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/9.0/sys/kern/kern_jail.c 225617 2011-09-16 13:58:51Z kmacy $");
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 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_childmax = JAIL_MAX,
107 .pr_hostuuid = DEFAULT_HOSTUUID,
108 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
109 #ifdef VIMAGE
110 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
111 #else
112 .pr_flags = PR_HOST|_PR_IP_SADDRSEL,
113 #endif
114 .pr_allow = PR_ALLOW_ALL,
115 };
116 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
117
118 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */
119 struct sx allprison_lock;
120 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
121 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
122 LIST_HEAD(, prison_racct) allprison_racct;
123 int lastprid = 0;
124
125 static int do_jail_attach(struct thread *td, struct prison *pr);
126 static void prison_complete(void *context, int pending);
127 static void prison_deref(struct prison *pr, int flags);
128 static char *prison_path(struct prison *pr1, struct prison *pr2);
129 static void prison_remove_one(struct prison *pr);
130 #ifdef RACCT
131 static void prison_racct_attach(struct prison *pr);
132 static void prison_racct_detach(struct prison *pr);
133 #endif
134 #ifdef INET
135 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia);
136 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4);
137 #endif
138 #ifdef INET6
139 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6);
140 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6);
141 #endif
142
143 /* Flags for prison_deref */
144 #define PD_DEREF 0x01
145 #define PD_DEUREF 0x02
146 #define PD_LOCKED 0x04
147 #define PD_LIST_SLOCKED 0x08
148 #define PD_LIST_XLOCKED 0x10
149
150 /*
151 * Parameter names corresponding to PR_* flag values. Size values are for kvm
152 * as we cannot figure out the size of a sparse array, or an array without a
153 * terminating entry.
154 */
155 static char *pr_flag_names[] = {
156 [0] = "persist",
157 #ifdef INET
158 [7] = "ip4.saddrsel",
159 #endif
160 #ifdef INET6
161 [8] = "ip6.saddrsel",
162 #endif
163 };
164 const size_t pr_flag_names_size = sizeof(pr_flag_names);
165
166 static char *pr_flag_nonames[] = {
167 [0] = "nopersist",
168 #ifdef INET
169 [7] = "ip4.nosaddrsel",
170 #endif
171 #ifdef INET6
172 [8] = "ip6.nosaddrsel",
173 #endif
174 };
175 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames);
176
177 struct jailsys_flags {
178 const char *name;
179 unsigned disable;
180 unsigned new;
181 } pr_flag_jailsys[] = {
182 { "host", 0, PR_HOST },
183 #ifdef VIMAGE
184 { "vnet", 0, PR_VNET },
185 #endif
186 #ifdef INET
187 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER },
188 #endif
189 #ifdef INET6
190 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER },
191 #endif
192 };
193 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
194
195 static char *pr_allow_names[] = {
196 "allow.set_hostname",
197 "allow.sysvipc",
198 "allow.raw_sockets",
199 "allow.chflags",
200 "allow.mount",
201 "allow.quotas",
202 "allow.socket_af",
203 };
204 const size_t pr_allow_names_size = sizeof(pr_allow_names);
205
206 static char *pr_allow_nonames[] = {
207 "allow.noset_hostname",
208 "allow.nosysvipc",
209 "allow.noraw_sockets",
210 "allow.nochflags",
211 "allow.nomount",
212 "allow.noquotas",
213 "allow.nosocket_af",
214 };
215 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames);
216
217 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME
218 #define JAIL_DEFAULT_ENFORCE_STATFS 2
219 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
220 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
221 #if defined(INET) || defined(INET6)
222 static unsigned jail_max_af_ips = 255;
223 #endif
224
225 #ifdef INET
226 static int
227 qcmp_v4(const void *ip1, const void *ip2)
228 {
229 in_addr_t iaa, iab;
230
231 /*
232 * We need to compare in HBO here to get the list sorted as expected
233 * by the result of the code. Sorting NBO addresses gives you
234 * interesting results. If you do not understand, do not try.
235 */
236 iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
237 iab = ntohl(((const struct in_addr *)ip2)->s_addr);
238
239 /*
240 * Do not simply return the difference of the two numbers, the int is
241 * not wide enough.
242 */
243 if (iaa > iab)
244 return (1);
245 else if (iaa < iab)
246 return (-1);
247 else
248 return (0);
249 }
250 #endif
251
252 #ifdef INET6
253 static int
254 qcmp_v6(const void *ip1, const void *ip2)
255 {
256 const struct in6_addr *ia6a, *ia6b;
257 int i, rc;
258
259 ia6a = (const struct in6_addr *)ip1;
260 ia6b = (const struct in6_addr *)ip2;
261
262 rc = 0;
263 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
264 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
265 rc = 1;
266 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
267 rc = -1;
268 }
269 return (rc);
270 }
271 #endif
272
273 /*
274 * struct jail_args {
275 * struct jail *jail;
276 * };
277 */
278 int
279 sys_jail(struct thread *td, struct jail_args *uap)
280 {
281 uint32_t version;
282 int error;
283 struct jail j;
284
285 error = copyin(uap->jail, &version, sizeof(uint32_t));
286 if (error)
287 return (error);
288
289 switch (version) {
290 case 0:
291 {
292 struct jail_v0 j0;
293
294 /* FreeBSD single IPv4 jails. */
295 bzero(&j, sizeof(struct jail));
296 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
297 if (error)
298 return (error);
299 j.version = j0.version;
300 j.path = j0.path;
301 j.hostname = j0.hostname;
302 j.ip4s = j0.ip_number;
303 break;
304 }
305
306 case 1:
307 /*
308 * Version 1 was used by multi-IPv4 jail implementations
309 * that never made it into the official kernel.
310 */
311 return (EINVAL);
312
313 case 2: /* JAIL_API_VERSION */
314 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
315 error = copyin(uap->jail, &j, sizeof(struct jail));
316 if (error)
317 return (error);
318 break;
319
320 default:
321 /* Sci-Fi jails are not supported, sorry. */
322 return (EINVAL);
323 }
324 return (kern_jail(td, &j));
325 }
326
327 int
328 kern_jail(struct thread *td, struct jail *j)
329 {
330 struct iovec optiov[2 * (4
331 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0])
332 #ifdef INET
333 + 1
334 #endif
335 #ifdef INET6
336 + 1
337 #endif
338 )];
339 struct uio opt;
340 char *u_path, *u_hostname, *u_name;
341 #ifdef INET
342 uint32_t ip4s;
343 struct in_addr *u_ip4;
344 #endif
345 #ifdef INET6
346 struct in6_addr *u_ip6;
347 #endif
348 size_t tmplen;
349 int error, enforce_statfs, fi;
350
351 bzero(&optiov, sizeof(optiov));
352 opt.uio_iov = optiov;
353 opt.uio_iovcnt = 0;
354 opt.uio_offset = -1;
355 opt.uio_resid = -1;
356 opt.uio_segflg = UIO_SYSSPACE;
357 opt.uio_rw = UIO_READ;
358 opt.uio_td = td;
359
360 /* Set permissions for top-level jails from sysctls. */
361 if (!jailed(td->td_ucred)) {
362 for (fi = 0; fi < sizeof(pr_allow_names) /
363 sizeof(pr_allow_names[0]); fi++) {
364 optiov[opt.uio_iovcnt].iov_base =
365 (jail_default_allow & (1 << fi))
366 ? pr_allow_names[fi] : pr_allow_nonames[fi];
367 optiov[opt.uio_iovcnt].iov_len =
368 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
369 opt.uio_iovcnt += 2;
370 }
371 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
372 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
373 opt.uio_iovcnt++;
374 enforce_statfs = jail_default_enforce_statfs;
375 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
376 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
377 opt.uio_iovcnt++;
378 }
379
380 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
381 #ifdef INET
382 ip4s = (j->version == 0) ? 1 : j->ip4s;
383 if (ip4s > jail_max_af_ips)
384 return (EINVAL);
385 tmplen += ip4s * sizeof(struct in_addr);
386 #else
387 if (j->ip4s > 0)
388 return (EINVAL);
389 #endif
390 #ifdef INET6
391 if (j->ip6s > jail_max_af_ips)
392 return (EINVAL);
393 tmplen += j->ip6s * sizeof(struct in6_addr);
394 #else
395 if (j->ip6s > 0)
396 return (EINVAL);
397 #endif
398 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
399 u_hostname = u_path + MAXPATHLEN;
400 u_name = u_hostname + MAXHOSTNAMELEN;
401 #ifdef INET
402 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
403 #endif
404 #ifdef INET6
405 #ifdef INET
406 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
407 #else
408 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
409 #endif
410 #endif
411 optiov[opt.uio_iovcnt].iov_base = "path";
412 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
413 opt.uio_iovcnt++;
414 optiov[opt.uio_iovcnt].iov_base = u_path;
415 error = copyinstr(j->path, u_path, MAXPATHLEN,
416 &optiov[opt.uio_iovcnt].iov_len);
417 if (error) {
418 free(u_path, M_TEMP);
419 return (error);
420 }
421 opt.uio_iovcnt++;
422 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
423 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
424 opt.uio_iovcnt++;
425 optiov[opt.uio_iovcnt].iov_base = u_hostname;
426 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
427 &optiov[opt.uio_iovcnt].iov_len);
428 if (error) {
429 free(u_path, M_TEMP);
430 return (error);
431 }
432 opt.uio_iovcnt++;
433 if (j->jailname != NULL) {
434 optiov[opt.uio_iovcnt].iov_base = "name";
435 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
436 opt.uio_iovcnt++;
437 optiov[opt.uio_iovcnt].iov_base = u_name;
438 error = copyinstr(j->jailname, u_name, 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 }
446 #ifdef INET
447 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
448 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
449 opt.uio_iovcnt++;
450 optiov[opt.uio_iovcnt].iov_base = u_ip4;
451 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
452 if (j->version == 0)
453 u_ip4->s_addr = j->ip4s;
454 else {
455 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
456 if (error) {
457 free(u_path, M_TEMP);
458 return (error);
459 }
460 }
461 opt.uio_iovcnt++;
462 #endif
463 #ifdef INET6
464 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
465 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
466 opt.uio_iovcnt++;
467 optiov[opt.uio_iovcnt].iov_base = u_ip6;
468 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
469 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
470 if (error) {
471 free(u_path, M_TEMP);
472 return (error);
473 }
474 opt.uio_iovcnt++;
475 #endif
476 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]),
477 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
478 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
479 free(u_path, M_TEMP);
480 return (error);
481 }
482
483
484 /*
485 * struct jail_set_args {
486 * struct iovec *iovp;
487 * unsigned int iovcnt;
488 * int flags;
489 * };
490 */
491 int
492 sys_jail_set(struct thread *td, struct jail_set_args *uap)
493 {
494 struct uio *auio;
495 int error;
496
497 /* Check that we have an even number of iovecs. */
498 if (uap->iovcnt & 1)
499 return (EINVAL);
500
501 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
502 if (error)
503 return (error);
504 error = kern_jail_set(td, auio, uap->flags);
505 free(auio, M_IOV);
506 return (error);
507 }
508
509 int
510 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
511 {
512 struct nameidata nd;
513 #ifdef INET
514 struct in_addr *ip4;
515 #endif
516 #ifdef INET6
517 struct in6_addr *ip6;
518 #endif
519 struct vfsopt *opt;
520 struct vfsoptlist *opts;
521 struct prison *pr, *deadpr, *mypr, *ppr, *tpr;
522 struct vnode *root;
523 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
524 #if defined(INET) || defined(INET6)
525 struct prison *tppr;
526 void *op;
527 #endif
528 unsigned long hid;
529 size_t namelen, onamelen;
530 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos;
531 int gotchildmax, gotenforce, gothid, gotslevel;
532 int fi, jid, jsys, len, level;
533 int childmax, slevel, vfslocked;
534 #if defined(INET) || defined(INET6)
535 int ii, ij;
536 #endif
537 #ifdef INET
538 int ip4s, redo_ip4;
539 #endif
540 #ifdef INET6
541 int ip6s, redo_ip6;
542 #endif
543 uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
544 unsigned tallow;
545 char numbuf[12];
546
547 error = priv_check(td, PRIV_JAIL_SET);
548 if (!error && (flags & JAIL_ATTACH))
549 error = priv_check(td, PRIV_JAIL_ATTACH);
550 if (error)
551 return (error);
552 mypr = ppr = td->td_ucred->cr_prison;
553 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
554 return (EPERM);
555 if (flags & ~JAIL_SET_MASK)
556 return (EINVAL);
557
558 /*
559 * Check all the parameters before committing to anything. Not all
560 * errors can be caught early, but we may as well try. Also, this
561 * takes care of some expensive stuff (path lookup) before getting
562 * the allprison lock.
563 *
564 * XXX Jails are not filesystems, and jail parameters are not mount
565 * options. But it makes more sense to re-use the vfsopt code
566 * than duplicate it under a different name.
567 */
568 error = vfs_buildopts(optuio, &opts);
569 if (error)
570 return (error);
571 #ifdef INET
572 ip4 = NULL;
573 #endif
574 #ifdef INET6
575 ip6 = NULL;
576 #endif
577
578 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
579 if (error == ENOENT)
580 jid = 0;
581 else if (error != 0)
582 goto done_free;
583
584 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
585 if (error == ENOENT)
586 gotslevel = 0;
587 else if (error != 0)
588 goto done_free;
589 else
590 gotslevel = 1;
591
592 error =
593 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
594 if (error == ENOENT)
595 gotchildmax = 0;
596 else if (error != 0)
597 goto done_free;
598 else
599 gotchildmax = 1;
600
601 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
602 if (error == ENOENT)
603 gotenforce = 0;
604 else if (error != 0)
605 goto done_free;
606 else if (enforce < 0 || enforce > 2) {
607 error = EINVAL;
608 goto done_free;
609 } else
610 gotenforce = 1;
611
612 pr_flags = ch_flags = 0;
613 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
614 fi++) {
615 if (pr_flag_names[fi] == NULL)
616 continue;
617 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi);
618 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi);
619 }
620 ch_flags |= pr_flags;
621 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
622 fi++) {
623 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys,
624 sizeof(jsys));
625 if (error == ENOENT)
626 continue;
627 if (error != 0)
628 goto done_free;
629 switch (jsys) {
630 case JAIL_SYS_DISABLE:
631 if (!pr_flag_jailsys[fi].disable) {
632 error = EINVAL;
633 goto done_free;
634 }
635 pr_flags |= pr_flag_jailsys[fi].disable;
636 break;
637 case JAIL_SYS_NEW:
638 pr_flags |= pr_flag_jailsys[fi].new;
639 break;
640 case JAIL_SYS_INHERIT:
641 break;
642 default:
643 error = EINVAL;
644 goto done_free;
645 }
646 ch_flags |=
647 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable;
648 }
649 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE
650 && !(pr_flags & PR_PERSIST)) {
651 error = EINVAL;
652 vfs_opterror(opts, "new jail must persist or attach");
653 goto done_errmsg;
654 }
655 #ifdef VIMAGE
656 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
657 error = EINVAL;
658 vfs_opterror(opts, "vnet cannot be changed after creation");
659 goto done_errmsg;
660 }
661 #endif
662 #ifdef INET
663 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
664 error = EINVAL;
665 vfs_opterror(opts, "ip4 cannot be changed after creation");
666 goto done_errmsg;
667 }
668 #endif
669 #ifdef INET6
670 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
671 error = EINVAL;
672 vfs_opterror(opts, "ip6 cannot be changed after creation");
673 goto done_errmsg;
674 }
675 #endif
676
677 pr_allow = ch_allow = 0;
678 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
679 fi++) {
680 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi);
681 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi);
682 }
683 ch_allow |= pr_allow;
684
685 error = vfs_getopt(opts, "name", (void **)&name, &len);
686 if (error == ENOENT)
687 name = NULL;
688 else if (error != 0)
689 goto done_free;
690 else {
691 if (len == 0 || name[len - 1] != '\0') {
692 error = EINVAL;
693 goto done_free;
694 }
695 if (len > MAXHOSTNAMELEN) {
696 error = ENAMETOOLONG;
697 goto done_free;
698 }
699 }
700
701 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
702 if (error == ENOENT)
703 host = NULL;
704 else if (error != 0)
705 goto done_free;
706 else {
707 ch_flags |= PR_HOST;
708 pr_flags |= PR_HOST;
709 if (len == 0 || host[len - 1] != '\0') {
710 error = EINVAL;
711 goto done_free;
712 }
713 if (len > MAXHOSTNAMELEN) {
714 error = ENAMETOOLONG;
715 goto done_free;
716 }
717 }
718
719 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
720 if (error == ENOENT)
721 domain = NULL;
722 else if (error != 0)
723 goto done_free;
724 else {
725 ch_flags |= PR_HOST;
726 pr_flags |= PR_HOST;
727 if (len == 0 || domain[len - 1] != '\0') {
728 error = EINVAL;
729 goto done_free;
730 }
731 if (len > MAXHOSTNAMELEN) {
732 error = ENAMETOOLONG;
733 goto done_free;
734 }
735 }
736
737 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
738 if (error == ENOENT)
739 uuid = NULL;
740 else if (error != 0)
741 goto done_free;
742 else {
743 ch_flags |= PR_HOST;
744 pr_flags |= PR_HOST;
745 if (len == 0 || uuid[len - 1] != '\0') {
746 error = EINVAL;
747 goto done_free;
748 }
749 if (len > HOSTUUIDLEN) {
750 error = ENAMETOOLONG;
751 goto done_free;
752 }
753 }
754
755 #ifdef COMPAT_FREEBSD32
756 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
757 uint32_t hid32;
758
759 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
760 hid = hid32;
761 } else
762 #endif
763 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
764 if (error == ENOENT)
765 gothid = 0;
766 else if (error != 0)
767 goto done_free;
768 else {
769 gothid = 1;
770 ch_flags |= PR_HOST;
771 pr_flags |= PR_HOST;
772 }
773
774 #ifdef INET
775 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
776 if (error == ENOENT)
777 ip4s = (pr_flags & PR_IP4_DISABLE) ? 0 : -1;
778 else if (error != 0)
779 goto done_free;
780 else if (ip4s & (sizeof(*ip4) - 1)) {
781 error = EINVAL;
782 goto done_free;
783 } else {
784 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE;
785 if (ip4s == 0)
786 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE;
787 else {
788 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER;
789 ip4s /= sizeof(*ip4);
790 if (ip4s > jail_max_af_ips) {
791 error = EINVAL;
792 vfs_opterror(opts, "too many IPv4 addresses");
793 goto done_errmsg;
794 }
795 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
796 bcopy(op, ip4, ip4s * sizeof(*ip4));
797 /*
798 * IP addresses are all sorted but ip[0] to preserve
799 * the primary IP address as given from userland.
800 * This special IP is used for unbound outgoing
801 * connections as well for "loopback" traffic in case
802 * source address selection cannot find any more fitting
803 * address to connect from.
804 */
805 if (ip4s > 1)
806 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4);
807 /*
808 * Check for duplicate addresses and do some simple
809 * zero and broadcast checks. If users give other bogus
810 * addresses it is their problem.
811 *
812 * We do not have to care about byte order for these
813 * checks so we will do them in NBO.
814 */
815 for (ii = 0; ii < ip4s; ii++) {
816 if (ip4[ii].s_addr == INADDR_ANY ||
817 ip4[ii].s_addr == INADDR_BROADCAST) {
818 error = EINVAL;
819 goto done_free;
820 }
821 if ((ii+1) < ip4s &&
822 (ip4[0].s_addr == ip4[ii+1].s_addr ||
823 ip4[ii].s_addr == ip4[ii+1].s_addr)) {
824 error = EINVAL;
825 goto done_free;
826 }
827 }
828 }
829 }
830 #endif
831
832 #ifdef INET6
833 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
834 if (error == ENOENT)
835 ip6s = (pr_flags & PR_IP6_DISABLE) ? 0 : -1;
836 else if (error != 0)
837 goto done_free;
838 else if (ip6s & (sizeof(*ip6) - 1)) {
839 error = EINVAL;
840 goto done_free;
841 } else {
842 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE;
843 if (ip6s == 0)
844 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE;
845 else {
846 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER;
847 ip6s /= sizeof(*ip6);
848 if (ip6s > jail_max_af_ips) {
849 error = EINVAL;
850 vfs_opterror(opts, "too many IPv6 addresses");
851 goto done_errmsg;
852 }
853 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
854 bcopy(op, ip6, ip6s * sizeof(*ip6));
855 if (ip6s > 1)
856 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6);
857 for (ii = 0; ii < ip6s; ii++) {
858 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
859 error = EINVAL;
860 goto done_free;
861 }
862 if ((ii+1) < ip6s &&
863 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
864 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
865 {
866 error = EINVAL;
867 goto done_free;
868 }
869 }
870 }
871 }
872 #endif
873
874 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
875 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
876 error = EINVAL;
877 vfs_opterror(opts,
878 "vnet jails cannot have IP address restrictions");
879 goto done_errmsg;
880 }
881 #endif
882
883 root = NULL;
884 error = vfs_getopt(opts, "path", (void **)&path, &len);
885 if (error == ENOENT)
886 path = NULL;
887 else if (error != 0)
888 goto done_free;
889 else {
890 if (flags & JAIL_UPDATE) {
891 error = EINVAL;
892 vfs_opterror(opts,
893 "path cannot be changed after creation");
894 goto done_errmsg;
895 }
896 if (len == 0 || path[len - 1] != '\0') {
897 error = EINVAL;
898 goto done_free;
899 }
900 if (len < 2 || (len == 2 && path[0] == '/'))
901 path = NULL;
902 else {
903 /* Leave room for a real-root full pathname. */
904 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/")
905 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) {
906 error = ENAMETOOLONG;
907 goto done_free;
908 }
909 NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW, UIO_SYSSPACE,
910 path, td);
911 error = namei(&nd);
912 if (error)
913 goto done_free;
914 vfslocked = NDHASGIANT(&nd);
915 root = nd.ni_vp;
916 NDFREE(&nd, NDF_ONLY_PNBUF);
917 if (root->v_type != VDIR) {
918 error = ENOTDIR;
919 vrele(root);
920 VFS_UNLOCK_GIANT(vfslocked);
921 goto done_free;
922 }
923 VFS_UNLOCK_GIANT(vfslocked);
924 }
925 }
926
927 /*
928 * Grab the allprison lock before letting modules check their
929 * parameters. Once we have it, do not let go so we'll have a
930 * consistent view of the OSD list.
931 */
932 sx_xlock(&allprison_lock);
933 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts);
934 if (error)
935 goto done_unlock_list;
936
937 /* By now, all parameters should have been noted. */
938 TAILQ_FOREACH(opt, opts, link) {
939 if (!opt->seen && strcmp(opt->name, "errmsg")) {
940 error = EINVAL;
941 vfs_opterror(opts, "unknown parameter: %s", opt->name);
942 goto done_unlock_list;
943 }
944 }
945
946 /*
947 * See if we are creating a new record or updating an existing one.
948 * This abuses the file error codes ENOENT and EEXIST.
949 */
950 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
951 if (!cuflags) {
952 error = EINVAL;
953 vfs_opterror(opts, "no valid operation (create or update)");
954 goto done_unlock_list;
955 }
956 pr = NULL;
957 namelc = NULL;
958 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
959 namelc = strrchr(name, '.');
960 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
961 if (*p != '\0')
962 jid = 0;
963 }
964 if (jid != 0) {
965 /*
966 * See if a requested jid already exists. There is an
967 * information leak here if the jid exists but is not within
968 * the caller's jail hierarchy. Jail creators will get EEXIST
969 * even though they cannot see the jail, and CREATE | UPDATE
970 * will return ENOENT which is not normally a valid error.
971 */
972 if (jid < 0) {
973 error = EINVAL;
974 vfs_opterror(opts, "negative jid");
975 goto done_unlock_list;
976 }
977 pr = prison_find(jid);
978 if (pr != NULL) {
979 ppr = pr->pr_parent;
980 /* Create: jid must not exist. */
981 if (cuflags == JAIL_CREATE) {
982 mtx_unlock(&pr->pr_mtx);
983 error = EEXIST;
984 vfs_opterror(opts, "jail %d already exists",
985 jid);
986 goto done_unlock_list;
987 }
988 if (!prison_ischild(mypr, pr)) {
989 mtx_unlock(&pr->pr_mtx);
990 pr = NULL;
991 } else if (pr->pr_uref == 0) {
992 if (!(flags & JAIL_DYING)) {
993 mtx_unlock(&pr->pr_mtx);
994 error = ENOENT;
995 vfs_opterror(opts, "jail %d is dying",
996 jid);
997 goto done_unlock_list;
998 } else if ((flags & JAIL_ATTACH) ||
999 (pr_flags & PR_PERSIST)) {
1000 /*
1001 * A dying jail might be resurrected
1002 * (via attach or persist), but first
1003 * it must determine if another jail
1004 * has claimed its name. Accomplish
1005 * this by implicitly re-setting the
1006 * name.
1007 */
1008 if (name == NULL)
1009 name = prison_name(mypr, pr);
1010 }
1011 }
1012 }
1013 if (pr == NULL) {
1014 /* Update: jid must exist. */
1015 if (cuflags == JAIL_UPDATE) {
1016 error = ENOENT;
1017 vfs_opterror(opts, "jail %d not found", jid);
1018 goto done_unlock_list;
1019 }
1020 }
1021 }
1022 /*
1023 * If the caller provided a name, look for a jail by that name.
1024 * This has different semantics for creates and updates keyed by jid
1025 * (where the name must not already exist in a different jail),
1026 * and updates keyed by the name itself (where the name must exist
1027 * because that is the jail being updated).
1028 */
1029 if (name != NULL) {
1030 namelc = strrchr(name, '.');
1031 if (namelc == NULL)
1032 namelc = name;
1033 else {
1034 /*
1035 * This is a hierarchical name. Split it into the
1036 * parent and child names, and make sure the parent
1037 * exists or matches an already found jail.
1038 */
1039 *namelc = '\0';
1040 if (pr != NULL) {
1041 if (strncmp(name, ppr->pr_name, namelc - name)
1042 || ppr->pr_name[namelc - name] != '\0') {
1043 mtx_unlock(&pr->pr_mtx);
1044 error = EINVAL;
1045 vfs_opterror(opts,
1046 "cannot change jail's parent");
1047 goto done_unlock_list;
1048 }
1049 } else {
1050 ppr = prison_find_name(mypr, name);
1051 if (ppr == NULL) {
1052 error = ENOENT;
1053 vfs_opterror(opts,
1054 "jail \"%s\" not found", name);
1055 goto done_unlock_list;
1056 }
1057 mtx_unlock(&ppr->pr_mtx);
1058 }
1059 name = ++namelc;
1060 }
1061 if (name[0] != '\0') {
1062 namelen =
1063 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1064 name_again:
1065 deadpr = NULL;
1066 FOREACH_PRISON_CHILD(ppr, tpr) {
1067 if (tpr != pr && tpr->pr_ref > 0 &&
1068 !strcmp(tpr->pr_name + namelen, name)) {
1069 if (pr == NULL &&
1070 cuflags != JAIL_CREATE) {
1071 mtx_lock(&tpr->pr_mtx);
1072 if (tpr->pr_ref > 0) {
1073 /*
1074 * Use this jail
1075 * for updates.
1076 */
1077 if (tpr->pr_uref > 0) {
1078 pr = tpr;
1079 break;
1080 }
1081 deadpr = tpr;
1082 }
1083 mtx_unlock(&tpr->pr_mtx);
1084 } else if (tpr->pr_uref > 0) {
1085 /*
1086 * Create, or update(jid):
1087 * name must not exist in an
1088 * active sibling jail.
1089 */
1090 error = EEXIST;
1091 if (pr != NULL)
1092 mtx_unlock(&pr->pr_mtx);
1093 vfs_opterror(opts,
1094 "jail \"%s\" already exists",
1095 name);
1096 goto done_unlock_list;
1097 }
1098 }
1099 }
1100 /* If no active jail is found, use a dying one. */
1101 if (deadpr != NULL && pr == NULL) {
1102 if (flags & JAIL_DYING) {
1103 mtx_lock(&deadpr->pr_mtx);
1104 if (deadpr->pr_ref == 0) {
1105 mtx_unlock(&deadpr->pr_mtx);
1106 goto name_again;
1107 }
1108 pr = deadpr;
1109 } else if (cuflags == JAIL_UPDATE) {
1110 error = ENOENT;
1111 vfs_opterror(opts,
1112 "jail \"%s\" is dying", name);
1113 goto done_unlock_list;
1114 }
1115 }
1116 /* Update: name must exist if no jid. */
1117 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1118 error = ENOENT;
1119 vfs_opterror(opts, "jail \"%s\" not found",
1120 name);
1121 goto done_unlock_list;
1122 }
1123 }
1124 }
1125 /* Update: must provide a jid or name. */
1126 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1127 error = ENOENT;
1128 vfs_opterror(opts, "update specified no jail");
1129 goto done_unlock_list;
1130 }
1131
1132 /* If there's no prison to update, create a new one and link it in. */
1133 if (pr == NULL) {
1134 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1135 if (tpr->pr_childcount >= tpr->pr_childmax) {
1136 error = EPERM;
1137 vfs_opterror(opts, "prison limit exceeded");
1138 goto done_unlock_list;
1139 }
1140 created = 1;
1141 mtx_lock(&ppr->pr_mtx);
1142 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) {
1143 mtx_unlock(&ppr->pr_mtx);
1144 error = ENOENT;
1145 vfs_opterror(opts, "parent jail went away!");
1146 goto done_unlock_list;
1147 }
1148 ppr->pr_ref++;
1149 ppr->pr_uref++;
1150 mtx_unlock(&ppr->pr_mtx);
1151 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1152 if (jid == 0) {
1153 /* Find the next free jid. */
1154 jid = lastprid + 1;
1155 findnext:
1156 if (jid == JAIL_MAX)
1157 jid = 1;
1158 TAILQ_FOREACH(tpr, &allprison, pr_list) {
1159 if (tpr->pr_id < jid)
1160 continue;
1161 if (tpr->pr_id > jid || tpr->pr_ref == 0) {
1162 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1163 break;
1164 }
1165 if (jid == lastprid) {
1166 error = EAGAIN;
1167 vfs_opterror(opts,
1168 "no available jail IDs");
1169 free(pr, M_PRISON);
1170 prison_deref(ppr, PD_DEREF |
1171 PD_DEUREF | PD_LIST_XLOCKED);
1172 goto done_releroot;
1173 }
1174 jid++;
1175 goto findnext;
1176 }
1177 lastprid = jid;
1178 } else {
1179 /*
1180 * The jail already has a jid (that did not yet exist),
1181 * so just find where to insert it.
1182 */
1183 TAILQ_FOREACH(tpr, &allprison, pr_list)
1184 if (tpr->pr_id >= jid) {
1185 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1186 break;
1187 }
1188 }
1189 if (tpr == NULL)
1190 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1191 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1192 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1193 tpr->pr_childcount++;
1194
1195 pr->pr_parent = ppr;
1196 pr->pr_id = jid;
1197
1198 /* Set some default values, and inherit some from the parent. */
1199 if (name == NULL)
1200 name = "";
1201 if (path == NULL) {
1202 path = "/";
1203 root = mypr->pr_root;
1204 vref(root);
1205 }
1206 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1207 pr->pr_flags |= PR_HOST;
1208 #if defined(INET) || defined(INET6)
1209 #ifdef VIMAGE
1210 if (!(pr_flags & PR_VNET))
1211 #endif
1212 {
1213 #ifdef INET
1214 if (!(ch_flags & PR_IP4_USER))
1215 pr->pr_flags |=
1216 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE;
1217 else if (!(pr_flags & PR_IP4_USER)) {
1218 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1219 if (ppr->pr_ip4 != NULL) {
1220 pr->pr_ip4s = ppr->pr_ip4s;
1221 pr->pr_ip4 = malloc(pr->pr_ip4s *
1222 sizeof(struct in_addr), M_PRISON,
1223 M_WAITOK);
1224 bcopy(ppr->pr_ip4, pr->pr_ip4,
1225 pr->pr_ip4s * sizeof(*pr->pr_ip4));
1226 }
1227 }
1228 #endif
1229 #ifdef INET6
1230 if (!(ch_flags & PR_IP6_USER))
1231 pr->pr_flags |=
1232 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE;
1233 else if (!(pr_flags & PR_IP6_USER)) {
1234 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1235 if (ppr->pr_ip6 != NULL) {
1236 pr->pr_ip6s = ppr->pr_ip6s;
1237 pr->pr_ip6 = malloc(pr->pr_ip6s *
1238 sizeof(struct in6_addr), M_PRISON,
1239 M_WAITOK);
1240 bcopy(ppr->pr_ip6, pr->pr_ip6,
1241 pr->pr_ip6s * sizeof(*pr->pr_ip6));
1242 }
1243 }
1244 #endif
1245 }
1246 #endif
1247 /* Source address selection is always on by default. */
1248 pr->pr_flags |= _PR_IP_SADDRSEL;
1249
1250 pr->pr_securelevel = ppr->pr_securelevel;
1251 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1252 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
1253
1254 LIST_INIT(&pr->pr_children);
1255 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1256
1257 #ifdef VIMAGE
1258 /* Allocate a new vnet if specified. */
1259 pr->pr_vnet = (pr_flags & PR_VNET)
1260 ? vnet_alloc() : ppr->pr_vnet;
1261 #endif
1262 /*
1263 * Allocate a dedicated cpuset for each jail.
1264 * Unlike other initial settings, this may return an erorr.
1265 */
1266 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1267 if (error) {
1268 prison_deref(pr, PD_LIST_XLOCKED);
1269 goto done_releroot;
1270 }
1271
1272 mtx_lock(&pr->pr_mtx);
1273 /*
1274 * New prisons do not yet have a reference, because we do not
1275 * want other to see the incomplete prison once the
1276 * allprison_lock is downgraded.
1277 */
1278 } else {
1279 created = 0;
1280 /*
1281 * Grab a reference for existing prisons, to ensure they
1282 * continue to exist for the duration of the call.
1283 */
1284 pr->pr_ref++;
1285 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1286 if ((pr->pr_flags & PR_VNET) &&
1287 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1288 error = EINVAL;
1289 vfs_opterror(opts,
1290 "vnet jails cannot have IP address restrictions");
1291 goto done_deref_locked;
1292 }
1293 #endif
1294 #ifdef INET
1295 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1296 error = EINVAL;
1297 vfs_opterror(opts,
1298 "ip4 cannot be changed after creation");
1299 goto done_deref_locked;
1300 }
1301 #endif
1302 #ifdef INET6
1303 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1304 error = EINVAL;
1305 vfs_opterror(opts,
1306 "ip6 cannot be changed after creation");
1307 goto done_deref_locked;
1308 }
1309 #endif
1310 }
1311
1312 /* Do final error checking before setting anything. */
1313 if (gotslevel) {
1314 if (slevel < ppr->pr_securelevel) {
1315 error = EPERM;
1316 goto done_deref_locked;
1317 }
1318 }
1319 if (gotchildmax) {
1320 if (childmax >= ppr->pr_childmax) {
1321 error = EPERM;
1322 goto done_deref_locked;
1323 }
1324 }
1325 if (gotenforce) {
1326 if (enforce < ppr->pr_enforce_statfs) {
1327 error = EPERM;
1328 goto done_deref_locked;
1329 }
1330 }
1331 #ifdef INET
1332 if (ip4s > 0) {
1333 if (ppr->pr_flags & PR_IP4) {
1334 /*
1335 * Make sure the new set of IP addresses is a
1336 * subset of the parent's list. Don't worry
1337 * about the parent being unlocked, as any
1338 * setting is done with allprison_lock held.
1339 */
1340 for (ij = 0; ij < ppr->pr_ip4s; ij++)
1341 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
1342 break;
1343 if (ij == ppr->pr_ip4s) {
1344 error = EPERM;
1345 goto done_deref_locked;
1346 }
1347 if (ip4s > 1) {
1348 for (ii = ij = 1; ii < ip4s; ii++) {
1349 if (ip4[ii].s_addr ==
1350 ppr->pr_ip4[0].s_addr)
1351 continue;
1352 for (; ij < ppr->pr_ip4s; ij++)
1353 if (ip4[ii].s_addr ==
1354 ppr->pr_ip4[ij].s_addr)
1355 break;
1356 if (ij == ppr->pr_ip4s)
1357 break;
1358 }
1359 if (ij == ppr->pr_ip4s) {
1360 error = EPERM;
1361 goto done_deref_locked;
1362 }
1363 }
1364 }
1365 /*
1366 * Check for conflicting IP addresses. We permit them
1367 * if there is no more than one IP on each jail. If
1368 * there is a duplicate on a jail with more than one
1369 * IP stop checking and return error.
1370 */
1371 tppr = ppr;
1372 #ifdef VIMAGE
1373 for (; tppr != &prison0; tppr = tppr->pr_parent)
1374 if (tppr->pr_flags & PR_VNET)
1375 break;
1376 #endif
1377 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1378 if (tpr == pr ||
1379 #ifdef VIMAGE
1380 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1381 #endif
1382 tpr->pr_uref == 0) {
1383 descend = 0;
1384 continue;
1385 }
1386 if (!(tpr->pr_flags & PR_IP4_USER))
1387 continue;
1388 descend = 0;
1389 if (tpr->pr_ip4 == NULL ||
1390 (ip4s == 1 && tpr->pr_ip4s == 1))
1391 continue;
1392 for (ii = 0; ii < ip4s; ii++) {
1393 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) {
1394 error = EADDRINUSE;
1395 vfs_opterror(opts,
1396 "IPv4 addresses clash");
1397 goto done_deref_locked;
1398 }
1399 }
1400 }
1401 }
1402 #endif
1403 #ifdef INET6
1404 if (ip6s > 0) {
1405 if (ppr->pr_flags & PR_IP6) {
1406 /*
1407 * Make sure the new set of IP addresses is a
1408 * subset of the parent's list.
1409 */
1410 for (ij = 0; ij < ppr->pr_ip6s; ij++)
1411 if (IN6_ARE_ADDR_EQUAL(&ip6[0],
1412 &ppr->pr_ip6[ij]))
1413 break;
1414 if (ij == ppr->pr_ip6s) {
1415 error = EPERM;
1416 goto done_deref_locked;
1417 }
1418 if (ip6s > 1) {
1419 for (ii = ij = 1; ii < ip6s; ii++) {
1420 if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
1421 &ppr->pr_ip6[0]))
1422 continue;
1423 for (; ij < ppr->pr_ip6s; ij++)
1424 if (IN6_ARE_ADDR_EQUAL(
1425 &ip6[ii], &ppr->pr_ip6[ij]))
1426 break;
1427 if (ij == ppr->pr_ip6s)
1428 break;
1429 }
1430 if (ij == ppr->pr_ip6s) {
1431 error = EPERM;
1432 goto done_deref_locked;
1433 }
1434 }
1435 }
1436 /* Check for conflicting IP addresses. */
1437 tppr = ppr;
1438 #ifdef VIMAGE
1439 for (; tppr != &prison0; tppr = tppr->pr_parent)
1440 if (tppr->pr_flags & PR_VNET)
1441 break;
1442 #endif
1443 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1444 if (tpr == pr ||
1445 #ifdef VIMAGE
1446 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1447 #endif
1448 tpr->pr_uref == 0) {
1449 descend = 0;
1450 continue;
1451 }
1452 if (!(tpr->pr_flags & PR_IP6_USER))
1453 continue;
1454 descend = 0;
1455 if (tpr->pr_ip6 == NULL ||
1456 (ip6s == 1 && tpr->pr_ip6s == 1))
1457 continue;
1458 for (ii = 0; ii < ip6s; ii++) {
1459 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) {
1460 error = EADDRINUSE;
1461 vfs_opterror(opts,
1462 "IPv6 addresses clash");
1463 goto done_deref_locked;
1464 }
1465 }
1466 }
1467 }
1468 #endif
1469 onamelen = namelen = 0;
1470 if (name != NULL) {
1471 /* Give a default name of the jid. */
1472 if (name[0] == '\0')
1473 snprintf(name = numbuf, sizeof(numbuf), "%d", jid);
1474 else if (*namelc == '' || (strtoul(namelc, &p, 10) != jid &&
1475 *p == '\0')) {
1476 error = EINVAL;
1477 vfs_opterror(opts,
1478 "name cannot be numeric (unless it is the jid)");
1479 goto done_deref_locked;
1480 }
1481 /*
1482 * Make sure the name isn't too long for the prison or its
1483 * children.
1484 */
1485 onamelen = strlen(pr->pr_name);
1486 namelen = strlen(name);
1487 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) {
1488 error = ENAMETOOLONG;
1489 goto done_deref_locked;
1490 }
1491 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1492 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
1493 sizeof(pr->pr_name)) {
1494 error = ENAMETOOLONG;
1495 goto done_deref_locked;
1496 }
1497 }
1498 }
1499 if (pr_allow & ~ppr->pr_allow) {
1500 error = EPERM;
1501 goto done_deref_locked;
1502 }
1503
1504 /* Set the parameters of the prison. */
1505 #ifdef INET
1506 redo_ip4 = 0;
1507 if (pr_flags & PR_IP4_USER) {
1508 pr->pr_flags |= PR_IP4;
1509 free(pr->pr_ip4, M_PRISON);
1510 pr->pr_ip4s = ip4s;
1511 pr->pr_ip4 = ip4;
1512 ip4 = NULL;
1513 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1514 #ifdef VIMAGE
1515 if (tpr->pr_flags & PR_VNET) {
1516 descend = 0;
1517 continue;
1518 }
1519 #endif
1520 if (prison_restrict_ip4(tpr, NULL)) {
1521 redo_ip4 = 1;
1522 descend = 0;
1523 }
1524 }
1525 }
1526 #endif
1527 #ifdef INET6
1528 redo_ip6 = 0;
1529 if (pr_flags & PR_IP6_USER) {
1530 pr->pr_flags |= PR_IP6;
1531 free(pr->pr_ip6, M_PRISON);
1532 pr->pr_ip6s = ip6s;
1533 pr->pr_ip6 = ip6;
1534 ip6 = NULL;
1535 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1536 #ifdef VIMAGE
1537 if (tpr->pr_flags & PR_VNET) {
1538 descend = 0;
1539 continue;
1540 }
1541 #endif
1542 if (prison_restrict_ip6(tpr, NULL)) {
1543 redo_ip6 = 1;
1544 descend = 0;
1545 }
1546 }
1547 }
1548 #endif
1549 if (gotslevel) {
1550 pr->pr_securelevel = slevel;
1551 /* Set all child jails to be at least this level. */
1552 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1553 if (tpr->pr_securelevel < slevel)
1554 tpr->pr_securelevel = slevel;
1555 }
1556 if (gotchildmax) {
1557 pr->pr_childmax = childmax;
1558 /* Set all child jails to under this limit. */
1559 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
1560 if (tpr->pr_childmax > childmax - level)
1561 tpr->pr_childmax = childmax > level
1562 ? childmax - level : 0;
1563 }
1564 if (gotenforce) {
1565 pr->pr_enforce_statfs = enforce;
1566 /* Pass this restriction on to the children. */
1567 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1568 if (tpr->pr_enforce_statfs < enforce)
1569 tpr->pr_enforce_statfs = enforce;
1570 }
1571 if (name != NULL) {
1572 if (ppr == &prison0)
1573 strlcpy(pr->pr_name, name, sizeof(pr->pr_name));
1574 else
1575 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
1576 ppr->pr_name, name);
1577 /* Change this component of child names. */
1578 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1579 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
1580 strlen(tpr->pr_name + onamelen) + 1);
1581 bcopy(pr->pr_name, tpr->pr_name, namelen);
1582 }
1583 }
1584 if (path != NULL) {
1585 /* Try to keep a real-rooted full pathname. */
1586 if (path[0] == '/' && strcmp(mypr->pr_path, "/"))
1587 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s",
1588 mypr->pr_path, path);
1589 else
1590 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
1591 pr->pr_root = root;
1592 }
1593 if (PR_HOST & ch_flags & ~pr_flags) {
1594 if (pr->pr_flags & PR_HOST) {
1595 /*
1596 * Copy the parent's host info. As with pr_ip4 above,
1597 * the lack of a lock on the parent is not a problem;
1598 * it is always set with allprison_lock at least
1599 * shared, and is held exclusively here.
1600 */
1601 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
1602 sizeof(pr->pr_hostname));
1603 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
1604 sizeof(pr->pr_domainname));
1605 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
1606 sizeof(pr->pr_hostuuid));
1607 pr->pr_hostid = pr->pr_parent->pr_hostid;
1608 }
1609 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
1610 /* Set this prison, and any descendants without PR_HOST. */
1611 if (host != NULL)
1612 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
1613 if (domain != NULL)
1614 strlcpy(pr->pr_domainname, domain,
1615 sizeof(pr->pr_domainname));
1616 if (uuid != NULL)
1617 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
1618 if (gothid)
1619 pr->pr_hostid = hid;
1620 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1621 if (tpr->pr_flags & PR_HOST)
1622 descend = 0;
1623 else {
1624 if (host != NULL)
1625 strlcpy(tpr->pr_hostname,
1626 pr->pr_hostname,
1627 sizeof(tpr->pr_hostname));
1628 if (domain != NULL)
1629 strlcpy(tpr->pr_domainname,
1630 pr->pr_domainname,
1631 sizeof(tpr->pr_domainname));
1632 if (uuid != NULL)
1633 strlcpy(tpr->pr_hostuuid,
1634 pr->pr_hostuuid,
1635 sizeof(tpr->pr_hostuuid));
1636 if (gothid)
1637 tpr->pr_hostid = hid;
1638 }
1639 }
1640 }
1641 if ((tallow = ch_allow & ~pr_allow)) {
1642 /* Clear allow bits in all children. */
1643 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1644 tpr->pr_allow &= ~tallow;
1645 }
1646 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
1647 /*
1648 * Persistent prisons get an extra reference, and prisons losing their
1649 * persist flag lose that reference. Only do this for existing prisons
1650 * for now, so new ones will remain unseen until after the module
1651 * handlers have completed.
1652 */
1653 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) {
1654 if (pr_flags & PR_PERSIST) {
1655 pr->pr_ref++;
1656 pr->pr_uref++;
1657 } else {
1658 pr->pr_ref--;
1659 pr->pr_uref--;
1660 }
1661 }
1662 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
1663 mtx_unlock(&pr->pr_mtx);
1664
1665 #ifdef RACCT
1666 if (created)
1667 prison_racct_attach(pr);
1668 #endif
1669
1670 /* Locks may have prevented a complete restriction of child IP
1671 * addresses. If so, allocate some more memory and try again.
1672 */
1673 #ifdef INET
1674 while (redo_ip4) {
1675 ip4s = pr->pr_ip4s;
1676 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
1677 mtx_lock(&pr->pr_mtx);
1678 redo_ip4 = 0;
1679 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1680 #ifdef VIMAGE
1681 if (tpr->pr_flags & PR_VNET) {
1682 descend = 0;
1683 continue;
1684 }
1685 #endif
1686 if (prison_restrict_ip4(tpr, ip4)) {
1687 if (ip4 != NULL)
1688 ip4 = NULL;
1689 else
1690 redo_ip4 = 1;
1691 }
1692 }
1693 mtx_unlock(&pr->pr_mtx);
1694 }
1695 #endif
1696 #ifdef INET6
1697 while (redo_ip6) {
1698 ip6s = pr->pr_ip6s;
1699 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
1700 mtx_lock(&pr->pr_mtx);
1701 redo_ip6 = 0;
1702 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1703 #ifdef VIMAGE
1704 if (tpr->pr_flags & PR_VNET) {
1705 descend = 0;
1706 continue;
1707 }
1708 #endif
1709 if (prison_restrict_ip6(tpr, ip6)) {
1710 if (ip6 != NULL)
1711 ip6 = NULL;
1712 else
1713 redo_ip6 = 1;
1714 }
1715 }
1716 mtx_unlock(&pr->pr_mtx);
1717 }
1718 #endif
1719
1720 /* Let the modules do their work. */
1721 sx_downgrade(&allprison_lock);
1722 if (created) {
1723 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
1724 if (error) {
1725 prison_deref(pr, PD_LIST_SLOCKED);
1726 goto done_errmsg;
1727 }
1728 }
1729 error = osd_jail_call(pr, PR_METHOD_SET, opts);
1730 if (error) {
1731 prison_deref(pr, created
1732 ? PD_LIST_SLOCKED
1733 : PD_DEREF | PD_LIST_SLOCKED);
1734 goto done_errmsg;
1735 }
1736
1737 /* Attach this process to the prison if requested. */
1738 if (flags & JAIL_ATTACH) {
1739 mtx_lock(&pr->pr_mtx);
1740 error = do_jail_attach(td, pr);
1741 if (error) {
1742 vfs_opterror(opts, "attach failed");
1743 if (!created)
1744 prison_deref(pr, PD_DEREF);
1745 goto done_errmsg;
1746 }
1747 }
1748
1749 /*
1750 * Now that it is all there, drop the temporary reference from existing
1751 * prisons. Or add a reference to newly created persistent prisons
1752 * (which was not done earlier so that the prison would not be publicly
1753 * visible).
1754 */
1755 if (!created) {
1756 prison_deref(pr, (flags & JAIL_ATTACH)
1757 ? PD_DEREF
1758 : PD_DEREF | PD_LIST_SLOCKED);
1759 } else {
1760 if (pr_flags & PR_PERSIST) {
1761 mtx_lock(&pr->pr_mtx);
1762 pr->pr_ref++;
1763 pr->pr_uref++;
1764 mtx_unlock(&pr->pr_mtx);
1765 }
1766 if (!(flags & JAIL_ATTACH))
1767 sx_sunlock(&allprison_lock);
1768 }
1769 td->td_retval[0] = pr->pr_id;
1770 goto done_errmsg;
1771
1772 done_deref_locked:
1773 prison_deref(pr, created
1774 ? PD_LOCKED | PD_LIST_XLOCKED
1775 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
1776 goto done_releroot;
1777 done_unlock_list:
1778 sx_xunlock(&allprison_lock);
1779 done_releroot:
1780 if (root != NULL) {
1781 vfslocked = VFS_LOCK_GIANT(root->v_mount);
1782 vrele(root);
1783 VFS_UNLOCK_GIANT(vfslocked);
1784 }
1785 done_errmsg:
1786 if (error) {
1787 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
1788 if (errmsg_len > 0) {
1789 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
1790 if (errmsg_pos > 0) {
1791 if (optuio->uio_segflg == UIO_SYSSPACE)
1792 bcopy(errmsg,
1793 optuio->uio_iov[errmsg_pos].iov_base,
1794 errmsg_len);
1795 else
1796 copyout(errmsg,
1797 optuio->uio_iov[errmsg_pos].iov_base,
1798 errmsg_len);
1799 }
1800 }
1801 }
1802 done_free:
1803 #ifdef INET
1804 free(ip4, M_PRISON);
1805 #endif
1806 #ifdef INET6
1807 free(ip6, M_PRISON);
1808 #endif
1809 vfs_freeopts(opts);
1810 return (error);
1811 }
1812
1813
1814 /*
1815 * struct jail_get_args {
1816 * struct iovec *iovp;
1817 * unsigned int iovcnt;
1818 * int flags;
1819 * };
1820 */
1821 int
1822 sys_jail_get(struct thread *td, struct jail_get_args *uap)
1823 {
1824 struct uio *auio;
1825 int error;
1826
1827 /* Check that we have an even number of iovecs. */
1828 if (uap->iovcnt & 1)
1829 return (EINVAL);
1830
1831 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
1832 if (error)
1833 return (error);
1834 error = kern_jail_get(td, auio, uap->flags);
1835 if (error == 0)
1836 error = copyout(auio->uio_iov, uap->iovp,
1837 uap->iovcnt * sizeof (struct iovec));
1838 free(auio, M_IOV);
1839 return (error);
1840 }
1841
1842 int
1843 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
1844 {
1845 struct prison *pr, *mypr;
1846 struct vfsopt *opt;
1847 struct vfsoptlist *opts;
1848 char *errmsg, *name;
1849 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos;
1850
1851 if (flags & ~JAIL_GET_MASK)
1852 return (EINVAL);
1853
1854 /* Get the parameter list. */
1855 error = vfs_buildopts(optuio, &opts);
1856 if (error)
1857 return (error);
1858 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
1859 mypr = td->td_ucred->cr_prison;
1860
1861 /*
1862 * Find the prison specified by one of: lastjid, jid, name.
1863 */
1864 sx_slock(&allprison_lock);
1865 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
1866 if (error == 0) {
1867 TAILQ_FOREACH(pr, &allprison, pr_list) {
1868 if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
1869 mtx_lock(&pr->pr_mtx);
1870 if (pr->pr_ref > 0 &&
1871 (pr->pr_uref > 0 || (flags & JAIL_DYING)))
1872 break;
1873 mtx_unlock(&pr->pr_mtx);
1874 }
1875 }
1876 if (pr != NULL)
1877 goto found_prison;
1878 error = ENOENT;
1879 vfs_opterror(opts, "no jail after %d", jid);
1880 goto done_unlock_list;
1881 } else if (error != ENOENT)
1882 goto done_unlock_list;
1883
1884 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
1885 if (error == 0) {
1886 if (jid != 0) {
1887 pr = prison_find_child(mypr, jid);
1888 if (pr != NULL) {
1889 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1890 mtx_unlock(&pr->pr_mtx);
1891 error = ENOENT;
1892 vfs_opterror(opts, "jail %d is dying",
1893 jid);
1894 goto done_unlock_list;
1895 }
1896 goto found_prison;
1897 }
1898 error = ENOENT;
1899 vfs_opterror(opts, "jail %d not found", jid);
1900 goto done_unlock_list;
1901 }
1902 } else if (error != ENOENT)
1903 goto done_unlock_list;
1904
1905 error = vfs_getopt(opts, "name", (void **)&name, &len);
1906 if (error == 0) {
1907 if (len == 0 || name[len - 1] != '\0') {
1908 error = EINVAL;
1909 goto done_unlock_list;
1910 }
1911 pr = prison_find_name(mypr, name);
1912 if (pr != NULL) {
1913 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1914 mtx_unlock(&pr->pr_mtx);
1915 error = ENOENT;
1916 vfs_opterror(opts, "jail \"%s\" is dying",
1917 name);
1918 goto done_unlock_list;
1919 }
1920 goto found_prison;
1921 }
1922 error = ENOENT;
1923 vfs_opterror(opts, "jail \"%s\" not found", name);
1924 goto done_unlock_list;
1925 } else if (error != ENOENT)
1926 goto done_unlock_list;
1927
1928 vfs_opterror(opts, "no jail specified");
1929 error = ENOENT;
1930 goto done_unlock_list;
1931
1932 found_prison:
1933 /* Get the parameters of the prison. */
1934 pr->pr_ref++;
1935 locked = PD_LOCKED;
1936 td->td_retval[0] = pr->pr_id;
1937 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
1938 if (error != 0 && error != ENOENT)
1939 goto done_deref;
1940 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
1941 error = vfs_setopt(opts, "parent", &i, sizeof(i));
1942 if (error != 0 && error != ENOENT)
1943 goto done_deref;
1944 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
1945 if (error != 0 && error != ENOENT)
1946 goto done_deref;
1947 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
1948 sizeof(pr->pr_cpuset->cs_id));
1949 if (error != 0 && error != ENOENT)
1950 goto done_deref;
1951 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
1952 if (error != 0 && error != ENOENT)
1953 goto done_deref;
1954 #ifdef INET
1955 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
1956 pr->pr_ip4s * sizeof(*pr->pr_ip4));
1957 if (error != 0 && error != ENOENT)
1958 goto done_deref;
1959 #endif
1960 #ifdef INET6
1961 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
1962 pr->pr_ip6s * sizeof(*pr->pr_ip6));
1963 if (error != 0 && error != ENOENT)
1964 goto done_deref;
1965 #endif
1966 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
1967 sizeof(pr->pr_securelevel));
1968 if (error != 0 && error != ENOENT)
1969 goto done_deref;
1970 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
1971 sizeof(pr->pr_childcount));
1972 if (error != 0 && error != ENOENT)
1973 goto done_deref;
1974 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
1975 sizeof(pr->pr_childmax));
1976 if (error != 0 && error != ENOENT)
1977 goto done_deref;
1978 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
1979 if (error != 0 && error != ENOENT)
1980 goto done_deref;
1981 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
1982 if (error != 0 && error != ENOENT)
1983 goto done_deref;
1984 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
1985 if (error != 0 && error != ENOENT)
1986 goto done_deref;
1987 #ifdef COMPAT_FREEBSD32
1988 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
1989 uint32_t hid32 = pr->pr_hostid;
1990
1991 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
1992 } else
1993 #endif
1994 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
1995 sizeof(pr->pr_hostid));
1996 if (error != 0 && error != ENOENT)
1997 goto done_deref;
1998 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
1999 sizeof(pr->pr_enforce_statfs));
2000 if (error != 0 && error != ENOENT)
2001 goto done_deref;
2002 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
2003 fi++) {
2004 if (pr_flag_names[fi] == NULL)
2005 continue;
2006 i = (pr->pr_flags & (1 << fi)) ? 1 : 0;
2007 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i));
2008 if (error != 0 && error != ENOENT)
2009 goto done_deref;
2010 i = !i;
2011 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i));
2012 if (error != 0 && error != ENOENT)
2013 goto done_deref;
2014 }
2015 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
2016 fi++) {
2017 i = pr->pr_flags &
2018 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
2019 i = pr_flag_jailsys[fi].disable &&
2020 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE
2021 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW
2022 : JAIL_SYS_INHERIT;
2023 error =
2024 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i));
2025 if (error != 0 && error != ENOENT)
2026 goto done_deref;
2027 }
2028 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
2029 fi++) {
2030 if (pr_allow_names[fi] == NULL)
2031 continue;
2032 i = (pr->pr_allow & (1 << fi)) ? 1 : 0;
2033 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i));
2034 if (error != 0 && error != ENOENT)
2035 goto done_deref;
2036 i = !i;
2037 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i));
2038 if (error != 0 && error != ENOENT)
2039 goto done_deref;
2040 }
2041 i = (pr->pr_uref == 0);
2042 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2043 if (error != 0 && error != ENOENT)
2044 goto done_deref;
2045 i = !i;
2046 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2047 if (error != 0 && error != ENOENT)
2048 goto done_deref;
2049
2050 /* Get the module parameters. */
2051 mtx_unlock(&pr->pr_mtx);
2052 locked = 0;
2053 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2054 if (error)
2055 goto done_deref;
2056 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
2057
2058 /* By now, all parameters should have been noted. */
2059 TAILQ_FOREACH(opt, opts, link) {
2060 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2061 error = EINVAL;
2062 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2063 goto done_errmsg;
2064 }
2065 }
2066
2067 /* Write the fetched parameters back to userspace. */
2068 error = 0;
2069 TAILQ_FOREACH(opt, opts, link) {
2070 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2071 pos = 2 * opt->pos + 1;
2072 optuio->uio_iov[pos].iov_len = opt->len;
2073 if (opt->value != NULL) {
2074 if (optuio->uio_segflg == UIO_SYSSPACE) {
2075 bcopy(opt->value,
2076 optuio->uio_iov[pos].iov_base,
2077 opt->len);
2078 } else {
2079 error = copyout(opt->value,
2080 optuio->uio_iov[pos].iov_base,
2081 opt->len);
2082 if (error)
2083 break;
2084 }
2085 }
2086 }
2087 }
2088 goto done_errmsg;
2089
2090 done_deref:
2091 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
2092 goto done_errmsg;
2093
2094 done_unlock_list:
2095 sx_sunlock(&allprison_lock);
2096 done_errmsg:
2097 if (error && errmsg_pos >= 0) {
2098 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2099 errmsg_pos = 2 * errmsg_pos + 1;
2100 if (errmsg_len > 0) {
2101 if (optuio->uio_segflg == UIO_SYSSPACE)
2102 bcopy(errmsg,
2103 optuio->uio_iov[errmsg_pos].iov_base,
2104 errmsg_len);
2105 else
2106 copyout(errmsg,
2107 optuio->uio_iov[errmsg_pos].iov_base,
2108 errmsg_len);
2109 }
2110 }
2111 vfs_freeopts(opts);
2112 return (error);
2113 }
2114
2115
2116 /*
2117 * struct jail_remove_args {
2118 * int jid;
2119 * };
2120 */
2121 int
2122 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
2123 {
2124 struct prison *pr, *cpr, *lpr, *tpr;
2125 int descend, error;
2126
2127 error = priv_check(td, PRIV_JAIL_REMOVE);
2128 if (error)
2129 return (error);
2130
2131 sx_xlock(&allprison_lock);
2132 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2133 if (pr == NULL) {
2134 sx_xunlock(&allprison_lock);
2135 return (EINVAL);
2136 }
2137
2138 /* Remove all descendants of this prison, then remove this prison. */
2139 pr->pr_ref++;
2140 pr->pr_flags |= PR_REMOVE;
2141 if (!LIST_EMPTY(&pr->pr_children)) {
2142 mtx_unlock(&pr->pr_mtx);
2143 lpr = NULL;
2144 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
2145 mtx_lock(&cpr->pr_mtx);
2146 if (cpr->pr_ref > 0) {
2147 tpr = cpr;
2148 cpr->pr_ref++;
2149 cpr->pr_flags |= PR_REMOVE;
2150 } else {
2151 /* Already removed - do not do it again. */
2152 tpr = NULL;
2153 }
2154 mtx_unlock(&cpr->pr_mtx);
2155 if (lpr != NULL) {
2156 mtx_lock(&lpr->pr_mtx);
2157 prison_remove_one(lpr);
2158 sx_xlock(&allprison_lock);
2159 }
2160 lpr = tpr;
2161 }
2162 if (lpr != NULL) {
2163 mtx_lock(&lpr->pr_mtx);
2164 prison_remove_one(lpr);
2165 sx_xlock(&allprison_lock);
2166 }
2167 mtx_lock(&pr->pr_mtx);
2168 }
2169 prison_remove_one(pr);
2170 return (0);
2171 }
2172
2173 static void
2174 prison_remove_one(struct prison *pr)
2175 {
2176 struct proc *p;
2177 int deuref;
2178
2179 /* If the prison was persistent, it is not anymore. */
2180 deuref = 0;
2181 if (pr->pr_flags & PR_PERSIST) {
2182 pr->pr_ref--;
2183 deuref = PD_DEUREF;
2184 pr->pr_flags &= ~PR_PERSIST;
2185 }
2186
2187 /*
2188 * jail_remove added a reference. If that's the only one, remove
2189 * the prison now.
2190 */
2191 KASSERT(pr->pr_ref > 0,
2192 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
2193 if (pr->pr_ref == 1) {
2194 prison_deref(pr,
2195 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
2196 return;
2197 }
2198
2199 mtx_unlock(&pr->pr_mtx);
2200 sx_xunlock(&allprison_lock);
2201 /*
2202 * Kill all processes unfortunate enough to be attached to this prison.
2203 */
2204 sx_slock(&allproc_lock);
2205 LIST_FOREACH(p, &allproc, p_list) {
2206 PROC_LOCK(p);
2207 if (p->p_state != PRS_NEW && p->p_ucred &&
2208 p->p_ucred->cr_prison == pr)
2209 kern_psignal(p, SIGKILL);
2210 PROC_UNLOCK(p);
2211 }
2212 sx_sunlock(&allproc_lock);
2213 /* Remove the temporary reference added by jail_remove. */
2214 prison_deref(pr, deuref | PD_DEREF);
2215 }
2216
2217
2218 /*
2219 * struct jail_attach_args {
2220 * int jid;
2221 * };
2222 */
2223 int
2224 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
2225 {
2226 struct prison *pr;
2227 int error;
2228
2229 error = priv_check(td, PRIV_JAIL_ATTACH);
2230 if (error)
2231 return (error);
2232
2233 sx_slock(&allprison_lock);
2234 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2235 if (pr == NULL) {
2236 sx_sunlock(&allprison_lock);
2237 return (EINVAL);
2238 }
2239
2240 /*
2241 * Do not allow a process to attach to a prison that is not
2242 * considered to be "alive".
2243 */
2244 if (pr->pr_uref == 0) {
2245 mtx_unlock(&pr->pr_mtx);
2246 sx_sunlock(&allprison_lock);
2247 return (EINVAL);
2248 }
2249
2250 return (do_jail_attach(td, pr));
2251 }
2252
2253 static int
2254 do_jail_attach(struct thread *td, struct prison *pr)
2255 {
2256 struct prison *ppr;
2257 struct proc *p;
2258 struct ucred *newcred, *oldcred;
2259 int vfslocked, error;
2260
2261 /*
2262 * XXX: Note that there is a slight race here if two threads
2263 * in the same privileged process attempt to attach to two
2264 * different jails at the same time. It is important for
2265 * user processes not to do this, or they might end up with
2266 * a process root from one prison, but attached to the jail
2267 * of another.
2268 */
2269 pr->pr_ref++;
2270 pr->pr_uref++;
2271 mtx_unlock(&pr->pr_mtx);
2272
2273 /* Let modules do whatever they need to prepare for attaching. */
2274 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
2275 if (error) {
2276 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
2277 return (error);
2278 }
2279 sx_sunlock(&allprison_lock);
2280
2281 /*
2282 * Reparent the newly attached process to this jail.
2283 */
2284 ppr = td->td_ucred->cr_prison;
2285 p = td->td_proc;
2286 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
2287 if (error)
2288 goto e_revert_osd;
2289
2290 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
2291 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
2292 if ((error = change_dir(pr->pr_root, td)) != 0)
2293 goto e_unlock;
2294 #ifdef MAC
2295 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
2296 goto e_unlock;
2297 #endif
2298 VOP_UNLOCK(pr->pr_root, 0);
2299 if ((error = change_root(pr->pr_root, td)))
2300 goto e_unlock_giant;
2301 VFS_UNLOCK_GIANT(vfslocked);
2302
2303 newcred = crget();
2304 PROC_LOCK(p);
2305 oldcred = p->p_ucred;
2306 setsugid(p);
2307 crcopy(newcred, oldcred);
2308 newcred->cr_prison = pr;
2309 p->p_ucred = newcred;
2310 PROC_UNLOCK(p);
2311 #ifdef RACCT
2312 racct_proc_ucred_changed(p, oldcred, newcred);
2313 #endif
2314 crfree(oldcred);
2315 prison_deref(ppr, PD_DEREF | PD_DEUREF);
2316 return (0);
2317 e_unlock:
2318 VOP_UNLOCK(pr->pr_root, 0);
2319 e_unlock_giant:
2320 VFS_UNLOCK_GIANT(vfslocked);
2321 e_revert_osd:
2322 /* Tell modules this thread is still in its old jail after all. */
2323 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td);
2324 prison_deref(pr, PD_DEREF | PD_DEUREF);
2325 return (error);
2326 }
2327
2328
2329 /*
2330 * Returns a locked prison instance, or NULL on failure.
2331 */
2332 struct prison *
2333 prison_find(int prid)
2334 {
2335 struct prison *pr;
2336
2337 sx_assert(&allprison_lock, SX_LOCKED);
2338 TAILQ_FOREACH(pr, &allprison, pr_list) {
2339 if (pr->pr_id == prid) {
2340 mtx_lock(&pr->pr_mtx);
2341 if (pr->pr_ref > 0)
2342 return (pr);
2343 mtx_unlock(&pr->pr_mtx);
2344 }
2345 }
2346 return (NULL);
2347 }
2348
2349 /*
2350 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
2351 */
2352 struct prison *
2353 prison_find_child(struct prison *mypr, int prid)
2354 {
2355 struct prison *pr;
2356 int descend;
2357
2358 sx_assert(&allprison_lock, SX_LOCKED);
2359 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2360 if (pr->pr_id == prid) {
2361 mtx_lock(&pr->pr_mtx);
2362 if (pr->pr_ref > 0)
2363 return (pr);
2364 mtx_unlock(&pr->pr_mtx);
2365 }
2366 }
2367 return (NULL);
2368 }
2369
2370 /*
2371 * Look for the name relative to mypr. Returns a locked prison or NULL.
2372 */
2373 struct prison *
2374 prison_find_name(struct prison *mypr, const char *name)
2375 {
2376 struct prison *pr, *deadpr;
2377 size_t mylen;
2378 int descend;
2379
2380 sx_assert(&allprison_lock, SX_LOCKED);
2381 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
2382 again:
2383 deadpr = NULL;
2384 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2385 if (!strcmp(pr->pr_name + mylen, name)) {
2386 mtx_lock(&pr->pr_mtx);
2387 if (pr->pr_ref > 0) {
2388 if (pr->pr_uref > 0)
2389 return (pr);
2390 deadpr = pr;
2391 }
2392 mtx_unlock(&pr->pr_mtx);
2393 }
2394 }
2395 /* There was no valid prison - perhaps there was a dying one. */
2396 if (deadpr != NULL) {
2397 mtx_lock(&deadpr->pr_mtx);
2398 if (deadpr->pr_ref == 0) {
2399 mtx_unlock(&deadpr->pr_mtx);
2400 goto again;
2401 }
2402 }
2403 return (deadpr);
2404 }
2405
2406 /*
2407 * See if a prison has the specific flag set.
2408 */
2409 int
2410 prison_flag(struct ucred *cred, unsigned flag)
2411 {
2412
2413 /* This is an atomic read, so no locking is necessary. */
2414 return (cred->cr_prison->pr_flags & flag);
2415 }
2416
2417 int
2418 prison_allow(struct ucred *cred, unsigned flag)
2419 {
2420
2421 /* This is an atomic read, so no locking is necessary. */
2422 return (cred->cr_prison->pr_allow & flag);
2423 }
2424
2425 /*
2426 * Remove a prison reference. If that was the last reference, remove the
2427 * prison itself - but not in this context in case there are locks held.
2428 */
2429 void
2430 prison_free_locked(struct prison *pr)
2431 {
2432
2433 mtx_assert(&pr->pr_mtx, MA_OWNED);
2434 pr->pr_ref--;
2435 if (pr->pr_ref == 0) {
2436 mtx_unlock(&pr->pr_mtx);
2437 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
2438 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2439 return;
2440 }
2441 mtx_unlock(&pr->pr_mtx);
2442 }
2443
2444 void
2445 prison_free(struct prison *pr)
2446 {
2447
2448 mtx_lock(&pr->pr_mtx);
2449 prison_free_locked(pr);
2450 }
2451
2452 static void
2453 prison_complete(void *context, int pending)
2454 {
2455
2456 prison_deref((struct prison *)context, 0);
2457 }
2458
2459 /*
2460 * Remove a prison reference (usually). This internal version assumes no
2461 * mutexes are held, except perhaps the prison itself. If there are no more
2462 * references, release and delist the prison. On completion, the prison lock
2463 * and the allprison lock are both unlocked.
2464 */
2465 static void
2466 prison_deref(struct prison *pr, int flags)
2467 {
2468 struct prison *ppr, *tpr;
2469 int vfslocked;
2470
2471 if (!(flags & PD_LOCKED))
2472 mtx_lock(&pr->pr_mtx);
2473 for (;;) {
2474 if (flags & PD_DEUREF) {
2475 pr->pr_uref--;
2476 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0"));
2477 }
2478 if (flags & PD_DEREF)
2479 pr->pr_ref--;
2480 /* If the prison still has references, nothing else to do. */
2481 if (pr->pr_ref > 0) {
2482 mtx_unlock(&pr->pr_mtx);
2483 if (flags & PD_LIST_SLOCKED)
2484 sx_sunlock(&allprison_lock);
2485 else if (flags & PD_LIST_XLOCKED)
2486 sx_xunlock(&allprison_lock);
2487 return;
2488 }
2489
2490 mtx_unlock(&pr->pr_mtx);
2491 if (flags & PD_LIST_SLOCKED) {
2492 if (!sx_try_upgrade(&allprison_lock)) {
2493 sx_sunlock(&allprison_lock);
2494 sx_xlock(&allprison_lock);
2495 }
2496 } else if (!(flags & PD_LIST_XLOCKED))
2497 sx_xlock(&allprison_lock);
2498
2499 TAILQ_REMOVE(&allprison, pr, pr_list);
2500 LIST_REMOVE(pr, pr_sibling);
2501 ppr = pr->pr_parent;
2502 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
2503 tpr->pr_childcount--;
2504 sx_xunlock(&allprison_lock);
2505
2506 #ifdef VIMAGE
2507 if (pr->pr_vnet != ppr->pr_vnet)
2508 vnet_destroy(pr->pr_vnet);
2509 #endif
2510 if (pr->pr_root != NULL) {
2511 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
2512 vrele(pr->pr_root);
2513 VFS_UNLOCK_GIANT(vfslocked);
2514 }
2515 mtx_destroy(&pr->pr_mtx);
2516 #ifdef INET
2517 free(pr->pr_ip4, M_PRISON);
2518 #endif
2519 #ifdef INET6
2520 free(pr->pr_ip6, M_PRISON);
2521 #endif
2522 if (pr->pr_cpuset != NULL)
2523 cpuset_rel(pr->pr_cpuset);
2524 osd_jail_exit(pr);
2525 #ifdef RACCT
2526 prison_racct_detach(pr);
2527 #endif
2528 free(pr, M_PRISON);
2529
2530 /* Removing a prison frees a reference on its parent. */
2531 pr = ppr;
2532 mtx_lock(&pr->pr_mtx);
2533 flags = PD_DEREF | PD_DEUREF;
2534 }
2535 }
2536
2537 void
2538 prison_hold_locked(struct prison *pr)
2539 {
2540
2541 mtx_assert(&pr->pr_mtx, MA_OWNED);
2542 KASSERT(pr->pr_ref > 0,
2543 ("Trying to hold dead prison (jid=%d).", pr->pr_id));
2544 pr->pr_ref++;
2545 }
2546
2547 void
2548 prison_hold(struct prison *pr)
2549 {
2550
2551 mtx_lock(&pr->pr_mtx);
2552 prison_hold_locked(pr);
2553 mtx_unlock(&pr->pr_mtx);
2554 }
2555
2556 void
2557 prison_proc_hold(struct prison *pr)
2558 {
2559
2560 mtx_lock(&pr->pr_mtx);
2561 KASSERT(pr->pr_uref > 0,
2562 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
2563 pr->pr_uref++;
2564 mtx_unlock(&pr->pr_mtx);
2565 }
2566
2567 void
2568 prison_proc_free(struct prison *pr)
2569 {
2570
2571 mtx_lock(&pr->pr_mtx);
2572 KASSERT(pr->pr_uref > 0,
2573 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
2574 prison_deref(pr, PD_DEUREF | PD_LOCKED);
2575 }
2576
2577
2578 #ifdef INET
2579 /*
2580 * Restrict a prison's IP address list with its parent's, possibly replacing
2581 * it. Return true if the replacement buffer was used (or would have been).
2582 */
2583 static int
2584 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
2585 {
2586 int ii, ij, used;
2587 struct prison *ppr;
2588
2589 ppr = pr->pr_parent;
2590 if (!(pr->pr_flags & PR_IP4_USER)) {
2591 /* This has no user settings, so just copy the parent's list. */
2592 if (pr->pr_ip4s < ppr->pr_ip4s) {
2593 /*
2594 * There's no room for the parent's list. Use the
2595 * new list buffer, which is assumed to be big enough
2596 * (if it was passed). If there's no buffer, try to
2597 * allocate one.
2598 */
2599 used = 1;
2600 if (newip4 == NULL) {
2601 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
2602 M_PRISON, M_NOWAIT);
2603 if (newip4 != NULL)
2604 used = 0;
2605 }
2606 if (newip4 != NULL) {
2607 bcopy(ppr->pr_ip4, newip4,
2608 ppr->pr_ip4s * sizeof(*newip4));
2609 free(pr->pr_ip4, M_PRISON);
2610 pr->pr_ip4 = newip4;
2611 pr->pr_ip4s = ppr->pr_ip4s;
2612 }
2613 return (used);
2614 }
2615 pr->pr_ip4s = ppr->pr_ip4s;
2616 if (pr->pr_ip4s > 0)
2617 bcopy(ppr->pr_ip4, pr->pr_ip4,
2618 pr->pr_ip4s * sizeof(*newip4));
2619 else if (pr->pr_ip4 != NULL) {
2620 free(pr->pr_ip4, M_PRISON);
2621 pr->pr_ip4 = NULL;
2622 }
2623 } else if (pr->pr_ip4s > 0) {
2624 /* Remove addresses that aren't in the parent. */
2625 for (ij = 0; ij < ppr->pr_ip4s; ij++)
2626 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
2627 break;
2628 if (ij < ppr->pr_ip4s)
2629 ii = 1;
2630 else {
2631 bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
2632 --pr->pr_ip4s * sizeof(*pr->pr_ip4));
2633 ii = 0;
2634 }
2635 for (ij = 1; ii < pr->pr_ip4s; ) {
2636 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
2637 ii++;
2638 continue;
2639 }
2640 switch (ij >= ppr->pr_ip4s ? -1 :
2641 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
2642 case -1:
2643 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
2644 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
2645 break;
2646 case 0:
2647 ii++;
2648 ij++;
2649 break;
2650 case 1:
2651 ij++;
2652 break;
2653 }
2654 }
2655 if (pr->pr_ip4s == 0) {
2656 pr->pr_flags |= PR_IP4_DISABLE;
2657 free(pr->pr_ip4, M_PRISON);
2658 pr->pr_ip4 = NULL;
2659 }
2660 }
2661 return (0);
2662 }
2663
2664 /*
2665 * Pass back primary IPv4 address of this jail.
2666 *
2667 * If not restricted return success but do not alter the address. Caller has
2668 * to make sure to initialize it correctly (e.g. INADDR_ANY).
2669 *
2670 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2671 * Address returned in NBO.
2672 */
2673 int
2674 prison_get_ip4(struct ucred *cred, struct in_addr *ia)
2675 {
2676 struct prison *pr;
2677
2678 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2679 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2680
2681 pr = cred->cr_prison;
2682 if (!(pr->pr_flags & PR_IP4))
2683 return (0);
2684 mtx_lock(&pr->pr_mtx);
2685 if (!(pr->pr_flags & PR_IP4)) {
2686 mtx_unlock(&pr->pr_mtx);
2687 return (0);
2688 }
2689 if (pr->pr_ip4 == NULL) {
2690 mtx_unlock(&pr->pr_mtx);
2691 return (EAFNOSUPPORT);
2692 }
2693
2694 ia->s_addr = pr->pr_ip4[0].s_addr;
2695 mtx_unlock(&pr->pr_mtx);
2696 return (0);
2697 }
2698
2699 /*
2700 * Return 1 if we should do proper source address selection or are not jailed.
2701 * We will return 0 if we should bypass source address selection in favour
2702 * of the primary jail IPv4 address. Only in this case *ia will be updated and
2703 * returned in NBO.
2704 * Return EAFNOSUPPORT, in case this jail does not allow IPv4.
2705 */
2706 int
2707 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
2708 {
2709 struct prison *pr;
2710 struct in_addr lia;
2711 int error;
2712
2713 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2714 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2715
2716 if (!jailed(cred))
2717 return (1);
2718
2719 pr = cred->cr_prison;
2720 if (pr->pr_flags & PR_IP4_SADDRSEL)
2721 return (1);
2722
2723 lia.s_addr = INADDR_ANY;
2724 error = prison_get_ip4(cred, &lia);
2725 if (error)
2726 return (error);
2727 if (lia.s_addr == INADDR_ANY)
2728 return (1);
2729
2730 ia->s_addr = lia.s_addr;
2731 return (0);
2732 }
2733
2734 /*
2735 * Return true if pr1 and pr2 have the same IPv4 address restrictions.
2736 */
2737 int
2738 prison_equal_ip4(struct prison *pr1, struct prison *pr2)
2739 {
2740
2741 if (pr1 == pr2)
2742 return (1);
2743
2744 /*
2745 * No need to lock since the PR_IP4_USER flag can't be altered for
2746 * existing prisons.
2747 */
2748 while (pr1 != &prison0 &&
2749 #ifdef VIMAGE
2750 !(pr1->pr_flags & PR_VNET) &&
2751 #endif
2752 !(pr1->pr_flags & PR_IP4_USER))
2753 pr1 = pr1->pr_parent;
2754 while (pr2 != &prison0 &&
2755 #ifdef VIMAGE
2756 !(pr2->pr_flags & PR_VNET) &&
2757 #endif
2758 !(pr2->pr_flags & PR_IP4_USER))
2759 pr2 = pr2->pr_parent;
2760 return (pr1 == pr2);
2761 }
2762
2763 /*
2764 * Make sure our (source) address is set to something meaningful to this
2765 * jail.
2766 *
2767 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2768 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2769 * doesn't allow IPv4. Address passed in in NBO and returned in NBO.
2770 */
2771 int
2772 prison_local_ip4(struct ucred *cred, struct in_addr *ia)
2773 {
2774 struct prison *pr;
2775 struct in_addr ia0;
2776 int error;
2777
2778 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2779 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2780
2781 pr = cred->cr_prison;
2782 if (!(pr->pr_flags & PR_IP4))
2783 return (0);
2784 mtx_lock(&pr->pr_mtx);
2785 if (!(pr->pr_flags & PR_IP4)) {
2786 mtx_unlock(&pr->pr_mtx);
2787 return (0);
2788 }
2789 if (pr->pr_ip4 == NULL) {
2790 mtx_unlock(&pr->pr_mtx);
2791 return (EAFNOSUPPORT);
2792 }
2793
2794 ia0.s_addr = ntohl(ia->s_addr);
2795 if (ia0.s_addr == INADDR_LOOPBACK) {
2796 ia->s_addr = pr->pr_ip4[0].s_addr;
2797 mtx_unlock(&pr->pr_mtx);
2798 return (0);
2799 }
2800
2801 if (ia0.s_addr == INADDR_ANY) {
2802 /*
2803 * In case there is only 1 IPv4 address, bind directly.
2804 */
2805 if (pr->pr_ip4s == 1)
2806 ia->s_addr = pr->pr_ip4[0].s_addr;
2807 mtx_unlock(&pr->pr_mtx);
2808 return (0);
2809 }
2810
2811 error = _prison_check_ip4(pr, ia);
2812 mtx_unlock(&pr->pr_mtx);
2813 return (error);
2814 }
2815
2816 /*
2817 * Rewrite destination address in case we will connect to loopback address.
2818 *
2819 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2820 * Address passed in in NBO and returned in NBO.
2821 */
2822 int
2823 prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
2824 {
2825 struct prison *pr;
2826
2827 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2828 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2829
2830 pr = cred->cr_prison;
2831 if (!(pr->pr_flags & PR_IP4))
2832 return (0);
2833 mtx_lock(&pr->pr_mtx);
2834 if (!(pr->pr_flags & PR_IP4)) {
2835 mtx_unlock(&pr->pr_mtx);
2836 return (0);
2837 }
2838 if (pr->pr_ip4 == NULL) {
2839 mtx_unlock(&pr->pr_mtx);
2840 return (EAFNOSUPPORT);
2841 }
2842
2843 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) {
2844 ia->s_addr = pr->pr_ip4[0].s_addr;
2845 mtx_unlock(&pr->pr_mtx);
2846 return (0);
2847 }
2848
2849 /*
2850 * Return success because nothing had to be changed.
2851 */
2852 mtx_unlock(&pr->pr_mtx);
2853 return (0);
2854 }
2855
2856 /*
2857 * Check if given address belongs to the jail referenced by cred/prison.
2858 *
2859 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2860 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2861 * doesn't allow IPv4. Address passed in in NBO.
2862 */
2863 static int
2864 _prison_check_ip4(struct prison *pr, struct in_addr *ia)
2865 {
2866 int i, a, z, d;
2867
2868 /*
2869 * Check the primary IP.
2870 */
2871 if (pr->pr_ip4[0].s_addr == ia->s_addr)
2872 return (0);
2873
2874 /*
2875 * All the other IPs are sorted so we can do a binary search.
2876 */
2877 a = 0;
2878 z = pr->pr_ip4s - 2;
2879 while (a <= z) {
2880 i = (a + z) / 2;
2881 d = qcmp_v4(&pr->pr_ip4[i+1], ia);
2882 if (d > 0)
2883 z = i - 1;
2884 else if (d < 0)
2885 a = i + 1;
2886 else
2887 return (0);
2888 }
2889
2890 return (EADDRNOTAVAIL);
2891 }
2892
2893 int
2894 prison_check_ip4(struct ucred *cred, struct in_addr *ia)
2895 {
2896 struct prison *pr;
2897 int error;
2898
2899 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2900 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2901
2902 pr = cred->cr_prison;
2903 if (!(pr->pr_flags & PR_IP4))
2904 return (0);
2905 mtx_lock(&pr->pr_mtx);
2906 if (!(pr->pr_flags & PR_IP4)) {
2907 mtx_unlock(&pr->pr_mtx);
2908 return (0);
2909 }
2910 if (pr->pr_ip4 == NULL) {
2911 mtx_unlock(&pr->pr_mtx);
2912 return (EAFNOSUPPORT);
2913 }
2914
2915 error = _prison_check_ip4(pr, ia);
2916 mtx_unlock(&pr->pr_mtx);
2917 return (error);
2918 }
2919 #endif
2920
2921 #ifdef INET6
2922 static int
2923 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
2924 {
2925 int ii, ij, used;
2926 struct prison *ppr;
2927
2928 ppr = pr->pr_parent;
2929 if (!(pr->pr_flags & PR_IP6_USER)) {
2930 /* This has no user settings, so just copy the parent's list. */
2931 if (pr->pr_ip6s < ppr->pr_ip6s) {
2932 /*
2933 * There's no room for the parent's list. Use the
2934 * new list buffer, which is assumed to be big enough
2935 * (if it was passed). If there's no buffer, try to
2936 * allocate one.
2937 */
2938 used = 1;
2939 if (newip6 == NULL) {
2940 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
2941 M_PRISON, M_NOWAIT);
2942 if (newip6 != NULL)
2943 used = 0;
2944 }
2945 if (newip6 != NULL) {
2946 bcopy(ppr->pr_ip6, newip6,
2947 ppr->pr_ip6s * sizeof(*newip6));
2948 free(pr->pr_ip6, M_PRISON);
2949 pr->pr_ip6 = newip6;
2950 pr->pr_ip6s = ppr->pr_ip6s;
2951 }
2952 return (used);
2953 }
2954 pr->pr_ip6s = ppr->pr_ip6s;
2955 if (pr->pr_ip6s > 0)
2956 bcopy(ppr->pr_ip6, pr->pr_ip6,
2957 pr->pr_ip6s * sizeof(*newip6));
2958 else if (pr->pr_ip6 != NULL) {
2959 free(pr->pr_ip6, M_PRISON);
2960 pr->pr_ip6 = NULL;
2961 }
2962 } else if (pr->pr_ip6s > 0) {
2963 /* Remove addresses that aren't in the parent. */
2964 for (ij = 0; ij < ppr->pr_ip6s; ij++)
2965 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
2966 &ppr->pr_ip6[ij]))
2967 break;
2968 if (ij < ppr->pr_ip6s)
2969 ii = 1;
2970 else {
2971 bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
2972 --pr->pr_ip6s * sizeof(*pr->pr_ip6));
2973 ii = 0;
2974 }
2975 for (ij = 1; ii < pr->pr_ip6s; ) {
2976 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
2977 &ppr->pr_ip6[0])) {
2978 ii++;
2979 continue;
2980 }
2981 switch (ij >= ppr->pr_ip4s ? -1 :
2982 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
2983 case -1:
2984 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
2985 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
2986 break;
2987 case 0:
2988 ii++;
2989 ij++;
2990 break;
2991 case 1:
2992 ij++;
2993 break;
2994 }
2995 }
2996 if (pr->pr_ip6s == 0) {
2997 pr->pr_flags |= PR_IP6_DISABLE;
2998 free(pr->pr_ip6, M_PRISON);
2999 pr->pr_ip6 = NULL;
3000 }
3001 }
3002 return 0;
3003 }
3004
3005 /*
3006 * Pass back primary IPv6 address for this jail.
3007 *
3008 * If not restricted return success but do not alter the address. Caller has
3009 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
3010 *
3011 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3012 */
3013 int
3014 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
3015 {
3016 struct prison *pr;
3017
3018 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3019 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3020
3021 pr = cred->cr_prison;
3022 if (!(pr->pr_flags & PR_IP6))
3023 return (0);
3024 mtx_lock(&pr->pr_mtx);
3025 if (!(pr->pr_flags & PR_IP6)) {
3026 mtx_unlock(&pr->pr_mtx);
3027 return (0);
3028 }
3029 if (pr->pr_ip6 == NULL) {
3030 mtx_unlock(&pr->pr_mtx);
3031 return (EAFNOSUPPORT);
3032 }
3033
3034 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3035 mtx_unlock(&pr->pr_mtx);
3036 return (0);
3037 }
3038
3039 /*
3040 * Return 1 if we should do proper source address selection or are not jailed.
3041 * We will return 0 if we should bypass source address selection in favour
3042 * of the primary jail IPv6 address. Only in this case *ia will be updated and
3043 * returned in NBO.
3044 * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
3045 */
3046 int
3047 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
3048 {
3049 struct prison *pr;
3050 struct in6_addr lia6;
3051 int error;
3052
3053 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3054 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3055
3056 if (!jailed(cred))
3057 return (1);
3058
3059 pr = cred->cr_prison;
3060 if (pr->pr_flags & PR_IP6_SADDRSEL)
3061 return (1);
3062
3063 lia6 = in6addr_any;
3064 error = prison_get_ip6(cred, &lia6);
3065 if (error)
3066 return (error);
3067 if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
3068 return (1);
3069
3070 bcopy(&lia6, ia6, sizeof(struct in6_addr));
3071 return (0);
3072 }
3073
3074 /*
3075 * Return true if pr1 and pr2 have the same IPv6 address restrictions.
3076 */
3077 int
3078 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
3079 {
3080
3081 if (pr1 == pr2)
3082 return (1);
3083
3084 while (pr1 != &prison0 &&
3085 #ifdef VIMAGE
3086 !(pr1->pr_flags & PR_VNET) &&
3087 #endif
3088 !(pr1->pr_flags & PR_IP6_USER))
3089 pr1 = pr1->pr_parent;
3090 while (pr2 != &prison0 &&
3091 #ifdef VIMAGE
3092 !(pr2->pr_flags & PR_VNET) &&
3093 #endif
3094 !(pr2->pr_flags & PR_IP6_USER))
3095 pr2 = pr2->pr_parent;
3096 return (pr1 == pr2);
3097 }
3098
3099 /*
3100 * Make sure our (source) address is set to something meaningful to this jail.
3101 *
3102 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
3103 * when needed while binding.
3104 *
3105 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3106 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3107 * doesn't allow IPv6.
3108 */
3109 int
3110 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
3111 {
3112 struct prison *pr;
3113 int error;
3114
3115 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3116 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3117
3118 pr = cred->cr_prison;
3119 if (!(pr->pr_flags & PR_IP6))
3120 return (0);
3121 mtx_lock(&pr->pr_mtx);
3122 if (!(pr->pr_flags & PR_IP6)) {
3123 mtx_unlock(&pr->pr_mtx);
3124 return (0);
3125 }
3126 if (pr->pr_ip6 == NULL) {
3127 mtx_unlock(&pr->pr_mtx);
3128 return (EAFNOSUPPORT);
3129 }
3130
3131 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3132 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3133 mtx_unlock(&pr->pr_mtx);
3134 return (0);
3135 }
3136
3137 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
3138 /*
3139 * In case there is only 1 IPv6 address, and v6only is true,
3140 * then bind directly.
3141 */
3142 if (v6only != 0 && pr->pr_ip6s == 1)
3143 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3144 mtx_unlock(&pr->pr_mtx);
3145 return (0);
3146 }
3147
3148 error = _prison_check_ip6(pr, ia6);
3149 mtx_unlock(&pr->pr_mtx);
3150 return (error);
3151 }
3152
3153 /*
3154 * Rewrite destination address in case we will connect to loopback address.
3155 *
3156 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3157 */
3158 int
3159 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
3160 {
3161 struct prison *pr;
3162
3163 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3164 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3165
3166 pr = cred->cr_prison;
3167 if (!(pr->pr_flags & PR_IP6))
3168 return (0);
3169 mtx_lock(&pr->pr_mtx);
3170 if (!(pr->pr_flags & PR_IP6)) {
3171 mtx_unlock(&pr->pr_mtx);
3172 return (0);
3173 }
3174 if (pr->pr_ip6 == NULL) {
3175 mtx_unlock(&pr->pr_mtx);
3176 return (EAFNOSUPPORT);
3177 }
3178
3179 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3180 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3181 mtx_unlock(&pr->pr_mtx);
3182 return (0);
3183 }
3184
3185 /*
3186 * Return success because nothing had to be changed.
3187 */
3188 mtx_unlock(&pr->pr_mtx);
3189 return (0);
3190 }
3191
3192 /*
3193 * Check if given address belongs to the jail referenced by cred/prison.
3194 *
3195 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3196 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3197 * doesn't allow IPv6.
3198 */
3199 static int
3200 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6)
3201 {
3202 int i, a, z, d;
3203
3204 /*
3205 * Check the primary IP.
3206 */
3207 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
3208 return (0);
3209
3210 /*
3211 * All the other IPs are sorted so we can do a binary search.
3212 */
3213 a = 0;
3214 z = pr->pr_ip6s - 2;
3215 while (a <= z) {
3216 i = (a + z) / 2;
3217 d = qcmp_v6(&pr->pr_ip6[i+1], ia6);
3218 if (d > 0)
3219 z = i - 1;
3220 else if (d < 0)
3221 a = i + 1;
3222 else
3223 return (0);
3224 }
3225
3226 return (EADDRNOTAVAIL);
3227 }
3228
3229 int
3230 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6)
3231 {
3232 struct prison *pr;
3233 int error;
3234
3235 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3236 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3237
3238 pr = cred->cr_prison;
3239 if (!(pr->pr_flags & PR_IP6))
3240 return (0);
3241 mtx_lock(&pr->pr_mtx);
3242 if (!(pr->pr_flags & PR_IP6)) {
3243 mtx_unlock(&pr->pr_mtx);
3244 return (0);
3245 }
3246 if (pr->pr_ip6 == NULL) {
3247 mtx_unlock(&pr->pr_mtx);
3248 return (EAFNOSUPPORT);
3249 }
3250
3251 error = _prison_check_ip6(pr, ia6);
3252 mtx_unlock(&pr->pr_mtx);
3253 return (error);
3254 }
3255 #endif
3256
3257 /*
3258 * Check if a jail supports the given address family.
3259 *
3260 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
3261 * if not.
3262 */
3263 int
3264 prison_check_af(struct ucred *cred, int af)
3265 {
3266 struct prison *pr;
3267 int error;
3268
3269 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3270
3271 pr = cred->cr_prison;
3272 #ifdef VIMAGE
3273 /* Prisons with their own network stack are not limited. */
3274 if (prison_owns_vnet(cred))
3275 return (0);
3276 #endif
3277
3278 error = 0;
3279 switch (af)
3280 {
3281 #ifdef INET
3282 case AF_INET:
3283 if (pr->pr_flags & PR_IP4)
3284 {
3285 mtx_lock(&pr->pr_mtx);
3286 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
3287 error = EAFNOSUPPORT;
3288 mtx_unlock(&pr->pr_mtx);
3289 }
3290 break;
3291 #endif
3292 #ifdef INET6
3293 case AF_INET6:
3294 if (pr->pr_flags & PR_IP6)
3295 {
3296 mtx_lock(&pr->pr_mtx);
3297 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
3298 error = EAFNOSUPPORT;
3299 mtx_unlock(&pr->pr_mtx);
3300 }
3301 break;
3302 #endif
3303 case AF_LOCAL:
3304 case AF_ROUTE:
3305 break;
3306 default:
3307 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
3308 error = EAFNOSUPPORT;
3309 }
3310 return (error);
3311 }
3312
3313 /*
3314 * Check if given address belongs to the jail referenced by cred (wrapper to
3315 * prison_check_ip[46]).
3316 *
3317 * Returns 0 if jail doesn't restrict the address family or if address belongs
3318 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
3319 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
3320 */
3321 int
3322 prison_if(struct ucred *cred, struct sockaddr *sa)
3323 {
3324 #ifdef INET
3325 struct sockaddr_in *sai;
3326 #endif
3327 #ifdef INET6
3328 struct sockaddr_in6 *sai6;
3329 #endif
3330 int error;
3331
3332 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3333 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
3334
3335 #ifdef VIMAGE
3336 if (prison_owns_vnet(cred))
3337 return (0);
3338 #endif
3339
3340 error = 0;
3341 switch (sa->sa_family)
3342 {
3343 #ifdef INET
3344 case AF_INET:
3345 sai = (struct sockaddr_in *)sa;
3346 error = prison_check_ip4(cred, &sai->sin_addr);
3347 break;
3348 #endif
3349 #ifdef INET6
3350 case AF_INET6:
3351 sai6 = (struct sockaddr_in6 *)sa;
3352 error = prison_check_ip6(cred, &sai6->sin6_addr);
3353 break;
3354 #endif
3355 default:
3356 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
3357 error = EAFNOSUPPORT;
3358 }
3359 return (error);
3360 }
3361
3362 /*
3363 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
3364 */
3365 int
3366 prison_check(struct ucred *cred1, struct ucred *cred2)
3367 {
3368
3369 return ((cred1->cr_prison == cred2->cr_prison ||
3370 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
3371 }
3372
3373 /*
3374 * Return 1 if p2 is a child of p1, otherwise 0.
3375 */
3376 int
3377 prison_ischild(struct prison *pr1, struct prison *pr2)
3378 {
3379
3380 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
3381 if (pr1 == pr2)
3382 return (1);
3383 return (0);
3384 }
3385
3386 /*
3387 * Return 1 if the passed credential is in a jail, otherwise 0.
3388 */
3389 int
3390 jailed(struct ucred *cred)
3391 {
3392
3393 return (cred->cr_prison != &prison0);
3394 }
3395
3396 /*
3397 * Return 1 if the passed credential is in a jail and that jail does not
3398 * have its own virtual network stack, otherwise 0.
3399 */
3400 int
3401 jailed_without_vnet(struct ucred *cred)
3402 {
3403
3404 if (!jailed(cred))
3405 return (0);
3406 #ifdef VIMAGE
3407 if (prison_owns_vnet(cred))
3408 return (0);
3409 #endif
3410
3411 return (1);
3412 }
3413
3414 /*
3415 * Return the correct hostname (domainname, et al) for the passed credential.
3416 */
3417 void
3418 getcredhostname(struct ucred *cred, char *buf, size_t size)
3419 {
3420 struct prison *pr;
3421
3422 /*
3423 * A NULL credential can be used to shortcut to the physical
3424 * system's hostname.
3425 */
3426 pr = (cred != NULL) ? cred->cr_prison : &prison0;
3427 mtx_lock(&pr->pr_mtx);
3428 strlcpy(buf, pr->pr_hostname, size);
3429 mtx_unlock(&pr->pr_mtx);
3430 }
3431
3432 void
3433 getcreddomainname(struct ucred *cred, char *buf, size_t size)
3434 {
3435
3436 mtx_lock(&cred->cr_prison->pr_mtx);
3437 strlcpy(buf, cred->cr_prison->pr_domainname, size);
3438 mtx_unlock(&cred->cr_prison->pr_mtx);
3439 }
3440
3441 void
3442 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
3443 {
3444
3445 mtx_lock(&cred->cr_prison->pr_mtx);
3446 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
3447 mtx_unlock(&cred->cr_prison->pr_mtx);
3448 }
3449
3450 void
3451 getcredhostid(struct ucred *cred, unsigned long *hostid)
3452 {
3453
3454 mtx_lock(&cred->cr_prison->pr_mtx);
3455 *hostid = cred->cr_prison->pr_hostid;
3456 mtx_unlock(&cred->cr_prison->pr_mtx);
3457 }
3458
3459 #ifdef VIMAGE
3460 /*
3461 * Determine whether the prison represented by cred owns
3462 * its vnet rather than having it inherited.
3463 *
3464 * Returns 1 in case the prison owns the vnet, 0 otherwise.
3465 */
3466 int
3467 prison_owns_vnet(struct ucred *cred)
3468 {
3469
3470 /*
3471 * vnets cannot be added/removed after jail creation,
3472 * so no need to lock here.
3473 */
3474 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
3475 }
3476 #endif
3477
3478 /*
3479 * Determine whether the subject represented by cred can "see"
3480 * status of a mount point.
3481 * Returns: 0 for permitted, ENOENT otherwise.
3482 * XXX: This function should be called cr_canseemount() and should be
3483 * placed in kern_prot.c.
3484 */
3485 int
3486 prison_canseemount(struct ucred *cred, struct mount *mp)
3487 {
3488 struct prison *pr;
3489 struct statfs *sp;
3490 size_t len;
3491
3492 pr = cred->cr_prison;
3493 if (pr->pr_enforce_statfs == 0)
3494 return (0);
3495 if (pr->pr_root->v_mount == mp)
3496 return (0);
3497 if (pr->pr_enforce_statfs == 2)
3498 return (ENOENT);
3499 /*
3500 * If jail's chroot directory is set to "/" we should be able to see
3501 * all mount-points from inside a jail.
3502 * This is ugly check, but this is the only situation when jail's
3503 * directory ends with '/'.
3504 */
3505 if (strcmp(pr->pr_path, "/") == 0)
3506 return (0);
3507 len = strlen(pr->pr_path);
3508 sp = &mp->mnt_stat;
3509 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
3510 return (ENOENT);
3511 /*
3512 * Be sure that we don't have situation where jail's root directory
3513 * is "/some/path" and mount point is "/some/pathpath".
3514 */
3515 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
3516 return (ENOENT);
3517 return (0);
3518 }
3519
3520 void
3521 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
3522 {
3523 char jpath[MAXPATHLEN];
3524 struct prison *pr;
3525 size_t len;
3526
3527 pr = cred->cr_prison;
3528 if (pr->pr_enforce_statfs == 0)
3529 return;
3530 if (prison_canseemount(cred, mp) != 0) {
3531 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3532 strlcpy(sp->f_mntonname, "[restricted]",
3533 sizeof(sp->f_mntonname));
3534 return;
3535 }
3536 if (pr->pr_root->v_mount == mp) {
3537 /*
3538 * Clear current buffer data, so we are sure nothing from
3539 * the valid path left there.
3540 */
3541 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3542 *sp->f_mntonname = '/';
3543 return;
3544 }
3545 /*
3546 * If jail's chroot directory is set to "/" we should be able to see
3547 * all mount-points from inside a jail.
3548 */
3549 if (strcmp(pr->pr_path, "/") == 0)
3550 return;
3551 len = strlen(pr->pr_path);
3552 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
3553 /*
3554 * Clear current buffer data, so we are sure nothing from
3555 * the valid path left there.
3556 */
3557 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3558 if (*jpath == '\0') {
3559 /* Should never happen. */
3560 *sp->f_mntonname = '/';
3561 } else {
3562 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
3563 }
3564 }
3565
3566 /*
3567 * Check with permission for a specific privilege is granted within jail. We
3568 * have a specific list of accepted privileges; the rest are denied.
3569 */
3570 int
3571 prison_priv_check(struct ucred *cred, int priv)
3572 {
3573
3574 if (!jailed(cred))
3575 return (0);
3576
3577 #ifdef VIMAGE
3578 /*
3579 * Privileges specific to prisons with a virtual network stack.
3580 * There might be a duplicate entry here in case the privilege
3581 * is only granted conditionally in the legacy jail case.
3582 */
3583 switch (priv) {
3584 #ifdef notyet
3585 /*
3586 * NFS-specific privileges.
3587 */
3588 case PRIV_NFS_DAEMON:
3589 case PRIV_NFS_LOCKD:
3590 #endif
3591 /*
3592 * Network stack privileges.
3593 */
3594 case PRIV_NET_BRIDGE:
3595 case PRIV_NET_GRE:
3596 case PRIV_NET_BPF:
3597 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
3598 case PRIV_NET_ROUTE:
3599 case PRIV_NET_TAP:
3600 case PRIV_NET_SETIFMTU:
3601 case PRIV_NET_SETIFFLAGS:
3602 case PRIV_NET_SETIFCAP:
3603 case PRIV_NET_SETIFDESCR:
3604 case PRIV_NET_SETIFNAME :
3605 case PRIV_NET_SETIFMETRIC:
3606 case PRIV_NET_SETIFPHYS:
3607 case PRIV_NET_SETIFMAC:
3608 case PRIV_NET_ADDMULTI:
3609 case PRIV_NET_DELMULTI:
3610 case PRIV_NET_HWIOCTL:
3611 case PRIV_NET_SETLLADDR:
3612 case PRIV_NET_ADDIFGROUP:
3613 case PRIV_NET_DELIFGROUP:
3614 case PRIV_NET_IFCREATE:
3615 case PRIV_NET_IFDESTROY:
3616 case PRIV_NET_ADDIFADDR:
3617 case PRIV_NET_DELIFADDR:
3618 case PRIV_NET_LAGG:
3619 case PRIV_NET_GIF:
3620 case PRIV_NET_SETIFVNET:
3621 case PRIV_NET_SETIFFIB:
3622
3623 /*
3624 * 802.11-related privileges.
3625 */
3626 case PRIV_NET80211_GETKEY:
3627 #ifdef notyet
3628 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */
3629 #endif
3630
3631 #ifdef notyet
3632 /*
3633 * AppleTalk privileges.
3634 */
3635 case PRIV_NETATALK_RESERVEDPORT:
3636
3637 /*
3638 * ATM privileges.
3639 */
3640 case PRIV_NETATM_CFG:
3641 case PRIV_NETATM_ADD:
3642 case PRIV_NETATM_DEL:
3643 case PRIV_NETATM_SET:
3644
3645 /*
3646 * Bluetooth privileges.
3647 */
3648 case PRIV_NETBLUETOOTH_RAW:
3649 #endif
3650
3651 /*
3652 * Netgraph and netgraph module privileges.
3653 */
3654 case PRIV_NETGRAPH_CONTROL:
3655 #ifdef notyet
3656 case PRIV_NETGRAPH_TTY:
3657 #endif
3658
3659 /*
3660 * IPv4 and IPv6 privileges.
3661 */
3662 case PRIV_NETINET_IPFW:
3663 case PRIV_NETINET_DIVERT:
3664 case PRIV_NETINET_PF:
3665 case PRIV_NETINET_DUMMYNET:
3666 case PRIV_NETINET_CARP:
3667 case PRIV_NETINET_MROUTE:
3668 case PRIV_NETINET_RAW:
3669 case PRIV_NETINET_ADDRCTRL6:
3670 case PRIV_NETINET_ND6:
3671 case PRIV_NETINET_SCOPE6:
3672 case PRIV_NETINET_ALIFETIME6:
3673 case PRIV_NETINET_IPSEC:
3674 case PRIV_NETINET_BINDANY:
3675
3676 #ifdef notyet
3677 /*
3678 * IPX/SPX privileges.
3679 */
3680 case PRIV_NETIPX_RESERVEDPORT:
3681 case PRIV_NETIPX_RAW:
3682
3683 /*
3684 * NCP privileges.
3685 */
3686 case PRIV_NETNCP:
3687
3688 /*
3689 * SMB privileges.
3690 */
3691 case PRIV_NETSMB:
3692 #endif
3693
3694 /*
3695 * No default: or deny here.
3696 * In case of no permit fall through to next switch().
3697 */
3698 if (cred->cr_prison->pr_flags & PR_VNET)
3699 return (0);
3700 }
3701 #endif /* VIMAGE */
3702
3703 switch (priv) {
3704
3705 /*
3706 * Allow ktrace privileges for root in jail.
3707 */
3708 case PRIV_KTRACE:
3709
3710 #if 0
3711 /*
3712 * Allow jailed processes to configure audit identity and
3713 * submit audit records (login, etc). In the future we may
3714 * want to further refine the relationship between audit and
3715 * jail.
3716 */
3717 case PRIV_AUDIT_GETAUDIT:
3718 case PRIV_AUDIT_SETAUDIT:
3719 case PRIV_AUDIT_SUBMIT:
3720 #endif
3721
3722 /*
3723 * Allow jailed processes to manipulate process UNIX
3724 * credentials in any way they see fit.
3725 */
3726 case PRIV_CRED_SETUID:
3727 case PRIV_CRED_SETEUID:
3728 case PRIV_CRED_SETGID:
3729 case PRIV_CRED_SETEGID:
3730 case PRIV_CRED_SETGROUPS:
3731 case PRIV_CRED_SETREUID:
3732 case PRIV_CRED_SETREGID:
3733 case PRIV_CRED_SETRESUID:
3734 case PRIV_CRED_SETRESGID:
3735
3736 /*
3737 * Jail implements visibility constraints already, so allow
3738 * jailed root to override uid/gid-based constraints.
3739 */
3740 case PRIV_SEEOTHERGIDS:
3741 case PRIV_SEEOTHERUIDS:
3742
3743 /*
3744 * Jail implements inter-process debugging limits already, so
3745 * allow jailed root various debugging privileges.
3746 */
3747 case PRIV_DEBUG_DIFFCRED:
3748 case PRIV_DEBUG_SUGID:
3749 case PRIV_DEBUG_UNPRIV:
3750
3751 /*
3752 * Allow jail to set various resource limits and login
3753 * properties, and for now, exceed process resource limits.
3754 */
3755 case PRIV_PROC_LIMIT:
3756 case PRIV_PROC_SETLOGIN:
3757 case PRIV_PROC_SETRLIMIT:
3758
3759 /*
3760 * System V and POSIX IPC privileges are granted in jail.
3761 */
3762 case PRIV_IPC_READ:
3763 case PRIV_IPC_WRITE:
3764 case PRIV_IPC_ADMIN:
3765 case PRIV_IPC_MSGSIZE:
3766 case PRIV_MQ_ADMIN:
3767
3768 /*
3769 * Jail operations within a jail work on child jails.
3770 */
3771 case PRIV_JAIL_ATTACH:
3772 case PRIV_JAIL_SET:
3773 case PRIV_JAIL_REMOVE:
3774
3775 /*
3776 * Jail implements its own inter-process limits, so allow
3777 * root processes in jail to change scheduling on other
3778 * processes in the same jail. Likewise for signalling.
3779 */
3780 case PRIV_SCHED_DIFFCRED:
3781 case PRIV_SCHED_CPUSET:
3782 case PRIV_SIGNAL_DIFFCRED:
3783 case PRIV_SIGNAL_SUGID:
3784
3785 /*
3786 * Allow jailed processes to write to sysctls marked as jail
3787 * writable.
3788 */
3789 case PRIV_SYSCTL_WRITEJAIL:
3790
3791 /*
3792 * Allow root in jail to manage a variety of quota
3793 * properties. These should likely be conditional on a
3794 * configuration option.
3795 */
3796 case PRIV_VFS_GETQUOTA:
3797 case PRIV_VFS_SETQUOTA:
3798
3799 /*
3800 * Since Jail relies on chroot() to implement file system
3801 * protections, grant many VFS privileges to root in jail.
3802 * Be careful to exclude mount-related and NFS-related
3803 * privileges.
3804 */
3805 case PRIV_VFS_READ:
3806 case PRIV_VFS_WRITE:
3807 case PRIV_VFS_ADMIN:
3808 case PRIV_VFS_EXEC:
3809 case PRIV_VFS_LOOKUP:
3810 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
3811 case PRIV_VFS_CHFLAGS_DEV:
3812 case PRIV_VFS_CHOWN:
3813 case PRIV_VFS_CHROOT:
3814 case PRIV_VFS_RETAINSUGID:
3815 case PRIV_VFS_FCHROOT:
3816 case PRIV_VFS_LINK:
3817 case PRIV_VFS_SETGID:
3818 case PRIV_VFS_STAT:
3819 case PRIV_VFS_STICKYFILE:
3820 return (0);
3821
3822 /*
3823 * Depending on the global setting, allow privilege of
3824 * setting system flags.
3825 */
3826 case PRIV_VFS_SYSFLAGS:
3827 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
3828 return (0);
3829 else
3830 return (EPERM);
3831
3832 /*
3833 * Depending on the global setting, allow privilege of
3834 * mounting/unmounting file systems.
3835 */
3836 case PRIV_VFS_MOUNT:
3837 case PRIV_VFS_UNMOUNT:
3838 case PRIV_VFS_MOUNT_NONUSER:
3839 case PRIV_VFS_MOUNT_OWNER:
3840 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT &&
3841 cred->cr_prison->pr_enforce_statfs < 2)
3842 return (0);
3843 else
3844 return (EPERM);
3845
3846 /*
3847 * Allow jailed root to bind reserved ports and reuse in-use
3848 * ports.
3849 */
3850 case PRIV_NETINET_RESERVEDPORT:
3851 case PRIV_NETINET_REUSEPORT:
3852 return (0);
3853
3854 /*
3855 * Allow jailed root to set certian IPv4/6 (option) headers.
3856 */
3857 case PRIV_NETINET_SETHDROPTS:
3858 return (0);
3859
3860 /*
3861 * Conditionally allow creating raw sockets in jail.
3862 */
3863 case PRIV_NETINET_RAW:
3864 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
3865 return (0);
3866 else
3867 return (EPERM);
3868
3869 /*
3870 * Since jail implements its own visibility limits on netstat
3871 * sysctls, allow getcred. This allows identd to work in
3872 * jail.
3873 */
3874 case PRIV_NETINET_GETCRED:
3875 return (0);
3876
3877 /*
3878 * Allow jailed root to set loginclass.
3879 */
3880 case PRIV_PROC_SETLOGINCLASS:
3881 return (0);
3882
3883 default:
3884 /*
3885 * In all remaining cases, deny the privilege request. This
3886 * includes almost all network privileges, many system
3887 * configuration privileges.
3888 */
3889 return (EPERM);
3890 }
3891 }
3892
3893 /*
3894 * Return the part of pr2's name that is relative to pr1, or the whole name
3895 * if it does not directly follow.
3896 */
3897
3898 char *
3899 prison_name(struct prison *pr1, struct prison *pr2)
3900 {
3901 char *name;
3902
3903 /* Jails see themselves as "" (if they see themselves at all). */
3904 if (pr1 == pr2)
3905 return "";
3906 name = pr2->pr_name;
3907 if (prison_ischild(pr1, pr2)) {
3908 /*
3909 * pr1 isn't locked (and allprison_lock may not be either)
3910 * so its length can't be counted on. But the number of dots
3911 * can be counted on - and counted.
3912 */
3913 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
3914 name = strchr(name, '.') + 1;
3915 }
3916 return (name);
3917 }
3918
3919 /*
3920 * Return the part of pr2's path that is relative to pr1, or the whole path
3921 * if it does not directly follow.
3922 */
3923 static char *
3924 prison_path(struct prison *pr1, struct prison *pr2)
3925 {
3926 char *path1, *path2;
3927 int len1;
3928
3929 path1 = pr1->pr_path;
3930 path2 = pr2->pr_path;
3931 if (!strcmp(path1, "/"))
3932 return (path2);
3933 len1 = strlen(path1);
3934 if (strncmp(path1, path2, len1))
3935 return (path2);
3936 if (path2[len1] == '\0')
3937 return "/";
3938 if (path2[len1] == '/')
3939 return (path2 + len1);
3940 return (path2);
3941 }
3942
3943
3944 /*
3945 * Jail-related sysctls.
3946 */
3947 SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
3948 "Jails");
3949
3950 static int
3951 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
3952 {
3953 struct xprison *xp;
3954 struct prison *pr, *cpr;
3955 #ifdef INET
3956 struct in_addr *ip4 = NULL;
3957 int ip4s = 0;
3958 #endif
3959 #ifdef INET6
3960 struct in6_addr *ip6 = NULL;
3961 int ip6s = 0;
3962 #endif
3963 int descend, error;
3964
3965 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
3966 pr = req->td->td_ucred->cr_prison;
3967 error = 0;
3968 sx_slock(&allprison_lock);
3969 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
3970 #if defined(INET) || defined(INET6)
3971 again:
3972 #endif
3973 mtx_lock(&cpr->pr_mtx);
3974 #ifdef INET
3975 if (cpr->pr_ip4s > 0) {
3976 if (ip4s < cpr->pr_ip4s) {
3977 ip4s = cpr->pr_ip4s;
3978 mtx_unlock(&cpr->pr_mtx);
3979 ip4 = realloc(ip4, ip4s *
3980 sizeof(struct in_addr), M_TEMP, M_WAITOK);
3981 goto again;
3982 }
3983 bcopy(cpr->pr_ip4, ip4,
3984 cpr->pr_ip4s * sizeof(struct in_addr));
3985 }
3986 #endif
3987 #ifdef INET6
3988 if (cpr->pr_ip6s > 0) {
3989 if (ip6s < cpr->pr_ip6s) {
3990 ip6s = cpr->pr_ip6s;
3991 mtx_unlock(&cpr->pr_mtx);
3992 ip6 = realloc(ip6, ip6s *
3993 sizeof(struct in6_addr), M_TEMP, M_WAITOK);
3994 goto again;
3995 }
3996 bcopy(cpr->pr_ip6, ip6,
3997 cpr->pr_ip6s * sizeof(struct in6_addr));
3998 }
3999 #endif
4000 if (cpr->pr_ref == 0) {
4001 mtx_unlock(&cpr->pr_mtx);
4002 continue;
4003 }
4004 bzero(xp, sizeof(*xp));
4005 xp->pr_version = XPRISON_VERSION;
4006 xp->pr_id = cpr->pr_id;
4007 xp->pr_state = cpr->pr_uref > 0
4008 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
4009 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
4010 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
4011 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
4012 #ifdef INET
4013 xp->pr_ip4s = cpr->pr_ip4s;
4014 #endif
4015 #ifdef INET6
4016 xp->pr_ip6s = cpr->pr_ip6s;
4017 #endif
4018 mtx_unlock(&cpr->pr_mtx);
4019 error = SYSCTL_OUT(req, xp, sizeof(*xp));
4020 if (error)
4021 break;
4022 #ifdef INET
4023 if (xp->pr_ip4s > 0) {
4024 error = SYSCTL_OUT(req, ip4,
4025 xp->pr_ip4s * sizeof(struct in_addr));
4026 if (error)
4027 break;
4028 }
4029 #endif
4030 #ifdef INET6
4031 if (xp->pr_ip6s > 0) {
4032 error = SYSCTL_OUT(req, ip6,
4033 xp->pr_ip6s * sizeof(struct in6_addr));
4034 if (error)
4035 break;
4036 }
4037 #endif
4038 }
4039 sx_sunlock(&allprison_lock);
4040 free(xp, M_TEMP);
4041 #ifdef INET
4042 free(ip4, M_TEMP);
4043 #endif
4044 #ifdef INET6
4045 free(ip6, M_TEMP);
4046 #endif
4047 return (error);
4048 }
4049
4050 SYSCTL_OID(_security_jail, OID_AUTO, list,
4051 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4052 sysctl_jail_list, "S", "List of active jails");
4053
4054 static int
4055 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
4056 {
4057 int error, injail;
4058
4059 injail = jailed(req->td->td_ucred);
4060 error = SYSCTL_OUT(req, &injail, sizeof(injail));
4061
4062 return (error);
4063 }
4064
4065 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
4066 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4067 sysctl_jail_jailed, "I", "Process in jail?");
4068
4069 #if defined(INET) || defined(INET6)
4070 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
4071 &jail_max_af_ips, 0,
4072 "Number of IP addresses a jail may have at most per address family");
4073 #endif
4074
4075 /*
4076 * Default parameters for jail(2) compatability. For historical reasons,
4077 * the sysctl names have varying similarity to the parameter names. Prisons
4078 * just see their own parameters, and can't change them.
4079 */
4080 static int
4081 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
4082 {
4083 struct prison *pr;
4084 int allow, error, i;
4085
4086 pr = req->td->td_ucred->cr_prison;
4087 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
4088
4089 /* Get the current flag value, and convert it to a boolean. */
4090 i = (allow & arg2) ? 1 : 0;
4091 if (arg1 != NULL)
4092 i = !i;
4093 error = sysctl_handle_int(oidp, &i, 0, req);
4094 if (error || !req->newptr)
4095 return (error);
4096 i = i ? arg2 : 0;
4097 if (arg1 != NULL)
4098 i ^= arg2;
4099 /*
4100 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
4101 * for writing.
4102 */
4103 mtx_lock(&prison0.pr_mtx);
4104 jail_default_allow = (jail_default_allow & ~arg2) | i;
4105 mtx_unlock(&prison0.pr_mtx);
4106 return (0);
4107 }
4108
4109 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
4110 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4111 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
4112 "Processes in jail can set their hostnames");
4113 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
4114 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4115 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
4116 "Processes in jail are limited to creating UNIX/IP/route sockets only");
4117 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
4118 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4119 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
4120 "Processes in jail can use System V IPC primitives");
4121 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
4122 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4123 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
4124 "Prison root can create raw sockets");
4125 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
4126 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4127 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
4128 "Processes in jail can alter system file flags");
4129 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
4130 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4131 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
4132 "Processes in jail can mount/unmount jail-friendly file systems");
4133
4134 static int
4135 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
4136 {
4137 struct prison *pr;
4138 int level, error;
4139
4140 pr = req->td->td_ucred->cr_prison;
4141 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
4142 error = sysctl_handle_int(oidp, &level, 0, req);
4143 if (error || !req->newptr)
4144 return (error);
4145 *(int *)arg1 = level;
4146 return (0);
4147 }
4148
4149 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
4150 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4151 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
4152 sysctl_jail_default_level, "I",
4153 "Processes in jail cannot see all mounted file systems");
4154
4155 /*
4156 * Nodes to describe jail parameters. Maximum length of string parameters
4157 * is returned in the string itself, and the other parameters exist merely
4158 * to make themselves and their types known.
4159 */
4160 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0,
4161 "Jail parameters");
4162
4163 int
4164 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
4165 {
4166 int i;
4167 long l;
4168 size_t s;
4169 char numbuf[12];
4170
4171 switch (oidp->oid_kind & CTLTYPE)
4172 {
4173 case CTLTYPE_LONG:
4174 case CTLTYPE_ULONG:
4175 l = 0;
4176 #ifdef SCTL_MASK32
4177 if (!(req->flags & SCTL_MASK32))
4178 #endif
4179 return (SYSCTL_OUT(req, &l, sizeof(l)));
4180 case CTLTYPE_INT:
4181 case CTLTYPE_UINT:
4182 i = 0;
4183 return (SYSCTL_OUT(req, &i, sizeof(i)));
4184 case CTLTYPE_STRING:
4185 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
4186 return
4187 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
4188 case CTLTYPE_STRUCT:
4189 s = (size_t)arg2;
4190 return (SYSCTL_OUT(req, &s, sizeof(s)));
4191 }
4192 return (0);
4193 }
4194
4195 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
4196 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
4197 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
4198 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
4199 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
4200 "I", "Jail secure level");
4201 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
4202 "I", "Jail cannot see all mounted file systems");
4203 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
4204 "B", "Jail persistence");
4205 #ifdef VIMAGE
4206 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
4207 "E,jailsys", "Virtual network stack");
4208 #endif
4209 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
4210 "B", "Jail is in the process of shutting down");
4211
4212 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
4213 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
4214 "I", "Current number of child jails");
4215 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
4216 "I", "Maximum number of child jails");
4217
4218 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
4219 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
4220 "Jail hostname");
4221 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
4222 "Jail NIS domainname");
4223 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
4224 "Jail host UUID");
4225 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
4226 "LU", "Jail host ID");
4227
4228 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
4229 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
4230
4231 #ifdef INET
4232 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
4233 "Jail IPv4 address virtualization");
4234 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
4235 "S,in_addr,a", "Jail IPv4 addresses");
4236 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4237 "B", "Do (not) use IPv4 source address selection rather than the "
4238 "primary jail IPv4 address.");
4239 #endif
4240 #ifdef INET6
4241 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
4242 "Jail IPv6 address virtualization");
4243 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
4244 "S,in6_addr,a", "Jail IPv6 addresses");
4245 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4246 "B", "Do (not) use IPv6 source address selection rather than the "
4247 "primary jail IPv6 address.");
4248 #endif
4249
4250 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
4251 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
4252 "B", "Jail may set hostname");
4253 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
4254 "B", "Jail may use SYSV IPC");
4255 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
4256 "B", "Jail may create raw sockets");
4257 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
4258 "B", "Jail may alter system file flags");
4259 SYSCTL_JAIL_PARAM(_allow, mount, CTLTYPE_INT | CTLFLAG_RW,
4260 "B", "Jail may mount/unmount jail-friendly file systems");
4261 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
4262 "B", "Jail may set file quotas");
4263 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
4264 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
4265
4266 void
4267 prison_racct_foreach(void (*callback)(struct racct *racct,
4268 void *arg2, void *arg3), void *arg2, void *arg3)
4269 {
4270 struct prison_racct *prr;
4271
4272 sx_slock(&allprison_lock);
4273 LIST_FOREACH(prr, &allprison_racct, prr_next)
4274 (callback)(prr->prr_racct, arg2, arg3);
4275 sx_sunlock(&allprison_lock);
4276 }
4277
4278 static struct prison_racct *
4279 prison_racct_find_locked(const char *name)
4280 {
4281 struct prison_racct *prr;
4282
4283 sx_assert(&allprison_lock, SA_XLOCKED);
4284
4285 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
4286 return (NULL);
4287
4288 LIST_FOREACH(prr, &allprison_racct, prr_next) {
4289 if (strcmp(name, prr->prr_name) != 0)
4290 continue;
4291
4292 /* Found prison_racct with a matching name? */
4293 prison_racct_hold(prr);
4294 return (prr);
4295 }
4296
4297 /* Add new prison_racct. */
4298 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
4299 racct_create(&prr->prr_racct);
4300
4301 strcpy(prr->prr_name, name);
4302 refcount_init(&prr->prr_refcount, 1);
4303 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
4304
4305 return (prr);
4306 }
4307
4308 struct prison_racct *
4309 prison_racct_find(const char *name)
4310 {
4311 struct prison_racct *prr;
4312
4313 sx_xlock(&allprison_lock);
4314 prr = prison_racct_find_locked(name);
4315 sx_xunlock(&allprison_lock);
4316 return (prr);
4317 }
4318
4319 void
4320 prison_racct_hold(struct prison_racct *prr)
4321 {
4322
4323 refcount_acquire(&prr->prr_refcount);
4324 }
4325
4326 void
4327 prison_racct_free(struct prison_racct *prr)
4328 {
4329 int old;
4330
4331 old = prr->prr_refcount;
4332 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1))
4333 return;
4334
4335 sx_xlock(&allprison_lock);
4336 if (refcount_release(&prr->prr_refcount)) {
4337 racct_destroy(&prr->prr_racct);
4338 LIST_REMOVE(prr, prr_next);
4339 sx_xunlock(&allprison_lock);
4340 free(prr, M_PRISON_RACCT);
4341
4342 return;
4343 }
4344 sx_xunlock(&allprison_lock);
4345 }
4346
4347 #ifdef RACCT
4348 static void
4349 prison_racct_attach(struct prison *pr)
4350 {
4351 struct prison_racct *prr;
4352
4353 prr = prison_racct_find_locked(pr->pr_name);
4354 KASSERT(prr != NULL, ("cannot find prison_racct"));
4355
4356 pr->pr_prison_racct = prr;
4357 }
4358
4359 static void
4360 prison_racct_detach(struct prison *pr)
4361 {
4362 prison_racct_free(pr->pr_prison_racct);
4363 pr->pr_prison_racct = NULL;
4364 }
4365 #endif /* RACCT */
4366
4367 #ifdef DDB
4368
4369 static void
4370 db_show_prison(struct prison *pr)
4371 {
4372 int fi;
4373 #if defined(INET) || defined(INET6)
4374 int ii;
4375 #endif
4376 unsigned jsf;
4377 #ifdef INET6
4378 char ip6buf[INET6_ADDRSTRLEN];
4379 #endif
4380
4381 db_printf("prison %p:\n", pr);
4382 db_printf(" jid = %d\n", pr->pr_id);
4383 db_printf(" name = %s\n", pr->pr_name);
4384 db_printf(" parent = %p\n", pr->pr_parent);
4385 db_printf(" ref = %d\n", pr->pr_ref);
4386 db_printf(" uref = %d\n", pr->pr_uref);
4387 db_printf(" path = %s\n", pr->pr_path);
4388 db_printf(" cpuset = %d\n", pr->pr_cpuset
4389 ? pr->pr_cpuset->cs_id : -1);
4390 #ifdef VIMAGE
4391 db_printf(" vnet = %p\n", pr->pr_vnet);
4392 #endif
4393 db_printf(" root = %p\n", pr->pr_root);
4394 db_printf(" securelevel = %d\n", pr->pr_securelevel);
4395 db_printf(" children.max = %d\n", pr->pr_childmax);
4396 db_printf(" children.cur = %d\n", pr->pr_childcount);
4397 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
4398 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
4399 db_printf(" flags = 0x%x", pr->pr_flags);
4400 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
4401 fi++)
4402 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi)))
4403 db_printf(" %s", pr_flag_names[fi]);
4404 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
4405 fi++) {
4406 jsf = pr->pr_flags &
4407 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
4408 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name,
4409 pr_flag_jailsys[fi].disable &&
4410 (jsf == pr_flag_jailsys[fi].disable) ? "disable"
4411 : (jsf == pr_flag_jailsys[fi].new) ? "new"
4412 : "inherit");
4413 }
4414 db_printf(" allow = 0x%x", pr->pr_allow);
4415 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
4416 fi++)
4417 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi)))
4418 db_printf(" %s", pr_allow_names[fi]);
4419 db_printf("\n");
4420 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
4421 db_printf(" host.hostname = %s\n", pr->pr_hostname);
4422 db_printf(" host.domainname = %s\n", pr->pr_domainname);
4423 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
4424 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
4425 #ifdef INET
4426 db_printf(" ip4s = %d\n", pr->pr_ip4s);
4427 for (ii = 0; ii < pr->pr_ip4s; ii++)
4428 db_printf(" %s %s\n",
4429 ii == 0 ? "ip4.addr =" : " ",
4430 inet_ntoa(pr->pr_ip4[ii]));
4431 #endif
4432 #ifdef INET6
4433 db_printf(" ip6s = %d\n", pr->pr_ip6s);
4434 for (ii = 0; ii < pr->pr_ip6s; ii++)
4435 db_printf(" %s %s\n",
4436 ii == 0 ? "ip6.addr =" : " ",
4437 ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
4438 #endif
4439 }
4440
4441 DB_SHOW_COMMAND(prison, db_show_prison_command)
4442 {
4443 struct prison *pr;
4444
4445 if (!have_addr) {
4446 /*
4447 * Show all prisons in the list, and prison0 which is not
4448 * listed.
4449 */
4450 db_show_prison(&prison0);
4451 if (!db_pager_quit) {
4452 TAILQ_FOREACH(pr, &allprison, pr_list) {
4453 db_show_prison(pr);
4454 if (db_pager_quit)
4455 break;
4456 }
4457 }
4458 return;
4459 }
4460
4461 if (addr == 0)
4462 pr = &prison0;
4463 else {
4464 /* Look for a prison with the ID and with references. */
4465 TAILQ_FOREACH(pr, &allprison, pr_list)
4466 if (pr->pr_id == addr && pr->pr_ref > 0)
4467 break;
4468 if (pr == NULL)
4469 /* Look again, without requiring a reference. */
4470 TAILQ_FOREACH(pr, &allprison, pr_list)
4471 if (pr->pr_id == addr)
4472 break;
4473 if (pr == NULL)
4474 /* Assume address points to a valid prison. */
4475 pr = (struct prison *)addr;
4476 }
4477 db_show_prison(pr);
4478 }
4479
4480 #endif /* DDB */
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