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_PRISON0,
119 };
120 _Static_assert((PR_ALLOW_PRISON0 & ~PR_ALLOW_ALL_STATIC) == 0,
121 "Bits enabled in PR_ALLOW_PRISON0 that are not statically reserved");
122
123 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
124
125 struct bool_flags {
126 const char *name;
127 const char *noname;
128 volatile u_int flag;
129 };
130 struct jailsys_flags {
131 const char *name;
132 unsigned disable;
133 unsigned new;
134 };
135
136 /*
137 * Handle jail teardown in a dedicated thread to avoid deadlocks from
138 * vnet_destroy().
139 */
140 TASKQUEUE_DEFINE_THREAD(jail_remove);
141
142 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */
143 struct sx allprison_lock;
144 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
145 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
146 LIST_HEAD(, prison_racct) allprison_racct;
147 int lastprid = 0;
148 int lastdeadid = 0;
149
150 static int get_next_prid(struct prison **insprp);
151 static int get_next_deadid(struct prison **insprp);
152 static int do_jail_attach(struct thread *td, struct prison *pr, int drflags);
153 static void prison_complete(void *context, int pending);
154 static void prison_deref(struct prison *pr, int flags);
155 static void prison_deref_kill(struct prison *pr, struct prisonlist *freeprison);
156 static int prison_lock_xlock(struct prison *pr, int flags);
157 static void prison_cleanup(struct prison *pr);
158 static void prison_free_not_last(struct prison *pr);
159 static void prison_proc_free_not_last(struct prison *pr);
160 static void prison_proc_relink(struct prison *opr, struct prison *npr,
161 struct proc *p);
162 static void prison_set_allow_locked(struct prison *pr, unsigned flag,
163 int enable);
164 static char *prison_path(struct prison *pr1, struct prison *pr2);
165 #ifdef RACCT
166 static void prison_racct_attach(struct prison *pr);
167 static void prison_racct_modify(struct prison *pr);
168 static void prison_racct_detach(struct prison *pr);
169 #endif
170
171 /* Flags for prison_deref */
172 #define PD_DEREF 0x01 /* Decrement pr_ref */
173 #define PD_DEUREF 0x02 /* Decrement pr_uref */
174 #define PD_KILL 0x04 /* Remove jail, kill processes, etc */
175 #define PD_LOCKED 0x10 /* pr_mtx is held */
176 #define PD_LIST_SLOCKED 0x20 /* allprison_lock is held shared */
177 #define PD_LIST_XLOCKED 0x40 /* allprison_lock is held exclusive */
178 #define PD_OP_FLAGS 0x07 /* Operation flags */
179 #define PD_LOCK_FLAGS 0x70 /* Lock status flags */
180
181 /*
182 * Parameter names corresponding to PR_* flag values. Size values are for kvm
183 * as we cannot figure out the size of a sparse array, or an array without a
184 * terminating entry.
185 */
186 static struct bool_flags pr_flag_bool[] = {
187 {"persist", "nopersist", PR_PERSIST},
188 #ifdef INET
189 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL},
190 #endif
191 #ifdef INET6
192 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL},
193 #endif
194 };
195 const size_t pr_flag_bool_size = sizeof(pr_flag_bool);
196
197 static struct jailsys_flags pr_flag_jailsys[] = {
198 {"host", 0, PR_HOST},
199 #ifdef VIMAGE
200 {"vnet", 0, PR_VNET},
201 #endif
202 #ifdef INET
203 {"ip4", PR_IP4_USER, PR_IP4_USER},
204 #endif
205 #ifdef INET6
206 {"ip6", PR_IP6_USER, PR_IP6_USER},
207 #endif
208 };
209 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
210
211 /*
212 * Make this array full-size so dynamic parameters can be added.
213 * It is protected by prison0.mtx, but lockless reading is allowed
214 * with an atomic check of the flag values.
215 */
216 static struct bool_flags pr_flag_allow[NBBY * NBPW] = {
217 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME},
218 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC},
219 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS},
220 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS},
221 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT},
222 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS},
223 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF},
224 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK},
225 {"allow.reserved_ports", "allow.noreserved_ports",
226 PR_ALLOW_RESERVED_PORTS},
227 {"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF},
228 {"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug",
229 PR_ALLOW_UNPRIV_DEBUG},
230 {"allow.suser", "allow.nosuser", PR_ALLOW_SUSER},
231 #ifdef VIMAGE
232 {"allow.nfsd", "allow.nonfsd", PR_ALLOW_NFSD},
233 #endif
234 {"allow.extattr", "allow.noextattr", PR_ALLOW_EXTATTR},
235 {"allow.adjtime", "allow.noadjtime", PR_ALLOW_ADJTIME},
236 {"allow.settime", "allow.nosettime", PR_ALLOW_SETTIME},
237 {"allow.routing", "allow.norouting", PR_ALLOW_ROUTING},
238 {"allow.unprivileged_parent_tampering",
239 "allow.nounprivileged_parent_tampering",
240 PR_ALLOW_UNPRIV_PARENT_TAMPER},
241 };
242 static unsigned pr_allow_all = PR_ALLOW_ALL_STATIC;
243 const size_t pr_flag_allow_size = sizeof(pr_flag_allow);
244
245 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \
246 PR_ALLOW_RESERVED_PORTS | \
247 PR_ALLOW_UNPRIV_DEBUG | \
248 PR_ALLOW_SUSER)
249 #define JAIL_DEFAULT_ENFORCE_STATFS 2
250 #define JAIL_DEFAULT_DEVFS_RSNUM 0
251 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
252 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
253 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
254 #if defined(INET) || defined(INET6)
255 static unsigned jail_max_af_ips = 255;
256 #endif
257
258 /*
259 * Initialize the parts of prison0 that can't be static-initialized with
260 * constants. This is called from proc0_init() after creating thread0 cpuset.
261 */
262 void
prison0_init(void)263 prison0_init(void)
264 {
265 uint8_t *file, *data;
266 size_t size;
267 char buf[sizeof(prison0.pr_hostuuid)];
268 bool valid;
269
270 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset);
271 prison0.pr_osreldate = osreldate;
272 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease));
273
274 /* If we have a preloaded hostuuid, use it. */
275 file = preload_search_by_type(PRISON0_HOSTUUID_MODULE);
276 if (file != NULL) {
277 data = preload_fetch_addr(file);
278 size = preload_fetch_size(file);
279 if (data != NULL) {
280 /*
281 * The preloaded data may include trailing whitespace, almost
282 * certainly a newline; skip over any whitespace or
283 * non-printable characters to be safe.
284 */
285 while (size > 0 && data[size - 1] <= 0x20) {
286 size--;
287 }
288
289 valid = false;
290
291 /*
292 * Not NUL-terminated when passed from loader, but
293 * validate_uuid requires that due to using sscanf (as
294 * does the subsequent strlcpy, since it still reads
295 * past the given size to return the true length);
296 * bounce to a temporary buffer to fix.
297 */
298 if (size >= sizeof(buf))
299 goto done;
300
301 memcpy(buf, data, size);
302 buf[size] = '\0';
303
304 if (validate_uuid(buf, size, NULL, 0) != 0)
305 goto done;
306
307 valid = true;
308 (void)strlcpy(prison0.pr_hostuuid, buf,
309 sizeof(prison0.pr_hostuuid));
310
311 done:
312 if (bootverbose && !valid) {
313 printf("hostuuid: preload data malformed: '%.*s'\n",
314 (int)size, data);
315 }
316 }
317 }
318 if (bootverbose)
319 printf("hostuuid: using %s\n", prison0.pr_hostuuid);
320 }
321
322 /*
323 * struct jail_args {
324 * struct jail *jail;
325 * };
326 */
327 int
sys_jail(struct thread * td,struct jail_args * uap)328 sys_jail(struct thread *td, struct jail_args *uap)
329 {
330 uint32_t version;
331 int error;
332 struct jail j;
333
334 error = copyin(uap->jail, &version, sizeof(uint32_t));
335 if (error)
336 return (error);
337
338 switch (version) {
339 case 0:
340 {
341 struct jail_v0 j0;
342
343 /* FreeBSD single IPv4 jails. */
344 bzero(&j, sizeof(struct jail));
345 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
346 if (error)
347 return (error);
348 j.version = j0.version;
349 j.path = j0.path;
350 j.hostname = j0.hostname;
351 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */
352 break;
353 }
354
355 case 1:
356 /*
357 * Version 1 was used by multi-IPv4 jail implementations
358 * that never made it into the official kernel.
359 */
360 return (EINVAL);
361
362 case 2: /* JAIL_API_VERSION */
363 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
364 error = copyin(uap->jail, &j, sizeof(struct jail));
365 if (error)
366 return (error);
367 break;
368
369 default:
370 /* Sci-Fi jails are not supported, sorry. */
371 return (EINVAL);
372 }
373 return (kern_jail(td, &j));
374 }
375
376 int
kern_jail(struct thread * td,struct jail * j)377 kern_jail(struct thread *td, struct jail *j)
378 {
379 struct iovec optiov[2 * (4 + nitems(pr_flag_allow)
380 #ifdef INET
381 + 1
382 #endif
383 #ifdef INET6
384 + 1
385 #endif
386 )];
387 struct uio opt;
388 char *u_path, *u_hostname, *u_name;
389 struct bool_flags *bf;
390 #ifdef INET
391 uint32_t ip4s;
392 struct in_addr *u_ip4;
393 #endif
394 #ifdef INET6
395 struct in6_addr *u_ip6;
396 #endif
397 size_t tmplen;
398 int error, enforce_statfs;
399
400 bzero(&optiov, sizeof(optiov));
401 opt.uio_iov = optiov;
402 opt.uio_iovcnt = 0;
403 opt.uio_offset = -1;
404 opt.uio_resid = -1;
405 opt.uio_segflg = UIO_SYSSPACE;
406 opt.uio_rw = UIO_READ;
407 opt.uio_td = td;
408
409 /* Set permissions for top-level jails from sysctls. */
410 if (!jailed(td->td_ucred)) {
411 for (bf = pr_flag_allow;
412 bf < pr_flag_allow + nitems(pr_flag_allow) &&
413 atomic_load_int(&bf->flag) != 0;
414 bf++) {
415 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *,
416 (jail_default_allow & bf->flag)
417 ? bf->name : bf->noname);
418 optiov[opt.uio_iovcnt].iov_len =
419 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
420 opt.uio_iovcnt += 2;
421 }
422 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
423 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
424 opt.uio_iovcnt++;
425 enforce_statfs = jail_default_enforce_statfs;
426 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
427 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
428 opt.uio_iovcnt++;
429 }
430
431 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
432 #ifdef INET
433 ip4s = (j->version == 0) ? 1 : j->ip4s;
434 if (ip4s > jail_max_af_ips)
435 return (EINVAL);
436 tmplen += ip4s * sizeof(struct in_addr);
437 #else
438 if (j->ip4s > 0)
439 return (EINVAL);
440 #endif
441 #ifdef INET6
442 if (j->ip6s > jail_max_af_ips)
443 return (EINVAL);
444 tmplen += j->ip6s * sizeof(struct in6_addr);
445 #else
446 if (j->ip6s > 0)
447 return (EINVAL);
448 #endif
449 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
450 u_hostname = u_path + MAXPATHLEN;
451 u_name = u_hostname + MAXHOSTNAMELEN;
452 #ifdef INET
453 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
454 #endif
455 #ifdef INET6
456 #ifdef INET
457 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
458 #else
459 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
460 #endif
461 #endif
462 optiov[opt.uio_iovcnt].iov_base = "path";
463 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
464 opt.uio_iovcnt++;
465 optiov[opt.uio_iovcnt].iov_base = u_path;
466 error = copyinstr(j->path, u_path, MAXPATHLEN,
467 &optiov[opt.uio_iovcnt].iov_len);
468 if (error) {
469 free(u_path, M_TEMP);
470 return (error);
471 }
472 opt.uio_iovcnt++;
473 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
474 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
475 opt.uio_iovcnt++;
476 optiov[opt.uio_iovcnt].iov_base = u_hostname;
477 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
478 &optiov[opt.uio_iovcnt].iov_len);
479 if (error) {
480 free(u_path, M_TEMP);
481 return (error);
482 }
483 opt.uio_iovcnt++;
484 if (j->jailname != NULL) {
485 optiov[opt.uio_iovcnt].iov_base = "name";
486 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
487 opt.uio_iovcnt++;
488 optiov[opt.uio_iovcnt].iov_base = u_name;
489 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
490 &optiov[opt.uio_iovcnt].iov_len);
491 if (error) {
492 free(u_path, M_TEMP);
493 return (error);
494 }
495 opt.uio_iovcnt++;
496 }
497 #ifdef INET
498 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
499 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
500 opt.uio_iovcnt++;
501 optiov[opt.uio_iovcnt].iov_base = u_ip4;
502 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
503 if (j->version == 0)
504 u_ip4->s_addr = j->ip4s;
505 else {
506 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
507 if (error) {
508 free(u_path, M_TEMP);
509 return (error);
510 }
511 }
512 opt.uio_iovcnt++;
513 #endif
514 #ifdef INET6
515 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
516 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
517 opt.uio_iovcnt++;
518 optiov[opt.uio_iovcnt].iov_base = u_ip6;
519 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
520 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
521 if (error) {
522 free(u_path, M_TEMP);
523 return (error);
524 }
525 opt.uio_iovcnt++;
526 #endif
527 KASSERT(opt.uio_iovcnt <= nitems(optiov),
528 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
529 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
530 free(u_path, M_TEMP);
531 return (error);
532 }
533
534 /*
535 * struct jail_set_args {
536 * struct iovec *iovp;
537 * unsigned int iovcnt;
538 * int flags;
539 * };
540 */
541 int
sys_jail_set(struct thread * td,struct jail_set_args * uap)542 sys_jail_set(struct thread *td, struct jail_set_args *uap)
543 {
544 struct uio *auio;
545 int error;
546
547 /* Check that we have an even number of iovecs. */
548 if (uap->iovcnt & 1)
549 return (EINVAL);
550
551 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
552 if (error)
553 return (error);
554 error = kern_jail_set(td, auio, uap->flags);
555 freeuio(auio);
556 return (error);
557 }
558
559 #if defined(INET) || defined(INET6)
560 typedef int prison_addr_cmp_t(const void *, const void *);
561 typedef bool prison_addr_valid_t(const void *);
562 static const struct pr_family {
563 size_t size;
564 prison_addr_cmp_t *cmp;
565 prison_addr_valid_t *valid;
566 int ip_flag;
567 } pr_families[PR_FAMILY_MAX] = {
568 #ifdef INET
569 [PR_INET] = {
570 .size = sizeof(struct in_addr),
571 .cmp = prison_qcmp_v4,
572 .valid = prison_valid_v4,
573 .ip_flag = PR_IP4_USER,
574 },
575 #endif
576 #ifdef INET6
577 [PR_INET6] = {
578 .size = sizeof(struct in6_addr),
579 .cmp = prison_qcmp_v6,
580 .valid = prison_valid_v6,
581 .ip_flag = PR_IP6_USER,
582 },
583 #endif
584 };
585
586 /*
587 * Network address lists (pr_addrs) allocation for jails. The addresses
588 * are accessed locklessly by the network stack, thus need to be protected by
589 * the network epoch.
590 */
591 struct prison_ip {
592 struct epoch_context ctx;
593 uint32_t ips;
594 #ifdef FUTURE_C
595 /*
596 * XXX Variable-length automatic arrays in union may be
597 * supported in future C.
598 */
599 union {
600 char pr_ip[];
601 struct in_addr pr_ip4[];
602 struct in6_addr pr_ip6[];
603 };
604 #else /* No future C :( */
605 char pr_ip[];
606 #endif
607 };
608
609 static char *
PR_IP(struct prison_ip * pip,const pr_family_t af,int idx)610 PR_IP(struct prison_ip *pip, const pr_family_t af, int idx)
611 {
612 MPASS(pip);
613 MPASS(af < PR_FAMILY_MAX);
614 MPASS(idx >= 0 && idx < pip->ips);
615
616 return (pip->pr_ip + pr_families[af].size * idx);
617 }
618
619 static struct prison_ip *
prison_ip_alloc(const pr_family_t af,uint32_t cnt,int flags)620 prison_ip_alloc(const pr_family_t af, uint32_t cnt, int flags)
621 {
622 struct prison_ip *pip;
623
624 pip = malloc(sizeof(struct prison_ip) + cnt * pr_families[af].size,
625 M_PRISON, flags);
626 if (pip != NULL)
627 pip->ips = cnt;
628 return (pip);
629 }
630
631 /*
632 * Allocate and copyin user supplied address list, sorting and validating.
633 * kern_jail_set() helper.
634 */
635 static struct prison_ip *
prison_ip_copyin(const pr_family_t af,void * op,uint32_t cnt)636 prison_ip_copyin(const pr_family_t af, void *op, uint32_t cnt)
637 {
638 prison_addr_cmp_t *const cmp = pr_families[af].cmp;
639 const size_t size = pr_families[af].size;
640 struct prison_ip *pip;
641
642 pip = prison_ip_alloc(af, cnt, M_WAITOK);
643 bcopy(op, pip->pr_ip, cnt * size);
644 /*
645 * IP addresses are all sorted but ip[0] to preserve
646 * the primary IP address as given from userland.
647 * This special IP is used for unbound outgoing
648 * connections as well for "loopback" traffic in case
649 * source address selection cannot find any more fitting
650 * address to connect from.
651 */
652 if (cnt > 1)
653 qsort(PR_IP(pip, af, 1), cnt - 1, size, cmp);
654 /*
655 * Check for duplicate addresses and do some simple
656 * zero and broadcast checks. If users give other bogus
657 * addresses it is their problem.
658 */
659 for (int i = 0; i < cnt; i++) {
660 if (!pr_families[af].valid(PR_IP(pip, af, i))) {
661 free(pip, M_PRISON);
662 return (NULL);
663 }
664 if (i + 1 < cnt &&
665 (cmp(PR_IP(pip, af, 0), PR_IP(pip, af, i + 1)) == 0 ||
666 cmp(PR_IP(pip, af, i), PR_IP(pip, af, i + 1)) == 0)) {
667 free(pip, M_PRISON);
668 return (NULL);
669 }
670 }
671
672 return (pip);
673 }
674
675 /*
676 * Allocate and dup parent prison address list.
677 * kern_jail_set() helper.
678 */
679 static void
prison_ip_dup(struct prison * ppr,struct prison * pr,const pr_family_t af)680 prison_ip_dup(struct prison *ppr, struct prison *pr, const pr_family_t af)
681 {
682 const struct prison_ip *ppip = ppr->pr_addrs[af];
683 struct prison_ip *pip;
684
685 if (ppip != NULL) {
686 pip = prison_ip_alloc(af, ppip->ips, M_WAITOK);
687 bcopy(ppip->pr_ip, pip->pr_ip, pip->ips * pr_families[af].size);
688 pr->pr_addrs[af] = pip;
689 }
690 }
691
692 /*
693 * Make sure the new set of IP addresses is a subset of the parent's list.
694 * Don't worry about the parent being unlocked, as any setting is done with
695 * allprison_lock held.
696 * kern_jail_set() helper.
697 */
698 static bool
prison_ip_parent_match(struct prison_ip * ppip,struct prison_ip * pip,const pr_family_t af)699 prison_ip_parent_match(struct prison_ip *ppip, struct prison_ip *pip,
700 const pr_family_t af)
701 {
702 prison_addr_cmp_t *const cmp = pr_families[af].cmp;
703 int i, j;
704
705 if (ppip == NULL)
706 return (false);
707
708 for (i = 0; i < ppip->ips; i++)
709 if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, i)) == 0)
710 break;
711
712 if (i == ppip->ips)
713 /* Main address not present in parent. */
714 return (false);
715
716 if (pip->ips > 1) {
717 for (i = j = 1; i < pip->ips; i++) {
718 if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0)
719 /* Equals to parent primary address. */
720 continue;
721 for (; j < ppip->ips; j++)
722 if (cmp(PR_IP(pip, af, i),
723 PR_IP(ppip, af, j)) == 0)
724 break;
725 if (j == ppip->ips)
726 break;
727 }
728 if (j == ppip->ips)
729 /* Address not present in parent. */
730 return (false);
731 }
732 return (true);
733 }
734
735 /*
736 * Check for conflicting IP addresses. We permit them if there is no more
737 * than one IP on each jail. If there is a duplicate on a jail with more
738 * than one IP stop checking and return error.
739 * kern_jail_set() helper.
740 */
741 static bool
prison_ip_conflict_check(const struct prison * ppr,const struct prison * pr,struct prison_ip * pip,pr_family_t af)742 prison_ip_conflict_check(const struct prison *ppr, const struct prison *pr,
743 struct prison_ip *pip, pr_family_t af)
744 {
745 const struct prison *tppr, *tpr;
746 int descend;
747
748 #ifdef VIMAGE
749 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent)
750 if (tppr->pr_flags & PR_VNET)
751 break;
752 #else
753 tppr = &prison0;
754 #endif
755 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
756 if (tpr == pr ||
757 #ifdef VIMAGE
758 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
759 #endif
760 !prison_isalive(tpr)) {
761 descend = 0;
762 continue;
763 }
764 if (!(tpr->pr_flags & pr_families[af].ip_flag))
765 continue;
766 descend = 0;
767 if (tpr->pr_addrs[af] == NULL ||
768 (pip->ips == 1 && tpr->pr_addrs[af]->ips == 1))
769 continue;
770 for (int i = 0; i < pip->ips; i++)
771 if (prison_ip_check(tpr, af, PR_IP(pip, af, i)) == 0)
772 return (false);
773 }
774
775 return (true);
776 }
777
778 _Static_assert(offsetof(struct prison_ip, ctx) == 0,
779 "prison must start with epoch context");
780 static void
prison_ip_free_deferred(epoch_context_t ctx)781 prison_ip_free_deferred(epoch_context_t ctx)
782 {
783
784 free(ctx, M_PRISON);
785 }
786
787 static void
prison_ip_free(struct prison_ip * pip)788 prison_ip_free(struct prison_ip *pip)
789 {
790
791 if (pip != NULL)
792 NET_EPOCH_CALL(prison_ip_free_deferred, &pip->ctx);
793 }
794
795 static void
prison_ip_set(struct prison * pr,const pr_family_t af,struct prison_ip * new)796 prison_ip_set(struct prison *pr, const pr_family_t af, struct prison_ip *new)
797 {
798 struct prison_ip **mem, *old;
799
800 mtx_assert(&pr->pr_mtx, MA_OWNED);
801
802 mem = &pr->pr_addrs[af];
803
804 old = *mem;
805 atomic_store_ptr(mem, new);
806 prison_ip_free(old);
807 }
808
809 /*
810 * Restrict a prison's IP address list with its parent's, possibly replacing
811 * it. Return true if succeed, otherwise should redo.
812 * kern_jail_set() helper.
813 */
814 static bool
prison_ip_restrict(struct prison * pr,const pr_family_t af,struct prison_ip ** newp)815 prison_ip_restrict(struct prison *pr, const pr_family_t af,
816 struct prison_ip **newp)
817 {
818 struct prison_ip *ppip = pr->pr_parent->pr_addrs[af];
819 struct prison_ip *pip = pr->pr_addrs[af];
820 int (*const cmp)(const void *, const void *) = pr_families[af].cmp;
821 const size_t size = pr_families[af].size;
822 struct prison_ip *new = newp != NULL ? *newp : NULL;
823 uint32_t ips;
824
825 mtx_assert(&pr->pr_mtx, MA_OWNED);
826
827 /*
828 * Due to epoch-synchronized access to the IP address lists we always
829 * allocate a new list even if the old one has enough space. We could
830 * atomically update an IPv4 address inside a list, but that would
831 * screw up sorting, and in case of IPv6 we can't even atomically write
832 * one.
833 */
834 if (ppip == NULL) {
835 if (pip != NULL)
836 prison_ip_set(pr, af, NULL);
837 return (true);
838 }
839
840 if (!(pr->pr_flags & pr_families[af].ip_flag)) {
841 if (new == NULL) {
842 new = prison_ip_alloc(af, ppip->ips, M_NOWAIT);
843 if (new == NULL)
844 return (false); /* Redo */
845 }
846 /* This has no user settings, so just copy the parent's list. */
847 MPASS(new->ips == ppip->ips);
848 bcopy(ppip->pr_ip, new->pr_ip, ppip->ips * size);
849 prison_ip_set(pr, af, new);
850 if (newp != NULL)
851 *newp = NULL; /* Used */
852 } else if (pip != NULL) {
853 /* Remove addresses that aren't in the parent. */
854 int i;
855
856 i = 0; /* index in pip */
857 ips = 0; /* index in new */
858
859 if (new == NULL) {
860 new = prison_ip_alloc(af, pip->ips, M_NOWAIT);
861 if (new == NULL)
862 return (false); /* Redo */
863 }
864
865 for (int pi = 0; pi < ppip->ips; pi++)
866 if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, pi)) == 0) {
867 /* Found our primary address in parent. */
868 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips),
869 size);
870 i++;
871 ips++;
872 break;
873 }
874 for (int pi = 1; i < pip->ips; ) {
875 /* Check against primary, which is unsorted. */
876 if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0) {
877 /* Matches parent's primary address. */
878 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips),
879 size);
880 i++;
881 ips++;
882 continue;
883 }
884 /* The rest are sorted. */
885 switch (pi >= ppip->ips ? -1 :
886 cmp(PR_IP(pip, af, i), PR_IP(ppip, af, pi))) {
887 case -1:
888 i++;
889 break;
890 case 0:
891 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips),
892 size);
893 i++;
894 pi++;
895 ips++;
896 break;
897 case 1:
898 pi++;
899 break;
900 }
901 }
902 if (ips == 0) {
903 if (newp == NULL || *newp == NULL)
904 prison_ip_free(new);
905 new = NULL;
906 } else {
907 /* Shrink to real size */
908 KASSERT((new->ips >= ips),
909 ("Out-of-bounds write to prison_ip %p", new));
910 new->ips = ips;
911 }
912 prison_ip_set(pr, af, new);
913 if (newp != NULL)
914 *newp = NULL; /* Used */
915 }
916 return (true);
917 }
918
919 /*
920 * Fast-path check if an address belongs to a prison.
921 */
922 int
prison_ip_check(const struct prison * pr,const pr_family_t af,const void * addr)923 prison_ip_check(const struct prison *pr, const pr_family_t af,
924 const void *addr)
925 {
926 int (*const cmp)(const void *, const void *) = pr_families[af].cmp;
927 struct prison_ip *pip;
928 int i, a, z, d;
929
930 MPASS(mtx_owned(&pr->pr_mtx) ||
931 in_epoch(net_epoch_preempt) ||
932 sx_xlocked(&allprison_lock));
933
934 pip = atomic_load_ptr(&pr->pr_addrs[af]);
935 if (__predict_false(pip == NULL))
936 return (EAFNOSUPPORT);
937
938 /* Check the primary IP. */
939 if (cmp(PR_IP(pip, af, 0), addr) == 0)
940 return (0);
941
942 /*
943 * All the other IPs are sorted so we can do a binary search.
944 */
945 a = 0;
946 z = pip->ips - 2;
947 while (a <= z) {
948 i = (a + z) / 2;
949 d = cmp(PR_IP(pip, af, i + 1), addr);
950 if (d > 0)
951 z = i - 1;
952 else if (d < 0)
953 a = i + 1;
954 else
955 return (0);
956 }
957
958 return (EADDRNOTAVAIL);
959 }
960
961 /*
962 * Grab primary IP. Historically required mutex, but nothing prevents
963 * us to support epoch-protected access. Is it used in fast path?
964 * in{6}_jail.c helper
965 */
966 const void *
prison_ip_get0(const struct prison * pr,const pr_family_t af)967 prison_ip_get0(const struct prison *pr, const pr_family_t af)
968 {
969 const struct prison_ip *pip = pr->pr_addrs[af];
970
971 mtx_assert(&pr->pr_mtx, MA_OWNED);
972 MPASS(pip);
973
974 return (pip->pr_ip);
975 }
976
977 u_int
prison_ip_cnt(const struct prison * pr,const pr_family_t af)978 prison_ip_cnt(const struct prison *pr, const pr_family_t af)
979 {
980
981 return (pr->pr_addrs[af]->ips);
982 }
983 #endif /* defined(INET) || defined(INET6) */
984
985 int
kern_jail_set(struct thread * td,struct uio * optuio,int flags)986 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
987 {
988 struct nameidata nd;
989 #ifdef INET
990 struct prison_ip *ip4;
991 #endif
992 #ifdef INET6
993 struct prison_ip *ip6;
994 #endif
995 struct vfsopt *opt;
996 struct vfsoptlist *opts;
997 struct prison *pr, *deadpr, *dinspr, *inspr, *mypr, *ppr, *tpr;
998 struct vnode *root;
999 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
1000 char *g_path, *osrelstr;
1001 struct bool_flags *bf;
1002 struct jailsys_flags *jsf;
1003 #if defined(INET) || defined(INET6)
1004 void *op;
1005 #endif
1006 unsigned long hid;
1007 size_t namelen, onamelen, pnamelen;
1008 int created, cuflags, descend, drflags, enforce;
1009 int error, errmsg_len, errmsg_pos;
1010 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
1011 int deadid, jid, jsys, len, level;
1012 int childmax, osreldt, rsnum, slevel;
1013 #ifdef INET
1014 int ip4s;
1015 bool redo_ip4;
1016 #endif
1017 #ifdef INET6
1018 int ip6s;
1019 bool redo_ip6;
1020 #endif
1021 uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
1022 uint64_t pr_allow_diff;
1023 unsigned tallow;
1024 char numbuf[12];
1025
1026 error = priv_check(td, PRIV_JAIL_SET);
1027 if (!error && (flags & JAIL_ATTACH))
1028 error = priv_check(td, PRIV_JAIL_ATTACH);
1029 if (error)
1030 return (error);
1031 mypr = td->td_ucred->cr_prison;
1032 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
1033 return (EPERM);
1034 if (flags & ~JAIL_SET_MASK)
1035 return (EINVAL);
1036
1037 /*
1038 * Check all the parameters before committing to anything. Not all
1039 * errors can be caught early, but we may as well try. Also, this
1040 * takes care of some expensive stuff (path lookup) before getting
1041 * the allprison lock.
1042 *
1043 * XXX Jails are not filesystems, and jail parameters are not mount
1044 * options. But it makes more sense to re-use the vfsopt code
1045 * than duplicate it under a different name.
1046 */
1047 error = vfs_buildopts(optuio, &opts);
1048 if (error)
1049 return (error);
1050 #ifdef INET
1051 ip4 = NULL;
1052 #endif
1053 #ifdef INET6
1054 ip6 = NULL;
1055 #endif
1056 g_path = NULL;
1057
1058 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
1059 if (!cuflags) {
1060 error = EINVAL;
1061 vfs_opterror(opts, "no valid operation (create or update)");
1062 goto done_errmsg;
1063 }
1064
1065 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
1066 if (error == ENOENT)
1067 jid = 0;
1068 else if (error != 0)
1069 goto done_free;
1070
1071 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
1072 if (error == ENOENT)
1073 gotslevel = 0;
1074 else if (error != 0)
1075 goto done_free;
1076 else
1077 gotslevel = 1;
1078
1079 error =
1080 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
1081 if (error == ENOENT)
1082 gotchildmax = 0;
1083 else if (error != 0)
1084 goto done_free;
1085 else
1086 gotchildmax = 1;
1087
1088 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
1089 if (error == ENOENT)
1090 gotenforce = 0;
1091 else if (error != 0)
1092 goto done_free;
1093 else if (enforce < 0 || enforce > 2) {
1094 error = EINVAL;
1095 goto done_free;
1096 } else
1097 gotenforce = 1;
1098
1099 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
1100 if (error == ENOENT)
1101 gotrsnum = 0;
1102 else if (error != 0)
1103 goto done_free;
1104 else
1105 gotrsnum = 1;
1106
1107 pr_flags = ch_flags = 0;
1108 for (bf = pr_flag_bool;
1109 bf < pr_flag_bool + nitems(pr_flag_bool);
1110 bf++) {
1111 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag);
1112 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag);
1113 }
1114 ch_flags |= pr_flags;
1115 for (jsf = pr_flag_jailsys;
1116 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
1117 jsf++) {
1118 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys));
1119 if (error == ENOENT)
1120 continue;
1121 if (error != 0)
1122 goto done_free;
1123 switch (jsys) {
1124 case JAIL_SYS_DISABLE:
1125 if (!jsf->disable) {
1126 error = EINVAL;
1127 goto done_free;
1128 }
1129 pr_flags |= jsf->disable;
1130 break;
1131 case JAIL_SYS_NEW:
1132 pr_flags |= jsf->new;
1133 break;
1134 case JAIL_SYS_INHERIT:
1135 break;
1136 default:
1137 error = EINVAL;
1138 goto done_free;
1139 }
1140 ch_flags |= jsf->new | jsf->disable;
1141 }
1142 if ((flags & (JAIL_CREATE | JAIL_ATTACH)) == JAIL_CREATE
1143 && !(pr_flags & PR_PERSIST)) {
1144 error = EINVAL;
1145 vfs_opterror(opts, "new jail must persist or attach");
1146 goto done_errmsg;
1147 }
1148 #ifdef VIMAGE
1149 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
1150 error = EINVAL;
1151 vfs_opterror(opts, "vnet cannot be changed after creation");
1152 goto done_errmsg;
1153 }
1154 #endif
1155 #ifdef INET
1156 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
1157 error = EINVAL;
1158 vfs_opterror(opts, "ip4 cannot be changed after creation");
1159 goto done_errmsg;
1160 }
1161 #endif
1162 #ifdef INET6
1163 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
1164 error = EINVAL;
1165 vfs_opterror(opts, "ip6 cannot be changed after creation");
1166 goto done_errmsg;
1167 }
1168 #endif
1169
1170 pr_allow = ch_allow = 0;
1171 for (bf = pr_flag_allow;
1172 bf < pr_flag_allow + nitems(pr_flag_allow) &&
1173 atomic_load_int(&bf->flag) != 0;
1174 bf++) {
1175 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag);
1176 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag);
1177 }
1178 ch_allow |= pr_allow;
1179
1180 error = vfs_getopt(opts, "name", (void **)&name, &len);
1181 if (error == ENOENT)
1182 name = NULL;
1183 else if (error != 0)
1184 goto done_free;
1185 else {
1186 if (len == 0 || name[len - 1] != '\0') {
1187 error = EINVAL;
1188 goto done_free;
1189 }
1190 if (len > MAXHOSTNAMELEN) {
1191 error = ENAMETOOLONG;
1192 goto done_free;
1193 }
1194 }
1195
1196 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
1197 if (error == ENOENT)
1198 host = NULL;
1199 else if (error != 0)
1200 goto done_free;
1201 else {
1202 ch_flags |= PR_HOST;
1203 pr_flags |= PR_HOST;
1204 if (len == 0 || host[len - 1] != '\0') {
1205 error = EINVAL;
1206 goto done_free;
1207 }
1208 if (len > MAXHOSTNAMELEN) {
1209 error = ENAMETOOLONG;
1210 goto done_free;
1211 }
1212 }
1213
1214 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
1215 if (error == ENOENT)
1216 domain = NULL;
1217 else if (error != 0)
1218 goto done_free;
1219 else {
1220 ch_flags |= PR_HOST;
1221 pr_flags |= PR_HOST;
1222 if (len == 0 || domain[len - 1] != '\0') {
1223 error = EINVAL;
1224 goto done_free;
1225 }
1226 if (len > MAXHOSTNAMELEN) {
1227 error = ENAMETOOLONG;
1228 goto done_free;
1229 }
1230 }
1231
1232 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
1233 if (error == ENOENT)
1234 uuid = NULL;
1235 else if (error != 0)
1236 goto done_free;
1237 else {
1238 ch_flags |= PR_HOST;
1239 pr_flags |= PR_HOST;
1240 if (len == 0 || uuid[len - 1] != '\0') {
1241 error = EINVAL;
1242 goto done_free;
1243 }
1244 if (len > HOSTUUIDLEN) {
1245 error = ENAMETOOLONG;
1246 goto done_free;
1247 }
1248 }
1249
1250 #ifdef COMPAT_FREEBSD32
1251 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
1252 uint32_t hid32;
1253
1254 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
1255 hid = hid32;
1256 } else
1257 #endif
1258 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
1259 if (error == ENOENT)
1260 gothid = 0;
1261 else if (error != 0)
1262 goto done_free;
1263 else {
1264 gothid = 1;
1265 ch_flags |= PR_HOST;
1266 pr_flags |= PR_HOST;
1267 }
1268
1269 #ifdef INET
1270 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
1271 if (error == ENOENT)
1272 ip4s = 0;
1273 else if (error != 0)
1274 goto done_free;
1275 else if (ip4s & (sizeof(struct in_addr) - 1)) {
1276 error = EINVAL;
1277 goto done_free;
1278 } else {
1279 ch_flags |= PR_IP4_USER;
1280 pr_flags |= PR_IP4_USER;
1281 if (ip4s > 0) {
1282 ip4s /= sizeof(struct in_addr);
1283 if (ip4s > jail_max_af_ips) {
1284 error = EINVAL;
1285 vfs_opterror(opts, "too many IPv4 addresses");
1286 goto done_errmsg;
1287 }
1288 ip4 = prison_ip_copyin(PR_INET, op, ip4s);
1289 if (ip4 == NULL) {
1290 error = EINVAL;
1291 goto done_free;
1292 }
1293 }
1294 }
1295 #endif
1296
1297 #ifdef INET6
1298 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
1299 if (error == ENOENT)
1300 ip6s = 0;
1301 else if (error != 0)
1302 goto done_free;
1303 else if (ip6s & (sizeof(struct in6_addr) - 1)) {
1304 error = EINVAL;
1305 goto done_free;
1306 } else {
1307 ch_flags |= PR_IP6_USER;
1308 pr_flags |= PR_IP6_USER;
1309 if (ip6s > 0) {
1310 ip6s /= sizeof(struct in6_addr);
1311 if (ip6s > jail_max_af_ips) {
1312 error = EINVAL;
1313 vfs_opterror(opts, "too many IPv6 addresses");
1314 goto done_errmsg;
1315 }
1316 ip6 = prison_ip_copyin(PR_INET6, op, ip6s);
1317 if (ip6 == NULL) {
1318 error = EINVAL;
1319 goto done_free;
1320 }
1321 }
1322 }
1323 #endif
1324
1325 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1326 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1327 error = EINVAL;
1328 vfs_opterror(opts,
1329 "vnet jails cannot have IP address restrictions");
1330 goto done_errmsg;
1331 }
1332 #endif
1333
1334 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len);
1335 if (error == ENOENT)
1336 osrelstr = NULL;
1337 else if (error != 0)
1338 goto done_free;
1339 else {
1340 if (flags & JAIL_UPDATE) {
1341 error = EINVAL;
1342 vfs_opterror(opts,
1343 "osrelease cannot be changed after creation");
1344 goto done_errmsg;
1345 }
1346 if (len == 0 || osrelstr[len - 1] != '\0') {
1347 error = EINVAL;
1348 goto done_free;
1349 }
1350 if (len >= OSRELEASELEN) {
1351 error = ENAMETOOLONG;
1352 vfs_opterror(opts,
1353 "osrelease string must be 1-%d bytes long",
1354 OSRELEASELEN - 1);
1355 goto done_errmsg;
1356 }
1357 }
1358
1359 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt));
1360 if (error == ENOENT)
1361 osreldt = 0;
1362 else if (error != 0)
1363 goto done_free;
1364 else {
1365 if (flags & JAIL_UPDATE) {
1366 error = EINVAL;
1367 vfs_opterror(opts,
1368 "osreldate cannot be changed after creation");
1369 goto done_errmsg;
1370 }
1371 if (osreldt == 0) {
1372 error = EINVAL;
1373 vfs_opterror(opts, "osreldate cannot be 0");
1374 goto done_errmsg;
1375 }
1376 }
1377
1378 root = NULL;
1379 error = vfs_getopt(opts, "path", (void **)&path, &len);
1380 if (error == ENOENT)
1381 path = NULL;
1382 else if (error != 0)
1383 goto done_free;
1384 else {
1385 if (flags & JAIL_UPDATE) {
1386 error = EINVAL;
1387 vfs_opterror(opts,
1388 "path cannot be changed after creation");
1389 goto done_errmsg;
1390 }
1391 if (len == 0 || path[len - 1] != '\0') {
1392 error = EINVAL;
1393 goto done_free;
1394 }
1395 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path);
1396 error = namei(&nd);
1397 if (error)
1398 goto done_free;
1399 root = nd.ni_vp;
1400 NDFREE_PNBUF(&nd);
1401 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1402 strlcpy(g_path, path, MAXPATHLEN);
1403 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
1404 if (error == 0) {
1405 path = g_path;
1406 } else {
1407 /* exit on other errors */
1408 goto done_free;
1409 }
1410 if (root->v_type != VDIR) {
1411 error = ENOTDIR;
1412 vput(root);
1413 goto done_free;
1414 }
1415 VOP_UNLOCK(root);
1416 }
1417
1418 /*
1419 * Find the specified jail, or at least its parent.
1420 * This abuses the file error codes ENOENT and EEXIST.
1421 */
1422 pr = NULL;
1423 inspr = NULL;
1424 deadpr = NULL;
1425 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
1426 namelc = strrchr(name, '.');
1427 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
1428 if (*p != '\0')
1429 jid = 0;
1430 }
1431 sx_xlock(&allprison_lock);
1432 drflags = PD_LIST_XLOCKED;
1433 ppr = mypr;
1434 if (!prison_isalive(ppr)) {
1435 /* This jail is dying. This process will surely follow. */
1436 error = EAGAIN;
1437 goto done_deref;
1438 }
1439 if (jid != 0) {
1440 if (jid < 0) {
1441 error = EINVAL;
1442 vfs_opterror(opts, "negative jid");
1443 goto done_deref;
1444 }
1445 /*
1446 * See if a requested jid already exists. Keep track of
1447 * where it can be inserted later.
1448 */
1449 TAILQ_FOREACH(inspr, &allprison, pr_list) {
1450 if (inspr->pr_id < jid)
1451 continue;
1452 if (inspr->pr_id > jid)
1453 break;
1454 if (prison_isalive(inspr)) {
1455 pr = inspr;
1456 mtx_lock(&pr->pr_mtx);
1457 drflags |= PD_LOCKED;
1458 } else {
1459 /* Note a dying jail to handle later. */
1460 deadpr = inspr;
1461 }
1462 inspr = NULL;
1463 break;
1464 }
1465 if (cuflags == JAIL_CREATE && pr != NULL) {
1466 /*
1467 * Even creators that cannot see the jail will
1468 * get EEXIST.
1469 */
1470 error = EEXIST;
1471 vfs_opterror(opts, "jail %d already exists", jid);
1472 goto done_deref;
1473 }
1474 if ((pr == NULL)
1475 ? cuflags == JAIL_UPDATE
1476 : !prison_ischild(mypr, pr)) {
1477 /*
1478 * Updaters get ENOENT for nonexistent jails,
1479 * or for jails they cannot see. The latter
1480 * case is true even for CREATE | UPDATE,
1481 * which normally cannot give this error.
1482 */
1483 error = ENOENT;
1484 vfs_opterror(opts, "jail %d not found", jid);
1485 goto done_deref;
1486 }
1487 }
1488 /*
1489 * If the caller provided a name, look for a jail by that name.
1490 * This has different semantics for creates and updates keyed by jid
1491 * (where the name must not already exist in a different jail),
1492 * and updates keyed by the name itself (where the name must exist
1493 * because that is the jail being updated).
1494 */
1495 namelc = NULL;
1496 if (name != NULL) {
1497 namelc = strrchr(name, '.');
1498 if (namelc == NULL)
1499 namelc = name;
1500 else {
1501 /*
1502 * This is a hierarchical name. Split it into the
1503 * parent and child names, and make sure the parent
1504 * exists or matches an already found jail.
1505 */
1506 if (pr != NULL) {
1507 if (strncmp(name, ppr->pr_name, namelc - name)
1508 || ppr->pr_name[namelc - name] != '\0') {
1509 error = EINVAL;
1510 vfs_opterror(opts,
1511 "cannot change jail's parent");
1512 goto done_deref;
1513 }
1514 } else {
1515 *namelc = '\0';
1516 ppr = prison_find_name(mypr, name);
1517 if (ppr == NULL) {
1518 error = ENOENT;
1519 vfs_opterror(opts,
1520 "jail \"%s\" not found", name);
1521 goto done_deref;
1522 }
1523 mtx_unlock(&ppr->pr_mtx);
1524 if (!prison_isalive(ppr)) {
1525 error = ENOENT;
1526 vfs_opterror(opts,
1527 "jail \"%s\" is dying", name);
1528 goto done_deref;
1529 }
1530 *namelc = '.';
1531 }
1532 namelc++;
1533 }
1534 if (namelc[0] != '\0') {
1535 pnamelen =
1536 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1537 FOREACH_PRISON_CHILD(ppr, tpr) {
1538 if (tpr == pr || !prison_isalive(tpr) ||
1539 strcmp(tpr->pr_name + pnamelen, namelc))
1540 continue;
1541 if (cuflags == JAIL_CREATE || pr != NULL) {
1542 /*
1543 * Create, or update(jid): name must
1544 * not exist in an active sibling jail.
1545 */
1546 error = EEXIST;
1547 vfs_opterror(opts,
1548 "jail \"%s\" already exists", name);
1549 goto done_deref;
1550 }
1551 /* Use this jail for updates. */
1552 pr = tpr;
1553 mtx_lock(&pr->pr_mtx);
1554 drflags |= PD_LOCKED;
1555 break;
1556 }
1557 /*
1558 * Update: name must exist if no jid is specified.
1559 * As with the jid case, the jail must be currently
1560 * visible, or else even CREATE | UPDATE will get
1561 * an error.
1562 */
1563 if ((pr == NULL)
1564 ? cuflags == JAIL_UPDATE
1565 : !prison_isalive(pr)) {
1566 error = ENOENT;
1567 vfs_opterror(opts, "jail \"%s\" not found",
1568 name);
1569 goto done_deref;
1570 }
1571 }
1572 }
1573 /* Update: must provide a jid or name. */
1574 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1575 error = ENOENT;
1576 vfs_opterror(opts, "update specified no jail");
1577 goto done_deref;
1578 }
1579
1580 /* If there's no prison to update, create a new one and link it in. */
1581 created = pr == NULL;
1582 if (created) {
1583 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1584 if (tpr->pr_childcount >= tpr->pr_childmax) {
1585 error = EPERM;
1586 vfs_opterror(opts, "prison limit exceeded");
1587 goto done_deref;
1588 }
1589
1590 if (deadpr != NULL) {
1591 /*
1592 * The prison being created has the same ID as a dying
1593 * one. Handle this by giving the dying jail a new ID.
1594 * This may cause some confusion to user space, but
1595 * only to those listing dying jails.
1596 */
1597 deadid = get_next_deadid(&dinspr);
1598 if (deadid == 0) {
1599 error = EAGAIN;
1600 vfs_opterror(opts, "no available jail IDs");
1601 goto done_deref;
1602 }
1603 mtx_lock(&deadpr->pr_mtx);
1604 deadpr->pr_id = deadid;
1605 mtx_unlock(&deadpr->pr_mtx);
1606 if (dinspr == deadpr)
1607 inspr = deadpr;
1608 else {
1609 inspr = TAILQ_NEXT(deadpr, pr_list);
1610 TAILQ_REMOVE(&allprison, deadpr, pr_list);
1611 if (dinspr != NULL)
1612 TAILQ_INSERT_AFTER(&allprison, dinspr,
1613 deadpr, pr_list);
1614 else
1615 TAILQ_INSERT_HEAD(&allprison, deadpr,
1616 pr_list);
1617 }
1618 }
1619 if (jid == 0 && (jid = get_next_prid(&inspr)) == 0) {
1620 error = EAGAIN;
1621 vfs_opterror(opts, "no available jail IDs");
1622 goto done_deref;
1623 }
1624
1625 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1626 pr->pr_state = PRISON_STATE_INVALID;
1627 refcount_init(&pr->pr_ref, 1);
1628 refcount_init(&pr->pr_uref, 0);
1629 drflags |= PD_DEREF;
1630 LIST_INIT(&pr->pr_children);
1631 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1632 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
1633
1634 pr->pr_id = jid;
1635 if (inspr != NULL)
1636 TAILQ_INSERT_BEFORE(inspr, pr, pr_list);
1637 else
1638 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1639
1640 pr->pr_parent = ppr;
1641 prison_hold(ppr);
1642 prison_proc_hold(ppr);
1643 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1644 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1645 tpr->pr_childcount++;
1646
1647 /* Set some default values, and inherit some from the parent. */
1648 if (namelc == NULL)
1649 namelc = "";
1650 if (path == NULL) {
1651 path = "/";
1652 root = mypr->pr_root;
1653 vref(root);
1654 }
1655 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1656 pr->pr_flags |= PR_HOST;
1657 #if defined(INET) || defined(INET6)
1658 #ifdef VIMAGE
1659 if (!(pr_flags & PR_VNET))
1660 #endif
1661 {
1662 #ifdef INET
1663 if (!(ch_flags & PR_IP4_USER))
1664 pr->pr_flags |= PR_IP4 | PR_IP4_USER;
1665 else if (!(pr_flags & PR_IP4_USER)) {
1666 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1667 prison_ip_dup(ppr, pr, PR_INET);
1668 }
1669 #endif
1670 #ifdef INET6
1671 if (!(ch_flags & PR_IP6_USER))
1672 pr->pr_flags |= PR_IP6 | PR_IP6_USER;
1673 else if (!(pr_flags & PR_IP6_USER)) {
1674 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1675 prison_ip_dup(ppr, pr, PR_INET6);
1676 }
1677 #endif
1678 }
1679 #endif
1680 /* Source address selection is always on by default. */
1681 pr->pr_flags |= _PR_IP_SADDRSEL;
1682
1683 pr->pr_securelevel = ppr->pr_securelevel;
1684 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1685 pr->pr_enforce_statfs = jail_default_enforce_statfs;
1686 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
1687
1688 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate;
1689 if (osrelstr == NULL)
1690 strlcpy(pr->pr_osrelease, ppr->pr_osrelease,
1691 sizeof(pr->pr_osrelease));
1692 else
1693 strlcpy(pr->pr_osrelease, osrelstr,
1694 sizeof(pr->pr_osrelease));
1695
1696 #ifdef VIMAGE
1697 /*
1698 * Allocate a new vnet if specified.
1699 *
1700 * Set PR_VNET now if so, so that the vnet is disposed of
1701 * properly when the jail is destroyed.
1702 */
1703 if (pr_flags & PR_VNET) {
1704 pr->pr_flags |= PR_VNET;
1705 pr->pr_vnet = vnet_alloc();
1706 } else {
1707 pr->pr_vnet = ppr->pr_vnet;
1708 }
1709 #endif
1710 /*
1711 * Allocate a dedicated cpuset for each jail.
1712 * Unlike other initial settings, this may return an error.
1713 */
1714 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1715 if (error)
1716 goto done_deref;
1717
1718 mtx_lock(&pr->pr_mtx);
1719 drflags |= PD_LOCKED;
1720 } else {
1721 /*
1722 * Grab a reference for existing prisons, to ensure they
1723 * continue to exist for the duration of the call.
1724 */
1725 prison_hold(pr);
1726 drflags |= PD_DEREF;
1727 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1728 if ((pr->pr_flags & PR_VNET) &&
1729 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1730 error = EINVAL;
1731 vfs_opterror(opts,
1732 "vnet jails cannot have IP address restrictions");
1733 goto done_deref;
1734 }
1735 #endif
1736 #ifdef INET
1737 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1738 error = EINVAL;
1739 vfs_opterror(opts,
1740 "ip4 cannot be changed after creation");
1741 goto done_deref;
1742 }
1743 #endif
1744 #ifdef INET6
1745 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1746 error = EINVAL;
1747 vfs_opterror(opts,
1748 "ip6 cannot be changed after creation");
1749 goto done_deref;
1750 }
1751 #endif
1752 }
1753
1754 /* Do final error checking before setting anything. */
1755 if (gotslevel) {
1756 if (slevel < ppr->pr_securelevel) {
1757 error = EPERM;
1758 goto done_deref;
1759 }
1760 }
1761 if (gotchildmax) {
1762 if (childmax >= ppr->pr_childmax) {
1763 error = EPERM;
1764 goto done_deref;
1765 }
1766 }
1767 if (gotenforce) {
1768 if (enforce < ppr->pr_enforce_statfs) {
1769 error = EPERM;
1770 goto done_deref;
1771 }
1772 }
1773 if (gotrsnum) {
1774 /*
1775 * devfs_rsnum is a uint16_t
1776 */
1777 if (rsnum < 0 || rsnum > 65535) {
1778 error = EINVAL;
1779 goto done_deref;
1780 }
1781 /*
1782 * Nested jails always inherit parent's devfs ruleset
1783 */
1784 if (jailed(td->td_ucred)) {
1785 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
1786 error = EPERM;
1787 goto done_deref;
1788 } else
1789 rsnum = ppr->pr_devfs_rsnum;
1790 }
1791 }
1792 #ifdef INET
1793 if (ip4s > 0) {
1794 if ((ppr->pr_flags & PR_IP4) &&
1795 !prison_ip_parent_match(ppr->pr_addrs[PR_INET], ip4,
1796 PR_INET)) {
1797 error = EPERM;
1798 goto done_deref;
1799 }
1800 if (!prison_ip_conflict_check(ppr, pr, ip4, PR_INET)) {
1801 error = EADDRINUSE;
1802 vfs_opterror(opts, "IPv4 addresses clash");
1803 goto done_deref;
1804 }
1805 }
1806 #endif
1807 #ifdef INET6
1808 if (ip6s > 0) {
1809 if ((ppr->pr_flags & PR_IP6) &&
1810 !prison_ip_parent_match(ppr->pr_addrs[PR_INET6], ip6,
1811 PR_INET6)) {
1812 error = EPERM;
1813 goto done_deref;
1814 }
1815 if (!prison_ip_conflict_check(ppr, pr, ip6, PR_INET6)) {
1816 error = EADDRINUSE;
1817 vfs_opterror(opts, "IPv6 addresses clash");
1818 goto done_deref;
1819 }
1820 }
1821 #endif
1822 onamelen = namelen = 0;
1823 if (namelc != NULL) {
1824 /* Give a default name of the jid. Also allow the name to be
1825 * explicitly the jid - but not any other number, and only in
1826 * normal form (no leading zero/etc).
1827 */
1828 if (namelc[0] == '\0')
1829 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid);
1830 else if ((strtoul(namelc, &p, 10) != jid ||
1831 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') {
1832 error = EINVAL;
1833 vfs_opterror(opts,
1834 "name cannot be numeric (unless it is the jid)");
1835 goto done_deref;
1836 }
1837 /*
1838 * Make sure the name isn't too long for the prison or its
1839 * children.
1840 */
1841 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1842 onamelen = strlen(pr->pr_name + pnamelen);
1843 namelen = strlen(namelc);
1844 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) {
1845 error = ENAMETOOLONG;
1846 goto done_deref;
1847 }
1848 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1849 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
1850 sizeof(pr->pr_name)) {
1851 error = ENAMETOOLONG;
1852 goto done_deref;
1853 }
1854 }
1855 }
1856 pr_allow_diff = pr_allow & ~ppr->pr_allow;
1857 if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) {
1858 error = EPERM;
1859 goto done_deref;
1860 }
1861
1862 /*
1863 * Let modules check their parameters. This requires unlocking and
1864 * then re-locking the prison, but this is still a valid state as long
1865 * as allprison_lock remains xlocked.
1866 */
1867 mtx_unlock(&pr->pr_mtx);
1868 drflags &= ~PD_LOCKED;
1869 error = osd_jail_call(pr, PR_METHOD_CHECK, opts);
1870 if (error != 0)
1871 goto done_deref;
1872 mtx_lock(&pr->pr_mtx);
1873 drflags |= PD_LOCKED;
1874
1875 /* At this point, all valid parameters should have been noted. */
1876 TAILQ_FOREACH(opt, opts, link) {
1877 if (!opt->seen && strcmp(opt->name, "errmsg")) {
1878 error = EINVAL;
1879 vfs_opterror(opts, "unknown parameter: %s", opt->name);
1880 goto done_deref;
1881 }
1882 }
1883
1884 /* Set the parameters of the prison. */
1885 #ifdef INET
1886 redo_ip4 = false;
1887 if (pr_flags & PR_IP4_USER) {
1888 pr->pr_flags |= PR_IP4;
1889 prison_ip_set(pr, PR_INET, ip4);
1890 ip4 = NULL;
1891 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1892 #ifdef VIMAGE
1893 if (tpr->pr_flags & PR_VNET) {
1894 descend = 0;
1895 continue;
1896 }
1897 #endif
1898 if (!prison_ip_restrict(tpr, PR_INET, NULL)) {
1899 redo_ip4 = true;
1900 descend = 0;
1901 }
1902 }
1903 }
1904 #endif
1905 #ifdef INET6
1906 redo_ip6 = false;
1907 if (pr_flags & PR_IP6_USER) {
1908 pr->pr_flags |= PR_IP6;
1909 prison_ip_set(pr, PR_INET6, ip6);
1910 ip6 = NULL;
1911 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1912 #ifdef VIMAGE
1913 if (tpr->pr_flags & PR_VNET) {
1914 descend = 0;
1915 continue;
1916 }
1917 #endif
1918 if (!prison_ip_restrict(tpr, PR_INET6, NULL)) {
1919 redo_ip6 = true;
1920 descend = 0;
1921 }
1922 }
1923 }
1924 #endif
1925 if (gotslevel) {
1926 pr->pr_securelevel = slevel;
1927 /* Set all child jails to be at least this level. */
1928 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1929 if (tpr->pr_securelevel < slevel)
1930 tpr->pr_securelevel = slevel;
1931 }
1932 if (gotchildmax) {
1933 pr->pr_childmax = childmax;
1934 /* Set all child jails to under this limit. */
1935 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
1936 if (tpr->pr_childmax > childmax - level)
1937 tpr->pr_childmax = childmax > level
1938 ? childmax - level : 0;
1939 }
1940 if (gotenforce) {
1941 pr->pr_enforce_statfs = enforce;
1942 /* Pass this restriction on to the children. */
1943 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1944 if (tpr->pr_enforce_statfs < enforce)
1945 tpr->pr_enforce_statfs = enforce;
1946 }
1947 if (gotrsnum) {
1948 pr->pr_devfs_rsnum = rsnum;
1949 /* Pass this restriction on to the children. */
1950 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1951 tpr->pr_devfs_rsnum = rsnum;
1952 }
1953 if (namelc != NULL) {
1954 if (ppr == &prison0)
1955 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name));
1956 else
1957 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
1958 ppr->pr_name, namelc);
1959 /* Change this component of child names. */
1960 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1961 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
1962 strlen(tpr->pr_name + onamelen) + 1);
1963 bcopy(pr->pr_name, tpr->pr_name, namelen);
1964 }
1965 }
1966 if (path != NULL) {
1967 /* Try to keep a real-rooted full pathname. */
1968 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
1969 pr->pr_root = root;
1970 root = NULL;
1971 }
1972 if (PR_HOST & ch_flags & ~pr_flags) {
1973 if (pr->pr_flags & PR_HOST) {
1974 /*
1975 * Copy the parent's host info. As with pr_ip4 above,
1976 * the lack of a lock on the parent is not a problem;
1977 * it is always set with allprison_lock at least
1978 * shared, and is held exclusively here.
1979 */
1980 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
1981 sizeof(pr->pr_hostname));
1982 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
1983 sizeof(pr->pr_domainname));
1984 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
1985 sizeof(pr->pr_hostuuid));
1986 pr->pr_hostid = pr->pr_parent->pr_hostid;
1987 }
1988 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
1989 /* Set this prison, and any descendants without PR_HOST. */
1990 if (host != NULL)
1991 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
1992 if (domain != NULL)
1993 strlcpy(pr->pr_domainname, domain,
1994 sizeof(pr->pr_domainname));
1995 if (uuid != NULL)
1996 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
1997 if (gothid)
1998 pr->pr_hostid = hid;
1999 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2000 if (tpr->pr_flags & PR_HOST)
2001 descend = 0;
2002 else {
2003 if (host != NULL)
2004 strlcpy(tpr->pr_hostname,
2005 pr->pr_hostname,
2006 sizeof(tpr->pr_hostname));
2007 if (domain != NULL)
2008 strlcpy(tpr->pr_domainname,
2009 pr->pr_domainname,
2010 sizeof(tpr->pr_domainname));
2011 if (uuid != NULL)
2012 strlcpy(tpr->pr_hostuuid,
2013 pr->pr_hostuuid,
2014 sizeof(tpr->pr_hostuuid));
2015 if (gothid)
2016 tpr->pr_hostid = hid;
2017 }
2018 }
2019 }
2020 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
2021 if ((tallow = ch_allow & ~pr_allow))
2022 prison_set_allow_locked(pr, tallow, 0);
2023 /*
2024 * Persistent prisons get an extra reference, and prisons losing their
2025 * persist flag lose that reference.
2026 */
2027 if (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags)) {
2028 if (pr_flags & PR_PERSIST) {
2029 prison_hold(pr);
2030 /*
2031 * This may be a new prison's first user reference,
2032 * but wait to call it alive until after OSD calls
2033 * have had a chance to run (and perhaps to fail).
2034 */
2035 refcount_acquire(&pr->pr_uref);
2036 } else {
2037 drflags |= PD_DEUREF;
2038 prison_free_not_last(pr);
2039 }
2040 }
2041 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
2042 mtx_unlock(&pr->pr_mtx);
2043 drflags &= ~PD_LOCKED;
2044 /*
2045 * Any errors past this point will need to de-persist newly created
2046 * prisons, as well as call remove methods.
2047 */
2048 if (created)
2049 drflags |= PD_KILL;
2050
2051 #ifdef RACCT
2052 if (racct_enable && created)
2053 prison_racct_attach(pr);
2054 #endif
2055
2056 /* Locks may have prevented a complete restriction of child IP
2057 * addresses. If so, allocate some more memory and try again.
2058 */
2059 #ifdef INET
2060 while (redo_ip4) {
2061 ip4s = pr->pr_addrs[PR_INET]->ips;
2062 MPASS(ip4 == NULL);
2063 ip4 = prison_ip_alloc(PR_INET, ip4s, M_WAITOK);
2064 mtx_lock(&pr->pr_mtx);
2065 redo_ip4 = false;
2066 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2067 #ifdef VIMAGE
2068 if (tpr->pr_flags & PR_VNET) {
2069 descend = 0;
2070 continue;
2071 }
2072 #endif
2073 if (!prison_ip_restrict(tpr, PR_INET, &ip4))
2074 redo_ip4 = true;
2075 }
2076 mtx_unlock(&pr->pr_mtx);
2077 }
2078 #endif
2079 #ifdef INET6
2080 while (redo_ip6) {
2081 ip6s = pr->pr_addrs[PR_INET6]->ips;
2082 MPASS(ip6 == NULL);
2083 ip6 = prison_ip_alloc(PR_INET6, ip6s, M_WAITOK);
2084 mtx_lock(&pr->pr_mtx);
2085 redo_ip6 = false;
2086 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2087 #ifdef VIMAGE
2088 if (tpr->pr_flags & PR_VNET) {
2089 descend = 0;
2090 continue;
2091 }
2092 #endif
2093 if (!prison_ip_restrict(tpr, PR_INET6, &ip6))
2094 redo_ip6 = true;
2095 }
2096 mtx_unlock(&pr->pr_mtx);
2097 }
2098 #endif
2099
2100 /* Let the modules do their work. */
2101 if (created) {
2102 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
2103 if (error)
2104 goto done_deref;
2105 }
2106 error = osd_jail_call(pr, PR_METHOD_SET, opts);
2107 if (error)
2108 goto done_deref;
2109
2110 /*
2111 * A new prison is now ready to be seen; either it has gained a user
2112 * reference via persistence, or is about to gain one via attachment.
2113 */
2114 if (created) {
2115 drflags = prison_lock_xlock(pr, drflags);
2116 pr->pr_state = PRISON_STATE_ALIVE;
2117 }
2118
2119 /* Attach this process to the prison if requested. */
2120 if (flags & JAIL_ATTACH) {
2121 error = do_jail_attach(td, pr,
2122 prison_lock_xlock(pr, drflags & PD_LOCK_FLAGS));
2123 drflags &= ~(PD_LOCKED | PD_LIST_XLOCKED);
2124 if (error) {
2125 vfs_opterror(opts, "attach failed");
2126 goto done_deref;
2127 }
2128 }
2129
2130 #ifdef RACCT
2131 if (racct_enable && !created) {
2132 if (drflags & PD_LOCKED) {
2133 mtx_unlock(&pr->pr_mtx);
2134 drflags &= ~PD_LOCKED;
2135 }
2136 if (drflags & PD_LIST_XLOCKED) {
2137 sx_xunlock(&allprison_lock);
2138 drflags &= ~PD_LIST_XLOCKED;
2139 }
2140 prison_racct_modify(pr);
2141 }
2142 #endif
2143
2144 if (created && pr != &prison0 && (pr->pr_allow & PR_ALLOW_NFSD) != 0 &&
2145 (pr->pr_root->v_vflag & VV_ROOT) == 0)
2146 printf("Warning jail jid=%d: mountd/nfsd requires a separate"
2147 " file system\n", pr->pr_id);
2148
2149 drflags &= ~PD_KILL;
2150 td->td_retval[0] = pr->pr_id;
2151
2152 done_deref:
2153 /* Release any temporary prison holds and/or locks. */
2154 if (pr != NULL)
2155 prison_deref(pr, drflags);
2156 else if (drflags & PD_LIST_SLOCKED)
2157 sx_sunlock(&allprison_lock);
2158 else if (drflags & PD_LIST_XLOCKED)
2159 sx_xunlock(&allprison_lock);
2160 if (root != NULL)
2161 vrele(root);
2162 done_errmsg:
2163 if (error) {
2164 /* Write the error message back to userspace. */
2165 if (vfs_getopt(opts, "errmsg", (void **)&errmsg,
2166 &errmsg_len) == 0 && errmsg_len > 0) {
2167 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
2168 if (optuio->uio_segflg == UIO_SYSSPACE)
2169 bcopy(errmsg,
2170 optuio->uio_iov[errmsg_pos].iov_base,
2171 errmsg_len);
2172 else
2173 (void)copyout(errmsg,
2174 optuio->uio_iov[errmsg_pos].iov_base,
2175 errmsg_len);
2176 }
2177 }
2178 done_free:
2179 #ifdef INET
2180 prison_ip_free(ip4);
2181 #endif
2182 #ifdef INET6
2183 prison_ip_free(ip6);
2184 #endif
2185 if (g_path != NULL)
2186 free(g_path, M_TEMP);
2187 vfs_freeopts(opts);
2188 return (error);
2189 }
2190
2191 /*
2192 * Find the next available prison ID. Return the ID on success, or zero
2193 * on failure. Also set a pointer to the allprison list entry the prison
2194 * should be inserted before.
2195 */
2196 static int
get_next_prid(struct prison ** insprp)2197 get_next_prid(struct prison **insprp)
2198 {
2199 struct prison *inspr;
2200 int jid, maxid;
2201
2202 jid = lastprid % JAIL_MAX + 1;
2203 if (TAILQ_EMPTY(&allprison) ||
2204 TAILQ_LAST(&allprison, prisonlist)->pr_id < jid) {
2205 /*
2206 * A common case is for all jails to be implicitly numbered,
2207 * which means they'll go on the end of the list, at least
2208 * for the first JAIL_MAX times.
2209 */
2210 inspr = NULL;
2211 } else {
2212 /*
2213 * Take two passes through the allprison list: first starting
2214 * with the proposed jid, then ending with it.
2215 */
2216 for (maxid = JAIL_MAX; maxid != 0; ) {
2217 TAILQ_FOREACH(inspr, &allprison, pr_list) {
2218 if (inspr->pr_id < jid)
2219 continue;
2220 if (inspr->pr_id > jid) {
2221 /* Found an opening. */
2222 maxid = 0;
2223 break;
2224 }
2225 if (++jid > maxid) {
2226 if (lastprid == maxid || lastprid == 0)
2227 {
2228 /*
2229 * The entire legal range
2230 * has been traversed
2231 */
2232 return 0;
2233 }
2234 /* Try again from the start. */
2235 jid = 1;
2236 maxid = lastprid;
2237 break;
2238 }
2239 }
2240 if (inspr == NULL) {
2241 /* Found room at the end of the list. */
2242 break;
2243 }
2244 }
2245 }
2246 *insprp = inspr;
2247 lastprid = jid;
2248 return (jid);
2249 }
2250
2251 /*
2252 * Find the next available ID for a renumbered dead prison. This is the same
2253 * as get_next_prid, but counting backward from the end of the range.
2254 */
2255 static int
get_next_deadid(struct prison ** dinsprp)2256 get_next_deadid(struct prison **dinsprp)
2257 {
2258 struct prison *dinspr;
2259 int deadid, minid;
2260
2261 deadid = lastdeadid ? lastdeadid - 1 : JAIL_MAX;
2262 /*
2263 * Take two reverse passes through the allprison list: first
2264 * starting with the proposed deadid, then ending with it.
2265 */
2266 for (minid = 1; minid != 0; ) {
2267 TAILQ_FOREACH_REVERSE(dinspr, &allprison, prisonlist, pr_list) {
2268 if (dinspr->pr_id > deadid)
2269 continue;
2270 if (dinspr->pr_id < deadid) {
2271 /* Found an opening. */
2272 minid = 0;
2273 break;
2274 }
2275 if (--deadid < minid) {
2276 if (lastdeadid == minid || lastdeadid == 0)
2277 {
2278 /*
2279 * The entire legal range
2280 * has been traversed
2281 */
2282 return 0;
2283 }
2284 /* Try again from the end. */
2285 deadid = JAIL_MAX;
2286 minid = lastdeadid;
2287 break;
2288 }
2289 }
2290 if (dinspr == NULL) {
2291 /* Found room at the beginning of the list. */
2292 break;
2293 }
2294 }
2295 *dinsprp = dinspr;
2296 lastdeadid = deadid;
2297 return (deadid);
2298 }
2299
2300 /*
2301 * struct jail_get_args {
2302 * struct iovec *iovp;
2303 * unsigned int iovcnt;
2304 * int flags;
2305 * };
2306 */
2307 int
sys_jail_get(struct thread * td,struct jail_get_args * uap)2308 sys_jail_get(struct thread *td, struct jail_get_args *uap)
2309 {
2310 struct uio *auio;
2311 int error;
2312
2313 /* Check that we have an even number of iovecs. */
2314 if (uap->iovcnt & 1)
2315 return (EINVAL);
2316
2317 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
2318 if (error)
2319 return (error);
2320 error = kern_jail_get(td, auio, uap->flags);
2321 if (error == 0)
2322 error = copyout(auio->uio_iov, uap->iovp,
2323 uap->iovcnt * sizeof(struct iovec));
2324 freeuio(auio);
2325 return (error);
2326 }
2327
2328 int
kern_jail_get(struct thread * td,struct uio * optuio,int flags)2329 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
2330 {
2331 struct bool_flags *bf;
2332 struct jailsys_flags *jsf;
2333 struct prison *pr, *mypr;
2334 struct vfsopt *opt;
2335 struct vfsoptlist *opts;
2336 char *errmsg, *name;
2337 int drflags, error, errmsg_len, errmsg_pos, i, jid, len, pos;
2338 unsigned f;
2339
2340 if (flags & ~JAIL_GET_MASK)
2341 return (EINVAL);
2342
2343 /* Get the parameter list. */
2344 error = vfs_buildopts(optuio, &opts);
2345 if (error)
2346 return (error);
2347 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
2348 mypr = td->td_ucred->cr_prison;
2349 pr = NULL;
2350
2351 /*
2352 * Find the prison specified by one of: lastjid, jid, name.
2353 */
2354 sx_slock(&allprison_lock);
2355 drflags = PD_LIST_SLOCKED;
2356 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
2357 if (error == 0) {
2358 TAILQ_FOREACH(pr, &allprison, pr_list) {
2359 if (pr->pr_id > jid &&
2360 ((flags & JAIL_DYING) || prison_isalive(pr)) &&
2361 prison_ischild(mypr, pr)) {
2362 mtx_lock(&pr->pr_mtx);
2363 drflags |= PD_LOCKED;
2364 goto found_prison;
2365 }
2366 }
2367 error = ENOENT;
2368 vfs_opterror(opts, "no jail after %d", jid);
2369 goto done;
2370 } else if (error != ENOENT)
2371 goto done;
2372
2373 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
2374 if (error == 0) {
2375 if (jid != 0) {
2376 pr = prison_find_child(mypr, jid);
2377 if (pr != NULL) {
2378 drflags |= PD_LOCKED;
2379 if (!(prison_isalive(pr) ||
2380 (flags & JAIL_DYING))) {
2381 error = ENOENT;
2382 vfs_opterror(opts, "jail %d is dying",
2383 jid);
2384 goto done;
2385 }
2386 goto found_prison;
2387 }
2388 error = ENOENT;
2389 vfs_opterror(opts, "jail %d not found", jid);
2390 goto done;
2391 }
2392 } else if (error != ENOENT)
2393 goto done;
2394
2395 error = vfs_getopt(opts, "name", (void **)&name, &len);
2396 if (error == 0) {
2397 if (len == 0 || name[len - 1] != '\0') {
2398 error = EINVAL;
2399 goto done;
2400 }
2401 pr = prison_find_name(mypr, name);
2402 if (pr != NULL) {
2403 drflags |= PD_LOCKED;
2404 if (!(prison_isalive(pr) || (flags & JAIL_DYING))) {
2405 error = ENOENT;
2406 vfs_opterror(opts, "jail \"%s\" is dying",
2407 name);
2408 goto done;
2409 }
2410 goto found_prison;
2411 }
2412 error = ENOENT;
2413 vfs_opterror(opts, "jail \"%s\" not found", name);
2414 goto done;
2415 } else if (error != ENOENT)
2416 goto done;
2417
2418 vfs_opterror(opts, "no jail specified");
2419 error = ENOENT;
2420 goto done;
2421
2422 found_prison:
2423 /* Get the parameters of the prison. */
2424 prison_hold(pr);
2425 drflags |= PD_DEREF;
2426 td->td_retval[0] = pr->pr_id;
2427 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
2428 if (error != 0 && error != ENOENT)
2429 goto done;
2430 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
2431 error = vfs_setopt(opts, "parent", &i, sizeof(i));
2432 if (error != 0 && error != ENOENT)
2433 goto done;
2434 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
2435 if (error != 0 && error != ENOENT)
2436 goto done;
2437 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
2438 sizeof(pr->pr_cpuset->cs_id));
2439 if (error != 0 && error != ENOENT)
2440 goto done;
2441 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
2442 if (error != 0 && error != ENOENT)
2443 goto done;
2444 #ifdef INET
2445 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_addrs[PR_INET]->pr_ip,
2446 pr->pr_addrs[PR_INET] ? pr->pr_addrs[PR_INET]->ips *
2447 pr_families[PR_INET].size : 0 );
2448 if (error != 0 && error != ENOENT)
2449 goto done;
2450 #endif
2451 #ifdef INET6
2452 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_addrs[PR_INET6]->pr_ip,
2453 pr->pr_addrs[PR_INET6] ? pr->pr_addrs[PR_INET6]->ips *
2454 pr_families[PR_INET6].size : 0 );
2455 if (error != 0 && error != ENOENT)
2456 goto done;
2457 #endif
2458 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
2459 sizeof(pr->pr_securelevel));
2460 if (error != 0 && error != ENOENT)
2461 goto done;
2462 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
2463 sizeof(pr->pr_childcount));
2464 if (error != 0 && error != ENOENT)
2465 goto done;
2466 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
2467 sizeof(pr->pr_childmax));
2468 if (error != 0 && error != ENOENT)
2469 goto done;
2470 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
2471 if (error != 0 && error != ENOENT)
2472 goto done;
2473 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
2474 if (error != 0 && error != ENOENT)
2475 goto done;
2476 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
2477 if (error != 0 && error != ENOENT)
2478 goto done;
2479 #ifdef COMPAT_FREEBSD32
2480 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
2481 uint32_t hid32 = pr->pr_hostid;
2482
2483 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
2484 } else
2485 #endif
2486 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
2487 sizeof(pr->pr_hostid));
2488 if (error != 0 && error != ENOENT)
2489 goto done;
2490 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
2491 sizeof(pr->pr_enforce_statfs));
2492 if (error != 0 && error != ENOENT)
2493 goto done;
2494 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
2495 sizeof(pr->pr_devfs_rsnum));
2496 if (error != 0 && error != ENOENT)
2497 goto done;
2498 for (bf = pr_flag_bool;
2499 bf < pr_flag_bool + nitems(pr_flag_bool);
2500 bf++) {
2501 i = (pr->pr_flags & 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 for (jsf = pr_flag_jailsys;
2511 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
2512 jsf++) {
2513 f = pr->pr_flags & (jsf->disable | jsf->new);
2514 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE
2515 : (f == jsf->new) ? JAIL_SYS_NEW
2516 : JAIL_SYS_INHERIT;
2517 error = vfs_setopt(opts, jsf->name, &i, sizeof(i));
2518 if (error != 0 && error != ENOENT)
2519 goto done;
2520 }
2521 for (bf = pr_flag_allow;
2522 bf < pr_flag_allow + nitems(pr_flag_allow) &&
2523 atomic_load_int(&bf->flag) != 0;
2524 bf++) {
2525 i = (pr->pr_allow & bf->flag) ? 1 : 0;
2526 error = vfs_setopt(opts, bf->name, &i, sizeof(i));
2527 if (error != 0 && error != ENOENT)
2528 goto done;
2529 i = !i;
2530 error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
2531 if (error != 0 && error != ENOENT)
2532 goto done;
2533 }
2534 i = !prison_isalive(pr);
2535 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2536 if (error != 0 && error != ENOENT)
2537 goto done;
2538 i = !i;
2539 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2540 if (error != 0 && error != ENOENT)
2541 goto done;
2542 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate,
2543 sizeof(pr->pr_osreldate));
2544 if (error != 0 && error != ENOENT)
2545 goto done;
2546 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease);
2547 if (error != 0 && error != ENOENT)
2548 goto done;
2549
2550 /* Get the module parameters. */
2551 mtx_unlock(&pr->pr_mtx);
2552 drflags &= ~PD_LOCKED;
2553 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2554 if (error)
2555 goto done;
2556 prison_deref(pr, drflags);
2557 pr = NULL;
2558 drflags = 0;
2559
2560 /* By now, all parameters should have been noted. */
2561 TAILQ_FOREACH(opt, opts, link) {
2562 if (!opt->seen &&
2563 (strstr(opt->name, JAIL_META_PRIVATE ".") == opt->name ||
2564 strstr(opt->name, JAIL_META_SHARED ".") == opt->name)) {
2565 /* Communicate back a missing key. */
2566 free(opt->value, M_MOUNT);
2567 opt->value = NULL;
2568 opt->len = 0;
2569 continue;
2570 }
2571 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2572 error = EINVAL;
2573 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2574 goto done;
2575 }
2576 }
2577
2578 /* Write the fetched parameters back to userspace. */
2579 error = 0;
2580 TAILQ_FOREACH(opt, opts, link) {
2581 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2582 pos = 2 * opt->pos + 1;
2583 optuio->uio_iov[pos].iov_len = opt->len;
2584 if (opt->value != NULL) {
2585 if (optuio->uio_segflg == UIO_SYSSPACE) {
2586 bcopy(opt->value,
2587 optuio->uio_iov[pos].iov_base,
2588 opt->len);
2589 } else {
2590 error = copyout(opt->value,
2591 optuio->uio_iov[pos].iov_base,
2592 opt->len);
2593 if (error)
2594 break;
2595 }
2596 }
2597 }
2598 }
2599
2600 done:
2601 /* Release any temporary prison holds and/or locks. */
2602 if (pr != NULL)
2603 prison_deref(pr, drflags);
2604 else if (drflags & PD_LIST_SLOCKED)
2605 sx_sunlock(&allprison_lock);
2606 if (error && errmsg_pos >= 0) {
2607 /* Write the error message back to userspace. */
2608 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2609 errmsg_pos = 2 * errmsg_pos + 1;
2610 if (errmsg_len > 0) {
2611 if (optuio->uio_segflg == UIO_SYSSPACE)
2612 bcopy(errmsg,
2613 optuio->uio_iov[errmsg_pos].iov_base,
2614 errmsg_len);
2615 else
2616 (void)copyout(errmsg,
2617 optuio->uio_iov[errmsg_pos].iov_base,
2618 errmsg_len);
2619 }
2620 }
2621 vfs_freeopts(opts);
2622 return (error);
2623 }
2624
2625 /*
2626 * struct jail_remove_args {
2627 * int jid;
2628 * };
2629 */
2630 int
sys_jail_remove(struct thread * td,struct jail_remove_args * uap)2631 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
2632 {
2633 struct prison *pr;
2634 int error;
2635
2636 error = priv_check(td, PRIV_JAIL_REMOVE);
2637 if (error)
2638 return (error);
2639
2640 sx_xlock(&allprison_lock);
2641 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2642 if (pr == NULL) {
2643 sx_xunlock(&allprison_lock);
2644 return (EINVAL);
2645 }
2646 if (!prison_isalive(pr)) {
2647 /* Silently ignore already-dying prisons. */
2648 mtx_unlock(&pr->pr_mtx);
2649 sx_xunlock(&allprison_lock);
2650 return (0);
2651 }
2652 prison_deref(pr, PD_KILL | PD_LOCKED | PD_LIST_XLOCKED);
2653 return (0);
2654 }
2655
2656 /*
2657 * struct jail_attach_args {
2658 * int jid;
2659 * };
2660 */
2661 int
sys_jail_attach(struct thread * td,struct jail_attach_args * uap)2662 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
2663 {
2664 struct prison *pr;
2665 int error;
2666
2667 error = priv_check(td, PRIV_JAIL_ATTACH);
2668 if (error)
2669 return (error);
2670
2671 sx_slock(&allprison_lock);
2672 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2673 if (pr == NULL) {
2674 sx_sunlock(&allprison_lock);
2675 return (EINVAL);
2676 }
2677
2678 /* Do not allow a process to attach to a prison that is not alive. */
2679 if (!prison_isalive(pr)) {
2680 mtx_unlock(&pr->pr_mtx);
2681 sx_sunlock(&allprison_lock);
2682 return (EINVAL);
2683 }
2684
2685 return (do_jail_attach(td, pr, PD_LOCKED | PD_LIST_SLOCKED));
2686 }
2687
2688 static int
do_jail_attach(struct thread * td,struct prison * pr,int drflags)2689 do_jail_attach(struct thread *td, struct prison *pr, int drflags)
2690 {
2691 struct proc *p;
2692 struct ucred *newcred, *oldcred;
2693 int error;
2694
2695 mtx_assert(&pr->pr_mtx, MA_OWNED);
2696 sx_assert(&allprison_lock, SX_LOCKED);
2697 drflags &= PD_LOCK_FLAGS;
2698 /*
2699 * XXX: Note that there is a slight race here if two threads
2700 * in the same privileged process attempt to attach to two
2701 * different jails at the same time. It is important for
2702 * user processes not to do this, or they might end up with
2703 * a process root from one prison, but attached to the jail
2704 * of another.
2705 */
2706 prison_hold(pr);
2707 refcount_acquire(&pr->pr_uref);
2708 drflags |= PD_DEREF | PD_DEUREF;
2709 mtx_unlock(&pr->pr_mtx);
2710 drflags &= ~PD_LOCKED;
2711
2712 /* Let modules do whatever they need to prepare for attaching. */
2713 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
2714 if (error) {
2715 prison_deref(pr, drflags);
2716 return (error);
2717 }
2718 sx_unlock(&allprison_lock);
2719 drflags &= ~(PD_LIST_SLOCKED | PD_LIST_XLOCKED);
2720
2721 /*
2722 * Reparent the newly attached process to this jail.
2723 */
2724 p = td->td_proc;
2725 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
2726 if (error)
2727 goto e_revert_osd;
2728
2729 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
2730 if ((error = change_dir(pr->pr_root, td)) != 0)
2731 goto e_unlock;
2732 #ifdef MAC
2733 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
2734 goto e_unlock;
2735 #endif
2736 VOP_UNLOCK(pr->pr_root);
2737 if ((error = pwd_chroot_chdir(td, pr->pr_root)))
2738 goto e_revert_osd;
2739
2740 newcred = crget();
2741 PROC_LOCK(p);
2742 oldcred = crcopysafe(p, newcred);
2743 newcred->cr_prison = pr;
2744 proc_set_cred(p, newcred);
2745 setsugid(p);
2746 #ifdef RACCT
2747 racct_proc_ucred_changed(p, oldcred, newcred);
2748 crhold(newcred);
2749 #endif
2750 PROC_UNLOCK(p);
2751 #ifdef RCTL
2752 rctl_proc_ucred_changed(p, newcred);
2753 crfree(newcred);
2754 #endif
2755 prison_proc_relink(oldcred->cr_prison, pr, p);
2756 prison_deref(oldcred->cr_prison, drflags);
2757 crfree(oldcred);
2758
2759 /*
2760 * If the prison was killed while changing credentials, die along
2761 * with it.
2762 */
2763 if (!prison_isalive(pr)) {
2764 PROC_LOCK(p);
2765 kern_psignal(p, SIGKILL);
2766 PROC_UNLOCK(p);
2767 }
2768
2769 return (0);
2770
2771 e_unlock:
2772 VOP_UNLOCK(pr->pr_root);
2773 e_revert_osd:
2774 /* Tell modules this thread is still in its old jail after all. */
2775 sx_slock(&allprison_lock);
2776 drflags |= PD_LIST_SLOCKED;
2777 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td);
2778 prison_deref(pr, drflags);
2779 return (error);
2780 }
2781
2782 /*
2783 * Returns a locked prison instance, or NULL on failure.
2784 */
2785 struct prison *
prison_find(int prid)2786 prison_find(int prid)
2787 {
2788 struct prison *pr;
2789
2790 sx_assert(&allprison_lock, SX_LOCKED);
2791 TAILQ_FOREACH(pr, &allprison, pr_list) {
2792 if (pr->pr_id < prid)
2793 continue;
2794 if (pr->pr_id > prid)
2795 break;
2796 KASSERT(prison_isvalid(pr), ("Found invalid prison %p", pr));
2797 mtx_lock(&pr->pr_mtx);
2798 return (pr);
2799 }
2800 return (NULL);
2801 }
2802
2803 /*
2804 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
2805 */
2806 struct prison *
prison_find_child(struct prison * mypr,int prid)2807 prison_find_child(struct prison *mypr, int prid)
2808 {
2809 struct prison *pr;
2810 int descend;
2811
2812 sx_assert(&allprison_lock, SX_LOCKED);
2813 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2814 if (pr->pr_id == prid) {
2815 KASSERT(prison_isvalid(pr),
2816 ("Found invalid prison %p", pr));
2817 mtx_lock(&pr->pr_mtx);
2818 return (pr);
2819 }
2820 }
2821 return (NULL);
2822 }
2823
2824 /*
2825 * Look for the name relative to mypr. Returns a locked prison or NULL.
2826 */
2827 struct prison *
prison_find_name(struct prison * mypr,const char * name)2828 prison_find_name(struct prison *mypr, const char *name)
2829 {
2830 struct prison *pr, *deadpr;
2831 size_t mylen;
2832 int descend;
2833
2834 sx_assert(&allprison_lock, SX_LOCKED);
2835 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
2836 deadpr = NULL;
2837 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2838 if (!strcmp(pr->pr_name + mylen, name)) {
2839 KASSERT(prison_isvalid(pr),
2840 ("Found invalid prison %p", pr));
2841 if (prison_isalive(pr)) {
2842 mtx_lock(&pr->pr_mtx);
2843 return (pr);
2844 }
2845 deadpr = pr;
2846 }
2847 }
2848 /* There was no valid prison - perhaps there was a dying one. */
2849 if (deadpr != NULL)
2850 mtx_lock(&deadpr->pr_mtx);
2851 return (deadpr);
2852 }
2853
2854 /*
2855 * See if a prison has the specific flag set. The prison should be locked,
2856 * unless checking for flags that are only set at jail creation (such as
2857 * PR_IP4 and PR_IP6), or only the single bit is examined, without regard
2858 * to any other prison data.
2859 */
2860 bool
prison_flag(struct ucred * cred,unsigned flag)2861 prison_flag(struct ucred *cred, unsigned flag)
2862 {
2863
2864 return ((cred->cr_prison->pr_flags & flag) != 0);
2865 }
2866
2867 /*
2868 * See if a prison has the specific allow flag set.
2869 * The prison *should* be locked, or only a single bit is examined, without
2870 * regard to any other prison data.
2871 */
2872 bool
prison_allow(struct ucred * cred,unsigned flag)2873 prison_allow(struct ucred *cred, unsigned flag)
2874 {
2875
2876 return ((cred->cr_prison->pr_allow & flag) != 0);
2877 }
2878
2879 /*
2880 * Hold a prison reference, by incrementing pr_ref. It is generally
2881 * an error to hold a prison that does not already have a reference.
2882 * A prison record will remain valid as long as it has at least one
2883 * reference, and will not be removed as long as either the prison
2884 * mutex or the allprison lock is held (allprison_lock may be shared).
2885 */
2886 void
prison_hold_locked(struct prison * pr)2887 prison_hold_locked(struct prison *pr)
2888 {
2889
2890 /* Locking is no longer required. */
2891 prison_hold(pr);
2892 }
2893
2894 void
prison_hold(struct prison * pr)2895 prison_hold(struct prison *pr)
2896 {
2897 #ifdef INVARIANTS
2898 int was_valid = refcount_acquire_if_not_zero(&pr->pr_ref);
2899
2900 KASSERT(was_valid,
2901 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id));
2902 #else
2903 refcount_acquire(&pr->pr_ref);
2904 #endif
2905 }
2906
2907 /*
2908 * Remove a prison reference. If that was the last reference, the
2909 * prison will be removed (at a later time).
2910 */
2911 void
prison_free_locked(struct prison * pr)2912 prison_free_locked(struct prison *pr)
2913 {
2914
2915 mtx_assert(&pr->pr_mtx, MA_OWNED);
2916 /*
2917 * Locking is no longer required, but unlock because the caller
2918 * expects it.
2919 */
2920 mtx_unlock(&pr->pr_mtx);
2921 prison_free(pr);
2922 }
2923
2924 void
prison_free(struct prison * pr)2925 prison_free(struct prison *pr)
2926 {
2927
2928 KASSERT(refcount_load(&pr->pr_ref) > 0,
2929 ("Trying to free dead prison %p (jid=%d).",
2930 pr, pr->pr_id));
2931 if (!refcount_release_if_not_last(&pr->pr_ref)) {
2932 /*
2933 * Don't remove the last reference in this context,
2934 * in case there are locks held.
2935 */
2936 taskqueue_enqueue(taskqueue_jail_remove, &pr->pr_task);
2937 }
2938 }
2939
2940 static void
prison_free_not_last(struct prison * pr)2941 prison_free_not_last(struct prison *pr)
2942 {
2943 #ifdef INVARIANTS
2944 int lastref;
2945
2946 KASSERT(refcount_load(&pr->pr_ref) > 0,
2947 ("Trying to free dead prison %p (jid=%d).",
2948 pr, pr->pr_id));
2949 lastref = refcount_release(&pr->pr_ref);
2950 KASSERT(!lastref,
2951 ("prison_free_not_last freed last ref on prison %p (jid=%d).",
2952 pr, pr->pr_id));
2953 #else
2954 refcount_release(&pr->pr_ref);
2955 #endif
2956 }
2957
2958 /*
2959 * Hold a prison for user visibility, by incrementing pr_uref.
2960 * It is generally an error to hold a prison that isn't already
2961 * user-visible, except through the jail system calls. It is also
2962 * an error to hold an invalid prison. A prison record will remain
2963 * alive as long as it has at least one user reference, and will not
2964 * be set to the dying state until the prison mutex and allprison_lock
2965 * are both freed.
2966 */
2967 void
prison_proc_hold(struct prison * pr)2968 prison_proc_hold(struct prison *pr)
2969 {
2970 #ifdef INVARIANTS
2971 int was_alive = refcount_acquire_if_not_zero(&pr->pr_uref);
2972
2973 KASSERT(was_alive,
2974 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
2975 #else
2976 refcount_acquire(&pr->pr_uref);
2977 #endif
2978 }
2979
2980 /*
2981 * Remove a prison user reference. If it was the last reference, the
2982 * prison will be considered "dying", and may be removed once all of
2983 * its references are dropped.
2984 */
2985 void
prison_proc_free(struct prison * pr)2986 prison_proc_free(struct prison *pr)
2987 {
2988
2989 /*
2990 * Locking is only required when releasing the last reference.
2991 * This allows assurance that a locked prison will remain alive
2992 * until it is unlocked.
2993 */
2994 KASSERT(refcount_load(&pr->pr_uref) > 0,
2995 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
2996 if (!refcount_release_if_not_last(&pr->pr_uref)) {
2997 /*
2998 * Don't remove the last user reference in this context,
2999 * which is expected to be a process that is not only locked,
3000 * but also half dead. Add a reference so any calls to
3001 * prison_free() won't re-submit the task.
3002 */
3003 prison_hold(pr);
3004 mtx_lock(&pr->pr_mtx);
3005 KASSERT(!(pr->pr_flags & PR_COMPLETE_PROC),
3006 ("Redundant last reference in prison_proc_free (jid=%d)",
3007 pr->pr_id));
3008 pr->pr_flags |= PR_COMPLETE_PROC;
3009 mtx_unlock(&pr->pr_mtx);
3010 taskqueue_enqueue(taskqueue_jail_remove, &pr->pr_task);
3011 }
3012 }
3013
3014 static void
prison_proc_free_not_last(struct prison * pr)3015 prison_proc_free_not_last(struct prison *pr)
3016 {
3017 #ifdef INVARIANTS
3018 int lastref;
3019
3020 KASSERT(refcount_load(&pr->pr_uref) > 0,
3021 ("Trying to free dead prison %p (jid=%d).",
3022 pr, pr->pr_id));
3023 lastref = refcount_release(&pr->pr_uref);
3024 KASSERT(!lastref,
3025 ("prison_proc_free_not_last freed last uref on prison %p (jid=%d).",
3026 pr, pr->pr_id));
3027 #else
3028 refcount_release(&pr->pr_uref);
3029 #endif
3030 }
3031
3032 void
prison_proc_link(struct prison * pr,struct proc * p)3033 prison_proc_link(struct prison *pr, struct proc *p)
3034 {
3035
3036 sx_assert(&allproc_lock, SA_XLOCKED);
3037 LIST_INSERT_HEAD(&pr->pr_proclist, p, p_jaillist);
3038 }
3039
3040 void
prison_proc_unlink(struct prison * pr,struct proc * p)3041 prison_proc_unlink(struct prison *pr, struct proc *p)
3042 {
3043
3044 sx_assert(&allproc_lock, SA_XLOCKED);
3045 LIST_REMOVE(p, p_jaillist);
3046 }
3047
3048 static void
prison_proc_relink(struct prison * opr,struct prison * npr,struct proc * p)3049 prison_proc_relink(struct prison *opr, struct prison *npr, struct proc *p)
3050 {
3051
3052 sx_xlock(&allproc_lock);
3053 prison_proc_unlink(opr, p);
3054 prison_proc_link(npr, p);
3055 sx_xunlock(&allproc_lock);
3056 }
3057
3058 /*
3059 * Complete a call to either prison_free or prison_proc_free.
3060 */
3061 static void
prison_complete(void * context,int pending)3062 prison_complete(void *context, int pending)
3063 {
3064 struct prison *pr = context;
3065 int drflags;
3066
3067 /*
3068 * This could be called to release the last reference, or the last
3069 * user reference (plus the reference held in prison_proc_free).
3070 */
3071 drflags = prison_lock_xlock(pr, PD_DEREF);
3072 if (pr->pr_flags & PR_COMPLETE_PROC) {
3073 pr->pr_flags &= ~PR_COMPLETE_PROC;
3074 drflags |= PD_DEUREF;
3075 }
3076 prison_deref(pr, drflags);
3077 }
3078
3079 static void
prison_kill_processes_cb(struct proc * p,void * arg __unused)3080 prison_kill_processes_cb(struct proc *p, void *arg __unused)
3081 {
3082
3083 kern_psignal(p, SIGKILL);
3084 }
3085
3086 /*
3087 * Note the iteration does not guarantee acting on all processes.
3088 * Most notably there may be fork or jail_attach in progress.
3089 */
3090 void
prison_proc_iterate(struct prison * pr,void (* cb)(struct proc *,void *),void * cbarg)3091 prison_proc_iterate(struct prison *pr, void (*cb)(struct proc *, void *),
3092 void *cbarg)
3093 {
3094 struct prison *ppr;
3095 struct proc *p;
3096
3097 if (atomic_load_int(&pr->pr_childcount) == 0) {
3098 sx_slock(&allproc_lock);
3099 LIST_FOREACH(p, &pr->pr_proclist, p_jaillist) {
3100 if (p->p_state == PRS_NEW)
3101 continue;
3102 PROC_LOCK(p);
3103 cb(p, cbarg);
3104 PROC_UNLOCK(p);
3105 }
3106 sx_sunlock(&allproc_lock);
3107 if (atomic_load_int(&pr->pr_childcount) == 0)
3108 return;
3109 /*
3110 * Some jails popped up during the iteration, fall through to a
3111 * system-wide search.
3112 */
3113 }
3114
3115 sx_slock(&allproc_lock);
3116 FOREACH_PROC_IN_SYSTEM(p) {
3117 PROC_LOCK(p);
3118 if (p->p_state != PRS_NEW && p->p_ucred != NULL) {
3119 for (ppr = p->p_ucred->cr_prison; ppr != NULL;
3120 ppr = ppr->pr_parent) {
3121 if (ppr == pr) {
3122 cb(p, cbarg);
3123 break;
3124 }
3125 }
3126 }
3127 PROC_UNLOCK(p);
3128 }
3129 sx_sunlock(&allproc_lock);
3130 }
3131
3132 /*
3133 * Remove a prison reference and/or user reference (usually).
3134 * This assumes context that allows sleeping (for allprison_lock),
3135 * with no non-sleeping locks held, except perhaps the prison itself.
3136 * If there are no more references, release and delist the prison.
3137 * On completion, the prison lock and the allprison lock are both
3138 * unlocked.
3139 */
3140 static void
prison_deref(struct prison * pr,int flags)3141 prison_deref(struct prison *pr, int flags)
3142 {
3143 struct prisonlist freeprison;
3144 struct prison *killpr, *rpr, *ppr, *tpr;
3145
3146 killpr = NULL;
3147 TAILQ_INIT(&freeprison);
3148 /*
3149 * Release this prison as requested, which may cause its parent
3150 * to be released, and then maybe its grandparent, etc.
3151 */
3152 for (;;) {
3153 if (flags & PD_KILL) {
3154 /* Kill the prison and its descendents. */
3155 KASSERT(pr != &prison0,
3156 ("prison_deref trying to kill prison0"));
3157 if (!(flags & PD_DEREF)) {
3158 prison_hold(pr);
3159 flags |= PD_DEREF;
3160 }
3161 flags = prison_lock_xlock(pr, flags);
3162 prison_deref_kill(pr, &freeprison);
3163 }
3164 if (flags & PD_DEUREF) {
3165 /* Drop a user reference. */
3166 KASSERT(refcount_load(&pr->pr_uref) > 0,
3167 ("prison_deref PD_DEUREF on a dead prison (jid=%d)",
3168 pr->pr_id));
3169 if (!refcount_release_if_not_last(&pr->pr_uref)) {
3170 if (!(flags & PD_DEREF)) {
3171 prison_hold(pr);
3172 flags |= PD_DEREF;
3173 }
3174 flags = prison_lock_xlock(pr, flags);
3175 if (refcount_release(&pr->pr_uref) &&
3176 pr->pr_state == PRISON_STATE_ALIVE) {
3177 /*
3178 * When the last user references goes,
3179 * this becomes a dying prison.
3180 */
3181 KASSERT(
3182 refcount_load(&prison0.pr_uref) > 0,
3183 ("prison0 pr_uref=0"));
3184 pr->pr_state = PRISON_STATE_DYING;
3185 mtx_unlock(&pr->pr_mtx);
3186 flags &= ~PD_LOCKED;
3187 prison_cleanup(pr);
3188 }
3189 }
3190 }
3191 if (flags & PD_KILL) {
3192 /*
3193 * Any remaining user references are probably processes
3194 * that need to be killed, either in this prison or its
3195 * descendants.
3196 */
3197 if (refcount_load(&pr->pr_uref) > 0)
3198 killpr = pr;
3199 /* Make sure the parent prison doesn't get killed. */
3200 flags &= ~PD_KILL;
3201 }
3202 if (flags & PD_DEREF) {
3203 /* Drop a reference. */
3204 KASSERT(refcount_load(&pr->pr_ref) > 0,
3205 ("prison_deref PD_DEREF on a dead prison (jid=%d)",
3206 pr->pr_id));
3207 if (!refcount_release_if_not_last(&pr->pr_ref)) {
3208 flags = prison_lock_xlock(pr, flags);
3209 if (refcount_release(&pr->pr_ref)) {
3210 /*
3211 * When the last reference goes,
3212 * unlink the prison and set it aside.
3213 */
3214 KASSERT(
3215 refcount_load(&pr->pr_uref) == 0,
3216 ("prison_deref: last ref, "
3217 "but still has %d urefs (jid=%d)",
3218 pr->pr_uref, pr->pr_id));
3219 KASSERT(
3220 refcount_load(&prison0.pr_ref) != 0,
3221 ("prison0 pr_ref=0"));
3222 pr->pr_state = PRISON_STATE_INVALID;
3223 TAILQ_REMOVE(&allprison, pr, pr_list);
3224 LIST_REMOVE(pr, pr_sibling);
3225 TAILQ_INSERT_TAIL(&freeprison, pr,
3226 pr_list);
3227 for (ppr = pr->pr_parent;
3228 ppr != NULL;
3229 ppr = ppr->pr_parent)
3230 ppr->pr_childcount--;
3231 /*
3232 * Removing a prison frees references
3233 * from its parent.
3234 */
3235 ppr = pr->pr_parent;
3236 pr->pr_parent = NULL;
3237 mtx_unlock(&pr->pr_mtx);
3238
3239 pr = ppr;
3240 flags &= ~PD_LOCKED;
3241 flags |= PD_DEREF | PD_DEUREF;
3242 continue;
3243 }
3244 }
3245 }
3246 break;
3247 }
3248
3249 /* Release all the prison locks. */
3250 if (flags & PD_LOCKED)
3251 mtx_unlock(&pr->pr_mtx);
3252 if (flags & PD_LIST_SLOCKED)
3253 sx_sunlock(&allprison_lock);
3254 else if (flags & PD_LIST_XLOCKED)
3255 sx_xunlock(&allprison_lock);
3256
3257 /* Kill any processes attached to a killed prison. */
3258 if (killpr != NULL)
3259 prison_proc_iterate(killpr, prison_kill_processes_cb, NULL);
3260
3261 /*
3262 * Finish removing any unreferenced prisons, which couldn't happen
3263 * while allprison_lock was held (to avoid a LOR on vrele).
3264 */
3265 TAILQ_FOREACH_SAFE(rpr, &freeprison, pr_list, tpr) {
3266 #ifdef VIMAGE
3267 if (rpr->pr_flags & PR_VNET)
3268 vnet_destroy(rpr->pr_vnet);
3269 #endif
3270 if (rpr->pr_root != NULL)
3271 vrele(rpr->pr_root);
3272 mtx_destroy(&rpr->pr_mtx);
3273 #ifdef INET
3274 prison_ip_free(rpr->pr_addrs[PR_INET]);
3275 #endif
3276 #ifdef INET6
3277 prison_ip_free(rpr->pr_addrs[PR_INET6]);
3278 #endif
3279 if (rpr->pr_cpuset != NULL)
3280 cpuset_rel(rpr->pr_cpuset);
3281 osd_jail_exit(rpr);
3282 #ifdef RACCT
3283 if (racct_enable)
3284 prison_racct_detach(rpr);
3285 #endif
3286 TAILQ_REMOVE(&freeprison, rpr, pr_list);
3287 free(rpr, M_PRISON);
3288 }
3289 }
3290
3291 /*
3292 * Kill the prison and its descendants. Mark them as dying, clear the
3293 * persist flag, and call module remove methods.
3294 */
3295 static void
prison_deref_kill(struct prison * pr,struct prisonlist * freeprison)3296 prison_deref_kill(struct prison *pr, struct prisonlist *freeprison)
3297 {
3298 struct prison *cpr, *ppr, *rpr;
3299 bool descend;
3300
3301 /*
3302 * Unlike the descendants, the target prison can be killed
3303 * even if it is currently dying. This is useful for failed
3304 * creation in jail_set(2).
3305 */
3306 KASSERT(refcount_load(&pr->pr_ref) > 0,
3307 ("Trying to kill dead prison %p (jid=%d).",
3308 pr, pr->pr_id));
3309 refcount_acquire(&pr->pr_uref);
3310 pr->pr_state = PRISON_STATE_DYING;
3311 mtx_unlock(&pr->pr_mtx);
3312
3313 rpr = NULL;
3314 FOREACH_PRISON_DESCENDANT_PRE_POST(pr, cpr, descend) {
3315 if (descend) {
3316 if (!prison_isalive(cpr)) {
3317 descend = false;
3318 continue;
3319 }
3320 prison_hold(cpr);
3321 prison_proc_hold(cpr);
3322 mtx_lock(&cpr->pr_mtx);
3323 cpr->pr_state = PRISON_STATE_DYING;
3324 cpr->pr_flags |= PR_REMOVE;
3325 mtx_unlock(&cpr->pr_mtx);
3326 continue;
3327 }
3328 if (!(cpr->pr_flags & PR_REMOVE))
3329 continue;
3330 prison_cleanup(cpr);
3331 mtx_lock(&cpr->pr_mtx);
3332 cpr->pr_flags &= ~PR_REMOVE;
3333 if (cpr->pr_flags & PR_PERSIST) {
3334 cpr->pr_flags &= ~PR_PERSIST;
3335 prison_proc_free_not_last(cpr);
3336 prison_free_not_last(cpr);
3337 }
3338 (void)refcount_release(&cpr->pr_uref);
3339 if (refcount_release(&cpr->pr_ref)) {
3340 /*
3341 * When the last reference goes, unlink the prison
3342 * and set it aside for prison_deref() to handle.
3343 * Delay unlinking the sibling list to keep the loop
3344 * safe.
3345 */
3346 if (rpr != NULL)
3347 LIST_REMOVE(rpr, pr_sibling);
3348 rpr = cpr;
3349 rpr->pr_state = PRISON_STATE_INVALID;
3350 TAILQ_REMOVE(&allprison, rpr, pr_list);
3351 TAILQ_INSERT_TAIL(freeprison, rpr, pr_list);
3352 /*
3353 * Removing a prison frees references from its parent.
3354 */
3355 ppr = rpr->pr_parent;
3356 prison_proc_free_not_last(ppr);
3357 prison_free_not_last(ppr);
3358 for (; ppr != NULL; ppr = ppr->pr_parent)
3359 ppr->pr_childcount--;
3360 }
3361 mtx_unlock(&cpr->pr_mtx);
3362 }
3363 if (rpr != NULL)
3364 LIST_REMOVE(rpr, pr_sibling);
3365
3366 prison_cleanup(pr);
3367 mtx_lock(&pr->pr_mtx);
3368 if (pr->pr_flags & PR_PERSIST) {
3369 pr->pr_flags &= ~PR_PERSIST;
3370 prison_proc_free_not_last(pr);
3371 prison_free_not_last(pr);
3372 }
3373 (void)refcount_release(&pr->pr_uref);
3374 }
3375
3376 /*
3377 * Given the current locking state in the flags, make sure allprison_lock
3378 * is held exclusive, and the prison is locked. Return flags indicating
3379 * the new state.
3380 */
3381 static int
prison_lock_xlock(struct prison * pr,int flags)3382 prison_lock_xlock(struct prison *pr, int flags)
3383 {
3384
3385 if (!(flags & PD_LIST_XLOCKED)) {
3386 /*
3387 * Get allprison_lock, which may be an upgrade,
3388 * and may require unlocking the prison.
3389 */
3390 if (flags & PD_LOCKED) {
3391 mtx_unlock(&pr->pr_mtx);
3392 flags &= ~PD_LOCKED;
3393 }
3394 if (flags & PD_LIST_SLOCKED) {
3395 if (!sx_try_upgrade(&allprison_lock)) {
3396 sx_sunlock(&allprison_lock);
3397 sx_xlock(&allprison_lock);
3398 }
3399 flags &= ~PD_LIST_SLOCKED;
3400 } else
3401 sx_xlock(&allprison_lock);
3402 flags |= PD_LIST_XLOCKED;
3403 }
3404 if (!(flags & PD_LOCKED)) {
3405 /* Lock the prison mutex. */
3406 mtx_lock(&pr->pr_mtx);
3407 flags |= PD_LOCKED;
3408 }
3409 return flags;
3410 }
3411
3412 /*
3413 * Release a prison's resources when it starts dying (when the last user
3414 * reference is dropped, or when it is killed).
3415 */
3416 static void
prison_cleanup(struct prison * pr)3417 prison_cleanup(struct prison *pr)
3418 {
3419 sx_assert(&allprison_lock, SA_XLOCKED);
3420 mtx_assert(&pr->pr_mtx, MA_NOTOWNED);
3421 vfs_exjail_delete(pr);
3422 shm_remove_prison(pr);
3423 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
3424 }
3425
3426 /*
3427 * Set or clear a permission bit in the pr_allow field, passing restrictions
3428 * (cleared permission) down to child jails.
3429 */
3430 void
prison_set_allow(struct ucred * cred,unsigned flag,int enable)3431 prison_set_allow(struct ucred *cred, unsigned flag, int enable)
3432 {
3433 struct prison *pr;
3434
3435 pr = cred->cr_prison;
3436 sx_slock(&allprison_lock);
3437 mtx_lock(&pr->pr_mtx);
3438 prison_set_allow_locked(pr, flag, enable);
3439 mtx_unlock(&pr->pr_mtx);
3440 sx_sunlock(&allprison_lock);
3441 }
3442
3443 static void
prison_set_allow_locked(struct prison * pr,unsigned flag,int enable)3444 prison_set_allow_locked(struct prison *pr, unsigned flag, int enable)
3445 {
3446 struct prison *cpr;
3447 int descend;
3448
3449 if (enable != 0)
3450 pr->pr_allow |= flag;
3451 else {
3452 pr->pr_allow &= ~flag;
3453 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
3454 cpr->pr_allow &= ~flag;
3455 }
3456 }
3457
3458 /*
3459 * Check if a jail supports the given address family.
3460 *
3461 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
3462 * if not.
3463 */
3464 int
prison_check_af(struct ucred * cred,int af)3465 prison_check_af(struct ucred *cred, int af)
3466 {
3467 struct prison *pr;
3468 int error;
3469
3470 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3471
3472 pr = cred->cr_prison;
3473 #ifdef VIMAGE
3474 /* Prisons with their own network stack are not limited. */
3475 if (prison_owns_vnet(pr))
3476 return (0);
3477 #endif
3478
3479 error = 0;
3480 switch (af)
3481 {
3482 #ifdef INET
3483 case AF_INET:
3484 if (pr->pr_flags & PR_IP4)
3485 {
3486 mtx_lock(&pr->pr_mtx);
3487 if ((pr->pr_flags & PR_IP4) &&
3488 pr->pr_addrs[PR_INET] == NULL)
3489 error = EAFNOSUPPORT;
3490 mtx_unlock(&pr->pr_mtx);
3491 }
3492 break;
3493 #endif
3494 #ifdef INET6
3495 case AF_INET6:
3496 if (pr->pr_flags & PR_IP6)
3497 {
3498 mtx_lock(&pr->pr_mtx);
3499 if ((pr->pr_flags & PR_IP6) &&
3500 pr->pr_addrs[PR_INET6] == NULL)
3501 error = EAFNOSUPPORT;
3502 mtx_unlock(&pr->pr_mtx);
3503 }
3504 break;
3505 #endif
3506 case AF_LOCAL:
3507 case AF_ROUTE:
3508 case AF_NETLINK:
3509 break;
3510 default:
3511 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
3512 error = EAFNOSUPPORT;
3513 }
3514 return (error);
3515 }
3516
3517 /*
3518 * Check if given address belongs to the jail referenced by cred (wrapper to
3519 * prison_check_ip[46]).
3520 *
3521 * Returns 0 if jail doesn't restrict the address family or if address belongs
3522 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
3523 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
3524 */
3525 int
prison_if(struct ucred * cred,const struct sockaddr * sa)3526 prison_if(struct ucred *cred, const struct sockaddr *sa)
3527 {
3528 #ifdef INET
3529 const struct sockaddr_in *sai;
3530 #endif
3531 #ifdef INET6
3532 const struct sockaddr_in6 *sai6;
3533 #endif
3534 int error;
3535
3536 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3537 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
3538
3539 #ifdef VIMAGE
3540 if (prison_owns_vnet(cred->cr_prison))
3541 return (0);
3542 #endif
3543
3544 error = 0;
3545 switch (sa->sa_family)
3546 {
3547 #ifdef INET
3548 case AF_INET:
3549 sai = (const struct sockaddr_in *)sa;
3550 error = prison_check_ip4(cred, &sai->sin_addr);
3551 break;
3552 #endif
3553 #ifdef INET6
3554 case AF_INET6:
3555 sai6 = (const struct sockaddr_in6 *)sa;
3556 error = prison_check_ip6(cred, &sai6->sin6_addr);
3557 break;
3558 #endif
3559 default:
3560 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
3561 error = EAFNOSUPPORT;
3562 }
3563 return (error);
3564 }
3565
3566 /*
3567 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
3568 */
3569 int
prison_check(struct ucred * cred1,struct ucred * cred2)3570 prison_check(struct ucred *cred1, struct ucred *cred2)
3571 {
3572
3573 return ((cred1->cr_prison == cred2->cr_prison ||
3574 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
3575 }
3576
3577 /*
3578 * For mountd/nfsd to run within a prison, it must be:
3579 * - A vnet prison.
3580 * - PR_ALLOW_NFSD must be set on it.
3581 * - The root directory (pr_root) of the prison must be
3582 * a file system mount point, so the mountd can hang
3583 * export information on it.
3584 * - The prison's enforce_statfs cannot be 0, so that
3585 * mountd(8) can do exports.
3586 */
3587 bool
prison_check_nfsd(struct ucred * cred)3588 prison_check_nfsd(struct ucred *cred)
3589 {
3590
3591 if (jailed_without_vnet(cred))
3592 return (false);
3593 if (!prison_allow(cred, PR_ALLOW_NFSD))
3594 return (false);
3595 if ((cred->cr_prison->pr_root->v_vflag & VV_ROOT) == 0)
3596 return (false);
3597 if (cred->cr_prison->pr_enforce_statfs == 0)
3598 return (false);
3599 return (true);
3600 }
3601
3602 /*
3603 * Return true if p2 is a child of p1, otherwise false.
3604 */
3605 bool
prison_ischild(struct prison * pr1,struct prison * pr2)3606 prison_ischild(struct prison *pr1, struct prison *pr2)
3607 {
3608
3609 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
3610 if (pr1 == pr2)
3611 return (true);
3612 return (false);
3613 }
3614
3615 /*
3616 * Return true if the prison is currently alive. A prison is alive if it
3617 * holds user references and it isn't being removed.
3618 */
3619 bool
prison_isalive(const struct prison * pr)3620 prison_isalive(const struct prison *pr)
3621 {
3622
3623 if (__predict_false(pr->pr_state != PRISON_STATE_ALIVE))
3624 return (false);
3625 return (true);
3626 }
3627
3628 /*
3629 * Return true if the prison is currently valid. A prison is valid if it has
3630 * been fully created, and is not being destroyed. Note that dying prisons
3631 * are still considered valid. Invalid prisons won't be found under normal
3632 * circumstances, as they're only put in that state by functions that have
3633 * an exclusive hold on allprison_lock.
3634 */
3635 bool
prison_isvalid(struct prison * pr)3636 prison_isvalid(struct prison *pr)
3637 {
3638
3639 if (__predict_false(pr->pr_state == PRISON_STATE_INVALID))
3640 return (false);
3641 if (__predict_false(refcount_load(&pr->pr_ref) == 0))
3642 return (false);
3643 return (true);
3644 }
3645
3646 /*
3647 * Return true if the passed credential is in a jail and that jail does not
3648 * have its own virtual network stack, otherwise false.
3649 */
3650 bool
jailed_without_vnet(struct ucred * cred)3651 jailed_without_vnet(struct ucred *cred)
3652 {
3653
3654 if (!jailed(cred))
3655 return (false);
3656 #ifdef VIMAGE
3657 if (prison_owns_vnet(cred->cr_prison))
3658 return (false);
3659 #endif
3660
3661 return (true);
3662 }
3663
3664 /*
3665 * Return the correct hostname (domainname, et al) for the passed credential.
3666 */
3667 void
getcredhostname(struct ucred * cred,char * buf,size_t size)3668 getcredhostname(struct ucred *cred, char *buf, size_t size)
3669 {
3670 struct prison *pr;
3671
3672 /*
3673 * A NULL credential can be used to shortcut to the physical
3674 * system's hostname.
3675 */
3676 pr = (cred != NULL) ? cred->cr_prison : &prison0;
3677 mtx_lock(&pr->pr_mtx);
3678 strlcpy(buf, pr->pr_hostname, size);
3679 mtx_unlock(&pr->pr_mtx);
3680 }
3681
3682 void
getcreddomainname(struct ucred * cred,char * buf,size_t size)3683 getcreddomainname(struct ucred *cred, char *buf, size_t size)
3684 {
3685
3686 mtx_lock(&cred->cr_prison->pr_mtx);
3687 strlcpy(buf, cred->cr_prison->pr_domainname, size);
3688 mtx_unlock(&cred->cr_prison->pr_mtx);
3689 }
3690
3691 void
getcredhostuuid(struct ucred * cred,char * buf,size_t size)3692 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
3693 {
3694
3695 mtx_lock(&cred->cr_prison->pr_mtx);
3696 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
3697 mtx_unlock(&cred->cr_prison->pr_mtx);
3698 }
3699
3700 void
getcredhostid(struct ucred * cred,unsigned long * hostid)3701 getcredhostid(struct ucred *cred, unsigned long *hostid)
3702 {
3703
3704 mtx_lock(&cred->cr_prison->pr_mtx);
3705 *hostid = cred->cr_prison->pr_hostid;
3706 mtx_unlock(&cred->cr_prison->pr_mtx);
3707 }
3708
3709 void
getjailname(struct ucred * cred,char * name,size_t len)3710 getjailname(struct ucred *cred, char *name, size_t len)
3711 {
3712
3713 mtx_lock(&cred->cr_prison->pr_mtx);
3714 strlcpy(name, cred->cr_prison->pr_name, len);
3715 mtx_unlock(&cred->cr_prison->pr_mtx);
3716 }
3717
3718 #ifdef VIMAGE
3719 /*
3720 * Determine whether the prison owns its VNET.
3721 */
3722 bool
prison_owns_vnet(struct prison * pr)3723 prison_owns_vnet(struct prison *pr)
3724 {
3725
3726 /*
3727 * vnets cannot be added/removed after jail creation,
3728 * so no need to lock here.
3729 */
3730 return ((pr->pr_flags & PR_VNET) != 0);
3731 }
3732 #endif
3733
3734 /*
3735 * Determine whether the subject represented by cred can "see"
3736 * status of a mount point.
3737 * Returns: 0 for permitted, ENOENT otherwise.
3738 * XXX: This function should be called cr_canseemount() and should be
3739 * placed in kern_prot.c.
3740 */
3741 int
prison_canseemount(struct ucred * cred,struct mount * mp)3742 prison_canseemount(struct ucred *cred, struct mount *mp)
3743 {
3744 struct prison *pr;
3745 struct statfs *sp;
3746 size_t len;
3747
3748 pr = cred->cr_prison;
3749 if (pr->pr_enforce_statfs == 0)
3750 return (0);
3751 if (pr->pr_root->v_mount == mp)
3752 return (0);
3753 if (pr->pr_enforce_statfs == 2)
3754 return (ENOENT);
3755 /*
3756 * If jail's chroot directory is set to "/" we should be able to see
3757 * all mount-points from inside a jail.
3758 * This is ugly check, but this is the only situation when jail's
3759 * directory ends with '/'.
3760 */
3761 if (strcmp(pr->pr_path, "/") == 0)
3762 return (0);
3763 len = strlen(pr->pr_path);
3764 sp = &mp->mnt_stat;
3765 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
3766 return (ENOENT);
3767 /*
3768 * Be sure that we don't have situation where jail's root directory
3769 * is "/some/path" and mount point is "/some/pathpath".
3770 */
3771 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
3772 return (ENOENT);
3773 return (0);
3774 }
3775
3776 void
prison_enforce_statfs(struct ucred * cred,struct mount * mp,struct statfs * sp)3777 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
3778 {
3779 char jpath[MAXPATHLEN];
3780 struct prison *pr;
3781 size_t len;
3782
3783 pr = cred->cr_prison;
3784 if (pr->pr_enforce_statfs == 0)
3785 return;
3786 if (prison_canseemount(cred, mp) != 0) {
3787 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3788 strlcpy(sp->f_mntonname, "[restricted]",
3789 sizeof(sp->f_mntonname));
3790 return;
3791 }
3792 if (pr->pr_root->v_mount == mp) {
3793 /*
3794 * Clear current buffer data, so we are sure nothing from
3795 * the valid path left there.
3796 */
3797 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3798 *sp->f_mntonname = '/';
3799 return;
3800 }
3801 /*
3802 * If jail's chroot directory is set to "/" we should be able to see
3803 * all mount-points from inside a jail.
3804 */
3805 if (strcmp(pr->pr_path, "/") == 0)
3806 return;
3807 len = strlen(pr->pr_path);
3808 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
3809 /*
3810 * Clear current buffer data, so we are sure nothing from
3811 * the valid path left there.
3812 */
3813 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3814 if (*jpath == '\0') {
3815 /* Should never happen. */
3816 *sp->f_mntonname = '/';
3817 } else {
3818 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
3819 }
3820 }
3821
3822 /*
3823 * Check with permission for a specific privilege is granted within jail. We
3824 * have a specific list of accepted privileges; the rest are denied.
3825 */
3826 int
prison_priv_check(struct ucred * cred,int priv)3827 prison_priv_check(struct ucred *cred, int priv)
3828 {
3829 struct prison *pr;
3830 int error;
3831
3832 /*
3833 * Some policies have custom handlers. This routine should not be
3834 * called for them. See priv_check_cred().
3835 */
3836 switch (priv) {
3837 case PRIV_VFS_LOOKUP:
3838 case PRIV_VFS_GENERATION:
3839 KASSERT(0, ("prison_priv_check instead of a custom handler "
3840 "called for %d\n", priv));
3841 }
3842
3843 if (!jailed(cred))
3844 return (0);
3845
3846 #ifdef VIMAGE
3847 /*
3848 * Privileges specific to prisons with a virtual network stack.
3849 * There might be a duplicate entry here in case the privilege
3850 * is only granted conditionally in the legacy jail case.
3851 */
3852 switch (priv) {
3853 /*
3854 * NFS-specific privileges.
3855 */
3856 case PRIV_NFS_DAEMON:
3857 case PRIV_VFS_GETFH:
3858 case PRIV_VFS_MOUNT_EXPORTED:
3859 if (!prison_check_nfsd(cred))
3860 return (EPERM);
3861 #ifdef notyet
3862 case PRIV_NFS_LOCKD:
3863 #endif
3864 /*
3865 * Network stack privileges.
3866 */
3867 case PRIV_NET_BRIDGE:
3868 case PRIV_NET_GRE:
3869 case PRIV_NET_BPF:
3870 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
3871 case PRIV_NET_ROUTE:
3872 case PRIV_NET_TAP:
3873 case PRIV_NET_SETIFMTU:
3874 case PRIV_NET_SETIFFLAGS:
3875 case PRIV_NET_SETIFCAP:
3876 case PRIV_NET_SETIFDESCR:
3877 case PRIV_NET_SETIFNAME :
3878 case PRIV_NET_SETIFMETRIC:
3879 case PRIV_NET_SETIFPHYS:
3880 case PRIV_NET_SETIFMAC:
3881 case PRIV_NET_SETLANPCP:
3882 case PRIV_NET_ADDMULTI:
3883 case PRIV_NET_DELMULTI:
3884 case PRIV_NET_HWIOCTL:
3885 case PRIV_NET_SETLLADDR:
3886 case PRIV_NET_ADDIFGROUP:
3887 case PRIV_NET_DELIFGROUP:
3888 case PRIV_NET_IFCREATE:
3889 case PRIV_NET_IFDESTROY:
3890 case PRIV_NET_ADDIFADDR:
3891 case PRIV_NET_DELIFADDR:
3892 case PRIV_NET_LAGG:
3893 case PRIV_NET_GIF:
3894 case PRIV_NET_SETIFVNET:
3895 case PRIV_NET_SETIFFIB:
3896 case PRIV_NET_OVPN:
3897 case PRIV_NET_ME:
3898 case PRIV_NET_WG:
3899
3900 /*
3901 * 802.11-related privileges.
3902 */
3903 case PRIV_NET80211_VAP_GETKEY:
3904 case PRIV_NET80211_VAP_MANAGE:
3905
3906 #ifdef notyet
3907 /*
3908 * ATM privileges.
3909 */
3910 case PRIV_NETATM_CFG:
3911 case PRIV_NETATM_ADD:
3912 case PRIV_NETATM_DEL:
3913 case PRIV_NETATM_SET:
3914
3915 /*
3916 * Bluetooth privileges.
3917 */
3918 case PRIV_NETBLUETOOTH_RAW:
3919 #endif
3920
3921 /*
3922 * Netgraph and netgraph module privileges.
3923 */
3924 case PRIV_NETGRAPH_CONTROL:
3925 #ifdef notyet
3926 case PRIV_NETGRAPH_TTY:
3927 #endif
3928
3929 /*
3930 * IPv4 and IPv6 privileges.
3931 */
3932 case PRIV_NETINET_IPFW:
3933 case PRIV_NETINET_DIVERT:
3934 case PRIV_NETINET_PF:
3935 case PRIV_NETINET_DUMMYNET:
3936 case PRIV_NETINET_CARP:
3937 case PRIV_NETINET_MROUTE:
3938 case PRIV_NETINET_RAW:
3939 case PRIV_NETINET_ADDRCTRL6:
3940 case PRIV_NETINET_ND6:
3941 case PRIV_NETINET_SCOPE6:
3942 case PRIV_NETINET_ALIFETIME6:
3943 case PRIV_NETINET_IPSEC:
3944 case PRIV_NETINET_BINDANY:
3945
3946 #ifdef notyet
3947 /*
3948 * NCP privileges.
3949 */
3950 case PRIV_NETNCP:
3951
3952 /*
3953 * SMB privileges.
3954 */
3955 case PRIV_NETSMB:
3956 #endif
3957
3958 /*
3959 * No default: or deny here.
3960 * In case of no permit fall through to next switch().
3961 */
3962 if (cred->cr_prison->pr_flags & PR_VNET)
3963 return (0);
3964 }
3965 #endif /* VIMAGE */
3966
3967 switch (priv) {
3968 /*
3969 * Allow ktrace privileges for root in jail.
3970 */
3971 case PRIV_KTRACE:
3972
3973 #if 0
3974 /*
3975 * Allow jailed processes to configure audit identity and
3976 * submit audit records (login, etc). In the future we may
3977 * want to further refine the relationship between audit and
3978 * jail.
3979 */
3980 case PRIV_AUDIT_GETAUDIT:
3981 case PRIV_AUDIT_SETAUDIT:
3982 case PRIV_AUDIT_SUBMIT:
3983 #endif
3984
3985 /*
3986 * Allow jailed processes to manipulate process UNIX
3987 * credentials in any way they see fit.
3988 */
3989 case PRIV_CRED_SETCRED:
3990 case PRIV_CRED_SETUID:
3991 case PRIV_CRED_SETEUID:
3992 case PRIV_CRED_SETGID:
3993 case PRIV_CRED_SETEGID:
3994 case PRIV_CRED_SETGROUPS:
3995 case PRIV_CRED_SETREUID:
3996 case PRIV_CRED_SETREGID:
3997 case PRIV_CRED_SETRESUID:
3998 case PRIV_CRED_SETRESGID:
3999
4000 /*
4001 * Jail implements visibility constraints already, so allow
4002 * jailed root to override uid/gid-based constraints.
4003 */
4004 case PRIV_SEEOTHERGIDS:
4005 case PRIV_SEEOTHERUIDS:
4006 case PRIV_SEEJAILPROC:
4007
4008 /*
4009 * Jail implements inter-process debugging limits already, so
4010 * allow jailed root various debugging privileges.
4011 */
4012 case PRIV_DEBUG_DIFFCRED:
4013 case PRIV_DEBUG_SUGID:
4014 case PRIV_DEBUG_UNPRIV:
4015 case PRIV_DEBUG_DIFFJAIL:
4016
4017 /*
4018 * Allow jail to set various resource limits and login
4019 * properties, and for now, exceed process resource limits.
4020 */
4021 case PRIV_PROC_LIMIT:
4022 case PRIV_PROC_SETLOGIN:
4023 case PRIV_PROC_SETRLIMIT:
4024
4025 /*
4026 * Debuggers should work in jails.
4027 */
4028 case PRIV_PROC_MEM_WRITE:
4029
4030 /*
4031 * System V and POSIX IPC privileges are granted in jail.
4032 */
4033 case PRIV_IPC_READ:
4034 case PRIV_IPC_WRITE:
4035 case PRIV_IPC_ADMIN:
4036 case PRIV_IPC_MSGSIZE:
4037 case PRIV_MQ_ADMIN:
4038
4039 /*
4040 * Jail operations within a jail work on child jails.
4041 */
4042 case PRIV_JAIL_ATTACH:
4043 case PRIV_JAIL_SET:
4044 case PRIV_JAIL_REMOVE:
4045
4046 /*
4047 * Jail implements its own inter-process limits, so allow
4048 * root processes in jail to change scheduling on other
4049 * processes in the same jail. Likewise for signalling.
4050 */
4051 case PRIV_SCHED_DIFFCRED:
4052 case PRIV_SCHED_CPUSET:
4053 case PRIV_SCHED_DIFFJAIL:
4054 case PRIV_SIGNAL_DIFFCRED:
4055 case PRIV_SIGNAL_SUGID:
4056 case PRIV_SIGNAL_DIFFJAIL:
4057
4058 /*
4059 * Allow jailed processes to write to sysctls marked as jail
4060 * writable.
4061 */
4062 case PRIV_SYSCTL_WRITEJAIL:
4063
4064 /*
4065 * Allow root in jail to manage a variety of quota
4066 * properties. These should likely be conditional on a
4067 * configuration option.
4068 */
4069 case PRIV_VFS_GETQUOTA:
4070 case PRIV_VFS_SETQUOTA:
4071
4072 /*
4073 * Since Jail relies on chroot() to implement file system
4074 * protections, grant many VFS privileges to root in jail.
4075 * Be careful to exclude mount-related and NFS-related
4076 * privileges.
4077 */
4078 case PRIV_VFS_READ:
4079 case PRIV_VFS_WRITE:
4080 case PRIV_VFS_ADMIN:
4081 case PRIV_VFS_EXEC:
4082 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
4083 case PRIV_VFS_CHFLAGS_DEV:
4084 case PRIV_VFS_CHOWN:
4085 case PRIV_VFS_CHROOT:
4086 case PRIV_VFS_RETAINSUGID:
4087 case PRIV_VFS_FCHROOT:
4088 case PRIV_VFS_LINK:
4089 case PRIV_VFS_SETGID:
4090 case PRIV_VFS_STAT:
4091 case PRIV_VFS_STICKYFILE:
4092
4093 /*
4094 * As in the non-jail case, non-root users are expected to be
4095 * able to read kernel/physical memory (provided /dev/[k]mem
4096 * exists in the jail and they have permission to access it).
4097 */
4098 case PRIV_KMEM_READ:
4099 return (0);
4100
4101 /*
4102 * Depending on the global setting, allow privilege of
4103 * setting system flags.
4104 */
4105 case PRIV_VFS_SYSFLAGS:
4106 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
4107 return (0);
4108 else
4109 return (EPERM);
4110
4111 /*
4112 * Depending on the global setting, allow privilege of
4113 * mounting/unmounting file systems.
4114 */
4115 case PRIV_VFS_MOUNT:
4116 case PRIV_VFS_UNMOUNT:
4117 case PRIV_VFS_MOUNT_NONUSER:
4118 case PRIV_VFS_MOUNT_OWNER:
4119 pr = cred->cr_prison;
4120 prison_lock(pr);
4121 if (pr->pr_allow & PR_ALLOW_MOUNT && pr->pr_enforce_statfs < 2)
4122 error = 0;
4123 else
4124 error = EPERM;
4125 prison_unlock(pr);
4126 return (error);
4127
4128 /*
4129 * Jails should hold no disposition on the PRIV_VFS_READ_DIR
4130 * policy. priv_check_cred will not specifically allow it, and
4131 * we may want a MAC policy to allow it.
4132 */
4133 case PRIV_VFS_READ_DIR:
4134 return (0);
4135
4136 /*
4137 * Conditionally allow privileged process in the jail to
4138 * manipulate filesystem extended attributes in the system
4139 * namespace.
4140 */
4141 case PRIV_VFS_EXTATTR_SYSTEM:
4142 if ((cred->cr_prison->pr_allow & PR_ALLOW_EXTATTR) != 0)
4143 return (0);
4144 else
4145 return (EPERM);
4146
4147 /*
4148 * Conditionnaly allow locking (unlocking) physical pages
4149 * in memory.
4150 */
4151 case PRIV_VM_MLOCK:
4152 case PRIV_VM_MUNLOCK:
4153 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK)
4154 return (0);
4155 else
4156 return (EPERM);
4157
4158 /*
4159 * Conditionally allow jailed root to bind reserved ports.
4160 */
4161 case PRIV_NETINET_RESERVEDPORT:
4162 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS)
4163 return (0);
4164 else
4165 return (EPERM);
4166
4167 /*
4168 * Allow jailed root to reuse in-use ports.
4169 */
4170 case PRIV_NETINET_REUSEPORT:
4171 return (0);
4172
4173 /*
4174 * Allow jailed root to set certain IPv4/6 (option) headers.
4175 */
4176 case PRIV_NETINET_SETHDROPTS:
4177 return (0);
4178
4179 /*
4180 * Conditionally allow creating raw sockets in jail.
4181 */
4182 case PRIV_NETINET_RAW:
4183 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
4184 return (0);
4185 else
4186 return (EPERM);
4187
4188 /*
4189 * Since jail implements its own visibility limits on netstat
4190 * sysctls, allow getcred. This allows identd to work in
4191 * jail.
4192 */
4193 case PRIV_NETINET_GETCRED:
4194 return (0);
4195
4196 /*
4197 * Allow jailed root to set loginclass.
4198 */
4199 case PRIV_PROC_SETLOGINCLASS:
4200 return (0);
4201
4202 /*
4203 * Do not allow a process inside a jail to read the kernel
4204 * message buffer unless explicitly permitted.
4205 */
4206 case PRIV_MSGBUF:
4207 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF)
4208 return (0);
4209 return (EPERM);
4210
4211 /*
4212 * Conditionally allow privileged process in the jail adjust
4213 * machine time.
4214 */
4215 case PRIV_ADJTIME:
4216 case PRIV_NTP_ADJTIME:
4217 if (cred->cr_prison->pr_allow &
4218 (PR_ALLOW_ADJTIME | PR_ALLOW_SETTIME)) {
4219 return (0);
4220 }
4221 return (EPERM);
4222
4223 /*
4224 * Conditionally allow privileged process in the jail set
4225 * machine time.
4226 */
4227 case PRIV_SETTIMEOFDAY:
4228 case PRIV_CLOCK_SETTIME:
4229 if (cred->cr_prison->pr_allow & PR_ALLOW_SETTIME)
4230 return (0);
4231 else
4232 return (EPERM);
4233
4234 /*
4235 * Conditionally allow privileged process in the jail to modify
4236 * the routing table.
4237 */
4238 case PRIV_NET_ROUTE:
4239 if (cred->cr_prison->pr_allow & PR_ALLOW_ROUTING)
4240 return (0);
4241 else
4242 return (EPERM);
4243
4244 default:
4245 /*
4246 * In all remaining cases, deny the privilege request. This
4247 * includes almost all network privileges, many system
4248 * configuration privileges.
4249 */
4250 return (EPERM);
4251 }
4252 }
4253
4254 /*
4255 * Return the part of pr2's name that is relative to pr1, or the whole name
4256 * if it does not directly follow.
4257 */
4258
4259 char *
prison_name(struct prison * pr1,struct prison * pr2)4260 prison_name(struct prison *pr1, struct prison *pr2)
4261 {
4262 char *name;
4263
4264 /* Jails see themselves as "0" (if they see themselves at all). */
4265 if (pr1 == pr2)
4266 return "0";
4267 name = pr2->pr_name;
4268 if (prison_ischild(pr1, pr2)) {
4269 /*
4270 * pr1 isn't locked (and allprison_lock may not be either)
4271 * so its length can't be counted on. But the number of dots
4272 * can be counted on - and counted.
4273 */
4274 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
4275 name = strchr(name, '.') + 1;
4276 }
4277 return (name);
4278 }
4279
4280 /*
4281 * Return the part of pr2's path that is relative to pr1, or the whole path
4282 * if it does not directly follow.
4283 */
4284 static char *
prison_path(struct prison * pr1,struct prison * pr2)4285 prison_path(struct prison *pr1, struct prison *pr2)
4286 {
4287 char *path1, *path2;
4288 int len1;
4289
4290 path1 = pr1->pr_path;
4291 path2 = pr2->pr_path;
4292 if (!strcmp(path1, "/"))
4293 return (path2);
4294 len1 = strlen(path1);
4295 if (strncmp(path1, path2, len1))
4296 return (path2);
4297 if (path2[len1] == '\0')
4298 return "/";
4299 if (path2[len1] == '/')
4300 return (path2 + len1);
4301 return (path2);
4302 }
4303
4304 /*
4305 * Jail-related sysctls.
4306 */
4307 SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
4308 "Jails");
4309
4310 #if defined(INET) || defined(INET6)
4311 /*
4312 * Copy address array to memory that would be then SYSCTL_OUT-ed.
4313 * sysctl_jail_list() helper.
4314 */
4315 static void
prison_ip_copyout(struct prison * pr,const pr_family_t af,void ** out,int * len)4316 prison_ip_copyout(struct prison *pr, const pr_family_t af, void **out, int *len)
4317 {
4318 const struct prison_ip *pip;
4319 const size_t size = pr_families[af].size;
4320
4321 again:
4322 mtx_assert(&pr->pr_mtx, MA_OWNED);
4323 if ((pip = pr->pr_addrs[af]) != NULL) {
4324 if (*len < pip->ips) {
4325 *len = pip->ips;
4326 mtx_unlock(&pr->pr_mtx);
4327 *out = realloc(*out, *len * size, M_TEMP, M_WAITOK);
4328 mtx_lock(&pr->pr_mtx);
4329 goto again;
4330 }
4331 bcopy(pip->pr_ip, *out, pip->ips * size);
4332 }
4333 }
4334 #endif
4335
4336 static int
sysctl_jail_list(SYSCTL_HANDLER_ARGS)4337 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
4338 {
4339 struct xprison *xp;
4340 struct prison *pr, *cpr;
4341 #ifdef INET
4342 struct in_addr *ip4 = NULL;
4343 int ip4s = 0;
4344 #endif
4345 #ifdef INET6
4346 struct in6_addr *ip6 = NULL;
4347 int ip6s = 0;
4348 #endif
4349 int descend, error;
4350
4351 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
4352 pr = req->td->td_ucred->cr_prison;
4353 error = 0;
4354 sx_slock(&allprison_lock);
4355 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
4356 mtx_lock(&cpr->pr_mtx);
4357 #ifdef INET
4358 prison_ip_copyout(cpr, PR_INET, (void **)&ip4, &ip4s);
4359 #endif
4360 #ifdef INET6
4361 prison_ip_copyout(cpr, PR_INET6, (void **)&ip6, &ip6s);
4362 #endif
4363 bzero(xp, sizeof(*xp));
4364 xp->pr_version = XPRISON_VERSION;
4365 xp->pr_id = cpr->pr_id;
4366 xp->pr_state = cpr->pr_state;
4367 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
4368 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
4369 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
4370 #ifdef INET
4371 xp->pr_ip4s = ip4s;
4372 #endif
4373 #ifdef INET6
4374 xp->pr_ip6s = ip6s;
4375 #endif
4376 mtx_unlock(&cpr->pr_mtx);
4377 error = SYSCTL_OUT(req, xp, sizeof(*xp));
4378 if (error)
4379 break;
4380 #ifdef INET
4381 if (xp->pr_ip4s > 0) {
4382 error = SYSCTL_OUT(req, ip4,
4383 xp->pr_ip4s * sizeof(struct in_addr));
4384 if (error)
4385 break;
4386 }
4387 #endif
4388 #ifdef INET6
4389 if (xp->pr_ip6s > 0) {
4390 error = SYSCTL_OUT(req, ip6,
4391 xp->pr_ip6s * sizeof(struct in6_addr));
4392 if (error)
4393 break;
4394 }
4395 #endif
4396 }
4397 sx_sunlock(&allprison_lock);
4398 free(xp, M_TEMP);
4399 #ifdef INET
4400 free(ip4, M_TEMP);
4401 #endif
4402 #ifdef INET6
4403 free(ip6, M_TEMP);
4404 #endif
4405 return (error);
4406 }
4407
4408 SYSCTL_OID(_security_jail, OID_AUTO, list,
4409 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4410 sysctl_jail_list, "S", "List of active jails");
4411
4412 static int
sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)4413 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
4414 {
4415 int error, injail;
4416
4417 injail = jailed(req->td->td_ucred);
4418 error = SYSCTL_OUT(req, &injail, sizeof(injail));
4419
4420 return (error);
4421 }
4422
4423 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
4424 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4425 sysctl_jail_jailed, "I", "Process in jail?");
4426
4427 static int
sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)4428 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
4429 {
4430 int error, havevnet;
4431 #ifdef VIMAGE
4432 struct ucred *cred = req->td->td_ucred;
4433
4434 havevnet = jailed(cred) && prison_owns_vnet(cred->cr_prison);
4435 #else
4436 havevnet = 0;
4437 #endif
4438 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
4439
4440 return (error);
4441 }
4442
4443 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
4444 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4445 sysctl_jail_vnet, "I", "Jail owns vnet?");
4446
4447 #if defined(INET) || defined(INET6)
4448 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
4449 &jail_max_af_ips, 0,
4450 "Number of IP addresses a jail may have at most per address family (deprecated)");
4451 #endif
4452
4453 /*
4454 * Default parameters for jail(2) compatibility. For historical reasons,
4455 * the sysctl names have varying similarity to the parameter names. Prisons
4456 * just see their own parameters, and can't change them.
4457 */
4458 static int
sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)4459 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
4460 {
4461 int error, i;
4462
4463 /* Get the current flag value, and convert it to a boolean. */
4464 if (req->td->td_ucred->cr_prison == &prison0) {
4465 mtx_lock(&prison0.pr_mtx);
4466 i = (jail_default_allow & arg2) != 0;
4467 mtx_unlock(&prison0.pr_mtx);
4468 } else
4469 i = prison_allow(req->td->td_ucred, arg2);
4470
4471 if (arg1 != NULL)
4472 i = !i;
4473 error = sysctl_handle_int(oidp, &i, 0, req);
4474 if (error || !req->newptr)
4475 return (error);
4476 i = i ? arg2 : 0;
4477 if (arg1 != NULL)
4478 i ^= arg2;
4479 /*
4480 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
4481 * for writing.
4482 */
4483 mtx_lock(&prison0.pr_mtx);
4484 jail_default_allow = (jail_default_allow & ~arg2) | i;
4485 mtx_unlock(&prison0.pr_mtx);
4486 return (0);
4487 }
4488
4489 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
4490 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4491 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
4492 "Processes in jail can set their hostnames (deprecated)");
4493 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
4494 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4495 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
4496 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)");
4497 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
4498 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4499 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
4500 "Processes in jail can use System V IPC primitives (deprecated)");
4501 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
4502 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4503 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
4504 "Prison root can create raw sockets (deprecated)");
4505 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
4506 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4507 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
4508 "Processes in jail can alter system file flags (deprecated)");
4509 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
4510 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4511 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
4512 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)");
4513 SYSCTL_PROC(_security_jail, OID_AUTO, mlock_allowed,
4514 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4515 NULL, PR_ALLOW_MLOCK, sysctl_jail_default_allow, "I",
4516 "Processes in jail can lock/unlock physical pages in memory");
4517
4518 static int
sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)4519 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
4520 {
4521 struct prison *pr;
4522 int level, error;
4523
4524 pr = req->td->td_ucred->cr_prison;
4525 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
4526 error = sysctl_handle_int(oidp, &level, 0, req);
4527 if (error || !req->newptr)
4528 return (error);
4529 *(int *)arg1 = level;
4530 return (0);
4531 }
4532
4533 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
4534 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4535 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
4536 sysctl_jail_default_level, "I",
4537 "Processes in jail cannot see all mounted file systems (deprecated)");
4538
4539 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
4540 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
4541 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
4542 sysctl_jail_default_level, "I",
4543 "Ruleset for the devfs filesystem in jail (deprecated)");
4544
4545 SYSCTL_NODE(_security_jail, OID_AUTO, children, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
4546 "Limits and stats of child jails");
4547
4548 static int
sysctl_jail_children(SYSCTL_HANDLER_ARGS)4549 sysctl_jail_children(SYSCTL_HANDLER_ARGS)
4550 {
4551 struct prison *pr;
4552 int i;
4553
4554 pr = req->td->td_ucred->cr_prison;
4555
4556 switch (oidp->oid_kind & CTLTYPE) {
4557 case CTLTYPE_INT:
4558 i = *(int *)((char *)pr + arg2);
4559 return (SYSCTL_OUT(req, &i, sizeof(i)));
4560 }
4561
4562 return (0);
4563 }
4564
4565 SYSCTL_PROC(_security_jail_children, OID_AUTO, max,
4566 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
4567 NULL, offsetof(struct prison, pr_childmax), sysctl_jail_children,
4568 "I", "Maximum number of child jails");
4569 SYSCTL_PROC(_security_jail_children, OID_AUTO, cur,
4570 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
4571 NULL, offsetof(struct prison, pr_childcount), sysctl_jail_children,
4572 "I", "Current number of child jails");
4573
4574 /*
4575 * Nodes to describe jail parameters. Maximum length of string parameters
4576 * is returned in the string itself, and the other parameters exist merely
4577 * to make themselves and their types known.
4578 */
4579 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
4580 "Jail parameters");
4581
4582 int
sysctl_jail_param(SYSCTL_HANDLER_ARGS)4583 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
4584 {
4585 int i;
4586 long l;
4587 size_t s;
4588 char numbuf[12];
4589
4590 switch (oidp->oid_kind & CTLTYPE)
4591 {
4592 case CTLTYPE_LONG:
4593 case CTLTYPE_ULONG:
4594 l = 0;
4595 #ifdef SCTL_MASK32
4596 if (!(req->flags & SCTL_MASK32))
4597 #endif
4598 return (SYSCTL_OUT(req, &l, sizeof(l)));
4599 case CTLTYPE_INT:
4600 case CTLTYPE_UINT:
4601 i = 0;
4602 return (SYSCTL_OUT(req, &i, sizeof(i)));
4603 case CTLTYPE_STRING:
4604 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
4605 return
4606 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
4607 case CTLTYPE_STRUCT:
4608 s = (size_t)arg2;
4609 return (SYSCTL_OUT(req, &s, sizeof(s)));
4610 }
4611 return (0);
4612 }
4613
4614 /*
4615 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at
4616 * jail creation time but cannot be changed in an existing jail.
4617 */
4618 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
4619 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
4620 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
4621 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
4622 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
4623 "I", "Jail secure level");
4624 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I",
4625 "Jail value for kern.osreldate and uname -K");
4626 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN,
4627 "Jail value for kern.osrelease and uname -r");
4628 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
4629 "I", "Jail cannot see all mounted file systems");
4630 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
4631 "I", "Ruleset for in-jail devfs mounts");
4632 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
4633 "B", "Jail persistence");
4634 #ifdef VIMAGE
4635 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
4636 "E,jailsys", "Virtual network stack");
4637 #endif
4638 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
4639 "B", "Jail is in the process of shutting down");
4640
4641 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
4642 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
4643 "I", "Current number of child jails");
4644 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
4645 "I", "Maximum number of child jails");
4646
4647 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
4648 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
4649 "Jail hostname");
4650 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
4651 "Jail NIS domainname");
4652 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
4653 "Jail host UUID");
4654 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
4655 "LU", "Jail host ID");
4656
4657 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
4658 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
4659
4660 #ifdef INET
4661 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
4662 "Jail IPv4 address virtualization");
4663 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
4664 "S,in_addr,a", "Jail IPv4 addresses");
4665 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4666 "B", "Do (not) use IPv4 source address selection rather than the "
4667 "primary jail IPv4 address.");
4668 #endif
4669 #ifdef INET6
4670 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
4671 "Jail IPv6 address virtualization");
4672 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
4673 "S,in6_addr,a", "Jail IPv6 addresses");
4674 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4675 "B", "Do (not) use IPv6 source address selection rather than the "
4676 "primary jail IPv6 address.");
4677 #endif
4678
4679 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
4680 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
4681 "B", "Jail may set hostname");
4682 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
4683 "B", "Jail may use SYSV IPC");
4684 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
4685 "B", "Jail may create raw sockets");
4686 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
4687 "B", "Jail may alter system file flags");
4688 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
4689 "B", "Jail may set file quotas");
4690 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
4691 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
4692 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW,
4693 "B", "Jail may lock (unlock) physical pages in memory");
4694 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW,
4695 "B", "Jail may bind sockets to reserved ports");
4696 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW,
4697 "B", "Jail may read the kernel message buffer");
4698 SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW,
4699 "B", "Unprivileged processes may use process debugging facilities");
4700 SYSCTL_JAIL_PARAM(_allow, unprivileged_parent_tampering,
4701 CTLTYPE_INT | CTLFLAG_RW, "B",
4702 "Unprivileged parent jail processes may tamper with same-uid processes"
4703 " (signal/debug/cpuset)");
4704 SYSCTL_JAIL_PARAM(_allow, suser, CTLTYPE_INT | CTLFLAG_RW,
4705 "B", "Processes in jail with uid 0 have privilege");
4706 #ifdef VIMAGE
4707 SYSCTL_JAIL_PARAM(_allow, nfsd, CTLTYPE_INT | CTLFLAG_RW,
4708 "B", "Mountd/nfsd may run in the jail");
4709 #endif
4710 SYSCTL_JAIL_PARAM(_allow, extattr, CTLTYPE_INT | CTLFLAG_RW,
4711 "B", "Jail may set system-level filesystem extended attributes");
4712 SYSCTL_JAIL_PARAM(_allow, adjtime, CTLTYPE_INT | CTLFLAG_RW,
4713 "B", "Jail may adjust system time");
4714 SYSCTL_JAIL_PARAM(_allow, settime, CTLTYPE_INT | CTLFLAG_RW,
4715 "B", "Jail may set system time");
4716 SYSCTL_JAIL_PARAM(_allow, routing, CTLTYPE_INT | CTLFLAG_RW,
4717 "B", "Jail may modify routing table");
4718
4719 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
4720 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
4721 "B", "Jail may mount/unmount jail-friendly file systems in general");
4722
4723 /*
4724 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return
4725 * its associated bit in the pr_allow bitmask, or zero if the parameter was
4726 * not created.
4727 */
4728 unsigned
prison_add_allow(const char * prefix,const char * name,const char * prefix_descr,const char * descr)4729 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr,
4730 const char *descr)
4731 {
4732 struct bool_flags *bf;
4733 struct sysctl_oid *parent;
4734 char *allow_name, *allow_noname, *allowed;
4735 #ifndef NO_SYSCTL_DESCR
4736 char *descr_deprecated;
4737 #endif
4738 u_int allow_flag;
4739
4740 if (prefix
4741 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name)
4742 < 0 ||
4743 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name)
4744 < 0
4745 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 ||
4746 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) {
4747 free(allow_name, M_PRISON);
4748 return 0;
4749 }
4750
4751 /*
4752 * See if this parameter has already beed added, i.e. a module was
4753 * previously loaded/unloaded.
4754 */
4755 mtx_lock(&prison0.pr_mtx);
4756 for (bf = pr_flag_allow;
4757 bf < pr_flag_allow + nitems(pr_flag_allow) &&
4758 atomic_load_int(&bf->flag) != 0;
4759 bf++) {
4760 if (strcmp(bf->name, allow_name) == 0) {
4761 allow_flag = bf->flag;
4762 goto no_add;
4763 }
4764 }
4765
4766 /*
4767 * Find a free bit in pr_allow_all, failing if there are none
4768 * (which shouldn't happen as long as we keep track of how many
4769 * potential dynamic flags exist).
4770 */
4771 for (allow_flag = 1;; allow_flag <<= 1) {
4772 if (allow_flag == 0)
4773 goto no_add;
4774 if ((pr_allow_all & allow_flag) == 0)
4775 break;
4776 }
4777
4778 /* Note the parameter in the next open slot in pr_flag_allow. */
4779 for (bf = pr_flag_allow; ; bf++) {
4780 if (bf == pr_flag_allow + nitems(pr_flag_allow)) {
4781 /* This should never happen, but is not fatal. */
4782 allow_flag = 0;
4783 goto no_add;
4784 }
4785 if (atomic_load_int(&bf->flag) == 0)
4786 break;
4787 }
4788 bf->name = allow_name;
4789 bf->noname = allow_noname;
4790 pr_allow_all |= allow_flag;
4791 /*
4792 * prison0 always has permission for the new parameter.
4793 * Other jails must have it granted to them.
4794 */
4795 prison0.pr_allow |= allow_flag;
4796 /* The flag indicates a valid entry, so make sure it is set last. */
4797 atomic_store_rel_int(&bf->flag, allow_flag);
4798 mtx_unlock(&prison0.pr_mtx);
4799
4800 /*
4801 * Create sysctls for the parameter, and the back-compat global
4802 * permission.
4803 */
4804 parent = prefix
4805 ? SYSCTL_ADD_NODE(NULL,
4806 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow),
4807 OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr)
4808 : &sysctl___security_jail_param_allow;
4809 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO,
4810 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4811 NULL, 0, sysctl_jail_param, "B", descr);
4812 if ((prefix
4813 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name)
4814 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) {
4815 #ifndef NO_SYSCTL_DESCR
4816 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)",
4817 descr);
4818 #endif
4819 (void)SYSCTL_ADD_PROC(NULL,
4820 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed,
4821 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag,
4822 sysctl_jail_default_allow, "I", descr_deprecated);
4823 #ifndef NO_SYSCTL_DESCR
4824 free(descr_deprecated, M_TEMP);
4825 #endif
4826 free(allowed, M_TEMP);
4827 }
4828 return allow_flag;
4829
4830 no_add:
4831 mtx_unlock(&prison0.pr_mtx);
4832 free(allow_name, M_PRISON);
4833 free(allow_noname, M_PRISON);
4834 return allow_flag;
4835 }
4836
4837 /*
4838 * The VFS system will register jail-aware filesystems here. They each get
4839 * a parameter allow.mount.xxxfs and a flag to check when a jailed user
4840 * attempts to mount.
4841 */
4842 void
prison_add_vfs(struct vfsconf * vfsp)4843 prison_add_vfs(struct vfsconf *vfsp)
4844 {
4845 #ifdef NO_SYSCTL_DESCR
4846
4847 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
4848 NULL, NULL);
4849 #else
4850 char *descr;
4851
4852 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system",
4853 vfsp->vfc_name);
4854 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
4855 NULL, descr);
4856 free(descr, M_TEMP);
4857 #endif
4858 }
4859
4860 #ifdef RACCT
4861 void
prison_racct_foreach(void (* callback)(struct racct * racct,void * arg2,void * arg3),void (* pre)(void),void (* post)(void),void * arg2,void * arg3)4862 prison_racct_foreach(void (*callback)(struct racct *racct,
4863 void *arg2, void *arg3), void (*pre)(void), void (*post)(void),
4864 void *arg2, void *arg3)
4865 {
4866 struct prison_racct *prr;
4867
4868 ASSERT_RACCT_ENABLED();
4869
4870 sx_slock(&allprison_lock);
4871 if (pre != NULL)
4872 (pre)();
4873 LIST_FOREACH(prr, &allprison_racct, prr_next)
4874 (callback)(prr->prr_racct, arg2, arg3);
4875 if (post != NULL)
4876 (post)();
4877 sx_sunlock(&allprison_lock);
4878 }
4879
4880 static struct prison_racct *
prison_racct_find_locked(const char * name)4881 prison_racct_find_locked(const char *name)
4882 {
4883 struct prison_racct *prr;
4884
4885 ASSERT_RACCT_ENABLED();
4886 sx_assert(&allprison_lock, SA_XLOCKED);
4887
4888 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
4889 return (NULL);
4890
4891 LIST_FOREACH(prr, &allprison_racct, prr_next) {
4892 if (strcmp(name, prr->prr_name) != 0)
4893 continue;
4894
4895 /* Found prison_racct with a matching name? */
4896 prison_racct_hold(prr);
4897 return (prr);
4898 }
4899
4900 /* Add new prison_racct. */
4901 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
4902 racct_create(&prr->prr_racct);
4903
4904 strcpy(prr->prr_name, name);
4905 refcount_init(&prr->prr_refcount, 1);
4906 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
4907
4908 return (prr);
4909 }
4910
4911 struct prison_racct *
prison_racct_find(const char * name)4912 prison_racct_find(const char *name)
4913 {
4914 struct prison_racct *prr;
4915
4916 ASSERT_RACCT_ENABLED();
4917
4918 sx_xlock(&allprison_lock);
4919 prr = prison_racct_find_locked(name);
4920 sx_xunlock(&allprison_lock);
4921 return (prr);
4922 }
4923
4924 void
prison_racct_hold(struct prison_racct * prr)4925 prison_racct_hold(struct prison_racct *prr)
4926 {
4927
4928 ASSERT_RACCT_ENABLED();
4929
4930 refcount_acquire(&prr->prr_refcount);
4931 }
4932
4933 static void
prison_racct_free_locked(struct prison_racct * prr)4934 prison_racct_free_locked(struct prison_racct *prr)
4935 {
4936
4937 ASSERT_RACCT_ENABLED();
4938 sx_assert(&allprison_lock, SA_XLOCKED);
4939
4940 if (refcount_release(&prr->prr_refcount)) {
4941 racct_destroy(&prr->prr_racct);
4942 LIST_REMOVE(prr, prr_next);
4943 free(prr, M_PRISON_RACCT);
4944 }
4945 }
4946
4947 void
prison_racct_free(struct prison_racct * prr)4948 prison_racct_free(struct prison_racct *prr)
4949 {
4950
4951 ASSERT_RACCT_ENABLED();
4952 sx_assert(&allprison_lock, SA_UNLOCKED);
4953
4954 if (refcount_release_if_not_last(&prr->prr_refcount))
4955 return;
4956
4957 sx_xlock(&allprison_lock);
4958 prison_racct_free_locked(prr);
4959 sx_xunlock(&allprison_lock);
4960 }
4961
4962 static void
prison_racct_attach(struct prison * pr)4963 prison_racct_attach(struct prison *pr)
4964 {
4965 struct prison_racct *prr;
4966
4967 ASSERT_RACCT_ENABLED();
4968 sx_assert(&allprison_lock, SA_XLOCKED);
4969
4970 prr = prison_racct_find_locked(pr->pr_name);
4971 KASSERT(prr != NULL, ("cannot find prison_racct"));
4972
4973 pr->pr_prison_racct = prr;
4974 }
4975
4976 /*
4977 * Handle jail renaming. From the racct point of view, renaming means
4978 * moving from one prison_racct to another.
4979 */
4980 static void
prison_racct_modify(struct prison * pr)4981 prison_racct_modify(struct prison *pr)
4982 {
4983 #ifdef RCTL
4984 struct proc *p;
4985 struct ucred *cred;
4986 #endif
4987 struct prison_racct *oldprr;
4988
4989 ASSERT_RACCT_ENABLED();
4990
4991 sx_slock(&allproc_lock);
4992 sx_xlock(&allprison_lock);
4993
4994 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
4995 sx_xunlock(&allprison_lock);
4996 sx_sunlock(&allproc_lock);
4997 return;
4998 }
4999
5000 oldprr = pr->pr_prison_racct;
5001 pr->pr_prison_racct = NULL;
5002
5003 prison_racct_attach(pr);
5004
5005 /*
5006 * Move resource utilisation records.
5007 */
5008 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
5009
5010 #ifdef RCTL
5011 /*
5012 * Force rctl to reattach rules to processes.
5013 */
5014 FOREACH_PROC_IN_SYSTEM(p) {
5015 PROC_LOCK(p);
5016 cred = crhold(p->p_ucred);
5017 PROC_UNLOCK(p);
5018 rctl_proc_ucred_changed(p, cred);
5019 crfree(cred);
5020 }
5021 #endif
5022
5023 sx_sunlock(&allproc_lock);
5024 prison_racct_free_locked(oldprr);
5025 sx_xunlock(&allprison_lock);
5026 }
5027
5028 static void
prison_racct_detach(struct prison * pr)5029 prison_racct_detach(struct prison *pr)
5030 {
5031
5032 ASSERT_RACCT_ENABLED();
5033 sx_assert(&allprison_lock, SA_UNLOCKED);
5034
5035 if (pr->pr_prison_racct == NULL)
5036 return;
5037 prison_racct_free(pr->pr_prison_racct);
5038 pr->pr_prison_racct = NULL;
5039 }
5040 #endif /* RACCT */
5041
5042 #ifdef DDB
5043
5044 static void
db_show_prison(struct prison * pr)5045 db_show_prison(struct prison *pr)
5046 {
5047 struct bool_flags *bf;
5048 struct jailsys_flags *jsf;
5049 #if defined(INET) || defined(INET6)
5050 int ii;
5051 struct prison_ip *pip;
5052 #endif
5053 unsigned f;
5054 #ifdef INET
5055 char ip4buf[INET_ADDRSTRLEN];
5056 #endif
5057 #ifdef INET6
5058 char ip6buf[INET6_ADDRSTRLEN];
5059 #endif
5060
5061 db_printf("prison %p:\n", pr);
5062 db_printf(" jid = %d\n", pr->pr_id);
5063 db_printf(" name = %s\n", pr->pr_name);
5064 db_printf(" parent = %p\n", pr->pr_parent);
5065 db_printf(" ref = %d\n", pr->pr_ref);
5066 db_printf(" uref = %d\n", pr->pr_uref);
5067 db_printf(" state = %s\n",
5068 pr->pr_state == PRISON_STATE_ALIVE ? "alive" :
5069 pr->pr_state == PRISON_STATE_DYING ? "dying" :
5070 "invalid");
5071 db_printf(" path = %s\n", pr->pr_path);
5072 db_printf(" cpuset = %d\n", pr->pr_cpuset
5073 ? pr->pr_cpuset->cs_id : -1);
5074 #ifdef VIMAGE
5075 db_printf(" vnet = %p\n", pr->pr_vnet);
5076 #endif
5077 db_printf(" root = %p\n", pr->pr_root);
5078 db_printf(" securelevel = %d\n", pr->pr_securelevel);
5079 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
5080 db_printf(" children.max = %d\n", pr->pr_childmax);
5081 db_printf(" children.cur = %d\n", pr->pr_childcount);
5082 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
5083 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
5084 db_printf(" flags = 0x%x", pr->pr_flags);
5085 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++)
5086 if (pr->pr_flags & bf->flag)
5087 db_printf(" %s", bf->name);
5088 for (jsf = pr_flag_jailsys;
5089 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
5090 jsf++) {
5091 f = pr->pr_flags & (jsf->disable | jsf->new);
5092 db_printf(" %-16s= %s\n", jsf->name,
5093 (f != 0 && f == jsf->disable) ? "disable"
5094 : (f == jsf->new) ? "new"
5095 : "inherit");
5096 }
5097 db_printf(" allow = 0x%x", pr->pr_allow);
5098 for (bf = pr_flag_allow;
5099 bf < pr_flag_allow + nitems(pr_flag_allow) &&
5100 atomic_load_int(&bf->flag) != 0;
5101 bf++)
5102 if (pr->pr_allow & bf->flag)
5103 db_printf(" %s", bf->name);
5104 db_printf("\n");
5105 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
5106 db_printf(" host.hostname = %s\n", pr->pr_hostname);
5107 db_printf(" host.domainname = %s\n", pr->pr_domainname);
5108 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
5109 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
5110 #ifdef INET
5111 if ((pip = pr->pr_addrs[PR_INET]) != NULL) {
5112 db_printf(" ip4s = %d\n", pip->ips);
5113 for (ii = 0; ii < pip->ips; ii++)
5114 db_printf(" %s %s\n",
5115 ii == 0 ? "ip4.addr =" : " ",
5116 inet_ntoa_r(
5117 *(const struct in_addr *)PR_IP(pip, PR_INET, ii),
5118 ip4buf));
5119 }
5120 #endif
5121 #ifdef INET6
5122 if ((pip = pr->pr_addrs[PR_INET6]) != NULL) {
5123 db_printf(" ip6s = %d\n", pip->ips);
5124 for (ii = 0; ii < pip->ips; ii++)
5125 db_printf(" %s %s\n",
5126 ii == 0 ? "ip6.addr =" : " ",
5127 ip6_sprintf(ip6buf,
5128 (const struct in6_addr *)PR_IP(pip, PR_INET6, ii)));
5129 }
5130 #endif
5131 }
5132
DB_SHOW_COMMAND(prison,db_show_prison_command)5133 DB_SHOW_COMMAND(prison, db_show_prison_command)
5134 {
5135 struct prison *pr;
5136
5137 if (!have_addr) {
5138 /*
5139 * Show all prisons in the list, and prison0 which is not
5140 * listed.
5141 */
5142 db_show_prison(&prison0);
5143 if (!db_pager_quit) {
5144 TAILQ_FOREACH(pr, &allprison, pr_list) {
5145 db_show_prison(pr);
5146 if (db_pager_quit)
5147 break;
5148 }
5149 }
5150 return;
5151 }
5152
5153 if (addr == 0)
5154 pr = &prison0;
5155 else {
5156 /* Look for a prison with the ID and with references. */
5157 TAILQ_FOREACH(pr, &allprison, pr_list)
5158 if (pr->pr_id == addr && pr->pr_ref > 0)
5159 break;
5160 if (pr == NULL)
5161 /* Look again, without requiring a reference. */
5162 TAILQ_FOREACH(pr, &allprison, pr_list)
5163 if (pr->pr_id == addr)
5164 break;
5165 if (pr == NULL)
5166 /* Assume address points to a valid prison. */
5167 pr = (struct prison *)addr;
5168 }
5169 db_show_prison(pr);
5170 }
5171
5172 #endif /* DDB */
5173