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 *drflagsp);
161 static int prison_attach_thread_single(struct thread *td);
162 static void prison_attach_thread_single_end(struct thread *td);
163 static void prison_complete(void *context, int pending);
164 static void prison_deref(struct prison *pr, int flags);
165 static void prison_deref_kill(struct prison *pr, struct prisonlist *freeprison);
166 static int prison_lock_xlock(struct prison *pr, int flags);
167 static void prison_cleanup_locked(struct prison *pr);
168 static void prison_cleanup_unlocked(struct prison *pr);
169 static void prison_free_not_last(struct prison *pr);
170 static void prison_proc_free_not_last(struct prison *pr);
171 static void prison_proc_relink(struct prison *opr, struct prison *npr,
172 struct proc *p);
173 static void prison_set_allow_locked(struct prison *pr, unsigned flag,
174 int enable);
175 static char *prison_path(struct prison *pr1, struct prison *pr2);
176 #ifdef RACCT
177 static void prison_racct_attach(struct prison *pr);
178 static void prison_racct_modify(struct prison *pr);
179 static void prison_racct_detach(struct prison *pr);
180 #endif
181 static void prison_knote(struct prison *pr, long hint);
182
183 /* Flags for prison_deref */
184 #define PD_DEREF 0x01 /* Decrement pr_ref */
185 #define PD_DEUREF 0x02 /* Decrement pr_uref */
186 #define PD_KILL 0x04 /* Remove jail, kill processes, etc */
187 #define PD_LOCKED 0x10 /* pr_mtx is held */
188 #define PD_LIST_SLOCKED 0x20 /* allprison_lock is held shared */
189 #define PD_LIST_XLOCKED 0x40 /* allprison_lock is held exclusive */
190 #define PD_OP_FLAGS 0x07 /* Operation flags */
191 #define PD_LOCK_FLAGS 0x70 /* Lock status flags */
192
193 /*
194 * Parameter names corresponding to PR_* flag values. Size values are for kvm
195 * as we cannot figure out the size of a sparse array, or an array without a
196 * terminating entry.
197 */
198 static struct bool_flags pr_flag_bool[] = {
199 {"persist", "nopersist", PR_PERSIST},
200 #ifdef INET
201 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL},
202 #endif
203 #ifdef INET6
204 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL},
205 #endif
206 };
207 const size_t pr_flag_bool_size = sizeof(pr_flag_bool);
208
209 static struct jailsys_flags pr_flag_jailsys[] = {
210 {"host", 0, PR_HOST},
211 #ifdef VIMAGE
212 {"vnet", 0, PR_VNET},
213 #endif
214 #ifdef INET
215 {"ip4", PR_IP4_USER, PR_IP4_USER},
216 #endif
217 #ifdef INET6
218 {"ip6", PR_IP6_USER, PR_IP6_USER},
219 #endif
220 };
221 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
222
223 /*
224 * Make this array full-size so dynamic parameters can be added.
225 * It is protected by prison0.mtx, but lockless reading is allowed
226 * with an atomic check of the flag values.
227 */
228 static struct bool_flags pr_flag_allow[NBBY * NBPW] = {
229 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME},
230 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC},
231 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS},
232 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS},
233 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT},
234 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS},
235 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF},
236 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK},
237 {"allow.reserved_ports", "allow.noreserved_ports",
238 PR_ALLOW_RESERVED_PORTS},
239 {"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF},
240 {"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug",
241 PR_ALLOW_UNPRIV_DEBUG},
242 {"allow.suser", "allow.nosuser", PR_ALLOW_SUSER},
243 #ifdef VIMAGE
244 {"allow.nfsd", "allow.nonfsd", PR_ALLOW_NFSD},
245 #endif
246 {"allow.extattr", "allow.noextattr", PR_ALLOW_EXTATTR},
247 {"allow.adjtime", "allow.noadjtime", PR_ALLOW_ADJTIME},
248 {"allow.settime", "allow.nosettime", PR_ALLOW_SETTIME},
249 {"allow.routing", "allow.norouting", PR_ALLOW_ROUTING},
250 {"allow.unprivileged_parent_tampering",
251 "allow.nounprivileged_parent_tampering",
252 PR_ALLOW_UNPRIV_PARENT_TAMPER},
253 #ifdef AUDIT
254 {"allow.setaudit", "allow.nosetaudit", PR_ALLOW_SETAUDIT},
255 #endif
256 };
257 static unsigned pr_allow_all = PR_ALLOW_ALL_STATIC;
258 const size_t pr_flag_allow_size = sizeof(pr_flag_allow);
259
260 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \
261 PR_ALLOW_RESERVED_PORTS | \
262 PR_ALLOW_UNPRIV_DEBUG | \
263 PR_ALLOW_SUSER)
264 #define JAIL_DEFAULT_ENFORCE_STATFS 2
265 #define JAIL_DEFAULT_DEVFS_RSNUM 0
266 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
267 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
268 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
269 #if defined(INET) || defined(INET6)
270 static unsigned jail_max_af_ips = 255;
271 #endif
272
273 /*
274 * Initialize the parts of prison0 that can't be static-initialized with
275 * constants. This is called from proc0_init() after creating thread0 cpuset.
276 */
277 void
prison0_init(void)278 prison0_init(void)
279 {
280 uint8_t *file, *data;
281 size_t size;
282 char buf[sizeof(prison0.pr_hostuuid)];
283 #ifdef MAC
284 int error __diagused;
285 #endif
286 bool valid;
287
288 #ifdef MAC
289 error = mac_prison_init(&prison0, M_WAITOK);
290 MPASS(error == 0);
291
292 mtx_unlock(&prison0.pr_mtx);
293 #endif
294 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset);
295 prison0.pr_osreldate = osreldate;
296 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease));
297
298 /* If we have a preloaded hostuuid, use it. */
299 file = preload_search_by_type(PRISON0_HOSTUUID_MODULE);
300 if (file != NULL) {
301 data = preload_fetch_addr(file);
302 size = preload_fetch_size(file);
303 if (data != NULL) {
304 /*
305 * The preloaded data may include trailing whitespace, almost
306 * certainly a newline; skip over any whitespace or
307 * non-printable characters to be safe.
308 */
309 while (size > 0 && data[size - 1] <= 0x20) {
310 size--;
311 }
312
313 valid = false;
314
315 /*
316 * Not NUL-terminated when passed from loader, but
317 * validate_uuid requires that due to using sscanf (as
318 * does the subsequent strlcpy, since it still reads
319 * past the given size to return the true length);
320 * bounce to a temporary buffer to fix.
321 */
322 if (size >= sizeof(buf))
323 goto done;
324
325 memcpy(buf, data, size);
326 buf[size] = '\0';
327
328 if (validate_uuid(buf, size, NULL, 0) != 0)
329 goto done;
330
331 valid = true;
332 (void)strlcpy(prison0.pr_hostuuid, buf,
333 sizeof(prison0.pr_hostuuid));
334
335 done:
336 if (bootverbose && !valid) {
337 printf("hostuuid: preload data malformed: '%.*s'\n",
338 (int)size, data);
339 }
340 }
341 }
342 if (bootverbose)
343 printf("hostuuid: using %s\n", prison0.pr_hostuuid);
344 }
345
346 /*
347 * struct jail_args {
348 * struct jail *jail;
349 * };
350 */
351 int
sys_jail(struct thread * td,struct jail_args * uap)352 sys_jail(struct thread *td, struct jail_args *uap)
353 {
354 uint32_t version;
355 int error;
356 struct jail j;
357
358 error = copyin(uap->jail, &version, sizeof(uint32_t));
359 if (error)
360 return (error);
361
362 switch (version) {
363 case 0:
364 {
365 struct jail_v0 j0;
366
367 /* FreeBSD single IPv4 jails. */
368 bzero(&j, sizeof(struct jail));
369 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
370 if (error)
371 return (error);
372 j.version = j0.version;
373 j.path = j0.path;
374 j.hostname = j0.hostname;
375 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */
376 break;
377 }
378
379 case 1:
380 /*
381 * Version 1 was used by multi-IPv4 jail implementations
382 * that never made it into the official kernel.
383 */
384 return (EINVAL);
385
386 case 2: /* JAIL_API_VERSION */
387 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
388 error = copyin(uap->jail, &j, sizeof(struct jail));
389 if (error)
390 return (error);
391 break;
392
393 default:
394 /* Sci-Fi jails are not supported, sorry. */
395 return (EINVAL);
396 }
397 return (kern_jail(td, &j));
398 }
399
400 int
kern_jail(struct thread * td,struct jail * j)401 kern_jail(struct thread *td, struct jail *j)
402 {
403 struct iovec optiov[2 * (4 + nitems(pr_flag_allow)
404 #ifdef INET
405 + 1
406 #endif
407 #ifdef INET6
408 + 1
409 #endif
410 )];
411 struct uio opt;
412 char *u_path, *u_hostname, *u_name;
413 struct bool_flags *bf;
414 #ifdef INET
415 uint32_t ip4s;
416 struct in_addr *u_ip4;
417 #endif
418 #ifdef INET6
419 struct in6_addr *u_ip6;
420 #endif
421 size_t tmplen;
422 int error, enforce_statfs;
423
424 bzero(&optiov, sizeof(optiov));
425 opt.uio_iov = optiov;
426 opt.uio_iovcnt = 0;
427 opt.uio_offset = -1;
428 opt.uio_resid = -1;
429 opt.uio_segflg = UIO_SYSSPACE;
430 opt.uio_rw = UIO_READ;
431 opt.uio_td = td;
432
433 /* Set permissions for top-level jails from sysctls. */
434 if (!jailed(td->td_ucred)) {
435 for (bf = pr_flag_allow;
436 bf < pr_flag_allow + nitems(pr_flag_allow) &&
437 atomic_load_int(&bf->flag) != 0;
438 bf++) {
439 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *,
440 (jail_default_allow & bf->flag)
441 ? bf->name : bf->noname);
442 optiov[opt.uio_iovcnt].iov_len =
443 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
444 opt.uio_iovcnt += 2;
445 }
446 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
447 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
448 opt.uio_iovcnt++;
449 enforce_statfs = jail_default_enforce_statfs;
450 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
451 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
452 opt.uio_iovcnt++;
453 }
454
455 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
456 #ifdef INET
457 ip4s = (j->version == 0) ? 1 : j->ip4s;
458 if (ip4s > jail_max_af_ips)
459 return (EINVAL);
460 tmplen += ip4s * sizeof(struct in_addr);
461 #else
462 if (j->ip4s > 0)
463 return (EINVAL);
464 #endif
465 #ifdef INET6
466 if (j->ip6s > jail_max_af_ips)
467 return (EINVAL);
468 tmplen += j->ip6s * sizeof(struct in6_addr);
469 #else
470 if (j->ip6s > 0)
471 return (EINVAL);
472 #endif
473 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
474 u_hostname = u_path + MAXPATHLEN;
475 u_name = u_hostname + MAXHOSTNAMELEN;
476 #ifdef INET
477 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
478 #endif
479 #ifdef INET6
480 #ifdef INET
481 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
482 #else
483 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
484 #endif
485 #endif
486 optiov[opt.uio_iovcnt].iov_base = "path";
487 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
488 opt.uio_iovcnt++;
489 optiov[opt.uio_iovcnt].iov_base = u_path;
490 error = copyinstr(j->path, u_path, MAXPATHLEN,
491 &optiov[opt.uio_iovcnt].iov_len);
492 if (error) {
493 free(u_path, M_TEMP);
494 return (error);
495 }
496 opt.uio_iovcnt++;
497 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
498 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
499 opt.uio_iovcnt++;
500 optiov[opt.uio_iovcnt].iov_base = u_hostname;
501 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
502 &optiov[opt.uio_iovcnt].iov_len);
503 if (error) {
504 free(u_path, M_TEMP);
505 return (error);
506 }
507 opt.uio_iovcnt++;
508 if (j->jailname != NULL) {
509 optiov[opt.uio_iovcnt].iov_base = "name";
510 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
511 opt.uio_iovcnt++;
512 optiov[opt.uio_iovcnt].iov_base = u_name;
513 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
514 &optiov[opt.uio_iovcnt].iov_len);
515 if (error) {
516 free(u_path, M_TEMP);
517 return (error);
518 }
519 opt.uio_iovcnt++;
520 }
521 #ifdef INET
522 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
523 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
524 opt.uio_iovcnt++;
525 optiov[opt.uio_iovcnt].iov_base = u_ip4;
526 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
527 if (j->version == 0)
528 u_ip4->s_addr = j->ip4s;
529 else {
530 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
531 if (error) {
532 free(u_path, M_TEMP);
533 return (error);
534 }
535 }
536 opt.uio_iovcnt++;
537 #endif
538 #ifdef INET6
539 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
540 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
541 opt.uio_iovcnt++;
542 optiov[opt.uio_iovcnt].iov_base = u_ip6;
543 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
544 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
545 if (error) {
546 free(u_path, M_TEMP);
547 return (error);
548 }
549 opt.uio_iovcnt++;
550 #endif
551 KASSERT(opt.uio_iovcnt <= nitems(optiov),
552 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
553 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
554 free(u_path, M_TEMP);
555 return (error);
556 }
557
558 /*
559 * struct jail_set_args {
560 * struct iovec *iovp;
561 * unsigned int iovcnt;
562 * int flags;
563 * };
564 */
565 int
sys_jail_set(struct thread * td,struct jail_set_args * uap)566 sys_jail_set(struct thread *td, struct jail_set_args *uap)
567 {
568 struct uio *auio;
569 int error;
570
571 /* Check that we have an even number of iovecs. */
572 if (uap->iovcnt & 1)
573 return (EINVAL);
574
575 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
576 if (error)
577 return (error);
578 error = kern_jail_set(td, auio, uap->flags);
579 freeuio(auio);
580 return (error);
581 }
582
583 #if defined(INET) || defined(INET6)
584 typedef int prison_addr_cmp_t(const void *, const void *);
585 typedef bool prison_addr_valid_t(const void *);
586 static const struct pr_family {
587 size_t size;
588 prison_addr_cmp_t *cmp;
589 prison_addr_valid_t *valid;
590 int ip_flag;
591 } pr_families[PR_FAMILY_MAX] = {
592 #ifdef INET
593 [PR_INET] = {
594 .size = sizeof(struct in_addr),
595 .cmp = prison_qcmp_v4,
596 .valid = prison_valid_v4,
597 .ip_flag = PR_IP4_USER,
598 },
599 #endif
600 #ifdef INET6
601 [PR_INET6] = {
602 .size = sizeof(struct in6_addr),
603 .cmp = prison_qcmp_v6,
604 .valid = prison_valid_v6,
605 .ip_flag = PR_IP6_USER,
606 },
607 #endif
608 };
609
610 /*
611 * Network address lists (pr_addrs) allocation for jails. The addresses
612 * are accessed locklessly by the network stack, thus need to be protected by
613 * the network epoch.
614 */
615 struct prison_ip {
616 struct epoch_context ctx;
617 uint32_t ips;
618 #ifdef FUTURE_C
619 /*
620 * XXX Variable-length automatic arrays in union may be
621 * supported in future C.
622 */
623 union {
624 char pr_ip[];
625 struct in_addr pr_ip4[];
626 struct in6_addr pr_ip6[];
627 };
628 #else /* No future C :( */
629 char pr_ip[];
630 #endif
631 };
632
633 static char *
PR_IP(struct prison_ip * pip,const pr_family_t af,int idx)634 PR_IP(struct prison_ip *pip, const pr_family_t af, int idx)
635 {
636 MPASS(pip);
637 MPASS(af < PR_FAMILY_MAX);
638 MPASS(idx >= 0 && idx < pip->ips);
639
640 return (pip->pr_ip + pr_families[af].size * idx);
641 }
642
643 static struct prison_ip *
prison_ip_alloc(const pr_family_t af,uint32_t cnt,int flags)644 prison_ip_alloc(const pr_family_t af, uint32_t cnt, int flags)
645 {
646 struct prison_ip *pip;
647
648 pip = malloc(sizeof(struct prison_ip) + cnt * pr_families[af].size,
649 M_PRISON, flags);
650 if (pip != NULL)
651 pip->ips = cnt;
652 return (pip);
653 }
654
655 /*
656 * Allocate and copyin user supplied address list, sorting and validating.
657 * kern_jail_set() helper.
658 */
659 static struct prison_ip *
prison_ip_copyin(const pr_family_t af,void * op,uint32_t cnt)660 prison_ip_copyin(const pr_family_t af, void *op, uint32_t cnt)
661 {
662 prison_addr_cmp_t *const cmp = pr_families[af].cmp;
663 const size_t size = pr_families[af].size;
664 struct prison_ip *pip;
665
666 pip = prison_ip_alloc(af, cnt, M_WAITOK);
667 bcopy(op, pip->pr_ip, cnt * size);
668 /*
669 * IP addresses are all sorted but ip[0] to preserve
670 * the primary IP address as given from userland.
671 * This special IP is used for unbound outgoing
672 * connections as well for "loopback" traffic in case
673 * source address selection cannot find any more fitting
674 * address to connect from.
675 */
676 if (cnt > 1)
677 qsort(PR_IP(pip, af, 1), cnt - 1, size, cmp);
678 /*
679 * Check for duplicate addresses and do some simple
680 * zero and broadcast checks. If users give other bogus
681 * addresses it is their problem.
682 */
683 for (int i = 0; i < cnt; i++) {
684 if (!pr_families[af].valid(PR_IP(pip, af, i))) {
685 free(pip, M_PRISON);
686 return (NULL);
687 }
688 if (i + 1 < cnt &&
689 (cmp(PR_IP(pip, af, 0), PR_IP(pip, af, i + 1)) == 0 ||
690 cmp(PR_IP(pip, af, i), PR_IP(pip, af, i + 1)) == 0)) {
691 free(pip, M_PRISON);
692 return (NULL);
693 }
694 }
695
696 return (pip);
697 }
698
699 /*
700 * Allocate and dup parent prison address list.
701 * kern_jail_set() helper.
702 */
703 static void
prison_ip_dup(struct prison * ppr,struct prison * pr,const pr_family_t af)704 prison_ip_dup(struct prison *ppr, struct prison *pr, const pr_family_t af)
705 {
706 const struct prison_ip *ppip = ppr->pr_addrs[af];
707 struct prison_ip *pip;
708
709 if (ppip != NULL) {
710 pip = prison_ip_alloc(af, ppip->ips, M_WAITOK);
711 bcopy(ppip->pr_ip, pip->pr_ip, pip->ips * pr_families[af].size);
712 pr->pr_addrs[af] = pip;
713 }
714 }
715
716 /*
717 * Make sure the new set of IP addresses is a subset of the parent's list.
718 * Don't worry about the parent being unlocked, as any setting is done with
719 * allprison_lock held.
720 * kern_jail_set() helper.
721 */
722 static bool
prison_ip_parent_match(struct prison_ip * ppip,struct prison_ip * pip,const pr_family_t af)723 prison_ip_parent_match(struct prison_ip *ppip, struct prison_ip *pip,
724 const pr_family_t af)
725 {
726 prison_addr_cmp_t *const cmp = pr_families[af].cmp;
727 int i, j;
728
729 if (ppip == NULL)
730 return (false);
731
732 for (i = 0; i < ppip->ips; i++)
733 if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, i)) == 0)
734 break;
735
736 if (i == ppip->ips)
737 /* Main address not present in parent. */
738 return (false);
739
740 if (pip->ips > 1) {
741 for (i = j = 1; i < pip->ips; i++) {
742 if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0)
743 /* Equals to parent primary address. */
744 continue;
745 for (; j < ppip->ips; j++)
746 if (cmp(PR_IP(pip, af, i),
747 PR_IP(ppip, af, j)) == 0)
748 break;
749 if (j == ppip->ips)
750 break;
751 }
752 if (j == ppip->ips)
753 /* Address not present in parent. */
754 return (false);
755 }
756 return (true);
757 }
758
759 /*
760 * Check for conflicting IP addresses. We permit them if there is no more
761 * than one IP on each jail. If there is a duplicate on a jail with more
762 * than one IP stop checking and return error.
763 * kern_jail_set() helper.
764 */
765 static bool
prison_ip_conflict_check(const struct prison * ppr,const struct prison * pr,struct prison_ip * pip,pr_family_t af)766 prison_ip_conflict_check(const struct prison *ppr, const struct prison *pr,
767 struct prison_ip *pip, pr_family_t af)
768 {
769 const struct prison *tppr, *tpr;
770 int descend;
771
772 #ifdef VIMAGE
773 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent)
774 if (tppr->pr_flags & PR_VNET)
775 break;
776 #else
777 tppr = &prison0;
778 #endif
779 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
780 if (tpr == pr ||
781 #ifdef VIMAGE
782 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
783 #endif
784 !prison_isalive(tpr)) {
785 descend = 0;
786 continue;
787 }
788 if (!(tpr->pr_flags & pr_families[af].ip_flag))
789 continue;
790 descend = 0;
791 if (tpr->pr_addrs[af] == NULL ||
792 (pip->ips == 1 && tpr->pr_addrs[af]->ips == 1))
793 continue;
794 for (int i = 0; i < pip->ips; i++)
795 if (prison_ip_check(tpr, af, PR_IP(pip, af, i)) == 0)
796 return (false);
797 }
798
799 return (true);
800 }
801
802 _Static_assert(offsetof(struct prison_ip, ctx) == 0,
803 "prison must start with epoch context");
804 static void
prison_ip_free_deferred(epoch_context_t ctx)805 prison_ip_free_deferred(epoch_context_t ctx)
806 {
807
808 free(ctx, M_PRISON);
809 }
810
811 static void
prison_ip_free(struct prison_ip * pip)812 prison_ip_free(struct prison_ip *pip)
813 {
814
815 if (pip != NULL)
816 NET_EPOCH_CALL(prison_ip_free_deferred, &pip->ctx);
817 }
818
819 static void
prison_ip_set(struct prison * pr,const pr_family_t af,struct prison_ip * new)820 prison_ip_set(struct prison *pr, const pr_family_t af, struct prison_ip *new)
821 {
822 struct prison_ip **mem, *old;
823
824 mtx_assert(&pr->pr_mtx, MA_OWNED);
825
826 mem = &pr->pr_addrs[af];
827
828 old = *mem;
829 atomic_store_ptr(mem, new);
830 prison_ip_free(old);
831 }
832
833 /*
834 * Restrict a prison's IP address list with its parent's, possibly replacing
835 * it. Return true if succeed, otherwise should redo.
836 * kern_jail_set() helper.
837 */
838 static bool
prison_ip_restrict(struct prison * pr,const pr_family_t af,struct prison_ip ** newp)839 prison_ip_restrict(struct prison *pr, const pr_family_t af,
840 struct prison_ip **newp)
841 {
842 struct prison_ip *ppip = pr->pr_parent->pr_addrs[af];
843 struct prison_ip *pip = pr->pr_addrs[af];
844 int (*const cmp)(const void *, const void *) = pr_families[af].cmp;
845 const size_t size = pr_families[af].size;
846 struct prison_ip *new = newp != NULL ? *newp : NULL;
847 uint32_t ips;
848
849 mtx_assert(&pr->pr_mtx, MA_OWNED);
850
851 /*
852 * Due to epoch-synchronized access to the IP address lists we always
853 * allocate a new list even if the old one has enough space. We could
854 * atomically update an IPv4 address inside a list, but that would
855 * screw up sorting, and in case of IPv6 we can't even atomically write
856 * one.
857 */
858 if (ppip == NULL) {
859 if (pip != NULL)
860 prison_ip_set(pr, af, NULL);
861 return (true);
862 }
863
864 if (!(pr->pr_flags & pr_families[af].ip_flag)) {
865 if (new == NULL) {
866 new = prison_ip_alloc(af, ppip->ips, M_NOWAIT);
867 if (new == NULL)
868 return (false); /* Redo */
869 }
870 /* This has no user settings, so just copy the parent's list. */
871 MPASS(new->ips == ppip->ips);
872 bcopy(ppip->pr_ip, new->pr_ip, ppip->ips * size);
873 prison_ip_set(pr, af, new);
874 if (newp != NULL)
875 *newp = NULL; /* Used */
876 } else if (pip != NULL) {
877 /* Remove addresses that aren't in the parent. */
878 int i;
879
880 i = 0; /* index in pip */
881 ips = 0; /* index in new */
882
883 if (new == NULL) {
884 new = prison_ip_alloc(af, pip->ips, M_NOWAIT);
885 if (new == NULL)
886 return (false); /* Redo */
887 }
888
889 for (int pi = 0; pi < ppip->ips; pi++)
890 if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, pi)) == 0) {
891 /* Found our primary address in parent. */
892 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips),
893 size);
894 i++;
895 ips++;
896 break;
897 }
898 for (int pi = 1; i < pip->ips; ) {
899 /* Check against primary, which is unsorted. */
900 if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0) {
901 /* Matches parent's primary address. */
902 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips),
903 size);
904 i++;
905 ips++;
906 continue;
907 }
908 /* The rest are sorted. */
909 switch (pi >= ppip->ips ? -1 :
910 cmp(PR_IP(pip, af, i), PR_IP(ppip, af, pi))) {
911 case -1:
912 i++;
913 break;
914 case 0:
915 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips),
916 size);
917 i++;
918 pi++;
919 ips++;
920 break;
921 case 1:
922 pi++;
923 break;
924 }
925 }
926 if (ips == 0) {
927 if (newp == NULL || *newp == NULL)
928 prison_ip_free(new);
929 new = NULL;
930 } else {
931 /* Shrink to real size */
932 KASSERT((new->ips >= ips),
933 ("Out-of-bounds write to prison_ip %p", new));
934 new->ips = ips;
935 }
936 prison_ip_set(pr, af, new);
937 if (newp != NULL)
938 *newp = NULL; /* Used */
939 }
940 return (true);
941 }
942
943 /*
944 * Fast-path check if an address belongs to a prison.
945 */
946 int
prison_ip_check(const struct prison * pr,const pr_family_t af,const void * addr)947 prison_ip_check(const struct prison *pr, const pr_family_t af,
948 const void *addr)
949 {
950 int (*const cmp)(const void *, const void *) = pr_families[af].cmp;
951 struct prison_ip *pip;
952 int i, a, z, d;
953
954 MPASS(mtx_owned(&pr->pr_mtx) ||
955 in_epoch(net_epoch_preempt) ||
956 sx_xlocked(&allprison_lock));
957
958 pip = atomic_load_ptr(&pr->pr_addrs[af]);
959 if (__predict_false(pip == NULL))
960 return (EAFNOSUPPORT);
961
962 /* Check the primary IP. */
963 if (cmp(PR_IP(pip, af, 0), addr) == 0)
964 return (0);
965
966 /*
967 * All the other IPs are sorted so we can do a binary search.
968 */
969 a = 0;
970 z = pip->ips - 2;
971 while (a <= z) {
972 i = (a + z) / 2;
973 d = cmp(PR_IP(pip, af, i + 1), addr);
974 if (d > 0)
975 z = i - 1;
976 else if (d < 0)
977 a = i + 1;
978 else
979 return (0);
980 }
981
982 return (EADDRNOTAVAIL);
983 }
984
985 /*
986 * Grab primary IP. Historically required mutex, but nothing prevents
987 * us to support epoch-protected access. Is it used in fast path?
988 * in{6}_jail.c helper
989 */
990 const void *
prison_ip_get0(const struct prison * pr,const pr_family_t af)991 prison_ip_get0(const struct prison *pr, const pr_family_t af)
992 {
993 const struct prison_ip *pip = pr->pr_addrs[af];
994
995 mtx_assert(&pr->pr_mtx, MA_OWNED);
996 MPASS(pip);
997
998 return (pip->pr_ip);
999 }
1000
1001 u_int
prison_ip_cnt(const struct prison * pr,const pr_family_t af)1002 prison_ip_cnt(const struct prison *pr, const pr_family_t af)
1003 {
1004
1005 return (pr->pr_addrs[af]->ips);
1006 }
1007 #endif /* defined(INET) || defined(INET6) */
1008
1009 int
kern_jail_set(struct thread * td,struct uio * optuio,int flags)1010 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
1011 {
1012 struct file *jfp_out;
1013 struct nameidata nd;
1014 #ifdef INET
1015 struct prison_ip *ip4;
1016 #endif
1017 #ifdef INET6
1018 struct prison_ip *ip6;
1019 #endif
1020 struct vfsopt *opt;
1021 struct vfsoptlist *opts;
1022 struct prison *pr, *deadpr, *dinspr, *inspr, *mypr, *ppr, *tpr;
1023 struct ucred *jdcred;
1024 struct vnode *root;
1025 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
1026 char *g_path, *osrelstr;
1027 struct bool_flags *bf;
1028 struct jailsys_flags *jsf;
1029 #if defined(INET) || defined(INET6)
1030 void *op;
1031 #endif
1032 unsigned long hid;
1033 size_t namelen, onamelen, pnamelen;
1034 #ifdef MAC
1035 void *mac_set_prison_data = NULL;
1036 int gotmaclabel;
1037 #endif
1038 int created, cuflags, descend, drflags, enforce;
1039 int error, errmsg_len, errmsg_pos;
1040 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
1041 int deadid, jfd_in, jfd_out, jfd_pos, jid, jsys, len, level;
1042 int childmax, osreldt, rsnum, slevel;
1043 #ifdef INET
1044 int ip4s;
1045 bool redo_ip4;
1046 #endif
1047 #ifdef INET6
1048 int ip6s;
1049 bool redo_ip6;
1050 #endif
1051 bool maybe_changed;
1052 uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
1053 uint64_t pr_allow_diff;
1054 unsigned tallow;
1055 char numbuf[12];
1056
1057 mypr = td->td_ucred->cr_prison;
1058 if (((flags & (JAIL_CREATE | JAIL_AT_DESC)) == JAIL_CREATE) &&
1059 mypr->pr_childmax == 0)
1060 return (EPERM);
1061 if (flags & ~JAIL_SET_MASK)
1062 return (EINVAL);
1063 if ((flags & (JAIL_USE_DESC | JAIL_AT_DESC)) ==
1064 (JAIL_USE_DESC | JAIL_AT_DESC))
1065 return (EINVAL);
1066
1067 /* Only let a single thread in the process try to attach at a time. */
1068 if (flags & JAIL_ATTACH) {
1069 error = prison_attach_thread_single(td);
1070 if (error != 0)
1071 return (error);
1072 }
1073
1074 #ifdef INET
1075 ip4 = NULL;
1076 #endif
1077 #ifdef INET6
1078 ip6 = NULL;
1079 #endif
1080 g_path = NULL;
1081 jfp_out = NULL;
1082 jfd_out = -1;
1083 prison_hold(mypr);
1084 /*
1085 * Check all the parameters before committing to anything. Not all
1086 * errors can be caught early, but we may as well try. Also, this
1087 * takes care of some expensive stuff (path lookup) before getting
1088 * the allprison lock.
1089 *
1090 * XXX Jails are not filesystems, and jail parameters are not mount
1091 * options. But it makes more sense to re-use the vfsopt code
1092 * than duplicate it under a different name.
1093 */
1094 error = vfs_buildopts(optuio, &opts);
1095 if (error) {
1096 opts = NULL;
1097 goto done_free;
1098 }
1099
1100 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
1101 if (!cuflags) {
1102 error = EINVAL;
1103 vfs_opterror(opts, "no valid operation (create or update)");
1104 goto done_errmsg;
1105 }
1106
1107 error = vfs_copyopt(opts, "desc", &jfd_in, sizeof(jfd_in));
1108 if (error == ENOENT) {
1109 if (flags & (JAIL_USE_DESC | JAIL_AT_DESC | JAIL_GET_DESC |
1110 JAIL_OWN_DESC)) {
1111 vfs_opterror(opts, "missing desc");
1112 goto done_errmsg;
1113 }
1114 jfd_in = -1;
1115 } else if (error != 0)
1116 goto done_free;
1117 else {
1118 if (!(flags & (JAIL_USE_DESC | JAIL_AT_DESC | JAIL_GET_DESC |
1119 JAIL_OWN_DESC))) {
1120 error = EINVAL;
1121 vfs_opterror(opts, "unexpected desc");
1122 goto done_errmsg;
1123 }
1124 if (flags & JAIL_AT_DESC) {
1125 /*
1126 * Look up and create jails based on the
1127 * descriptor's prison.
1128 */
1129 struct prison *jdpr;
1130
1131 error = jaildesc_find(td, jfd_in, &jdpr, NULL);
1132 if (error != 0) {
1133 vfs_opterror(opts, error == ENOENT ?
1134 "descriptor to dead jail" :
1135 "not a jail descriptor");
1136 goto done_errmsg;
1137 }
1138 prison_free(mypr);
1139 mypr = jdpr;
1140 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) {
1141 error = EPERM;
1142 goto done_free;
1143 }
1144 }
1145 if (flags & (JAIL_GET_DESC | JAIL_OWN_DESC)) {
1146 /* Allocate a jail descriptor to return later. */
1147 error = jaildesc_alloc(td, &jfp_out, &jfd_out,
1148 flags & JAIL_OWN_DESC);
1149 if (error)
1150 goto done_free;
1151 }
1152 }
1153
1154 /*
1155 * Delay the permission check if using a jail descriptor,
1156 * until we get the descriptor's credentials.
1157 */
1158 if (!(flags & JAIL_USE_DESC)) {
1159 error = priv_check(td, PRIV_JAIL_SET);
1160 if (error == 0 && (flags & JAIL_ATTACH))
1161 error = priv_check(td, PRIV_JAIL_ATTACH);
1162 if (error)
1163 goto done_free;
1164 }
1165
1166 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
1167 if (error == ENOENT)
1168 jid = 0;
1169 else if (error != 0)
1170 goto done_free;
1171
1172 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
1173 if (error == ENOENT)
1174 gotslevel = 0;
1175 else if (error != 0)
1176 goto done_free;
1177 else
1178 gotslevel = 1;
1179
1180 error =
1181 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
1182 if (error == ENOENT)
1183 gotchildmax = 0;
1184 else if (error != 0)
1185 goto done_free;
1186 else
1187 gotchildmax = 1;
1188
1189 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
1190 if (error == ENOENT)
1191 gotenforce = 0;
1192 else if (error != 0)
1193 goto done_free;
1194 else if (enforce < 0 || enforce > 2) {
1195 error = EINVAL;
1196 goto done_free;
1197 } else
1198 gotenforce = 1;
1199
1200 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
1201 if (error == ENOENT)
1202 gotrsnum = 0;
1203 else if (error != 0)
1204 goto done_free;
1205 else
1206 gotrsnum = 1;
1207
1208 pr_flags = ch_flags = 0;
1209 for (bf = pr_flag_bool;
1210 bf < pr_flag_bool + nitems(pr_flag_bool);
1211 bf++) {
1212 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag);
1213 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag);
1214 }
1215 ch_flags |= pr_flags;
1216 for (jsf = pr_flag_jailsys;
1217 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
1218 jsf++) {
1219 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys));
1220 if (error == ENOENT)
1221 continue;
1222 if (error != 0)
1223 goto done_free;
1224 switch (jsys) {
1225 case JAIL_SYS_DISABLE:
1226 if (!jsf->disable) {
1227 error = EINVAL;
1228 goto done_free;
1229 }
1230 pr_flags |= jsf->disable;
1231 break;
1232 case JAIL_SYS_NEW:
1233 pr_flags |= jsf->new;
1234 break;
1235 case JAIL_SYS_INHERIT:
1236 break;
1237 default:
1238 error = EINVAL;
1239 goto done_free;
1240 }
1241 ch_flags |= jsf->new | jsf->disable;
1242 }
1243 if ((flags & (JAIL_CREATE | JAIL_ATTACH)) == JAIL_CREATE
1244 && !(pr_flags & PR_PERSIST)) {
1245 error = EINVAL;
1246 vfs_opterror(opts, "new jail must persist or attach");
1247 goto done_errmsg;
1248 }
1249 #ifdef VIMAGE
1250 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
1251 error = EINVAL;
1252 vfs_opterror(opts, "vnet cannot be changed after creation");
1253 goto done_errmsg;
1254 }
1255 #endif
1256 #ifdef INET
1257 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
1258 error = EINVAL;
1259 vfs_opterror(opts, "ip4 cannot be changed after creation");
1260 goto done_errmsg;
1261 }
1262 #endif
1263 #ifdef INET6
1264 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
1265 error = EINVAL;
1266 vfs_opterror(opts, "ip6 cannot be changed after creation");
1267 goto done_errmsg;
1268 }
1269 #endif
1270
1271 pr_allow = ch_allow = 0;
1272 for (bf = pr_flag_allow;
1273 bf < pr_flag_allow + nitems(pr_flag_allow) &&
1274 atomic_load_int(&bf->flag) != 0;
1275 bf++) {
1276 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag);
1277 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag);
1278 }
1279 ch_allow |= pr_allow;
1280
1281 error = vfs_getopt(opts, "name", (void **)&name, &len);
1282 if (error == ENOENT)
1283 name = NULL;
1284 else if (error != 0)
1285 goto done_free;
1286 else {
1287 if (len == 0 || name[len - 1] != '\0') {
1288 error = EINVAL;
1289 goto done_free;
1290 }
1291 if (len > MAXHOSTNAMELEN) {
1292 error = ENAMETOOLONG;
1293 goto done_free;
1294 }
1295 }
1296
1297 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
1298 if (error == ENOENT)
1299 host = NULL;
1300 else if (error != 0)
1301 goto done_free;
1302 else {
1303 ch_flags |= PR_HOST;
1304 pr_flags |= PR_HOST;
1305 if (len == 0 || host[len - 1] != '\0') {
1306 error = EINVAL;
1307 goto done_free;
1308 }
1309 if (len > MAXHOSTNAMELEN) {
1310 error = ENAMETOOLONG;
1311 goto done_free;
1312 }
1313 }
1314
1315 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
1316 if (error == ENOENT)
1317 domain = NULL;
1318 else if (error != 0)
1319 goto done_free;
1320 else {
1321 ch_flags |= PR_HOST;
1322 pr_flags |= PR_HOST;
1323 if (len == 0 || domain[len - 1] != '\0') {
1324 error = EINVAL;
1325 goto done_free;
1326 }
1327 if (len > MAXHOSTNAMELEN) {
1328 error = ENAMETOOLONG;
1329 goto done_free;
1330 }
1331 }
1332
1333 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
1334 if (error == ENOENT)
1335 uuid = NULL;
1336 else if (error != 0)
1337 goto done_free;
1338 else {
1339 ch_flags |= PR_HOST;
1340 pr_flags |= PR_HOST;
1341 if (len == 0 || uuid[len - 1] != '\0') {
1342 error = EINVAL;
1343 goto done_free;
1344 }
1345 if (len > HOSTUUIDLEN) {
1346 error = ENAMETOOLONG;
1347 goto done_free;
1348 }
1349 }
1350
1351 #ifdef COMPAT_FREEBSD32
1352 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
1353 uint32_t hid32;
1354
1355 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
1356 hid = hid32;
1357 } else
1358 #endif
1359 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
1360 if (error == ENOENT)
1361 gothid = 0;
1362 else if (error != 0)
1363 goto done_free;
1364 else {
1365 gothid = 1;
1366 ch_flags |= PR_HOST;
1367 pr_flags |= PR_HOST;
1368 }
1369
1370 #ifdef MAC
1371 /* Process the mac.label vfsopt */
1372 error = mac_set_prison_prepare(td, opts, &mac_set_prison_data);
1373 if (error == ENOENT)
1374 gotmaclabel = 0;
1375 else if (error != 0)
1376 goto done_errmsg;
1377 else
1378 gotmaclabel = 1;
1379 #endif
1380
1381 #ifdef INET
1382 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
1383 if (error == ENOENT)
1384 ip4s = 0;
1385 else if (error != 0)
1386 goto done_free;
1387 else if (ip4s & (sizeof(struct in_addr) - 1)) {
1388 error = EINVAL;
1389 goto done_free;
1390 } else {
1391 ch_flags |= PR_IP4_USER;
1392 pr_flags |= PR_IP4_USER;
1393 if (ip4s > 0) {
1394 ip4s /= sizeof(struct in_addr);
1395 if (ip4s > jail_max_af_ips) {
1396 error = EINVAL;
1397 vfs_opterror(opts, "too many IPv4 addresses");
1398 goto done_errmsg;
1399 }
1400 ip4 = prison_ip_copyin(PR_INET, op, ip4s);
1401 if (ip4 == NULL) {
1402 error = EINVAL;
1403 goto done_free;
1404 }
1405 }
1406 }
1407 #endif
1408
1409 #ifdef INET6
1410 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
1411 if (error == ENOENT)
1412 ip6s = 0;
1413 else if (error != 0)
1414 goto done_free;
1415 else if (ip6s & (sizeof(struct in6_addr) - 1)) {
1416 error = EINVAL;
1417 goto done_free;
1418 } else {
1419 ch_flags |= PR_IP6_USER;
1420 pr_flags |= PR_IP6_USER;
1421 if (ip6s > 0) {
1422 ip6s /= sizeof(struct in6_addr);
1423 if (ip6s > jail_max_af_ips) {
1424 error = EINVAL;
1425 vfs_opterror(opts, "too many IPv6 addresses");
1426 goto done_errmsg;
1427 }
1428 ip6 = prison_ip_copyin(PR_INET6, op, ip6s);
1429 if (ip6 == NULL) {
1430 error = EINVAL;
1431 goto done_free;
1432 }
1433 }
1434 }
1435 #endif
1436
1437 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1438 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1439 error = EINVAL;
1440 vfs_opterror(opts,
1441 "vnet jails cannot have IP address restrictions");
1442 goto done_errmsg;
1443 }
1444 #endif
1445
1446 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len);
1447 if (error == ENOENT)
1448 osrelstr = NULL;
1449 else if (error != 0)
1450 goto done_free;
1451 else {
1452 if (flags & JAIL_UPDATE) {
1453 error = EINVAL;
1454 vfs_opterror(opts,
1455 "osrelease cannot be changed after creation");
1456 goto done_errmsg;
1457 }
1458 if (len == 0 || osrelstr[len - 1] != '\0') {
1459 error = EINVAL;
1460 goto done_free;
1461 }
1462 if (len >= OSRELEASELEN) {
1463 error = ENAMETOOLONG;
1464 vfs_opterror(opts,
1465 "osrelease string must be 1-%d bytes long",
1466 OSRELEASELEN - 1);
1467 goto done_errmsg;
1468 }
1469 }
1470
1471 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt));
1472 if (error == ENOENT)
1473 osreldt = 0;
1474 else if (error != 0)
1475 goto done_free;
1476 else {
1477 if (flags & JAIL_UPDATE) {
1478 error = EINVAL;
1479 vfs_opterror(opts,
1480 "osreldate cannot be changed after creation");
1481 goto done_errmsg;
1482 }
1483 if (osreldt == 0) {
1484 error = EINVAL;
1485 vfs_opterror(opts, "osreldate cannot be 0");
1486 goto done_errmsg;
1487 }
1488 }
1489
1490 root = NULL;
1491 error = vfs_getopt(opts, "path", (void **)&path, &len);
1492 if (error == ENOENT)
1493 path = NULL;
1494 else if (error != 0)
1495 goto done_free;
1496 else {
1497 if (flags & JAIL_UPDATE) {
1498 error = EINVAL;
1499 vfs_opterror(opts,
1500 "path cannot be changed after creation");
1501 goto done_errmsg;
1502 }
1503 if (len == 0 || path[len - 1] != '\0') {
1504 error = EINVAL;
1505 goto done_free;
1506 }
1507 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path);
1508 error = namei(&nd);
1509 if (error)
1510 goto done_free;
1511 root = nd.ni_vp;
1512 NDFREE_PNBUF(&nd);
1513 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1514 strlcpy(g_path, path, MAXPATHLEN);
1515 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
1516 if (error == 0) {
1517 path = g_path;
1518 } else {
1519 /* exit on other errors */
1520 goto done_free;
1521 }
1522 if (root->v_type != VDIR) {
1523 error = ENOTDIR;
1524 vput(root);
1525 goto done_free;
1526 }
1527 VOP_UNLOCK(root);
1528 }
1529
1530 /*
1531 * Find the specified jail, or at least its parent.
1532 * This abuses the file error codes ENOENT and EEXIST.
1533 */
1534 pr = NULL;
1535 inspr = NULL;
1536 deadpr = NULL;
1537 maybe_changed = false;
1538 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
1539 namelc = strrchr(name, '.');
1540 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
1541 if (*p != '\0')
1542 jid = 0;
1543 }
1544 sx_xlock(&allprison_lock);
1545 drflags = PD_LIST_XLOCKED;
1546 ppr = mypr;
1547 if (!prison_isalive(ppr)) {
1548 /* This jail is dying. This process will surely follow. */
1549 error = EAGAIN;
1550 goto done_deref;
1551 }
1552 if (flags & JAIL_USE_DESC) {
1553 /* Get the jail from its descriptor. */
1554 error = jaildesc_find(td, jfd_in, &pr, &jdcred);
1555 if (error) {
1556 vfs_opterror(opts, error == ENOENT ?
1557 "descriptor to dead jail" :
1558 "not a jail descriptor");
1559 goto done_deref;
1560 }
1561 drflags |= PD_DEREF;
1562 error = priv_check_cred(jdcred, PRIV_JAIL_SET);
1563 if (error == 0 && (flags & JAIL_ATTACH))
1564 error = priv_check_cred(jdcred, PRIV_JAIL_ATTACH);
1565 crfree(jdcred);
1566 if (error)
1567 goto done_deref;
1568 mtx_lock(&pr->pr_mtx);
1569 drflags |= PD_LOCKED;
1570 if (cuflags == JAIL_CREATE) {
1571 error = EEXIST;
1572 vfs_opterror(opts, "jail %d already exists",
1573 pr->pr_id);
1574 goto done_deref;
1575 }
1576 if (!prison_isalive(pr)) {
1577 /* While a jid can be resurrected, the prison
1578 * itself cannot.
1579 */
1580 error = ENOENT;
1581 vfs_opterror(opts, "jail %d is dying", pr->pr_id);
1582 goto done_deref;
1583 }
1584 if (jid != 0 && jid != pr->pr_id) {
1585 error = EINVAL;
1586 vfs_opterror(opts, "cannot change jid");
1587 goto done_deref;
1588 }
1589 jid = pr->pr_id;
1590 } else if (jid != 0) {
1591 if (jid < 0) {
1592 error = EINVAL;
1593 vfs_opterror(opts, "negative jid");
1594 goto done_deref;
1595 }
1596 /*
1597 * See if a requested jid already exists. Keep track of
1598 * where it can be inserted later.
1599 */
1600 TAILQ_FOREACH(inspr, &allprison, pr_list) {
1601 if (inspr->pr_id < jid)
1602 continue;
1603 if (inspr->pr_id > jid)
1604 break;
1605 if (prison_isalive(inspr)) {
1606 pr = inspr;
1607 mtx_lock(&pr->pr_mtx);
1608 drflags |= PD_LOCKED;
1609 } else {
1610 /* Note a dying jail to handle later. */
1611 deadpr = inspr;
1612 }
1613 inspr = NULL;
1614 break;
1615 }
1616 if (cuflags == JAIL_CREATE && pr != NULL) {
1617 /*
1618 * Even creators that cannot see the jail will
1619 * get EEXIST.
1620 */
1621 error = EEXIST;
1622 vfs_opterror(opts, "jail %d already exists", jid);
1623 goto done_deref;
1624 }
1625 if ((pr == NULL)
1626 ? cuflags == JAIL_UPDATE
1627 : !prison_ischild(mypr, pr)) {
1628 /*
1629 * Updaters get ENOENT for nonexistent jails,
1630 * or for jails they cannot see. The latter
1631 * case is true even for CREATE | UPDATE,
1632 * which normally cannot give this error.
1633 */
1634 error = ENOENT;
1635 vfs_opterror(opts, "jail %d not found", jid);
1636 goto done_deref;
1637 }
1638 }
1639 /*
1640 * If the caller provided a name, look for a jail by that name.
1641 * This has different semantics for creates and updates keyed by jid
1642 * (where the name must not already exist in a different jail),
1643 * and updates keyed by the name itself (where the name must exist
1644 * because that is the jail being updated).
1645 */
1646 namelc = NULL;
1647 if (name != NULL) {
1648 namelc = strrchr(name, '.');
1649 if (namelc == NULL)
1650 namelc = name;
1651 else {
1652 /*
1653 * This is a hierarchical name. Split it into the
1654 * parent and child names, and make sure the parent
1655 * exists or matches an already found jail.
1656 */
1657 if (pr != NULL) {
1658 if (strncmp(name, ppr->pr_name, namelc - name)
1659 || ppr->pr_name[namelc - name] != '\0') {
1660 error = EINVAL;
1661 vfs_opterror(opts,
1662 "cannot change jail's parent");
1663 goto done_deref;
1664 }
1665 } else {
1666 *namelc = '\0';
1667 ppr = prison_find_name(mypr, name);
1668 if (ppr == NULL) {
1669 error = ENOENT;
1670 vfs_opterror(opts,
1671 "jail \"%s\" not found", name);
1672 goto done_deref;
1673 }
1674 mtx_unlock(&ppr->pr_mtx);
1675 if (!prison_isalive(ppr)) {
1676 error = ENOENT;
1677 vfs_opterror(opts,
1678 "jail \"%s\" is dying", name);
1679 goto done_deref;
1680 }
1681 *namelc = '.';
1682 }
1683 namelc++;
1684 }
1685 if (namelc[0] != '\0') {
1686 pnamelen =
1687 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1688 FOREACH_PRISON_CHILD(ppr, tpr) {
1689 if (tpr == pr || !prison_isalive(tpr) ||
1690 strcmp(tpr->pr_name + pnamelen, namelc))
1691 continue;
1692 if (cuflags == JAIL_CREATE || pr != NULL) {
1693 /*
1694 * Create, or update(jid): name must
1695 * not exist in an active sibling jail.
1696 */
1697 error = EEXIST;
1698 vfs_opterror(opts,
1699 "jail \"%s\" already exists", name);
1700 goto done_deref;
1701 }
1702 /* Use this jail for updates. */
1703 pr = tpr;
1704 mtx_lock(&pr->pr_mtx);
1705 drflags |= PD_LOCKED;
1706 break;
1707 }
1708 /*
1709 * Update: name must exist if no jid is specified.
1710 * As with the jid case, the jail must be currently
1711 * visible, or else even CREATE | UPDATE will get
1712 * an error.
1713 */
1714 if ((pr == NULL)
1715 ? cuflags == JAIL_UPDATE
1716 : !prison_isalive(pr)) {
1717 error = ENOENT;
1718 vfs_opterror(opts, "jail \"%s\" not found",
1719 name);
1720 goto done_deref;
1721 }
1722 }
1723 }
1724 /* Update: must provide a desc, jid, or name. */
1725 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1726 error = ENOENT;
1727 vfs_opterror(opts, "update specified no jail");
1728 goto done_deref;
1729 }
1730
1731 /* If there's no prison to update, create a new one and link it in. */
1732 created = pr == NULL;
1733 if (created) {
1734 #ifdef MAC
1735 error = mac_prison_check_create(td->td_ucred, opts, flags);
1736 if (error != 0)
1737 goto done_deref;
1738 #endif
1739 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1740 if (tpr->pr_childcount >= tpr->pr_childmax) {
1741 error = EPERM;
1742 vfs_opterror(opts, "prison limit exceeded");
1743 goto done_deref;
1744 }
1745
1746 if (deadpr != NULL) {
1747 /*
1748 * The prison being created has the same ID as a dying
1749 * one. Handle this by giving the dying jail a new ID.
1750 * This may cause some confusion to user space, but
1751 * only to those listing dying jails.
1752 */
1753 deadid = get_next_deadid(&dinspr);
1754 if (deadid == 0) {
1755 error = EAGAIN;
1756 vfs_opterror(opts, "no available jail IDs");
1757 goto done_deref;
1758 }
1759 mtx_lock(&deadpr->pr_mtx);
1760 deadpr->pr_id = deadid;
1761 mtx_unlock(&deadpr->pr_mtx);
1762 if (dinspr == deadpr)
1763 inspr = deadpr;
1764 else {
1765 inspr = TAILQ_NEXT(deadpr, pr_list);
1766 TAILQ_REMOVE(&allprison, deadpr, pr_list);
1767 if (dinspr != NULL)
1768 TAILQ_INSERT_AFTER(&allprison, dinspr,
1769 deadpr, pr_list);
1770 else
1771 TAILQ_INSERT_HEAD(&allprison, deadpr,
1772 pr_list);
1773 }
1774 }
1775 if (jid == 0 && (jid = get_next_prid(&inspr)) == 0) {
1776 error = EAGAIN;
1777 vfs_opterror(opts, "no available jail IDs");
1778 goto done_deref;
1779 }
1780
1781 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1782 pr->pr_state = PRISON_STATE_INVALID;
1783 refcount_init(&pr->pr_ref, 1);
1784 refcount_init(&pr->pr_uref, 0);
1785 drflags |= PD_DEREF;
1786 LIST_INIT(&pr->pr_children);
1787 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1788 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
1789
1790 pr->pr_id = jid;
1791 if (inspr != NULL)
1792 TAILQ_INSERT_BEFORE(inspr, pr, pr_list);
1793 else
1794 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1795
1796 pr->pr_parent = ppr;
1797 prison_hold(ppr);
1798 prison_proc_hold(ppr);
1799 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1800 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1801 tpr->pr_childcount++;
1802 pr->pr_klist = knlist_alloc(&pr->pr_mtx);
1803
1804 /* Set some default values, and inherit some from the parent. */
1805 if (namelc == NULL)
1806 namelc = "";
1807 if (path == NULL) {
1808 path = "/";
1809 root = mypr->pr_root;
1810 vref(root);
1811 }
1812 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1813 pr->pr_flags |= PR_HOST;
1814 #if defined(INET) || defined(INET6)
1815 #ifdef VIMAGE
1816 if (!(pr_flags & PR_VNET))
1817 #endif
1818 {
1819 #ifdef INET
1820 if (!(ch_flags & PR_IP4_USER))
1821 pr->pr_flags |= PR_IP4 | PR_IP4_USER;
1822 else if (!(pr_flags & PR_IP4_USER)) {
1823 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1824 prison_ip_dup(ppr, pr, PR_INET);
1825 }
1826 #endif
1827 #ifdef INET6
1828 if (!(ch_flags & PR_IP6_USER))
1829 pr->pr_flags |= PR_IP6 | PR_IP6_USER;
1830 else if (!(pr_flags & PR_IP6_USER)) {
1831 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1832 prison_ip_dup(ppr, pr, PR_INET6);
1833 }
1834 #endif
1835 }
1836 #endif
1837 /* Source address selection is always on by default. */
1838 pr->pr_flags |= _PR_IP_SADDRSEL;
1839
1840 pr->pr_securelevel = ppr->pr_securelevel;
1841 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1842 pr->pr_enforce_statfs = jail_default_enforce_statfs;
1843 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
1844
1845 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate;
1846 if (osrelstr == NULL)
1847 strlcpy(pr->pr_osrelease, ppr->pr_osrelease,
1848 sizeof(pr->pr_osrelease));
1849 else
1850 strlcpy(pr->pr_osrelease, osrelstr,
1851 sizeof(pr->pr_osrelease));
1852
1853 #ifdef VIMAGE
1854 /*
1855 * Allocate a new vnet if specified.
1856 *
1857 * Set PR_VNET now if so, so that the vnet is disposed of
1858 * properly when the jail is destroyed.
1859 */
1860 if (pr_flags & PR_VNET) {
1861 pr->pr_flags |= PR_VNET;
1862 pr->pr_vnet = vnet_alloc();
1863 } else {
1864 pr->pr_vnet = ppr->pr_vnet;
1865 }
1866 #endif
1867 /*
1868 * Allocate a dedicated cpuset for each jail.
1869 * Unlike other initial settings, this may return an error.
1870 */
1871 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1872 if (error)
1873 goto done_deref;
1874
1875 #ifdef MAC
1876 error = mac_prison_init(pr, M_WAITOK);
1877 MPASS(error == 0);
1878
1879 mtx_assert(&pr->pr_mtx, MA_OWNED);
1880 #else
1881 mtx_lock(&pr->pr_mtx);
1882 #endif
1883 drflags |= PD_LOCKED;
1884 } else {
1885 /*
1886 * Grab a reference for existing prisons, to ensure they
1887 * continue to exist for the duration of the call.
1888 */
1889 if (!(drflags & PD_DEREF)) {
1890 prison_hold(pr);
1891 drflags |= PD_DEREF;
1892 }
1893 #ifdef MAC
1894 error = mac_prison_check_set(td->td_ucred, pr, opts, flags);
1895 if (error != 0)
1896 goto done_deref;
1897 #endif
1898 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1899 if ((pr->pr_flags & PR_VNET) &&
1900 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1901 error = EINVAL;
1902 vfs_opterror(opts,
1903 "vnet jails cannot have IP address restrictions");
1904 goto done_deref;
1905 }
1906 #endif
1907 #ifdef INET
1908 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1909 error = EINVAL;
1910 vfs_opterror(opts,
1911 "ip4 cannot be changed after creation");
1912 goto done_deref;
1913 }
1914 #endif
1915 #ifdef INET6
1916 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1917 error = EINVAL;
1918 vfs_opterror(opts,
1919 "ip6 cannot be changed after creation");
1920 goto done_deref;
1921 }
1922 #endif
1923 }
1924
1925 /* Do final error checking before setting anything. */
1926 if (gotslevel) {
1927 if (slevel < ppr->pr_securelevel) {
1928 error = EPERM;
1929 goto done_deref;
1930 }
1931 }
1932 if (gotchildmax) {
1933 if (childmax >= ppr->pr_childmax) {
1934 error = EPERM;
1935 goto done_deref;
1936 }
1937 }
1938 if (gotenforce) {
1939 if (enforce < ppr->pr_enforce_statfs) {
1940 error = EPERM;
1941 goto done_deref;
1942 }
1943 }
1944 if (gotrsnum) {
1945 /*
1946 * devfs_rsnum is a uint16_t
1947 */
1948 if (rsnum < 0 || rsnum > 65535) {
1949 error = EINVAL;
1950 goto done_deref;
1951 }
1952 /*
1953 * Nested jails always inherit parent's devfs ruleset
1954 */
1955 if (jailed(td->td_ucred)) {
1956 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
1957 error = EPERM;
1958 goto done_deref;
1959 } else
1960 rsnum = ppr->pr_devfs_rsnum;
1961 }
1962 }
1963 #ifdef INET
1964 if (ip4s > 0) {
1965 if ((ppr->pr_flags & PR_IP4) &&
1966 !prison_ip_parent_match(ppr->pr_addrs[PR_INET], ip4,
1967 PR_INET)) {
1968 error = EPERM;
1969 goto done_deref;
1970 }
1971 if (!prison_ip_conflict_check(ppr, pr, ip4, PR_INET)) {
1972 error = EADDRINUSE;
1973 vfs_opterror(opts, "IPv4 addresses clash");
1974 goto done_deref;
1975 }
1976 }
1977 #endif
1978 #ifdef INET6
1979 if (ip6s > 0) {
1980 if ((ppr->pr_flags & PR_IP6) &&
1981 !prison_ip_parent_match(ppr->pr_addrs[PR_INET6], ip6,
1982 PR_INET6)) {
1983 error = EPERM;
1984 goto done_deref;
1985 }
1986 if (!prison_ip_conflict_check(ppr, pr, ip6, PR_INET6)) {
1987 error = EADDRINUSE;
1988 vfs_opterror(opts, "IPv6 addresses clash");
1989 goto done_deref;
1990 }
1991 }
1992 #endif
1993 onamelen = namelen = 0;
1994 if (namelc != NULL) {
1995 /* Give a default name of the jid. Also allow the name to be
1996 * explicitly the jid - but not any other number, and only in
1997 * normal form (no leading zero/etc).
1998 */
1999 if (namelc[0] == '\0')
2000 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid);
2001 else if ((strtoul(namelc, &p, 10) != jid ||
2002 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') {
2003 error = EINVAL;
2004 vfs_opterror(opts,
2005 "name cannot be numeric (unless it is the jid)");
2006 goto done_deref;
2007 }
2008 /*
2009 * Make sure the name isn't too long for the prison or its
2010 * children.
2011 */
2012 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
2013 onamelen = strlen(pr->pr_name + pnamelen);
2014 namelen = strlen(namelc);
2015 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) {
2016 error = ENAMETOOLONG;
2017 goto done_deref;
2018 }
2019 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
2020 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
2021 sizeof(pr->pr_name)) {
2022 error = ENAMETOOLONG;
2023 goto done_deref;
2024 }
2025 }
2026 }
2027 pr_allow_diff = pr_allow & ~ppr->pr_allow;
2028 if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) {
2029 error = EPERM;
2030 goto done_deref;
2031 }
2032
2033 /*
2034 * Let modules check their parameters. This requires unlocking and
2035 * then re-locking the prison, but this is still a valid state as long
2036 * as allprison_lock remains xlocked.
2037 */
2038 mtx_unlock(&pr->pr_mtx);
2039 drflags &= ~PD_LOCKED;
2040 error = osd_jail_call(pr, PR_METHOD_CHECK, opts);
2041 if (error != 0)
2042 goto done_deref;
2043 mtx_lock(&pr->pr_mtx);
2044 drflags |= PD_LOCKED;
2045
2046 /* At this point, all valid parameters should have been noted. */
2047 TAILQ_FOREACH(opt, opts, link) {
2048 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2049 error = EINVAL;
2050 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2051 goto done_deref;
2052 }
2053 }
2054 maybe_changed = true;
2055
2056 /* Set the parameters of the prison. */
2057 #ifdef INET
2058 redo_ip4 = false;
2059 if (pr_flags & PR_IP4_USER) {
2060 pr->pr_flags |= PR_IP4;
2061 prison_ip_set(pr, PR_INET, ip4);
2062 ip4 = NULL;
2063 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2064 #ifdef VIMAGE
2065 if (tpr->pr_flags & PR_VNET) {
2066 descend = 0;
2067 continue;
2068 }
2069 #endif
2070 if (!prison_ip_restrict(tpr, PR_INET, NULL)) {
2071 redo_ip4 = true;
2072 descend = 0;
2073 }
2074 }
2075 }
2076 #endif
2077 #ifdef INET6
2078 redo_ip6 = false;
2079 if (pr_flags & PR_IP6_USER) {
2080 pr->pr_flags |= PR_IP6;
2081 prison_ip_set(pr, PR_INET6, ip6);
2082 ip6 = NULL;
2083 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2084 #ifdef VIMAGE
2085 if (tpr->pr_flags & PR_VNET) {
2086 descend = 0;
2087 continue;
2088 }
2089 #endif
2090 if (!prison_ip_restrict(tpr, PR_INET6, NULL)) {
2091 redo_ip6 = true;
2092 descend = 0;
2093 }
2094 }
2095 }
2096 #endif
2097 if (gotslevel) {
2098 pr->pr_securelevel = slevel;
2099 /* Set all child jails to be at least this level. */
2100 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
2101 if (tpr->pr_securelevel < slevel)
2102 tpr->pr_securelevel = slevel;
2103 }
2104 if (gotchildmax) {
2105 pr->pr_childmax = childmax;
2106 /* Set all child jails to under this limit. */
2107 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
2108 if (tpr->pr_childmax > childmax - level)
2109 tpr->pr_childmax = childmax > level
2110 ? childmax - level : 0;
2111 }
2112 if (gotenforce) {
2113 pr->pr_enforce_statfs = enforce;
2114 /* Pass this restriction on to the children. */
2115 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
2116 if (tpr->pr_enforce_statfs < enforce)
2117 tpr->pr_enforce_statfs = enforce;
2118 }
2119 if (gotrsnum) {
2120 pr->pr_devfs_rsnum = rsnum;
2121 /* Pass this restriction on to the children. */
2122 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
2123 tpr->pr_devfs_rsnum = rsnum;
2124 }
2125 if (namelc != NULL) {
2126 if (ppr == &prison0)
2127 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name));
2128 else
2129 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
2130 ppr->pr_name, namelc);
2131 /* Change this component of child names. */
2132 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2133 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
2134 strlen(tpr->pr_name + onamelen) + 1);
2135 bcopy(pr->pr_name, tpr->pr_name, namelen);
2136 }
2137 }
2138 if (path != NULL) {
2139 /* Try to keep a real-rooted full pathname. */
2140 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
2141 pr->pr_root = root;
2142 root = NULL;
2143 }
2144 if (PR_HOST & ch_flags & ~pr_flags) {
2145 if (pr->pr_flags & PR_HOST) {
2146 /*
2147 * Copy the parent's host info. As with pr_ip4 above,
2148 * the lack of a lock on the parent is not a problem;
2149 * it is always set with allprison_lock at least
2150 * shared, and is held exclusively here.
2151 */
2152 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
2153 sizeof(pr->pr_hostname));
2154 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
2155 sizeof(pr->pr_domainname));
2156 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
2157 sizeof(pr->pr_hostuuid));
2158 pr->pr_hostid = pr->pr_parent->pr_hostid;
2159 }
2160 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
2161 /* Set this prison, and any descendants without PR_HOST. */
2162 if (host != NULL)
2163 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
2164 if (domain != NULL)
2165 strlcpy(pr->pr_domainname, domain,
2166 sizeof(pr->pr_domainname));
2167 if (uuid != NULL)
2168 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
2169 if (gothid)
2170 pr->pr_hostid = hid;
2171 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2172 if (tpr->pr_flags & PR_HOST)
2173 descend = 0;
2174 else {
2175 if (host != NULL)
2176 strlcpy(tpr->pr_hostname,
2177 pr->pr_hostname,
2178 sizeof(tpr->pr_hostname));
2179 if (domain != NULL)
2180 strlcpy(tpr->pr_domainname,
2181 pr->pr_domainname,
2182 sizeof(tpr->pr_domainname));
2183 if (uuid != NULL)
2184 strlcpy(tpr->pr_hostuuid,
2185 pr->pr_hostuuid,
2186 sizeof(tpr->pr_hostuuid));
2187 if (gothid)
2188 tpr->pr_hostid = hid;
2189 }
2190 }
2191 }
2192 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
2193 if ((tallow = ch_allow & ~pr_allow))
2194 prison_set_allow_locked(pr, tallow, 0);
2195 /*
2196 * Persistent prisons get an extra reference, and prisons losing their
2197 * persist flag lose that reference.
2198 */
2199 if (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags)) {
2200 if (pr_flags & PR_PERSIST) {
2201 prison_hold(pr);
2202 /*
2203 * This may be a new prison's first user reference,
2204 * but wait to call it alive until after OSD calls
2205 * have had a chance to run (and perhaps to fail).
2206 */
2207 refcount_acquire(&pr->pr_uref);
2208 } else {
2209 drflags |= PD_DEUREF;
2210 prison_free_not_last(pr);
2211 }
2212 }
2213 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
2214
2215 #ifdef MAC
2216 /* Apply any request MAC label before we let modules do their work. */
2217 if (gotmaclabel) {
2218 error = mac_set_prison_core(td, pr, mac_set_prison_data);
2219 if (error) {
2220 vfs_opterror(opts, "mac relabel denied");
2221 goto done_deref;
2222 }
2223 }
2224 #endif
2225 mtx_unlock(&pr->pr_mtx);
2226 drflags &= ~PD_LOCKED;
2227 /*
2228 * Any errors past this point will need to de-persist newly created
2229 * prisons, as well as call remove methods.
2230 */
2231 if (created)
2232 drflags |= PD_KILL;
2233
2234 #ifdef RACCT
2235 if (racct_enable && created)
2236 prison_racct_attach(pr);
2237 #endif
2238
2239 /* Locks may have prevented a complete restriction of child IP
2240 * addresses. If so, allocate some more memory and try again.
2241 */
2242 #ifdef INET
2243 while (redo_ip4) {
2244 ip4s = pr->pr_addrs[PR_INET]->ips;
2245 MPASS(ip4 == NULL);
2246 ip4 = prison_ip_alloc(PR_INET, ip4s, M_WAITOK);
2247 mtx_lock(&pr->pr_mtx);
2248 redo_ip4 = false;
2249 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2250 #ifdef VIMAGE
2251 if (tpr->pr_flags & PR_VNET) {
2252 descend = 0;
2253 continue;
2254 }
2255 #endif
2256 if (!prison_ip_restrict(tpr, PR_INET, &ip4))
2257 redo_ip4 = true;
2258 }
2259 mtx_unlock(&pr->pr_mtx);
2260 }
2261 #endif
2262 #ifdef INET6
2263 while (redo_ip6) {
2264 ip6s = pr->pr_addrs[PR_INET6]->ips;
2265 MPASS(ip6 == NULL);
2266 ip6 = prison_ip_alloc(PR_INET6, ip6s, M_WAITOK);
2267 mtx_lock(&pr->pr_mtx);
2268 redo_ip6 = false;
2269 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2270 #ifdef VIMAGE
2271 if (tpr->pr_flags & PR_VNET) {
2272 descend = 0;
2273 continue;
2274 }
2275 #endif
2276 if (!prison_ip_restrict(tpr, PR_INET6, &ip6))
2277 redo_ip6 = true;
2278 }
2279 mtx_unlock(&pr->pr_mtx);
2280 }
2281 #endif
2282
2283 /* Let the modules do their work. */
2284 if (created) {
2285 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
2286 if (error)
2287 goto done_deref;
2288 }
2289 error = osd_jail_call(pr, PR_METHOD_SET, opts);
2290 if (error)
2291 goto done_deref;
2292
2293 /*
2294 * A new prison is now ready to be seen; either it has gained a user
2295 * reference via persistence, or is about to gain one via attachment.
2296 */
2297 if (created) {
2298 sx_assert(&allprison_lock, SX_XLOCKED);
2299 prison_knote(ppr, NOTE_JAIL_CHILD | pr->pr_id);
2300 #ifdef MAC
2301 /*
2302 * Note that mac_prison_created() assumes that it's called in a
2303 * sleepable context.
2304 */
2305 mac_prison_created(td->td_ucred, pr);
2306 #endif
2307 mtx_lock(&pr->pr_mtx);
2308 drflags |= PD_LOCKED;
2309 pr->pr_state = PRISON_STATE_ALIVE;
2310 }
2311
2312 /*
2313 * Attach this process to the prison if requested. This will
2314 * unlock allprison_lock, meaning changes are now user-visible.
2315 */
2316 if (flags & JAIL_ATTACH) {
2317 #ifdef MAC
2318 error = mac_prison_check_attach(td->td_ucred, pr);
2319 if (error != 0) {
2320 vfs_opterror(opts,
2321 "attach operation denied by MAC policy");
2322 goto done_deref;
2323 }
2324 #endif
2325 error = do_jail_attach(td, pr, &drflags);
2326 if (error) {
2327 vfs_opterror(opts, "attach failed");
2328 goto done_deref;
2329 }
2330 }
2331
2332 #ifdef RACCT
2333 if (racct_enable && !created) {
2334 if (drflags & PD_LOCKED) {
2335 mtx_unlock(&pr->pr_mtx);
2336 drflags &= ~PD_LOCKED;
2337 }
2338 if (drflags & PD_LIST_XLOCKED) {
2339 sx_xunlock(&allprison_lock);
2340 drflags &= ~PD_LIST_XLOCKED;
2341 }
2342 prison_racct_modify(pr);
2343 }
2344 #endif
2345
2346 if (created && pr != &prison0 && (pr->pr_allow & PR_ALLOW_NFSD) != 0 &&
2347 (pr->pr_root->v_vflag & VV_ROOT) == 0)
2348 printf("Warning jail jid=%d: mountd/nfsd requires a separate"
2349 " file system\n", pr->pr_id);
2350
2351 /*
2352 * Now that the prison is fully created without error, set the
2353 * jail descriptor if one was requested. This is the only
2354 * parameter that is returned to the caller (except the error
2355 * message).
2356 */
2357 if (jfd_out >= 0) {
2358 if (!(drflags & PD_LOCKED)) {
2359 mtx_lock(&pr->pr_mtx);
2360 drflags |= PD_LOCKED;
2361 }
2362 jfd_pos = 2 * vfs_getopt_pos(opts, "desc") + 1;
2363 if (optuio->uio_segflg == UIO_SYSSPACE)
2364 *(int*)optuio->uio_iov[jfd_pos].iov_base = jfd_out;
2365 else
2366 (void)copyout(&jfd_out,
2367 optuio->uio_iov[jfd_pos].iov_base, sizeof(jfd_out));
2368 jaildesc_set_prison(jfp_out, pr);
2369 }
2370
2371 drflags &= ~PD_KILL;
2372 td->td_retval[0] = pr->pr_id;
2373
2374 done_deref:
2375 /*
2376 * Report changes to kevent. This can happen even if the
2377 * system call fails, as changes might have been made before
2378 * the failure.
2379 */
2380 if (maybe_changed && !created)
2381 prison_knote(pr, NOTE_JAIL_SET);
2382 /* Release any temporary prison holds and/or locks. */
2383 if (pr != NULL)
2384 prison_deref(pr, drflags);
2385 else if (drflags & PD_LIST_SLOCKED)
2386 sx_sunlock(&allprison_lock);
2387 else if (drflags & PD_LIST_XLOCKED)
2388 sx_xunlock(&allprison_lock);
2389 if (root != NULL)
2390 vrele(root);
2391 done_errmsg:
2392 if (error) {
2393 /* Write the error message back to userspace. */
2394 if (vfs_getopt(opts, "errmsg", (void **)&errmsg,
2395 &errmsg_len) == 0 && errmsg_len > 0) {
2396 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
2397 if (optuio->uio_segflg == UIO_SYSSPACE)
2398 bcopy(errmsg,
2399 optuio->uio_iov[errmsg_pos].iov_base,
2400 errmsg_len);
2401 else
2402 (void)copyout(errmsg,
2403 optuio->uio_iov[errmsg_pos].iov_base,
2404 errmsg_len);
2405 }
2406 }
2407 done_free:
2408 /* Clean up other resources. */
2409 #ifdef INET
2410 prison_ip_free(ip4);
2411 #endif
2412 #ifdef INET6
2413 prison_ip_free(ip6);
2414 #endif
2415 #ifdef MAC
2416 if (mac_set_prison_data != NULL)
2417 mac_set_prison_finish(td, error == 0, mac_set_prison_data);
2418 #endif
2419 if (jfp_out != NULL)
2420 fdrop(jfp_out, td);
2421 if (error && jfd_out >= 0)
2422 (void)kern_close(td, jfd_out);
2423 if (g_path != NULL)
2424 free(g_path, M_TEMP);
2425 if (opts != NULL)
2426 vfs_freeopts(opts);
2427 prison_free(mypr);
2428 if (flags & JAIL_ATTACH)
2429 prison_attach_thread_single_end(td);
2430 return (error);
2431 }
2432
2433 /*
2434 * Find the next available prison ID. Return the ID on success, or zero
2435 * on failure. Also set a pointer to the allprison list entry the prison
2436 * should be inserted before.
2437 */
2438 static int
get_next_prid(struct prison ** insprp)2439 get_next_prid(struct prison **insprp)
2440 {
2441 struct prison *inspr;
2442 int jid, maxid;
2443
2444 jid = lastprid % JAIL_MAX + 1;
2445 if (TAILQ_EMPTY(&allprison) ||
2446 TAILQ_LAST(&allprison, prisonlist)->pr_id < jid) {
2447 /*
2448 * A common case is for all jails to be implicitly numbered,
2449 * which means they'll go on the end of the list, at least
2450 * for the first JAIL_MAX times.
2451 */
2452 inspr = NULL;
2453 } else {
2454 /*
2455 * Take two passes through the allprison list: first starting
2456 * with the proposed jid, then ending with it.
2457 */
2458 for (maxid = JAIL_MAX; maxid != 0; ) {
2459 TAILQ_FOREACH(inspr, &allprison, pr_list) {
2460 if (inspr->pr_id < jid)
2461 continue;
2462 if (inspr->pr_id > jid) {
2463 /* Found an opening. */
2464 maxid = 0;
2465 break;
2466 }
2467 if (++jid > maxid) {
2468 if (lastprid == maxid || lastprid == 0)
2469 {
2470 /*
2471 * The entire legal range
2472 * has been traversed
2473 */
2474 return 0;
2475 }
2476 /* Try again from the start. */
2477 jid = 1;
2478 maxid = lastprid;
2479 break;
2480 }
2481 }
2482 if (inspr == NULL) {
2483 /* Found room at the end of the list. */
2484 break;
2485 }
2486 }
2487 }
2488 *insprp = inspr;
2489 lastprid = jid;
2490 return (jid);
2491 }
2492
2493 /*
2494 * Find the next available ID for a renumbered dead prison. This is the same
2495 * as get_next_prid, but counting backward from the end of the range.
2496 */
2497 static int
get_next_deadid(struct prison ** dinsprp)2498 get_next_deadid(struct prison **dinsprp)
2499 {
2500 struct prison *dinspr;
2501 int deadid, minid;
2502
2503 deadid = lastdeadid ? lastdeadid - 1 : JAIL_MAX;
2504 /*
2505 * Take two reverse passes through the allprison list: first
2506 * starting with the proposed deadid, then ending with it.
2507 */
2508 for (minid = 1; minid != 0; ) {
2509 TAILQ_FOREACH_REVERSE(dinspr, &allprison, prisonlist, pr_list) {
2510 if (dinspr->pr_id > deadid)
2511 continue;
2512 if (dinspr->pr_id < deadid) {
2513 /* Found an opening. */
2514 minid = 0;
2515 break;
2516 }
2517 if (--deadid < minid) {
2518 if (lastdeadid == minid || lastdeadid == 0)
2519 {
2520 /*
2521 * The entire legal range
2522 * has been traversed
2523 */
2524 return 0;
2525 }
2526 /* Try again from the end. */
2527 deadid = JAIL_MAX;
2528 minid = lastdeadid;
2529 break;
2530 }
2531 }
2532 if (dinspr == NULL) {
2533 /* Found room at the beginning of the list. */
2534 break;
2535 }
2536 }
2537 *dinsprp = dinspr;
2538 lastdeadid = deadid;
2539 return (deadid);
2540 }
2541
2542 /*
2543 * struct jail_get_args {
2544 * struct iovec *iovp;
2545 * unsigned int iovcnt;
2546 * int flags;
2547 * };
2548 */
2549 int
sys_jail_get(struct thread * td,struct jail_get_args * uap)2550 sys_jail_get(struct thread *td, struct jail_get_args *uap)
2551 {
2552 struct uio *auio;
2553 int error;
2554
2555 /* Check that we have an even number of iovecs. */
2556 if (uap->iovcnt & 1)
2557 return (EINVAL);
2558
2559 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
2560 if (error)
2561 return (error);
2562 error = kern_jail_get(td, auio, uap->flags);
2563 if (error == 0)
2564 error = copyout(auio->uio_iov, uap->iovp,
2565 uap->iovcnt * sizeof(struct iovec));
2566 freeuio(auio);
2567 return (error);
2568 }
2569
2570 int
kern_jail_get(struct thread * td,struct uio * optuio,int flags)2571 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
2572 {
2573 struct bool_flags *bf;
2574 struct file *jfp_out;
2575 struct jailsys_flags *jsf;
2576 struct prison *pr, *mypr;
2577 struct vfsopt *opt;
2578 struct vfsoptlist *opts;
2579 char *errmsg, *name;
2580 int drflags, error, errmsg_len, errmsg_pos, i, jid, len, pos;
2581 int jfd_in, jfd_out;
2582 unsigned f;
2583
2584 if (flags & ~JAIL_GET_MASK)
2585 return (EINVAL);
2586 if ((flags & (JAIL_USE_DESC | JAIL_AT_DESC)) ==
2587 (JAIL_USE_DESC | JAIL_AT_DESC))
2588 return (EINVAL);
2589
2590 /* Get the parameter list. */
2591 error = vfs_buildopts(optuio, &opts);
2592 if (error)
2593 return (error);
2594 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
2595 mypr = td->td_ucred->cr_prison;
2596 prison_hold(mypr);
2597 pr = NULL;
2598 jfp_out = NULL;
2599 jfd_out = -1;
2600
2601 /*
2602 * Find the prison specified by one of: desc, lastjid, jid, name.
2603 */
2604 sx_slock(&allprison_lock);
2605 drflags = PD_LIST_SLOCKED;
2606
2607 error = vfs_copyopt(opts, "desc", &jfd_in, sizeof(jfd_in));
2608 if (error == ENOENT) {
2609 if (flags & (JAIL_AT_DESC | JAIL_GET_DESC | JAIL_OWN_DESC)) {
2610 vfs_opterror(opts, "missing desc");
2611 goto done;
2612 }
2613 } else if (error == 0) {
2614 if (!(flags & (JAIL_USE_DESC | JAIL_AT_DESC | JAIL_GET_DESC |
2615 JAIL_OWN_DESC))) {
2616 error = EINVAL;
2617 vfs_opterror(opts, "unexpected desc");
2618 goto done;
2619 }
2620 if (flags & JAIL_USE_DESC) {
2621 /* Get the jail from its descriptor. */
2622 error = jaildesc_find(td, jfd_in, &pr, NULL);
2623 if (error) {
2624 vfs_opterror(opts, error == ENOENT ?
2625 "descriptor to dead jail" :
2626 "not a jail descriptor");
2627 goto done;
2628 }
2629 drflags |= PD_DEREF;
2630 mtx_lock(&pr->pr_mtx);
2631 drflags |= PD_LOCKED;
2632 goto found_prison;
2633 }
2634 if (flags & JAIL_AT_DESC) {
2635 /* Look up jails based on the descriptor's prison. */
2636 struct prison *jdpr;
2637
2638 error = jaildesc_find(td, jfd_in, &jdpr, NULL);
2639 if (error != 0) {
2640 vfs_opterror(opts, error == ENOENT ?
2641 "descriptor to dead jail" :
2642 "not a jail descriptor");
2643 goto done;
2644 }
2645 prison_free(mypr);
2646 mypr = jdpr;
2647 }
2648 if (flags & (JAIL_GET_DESC | JAIL_OWN_DESC)) {
2649 /* Allocate a jail descriptor to return later. */
2650 error = jaildesc_alloc(td, &jfp_out, &jfd_out,
2651 flags & JAIL_OWN_DESC);
2652 if (error)
2653 goto done;
2654 }
2655 } else
2656 goto done;
2657
2658 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
2659 if (error == 0) {
2660 TAILQ_FOREACH(pr, &allprison, pr_list) {
2661 if (pr->pr_id > jid &&
2662 ((flags & JAIL_DYING) || prison_isalive(pr)) &&
2663 prison_ischild(mypr, pr)) {
2664 mtx_lock(&pr->pr_mtx);
2665 drflags |= PD_LOCKED;
2666 #ifdef MAC
2667 /*
2668 * We special-case this one check because we
2669 * don't want MAC to break jail enumeration. We
2670 * need to just move on to the next accessible
2671 * and alive prison.
2672 */
2673 error = mac_prison_check_get(td->td_ucred, pr,
2674 opts, flags);
2675 if (error != 0) {
2676 mtx_unlock(&pr->pr_mtx);
2677 drflags &= ~PD_LOCKED;
2678 continue;
2679 }
2680
2681 /*
2682 * Avoid potentially expensive trip back into
2683 * the MAC framework.
2684 */
2685 goto found_prison_nomac_alive;
2686 #else
2687 goto found_prison;
2688 #endif
2689 }
2690 }
2691 error = ENOENT;
2692 vfs_opterror(opts, "no jail after %d", jid);
2693 goto done;
2694 } else if (error != ENOENT)
2695 goto done;
2696
2697 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
2698 if (error == 0) {
2699 if (jid != 0) {
2700 pr = prison_find_child(mypr, jid);
2701 if (pr != NULL) {
2702 drflags |= PD_LOCKED;
2703 goto found_prison;
2704 }
2705 error = ENOENT;
2706 vfs_opterror(opts, "jail %d not found", jid);
2707 goto done;
2708 }
2709 } else if (error != ENOENT)
2710 goto done;
2711
2712 error = vfs_getopt(opts, "name", (void **)&name, &len);
2713 if (error == 0) {
2714 if (len == 0 || name[len - 1] != '\0') {
2715 error = EINVAL;
2716 goto done;
2717 }
2718 pr = prison_find_name(mypr, name);
2719 if (pr != NULL) {
2720 drflags |= PD_LOCKED;
2721 goto found_prison;
2722 }
2723 error = ENOENT;
2724 vfs_opterror(opts, "jail \"%s\" not found", name);
2725 goto done;
2726 } else if (error != ENOENT)
2727 goto done;
2728
2729 vfs_opterror(opts, "no jail specified");
2730 error = ENOENT;
2731 goto done;
2732
2733 found_prison:
2734 #ifdef MAC
2735 error = mac_prison_check_get(td->td_ucred, pr, opts, flags);
2736 if (error != 0)
2737 goto done;
2738 #endif
2739 if (!(prison_isalive(pr) || (flags & JAIL_DYING))) {
2740 error = ENOENT;
2741 if (pr->pr_name[0] != '0' && isdigit(pr->pr_name[0])) {
2742 vfs_opterror(opts, "jail %d is dying",
2743 pr->pr_id);
2744 } else {
2745 vfs_opterror(opts, "jail \"%s\" (%d) is dying",
2746 pr->pr_name, pr->pr_id);
2747 }
2748 goto done;
2749 }
2750 #ifdef MAC
2751 found_prison_nomac_alive:
2752 #endif
2753 /* Get the parameters of the prison. */
2754 if (!(drflags & PD_DEREF)) {
2755 prison_hold(pr);
2756 drflags |= PD_DEREF;
2757 }
2758 td->td_retval[0] = pr->pr_id;
2759 if (jfd_out >= 0) {
2760 error = vfs_setopt(opts, "desc", &jfd_out, sizeof(jfd_out));
2761 if (error != 0 && error != ENOENT)
2762 goto done;
2763 jaildesc_set_prison(jfp_out, pr);
2764 }
2765 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
2766 if (error != 0 && error != ENOENT)
2767 goto done;
2768 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
2769 error = vfs_setopt(opts, "parent", &i, sizeof(i));
2770 if (error != 0 && error != ENOENT)
2771 goto done;
2772 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
2773 if (error != 0 && error != ENOENT)
2774 goto done;
2775 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
2776 sizeof(pr->pr_cpuset->cs_id));
2777 if (error != 0 && error != ENOENT)
2778 goto done;
2779 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
2780 if (error != 0 && error != ENOENT)
2781 goto done;
2782 #ifdef INET
2783 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_addrs[PR_INET]->pr_ip,
2784 pr->pr_addrs[PR_INET] ? pr->pr_addrs[PR_INET]->ips *
2785 pr_families[PR_INET].size : 0 );
2786 if (error != 0 && error != ENOENT)
2787 goto done;
2788 #endif
2789 #ifdef INET6
2790 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_addrs[PR_INET6]->pr_ip,
2791 pr->pr_addrs[PR_INET6] ? pr->pr_addrs[PR_INET6]->ips *
2792 pr_families[PR_INET6].size : 0 );
2793 if (error != 0 && error != ENOENT)
2794 goto done;
2795 #endif
2796 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
2797 sizeof(pr->pr_securelevel));
2798 if (error != 0 && error != ENOENT)
2799 goto done;
2800 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
2801 sizeof(pr->pr_childcount));
2802 if (error != 0 && error != ENOENT)
2803 goto done;
2804 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
2805 sizeof(pr->pr_childmax));
2806 if (error != 0 && error != ENOENT)
2807 goto done;
2808 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
2809 if (error != 0 && error != ENOENT)
2810 goto done;
2811 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
2812 if (error != 0 && error != ENOENT)
2813 goto done;
2814 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
2815 if (error != 0 && error != ENOENT)
2816 goto done;
2817 #ifdef COMPAT_FREEBSD32
2818 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
2819 uint32_t hid32 = pr->pr_hostid;
2820
2821 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
2822 } else
2823 #endif
2824 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
2825 sizeof(pr->pr_hostid));
2826 if (error != 0 && error != ENOENT)
2827 goto done;
2828 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
2829 sizeof(pr->pr_enforce_statfs));
2830 if (error != 0 && error != ENOENT)
2831 goto done;
2832 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
2833 sizeof(pr->pr_devfs_rsnum));
2834 if (error != 0 && error != ENOENT)
2835 goto done;
2836 for (bf = pr_flag_bool;
2837 bf < pr_flag_bool + nitems(pr_flag_bool);
2838 bf++) {
2839 i = (pr->pr_flags & bf->flag) ? 1 : 0;
2840 error = vfs_setopt(opts, bf->name, &i, sizeof(i));
2841 if (error != 0 && error != ENOENT)
2842 goto done;
2843 i = !i;
2844 error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
2845 if (error != 0 && error != ENOENT)
2846 goto done;
2847 }
2848 for (jsf = pr_flag_jailsys;
2849 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
2850 jsf++) {
2851 f = pr->pr_flags & (jsf->disable | jsf->new);
2852 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE
2853 : (f == jsf->new) ? JAIL_SYS_NEW
2854 : JAIL_SYS_INHERIT;
2855 error = vfs_setopt(opts, jsf->name, &i, sizeof(i));
2856 if (error != 0 && error != ENOENT)
2857 goto done;
2858 }
2859 for (bf = pr_flag_allow;
2860 bf < pr_flag_allow + nitems(pr_flag_allow) &&
2861 atomic_load_int(&bf->flag) != 0;
2862 bf++) {
2863 i = (pr->pr_allow & bf->flag) ? 1 : 0;
2864 error = vfs_setopt(opts, bf->name, &i, sizeof(i));
2865 if (error != 0 && error != ENOENT)
2866 goto done;
2867 i = !i;
2868 error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
2869 if (error != 0 && error != ENOENT)
2870 goto done;
2871 }
2872 i = !prison_isalive(pr);
2873 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2874 if (error != 0 && error != ENOENT)
2875 goto done;
2876 i = !i;
2877 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2878 if (error != 0 && error != ENOENT)
2879 goto done;
2880 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate,
2881 sizeof(pr->pr_osreldate));
2882 if (error != 0 && error != ENOENT)
2883 goto done;
2884 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease);
2885 if (error != 0 && error != ENOENT)
2886 goto done;
2887
2888 #ifdef MAC
2889 /*
2890 * We get the MAC label last because we'll let the MAC framework drop
2891 * pr_mtx to externalize the label.
2892 */
2893 error = mac_get_prison(td, pr, opts);
2894 mtx_assert(&pr->pr_mtx, MA_NOTOWNED);
2895 drflags &= ~PD_LOCKED;
2896 if (error != 0 && error != ENOENT)
2897 goto done;
2898 #else
2899 mtx_unlock(&pr->pr_mtx);
2900 drflags &= ~PD_LOCKED;
2901 #endif
2902
2903 /* Get the module parameters. */
2904 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2905 if (error)
2906 goto done;
2907 prison_deref(pr, drflags);
2908 pr = NULL;
2909 drflags = 0;
2910
2911 /* By now, all parameters should have been noted. */
2912 TAILQ_FOREACH(opt, opts, link) {
2913 if (!opt->seen &&
2914 (strstr(opt->name, JAIL_META_PRIVATE ".") == opt->name ||
2915 strstr(opt->name, JAIL_META_SHARED ".") == opt->name)) {
2916 /* Communicate back a missing key. */
2917 free(opt->value, M_MOUNT);
2918 opt->value = NULL;
2919 opt->len = 0;
2920 continue;
2921 }
2922 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2923 error = EINVAL;
2924 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2925 goto done;
2926 }
2927 }
2928
2929 /* Write the fetched parameters back to userspace. */
2930 error = 0;
2931 TAILQ_FOREACH(opt, opts, link) {
2932 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2933 pos = 2 * opt->pos + 1;
2934 optuio->uio_iov[pos].iov_len = opt->len;
2935 if (opt->value != NULL) {
2936 if (optuio->uio_segflg == UIO_SYSSPACE) {
2937 bcopy(opt->value,
2938 optuio->uio_iov[pos].iov_base,
2939 opt->len);
2940 } else {
2941 error = copyout(opt->value,
2942 optuio->uio_iov[pos].iov_base,
2943 opt->len);
2944 if (error)
2945 break;
2946 }
2947 }
2948 }
2949 }
2950
2951 done:
2952 /* Release any temporary prison holds and/or locks. */
2953 if (pr != NULL)
2954 prison_deref(pr, drflags);
2955 else if (drflags & PD_LIST_SLOCKED)
2956 sx_sunlock(&allprison_lock);
2957 else if (drflags & PD_LIST_XLOCKED)
2958 sx_xunlock(&allprison_lock);
2959 /* Clean up other resources. */
2960 if (jfp_out != NULL)
2961 (void)fdrop(jfp_out, td);
2962 if (error && jfd_out >= 0)
2963 (void)kern_close(td, jfd_out);
2964 if (error && errmsg_pos >= 0) {
2965 /* Write the error message back to userspace. */
2966 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2967 errmsg_pos = 2 * errmsg_pos + 1;
2968 if (errmsg_len > 0) {
2969 if (optuio->uio_segflg == UIO_SYSSPACE)
2970 bcopy(errmsg,
2971 optuio->uio_iov[errmsg_pos].iov_base,
2972 errmsg_len);
2973 else
2974 (void)copyout(errmsg,
2975 optuio->uio_iov[errmsg_pos].iov_base,
2976 errmsg_len);
2977 }
2978 }
2979 vfs_freeopts(opts);
2980 prison_free(mypr);
2981 return (error);
2982 }
2983
2984 /*
2985 * struct jail_remove_args {
2986 * int jid;
2987 * };
2988 */
2989 int
sys_jail_remove(struct thread * td,struct jail_remove_args * uap)2990 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
2991 {
2992 struct prison *pr;
2993 int error;
2994
2995 error = priv_check(td, PRIV_JAIL_REMOVE);
2996 if (error)
2997 return (error);
2998
2999 sx_xlock(&allprison_lock);
3000 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
3001 if (pr == NULL) {
3002 sx_xunlock(&allprison_lock);
3003 return (EINVAL);
3004 }
3005 #ifdef MAC
3006 error = mac_prison_check_remove(td->td_ucred, pr);
3007 if (error != 0) {
3008 mtx_unlock(&pr->pr_mtx);
3009 sx_xunlock(&allprison_lock);
3010 return (error);
3011 }
3012 #endif
3013 prison_hold(pr);
3014 prison_remove(pr);
3015 return (0);
3016 }
3017
3018 /*
3019 * struct jail_remove_jd_args {
3020 * int fd;
3021 * };
3022 */
3023 int
sys_jail_remove_jd(struct thread * td,struct jail_remove_jd_args * uap)3024 sys_jail_remove_jd(struct thread *td, struct jail_remove_jd_args *uap)
3025 {
3026 struct prison *pr;
3027 struct ucred *jdcred;
3028 int error;
3029
3030 error = jaildesc_find(td, uap->fd, &pr, &jdcred);
3031 if (error)
3032 return (error);
3033 error = priv_check_cred(jdcred, PRIV_JAIL_REMOVE);
3034 crfree(jdcred);
3035 #ifdef MAC
3036 if (error == 0)
3037 error = mac_prison_check_remove(td->td_ucred, pr);
3038 #endif
3039 if (error) {
3040 prison_free(pr);
3041 return (error);
3042 }
3043 sx_xlock(&allprison_lock);
3044 mtx_lock(&pr->pr_mtx);
3045 prison_remove(pr);
3046 return (0);
3047 }
3048
3049 /*
3050 * Begin the removal process for a prison. The allprison lock should
3051 * be held exclusively, and the prison should be both locked and held.
3052 */
3053 void
prison_remove(struct prison * pr)3054 prison_remove(struct prison *pr)
3055 {
3056 sx_assert(&allprison_lock, SA_XLOCKED);
3057 mtx_assert(&pr->pr_mtx, MA_OWNED);
3058 prison_deref(pr, PD_KILL | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
3059 }
3060
3061 /*
3062 * struct jail_attach_args {
3063 * int jid;
3064 * };
3065 */
3066 int
sys_jail_attach(struct thread * td,struct jail_attach_args * uap)3067 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
3068 {
3069 struct prison *pr;
3070 int drflags, error;
3071
3072 error = priv_check(td, PRIV_JAIL_ATTACH);
3073 if (error)
3074 return (error);
3075 /* Only let a single thread in the process try to attach at a time. */
3076 error = prison_attach_thread_single(td);
3077 if (error != 0)
3078 return (error);
3079
3080 sx_slock(&allprison_lock);
3081 drflags = PD_LIST_SLOCKED;
3082 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
3083 if (pr == NULL) {
3084 error = EINVAL;
3085 goto done;
3086 }
3087 drflags |= PD_LOCKED;
3088
3089 #ifdef MAC
3090 error = mac_prison_check_attach(td->td_ucred, pr);
3091 if (error != 0)
3092 goto done;
3093 #endif
3094
3095 /* Do not allow a process to attach to a prison that is not alive. */
3096 if (!prison_isalive(pr)) {
3097 error = EINVAL;
3098 goto done;
3099 }
3100
3101 error = do_jail_attach(td, pr, &drflags);
3102
3103 done:
3104 prison_deref(pr, drflags);
3105 prison_attach_thread_single_end(td);
3106 return (error);
3107 }
3108
3109 /*
3110 * struct jail_attach_jd_args {
3111 * int fd;
3112 * };
3113 */
3114 int
sys_jail_attach_jd(struct thread * td,struct jail_attach_jd_args * uap)3115 sys_jail_attach_jd(struct thread *td, struct jail_attach_jd_args *uap)
3116 {
3117 struct prison *pr;
3118 struct ucred *jdcred;
3119 int drflags, error;
3120
3121 /* Only let a single thread in the process try to attach at a time. */
3122 error = prison_attach_thread_single(td);
3123 if (error != 0)
3124 return (error);
3125
3126 sx_slock(&allprison_lock);
3127 drflags = PD_LIST_SLOCKED;
3128 pr = NULL;
3129 error = jaildesc_find(td, uap->fd, &pr, &jdcred);
3130 if (error)
3131 goto done;
3132 drflags |= PD_DEREF;
3133 error = priv_check_cred(jdcred, PRIV_JAIL_ATTACH);
3134 #ifdef MAC
3135 if (error == 0)
3136 error = mac_prison_check_attach(td->td_ucred, pr);
3137 #endif
3138 crfree(jdcred);
3139 if (error)
3140 goto done;
3141
3142 /* Do not allow a process to attach to a prison that is not alive. */
3143 if (!prison_isalive(pr)) {
3144 error = EINVAL;
3145 goto done;
3146 }
3147
3148 error = do_jail_attach(td, pr, &drflags);
3149
3150 done:
3151 prison_deref(pr, drflags);
3152 prison_attach_thread_single_end(td);
3153 return (error);
3154 }
3155
3156 /*
3157 * Attach the current process to a prison. On entry, the allprison
3158 * lock should be at least shared. On exit, both it and the prison
3159 * itself will be unlocked, which will be refelected in *drflagsp.
3160 */
3161 static int
do_jail_attach(struct thread * td,struct prison * pr,int * drflagsp)3162 do_jail_attach(struct thread *td, struct prison *pr, int *drflagsp)
3163 {
3164 struct proc *p;
3165 struct ucred *newcred, *oldcred;
3166 int drflags, error;
3167
3168 sx_assert(&allprison_lock, SX_LOCKED);
3169 KASSERT(prison_isvalid(pr), ("Attaching to invalid prison %p", pr));
3170 /*
3171 * Note the caller's locking state, but gain and track our own
3172 * references. The caller will see that locks have been
3173 * dropped (which isn't true now, but will be after OSD calls).
3174 */
3175 prison_hold(pr);
3176 refcount_acquire(&pr->pr_uref);
3177 drflags = PD_DEREF | PD_DEUREF | (*drflagsp & PD_LOCK_FLAGS);
3178 *drflagsp &= PD_OP_FLAGS;
3179
3180 /* Let modules do whatever they need to prepare for attaching. */
3181 if (drflags & PD_LOCKED) {
3182 mtx_unlock(&pr->pr_mtx);
3183 drflags &= ~PD_LOCKED;
3184 }
3185 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
3186 if (error)
3187 goto e_revert_osd;
3188 sx_unlock(&allprison_lock);
3189 drflags &= ~(PD_LIST_SLOCKED | PD_LIST_XLOCKED);
3190
3191 /*
3192 * Reparent the newly attached process to this jail.
3193 */
3194 p = td->td_proc;
3195 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
3196 if (error)
3197 goto e_revert_osd;
3198
3199 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
3200 if ((error = change_dir(pr->pr_root, td)) != 0)
3201 goto e_unlock;
3202 #ifdef MAC
3203 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
3204 goto e_unlock;
3205 #endif
3206 VOP_UNLOCK(pr->pr_root);
3207 if ((error = pwd_chroot_chdir(td, pr->pr_root)))
3208 goto e_revert_osd;
3209
3210 newcred = crget();
3211 PROC_LOCK(p);
3212 oldcred = crcopysafe(p, newcred);
3213 newcred->cr_prison = pr;
3214 #ifdef RACCT
3215 racct_proc_ucred_changed(p, oldcred, newcred);
3216 #endif
3217 #ifdef RCTL
3218 crhold(newcred);
3219 #endif
3220 /*
3221 * Takes over 'newcred''s reference, so 'newcred' must not be used
3222 * besides this point except on RCTL where we took an additional
3223 * reference above.
3224 */
3225 proc_set_cred(p, newcred);
3226 setsugid(p);
3227 PROC_UNLOCK(p);
3228 #ifdef RCTL
3229 rctl_proc_ucred_changed(p, newcred);
3230 crfree(newcred);
3231 #endif
3232 prison_proc_relink(oldcred->cr_prison, pr, p);
3233 prison_deref(oldcred->cr_prison, drflags);
3234 crfree(oldcred);
3235 prison_knote(pr, NOTE_JAIL_ATTACH | td->td_proc->p_pid);
3236 #ifdef MAC
3237 /*
3238 * Note that mac_prison_attached() assumes that it's called in a
3239 * sleepable context.
3240 */
3241 mac_prison_attached(td->td_ucred, pr, td->td_proc);
3242 #endif
3243
3244 /*
3245 * If the prison was killed while changing credentials, die along
3246 * with it.
3247 */
3248 if (!prison_isalive(pr)) {
3249 PROC_LOCK(p);
3250 kern_psignal(p, SIGKILL);
3251 PROC_UNLOCK(p);
3252 }
3253
3254 return (0);
3255
3256 e_unlock:
3257 VOP_UNLOCK(pr->pr_root);
3258 e_revert_osd:
3259 /* Tell modules this process is still in its old jail after all. */
3260 if (!(drflags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) {
3261 sx_slock(&allprison_lock);
3262 drflags |= PD_LIST_SLOCKED;
3263 }
3264 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td);
3265 prison_deref(pr, drflags);
3266 return (error);
3267 }
3268
3269 /*
3270 * Only one thread in a process should try to attach to a jail, or
3271 * they might end up with a process root from one prison, but attached
3272 * to the jail of another. Enforce this by making the process run in
3273 * single-threaded mode for the duration of the system call, which
3274 * also prevents other related calls such as chroot.
3275 */
3276 static int
prison_attach_thread_single(struct thread * td)3277 prison_attach_thread_single(struct thread *td)
3278 {
3279 struct proc *p;
3280 int error;
3281
3282 error = 0;
3283 p = td->td_proc;
3284 if ((atomic_load_int(&p->p_flag) & P_HADTHREADS) != 0) {
3285 PROC_LOCK(p);
3286 if (thread_single(p, SINGLE_BOUNDARY))
3287 error = ERESTART;
3288 PROC_UNLOCK(p);
3289 }
3290 return (error);
3291 }
3292
3293 static void
prison_attach_thread_single_end(struct thread * td)3294 prison_attach_thread_single_end(struct thread *td)
3295 {
3296 struct proc *p;
3297
3298 p = td->td_proc;
3299 if ((atomic_load_int(&p->p_flag) & P_HADTHREADS) != 0) {
3300 PROC_LOCK(p);
3301 thread_single_end(p, SINGLE_BOUNDARY);
3302 PROC_UNLOCK(p);
3303 }
3304 }
3305
3306 /*
3307 * Returns a locked prison instance, or NULL on failure.
3308 */
3309 struct prison *
prison_find(int prid)3310 prison_find(int prid)
3311 {
3312 struct prison *pr;
3313
3314 sx_assert(&allprison_lock, SX_LOCKED);
3315 TAILQ_FOREACH(pr, &allprison, pr_list) {
3316 if (pr->pr_id < prid)
3317 continue;
3318 if (pr->pr_id > prid)
3319 break;
3320 KASSERT(prison_isvalid(pr), ("Found invalid prison %p", pr));
3321 mtx_lock(&pr->pr_mtx);
3322 return (pr);
3323 }
3324 return (NULL);
3325 }
3326
3327 /*
3328 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
3329 */
3330 struct prison *
prison_find_child(struct prison * mypr,int prid)3331 prison_find_child(struct prison *mypr, int prid)
3332 {
3333 struct prison *pr;
3334 int descend;
3335
3336 sx_assert(&allprison_lock, SX_LOCKED);
3337 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
3338 if (pr->pr_id == prid) {
3339 KASSERT(prison_isvalid(pr),
3340 ("Found invalid prison %p", pr));
3341 mtx_lock(&pr->pr_mtx);
3342 return (pr);
3343 }
3344 }
3345 return (NULL);
3346 }
3347
3348 /*
3349 * Look for the name relative to mypr. Returns a locked prison or NULL.
3350 */
3351 struct prison *
prison_find_name(struct prison * mypr,const char * name)3352 prison_find_name(struct prison *mypr, const char *name)
3353 {
3354 struct prison *pr, *deadpr;
3355 size_t mylen;
3356 int descend;
3357
3358 sx_assert(&allprison_lock, SX_LOCKED);
3359 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
3360 deadpr = NULL;
3361 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
3362 if (!strcmp(pr->pr_name + mylen, name)) {
3363 KASSERT(prison_isvalid(pr),
3364 ("Found invalid prison %p", pr));
3365 if (prison_isalive(pr)) {
3366 mtx_lock(&pr->pr_mtx);
3367 return (pr);
3368 }
3369 deadpr = pr;
3370 }
3371 }
3372 /* There was no valid prison - perhaps there was a dying one. */
3373 if (deadpr != NULL)
3374 mtx_lock(&deadpr->pr_mtx);
3375 return (deadpr);
3376 }
3377
3378 /*
3379 * See if a prison has the specific flag set. The prison should be locked,
3380 * unless checking for flags that are only set at jail creation (such as
3381 * PR_IP4 and PR_IP6), or only the single bit is examined, without regard
3382 * to any other prison data.
3383 */
3384 bool
prison_flag(struct ucred * cred,unsigned flag)3385 prison_flag(struct ucred *cred, unsigned flag)
3386 {
3387
3388 return ((cred->cr_prison->pr_flags & flag) != 0);
3389 }
3390
3391 /*
3392 * See if a prison has the specific allow flag set.
3393 * The prison *should* be locked, or only a single bit is examined, without
3394 * regard to any other prison data.
3395 */
3396 bool
prison_allow(struct ucred * cred,unsigned flag)3397 prison_allow(struct ucred *cred, unsigned flag)
3398 {
3399
3400 return ((cred->cr_prison->pr_allow & flag) != 0);
3401 }
3402
3403 /*
3404 * Hold a prison reference, by incrementing pr_ref. It is generally
3405 * an error to hold a prison that does not already have a reference.
3406 * A prison record will remain valid as long as it has at least one
3407 * reference, and will not be removed as long as either the prison
3408 * mutex or the allprison lock is held (allprison_lock may be shared).
3409 */
3410 void
prison_hold_locked(struct prison * pr)3411 prison_hold_locked(struct prison *pr)
3412 {
3413
3414 /* Locking is no longer required. */
3415 prison_hold(pr);
3416 }
3417
3418 void
prison_hold(struct prison * pr)3419 prison_hold(struct prison *pr)
3420 {
3421 #ifdef INVARIANTS
3422 int was_valid = refcount_acquire_if_not_zero(&pr->pr_ref);
3423
3424 KASSERT(was_valid,
3425 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id));
3426 #else
3427 refcount_acquire(&pr->pr_ref);
3428 #endif
3429 }
3430
3431 /*
3432 * Remove a prison reference. If that was the last reference, the
3433 * prison will be removed (at a later time).
3434 */
3435 void
prison_free_locked(struct prison * pr)3436 prison_free_locked(struct prison *pr)
3437 {
3438
3439 mtx_assert(&pr->pr_mtx, MA_OWNED);
3440 /*
3441 * Locking is no longer required, but unlock because the caller
3442 * expects it.
3443 */
3444 mtx_unlock(&pr->pr_mtx);
3445 prison_free(pr);
3446 }
3447
3448 void
prison_free(struct prison * pr)3449 prison_free(struct prison *pr)
3450 {
3451
3452 KASSERT(refcount_load(&pr->pr_ref) > 0,
3453 ("Trying to free dead prison %p (jid=%d).",
3454 pr, pr->pr_id));
3455 if (!refcount_release_if_not_last(&pr->pr_ref)) {
3456 /*
3457 * Don't remove the last reference in this context,
3458 * in case there are locks held.
3459 */
3460 taskqueue_enqueue(taskqueue_jail_remove, &pr->pr_task);
3461 }
3462 }
3463
3464 static void
prison_free_not_last(struct prison * pr)3465 prison_free_not_last(struct prison *pr)
3466 {
3467 #ifdef INVARIANTS
3468 int lastref;
3469
3470 KASSERT(refcount_load(&pr->pr_ref) > 0,
3471 ("Trying to free dead prison %p (jid=%d).",
3472 pr, pr->pr_id));
3473 lastref = refcount_release(&pr->pr_ref);
3474 KASSERT(!lastref,
3475 ("prison_free_not_last freed last ref on prison %p (jid=%d).",
3476 pr, pr->pr_id));
3477 #else
3478 refcount_release(&pr->pr_ref);
3479 #endif
3480 }
3481
3482 /*
3483 * Hold a prison for user visibility, by incrementing pr_uref.
3484 * It is generally an error to hold a prison that isn't already
3485 * user-visible, except through the jail system calls. It is also
3486 * an error to hold an invalid prison. A prison record will remain
3487 * alive as long as it has at least one user reference, and will not
3488 * be set to the dying state until the prison mutex and allprison_lock
3489 * are both freed.
3490 */
3491 void
prison_proc_hold(struct prison * pr)3492 prison_proc_hold(struct prison *pr)
3493 {
3494 #ifdef INVARIANTS
3495 int was_alive = refcount_acquire_if_not_zero(&pr->pr_uref);
3496
3497 KASSERT(was_alive,
3498 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
3499 #else
3500 refcount_acquire(&pr->pr_uref);
3501 #endif
3502 }
3503
3504 /*
3505 * Remove a prison user reference. If it was the last reference, the
3506 * prison will be considered "dying", and may be removed once all of
3507 * its references are dropped.
3508 */
3509 void
prison_proc_free(struct prison * pr)3510 prison_proc_free(struct prison *pr)
3511 {
3512
3513 /*
3514 * Locking is only required when releasing the last reference.
3515 * This allows assurance that a locked prison will remain alive
3516 * until it is unlocked.
3517 */
3518 KASSERT(refcount_load(&pr->pr_uref) > 0,
3519 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
3520 if (!refcount_release_if_not_last(&pr->pr_uref)) {
3521 /*
3522 * Don't remove the last user reference in this context,
3523 * which is expected to be a process that is not only locked,
3524 * but also half dead. Add a reference so any calls to
3525 * prison_free() won't re-submit the task.
3526 */
3527 prison_hold(pr);
3528 mtx_lock(&pr->pr_mtx);
3529 KASSERT(!(pr->pr_flags & PR_COMPLETE_PROC),
3530 ("Redundant last reference in prison_proc_free (jid=%d)",
3531 pr->pr_id));
3532 pr->pr_flags |= PR_COMPLETE_PROC;
3533 mtx_unlock(&pr->pr_mtx);
3534 taskqueue_enqueue(taskqueue_jail_remove, &pr->pr_task);
3535 }
3536 }
3537
3538 static void
prison_proc_free_not_last(struct prison * pr)3539 prison_proc_free_not_last(struct prison *pr)
3540 {
3541 #ifdef INVARIANTS
3542 int lastref;
3543
3544 KASSERT(refcount_load(&pr->pr_uref) > 0,
3545 ("Trying to free dead prison %p (jid=%d).",
3546 pr, pr->pr_id));
3547 lastref = refcount_release(&pr->pr_uref);
3548 KASSERT(!lastref,
3549 ("prison_proc_free_not_last freed last uref on prison %p (jid=%d).",
3550 pr, pr->pr_id));
3551 #else
3552 refcount_release(&pr->pr_uref);
3553 #endif
3554 }
3555
3556 void
prison_proc_link(struct prison * pr,struct proc * p)3557 prison_proc_link(struct prison *pr, struct proc *p)
3558 {
3559
3560 sx_assert(&allproc_lock, SA_XLOCKED);
3561 LIST_INSERT_HEAD(&pr->pr_proclist, p, p_jaillist);
3562 }
3563
3564 void
prison_proc_unlink(struct prison * pr,struct proc * p)3565 prison_proc_unlink(struct prison *pr, struct proc *p)
3566 {
3567
3568 sx_assert(&allproc_lock, SA_XLOCKED);
3569 LIST_REMOVE(p, p_jaillist);
3570 }
3571
3572 static void
prison_proc_relink(struct prison * opr,struct prison * npr,struct proc * p)3573 prison_proc_relink(struct prison *opr, struct prison *npr, struct proc *p)
3574 {
3575
3576 sx_xlock(&allproc_lock);
3577 prison_proc_unlink(opr, p);
3578 prison_proc_link(npr, p);
3579 sx_xunlock(&allproc_lock);
3580 }
3581
3582 /*
3583 * Complete a call to either prison_free or prison_proc_free.
3584 */
3585 static void
prison_complete(void * context,int pending)3586 prison_complete(void *context, int pending)
3587 {
3588 struct prison *pr = context;
3589 int drflags;
3590
3591 /*
3592 * This could be called to release the last reference, or the last
3593 * user reference (plus the reference held in prison_proc_free).
3594 */
3595 drflags = prison_lock_xlock(pr, PD_DEREF);
3596 if (pr->pr_flags & PR_COMPLETE_PROC) {
3597 pr->pr_flags &= ~PR_COMPLETE_PROC;
3598 drflags |= PD_DEUREF;
3599 }
3600 prison_deref(pr, drflags);
3601 }
3602
3603 static void
prison_kill_processes_cb(struct proc * p,void * arg __unused)3604 prison_kill_processes_cb(struct proc *p, void *arg __unused)
3605 {
3606
3607 kern_psignal(p, SIGKILL);
3608 }
3609
3610 /*
3611 * Note the iteration does not guarantee acting on all processes.
3612 * Most notably there may be fork or jail_attach in progress.
3613 */
3614 void
prison_proc_iterate(struct prison * pr,void (* cb)(struct proc *,void *),void * cbarg)3615 prison_proc_iterate(struct prison *pr, void (*cb)(struct proc *, void *),
3616 void *cbarg)
3617 {
3618 struct prison *ppr;
3619 struct proc *p;
3620
3621 if (atomic_load_int(&pr->pr_childcount) == 0) {
3622 sx_slock(&allproc_lock);
3623 LIST_FOREACH(p, &pr->pr_proclist, p_jaillist) {
3624 if (p->p_state == PRS_NEW)
3625 continue;
3626 PROC_LOCK(p);
3627 cb(p, cbarg);
3628 PROC_UNLOCK(p);
3629 }
3630 sx_sunlock(&allproc_lock);
3631 if (atomic_load_int(&pr->pr_childcount) == 0)
3632 return;
3633 /*
3634 * Some jails popped up during the iteration, fall through to a
3635 * system-wide search.
3636 */
3637 }
3638
3639 sx_slock(&allproc_lock);
3640 FOREACH_PROC_IN_SYSTEM(p) {
3641 PROC_LOCK(p);
3642 if (p->p_state != PRS_NEW && p->p_ucred != NULL) {
3643 for (ppr = p->p_ucred->cr_prison; ppr != NULL;
3644 ppr = ppr->pr_parent) {
3645 if (ppr == pr) {
3646 cb(p, cbarg);
3647 break;
3648 }
3649 }
3650 }
3651 PROC_UNLOCK(p);
3652 }
3653 sx_sunlock(&allproc_lock);
3654 }
3655
3656 /*
3657 * Remove a prison reference and/or user reference (usually).
3658 * This assumes context that allows sleeping (for allprison_lock),
3659 * with no non-sleeping locks held, except perhaps the prison itself.
3660 * If there are no more references, release and delist the prison.
3661 * On completion, the prison lock and the allprison lock are both
3662 * unlocked.
3663 */
3664 static void
prison_deref(struct prison * pr,int flags)3665 prison_deref(struct prison *pr, int flags)
3666 {
3667 struct prisonlist freeprison;
3668 struct prison *killpr, *rpr, *ppr, *tpr;
3669
3670 killpr = NULL;
3671 TAILQ_INIT(&freeprison);
3672 /*
3673 * Release this prison as requested, which may cause its parent
3674 * to be released, and then maybe its grandparent, etc.
3675 */
3676 for (;;) {
3677 if (flags & PD_KILL) {
3678 /* Kill the prison and its descendents. */
3679 KASSERT(pr != &prison0,
3680 ("prison_deref trying to kill prison0"));
3681 if (!prison_isalive(pr)) {
3682 /* Silently ignore already-dying prisons. */
3683 flags &= ~PD_KILL;
3684 } else {
3685 if (!(flags & PD_DEREF)) {
3686 prison_hold(pr);
3687 flags |= PD_DEREF;
3688 }
3689 flags = prison_lock_xlock(pr, flags);
3690 prison_deref_kill(pr, &freeprison);
3691 }
3692 }
3693 if (flags & PD_DEUREF) {
3694 /* Drop a user reference. */
3695 KASSERT(refcount_load(&pr->pr_uref) > 0,
3696 ("prison_deref PD_DEUREF on a dead prison (jid=%d)",
3697 pr->pr_id));
3698 if (!refcount_release_if_not_last(&pr->pr_uref)) {
3699 if (!(flags & PD_DEREF)) {
3700 prison_hold(pr);
3701 flags |= PD_DEREF;
3702 }
3703 flags = prison_lock_xlock(pr, flags);
3704 if (refcount_release(&pr->pr_uref) &&
3705 pr->pr_state == PRISON_STATE_ALIVE) {
3706 /*
3707 * When the last user references goes,
3708 * this becomes a dying prison.
3709 */
3710 KASSERT(
3711 refcount_load(&prison0.pr_uref) > 0,
3712 ("prison0 pr_uref=0"));
3713 pr->pr_state = PRISON_STATE_DYING;
3714 prison_cleanup_locked(pr);
3715 mtx_unlock(&pr->pr_mtx);
3716 flags &= ~PD_LOCKED;
3717 prison_cleanup_unlocked(pr);
3718 }
3719 }
3720 }
3721 if (flags & PD_KILL) {
3722 /*
3723 * Any remaining user references are probably processes
3724 * that need to be killed, either in this prison or its
3725 * descendants.
3726 */
3727 if (refcount_load(&pr->pr_uref) > 0)
3728 killpr = pr;
3729 /* Make sure the parent prison doesn't get killed. */
3730 flags &= ~PD_KILL;
3731 }
3732 if (flags & PD_DEREF) {
3733 /* Drop a reference. */
3734 KASSERT(refcount_load(&pr->pr_ref) > 0,
3735 ("prison_deref PD_DEREF on a dead prison (jid=%d)",
3736 pr->pr_id));
3737 if (!refcount_release_if_not_last(&pr->pr_ref)) {
3738 flags = prison_lock_xlock(pr, flags);
3739 if (refcount_release(&pr->pr_ref)) {
3740 /*
3741 * When the last reference goes,
3742 * unlink the prison and set it aside.
3743 */
3744 KASSERT(
3745 refcount_load(&pr->pr_uref) == 0,
3746 ("prison_deref: last ref, "
3747 "but still has %d urefs (jid=%d)",
3748 pr->pr_uref, pr->pr_id));
3749 KASSERT(
3750 refcount_load(&prison0.pr_ref) != 0,
3751 ("prison0 pr_ref=0"));
3752 #ifdef MAC
3753 /*
3754 * The MAC framework will call into any
3755 * policies that want to hook
3756 * prison_destroy_label, so ideally we
3757 * call this prior to any final state
3758 * invalidation to be safe.
3759 */
3760 mac_prison_destroy(pr);
3761 #endif
3762 pr->pr_state = PRISON_STATE_INVALID;
3763 TAILQ_REMOVE(&allprison, pr, pr_list);
3764 LIST_REMOVE(pr, pr_sibling);
3765 TAILQ_INSERT_TAIL(&freeprison, pr,
3766 pr_list);
3767 for (ppr = pr->pr_parent;
3768 ppr != NULL;
3769 ppr = ppr->pr_parent)
3770 ppr->pr_childcount--;
3771 /*
3772 * Removing a prison frees references
3773 * from its parent.
3774 */
3775 ppr = pr->pr_parent;
3776 pr->pr_parent = NULL;
3777 mtx_unlock(&pr->pr_mtx);
3778
3779 pr = ppr;
3780 flags &= ~PD_LOCKED;
3781 flags |= PD_DEREF | PD_DEUREF;
3782 continue;
3783 }
3784 }
3785 }
3786 break;
3787 }
3788
3789 /* Release all the prison locks. */
3790 if (flags & PD_LOCKED)
3791 mtx_unlock(&pr->pr_mtx);
3792 if (flags & PD_LIST_SLOCKED)
3793 sx_sunlock(&allprison_lock);
3794 else if (flags & PD_LIST_XLOCKED)
3795 sx_xunlock(&allprison_lock);
3796
3797 /* Kill any processes attached to a killed prison. */
3798 if (killpr != NULL)
3799 prison_proc_iterate(killpr, prison_kill_processes_cb, NULL);
3800
3801 /*
3802 * Finish removing any unreferenced prisons, which couldn't happen
3803 * while allprison_lock was held (to avoid a LOR on vrele).
3804 */
3805 TAILQ_FOREACH_SAFE(rpr, &freeprison, pr_list, tpr) {
3806 #ifdef VIMAGE
3807 if (rpr->pr_flags & PR_VNET)
3808 vnet_destroy(rpr->pr_vnet);
3809 #endif
3810 if (rpr->pr_root != NULL)
3811 vrele(rpr->pr_root);
3812 mtx_destroy(&rpr->pr_mtx);
3813 #ifdef INET
3814 prison_ip_free(rpr->pr_addrs[PR_INET]);
3815 #endif
3816 #ifdef INET6
3817 prison_ip_free(rpr->pr_addrs[PR_INET6]);
3818 #endif
3819 if (rpr->pr_cpuset != NULL)
3820 cpuset_rel(rpr->pr_cpuset);
3821 osd_jail_exit(rpr);
3822 #ifdef RACCT
3823 if (racct_enable)
3824 prison_racct_detach(rpr);
3825 #endif
3826 TAILQ_REMOVE(&freeprison, rpr, pr_list);
3827 free(rpr, M_PRISON);
3828 }
3829 }
3830
3831 /*
3832 * Kill the prison and its descendants. Mark them as dying, clear the
3833 * persist flag, and call module remove methods.
3834 */
3835 static void
prison_deref_kill(struct prison * pr,struct prisonlist * freeprison)3836 prison_deref_kill(struct prison *pr, struct prisonlist *freeprison)
3837 {
3838 struct prison *cpr, *ppr, *rpr;
3839 bool descend;
3840
3841 /*
3842 * Unlike the descendants, the target prison can be killed
3843 * even if it is currently dying. This is useful for failed
3844 * creation in jail_set(2).
3845 */
3846 KASSERT(refcount_load(&pr->pr_ref) > 0,
3847 ("Trying to kill dead prison %p (jid=%d).",
3848 pr, pr->pr_id));
3849 refcount_acquire(&pr->pr_uref);
3850 pr->pr_state = PRISON_STATE_DYING;
3851 mtx_unlock(&pr->pr_mtx);
3852
3853 rpr = NULL;
3854 FOREACH_PRISON_DESCENDANT_PRE_POST(pr, cpr, descend) {
3855 if (descend) {
3856 if (!prison_isalive(cpr)) {
3857 descend = false;
3858 continue;
3859 }
3860 prison_hold(cpr);
3861 prison_proc_hold(cpr);
3862 mtx_lock(&cpr->pr_mtx);
3863 cpr->pr_state = PRISON_STATE_DYING;
3864 cpr->pr_flags |= PR_REMOVE;
3865 mtx_unlock(&cpr->pr_mtx);
3866 continue;
3867 }
3868 if (!(cpr->pr_flags & PR_REMOVE))
3869 continue;
3870 prison_cleanup_unlocked(cpr);
3871 mtx_lock(&cpr->pr_mtx);
3872 prison_cleanup_locked(cpr);
3873 cpr->pr_flags &= ~PR_REMOVE;
3874 if (cpr->pr_flags & PR_PERSIST) {
3875 cpr->pr_flags &= ~PR_PERSIST;
3876 prison_proc_free_not_last(cpr);
3877 prison_free_not_last(cpr);
3878 }
3879 (void)refcount_release(&cpr->pr_uref);
3880 if (refcount_release(&cpr->pr_ref)) {
3881 /*
3882 * When the last reference goes, unlink the prison
3883 * and set it aside for prison_deref() to handle.
3884 * Delay unlinking the sibling list to keep the loop
3885 * safe.
3886 */
3887 if (rpr != NULL)
3888 LIST_REMOVE(rpr, pr_sibling);
3889 rpr = cpr;
3890 rpr->pr_state = PRISON_STATE_INVALID;
3891 TAILQ_REMOVE(&allprison, rpr, pr_list);
3892 TAILQ_INSERT_TAIL(freeprison, rpr, pr_list);
3893 /*
3894 * Removing a prison frees references from its parent.
3895 */
3896 ppr = rpr->pr_parent;
3897 prison_proc_free_not_last(ppr);
3898 prison_free_not_last(ppr);
3899 for (; ppr != NULL; ppr = ppr->pr_parent)
3900 ppr->pr_childcount--;
3901 }
3902 mtx_unlock(&cpr->pr_mtx);
3903 }
3904 if (rpr != NULL)
3905 LIST_REMOVE(rpr, pr_sibling);
3906
3907 prison_cleanup_unlocked(pr);
3908 mtx_lock(&pr->pr_mtx);
3909 prison_cleanup_locked(pr);
3910 if (pr->pr_flags & PR_PERSIST) {
3911 pr->pr_flags &= ~PR_PERSIST;
3912 prison_proc_free_not_last(pr);
3913 prison_free_not_last(pr);
3914 }
3915 (void)refcount_release(&pr->pr_uref);
3916 }
3917
3918 /*
3919 * Given the current locking state in the flags, make sure allprison_lock
3920 * is held exclusive, and the prison is locked. Return flags indicating
3921 * the new state.
3922 */
3923 static int
prison_lock_xlock(struct prison * pr,int flags)3924 prison_lock_xlock(struct prison *pr, int flags)
3925 {
3926
3927 if (!(flags & PD_LIST_XLOCKED)) {
3928 /*
3929 * Get allprison_lock, which may be an upgrade,
3930 * and may require unlocking the prison.
3931 */
3932 if (flags & PD_LOCKED) {
3933 mtx_unlock(&pr->pr_mtx);
3934 flags &= ~PD_LOCKED;
3935 }
3936 if (flags & PD_LIST_SLOCKED) {
3937 if (!sx_try_upgrade(&allprison_lock)) {
3938 sx_sunlock(&allprison_lock);
3939 sx_xlock(&allprison_lock);
3940 }
3941 flags &= ~PD_LIST_SLOCKED;
3942 } else
3943 sx_xlock(&allprison_lock);
3944 flags |= PD_LIST_XLOCKED;
3945 }
3946 if (!(flags & PD_LOCKED)) {
3947 /* Lock the prison mutex. */
3948 mtx_lock(&pr->pr_mtx);
3949 flags |= PD_LOCKED;
3950 }
3951 return flags;
3952 }
3953
3954 /*
3955 * Release a prison's resources when it starts dying (when the last user
3956 * reference is dropped, or when it is killed). Two functions are called,
3957 * for work that requires a locked prison or an unlocked one.
3958 */
3959 static void
prison_cleanup_locked(struct prison * pr)3960 prison_cleanup_locked(struct prison *pr)
3961 {
3962 sx_assert(&allprison_lock, SA_XLOCKED);
3963 mtx_assert(&pr->pr_mtx, MA_OWNED);
3964 prison_knote(pr, NOTE_JAIL_REMOVE);
3965 knlist_detach(pr->pr_klist);
3966 jaildesc_prison_cleanup(pr);
3967 pr->pr_klist = NULL;
3968 }
3969
3970 static void
prison_cleanup_unlocked(struct prison * pr)3971 prison_cleanup_unlocked(struct prison *pr)
3972 {
3973 sx_assert(&allprison_lock, SA_XLOCKED);
3974 mtx_assert(&pr->pr_mtx, MA_NOTOWNED);
3975 vfs_exjail_delete(pr);
3976 shm_remove_prison(pr);
3977 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
3978 }
3979
3980 /*
3981 * Set or clear a permission bit in the pr_allow field, passing restrictions
3982 * (cleared permission) down to child jails.
3983 */
3984 void
prison_set_allow(struct ucred * cred,unsigned flag,int enable)3985 prison_set_allow(struct ucred *cred, unsigned flag, int enable)
3986 {
3987 struct prison *pr;
3988
3989 pr = cred->cr_prison;
3990 sx_slock(&allprison_lock);
3991 mtx_lock(&pr->pr_mtx);
3992 prison_set_allow_locked(pr, flag, enable);
3993 mtx_unlock(&pr->pr_mtx);
3994 sx_sunlock(&allprison_lock);
3995 }
3996
3997 static void
prison_set_allow_locked(struct prison * pr,unsigned flag,int enable)3998 prison_set_allow_locked(struct prison *pr, unsigned flag, int enable)
3999 {
4000 struct prison *cpr;
4001 int descend;
4002
4003 if (enable != 0)
4004 pr->pr_allow |= flag;
4005 else {
4006 pr->pr_allow &= ~flag;
4007 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
4008 cpr->pr_allow &= ~flag;
4009 }
4010 }
4011
4012 /*
4013 * Check if a jail supports the given address family.
4014 *
4015 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
4016 * if not.
4017 */
4018 int
prison_check_af(struct ucred * cred,int af)4019 prison_check_af(struct ucred *cred, int af)
4020 {
4021 struct prison *pr;
4022 int error;
4023
4024 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
4025
4026 pr = cred->cr_prison;
4027 #ifdef VIMAGE
4028 /* Prisons with their own network stack are not limited. */
4029 if (prison_owns_vnet(pr))
4030 return (0);
4031 #endif
4032
4033 error = 0;
4034 switch (af)
4035 {
4036 #ifdef INET
4037 case AF_INET:
4038 if (pr->pr_flags & PR_IP4)
4039 {
4040 mtx_lock(&pr->pr_mtx);
4041 if ((pr->pr_flags & PR_IP4) &&
4042 pr->pr_addrs[PR_INET] == NULL)
4043 error = EAFNOSUPPORT;
4044 mtx_unlock(&pr->pr_mtx);
4045 }
4046 break;
4047 #endif
4048 #ifdef INET6
4049 case AF_INET6:
4050 if (pr->pr_flags & PR_IP6)
4051 {
4052 mtx_lock(&pr->pr_mtx);
4053 if ((pr->pr_flags & PR_IP6) &&
4054 pr->pr_addrs[PR_INET6] == NULL)
4055 error = EAFNOSUPPORT;
4056 mtx_unlock(&pr->pr_mtx);
4057 }
4058 break;
4059 #endif
4060 case AF_LOCAL:
4061 case AF_ROUTE:
4062 case AF_NETLINK:
4063 break;
4064 default:
4065 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
4066 error = EAFNOSUPPORT;
4067 }
4068 return (error);
4069 }
4070
4071 /*
4072 * Check if given address belongs to the jail referenced by cred (wrapper to
4073 * prison_check_ip[46]).
4074 *
4075 * Returns 0 if jail doesn't restrict the address family or if address belongs
4076 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
4077 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
4078 */
4079 int
prison_if(struct ucred * cred,const struct sockaddr * sa)4080 prison_if(struct ucred *cred, const struct sockaddr *sa)
4081 {
4082 #ifdef INET
4083 const struct sockaddr_in *sai;
4084 #endif
4085 #ifdef INET6
4086 const struct sockaddr_in6 *sai6;
4087 #endif
4088 int error;
4089
4090 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
4091 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
4092
4093 #ifdef VIMAGE
4094 if (prison_owns_vnet(cred->cr_prison))
4095 return (0);
4096 #endif
4097
4098 error = 0;
4099 switch (sa->sa_family)
4100 {
4101 #ifdef INET
4102 case AF_INET:
4103 sai = (const struct sockaddr_in *)sa;
4104 error = prison_check_ip4(cred, &sai->sin_addr);
4105 break;
4106 #endif
4107 #ifdef INET6
4108 case AF_INET6:
4109 sai6 = (const struct sockaddr_in6 *)sa;
4110 error = prison_check_ip6(cred, &sai6->sin6_addr);
4111 break;
4112 #endif
4113 default:
4114 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
4115 error = EAFNOSUPPORT;
4116 }
4117 return (error);
4118 }
4119
4120 /*
4121 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
4122 */
4123 int
prison_check(struct ucred * cred1,struct ucred * cred2)4124 prison_check(struct ucred *cred1, struct ucred *cred2)
4125 {
4126
4127 return ((cred1->cr_prison == cred2->cr_prison ||
4128 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
4129 }
4130
4131 /*
4132 * For mountd/nfsd to run within a prison, it must be:
4133 * - A vnet prison.
4134 * - PR_ALLOW_NFSD must be set on it.
4135 * - The root directory (pr_root) of the prison must be
4136 * a file system mount point, so the mountd can hang
4137 * export information on it.
4138 * - The prison's enforce_statfs cannot be 0, so that
4139 * mountd(8) can do exports.
4140 */
4141 bool
prison_check_nfsd(struct ucred * cred)4142 prison_check_nfsd(struct ucred *cred)
4143 {
4144
4145 if (jailed_without_vnet(cred))
4146 return (false);
4147 if (!prison_allow(cred, PR_ALLOW_NFSD))
4148 return (false);
4149 if ((cred->cr_prison->pr_root->v_vflag & VV_ROOT) == 0)
4150 return (false);
4151 if (cred->cr_prison->pr_enforce_statfs == 0)
4152 return (false);
4153 return (true);
4154 }
4155
4156 /*
4157 * Return true if p2 is a child of p1, otherwise false.
4158 */
4159 bool
prison_ischild(struct prison * pr1,struct prison * pr2)4160 prison_ischild(struct prison *pr1, struct prison *pr2)
4161 {
4162
4163 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
4164 if (pr1 == pr2)
4165 return (true);
4166 return (false);
4167 }
4168
4169 /*
4170 * Return true if the prison is currently alive. A prison is alive if it
4171 * holds user references and it isn't being removed.
4172 */
4173 bool
prison_isalive(const struct prison * pr)4174 prison_isalive(const struct prison *pr)
4175 {
4176
4177 if (__predict_false(pr->pr_state != PRISON_STATE_ALIVE))
4178 return (false);
4179 return (true);
4180 }
4181
4182 /*
4183 * Return true if the prison is currently valid. A prison is valid if it has
4184 * been fully created, and is not being destroyed. Note that dying prisons
4185 * are still considered valid. Invalid prisons won't be found under normal
4186 * circumstances, as they're only put in that state by functions that have
4187 * an exclusive hold on allprison_lock.
4188 */
4189 bool
prison_isvalid(struct prison * pr)4190 prison_isvalid(struct prison *pr)
4191 {
4192
4193 if (__predict_false(pr->pr_state == PRISON_STATE_INVALID))
4194 return (false);
4195 if (__predict_false(refcount_load(&pr->pr_ref) == 0))
4196 return (false);
4197 return (true);
4198 }
4199
4200 /*
4201 * Return true if the passed credential is in a jail and that jail does not
4202 * have its own virtual network stack, otherwise false.
4203 */
4204 bool
jailed_without_vnet(struct ucred * cred)4205 jailed_without_vnet(struct ucred *cred)
4206 {
4207
4208 if (!jailed(cred))
4209 return (false);
4210 #ifdef VIMAGE
4211 if (prison_owns_vnet(cred->cr_prison))
4212 return (false);
4213 #endif
4214
4215 return (true);
4216 }
4217
4218 /*
4219 * Return the correct hostname (domainname, et al) for the passed credential.
4220 */
4221 void
getcredhostname(struct ucred * cred,char * buf,size_t size)4222 getcredhostname(struct ucred *cred, char *buf, size_t size)
4223 {
4224 struct prison *pr;
4225
4226 /*
4227 * A NULL credential can be used to shortcut to the physical
4228 * system's hostname.
4229 */
4230 pr = (cred != NULL) ? cred->cr_prison : &prison0;
4231 mtx_lock(&pr->pr_mtx);
4232 strlcpy(buf, pr->pr_hostname, size);
4233 mtx_unlock(&pr->pr_mtx);
4234 }
4235
4236 void
getcreddomainname(struct ucred * cred,char * buf,size_t size)4237 getcreddomainname(struct ucred *cred, char *buf, size_t size)
4238 {
4239
4240 mtx_lock(&cred->cr_prison->pr_mtx);
4241 strlcpy(buf, cred->cr_prison->pr_domainname, size);
4242 mtx_unlock(&cred->cr_prison->pr_mtx);
4243 }
4244
4245 void
getcredhostuuid(struct ucred * cred,char * buf,size_t size)4246 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
4247 {
4248
4249 mtx_lock(&cred->cr_prison->pr_mtx);
4250 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
4251 mtx_unlock(&cred->cr_prison->pr_mtx);
4252 }
4253
4254 void
getcredhostid(struct ucred * cred,unsigned long * hostid)4255 getcredhostid(struct ucred *cred, unsigned long *hostid)
4256 {
4257
4258 mtx_lock(&cred->cr_prison->pr_mtx);
4259 *hostid = cred->cr_prison->pr_hostid;
4260 mtx_unlock(&cred->cr_prison->pr_mtx);
4261 }
4262
4263 void
getjailname(struct ucred * cred,char * name,size_t len)4264 getjailname(struct ucred *cred, char *name, size_t len)
4265 {
4266
4267 mtx_lock(&cred->cr_prison->pr_mtx);
4268 strlcpy(name, cred->cr_prison->pr_name, len);
4269 mtx_unlock(&cred->cr_prison->pr_mtx);
4270 }
4271
4272 #ifdef VIMAGE
4273 /*
4274 * Determine whether the prison owns its VNET.
4275 */
4276 bool
prison_owns_vnet(struct prison * pr)4277 prison_owns_vnet(struct prison *pr)
4278 {
4279
4280 /*
4281 * vnets cannot be added/removed after jail creation,
4282 * so no need to lock here.
4283 */
4284 return ((pr->pr_flags & PR_VNET) != 0);
4285 }
4286 #endif
4287
4288 /*
4289 * Determine whether the subject represented by cred can "see"
4290 * status of a mount point.
4291 * Returns: 0 for permitted, ENOENT otherwise.
4292 * XXX: This function should be called cr_canseemount() and should be
4293 * placed in kern_prot.c.
4294 */
4295 int
prison_canseemount(struct ucred * cred,struct mount * mp)4296 prison_canseemount(struct ucred *cred, struct mount *mp)
4297 {
4298 struct prison *pr;
4299 struct statfs *sp;
4300 size_t len;
4301
4302 pr = cred->cr_prison;
4303 if (pr->pr_enforce_statfs == 0)
4304 return (0);
4305 if (pr->pr_root->v_mount == mp)
4306 return (0);
4307 if (pr->pr_enforce_statfs == 2)
4308 return (ENOENT);
4309 /*
4310 * If jail's chroot directory is set to "/" we should be able to see
4311 * all mount-points from inside a jail.
4312 * This is ugly check, but this is the only situation when jail's
4313 * directory ends with '/'.
4314 */
4315 if (strcmp(pr->pr_path, "/") == 0)
4316 return (0);
4317 len = strlen(pr->pr_path);
4318 sp = &mp->mnt_stat;
4319 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
4320 return (ENOENT);
4321 /*
4322 * Be sure that we don't have situation where jail's root directory
4323 * is "/some/path" and mount point is "/some/pathpath".
4324 */
4325 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
4326 return (ENOENT);
4327 return (0);
4328 }
4329
4330 void
prison_enforce_statfs(struct ucred * cred,struct mount * mp,struct statfs * sp)4331 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
4332 {
4333 char jpath[MAXPATHLEN];
4334 struct prison *pr;
4335 size_t len;
4336
4337 pr = cred->cr_prison;
4338 if (pr->pr_enforce_statfs == 0)
4339 return;
4340 if (prison_canseemount(cred, mp) != 0) {
4341 bzero(&sp->f_fsid, sizeof(sp->f_fsid));
4342 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
4343 strlcpy(sp->f_mntonname, "[restricted]",
4344 sizeof(sp->f_mntonname));
4345 return;
4346 }
4347 if (pr->pr_enforce_statfs > 1)
4348 bzero(&sp->f_fsid, sizeof(sp->f_fsid));
4349 if (pr->pr_root->v_mount == mp) {
4350 /*
4351 * Clear current buffer data, so we are sure nothing from
4352 * the valid path left there.
4353 */
4354 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
4355 *sp->f_mntonname = '/';
4356 return;
4357 }
4358 /*
4359 * If jail's chroot directory is set to "/" we should be able to see
4360 * all mount-points from inside a jail.
4361 */
4362 if (strcmp(pr->pr_path, "/") == 0)
4363 return;
4364 len = strlen(pr->pr_path);
4365 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
4366 /*
4367 * Clear current buffer data, so we are sure nothing from
4368 * the valid path left there.
4369 */
4370 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
4371 if (*jpath == '\0') {
4372 /* Should never happen. */
4373 *sp->f_mntonname = '/';
4374 } else {
4375 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
4376 }
4377 }
4378
4379 /*
4380 * Check with permission for a specific privilege is granted within jail. We
4381 * have a specific list of accepted privileges; the rest are denied.
4382 */
4383 int
prison_priv_check(struct ucred * cred,int priv)4384 prison_priv_check(struct ucred *cred, int priv)
4385 {
4386 struct prison *pr;
4387 int error;
4388
4389 /*
4390 * Some policies have custom handlers. This routine should not be
4391 * called for them. See priv_check_cred().
4392 */
4393 switch (priv) {
4394 case PRIV_VFS_LOOKUP:
4395 case PRIV_VFS_GENERATION:
4396 KASSERT(0, ("prison_priv_check instead of a custom handler "
4397 "called for %d\n", priv));
4398 }
4399
4400 if (!jailed(cred))
4401 return (0);
4402
4403 #ifdef VIMAGE
4404 /*
4405 * Privileges specific to prisons with a virtual network stack.
4406 * There might be a duplicate entry here in case the privilege
4407 * is only granted conditionally in the legacy jail case.
4408 */
4409 switch (priv) {
4410 /*
4411 * NFS-specific privileges.
4412 */
4413 case PRIV_NFS_DAEMON:
4414 case PRIV_VFS_GETFH:
4415 case PRIV_VFS_MOUNT_EXPORTED:
4416 if (!prison_check_nfsd(cred))
4417 return (EPERM);
4418 #ifdef notyet
4419 case PRIV_NFS_LOCKD:
4420 #endif
4421 /*
4422 * Network stack privileges.
4423 */
4424 case PRIV_NET_BRIDGE:
4425 case PRIV_NET_GRE:
4426 case PRIV_NET_BPF:
4427 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
4428 case PRIV_NET_ROUTE:
4429 case PRIV_NET_TAP:
4430 case PRIV_NET_SETIFMTU:
4431 case PRIV_NET_SETIFFLAGS:
4432 case PRIV_NET_SETIFCAP:
4433 case PRIV_NET_SETIFDESCR:
4434 case PRIV_NET_SETIFNAME :
4435 case PRIV_NET_SETIFMETRIC:
4436 case PRIV_NET_SETIFPHYS:
4437 case PRIV_NET_SETIFMAC:
4438 case PRIV_NET_SETLANPCP:
4439 case PRIV_NET_ADDMULTI:
4440 case PRIV_NET_DELMULTI:
4441 case PRIV_NET_HWIOCTL:
4442 case PRIV_NET_SETLLADDR:
4443 case PRIV_NET_ADDIFGROUP:
4444 case PRIV_NET_DELIFGROUP:
4445 case PRIV_NET_IFCREATE:
4446 case PRIV_NET_IFDESTROY:
4447 case PRIV_NET_ADDIFADDR:
4448 case PRIV_NET_DELIFADDR:
4449 case PRIV_NET_LAGG:
4450 case PRIV_NET_GIF:
4451 case PRIV_NET_SETIFVNET:
4452 case PRIV_NET_SETIFFIB:
4453 case PRIV_NET_OVPN:
4454 case PRIV_NET_GENEVE:
4455 case PRIV_NET_ME:
4456 case PRIV_NET_WG:
4457
4458 /*
4459 * 802.11-related privileges.
4460 */
4461 case PRIV_NET80211_VAP_GETKEY:
4462 case PRIV_NET80211_VAP_MANAGE:
4463
4464 #ifdef notyet
4465 /*
4466 * ATM privileges.
4467 */
4468 case PRIV_NETATM_CFG:
4469 case PRIV_NETATM_ADD:
4470 case PRIV_NETATM_DEL:
4471 case PRIV_NETATM_SET:
4472
4473 /*
4474 * Bluetooth privileges.
4475 */
4476 case PRIV_NETBLUETOOTH_RAW:
4477 #endif
4478
4479 /*
4480 * Netgraph and netgraph module privileges.
4481 */
4482 case PRIV_NETGRAPH_CONTROL:
4483 #ifdef notyet
4484 case PRIV_NETGRAPH_TTY:
4485 #endif
4486
4487 /*
4488 * IPv4 and IPv6 privileges.
4489 */
4490 case PRIV_NETINET_IPFW:
4491 case PRIV_NETINET_DIVERT:
4492 case PRIV_NETINET_PF:
4493 case PRIV_NETINET_DUMMYNET:
4494 case PRIV_NETINET_CARP:
4495 case PRIV_NETINET_MROUTE:
4496 case PRIV_NETINET_RAW:
4497 case PRIV_NETINET_ADDRCTRL6:
4498 case PRIV_NETINET_ND6:
4499 case PRIV_NETINET_SCOPE6:
4500 case PRIV_NETINET_ALIFETIME6:
4501 case PRIV_NETINET_IPSEC:
4502 case PRIV_NETINET_BINDANY:
4503
4504 #ifdef notyet
4505 /*
4506 * NCP privileges.
4507 */
4508 case PRIV_NETNCP:
4509
4510 /*
4511 * SMB privileges.
4512 */
4513 case PRIV_NETSMB:
4514 #endif
4515
4516 /*
4517 * No default: or deny here.
4518 * In case of no permit fall through to next switch().
4519 */
4520 if (cred->cr_prison->pr_flags & PR_VNET)
4521 return (0);
4522 }
4523 #endif /* VIMAGE */
4524
4525 switch (priv) {
4526 /*
4527 * Allow ktrace privileges for root in jail.
4528 */
4529 case PRIV_KTRACE:
4530 return (0);
4531
4532 /*
4533 * Allow jailed processes to configure audit identity and
4534 * submit audit records (login, etc). In the future we may
4535 * want to further refine the relationship between audit and
4536 * jail.
4537 */
4538 case PRIV_AUDIT_GETAUDIT:
4539 case PRIV_AUDIT_SETAUDIT:
4540 if (cred->cr_prison->pr_allow & PR_ALLOW_SETAUDIT)
4541 return (0);
4542 else
4543 return (EPERM);
4544 #if 0
4545 case PRIV_AUDIT_SUBMIT:
4546 #endif
4547
4548 /*
4549 * Allow jailed processes to manipulate process UNIX
4550 * credentials in any way they see fit.
4551 */
4552 case PRIV_CRED_SETCRED:
4553 case PRIV_CRED_SETUID:
4554 case PRIV_CRED_SETEUID:
4555 case PRIV_CRED_SETGID:
4556 case PRIV_CRED_SETEGID:
4557 case PRIV_CRED_SETGROUPS:
4558 case PRIV_CRED_SETREUID:
4559 case PRIV_CRED_SETREGID:
4560 case PRIV_CRED_SETRESUID:
4561 case PRIV_CRED_SETRESGID:
4562
4563 /*
4564 * Jail implements visibility constraints already, so allow
4565 * jailed root to override uid/gid-based constraints.
4566 */
4567 case PRIV_SEEOTHERGIDS:
4568 case PRIV_SEEOTHERUIDS:
4569 case PRIV_SEEJAILPROC:
4570
4571 /*
4572 * Jail implements inter-process debugging limits already, so
4573 * allow jailed root various debugging privileges.
4574 */
4575 case PRIV_DEBUG_DIFFCRED:
4576 case PRIV_DEBUG_SUGID:
4577 case PRIV_DEBUG_UNPRIV:
4578 case PRIV_DEBUG_DIFFJAIL:
4579
4580 /*
4581 * Allow jail to set various resource limits and login
4582 * properties, and for now, exceed process resource limits.
4583 */
4584 case PRIV_PROC_LIMIT:
4585 case PRIV_PROC_SETLOGIN:
4586 case PRIV_PROC_SETRLIMIT:
4587
4588 /*
4589 * Debuggers should work in jails.
4590 */
4591 case PRIV_PROC_MEM_WRITE:
4592
4593 /*
4594 * System V and POSIX IPC privileges are granted in jail.
4595 */
4596 case PRIV_IPC_READ:
4597 case PRIV_IPC_WRITE:
4598 case PRIV_IPC_ADMIN:
4599 case PRIV_IPC_MSGSIZE:
4600 case PRIV_MQ_ADMIN:
4601
4602 /*
4603 * Jail operations within a jail work on child jails.
4604 */
4605 case PRIV_JAIL_ATTACH:
4606 case PRIV_JAIL_SET:
4607 case PRIV_JAIL_REMOVE:
4608
4609 /*
4610 * Jail implements its own inter-process limits, so allow
4611 * root processes in jail to change scheduling on other
4612 * processes in the same jail. Likewise for signalling.
4613 */
4614 case PRIV_SCHED_DIFFCRED:
4615 case PRIV_SCHED_CPUSET:
4616 case PRIV_SCHED_DIFFJAIL:
4617 case PRIV_SIGNAL_DIFFCRED:
4618 case PRIV_SIGNAL_SUGID:
4619 case PRIV_SIGNAL_DIFFJAIL:
4620
4621 /*
4622 * Allow jailed processes to write to sysctls marked as jail
4623 * writable.
4624 */
4625 case PRIV_SYSCTL_WRITEJAIL:
4626
4627 /*
4628 * Allow root in jail to manage a variety of quota
4629 * properties. These should likely be conditional on a
4630 * configuration option.
4631 */
4632 case PRIV_VFS_GETQUOTA:
4633 case PRIV_VFS_SETQUOTA:
4634
4635 /*
4636 * Since Jail relies on chroot() to implement file system
4637 * protections, grant many VFS privileges to root in jail.
4638 * Be careful to exclude mount-related and NFS-related
4639 * privileges.
4640 */
4641 case PRIV_VFS_READ:
4642 case PRIV_VFS_WRITE:
4643 case PRIV_VFS_ADMIN:
4644 case PRIV_VFS_EXEC:
4645 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
4646 case PRIV_VFS_CHFLAGS_DEV:
4647 case PRIV_VFS_CHOWN:
4648 case PRIV_VFS_CHROOT:
4649 case PRIV_VFS_RETAINSUGID:
4650 case PRIV_VFS_FCHROOT:
4651 case PRIV_VFS_LINK:
4652 case PRIV_VFS_SETGID:
4653 case PRIV_VFS_STAT:
4654 case PRIV_VFS_STICKYFILE:
4655
4656 /*
4657 * As in the non-jail case, non-root users are expected to be
4658 * able to read kernel/physical memory (provided /dev/[k]mem
4659 * exists in the jail and they have permission to access it).
4660 */
4661 case PRIV_KMEM_READ:
4662 return (0);
4663
4664 /*
4665 * Depending on the global setting, allow privilege of
4666 * setting system flags.
4667 */
4668 case PRIV_VFS_SYSFLAGS:
4669 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
4670 return (0);
4671 else
4672 return (EPERM);
4673
4674 /*
4675 * Depending on the global setting, allow privilege of
4676 * mounting/unmounting file systems.
4677 */
4678 case PRIV_VFS_MOUNT:
4679 case PRIV_VFS_UNMOUNT:
4680 case PRIV_VFS_MOUNT_NONUSER:
4681 case PRIV_VFS_MOUNT_OWNER:
4682 pr = cred->cr_prison;
4683 prison_lock(pr);
4684 if (pr->pr_allow & PR_ALLOW_MOUNT && pr->pr_enforce_statfs < 2)
4685 error = 0;
4686 else
4687 error = EPERM;
4688 prison_unlock(pr);
4689 return (error);
4690
4691 /*
4692 * Jails should hold no disposition on the PRIV_VFS_READ_DIR
4693 * policy. priv_check_cred will not specifically allow it, and
4694 * we may want a MAC policy to allow it.
4695 */
4696 case PRIV_VFS_READ_DIR:
4697 return (0);
4698
4699 /*
4700 * Conditionally allow privileged process in the jail to
4701 * manipulate filesystem extended attributes in the system
4702 * namespace.
4703 */
4704 case PRIV_VFS_EXTATTR_SYSTEM:
4705 if ((cred->cr_prison->pr_allow & PR_ALLOW_EXTATTR) != 0)
4706 return (0);
4707 else
4708 return (EPERM);
4709
4710 /*
4711 * Conditionnaly allow locking (unlocking) physical pages
4712 * in memory.
4713 */
4714 case PRIV_VM_MLOCK:
4715 case PRIV_VM_MUNLOCK:
4716 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK)
4717 return (0);
4718 else
4719 return (EPERM);
4720
4721 /*
4722 * Conditionally allow jailed root to bind reserved ports.
4723 */
4724 case PRIV_NETINET_RESERVEDPORT:
4725 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS)
4726 return (0);
4727 else
4728 return (EPERM);
4729
4730 /*
4731 * Allow jailed root to reuse in-use ports.
4732 */
4733 case PRIV_NETINET_REUSEPORT:
4734 return (0);
4735
4736 /*
4737 * Allow jailed root to set certain IPv4/6 (option) headers.
4738 */
4739 case PRIV_NETINET_SETHDROPTS:
4740 return (0);
4741
4742 /*
4743 * Conditionally allow creating raw sockets in jail.
4744 */
4745 case PRIV_NETINET_RAW:
4746 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
4747 return (0);
4748 else
4749 return (EPERM);
4750
4751 /*
4752 * Since jail implements its own visibility limits on netstat
4753 * sysctls, allow getcred. This allows identd to work in
4754 * jail.
4755 */
4756 case PRIV_NETINET_GETCRED:
4757 return (0);
4758
4759 /*
4760 * Allow jailed root to set loginclass.
4761 */
4762 case PRIV_PROC_SETLOGINCLASS:
4763 return (0);
4764
4765 /*
4766 * Do not allow a process inside a jail to read the kernel
4767 * message buffer unless explicitly permitted.
4768 */
4769 case PRIV_MSGBUF:
4770 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF)
4771 return (0);
4772 return (EPERM);
4773
4774 /*
4775 * Conditionally allow privileged process in the jail adjust
4776 * machine time.
4777 */
4778 case PRIV_ADJTIME:
4779 case PRIV_NTP_ADJTIME:
4780 if (cred->cr_prison->pr_allow &
4781 (PR_ALLOW_ADJTIME | PR_ALLOW_SETTIME)) {
4782 return (0);
4783 }
4784 return (EPERM);
4785
4786 /*
4787 * Conditionally allow privileged process in the jail set
4788 * machine time.
4789 */
4790 case PRIV_SETTIMEOFDAY:
4791 case PRIV_CLOCK_SETTIME:
4792 if (cred->cr_prison->pr_allow & PR_ALLOW_SETTIME)
4793 return (0);
4794 else
4795 return (EPERM);
4796
4797 /*
4798 * Conditionally allow privileged process in the jail to modify
4799 * the routing table.
4800 */
4801 case PRIV_NET_ROUTE:
4802 if (cred->cr_prison->pr_allow & PR_ALLOW_ROUTING)
4803 return (0);
4804 else
4805 return (EPERM);
4806
4807 case PRIV_VMM_CREATE:
4808 case PRIV_VMM_DESTROY:
4809 /*
4810 * Jailed root can create and destroy VMs; the vmm module
4811 * additionally checks for the allow.vmm flag.
4812 */
4813 return (0);
4814
4815 case PRIV_VMM_PPTDEV:
4816 /*
4817 * Allow jailed root to manage passthrough devices. vmm(4) also
4818 * checks for the dynamically added allow.vmm_ppt.
4819 */
4820 return (0);
4821
4822 default:
4823 /*
4824 * In all remaining cases, deny the privilege request. This
4825 * includes almost all network privileges, many system
4826 * configuration privileges.
4827 */
4828 return (EPERM);
4829 }
4830 }
4831
4832 /*
4833 * Return the part of pr2's name that is relative to pr1, or the whole name
4834 * if it does not directly follow.
4835 */
4836
4837 char *
prison_name(struct prison * pr1,struct prison * pr2)4838 prison_name(struct prison *pr1, struct prison *pr2)
4839 {
4840 char *name;
4841
4842 /* Jails see themselves as "0" (if they see themselves at all). */
4843 if (pr1 == pr2)
4844 return "0";
4845 name = pr2->pr_name;
4846 if (prison_ischild(pr1, pr2)) {
4847 /*
4848 * pr1 isn't locked (and allprison_lock may not be either)
4849 * so its length can't be counted on. But the number of dots
4850 * can be counted on - and counted.
4851 */
4852 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
4853 name = strchr(name, '.') + 1;
4854 }
4855 return (name);
4856 }
4857
4858 /*
4859 * Return the part of pr2's path that is relative to pr1, or the whole path
4860 * if it does not directly follow.
4861 */
4862 static char *
prison_path(struct prison * pr1,struct prison * pr2)4863 prison_path(struct prison *pr1, struct prison *pr2)
4864 {
4865 char *path1, *path2;
4866 int len1;
4867
4868 path1 = pr1->pr_path;
4869 path2 = pr2->pr_path;
4870 if (!strcmp(path1, "/"))
4871 return (path2);
4872 len1 = strlen(path1);
4873 if (strncmp(path1, path2, len1))
4874 return (path2);
4875 if (path2[len1] == '\0')
4876 return "/";
4877 if (path2[len1] == '/')
4878 return (path2 + len1);
4879 return (path2);
4880 }
4881
4882 /*
4883 * Jail-related sysctls.
4884 */
4885 SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
4886 "Jails");
4887
4888 #if defined(INET) || defined(INET6)
4889 /*
4890 * Copy address array to memory that would be then SYSCTL_OUT-ed.
4891 * sysctl_jail_list() helper.
4892 */
4893 static void
prison_ip_copyout(struct prison * pr,const pr_family_t af,void ** out,int * len)4894 prison_ip_copyout(struct prison *pr, const pr_family_t af, void **out, int *len)
4895 {
4896 const struct prison_ip *pip;
4897 const size_t size = pr_families[af].size;
4898
4899 again:
4900 mtx_assert(&pr->pr_mtx, MA_OWNED);
4901 if ((pip = pr->pr_addrs[af]) != NULL) {
4902 if (*len < pip->ips) {
4903 *len = pip->ips;
4904 mtx_unlock(&pr->pr_mtx);
4905 *out = realloc(*out, *len * size, M_TEMP, M_WAITOK);
4906 mtx_lock(&pr->pr_mtx);
4907 goto again;
4908 }
4909 bcopy(pip->pr_ip, *out, pip->ips * size);
4910 }
4911 }
4912 #endif
4913
4914 static int
sysctl_jail_list(SYSCTL_HANDLER_ARGS)4915 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
4916 {
4917 struct xprison *xp;
4918 struct prison *pr, *cpr;
4919 #ifdef INET
4920 struct in_addr *ip4 = NULL;
4921 int ip4s = 0;
4922 #endif
4923 #ifdef INET6
4924 struct in6_addr *ip6 = NULL;
4925 int ip6s = 0;
4926 #endif
4927 int descend, error;
4928
4929 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
4930 pr = req->td->td_ucred->cr_prison;
4931 error = 0;
4932 sx_slock(&allprison_lock);
4933 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
4934 mtx_lock(&cpr->pr_mtx);
4935 #ifdef INET
4936 prison_ip_copyout(cpr, PR_INET, (void **)&ip4, &ip4s);
4937 #endif
4938 #ifdef INET6
4939 prison_ip_copyout(cpr, PR_INET6, (void **)&ip6, &ip6s);
4940 #endif
4941 bzero(xp, sizeof(*xp));
4942 xp->pr_version = XPRISON_VERSION;
4943 xp->pr_id = cpr->pr_id;
4944 xp->pr_state = cpr->pr_state;
4945 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
4946 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
4947 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
4948 #ifdef INET
4949 xp->pr_ip4s = ip4s;
4950 #endif
4951 #ifdef INET6
4952 xp->pr_ip6s = ip6s;
4953 #endif
4954 mtx_unlock(&cpr->pr_mtx);
4955 error = SYSCTL_OUT(req, xp, sizeof(*xp));
4956 if (error)
4957 break;
4958 #ifdef INET
4959 if (xp->pr_ip4s > 0) {
4960 error = SYSCTL_OUT(req, ip4,
4961 xp->pr_ip4s * sizeof(struct in_addr));
4962 if (error)
4963 break;
4964 }
4965 #endif
4966 #ifdef INET6
4967 if (xp->pr_ip6s > 0) {
4968 error = SYSCTL_OUT(req, ip6,
4969 xp->pr_ip6s * sizeof(struct in6_addr));
4970 if (error)
4971 break;
4972 }
4973 #endif
4974 }
4975 sx_sunlock(&allprison_lock);
4976 free(xp, M_TEMP);
4977 #ifdef INET
4978 free(ip4, M_TEMP);
4979 #endif
4980 #ifdef INET6
4981 free(ip6, M_TEMP);
4982 #endif
4983 return (error);
4984 }
4985
4986 SYSCTL_OID(_security_jail, OID_AUTO, list,
4987 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4988 sysctl_jail_list, "S", "List of active jails");
4989
4990 static int
sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)4991 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
4992 {
4993 int error, injail;
4994
4995 injail = jailed(req->td->td_ucred);
4996 error = SYSCTL_OUT(req, &injail, sizeof(injail));
4997
4998 return (error);
4999 }
5000
5001 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
5002 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
5003 sysctl_jail_jailed, "I", "Process in jail?");
5004
5005 static int
sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)5006 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
5007 {
5008 int error, havevnet;
5009 #ifdef VIMAGE
5010 struct ucred *cred = req->td->td_ucred;
5011
5012 havevnet = jailed(cred) && prison_owns_vnet(cred->cr_prison);
5013 #else
5014 havevnet = 0;
5015 #endif
5016 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
5017
5018 return (error);
5019 }
5020
5021 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
5022 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
5023 sysctl_jail_vnet, "I", "Jail owns vnet?");
5024
5025 #if defined(INET) || defined(INET6)
5026 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
5027 &jail_max_af_ips, 0,
5028 "Number of IP addresses a jail may have at most per address family (deprecated)");
5029 #endif
5030
5031 /*
5032 * Default parameters for jail(2) compatibility. For historical reasons,
5033 * the sysctl names have varying similarity to the parameter names. Prisons
5034 * just see their own parameters, and can't change them.
5035 */
5036 static int
sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)5037 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
5038 {
5039 int error, i;
5040
5041 /* Get the current flag value, and convert it to a boolean. */
5042 if (req->td->td_ucred->cr_prison == &prison0) {
5043 mtx_lock(&prison0.pr_mtx);
5044 i = (jail_default_allow & arg2) != 0;
5045 mtx_unlock(&prison0.pr_mtx);
5046 } else
5047 i = prison_allow(req->td->td_ucred, arg2);
5048
5049 if (arg1 != NULL)
5050 i = !i;
5051 error = sysctl_handle_int(oidp, &i, 0, req);
5052 if (error || !req->newptr)
5053 return (error);
5054 i = i ? arg2 : 0;
5055 if (arg1 != NULL)
5056 i ^= arg2;
5057 /*
5058 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
5059 * for writing.
5060 */
5061 mtx_lock(&prison0.pr_mtx);
5062 jail_default_allow = (jail_default_allow & ~arg2) | i;
5063 mtx_unlock(&prison0.pr_mtx);
5064 return (0);
5065 }
5066
5067 /*
5068 * Do not add more here. Use SYSCTL_JAIL_PARAM (allow flags for jails)
5069 * instead.
5070 */
5071 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
5072 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
5073 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
5074 "Processes in jail can set their hostnames (deprecated)");
5075 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
5076 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
5077 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
5078 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)");
5079 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
5080 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
5081 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
5082 "Processes in jail can use System V IPC primitives (deprecated)");
5083 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
5084 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
5085 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
5086 "Prison root can create raw sockets (deprecated)");
5087 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
5088 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
5089 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
5090 "Processes in jail can alter system file flags (deprecated)");
5091 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
5092 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
5093 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
5094 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)");
5095 SYSCTL_PROC(_security_jail, OID_AUTO, mlock_allowed,
5096 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
5097 NULL, PR_ALLOW_MLOCK, sysctl_jail_default_allow, "I",
5098 "Processes in jail can lock/unlock physical pages in memory (deprecated)");
5099
5100 static int
sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)5101 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
5102 {
5103 struct prison *pr;
5104 int level, error;
5105
5106 pr = req->td->td_ucred->cr_prison;
5107 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
5108 error = sysctl_handle_int(oidp, &level, 0, req);
5109 if (error || !req->newptr)
5110 return (error);
5111 *(int *)arg1 = level;
5112 return (0);
5113 }
5114
5115 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
5116 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
5117 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
5118 sysctl_jail_default_level, "I",
5119 "Processes in jail cannot see all mounted file systems (deprecated)");
5120
5121 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
5122 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
5123 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
5124 sysctl_jail_default_level, "I",
5125 "Ruleset for the devfs filesystem in jail (deprecated)");
5126
5127 SYSCTL_NODE(_security_jail, OID_AUTO, children, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
5128 "Limits and stats of child jails");
5129
5130 static int
sysctl_jail_children(SYSCTL_HANDLER_ARGS)5131 sysctl_jail_children(SYSCTL_HANDLER_ARGS)
5132 {
5133 struct prison *pr;
5134 int i;
5135
5136 pr = req->td->td_ucred->cr_prison;
5137
5138 switch (oidp->oid_kind & CTLTYPE) {
5139 case CTLTYPE_INT:
5140 i = *(int *)((char *)pr + arg2);
5141 return (SYSCTL_OUT(req, &i, sizeof(i)));
5142 }
5143
5144 return (0);
5145 }
5146
5147 SYSCTL_PROC(_security_jail_children, OID_AUTO, max,
5148 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
5149 NULL, offsetof(struct prison, pr_childmax), sysctl_jail_children,
5150 "I", "Maximum number of child jails");
5151 SYSCTL_PROC(_security_jail_children, OID_AUTO, cur,
5152 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
5153 NULL, offsetof(struct prison, pr_childcount), sysctl_jail_children,
5154 "I", "Current number of child jails");
5155
5156 /*
5157 * Nodes to describe jail parameters. Maximum length of string parameters
5158 * is returned in the string itself, and the other parameters exist merely
5159 * to make themselves and their types known.
5160 */
5161 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
5162 "Jail parameters");
5163
5164 int
sysctl_jail_param(SYSCTL_HANDLER_ARGS)5165 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
5166 {
5167 int i;
5168 long l;
5169 size_t s;
5170 char numbuf[12];
5171
5172 switch (oidp->oid_kind & CTLTYPE)
5173 {
5174 case CTLTYPE_LONG:
5175 case CTLTYPE_ULONG:
5176 l = 0;
5177 #ifdef SCTL_MASK32
5178 if (!(req->flags & SCTL_MASK32))
5179 #endif
5180 return (SYSCTL_OUT(req, &l, sizeof(l)));
5181 case CTLTYPE_INT:
5182 case CTLTYPE_UINT:
5183 i = 0;
5184 return (SYSCTL_OUT(req, &i, sizeof(i)));
5185 case CTLTYPE_STRING:
5186 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
5187 return
5188 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
5189 case CTLTYPE_STRUCT:
5190 s = (size_t)arg2;
5191 return (SYSCTL_OUT(req, &s, sizeof(s)));
5192 }
5193 return (0);
5194 }
5195
5196 /*
5197 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at
5198 * jail creation time but cannot be changed in an existing jail.
5199 */
5200 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
5201 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
5202 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
5203 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
5204 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
5205 "I", "Jail secure level");
5206 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I",
5207 "Jail value for kern.osreldate and uname -K");
5208 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN,
5209 "Jail value for kern.osrelease and uname -r");
5210 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
5211 "I", "Jail cannot see all mounted file systems");
5212 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
5213 "I", "Ruleset for in-jail devfs mounts");
5214 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
5215 "B", "Jail persistence");
5216 #ifdef VIMAGE
5217 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
5218 "E,jailsys", "Virtual network stack");
5219 #endif
5220 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
5221 "B", "Jail is in the process of shutting down");
5222
5223 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
5224 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
5225 "I", "Current number of child jails");
5226 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
5227 "I", "Maximum number of child jails");
5228
5229 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
5230 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
5231 "Jail hostname");
5232 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
5233 "Jail NIS domainname");
5234 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
5235 "Jail host UUID");
5236 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
5237 "LU", "Jail host ID");
5238
5239 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
5240 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
5241
5242 #ifdef MAC
5243 SYSCTL_JAIL_PARAM_STRUCT(_mac, label, CTLFLAG_RW, sizeof(struct mac),
5244 "S,mac", "Jail MAC label");
5245 #endif
5246
5247 #ifdef INET
5248 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
5249 "Jail IPv4 address virtualization");
5250 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
5251 "S,in_addr,a", "Jail IPv4 addresses");
5252 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
5253 "B", "Do (not) use IPv4 source address selection rather than the "
5254 "primary jail IPv4 address.");
5255 #endif
5256 #ifdef INET6
5257 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
5258 "Jail IPv6 address virtualization");
5259 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
5260 "S,in6_addr,a", "Jail IPv6 addresses");
5261 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
5262 "B", "Do (not) use IPv6 source address selection rather than the "
5263 "primary jail IPv6 address.");
5264 #endif
5265
5266 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
5267 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
5268 "B", "Jail may set hostname");
5269 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
5270 "B", "Jail may use SYSV IPC");
5271 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
5272 "B", "Jail may create raw sockets");
5273 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
5274 "B", "Jail may alter system file flags");
5275 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
5276 "B", "Jail may set file quotas");
5277 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
5278 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
5279 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW,
5280 "B", "Jail may lock (unlock) physical pages in memory");
5281 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW,
5282 "B", "Jail may bind sockets to reserved ports");
5283 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW,
5284 "B", "Jail may read the kernel message buffer");
5285 SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW,
5286 "B", "Unprivileged processes may use process debugging facilities");
5287 SYSCTL_JAIL_PARAM(_allow, unprivileged_parent_tampering,
5288 CTLTYPE_INT | CTLFLAG_RW, "B",
5289 "Unprivileged parent jail processes may tamper with same-uid processes"
5290 " (signal/debug/cpuset)");
5291 SYSCTL_JAIL_PARAM(_allow, suser, CTLTYPE_INT | CTLFLAG_RW,
5292 "B", "Processes in jail with uid 0 have privilege");
5293 #ifdef VIMAGE
5294 SYSCTL_JAIL_PARAM(_allow, nfsd, CTLTYPE_INT | CTLFLAG_RW,
5295 "B", "Mountd/nfsd may run in the jail");
5296 #endif
5297 SYSCTL_JAIL_PARAM(_allow, extattr, CTLTYPE_INT | CTLFLAG_RW,
5298 "B", "Jail may set system-level filesystem extended attributes");
5299 SYSCTL_JAIL_PARAM(_allow, adjtime, CTLTYPE_INT | CTLFLAG_RW,
5300 "B", "Jail may adjust system time");
5301 SYSCTL_JAIL_PARAM(_allow, settime, CTLTYPE_INT | CTLFLAG_RW,
5302 "B", "Jail may set system time");
5303 SYSCTL_JAIL_PARAM(_allow, routing, CTLTYPE_INT | CTLFLAG_RW,
5304 "B", "Jail may modify routing table");
5305 #ifdef AUDIT
5306 SYSCTL_JAIL_PARAM(_allow, setaudit, CTLTYPE_INT | CTLFLAG_RW,
5307 "B", "Jail may set and get audit session state");
5308 #endif
5309
5310 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
5311 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
5312 "B", "Jail may mount/unmount jail-friendly file systems in general");
5313
5314 /*
5315 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return
5316 * its associated bit in the pr_allow bitmask, or zero if the parameter was
5317 * not created.
5318 */
5319 unsigned
prison_add_allow(const char * prefix,const char * name,const char * prefix_descr,const char * descr)5320 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr,
5321 const char *descr)
5322 {
5323 struct bool_flags *bf;
5324 struct sysctl_oid *parent;
5325 char *allow_name, *allow_noname, *allowed;
5326 #ifndef NO_SYSCTL_DESCR
5327 char *descr_deprecated;
5328 #endif
5329 u_int allow_flag;
5330
5331 if (prefix
5332 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name)
5333 < 0 ||
5334 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name)
5335 < 0
5336 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 ||
5337 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) {
5338 free(allow_name, M_PRISON);
5339 return 0;
5340 }
5341
5342 /*
5343 * See if this parameter has already beed added, i.e. a module was
5344 * previously loaded/unloaded.
5345 */
5346 mtx_lock(&prison0.pr_mtx);
5347 for (bf = pr_flag_allow;
5348 bf < pr_flag_allow + nitems(pr_flag_allow) &&
5349 atomic_load_int(&bf->flag) != 0;
5350 bf++) {
5351 if (strcmp(bf->name, allow_name) == 0) {
5352 allow_flag = bf->flag;
5353 goto no_add;
5354 }
5355 }
5356
5357 /*
5358 * Find a free bit in pr_allow_all, failing if there are none
5359 * (which shouldn't happen as long as we keep track of how many
5360 * potential dynamic flags exist).
5361 */
5362 for (allow_flag = 1;; allow_flag <<= 1) {
5363 if (allow_flag == 0)
5364 goto no_add;
5365 if ((pr_allow_all & allow_flag) == 0)
5366 break;
5367 }
5368
5369 /* Note the parameter in the next open slot in pr_flag_allow. */
5370 for (bf = pr_flag_allow; ; bf++) {
5371 if (bf == pr_flag_allow + nitems(pr_flag_allow)) {
5372 /* This should never happen, but is not fatal. */
5373 allow_flag = 0;
5374 goto no_add;
5375 }
5376 if (atomic_load_int(&bf->flag) == 0)
5377 break;
5378 }
5379 bf->name = allow_name;
5380 bf->noname = allow_noname;
5381 pr_allow_all |= allow_flag;
5382 /*
5383 * prison0 always has permission for the new parameter.
5384 * Other jails must have it granted to them.
5385 */
5386 prison0.pr_allow |= allow_flag;
5387 /* The flag indicates a valid entry, so make sure it is set last. */
5388 atomic_store_rel_int(&bf->flag, allow_flag);
5389 mtx_unlock(&prison0.pr_mtx);
5390
5391 /*
5392 * Create sysctls for the parameter, and the back-compat global
5393 * permission.
5394 */
5395 parent = prefix
5396 ? SYSCTL_ADD_NODE(NULL,
5397 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow),
5398 OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr)
5399 : &sysctl___security_jail_param_allow;
5400 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO,
5401 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
5402 NULL, 0, sysctl_jail_param, "B", descr);
5403 if ((prefix
5404 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name)
5405 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) {
5406 #ifndef NO_SYSCTL_DESCR
5407 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)",
5408 descr);
5409 #endif
5410 (void)SYSCTL_ADD_PROC(NULL,
5411 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed,
5412 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag,
5413 sysctl_jail_default_allow, "I", descr_deprecated);
5414 #ifndef NO_SYSCTL_DESCR
5415 free(descr_deprecated, M_TEMP);
5416 #endif
5417 free(allowed, M_TEMP);
5418 }
5419 return allow_flag;
5420
5421 no_add:
5422 mtx_unlock(&prison0.pr_mtx);
5423 free(allow_name, M_PRISON);
5424 free(allow_noname, M_PRISON);
5425 return allow_flag;
5426 }
5427
5428 /*
5429 * The VFS system will register jail-aware filesystems here. They each get
5430 * a parameter allow.mount.xxxfs and a flag to check when a jailed user
5431 * attempts to mount.
5432 */
5433 void
prison_add_vfs(struct vfsconf * vfsp)5434 prison_add_vfs(struct vfsconf *vfsp)
5435 {
5436 #ifdef NO_SYSCTL_DESCR
5437
5438 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
5439 NULL, NULL);
5440 #else
5441 char *descr;
5442
5443 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system",
5444 vfsp->vfc_name);
5445 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
5446 NULL, descr);
5447 free(descr, M_TEMP);
5448 #endif
5449 }
5450
5451 #ifdef RACCT
5452 void
prison_racct_foreach(void (* callback)(struct racct * racct,void * arg2,void * arg3),void (* pre)(void),void (* post)(void),void * arg2,void * arg3)5453 prison_racct_foreach(void (*callback)(struct racct *racct,
5454 void *arg2, void *arg3), void (*pre)(void), void (*post)(void),
5455 void *arg2, void *arg3)
5456 {
5457 struct prison_racct *prr;
5458
5459 ASSERT_RACCT_ENABLED();
5460
5461 sx_slock(&allprison_lock);
5462 if (pre != NULL)
5463 (pre)();
5464 LIST_FOREACH(prr, &allprison_racct, prr_next)
5465 (callback)(prr->prr_racct, arg2, arg3);
5466 if (post != NULL)
5467 (post)();
5468 sx_sunlock(&allprison_lock);
5469 }
5470
5471 static struct prison_racct *
prison_racct_find_locked(const char * name)5472 prison_racct_find_locked(const char *name)
5473 {
5474 struct prison_racct *prr;
5475
5476 ASSERT_RACCT_ENABLED();
5477 sx_assert(&allprison_lock, SA_XLOCKED);
5478
5479 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
5480 return (NULL);
5481
5482 LIST_FOREACH(prr, &allprison_racct, prr_next) {
5483 if (strcmp(name, prr->prr_name) != 0)
5484 continue;
5485
5486 /* Found prison_racct with a matching name? */
5487 prison_racct_hold(prr);
5488 return (prr);
5489 }
5490
5491 /* Add new prison_racct. */
5492 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
5493 racct_create(&prr->prr_racct);
5494
5495 strcpy(prr->prr_name, name);
5496 refcount_init(&prr->prr_refcount, 1);
5497 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
5498
5499 return (prr);
5500 }
5501
5502 struct prison_racct *
prison_racct_find(const char * name)5503 prison_racct_find(const char *name)
5504 {
5505 struct prison_racct *prr;
5506
5507 ASSERT_RACCT_ENABLED();
5508
5509 sx_xlock(&allprison_lock);
5510 prr = prison_racct_find_locked(name);
5511 sx_xunlock(&allprison_lock);
5512 return (prr);
5513 }
5514
5515 void
prison_racct_hold(struct prison_racct * prr)5516 prison_racct_hold(struct prison_racct *prr)
5517 {
5518
5519 ASSERT_RACCT_ENABLED();
5520
5521 refcount_acquire(&prr->prr_refcount);
5522 }
5523
5524 static void
prison_racct_free_locked(struct prison_racct * prr)5525 prison_racct_free_locked(struct prison_racct *prr)
5526 {
5527
5528 ASSERT_RACCT_ENABLED();
5529 sx_assert(&allprison_lock, SA_XLOCKED);
5530
5531 if (refcount_release(&prr->prr_refcount)) {
5532 racct_destroy(&prr->prr_racct);
5533 LIST_REMOVE(prr, prr_next);
5534 free(prr, M_PRISON_RACCT);
5535 }
5536 }
5537
5538 void
prison_racct_free(struct prison_racct * prr)5539 prison_racct_free(struct prison_racct *prr)
5540 {
5541
5542 ASSERT_RACCT_ENABLED();
5543 sx_assert(&allprison_lock, SA_UNLOCKED);
5544
5545 if (refcount_release_if_not_last(&prr->prr_refcount))
5546 return;
5547
5548 sx_xlock(&allprison_lock);
5549 prison_racct_free_locked(prr);
5550 sx_xunlock(&allprison_lock);
5551 }
5552
5553 static void
prison_racct_attach(struct prison * pr)5554 prison_racct_attach(struct prison *pr)
5555 {
5556 struct prison_racct *prr;
5557
5558 ASSERT_RACCT_ENABLED();
5559 sx_assert(&allprison_lock, SA_XLOCKED);
5560
5561 prr = prison_racct_find_locked(pr->pr_name);
5562 KASSERT(prr != NULL, ("cannot find prison_racct"));
5563
5564 pr->pr_prison_racct = prr;
5565 }
5566
5567 /*
5568 * Handle jail renaming. From the racct point of view, renaming means
5569 * moving from one prison_racct to another.
5570 */
5571 static void
prison_racct_modify(struct prison * pr)5572 prison_racct_modify(struct prison *pr)
5573 {
5574 #ifdef RCTL
5575 struct proc *p;
5576 struct ucred *cred;
5577 #endif
5578 struct prison_racct *oldprr;
5579
5580 ASSERT_RACCT_ENABLED();
5581
5582 sx_slock(&allproc_lock);
5583 sx_xlock(&allprison_lock);
5584
5585 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
5586 sx_xunlock(&allprison_lock);
5587 sx_sunlock(&allproc_lock);
5588 return;
5589 }
5590
5591 oldprr = pr->pr_prison_racct;
5592 pr->pr_prison_racct = NULL;
5593
5594 prison_racct_attach(pr);
5595
5596 /*
5597 * Move resource utilisation records.
5598 */
5599 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
5600
5601 #ifdef RCTL
5602 /*
5603 * Force rctl to reattach rules to processes.
5604 */
5605 FOREACH_PROC_IN_SYSTEM(p) {
5606 PROC_LOCK(p);
5607 cred = crhold(p->p_ucred);
5608 PROC_UNLOCK(p);
5609 rctl_proc_ucred_changed(p, cred);
5610 crfree(cred);
5611 }
5612 #endif
5613
5614 sx_sunlock(&allproc_lock);
5615 prison_racct_free_locked(oldprr);
5616 sx_xunlock(&allprison_lock);
5617 }
5618
5619 static void
prison_racct_detach(struct prison * pr)5620 prison_racct_detach(struct prison *pr)
5621 {
5622
5623 ASSERT_RACCT_ENABLED();
5624 sx_assert(&allprison_lock, SA_UNLOCKED);
5625
5626 if (pr->pr_prison_racct == NULL)
5627 return;
5628 prison_racct_free(pr->pr_prison_racct);
5629 pr->pr_prison_racct = NULL;
5630 }
5631 #endif /* RACCT */
5632
5633 /*
5634 * Submit a knote for a prison, locking if necessary.
5635 */
5636 static void
prison_knote(struct prison * pr,long hint)5637 prison_knote(struct prison *pr, long hint)
5638 {
5639 int locked;
5640
5641 locked = mtx_owned(&pr->pr_mtx);
5642 if (!locked)
5643 mtx_lock(&pr->pr_mtx);
5644 KNOTE_LOCKED(pr->pr_klist, hint);
5645 jaildesc_knote(pr, hint);
5646 if (!locked)
5647 mtx_unlock(&pr->pr_mtx);
5648 }
5649
5650 #ifdef DDB
5651
5652 static void
db_show_prison(struct prison * pr)5653 db_show_prison(struct prison *pr)
5654 {
5655 struct bool_flags *bf;
5656 struct jailsys_flags *jsf;
5657 #if defined(INET) || defined(INET6)
5658 int ii;
5659 struct prison_ip *pip;
5660 #endif
5661 unsigned f;
5662 #ifdef INET
5663 char ip4buf[INET_ADDRSTRLEN];
5664 #endif
5665 #ifdef INET6
5666 char ip6buf[INET6_ADDRSTRLEN];
5667 #endif
5668
5669 db_printf("prison %p:\n", pr);
5670 db_printf(" jid = %d\n", pr->pr_id);
5671 db_printf(" name = %s\n", pr->pr_name);
5672 db_printf(" parent = %p\n", pr->pr_parent);
5673 db_printf(" ref = %d\n", pr->pr_ref);
5674 db_printf(" uref = %d\n", pr->pr_uref);
5675 db_printf(" state = %s\n",
5676 pr->pr_state == PRISON_STATE_ALIVE ? "alive" :
5677 pr->pr_state == PRISON_STATE_DYING ? "dying" :
5678 "invalid");
5679 db_printf(" path = %s\n", pr->pr_path);
5680 db_printf(" cpuset = %d\n", pr->pr_cpuset
5681 ? pr->pr_cpuset->cs_id : -1);
5682 #ifdef VIMAGE
5683 db_printf(" vnet = %p\n", pr->pr_vnet);
5684 #endif
5685 db_printf(" root = %p\n", pr->pr_root);
5686 db_printf(" securelevel = %d\n", pr->pr_securelevel);
5687 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
5688 db_printf(" children.max = %d\n", pr->pr_childmax);
5689 db_printf(" children.cur = %d\n", pr->pr_childcount);
5690 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
5691 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
5692 db_printf(" flags = 0x%x", pr->pr_flags);
5693 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++)
5694 if (pr->pr_flags & bf->flag)
5695 db_printf(" %s", bf->name);
5696 for (jsf = pr_flag_jailsys;
5697 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
5698 jsf++) {
5699 f = pr->pr_flags & (jsf->disable | jsf->new);
5700 db_printf(" %-16s= %s\n", jsf->name,
5701 (f != 0 && f == jsf->disable) ? "disable"
5702 : (f == jsf->new) ? "new"
5703 : "inherit");
5704 }
5705 db_printf(" allow = 0x%x", pr->pr_allow);
5706 for (bf = pr_flag_allow;
5707 bf < pr_flag_allow + nitems(pr_flag_allow) &&
5708 atomic_load_int(&bf->flag) != 0;
5709 bf++)
5710 if (pr->pr_allow & bf->flag)
5711 db_printf(" %s", bf->name);
5712 db_printf("\n");
5713 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
5714 db_printf(" host.hostname = %s\n", pr->pr_hostname);
5715 db_printf(" host.domainname = %s\n", pr->pr_domainname);
5716 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
5717 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
5718 #ifdef INET
5719 if ((pip = pr->pr_addrs[PR_INET]) != NULL) {
5720 db_printf(" ip4s = %d\n", pip->ips);
5721 for (ii = 0; ii < pip->ips; ii++)
5722 db_printf(" %s %s\n",
5723 ii == 0 ? "ip4.addr =" : " ",
5724 inet_ntoa_r(
5725 *(const struct in_addr *)PR_IP(pip, PR_INET, ii),
5726 ip4buf));
5727 }
5728 #endif
5729 #ifdef INET6
5730 if ((pip = pr->pr_addrs[PR_INET6]) != NULL) {
5731 db_printf(" ip6s = %d\n", pip->ips);
5732 for (ii = 0; ii < pip->ips; ii++)
5733 db_printf(" %s %s\n",
5734 ii == 0 ? "ip6.addr =" : " ",
5735 ip6_sprintf(ip6buf,
5736 (const struct in6_addr *)PR_IP(pip, PR_INET6, ii)));
5737 }
5738 #endif
5739 }
5740
DB_SHOW_COMMAND(prison,db_show_prison_command)5741 DB_SHOW_COMMAND(prison, db_show_prison_command)
5742 {
5743 struct prison *pr;
5744
5745 if (!have_addr) {
5746 /*
5747 * Show all prisons in the list, and prison0 which is not
5748 * listed.
5749 */
5750 db_show_prison(&prison0);
5751 if (!db_pager_quit) {
5752 TAILQ_FOREACH(pr, &allprison, pr_list) {
5753 db_show_prison(pr);
5754 if (db_pager_quit)
5755 break;
5756 }
5757 }
5758 return;
5759 }
5760
5761 if (addr == 0)
5762 pr = &prison0;
5763 else {
5764 /* Look for a prison with the ID and with references. */
5765 TAILQ_FOREACH(pr, &allprison, pr_list)
5766 if (pr->pr_id == addr && pr->pr_ref > 0)
5767 break;
5768 if (pr == NULL)
5769 /* Look again, without requiring a reference. */
5770 TAILQ_FOREACH(pr, &allprison, pr_list)
5771 if (pr->pr_id == addr)
5772 break;
5773 if (pr == NULL)
5774 /* Assume address points to a valid prison. */
5775 pr = (struct prison *)addr;
5776 }
5777 db_show_prison(pr);
5778 }
5779
5780 #endif /* DDB */
5781