1 /*-
2 * Copyright (c) 1999 Poul-Henning Kamp.
3 * Copyright (c) 2008 Bjoern A. Zeeb.
4 * Copyright (c) 2009 James Gritton.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: stable/9/sys/kern/kern_jail.c 292415 2015-12-18 00:33:03Z jamie $");
31
32 #include "opt_compat.h"
33 #include "opt_ddb.h"
34 #include "opt_inet.h"
35 #include "opt_inet6.h"
36
37 #include <sys/param.h>
38 #include <sys/types.h>
39 #include <sys/kernel.h>
40 #include <sys/systm.h>
41 #include <sys/errno.h>
42 #include <sys/sysproto.h>
43 #include <sys/malloc.h>
44 #include <sys/osd.h>
45 #include <sys/priv.h>
46 #include <sys/proc.h>
47 #include <sys/taskqueue.h>
48 #include <sys/fcntl.h>
49 #include <sys/jail.h>
50 #include <sys/lock.h>
51 #include <sys/mutex.h>
52 #include <sys/racct.h>
53 #include <sys/refcount.h>
54 #include <sys/sx.h>
55 #include <sys/sysent.h>
56 #include <sys/namei.h>
57 #include <sys/mount.h>
58 #include <sys/queue.h>
59 #include <sys/socket.h>
60 #include <sys/syscallsubr.h>
61 #include <sys/sysctl.h>
62 #include <sys/vnode.h>
63
64 #include <net/if.h>
65 #include <net/vnet.h>
66
67 #include <netinet/in.h>
68
69 #ifdef DDB
70 #include <ddb/ddb.h>
71 #ifdef INET6
72 #include <netinet6/in6_var.h>
73 #endif /* INET6 */
74 #endif /* DDB */
75
76 #include <security/mac/mac_framework.h>
77
78 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000"
79
80 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
81 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures");
82
83 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */
84 #ifdef INET
85 #ifdef INET6
86 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
87 #else
88 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
89 #endif
90 #else /* !INET */
91 #ifdef INET6
92 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
93 #else
94 #define _PR_IP_SADDRSEL 0
95 #endif
96 #endif
97
98 /* prison0 describes what is "real" about the system. */
99 struct prison prison0 = {
100 .pr_id = 0,
101 .pr_name = "0",
102 .pr_ref = 1,
103 .pr_uref = 1,
104 .pr_path = "/",
105 .pr_securelevel = -1,
106 .pr_devfs_rsnum = 0,
107 .pr_childmax = JAIL_MAX,
108 .pr_hostuuid = DEFAULT_HOSTUUID,
109 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
110 #ifdef VIMAGE
111 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
112 #else
113 .pr_flags = PR_HOST|_PR_IP_SADDRSEL,
114 #endif
115 .pr_allow = PR_ALLOW_ALL,
116 };
117 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
118
119 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */
120 struct sx allprison_lock;
121 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
122 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
123 LIST_HEAD(, prison_racct) allprison_racct;
124 int lastprid = 0;
125
126 static int do_jail_attach(struct thread *td, struct prison *pr);
127 static void prison_complete(void *context, int pending);
128 static void prison_deref(struct prison *pr, int flags);
129 static char *prison_path(struct prison *pr1, struct prison *pr2);
130 static void prison_remove_one(struct prison *pr);
131 #ifdef RACCT
132 static void prison_racct_attach(struct prison *pr);
133 static void prison_racct_modify(struct prison *pr);
134 static void prison_racct_detach(struct prison *pr);
135 #endif
136 #ifdef INET
137 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia);
138 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4);
139 #endif
140 #ifdef INET6
141 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6);
142 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6);
143 #endif
144
145 /* Flags for prison_deref */
146 #define PD_DEREF 0x01
147 #define PD_DEUREF 0x02
148 #define PD_LOCKED 0x04
149 #define PD_LIST_SLOCKED 0x08
150 #define PD_LIST_XLOCKED 0x10
151
152 /*
153 * Parameter names corresponding to PR_* flag values. Size values are for kvm
154 * as we cannot figure out the size of a sparse array, or an array without a
155 * terminating entry.
156 */
157 static char *pr_flag_names[] = {
158 [0] = "persist",
159 #ifdef INET
160 [7] = "ip4.saddrsel",
161 #endif
162 #ifdef INET6
163 [8] = "ip6.saddrsel",
164 #endif
165 };
166 const size_t pr_flag_names_size = sizeof(pr_flag_names);
167
168 static char *pr_flag_nonames[] = {
169 [0] = "nopersist",
170 #ifdef INET
171 [7] = "ip4.nosaddrsel",
172 #endif
173 #ifdef INET6
174 [8] = "ip6.nosaddrsel",
175 #endif
176 };
177 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames);
178
179 struct jailsys_flags {
180 const char *name;
181 unsigned disable;
182 unsigned new;
183 } pr_flag_jailsys[] = {
184 { "host", 0, PR_HOST },
185 #ifdef VIMAGE
186 { "vnet", 0, PR_VNET },
187 #endif
188 #ifdef INET
189 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER },
190 #endif
191 #ifdef INET6
192 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER },
193 #endif
194 };
195 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
196
197 static char *pr_allow_names[] = {
198 "allow.set_hostname",
199 "allow.sysvipc",
200 "allow.raw_sockets",
201 "allow.chflags",
202 "allow.mount",
203 "allow.quotas",
204 "allow.socket_af",
205 "allow.mount.devfs",
206 "allow.mount.nullfs",
207 "allow.mount.zfs",
208 "allow.mount.procfs",
209 };
210 const size_t pr_allow_names_size = sizeof(pr_allow_names);
211
212 static char *pr_allow_nonames[] = {
213 "allow.noset_hostname",
214 "allow.nosysvipc",
215 "allow.noraw_sockets",
216 "allow.nochflags",
217 "allow.nomount",
218 "allow.noquotas",
219 "allow.nosocket_af",
220 "allow.mount.nodevfs",
221 "allow.mount.nonullfs",
222 "allow.mount.nozfs",
223 "allow.mount.noprocfs",
224 };
225 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames);
226
227 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME
228 #define JAIL_DEFAULT_ENFORCE_STATFS 2
229 #define JAIL_DEFAULT_DEVFS_RSNUM 0
230 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
231 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
232 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
233 #if defined(INET) || defined(INET6)
234 static unsigned jail_max_af_ips = 255;
235 #endif
236
237 #ifdef INET
238 static int
qcmp_v4(const void * ip1,const void * ip2)239 qcmp_v4(const void *ip1, const void *ip2)
240 {
241 in_addr_t iaa, iab;
242
243 /*
244 * We need to compare in HBO here to get the list sorted as expected
245 * by the result of the code. Sorting NBO addresses gives you
246 * interesting results. If you do not understand, do not try.
247 */
248 iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
249 iab = ntohl(((const struct in_addr *)ip2)->s_addr);
250
251 /*
252 * Do not simply return the difference of the two numbers, the int is
253 * not wide enough.
254 */
255 if (iaa > iab)
256 return (1);
257 else if (iaa < iab)
258 return (-1);
259 else
260 return (0);
261 }
262 #endif
263
264 #ifdef INET6
265 static int
qcmp_v6(const void * ip1,const void * ip2)266 qcmp_v6(const void *ip1, const void *ip2)
267 {
268 const struct in6_addr *ia6a, *ia6b;
269 int i, rc;
270
271 ia6a = (const struct in6_addr *)ip1;
272 ia6b = (const struct in6_addr *)ip2;
273
274 rc = 0;
275 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
276 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
277 rc = 1;
278 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
279 rc = -1;
280 }
281 return (rc);
282 }
283 #endif
284
285 /*
286 * struct jail_args {
287 * struct jail *jail;
288 * };
289 */
290 int
sys_jail(struct thread * td,struct jail_args * uap)291 sys_jail(struct thread *td, struct jail_args *uap)
292 {
293 uint32_t version;
294 int error;
295 struct jail j;
296
297 error = copyin(uap->jail, &version, sizeof(uint32_t));
298 if (error)
299 return (error);
300
301 switch (version) {
302 case 0:
303 {
304 struct jail_v0 j0;
305
306 /* FreeBSD single IPv4 jails. */
307 bzero(&j, sizeof(struct jail));
308 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
309 if (error)
310 return (error);
311 j.version = j0.version;
312 j.path = j0.path;
313 j.hostname = j0.hostname;
314 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */
315 break;
316 }
317
318 case 1:
319 /*
320 * Version 1 was used by multi-IPv4 jail implementations
321 * that never made it into the official kernel.
322 */
323 return (EINVAL);
324
325 case 2: /* JAIL_API_VERSION */
326 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
327 error = copyin(uap->jail, &j, sizeof(struct jail));
328 if (error)
329 return (error);
330 break;
331
332 default:
333 /* Sci-Fi jails are not supported, sorry. */
334 return (EINVAL);
335 }
336 return (kern_jail(td, &j));
337 }
338
339 int
kern_jail(struct thread * td,struct jail * j)340 kern_jail(struct thread *td, struct jail *j)
341 {
342 struct iovec optiov[2 * (4
343 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0])
344 #ifdef INET
345 + 1
346 #endif
347 #ifdef INET6
348 + 1
349 #endif
350 )];
351 struct uio opt;
352 char *u_path, *u_hostname, *u_name;
353 #ifdef INET
354 uint32_t ip4s;
355 struct in_addr *u_ip4;
356 #endif
357 #ifdef INET6
358 struct in6_addr *u_ip6;
359 #endif
360 size_t tmplen;
361 int error, enforce_statfs, fi;
362
363 bzero(&optiov, sizeof(optiov));
364 opt.uio_iov = optiov;
365 opt.uio_iovcnt = 0;
366 opt.uio_offset = -1;
367 opt.uio_resid = -1;
368 opt.uio_segflg = UIO_SYSSPACE;
369 opt.uio_rw = UIO_READ;
370 opt.uio_td = td;
371
372 /* Set permissions for top-level jails from sysctls. */
373 if (!jailed(td->td_ucred)) {
374 for (fi = 0; fi < sizeof(pr_allow_names) /
375 sizeof(pr_allow_names[0]); fi++) {
376 optiov[opt.uio_iovcnt].iov_base =
377 (jail_default_allow & (1 << fi))
378 ? pr_allow_names[fi] : pr_allow_nonames[fi];
379 optiov[opt.uio_iovcnt].iov_len =
380 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
381 opt.uio_iovcnt += 2;
382 }
383 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
384 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
385 opt.uio_iovcnt++;
386 enforce_statfs = jail_default_enforce_statfs;
387 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
388 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
389 opt.uio_iovcnt++;
390 }
391
392 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
393 #ifdef INET
394 ip4s = (j->version == 0) ? 1 : j->ip4s;
395 if (ip4s > jail_max_af_ips)
396 return (EINVAL);
397 tmplen += ip4s * sizeof(struct in_addr);
398 #else
399 if (j->ip4s > 0)
400 return (EINVAL);
401 #endif
402 #ifdef INET6
403 if (j->ip6s > jail_max_af_ips)
404 return (EINVAL);
405 tmplen += j->ip6s * sizeof(struct in6_addr);
406 #else
407 if (j->ip6s > 0)
408 return (EINVAL);
409 #endif
410 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
411 u_hostname = u_path + MAXPATHLEN;
412 u_name = u_hostname + MAXHOSTNAMELEN;
413 #ifdef INET
414 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
415 #endif
416 #ifdef INET6
417 #ifdef INET
418 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
419 #else
420 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
421 #endif
422 #endif
423 optiov[opt.uio_iovcnt].iov_base = "path";
424 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
425 opt.uio_iovcnt++;
426 optiov[opt.uio_iovcnt].iov_base = u_path;
427 error = copyinstr(j->path, u_path, MAXPATHLEN,
428 &optiov[opt.uio_iovcnt].iov_len);
429 if (error) {
430 free(u_path, M_TEMP);
431 return (error);
432 }
433 opt.uio_iovcnt++;
434 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
435 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
436 opt.uio_iovcnt++;
437 optiov[opt.uio_iovcnt].iov_base = u_hostname;
438 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
439 &optiov[opt.uio_iovcnt].iov_len);
440 if (error) {
441 free(u_path, M_TEMP);
442 return (error);
443 }
444 opt.uio_iovcnt++;
445 if (j->jailname != NULL) {
446 optiov[opt.uio_iovcnt].iov_base = "name";
447 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
448 opt.uio_iovcnt++;
449 optiov[opt.uio_iovcnt].iov_base = u_name;
450 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
451 &optiov[opt.uio_iovcnt].iov_len);
452 if (error) {
453 free(u_path, M_TEMP);
454 return (error);
455 }
456 opt.uio_iovcnt++;
457 }
458 #ifdef INET
459 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
460 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
461 opt.uio_iovcnt++;
462 optiov[opt.uio_iovcnt].iov_base = u_ip4;
463 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
464 if (j->version == 0)
465 u_ip4->s_addr = j->ip4s;
466 else {
467 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
468 if (error) {
469 free(u_path, M_TEMP);
470 return (error);
471 }
472 }
473 opt.uio_iovcnt++;
474 #endif
475 #ifdef INET6
476 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
477 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
478 opt.uio_iovcnt++;
479 optiov[opt.uio_iovcnt].iov_base = u_ip6;
480 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
481 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
482 if (error) {
483 free(u_path, M_TEMP);
484 return (error);
485 }
486 opt.uio_iovcnt++;
487 #endif
488 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]),
489 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
490 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
491 free(u_path, M_TEMP);
492 return (error);
493 }
494
495
496 /*
497 * struct jail_set_args {
498 * struct iovec *iovp;
499 * unsigned int iovcnt;
500 * int flags;
501 * };
502 */
503 int
sys_jail_set(struct thread * td,struct jail_set_args * uap)504 sys_jail_set(struct thread *td, struct jail_set_args *uap)
505 {
506 struct uio *auio;
507 int error;
508
509 /* Check that we have an even number of iovecs. */
510 if (uap->iovcnt & 1)
511 return (EINVAL);
512
513 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
514 if (error)
515 return (error);
516 error = kern_jail_set(td, auio, uap->flags);
517 free(auio, M_IOV);
518 return (error);
519 }
520
521 int
kern_jail_set(struct thread * td,struct uio * optuio,int flags)522 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
523 {
524 struct nameidata nd;
525 #ifdef INET
526 struct in_addr *ip4;
527 #endif
528 #ifdef INET6
529 struct in6_addr *ip6;
530 #endif
531 struct vfsopt *opt;
532 struct vfsoptlist *opts;
533 struct prison *pr, *deadpr, *mypr, *ppr, *tpr;
534 struct vnode *root;
535 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
536 char *g_path;
537 #if defined(INET) || defined(INET6)
538 struct prison *tppr;
539 void *op;
540 #endif
541 unsigned long hid;
542 size_t namelen, onamelen;
543 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos;
544 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
545 int fi, jid, jsys, len, level;
546 int childmax, rsnum, slevel, vfslocked;
547 int fullpath_disabled;
548 #if defined(INET) || defined(INET6)
549 int ii, ij;
550 #endif
551 #ifdef INET
552 int ip4s, redo_ip4;
553 #endif
554 #ifdef INET6
555 int ip6s, redo_ip6;
556 #endif
557 uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
558 unsigned tallow;
559 char numbuf[12];
560
561 error = priv_check(td, PRIV_JAIL_SET);
562 if (!error && (flags & JAIL_ATTACH))
563 error = priv_check(td, PRIV_JAIL_ATTACH);
564 if (error)
565 return (error);
566 mypr = ppr = td->td_ucred->cr_prison;
567 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
568 return (EPERM);
569 if (flags & ~JAIL_SET_MASK)
570 return (EINVAL);
571
572 /*
573 * Check all the parameters before committing to anything. Not all
574 * errors can be caught early, but we may as well try. Also, this
575 * takes care of some expensive stuff (path lookup) before getting
576 * the allprison lock.
577 *
578 * XXX Jails are not filesystems, and jail parameters are not mount
579 * options. But it makes more sense to re-use the vfsopt code
580 * than duplicate it under a different name.
581 */
582 error = vfs_buildopts(optuio, &opts);
583 if (error)
584 return (error);
585 #ifdef INET
586 ip4 = NULL;
587 #endif
588 #ifdef INET6
589 ip6 = NULL;
590 #endif
591 g_path = NULL;
592
593 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
594 if (error == ENOENT)
595 jid = 0;
596 else if (error != 0)
597 goto done_free;
598
599 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
600 if (error == ENOENT)
601 gotslevel = 0;
602 else if (error != 0)
603 goto done_free;
604 else
605 gotslevel = 1;
606
607 error =
608 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
609 if (error == ENOENT)
610 gotchildmax = 0;
611 else if (error != 0)
612 goto done_free;
613 else
614 gotchildmax = 1;
615
616 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
617 if (error == ENOENT)
618 gotenforce = 0;
619 else if (error != 0)
620 goto done_free;
621 else if (enforce < 0 || enforce > 2) {
622 error = EINVAL;
623 goto done_free;
624 } else
625 gotenforce = 1;
626
627 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
628 if (error == ENOENT)
629 gotrsnum = 0;
630 else if (error != 0)
631 goto done_free;
632 else
633 gotrsnum = 1;
634
635 pr_flags = ch_flags = 0;
636 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
637 fi++) {
638 if (pr_flag_names[fi] == NULL)
639 continue;
640 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi);
641 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi);
642 }
643 ch_flags |= pr_flags;
644 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
645 fi++) {
646 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys,
647 sizeof(jsys));
648 if (error == ENOENT)
649 continue;
650 if (error != 0)
651 goto done_free;
652 switch (jsys) {
653 case JAIL_SYS_DISABLE:
654 if (!pr_flag_jailsys[fi].disable) {
655 error = EINVAL;
656 goto done_free;
657 }
658 pr_flags |= pr_flag_jailsys[fi].disable;
659 break;
660 case JAIL_SYS_NEW:
661 pr_flags |= pr_flag_jailsys[fi].new;
662 break;
663 case JAIL_SYS_INHERIT:
664 break;
665 default:
666 error = EINVAL;
667 goto done_free;
668 }
669 ch_flags |=
670 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable;
671 }
672 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE
673 && !(pr_flags & PR_PERSIST)) {
674 error = EINVAL;
675 vfs_opterror(opts, "new jail must persist or attach");
676 goto done_errmsg;
677 }
678 #ifdef VIMAGE
679 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
680 error = EINVAL;
681 vfs_opterror(opts, "vnet cannot be changed after creation");
682 goto done_errmsg;
683 }
684 #endif
685 #ifdef INET
686 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
687 error = EINVAL;
688 vfs_opterror(opts, "ip4 cannot be changed after creation");
689 goto done_errmsg;
690 }
691 #endif
692 #ifdef INET6
693 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
694 error = EINVAL;
695 vfs_opterror(opts, "ip6 cannot be changed after creation");
696 goto done_errmsg;
697 }
698 #endif
699
700 pr_allow = ch_allow = 0;
701 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
702 fi++) {
703 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi);
704 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi);
705 }
706 ch_allow |= pr_allow;
707
708 error = vfs_getopt(opts, "name", (void **)&name, &len);
709 if (error == ENOENT)
710 name = NULL;
711 else if (error != 0)
712 goto done_free;
713 else {
714 if (len == 0 || name[len - 1] != '\0') {
715 error = EINVAL;
716 goto done_free;
717 }
718 if (len > MAXHOSTNAMELEN) {
719 error = ENAMETOOLONG;
720 goto done_free;
721 }
722 }
723
724 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
725 if (error == ENOENT)
726 host = NULL;
727 else if (error != 0)
728 goto done_free;
729 else {
730 ch_flags |= PR_HOST;
731 pr_flags |= PR_HOST;
732 if (len == 0 || host[len - 1] != '\0') {
733 error = EINVAL;
734 goto done_free;
735 }
736 if (len > MAXHOSTNAMELEN) {
737 error = ENAMETOOLONG;
738 goto done_free;
739 }
740 }
741
742 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
743 if (error == ENOENT)
744 domain = NULL;
745 else if (error != 0)
746 goto done_free;
747 else {
748 ch_flags |= PR_HOST;
749 pr_flags |= PR_HOST;
750 if (len == 0 || domain[len - 1] != '\0') {
751 error = EINVAL;
752 goto done_free;
753 }
754 if (len > MAXHOSTNAMELEN) {
755 error = ENAMETOOLONG;
756 goto done_free;
757 }
758 }
759
760 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
761 if (error == ENOENT)
762 uuid = NULL;
763 else if (error != 0)
764 goto done_free;
765 else {
766 ch_flags |= PR_HOST;
767 pr_flags |= PR_HOST;
768 if (len == 0 || uuid[len - 1] != '\0') {
769 error = EINVAL;
770 goto done_free;
771 }
772 if (len > HOSTUUIDLEN) {
773 error = ENAMETOOLONG;
774 goto done_free;
775 }
776 }
777
778 #ifdef COMPAT_FREEBSD32
779 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
780 uint32_t hid32;
781
782 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
783 hid = hid32;
784 } else
785 #endif
786 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
787 if (error == ENOENT)
788 gothid = 0;
789 else if (error != 0)
790 goto done_free;
791 else {
792 gothid = 1;
793 ch_flags |= PR_HOST;
794 pr_flags |= PR_HOST;
795 }
796
797 #ifdef INET
798 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
799 if (error == ENOENT)
800 ip4s = 0;
801 else if (error != 0)
802 goto done_free;
803 else if (ip4s & (sizeof(*ip4) - 1)) {
804 error = EINVAL;
805 goto done_free;
806 } else {
807 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE;
808 if (ip4s == 0)
809 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE;
810 else {
811 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER;
812 ip4s /= sizeof(*ip4);
813 if (ip4s > jail_max_af_ips) {
814 error = EINVAL;
815 vfs_opterror(opts, "too many IPv4 addresses");
816 goto done_errmsg;
817 }
818 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
819 bcopy(op, ip4, ip4s * sizeof(*ip4));
820 /*
821 * IP addresses are all sorted but ip[0] to preserve
822 * the primary IP address as given from userland.
823 * This special IP is used for unbound outgoing
824 * connections as well for "loopback" traffic in case
825 * source address selection cannot find any more fitting
826 * address to connect from.
827 */
828 if (ip4s > 1)
829 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4);
830 /*
831 * Check for duplicate addresses and do some simple
832 * zero and broadcast checks. If users give other bogus
833 * addresses it is their problem.
834 *
835 * We do not have to care about byte order for these
836 * checks so we will do them in NBO.
837 */
838 for (ii = 0; ii < ip4s; ii++) {
839 if (ip4[ii].s_addr == INADDR_ANY ||
840 ip4[ii].s_addr == INADDR_BROADCAST) {
841 error = EINVAL;
842 goto done_free;
843 }
844 if ((ii+1) < ip4s &&
845 (ip4[0].s_addr == ip4[ii+1].s_addr ||
846 ip4[ii].s_addr == ip4[ii+1].s_addr)) {
847 error = EINVAL;
848 goto done_free;
849 }
850 }
851 }
852 }
853 #endif
854
855 #ifdef INET6
856 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
857 if (error == ENOENT)
858 ip6s = 0;
859 else if (error != 0)
860 goto done_free;
861 else if (ip6s & (sizeof(*ip6) - 1)) {
862 error = EINVAL;
863 goto done_free;
864 } else {
865 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE;
866 if (ip6s == 0)
867 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE;
868 else {
869 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER;
870 ip6s /= sizeof(*ip6);
871 if (ip6s > jail_max_af_ips) {
872 error = EINVAL;
873 vfs_opterror(opts, "too many IPv6 addresses");
874 goto done_errmsg;
875 }
876 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
877 bcopy(op, ip6, ip6s * sizeof(*ip6));
878 if (ip6s > 1)
879 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6);
880 for (ii = 0; ii < ip6s; ii++) {
881 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
882 error = EINVAL;
883 goto done_free;
884 }
885 if ((ii+1) < ip6s &&
886 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
887 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
888 {
889 error = EINVAL;
890 goto done_free;
891 }
892 }
893 }
894 }
895 #endif
896
897 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
898 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
899 error = EINVAL;
900 vfs_opterror(opts,
901 "vnet jails cannot have IP address restrictions");
902 goto done_errmsg;
903 }
904 #endif
905
906 fullpath_disabled = 0;
907 root = NULL;
908 error = vfs_getopt(opts, "path", (void **)&path, &len);
909 if (error == ENOENT)
910 path = NULL;
911 else if (error != 0)
912 goto done_free;
913 else {
914 if (flags & JAIL_UPDATE) {
915 error = EINVAL;
916 vfs_opterror(opts,
917 "path cannot be changed after creation");
918 goto done_errmsg;
919 }
920 if (len == 0 || path[len - 1] != '\0') {
921 error = EINVAL;
922 goto done_free;
923 }
924 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE, UIO_SYSSPACE,
925 path, td);
926 error = namei(&nd);
927 if (error)
928 goto done_free;
929 vfslocked = NDHASGIANT(&nd);
930 root = nd.ni_vp;
931 NDFREE(&nd, NDF_ONLY_PNBUF);
932 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
933 strlcpy(g_path, path, MAXPATHLEN);
934 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
935 if (error == 0)
936 path = g_path;
937 else if (error == ENODEV) {
938 /* proceed if sysctl debug.disablefullpath == 1 */
939 fullpath_disabled = 1;
940 if (len < 2 || (len == 2 && path[0] == '/'))
941 path = NULL;
942 } else {
943 /* exit on other errors */
944 VFS_UNLOCK_GIANT(vfslocked);
945 goto done_free;
946 }
947 if (root->v_type != VDIR) {
948 error = ENOTDIR;
949 vput(root);
950 VFS_UNLOCK_GIANT(vfslocked);
951 goto done_free;
952 }
953 VOP_UNLOCK(root, 0);
954 VFS_UNLOCK_GIANT(vfslocked);
955 if (fullpath_disabled) {
956 /* Leave room for a real-root full pathname. */
957 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/")
958 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) {
959 error = ENAMETOOLONG;
960 goto done_free;
961 }
962 }
963 }
964
965 /*
966 * Grab the allprison lock before letting modules check their
967 * parameters. Once we have it, do not let go so we'll have a
968 * consistent view of the OSD list.
969 */
970 sx_xlock(&allprison_lock);
971 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts);
972 if (error)
973 goto done_unlock_list;
974
975 /* By now, all parameters should have been noted. */
976 TAILQ_FOREACH(opt, opts, link) {
977 if (!opt->seen && strcmp(opt->name, "errmsg")) {
978 error = EINVAL;
979 vfs_opterror(opts, "unknown parameter: %s", opt->name);
980 goto done_unlock_list;
981 }
982 }
983
984 /*
985 * See if we are creating a new record or updating an existing one.
986 * This abuses the file error codes ENOENT and EEXIST.
987 */
988 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
989 if (!cuflags) {
990 error = EINVAL;
991 vfs_opterror(opts, "no valid operation (create or update)");
992 goto done_unlock_list;
993 }
994 pr = NULL;
995 namelc = NULL;
996 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
997 namelc = strrchr(name, '.');
998 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
999 if (*p != '\0')
1000 jid = 0;
1001 }
1002 if (jid != 0) {
1003 /*
1004 * See if a requested jid already exists. There is an
1005 * information leak here if the jid exists but is not within
1006 * the caller's jail hierarchy. Jail creators will get EEXIST
1007 * even though they cannot see the jail, and CREATE | UPDATE
1008 * will return ENOENT which is not normally a valid error.
1009 */
1010 if (jid < 0) {
1011 error = EINVAL;
1012 vfs_opterror(opts, "negative jid");
1013 goto done_unlock_list;
1014 }
1015 pr = prison_find(jid);
1016 if (pr != NULL) {
1017 ppr = pr->pr_parent;
1018 /* Create: jid must not exist. */
1019 if (cuflags == JAIL_CREATE) {
1020 mtx_unlock(&pr->pr_mtx);
1021 error = EEXIST;
1022 vfs_opterror(opts, "jail %d already exists",
1023 jid);
1024 goto done_unlock_list;
1025 }
1026 if (!prison_ischild(mypr, pr)) {
1027 mtx_unlock(&pr->pr_mtx);
1028 pr = NULL;
1029 } else if (pr->pr_uref == 0) {
1030 if (!(flags & JAIL_DYING)) {
1031 mtx_unlock(&pr->pr_mtx);
1032 error = ENOENT;
1033 vfs_opterror(opts, "jail %d is dying",
1034 jid);
1035 goto done_unlock_list;
1036 } else if ((flags & JAIL_ATTACH) ||
1037 (pr_flags & PR_PERSIST)) {
1038 /*
1039 * A dying jail might be resurrected
1040 * (via attach or persist), but first
1041 * it must determine if another jail
1042 * has claimed its name. Accomplish
1043 * this by implicitly re-setting the
1044 * name.
1045 */
1046 if (name == NULL)
1047 name = prison_name(mypr, pr);
1048 }
1049 }
1050 }
1051 if (pr == NULL) {
1052 /* Update: jid must exist. */
1053 if (cuflags == JAIL_UPDATE) {
1054 error = ENOENT;
1055 vfs_opterror(opts, "jail %d not found", jid);
1056 goto done_unlock_list;
1057 }
1058 }
1059 }
1060 /*
1061 * If the caller provided a name, look for a jail by that name.
1062 * This has different semantics for creates and updates keyed by jid
1063 * (where the name must not already exist in a different jail),
1064 * and updates keyed by the name itself (where the name must exist
1065 * because that is the jail being updated).
1066 */
1067 if (name != NULL) {
1068 namelc = strrchr(name, '.');
1069 if (namelc == NULL)
1070 namelc = name;
1071 else {
1072 /*
1073 * This is a hierarchical name. Split it into the
1074 * parent and child names, and make sure the parent
1075 * exists or matches an already found jail.
1076 */
1077 *namelc = '\0';
1078 if (pr != NULL) {
1079 if (strncmp(name, ppr->pr_name, namelc - name)
1080 || ppr->pr_name[namelc - name] != '\0') {
1081 mtx_unlock(&pr->pr_mtx);
1082 error = EINVAL;
1083 vfs_opterror(opts,
1084 "cannot change jail's parent");
1085 goto done_unlock_list;
1086 }
1087 } else {
1088 ppr = prison_find_name(mypr, name);
1089 if (ppr == NULL) {
1090 error = ENOENT;
1091 vfs_opterror(opts,
1092 "jail \"%s\" not found", name);
1093 goto done_unlock_list;
1094 }
1095 mtx_unlock(&ppr->pr_mtx);
1096 }
1097 name = ++namelc;
1098 }
1099 if (name[0] != '\0') {
1100 namelen =
1101 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1102 name_again:
1103 deadpr = NULL;
1104 FOREACH_PRISON_CHILD(ppr, tpr) {
1105 if (tpr != pr && tpr->pr_ref > 0 &&
1106 !strcmp(tpr->pr_name + namelen, name)) {
1107 if (pr == NULL &&
1108 cuflags != JAIL_CREATE) {
1109 mtx_lock(&tpr->pr_mtx);
1110 if (tpr->pr_ref > 0) {
1111 /*
1112 * Use this jail
1113 * for updates.
1114 */
1115 if (tpr->pr_uref > 0) {
1116 pr = tpr;
1117 break;
1118 }
1119 deadpr = tpr;
1120 }
1121 mtx_unlock(&tpr->pr_mtx);
1122 } else if (tpr->pr_uref > 0) {
1123 /*
1124 * Create, or update(jid):
1125 * name must not exist in an
1126 * active sibling jail.
1127 */
1128 error = EEXIST;
1129 if (pr != NULL)
1130 mtx_unlock(&pr->pr_mtx);
1131 vfs_opterror(opts,
1132 "jail \"%s\" already exists",
1133 name);
1134 goto done_unlock_list;
1135 }
1136 }
1137 }
1138 /* If no active jail is found, use a dying one. */
1139 if (deadpr != NULL && pr == NULL) {
1140 if (flags & JAIL_DYING) {
1141 mtx_lock(&deadpr->pr_mtx);
1142 if (deadpr->pr_ref == 0) {
1143 mtx_unlock(&deadpr->pr_mtx);
1144 goto name_again;
1145 }
1146 pr = deadpr;
1147 } else if (cuflags == JAIL_UPDATE) {
1148 error = ENOENT;
1149 vfs_opterror(opts,
1150 "jail \"%s\" is dying", name);
1151 goto done_unlock_list;
1152 }
1153 }
1154 /* Update: name must exist if no jid. */
1155 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1156 error = ENOENT;
1157 vfs_opterror(opts, "jail \"%s\" not found",
1158 name);
1159 goto done_unlock_list;
1160 }
1161 }
1162 }
1163 /* Update: must provide a jid or name. */
1164 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1165 error = ENOENT;
1166 vfs_opterror(opts, "update specified no jail");
1167 goto done_unlock_list;
1168 }
1169
1170 /* If there's no prison to update, create a new one and link it in. */
1171 if (pr == NULL) {
1172 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1173 if (tpr->pr_childcount >= tpr->pr_childmax) {
1174 error = EPERM;
1175 vfs_opterror(opts, "prison limit exceeded");
1176 goto done_unlock_list;
1177 }
1178 created = 1;
1179 mtx_lock(&ppr->pr_mtx);
1180 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) {
1181 mtx_unlock(&ppr->pr_mtx);
1182 error = ENOENT;
1183 vfs_opterror(opts, "parent jail went away!");
1184 goto done_unlock_list;
1185 }
1186 ppr->pr_ref++;
1187 ppr->pr_uref++;
1188 mtx_unlock(&ppr->pr_mtx);
1189 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1190 if (jid == 0) {
1191 /* Find the next free jid. */
1192 jid = lastprid + 1;
1193 findnext:
1194 if (jid == JAIL_MAX)
1195 jid = 1;
1196 TAILQ_FOREACH(tpr, &allprison, pr_list) {
1197 if (tpr->pr_id < jid)
1198 continue;
1199 if (tpr->pr_id > jid || tpr->pr_ref == 0) {
1200 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1201 break;
1202 }
1203 if (jid == lastprid) {
1204 error = EAGAIN;
1205 vfs_opterror(opts,
1206 "no available jail IDs");
1207 free(pr, M_PRISON);
1208 prison_deref(ppr, PD_DEREF |
1209 PD_DEUREF | PD_LIST_XLOCKED);
1210 goto done_releroot;
1211 }
1212 jid++;
1213 goto findnext;
1214 }
1215 lastprid = jid;
1216 } else {
1217 /*
1218 * The jail already has a jid (that did not yet exist),
1219 * so just find where to insert it.
1220 */
1221 TAILQ_FOREACH(tpr, &allprison, pr_list)
1222 if (tpr->pr_id >= jid) {
1223 TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
1224 break;
1225 }
1226 }
1227 if (tpr == NULL)
1228 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1229 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1230 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1231 tpr->pr_childcount++;
1232
1233 pr->pr_parent = ppr;
1234 pr->pr_id = jid;
1235
1236 /* Set some default values, and inherit some from the parent. */
1237 if (name == NULL)
1238 name = "";
1239 if (path == NULL) {
1240 path = "/";
1241 root = mypr->pr_root;
1242 vref(root);
1243 }
1244 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1245 pr->pr_flags |= PR_HOST;
1246 #if defined(INET) || defined(INET6)
1247 #ifdef VIMAGE
1248 if (!(pr_flags & PR_VNET))
1249 #endif
1250 {
1251 #ifdef INET
1252 if (!(ch_flags & PR_IP4_USER))
1253 pr->pr_flags |=
1254 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE;
1255 else if (!(pr_flags & PR_IP4_USER)) {
1256 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1257 if (ppr->pr_ip4 != NULL) {
1258 pr->pr_ip4s = ppr->pr_ip4s;
1259 pr->pr_ip4 = malloc(pr->pr_ip4s *
1260 sizeof(struct in_addr), M_PRISON,
1261 M_WAITOK);
1262 bcopy(ppr->pr_ip4, pr->pr_ip4,
1263 pr->pr_ip4s * sizeof(*pr->pr_ip4));
1264 }
1265 }
1266 #endif
1267 #ifdef INET6
1268 if (!(ch_flags & PR_IP6_USER))
1269 pr->pr_flags |=
1270 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE;
1271 else if (!(pr_flags & PR_IP6_USER)) {
1272 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1273 if (ppr->pr_ip6 != NULL) {
1274 pr->pr_ip6s = ppr->pr_ip6s;
1275 pr->pr_ip6 = malloc(pr->pr_ip6s *
1276 sizeof(struct in6_addr), M_PRISON,
1277 M_WAITOK);
1278 bcopy(ppr->pr_ip6, pr->pr_ip6,
1279 pr->pr_ip6s * sizeof(*pr->pr_ip6));
1280 }
1281 }
1282 #endif
1283 }
1284 #endif
1285 /* Source address selection is always on by default. */
1286 pr->pr_flags |= _PR_IP_SADDRSEL;
1287
1288 pr->pr_securelevel = ppr->pr_securelevel;
1289 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1290 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
1291 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
1292
1293 LIST_INIT(&pr->pr_children);
1294 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1295
1296 #ifdef VIMAGE
1297 /* Allocate a new vnet if specified. */
1298 pr->pr_vnet = (pr_flags & PR_VNET)
1299 ? vnet_alloc() : ppr->pr_vnet;
1300 #endif
1301 /*
1302 * Allocate a dedicated cpuset for each jail.
1303 * Unlike other initial settings, this may return an erorr.
1304 */
1305 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1306 if (error) {
1307 prison_deref(pr, PD_LIST_XLOCKED);
1308 goto done_releroot;
1309 }
1310
1311 mtx_lock(&pr->pr_mtx);
1312 /*
1313 * New prisons do not yet have a reference, because we do not
1314 * want other to see the incomplete prison once the
1315 * allprison_lock is downgraded.
1316 */
1317 } else {
1318 created = 0;
1319 /*
1320 * Grab a reference for existing prisons, to ensure they
1321 * continue to exist for the duration of the call.
1322 */
1323 pr->pr_ref++;
1324 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
1325 if ((pr->pr_flags & PR_VNET) &&
1326 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1327 error = EINVAL;
1328 vfs_opterror(opts,
1329 "vnet jails cannot have IP address restrictions");
1330 goto done_deref_locked;
1331 }
1332 #endif
1333 #ifdef INET
1334 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1335 error = EINVAL;
1336 vfs_opterror(opts,
1337 "ip4 cannot be changed after creation");
1338 goto done_deref_locked;
1339 }
1340 #endif
1341 #ifdef INET6
1342 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1343 error = EINVAL;
1344 vfs_opterror(opts,
1345 "ip6 cannot be changed after creation");
1346 goto done_deref_locked;
1347 }
1348 #endif
1349 }
1350
1351 /* Do final error checking before setting anything. */
1352 if (gotslevel) {
1353 if (slevel < ppr->pr_securelevel) {
1354 error = EPERM;
1355 goto done_deref_locked;
1356 }
1357 }
1358 if (gotchildmax) {
1359 if (childmax >= ppr->pr_childmax) {
1360 error = EPERM;
1361 goto done_deref_locked;
1362 }
1363 }
1364 if (gotenforce) {
1365 if (enforce < ppr->pr_enforce_statfs) {
1366 error = EPERM;
1367 goto done_deref_locked;
1368 }
1369 }
1370 if (gotrsnum) {
1371 /*
1372 * devfs_rsnum is a uint16_t
1373 */
1374 if (rsnum < 0 || rsnum > 65535) {
1375 error = EINVAL;
1376 goto done_deref_locked;
1377 }
1378 /*
1379 * Nested jails always inherit parent's devfs ruleset
1380 */
1381 if (jailed(td->td_ucred)) {
1382 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
1383 error = EPERM;
1384 goto done_deref_locked;
1385 } else
1386 rsnum = ppr->pr_devfs_rsnum;
1387 }
1388 }
1389 #ifdef INET
1390 if (ip4s > 0) {
1391 if (ppr->pr_flags & PR_IP4) {
1392 /*
1393 * Make sure the new set of IP addresses is a
1394 * subset of the parent's list. Don't worry
1395 * about the parent being unlocked, as any
1396 * setting is done with allprison_lock held.
1397 */
1398 for (ij = 0; ij < ppr->pr_ip4s; ij++)
1399 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
1400 break;
1401 if (ij == ppr->pr_ip4s) {
1402 error = EPERM;
1403 goto done_deref_locked;
1404 }
1405 if (ip4s > 1) {
1406 for (ii = ij = 1; ii < ip4s; ii++) {
1407 if (ip4[ii].s_addr ==
1408 ppr->pr_ip4[0].s_addr)
1409 continue;
1410 for (; ij < ppr->pr_ip4s; ij++)
1411 if (ip4[ii].s_addr ==
1412 ppr->pr_ip4[ij].s_addr)
1413 break;
1414 if (ij == ppr->pr_ip4s)
1415 break;
1416 }
1417 if (ij == ppr->pr_ip4s) {
1418 error = EPERM;
1419 goto done_deref_locked;
1420 }
1421 }
1422 }
1423 /*
1424 * Check for conflicting IP addresses. We permit them
1425 * if there is no more than one IP on each jail. If
1426 * there is a duplicate on a jail with more than one
1427 * IP stop checking and return error.
1428 */
1429 tppr = ppr;
1430 #ifdef VIMAGE
1431 for (; tppr != &prison0; tppr = tppr->pr_parent)
1432 if (tppr->pr_flags & PR_VNET)
1433 break;
1434 #endif
1435 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1436 if (tpr == pr ||
1437 #ifdef VIMAGE
1438 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1439 #endif
1440 tpr->pr_uref == 0) {
1441 descend = 0;
1442 continue;
1443 }
1444 if (!(tpr->pr_flags & PR_IP4_USER))
1445 continue;
1446 descend = 0;
1447 if (tpr->pr_ip4 == NULL ||
1448 (ip4s == 1 && tpr->pr_ip4s == 1))
1449 continue;
1450 for (ii = 0; ii < ip4s; ii++) {
1451 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) {
1452 error = EADDRINUSE;
1453 vfs_opterror(opts,
1454 "IPv4 addresses clash");
1455 goto done_deref_locked;
1456 }
1457 }
1458 }
1459 }
1460 #endif
1461 #ifdef INET6
1462 if (ip6s > 0) {
1463 if (ppr->pr_flags & PR_IP6) {
1464 /*
1465 * Make sure the new set of IP addresses is a
1466 * subset of the parent's list.
1467 */
1468 for (ij = 0; ij < ppr->pr_ip6s; ij++)
1469 if (IN6_ARE_ADDR_EQUAL(&ip6[0],
1470 &ppr->pr_ip6[ij]))
1471 break;
1472 if (ij == ppr->pr_ip6s) {
1473 error = EPERM;
1474 goto done_deref_locked;
1475 }
1476 if (ip6s > 1) {
1477 for (ii = ij = 1; ii < ip6s; ii++) {
1478 if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
1479 &ppr->pr_ip6[0]))
1480 continue;
1481 for (; ij < ppr->pr_ip6s; ij++)
1482 if (IN6_ARE_ADDR_EQUAL(
1483 &ip6[ii], &ppr->pr_ip6[ij]))
1484 break;
1485 if (ij == ppr->pr_ip6s)
1486 break;
1487 }
1488 if (ij == ppr->pr_ip6s) {
1489 error = EPERM;
1490 goto done_deref_locked;
1491 }
1492 }
1493 }
1494 /* Check for conflicting IP addresses. */
1495 tppr = ppr;
1496 #ifdef VIMAGE
1497 for (; tppr != &prison0; tppr = tppr->pr_parent)
1498 if (tppr->pr_flags & PR_VNET)
1499 break;
1500 #endif
1501 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
1502 if (tpr == pr ||
1503 #ifdef VIMAGE
1504 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
1505 #endif
1506 tpr->pr_uref == 0) {
1507 descend = 0;
1508 continue;
1509 }
1510 if (!(tpr->pr_flags & PR_IP6_USER))
1511 continue;
1512 descend = 0;
1513 if (tpr->pr_ip6 == NULL ||
1514 (ip6s == 1 && tpr->pr_ip6s == 1))
1515 continue;
1516 for (ii = 0; ii < ip6s; ii++) {
1517 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) {
1518 error = EADDRINUSE;
1519 vfs_opterror(opts,
1520 "IPv6 addresses clash");
1521 goto done_deref_locked;
1522 }
1523 }
1524 }
1525 }
1526 #endif
1527 onamelen = namelen = 0;
1528 if (name != NULL) {
1529 /* Give a default name of the jid. Also allow the name to be
1530 * explicitly the jid - but not any other number, and only in
1531 * normal form (no leading zero/etc).
1532 */
1533 if (name[0] == '\0')
1534 snprintf(name = numbuf, sizeof(numbuf), "%d", jid);
1535 else if ((strtoul(namelc, &p, 10) != jid ||
1536 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') {
1537 error = EINVAL;
1538 vfs_opterror(opts,
1539 "name cannot be numeric (unless it is the jid)");
1540 goto done_deref_locked;
1541 }
1542 /*
1543 * Make sure the name isn't too long for the prison or its
1544 * children.
1545 */
1546 onamelen = strlen(pr->pr_name);
1547 namelen = strlen(name);
1548 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) {
1549 error = ENAMETOOLONG;
1550 goto done_deref_locked;
1551 }
1552 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1553 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
1554 sizeof(pr->pr_name)) {
1555 error = ENAMETOOLONG;
1556 goto done_deref_locked;
1557 }
1558 }
1559 }
1560 if (pr_allow & ~ppr->pr_allow) {
1561 error = EPERM;
1562 goto done_deref_locked;
1563 }
1564
1565 /* Set the parameters of the prison. */
1566 #ifdef INET
1567 redo_ip4 = 0;
1568 if (pr_flags & PR_IP4_USER) {
1569 pr->pr_flags |= PR_IP4;
1570 free(pr->pr_ip4, M_PRISON);
1571 pr->pr_ip4s = ip4s;
1572 pr->pr_ip4 = ip4;
1573 ip4 = NULL;
1574 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1575 #ifdef VIMAGE
1576 if (tpr->pr_flags & PR_VNET) {
1577 descend = 0;
1578 continue;
1579 }
1580 #endif
1581 if (prison_restrict_ip4(tpr, NULL)) {
1582 redo_ip4 = 1;
1583 descend = 0;
1584 }
1585 }
1586 }
1587 #endif
1588 #ifdef INET6
1589 redo_ip6 = 0;
1590 if (pr_flags & PR_IP6_USER) {
1591 pr->pr_flags |= PR_IP6;
1592 free(pr->pr_ip6, M_PRISON);
1593 pr->pr_ip6s = ip6s;
1594 pr->pr_ip6 = ip6;
1595 ip6 = NULL;
1596 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1597 #ifdef VIMAGE
1598 if (tpr->pr_flags & PR_VNET) {
1599 descend = 0;
1600 continue;
1601 }
1602 #endif
1603 if (prison_restrict_ip6(tpr, NULL)) {
1604 redo_ip6 = 1;
1605 descend = 0;
1606 }
1607 }
1608 }
1609 #endif
1610 if (gotslevel) {
1611 pr->pr_securelevel = slevel;
1612 /* Set all child jails to be at least this level. */
1613 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1614 if (tpr->pr_securelevel < slevel)
1615 tpr->pr_securelevel = slevel;
1616 }
1617 if (gotchildmax) {
1618 pr->pr_childmax = childmax;
1619 /* Set all child jails to under this limit. */
1620 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
1621 if (tpr->pr_childmax > childmax - level)
1622 tpr->pr_childmax = childmax > level
1623 ? childmax - level : 0;
1624 }
1625 if (gotenforce) {
1626 pr->pr_enforce_statfs = enforce;
1627 /* Pass this restriction on to the children. */
1628 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1629 if (tpr->pr_enforce_statfs < enforce)
1630 tpr->pr_enforce_statfs = enforce;
1631 }
1632 if (gotrsnum) {
1633 pr->pr_devfs_rsnum = rsnum;
1634 /* Pass this restriction on to the children. */
1635 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1636 tpr->pr_devfs_rsnum = rsnum;
1637 }
1638 if (name != NULL) {
1639 if (ppr == &prison0)
1640 strlcpy(pr->pr_name, name, sizeof(pr->pr_name));
1641 else
1642 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
1643 ppr->pr_name, name);
1644 /* Change this component of child names. */
1645 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1646 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
1647 strlen(tpr->pr_name + onamelen) + 1);
1648 bcopy(pr->pr_name, tpr->pr_name, namelen);
1649 }
1650 }
1651 if (path != NULL) {
1652 /* Try to keep a real-rooted full pathname. */
1653 if (fullpath_disabled && path[0] == '/' &&
1654 strcmp(mypr->pr_path, "/"))
1655 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s",
1656 mypr->pr_path, path);
1657 else
1658 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
1659 pr->pr_root = root;
1660 }
1661 if (PR_HOST & ch_flags & ~pr_flags) {
1662 if (pr->pr_flags & PR_HOST) {
1663 /*
1664 * Copy the parent's host info. As with pr_ip4 above,
1665 * the lack of a lock on the parent is not a problem;
1666 * it is always set with allprison_lock at least
1667 * shared, and is held exclusively here.
1668 */
1669 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
1670 sizeof(pr->pr_hostname));
1671 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
1672 sizeof(pr->pr_domainname));
1673 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
1674 sizeof(pr->pr_hostuuid));
1675 pr->pr_hostid = pr->pr_parent->pr_hostid;
1676 }
1677 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
1678 /* Set this prison, and any descendants without PR_HOST. */
1679 if (host != NULL)
1680 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
1681 if (domain != NULL)
1682 strlcpy(pr->pr_domainname, domain,
1683 sizeof(pr->pr_domainname));
1684 if (uuid != NULL)
1685 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
1686 if (gothid)
1687 pr->pr_hostid = hid;
1688 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1689 if (tpr->pr_flags & PR_HOST)
1690 descend = 0;
1691 else {
1692 if (host != NULL)
1693 strlcpy(tpr->pr_hostname,
1694 pr->pr_hostname,
1695 sizeof(tpr->pr_hostname));
1696 if (domain != NULL)
1697 strlcpy(tpr->pr_domainname,
1698 pr->pr_domainname,
1699 sizeof(tpr->pr_domainname));
1700 if (uuid != NULL)
1701 strlcpy(tpr->pr_hostuuid,
1702 pr->pr_hostuuid,
1703 sizeof(tpr->pr_hostuuid));
1704 if (gothid)
1705 tpr->pr_hostid = hid;
1706 }
1707 }
1708 }
1709 if ((tallow = ch_allow & ~pr_allow)) {
1710 /* Clear allow bits in all children. */
1711 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1712 tpr->pr_allow &= ~tallow;
1713 }
1714 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
1715 /*
1716 * Persistent prisons get an extra reference, and prisons losing their
1717 * persist flag lose that reference. Only do this for existing prisons
1718 * for now, so new ones will remain unseen until after the module
1719 * handlers have completed.
1720 */
1721 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) {
1722 if (pr_flags & PR_PERSIST) {
1723 pr->pr_ref++;
1724 pr->pr_uref++;
1725 } else {
1726 pr->pr_ref--;
1727 pr->pr_uref--;
1728 }
1729 }
1730 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
1731 mtx_unlock(&pr->pr_mtx);
1732
1733 #ifdef RACCT
1734 if (created)
1735 prison_racct_attach(pr);
1736 #endif
1737
1738 /* Locks may have prevented a complete restriction of child IP
1739 * addresses. If so, allocate some more memory and try again.
1740 */
1741 #ifdef INET
1742 while (redo_ip4) {
1743 ip4s = pr->pr_ip4s;
1744 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
1745 mtx_lock(&pr->pr_mtx);
1746 redo_ip4 = 0;
1747 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1748 #ifdef VIMAGE
1749 if (tpr->pr_flags & PR_VNET) {
1750 descend = 0;
1751 continue;
1752 }
1753 #endif
1754 if (prison_restrict_ip4(tpr, ip4)) {
1755 if (ip4 != NULL)
1756 ip4 = NULL;
1757 else
1758 redo_ip4 = 1;
1759 }
1760 }
1761 mtx_unlock(&pr->pr_mtx);
1762 }
1763 #endif
1764 #ifdef INET6
1765 while (redo_ip6) {
1766 ip6s = pr->pr_ip6s;
1767 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
1768 mtx_lock(&pr->pr_mtx);
1769 redo_ip6 = 0;
1770 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1771 #ifdef VIMAGE
1772 if (tpr->pr_flags & PR_VNET) {
1773 descend = 0;
1774 continue;
1775 }
1776 #endif
1777 if (prison_restrict_ip6(tpr, ip6)) {
1778 if (ip6 != NULL)
1779 ip6 = NULL;
1780 else
1781 redo_ip6 = 1;
1782 }
1783 }
1784 mtx_unlock(&pr->pr_mtx);
1785 }
1786 #endif
1787
1788 /* Let the modules do their work. */
1789 sx_downgrade(&allprison_lock);
1790 if (created) {
1791 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
1792 if (error) {
1793 prison_deref(pr, PD_LIST_SLOCKED);
1794 goto done_errmsg;
1795 }
1796 }
1797 error = osd_jail_call(pr, PR_METHOD_SET, opts);
1798 if (error) {
1799 prison_deref(pr, created
1800 ? PD_LIST_SLOCKED
1801 : PD_DEREF | PD_LIST_SLOCKED);
1802 goto done_errmsg;
1803 }
1804
1805 /* Attach this process to the prison if requested. */
1806 if (flags & JAIL_ATTACH) {
1807 mtx_lock(&pr->pr_mtx);
1808 error = do_jail_attach(td, pr);
1809 if (error) {
1810 vfs_opterror(opts, "attach failed");
1811 if (!created)
1812 prison_deref(pr, PD_DEREF);
1813 goto done_errmsg;
1814 }
1815 }
1816
1817 #ifdef RACCT
1818 if (!created) {
1819 sx_sunlock(&allprison_lock);
1820 prison_racct_modify(pr);
1821 sx_slock(&allprison_lock);
1822 }
1823 #endif
1824
1825 td->td_retval[0] = pr->pr_id;
1826
1827 /*
1828 * Now that it is all there, drop the temporary reference from existing
1829 * prisons. Or add a reference to newly created persistent prisons
1830 * (which was not done earlier so that the prison would not be publicly
1831 * visible).
1832 */
1833 if (!created) {
1834 prison_deref(pr, (flags & JAIL_ATTACH)
1835 ? PD_DEREF
1836 : PD_DEREF | PD_LIST_SLOCKED);
1837 } else {
1838 if (pr_flags & PR_PERSIST) {
1839 mtx_lock(&pr->pr_mtx);
1840 pr->pr_ref++;
1841 pr->pr_uref++;
1842 mtx_unlock(&pr->pr_mtx);
1843 }
1844 if (!(flags & JAIL_ATTACH))
1845 sx_sunlock(&allprison_lock);
1846 }
1847
1848 goto done_errmsg;
1849
1850 done_deref_locked:
1851 prison_deref(pr, created
1852 ? PD_LOCKED | PD_LIST_XLOCKED
1853 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
1854 goto done_releroot;
1855 done_unlock_list:
1856 sx_xunlock(&allprison_lock);
1857 done_releroot:
1858 if (root != NULL) {
1859 vfslocked = VFS_LOCK_GIANT(root->v_mount);
1860 vrele(root);
1861 VFS_UNLOCK_GIANT(vfslocked);
1862 }
1863 done_errmsg:
1864 if (error) {
1865 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
1866 if (errmsg_len > 0) {
1867 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
1868 if (errmsg_pos > 0) {
1869 if (optuio->uio_segflg == UIO_SYSSPACE)
1870 bcopy(errmsg,
1871 optuio->uio_iov[errmsg_pos].iov_base,
1872 errmsg_len);
1873 else
1874 copyout(errmsg,
1875 optuio->uio_iov[errmsg_pos].iov_base,
1876 errmsg_len);
1877 }
1878 }
1879 }
1880 done_free:
1881 #ifdef INET
1882 free(ip4, M_PRISON);
1883 #endif
1884 #ifdef INET6
1885 free(ip6, M_PRISON);
1886 #endif
1887 if (g_path != NULL)
1888 free(g_path, M_TEMP);
1889 vfs_freeopts(opts);
1890 return (error);
1891 }
1892
1893
1894 /*
1895 * struct jail_get_args {
1896 * struct iovec *iovp;
1897 * unsigned int iovcnt;
1898 * int flags;
1899 * };
1900 */
1901 int
sys_jail_get(struct thread * td,struct jail_get_args * uap)1902 sys_jail_get(struct thread *td, struct jail_get_args *uap)
1903 {
1904 struct uio *auio;
1905 int error;
1906
1907 /* Check that we have an even number of iovecs. */
1908 if (uap->iovcnt & 1)
1909 return (EINVAL);
1910
1911 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
1912 if (error)
1913 return (error);
1914 error = kern_jail_get(td, auio, uap->flags);
1915 if (error == 0)
1916 error = copyout(auio->uio_iov, uap->iovp,
1917 uap->iovcnt * sizeof (struct iovec));
1918 free(auio, M_IOV);
1919 return (error);
1920 }
1921
1922 int
kern_jail_get(struct thread * td,struct uio * optuio,int flags)1923 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
1924 {
1925 struct prison *pr, *mypr;
1926 struct vfsopt *opt;
1927 struct vfsoptlist *opts;
1928 char *errmsg, *name;
1929 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos;
1930
1931 if (flags & ~JAIL_GET_MASK)
1932 return (EINVAL);
1933
1934 /* Get the parameter list. */
1935 error = vfs_buildopts(optuio, &opts);
1936 if (error)
1937 return (error);
1938 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
1939 mypr = td->td_ucred->cr_prison;
1940
1941 /*
1942 * Find the prison specified by one of: lastjid, jid, name.
1943 */
1944 sx_slock(&allprison_lock);
1945 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
1946 if (error == 0) {
1947 TAILQ_FOREACH(pr, &allprison, pr_list) {
1948 if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
1949 mtx_lock(&pr->pr_mtx);
1950 if (pr->pr_ref > 0 &&
1951 (pr->pr_uref > 0 || (flags & JAIL_DYING)))
1952 break;
1953 mtx_unlock(&pr->pr_mtx);
1954 }
1955 }
1956 if (pr != NULL)
1957 goto found_prison;
1958 error = ENOENT;
1959 vfs_opterror(opts, "no jail after %d", jid);
1960 goto done_unlock_list;
1961 } else if (error != ENOENT)
1962 goto done_unlock_list;
1963
1964 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
1965 if (error == 0) {
1966 if (jid != 0) {
1967 pr = prison_find_child(mypr, jid);
1968 if (pr != NULL) {
1969 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1970 mtx_unlock(&pr->pr_mtx);
1971 error = ENOENT;
1972 vfs_opterror(opts, "jail %d is dying",
1973 jid);
1974 goto done_unlock_list;
1975 }
1976 goto found_prison;
1977 }
1978 error = ENOENT;
1979 vfs_opterror(opts, "jail %d not found", jid);
1980 goto done_unlock_list;
1981 }
1982 } else if (error != ENOENT)
1983 goto done_unlock_list;
1984
1985 error = vfs_getopt(opts, "name", (void **)&name, &len);
1986 if (error == 0) {
1987 if (len == 0 || name[len - 1] != '\0') {
1988 error = EINVAL;
1989 goto done_unlock_list;
1990 }
1991 pr = prison_find_name(mypr, name);
1992 if (pr != NULL) {
1993 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
1994 mtx_unlock(&pr->pr_mtx);
1995 error = ENOENT;
1996 vfs_opterror(opts, "jail \"%s\" is dying",
1997 name);
1998 goto done_unlock_list;
1999 }
2000 goto found_prison;
2001 }
2002 error = ENOENT;
2003 vfs_opterror(opts, "jail \"%s\" not found", name);
2004 goto done_unlock_list;
2005 } else if (error != ENOENT)
2006 goto done_unlock_list;
2007
2008 vfs_opterror(opts, "no jail specified");
2009 error = ENOENT;
2010 goto done_unlock_list;
2011
2012 found_prison:
2013 /* Get the parameters of the prison. */
2014 pr->pr_ref++;
2015 locked = PD_LOCKED;
2016 td->td_retval[0] = pr->pr_id;
2017 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
2018 if (error != 0 && error != ENOENT)
2019 goto done_deref;
2020 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
2021 error = vfs_setopt(opts, "parent", &i, sizeof(i));
2022 if (error != 0 && error != ENOENT)
2023 goto done_deref;
2024 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
2025 if (error != 0 && error != ENOENT)
2026 goto done_deref;
2027 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
2028 sizeof(pr->pr_cpuset->cs_id));
2029 if (error != 0 && error != ENOENT)
2030 goto done_deref;
2031 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
2032 if (error != 0 && error != ENOENT)
2033 goto done_deref;
2034 #ifdef INET
2035 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
2036 pr->pr_ip4s * sizeof(*pr->pr_ip4));
2037 if (error != 0 && error != ENOENT)
2038 goto done_deref;
2039 #endif
2040 #ifdef INET6
2041 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
2042 pr->pr_ip6s * sizeof(*pr->pr_ip6));
2043 if (error != 0 && error != ENOENT)
2044 goto done_deref;
2045 #endif
2046 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
2047 sizeof(pr->pr_securelevel));
2048 if (error != 0 && error != ENOENT)
2049 goto done_deref;
2050 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
2051 sizeof(pr->pr_childcount));
2052 if (error != 0 && error != ENOENT)
2053 goto done_deref;
2054 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
2055 sizeof(pr->pr_childmax));
2056 if (error != 0 && error != ENOENT)
2057 goto done_deref;
2058 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
2059 if (error != 0 && error != ENOENT)
2060 goto done_deref;
2061 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
2062 if (error != 0 && error != ENOENT)
2063 goto done_deref;
2064 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
2065 if (error != 0 && error != ENOENT)
2066 goto done_deref;
2067 #ifdef COMPAT_FREEBSD32
2068 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
2069 uint32_t hid32 = pr->pr_hostid;
2070
2071 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
2072 } else
2073 #endif
2074 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
2075 sizeof(pr->pr_hostid));
2076 if (error != 0 && error != ENOENT)
2077 goto done_deref;
2078 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
2079 sizeof(pr->pr_enforce_statfs));
2080 if (error != 0 && error != ENOENT)
2081 goto done_deref;
2082 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
2083 sizeof(pr->pr_devfs_rsnum));
2084 if (error != 0 && error != ENOENT)
2085 goto done_deref;
2086 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
2087 fi++) {
2088 if (pr_flag_names[fi] == NULL)
2089 continue;
2090 i = (pr->pr_flags & (1 << fi)) ? 1 : 0;
2091 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i));
2092 if (error != 0 && error != ENOENT)
2093 goto done_deref;
2094 i = !i;
2095 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i));
2096 if (error != 0 && error != ENOENT)
2097 goto done_deref;
2098 }
2099 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
2100 fi++) {
2101 i = pr->pr_flags &
2102 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
2103 i = pr_flag_jailsys[fi].disable &&
2104 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE
2105 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW
2106 : JAIL_SYS_INHERIT;
2107 error =
2108 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i));
2109 if (error != 0 && error != ENOENT)
2110 goto done_deref;
2111 }
2112 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
2113 fi++) {
2114 if (pr_allow_names[fi] == NULL)
2115 continue;
2116 i = (pr->pr_allow & (1 << fi)) ? 1 : 0;
2117 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i));
2118 if (error != 0 && error != ENOENT)
2119 goto done_deref;
2120 i = !i;
2121 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i));
2122 if (error != 0 && error != ENOENT)
2123 goto done_deref;
2124 }
2125 i = (pr->pr_uref == 0);
2126 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2127 if (error != 0 && error != ENOENT)
2128 goto done_deref;
2129 i = !i;
2130 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2131 if (error != 0 && error != ENOENT)
2132 goto done_deref;
2133
2134 /* Get the module parameters. */
2135 mtx_unlock(&pr->pr_mtx);
2136 locked = 0;
2137 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2138 if (error)
2139 goto done_deref;
2140 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
2141
2142 /* By now, all parameters should have been noted. */
2143 TAILQ_FOREACH(opt, opts, link) {
2144 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2145 error = EINVAL;
2146 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2147 goto done_errmsg;
2148 }
2149 }
2150
2151 /* Write the fetched parameters back to userspace. */
2152 error = 0;
2153 TAILQ_FOREACH(opt, opts, link) {
2154 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2155 pos = 2 * opt->pos + 1;
2156 optuio->uio_iov[pos].iov_len = opt->len;
2157 if (opt->value != NULL) {
2158 if (optuio->uio_segflg == UIO_SYSSPACE) {
2159 bcopy(opt->value,
2160 optuio->uio_iov[pos].iov_base,
2161 opt->len);
2162 } else {
2163 error = copyout(opt->value,
2164 optuio->uio_iov[pos].iov_base,
2165 opt->len);
2166 if (error)
2167 break;
2168 }
2169 }
2170 }
2171 }
2172 goto done_errmsg;
2173
2174 done_deref:
2175 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
2176 goto done_errmsg;
2177
2178 done_unlock_list:
2179 sx_sunlock(&allprison_lock);
2180 done_errmsg:
2181 if (error && errmsg_pos >= 0) {
2182 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2183 errmsg_pos = 2 * errmsg_pos + 1;
2184 if (errmsg_len > 0) {
2185 if (optuio->uio_segflg == UIO_SYSSPACE)
2186 bcopy(errmsg,
2187 optuio->uio_iov[errmsg_pos].iov_base,
2188 errmsg_len);
2189 else
2190 copyout(errmsg,
2191 optuio->uio_iov[errmsg_pos].iov_base,
2192 errmsg_len);
2193 }
2194 }
2195 vfs_freeopts(opts);
2196 return (error);
2197 }
2198
2199
2200 /*
2201 * struct jail_remove_args {
2202 * int jid;
2203 * };
2204 */
2205 int
sys_jail_remove(struct thread * td,struct jail_remove_args * uap)2206 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
2207 {
2208 struct prison *pr, *cpr, *lpr, *tpr;
2209 int descend, error;
2210
2211 error = priv_check(td, PRIV_JAIL_REMOVE);
2212 if (error)
2213 return (error);
2214
2215 sx_xlock(&allprison_lock);
2216 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2217 if (pr == NULL) {
2218 sx_xunlock(&allprison_lock);
2219 return (EINVAL);
2220 }
2221
2222 /* Remove all descendants of this prison, then remove this prison. */
2223 pr->pr_ref++;
2224 pr->pr_flags |= PR_REMOVE;
2225 if (!LIST_EMPTY(&pr->pr_children)) {
2226 mtx_unlock(&pr->pr_mtx);
2227 lpr = NULL;
2228 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
2229 mtx_lock(&cpr->pr_mtx);
2230 if (cpr->pr_ref > 0) {
2231 tpr = cpr;
2232 cpr->pr_ref++;
2233 cpr->pr_flags |= PR_REMOVE;
2234 } else {
2235 /* Already removed - do not do it again. */
2236 tpr = NULL;
2237 }
2238 mtx_unlock(&cpr->pr_mtx);
2239 if (lpr != NULL) {
2240 mtx_lock(&lpr->pr_mtx);
2241 prison_remove_one(lpr);
2242 sx_xlock(&allprison_lock);
2243 }
2244 lpr = tpr;
2245 }
2246 if (lpr != NULL) {
2247 mtx_lock(&lpr->pr_mtx);
2248 prison_remove_one(lpr);
2249 sx_xlock(&allprison_lock);
2250 }
2251 mtx_lock(&pr->pr_mtx);
2252 }
2253 prison_remove_one(pr);
2254 return (0);
2255 }
2256
2257 static void
prison_remove_one(struct prison * pr)2258 prison_remove_one(struct prison *pr)
2259 {
2260 struct proc *p;
2261 int deuref;
2262
2263 /* If the prison was persistent, it is not anymore. */
2264 deuref = 0;
2265 if (pr->pr_flags & PR_PERSIST) {
2266 pr->pr_ref--;
2267 deuref = PD_DEUREF;
2268 pr->pr_flags &= ~PR_PERSIST;
2269 }
2270
2271 /*
2272 * jail_remove added a reference. If that's the only one, remove
2273 * the prison now.
2274 */
2275 KASSERT(pr->pr_ref > 0,
2276 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
2277 if (pr->pr_ref == 1) {
2278 prison_deref(pr,
2279 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
2280 return;
2281 }
2282
2283 mtx_unlock(&pr->pr_mtx);
2284 sx_xunlock(&allprison_lock);
2285 /*
2286 * Kill all processes unfortunate enough to be attached to this prison.
2287 */
2288 sx_slock(&allproc_lock);
2289 LIST_FOREACH(p, &allproc, p_list) {
2290 PROC_LOCK(p);
2291 if (p->p_state != PRS_NEW && p->p_ucred &&
2292 p->p_ucred->cr_prison == pr)
2293 kern_psignal(p, SIGKILL);
2294 PROC_UNLOCK(p);
2295 }
2296 sx_sunlock(&allproc_lock);
2297 /* Remove the temporary reference added by jail_remove. */
2298 prison_deref(pr, deuref | PD_DEREF);
2299 }
2300
2301
2302 /*
2303 * struct jail_attach_args {
2304 * int jid;
2305 * };
2306 */
2307 int
sys_jail_attach(struct thread * td,struct jail_attach_args * uap)2308 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
2309 {
2310 struct prison *pr;
2311 int error;
2312
2313 error = priv_check(td, PRIV_JAIL_ATTACH);
2314 if (error)
2315 return (error);
2316
2317 sx_slock(&allprison_lock);
2318 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2319 if (pr == NULL) {
2320 sx_sunlock(&allprison_lock);
2321 return (EINVAL);
2322 }
2323
2324 /*
2325 * Do not allow a process to attach to a prison that is not
2326 * considered to be "alive".
2327 */
2328 if (pr->pr_uref == 0) {
2329 mtx_unlock(&pr->pr_mtx);
2330 sx_sunlock(&allprison_lock);
2331 return (EINVAL);
2332 }
2333
2334 return (do_jail_attach(td, pr));
2335 }
2336
2337 static int
do_jail_attach(struct thread * td,struct prison * pr)2338 do_jail_attach(struct thread *td, struct prison *pr)
2339 {
2340 struct prison *ppr;
2341 struct proc *p;
2342 struct ucred *newcred, *oldcred;
2343 int vfslocked, error;
2344
2345 /*
2346 * XXX: Note that there is a slight race here if two threads
2347 * in the same privileged process attempt to attach to two
2348 * different jails at the same time. It is important for
2349 * user processes not to do this, or they might end up with
2350 * a process root from one prison, but attached to the jail
2351 * of another.
2352 */
2353 pr->pr_ref++;
2354 pr->pr_uref++;
2355 mtx_unlock(&pr->pr_mtx);
2356
2357 /* Let modules do whatever they need to prepare for attaching. */
2358 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
2359 if (error) {
2360 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
2361 return (error);
2362 }
2363 sx_sunlock(&allprison_lock);
2364
2365 /*
2366 * Reparent the newly attached process to this jail.
2367 */
2368 ppr = td->td_ucred->cr_prison;
2369 p = td->td_proc;
2370 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
2371 if (error)
2372 goto e_revert_osd;
2373
2374 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
2375 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
2376 if ((error = change_dir(pr->pr_root, td)) != 0)
2377 goto e_unlock;
2378 #ifdef MAC
2379 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
2380 goto e_unlock;
2381 #endif
2382 VOP_UNLOCK(pr->pr_root, 0);
2383 if ((error = change_root(pr->pr_root, td)))
2384 goto e_unlock_giant;
2385 VFS_UNLOCK_GIANT(vfslocked);
2386
2387 newcred = crget();
2388 PROC_LOCK(p);
2389 oldcred = p->p_ucred;
2390 setsugid(p);
2391 crcopy(newcred, oldcred);
2392 newcred->cr_prison = pr;
2393 p->p_ucred = newcred;
2394 PROC_UNLOCK(p);
2395 #ifdef RACCT
2396 racct_proc_ucred_changed(p, oldcred, newcred);
2397 #endif
2398 crfree(oldcred);
2399 prison_deref(ppr, PD_DEREF | PD_DEUREF);
2400 return (0);
2401 e_unlock:
2402 VOP_UNLOCK(pr->pr_root, 0);
2403 e_unlock_giant:
2404 VFS_UNLOCK_GIANT(vfslocked);
2405 e_revert_osd:
2406 /* Tell modules this thread is still in its old jail after all. */
2407 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td);
2408 prison_deref(pr, PD_DEREF | PD_DEUREF);
2409 return (error);
2410 }
2411
2412
2413 /*
2414 * Returns a locked prison instance, or NULL on failure.
2415 */
2416 struct prison *
prison_find(int prid)2417 prison_find(int prid)
2418 {
2419 struct prison *pr;
2420
2421 sx_assert(&allprison_lock, SX_LOCKED);
2422 TAILQ_FOREACH(pr, &allprison, pr_list) {
2423 if (pr->pr_id == prid) {
2424 mtx_lock(&pr->pr_mtx);
2425 if (pr->pr_ref > 0)
2426 return (pr);
2427 mtx_unlock(&pr->pr_mtx);
2428 }
2429 }
2430 return (NULL);
2431 }
2432
2433 /*
2434 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
2435 */
2436 struct prison *
prison_find_child(struct prison * mypr,int prid)2437 prison_find_child(struct prison *mypr, int prid)
2438 {
2439 struct prison *pr;
2440 int descend;
2441
2442 sx_assert(&allprison_lock, SX_LOCKED);
2443 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2444 if (pr->pr_id == prid) {
2445 mtx_lock(&pr->pr_mtx);
2446 if (pr->pr_ref > 0)
2447 return (pr);
2448 mtx_unlock(&pr->pr_mtx);
2449 }
2450 }
2451 return (NULL);
2452 }
2453
2454 /*
2455 * Look for the name relative to mypr. Returns a locked prison or NULL.
2456 */
2457 struct prison *
prison_find_name(struct prison * mypr,const char * name)2458 prison_find_name(struct prison *mypr, const char *name)
2459 {
2460 struct prison *pr, *deadpr;
2461 size_t mylen;
2462 int descend;
2463
2464 sx_assert(&allprison_lock, SX_LOCKED);
2465 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
2466 again:
2467 deadpr = NULL;
2468 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2469 if (!strcmp(pr->pr_name + mylen, name)) {
2470 mtx_lock(&pr->pr_mtx);
2471 if (pr->pr_ref > 0) {
2472 if (pr->pr_uref > 0)
2473 return (pr);
2474 deadpr = pr;
2475 }
2476 mtx_unlock(&pr->pr_mtx);
2477 }
2478 }
2479 /* There was no valid prison - perhaps there was a dying one. */
2480 if (deadpr != NULL) {
2481 mtx_lock(&deadpr->pr_mtx);
2482 if (deadpr->pr_ref == 0) {
2483 mtx_unlock(&deadpr->pr_mtx);
2484 goto again;
2485 }
2486 }
2487 return (deadpr);
2488 }
2489
2490 /*
2491 * See if a prison has the specific flag set.
2492 */
2493 int
prison_flag(struct ucred * cred,unsigned flag)2494 prison_flag(struct ucred *cred, unsigned flag)
2495 {
2496
2497 /* This is an atomic read, so no locking is necessary. */
2498 return (cred->cr_prison->pr_flags & flag);
2499 }
2500
2501 int
prison_allow(struct ucred * cred,unsigned flag)2502 prison_allow(struct ucred *cred, unsigned flag)
2503 {
2504
2505 /* This is an atomic read, so no locking is necessary. */
2506 return (cred->cr_prison->pr_allow & flag);
2507 }
2508
2509 /*
2510 * Remove a prison reference. If that was the last reference, remove the
2511 * prison itself - but not in this context in case there are locks held.
2512 */
2513 void
prison_free_locked(struct prison * pr)2514 prison_free_locked(struct prison *pr)
2515 {
2516
2517 mtx_assert(&pr->pr_mtx, MA_OWNED);
2518 pr->pr_ref--;
2519 if (pr->pr_ref == 0) {
2520 mtx_unlock(&pr->pr_mtx);
2521 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
2522 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2523 return;
2524 }
2525 mtx_unlock(&pr->pr_mtx);
2526 }
2527
2528 void
prison_free(struct prison * pr)2529 prison_free(struct prison *pr)
2530 {
2531
2532 mtx_lock(&pr->pr_mtx);
2533 prison_free_locked(pr);
2534 }
2535
2536 static void
prison_complete(void * context,int pending)2537 prison_complete(void *context, int pending)
2538 {
2539
2540 prison_deref((struct prison *)context, 0);
2541 }
2542
2543 /*
2544 * Remove a prison reference (usually). This internal version assumes no
2545 * mutexes are held, except perhaps the prison itself. If there are no more
2546 * references, release and delist the prison. On completion, the prison lock
2547 * and the allprison lock are both unlocked.
2548 */
2549 static void
prison_deref(struct prison * pr,int flags)2550 prison_deref(struct prison *pr, int flags)
2551 {
2552 struct prison *ppr, *tpr;
2553 int vfslocked;
2554
2555 if (!(flags & PD_LOCKED))
2556 mtx_lock(&pr->pr_mtx);
2557 for (;;) {
2558 if (flags & PD_DEUREF) {
2559 pr->pr_uref--;
2560 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0"));
2561 }
2562 if (flags & PD_DEREF)
2563 pr->pr_ref--;
2564 /* If the prison still has references, nothing else to do. */
2565 if (pr->pr_ref > 0) {
2566 mtx_unlock(&pr->pr_mtx);
2567 if (flags & PD_LIST_SLOCKED)
2568 sx_sunlock(&allprison_lock);
2569 else if (flags & PD_LIST_XLOCKED)
2570 sx_xunlock(&allprison_lock);
2571 return;
2572 }
2573
2574 mtx_unlock(&pr->pr_mtx);
2575 if (flags & PD_LIST_SLOCKED) {
2576 if (!sx_try_upgrade(&allprison_lock)) {
2577 sx_sunlock(&allprison_lock);
2578 sx_xlock(&allprison_lock);
2579 }
2580 } else if (!(flags & PD_LIST_XLOCKED))
2581 sx_xlock(&allprison_lock);
2582
2583 TAILQ_REMOVE(&allprison, pr, pr_list);
2584 LIST_REMOVE(pr, pr_sibling);
2585 ppr = pr->pr_parent;
2586 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
2587 tpr->pr_childcount--;
2588 sx_xunlock(&allprison_lock);
2589
2590 #ifdef VIMAGE
2591 if (pr->pr_vnet != ppr->pr_vnet)
2592 vnet_destroy(pr->pr_vnet);
2593 #endif
2594 if (pr->pr_root != NULL) {
2595 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
2596 vrele(pr->pr_root);
2597 VFS_UNLOCK_GIANT(vfslocked);
2598 }
2599 mtx_destroy(&pr->pr_mtx);
2600 #ifdef INET
2601 free(pr->pr_ip4, M_PRISON);
2602 #endif
2603 #ifdef INET6
2604 free(pr->pr_ip6, M_PRISON);
2605 #endif
2606 if (pr->pr_cpuset != NULL)
2607 cpuset_rel(pr->pr_cpuset);
2608 osd_jail_exit(pr);
2609 #ifdef RACCT
2610 prison_racct_detach(pr);
2611 #endif
2612 free(pr, M_PRISON);
2613
2614 /* Removing a prison frees a reference on its parent. */
2615 pr = ppr;
2616 mtx_lock(&pr->pr_mtx);
2617 flags = PD_DEREF | PD_DEUREF;
2618 }
2619 }
2620
2621 void
prison_hold_locked(struct prison * pr)2622 prison_hold_locked(struct prison *pr)
2623 {
2624
2625 mtx_assert(&pr->pr_mtx, MA_OWNED);
2626 KASSERT(pr->pr_ref > 0,
2627 ("Trying to hold dead prison (jid=%d).", pr->pr_id));
2628 pr->pr_ref++;
2629 }
2630
2631 void
prison_hold(struct prison * pr)2632 prison_hold(struct prison *pr)
2633 {
2634
2635 mtx_lock(&pr->pr_mtx);
2636 prison_hold_locked(pr);
2637 mtx_unlock(&pr->pr_mtx);
2638 }
2639
2640 void
prison_proc_hold(struct prison * pr)2641 prison_proc_hold(struct prison *pr)
2642 {
2643
2644 mtx_lock(&pr->pr_mtx);
2645 KASSERT(pr->pr_uref > 0,
2646 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
2647 pr->pr_uref++;
2648 mtx_unlock(&pr->pr_mtx);
2649 }
2650
2651 void
prison_proc_free(struct prison * pr)2652 prison_proc_free(struct prison *pr)
2653 {
2654
2655 mtx_lock(&pr->pr_mtx);
2656 KASSERT(pr->pr_uref > 0,
2657 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
2658 prison_deref(pr, PD_DEUREF | PD_LOCKED);
2659 }
2660
2661
2662 #ifdef INET
2663 /*
2664 * Restrict a prison's IP address list with its parent's, possibly replacing
2665 * it. Return true if the replacement buffer was used (or would have been).
2666 */
2667 static int
prison_restrict_ip4(struct prison * pr,struct in_addr * newip4)2668 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
2669 {
2670 int ii, ij, used;
2671 struct prison *ppr;
2672
2673 ppr = pr->pr_parent;
2674 if (!(pr->pr_flags & PR_IP4_USER)) {
2675 /* This has no user settings, so just copy the parent's list. */
2676 if (pr->pr_ip4s < ppr->pr_ip4s) {
2677 /*
2678 * There's no room for the parent's list. Use the
2679 * new list buffer, which is assumed to be big enough
2680 * (if it was passed). If there's no buffer, try to
2681 * allocate one.
2682 */
2683 used = 1;
2684 if (newip4 == NULL) {
2685 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
2686 M_PRISON, M_NOWAIT);
2687 if (newip4 != NULL)
2688 used = 0;
2689 }
2690 if (newip4 != NULL) {
2691 bcopy(ppr->pr_ip4, newip4,
2692 ppr->pr_ip4s * sizeof(*newip4));
2693 free(pr->pr_ip4, M_PRISON);
2694 pr->pr_ip4 = newip4;
2695 pr->pr_ip4s = ppr->pr_ip4s;
2696 }
2697 return (used);
2698 }
2699 pr->pr_ip4s = ppr->pr_ip4s;
2700 if (pr->pr_ip4s > 0)
2701 bcopy(ppr->pr_ip4, pr->pr_ip4,
2702 pr->pr_ip4s * sizeof(*newip4));
2703 else if (pr->pr_ip4 != NULL) {
2704 free(pr->pr_ip4, M_PRISON);
2705 pr->pr_ip4 = NULL;
2706 }
2707 } else if (pr->pr_ip4s > 0) {
2708 /* Remove addresses that aren't in the parent. */
2709 for (ij = 0; ij < ppr->pr_ip4s; ij++)
2710 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
2711 break;
2712 if (ij < ppr->pr_ip4s)
2713 ii = 1;
2714 else {
2715 bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
2716 --pr->pr_ip4s * sizeof(*pr->pr_ip4));
2717 ii = 0;
2718 }
2719 for (ij = 1; ii < pr->pr_ip4s; ) {
2720 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
2721 ii++;
2722 continue;
2723 }
2724 switch (ij >= ppr->pr_ip4s ? -1 :
2725 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
2726 case -1:
2727 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
2728 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
2729 break;
2730 case 0:
2731 ii++;
2732 ij++;
2733 break;
2734 case 1:
2735 ij++;
2736 break;
2737 }
2738 }
2739 if (pr->pr_ip4s == 0) {
2740 pr->pr_flags |= PR_IP4_DISABLE;
2741 free(pr->pr_ip4, M_PRISON);
2742 pr->pr_ip4 = NULL;
2743 }
2744 }
2745 return (0);
2746 }
2747
2748 /*
2749 * Pass back primary IPv4 address of this jail.
2750 *
2751 * If not restricted return success but do not alter the address. Caller has
2752 * to make sure to initialize it correctly (e.g. INADDR_ANY).
2753 *
2754 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2755 * Address returned in NBO.
2756 */
2757 int
prison_get_ip4(struct ucred * cred,struct in_addr * ia)2758 prison_get_ip4(struct ucred *cred, struct in_addr *ia)
2759 {
2760 struct prison *pr;
2761
2762 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2763 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2764
2765 pr = cred->cr_prison;
2766 if (!(pr->pr_flags & PR_IP4))
2767 return (0);
2768 mtx_lock(&pr->pr_mtx);
2769 if (!(pr->pr_flags & PR_IP4)) {
2770 mtx_unlock(&pr->pr_mtx);
2771 return (0);
2772 }
2773 if (pr->pr_ip4 == NULL) {
2774 mtx_unlock(&pr->pr_mtx);
2775 return (EAFNOSUPPORT);
2776 }
2777
2778 ia->s_addr = pr->pr_ip4[0].s_addr;
2779 mtx_unlock(&pr->pr_mtx);
2780 return (0);
2781 }
2782
2783 /*
2784 * Return 1 if we should do proper source address selection or are not jailed.
2785 * We will return 0 if we should bypass source address selection in favour
2786 * of the primary jail IPv4 address. Only in this case *ia will be updated and
2787 * returned in NBO.
2788 * Return EAFNOSUPPORT, in case this jail does not allow IPv4.
2789 */
2790 int
prison_saddrsel_ip4(struct ucred * cred,struct in_addr * ia)2791 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
2792 {
2793 struct prison *pr;
2794 struct in_addr lia;
2795 int error;
2796
2797 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2798 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2799
2800 if (!jailed(cred))
2801 return (1);
2802
2803 pr = cred->cr_prison;
2804 if (pr->pr_flags & PR_IP4_SADDRSEL)
2805 return (1);
2806
2807 lia.s_addr = INADDR_ANY;
2808 error = prison_get_ip4(cred, &lia);
2809 if (error)
2810 return (error);
2811 if (lia.s_addr == INADDR_ANY)
2812 return (1);
2813
2814 ia->s_addr = lia.s_addr;
2815 return (0);
2816 }
2817
2818 /*
2819 * Return true if pr1 and pr2 have the same IPv4 address restrictions.
2820 */
2821 int
prison_equal_ip4(struct prison * pr1,struct prison * pr2)2822 prison_equal_ip4(struct prison *pr1, struct prison *pr2)
2823 {
2824
2825 if (pr1 == pr2)
2826 return (1);
2827
2828 /*
2829 * No need to lock since the PR_IP4_USER flag can't be altered for
2830 * existing prisons.
2831 */
2832 while (pr1 != &prison0 &&
2833 #ifdef VIMAGE
2834 !(pr1->pr_flags & PR_VNET) &&
2835 #endif
2836 !(pr1->pr_flags & PR_IP4_USER))
2837 pr1 = pr1->pr_parent;
2838 while (pr2 != &prison0 &&
2839 #ifdef VIMAGE
2840 !(pr2->pr_flags & PR_VNET) &&
2841 #endif
2842 !(pr2->pr_flags & PR_IP4_USER))
2843 pr2 = pr2->pr_parent;
2844 return (pr1 == pr2);
2845 }
2846
2847 /*
2848 * Make sure our (source) address is set to something meaningful to this
2849 * jail.
2850 *
2851 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2852 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2853 * doesn't allow IPv4. Address passed in in NBO and returned in NBO.
2854 */
2855 int
prison_local_ip4(struct ucred * cred,struct in_addr * ia)2856 prison_local_ip4(struct ucred *cred, struct in_addr *ia)
2857 {
2858 struct prison *pr;
2859 struct in_addr ia0;
2860 int error;
2861
2862 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2863 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2864
2865 pr = cred->cr_prison;
2866 if (!(pr->pr_flags & PR_IP4))
2867 return (0);
2868 mtx_lock(&pr->pr_mtx);
2869 if (!(pr->pr_flags & PR_IP4)) {
2870 mtx_unlock(&pr->pr_mtx);
2871 return (0);
2872 }
2873 if (pr->pr_ip4 == NULL) {
2874 mtx_unlock(&pr->pr_mtx);
2875 return (EAFNOSUPPORT);
2876 }
2877
2878 ia0.s_addr = ntohl(ia->s_addr);
2879 if (ia0.s_addr == INADDR_LOOPBACK) {
2880 ia->s_addr = pr->pr_ip4[0].s_addr;
2881 mtx_unlock(&pr->pr_mtx);
2882 return (0);
2883 }
2884
2885 if (ia0.s_addr == INADDR_ANY) {
2886 /*
2887 * In case there is only 1 IPv4 address, bind directly.
2888 */
2889 if (pr->pr_ip4s == 1)
2890 ia->s_addr = pr->pr_ip4[0].s_addr;
2891 mtx_unlock(&pr->pr_mtx);
2892 return (0);
2893 }
2894
2895 error = _prison_check_ip4(pr, ia);
2896 mtx_unlock(&pr->pr_mtx);
2897 return (error);
2898 }
2899
2900 /*
2901 * Rewrite destination address in case we will connect to loopback address.
2902 *
2903 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
2904 * Address passed in in NBO and returned in NBO.
2905 */
2906 int
prison_remote_ip4(struct ucred * cred,struct in_addr * ia)2907 prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
2908 {
2909 struct prison *pr;
2910
2911 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2912 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2913
2914 pr = cred->cr_prison;
2915 if (!(pr->pr_flags & PR_IP4))
2916 return (0);
2917 mtx_lock(&pr->pr_mtx);
2918 if (!(pr->pr_flags & PR_IP4)) {
2919 mtx_unlock(&pr->pr_mtx);
2920 return (0);
2921 }
2922 if (pr->pr_ip4 == NULL) {
2923 mtx_unlock(&pr->pr_mtx);
2924 return (EAFNOSUPPORT);
2925 }
2926
2927 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) {
2928 ia->s_addr = pr->pr_ip4[0].s_addr;
2929 mtx_unlock(&pr->pr_mtx);
2930 return (0);
2931 }
2932
2933 /*
2934 * Return success because nothing had to be changed.
2935 */
2936 mtx_unlock(&pr->pr_mtx);
2937 return (0);
2938 }
2939
2940 /*
2941 * Check if given address belongs to the jail referenced by cred/prison.
2942 *
2943 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
2944 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
2945 * doesn't allow IPv4. Address passed in in NBO.
2946 */
2947 static int
_prison_check_ip4(struct prison * pr,struct in_addr * ia)2948 _prison_check_ip4(struct prison *pr, struct in_addr *ia)
2949 {
2950 int i, a, z, d;
2951
2952 /*
2953 * Check the primary IP.
2954 */
2955 if (pr->pr_ip4[0].s_addr == ia->s_addr)
2956 return (0);
2957
2958 /*
2959 * All the other IPs are sorted so we can do a binary search.
2960 */
2961 a = 0;
2962 z = pr->pr_ip4s - 2;
2963 while (a <= z) {
2964 i = (a + z) / 2;
2965 d = qcmp_v4(&pr->pr_ip4[i+1], ia);
2966 if (d > 0)
2967 z = i - 1;
2968 else if (d < 0)
2969 a = i + 1;
2970 else
2971 return (0);
2972 }
2973
2974 return (EADDRNOTAVAIL);
2975 }
2976
2977 int
prison_check_ip4(struct ucred * cred,struct in_addr * ia)2978 prison_check_ip4(struct ucred *cred, struct in_addr *ia)
2979 {
2980 struct prison *pr;
2981 int error;
2982
2983 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
2984 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
2985
2986 pr = cred->cr_prison;
2987 if (!(pr->pr_flags & PR_IP4))
2988 return (0);
2989 mtx_lock(&pr->pr_mtx);
2990 if (!(pr->pr_flags & PR_IP4)) {
2991 mtx_unlock(&pr->pr_mtx);
2992 return (0);
2993 }
2994 if (pr->pr_ip4 == NULL) {
2995 mtx_unlock(&pr->pr_mtx);
2996 return (EAFNOSUPPORT);
2997 }
2998
2999 error = _prison_check_ip4(pr, ia);
3000 mtx_unlock(&pr->pr_mtx);
3001 return (error);
3002 }
3003 #endif
3004
3005 #ifdef INET6
3006 static int
prison_restrict_ip6(struct prison * pr,struct in6_addr * newip6)3007 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
3008 {
3009 int ii, ij, used;
3010 struct prison *ppr;
3011
3012 ppr = pr->pr_parent;
3013 if (!(pr->pr_flags & PR_IP6_USER)) {
3014 /* This has no user settings, so just copy the parent's list. */
3015 if (pr->pr_ip6s < ppr->pr_ip6s) {
3016 /*
3017 * There's no room for the parent's list. Use the
3018 * new list buffer, which is assumed to be big enough
3019 * (if it was passed). If there's no buffer, try to
3020 * allocate one.
3021 */
3022 used = 1;
3023 if (newip6 == NULL) {
3024 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
3025 M_PRISON, M_NOWAIT);
3026 if (newip6 != NULL)
3027 used = 0;
3028 }
3029 if (newip6 != NULL) {
3030 bcopy(ppr->pr_ip6, newip6,
3031 ppr->pr_ip6s * sizeof(*newip6));
3032 free(pr->pr_ip6, M_PRISON);
3033 pr->pr_ip6 = newip6;
3034 pr->pr_ip6s = ppr->pr_ip6s;
3035 }
3036 return (used);
3037 }
3038 pr->pr_ip6s = ppr->pr_ip6s;
3039 if (pr->pr_ip6s > 0)
3040 bcopy(ppr->pr_ip6, pr->pr_ip6,
3041 pr->pr_ip6s * sizeof(*newip6));
3042 else if (pr->pr_ip6 != NULL) {
3043 free(pr->pr_ip6, M_PRISON);
3044 pr->pr_ip6 = NULL;
3045 }
3046 } else if (pr->pr_ip6s > 0) {
3047 /* Remove addresses that aren't in the parent. */
3048 for (ij = 0; ij < ppr->pr_ip6s; ij++)
3049 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
3050 &ppr->pr_ip6[ij]))
3051 break;
3052 if (ij < ppr->pr_ip6s)
3053 ii = 1;
3054 else {
3055 bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
3056 --pr->pr_ip6s * sizeof(*pr->pr_ip6));
3057 ii = 0;
3058 }
3059 for (ij = 1; ii < pr->pr_ip6s; ) {
3060 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
3061 &ppr->pr_ip6[0])) {
3062 ii++;
3063 continue;
3064 }
3065 switch (ij >= ppr->pr_ip6s ? -1 :
3066 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
3067 case -1:
3068 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
3069 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
3070 break;
3071 case 0:
3072 ii++;
3073 ij++;
3074 break;
3075 case 1:
3076 ij++;
3077 break;
3078 }
3079 }
3080 if (pr->pr_ip6s == 0) {
3081 pr->pr_flags |= PR_IP6_DISABLE;
3082 free(pr->pr_ip6, M_PRISON);
3083 pr->pr_ip6 = NULL;
3084 }
3085 }
3086 return 0;
3087 }
3088
3089 /*
3090 * Pass back primary IPv6 address for this jail.
3091 *
3092 * If not restricted return success but do not alter the address. Caller has
3093 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
3094 *
3095 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3096 */
3097 int
prison_get_ip6(struct ucred * cred,struct in6_addr * ia6)3098 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
3099 {
3100 struct prison *pr;
3101
3102 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3103 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3104
3105 pr = cred->cr_prison;
3106 if (!(pr->pr_flags & PR_IP6))
3107 return (0);
3108 mtx_lock(&pr->pr_mtx);
3109 if (!(pr->pr_flags & PR_IP6)) {
3110 mtx_unlock(&pr->pr_mtx);
3111 return (0);
3112 }
3113 if (pr->pr_ip6 == NULL) {
3114 mtx_unlock(&pr->pr_mtx);
3115 return (EAFNOSUPPORT);
3116 }
3117
3118 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3119 mtx_unlock(&pr->pr_mtx);
3120 return (0);
3121 }
3122
3123 /*
3124 * Return 1 if we should do proper source address selection or are not jailed.
3125 * We will return 0 if we should bypass source address selection in favour
3126 * of the primary jail IPv6 address. Only in this case *ia will be updated and
3127 * returned in NBO.
3128 * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
3129 */
3130 int
prison_saddrsel_ip6(struct ucred * cred,struct in6_addr * ia6)3131 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
3132 {
3133 struct prison *pr;
3134 struct in6_addr lia6;
3135 int error;
3136
3137 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3138 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3139
3140 if (!jailed(cred))
3141 return (1);
3142
3143 pr = cred->cr_prison;
3144 if (pr->pr_flags & PR_IP6_SADDRSEL)
3145 return (1);
3146
3147 lia6 = in6addr_any;
3148 error = prison_get_ip6(cred, &lia6);
3149 if (error)
3150 return (error);
3151 if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
3152 return (1);
3153
3154 bcopy(&lia6, ia6, sizeof(struct in6_addr));
3155 return (0);
3156 }
3157
3158 /*
3159 * Return true if pr1 and pr2 have the same IPv6 address restrictions.
3160 */
3161 int
prison_equal_ip6(struct prison * pr1,struct prison * pr2)3162 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
3163 {
3164
3165 if (pr1 == pr2)
3166 return (1);
3167
3168 while (pr1 != &prison0 &&
3169 #ifdef VIMAGE
3170 !(pr1->pr_flags & PR_VNET) &&
3171 #endif
3172 !(pr1->pr_flags & PR_IP6_USER))
3173 pr1 = pr1->pr_parent;
3174 while (pr2 != &prison0 &&
3175 #ifdef VIMAGE
3176 !(pr2->pr_flags & PR_VNET) &&
3177 #endif
3178 !(pr2->pr_flags & PR_IP6_USER))
3179 pr2 = pr2->pr_parent;
3180 return (pr1 == pr2);
3181 }
3182
3183 /*
3184 * Make sure our (source) address is set to something meaningful to this jail.
3185 *
3186 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
3187 * when needed while binding.
3188 *
3189 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3190 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3191 * doesn't allow IPv6.
3192 */
3193 int
prison_local_ip6(struct ucred * cred,struct in6_addr * ia6,int v6only)3194 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
3195 {
3196 struct prison *pr;
3197 int error;
3198
3199 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3200 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3201
3202 pr = cred->cr_prison;
3203 if (!(pr->pr_flags & PR_IP6))
3204 return (0);
3205 mtx_lock(&pr->pr_mtx);
3206 if (!(pr->pr_flags & PR_IP6)) {
3207 mtx_unlock(&pr->pr_mtx);
3208 return (0);
3209 }
3210 if (pr->pr_ip6 == NULL) {
3211 mtx_unlock(&pr->pr_mtx);
3212 return (EAFNOSUPPORT);
3213 }
3214
3215 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3216 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3217 mtx_unlock(&pr->pr_mtx);
3218 return (0);
3219 }
3220
3221 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
3222 /*
3223 * In case there is only 1 IPv6 address, and v6only is true,
3224 * then bind directly.
3225 */
3226 if (v6only != 0 && pr->pr_ip6s == 1)
3227 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3228 mtx_unlock(&pr->pr_mtx);
3229 return (0);
3230 }
3231
3232 error = _prison_check_ip6(pr, ia6);
3233 mtx_unlock(&pr->pr_mtx);
3234 return (error);
3235 }
3236
3237 /*
3238 * Rewrite destination address in case we will connect to loopback address.
3239 *
3240 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
3241 */
3242 int
prison_remote_ip6(struct ucred * cred,struct in6_addr * ia6)3243 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
3244 {
3245 struct prison *pr;
3246
3247 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3248 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3249
3250 pr = cred->cr_prison;
3251 if (!(pr->pr_flags & PR_IP6))
3252 return (0);
3253 mtx_lock(&pr->pr_mtx);
3254 if (!(pr->pr_flags & PR_IP6)) {
3255 mtx_unlock(&pr->pr_mtx);
3256 return (0);
3257 }
3258 if (pr->pr_ip6 == NULL) {
3259 mtx_unlock(&pr->pr_mtx);
3260 return (EAFNOSUPPORT);
3261 }
3262
3263 if (IN6_IS_ADDR_LOOPBACK(ia6)) {
3264 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
3265 mtx_unlock(&pr->pr_mtx);
3266 return (0);
3267 }
3268
3269 /*
3270 * Return success because nothing had to be changed.
3271 */
3272 mtx_unlock(&pr->pr_mtx);
3273 return (0);
3274 }
3275
3276 /*
3277 * Check if given address belongs to the jail referenced by cred/prison.
3278 *
3279 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
3280 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
3281 * doesn't allow IPv6.
3282 */
3283 static int
_prison_check_ip6(struct prison * pr,struct in6_addr * ia6)3284 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6)
3285 {
3286 int i, a, z, d;
3287
3288 /*
3289 * Check the primary IP.
3290 */
3291 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
3292 return (0);
3293
3294 /*
3295 * All the other IPs are sorted so we can do a binary search.
3296 */
3297 a = 0;
3298 z = pr->pr_ip6s - 2;
3299 while (a <= z) {
3300 i = (a + z) / 2;
3301 d = qcmp_v6(&pr->pr_ip6[i+1], ia6);
3302 if (d > 0)
3303 z = i - 1;
3304 else if (d < 0)
3305 a = i + 1;
3306 else
3307 return (0);
3308 }
3309
3310 return (EADDRNOTAVAIL);
3311 }
3312
3313 int
prison_check_ip6(struct ucred * cred,struct in6_addr * ia6)3314 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6)
3315 {
3316 struct prison *pr;
3317 int error;
3318
3319 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3320 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
3321
3322 pr = cred->cr_prison;
3323 if (!(pr->pr_flags & PR_IP6))
3324 return (0);
3325 mtx_lock(&pr->pr_mtx);
3326 if (!(pr->pr_flags & PR_IP6)) {
3327 mtx_unlock(&pr->pr_mtx);
3328 return (0);
3329 }
3330 if (pr->pr_ip6 == NULL) {
3331 mtx_unlock(&pr->pr_mtx);
3332 return (EAFNOSUPPORT);
3333 }
3334
3335 error = _prison_check_ip6(pr, ia6);
3336 mtx_unlock(&pr->pr_mtx);
3337 return (error);
3338 }
3339 #endif
3340
3341 /*
3342 * Check if a jail supports the given address family.
3343 *
3344 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
3345 * if not.
3346 */
3347 int
prison_check_af(struct ucred * cred,int af)3348 prison_check_af(struct ucred *cred, int af)
3349 {
3350 struct prison *pr;
3351 int error;
3352
3353 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3354
3355 pr = cred->cr_prison;
3356 #ifdef VIMAGE
3357 /* Prisons with their own network stack are not limited. */
3358 if (prison_owns_vnet(cred))
3359 return (0);
3360 #endif
3361
3362 error = 0;
3363 switch (af)
3364 {
3365 #ifdef INET
3366 case AF_INET:
3367 if (pr->pr_flags & PR_IP4)
3368 {
3369 mtx_lock(&pr->pr_mtx);
3370 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
3371 error = EAFNOSUPPORT;
3372 mtx_unlock(&pr->pr_mtx);
3373 }
3374 break;
3375 #endif
3376 #ifdef INET6
3377 case AF_INET6:
3378 if (pr->pr_flags & PR_IP6)
3379 {
3380 mtx_lock(&pr->pr_mtx);
3381 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
3382 error = EAFNOSUPPORT;
3383 mtx_unlock(&pr->pr_mtx);
3384 }
3385 break;
3386 #endif
3387 case AF_LOCAL:
3388 case AF_ROUTE:
3389 break;
3390 default:
3391 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
3392 error = EAFNOSUPPORT;
3393 }
3394 return (error);
3395 }
3396
3397 /*
3398 * Check if given address belongs to the jail referenced by cred (wrapper to
3399 * prison_check_ip[46]).
3400 *
3401 * Returns 0 if jail doesn't restrict the address family or if address belongs
3402 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
3403 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
3404 */
3405 int
prison_if(struct ucred * cred,struct sockaddr * sa)3406 prison_if(struct ucred *cred, struct sockaddr *sa)
3407 {
3408 #ifdef INET
3409 struct sockaddr_in *sai;
3410 #endif
3411 #ifdef INET6
3412 struct sockaddr_in6 *sai6;
3413 #endif
3414 int error;
3415
3416 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3417 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
3418
3419 #ifdef VIMAGE
3420 if (prison_owns_vnet(cred))
3421 return (0);
3422 #endif
3423
3424 error = 0;
3425 switch (sa->sa_family)
3426 {
3427 #ifdef INET
3428 case AF_INET:
3429 sai = (struct sockaddr_in *)sa;
3430 error = prison_check_ip4(cred, &sai->sin_addr);
3431 break;
3432 #endif
3433 #ifdef INET6
3434 case AF_INET6:
3435 sai6 = (struct sockaddr_in6 *)sa;
3436 error = prison_check_ip6(cred, &sai6->sin6_addr);
3437 break;
3438 #endif
3439 default:
3440 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
3441 error = EAFNOSUPPORT;
3442 }
3443 return (error);
3444 }
3445
3446 /*
3447 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
3448 */
3449 int
prison_check(struct ucred * cred1,struct ucred * cred2)3450 prison_check(struct ucred *cred1, struct ucred *cred2)
3451 {
3452
3453 return ((cred1->cr_prison == cred2->cr_prison ||
3454 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
3455 }
3456
3457 /*
3458 * Return 1 if p2 is a child of p1, otherwise 0.
3459 */
3460 int
prison_ischild(struct prison * pr1,struct prison * pr2)3461 prison_ischild(struct prison *pr1, struct prison *pr2)
3462 {
3463
3464 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
3465 if (pr1 == pr2)
3466 return (1);
3467 return (0);
3468 }
3469
3470 /*
3471 * Return 1 if the passed credential is in a jail, otherwise 0.
3472 */
3473 int
jailed(struct ucred * cred)3474 jailed(struct ucred *cred)
3475 {
3476
3477 return (cred->cr_prison != &prison0);
3478 }
3479
3480 /*
3481 * Return 1 if the passed credential is in a jail and that jail does not
3482 * have its own virtual network stack, otherwise 0.
3483 */
3484 int
jailed_without_vnet(struct ucred * cred)3485 jailed_without_vnet(struct ucred *cred)
3486 {
3487
3488 if (!jailed(cred))
3489 return (0);
3490 #ifdef VIMAGE
3491 if (prison_owns_vnet(cred))
3492 return (0);
3493 #endif
3494
3495 return (1);
3496 }
3497
3498 /*
3499 * Return the correct hostname (domainname, et al) for the passed credential.
3500 */
3501 void
getcredhostname(struct ucred * cred,char * buf,size_t size)3502 getcredhostname(struct ucred *cred, char *buf, size_t size)
3503 {
3504 struct prison *pr;
3505
3506 /*
3507 * A NULL credential can be used to shortcut to the physical
3508 * system's hostname.
3509 */
3510 pr = (cred != NULL) ? cred->cr_prison : &prison0;
3511 mtx_lock(&pr->pr_mtx);
3512 strlcpy(buf, pr->pr_hostname, size);
3513 mtx_unlock(&pr->pr_mtx);
3514 }
3515
3516 void
getcreddomainname(struct ucred * cred,char * buf,size_t size)3517 getcreddomainname(struct ucred *cred, char *buf, size_t size)
3518 {
3519
3520 mtx_lock(&cred->cr_prison->pr_mtx);
3521 strlcpy(buf, cred->cr_prison->pr_domainname, size);
3522 mtx_unlock(&cred->cr_prison->pr_mtx);
3523 }
3524
3525 void
getcredhostuuid(struct ucred * cred,char * buf,size_t size)3526 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
3527 {
3528
3529 mtx_lock(&cred->cr_prison->pr_mtx);
3530 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
3531 mtx_unlock(&cred->cr_prison->pr_mtx);
3532 }
3533
3534 void
getcredhostid(struct ucred * cred,unsigned long * hostid)3535 getcredhostid(struct ucred *cred, unsigned long *hostid)
3536 {
3537
3538 mtx_lock(&cred->cr_prison->pr_mtx);
3539 *hostid = cred->cr_prison->pr_hostid;
3540 mtx_unlock(&cred->cr_prison->pr_mtx);
3541 }
3542
3543 #ifdef VIMAGE
3544 /*
3545 * Determine whether the prison represented by cred owns
3546 * its vnet rather than having it inherited.
3547 *
3548 * Returns 1 in case the prison owns the vnet, 0 otherwise.
3549 */
3550 int
prison_owns_vnet(struct ucred * cred)3551 prison_owns_vnet(struct ucred *cred)
3552 {
3553
3554 /*
3555 * vnets cannot be added/removed after jail creation,
3556 * so no need to lock here.
3557 */
3558 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
3559 }
3560 #endif
3561
3562 /*
3563 * Determine whether the subject represented by cred can "see"
3564 * status of a mount point.
3565 * Returns: 0 for permitted, ENOENT otherwise.
3566 * XXX: This function should be called cr_canseemount() and should be
3567 * placed in kern_prot.c.
3568 */
3569 int
prison_canseemount(struct ucred * cred,struct mount * mp)3570 prison_canseemount(struct ucred *cred, struct mount *mp)
3571 {
3572 struct prison *pr;
3573 struct statfs *sp;
3574 size_t len;
3575
3576 pr = cred->cr_prison;
3577 if (pr->pr_enforce_statfs == 0)
3578 return (0);
3579 if (pr->pr_root->v_mount == mp)
3580 return (0);
3581 if (pr->pr_enforce_statfs == 2)
3582 return (ENOENT);
3583 /*
3584 * If jail's chroot directory is set to "/" we should be able to see
3585 * all mount-points from inside a jail.
3586 * This is ugly check, but this is the only situation when jail's
3587 * directory ends with '/'.
3588 */
3589 if (strcmp(pr->pr_path, "/") == 0)
3590 return (0);
3591 len = strlen(pr->pr_path);
3592 sp = &mp->mnt_stat;
3593 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
3594 return (ENOENT);
3595 /*
3596 * Be sure that we don't have situation where jail's root directory
3597 * is "/some/path" and mount point is "/some/pathpath".
3598 */
3599 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
3600 return (ENOENT);
3601 return (0);
3602 }
3603
3604 void
prison_enforce_statfs(struct ucred * cred,struct mount * mp,struct statfs * sp)3605 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
3606 {
3607 char jpath[MAXPATHLEN];
3608 struct prison *pr;
3609 size_t len;
3610
3611 pr = cred->cr_prison;
3612 if (pr->pr_enforce_statfs == 0)
3613 return;
3614 if (prison_canseemount(cred, mp) != 0) {
3615 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3616 strlcpy(sp->f_mntonname, "[restricted]",
3617 sizeof(sp->f_mntonname));
3618 return;
3619 }
3620 if (pr->pr_root->v_mount == mp) {
3621 /*
3622 * Clear current buffer data, so we are sure nothing from
3623 * the valid path left there.
3624 */
3625 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3626 *sp->f_mntonname = '/';
3627 return;
3628 }
3629 /*
3630 * If jail's chroot directory is set to "/" we should be able to see
3631 * all mount-points from inside a jail.
3632 */
3633 if (strcmp(pr->pr_path, "/") == 0)
3634 return;
3635 len = strlen(pr->pr_path);
3636 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
3637 /*
3638 * Clear current buffer data, so we are sure nothing from
3639 * the valid path left there.
3640 */
3641 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3642 if (*jpath == '\0') {
3643 /* Should never happen. */
3644 *sp->f_mntonname = '/';
3645 } else {
3646 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
3647 }
3648 }
3649
3650 /*
3651 * Check with permission for a specific privilege is granted within jail. We
3652 * have a specific list of accepted privileges; the rest are denied.
3653 */
3654 int
prison_priv_check(struct ucred * cred,int priv)3655 prison_priv_check(struct ucred *cred, int priv)
3656 {
3657
3658 if (!jailed(cred))
3659 return (0);
3660
3661 #ifdef VIMAGE
3662 /*
3663 * Privileges specific to prisons with a virtual network stack.
3664 * There might be a duplicate entry here in case the privilege
3665 * is only granted conditionally in the legacy jail case.
3666 */
3667 switch (priv) {
3668 #ifdef notyet
3669 /*
3670 * NFS-specific privileges.
3671 */
3672 case PRIV_NFS_DAEMON:
3673 case PRIV_NFS_LOCKD:
3674 #endif
3675 /*
3676 * Network stack privileges.
3677 */
3678 case PRIV_NET_BRIDGE:
3679 case PRIV_NET_GRE:
3680 case PRIV_NET_BPF:
3681 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
3682 case PRIV_NET_ROUTE:
3683 case PRIV_NET_TAP:
3684 case PRIV_NET_SETIFMTU:
3685 case PRIV_NET_SETIFFLAGS:
3686 case PRIV_NET_SETIFCAP:
3687 case PRIV_NET_SETIFDESCR:
3688 case PRIV_NET_SETIFNAME :
3689 case PRIV_NET_SETIFMETRIC:
3690 case PRIV_NET_SETIFPHYS:
3691 case PRIV_NET_SETIFMAC:
3692 case PRIV_NET_ADDMULTI:
3693 case PRIV_NET_DELMULTI:
3694 case PRIV_NET_HWIOCTL:
3695 case PRIV_NET_SETLLADDR:
3696 case PRIV_NET_ADDIFGROUP:
3697 case PRIV_NET_DELIFGROUP:
3698 case PRIV_NET_IFCREATE:
3699 case PRIV_NET_IFDESTROY:
3700 case PRIV_NET_ADDIFADDR:
3701 case PRIV_NET_DELIFADDR:
3702 case PRIV_NET_LAGG:
3703 case PRIV_NET_GIF:
3704 case PRIV_NET_SETIFVNET:
3705 case PRIV_NET_SETIFFIB:
3706
3707 /*
3708 * 802.11-related privileges.
3709 */
3710 case PRIV_NET80211_GETKEY:
3711 #ifdef notyet
3712 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */
3713 #endif
3714
3715 #ifdef notyet
3716 /*
3717 * AppleTalk privileges.
3718 */
3719 case PRIV_NETATALK_RESERVEDPORT:
3720
3721 /*
3722 * ATM privileges.
3723 */
3724 case PRIV_NETATM_CFG:
3725 case PRIV_NETATM_ADD:
3726 case PRIV_NETATM_DEL:
3727 case PRIV_NETATM_SET:
3728
3729 /*
3730 * Bluetooth privileges.
3731 */
3732 case PRIV_NETBLUETOOTH_RAW:
3733 #endif
3734
3735 /*
3736 * Netgraph and netgraph module privileges.
3737 */
3738 case PRIV_NETGRAPH_CONTROL:
3739 #ifdef notyet
3740 case PRIV_NETGRAPH_TTY:
3741 #endif
3742
3743 /*
3744 * IPv4 and IPv6 privileges.
3745 */
3746 case PRIV_NETINET_IPFW:
3747 case PRIV_NETINET_DIVERT:
3748 case PRIV_NETINET_PF:
3749 case PRIV_NETINET_DUMMYNET:
3750 case PRIV_NETINET_CARP:
3751 case PRIV_NETINET_MROUTE:
3752 case PRIV_NETINET_RAW:
3753 case PRIV_NETINET_ADDRCTRL6:
3754 case PRIV_NETINET_ND6:
3755 case PRIV_NETINET_SCOPE6:
3756 case PRIV_NETINET_ALIFETIME6:
3757 case PRIV_NETINET_IPSEC:
3758 case PRIV_NETINET_BINDANY:
3759
3760 #ifdef notyet
3761 /*
3762 * IPX/SPX privileges.
3763 */
3764 case PRIV_NETIPX_RESERVEDPORT:
3765 case PRIV_NETIPX_RAW:
3766
3767 /*
3768 * NCP privileges.
3769 */
3770 case PRIV_NETNCP:
3771
3772 /*
3773 * SMB privileges.
3774 */
3775 case PRIV_NETSMB:
3776 #endif
3777
3778 /*
3779 * No default: or deny here.
3780 * In case of no permit fall through to next switch().
3781 */
3782 if (cred->cr_prison->pr_flags & PR_VNET)
3783 return (0);
3784 }
3785 #endif /* VIMAGE */
3786
3787 switch (priv) {
3788
3789 /*
3790 * Allow ktrace privileges for root in jail.
3791 */
3792 case PRIV_KTRACE:
3793
3794 #if 0
3795 /*
3796 * Allow jailed processes to configure audit identity and
3797 * submit audit records (login, etc). In the future we may
3798 * want to further refine the relationship between audit and
3799 * jail.
3800 */
3801 case PRIV_AUDIT_GETAUDIT:
3802 case PRIV_AUDIT_SETAUDIT:
3803 case PRIV_AUDIT_SUBMIT:
3804 #endif
3805
3806 /*
3807 * Allow jailed processes to manipulate process UNIX
3808 * credentials in any way they see fit.
3809 */
3810 case PRIV_CRED_SETUID:
3811 case PRIV_CRED_SETEUID:
3812 case PRIV_CRED_SETGID:
3813 case PRIV_CRED_SETEGID:
3814 case PRIV_CRED_SETGROUPS:
3815 case PRIV_CRED_SETREUID:
3816 case PRIV_CRED_SETREGID:
3817 case PRIV_CRED_SETRESUID:
3818 case PRIV_CRED_SETRESGID:
3819
3820 /*
3821 * Jail implements visibility constraints already, so allow
3822 * jailed root to override uid/gid-based constraints.
3823 */
3824 case PRIV_SEEOTHERGIDS:
3825 case PRIV_SEEOTHERUIDS:
3826
3827 /*
3828 * Jail implements inter-process debugging limits already, so
3829 * allow jailed root various debugging privileges.
3830 */
3831 case PRIV_DEBUG_DIFFCRED:
3832 case PRIV_DEBUG_SUGID:
3833 case PRIV_DEBUG_UNPRIV:
3834
3835 /*
3836 * Allow jail to set various resource limits and login
3837 * properties, and for now, exceed process resource limits.
3838 */
3839 case PRIV_PROC_LIMIT:
3840 case PRIV_PROC_SETLOGIN:
3841 case PRIV_PROC_SETRLIMIT:
3842
3843 /*
3844 * System V and POSIX IPC privileges are granted in jail.
3845 */
3846 case PRIV_IPC_READ:
3847 case PRIV_IPC_WRITE:
3848 case PRIV_IPC_ADMIN:
3849 case PRIV_IPC_MSGSIZE:
3850 case PRIV_MQ_ADMIN:
3851
3852 /*
3853 * Jail operations within a jail work on child jails.
3854 */
3855 case PRIV_JAIL_ATTACH:
3856 case PRIV_JAIL_SET:
3857 case PRIV_JAIL_REMOVE:
3858
3859 /*
3860 * Jail implements its own inter-process limits, so allow
3861 * root processes in jail to change scheduling on other
3862 * processes in the same jail. Likewise for signalling.
3863 */
3864 case PRIV_SCHED_DIFFCRED:
3865 case PRIV_SCHED_CPUSET:
3866 case PRIV_SIGNAL_DIFFCRED:
3867 case PRIV_SIGNAL_SUGID:
3868
3869 /*
3870 * Allow jailed processes to write to sysctls marked as jail
3871 * writable.
3872 */
3873 case PRIV_SYSCTL_WRITEJAIL:
3874
3875 /*
3876 * Allow root in jail to manage a variety of quota
3877 * properties. These should likely be conditional on a
3878 * configuration option.
3879 */
3880 case PRIV_VFS_GETQUOTA:
3881 case PRIV_VFS_SETQUOTA:
3882
3883 /*
3884 * Since Jail relies on chroot() to implement file system
3885 * protections, grant many VFS privileges to root in jail.
3886 * Be careful to exclude mount-related and NFS-related
3887 * privileges.
3888 */
3889 case PRIV_VFS_READ:
3890 case PRIV_VFS_WRITE:
3891 case PRIV_VFS_ADMIN:
3892 case PRIV_VFS_EXEC:
3893 case PRIV_VFS_LOOKUP:
3894 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
3895 case PRIV_VFS_CHFLAGS_DEV:
3896 case PRIV_VFS_CHOWN:
3897 case PRIV_VFS_CHROOT:
3898 case PRIV_VFS_RETAINSUGID:
3899 case PRIV_VFS_FCHROOT:
3900 case PRIV_VFS_LINK:
3901 case PRIV_VFS_SETGID:
3902 case PRIV_VFS_STAT:
3903 case PRIV_VFS_STICKYFILE:
3904 return (0);
3905
3906 /*
3907 * Depending on the global setting, allow privilege of
3908 * setting system flags.
3909 */
3910 case PRIV_VFS_SYSFLAGS:
3911 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
3912 return (0);
3913 else
3914 return (EPERM);
3915
3916 /*
3917 * Depending on the global setting, allow privilege of
3918 * mounting/unmounting file systems.
3919 */
3920 case PRIV_VFS_MOUNT:
3921 case PRIV_VFS_UNMOUNT:
3922 case PRIV_VFS_MOUNT_NONUSER:
3923 case PRIV_VFS_MOUNT_OWNER:
3924 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT &&
3925 cred->cr_prison->pr_enforce_statfs < 2)
3926 return (0);
3927 else
3928 return (EPERM);
3929
3930 /*
3931 * Allow jailed root to bind reserved ports and reuse in-use
3932 * ports.
3933 */
3934 case PRIV_NETINET_RESERVEDPORT:
3935 case PRIV_NETINET_REUSEPORT:
3936 return (0);
3937
3938 /*
3939 * Allow jailed root to set certian IPv4/6 (option) headers.
3940 */
3941 case PRIV_NETINET_SETHDROPTS:
3942 return (0);
3943
3944 /*
3945 * Conditionally allow creating raw sockets in jail.
3946 */
3947 case PRIV_NETINET_RAW:
3948 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
3949 return (0);
3950 else
3951 return (EPERM);
3952
3953 /*
3954 * Since jail implements its own visibility limits on netstat
3955 * sysctls, allow getcred. This allows identd to work in
3956 * jail.
3957 */
3958 case PRIV_NETINET_GETCRED:
3959 return (0);
3960
3961 /*
3962 * Allow jailed root to set loginclass.
3963 */
3964 case PRIV_PROC_SETLOGINCLASS:
3965 return (0);
3966
3967 default:
3968 /*
3969 * In all remaining cases, deny the privilege request. This
3970 * includes almost all network privileges, many system
3971 * configuration privileges.
3972 */
3973 return (EPERM);
3974 }
3975 }
3976
3977 /*
3978 * Return the part of pr2's name that is relative to pr1, or the whole name
3979 * if it does not directly follow.
3980 */
3981
3982 char *
prison_name(struct prison * pr1,struct prison * pr2)3983 prison_name(struct prison *pr1, struct prison *pr2)
3984 {
3985 char *name;
3986
3987 /* Jails see themselves as "0" (if they see themselves at all). */
3988 if (pr1 == pr2)
3989 return "0";
3990 name = pr2->pr_name;
3991 if (prison_ischild(pr1, pr2)) {
3992 /*
3993 * pr1 isn't locked (and allprison_lock may not be either)
3994 * so its length can't be counted on. But the number of dots
3995 * can be counted on - and counted.
3996 */
3997 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
3998 name = strchr(name, '.') + 1;
3999 }
4000 return (name);
4001 }
4002
4003 /*
4004 * Return the part of pr2's path that is relative to pr1, or the whole path
4005 * if it does not directly follow.
4006 */
4007 static char *
prison_path(struct prison * pr1,struct prison * pr2)4008 prison_path(struct prison *pr1, struct prison *pr2)
4009 {
4010 char *path1, *path2;
4011 int len1;
4012
4013 path1 = pr1->pr_path;
4014 path2 = pr2->pr_path;
4015 if (!strcmp(path1, "/"))
4016 return (path2);
4017 len1 = strlen(path1);
4018 if (strncmp(path1, path2, len1))
4019 return (path2);
4020 if (path2[len1] == '\0')
4021 return "/";
4022 if (path2[len1] == '/')
4023 return (path2 + len1);
4024 return (path2);
4025 }
4026
4027
4028 /*
4029 * Jail-related sysctls.
4030 */
4031 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
4032 "Jails");
4033
4034 static int
sysctl_jail_list(SYSCTL_HANDLER_ARGS)4035 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
4036 {
4037 struct xprison *xp;
4038 struct prison *pr, *cpr;
4039 #ifdef INET
4040 struct in_addr *ip4 = NULL;
4041 int ip4s = 0;
4042 #endif
4043 #ifdef INET6
4044 struct in6_addr *ip6 = NULL;
4045 int ip6s = 0;
4046 #endif
4047 int descend, error;
4048
4049 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
4050 pr = req->td->td_ucred->cr_prison;
4051 error = 0;
4052 sx_slock(&allprison_lock);
4053 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
4054 #if defined(INET) || defined(INET6)
4055 again:
4056 #endif
4057 mtx_lock(&cpr->pr_mtx);
4058 #ifdef INET
4059 if (cpr->pr_ip4s > 0) {
4060 if (ip4s < cpr->pr_ip4s) {
4061 ip4s = cpr->pr_ip4s;
4062 mtx_unlock(&cpr->pr_mtx);
4063 ip4 = realloc(ip4, ip4s *
4064 sizeof(struct in_addr), M_TEMP, M_WAITOK);
4065 goto again;
4066 }
4067 bcopy(cpr->pr_ip4, ip4,
4068 cpr->pr_ip4s * sizeof(struct in_addr));
4069 }
4070 #endif
4071 #ifdef INET6
4072 if (cpr->pr_ip6s > 0) {
4073 if (ip6s < cpr->pr_ip6s) {
4074 ip6s = cpr->pr_ip6s;
4075 mtx_unlock(&cpr->pr_mtx);
4076 ip6 = realloc(ip6, ip6s *
4077 sizeof(struct in6_addr), M_TEMP, M_WAITOK);
4078 goto again;
4079 }
4080 bcopy(cpr->pr_ip6, ip6,
4081 cpr->pr_ip6s * sizeof(struct in6_addr));
4082 }
4083 #endif
4084 if (cpr->pr_ref == 0) {
4085 mtx_unlock(&cpr->pr_mtx);
4086 continue;
4087 }
4088 bzero(xp, sizeof(*xp));
4089 xp->pr_version = XPRISON_VERSION;
4090 xp->pr_id = cpr->pr_id;
4091 xp->pr_state = cpr->pr_uref > 0
4092 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
4093 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
4094 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
4095 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
4096 #ifdef INET
4097 xp->pr_ip4s = cpr->pr_ip4s;
4098 #endif
4099 #ifdef INET6
4100 xp->pr_ip6s = cpr->pr_ip6s;
4101 #endif
4102 mtx_unlock(&cpr->pr_mtx);
4103 error = SYSCTL_OUT(req, xp, sizeof(*xp));
4104 if (error)
4105 break;
4106 #ifdef INET
4107 if (xp->pr_ip4s > 0) {
4108 error = SYSCTL_OUT(req, ip4,
4109 xp->pr_ip4s * sizeof(struct in_addr));
4110 if (error)
4111 break;
4112 }
4113 #endif
4114 #ifdef INET6
4115 if (xp->pr_ip6s > 0) {
4116 error = SYSCTL_OUT(req, ip6,
4117 xp->pr_ip6s * sizeof(struct in6_addr));
4118 if (error)
4119 break;
4120 }
4121 #endif
4122 }
4123 sx_sunlock(&allprison_lock);
4124 free(xp, M_TEMP);
4125 #ifdef INET
4126 free(ip4, M_TEMP);
4127 #endif
4128 #ifdef INET6
4129 free(ip6, M_TEMP);
4130 #endif
4131 return (error);
4132 }
4133
4134 SYSCTL_OID(_security_jail, OID_AUTO, list,
4135 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4136 sysctl_jail_list, "S", "List of active jails");
4137
4138 static int
sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)4139 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
4140 {
4141 int error, injail;
4142
4143 injail = jailed(req->td->td_ucred);
4144 error = SYSCTL_OUT(req, &injail, sizeof(injail));
4145
4146 return (error);
4147 }
4148
4149 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
4150 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4151 sysctl_jail_jailed, "I", "Process in jail?");
4152
4153 static int
sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)4154 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
4155 {
4156 int error, havevnet;
4157 #ifdef VIMAGE
4158 struct ucred *cred = req->td->td_ucred;
4159
4160 havevnet = jailed(cred) && prison_owns_vnet(cred);
4161 #else
4162 havevnet = 0;
4163 #endif
4164 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
4165
4166 return (error);
4167 }
4168
4169 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
4170 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4171 sysctl_jail_vnet, "I", "Jail owns VNET?");
4172
4173 #if defined(INET) || defined(INET6)
4174 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
4175 &jail_max_af_ips, 0,
4176 "Number of IP addresses a jail may have at most per address family");
4177 #endif
4178
4179 /*
4180 * Default parameters for jail(2) compatability. For historical reasons,
4181 * the sysctl names have varying similarity to the parameter names. Prisons
4182 * just see their own parameters, and can't change them.
4183 */
4184 static int
sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)4185 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
4186 {
4187 struct prison *pr;
4188 int allow, error, i;
4189
4190 pr = req->td->td_ucred->cr_prison;
4191 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
4192
4193 /* Get the current flag value, and convert it to a boolean. */
4194 i = (allow & arg2) ? 1 : 0;
4195 if (arg1 != NULL)
4196 i = !i;
4197 error = sysctl_handle_int(oidp, &i, 0, req);
4198 if (error || !req->newptr)
4199 return (error);
4200 i = i ? arg2 : 0;
4201 if (arg1 != NULL)
4202 i ^= arg2;
4203 /*
4204 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
4205 * for writing.
4206 */
4207 mtx_lock(&prison0.pr_mtx);
4208 jail_default_allow = (jail_default_allow & ~arg2) | i;
4209 mtx_unlock(&prison0.pr_mtx);
4210 return (0);
4211 }
4212
4213 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
4214 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4215 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
4216 "Processes in jail can set their hostnames");
4217 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
4218 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4219 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
4220 "Processes in jail are limited to creating UNIX/IP/route sockets only");
4221 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
4222 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4223 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
4224 "Processes in jail can use System V IPC primitives");
4225 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
4226 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4227 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
4228 "Prison root can create raw sockets");
4229 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
4230 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4231 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
4232 "Processes in jail can alter system file flags");
4233 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
4234 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4235 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
4236 "Processes in jail can mount/unmount jail-friendly file systems");
4237 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed,
4238 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4239 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I",
4240 "Processes in jail can mount the devfs file system");
4241 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed,
4242 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4243 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I",
4244 "Processes in jail can mount the nullfs file system");
4245 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed,
4246 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4247 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I",
4248 "Processes in jail can mount the procfs file system");
4249 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed,
4250 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4251 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I",
4252 "Processes in jail can mount the zfs file system");
4253
4254 static int
sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)4255 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
4256 {
4257 struct prison *pr;
4258 int level, error;
4259
4260 pr = req->td->td_ucred->cr_prison;
4261 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
4262 error = sysctl_handle_int(oidp, &level, 0, req);
4263 if (error || !req->newptr)
4264 return (error);
4265 *(int *)arg1 = level;
4266 return (0);
4267 }
4268
4269 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
4270 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4271 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
4272 sysctl_jail_default_level, "I",
4273 "Processes in jail cannot see all mounted file systems");
4274
4275 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
4276 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
4277 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
4278 sysctl_jail_default_level, "I",
4279 "Ruleset for the devfs filesystem in jail");
4280
4281 /*
4282 * Nodes to describe jail parameters. Maximum length of string parameters
4283 * is returned in the string itself, and the other parameters exist merely
4284 * to make themselves and their types known.
4285 */
4286 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0,
4287 "Jail parameters");
4288
4289 int
sysctl_jail_param(SYSCTL_HANDLER_ARGS)4290 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
4291 {
4292 int i;
4293 long l;
4294 size_t s;
4295 char numbuf[12];
4296
4297 switch (oidp->oid_kind & CTLTYPE)
4298 {
4299 case CTLTYPE_LONG:
4300 case CTLTYPE_ULONG:
4301 l = 0;
4302 #ifdef SCTL_MASK32
4303 if (!(req->flags & SCTL_MASK32))
4304 #endif
4305 return (SYSCTL_OUT(req, &l, sizeof(l)));
4306 case CTLTYPE_INT:
4307 case CTLTYPE_UINT:
4308 i = 0;
4309 return (SYSCTL_OUT(req, &i, sizeof(i)));
4310 case CTLTYPE_STRING:
4311 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
4312 return
4313 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
4314 case CTLTYPE_STRUCT:
4315 s = (size_t)arg2;
4316 return (SYSCTL_OUT(req, &s, sizeof(s)));
4317 }
4318 return (0);
4319 }
4320
4321 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
4322 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
4323 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
4324 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
4325 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
4326 "I", "Jail secure level");
4327 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
4328 "I", "Jail cannot see all mounted file systems");
4329 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
4330 "I", "Ruleset for in-jail devfs mounts");
4331 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
4332 "B", "Jail persistence");
4333 #ifdef VIMAGE
4334 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
4335 "E,jailsys", "Virtual network stack");
4336 #endif
4337 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
4338 "B", "Jail is in the process of shutting down");
4339
4340 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
4341 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
4342 "I", "Current number of child jails");
4343 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
4344 "I", "Maximum number of child jails");
4345
4346 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
4347 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
4348 "Jail hostname");
4349 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
4350 "Jail NIS domainname");
4351 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
4352 "Jail host UUID");
4353 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
4354 "LU", "Jail host ID");
4355
4356 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
4357 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
4358
4359 #ifdef INET
4360 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
4361 "Jail IPv4 address virtualization");
4362 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
4363 "S,in_addr,a", "Jail IPv4 addresses");
4364 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4365 "B", "Do (not) use IPv4 source address selection rather than the "
4366 "primary jail IPv4 address.");
4367 #endif
4368 #ifdef INET6
4369 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
4370 "Jail IPv6 address virtualization");
4371 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
4372 "S,in6_addr,a", "Jail IPv6 addresses");
4373 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4374 "B", "Do (not) use IPv6 source address selection rather than the "
4375 "primary jail IPv6 address.");
4376 #endif
4377
4378 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
4379 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
4380 "B", "Jail may set hostname");
4381 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
4382 "B", "Jail may use SYSV IPC");
4383 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
4384 "B", "Jail may create raw sockets");
4385 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
4386 "B", "Jail may alter system file flags");
4387 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
4388 "B", "Jail may set file quotas");
4389 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
4390 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
4391
4392 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
4393 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
4394 "B", "Jail may mount/unmount jail-friendly file systems in general");
4395 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW,
4396 "B", "Jail may mount the devfs file system");
4397 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW,
4398 "B", "Jail may mount the nullfs file system");
4399 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW,
4400 "B", "Jail may mount the procfs file system");
4401 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW,
4402 "B", "Jail may mount the zfs file system");
4403
4404 void
prison_racct_foreach(void (* callback)(struct racct * racct,void * arg2,void * arg3),void * arg2,void * arg3)4405 prison_racct_foreach(void (*callback)(struct racct *racct,
4406 void *arg2, void *arg3), void *arg2, void *arg3)
4407 {
4408 struct prison_racct *prr;
4409
4410 sx_slock(&allprison_lock);
4411 LIST_FOREACH(prr, &allprison_racct, prr_next)
4412 (callback)(prr->prr_racct, arg2, arg3);
4413 sx_sunlock(&allprison_lock);
4414 }
4415
4416 static struct prison_racct *
prison_racct_find_locked(const char * name)4417 prison_racct_find_locked(const char *name)
4418 {
4419 struct prison_racct *prr;
4420
4421 sx_assert(&allprison_lock, SA_XLOCKED);
4422
4423 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
4424 return (NULL);
4425
4426 LIST_FOREACH(prr, &allprison_racct, prr_next) {
4427 if (strcmp(name, prr->prr_name) != 0)
4428 continue;
4429
4430 /* Found prison_racct with a matching name? */
4431 prison_racct_hold(prr);
4432 return (prr);
4433 }
4434
4435 /* Add new prison_racct. */
4436 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
4437 racct_create(&prr->prr_racct);
4438
4439 strcpy(prr->prr_name, name);
4440 refcount_init(&prr->prr_refcount, 1);
4441 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
4442
4443 return (prr);
4444 }
4445
4446 struct prison_racct *
prison_racct_find(const char * name)4447 prison_racct_find(const char *name)
4448 {
4449 struct prison_racct *prr;
4450
4451 sx_xlock(&allprison_lock);
4452 prr = prison_racct_find_locked(name);
4453 sx_xunlock(&allprison_lock);
4454 return (prr);
4455 }
4456
4457 void
prison_racct_hold(struct prison_racct * prr)4458 prison_racct_hold(struct prison_racct *prr)
4459 {
4460
4461 refcount_acquire(&prr->prr_refcount);
4462 }
4463
4464 static void
prison_racct_free_locked(struct prison_racct * prr)4465 prison_racct_free_locked(struct prison_racct *prr)
4466 {
4467
4468 sx_assert(&allprison_lock, SA_XLOCKED);
4469
4470 if (refcount_release(&prr->prr_refcount)) {
4471 racct_destroy(&prr->prr_racct);
4472 LIST_REMOVE(prr, prr_next);
4473 free(prr, M_PRISON_RACCT);
4474 }
4475 }
4476
4477 void
prison_racct_free(struct prison_racct * prr)4478 prison_racct_free(struct prison_racct *prr)
4479 {
4480 int old;
4481
4482 sx_assert(&allprison_lock, SA_UNLOCKED);
4483
4484 old = prr->prr_refcount;
4485 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1))
4486 return;
4487
4488 sx_xlock(&allprison_lock);
4489 prison_racct_free_locked(prr);
4490 sx_xunlock(&allprison_lock);
4491 }
4492
4493 #ifdef RACCT
4494 static void
prison_racct_attach(struct prison * pr)4495 prison_racct_attach(struct prison *pr)
4496 {
4497 struct prison_racct *prr;
4498
4499 sx_assert(&allprison_lock, SA_XLOCKED);
4500
4501 prr = prison_racct_find_locked(pr->pr_name);
4502 KASSERT(prr != NULL, ("cannot find prison_racct"));
4503
4504 pr->pr_prison_racct = prr;
4505 }
4506
4507 /*
4508 * Handle jail renaming. From the racct point of view, renaming means
4509 * moving from one prison_racct to another.
4510 */
4511 static void
prison_racct_modify(struct prison * pr)4512 prison_racct_modify(struct prison *pr)
4513 {
4514 struct proc *p;
4515 struct ucred *cred;
4516 struct prison_racct *oldprr;
4517
4518 sx_slock(&allproc_lock);
4519 sx_xlock(&allprison_lock);
4520
4521 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
4522 sx_xunlock(&allprison_lock);
4523 sx_sunlock(&allproc_lock);
4524 return;
4525 }
4526
4527 oldprr = pr->pr_prison_racct;
4528 pr->pr_prison_racct = NULL;
4529
4530 prison_racct_attach(pr);
4531
4532 /*
4533 * Move resource utilisation records.
4534 */
4535 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
4536
4537 /*
4538 * Force rctl to reattach rules to processes.
4539 */
4540 FOREACH_PROC_IN_SYSTEM(p) {
4541 PROC_LOCK(p);
4542 cred = crhold(p->p_ucred);
4543 PROC_UNLOCK(p);
4544 racct_proc_ucred_changed(p, cred, cred);
4545 crfree(cred);
4546 }
4547
4548 sx_sunlock(&allproc_lock);
4549 prison_racct_free_locked(oldprr);
4550 sx_xunlock(&allprison_lock);
4551 }
4552
4553 static void
prison_racct_detach(struct prison * pr)4554 prison_racct_detach(struct prison *pr)
4555 {
4556
4557 sx_assert(&allprison_lock, SA_UNLOCKED);
4558
4559 if (pr->pr_prison_racct == NULL)
4560 return;
4561 prison_racct_free(pr->pr_prison_racct);
4562 pr->pr_prison_racct = NULL;
4563 }
4564 #endif /* RACCT */
4565
4566 #ifdef DDB
4567
4568 static void
db_show_prison(struct prison * pr)4569 db_show_prison(struct prison *pr)
4570 {
4571 int fi;
4572 #if defined(INET) || defined(INET6)
4573 int ii;
4574 #endif
4575 unsigned jsf;
4576 #ifdef INET6
4577 char ip6buf[INET6_ADDRSTRLEN];
4578 #endif
4579
4580 db_printf("prison %p:\n", pr);
4581 db_printf(" jid = %d\n", pr->pr_id);
4582 db_printf(" name = %s\n", pr->pr_name);
4583 db_printf(" parent = %p\n", pr->pr_parent);
4584 db_printf(" ref = %d\n", pr->pr_ref);
4585 db_printf(" uref = %d\n", pr->pr_uref);
4586 db_printf(" path = %s\n", pr->pr_path);
4587 db_printf(" cpuset = %d\n", pr->pr_cpuset
4588 ? pr->pr_cpuset->cs_id : -1);
4589 #ifdef VIMAGE
4590 db_printf(" vnet = %p\n", pr->pr_vnet);
4591 #endif
4592 db_printf(" root = %p\n", pr->pr_root);
4593 db_printf(" securelevel = %d\n", pr->pr_securelevel);
4594 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
4595 db_printf(" children.max = %d\n", pr->pr_childmax);
4596 db_printf(" children.cur = %d\n", pr->pr_childcount);
4597 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
4598 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
4599 db_printf(" flags = 0x%x", pr->pr_flags);
4600 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
4601 fi++)
4602 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi)))
4603 db_printf(" %s", pr_flag_names[fi]);
4604 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
4605 fi++) {
4606 jsf = pr->pr_flags &
4607 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
4608 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name,
4609 pr_flag_jailsys[fi].disable &&
4610 (jsf == pr_flag_jailsys[fi].disable) ? "disable"
4611 : (jsf == pr_flag_jailsys[fi].new) ? "new"
4612 : "inherit");
4613 }
4614 db_printf(" allow = 0x%x", pr->pr_allow);
4615 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
4616 fi++)
4617 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi)))
4618 db_printf(" %s", pr_allow_names[fi]);
4619 db_printf("\n");
4620 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
4621 db_printf(" host.hostname = %s\n", pr->pr_hostname);
4622 db_printf(" host.domainname = %s\n", pr->pr_domainname);
4623 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
4624 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
4625 #ifdef INET
4626 db_printf(" ip4s = %d\n", pr->pr_ip4s);
4627 for (ii = 0; ii < pr->pr_ip4s; ii++)
4628 db_printf(" %s %s\n",
4629 ii == 0 ? "ip4.addr =" : " ",
4630 inet_ntoa(pr->pr_ip4[ii]));
4631 #endif
4632 #ifdef INET6
4633 db_printf(" ip6s = %d\n", pr->pr_ip6s);
4634 for (ii = 0; ii < pr->pr_ip6s; ii++)
4635 db_printf(" %s %s\n",
4636 ii == 0 ? "ip6.addr =" : " ",
4637 ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
4638 #endif
4639 }
4640
DB_SHOW_COMMAND(prison,db_show_prison_command)4641 DB_SHOW_COMMAND(prison, db_show_prison_command)
4642 {
4643 struct prison *pr;
4644
4645 if (!have_addr) {
4646 /*
4647 * Show all prisons in the list, and prison0 which is not
4648 * listed.
4649 */
4650 db_show_prison(&prison0);
4651 if (!db_pager_quit) {
4652 TAILQ_FOREACH(pr, &allprison, pr_list) {
4653 db_show_prison(pr);
4654 if (db_pager_quit)
4655 break;
4656 }
4657 }
4658 return;
4659 }
4660
4661 if (addr == 0)
4662 pr = &prison0;
4663 else {
4664 /* Look for a prison with the ID and with references. */
4665 TAILQ_FOREACH(pr, &allprison, pr_list)
4666 if (pr->pr_id == addr && pr->pr_ref > 0)
4667 break;
4668 if (pr == NULL)
4669 /* Look again, without requiring a reference. */
4670 TAILQ_FOREACH(pr, &allprison, pr_list)
4671 if (pr->pr_id == addr)
4672 break;
4673 if (pr == NULL)
4674 /* Assume address points to a valid prison. */
4675 pr = (struct prison *)addr;
4676 }
4677 db_show_prison(pr);
4678 }
4679
4680 #endif /* DDB */
4681