotslevel) {
1542 pr->pr_securelevel = slevel;
1543 /* Set all child jails to be at least this level. */
1544 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1545 if (tpr->pr_securelevel < slevel)
1546 tpr->pr_securelevel = slevel;
1547 }
1548 if (gotchildmax) {
1549 pr->pr_childmax = childmax;
1550 /* Set all child jails to under this limit. */
1551 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
1552 if (tpr->pr_childmax > childmax - level)
1553 tpr->pr_childmax = childmax > level
1554 ? childmax - level : 0;
1555 }
1556 if (gotenforce) {
1557 pr->pr_enforce_statfs = enforce;
1558 /* Pass this restriction on to the children. */
1559 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1560 if (tpr->pr_enforce_statfs < enforce)
1561 tpr->pr_enforce_statfs = enforce;
1562 }
1563 if (name != NULL) {
1564 if (ppr == &prison0)
1565 strlcpy(pr->pr_name, name, sizeof(pr->pr_name));
1566 else
1567 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
1568 ppr->pr_name, name);
1569 /* Change this component of child names. */
1570 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1571 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
1572 strlen(tpr->pr_name + onamelen) + 1);
1573 bcopy(pr->pr_name, tpr->pr_name, namelen);
1574 }
1575 }
1576 if (path != NULL) {
1577 /* Try to keep a real-rooted full pathname. */
1578 if (path[0] == '/' && strcmp(mypr->pr_path, "/"))
1579 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s",
1580 mypr->pr_path, path);
1581 else
1582 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
1583 pr->pr_root = root;
1584 }
1585 if (PR_HOST & ch_flags & ~pr_flags) {
1586 if (pr->pr_flags & PR_HOST) {
1587 /*
1588 * Copy the parent's host info. As with pr_ip4 above,
1589 * the lack of a lock on the parent is not a problem;
1590 * it is always set with allprison_lock at least
1591 * shared, and is held exclusively here.
1592 */
1593 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
1594 sizeof(pr->pr_hostname));
1595 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
1596 sizeof(pr->pr_domainname));
1597 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
1598 sizeof(pr->pr_hostuuid));
1599 pr->pr_hostid = pr->pr_parent->pr_hostid;
1600 }
1601 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
1602 /* Set this prison, and any descendants without PR_HOST. */
1603 if (host != NULL)
1604 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
1605 if (domain != NULL)
1606 strlcpy(pr->pr_domainname, domain,
1607 sizeof(pr->pr_domainname));
1608 if (uuid != NULL)
1609 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
1610 if (gothid)
1611 pr->pr_hostid = hid;
1612 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1613 if (tpr->pr_flags & PR_HOST)
1614 descend = 0;
1615 else {
1616 if (host != NULL)
1617 strlcpy(tpr->pr_hostname,
1618 pr->pr_hostname,
1619 sizeof(tpr->pr_hostname));
1620 if (domain != NULL)
1621 strlcpy(tpr->pr_domainname,
1622 pr->pr_domainname,
1623 sizeof(tpr->pr_domainname));
1624 if (uuid != NULL)
1625 strlcpy(tpr->pr_hostuuid,
1626 pr->pr_hostuuid,
1627 sizeof(tpr->pr_hostuuid));
1628 if (gothid)
1629 tpr->pr_hostid = hid;
1630 }
1631 }
1632 }
1633 if ((tallow = ch_allow & ~pr_allow)) {
1634 /* Clear allow bits in all children. */
1635 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1636 tpr->pr_allow &= ~tallow;
1637 }
1638 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
1639 /*
1640 * Persistent prisons get an extra reference, and prisons losing their
1641 * persist flag lose that reference. Only do this for existing prisons
1642 * for now, so new ones will remain unseen until after the module
1643 * handlers have completed.
1644 */
1645 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) {
1646 if (pr_flags & PR_PERSIST) {
1647 pr->pr_ref++;
1648 pr->pr_uref++;
1649 } else {
1650 pr->pr_ref--;
1651 pr->pr_uref--;
1652 }
1653 }
1654 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
1655 mtx_unlock(&pr->pr_mtx);
1656
1657 /* Locks may have prevented a complete restriction of child IP
1658 * addresses. If so, allocate some more memory and try again.
1659 */
1660#ifdef INET
1661 while (redo_ip4) {
1662 ip4s = pr->pr_ip4s;
1663 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
1664 mtx_lock(&pr->pr_mtx);
1665 redo_ip4 = 0;
1666 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1667#ifdef VIMAGE
1668 if (tpr->pr_flags & PR_VNET) {
1669 descend = 0;
1670 continue;
1671 }
1672#endif
1673 if (prison_restrict_ip4(tpr, ip4)) {
1674 if (ip4 != NULL)
1675 ip4 = NULL;
1676 else
1677 redo_ip4 = 1;
1678 }
1679 }
1680 mtx_unlock(&pr->pr_mtx);
1681 }
1682#endif
1683#ifdef INET6
1684 while (redo_ip6) {
1685 ip6s = pr->pr_ip6s;
1686 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
1687 mtx_lock(&pr->pr_mtx);
1688 redo_ip6 = 0;
1689 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1690#ifdef VIMAGE
1691 if (tpr->pr_flags & PR_VNET) {
1692 descend = 0;
1693 continue;
1694 }
1695#endif
1696 if (prison_restrict_ip6(tpr, ip6)) {
1697 if (ip6 != NULL)
1698 ip6 = NULL;
1699 else
1700 redo_ip6 = 1;
1701 }
1702 }
1703 mtx_unlock(&pr->pr_mtx);
1704 }
1705#endif
1706
1707 /* Let the modules do their work. */
1708 sx_downgrade(&allprison_lock);
1709 if (created) {
1710 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
1711 if (error) {
1712 prison_deref(pr, PD_LIST_SLOCKED);
1713 goto done_errmsg;
1714 }
1715 }
1716 error = osd_jail_call(pr, PR_METHOD_SET, opts);
1717 if (error) {
1718 prison_deref(pr, created
1719 ? PD_LIST_SLOCKED
1720 : PD_DEREF | PD_LIST_SLOCKED);
1721 goto done_errmsg;
1722 }
1723
1724 /* Attach this process to the prison if requested. */
1725 if (flags & JAIL_ATTACH) {
1726 mtx_lock(&pr->pr_mtx);
1727 error = do_jail_attach(td, pr);
1728 if (error) {
1729 vfs_opterror(opts, "attach failed");
1730 if (!created)
1731 prison_deref(pr, PD_DEREF);
1732 goto done_errmsg;
1733 }
1734 }
1735
1736 /*
1737 * Now that it is all there, drop the temporary reference from existing
1738 * prisons. Or add a reference to newly created persistent prisons
1739 * (which was not done earlier so that the prison would not be publicly
1740 * visible).
1741 */
1742 if (!created) {
1743 prison_deref(pr, (flags & JAIL_ATTACH)
1744 ? PD_DEREF
1745 : PD_DEREF | PD_LIST_SLOCKED);
1746 } else {
1747 if (pr_flags & PR_PERSIST) {
1748 mtx_lock(&pr->pr_mtx);
1749 pr->pr_ref++;
1750 pr->pr_uref++;
1751 mtx_unlock(&pr->pr_mtx);
1752 }
1753 if (!(flags & JAIL_ATTACH))
1754 sx_sunlock(&allprison_lock);
1755 }
1756 td->td_retval[0] = pr->pr_id;
1757 goto done_errmsg;
1758
1759 done_deref_locked:
1760 prison_deref(pr, created
1761 ? PD_LOCKED | PD_LIST_XLOCKED
1762 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
1763 goto done_releroot;
1764 done_unlock_list:
1765 sx_xunlock(&allprison_lock);
1766 done_releroot:
1767 if (root != NULL) {
1768 vfslocked = VFS_LOCK_GIANT(root->v_mount);
1769 vrele(root);
1770 VFS_UNLOCK_GIANT(vfslocked);
1771 }
1772 done_errmsg:
1773 if (error) {
1774 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
1775 if (errmsg_len > 0) {
1776 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
1777 if (errmsg_pos > 0) {
1778 if (optuio->uio_segflg == UIO_SYSSPACE)
1779 bcopy(errmsg,
1780 optuio->uio_iov[errmsg_pos].iov_base,
1781 errmsg_len);
1782 else
1783 copyout(errmsg,
1784 optuio->uio_iov[errmsg_pos].iov_base,
1785 errmsg_len);
1786 }
1787 }
1788 }
1789 done_free:
1790#ifdef INET
1791 free(ip4, M_PRISON);
1792#endif
1793#ifdef INET6
1794 free(ip6, M_PRISON);
1795#endif
1796 vfs_freeopts(opts);
1797 return (error);
1798}
1799
1800
1801/*
1802 * struct jail_get_args {
1803 * struct iovec *iovp;
1804 * unsigned int iovcnt;
1805 * int flags;
1806 * };
1807 */
1808int
1809jail_get(struct thread *td, struct jail_get_args *uap)
1810{
1811 struct uio *auio;
1812 int error;
1813
1814 /* Check that we have an even number of iovecs. */
1815 if (uap->iovcnt & 1)
1816 return (EINVAL);
1817
1818 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
1819 if (error)
1820 return (error);
1821 error = kern_jail_get(td, auio, uap->flags);
1822 if (error == 0)
1823 error = copyout(auio->uio_iov, uap->iovp,
1824 uap->iovcnt * sizeof (struct iovec));
1825 free(auio, M_IOV);
1826 return (error);
1827}
1828
1829int
1830kern_jail_get(struct thread *td, struct uio *optuio, int flags)
1831{
1832 struct prison *pr, *mypr;
1833 struct vfsopt *opt;
1834 struct vfsoptlist *opts;
1835 char *errmsg, *name;
1836 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos;
1837
1838 if (flags & ~JAIL_GET_MASK)
1839 return (EINVAL);
1840
1841 /* Get the parameter list. */
1842 error = vfs_buildopts(optuio, &opts);
1843 if (error)
1844 return (error);
1845 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
1846 mypr = td->td_ucred->cr_prison;
1847
1848 /*
1849 * Find the prison specified by one of: lastjid, jid, name.
1850 */
1851 sx_slock(&allprison_lock);
1852 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
1853 if (error == 0) {
1854 TAILQ_FOREACH(pr, &allprison, pr_list) {
1855 if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
1856 mtx_lock(&pr->pr_mtx);
1857 if (pr->pr_ref > 0 &&
1858 (pr->pr_uref > 0 || (flags & JAIL_DYING)))
1859 break;
1860 mtx_unlock(&pr->pr_mtx);
1861 }
1862 }
1863 if (pr != NULL)
1864 goto found_prison;
1865 error = ENOENT;
1866 vfs_opterror(opts, "no jail after %d", jid);
1867 goto done_unlock_list;
1868 } else if (error != ENOENT)
1869 goto done_unlock_list;
1870
1871 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
1872 if (error == 0) {
1873 if (jid != 0) {
1874 pr = prison_find_child(mypr, jid);
1875 if (pr != NULL) {
1876 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1877 mtx_unlock(&pr->pr_mtx);
1878 error = ENOENT;
1879 vfs_opterror(opts, "jail %d is dying",
1880 jid);
1881 goto done_unlock_list;
1882 }
1883 goto found_prison;
1884 }
1885 error = ENOENT;
1886 vfs_opterror(opts, "jail %d not found", jid);
1887 goto done_unlock_list;
1888 }
1889 } else if (error != ENOENT)
1890 goto done_unlock_list;
1891
1892 error = vfs_getopt(opts, "name", (void **)&name, &len);
1893 if (error == 0) {
1894 if (len == 0 || name[len - 1] != '\0') {
1895 error = EINVAL;
1896 goto done_unlock_list;
1897 }
1898 pr = prison_find_name(mypr, name);
1899 if (pr != NULL) {
1900 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1901 mtx_unlock(&pr->pr_mtx);
1902 error = ENOENT;
1903 vfs_opterror(opts, "jail \"%s\" is dying",
1904 name);
1905 goto done_unlock_list;
1906 }
1907 goto found_prison;
1908 }
1909 error = ENOENT;
1910 vfs_opterror(opts, "jail \"%s\" not found", name);
1911 goto done_unlock_list;
1912 } else if (error != ENOENT)
1913 goto done_unlock_list;
1914
1915 vfs_opterror(opts, "no jail specified");
1916 error = ENOENT;
1917 goto done_unlock_list;
1918
1919 found_prison:
1920 /* Get the parameters of the prison. */
1921 pr->pr_ref++;
1922 locked = PD_LOCKED;
1923 td->td_retval[0] = pr->pr_id;
1924 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
1925 if (error != 0 && error != ENOENT)
1926 goto done_deref;
1927 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
1928 error = vfs_setopt(opts, "parent", &i, sizeof(i));
1929 if (error != 0 && error != ENOENT)
1930 goto done_deref;
1931 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
1932 if (error != 0 && error != ENOENT)
1933 goto done_deref;
1934 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
1935 sizeof(pr->pr_cpuset->cs_id));
1936 if (error != 0 && error != ENOENT)
1937 goto done_deref;
1938 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
1939 if (error != 0 && error != ENOENT)
1940 goto done_deref;
1941#ifdef INET
1942 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
1943 pr->pr_ip4s * sizeof(*pr->pr_ip4));
1944 if (error != 0 && error != ENOENT)
1945 goto done_deref;
1946#endif
1947#ifdef INET6
1948 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
1949 pr->pr_ip6s * sizeof(*pr->pr_ip6));
1950 if (error != 0 && error != ENOENT)
1951 goto done_deref;
1952#endif
1953 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
1954 sizeof(pr->pr_securelevel));
1955 if (error != 0 && error != ENOENT)
1956 goto done_deref;
1957 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
1958 sizeof(pr->pr_childcount));
1959 if (error != 0 && error != ENOENT)
1960 goto done_deref;
1961 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
1962 sizeof(pr->pr_childmax));
1963 if (error != 0 && error != ENOENT)
1964 goto done_deref;
1965 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
1966 if (error != 0 && error != ENOENT)
1967 goto done_deref;
1968 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
1969 if (error != 0 && error != ENOENT)
1970 goto done_deref;
1971 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
1972 if (error != 0 && error != ENOENT)
1973 goto done_deref;
1974#ifdef COMPAT_FREEBSD32
1975 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
1976 uint32_t hid32 = pr->pr_hostid;
1977
1978 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
1979 } else
1980#endif
1981 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
1982 sizeof(pr->pr_hostid));
1983 if (error != 0 && error != ENOENT)
1984 goto done_deref;
1985 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
1986 sizeof(pr->pr_enforce_statfs));
1987 if (error != 0 && error != ENOENT)
1988 goto done_deref;
1989 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
1990 fi++) {
1991 if (pr_flag_names[fi] == NULL)
1992 continue;
1993 i = (pr->pr_flags & (1 << fi)) ? 1 : 0;
1994 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i));
1995 if (error != 0 && error != ENOENT)
1996 goto done_deref;
1997 i = !i;
1998 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i));
1999 if (error != 0 && error != ENOENT)
2000 goto done_deref;
2001 }
2002 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
2003 fi++) {
2004 i = pr->pr_flags &
2005 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
2006 i = pr_flag_jailsys[fi].disable &&
2007 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE
2008 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW
2009 : JAIL_SYS_INHERIT;
2010 error =
2011 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i));
2012 if (error != 0 && error != ENOENT)
2013 goto done_deref;
2014 }
2015 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
2016 fi++) {
2017 if (pr_allow_names[fi] == NULL)
2018 continue;
2019 i = (pr->pr_allow & (1 << fi)) ? 1 : 0;
2020 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i));
2021 if (error != 0 && error != ENOENT)
2022 goto done_deref;
2023 i = !i;
2024 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i));
2025 if (error != 0 && error != ENOENT)
2026 goto done_deref;
2027 }
2028 i = (pr->pr_uref == 0);
2029 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2030 if (error != 0 && error != ENOENT)
2031 goto done_deref;
2032 i = !i;
2033 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2034 if (error != 0 && error != ENOENT)
2035 goto done_deref;
2036
2037 /* Get the module parameters. */
2038 mtx_unlock(&pr->pr_mtx);
2039 locked = 0;
2040 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2041 if (error)
2042 goto done_deref;
2043 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
2044
2045 /* By now, all parameters should have been noted. */
2046 TAILQ_FOREACH(opt, opts, link) {
2047 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2048 error = EINVAL;
2049 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2050 goto done_errmsg;
2051 }
2052 }
2053
2054 /* Write the fetched parameters back to userspace. */
2055 error = 0;
2056 TAILQ_FOREACH(opt, opts, link) {
2057 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2058 pos = 2 * opt->pos + 1;
2059 optuio->uio_iov[pos].iov_len = opt->len;
2060 if (opt->value != NULL) {
2061 if (optuio->uio_segflg == UIO_SYSSPACE) {
2062 bcopy(opt->value,
2063 optuio->uio_iov[pos].iov_base,
2064 opt->len);
2065 } else {
2066 error = copyout(opt->value,
2067 optuio->uio_iov[pos].iov_base,
2068 opt->len);
2069 if (error)
2070 break;
2071 }
2072 }
2073 }
2074 }
2075 goto done_errmsg;
2076
2077 done_deref:
2078 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
2079 goto done_errmsg;
2080
2081 done_unlock_list:
2082 sx_sunlock(&allprison_lock);
2083 done_errmsg:
2084 if (error && errmsg_pos >= 0) {
2085 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2086 errmsg_pos = 2 * errmsg_pos + 1;
2087 if (errmsg_len > 0) {
2088 if (optuio->uio_segflg == UIO_SYSSPACE)
2089 bcopy(errmsg,
2090 optuio->uio_iov[errmsg_pos].iov_base,
2091 errmsg_len);
2092 else
2093 copyout(errmsg,
2094 optuio->uio_iov[errmsg_pos].iov_base,
2095 errmsg_len);
2096 }
2097 }
2098 vfs_freeopts(opts);
2099 return (error);
2100}
2101
2102
2103/*
2104 * struct jail_remove_args {
2105 * int jid;
2106 * };
2107 */
2108int
2109jail_remove(struct thread *td, struct jail_remove_args *uap)
2110{
2111 struct prison *pr, *cpr, *lpr, *tpr;
2112 int descend, error;
2113
2114 error = priv_check(td, PRIV_JAIL_REMOVE);
2115 if (error)
2116 return (error);
2117
2118 sx_xlock(&allprison_lock);
2119 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2120 if (pr == NULL) {
2121 sx_xunlock(&allprison_lock);
2122 return (EINVAL);
2123 }
2124
2125 /* Remove all descendants of this prison, then remove this prison. */
2126 pr->pr_ref++;
2127 pr->pr_flags |= PR_REMOVE;
2128 if (!LIST_EMPTY(&pr->pr_children)) {
2129 mtx_unlock(&pr->pr_mtx);
2130 lpr = NULL;
2131 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
2132 mtx_lock(&cpr->pr_mtx);
2133 if (cpr->pr_ref > 0) {
2134 tpr = cpr;
2135 cpr->pr_ref++;
2136 cpr->pr_flags |= PR_REMOVE;
2137 } else {
2138 /* Already removed - do not do it again. */
2139 tpr = NULL;
2140 }
2141 mtx_unlock(&cpr->pr_mtx);
2142 if (lpr != NULL) {
2143 mtx_lock(&lpr->pr_mtx);
2144 prison_remove_one(lpr);
2145 sx_xlock(&allprison_lock);
2146 }
2147 lpr = tpr;
2148 }
2149 if (lpr != NULL) {
2150 mtx_lock(&lpr->pr_mtx);
2151 prison_remove_one(lpr);
2152 sx_xlock(&allprison_lock);
2153 }
2154 mtx_lock(&pr->pr_mtx);
2155 }
2156 prison_remove_one(pr);
2157 return (0);
2158}
2159
2160static void
2161prison_remove_one(struct prison *pr)
2162{
2163 struct proc *p;
2164 int deuref;
2165
2166 /* If the prison was persistent, it is not anymore. */
2167 deuref = 0;
2168 if (pr->pr_flags & PR_PERSIST) {
2169 pr->pr_ref--;
2170 deuref = PD_DEUREF;
2171 pr->pr_flags &= ~PR_PERSIST;
2172 }
2173
2174 /*
2175 * jail_remove added a reference. If that's the only one, remove
2176 * the prison now.
2177 */
2178 KASSERT(pr->pr_ref > 0,
2179 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
2180 if (pr->pr_ref == 1) {
2181 prison_deref(pr,
2182 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
2183 return;
2184 }
2185
2186 mtx_unlock(&pr->pr_mtx);
2187 sx_xunlock(&allprison_lock);
2188 /*
2189 * Kill all processes unfortunate enough to be attached to this prison.
2190 */
2191 sx_slock(&allproc_lock);
2192 LIST_FOREACH(p, &allproc, p_list) {
2193 PROC_LOCK(p);
2194 if (p->p_state != PRS_NEW && p->p_ucred &&
2195 p->p_ucred->cr_prison == pr)
2196 psignal(p, SIGKILL);
2197 PROC_UNLOCK(p);
2198 }
2199 sx_sunlock(&allproc_lock);
2200 /* Remove the temporary reference added by jail_remove. */
2201 prison_deref(pr, deuref | PD_DEREF);
2202}
2203
2204
2205/*
2206 * struct jail_attach_args {
2207 * int jid;
2208 * };
2209 */
2210int
2211jail_attach(struct thread *td, struct jail_attach_args *uap)
2212{
2213 struct prison *pr;
2214 int error;
2215
2216 error = priv_check(td, PRIV_JAIL_ATTACH);
2217 if (error)
2218 return (error);
2219
2220 sx_slock(&allprison_lock);
2221 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2222 if (pr == NULL) {
2223 sx_sunlock(&allprison_lock);
2224 return (EINVAL);
2225 }
2226
2227 /*
2228 * Do not allow a process to attach to a prison that is not
2229 * considered to be "alive".
2230 */
2231 if (pr->pr_uref == 0) {
2232 mtx_unlock(&pr->pr_mtx);
2233 sx_sunlock(&allprison_lock);
2234 return (EINVAL);
2235 }
2236
2237 return (do_jail_attach(td, pr));
2238}
2239
2240static int
2241do_jail_attach(struct thread *td, struct prison *pr)
2242{
2243 struct prison *ppr;
2244 struct proc *p;
2245 struct ucred *newcred, *oldcred;
2246 int vfslocked, error;
2247
2248 /*
2249 * XXX: Note that there is a slight race here if two threads
2250 * in the same privileged process attempt to attach to two
2251 * different jails at the same time. It is important for
2252 * user processes not to do this, or they might end up with
2253 * a process root from one prison, but attached to the jail
2254 * of another.
2255 */
2256 pr->pr_ref++;
2257 pr->pr_uref++;
2258 mtx_unlock(&pr->pr_mtx);
2259
2260 /* Let modules do whatever they need to prepare for attaching. */
2261 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
2262 if (error) {
2263 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
2264 return (error);
2265 }
2266 sx_sunlock(&allprison_lock);
2267
2268 /*
2269 * Reparent the newly attached process to this jail.
2270 */
2271 ppr = td->td_ucred->cr_prison;
2272 p = td->td_proc;
2273 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
2274 if (error)
2275 goto e_revert_osd;
2276
2277 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
2278 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
2279 if ((error = change_dir(pr->pr_root, td)) != 0)
2280 goto e_unlock;
2281#ifdef MAC
2282 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
2283 goto e_unlock;
2284#endif
2285 VOP_UNLOCK(pr->pr_root, 0);
2286 if ((error = change_root(pr->pr_root, td)))
2287 goto e_unlock_giant;
2288 VFS_UNLOCK_GIANT(vfslocked);
2289
2290 newcred = crget();
2291 PROC_LOCK(p);
2292 oldcred = p->p_ucred;
2293 setsugid(p);
2294 crcopy(newcred, oldcred);
2295 newcred->cr_prison = pr;
2296 p->p_ucred = newcred;
2297 PROC_UNLOCK(p);
2298 crfree(oldcred);
2299 prison_deref(ppr, PD_DEREF | PD_DEUREF);
2300 return (0);
2301 e_unlock:
2302 VOP_UNLOCK(pr->pr_root, 0);
2303 e_unlock_giant:
2304 VFS_UNLOCK_GIANT(vfslocked);
2305 e_revert_osd:
2306 /* Tell modules this thread is still in its old jail after all. */
2307 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td);
2308 prison_deref(pr, PD_DEREF | PD_DEUREF);
2309 return (error);
2310}
2311
2312
2313/*
2314 * Returns a locked prison instance, or NULL on failure.
2315 */
2316struct prison *
2317prison_find(int prid)
2318{
2319 struct prison *pr;
2320
2321 sx_assert(&allprison_lock, SX_LOCKED);
2322 TAILQ_FOREACH(pr, &allprison, pr_list) {
2323 if (pr->pr_id == prid) {
2324 mtx_lock(&pr->pr_mtx);
2325 if (pr->pr_ref > 0)
2326 return (pr);
2327 mtx_unlock(&pr->pr_mtx);
2328 }
2329 }
2330 return (NULL);
2331}
2332
2333/*
2334 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
2335 */
2336struct prison *
2337prison_find_child(struct prison *mypr, int prid)
2338{
2339 struct prison *pr;
2340 int descend;
2341
2342 sx_assert(&allprison_lock, SX_LOCKED);
2343 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2344 if (pr->pr_id == prid) {
2345 mtx_lock(&pr->pr_mtx);
2346 if (pr->pr_ref > 0)
2347 return (pr);
2348 mtx_unlock(&pr->pr_mtx);
2349 }
2350 }
2351 return (NULL);
2352}
2353
2354/*
2355 * Look for the name relative to mypr. Returns a locked prison or NULL.
2356 */
2357struct prison *
2358prison_find_name(struct prison *mypr, const char *name)
2359{
2360 struct prison *pr, *deadpr;
2361 size_t mylen;
2362 int descend;
2363
2364 sx_assert(&allprison_lock, SX_LOCKED);
2365 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
2366 again:
2367 deadpr = NULL;
2368 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2369 if (!strcmp(pr->pr_name + mylen, name)) {
2370 mtx_lock(&pr->pr_mtx);
2371 if (pr->pr_ref > 0) {
2372 if (pr->pr_uref > 0)
2373 return (pr);
2374 deadpr = pr;
2375 }
2376 mtx_unlock(&pr->pr_mtx);
2377 }
2378 }
2379 /* There was no valid prison - perhaps there was a dying one. */
2380 if (deadpr != NULL) {
2381 mtx_lock(&deadpr->pr_mtx);
2382 if (deadpr->pr_ref == 0) {
2383 mtx_unlock(&deadpr->pr_mtx);
2384 goto again;
2385 }
2386 }
2387 return (deadpr);
2388}
2389
2390/*
2391 * See if a prison has the specific flag set.
2392 */
2393int
2394prison_flag(struct ucred *cred, unsigned flag)
2395{
2396
2397 /* This is an atomic read, so no locking is necessary. */
2398 return (cred->cr_prison->pr_flags & flag);
2399}
2400
2401int
2402prison_allow(struct ucred *cred, unsigned flag)
2403{
2404
2405 /* This is an atomic read, so no locking is necessary. */
2406 return (cred->cr_prison->pr_allow & flag);
2407}
2408
2409/*
2410 * Remove a prison reference. If that was the last reference, remove the
2411 * prison itself - but not in this context in case there are locks held.
2412 */
2413void
2414prison_free_locked(struct prison *pr)
2415{
2416
2417 mtx_assert(&pr->pr_mtx, MA_OWNED);
2418 pr->pr_ref--;
2419 if (pr->pr_ref == 0) {
2420 mtx_unlock(&pr->pr_mtx);
2421 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
2422 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2423 return;
2424 }
2425 mtx_unlock(&pr->pr_mtx);
2426}
2427
2428void
2429prison_free(struct prison *pr)
2430{
2431
2432 mtx_lock(&pr->pr_mtx);
2433 prison_free_locked(pr);
2434}
2435
2436static void
2437prison_complete(void *context, int pending)
2438{
2439
2440 prison_deref((struct prison *)context, 0);
2441}
2442
2443/*
2444 * Remove a prison reference (usually). This internal version assumes no
2445 * mutexes are held, except perhaps the prison itself. If there are no more
2446 * references, release and delist the prison. On completion, the prison lock
2447 * and the allprison lock are both unlocked.
2448 */
2449static void
2450prison_deref(struct prison *pr, int flags)
2451{
2452 struct prison *ppr, *tpr;
2453 int vfslocked;
2454
2455 if (!(flags & PD_LOCKED))
2456 mtx_lock(&pr->pr_mtx);
2457 /* Decrement the user references in a separate loop. */
2458 if (flags & PD_DEUREF) {
2459 for (tpr = pr;; tpr = tpr->pr_parent) {
2460 if (tpr != pr)
2461 mtx_lock(&tpr->pr_mtx);
2462 if (--tpr->pr_uref > 0)
2463 break;
2464 KASSERT(tpr != &prison0, ("prison0 pr_uref=0"));
2465 mtx_unlock(&tpr->pr_mtx);
2466 }
2467 /* Done if there were only user references to remove. */
2468 if (!(flags & PD_DEREF)) {
2469 mtx_unlock(&tpr->pr_mtx);
2470 if (flags & PD_LIST_SLOCKED)
2471 sx_sunlock(&allprison_lock);
2472 else if (flags & PD_LIST_XLOCKED)
2473 sx_xunlock(&allprison_lock);
2474 return;
2475 }
2476 if (tpr != pr) {
2477 mtx_unlock(&tpr->pr_mtx);
2478 mtx_lock(&pr->pr_mtx);
2479 }
2480 }
2481
2482 for (;;) {
2483 if (flags & PD_DEREF)
2484 pr->pr_ref--;
2485 /* If the prison still has references, nothing else to do. */
2486 if (pr->pr_ref > 0) {
2487 mtx_unlock(&pr->pr_mtx);
2488 if (flags & PD_LIST_SLOCKED)
2489 sx_sunlock(&allprison_lock);
2490 else if (flags & PD_LIST_XLOCKED)
2491 sx_xunlock(&allprison_lock);
2492 return;
2493 }
2494
2495 mtx_unlock(&pr->pr_mtx);
2496 if (flags & PD_LIST_SLOCKED) {
2497 if (!sx_try_upgrade(&allprison_lock)) {
2498 sx_sunlock(&allprison_lock);
2499 sx_xlock(&allprison_lock);
2500 }
2501 } else if (!(flags & PD_LIST_XLOCKED))
2502 sx_xlock(&allprison_lock);
2503
2504 TAILQ_REMOVE(&allprison, pr, pr_list);
2505 LIST_REMOVE(pr, pr_sibling);
2506 ppr = pr->pr_parent;
2507 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
2508 tpr->pr_childcount--;
2509 sx_xunlock(&allprison_lock);
2510
2511#ifdef VIMAGE
2512 if (pr->pr_vnet != ppr->pr_vnet)
2513 vnet_destroy(pr->pr_vnet);
2514#endif
2515 if (pr->pr_root != NULL) {
2516 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
2517 vrele(pr->pr_root);
2518 VFS_UNLOCK_GIANT(vfslocked);
2519 }
2520 mtx_destroy(&pr->pr_mtx);
2521#ifdef INET
2522 free(pr->pr_ip4, M_PRISON);
2523#endif
2524#ifdef INET6
2525 free(pr->pr_ip6, M_PRISON);
2526#endif
2527 if (pr->pr_cpuset != NULL)
2528 cpuset_rel(pr->pr_cpuset);
2529 osd_jail_exit(pr);
2530 free(pr, M_PRISON);
2531
2532 /* Removing a prison frees a reference on its parent. */
2533 pr = ppr;
2534 mtx_lock(&pr->pr_mtx);
2535 flags = PD_DEREF;
2536 }
2537}
2538
2539void
2540prison_hold_locked(struct prison *pr)
2541{
2542
2543 mtx_assert(&pr->pr_mtx, MA_OWNED);
2544 KASSERT(pr->pr_ref > 0,
2545 ("Trying to hold dead prison (jid=%d).", pr->pr_id));
2546 pr->pr_ref++;
2547}
2548
2549void
2550prison_hold(struct prison *pr)
2551{
2552
2553 mtx_lock(&pr->pr_mtx);
2554 prison_hold_locked(pr);
2555 mtx_unlock(&pr->pr_mtx);
2556}
2557
2558void
2559prison_proc_hold(struct prison *pr)
2560{
2561
2562 mtx_lock(&pr->pr_mtx);
2563 KASSERT(pr->pr_uref > 0,
2564 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
2565 pr->pr_uref++;
2566 mtx_unlock(&pr->pr_mtx);
2567}
2568
2569void
2570prison_proc_free(struct prison *pr)
2571{
2572
2573 mtx_lock(&pr->pr_mtx);
2574 KASSERT(pr->pr_uref > 0,
2575 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
2576 prison_deref(pr, PD_DEUREF | PD_LOCKED);
2577}
2578
2579
2580#ifdef INET
2581/*
2582 * Restrict a prison's IP address list with its parent's, possibly replacing
2583 * it. Return true if the replacement buffer was used (or would have been).
2584 */
2585static int
2586prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
2587{
2588 int ii, ij, used;
2589 struct prison *ppr;
2590
2591 ppr = pr->pr_parent;
2592 if (!(pr->pr_flags & PR_IP4_USER)) {
2593 /* This has no user settings, so just copy the parent's list. */
2594 if (pr->pr_ip4s < ppr->pr_ip4s) {
2595 /*
2596 * There's no room for the parent's list. Use the
2597 * new list buffer, which is assumed to be big enough
2598 * (if it was passed). If there's no buffer, try to
2599 * allocate one.
2600 */
2601 used = 1;
2602 if (newip4 == NULL) {
2603 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
2604 M_PRISON, M_NOWAIT);
2605 if (newip4 != NULL)
2606 used = 0;
2607 }
2608 if (newip4 != NULL) {
2609 bcopy(ppr->pr_ip4, newip4,
2610 ppr->pr_ip4s * sizeof(*newip4));
2611 free(pr->pr_ip4, M_PRISON);
2612 pr->pr_ip4 = newip4;
2613 pr->pr_ip4s = ppr->pr_ip4s;
2614 }
2615 return (used);
2616 }
2617 pr->pr_ip4s = ppr->pr_ip4s;
2618 if (pr->pr_ip4s > 0)
2619 bcopy(ppr->pr_ip4, pr->pr_ip4,
2620 pr->pr_ip4s * sizeof(*newip4));
2621 else if (pr->pr_ip4 != NULL) {
2622 free(pr->pr_ip4, M_PRISON);
2623 pr->pr_ip4 = NULL;
2624 }
2625 } else if (pr->pr_ip4s > 0) {
2626 /* Remove addresses that aren't in the parent. */
2627 for (ij = 0; ij < ppr->pr_ip4s; ij++)
2628 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
2629 break;
2630 if (ij < ppr->pr_ip4s)
2631 ii = 1;
2632 else {
2633 bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
2634 --pr->pr_ip4s * sizeof(*pr->pr_ip4));
2635 ii = 0;
2636 }
2637 for (ij = 1; ii < pr->pr_ip4s; ) {
2638 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
2639 ii++;
2640 continue;
2641 }
2642 switch (ij >= ppr->pr_ip4s ? -1 :
2643 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
2644 case -1:
2645 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
2646 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
2647 break;
2648 case 0:
2649 ii++;
2650 ij++;
2651 break;
2652 case 1:
2653 ij++;
2654 break;
2655 }
2656 }
2657 if (pr->pr_ip4s == 0) {
2658 pr->pr_flags |= PR_IP4_DISABLE;
2659 free(pr->pr_ip4, M_PRISON);
2660 pr->pr_ip4 = NULL;
2661 }
2662 }
2663 return (0);
2664}
2665
2666/*
2667 * Pass back primary IPv4 address of this jail.
2668 *
2669 * If not restricted return success but do not alter the address. Caller has
2670 * to make sure to initialize it correctly (e.g. INADDR_ANY).
2671 *
2672 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2673 * Address returned in NBO.
2674 */
2675int
2676prison_get_ip4(struct ucred *cred, struct in_addr *ia)
2677{
2678 struct prison *pr;
2679
2680 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2681 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2682
2683 pr = cred->cr_prison;
2684 if (!(pr->pr_flags & PR_IP4))
2685 return (0);
2686 mtx_lock(&pr->pr_mtx);
2687 if (!(pr->pr_flags & PR_IP4)) {
2688 mtx_unlock(&pr->pr_mtx);
2689 return (0);
2690 }
2691 if (pr->pr_ip4 == NULL) {
2692 mtx_unlock(&pr->pr_mtx);
2693 return (EAFNOSUPPORT);
2694 }
2695
2696 ia->s_addr = pr->pr_ip4[0].s_addr;
2697 mtx_unlock(&pr->pr_mtx);
2698 return (0);
2699}
2700
2701/*
2702 * Return 1 if we should do proper source address selection or are not jailed.
2703 * We will return 0 if we should bypass source address selection in favour
2704 * of the primary jail IPv4 address. Only in this case *ia will be updated and
2705 * returned in NBO.
2706 * Return EAFNOSUPPORT, in case this jail does not allow IPv4.
2707 */
2708int
2709prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
2710{
2711 struct prison *pr;
2712 struct in_addr lia;
2713 int error;
2714
2715 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2716 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2717
2718 if (!jailed(cred))
2719 return (1);
2720
2721 pr = cred->cr_prison;
2722 if (pr->pr_flags & PR_IP4_SADDRSEL)
2723 return (1);
2724
2725 lia.s_addr = INADDR_ANY;
2726 error = prison_get_ip4(cred, &lia);
2727 if (error)
2728 return (error);
2729 if (lia.s_addr == INADDR_ANY)
2730 return (1);
2731
2732 ia->s_addr = lia.s_addr;
2733 return (0);
2734}
2735
2736/*
2737 * Return true if pr1 and pr2 have the same IPv4 address restrictions.
2738 */
2739int
2740prison_equal_ip4(struct prison *pr1, struct prison *pr2)
2741{
2742
2743 if (pr1 == pr2)
2744 return (1);
2745
2746 /*
2747 * No need to lock since the PR_IP4_USER flag can't be altered for
2748 * existing prisons.
2749 */
2750 while (pr1 != &prison0 &&
2751#ifdef VIMAGE
2752 !(pr1->pr_flags & PR_VNET) &&
2753#endif
2754 !(pr1->pr_flags & PR_IP4_USER))
2755 pr1 = pr1->pr_parent;
2756 while (pr2 != &prison0 &&
2757#ifdef VIMAGE
2758 !(pr2->pr_flags & PR_VNET) &&
2759#endif
2760 !(pr2->pr_flags & PR_IP4_USER))
2761 pr2 = pr2->pr_parent;
2762 return (pr1 == pr2);
2763}
2764
2765/*
2766 * Make sure our (source) address is set to something meaningful to this
2767 * jail.
2768 *
2769 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2770 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2771 * doesn't allow IPv4. Address passed in in NBO and returned in NBO.
2772 */
2773int
2774prison_local_ip4(struct ucred *cred, struct in_addr *ia)
2775{
2776 struct prison *pr;
2777 struct in_addr ia0;
2778 int error;
2779
2780 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2781 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2782
2783 pr = cred->cr_prison;
2784 if (!(pr->pr_flags & PR_IP4))
2785 return (0);
2786 mtx_lock(&pr->pr_mtx);
2787 if (!(pr->pr_flags & PR_IP4)) {
2788 mtx_unlock(&pr->pr_mtx);
2789 return (0);
2790 }
2791 if (pr->pr_ip4 == NULL) {
2792 mtx_unlock(&pr->pr_mtx);
2793 return (EAFNOSUPPORT);
2794 }
2795
2796 ia0.s_addr = ntohl(ia->s_addr);
2797 if (ia0.s_addr == INADDR_LOOPBACK) {
2798 ia->s_addr = pr->pr_ip4[0].s_addr;
2799 mtx_unlock(&pr->pr_mtx);
2800 return (0);
2801 }
2802
2803 if (ia0.s_addr == INADDR_ANY) {
2804 /*
2805 * In case there is only 1 IPv4 address, bind directly.
2806 */
2807 if (pr->pr_ip4s == 1)
2808 ia->s_addr = pr->pr_ip4[0].s_addr;
2809 mtx_unlock(&pr->pr_mtx);
2810 return (0);
2811 }
2812
2813 error = _prison_check_ip4(pr, ia);
2814 mtx_unlock(&pr->pr_mtx);
2815 return (error);
2816}
2817
2818/*
2819 * Rewrite destination address in case we will connect to loopback address.
2820 *
2821 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2822 * Address passed in in NBO and returned in NBO.
2823 */
2824int
2825prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
2826{
2827 struct prison *pr;
2828
2829 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2830 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2831
2832 pr = cred->cr_prison;
2833 if (!(pr->pr_flags & PR_IP4))
2834 return (0);
2835 mtx_lock(&pr->pr_mtx);
2836 if (!(pr->pr_flags & PR_IP4)) {
2837 mtx_unlock(&pr->pr_mtx);
2838 return (0);
2839 }
2840 if (pr->pr_ip4 == NULL) {
2841 mtx_unlock(&pr->pr_mtx);
2842 return (EAFNOSUPPORT);
2843 }
2844
2845 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) {
2846 ia->s_addr = pr->pr_ip4[0].s_addr;
2847 mtx_unlock(&pr->pr_mtx);
2848 return (0);
2849 }
2850
2851 /*
2852 * Return success because nothing had to be changed.
2853 */
2854 mtx_unlock(&pr->pr_mtx);
2855 return (0);
2856}
2857
2858/*
2859 * Check if given address belongs to the jail referenced by cred/prison.
2860 *
2861 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2862 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2863 * doesn't allow IPv4. Address passed in in NBO.
2864 */
2865static int
2866_prison_check_ip4(struct prison *pr, struct in_addr *ia)
2867{
2868 int i, a, z, d;
2869
2870 /*
2871 * Check the primary IP.
2872 */
2873 if (pr->pr_ip4[0].s_addr == ia->s_addr)
2874 return (0);
2875
2876 /*
2877 * All the other IPs are sorted so we can do a binary search.
2878 */
2879 a = 0;
2880 z = pr->pr_ip4s - 2;
2881 while (a <= z) {
2882 i = (a + z) / 2;
2883 d = qcmp_v4(&pr->pr_ip4[i+1], ia);
2884 if (d > 0)
2885 z = i - 1;
2886 else if (d < 0)
2887 a = i + 1;
2888 else
2889 return (0);
2890 }
2891
2892 return (EADDRNOTAVAIL);
2893}
2894
2895int
2896prison_check_ip4(struct ucred *cred, struct in_addr *ia)
2897{
2898 struct prison *pr;
2899 int error;
2900
2901 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2902 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2903
2904 pr = cred->cr_prison;
2905 if (!(pr->pr_flags & PR_IP4))
2906 return (0);
2907 mtx_lock(&pr->pr_mtx);
2908 if (!(pr->pr_flags & PR_IP4)) {
2909 mtx_unlock(&pr->pr_mtx);
2910 return (0);
2911 }
2912 if (pr->pr_ip4 == NULL) {
2913 mtx_unlock(&pr->pr_mtx);
2914 return (EAFNOSUPPORT);
2915 }
2916
2917 error = _prison_check_ip4(pr, ia);
2918 mtx_unlock(&pr->pr_mtx);
2919 return (error);
2920}
2921#endif
2922
2923#ifdef INET6
2924static int
2925prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
2926{
2927 int ii, ij, used;
2928 struct prison *ppr;
2929
2930 ppr = pr->pr_parent;
2931 if (!(pr->pr_flags & PR_IP6_USER)) {
2932 /* This has no user settings, so just copy the parent's list. */
2933 if (pr->pr_ip6s < ppr->pr_ip6s) {
2934 /*
2935 * There's no room for the parent's list. Use the
2936 * new list buffer, which is assumed to be big enough
2937 * (if it was passed). If there's no buffer, try to
2938 * allocate one.
2939 */
2940 used = 1;
2941 if (newip6 == NULL) {
2942 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
2943 M_PRISON, M_NOWAIT);
2944 if (newip6 != NULL)
2945 used = 0;
2946 }
2947 if (newip6 != NULL) {
2948 bcopy(ppr->pr_ip6, newip6,
2949 ppr->pr_ip6s * sizeof(*newip6));
2950 free(pr->pr_ip6, M_PRISON);
2951 pr->pr_ip6 = newip6;
2952 pr->pr_ip6s = ppr->pr_ip6s;
2953 }
2954 return (used);
2955 }
2956 pr->pr_ip6s = ppr->pr_ip6s;
2957 if (pr->pr_ip6s > 0)
2958 bcopy(ppr->pr_ip6, pr->pr_ip6,
2959 pr->pr_ip6s * sizeof(*newip6));
2960 else if (pr->pr_ip6 != NULL) {
2961 free(pr->pr_ip6, M_PRISON);
2962 pr->pr_ip6 = NULL;
2963 }
2964 } else if (pr->pr_ip6s > 0) {
2965 /* Remove addresses that aren't in the parent. */
2966 for (ij = 0; ij < ppr->pr_ip6s; ij++)
2967 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
2968 &ppr->pr_ip6[ij]))
2969 break;
2970 if (ij < ppr->pr_ip6s)
2971 ii = 1;
2972 else {
2973 bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
2974 --pr->pr_ip6s * sizeof(*pr->pr_ip6));
2975 ii = 0;
2976 }
2977 for (ij = 1; ii < pr->pr_ip6s; ) {
2978 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
2979 &ppr->pr_ip6[0])) {
2980 ii++;
2981 continue;
2982 }
2983 switch (ij >= ppr->pr_ip4s ? -1 :
2984 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
2985 case -1:
2986 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
2987 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
2988 break;
2989 case 0:
2990 ii++;
2991 ij++;
2992 break;
2993 case 1:
2994 ij++;
2995 break;
2996 }
2997 }
2998 if (pr->pr_ip6s == 0) {
2999 pr->pr_flags |= PR_IP6_DISABLE;
3000 free(pr->pr_ip6, M_PRISON);
3001 pr->pr_ip6 = NULL;
3002 }
3003 }
3004 return 0;
3005}
3006
3007/*
3008 * Pass back primary IPv6 address for this jail.
3009 *
3010 * If not restricted return success but do not alter the address. Caller has
3011 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
3012 *
3013 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3014 */
3015int
3016prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
3017{
3018 struct prison *pr;
3019
3020 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3021 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3022
3023 pr = cred->cr_prison;
3024 if (!(pr->pr_flags & PR_IP6))
3025 return (0);
3026 mtx_lock(&pr->pr_mtx);
3027 if (!(pr->pr_flags & PR_IP6)) {
3028 mtx_unlock(&pr->pr_mtx);
3029 return (0);
3030 }
3031 if (pr->pr_ip6 == NULL) {
3032 mtx_unlock(&pr->pr_mtx);
3033 return (EAFNOSUPPORT);
3034 }
3035
3036 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3037 mtx_unlock(&pr->pr_mtx);
3038 return (0);
3039}
3040
3041/*
3042 * Return 1 if we should do proper source address selection or are not jailed.
3043 * We will return 0 if we should bypass source address selection in favour
3044 * of the primary jail IPv6 address. Only in this case *ia will be updated and
3045 * returned in NBO.
3046 * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
3047 */
3048int
3049prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
3050{
3051 struct prison *pr;
3052 struct in6_addr lia6;
3053 int error;
3054
3055 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3056 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3057
3058 if (!jailed(cred))
3059 return (1);
3060
3061 pr = cred->cr_prison;
3062 if (pr->pr_flags & PR_IP6_SADDRSEL)
3063 return (1);
3064
3065 lia6 = in6addr_any;
3066 error = prison_get_ip6(cred, &lia6);
3067 if (error)
3068 return (error);
3069 if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
3070 return (1);
3071
3072 bcopy(&lia6, ia6, sizeof(struct in6_addr));
3073 return (0);
3074}
3075
3076/*
3077 * Return true if pr1 and pr2 have the same IPv6 address restrictions.
3078 */
3079int
3080prison_equal_ip6(struct prison *pr1, struct prison *pr2)
3081{
3082
3083 if (pr1 == pr2)
3084 return (1);
3085
3086 while (pr1 != &prison0 &&
3087#ifdef VIMAGE
3088 !(pr1->pr_flags & PR_VNET) &&
3089#endif
3090 !(pr1->pr_flags & PR_IP6_USER))
3091 pr1 = pr1->pr_parent;
3092 while (pr2 != &prison0 &&
3093#ifdef VIMAGE
3094 !(pr2->pr_flags & PR_VNET) &&
3095#endif
3096 !(pr2->pr_flags & PR_IP6_USER))
3097 pr2 = pr2->pr_parent;
3098 return (pr1 == pr2);
3099}
3100
3101/*
3102 * Make sure our (source) address is set to something meaningful to this jail.
3103 *
3104 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
3105 * when needed while binding.
3106 *
3107 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3108 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3109 * doesn't allow IPv6.
3110 */
3111int
3112prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
3113{
3114 struct prison *pr;
3115 int error;
3116
3117 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3118 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3119
3120 pr = cred->cr_prison;
3121 if (!(pr->pr_flags & PR_IP6))
3122 return (0);
3123 mtx_lock(&pr->pr_mtx);
3124 if (!(pr->pr_flags & PR_IP6)) {
3125 mtx_unlock(&pr->pr_mtx);
3126 return (0);
3127 }
3128 if (pr->pr_ip6 == NULL) {
3129 mtx_unlock(&pr->pr_mtx);
3130 return (EAFNOSUPPORT);
3131 }
3132
3133 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3134 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3135 mtx_unlock(&pr->pr_mtx);
3136 return (0);
3137 }
3138
3139 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
3140 /*
3141 * In case there is only 1 IPv6 address, and v6only is true,
3142 * then bind directly.
3143 */
3144 if (v6only != 0 && pr->pr_ip6s == 1)
3145 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3146 mtx_unlock(&pr->pr_mtx);
3147 return (0);
3148 }
3149
3150 error = _prison_check_ip6(pr, ia6);
3151 mtx_unlock(&pr->pr_mtx);
3152 return (error);
3153}
3154
3155/*
3156 * Rewrite destination address in case we will connect to loopback address.
3157 *
3158 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3159 */
3160int
3161prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
3162{
3163 struct prison *pr;
3164
3165 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3166 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3167
3168 pr = cred->cr_prison;
3169 if (!(pr->pr_flags & PR_IP6))
3170 return (0);
3171 mtx_lock(&pr->pr_mtx);
3172 if (!(pr->pr_flags & PR_IP6)) {
3173 mtx_unlock(&pr->pr_mtx);
3174 return (0);
3175 }
3176 if (pr->pr_ip6 == NULL) {
3177 mtx_unlock(&pr->pr_mtx);
3178 return (EAFNOSUPPORT);
3179 }
3180
3181 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3182 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3183 mtx_unlock(&pr->pr_mtx);
3184 return (0);
3185 }
3186
3187 /*
3188 * Return success because nothing had to be changed.
3189 */
3190 mtx_unlock(&pr->pr_mtx);
3191 return (0);
3192}
3193
3194/*
3195 * Check if given address belongs to the jail referenced by cred/prison.
3196 *
3197 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3198 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3199 * doesn't allow IPv6.
3200 */
3201static int
3202_prison_check_ip6(struct prison *pr, struct in6_addr *ia6)
3203{
3204 int i, a, z, d;
3205
3206 /*
3207 * Check the primary IP.
3208 */
3209 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
3210 return (0);
3211
3212 /*
3213 * All the other IPs are sorted so we can do a binary search.
3214 */
3215 a = 0;
3216 z = pr->pr_ip6s - 2;
3217 while (a <= z) {
3218 i = (a + z) / 2;
3219 d = qcmp_v6(&pr->pr_ip6[i+1], ia6);
3220 if (d > 0)
3221 z = i - 1;
3222 else if (d < 0)
3223 a = i + 1;
3224 else
3225 return (0);
3226 }
3227
3228 return (EADDRNOTAVAIL);
3229}
3230
3231int
3232prison_check_ip6(struct ucred *cred, struct in6_addr *ia6)
3233{
3234 struct prison *pr;
3235 int error;
3236
3237 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3238 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3239
3240 pr = cred->cr_prison;
3241 if (!(pr->pr_flags & PR_IP6))
3242 return (0);
3243 mtx_lock(&pr->pr_mtx);
3244 if (!(pr->pr_flags & PR_IP6)) {
3245 mtx_unlock(&pr->pr_mtx);
3246 return (0);
3247 }
3248 if (pr->pr_ip6 == NULL) {
3249 mtx_unlock(&pr->pr_mtx);
3250 return (EAFNOSUPPORT);
3251 }
3252
3253 error = _prison_check_ip6(pr, ia6);
3254 mtx_unlock(&pr->pr_mtx);
3255 return (error);
3256}
3257#endif
3258
3259/*
3260 * Check if a jail supports the given address family.
3261 *
3262 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
3263 * if not.
3264 */
3265int
3266prison_check_af(struct ucred *cred, int af)
3267{
3268 struct prison *pr;
3269 int error;
3270
3271 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3272
3273 pr = cred->cr_prison;
3274#ifdef VIMAGE
3275 /* Prisons with their own network stack are not limited. */
3276 if (prison_owns_vnet(cred))
3277 return (0);
3278#endif
3279
3280 error = 0;
3281 switch (af)
3282 {
3283#ifdef INET
3284 case AF_INET:
3285 if (pr->pr_flags & PR_IP4)
3286 {
3287 mtx_lock(&pr->pr_mtx);
3288 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
3289 error = EAFNOSUPPORT;
3290 mtx_unlock(&pr->pr_mtx);
3291 }
3292 break;
3293#endif
3294#ifdef INET6
3295 case AF_INET6:
3296 if (pr->pr_flags & PR_IP6)
3297 {
3298 mtx_lock(&pr->pr_mtx);
3299 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
3300 error = EAFNOSUPPORT;
3301 mtx_unlock(&pr->pr_mtx);
3302 }
3303 break;
3304#endif
3305 case AF_LOCAL:
3306 case AF_ROUTE:
3307 break;
3308 default:
3309 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
3310 error = EAFNOSUPPORT;
3311 }
3312 return (error);
3313}
3314
3315/*
3316 * Check if given address belongs to the jail referenced by cred (wrapper to
3317 * prison_check_ip[46]).
3318 *
3319 * Returns 0 if jail doesn't restrict the address family or if address belongs
3320 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
3321 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
3322 */
3323int
3324prison_if(struct ucred *cred, struct sockaddr *sa)
3325{
3326#ifdef INET
3327 struct sockaddr_in *sai;
3328#endif
3329#ifdef INET6
3330 struct sockaddr_in6 *sai6;
3331#endif
3332 int error;
3333
3334 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3335 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
3336
3337#ifdef VIMAGE
3338 if (prison_owns_vnet(cred))
3339 return (0);
3340#endif
3341
3342 error = 0;
3343 switch (sa->sa_family)
3344 {
3345#ifdef INET
3346 case AF_INET:
3347 sai = (struct sockaddr_in *)sa;
3348 error = prison_check_ip4(cred, &sai->sin_addr);
3349 break;
3350#endif
3351#ifdef INET6
3352 case AF_INET6:
3353 sai6 = (struct sockaddr_in6 *)sa;
3354 error = prison_check_ip6(cred, &sai6->sin6_addr);
3355 break;
3356#endif
3357 default:
3358 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
3359 error = EAFNOSUPPORT;
3360 }
3361 return (error);
3362}
3363
3364/*
3365 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
3366 */
3367int
3368prison_check(struct ucred *cred1, struct ucred *cred2)
3369{
3370
3371 return ((cred1->cr_prison == cred2->cr_prison ||
3372 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
3373}
3374
3375/*
3376 * Return 1 if p2 is a child of p1, otherwise 0.
3377 */
3378int
3379prison_ischild(struct prison *pr1, struct prison *pr2)
3380{
3381
3382 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
3383 if (pr1 == pr2)
3384 return (1);
3385 return (0);
3386}
3387
3388/*
3389 * Return 1 if the passed credential is in a jail, otherwise 0.
3390 */
3391int
3392jailed(struct ucred *cred)
3393{
3394
3395 return (cred->cr_prison != &prison0);
3396}
3397
3398/*
3399 * Return 1 if the passed credential is in a jail and that jail does not
3400 * have its own virtual network stack, otherwise 0.
3401 */
3402int
3403jailed_without_vnet(struct ucred *cred)
3404{
3405
3406 if (!jailed(cred))
3407 return (0);
3408#ifdef VIMAGE
3409 if (prison_owns_vnet(cred))
3410 return (0);
3411#endif
3412
3413 return (1);
3414}
3415
3416/*
3417 * Return the correct hostname (domainname, et al) for the passed credential.
3418 */
3419void
3420getcredhostname(struct ucred *cred, char *buf, size_t size)
3421{
3422 struct prison *pr;
3423
3424 /*
3425 * A NULL credential can be used to shortcut to the physical
3426 * system's hostname.
3427 */
3428 pr = (cred != NULL) ? cred->cr_prison : &prison0;
3429 mtx_lock(&pr->pr_mtx);
3430 strlcpy(buf, pr->pr_hostname, size);
3431 mtx_unlock(&pr->pr_mtx);
3432}
3433
3434void
3435getcreddomainname(struct ucred *cred, char *buf, size_t size)
3436{
3437
3438 mtx_lock(&cred->cr_prison->pr_mtx);
3439 strlcpy(buf, cred->cr_prison->pr_domainname, size);
3440 mtx_unlock(&cred->cr_prison->pr_mtx);
3441}
3442
3443void
3444getcredhostuuid(struct ucred *cred, char *buf, size_t size)
3445{
3446
3447 mtx_lock(&cred->cr_prison->pr_mtx);
3448 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
3449 mtx_unlock(&cred->cr_prison->pr_mtx);
3450}
3451
3452void
3453getcredhostid(struct ucred *cred, unsigned long *hostid)
3454{
3455
3456 mtx_lock(&cred->cr_prison->pr_mtx);
3457 *hostid = cred->cr_prison->pr_hostid;
3458 mtx_unlock(&cred->cr_prison->pr_mtx);
3459}
3460
3461#ifdef VIMAGE
3462/*
3463 * Determine whether the prison represented by cred owns
3464 * its vnet rather than having it inherited.
3465 *
3466 * Returns 1 in case the prison owns the vnet, 0 otherwise.
3467 */
3468int
3469prison_owns_vnet(struct ucred *cred)
3470{
3471
3472 /*
3473 * vnets cannot be added/removed after jail creation,
3474 * so no need to lock here.
3475 */
3476 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
3477}
3478#endif
3479
3480/*
3481 * Determine whether the subject represented by cred can "see"
3482 * status of a mount point.
3483 * Returns: 0 for permitted, ENOENT otherwise.
3484 * XXX: This function should be called cr_canseemount() and should be
3485 * placed in kern_prot.c.
3486 */
3487int
3488prison_canseemount(struct ucred *cred, struct mount *mp)
3489{
3490 struct prison *pr;
3491 struct statfs *sp;
3492 size_t len;
3493
3494 pr = cred->cr_prison;
3495 if (pr->pr_enforce_statfs == 0)
3496 return (0);
3497 if (pr->pr_root->v_mount == mp)
3498 return (0);
3499 if (pr->pr_enforce_statfs == 2)
3500 return (ENOENT);
3501 /*
3502 * If jail's chroot directory is set to "/" we should be able to see
3503 * all mount-points from inside a jail.
3504 * This is ugly check, but this is the only situation when jail's
3505 * directory ends with '/'.
3506 */
3507 if (strcmp(pr->pr_path, "/") == 0)
3508 return (0);
3509 len = strlen(pr->pr_path);
3510 sp = &mp->mnt_stat;
3511 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
3512 return (ENOENT);
3513 /*
3514 * Be sure that we don't have situation where jail's root directory
3515 * is "/some/path" and mount point is "/some/pathpath".
3516 */
3517 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
3518 return (ENOENT);
3519 return (0);
3520}
3521
3522void
3523prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
3524{
3525 char jpath[MAXPATHLEN];
3526 struct prison *pr;
3527 size_t len;
3528
3529 pr = cred->cr_prison;
3530 if (pr->pr_enforce_statfs == 0)
3531 return;
3532 if (prison_canseemount(cred, mp) != 0) {
3533 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3534 strlcpy(sp->f_mntonname, "[restricted]",
3535 sizeof(sp->f_mntonname));
3536 return;
3537 }
3538 if (pr->pr_root->v_mount == mp) {
3539 /*
3540 * Clear current buffer data, so we are sure nothing from
3541 * the valid path left there.
3542 */
3543 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3544 *sp->f_mntonname = '/';
3545 return;
3546 }
3547 /*
3548 * If jail's chroot directory is set to "/" we should be able to see
3549 * all mount-points from inside a jail.
3550 */
3551 if (strcmp(pr->pr_path, "/") == 0)
3552 return;
3553 len = strlen(pr->pr_path);
3554 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
3555 /*
3556 * Clear current buffer data, so we are sure nothing from
3557 * the valid path left there.
3558 */
3559 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3560 if (*jpath == '\0') {
3561 /* Should never happen. */
3562 *sp->f_mntonname = '/';
3563 } else {
3564 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
3565 }
3566}
3567
3568/*
3569 * Check with permission for a specific privilege is granted within jail. We
3570 * have a specific list of accepted privileges; the rest are denied.
3571 */
3572int
3573prison_priv_check(struct ucred *cred, int priv)
3574{
3575
3576 if (!jailed(cred))
3577 return (0);
3578
3579#ifdef VIMAGE
3580 /*
3581 * Privileges specific to prisons with a virtual network stack.
3582 * There might be a duplicate entry here in case the privilege
3583 * is only granted conditionally in the legacy jail case.
3584 */
3585 switch (priv) {
3586#ifdef notyet
3587 /*
3588 * NFS-specific privileges.
3589 */
3590 case PRIV_NFS_DAEMON:
3591 case PRIV_NFS_LOCKD:
3592#endif
3593 /*
3594 * Network stack privileges.
3595 */
3596 case PRIV_NET_BRIDGE:
3597 case PRIV_NET_GRE:
3598 case PRIV_NET_BPF:
3599 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
3600 case PRIV_NET_ROUTE:
3601 case PRIV_NET_TAP:
3602 case PRIV_NET_SETIFMTU:
3603 case PRIV_NET_SETIFFLAGS:
3604 case PRIV_NET_SETIFCAP:
3605 case PRIV_NET_SETIFDESCR:
3606 case PRIV_NET_SETIFNAME :
3607 case PRIV_NET_SETIFMETRIC:
3608 case PRIV_NET_SETIFPHYS:
3609 case PRIV_NET_SETIFMAC:
3610 case PRIV_NET_ADDMULTI:
3611 case PRIV_NET_DELMULTI:
3612 case PRIV_NET_HWIOCTL:
3613 case PRIV_NET_SETLLADDR:
3614 case PRIV_NET_ADDIFGROUP:
3615 case PRIV_NET_DELIFGROUP:
3616 case PRIV_NET_IFCREATE:
3617 case PRIV_NET_IFDESTROY:
3618 case PRIV_NET_ADDIFADDR:
3619 case PRIV_NET_DELIFADDR:
3620 case PRIV_NET_LAGG:
3621 case PRIV_NET_GIF:
3622 case PRIV_NET_SETIFVNET:
3623
3624 /*
3625 * 802.11-related privileges.
3626 */
3627 case PRIV_NET80211_GETKEY:
3628#ifdef notyet
3629 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */
3630#endif
3631
3632#ifdef notyet
3633 /*
3634 * AppleTalk privileges.
3635 */
3636 case PRIV_NETATALK_RESERVEDPORT:
3637
3638 /*
3639 * ATM privileges.
3640 */
3641 case PRIV_NETATM_CFG:
3642 case PRIV_NETATM_ADD:
3643 case PRIV_NETATM_DEL:
3644 case PRIV_NETATM_SET:
3645
3646 /*
3647 * Bluetooth privileges.
3648 */
3649 case PRIV_NETBLUETOOTH_RAW:
3650#endif
3651
3652 /*
3653 * Netgraph and netgraph module privileges.
3654 */
3655 case PRIV_NETGRAPH_CONTROL:
3656#ifdef notyet
3657 case PRIV_NETGRAPH_TTY:
3658#endif
3659
3660 /*
3661 * IPv4 and IPv6 privileges.
3662 */
3663 case PRIV_NETINET_IPFW:
3664 case PRIV_NETINET_DIVERT:
3665 case PRIV_NETINET_PF:
3666 case PRIV_NETINET_DUMMYNET:
3667 case PRIV_NETINET_CARP:
3668 case PRIV_NETINET_MROUTE:
3669 case PRIV_NETINET_RAW:
3670 case PRIV_NETINET_ADDRCTRL6:
3671 case PRIV_NETINET_ND6:
3672 case PRIV_NETINET_SCOPE6:
3673 case PRIV_NETINET_ALIFETIME6:
3674 case PRIV_NETINET_IPSEC:
3675 case PRIV_NETINET_BINDANY:
3676
3677#ifdef notyet
3678 /*
3679 * IPX/SPX privileges.
3680 */
3681 case PRIV_NETIPX_RESERVEDPORT:
3682 case PRIV_NETIPX_RAW:
3683
3684 /*
3685 * NCP privileges.
3686 */
3687 case PRIV_NETNCP:
3688
3689 /*
3690 * SMB privileges.
3691 */
3692 case PRIV_NETSMB:
3693#endif
3694
3695 /*
3696 * No default: or deny here.
3697 * In case of no permit fall through to next switch().
3698 */
3699 if (cred->cr_prison->pr_flags & PR_VNET)
3700 return (0);
3701 }
3702#endif /* VIMAGE */
3703
3704 switch (priv) {
3705
3706 /*
3707 * Allow ktrace privileges for root in jail.
3708 */
3709 case PRIV_KTRACE:
3710
3711#if 0
3712 /*
3713 * Allow jailed processes to configure audit identity and
3714 * submit audit records (login, etc). In the future we may
3715 * want to further refine the relationship between audit and
3716 * jail.
3717 */
3718 case PRIV_AUDIT_GETAUDIT:
3719 case PRIV_AUDIT_SETAUDIT:
3720 case PRIV_AUDIT_SUBMIT:
3721#endif
3722
3723 /*
3724 * Allow jailed processes to manipulate process UNIX
3725 * credentials in any way they see fit.
3726 */
3727 case PRIV_CRED_SETUID:
3728 case PRIV_CRED_SETEUID:
3729 case PRIV_CRED_SETGID:
3730 case PRIV_CRED_SETEGID:
3731 case PRIV_CRED_SETGROUPS:
3732 case PRIV_CRED_SETREUID:
3733 case PRIV_CRED_SETREGID:
3734 case PRIV_CRED_SETRESUID:
3735 case PRIV_CRED_SETRESGID:
3736
3737 /*
3738 * Jail implements visibility constraints already, so allow
3739 * jailed root to override uid/gid-based constraints.
3740 */
3741 case PRIV_SEEOTHERGIDS:
3742 case PRIV_SEEOTHERUIDS:
3743
3744 /*
3745 * Jail implements inter-process debugging limits already, so
3746 * allow jailed root various debugging privileges.
3747 */
3748 case PRIV_DEBUG_DIFFCRED:
3749 case PRIV_DEBUG_SUGID:
3750 case PRIV_DEBUG_UNPRIV:
3751
3752 /*
3753 * Allow jail to set various resource limits and login
3754 * properties, and for now, exceed process resource limits.
3755 */
3756 case PRIV_PROC_LIMIT:
3757 case PRIV_PROC_SETLOGIN:
3758 case PRIV_PROC_SETRLIMIT:
3759
3760 /*
3761 * System V and POSIX IPC privileges are granted in jail.
3762 */
3763 case PRIV_IPC_READ:
3764 case PRIV_IPC_WRITE:
3765 case PRIV_IPC_ADMIN:
3766 case PRIV_IPC_MSGSIZE:
3767 case PRIV_MQ_ADMIN:
3768
3769 /*
3770 * Jail operations within a jail work on child jails.
3771 */
3772 case PRIV_JAIL_ATTACH:
3773 case PRIV_JAIL_SET:
3774 case PRIV_JAIL_REMOVE:
3775
3776 /*
3777 * Jail implements its own inter-process limits, so allow
3778 * root processes in jail to change scheduling on other
3779 * processes in the same jail. Likewise for signalling.
3780 */
3781 case PRIV_SCHED_DIFFCRED:
3782 case PRIV_SCHED_CPUSET:
3783 case PRIV_SIGNAL_DIFFCRED:
3784 case PRIV_SIGNAL_SUGID:
3785
3786 /*
3787 * Allow jailed processes to write to sysctls marked as jail
3788 * writable.
3789 */
3790 case PRIV_SYSCTL_WRITEJAIL:
3791
3792 /*
3793 * Allow root in jail to manage a variety of quota
3794 * properties. These should likely be conditional on a
3795 * configuration option.
3796 */
3797 case PRIV_VFS_GETQUOTA:
3798 case PRIV_VFS_SETQUOTA:
3799
3800 /*
3801 * Since Jail relies on chroot() to implement file system
3802 * protections, grant many VFS privileges to root in jail.
3803 * Be careful to exclude mount-related and NFS-related
3804 * privileges.
3805 */
3806 case PRIV_VFS_READ:
3807 case PRIV_VFS_WRITE:
3808 case PRIV_VFS_ADMIN:
3809 case PRIV_VFS_EXEC:
3810 case PRIV_VFS_LOOKUP:
3811 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
3812 case PRIV_VFS_CHFLAGS_DEV:
3813 case PRIV_VFS_CHOWN:
3814 case PRIV_VFS_CHROOT:
3815 case PRIV_VFS_RETAINSUGID:
3816 case PRIV_VFS_FCHROOT:
3817 case PRIV_VFS_LINK:
3818 case PRIV_VFS_SETGID:
3819 case PRIV_VFS_STAT:
3820 case PRIV_VFS_STICKYFILE:
3821 return (0);
3822
3823 /*
3824 * Depending on the global setting, allow privilege of
3825 * setting system flags.
3826 */
3827 case PRIV_VFS_SYSFLAGS:
3828 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
3829 return (0);
3830 else
3831 return (EPERM);
3832
3833 /*
3834 * Depending on the global setting, allow privilege of
3835 * mounting/unmounting file systems.
3836 */
3837 case PRIV_VFS_MOUNT:
3838 case PRIV_VFS_UNMOUNT:
3839 case PRIV_VFS_MOUNT_NONUSER:
3840 case PRIV_VFS_MOUNT_OWNER:
3841 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT)
3842 return (0);
3843 else
3844 return (EPERM);
3845
3846 /*
3847 * Allow jailed root to bind reserved ports and reuse in-use
3848 * ports.
3849 */
3850 case PRIV_NETINET_RESERVEDPORT:
3851 case PRIV_NETINET_REUSEPORT:
3852 return (0);
3853
3854 /*
3855 * Allow jailed root to set certian IPv4/6 (option) headers.
3856 */
3857 case PRIV_NETINET_SETHDROPTS:
3858 return (0);
3859
3860 /*
3861 * Conditionally allow creating raw sockets in jail.
3862 */
3863 case PRIV_NETINET_RAW:
3864 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
3865 return (0);
3866 else
3867 return (EPERM);
3868
3869 /*
3870 * Since jail implements its own visibility limits on netstat
3871 * sysctls, allow getcred. This allows identd to work in
3872 * jail.
3873 */
3874 case PRIV_NETINET_GETCRED:
3875 return (0);
3876
3877 /*
3878 * Allow jailed root to set loginclass.
3879 */
3880 case PRIV_PROC_SETLOGINCLASS:
3881 return (0);
3882
3883 default:
3884 /*
3885 * In all remaining cases, deny the privilege request. This
3886 * includes almost all network privileges, many system
3887 * configuration privileges.
3888 */
3889 return (EPERM);
3890 }
3891}
3892
3893/*
3894 * Return the part of pr2's name that is relative to pr1, or the whole name
3895 * if it does not directly follow.
3896 */
3897
3898char *
3899prison_name(struct prison *pr1, struct prison *pr2)
3900{
3901 char *name;
3902
3903 /* Jails see themselves as "0" (if they see themselves at all). */
3904 if (pr1 == pr2)
3905 return "0";
3906 name = pr2->pr_name;
3907 if (prison_ischild(pr1, pr2)) {
3908 /*
3909 * pr1 isn't locked (and allprison_lock may not be either)
3910 * so its length can't be counted on. But the number of dots
3911 * can be counted on - and counted.
3912 */
3913 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
3914 name = strchr(name, '.') + 1;
3915 }
3916 return (name);
3917}
3918
3919/*
3920 * Return the part of pr2's path that is relative to pr1, or the whole path
3921 * if it does not directly follow.
3922 */
3923static char *
3924prison_path(struct prison *pr1, struct prison *pr2)
3925{
3926 char *path1, *path2;
3927 int len1;
3928
3929 path1 = pr1->pr_path;
3930 path2 = pr2->pr_path;
3931 if (!strcmp(path1, "/"))
3932 return (path2);
3933 len1 = strlen(path1);
3934 if (strncmp(path1, path2, len1))
3935 return (path2);
3936 if (path2[len1] == '\0')
3937 return "/";
3938 if (path2[len1] == '/')
3939 return (path2 + len1);
3940 return (path2);
3941}
3942
3943
3944/*
3945 * Jail-related sysctls.
3946 */
3947SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
3948 "Jails");
3949
3950static int
3951sysctl_jail_list(SYSCTL_HANDLER_ARGS)
3952{
3953 struct xprison *xp;
3954 struct prison *pr, *cpr;
3955#ifdef INET
3956 struct in_addr *ip4 = NULL;
3957 int ip4s = 0;
3958#endif
3959#ifdef INET6
3960 struct in6_addr *ip6 = NULL;
3961 int ip6s = 0;
3962#endif
3963 int descend, error;
3964
3965 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
3966 pr = req->td->td_ucred->cr_prison;
3967 error = 0;
3968 sx_slock(&allprison_lock);
3969 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
3970#if defined(INET) || defined(INET6)
3971 again:
3972#endif
3973 mtx_lock(&cpr->pr_mtx);
3974#ifdef INET
3975 if (cpr->pr_ip4s > 0) {
3976 if (ip4s < cpr->pr_ip4s) {
3977 ip4s = cpr->pr_ip4s;
3978 mtx_unlock(&cpr->pr_mtx);
3979 ip4 = realloc(ip4, ip4s *
3980 sizeof(struct in_addr), M_TEMP, M_WAITOK);
3981 goto again;
3982 }
3983 bcopy(cpr->pr_ip4, ip4,
3984 cpr->pr_ip4s * sizeof(struct in_addr));
3985 }
3986#endif
3987#ifdef INET6
3988 if (cpr->pr_ip6s > 0) {
3989 if (ip6s < cpr->pr_ip6s) {
3990 ip6s = cpr->pr_ip6s;
3991 mtx_unlock(&cpr->pr_mtx);
3992 ip6 = realloc(ip6, ip6s *
3993 sizeof(struct in6_addr), M_TEMP, M_WAITOK);
3994 goto again;
3995 }
3996 bcopy(cpr->pr_ip6, ip6,
3997 cpr->pr_ip6s * sizeof(struct in6_addr));
3998 }
3999#endif
4000 if (cpr->pr_ref == 0) {
4001 mtx_unlock(&cpr->pr_mtx);
4002 continue;
4003 }
4004 bzero(xp, sizeof(*xp));
4005 xp->pr_version = XPRISON_VERSION;
4006 xp->pr_id = cpr->pr_id;
4007 xp->pr_state = cpr->pr_uref > 0
4008 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
4009 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
4010 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
4011 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
4012#ifdef INET
4013 xp->pr_ip4s = cpr->pr_ip4s;
4014#endif
4015#ifdef INET6
4016 xp->pr_ip6s = cpr->pr_ip6s;
4017#endif
4018 mtx_unlock(&cpr->pr_mtx);
4019 error = SYSCTL_OUT(req, xp, sizeof(*xp));
4020 if (error)
4021 break;
4022#ifdef INET
4023 if (xp->pr_ip4s > 0) {
4024 error = SYSCTL_OUT(req, ip4,
4025 xp->pr_ip4s * sizeof(struct in_addr));
4026 if (error)
4027 break;
4028 }
4029#endif
4030#ifdef INET6
4031 if (xp->pr_ip6s > 0) {
4032 error = SYSCTL_OUT(req, ip6,
4033 xp->pr_ip6s * sizeof(struct in6_addr));
4034 if (error)
4035 break;
4036 }
4037#endif
4038 }
4039 sx_sunlock(&allprison_lock);
4040 free(xp, M_TEMP);
4041#ifdef INET
4042 free(ip4, M_TEMP);
4043#endif
4044#ifdef INET6
4045 free(ip6, M_TEMP);
4046#endif
4047 return (error);
4048}
4049
4050SYSCTL_OID(_security_jail, OID_AUTO, list,
4051 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4052 sysctl_jail_list, "S", "List of active jails");
4053
4054static int
4055sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
4056{
4057 int error, injail;
4058
4059 injail = jailed(req->td->td_ucred);
4060 error = SYSCTL_OUT(req, &injail, sizeof(injail));
4061
4062 return (error);
4063}
4064
4065SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
4066 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4067 sysctl_jail_jailed, "I", "Process in jail?");
4068
4069#if defined(INET) || defined(INET6)
4070SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
4071 &jail_max_af_ips, 0,
4072 "Number of IP addresses a jail may have at most per address family");
4073#endif
4074
4075/*
4076 * Default parameters for jail(2) compatability. For historical reasons,
4077 * the sysctl names have varying similarity to the parameter names. Prisons
4078 * just see their own parameters, and can't change them.
4079 */
4080static int
4081sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
4082{
4083 struct prison *pr;
4084 int allow, error, i;
4085
4086 pr = req->td->td_ucred->cr_prison;
4087 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
4088
4089 /* Get the current flag value, and convert it to a boolean. */
4090 i = (allow & arg2) ? 1 : 0;
4091 if (arg1 != NULL)
4092 i = !i;
4093 error = sysctl_handle_int(oidp, &i, 0, req);
4094 if (error || !req->newptr)
4095 return (error);
4096 i = i ? arg2 : 0;
4097 if (arg1 != NULL)
4098 i ^= arg2;
4099 /*
4100 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
4101 * for writing.
4102 */
4103 mtx_lock(&prison0.pr_mtx);
4104 jail_default_allow = (jail_default_allow & ~arg2) | i;
4105 mtx_unlock(&prison0.pr_mtx);
4106 return (0);
4107}
4108
4109SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
4110 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4111 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
4112 "Processes in jail can set their hostnames");
4113SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
4114 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4115 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
4116 "Processes in jail are limited to creating UNIX/IP/route sockets only");
4117SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
4118 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4119 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
4120 "Processes in jail can use System V IPC primitives");
4121SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
4122 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4123 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
4124 "Prison root can create raw sockets");
4125SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
4126 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4127 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
4128 "Processes in jail can alter system file flags");
4129SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
4130 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4131 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
4132 "Processes in jail can mount/unmount jail-friendly file systems");
4133
4134static int
4135sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
4136{
4137 struct prison *pr;
4138 int level, error;
4139
4140 pr = req->td->td_ucred->cr_prison;
4141 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
4142 error = sysctl_handle_int(oidp, &level, 0, req);
4143 if (error || !req->newptr)
4144 return (error);
4145 *(int *)arg1 = level;
4146 return (0);
4147}
4148
4149SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
4150 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4151 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
4152 sysctl_jail_default_level, "I",
4153 "Processes in jail cannot see all mounted file systems");
4154
4155/*
4156 * Nodes to describe jail parameters. Maximum length of string parameters
4157 * is returned in the string itself, and the other parameters exist merely
4158 * to make themselves and their types known.
4159 */
4160SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0,
4161 "Jail parameters");
4162
4163int
4164sysctl_jail_param(SYSCTL_HANDLER_ARGS)
4165{
4166 int i;
4167 long l;
4168 size_t s;
4169 char numbuf[12];
4170
4171 switch (oidp->oid_kind & CTLTYPE)
4172 {
4173 case CTLTYPE_LONG:
4174 case CTLTYPE_ULONG:
4175 l = 0;
4176#ifdef SCTL_MASK32
4177 if (!(req->flags & SCTL_MASK32))
4178#endif
4179 return (SYSCTL_OUT(req, &l, sizeof(l)));
4180 case CTLTYPE_INT:
4181 case CTLTYPE_UINT:
4182 i = 0;
4183 return (SYSCTL_OUT(req, &i, sizeof(i)));
4184 case CTLTYPE_STRING:
4185 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
4186 return
4187 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
4188 case CTLTYPE_STRUCT:
4189 s = (size_t)arg2;
4190 return (SYSCTL_OUT(req, &s, sizeof(s)));
4191 }
4192 return (0);
4193}
4194
4195SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
4196SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
4197SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
4198SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
4199SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
4200 "I", "Jail secure level");
4201SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
4202 "I", "Jail cannot see all mounted file systems");
4203SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
4204 "B", "Jail persistence");
4205#ifdef VIMAGE
4206SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
4207 "E,jailsys", "Virtual network stack");
4208#endif
4209SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
4210 "B", "Jail is in the process of shutting down");
4211
4212SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
4213SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
4214 "I", "Current number of child jails");
4215SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
4216 "I", "Maximum number of child jails");
4217
4218SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
4219SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
4220 "Jail hostname");
4221SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
4222 "Jail NIS domainname");
4223SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
4224 "Jail host UUID");
4225SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
4226 "LU", "Jail host ID");
4227
4228SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
4229SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
4230
4231#ifdef INET
4232SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
4233 "Jail IPv4 address virtualization");
4234SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
4235 "S,in_addr,a", "Jail IPv4 addresses");
4236SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4237 "B", "Do (not) use IPv4 source address selection rather than the "
4238 "primary jail IPv4 address.");
4239#endif
4240#ifdef INET6
4241SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
4242 "Jail IPv6 address virtualization");
4243SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
4244 "S,in6_addr,a", "Jail IPv6 addresses");
4245SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4246 "B", "Do (not) use IPv6 source address selection rather than the "
4247 "primary jail IPv6 address.");
4248#endif
4249
4250SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
4251SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
4252 "B", "Jail may set hostname");
4253SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
4254 "B", "Jail may use SYSV IPC");
4255SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
4256 "B", "Jail may create raw sockets");
4257SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
4258 "B", "Jail may alter system file flags");
4259SYSCTL_JAIL_PARAM(_allow, mount, CTLTYPE_INT | CTLFLAG_RW,
4260 "B", "Jail may mount/unmount jail-friendly file systems");
4261SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
4262 "B", "Jail may set file quotas");
4263SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
4264 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
4265
4266
4267#ifdef DDB
4268
4269static void
4270db_show_prison(struct prison *pr)
4271{
4272 int fi;
4273#if defined(INET) || defined(INET6)
4274 int ii;
4275#endif
4276 unsigned jsf;
4277#ifdef INET6
4278 char ip6buf[INET6_ADDRSTRLEN];
4279#endif
4280
4281 db_printf("prison %p:\n", pr);
4282 db_printf(" jid = %d\n", pr->pr_id);
4283 db_printf(" name = %s\n", pr->pr_name);
4284 db_printf(" parent = %p\n", pr->pr_parent);
4285 db_printf(" ref = %d\n", pr->pr_ref);
4286 db_printf(" uref = %d\n", pr->pr_uref);
4287 db_printf(" path = %s\n", pr->pr_path);
4288 db_printf(" cpuset = %d\n", pr->pr_cpuset
4289 ? pr->pr_cpuset->cs_id : -1);
4290#ifdef VIMAGE
4291 db_printf(" vnet = %p\n", pr->pr_vnet);
4292#endif
4293 db_printf(" root = %p\n", pr->pr_root);
4294 db_printf(" securelevel = %d\n", pr->pr_securelevel);
4295 db_printf(" children.max = %d\n", pr->pr_childmax);
4296 db_printf(" children.cur = %d\n", pr->pr_childcount);
4297 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
4298 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
4299 db_printf(" flags = 0x%x", pr->pr_flags);
4300 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
4301 fi++)
4302 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi)))
4303 db_printf(" %s", pr_flag_names[fi]);
4304 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
4305 fi++) {
4306 jsf = pr->pr_flags &
4307 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
4308 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name,
4309 pr_flag_jailsys[fi].disable &&
4310 (jsf == pr_flag_jailsys[fi].disable) ? "disable"
4311 : (jsf == pr_flag_jailsys[fi].new) ? "new"
4312 : "inherit");
4313 }
4314 db_printf(" allow = 0x%x", pr->pr_allow);
4315 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
4316 fi++)
4317 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi)))
4318 db_printf(" %s", pr_allow_names[fi]);
4319 db_printf("\n");
4320 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
4321 db_printf(" host.hostname = %s\n", pr->pr_hostname);
4322 db_printf(" host.domainname = %s\n", pr->pr_domainname);
4323 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
4324 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
4325#ifdef INET
4326 db_printf(" ip4s = %d\n", pr->pr_ip4s);
4327 for (ii = 0; ii < pr->pr_ip4s; ii++)
4328 db_printf(" %s %s\n",
4329 ii == 0 ? "ip4.addr =" : " ",
4330 inet_ntoa(pr->pr_ip4[ii]));
4331#endif
4332#ifdef INET6
4333 db_printf(" ip6s = %d\n", pr->pr_ip6s);
4334 for (ii = 0; ii < pr->pr_ip6s; ii++)
4335 db_printf(" %s %s\n",
4336 ii == 0 ? "ip6.addr =" : " ",
4337 ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
4338#endif
4339}
4340
4341DB_SHOW_COMMAND(prison, db_show_prison_command)
4342{
4343 struct prison *pr;
4344
4345 if (!have_addr) {
4346 /*
4347 * Show all prisons in the list, and prison0 which is not
4348 * listed.
4349 */
4350 db_show_prison(&prison0);
4351 if (!db_pager_quit) {
4352 TAILQ_FOREACH(pr, &allprison, pr_list) {
4353 db_show_prison(pr);
4354 if (db_pager_quit)
4355 break;
4356 }
4357 }
4358 return;
4359 }
4360
4361 if (addr == 0)
4362 pr = &prison0;
4363 else {
4364 /* Look for a prison with the ID and with references. */
4365 TAILQ_FOREACH(pr, &allprison, pr_list)
4366 if (pr->pr_id == addr && pr->pr_ref > 0)
4367 break;
4368 if (pr == NULL)
4369 /* Look again, without requiring a reference. */
4370 TAILQ_FOREACH(pr, &allprison, pr_list)
4371 if (pr->pr_id == addr)
4372 break;
4373 if (pr == NULL)
4374 /* Assume address points to a valid prison. */
4375 pr = (struct prison *)addr;
4376 }
4377 db_show_prison(pr);
4378}
4379
4380#endif /* DDB */