FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_jail.c
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: releng/9.2/sys/kern/kern_jail.c 250915 2013-05-22 18:26:12Z jamie $");
31
32 #include "opt_compat.h"
33 #include "opt_ddb.h"
34 #include "opt_inet.h"
35 #include "opt_inet6.h"
36
37 #include <sys/param.h>
38 #include <sys/types.h>
39 #include <sys/kernel.h>
40 #include <sys/systm.h>
41 #include <sys/errno.h>
42 #include <sys/sysproto.h>
43 #include <sys/malloc.h>
44 #include <sys/osd.h>
45 #include <sys/priv.h>
46 #include <sys/proc.h>
47 #include <sys/taskqueue.h>
48 #include <sys/fcntl.h>
49 #include <sys/jail.h>
50 #include <sys/lock.h>
51 #include <sys/mutex.h>
52 #include <sys/racct.h>
53 #include <sys/refcount.h>
54 #include <sys/sx.h>
55 #include <sys/sysent.h>
56 #include <sys/namei.h>
57 #include <sys/mount.h>
58 #include <sys/queue.h>
59 #include <sys/socket.h>
60 #include <sys/syscallsubr.h>
61 #include <sys/sysctl.h>
62 #include <sys/vnode.h>
63
64 #include <net/if.h>
65 #include <net/vnet.h>
66
67 #include <netinet/in.h>
68
69 #ifdef DDB
70 #include <ddb/ddb.h>
71 #ifdef INET6
72 #include <netinet6/in6_var.h>
73 #endif /* INET6 */
74 #endif /* DDB */
75
76 #include <security/mac/mac_framework.h>
77
78 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000"
79
80 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
81 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures");
82
83 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */
84 #ifdef INET
85 #ifdef INET6
86 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
87 #else
88 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
89 #endif
90 #else /* !INET */
91 #ifdef INET6
92 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
93 #else
94 #define _PR_IP_SADDRSEL 0
95 #endif
96 #endif
97
98 /* prison0 describes what is "real" about the system. */
99 struct prison prison0 = {
100 .pr_id = 0,
101 .pr_name = "",
102 .pr_ref = 1,
103 .pr_uref = 1,
104 .pr_path = "/",
105 .pr_securelevel = -1,
106 .pr_devfs_rsnum = 0,
107 .pr_childmax = JAIL_MAX,
108 .pr_hostuuid = DEFAULT_HOSTUUID,
109 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
110 #ifdef VIMAGE
111 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
112 #else
113 .pr_flags = PR_HOST|_PR_IP_SADDRSEL,
114 #endif
115 .pr_allow = PR_ALLOW_ALL,
116 };
117 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
118
119 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */
120 struct sx allprison_lock;
121 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
122 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
123 LIST_HEAD(, prison_racct) allprison_racct;
124 int lastprid = 0;
125
126 static int do_jail_attach(struct thread *td, struct prison *pr);
127 static void prison_complete(void *context, int pending);
128 static void prison_deref(struct prison *pr, int flags);
129 static char *prison_path(struct prison *pr1, struct prison *pr2);
130 static void prison_remove_one(struct prison *pr);
131 #ifdef RACCT
132 static void prison_racct_attach(struct prison *pr);
133 static void prison_racct_modify(struct prison *pr);
134 static void prison_racct_detach(struct prison *pr);
135 #endif
136 #ifdef INET
137 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia);
138 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4);
139 #endif
140 #ifdef INET6
141 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6);
142 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6);
143 #endif
144
145 /* Flags for prison_deref */
146 #define PD_DEREF 0x01
147 #define PD_DEUREF 0x02
148 #define PD_LOCKED 0x04
149 #define PD_LIST_SLOCKED 0x08
150 #define PD_LIST_XLOCKED 0x10
151
152 /*
153 * Parameter names corresponding to PR_* flag values. Size values are for kvm
154 * as we cannot figure out the size of a sparse array, or an array without a
155 * terminating entry.
156 */
157 static char *pr_flag_names[] = {
158 [0] = "persist",
159 #ifdef INET
160 [7] = "ip4.saddrsel",
161 #endif
162 #ifdef INET6
163 [8] = "ip6.saddrsel",
164 #endif
165 };
166 const size_t pr_flag_names_size = sizeof(pr_flag_names);
167
168 static char *pr_flag_nonames[] = {
169 [0] = "nopersist",
170 #ifdef INET
171 [7] = "ip4.nosaddrsel",
172 #endif
173 #ifdef INET6
174 [8] = "ip6.nosaddrsel",
175 #endif
176 };
177 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames);
178
179 struct jailsys_flags {
180 const char *name;
181 unsigned disable;
182 unsigned new;
183 } pr_flag_jailsys[] = {
184 { "host", 0, PR_HOST },
185 #ifdef VIMAGE
186 { "vnet", 0, PR_VNET },
187 #endif
188 #ifdef INET
189 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER },
190 #endif
191 #ifdef INET6
192 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER },
193 #endif
194 };
195 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
196
197 static char *pr_allow_names[] = {
198 "allow.set_hostname",
199 "allow.sysvipc",
200 "allow.raw_sockets",
201 "allow.chflags",
202 "allow.mount",
203 "allow.quotas",
204 "allow.socket_af",
205 "allow.mount.devfs",
206 "allow.mount.nullfs",
207 "allow.mount.zfs",
208 "allow.mount.procfs",
209 };
210 const size_t pr_allow_names_size = sizeof(pr_allow_names);
211
212 static char *pr_allow_nonames[] = {
213 "allow.noset_hostname",
214 "allow.nosysvipc",
215 "allow.noraw_sockets",
216 "allow.nochflags",
217 "allow.nomount",
218 "allow.noquotas",
219 "allow.nosocket_af",
220 "allow.mount.nodevfs",
221 "allow.mount.nonullfs",
222 "allow.mount.nozfs",
223 "allow.mount.noprocfs",
224 };
225 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames);
226
227 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME
228 #define JAIL_DEFAULT_ENFORCE_STATFS 2
229 #define JAIL_DEFAULT_DEVFS_RSNUM 0
230 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
231 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
232 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
233 #if defined(INET) || defined(INET6)
234 static unsigned jail_max_af_ips = 255;
235 #endif
236
237 #ifdef INET
238 static int
239 qcmp_v4(const void *ip1, const void *ip2)
240 {
241 in_addr_t iaa, iab;
242
243 /*
244 * We need to compare in HBO here to get the list sorted as expected
245 * by the result of the code. Sorting NBO addresses gives you
246 * interesting results. If you do not understand, do not try.
247 */
248 iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
249 iab = ntohl(((const struct in_addr *)ip2)->s_addr);
250
251 /*
252 * Do not simply return the difference of the two numbers, the int is
253 * not wide enough.
254 */
255 if (iaa > iab)
256 return (1);
257 else if (iaa < iab)
258 return (-1);
259 else
260 return (0);
261 }
262 #endif
263
264 #ifdef INET6
265 static int
266 qcmp_v6(const void *ip1, const void *ip2)
267 {
268 const struct in6_addr *ia6a, *ia6b;
269 int i, rc;
270
271 ia6a = (const struct in6_addr *)ip1;
272 ia6b = (const struct in6_addr *)ip2;
273
274 rc = 0;
275 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
276 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
277 rc = 1;
278 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
279 rc = -1;
280 }
281 return (rc);
282 }
283 #endif
284
285 /*
286 * struct jail_args {
287 * struct jail *jail;
288 * };
289 */
290 int
291 sys_jail(struct thread *td, struct jail_args *uap)
292 {
293 uint32_t version;
294 int error;
295 struct jail j;
296
297 error = copyin(uap->jail, &version, sizeof(uint32_t));
298 if (error)
299 return (error);
300
301 switch (version) {
302 case 0:
303 {
304 struct jail_v0 j0;
305
306 /* FreeBSD single IPv4 jails. */
307 bzero(&j, sizeof(struct jail));
308 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
309 if (error)
310 return (error);
311 j.version = j0.version;
312 j.path = j0.path;
313 j.hostname = j0.hostname;
314 j.ip4s = j0.ip_number;
315 break;
316 }
317
318 case 1:
319 /*
320 * Version 1 was used by multi-IPv4 jail implementations
321 * that never made it into the official kernel.
322 */
323 return (EINVAL);
324
325 case 2: /* JAIL_API_VERSION */
326 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
327 error = copyin(uap->jail, &j, sizeof(struct jail));
328 if (error)
329 return (error);
330 break;
331
332 default:
333 /* Sci-Fi jails are not supported, sorry. */
334 return (EINVAL);
335 }
336 return (kern_jail(td, &j));
337 }
338
339 int
340 kern_jail(struct thread *td, struct jail *j)
341 {
342 struct iovec optiov[2 * (4
343 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0])
344 #ifdef INET
345 + 1
346 #endif
347 #ifdef INET6
348 + 1
349 #endif
350 )];
351 struct uio opt;
352 char *u_path, *u_hostname, *u_name;
353 #ifdef INET
354 uint32_t ip4s;
355 struct in_addr *u_ip4;
356 #endif
357 #ifdef INET6
358 struct in6_addr *u_ip6;
359 #endif
360 size_t tmplen;
361 int error, enforce_statfs, fi;
362
363 bzero(&optiov, sizeof(optiov));
364 opt.uio_iov = optiov;
365 opt.uio_iovcnt = 0;
366 opt.uio_offset = -1;
367 opt.uio_resid = -1;
368 opt.uio_segflg = UIO_SYSSPACE;
369 opt.uio_rw = UIO_READ;
370 opt.uio_td = td;
371
372 /* Set permissions for top-level jails from sysctls. */
373 if (!jailed(td->td_ucred)) {
374 for (fi = 0; fi < sizeof(pr_allow_names) /
375 sizeof(pr_allow_names[0]); fi++) {
376 optiov[opt.uio_iovcnt].iov_base =
377 (jail_default_allow & (1 << fi))
378 ? pr_allow_names[fi] : pr_allow_nonames[fi];
379 optiov[opt.uio_iovcnt].iov_len =
380 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
381 opt.uio_iovcnt += 2;
382 }
383 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
384 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
385 opt.uio_iovcnt++;
386 enforce_statfs = jail_default_enforce_statfs;
387 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
388 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
389 opt.uio_iovcnt++;
390 }
391
392 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
393 #ifdef INET
394 ip4s = (j->version == 0) ? 1 : j->ip4s;
395 if (ip4s > jail_max_af_ips)
396 return (EINVAL);
397 tmplen += ip4s * sizeof(struct in_addr);
398 #else
399 if (j->ip4s > 0)
400 return (EINVAL);
401 #endif
402 #ifdef INET6
403 if (j->ip6s > jail_max_af_ips)
404 return (EINVAL);
405 tmplen += j->ip6s * sizeof(struct in6_addr);
406 #else
407 if (j->ip6s > 0)
408 return (EINVAL);
409 #endif
410 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
411 u_hostname = u_path + MAXPATHLEN;
412 u_name = u_hostname + MAXHOSTNAMELEN;
413 #ifdef INET
414 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
415 #endif
416 #ifdef INET6
417 #ifdef INET
418 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
419 #else
420 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
421 #endif
422 #endif
423 optiov[opt.uio_iovcnt].iov_base = "path";
424 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
425 opt.uio_iovcnt++;
426 optiov[opt.uio_iovcnt].iov_base = u_path;
427 error = copyinstr(j->path, u_path, MAXPATHLEN,
428 &optiov[opt.uio_iovcnt].iov_len);
429 if (error) {
430 free(u_path, M_TEMP);
431 return (error);
432 }
433 opt.uio_iovcnt++;
434 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
435 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
436 opt.uio_iovcnt++;
437 optiov[opt.uio_iovcnt].iov_base = u_hostname;
438 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
439 &optiov[opt.uio_iovcnt].iov_len);
440 if (error) {
441 free(u_path, M_TEMP);
442 return (error);
443 }
444 opt.uio_iovcnt++;
445 if (j->jailname != NULL) {
446 optiov[opt.uio_iovcnt].iov_base = "name";
447 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
448 opt.uio_iovcnt++;
449 optiov[opt.uio_iovcnt].iov_base = u_name;
450 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
451 &optiov[opt.uio_iovcnt].iov_len);
452 if (error) {
453 free(u_path, M_TEMP);
454 return (error);
455 }
456 opt.uio_iovcnt++;
457 }
458 #ifdef INET
459 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
460 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
461 opt.uio_iovcnt++;
462 optiov[opt.uio_iovcnt].iov_base = u_ip4;
463 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
464 if (j->version == 0)
465 u_ip4->s_addr = j->ip4s;
466 else {
467 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
468 if (error) {
469 free(u_path, M_TEMP);
470 return (error);
471 }
472 }
473 opt.uio_iovcnt++;
474 #endif
475 #ifdef INET6
476 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
477 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
478 opt.uio_iovcnt++;
479 optiov[opt.uio_iovcnt].iov_base = u_ip6;
480 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
481 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
482 if (error) {
483 free(u_path, M_TEMP);
484 return (error);
485 }
486 opt.uio_iovcnt++;
487 #endif
488 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]),
489 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
490 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
491 free(u_path, M_TEMP);
492 return (error);
493 }
494
495
496 /*
497 * struct jail_set_args {
498 * struct iovec *iovp;
499 * unsigned int iovcnt;
500 * int flags;
501 * };
502 */
503 int
504 sys_jail_set(struct thread *td, struct jail_set_args *uap)
505 {
506 struct uio *auio;
507 int error;
508
509 /* Check that we have an even number of iovecs. */
510 if (uap->iovcnt & 1)
511 return (EINVAL);
512
513 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
514 if (error)
515 return (error);
516 error = kern_jail_set(td, auio, uap->flags);
517 free(auio, M_IOV);
518 return (error);
519 }
520
521 int
522 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
523 {
524 struct nameidata nd;
525 #ifdef INET
526 struct in_addr *ip4;
527 #endif
528 #ifdef INET6
529 struct in6_addr *ip6;
530 #endif
531 struct vfsopt *opt;
532 struct vfsoptlist *opts;
533 struct prison *pr, *deadpr, *mypr, *ppr, *tpr;
534 struct vnode *root;
535 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
536 char *g_path;
537 #if defined(INET) || defined(INET6)
538 struct prison *tppr;
539 void *op;
540 #endif
541 unsigned long hid;
542 size_t namelen, onamelen;
543 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos;
544 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
545 int fi, jid, jsys, len, level;
546 int childmax, rsnum, slevel, vfslocked;
547 int fullpath_disabled;
548 #if defined(INET) || defined(INET6)
549 int ii, ij;
550 #endif
551 #ifdef INET
552 int ip4s, redo_ip4;
553 #endif
554 #ifdef INET6
555 int ip6s, redo_ip6;
556 #endif
557 uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
558 unsigned tallow;
559 char numbuf[12];
560
561 error = priv_check(td, PRIV_JAIL_SET);
562 if (!error && (flags & JAIL_ATTACH))
563 error = priv_check(td, PRIV_JAIL_ATTACH);
564 if (error)
565 return (error);
566 mypr = ppr = td->td_ucred->cr_prison;
567 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
568 return (EPERM);
569 if (flags & ~JAIL_SET_MASK)
570 return (EINVAL);
571
572 /*
573 * Check all the parameters before committing to anything. Not all
574 * errors can be caught early, but we may as well try. Also, this
575 * takes care of some expensive stuff (path lookup) before getting
576 * the allprison lock.
577 *
578 * XXX Jails are not filesystems, and jail parameters are not mount
579 * options. But it makes more sense to re-use the vfsopt code
580 * than duplicate it under a different name.
581 */
582 error = vfs_buildopts(optuio, &opts);
583 if (error)
584 return (error);
585 #ifdef INET
586 ip4 = NULL;
587 #endif
588 #ifdef INET6
589 ip6 = NULL;
590 #endif
591 g_path = NULL;
592
593 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
594 if (error == ENOENT)
595 jid = 0;
596 else if (error != 0)
597 goto done_free;
598
599 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
600 if (error == ENOENT)
601 gotslevel = 0;
602 else if (error != 0)
603 goto done_free;
604 else
605 gotslevel = 1;
606
607 error =
608 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
609 if (error == ENOENT)
610 gotchildmax = 0;
611 else if (error != 0)
612 goto done_free;
613 else
614 gotchildmax = 1;
615
616 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
617 if (error == ENOENT)
618 gotenforce = 0;
619 else if (error != 0)
620 goto done_free;
621 else if (enforce < 0 || enforce > 2) {
622 error = EINVAL;
623 goto done_free;
624 } else
625 gotenforce = 1;
626
627 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
628 if (error == ENOENT)
629 gotrsnum = 0;
630 else if (error != 0)
631 goto done_free;
632 else
633 gotrsnum = 1;
634
635 pr_flags = ch_flags = 0;
636 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
637 fi++) {
638 if (pr_flag_names[fi] == NULL)
639 continue;
640 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi);
641 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi);
642 }
643 ch_flags |= pr_flags;
644 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
645 fi++) {
646 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys,
647 sizeof(jsys));
648 if (error == ENOENT)
649 continue;
650 if (error != 0)
651 goto done_free;
652 switch (jsys) {
653 case JAIL_SYS_DISABLE:
654 if (!pr_flag_jailsys[fi].disable) {
655 error = EINVAL;
656 goto done_free;
657 }
658 pr_flags |= pr_flag_jailsys[fi].disable;
659 break;
660 case JAIL_SYS_NEW:
661 pr_flags |= pr_flag_jailsys[fi].new;
662 break;
663 case JAIL_SYS_INHERIT:
664 break;
665 default:
666 error = EINVAL;
667 goto done_free;
668 }
669 ch_flags |=
670 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable;
671 }
672 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE
673 && !(pr_flags & PR_PERSIST)) {
674 error = EINVAL;
675 vfs_opterror(opts, "new jail must persist or attach");
676 goto done_errmsg;
677 }
678 #ifdef VIMAGE
679 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
680 error = EINVAL;
681 vfs_opterror(opts, "vnet cannot be changed after creation");
682 goto done_errmsg;
683 }
684 #endif
685 #ifdef INET
686 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
687 error = EINVAL;
688 vfs_opterror(opts, "ip4 cannot be changed after creation");
689 goto done_errmsg;
690 }
691 #endif
692 #ifdef INET6
693 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
694 error = EINVAL;
695 vfs_opterror(opts, "ip6 cannot be changed after creation");
696 goto done_errmsg;
697 }
698 #endif
699
700 pr_allow = ch_allow = 0;
701 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
702 fi++) {
703 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi);
704 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi);
705 }
706 ch_allow |= pr_allow;
707
708 error = vfs_getopt(opts, "name", (void **)&name, &len);
709 if (error == ENOENT)
710 name = NULL;
711 else if (error != 0)
712 goto done_free;
713 else {
714 if (len == 0 || name[len - 1] != '\0') {
715 error = EINVAL;
716 goto done_free;
717 }
718 if (len > MAXHOSTNAMELEN) {
719 error = ENAMETOOLONG;
720 goto done_free;
721 }
722 }
723
724 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
725 if (error == ENOENT)
726 host = NULL;
727 else if (error != 0)
728 goto done_free;
729 else {
730 ch_flags |= PR_HOST;
731 pr_flags |= PR_HOST;
732 if (len == 0 || host[len - 1] != '\0') {
733 error = EINVAL;
734 goto done_free;
735 }
736 if (len > MAXHOSTNAMELEN) {
737 error = ENAMETOOLONG;
738 goto done_free;
739 }
740 }
741
742 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
743 if (error == ENOENT)
744 domain = NULL;
745 else if (error != 0)
746 goto done_free;
747 else {
748 ch_flags |= PR_HOST;
749 pr_flags |= PR_HOST;
750 if (len == 0 || domain[len - 1] != '\0') {
751 error = EINVAL;
752 goto done_free;
753 }
754 if (len > MAXHOSTNAMELEN) {
755 error = ENAMETOOLONG;
756 goto done_free;
757 }
758 }
759
760 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
761 if (error == ENOENT)
762 uuid = NULL;
763 else if (error != 0)
764 goto done_free;
765 else {
766 ch_flags |= PR_HOST;
767 pr_flags |= PR_HOST;
768 if (len == 0 || uuid[len - 1] != '\0') {
769 error = EINVAL;
770 goto done_free;
771 }
772 if (len > HOSTUUIDLEN) {
773 error = ENAMETOOLONG;
774 goto done_free;
775 }
776 }
777
778 #ifdef COMPAT_FREEBSD32
779 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
780 uint32_t hid32;
781
782 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
783 hid = hid32;
784 } else
785 #endif
786 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
787 if (error == ENOENT)
788 gothid = 0;
789 else if (error != 0)
790 goto done_free;
791 else {
792 gothid = 1;
793 ch_flags |= PR_HOST;
794 pr_flags |= PR_HOST;
795 }
796
797 #ifdef INET
798 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
799 if (error == ENOENT)
800 ip4s = (pr_flags & PR_IP4_DISABLE) ? 0 : -1;
801 else if (error != 0)
802 goto done_free;
803 else if (ip4s & (sizeof(*ip4) - 1)) {
804 error = EINVAL;
805 goto done_free;
806 } else {
807 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE;
808 if (ip4s == 0)
809 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE;
810 else {
811 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER;
812 ip4s /= sizeof(*ip4);
813 if (ip4s > jail_max_af_ips) {
814 error = EINVAL;
815 vfs_opterror(opts, "too many IPv4 addresses");
816 goto done_errmsg;
817 }
818 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
819 bcopy(op, ip4, ip4s * sizeof(*ip4));
820 /*
821 * IP addresses are all sorted but ip[0] to preserve
822 * the primary IP address as given from userland.
823 * This special IP is used for unbound outgoing
824 * connections as well for "loopback" traffic in case
825 * source address selection cannot find any more fitting
826 * address to connect from.
827 */
828 if (ip4s > 1)
829 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4);
830 /*
831 * Check for duplicate addresses and do some simple
832 * zero and broadcast checks. If users give other bogus
833 * addresses it is their problem.
834 *
835 * We do not have to care about byte order for these
836 * checks so we will do them in NBO.
837 */
838 for (ii = 0; ii < ip4s; ii++) {
839 if (ip4[ii].s_addr == INADDR_ANY ||
840 ip4[ii].s_addr == INADDR_BROADCAST) {
841 error = EINVAL;
842 goto done_free;
843 }
844 if ((ii+1) < ip4s &&
845 (ip4[0].s_addr == ip4[ii+1].s_addr ||
846 ip4[ii].s_addr == ip4[ii+1].s_addr)) {
847 error = EINVAL;
848 goto done_free;
849 }
850 }
851 }
852 }
853 #endif
854
855 #ifdef INET6
856 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
857 if (error == ENOENT)
858 ip6s = (pr_flags & PR_IP6_DISABLE) ? 0 : -1;
859 else if (error != 0)
860 goto done_free;
861 else if (ip6s & (sizeof(*ip6) - 1)) {
862 error = EINVAL;
863 goto done_free;
864 } else {
865 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE;
866 if (ip6s == 0)
867 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE;
868 else {
869 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER;
870 ip6s /= sizeof(*ip6);
871 if (ip6s > jail_max_af_ips) {
872 error = EINVAL;
873 vfs_opterror(opts, "too many IPv6 addresses");
874 goto done_errmsg;
875 }
876 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
877 bcopy(op, ip6, ip6s * sizeof(*ip6));
878 if (ip6s > 1)
879 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6);
880 for (ii = 0; ii < ip6s; ii++) {
881 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
882 error = EINVAL;
883 goto done_free;
884 }
885 if ((ii+1) < ip6s &&
886 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
887 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
888 {
889 error = EINVAL;
890 goto done_free;
891 }
892 }
893 }
894 }
895 #endif
896
897 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
898 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
899 error = EINVAL;
900 vfs_opterror(opts,
901 "vnet jails cannot have IP address restrictions");
902 goto done_errmsg;
903 }
904 #endif
905
906 fullpath_disabled = 0;
907 root = NULL;
908 error = vfs_getopt(opts, "path", (void **)&path, &len);
909 if (error == ENOENT)
910 path = NULL;
911 else if (error != 0)
912 goto done_free;
913 else {
914 if (flags & JAIL_UPDATE) {
915 error = EINVAL;
916 vfs_opterror(opts,
917 "path cannot be changed after creation");
918 goto done_errmsg;
919 }
920 if (len == 0 || path[len - 1] != '\0') {
921 error = EINVAL;
922 goto done_free;
923 }
924 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE, UIO_SYSSPACE,
925 path, td);
926 error = namei(&nd);
927 if (error)
928 goto done_free;
929 vfslocked = NDHASGIANT(&nd);
930 root = nd.ni_vp;
931 NDFREE(&nd, NDF_ONLY_PNBUF);
932 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
933 strlcpy(g_path, path, MAXPATHLEN);
934 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
935 if (error == 0)
936 path = g_path;
937 else if (error == ENODEV) {
938 /* proceed if sysctl debug.disablefullpath == 1 */
939 fullpath_disabled = 1;
940 if (len < 2 || (len == 2 && path[0] == '/'))
941 path = NULL;
942 } else {
943 /* exit on other errors */
944 VFS_UNLOCK_GIANT(vfslocked);
945 goto done_free;
946 }
947 if (root->v_type != VDIR) {
948 error = ENOTDIR;
949 vput(root);
950 VFS_UNLOCK_GIANT(vfslocked);
951 goto done_free;
952 }
953 VOP_UNLOCK(root, 0);
954 VFS_UNLOCK_GIANT(vfslocked);
955 if (fullpath_disabled) {
956 /* Leave room for a real-root full pathname. */
957 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/")
958 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) {
959 error = ENAMETOOLONG;
960 goto done_free;
961 }
962 }
963 }
964
965 /*
966 * Grab the allprison lock before letting modules check their
967 * parameters. Once we have it, do not let go so we'll have a
968 * consistent view of the OSD list.
969 */
970 sx_xlock(&allprison_lock);
971 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts);
972 if (error)
973 goto done_unlock_list;
974
975 /* By now, all parameters should have been noted. */
976 TAILQ_FOREACH(opt, opts, link) {
977 if (!opt->seen && strcmp(opt->name, "errmsg")) {
978 error = EINVAL;
979 vfs_opterror(opts, "unknown parameter: %s", opt->name);
980 goto done_unlock_list;
981 }
982 }
983
984 /*
985 * See if we are creating a new record or updating an existing one.
986 * This abuses the file error codes ENOENT and EEXIST.
987 */
988 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
989 if (!cuflags) {
990 error = EINVAL;
991 vfs_opterror(opts, "no valid operation (create or update)");
992 goto done_unlock_list;
993 }
994 pr = NULL;
995 namelc = NULL;
996 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
997 namelc = strrchr(name, '.');
998 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
999 if (*p != '\0')
1000 jid = 0;
1001 }
1002 if (jid != 0) {
1003 /*
1004 * See if a requested jid already exists. There is an
1005 * information leak here if the jid exists but is not within
1006 * the caller's jail hierarchy. Jail creators will get EEXIST
1007 * even though they cannot see the jail, and CREATE | UPDATE
1008 * will return ENOENT which is not normally a valid error.
1009 */
1010 if (jid < 0) {
1011 error = EINVAL;
1012 vfs_opterror(opts, "negative jid");
1013 goto done_unlock_list;
1014 }
1015 pr = prison_find(jid);
1016 if (pr != NULL) {
1017 ppr = pr->pr_parent;
1018 /* Create: jid must not exist. */
1019 if (cuflags == JAIL_CREATE) {
1020 mtx_unlock(&pr->pr_mtx);
1021 error = EEXIST;
1022 vfs_opterror(opts, "jail %d already exists",
1023 jid);
1024 goto done_unlock_list;
1025 }
1026 if (!prison_ischild(mypr, pr)) {
1027 mtx_unlock(&pr->pr_mtx);
1028 pr = NULL;
1029 } else if (pr->pr_uref == 0) {
1030 if (!(flags & JAIL_DYING)) {
1031 mtx_unlock(&pr->pr_mtx);
1032 error = ENOENT;
1033 vfs_opterror(opts, "jail %d is dying",
1034 jid);
1035 goto done_unlock_list;
1036 } else if ((flags & JAIL_ATTACH) ||
1037 (pr_flags & PR_PERSIST)) {
1038 /*
1039 * A dying jail might be resurrected
1040 * (via attach or persist), but first
1041 * it must determine if another jail
1042 * has claimed its name. Accomplish
1043 * this by implicitly re-setting the
1044 * name.
1045 */
1046 if (name == NULL)
1047 name = prison_name(mypr, pr);
1048 }
1049 }
1050 }
1051 if (pr == NULL) {
1052 /* Update: jid must exist. */
1053 if (cuflags == JAIL_UPDATE) {
1054 error = ENOENT;
1055 vfs_opterror(opts, "jail %d not found", jid);
1056 goto done_unlock_list;
1057 }
1058 }
1059 }
1060 /*
1061 * If the caller provided a name, look for a jail by that name.
1062 * This has different semantics for creates and updates keyed by jid
1063 * (where the name must not already exist in a different jail),
1064 * and updates keyed by the name itself (where the name must exist
1065 * because that is the jail being updated).
1066 */
1067 if (name != NULL) {
1068 namelc = strrchr(name, '.');
1069 if (namelc == NULL)
1070 namelc = name;
1071 else {
1072 /*
1073 * This is a hierarchical name. Split it into the
1074 * parent and child names, and make sure the parent
1075 * exists or matches an already found jail.
1076 */
1077 *namelc = '\0';
1078 if (pr != NULL) {
1079 if (strncmp(name, ppr->pr_name, namelc - name)
1080 || ppr->pr_name[namelc - name] != '\0') {
1081 mtx_unlock(&pr->pr_mtx);
1082 error = EINVAL;
1083 vfs_opterror(opts,
1084 "cannot change jail's parent");
1085 goto done_unlock_list;
1086 }
1087 } else {
1088 ppr = prison_find_name(mypr, name);
1089 if (ppr == NULL) {
1090 error = ENOENT;
1091 vfs_opterror(opts,
1092 "jail \"%s\" not found", name);
1093 goto done_unlock_list;
1094 }
1095 mtx_unlock(&ppr->pr_mtx);
1096 }
1097 name = ++namelc;
1098 }
1099 if (name[0] != '\0') {
1100 namelen =
1101 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1102 name_again:
1103 deadpr = NULL;
1104 FOREACH_PRISON_CHILD(ppr, tpr) {
1105 if (tpr != pr && tpr->pr_ref > 0 &&
1106 !strcmp(tpr->pr_name + namelen, name)) {
1107 if (pr == NULL &&
1108 cuflags != JAIL_CREATE) {
1109 mtx_lock(&tpr->pr_mtx);
1110 if (tpr->pr_ref > 0) {
1111 /*
1112 * Use this jail
1113 * for updates.
1114 */
1115 if (tpr->pr_uref > 0) {
1116 pr = tpr;
1117 break;
1118 }
1119 deadpr = tpr;
1120 }
1121 mtx_unlock(&tpr->pr_mtx);
1122 } else if (tpr->pr_uref > 0) {
1123 /*
1124 * Create, or update(jid):
1125 * name must not exist in an
1126 * active sibling jail.
1127 */
1128 error = EEXIST;
1129 if (pr != NULL)
1130 mtx_unlock(&pr->pr_mtx);
1131 vfs_opterror(opts,
1132 "jail \"%s\" already exists",
1133 name);
1134 goto done_unlock_list;
1135 }
1136 }
1137 }
1138 /* If no active jail is found, use a dying one. */
1139 if (deadpr != NULL && pr == NULL) {
1140 if (flags & JAIL_DYING) {
1141 mtx_lock(&deadpr->pr_mtx);
1142 if (deadpr->pr_ref == 0) {
1143 mtx_unlock(&deadpr->pr_mtx);
1144 goto name_again;
1145 }
1146 pr = deadpr;
1147 } else if (cuflags == JAIL_UPDATE) {
1148 error = ENOENT;
1149 vfs_opterror(opts,
1150 "jail \"%s\" is dying", name);
1151 goto done_unlock_list;
1152 }
1153 }
1154 /* Update: name must exist if no jid. */
1155 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1156 error = ENOENT;
1157 vfs_opterror(opts, "jail \"%s\" not found",
1158 name);
1159 goto done_unlock_list;
1160 }
1161 }
1162 }
1163 /* Update: must provide a jid or name. */
1164 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1165 error = ENOENT;
1166 vfs_opterror(opts, "update specified no jail");
1167 goto done_unlock_list;
1168 }
1169
1170 /* If there's no prison to update, create a new one and link it in. */
1171 if (pr == NULL) {
1172 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1173 if (tpr->pr_childcount >= tpr->pr_childmax) {
1174 error = EPERM;
1175 vfs_opterror(opts, "prison limit exceeded");
1176 goto done_unlock_list;
1177 }
1178 created = 1;
1179 mtx_lock(&ppr->pr_mtx);
1180 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) {
1181 mtx_unlock(&ppr->pr_mtx);
1182 error = ENOENT;
1183 vfs_opterror(opts, "parent jail went away!");
1184 goto done_unlock_list;
1185 }
1186 ppr->pr_ref++;
1187 ppr->pr_uref++;
1188 mtx_unlock(&ppr->pr_mtx);
1189 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1190 if (jid == 0) {
1191 /* Find the next free jid. */
1192 jid = lastprid + 1;
1193 findnext:
1194 if (jid == JAIL_MAX)
1195 jid = 1;
1196 TAILQ_FOREACH(tpr, &allprison, pr_list) {
1197 if (tpr->pr_id < jid)
1198 continue;
1199 if (tpr->pr_id > jid || tpr->pr_ref == 0) {
1200 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1201 break;
1202 }
1203 if (jid == lastprid) {
1204 error = EAGAIN;
1205 vfs_opterror(opts,
1206 "no available jail IDs");
1207 free(pr, M_PRISON);
1208 prison_deref(ppr, PD_DEREF |
1209 PD_DEUREF | PD_LIST_XLOCKED);
1210 goto done_releroot;
1211 }
1212 jid++;
1213 goto findnext;
1214 }
1215 lastprid = jid;
1216 } else {
1217 /*
1218 * The jail already has a jid (that did not yet exist),
1219 * so just find where to insert it.
1220 */
1221 TAILQ_FOREACH(tpr, &allprison, pr_list)
1222 if (tpr->pr_id >= jid) {
1223 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1224 break;
1225 }
1226 }
1227 if (tpr == NULL)
1228 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1229 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1230 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1231 tpr->pr_childcount++;
1232
1233 pr->pr_parent = ppr;
1234 pr->pr_id = jid;
1235
1236 /* Set some default values, and inherit some from the parent. */
1237 if (name == NULL)
1238 name = "";
1239 if (path == NULL) {
1240 path = "/";
1241 root = mypr->pr_root;
1242 vref(root);
1243 }
1244 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1245 pr->pr_flags |= PR_HOST;
1246 #if defined(INET) || defined(INET6)
1247 #ifdef VIMAGE
1248 if (!(pr_flags & PR_VNET))
1249 #endif
1250 {
1251 #ifdef INET
1252 if (!(ch_flags & PR_IP4_USER))
1253 pr->pr_flags |=
1254 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE;
1255 else if (!(pr_flags & PR_IP4_USER)) {
1256 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1257 if (ppr->pr_ip4 != NULL) {
1258 pr->pr_ip4s = ppr->pr_ip4s;
1259 pr->pr_ip4 = malloc(pr->pr_ip4s *
1260 sizeof(struct in_addr), M_PRISON,
1261 M_WAITOK);
1262 bcopy(ppr->pr_ip4, pr->pr_ip4,
1263 pr->pr_ip4s * sizeof(*pr->pr_ip4));
1264 }
1265 }
1266 #endif
1267 #ifdef INET6
1268 if (!(ch_flags & PR_IP6_USER))
1269 pr->pr_flags |=
1270 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE;
1271 else if (!(pr_flags & PR_IP6_USER)) {
1272 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1273 if (ppr->pr_ip6 != NULL) {
1274 pr->pr_ip6s = ppr->pr_ip6s;
1275 pr->pr_ip6 = malloc(pr->pr_ip6s *
1276 sizeof(struct in6_addr), M_PRISON,
1277 M_WAITOK);
1278 bcopy(ppr->pr_ip6, pr->pr_ip6,
1279 pr->pr_ip6s * sizeof(*pr->pr_ip6));
1280 }
1281 }
1282 #endif
1283 }
1284 #endif
1285 /* Source address selection is always on by default. */
1286 pr->pr_flags |= _PR_IP_SADDRSEL;
1287
1288 pr->pr_securelevel = ppr->pr_securelevel;
1289 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1290 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
1291 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
1292
1293 LIST_INIT(&pr->pr_children);
1294 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1295
1296 #ifdef VIMAGE
1297 /* Allocate a new vnet if specified. */
1298 pr->pr_vnet = (pr_flags & PR_VNET)
1299 ? vnet_alloc() : ppr->pr_vnet;
1300 #endif
1301 /*
1302 * Allocate a dedicated cpuset for each jail.
1303 * Unlike other initial settings, this may return an erorr.
1304 */
1305 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1306 if (error) {
1307 prison_deref(pr, PD_LIST_XLOCKED);
1308 goto done_releroot;
1309 }
1310
1311 mtx_lock(&pr->pr_mtx);
1312 /*
1313 * New prisons do not yet have a reference, because we do not
1314 * want other to see the incomplete prison once the
1315 * allprison_lock is downgraded.
1316 */
1317 } else {
1318 created = 0;
1319 /*
1320 * Grab a reference for existing prisons, to ensure they
1321 * continue to exist for the duration of the call.
1322 */
1323 pr->pr_ref++;
1324 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1325 if ((pr->pr_flags & PR_VNET) &&
1326 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1327 error = EINVAL;
1328 vfs_opterror(opts,
1329 "vnet jails cannot have IP address restrictions");
1330 goto done_deref_locked;
1331 }
1332 #endif
1333 #ifdef INET
1334 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1335 error = EINVAL;
1336 vfs_opterror(opts,
1337 "ip4 cannot be changed after creation");
1338 goto done_deref_locked;
1339 }
1340 #endif
1341 #ifdef INET6
1342 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1343 error = EINVAL;
1344 vfs_opterror(opts,
1345 "ip6 cannot be changed after creation");
1346 goto done_deref_locked;
1347 }
1348 #endif
1349 }
1350
1351 /* Do final error checking before setting anything. */
1352 if (gotslevel) {
1353 if (slevel < ppr->pr_securelevel) {
1354 error = EPERM;
1355 goto done_deref_locked;
1356 }
1357 }
1358 if (gotchildmax) {
1359 if (childmax >= ppr->pr_childmax) {
1360 error = EPERM;
1361 goto done_deref_locked;
1362 }
1363 }
1364 if (gotenforce) {
1365 if (enforce < ppr->pr_enforce_statfs) {
1366 error = EPERM;
1367 goto done_deref_locked;
1368 }
1369 }
1370 if (gotrsnum) {
1371 /*
1372 * devfs_rsnum is a uint16_t
1373 */
1374 if (rsnum < 0 || rsnum > 65535) {
1375 error = EINVAL;
1376 goto done_deref_locked;
1377 }
1378 /*
1379 * Nested jails always inherit parent's devfs ruleset
1380 */
1381 if (jailed(td->td_ucred)) {
1382 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
1383 error = EPERM;
1384 goto done_deref_locked;
1385 } else
1386 rsnum = ppr->pr_devfs_rsnum;
1387 }
1388 }
1389 #ifdef INET
1390 if (ip4s > 0) {
1391 if (ppr->pr_flags & PR_IP4) {
1392 /*
1393 * Make sure the new set of IP addresses is a
1394 * subset of the parent's list. Don't worry
1395 * about the parent being unlocked, as any
1396 * setting is done with allprison_lock held.
1397 */
1398 for (ij = 0; ij < ppr->pr_ip4s; ij++)
1399 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
1400 break;
1401 if (ij == ppr->pr_ip4s) {
1402 error = EPERM;
1403 goto done_deref_locked;
1404 }
1405 if (ip4s > 1) {
1406 for (ii = ij = 1; ii < ip4s; ii++) {
1407 if (ip4[ii].s_addr ==
1408 ppr->pr_ip4[0].s_addr)
1409 continue;
1410 for (; ij < ppr->pr_ip4s; ij++)
1411 if (ip4[ii].s_addr ==
1412 ppr->pr_ip4[ij].s_addr)
1413 break;
1414 if (ij == ppr->pr_ip4s)
1415 break;
1416 }
1417 if (ij == ppr->pr_ip4s) {
1418 error = EPERM;
1419 goto done_deref_locked;
1420 }
1421 }
1422 }
1423 /*
1424 * Check for conflicting IP addresses. We permit them
1425 * if there is no more than one IP on each jail. If
1426 * there is a duplicate on a jail with more than one
1427 * IP stop checking and return error.
1428 */
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_IP4_USER))
1445 continue;
1446 descend = 0;
1447 if (tpr->pr_ip4 == NULL ||
1448 (ip4s == 1 && tpr->pr_ip4s == 1))
1449 continue;
1450 for (ii = 0; ii < ip4s; ii++) {
1451 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) {
1452 error = EADDRINUSE;
1453 vfs_opterror(opts,
1454 "IPv4 addresses clash");
1455 goto done_deref_locked;
1456 }
1457 }
1458 }
1459 }
1460 #endif
1461 #ifdef INET6
1462 if (ip6s > 0) {
1463 if (ppr->pr_flags & PR_IP6) {
1464 /*
1465 * Make sure the new set of IP addresses is a
1466 * subset of the parent's list.
1467 */
1468 for (ij = 0; ij < ppr->pr_ip6s; ij++)
1469 if (IN6_ARE_ADDR_EQUAL(&ip6[0],
1470 &ppr->pr_ip6[ij]))
1471 break;
1472 if (ij == ppr->pr_ip6s) {
1473 error = EPERM;
1474 goto done_deref_locked;
1475 }
1476 if (ip6s > 1) {
1477 for (ii = ij = 1; ii < ip6s; ii++) {
1478 if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
1479 &ppr->pr_ip6[0]))
1480 continue;
1481 for (; ij < ppr->pr_ip6s; ij++)
1482 if (IN6_ARE_ADDR_EQUAL(
1483 &ip6[ii], &ppr->pr_ip6[ij]))
1484 break;
1485 if (ij == ppr->pr_ip6s)
1486 break;
1487 }
1488 if (ij == ppr->pr_ip6s) {
1489 error = EPERM;
1490 goto done_deref_locked;
1491 }
1492 }
1493 }
1494 /* Check for conflicting IP addresses. */
1495 tppr = ppr;
1496 #ifdef VIMAGE
1497 for (; tppr != &prison0; tppr = tppr->pr_parent)
1498 if (tppr->pr_flags & PR_VNET)
1499 break;
1500 #endif
1501 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1502 if (tpr == pr ||
1503 #ifdef VIMAGE
1504 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1505 #endif
1506 tpr->pr_uref == 0) {
1507 descend = 0;
1508 continue;
1509 }
1510 if (!(tpr->pr_flags & PR_IP6_USER))
1511 continue;
1512 descend = 0;
1513 if (tpr->pr_ip6 == NULL ||
1514 (ip6s == 1 && tpr->pr_ip6s == 1))
1515 continue;
1516 for (ii = 0; ii < ip6s; ii++) {
1517 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) {
1518 error = EADDRINUSE;
1519 vfs_opterror(opts,
1520 "IPv6 addresses clash");
1521 goto done_deref_locked;
1522 }
1523 }
1524 }
1525 }
1526 #endif
1527 onamelen = namelen = 0;
1528 if (name != NULL) {
1529 /* Give a default name of the jid. */
1530 if (name[0] == '\0')
1531 snprintf(name = numbuf, sizeof(numbuf), "%d", jid);
1532 else if (*namelc == '' || (strtoul(namelc, &p, 10) != jid &&
1533 *p == '\0')) {
1534 error = EINVAL;
1535 vfs_opterror(opts,
1536 "name cannot be numeric (unless it is the jid)");
1537 goto done_deref_locked;
1538 }
1539 /*
1540 * Make sure the name isn't too long for the prison or its
1541 * children.
1542 */
1543 onamelen = strlen(pr->pr_name);
1544 namelen = strlen(name);
1545 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) {
1546 error = ENAMETOOLONG;
1547 goto done_deref_locked;
1548 }
1549 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1550 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
1551 sizeof(pr->pr_name)) {
1552 error = ENAMETOOLONG;
1553 goto done_deref_locked;
1554 }
1555 }
1556 }
1557 if (pr_allow & ~ppr->pr_allow) {
1558 error = EPERM;
1559 goto done_deref_locked;
1560 }
1561
1562 /* Set the parameters of the prison. */
1563 #ifdef INET
1564 redo_ip4 = 0;
1565 if (pr_flags & PR_IP4_USER) {
1566 pr->pr_flags |= PR_IP4;
1567 free(pr->pr_ip4, M_PRISON);
1568 pr->pr_ip4s = ip4s;
1569 pr->pr_ip4 = ip4;
1570 ip4 = NULL;
1571 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1572 #ifdef VIMAGE
1573 if (tpr->pr_flags & PR_VNET) {
1574 descend = 0;
1575 continue;
1576 }
1577 #endif
1578 if (prison_restrict_ip4(tpr, NULL)) {
1579 redo_ip4 = 1;
1580 descend = 0;
1581 }
1582 }
1583 }
1584 #endif
1585 #ifdef INET6
1586 redo_ip6 = 0;
1587 if (pr_flags & PR_IP6_USER) {
1588 pr->pr_flags |= PR_IP6;
1589 free(pr->pr_ip6, M_PRISON);
1590 pr->pr_ip6s = ip6s;
1591 pr->pr_ip6 = ip6;
1592 ip6 = NULL;
1593 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1594 #ifdef VIMAGE
1595 if (tpr->pr_flags & PR_VNET) {
1596 descend = 0;
1597 continue;
1598 }
1599 #endif
1600 if (prison_restrict_ip6(tpr, NULL)) {
1601 redo_ip6 = 1;
1602 descend = 0;
1603 }
1604 }
1605 }
1606 #endif
1607 if (gotslevel) {
1608 pr->pr_securelevel = slevel;
1609 /* Set all child jails to be at least this level. */
1610 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1611 if (tpr->pr_securelevel < slevel)
1612 tpr->pr_securelevel = slevel;
1613 }
1614 if (gotchildmax) {
1615 pr->pr_childmax = childmax;
1616 /* Set all child jails to under this limit. */
1617 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
1618 if (tpr->pr_childmax > childmax - level)
1619 tpr->pr_childmax = childmax > level
1620 ? childmax - level : 0;
1621 }
1622 if (gotenforce) {
1623 pr->pr_enforce_statfs = enforce;
1624 /* Pass this restriction on to the children. */
1625 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1626 if (tpr->pr_enforce_statfs < enforce)
1627 tpr->pr_enforce_statfs = enforce;
1628 }
1629 if (gotrsnum) {
1630 pr->pr_devfs_rsnum = rsnum;
1631 /* Pass this restriction on to the children. */
1632 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1633 tpr->pr_devfs_rsnum = rsnum;
1634 }
1635 if (name != NULL) {
1636 if (ppr == &prison0)
1637 strlcpy(pr->pr_name, name, sizeof(pr->pr_name));
1638 else
1639 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
1640 ppr->pr_name, name);
1641 /* Change this component of child names. */
1642 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1643 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
1644 strlen(tpr->pr_name + onamelen) + 1);
1645 bcopy(pr->pr_name, tpr->pr_name, namelen);
1646 }
1647 }
1648 if (path != NULL) {
1649 /* Try to keep a real-rooted full pathname. */
1650 if (fullpath_disabled && path[0] == '/' &&
1651 strcmp(mypr->pr_path, "/"))
1652 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s",
1653 mypr->pr_path, path);
1654 else
1655 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
1656 pr->pr_root = root;
1657 }
1658 if (PR_HOST & ch_flags & ~pr_flags) {
1659 if (pr->pr_flags & PR_HOST) {
1660 /*
1661 * Copy the parent's host info. As with pr_ip4 above,
1662 * the lack of a lock on the parent is not a problem;
1663 * it is always set with allprison_lock at least
1664 * shared, and is held exclusively here.
1665 */
1666 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
1667 sizeof(pr->pr_hostname));
1668 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
1669 sizeof(pr->pr_domainname));
1670 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
1671 sizeof(pr->pr_hostuuid));
1672 pr->pr_hostid = pr->pr_parent->pr_hostid;
1673 }
1674 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
1675 /* Set this prison, and any descendants without PR_HOST. */
1676 if (host != NULL)
1677 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
1678 if (domain != NULL)
1679 strlcpy(pr->pr_domainname, domain,
1680 sizeof(pr->pr_domainname));
1681 if (uuid != NULL)
1682 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
1683 if (gothid)
1684 pr->pr_hostid = hid;
1685 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1686 if (tpr->pr_flags & PR_HOST)
1687 descend = 0;
1688 else {
1689 if (host != NULL)
1690 strlcpy(tpr->pr_hostname,
1691 pr->pr_hostname,
1692 sizeof(tpr->pr_hostname));
1693 if (domain != NULL)
1694 strlcpy(tpr->pr_domainname,
1695 pr->pr_domainname,
1696 sizeof(tpr->pr_domainname));
1697 if (uuid != NULL)
1698 strlcpy(tpr->pr_hostuuid,
1699 pr->pr_hostuuid,
1700 sizeof(tpr->pr_hostuuid));
1701 if (gothid)
1702 tpr->pr_hostid = hid;
1703 }
1704 }
1705 }
1706 if ((tallow = ch_allow & ~pr_allow)) {
1707 /* Clear allow bits in all children. */
1708 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1709 tpr->pr_allow &= ~tallow;
1710 }
1711 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
1712 /*
1713 * Persistent prisons get an extra reference, and prisons losing their
1714 * persist flag lose that reference. Only do this for existing prisons
1715 * for now, so new ones will remain unseen until after the module
1716 * handlers have completed.
1717 */
1718 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) {
1719 if (pr_flags & PR_PERSIST) {
1720 pr->pr_ref++;
1721 pr->pr_uref++;
1722 } else {
1723 pr->pr_ref--;
1724 pr->pr_uref--;
1725 }
1726 }
1727 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
1728 mtx_unlock(&pr->pr_mtx);
1729
1730 #ifdef RACCT
1731 if (created)
1732 prison_racct_attach(pr);
1733 #endif
1734
1735 /* Locks may have prevented a complete restriction of child IP
1736 * addresses. If so, allocate some more memory and try again.
1737 */
1738 #ifdef INET
1739 while (redo_ip4) {
1740 ip4s = pr->pr_ip4s;
1741 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
1742 mtx_lock(&pr->pr_mtx);
1743 redo_ip4 = 0;
1744 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1745 #ifdef VIMAGE
1746 if (tpr->pr_flags & PR_VNET) {
1747 descend = 0;
1748 continue;
1749 }
1750 #endif
1751 if (prison_restrict_ip4(tpr, ip4)) {
1752 if (ip4 != NULL)
1753 ip4 = NULL;
1754 else
1755 redo_ip4 = 1;
1756 }
1757 }
1758 mtx_unlock(&pr->pr_mtx);
1759 }
1760 #endif
1761 #ifdef INET6
1762 while (redo_ip6) {
1763 ip6s = pr->pr_ip6s;
1764 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
1765 mtx_lock(&pr->pr_mtx);
1766 redo_ip6 = 0;
1767 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1768 #ifdef VIMAGE
1769 if (tpr->pr_flags & PR_VNET) {
1770 descend = 0;
1771 continue;
1772 }
1773 #endif
1774 if (prison_restrict_ip6(tpr, ip6)) {
1775 if (ip6 != NULL)
1776 ip6 = NULL;
1777 else
1778 redo_ip6 = 1;
1779 }
1780 }
1781 mtx_unlock(&pr->pr_mtx);
1782 }
1783 #endif
1784
1785 /* Let the modules do their work. */
1786 sx_downgrade(&allprison_lock);
1787 if (created) {
1788 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
1789 if (error) {
1790 prison_deref(pr, PD_LIST_SLOCKED);
1791 goto done_errmsg;
1792 }
1793 }
1794 error = osd_jail_call(pr, PR_METHOD_SET, opts);
1795 if (error) {
1796 prison_deref(pr, created
1797 ? PD_LIST_SLOCKED
1798 : PD_DEREF | PD_LIST_SLOCKED);
1799 goto done_errmsg;
1800 }
1801
1802 /* Attach this process to the prison if requested. */
1803 if (flags & JAIL_ATTACH) {
1804 mtx_lock(&pr->pr_mtx);
1805 error = do_jail_attach(td, pr);
1806 if (error) {
1807 vfs_opterror(opts, "attach failed");
1808 if (!created)
1809 prison_deref(pr, PD_DEREF);
1810 goto done_errmsg;
1811 }
1812 }
1813
1814 #ifdef RACCT
1815 if (!created) {
1816 sx_sunlock(&allprison_lock);
1817 prison_racct_modify(pr);
1818 sx_slock(&allprison_lock);
1819 }
1820 #endif
1821
1822 td->td_retval[0] = pr->pr_id;
1823
1824 /*
1825 * Now that it is all there, drop the temporary reference from existing
1826 * prisons. Or add a reference to newly created persistent prisons
1827 * (which was not done earlier so that the prison would not be publicly
1828 * visible).
1829 */
1830 if (!created) {
1831 prison_deref(pr, (flags & JAIL_ATTACH)
1832 ? PD_DEREF
1833 : PD_DEREF | PD_LIST_SLOCKED);
1834 } else {
1835 if (pr_flags & PR_PERSIST) {
1836 mtx_lock(&pr->pr_mtx);
1837 pr->pr_ref++;
1838 pr->pr_uref++;
1839 mtx_unlock(&pr->pr_mtx);
1840 }
1841 if (!(flags & JAIL_ATTACH))
1842 sx_sunlock(&allprison_lock);
1843 }
1844
1845 goto done_errmsg;
1846
1847 done_deref_locked:
1848 prison_deref(pr, created
1849 ? PD_LOCKED | PD_LIST_XLOCKED
1850 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
1851 goto done_releroot;
1852 done_unlock_list:
1853 sx_xunlock(&allprison_lock);
1854 done_releroot:
1855 if (root != NULL) {
1856 vfslocked = VFS_LOCK_GIANT(root->v_mount);
1857 vrele(root);
1858 VFS_UNLOCK_GIANT(vfslocked);
1859 }
1860 done_errmsg:
1861 if (error) {
1862 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
1863 if (errmsg_len > 0) {
1864 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
1865 if (errmsg_pos > 0) {
1866 if (optuio->uio_segflg == UIO_SYSSPACE)
1867 bcopy(errmsg,
1868 optuio->uio_iov[errmsg_pos].iov_base,
1869 errmsg_len);
1870 else
1871 copyout(errmsg,
1872 optuio->uio_iov[errmsg_pos].iov_base,
1873 errmsg_len);
1874 }
1875 }
1876 }
1877 done_free:
1878 #ifdef INET
1879 free(ip4, M_PRISON);
1880 #endif
1881 #ifdef INET6
1882 free(ip6, M_PRISON);
1883 #endif
1884 if (g_path != NULL)
1885 free(g_path, M_TEMP);
1886 vfs_freeopts(opts);
1887 return (error);
1888 }
1889
1890
1891 /*
1892 * struct jail_get_args {
1893 * struct iovec *iovp;
1894 * unsigned int iovcnt;
1895 * int flags;
1896 * };
1897 */
1898 int
1899 sys_jail_get(struct thread *td, struct jail_get_args *uap)
1900 {
1901 struct uio *auio;
1902 int error;
1903
1904 /* Check that we have an even number of iovecs. */
1905 if (uap->iovcnt & 1)
1906 return (EINVAL);
1907
1908 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
1909 if (error)
1910 return (error);
1911 error = kern_jail_get(td, auio, uap->flags);
1912 if (error == 0)
1913 error = copyout(auio->uio_iov, uap->iovp,
1914 uap->iovcnt * sizeof (struct iovec));
1915 free(auio, M_IOV);
1916 return (error);
1917 }
1918
1919 int
1920 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
1921 {
1922 struct prison *pr, *mypr;
1923 struct vfsopt *opt;
1924 struct vfsoptlist *opts;
1925 char *errmsg, *name;
1926 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos;
1927
1928 if (flags & ~JAIL_GET_MASK)
1929 return (EINVAL);
1930
1931 /* Get the parameter list. */
1932 error = vfs_buildopts(optuio, &opts);
1933 if (error)
1934 return (error);
1935 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
1936 mypr = td->td_ucred->cr_prison;
1937
1938 /*
1939 * Find the prison specified by one of: lastjid, jid, name.
1940 */
1941 sx_slock(&allprison_lock);
1942 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
1943 if (error == 0) {
1944 TAILQ_FOREACH(pr, &allprison, pr_list) {
1945 if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
1946 mtx_lock(&pr->pr_mtx);
1947 if (pr->pr_ref > 0 &&
1948 (pr->pr_uref > 0 || (flags & JAIL_DYING)))
1949 break;
1950 mtx_unlock(&pr->pr_mtx);
1951 }
1952 }
1953 if (pr != NULL)
1954 goto found_prison;
1955 error = ENOENT;
1956 vfs_opterror(opts, "no jail after %d", jid);
1957 goto done_unlock_list;
1958 } else if (error != ENOENT)
1959 goto done_unlock_list;
1960
1961 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
1962 if (error == 0) {
1963 if (jid != 0) {
1964 pr = prison_find_child(mypr, jid);
1965 if (pr != NULL) {
1966 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1967 mtx_unlock(&pr->pr_mtx);
1968 error = ENOENT;
1969 vfs_opterror(opts, "jail %d is dying",
1970 jid);
1971 goto done_unlock_list;
1972 }
1973 goto found_prison;
1974 }
1975 error = ENOENT;
1976 vfs_opterror(opts, "jail %d not found", jid);
1977 goto done_unlock_list;
1978 }
1979 } else if (error != ENOENT)
1980 goto done_unlock_list;
1981
1982 error = vfs_getopt(opts, "name", (void **)&name, &len);
1983 if (error == 0) {
1984 if (len == 0 || name[len - 1] != '\0') {
1985 error = EINVAL;
1986 goto done_unlock_list;
1987 }
1988 pr = prison_find_name(mypr, name);
1989 if (pr != NULL) {
1990 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1991 mtx_unlock(&pr->pr_mtx);
1992 error = ENOENT;
1993 vfs_opterror(opts, "jail \"%s\" is dying",
1994 name);
1995 goto done_unlock_list;
1996 }
1997 goto found_prison;
1998 }
1999 error = ENOENT;
2000 vfs_opterror(opts, "jail \"%s\" not found", name);
2001 goto done_unlock_list;
2002 } else if (error != ENOENT)
2003 goto done_unlock_list;
2004
2005 vfs_opterror(opts, "no jail specified");
2006 error = ENOENT;
2007 goto done_unlock_list;
2008
2009 found_prison:
2010 /* Get the parameters of the prison. */
2011 pr->pr_ref++;
2012 locked = PD_LOCKED;
2013 td->td_retval[0] = pr->pr_id;
2014 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
2015 if (error != 0 && error != ENOENT)
2016 goto done_deref;
2017 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
2018 error = vfs_setopt(opts, "parent", &i, sizeof(i));
2019 if (error != 0 && error != ENOENT)
2020 goto done_deref;
2021 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
2022 if (error != 0 && error != ENOENT)
2023 goto done_deref;
2024 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
2025 sizeof(pr->pr_cpuset->cs_id));
2026 if (error != 0 && error != ENOENT)
2027 goto done_deref;
2028 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
2029 if (error != 0 && error != ENOENT)
2030 goto done_deref;
2031 #ifdef INET
2032 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
2033 pr->pr_ip4s * sizeof(*pr->pr_ip4));
2034 if (error != 0 && error != ENOENT)
2035 goto done_deref;
2036 #endif
2037 #ifdef INET6
2038 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
2039 pr->pr_ip6s * sizeof(*pr->pr_ip6));
2040 if (error != 0 && error != ENOENT)
2041 goto done_deref;
2042 #endif
2043 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
2044 sizeof(pr->pr_securelevel));
2045 if (error != 0 && error != ENOENT)
2046 goto done_deref;
2047 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
2048 sizeof(pr->pr_childcount));
2049 if (error != 0 && error != ENOENT)
2050 goto done_deref;
2051 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
2052 sizeof(pr->pr_childmax));
2053 if (error != 0 && error != ENOENT)
2054 goto done_deref;
2055 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
2056 if (error != 0 && error != ENOENT)
2057 goto done_deref;
2058 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
2059 if (error != 0 && error != ENOENT)
2060 goto done_deref;
2061 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
2062 if (error != 0 && error != ENOENT)
2063 goto done_deref;
2064 #ifdef COMPAT_FREEBSD32
2065 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
2066 uint32_t hid32 = pr->pr_hostid;
2067
2068 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
2069 } else
2070 #endif
2071 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
2072 sizeof(pr->pr_hostid));
2073 if (error != 0 && error != ENOENT)
2074 goto done_deref;
2075 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
2076 sizeof(pr->pr_enforce_statfs));
2077 if (error != 0 && error != ENOENT)
2078 goto done_deref;
2079 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
2080 sizeof(pr->pr_devfs_rsnum));
2081 if (error != 0 && error != ENOENT)
2082 goto done_deref;
2083 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
2084 fi++) {
2085 if (pr_flag_names[fi] == NULL)
2086 continue;
2087 i = (pr->pr_flags & (1 << fi)) ? 1 : 0;
2088 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i));
2089 if (error != 0 && error != ENOENT)
2090 goto done_deref;
2091 i = !i;
2092 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i));
2093 if (error != 0 && error != ENOENT)
2094 goto done_deref;
2095 }
2096 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
2097 fi++) {
2098 i = pr->pr_flags &
2099 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
2100 i = pr_flag_jailsys[fi].disable &&
2101 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE
2102 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW
2103 : JAIL_SYS_INHERIT;
2104 error =
2105 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i));
2106 if (error != 0 && error != ENOENT)
2107 goto done_deref;
2108 }
2109 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
2110 fi++) {
2111 if (pr_allow_names[fi] == NULL)
2112 continue;
2113 i = (pr->pr_allow & (1 << fi)) ? 1 : 0;
2114 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i));
2115 if (error != 0 && error != ENOENT)
2116 goto done_deref;
2117 i = !i;
2118 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i));
2119 if (error != 0 && error != ENOENT)
2120 goto done_deref;
2121 }
2122 i = (pr->pr_uref == 0);
2123 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2124 if (error != 0 && error != ENOENT)
2125 goto done_deref;
2126 i = !i;
2127 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2128 if (error != 0 && error != ENOENT)
2129 goto done_deref;
2130
2131 /* Get the module parameters. */
2132 mtx_unlock(&pr->pr_mtx);
2133 locked = 0;
2134 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2135 if (error)
2136 goto done_deref;
2137 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
2138
2139 /* By now, all parameters should have been noted. */
2140 TAILQ_FOREACH(opt, opts, link) {
2141 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2142 error = EINVAL;
2143 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2144 goto done_errmsg;
2145 }
2146 }
2147
2148 /* Write the fetched parameters back to userspace. */
2149 error = 0;
2150 TAILQ_FOREACH(opt, opts, link) {
2151 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2152 pos = 2 * opt->pos + 1;
2153 optuio->uio_iov[pos].iov_len = opt->len;
2154 if (opt->value != NULL) {
2155 if (optuio->uio_segflg == UIO_SYSSPACE) {
2156 bcopy(opt->value,
2157 optuio->uio_iov[pos].iov_base,
2158 opt->len);
2159 } else {
2160 error = copyout(opt->value,
2161 optuio->uio_iov[pos].iov_base,
2162 opt->len);
2163 if (error)
2164 break;
2165 }
2166 }
2167 }
2168 }
2169 goto done_errmsg;
2170
2171 done_deref:
2172 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
2173 goto done_errmsg;
2174
2175 done_unlock_list:
2176 sx_sunlock(&allprison_lock);
2177 done_errmsg:
2178 if (error && errmsg_pos >= 0) {
2179 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2180 errmsg_pos = 2 * errmsg_pos + 1;
2181 if (errmsg_len > 0) {
2182 if (optuio->uio_segflg == UIO_SYSSPACE)
2183 bcopy(errmsg,
2184 optuio->uio_iov[errmsg_pos].iov_base,
2185 errmsg_len);
2186 else
2187 copyout(errmsg,
2188 optuio->uio_iov[errmsg_pos].iov_base,
2189 errmsg_len);
2190 }
2191 }
2192 vfs_freeopts(opts);
2193 return (error);
2194 }
2195
2196
2197 /*
2198 * struct jail_remove_args {
2199 * int jid;
2200 * };
2201 */
2202 int
2203 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
2204 {
2205 struct prison *pr, *cpr, *lpr, *tpr;
2206 int descend, error;
2207
2208 error = priv_check(td, PRIV_JAIL_REMOVE);
2209 if (error)
2210 return (error);
2211
2212 sx_xlock(&allprison_lock);
2213 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2214 if (pr == NULL) {
2215 sx_xunlock(&allprison_lock);
2216 return (EINVAL);
2217 }
2218
2219 /* Remove all descendants of this prison, then remove this prison. */
2220 pr->pr_ref++;
2221 pr->pr_flags |= PR_REMOVE;
2222 if (!LIST_EMPTY(&pr->pr_children)) {
2223 mtx_unlock(&pr->pr_mtx);
2224 lpr = NULL;
2225 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
2226 mtx_lock(&cpr->pr_mtx);
2227 if (cpr->pr_ref > 0) {
2228 tpr = cpr;
2229 cpr->pr_ref++;
2230 cpr->pr_flags |= PR_REMOVE;
2231 } else {
2232 /* Already removed - do not do it again. */
2233 tpr = NULL;
2234 }
2235 mtx_unlock(&cpr->pr_mtx);
2236 if (lpr != NULL) {
2237 mtx_lock(&lpr->pr_mtx);
2238 prison_remove_one(lpr);
2239 sx_xlock(&allprison_lock);
2240 }
2241 lpr = tpr;
2242 }
2243 if (lpr != NULL) {
2244 mtx_lock(&lpr->pr_mtx);
2245 prison_remove_one(lpr);
2246 sx_xlock(&allprison_lock);
2247 }
2248 mtx_lock(&pr->pr_mtx);
2249 }
2250 prison_remove_one(pr);
2251 return (0);
2252 }
2253
2254 static void
2255 prison_remove_one(struct prison *pr)
2256 {
2257 struct proc *p;
2258 int deuref;
2259
2260 /* If the prison was persistent, it is not anymore. */
2261 deuref = 0;
2262 if (pr->pr_flags & PR_PERSIST) {
2263 pr->pr_ref--;
2264 deuref = PD_DEUREF;
2265 pr->pr_flags &= ~PR_PERSIST;
2266 }
2267
2268 /*
2269 * jail_remove added a reference. If that's the only one, remove
2270 * the prison now.
2271 */
2272 KASSERT(pr->pr_ref > 0,
2273 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
2274 if (pr->pr_ref == 1) {
2275 prison_deref(pr,
2276 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
2277 return;
2278 }
2279
2280 mtx_unlock(&pr->pr_mtx);
2281 sx_xunlock(&allprison_lock);
2282 /*
2283 * Kill all processes unfortunate enough to be attached to this prison.
2284 */
2285 sx_slock(&allproc_lock);
2286 LIST_FOREACH(p, &allproc, p_list) {
2287 PROC_LOCK(p);
2288 if (p->p_state != PRS_NEW && p->p_ucred &&
2289 p->p_ucred->cr_prison == pr)
2290 kern_psignal(p, SIGKILL);
2291 PROC_UNLOCK(p);
2292 }
2293 sx_sunlock(&allproc_lock);
2294 /* Remove the temporary reference added by jail_remove. */
2295 prison_deref(pr, deuref | PD_DEREF);
2296 }
2297
2298
2299 /*
2300 * struct jail_attach_args {
2301 * int jid;
2302 * };
2303 */
2304 int
2305 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
2306 {
2307 struct prison *pr;
2308 int error;
2309
2310 error = priv_check(td, PRIV_JAIL_ATTACH);
2311 if (error)
2312 return (error);
2313
2314 sx_slock(&allprison_lock);
2315 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2316 if (pr == NULL) {
2317 sx_sunlock(&allprison_lock);
2318 return (EINVAL);
2319 }
2320
2321 /*
2322 * Do not allow a process to attach to a prison that is not
2323 * considered to be "alive".
2324 */
2325 if (pr->pr_uref == 0) {
2326 mtx_unlock(&pr->pr_mtx);
2327 sx_sunlock(&allprison_lock);
2328 return (EINVAL);
2329 }
2330
2331 return (do_jail_attach(td, pr));
2332 }
2333
2334 static int
2335 do_jail_attach(struct thread *td, struct prison *pr)
2336 {
2337 struct prison *ppr;
2338 struct proc *p;
2339 struct ucred *newcred, *oldcred;
2340 int vfslocked, error;
2341
2342 /*
2343 * XXX: Note that there is a slight race here if two threads
2344 * in the same privileged process attempt to attach to two
2345 * different jails at the same time. It is important for
2346 * user processes not to do this, or they might end up with
2347 * a process root from one prison, but attached to the jail
2348 * of another.
2349 */
2350 pr->pr_ref++;
2351 pr->pr_uref++;
2352 mtx_unlock(&pr->pr_mtx);
2353
2354 /* Let modules do whatever they need to prepare for attaching. */
2355 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
2356 if (error) {
2357 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
2358 return (error);
2359 }
2360 sx_sunlock(&allprison_lock);
2361
2362 /*
2363 * Reparent the newly attached process to this jail.
2364 */
2365 ppr = td->td_ucred->cr_prison;
2366 p = td->td_proc;
2367 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
2368 if (error)
2369 goto e_revert_osd;
2370
2371 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
2372 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
2373 if ((error = change_dir(pr->pr_root, td)) != 0)
2374 goto e_unlock;
2375 #ifdef MAC
2376 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
2377 goto e_unlock;
2378 #endif
2379 VOP_UNLOCK(pr->pr_root, 0);
2380 if ((error = change_root(pr->pr_root, td)))
2381 goto e_unlock_giant;
2382 VFS_UNLOCK_GIANT(vfslocked);
2383
2384 newcred = crget();
2385 PROC_LOCK(p);
2386 oldcred = p->p_ucred;
2387 setsugid(p);
2388 crcopy(newcred, oldcred);
2389 newcred->cr_prison = pr;
2390 p->p_ucred = newcred;
2391 PROC_UNLOCK(p);
2392 #ifdef RACCT
2393 racct_proc_ucred_changed(p, oldcred, newcred);
2394 #endif
2395 crfree(oldcred);
2396 prison_deref(ppr, PD_DEREF | PD_DEUREF);
2397 return (0);
2398 e_unlock:
2399 VOP_UNLOCK(pr->pr_root, 0);
2400 e_unlock_giant:
2401 VFS_UNLOCK_GIANT(vfslocked);
2402 e_revert_osd:
2403 /* Tell modules this thread is still in its old jail after all. */
2404 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td);
2405 prison_deref(pr, PD_DEREF | PD_DEUREF);
2406 return (error);
2407 }
2408
2409
2410 /*
2411 * Returns a locked prison instance, or NULL on failure.
2412 */
2413 struct prison *
2414 prison_find(int prid)
2415 {
2416 struct prison *pr;
2417
2418 sx_assert(&allprison_lock, SX_LOCKED);
2419 TAILQ_FOREACH(pr, &allprison, pr_list) {
2420 if (pr->pr_id == prid) {
2421 mtx_lock(&pr->pr_mtx);
2422 if (pr->pr_ref > 0)
2423 return (pr);
2424 mtx_unlock(&pr->pr_mtx);
2425 }
2426 }
2427 return (NULL);
2428 }
2429
2430 /*
2431 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
2432 */
2433 struct prison *
2434 prison_find_child(struct prison *mypr, int prid)
2435 {
2436 struct prison *pr;
2437 int descend;
2438
2439 sx_assert(&allprison_lock, SX_LOCKED);
2440 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2441 if (pr->pr_id == prid) {
2442 mtx_lock(&pr->pr_mtx);
2443 if (pr->pr_ref > 0)
2444 return (pr);
2445 mtx_unlock(&pr->pr_mtx);
2446 }
2447 }
2448 return (NULL);
2449 }
2450
2451 /*
2452 * Look for the name relative to mypr. Returns a locked prison or NULL.
2453 */
2454 struct prison *
2455 prison_find_name(struct prison *mypr, const char *name)
2456 {
2457 struct prison *pr, *deadpr;
2458 size_t mylen;
2459 int descend;
2460
2461 sx_assert(&allprison_lock, SX_LOCKED);
2462 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
2463 again:
2464 deadpr = NULL;
2465 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2466 if (!strcmp(pr->pr_name + mylen, name)) {
2467 mtx_lock(&pr->pr_mtx);
2468 if (pr->pr_ref > 0) {
2469 if (pr->pr_uref > 0)
2470 return (pr);
2471 deadpr = pr;
2472 }
2473 mtx_unlock(&pr->pr_mtx);
2474 }
2475 }
2476 /* There was no valid prison - perhaps there was a dying one. */
2477 if (deadpr != NULL) {
2478 mtx_lock(&deadpr->pr_mtx);
2479 if (deadpr->pr_ref == 0) {
2480 mtx_unlock(&deadpr->pr_mtx);
2481 goto again;
2482 }
2483 }
2484 return (deadpr);
2485 }
2486
2487 /*
2488 * See if a prison has the specific flag set.
2489 */
2490 int
2491 prison_flag(struct ucred *cred, unsigned flag)
2492 {
2493
2494 /* This is an atomic read, so no locking is necessary. */
2495 return (cred->cr_prison->pr_flags & flag);
2496 }
2497
2498 int
2499 prison_allow(struct ucred *cred, unsigned flag)
2500 {
2501
2502 /* This is an atomic read, so no locking is necessary. */
2503 return (cred->cr_prison->pr_allow & flag);
2504 }
2505
2506 /*
2507 * Remove a prison reference. If that was the last reference, remove the
2508 * prison itself - but not in this context in case there are locks held.
2509 */
2510 void
2511 prison_free_locked(struct prison *pr)
2512 {
2513
2514 mtx_assert(&pr->pr_mtx, MA_OWNED);
2515 pr->pr_ref--;
2516 if (pr->pr_ref == 0) {
2517 mtx_unlock(&pr->pr_mtx);
2518 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
2519 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2520 return;
2521 }
2522 mtx_unlock(&pr->pr_mtx);
2523 }
2524
2525 void
2526 prison_free(struct prison *pr)
2527 {
2528
2529 mtx_lock(&pr->pr_mtx);
2530 prison_free_locked(pr);
2531 }
2532
2533 static void
2534 prison_complete(void *context, int pending)
2535 {
2536
2537 prison_deref((struct prison *)context, 0);
2538 }
2539
2540 /*
2541 * Remove a prison reference (usually). This internal version assumes no
2542 * mutexes are held, except perhaps the prison itself. If there are no more
2543 * references, release and delist the prison. On completion, the prison lock
2544 * and the allprison lock are both unlocked.
2545 */
2546 static void
2547 prison_deref(struct prison *pr, int flags)
2548 {
2549 struct prison *ppr, *tpr;
2550 int vfslocked;
2551
2552 if (!(flags & PD_LOCKED))
2553 mtx_lock(&pr->pr_mtx);
2554 for (;;) {
2555 if (flags & PD_DEUREF) {
2556 pr->pr_uref--;
2557 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0"));
2558 }
2559 if (flags & PD_DEREF)
2560 pr->pr_ref--;
2561 /* If the prison still has references, nothing else to do. */
2562 if (pr->pr_ref > 0) {
2563 mtx_unlock(&pr->pr_mtx);
2564 if (flags & PD_LIST_SLOCKED)
2565 sx_sunlock(&allprison_lock);
2566 else if (flags & PD_LIST_XLOCKED)
2567 sx_xunlock(&allprison_lock);
2568 return;
2569 }
2570
2571 mtx_unlock(&pr->pr_mtx);
2572 if (flags & PD_LIST_SLOCKED) {
2573 if (!sx_try_upgrade(&allprison_lock)) {
2574 sx_sunlock(&allprison_lock);
2575 sx_xlock(&allprison_lock);
2576 }
2577 } else if (!(flags & PD_LIST_XLOCKED))
2578 sx_xlock(&allprison_lock);
2579
2580 TAILQ_REMOVE(&allprison, pr, pr_list);
2581 LIST_REMOVE(pr, pr_sibling);
2582 ppr = pr->pr_parent;
2583 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
2584 tpr->pr_childcount--;
2585 sx_xunlock(&allprison_lock);
2586
2587 #ifdef VIMAGE
2588 if (pr->pr_vnet != ppr->pr_vnet)
2589 vnet_destroy(pr->pr_vnet);
2590 #endif
2591 if (pr->pr_root != NULL) {
2592 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
2593 vrele(pr->pr_root);
2594 VFS_UNLOCK_GIANT(vfslocked);
2595 }
2596 mtx_destroy(&pr->pr_mtx);
2597 #ifdef INET
2598 free(pr->pr_ip4, M_PRISON);
2599 #endif
2600 #ifdef INET6
2601 free(pr->pr_ip6, M_PRISON);
2602 #endif
2603 if (pr->pr_cpuset != NULL)
2604 cpuset_rel(pr->pr_cpuset);
2605 osd_jail_exit(pr);
2606 #ifdef RACCT
2607 prison_racct_detach(pr);
2608 #endif
2609 free(pr, M_PRISON);
2610
2611 /* Removing a prison frees a reference on its parent. */
2612 pr = ppr;
2613 mtx_lock(&pr->pr_mtx);
2614 flags = PD_DEREF | PD_DEUREF;
2615 }
2616 }
2617
2618 void
2619 prison_hold_locked(struct prison *pr)
2620 {
2621
2622 mtx_assert(&pr->pr_mtx, MA_OWNED);
2623 KASSERT(pr->pr_ref > 0,
2624 ("Trying to hold dead prison (jid=%d).", pr->pr_id));
2625 pr->pr_ref++;
2626 }
2627
2628 void
2629 prison_hold(struct prison *pr)
2630 {
2631
2632 mtx_lock(&pr->pr_mtx);
2633 prison_hold_locked(pr);
2634 mtx_unlock(&pr->pr_mtx);
2635 }
2636
2637 void
2638 prison_proc_hold(struct prison *pr)
2639 {
2640
2641 mtx_lock(&pr->pr_mtx);
2642 KASSERT(pr->pr_uref > 0,
2643 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
2644 pr->pr_uref++;
2645 mtx_unlock(&pr->pr_mtx);
2646 }
2647
2648 void
2649 prison_proc_free(struct prison *pr)
2650 {
2651
2652 mtx_lock(&pr->pr_mtx);
2653 KASSERT(pr->pr_uref > 0,
2654 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
2655 prison_deref(pr, PD_DEUREF | PD_LOCKED);
2656 }
2657
2658
2659 #ifdef INET
2660 /*
2661 * Restrict a prison's IP address list with its parent's, possibly replacing
2662 * it. Return true if the replacement buffer was used (or would have been).
2663 */
2664 static int
2665 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
2666 {
2667 int ii, ij, used;
2668 struct prison *ppr;
2669
2670 ppr = pr->pr_parent;
2671 if (!(pr->pr_flags & PR_IP4_USER)) {
2672 /* This has no user settings, so just copy the parent's list. */
2673 if (pr->pr_ip4s < ppr->pr_ip4s) {
2674 /*
2675 * There's no room for the parent's list. Use the
2676 * new list buffer, which is assumed to be big enough
2677 * (if it was passed). If there's no buffer, try to
2678 * allocate one.
2679 */
2680 used = 1;
2681 if (newip4 == NULL) {
2682 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
2683 M_PRISON, M_NOWAIT);
2684 if (newip4 != NULL)
2685 used = 0;
2686 }
2687 if (newip4 != NULL) {
2688 bcopy(ppr->pr_ip4, newip4,
2689 ppr->pr_ip4s * sizeof(*newip4));
2690 free(pr->pr_ip4, M_PRISON);
2691 pr->pr_ip4 = newip4;
2692 pr->pr_ip4s = ppr->pr_ip4s;
2693 }
2694 return (used);
2695 }
2696 pr->pr_ip4s = ppr->pr_ip4s;
2697 if (pr->pr_ip4s > 0)
2698 bcopy(ppr->pr_ip4, pr->pr_ip4,
2699 pr->pr_ip4s * sizeof(*newip4));
2700 else if (pr->pr_ip4 != NULL) {
2701 free(pr->pr_ip4, M_PRISON);
2702 pr->pr_ip4 = NULL;
2703 }
2704 } else if (pr->pr_ip4s > 0) {
2705 /* Remove addresses that aren't in the parent. */
2706 for (ij = 0; ij < ppr->pr_ip4s; ij++)
2707 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
2708 break;
2709 if (ij < ppr->pr_ip4s)
2710 ii = 1;
2711 else {
2712 bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
2713 --pr->pr_ip4s * sizeof(*pr->pr_ip4));
2714 ii = 0;
2715 }
2716 for (ij = 1; ii < pr->pr_ip4s; ) {
2717 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
2718 ii++;
2719 continue;
2720 }
2721 switch (ij >= ppr->pr_ip4s ? -1 :
2722 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
2723 case -1:
2724 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
2725 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
2726 break;
2727 case 0:
2728 ii++;
2729 ij++;
2730 break;
2731 case 1:
2732 ij++;
2733 break;
2734 }
2735 }
2736 if (pr->pr_ip4s == 0) {
2737 pr->pr_flags |= PR_IP4_DISABLE;
2738 free(pr->pr_ip4, M_PRISON);
2739 pr->pr_ip4 = NULL;
2740 }
2741 }
2742 return (0);
2743 }
2744
2745 /*
2746 * Pass back primary IPv4 address of this jail.
2747 *
2748 * If not restricted return success but do not alter the address. Caller has
2749 * to make sure to initialize it correctly (e.g. INADDR_ANY).
2750 *
2751 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2752 * Address returned in NBO.
2753 */
2754 int
2755 prison_get_ip4(struct ucred *cred, struct in_addr *ia)
2756 {
2757 struct prison *pr;
2758
2759 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2760 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2761
2762 pr = cred->cr_prison;
2763 if (!(pr->pr_flags & PR_IP4))
2764 return (0);
2765 mtx_lock(&pr->pr_mtx);
2766 if (!(pr->pr_flags & PR_IP4)) {
2767 mtx_unlock(&pr->pr_mtx);
2768 return (0);
2769 }
2770 if (pr->pr_ip4 == NULL) {
2771 mtx_unlock(&pr->pr_mtx);
2772 return (EAFNOSUPPORT);
2773 }
2774
2775 ia->s_addr = pr->pr_ip4[0].s_addr;
2776 mtx_unlock(&pr->pr_mtx);
2777 return (0);
2778 }
2779
2780 /*
2781 * Return 1 if we should do proper source address selection or are not jailed.
2782 * We will return 0 if we should bypass source address selection in favour
2783 * of the primary jail IPv4 address. Only in this case *ia will be updated and
2784 * returned in NBO.
2785 * Return EAFNOSUPPORT, in case this jail does not allow IPv4.
2786 */
2787 int
2788 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
2789 {
2790 struct prison *pr;
2791 struct in_addr lia;
2792 int error;
2793
2794 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2795 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2796
2797 if (!jailed(cred))
2798 return (1);
2799
2800 pr = cred->cr_prison;
2801 if (pr->pr_flags & PR_IP4_SADDRSEL)
2802 return (1);
2803
2804 lia.s_addr = INADDR_ANY;
2805 error = prison_get_ip4(cred, &lia);
2806 if (error)
2807 return (error);
2808 if (lia.s_addr == INADDR_ANY)
2809 return (1);
2810
2811 ia->s_addr = lia.s_addr;
2812 return (0);
2813 }
2814
2815 /*
2816 * Return true if pr1 and pr2 have the same IPv4 address restrictions.
2817 */
2818 int
2819 prison_equal_ip4(struct prison *pr1, struct prison *pr2)
2820 {
2821
2822 if (pr1 == pr2)
2823 return (1);
2824
2825 /*
2826 * No need to lock since the PR_IP4_USER flag can't be altered for
2827 * existing prisons.
2828 */
2829 while (pr1 != &prison0 &&
2830 #ifdef VIMAGE
2831 !(pr1->pr_flags & PR_VNET) &&
2832 #endif
2833 !(pr1->pr_flags & PR_IP4_USER))
2834 pr1 = pr1->pr_parent;
2835 while (pr2 != &prison0 &&
2836 #ifdef VIMAGE
2837 !(pr2->pr_flags & PR_VNET) &&
2838 #endif
2839 !(pr2->pr_flags & PR_IP4_USER))
2840 pr2 = pr2->pr_parent;
2841 return (pr1 == pr2);
2842 }
2843
2844 /*
2845 * Make sure our (source) address is set to something meaningful to this
2846 * jail.
2847 *
2848 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2849 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2850 * doesn't allow IPv4. Address passed in in NBO and returned in NBO.
2851 */
2852 int
2853 prison_local_ip4(struct ucred *cred, struct in_addr *ia)
2854 {
2855 struct prison *pr;
2856 struct in_addr ia0;
2857 int error;
2858
2859 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2860 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2861
2862 pr = cred->cr_prison;
2863 if (!(pr->pr_flags & PR_IP4))
2864 return (0);
2865 mtx_lock(&pr->pr_mtx);
2866 if (!(pr->pr_flags & PR_IP4)) {
2867 mtx_unlock(&pr->pr_mtx);
2868 return (0);
2869 }
2870 if (pr->pr_ip4 == NULL) {
2871 mtx_unlock(&pr->pr_mtx);
2872 return (EAFNOSUPPORT);
2873 }
2874
2875 ia0.s_addr = ntohl(ia->s_addr);
2876 if (ia0.s_addr == INADDR_LOOPBACK) {
2877 ia->s_addr = pr->pr_ip4[0].s_addr;
2878 mtx_unlock(&pr->pr_mtx);
2879 return (0);
2880 }
2881
2882 if (ia0.s_addr == INADDR_ANY) {
2883 /*
2884 * In case there is only 1 IPv4 address, bind directly.
2885 */
2886 if (pr->pr_ip4s == 1)
2887 ia->s_addr = pr->pr_ip4[0].s_addr;
2888 mtx_unlock(&pr->pr_mtx);
2889 return (0);
2890 }
2891
2892 error = _prison_check_ip4(pr, ia);
2893 mtx_unlock(&pr->pr_mtx);
2894 return (error);
2895 }
2896
2897 /*
2898 * Rewrite destination address in case we will connect to loopback address.
2899 *
2900 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2901 * Address passed in in NBO and returned in NBO.
2902 */
2903 int
2904 prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
2905 {
2906 struct prison *pr;
2907
2908 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2909 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2910
2911 pr = cred->cr_prison;
2912 if (!(pr->pr_flags & PR_IP4))
2913 return (0);
2914 mtx_lock(&pr->pr_mtx);
2915 if (!(pr->pr_flags & PR_IP4)) {
2916 mtx_unlock(&pr->pr_mtx);
2917 return (0);
2918 }
2919 if (pr->pr_ip4 == NULL) {
2920 mtx_unlock(&pr->pr_mtx);
2921 return (EAFNOSUPPORT);
2922 }
2923
2924 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) {
2925 ia->s_addr = pr->pr_ip4[0].s_addr;
2926 mtx_unlock(&pr->pr_mtx);
2927 return (0);
2928 }
2929
2930 /*
2931 * Return success because nothing had to be changed.
2932 */
2933 mtx_unlock(&pr->pr_mtx);
2934 return (0);
2935 }
2936
2937 /*
2938 * Check if given address belongs to the jail referenced by cred/prison.
2939 *
2940 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2941 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2942 * doesn't allow IPv4. Address passed in in NBO.
2943 */
2944 static int
2945 _prison_check_ip4(struct prison *pr, struct in_addr *ia)
2946 {
2947 int i, a, z, d;
2948
2949 /*
2950 * Check the primary IP.
2951 */
2952 if (pr->pr_ip4[0].s_addr == ia->s_addr)
2953 return (0);
2954
2955 /*
2956 * All the other IPs are sorted so we can do a binary search.
2957 */
2958 a = 0;
2959 z = pr->pr_ip4s - 2;
2960 while (a <= z) {
2961 i = (a + z) / 2;
2962 d = qcmp_v4(&pr->pr_ip4[i+1], ia);
2963 if (d > 0)
2964 z = i - 1;
2965 else if (d < 0)
2966 a = i + 1;
2967 else
2968 return (0);
2969 }
2970
2971 return (EADDRNOTAVAIL);
2972 }
2973
2974 int
2975 prison_check_ip4(struct ucred *cred, struct in_addr *ia)
2976 {
2977 struct prison *pr;
2978 int error;
2979
2980 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2981 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2982
2983 pr = cred->cr_prison;
2984 if (!(pr->pr_flags & PR_IP4))
2985 return (0);
2986 mtx_lock(&pr->pr_mtx);
2987 if (!(pr->pr_flags & PR_IP4)) {
2988 mtx_unlock(&pr->pr_mtx);
2989 return (0);
2990 }
2991 if (pr->pr_ip4 == NULL) {
2992 mtx_unlock(&pr->pr_mtx);
2993 return (EAFNOSUPPORT);
2994 }
2995
2996 error = _prison_check_ip4(pr, ia);
2997 mtx_unlock(&pr->pr_mtx);
2998 return (error);
2999 }
3000 #endif
3001
3002 #ifdef INET6
3003 static int
3004 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
3005 {
3006 int ii, ij, used;
3007 struct prison *ppr;
3008
3009 ppr = pr->pr_parent;
3010 if (!(pr->pr_flags & PR_IP6_USER)) {
3011 /* This has no user settings, so just copy the parent's list. */
3012 if (pr->pr_ip6s < ppr->pr_ip6s) {
3013 /*
3014 * There's no room for the parent's list. Use the
3015 * new list buffer, which is assumed to be big enough
3016 * (if it was passed). If there's no buffer, try to
3017 * allocate one.
3018 */
3019 used = 1;
3020 if (newip6 == NULL) {
3021 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
3022 M_PRISON, M_NOWAIT);
3023 if (newip6 != NULL)
3024 used = 0;
3025 }
3026 if (newip6 != NULL) {
3027 bcopy(ppr->pr_ip6, newip6,
3028 ppr->pr_ip6s * sizeof(*newip6));
3029 free(pr->pr_ip6, M_PRISON);
3030 pr->pr_ip6 = newip6;
3031 pr->pr_ip6s = ppr->pr_ip6s;
3032 }
3033 return (used);
3034 }
3035 pr->pr_ip6s = ppr->pr_ip6s;
3036 if (pr->pr_ip6s > 0)
3037 bcopy(ppr->pr_ip6, pr->pr_ip6,
3038 pr->pr_ip6s * sizeof(*newip6));
3039 else if (pr->pr_ip6 != NULL) {
3040 free(pr->pr_ip6, M_PRISON);
3041 pr->pr_ip6 = NULL;
3042 }
3043 } else if (pr->pr_ip6s > 0) {
3044 /* Remove addresses that aren't in the parent. */
3045 for (ij = 0; ij < ppr->pr_ip6s; ij++)
3046 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
3047 &ppr->pr_ip6[ij]))
3048 break;
3049 if (ij < ppr->pr_ip6s)
3050 ii = 1;
3051 else {
3052 bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
3053 --pr->pr_ip6s * sizeof(*pr->pr_ip6));
3054 ii = 0;
3055 }
3056 for (ij = 1; ii < pr->pr_ip6s; ) {
3057 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
3058 &ppr->pr_ip6[0])) {
3059 ii++;
3060 continue;
3061 }
3062 switch (ij >= ppr->pr_ip4s ? -1 :
3063 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
3064 case -1:
3065 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
3066 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
3067 break;
3068 case 0:
3069 ii++;
3070 ij++;
3071 break;
3072 case 1:
3073 ij++;
3074 break;
3075 }
3076 }
3077 if (pr->pr_ip6s == 0) {
3078 pr->pr_flags |= PR_IP6_DISABLE;
3079 free(pr->pr_ip6, M_PRISON);
3080 pr->pr_ip6 = NULL;
3081 }
3082 }
3083 return 0;
3084 }
3085
3086 /*
3087 * Pass back primary IPv6 address for this jail.
3088 *
3089 * If not restricted return success but do not alter the address. Caller has
3090 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
3091 *
3092 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3093 */
3094 int
3095 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
3096 {
3097 struct prison *pr;
3098
3099 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3100 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3101
3102 pr = cred->cr_prison;
3103 if (!(pr->pr_flags & PR_IP6))
3104 return (0);
3105 mtx_lock(&pr->pr_mtx);
3106 if (!(pr->pr_flags & PR_IP6)) {
3107 mtx_unlock(&pr->pr_mtx);
3108 return (0);
3109 }
3110 if (pr->pr_ip6 == NULL) {
3111 mtx_unlock(&pr->pr_mtx);
3112 return (EAFNOSUPPORT);
3113 }
3114
3115 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3116 mtx_unlock(&pr->pr_mtx);
3117 return (0);
3118 }
3119
3120 /*
3121 * Return 1 if we should do proper source address selection or are not jailed.
3122 * We will return 0 if we should bypass source address selection in favour
3123 * of the primary jail IPv6 address. Only in this case *ia will be updated and
3124 * returned in NBO.
3125 * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
3126 */
3127 int
3128 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
3129 {
3130 struct prison *pr;
3131 struct in6_addr lia6;
3132 int error;
3133
3134 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3135 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3136
3137 if (!jailed(cred))
3138 return (1);
3139
3140 pr = cred->cr_prison;
3141 if (pr->pr_flags & PR_IP6_SADDRSEL)
3142 return (1);
3143
3144 lia6 = in6addr_any;
3145 error = prison_get_ip6(cred, &lia6);
3146 if (error)
3147 return (error);
3148 if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
3149 return (1);
3150
3151 bcopy(&lia6, ia6, sizeof(struct in6_addr));
3152 return (0);
3153 }
3154
3155 /*
3156 * Return true if pr1 and pr2 have the same IPv6 address restrictions.
3157 */
3158 int
3159 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
3160 {
3161
3162 if (pr1 == pr2)
3163 return (1);
3164
3165 while (pr1 != &prison0 &&
3166 #ifdef VIMAGE
3167 !(pr1->pr_flags & PR_VNET) &&
3168 #endif
3169 !(pr1->pr_flags & PR_IP6_USER))
3170 pr1 = pr1->pr_parent;
3171 while (pr2 != &prison0 &&
3172 #ifdef VIMAGE
3173 !(pr2->pr_flags & PR_VNET) &&
3174 #endif
3175 !(pr2->pr_flags & PR_IP6_USER))
3176 pr2 = pr2->pr_parent;
3177 return (pr1 == pr2);
3178 }
3179
3180 /*
3181 * Make sure our (source) address is set to something meaningful to this jail.
3182 *
3183 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
3184 * when needed while binding.
3185 *
3186 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3187 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3188 * doesn't allow IPv6.
3189 */
3190 int
3191 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
3192 {
3193 struct prison *pr;
3194 int error;
3195
3196 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3197 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3198
3199 pr = cred->cr_prison;
3200 if (!(pr->pr_flags & PR_IP6))
3201 return (0);
3202 mtx_lock(&pr->pr_mtx);
3203 if (!(pr->pr_flags & PR_IP6)) {
3204 mtx_unlock(&pr->pr_mtx);
3205 return (0);
3206 }
3207 if (pr->pr_ip6 == NULL) {
3208 mtx_unlock(&pr->pr_mtx);
3209 return (EAFNOSUPPORT);
3210 }
3211
3212 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3213 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3214 mtx_unlock(&pr->pr_mtx);
3215 return (0);
3216 }
3217
3218 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
3219 /*
3220 * In case there is only 1 IPv6 address, and v6only is true,
3221 * then bind directly.
3222 */
3223 if (v6only != 0 && pr->pr_ip6s == 1)
3224 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3225 mtx_unlock(&pr->pr_mtx);
3226 return (0);
3227 }
3228
3229 error = _prison_check_ip6(pr, ia6);
3230 mtx_unlock(&pr->pr_mtx);
3231 return (error);
3232 }
3233
3234 /*
3235 * Rewrite destination address in case we will connect to loopback address.
3236 *
3237 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3238 */
3239 int
3240 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
3241 {
3242 struct prison *pr;
3243
3244 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3245 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3246
3247 pr = cred->cr_prison;
3248 if (!(pr->pr_flags & PR_IP6))
3249 return (0);
3250 mtx_lock(&pr->pr_mtx);
3251 if (!(pr->pr_flags & PR_IP6)) {
3252 mtx_unlock(&pr->pr_mtx);
3253 return (0);
3254 }
3255 if (pr->pr_ip6 == NULL) {
3256 mtx_unlock(&pr->pr_mtx);
3257 return (EAFNOSUPPORT);
3258 }
3259
3260 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3261 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3262 mtx_unlock(&pr->pr_mtx);
3263 return (0);
3264 }
3265
3266 /*
3267 * Return success because nothing had to be changed.
3268 */
3269 mtx_unlock(&pr->pr_mtx);
3270 return (0);
3271 }
3272
3273 /*
3274 * Check if given address belongs to the jail referenced by cred/prison.
3275 *
3276 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3277 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3278 * doesn't allow IPv6.
3279 */
3280 static int
3281 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6)
3282 {
3283 int i, a, z, d;
3284
3285 /*
3286 * Check the primary IP.
3287 */
3288 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
3289 return (0);
3290
3291 /*
3292 * All the other IPs are sorted so we can do a binary search.
3293 */
3294 a = 0;
3295 z = pr->pr_ip6s - 2;
3296 while (a <= z) {
3297 i = (a + z) / 2;
3298 d = qcmp_v6(&pr->pr_ip6[i+1], ia6);
3299 if (d > 0)
3300 z = i - 1;
3301 else if (d < 0)
3302 a = i + 1;
3303 else
3304 return (0);
3305 }
3306
3307 return (EADDRNOTAVAIL);
3308 }
3309
3310 int
3311 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6)
3312 {
3313 struct prison *pr;
3314 int error;
3315
3316 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3317 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3318
3319 pr = cred->cr_prison;
3320 if (!(pr->pr_flags & PR_IP6))
3321 return (0);
3322 mtx_lock(&pr->pr_mtx);
3323 if (!(pr->pr_flags & PR_IP6)) {
3324 mtx_unlock(&pr->pr_mtx);
3325 return (0);
3326 }
3327 if (pr->pr_ip6 == NULL) {
3328 mtx_unlock(&pr->pr_mtx);
3329 return (EAFNOSUPPORT);
3330 }
3331
3332 error = _prison_check_ip6(pr, ia6);
3333 mtx_unlock(&pr->pr_mtx);
3334 return (error);
3335 }
3336 #endif
3337
3338 /*
3339 * Check if a jail supports the given address family.
3340 *
3341 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
3342 * if not.
3343 */
3344 int
3345 prison_check_af(struct ucred *cred, int af)
3346 {
3347 struct prison *pr;
3348 int error;
3349
3350 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3351
3352 pr = cred->cr_prison;
3353 #ifdef VIMAGE
3354 /* Prisons with their own network stack are not limited. */
3355 if (prison_owns_vnet(cred))
3356 return (0);
3357 #endif
3358
3359 error = 0;
3360 switch (af)
3361 {
3362 #ifdef INET
3363 case AF_INET:
3364 if (pr->pr_flags & PR_IP4)
3365 {
3366 mtx_lock(&pr->pr_mtx);
3367 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
3368 error = EAFNOSUPPORT;
3369 mtx_unlock(&pr->pr_mtx);
3370 }
3371 break;
3372 #endif
3373 #ifdef INET6
3374 case AF_INET6:
3375 if (pr->pr_flags & PR_IP6)
3376 {
3377 mtx_lock(&pr->pr_mtx);
3378 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
3379 error = EAFNOSUPPORT;
3380 mtx_unlock(&pr->pr_mtx);
3381 }
3382 break;
3383 #endif
3384 case AF_LOCAL:
3385 case AF_ROUTE:
3386 break;
3387 default:
3388 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
3389 error = EAFNOSUPPORT;
3390 }
3391 return (error);
3392 }
3393
3394 /*
3395 * Check if given address belongs to the jail referenced by cred (wrapper to
3396 * prison_check_ip[46]).
3397 *
3398 * Returns 0 if jail doesn't restrict the address family or if address belongs
3399 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
3400 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
3401 */
3402 int
3403 prison_if(struct ucred *cred, struct sockaddr *sa)
3404 {
3405 #ifdef INET
3406 struct sockaddr_in *sai;
3407 #endif
3408 #ifdef INET6
3409 struct sockaddr_in6 *sai6;
3410 #endif
3411 int error;
3412
3413 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3414 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
3415
3416 #ifdef VIMAGE
3417 if (prison_owns_vnet(cred))
3418 return (0);
3419 #endif
3420
3421 error = 0;
3422 switch (sa->sa_family)
3423 {
3424 #ifdef INET
3425 case AF_INET:
3426 sai = (struct sockaddr_in *)sa;
3427 error = prison_check_ip4(cred, &sai->sin_addr);
3428 break;
3429 #endif
3430 #ifdef INET6
3431 case AF_INET6:
3432 sai6 = (struct sockaddr_in6 *)sa;
3433 error = prison_check_ip6(cred, &sai6->sin6_addr);
3434 break;
3435 #endif
3436 default:
3437 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
3438 error = EAFNOSUPPORT;
3439 }
3440 return (error);
3441 }
3442
3443 /*
3444 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
3445 */
3446 int
3447 prison_check(struct ucred *cred1, struct ucred *cred2)
3448 {
3449
3450 return ((cred1->cr_prison == cred2->cr_prison ||
3451 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
3452 }
3453
3454 /*
3455 * Return 1 if p2 is a child of p1, otherwise 0.
3456 */
3457 int
3458 prison_ischild(struct prison *pr1, struct prison *pr2)
3459 {
3460
3461 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
3462 if (pr1 == pr2)
3463 return (1);
3464 return (0);
3465 }
3466
3467 /*
3468 * Return 1 if the passed credential is in a jail, otherwise 0.
3469 */
3470 int
3471 jailed(struct ucred *cred)
3472 {
3473
3474 return (cred->cr_prison != &prison0);
3475 }
3476
3477 /*
3478 * Return 1 if the passed credential is in a jail and that jail does not
3479 * have its own virtual network stack, otherwise 0.
3480 */
3481 int
3482 jailed_without_vnet(struct ucred *cred)
3483 {
3484
3485 if (!jailed(cred))
3486 return (0);
3487 #ifdef VIMAGE
3488 if (prison_owns_vnet(cred))
3489 return (0);
3490 #endif
3491
3492 return (1);
3493 }
3494
3495 /*
3496 * Return the correct hostname (domainname, et al) for the passed credential.
3497 */
3498 void
3499 getcredhostname(struct ucred *cred, char *buf, size_t size)
3500 {
3501 struct prison *pr;
3502
3503 /*
3504 * A NULL credential can be used to shortcut to the physical
3505 * system's hostname.
3506 */
3507 pr = (cred != NULL) ? cred->cr_prison : &prison0;
3508 mtx_lock(&pr->pr_mtx);
3509 strlcpy(buf, pr->pr_hostname, size);
3510 mtx_unlock(&pr->pr_mtx);
3511 }
3512
3513 void
3514 getcreddomainname(struct ucred *cred, char *buf, size_t size)
3515 {
3516
3517 mtx_lock(&cred->cr_prison->pr_mtx);
3518 strlcpy(buf, cred->cr_prison->pr_domainname, size);
3519 mtx_unlock(&cred->cr_prison->pr_mtx);
3520 }
3521
3522 void
3523 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
3524 {
3525
3526 mtx_lock(&cred->cr_prison->pr_mtx);
3527 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
3528 mtx_unlock(&cred->cr_prison->pr_mtx);
3529 }
3530
3531 void
3532 getcredhostid(struct ucred *cred, unsigned long *hostid)
3533 {
3534
3535 mtx_lock(&cred->cr_prison->pr_mtx);
3536 *hostid = cred->cr_prison->pr_hostid;
3537 mtx_unlock(&cred->cr_prison->pr_mtx);
3538 }
3539
3540 #ifdef VIMAGE
3541 /*
3542 * Determine whether the prison represented by cred owns
3543 * its vnet rather than having it inherited.
3544 *
3545 * Returns 1 in case the prison owns the vnet, 0 otherwise.
3546 */
3547 int
3548 prison_owns_vnet(struct ucred *cred)
3549 {
3550
3551 /*
3552 * vnets cannot be added/removed after jail creation,
3553 * so no need to lock here.
3554 */
3555 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
3556 }
3557 #endif
3558
3559 /*
3560 * Determine whether the subject represented by cred can "see"
3561 * status of a mount point.
3562 * Returns: 0 for permitted, ENOENT otherwise.
3563 * XXX: This function should be called cr_canseemount() and should be
3564 * placed in kern_prot.c.
3565 */
3566 int
3567 prison_canseemount(struct ucred *cred, struct mount *mp)
3568 {
3569 struct prison *pr;
3570 struct statfs *sp;
3571 size_t len;
3572
3573 pr = cred->cr_prison;
3574 if (pr->pr_enforce_statfs == 0)
3575 return (0);
3576 if (pr->pr_root->v_mount == mp)
3577 return (0);
3578 if (pr->pr_enforce_statfs == 2)
3579 return (ENOENT);
3580 /*
3581 * If jail's chroot directory is set to "/" we should be able to see
3582 * all mount-points from inside a jail.
3583 * This is ugly check, but this is the only situation when jail's
3584 * directory ends with '/'.
3585 */
3586 if (strcmp(pr->pr_path, "/") == 0)
3587 return (0);
3588 len = strlen(pr->pr_path);
3589 sp = &mp->mnt_stat;
3590 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
3591 return (ENOENT);
3592 /*
3593 * Be sure that we don't have situation where jail's root directory
3594 * is "/some/path" and mount point is "/some/pathpath".
3595 */
3596 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
3597 return (ENOENT);
3598 return (0);
3599 }
3600
3601 void
3602 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
3603 {
3604 char jpath[MAXPATHLEN];
3605 struct prison *pr;
3606 size_t len;
3607
3608 pr = cred->cr_prison;
3609 if (pr->pr_enforce_statfs == 0)
3610 return;
3611 if (prison_canseemount(cred, mp) != 0) {
3612 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3613 strlcpy(sp->f_mntonname, "[restricted]",
3614 sizeof(sp->f_mntonname));
3615 return;
3616 }
3617 if (pr->pr_root->v_mount == mp) {
3618 /*
3619 * Clear current buffer data, so we are sure nothing from
3620 * the valid path left there.
3621 */
3622 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3623 *sp->f_mntonname = '/';
3624 return;
3625 }
3626 /*
3627 * If jail's chroot directory is set to "/" we should be able to see
3628 * all mount-points from inside a jail.
3629 */
3630 if (strcmp(pr->pr_path, "/") == 0)
3631 return;
3632 len = strlen(pr->pr_path);
3633 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
3634 /*
3635 * Clear current buffer data, so we are sure nothing from
3636 * the valid path left there.
3637 */
3638 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3639 if (*jpath == '\0') {
3640 /* Should never happen. */
3641 *sp->f_mntonname = '/';
3642 } else {
3643 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
3644 }
3645 }
3646
3647 /*
3648 * Check with permission for a specific privilege is granted within jail. We
3649 * have a specific list of accepted privileges; the rest are denied.
3650 */
3651 int
3652 prison_priv_check(struct ucred *cred, int priv)
3653 {
3654
3655 if (!jailed(cred))
3656 return (0);
3657
3658 #ifdef VIMAGE
3659 /*
3660 * Privileges specific to prisons with a virtual network stack.
3661 * There might be a duplicate entry here in case the privilege
3662 * is only granted conditionally in the legacy jail case.
3663 */
3664 switch (priv) {
3665 #ifdef notyet
3666 /*
3667 * NFS-specific privileges.
3668 */
3669 case PRIV_NFS_DAEMON:
3670 case PRIV_NFS_LOCKD:
3671 #endif
3672 /*
3673 * Network stack privileges.
3674 */
3675 case PRIV_NET_BRIDGE:
3676 case PRIV_NET_GRE:
3677 case PRIV_NET_BPF:
3678 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
3679 case PRIV_NET_ROUTE:
3680 case PRIV_NET_TAP:
3681 case PRIV_NET_SETIFMTU:
3682 case PRIV_NET_SETIFFLAGS:
3683 case PRIV_NET_SETIFCAP:
3684 case PRIV_NET_SETIFDESCR:
3685 case PRIV_NET_SETIFNAME :
3686 case PRIV_NET_SETIFMETRIC:
3687 case PRIV_NET_SETIFPHYS:
3688 case PRIV_NET_SETIFMAC:
3689 case PRIV_NET_ADDMULTI:
3690 case PRIV_NET_DELMULTI:
3691 case PRIV_NET_HWIOCTL:
3692 case PRIV_NET_SETLLADDR:
3693 case PRIV_NET_ADDIFGROUP:
3694 case PRIV_NET_DELIFGROUP:
3695 case PRIV_NET_IFCREATE:
3696 case PRIV_NET_IFDESTROY:
3697 case PRIV_NET_ADDIFADDR:
3698 case PRIV_NET_DELIFADDR:
3699 case PRIV_NET_LAGG:
3700 case PRIV_NET_GIF:
3701 case PRIV_NET_SETIFVNET:
3702 case PRIV_NET_SETIFFIB:
3703
3704 /*
3705 * 802.11-related privileges.
3706 */
3707 case PRIV_NET80211_GETKEY:
3708 #ifdef notyet
3709 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */
3710 #endif
3711
3712 #ifdef notyet
3713 /*
3714 * AppleTalk privileges.
3715 */
3716 case PRIV_NETATALK_RESERVEDPORT:
3717
3718 /*
3719 * ATM privileges.
3720 */
3721 case PRIV_NETATM_CFG:
3722 case PRIV_NETATM_ADD:
3723 case PRIV_NETATM_DEL:
3724 case PRIV_NETATM_SET:
3725
3726 /*
3727 * Bluetooth privileges.
3728 */
3729 case PRIV_NETBLUETOOTH_RAW:
3730 #endif
3731
3732 /*
3733 * Netgraph and netgraph module privileges.
3734 */
3735 case PRIV_NETGRAPH_CONTROL:
3736 #ifdef notyet
3737 case PRIV_NETGRAPH_TTY:
3738 #endif
3739
3740 /*
3741 * IPv4 and IPv6 privileges.
3742 */
3743 case PRIV_NETINET_IPFW:
3744 case PRIV_NETINET_DIVERT:
3745 case PRIV_NETINET_PF:
3746 case PRIV_NETINET_DUMMYNET:
3747 case PRIV_NETINET_CARP:
3748 case PRIV_NETINET_MROUTE:
3749 case PRIV_NETINET_RAW:
3750 case PRIV_NETINET_ADDRCTRL6:
3751 case PRIV_NETINET_ND6:
3752 case PRIV_NETINET_SCOPE6:
3753 case PRIV_NETINET_ALIFETIME6:
3754 case PRIV_NETINET_IPSEC:
3755 case PRIV_NETINET_BINDANY:
3756
3757 #ifdef notyet
3758 /*
3759 * IPX/SPX privileges.
3760 */
3761 case PRIV_NETIPX_RESERVEDPORT:
3762 case PRIV_NETIPX_RAW:
3763
3764 /*
3765 * NCP privileges.
3766 */
3767 case PRIV_NETNCP:
3768
3769 /*
3770 * SMB privileges.
3771 */
3772 case PRIV_NETSMB:
3773 #endif
3774
3775 /*
3776 * No default: or deny here.
3777 * In case of no permit fall through to next switch().
3778 */
3779 if (cred->cr_prison->pr_flags & PR_VNET)
3780 return (0);
3781 }
3782 #endif /* VIMAGE */
3783
3784 switch (priv) {
3785
3786 /*
3787 * Allow ktrace privileges for root in jail.
3788 */
3789 case PRIV_KTRACE:
3790
3791 #if 0
3792 /*
3793 * Allow jailed processes to configure audit identity and
3794 * submit audit records (login, etc). In the future we may
3795 * want to further refine the relationship between audit and
3796 * jail.
3797 */
3798 case PRIV_AUDIT_GETAUDIT:
3799 case PRIV_AUDIT_SETAUDIT:
3800 case PRIV_AUDIT_SUBMIT:
3801 #endif
3802
3803 /*
3804 * Allow jailed processes to manipulate process UNIX
3805 * credentials in any way they see fit.
3806 */
3807 case PRIV_CRED_SETUID:
3808 case PRIV_CRED_SETEUID:
3809 case PRIV_CRED_SETGID:
3810 case PRIV_CRED_SETEGID:
3811 case PRIV_CRED_SETGROUPS:
3812 case PRIV_CRED_SETREUID:
3813 case PRIV_CRED_SETREGID:
3814 case PRIV_CRED_SETRESUID:
3815 case PRIV_CRED_SETRESGID:
3816
3817 /*
3818 * Jail implements visibility constraints already, so allow
3819 * jailed root to override uid/gid-based constraints.
3820 */
3821 case PRIV_SEEOTHERGIDS:
3822 case PRIV_SEEOTHERUIDS:
3823
3824 /*
3825 * Jail implements inter-process debugging limits already, so
3826 * allow jailed root various debugging privileges.
3827 */
3828 case PRIV_DEBUG_DIFFCRED:
3829 case PRIV_DEBUG_SUGID:
3830 case PRIV_DEBUG_UNPRIV:
3831
3832 /*
3833 * Allow jail to set various resource limits and login
3834 * properties, and for now, exceed process resource limits.
3835 */
3836 case PRIV_PROC_LIMIT:
3837 case PRIV_PROC_SETLOGIN:
3838 case PRIV_PROC_SETRLIMIT:
3839
3840 /*
3841 * System V and POSIX IPC privileges are granted in jail.
3842 */
3843 case PRIV_IPC_READ:
3844 case PRIV_IPC_WRITE:
3845 case PRIV_IPC_ADMIN:
3846 case PRIV_IPC_MSGSIZE:
3847 case PRIV_MQ_ADMIN:
3848
3849 /*
3850 * Jail operations within a jail work on child jails.
3851 */
3852 case PRIV_JAIL_ATTACH:
3853 case PRIV_JAIL_SET:
3854 case PRIV_JAIL_REMOVE:
3855
3856 /*
3857 * Jail implements its own inter-process limits, so allow
3858 * root processes in jail to change scheduling on other
3859 * processes in the same jail. Likewise for signalling.
3860 */
3861 case PRIV_SCHED_DIFFCRED:
3862 case PRIV_SCHED_CPUSET:
3863 case PRIV_SIGNAL_DIFFCRED:
3864 case PRIV_SIGNAL_SUGID:
3865
3866 /*
3867 * Allow jailed processes to write to sysctls marked as jail
3868 * writable.
3869 */
3870 case PRIV_SYSCTL_WRITEJAIL:
3871
3872 /*
3873 * Allow root in jail to manage a variety of quota
3874 * properties. These should likely be conditional on a
3875 * configuration option.
3876 */
3877 case PRIV_VFS_GETQUOTA:
3878 case PRIV_VFS_SETQUOTA:
3879
3880 /*
3881 * Since Jail relies on chroot() to implement file system
3882 * protections, grant many VFS privileges to root in jail.
3883 * Be careful to exclude mount-related and NFS-related
3884 * privileges.
3885 */
3886 case PRIV_VFS_READ:
3887 case PRIV_VFS_WRITE:
3888 case PRIV_VFS_ADMIN:
3889 case PRIV_VFS_EXEC:
3890 case PRIV_VFS_LOOKUP:
3891 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
3892 case PRIV_VFS_CHFLAGS_DEV:
3893 case PRIV_VFS_CHOWN:
3894 case PRIV_VFS_CHROOT:
3895 case PRIV_VFS_RETAINSUGID:
3896 case PRIV_VFS_FCHROOT:
3897 case PRIV_VFS_LINK:
3898 case PRIV_VFS_SETGID:
3899 case PRIV_VFS_STAT:
3900 case PRIV_VFS_STICKYFILE:
3901 return (0);
3902
3903 /*
3904 * Depending on the global setting, allow privilege of
3905 * setting system flags.
3906 */
3907 case PRIV_VFS_SYSFLAGS:
3908 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
3909 return (0);
3910 else
3911 return (EPERM);
3912
3913 /*
3914 * Depending on the global setting, allow privilege of
3915 * mounting/unmounting file systems.
3916 */
3917 case PRIV_VFS_MOUNT:
3918 case PRIV_VFS_UNMOUNT:
3919 case PRIV_VFS_MOUNT_NONUSER:
3920 case PRIV_VFS_MOUNT_OWNER:
3921 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT &&
3922 cred->cr_prison->pr_enforce_statfs < 2)
3923 return (0);
3924 else
3925 return (EPERM);
3926
3927 /*
3928 * Allow jailed root to bind reserved ports and reuse in-use
3929 * ports.
3930 */
3931 case PRIV_NETINET_RESERVEDPORT:
3932 case PRIV_NETINET_REUSEPORT:
3933 return (0);
3934
3935 /*
3936 * Allow jailed root to set certian IPv4/6 (option) headers.
3937 */
3938 case PRIV_NETINET_SETHDROPTS:
3939 return (0);
3940
3941 /*
3942 * Conditionally allow creating raw sockets in jail.
3943 */
3944 case PRIV_NETINET_RAW:
3945 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
3946 return (0);
3947 else
3948 return (EPERM);
3949
3950 /*
3951 * Since jail implements its own visibility limits on netstat
3952 * sysctls, allow getcred. This allows identd to work in
3953 * jail.
3954 */
3955 case PRIV_NETINET_GETCRED:
3956 return (0);
3957
3958 /*
3959 * Allow jailed root to set loginclass.
3960 */
3961 case PRIV_PROC_SETLOGINCLASS:
3962 return (0);
3963
3964 default:
3965 /*
3966 * In all remaining cases, deny the privilege request. This
3967 * includes almost all network privileges, many system
3968 * configuration privileges.
3969 */
3970 return (EPERM);
3971 }
3972 }
3973
3974 /*
3975 * Return the part of pr2's name that is relative to pr1, or the whole name
3976 * if it does not directly follow.
3977 */
3978
3979 char *
3980 prison_name(struct prison *pr1, struct prison *pr2)
3981 {
3982 char *name;
3983
3984 /* Jails see themselves as "" (if they see themselves at all). */
3985 if (pr1 == pr2)
3986 return "";
3987 name = pr2->pr_name;
3988 if (prison_ischild(pr1, pr2)) {
3989 /*
3990 * pr1 isn't locked (and allprison_lock may not be either)
3991 * so its length can't be counted on. But the number of dots
3992 * can be counted on - and counted.
3993 */
3994 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
3995 name = strchr(name, '.') + 1;
3996 }
3997 return (name);
3998 }
3999
4000 /*
4001 * Return the part of pr2's path that is relative to pr1, or the whole path
4002 * if it does not directly follow.
4003 */
4004 static char *
4005 prison_path(struct prison *pr1, struct prison *pr2)
4006 {
4007 char *path1, *path2;
4008 int len1;
4009
4010 path1 = pr1->pr_path;
4011 path2 = pr2->pr_path;
4012 if (!strcmp(path1, "/"))
4013 return (path2);
4014 len1 = strlen(path1);
4015 if (strncmp(path1, path2, len1))
4016 return (path2);
4017 if (path2[len1] == '\0')
4018 return "/";
4019 if (path2[len1] == '/')
4020 return (path2 + len1);
4021 return (path2);
4022 }
4023
4024
4025 /*
4026 * Jail-related sysctls.
4027 */
4028 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
4029 "Jails");
4030
4031 static int
4032 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
4033 {
4034 struct xprison *xp;
4035 struct prison *pr, *cpr;
4036 #ifdef INET
4037 struct in_addr *ip4 = NULL;
4038 int ip4s = 0;
4039 #endif
4040 #ifdef INET6
4041 struct in6_addr *ip6 = NULL;
4042 int ip6s = 0;
4043 #endif
4044 int descend, error;
4045
4046 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
4047 pr = req->td->td_ucred->cr_prison;
4048 error = 0;
4049 sx_slock(&allprison_lock);
4050 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
4051 #if defined(INET) || defined(INET6)
4052 again:
4053 #endif
4054 mtx_lock(&cpr->pr_mtx);
4055 #ifdef INET
4056 if (cpr->pr_ip4s > 0) {
4057 if (ip4s < cpr->pr_ip4s) {
4058 ip4s = cpr->pr_ip4s;
4059 mtx_unlock(&cpr->pr_mtx);
4060 ip4 = realloc(ip4, ip4s *
4061 sizeof(struct in_addr), M_TEMP, M_WAITOK);
4062 goto again;
4063 }
4064 bcopy(cpr->pr_ip4, ip4,
4065 cpr->pr_ip4s * sizeof(struct in_addr));
4066 }
4067 #endif
4068 #ifdef INET6
4069 if (cpr->pr_ip6s > 0) {
4070 if (ip6s < cpr->pr_ip6s) {
4071 ip6s = cpr->pr_ip6s;
4072 mtx_unlock(&cpr->pr_mtx);
4073 ip6 = realloc(ip6, ip6s *
4074 sizeof(struct in6_addr), M_TEMP, M_WAITOK);
4075 goto again;
4076 }
4077 bcopy(cpr->pr_ip6, ip6,
4078 cpr->pr_ip6s * sizeof(struct in6_addr));
4079 }
4080 #endif
4081 if (cpr->pr_ref == 0) {
4082 mtx_unlock(&cpr->pr_mtx);
4083 continue;
4084 }
4085 bzero(xp, sizeof(*xp));
4086 xp->pr_version = XPRISON_VERSION;
4087 xp->pr_id = cpr->pr_id;
4088 xp->pr_state = cpr->pr_uref > 0
4089 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
4090 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
4091 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
4092 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
4093 #ifdef INET
4094 xp->pr_ip4s = cpr->pr_ip4s;
4095 #endif
4096 #ifdef INET6
4097 xp->pr_ip6s = cpr->pr_ip6s;
4098 #endif
4099 mtx_unlock(&cpr->pr_mtx);
4100 error = SYSCTL_OUT(req, xp, sizeof(*xp));
4101 if (error)
4102 break;
4103 #ifdef INET
4104 if (xp->pr_ip4s > 0) {
4105 error = SYSCTL_OUT(req, ip4,
4106 xp->pr_ip4s * sizeof(struct in_addr));
4107 if (error)
4108 break;
4109 }
4110 #endif
4111 #ifdef INET6
4112 if (xp->pr_ip6s > 0) {
4113 error = SYSCTL_OUT(req, ip6,
4114 xp->pr_ip6s * sizeof(struct in6_addr));
4115 if (error)
4116 break;
4117 }
4118 #endif
4119 }
4120 sx_sunlock(&allprison_lock);
4121 free(xp, M_TEMP);
4122 #ifdef INET
4123 free(ip4, M_TEMP);
4124 #endif
4125 #ifdef INET6
4126 free(ip6, M_TEMP);
4127 #endif
4128 return (error);
4129 }
4130
4131 SYSCTL_OID(_security_jail, OID_AUTO, list,
4132 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4133 sysctl_jail_list, "S", "List of active jails");
4134
4135 static int
4136 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
4137 {
4138 int error, injail;
4139
4140 injail = jailed(req->td->td_ucred);
4141 error = SYSCTL_OUT(req, &injail, sizeof(injail));
4142
4143 return (error);
4144 }
4145
4146 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
4147 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4148 sysctl_jail_jailed, "I", "Process in jail?");
4149
4150 static int
4151 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
4152 {
4153 int error, havevnet;
4154 #ifdef VIMAGE
4155 struct ucred *cred = req->td->td_ucred;
4156
4157 havevnet = jailed(cred) && prison_owns_vnet(cred);
4158 #else
4159 havevnet = 0;
4160 #endif
4161 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
4162
4163 return (error);
4164 }
4165
4166 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
4167 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4168 sysctl_jail_vnet, "I", "Jail owns VNET?");
4169
4170 #if defined(INET) || defined(INET6)
4171 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
4172 &jail_max_af_ips, 0,
4173 "Number of IP addresses a jail may have at most per address family");
4174 #endif
4175
4176 /*
4177 * Default parameters for jail(2) compatability. For historical reasons,
4178 * the sysctl names have varying similarity to the parameter names. Prisons
4179 * just see their own parameters, and can't change them.
4180 */
4181 static int
4182 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
4183 {
4184 struct prison *pr;
4185 int allow, error, i;
4186
4187 pr = req->td->td_ucred->cr_prison;
4188 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
4189
4190 /* Get the current flag value, and convert it to a boolean. */
4191 i = (allow & arg2) ? 1 : 0;
4192 if (arg1 != NULL)
4193 i = !i;
4194 error = sysctl_handle_int(oidp, &i, 0, req);
4195 if (error || !req->newptr)
4196 return (error);
4197 i = i ? arg2 : 0;
4198 if (arg1 != NULL)
4199 i ^= arg2;
4200 /*
4201 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
4202 * for writing.
4203 */
4204 mtx_lock(&prison0.pr_mtx);
4205 jail_default_allow = (jail_default_allow & ~arg2) | i;
4206 mtx_unlock(&prison0.pr_mtx);
4207 return (0);
4208 }
4209
4210 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
4211 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4212 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
4213 "Processes in jail can set their hostnames");
4214 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
4215 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4216 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
4217 "Processes in jail are limited to creating UNIX/IP/route sockets only");
4218 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
4219 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4220 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
4221 "Processes in jail can use System V IPC primitives");
4222 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
4223 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4224 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
4225 "Prison root can create raw sockets");
4226 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
4227 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4228 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
4229 "Processes in jail can alter system file flags");
4230 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
4231 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4232 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
4233 "Processes in jail can mount/unmount jail-friendly file systems");
4234 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed,
4235 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4236 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I",
4237 "Processes in jail can mount the devfs file system");
4238 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed,
4239 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4240 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I",
4241 "Processes in jail can mount the nullfs file system");
4242 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed,
4243 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4244 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I",
4245 "Processes in jail can mount the procfs file system");
4246 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed,
4247 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4248 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I",
4249 "Processes in jail can mount the zfs file system");
4250
4251 static int
4252 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
4253 {
4254 struct prison *pr;
4255 int level, error;
4256
4257 pr = req->td->td_ucred->cr_prison;
4258 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
4259 error = sysctl_handle_int(oidp, &level, 0, req);
4260 if (error || !req->newptr)
4261 return (error);
4262 *(int *)arg1 = level;
4263 return (0);
4264 }
4265
4266 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
4267 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4268 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
4269 sysctl_jail_default_level, "I",
4270 "Processes in jail cannot see all mounted file systems");
4271
4272 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
4273 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
4274 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
4275 sysctl_jail_default_level, "I",
4276 "Ruleset for the devfs filesystem in jail");
4277
4278 /*
4279 * Nodes to describe jail parameters. Maximum length of string parameters
4280 * is returned in the string itself, and the other parameters exist merely
4281 * to make themselves and their types known.
4282 */
4283 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0,
4284 "Jail parameters");
4285
4286 int
4287 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
4288 {
4289 int i;
4290 long l;
4291 size_t s;
4292 char numbuf[12];
4293
4294 switch (oidp->oid_kind & CTLTYPE)
4295 {
4296 case CTLTYPE_LONG:
4297 case CTLTYPE_ULONG:
4298 l = 0;
4299 #ifdef SCTL_MASK32
4300 if (!(req->flags & SCTL_MASK32))
4301 #endif
4302 return (SYSCTL_OUT(req, &l, sizeof(l)));
4303 case CTLTYPE_INT:
4304 case CTLTYPE_UINT:
4305 i = 0;
4306 return (SYSCTL_OUT(req, &i, sizeof(i)));
4307 case CTLTYPE_STRING:
4308 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
4309 return
4310 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
4311 case CTLTYPE_STRUCT:
4312 s = (size_t)arg2;
4313 return (SYSCTL_OUT(req, &s, sizeof(s)));
4314 }
4315 return (0);
4316 }
4317
4318 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
4319 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
4320 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
4321 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
4322 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
4323 "I", "Jail secure level");
4324 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
4325 "I", "Jail cannot see all mounted file systems");
4326 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
4327 "I", "Ruleset for in-jail devfs mounts");
4328 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
4329 "B", "Jail persistence");
4330 #ifdef VIMAGE
4331 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
4332 "E,jailsys", "Virtual network stack");
4333 #endif
4334 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
4335 "B", "Jail is in the process of shutting down");
4336
4337 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
4338 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
4339 "I", "Current number of child jails");
4340 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
4341 "I", "Maximum number of child jails");
4342
4343 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
4344 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
4345 "Jail hostname");
4346 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
4347 "Jail NIS domainname");
4348 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
4349 "Jail host UUID");
4350 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
4351 "LU", "Jail host ID");
4352
4353 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
4354 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
4355
4356 #ifdef INET
4357 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
4358 "Jail IPv4 address virtualization");
4359 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
4360 "S,in_addr,a", "Jail IPv4 addresses");
4361 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4362 "B", "Do (not) use IPv4 source address selection rather than the "
4363 "primary jail IPv4 address.");
4364 #endif
4365 #ifdef INET6
4366 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
4367 "Jail IPv6 address virtualization");
4368 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
4369 "S,in6_addr,a", "Jail IPv6 addresses");
4370 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4371 "B", "Do (not) use IPv6 source address selection rather than the "
4372 "primary jail IPv6 address.");
4373 #endif
4374
4375 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
4376 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
4377 "B", "Jail may set hostname");
4378 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
4379 "B", "Jail may use SYSV IPC");
4380 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
4381 "B", "Jail may create raw sockets");
4382 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
4383 "B", "Jail may alter system file flags");
4384 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
4385 "B", "Jail may set file quotas");
4386 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
4387 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
4388
4389 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
4390 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
4391 "B", "Jail may mount/unmount jail-friendly file systems in general");
4392 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW,
4393 "B", "Jail may mount the devfs file system");
4394 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW,
4395 "B", "Jail may mount the nullfs file system");
4396 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW,
4397 "B", "Jail may mount the procfs file system");
4398 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW,
4399 "B", "Jail may mount the zfs file system");
4400
4401 void
4402 prison_racct_foreach(void (*callback)(struct racct *racct,
4403 void *arg2, void *arg3), void *arg2, void *arg3)
4404 {
4405 struct prison_racct *prr;
4406
4407 sx_slock(&allprison_lock);
4408 LIST_FOREACH(prr, &allprison_racct, prr_next)
4409 (callback)(prr->prr_racct, arg2, arg3);
4410 sx_sunlock(&allprison_lock);
4411 }
4412
4413 static struct prison_racct *
4414 prison_racct_find_locked(const char *name)
4415 {
4416 struct prison_racct *prr;
4417
4418 sx_assert(&allprison_lock, SA_XLOCKED);
4419
4420 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
4421 return (NULL);
4422
4423 LIST_FOREACH(prr, &allprison_racct, prr_next) {
4424 if (strcmp(name, prr->prr_name) != 0)
4425 continue;
4426
4427 /* Found prison_racct with a matching name? */
4428 prison_racct_hold(prr);
4429 return (prr);
4430 }
4431
4432 /* Add new prison_racct. */
4433 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
4434 racct_create(&prr->prr_racct);
4435
4436 strcpy(prr->prr_name, name);
4437 refcount_init(&prr->prr_refcount, 1);
4438 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
4439
4440 return (prr);
4441 }
4442
4443 struct prison_racct *
4444 prison_racct_find(const char *name)
4445 {
4446 struct prison_racct *prr;
4447
4448 sx_xlock(&allprison_lock);
4449 prr = prison_racct_find_locked(name);
4450 sx_xunlock(&allprison_lock);
4451 return (prr);
4452 }
4453
4454 void
4455 prison_racct_hold(struct prison_racct *prr)
4456 {
4457
4458 refcount_acquire(&prr->prr_refcount);
4459 }
4460
4461 static void
4462 prison_racct_free_locked(struct prison_racct *prr)
4463 {
4464
4465 sx_assert(&allprison_lock, SA_XLOCKED);
4466
4467 if (refcount_release(&prr->prr_refcount)) {
4468 racct_destroy(&prr->prr_racct);
4469 LIST_REMOVE(prr, prr_next);
4470 free(prr, M_PRISON_RACCT);
4471 }
4472 }
4473
4474 void
4475 prison_racct_free(struct prison_racct *prr)
4476 {
4477 int old;
4478
4479 sx_assert(&allprison_lock, SA_UNLOCKED);
4480
4481 old = prr->prr_refcount;
4482 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1))
4483 return;
4484
4485 sx_xlock(&allprison_lock);
4486 prison_racct_free_locked(prr);
4487 sx_xunlock(&allprison_lock);
4488 }
4489
4490 #ifdef RACCT
4491 static void
4492 prison_racct_attach(struct prison *pr)
4493 {
4494 struct prison_racct *prr;
4495
4496 sx_assert(&allprison_lock, SA_XLOCKED);
4497
4498 prr = prison_racct_find_locked(pr->pr_name);
4499 KASSERT(prr != NULL, ("cannot find prison_racct"));
4500
4501 pr->pr_prison_racct = prr;
4502 }
4503
4504 /*
4505 * Handle jail renaming. From the racct point of view, renaming means
4506 * moving from one prison_racct to another.
4507 */
4508 static void
4509 prison_racct_modify(struct prison *pr)
4510 {
4511 struct proc *p;
4512 struct ucred *cred;
4513 struct prison_racct *oldprr;
4514
4515 sx_slock(&allproc_lock);
4516 sx_xlock(&allprison_lock);
4517
4518 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
4519 sx_xunlock(&allprison_lock);
4520 sx_sunlock(&allproc_lock);
4521 return;
4522 }
4523
4524 oldprr = pr->pr_prison_racct;
4525 pr->pr_prison_racct = NULL;
4526
4527 prison_racct_attach(pr);
4528
4529 /*
4530 * Move resource utilisation records.
4531 */
4532 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
4533
4534 /*
4535 * Force rctl to reattach rules to processes.
4536 */
4537 FOREACH_PROC_IN_SYSTEM(p) {
4538 PROC_LOCK(p);
4539 cred = crhold(p->p_ucred);
4540 PROC_UNLOCK(p);
4541 racct_proc_ucred_changed(p, cred, cred);
4542 crfree(cred);
4543 }
4544
4545 sx_sunlock(&allproc_lock);
4546 prison_racct_free_locked(oldprr);
4547 sx_xunlock(&allprison_lock);
4548 }
4549
4550 static void
4551 prison_racct_detach(struct prison *pr)
4552 {
4553
4554 sx_assert(&allprison_lock, SA_UNLOCKED);
4555
4556 if (pr->pr_prison_racct == NULL)
4557 return;
4558 prison_racct_free(pr->pr_prison_racct);
4559 pr->pr_prison_racct = NULL;
4560 }
4561 #endif /* RACCT */
4562
4563 #ifdef DDB
4564
4565 static void
4566 db_show_prison(struct prison *pr)
4567 {
4568 int fi;
4569 #if defined(INET) || defined(INET6)
4570 int ii;
4571 #endif
4572 unsigned jsf;
4573 #ifdef INET6
4574 char ip6buf[INET6_ADDRSTRLEN];
4575 #endif
4576
4577 db_printf("prison %p:\n", pr);
4578 db_printf(" jid = %d\n", pr->pr_id);
4579 db_printf(" name = %s\n", pr->pr_name);
4580 db_printf(" parent = %p\n", pr->pr_parent);
4581 db_printf(" ref = %d\n", pr->pr_ref);
4582 db_printf(" uref = %d\n", pr->pr_uref);
4583 db_printf(" path = %s\n", pr->pr_path);
4584 db_printf(" cpuset = %d\n", pr->pr_cpuset
4585 ? pr->pr_cpuset->cs_id : -1);
4586 #ifdef VIMAGE
4587 db_printf(" vnet = %p\n", pr->pr_vnet);
4588 #endif
4589 db_printf(" root = %p\n", pr->pr_root);
4590 db_printf(" securelevel = %d\n", pr->pr_securelevel);
4591 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
4592 db_printf(" children.max = %d\n", pr->pr_childmax);
4593 db_printf(" children.cur = %d\n", pr->pr_childcount);
4594 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
4595 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
4596 db_printf(" flags = 0x%x", pr->pr_flags);
4597 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
4598 fi++)
4599 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi)))
4600 db_printf(" %s", pr_flag_names[fi]);
4601 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
4602 fi++) {
4603 jsf = pr->pr_flags &
4604 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
4605 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name,
4606 pr_flag_jailsys[fi].disable &&
4607 (jsf == pr_flag_jailsys[fi].disable) ? "disable"
4608 : (jsf == pr_flag_jailsys[fi].new) ? "new"
4609 : "inherit");
4610 }
4611 db_printf(" allow = 0x%x", pr->pr_allow);
4612 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
4613 fi++)
4614 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi)))
4615 db_printf(" %s", pr_allow_names[fi]);
4616 db_printf("\n");
4617 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
4618 db_printf(" host.hostname = %s\n", pr->pr_hostname);
4619 db_printf(" host.domainname = %s\n", pr->pr_domainname);
4620 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
4621 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
4622 #ifdef INET
4623 db_printf(" ip4s = %d\n", pr->pr_ip4s);
4624 for (ii = 0; ii < pr->pr_ip4s; ii++)
4625 db_printf(" %s %s\n",
4626 ii == 0 ? "ip4.addr =" : " ",
4627 inet_ntoa(pr->pr_ip4[ii]));
4628 #endif
4629 #ifdef INET6
4630 db_printf(" ip6s = %d\n", pr->pr_ip6s);
4631 for (ii = 0; ii < pr->pr_ip6s; ii++)
4632 db_printf(" %s %s\n",
4633 ii == 0 ? "ip6.addr =" : " ",
4634 ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
4635 #endif
4636 }
4637
4638 DB_SHOW_COMMAND(prison, db_show_prison_command)
4639 {
4640 struct prison *pr;
4641
4642 if (!have_addr) {
4643 /*
4644 * Show all prisons in the list, and prison0 which is not
4645 * listed.
4646 */
4647 db_show_prison(&prison0);
4648 if (!db_pager_quit) {
4649 TAILQ_FOREACH(pr, &allprison, pr_list) {
4650 db_show_prison(pr);
4651 if (db_pager_quit)
4652 break;
4653 }
4654 }
4655 return;
4656 }
4657
4658 if (addr == 0)
4659 pr = &prison0;
4660 else {
4661 /* Look for a prison with the ID and with references. */
4662 TAILQ_FOREACH(pr, &allprison, pr_list)
4663 if (pr->pr_id == addr && pr->pr_ref > 0)
4664 break;
4665 if (pr == NULL)
4666 /* Look again, without requiring a reference. */
4667 TAILQ_FOREACH(pr, &allprison, pr_list)
4668 if (pr->pr_id == addr)
4669 break;
4670 if (pr == NULL)
4671 /* Assume address points to a valid prison. */
4672 pr = (struct prison *)addr;
4673 }
4674 db_show_prison(pr);
4675 }
4676
4677 #endif /* DDB */
Cache object: cb9e1d4fe8ec7eeea74ca718ff7da6cd
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