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cxgbe/t4_tom: Read the chip's DDP page sizes and save them in a
[freebsd-src.git] / sys / kern / kern_jail.c
blobebd714f0f74c39077c10a139d25d4053b345bf7e
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("$FreeBSD$");
31
32 #include "opt_compat.h"
33 #include "opt_ddb.h"
34 #include "opt_inet.h"
35 #include "opt_inet6.h"
36
37 #include <sys/param.h>
38 #include <sys/types.h>
39 #include <sys/kernel.h>
40 #include <sys/systm.h>
41 #include <sys/errno.h>
42 #include <sys/sysproto.h>
43 #include <sys/malloc.h>
44 #include <sys/osd.h>
45 #include <sys/priv.h>
46 #include <sys/proc.h>
47 #include <sys/taskqueue.h>
48 #include <sys/fcntl.h>
49 #include <sys/jail.h>
50 #include <sys/lock.h>
51 #include <sys/mutex.h>
52 #include <sys/racct.h>
53 #include <sys/refcount.h>
54 #include <sys/sx.h>
55 #include <sys/sysent.h>
56 #include <sys/namei.h>
57 #include <sys/mount.h>
58 #include <sys/queue.h>
59 #include <sys/socket.h>
60 #include <sys/syscallsubr.h>
61 #include <sys/sysctl.h>
62 #include <sys/vnode.h>
63
64 #include <net/if.h>
65 #include <net/vnet.h>
66
67 #include <netinet/in.h>
68
69 #ifdef DDB
70 #include <ddb/ddb.h>
71 #endif /* DDB */
72
73 #include <security/mac/mac_framework.h>
74
75 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000"
76
77 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
78 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct 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 = "0",
99 .pr_ref = 1,
100 .pr_uref = 1,
101 .pr_path = "/",
102 .pr_securelevel = -1,
103 .pr_devfs_rsnum = 0,
104 .pr_childmax = JAIL_MAX,
105 .pr_hostuuid = DEFAULT_HOSTUUID,
106 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
107 #ifdef VIMAGE
108 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
109 #else
110 .pr_flags = PR_HOST|_PR_IP_SADDRSEL,
111 #endif
112 .pr_allow = PR_ALLOW_ALL,
113 };
114 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
115
116 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */
117 struct sx allprison_lock;
118 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
119 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
120 LIST_HEAD(, prison_racct) allprison_racct;
121 int lastprid = 0;
122
123 static int do_jail_attach(struct thread *td, struct prison *pr);
124 static void prison_complete(void *context, int pending);
125 static void prison_deref(struct prison *pr, int flags);
126 static char *prison_path(struct prison *pr1, struct prison *pr2);
127 static void prison_remove_one(struct prison *pr);
128 #ifdef RACCT
129 static void prison_racct_attach(struct prison *pr);
130 static void prison_racct_modify(struct prison *pr);
131 static void prison_racct_detach(struct prison *pr);
132 #endif
133 #ifdef INET
134 static int _prison_check_ip4(const struct prison *, const struct in_addr *);
135 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4);
136 #endif
137 #ifdef INET6
138 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6);
139 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6);
140 #endif
141
142 /* Flags for prison_deref */
143 #define PD_DEREF 0x01
144 #define PD_DEUREF 0x02
145 #define PD_LOCKED 0x04
146 #define PD_LIST_SLOCKED 0x08
147 #define PD_LIST_XLOCKED 0x10
148
149 /*
150 * Parameter names corresponding to PR_* flag values. Size values are for kvm
151 * as we cannot figure out the size of a sparse array, or an array without a
152 * terminating entry.
153 */
154 static char *pr_flag_names[] = {
155 [0] = "persist",
156 #ifdef INET
157 [7] = "ip4.saddrsel",
158 #endif
159 #ifdef INET6
160 [8] = "ip6.saddrsel",
161 #endif
162 };
163 const size_t pr_flag_names_size = sizeof(pr_flag_names);
164
165 static char *pr_flag_nonames[] = {
166 [0] = "nopersist",
167 #ifdef INET
168 [7] = "ip4.nosaddrsel",
169 #endif
170 #ifdef INET6
171 [8] = "ip6.nosaddrsel",
172 #endif
173 };
174 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames);
175
176 struct jailsys_flags {
177 const char *name;
178 unsigned disable;
179 unsigned new;
180 } pr_flag_jailsys[] = {
181 { "host", 0, PR_HOST },
182 #ifdef VIMAGE
183 { "vnet", 0, PR_VNET },
184 #endif
185 #ifdef INET
186 { "ip4", PR_IP4_USER, PR_IP4_USER },
187 #endif
188 #ifdef INET6
189 { "ip6", PR_IP6_USER, PR_IP6_USER },
190 #endif
191 };
192 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
193
194 static char *pr_allow_names[] = {
195 "allow.set_hostname",
196 "allow.sysvipc",
197 "allow.raw_sockets",
198 "allow.chflags",
199 "allow.mount",
200 "allow.quotas",
201 "allow.socket_af",
202 "allow.mount.devfs",
203 "allow.mount.nullfs",
204 "allow.mount.zfs",
205 "allow.mount.procfs",
206 "allow.mount.tmpfs",
207 "allow.mount.fdescfs",
208 "allow.mount.linprocfs",
209 "allow.mount.linsysfs",
210 };
211 const size_t pr_allow_names_size = sizeof(pr_allow_names);
212
213 static char *pr_allow_nonames[] = {
214 "allow.noset_hostname",
215 "allow.nosysvipc",
216 "allow.noraw_sockets",
217 "allow.nochflags",
218 "allow.nomount",
219 "allow.noquotas",
220 "allow.nosocket_af",
221 "allow.mount.nodevfs",
222 "allow.mount.nonullfs",
223 "allow.mount.nozfs",
224 "allow.mount.noprocfs",
225 "allow.mount.notmpfs",
226 "allow.mount.nofdescfs",
227 "allow.mount.nolinprocfs",
228 "allow.mount.nolinsysfs",
229 };
230 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames);
231
232 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME
233 #define JAIL_DEFAULT_ENFORCE_STATFS 2
234 #define JAIL_DEFAULT_DEVFS_RSNUM 0
235 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
236 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
237 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
238 #if defined(INET) || defined(INET6)
239 static unsigned jail_max_af_ips = 255;
240 #endif
241
242 /*
243 * Initialize the parts of prison0 that can't be static-initialized with
244 * constants. This is called from proc0_init() after creating thread0 cpuset.
245 */
246 void
247 prison0_init(void)
248 {
249
250 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset);
251 prison0.pr_osreldate = osreldate;
252 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease));
253 }
254
255 #ifdef INET
256 static int
257 qcmp_v4(const void *ip1, const void *ip2)
258 {
259 in_addr_t iaa, iab;
260
261 /*
262 * We need to compare in HBO here to get the list sorted as expected
263 * by the result of the code. Sorting NBO addresses gives you
264 * interesting results. If you do not understand, do not try.
265 */
266 iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
267 iab = ntohl(((const struct in_addr *)ip2)->s_addr);
268
269 /*
270 * Do not simply return the difference of the two numbers, the int is
271 * not wide enough.
272 */
273 if (iaa > iab)
274 return (1);
275 else if (iaa < iab)
276 return (-1);
277 else
278 return (0);
279 }
280 #endif
281
282 #ifdef INET6
283 static int
284 qcmp_v6(const void *ip1, const void *ip2)
285 {
286 const struct in6_addr *ia6a, *ia6b;
287 int i, rc;
288
289 ia6a = (const struct in6_addr *)ip1;
290 ia6b = (const struct in6_addr *)ip2;
291
292 rc = 0;
293 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
294 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
295 rc = 1;
296 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
297 rc = -1;
298 }
299 return (rc);
300 }
301 #endif
302
303 /*
304 * struct jail_args {
305 * struct jail *jail;
306 * };
307 */
308 int
309 sys_jail(struct thread *td, struct jail_args *uap)
310 {
311 uint32_t version;
312 int error;
313 struct jail j;
314
315 error = copyin(uap->jail, &version, sizeof(uint32_t));
316 if (error)
317 return (error);
318
319 switch (version) {
320 case 0:
321 {
322 struct jail_v0 j0;
323
324 /* FreeBSD single IPv4 jails. */
325 bzero(&j, sizeof(struct jail));
326 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
327 if (error)
328 return (error);
329 j.version = j0.version;
330 j.path = j0.path;
331 j.hostname = j0.hostname;
332 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */
333 break;
334 }
335
336 case 1:
337 /*
338 * Version 1 was used by multi-IPv4 jail implementations
339 * that never made it into the official kernel.
340 */
341 return (EINVAL);
342
343 case 2: /* JAIL_API_VERSION */
344 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
345 error = copyin(uap->jail, &j, sizeof(struct jail));
346 if (error)
347 return (error);
348 break;
349
350 default:
351 /* Sci-Fi jails are not supported, sorry. */
352 return (EINVAL);
353 }
354 return (kern_jail(td, &j));
355 }
356
357 int
358 kern_jail(struct thread *td, struct jail *j)
359 {
360 struct iovec optiov[2 * (4 + nitems(pr_allow_names)
361 #ifdef INET
362 + 1
363 #endif
364 #ifdef INET6
365 + 1
366 #endif
367 )];
368 struct uio opt;
369 char *u_path, *u_hostname, *u_name;
370 #ifdef INET
371 uint32_t ip4s;
372 struct in_addr *u_ip4;
373 #endif
374 #ifdef INET6
375 struct in6_addr *u_ip6;
376 #endif
377 size_t tmplen;
378 int error, enforce_statfs, fi;
379
380 bzero(&optiov, sizeof(optiov));
381 opt.uio_iov = optiov;
382 opt.uio_iovcnt = 0;
383 opt.uio_offset = -1;
384 opt.uio_resid = -1;
385 opt.uio_segflg = UIO_SYSSPACE;
386 opt.uio_rw = UIO_READ;
387 opt.uio_td = td;
388
389 /* Set permissions for top-level jails from sysctls. */
390 if (!jailed(td->td_ucred)) {
391 for (fi = 0; fi < nitems(pr_allow_names); fi++) {
392 optiov[opt.uio_iovcnt].iov_base =
393 (jail_default_allow & (1 << fi))
394 ? pr_allow_names[fi] : pr_allow_nonames[fi];
395 optiov[opt.uio_iovcnt].iov_len =
396 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
397 opt.uio_iovcnt += 2;
398 }
399 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
400 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
401 opt.uio_iovcnt++;
402 enforce_statfs = jail_default_enforce_statfs;
403 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
404 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
405 opt.uio_iovcnt++;
406 }
407
408 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
409 #ifdef INET
410 ip4s = (j->version == 0) ? 1 : j->ip4s;
411 if (ip4s > jail_max_af_ips)
412 return (EINVAL);
413 tmplen += ip4s * sizeof(struct in_addr);
414 #else
415 if (j->ip4s > 0)
416 return (EINVAL);
417 #endif
418 #ifdef INET6
419 if (j->ip6s > jail_max_af_ips)
420 return (EINVAL);
421 tmplen += j->ip6s * sizeof(struct in6_addr);
422 #else
423 if (j->ip6s > 0)
424 return (EINVAL);
425 #endif
426 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
427 u_hostname = u_path + MAXPATHLEN;
428 u_name = u_hostname + MAXHOSTNAMELEN;
429 #ifdef INET
430 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
431 #endif
432 #ifdef INET6
433 #ifdef INET
434 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
435 #else
436 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
437 #endif
438 #endif
439 optiov[opt.uio_iovcnt].iov_base = "path";
440 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
441 opt.uio_iovcnt++;
442 optiov[opt.uio_iovcnt].iov_base = u_path;
443 error = copyinstr(j->path, u_path, MAXPATHLEN,
444 &optiov[opt.uio_iovcnt].iov_len);
445 if (error) {
446 free(u_path, M_TEMP);
447 return (error);
448 }
449 opt.uio_iovcnt++;
450 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
451 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
452 opt.uio_iovcnt++;
453 optiov[opt.uio_iovcnt].iov_base = u_hostname;
454 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
455 &optiov[opt.uio_iovcnt].iov_len);
456 if (error) {
457 free(u_path, M_TEMP);
458 return (error);
459 }
460 opt.uio_iovcnt++;
461 if (j->jailname != NULL) {
462 optiov[opt.uio_iovcnt].iov_base = "name";
463 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
464 opt.uio_iovcnt++;
465 optiov[opt.uio_iovcnt].iov_base = u_name;
466 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
467 &optiov[opt.uio_iovcnt].iov_len);
468 if (error) {
469 free(u_path, M_TEMP);
470 return (error);
471 }
472 opt.uio_iovcnt++;
473 }
474 #ifdef INET
475 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
476 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
477 opt.uio_iovcnt++;
478 optiov[opt.uio_iovcnt].iov_base = u_ip4;
479 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
480 if (j->version == 0)
481 u_ip4->s_addr = j->ip4s;
482 else {
483 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
484 if (error) {
485 free(u_path, M_TEMP);
486 return (error);
487 }
488 }
489 opt.uio_iovcnt++;
490 #endif
491 #ifdef INET6
492 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
493 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
494 opt.uio_iovcnt++;
495 optiov[opt.uio_iovcnt].iov_base = u_ip6;
496 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
497 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
498 if (error) {
499 free(u_path, M_TEMP);
500 return (error);
501 }
502 opt.uio_iovcnt++;
503 #endif
504 KASSERT(opt.uio_iovcnt <= nitems(optiov),
505 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
506 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
507 free(u_path, M_TEMP);
508 return (error);
509 }
510
511
512 /*
513 * struct jail_set_args {
514 * struct iovec *iovp;
515 * unsigned int iovcnt;
516 * int flags;
517 * };
518 */
519 int
520 sys_jail_set(struct thread *td, struct jail_set_args *uap)
521 {
522 struct uio *auio;
523 int error;
524
525 /* Check that we have an even number of iovecs. */
526 if (uap->iovcnt & 1)
527 return (EINVAL);
528
529 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
530 if (error)
531 return (error);
532 error = kern_jail_set(td, auio, uap->flags);
533 free(auio, M_IOV);
534 return (error);
535 }
536
537 int
538 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
539 {
540 struct nameidata nd;
541 #ifdef INET
542 struct in_addr *ip4;
543 #endif
544 #ifdef INET6
545 struct in6_addr *ip6;
546 #endif
547 struct vfsopt *opt;
548 struct vfsoptlist *opts;
549 struct prison *pr, *deadpr, *mypr, *ppr, *tpr;
550 struct vnode *root;
551 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
552 char *g_path, *osrelstr;
553 #if defined(INET) || defined(INET6)
554 struct prison *tppr;
555 void *op;
556 #endif
557 unsigned long hid;
558 size_t namelen, onamelen, pnamelen;
559 int born, created, cuflags, descend, enforce;
560 int error, errmsg_len, errmsg_pos;
561 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
562 int fi, jid, jsys, len, level;
563 int childmax, osreldt, rsnum, slevel;
564 int fullpath_disabled;
565 #if defined(INET) || defined(INET6)
566 int ii, ij;
567 #endif
568 #ifdef INET
569 int ip4s, redo_ip4;
570 #endif
571 #ifdef INET6
572 int ip6s, redo_ip6;
573 #endif
574 uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
575 unsigned tallow;
576 char numbuf[12];
577
578 error = priv_check(td, PRIV_JAIL_SET);
579 if (!error && (flags & JAIL_ATTACH))
580 error = priv_check(td, PRIV_JAIL_ATTACH);
581 if (error)
582 return (error);
583 mypr = td->td_ucred->cr_prison;
584 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
585 return (EPERM);
586 if (flags & ~JAIL_SET_MASK)
587 return (EINVAL);
588
589 /*
590 * Check all the parameters before committing to anything. Not all
591 * errors can be caught early, but we may as well try. Also, this
592 * takes care of some expensive stuff (path lookup) before getting
593 * the allprison lock.
594 *
595 * XXX Jails are not filesystems, and jail parameters are not mount
596 * options. But it makes more sense to re-use the vfsopt code
597 * than duplicate it under a different name.
598 */
599 error = vfs_buildopts(optuio, &opts);
600 if (error)
601 return (error);
602 #ifdef INET
603 ip4 = NULL;
604 #endif
605 #ifdef INET6
606 ip6 = NULL;
607 #endif
608 g_path = NULL;
609
610 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
611 if (!cuflags) {
612 error = EINVAL;
613 vfs_opterror(opts, "no valid operation (create or update)");
614 goto done_errmsg;
615 }
616
617 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
618 if (error == ENOENT)
619 jid = 0;
620 else if (error != 0)
621 goto done_free;
622
623 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
624 if (error == ENOENT)
625 gotslevel = 0;
626 else if (error != 0)
627 goto done_free;
628 else
629 gotslevel = 1;
630
631 error =
632 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
633 if (error == ENOENT)
634 gotchildmax = 0;
635 else if (error != 0)
636 goto done_free;
637 else
638 gotchildmax = 1;
639
640 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
641 if (error == ENOENT)
642 gotenforce = 0;
643 else if (error != 0)
644 goto done_free;
645 else if (enforce < 0 || enforce > 2) {
646 error = EINVAL;
647 goto done_free;
648 } else
649 gotenforce = 1;
650
651 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
652 if (error == ENOENT)
653 gotrsnum = 0;
654 else if (error != 0)
655 goto done_free;
656 else
657 gotrsnum = 1;
658
659 pr_flags = ch_flags = 0;
660 for (fi = 0; fi < nitems(pr_flag_names); fi++) {
661 if (pr_flag_names[fi] == NULL)
662 continue;
663 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi);
664 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi);
665 }
666 ch_flags |= pr_flags;
667 for (fi = 0; fi < nitems(pr_flag_jailsys); fi++) {
668 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys,
669 sizeof(jsys));
670 if (error == ENOENT)
671 continue;
672 if (error != 0)
673 goto done_free;
674 switch (jsys) {
675 case JAIL_SYS_DISABLE:
676 if (!pr_flag_jailsys[fi].disable) {
677 error = EINVAL;
678 goto done_free;
679 }
680 pr_flags |= pr_flag_jailsys[fi].disable;
681 break;
682 case JAIL_SYS_NEW:
683 pr_flags |= pr_flag_jailsys[fi].new;
684 break;
685 case JAIL_SYS_INHERIT:
686 break;
687 default:
688 error = EINVAL;
689 goto done_free;
690 }
691 ch_flags |=
692 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable;
693 }
694 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE
695 && !(pr_flags & PR_PERSIST)) {
696 error = EINVAL;
697 vfs_opterror(opts, "new jail must persist or attach");
698 goto done_errmsg;
699 }
700 #ifdef VIMAGE
701 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
702 error = EINVAL;
703 vfs_opterror(opts, "vnet cannot be changed after creation");
704 goto done_errmsg;
705 }
706 #endif
707 #ifdef INET
708 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
709 error = EINVAL;
710 vfs_opterror(opts, "ip4 cannot be changed after creation");
711 goto done_errmsg;
712 }
713 #endif
714 #ifdef INET6
715 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
716 error = EINVAL;
717 vfs_opterror(opts, "ip6 cannot be changed after creation");
718 goto done_errmsg;
719 }
720 #endif
721
722 pr_allow = ch_allow = 0;
723 for (fi = 0; fi < nitems(pr_allow_names); fi++) {
724 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi);
725 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi);
726 }
727 ch_allow |= pr_allow;
728
729 error = vfs_getopt(opts, "name", (void **)&name, &len);
730 if (error == ENOENT)
731 name = NULL;
732 else if (error != 0)
733 goto done_free;
734 else {
735 if (len == 0 || name[len - 1] != '\0') {
736 error = EINVAL;
737 goto done_free;
738 }
739 if (len > MAXHOSTNAMELEN) {
740 error = ENAMETOOLONG;
741 goto done_free;
742 }
743 }
744
745 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
746 if (error == ENOENT)
747 host = NULL;
748 else if (error != 0)
749 goto done_free;
750 else {
751 ch_flags |= PR_HOST;
752 pr_flags |= PR_HOST;
753 if (len == 0 || host[len - 1] != '\0') {
754 error = EINVAL;
755 goto done_free;
756 }
757 if (len > MAXHOSTNAMELEN) {
758 error = ENAMETOOLONG;
759 goto done_free;
760 }
761 }
762
763 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
764 if (error == ENOENT)
765 domain = NULL;
766 else if (error != 0)
767 goto done_free;
768 else {
769 ch_flags |= PR_HOST;
770 pr_flags |= PR_HOST;
771 if (len == 0 || domain[len - 1] != '\0') {
772 error = EINVAL;
773 goto done_free;
774 }
775 if (len > MAXHOSTNAMELEN) {
776 error = ENAMETOOLONG;
777 goto done_free;
778 }
779 }
780
781 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
782 if (error == ENOENT)
783 uuid = NULL;
784 else if (error != 0)
785 goto done_free;
786 else {
787 ch_flags |= PR_HOST;
788 pr_flags |= PR_HOST;
789 if (len == 0 || uuid[len - 1] != '\0') {
790 error = EINVAL;
791 goto done_free;
792 }
793 if (len > HOSTUUIDLEN) {
794 error = ENAMETOOLONG;
795 goto done_free;
796 }
797 }
798
799 #ifdef COMPAT_FREEBSD32
800 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
801 uint32_t hid32;
802
803 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
804 hid = hid32;
805 } else
806 #endif
807 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
808 if (error == ENOENT)
809 gothid = 0;
810 else if (error != 0)
811 goto done_free;
812 else {
813 gothid = 1;
814 ch_flags |= PR_HOST;
815 pr_flags |= PR_HOST;
816 }
817
818 #ifdef INET
819 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
820 if (error == ENOENT)
821 ip4s = 0;
822 else if (error != 0)
823 goto done_free;
824 else if (ip4s & (sizeof(*ip4) - 1)) {
825 error = EINVAL;
826 goto done_free;
827 } else {
828 ch_flags |= PR_IP4_USER;
829 pr_flags |= PR_IP4_USER;
830 if (ip4s > 0) {
831 ip4s /= sizeof(*ip4);
832 if (ip4s > jail_max_af_ips) {
833 error = EINVAL;
834 vfs_opterror(opts, "too many IPv4 addresses");
835 goto done_errmsg;
836 }
837 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
838 bcopy(op, ip4, ip4s * sizeof(*ip4));
839 /*
840 * IP addresses are all sorted but ip[0] to preserve
841 * the primary IP address as given from userland.
842 * This special IP is used for unbound outgoing
843 * connections as well for "loopback" traffic in case
844 * source address selection cannot find any more fitting
845 * address to connect from.
846 */
847 if (ip4s > 1)
848 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4);
849 /*
850 * Check for duplicate addresses and do some simple
851 * zero and broadcast checks. If users give other bogus
852 * addresses it is their problem.
853 *
854 * We do not have to care about byte order for these
855 * checks so we will do them in NBO.
856 */
857 for (ii = 0; ii < ip4s; ii++) {
858 if (ip4[ii].s_addr == INADDR_ANY ||
859 ip4[ii].s_addr == INADDR_BROADCAST) {
860 error = EINVAL;
861 goto done_free;
862 }
863 if ((ii+1) < ip4s &&
864 (ip4[0].s_addr == ip4[ii+1].s_addr ||
865 ip4[ii].s_addr == ip4[ii+1].s_addr)) {
866 error = EINVAL;
867 goto done_free;
868 }
869 }
870 }
871 }
872 #endif
873
874 #ifdef INET6
875 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
876 if (error == ENOENT)
877 ip6s = 0;
878 else if (error != 0)
879 goto done_free;
880 else if (ip6s & (sizeof(*ip6) - 1)) {
881 error = EINVAL;
882 goto done_free;
883 } else {
884 ch_flags |= PR_IP6_USER;
885 pr_flags |= PR_IP6_USER;
886 if (ip6s > 0) {
887 ip6s /= sizeof(*ip6);
888 if (ip6s > jail_max_af_ips) {
889 error = EINVAL;
890 vfs_opterror(opts, "too many IPv6 addresses");
891 goto done_errmsg;
892 }
893 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
894 bcopy(op, ip6, ip6s * sizeof(*ip6));
895 if (ip6s > 1)
896 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6);
897 for (ii = 0; ii < ip6s; ii++) {
898 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
899 error = EINVAL;
900 goto done_free;
901 }
902 if ((ii+1) < ip6s &&
903 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
904 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
905 {
906 error = EINVAL;
907 goto done_free;
908 }
909 }
910 }
911 }
912 #endif
913
914 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
915 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
916 error = EINVAL;
917 vfs_opterror(opts,
918 "vnet jails cannot have IP address restrictions");
919 goto done_errmsg;
920 }
921 #endif
922
923 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len);
924 if (error == ENOENT)
925 osrelstr = NULL;
926 else if (error != 0)
927 goto done_free;
928 else {
929 if (flags & JAIL_UPDATE) {
930 error = EINVAL;
931 vfs_opterror(opts,
932 "osrelease cannot be changed after creation");
933 goto done_errmsg;
934 }
935 if (len == 0 || len >= OSRELEASELEN) {
936 error = EINVAL;
937 vfs_opterror(opts,
938 "osrelease string must be 1-%d bytes long",
939 OSRELEASELEN - 1);
940 goto done_errmsg;
941 }
942 }
943
944 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt));
945 if (error == ENOENT)
946 osreldt = 0;
947 else if (error != 0)
948 goto done_free;
949 else {
950 if (flags & JAIL_UPDATE) {
951 error = EINVAL;
952 vfs_opterror(opts,
953 "osreldate cannot be changed after creation");
954 goto done_errmsg;
955 }
956 if (osreldt == 0) {
957 error = EINVAL;
958 vfs_opterror(opts, "osreldate cannot be 0");
959 goto done_errmsg;
960 }
961 }
962
963 fullpath_disabled = 0;
964 root = NULL;
965 error = vfs_getopt(opts, "path", (void **)&path, &len);
966 if (error == ENOENT)
967 path = NULL;
968 else if (error != 0)
969 goto done_free;
970 else {
971 if (flags & JAIL_UPDATE) {
972 error = EINVAL;
973 vfs_opterror(opts,
974 "path cannot be changed after creation");
975 goto done_errmsg;
976 }
977 if (len == 0 || path[len - 1] != '\0') {
978 error = EINVAL;
979 goto done_free;
980 }
981 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
982 path, td);
983 error = namei(&nd);
984 if (error)
985 goto done_free;
986 root = nd.ni_vp;
987 NDFREE(&nd, NDF_ONLY_PNBUF);
988 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
989 strlcpy(g_path, path, MAXPATHLEN);
990 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
991 if (error == 0)
992 path = g_path;
993 else if (error == ENODEV) {
994 /* proceed if sysctl debug.disablefullpath == 1 */
995 fullpath_disabled = 1;
996 if (len < 2 || (len == 2 && path[0] == '/'))
997 path = NULL;
998 } else {
999 /* exit on other errors */
1000 goto done_free;
1001 }
1002 if (root->v_type != VDIR) {
1003 error = ENOTDIR;
1004 vput(root);
1005 goto done_free;
1006 }
1007 VOP_UNLOCK(root, 0);
1008 if (fullpath_disabled) {
1009 /* Leave room for a real-root full pathname. */
1010 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/")
1011 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) {
1012 error = ENAMETOOLONG;
1013 vrele(root);
1014 goto done_free;
1015 }
1016 }
1017 }
1018
1019 /*
1020 * Find the specified jail, or at least its parent.
1021 * This abuses the file error codes ENOENT and EEXIST.
1022 */
1023 pr = NULL;
1024 ppr = mypr;
1025 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
1026 namelc = strrchr(name, '.');
1027 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
1028 if (*p != '\0')
1029 jid = 0;
1030 }
1031 sx_xlock(&allprison_lock);
1032 if (jid != 0) {
1033 /*
1034 * See if a requested jid already exists. There is an
1035 * information leak here if the jid exists but is not within
1036 * the caller's jail hierarchy. Jail creators will get EEXIST
1037 * even though they cannot see the jail, and CREATE | UPDATE
1038 * will return ENOENT which is not normally a valid error.
1039 */
1040 if (jid < 0) {
1041 error = EINVAL;
1042 vfs_opterror(opts, "negative jid");
1043 goto done_unlock_list;
1044 }
1045 pr = prison_find(jid);
1046 if (pr != NULL) {
1047 ppr = pr->pr_parent;
1048 /* Create: jid must not exist. */
1049 if (cuflags == JAIL_CREATE) {
1050 mtx_unlock(&pr->pr_mtx);
1051 error = EEXIST;
1052 vfs_opterror(opts, "jail %d already exists",
1053 jid);
1054 goto done_unlock_list;
1055 }
1056 if (!prison_ischild(mypr, pr)) {
1057 mtx_unlock(&pr->pr_mtx);
1058 pr = NULL;
1059 } else if (pr->pr_uref == 0) {
1060 if (!(flags & JAIL_DYING)) {
1061 mtx_unlock(&pr->pr_mtx);
1062 error = ENOENT;
1063 vfs_opterror(opts, "jail %d is dying",
1064 jid);
1065 goto done_unlock_list;
1066 } else if ((flags & JAIL_ATTACH) ||
1067 (pr_flags & PR_PERSIST)) {
1068 /*
1069 * A dying jail might be resurrected
1070 * (via attach or persist), but first
1071 * it must determine if another jail
1072 * has claimed its name. Accomplish
1073 * this by implicitly re-setting the
1074 * name.
1075 */
1076 if (name == NULL)
1077 name = prison_name(mypr, pr);
1078 }
1079 }
1080 }
1081 if (pr == NULL) {
1082 /* Update: jid must exist. */
1083 if (cuflags == JAIL_UPDATE) {
1084 error = ENOENT;
1085 vfs_opterror(opts, "jail %d not found", jid);
1086 goto done_unlock_list;
1087 }
1088 }
1089 }
1090 /*
1091 * If the caller provided a name, look for a jail by that name.
1092 * This has different semantics for creates and updates keyed by jid
1093 * (where the name must not already exist in a different jail),
1094 * and updates keyed by the name itself (where the name must exist
1095 * because that is the jail being updated).
1096 */
1097 namelc = NULL;
1098 if (name != NULL) {
1099 namelc = strrchr(name, '.');
1100 if (namelc == NULL)
1101 namelc = name;
1102 else {
1103 /*
1104 * This is a hierarchical name. Split it into the
1105 * parent and child names, and make sure the parent
1106 * exists or matches an already found jail.
1107 */
1108 if (pr != NULL) {
1109 if (strncmp(name, ppr->pr_name, namelc - name)
1110 || ppr->pr_name[namelc - name] != '\0') {
1111 mtx_unlock(&pr->pr_mtx);
1112 error = EINVAL;
1113 vfs_opterror(opts,
1114 "cannot change jail's parent");
1115 goto done_unlock_list;
1116 }
1117 } else {
1118 *namelc = '\0';
1119 ppr = prison_find_name(mypr, name);
1120 if (ppr == NULL) {
1121 error = ENOENT;
1122 vfs_opterror(opts,
1123 "jail \"%s\" not found", name);
1124 goto done_unlock_list;
1125 }
1126 mtx_unlock(&ppr->pr_mtx);
1127 *namelc = '.';
1128 }
1129 namelc++;
1130 }
1131 if (namelc[0] != '\0') {
1132 pnamelen =
1133 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1134 name_again:
1135 deadpr = NULL;
1136 FOREACH_PRISON_CHILD(ppr, tpr) {
1137 if (tpr != pr && tpr->pr_ref > 0 &&
1138 !strcmp(tpr->pr_name + pnamelen, namelc)) {
1139 if (pr == NULL &&
1140 cuflags != JAIL_CREATE) {
1141 mtx_lock(&tpr->pr_mtx);
1142 if (tpr->pr_ref > 0) {
1143 /*
1144 * Use this jail
1145 * for updates.
1146 */
1147 if (tpr->pr_uref > 0) {
1148 pr = tpr;
1149 break;
1150 }
1151 deadpr = tpr;
1152 }
1153 mtx_unlock(&tpr->pr_mtx);
1154 } else if (tpr->pr_uref > 0) {
1155 /*
1156 * Create, or update(jid):
1157 * name must not exist in an
1158 * active sibling jail.
1159 */
1160 error = EEXIST;
1161 if (pr != NULL)
1162 mtx_unlock(&pr->pr_mtx);
1163 vfs_opterror(opts,
1164 "jail \"%s\" already exists",
1165 name);
1166 goto done_unlock_list;
1167 }
1168 }
1169 }
1170 /* If no active jail is found, use a dying one. */
1171 if (deadpr != NULL && pr == NULL) {
1172 if (flags & JAIL_DYING) {
1173 mtx_lock(&deadpr->pr_mtx);
1174 if (deadpr->pr_ref == 0) {
1175 mtx_unlock(&deadpr->pr_mtx);
1176 goto name_again;
1177 }
1178 pr = deadpr;
1179 } else if (cuflags == JAIL_UPDATE) {
1180 error = ENOENT;
1181 vfs_opterror(opts,
1182 "jail \"%s\" is dying", name);
1183 goto done_unlock_list;
1184 }
1185 }
1186 /* Update: name must exist if no jid. */
1187 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1188 error = ENOENT;
1189 vfs_opterror(opts, "jail \"%s\" not found",
1190 name);
1191 goto done_unlock_list;
1192 }
1193 }
1194 }
1195 /* Update: must provide a jid or name. */
1196 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1197 error = ENOENT;
1198 vfs_opterror(opts, "update specified no jail");
1199 goto done_unlock_list;
1200 }
1201
1202 /* If there's no prison to update, create a new one and link it in. */
1203 if (pr == NULL) {
1204 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1205 if (tpr->pr_childcount >= tpr->pr_childmax) {
1206 error = EPERM;
1207 vfs_opterror(opts, "prison limit exceeded");
1208 goto done_unlock_list;
1209 }
1210 created = 1;
1211 mtx_lock(&ppr->pr_mtx);
1212 if (ppr->pr_ref == 0) {
1213 mtx_unlock(&ppr->pr_mtx);
1214 error = ENOENT;
1215 vfs_opterror(opts, "jail \"%s\" not found",
1216 prison_name(mypr, ppr));
1217 goto done_unlock_list;
1218 }
1219 ppr->pr_ref++;
1220 ppr->pr_uref++;
1221 mtx_unlock(&ppr->pr_mtx);
1222 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1223 if (jid == 0) {
1224 /* Find the next free jid. */
1225 jid = lastprid + 1;
1226 findnext:
1227 if (jid == JAIL_MAX)
1228 jid = 1;
1229 TAILQ_FOREACH(tpr, &allprison, pr_list) {
1230 if (tpr->pr_id < jid)
1231 continue;
1232 if (tpr->pr_id > jid || tpr->pr_ref == 0) {
1233 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1234 break;
1235 }
1236 if (jid == lastprid) {
1237 error = EAGAIN;
1238 vfs_opterror(opts,
1239 "no available jail IDs");
1240 free(pr, M_PRISON);
1241 prison_deref(ppr, PD_DEREF |
1242 PD_DEUREF | PD_LIST_XLOCKED);
1243 goto done_releroot;
1244 }
1245 jid++;
1246 goto findnext;
1247 }
1248 lastprid = jid;
1249 } else {
1250 /*
1251 * The jail already has a jid (that did not yet exist),
1252 * so just find where to insert it.
1253 */
1254 TAILQ_FOREACH(tpr, &allprison, pr_list)
1255 if (tpr->pr_id >= jid) {
1256 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1257 break;
1258 }
1259 }
1260 if (tpr == NULL)
1261 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1262 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1263 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1264 tpr->pr_childcount++;
1265
1266 pr->pr_parent = ppr;
1267 pr->pr_id = jid;
1268
1269 /* Set some default values, and inherit some from the parent. */
1270 if (namelc == NULL)
1271 namelc = "";
1272 if (path == NULL) {
1273 path = "/";
1274 root = mypr->pr_root;
1275 vref(root);
1276 }
1277 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1278 pr->pr_flags |= PR_HOST;
1279 #if defined(INET) || defined(INET6)
1280 #ifdef VIMAGE
1281 if (!(pr_flags & PR_VNET))
1282 #endif
1283 {
1284 #ifdef INET
1285 if (!(ch_flags & PR_IP4_USER))
1286 pr->pr_flags |= PR_IP4 | PR_IP4_USER;
1287 else if (!(pr_flags & PR_IP4_USER)) {
1288 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1289 if (ppr->pr_ip4 != NULL) {
1290 pr->pr_ip4s = ppr->pr_ip4s;
1291 pr->pr_ip4 = malloc(pr->pr_ip4s *
1292 sizeof(struct in_addr), M_PRISON,
1293 M_WAITOK);
1294 bcopy(ppr->pr_ip4, pr->pr_ip4,
1295 pr->pr_ip4s * sizeof(*pr->pr_ip4));
1296 }
1297 }
1298 #endif
1299 #ifdef INET6
1300 if (!(ch_flags & PR_IP6_USER))
1301 pr->pr_flags |= PR_IP6 | PR_IP6_USER;
1302 else if (!(pr_flags & PR_IP6_USER)) {
1303 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1304 if (ppr->pr_ip6 != NULL) {
1305 pr->pr_ip6s = ppr->pr_ip6s;
1306 pr->pr_ip6 = malloc(pr->pr_ip6s *
1307 sizeof(struct in6_addr), M_PRISON,
1308 M_WAITOK);
1309 bcopy(ppr->pr_ip6, pr->pr_ip6,
1310 pr->pr_ip6s * sizeof(*pr->pr_ip6));
1311 }
1312 }
1313 #endif
1314 }
1315 #endif
1316 /* Source address selection is always on by default. */
1317 pr->pr_flags |= _PR_IP_SADDRSEL;
1318
1319 pr->pr_securelevel = ppr->pr_securelevel;
1320 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1321 pr->pr_enforce_statfs = jail_default_enforce_statfs;
1322 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
1323
1324 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate;
1325 if (osrelstr == NULL)
1326 strcpy(pr->pr_osrelease, ppr->pr_osrelease);
1327 else
1328 strcpy(pr->pr_osrelease, osrelstr);
1329
1330 LIST_INIT(&pr->pr_children);
1331 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1332 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
1333
1334 #ifdef VIMAGE
1335 /* Allocate a new vnet if specified. */
1336 pr->pr_vnet = (pr_flags & PR_VNET)
1337 ? vnet_alloc() : ppr->pr_vnet;
1338 #endif
1339 /*
1340 * Allocate a dedicated cpuset for each jail.
1341 * Unlike other initial settings, this may return an erorr.
1342 */
1343 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1344 if (error) {
1345 prison_deref(pr, PD_LIST_XLOCKED);
1346 goto done_releroot;
1347 }
1348
1349 mtx_lock(&pr->pr_mtx);
1350 /*
1351 * New prisons do not yet have a reference, because we do not
1352 * want others to see the incomplete prison once the
1353 * allprison_lock is downgraded.
1354 */
1355 } else {
1356 created = 0;
1357 /*
1358 * Grab a reference for existing prisons, to ensure they
1359 * continue to exist for the duration of the call.
1360 */
1361 pr->pr_ref++;
1362 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1363 if ((pr->pr_flags & PR_VNET) &&
1364 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1365 error = EINVAL;
1366 vfs_opterror(opts,
1367 "vnet jails cannot have IP address restrictions");
1368 goto done_deref_locked;
1369 }
1370 #endif
1371 #ifdef INET
1372 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1373 error = EINVAL;
1374 vfs_opterror(opts,
1375 "ip4 cannot be changed after creation");
1376 goto done_deref_locked;
1377 }
1378 #endif
1379 #ifdef INET6
1380 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1381 error = EINVAL;
1382 vfs_opterror(opts,
1383 "ip6 cannot be changed after creation");
1384 goto done_deref_locked;
1385 }
1386 #endif
1387 }
1388
1389 /* Do final error checking before setting anything. */
1390 if (gotslevel) {
1391 if (slevel < ppr->pr_securelevel) {
1392 error = EPERM;
1393 goto done_deref_locked;
1394 }
1395 }
1396 if (gotchildmax) {
1397 if (childmax >= ppr->pr_childmax) {
1398 error = EPERM;
1399 goto done_deref_locked;
1400 }
1401 }
1402 if (gotenforce) {
1403 if (enforce < ppr->pr_enforce_statfs) {
1404 error = EPERM;
1405 goto done_deref_locked;
1406 }
1407 }
1408 if (gotrsnum) {
1409 /*
1410 * devfs_rsnum is a uint16_t
1411 */
1412 if (rsnum < 0 || rsnum > 65535) {
1413 error = EINVAL;
1414 goto done_deref_locked;
1415 }
1416 /*
1417 * Nested jails always inherit parent's devfs ruleset
1418 */
1419 if (jailed(td->td_ucred)) {
1420 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
1421 error = EPERM;
1422 goto done_deref_locked;
1423 } else
1424 rsnum = ppr->pr_devfs_rsnum;
1425 }
1426 }
1427 #ifdef INET
1428 if (ip4s > 0) {
1429 if (ppr->pr_flags & PR_IP4) {
1430 /*
1431 * Make sure the new set of IP addresses is a
1432 * subset of the parent's list. Don't worry
1433 * about the parent being unlocked, as any
1434 * setting is done with allprison_lock held.
1435 */
1436 for (ij = 0; ij < ppr->pr_ip4s; ij++)
1437 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
1438 break;
1439 if (ij == ppr->pr_ip4s) {
1440 error = EPERM;
1441 goto done_deref_locked;
1442 }
1443 if (ip4s > 1) {
1444 for (ii = ij = 1; ii < ip4s; ii++) {
1445 if (ip4[ii].s_addr ==
1446 ppr->pr_ip4[0].s_addr)
1447 continue;
1448 for (; ij < ppr->pr_ip4s; ij++)
1449 if (ip4[ii].s_addr ==
1450 ppr->pr_ip4[ij].s_addr)
1451 break;
1452 if (ij == ppr->pr_ip4s)
1453 break;
1454 }
1455 if (ij == ppr->pr_ip4s) {
1456 error = EPERM;
1457 goto done_deref_locked;
1458 }
1459 }
1460 }
1461 /*
1462 * Check for conflicting IP addresses. We permit them
1463 * if there is no more than one IP on each jail. If
1464 * there is a duplicate on a jail with more than one
1465 * IP stop checking and return error.
1466 */
1467 tppr = ppr;
1468 #ifdef VIMAGE
1469 for (; tppr != &prison0; tppr = tppr->pr_parent)
1470 if (tppr->pr_flags & PR_VNET)
1471 break;
1472 #endif
1473 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1474 if (tpr == pr ||
1475 #ifdef VIMAGE
1476 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1477 #endif
1478 tpr->pr_uref == 0) {
1479 descend = 0;
1480 continue;
1481 }
1482 if (!(tpr->pr_flags & PR_IP4_USER))
1483 continue;
1484 descend = 0;
1485 if (tpr->pr_ip4 == NULL ||
1486 (ip4s == 1 && tpr->pr_ip4s == 1))
1487 continue;
1488 for (ii = 0; ii < ip4s; ii++) {
1489 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) {
1490 error = EADDRINUSE;
1491 vfs_opterror(opts,
1492 "IPv4 addresses clash");
1493 goto done_deref_locked;
1494 }
1495 }
1496 }
1497 }
1498 #endif
1499 #ifdef INET6
1500 if (ip6s > 0) {
1501 if (ppr->pr_flags & PR_IP6) {
1502 /*
1503 * Make sure the new set of IP addresses is a
1504 * subset of the parent's list.
1505 */
1506 for (ij = 0; ij < ppr->pr_ip6s; ij++)
1507 if (IN6_ARE_ADDR_EQUAL(&ip6[0],
1508 &ppr->pr_ip6[ij]))
1509 break;
1510 if (ij == ppr->pr_ip6s) {
1511 error = EPERM;
1512 goto done_deref_locked;
1513 }
1514 if (ip6s > 1) {
1515 for (ii = ij = 1; ii < ip6s; ii++) {
1516 if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
1517 &ppr->pr_ip6[0]))
1518 continue;
1519 for (; ij < ppr->pr_ip6s; ij++)
1520 if (IN6_ARE_ADDR_EQUAL(
1521 &ip6[ii], &ppr->pr_ip6[ij]))
1522 break;
1523 if (ij == ppr->pr_ip6s)
1524 break;
1525 }
1526 if (ij == ppr->pr_ip6s) {
1527 error = EPERM;
1528 goto done_deref_locked;
1529 }
1530 }
1531 }
1532 /* Check for conflicting IP addresses. */
1533 tppr = ppr;
1534 #ifdef VIMAGE
1535 for (; tppr != &prison0; tppr = tppr->pr_parent)
1536 if (tppr->pr_flags & PR_VNET)
1537 break;
1538 #endif
1539 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1540 if (tpr == pr ||
1541 #ifdef VIMAGE
1542 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1543 #endif
1544 tpr->pr_uref == 0) {
1545 descend = 0;
1546 continue;
1547 }
1548 if (!(tpr->pr_flags & PR_IP6_USER))
1549 continue;
1550 descend = 0;
1551 if (tpr->pr_ip6 == NULL ||
1552 (ip6s == 1 && tpr->pr_ip6s == 1))
1553 continue;
1554 for (ii = 0; ii < ip6s; ii++) {
1555 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) {
1556 error = EADDRINUSE;
1557 vfs_opterror(opts,
1558 "IPv6 addresses clash");
1559 goto done_deref_locked;
1560 }
1561 }
1562 }
1563 }
1564 #endif
1565 onamelen = namelen = 0;
1566 if (namelc != NULL) {
1567 /* Give a default name of the jid. Also allow the name to be
1568 * explicitly the jid - but not any other number, and only in
1569 * normal form (no leading zero/etc).
1570 */
1571 if (namelc[0] == '\0')
1572 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid);
1573 else if ((strtoul(namelc, &p, 10) != jid ||
1574 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') {
1575 error = EINVAL;
1576 vfs_opterror(opts,
1577 "name cannot be numeric (unless it is the jid)");
1578 goto done_deref_locked;
1579 }
1580 /*
1581 * Make sure the name isn't too long for the prison or its
1582 * children.
1583 */
1584 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1585 onamelen = strlen(pr->pr_name + pnamelen);
1586 namelen = strlen(namelc);
1587 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) {
1588 error = ENAMETOOLONG;
1589 goto done_deref_locked;
1590 }
1591 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1592 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
1593 sizeof(pr->pr_name)) {
1594 error = ENAMETOOLONG;
1595 goto done_deref_locked;
1596 }
1597 }
1598 }
1599 if (pr_allow & ~ppr->pr_allow) {
1600 error = EPERM;
1601 goto done_deref_locked;
1602 }
1603
1604 /*
1605 * Let modules check their parameters. This requires unlocking and
1606 * then re-locking the prison, but this is still a valid state as long
1607 * as allprison_lock remains xlocked.
1608 */
1609 mtx_unlock(&pr->pr_mtx);
1610 error = osd_jail_call(pr, PR_METHOD_CHECK, opts);
1611 if (error != 0) {
1612 prison_deref(pr, created
1613 ? PD_LIST_XLOCKED
1614 : PD_DEREF | PD_LIST_XLOCKED);
1615 goto done_releroot;
1616 }
1617 mtx_lock(&pr->pr_mtx);
1618
1619 /* At this point, all valid parameters should have been noted. */
1620 TAILQ_FOREACH(opt, opts, link) {
1621 if (!opt->seen && strcmp(opt->name, "errmsg")) {
1622 error = EINVAL;
1623 vfs_opterror(opts, "unknown parameter: %s", opt->name);
1624 goto done_deref_locked;
1625 }
1626 }
1627
1628 /* Set the parameters of the prison. */
1629 #ifdef INET
1630 redo_ip4 = 0;
1631 if (pr_flags & PR_IP4_USER) {
1632 pr->pr_flags |= PR_IP4;
1633 free(pr->pr_ip4, M_PRISON);
1634 pr->pr_ip4s = ip4s;
1635 pr->pr_ip4 = ip4;
1636 ip4 = NULL;
1637 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1638 #ifdef VIMAGE
1639 if (tpr->pr_flags & PR_VNET) {
1640 descend = 0;
1641 continue;
1642 }
1643 #endif
1644 if (prison_restrict_ip4(tpr, NULL)) {
1645 redo_ip4 = 1;
1646 descend = 0;
1647 }
1648 }
1649 }
1650 #endif
1651 #ifdef INET6
1652 redo_ip6 = 0;
1653 if (pr_flags & PR_IP6_USER) {
1654 pr->pr_flags |= PR_IP6;
1655 free(pr->pr_ip6, M_PRISON);
1656 pr->pr_ip6s = ip6s;
1657 pr->pr_ip6 = ip6;
1658 ip6 = NULL;
1659 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1660 #ifdef VIMAGE
1661 if (tpr->pr_flags & PR_VNET) {
1662 descend = 0;
1663 continue;
1664 }
1665 #endif
1666 if (prison_restrict_ip6(tpr, NULL)) {
1667 redo_ip6 = 1;
1668 descend = 0;
1669 }
1670 }
1671 }
1672 #endif
1673 if (gotslevel) {
1674 pr->pr_securelevel = slevel;
1675 /* Set all child jails to be at least this level. */
1676 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1677 if (tpr->pr_securelevel < slevel)
1678 tpr->pr_securelevel = slevel;
1679 }
1680 if (gotchildmax) {
1681 pr->pr_childmax = childmax;
1682 /* Set all child jails to under this limit. */
1683 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
1684 if (tpr->pr_childmax > childmax - level)
1685 tpr->pr_childmax = childmax > level
1686 ? childmax - level : 0;
1687 }
1688 if (gotenforce) {
1689 pr->pr_enforce_statfs = enforce;
1690 /* Pass this restriction on to the children. */
1691 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1692 if (tpr->pr_enforce_statfs < enforce)
1693 tpr->pr_enforce_statfs = enforce;
1694 }
1695 if (gotrsnum) {
1696 pr->pr_devfs_rsnum = rsnum;
1697 /* Pass this restriction on to the children. */
1698 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1699 tpr->pr_devfs_rsnum = rsnum;
1700 }
1701 if (namelc != NULL) {
1702 if (ppr == &prison0)
1703 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name));
1704 else
1705 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
1706 ppr->pr_name, namelc);
1707 /* Change this component of child names. */
1708 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1709 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
1710 strlen(tpr->pr_name + onamelen) + 1);
1711 bcopy(pr->pr_name, tpr->pr_name, namelen);
1712 }
1713 }
1714 if (path != NULL) {
1715 /* Try to keep a real-rooted full pathname. */
1716 if (fullpath_disabled && path[0] == '/' &&
1717 strcmp(mypr->pr_path, "/"))
1718 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s",
1719 mypr->pr_path, path);
1720 else
1721 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
1722 pr->pr_root = root;
1723 }
1724 if (PR_HOST & ch_flags & ~pr_flags) {
1725 if (pr->pr_flags & PR_HOST) {
1726 /*
1727 * Copy the parent's host info. As with pr_ip4 above,
1728 * the lack of a lock on the parent is not a problem;
1729 * it is always set with allprison_lock at least
1730 * shared, and is held exclusively here.
1731 */
1732 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
1733 sizeof(pr->pr_hostname));
1734 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
1735 sizeof(pr->pr_domainname));
1736 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
1737 sizeof(pr->pr_hostuuid));
1738 pr->pr_hostid = pr->pr_parent->pr_hostid;
1739 }
1740 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
1741 /* Set this prison, and any descendants without PR_HOST. */
1742 if (host != NULL)
1743 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
1744 if (domain != NULL)
1745 strlcpy(pr->pr_domainname, domain,
1746 sizeof(pr->pr_domainname));
1747 if (uuid != NULL)
1748 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
1749 if (gothid)
1750 pr->pr_hostid = hid;
1751 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1752 if (tpr->pr_flags & PR_HOST)
1753 descend = 0;
1754 else {
1755 if (host != NULL)
1756 strlcpy(tpr->pr_hostname,
1757 pr->pr_hostname,
1758 sizeof(tpr->pr_hostname));
1759 if (domain != NULL)
1760 strlcpy(tpr->pr_domainname,
1761 pr->pr_domainname,
1762 sizeof(tpr->pr_domainname));
1763 if (uuid != NULL)
1764 strlcpy(tpr->pr_hostuuid,
1765 pr->pr_hostuuid,
1766 sizeof(tpr->pr_hostuuid));
1767 if (gothid)
1768 tpr->pr_hostid = hid;
1769 }
1770 }
1771 }
1772 if ((tallow = ch_allow & ~pr_allow)) {
1773 /* Clear allow bits in all children. */
1774 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1775 tpr->pr_allow &= ~tallow;
1776 }
1777 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
1778 /*
1779 * Persistent prisons get an extra reference, and prisons losing their
1780 * persist flag lose that reference. Only do this for existing prisons
1781 * for now, so new ones will remain unseen until after the module
1782 * handlers have completed.
1783 */
1784 born = pr->pr_uref == 0;
1785 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) {
1786 if (pr_flags & PR_PERSIST) {
1787 pr->pr_ref++;
1788 pr->pr_uref++;
1789 } else {
1790 pr->pr_ref--;
1791 pr->pr_uref--;
1792 }
1793 }
1794 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
1795 mtx_unlock(&pr->pr_mtx);
1796
1797 #ifdef RACCT
1798 if (racct_enable && created)
1799 prison_racct_attach(pr);
1800 #endif
1801
1802 /* Locks may have prevented a complete restriction of child IP
1803 * addresses. If so, allocate some more memory and try again.
1804 */
1805 #ifdef INET
1806 while (redo_ip4) {
1807 ip4s = pr->pr_ip4s;
1808 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
1809 mtx_lock(&pr->pr_mtx);
1810 redo_ip4 = 0;
1811 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1812 #ifdef VIMAGE
1813 if (tpr->pr_flags & PR_VNET) {
1814 descend = 0;
1815 continue;
1816 }
1817 #endif
1818 if (prison_restrict_ip4(tpr, ip4)) {
1819 if (ip4 != NULL)
1820 ip4 = NULL;
1821 else
1822 redo_ip4 = 1;
1823 }
1824 }
1825 mtx_unlock(&pr->pr_mtx);
1826 }
1827 #endif
1828 #ifdef INET6
1829 while (redo_ip6) {
1830 ip6s = pr->pr_ip6s;
1831 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
1832 mtx_lock(&pr->pr_mtx);
1833 redo_ip6 = 0;
1834 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1835 #ifdef VIMAGE
1836 if (tpr->pr_flags & PR_VNET) {
1837 descend = 0;
1838 continue;
1839 }
1840 #endif
1841 if (prison_restrict_ip6(tpr, ip6)) {
1842 if (ip6 != NULL)
1843 ip6 = NULL;
1844 else
1845 redo_ip6 = 1;
1846 }
1847 }
1848 mtx_unlock(&pr->pr_mtx);
1849 }
1850 #endif
1851
1852 /* Let the modules do their work. */
1853 sx_downgrade(&allprison_lock);
1854 if (born) {
1855 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
1856 if (error) {
1857 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
1858 prison_deref(pr, created
1859 ? PD_LIST_SLOCKED
1860 : PD_DEREF | PD_LIST_SLOCKED);
1861 goto done_errmsg;
1862 }
1863 }
1864 error = osd_jail_call(pr, PR_METHOD_SET, opts);
1865 if (error) {
1866 if (born)
1867 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
1868 prison_deref(pr, created
1869 ? PD_LIST_SLOCKED
1870 : PD_DEREF | PD_LIST_SLOCKED);
1871 goto done_errmsg;
1872 }
1873
1874 /* Attach this process to the prison if requested. */
1875 if (flags & JAIL_ATTACH) {
1876 mtx_lock(&pr->pr_mtx);
1877 error = do_jail_attach(td, pr);
1878 if (error) {
1879 vfs_opterror(opts, "attach failed");
1880 if (!created)
1881 prison_deref(pr, PD_DEREF);
1882 goto done_errmsg;
1883 }
1884 }
1885
1886 #ifdef RACCT
1887 if (racct_enable && !created) {
1888 if (!(flags & JAIL_ATTACH))
1889 sx_sunlock(&allprison_lock);
1890 prison_racct_modify(pr);
1891 if (!(flags & JAIL_ATTACH))
1892 sx_slock(&allprison_lock);
1893 }
1894 #endif
1895
1896 td->td_retval[0] = pr->pr_id;
1897
1898 /*
1899 * Now that it is all there, drop the temporary reference from existing
1900 * prisons. Or add a reference to newly created persistent prisons
1901 * (which was not done earlier so that the prison would not be publicly
1902 * visible).
1903 */
1904 if (!created) {
1905 prison_deref(pr, (flags & JAIL_ATTACH)
1906 ? PD_DEREF
1907 : PD_DEREF | PD_LIST_SLOCKED);
1908 } else {
1909 if (pr_flags & PR_PERSIST) {
1910 mtx_lock(&pr->pr_mtx);
1911 pr->pr_ref++;
1912 pr->pr_uref++;
1913 mtx_unlock(&pr->pr_mtx);
1914 }
1915 if (!(flags & JAIL_ATTACH))
1916 sx_sunlock(&allprison_lock);
1917 }
1918
1919 goto done_free;
1920
1921 done_deref_locked:
1922 prison_deref(pr, created
1923 ? PD_LOCKED | PD_LIST_XLOCKED
1924 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
1925 goto done_releroot;
1926 done_unlock_list:
1927 sx_xunlock(&allprison_lock);
1928 done_releroot:
1929 if (root != NULL)
1930 vrele(root);
1931 done_errmsg:
1932 if (error) {
1933 if (vfs_getopt(opts, "errmsg", (void **)&errmsg,
1934 &errmsg_len) == 0 && errmsg_len > 0) {
1935 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
1936 if (optuio->uio_segflg == UIO_SYSSPACE)
1937 bcopy(errmsg,
1938 optuio->uio_iov[errmsg_pos].iov_base,
1939 errmsg_len);
1940 else
1941 copyout(errmsg,
1942 optuio->uio_iov[errmsg_pos].iov_base,
1943 errmsg_len);
1944 }
1945 }
1946 done_free:
1947 #ifdef INET
1948 free(ip4, M_PRISON);
1949 #endif
1950 #ifdef INET6
1951 free(ip6, M_PRISON);
1952 #endif
1953 if (g_path != NULL)
1954 free(g_path, M_TEMP);
1955 vfs_freeopts(opts);
1956 return (error);
1957 }
1958
1959
1960 /*
1961 * struct jail_get_args {
1962 * struct iovec *iovp;
1963 * unsigned int iovcnt;
1964 * int flags;
1965 * };
1966 */
1967 int
1968 sys_jail_get(struct thread *td, struct jail_get_args *uap)
1969 {
1970 struct uio *auio;
1971 int error;
1972
1973 /* Check that we have an even number of iovecs. */
1974 if (uap->iovcnt & 1)
1975 return (EINVAL);
1976
1977 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
1978 if (error)
1979 return (error);
1980 error = kern_jail_get(td, auio, uap->flags);
1981 if (error == 0)
1982 error = copyout(auio->uio_iov, uap->iovp,
1983 uap->iovcnt * sizeof (struct iovec));
1984 free(auio, M_IOV);
1985 return (error);
1986 }
1987
1988 int
1989 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
1990 {
1991 struct prison *pr, *mypr;
1992 struct vfsopt *opt;
1993 struct vfsoptlist *opts;
1994 char *errmsg, *name;
1995 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos;
1996
1997 if (flags & ~JAIL_GET_MASK)
1998 return (EINVAL);
1999
2000 /* Get the parameter list. */
2001 error = vfs_buildopts(optuio, &opts);
2002 if (error)
2003 return (error);
2004 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
2005 mypr = td->td_ucred->cr_prison;
2006
2007 /*
2008 * Find the prison specified by one of: lastjid, jid, name.
2009 */
2010 sx_slock(&allprison_lock);
2011 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
2012 if (error == 0) {
2013 TAILQ_FOREACH(pr, &allprison, pr_list) {
2014 if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
2015 mtx_lock(&pr->pr_mtx);
2016 if (pr->pr_ref > 0 &&
2017 (pr->pr_uref > 0 || (flags & JAIL_DYING)))
2018 break;
2019 mtx_unlock(&pr->pr_mtx);
2020 }
2021 }
2022 if (pr != NULL)
2023 goto found_prison;
2024 error = ENOENT;
2025 vfs_opterror(opts, "no jail after %d", jid);
2026 goto done_unlock_list;
2027 } else if (error != ENOENT)
2028 goto done_unlock_list;
2029
2030 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
2031 if (error == 0) {
2032 if (jid != 0) {
2033 pr = prison_find_child(mypr, jid);
2034 if (pr != NULL) {
2035 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
2036 mtx_unlock(&pr->pr_mtx);
2037 error = ENOENT;
2038 vfs_opterror(opts, "jail %d is dying",
2039 jid);
2040 goto done_unlock_list;
2041 }
2042 goto found_prison;
2043 }
2044 error = ENOENT;
2045 vfs_opterror(opts, "jail %d not found", jid);
2046 goto done_unlock_list;
2047 }
2048 } else if (error != ENOENT)
2049 goto done_unlock_list;
2050
2051 error = vfs_getopt(opts, "name", (void **)&name, &len);
2052 if (error == 0) {
2053 if (len == 0 || name[len - 1] != '\0') {
2054 error = EINVAL;
2055 goto done_unlock_list;
2056 }
2057 pr = prison_find_name(mypr, name);
2058 if (pr != NULL) {
2059 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
2060 mtx_unlock(&pr->pr_mtx);
2061 error = ENOENT;
2062 vfs_opterror(opts, "jail \"%s\" is dying",
2063 name);
2064 goto done_unlock_list;
2065 }
2066 goto found_prison;
2067 }
2068 error = ENOENT;
2069 vfs_opterror(opts, "jail \"%s\" not found", name);
2070 goto done_unlock_list;
2071 } else if (error != ENOENT)
2072 goto done_unlock_list;
2073
2074 vfs_opterror(opts, "no jail specified");
2075 error = ENOENT;
2076 goto done_unlock_list;
2077
2078 found_prison:
2079 /* Get the parameters of the prison. */
2080 pr->pr_ref++;
2081 locked = PD_LOCKED;
2082 td->td_retval[0] = pr->pr_id;
2083 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
2084 if (error != 0 && error != ENOENT)
2085 goto done_deref;
2086 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
2087 error = vfs_setopt(opts, "parent", &i, sizeof(i));
2088 if (error != 0 && error != ENOENT)
2089 goto done_deref;
2090 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
2091 if (error != 0 && error != ENOENT)
2092 goto done_deref;
2093 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
2094 sizeof(pr->pr_cpuset->cs_id));
2095 if (error != 0 && error != ENOENT)
2096 goto done_deref;
2097 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
2098 if (error != 0 && error != ENOENT)
2099 goto done_deref;
2100 #ifdef INET
2101 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
2102 pr->pr_ip4s * sizeof(*pr->pr_ip4));
2103 if (error != 0 && error != ENOENT)
2104 goto done_deref;
2105 #endif
2106 #ifdef INET6
2107 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
2108 pr->pr_ip6s * sizeof(*pr->pr_ip6));
2109 if (error != 0 && error != ENOENT)
2110 goto done_deref;
2111 #endif
2112 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
2113 sizeof(pr->pr_securelevel));
2114 if (error != 0 && error != ENOENT)
2115 goto done_deref;
2116 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
2117 sizeof(pr->pr_childcount));
2118 if (error != 0 && error != ENOENT)
2119 goto done_deref;
2120 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
2121 sizeof(pr->pr_childmax));
2122 if (error != 0 && error != ENOENT)
2123 goto done_deref;
2124 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
2125 if (error != 0 && error != ENOENT)
2126 goto done_deref;
2127 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
2128 if (error != 0 && error != ENOENT)
2129 goto done_deref;
2130 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
2131 if (error != 0 && error != ENOENT)
2132 goto done_deref;
2133 #ifdef COMPAT_FREEBSD32
2134 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
2135 uint32_t hid32 = pr->pr_hostid;
2136
2137 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
2138 } else
2139 #endif
2140 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
2141 sizeof(pr->pr_hostid));
2142 if (error != 0 && error != ENOENT)
2143 goto done_deref;
2144 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
2145 sizeof(pr->pr_enforce_statfs));
2146 if (error != 0 && error != ENOENT)
2147 goto done_deref;
2148 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
2149 sizeof(pr->pr_devfs_rsnum));
2150 if (error != 0 && error != ENOENT)
2151 goto done_deref;
2152 for (fi = 0; fi < nitems(pr_flag_names); fi++) {
2153 if (pr_flag_names[fi] == NULL)
2154 continue;
2155 i = (pr->pr_flags & (1 << fi)) ? 1 : 0;
2156 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i));
2157 if (error != 0 && error != ENOENT)
2158 goto done_deref;
2159 i = !i;
2160 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i));
2161 if (error != 0 && error != ENOENT)
2162 goto done_deref;
2163 }
2164 for (fi = 0; fi < nitems(pr_flag_jailsys); fi++) {
2165 i = pr->pr_flags &
2166 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
2167 i = pr_flag_jailsys[fi].disable &&
2168 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE
2169 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW
2170 : JAIL_SYS_INHERIT;
2171 error =
2172 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i));
2173 if (error != 0 && error != ENOENT)
2174 goto done_deref;
2175 }
2176 for (fi = 0; fi < nitems(pr_allow_names); fi++) {
2177 if (pr_allow_names[fi] == NULL)
2178 continue;
2179 i = (pr->pr_allow & (1 << fi)) ? 1 : 0;
2180 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i));
2181 if (error != 0 && error != ENOENT)
2182 goto done_deref;
2183 i = !i;
2184 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i));
2185 if (error != 0 && error != ENOENT)
2186 goto done_deref;
2187 }
2188 i = (pr->pr_uref == 0);
2189 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2190 if (error != 0 && error != ENOENT)
2191 goto done_deref;
2192 i = !i;
2193 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2194 if (error != 0 && error != ENOENT)
2195 goto done_deref;
2196 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate,
2197 sizeof(pr->pr_osreldate));
2198 if (error != 0 && error != ENOENT)
2199 goto done_deref;
2200 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease);
2201 if (error != 0 && error != ENOENT)
2202 goto done_deref;
2203
2204 /* Get the module parameters. */
2205 mtx_unlock(&pr->pr_mtx);
2206 locked = 0;
2207 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2208 if (error)
2209 goto done_deref;
2210 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
2211
2212 /* By now, all parameters should have been noted. */
2213 TAILQ_FOREACH(opt, opts, link) {
2214 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2215 error = EINVAL;
2216 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2217 goto done_errmsg;
2218 }
2219 }
2220
2221 /* Write the fetched parameters back to userspace. */
2222 error = 0;
2223 TAILQ_FOREACH(opt, opts, link) {
2224 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2225 pos = 2 * opt->pos + 1;
2226 optuio->uio_iov[pos].iov_len = opt->len;
2227 if (opt->value != NULL) {
2228 if (optuio->uio_segflg == UIO_SYSSPACE) {
2229 bcopy(opt->value,
2230 optuio->uio_iov[pos].iov_base,
2231 opt->len);
2232 } else {
2233 error = copyout(opt->value,
2234 optuio->uio_iov[pos].iov_base,
2235 opt->len);
2236 if (error)
2237 break;
2238 }
2239 }
2240 }
2241 }
2242 goto done_errmsg;
2243
2244 done_deref:
2245 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
2246 goto done_errmsg;
2247
2248 done_unlock_list:
2249 sx_sunlock(&allprison_lock);
2250 done_errmsg:
2251 if (error && errmsg_pos >= 0) {
2252 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2253 errmsg_pos = 2 * errmsg_pos + 1;
2254 if (errmsg_len > 0) {
2255 if (optuio->uio_segflg == UIO_SYSSPACE)
2256 bcopy(errmsg,
2257 optuio->uio_iov[errmsg_pos].iov_base,
2258 errmsg_len);
2259 else
2260 copyout(errmsg,
2261 optuio->uio_iov[errmsg_pos].iov_base,
2262 errmsg_len);
2263 }
2264 }
2265 vfs_freeopts(opts);
2266 return (error);
2267 }
2268
2269
2270 /*
2271 * struct jail_remove_args {
2272 * int jid;
2273 * };
2274 */
2275 int
2276 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
2277 {
2278 struct prison *pr, *cpr, *lpr, *tpr;
2279 int descend, error;
2280
2281 error = priv_check(td, PRIV_JAIL_REMOVE);
2282 if (error)
2283 return (error);
2284
2285 sx_xlock(&allprison_lock);
2286 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2287 if (pr == NULL) {
2288 sx_xunlock(&allprison_lock);
2289 return (EINVAL);
2290 }
2291
2292 /* Remove all descendants of this prison, then remove this prison. */
2293 pr->pr_ref++;
2294 if (!LIST_EMPTY(&pr->pr_children)) {
2295 mtx_unlock(&pr->pr_mtx);
2296 lpr = NULL;
2297 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
2298 mtx_lock(&cpr->pr_mtx);
2299 if (cpr->pr_ref > 0) {
2300 tpr = cpr;
2301 cpr->pr_ref++;
2302 } else {
2303 /* Already removed - do not do it again. */
2304 tpr = NULL;
2305 }
2306 mtx_unlock(&cpr->pr_mtx);
2307 if (lpr != NULL) {
2308 mtx_lock(&lpr->pr_mtx);
2309 prison_remove_one(lpr);
2310 sx_xlock(&allprison_lock);
2311 }
2312 lpr = tpr;
2313 }
2314 if (lpr != NULL) {
2315 mtx_lock(&lpr->pr_mtx);
2316 prison_remove_one(lpr);
2317 sx_xlock(&allprison_lock);
2318 }
2319 mtx_lock(&pr->pr_mtx);
2320 }
2321 prison_remove_one(pr);
2322 return (0);
2323 }
2324
2325 static void
2326 prison_remove_one(struct prison *pr)
2327 {
2328 struct proc *p;
2329 int deuref;
2330
2331 /* If the prison was persistent, it is not anymore. */
2332 deuref = 0;
2333 if (pr->pr_flags & PR_PERSIST) {
2334 pr->pr_ref--;
2335 deuref = PD_DEUREF;
2336 pr->pr_flags &= ~PR_PERSIST;
2337 }
2338
2339 /*
2340 * jail_remove added a reference. If that's the only one, remove
2341 * the prison now.
2342 */
2343 KASSERT(pr->pr_ref > 0,
2344 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
2345 if (pr->pr_ref == 1) {
2346 prison_deref(pr,
2347 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
2348 return;
2349 }
2350
2351 mtx_unlock(&pr->pr_mtx);
2352 sx_xunlock(&allprison_lock);
2353 /*
2354 * Kill all processes unfortunate enough to be attached to this prison.
2355 */
2356 sx_slock(&allproc_lock);
2357 LIST_FOREACH(p, &allproc, p_list) {
2358 PROC_LOCK(p);
2359 if (p->p_state != PRS_NEW && p->p_ucred &&
2360 p->p_ucred->cr_prison == pr)
2361 kern_psignal(p, SIGKILL);
2362 PROC_UNLOCK(p);
2363 }
2364 sx_sunlock(&allproc_lock);
2365 /* Remove the temporary reference added by jail_remove. */
2366 prison_deref(pr, deuref | PD_DEREF);
2367 }
2368
2369
2370 /*
2371 * struct jail_attach_args {
2372 * int jid;
2373 * };
2374 */
2375 int
2376 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
2377 {
2378 struct prison *pr;
2379 int error;
2380
2381 error = priv_check(td, PRIV_JAIL_ATTACH);
2382 if (error)
2383 return (error);
2384
2385 /*
2386 * Start with exclusive hold on allprison_lock to ensure that a possible
2387 * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove.
2388 * But then immediately downgrade it since we don't need to stop
2389 * readers.
2390 */
2391 sx_xlock(&allprison_lock);
2392 sx_downgrade(&allprison_lock);
2393 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2394 if (pr == NULL) {
2395 sx_sunlock(&allprison_lock);
2396 return (EINVAL);
2397 }
2398
2399 /*
2400 * Do not allow a process to attach to a prison that is not
2401 * considered to be "alive".
2402 */
2403 if (pr->pr_uref == 0) {
2404 mtx_unlock(&pr->pr_mtx);
2405 sx_sunlock(&allprison_lock);
2406 return (EINVAL);
2407 }
2408
2409 return (do_jail_attach(td, pr));
2410 }
2411
2412 static int
2413 do_jail_attach(struct thread *td, struct prison *pr)
2414 {
2415 struct proc *p;
2416 struct ucred *newcred, *oldcred;
2417 int error;
2418
2419 /*
2420 * XXX: Note that there is a slight race here if two threads
2421 * in the same privileged process attempt to attach to two
2422 * different jails at the same time. It is important for
2423 * user processes not to do this, or they might end up with
2424 * a process root from one prison, but attached to the jail
2425 * of another.
2426 */
2427 pr->pr_ref++;
2428 pr->pr_uref++;
2429 mtx_unlock(&pr->pr_mtx);
2430
2431 /* Let modules do whatever they need to prepare for attaching. */
2432 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
2433 if (error) {
2434 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
2435 return (error);
2436 }
2437 sx_sunlock(&allprison_lock);
2438
2439 /*
2440 * Reparent the newly attached process to this jail.
2441 */
2442 p = td->td_proc;
2443 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
2444 if (error)
2445 goto e_revert_osd;
2446
2447 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
2448 if ((error = change_dir(pr->pr_root, td)) != 0)
2449 goto e_unlock;
2450 #ifdef MAC
2451 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
2452 goto e_unlock;
2453 #endif
2454 VOP_UNLOCK(pr->pr_root, 0);
2455 if ((error = pwd_chroot(td, pr->pr_root)))
2456 goto e_revert_osd;
2457
2458 newcred = crget();
2459 PROC_LOCK(p);
2460 oldcred = crcopysafe(p, newcred);
2461 newcred->cr_prison = pr;
2462 proc_set_cred(p, newcred);
2463 setsugid(p);
2464 PROC_UNLOCK(p);
2465 #ifdef RACCT
2466 racct_proc_ucred_changed(p, oldcred, newcred);
2467 #endif
2468 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF);
2469 crfree(oldcred);
2470 return (0);
2471
2472 e_unlock:
2473 VOP_UNLOCK(pr->pr_root, 0);
2474 e_revert_osd:
2475 /* Tell modules this thread is still in its old jail after all. */
2476 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td);
2477 prison_deref(pr, PD_DEREF | PD_DEUREF);
2478 return (error);
2479 }
2480
2481
2482 /*
2483 * Returns a locked prison instance, or NULL on failure.
2484 */
2485 struct prison *
2486 prison_find(int prid)
2487 {
2488 struct prison *pr;
2489
2490 sx_assert(&allprison_lock, SX_LOCKED);
2491 TAILQ_FOREACH(pr, &allprison, pr_list) {
2492 if (pr->pr_id == prid) {
2493 mtx_lock(&pr->pr_mtx);
2494 if (pr->pr_ref > 0)
2495 return (pr);
2496 mtx_unlock(&pr->pr_mtx);
2497 }
2498 }
2499 return (NULL);
2500 }
2501
2502 /*
2503 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
2504 */
2505 struct prison *
2506 prison_find_child(struct prison *mypr, int prid)
2507 {
2508 struct prison *pr;
2509 int descend;
2510
2511 sx_assert(&allprison_lock, SX_LOCKED);
2512 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2513 if (pr->pr_id == prid) {
2514 mtx_lock(&pr->pr_mtx);
2515 if (pr->pr_ref > 0)
2516 return (pr);
2517 mtx_unlock(&pr->pr_mtx);
2518 }
2519 }
2520 return (NULL);
2521 }
2522
2523 /*
2524 * Look for the name relative to mypr. Returns a locked prison or NULL.
2525 */
2526 struct prison *
2527 prison_find_name(struct prison *mypr, const char *name)
2528 {
2529 struct prison *pr, *deadpr;
2530 size_t mylen;
2531 int descend;
2532
2533 sx_assert(&allprison_lock, SX_LOCKED);
2534 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
2535 again:
2536 deadpr = NULL;
2537 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2538 if (!strcmp(pr->pr_name + mylen, name)) {
2539 mtx_lock(&pr->pr_mtx);
2540 if (pr->pr_ref > 0) {
2541 if (pr->pr_uref > 0)
2542 return (pr);
2543 deadpr = pr;
2544 }
2545 mtx_unlock(&pr->pr_mtx);
2546 }
2547 }
2548 /* There was no valid prison - perhaps there was a dying one. */
2549 if (deadpr != NULL) {
2550 mtx_lock(&deadpr->pr_mtx);
2551 if (deadpr->pr_ref == 0) {
2552 mtx_unlock(&deadpr->pr_mtx);
2553 goto again;
2554 }
2555 }
2556 return (deadpr);
2557 }
2558
2559 /*
2560 * See if a prison has the specific flag set.
2561 */
2562 int
2563 prison_flag(struct ucred *cred, unsigned flag)
2564 {
2565
2566 /* This is an atomic read, so no locking is necessary. */
2567 return (cred->cr_prison->pr_flags & flag);
2568 }
2569
2570 int
2571 prison_allow(struct ucred *cred, unsigned flag)
2572 {
2573
2574 /* This is an atomic read, so no locking is necessary. */
2575 return (cred->cr_prison->pr_allow & flag);
2576 }
2577
2578 /*
2579 * Remove a prison reference. If that was the last reference, remove the
2580 * prison itself - but not in this context in case there are locks held.
2581 */
2582 void
2583 prison_free_locked(struct prison *pr)
2584 {
2585 int ref;
2586
2587 mtx_assert(&pr->pr_mtx, MA_OWNED);
2588 ref = --pr->pr_ref;
2589 mtx_unlock(&pr->pr_mtx);
2590 if (ref == 0)
2591 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2592 }
2593
2594 void
2595 prison_free(struct prison *pr)
2596 {
2597
2598 mtx_lock(&pr->pr_mtx);
2599 prison_free_locked(pr);
2600 }
2601
2602 /*
2603 * Complete a call to either prison_free or prison_proc_free.
2604 */
2605 static void
2606 prison_complete(void *context, int pending)
2607 {
2608 struct prison *pr = context;
2609
2610 sx_xlock(&allprison_lock);
2611 mtx_lock(&pr->pr_mtx);
2612 prison_deref(pr, pr->pr_uref
2613 ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED
2614 : PD_LOCKED | PD_LIST_XLOCKED);
2615 }
2616
2617 /*
2618 * Remove a prison reference (usually). This internal version assumes no
2619 * mutexes are held, except perhaps the prison itself. If there are no more
2620 * references, release and delist the prison. On completion, the prison lock
2621 * and the allprison lock are both unlocked.
2622 */
2623 static void
2624 prison_deref(struct prison *pr, int flags)
2625 {
2626 struct prison *ppr, *tpr;
2627 int ref, lasturef;
2628
2629 if (!(flags & PD_LOCKED))
2630 mtx_lock(&pr->pr_mtx);
2631 for (;;) {
2632 if (flags & PD_DEUREF) {
2633 KASSERT(pr->pr_uref > 0,
2634 ("prison_deref PD_DEUREF on a dead prison (jid=%d)",
2635 pr->pr_id));
2636 pr->pr_uref--;
2637 lasturef = pr->pr_uref == 0;
2638 if (lasturef)
2639 pr->pr_ref++;
2640 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0"));
2641 } else
2642 lasturef = 0;
2643 if (flags & PD_DEREF) {
2644 KASSERT(pr->pr_ref > 0,
2645 ("prison_deref PD_DEREF on a dead prison (jid=%d)",
2646 pr->pr_id));
2647 pr->pr_ref--;
2648 }
2649 ref = pr->pr_ref;
2650 mtx_unlock(&pr->pr_mtx);
2651
2652 /*
2653 * Tell the modules if the last user reference was removed
2654 * (even it sticks around in dying state).
2655 */
2656 if (lasturef) {
2657 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) {
2658 sx_xlock(&allprison_lock);
2659 flags |= PD_LIST_XLOCKED;
2660 }
2661 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
2662 mtx_lock(&pr->pr_mtx);
2663 ref = --pr->pr_ref;
2664 mtx_unlock(&pr->pr_mtx);
2665 }
2666
2667 /* If the prison still has references, nothing else to do. */
2668 if (ref > 0) {
2669 if (flags & PD_LIST_SLOCKED)
2670 sx_sunlock(&allprison_lock);
2671 else if (flags & PD_LIST_XLOCKED)
2672 sx_xunlock(&allprison_lock);
2673 return;
2674 }
2675
2676 if (flags & PD_LIST_SLOCKED) {
2677 if (!sx_try_upgrade(&allprison_lock)) {
2678 sx_sunlock(&allprison_lock);
2679 sx_xlock(&allprison_lock);
2680 }
2681 } else if (!(flags & PD_LIST_XLOCKED))
2682 sx_xlock(&allprison_lock);
2683
2684 TAILQ_REMOVE(&allprison, pr, pr_list);
2685 LIST_REMOVE(pr, pr_sibling);
2686 ppr = pr->pr_parent;
2687 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
2688 tpr->pr_childcount--;
2689 sx_xunlock(&allprison_lock);
2690
2691 #ifdef VIMAGE
2692 if (pr->pr_vnet != ppr->pr_vnet)
2693 vnet_destroy(pr->pr_vnet);
2694 #endif
2695 if (pr->pr_root != NULL)
2696 vrele(pr->pr_root);
2697 mtx_destroy(&pr->pr_mtx);
2698 #ifdef INET
2699 free(pr->pr_ip4, M_PRISON);
2700 #endif
2701 #ifdef INET6
2702 free(pr->pr_ip6, M_PRISON);
2703 #endif
2704 if (pr->pr_cpuset != NULL)
2705 cpuset_rel(pr->pr_cpuset);
2706 osd_jail_exit(pr);
2707 #ifdef RACCT
2708 if (racct_enable)
2709 prison_racct_detach(pr);
2710 #endif
2711 free(pr, M_PRISON);
2712
2713 /* Removing a prison frees a reference on its parent. */
2714 pr = ppr;
2715 mtx_lock(&pr->pr_mtx);
2716 flags = PD_DEREF | PD_DEUREF;
2717 }
2718 }
2719
2720 void
2721 prison_hold_locked(struct prison *pr)
2722 {
2723
2724 mtx_assert(&pr->pr_mtx, MA_OWNED);
2725 KASSERT(pr->pr_ref > 0,
2726 ("Trying to hold dead prison (jid=%d).", pr->pr_id));
2727 pr->pr_ref++;
2728 }
2729
2730 void
2731 prison_hold(struct prison *pr)
2732 {
2733
2734 mtx_lock(&pr->pr_mtx);
2735 prison_hold_locked(pr);
2736 mtx_unlock(&pr->pr_mtx);
2737 }
2738
2739 void
2740 prison_proc_hold(struct prison *pr)
2741 {
2742
2743 mtx_lock(&pr->pr_mtx);
2744 KASSERT(pr->pr_uref > 0,
2745 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
2746 pr->pr_uref++;
2747 mtx_unlock(&pr->pr_mtx);
2748 }
2749
2750 void
2751 prison_proc_free(struct prison *pr)
2752 {
2753
2754 mtx_lock(&pr->pr_mtx);
2755 KASSERT(pr->pr_uref > 0,
2756 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
2757 if (pr->pr_uref > 1)
2758 pr->pr_uref--;
2759 else {
2760 /*
2761 * Don't remove the last user reference in this context, which
2762 * is expected to be a process that is not only locked, but
2763 * also half dead.
2764 */
2765 pr->pr_ref++;
2766 mtx_unlock(&pr->pr_mtx);
2767 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2768 return;
2769 }
2770 mtx_unlock(&pr->pr_mtx);
2771 }
2772
2773
2774 #ifdef INET
2775 /*
2776 * Restrict a prison's IP address list with its parent's, possibly replacing
2777 * it. Return true if the replacement buffer was used (or would have been).
2778 */
2779 static int
2780 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
2781 {
2782 int ii, ij, used;
2783 struct prison *ppr;
2784
2785 ppr = pr->pr_parent;
2786 if (!(pr->pr_flags & PR_IP4_USER)) {
2787 /* This has no user settings, so just copy the parent's list. */
2788 if (pr->pr_ip4s < ppr->pr_ip4s) {
2789 /*
2790 * There's no room for the parent's list. Use the
2791 * new list buffer, which is assumed to be big enough
2792 * (if it was passed). If there's no buffer, try to
2793 * allocate one.
2794 */
2795 used = 1;
2796 if (newip4 == NULL) {
2797 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
2798 M_PRISON, M_NOWAIT);
2799 if (newip4 != NULL)
2800 used = 0;
2801 }
2802 if (newip4 != NULL) {
2803 bcopy(ppr->pr_ip4, newip4,
2804 ppr->pr_ip4s * sizeof(*newip4));
2805 free(pr->pr_ip4, M_PRISON);
2806 pr->pr_ip4 = newip4;
2807 pr->pr_ip4s = ppr->pr_ip4s;
2808 }
2809 return (used);
2810 }
2811 pr->pr_ip4s = ppr->pr_ip4s;
2812 if (pr->pr_ip4s > 0)
2813 bcopy(ppr->pr_ip4, pr->pr_ip4,
2814 pr->pr_ip4s * sizeof(*newip4));
2815 else if (pr->pr_ip4 != NULL) {
2816 free(pr->pr_ip4, M_PRISON);
2817 pr->pr_ip4 = NULL;
2818 }
2819 } else if (pr->pr_ip4s > 0) {
2820 /* Remove addresses that aren't in the parent. */
2821 for (ij = 0; ij < ppr->pr_ip4s; ij++)
2822 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
2823 break;
2824 if (ij < ppr->pr_ip4s)
2825 ii = 1;
2826 else {
2827 bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
2828 --pr->pr_ip4s * sizeof(*pr->pr_ip4));
2829 ii = 0;
2830 }
2831 for (ij = 1; ii < pr->pr_ip4s; ) {
2832 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
2833 ii++;
2834 continue;
2835 }
2836 switch (ij >= ppr->pr_ip4s ? -1 :
2837 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
2838 case -1:
2839 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
2840 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
2841 break;
2842 case 0:
2843 ii++;
2844 ij++;
2845 break;
2846 case 1:
2847 ij++;
2848 break;
2849 }
2850 }
2851 if (pr->pr_ip4s == 0) {
2852 free(pr->pr_ip4, M_PRISON);
2853 pr->pr_ip4 = NULL;
2854 }
2855 }
2856 return (0);
2857 }
2858
2859 /*
2860 * Pass back primary IPv4 address of this jail.
2861 *
2862 * If not restricted return success but do not alter the address. Caller has
2863 * to make sure to initialize it correctly (e.g. INADDR_ANY).
2864 *
2865 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2866 * Address returned in NBO.
2867 */
2868 int
2869 prison_get_ip4(struct ucred *cred, struct in_addr *ia)
2870 {
2871 struct prison *pr;
2872
2873 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2874 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2875
2876 pr = cred->cr_prison;
2877 if (!(pr->pr_flags & PR_IP4))
2878 return (0);
2879 mtx_lock(&pr->pr_mtx);
2880 if (!(pr->pr_flags & PR_IP4)) {
2881 mtx_unlock(&pr->pr_mtx);
2882 return (0);
2883 }
2884 if (pr->pr_ip4 == NULL) {
2885 mtx_unlock(&pr->pr_mtx);
2886 return (EAFNOSUPPORT);
2887 }
2888
2889 ia->s_addr = pr->pr_ip4[0].s_addr;
2890 mtx_unlock(&pr->pr_mtx);
2891 return (0);
2892 }
2893
2894 /*
2895 * Return 1 if we should do proper source address selection or are not jailed.
2896 * We will return 0 if we should bypass source address selection in favour
2897 * of the primary jail IPv4 address. Only in this case *ia will be updated and
2898 * returned in NBO.
2899 * Return EAFNOSUPPORT, in case this jail does not allow IPv4.
2900 */
2901 int
2902 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
2903 {
2904 struct prison *pr;
2905 struct in_addr lia;
2906 int error;
2907
2908 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2909 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2910
2911 if (!jailed(cred))
2912 return (1);
2913
2914 pr = cred->cr_prison;
2915 if (pr->pr_flags & PR_IP4_SADDRSEL)
2916 return (1);
2917
2918 lia.s_addr = INADDR_ANY;
2919 error = prison_get_ip4(cred, &lia);
2920 if (error)
2921 return (error);
2922 if (lia.s_addr == INADDR_ANY)
2923 return (1);
2924
2925 ia->s_addr = lia.s_addr;
2926 return (0);
2927 }
2928
2929 /*
2930 * Return true if pr1 and pr2 have the same IPv4 address restrictions.
2931 */
2932 int
2933 prison_equal_ip4(struct prison *pr1, struct prison *pr2)
2934 {
2935
2936 if (pr1 == pr2)
2937 return (1);
2938
2939 /*
2940 * No need to lock since the PR_IP4_USER flag can't be altered for
2941 * existing prisons.
2942 */
2943 while (pr1 != &prison0 &&
2944 #ifdef VIMAGE
2945 !(pr1->pr_flags & PR_VNET) &&
2946 #endif
2947 !(pr1->pr_flags & PR_IP4_USER))
2948 pr1 = pr1->pr_parent;
2949 while (pr2 != &prison0 &&
2950 #ifdef VIMAGE
2951 !(pr2->pr_flags & PR_VNET) &&
2952 #endif
2953 !(pr2->pr_flags & PR_IP4_USER))
2954 pr2 = pr2->pr_parent;
2955 return (pr1 == pr2);
2956 }
2957
2958 /*
2959 * Make sure our (source) address is set to something meaningful to this
2960 * jail.
2961 *
2962 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2963 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2964 * doesn't allow IPv4. Address passed in in NBO and returned in NBO.
2965 */
2966 int
2967 prison_local_ip4(struct ucred *cred, struct in_addr *ia)
2968 {
2969 struct prison *pr;
2970 struct in_addr ia0;
2971 int error;
2972
2973 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2974 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2975
2976 pr = cred->cr_prison;
2977 if (!(pr->pr_flags & PR_IP4))
2978 return (0);
2979 mtx_lock(&pr->pr_mtx);
2980 if (!(pr->pr_flags & PR_IP4)) {
2981 mtx_unlock(&pr->pr_mtx);
2982 return (0);
2983 }
2984 if (pr->pr_ip4 == NULL) {
2985 mtx_unlock(&pr->pr_mtx);
2986 return (EAFNOSUPPORT);
2987 }
2988
2989 ia0.s_addr = ntohl(ia->s_addr);
2990 if (ia0.s_addr == INADDR_LOOPBACK) {
2991 ia->s_addr = pr->pr_ip4[0].s_addr;
2992 mtx_unlock(&pr->pr_mtx);
2993 return (0);
2994 }
2995
2996 if (ia0.s_addr == INADDR_ANY) {
2997 /*
2998 * In case there is only 1 IPv4 address, bind directly.
2999 */
3000 if (pr->pr_ip4s == 1)
3001 ia->s_addr = pr->pr_ip4[0].s_addr;
3002 mtx_unlock(&pr->pr_mtx);
3003 return (0);
3004 }
3005
3006 error = _prison_check_ip4(pr, ia);
3007 mtx_unlock(&pr->pr_mtx);
3008 return (error);
3009 }
3010
3011 /*
3012 * Rewrite destination address in case we will connect to loopback address.
3013 *
3014 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
3015 * Address passed in in NBO and returned in NBO.
3016 */
3017 int
3018 prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
3019 {
3020 struct prison *pr;
3021
3022 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3023 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
3024
3025 pr = cred->cr_prison;
3026 if (!(pr->pr_flags & PR_IP4))
3027 return (0);
3028 mtx_lock(&pr->pr_mtx);
3029 if (!(pr->pr_flags & PR_IP4)) {
3030 mtx_unlock(&pr->pr_mtx);
3031 return (0);
3032 }
3033 if (pr->pr_ip4 == NULL) {
3034 mtx_unlock(&pr->pr_mtx);
3035 return (EAFNOSUPPORT);
3036 }
3037
3038 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) {
3039 ia->s_addr = pr->pr_ip4[0].s_addr;
3040 mtx_unlock(&pr->pr_mtx);
3041 return (0);
3042 }
3043
3044 /*
3045 * Return success because nothing had to be changed.
3046 */
3047 mtx_unlock(&pr->pr_mtx);
3048 return (0);
3049 }
3050
3051 /*
3052 * Check if given address belongs to the jail referenced by cred/prison.
3053 *
3054 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
3055 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3056 * doesn't allow IPv4. Address passed in in NBO.
3057 */
3058 static int
3059 _prison_check_ip4(const struct prison *pr, const struct in_addr *ia)
3060 {
3061 int i, a, z, d;
3062
3063 /*
3064 * Check the primary IP.
3065 */
3066 if (pr->pr_ip4[0].s_addr == ia->s_addr)
3067 return (0);
3068
3069 /*
3070 * All the other IPs are sorted so we can do a binary search.
3071 */
3072 a = 0;
3073 z = pr->pr_ip4s - 2;
3074 while (a <= z) {
3075 i = (a + z) / 2;
3076 d = qcmp_v4(&pr->pr_ip4[i+1], ia);
3077 if (d > 0)
3078 z = i - 1;
3079 else if (d < 0)
3080 a = i + 1;
3081 else
3082 return (0);
3083 }
3084
3085 return (EADDRNOTAVAIL);
3086 }
3087
3088 int
3089 prison_check_ip4(const struct ucred *cred, const struct in_addr *ia)
3090 {
3091 struct prison *pr;
3092 int error;
3093
3094 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3095 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
3096
3097 pr = cred->cr_prison;
3098 if (!(pr->pr_flags & PR_IP4))
3099 return (0);
3100 mtx_lock(&pr->pr_mtx);
3101 if (!(pr->pr_flags & PR_IP4)) {
3102 mtx_unlock(&pr->pr_mtx);
3103 return (0);
3104 }
3105 if (pr->pr_ip4 == NULL) {
3106 mtx_unlock(&pr->pr_mtx);
3107 return (EAFNOSUPPORT);
3108 }
3109
3110 error = _prison_check_ip4(pr, ia);
3111 mtx_unlock(&pr->pr_mtx);
3112 return (error);
3113 }
3114 #endif
3115
3116 #ifdef INET6
3117 static int
3118 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
3119 {
3120 int ii, ij, used;
3121 struct prison *ppr;
3122
3123 ppr = pr->pr_parent;
3124 if (!(pr->pr_flags & PR_IP6_USER)) {
3125 /* This has no user settings, so just copy the parent's list. */
3126 if (pr->pr_ip6s < ppr->pr_ip6s) {
3127 /*
3128 * There's no room for the parent's list. Use the
3129 * new list buffer, which is assumed to be big enough
3130 * (if it was passed). If there's no buffer, try to
3131 * allocate one.
3132 */
3133 used = 1;
3134 if (newip6 == NULL) {
3135 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
3136 M_PRISON, M_NOWAIT);
3137 if (newip6 != NULL)
3138 used = 0;
3139 }
3140 if (newip6 != NULL) {
3141 bcopy(ppr->pr_ip6, newip6,
3142 ppr->pr_ip6s * sizeof(*newip6));
3143 free(pr->pr_ip6, M_PRISON);
3144 pr->pr_ip6 = newip6;
3145 pr->pr_ip6s = ppr->pr_ip6s;
3146 }
3147 return (used);
3148 }
3149 pr->pr_ip6s = ppr->pr_ip6s;
3150 if (pr->pr_ip6s > 0)
3151 bcopy(ppr->pr_ip6, pr->pr_ip6,
3152 pr->pr_ip6s * sizeof(*newip6));
3153 else if (pr->pr_ip6 != NULL) {
3154 free(pr->pr_ip6, M_PRISON);
3155 pr->pr_ip6 = NULL;
3156 }
3157 } else if (pr->pr_ip6s > 0) {
3158 /* Remove addresses that aren't in the parent. */
3159 for (ij = 0; ij < ppr->pr_ip6s; ij++)
3160 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
3161 &ppr->pr_ip6[ij]))
3162 break;
3163 if (ij < ppr->pr_ip6s)
3164 ii = 1;
3165 else {
3166 bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
3167 --pr->pr_ip6s * sizeof(*pr->pr_ip6));
3168 ii = 0;
3169 }
3170 for (ij = 1; ii < pr->pr_ip6s; ) {
3171 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
3172 &ppr->pr_ip6[0])) {
3173 ii++;
3174 continue;
3175 }
3176 switch (ij >= ppr->pr_ip6s ? -1 :
3177 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
3178 case -1:
3179 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
3180 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
3181 break;
3182 case 0:
3183 ii++;
3184 ij++;
3185 break;
3186 case 1:
3187 ij++;
3188 break;
3189 }
3190 }
3191 if (pr->pr_ip6s == 0) {
3192 free(pr->pr_ip6, M_PRISON);
3193 pr->pr_ip6 = NULL;
3194 }
3195 }
3196 return 0;
3197 }
3198
3199 /*
3200 * Pass back primary IPv6 address for this jail.
3201 *
3202 * If not restricted return success but do not alter the address. Caller has
3203 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
3204 *
3205 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3206 */
3207 int
3208 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
3209 {
3210 struct prison *pr;
3211
3212 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3213 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3214
3215 pr = cred->cr_prison;
3216 if (!(pr->pr_flags & PR_IP6))
3217 return (0);
3218 mtx_lock(&pr->pr_mtx);
3219 if (!(pr->pr_flags & PR_IP6)) {
3220 mtx_unlock(&pr->pr_mtx);
3221 return (0);
3222 }
3223 if (pr->pr_ip6 == NULL) {
3224 mtx_unlock(&pr->pr_mtx);
3225 return (EAFNOSUPPORT);
3226 }
3227
3228 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3229 mtx_unlock(&pr->pr_mtx);
3230 return (0);
3231 }
3232
3233 /*
3234 * Return 1 if we should do proper source address selection or are not jailed.
3235 * We will return 0 if we should bypass source address selection in favour
3236 * of the primary jail IPv6 address. Only in this case *ia will be updated and
3237 * returned in NBO.
3238 * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
3239 */
3240 int
3241 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
3242 {
3243 struct prison *pr;
3244 struct in6_addr lia6;
3245 int error;
3246
3247 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3248 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3249
3250 if (!jailed(cred))
3251 return (1);
3252
3253 pr = cred->cr_prison;
3254 if (pr->pr_flags & PR_IP6_SADDRSEL)
3255 return (1);
3256
3257 lia6 = in6addr_any;
3258 error = prison_get_ip6(cred, &lia6);
3259 if (error)
3260 return (error);
3261 if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
3262 return (1);
3263
3264 bcopy(&lia6, ia6, sizeof(struct in6_addr));
3265 return (0);
3266 }
3267
3268 /*
3269 * Return true if pr1 and pr2 have the same IPv6 address restrictions.
3270 */
3271 int
3272 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
3273 {
3274
3275 if (pr1 == pr2)
3276 return (1);
3277
3278 while (pr1 != &prison0 &&
3279 #ifdef VIMAGE
3280 !(pr1->pr_flags & PR_VNET) &&
3281 #endif
3282 !(pr1->pr_flags & PR_IP6_USER))
3283 pr1 = pr1->pr_parent;
3284 while (pr2 != &prison0 &&
3285 #ifdef VIMAGE
3286 !(pr2->pr_flags & PR_VNET) &&
3287 #endif
3288 !(pr2->pr_flags & PR_IP6_USER))
3289 pr2 = pr2->pr_parent;
3290 return (pr1 == pr2);
3291 }
3292
3293 /*
3294 * Make sure our (source) address is set to something meaningful to this jail.
3295 *
3296 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
3297 * when needed while binding.
3298 *
3299 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3300 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3301 * doesn't allow IPv6.
3302 */
3303 int
3304 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
3305 {
3306 struct prison *pr;
3307 int error;
3308
3309 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3310 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3311
3312 pr = cred->cr_prison;
3313 if (!(pr->pr_flags & PR_IP6))
3314 return (0);
3315 mtx_lock(&pr->pr_mtx);
3316 if (!(pr->pr_flags & PR_IP6)) {
3317 mtx_unlock(&pr->pr_mtx);
3318 return (0);
3319 }
3320 if (pr->pr_ip6 == NULL) {
3321 mtx_unlock(&pr->pr_mtx);
3322 return (EAFNOSUPPORT);
3323 }
3324
3325 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3326 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3327 mtx_unlock(&pr->pr_mtx);
3328 return (0);
3329 }
3330
3331 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
3332 /*
3333 * In case there is only 1 IPv6 address, and v6only is true,
3334 * then bind directly.
3335 */
3336 if (v6only != 0 && pr->pr_ip6s == 1)
3337 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3338 mtx_unlock(&pr->pr_mtx);
3339 return (0);
3340 }
3341
3342 error = _prison_check_ip6(pr, ia6);
3343 mtx_unlock(&pr->pr_mtx);
3344 return (error);
3345 }
3346
3347 /*
3348 * Rewrite destination address in case we will connect to loopback address.
3349 *
3350 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3351 */
3352 int
3353 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
3354 {
3355 struct prison *pr;
3356
3357 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3358 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3359
3360 pr = cred->cr_prison;
3361 if (!(pr->pr_flags & PR_IP6))
3362 return (0);
3363 mtx_lock(&pr->pr_mtx);
3364 if (!(pr->pr_flags & PR_IP6)) {
3365 mtx_unlock(&pr->pr_mtx);
3366 return (0);
3367 }
3368 if (pr->pr_ip6 == NULL) {
3369 mtx_unlock(&pr->pr_mtx);
3370 return (EAFNOSUPPORT);
3371 }
3372
3373 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3374 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3375 mtx_unlock(&pr->pr_mtx);
3376 return (0);
3377 }
3378
3379 /*
3380 * Return success because nothing had to be changed.
3381 */
3382 mtx_unlock(&pr->pr_mtx);
3383 return (0);
3384 }
3385
3386 /*
3387 * Check if given address belongs to the jail referenced by cred/prison.
3388 *
3389 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3390 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3391 * doesn't allow IPv6.
3392 */
3393 static int
3394 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6)
3395 {
3396 int i, a, z, d;
3397
3398 /*
3399 * Check the primary IP.
3400 */
3401 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
3402 return (0);
3403
3404 /*
3405 * All the other IPs are sorted so we can do a binary search.
3406 */
3407 a = 0;
3408 z = pr->pr_ip6s - 2;
3409 while (a <= z) {
3410 i = (a + z) / 2;
3411 d = qcmp_v6(&pr->pr_ip6[i+1], ia6);
3412 if (d > 0)
3413 z = i - 1;
3414 else if (d < 0)
3415 a = i + 1;
3416 else
3417 return (0);
3418 }
3419
3420 return (EADDRNOTAVAIL);
3421 }
3422
3423 int
3424 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6)
3425 {
3426 struct prison *pr;
3427 int error;
3428
3429 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3430 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3431
3432 pr = cred->cr_prison;
3433 if (!(pr->pr_flags & PR_IP6))
3434 return (0);
3435 mtx_lock(&pr->pr_mtx);
3436 if (!(pr->pr_flags & PR_IP6)) {
3437 mtx_unlock(&pr->pr_mtx);
3438 return (0);
3439 }
3440 if (pr->pr_ip6 == NULL) {
3441 mtx_unlock(&pr->pr_mtx);
3442 return (EAFNOSUPPORT);
3443 }
3444
3445 error = _prison_check_ip6(pr, ia6);
3446 mtx_unlock(&pr->pr_mtx);
3447 return (error);
3448 }
3449 #endif
3450
3451 /*
3452 * Check if a jail supports the given address family.
3453 *
3454 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
3455 * if not.
3456 */
3457 int
3458 prison_check_af(struct ucred *cred, int af)
3459 {
3460 struct prison *pr;
3461 int error;
3462
3463 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3464
3465 pr = cred->cr_prison;
3466 #ifdef VIMAGE
3467 /* Prisons with their own network stack are not limited. */
3468 if (prison_owns_vnet(cred))
3469 return (0);
3470 #endif
3471
3472 error = 0;
3473 switch (af)
3474 {
3475 #ifdef INET
3476 case AF_INET:
3477 if (pr->pr_flags & PR_IP4)
3478 {
3479 mtx_lock(&pr->pr_mtx);
3480 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
3481 error = EAFNOSUPPORT;
3482 mtx_unlock(&pr->pr_mtx);
3483 }
3484 break;
3485 #endif
3486 #ifdef INET6
3487 case AF_INET6:
3488 if (pr->pr_flags & PR_IP6)
3489 {
3490 mtx_lock(&pr->pr_mtx);
3491 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
3492 error = EAFNOSUPPORT;
3493 mtx_unlock(&pr->pr_mtx);
3494 }
3495 break;
3496 #endif
3497 case AF_LOCAL:
3498 case AF_ROUTE:
3499 break;
3500 default:
3501 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
3502 error = EAFNOSUPPORT;
3503 }
3504 return (error);
3505 }
3506
3507 /*
3508 * Check if given address belongs to the jail referenced by cred (wrapper to
3509 * prison_check_ip[46]).
3510 *
3511 * Returns 0 if jail doesn't restrict the address family or if address belongs
3512 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
3513 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
3514 */
3515 int
3516 prison_if(struct ucred *cred, struct sockaddr *sa)
3517 {
3518 #ifdef INET
3519 struct sockaddr_in *sai;
3520 #endif
3521 #ifdef INET6
3522 struct sockaddr_in6 *sai6;
3523 #endif
3524 int error;
3525
3526 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3527 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
3528
3529 #ifdef VIMAGE
3530 if (prison_owns_vnet(cred))
3531 return (0);
3532 #endif
3533
3534 error = 0;
3535 switch (sa->sa_family)
3536 {
3537 #ifdef INET
3538 case AF_INET:
3539 sai = (struct sockaddr_in *)sa;
3540 error = prison_check_ip4(cred, &sai->sin_addr);
3541 break;
3542 #endif
3543 #ifdef INET6
3544 case AF_INET6:
3545 sai6 = (struct sockaddr_in6 *)sa;
3546 error = prison_check_ip6(cred, &sai6->sin6_addr);
3547 break;
3548 #endif
3549 default:
3550 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
3551 error = EAFNOSUPPORT;
3552 }
3553 return (error);
3554 }
3555
3556 /*
3557 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
3558 */
3559 int
3560 prison_check(struct ucred *cred1, struct ucred *cred2)
3561 {
3562
3563 return ((cred1->cr_prison == cred2->cr_prison ||
3564 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
3565 }
3566
3567 /*
3568 * Return 1 if p2 is a child of p1, otherwise 0.
3569 */
3570 int
3571 prison_ischild(struct prison *pr1, struct prison *pr2)
3572 {
3573
3574 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
3575 if (pr1 == pr2)
3576 return (1);
3577 return (0);
3578 }
3579
3580 /*
3581 * Return 1 if the passed credential is in a jail, otherwise 0.
3582 */
3583 int
3584 jailed(struct ucred *cred)
3585 {
3586
3587 return (cred->cr_prison != &prison0);
3588 }
3589
3590 /*
3591 * Return 1 if the passed credential is in a jail and that jail does not
3592 * have its own virtual network stack, otherwise 0.
3593 */
3594 int
3595 jailed_without_vnet(struct ucred *cred)
3596 {
3597
3598 if (!jailed(cred))
3599 return (0);
3600 #ifdef VIMAGE
3601 if (prison_owns_vnet(cred))
3602 return (0);
3603 #endif
3604
3605 return (1);
3606 }
3607
3608 /*
3609 * Return the correct hostname (domainname, et al) for the passed credential.
3610 */
3611 void
3612 getcredhostname(struct ucred *cred, char *buf, size_t size)
3613 {
3614 struct prison *pr;
3615
3616 /*
3617 * A NULL credential can be used to shortcut to the physical
3618 * system's hostname.
3619 */
3620 pr = (cred != NULL) ? cred->cr_prison : &prison0;
3621 mtx_lock(&pr->pr_mtx);
3622 strlcpy(buf, pr->pr_hostname, size);
3623 mtx_unlock(&pr->pr_mtx);
3624 }
3625
3626 void
3627 getcreddomainname(struct ucred *cred, char *buf, size_t size)
3628 {
3629
3630 mtx_lock(&cred->cr_prison->pr_mtx);
3631 strlcpy(buf, cred->cr_prison->pr_domainname, size);
3632 mtx_unlock(&cred->cr_prison->pr_mtx);
3633 }
3634
3635 void
3636 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
3637 {
3638
3639 mtx_lock(&cred->cr_prison->pr_mtx);
3640 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
3641 mtx_unlock(&cred->cr_prison->pr_mtx);
3642 }
3643
3644 void
3645 getcredhostid(struct ucred *cred, unsigned long *hostid)
3646 {
3647
3648 mtx_lock(&cred->cr_prison->pr_mtx);
3649 *hostid = cred->cr_prison->pr_hostid;
3650 mtx_unlock(&cred->cr_prison->pr_mtx);
3651 }
3652
3653 #ifdef VIMAGE
3654 /*
3655 * Determine whether the prison represented by cred owns
3656 * its vnet rather than having it inherited.
3657 *
3658 * Returns 1 in case the prison owns the vnet, 0 otherwise.
3659 */
3660 int
3661 prison_owns_vnet(struct ucred *cred)
3662 {
3663
3664 /*
3665 * vnets cannot be added/removed after jail creation,
3666 * so no need to lock here.
3667 */
3668 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
3669 }
3670 #endif
3671
3672 /*
3673 * Determine whether the subject represented by cred can "see"
3674 * status of a mount point.
3675 * Returns: 0 for permitted, ENOENT otherwise.
3676 * XXX: This function should be called cr_canseemount() and should be
3677 * placed in kern_prot.c.
3678 */
3679 int
3680 prison_canseemount(struct ucred *cred, struct mount *mp)
3681 {
3682 struct prison *pr;
3683 struct statfs *sp;
3684 size_t len;
3685
3686 pr = cred->cr_prison;
3687 if (pr->pr_enforce_statfs == 0)
3688 return (0);
3689 if (pr->pr_root->v_mount == mp)
3690 return (0);
3691 if (pr->pr_enforce_statfs == 2)
3692 return (ENOENT);
3693 /*
3694 * If jail's chroot directory is set to "/" we should be able to see
3695 * all mount-points from inside a jail.
3696 * This is ugly check, but this is the only situation when jail's
3697 * directory ends with '/'.
3698 */
3699 if (strcmp(pr->pr_path, "/") == 0)
3700 return (0);
3701 len = strlen(pr->pr_path);
3702 sp = &mp->mnt_stat;
3703 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
3704 return (ENOENT);
3705 /*
3706 * Be sure that we don't have situation where jail's root directory
3707 * is "/some/path" and mount point is "/some/pathpath".
3708 */
3709 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
3710 return (ENOENT);
3711 return (0);
3712 }
3713
3714 void
3715 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
3716 {
3717 char jpath[MAXPATHLEN];
3718 struct prison *pr;
3719 size_t len;
3720
3721 pr = cred->cr_prison;
3722 if (pr->pr_enforce_statfs == 0)
3723 return;
3724 if (prison_canseemount(cred, mp) != 0) {
3725 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3726 strlcpy(sp->f_mntonname, "[restricted]",
3727 sizeof(sp->f_mntonname));
3728 return;
3729 }
3730 if (pr->pr_root->v_mount == mp) {
3731 /*
3732 * Clear current buffer data, so we are sure nothing from
3733 * the valid path left there.
3734 */
3735 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3736 *sp->f_mntonname = '/';
3737 return;
3738 }
3739 /*
3740 * If jail's chroot directory is set to "/" we should be able to see
3741 * all mount-points from inside a jail.
3742 */
3743 if (strcmp(pr->pr_path, "/") == 0)
3744 return;
3745 len = strlen(pr->pr_path);
3746 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
3747 /*
3748 * Clear current buffer data, so we are sure nothing from
3749 * the valid path left there.
3750 */
3751 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3752 if (*jpath == '\0') {
3753 /* Should never happen. */
3754 *sp->f_mntonname = '/';
3755 } else {
3756 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
3757 }
3758 }
3759
3760 /*
3761 * Check with permission for a specific privilege is granted within jail. We
3762 * have a specific list of accepted privileges; the rest are denied.
3763 */
3764 int
3765 prison_priv_check(struct ucred *cred, int priv)
3766 {
3767
3768 if (!jailed(cred))
3769 return (0);
3770
3771 #ifdef VIMAGE
3772 /*
3773 * Privileges specific to prisons with a virtual network stack.
3774 * There might be a duplicate entry here in case the privilege
3775 * is only granted conditionally in the legacy jail case.
3776 */
3777 switch (priv) {
3778 #ifdef notyet
3779 /*
3780 * NFS-specific privileges.
3781 */
3782 case PRIV_NFS_DAEMON:
3783 case PRIV_NFS_LOCKD:
3784 #endif
3785 /*
3786 * Network stack privileges.
3787 */
3788 case PRIV_NET_BRIDGE:
3789 case PRIV_NET_GRE:
3790 case PRIV_NET_BPF:
3791 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
3792 case PRIV_NET_ROUTE:
3793 case PRIV_NET_TAP:
3794 case PRIV_NET_SETIFMTU:
3795 case PRIV_NET_SETIFFLAGS:
3796 case PRIV_NET_SETIFCAP:
3797 case PRIV_NET_SETIFDESCR:
3798 case PRIV_NET_SETIFNAME :
3799 case PRIV_NET_SETIFMETRIC:
3800 case PRIV_NET_SETIFPHYS:
3801 case PRIV_NET_SETIFMAC:
3802 case PRIV_NET_ADDMULTI:
3803 case PRIV_NET_DELMULTI:
3804 case PRIV_NET_HWIOCTL:
3805 case PRIV_NET_SETLLADDR:
3806 case PRIV_NET_ADDIFGROUP:
3807 case PRIV_NET_DELIFGROUP:
3808 case PRIV_NET_IFCREATE:
3809 case PRIV_NET_IFDESTROY:
3810 case PRIV_NET_ADDIFADDR:
3811 case PRIV_NET_DELIFADDR:
3812 case PRIV_NET_LAGG:
3813 case PRIV_NET_GIF:
3814 case PRIV_NET_SETIFVNET:
3815 case PRIV_NET_SETIFFIB:
3816
3817 /*
3818 * 802.11-related privileges.
3819 */
3820 case PRIV_NET80211_GETKEY:
3821 #ifdef notyet
3822 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */
3823 #endif
3824
3825 #ifdef notyet
3826 /*
3827 * ATM privileges.
3828 */
3829 case PRIV_NETATM_CFG:
3830 case PRIV_NETATM_ADD:
3831 case PRIV_NETATM_DEL:
3832 case PRIV_NETATM_SET:
3833
3834 /*
3835 * Bluetooth privileges.
3836 */
3837 case PRIV_NETBLUETOOTH_RAW:
3838 #endif
3839
3840 /*
3841 * Netgraph and netgraph module privileges.
3842 */
3843 case PRIV_NETGRAPH_CONTROL:
3844 #ifdef notyet
3845 case PRIV_NETGRAPH_TTY:
3846 #endif
3847
3848 /*
3849 * IPv4 and IPv6 privileges.
3850 */
3851 case PRIV_NETINET_IPFW:
3852 case PRIV_NETINET_DIVERT:
3853 case PRIV_NETINET_PF:
3854 case PRIV_NETINET_DUMMYNET:
3855 case PRIV_NETINET_CARP:
3856 case PRIV_NETINET_MROUTE:
3857 case PRIV_NETINET_RAW:
3858 case PRIV_NETINET_ADDRCTRL6:
3859 case PRIV_NETINET_ND6:
3860 case PRIV_NETINET_SCOPE6:
3861 case PRIV_NETINET_ALIFETIME6:
3862 case PRIV_NETINET_IPSEC:
3863 case PRIV_NETINET_BINDANY:
3864
3865 #ifdef notyet
3866 /*
3867 * NCP privileges.
3868 */
3869 case PRIV_NETNCP:
3870
3871 /*
3872 * SMB privileges.
3873 */
3874 case PRIV_NETSMB:
3875 #endif
3876
3877 /*
3878 * No default: or deny here.
3879 * In case of no permit fall through to next switch().
3880 */
3881 if (cred->cr_prison->pr_flags & PR_VNET)
3882 return (0);
3883 }
3884 #endif /* VIMAGE */
3885
3886 switch (priv) {
3887
3888 /*
3889 * Allow ktrace privileges for root in jail.
3890 */
3891 case PRIV_KTRACE:
3892
3893 #if 0
3894 /*
3895 * Allow jailed processes to configure audit identity and
3896 * submit audit records (login, etc). In the future we may
3897 * want to further refine the relationship between audit and
3898 * jail.
3899 */
3900 case PRIV_AUDIT_GETAUDIT:
3901 case PRIV_AUDIT_SETAUDIT:
3902 case PRIV_AUDIT_SUBMIT:
3903 #endif
3904
3905 /*
3906 * Allow jailed processes to manipulate process UNIX
3907 * credentials in any way they see fit.
3908 */
3909 case PRIV_CRED_SETUID:
3910 case PRIV_CRED_SETEUID:
3911 case PRIV_CRED_SETGID:
3912 case PRIV_CRED_SETEGID:
3913 case PRIV_CRED_SETGROUPS:
3914 case PRIV_CRED_SETREUID:
3915 case PRIV_CRED_SETREGID:
3916 case PRIV_CRED_SETRESUID:
3917 case PRIV_CRED_SETRESGID:
3918
3919 /*
3920 * Jail implements visibility constraints already, so allow
3921 * jailed root to override uid/gid-based constraints.
3922 */
3923 case PRIV_SEEOTHERGIDS:
3924 case PRIV_SEEOTHERUIDS:
3925
3926 /*
3927 * Jail implements inter-process debugging limits already, so
3928 * allow jailed root various debugging privileges.
3929 */
3930 case PRIV_DEBUG_DIFFCRED:
3931 case PRIV_DEBUG_SUGID:
3932 case PRIV_DEBUG_UNPRIV:
3933
3934 /*
3935 * Allow jail to set various resource limits and login
3936 * properties, and for now, exceed process resource limits.
3937 */
3938 case PRIV_PROC_LIMIT:
3939 case PRIV_PROC_SETLOGIN:
3940 case PRIV_PROC_SETRLIMIT:
3941
3942 /*
3943 * System V and POSIX IPC privileges are granted in jail.
3944 */
3945 case PRIV_IPC_READ:
3946 case PRIV_IPC_WRITE:
3947 case PRIV_IPC_ADMIN:
3948 case PRIV_IPC_MSGSIZE:
3949 case PRIV_MQ_ADMIN:
3950
3951 /*
3952 * Jail operations within a jail work on child jails.
3953 */
3954 case PRIV_JAIL_ATTACH:
3955 case PRIV_JAIL_SET:
3956 case PRIV_JAIL_REMOVE:
3957
3958 /*
3959 * Jail implements its own inter-process limits, so allow
3960 * root processes in jail to change scheduling on other
3961 * processes in the same jail. Likewise for signalling.
3962 */
3963 case PRIV_SCHED_DIFFCRED:
3964 case PRIV_SCHED_CPUSET:
3965 case PRIV_SIGNAL_DIFFCRED:
3966 case PRIV_SIGNAL_SUGID:
3967
3968 /*
3969 * Allow jailed processes to write to sysctls marked as jail
3970 * writable.
3971 */
3972 case PRIV_SYSCTL_WRITEJAIL:
3973
3974 /*
3975 * Allow root in jail to manage a variety of quota
3976 * properties. These should likely be conditional on a
3977 * configuration option.
3978 */
3979 case PRIV_VFS_GETQUOTA:
3980 case PRIV_VFS_SETQUOTA:
3981
3982 /*
3983 * Since Jail relies on chroot() to implement file system
3984 * protections, grant many VFS privileges to root in jail.
3985 * Be careful to exclude mount-related and NFS-related
3986 * privileges.
3987 */
3988 case PRIV_VFS_READ:
3989 case PRIV_VFS_WRITE:
3990 case PRIV_VFS_ADMIN:
3991 case PRIV_VFS_EXEC:
3992 case PRIV_VFS_LOOKUP:
3993 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
3994 case PRIV_VFS_CHFLAGS_DEV:
3995 case PRIV_VFS_CHOWN:
3996 case PRIV_VFS_CHROOT:
3997 case PRIV_VFS_RETAINSUGID:
3998 case PRIV_VFS_FCHROOT:
3999 case PRIV_VFS_LINK:
4000 case PRIV_VFS_SETGID:
4001 case PRIV_VFS_STAT:
4002 case PRIV_VFS_STICKYFILE:
4003
4004 /*
4005 * As in the non-jail case, non-root users are expected to be
4006 * able to read kernel/phyiscal memory (provided /dev/[k]mem
4007 * exists in the jail and they have permission to access it).
4008 */
4009 case PRIV_KMEM_READ:
4010 return (0);
4011
4012 /*
4013 * Depending on the global setting, allow privilege of
4014 * setting system flags.
4015 */
4016 case PRIV_VFS_SYSFLAGS:
4017 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
4018 return (0);
4019 else
4020 return (EPERM);
4021
4022 /*
4023 * Depending on the global setting, allow privilege of
4024 * mounting/unmounting file systems.
4025 */
4026 case PRIV_VFS_MOUNT:
4027 case PRIV_VFS_UNMOUNT:
4028 case PRIV_VFS_MOUNT_NONUSER:
4029 case PRIV_VFS_MOUNT_OWNER:
4030 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT &&
4031 cred->cr_prison->pr_enforce_statfs < 2)
4032 return (0);
4033 else
4034 return (EPERM);
4035
4036 /*
4037 * Allow jailed root to bind reserved ports and reuse in-use
4038 * ports.
4039 */
4040 case PRIV_NETINET_RESERVEDPORT:
4041 case PRIV_NETINET_REUSEPORT:
4042 return (0);
4043
4044 /*
4045 * Allow jailed root to set certain IPv4/6 (option) headers.
4046 */
4047 case PRIV_NETINET_SETHDROPTS:
4048 return (0);
4049
4050 /*
4051 * Conditionally allow creating raw sockets in jail.
4052 */
4053 case PRIV_NETINET_RAW:
4054 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
4055 return (0);
4056 else
4057 return (EPERM);
4058
4059 /*
4060 * Since jail implements its own visibility limits on netstat
4061 * sysctls, allow getcred. This allows identd to work in
4062 * jail.
4063 */
4064 case PRIV_NETINET_GETCRED:
4065 return (0);
4066
4067 /*
4068 * Allow jailed root to set loginclass.
4069 */
4070 case PRIV_PROC_SETLOGINCLASS:
4071 return (0);
4072
4073 default:
4074 /*
4075 * In all remaining cases, deny the privilege request. This
4076 * includes almost all network privileges, many system
4077 * configuration privileges.
4078 */
4079 return (EPERM);
4080 }
4081 }
4082
4083 /*
4084 * Return the part of pr2's name that is relative to pr1, or the whole name
4085 * if it does not directly follow.
4086 */
4087
4088 char *
4089 prison_name(struct prison *pr1, struct prison *pr2)
4090 {
4091 char *name;
4092
4093 /* Jails see themselves as "0" (if they see themselves at all). */
4094 if (pr1 == pr2)
4095 return "0";
4096 name = pr2->pr_name;
4097 if (prison_ischild(pr1, pr2)) {
4098 /*
4099 * pr1 isn't locked (and allprison_lock may not be either)
4100 * so its length can't be counted on. But the number of dots
4101 * can be counted on - and counted.
4102 */
4103 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
4104 name = strchr(name, '.') + 1;
4105 }
4106 return (name);
4107 }
4108
4109 /*
4110 * Return the part of pr2's path that is relative to pr1, or the whole path
4111 * if it does not directly follow.
4112 */
4113 static char *
4114 prison_path(struct prison *pr1, struct prison *pr2)
4115 {
4116 char *path1, *path2;
4117 int len1;
4118
4119 path1 = pr1->pr_path;
4120 path2 = pr2->pr_path;
4121 if (!strcmp(path1, "/"))
4122 return (path2);
4123 len1 = strlen(path1);
4124 if (strncmp(path1, path2, len1))
4125 return (path2);
4126 if (path2[len1] == '\0')
4127 return "/";
4128 if (path2[len1] == '/')
4129 return (path2 + len1);
4130 return (path2);
4131 }
4132
4133
4134 /*
4135 * Jail-related sysctls.
4136 */
4137 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
4138 "Jails");
4139
4140 static int
4141 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
4142 {
4143 struct xprison *xp;
4144 struct prison *pr, *cpr;
4145 #ifdef INET
4146 struct in_addr *ip4 = NULL;
4147 int ip4s = 0;
4148 #endif
4149 #ifdef INET6
4150 struct in6_addr *ip6 = NULL;
4151 int ip6s = 0;
4152 #endif
4153 int descend, error;
4154
4155 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
4156 pr = req->td->td_ucred->cr_prison;
4157 error = 0;
4158 sx_slock(&allprison_lock);
4159 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
4160 #if defined(INET) || defined(INET6)
4161 again:
4162 #endif
4163 mtx_lock(&cpr->pr_mtx);
4164 #ifdef INET
4165 if (cpr->pr_ip4s > 0) {
4166 if (ip4s < cpr->pr_ip4s) {
4167 ip4s = cpr->pr_ip4s;
4168 mtx_unlock(&cpr->pr_mtx);
4169 ip4 = realloc(ip4, ip4s *
4170 sizeof(struct in_addr), M_TEMP, M_WAITOK);
4171 goto again;
4172 }
4173 bcopy(cpr->pr_ip4, ip4,
4174 cpr->pr_ip4s * sizeof(struct in_addr));
4175 }
4176 #endif
4177 #ifdef INET6
4178 if (cpr->pr_ip6s > 0) {
4179 if (ip6s < cpr->pr_ip6s) {
4180 ip6s = cpr->pr_ip6s;
4181 mtx_unlock(&cpr->pr_mtx);
4182 ip6 = realloc(ip6, ip6s *
4183 sizeof(struct in6_addr), M_TEMP, M_WAITOK);
4184 goto again;
4185 }
4186 bcopy(cpr->pr_ip6, ip6,
4187 cpr->pr_ip6s * sizeof(struct in6_addr));
4188 }
4189 #endif
4190 if (cpr->pr_ref == 0) {
4191 mtx_unlock(&cpr->pr_mtx);
4192 continue;
4193 }
4194 bzero(xp, sizeof(*xp));
4195 xp->pr_version = XPRISON_VERSION;
4196 xp->pr_id = cpr->pr_id;
4197 xp->pr_state = cpr->pr_uref > 0
4198 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
4199 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
4200 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
4201 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
4202 #ifdef INET
4203 xp->pr_ip4s = cpr->pr_ip4s;
4204 #endif
4205 #ifdef INET6
4206 xp->pr_ip6s = cpr->pr_ip6s;
4207 #endif
4208 mtx_unlock(&cpr->pr_mtx);
4209 error = SYSCTL_OUT(req, xp, sizeof(*xp));
4210 if (error)
4211 break;
4212 #ifdef INET
4213 if (xp->pr_ip4s > 0) {
4214 error = SYSCTL_OUT(req, ip4,
4215 xp->pr_ip4s * sizeof(struct in_addr));
4216 if (error)
4217 break;
4218 }
4219 #endif
4220 #ifdef INET6
4221 if (xp->pr_ip6s > 0) {
4222 error = SYSCTL_OUT(req, ip6,
4223 xp->pr_ip6s * sizeof(struct in6_addr));
4224 if (error)
4225 break;
4226 }
4227 #endif
4228 }
4229 sx_sunlock(&allprison_lock);
4230 free(xp, M_TEMP);
4231 #ifdef INET
4232 free(ip4, M_TEMP);
4233 #endif
4234 #ifdef INET6
4235 free(ip6, M_TEMP);
4236 #endif
4237 return (error);
4238 }
4239
4240 SYSCTL_OID(_security_jail, OID_AUTO, list,
4241 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4242 sysctl_jail_list, "S", "List of active jails");
4243
4244 static int
4245 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
4246 {
4247 int error, injail;
4248
4249 injail = jailed(req->td->td_ucred);
4250 error = SYSCTL_OUT(req, &injail, sizeof(injail));
4251
4252 return (error);
4253 }
4254
4255 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
4256 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4257 sysctl_jail_jailed, "I", "Process in jail?");
4258
4259 static int
4260 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
4261 {
4262 int error, havevnet;
4263 #ifdef VIMAGE
4264 struct ucred *cred = req->td->td_ucred;
4265
4266 havevnet = jailed(cred) && prison_owns_vnet(cred);
4267 #else
4268 havevnet = 0;
4269 #endif
4270 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
4271
4272 return (error);
4273 }
4274
4275 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
4276 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4277 sysctl_jail_vnet, "I", "Jail owns VNET?");
4278
4279 #if defined(INET) || defined(INET6)
4280 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
4281 &jail_max_af_ips, 0,
4282 "Number of IP addresses a jail may have at most per address family (deprecated)");
4283 #endif
4284
4285 /*
4286 * Default parameters for jail(2) compatibility. For historical reasons,
4287 * the sysctl names have varying similarity to the parameter names. Prisons
4288 * just see their own parameters, and can't change them.
4289 */
4290 static int
4291 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
4292 {
4293 struct prison *pr;
4294 int allow, error, i;
4295
4296 pr = req->td->td_ucred->cr_prison;
4297 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
4298
4299 /* Get the current flag value, and convert it to a boolean. */
4300 i = (allow & arg2) ? 1 : 0;
4301 if (arg1 != NULL)
4302 i = !i;
4303 error = sysctl_handle_int(oidp, &i, 0, req);
4304 if (error || !req->newptr)
4305 return (error);
4306 i = i ? arg2 : 0;
4307 if (arg1 != NULL)
4308 i ^= arg2;
4309 /*
4310 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
4311 * for writing.
4312 */
4313 mtx_lock(&prison0.pr_mtx);
4314 jail_default_allow = (jail_default_allow & ~arg2) | i;
4315 mtx_unlock(&prison0.pr_mtx);
4316 return (0);
4317 }
4318
4319 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
4320 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4321 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
4322 "Processes in jail can set their hostnames (deprecated)");
4323 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
4324 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4325 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
4326 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)");
4327 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
4328 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4329 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
4330 "Processes in jail can use System V IPC primitives (deprecated)");
4331 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
4332 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4333 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
4334 "Prison root can create raw sockets (deprecated)");
4335 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
4336 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4337 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
4338 "Processes in jail can alter system file flags (deprecated)");
4339 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
4340 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4341 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
4342 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)");
4343 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed,
4344 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4345 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I",
4346 "Processes in jail can mount the devfs file system (deprecated)");
4347 SYSCTL_PROC(_security_jail, OID_AUTO, mount_fdescfs_allowed,
4348 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4349 NULL, PR_ALLOW_MOUNT_FDESCFS, sysctl_jail_default_allow, "I",
4350 "Processes in jail can mount the fdescfs file system (deprecated)");
4351 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed,
4352 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4353 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I",
4354 "Processes in jail can mount the nullfs file system (deprecated)");
4355 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed,
4356 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4357 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I",
4358 "Processes in jail can mount the procfs file system (deprecated)");
4359 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linprocfs_allowed,
4360 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4361 NULL, PR_ALLOW_MOUNT_LINPROCFS, sysctl_jail_default_allow, "I",
4362 "Processes in jail can mount the linprocfs file system (deprecated)");
4363 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linsysfs_allowed,
4364 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4365 NULL, PR_ALLOW_MOUNT_LINSYSFS, sysctl_jail_default_allow, "I",
4366 "Processes in jail can mount the linsysfs file system (deprecated)");
4367 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed,
4368 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4369 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I",
4370 "Processes in jail can mount the tmpfs file system (deprecated)");
4371 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed,
4372 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4373 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I",
4374 "Processes in jail can mount the zfs file system (deprecated)");
4375
4376 static int
4377 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
4378 {
4379 struct prison *pr;
4380 int level, error;
4381
4382 pr = req->td->td_ucred->cr_prison;
4383 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
4384 error = sysctl_handle_int(oidp, &level, 0, req);
4385 if (error || !req->newptr)
4386 return (error);
4387 *(int *)arg1 = level;
4388 return (0);
4389 }
4390
4391 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
4392 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4393 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
4394 sysctl_jail_default_level, "I",
4395 "Processes in jail cannot see all mounted file systems (deprecated)");
4396
4397 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
4398 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
4399 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
4400 sysctl_jail_default_level, "I",
4401 "Ruleset for the devfs filesystem in jail (deprecated)");
4402
4403 /*
4404 * Nodes to describe jail parameters. Maximum length of string parameters
4405 * is returned in the string itself, and the other parameters exist merely
4406 * to make themselves and their types known.
4407 */
4408 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0,
4409 "Jail parameters");
4410
4411 int
4412 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
4413 {
4414 int i;
4415 long l;
4416 size_t s;
4417 char numbuf[12];
4418
4419 switch (oidp->oid_kind & CTLTYPE)
4420 {
4421 case CTLTYPE_LONG:
4422 case CTLTYPE_ULONG:
4423 l = 0;
4424 #ifdef SCTL_MASK32
4425 if (!(req->flags & SCTL_MASK32))
4426 #endif
4427 return (SYSCTL_OUT(req, &l, sizeof(l)));
4428 case CTLTYPE_INT:
4429 case CTLTYPE_UINT:
4430 i = 0;
4431 return (SYSCTL_OUT(req, &i, sizeof(i)));
4432 case CTLTYPE_STRING:
4433 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
4434 return
4435 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
4436 case CTLTYPE_STRUCT:
4437 s = (size_t)arg2;
4438 return (SYSCTL_OUT(req, &s, sizeof(s)));
4439 }
4440 return (0);
4441 }
4442
4443 /*
4444 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at
4445 * jail creation time but cannot be changed in an existing jail.
4446 */
4447 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
4448 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
4449 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
4450 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
4451 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
4452 "I", "Jail secure level");
4453 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I",
4454 "Jail value for kern.osreldate and uname -K");
4455 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN,
4456 "Jail value for kern.osrelease and uname -r");
4457 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
4458 "I", "Jail cannot see all mounted file systems");
4459 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
4460 "I", "Ruleset for in-jail devfs mounts");
4461 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
4462 "B", "Jail persistence");
4463 #ifdef VIMAGE
4464 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
4465 "E,jailsys", "Virtual network stack");
4466 #endif
4467 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
4468 "B", "Jail is in the process of shutting down");
4469
4470 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
4471 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
4472 "I", "Current number of child jails");
4473 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
4474 "I", "Maximum number of child jails");
4475
4476 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
4477 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
4478 "Jail hostname");
4479 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
4480 "Jail NIS domainname");
4481 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
4482 "Jail host UUID");
4483 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
4484 "LU", "Jail host ID");
4485
4486 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
4487 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
4488
4489 #ifdef INET
4490 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
4491 "Jail IPv4 address virtualization");
4492 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
4493 "S,in_addr,a", "Jail IPv4 addresses");
4494 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4495 "B", "Do (not) use IPv4 source address selection rather than the "
4496 "primary jail IPv4 address.");
4497 #endif
4498 #ifdef INET6
4499 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
4500 "Jail IPv6 address virtualization");
4501 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
4502 "S,in6_addr,a", "Jail IPv6 addresses");
4503 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4504 "B", "Do (not) use IPv6 source address selection rather than the "
4505 "primary jail IPv6 address.");
4506 #endif
4507
4508 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
4509 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
4510 "B", "Jail may set hostname");
4511 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
4512 "B", "Jail may use SYSV IPC");
4513 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
4514 "B", "Jail may create raw sockets");
4515 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
4516 "B", "Jail may alter system file flags");
4517 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
4518 "B", "Jail may set file quotas");
4519 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
4520 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
4521
4522 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
4523 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
4524 "B", "Jail may mount/unmount jail-friendly file systems in general");
4525 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW,
4526 "B", "Jail may mount the devfs file system");
4527 SYSCTL_JAIL_PARAM(_allow_mount, fdescfs, CTLTYPE_INT | CTLFLAG_RW,
4528 "B", "Jail may mount the fdescfs file system");
4529 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW,
4530 "B", "Jail may mount the nullfs file system");
4531 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW,
4532 "B", "Jail may mount the procfs file system");
4533 SYSCTL_JAIL_PARAM(_allow_mount, linprocfs, CTLTYPE_INT | CTLFLAG_RW,
4534 "B", "Jail may mount the linprocfs file system");
4535 SYSCTL_JAIL_PARAM(_allow_mount, linsysfs, CTLTYPE_INT | CTLFLAG_RW,
4536 "B", "Jail may mount the linsysfs file system");
4537 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW,
4538 "B", "Jail may mount the tmpfs file system");
4539 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW,
4540 "B", "Jail may mount the zfs file system");
4541
4542 #ifdef RACCT
4543 void
4544 prison_racct_foreach(void (*callback)(struct racct *racct,
4545 void *arg2, void *arg3), void (*pre)(void), void (*post)(void),
4546 void *arg2, void *arg3)
4547 {
4548 struct prison_racct *prr;
4549
4550 ASSERT_RACCT_ENABLED();
4551
4552 sx_slock(&allprison_lock);
4553 if (pre != NULL)
4554 (pre)();
4555 LIST_FOREACH(prr, &allprison_racct, prr_next)
4556 (callback)(prr->prr_racct, arg2, arg3);
4557 if (post != NULL)
4558 (post)();
4559 sx_sunlock(&allprison_lock);
4560 }
4561
4562 static struct prison_racct *
4563 prison_racct_find_locked(const char *name)
4564 {
4565 struct prison_racct *prr;
4566
4567 ASSERT_RACCT_ENABLED();
4568 sx_assert(&allprison_lock, SA_XLOCKED);
4569
4570 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
4571 return (NULL);
4572
4573 LIST_FOREACH(prr, &allprison_racct, prr_next) {
4574 if (strcmp(name, prr->prr_name) != 0)
4575 continue;
4576
4577 /* Found prison_racct with a matching name? */
4578 prison_racct_hold(prr);
4579 return (prr);
4580 }
4581
4582 /* Add new prison_racct. */
4583 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
4584 racct_create(&prr->prr_racct);
4585
4586 strcpy(prr->prr_name, name);
4587 refcount_init(&prr->prr_refcount, 1);
4588 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
4589
4590 return (prr);
4591 }
4592
4593 struct prison_racct *
4594 prison_racct_find(const char *name)
4595 {
4596 struct prison_racct *prr;
4597
4598 ASSERT_RACCT_ENABLED();
4599
4600 sx_xlock(&allprison_lock);
4601 prr = prison_racct_find_locked(name);
4602 sx_xunlock(&allprison_lock);
4603 return (prr);
4604 }
4605
4606 void
4607 prison_racct_hold(struct prison_racct *prr)
4608 {
4609
4610 ASSERT_RACCT_ENABLED();
4611
4612 refcount_acquire(&prr->prr_refcount);
4613 }
4614
4615 static void
4616 prison_racct_free_locked(struct prison_racct *prr)
4617 {
4618
4619 ASSERT_RACCT_ENABLED();
4620 sx_assert(&allprison_lock, SA_XLOCKED);
4621
4622 if (refcount_release(&prr->prr_refcount)) {
4623 racct_destroy(&prr->prr_racct);
4624 LIST_REMOVE(prr, prr_next);
4625 free(prr, M_PRISON_RACCT);
4626 }
4627 }
4628
4629 void
4630 prison_racct_free(struct prison_racct *prr)
4631 {
4632 int old;
4633
4634 ASSERT_RACCT_ENABLED();
4635 sx_assert(&allprison_lock, SA_UNLOCKED);
4636
4637 old = prr->prr_refcount;
4638 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1))
4639 return;
4640
4641 sx_xlock(&allprison_lock);
4642 prison_racct_free_locked(prr);
4643 sx_xunlock(&allprison_lock);
4644 }
4645
4646 static void
4647 prison_racct_attach(struct prison *pr)
4648 {
4649 struct prison_racct *prr;
4650
4651 ASSERT_RACCT_ENABLED();
4652 sx_assert(&allprison_lock, SA_XLOCKED);
4653
4654 prr = prison_racct_find_locked(pr->pr_name);
4655 KASSERT(prr != NULL, ("cannot find prison_racct"));
4656
4657 pr->pr_prison_racct = prr;
4658 }
4659
4660 /*
4661 * Handle jail renaming. From the racct point of view, renaming means
4662 * moving from one prison_racct to another.
4663 */
4664 static void
4665 prison_racct_modify(struct prison *pr)
4666 {
4667 struct proc *p;
4668 struct ucred *cred;
4669 struct prison_racct *oldprr;
4670
4671 ASSERT_RACCT_ENABLED();
4672
4673 sx_slock(&allproc_lock);
4674 sx_xlock(&allprison_lock);
4675
4676 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
4677 sx_xunlock(&allprison_lock);
4678 sx_sunlock(&allproc_lock);
4679 return;
4680 }
4681
4682 oldprr = pr->pr_prison_racct;
4683 pr->pr_prison_racct = NULL;
4684
4685 prison_racct_attach(pr);
4686
4687 /*
4688 * Move resource utilisation records.
4689 */
4690 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
4691
4692 /*
4693 * Force rctl to reattach rules to processes.
4694 */
4695 FOREACH_PROC_IN_SYSTEM(p) {
4696 PROC_LOCK(p);
4697 cred = crhold(p->p_ucred);
4698 PROC_UNLOCK(p);
4699 racct_proc_ucred_changed(p, cred, cred);
4700 crfree(cred);
4701 }
4702
4703 sx_sunlock(&allproc_lock);
4704 prison_racct_free_locked(oldprr);
4705 sx_xunlock(&allprison_lock);
4706 }
4707
4708 static void
4709 prison_racct_detach(struct prison *pr)
4710 {
4711
4712 ASSERT_RACCT_ENABLED();
4713 sx_assert(&allprison_lock, SA_UNLOCKED);
4714
4715 if (pr->pr_prison_racct == NULL)
4716 return;
4717 prison_racct_free(pr->pr_prison_racct);
4718 pr->pr_prison_racct = NULL;
4719 }
4720 #endif /* RACCT */
4721
4722 #ifdef DDB
4723
4724 static void
4725 db_show_prison(struct prison *pr)
4726 {
4727 int fi;
4728 #if defined(INET) || defined(INET6)
4729 int ii;
4730 #endif
4731 unsigned jsf;
4732 #ifdef INET6
4733 char ip6buf[INET6_ADDRSTRLEN];
4734 #endif
4735
4736 db_printf("prison %p:\n", pr);
4737 db_printf(" jid = %d\n", pr->pr_id);
4738 db_printf(" name = %s\n", pr->pr_name);
4739 db_printf(" parent = %p\n", pr->pr_parent);
4740 db_printf(" ref = %d\n", pr->pr_ref);
4741 db_printf(" uref = %d\n", pr->pr_uref);
4742 db_printf(" path = %s\n", pr->pr_path);
4743 db_printf(" cpuset = %d\n", pr->pr_cpuset
4744 ? pr->pr_cpuset->cs_id : -1);
4745 #ifdef VIMAGE
4746 db_printf(" vnet = %p\n", pr->pr_vnet);
4747 #endif
4748 db_printf(" root = %p\n", pr->pr_root);
4749 db_printf(" securelevel = %d\n", pr->pr_securelevel);
4750 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
4751 db_printf(" children.max = %d\n", pr->pr_childmax);
4752 db_printf(" children.cur = %d\n", pr->pr_childcount);
4753 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
4754 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
4755 db_printf(" flags = 0x%x", pr->pr_flags);
4756 for (fi = 0; fi < nitems(pr_flag_names); fi++)
4757 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi)))
4758 db_printf(" %s", pr_flag_names[fi]);
4759 for (fi = 0; fi < nitems(pr_flag_jailsys); fi++) {
4760 jsf = pr->pr_flags &
4761 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
4762 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name,
4763 pr_flag_jailsys[fi].disable &&
4764 (jsf == pr_flag_jailsys[fi].disable) ? "disable"
4765 : (jsf == pr_flag_jailsys[fi].new) ? "new"
4766 : "inherit");
4767 }
4768 db_printf(" allow = 0x%x", pr->pr_allow);
4769 for (fi = 0; fi < nitems(pr_allow_names); fi++)
4770 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi)))
4771 db_printf(" %s", pr_allow_names[fi]);
4772 db_printf("\n");
4773 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
4774 db_printf(" host.hostname = %s\n", pr->pr_hostname);
4775 db_printf(" host.domainname = %s\n", pr->pr_domainname);
4776 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
4777 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
4778 #ifdef INET
4779 db_printf(" ip4s = %d\n", pr->pr_ip4s);
4780 for (ii = 0; ii < pr->pr_ip4s; ii++)
4781 db_printf(" %s %s\n",
4782 ii == 0 ? "ip4.addr =" : " ",
4783 inet_ntoa(pr->pr_ip4[ii]));
4784 #endif
4785 #ifdef INET6
4786 db_printf(" ip6s = %d\n", pr->pr_ip6s);
4787 for (ii = 0; ii < pr->pr_ip6s; ii++)
4788 db_printf(" %s %s\n",
4789 ii == 0 ? "ip6.addr =" : " ",
4790 ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
4791 #endif
4792 }
4793
4794 DB_SHOW_COMMAND(prison, db_show_prison_command)
4795 {
4796 struct prison *pr;
4797
4798 if (!have_addr) {
4799 /*
4800 * Show all prisons in the list, and prison0 which is not
4801 * listed.
4802 */
4803 db_show_prison(&prison0);
4804 if (!db_pager_quit) {
4805 TAILQ_FOREACH(pr, &allprison, pr_list) {
4806 db_show_prison(pr);
4807 if (db_pager_quit)
4808 break;
4809 }
4810 }
4811 return;
4812 }
4813
4814 if (addr == 0)
4815 pr = &prison0;
4816 else {
4817 /* Look for a prison with the ID and with references. */
4818 TAILQ_FOREACH(pr, &allprison, pr_list)
4819 if (pr->pr_id == addr && pr->pr_ref > 0)
4820 break;
4821 if (pr == NULL)
4822 /* Look again, without requiring a reference. */
4823 TAILQ_FOREACH(pr, &allprison, pr_list)
4824 if (pr->pr_id == addr)
4825 break;
4826 if (pr == NULL)
4827 /* Assume address points to a valid prison. */
4828 pr = (struct prison *)addr;
4829 }
4830 db_show_prison(pr);
4831 }
4832
4833 #endif /* DDB */
FreeBSD src