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/8.4/sys/kern/kern_jail.c 242464 2012-11-02 01:32:22Z jamie $");
31
32 #include "opt_compat.h"
33 #include "opt_ddb.h"
34 #include "opt_inet.h"
35 #include "opt_inet6.h"
36
37 #include <sys/param.h>
38 #include <sys/types.h>
39 #include <sys/kernel.h>
40 #include <sys/systm.h>
41 #include <sys/errno.h>
42 #include <sys/sysproto.h>
43 #include <sys/malloc.h>
44 #include <sys/osd.h>
45 #include <sys/priv.h>
46 #include <sys/proc.h>
47 #include <sys/taskqueue.h>
48 #include <sys/fcntl.h>
49 #include <sys/jail.h>
50 #include <sys/lock.h>
51 #include <sys/mutex.h>
52 #include <sys/sx.h>
53 #include <sys/sysent.h>
54 #include <sys/namei.h>
55 #include <sys/mount.h>
56 #include <sys/queue.h>
57 #include <sys/socket.h>
58 #include <sys/syscallsubr.h>
59 #include <sys/sysctl.h>
60 #include <sys/vnode.h>
61
62 #include <net/if.h>
63 #include <net/vnet.h>
64
65 #include <netinet/in.h>
66
67 #ifdef DDB
68 #include <ddb/ddb.h>
69 #ifdef INET6
70 #include <netinet6/in6_var.h>
71 #endif /* INET6 */
72 #endif /* DDB */
73
74 #include <security/mac/mac_framework.h>
75
76 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000"
77
78 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
79
80 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */
81 #ifdef INET
82 #ifdef INET6
83 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
84 #else
85 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
86 #endif
87 #else /* !INET */
88 #ifdef INET6
89 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
90 #else
91 #define _PR_IP_SADDRSEL 0
92 #endif
93 #endif
94
95 /* prison0 describes what is "real" about the system. */
96 struct prison prison0 = {
97 .pr_id = 0,
98 .pr_name = "",
99 .pr_ref = 1,
100 .pr_uref = 1,
101 .pr_path = "/",
102 .pr_securelevel = -1,
103 .pr_childmax = JAIL_MAX,
104 .pr_hostuuid = DEFAULT_HOSTUUID,
105 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
106 #ifdef VIMAGE
107 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
108 #else
109 .pr_flags = PR_HOST|_PR_IP_SADDRSEL,
110 #endif
111 .pr_allow = PR_ALLOW_ALL,
112 };
113 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
114
115 /* allprison and lastprid are protected by allprison_lock. */
116 struct sx allprison_lock;
117 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
118 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
119 int lastprid = 0;
120
121 static int do_jail_attach(struct thread *td, struct prison *pr);
122 static void prison_complete(void *context, int pending);
123 static void prison_deref(struct prison *pr, int flags);
124 static char *prison_path(struct prison *pr1, struct prison *pr2);
125 static void prison_remove_one(struct prison *pr);
126 #ifdef INET
127 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia);
128 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4);
129 #endif
130 #ifdef INET6
131 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6);
132 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6);
133 #endif
134
135 /* Flags for prison_deref */
136 #define PD_DEREF 0x01
137 #define PD_DEUREF 0x02
138 #define PD_LOCKED 0x04
139 #define PD_LIST_SLOCKED 0x08
140 #define PD_LIST_XLOCKED 0x10
141
142 /*
143 * Parameter names corresponding to PR_* flag values. Size values are for kvm
144 * as we cannot figure out the size of a sparse array, or an array without a
145 * terminating entry.
146 */
147 static char *pr_flag_names[] = {
148 [0] = "persist",
149 #ifdef INET
150 [7] = "ip4.saddrsel",
151 #endif
152 #ifdef INET6
153 [8] = "ip6.saddrsel",
154 #endif
155 };
156 const size_t pr_flag_names_size = sizeof(pr_flag_names);
157
158 static char *pr_flag_nonames[] = {
159 [0] = "nopersist",
160 #ifdef INET
161 [7] = "ip4.nosaddrsel",
162 #endif
163 #ifdef INET6
164 [8] = "ip6.nosaddrsel",
165 #endif
166 };
167 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames);
168
169 struct jailsys_flags {
170 const char *name;
171 unsigned disable;
172 unsigned new;
173 } pr_flag_jailsys[] = {
174 { "host", 0, PR_HOST },
175 #ifdef VIMAGE
176 { "vnet", 0, PR_VNET },
177 #endif
178 #ifdef INET
179 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER },
180 #endif
181 #ifdef INET6
182 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER },
183 #endif
184 };
185 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
186
187 static char *pr_allow_names[] = {
188 "allow.set_hostname",
189 "allow.sysvipc",
190 "allow.raw_sockets",
191 "allow.chflags",
192 "allow.mount",
193 "allow.quotas",
194 "allow.socket_af",
195 };
196 const size_t pr_allow_names_size = sizeof(pr_allow_names);
197
198 static char *pr_allow_nonames[] = {
199 "allow.noset_hostname",
200 "allow.nosysvipc",
201 "allow.noraw_sockets",
202 "allow.nochflags",
203 "allow.nomount",
204 "allow.noquotas",
205 "allow.nosocket_af",
206 };
207 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames);
208
209 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME
210 #define JAIL_DEFAULT_ENFORCE_STATFS 2
211 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
212 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
213 #if defined(INET) || defined(INET6)
214 static unsigned jail_max_af_ips = 255;
215 #endif
216
217 #ifdef INET
218 static int
219 qcmp_v4(const void *ip1, const void *ip2)
220 {
221 in_addr_t iaa, iab;
222
223 /*
224 * We need to compare in HBO here to get the list sorted as expected
225 * by the result of the code. Sorting NBO addresses gives you
226 * interesting results. If you do not understand, do not try.
227 */
228 iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
229 iab = ntohl(((const struct in_addr *)ip2)->s_addr);
230
231 /*
232 * Do not simply return the difference of the two numbers, the int is
233 * not wide enough.
234 */
235 if (iaa > iab)
236 return (1);
237 else if (iaa < iab)
238 return (-1);
239 else
240 return (0);
241 }
242 #endif
243
244 #ifdef INET6
245 static int
246 qcmp_v6(const void *ip1, const void *ip2)
247 {
248 const struct in6_addr *ia6a, *ia6b;
249 int i, rc;
250
251 ia6a = (const struct in6_addr *)ip1;
252 ia6b = (const struct in6_addr *)ip2;
253
254 rc = 0;
255 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
256 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
257 rc = 1;
258 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
259 rc = -1;
260 }
261 return (rc);
262 }
263 #endif
264
265 /*
266 * struct jail_args {
267 * struct jail *jail;
268 * };
269 */
270 int
271 jail(struct thread *td, struct jail_args *uap)
272 {
273 uint32_t version;
274 int error;
275 struct jail j;
276
277 error = copyin(uap->jail, &version, sizeof(uint32_t));
278 if (error)
279 return (error);
280
281 switch (version) {
282 case 0:
283 {
284 struct jail_v0 j0;
285
286 /* FreeBSD single IPv4 jails. */
287 bzero(&j, sizeof(struct jail));
288 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
289 if (error)
290 return (error);
291 j.version = j0.version;
292 j.path = j0.path;
293 j.hostname = j0.hostname;
294 j.ip4s = j0.ip_number;
295 break;
296 }
297
298 case 1:
299 /*
300 * Version 1 was used by multi-IPv4 jail implementations
301 * that never made it into the official kernel.
302 */
303 return (EINVAL);
304
305 case 2: /* JAIL_API_VERSION */
306 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
307 error = copyin(uap->jail, &j, sizeof(struct jail));
308 if (error)
309 return (error);
310 break;
311
312 default:
313 /* Sci-Fi jails are not supported, sorry. */
314 return (EINVAL);
315 }
316 return (kern_jail(td, &j));
317 }
318
319 int
320 kern_jail(struct thread *td, struct jail *j)
321 {
322 struct iovec optiov[2 * (4
323 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0])
324 #ifdef INET
325 + 1
326 #endif
327 #ifdef INET6
328 + 1
329 #endif
330 )];
331 struct uio opt;
332 char *u_path, *u_hostname, *u_name;
333 #ifdef INET
334 uint32_t ip4s;
335 struct in_addr *u_ip4;
336 #endif
337 #ifdef INET6
338 struct in6_addr *u_ip6;
339 #endif
340 size_t tmplen;
341 int error, enforce_statfs, fi;
342
343 bzero(&optiov, sizeof(optiov));
344 opt.uio_iov = optiov;
345 opt.uio_iovcnt = 0;
346 opt.uio_offset = -1;
347 opt.uio_resid = -1;
348 opt.uio_segflg = UIO_SYSSPACE;
349 opt.uio_rw = UIO_READ;
350 opt.uio_td = td;
351
352 /* Set permissions for top-level jails from sysctls. */
353 if (!jailed(td->td_ucred)) {
354 for (fi = 0; fi < sizeof(pr_allow_names) /
355 sizeof(pr_allow_names[0]); fi++) {
356 optiov[opt.uio_iovcnt].iov_base =
357 (jail_default_allow & (1 << fi))
358 ? pr_allow_names[fi] : pr_allow_nonames[fi];
359 optiov[opt.uio_iovcnt].iov_len =
360 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
361 opt.uio_iovcnt += 2;
362 }
363 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
364 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
365 opt.uio_iovcnt++;
366 enforce_statfs = jail_default_enforce_statfs;
367 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
368 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
369 opt.uio_iovcnt++;
370 }
371
372 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
373 #ifdef INET
374 ip4s = (j->version == 0) ? 1 : j->ip4s;
375 if (ip4s > jail_max_af_ips)
376 return (EINVAL);
377 tmplen += ip4s * sizeof(struct in_addr);
378 #else
379 if (j->ip4s > 0)
380 return (EINVAL);
381 #endif
382 #ifdef INET6
383 if (j->ip6s > jail_max_af_ips)
384 return (EINVAL);
385 tmplen += j->ip6s * sizeof(struct in6_addr);
386 #else
387 if (j->ip6s > 0)
388 return (EINVAL);
389 #endif
390 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
391 u_hostname = u_path + MAXPATHLEN;
392 u_name = u_hostname + MAXHOSTNAMELEN;
393 #ifdef INET
394 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
395 #endif
396 #ifdef INET6
397 #ifdef INET
398 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
399 #else
400 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
401 #endif
402 #endif
403 optiov[opt.uio_iovcnt].iov_base = "path";
404 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
405 opt.uio_iovcnt++;
406 optiov[opt.uio_iovcnt].iov_base = u_path;
407 error = copyinstr(j->path, u_path, MAXPATHLEN,
408 &optiov[opt.uio_iovcnt].iov_len);
409 if (error) {
410 free(u_path, M_TEMP);
411 return (error);
412 }
413 opt.uio_iovcnt++;
414 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
415 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
416 opt.uio_iovcnt++;
417 optiov[opt.uio_iovcnt].iov_base = u_hostname;
418 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
419 &optiov[opt.uio_iovcnt].iov_len);
420 if (error) {
421 free(u_path, M_TEMP);
422 return (error);
423 }
424 opt.uio_iovcnt++;
425 if (j->jailname != NULL) {
426 optiov[opt.uio_iovcnt].iov_base = "name";
427 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
428 opt.uio_iovcnt++;
429 optiov[opt.uio_iovcnt].iov_base = u_name;
430 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
431 &optiov[opt.uio_iovcnt].iov_len);
432 if (error) {
433 free(u_path, M_TEMP);
434 return (error);
435 }
436 opt.uio_iovcnt++;
437 }
438 #ifdef INET
439 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
440 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
441 opt.uio_iovcnt++;
442 optiov[opt.uio_iovcnt].iov_base = u_ip4;
443 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
444 if (j->version == 0)
445 u_ip4->s_addr = j->ip4s;
446 else {
447 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
448 if (error) {
449 free(u_path, M_TEMP);
450 return (error);
451 }
452 }
453 opt.uio_iovcnt++;
454 #endif
455 #ifdef INET6
456 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
457 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
458 opt.uio_iovcnt++;
459 optiov[opt.uio_iovcnt].iov_base = u_ip6;
460 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
461 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
462 if (error) {
463 free(u_path, M_TEMP);
464 return (error);
465 }
466 opt.uio_iovcnt++;
467 #endif
468 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]),
469 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
470 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
471 free(u_path, M_TEMP);
472 return (error);
473 }
474
475
476 /*
477 * struct jail_set_args {
478 * struct iovec *iovp;
479 * unsigned int iovcnt;
480 * int flags;
481 * };
482 */
483 int
484 jail_set(struct thread *td, struct jail_set_args *uap)
485 {
486 struct uio *auio;
487 int error;
488
489 /* Check that we have an even number of iovecs. */
490 if (uap->iovcnt & 1)
491 return (EINVAL);
492
493 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
494 if (error)
495 return (error);
496 error = kern_jail_set(td, auio, uap->flags);
497 free(auio, M_IOV);
498 return (error);
499 }
500
501 int
502 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
503 {
504 struct nameidata nd;
505 #ifdef INET
506 struct in_addr *ip4;
507 #endif
508 #ifdef INET6
509 struct in6_addr *ip6;
510 #endif
511 struct vfsopt *opt;
512 struct vfsoptlist *opts;
513 struct prison *pr, *deadpr, *mypr, *ppr, *tpr;
514 struct vnode *root;
515 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
516 #if defined(INET) || defined(INET6)
517 struct prison *tppr;
518 void *op;
519 #endif
520 unsigned long hid;
521 size_t namelen, onamelen;
522 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos;
523 int gotchildmax, gotenforce, gothid, gotslevel;
524 int fi, jid, jsys, len, level;
525 int childmax, slevel, vfslocked;
526 #if defined(INET) || defined(INET6)
527 int ii, ij;
528 #endif
529 #ifdef INET
530 int ip4s, redo_ip4;
531 #endif
532 #ifdef INET6
533 int ip6s, redo_ip6;
534 #endif
535 unsigned pr_flags, ch_flags;
536 unsigned pr_allow, ch_allow, tallow;
537 char numbuf[12];
538
539 error = priv_check(td, PRIV_JAIL_SET);
540 if (!error && (flags & JAIL_ATTACH))
541 error = priv_check(td, PRIV_JAIL_ATTACH);
542 if (error)
543 return (error);
544 mypr = ppr = td->td_ucred->cr_prison;
545 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
546 return (EPERM);
547 if (flags & ~JAIL_SET_MASK)
548 return (EINVAL);
549
550 /*
551 * Check all the parameters before committing to anything. Not all
552 * errors can be caught early, but we may as well try. Also, this
553 * takes care of some expensive stuff (path lookup) before getting
554 * the allprison lock.
555 *
556 * XXX Jails are not filesystems, and jail parameters are not mount
557 * options. But it makes more sense to re-use the vfsopt code
558 * than duplicate it under a different name.
559 */
560 error = vfs_buildopts(optuio, &opts);
561 if (error)
562 return (error);
563 #ifdef INET
564 ip4 = NULL;
565 #endif
566 #ifdef INET6
567 ip6 = NULL;
568 #endif
569
570 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
571 if (error == ENOENT)
572 jid = 0;
573 else if (error != 0)
574 goto done_free;
575
576 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
577 if (error == ENOENT)
578 gotslevel = 0;
579 else if (error != 0)
580 goto done_free;
581 else
582 gotslevel = 1;
583
584 error =
585 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
586 if (error == ENOENT)
587 gotchildmax = 0;
588 else if (error != 0)
589 goto done_free;
590 else
591 gotchildmax = 1;
592
593 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
594 if (error == ENOENT)
595 gotenforce = 0;
596 else if (error != 0)
597 goto done_free;
598 else if (enforce < 0 || enforce > 2) {
599 error = EINVAL;
600 goto done_free;
601 } else
602 gotenforce = 1;
603
604 pr_flags = ch_flags = 0;
605 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
606 fi++) {
607 if (pr_flag_names[fi] == NULL)
608 continue;
609 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi);
610 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi);
611 }
612 ch_flags |= pr_flags;
613 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
614 fi++) {
615 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys,
616 sizeof(jsys));
617 if (error == ENOENT)
618 continue;
619 if (error != 0)
620 goto done_free;
621 switch (jsys) {
622 case JAIL_SYS_DISABLE:
623 if (!pr_flag_jailsys[fi].disable) {
624 error = EINVAL;
625 goto done_free;
626 }
627 pr_flags |= pr_flag_jailsys[fi].disable;
628 break;
629 case JAIL_SYS_NEW:
630 pr_flags |= pr_flag_jailsys[fi].new;
631 break;
632 case JAIL_SYS_INHERIT:
633 break;
634 default:
635 error = EINVAL;
636 goto done_free;
637 }
638 ch_flags |=
639 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable;
640 }
641 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE
642 && !(pr_flags & PR_PERSIST)) {
643 error = EINVAL;
644 vfs_opterror(opts, "new jail must persist or attach");
645 goto done_errmsg;
646 }
647 #ifdef VIMAGE
648 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
649 error = EINVAL;
650 vfs_opterror(opts, "vnet cannot be changed after creation");
651 goto done_errmsg;
652 }
653 #endif
654 #ifdef INET
655 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
656 error = EINVAL;
657 vfs_opterror(opts, "ip4 cannot be changed after creation");
658 goto done_errmsg;
659 }
660 #endif
661 #ifdef INET6
662 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
663 error = EINVAL;
664 vfs_opterror(opts, "ip6 cannot be changed after creation");
665 goto done_errmsg;
666 }
667 #endif
668
669 pr_allow = ch_allow = 0;
670 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
671 fi++) {
672 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi);
673 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi);
674 }
675 ch_allow |= pr_allow;
676
677 error = vfs_getopt(opts, "name", (void **)&name, &len);
678 if (error == ENOENT)
679 name = NULL;
680 else if (error != 0)
681 goto done_free;
682 else {
683 if (len == 0 || name[len - 1] != '\0') {
684 error = EINVAL;
685 goto done_free;
686 }
687 if (len > MAXHOSTNAMELEN) {
688 error = ENAMETOOLONG;
689 goto done_free;
690 }
691 }
692
693 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
694 if (error == ENOENT)
695 host = NULL;
696 else if (error != 0)
697 goto done_free;
698 else {
699 ch_flags |= PR_HOST;
700 pr_flags |= PR_HOST;
701 if (len == 0 || host[len - 1] != '\0') {
702 error = EINVAL;
703 goto done_free;
704 }
705 if (len > MAXHOSTNAMELEN) {
706 error = ENAMETOOLONG;
707 goto done_free;
708 }
709 }
710
711 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
712 if (error == ENOENT)
713 domain = NULL;
714 else if (error != 0)
715 goto done_free;
716 else {
717 ch_flags |= PR_HOST;
718 pr_flags |= PR_HOST;
719 if (len == 0 || domain[len - 1] != '\0') {
720 error = EINVAL;
721 goto done_free;
722 }
723 if (len > MAXHOSTNAMELEN) {
724 error = ENAMETOOLONG;
725 goto done_free;
726 }
727 }
728
729 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
730 if (error == ENOENT)
731 uuid = NULL;
732 else if (error != 0)
733 goto done_free;
734 else {
735 ch_flags |= PR_HOST;
736 pr_flags |= PR_HOST;
737 if (len == 0 || uuid[len - 1] != '\0') {
738 error = EINVAL;
739 goto done_free;
740 }
741 if (len > HOSTUUIDLEN) {
742 error = ENAMETOOLONG;
743 goto done_free;
744 }
745 }
746
747 #ifdef COMPAT_FREEBSD32
748 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
749 uint32_t hid32;
750
751 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
752 hid = hid32;
753 } else
754 #endif
755 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
756 if (error == ENOENT)
757 gothid = 0;
758 else if (error != 0)
759 goto done_free;
760 else {
761 gothid = 1;
762 ch_flags |= PR_HOST;
763 pr_flags |= PR_HOST;
764 }
765
766 #ifdef INET
767 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
768 if (error == ENOENT)
769 ip4s = (pr_flags & PR_IP4_DISABLE) ? 0 : -1;
770 else if (error != 0)
771 goto done_free;
772 else if (ip4s & (sizeof(*ip4) - 1)) {
773 error = EINVAL;
774 goto done_free;
775 } else {
776 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE;
777 if (ip4s == 0)
778 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE;
779 else {
780 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER;
781 ip4s /= sizeof(*ip4);
782 if (ip4s > jail_max_af_ips) {
783 error = EINVAL;
784 vfs_opterror(opts, "too many IPv4 addresses");
785 goto done_errmsg;
786 }
787 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
788 bcopy(op, ip4, ip4s * sizeof(*ip4));
789 /*
790 * IP addresses are all sorted but ip[0] to preserve
791 * the primary IP address as given from userland.
792 * This special IP is used for unbound outgoing
793 * connections as well for "loopback" traffic in case
794 * source address selection cannot find any more fitting
795 * address to connect from.
796 */
797 if (ip4s > 1)
798 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4);
799 /*
800 * Check for duplicate addresses and do some simple
801 * zero and broadcast checks. If users give other bogus
802 * addresses it is their problem.
803 *
804 * We do not have to care about byte order for these
805 * checks so we will do them in NBO.
806 */
807 for (ii = 0; ii < ip4s; ii++) {
808 if (ip4[ii].s_addr == INADDR_ANY ||
809 ip4[ii].s_addr == INADDR_BROADCAST) {
810 error = EINVAL;
811 goto done_free;
812 }
813 if ((ii+1) < ip4s &&
814 (ip4[0].s_addr == ip4[ii+1].s_addr ||
815 ip4[ii].s_addr == ip4[ii+1].s_addr)) {
816 error = EINVAL;
817 goto done_free;
818 }
819 }
820 }
821 }
822 #endif
823
824 #ifdef INET6
825 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
826 if (error == ENOENT)
827 ip6s = (pr_flags & PR_IP6_DISABLE) ? 0 : -1;
828 else if (error != 0)
829 goto done_free;
830 else if (ip6s & (sizeof(*ip6) - 1)) {
831 error = EINVAL;
832 goto done_free;
833 } else {
834 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE;
835 if (ip6s == 0)
836 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE;
837 else {
838 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER;
839 ip6s /= sizeof(*ip6);
840 if (ip6s > jail_max_af_ips) {
841 error = EINVAL;
842 vfs_opterror(opts, "too many IPv6 addresses");
843 goto done_errmsg;
844 }
845 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
846 bcopy(op, ip6, ip6s * sizeof(*ip6));
847 if (ip6s > 1)
848 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6);
849 for (ii = 0; ii < ip6s; ii++) {
850 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
851 error = EINVAL;
852 goto done_free;
853 }
854 if ((ii+1) < ip6s &&
855 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
856 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
857 {
858 error = EINVAL;
859 goto done_free;
860 }
861 }
862 }
863 }
864 #endif
865
866 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
867 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
868 error = EINVAL;
869 vfs_opterror(opts,
870 "vnet jails cannot have IP address restrictions");
871 goto done_errmsg;
872 }
873 #endif
874
875 root = NULL;
876 error = vfs_getopt(opts, "path", (void **)&path, &len);
877 if (error == ENOENT)
878 path = NULL;
879 else if (error != 0)
880 goto done_free;
881 else {
882 if (flags & JAIL_UPDATE) {
883 error = EINVAL;
884 vfs_opterror(opts,
885 "path cannot be changed after creation");
886 goto done_errmsg;
887 }
888 if (len == 0 || path[len - 1] != '\0') {
889 error = EINVAL;
890 goto done_free;
891 }
892 if (len < 2 || (len == 2 && path[0] == '/'))
893 path = NULL;
894 else {
895 /* Leave room for a real-root full pathname. */
896 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/")
897 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) {
898 error = ENAMETOOLONG;
899 goto done_free;
900 }
901 NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW, UIO_SYSSPACE,
902 path, td);
903 error = namei(&nd);
904 if (error)
905 goto done_free;
906 vfslocked = NDHASGIANT(&nd);
907 root = nd.ni_vp;
908 NDFREE(&nd, NDF_ONLY_PNBUF);
909 if (root->v_type != VDIR) {
910 error = ENOTDIR;
911 vrele(root);
912 VFS_UNLOCK_GIANT(vfslocked);
913 goto done_free;
914 }
915 VFS_UNLOCK_GIANT(vfslocked);
916 }
917 }
918
919 /*
920 * Grab the allprison lock before letting modules check their
921 * parameters. Once we have it, do not let go so we'll have a
922 * consistent view of the OSD list.
923 */
924 sx_xlock(&allprison_lock);
925 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts);
926 if (error)
927 goto done_unlock_list;
928
929 /* By now, all parameters should have been noted. */
930 TAILQ_FOREACH(opt, opts, link) {
931 if (!opt->seen && strcmp(opt->name, "errmsg")) {
932 error = EINVAL;
933 vfs_opterror(opts, "unknown parameter: %s", opt->name);
934 goto done_unlock_list;
935 }
936 }
937
938 /*
939 * See if we are creating a new record or updating an existing one.
940 * This abuses the file error codes ENOENT and EEXIST.
941 */
942 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
943 if (!cuflags) {
944 error = EINVAL;
945 vfs_opterror(opts, "no valid operation (create or update)");
946 goto done_unlock_list;
947 }
948 pr = NULL;
949 namelc = NULL;
950 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
951 namelc = strrchr(name, '.');
952 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
953 if (*p != '\0')
954 jid = 0;
955 }
956 if (jid != 0) {
957 /*
958 * See if a requested jid already exists. There is an
959 * information leak here if the jid exists but is not within
960 * the caller's jail hierarchy. Jail creators will get EEXIST
961 * even though they cannot see the jail, and CREATE | UPDATE
962 * will return ENOENT which is not normally a valid error.
963 */
964 if (jid < 0) {
965 error = EINVAL;
966 vfs_opterror(opts, "negative jid");
967 goto done_unlock_list;
968 }
969 pr = prison_find(jid);
970 if (pr != NULL) {
971 ppr = pr->pr_parent;
972 /* Create: jid must not exist. */
973 if (cuflags == JAIL_CREATE) {
974 mtx_unlock(&pr->pr_mtx);
975 error = EEXIST;
976 vfs_opterror(opts, "jail %d already exists",
977 jid);
978 goto done_unlock_list;
979 }
980 if (!prison_ischild(mypr, pr)) {
981 mtx_unlock(&pr->pr_mtx);
982 pr = NULL;
983 } else if (pr->pr_uref == 0) {
984 if (!(flags & JAIL_DYING)) {
985 mtx_unlock(&pr->pr_mtx);
986 error = ENOENT;
987 vfs_opterror(opts, "jail %d is dying",
988 jid);
989 goto done_unlock_list;
990 } else if ((flags & JAIL_ATTACH) ||
991 (pr_flags & PR_PERSIST)) {
992 /*
993 * A dying jail might be resurrected
994 * (via attach or persist), but first
995 * it must determine if another jail
996 * has claimed its name. Accomplish
997 * this by implicitly re-setting the
998 * name.
999 */
1000 if (name == NULL)
1001 name = prison_name(mypr, pr);
1002 }
1003 }
1004 }
1005 if (pr == NULL) {
1006 /* Update: jid must exist. */
1007 if (cuflags == JAIL_UPDATE) {
1008 error = ENOENT;
1009 vfs_opterror(opts, "jail %d not found", jid);
1010 goto done_unlock_list;
1011 }
1012 }
1013 }
1014 /*
1015 * If the caller provided a name, look for a jail by that name.
1016 * This has different semantics for creates and updates keyed by jid
1017 * (where the name must not already exist in a different jail),
1018 * and updates keyed by the name itself (where the name must exist
1019 * because that is the jail being updated).
1020 */
1021 if (name != NULL) {
1022 namelc = strrchr(name, '.');
1023 if (namelc == NULL)
1024 namelc = name;
1025 else {
1026 /*
1027 * This is a hierarchical name. Split it into the
1028 * parent and child names, and make sure the parent
1029 * exists or matches an already found jail.
1030 */
1031 *namelc = '\0';
1032 if (pr != NULL) {
1033 if (strncmp(name, ppr->pr_name, namelc - name)
1034 || ppr->pr_name[namelc - name] != '\0') {
1035 mtx_unlock(&pr->pr_mtx);
1036 error = EINVAL;
1037 vfs_opterror(opts,
1038 "cannot change jail's parent");
1039 goto done_unlock_list;
1040 }
1041 } else {
1042 ppr = prison_find_name(mypr, name);
1043 if (ppr == NULL) {
1044 error = ENOENT;
1045 vfs_opterror(opts,
1046 "jail \"%s\" not found", name);
1047 goto done_unlock_list;
1048 }
1049 mtx_unlock(&ppr->pr_mtx);
1050 }
1051 name = ++namelc;
1052 }
1053 if (name[0] != '\0') {
1054 namelen =
1055 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1056 name_again:
1057 deadpr = NULL;
1058 FOREACH_PRISON_CHILD(ppr, tpr) {
1059 if (tpr != pr && tpr->pr_ref > 0 &&
1060 !strcmp(tpr->pr_name + namelen, name)) {
1061 if (pr == NULL &&
1062 cuflags != JAIL_CREATE) {
1063 mtx_lock(&tpr->pr_mtx);
1064 if (tpr->pr_ref > 0) {
1065 /*
1066 * Use this jail
1067 * for updates.
1068 */
1069 if (tpr->pr_uref > 0) {
1070 pr = tpr;
1071 break;
1072 }
1073 deadpr = tpr;
1074 }
1075 mtx_unlock(&tpr->pr_mtx);
1076 } else if (tpr->pr_uref > 0) {
1077 /*
1078 * Create, or update(jid):
1079 * name must not exist in an
1080 * active sibling jail.
1081 */
1082 error = EEXIST;
1083 if (pr != NULL)
1084 mtx_unlock(&pr->pr_mtx);
1085 vfs_opterror(opts,
1086 "jail \"%s\" already exists",
1087 name);
1088 goto done_unlock_list;
1089 }
1090 }
1091 }
1092 /* If no active jail is found, use a dying one. */
1093 if (deadpr != NULL && pr == NULL) {
1094 if (flags & JAIL_DYING) {
1095 mtx_lock(&deadpr->pr_mtx);
1096 if (deadpr->pr_ref == 0) {
1097 mtx_unlock(&deadpr->pr_mtx);
1098 goto name_again;
1099 }
1100 pr = deadpr;
1101 } else if (cuflags == JAIL_UPDATE) {
1102 error = ENOENT;
1103 vfs_opterror(opts,
1104 "jail \"%s\" is dying", name);
1105 goto done_unlock_list;
1106 }
1107 }
1108 /* Update: name must exist if no jid. */
1109 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1110 error = ENOENT;
1111 vfs_opterror(opts, "jail \"%s\" not found",
1112 name);
1113 goto done_unlock_list;
1114 }
1115 }
1116 }
1117 /* Update: must provide a jid or name. */
1118 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1119 error = ENOENT;
1120 vfs_opterror(opts, "update specified no jail");
1121 goto done_unlock_list;
1122 }
1123
1124 /* If there's no prison to update, create a new one and link it in. */
1125 if (pr == NULL) {
1126 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1127 if (tpr->pr_childcount >= tpr->pr_childmax) {
1128 error = EPERM;
1129 vfs_opterror(opts, "prison limit exceeded");
1130 goto done_unlock_list;
1131 }
1132 created = 1;
1133 mtx_lock(&ppr->pr_mtx);
1134 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) {
1135 mtx_unlock(&ppr->pr_mtx);
1136 error = ENOENT;
1137 vfs_opterror(opts, "parent jail went away!");
1138 goto done_unlock_list;
1139 }
1140 ppr->pr_ref++;
1141 ppr->pr_uref++;
1142 mtx_unlock(&ppr->pr_mtx);
1143 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1144 if (jid == 0) {
1145 /* Find the next free jid. */
1146 jid = lastprid + 1;
1147 findnext:
1148 if (jid == JAIL_MAX)
1149 jid = 1;
1150 TAILQ_FOREACH(tpr, &allprison, pr_list) {
1151 if (tpr->pr_id < jid)
1152 continue;
1153 if (tpr->pr_id > jid || tpr->pr_ref == 0) {
1154 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1155 break;
1156 }
1157 if (jid == lastprid) {
1158 error = EAGAIN;
1159 vfs_opterror(opts,
1160 "no available jail IDs");
1161 free(pr, M_PRISON);
1162 prison_deref(ppr, PD_DEREF |
1163 PD_DEUREF | PD_LIST_XLOCKED);
1164 goto done_releroot;
1165 }
1166 jid++;
1167 goto findnext;
1168 }
1169 lastprid = jid;
1170 } else {
1171 /*
1172 * The jail already has a jid (that did not yet exist),
1173 * so just find where to insert it.
1174 */
1175 TAILQ_FOREACH(tpr, &allprison, pr_list)
1176 if (tpr->pr_id >= jid) {
1177 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1178 break;
1179 }
1180 }
1181 if (tpr == NULL)
1182 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1183 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1184 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1185 tpr->pr_childcount++;
1186
1187 pr->pr_parent = ppr;
1188 pr->pr_id = jid;
1189
1190 /* Set some default values, and inherit some from the parent. */
1191 if (name == NULL)
1192 name = "";
1193 if (path == NULL) {
1194 path = "/";
1195 root = mypr->pr_root;
1196 vref(root);
1197 }
1198 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1199 pr->pr_flags |= PR_HOST;
1200 #if defined(INET) || defined(INET6)
1201 #ifdef VIMAGE
1202 if (!(pr_flags & PR_VNET))
1203 #endif
1204 {
1205 #ifdef INET
1206 if (!(ch_flags & PR_IP4_USER))
1207 pr->pr_flags |=
1208 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE;
1209 else if (!(pr_flags & PR_IP4_USER)) {
1210 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1211 if (ppr->pr_ip4 != NULL) {
1212 pr->pr_ip4s = ppr->pr_ip4s;
1213 pr->pr_ip4 = malloc(pr->pr_ip4s *
1214 sizeof(struct in_addr), M_PRISON,
1215 M_WAITOK);
1216 bcopy(ppr->pr_ip4, pr->pr_ip4,
1217 pr->pr_ip4s * sizeof(*pr->pr_ip4));
1218 }
1219 }
1220 #endif
1221 #ifdef INET6
1222 if (!(ch_flags & PR_IP6_USER))
1223 pr->pr_flags |=
1224 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE;
1225 else if (!(pr_flags & PR_IP6_USER)) {
1226 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1227 if (ppr->pr_ip6 != NULL) {
1228 pr->pr_ip6s = ppr->pr_ip6s;
1229 pr->pr_ip6 = malloc(pr->pr_ip6s *
1230 sizeof(struct in6_addr), M_PRISON,
1231 M_WAITOK);
1232 bcopy(ppr->pr_ip6, pr->pr_ip6,
1233 pr->pr_ip6s * sizeof(*pr->pr_ip6));
1234 }
1235 }
1236 #endif
1237 }
1238 #endif
1239 /* Source address selection is always on by default. */
1240 pr->pr_flags |= _PR_IP_SADDRSEL;
1241
1242 pr->pr_securelevel = ppr->pr_securelevel;
1243 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1244 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
1245
1246 LIST_INIT(&pr->pr_children);
1247 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1248
1249 #ifdef VIMAGE
1250 /* Allocate a new vnet if specified. */
1251 pr->pr_vnet = (pr_flags & PR_VNET)
1252 ? vnet_alloc() : ppr->pr_vnet;
1253 #endif
1254 /*
1255 * Allocate a dedicated cpuset for each jail.
1256 * Unlike other initial settings, this may return an erorr.
1257 */
1258 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1259 if (error) {
1260 prison_deref(pr, PD_LIST_XLOCKED);
1261 goto done_releroot;
1262 }
1263
1264 mtx_lock(&pr->pr_mtx);
1265 /*
1266 * New prisons do not yet have a reference, because we do not
1267 * want other to see the incomplete prison once the
1268 * allprison_lock is downgraded.
1269 */
1270 } else {
1271 created = 0;
1272 /*
1273 * Grab a reference for existing prisons, to ensure they
1274 * continue to exist for the duration of the call.
1275 */
1276 pr->pr_ref++;
1277 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1278 if ((pr->pr_flags & PR_VNET) &&
1279 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1280 error = EINVAL;
1281 vfs_opterror(opts,
1282 "vnet jails cannot have IP address restrictions");
1283 goto done_deref_locked;
1284 }
1285 #endif
1286 #ifdef INET
1287 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1288 error = EINVAL;
1289 vfs_opterror(opts,
1290 "ip4 cannot be changed after creation");
1291 goto done_deref_locked;
1292 }
1293 #endif
1294 #ifdef INET6
1295 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1296 error = EINVAL;
1297 vfs_opterror(opts,
1298 "ip6 cannot be changed after creation");
1299 goto done_deref_locked;
1300 }
1301 #endif
1302 }
1303
1304 /* Do final error checking before setting anything. */
1305 if (gotslevel) {
1306 if (slevel < ppr->pr_securelevel) {
1307 error = EPERM;
1308 goto done_deref_locked;
1309 }
1310 }
1311 if (gotchildmax) {
1312 if (childmax >= ppr->pr_childmax) {
1313 error = EPERM;
1314 goto done_deref_locked;
1315 }
1316 }
1317 if (gotenforce) {
1318 if (enforce < ppr->pr_enforce_statfs) {
1319 error = EPERM;
1320 goto done_deref_locked;
1321 }
1322 }
1323 #ifdef INET
1324 if (ip4s > 0) {
1325 if (ppr->pr_flags & PR_IP4) {
1326 /*
1327 * Make sure the new set of IP addresses is a
1328 * subset of the parent's list. Don't worry
1329 * about the parent being unlocked, as any
1330 * setting is done with allprison_lock held.
1331 */
1332 for (ij = 0; ij < ppr->pr_ip4s; ij++)
1333 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
1334 break;
1335 if (ij == ppr->pr_ip4s) {
1336 error = EPERM;
1337 goto done_deref_locked;
1338 }
1339 if (ip4s > 1) {
1340 for (ii = ij = 1; ii < ip4s; ii++) {
1341 if (ip4[ii].s_addr ==
1342 ppr->pr_ip4[0].s_addr)
1343 continue;
1344 for (; ij < ppr->pr_ip4s; ij++)
1345 if (ip4[ii].s_addr ==
1346 ppr->pr_ip4[ij].s_addr)
1347 break;
1348 if (ij == ppr->pr_ip4s)
1349 break;
1350 }
1351 if (ij == ppr->pr_ip4s) {
1352 error = EPERM;
1353 goto done_deref_locked;
1354 }
1355 }
1356 }
1357 /*
1358 * Check for conflicting IP addresses. We permit them
1359 * if there is no more than one IP on each jail. If
1360 * there is a duplicate on a jail with more than one
1361 * IP stop checking and return error.
1362 */
1363 tppr = ppr;
1364 #ifdef VIMAGE
1365 for (; tppr != &prison0; tppr = tppr->pr_parent)
1366 if (tppr->pr_flags & PR_VNET)
1367 break;
1368 #endif
1369 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1370 if (tpr == pr ||
1371 #ifdef VIMAGE
1372 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1373 #endif
1374 tpr->pr_uref == 0) {
1375 descend = 0;
1376 continue;
1377 }
1378 if (!(tpr->pr_flags & PR_IP4_USER))
1379 continue;
1380 descend = 0;
1381 if (tpr->pr_ip4 == NULL ||
1382 (ip4s == 1 && tpr->pr_ip4s == 1))
1383 continue;
1384 for (ii = 0; ii < ip4s; ii++) {
1385 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) {
1386 error = EADDRINUSE;
1387 vfs_opterror(opts,
1388 "IPv4 addresses clash");
1389 goto done_deref_locked;
1390 }
1391 }
1392 }
1393 }
1394 #endif
1395 #ifdef INET6
1396 if (ip6s > 0) {
1397 if (ppr->pr_flags & PR_IP6) {
1398 /*
1399 * Make sure the new set of IP addresses is a
1400 * subset of the parent's list.
1401 */
1402 for (ij = 0; ij < ppr->pr_ip6s; ij++)
1403 if (IN6_ARE_ADDR_EQUAL(&ip6[0],
1404 &ppr->pr_ip6[ij]))
1405 break;
1406 if (ij == ppr->pr_ip6s) {
1407 error = EPERM;
1408 goto done_deref_locked;
1409 }
1410 if (ip6s > 1) {
1411 for (ii = ij = 1; ii < ip6s; ii++) {
1412 if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
1413 &ppr->pr_ip6[0]))
1414 continue;
1415 for (; ij < ppr->pr_ip6s; ij++)
1416 if (IN6_ARE_ADDR_EQUAL(
1417 &ip6[ii], &ppr->pr_ip6[ij]))
1418 break;
1419 if (ij == ppr->pr_ip6s)
1420 break;
1421 }
1422 if (ij == ppr->pr_ip6s) {
1423 error = EPERM;
1424 goto done_deref_locked;
1425 }
1426 }
1427 }
1428 /* Check for conflicting IP addresses. */
1429 tppr = ppr;
1430 #ifdef VIMAGE
1431 for (; tppr != &prison0; tppr = tppr->pr_parent)
1432 if (tppr->pr_flags & PR_VNET)
1433 break;
1434 #endif
1435 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1436 if (tpr == pr ||
1437 #ifdef VIMAGE
1438 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1439 #endif
1440 tpr->pr_uref == 0) {
1441 descend = 0;
1442 continue;
1443 }
1444 if (!(tpr->pr_flags & PR_IP6_USER))
1445 continue;
1446 descend = 0;
1447 if (tpr->pr_ip6 == NULL ||
1448 (ip6s == 1 && tpr->pr_ip6s == 1))
1449 continue;
1450 for (ii = 0; ii < ip6s; ii++) {
1451 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) {
1452 error = EADDRINUSE;
1453 vfs_opterror(opts,
1454 "IPv6 addresses clash");
1455 goto done_deref_locked;
1456 }
1457 }
1458 }
1459 }
1460 #endif
1461 onamelen = namelen = 0;
1462 if (name != NULL) {
1463 /* Give a default name of the jid. */
1464 if (name[0] == '\0')
1465 snprintf(name = numbuf, sizeof(numbuf), "%d", jid);
1466 else if (*namelc == '' || (strtoul(namelc, &p, 10) != jid &&
1467 *p == '\0')) {
1468 error = EINVAL;
1469 vfs_opterror(opts,
1470 "name cannot be numeric (unless it is the jid)");
1471 goto done_deref_locked;
1472 }
1473 /*
1474 * Make sure the name isn't too long for the prison or its
1475 * children.
1476 */
1477 onamelen = strlen(pr->pr_name);
1478 namelen = strlen(name);
1479 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) {
1480 error = ENAMETOOLONG;
1481 goto done_deref_locked;
1482 }
1483 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1484 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
1485 sizeof(pr->pr_name)) {
1486 error = ENAMETOOLONG;
1487 goto done_deref_locked;
1488 }
1489 }
1490 }
1491 if (pr_allow & ~ppr->pr_allow) {
1492 error = EPERM;
1493 goto done_deref_locked;
1494 }
1495
1496 /* Set the parameters of the prison. */
1497 #ifdef INET
1498 redo_ip4 = 0;
1499 if (pr_flags & PR_IP4_USER) {
1500 pr->pr_flags |= PR_IP4;
1501 free(pr->pr_ip4, M_PRISON);
1502 pr->pr_ip4s = ip4s;
1503 pr->pr_ip4 = ip4;
1504 ip4 = NULL;
1505 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1506 #ifdef VIMAGE
1507 if (tpr->pr_flags & PR_VNET) {
1508 descend = 0;
1509 continue;
1510 }
1511 #endif
1512 if (prison_restrict_ip4(tpr, NULL)) {
1513 redo_ip4 = 1;
1514 descend = 0;
1515 }
1516 }
1517 }
1518 #endif
1519 #ifdef INET6
1520 redo_ip6 = 0;
1521 if (pr_flags & PR_IP6_USER) {
1522 pr->pr_flags |= PR_IP6;
1523 free(pr->pr_ip6, M_PRISON);
1524 pr->pr_ip6s = ip6s;
1525 pr->pr_ip6 = ip6;
1526 ip6 = NULL;
1527 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1528 #ifdef VIMAGE
1529 if (tpr->pr_flags & PR_VNET) {
1530 descend = 0;
1531 continue;
1532 }
1533 #endif
1534 if (prison_restrict_ip6(tpr, NULL)) {
1535 redo_ip6 = 1;
1536 descend = 0;
1537 }
1538 }
1539 }
1540 #endif
1541 if (gotslevel) {
1542 pr->pr_securelevel = slevel;
1543 /* Set all child jails to be at least this level. */
1544 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1545 if (tpr->pr_securelevel < slevel)
1546 tpr->pr_securelevel = slevel;
1547 }
1548 if (gotchildmax) {
1549 pr->pr_childmax = childmax;
1550 /* Set all child jails to under this limit. */
1551 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
1552 if (tpr->pr_childmax > childmax - level)
1553 tpr->pr_childmax = childmax > level
1554 ? childmax - level : 0;
1555 }
1556 if (gotenforce) {
1557 pr->pr_enforce_statfs = enforce;
1558 /* Pass this restriction on to the children. */
1559 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1560 if (tpr->pr_enforce_statfs < enforce)
1561 tpr->pr_enforce_statfs = enforce;
1562 }
1563 if (name != NULL) {
1564 if (ppr == &prison0)
1565 strlcpy(pr->pr_name, name, sizeof(pr->pr_name));
1566 else
1567 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
1568 ppr->pr_name, name);
1569 /* Change this component of child names. */
1570 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1571 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
1572 strlen(tpr->pr_name + onamelen) + 1);
1573 bcopy(pr->pr_name, tpr->pr_name, namelen);
1574 }
1575 }
1576 if (path != NULL) {
1577 /* Try to keep a real-rooted full pathname. */
1578 if (path[0] == '/' && strcmp(mypr->pr_path, "/"))
1579 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s",
1580 mypr->pr_path, path);
1581 else
1582 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
1583 pr->pr_root = root;
1584 }
1585 if (PR_HOST & ch_flags & ~pr_flags) {
1586 if (pr->pr_flags & PR_HOST) {
1587 /*
1588 * Copy the parent's host info. As with pr_ip4 above,
1589 * the lack of a lock on the parent is not a problem;
1590 * it is always set with allprison_lock at least
1591 * shared, and is held exclusively here.
1592 */
1593 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
1594 sizeof(pr->pr_hostname));
1595 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
1596 sizeof(pr->pr_domainname));
1597 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
1598 sizeof(pr->pr_hostuuid));
1599 pr->pr_hostid = pr->pr_parent->pr_hostid;
1600 }
1601 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
1602 /* Set this prison, and any descendants without PR_HOST. */
1603 if (host != NULL)
1604 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
1605 if (domain != NULL)
1606 strlcpy(pr->pr_domainname, domain,
1607 sizeof(pr->pr_domainname));
1608 if (uuid != NULL)
1609 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
1610 if (gothid)
1611 pr->pr_hostid = hid;
1612 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1613 if (tpr->pr_flags & PR_HOST)
1614 descend = 0;
1615 else {
1616 if (host != NULL)
1617 strlcpy(tpr->pr_hostname,
1618 pr->pr_hostname,
1619 sizeof(tpr->pr_hostname));
1620 if (domain != NULL)
1621 strlcpy(tpr->pr_domainname,
1622 pr->pr_domainname,
1623 sizeof(tpr->pr_domainname));
1624 if (uuid != NULL)
1625 strlcpy(tpr->pr_hostuuid,
1626 pr->pr_hostuuid,
1627 sizeof(tpr->pr_hostuuid));
1628 if (gothid)
1629 tpr->pr_hostid = hid;
1630 }
1631 }
1632 }
1633 if ((tallow = ch_allow & ~pr_allow)) {
1634 /* Clear allow bits in all children. */
1635 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1636 tpr->pr_allow &= ~tallow;
1637 }
1638 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
1639 /*
1640 * Persistent prisons get an extra reference, and prisons losing their
1641 * persist flag lose that reference. Only do this for existing prisons
1642 * for now, so new ones will remain unseen until after the module
1643 * handlers have completed.
1644 */
1645 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) {
1646 if (pr_flags & PR_PERSIST) {
1647 pr->pr_ref++;
1648 pr->pr_uref++;
1649 } else {
1650 pr->pr_ref--;
1651 pr->pr_uref--;
1652 }
1653 }
1654 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
1655 mtx_unlock(&pr->pr_mtx);
1656
1657 /* Locks may have prevented a complete restriction of child IP
1658 * addresses. If so, allocate some more memory and try again.
1659 */
1660 #ifdef INET
1661 while (redo_ip4) {
1662 ip4s = pr->pr_ip4s;
1663 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
1664 mtx_lock(&pr->pr_mtx);
1665 redo_ip4 = 0;
1666 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1667 #ifdef VIMAGE
1668 if (tpr->pr_flags & PR_VNET) {
1669 descend = 0;
1670 continue;
1671 }
1672 #endif
1673 if (prison_restrict_ip4(tpr, ip4)) {
1674 if (ip4 != NULL)
1675 ip4 = NULL;
1676 else
1677 redo_ip4 = 1;
1678 }
1679 }
1680 mtx_unlock(&pr->pr_mtx);
1681 }
1682 #endif
1683 #ifdef INET6
1684 while (redo_ip6) {
1685 ip6s = pr->pr_ip6s;
1686 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
1687 mtx_lock(&pr->pr_mtx);
1688 redo_ip6 = 0;
1689 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1690 #ifdef VIMAGE
1691 if (tpr->pr_flags & PR_VNET) {
1692 descend = 0;
1693 continue;
1694 }
1695 #endif
1696 if (prison_restrict_ip6(tpr, ip6)) {
1697 if (ip6 != NULL)
1698 ip6 = NULL;
1699 else
1700 redo_ip6 = 1;
1701 }
1702 }
1703 mtx_unlock(&pr->pr_mtx);
1704 }
1705 #endif
1706
1707 /* Let the modules do their work. */
1708 sx_downgrade(&allprison_lock);
1709 if (created) {
1710 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
1711 if (error) {
1712 prison_deref(pr, PD_LIST_SLOCKED);
1713 goto done_errmsg;
1714 }
1715 }
1716 error = osd_jail_call(pr, PR_METHOD_SET, opts);
1717 if (error) {
1718 prison_deref(pr, created
1719 ? PD_LIST_SLOCKED
1720 : PD_DEREF | PD_LIST_SLOCKED);
1721 goto done_errmsg;
1722 }
1723
1724 /* Attach this process to the prison if requested. */
1725 if (flags & JAIL_ATTACH) {
1726 mtx_lock(&pr->pr_mtx);
1727 error = do_jail_attach(td, pr);
1728 if (error) {
1729 vfs_opterror(opts, "attach failed");
1730 if (!created)
1731 prison_deref(pr, PD_DEREF);
1732 goto done_errmsg;
1733 }
1734 }
1735
1736 /*
1737 * Now that it is all there, drop the temporary reference from existing
1738 * prisons. Or add a reference to newly created persistent prisons
1739 * (which was not done earlier so that the prison would not be publicly
1740 * visible).
1741 */
1742 if (!created) {
1743 prison_deref(pr, (flags & JAIL_ATTACH)
1744 ? PD_DEREF
1745 : PD_DEREF | PD_LIST_SLOCKED);
1746 } else {
1747 if (pr_flags & PR_PERSIST) {
1748 mtx_lock(&pr->pr_mtx);
1749 pr->pr_ref++;
1750 pr->pr_uref++;
1751 mtx_unlock(&pr->pr_mtx);
1752 }
1753 if (!(flags & JAIL_ATTACH))
1754 sx_sunlock(&allprison_lock);
1755 }
1756 td->td_retval[0] = pr->pr_id;
1757 goto done_errmsg;
1758
1759 done_deref_locked:
1760 prison_deref(pr, created
1761 ? PD_LOCKED | PD_LIST_XLOCKED
1762 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
1763 goto done_releroot;
1764 done_unlock_list:
1765 sx_xunlock(&allprison_lock);
1766 done_releroot:
1767 if (root != NULL) {
1768 vfslocked = VFS_LOCK_GIANT(root->v_mount);
1769 vrele(root);
1770 VFS_UNLOCK_GIANT(vfslocked);
1771 }
1772 done_errmsg:
1773 if (error) {
1774 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
1775 if (errmsg_len > 0) {
1776 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
1777 if (errmsg_pos > 0) {
1778 if (optuio->uio_segflg == UIO_SYSSPACE)
1779 bcopy(errmsg,
1780 optuio->uio_iov[errmsg_pos].iov_base,
1781 errmsg_len);
1782 else
1783 copyout(errmsg,
1784 optuio->uio_iov[errmsg_pos].iov_base,
1785 errmsg_len);
1786 }
1787 }
1788 }
1789 done_free:
1790 #ifdef INET
1791 free(ip4, M_PRISON);
1792 #endif
1793 #ifdef INET6
1794 free(ip6, M_PRISON);
1795 #endif
1796 vfs_freeopts(opts);
1797 return (error);
1798 }
1799
1800
1801 /*
1802 * struct jail_get_args {
1803 * struct iovec *iovp;
1804 * unsigned int iovcnt;
1805 * int flags;
1806 * };
1807 */
1808 int
1809 jail_get(struct thread *td, struct jail_get_args *uap)
1810 {
1811 struct uio *auio;
1812 int error;
1813
1814 /* Check that we have an even number of iovecs. */
1815 if (uap->iovcnt & 1)
1816 return (EINVAL);
1817
1818 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
1819 if (error)
1820 return (error);
1821 error = kern_jail_get(td, auio, uap->flags);
1822 if (error == 0)
1823 error = copyout(auio->uio_iov, uap->iovp,
1824 uap->iovcnt * sizeof (struct iovec));
1825 free(auio, M_IOV);
1826 return (error);
1827 }
1828
1829 int
1830 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
1831 {
1832 struct prison *pr, *mypr;
1833 struct vfsopt *opt;
1834 struct vfsoptlist *opts;
1835 char *errmsg, *name;
1836 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos;
1837
1838 if (flags & ~JAIL_GET_MASK)
1839 return (EINVAL);
1840
1841 /* Get the parameter list. */
1842 error = vfs_buildopts(optuio, &opts);
1843 if (error)
1844 return (error);
1845 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
1846 mypr = td->td_ucred->cr_prison;
1847
1848 /*
1849 * Find the prison specified by one of: lastjid, jid, name.
1850 */
1851 sx_slock(&allprison_lock);
1852 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
1853 if (error == 0) {
1854 TAILQ_FOREACH(pr, &allprison, pr_list) {
1855 if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
1856 mtx_lock(&pr->pr_mtx);
1857 if (pr->pr_ref > 0 &&
1858 (pr->pr_uref > 0 || (flags & JAIL_DYING)))
1859 break;
1860 mtx_unlock(&pr->pr_mtx);
1861 }
1862 }
1863 if (pr != NULL)
1864 goto found_prison;
1865 error = ENOENT;
1866 vfs_opterror(opts, "no jail after %d", jid);
1867 goto done_unlock_list;
1868 } else if (error != ENOENT)
1869 goto done_unlock_list;
1870
1871 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
1872 if (error == 0) {
1873 if (jid != 0) {
1874 pr = prison_find_child(mypr, jid);
1875 if (pr != NULL) {
1876 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1877 mtx_unlock(&pr->pr_mtx);
1878 error = ENOENT;
1879 vfs_opterror(opts, "jail %d is dying",
1880 jid);
1881 goto done_unlock_list;
1882 }
1883 goto found_prison;
1884 }
1885 error = ENOENT;
1886 vfs_opterror(opts, "jail %d not found", jid);
1887 goto done_unlock_list;
1888 }
1889 } else if (error != ENOENT)
1890 goto done_unlock_list;
1891
1892 error = vfs_getopt(opts, "name", (void **)&name, &len);
1893 if (error == 0) {
1894 if (len == 0 || name[len - 1] != '\0') {
1895 error = EINVAL;
1896 goto done_unlock_list;
1897 }
1898 pr = prison_find_name(mypr, name);
1899 if (pr != NULL) {
1900 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1901 mtx_unlock(&pr->pr_mtx);
1902 error = ENOENT;
1903 vfs_opterror(opts, "jail \"%s\" is dying",
1904 name);
1905 goto done_unlock_list;
1906 }
1907 goto found_prison;
1908 }
1909 error = ENOENT;
1910 vfs_opterror(opts, "jail \"%s\" not found", name);
1911 goto done_unlock_list;
1912 } else if (error != ENOENT)
1913 goto done_unlock_list;
1914
1915 vfs_opterror(opts, "no jail specified");
1916 error = ENOENT;
1917 goto done_unlock_list;
1918
1919 found_prison:
1920 /* Get the parameters of the prison. */
1921 pr->pr_ref++;
1922 locked = PD_LOCKED;
1923 td->td_retval[0] = pr->pr_id;
1924 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
1925 if (error != 0 && error != ENOENT)
1926 goto done_deref;
1927 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
1928 error = vfs_setopt(opts, "parent", &i, sizeof(i));
1929 if (error != 0 && error != ENOENT)
1930 goto done_deref;
1931 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
1932 if (error != 0 && error != ENOENT)
1933 goto done_deref;
1934 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
1935 sizeof(pr->pr_cpuset->cs_id));
1936 if (error != 0 && error != ENOENT)
1937 goto done_deref;
1938 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
1939 if (error != 0 && error != ENOENT)
1940 goto done_deref;
1941 #ifdef INET
1942 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
1943 pr->pr_ip4s * sizeof(*pr->pr_ip4));
1944 if (error != 0 && error != ENOENT)
1945 goto done_deref;
1946 #endif
1947 #ifdef INET6
1948 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
1949 pr->pr_ip6s * sizeof(*pr->pr_ip6));
1950 if (error != 0 && error != ENOENT)
1951 goto done_deref;
1952 #endif
1953 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
1954 sizeof(pr->pr_securelevel));
1955 if (error != 0 && error != ENOENT)
1956 goto done_deref;
1957 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
1958 sizeof(pr->pr_childcount));
1959 if (error != 0 && error != ENOENT)
1960 goto done_deref;
1961 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
1962 sizeof(pr->pr_childmax));
1963 if (error != 0 && error != ENOENT)
1964 goto done_deref;
1965 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
1966 if (error != 0 && error != ENOENT)
1967 goto done_deref;
1968 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
1969 if (error != 0 && error != ENOENT)
1970 goto done_deref;
1971 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
1972 if (error != 0 && error != ENOENT)
1973 goto done_deref;
1974 #ifdef COMPAT_FREEBSD32
1975 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
1976 uint32_t hid32 = pr->pr_hostid;
1977
1978 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
1979 } else
1980 #endif
1981 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
1982 sizeof(pr->pr_hostid));
1983 if (error != 0 && error != ENOENT)
1984 goto done_deref;
1985 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
1986 sizeof(pr->pr_enforce_statfs));
1987 if (error != 0 && error != ENOENT)
1988 goto done_deref;
1989 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
1990 fi++) {
1991 if (pr_flag_names[fi] == NULL)
1992 continue;
1993 i = (pr->pr_flags & (1 << fi)) ? 1 : 0;
1994 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i));
1995 if (error != 0 && error != ENOENT)
1996 goto done_deref;
1997 i = !i;
1998 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i));
1999 if (error != 0 && error != ENOENT)
2000 goto done_deref;
2001 }
2002 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
2003 fi++) {
2004 i = pr->pr_flags &
2005 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
2006 i = pr_flag_jailsys[fi].disable &&
2007 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE
2008 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW
2009 : JAIL_SYS_INHERIT;
2010 error =
2011 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i));
2012 if (error != 0 && error != ENOENT)
2013 goto done_deref;
2014 }
2015 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
2016 fi++) {
2017 if (pr_allow_names[fi] == NULL)
2018 continue;
2019 i = (pr->pr_allow & (1 << fi)) ? 1 : 0;
2020 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i));
2021 if (error != 0 && error != ENOENT)
2022 goto done_deref;
2023 i = !i;
2024 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i));
2025 if (error != 0 && error != ENOENT)
2026 goto done_deref;
2027 }
2028 i = (pr->pr_uref == 0);
2029 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2030 if (error != 0 && error != ENOENT)
2031 goto done_deref;
2032 i = !i;
2033 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2034 if (error != 0 && error != ENOENT)
2035 goto done_deref;
2036
2037 /* Get the module parameters. */
2038 mtx_unlock(&pr->pr_mtx);
2039 locked = 0;
2040 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2041 if (error)
2042 goto done_deref;
2043 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
2044
2045 /* By now, all parameters should have been noted. */
2046 TAILQ_FOREACH(opt, opts, link) {
2047 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2048 error = EINVAL;
2049 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2050 goto done_errmsg;
2051 }
2052 }
2053
2054 /* Write the fetched parameters back to userspace. */
2055 error = 0;
2056 TAILQ_FOREACH(opt, opts, link) {
2057 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2058 pos = 2 * opt->pos + 1;
2059 optuio->uio_iov[pos].iov_len = opt->len;
2060 if (opt->value != NULL) {
2061 if (optuio->uio_segflg == UIO_SYSSPACE) {
2062 bcopy(opt->value,
2063 optuio->uio_iov[pos].iov_base,
2064 opt->len);
2065 } else {
2066 error = copyout(opt->value,
2067 optuio->uio_iov[pos].iov_base,
2068 opt->len);
2069 if (error)
2070 break;
2071 }
2072 }
2073 }
2074 }
2075 goto done_errmsg;
2076
2077 done_deref:
2078 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
2079 goto done_errmsg;
2080
2081 done_unlock_list:
2082 sx_sunlock(&allprison_lock);
2083 done_errmsg:
2084 if (error && errmsg_pos >= 0) {
2085 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2086 errmsg_pos = 2 * errmsg_pos + 1;
2087 if (errmsg_len > 0) {
2088 if (optuio->uio_segflg == UIO_SYSSPACE)
2089 bcopy(errmsg,
2090 optuio->uio_iov[errmsg_pos].iov_base,
2091 errmsg_len);
2092 else
2093 copyout(errmsg,
2094 optuio->uio_iov[errmsg_pos].iov_base,
2095 errmsg_len);
2096 }
2097 }
2098 vfs_freeopts(opts);
2099 return (error);
2100 }
2101
2102
2103 /*
2104 * struct jail_remove_args {
2105 * int jid;
2106 * };
2107 */
2108 int
2109 jail_remove(struct thread *td, struct jail_remove_args *uap)
2110 {
2111 struct prison *pr, *cpr, *lpr, *tpr;
2112 int descend, error;
2113
2114 error = priv_check(td, PRIV_JAIL_REMOVE);
2115 if (error)
2116 return (error);
2117
2118 sx_xlock(&allprison_lock);
2119 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2120 if (pr == NULL) {
2121 sx_xunlock(&allprison_lock);
2122 return (EINVAL);
2123 }
2124
2125 /* Remove all descendants of this prison, then remove this prison. */
2126 pr->pr_ref++;
2127 pr->pr_flags |= PR_REMOVE;
2128 if (!LIST_EMPTY(&pr->pr_children)) {
2129 mtx_unlock(&pr->pr_mtx);
2130 lpr = NULL;
2131 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
2132 mtx_lock(&cpr->pr_mtx);
2133 if (cpr->pr_ref > 0) {
2134 tpr = cpr;
2135 cpr->pr_ref++;
2136 cpr->pr_flags |= PR_REMOVE;
2137 } else {
2138 /* Already removed - do not do it again. */
2139 tpr = NULL;
2140 }
2141 mtx_unlock(&cpr->pr_mtx);
2142 if (lpr != NULL) {
2143 mtx_lock(&lpr->pr_mtx);
2144 prison_remove_one(lpr);
2145 sx_xlock(&allprison_lock);
2146 }
2147 lpr = tpr;
2148 }
2149 if (lpr != NULL) {
2150 mtx_lock(&lpr->pr_mtx);
2151 prison_remove_one(lpr);
2152 sx_xlock(&allprison_lock);
2153 }
2154 mtx_lock(&pr->pr_mtx);
2155 }
2156 prison_remove_one(pr);
2157 return (0);
2158 }
2159
2160 static void
2161 prison_remove_one(struct prison *pr)
2162 {
2163 struct proc *p;
2164 int deuref;
2165
2166 /* If the prison was persistent, it is not anymore. */
2167 deuref = 0;
2168 if (pr->pr_flags & PR_PERSIST) {
2169 pr->pr_ref--;
2170 deuref = PD_DEUREF;
2171 pr->pr_flags &= ~PR_PERSIST;
2172 }
2173
2174 /*
2175 * jail_remove added a reference. If that's the only one, remove
2176 * the prison now.
2177 */
2178 KASSERT(pr->pr_ref > 0,
2179 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
2180 if (pr->pr_ref == 1) {
2181 prison_deref(pr,
2182 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
2183 return;
2184 }
2185
2186 mtx_unlock(&pr->pr_mtx);
2187 sx_xunlock(&allprison_lock);
2188 /*
2189 * Kill all processes unfortunate enough to be attached to this prison.
2190 */
2191 sx_slock(&allproc_lock);
2192 LIST_FOREACH(p, &allproc, p_list) {
2193 PROC_LOCK(p);
2194 if (p->p_state != PRS_NEW && p->p_ucred &&
2195 p->p_ucred->cr_prison == pr)
2196 psignal(p, SIGKILL);
2197 PROC_UNLOCK(p);
2198 }
2199 sx_sunlock(&allproc_lock);
2200 /* Remove the temporary reference added by jail_remove. */
2201 prison_deref(pr, deuref | PD_DEREF);
2202 }
2203
2204
2205 /*
2206 * struct jail_attach_args {
2207 * int jid;
2208 * };
2209 */
2210 int
2211 jail_attach(struct thread *td, struct jail_attach_args *uap)
2212 {
2213 struct prison *pr;
2214 int error;
2215
2216 error = priv_check(td, PRIV_JAIL_ATTACH);
2217 if (error)
2218 return (error);
2219
2220 sx_slock(&allprison_lock);
2221 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2222 if (pr == NULL) {
2223 sx_sunlock(&allprison_lock);
2224 return (EINVAL);
2225 }
2226
2227 /*
2228 * Do not allow a process to attach to a prison that is not
2229 * considered to be "alive".
2230 */
2231 if (pr->pr_uref == 0) {
2232 mtx_unlock(&pr->pr_mtx);
2233 sx_sunlock(&allprison_lock);
2234 return (EINVAL);
2235 }
2236
2237 return (do_jail_attach(td, pr));
2238 }
2239
2240 static int
2241 do_jail_attach(struct thread *td, struct prison *pr)
2242 {
2243 struct prison *ppr;
2244 struct proc *p;
2245 struct ucred *newcred, *oldcred;
2246 int vfslocked, error;
2247
2248 /*
2249 * XXX: Note that there is a slight race here if two threads
2250 * in the same privileged process attempt to attach to two
2251 * different jails at the same time. It is important for
2252 * user processes not to do this, or they might end up with
2253 * a process root from one prison, but attached to the jail
2254 * of another.
2255 */
2256 pr->pr_ref++;
2257 pr->pr_uref++;
2258 mtx_unlock(&pr->pr_mtx);
2259
2260 /* Let modules do whatever they need to prepare for attaching. */
2261 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
2262 if (error) {
2263 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
2264 return (error);
2265 }
2266 sx_sunlock(&allprison_lock);
2267
2268 /*
2269 * Reparent the newly attached process to this jail.
2270 */
2271 ppr = td->td_ucred->cr_prison;
2272 p = td->td_proc;
2273 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
2274 if (error)
2275 goto e_revert_osd;
2276
2277 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
2278 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
2279 if ((error = change_dir(pr->pr_root, td)) != 0)
2280 goto e_unlock;
2281 #ifdef MAC
2282 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
2283 goto e_unlock;
2284 #endif
2285 VOP_UNLOCK(pr->pr_root, 0);
2286 if ((error = change_root(pr->pr_root, td)))
2287 goto e_unlock_giant;
2288 VFS_UNLOCK_GIANT(vfslocked);
2289
2290 newcred = crget();
2291 PROC_LOCK(p);
2292 oldcred = p->p_ucred;
2293 setsugid(p);
2294 crcopy(newcred, oldcred);
2295 newcred->cr_prison = pr;
2296 p->p_ucred = newcred;
2297 PROC_UNLOCK(p);
2298 crfree(oldcred);
2299 prison_deref(ppr, PD_DEREF | PD_DEUREF);
2300 return (0);
2301 e_unlock:
2302 VOP_UNLOCK(pr->pr_root, 0);
2303 e_unlock_giant:
2304 VFS_UNLOCK_GIANT(vfslocked);
2305 e_revert_osd:
2306 /* Tell modules this thread is still in its old jail after all. */
2307 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td);
2308 prison_deref(pr, PD_DEREF | PD_DEUREF);
2309 return (error);
2310 }
2311
2312
2313 /*
2314 * Returns a locked prison instance, or NULL on failure.
2315 */
2316 struct prison *
2317 prison_find(int prid)
2318 {
2319 struct prison *pr;
2320
2321 sx_assert(&allprison_lock, SX_LOCKED);
2322 TAILQ_FOREACH(pr, &allprison, pr_list) {
2323 if (pr->pr_id == prid) {
2324 mtx_lock(&pr->pr_mtx);
2325 if (pr->pr_ref > 0)
2326 return (pr);
2327 mtx_unlock(&pr->pr_mtx);
2328 }
2329 }
2330 return (NULL);
2331 }
2332
2333 /*
2334 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
2335 */
2336 struct prison *
2337 prison_find_child(struct prison *mypr, int prid)
2338 {
2339 struct prison *pr;
2340 int descend;
2341
2342 sx_assert(&allprison_lock, SX_LOCKED);
2343 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2344 if (pr->pr_id == prid) {
2345 mtx_lock(&pr->pr_mtx);
2346 if (pr->pr_ref > 0)
2347 return (pr);
2348 mtx_unlock(&pr->pr_mtx);
2349 }
2350 }
2351 return (NULL);
2352 }
2353
2354 /*
2355 * Look for the name relative to mypr. Returns a locked prison or NULL.
2356 */
2357 struct prison *
2358 prison_find_name(struct prison *mypr, const char *name)
2359 {
2360 struct prison *pr, *deadpr;
2361 size_t mylen;
2362 int descend;
2363
2364 sx_assert(&allprison_lock, SX_LOCKED);
2365 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
2366 again:
2367 deadpr = NULL;
2368 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2369 if (!strcmp(pr->pr_name + mylen, name)) {
2370 mtx_lock(&pr->pr_mtx);
2371 if (pr->pr_ref > 0) {
2372 if (pr->pr_uref > 0)
2373 return (pr);
2374 deadpr = pr;
2375 }
2376 mtx_unlock(&pr->pr_mtx);
2377 }
2378 }
2379 /* There was no valid prison - perhaps there was a dying one. */
2380 if (deadpr != NULL) {
2381 mtx_lock(&deadpr->pr_mtx);
2382 if (deadpr->pr_ref == 0) {
2383 mtx_unlock(&deadpr->pr_mtx);
2384 goto again;
2385 }
2386 }
2387 return (deadpr);
2388 }
2389
2390 /*
2391 * See if a prison has the specific flag set.
2392 */
2393 int
2394 prison_flag(struct ucred *cred, unsigned flag)
2395 {
2396
2397 /* This is an atomic read, so no locking is necessary. */
2398 return (cred->cr_prison->pr_flags & flag);
2399 }
2400
2401 int
2402 prison_allow(struct ucred *cred, unsigned flag)
2403 {
2404
2405 /* This is an atomic read, so no locking is necessary. */
2406 return (cred->cr_prison->pr_allow & flag);
2407 }
2408
2409 /*
2410 * Remove a prison reference. If that was the last reference, remove the
2411 * prison itself - but not in this context in case there are locks held.
2412 */
2413 void
2414 prison_free_locked(struct prison *pr)
2415 {
2416
2417 mtx_assert(&pr->pr_mtx, MA_OWNED);
2418 pr->pr_ref--;
2419 if (pr->pr_ref == 0) {
2420 mtx_unlock(&pr->pr_mtx);
2421 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
2422 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2423 return;
2424 }
2425 mtx_unlock(&pr->pr_mtx);
2426 }
2427
2428 void
2429 prison_free(struct prison *pr)
2430 {
2431
2432 mtx_lock(&pr->pr_mtx);
2433 prison_free_locked(pr);
2434 }
2435
2436 static void
2437 prison_complete(void *context, int pending)
2438 {
2439
2440 prison_deref((struct prison *)context, 0);
2441 }
2442
2443 /*
2444 * Remove a prison reference (usually). This internal version assumes no
2445 * mutexes are held, except perhaps the prison itself. If there are no more
2446 * references, release and delist the prison. On completion, the prison lock
2447 * and the allprison lock are both unlocked.
2448 */
2449 static void
2450 prison_deref(struct prison *pr, int flags)
2451 {
2452 struct prison *ppr, *tpr;
2453 int vfslocked;
2454
2455 if (!(flags & PD_LOCKED))
2456 mtx_lock(&pr->pr_mtx);
2457 for (;;) {
2458 if (flags & PD_DEUREF) {
2459 pr->pr_uref--;
2460 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0"));
2461 }
2462 if (flags & PD_DEREF)
2463 pr->pr_ref--;
2464 /* If the prison still has references, nothing else to do. */
2465 if (pr->pr_ref > 0) {
2466 mtx_unlock(&pr->pr_mtx);
2467 if (flags & PD_LIST_SLOCKED)
2468 sx_sunlock(&allprison_lock);
2469 else if (flags & PD_LIST_XLOCKED)
2470 sx_xunlock(&allprison_lock);
2471 return;
2472 }
2473
2474 mtx_unlock(&pr->pr_mtx);
2475 if (flags & PD_LIST_SLOCKED) {
2476 if (!sx_try_upgrade(&allprison_lock)) {
2477 sx_sunlock(&allprison_lock);
2478 sx_xlock(&allprison_lock);
2479 }
2480 } else if (!(flags & PD_LIST_XLOCKED))
2481 sx_xlock(&allprison_lock);
2482
2483 TAILQ_REMOVE(&allprison, pr, pr_list);
2484 LIST_REMOVE(pr, pr_sibling);
2485 ppr = pr->pr_parent;
2486 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
2487 tpr->pr_childcount--;
2488 sx_xunlock(&allprison_lock);
2489
2490 #ifdef VIMAGE
2491 if (pr->pr_vnet != ppr->pr_vnet)
2492 vnet_destroy(pr->pr_vnet);
2493 #endif
2494 if (pr->pr_root != NULL) {
2495 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
2496 vrele(pr->pr_root);
2497 VFS_UNLOCK_GIANT(vfslocked);
2498 }
2499 mtx_destroy(&pr->pr_mtx);
2500 #ifdef INET
2501 free(pr->pr_ip4, M_PRISON);
2502 #endif
2503 #ifdef INET6
2504 free(pr->pr_ip6, M_PRISON);
2505 #endif
2506 if (pr->pr_cpuset != NULL)
2507 cpuset_rel(pr->pr_cpuset);
2508 osd_jail_exit(pr);
2509 free(pr, M_PRISON);
2510
2511 /* Removing a prison frees a reference on its parent. */
2512 pr = ppr;
2513 mtx_lock(&pr->pr_mtx);
2514 flags = PD_DEREF | PD_DEUREF;
2515 }
2516 }
2517
2518 void
2519 prison_hold_locked(struct prison *pr)
2520 {
2521
2522 mtx_assert(&pr->pr_mtx, MA_OWNED);
2523 KASSERT(pr->pr_ref > 0,
2524 ("Trying to hold dead prison (jid=%d).", pr->pr_id));
2525 pr->pr_ref++;
2526 }
2527
2528 void
2529 prison_hold(struct prison *pr)
2530 {
2531
2532 mtx_lock(&pr->pr_mtx);
2533 prison_hold_locked(pr);
2534 mtx_unlock(&pr->pr_mtx);
2535 }
2536
2537 void
2538 prison_proc_hold(struct prison *pr)
2539 {
2540
2541 mtx_lock(&pr->pr_mtx);
2542 KASSERT(pr->pr_uref > 0,
2543 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
2544 pr->pr_uref++;
2545 mtx_unlock(&pr->pr_mtx);
2546 }
2547
2548 void
2549 prison_proc_free(struct prison *pr)
2550 {
2551
2552 mtx_lock(&pr->pr_mtx);
2553 KASSERT(pr->pr_uref > 0,
2554 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
2555 prison_deref(pr, PD_DEUREF | PD_LOCKED);
2556 }
2557
2558
2559 #ifdef INET
2560 /*
2561 * Restrict a prison's IP address list with its parent's, possibly replacing
2562 * it. Return true if the replacement buffer was used (or would have been).
2563 */
2564 static int
2565 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
2566 {
2567 int ii, ij, used;
2568 struct prison *ppr;
2569
2570 ppr = pr->pr_parent;
2571 if (!(pr->pr_flags & PR_IP4_USER)) {
2572 /* This has no user settings, so just copy the parent's list. */
2573 if (pr->pr_ip4s < ppr->pr_ip4s) {
2574 /*
2575 * There's no room for the parent's list. Use the
2576 * new list buffer, which is assumed to be big enough
2577 * (if it was passed). If there's no buffer, try to
2578 * allocate one.
2579 */
2580 used = 1;
2581 if (newip4 == NULL) {
2582 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
2583 M_PRISON, M_NOWAIT);
2584 if (newip4 != NULL)
2585 used = 0;
2586 }
2587 if (newip4 != NULL) {
2588 bcopy(ppr->pr_ip4, newip4,
2589 ppr->pr_ip4s * sizeof(*newip4));
2590 free(pr->pr_ip4, M_PRISON);
2591 pr->pr_ip4 = newip4;
2592 pr->pr_ip4s = ppr->pr_ip4s;
2593 }
2594 return (used);
2595 }
2596 pr->pr_ip4s = ppr->pr_ip4s;
2597 if (pr->pr_ip4s > 0)
2598 bcopy(ppr->pr_ip4, pr->pr_ip4,
2599 pr->pr_ip4s * sizeof(*newip4));
2600 else if (pr->pr_ip4 != NULL) {
2601 free(pr->pr_ip4, M_PRISON);
2602 pr->pr_ip4 = NULL;
2603 }
2604 } else if (pr->pr_ip4s > 0) {
2605 /* Remove addresses that aren't in the parent. */
2606 for (ij = 0; ij < ppr->pr_ip4s; ij++)
2607 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
2608 break;
2609 if (ij < ppr->pr_ip4s)
2610 ii = 1;
2611 else {
2612 bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
2613 --pr->pr_ip4s * sizeof(*pr->pr_ip4));
2614 ii = 0;
2615 }
2616 for (ij = 1; ii < pr->pr_ip4s; ) {
2617 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
2618 ii++;
2619 continue;
2620 }
2621 switch (ij >= ppr->pr_ip4s ? -1 :
2622 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
2623 case -1:
2624 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
2625 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
2626 break;
2627 case 0:
2628 ii++;
2629 ij++;
2630 break;
2631 case 1:
2632 ij++;
2633 break;
2634 }
2635 }
2636 if (pr->pr_ip4s == 0) {
2637 pr->pr_flags |= PR_IP4_DISABLE;
2638 free(pr->pr_ip4, M_PRISON);
2639 pr->pr_ip4 = NULL;
2640 }
2641 }
2642 return (0);
2643 }
2644
2645 /*
2646 * Pass back primary IPv4 address of this jail.
2647 *
2648 * If not restricted return success but do not alter the address. Caller has
2649 * to make sure to initialize it correctly (e.g. INADDR_ANY).
2650 *
2651 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2652 * Address returned in NBO.
2653 */
2654 int
2655 prison_get_ip4(struct ucred *cred, struct in_addr *ia)
2656 {
2657 struct prison *pr;
2658
2659 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2660 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2661
2662 pr = cred->cr_prison;
2663 if (!(pr->pr_flags & PR_IP4))
2664 return (0);
2665 mtx_lock(&pr->pr_mtx);
2666 if (!(pr->pr_flags & PR_IP4)) {
2667 mtx_unlock(&pr->pr_mtx);
2668 return (0);
2669 }
2670 if (pr->pr_ip4 == NULL) {
2671 mtx_unlock(&pr->pr_mtx);
2672 return (EAFNOSUPPORT);
2673 }
2674
2675 ia->s_addr = pr->pr_ip4[0].s_addr;
2676 mtx_unlock(&pr->pr_mtx);
2677 return (0);
2678 }
2679
2680 /*
2681 * Return 1 if we should do proper source address selection or are not jailed.
2682 * We will return 0 if we should bypass source address selection in favour
2683 * of the primary jail IPv4 address. Only in this case *ia will be updated and
2684 * returned in NBO.
2685 * Return EAFNOSUPPORT, in case this jail does not allow IPv4.
2686 */
2687 int
2688 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
2689 {
2690 struct prison *pr;
2691 struct in_addr lia;
2692 int error;
2693
2694 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2695 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2696
2697 if (!jailed(cred))
2698 return (1);
2699
2700 pr = cred->cr_prison;
2701 if (pr->pr_flags & PR_IP4_SADDRSEL)
2702 return (1);
2703
2704 lia.s_addr = INADDR_ANY;
2705 error = prison_get_ip4(cred, &lia);
2706 if (error)
2707 return (error);
2708 if (lia.s_addr == INADDR_ANY)
2709 return (1);
2710
2711 ia->s_addr = lia.s_addr;
2712 return (0);
2713 }
2714
2715 /*
2716 * Return true if pr1 and pr2 have the same IPv4 address restrictions.
2717 */
2718 int
2719 prison_equal_ip4(struct prison *pr1, struct prison *pr2)
2720 {
2721
2722 if (pr1 == pr2)
2723 return (1);
2724
2725 /*
2726 * No need to lock since the PR_IP4_USER flag can't be altered for
2727 * existing prisons.
2728 */
2729 while (pr1 != &prison0 &&
2730 #ifdef VIMAGE
2731 !(pr1->pr_flags & PR_VNET) &&
2732 #endif
2733 !(pr1->pr_flags & PR_IP4_USER))
2734 pr1 = pr1->pr_parent;
2735 while (pr2 != &prison0 &&
2736 #ifdef VIMAGE
2737 !(pr2->pr_flags & PR_VNET) &&
2738 #endif
2739 !(pr2->pr_flags & PR_IP4_USER))
2740 pr2 = pr2->pr_parent;
2741 return (pr1 == pr2);
2742 }
2743
2744 /*
2745 * Make sure our (source) address is set to something meaningful to this
2746 * jail.
2747 *
2748 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2749 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2750 * doesn't allow IPv4. Address passed in in NBO and returned in NBO.
2751 */
2752 int
2753 prison_local_ip4(struct ucred *cred, struct in_addr *ia)
2754 {
2755 struct prison *pr;
2756 struct in_addr ia0;
2757 int error;
2758
2759 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2760 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2761
2762 pr = cred->cr_prison;
2763 if (!(pr->pr_flags & PR_IP4))
2764 return (0);
2765 mtx_lock(&pr->pr_mtx);
2766 if (!(pr->pr_flags & PR_IP4)) {
2767 mtx_unlock(&pr->pr_mtx);
2768 return (0);
2769 }
2770 if (pr->pr_ip4 == NULL) {
2771 mtx_unlock(&pr->pr_mtx);
2772 return (EAFNOSUPPORT);
2773 }
2774
2775 ia0.s_addr = ntohl(ia->s_addr);
2776 if (ia0.s_addr == INADDR_LOOPBACK) {
2777 ia->s_addr = pr->pr_ip4[0].s_addr;
2778 mtx_unlock(&pr->pr_mtx);
2779 return (0);
2780 }
2781
2782 if (ia0.s_addr == INADDR_ANY) {
2783 /*
2784 * In case there is only 1 IPv4 address, bind directly.
2785 */
2786 if (pr->pr_ip4s == 1)
2787 ia->s_addr = pr->pr_ip4[0].s_addr;
2788 mtx_unlock(&pr->pr_mtx);
2789 return (0);
2790 }
2791
2792 error = _prison_check_ip4(pr, ia);
2793 mtx_unlock(&pr->pr_mtx);
2794 return (error);
2795 }
2796
2797 /*
2798 * Rewrite destination address in case we will connect to loopback address.
2799 *
2800 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2801 * Address passed in in NBO and returned in NBO.
2802 */
2803 int
2804 prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
2805 {
2806 struct prison *pr;
2807
2808 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2809 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2810
2811 pr = cred->cr_prison;
2812 if (!(pr->pr_flags & PR_IP4))
2813 return (0);
2814 mtx_lock(&pr->pr_mtx);
2815 if (!(pr->pr_flags & PR_IP4)) {
2816 mtx_unlock(&pr->pr_mtx);
2817 return (0);
2818 }
2819 if (pr->pr_ip4 == NULL) {
2820 mtx_unlock(&pr->pr_mtx);
2821 return (EAFNOSUPPORT);
2822 }
2823
2824 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) {
2825 ia->s_addr = pr->pr_ip4[0].s_addr;
2826 mtx_unlock(&pr->pr_mtx);
2827 return (0);
2828 }
2829
2830 /*
2831 * Return success because nothing had to be changed.
2832 */
2833 mtx_unlock(&pr->pr_mtx);
2834 return (0);
2835 }
2836
2837 /*
2838 * Check if given address belongs to the jail referenced by cred/prison.
2839 *
2840 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2841 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2842 * doesn't allow IPv4. Address passed in in NBO.
2843 */
2844 static int
2845 _prison_check_ip4(struct prison *pr, struct in_addr *ia)
2846 {
2847 int i, a, z, d;
2848
2849 /*
2850 * Check the primary IP.
2851 */
2852 if (pr->pr_ip4[0].s_addr == ia->s_addr)
2853 return (0);
2854
2855 /*
2856 * All the other IPs are sorted so we can do a binary search.
2857 */
2858 a = 0;
2859 z = pr->pr_ip4s - 2;
2860 while (a <= z) {
2861 i = (a + z) / 2;
2862 d = qcmp_v4(&pr->pr_ip4[i+1], ia);
2863 if (d > 0)
2864 z = i - 1;
2865 else if (d < 0)
2866 a = i + 1;
2867 else
2868 return (0);
2869 }
2870
2871 return (EADDRNOTAVAIL);
2872 }
2873
2874 int
2875 prison_check_ip4(struct ucred *cred, struct in_addr *ia)
2876 {
2877 struct prison *pr;
2878 int error;
2879
2880 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2881 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2882
2883 pr = cred->cr_prison;
2884 if (!(pr->pr_flags & PR_IP4))
2885 return (0);
2886 mtx_lock(&pr->pr_mtx);
2887 if (!(pr->pr_flags & PR_IP4)) {
2888 mtx_unlock(&pr->pr_mtx);
2889 return (0);
2890 }
2891 if (pr->pr_ip4 == NULL) {
2892 mtx_unlock(&pr->pr_mtx);
2893 return (EAFNOSUPPORT);
2894 }
2895
2896 error = _prison_check_ip4(pr, ia);
2897 mtx_unlock(&pr->pr_mtx);
2898 return (error);
2899 }
2900 #endif
2901
2902 #ifdef INET6
2903 static int
2904 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
2905 {
2906 int ii, ij, used;
2907 struct prison *ppr;
2908
2909 ppr = pr->pr_parent;
2910 if (!(pr->pr_flags & PR_IP6_USER)) {
2911 /* This has no user settings, so just copy the parent's list. */
2912 if (pr->pr_ip6s < ppr->pr_ip6s) {
2913 /*
2914 * There's no room for the parent's list. Use the
2915 * new list buffer, which is assumed to be big enough
2916 * (if it was passed). If there's no buffer, try to
2917 * allocate one.
2918 */
2919 used = 1;
2920 if (newip6 == NULL) {
2921 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
2922 M_PRISON, M_NOWAIT);
2923 if (newip6 != NULL)
2924 used = 0;
2925 }
2926 if (newip6 != NULL) {
2927 bcopy(ppr->pr_ip6, newip6,
2928 ppr->pr_ip6s * sizeof(*newip6));
2929 free(pr->pr_ip6, M_PRISON);
2930 pr->pr_ip6 = newip6;
2931 pr->pr_ip6s = ppr->pr_ip6s;
2932 }
2933 return (used);
2934 }
2935 pr->pr_ip6s = ppr->pr_ip6s;
2936 if (pr->pr_ip6s > 0)
2937 bcopy(ppr->pr_ip6, pr->pr_ip6,
2938 pr->pr_ip6s * sizeof(*newip6));
2939 else if (pr->pr_ip6 != NULL) {
2940 free(pr->pr_ip6, M_PRISON);
2941 pr->pr_ip6 = NULL;
2942 }
2943 } else if (pr->pr_ip6s > 0) {
2944 /* Remove addresses that aren't in the parent. */
2945 for (ij = 0; ij < ppr->pr_ip6s; ij++)
2946 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
2947 &ppr->pr_ip6[ij]))
2948 break;
2949 if (ij < ppr->pr_ip6s)
2950 ii = 1;
2951 else {
2952 bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
2953 --pr->pr_ip6s * sizeof(*pr->pr_ip6));
2954 ii = 0;
2955 }
2956 for (ij = 1; ii < pr->pr_ip6s; ) {
2957 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
2958 &ppr->pr_ip6[0])) {
2959 ii++;
2960 continue;
2961 }
2962 switch (ij >= ppr->pr_ip4s ? -1 :
2963 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
2964 case -1:
2965 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
2966 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
2967 break;
2968 case 0:
2969 ii++;
2970 ij++;
2971 break;
2972 case 1:
2973 ij++;
2974 break;
2975 }
2976 }
2977 if (pr->pr_ip6s == 0) {
2978 pr->pr_flags |= PR_IP6_DISABLE;
2979 free(pr->pr_ip6, M_PRISON);
2980 pr->pr_ip6 = NULL;
2981 }
2982 }
2983 return 0;
2984 }
2985
2986 /*
2987 * Pass back primary IPv6 address for this jail.
2988 *
2989 * If not restricted return success but do not alter the address. Caller has
2990 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
2991 *
2992 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
2993 */
2994 int
2995 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
2996 {
2997 struct prison *pr;
2998
2999 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3000 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3001
3002 pr = cred->cr_prison;
3003 if (!(pr->pr_flags & PR_IP6))
3004 return (0);
3005 mtx_lock(&pr->pr_mtx);
3006 if (!(pr->pr_flags & PR_IP6)) {
3007 mtx_unlock(&pr->pr_mtx);
3008 return (0);
3009 }
3010 if (pr->pr_ip6 == NULL) {
3011 mtx_unlock(&pr->pr_mtx);
3012 return (EAFNOSUPPORT);
3013 }
3014
3015 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3016 mtx_unlock(&pr->pr_mtx);
3017 return (0);
3018 }
3019
3020 /*
3021 * Return 1 if we should do proper source address selection or are not jailed.
3022 * We will return 0 if we should bypass source address selection in favour
3023 * of the primary jail IPv6 address. Only in this case *ia will be updated and
3024 * returned in NBO.
3025 * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
3026 */
3027 int
3028 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
3029 {
3030 struct prison *pr;
3031 struct in6_addr lia6;
3032 int error;
3033
3034 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3035 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3036
3037 if (!jailed(cred))
3038 return (1);
3039
3040 pr = cred->cr_prison;
3041 if (pr->pr_flags & PR_IP6_SADDRSEL)
3042 return (1);
3043
3044 lia6 = in6addr_any;
3045 error = prison_get_ip6(cred, &lia6);
3046 if (error)
3047 return (error);
3048 if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
3049 return (1);
3050
3051 bcopy(&lia6, ia6, sizeof(struct in6_addr));
3052 return (0);
3053 }
3054
3055 /*
3056 * Return true if pr1 and pr2 have the same IPv6 address restrictions.
3057 */
3058 int
3059 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
3060 {
3061
3062 if (pr1 == pr2)
3063 return (1);
3064
3065 while (pr1 != &prison0 &&
3066 #ifdef VIMAGE
3067 !(pr1->pr_flags & PR_VNET) &&
3068 #endif
3069 !(pr1->pr_flags & PR_IP6_USER))
3070 pr1 = pr1->pr_parent;
3071 while (pr2 != &prison0 &&
3072 #ifdef VIMAGE
3073 !(pr2->pr_flags & PR_VNET) &&
3074 #endif
3075 !(pr2->pr_flags & PR_IP6_USER))
3076 pr2 = pr2->pr_parent;
3077 return (pr1 == pr2);
3078 }
3079
3080 /*
3081 * Make sure our (source) address is set to something meaningful to this jail.
3082 *
3083 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
3084 * when needed while binding.
3085 *
3086 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3087 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3088 * doesn't allow IPv6.
3089 */
3090 int
3091 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
3092 {
3093 struct prison *pr;
3094 int error;
3095
3096 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3097 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3098
3099 pr = cred->cr_prison;
3100 if (!(pr->pr_flags & PR_IP6))
3101 return (0);
3102 mtx_lock(&pr->pr_mtx);
3103 if (!(pr->pr_flags & PR_IP6)) {
3104 mtx_unlock(&pr->pr_mtx);
3105 return (0);
3106 }
3107 if (pr->pr_ip6 == NULL) {
3108 mtx_unlock(&pr->pr_mtx);
3109 return (EAFNOSUPPORT);
3110 }
3111
3112 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3113 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3114 mtx_unlock(&pr->pr_mtx);
3115 return (0);
3116 }
3117
3118 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
3119 /*
3120 * In case there is only 1 IPv6 address, and v6only is true,
3121 * then bind directly.
3122 */
3123 if (v6only != 0 && pr->pr_ip6s == 1)
3124 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3125 mtx_unlock(&pr->pr_mtx);
3126 return (0);
3127 }
3128
3129 error = _prison_check_ip6(pr, ia6);
3130 mtx_unlock(&pr->pr_mtx);
3131 return (error);
3132 }
3133
3134 /*
3135 * Rewrite destination address in case we will connect to loopback address.
3136 *
3137 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3138 */
3139 int
3140 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
3141 {
3142 struct prison *pr;
3143
3144 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3145 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3146
3147 pr = cred->cr_prison;
3148 if (!(pr->pr_flags & PR_IP6))
3149 return (0);
3150 mtx_lock(&pr->pr_mtx);
3151 if (!(pr->pr_flags & PR_IP6)) {
3152 mtx_unlock(&pr->pr_mtx);
3153 return (0);
3154 }
3155 if (pr->pr_ip6 == NULL) {
3156 mtx_unlock(&pr->pr_mtx);
3157 return (EAFNOSUPPORT);
3158 }
3159
3160 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3161 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3162 mtx_unlock(&pr->pr_mtx);
3163 return (0);
3164 }
3165
3166 /*
3167 * Return success because nothing had to be changed.
3168 */
3169 mtx_unlock(&pr->pr_mtx);
3170 return (0);
3171 }
3172
3173 /*
3174 * Check if given address belongs to the jail referenced by cred/prison.
3175 *
3176 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3177 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3178 * doesn't allow IPv6.
3179 */
3180 static int
3181 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6)
3182 {
3183 int i, a, z, d;
3184
3185 /*
3186 * Check the primary IP.
3187 */
3188 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
3189 return (0);
3190
3191 /*
3192 * All the other IPs are sorted so we can do a binary search.
3193 */
3194 a = 0;
3195 z = pr->pr_ip6s - 2;
3196 while (a <= z) {
3197 i = (a + z) / 2;
3198 d = qcmp_v6(&pr->pr_ip6[i+1], ia6);
3199 if (d > 0)
3200 z = i - 1;
3201 else if (d < 0)
3202 a = i + 1;
3203 else
3204 return (0);
3205 }
3206
3207 return (EADDRNOTAVAIL);
3208 }
3209
3210 int
3211 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6)
3212 {
3213 struct prison *pr;
3214 int error;
3215
3216 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3217 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3218
3219 pr = cred->cr_prison;
3220 if (!(pr->pr_flags & PR_IP6))
3221 return (0);
3222 mtx_lock(&pr->pr_mtx);
3223 if (!(pr->pr_flags & PR_IP6)) {
3224 mtx_unlock(&pr->pr_mtx);
3225 return (0);
3226 }
3227 if (pr->pr_ip6 == NULL) {
3228 mtx_unlock(&pr->pr_mtx);
3229 return (EAFNOSUPPORT);
3230 }
3231
3232 error = _prison_check_ip6(pr, ia6);
3233 mtx_unlock(&pr->pr_mtx);
3234 return (error);
3235 }
3236 #endif
3237
3238 /*
3239 * Check if a jail supports the given address family.
3240 *
3241 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
3242 * if not.
3243 */
3244 int
3245 prison_check_af(struct ucred *cred, int af)
3246 {
3247 struct prison *pr;
3248 int error;
3249
3250 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3251
3252 pr = cred->cr_prison;
3253 #ifdef VIMAGE
3254 /* Prisons with their own network stack are not limited. */
3255 if (prison_owns_vnet(cred))
3256 return (0);
3257 #endif
3258
3259 error = 0;
3260 switch (af)
3261 {
3262 #ifdef INET
3263 case AF_INET:
3264 if (pr->pr_flags & PR_IP4)
3265 {
3266 mtx_lock(&pr->pr_mtx);
3267 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
3268 error = EAFNOSUPPORT;
3269 mtx_unlock(&pr->pr_mtx);
3270 }
3271 break;
3272 #endif
3273 #ifdef INET6
3274 case AF_INET6:
3275 if (pr->pr_flags & PR_IP6)
3276 {
3277 mtx_lock(&pr->pr_mtx);
3278 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
3279 error = EAFNOSUPPORT;
3280 mtx_unlock(&pr->pr_mtx);
3281 }
3282 break;
3283 #endif
3284 case AF_LOCAL:
3285 case AF_ROUTE:
3286 break;
3287 default:
3288 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
3289 error = EAFNOSUPPORT;
3290 }
3291 return (error);
3292 }
3293
3294 /*
3295 * Check if given address belongs to the jail referenced by cred (wrapper to
3296 * prison_check_ip[46]).
3297 *
3298 * Returns 0 if jail doesn't restrict the address family or if address belongs
3299 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
3300 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
3301 */
3302 int
3303 prison_if(struct ucred *cred, struct sockaddr *sa)
3304 {
3305 #ifdef INET
3306 struct sockaddr_in *sai;
3307 #endif
3308 #ifdef INET6
3309 struct sockaddr_in6 *sai6;
3310 #endif
3311 int error;
3312
3313 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3314 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
3315
3316 #ifdef VIMAGE
3317 if (prison_owns_vnet(cred))
3318 return (0);
3319 #endif
3320
3321 error = 0;
3322 switch (sa->sa_family)
3323 {
3324 #ifdef INET
3325 case AF_INET:
3326 sai = (struct sockaddr_in *)sa;
3327 error = prison_check_ip4(cred, &sai->sin_addr);
3328 break;
3329 #endif
3330 #ifdef INET6
3331 case AF_INET6:
3332 sai6 = (struct sockaddr_in6 *)sa;
3333 error = prison_check_ip6(cred, &sai6->sin6_addr);
3334 break;
3335 #endif
3336 default:
3337 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
3338 error = EAFNOSUPPORT;
3339 }
3340 return (error);
3341 }
3342
3343 /*
3344 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
3345 */
3346 int
3347 prison_check(struct ucred *cred1, struct ucred *cred2)
3348 {
3349
3350 return ((cred1->cr_prison == cred2->cr_prison ||
3351 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
3352 }
3353
3354 /*
3355 * Return 1 if p2 is a child of p1, otherwise 0.
3356 */
3357 int
3358 prison_ischild(struct prison *pr1, struct prison *pr2)
3359 {
3360
3361 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
3362 if (pr1 == pr2)
3363 return (1);
3364 return (0);
3365 }
3366
3367 /*
3368 * Return 1 if the passed credential is in a jail, otherwise 0.
3369 */
3370 int
3371 jailed(struct ucred *cred)
3372 {
3373
3374 return (cred->cr_prison != &prison0);
3375 }
3376
3377 /*
3378 * Return 1 if the passed credential is in a jail and that jail does not
3379 * have its own virtual network stack, otherwise 0.
3380 */
3381 int
3382 jailed_without_vnet(struct ucred *cred)
3383 {
3384
3385 if (!jailed(cred))
3386 return (0);
3387 #ifdef VIMAGE
3388 if (prison_owns_vnet(cred))
3389 return (0);
3390 #endif
3391
3392 return (1);
3393 }
3394
3395 /*
3396 * Return the correct hostname (domainname, et al) for the passed credential.
3397 */
3398 void
3399 getcredhostname(struct ucred *cred, char *buf, size_t size)
3400 {
3401 struct prison *pr;
3402
3403 /*
3404 * A NULL credential can be used to shortcut to the physical
3405 * system's hostname.
3406 */
3407 pr = (cred != NULL) ? cred->cr_prison : &prison0;
3408 mtx_lock(&pr->pr_mtx);
3409 strlcpy(buf, pr->pr_hostname, size);
3410 mtx_unlock(&pr->pr_mtx);
3411 }
3412
3413 void
3414 getcreddomainname(struct ucred *cred, char *buf, size_t size)
3415 {
3416
3417 mtx_lock(&cred->cr_prison->pr_mtx);
3418 strlcpy(buf, cred->cr_prison->pr_domainname, size);
3419 mtx_unlock(&cred->cr_prison->pr_mtx);
3420 }
3421
3422 void
3423 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
3424 {
3425
3426 mtx_lock(&cred->cr_prison->pr_mtx);
3427 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
3428 mtx_unlock(&cred->cr_prison->pr_mtx);
3429 }
3430
3431 void
3432 getcredhostid(struct ucred *cred, unsigned long *hostid)
3433 {
3434
3435 mtx_lock(&cred->cr_prison->pr_mtx);
3436 *hostid = cred->cr_prison->pr_hostid;
3437 mtx_unlock(&cred->cr_prison->pr_mtx);
3438 }
3439
3440 #ifdef VIMAGE
3441 /*
3442 * Determine whether the prison represented by cred owns
3443 * its vnet rather than having it inherited.
3444 *
3445 * Returns 1 in case the prison owns the vnet, 0 otherwise.
3446 */
3447 int
3448 prison_owns_vnet(struct ucred *cred)
3449 {
3450
3451 /*
3452 * vnets cannot be added/removed after jail creation,
3453 * so no need to lock here.
3454 */
3455 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
3456 }
3457 #endif
3458
3459 /*
3460 * Determine whether the subject represented by cred can "see"
3461 * status of a mount point.
3462 * Returns: 0 for permitted, ENOENT otherwise.
3463 * XXX: This function should be called cr_canseemount() and should be
3464 * placed in kern_prot.c.
3465 */
3466 int
3467 prison_canseemount(struct ucred *cred, struct mount *mp)
3468 {
3469 struct prison *pr;
3470 struct statfs *sp;
3471 size_t len;
3472
3473 pr = cred->cr_prison;
3474 if (pr->pr_enforce_statfs == 0)
3475 return (0);
3476 if (pr->pr_root->v_mount == mp)
3477 return (0);
3478 if (pr->pr_enforce_statfs == 2)
3479 return (ENOENT);
3480 /*
3481 * If jail's chroot directory is set to "/" we should be able to see
3482 * all mount-points from inside a jail.
3483 * This is ugly check, but this is the only situation when jail's
3484 * directory ends with '/'.
3485 */
3486 if (strcmp(pr->pr_path, "/") == 0)
3487 return (0);
3488 len = strlen(pr->pr_path);
3489 sp = &mp->mnt_stat;
3490 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
3491 return (ENOENT);
3492 /*
3493 * Be sure that we don't have situation where jail's root directory
3494 * is "/some/path" and mount point is "/some/pathpath".
3495 */
3496 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
3497 return (ENOENT);
3498 return (0);
3499 }
3500
3501 void
3502 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
3503 {
3504 char jpath[MAXPATHLEN];
3505 struct prison *pr;
3506 size_t len;
3507
3508 pr = cred->cr_prison;
3509 if (pr->pr_enforce_statfs == 0)
3510 return;
3511 if (prison_canseemount(cred, mp) != 0) {
3512 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3513 strlcpy(sp->f_mntonname, "[restricted]",
3514 sizeof(sp->f_mntonname));
3515 return;
3516 }
3517 if (pr->pr_root->v_mount == mp) {
3518 /*
3519 * Clear current buffer data, so we are sure nothing from
3520 * the valid path left there.
3521 */
3522 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3523 *sp->f_mntonname = '/';
3524 return;
3525 }
3526 /*
3527 * If jail's chroot directory is set to "/" we should be able to see
3528 * all mount-points from inside a jail.
3529 */
3530 if (strcmp(pr->pr_path, "/") == 0)
3531 return;
3532 len = strlen(pr->pr_path);
3533 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
3534 /*
3535 * Clear current buffer data, so we are sure nothing from
3536 * the valid path left there.
3537 */
3538 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3539 if (*jpath == '\0') {
3540 /* Should never happen. */
3541 *sp->f_mntonname = '/';
3542 } else {
3543 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
3544 }
3545 }
3546
3547 /*
3548 * Check with permission for a specific privilege is granted within jail. We
3549 * have a specific list of accepted privileges; the rest are denied.
3550 */
3551 int
3552 prison_priv_check(struct ucred *cred, int priv)
3553 {
3554
3555 if (!jailed(cred))
3556 return (0);
3557
3558 #ifdef VIMAGE
3559 /*
3560 * Privileges specific to prisons with a virtual network stack.
3561 * There might be a duplicate entry here in case the privilege
3562 * is only granted conditionally in the legacy jail case.
3563 */
3564 switch (priv) {
3565 #ifdef notyet
3566 /*
3567 * NFS-specific privileges.
3568 */
3569 case PRIV_NFS_DAEMON:
3570 case PRIV_NFS_LOCKD:
3571 #endif
3572 /*
3573 * Network stack privileges.
3574 */
3575 case PRIV_NET_BRIDGE:
3576 case PRIV_NET_GRE:
3577 case PRIV_NET_BPF:
3578 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
3579 case PRIV_NET_ROUTE:
3580 case PRIV_NET_TAP:
3581 case PRIV_NET_SETIFMTU:
3582 case PRIV_NET_SETIFFLAGS:
3583 case PRIV_NET_SETIFCAP:
3584 case PRIV_NET_SETIFDESCR:
3585 case PRIV_NET_SETIFNAME :
3586 case PRIV_NET_SETIFMETRIC:
3587 case PRIV_NET_SETIFPHYS:
3588 case PRIV_NET_SETIFMAC:
3589 case PRIV_NET_ADDMULTI:
3590 case PRIV_NET_DELMULTI:
3591 case PRIV_NET_HWIOCTL:
3592 case PRIV_NET_SETLLADDR:
3593 case PRIV_NET_ADDIFGROUP:
3594 case PRIV_NET_DELIFGROUP:
3595 case PRIV_NET_IFCREATE:
3596 case PRIV_NET_IFDESTROY:
3597 case PRIV_NET_ADDIFADDR:
3598 case PRIV_NET_DELIFADDR:
3599 case PRIV_NET_LAGG:
3600 case PRIV_NET_GIF:
3601 case PRIV_NET_SETIFVNET:
3602 case PRIV_NET_SETIFFIB:
3603
3604 /*
3605 * 802.11-related privileges.
3606 */
3607 case PRIV_NET80211_GETKEY:
3608 #ifdef notyet
3609 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */
3610 #endif
3611
3612 #ifdef notyet
3613 /*
3614 * AppleTalk privileges.
3615 */
3616 case PRIV_NETATALK_RESERVEDPORT:
3617
3618 /*
3619 * ATM privileges.
3620 */
3621 case PRIV_NETATM_CFG:
3622 case PRIV_NETATM_ADD:
3623 case PRIV_NETATM_DEL:
3624 case PRIV_NETATM_SET:
3625
3626 /*
3627 * Bluetooth privileges.
3628 */
3629 case PRIV_NETBLUETOOTH_RAW:
3630 #endif
3631
3632 /*
3633 * Netgraph and netgraph module privileges.
3634 */
3635 case PRIV_NETGRAPH_CONTROL:
3636 #ifdef notyet
3637 case PRIV_NETGRAPH_TTY:
3638 #endif
3639
3640 /*
3641 * IPv4 and IPv6 privileges.
3642 */
3643 case PRIV_NETINET_IPFW:
3644 case PRIV_NETINET_DIVERT:
3645 case PRIV_NETINET_PF:
3646 case PRIV_NETINET_DUMMYNET:
3647 case PRIV_NETINET_CARP:
3648 case PRIV_NETINET_MROUTE:
3649 case PRIV_NETINET_RAW:
3650 case PRIV_NETINET_ADDRCTRL6:
3651 case PRIV_NETINET_ND6:
3652 case PRIV_NETINET_SCOPE6:
3653 case PRIV_NETINET_ALIFETIME6:
3654 case PRIV_NETINET_IPSEC:
3655 case PRIV_NETINET_BINDANY:
3656
3657 #ifdef notyet
3658 /*
3659 * IPX/SPX privileges.
3660 */
3661 case PRIV_NETIPX_RESERVEDPORT:
3662 case PRIV_NETIPX_RAW:
3663
3664 /*
3665 * NCP privileges.
3666 */
3667 case PRIV_NETNCP:
3668
3669 /*
3670 * SMB privileges.
3671 */
3672 case PRIV_NETSMB:
3673 #endif
3674
3675 /*
3676 * No default: or deny here.
3677 * In case of no permit fall through to next switch().
3678 */
3679 if (cred->cr_prison->pr_flags & PR_VNET)
3680 return (0);
3681 }
3682 #endif /* VIMAGE */
3683
3684 switch (priv) {
3685
3686 /*
3687 * Allow ktrace privileges for root in jail.
3688 */
3689 case PRIV_KTRACE:
3690
3691 #if 0
3692 /*
3693 * Allow jailed processes to configure audit identity and
3694 * submit audit records (login, etc). In the future we may
3695 * want to further refine the relationship between audit and
3696 * jail.
3697 */
3698 case PRIV_AUDIT_GETAUDIT:
3699 case PRIV_AUDIT_SETAUDIT:
3700 case PRIV_AUDIT_SUBMIT:
3701 #endif
3702
3703 /*
3704 * Allow jailed processes to manipulate process UNIX
3705 * credentials in any way they see fit.
3706 */
3707 case PRIV_CRED_SETUID:
3708 case PRIV_CRED_SETEUID:
3709 case PRIV_CRED_SETGID:
3710 case PRIV_CRED_SETEGID:
3711 case PRIV_CRED_SETGROUPS:
3712 case PRIV_CRED_SETREUID:
3713 case PRIV_CRED_SETREGID:
3714 case PRIV_CRED_SETRESUID:
3715 case PRIV_CRED_SETRESGID:
3716
3717 /*
3718 * Jail implements visibility constraints already, so allow
3719 * jailed root to override uid/gid-based constraints.
3720 */
3721 case PRIV_SEEOTHERGIDS:
3722 case PRIV_SEEOTHERUIDS:
3723
3724 /*
3725 * Jail implements inter-process debugging limits already, so
3726 * allow jailed root various debugging privileges.
3727 */
3728 case PRIV_DEBUG_DIFFCRED:
3729 case PRIV_DEBUG_SUGID:
3730 case PRIV_DEBUG_UNPRIV:
3731
3732 /*
3733 * Allow jail to set various resource limits and login
3734 * properties, and for now, exceed process resource limits.
3735 */
3736 case PRIV_PROC_LIMIT:
3737 case PRIV_PROC_SETLOGIN:
3738 case PRIV_PROC_SETRLIMIT:
3739
3740 /*
3741 * System V and POSIX IPC privileges are granted in jail.
3742 */
3743 case PRIV_IPC_READ:
3744 case PRIV_IPC_WRITE:
3745 case PRIV_IPC_ADMIN:
3746 case PRIV_IPC_MSGSIZE:
3747 case PRIV_MQ_ADMIN:
3748
3749 /*
3750 * Jail operations within a jail work on child jails.
3751 */
3752 case PRIV_JAIL_ATTACH:
3753 case PRIV_JAIL_SET:
3754 case PRIV_JAIL_REMOVE:
3755
3756 /*
3757 * Jail implements its own inter-process limits, so allow
3758 * root processes in jail to change scheduling on other
3759 * processes in the same jail. Likewise for signalling.
3760 */
3761 case PRIV_SCHED_DIFFCRED:
3762 case PRIV_SCHED_CPUSET:
3763 case PRIV_SIGNAL_DIFFCRED:
3764 case PRIV_SIGNAL_SUGID:
3765
3766 /*
3767 * Allow jailed processes to write to sysctls marked as jail
3768 * writable.
3769 */
3770 case PRIV_SYSCTL_WRITEJAIL:
3771
3772 /*
3773 * Allow root in jail to manage a variety of quota
3774 * properties. These should likely be conditional on a
3775 * configuration option.
3776 */
3777 case PRIV_VFS_GETQUOTA:
3778 case PRIV_VFS_SETQUOTA:
3779
3780 /*
3781 * Since Jail relies on chroot() to implement file system
3782 * protections, grant many VFS privileges to root in jail.
3783 * Be careful to exclude mount-related and NFS-related
3784 * privileges.
3785 */
3786 case PRIV_VFS_READ:
3787 case PRIV_VFS_WRITE:
3788 case PRIV_VFS_ADMIN:
3789 case PRIV_VFS_EXEC:
3790 case PRIV_VFS_LOOKUP:
3791 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
3792 case PRIV_VFS_CHFLAGS_DEV:
3793 case PRIV_VFS_CHOWN:
3794 case PRIV_VFS_CHROOT:
3795 case PRIV_VFS_RETAINSUGID:
3796 case PRIV_VFS_FCHROOT:
3797 case PRIV_VFS_LINK:
3798 case PRIV_VFS_SETGID:
3799 case PRIV_VFS_STAT:
3800 case PRIV_VFS_STICKYFILE:
3801 return (0);
3802
3803 /*
3804 * Depending on the global setting, allow privilege of
3805 * setting system flags.
3806 */
3807 case PRIV_VFS_SYSFLAGS:
3808 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
3809 return (0);
3810 else
3811 return (EPERM);
3812
3813 /*
3814 * Depending on the global setting, allow privilege of
3815 * mounting/unmounting file systems.
3816 */
3817 case PRIV_VFS_MOUNT:
3818 case PRIV_VFS_UNMOUNT:
3819 case PRIV_VFS_MOUNT_NONUSER:
3820 case PRIV_VFS_MOUNT_OWNER:
3821 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT)
3822 return (0);
3823 else
3824 return (EPERM);
3825
3826 /*
3827 * Allow jailed root to bind reserved ports and reuse in-use
3828 * ports.
3829 */
3830 case PRIV_NETINET_RESERVEDPORT:
3831 case PRIV_NETINET_REUSEPORT:
3832 return (0);
3833
3834 /*
3835 * Allow jailed root to set certian IPv4/6 (option) headers.
3836 */
3837 case PRIV_NETINET_SETHDROPTS:
3838 return (0);
3839
3840 /*
3841 * Conditionally allow creating raw sockets in jail.
3842 */
3843 case PRIV_NETINET_RAW:
3844 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
3845 return (0);
3846 else
3847 return (EPERM);
3848
3849 /*
3850 * Since jail implements its own visibility limits on netstat
3851 * sysctls, allow getcred. This allows identd to work in
3852 * jail.
3853 */
3854 case PRIV_NETINET_GETCRED:
3855 return (0);
3856
3857 default:
3858 /*
3859 * In all remaining cases, deny the privilege request. This
3860 * includes almost all network privileges, many system
3861 * configuration privileges.
3862 */
3863 return (EPERM);
3864 }
3865 }
3866
3867 /*
3868 * Return the part of pr2's name that is relative to pr1, or the whole name
3869 * if it does not directly follow.
3870 */
3871
3872 char *
3873 prison_name(struct prison *pr1, struct prison *pr2)
3874 {
3875 char *name;
3876
3877 /* Jails see themselves as "" (if they see themselves at all). */
3878 if (pr1 == pr2)
3879 return "";
3880 name = pr2->pr_name;
3881 if (prison_ischild(pr1, pr2)) {
3882 /*
3883 * pr1 isn't locked (and allprison_lock may not be either)
3884 * so its length can't be counted on. But the number of dots
3885 * can be counted on - and counted.
3886 */
3887 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
3888 name = strchr(name, '.') + 1;
3889 }
3890 return (name);
3891 }
3892
3893 /*
3894 * Return the part of pr2's path that is relative to pr1, or the whole path
3895 * if it does not directly follow.
3896 */
3897 static char *
3898 prison_path(struct prison *pr1, struct prison *pr2)
3899 {
3900 char *path1, *path2;
3901 int len1;
3902
3903 path1 = pr1->pr_path;
3904 path2 = pr2->pr_path;
3905 if (!strcmp(path1, "/"))
3906 return (path2);
3907 len1 = strlen(path1);
3908 if (strncmp(path1, path2, len1))
3909 return (path2);
3910 if (path2[len1] == '\0')
3911 return "/";
3912 if (path2[len1] == '/')
3913 return (path2 + len1);
3914 return (path2);
3915 }
3916
3917
3918 /*
3919 * Jail-related sysctls.
3920 */
3921 SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
3922 "Jails");
3923
3924 static int
3925 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
3926 {
3927 struct xprison *xp;
3928 struct prison *pr, *cpr;
3929 #ifdef INET
3930 struct in_addr *ip4 = NULL;
3931 int ip4s = 0;
3932 #endif
3933 #ifdef INET6
3934 struct in_addr *ip6 = NULL;
3935 int ip6s = 0;
3936 #endif
3937 int descend, error;
3938
3939 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
3940 pr = req->td->td_ucred->cr_prison;
3941 error = 0;
3942 sx_slock(&allprison_lock);
3943 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
3944 #if defined(INET) || defined(INET6)
3945 again:
3946 #endif
3947 mtx_lock(&cpr->pr_mtx);
3948 #ifdef INET
3949 if (cpr->pr_ip4s > 0) {
3950 if (ip4s < cpr->pr_ip4s) {
3951 ip4s = cpr->pr_ip4s;
3952 mtx_unlock(&cpr->pr_mtx);
3953 ip4 = realloc(ip4, ip4s *
3954 sizeof(struct in_addr), M_TEMP, M_WAITOK);
3955 goto again;
3956 }
3957 bcopy(cpr->pr_ip4, ip4,
3958 cpr->pr_ip4s * sizeof(struct in_addr));
3959 }
3960 #endif
3961 #ifdef INET6
3962 if (cpr->pr_ip6s > 0) {
3963 if (ip6s < cpr->pr_ip6s) {
3964 ip6s = cpr->pr_ip6s;
3965 mtx_unlock(&cpr->pr_mtx);
3966 ip6 = realloc(ip6, ip6s *
3967 sizeof(struct in6_addr), M_TEMP, M_WAITOK);
3968 goto again;
3969 }
3970 bcopy(cpr->pr_ip6, ip6,
3971 cpr->pr_ip6s * sizeof(struct in6_addr));
3972 }
3973 #endif
3974 if (cpr->pr_ref == 0) {
3975 mtx_unlock(&cpr->pr_mtx);
3976 continue;
3977 }
3978 bzero(xp, sizeof(*xp));
3979 xp->pr_version = XPRISON_VERSION;
3980 xp->pr_id = cpr->pr_id;
3981 xp->pr_state = cpr->pr_uref > 0
3982 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
3983 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
3984 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
3985 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
3986 #ifdef INET
3987 xp->pr_ip4s = cpr->pr_ip4s;
3988 #endif
3989 #ifdef INET6
3990 xp->pr_ip6s = cpr->pr_ip6s;
3991 #endif
3992 mtx_unlock(&cpr->pr_mtx);
3993 error = SYSCTL_OUT(req, xp, sizeof(*xp));
3994 if (error)
3995 break;
3996 #ifdef INET
3997 if (xp->pr_ip4s > 0) {
3998 error = SYSCTL_OUT(req, ip4,
3999 xp->pr_ip4s * sizeof(struct in_addr));
4000 if (error)
4001 break;
4002 }
4003 #endif
4004 #ifdef INET6
4005 if (xp->pr_ip6s > 0) {
4006 error = SYSCTL_OUT(req, ip6,
4007 xp->pr_ip6s * sizeof(struct in6_addr));
4008 if (error)
4009 break;
4010 }
4011 #endif
4012 }
4013 sx_sunlock(&allprison_lock);
4014 free(xp, M_TEMP);
4015 #ifdef INET
4016 free(ip4, M_TEMP);
4017 #endif
4018 #ifdef INET6
4019 free(ip6, M_TEMP);
4020 #endif
4021 return (error);
4022 }
4023
4024 SYSCTL_OID(_security_jail, OID_AUTO, list,
4025 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4026 sysctl_jail_list, "S", "List of active jails");
4027
4028 static int
4029 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
4030 {
4031 int error, injail;
4032
4033 injail = jailed(req->td->td_ucred);
4034 error = SYSCTL_OUT(req, &injail, sizeof(injail));
4035
4036 return (error);
4037 }
4038
4039 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
4040 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4041 sysctl_jail_jailed, "I", "Process in jail?");
4042
4043 #if defined(INET) || defined(INET6)
4044 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
4045 &jail_max_af_ips, 0,
4046 "Number of IP addresses a jail may have at most per address family");
4047 #endif
4048
4049 /*
4050 * Default parameters for jail(2) compatability. For historical reasons,
4051 * the sysctl names have varying similarity to the parameter names. Prisons
4052 * just see their own parameters, and can't change them.
4053 */
4054 static int
4055 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
4056 {
4057 struct prison *pr;
4058 int allow, error, i;
4059
4060 pr = req->td->td_ucred->cr_prison;
4061 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
4062
4063 /* Get the current flag value, and convert it to a boolean. */
4064 i = (allow & arg2) ? 1 : 0;
4065 if (arg1 != NULL)
4066 i = !i;
4067 error = sysctl_handle_int(oidp, &i, 0, req);
4068 if (error || !req->newptr)
4069 return (error);
4070 i = i ? arg2 : 0;
4071 if (arg1 != NULL)
4072 i ^= arg2;
4073 /*
4074 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
4075 * for writing.
4076 */
4077 mtx_lock(&prison0.pr_mtx);
4078 jail_default_allow = (jail_default_allow & ~arg2) | i;
4079 mtx_unlock(&prison0.pr_mtx);
4080 return (0);
4081 }
4082
4083 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
4084 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4085 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
4086 "Processes in jail can set their hostnames");
4087 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
4088 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4089 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
4090 "Processes in jail are limited to creating UNIX/IP/route sockets only");
4091 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
4092 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4093 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
4094 "Processes in jail can use System V IPC primitives");
4095 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
4096 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4097 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
4098 "Prison root can create raw sockets");
4099 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
4100 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4101 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
4102 "Processes in jail can alter system file flags");
4103 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
4104 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4105 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
4106 "Processes in jail can mount/unmount jail-friendly file systems");
4107
4108 static int
4109 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
4110 {
4111 struct prison *pr;
4112 int level, error;
4113
4114 pr = req->td->td_ucred->cr_prison;
4115 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
4116 error = sysctl_handle_int(oidp, &level, 0, req);
4117 if (error || !req->newptr)
4118 return (error);
4119 *(int *)arg1 = level;
4120 return (0);
4121 }
4122
4123 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
4124 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4125 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
4126 sysctl_jail_default_level, "I",
4127 "Processes in jail cannot see all mounted file systems");
4128
4129 /*
4130 * Nodes to describe jail parameters. Maximum length of string parameters
4131 * is returned in the string itself, and the other parameters exist merely
4132 * to make themselves and their types known.
4133 */
4134 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0,
4135 "Jail parameters");
4136
4137 int
4138 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
4139 {
4140 int i;
4141 long l;
4142 size_t s;
4143 char numbuf[12];
4144
4145 switch (oidp->oid_kind & CTLTYPE)
4146 {
4147 case CTLTYPE_LONG:
4148 case CTLTYPE_ULONG:
4149 l = 0;
4150 #ifdef SCTL_MASK32
4151 if (!(req->flags & SCTL_MASK32))
4152 #endif
4153 return (SYSCTL_OUT(req, &l, sizeof(l)));
4154 case CTLTYPE_INT:
4155 case CTLTYPE_UINT:
4156 i = 0;
4157 return (SYSCTL_OUT(req, &i, sizeof(i)));
4158 case CTLTYPE_STRING:
4159 snprintf(numbuf, sizeof(numbuf), "%d", arg2);
4160 return
4161 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
4162 case CTLTYPE_STRUCT:
4163 s = (size_t)arg2;
4164 return (SYSCTL_OUT(req, &s, sizeof(s)));
4165 }
4166 return (0);
4167 }
4168
4169 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
4170 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
4171 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
4172 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
4173 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
4174 "I", "Jail secure level");
4175 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
4176 "I", "Jail cannot see all mounted file systems");
4177 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
4178 "B", "Jail persistence");
4179 #ifdef VIMAGE
4180 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
4181 "E,jailsys", "Virtual network stack");
4182 #endif
4183 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
4184 "B", "Jail is in the process of shutting down");
4185
4186 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
4187 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
4188 "I", "Current number of child jails");
4189 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
4190 "I", "Maximum number of child jails");
4191
4192 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
4193 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
4194 "Jail hostname");
4195 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
4196 "Jail NIS domainname");
4197 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
4198 "Jail host UUID");
4199 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
4200 "LU", "Jail host ID");
4201
4202 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
4203 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
4204
4205 #ifdef INET
4206 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
4207 "Jail IPv4 address virtualization");
4208 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
4209 "S,in_addr,a", "Jail IPv4 addresses");
4210 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4211 "B", "Do (not) use IPv4 source address selection rather than the "
4212 "primary jail IPv4 address.");
4213 #endif
4214 #ifdef INET6
4215 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
4216 "Jail IPv6 address virtualization");
4217 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
4218 "S,in6_addr,a", "Jail IPv6 addresses");
4219 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4220 "B", "Do (not) use IPv6 source address selection rather than the "
4221 "primary jail IPv6 address.");
4222 #endif
4223
4224 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
4225 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
4226 "B", "Jail may set hostname");
4227 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
4228 "B", "Jail may use SYSV IPC");
4229 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
4230 "B", "Jail may create raw sockets");
4231 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
4232 "B", "Jail may alter system file flags");
4233 SYSCTL_JAIL_PARAM(_allow, mount, CTLTYPE_INT | CTLFLAG_RW,
4234 "B", "Jail may mount/unmount jail-friendly file systems");
4235 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
4236 "B", "Jail may set file quotas");
4237 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
4238 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
4239
4240
4241 #ifdef DDB
4242
4243 static void
4244 db_show_prison(struct prison *pr)
4245 {
4246 int fi;
4247 #if defined(INET) || defined(INET6)
4248 int ii;
4249 #endif
4250 unsigned jsf;
4251 #ifdef INET6
4252 char ip6buf[INET6_ADDRSTRLEN];
4253 #endif
4254
4255 db_printf("prison %p:\n", pr);
4256 db_printf(" jid = %d\n", pr->pr_id);
4257 db_printf(" name = %s\n", pr->pr_name);
4258 db_printf(" parent = %p\n", pr->pr_parent);
4259 db_printf(" ref = %d\n", pr->pr_ref);
4260 db_printf(" uref = %d\n", pr->pr_uref);
4261 db_printf(" path = %s\n", pr->pr_path);
4262 db_printf(" cpuset = %d\n", pr->pr_cpuset
4263 ? pr->pr_cpuset->cs_id : -1);
4264 #ifdef VIMAGE
4265 db_printf(" vnet = %p\n", pr->pr_vnet);
4266 #endif
4267 db_printf(" root = %p\n", pr->pr_root);
4268 db_printf(" securelevel = %d\n", pr->pr_securelevel);
4269 db_printf(" children.max = %d\n", pr->pr_childmax);
4270 db_printf(" children.cur = %d\n", pr->pr_childcount);
4271 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
4272 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
4273 db_printf(" flags = 0x%x", pr->pr_flags);
4274 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
4275 fi++)
4276 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi)))
4277 db_printf(" %s", pr_flag_names[fi]);
4278 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
4279 fi++) {
4280 jsf = pr->pr_flags &
4281 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
4282 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name,
4283 pr_flag_jailsys[fi].disable &&
4284 (jsf == pr_flag_jailsys[fi].disable) ? "disable"
4285 : (jsf == pr_flag_jailsys[fi].new) ? "new"
4286 : "inherit");
4287 }
4288 db_printf(" allow = 0x%x", pr->pr_allow);
4289 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
4290 fi++)
4291 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi)))
4292 db_printf(" %s", pr_allow_names[fi]);
4293 db_printf("\n");
4294 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
4295 db_printf(" host.hostname = %s\n", pr->pr_hostname);
4296 db_printf(" host.domainname = %s\n", pr->pr_domainname);
4297 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
4298 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
4299 #ifdef INET
4300 db_printf(" ip4s = %d\n", pr->pr_ip4s);
4301 for (ii = 0; ii < pr->pr_ip4s; ii++)
4302 db_printf(" %s %s\n",
4303 ii == 0 ? "ip4.addr =" : " ",
4304 inet_ntoa(pr->pr_ip4[ii]));
4305 #endif
4306 #ifdef INET6
4307 db_printf(" ip6s = %d\n", pr->pr_ip6s);
4308 for (ii = 0; ii < pr->pr_ip6s; ii++)
4309 db_printf(" %s %s\n",
4310 ii == 0 ? "ip6.addr =" : " ",
4311 ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
4312 #endif
4313 }
4314
4315 DB_SHOW_COMMAND(prison, db_show_prison_command)
4316 {
4317 struct prison *pr;
4318
4319 if (!have_addr) {
4320 /*
4321 * Show all prisons in the list, and prison0 which is not
4322 * listed.
4323 */
4324 db_show_prison(&prison0);
4325 if (!db_pager_quit) {
4326 TAILQ_FOREACH(pr, &allprison, pr_list) {
4327 db_show_prison(pr);
4328 if (db_pager_quit)
4329 break;
4330 }
4331 }
4332 return;
4333 }
4334
4335 if (addr == 0)
4336 pr = &prison0;
4337 else {
4338 /* Look for a prison with the ID and with references. */
4339 TAILQ_FOREACH(pr, &allprison, pr_list)
4340 if (pr->pr_id == addr && pr->pr_ref > 0)
4341 break;
4342 if (pr == NULL)
4343 /* Look again, without requiring a reference. */
4344 TAILQ_FOREACH(pr, &allprison, pr_list)
4345 if (pr->pr_id == addr)
4346 break;
4347 if (pr == NULL)
4348 /* Assume address points to a valid prison. */
4349 pr = (struct prison *)addr;
4350 }
4351 db_show_prison(pr);
4352 }
4353
4354 #endif /* DDB */
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