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