1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 __FBSDID("$FreeBSD$");
33
34 #include "opt_ddb.h"
35 #include "opt_inet.h"
36 #include "opt_inet6.h"
37
38 #include <sys/param.h>
39 #include <sys/types.h>
40 #include <sys/kernel.h>
41 #include <sys/systm.h>
42 #include <sys/errno.h>
43 #include <sys/sysproto.h>
44 #include <sys/malloc.h>
45 #include <sys/osd.h>
46 #include <sys/priv.h>
47 #include <sys/proc.h>
48 #include <sys/taskqueue.h>
49 #include <sys/fcntl.h>
50 #include <sys/jail.h>
51 #include <sys/lock.h>
52 #include <sys/mutex.h>
53 #include <sys/racct.h>
54 #include <sys/rctl.h>
55 #include <sys/refcount.h>
56 #include <sys/sx.h>
57 #include <sys/sysent.h>
58 #include <sys/namei.h>
59 #include <sys/mount.h>
60 #include <sys/queue.h>
61 #include <sys/socket.h>
62 #include <sys/syscallsubr.h>
63 #include <sys/sysctl.h>
64 #include <sys/vnode.h>
65
66 #include <net/if.h>
67 #include <net/vnet.h>
68
69 #include <netinet/in.h>
70
71 #ifdef DDB
72 #include <ddb/ddb.h>
73 #endif /* DDB */
74
75 #include <security/mac/mac_framework.h>
76
77 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000"
78
79 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
80 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures");
81
82 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */
83 #ifdef INET
84 #ifdef INET6
85 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
86 #else
87 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
88 #endif
89 #else /* !INET */
90 #ifdef INET6
91 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
92 #else
93 #define _PR_IP_SADDRSEL 0
94 #endif
95 #endif
96
97 /* prison0 describes what is "real" about the system. */
98 struct prison prison0 = {
99 .pr_id = 0,
100 .pr_name = "0",
101 .pr_ref = 1,
102 .pr_uref = 1,
103 .pr_path = "/",
104 .pr_securelevel = -1,
105 .pr_devfs_rsnum = 0,
106 .pr_childmax = JAIL_MAX,
107 .pr_hostuuid = DEFAULT_HOSTUUID,
108 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
109 #ifdef VIMAGE
110 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
111 #else
112 .pr_flags = PR_HOST|_PR_IP_SADDRSEL,
113 #endif
114 .pr_allow = PR_ALLOW_ALL_STATIC,
115 };
116 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
117
118 struct bool_flags {
119 const char *name;
120 const char *noname;
121 unsigned flag;
122 };
123 struct jailsys_flags {
124 const char *name;
125 unsigned disable;
126 unsigned new;
127 };
128
129 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */
130 struct sx allprison_lock;
131 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
132 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
133 LIST_HEAD(, prison_racct) allprison_racct;
134 int lastprid = 0;
135
136 static int do_jail_attach(struct thread *td, struct prison *pr);
137 static void prison_complete(void *context, int pending);
138 static void prison_deref(struct prison *pr, int flags);
139 static char *prison_path(struct prison *pr1, struct prison *pr2);
140 static void prison_remove_one(struct prison *pr);
141 #ifdef RACCT
142 static void prison_racct_attach(struct prison *pr);
143 static void prison_racct_modify(struct prison *pr);
144 static void prison_racct_detach(struct prison *pr);
145 #endif
146
147 /* Flags for prison_deref */
148 #define PD_DEREF 0x01
149 #define PD_DEUREF 0x02
150 #define PD_LOCKED 0x04
151 #define PD_LIST_SLOCKED 0x08
152 #define PD_LIST_XLOCKED 0x10
153
154 /*
155 * Parameter names corresponding to PR_* flag values. Size values are for kvm
156 * as we cannot figure out the size of a sparse array, or an array without a
157 * terminating entry.
158 */
159 static struct bool_flags pr_flag_bool[] = {
160 {"persist", "nopersist", PR_PERSIST},
161 #ifdef INET
162 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL},
163 #endif
164 #ifdef INET6
165 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL},
166 #endif
167 };
168 const size_t pr_flag_bool_size = sizeof(pr_flag_bool);
169
170 static struct jailsys_flags pr_flag_jailsys[] = {
171 {"host", 0, PR_HOST},
172 #ifdef VIMAGE
173 {"vnet", 0, PR_VNET},
174 #endif
175 #ifdef INET
176 {"ip4", PR_IP4_USER, PR_IP4_USER},
177 #endif
178 #ifdef INET6
179 {"ip6", PR_IP6_USER, PR_IP6_USER},
180 #endif
181 };
182 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
183
184 /* Make this array full-size so dynamic parameters can be added. */
185 static struct bool_flags pr_flag_allow[NBBY * NBPW] = {
186 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME},
187 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC},
188 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS},
189 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS},
190 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT},
191 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS},
192 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF},
193 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK},
194 {"allow.reserved_ports", "allow.noreserved_ports",
195 PR_ALLOW_RESERVED_PORTS},
196 {"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF},
197 };
198 const size_t pr_flag_allow_size = sizeof(pr_flag_allow);
199
200 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | PR_ALLOW_RESERVED_PORTS)
201 #define JAIL_DEFAULT_ENFORCE_STATFS 2
202 #define JAIL_DEFAULT_DEVFS_RSNUM 0
203 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
204 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
205 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
206 #if defined(INET) || defined(INET6)
207 static unsigned jail_max_af_ips = 255;
208 #endif
209
210 /*
211 * Initialize the parts of prison0 that can't be static-initialized with
212 * constants. This is called from proc0_init() after creating thread0 cpuset.
213 */
214 void
prison0_init(void)215 prison0_init(void)
216 {
217
218 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset);
219 prison0.pr_osreldate = osreldate;
220 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease));
221 }
222
223 /*
224 * struct jail_args {
225 * struct jail *jail;
226 * };
227 */
228 int
sys_jail(struct thread * td,struct jail_args * uap)229 sys_jail(struct thread *td, struct jail_args *uap)
230 {
231 uint32_t version;
232 int error;
233 struct jail j;
234
235 error = copyin(uap->jail, &version, sizeof(uint32_t));
236 if (error)
237 return (error);
238
239 switch (version) {
240 case 0:
241 {
242 struct jail_v0 j0;
243
244 /* FreeBSD single IPv4 jails. */
245 bzero(&j, sizeof(struct jail));
246 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
247 if (error)
248 return (error);
249 j.version = j0.version;
250 j.path = j0.path;
251 j.hostname = j0.hostname;
252 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */
253 break;
254 }
255
256 case 1:
257 /*
258 * Version 1 was used by multi-IPv4 jail implementations
259 * that never made it into the official kernel.
260 */
261 return (EINVAL);
262
263 case 2: /* JAIL_API_VERSION */
264 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
265 error = copyin(uap->jail, &j, sizeof(struct jail));
266 if (error)
267 return (error);
268 break;
269
270 default:
271 /* Sci-Fi jails are not supported, sorry. */
272 return (EINVAL);
273 }
274 return (kern_jail(td, &j));
275 }
276
277 int
kern_jail(struct thread * td,struct jail * j)278 kern_jail(struct thread *td, struct jail *j)
279 {
280 struct iovec optiov[2 * (4 + nitems(pr_flag_allow)
281 #ifdef INET
282 + 1
283 #endif
284 #ifdef INET6
285 + 1
286 #endif
287 )];
288 struct uio opt;
289 char *u_path, *u_hostname, *u_name;
290 struct bool_flags *bf;
291 #ifdef INET
292 uint32_t ip4s;
293 struct in_addr *u_ip4;
294 #endif
295 #ifdef INET6
296 struct in6_addr *u_ip6;
297 #endif
298 size_t tmplen;
299 int error, enforce_statfs;
300
301 bzero(&optiov, sizeof(optiov));
302 opt.uio_iov = optiov;
303 opt.uio_iovcnt = 0;
304 opt.uio_offset = -1;
305 opt.uio_resid = -1;
306 opt.uio_segflg = UIO_SYSSPACE;
307 opt.uio_rw = UIO_READ;
308 opt.uio_td = td;
309
310 /* Set permissions for top-level jails from sysctls. */
311 if (!jailed(td->td_ucred)) {
312 for (bf = pr_flag_allow;
313 bf < pr_flag_allow + nitems(pr_flag_allow) &&
314 bf->flag != 0;
315 bf++) {
316 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *,
317 (jail_default_allow & bf->flag)
318 ? bf->name : bf->noname);
319 optiov[opt.uio_iovcnt].iov_len =
320 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
321 opt.uio_iovcnt += 2;
322 }
323 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
324 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
325 opt.uio_iovcnt++;
326 enforce_statfs = jail_default_enforce_statfs;
327 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
328 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
329 opt.uio_iovcnt++;
330 }
331
332 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
333 #ifdef INET
334 ip4s = (j->version == 0) ? 1 : j->ip4s;
335 if (ip4s > jail_max_af_ips)
336 return (EINVAL);
337 tmplen += ip4s * sizeof(struct in_addr);
338 #else
339 if (j->ip4s > 0)
340 return (EINVAL);
341 #endif
342 #ifdef INET6
343 if (j->ip6s > jail_max_af_ips)
344 return (EINVAL);
345 tmplen += j->ip6s * sizeof(struct in6_addr);
346 #else
347 if (j->ip6s > 0)
348 return (EINVAL);
349 #endif
350 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
351 u_hostname = u_path + MAXPATHLEN;
352 u_name = u_hostname + MAXHOSTNAMELEN;
353 #ifdef INET
354 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
355 #endif
356 #ifdef INET6
357 #ifdef INET
358 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
359 #else
360 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
361 #endif
362 #endif
363 optiov[opt.uio_iovcnt].iov_base = "path";
364 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
365 opt.uio_iovcnt++;
366 optiov[opt.uio_iovcnt].iov_base = u_path;
367 error = copyinstr(j->path, u_path, MAXPATHLEN,
368 &optiov[opt.uio_iovcnt].iov_len);
369 if (error) {
370 free(u_path, M_TEMP);
371 return (error);
372 }
373 opt.uio_iovcnt++;
374 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
375 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
376 opt.uio_iovcnt++;
377 optiov[opt.uio_iovcnt].iov_base = u_hostname;
378 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
379 &optiov[opt.uio_iovcnt].iov_len);
380 if (error) {
381 free(u_path, M_TEMP);
382 return (error);
383 }
384 opt.uio_iovcnt++;
385 if (j->jailname != NULL) {
386 optiov[opt.uio_iovcnt].iov_base = "name";
387 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
388 opt.uio_iovcnt++;
389 optiov[opt.uio_iovcnt].iov_base = u_name;
390 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
391 &optiov[opt.uio_iovcnt].iov_len);
392 if (error) {
393 free(u_path, M_TEMP);
394 return (error);
395 }
396 opt.uio_iovcnt++;
397 }
398 #ifdef INET
399 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
400 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
401 opt.uio_iovcnt++;
402 optiov[opt.uio_iovcnt].iov_base = u_ip4;
403 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
404 if (j->version == 0)
405 u_ip4->s_addr = j->ip4s;
406 else {
407 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
408 if (error) {
409 free(u_path, M_TEMP);
410 return (error);
411 }
412 }
413 opt.uio_iovcnt++;
414 #endif
415 #ifdef INET6
416 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
417 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
418 opt.uio_iovcnt++;
419 optiov[opt.uio_iovcnt].iov_base = u_ip6;
420 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
421 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
422 if (error) {
423 free(u_path, M_TEMP);
424 return (error);
425 }
426 opt.uio_iovcnt++;
427 #endif
428 KASSERT(opt.uio_iovcnt <= nitems(optiov),
429 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
430 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
431 free(u_path, M_TEMP);
432 return (error);
433 }
434
435
436 /*
437 * struct jail_set_args {
438 * struct iovec *iovp;
439 * unsigned int iovcnt;
440 * int flags;
441 * };
442 */
443 int
sys_jail_set(struct thread * td,struct jail_set_args * uap)444 sys_jail_set(struct thread *td, struct jail_set_args *uap)
445 {
446 struct uio *auio;
447 int error;
448
449 /* Check that we have an even number of iovecs. */
450 if (uap->iovcnt & 1)
451 return (EINVAL);
452
453 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
454 if (error)
455 return (error);
456 error = kern_jail_set(td, auio, uap->flags);
457 free(auio, M_IOV);
458 return (error);
459 }
460
461 int
kern_jail_set(struct thread * td,struct uio * optuio,int flags)462 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
463 {
464 struct nameidata nd;
465 #ifdef INET
466 struct in_addr *ip4;
467 #endif
468 #ifdef INET6
469 struct in6_addr *ip6;
470 #endif
471 struct vfsopt *opt;
472 struct vfsoptlist *opts;
473 struct prison *pr, *deadpr, *mypr, *ppr, *tpr;
474 struct vnode *root;
475 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
476 char *g_path, *osrelstr;
477 struct bool_flags *bf;
478 struct jailsys_flags *jsf;
479 #if defined(INET) || defined(INET6)
480 struct prison *tppr;
481 void *op;
482 #endif
483 unsigned long hid;
484 size_t namelen, onamelen, pnamelen;
485 int born, created, cuflags, descend, enforce;
486 int error, errmsg_len, errmsg_pos;
487 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
488 int jid, jsys, len, level;
489 int childmax, osreldt, rsnum, slevel;
490 int fullpath_disabled;
491 #if defined(INET) || defined(INET6)
492 int ii, ij;
493 #endif
494 #ifdef INET
495 int ip4s, redo_ip4;
496 #endif
497 #ifdef INET6
498 int ip6s, redo_ip6;
499 #endif
500 uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
501 unsigned tallow;
502 char numbuf[12];
503
504 error = priv_check(td, PRIV_JAIL_SET);
505 if (!error && (flags & JAIL_ATTACH))
506 error = priv_check(td, PRIV_JAIL_ATTACH);
507 if (error)
508 return (error);
509 mypr = td->td_ucred->cr_prison;
510 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
511 return (EPERM);
512 if (flags & ~JAIL_SET_MASK)
513 return (EINVAL);
514
515 /*
516 * Check all the parameters before committing to anything. Not all
517 * errors can be caught early, but we may as well try. Also, this
518 * takes care of some expensive stuff (path lookup) before getting
519 * the allprison lock.
520 *
521 * XXX Jails are not filesystems, and jail parameters are not mount
522 * options. But it makes more sense to re-use the vfsopt code
523 * than duplicate it under a different name.
524 */
525 error = vfs_buildopts(optuio, &opts);
526 if (error)
527 return (error);
528 #ifdef INET
529 ip4 = NULL;
530 #endif
531 #ifdef INET6
532 ip6 = NULL;
533 #endif
534 g_path = NULL;
535
536 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
537 if (!cuflags) {
538 error = EINVAL;
539 vfs_opterror(opts, "no valid operation (create or update)");
540 goto done_errmsg;
541 }
542
543 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
544 if (error == ENOENT)
545 jid = 0;
546 else if (error != 0)
547 goto done_free;
548
549 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
550 if (error == ENOENT)
551 gotslevel = 0;
552 else if (error != 0)
553 goto done_free;
554 else
555 gotslevel = 1;
556
557 error =
558 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
559 if (error == ENOENT)
560 gotchildmax = 0;
561 else if (error != 0)
562 goto done_free;
563 else
564 gotchildmax = 1;
565
566 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
567 if (error == ENOENT)
568 gotenforce = 0;
569 else if (error != 0)
570 goto done_free;
571 else if (enforce < 0 || enforce > 2) {
572 error = EINVAL;
573 goto done_free;
574 } else
575 gotenforce = 1;
576
577 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
578 if (error == ENOENT)
579 gotrsnum = 0;
580 else if (error != 0)
581 goto done_free;
582 else
583 gotrsnum = 1;
584
585 pr_flags = ch_flags = 0;
586 for (bf = pr_flag_bool;
587 bf < pr_flag_bool + nitems(pr_flag_bool);
588 bf++) {
589 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag);
590 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag);
591 }
592 ch_flags |= pr_flags;
593 for (jsf = pr_flag_jailsys;
594 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
595 jsf++) {
596 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys));
597 if (error == ENOENT)
598 continue;
599 if (error != 0)
600 goto done_free;
601 switch (jsys) {
602 case JAIL_SYS_DISABLE:
603 if (!jsf->disable) {
604 error = EINVAL;
605 goto done_free;
606 }
607 pr_flags |= jsf->disable;
608 break;
609 case JAIL_SYS_NEW:
610 pr_flags |= jsf->new;
611 break;
612 case JAIL_SYS_INHERIT:
613 break;
614 default:
615 error = EINVAL;
616 goto done_free;
617 }
618 ch_flags |= jsf->new | jsf->disable;
619 }
620 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE
621 && !(pr_flags & PR_PERSIST)) {
622 error = EINVAL;
623 vfs_opterror(opts, "new jail must persist or attach");
624 goto done_errmsg;
625 }
626 #ifdef VIMAGE
627 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
628 error = EINVAL;
629 vfs_opterror(opts, "vnet cannot be changed after creation");
630 goto done_errmsg;
631 }
632 #endif
633 #ifdef INET
634 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
635 error = EINVAL;
636 vfs_opterror(opts, "ip4 cannot be changed after creation");
637 goto done_errmsg;
638 }
639 #endif
640 #ifdef INET6
641 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
642 error = EINVAL;
643 vfs_opterror(opts, "ip6 cannot be changed after creation");
644 goto done_errmsg;
645 }
646 #endif
647
648 pr_allow = ch_allow = 0;
649 for (bf = pr_flag_allow;
650 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0;
651 bf++) {
652 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag);
653 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag);
654 }
655 ch_allow |= pr_allow;
656
657 error = vfs_getopt(opts, "name", (void **)&name, &len);
658 if (error == ENOENT)
659 name = NULL;
660 else if (error != 0)
661 goto done_free;
662 else {
663 if (len == 0 || name[len - 1] != '\0') {
664 error = EINVAL;
665 goto done_free;
666 }
667 if (len > MAXHOSTNAMELEN) {
668 error = ENAMETOOLONG;
669 goto done_free;
670 }
671 }
672
673 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
674 if (error == ENOENT)
675 host = NULL;
676 else if (error != 0)
677 goto done_free;
678 else {
679 ch_flags |= PR_HOST;
680 pr_flags |= PR_HOST;
681 if (len == 0 || host[len - 1] != '\0') {
682 error = EINVAL;
683 goto done_free;
684 }
685 if (len > MAXHOSTNAMELEN) {
686 error = ENAMETOOLONG;
687 goto done_free;
688 }
689 }
690
691 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
692 if (error == ENOENT)
693 domain = NULL;
694 else if (error != 0)
695 goto done_free;
696 else {
697 ch_flags |= PR_HOST;
698 pr_flags |= PR_HOST;
699 if (len == 0 || domain[len - 1] != '\0') {
700 error = EINVAL;
701 goto done_free;
702 }
703 if (len > MAXHOSTNAMELEN) {
704 error = ENAMETOOLONG;
705 goto done_free;
706 }
707 }
708
709 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
710 if (error == ENOENT)
711 uuid = NULL;
712 else if (error != 0)
713 goto done_free;
714 else {
715 ch_flags |= PR_HOST;
716 pr_flags |= PR_HOST;
717 if (len == 0 || uuid[len - 1] != '\0') {
718 error = EINVAL;
719 goto done_free;
720 }
721 if (len > HOSTUUIDLEN) {
722 error = ENAMETOOLONG;
723 goto done_free;
724 }
725 }
726
727 #ifdef COMPAT_FREEBSD32
728 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
729 uint32_t hid32;
730
731 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
732 hid = hid32;
733 } else
734 #endif
735 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
736 if (error == ENOENT)
737 gothid = 0;
738 else if (error != 0)
739 goto done_free;
740 else {
741 gothid = 1;
742 ch_flags |= PR_HOST;
743 pr_flags |= PR_HOST;
744 }
745
746 #ifdef INET
747 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
748 if (error == ENOENT)
749 ip4s = 0;
750 else if (error != 0)
751 goto done_free;
752 else if (ip4s & (sizeof(*ip4) - 1)) {
753 error = EINVAL;
754 goto done_free;
755 } else {
756 ch_flags |= PR_IP4_USER;
757 pr_flags |= PR_IP4_USER;
758 if (ip4s > 0) {
759 ip4s /= sizeof(*ip4);
760 if (ip4s > jail_max_af_ips) {
761 error = EINVAL;
762 vfs_opterror(opts, "too many IPv4 addresses");
763 goto done_errmsg;
764 }
765 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
766 bcopy(op, ip4, ip4s * sizeof(*ip4));
767 /*
768 * IP addresses are all sorted but ip[0] to preserve
769 * the primary IP address as given from userland.
770 * This special IP is used for unbound outgoing
771 * connections as well for "loopback" traffic in case
772 * source address selection cannot find any more fitting
773 * address to connect from.
774 */
775 if (ip4s > 1)
776 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4),
777 prison_qcmp_v4);
778 /*
779 * Check for duplicate addresses and do some simple
780 * zero and broadcast checks. If users give other bogus
781 * addresses it is their problem.
782 *
783 * We do not have to care about byte order for these
784 * checks so we will do them in NBO.
785 */
786 for (ii = 0; ii < ip4s; ii++) {
787 if (ip4[ii].s_addr == INADDR_ANY ||
788 ip4[ii].s_addr == INADDR_BROADCAST) {
789 error = EINVAL;
790 goto done_free;
791 }
792 if ((ii+1) < ip4s &&
793 (ip4[0].s_addr == ip4[ii+1].s_addr ||
794 ip4[ii].s_addr == ip4[ii+1].s_addr)) {
795 error = EINVAL;
796 goto done_free;
797 }
798 }
799 }
800 }
801 #endif
802
803 #ifdef INET6
804 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
805 if (error == ENOENT)
806 ip6s = 0;
807 else if (error != 0)
808 goto done_free;
809 else if (ip6s & (sizeof(*ip6) - 1)) {
810 error = EINVAL;
811 goto done_free;
812 } else {
813 ch_flags |= PR_IP6_USER;
814 pr_flags |= PR_IP6_USER;
815 if (ip6s > 0) {
816 ip6s /= sizeof(*ip6);
817 if (ip6s > jail_max_af_ips) {
818 error = EINVAL;
819 vfs_opterror(opts, "too many IPv6 addresses");
820 goto done_errmsg;
821 }
822 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
823 bcopy(op, ip6, ip6s * sizeof(*ip6));
824 if (ip6s > 1)
825 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6),
826 prison_qcmp_v6);
827 for (ii = 0; ii < ip6s; ii++) {
828 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
829 error = EINVAL;
830 goto done_free;
831 }
832 if ((ii+1) < ip6s &&
833 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
834 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
835 {
836 error = EINVAL;
837 goto done_free;
838 }
839 }
840 }
841 }
842 #endif
843
844 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
845 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
846 error = EINVAL;
847 vfs_opterror(opts,
848 "vnet jails cannot have IP address restrictions");
849 goto done_errmsg;
850 }
851 #endif
852
853 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len);
854 if (error == ENOENT)
855 osrelstr = NULL;
856 else if (error != 0)
857 goto done_free;
858 else {
859 if (flags & JAIL_UPDATE) {
860 error = EINVAL;
861 vfs_opterror(opts,
862 "osrelease cannot be changed after creation");
863 goto done_errmsg;
864 }
865 if (len == 0 || osrelstr[len - 1] != '\0') {
866 error = EINVAL;
867 goto done_free;
868 }
869 if (len >= OSRELEASELEN) {
870 error = ENAMETOOLONG;
871 vfs_opterror(opts,
872 "osrelease string must be 1-%d bytes long",
873 OSRELEASELEN - 1);
874 goto done_errmsg;
875 }
876 }
877
878 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt));
879 if (error == ENOENT)
880 osreldt = 0;
881 else if (error != 0)
882 goto done_free;
883 else {
884 if (flags & JAIL_UPDATE) {
885 error = EINVAL;
886 vfs_opterror(opts,
887 "osreldate cannot be changed after creation");
888 goto done_errmsg;
889 }
890 if (osreldt == 0) {
891 error = EINVAL;
892 vfs_opterror(opts, "osreldate cannot be 0");
893 goto done_errmsg;
894 }
895 }
896
897 fullpath_disabled = 0;
898 root = NULL;
899 error = vfs_getopt(opts, "path", (void **)&path, &len);
900 if (error == ENOENT)
901 path = NULL;
902 else if (error != 0)
903 goto done_free;
904 else {
905 if (flags & JAIL_UPDATE) {
906 error = EINVAL;
907 vfs_opterror(opts,
908 "path cannot be changed after creation");
909 goto done_errmsg;
910 }
911 if (len == 0 || path[len - 1] != '\0') {
912 error = EINVAL;
913 goto done_free;
914 }
915 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
916 path, td);
917 error = namei(&nd);
918 if (error)
919 goto done_free;
920 root = nd.ni_vp;
921 NDFREE(&nd, NDF_ONLY_PNBUF);
922 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
923 strlcpy(g_path, path, MAXPATHLEN);
924 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
925 if (error == 0)
926 path = g_path;
927 else if (error == ENODEV) {
928 /* proceed if sysctl debug.disablefullpath == 1 */
929 fullpath_disabled = 1;
930 if (len < 2 || (len == 2 && path[0] == '/'))
931 path = NULL;
932 } else {
933 /* exit on other errors */
934 goto done_free;
935 }
936 if (root->v_type != VDIR) {
937 error = ENOTDIR;
938 vput(root);
939 goto done_free;
940 }
941 VOP_UNLOCK(root, 0);
942 if (fullpath_disabled) {
943 /* Leave room for a real-root full pathname. */
944 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/")
945 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) {
946 error = ENAMETOOLONG;
947 vrele(root);
948 goto done_free;
949 }
950 }
951 }
952
953 /*
954 * Find the specified jail, or at least its parent.
955 * This abuses the file error codes ENOENT and EEXIST.
956 */
957 pr = NULL;
958 ppr = mypr;
959 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
960 namelc = strrchr(name, '.');
961 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
962 if (*p != '\0')
963 jid = 0;
964 }
965 sx_xlock(&allprison_lock);
966 if (jid != 0) {
967 /*
968 * See if a requested jid already exists. There is an
969 * information leak here if the jid exists but is not within
970 * the caller's jail hierarchy. Jail creators will get EEXIST
971 * even though they cannot see the jail, and CREATE | UPDATE
972 * will return ENOENT which is not normally a valid error.
973 */
974 if (jid < 0) {
975 error = EINVAL;
976 vfs_opterror(opts, "negative jid");
977 goto done_unlock_list;
978 }
979 pr = prison_find(jid);
980 if (pr != NULL) {
981 ppr = pr->pr_parent;
982 /* Create: jid must not exist. */
983 if (cuflags == JAIL_CREATE) {
984 mtx_unlock(&pr->pr_mtx);
985 error = EEXIST;
986 vfs_opterror(opts, "jail %d already exists",
987 jid);
988 goto done_unlock_list;
989 }
990 if (!prison_ischild(mypr, pr)) {
991 mtx_unlock(&pr->pr_mtx);
992 pr = NULL;
993 } else if (pr->pr_uref == 0) {
994 if (!(flags & JAIL_DYING)) {
995 mtx_unlock(&pr->pr_mtx);
996 error = ENOENT;
997 vfs_opterror(opts, "jail %d is dying",
998 jid);
999 goto done_unlock_list;
1000 } else if ((flags & JAIL_ATTACH) ||
1001 (pr_flags & PR_PERSIST)) {
1002 /*
1003 * A dying jail might be resurrected
1004 * (via attach or persist), but first
1005 * it must determine if another jail
1006 * has claimed its name. Accomplish
1007 * this by implicitly re-setting the
1008 * name.
1009 */
1010 if (name == NULL)
1011 name = prison_name(mypr, pr);
1012 }
1013 }
1014 }
1015 if (pr == NULL) {
1016 /* Update: jid must exist. */
1017 if (cuflags == JAIL_UPDATE) {
1018 error = ENOENT;
1019 vfs_opterror(opts, "jail %d not found", jid);
1020 goto done_unlock_list;
1021 }
1022 }
1023 }
1024 /*
1025 * If the caller provided a name, look for a jail by that name.
1026 * This has different semantics for creates and updates keyed by jid
1027 * (where the name must not already exist in a different jail),
1028 * and updates keyed by the name itself (where the name must exist
1029 * because that is the jail being updated).
1030 */
1031 namelc = NULL;
1032 if (name != NULL) {
1033 namelc = strrchr(name, '.');
1034 if (namelc == NULL)
1035 namelc = name;
1036 else {
1037 /*
1038 * This is a hierarchical name. Split it into the
1039 * parent and child names, and make sure the parent
1040 * exists or matches an already found jail.
1041 */
1042 if (pr != NULL) {
1043 if (strncmp(name, ppr->pr_name, namelc - name)
1044 || ppr->pr_name[namelc - name] != '\0') {
1045 mtx_unlock(&pr->pr_mtx);
1046 error = EINVAL;
1047 vfs_opterror(opts,
1048 "cannot change jail's parent");
1049 goto done_unlock_list;
1050 }
1051 } else {
1052 *namelc = '\0';
1053 ppr = prison_find_name(mypr, name);
1054 if (ppr == NULL) {
1055 error = ENOENT;
1056 vfs_opterror(opts,
1057 "jail \"%s\" not found", name);
1058 goto done_unlock_list;
1059 }
1060 mtx_unlock(&ppr->pr_mtx);
1061 *namelc = '.';
1062 }
1063 namelc++;
1064 }
1065 if (namelc[0] != '\0') {
1066 pnamelen =
1067 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1068 name_again:
1069 deadpr = NULL;
1070 FOREACH_PRISON_CHILD(ppr, tpr) {
1071 if (tpr != pr && tpr->pr_ref > 0 &&
1072 !strcmp(tpr->pr_name + pnamelen, namelc)) {
1073 if (pr == NULL &&
1074 cuflags != JAIL_CREATE) {
1075 mtx_lock(&tpr->pr_mtx);
1076 if (tpr->pr_ref > 0) {
1077 /*
1078 * Use this jail
1079 * for updates.
1080 */
1081 if (tpr->pr_uref > 0) {
1082 pr = tpr;
1083 break;
1084 }
1085 deadpr = tpr;
1086 }
1087 mtx_unlock(&tpr->pr_mtx);
1088 } else if (tpr->pr_uref > 0) {
1089 /*
1090 * Create, or update(jid):
1091 * name must not exist in an
1092 * active sibling jail.
1093 */
1094 error = EEXIST;
1095 if (pr != NULL)
1096 mtx_unlock(&pr->pr_mtx);
1097 vfs_opterror(opts,
1098 "jail \"%s\" already exists",
1099 name);
1100 goto done_unlock_list;
1101 }
1102 }
1103 }
1104 /* If no active jail is found, use a dying one. */
1105 if (deadpr != NULL && pr == NULL) {
1106 if (flags & JAIL_DYING) {
1107 mtx_lock(&deadpr->pr_mtx);
1108 if (deadpr->pr_ref == 0) {
1109 mtx_unlock(&deadpr->pr_mtx);
1110 goto name_again;
1111 }
1112 pr = deadpr;
1113 } else if (cuflags == JAIL_UPDATE) {
1114 error = ENOENT;
1115 vfs_opterror(opts,
1116 "jail \"%s\" is dying", name);
1117 goto done_unlock_list;
1118 }
1119 }
1120 /* Update: name must exist if no jid. */
1121 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1122 error = ENOENT;
1123 vfs_opterror(opts, "jail \"%s\" not found",
1124 name);
1125 goto done_unlock_list;
1126 }
1127 }
1128 }
1129 /* Update: must provide a jid or name. */
1130 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1131 error = ENOENT;
1132 vfs_opterror(opts, "update specified no jail");
1133 goto done_unlock_list;
1134 }
1135
1136 /* If there's no prison to update, create a new one and link it in. */
1137 if (pr == NULL) {
1138 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1139 if (tpr->pr_childcount >= tpr->pr_childmax) {
1140 error = EPERM;
1141 vfs_opterror(opts, "prison limit exceeded");
1142 goto done_unlock_list;
1143 }
1144 created = 1;
1145 mtx_lock(&ppr->pr_mtx);
1146 if (ppr->pr_ref == 0) {
1147 mtx_unlock(&ppr->pr_mtx);
1148 error = ENOENT;
1149 vfs_opterror(opts, "jail \"%s\" not found",
1150 prison_name(mypr, ppr));
1151 goto done_unlock_list;
1152 }
1153 ppr->pr_ref++;
1154 ppr->pr_uref++;
1155 mtx_unlock(&ppr->pr_mtx);
1156 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1157 if (jid == 0) {
1158 /* Find the next free jid. */
1159 jid = lastprid + 1;
1160 findnext:
1161 if (jid == JAIL_MAX)
1162 jid = 1;
1163 TAILQ_FOREACH(tpr, &allprison, pr_list) {
1164 if (tpr->pr_id < jid)
1165 continue;
1166 if (tpr->pr_id > jid || tpr->pr_ref == 0) {
1167 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1168 break;
1169 }
1170 if (jid == lastprid) {
1171 error = EAGAIN;
1172 vfs_opterror(opts,
1173 "no available jail IDs");
1174 free(pr, M_PRISON);
1175 prison_deref(ppr, PD_DEREF |
1176 PD_DEUREF | PD_LIST_XLOCKED);
1177 goto done_releroot;
1178 }
1179 jid++;
1180 goto findnext;
1181 }
1182 lastprid = jid;
1183 } else {
1184 /*
1185 * The jail already has a jid (that did not yet exist),
1186 * so just find where to insert it.
1187 */
1188 TAILQ_FOREACH(tpr, &allprison, pr_list)
1189 if (tpr->pr_id >= jid) {
1190 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1191 break;
1192 }
1193 }
1194 if (tpr == NULL)
1195 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1196 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1197 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1198 tpr->pr_childcount++;
1199
1200 pr->pr_parent = ppr;
1201 pr->pr_id = jid;
1202
1203 /* Set some default values, and inherit some from the parent. */
1204 if (namelc == NULL)
1205 namelc = "";
1206 if (path == NULL) {
1207 path = "/";
1208 root = mypr->pr_root;
1209 vref(root);
1210 }
1211 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1212 pr->pr_flags |= PR_HOST;
1213 #if defined(INET) || defined(INET6)
1214 #ifdef VIMAGE
1215 if (!(pr_flags & PR_VNET))
1216 #endif
1217 {
1218 #ifdef INET
1219 if (!(ch_flags & PR_IP4_USER))
1220 pr->pr_flags |= PR_IP4 | PR_IP4_USER;
1221 else if (!(pr_flags & PR_IP4_USER)) {
1222 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1223 if (ppr->pr_ip4 != NULL) {
1224 pr->pr_ip4s = ppr->pr_ip4s;
1225 pr->pr_ip4 = malloc(pr->pr_ip4s *
1226 sizeof(struct in_addr), M_PRISON,
1227 M_WAITOK);
1228 bcopy(ppr->pr_ip4, pr->pr_ip4,
1229 pr->pr_ip4s * sizeof(*pr->pr_ip4));
1230 }
1231 }
1232 #endif
1233 #ifdef INET6
1234 if (!(ch_flags & PR_IP6_USER))
1235 pr->pr_flags |= PR_IP6 | PR_IP6_USER;
1236 else if (!(pr_flags & PR_IP6_USER)) {
1237 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1238 if (ppr->pr_ip6 != NULL) {
1239 pr->pr_ip6s = ppr->pr_ip6s;
1240 pr->pr_ip6 = malloc(pr->pr_ip6s *
1241 sizeof(struct in6_addr), M_PRISON,
1242 M_WAITOK);
1243 bcopy(ppr->pr_ip6, pr->pr_ip6,
1244 pr->pr_ip6s * sizeof(*pr->pr_ip6));
1245 }
1246 }
1247 #endif
1248 }
1249 #endif
1250 /* Source address selection is always on by default. */
1251 pr->pr_flags |= _PR_IP_SADDRSEL;
1252
1253 pr->pr_securelevel = ppr->pr_securelevel;
1254 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1255 pr->pr_enforce_statfs = jail_default_enforce_statfs;
1256 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
1257
1258 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate;
1259 if (osrelstr == NULL)
1260 strlcpy(pr->pr_osrelease, ppr->pr_osrelease,
1261 sizeof(pr->pr_osrelease));
1262 else
1263 strlcpy(pr->pr_osrelease, osrelstr,
1264 sizeof(pr->pr_osrelease));
1265
1266 LIST_INIT(&pr->pr_children);
1267 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1268 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
1269
1270 #ifdef VIMAGE
1271 /* Allocate a new vnet if specified. */
1272 pr->pr_vnet = (pr_flags & PR_VNET)
1273 ? vnet_alloc() : ppr->pr_vnet;
1274 #endif
1275 /*
1276 * Allocate a dedicated cpuset for each jail.
1277 * Unlike other initial settings, this may return an erorr.
1278 */
1279 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1280 if (error) {
1281 prison_deref(pr, PD_LIST_XLOCKED);
1282 goto done_releroot;
1283 }
1284
1285 mtx_lock(&pr->pr_mtx);
1286 /*
1287 * New prisons do not yet have a reference, because we do not
1288 * want others to see the incomplete prison once the
1289 * allprison_lock is downgraded.
1290 */
1291 } else {
1292 created = 0;
1293 /*
1294 * Grab a reference for existing prisons, to ensure they
1295 * continue to exist for the duration of the call.
1296 */
1297 pr->pr_ref++;
1298 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1299 if ((pr->pr_flags & PR_VNET) &&
1300 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1301 error = EINVAL;
1302 vfs_opterror(opts,
1303 "vnet jails cannot have IP address restrictions");
1304 goto done_deref_locked;
1305 }
1306 #endif
1307 #ifdef INET
1308 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1309 error = EINVAL;
1310 vfs_opterror(opts,
1311 "ip4 cannot be changed after creation");
1312 goto done_deref_locked;
1313 }
1314 #endif
1315 #ifdef INET6
1316 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1317 error = EINVAL;
1318 vfs_opterror(opts,
1319 "ip6 cannot be changed after creation");
1320 goto done_deref_locked;
1321 }
1322 #endif
1323 }
1324
1325 /* Do final error checking before setting anything. */
1326 if (gotslevel) {
1327 if (slevel < ppr->pr_securelevel) {
1328 error = EPERM;
1329 goto done_deref_locked;
1330 }
1331 }
1332 if (gotchildmax) {
1333 if (childmax >= ppr->pr_childmax) {
1334 error = EPERM;
1335 goto done_deref_locked;
1336 }
1337 }
1338 if (gotenforce) {
1339 if (enforce < ppr->pr_enforce_statfs) {
1340 error = EPERM;
1341 goto done_deref_locked;
1342 }
1343 }
1344 if (gotrsnum) {
1345 /*
1346 * devfs_rsnum is a uint16_t
1347 */
1348 if (rsnum < 0 || rsnum > 65535) {
1349 error = EINVAL;
1350 goto done_deref_locked;
1351 }
1352 /*
1353 * Nested jails always inherit parent's devfs ruleset
1354 */
1355 if (jailed(td->td_ucred)) {
1356 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
1357 error = EPERM;
1358 goto done_deref_locked;
1359 } else
1360 rsnum = ppr->pr_devfs_rsnum;
1361 }
1362 }
1363 #ifdef INET
1364 if (ip4s > 0) {
1365 if (ppr->pr_flags & PR_IP4) {
1366 /*
1367 * Make sure the new set of IP addresses is a
1368 * subset of the parent's list. Don't worry
1369 * about the parent being unlocked, as any
1370 * setting is done with allprison_lock held.
1371 */
1372 for (ij = 0; ij < ppr->pr_ip4s; ij++)
1373 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
1374 break;
1375 if (ij == ppr->pr_ip4s) {
1376 error = EPERM;
1377 goto done_deref_locked;
1378 }
1379 if (ip4s > 1) {
1380 for (ii = ij = 1; ii < ip4s; ii++) {
1381 if (ip4[ii].s_addr ==
1382 ppr->pr_ip4[0].s_addr)
1383 continue;
1384 for (; ij < ppr->pr_ip4s; ij++)
1385 if (ip4[ii].s_addr ==
1386 ppr->pr_ip4[ij].s_addr)
1387 break;
1388 if (ij == ppr->pr_ip4s)
1389 break;
1390 }
1391 if (ij == ppr->pr_ip4s) {
1392 error = EPERM;
1393 goto done_deref_locked;
1394 }
1395 }
1396 }
1397 /*
1398 * Check for conflicting IP addresses. We permit them
1399 * if there is no more than one IP on each jail. If
1400 * there is a duplicate on a jail with more than one
1401 * IP stop checking and return error.
1402 */
1403 #ifdef VIMAGE
1404 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent)
1405 if (tppr->pr_flags & PR_VNET)
1406 break;
1407 #else
1408 tppr = &prison0;
1409 #endif
1410 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1411 if (tpr == pr ||
1412 #ifdef VIMAGE
1413 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1414 #endif
1415 tpr->pr_uref == 0) {
1416 descend = 0;
1417 continue;
1418 }
1419 if (!(tpr->pr_flags & PR_IP4_USER))
1420 continue;
1421 descend = 0;
1422 if (tpr->pr_ip4 == NULL ||
1423 (ip4s == 1 && tpr->pr_ip4s == 1))
1424 continue;
1425 for (ii = 0; ii < ip4s; ii++) {
1426 if (prison_check_ip4_locked(tpr, &ip4[ii]) ==
1427 0) {
1428 error = EADDRINUSE;
1429 vfs_opterror(opts,
1430 "IPv4 addresses clash");
1431 goto done_deref_locked;
1432 }
1433 }
1434 }
1435 }
1436 #endif
1437 #ifdef INET6
1438 if (ip6s > 0) {
1439 if (ppr->pr_flags & PR_IP6) {
1440 /*
1441 * Make sure the new set of IP addresses is a
1442 * subset of the parent's list.
1443 */
1444 for (ij = 0; ij < ppr->pr_ip6s; ij++)
1445 if (IN6_ARE_ADDR_EQUAL(&ip6[0],
1446 &ppr->pr_ip6[ij]))
1447 break;
1448 if (ij == ppr->pr_ip6s) {
1449 error = EPERM;
1450 goto done_deref_locked;
1451 }
1452 if (ip6s > 1) {
1453 for (ii = ij = 1; ii < ip6s; ii++) {
1454 if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
1455 &ppr->pr_ip6[0]))
1456 continue;
1457 for (; ij < ppr->pr_ip6s; ij++)
1458 if (IN6_ARE_ADDR_EQUAL(
1459 &ip6[ii], &ppr->pr_ip6[ij]))
1460 break;
1461 if (ij == ppr->pr_ip6s)
1462 break;
1463 }
1464 if (ij == ppr->pr_ip6s) {
1465 error = EPERM;
1466 goto done_deref_locked;
1467 }
1468 }
1469 }
1470 /* Check for conflicting IP addresses. */
1471 #ifdef VIMAGE
1472 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent)
1473 if (tppr->pr_flags & PR_VNET)
1474 break;
1475 #else
1476 tppr = &prison0;
1477 #endif
1478 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1479 if (tpr == pr ||
1480 #ifdef VIMAGE
1481 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1482 #endif
1483 tpr->pr_uref == 0) {
1484 descend = 0;
1485 continue;
1486 }
1487 if (!(tpr->pr_flags & PR_IP6_USER))
1488 continue;
1489 descend = 0;
1490 if (tpr->pr_ip6 == NULL ||
1491 (ip6s == 1 && tpr->pr_ip6s == 1))
1492 continue;
1493 for (ii = 0; ii < ip6s; ii++) {
1494 if (prison_check_ip6_locked(tpr, &ip6[ii]) ==
1495 0) {
1496 error = EADDRINUSE;
1497 vfs_opterror(opts,
1498 "IPv6 addresses clash");
1499 goto done_deref_locked;
1500 }
1501 }
1502 }
1503 }
1504 #endif
1505 onamelen = namelen = 0;
1506 if (namelc != NULL) {
1507 /* Give a default name of the jid. Also allow the name to be
1508 * explicitly the jid - but not any other number, and only in
1509 * normal form (no leading zero/etc).
1510 */
1511 if (namelc[0] == '\0')
1512 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid);
1513 else if ((strtoul(namelc, &p, 10) != jid ||
1514 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') {
1515 error = EINVAL;
1516 vfs_opterror(opts,
1517 "name cannot be numeric (unless it is the jid)");
1518 goto done_deref_locked;
1519 }
1520 /*
1521 * Make sure the name isn't too long for the prison or its
1522 * children.
1523 */
1524 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1525 onamelen = strlen(pr->pr_name + pnamelen);
1526 namelen = strlen(namelc);
1527 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) {
1528 error = ENAMETOOLONG;
1529 goto done_deref_locked;
1530 }
1531 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1532 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
1533 sizeof(pr->pr_name)) {
1534 error = ENAMETOOLONG;
1535 goto done_deref_locked;
1536 }
1537 }
1538 }
1539 if (pr_allow & ~ppr->pr_allow) {
1540 error = EPERM;
1541 goto done_deref_locked;
1542 }
1543
1544 /*
1545 * Let modules check their parameters. This requires unlocking and
1546 * then re-locking the prison, but this is still a valid state as long
1547 * as allprison_lock remains xlocked.
1548 */
1549 mtx_unlock(&pr->pr_mtx);
1550 error = osd_jail_call(pr, PR_METHOD_CHECK, opts);
1551 if (error != 0) {
1552 prison_deref(pr, created
1553 ? PD_LIST_XLOCKED
1554 : PD_DEREF | PD_LIST_XLOCKED);
1555 goto done_releroot;
1556 }
1557 mtx_lock(&pr->pr_mtx);
1558
1559 /* At this point, all valid parameters should have been noted. */
1560 TAILQ_FOREACH(opt, opts, link) {
1561 if (!opt->seen && strcmp(opt->name, "errmsg")) {
1562 error = EINVAL;
1563 vfs_opterror(opts, "unknown parameter: %s", opt->name);
1564 goto done_deref_locked;
1565 }
1566 }
1567
1568 /* Set the parameters of the prison. */
1569 #ifdef INET
1570 redo_ip4 = 0;
1571 if (pr_flags & PR_IP4_USER) {
1572 pr->pr_flags |= PR_IP4;
1573 free(pr->pr_ip4, M_PRISON);
1574 pr->pr_ip4s = ip4s;
1575 pr->pr_ip4 = ip4;
1576 ip4 = NULL;
1577 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1578 #ifdef VIMAGE
1579 if (tpr->pr_flags & PR_VNET) {
1580 descend = 0;
1581 continue;
1582 }
1583 #endif
1584 if (prison_restrict_ip4(tpr, NULL)) {
1585 redo_ip4 = 1;
1586 descend = 0;
1587 }
1588 }
1589 }
1590 #endif
1591 #ifdef INET6
1592 redo_ip6 = 0;
1593 if (pr_flags & PR_IP6_USER) {
1594 pr->pr_flags |= PR_IP6;
1595 free(pr->pr_ip6, M_PRISON);
1596 pr->pr_ip6s = ip6s;
1597 pr->pr_ip6 = ip6;
1598 ip6 = NULL;
1599 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1600 #ifdef VIMAGE
1601 if (tpr->pr_flags & PR_VNET) {
1602 descend = 0;
1603 continue;
1604 }
1605 #endif
1606 if (prison_restrict_ip6(tpr, NULL)) {
1607 redo_ip6 = 1;
1608 descend = 0;
1609 }
1610 }
1611 }
1612 #endif
1613 if (gotslevel) {
1614 pr->pr_securelevel = slevel;
1615 /* Set all child jails to be at least this level. */
1616 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1617 if (tpr->pr_securelevel < slevel)
1618 tpr->pr_securelevel = slevel;
1619 }
1620 if (gotchildmax) {
1621 pr->pr_childmax = childmax;
1622 /* Set all child jails to under this limit. */
1623 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
1624 if (tpr->pr_childmax > childmax - level)
1625 tpr->pr_childmax = childmax > level
1626 ? childmax - level : 0;
1627 }
1628 if (gotenforce) {
1629 pr->pr_enforce_statfs = enforce;
1630 /* Pass this restriction on to the children. */
1631 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1632 if (tpr->pr_enforce_statfs < enforce)
1633 tpr->pr_enforce_statfs = enforce;
1634 }
1635 if (gotrsnum) {
1636 pr->pr_devfs_rsnum = rsnum;
1637 /* Pass this restriction on to the children. */
1638 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1639 tpr->pr_devfs_rsnum = rsnum;
1640 }
1641 if (namelc != NULL) {
1642 if (ppr == &prison0)
1643 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name));
1644 else
1645 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
1646 ppr->pr_name, namelc);
1647 /* Change this component of child names. */
1648 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1649 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
1650 strlen(tpr->pr_name + onamelen) + 1);
1651 bcopy(pr->pr_name, tpr->pr_name, namelen);
1652 }
1653 }
1654 if (path != NULL) {
1655 /* Try to keep a real-rooted full pathname. */
1656 if (fullpath_disabled && path[0] == '/' &&
1657 strcmp(mypr->pr_path, "/"))
1658 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s",
1659 mypr->pr_path, path);
1660 else
1661 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
1662 pr->pr_root = root;
1663 }
1664 if (PR_HOST & ch_flags & ~pr_flags) {
1665 if (pr->pr_flags & PR_HOST) {
1666 /*
1667 * Copy the parent's host info. As with pr_ip4 above,
1668 * the lack of a lock on the parent is not a problem;
1669 * it is always set with allprison_lock at least
1670 * shared, and is held exclusively here.
1671 */
1672 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
1673 sizeof(pr->pr_hostname));
1674 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
1675 sizeof(pr->pr_domainname));
1676 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
1677 sizeof(pr->pr_hostuuid));
1678 pr->pr_hostid = pr->pr_parent->pr_hostid;
1679 }
1680 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
1681 /* Set this prison, and any descendants without PR_HOST. */
1682 if (host != NULL)
1683 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
1684 if (domain != NULL)
1685 strlcpy(pr->pr_domainname, domain,
1686 sizeof(pr->pr_domainname));
1687 if (uuid != NULL)
1688 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
1689 if (gothid)
1690 pr->pr_hostid = hid;
1691 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1692 if (tpr->pr_flags & PR_HOST)
1693 descend = 0;
1694 else {
1695 if (host != NULL)
1696 strlcpy(tpr->pr_hostname,
1697 pr->pr_hostname,
1698 sizeof(tpr->pr_hostname));
1699 if (domain != NULL)
1700 strlcpy(tpr->pr_domainname,
1701 pr->pr_domainname,
1702 sizeof(tpr->pr_domainname));
1703 if (uuid != NULL)
1704 strlcpy(tpr->pr_hostuuid,
1705 pr->pr_hostuuid,
1706 sizeof(tpr->pr_hostuuid));
1707 if (gothid)
1708 tpr->pr_hostid = hid;
1709 }
1710 }
1711 }
1712 if ((tallow = ch_allow & ~pr_allow)) {
1713 /* Clear allow bits in all children. */
1714 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1715 tpr->pr_allow &= ~tallow;
1716 }
1717 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
1718 /*
1719 * Persistent prisons get an extra reference, and prisons losing their
1720 * persist flag lose that reference. Only do this for existing prisons
1721 * for now, so new ones will remain unseen until after the module
1722 * handlers have completed.
1723 */
1724 born = pr->pr_uref == 0;
1725 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) {
1726 if (pr_flags & PR_PERSIST) {
1727 pr->pr_ref++;
1728 pr->pr_uref++;
1729 } else {
1730 pr->pr_ref--;
1731 pr->pr_uref--;
1732 }
1733 }
1734 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
1735 mtx_unlock(&pr->pr_mtx);
1736
1737 #ifdef RACCT
1738 if (racct_enable && created)
1739 prison_racct_attach(pr);
1740 #endif
1741
1742 /* Locks may have prevented a complete restriction of child IP
1743 * addresses. If so, allocate some more memory and try again.
1744 */
1745 #ifdef INET
1746 while (redo_ip4) {
1747 ip4s = pr->pr_ip4s;
1748 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
1749 mtx_lock(&pr->pr_mtx);
1750 redo_ip4 = 0;
1751 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1752 #ifdef VIMAGE
1753 if (tpr->pr_flags & PR_VNET) {
1754 descend = 0;
1755 continue;
1756 }
1757 #endif
1758 if (prison_restrict_ip4(tpr, ip4)) {
1759 if (ip4 != NULL)
1760 ip4 = NULL;
1761 else
1762 redo_ip4 = 1;
1763 }
1764 }
1765 mtx_unlock(&pr->pr_mtx);
1766 }
1767 #endif
1768 #ifdef INET6
1769 while (redo_ip6) {
1770 ip6s = pr->pr_ip6s;
1771 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
1772 mtx_lock(&pr->pr_mtx);
1773 redo_ip6 = 0;
1774 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1775 #ifdef VIMAGE
1776 if (tpr->pr_flags & PR_VNET) {
1777 descend = 0;
1778 continue;
1779 }
1780 #endif
1781 if (prison_restrict_ip6(tpr, ip6)) {
1782 if (ip6 != NULL)
1783 ip6 = NULL;
1784 else
1785 redo_ip6 = 1;
1786 }
1787 }
1788 mtx_unlock(&pr->pr_mtx);
1789 }
1790 #endif
1791
1792 /* Let the modules do their work. */
1793 sx_downgrade(&allprison_lock);
1794 if (born) {
1795 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
1796 if (error) {
1797 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
1798 prison_deref(pr, created
1799 ? PD_LIST_SLOCKED
1800 : PD_DEREF | PD_LIST_SLOCKED);
1801 goto done_errmsg;
1802 }
1803 }
1804 error = osd_jail_call(pr, PR_METHOD_SET, opts);
1805 if (error) {
1806 if (born)
1807 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
1808 prison_deref(pr, created
1809 ? PD_LIST_SLOCKED
1810 : PD_DEREF | PD_LIST_SLOCKED);
1811 goto done_errmsg;
1812 }
1813
1814 /* Attach this process to the prison if requested. */
1815 if (flags & JAIL_ATTACH) {
1816 mtx_lock(&pr->pr_mtx);
1817 error = do_jail_attach(td, pr);
1818 if (error) {
1819 vfs_opterror(opts, "attach failed");
1820 if (!created)
1821 prison_deref(pr, PD_DEREF);
1822 goto done_errmsg;
1823 }
1824 }
1825
1826 #ifdef RACCT
1827 if (racct_enable && !created) {
1828 if (!(flags & JAIL_ATTACH))
1829 sx_sunlock(&allprison_lock);
1830 prison_racct_modify(pr);
1831 if (!(flags & JAIL_ATTACH))
1832 sx_slock(&allprison_lock);
1833 }
1834 #endif
1835
1836 td->td_retval[0] = pr->pr_id;
1837
1838 /*
1839 * Now that it is all there, drop the temporary reference from existing
1840 * prisons. Or add a reference to newly created persistent prisons
1841 * (which was not done earlier so that the prison would not be publicly
1842 * visible).
1843 */
1844 if (!created) {
1845 prison_deref(pr, (flags & JAIL_ATTACH)
1846 ? PD_DEREF
1847 : PD_DEREF | PD_LIST_SLOCKED);
1848 } else {
1849 if (pr_flags & PR_PERSIST) {
1850 mtx_lock(&pr->pr_mtx);
1851 pr->pr_ref++;
1852 pr->pr_uref++;
1853 mtx_unlock(&pr->pr_mtx);
1854 }
1855 if (!(flags & JAIL_ATTACH))
1856 sx_sunlock(&allprison_lock);
1857 }
1858
1859 goto done_free;
1860
1861 done_deref_locked:
1862 prison_deref(pr, created
1863 ? PD_LOCKED | PD_LIST_XLOCKED
1864 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
1865 goto done_releroot;
1866 done_unlock_list:
1867 sx_xunlock(&allprison_lock);
1868 done_releroot:
1869 if (root != NULL)
1870 vrele(root);
1871 done_errmsg:
1872 if (error) {
1873 if (vfs_getopt(opts, "errmsg", (void **)&errmsg,
1874 &errmsg_len) == 0 && errmsg_len > 0) {
1875 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
1876 if (optuio->uio_segflg == UIO_SYSSPACE)
1877 bcopy(errmsg,
1878 optuio->uio_iov[errmsg_pos].iov_base,
1879 errmsg_len);
1880 else
1881 copyout(errmsg,
1882 optuio->uio_iov[errmsg_pos].iov_base,
1883 errmsg_len);
1884 }
1885 }
1886 done_free:
1887 #ifdef INET
1888 free(ip4, M_PRISON);
1889 #endif
1890 #ifdef INET6
1891 free(ip6, M_PRISON);
1892 #endif
1893 if (g_path != NULL)
1894 free(g_path, M_TEMP);
1895 vfs_freeopts(opts);
1896 return (error);
1897 }
1898
1899
1900 /*
1901 * struct jail_get_args {
1902 * struct iovec *iovp;
1903 * unsigned int iovcnt;
1904 * int flags;
1905 * };
1906 */
1907 int
sys_jail_get(struct thread * td,struct jail_get_args * uap)1908 sys_jail_get(struct thread *td, struct jail_get_args *uap)
1909 {
1910 struct uio *auio;
1911 int error;
1912
1913 /* Check that we have an even number of iovecs. */
1914 if (uap->iovcnt & 1)
1915 return (EINVAL);
1916
1917 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
1918 if (error)
1919 return (error);
1920 error = kern_jail_get(td, auio, uap->flags);
1921 if (error == 0)
1922 error = copyout(auio->uio_iov, uap->iovp,
1923 uap->iovcnt * sizeof (struct iovec));
1924 free(auio, M_IOV);
1925 return (error);
1926 }
1927
1928 int
kern_jail_get(struct thread * td,struct uio * optuio,int flags)1929 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
1930 {
1931 struct bool_flags *bf;
1932 struct jailsys_flags *jsf;
1933 struct prison *pr, *mypr;
1934 struct vfsopt *opt;
1935 struct vfsoptlist *opts;
1936 char *errmsg, *name;
1937 int error, errmsg_len, errmsg_pos, i, jid, len, locked, pos;
1938 unsigned f;
1939
1940 if (flags & ~JAIL_GET_MASK)
1941 return (EINVAL);
1942
1943 /* Get the parameter list. */
1944 error = vfs_buildopts(optuio, &opts);
1945 if (error)
1946 return (error);
1947 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
1948 mypr = td->td_ucred->cr_prison;
1949
1950 /*
1951 * Find the prison specified by one of: lastjid, jid, name.
1952 */
1953 sx_slock(&allprison_lock);
1954 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
1955 if (error == 0) {
1956 TAILQ_FOREACH(pr, &allprison, pr_list) {
1957 if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
1958 mtx_lock(&pr->pr_mtx);
1959 if (pr->pr_ref > 0 &&
1960 (pr->pr_uref > 0 || (flags & JAIL_DYING)))
1961 break;
1962 mtx_unlock(&pr->pr_mtx);
1963 }
1964 }
1965 if (pr != NULL)
1966 goto found_prison;
1967 error = ENOENT;
1968 vfs_opterror(opts, "no jail after %d", jid);
1969 goto done_unlock_list;
1970 } else if (error != ENOENT)
1971 goto done_unlock_list;
1972
1973 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
1974 if (error == 0) {
1975 if (jid != 0) {
1976 pr = prison_find_child(mypr, jid);
1977 if (pr != NULL) {
1978 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1979 mtx_unlock(&pr->pr_mtx);
1980 error = ENOENT;
1981 vfs_opterror(opts, "jail %d is dying",
1982 jid);
1983 goto done_unlock_list;
1984 }
1985 goto found_prison;
1986 }
1987 error = ENOENT;
1988 vfs_opterror(opts, "jail %d not found", jid);
1989 goto done_unlock_list;
1990 }
1991 } else if (error != ENOENT)
1992 goto done_unlock_list;
1993
1994 error = vfs_getopt(opts, "name", (void **)&name, &len);
1995 if (error == 0) {
1996 if (len == 0 || name[len - 1] != '\0') {
1997 error = EINVAL;
1998 goto done_unlock_list;
1999 }
2000 pr = prison_find_name(mypr, name);
2001 if (pr != NULL) {
2002 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
2003 mtx_unlock(&pr->pr_mtx);
2004 error = ENOENT;
2005 vfs_opterror(opts, "jail \"%s\" is dying",
2006 name);
2007 goto done_unlock_list;
2008 }
2009 goto found_prison;
2010 }
2011 error = ENOENT;
2012 vfs_opterror(opts, "jail \"%s\" not found", name);
2013 goto done_unlock_list;
2014 } else if (error != ENOENT)
2015 goto done_unlock_list;
2016
2017 vfs_opterror(opts, "no jail specified");
2018 error = ENOENT;
2019 goto done_unlock_list;
2020
2021 found_prison:
2022 /* Get the parameters of the prison. */
2023 pr->pr_ref++;
2024 locked = PD_LOCKED;
2025 td->td_retval[0] = pr->pr_id;
2026 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
2027 if (error != 0 && error != ENOENT)
2028 goto done_deref;
2029 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
2030 error = vfs_setopt(opts, "parent", &i, sizeof(i));
2031 if (error != 0 && error != ENOENT)
2032 goto done_deref;
2033 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
2034 if (error != 0 && error != ENOENT)
2035 goto done_deref;
2036 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
2037 sizeof(pr->pr_cpuset->cs_id));
2038 if (error != 0 && error != ENOENT)
2039 goto done_deref;
2040 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
2041 if (error != 0 && error != ENOENT)
2042 goto done_deref;
2043 #ifdef INET
2044 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
2045 pr->pr_ip4s * sizeof(*pr->pr_ip4));
2046 if (error != 0 && error != ENOENT)
2047 goto done_deref;
2048 #endif
2049 #ifdef INET6
2050 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
2051 pr->pr_ip6s * sizeof(*pr->pr_ip6));
2052 if (error != 0 && error != ENOENT)
2053 goto done_deref;
2054 #endif
2055 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
2056 sizeof(pr->pr_securelevel));
2057 if (error != 0 && error != ENOENT)
2058 goto done_deref;
2059 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
2060 sizeof(pr->pr_childcount));
2061 if (error != 0 && error != ENOENT)
2062 goto done_deref;
2063 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
2064 sizeof(pr->pr_childmax));
2065 if (error != 0 && error != ENOENT)
2066 goto done_deref;
2067 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
2068 if (error != 0 && error != ENOENT)
2069 goto done_deref;
2070 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
2071 if (error != 0 && error != ENOENT)
2072 goto done_deref;
2073 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
2074 if (error != 0 && error != ENOENT)
2075 goto done_deref;
2076 #ifdef COMPAT_FREEBSD32
2077 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
2078 uint32_t hid32 = pr->pr_hostid;
2079
2080 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
2081 } else
2082 #endif
2083 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
2084 sizeof(pr->pr_hostid));
2085 if (error != 0 && error != ENOENT)
2086 goto done_deref;
2087 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
2088 sizeof(pr->pr_enforce_statfs));
2089 if (error != 0 && error != ENOENT)
2090 goto done_deref;
2091 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
2092 sizeof(pr->pr_devfs_rsnum));
2093 if (error != 0 && error != ENOENT)
2094 goto done_deref;
2095 for (bf = pr_flag_bool;
2096 bf < pr_flag_bool + nitems(pr_flag_bool);
2097 bf++) {
2098 i = (pr->pr_flags & bf->flag) ? 1 : 0;
2099 error = vfs_setopt(opts, bf->name, &i, sizeof(i));
2100 if (error != 0 && error != ENOENT)
2101 goto done_deref;
2102 i = !i;
2103 error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
2104 if (error != 0 && error != ENOENT)
2105 goto done_deref;
2106 }
2107 for (jsf = pr_flag_jailsys;
2108 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
2109 jsf++) {
2110 f = pr->pr_flags & (jsf->disable | jsf->new);
2111 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE
2112 : (f == jsf->new) ? JAIL_SYS_NEW
2113 : JAIL_SYS_INHERIT;
2114 error = vfs_setopt(opts, jsf->name, &i, sizeof(i));
2115 if (error != 0 && error != ENOENT)
2116 goto done_deref;
2117 }
2118 for (bf = pr_flag_allow;
2119 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0;
2120 bf++) {
2121 i = (pr->pr_allow & bf->flag) ? 1 : 0;
2122 error = vfs_setopt(opts, bf->name, &i, sizeof(i));
2123 if (error != 0 && error != ENOENT)
2124 goto done_deref;
2125 i = !i;
2126 error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
2127 if (error != 0 && error != ENOENT)
2128 goto done_deref;
2129 }
2130 i = (pr->pr_uref == 0);
2131 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2132 if (error != 0 && error != ENOENT)
2133 goto done_deref;
2134 i = !i;
2135 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2136 if (error != 0 && error != ENOENT)
2137 goto done_deref;
2138 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate,
2139 sizeof(pr->pr_osreldate));
2140 if (error != 0 && error != ENOENT)
2141 goto done_deref;
2142 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease);
2143 if (error != 0 && error != ENOENT)
2144 goto done_deref;
2145
2146 /* Get the module parameters. */
2147 mtx_unlock(&pr->pr_mtx);
2148 locked = 0;
2149 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2150 if (error)
2151 goto done_deref;
2152 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
2153
2154 /* By now, all parameters should have been noted. */
2155 TAILQ_FOREACH(opt, opts, link) {
2156 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2157 error = EINVAL;
2158 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2159 goto done_errmsg;
2160 }
2161 }
2162
2163 /* Write the fetched parameters back to userspace. */
2164 error = 0;
2165 TAILQ_FOREACH(opt, opts, link) {
2166 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2167 pos = 2 * opt->pos + 1;
2168 optuio->uio_iov[pos].iov_len = opt->len;
2169 if (opt->value != NULL) {
2170 if (optuio->uio_segflg == UIO_SYSSPACE) {
2171 bcopy(opt->value,
2172 optuio->uio_iov[pos].iov_base,
2173 opt->len);
2174 } else {
2175 error = copyout(opt->value,
2176 optuio->uio_iov[pos].iov_base,
2177 opt->len);
2178 if (error)
2179 break;
2180 }
2181 }
2182 }
2183 }
2184 goto done_errmsg;
2185
2186 done_deref:
2187 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
2188 goto done_errmsg;
2189
2190 done_unlock_list:
2191 sx_sunlock(&allprison_lock);
2192 done_errmsg:
2193 if (error && errmsg_pos >= 0) {
2194 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2195 errmsg_pos = 2 * errmsg_pos + 1;
2196 if (errmsg_len > 0) {
2197 if (optuio->uio_segflg == UIO_SYSSPACE)
2198 bcopy(errmsg,
2199 optuio->uio_iov[errmsg_pos].iov_base,
2200 errmsg_len);
2201 else
2202 copyout(errmsg,
2203 optuio->uio_iov[errmsg_pos].iov_base,
2204 errmsg_len);
2205 }
2206 }
2207 vfs_freeopts(opts);
2208 return (error);
2209 }
2210
2211
2212 /*
2213 * struct jail_remove_args {
2214 * int jid;
2215 * };
2216 */
2217 int
sys_jail_remove(struct thread * td,struct jail_remove_args * uap)2218 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
2219 {
2220 struct prison *pr, *cpr, *lpr, *tpr;
2221 int descend, error;
2222
2223 error = priv_check(td, PRIV_JAIL_REMOVE);
2224 if (error)
2225 return (error);
2226
2227 sx_xlock(&allprison_lock);
2228 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2229 if (pr == NULL) {
2230 sx_xunlock(&allprison_lock);
2231 return (EINVAL);
2232 }
2233
2234 /* Remove all descendants of this prison, then remove this prison. */
2235 pr->pr_ref++;
2236 if (!LIST_EMPTY(&pr->pr_children)) {
2237 mtx_unlock(&pr->pr_mtx);
2238 lpr = NULL;
2239 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
2240 mtx_lock(&cpr->pr_mtx);
2241 if (cpr->pr_ref > 0) {
2242 tpr = cpr;
2243 cpr->pr_ref++;
2244 } else {
2245 /* Already removed - do not do it again. */
2246 tpr = NULL;
2247 }
2248 mtx_unlock(&cpr->pr_mtx);
2249 if (lpr != NULL) {
2250 mtx_lock(&lpr->pr_mtx);
2251 prison_remove_one(lpr);
2252 sx_xlock(&allprison_lock);
2253 }
2254 lpr = tpr;
2255 }
2256 if (lpr != NULL) {
2257 mtx_lock(&lpr->pr_mtx);
2258 prison_remove_one(lpr);
2259 sx_xlock(&allprison_lock);
2260 }
2261 mtx_lock(&pr->pr_mtx);
2262 }
2263 prison_remove_one(pr);
2264 return (0);
2265 }
2266
2267 static void
prison_remove_one(struct prison * pr)2268 prison_remove_one(struct prison *pr)
2269 {
2270 struct proc *p;
2271 int deuref;
2272
2273 /* If the prison was persistent, it is not anymore. */
2274 deuref = 0;
2275 if (pr->pr_flags & PR_PERSIST) {
2276 pr->pr_ref--;
2277 deuref = PD_DEUREF;
2278 pr->pr_flags &= ~PR_PERSIST;
2279 }
2280
2281 /*
2282 * jail_remove added a reference. If that's the only one, remove
2283 * the prison now.
2284 */
2285 KASSERT(pr->pr_ref > 0,
2286 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
2287 if (pr->pr_ref == 1) {
2288 prison_deref(pr,
2289 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
2290 return;
2291 }
2292
2293 mtx_unlock(&pr->pr_mtx);
2294 sx_xunlock(&allprison_lock);
2295 /*
2296 * Kill all processes unfortunate enough to be attached to this prison.
2297 */
2298 sx_slock(&allproc_lock);
2299 FOREACH_PROC_IN_SYSTEM(p) {
2300 PROC_LOCK(p);
2301 if (p->p_state != PRS_NEW && p->p_ucred &&
2302 p->p_ucred->cr_prison == pr)
2303 kern_psignal(p, SIGKILL);
2304 PROC_UNLOCK(p);
2305 }
2306 sx_sunlock(&allproc_lock);
2307 /* Remove the temporary reference added by jail_remove. */
2308 prison_deref(pr, deuref | PD_DEREF);
2309 }
2310
2311
2312 /*
2313 * struct jail_attach_args {
2314 * int jid;
2315 * };
2316 */
2317 int
sys_jail_attach(struct thread * td,struct jail_attach_args * uap)2318 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
2319 {
2320 struct prison *pr;
2321 int error;
2322
2323 error = priv_check(td, PRIV_JAIL_ATTACH);
2324 if (error)
2325 return (error);
2326
2327 /*
2328 * Start with exclusive hold on allprison_lock to ensure that a possible
2329 * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove.
2330 * But then immediately downgrade it since we don't need to stop
2331 * readers.
2332 */
2333 sx_xlock(&allprison_lock);
2334 sx_downgrade(&allprison_lock);
2335 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2336 if (pr == NULL) {
2337 sx_sunlock(&allprison_lock);
2338 return (EINVAL);
2339 }
2340
2341 /*
2342 * Do not allow a process to attach to a prison that is not
2343 * considered to be "alive".
2344 */
2345 if (pr->pr_uref == 0) {
2346 mtx_unlock(&pr->pr_mtx);
2347 sx_sunlock(&allprison_lock);
2348 return (EINVAL);
2349 }
2350
2351 return (do_jail_attach(td, pr));
2352 }
2353
2354 static int
do_jail_attach(struct thread * td,struct prison * pr)2355 do_jail_attach(struct thread *td, struct prison *pr)
2356 {
2357 struct proc *p;
2358 struct ucred *newcred, *oldcred;
2359 int error;
2360
2361 /*
2362 * XXX: Note that there is a slight race here if two threads
2363 * in the same privileged process attempt to attach to two
2364 * different jails at the same time. It is important for
2365 * user processes not to do this, or they might end up with
2366 * a process root from one prison, but attached to the jail
2367 * of another.
2368 */
2369 pr->pr_ref++;
2370 pr->pr_uref++;
2371 mtx_unlock(&pr->pr_mtx);
2372
2373 /* Let modules do whatever they need to prepare for attaching. */
2374 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
2375 if (error) {
2376 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
2377 return (error);
2378 }
2379 sx_sunlock(&allprison_lock);
2380
2381 /*
2382 * Reparent the newly attached process to this jail.
2383 */
2384 p = td->td_proc;
2385 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
2386 if (error)
2387 goto e_revert_osd;
2388
2389 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
2390 if ((error = change_dir(pr->pr_root, td)) != 0)
2391 goto e_unlock;
2392 #ifdef MAC
2393 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
2394 goto e_unlock;
2395 #endif
2396 VOP_UNLOCK(pr->pr_root, 0);
2397 if ((error = pwd_chroot(td, pr->pr_root)))
2398 goto e_revert_osd;
2399
2400 newcred = crget();
2401 PROC_LOCK(p);
2402 oldcred = crcopysafe(p, newcred);
2403 newcred->cr_prison = pr;
2404 proc_set_cred(p, newcred);
2405 setsugid(p);
2406 #ifdef RACCT
2407 racct_proc_ucred_changed(p, oldcred, newcred);
2408 crhold(newcred);
2409 #endif
2410 PROC_UNLOCK(p);
2411 #ifdef RCTL
2412 rctl_proc_ucred_changed(p, newcred);
2413 crfree(newcred);
2414 #endif
2415 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF);
2416 crfree(oldcred);
2417 return (0);
2418
2419 e_unlock:
2420 VOP_UNLOCK(pr->pr_root, 0);
2421 e_revert_osd:
2422 /* Tell modules this thread is still in its old jail after all. */
2423 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td);
2424 prison_deref(pr, PD_DEREF | PD_DEUREF);
2425 return (error);
2426 }
2427
2428
2429 /*
2430 * Returns a locked prison instance, or NULL on failure.
2431 */
2432 struct prison *
prison_find(int prid)2433 prison_find(int prid)
2434 {
2435 struct prison *pr;
2436
2437 sx_assert(&allprison_lock, SX_LOCKED);
2438 TAILQ_FOREACH(pr, &allprison, pr_list) {
2439 if (pr->pr_id == prid) {
2440 mtx_lock(&pr->pr_mtx);
2441 if (pr->pr_ref > 0)
2442 return (pr);
2443 mtx_unlock(&pr->pr_mtx);
2444 }
2445 }
2446 return (NULL);
2447 }
2448
2449 /*
2450 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
2451 */
2452 struct prison *
prison_find_child(struct prison * mypr,int prid)2453 prison_find_child(struct prison *mypr, int prid)
2454 {
2455 struct prison *pr;
2456 int descend;
2457
2458 sx_assert(&allprison_lock, SX_LOCKED);
2459 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2460 if (pr->pr_id == prid) {
2461 mtx_lock(&pr->pr_mtx);
2462 if (pr->pr_ref > 0)
2463 return (pr);
2464 mtx_unlock(&pr->pr_mtx);
2465 }
2466 }
2467 return (NULL);
2468 }
2469
2470 /*
2471 * Look for the name relative to mypr. Returns a locked prison or NULL.
2472 */
2473 struct prison *
prison_find_name(struct prison * mypr,const char * name)2474 prison_find_name(struct prison *mypr, const char *name)
2475 {
2476 struct prison *pr, *deadpr;
2477 size_t mylen;
2478 int descend;
2479
2480 sx_assert(&allprison_lock, SX_LOCKED);
2481 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
2482 again:
2483 deadpr = NULL;
2484 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2485 if (!strcmp(pr->pr_name + mylen, name)) {
2486 mtx_lock(&pr->pr_mtx);
2487 if (pr->pr_ref > 0) {
2488 if (pr->pr_uref > 0)
2489 return (pr);
2490 deadpr = pr;
2491 }
2492 mtx_unlock(&pr->pr_mtx);
2493 }
2494 }
2495 /* There was no valid prison - perhaps there was a dying one. */
2496 if (deadpr != NULL) {
2497 mtx_lock(&deadpr->pr_mtx);
2498 if (deadpr->pr_ref == 0) {
2499 mtx_unlock(&deadpr->pr_mtx);
2500 goto again;
2501 }
2502 }
2503 return (deadpr);
2504 }
2505
2506 /*
2507 * See if a prison has the specific flag set.
2508 */
2509 int
prison_flag(struct ucred * cred,unsigned flag)2510 prison_flag(struct ucred *cred, unsigned flag)
2511 {
2512
2513 /* This is an atomic read, so no locking is necessary. */
2514 return (cred->cr_prison->pr_flags & flag);
2515 }
2516
2517 int
prison_allow(struct ucred * cred,unsigned flag)2518 prison_allow(struct ucred *cred, unsigned flag)
2519 {
2520
2521 /* This is an atomic read, so no locking is necessary. */
2522 return (cred->cr_prison->pr_allow & flag);
2523 }
2524
2525 /*
2526 * Remove a prison reference. If that was the last reference, remove the
2527 * prison itself - but not in this context in case there are locks held.
2528 */
2529 void
prison_free_locked(struct prison * pr)2530 prison_free_locked(struct prison *pr)
2531 {
2532 int ref;
2533
2534 mtx_assert(&pr->pr_mtx, MA_OWNED);
2535 ref = --pr->pr_ref;
2536 mtx_unlock(&pr->pr_mtx);
2537 if (ref == 0)
2538 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2539 }
2540
2541 void
prison_free(struct prison * pr)2542 prison_free(struct prison *pr)
2543 {
2544
2545 mtx_lock(&pr->pr_mtx);
2546 prison_free_locked(pr);
2547 }
2548
2549 /*
2550 * Complete a call to either prison_free or prison_proc_free.
2551 */
2552 static void
prison_complete(void * context,int pending)2553 prison_complete(void *context, int pending)
2554 {
2555 struct prison *pr = context;
2556
2557 sx_xlock(&allprison_lock);
2558 mtx_lock(&pr->pr_mtx);
2559 prison_deref(pr, pr->pr_uref
2560 ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED
2561 : PD_LOCKED | PD_LIST_XLOCKED);
2562 }
2563
2564 /*
2565 * Remove a prison reference (usually). This internal version assumes no
2566 * mutexes are held, except perhaps the prison itself. If there are no more
2567 * references, release and delist the prison. On completion, the prison lock
2568 * and the allprison lock are both unlocked.
2569 */
2570 static void
prison_deref(struct prison * pr,int flags)2571 prison_deref(struct prison *pr, int flags)
2572 {
2573 struct prison *ppr, *tpr;
2574 int ref, lasturef;
2575
2576 if (!(flags & PD_LOCKED))
2577 mtx_lock(&pr->pr_mtx);
2578 for (;;) {
2579 if (flags & PD_DEUREF) {
2580 KASSERT(pr->pr_uref > 0,
2581 ("prison_deref PD_DEUREF on a dead prison (jid=%d)",
2582 pr->pr_id));
2583 pr->pr_uref--;
2584 lasturef = pr->pr_uref == 0;
2585 if (lasturef)
2586 pr->pr_ref++;
2587 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0"));
2588 } else
2589 lasturef = 0;
2590 if (flags & PD_DEREF) {
2591 KASSERT(pr->pr_ref > 0,
2592 ("prison_deref PD_DEREF on a dead prison (jid=%d)",
2593 pr->pr_id));
2594 pr->pr_ref--;
2595 }
2596 ref = pr->pr_ref;
2597 mtx_unlock(&pr->pr_mtx);
2598
2599 /*
2600 * Tell the modules if the last user reference was removed
2601 * (even it sticks around in dying state).
2602 */
2603 if (lasturef) {
2604 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) {
2605 sx_xlock(&allprison_lock);
2606 flags |= PD_LIST_XLOCKED;
2607 }
2608 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
2609 mtx_lock(&pr->pr_mtx);
2610 ref = --pr->pr_ref;
2611 mtx_unlock(&pr->pr_mtx);
2612 }
2613
2614 /* If the prison still has references, nothing else to do. */
2615 if (ref > 0) {
2616 if (flags & PD_LIST_SLOCKED)
2617 sx_sunlock(&allprison_lock);
2618 else if (flags & PD_LIST_XLOCKED)
2619 sx_xunlock(&allprison_lock);
2620 return;
2621 }
2622
2623 if (flags & PD_LIST_SLOCKED) {
2624 if (!sx_try_upgrade(&allprison_lock)) {
2625 sx_sunlock(&allprison_lock);
2626 sx_xlock(&allprison_lock);
2627 }
2628 } else if (!(flags & PD_LIST_XLOCKED))
2629 sx_xlock(&allprison_lock);
2630
2631 TAILQ_REMOVE(&allprison, pr, pr_list);
2632 LIST_REMOVE(pr, pr_sibling);
2633 ppr = pr->pr_parent;
2634 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
2635 tpr->pr_childcount--;
2636 sx_xunlock(&allprison_lock);
2637
2638 #ifdef VIMAGE
2639 if (pr->pr_vnet != ppr->pr_vnet)
2640 vnet_destroy(pr->pr_vnet);
2641 #endif
2642 if (pr->pr_root != NULL)
2643 vrele(pr->pr_root);
2644 mtx_destroy(&pr->pr_mtx);
2645 #ifdef INET
2646 free(pr->pr_ip4, M_PRISON);
2647 #endif
2648 #ifdef INET6
2649 free(pr->pr_ip6, M_PRISON);
2650 #endif
2651 if (pr->pr_cpuset != NULL)
2652 cpuset_rel(pr->pr_cpuset);
2653 osd_jail_exit(pr);
2654 #ifdef RACCT
2655 if (racct_enable)
2656 prison_racct_detach(pr);
2657 #endif
2658 free(pr, M_PRISON);
2659
2660 /* Removing a prison frees a reference on its parent. */
2661 pr = ppr;
2662 mtx_lock(&pr->pr_mtx);
2663 flags = PD_DEREF | PD_DEUREF;
2664 }
2665 }
2666
2667 void
prison_hold_locked(struct prison * pr)2668 prison_hold_locked(struct prison *pr)
2669 {
2670
2671 mtx_assert(&pr->pr_mtx, MA_OWNED);
2672 KASSERT(pr->pr_ref > 0,
2673 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id));
2674 pr->pr_ref++;
2675 }
2676
2677 void
prison_hold(struct prison * pr)2678 prison_hold(struct prison *pr)
2679 {
2680
2681 mtx_lock(&pr->pr_mtx);
2682 prison_hold_locked(pr);
2683 mtx_unlock(&pr->pr_mtx);
2684 }
2685
2686 void
prison_proc_hold(struct prison * pr)2687 prison_proc_hold(struct prison *pr)
2688 {
2689
2690 mtx_lock(&pr->pr_mtx);
2691 KASSERT(pr->pr_uref > 0,
2692 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
2693 pr->pr_uref++;
2694 mtx_unlock(&pr->pr_mtx);
2695 }
2696
2697 void
prison_proc_free(struct prison * pr)2698 prison_proc_free(struct prison *pr)
2699 {
2700
2701 mtx_lock(&pr->pr_mtx);
2702 KASSERT(pr->pr_uref > 0,
2703 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
2704 if (pr->pr_uref > 1)
2705 pr->pr_uref--;
2706 else {
2707 /*
2708 * Don't remove the last user reference in this context, which
2709 * is expected to be a process that is not only locked, but
2710 * also half dead.
2711 */
2712 pr->pr_ref++;
2713 mtx_unlock(&pr->pr_mtx);
2714 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2715 return;
2716 }
2717 mtx_unlock(&pr->pr_mtx);
2718 }
2719
2720 /*
2721 * Check if a jail supports the given address family.
2722 *
2723 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
2724 * if not.
2725 */
2726 int
prison_check_af(struct ucred * cred,int af)2727 prison_check_af(struct ucred *cred, int af)
2728 {
2729 struct prison *pr;
2730 int error;
2731
2732 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2733
2734 pr = cred->cr_prison;
2735 #ifdef VIMAGE
2736 /* Prisons with their own network stack are not limited. */
2737 if (prison_owns_vnet(cred))
2738 return (0);
2739 #endif
2740
2741 error = 0;
2742 switch (af)
2743 {
2744 #ifdef INET
2745 case AF_INET:
2746 if (pr->pr_flags & PR_IP4)
2747 {
2748 mtx_lock(&pr->pr_mtx);
2749 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
2750 error = EAFNOSUPPORT;
2751 mtx_unlock(&pr->pr_mtx);
2752 }
2753 break;
2754 #endif
2755 #ifdef INET6
2756 case AF_INET6:
2757 if (pr->pr_flags & PR_IP6)
2758 {
2759 mtx_lock(&pr->pr_mtx);
2760 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
2761 error = EAFNOSUPPORT;
2762 mtx_unlock(&pr->pr_mtx);
2763 }
2764 break;
2765 #endif
2766 case AF_LOCAL:
2767 case AF_ROUTE:
2768 break;
2769 default:
2770 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
2771 error = EAFNOSUPPORT;
2772 }
2773 return (error);
2774 }
2775
2776 /*
2777 * Check if given address belongs to the jail referenced by cred (wrapper to
2778 * prison_check_ip[46]).
2779 *
2780 * Returns 0 if jail doesn't restrict the address family or if address belongs
2781 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
2782 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
2783 */
2784 int
prison_if(struct ucred * cred,struct sockaddr * sa)2785 prison_if(struct ucred *cred, struct sockaddr *sa)
2786 {
2787 #ifdef INET
2788 struct sockaddr_in *sai;
2789 #endif
2790 #ifdef INET6
2791 struct sockaddr_in6 *sai6;
2792 #endif
2793 int error;
2794
2795 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2796 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
2797
2798 #ifdef VIMAGE
2799 if (prison_owns_vnet(cred))
2800 return (0);
2801 #endif
2802
2803 error = 0;
2804 switch (sa->sa_family)
2805 {
2806 #ifdef INET
2807 case AF_INET:
2808 sai = (struct sockaddr_in *)sa;
2809 error = prison_check_ip4(cred, &sai->sin_addr);
2810 break;
2811 #endif
2812 #ifdef INET6
2813 case AF_INET6:
2814 sai6 = (struct sockaddr_in6 *)sa;
2815 error = prison_check_ip6(cred, &sai6->sin6_addr);
2816 break;
2817 #endif
2818 default:
2819 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
2820 error = EAFNOSUPPORT;
2821 }
2822 return (error);
2823 }
2824
2825 /*
2826 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
2827 */
2828 int
prison_check(struct ucred * cred1,struct ucred * cred2)2829 prison_check(struct ucred *cred1, struct ucred *cred2)
2830 {
2831
2832 return ((cred1->cr_prison == cred2->cr_prison ||
2833 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
2834 }
2835
2836 /*
2837 * Return 1 if p2 is a child of p1, otherwise 0.
2838 */
2839 int
prison_ischild(struct prison * pr1,struct prison * pr2)2840 prison_ischild(struct prison *pr1, struct prison *pr2)
2841 {
2842
2843 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
2844 if (pr1 == pr2)
2845 return (1);
2846 return (0);
2847 }
2848
2849 /*
2850 * Return 1 if the passed credential is in a jail, otherwise 0.
2851 */
2852 int
jailed(struct ucred * cred)2853 jailed(struct ucred *cred)
2854 {
2855
2856 return (cred->cr_prison != &prison0);
2857 }
2858
2859 /*
2860 * Return 1 if the passed credential is in a jail and that jail does not
2861 * have its own virtual network stack, otherwise 0.
2862 */
2863 int
jailed_without_vnet(struct ucred * cred)2864 jailed_without_vnet(struct ucred *cred)
2865 {
2866
2867 if (!jailed(cred))
2868 return (0);
2869 #ifdef VIMAGE
2870 if (prison_owns_vnet(cred))
2871 return (0);
2872 #endif
2873
2874 return (1);
2875 }
2876
2877 /*
2878 * Return the correct hostname (domainname, et al) for the passed credential.
2879 */
2880 void
getcredhostname(struct ucred * cred,char * buf,size_t size)2881 getcredhostname(struct ucred *cred, char *buf, size_t size)
2882 {
2883 struct prison *pr;
2884
2885 /*
2886 * A NULL credential can be used to shortcut to the physical
2887 * system's hostname.
2888 */
2889 pr = (cred != NULL) ? cred->cr_prison : &prison0;
2890 mtx_lock(&pr->pr_mtx);
2891 strlcpy(buf, pr->pr_hostname, size);
2892 mtx_unlock(&pr->pr_mtx);
2893 }
2894
2895 void
getcreddomainname(struct ucred * cred,char * buf,size_t size)2896 getcreddomainname(struct ucred *cred, char *buf, size_t size)
2897 {
2898
2899 mtx_lock(&cred->cr_prison->pr_mtx);
2900 strlcpy(buf, cred->cr_prison->pr_domainname, size);
2901 mtx_unlock(&cred->cr_prison->pr_mtx);
2902 }
2903
2904 void
getcredhostuuid(struct ucred * cred,char * buf,size_t size)2905 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
2906 {
2907
2908 mtx_lock(&cred->cr_prison->pr_mtx);
2909 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
2910 mtx_unlock(&cred->cr_prison->pr_mtx);
2911 }
2912
2913 void
getcredhostid(struct ucred * cred,unsigned long * hostid)2914 getcredhostid(struct ucred *cred, unsigned long *hostid)
2915 {
2916
2917 mtx_lock(&cred->cr_prison->pr_mtx);
2918 *hostid = cred->cr_prison->pr_hostid;
2919 mtx_unlock(&cred->cr_prison->pr_mtx);
2920 }
2921
2922 #ifdef VIMAGE
2923 /*
2924 * Determine whether the prison represented by cred owns
2925 * its vnet rather than having it inherited.
2926 *
2927 * Returns 1 in case the prison owns the vnet, 0 otherwise.
2928 */
2929 int
prison_owns_vnet(struct ucred * cred)2930 prison_owns_vnet(struct ucred *cred)
2931 {
2932
2933 /*
2934 * vnets cannot be added/removed after jail creation,
2935 * so no need to lock here.
2936 */
2937 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
2938 }
2939 #endif
2940
2941 /*
2942 * Determine whether the subject represented by cred can "see"
2943 * status of a mount point.
2944 * Returns: 0 for permitted, ENOENT otherwise.
2945 * XXX: This function should be called cr_canseemount() and should be
2946 * placed in kern_prot.c.
2947 */
2948 int
prison_canseemount(struct ucred * cred,struct mount * mp)2949 prison_canseemount(struct ucred *cred, struct mount *mp)
2950 {
2951 struct prison *pr;
2952 struct statfs *sp;
2953 size_t len;
2954
2955 pr = cred->cr_prison;
2956 if (pr->pr_enforce_statfs == 0)
2957 return (0);
2958 if (pr->pr_root->v_mount == mp)
2959 return (0);
2960 if (pr->pr_enforce_statfs == 2)
2961 return (ENOENT);
2962 /*
2963 * If jail's chroot directory is set to "/" we should be able to see
2964 * all mount-points from inside a jail.
2965 * This is ugly check, but this is the only situation when jail's
2966 * directory ends with '/'.
2967 */
2968 if (strcmp(pr->pr_path, "/") == 0)
2969 return (0);
2970 len = strlen(pr->pr_path);
2971 sp = &mp->mnt_stat;
2972 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
2973 return (ENOENT);
2974 /*
2975 * Be sure that we don't have situation where jail's root directory
2976 * is "/some/path" and mount point is "/some/pathpath".
2977 */
2978 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
2979 return (ENOENT);
2980 return (0);
2981 }
2982
2983 void
prison_enforce_statfs(struct ucred * cred,struct mount * mp,struct statfs * sp)2984 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
2985 {
2986 char jpath[MAXPATHLEN];
2987 struct prison *pr;
2988 size_t len;
2989
2990 pr = cred->cr_prison;
2991 if (pr->pr_enforce_statfs == 0)
2992 return;
2993 if (prison_canseemount(cred, mp) != 0) {
2994 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
2995 strlcpy(sp->f_mntonname, "[restricted]",
2996 sizeof(sp->f_mntonname));
2997 return;
2998 }
2999 if (pr->pr_root->v_mount == mp) {
3000 /*
3001 * Clear current buffer data, so we are sure nothing from
3002 * the valid path left there.
3003 */
3004 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3005 *sp->f_mntonname = '/';
3006 return;
3007 }
3008 /*
3009 * If jail's chroot directory is set to "/" we should be able to see
3010 * all mount-points from inside a jail.
3011 */
3012 if (strcmp(pr->pr_path, "/") == 0)
3013 return;
3014 len = strlen(pr->pr_path);
3015 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
3016 /*
3017 * Clear current buffer data, so we are sure nothing from
3018 * the valid path left there.
3019 */
3020 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3021 if (*jpath == '\0') {
3022 /* Should never happen. */
3023 *sp->f_mntonname = '/';
3024 } else {
3025 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
3026 }
3027 }
3028
3029 /*
3030 * Check with permission for a specific privilege is granted within jail. We
3031 * have a specific list of accepted privileges; the rest are denied.
3032 */
3033 int
prison_priv_check(struct ucred * cred,int priv)3034 prison_priv_check(struct ucred *cred, int priv)
3035 {
3036
3037 if (!jailed(cred))
3038 return (0);
3039
3040 #ifdef VIMAGE
3041 /*
3042 * Privileges specific to prisons with a virtual network stack.
3043 * There might be a duplicate entry here in case the privilege
3044 * is only granted conditionally in the legacy jail case.
3045 */
3046 switch (priv) {
3047 #ifdef notyet
3048 /*
3049 * NFS-specific privileges.
3050 */
3051 case PRIV_NFS_DAEMON:
3052 case PRIV_NFS_LOCKD:
3053 #endif
3054 /*
3055 * Network stack privileges.
3056 */
3057 case PRIV_NET_BRIDGE:
3058 case PRIV_NET_GRE:
3059 case PRIV_NET_BPF:
3060 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
3061 case PRIV_NET_ROUTE:
3062 case PRIV_NET_TAP:
3063 case PRIV_NET_SETIFMTU:
3064 case PRIV_NET_SETIFFLAGS:
3065 case PRIV_NET_SETIFCAP:
3066 case PRIV_NET_SETIFDESCR:
3067 case PRIV_NET_SETIFNAME :
3068 case PRIV_NET_SETIFMETRIC:
3069 case PRIV_NET_SETIFPHYS:
3070 case PRIV_NET_SETIFMAC:
3071 case PRIV_NET_SETLANPCP:
3072 case PRIV_NET_ADDMULTI:
3073 case PRIV_NET_DELMULTI:
3074 case PRIV_NET_HWIOCTL:
3075 case PRIV_NET_SETLLADDR:
3076 case PRIV_NET_ADDIFGROUP:
3077 case PRIV_NET_DELIFGROUP:
3078 case PRIV_NET_IFCREATE:
3079 case PRIV_NET_IFDESTROY:
3080 case PRIV_NET_ADDIFADDR:
3081 case PRIV_NET_DELIFADDR:
3082 case PRIV_NET_LAGG:
3083 case PRIV_NET_GIF:
3084 case PRIV_NET_SETIFVNET:
3085 case PRIV_NET_SETIFFIB:
3086
3087 /*
3088 * 802.11-related privileges.
3089 */
3090 case PRIV_NET80211_GETKEY:
3091 #ifdef notyet
3092 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */
3093 #endif
3094
3095 #ifdef notyet
3096 /*
3097 * ATM privileges.
3098 */
3099 case PRIV_NETATM_CFG:
3100 case PRIV_NETATM_ADD:
3101 case PRIV_NETATM_DEL:
3102 case PRIV_NETATM_SET:
3103
3104 /*
3105 * Bluetooth privileges.
3106 */
3107 case PRIV_NETBLUETOOTH_RAW:
3108 #endif
3109
3110 /*
3111 * Netgraph and netgraph module privileges.
3112 */
3113 case PRIV_NETGRAPH_CONTROL:
3114 #ifdef notyet
3115 case PRIV_NETGRAPH_TTY:
3116 #endif
3117
3118 /*
3119 * IPv4 and IPv6 privileges.
3120 */
3121 case PRIV_NETINET_IPFW:
3122 case PRIV_NETINET_DIVERT:
3123 case PRIV_NETINET_PF:
3124 case PRIV_NETINET_DUMMYNET:
3125 case PRIV_NETINET_CARP:
3126 case PRIV_NETINET_MROUTE:
3127 case PRIV_NETINET_RAW:
3128 case PRIV_NETINET_ADDRCTRL6:
3129 case PRIV_NETINET_ND6:
3130 case PRIV_NETINET_SCOPE6:
3131 case PRIV_NETINET_ALIFETIME6:
3132 case PRIV_NETINET_IPSEC:
3133 case PRIV_NETINET_BINDANY:
3134
3135 #ifdef notyet
3136 /*
3137 * NCP privileges.
3138 */
3139 case PRIV_NETNCP:
3140
3141 /*
3142 * SMB privileges.
3143 */
3144 case PRIV_NETSMB:
3145 #endif
3146
3147 /*
3148 * No default: or deny here.
3149 * In case of no permit fall through to next switch().
3150 */
3151 if (cred->cr_prison->pr_flags & PR_VNET)
3152 return (0);
3153 }
3154 #endif /* VIMAGE */
3155
3156 switch (priv) {
3157
3158 /*
3159 * Allow ktrace privileges for root in jail.
3160 */
3161 case PRIV_KTRACE:
3162
3163 #if 0
3164 /*
3165 * Allow jailed processes to configure audit identity and
3166 * submit audit records (login, etc). In the future we may
3167 * want to further refine the relationship between audit and
3168 * jail.
3169 */
3170 case PRIV_AUDIT_GETAUDIT:
3171 case PRIV_AUDIT_SETAUDIT:
3172 case PRIV_AUDIT_SUBMIT:
3173 #endif
3174
3175 /*
3176 * Allow jailed processes to manipulate process UNIX
3177 * credentials in any way they see fit.
3178 */
3179 case PRIV_CRED_SETUID:
3180 case PRIV_CRED_SETEUID:
3181 case PRIV_CRED_SETGID:
3182 case PRIV_CRED_SETEGID:
3183 case PRIV_CRED_SETGROUPS:
3184 case PRIV_CRED_SETREUID:
3185 case PRIV_CRED_SETREGID:
3186 case PRIV_CRED_SETRESUID:
3187 case PRIV_CRED_SETRESGID:
3188
3189 /*
3190 * Jail implements visibility constraints already, so allow
3191 * jailed root to override uid/gid-based constraints.
3192 */
3193 case PRIV_SEEOTHERGIDS:
3194 case PRIV_SEEOTHERUIDS:
3195
3196 /*
3197 * Jail implements inter-process debugging limits already, so
3198 * allow jailed root various debugging privileges.
3199 */
3200 case PRIV_DEBUG_DIFFCRED:
3201 case PRIV_DEBUG_SUGID:
3202 case PRIV_DEBUG_UNPRIV:
3203
3204 /*
3205 * Allow jail to set various resource limits and login
3206 * properties, and for now, exceed process resource limits.
3207 */
3208 case PRIV_PROC_LIMIT:
3209 case PRIV_PROC_SETLOGIN:
3210 case PRIV_PROC_SETRLIMIT:
3211
3212 /*
3213 * System V and POSIX IPC privileges are granted in jail.
3214 */
3215 case PRIV_IPC_READ:
3216 case PRIV_IPC_WRITE:
3217 case PRIV_IPC_ADMIN:
3218 case PRIV_IPC_MSGSIZE:
3219 case PRIV_MQ_ADMIN:
3220
3221 /*
3222 * Jail operations within a jail work on child jails.
3223 */
3224 case PRIV_JAIL_ATTACH:
3225 case PRIV_JAIL_SET:
3226 case PRIV_JAIL_REMOVE:
3227
3228 /*
3229 * Jail implements its own inter-process limits, so allow
3230 * root processes in jail to change scheduling on other
3231 * processes in the same jail. Likewise for signalling.
3232 */
3233 case PRIV_SCHED_DIFFCRED:
3234 case PRIV_SCHED_CPUSET:
3235 case PRIV_SIGNAL_DIFFCRED:
3236 case PRIV_SIGNAL_SUGID:
3237
3238 /*
3239 * Allow jailed processes to write to sysctls marked as jail
3240 * writable.
3241 */
3242 case PRIV_SYSCTL_WRITEJAIL:
3243
3244 /*
3245 * Allow root in jail to manage a variety of quota
3246 * properties. These should likely be conditional on a
3247 * configuration option.
3248 */
3249 case PRIV_VFS_GETQUOTA:
3250 case PRIV_VFS_SETQUOTA:
3251
3252 /*
3253 * Since Jail relies on chroot() to implement file system
3254 * protections, grant many VFS privileges to root in jail.
3255 * Be careful to exclude mount-related and NFS-related
3256 * privileges.
3257 */
3258 case PRIV_VFS_READ:
3259 case PRIV_VFS_WRITE:
3260 case PRIV_VFS_ADMIN:
3261 case PRIV_VFS_EXEC:
3262 case PRIV_VFS_LOOKUP:
3263 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
3264 case PRIV_VFS_CHFLAGS_DEV:
3265 case PRIV_VFS_CHOWN:
3266 case PRIV_VFS_CHROOT:
3267 case PRIV_VFS_RETAINSUGID:
3268 case PRIV_VFS_FCHROOT:
3269 case PRIV_VFS_LINK:
3270 case PRIV_VFS_SETGID:
3271 case PRIV_VFS_STAT:
3272 case PRIV_VFS_STICKYFILE:
3273
3274 /*
3275 * As in the non-jail case, non-root users are expected to be
3276 * able to read kernel/phyiscal memory (provided /dev/[k]mem
3277 * exists in the jail and they have permission to access it).
3278 */
3279 case PRIV_KMEM_READ:
3280 return (0);
3281
3282 /*
3283 * Depending on the global setting, allow privilege of
3284 * setting system flags.
3285 */
3286 case PRIV_VFS_SYSFLAGS:
3287 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
3288 return (0);
3289 else
3290 return (EPERM);
3291
3292 /*
3293 * Depending on the global setting, allow privilege of
3294 * mounting/unmounting file systems.
3295 */
3296 case PRIV_VFS_MOUNT:
3297 case PRIV_VFS_UNMOUNT:
3298 case PRIV_VFS_MOUNT_NONUSER:
3299 case PRIV_VFS_MOUNT_OWNER:
3300 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT &&
3301 cred->cr_prison->pr_enforce_statfs < 2)
3302 return (0);
3303 else
3304 return (EPERM);
3305
3306 /*
3307 * Conditionnaly allow locking (unlocking) physical pages
3308 * in memory.
3309 */
3310 case PRIV_VM_MLOCK:
3311 case PRIV_VM_MUNLOCK:
3312 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK)
3313 return (0);
3314 else
3315 return (EPERM);
3316
3317 /*
3318 * Conditionally allow jailed root to bind reserved ports.
3319 */
3320 case PRIV_NETINET_RESERVEDPORT:
3321 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS)
3322 return (0);
3323 else
3324 return (EPERM);
3325
3326 /*
3327 * Allow jailed root to reuse in-use ports.
3328 */
3329 case PRIV_NETINET_REUSEPORT:
3330 return (0);
3331
3332 /*
3333 * Allow jailed root to set certain IPv4/6 (option) headers.
3334 */
3335 case PRIV_NETINET_SETHDROPTS:
3336 return (0);
3337
3338 /*
3339 * Conditionally allow creating raw sockets in jail.
3340 */
3341 case PRIV_NETINET_RAW:
3342 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
3343 return (0);
3344 else
3345 return (EPERM);
3346
3347 /*
3348 * Since jail implements its own visibility limits on netstat
3349 * sysctls, allow getcred. This allows identd to work in
3350 * jail.
3351 */
3352 case PRIV_NETINET_GETCRED:
3353 return (0);
3354
3355 /*
3356 * Allow jailed root to set loginclass.
3357 */
3358 case PRIV_PROC_SETLOGINCLASS:
3359 return (0);
3360
3361 /*
3362 * Do not allow a process inside a jail to read the kernel
3363 * message buffer unless explicitly permitted.
3364 */
3365 case PRIV_MSGBUF:
3366 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF)
3367 return (0);
3368 return (EPERM);
3369
3370 default:
3371 /*
3372 * In all remaining cases, deny the privilege request. This
3373 * includes almost all network privileges, many system
3374 * configuration privileges.
3375 */
3376 return (EPERM);
3377 }
3378 }
3379
3380 /*
3381 * Return the part of pr2's name that is relative to pr1, or the whole name
3382 * if it does not directly follow.
3383 */
3384
3385 char *
prison_name(struct prison * pr1,struct prison * pr2)3386 prison_name(struct prison *pr1, struct prison *pr2)
3387 {
3388 char *name;
3389
3390 /* Jails see themselves as "0" (if they see themselves at all). */
3391 if (pr1 == pr2)
3392 return "0";
3393 name = pr2->pr_name;
3394 if (prison_ischild(pr1, pr2)) {
3395 /*
3396 * pr1 isn't locked (and allprison_lock may not be either)
3397 * so its length can't be counted on. But the number of dots
3398 * can be counted on - and counted.
3399 */
3400 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
3401 name = strchr(name, '.') + 1;
3402 }
3403 return (name);
3404 }
3405
3406 /*
3407 * Return the part of pr2's path that is relative to pr1, or the whole path
3408 * if it does not directly follow.
3409 */
3410 static char *
prison_path(struct prison * pr1,struct prison * pr2)3411 prison_path(struct prison *pr1, struct prison *pr2)
3412 {
3413 char *path1, *path2;
3414 int len1;
3415
3416 path1 = pr1->pr_path;
3417 path2 = pr2->pr_path;
3418 if (!strcmp(path1, "/"))
3419 return (path2);
3420 len1 = strlen(path1);
3421 if (strncmp(path1, path2, len1))
3422 return (path2);
3423 if (path2[len1] == '\0')
3424 return "/";
3425 if (path2[len1] == '/')
3426 return (path2 + len1);
3427 return (path2);
3428 }
3429
3430
3431 /*
3432 * Jail-related sysctls.
3433 */
3434 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
3435 "Jails");
3436
3437 static int
sysctl_jail_list(SYSCTL_HANDLER_ARGS)3438 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
3439 {
3440 struct xprison *xp;
3441 struct prison *pr, *cpr;
3442 #ifdef INET
3443 struct in_addr *ip4 = NULL;
3444 int ip4s = 0;
3445 #endif
3446 #ifdef INET6
3447 struct in6_addr *ip6 = NULL;
3448 int ip6s = 0;
3449 #endif
3450 int descend, error;
3451
3452 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
3453 pr = req->td->td_ucred->cr_prison;
3454 error = 0;
3455 sx_slock(&allprison_lock);
3456 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
3457 #if defined(INET) || defined(INET6)
3458 again:
3459 #endif
3460 mtx_lock(&cpr->pr_mtx);
3461 #ifdef INET
3462 if (cpr->pr_ip4s > 0) {
3463 if (ip4s < cpr->pr_ip4s) {
3464 ip4s = cpr->pr_ip4s;
3465 mtx_unlock(&cpr->pr_mtx);
3466 ip4 = realloc(ip4, ip4s *
3467 sizeof(struct in_addr), M_TEMP, M_WAITOK);
3468 goto again;
3469 }
3470 bcopy(cpr->pr_ip4, ip4,
3471 cpr->pr_ip4s * sizeof(struct in_addr));
3472 }
3473 #endif
3474 #ifdef INET6
3475 if (cpr->pr_ip6s > 0) {
3476 if (ip6s < cpr->pr_ip6s) {
3477 ip6s = cpr->pr_ip6s;
3478 mtx_unlock(&cpr->pr_mtx);
3479 ip6 = realloc(ip6, ip6s *
3480 sizeof(struct in6_addr), M_TEMP, M_WAITOK);
3481 goto again;
3482 }
3483 bcopy(cpr->pr_ip6, ip6,
3484 cpr->pr_ip6s * sizeof(struct in6_addr));
3485 }
3486 #endif
3487 if (cpr->pr_ref == 0) {
3488 mtx_unlock(&cpr->pr_mtx);
3489 continue;
3490 }
3491 bzero(xp, sizeof(*xp));
3492 xp->pr_version = XPRISON_VERSION;
3493 xp->pr_id = cpr->pr_id;
3494 xp->pr_state = cpr->pr_uref > 0
3495 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
3496 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
3497 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
3498 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
3499 #ifdef INET
3500 xp->pr_ip4s = cpr->pr_ip4s;
3501 #endif
3502 #ifdef INET6
3503 xp->pr_ip6s = cpr->pr_ip6s;
3504 #endif
3505 mtx_unlock(&cpr->pr_mtx);
3506 error = SYSCTL_OUT(req, xp, sizeof(*xp));
3507 if (error)
3508 break;
3509 #ifdef INET
3510 if (xp->pr_ip4s > 0) {
3511 error = SYSCTL_OUT(req, ip4,
3512 xp->pr_ip4s * sizeof(struct in_addr));
3513 if (error)
3514 break;
3515 }
3516 #endif
3517 #ifdef INET6
3518 if (xp->pr_ip6s > 0) {
3519 error = SYSCTL_OUT(req, ip6,
3520 xp->pr_ip6s * sizeof(struct in6_addr));
3521 if (error)
3522 break;
3523 }
3524 #endif
3525 }
3526 sx_sunlock(&allprison_lock);
3527 free(xp, M_TEMP);
3528 #ifdef INET
3529 free(ip4, M_TEMP);
3530 #endif
3531 #ifdef INET6
3532 free(ip6, M_TEMP);
3533 #endif
3534 return (error);
3535 }
3536
3537 SYSCTL_OID(_security_jail, OID_AUTO, list,
3538 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
3539 sysctl_jail_list, "S", "List of active jails");
3540
3541 static int
sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)3542 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
3543 {
3544 int error, injail;
3545
3546 injail = jailed(req->td->td_ucred);
3547 error = SYSCTL_OUT(req, &injail, sizeof(injail));
3548
3549 return (error);
3550 }
3551
3552 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
3553 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
3554 sysctl_jail_jailed, "I", "Process in jail?");
3555
3556 static int
sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)3557 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
3558 {
3559 int error, havevnet;
3560 #ifdef VIMAGE
3561 struct ucred *cred = req->td->td_ucred;
3562
3563 havevnet = jailed(cred) && prison_owns_vnet(cred);
3564 #else
3565 havevnet = 0;
3566 #endif
3567 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
3568
3569 return (error);
3570 }
3571
3572 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
3573 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
3574 sysctl_jail_vnet, "I", "Jail owns vnet?");
3575
3576 #if defined(INET) || defined(INET6)
3577 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
3578 &jail_max_af_ips, 0,
3579 "Number of IP addresses a jail may have at most per address family (deprecated)");
3580 #endif
3581
3582 /*
3583 * Default parameters for jail(2) compatibility. For historical reasons,
3584 * the sysctl names have varying similarity to the parameter names. Prisons
3585 * just see their own parameters, and can't change them.
3586 */
3587 static int
sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)3588 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
3589 {
3590 struct prison *pr;
3591 int allow, error, i;
3592
3593 pr = req->td->td_ucred->cr_prison;
3594 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
3595
3596 /* Get the current flag value, and convert it to a boolean. */
3597 i = (allow & arg2) ? 1 : 0;
3598 if (arg1 != NULL)
3599 i = !i;
3600 error = sysctl_handle_int(oidp, &i, 0, req);
3601 if (error || !req->newptr)
3602 return (error);
3603 i = i ? arg2 : 0;
3604 if (arg1 != NULL)
3605 i ^= arg2;
3606 /*
3607 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
3608 * for writing.
3609 */
3610 mtx_lock(&prison0.pr_mtx);
3611 jail_default_allow = (jail_default_allow & ~arg2) | i;
3612 mtx_unlock(&prison0.pr_mtx);
3613 return (0);
3614 }
3615
3616 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
3617 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3618 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
3619 "Processes in jail can set their hostnames (deprecated)");
3620 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
3621 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3622 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
3623 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)");
3624 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
3625 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3626 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
3627 "Processes in jail can use System V IPC primitives (deprecated)");
3628 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
3629 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3630 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
3631 "Prison root can create raw sockets (deprecated)");
3632 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
3633 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3634 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
3635 "Processes in jail can alter system file flags (deprecated)");
3636 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
3637 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3638 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
3639 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)");
3640
3641 static int
sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)3642 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
3643 {
3644 struct prison *pr;
3645 int level, error;
3646
3647 pr = req->td->td_ucred->cr_prison;
3648 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
3649 error = sysctl_handle_int(oidp, &level, 0, req);
3650 if (error || !req->newptr)
3651 return (error);
3652 *(int *)arg1 = level;
3653 return (0);
3654 }
3655
3656 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
3657 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3658 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
3659 sysctl_jail_default_level, "I",
3660 "Processes in jail cannot see all mounted file systems (deprecated)");
3661
3662 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
3663 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
3664 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
3665 sysctl_jail_default_level, "I",
3666 "Ruleset for the devfs filesystem in jail (deprecated)");
3667
3668 /*
3669 * Nodes to describe jail parameters. Maximum length of string parameters
3670 * is returned in the string itself, and the other parameters exist merely
3671 * to make themselves and their types known.
3672 */
3673 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0,
3674 "Jail parameters");
3675
3676 int
sysctl_jail_param(SYSCTL_HANDLER_ARGS)3677 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
3678 {
3679 int i;
3680 long l;
3681 size_t s;
3682 char numbuf[12];
3683
3684 switch (oidp->oid_kind & CTLTYPE)
3685 {
3686 case CTLTYPE_LONG:
3687 case CTLTYPE_ULONG:
3688 l = 0;
3689 #ifdef SCTL_MASK32
3690 if (!(req->flags & SCTL_MASK32))
3691 #endif
3692 return (SYSCTL_OUT(req, &l, sizeof(l)));
3693 case CTLTYPE_INT:
3694 case CTLTYPE_UINT:
3695 i = 0;
3696 return (SYSCTL_OUT(req, &i, sizeof(i)));
3697 case CTLTYPE_STRING:
3698 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
3699 return
3700 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
3701 case CTLTYPE_STRUCT:
3702 s = (size_t)arg2;
3703 return (SYSCTL_OUT(req, &s, sizeof(s)));
3704 }
3705 return (0);
3706 }
3707
3708 /*
3709 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at
3710 * jail creation time but cannot be changed in an existing jail.
3711 */
3712 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
3713 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
3714 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
3715 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
3716 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
3717 "I", "Jail secure level");
3718 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I",
3719 "Jail value for kern.osreldate and uname -K");
3720 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN,
3721 "Jail value for kern.osrelease and uname -r");
3722 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
3723 "I", "Jail cannot see all mounted file systems");
3724 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
3725 "I", "Ruleset for in-jail devfs mounts");
3726 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
3727 "B", "Jail persistence");
3728 #ifdef VIMAGE
3729 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
3730 "E,jailsys", "Virtual network stack");
3731 #endif
3732 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
3733 "B", "Jail is in the process of shutting down");
3734
3735 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
3736 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
3737 "I", "Current number of child jails");
3738 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
3739 "I", "Maximum number of child jails");
3740
3741 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
3742 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
3743 "Jail hostname");
3744 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
3745 "Jail NIS domainname");
3746 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
3747 "Jail host UUID");
3748 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
3749 "LU", "Jail host ID");
3750
3751 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
3752 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
3753
3754 #ifdef INET
3755 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
3756 "Jail IPv4 address virtualization");
3757 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
3758 "S,in_addr,a", "Jail IPv4 addresses");
3759 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
3760 "B", "Do (not) use IPv4 source address selection rather than the "
3761 "primary jail IPv4 address.");
3762 #endif
3763 #ifdef INET6
3764 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
3765 "Jail IPv6 address virtualization");
3766 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
3767 "S,in6_addr,a", "Jail IPv6 addresses");
3768 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
3769 "B", "Do (not) use IPv6 source address selection rather than the "
3770 "primary jail IPv6 address.");
3771 #endif
3772
3773 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
3774 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
3775 "B", "Jail may set hostname");
3776 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
3777 "B", "Jail may use SYSV IPC");
3778 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
3779 "B", "Jail may create raw sockets");
3780 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
3781 "B", "Jail may alter system file flags");
3782 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
3783 "B", "Jail may set file quotas");
3784 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
3785 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
3786 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW,
3787 "B", "Jail may lock (unlock) physical pages in memory");
3788 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW,
3789 "B", "Jail may bind sockets to reserved ports");
3790 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW,
3791 "B", "Jail may read the kernel message buffer");
3792
3793 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
3794 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
3795 "B", "Jail may mount/unmount jail-friendly file systems in general");
3796
3797 /*
3798 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return
3799 * its associated bit in the pr_allow bitmask, or zero if the parameter was
3800 * not created.
3801 */
3802 unsigned
prison_add_allow(const char * prefix,const char * name,const char * prefix_descr,const char * descr)3803 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr,
3804 const char *descr)
3805 {
3806 struct bool_flags *bf;
3807 struct sysctl_oid *parent;
3808 char *allow_name, *allow_noname, *allowed;
3809 #ifndef NO_SYSCTL_DESCR
3810 char *descr_deprecated;
3811 #endif
3812 unsigned allow_flag;
3813
3814 if (prefix
3815 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name)
3816 < 0 ||
3817 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name)
3818 < 0
3819 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 ||
3820 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) {
3821 free(allow_name, M_PRISON);
3822 return 0;
3823 }
3824
3825 /*
3826 * See if this parameter has already beed added, i.e. a module was
3827 * previously loaded/unloaded.
3828 */
3829 mtx_lock(&prison0.pr_mtx);
3830 for (bf = pr_flag_allow;
3831 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0;
3832 bf++) {
3833 if (strcmp(bf->name, allow_name) == 0) {
3834 allow_flag = bf->flag;
3835 goto no_add;
3836 }
3837 }
3838
3839 /*
3840 * Find a free bit in prison0's pr_allow, failing if there are none
3841 * (which shouldn't happen as long as we keep track of how many
3842 * potential dynamic flags exist).
3843 */
3844 for (allow_flag = 1;; allow_flag <<= 1) {
3845 if (allow_flag == 0)
3846 goto no_add;
3847 if ((prison0.pr_allow & allow_flag) == 0)
3848 break;
3849 }
3850
3851 /*
3852 * Note the parameter in the next open slot in pr_flag_allow.
3853 * Set the flag last so code that checks pr_flag_allow can do so
3854 * without locking.
3855 */
3856 for (bf = pr_flag_allow; bf->flag != 0; bf++)
3857 if (bf == pr_flag_allow + nitems(pr_flag_allow)) {
3858 /* This should never happen, but is not fatal. */
3859 allow_flag = 0;
3860 goto no_add;
3861 }
3862 prison0.pr_allow |= allow_flag;
3863 bf->name = allow_name;
3864 bf->noname = allow_noname;
3865 bf->flag = allow_flag;
3866 mtx_unlock(&prison0.pr_mtx);
3867
3868 /*
3869 * Create sysctls for the paramter, and the back-compat global
3870 * permission.
3871 */
3872 parent = prefix
3873 ? SYSCTL_ADD_NODE(NULL,
3874 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow),
3875 OID_AUTO, prefix, 0, 0, prefix_descr)
3876 : &sysctl___security_jail_param_allow;
3877 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO,
3878 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
3879 NULL, 0, sysctl_jail_param, "B", descr);
3880 if ((prefix
3881 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name)
3882 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) {
3883 #ifndef NO_SYSCTL_DESCR
3884 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)",
3885 descr);
3886 #endif
3887 (void)SYSCTL_ADD_PROC(NULL,
3888 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed,
3889 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag,
3890 sysctl_jail_default_allow, "I", descr_deprecated);
3891 #ifndef NO_SYSCTL_DESCR
3892 free(descr_deprecated, M_TEMP);
3893 #endif
3894 free(allowed, M_TEMP);
3895 }
3896 return allow_flag;
3897
3898 no_add:
3899 mtx_unlock(&prison0.pr_mtx);
3900 free(allow_name, M_PRISON);
3901 free(allow_noname, M_PRISON);
3902 return allow_flag;
3903 }
3904
3905 /*
3906 * The VFS system will register jail-aware filesystems here. They each get
3907 * a parameter allow.mount.xxxfs and a flag to check when a jailed user
3908 * attempts to mount.
3909 */
3910 void
prison_add_vfs(struct vfsconf * vfsp)3911 prison_add_vfs(struct vfsconf *vfsp)
3912 {
3913 #ifdef NO_SYSCTL_DESCR
3914
3915 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
3916 NULL, NULL);
3917 #else
3918 char *descr;
3919
3920 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system",
3921 vfsp->vfc_name);
3922 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
3923 NULL, descr);
3924 free(descr, M_TEMP);
3925 #endif
3926 }
3927
3928 #ifdef RACCT
3929 void
prison_racct_foreach(void (* callback)(struct racct * racct,void * arg2,void * arg3),void (* pre)(void),void (* post)(void),void * arg2,void * arg3)3930 prison_racct_foreach(void (*callback)(struct racct *racct,
3931 void *arg2, void *arg3), void (*pre)(void), void (*post)(void),
3932 void *arg2, void *arg3)
3933 {
3934 struct prison_racct *prr;
3935
3936 ASSERT_RACCT_ENABLED();
3937
3938 sx_slock(&allprison_lock);
3939 if (pre != NULL)
3940 (pre)();
3941 LIST_FOREACH(prr, &allprison_racct, prr_next)
3942 (callback)(prr->prr_racct, arg2, arg3);
3943 if (post != NULL)
3944 (post)();
3945 sx_sunlock(&allprison_lock);
3946 }
3947
3948 static struct prison_racct *
prison_racct_find_locked(const char * name)3949 prison_racct_find_locked(const char *name)
3950 {
3951 struct prison_racct *prr;
3952
3953 ASSERT_RACCT_ENABLED();
3954 sx_assert(&allprison_lock, SA_XLOCKED);
3955
3956 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
3957 return (NULL);
3958
3959 LIST_FOREACH(prr, &allprison_racct, prr_next) {
3960 if (strcmp(name, prr->prr_name) != 0)
3961 continue;
3962
3963 /* Found prison_racct with a matching name? */
3964 prison_racct_hold(prr);
3965 return (prr);
3966 }
3967
3968 /* Add new prison_racct. */
3969 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
3970 racct_create(&prr->prr_racct);
3971
3972 strcpy(prr->prr_name, name);
3973 refcount_init(&prr->prr_refcount, 1);
3974 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
3975
3976 return (prr);
3977 }
3978
3979 struct prison_racct *
prison_racct_find(const char * name)3980 prison_racct_find(const char *name)
3981 {
3982 struct prison_racct *prr;
3983
3984 ASSERT_RACCT_ENABLED();
3985
3986 sx_xlock(&allprison_lock);
3987 prr = prison_racct_find_locked(name);
3988 sx_xunlock(&allprison_lock);
3989 return (prr);
3990 }
3991
3992 void
prison_racct_hold(struct prison_racct * prr)3993 prison_racct_hold(struct prison_racct *prr)
3994 {
3995
3996 ASSERT_RACCT_ENABLED();
3997
3998 refcount_acquire(&prr->prr_refcount);
3999 }
4000
4001 static void
prison_racct_free_locked(struct prison_racct * prr)4002 prison_racct_free_locked(struct prison_racct *prr)
4003 {
4004
4005 ASSERT_RACCT_ENABLED();
4006 sx_assert(&allprison_lock, SA_XLOCKED);
4007
4008 if (refcount_release(&prr->prr_refcount)) {
4009 racct_destroy(&prr->prr_racct);
4010 LIST_REMOVE(prr, prr_next);
4011 free(prr, M_PRISON_RACCT);
4012 }
4013 }
4014
4015 void
prison_racct_free(struct prison_racct * prr)4016 prison_racct_free(struct prison_racct *prr)
4017 {
4018 int old;
4019
4020 ASSERT_RACCT_ENABLED();
4021 sx_assert(&allprison_lock, SA_UNLOCKED);
4022
4023 old = prr->prr_refcount;
4024 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1))
4025 return;
4026
4027 sx_xlock(&allprison_lock);
4028 prison_racct_free_locked(prr);
4029 sx_xunlock(&allprison_lock);
4030 }
4031
4032 static void
prison_racct_attach(struct prison * pr)4033 prison_racct_attach(struct prison *pr)
4034 {
4035 struct prison_racct *prr;
4036
4037 ASSERT_RACCT_ENABLED();
4038 sx_assert(&allprison_lock, SA_XLOCKED);
4039
4040 prr = prison_racct_find_locked(pr->pr_name);
4041 KASSERT(prr != NULL, ("cannot find prison_racct"));
4042
4043 pr->pr_prison_racct = prr;
4044 }
4045
4046 /*
4047 * Handle jail renaming. From the racct point of view, renaming means
4048 * moving from one prison_racct to another.
4049 */
4050 static void
prison_racct_modify(struct prison * pr)4051 prison_racct_modify(struct prison *pr)
4052 {
4053 #ifdef RCTL
4054 struct proc *p;
4055 struct ucred *cred;
4056 #endif
4057 struct prison_racct *oldprr;
4058
4059 ASSERT_RACCT_ENABLED();
4060
4061 sx_slock(&allproc_lock);
4062 sx_xlock(&allprison_lock);
4063
4064 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
4065 sx_xunlock(&allprison_lock);
4066 sx_sunlock(&allproc_lock);
4067 return;
4068 }
4069
4070 oldprr = pr->pr_prison_racct;
4071 pr->pr_prison_racct = NULL;
4072
4073 prison_racct_attach(pr);
4074
4075 /*
4076 * Move resource utilisation records.
4077 */
4078 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
4079
4080 #ifdef RCTL
4081 /*
4082 * Force rctl to reattach rules to processes.
4083 */
4084 FOREACH_PROC_IN_SYSTEM(p) {
4085 PROC_LOCK(p);
4086 cred = crhold(p->p_ucred);
4087 PROC_UNLOCK(p);
4088 rctl_proc_ucred_changed(p, cred);
4089 crfree(cred);
4090 }
4091 #endif
4092
4093 sx_sunlock(&allproc_lock);
4094 prison_racct_free_locked(oldprr);
4095 sx_xunlock(&allprison_lock);
4096 }
4097
4098 static void
prison_racct_detach(struct prison * pr)4099 prison_racct_detach(struct prison *pr)
4100 {
4101
4102 ASSERT_RACCT_ENABLED();
4103 sx_assert(&allprison_lock, SA_UNLOCKED);
4104
4105 if (pr->pr_prison_racct == NULL)
4106 return;
4107 prison_racct_free(pr->pr_prison_racct);
4108 pr->pr_prison_racct = NULL;
4109 }
4110 #endif /* RACCT */
4111
4112 #ifdef DDB
4113
4114 static void
db_show_prison(struct prison * pr)4115 db_show_prison(struct prison *pr)
4116 {
4117 struct bool_flags *bf;
4118 struct jailsys_flags *jsf;
4119 #if defined(INET) || defined(INET6)
4120 int ii;
4121 #endif
4122 unsigned f;
4123 #ifdef INET
4124 char ip4buf[INET_ADDRSTRLEN];
4125 #endif
4126 #ifdef INET6
4127 char ip6buf[INET6_ADDRSTRLEN];
4128 #endif
4129
4130 db_printf("prison %p:\n", pr);
4131 db_printf(" jid = %d\n", pr->pr_id);
4132 db_printf(" name = %s\n", pr->pr_name);
4133 db_printf(" parent = %p\n", pr->pr_parent);
4134 db_printf(" ref = %d\n", pr->pr_ref);
4135 db_printf(" uref = %d\n", pr->pr_uref);
4136 db_printf(" path = %s\n", pr->pr_path);
4137 db_printf(" cpuset = %d\n", pr->pr_cpuset
4138 ? pr->pr_cpuset->cs_id : -1);
4139 #ifdef VIMAGE
4140 db_printf(" vnet = %p\n", pr->pr_vnet);
4141 #endif
4142 db_printf(" root = %p\n", pr->pr_root);
4143 db_printf(" securelevel = %d\n", pr->pr_securelevel);
4144 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
4145 db_printf(" children.max = %d\n", pr->pr_childmax);
4146 db_printf(" children.cur = %d\n", pr->pr_childcount);
4147 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
4148 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
4149 db_printf(" flags = 0x%x", pr->pr_flags);
4150 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++)
4151 if (pr->pr_flags & bf->flag)
4152 db_printf(" %s", bf->name);
4153 for (jsf = pr_flag_jailsys;
4154 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
4155 jsf++) {
4156 f = pr->pr_flags & (jsf->disable | jsf->new);
4157 db_printf(" %-16s= %s\n", jsf->name,
4158 (f != 0 && f == jsf->disable) ? "disable"
4159 : (f == jsf->new) ? "new"
4160 : "inherit");
4161 }
4162 db_printf(" allow = 0x%x", pr->pr_allow);
4163 for (bf = pr_flag_allow;
4164 bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0;
4165 bf++)
4166 if (pr->pr_allow & bf->flag)
4167 db_printf(" %s", bf->name);
4168 db_printf("\n");
4169 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
4170 db_printf(" host.hostname = %s\n", pr->pr_hostname);
4171 db_printf(" host.domainname = %s\n", pr->pr_domainname);
4172 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
4173 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
4174 #ifdef INET
4175 db_printf(" ip4s = %d\n", pr->pr_ip4s);
4176 for (ii = 0; ii < pr->pr_ip4s; ii++)
4177 db_printf(" %s %s\n",
4178 ii == 0 ? "ip4.addr =" : " ",
4179 inet_ntoa_r(pr->pr_ip4[ii], ip4buf));
4180 #endif
4181 #ifdef INET6
4182 db_printf(" ip6s = %d\n", pr->pr_ip6s);
4183 for (ii = 0; ii < pr->pr_ip6s; ii++)
4184 db_printf(" %s %s\n",
4185 ii == 0 ? "ip6.addr =" : " ",
4186 ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
4187 #endif
4188 }
4189
DB_SHOW_COMMAND(prison,db_show_prison_command)4190 DB_SHOW_COMMAND(prison, db_show_prison_command)
4191 {
4192 struct prison *pr;
4193
4194 if (!have_addr) {
4195 /*
4196 * Show all prisons in the list, and prison0 which is not
4197 * listed.
4198 */
4199 db_show_prison(&prison0);
4200 if (!db_pager_quit) {
4201 TAILQ_FOREACH(pr, &allprison, pr_list) {
4202 db_show_prison(pr);
4203 if (db_pager_quit)
4204 break;
4205 }
4206 }
4207 return;
4208 }
4209
4210 if (addr == 0)
4211 pr = &prison0;
4212 else {
4213 /* Look for a prison with the ID and with references. */
4214 TAILQ_FOREACH(pr, &allprison, pr_list)
4215 if (pr->pr_id == addr && pr->pr_ref > 0)
4216 break;
4217 if (pr == NULL)
4218 /* Look again, without requiring a reference. */
4219 TAILQ_FOREACH(pr, &allprison, pr_list)
4220 if (pr->pr_id == addr)
4221 break;
4222 if (pr == NULL)
4223 /* Assume address points to a valid prison. */
4224 pr = (struct prison *)addr;
4225 }
4226 db_show_prison(pr);
4227 }
4228
4229 #endif /* DDB */
4230