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