1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1999 Poul-Henning Kamp.
5 * Copyright (c) 2008 Bjoern A. Zeeb.
6 * Copyright (c) 2009 James Gritton.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 #include "opt_ddb.h"
33 #include "opt_inet.h"
34 #include "opt_inet6.h"
35 #include "opt_nfs.h"
36
37 #include <sys/param.h>
38 #include <sys/types.h>
39 #include <sys/ctype.h>
40 #include <sys/kernel.h>
41 #include <sys/systm.h>
42 #include <sys/errno.h>
43 #include <sys/file.h>
44 #include <sys/sysproto.h>
45 #include <sys/malloc.h>
46 #include <sys/osd.h>
47 #include <sys/priv.h>
48 #include <sys/proc.h>
49 #include <sys/epoch.h>
50 #include <sys/event.h>
51 #include <sys/taskqueue.h>
52 #include <sys/fcntl.h>
53 #include <sys/jail.h>
54 #include <sys/jaildesc.h>
55 #include <sys/linker.h>
56 #include <sys/lock.h>
57 #include <sys/mman.h>
58 #include <sys/mutex.h>
59 #include <sys/racct.h>
60 #include <sys/rctl.h>
61 #include <sys/refcount.h>
62 #include <sys/sx.h>
63 #include <sys/sysent.h>
64 #include <sys/namei.h>
65 #include <sys/mount.h>
66 #include <sys/queue.h>
67 #include <sys/socket.h>
68 #include <sys/syscallsubr.h>
69 #include <sys/sysctl.h>
70 #include <sys/uuid.h>
71 #include <sys/vnode.h>
72
73 #include <net/if.h>
74 #include <net/vnet.h>
75
76 #include <netinet/in.h>
77
78 #ifdef DDB
79 #include <ddb/ddb.h>
80 #endif /* DDB */
81
82 #include <security/mac/mac_framework.h>
83 #include <security/mac/mac_policy.h>
84 #include <security/mac/mac_syscalls.h>
85
86 #define PRISON0_HOSTUUID_MODULE "hostuuid"
87
88 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
89 #ifdef RACCT
90 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures");
91 #endif
92
93 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */
94 #ifdef INET
95 #ifdef INET6
96 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
97 #else
98 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
99 #endif
100 #else /* !INET */
101 #ifdef INET6
102 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
103 #else
104 #define _PR_IP_SADDRSEL 0
105 #endif
106 #endif
107
108 /* prison0 describes what is "real" about the system. */
109 struct prison prison0 = {
110 .pr_id = 0,
111 .pr_name = "0",
112 .pr_ref = 1,
113 .pr_uref = 1,
114 .pr_path = "/",
115 .pr_securelevel = -1,
116 .pr_devfs_rsnum = 0,
117 .pr_state = PRISON_STATE_ALIVE,
118 .pr_childmax = JAIL_MAX,
119 .pr_hostuuid = DEFAULT_HOSTUUID,
120 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
121 #ifdef VIMAGE
122 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
123 #else
124 .pr_flags = PR_HOST|_PR_IP_SADDRSEL,
125 #endif
126 .pr_allow = PR_ALLOW_PRISON0,
127 };
128 _Static_assert((PR_ALLOW_PRISON0 & ~PR_ALLOW_ALL_STATIC) == 0,
129 "Bits enabled in PR_ALLOW_PRISON0 that are not statically reserved");
130
131 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
132
133 struct bool_flags {
134 const char *name;
135 const char *noname;
136 volatile u_int flag;
137 };
138 struct jailsys_flags {
139 const char *name;
140 unsigned disable;
141 unsigned new;
142 };
143
144 /*
145 * Handle jail teardown in a dedicated thread to avoid deadlocks from
146 * vnet_destroy().
147 */
148 TASKQUEUE_DEFINE_THREAD(jail_remove);
149
150 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */
151 struct sx allprison_lock;
152 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
153 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
154 LIST_HEAD(, prison_racct) allprison_racct;
155 int lastprid = 0;
156 int lastdeadid = 0;
157
158 static int get_next_prid(struct prison **insprp);
159 static int get_next_deadid(struct prison **insprp);
160 static int do_jail_attach(struct thread *td, struct prison *pr, int drflags);
161 static void prison_complete(void *context, int pending);
162 static void prison_deref(struct prison *pr, int flags);
163 static void prison_deref_kill(struct prison *pr, struct prisonlist *freeprison);
164 static int prison_lock_xlock(struct prison *pr, int flags);
165 static void prison_cleanup_locked(struct prison *pr);
166 static void prison_cleanup_unlocked(struct prison *pr);
167 static void prison_free_not_last(struct prison *pr);
168 static void prison_proc_free_not_last(struct prison *pr);
169 static void prison_proc_relink(struct prison *opr, struct prison *npr,
170 struct proc *p);
171 static void prison_set_allow_locked(struct prison *pr, unsigned flag,
172 int enable);
173 static char *prison_path(struct prison *pr1, struct prison *pr2);
174 #ifdef RACCT
175 static void prison_racct_attach(struct prison *pr);
176 static void prison_racct_modify(struct prison *pr);
177 static void prison_racct_detach(struct prison *pr);
178 #endif
179 static void prison_knote(struct prison *pr, long hint);
180
181 /* Flags for prison_deref */
182 #define PD_DEREF 0x01 /* Decrement pr_ref */
183 #define PD_DEUREF 0x02 /* Decrement pr_uref */
184 #define PD_KILL 0x04 /* Remove jail, kill processes, etc */
185 #define PD_LOCKED 0x10 /* pr_mtx is held */
186 #define PD_LIST_SLOCKED 0x20 /* allprison_lock is held shared */
187 #define PD_LIST_XLOCKED 0x40 /* allprison_lock is held exclusive */
188 #define PD_OP_FLAGS 0x07 /* Operation flags */
189 #define PD_LOCK_FLAGS 0x70 /* Lock status flags */
190
191 /*
192 * Parameter names corresponding to PR_* flag values. Size values are for kvm
193 * as we cannot figure out the size of a sparse array, or an array without a
194 * terminating entry.
195 */
196 static struct bool_flags pr_flag_bool[] = {
197 {"persist", "nopersist", PR_PERSIST},
198 #ifdef INET
199 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL},
200 #endif
201 #ifdef INET6
202 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL},
203 #endif
204 };
205 const size_t pr_flag_bool_size = sizeof(pr_flag_bool);
206
207 static struct jailsys_flags pr_flag_jailsys[] = {
208 {"host", 0, PR_HOST},
209 #ifdef VIMAGE
210 {"vnet", 0, PR_VNET},
211 #endif
212 #ifdef INET
213 {"ip4", PR_IP4_USER, PR_IP4_USER},
214 #endif
215 #ifdef INET6
216 {"ip6", PR_IP6_USER, PR_IP6_USER},
217 #endif
218 };
219 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
220
221 /*
222 * Make this array full-size so dynamic parameters can be added.
223 * It is protected by prison0.mtx, but lockless reading is allowed
224 * with an atomic check of the flag values.
225 */
226 static struct bool_flags pr_flag_allow[NBBY * NBPW] = {
227 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME},
228 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC},
229 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS},
230 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS},
231 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT},
232 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS},
233 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF},
234 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK},
235 {"allow.reserved_ports", "allow.noreserved_ports",
236 PR_ALLOW_RESERVED_PORTS},
237 {"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF},
238 {"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug",
239 PR_ALLOW_UNPRIV_DEBUG},
240 {"allow.suser", "allow.nosuser", PR_ALLOW_SUSER},
241 #ifdef VIMAGE
242 {"allow.nfsd", "allow.nonfsd", PR_ALLOW_NFSD},
243 #endif
244 {"allow.extattr", "allow.noextattr", PR_ALLOW_EXTATTR},
245 {"allow.adjtime", "allow.noadjtime", PR_ALLOW_ADJTIME},
246 {"allow.settime", "allow.nosettime", PR_ALLOW_SETTIME},
247 {"allow.routing", "allow.norouting", PR_ALLOW_ROUTING},
248 {"allow.unprivileged_parent_tampering",
249 "allow.nounprivileged_parent_tampering",
250 PR_ALLOW_UNPRIV_PARENT_TAMPER},
251 #ifdef AUDIT
252 {"allow.setaudit", "allow.nosetaudit", PR_ALLOW_SETAUDIT},
253 #endif
254 };
255 static unsigned pr_allow_all = PR_ALLOW_ALL_STATIC;
256 const size_t pr_flag_allow_size = sizeof(pr_flag_allow);
257
258 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \
259 PR_ALLOW_RESERVED_PORTS | \
260 PR_ALLOW_UNPRIV_DEBUG | \
261 PR_ALLOW_SUSER)
262 #define JAIL_DEFAULT_ENFORCE_STATFS 2
263 #define JAIL_DEFAULT_DEVFS_RSNUM 0
264 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
265 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
266 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
267 #if defined(INET) || defined(INET6)
268 static unsigned jail_max_af_ips = 255;
269 #endif
270
271 /*
272 * Initialize the parts of prison0 that can't be static-initialized with
273 * constants. This is called from proc0_init() after creating thread0 cpuset.
274 */
275 void
prison0_init(void)276 prison0_init(void)
277 {
278 uint8_t *file, *data;
279 size_t size;
280 char buf[sizeof(prison0.pr_hostuuid)];
281 #ifdef MAC
282 int error __diagused;
283 #endif
284 bool valid;
285
286 #ifdef MAC
287 error = mac_prison_init(&prison0, M_WAITOK);
288 MPASS(error == 0);
289
290 mtx_unlock(&prison0.pr_mtx);
291 #endif
292 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset);
293 prison0.pr_osreldate = osreldate;
294 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease));
295
296 /* If we have a preloaded hostuuid, use it. */
297 file = preload_search_by_type(PRISON0_HOSTUUID_MODULE);
298 if (file != NULL) {
299 data = preload_fetch_addr(file);
300 size = preload_fetch_size(file);
301 if (data != NULL) {
302 /*
303 * The preloaded data may include trailing whitespace, almost
304 * certainly a newline; skip over any whitespace or
305 * non-printable characters to be safe.
306 */
307 while (size > 0 && data[size - 1] <= 0x20) {
308 size--;
309 }
310
311 valid = false;
312
313 /*
314 * Not NUL-terminated when passed from loader, but
315 * validate_uuid requires that due to using sscanf (as
316 * does the subsequent strlcpy, since it still reads
317 * past the given size to return the true length);
318 * bounce to a temporary buffer to fix.
319 */
320 if (size >= sizeof(buf))
321 goto done;
322
323 memcpy(buf, data, size);
324 buf[size] = '\0';
325
326 if (validate_uuid(buf, size, NULL, 0) != 0)
327 goto done;
328
329 valid = true;
330 (void)strlcpy(prison0.pr_hostuuid, buf,
331 sizeof(prison0.pr_hostuuid));
332
333 done:
334 if (bootverbose && !valid) {
335 printf("hostuuid: preload data malformed: '%.*s'\n",
336 (int)size, data);
337 }
338 }
339 }
340 if (bootverbose)
341 printf("hostuuid: using %s\n", prison0.pr_hostuuid);
342 }
343
344 /*
345 * struct jail_args {
346 * struct jail *jail;
347 * };
348 */
349 int
sys_jail(struct thread * td,struct jail_args * uap)350 sys_jail(struct thread *td, struct jail_args *uap)
351 {
352 uint32_t version;
353 int error;
354 struct jail j;
355
356 error = copyin(uap->jail, &version, sizeof(uint32_t));
357 if (error)
358 return (error);
359
360 switch (version) {
361 case 0:
362 {
363 struct jail_v0 j0;
364
365 /* FreeBSD single IPv4 jails. */
366 bzero(&j, sizeof(struct jail));
367 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
368 if (error)
369 return (error);
370 j.version = j0.version;
371 j.path = j0.path;
372 j.hostname = j0.hostname;
373 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */
374 break;
375 }
376
377 case 1:
378 /*
379 * Version 1 was used by multi-IPv4 jail implementations
380 * that never made it into the official kernel.
381 */
382 return (EINVAL);
383
384 case 2: /* JAIL_API_VERSION */
385 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
386 error = copyin(uap->jail, &j, sizeof(struct jail));
387 if (error)
388 return (error);
389 break;
390
391 default:
392 /* Sci-Fi jails are not supported, sorry. */
393 return (EINVAL);
394 }
395 return (kern_jail(td, &j));
396 }
397
398 int
kern_jail(struct thread * td,struct jail * j)399 kern_jail(struct thread *td, struct jail *j)
400 {
401 struct iovec optiov[2 * (4 + nitems(pr_flag_allow)
402 #ifdef INET
403 + 1
404 #endif
405 #ifdef INET6
406 + 1
407 #endif
408 )];
409 struct uio opt;
410 char *u_path, *u_hostname, *u_name;
411 struct bool_flags *bf;
412 #ifdef INET
413 uint32_t ip4s;
414 struct in_addr *u_ip4;
415 #endif
416 #ifdef INET6
417 struct in6_addr *u_ip6;
418 #endif
419 size_t tmplen;
420 int error, enforce_statfs;
421
422 bzero(&optiov, sizeof(optiov));
423 opt.uio_iov = optiov;
424 opt.uio_iovcnt = 0;
425 opt.uio_offset = -1;
426 opt.uio_resid = -1;
427 opt.uio_segflg = UIO_SYSSPACE;
428 opt.uio_rw = UIO_READ;
429 opt.uio_td = td;
430
431 /* Set permissions for top-level jails from sysctls. */
432 if (!jailed(td->td_ucred)) {
433 for (bf = pr_flag_allow;
434 bf < pr_flag_allow + nitems(pr_flag_allow) &&
435 atomic_load_int(&bf->flag) != 0;
436 bf++) {
437 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *,
438 (jail_default_allow & bf->flag)
439 ? bf->name : bf->noname);
440 optiov[opt.uio_iovcnt].iov_len =
441 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
442 opt.uio_iovcnt += 2;
443 }
444 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
445 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
446 opt.uio_iovcnt++;
447 enforce_statfs = jail_default_enforce_statfs;
448 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
449 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
450 opt.uio_iovcnt++;
451 }
452
453 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
454 #ifdef INET
455 ip4s = (j->version == 0) ? 1 : j->ip4s;
456 if (ip4s > jail_max_af_ips)
457 return (EINVAL);
458 tmplen += ip4s * sizeof(struct in_addr);
459 #else
460 if (j->ip4s > 0)
461 return (EINVAL);
462 #endif
463 #ifdef INET6
464 if (j->ip6s > jail_max_af_ips)
465 return (EINVAL);
466 tmplen += j->ip6s * sizeof(struct in6_addr);
467 #else
468 if (j->ip6s > 0)
469 return (EINVAL);
470 #endif
471 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
472 u_hostname = u_path + MAXPATHLEN;
473 u_name = u_hostname + MAXHOSTNAMELEN;
474 #ifdef INET
475 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
476 #endif
477 #ifdef INET6
478 #ifdef INET
479 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
480 #else
481 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
482 #endif
483 #endif
484 optiov[opt.uio_iovcnt].iov_base = "path";
485 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
486 opt.uio_iovcnt++;
487 optiov[opt.uio_iovcnt].iov_base = u_path;
488 error = copyinstr(j->path, u_path, MAXPATHLEN,
489 &optiov[opt.uio_iovcnt].iov_len);
490 if (error) {
491 free(u_path, M_TEMP);
492 return (error);
493 }
494 opt.uio_iovcnt++;
495 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
496 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
497 opt.uio_iovcnt++;
498 optiov[opt.uio_iovcnt].iov_base = u_hostname;
499 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
500 &optiov[opt.uio_iovcnt].iov_len);
501 if (error) {
502 free(u_path, M_TEMP);
503 return (error);
504 }
505 opt.uio_iovcnt++;
506 if (j->jailname != NULL) {
507 optiov[opt.uio_iovcnt].iov_base = "name";
508 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
509 opt.uio_iovcnt++;
510 optiov[opt.uio_iovcnt].iov_base = u_name;
511 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
512 &optiov[opt.uio_iovcnt].iov_len);
513 if (error) {
514 free(u_path, M_TEMP);
515 return (error);
516 }
517 opt.uio_iovcnt++;
518 }
519 #ifdef INET
520 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
521 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
522 opt.uio_iovcnt++;
523 optiov[opt.uio_iovcnt].iov_base = u_ip4;
524 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
525 if (j->version == 0)
526 u_ip4->s_addr = j->ip4s;
527 else {
528 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
529 if (error) {
530 free(u_path, M_TEMP);
531 return (error);
532 }
533 }
534 opt.uio_iovcnt++;
535 #endif
536 #ifdef INET6
537 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
538 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
539 opt.uio_iovcnt++;
540 optiov[opt.uio_iovcnt].iov_base = u_ip6;
541 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
542 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
543 if (error) {
544 free(u_path, M_TEMP);
545 return (error);
546 }
547 opt.uio_iovcnt++;
548 #endif
549 KASSERT(opt.uio_iovcnt <= nitems(optiov),
550 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
551 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
552 free(u_path, M_TEMP);
553 return (error);
554 }
555
556 /*
557 * struct jail_set_args {
558 * struct iovec *iovp;
559 * unsigned int iovcnt;
560 * int flags;
561 * };
562 */
563 int
sys_jail_set(struct thread * td,struct jail_set_args * uap)564 sys_jail_set(struct thread *td, struct jail_set_args *uap)
565 {
566 struct uio *auio;
567 int error;
568
569 /* Check that we have an even number of iovecs. */
570 if (uap->iovcnt & 1)
571 return (EINVAL);
572
573 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
574 if (error)
575 return (error);
576 error = kern_jail_set(td, auio, uap->flags);
577 freeuio(auio);
578 return (error);
579 }
580
581 #if defined(INET) || defined(INET6)
582 typedef int prison_addr_cmp_t(const void *, const void *);
583 typedef bool prison_addr_valid_t(const void *);
584 static const struct pr_family {
585 size_t size;
586 prison_addr_cmp_t *cmp;
587 prison_addr_valid_t *valid;
588 int ip_flag;
589 } pr_families[PR_FAMILY_MAX] = {
590 #ifdef INET
591 [PR_INET] = {
592 .size = sizeof(struct in_addr),
593 .cmp = prison_qcmp_v4,
594 .valid = prison_valid_v4,
595 .ip_flag = PR_IP4_USER,
596 },
597 #endif
598 #ifdef INET6
599 [PR_INET6] = {
600 .size = sizeof(struct in6_addr),
601 .cmp = prison_qcmp_v6,
602 .valid = prison_valid_v6,
603 .ip_flag = PR_IP6_USER,
604 },
605 #endif
606 };
607
608 /*
609 * Network address lists (pr_addrs) allocation for jails. The addresses
610 * are accessed locklessly by the network stack, thus need to be protected by
611 * the network epoch.
612 */
613 struct prison_ip {
614 struct epoch_context ctx;
615 uint32_t ips;
616 #ifdef FUTURE_C
617 /*
618 * XXX Variable-length automatic arrays in union may be
619 * supported in future C.
620 */
621 union {
622 char pr_ip[];
623 struct in_addr pr_ip4[];
624 struct in6_addr pr_ip6[];
625 };
626 #else /* No future C :( */
627 char pr_ip[];
628 #endif
629 };
630
631 static char *
PR_IP(struct prison_ip * pip,const pr_family_t af,int idx)632 PR_IP(struct prison_ip *pip, const pr_family_t af, int idx)
633 {
634 MPASS(pip);
635 MPASS(af < PR_FAMILY_MAX);
636 MPASS(idx >= 0 && idx < pip->ips);
637
638 return (pip->pr_ip + pr_families[af].size * idx);
639 }
640
641 static struct prison_ip *
prison_ip_alloc(const pr_family_t af,uint32_t cnt,int flags)642 prison_ip_alloc(const pr_family_t af, uint32_t cnt, int flags)
643 {
644 struct prison_ip *pip;
645
646 pip = malloc(sizeof(struct prison_ip) + cnt * pr_families[af].size,
647 M_PRISON, flags);
648 if (pip != NULL)
649 pip->ips = cnt;
650 return (pip);
651 }
652
653 /*
654 * Allocate and copyin user supplied address list, sorting and validating.
655 * kern_jail_set() helper.
656 */
657 static struct prison_ip *
prison_ip_copyin(const pr_family_t af,void * op,uint32_t cnt)658 prison_ip_copyin(const pr_family_t af, void *op, uint32_t cnt)
659 {
660 prison_addr_cmp_t *const cmp = pr_families[af].cmp;
661 const size_t size = pr_families[af].size;
662 struct prison_ip *pip;
663
664 pip = prison_ip_alloc(af, cnt, M_WAITOK);
665 bcopy(op, pip->pr_ip, cnt * size);
666 /*
667 * IP addresses are all sorted but ip[0] to preserve
668 * the primary IP address as given from userland.
669 * This special IP is used for unbound outgoing
670 * connections as well for "loopback" traffic in case
671 * source address selection cannot find any more fitting
672 * address to connect from.
673 */
674 if (cnt > 1)
675 qsort(PR_IP(pip, af, 1), cnt - 1, size, cmp);
676 /*
677 * Check for duplicate addresses and do some simple
678 * zero and broadcast checks. If users give other bogus
679 * addresses it is their problem.
680 */
681 for (int i = 0; i < cnt; i++) {
682 if (!pr_families[af].valid(PR_IP(pip, af, i))) {
683 free(pip, M_PRISON);
684 return (NULL);
685 }
686 if (i + 1 < cnt &&
687 (cmp(PR_IP(pip, af, 0), PR_IP(pip, af, i + 1)) == 0 ||
688 cmp(PR_IP(pip, af, i), PR_IP(pip, af, i + 1)) == 0)) {
689 free(pip, M_PRISON);
690 return (NULL);
691 }
692 }
693
694 return (pip);
695 }
696
697 /*
698 * Allocate and dup parent prison address list.
699 * kern_jail_set() helper.
700 */
701 static void
prison_ip_dup(struct prison * ppr,struct prison * pr,const pr_family_t af)702 prison_ip_dup(struct prison *ppr, struct prison *pr, const pr_family_t af)
703 {
704 const struct prison_ip *ppip = ppr->pr_addrs[af];
705 struct prison_ip *pip;
706
707 if (ppip != NULL) {
708 pip = prison_ip_alloc(af, ppip->ips, M_WAITOK);
709 bcopy(ppip->pr_ip, pip->pr_ip, pip->ips * pr_families[af].size);
710 pr->pr_addrs[af] = pip;
711 }
712 }
713
714 /*
715 * Make sure the new set of IP addresses is a subset of the parent's list.
716 * Don't worry about the parent being unlocked, as any setting is done with
717 * allprison_lock held.
718 * kern_jail_set() helper.
719 */
720 static bool
prison_ip_parent_match(struct prison_ip * ppip,struct prison_ip * pip,const pr_family_t af)721 prison_ip_parent_match(struct prison_ip *ppip, struct prison_ip *pip,
722 const pr_family_t af)
723 {
724 prison_addr_cmp_t *const cmp = pr_families[af].cmp;
725 int i, j;
726
727 if (ppip == NULL)
728 return (false);
729
730 for (i = 0; i < ppip->ips; i++)
731 if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, i)) == 0)
732 break;
733
734 if (i == ppip->ips)
735 /* Main address not present in parent. */
736 return (false);
737
738 if (pip->ips > 1) {
739 for (i = j = 1; i < pip->ips; i++) {
740 if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0)
741 /* Equals to parent primary address. */
742 continue;
743 for (; j < ppip->ips; j++)
744 if (cmp(PR_IP(pip, af, i),
745 PR_IP(ppip, af, j)) == 0)
746 break;
747 if (j == ppip->ips)
748 break;
749 }
750 if (j == ppip->ips)
751 /* Address not present in parent. */
752 return (false);
753 }
754 return (true);
755 }
756
757 /*
758 * Check for conflicting IP addresses. We permit them if there is no more
759 * than one IP on each jail. If there is a duplicate on a jail with more
760 * than one IP stop checking and return error.
761 * kern_jail_set() helper.
762 */
763 static bool
prison_ip_conflict_check(const struct prison * ppr,const struct prison * pr,struct prison_ip * pip,pr_family_t af)764 prison_ip_conflict_check(const struct prison *ppr, const struct prison *pr,
765 struct prison_ip *pip, pr_family_t af)
766 {
767 const struct prison *tppr, *tpr;
768 int descend;
769
770 #ifdef VIMAGE
771 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent)
772 if (tppr->pr_flags & PR_VNET)
773 break;
774 #else
775 tppr = &prison0;
776 #endif
777 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
778 if (tpr == pr ||
779 #ifdef VIMAGE
780 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
781 #endif
782 !prison_isalive(tpr)) {
783 descend = 0;
784 continue;
785 }
786 if (!(tpr->pr_flags & pr_families[af].ip_flag))
787 continue;
788 descend = 0;
789 if (tpr->pr_addrs[af] == NULL ||
790 (pip->ips == 1 && tpr->pr_addrs[af]->ips == 1))
791 continue;
792 for (int i = 0; i < pip->ips; i++)
793 if (prison_ip_check(tpr, af, PR_IP(pip, af, i)) == 0)
794 return (false);
795 }
796
797 return (true);
798 }
799
800 _Static_assert(offsetof(struct prison_ip, ctx) == 0,
801 "prison must start with epoch context");
802 static void
prison_ip_free_deferred(epoch_context_t ctx)803 prison_ip_free_deferred(epoch_context_t ctx)
804 {
805
806 free(ctx, M_PRISON);
807 }
808
809 static void
prison_ip_free(struct prison_ip * pip)810 prison_ip_free(struct prison_ip *pip)
811 {
812
813 if (pip != NULL)
814 NET_EPOCH_CALL(prison_ip_free_deferred, &pip->ctx);
815 }
816
817 static void
prison_ip_set(struct prison * pr,const pr_family_t af,struct prison_ip * new)818 prison_ip_set(struct prison *pr, const pr_family_t af, struct prison_ip *new)
819 {
820 struct prison_ip **mem, *old;
821
822 mtx_assert(&pr->pr_mtx, MA_OWNED);
823
824 mem = &pr->pr_addrs[af];
825
826 old = *mem;
827 atomic_store_ptr(mem, new);
828 prison_ip_free(old);
829 }
830
831 /*
832 * Restrict a prison's IP address list with its parent's, possibly replacing
833 * it. Return true if succeed, otherwise should redo.
834 * kern_jail_set() helper.
835 */
836 static bool
prison_ip_restrict(struct prison * pr,const pr_family_t af,struct prison_ip ** newp)837 prison_ip_restrict(struct prison *pr, const pr_family_t af,
838 struct prison_ip **newp)
839 {
840 struct prison_ip *ppip = pr->pr_parent->pr_addrs[af];
841 struct prison_ip *pip = pr->pr_addrs[af];
842 int (*const cmp)(const void *, const void *) = pr_families[af].cmp;
843 const size_t size = pr_families[af].size;
844 struct prison_ip *new = newp != NULL ? *newp : NULL;
845 uint32_t ips;
846
847 mtx_assert(&pr->pr_mtx, MA_OWNED);
848
849 /*
850 * Due to epoch-synchronized access to the IP address lists we always
851 * allocate a new list even if the old one has enough space. We could
852 * atomically update an IPv4 address inside a list, but that would
853 * screw up sorting, and in case of IPv6 we can't even atomically write
854 * one.
855 */
856 if (ppip == NULL) {
857 if (pip != NULL)
858 prison_ip_set(pr, af, NULL);
859 return (true);
860 }
861
862 if (!(pr->pr_flags & pr_families[af].ip_flag)) {
863 if (new == NULL) {
864 new = prison_ip_alloc(af, ppip->ips, M_NOWAIT);
865 if (new == NULL)
866 return (false); /* Redo */
867 }
868 /* This has no user settings, so just copy the parent's list. */
869 MPASS(new->ips == ppip->ips);
870 bcopy(ppip->pr_ip, new->pr_ip, ppip->ips * size);
871 prison_ip_set(pr, af, new);
872 if (newp != NULL)
873 *newp = NULL; /* Used */
874 } else if (pip != NULL) {
875 /* Remove addresses that aren't in the parent. */
876 int i;
877
878 i = 0; /* index in pip */
879 ips = 0; /* index in new */
880
881 if (new == NULL) {
882 new = prison_ip_alloc(af, pip->ips, M_NOWAIT);
883 if (new == NULL)
884 return (false); /* Redo */
885 }
886
887 for (int pi = 0; pi < ppip->ips; pi++)
888 if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, pi)) == 0) {
889 /* Found our primary address in parent. */
890 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips),
891 size);
892 i++;
893 ips++;
894 break;
895 }
896 for (int pi = 1; i < pip->ips; ) {
897 /* Check against primary, which is unsorted. */
898 if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0) {
899 /* Matches parent's primary address. */
900 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips),
901 size);
902 i++;
903 ips++;
904 continue;
905 }
906 /* The rest are sorted. */
907 switch (pi >= ppip->ips ? -1 :
908 cmp(PR_IP(pip, af, i), PR_IP(ppip, af, pi))) {
909 case -1:
910 i++;
911 break;
912 case 0:
913 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips),
914 size);
915 i++;
916 pi++;
917 ips++;
918 break;
919 case 1:
920 pi++;
921 break;
922 }
923 }
924 if (ips == 0) {
925 if (newp == NULL || *newp == NULL)
926 prison_ip_free(new);
927 new = NULL;
928 } else {
929 /* Shrink to real size */
930 KASSERT((new->ips >= ips),
931 ("Out-of-bounds write to prison_ip %p", new));
932 new->ips = ips;
933 }
934 prison_ip_set(pr, af, new);
935 if (newp != NULL)
936 *newp = NULL; /* Used */
937 }
938 return (true);
939 }
940
941 /*
942 * Fast-path check if an address belongs to a prison.
943 */
944 int
prison_ip_check(const struct prison * pr,const pr_family_t af,const void * addr)945 prison_ip_check(const struct prison *pr, const pr_family_t af,
946 const void *addr)
947 {
948 int (*const cmp)(const void *, const void *) = pr_families[af].cmp;
949 struct prison_ip *pip;
950 int i, a, z, d;
951
952 MPASS(mtx_owned(&pr->pr_mtx) ||
953 in_epoch(net_epoch_preempt) ||
954 sx_xlocked(&allprison_lock));
955
956 pip = atomic_load_ptr(&pr->pr_addrs[af]);
957 if (__predict_false(pip == NULL))
958 return (EAFNOSUPPORT);
959
960 /* Check the primary IP. */
961 if (cmp(PR_IP(pip, af, 0), addr) == 0)
962 return (0);
963
964 /*
965 * All the other IPs are sorted so we can do a binary search.
966 */
967 a = 0;
968 z = pip->ips - 2;
969 while (a <= z) {
970 i = (a + z) / 2;
971 d = cmp(PR_IP(pip, af, i + 1), addr);
972 if (d > 0)
973 z = i - 1;
974 else if (d < 0)
975 a = i + 1;
976 else
977 return (0);
978 }
979
980 return (EADDRNOTAVAIL);
981 }
982
983 /*
984 * Grab primary IP. Historically required mutex, but nothing prevents
985 * us to support epoch-protected access. Is it used in fast path?
986 * in{6}_jail.c helper
987 */
988 const void *
prison_ip_get0(const struct prison * pr,const pr_family_t af)989 prison_ip_get0(const struct prison *pr, const pr_family_t af)
990 {
991 const struct prison_ip *pip = pr->pr_addrs[af];
992
993 mtx_assert(&pr->pr_mtx, MA_OWNED);
994 MPASS(pip);
995
996 return (pip->pr_ip);
997 }
998
999 u_int
prison_ip_cnt(const struct prison * pr,const pr_family_t af)1000 prison_ip_cnt(const struct prison *pr, const pr_family_t af)
1001 {
1002
1003 return (pr->pr_addrs[af]->ips);
1004 }
1005 #endif /* defined(INET) || defined(INET6) */
1006
1007 int
kern_jail_set(struct thread * td,struct uio * optuio,int flags)1008 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
1009 {
1010 struct file *jfp_out;
1011 struct nameidata nd;
1012 #ifdef INET
1013 struct prison_ip *ip4;
1014 #endif
1015 #ifdef INET6
1016 struct prison_ip *ip6;
1017 #endif
1018 struct vfsopt *opt;
1019 struct vfsoptlist *opts;
1020 struct prison *pr, *deadpr, *dinspr, *inspr, *mypr, *ppr, *tpr;
1021 struct ucred *jdcred;
1022 struct vnode *root;
1023 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
1024 char *g_path, *osrelstr;
1025 struct bool_flags *bf;
1026 struct jailsys_flags *jsf;
1027 #if defined(INET) || defined(INET6)
1028 void *op;
1029 #endif
1030 unsigned long hid;
1031 size_t namelen, onamelen, pnamelen;
1032 #ifdef MAC
1033 void *mac_set_prison_data = NULL;
1034 int gotmaclabel;
1035 #endif
1036 int created, cuflags, descend, drflags, enforce;
1037 int error, errmsg_len, errmsg_pos;
1038 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
1039 int deadid, jfd_in, jfd_out, jfd_pos, jid, jsys, len, level;
1040 int childmax, osreldt, rsnum, slevel;
1041 #ifdef INET
1042 int ip4s;
1043 bool redo_ip4;
1044 #endif
1045 #ifdef INET6
1046 int ip6s;
1047 bool redo_ip6;
1048 #endif
1049 bool maybe_changed;
1050 uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
1051 uint64_t pr_allow_diff;
1052 unsigned tallow;
1053 char numbuf[12];
1054
1055 mypr = td->td_ucred->cr_prison;
1056 if (((flags & (JAIL_CREATE | JAIL_AT_DESC)) == JAIL_CREATE) &&
1057 mypr->pr_childmax == 0)
1058 return (EPERM);
1059 if (flags & ~JAIL_SET_MASK)
1060 return (EINVAL);
1061 if ((flags & (JAIL_USE_DESC | JAIL_AT_DESC)) ==
1062 (JAIL_USE_DESC | JAIL_AT_DESC))
1063 return (EINVAL);
1064 prison_hold(mypr);
1065
1066 #ifdef INET
1067 ip4 = NULL;
1068 #endif
1069 #ifdef INET6
1070 ip6 = NULL;
1071 #endif
1072 g_path = NULL;
1073 jfp_out = NULL;
1074 jfd_out = -1;
1075 /*
1076 * Check all the parameters before committing to anything. Not all
1077 * errors can be caught early, but we may as well try. Also, this
1078 * takes care of some expensive stuff (path lookup) before getting
1079 * the allprison lock.
1080 *
1081 * XXX Jails are not filesystems, and jail parameters are not mount
1082 * options. But it makes more sense to re-use the vfsopt code
1083 * than duplicate it under a different name.
1084 */
1085 error = vfs_buildopts(optuio, &opts);
1086 if (error) {
1087 opts = NULL;
1088 goto done_free;
1089 }
1090
1091 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
1092 if (!cuflags) {
1093 error = EINVAL;
1094 vfs_opterror(opts, "no valid operation (create or update)");
1095 goto done_errmsg;
1096 }
1097
1098 error = vfs_copyopt(opts, "desc", &jfd_in, sizeof(jfd_in));
1099 if (error == ENOENT) {
1100 if (flags & (JAIL_USE_DESC | JAIL_AT_DESC | JAIL_GET_DESC |
1101 JAIL_OWN_DESC)) {
1102 vfs_opterror(opts, "missing desc");
1103 goto done_errmsg;
1104 }
1105 jfd_in = -1;
1106 } else if (error != 0)
1107 goto done_free;
1108 else {
1109 if (!(flags & (JAIL_USE_DESC | JAIL_AT_DESC | JAIL_GET_DESC |
1110 JAIL_OWN_DESC))) {
1111 error = EINVAL;
1112 vfs_opterror(opts, "unexpected desc");
1113 goto done_errmsg;
1114 }
1115 if (flags & JAIL_AT_DESC) {
1116 /*
1117 * Look up and create jails based on the
1118 * descriptor's prison.
1119 */
1120 prison_free(mypr);
1121 error = jaildesc_find(td, jfd_in, &mypr, NULL);
1122 if (error != 0) {
1123 vfs_opterror(opts, error == ENOENT ?
1124 "descriptor to dead jail" :
1125 "not a jail descriptor");
1126 goto done_errmsg;
1127 }
1128 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) {
1129 error = EPERM;
1130 goto done_free;
1131 }
1132 }
1133 if (flags & (JAIL_GET_DESC | JAIL_OWN_DESC)) {
1134 /* Allocate a jail descriptor to return later. */
1135 error = jaildesc_alloc(td, &jfp_out, &jfd_out,
1136 flags & JAIL_OWN_DESC);
1137 if (error)
1138 goto done_free;
1139 }
1140 }
1141
1142 /*
1143 * Delay the permission check if using a jail descriptor,
1144 * until we get the descriptor's credentials.
1145 */
1146 if (!(flags & JAIL_USE_DESC)) {
1147 error = priv_check(td, PRIV_JAIL_SET);
1148 if (error == 0 && (flags & JAIL_ATTACH))
1149 error = priv_check(td, PRIV_JAIL_ATTACH);
1150 if (error)
1151 goto done_free;
1152 }
1153
1154 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
1155 if (error == ENOENT)
1156 jid = 0;
1157 else if (error != 0)
1158 goto done_free;
1159
1160 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
1161 if (error == ENOENT)
1162 gotslevel = 0;
1163 else if (error != 0)
1164 goto done_free;
1165 else
1166 gotslevel = 1;
1167
1168 error =
1169 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
1170 if (error == ENOENT)
1171 gotchildmax = 0;
1172 else if (error != 0)
1173 goto done_free;
1174 else
1175 gotchildmax = 1;
1176
1177 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
1178 if (error == ENOENT)
1179 gotenforce = 0;
1180 else if (error != 0)
1181 goto done_free;
1182 else if (enforce < 0 || enforce > 2) {
1183 error = EINVAL;
1184 goto done_free;
1185 } else
1186 gotenforce = 1;
1187
1188 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
1189 if (error == ENOENT)
1190 gotrsnum = 0;
1191 else if (error != 0)
1192 goto done_free;
1193 else
1194 gotrsnum = 1;
1195
1196 pr_flags = ch_flags = 0;
1197 for (bf = pr_flag_bool;
1198 bf < pr_flag_bool + nitems(pr_flag_bool);
1199 bf++) {
1200 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag);
1201 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag);
1202 }
1203 ch_flags |= pr_flags;
1204 for (jsf = pr_flag_jailsys;
1205 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
1206 jsf++) {
1207 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys));
1208 if (error == ENOENT)
1209 continue;
1210 if (error != 0)
1211 goto done_free;
1212 switch (jsys) {
1213 case JAIL_SYS_DISABLE:
1214 if (!jsf->disable) {
1215 error = EINVAL;
1216 goto done_free;
1217 }
1218 pr_flags |= jsf->disable;
1219 break;
1220 case JAIL_SYS_NEW:
1221 pr_flags |= jsf->new;
1222 break;
1223 case JAIL_SYS_INHERIT:
1224 break;
1225 default:
1226 error = EINVAL;
1227 goto done_free;
1228 }
1229 ch_flags |= jsf->new | jsf->disable;
1230 }
1231 if ((flags & (JAIL_CREATE | JAIL_ATTACH)) == JAIL_CREATE
1232 && !(pr_flags & PR_PERSIST)) {
1233 error = EINVAL;
1234 vfs_opterror(opts, "new jail must persist or attach");
1235 goto done_errmsg;
1236 }
1237 #ifdef VIMAGE
1238 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
1239 error = EINVAL;
1240 vfs_opterror(opts, "vnet cannot be changed after creation");
1241 goto done_errmsg;
1242 }
1243 #endif
1244 #ifdef INET
1245 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
1246 error = EINVAL;
1247 vfs_opterror(opts, "ip4 cannot be changed after creation");
1248 goto done_errmsg;
1249 }
1250 #endif
1251 #ifdef INET6
1252 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
1253 error = EINVAL;
1254 vfs_opterror(opts, "ip6 cannot be changed after creation");
1255 goto done_errmsg;
1256 }
1257 #endif
1258
1259 pr_allow = ch_allow = 0;
1260 for (bf = pr_flag_allow;
1261 bf < pr_flag_allow + nitems(pr_flag_allow) &&
1262 atomic_load_int(&bf->flag) != 0;
1263 bf++) {
1264 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag);
1265 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag);
1266 }
1267 ch_allow |= pr_allow;
1268
1269 error = vfs_getopt(opts, "name", (void **)&name, &len);
1270 if (error == ENOENT)
1271 name = NULL;
1272 else if (error != 0)
1273 goto done_free;
1274 else {
1275 if (len == 0 || name[len - 1] != '\0') {
1276 error = EINVAL;
1277 goto done_free;
1278 }
1279 if (len > MAXHOSTNAMELEN) {
1280 error = ENAMETOOLONG;
1281 goto done_free;
1282 }
1283 }
1284
1285 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
1286 if (error == ENOENT)
1287 host = NULL;
1288 else if (error != 0)
1289 goto done_free;
1290 else {
1291 ch_flags |= PR_HOST;
1292 pr_flags |= PR_HOST;
1293 if (len == 0 || host[len - 1] != '\0') {
1294 error = EINVAL;
1295 goto done_free;
1296 }
1297 if (len > MAXHOSTNAMELEN) {
1298 error = ENAMETOOLONG;
1299 goto done_free;
1300 }
1301 }
1302
1303 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
1304 if (error == ENOENT)
1305 domain = NULL;
1306 else if (error != 0)
1307 goto done_free;
1308 else {
1309 ch_flags |= PR_HOST;
1310 pr_flags |= PR_HOST;
1311 if (len == 0 || domain[len - 1] != '\0') {
1312 error = EINVAL;
1313 goto done_free;
1314 }
1315 if (len > MAXHOSTNAMELEN) {
1316 error = ENAMETOOLONG;
1317 goto done_free;
1318 }
1319 }
1320
1321 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
1322 if (error == ENOENT)
1323 uuid = NULL;
1324 else if (error != 0)
1325 goto done_free;
1326 else {
1327 ch_flags |= PR_HOST;
1328 pr_flags |= PR_HOST;
1329 if (len == 0 || uuid[len - 1] != '\0') {
1330 error = EINVAL;
1331 goto done_free;
1332 }
1333 if (len > HOSTUUIDLEN) {
1334 error = ENAMETOOLONG;
1335 goto done_free;
1336 }
1337 }
1338
1339 #ifdef COMPAT_FREEBSD32
1340 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
1341 uint32_t hid32;
1342
1343 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
1344 hid = hid32;
1345 } else
1346 #endif
1347 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
1348 if (error == ENOENT)
1349 gothid = 0;
1350 else if (error != 0)
1351 goto done_free;
1352 else {
1353 gothid = 1;
1354 ch_flags |= PR_HOST;
1355 pr_flags |= PR_HOST;
1356 }
1357
1358 #ifdef MAC
1359 /* Process the mac.label vfsopt */
1360 error = mac_set_prison_prepare(td, opts, &mac_set_prison_data);
1361 if (error == ENOENT)
1362 gotmaclabel = 0;
1363 else if (error != 0)
1364 goto done_errmsg;
1365 else
1366 gotmaclabel = 1;
1367 #endif
1368
1369 #ifdef INET
1370 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
1371 if (error == ENOENT)
1372 ip4s = 0;
1373 else if (error != 0)
1374 goto done_free;
1375 else if (ip4s & (sizeof(struct in_addr) - 1)) {
1376 error = EINVAL;
1377 goto done_free;
1378 } else {
1379 ch_flags |= PR_IP4_USER;
1380 pr_flags |= PR_IP4_USER;
1381 if (ip4s > 0) {
1382 ip4s /= sizeof(struct in_addr);
1383 if (ip4s > jail_max_af_ips) {
1384 error = EINVAL;
1385 vfs_opterror(opts, "too many IPv4 addresses");
1386 goto done_errmsg;
1387 }
1388 ip4 = prison_ip_copyin(PR_INET, op, ip4s);
1389 if (ip4 == NULL) {
1390 error = EINVAL;
1391 goto done_free;
1392 }
1393 }
1394 }
1395 #endif
1396
1397 #ifdef INET6
1398 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
1399 if (error == ENOENT)
1400 ip6s = 0;
1401 else if (error != 0)
1402 goto done_free;
1403 else if (ip6s & (sizeof(struct in6_addr) - 1)) {
1404 error = EINVAL;
1405 goto done_free;
1406 } else {
1407 ch_flags |= PR_IP6_USER;
1408 pr_flags |= PR_IP6_USER;
1409 if (ip6s > 0) {
1410 ip6s /= sizeof(struct in6_addr);
1411 if (ip6s > jail_max_af_ips) {
1412 error = EINVAL;
1413 vfs_opterror(opts, "too many IPv6 addresses");
1414 goto done_errmsg;
1415 }
1416 ip6 = prison_ip_copyin(PR_INET6, op, ip6s);
1417 if (ip6 == NULL) {
1418 error = EINVAL;
1419 goto done_free;
1420 }
1421 }
1422 }
1423 #endif
1424
1425 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1426 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1427 error = EINVAL;
1428 vfs_opterror(opts,
1429 "vnet jails cannot have IP address restrictions");
1430 goto done_errmsg;
1431 }
1432 #endif
1433
1434 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len);
1435 if (error == ENOENT)
1436 osrelstr = NULL;
1437 else if (error != 0)
1438 goto done_free;
1439 else {
1440 if (flags & JAIL_UPDATE) {
1441 error = EINVAL;
1442 vfs_opterror(opts,
1443 "osrelease cannot be changed after creation");
1444 goto done_errmsg;
1445 }
1446 if (len == 0 || osrelstr[len - 1] != '\0') {
1447 error = EINVAL;
1448 goto done_free;
1449 }
1450 if (len >= OSRELEASELEN) {
1451 error = ENAMETOOLONG;
1452 vfs_opterror(opts,
1453 "osrelease string must be 1-%d bytes long",
1454 OSRELEASELEN - 1);
1455 goto done_errmsg;
1456 }
1457 }
1458
1459 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt));
1460 if (error == ENOENT)
1461 osreldt = 0;
1462 else if (error != 0)
1463 goto done_free;
1464 else {
1465 if (flags & JAIL_UPDATE) {
1466 error = EINVAL;
1467 vfs_opterror(opts,
1468 "osreldate cannot be changed after creation");
1469 goto done_errmsg;
1470 }
1471 if (osreldt == 0) {
1472 error = EINVAL;
1473 vfs_opterror(opts, "osreldate cannot be 0");
1474 goto done_errmsg;
1475 }
1476 }
1477
1478 root = NULL;
1479 error = vfs_getopt(opts, "path", (void **)&path, &len);
1480 if (error == ENOENT)
1481 path = NULL;
1482 else if (error != 0)
1483 goto done_free;
1484 else {
1485 if (flags & JAIL_UPDATE) {
1486 error = EINVAL;
1487 vfs_opterror(opts,
1488 "path cannot be changed after creation");
1489 goto done_errmsg;
1490 }
1491 if (len == 0 || path[len - 1] != '\0') {
1492 error = EINVAL;
1493 goto done_free;
1494 }
1495 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path);
1496 error = namei(&nd);
1497 if (error)
1498 goto done_free;
1499 root = nd.ni_vp;
1500 NDFREE_PNBUF(&nd);
1501 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1502 strlcpy(g_path, path, MAXPATHLEN);
1503 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
1504 if (error == 0) {
1505 path = g_path;
1506 } else {
1507 /* exit on other errors */
1508 goto done_free;
1509 }
1510 if (root->v_type != VDIR) {
1511 error = ENOTDIR;
1512 vput(root);
1513 goto done_free;
1514 }
1515 VOP_UNLOCK(root);
1516 }
1517
1518 /*
1519 * Find the specified jail, or at least its parent.
1520 * This abuses the file error codes ENOENT and EEXIST.
1521 */
1522 pr = NULL;
1523 inspr = NULL;
1524 deadpr = NULL;
1525 maybe_changed = false;
1526 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
1527 namelc = strrchr(name, '.');
1528 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
1529 if (*p != '\0')
1530 jid = 0;
1531 }
1532 sx_xlock(&allprison_lock);
1533 drflags = PD_LIST_XLOCKED;
1534 ppr = mypr;
1535 if (!prison_isalive(ppr)) {
1536 /* This jail is dying. This process will surely follow. */
1537 error = EAGAIN;
1538 goto done_deref;
1539 }
1540 if (flags & JAIL_USE_DESC) {
1541 /* Get the jail from its descriptor. */
1542 error = jaildesc_find(td, jfd_in, &pr, &jdcred);
1543 if (error) {
1544 vfs_opterror(opts, error == ENOENT ?
1545 "descriptor to dead jail" :
1546 "not a jail descriptor");
1547 goto done_deref;
1548 }
1549 drflags |= PD_DEREF;
1550 error = priv_check_cred(jdcred, PRIV_JAIL_SET);
1551 if (error == 0 && (flags & JAIL_ATTACH))
1552 error = priv_check_cred(jdcred, PRIV_JAIL_ATTACH);
1553 crfree(jdcred);
1554 if (error)
1555 goto done_deref;
1556 mtx_lock(&pr->pr_mtx);
1557 drflags |= PD_LOCKED;
1558 if (cuflags == JAIL_CREATE) {
1559 error = EEXIST;
1560 vfs_opterror(opts, "jail %d already exists",
1561 pr->pr_id);
1562 goto done_deref;
1563 }
1564 if (!prison_isalive(pr)) {
1565 /* While a jid can be resurrected, the prison
1566 * itself cannot.
1567 */
1568 error = ENOENT;
1569 vfs_opterror(opts, "jail %d is dying", pr->pr_id);
1570 goto done_deref;
1571 }
1572 if (jid != 0 && jid != pr->pr_id) {
1573 error = EINVAL;
1574 vfs_opterror(opts, "cannot change jid");
1575 goto done_deref;
1576 }
1577 jid = pr->pr_id;
1578 } else if (jid != 0) {
1579 if (jid < 0) {
1580 error = EINVAL;
1581 vfs_opterror(opts, "negative jid");
1582 goto done_deref;
1583 }
1584 /*
1585 * See if a requested jid already exists. Keep track of
1586 * where it can be inserted later.
1587 */
1588 TAILQ_FOREACH(inspr, &allprison, pr_list) {
1589 if (inspr->pr_id < jid)
1590 continue;
1591 if (inspr->pr_id > jid)
1592 break;
1593 if (prison_isalive(inspr)) {
1594 pr = inspr;
1595 mtx_lock(&pr->pr_mtx);
1596 drflags |= PD_LOCKED;
1597 } else {
1598 /* Note a dying jail to handle later. */
1599 deadpr = inspr;
1600 }
1601 inspr = NULL;
1602 break;
1603 }
1604 if (cuflags == JAIL_CREATE && pr != NULL) {
1605 /*
1606 * Even creators that cannot see the jail will
1607 * get EEXIST.
1608 */
1609 error = EEXIST;
1610 vfs_opterror(opts, "jail %d already exists", jid);
1611 goto done_deref;
1612 }
1613 if ((pr == NULL)
1614 ? cuflags == JAIL_UPDATE
1615 : !prison_ischild(mypr, pr)) {
1616 /*
1617 * Updaters get ENOENT for nonexistent jails,
1618 * or for jails they cannot see. The latter
1619 * case is true even for CREATE | UPDATE,
1620 * which normally cannot give this error.
1621 */
1622 error = ENOENT;
1623 vfs_opterror(opts, "jail %d not found", jid);
1624 goto done_deref;
1625 }
1626 }
1627 /*
1628 * If the caller provided a name, look for a jail by that name.
1629 * This has different semantics for creates and updates keyed by jid
1630 * (where the name must not already exist in a different jail),
1631 * and updates keyed by the name itself (where the name must exist
1632 * because that is the jail being updated).
1633 */
1634 namelc = NULL;
1635 if (name != NULL) {
1636 namelc = strrchr(name, '.');
1637 if (namelc == NULL)
1638 namelc = name;
1639 else {
1640 /*
1641 * This is a hierarchical name. Split it into the
1642 * parent and child names, and make sure the parent
1643 * exists or matches an already found jail.
1644 */
1645 if (pr != NULL) {
1646 if (strncmp(name, ppr->pr_name, namelc - name)
1647 || ppr->pr_name[namelc - name] != '\0') {
1648 error = EINVAL;
1649 vfs_opterror(opts,
1650 "cannot change jail's parent");
1651 goto done_deref;
1652 }
1653 } else {
1654 *namelc = '\0';
1655 ppr = prison_find_name(mypr, name);
1656 if (ppr == NULL) {
1657 error = ENOENT;
1658 vfs_opterror(opts,
1659 "jail \"%s\" not found", name);
1660 goto done_deref;
1661 }
1662 mtx_unlock(&ppr->pr_mtx);
1663 if (!prison_isalive(ppr)) {
1664 error = ENOENT;
1665 vfs_opterror(opts,
1666 "jail \"%s\" is dying", name);
1667 goto done_deref;
1668 }
1669 *namelc = '.';
1670 }
1671 namelc++;
1672 }
1673 if (namelc[0] != '\0') {
1674 pnamelen =
1675 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1676 FOREACH_PRISON_CHILD(ppr, tpr) {
1677 if (tpr == pr || !prison_isalive(tpr) ||
1678 strcmp(tpr->pr_name + pnamelen, namelc))
1679 continue;
1680 if (cuflags == JAIL_CREATE || pr != NULL) {
1681 /*
1682 * Create, or update(jid): name must
1683 * not exist in an active sibling jail.
1684 */
1685 error = EEXIST;
1686 vfs_opterror(opts,
1687 "jail \"%s\" already exists", name);
1688 goto done_deref;
1689 }
1690 /* Use this jail for updates. */
1691 pr = tpr;
1692 mtx_lock(&pr->pr_mtx);
1693 drflags |= PD_LOCKED;
1694 break;
1695 }
1696 /*
1697 * Update: name must exist if no jid is specified.
1698 * As with the jid case, the jail must be currently
1699 * visible, or else even CREATE | UPDATE will get
1700 * an error.
1701 */
1702 if ((pr == NULL)
1703 ? cuflags == JAIL_UPDATE
1704 : !prison_isalive(pr)) {
1705 error = ENOENT;
1706 vfs_opterror(opts, "jail \"%s\" not found",
1707 name);
1708 goto done_deref;
1709 }
1710 }
1711 }
1712 /* Update: must provide a desc, jid, or name. */
1713 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1714 error = ENOENT;
1715 vfs_opterror(opts, "update specified no jail");
1716 goto done_deref;
1717 }
1718
1719 /* If there's no prison to update, create a new one and link it in. */
1720 created = pr == NULL;
1721 if (created) {
1722 #ifdef MAC
1723 error = mac_prison_check_create(td->td_ucred, opts, flags);
1724 if (error != 0)
1725 goto done_deref;
1726 #endif
1727 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1728 if (tpr->pr_childcount >= tpr->pr_childmax) {
1729 error = EPERM;
1730 vfs_opterror(opts, "prison limit exceeded");
1731 goto done_deref;
1732 }
1733
1734 if (deadpr != NULL) {
1735 /*
1736 * The prison being created has the same ID as a dying
1737 * one. Handle this by giving the dying jail a new ID.
1738 * This may cause some confusion to user space, but
1739 * only to those listing dying jails.
1740 */
1741 deadid = get_next_deadid(&dinspr);
1742 if (deadid == 0) {
1743 error = EAGAIN;
1744 vfs_opterror(opts, "no available jail IDs");
1745 goto done_deref;
1746 }
1747 mtx_lock(&deadpr->pr_mtx);
1748 deadpr->pr_id = deadid;
1749 mtx_unlock(&deadpr->pr_mtx);
1750 if (dinspr == deadpr)
1751 inspr = deadpr;
1752 else {
1753 inspr = TAILQ_NEXT(deadpr, pr_list);
1754 TAILQ_REMOVE(&allprison, deadpr, pr_list);
1755 if (dinspr != NULL)
1756 TAILQ_INSERT_AFTER(&allprison, dinspr,
1757 deadpr, pr_list);
1758 else
1759 TAILQ_INSERT_HEAD(&allprison, deadpr,
1760 pr_list);
1761 }
1762 }
1763 if (jid == 0 && (jid = get_next_prid(&inspr)) == 0) {
1764 error = EAGAIN;
1765 vfs_opterror(opts, "no available jail IDs");
1766 goto done_deref;
1767 }
1768
1769 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1770 pr->pr_state = PRISON_STATE_INVALID;
1771 refcount_init(&pr->pr_ref, 1);
1772 refcount_init(&pr->pr_uref, 0);
1773 drflags |= PD_DEREF;
1774 LIST_INIT(&pr->pr_children);
1775 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1776 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
1777
1778 pr->pr_id = jid;
1779 if (inspr != NULL)
1780 TAILQ_INSERT_BEFORE(inspr, pr, pr_list);
1781 else
1782 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1783
1784 pr->pr_parent = ppr;
1785 prison_hold(ppr);
1786 prison_proc_hold(ppr);
1787 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1788 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1789 tpr->pr_childcount++;
1790 pr->pr_klist = knlist_alloc(&pr->pr_mtx);
1791
1792 /* Set some default values, and inherit some from the parent. */
1793 if (namelc == NULL)
1794 namelc = "";
1795 if (path == NULL) {
1796 path = "/";
1797 root = mypr->pr_root;
1798 vref(root);
1799 }
1800 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1801 pr->pr_flags |= PR_HOST;
1802 #if defined(INET) || defined(INET6)
1803 #ifdef VIMAGE
1804 if (!(pr_flags & PR_VNET))
1805 #endif
1806 {
1807 #ifdef INET
1808 if (!(ch_flags & PR_IP4_USER))
1809 pr->pr_flags |= PR_IP4 | PR_IP4_USER;
1810 else if (!(pr_flags & PR_IP4_USER)) {
1811 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1812 prison_ip_dup(ppr, pr, PR_INET);
1813 }
1814 #endif
1815 #ifdef INET6
1816 if (!(ch_flags & PR_IP6_USER))
1817 pr->pr_flags |= PR_IP6 | PR_IP6_USER;
1818 else if (!(pr_flags & PR_IP6_USER)) {
1819 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1820 prison_ip_dup(ppr, pr, PR_INET6);
1821 }
1822 #endif
1823 }
1824 #endif
1825 /* Source address selection is always on by default. */
1826 pr->pr_flags |= _PR_IP_SADDRSEL;
1827
1828 pr->pr_securelevel = ppr->pr_securelevel;
1829 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1830 pr->pr_enforce_statfs = jail_default_enforce_statfs;
1831 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
1832
1833 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate;
1834 if (osrelstr == NULL)
1835 strlcpy(pr->pr_osrelease, ppr->pr_osrelease,
1836 sizeof(pr->pr_osrelease));
1837 else
1838 strlcpy(pr->pr_osrelease, osrelstr,
1839 sizeof(pr->pr_osrelease));
1840
1841 #ifdef VIMAGE
1842 /*
1843 * Allocate a new vnet if specified.
1844 *
1845 * Set PR_VNET now if so, so that the vnet is disposed of
1846 * properly when the jail is destroyed.
1847 */
1848 if (pr_flags & PR_VNET) {
1849 pr->pr_flags |= PR_VNET;
1850 pr->pr_vnet = vnet_alloc();
1851 } else {
1852 pr->pr_vnet = ppr->pr_vnet;
1853 }
1854 #endif
1855 /*
1856 * Allocate a dedicated cpuset for each jail.
1857 * Unlike other initial settings, this may return an error.
1858 */
1859 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1860 if (error)
1861 goto done_deref;
1862
1863 #ifdef MAC
1864 error = mac_prison_init(pr, M_WAITOK);
1865 MPASS(error == 0);
1866
1867 mtx_assert(&pr->pr_mtx, MA_OWNED);
1868 #else
1869 mtx_lock(&pr->pr_mtx);
1870 #endif
1871 drflags |= PD_LOCKED;
1872 } else {
1873 /*
1874 * Grab a reference for existing prisons, to ensure they
1875 * continue to exist for the duration of the call.
1876 */
1877 if (!(drflags & PD_DEREF)) {
1878 prison_hold(pr);
1879 drflags |= PD_DEREF;
1880 }
1881 #ifdef MAC
1882 error = mac_prison_check_set(td->td_ucred, pr, opts, flags);
1883 if (error != 0)
1884 goto done_deref;
1885 #endif
1886 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1887 if ((pr->pr_flags & PR_VNET) &&
1888 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1889 error = EINVAL;
1890 vfs_opterror(opts,
1891 "vnet jails cannot have IP address restrictions");
1892 goto done_deref;
1893 }
1894 #endif
1895 #ifdef INET
1896 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1897 error = EINVAL;
1898 vfs_opterror(opts,
1899 "ip4 cannot be changed after creation");
1900 goto done_deref;
1901 }
1902 #endif
1903 #ifdef INET6
1904 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1905 error = EINVAL;
1906 vfs_opterror(opts,
1907 "ip6 cannot be changed after creation");
1908 goto done_deref;
1909 }
1910 #endif
1911 }
1912
1913 /* Do final error checking before setting anything. */
1914 if (gotslevel) {
1915 if (slevel < ppr->pr_securelevel) {
1916 error = EPERM;
1917 goto done_deref;
1918 }
1919 }
1920 if (gotchildmax) {
1921 if (childmax >= ppr->pr_childmax) {
1922 error = EPERM;
1923 goto done_deref;
1924 }
1925 }
1926 if (gotenforce) {
1927 if (enforce < ppr->pr_enforce_statfs) {
1928 error = EPERM;
1929 goto done_deref;
1930 }
1931 }
1932 if (gotrsnum) {
1933 /*
1934 * devfs_rsnum is a uint16_t
1935 */
1936 if (rsnum < 0 || rsnum > 65535) {
1937 error = EINVAL;
1938 goto done_deref;
1939 }
1940 /*
1941 * Nested jails always inherit parent's devfs ruleset
1942 */
1943 if (jailed(td->td_ucred)) {
1944 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
1945 error = EPERM;
1946 goto done_deref;
1947 } else
1948 rsnum = ppr->pr_devfs_rsnum;
1949 }
1950 }
1951 #ifdef INET
1952 if (ip4s > 0) {
1953 if ((ppr->pr_flags & PR_IP4) &&
1954 !prison_ip_parent_match(ppr->pr_addrs[PR_INET], ip4,
1955 PR_INET)) {
1956 error = EPERM;
1957 goto done_deref;
1958 }
1959 if (!prison_ip_conflict_check(ppr, pr, ip4, PR_INET)) {
1960 error = EADDRINUSE;
1961 vfs_opterror(opts, "IPv4 addresses clash");
1962 goto done_deref;
1963 }
1964 }
1965 #endif
1966 #ifdef INET6
1967 if (ip6s > 0) {
1968 if ((ppr->pr_flags & PR_IP6) &&
1969 !prison_ip_parent_match(ppr->pr_addrs[PR_INET6], ip6,
1970 PR_INET6)) {
1971 error = EPERM;
1972 goto done_deref;
1973 }
1974 if (!prison_ip_conflict_check(ppr, pr, ip6, PR_INET6)) {
1975 error = EADDRINUSE;
1976 vfs_opterror(opts, "IPv6 addresses clash");
1977 goto done_deref;
1978 }
1979 }
1980 #endif
1981 onamelen = namelen = 0;
1982 if (namelc != NULL) {
1983 /* Give a default name of the jid. Also allow the name to be
1984 * explicitly the jid - but not any other number, and only in
1985 * normal form (no leading zero/etc).
1986 */
1987 if (namelc[0] == '\0')
1988 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid);
1989 else if ((strtoul(namelc, &p, 10) != jid ||
1990 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') {
1991 error = EINVAL;
1992 vfs_opterror(opts,
1993 "name cannot be numeric (unless it is the jid)");
1994 goto done_deref;
1995 }
1996 /*
1997 * Make sure the name isn't too long for the prison or its
1998 * children.
1999 */
2000 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
2001 onamelen = strlen(pr->pr_name + pnamelen);
2002 namelen = strlen(namelc);
2003 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) {
2004 error = ENAMETOOLONG;
2005 goto done_deref;
2006 }
2007 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
2008 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
2009 sizeof(pr->pr_name)) {
2010 error = ENAMETOOLONG;
2011 goto done_deref;
2012 }
2013 }
2014 }
2015 pr_allow_diff = pr_allow & ~ppr->pr_allow;
2016 if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) {
2017 error = EPERM;
2018 goto done_deref;
2019 }
2020
2021 /*
2022 * Let modules check their parameters. This requires unlocking and
2023 * then re-locking the prison, but this is still a valid state as long
2024 * as allprison_lock remains xlocked.
2025 */
2026 mtx_unlock(&pr->pr_mtx);
2027 drflags &= ~PD_LOCKED;
2028 error = osd_jail_call(pr, PR_METHOD_CHECK, opts);
2029 if (error != 0)
2030 goto done_deref;
2031 mtx_lock(&pr->pr_mtx);
2032 drflags |= PD_LOCKED;
2033
2034 /* At this point, all valid parameters should have been noted. */
2035 TAILQ_FOREACH(opt, opts, link) {
2036 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2037 error = EINVAL;
2038 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2039 goto done_deref;
2040 }
2041 }
2042 maybe_changed = true;
2043
2044 /* Set the parameters of the prison. */
2045 #ifdef INET
2046 redo_ip4 = false;
2047 if (pr_flags & PR_IP4_USER) {
2048 pr->pr_flags |= PR_IP4;
2049 prison_ip_set(pr, PR_INET, ip4);
2050 ip4 = NULL;
2051 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2052 #ifdef VIMAGE
2053 if (tpr->pr_flags & PR_VNET) {
2054 descend = 0;
2055 continue;
2056 }
2057 #endif
2058 if (!prison_ip_restrict(tpr, PR_INET, NULL)) {
2059 redo_ip4 = true;
2060 descend = 0;
2061 }
2062 }
2063 }
2064 #endif
2065 #ifdef INET6
2066 redo_ip6 = false;
2067 if (pr_flags & PR_IP6_USER) {
2068 pr->pr_flags |= PR_IP6;
2069 prison_ip_set(pr, PR_INET6, ip6);
2070 ip6 = NULL;
2071 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2072 #ifdef VIMAGE
2073 if (tpr->pr_flags & PR_VNET) {
2074 descend = 0;
2075 continue;
2076 }
2077 #endif
2078 if (!prison_ip_restrict(tpr, PR_INET6, NULL)) {
2079 redo_ip6 = true;
2080 descend = 0;
2081 }
2082 }
2083 }
2084 #endif
2085 if (gotslevel) {
2086 pr->pr_securelevel = slevel;
2087 /* Set all child jails to be at least this level. */
2088 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
2089 if (tpr->pr_securelevel < slevel)
2090 tpr->pr_securelevel = slevel;
2091 }
2092 if (gotchildmax) {
2093 pr->pr_childmax = childmax;
2094 /* Set all child jails to under this limit. */
2095 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
2096 if (tpr->pr_childmax > childmax - level)
2097 tpr->pr_childmax = childmax > level
2098 ? childmax - level : 0;
2099 }
2100 if (gotenforce) {
2101 pr->pr_enforce_statfs = enforce;
2102 /* Pass this restriction on to the children. */
2103 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
2104 if (tpr->pr_enforce_statfs < enforce)
2105 tpr->pr_enforce_statfs = enforce;
2106 }
2107 if (gotrsnum) {
2108 pr->pr_devfs_rsnum = rsnum;
2109 /* Pass this restriction on to the children. */
2110 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
2111 tpr->pr_devfs_rsnum = rsnum;
2112 }
2113 if (namelc != NULL) {
2114 if (ppr == &prison0)
2115 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name));
2116 else
2117 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
2118 ppr->pr_name, namelc);
2119 /* Change this component of child names. */
2120 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2121 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
2122 strlen(tpr->pr_name + onamelen) + 1);
2123 bcopy(pr->pr_name, tpr->pr_name, namelen);
2124 }
2125 }
2126 if (path != NULL) {
2127 /* Try to keep a real-rooted full pathname. */
2128 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
2129 pr->pr_root = root;
2130 root = NULL;
2131 }
2132 if (PR_HOST & ch_flags & ~pr_flags) {
2133 if (pr->pr_flags & PR_HOST) {
2134 /*
2135 * Copy the parent's host info. As with pr_ip4 above,
2136 * the lack of a lock on the parent is not a problem;
2137 * it is always set with allprison_lock at least
2138 * shared, and is held exclusively here.
2139 */
2140 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
2141 sizeof(pr->pr_hostname));
2142 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
2143 sizeof(pr->pr_domainname));
2144 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
2145 sizeof(pr->pr_hostuuid));
2146 pr->pr_hostid = pr->pr_parent->pr_hostid;
2147 }
2148 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
2149 /* Set this prison, and any descendants without PR_HOST. */
2150 if (host != NULL)
2151 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
2152 if (domain != NULL)
2153 strlcpy(pr->pr_domainname, domain,
2154 sizeof(pr->pr_domainname));
2155 if (uuid != NULL)
2156 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
2157 if (gothid)
2158 pr->pr_hostid = hid;
2159 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2160 if (tpr->pr_flags & PR_HOST)
2161 descend = 0;
2162 else {
2163 if (host != NULL)
2164 strlcpy(tpr->pr_hostname,
2165 pr->pr_hostname,
2166 sizeof(tpr->pr_hostname));
2167 if (domain != NULL)
2168 strlcpy(tpr->pr_domainname,
2169 pr->pr_domainname,
2170 sizeof(tpr->pr_domainname));
2171 if (uuid != NULL)
2172 strlcpy(tpr->pr_hostuuid,
2173 pr->pr_hostuuid,
2174 sizeof(tpr->pr_hostuuid));
2175 if (gothid)
2176 tpr->pr_hostid = hid;
2177 }
2178 }
2179 }
2180 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
2181 if ((tallow = ch_allow & ~pr_allow))
2182 prison_set_allow_locked(pr, tallow, 0);
2183 /*
2184 * Persistent prisons get an extra reference, and prisons losing their
2185 * persist flag lose that reference.
2186 */
2187 if (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags)) {
2188 if (pr_flags & PR_PERSIST) {
2189 prison_hold(pr);
2190 /*
2191 * This may be a new prison's first user reference,
2192 * but wait to call it alive until after OSD calls
2193 * have had a chance to run (and perhaps to fail).
2194 */
2195 refcount_acquire(&pr->pr_uref);
2196 } else {
2197 drflags |= PD_DEUREF;
2198 prison_free_not_last(pr);
2199 }
2200 }
2201 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
2202
2203 #ifdef MAC
2204 /* Apply any request MAC label before we let modules do their work. */
2205 if (gotmaclabel) {
2206 error = mac_set_prison_core(td, pr, mac_set_prison_data);
2207 if (error) {
2208 vfs_opterror(opts, "mac relabel denied");
2209 goto done_deref;
2210 }
2211 }
2212 #endif
2213 mtx_unlock(&pr->pr_mtx);
2214 drflags &= ~PD_LOCKED;
2215 /*
2216 * Any errors past this point will need to de-persist newly created
2217 * prisons, as well as call remove methods.
2218 */
2219 if (created)
2220 drflags |= PD_KILL;
2221
2222 #ifdef RACCT
2223 if (racct_enable && created)
2224 prison_racct_attach(pr);
2225 #endif
2226
2227 /* Locks may have prevented a complete restriction of child IP
2228 * addresses. If so, allocate some more memory and try again.
2229 */
2230 #ifdef INET
2231 while (redo_ip4) {
2232 ip4s = pr->pr_addrs[PR_INET]->ips;
2233 MPASS(ip4 == NULL);
2234 ip4 = prison_ip_alloc(PR_INET, ip4s, M_WAITOK);
2235 mtx_lock(&pr->pr_mtx);
2236 redo_ip4 = false;
2237 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2238 #ifdef VIMAGE
2239 if (tpr->pr_flags & PR_VNET) {
2240 descend = 0;
2241 continue;
2242 }
2243 #endif
2244 if (!prison_ip_restrict(tpr, PR_INET, &ip4))
2245 redo_ip4 = true;
2246 }
2247 mtx_unlock(&pr->pr_mtx);
2248 }
2249 #endif
2250 #ifdef INET6
2251 while (redo_ip6) {
2252 ip6s = pr->pr_addrs[PR_INET6]->ips;
2253 MPASS(ip6 == NULL);
2254 ip6 = prison_ip_alloc(PR_INET6, ip6s, M_WAITOK);
2255 mtx_lock(&pr->pr_mtx);
2256 redo_ip6 = false;
2257 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2258 #ifdef VIMAGE
2259 if (tpr->pr_flags & PR_VNET) {
2260 descend = 0;
2261 continue;
2262 }
2263 #endif
2264 if (!prison_ip_restrict(tpr, PR_INET6, &ip6))
2265 redo_ip6 = true;
2266 }
2267 mtx_unlock(&pr->pr_mtx);
2268 }
2269 #endif
2270
2271 /* Let the modules do their work. */
2272 if (created) {
2273 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
2274 if (error)
2275 goto done_deref;
2276 }
2277 error = osd_jail_call(pr, PR_METHOD_SET, opts);
2278 if (error)
2279 goto done_deref;
2280
2281 /*
2282 * A new prison is now ready to be seen; either it has gained a user
2283 * reference via persistence, or is about to gain one via attachment.
2284 */
2285 if (created) {
2286 sx_assert(&allprison_lock, SX_XLOCKED);
2287 prison_knote(ppr, NOTE_JAIL_CHILD | pr->pr_id);
2288 #ifdef MAC
2289 /*
2290 * Note that mac_prison_created() assumes that it's called in a
2291 * sleepable context.
2292 */
2293 mac_prison_created(td->td_ucred, pr);
2294 #endif
2295 mtx_lock(&pr->pr_mtx);
2296 drflags |= PD_LOCKED;
2297 pr->pr_state = PRISON_STATE_ALIVE;
2298 }
2299
2300 /* Attach this process to the prison if requested. */
2301 if (flags & JAIL_ATTACH) {
2302 #ifdef MAC
2303 error = mac_prison_check_attach(td->td_ucred, pr);
2304 if (error != 0) {
2305 vfs_opterror(opts,
2306 "attach operation denied by MAC policy");
2307 goto done_deref;
2308 }
2309 #endif
2310 error = do_jail_attach(td, pr,
2311 prison_lock_xlock(pr, drflags & PD_LOCK_FLAGS));
2312 drflags &= ~(PD_LOCKED | PD_LIST_XLOCKED);
2313 if (error) {
2314 vfs_opterror(opts, "attach failed");
2315 goto done_deref;
2316 }
2317 }
2318
2319 #ifdef RACCT
2320 if (racct_enable && !created) {
2321 if (drflags & PD_LOCKED) {
2322 mtx_unlock(&pr->pr_mtx);
2323 drflags &= ~PD_LOCKED;
2324 }
2325 if (drflags & PD_LIST_XLOCKED) {
2326 sx_xunlock(&allprison_lock);
2327 drflags &= ~PD_LIST_XLOCKED;
2328 }
2329 prison_racct_modify(pr);
2330 }
2331 #endif
2332
2333 if (created && pr != &prison0 && (pr->pr_allow & PR_ALLOW_NFSD) != 0 &&
2334 (pr->pr_root->v_vflag & VV_ROOT) == 0)
2335 printf("Warning jail jid=%d: mountd/nfsd requires a separate"
2336 " file system\n", pr->pr_id);
2337
2338 /*
2339 * Now that the prison is fully created without error, set the
2340 * jail descriptor if one was requested. This is the only
2341 * parameter that is returned to the caller (except the error
2342 * message).
2343 */
2344 if (jfd_out >= 0) {
2345 if (!(drflags & PD_LOCKED)) {
2346 mtx_lock(&pr->pr_mtx);
2347 drflags |= PD_LOCKED;
2348 }
2349 jfd_pos = 2 * vfs_getopt_pos(opts, "desc") + 1;
2350 if (optuio->uio_segflg == UIO_SYSSPACE)
2351 *(int*)optuio->uio_iov[jfd_pos].iov_base = jfd_out;
2352 else
2353 (void)copyout(&jfd_out,
2354 optuio->uio_iov[jfd_pos].iov_base, sizeof(jfd_out));
2355 jaildesc_set_prison(jfp_out, pr);
2356 }
2357
2358 drflags &= ~PD_KILL;
2359 td->td_retval[0] = pr->pr_id;
2360
2361 done_deref:
2362 /*
2363 * Report changes to kevent. This can happen even if the
2364 * system call fails, as changes might have been made before
2365 * the failure.
2366 */
2367 if (maybe_changed && !created)
2368 prison_knote(pr, NOTE_JAIL_SET);
2369 /* Release any temporary prison holds and/or locks. */
2370 if (pr != NULL)
2371 prison_deref(pr, drflags);
2372 else if (drflags & PD_LIST_SLOCKED)
2373 sx_sunlock(&allprison_lock);
2374 else if (drflags & PD_LIST_XLOCKED)
2375 sx_xunlock(&allprison_lock);
2376 if (root != NULL)
2377 vrele(root);
2378 done_errmsg:
2379 if (error) {
2380 /* Write the error message back to userspace. */
2381 if (vfs_getopt(opts, "errmsg", (void **)&errmsg,
2382 &errmsg_len) == 0 && errmsg_len > 0) {
2383 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
2384 if (optuio->uio_segflg == UIO_SYSSPACE)
2385 bcopy(errmsg,
2386 optuio->uio_iov[errmsg_pos].iov_base,
2387 errmsg_len);
2388 else
2389 (void)copyout(errmsg,
2390 optuio->uio_iov[errmsg_pos].iov_base,
2391 errmsg_len);
2392 }
2393 }
2394 done_free:
2395 /* Clean up other resources. */
2396 #ifdef INET
2397 prison_ip_free(ip4);
2398 #endif
2399 #ifdef INET6
2400 prison_ip_free(ip6);
2401 #endif
2402 #ifdef MAC
2403 if (mac_set_prison_data != NULL)
2404 mac_set_prison_finish(td, error == 0, mac_set_prison_data);
2405 #endif
2406 if (jfp_out != NULL)
2407 fdrop(jfp_out, td);
2408 if (error && jfd_out >= 0)
2409 (void)kern_close(td, jfd_out);
2410 if (g_path != NULL)
2411 free(g_path, M_TEMP);
2412 if (opts != NULL)
2413 vfs_freeopts(opts);
2414 prison_free(mypr);
2415 return (error);
2416 }
2417
2418 /*
2419 * Find the next available prison ID. Return the ID on success, or zero
2420 * on failure. Also set a pointer to the allprison list entry the prison
2421 * should be inserted before.
2422 */
2423 static int
get_next_prid(struct prison ** insprp)2424 get_next_prid(struct prison **insprp)
2425 {
2426 struct prison *inspr;
2427 int jid, maxid;
2428
2429 jid = lastprid % JAIL_MAX + 1;
2430 if (TAILQ_EMPTY(&allprison) ||
2431 TAILQ_LAST(&allprison, prisonlist)->pr_id < jid) {
2432 /*
2433 * A common case is for all jails to be implicitly numbered,
2434 * which means they'll go on the end of the list, at least
2435 * for the first JAIL_MAX times.
2436 */
2437 inspr = NULL;
2438 } else {
2439 /*
2440 * Take two passes through the allprison list: first starting
2441 * with the proposed jid, then ending with it.
2442 */
2443 for (maxid = JAIL_MAX; maxid != 0; ) {
2444 TAILQ_FOREACH(inspr, &allprison, pr_list) {
2445 if (inspr->pr_id < jid)
2446 continue;
2447 if (inspr->pr_id > jid) {
2448 /* Found an opening. */
2449 maxid = 0;
2450 break;
2451 }
2452 if (++jid > maxid) {
2453 if (lastprid == maxid || lastprid == 0)
2454 {
2455 /*
2456 * The entire legal range
2457 * has been traversed
2458 */
2459 return 0;
2460 }
2461 /* Try again from the start. */
2462 jid = 1;
2463 maxid = lastprid;
2464 break;
2465 }
2466 }
2467 if (inspr == NULL) {
2468 /* Found room at the end of the list. */
2469 break;
2470 }
2471 }
2472 }
2473 *insprp = inspr;
2474 lastprid = jid;
2475 return (jid);
2476 }
2477
2478 /*
2479 * Find the next available ID for a renumbered dead prison. This is the same
2480 * as get_next_prid, but counting backward from the end of the range.
2481 */
2482 static int
get_next_deadid(struct prison ** dinsprp)2483 get_next_deadid(struct prison **dinsprp)
2484 {
2485 struct prison *dinspr;
2486 int deadid, minid;
2487
2488 deadid = lastdeadid ? lastdeadid - 1 : JAIL_MAX;
2489 /*
2490 * Take two reverse passes through the allprison list: first
2491 * starting with the proposed deadid, then ending with it.
2492 */
2493 for (minid = 1; minid != 0; ) {
2494 TAILQ_FOREACH_REVERSE(dinspr, &allprison, prisonlist, pr_list) {
2495 if (dinspr->pr_id > deadid)
2496 continue;
2497 if (dinspr->pr_id < deadid) {
2498 /* Found an opening. */
2499 minid = 0;
2500 break;
2501 }
2502 if (--deadid < minid) {
2503 if (lastdeadid == minid || lastdeadid == 0)
2504 {
2505 /*
2506 * The entire legal range
2507 * has been traversed
2508 */
2509 return 0;
2510 }
2511 /* Try again from the end. */
2512 deadid = JAIL_MAX;
2513 minid = lastdeadid;
2514 break;
2515 }
2516 }
2517 if (dinspr == NULL) {
2518 /* Found room at the beginning of the list. */
2519 break;
2520 }
2521 }
2522 *dinsprp = dinspr;
2523 lastdeadid = deadid;
2524 return (deadid);
2525 }
2526
2527 /*
2528 * struct jail_get_args {
2529 * struct iovec *iovp;
2530 * unsigned int iovcnt;
2531 * int flags;
2532 * };
2533 */
2534 int
sys_jail_get(struct thread * td,struct jail_get_args * uap)2535 sys_jail_get(struct thread *td, struct jail_get_args *uap)
2536 {
2537 struct uio *auio;
2538 int error;
2539
2540 /* Check that we have an even number of iovecs. */
2541 if (uap->iovcnt & 1)
2542 return (EINVAL);
2543
2544 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
2545 if (error)
2546 return (error);
2547 error = kern_jail_get(td, auio, uap->flags);
2548 if (error == 0)
2549 error = copyout(auio->uio_iov, uap->iovp,
2550 uap->iovcnt * sizeof(struct iovec));
2551 freeuio(auio);
2552 return (error);
2553 }
2554
2555 int
kern_jail_get(struct thread * td,struct uio * optuio,int flags)2556 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
2557 {
2558 struct bool_flags *bf;
2559 struct file *jfp_out;
2560 struct jailsys_flags *jsf;
2561 struct prison *pr, *mypr;
2562 struct vfsopt *opt;
2563 struct vfsoptlist *opts;
2564 char *errmsg, *name;
2565 int drflags, error, errmsg_len, errmsg_pos, i, jid, len, pos;
2566 int jfd_in, jfd_out;
2567 unsigned f;
2568
2569 if (flags & ~JAIL_GET_MASK)
2570 return (EINVAL);
2571 if ((flags & (JAIL_USE_DESC | JAIL_AT_DESC)) ==
2572 (JAIL_USE_DESC | JAIL_AT_DESC))
2573 return (EINVAL);
2574
2575 /* Get the parameter list. */
2576 error = vfs_buildopts(optuio, &opts);
2577 if (error)
2578 return (error);
2579 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
2580 mypr = td->td_ucred->cr_prison;
2581 prison_hold(mypr);
2582 pr = NULL;
2583 jfp_out = NULL;
2584 jfd_out = -1;
2585
2586 /*
2587 * Find the prison specified by one of: desc, lastjid, jid, name.
2588 */
2589 sx_slock(&allprison_lock);
2590 drflags = PD_LIST_SLOCKED;
2591
2592 error = vfs_copyopt(opts, "desc", &jfd_in, sizeof(jfd_in));
2593 if (error == ENOENT) {
2594 if (flags & (JAIL_AT_DESC | JAIL_GET_DESC | JAIL_OWN_DESC)) {
2595 vfs_opterror(opts, "missing desc");
2596 goto done;
2597 }
2598 } else if (error == 0) {
2599 if (!(flags & (JAIL_USE_DESC | JAIL_AT_DESC | JAIL_GET_DESC |
2600 JAIL_OWN_DESC))) {
2601 error = EINVAL;
2602 vfs_opterror(opts, "unexpected desc");
2603 goto done;
2604 }
2605 if (flags & JAIL_USE_DESC) {
2606 /* Get the jail from its descriptor. */
2607 error = jaildesc_find(td, jfd_in, &pr, NULL);
2608 if (error) {
2609 vfs_opterror(opts, error == ENOENT ?
2610 "descriptor to dead jail" :
2611 "not a jail descriptor");
2612 goto done;
2613 }
2614 drflags |= PD_DEREF;
2615 mtx_lock(&pr->pr_mtx);
2616 drflags |= PD_LOCKED;
2617 goto found_prison;
2618 }
2619 if (flags & JAIL_AT_DESC) {
2620 /* Look up jails based on the descriptor's prison. */
2621 prison_free(mypr);
2622 error = jaildesc_find(td, jfd_in, &mypr, NULL);
2623 if (error != 0) {
2624 vfs_opterror(opts, error == ENOENT ?
2625 "descriptor to dead jail" :
2626 "not a jail descriptor");
2627 goto done;
2628 }
2629 }
2630 if (flags & (JAIL_GET_DESC | JAIL_OWN_DESC)) {
2631 /* Allocate a jail descriptor to return later. */
2632 error = jaildesc_alloc(td, &jfp_out, &jfd_out,
2633 flags & JAIL_OWN_DESC);
2634 if (error)
2635 goto done;
2636 }
2637 } else
2638 goto done;
2639
2640 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
2641 if (error == 0) {
2642 TAILQ_FOREACH(pr, &allprison, pr_list) {
2643 if (pr->pr_id > jid &&
2644 ((flags & JAIL_DYING) || prison_isalive(pr)) &&
2645 prison_ischild(mypr, pr)) {
2646 mtx_lock(&pr->pr_mtx);
2647 drflags |= PD_LOCKED;
2648 #ifdef MAC
2649 /*
2650 * We special-case this one check because we
2651 * don't want MAC to break jail enumeration. We
2652 * need to just move on to the next accessible
2653 * and alive prison.
2654 */
2655 error = mac_prison_check_get(td->td_ucred, pr,
2656 opts, flags);
2657 if (error != 0) {
2658 mtx_unlock(&pr->pr_mtx);
2659 drflags &= ~PD_LOCKED;
2660 continue;
2661 }
2662
2663 /*
2664 * Avoid potentially expensive trip back into
2665 * the MAC framework.
2666 */
2667 goto found_prison_nomac_alive;
2668 #else
2669 goto found_prison;
2670 #endif
2671 }
2672 }
2673 error = ENOENT;
2674 vfs_opterror(opts, "no jail after %d", jid);
2675 goto done;
2676 } else if (error != ENOENT)
2677 goto done;
2678
2679 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
2680 if (error == 0) {
2681 if (jid != 0) {
2682 pr = prison_find_child(mypr, jid);
2683 if (pr != NULL) {
2684 drflags |= PD_LOCKED;
2685 goto found_prison;
2686 }
2687 error = ENOENT;
2688 vfs_opterror(opts, "jail %d not found", jid);
2689 goto done;
2690 }
2691 } else if (error != ENOENT)
2692 goto done;
2693
2694 error = vfs_getopt(opts, "name", (void **)&name, &len);
2695 if (error == 0) {
2696 if (len == 0 || name[len - 1] != '\0') {
2697 error = EINVAL;
2698 goto done;
2699 }
2700 pr = prison_find_name(mypr, name);
2701 if (pr != NULL) {
2702 drflags |= PD_LOCKED;
2703 goto found_prison;
2704 }
2705 error = ENOENT;
2706 vfs_opterror(opts, "jail \"%s\" not found", name);
2707 goto done;
2708 } else if (error != ENOENT)
2709 goto done;
2710
2711 vfs_opterror(opts, "no jail specified");
2712 error = ENOENT;
2713 goto done;
2714
2715 found_prison:
2716 #ifdef MAC
2717 error = mac_prison_check_get(td->td_ucred, pr, opts, flags);
2718 if (error != 0)
2719 goto done;
2720 #endif
2721 if (!(prison_isalive(pr) || (flags & JAIL_DYING))) {
2722 error = ENOENT;
2723 if (pr->pr_name[0] != '0' && isdigit(pr->pr_name[0])) {
2724 vfs_opterror(opts, "jail %d is dying",
2725 pr->pr_id);
2726 } else {
2727 vfs_opterror(opts, "jail \"%s\" (%d) is dying",
2728 pr->pr_name, pr->pr_id);
2729 }
2730 goto done;
2731 }
2732 #ifdef MAC
2733 found_prison_nomac_alive:
2734 #endif
2735 /* Get the parameters of the prison. */
2736 if (!(drflags & PD_DEREF)) {
2737 prison_hold(pr);
2738 drflags |= PD_DEREF;
2739 }
2740 td->td_retval[0] = pr->pr_id;
2741 if (jfd_out >= 0) {
2742 error = vfs_setopt(opts, "desc", &jfd_out, sizeof(jfd_out));
2743 if (error != 0 && error != ENOENT)
2744 goto done;
2745 jaildesc_set_prison(jfp_out, pr);
2746 }
2747 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
2748 if (error != 0 && error != ENOENT)
2749 goto done;
2750 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
2751 error = vfs_setopt(opts, "parent", &i, sizeof(i));
2752 if (error != 0 && error != ENOENT)
2753 goto done;
2754 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
2755 if (error != 0 && error != ENOENT)
2756 goto done;
2757 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
2758 sizeof(pr->pr_cpuset->cs_id));
2759 if (error != 0 && error != ENOENT)
2760 goto done;
2761 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
2762 if (error != 0 && error != ENOENT)
2763 goto done;
2764 #ifdef INET
2765 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_addrs[PR_INET]->pr_ip,
2766 pr->pr_addrs[PR_INET] ? pr->pr_addrs[PR_INET]->ips *
2767 pr_families[PR_INET].size : 0 );
2768 if (error != 0 && error != ENOENT)
2769 goto done;
2770 #endif
2771 #ifdef INET6
2772 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_addrs[PR_INET6]->pr_ip,
2773 pr->pr_addrs[PR_INET6] ? pr->pr_addrs[PR_INET6]->ips *
2774 pr_families[PR_INET6].size : 0 );
2775 if (error != 0 && error != ENOENT)
2776 goto done;
2777 #endif
2778 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
2779 sizeof(pr->pr_securelevel));
2780 if (error != 0 && error != ENOENT)
2781 goto done;
2782 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
2783 sizeof(pr->pr_childcount));
2784 if (error != 0 && error != ENOENT)
2785 goto done;
2786 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
2787 sizeof(pr->pr_childmax));
2788 if (error != 0 && error != ENOENT)
2789 goto done;
2790 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
2791 if (error != 0 && error != ENOENT)
2792 goto done;
2793 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
2794 if (error != 0 && error != ENOENT)
2795 goto done;
2796 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
2797 if (error != 0 && error != ENOENT)
2798 goto done;
2799 #ifdef COMPAT_FREEBSD32
2800 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
2801 uint32_t hid32 = pr->pr_hostid;
2802
2803 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
2804 } else
2805 #endif
2806 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
2807 sizeof(pr->pr_hostid));
2808 if (error != 0 && error != ENOENT)
2809 goto done;
2810 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
2811 sizeof(pr->pr_enforce_statfs));
2812 if (error != 0 && error != ENOENT)
2813 goto done;
2814 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
2815 sizeof(pr->pr_devfs_rsnum));
2816 if (error != 0 && error != ENOENT)
2817 goto done;
2818 for (bf = pr_flag_bool;
2819 bf < pr_flag_bool + nitems(pr_flag_bool);
2820 bf++) {
2821 i = (pr->pr_flags & bf->flag) ? 1 : 0;
2822 error = vfs_setopt(opts, bf->name, &i, sizeof(i));
2823 if (error != 0 && error != ENOENT)
2824 goto done;
2825 i = !i;
2826 error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
2827 if (error != 0 && error != ENOENT)
2828 goto done;
2829 }
2830 for (jsf = pr_flag_jailsys;
2831 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
2832 jsf++) {
2833 f = pr->pr_flags & (jsf->disable | jsf->new);
2834 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE
2835 : (f == jsf->new) ? JAIL_SYS_NEW
2836 : JAIL_SYS_INHERIT;
2837 error = vfs_setopt(opts, jsf->name, &i, sizeof(i));
2838 if (error != 0 && error != ENOENT)
2839 goto done;
2840 }
2841 for (bf = pr_flag_allow;
2842 bf < pr_flag_allow + nitems(pr_flag_allow) &&
2843 atomic_load_int(&bf->flag) != 0;
2844 bf++) {
2845 i = (pr->pr_allow & bf->flag) ? 1 : 0;
2846 error = vfs_setopt(opts, bf->name, &i, sizeof(i));
2847 if (error != 0 && error != ENOENT)
2848 goto done;
2849 i = !i;
2850 error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
2851 if (error != 0 && error != ENOENT)
2852 goto done;
2853 }
2854 i = !prison_isalive(pr);
2855 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2856 if (error != 0 && error != ENOENT)
2857 goto done;
2858 i = !i;
2859 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2860 if (error != 0 && error != ENOENT)
2861 goto done;
2862 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate,
2863 sizeof(pr->pr_osreldate));
2864 if (error != 0 && error != ENOENT)
2865 goto done;
2866 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease);
2867 if (error != 0 && error != ENOENT)
2868 goto done;
2869
2870 #ifdef MAC
2871 /*
2872 * We get the MAC label last because we'll let the MAC framework drop
2873 * pr_mtx to externalize the label.
2874 */
2875 error = mac_get_prison(td, pr, opts);
2876 mtx_assert(&pr->pr_mtx, MA_NOTOWNED);
2877 drflags &= ~PD_LOCKED;
2878 if (error != 0 && error != ENOENT)
2879 goto done;
2880 #else
2881 mtx_unlock(&pr->pr_mtx);
2882 drflags &= ~PD_LOCKED;
2883 #endif
2884
2885 /* Get the module parameters. */
2886 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2887 if (error)
2888 goto done;
2889 prison_deref(pr, drflags);
2890 pr = NULL;
2891 drflags = 0;
2892
2893 /* By now, all parameters should have been noted. */
2894 TAILQ_FOREACH(opt, opts, link) {
2895 if (!opt->seen &&
2896 (strstr(opt->name, JAIL_META_PRIVATE ".") == opt->name ||
2897 strstr(opt->name, JAIL_META_SHARED ".") == opt->name)) {
2898 /* Communicate back a missing key. */
2899 free(opt->value, M_MOUNT);
2900 opt->value = NULL;
2901 opt->len = 0;
2902 continue;
2903 }
2904 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2905 error = EINVAL;
2906 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2907 goto done;
2908 }
2909 }
2910
2911 /* Write the fetched parameters back to userspace. */
2912 error = 0;
2913 TAILQ_FOREACH(opt, opts, link) {
2914 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2915 pos = 2 * opt->pos + 1;
2916 optuio->uio_iov[pos].iov_len = opt->len;
2917 if (opt->value != NULL) {
2918 if (optuio->uio_segflg == UIO_SYSSPACE) {
2919 bcopy(opt->value,
2920 optuio->uio_iov[pos].iov_base,
2921 opt->len);
2922 } else {
2923 error = copyout(opt->value,
2924 optuio->uio_iov[pos].iov_base,
2925 opt->len);
2926 if (error)
2927 break;
2928 }
2929 }
2930 }
2931 }
2932
2933 done:
2934 /* Release any temporary prison holds and/or locks. */
2935 if (pr != NULL)
2936 prison_deref(pr, drflags);
2937 else if (drflags & PD_LIST_SLOCKED)
2938 sx_sunlock(&allprison_lock);
2939 else if (drflags & PD_LIST_XLOCKED)
2940 sx_xunlock(&allprison_lock);
2941 /* Clean up other resources. */
2942 if (jfp_out != NULL)
2943 (void)fdrop(jfp_out, td);
2944 if (error && jfd_out >= 0)
2945 (void)kern_close(td, jfd_out);
2946 if (error && errmsg_pos >= 0) {
2947 /* Write the error message back to userspace. */
2948 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2949 errmsg_pos = 2 * errmsg_pos + 1;
2950 if (errmsg_len > 0) {
2951 if (optuio->uio_segflg == UIO_SYSSPACE)
2952 bcopy(errmsg,
2953 optuio->uio_iov[errmsg_pos].iov_base,
2954 errmsg_len);
2955 else
2956 (void)copyout(errmsg,
2957 optuio->uio_iov[errmsg_pos].iov_base,
2958 errmsg_len);
2959 }
2960 }
2961 vfs_freeopts(opts);
2962 prison_free(mypr);
2963 return (error);
2964 }
2965
2966 /*
2967 * struct jail_remove_args {
2968 * int jid;
2969 * };
2970 */
2971 int
sys_jail_remove(struct thread * td,struct jail_remove_args * uap)2972 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
2973 {
2974 struct prison *pr;
2975 int error;
2976
2977 error = priv_check(td, PRIV_JAIL_REMOVE);
2978 if (error)
2979 return (error);
2980
2981 sx_xlock(&allprison_lock);
2982 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2983 if (pr == NULL) {
2984 sx_xunlock(&allprison_lock);
2985 return (EINVAL);
2986 }
2987 #ifdef MAC
2988 error = mac_prison_check_remove(td->td_ucred, pr);
2989 if (error != 0) {
2990 mtx_unlock(&pr->pr_mtx);
2991 sx_xunlock(&allprison_lock);
2992 return (error);
2993 }
2994 #endif
2995 prison_hold(pr);
2996 prison_remove(pr);
2997 return (0);
2998 }
2999
3000 /*
3001 * struct jail_remove_jd_args {
3002 * int fd;
3003 * };
3004 */
3005 int
sys_jail_remove_jd(struct thread * td,struct jail_remove_jd_args * uap)3006 sys_jail_remove_jd(struct thread *td, struct jail_remove_jd_args *uap)
3007 {
3008 struct prison *pr;
3009 struct ucred *jdcred;
3010 int error;
3011
3012 error = jaildesc_find(td, uap->fd, &pr, &jdcred);
3013 if (error)
3014 return (error);
3015 error = priv_check_cred(jdcred, PRIV_JAIL_REMOVE);
3016 crfree(jdcred);
3017 #ifdef MAC
3018 if (error == 0)
3019 error = mac_prison_check_remove(td->td_ucred, pr);
3020 #endif
3021 if (error) {
3022 prison_free(pr);
3023 return (error);
3024 }
3025 sx_xlock(&allprison_lock);
3026 mtx_lock(&pr->pr_mtx);
3027 prison_remove(pr);
3028 return (0);
3029 }
3030
3031 /*
3032 * Begin the removal process for a prison. The allprison lock should
3033 * be held exclusively, and the prison should be both locked and held.
3034 */
3035 void
prison_remove(struct prison * pr)3036 prison_remove(struct prison *pr)
3037 {
3038 sx_assert(&allprison_lock, SA_XLOCKED);
3039 mtx_assert(&pr->pr_mtx, MA_OWNED);
3040 prison_deref(pr, PD_KILL | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
3041 }
3042
3043 /*
3044 * struct jail_attach_args {
3045 * int jid;
3046 * };
3047 */
3048 int
sys_jail_attach(struct thread * td,struct jail_attach_args * uap)3049 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
3050 {
3051 struct prison *pr;
3052 int error;
3053
3054 error = priv_check(td, PRIV_JAIL_ATTACH);
3055 if (error)
3056 return (error);
3057
3058 sx_slock(&allprison_lock);
3059 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
3060 if (pr == NULL) {
3061 sx_sunlock(&allprison_lock);
3062 return (EINVAL);
3063 }
3064
3065 #ifdef MAC
3066 error = mac_prison_check_attach(td->td_ucred, pr);
3067 if (error != 0)
3068 goto unlock;
3069 #endif
3070
3071 /* Do not allow a process to attach to a prison that is not alive. */
3072 if (!prison_isalive(pr)) {
3073 error = EINVAL;
3074 goto unlock;
3075 }
3076
3077 return (do_jail_attach(td, pr, PD_LOCKED | PD_LIST_SLOCKED));
3078
3079 unlock:
3080
3081 mtx_unlock(&pr->pr_mtx);
3082 sx_sunlock(&allprison_lock);
3083 return (error);
3084 }
3085
3086 /*
3087 * struct jail_attach_jd_args {
3088 * int fd;
3089 * };
3090 */
3091 int
sys_jail_attach_jd(struct thread * td,struct jail_attach_jd_args * uap)3092 sys_jail_attach_jd(struct thread *td, struct jail_attach_jd_args *uap)
3093 {
3094 struct prison *pr;
3095 struct ucred *jdcred;
3096 int drflags, error;
3097
3098 sx_slock(&allprison_lock);
3099 drflags = PD_LIST_SLOCKED;
3100 error = jaildesc_find(td, uap->fd, &pr, &jdcred);
3101 if (error)
3102 goto fail;
3103 drflags |= PD_DEREF;
3104 error = priv_check_cred(jdcred, PRIV_JAIL_ATTACH);
3105 #ifdef MAC
3106 if (error == 0)
3107 error = mac_prison_check_attach(td->td_ucred, pr);
3108 #endif
3109 crfree(jdcred);
3110 if (error)
3111 goto fail;
3112 mtx_lock(&pr->pr_mtx);
3113 drflags |= PD_LOCKED;
3114
3115 /* Do not allow a process to attach to a prison that is not alive. */
3116 if (!prison_isalive(pr)) {
3117 error = EINVAL;
3118 goto fail;
3119 }
3120
3121 return (do_jail_attach(td, pr, drflags));
3122
3123 fail:
3124 prison_deref(pr, drflags);
3125 return (error);
3126 }
3127
3128 static int
do_jail_attach(struct thread * td,struct prison * pr,int drflags)3129 do_jail_attach(struct thread *td, struct prison *pr, int drflags)
3130 {
3131 struct proc *p;
3132 struct ucred *newcred, *oldcred;
3133 int error;
3134
3135 mtx_assert(&pr->pr_mtx, MA_OWNED);
3136 sx_assert(&allprison_lock, SX_LOCKED);
3137 drflags &= PD_LOCK_FLAGS;
3138 /*
3139 * XXX: Note that there is a slight race here if two threads
3140 * in the same privileged process attempt to attach to two
3141 * different jails at the same time. It is important for
3142 * user processes not to do this, or they might end up with
3143 * a process root from one prison, but attached to the jail
3144 * of another.
3145 */
3146 if (!(drflags & PD_DEREF)) {
3147 prison_hold(pr);
3148 drflags |= PD_DEREF;
3149 }
3150 refcount_acquire(&pr->pr_uref);
3151 drflags |= PD_DEUREF;
3152 mtx_unlock(&pr->pr_mtx);
3153 drflags &= ~PD_LOCKED;
3154
3155 /* Let modules do whatever they need to prepare for attaching. */
3156 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
3157 if (error) {
3158 prison_deref(pr, drflags);
3159 return (error);
3160 }
3161 sx_unlock(&allprison_lock);
3162 drflags &= ~(PD_LIST_SLOCKED | PD_LIST_XLOCKED);
3163
3164 /*
3165 * Reparent the newly attached process to this jail.
3166 */
3167 p = td->td_proc;
3168 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
3169 if (error)
3170 goto e_revert_osd;
3171
3172 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
3173 if ((error = change_dir(pr->pr_root, td)) != 0)
3174 goto e_unlock;
3175 #ifdef MAC
3176 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
3177 goto e_unlock;
3178 #endif
3179 VOP_UNLOCK(pr->pr_root);
3180 if ((error = pwd_chroot_chdir(td, pr->pr_root)))
3181 goto e_revert_osd;
3182
3183 newcred = crget();
3184 PROC_LOCK(p);
3185 oldcred = crcopysafe(p, newcred);
3186 newcred->cr_prison = pr;
3187 #ifdef RACCT
3188 racct_proc_ucred_changed(p, oldcred, newcred);
3189 #endif
3190 #ifdef RCTL
3191 crhold(newcred);
3192 #endif
3193 /*
3194 * Takes over 'newcred''s reference, so 'newcred' must not be used
3195 * besides this point except on RCTL where we took an additional
3196 * reference above.
3197 */
3198 proc_set_cred(p, newcred);
3199 setsugid(p);
3200 PROC_UNLOCK(p);
3201 #ifdef RCTL
3202 rctl_proc_ucred_changed(p, newcred);
3203 crfree(newcred);
3204 #endif
3205 prison_proc_relink(oldcred->cr_prison, pr, p);
3206 prison_deref(oldcred->cr_prison, drflags);
3207 crfree(oldcred);
3208 prison_knote(pr, NOTE_JAIL_ATTACH | td->td_proc->p_pid);
3209 #ifdef MAC
3210 /*
3211 * Note that mac_prison_attached() assumes that it's called in a
3212 * sleepable context.
3213 */
3214 mac_prison_attached(td->td_ucred, pr, td->td_proc);
3215 #endif
3216
3217 /*
3218 * If the prison was killed while changing credentials, die along
3219 * with it.
3220 */
3221 if (!prison_isalive(pr)) {
3222 PROC_LOCK(p);
3223 kern_psignal(p, SIGKILL);
3224 PROC_UNLOCK(p);
3225 }
3226
3227 return (0);
3228
3229 e_unlock:
3230 VOP_UNLOCK(pr->pr_root);
3231 e_revert_osd:
3232 /* Tell modules this thread is still in its old jail after all. */
3233 sx_slock(&allprison_lock);
3234 drflags |= PD_LIST_SLOCKED;
3235 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td);
3236 prison_deref(pr, drflags);
3237 return (error);
3238 }
3239
3240 /*
3241 * Returns a locked prison instance, or NULL on failure.
3242 */
3243 struct prison *
prison_find(int prid)3244 prison_find(int prid)
3245 {
3246 struct prison *pr;
3247
3248 sx_assert(&allprison_lock, SX_LOCKED);
3249 TAILQ_FOREACH(pr, &allprison, pr_list) {
3250 if (pr->pr_id < prid)
3251 continue;
3252 if (pr->pr_id > prid)
3253 break;
3254 KASSERT(prison_isvalid(pr), ("Found invalid prison %p", pr));
3255 mtx_lock(&pr->pr_mtx);
3256 return (pr);
3257 }
3258 return (NULL);
3259 }
3260
3261 /*
3262 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
3263 */
3264 struct prison *
prison_find_child(struct prison * mypr,int prid)3265 prison_find_child(struct prison *mypr, int prid)
3266 {
3267 struct prison *pr;
3268 int descend;
3269
3270 sx_assert(&allprison_lock, SX_LOCKED);
3271 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
3272 if (pr->pr_id == prid) {
3273 KASSERT(prison_isvalid(pr),
3274 ("Found invalid prison %p", pr));
3275 mtx_lock(&pr->pr_mtx);
3276 return (pr);
3277 }
3278 }
3279 return (NULL);
3280 }
3281
3282 /*
3283 * Look for the name relative to mypr. Returns a locked prison or NULL.
3284 */
3285 struct prison *
prison_find_name(struct prison * mypr,const char * name)3286 prison_find_name(struct prison *mypr, const char *name)
3287 {
3288 struct prison *pr, *deadpr;
3289 size_t mylen;
3290 int descend;
3291
3292 sx_assert(&allprison_lock, SX_LOCKED);
3293 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
3294 deadpr = NULL;
3295 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
3296 if (!strcmp(pr->pr_name + mylen, name)) {
3297 KASSERT(prison_isvalid(pr),
3298 ("Found invalid prison %p", pr));
3299 if (prison_isalive(pr)) {
3300 mtx_lock(&pr->pr_mtx);
3301 return (pr);
3302 }
3303 deadpr = pr;
3304 }
3305 }
3306 /* There was no valid prison - perhaps there was a dying one. */
3307 if (deadpr != NULL)
3308 mtx_lock(&deadpr->pr_mtx);
3309 return (deadpr);
3310 }
3311
3312 /*
3313 * See if a prison has the specific flag set. The prison should be locked,
3314 * unless checking for flags that are only set at jail creation (such as
3315 * PR_IP4 and PR_IP6), or only the single bit is examined, without regard
3316 * to any other prison data.
3317 */
3318 bool
prison_flag(struct ucred * cred,unsigned flag)3319 prison_flag(struct ucred *cred, unsigned flag)
3320 {
3321
3322 return ((cred->cr_prison->pr_flags & flag) != 0);
3323 }
3324
3325 /*
3326 * See if a prison has the specific allow flag set.
3327 * The prison *should* be locked, or only a single bit is examined, without
3328 * regard to any other prison data.
3329 */
3330 bool
prison_allow(struct ucred * cred,unsigned flag)3331 prison_allow(struct ucred *cred, unsigned flag)
3332 {
3333
3334 return ((cred->cr_prison->pr_allow & flag) != 0);
3335 }
3336
3337 /*
3338 * Hold a prison reference, by incrementing pr_ref. It is generally
3339 * an error to hold a prison that does not already have a reference.
3340 * A prison record will remain valid as long as it has at least one
3341 * reference, and will not be removed as long as either the prison
3342 * mutex or the allprison lock is held (allprison_lock may be shared).
3343 */
3344 void
prison_hold_locked(struct prison * pr)3345 prison_hold_locked(struct prison *pr)
3346 {
3347
3348 /* Locking is no longer required. */
3349 prison_hold(pr);
3350 }
3351
3352 void
prison_hold(struct prison * pr)3353 prison_hold(struct prison *pr)
3354 {
3355 #ifdef INVARIANTS
3356 int was_valid = refcount_acquire_if_not_zero(&pr->pr_ref);
3357
3358 KASSERT(was_valid,
3359 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id));
3360 #else
3361 refcount_acquire(&pr->pr_ref);
3362 #endif
3363 }
3364
3365 /*
3366 * Remove a prison reference. If that was the last reference, the
3367 * prison will be removed (at a later time).
3368 */
3369 void
prison_free_locked(struct prison * pr)3370 prison_free_locked(struct prison *pr)
3371 {
3372
3373 mtx_assert(&pr->pr_mtx, MA_OWNED);
3374 /*
3375 * Locking is no longer required, but unlock because the caller
3376 * expects it.
3377 */
3378 mtx_unlock(&pr->pr_mtx);
3379 prison_free(pr);
3380 }
3381
3382 void
prison_free(struct prison * pr)3383 prison_free(struct prison *pr)
3384 {
3385
3386 KASSERT(refcount_load(&pr->pr_ref) > 0,
3387 ("Trying to free dead prison %p (jid=%d).",
3388 pr, pr->pr_id));
3389 if (!refcount_release_if_not_last(&pr->pr_ref)) {
3390 /*
3391 * Don't remove the last reference in this context,
3392 * in case there are locks held.
3393 */
3394 taskqueue_enqueue(taskqueue_jail_remove, &pr->pr_task);
3395 }
3396 }
3397
3398 static void
prison_free_not_last(struct prison * pr)3399 prison_free_not_last(struct prison *pr)
3400 {
3401 #ifdef INVARIANTS
3402 int lastref;
3403
3404 KASSERT(refcount_load(&pr->pr_ref) > 0,
3405 ("Trying to free dead prison %p (jid=%d).",
3406 pr, pr->pr_id));
3407 lastref = refcount_release(&pr->pr_ref);
3408 KASSERT(!lastref,
3409 ("prison_free_not_last freed last ref on prison %p (jid=%d).",
3410 pr, pr->pr_id));
3411 #else
3412 refcount_release(&pr->pr_ref);
3413 #endif
3414 }
3415
3416 /*
3417 * Hold a prison for user visibility, by incrementing pr_uref.
3418 * It is generally an error to hold a prison that isn't already
3419 * user-visible, except through the jail system calls. It is also
3420 * an error to hold an invalid prison. A prison record will remain
3421 * alive as long as it has at least one user reference, and will not
3422 * be set to the dying state until the prison mutex and allprison_lock
3423 * are both freed.
3424 */
3425 void
prison_proc_hold(struct prison * pr)3426 prison_proc_hold(struct prison *pr)
3427 {
3428 #ifdef INVARIANTS
3429 int was_alive = refcount_acquire_if_not_zero(&pr->pr_uref);
3430
3431 KASSERT(was_alive,
3432 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
3433 #else
3434 refcount_acquire(&pr->pr_uref);
3435 #endif
3436 }
3437
3438 /*
3439 * Remove a prison user reference. If it was the last reference, the
3440 * prison will be considered "dying", and may be removed once all of
3441 * its references are dropped.
3442 */
3443 void
prison_proc_free(struct prison * pr)3444 prison_proc_free(struct prison *pr)
3445 {
3446
3447 /*
3448 * Locking is only required when releasing the last reference.
3449 * This allows assurance that a locked prison will remain alive
3450 * until it is unlocked.
3451 */
3452 KASSERT(refcount_load(&pr->pr_uref) > 0,
3453 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
3454 if (!refcount_release_if_not_last(&pr->pr_uref)) {
3455 /*
3456 * Don't remove the last user reference in this context,
3457 * which is expected to be a process that is not only locked,
3458 * but also half dead. Add a reference so any calls to
3459 * prison_free() won't re-submit the task.
3460 */
3461 prison_hold(pr);
3462 mtx_lock(&pr->pr_mtx);
3463 KASSERT(!(pr->pr_flags & PR_COMPLETE_PROC),
3464 ("Redundant last reference in prison_proc_free (jid=%d)",
3465 pr->pr_id));
3466 pr->pr_flags |= PR_COMPLETE_PROC;
3467 mtx_unlock(&pr->pr_mtx);
3468 taskqueue_enqueue(taskqueue_jail_remove, &pr->pr_task);
3469 }
3470 }
3471
3472 static void
prison_proc_free_not_last(struct prison * pr)3473 prison_proc_free_not_last(struct prison *pr)
3474 {
3475 #ifdef INVARIANTS
3476 int lastref;
3477
3478 KASSERT(refcount_load(&pr->pr_uref) > 0,
3479 ("Trying to free dead prison %p (jid=%d).",
3480 pr, pr->pr_id));
3481 lastref = refcount_release(&pr->pr_uref);
3482 KASSERT(!lastref,
3483 ("prison_proc_free_not_last freed last uref on prison %p (jid=%d).",
3484 pr, pr->pr_id));
3485 #else
3486 refcount_release(&pr->pr_uref);
3487 #endif
3488 }
3489
3490 void
prison_proc_link(struct prison * pr,struct proc * p)3491 prison_proc_link(struct prison *pr, struct proc *p)
3492 {
3493
3494 sx_assert(&allproc_lock, SA_XLOCKED);
3495 LIST_INSERT_HEAD(&pr->pr_proclist, p, p_jaillist);
3496 }
3497
3498 void
prison_proc_unlink(struct prison * pr,struct proc * p)3499 prison_proc_unlink(struct prison *pr, struct proc *p)
3500 {
3501
3502 sx_assert(&allproc_lock, SA_XLOCKED);
3503 LIST_REMOVE(p, p_jaillist);
3504 }
3505
3506 static void
prison_proc_relink(struct prison * opr,struct prison * npr,struct proc * p)3507 prison_proc_relink(struct prison *opr, struct prison *npr, struct proc *p)
3508 {
3509
3510 sx_xlock(&allproc_lock);
3511 prison_proc_unlink(opr, p);
3512 prison_proc_link(npr, p);
3513 sx_xunlock(&allproc_lock);
3514 }
3515
3516 /*
3517 * Complete a call to either prison_free or prison_proc_free.
3518 */
3519 static void
prison_complete(void * context,int pending)3520 prison_complete(void *context, int pending)
3521 {
3522 struct prison *pr = context;
3523 int drflags;
3524
3525 /*
3526 * This could be called to release the last reference, or the last
3527 * user reference (plus the reference held in prison_proc_free).
3528 */
3529 drflags = prison_lock_xlock(pr, PD_DEREF);
3530 if (pr->pr_flags & PR_COMPLETE_PROC) {
3531 pr->pr_flags &= ~PR_COMPLETE_PROC;
3532 drflags |= PD_DEUREF;
3533 }
3534 prison_deref(pr, drflags);
3535 }
3536
3537 static void
prison_kill_processes_cb(struct proc * p,void * arg __unused)3538 prison_kill_processes_cb(struct proc *p, void *arg __unused)
3539 {
3540
3541 kern_psignal(p, SIGKILL);
3542 }
3543
3544 /*
3545 * Note the iteration does not guarantee acting on all processes.
3546 * Most notably there may be fork or jail_attach in progress.
3547 */
3548 void
prison_proc_iterate(struct prison * pr,void (* cb)(struct proc *,void *),void * cbarg)3549 prison_proc_iterate(struct prison *pr, void (*cb)(struct proc *, void *),
3550 void *cbarg)
3551 {
3552 struct prison *ppr;
3553 struct proc *p;
3554
3555 if (atomic_load_int(&pr->pr_childcount) == 0) {
3556 sx_slock(&allproc_lock);
3557 LIST_FOREACH(p, &pr->pr_proclist, p_jaillist) {
3558 if (p->p_state == PRS_NEW)
3559 continue;
3560 PROC_LOCK(p);
3561 cb(p, cbarg);
3562 PROC_UNLOCK(p);
3563 }
3564 sx_sunlock(&allproc_lock);
3565 if (atomic_load_int(&pr->pr_childcount) == 0)
3566 return;
3567 /*
3568 * Some jails popped up during the iteration, fall through to a
3569 * system-wide search.
3570 */
3571 }
3572
3573 sx_slock(&allproc_lock);
3574 FOREACH_PROC_IN_SYSTEM(p) {
3575 PROC_LOCK(p);
3576 if (p->p_state != PRS_NEW && p->p_ucred != NULL) {
3577 for (ppr = p->p_ucred->cr_prison; ppr != NULL;
3578 ppr = ppr->pr_parent) {
3579 if (ppr == pr) {
3580 cb(p, cbarg);
3581 break;
3582 }
3583 }
3584 }
3585 PROC_UNLOCK(p);
3586 }
3587 sx_sunlock(&allproc_lock);
3588 }
3589
3590 /*
3591 * Remove a prison reference and/or user reference (usually).
3592 * This assumes context that allows sleeping (for allprison_lock),
3593 * with no non-sleeping locks held, except perhaps the prison itself.
3594 * If there are no more references, release and delist the prison.
3595 * On completion, the prison lock and the allprison lock are both
3596 * unlocked.
3597 */
3598 static void
prison_deref(struct prison * pr,int flags)3599 prison_deref(struct prison *pr, int flags)
3600 {
3601 struct prisonlist freeprison;
3602 struct prison *killpr, *rpr, *ppr, *tpr;
3603
3604 killpr = NULL;
3605 TAILQ_INIT(&freeprison);
3606 /*
3607 * Release this prison as requested, which may cause its parent
3608 * to be released, and then maybe its grandparent, etc.
3609 */
3610 for (;;) {
3611 if (flags & PD_KILL) {
3612 /* Kill the prison and its descendents. */
3613 KASSERT(pr != &prison0,
3614 ("prison_deref trying to kill prison0"));
3615 if (!prison_isalive(pr)) {
3616 /* Silently ignore already-dying prisons. */
3617 flags &= ~PD_KILL;
3618 } else {
3619 if (!(flags & PD_DEREF)) {
3620 prison_hold(pr);
3621 flags |= PD_DEREF;
3622 }
3623 flags = prison_lock_xlock(pr, flags);
3624 prison_deref_kill(pr, &freeprison);
3625 }
3626 }
3627 if (flags & PD_DEUREF) {
3628 /* Drop a user reference. */
3629 KASSERT(refcount_load(&pr->pr_uref) > 0,
3630 ("prison_deref PD_DEUREF on a dead prison (jid=%d)",
3631 pr->pr_id));
3632 if (!refcount_release_if_not_last(&pr->pr_uref)) {
3633 if (!(flags & PD_DEREF)) {
3634 prison_hold(pr);
3635 flags |= PD_DEREF;
3636 }
3637 flags = prison_lock_xlock(pr, flags);
3638 if (refcount_release(&pr->pr_uref) &&
3639 pr->pr_state == PRISON_STATE_ALIVE) {
3640 /*
3641 * When the last user references goes,
3642 * this becomes a dying prison.
3643 */
3644 KASSERT(
3645 refcount_load(&prison0.pr_uref) > 0,
3646 ("prison0 pr_uref=0"));
3647 pr->pr_state = PRISON_STATE_DYING;
3648 prison_cleanup_locked(pr);
3649 mtx_unlock(&pr->pr_mtx);
3650 flags &= ~PD_LOCKED;
3651 prison_cleanup_unlocked(pr);
3652 }
3653 }
3654 }
3655 if (flags & PD_KILL) {
3656 /*
3657 * Any remaining user references are probably processes
3658 * that need to be killed, either in this prison or its
3659 * descendants.
3660 */
3661 if (refcount_load(&pr->pr_uref) > 0)
3662 killpr = pr;
3663 /* Make sure the parent prison doesn't get killed. */
3664 flags &= ~PD_KILL;
3665 }
3666 if (flags & PD_DEREF) {
3667 /* Drop a reference. */
3668 KASSERT(refcount_load(&pr->pr_ref) > 0,
3669 ("prison_deref PD_DEREF on a dead prison (jid=%d)",
3670 pr->pr_id));
3671 if (!refcount_release_if_not_last(&pr->pr_ref)) {
3672 flags = prison_lock_xlock(pr, flags);
3673 if (refcount_release(&pr->pr_ref)) {
3674 /*
3675 * When the last reference goes,
3676 * unlink the prison and set it aside.
3677 */
3678 KASSERT(
3679 refcount_load(&pr->pr_uref) == 0,
3680 ("prison_deref: last ref, "
3681 "but still has %d urefs (jid=%d)",
3682 pr->pr_uref, pr->pr_id));
3683 KASSERT(
3684 refcount_load(&prison0.pr_ref) != 0,
3685 ("prison0 pr_ref=0"));
3686 #ifdef MAC
3687 /*
3688 * The MAC framework will call into any
3689 * policies that want to hook
3690 * prison_destroy_label, so ideally we
3691 * call this prior to any final state
3692 * invalidation to be safe.
3693 */
3694 mac_prison_destroy(pr);
3695 #endif
3696 pr->pr_state = PRISON_STATE_INVALID;
3697 TAILQ_REMOVE(&allprison, pr, pr_list);
3698 LIST_REMOVE(pr, pr_sibling);
3699 TAILQ_INSERT_TAIL(&freeprison, pr,
3700 pr_list);
3701 for (ppr = pr->pr_parent;
3702 ppr != NULL;
3703 ppr = ppr->pr_parent)
3704 ppr->pr_childcount--;
3705 /*
3706 * Removing a prison frees references
3707 * from its parent.
3708 */
3709 ppr = pr->pr_parent;
3710 pr->pr_parent = NULL;
3711 mtx_unlock(&pr->pr_mtx);
3712
3713 pr = ppr;
3714 flags &= ~PD_LOCKED;
3715 flags |= PD_DEREF | PD_DEUREF;
3716 continue;
3717 }
3718 }
3719 }
3720 break;
3721 }
3722
3723 /* Release all the prison locks. */
3724 if (flags & PD_LOCKED)
3725 mtx_unlock(&pr->pr_mtx);
3726 if (flags & PD_LIST_SLOCKED)
3727 sx_sunlock(&allprison_lock);
3728 else if (flags & PD_LIST_XLOCKED)
3729 sx_xunlock(&allprison_lock);
3730
3731 /* Kill any processes attached to a killed prison. */
3732 if (killpr != NULL)
3733 prison_proc_iterate(killpr, prison_kill_processes_cb, NULL);
3734
3735 /*
3736 * Finish removing any unreferenced prisons, which couldn't happen
3737 * while allprison_lock was held (to avoid a LOR on vrele).
3738 */
3739 TAILQ_FOREACH_SAFE(rpr, &freeprison, pr_list, tpr) {
3740 #ifdef VIMAGE
3741 if (rpr->pr_flags & PR_VNET)
3742 vnet_destroy(rpr->pr_vnet);
3743 #endif
3744 if (rpr->pr_root != NULL)
3745 vrele(rpr->pr_root);
3746 mtx_destroy(&rpr->pr_mtx);
3747 #ifdef INET
3748 prison_ip_free(rpr->pr_addrs[PR_INET]);
3749 #endif
3750 #ifdef INET6
3751 prison_ip_free(rpr->pr_addrs[PR_INET6]);
3752 #endif
3753 if (rpr->pr_cpuset != NULL)
3754 cpuset_rel(rpr->pr_cpuset);
3755 osd_jail_exit(rpr);
3756 #ifdef RACCT
3757 if (racct_enable)
3758 prison_racct_detach(rpr);
3759 #endif
3760 TAILQ_REMOVE(&freeprison, rpr, pr_list);
3761 free(rpr, M_PRISON);
3762 }
3763 }
3764
3765 /*
3766 * Kill the prison and its descendants. Mark them as dying, clear the
3767 * persist flag, and call module remove methods.
3768 */
3769 static void
prison_deref_kill(struct prison * pr,struct prisonlist * freeprison)3770 prison_deref_kill(struct prison *pr, struct prisonlist *freeprison)
3771 {
3772 struct prison *cpr, *ppr, *rpr;
3773 bool descend;
3774
3775 /*
3776 * Unlike the descendants, the target prison can be killed
3777 * even if it is currently dying. This is useful for failed
3778 * creation in jail_set(2).
3779 */
3780 KASSERT(refcount_load(&pr->pr_ref) > 0,
3781 ("Trying to kill dead prison %p (jid=%d).",
3782 pr, pr->pr_id));
3783 refcount_acquire(&pr->pr_uref);
3784 pr->pr_state = PRISON_STATE_DYING;
3785 mtx_unlock(&pr->pr_mtx);
3786
3787 rpr = NULL;
3788 FOREACH_PRISON_DESCENDANT_PRE_POST(pr, cpr, descend) {
3789 if (descend) {
3790 if (!prison_isalive(cpr)) {
3791 descend = false;
3792 continue;
3793 }
3794 prison_hold(cpr);
3795 prison_proc_hold(cpr);
3796 mtx_lock(&cpr->pr_mtx);
3797 cpr->pr_state = PRISON_STATE_DYING;
3798 cpr->pr_flags |= PR_REMOVE;
3799 mtx_unlock(&cpr->pr_mtx);
3800 continue;
3801 }
3802 if (!(cpr->pr_flags & PR_REMOVE))
3803 continue;
3804 prison_cleanup_unlocked(cpr);
3805 mtx_lock(&cpr->pr_mtx);
3806 prison_cleanup_locked(cpr);
3807 cpr->pr_flags &= ~PR_REMOVE;
3808 if (cpr->pr_flags & PR_PERSIST) {
3809 cpr->pr_flags &= ~PR_PERSIST;
3810 prison_proc_free_not_last(cpr);
3811 prison_free_not_last(cpr);
3812 }
3813 (void)refcount_release(&cpr->pr_uref);
3814 if (refcount_release(&cpr->pr_ref)) {
3815 /*
3816 * When the last reference goes, unlink the prison
3817 * and set it aside for prison_deref() to handle.
3818 * Delay unlinking the sibling list to keep the loop
3819 * safe.
3820 */
3821 if (rpr != NULL)
3822 LIST_REMOVE(rpr, pr_sibling);
3823 rpr = cpr;
3824 rpr->pr_state = PRISON_STATE_INVALID;
3825 TAILQ_REMOVE(&allprison, rpr, pr_list);
3826 TAILQ_INSERT_TAIL(freeprison, rpr, pr_list);
3827 /*
3828 * Removing a prison frees references from its parent.
3829 */
3830 ppr = rpr->pr_parent;
3831 prison_proc_free_not_last(ppr);
3832 prison_free_not_last(ppr);
3833 for (; ppr != NULL; ppr = ppr->pr_parent)
3834 ppr->pr_childcount--;
3835 }
3836 mtx_unlock(&cpr->pr_mtx);
3837 }
3838 if (rpr != NULL)
3839 LIST_REMOVE(rpr, pr_sibling);
3840
3841 prison_cleanup_unlocked(pr);
3842 mtx_lock(&pr->pr_mtx);
3843 prison_cleanup_locked(pr);
3844 if (pr->pr_flags & PR_PERSIST) {
3845 pr->pr_flags &= ~PR_PERSIST;
3846 prison_proc_free_not_last(pr);
3847 prison_free_not_last(pr);
3848 }
3849 (void)refcount_release(&pr->pr_uref);
3850 }
3851
3852 /*
3853 * Given the current locking state in the flags, make sure allprison_lock
3854 * is held exclusive, and the prison is locked. Return flags indicating
3855 * the new state.
3856 */
3857 static int
prison_lock_xlock(struct prison * pr,int flags)3858 prison_lock_xlock(struct prison *pr, int flags)
3859 {
3860
3861 if (!(flags & PD_LIST_XLOCKED)) {
3862 /*
3863 * Get allprison_lock, which may be an upgrade,
3864 * and may require unlocking the prison.
3865 */
3866 if (flags & PD_LOCKED) {
3867 mtx_unlock(&pr->pr_mtx);
3868 flags &= ~PD_LOCKED;
3869 }
3870 if (flags & PD_LIST_SLOCKED) {
3871 if (!sx_try_upgrade(&allprison_lock)) {
3872 sx_sunlock(&allprison_lock);
3873 sx_xlock(&allprison_lock);
3874 }
3875 flags &= ~PD_LIST_SLOCKED;
3876 } else
3877 sx_xlock(&allprison_lock);
3878 flags |= PD_LIST_XLOCKED;
3879 }
3880 if (!(flags & PD_LOCKED)) {
3881 /* Lock the prison mutex. */
3882 mtx_lock(&pr->pr_mtx);
3883 flags |= PD_LOCKED;
3884 }
3885 return flags;
3886 }
3887
3888 /*
3889 * Release a prison's resources when it starts dying (when the last user
3890 * reference is dropped, or when it is killed). Two functions are called,
3891 * for work that requires a locked prison or an unlocked one.
3892 */
3893 static void
prison_cleanup_locked(struct prison * pr)3894 prison_cleanup_locked(struct prison *pr)
3895 {
3896 sx_assert(&allprison_lock, SA_XLOCKED);
3897 mtx_assert(&pr->pr_mtx, MA_OWNED);
3898 prison_knote(pr, NOTE_JAIL_REMOVE);
3899 knlist_detach(pr->pr_klist);
3900 jaildesc_prison_cleanup(pr);
3901 pr->pr_klist = NULL;
3902 }
3903
3904 static void
prison_cleanup_unlocked(struct prison * pr)3905 prison_cleanup_unlocked(struct prison *pr)
3906 {
3907 sx_assert(&allprison_lock, SA_XLOCKED);
3908 mtx_assert(&pr->pr_mtx, MA_NOTOWNED);
3909 vfs_exjail_delete(pr);
3910 shm_remove_prison(pr);
3911 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
3912 }
3913
3914 /*
3915 * Set or clear a permission bit in the pr_allow field, passing restrictions
3916 * (cleared permission) down to child jails.
3917 */
3918 void
prison_set_allow(struct ucred * cred,unsigned flag,int enable)3919 prison_set_allow(struct ucred *cred, unsigned flag, int enable)
3920 {
3921 struct prison *pr;
3922
3923 pr = cred->cr_prison;
3924 sx_slock(&allprison_lock);
3925 mtx_lock(&pr->pr_mtx);
3926 prison_set_allow_locked(pr, flag, enable);
3927 mtx_unlock(&pr->pr_mtx);
3928 sx_sunlock(&allprison_lock);
3929 }
3930
3931 static void
prison_set_allow_locked(struct prison * pr,unsigned flag,int enable)3932 prison_set_allow_locked(struct prison *pr, unsigned flag, int enable)
3933 {
3934 struct prison *cpr;
3935 int descend;
3936
3937 if (enable != 0)
3938 pr->pr_allow |= flag;
3939 else {
3940 pr->pr_allow &= ~flag;
3941 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
3942 cpr->pr_allow &= ~flag;
3943 }
3944 }
3945
3946 /*
3947 * Check if a jail supports the given address family.
3948 *
3949 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
3950 * if not.
3951 */
3952 int
prison_check_af(struct ucred * cred,int af)3953 prison_check_af(struct ucred *cred, int af)
3954 {
3955 struct prison *pr;
3956 int error;
3957
3958 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3959
3960 pr = cred->cr_prison;
3961 #ifdef VIMAGE
3962 /* Prisons with their own network stack are not limited. */
3963 if (prison_owns_vnet(pr))
3964 return (0);
3965 #endif
3966
3967 error = 0;
3968 switch (af)
3969 {
3970 #ifdef INET
3971 case AF_INET:
3972 if (pr->pr_flags & PR_IP4)
3973 {
3974 mtx_lock(&pr->pr_mtx);
3975 if ((pr->pr_flags & PR_IP4) &&
3976 pr->pr_addrs[PR_INET] == NULL)
3977 error = EAFNOSUPPORT;
3978 mtx_unlock(&pr->pr_mtx);
3979 }
3980 break;
3981 #endif
3982 #ifdef INET6
3983 case AF_INET6:
3984 if (pr->pr_flags & PR_IP6)
3985 {
3986 mtx_lock(&pr->pr_mtx);
3987 if ((pr->pr_flags & PR_IP6) &&
3988 pr->pr_addrs[PR_INET6] == NULL)
3989 error = EAFNOSUPPORT;
3990 mtx_unlock(&pr->pr_mtx);
3991 }
3992 break;
3993 #endif
3994 case AF_LOCAL:
3995 case AF_ROUTE:
3996 case AF_NETLINK:
3997 break;
3998 default:
3999 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
4000 error = EAFNOSUPPORT;
4001 }
4002 return (error);
4003 }
4004
4005 /*
4006 * Check if given address belongs to the jail referenced by cred (wrapper to
4007 * prison_check_ip[46]).
4008 *
4009 * Returns 0 if jail doesn't restrict the address family or if address belongs
4010 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
4011 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
4012 */
4013 int
prison_if(struct ucred * cred,const struct sockaddr * sa)4014 prison_if(struct ucred *cred, const struct sockaddr *sa)
4015 {
4016 #ifdef INET
4017 const struct sockaddr_in *sai;
4018 #endif
4019 #ifdef INET6
4020 const struct sockaddr_in6 *sai6;
4021 #endif
4022 int error;
4023
4024 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
4025 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
4026
4027 #ifdef VIMAGE
4028 if (prison_owns_vnet(cred->cr_prison))
4029 return (0);
4030 #endif
4031
4032 error = 0;
4033 switch (sa->sa_family)
4034 {
4035 #ifdef INET
4036 case AF_INET:
4037 sai = (const struct sockaddr_in *)sa;
4038 error = prison_check_ip4(cred, &sai->sin_addr);
4039 break;
4040 #endif
4041 #ifdef INET6
4042 case AF_INET6:
4043 sai6 = (const struct sockaddr_in6 *)sa;
4044 error = prison_check_ip6(cred, &sai6->sin6_addr);
4045 break;
4046 #endif
4047 default:
4048 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
4049 error = EAFNOSUPPORT;
4050 }
4051 return (error);
4052 }
4053
4054 /*
4055 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
4056 */
4057 int
prison_check(struct ucred * cred1,struct ucred * cred2)4058 prison_check(struct ucred *cred1, struct ucred *cred2)
4059 {
4060
4061 return ((cred1->cr_prison == cred2->cr_prison ||
4062 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
4063 }
4064
4065 /*
4066 * For mountd/nfsd to run within a prison, it must be:
4067 * - A vnet prison.
4068 * - PR_ALLOW_NFSD must be set on it.
4069 * - The root directory (pr_root) of the prison must be
4070 * a file system mount point, so the mountd can hang
4071 * export information on it.
4072 * - The prison's enforce_statfs cannot be 0, so that
4073 * mountd(8) can do exports.
4074 */
4075 bool
prison_check_nfsd(struct ucred * cred)4076 prison_check_nfsd(struct ucred *cred)
4077 {
4078
4079 if (jailed_without_vnet(cred))
4080 return (false);
4081 if (!prison_allow(cred, PR_ALLOW_NFSD))
4082 return (false);
4083 if ((cred->cr_prison->pr_root->v_vflag & VV_ROOT) == 0)
4084 return (false);
4085 if (cred->cr_prison->pr_enforce_statfs == 0)
4086 return (false);
4087 return (true);
4088 }
4089
4090 /*
4091 * Return true if p2 is a child of p1, otherwise false.
4092 */
4093 bool
prison_ischild(struct prison * pr1,struct prison * pr2)4094 prison_ischild(struct prison *pr1, struct prison *pr2)
4095 {
4096
4097 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
4098 if (pr1 == pr2)
4099 return (true);
4100 return (false);
4101 }
4102
4103 /*
4104 * Return true if the prison is currently alive. A prison is alive if it
4105 * holds user references and it isn't being removed.
4106 */
4107 bool
prison_isalive(const struct prison * pr)4108 prison_isalive(const struct prison *pr)
4109 {
4110
4111 if (__predict_false(pr->pr_state != PRISON_STATE_ALIVE))
4112 return (false);
4113 return (true);
4114 }
4115
4116 /*
4117 * Return true if the prison is currently valid. A prison is valid if it has
4118 * been fully created, and is not being destroyed. Note that dying prisons
4119 * are still considered valid. Invalid prisons won't be found under normal
4120 * circumstances, as they're only put in that state by functions that have
4121 * an exclusive hold on allprison_lock.
4122 */
4123 bool
prison_isvalid(struct prison * pr)4124 prison_isvalid(struct prison *pr)
4125 {
4126
4127 if (__predict_false(pr->pr_state == PRISON_STATE_INVALID))
4128 return (false);
4129 if (__predict_false(refcount_load(&pr->pr_ref) == 0))
4130 return (false);
4131 return (true);
4132 }
4133
4134 /*
4135 * Return true if the passed credential is in a jail and that jail does not
4136 * have its own virtual network stack, otherwise false.
4137 */
4138 bool
jailed_without_vnet(struct ucred * cred)4139 jailed_without_vnet(struct ucred *cred)
4140 {
4141
4142 if (!jailed(cred))
4143 return (false);
4144 #ifdef VIMAGE
4145 if (prison_owns_vnet(cred->cr_prison))
4146 return (false);
4147 #endif
4148
4149 return (true);
4150 }
4151
4152 /*
4153 * Return the correct hostname (domainname, et al) for the passed credential.
4154 */
4155 void
getcredhostname(struct ucred * cred,char * buf,size_t size)4156 getcredhostname(struct ucred *cred, char *buf, size_t size)
4157 {
4158 struct prison *pr;
4159
4160 /*
4161 * A NULL credential can be used to shortcut to the physical
4162 * system's hostname.
4163 */
4164 pr = (cred != NULL) ? cred->cr_prison : &prison0;
4165 mtx_lock(&pr->pr_mtx);
4166 strlcpy(buf, pr->pr_hostname, size);
4167 mtx_unlock(&pr->pr_mtx);
4168 }
4169
4170 void
getcreddomainname(struct ucred * cred,char * buf,size_t size)4171 getcreddomainname(struct ucred *cred, char *buf, size_t size)
4172 {
4173
4174 mtx_lock(&cred->cr_prison->pr_mtx);
4175 strlcpy(buf, cred->cr_prison->pr_domainname, size);
4176 mtx_unlock(&cred->cr_prison->pr_mtx);
4177 }
4178
4179 void
getcredhostuuid(struct ucred * cred,char * buf,size_t size)4180 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
4181 {
4182
4183 mtx_lock(&cred->cr_prison->pr_mtx);
4184 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
4185 mtx_unlock(&cred->cr_prison->pr_mtx);
4186 }
4187
4188 void
getcredhostid(struct ucred * cred,unsigned long * hostid)4189 getcredhostid(struct ucred *cred, unsigned long *hostid)
4190 {
4191
4192 mtx_lock(&cred->cr_prison->pr_mtx);
4193 *hostid = cred->cr_prison->pr_hostid;
4194 mtx_unlock(&cred->cr_prison->pr_mtx);
4195 }
4196
4197 void
getjailname(struct ucred * cred,char * name,size_t len)4198 getjailname(struct ucred *cred, char *name, size_t len)
4199 {
4200
4201 mtx_lock(&cred->cr_prison->pr_mtx);
4202 strlcpy(name, cred->cr_prison->pr_name, len);
4203 mtx_unlock(&cred->cr_prison->pr_mtx);
4204 }
4205
4206 #ifdef VIMAGE
4207 /*
4208 * Determine whether the prison owns its VNET.
4209 */
4210 bool
prison_owns_vnet(struct prison * pr)4211 prison_owns_vnet(struct prison *pr)
4212 {
4213
4214 /*
4215 * vnets cannot be added/removed after jail creation,
4216 * so no need to lock here.
4217 */
4218 return ((pr->pr_flags & PR_VNET) != 0);
4219 }
4220 #endif
4221
4222 /*
4223 * Determine whether the subject represented by cred can "see"
4224 * status of a mount point.
4225 * Returns: 0 for permitted, ENOENT otherwise.
4226 * XXX: This function should be called cr_canseemount() and should be
4227 * placed in kern_prot.c.
4228 */
4229 int
prison_canseemount(struct ucred * cred,struct mount * mp)4230 prison_canseemount(struct ucred *cred, struct mount *mp)
4231 {
4232 struct prison *pr;
4233 struct statfs *sp;
4234 size_t len;
4235
4236 pr = cred->cr_prison;
4237 if (pr->pr_enforce_statfs == 0)
4238 return (0);
4239 if (pr->pr_root->v_mount == mp)
4240 return (0);
4241 if (pr->pr_enforce_statfs == 2)
4242 return (ENOENT);
4243 /*
4244 * If jail's chroot directory is set to "/" we should be able to see
4245 * all mount-points from inside a jail.
4246 * This is ugly check, but this is the only situation when jail's
4247 * directory ends with '/'.
4248 */
4249 if (strcmp(pr->pr_path, "/") == 0)
4250 return (0);
4251 len = strlen(pr->pr_path);
4252 sp = &mp->mnt_stat;
4253 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
4254 return (ENOENT);
4255 /*
4256 * Be sure that we don't have situation where jail's root directory
4257 * is "/some/path" and mount point is "/some/pathpath".
4258 */
4259 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
4260 return (ENOENT);
4261 return (0);
4262 }
4263
4264 void
prison_enforce_statfs(struct ucred * cred,struct mount * mp,struct statfs * sp)4265 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
4266 {
4267 char jpath[MAXPATHLEN];
4268 struct prison *pr;
4269 size_t len;
4270
4271 pr = cred->cr_prison;
4272 if (pr->pr_enforce_statfs == 0)
4273 return;
4274 if (prison_canseemount(cred, mp) != 0) {
4275 bzero(&sp->f_fsid, sizeof(sp->f_fsid));
4276 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
4277 strlcpy(sp->f_mntonname, "[restricted]",
4278 sizeof(sp->f_mntonname));
4279 return;
4280 }
4281 if (pr->pr_enforce_statfs > 1)
4282 bzero(&sp->f_fsid, sizeof(sp->f_fsid));
4283 if (pr->pr_root->v_mount == mp) {
4284 /*
4285 * Clear current buffer data, so we are sure nothing from
4286 * the valid path left there.
4287 */
4288 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
4289 *sp->f_mntonname = '/';
4290 return;
4291 }
4292 /*
4293 * If jail's chroot directory is set to "/" we should be able to see
4294 * all mount-points from inside a jail.
4295 */
4296 if (strcmp(pr->pr_path, "/") == 0)
4297 return;
4298 len = strlen(pr->pr_path);
4299 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
4300 /*
4301 * Clear current buffer data, so we are sure nothing from
4302 * the valid path left there.
4303 */
4304 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
4305 if (*jpath == '\0') {
4306 /* Should never happen. */
4307 *sp->f_mntonname = '/';
4308 } else {
4309 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
4310 }
4311 }
4312
4313 /*
4314 * Check with permission for a specific privilege is granted within jail. We
4315 * have a specific list of accepted privileges; the rest are denied.
4316 */
4317 int
prison_priv_check(struct ucred * cred,int priv)4318 prison_priv_check(struct ucred *cred, int priv)
4319 {
4320 struct prison *pr;
4321 int error;
4322
4323 /*
4324 * Some policies have custom handlers. This routine should not be
4325 * called for them. See priv_check_cred().
4326 */
4327 switch (priv) {
4328 case PRIV_VFS_LOOKUP:
4329 case PRIV_VFS_GENERATION:
4330 KASSERT(0, ("prison_priv_check instead of a custom handler "
4331 "called for %d\n", priv));
4332 }
4333
4334 if (!jailed(cred))
4335 return (0);
4336
4337 #ifdef VIMAGE
4338 /*
4339 * Privileges specific to prisons with a virtual network stack.
4340 * There might be a duplicate entry here in case the privilege
4341 * is only granted conditionally in the legacy jail case.
4342 */
4343 switch (priv) {
4344 /*
4345 * NFS-specific privileges.
4346 */
4347 case PRIV_NFS_DAEMON:
4348 case PRIV_VFS_GETFH:
4349 case PRIV_VFS_MOUNT_EXPORTED:
4350 if (!prison_check_nfsd(cred))
4351 return (EPERM);
4352 #ifdef notyet
4353 case PRIV_NFS_LOCKD:
4354 #endif
4355 /*
4356 * Network stack privileges.
4357 */
4358 case PRIV_NET_BRIDGE:
4359 case PRIV_NET_GRE:
4360 case PRIV_NET_BPF:
4361 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
4362 case PRIV_NET_ROUTE:
4363 case PRIV_NET_TAP:
4364 case PRIV_NET_SETIFMTU:
4365 case PRIV_NET_SETIFFLAGS:
4366 case PRIV_NET_SETIFCAP:
4367 case PRIV_NET_SETIFDESCR:
4368 case PRIV_NET_SETIFNAME :
4369 case PRIV_NET_SETIFMETRIC:
4370 case PRIV_NET_SETIFPHYS:
4371 case PRIV_NET_SETIFMAC:
4372 case PRIV_NET_SETLANPCP:
4373 case PRIV_NET_ADDMULTI:
4374 case PRIV_NET_DELMULTI:
4375 case PRIV_NET_HWIOCTL:
4376 case PRIV_NET_SETLLADDR:
4377 case PRIV_NET_ADDIFGROUP:
4378 case PRIV_NET_DELIFGROUP:
4379 case PRIV_NET_IFCREATE:
4380 case PRIV_NET_IFDESTROY:
4381 case PRIV_NET_ADDIFADDR:
4382 case PRIV_NET_DELIFADDR:
4383 case PRIV_NET_LAGG:
4384 case PRIV_NET_GIF:
4385 case PRIV_NET_SETIFVNET:
4386 case PRIV_NET_SETIFFIB:
4387 case PRIV_NET_OVPN:
4388 case PRIV_NET_ME:
4389 case PRIV_NET_WG:
4390
4391 /*
4392 * 802.11-related privileges.
4393 */
4394 case PRIV_NET80211_VAP_GETKEY:
4395 case PRIV_NET80211_VAP_MANAGE:
4396
4397 #ifdef notyet
4398 /*
4399 * ATM privileges.
4400 */
4401 case PRIV_NETATM_CFG:
4402 case PRIV_NETATM_ADD:
4403 case PRIV_NETATM_DEL:
4404 case PRIV_NETATM_SET:
4405
4406 /*
4407 * Bluetooth privileges.
4408 */
4409 case PRIV_NETBLUETOOTH_RAW:
4410 #endif
4411
4412 /*
4413 * Netgraph and netgraph module privileges.
4414 */
4415 case PRIV_NETGRAPH_CONTROL:
4416 #ifdef notyet
4417 case PRIV_NETGRAPH_TTY:
4418 #endif
4419
4420 /*
4421 * IPv4 and IPv6 privileges.
4422 */
4423 case PRIV_NETINET_IPFW:
4424 case PRIV_NETINET_DIVERT:
4425 case PRIV_NETINET_PF:
4426 case PRIV_NETINET_DUMMYNET:
4427 case PRIV_NETINET_CARP:
4428 case PRIV_NETINET_MROUTE:
4429 case PRIV_NETINET_RAW:
4430 case PRIV_NETINET_ADDRCTRL6:
4431 case PRIV_NETINET_ND6:
4432 case PRIV_NETINET_SCOPE6:
4433 case PRIV_NETINET_ALIFETIME6:
4434 case PRIV_NETINET_IPSEC:
4435 case PRIV_NETINET_BINDANY:
4436
4437 #ifdef notyet
4438 /*
4439 * NCP privileges.
4440 */
4441 case PRIV_NETNCP:
4442
4443 /*
4444 * SMB privileges.
4445 */
4446 case PRIV_NETSMB:
4447 #endif
4448
4449 /*
4450 * No default: or deny here.
4451 * In case of no permit fall through to next switch().
4452 */
4453 if (cred->cr_prison->pr_flags & PR_VNET)
4454 return (0);
4455 }
4456 #endif /* VIMAGE */
4457
4458 switch (priv) {
4459 /*
4460 * Allow ktrace privileges for root in jail.
4461 */
4462 case PRIV_KTRACE:
4463
4464 /*
4465 * Allow jailed processes to configure audit identity and
4466 * submit audit records (login, etc). In the future we may
4467 * want to further refine the relationship between audit and
4468 * jail.
4469 */
4470 case PRIV_AUDIT_GETAUDIT:
4471 case PRIV_AUDIT_SETAUDIT:
4472 if (cred->cr_prison->pr_allow & PR_ALLOW_SETAUDIT)
4473 return (0);
4474 else
4475 return (EPERM);
4476 #if 0
4477 case PRIV_AUDIT_SUBMIT:
4478 #endif
4479
4480 /*
4481 * Allow jailed processes to manipulate process UNIX
4482 * credentials in any way they see fit.
4483 */
4484 case PRIV_CRED_SETCRED:
4485 case PRIV_CRED_SETUID:
4486 case PRIV_CRED_SETEUID:
4487 case PRIV_CRED_SETGID:
4488 case PRIV_CRED_SETEGID:
4489 case PRIV_CRED_SETGROUPS:
4490 case PRIV_CRED_SETREUID:
4491 case PRIV_CRED_SETREGID:
4492 case PRIV_CRED_SETRESUID:
4493 case PRIV_CRED_SETRESGID:
4494
4495 /*
4496 * Jail implements visibility constraints already, so allow
4497 * jailed root to override uid/gid-based constraints.
4498 */
4499 case PRIV_SEEOTHERGIDS:
4500 case PRIV_SEEOTHERUIDS:
4501 case PRIV_SEEJAILPROC:
4502
4503 /*
4504 * Jail implements inter-process debugging limits already, so
4505 * allow jailed root various debugging privileges.
4506 */
4507 case PRIV_DEBUG_DIFFCRED:
4508 case PRIV_DEBUG_SUGID:
4509 case PRIV_DEBUG_UNPRIV:
4510 case PRIV_DEBUG_DIFFJAIL:
4511
4512 /*
4513 * Allow jail to set various resource limits and login
4514 * properties, and for now, exceed process resource limits.
4515 */
4516 case PRIV_PROC_LIMIT:
4517 case PRIV_PROC_SETLOGIN:
4518 case PRIV_PROC_SETRLIMIT:
4519
4520 /*
4521 * Debuggers should work in jails.
4522 */
4523 case PRIV_PROC_MEM_WRITE:
4524
4525 /*
4526 * System V and POSIX IPC privileges are granted in jail.
4527 */
4528 case PRIV_IPC_READ:
4529 case PRIV_IPC_WRITE:
4530 case PRIV_IPC_ADMIN:
4531 case PRIV_IPC_MSGSIZE:
4532 case PRIV_MQ_ADMIN:
4533
4534 /*
4535 * Jail operations within a jail work on child jails.
4536 */
4537 case PRIV_JAIL_ATTACH:
4538 case PRIV_JAIL_SET:
4539 case PRIV_JAIL_REMOVE:
4540
4541 /*
4542 * Jail implements its own inter-process limits, so allow
4543 * root processes in jail to change scheduling on other
4544 * processes in the same jail. Likewise for signalling.
4545 */
4546 case PRIV_SCHED_DIFFCRED:
4547 case PRIV_SCHED_CPUSET:
4548 case PRIV_SCHED_DIFFJAIL:
4549 case PRIV_SIGNAL_DIFFCRED:
4550 case PRIV_SIGNAL_SUGID:
4551 case PRIV_SIGNAL_DIFFJAIL:
4552
4553 /*
4554 * Allow jailed processes to write to sysctls marked as jail
4555 * writable.
4556 */
4557 case PRIV_SYSCTL_WRITEJAIL:
4558
4559 /*
4560 * Allow root in jail to manage a variety of quota
4561 * properties. These should likely be conditional on a
4562 * configuration option.
4563 */
4564 case PRIV_VFS_GETQUOTA:
4565 case PRIV_VFS_SETQUOTA:
4566
4567 /*
4568 * Since Jail relies on chroot() to implement file system
4569 * protections, grant many VFS privileges to root in jail.
4570 * Be careful to exclude mount-related and NFS-related
4571 * privileges.
4572 */
4573 case PRIV_VFS_READ:
4574 case PRIV_VFS_WRITE:
4575 case PRIV_VFS_ADMIN:
4576 case PRIV_VFS_EXEC:
4577 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
4578 case PRIV_VFS_CHFLAGS_DEV:
4579 case PRIV_VFS_CHOWN:
4580 case PRIV_VFS_CHROOT:
4581 case PRIV_VFS_RETAINSUGID:
4582 case PRIV_VFS_FCHROOT:
4583 case PRIV_VFS_LINK:
4584 case PRIV_VFS_SETGID:
4585 case PRIV_VFS_STAT:
4586 case PRIV_VFS_STICKYFILE:
4587
4588 /*
4589 * As in the non-jail case, non-root users are expected to be
4590 * able to read kernel/physical memory (provided /dev/[k]mem
4591 * exists in the jail and they have permission to access it).
4592 */
4593 case PRIV_KMEM_READ:
4594 return (0);
4595
4596 /*
4597 * Depending on the global setting, allow privilege of
4598 * setting system flags.
4599 */
4600 case PRIV_VFS_SYSFLAGS:
4601 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
4602 return (0);
4603 else
4604 return (EPERM);
4605
4606 /*
4607 * Depending on the global setting, allow privilege of
4608 * mounting/unmounting file systems.
4609 */
4610 case PRIV_VFS_MOUNT:
4611 case PRIV_VFS_UNMOUNT:
4612 case PRIV_VFS_MOUNT_NONUSER:
4613 case PRIV_VFS_MOUNT_OWNER:
4614 pr = cred->cr_prison;
4615 prison_lock(pr);
4616 if (pr->pr_allow & PR_ALLOW_MOUNT && pr->pr_enforce_statfs < 2)
4617 error = 0;
4618 else
4619 error = EPERM;
4620 prison_unlock(pr);
4621 return (error);
4622
4623 /*
4624 * Jails should hold no disposition on the PRIV_VFS_READ_DIR
4625 * policy. priv_check_cred will not specifically allow it, and
4626 * we may want a MAC policy to allow it.
4627 */
4628 case PRIV_VFS_READ_DIR:
4629 return (0);
4630
4631 /*
4632 * Conditionally allow privileged process in the jail to
4633 * manipulate filesystem extended attributes in the system
4634 * namespace.
4635 */
4636 case PRIV_VFS_EXTATTR_SYSTEM:
4637 if ((cred->cr_prison->pr_allow & PR_ALLOW_EXTATTR) != 0)
4638 return (0);
4639 else
4640 return (EPERM);
4641
4642 /*
4643 * Conditionnaly allow locking (unlocking) physical pages
4644 * in memory.
4645 */
4646 case PRIV_VM_MLOCK:
4647 case PRIV_VM_MUNLOCK:
4648 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK)
4649 return (0);
4650 else
4651 return (EPERM);
4652
4653 /*
4654 * Conditionally allow jailed root to bind reserved ports.
4655 */
4656 case PRIV_NETINET_RESERVEDPORT:
4657 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS)
4658 return (0);
4659 else
4660 return (EPERM);
4661
4662 /*
4663 * Allow jailed root to reuse in-use ports.
4664 */
4665 case PRIV_NETINET_REUSEPORT:
4666 return (0);
4667
4668 /*
4669 * Allow jailed root to set certain IPv4/6 (option) headers.
4670 */
4671 case PRIV_NETINET_SETHDROPTS:
4672 return (0);
4673
4674 /*
4675 * Conditionally allow creating raw sockets in jail.
4676 */
4677 case PRIV_NETINET_RAW:
4678 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
4679 return (0);
4680 else
4681 return (EPERM);
4682
4683 /*
4684 * Since jail implements its own visibility limits on netstat
4685 * sysctls, allow getcred. This allows identd to work in
4686 * jail.
4687 */
4688 case PRIV_NETINET_GETCRED:
4689 return (0);
4690
4691 /*
4692 * Allow jailed root to set loginclass.
4693 */
4694 case PRIV_PROC_SETLOGINCLASS:
4695 return (0);
4696
4697 /*
4698 * Do not allow a process inside a jail to read the kernel
4699 * message buffer unless explicitly permitted.
4700 */
4701 case PRIV_MSGBUF:
4702 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF)
4703 return (0);
4704 return (EPERM);
4705
4706 /*
4707 * Conditionally allow privileged process in the jail adjust
4708 * machine time.
4709 */
4710 case PRIV_ADJTIME:
4711 case PRIV_NTP_ADJTIME:
4712 if (cred->cr_prison->pr_allow &
4713 (PR_ALLOW_ADJTIME | PR_ALLOW_SETTIME)) {
4714 return (0);
4715 }
4716 return (EPERM);
4717
4718 /*
4719 * Conditionally allow privileged process in the jail set
4720 * machine time.
4721 */
4722 case PRIV_SETTIMEOFDAY:
4723 case PRIV_CLOCK_SETTIME:
4724 if (cred->cr_prison->pr_allow & PR_ALLOW_SETTIME)
4725 return (0);
4726 else
4727 return (EPERM);
4728
4729 /*
4730 * Conditionally allow privileged process in the jail to modify
4731 * the routing table.
4732 */
4733 case PRIV_NET_ROUTE:
4734 if (cred->cr_prison->pr_allow & PR_ALLOW_ROUTING)
4735 return (0);
4736 else
4737 return (EPERM);
4738
4739 case PRIV_VMM_PPTDEV:
4740 /*
4741 * Allow jailed root to manage passthrough devices. vmm(4) also
4742 * checks for the dynamically added allow.vmm_ppt.
4743 */
4744 return (0);
4745
4746 default:
4747 /*
4748 * In all remaining cases, deny the privilege request. This
4749 * includes almost all network privileges, many system
4750 * configuration privileges.
4751 */
4752 return (EPERM);
4753 }
4754 }
4755
4756 /*
4757 * Return the part of pr2's name that is relative to pr1, or the whole name
4758 * if it does not directly follow.
4759 */
4760
4761 char *
prison_name(struct prison * pr1,struct prison * pr2)4762 prison_name(struct prison *pr1, struct prison *pr2)
4763 {
4764 char *name;
4765
4766 /* Jails see themselves as "0" (if they see themselves at all). */
4767 if (pr1 == pr2)
4768 return "0";
4769 name = pr2->pr_name;
4770 if (prison_ischild(pr1, pr2)) {
4771 /*
4772 * pr1 isn't locked (and allprison_lock may not be either)
4773 * so its length can't be counted on. But the number of dots
4774 * can be counted on - and counted.
4775 */
4776 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
4777 name = strchr(name, '.') + 1;
4778 }
4779 return (name);
4780 }
4781
4782 /*
4783 * Return the part of pr2's path that is relative to pr1, or the whole path
4784 * if it does not directly follow.
4785 */
4786 static char *
prison_path(struct prison * pr1,struct prison * pr2)4787 prison_path(struct prison *pr1, struct prison *pr2)
4788 {
4789 char *path1, *path2;
4790 int len1;
4791
4792 path1 = pr1->pr_path;
4793 path2 = pr2->pr_path;
4794 if (!strcmp(path1, "/"))
4795 return (path2);
4796 len1 = strlen(path1);
4797 if (strncmp(path1, path2, len1))
4798 return (path2);
4799 if (path2[len1] == '\0')
4800 return "/";
4801 if (path2[len1] == '/')
4802 return (path2 + len1);
4803 return (path2);
4804 }
4805
4806 /*
4807 * Jail-related sysctls.
4808 */
4809 SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
4810 "Jails");
4811
4812 #if defined(INET) || defined(INET6)
4813 /*
4814 * Copy address array to memory that would be then SYSCTL_OUT-ed.
4815 * sysctl_jail_list() helper.
4816 */
4817 static void
prison_ip_copyout(struct prison * pr,const pr_family_t af,void ** out,int * len)4818 prison_ip_copyout(struct prison *pr, const pr_family_t af, void **out, int *len)
4819 {
4820 const struct prison_ip *pip;
4821 const size_t size = pr_families[af].size;
4822
4823 again:
4824 mtx_assert(&pr->pr_mtx, MA_OWNED);
4825 if ((pip = pr->pr_addrs[af]) != NULL) {
4826 if (*len < pip->ips) {
4827 *len = pip->ips;
4828 mtx_unlock(&pr->pr_mtx);
4829 *out = realloc(*out, *len * size, M_TEMP, M_WAITOK);
4830 mtx_lock(&pr->pr_mtx);
4831 goto again;
4832 }
4833 bcopy(pip->pr_ip, *out, pip->ips * size);
4834 }
4835 }
4836 #endif
4837
4838 static int
sysctl_jail_list(SYSCTL_HANDLER_ARGS)4839 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
4840 {
4841 struct xprison *xp;
4842 struct prison *pr, *cpr;
4843 #ifdef INET
4844 struct in_addr *ip4 = NULL;
4845 int ip4s = 0;
4846 #endif
4847 #ifdef INET6
4848 struct in6_addr *ip6 = NULL;
4849 int ip6s = 0;
4850 #endif
4851 int descend, error;
4852
4853 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
4854 pr = req->td->td_ucred->cr_prison;
4855 error = 0;
4856 sx_slock(&allprison_lock);
4857 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
4858 mtx_lock(&cpr->pr_mtx);
4859 #ifdef INET
4860 prison_ip_copyout(cpr, PR_INET, (void **)&ip4, &ip4s);
4861 #endif
4862 #ifdef INET6
4863 prison_ip_copyout(cpr, PR_INET6, (void **)&ip6, &ip6s);
4864 #endif
4865 bzero(xp, sizeof(*xp));
4866 xp->pr_version = XPRISON_VERSION;
4867 xp->pr_id = cpr->pr_id;
4868 xp->pr_state = cpr->pr_state;
4869 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
4870 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
4871 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
4872 #ifdef INET
4873 xp->pr_ip4s = ip4s;
4874 #endif
4875 #ifdef INET6
4876 xp->pr_ip6s = ip6s;
4877 #endif
4878 mtx_unlock(&cpr->pr_mtx);
4879 error = SYSCTL_OUT(req, xp, sizeof(*xp));
4880 if (error)
4881 break;
4882 #ifdef INET
4883 if (xp->pr_ip4s > 0) {
4884 error = SYSCTL_OUT(req, ip4,
4885 xp->pr_ip4s * sizeof(struct in_addr));
4886 if (error)
4887 break;
4888 }
4889 #endif
4890 #ifdef INET6
4891 if (xp->pr_ip6s > 0) {
4892 error = SYSCTL_OUT(req, ip6,
4893 xp->pr_ip6s * sizeof(struct in6_addr));
4894 if (error)
4895 break;
4896 }
4897 #endif
4898 }
4899 sx_sunlock(&allprison_lock);
4900 free(xp, M_TEMP);
4901 #ifdef INET
4902 free(ip4, M_TEMP);
4903 #endif
4904 #ifdef INET6
4905 free(ip6, M_TEMP);
4906 #endif
4907 return (error);
4908 }
4909
4910 SYSCTL_OID(_security_jail, OID_AUTO, list,
4911 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4912 sysctl_jail_list, "S", "List of active jails");
4913
4914 static int
sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)4915 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
4916 {
4917 int error, injail;
4918
4919 injail = jailed(req->td->td_ucred);
4920 error = SYSCTL_OUT(req, &injail, sizeof(injail));
4921
4922 return (error);
4923 }
4924
4925 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
4926 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4927 sysctl_jail_jailed, "I", "Process in jail?");
4928
4929 static int
sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)4930 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
4931 {
4932 int error, havevnet;
4933 #ifdef VIMAGE
4934 struct ucred *cred = req->td->td_ucred;
4935
4936 havevnet = jailed(cred) && prison_owns_vnet(cred->cr_prison);
4937 #else
4938 havevnet = 0;
4939 #endif
4940 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
4941
4942 return (error);
4943 }
4944
4945 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
4946 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4947 sysctl_jail_vnet, "I", "Jail owns vnet?");
4948
4949 #if defined(INET) || defined(INET6)
4950 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
4951 &jail_max_af_ips, 0,
4952 "Number of IP addresses a jail may have at most per address family (deprecated)");
4953 #endif
4954
4955 /*
4956 * Default parameters for jail(2) compatibility. For historical reasons,
4957 * the sysctl names have varying similarity to the parameter names. Prisons
4958 * just see their own parameters, and can't change them.
4959 */
4960 static int
sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)4961 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
4962 {
4963 int error, i;
4964
4965 /* Get the current flag value, and convert it to a boolean. */
4966 if (req->td->td_ucred->cr_prison == &prison0) {
4967 mtx_lock(&prison0.pr_mtx);
4968 i = (jail_default_allow & arg2) != 0;
4969 mtx_unlock(&prison0.pr_mtx);
4970 } else
4971 i = prison_allow(req->td->td_ucred, arg2);
4972
4973 if (arg1 != NULL)
4974 i = !i;
4975 error = sysctl_handle_int(oidp, &i, 0, req);
4976 if (error || !req->newptr)
4977 return (error);
4978 i = i ? arg2 : 0;
4979 if (arg1 != NULL)
4980 i ^= arg2;
4981 /*
4982 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
4983 * for writing.
4984 */
4985 mtx_lock(&prison0.pr_mtx);
4986 jail_default_allow = (jail_default_allow & ~arg2) | i;
4987 mtx_unlock(&prison0.pr_mtx);
4988 return (0);
4989 }
4990
4991 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
4992 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4993 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
4994 "Processes in jail can set their hostnames (deprecated)");
4995 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
4996 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4997 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
4998 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)");
4999 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
5000 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
5001 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
5002 "Processes in jail can use System V IPC primitives (deprecated)");
5003 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
5004 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
5005 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
5006 "Prison root can create raw sockets (deprecated)");
5007 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
5008 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
5009 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
5010 "Processes in jail can alter system file flags (deprecated)");
5011 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
5012 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
5013 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
5014 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)");
5015 SYSCTL_PROC(_security_jail, OID_AUTO, mlock_allowed,
5016 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
5017 NULL, PR_ALLOW_MLOCK, sysctl_jail_default_allow, "I",
5018 "Processes in jail can lock/unlock physical pages in memory");
5019
5020 static int
sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)5021 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
5022 {
5023 struct prison *pr;
5024 int level, error;
5025
5026 pr = req->td->td_ucred->cr_prison;
5027 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
5028 error = sysctl_handle_int(oidp, &level, 0, req);
5029 if (error || !req->newptr)
5030 return (error);
5031 *(int *)arg1 = level;
5032 return (0);
5033 }
5034
5035 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
5036 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
5037 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
5038 sysctl_jail_default_level, "I",
5039 "Processes in jail cannot see all mounted file systems (deprecated)");
5040
5041 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
5042 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
5043 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
5044 sysctl_jail_default_level, "I",
5045 "Ruleset for the devfs filesystem in jail (deprecated)");
5046
5047 SYSCTL_NODE(_security_jail, OID_AUTO, children, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
5048 "Limits and stats of child jails");
5049
5050 static int
sysctl_jail_children(SYSCTL_HANDLER_ARGS)5051 sysctl_jail_children(SYSCTL_HANDLER_ARGS)
5052 {
5053 struct prison *pr;
5054 int i;
5055
5056 pr = req->td->td_ucred->cr_prison;
5057
5058 switch (oidp->oid_kind & CTLTYPE) {
5059 case CTLTYPE_INT:
5060 i = *(int *)((char *)pr + arg2);
5061 return (SYSCTL_OUT(req, &i, sizeof(i)));
5062 }
5063
5064 return (0);
5065 }
5066
5067 SYSCTL_PROC(_security_jail_children, OID_AUTO, max,
5068 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
5069 NULL, offsetof(struct prison, pr_childmax), sysctl_jail_children,
5070 "I", "Maximum number of child jails");
5071 SYSCTL_PROC(_security_jail_children, OID_AUTO, cur,
5072 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
5073 NULL, offsetof(struct prison, pr_childcount), sysctl_jail_children,
5074 "I", "Current number of child jails");
5075
5076 /*
5077 * Nodes to describe jail parameters. Maximum length of string parameters
5078 * is returned in the string itself, and the other parameters exist merely
5079 * to make themselves and their types known.
5080 */
5081 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
5082 "Jail parameters");
5083
5084 int
sysctl_jail_param(SYSCTL_HANDLER_ARGS)5085 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
5086 {
5087 int i;
5088 long l;
5089 size_t s;
5090 char numbuf[12];
5091
5092 switch (oidp->oid_kind & CTLTYPE)
5093 {
5094 case CTLTYPE_LONG:
5095 case CTLTYPE_ULONG:
5096 l = 0;
5097 #ifdef SCTL_MASK32
5098 if (!(req->flags & SCTL_MASK32))
5099 #endif
5100 return (SYSCTL_OUT(req, &l, sizeof(l)));
5101 case CTLTYPE_INT:
5102 case CTLTYPE_UINT:
5103 i = 0;
5104 return (SYSCTL_OUT(req, &i, sizeof(i)));
5105 case CTLTYPE_STRING:
5106 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
5107 return
5108 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
5109 case CTLTYPE_STRUCT:
5110 s = (size_t)arg2;
5111 return (SYSCTL_OUT(req, &s, sizeof(s)));
5112 }
5113 return (0);
5114 }
5115
5116 /*
5117 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at
5118 * jail creation time but cannot be changed in an existing jail.
5119 */
5120 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
5121 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
5122 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
5123 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
5124 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
5125 "I", "Jail secure level");
5126 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I",
5127 "Jail value for kern.osreldate and uname -K");
5128 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN,
5129 "Jail value for kern.osrelease and uname -r");
5130 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
5131 "I", "Jail cannot see all mounted file systems");
5132 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
5133 "I", "Ruleset for in-jail devfs mounts");
5134 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
5135 "B", "Jail persistence");
5136 #ifdef VIMAGE
5137 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
5138 "E,jailsys", "Virtual network stack");
5139 #endif
5140 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
5141 "B", "Jail is in the process of shutting down");
5142
5143 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
5144 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
5145 "I", "Current number of child jails");
5146 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
5147 "I", "Maximum number of child jails");
5148
5149 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
5150 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
5151 "Jail hostname");
5152 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
5153 "Jail NIS domainname");
5154 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
5155 "Jail host UUID");
5156 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
5157 "LU", "Jail host ID");
5158
5159 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
5160 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
5161
5162 #ifdef MAC
5163 SYSCTL_JAIL_PARAM_STRUCT(_mac, label, CTLFLAG_RW, sizeof(struct mac),
5164 "S,mac", "Jail MAC label");
5165 #endif
5166
5167 #ifdef INET
5168 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
5169 "Jail IPv4 address virtualization");
5170 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
5171 "S,in_addr,a", "Jail IPv4 addresses");
5172 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
5173 "B", "Do (not) use IPv4 source address selection rather than the "
5174 "primary jail IPv4 address.");
5175 #endif
5176 #ifdef INET6
5177 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
5178 "Jail IPv6 address virtualization");
5179 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
5180 "S,in6_addr,a", "Jail IPv6 addresses");
5181 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
5182 "B", "Do (not) use IPv6 source address selection rather than the "
5183 "primary jail IPv6 address.");
5184 #endif
5185
5186 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
5187 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
5188 "B", "Jail may set hostname");
5189 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
5190 "B", "Jail may use SYSV IPC");
5191 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
5192 "B", "Jail may create raw sockets");
5193 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
5194 "B", "Jail may alter system file flags");
5195 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
5196 "B", "Jail may set file quotas");
5197 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
5198 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
5199 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW,
5200 "B", "Jail may lock (unlock) physical pages in memory");
5201 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW,
5202 "B", "Jail may bind sockets to reserved ports");
5203 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW,
5204 "B", "Jail may read the kernel message buffer");
5205 SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW,
5206 "B", "Unprivileged processes may use process debugging facilities");
5207 SYSCTL_JAIL_PARAM(_allow, unprivileged_parent_tampering,
5208 CTLTYPE_INT | CTLFLAG_RW, "B",
5209 "Unprivileged parent jail processes may tamper with same-uid processes"
5210 " (signal/debug/cpuset)");
5211 SYSCTL_JAIL_PARAM(_allow, suser, CTLTYPE_INT | CTLFLAG_RW,
5212 "B", "Processes in jail with uid 0 have privilege");
5213 #ifdef VIMAGE
5214 SYSCTL_JAIL_PARAM(_allow, nfsd, CTLTYPE_INT | CTLFLAG_RW,
5215 "B", "Mountd/nfsd may run in the jail");
5216 #endif
5217 SYSCTL_JAIL_PARAM(_allow, extattr, CTLTYPE_INT | CTLFLAG_RW,
5218 "B", "Jail may set system-level filesystem extended attributes");
5219 SYSCTL_JAIL_PARAM(_allow, adjtime, CTLTYPE_INT | CTLFLAG_RW,
5220 "B", "Jail may adjust system time");
5221 SYSCTL_JAIL_PARAM(_allow, settime, CTLTYPE_INT | CTLFLAG_RW,
5222 "B", "Jail may set system time");
5223 SYSCTL_JAIL_PARAM(_allow, routing, CTLTYPE_INT | CTLFLAG_RW,
5224 "B", "Jail may modify routing table");
5225 #ifdef AUDIT
5226 SYSCTL_JAIL_PARAM(_allow, setaudit, CTLTYPE_INT | CTLFLAG_RW,
5227 "B", "Jail may set and get audit session state");
5228 #endif
5229
5230 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
5231 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
5232 "B", "Jail may mount/unmount jail-friendly file systems in general");
5233
5234 /*
5235 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return
5236 * its associated bit in the pr_allow bitmask, or zero if the parameter was
5237 * not created.
5238 */
5239 unsigned
prison_add_allow(const char * prefix,const char * name,const char * prefix_descr,const char * descr)5240 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr,
5241 const char *descr)
5242 {
5243 struct bool_flags *bf;
5244 struct sysctl_oid *parent;
5245 char *allow_name, *allow_noname, *allowed;
5246 #ifndef NO_SYSCTL_DESCR
5247 char *descr_deprecated;
5248 #endif
5249 u_int allow_flag;
5250
5251 if (prefix
5252 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name)
5253 < 0 ||
5254 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name)
5255 < 0
5256 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 ||
5257 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) {
5258 free(allow_name, M_PRISON);
5259 return 0;
5260 }
5261
5262 /*
5263 * See if this parameter has already beed added, i.e. a module was
5264 * previously loaded/unloaded.
5265 */
5266 mtx_lock(&prison0.pr_mtx);
5267 for (bf = pr_flag_allow;
5268 bf < pr_flag_allow + nitems(pr_flag_allow) &&
5269 atomic_load_int(&bf->flag) != 0;
5270 bf++) {
5271 if (strcmp(bf->name, allow_name) == 0) {
5272 allow_flag = bf->flag;
5273 goto no_add;
5274 }
5275 }
5276
5277 /*
5278 * Find a free bit in pr_allow_all, failing if there are none
5279 * (which shouldn't happen as long as we keep track of how many
5280 * potential dynamic flags exist).
5281 */
5282 for (allow_flag = 1;; allow_flag <<= 1) {
5283 if (allow_flag == 0)
5284 goto no_add;
5285 if ((pr_allow_all & allow_flag) == 0)
5286 break;
5287 }
5288
5289 /* Note the parameter in the next open slot in pr_flag_allow. */
5290 for (bf = pr_flag_allow; ; bf++) {
5291 if (bf == pr_flag_allow + nitems(pr_flag_allow)) {
5292 /* This should never happen, but is not fatal. */
5293 allow_flag = 0;
5294 goto no_add;
5295 }
5296 if (atomic_load_int(&bf->flag) == 0)
5297 break;
5298 }
5299 bf->name = allow_name;
5300 bf->noname = allow_noname;
5301 pr_allow_all |= allow_flag;
5302 /*
5303 * prison0 always has permission for the new parameter.
5304 * Other jails must have it granted to them.
5305 */
5306 prison0.pr_allow |= allow_flag;
5307 /* The flag indicates a valid entry, so make sure it is set last. */
5308 atomic_store_rel_int(&bf->flag, allow_flag);
5309 mtx_unlock(&prison0.pr_mtx);
5310
5311 /*
5312 * Create sysctls for the parameter, and the back-compat global
5313 * permission.
5314 */
5315 parent = prefix
5316 ? SYSCTL_ADD_NODE(NULL,
5317 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow),
5318 OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr)
5319 : &sysctl___security_jail_param_allow;
5320 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO,
5321 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
5322 NULL, 0, sysctl_jail_param, "B", descr);
5323 if ((prefix
5324 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name)
5325 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) {
5326 #ifndef NO_SYSCTL_DESCR
5327 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)",
5328 descr);
5329 #endif
5330 (void)SYSCTL_ADD_PROC(NULL,
5331 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed,
5332 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag,
5333 sysctl_jail_default_allow, "I", descr_deprecated);
5334 #ifndef NO_SYSCTL_DESCR
5335 free(descr_deprecated, M_TEMP);
5336 #endif
5337 free(allowed, M_TEMP);
5338 }
5339 return allow_flag;
5340
5341 no_add:
5342 mtx_unlock(&prison0.pr_mtx);
5343 free(allow_name, M_PRISON);
5344 free(allow_noname, M_PRISON);
5345 return allow_flag;
5346 }
5347
5348 /*
5349 * The VFS system will register jail-aware filesystems here. They each get
5350 * a parameter allow.mount.xxxfs and a flag to check when a jailed user
5351 * attempts to mount.
5352 */
5353 void
prison_add_vfs(struct vfsconf * vfsp)5354 prison_add_vfs(struct vfsconf *vfsp)
5355 {
5356 #ifdef NO_SYSCTL_DESCR
5357
5358 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
5359 NULL, NULL);
5360 #else
5361 char *descr;
5362
5363 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system",
5364 vfsp->vfc_name);
5365 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
5366 NULL, descr);
5367 free(descr, M_TEMP);
5368 #endif
5369 }
5370
5371 #ifdef RACCT
5372 void
prison_racct_foreach(void (* callback)(struct racct * racct,void * arg2,void * arg3),void (* pre)(void),void (* post)(void),void * arg2,void * arg3)5373 prison_racct_foreach(void (*callback)(struct racct *racct,
5374 void *arg2, void *arg3), void (*pre)(void), void (*post)(void),
5375 void *arg2, void *arg3)
5376 {
5377 struct prison_racct *prr;
5378
5379 ASSERT_RACCT_ENABLED();
5380
5381 sx_slock(&allprison_lock);
5382 if (pre != NULL)
5383 (pre)();
5384 LIST_FOREACH(prr, &allprison_racct, prr_next)
5385 (callback)(prr->prr_racct, arg2, arg3);
5386 if (post != NULL)
5387 (post)();
5388 sx_sunlock(&allprison_lock);
5389 }
5390
5391 static struct prison_racct *
prison_racct_find_locked(const char * name)5392 prison_racct_find_locked(const char *name)
5393 {
5394 struct prison_racct *prr;
5395
5396 ASSERT_RACCT_ENABLED();
5397 sx_assert(&allprison_lock, SA_XLOCKED);
5398
5399 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
5400 return (NULL);
5401
5402 LIST_FOREACH(prr, &allprison_racct, prr_next) {
5403 if (strcmp(name, prr->prr_name) != 0)
5404 continue;
5405
5406 /* Found prison_racct with a matching name? */
5407 prison_racct_hold(prr);
5408 return (prr);
5409 }
5410
5411 /* Add new prison_racct. */
5412 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
5413 racct_create(&prr->prr_racct);
5414
5415 strcpy(prr->prr_name, name);
5416 refcount_init(&prr->prr_refcount, 1);
5417 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
5418
5419 return (prr);
5420 }
5421
5422 struct prison_racct *
prison_racct_find(const char * name)5423 prison_racct_find(const char *name)
5424 {
5425 struct prison_racct *prr;
5426
5427 ASSERT_RACCT_ENABLED();
5428
5429 sx_xlock(&allprison_lock);
5430 prr = prison_racct_find_locked(name);
5431 sx_xunlock(&allprison_lock);
5432 return (prr);
5433 }
5434
5435 void
prison_racct_hold(struct prison_racct * prr)5436 prison_racct_hold(struct prison_racct *prr)
5437 {
5438
5439 ASSERT_RACCT_ENABLED();
5440
5441 refcount_acquire(&prr->prr_refcount);
5442 }
5443
5444 static void
prison_racct_free_locked(struct prison_racct * prr)5445 prison_racct_free_locked(struct prison_racct *prr)
5446 {
5447
5448 ASSERT_RACCT_ENABLED();
5449 sx_assert(&allprison_lock, SA_XLOCKED);
5450
5451 if (refcount_release(&prr->prr_refcount)) {
5452 racct_destroy(&prr->prr_racct);
5453 LIST_REMOVE(prr, prr_next);
5454 free(prr, M_PRISON_RACCT);
5455 }
5456 }
5457
5458 void
prison_racct_free(struct prison_racct * prr)5459 prison_racct_free(struct prison_racct *prr)
5460 {
5461
5462 ASSERT_RACCT_ENABLED();
5463 sx_assert(&allprison_lock, SA_UNLOCKED);
5464
5465 if (refcount_release_if_not_last(&prr->prr_refcount))
5466 return;
5467
5468 sx_xlock(&allprison_lock);
5469 prison_racct_free_locked(prr);
5470 sx_xunlock(&allprison_lock);
5471 }
5472
5473 static void
prison_racct_attach(struct prison * pr)5474 prison_racct_attach(struct prison *pr)
5475 {
5476 struct prison_racct *prr;
5477
5478 ASSERT_RACCT_ENABLED();
5479 sx_assert(&allprison_lock, SA_XLOCKED);
5480
5481 prr = prison_racct_find_locked(pr->pr_name);
5482 KASSERT(prr != NULL, ("cannot find prison_racct"));
5483
5484 pr->pr_prison_racct = prr;
5485 }
5486
5487 /*
5488 * Handle jail renaming. From the racct point of view, renaming means
5489 * moving from one prison_racct to another.
5490 */
5491 static void
prison_racct_modify(struct prison * pr)5492 prison_racct_modify(struct prison *pr)
5493 {
5494 #ifdef RCTL
5495 struct proc *p;
5496 struct ucred *cred;
5497 #endif
5498 struct prison_racct *oldprr;
5499
5500 ASSERT_RACCT_ENABLED();
5501
5502 sx_slock(&allproc_lock);
5503 sx_xlock(&allprison_lock);
5504
5505 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
5506 sx_xunlock(&allprison_lock);
5507 sx_sunlock(&allproc_lock);
5508 return;
5509 }
5510
5511 oldprr = pr->pr_prison_racct;
5512 pr->pr_prison_racct = NULL;
5513
5514 prison_racct_attach(pr);
5515
5516 /*
5517 * Move resource utilisation records.
5518 */
5519 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
5520
5521 #ifdef RCTL
5522 /*
5523 * Force rctl to reattach rules to processes.
5524 */
5525 FOREACH_PROC_IN_SYSTEM(p) {
5526 PROC_LOCK(p);
5527 cred = crhold(p->p_ucred);
5528 PROC_UNLOCK(p);
5529 rctl_proc_ucred_changed(p, cred);
5530 crfree(cred);
5531 }
5532 #endif
5533
5534 sx_sunlock(&allproc_lock);
5535 prison_racct_free_locked(oldprr);
5536 sx_xunlock(&allprison_lock);
5537 }
5538
5539 static void
prison_racct_detach(struct prison * pr)5540 prison_racct_detach(struct prison *pr)
5541 {
5542
5543 ASSERT_RACCT_ENABLED();
5544 sx_assert(&allprison_lock, SA_UNLOCKED);
5545
5546 if (pr->pr_prison_racct == NULL)
5547 return;
5548 prison_racct_free(pr->pr_prison_racct);
5549 pr->pr_prison_racct = NULL;
5550 }
5551 #endif /* RACCT */
5552
5553 /*
5554 * Submit a knote for a prison, locking if necessary.
5555 */
5556 static void
prison_knote(struct prison * pr,long hint)5557 prison_knote(struct prison *pr, long hint)
5558 {
5559 int locked;
5560
5561 locked = mtx_owned(&pr->pr_mtx);
5562 if (!locked)
5563 mtx_lock(&pr->pr_mtx);
5564 KNOTE_LOCKED(pr->pr_klist, hint);
5565 jaildesc_knote(pr, hint);
5566 if (!locked)
5567 mtx_unlock(&pr->pr_mtx);
5568 }
5569
5570 #ifdef DDB
5571
5572 static void
db_show_prison(struct prison * pr)5573 db_show_prison(struct prison *pr)
5574 {
5575 struct bool_flags *bf;
5576 struct jailsys_flags *jsf;
5577 #if defined(INET) || defined(INET6)
5578 int ii;
5579 struct prison_ip *pip;
5580 #endif
5581 unsigned f;
5582 #ifdef INET
5583 char ip4buf[INET_ADDRSTRLEN];
5584 #endif
5585 #ifdef INET6
5586 char ip6buf[INET6_ADDRSTRLEN];
5587 #endif
5588
5589 db_printf("prison %p:\n", pr);
5590 db_printf(" jid = %d\n", pr->pr_id);
5591 db_printf(" name = %s\n", pr->pr_name);
5592 db_printf(" parent = %p\n", pr->pr_parent);
5593 db_printf(" ref = %d\n", pr->pr_ref);
5594 db_printf(" uref = %d\n", pr->pr_uref);
5595 db_printf(" state = %s\n",
5596 pr->pr_state == PRISON_STATE_ALIVE ? "alive" :
5597 pr->pr_state == PRISON_STATE_DYING ? "dying" :
5598 "invalid");
5599 db_printf(" path = %s\n", pr->pr_path);
5600 db_printf(" cpuset = %d\n", pr->pr_cpuset
5601 ? pr->pr_cpuset->cs_id : -1);
5602 #ifdef VIMAGE
5603 db_printf(" vnet = %p\n", pr->pr_vnet);
5604 #endif
5605 db_printf(" root = %p\n", pr->pr_root);
5606 db_printf(" securelevel = %d\n", pr->pr_securelevel);
5607 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
5608 db_printf(" children.max = %d\n", pr->pr_childmax);
5609 db_printf(" children.cur = %d\n", pr->pr_childcount);
5610 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
5611 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
5612 db_printf(" flags = 0x%x", pr->pr_flags);
5613 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++)
5614 if (pr->pr_flags & bf->flag)
5615 db_printf(" %s", bf->name);
5616 for (jsf = pr_flag_jailsys;
5617 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
5618 jsf++) {
5619 f = pr->pr_flags & (jsf->disable | jsf->new);
5620 db_printf(" %-16s= %s\n", jsf->name,
5621 (f != 0 && f == jsf->disable) ? "disable"
5622 : (f == jsf->new) ? "new"
5623 : "inherit");
5624 }
5625 db_printf(" allow = 0x%x", pr->pr_allow);
5626 for (bf = pr_flag_allow;
5627 bf < pr_flag_allow + nitems(pr_flag_allow) &&
5628 atomic_load_int(&bf->flag) != 0;
5629 bf++)
5630 if (pr->pr_allow & bf->flag)
5631 db_printf(" %s", bf->name);
5632 db_printf("\n");
5633 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
5634 db_printf(" host.hostname = %s\n", pr->pr_hostname);
5635 db_printf(" host.domainname = %s\n", pr->pr_domainname);
5636 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
5637 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
5638 #ifdef INET
5639 if ((pip = pr->pr_addrs[PR_INET]) != NULL) {
5640 db_printf(" ip4s = %d\n", pip->ips);
5641 for (ii = 0; ii < pip->ips; ii++)
5642 db_printf(" %s %s\n",
5643 ii == 0 ? "ip4.addr =" : " ",
5644 inet_ntoa_r(
5645 *(const struct in_addr *)PR_IP(pip, PR_INET, ii),
5646 ip4buf));
5647 }
5648 #endif
5649 #ifdef INET6
5650 if ((pip = pr->pr_addrs[PR_INET6]) != NULL) {
5651 db_printf(" ip6s = %d\n", pip->ips);
5652 for (ii = 0; ii < pip->ips; ii++)
5653 db_printf(" %s %s\n",
5654 ii == 0 ? "ip6.addr =" : " ",
5655 ip6_sprintf(ip6buf,
5656 (const struct in6_addr *)PR_IP(pip, PR_INET6, ii)));
5657 }
5658 #endif
5659 }
5660
DB_SHOW_COMMAND(prison,db_show_prison_command)5661 DB_SHOW_COMMAND(prison, db_show_prison_command)
5662 {
5663 struct prison *pr;
5664
5665 if (!have_addr) {
5666 /*
5667 * Show all prisons in the list, and prison0 which is not
5668 * listed.
5669 */
5670 db_show_prison(&prison0);
5671 if (!db_pager_quit) {
5672 TAILQ_FOREACH(pr, &allprison, pr_list) {
5673 db_show_prison(pr);
5674 if (db_pager_quit)
5675 break;
5676 }
5677 }
5678 return;
5679 }
5680
5681 if (addr == 0)
5682 pr = &prison0;
5683 else {
5684 /* Look for a prison with the ID and with references. */
5685 TAILQ_FOREACH(pr, &allprison, pr_list)
5686 if (pr->pr_id == addr && pr->pr_ref > 0)
5687 break;
5688 if (pr == NULL)
5689 /* Look again, without requiring a reference. */
5690 TAILQ_FOREACH(pr, &allprison, pr_list)
5691 if (pr->pr_id == addr)
5692 break;
5693 if (pr == NULL)
5694 /* Assume address points to a valid prison. */
5695 pr = (struct prison *)addr;
5696 }
5697 db_show_prison(pr);
5698 }
5699
5700 #endif /* DDB */
5701