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