1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1999 Poul-Henning Kamp. 5 * Copyright (c) 2008 Bjoern A. Zeeb. 6 * Copyright (c) 2009 James Gritton. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include "opt_ddb.h" 35 #include "opt_inet.h" 36 #include "opt_inet6.h" 37 38 #include <sys/param.h> 39 #include <sys/types.h> 40 #include <sys/kernel.h> 41 #include <sys/systm.h> 42 #include <sys/errno.h> 43 #include <sys/sysproto.h> 44 #include <sys/malloc.h> 45 #include <sys/osd.h> 46 #include <sys/priv.h> 47 #include <sys/proc.h> 48 #include <sys/taskqueue.h> 49 #include <sys/fcntl.h> 50 #include <sys/jail.h> 51 #include <sys/linker.h> 52 #include <sys/lock.h> 53 #include <sys/mutex.h> 54 #include <sys/racct.h> 55 #include <sys/rctl.h> 56 #include <sys/refcount.h> 57 #include <sys/sx.h> 58 #include <sys/sysent.h> 59 #include <sys/namei.h> 60 #include <sys/mount.h> 61 #include <sys/queue.h> 62 #include <sys/socket.h> 63 #include <sys/syscallsubr.h> 64 #include <sys/sysctl.h> 65 #include <sys/uuid.h> 66 #include <sys/vnode.h> 67 68 #include <net/if.h> 69 #include <net/vnet.h> 70 71 #include <netinet/in.h> 72 73 #ifdef DDB 74 #include <ddb/ddb.h> 75 #endif /* DDB */ 76 77 #include <security/mac/mac_framework.h> 78 79 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 80 #define PRISON0_HOSTUUID_MODULE "hostuuid" 81 82 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 83 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 84 85 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 86 #ifdef INET 87 #ifdef INET6 88 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 89 #else 90 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 91 #endif 92 #else /* !INET */ 93 #ifdef INET6 94 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 95 #else 96 #define _PR_IP_SADDRSEL 0 97 #endif 98 #endif 99 100 /* prison0 describes what is "real" about the system. */ 101 struct prison prison0 = { 102 .pr_id = 0, 103 .pr_name = "0", 104 .pr_ref = 1, 105 .pr_uref = 1, 106 .pr_path = "/", 107 .pr_securelevel = -1, 108 .pr_devfs_rsnum = 0, 109 .pr_childmax = JAIL_MAX, 110 .pr_hostuuid = DEFAULT_HOSTUUID, 111 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 112 #ifdef VIMAGE 113 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 114 #else 115 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 116 #endif 117 .pr_allow = PR_ALLOW_ALL_STATIC, 118 }; 119 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 120 121 struct bool_flags { 122 const char *name; 123 const char *noname; 124 volatile u_int flag; 125 }; 126 struct jailsys_flags { 127 const char *name; 128 unsigned disable; 129 unsigned new; 130 }; 131 132 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 133 struct sx allprison_lock; 134 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 135 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 136 LIST_HEAD(, prison_racct) allprison_racct; 137 int lastprid = 0; 138 139 static int get_next_prid(struct prison **insprp); 140 static int do_jail_attach(struct thread *td, struct prison *pr); 141 static void prison_complete(void *context, int pending); 142 static void prison_deref(struct prison *pr, int flags); 143 static void prison_set_allow_locked(struct prison *pr, unsigned flag, 144 int enable); 145 static char *prison_path(struct prison *pr1, struct prison *pr2); 146 static void prison_remove_one(struct prison *pr); 147 #ifdef RACCT 148 static void prison_racct_attach(struct prison *pr); 149 static void prison_racct_modify(struct prison *pr); 150 static void prison_racct_detach(struct prison *pr); 151 #endif 152 153 /* Flags for prison_deref */ 154 #define PD_DEREF 0x01 /* Decrement pr_ref */ 155 #define PD_DEUREF 0x02 /* Decrement pr_uref */ 156 #define PD_LOCKED 0x04 /* pr_mtx is held */ 157 #define PD_LIST_SLOCKED 0x08 /* allprison_lock is held shared */ 158 #define PD_LIST_XLOCKED 0x10 /* allprison_lock is held exclusive */ 159 160 /* 161 * Parameter names corresponding to PR_* flag values. Size values are for kvm 162 * as we cannot figure out the size of a sparse array, or an array without a 163 * terminating entry. 164 */ 165 static struct bool_flags pr_flag_bool[] = { 166 {"persist", "nopersist", PR_PERSIST}, 167 #ifdef INET 168 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL}, 169 #endif 170 #ifdef INET6 171 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL}, 172 #endif 173 }; 174 const size_t pr_flag_bool_size = sizeof(pr_flag_bool); 175 176 static struct jailsys_flags pr_flag_jailsys[] = { 177 {"host", 0, PR_HOST}, 178 #ifdef VIMAGE 179 {"vnet", 0, PR_VNET}, 180 #endif 181 #ifdef INET 182 {"ip4", PR_IP4_USER, PR_IP4_USER}, 183 #endif 184 #ifdef INET6 185 {"ip6", PR_IP6_USER, PR_IP6_USER}, 186 #endif 187 }; 188 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 189 190 /* 191 * Make this array full-size so dynamic parameters can be added. 192 * It is protected by prison0.mtx, but lockless reading is allowed 193 * with an atomic check of the flag values. 194 */ 195 static struct bool_flags pr_flag_allow[NBBY * NBPW] = { 196 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME}, 197 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC}, 198 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS}, 199 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS}, 200 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT}, 201 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS}, 202 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF}, 203 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK}, 204 {"allow.reserved_ports", "allow.noreserved_ports", 205 PR_ALLOW_RESERVED_PORTS}, 206 {"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF}, 207 {"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug", 208 PR_ALLOW_UNPRIV_DEBUG}, 209 {"allow.suser", "allow.nosuser", PR_ALLOW_SUSER}, 210 }; 211 static unsigned pr_allow_all = PR_ALLOW_ALL_STATIC; 212 const size_t pr_flag_allow_size = sizeof(pr_flag_allow); 213 214 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \ 215 PR_ALLOW_RESERVED_PORTS | \ 216 PR_ALLOW_UNPRIV_DEBUG | \ 217 PR_ALLOW_SUSER) 218 #define JAIL_DEFAULT_ENFORCE_STATFS 2 219 #define JAIL_DEFAULT_DEVFS_RSNUM 0 220 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 221 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 222 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 223 #if defined(INET) || defined(INET6) 224 static unsigned jail_max_af_ips = 255; 225 #endif 226 227 /* 228 * Initialize the parts of prison0 that can't be static-initialized with 229 * constants. This is called from proc0_init() after creating thread0 cpuset. 230 */ 231 void 232 prison0_init(void) 233 { 234 uint8_t *file, *data; 235 size_t size; 236 237 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 238 prison0.pr_osreldate = osreldate; 239 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 240 241 /* If we have a preloaded hostuuid, use it. */ 242 file = preload_search_by_type(PRISON0_HOSTUUID_MODULE); 243 if (file != NULL) { 244 data = preload_fetch_addr(file); 245 size = preload_fetch_size(file); 246 if (data != NULL) { 247 /* 248 * The preloaded data may include trailing whitespace, almost 249 * certainly a newline; skip over any whitespace or 250 * non-printable characters to be safe. 251 */ 252 while (size > 0 && data[size - 1] <= 0x20) { 253 data[size--] = '\0'; 254 } 255 if (validate_uuid(data, size, NULL, 0) == 0) { 256 (void)strlcpy(prison0.pr_hostuuid, data, 257 size + 1); 258 } else if (bootverbose) { 259 printf("hostuuid: preload data malformed: '%s'", 260 data); 261 } 262 } 263 } 264 if (bootverbose) 265 printf("hostuuid: using %s\n", prison0.pr_hostuuid); 266 } 267 268 /* 269 * struct jail_args { 270 * struct jail *jail; 271 * }; 272 */ 273 int 274 sys_jail(struct thread *td, struct jail_args *uap) 275 { 276 uint32_t version; 277 int error; 278 struct jail j; 279 280 error = copyin(uap->jail, &version, sizeof(uint32_t)); 281 if (error) 282 return (error); 283 284 switch (version) { 285 case 0: 286 { 287 struct jail_v0 j0; 288 289 /* FreeBSD single IPv4 jails. */ 290 bzero(&j, sizeof(struct jail)); 291 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 292 if (error) 293 return (error); 294 j.version = j0.version; 295 j.path = j0.path; 296 j.hostname = j0.hostname; 297 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 298 break; 299 } 300 301 case 1: 302 /* 303 * Version 1 was used by multi-IPv4 jail implementations 304 * that never made it into the official kernel. 305 */ 306 return (EINVAL); 307 308 case 2: /* JAIL_API_VERSION */ 309 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 310 error = copyin(uap->jail, &j, sizeof(struct jail)); 311 if (error) 312 return (error); 313 break; 314 315 default: 316 /* Sci-Fi jails are not supported, sorry. */ 317 return (EINVAL); 318 } 319 return (kern_jail(td, &j)); 320 } 321 322 int 323 kern_jail(struct thread *td, struct jail *j) 324 { 325 struct iovec optiov[2 * (4 + nitems(pr_flag_allow) 326 #ifdef INET 327 + 1 328 #endif 329 #ifdef INET6 330 + 1 331 #endif 332 )]; 333 struct uio opt; 334 char *u_path, *u_hostname, *u_name; 335 struct bool_flags *bf; 336 #ifdef INET 337 uint32_t ip4s; 338 struct in_addr *u_ip4; 339 #endif 340 #ifdef INET6 341 struct in6_addr *u_ip6; 342 #endif 343 size_t tmplen; 344 int error, enforce_statfs; 345 346 bzero(&optiov, sizeof(optiov)); 347 opt.uio_iov = optiov; 348 opt.uio_iovcnt = 0; 349 opt.uio_offset = -1; 350 opt.uio_resid = -1; 351 opt.uio_segflg = UIO_SYSSPACE; 352 opt.uio_rw = UIO_READ; 353 opt.uio_td = td; 354 355 /* Set permissions for top-level jails from sysctls. */ 356 if (!jailed(td->td_ucred)) { 357 for (bf = pr_flag_allow; 358 bf < pr_flag_allow + nitems(pr_flag_allow) && 359 atomic_load_int(&bf->flag) != 0; 360 bf++) { 361 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *, 362 (jail_default_allow & bf->flag) 363 ? bf->name : bf->noname); 364 optiov[opt.uio_iovcnt].iov_len = 365 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 366 opt.uio_iovcnt += 2; 367 } 368 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 369 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 370 opt.uio_iovcnt++; 371 enforce_statfs = jail_default_enforce_statfs; 372 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 373 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 374 opt.uio_iovcnt++; 375 } 376 377 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 378 #ifdef INET 379 ip4s = (j->version == 0) ? 1 : j->ip4s; 380 if (ip4s > jail_max_af_ips) 381 return (EINVAL); 382 tmplen += ip4s * sizeof(struct in_addr); 383 #else 384 if (j->ip4s > 0) 385 return (EINVAL); 386 #endif 387 #ifdef INET6 388 if (j->ip6s > jail_max_af_ips) 389 return (EINVAL); 390 tmplen += j->ip6s * sizeof(struct in6_addr); 391 #else 392 if (j->ip6s > 0) 393 return (EINVAL); 394 #endif 395 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 396 u_hostname = u_path + MAXPATHLEN; 397 u_name = u_hostname + MAXHOSTNAMELEN; 398 #ifdef INET 399 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 400 #endif 401 #ifdef INET6 402 #ifdef INET 403 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 404 #else 405 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 406 #endif 407 #endif 408 optiov[opt.uio_iovcnt].iov_base = "path"; 409 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 410 opt.uio_iovcnt++; 411 optiov[opt.uio_iovcnt].iov_base = u_path; 412 error = copyinstr(j->path, u_path, MAXPATHLEN, 413 &optiov[opt.uio_iovcnt].iov_len); 414 if (error) { 415 free(u_path, M_TEMP); 416 return (error); 417 } 418 opt.uio_iovcnt++; 419 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 420 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 421 opt.uio_iovcnt++; 422 optiov[opt.uio_iovcnt].iov_base = u_hostname; 423 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 424 &optiov[opt.uio_iovcnt].iov_len); 425 if (error) { 426 free(u_path, M_TEMP); 427 return (error); 428 } 429 opt.uio_iovcnt++; 430 if (j->jailname != NULL) { 431 optiov[opt.uio_iovcnt].iov_base = "name"; 432 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 433 opt.uio_iovcnt++; 434 optiov[opt.uio_iovcnt].iov_base = u_name; 435 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 436 &optiov[opt.uio_iovcnt].iov_len); 437 if (error) { 438 free(u_path, M_TEMP); 439 return (error); 440 } 441 opt.uio_iovcnt++; 442 } 443 #ifdef INET 444 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 445 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 446 opt.uio_iovcnt++; 447 optiov[opt.uio_iovcnt].iov_base = u_ip4; 448 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 449 if (j->version == 0) 450 u_ip4->s_addr = j->ip4s; 451 else { 452 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 453 if (error) { 454 free(u_path, M_TEMP); 455 return (error); 456 } 457 } 458 opt.uio_iovcnt++; 459 #endif 460 #ifdef INET6 461 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 462 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 463 opt.uio_iovcnt++; 464 optiov[opt.uio_iovcnt].iov_base = u_ip6; 465 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 466 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 467 if (error) { 468 free(u_path, M_TEMP); 469 return (error); 470 } 471 opt.uio_iovcnt++; 472 #endif 473 KASSERT(opt.uio_iovcnt <= nitems(optiov), 474 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 475 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 476 free(u_path, M_TEMP); 477 return (error); 478 } 479 480 /* 481 * struct jail_set_args { 482 * struct iovec *iovp; 483 * unsigned int iovcnt; 484 * int flags; 485 * }; 486 */ 487 int 488 sys_jail_set(struct thread *td, struct jail_set_args *uap) 489 { 490 struct uio *auio; 491 int error; 492 493 /* Check that we have an even number of iovecs. */ 494 if (uap->iovcnt & 1) 495 return (EINVAL); 496 497 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 498 if (error) 499 return (error); 500 error = kern_jail_set(td, auio, uap->flags); 501 free(auio, M_IOV); 502 return (error); 503 } 504 505 int 506 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 507 { 508 struct nameidata nd; 509 #ifdef INET 510 struct in_addr *ip4; 511 #endif 512 #ifdef INET6 513 struct in6_addr *ip6; 514 #endif 515 struct vfsopt *opt; 516 struct vfsoptlist *opts; 517 struct prison *pr, *deadpr, *inspr, *mypr, *ppr, *tpr; 518 struct vnode *root; 519 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 520 char *g_path, *osrelstr; 521 struct bool_flags *bf; 522 struct jailsys_flags *jsf; 523 #if defined(INET) || defined(INET6) 524 struct prison *tppr; 525 void *op; 526 #endif 527 unsigned long hid; 528 size_t namelen, onamelen, pnamelen; 529 int born, created, cuflags, descend, drflags, enforce; 530 int error, errmsg_len, errmsg_pos; 531 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 532 int jid, jsys, len, level; 533 int childmax, osreldt, rsnum, slevel; 534 #if defined(INET) || defined(INET6) 535 int ii, ij; 536 #endif 537 #ifdef INET 538 int ip4s, redo_ip4; 539 #endif 540 #ifdef INET6 541 int ip6s, redo_ip6; 542 #endif 543 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 544 uint64_t pr_allow_diff; 545 unsigned tallow; 546 char numbuf[12]; 547 548 error = priv_check(td, PRIV_JAIL_SET); 549 if (!error && (flags & JAIL_ATTACH)) 550 error = priv_check(td, PRIV_JAIL_ATTACH); 551 if (error) 552 return (error); 553 mypr = td->td_ucred->cr_prison; 554 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 555 return (EPERM); 556 if (flags & ~JAIL_SET_MASK) 557 return (EINVAL); 558 559 /* 560 * Check all the parameters before committing to anything. Not all 561 * errors can be caught early, but we may as well try. Also, this 562 * takes care of some expensive stuff (path lookup) before getting 563 * the allprison lock. 564 * 565 * XXX Jails are not filesystems, and jail parameters are not mount 566 * options. But it makes more sense to re-use the vfsopt code 567 * than duplicate it under a different name. 568 */ 569 error = vfs_buildopts(optuio, &opts); 570 if (error) 571 return (error); 572 #ifdef INET 573 ip4 = NULL; 574 #endif 575 #ifdef INET6 576 ip6 = NULL; 577 #endif 578 g_path = NULL; 579 580 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 581 if (!cuflags) { 582 error = EINVAL; 583 vfs_opterror(opts, "no valid operation (create or update)"); 584 goto done_errmsg; 585 } 586 587 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 588 if (error == ENOENT) 589 jid = 0; 590 else if (error != 0) 591 goto done_free; 592 593 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 594 if (error == ENOENT) 595 gotslevel = 0; 596 else if (error != 0) 597 goto done_free; 598 else 599 gotslevel = 1; 600 601 error = 602 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 603 if (error == ENOENT) 604 gotchildmax = 0; 605 else if (error != 0) 606 goto done_free; 607 else 608 gotchildmax = 1; 609 610 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 611 if (error == ENOENT) 612 gotenforce = 0; 613 else if (error != 0) 614 goto done_free; 615 else if (enforce < 0 || enforce > 2) { 616 error = EINVAL; 617 goto done_free; 618 } else 619 gotenforce = 1; 620 621 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 622 if (error == ENOENT) 623 gotrsnum = 0; 624 else if (error != 0) 625 goto done_free; 626 else 627 gotrsnum = 1; 628 629 pr_flags = ch_flags = 0; 630 for (bf = pr_flag_bool; 631 bf < pr_flag_bool + nitems(pr_flag_bool); 632 bf++) { 633 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag); 634 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag); 635 } 636 ch_flags |= pr_flags; 637 for (jsf = pr_flag_jailsys; 638 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 639 jsf++) { 640 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys)); 641 if (error == ENOENT) 642 continue; 643 if (error != 0) 644 goto done_free; 645 switch (jsys) { 646 case JAIL_SYS_DISABLE: 647 if (!jsf->disable) { 648 error = EINVAL; 649 goto done_free; 650 } 651 pr_flags |= jsf->disable; 652 break; 653 case JAIL_SYS_NEW: 654 pr_flags |= jsf->new; 655 break; 656 case JAIL_SYS_INHERIT: 657 break; 658 default: 659 error = EINVAL; 660 goto done_free; 661 } 662 ch_flags |= jsf->new | jsf->disable; 663 } 664 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 665 && !(pr_flags & PR_PERSIST)) { 666 error = EINVAL; 667 vfs_opterror(opts, "new jail must persist or attach"); 668 goto done_errmsg; 669 } 670 #ifdef VIMAGE 671 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 672 error = EINVAL; 673 vfs_opterror(opts, "vnet cannot be changed after creation"); 674 goto done_errmsg; 675 } 676 #endif 677 #ifdef INET 678 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 679 error = EINVAL; 680 vfs_opterror(opts, "ip4 cannot be changed after creation"); 681 goto done_errmsg; 682 } 683 #endif 684 #ifdef INET6 685 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 686 error = EINVAL; 687 vfs_opterror(opts, "ip6 cannot be changed after creation"); 688 goto done_errmsg; 689 } 690 #endif 691 692 pr_allow = ch_allow = 0; 693 for (bf = pr_flag_allow; 694 bf < pr_flag_allow + nitems(pr_flag_allow) && 695 atomic_load_int(&bf->flag) != 0; 696 bf++) { 697 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag); 698 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag); 699 } 700 ch_allow |= pr_allow; 701 702 error = vfs_getopt(opts, "name", (void **)&name, &len); 703 if (error == ENOENT) 704 name = NULL; 705 else if (error != 0) 706 goto done_free; 707 else { 708 if (len == 0 || name[len - 1] != '\0') { 709 error = EINVAL; 710 goto done_free; 711 } 712 if (len > MAXHOSTNAMELEN) { 713 error = ENAMETOOLONG; 714 goto done_free; 715 } 716 } 717 718 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 719 if (error == ENOENT) 720 host = NULL; 721 else if (error != 0) 722 goto done_free; 723 else { 724 ch_flags |= PR_HOST; 725 pr_flags |= PR_HOST; 726 if (len == 0 || host[len - 1] != '\0') { 727 error = EINVAL; 728 goto done_free; 729 } 730 if (len > MAXHOSTNAMELEN) { 731 error = ENAMETOOLONG; 732 goto done_free; 733 } 734 } 735 736 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 737 if (error == ENOENT) 738 domain = NULL; 739 else if (error != 0) 740 goto done_free; 741 else { 742 ch_flags |= PR_HOST; 743 pr_flags |= PR_HOST; 744 if (len == 0 || domain[len - 1] != '\0') { 745 error = EINVAL; 746 goto done_free; 747 } 748 if (len > MAXHOSTNAMELEN) { 749 error = ENAMETOOLONG; 750 goto done_free; 751 } 752 } 753 754 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 755 if (error == ENOENT) 756 uuid = NULL; 757 else if (error != 0) 758 goto done_free; 759 else { 760 ch_flags |= PR_HOST; 761 pr_flags |= PR_HOST; 762 if (len == 0 || uuid[len - 1] != '\0') { 763 error = EINVAL; 764 goto done_free; 765 } 766 if (len > HOSTUUIDLEN) { 767 error = ENAMETOOLONG; 768 goto done_free; 769 } 770 } 771 772 #ifdef COMPAT_FREEBSD32 773 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 774 uint32_t hid32; 775 776 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 777 hid = hid32; 778 } else 779 #endif 780 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 781 if (error == ENOENT) 782 gothid = 0; 783 else if (error != 0) 784 goto done_free; 785 else { 786 gothid = 1; 787 ch_flags |= PR_HOST; 788 pr_flags |= PR_HOST; 789 } 790 791 #ifdef INET 792 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 793 if (error == ENOENT) 794 ip4s = 0; 795 else if (error != 0) 796 goto done_free; 797 else if (ip4s & (sizeof(*ip4) - 1)) { 798 error = EINVAL; 799 goto done_free; 800 } else { 801 ch_flags |= PR_IP4_USER; 802 pr_flags |= PR_IP4_USER; 803 if (ip4s > 0) { 804 ip4s /= sizeof(*ip4); 805 if (ip4s > jail_max_af_ips) { 806 error = EINVAL; 807 vfs_opterror(opts, "too many IPv4 addresses"); 808 goto done_errmsg; 809 } 810 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 811 bcopy(op, ip4, ip4s * sizeof(*ip4)); 812 /* 813 * IP addresses are all sorted but ip[0] to preserve 814 * the primary IP address as given from userland. 815 * This special IP is used for unbound outgoing 816 * connections as well for "loopback" traffic in case 817 * source address selection cannot find any more fitting 818 * address to connect from. 819 */ 820 if (ip4s > 1) 821 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), 822 prison_qcmp_v4); 823 /* 824 * Check for duplicate addresses and do some simple 825 * zero and broadcast checks. If users give other bogus 826 * addresses it is their problem. 827 * 828 * We do not have to care about byte order for these 829 * checks so we will do them in NBO. 830 */ 831 for (ii = 0; ii < ip4s; ii++) { 832 if (ip4[ii].s_addr == INADDR_ANY || 833 ip4[ii].s_addr == INADDR_BROADCAST) { 834 error = EINVAL; 835 goto done_free; 836 } 837 if ((ii+1) < ip4s && 838 (ip4[0].s_addr == ip4[ii+1].s_addr || 839 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 840 error = EINVAL; 841 goto done_free; 842 } 843 } 844 } 845 } 846 #endif 847 848 #ifdef INET6 849 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 850 if (error == ENOENT) 851 ip6s = 0; 852 else if (error != 0) 853 goto done_free; 854 else if (ip6s & (sizeof(*ip6) - 1)) { 855 error = EINVAL; 856 goto done_free; 857 } else { 858 ch_flags |= PR_IP6_USER; 859 pr_flags |= PR_IP6_USER; 860 if (ip6s > 0) { 861 ip6s /= sizeof(*ip6); 862 if (ip6s > jail_max_af_ips) { 863 error = EINVAL; 864 vfs_opterror(opts, "too many IPv6 addresses"); 865 goto done_errmsg; 866 } 867 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 868 bcopy(op, ip6, ip6s * sizeof(*ip6)); 869 if (ip6s > 1) 870 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), 871 prison_qcmp_v6); 872 for (ii = 0; ii < ip6s; ii++) { 873 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 874 error = EINVAL; 875 goto done_free; 876 } 877 if ((ii+1) < ip6s && 878 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 879 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 880 { 881 error = EINVAL; 882 goto done_free; 883 } 884 } 885 } 886 } 887 #endif 888 889 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 890 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 891 error = EINVAL; 892 vfs_opterror(opts, 893 "vnet jails cannot have IP address restrictions"); 894 goto done_errmsg; 895 } 896 #endif 897 898 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 899 if (error == ENOENT) 900 osrelstr = NULL; 901 else if (error != 0) 902 goto done_free; 903 else { 904 if (flags & JAIL_UPDATE) { 905 error = EINVAL; 906 vfs_opterror(opts, 907 "osrelease cannot be changed after creation"); 908 goto done_errmsg; 909 } 910 if (len == 0 || osrelstr[len - 1] != '\0') { 911 error = EINVAL; 912 goto done_free; 913 } 914 if (len >= OSRELEASELEN) { 915 error = ENAMETOOLONG; 916 vfs_opterror(opts, 917 "osrelease string must be 1-%d bytes long", 918 OSRELEASELEN - 1); 919 goto done_errmsg; 920 } 921 } 922 923 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 924 if (error == ENOENT) 925 osreldt = 0; 926 else if (error != 0) 927 goto done_free; 928 else { 929 if (flags & JAIL_UPDATE) { 930 error = EINVAL; 931 vfs_opterror(opts, 932 "osreldate cannot be changed after creation"); 933 goto done_errmsg; 934 } 935 if (osreldt == 0) { 936 error = EINVAL; 937 vfs_opterror(opts, "osreldate cannot be 0"); 938 goto done_errmsg; 939 } 940 } 941 942 root = NULL; 943 error = vfs_getopt(opts, "path", (void **)&path, &len); 944 if (error == ENOENT) 945 path = NULL; 946 else if (error != 0) 947 goto done_free; 948 else { 949 if (flags & JAIL_UPDATE) { 950 error = EINVAL; 951 vfs_opterror(opts, 952 "path cannot be changed after creation"); 953 goto done_errmsg; 954 } 955 if (len == 0 || path[len - 1] != '\0') { 956 error = EINVAL; 957 goto done_free; 958 } 959 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 960 path, td); 961 error = namei(&nd); 962 if (error) 963 goto done_free; 964 root = nd.ni_vp; 965 NDFREE(&nd, NDF_ONLY_PNBUF); 966 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 967 strlcpy(g_path, path, MAXPATHLEN); 968 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 969 if (error == 0) { 970 path = g_path; 971 } else { 972 /* exit on other errors */ 973 goto done_free; 974 } 975 if (root->v_type != VDIR) { 976 error = ENOTDIR; 977 vput(root); 978 goto done_free; 979 } 980 VOP_UNLOCK(root); 981 } 982 983 /* 984 * Find the specified jail, or at least its parent. 985 * This abuses the file error codes ENOENT and EEXIST. 986 */ 987 pr = NULL; 988 ppr = mypr; 989 inspr = NULL; 990 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 991 namelc = strrchr(name, '.'); 992 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 993 if (*p != '\0') 994 jid = 0; 995 } 996 sx_xlock(&allprison_lock); 997 drflags = PD_LIST_XLOCKED; 998 if (jid != 0) { 999 if (jid < 0) { 1000 error = EINVAL; 1001 vfs_opterror(opts, "negative jid"); 1002 goto done_deref; 1003 } 1004 /* 1005 * See if a requested jid already exists. Keep track of 1006 * where it can be inserted later. 1007 */ 1008 TAILQ_FOREACH(inspr, &allprison, pr_list) { 1009 if (inspr->pr_id == jid) { 1010 mtx_lock(&inspr->pr_mtx); 1011 if (prison_isvalid(inspr)) { 1012 pr = inspr; 1013 drflags |= PD_LOCKED; 1014 inspr = NULL; 1015 } else 1016 mtx_unlock(&inspr->pr_mtx); 1017 break; 1018 } 1019 if (inspr->pr_id > jid) 1020 break; 1021 } 1022 if (pr != NULL) { 1023 ppr = pr->pr_parent; 1024 /* Create: jid must not exist. */ 1025 if (cuflags == JAIL_CREATE) { 1026 /* 1027 * Even creators that cannot see the jail will 1028 * get EEXIST. 1029 */ 1030 error = EEXIST; 1031 vfs_opterror(opts, "jail %d already exists", 1032 jid); 1033 goto done_deref; 1034 } 1035 if (!prison_ischild(mypr, pr)) { 1036 /* 1037 * Updaters get ENOENT if they cannot see the 1038 * jail. This is true even for CREATE | UPDATE, 1039 * which normally cannot give this error. 1040 */ 1041 error = ENOENT; 1042 vfs_opterror(opts, "jail %d not found", jid); 1043 goto done_deref; 1044 } else if (!prison_isalive(pr)) { 1045 if (!(flags & JAIL_DYING)) { 1046 error = ENOENT; 1047 vfs_opterror(opts, "jail %d is dying", 1048 jid); 1049 goto done_deref; 1050 } else if ((flags & JAIL_ATTACH) || 1051 (pr_flags & PR_PERSIST)) { 1052 /* 1053 * A dying jail might be resurrected 1054 * (via attach or persist), but first 1055 * it must determine if another jail 1056 * has claimed its name. Accomplish 1057 * this by implicitly re-setting the 1058 * name. 1059 */ 1060 if (name == NULL) 1061 name = prison_name(mypr, pr); 1062 } 1063 } 1064 } else { 1065 /* Update: jid must exist. */ 1066 if (cuflags == JAIL_UPDATE) { 1067 error = ENOENT; 1068 vfs_opterror(opts, "jail %d not found", jid); 1069 goto done_deref; 1070 } 1071 } 1072 } 1073 /* 1074 * If the caller provided a name, look for a jail by that name. 1075 * This has different semantics for creates and updates keyed by jid 1076 * (where the name must not already exist in a different jail), 1077 * and updates keyed by the name itself (where the name must exist 1078 * because that is the jail being updated). 1079 */ 1080 namelc = NULL; 1081 if (name != NULL) { 1082 namelc = strrchr(name, '.'); 1083 if (namelc == NULL) 1084 namelc = name; 1085 else { 1086 /* 1087 * This is a hierarchical name. Split it into the 1088 * parent and child names, and make sure the parent 1089 * exists or matches an already found jail. 1090 */ 1091 if (pr != NULL) { 1092 if (strncmp(name, ppr->pr_name, namelc - name) 1093 || ppr->pr_name[namelc - name] != '\0') { 1094 error = EINVAL; 1095 vfs_opterror(opts, 1096 "cannot change jail's parent"); 1097 goto done_deref; 1098 } 1099 } else { 1100 *namelc = '\0'; 1101 ppr = prison_find_name(mypr, name); 1102 if (ppr == NULL) { 1103 error = ENOENT; 1104 vfs_opterror(opts, 1105 "jail \"%s\" not found", name); 1106 goto done_deref; 1107 } 1108 mtx_unlock(&ppr->pr_mtx); 1109 *namelc = '.'; 1110 } 1111 namelc++; 1112 } 1113 if (namelc[0] != '\0') { 1114 pnamelen = 1115 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1116 name_again: 1117 deadpr = NULL; 1118 FOREACH_PRISON_CHILD(ppr, tpr) { 1119 if (tpr != pr && 1120 !strcmp(tpr->pr_name + pnamelen, namelc)) { 1121 mtx_lock(&tpr->pr_mtx); 1122 if (prison_isalive(tpr)) { 1123 if (pr == NULL && 1124 cuflags != JAIL_CREATE) { 1125 /* 1126 * Use this jail 1127 * for updates. 1128 */ 1129 pr = tpr; 1130 drflags |= PD_LOCKED; 1131 break; 1132 } 1133 /* 1134 * Create, or update(jid): 1135 * name must not exist in an 1136 * active sibling jail. 1137 */ 1138 error = EEXIST; 1139 mtx_unlock(&tpr->pr_mtx); 1140 vfs_opterror(opts, 1141 "jail \"%s\" already exists", 1142 name); 1143 goto done_deref; 1144 } 1145 if (pr == NULL && 1146 cuflags != JAIL_CREATE && 1147 prison_isvalid(tpr)) 1148 deadpr = tpr; 1149 mtx_unlock(&tpr->pr_mtx); 1150 } 1151 } 1152 /* If no active jail is found, use a dying one. */ 1153 if (deadpr != NULL && pr == NULL) { 1154 if (flags & JAIL_DYING) { 1155 mtx_lock(&deadpr->pr_mtx); 1156 if (!prison_isvalid(deadpr)) { 1157 mtx_unlock(&deadpr->pr_mtx); 1158 goto name_again; 1159 } 1160 pr = deadpr; 1161 drflags |= PD_LOCKED; 1162 } else if (cuflags == JAIL_UPDATE) { 1163 error = ENOENT; 1164 vfs_opterror(opts, 1165 "jail \"%s\" is dying", name); 1166 goto done_deref; 1167 } 1168 } 1169 /* Update: name must exist if no jid. */ 1170 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1171 error = ENOENT; 1172 vfs_opterror(opts, "jail \"%s\" not found", 1173 name); 1174 goto done_deref; 1175 } 1176 } 1177 } 1178 /* Update: must provide a jid or name. */ 1179 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1180 error = ENOENT; 1181 vfs_opterror(opts, "update specified no jail"); 1182 goto done_deref; 1183 } 1184 1185 /* If there's no prison to update, create a new one and link it in. */ 1186 created = pr == NULL; 1187 if (created) { 1188 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1189 if (tpr->pr_childcount >= tpr->pr_childmax) { 1190 error = EPERM; 1191 vfs_opterror(opts, "prison limit exceeded"); 1192 goto done_deref; 1193 } 1194 mtx_lock(&ppr->pr_mtx); 1195 if (!prison_isvalid(ppr)) { 1196 mtx_unlock(&ppr->pr_mtx); 1197 error = ENOENT; 1198 vfs_opterror(opts, "jail \"%s\" not found", 1199 prison_name(mypr, ppr)); 1200 goto done_deref; 1201 } 1202 prison_hold(ppr); 1203 refcount_acquire(&ppr->pr_uref); 1204 mtx_unlock(&ppr->pr_mtx); 1205 1206 if (jid == 0 && (jid = get_next_prid(&inspr)) == 0) { 1207 error = EAGAIN; 1208 vfs_opterror(opts, "no available jail IDs"); 1209 pr = ppr; 1210 drflags |= PD_DEREF | PD_DEUREF; 1211 goto done_deref; 1212 } 1213 1214 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1215 LIST_INIT(&pr->pr_children); 1216 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1217 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1218 1219 pr->pr_id = jid; 1220 if (inspr != NULL) 1221 TAILQ_INSERT_BEFORE(inspr, pr, pr_list); 1222 else 1223 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1224 1225 pr->pr_parent = ppr; 1226 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1227 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1228 tpr->pr_childcount++; 1229 1230 /* Set some default values, and inherit some from the parent. */ 1231 if (namelc == NULL) 1232 namelc = ""; 1233 if (path == NULL) { 1234 path = "/"; 1235 root = mypr->pr_root; 1236 vref(root); 1237 } 1238 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1239 pr->pr_flags |= PR_HOST; 1240 #if defined(INET) || defined(INET6) 1241 #ifdef VIMAGE 1242 if (!(pr_flags & PR_VNET)) 1243 #endif 1244 { 1245 #ifdef INET 1246 if (!(ch_flags & PR_IP4_USER)) 1247 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1248 else if (!(pr_flags & PR_IP4_USER)) { 1249 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1250 if (ppr->pr_ip4 != NULL) { 1251 pr->pr_ip4s = ppr->pr_ip4s; 1252 pr->pr_ip4 = malloc(pr->pr_ip4s * 1253 sizeof(struct in_addr), M_PRISON, 1254 M_WAITOK); 1255 bcopy(ppr->pr_ip4, pr->pr_ip4, 1256 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1257 } 1258 } 1259 #endif 1260 #ifdef INET6 1261 if (!(ch_flags & PR_IP6_USER)) 1262 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1263 else if (!(pr_flags & PR_IP6_USER)) { 1264 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1265 if (ppr->pr_ip6 != NULL) { 1266 pr->pr_ip6s = ppr->pr_ip6s; 1267 pr->pr_ip6 = malloc(pr->pr_ip6s * 1268 sizeof(struct in6_addr), M_PRISON, 1269 M_WAITOK); 1270 bcopy(ppr->pr_ip6, pr->pr_ip6, 1271 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1272 } 1273 } 1274 #endif 1275 } 1276 #endif 1277 /* Source address selection is always on by default. */ 1278 pr->pr_flags |= _PR_IP_SADDRSEL; 1279 1280 pr->pr_securelevel = ppr->pr_securelevel; 1281 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1282 pr->pr_enforce_statfs = jail_default_enforce_statfs; 1283 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1284 1285 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1286 if (osrelstr == NULL) 1287 strlcpy(pr->pr_osrelease, ppr->pr_osrelease, 1288 sizeof(pr->pr_osrelease)); 1289 else 1290 strlcpy(pr->pr_osrelease, osrelstr, 1291 sizeof(pr->pr_osrelease)); 1292 1293 #ifdef VIMAGE 1294 /* Allocate a new vnet if specified. */ 1295 pr->pr_vnet = (pr_flags & PR_VNET) 1296 ? vnet_alloc() : ppr->pr_vnet; 1297 #endif 1298 /* 1299 * Allocate a dedicated cpuset for each jail. 1300 * Unlike other initial settings, this may return an erorr. 1301 */ 1302 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1303 if (error) 1304 goto done_deref; 1305 1306 mtx_lock(&pr->pr_mtx); 1307 drflags |= PD_LOCKED; 1308 /* 1309 * New prisons do not yet have a reference, because we do not 1310 * want others to see the incomplete prison once the 1311 * allprison_lock is downgraded. 1312 */ 1313 } else { 1314 /* 1315 * Grab a reference for existing prisons, to ensure they 1316 * continue to exist for the duration of the call. 1317 */ 1318 prison_hold(pr); 1319 drflags |= PD_DEREF; 1320 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1321 if ((pr->pr_flags & PR_VNET) && 1322 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1323 error = EINVAL; 1324 vfs_opterror(opts, 1325 "vnet jails cannot have IP address restrictions"); 1326 goto done_deref; 1327 } 1328 #endif 1329 #ifdef INET 1330 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1331 error = EINVAL; 1332 vfs_opterror(opts, 1333 "ip4 cannot be changed after creation"); 1334 goto done_deref; 1335 } 1336 #endif 1337 #ifdef INET6 1338 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1339 error = EINVAL; 1340 vfs_opterror(opts, 1341 "ip6 cannot be changed after creation"); 1342 goto done_deref; 1343 } 1344 #endif 1345 } 1346 1347 /* Do final error checking before setting anything. */ 1348 if (gotslevel) { 1349 if (slevel < ppr->pr_securelevel) { 1350 error = EPERM; 1351 goto done_deref; 1352 } 1353 } 1354 if (gotchildmax) { 1355 if (childmax >= ppr->pr_childmax) { 1356 error = EPERM; 1357 goto done_deref; 1358 } 1359 } 1360 if (gotenforce) { 1361 if (enforce < ppr->pr_enforce_statfs) { 1362 error = EPERM; 1363 goto done_deref; 1364 } 1365 } 1366 if (gotrsnum) { 1367 /* 1368 * devfs_rsnum is a uint16_t 1369 */ 1370 if (rsnum < 0 || rsnum > 65535) { 1371 error = EINVAL; 1372 goto done_deref; 1373 } 1374 /* 1375 * Nested jails always inherit parent's devfs ruleset 1376 */ 1377 if (jailed(td->td_ucred)) { 1378 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1379 error = EPERM; 1380 goto done_deref; 1381 } else 1382 rsnum = ppr->pr_devfs_rsnum; 1383 } 1384 } 1385 #ifdef INET 1386 if (ip4s > 0) { 1387 if (ppr->pr_flags & PR_IP4) { 1388 /* 1389 * Make sure the new set of IP addresses is a 1390 * subset of the parent's list. Don't worry 1391 * about the parent being unlocked, as any 1392 * setting is done with allprison_lock held. 1393 */ 1394 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1395 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1396 break; 1397 if (ij == ppr->pr_ip4s) { 1398 error = EPERM; 1399 goto done_deref; 1400 } 1401 if (ip4s > 1) { 1402 for (ii = ij = 1; ii < ip4s; ii++) { 1403 if (ip4[ii].s_addr == 1404 ppr->pr_ip4[0].s_addr) 1405 continue; 1406 for (; ij < ppr->pr_ip4s; ij++) 1407 if (ip4[ii].s_addr == 1408 ppr->pr_ip4[ij].s_addr) 1409 break; 1410 if (ij == ppr->pr_ip4s) 1411 break; 1412 } 1413 if (ij == ppr->pr_ip4s) { 1414 error = EPERM; 1415 goto done_deref; 1416 } 1417 } 1418 } 1419 /* 1420 * Check for conflicting IP addresses. We permit them 1421 * if there is no more than one IP on each jail. If 1422 * there is a duplicate on a jail with more than one 1423 * IP stop checking and return error. 1424 */ 1425 #ifdef VIMAGE 1426 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1427 if (tppr->pr_flags & PR_VNET) 1428 break; 1429 #else 1430 tppr = &prison0; 1431 #endif 1432 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1433 if (tpr == pr || 1434 #ifdef VIMAGE 1435 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1436 #endif 1437 refcount_load(&tpr->pr_uref) == 0) { 1438 descend = 0; 1439 continue; 1440 } 1441 if (!(tpr->pr_flags & PR_IP4_USER)) 1442 continue; 1443 descend = 0; 1444 if (tpr->pr_ip4 == NULL || 1445 (ip4s == 1 && tpr->pr_ip4s == 1)) 1446 continue; 1447 for (ii = 0; ii < ip4s; ii++) { 1448 if (prison_check_ip4_locked(tpr, &ip4[ii]) == 1449 0) { 1450 error = EADDRINUSE; 1451 vfs_opterror(opts, 1452 "IPv4 addresses clash"); 1453 goto done_deref; 1454 } 1455 } 1456 } 1457 } 1458 #endif 1459 #ifdef INET6 1460 if (ip6s > 0) { 1461 if (ppr->pr_flags & PR_IP6) { 1462 /* 1463 * Make sure the new set of IP addresses is a 1464 * subset of the parent's list. 1465 */ 1466 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1467 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1468 &ppr->pr_ip6[ij])) 1469 break; 1470 if (ij == ppr->pr_ip6s) { 1471 error = EPERM; 1472 goto done_deref; 1473 } 1474 if (ip6s > 1) { 1475 for (ii = ij = 1; ii < ip6s; ii++) { 1476 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1477 &ppr->pr_ip6[0])) 1478 continue; 1479 for (; ij < ppr->pr_ip6s; ij++) 1480 if (IN6_ARE_ADDR_EQUAL( 1481 &ip6[ii], &ppr->pr_ip6[ij])) 1482 break; 1483 if (ij == ppr->pr_ip6s) 1484 break; 1485 } 1486 if (ij == ppr->pr_ip6s) { 1487 error = EPERM; 1488 goto done_deref; 1489 } 1490 } 1491 } 1492 /* Check for conflicting IP addresses. */ 1493 #ifdef VIMAGE 1494 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1495 if (tppr->pr_flags & PR_VNET) 1496 break; 1497 #else 1498 tppr = &prison0; 1499 #endif 1500 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1501 if (tpr == pr || 1502 #ifdef VIMAGE 1503 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1504 #endif 1505 refcount_load(&tpr->pr_uref) == 0) { 1506 descend = 0; 1507 continue; 1508 } 1509 if (!(tpr->pr_flags & PR_IP6_USER)) 1510 continue; 1511 descend = 0; 1512 if (tpr->pr_ip6 == NULL || 1513 (ip6s == 1 && tpr->pr_ip6s == 1)) 1514 continue; 1515 for (ii = 0; ii < ip6s; ii++) { 1516 if (prison_check_ip6_locked(tpr, &ip6[ii]) == 1517 0) { 1518 error = EADDRINUSE; 1519 vfs_opterror(opts, 1520 "IPv6 addresses clash"); 1521 goto done_deref; 1522 } 1523 } 1524 } 1525 } 1526 #endif 1527 onamelen = namelen = 0; 1528 if (namelc != 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 (namelc[0] == '\0') 1534 snprintf(namelc = 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; 1541 } 1542 /* 1543 * Make sure the name isn't too long for the prison or its 1544 * children. 1545 */ 1546 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1547 onamelen = strlen(pr->pr_name + pnamelen); 1548 namelen = strlen(namelc); 1549 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1550 error = ENAMETOOLONG; 1551 goto done_deref; 1552 } 1553 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1554 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1555 sizeof(pr->pr_name)) { 1556 error = ENAMETOOLONG; 1557 goto done_deref; 1558 } 1559 } 1560 } 1561 pr_allow_diff = pr_allow & ~ppr->pr_allow; 1562 if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) { 1563 error = EPERM; 1564 goto done_deref; 1565 } 1566 1567 /* 1568 * Let modules check their parameters. This requires unlocking and 1569 * then re-locking the prison, but this is still a valid state as long 1570 * as allprison_lock remains xlocked. 1571 */ 1572 mtx_unlock(&pr->pr_mtx); 1573 drflags &= ~PD_LOCKED; 1574 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1575 if (error != 0) 1576 goto done_deref; 1577 mtx_lock(&pr->pr_mtx); 1578 drflags |= PD_LOCKED; 1579 1580 /* At this point, all valid parameters should have been noted. */ 1581 TAILQ_FOREACH(opt, opts, link) { 1582 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1583 error = EINVAL; 1584 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1585 goto done_deref; 1586 } 1587 } 1588 1589 /* Set the parameters of the prison. */ 1590 #ifdef INET 1591 redo_ip4 = 0; 1592 if (pr_flags & PR_IP4_USER) { 1593 pr->pr_flags |= PR_IP4; 1594 free(pr->pr_ip4, M_PRISON); 1595 pr->pr_ip4s = ip4s; 1596 pr->pr_ip4 = ip4; 1597 ip4 = NULL; 1598 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1599 #ifdef VIMAGE 1600 if (tpr->pr_flags & PR_VNET) { 1601 descend = 0; 1602 continue; 1603 } 1604 #endif 1605 if (prison_restrict_ip4(tpr, NULL)) { 1606 redo_ip4 = 1; 1607 descend = 0; 1608 } 1609 } 1610 } 1611 #endif 1612 #ifdef INET6 1613 redo_ip6 = 0; 1614 if (pr_flags & PR_IP6_USER) { 1615 pr->pr_flags |= PR_IP6; 1616 free(pr->pr_ip6, M_PRISON); 1617 pr->pr_ip6s = ip6s; 1618 pr->pr_ip6 = ip6; 1619 ip6 = NULL; 1620 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1621 #ifdef VIMAGE 1622 if (tpr->pr_flags & PR_VNET) { 1623 descend = 0; 1624 continue; 1625 } 1626 #endif 1627 if (prison_restrict_ip6(tpr, NULL)) { 1628 redo_ip6 = 1; 1629 descend = 0; 1630 } 1631 } 1632 } 1633 #endif 1634 if (gotslevel) { 1635 pr->pr_securelevel = slevel; 1636 /* Set all child jails to be at least this level. */ 1637 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1638 if (tpr->pr_securelevel < slevel) 1639 tpr->pr_securelevel = slevel; 1640 } 1641 if (gotchildmax) { 1642 pr->pr_childmax = childmax; 1643 /* Set all child jails to under this limit. */ 1644 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1645 if (tpr->pr_childmax > childmax - level) 1646 tpr->pr_childmax = childmax > level 1647 ? childmax - level : 0; 1648 } 1649 if (gotenforce) { 1650 pr->pr_enforce_statfs = enforce; 1651 /* Pass this restriction on to the children. */ 1652 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1653 if (tpr->pr_enforce_statfs < enforce) 1654 tpr->pr_enforce_statfs = enforce; 1655 } 1656 if (gotrsnum) { 1657 pr->pr_devfs_rsnum = rsnum; 1658 /* Pass this restriction on to the children. */ 1659 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1660 tpr->pr_devfs_rsnum = rsnum; 1661 } 1662 if (namelc != NULL) { 1663 if (ppr == &prison0) 1664 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1665 else 1666 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1667 ppr->pr_name, namelc); 1668 /* Change this component of child names. */ 1669 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1670 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1671 strlen(tpr->pr_name + onamelen) + 1); 1672 bcopy(pr->pr_name, tpr->pr_name, namelen); 1673 } 1674 } 1675 if (path != NULL) { 1676 /* Try to keep a real-rooted full pathname. */ 1677 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1678 pr->pr_root = root; 1679 root = NULL; 1680 } 1681 if (PR_HOST & ch_flags & ~pr_flags) { 1682 if (pr->pr_flags & PR_HOST) { 1683 /* 1684 * Copy the parent's host info. As with pr_ip4 above, 1685 * the lack of a lock on the parent is not a problem; 1686 * it is always set with allprison_lock at least 1687 * shared, and is held exclusively here. 1688 */ 1689 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1690 sizeof(pr->pr_hostname)); 1691 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1692 sizeof(pr->pr_domainname)); 1693 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1694 sizeof(pr->pr_hostuuid)); 1695 pr->pr_hostid = pr->pr_parent->pr_hostid; 1696 } 1697 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1698 /* Set this prison, and any descendants without PR_HOST. */ 1699 if (host != NULL) 1700 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1701 if (domain != NULL) 1702 strlcpy(pr->pr_domainname, domain, 1703 sizeof(pr->pr_domainname)); 1704 if (uuid != NULL) 1705 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1706 if (gothid) 1707 pr->pr_hostid = hid; 1708 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1709 if (tpr->pr_flags & PR_HOST) 1710 descend = 0; 1711 else { 1712 if (host != NULL) 1713 strlcpy(tpr->pr_hostname, 1714 pr->pr_hostname, 1715 sizeof(tpr->pr_hostname)); 1716 if (domain != NULL) 1717 strlcpy(tpr->pr_domainname, 1718 pr->pr_domainname, 1719 sizeof(tpr->pr_domainname)); 1720 if (uuid != NULL) 1721 strlcpy(tpr->pr_hostuuid, 1722 pr->pr_hostuuid, 1723 sizeof(tpr->pr_hostuuid)); 1724 if (gothid) 1725 tpr->pr_hostid = hid; 1726 } 1727 } 1728 } 1729 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1730 if ((tallow = ch_allow & ~pr_allow)) 1731 prison_set_allow_locked(pr, tallow, 0); 1732 /* 1733 * Persistent prisons get an extra reference, and prisons losing their 1734 * persist flag lose that reference. Only do this for existing prisons 1735 * for now, so new ones will remain unseen until after the module 1736 * handlers have completed. 1737 */ 1738 born = !prison_isalive(pr); 1739 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1740 if (pr_flags & PR_PERSIST) { 1741 prison_hold(pr); 1742 refcount_acquire(&pr->pr_uref); 1743 } else { 1744 refcount_release(&pr->pr_ref); 1745 drflags |= PD_DEUREF; 1746 } 1747 } 1748 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1749 mtx_unlock(&pr->pr_mtx); 1750 drflags &= ~PD_LOCKED; 1751 1752 #ifdef RACCT 1753 if (racct_enable && created) 1754 prison_racct_attach(pr); 1755 #endif 1756 1757 /* Locks may have prevented a complete restriction of child IP 1758 * addresses. If so, allocate some more memory and try again. 1759 */ 1760 #ifdef INET 1761 while (redo_ip4) { 1762 ip4s = pr->pr_ip4s; 1763 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1764 mtx_lock(&pr->pr_mtx); 1765 redo_ip4 = 0; 1766 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1767 #ifdef VIMAGE 1768 if (tpr->pr_flags & PR_VNET) { 1769 descend = 0; 1770 continue; 1771 } 1772 #endif 1773 if (prison_restrict_ip4(tpr, ip4)) { 1774 if (ip4 != NULL) 1775 ip4 = NULL; 1776 else 1777 redo_ip4 = 1; 1778 } 1779 } 1780 mtx_unlock(&pr->pr_mtx); 1781 } 1782 #endif 1783 #ifdef INET6 1784 while (redo_ip6) { 1785 ip6s = pr->pr_ip6s; 1786 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1787 mtx_lock(&pr->pr_mtx); 1788 redo_ip6 = 0; 1789 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1790 #ifdef VIMAGE 1791 if (tpr->pr_flags & PR_VNET) { 1792 descend = 0; 1793 continue; 1794 } 1795 #endif 1796 if (prison_restrict_ip6(tpr, ip6)) { 1797 if (ip6 != NULL) 1798 ip6 = NULL; 1799 else 1800 redo_ip6 = 1; 1801 } 1802 } 1803 mtx_unlock(&pr->pr_mtx); 1804 } 1805 #endif 1806 1807 /* Let the modules do their work. */ 1808 sx_downgrade(&allprison_lock); 1809 drflags = (drflags & ~PD_LIST_XLOCKED) | PD_LIST_SLOCKED; 1810 if (born) { 1811 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1812 if (error) { 1813 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1814 goto done_deref; 1815 } 1816 } 1817 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1818 if (error) { 1819 if (born) 1820 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1821 goto done_deref; 1822 } 1823 1824 /* Attach this process to the prison if requested. */ 1825 if (flags & JAIL_ATTACH) { 1826 mtx_lock(&pr->pr_mtx); 1827 error = do_jail_attach(td, pr); 1828 drflags &= ~PD_LIST_SLOCKED; 1829 if (error) { 1830 if (created) { 1831 /* do_jail_attach has removed the prison. */ 1832 pr = NULL; 1833 } 1834 vfs_opterror(opts, "attach failed"); 1835 goto done_deref; 1836 } 1837 } 1838 1839 #ifdef RACCT 1840 if (racct_enable && !created) { 1841 if (drflags & PD_LIST_SLOCKED) { 1842 sx_sunlock(&allprison_lock); 1843 drflags &= ~PD_LIST_SLOCKED; 1844 } 1845 prison_racct_modify(pr); 1846 } 1847 #endif 1848 1849 td->td_retval[0] = pr->pr_id; 1850 1851 if (created) { 1852 /* 1853 * Add a reference to newly created persistent prisons 1854 * (which was not done earlier so that the prison would 1855 * not be publicly visible). 1856 */ 1857 if (pr_flags & PR_PERSIST) { 1858 mtx_lock(&pr->pr_mtx); 1859 drflags |= PD_LOCKED; 1860 refcount_acquire(&pr->pr_ref); 1861 refcount_acquire(&pr->pr_uref); 1862 } else { 1863 /* Non-persistent jails need no further changes. */ 1864 pr = NULL; 1865 } 1866 } 1867 1868 done_deref: 1869 /* Release any temporary prison holds and/or locks. */ 1870 if (pr != NULL) 1871 prison_deref(pr, drflags); 1872 else if (drflags & PD_LIST_SLOCKED) 1873 sx_sunlock(&allprison_lock); 1874 else if (drflags & PD_LIST_XLOCKED) 1875 sx_xunlock(&allprison_lock); 1876 if (root != NULL) 1877 vrele(root); 1878 done_errmsg: 1879 if (error) { 1880 /* Write the error message back to userspace. */ 1881 if (vfs_getopt(opts, "errmsg", (void **)&errmsg, 1882 &errmsg_len) == 0 && errmsg_len > 0) { 1883 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1884 if (optuio->uio_segflg == UIO_SYSSPACE) 1885 bcopy(errmsg, 1886 optuio->uio_iov[errmsg_pos].iov_base, 1887 errmsg_len); 1888 else 1889 copyout(errmsg, 1890 optuio->uio_iov[errmsg_pos].iov_base, 1891 errmsg_len); 1892 } 1893 } 1894 done_free: 1895 #ifdef INET 1896 free(ip4, M_PRISON); 1897 #endif 1898 #ifdef INET6 1899 free(ip6, M_PRISON); 1900 #endif 1901 if (g_path != NULL) 1902 free(g_path, M_TEMP); 1903 vfs_freeopts(opts); 1904 return (error); 1905 } 1906 1907 /* 1908 * Find the next available prison ID. Return the ID on success, or zero 1909 * on failure. Also set a pointer to the allprison list entry the prison 1910 * should be inserted before. 1911 */ 1912 static int 1913 get_next_prid(struct prison **insprp) 1914 { 1915 struct prison *inspr; 1916 int jid, maxid; 1917 1918 jid = lastprid % JAIL_MAX + 1; 1919 if (TAILQ_EMPTY(&allprison) || 1920 TAILQ_LAST(&allprison, prisonlist)->pr_id < jid) { 1921 /* 1922 * A common case is for all jails to be implicitly numbered, 1923 * which means they'll go on the end of the list, at least 1924 * for the first JAIL_MAX times. 1925 */ 1926 inspr = NULL; 1927 } else { 1928 /* 1929 * Take two passes through the allprison list: first starting 1930 * with the proposed jid, then ending with it. 1931 */ 1932 for (maxid = JAIL_MAX; maxid != 0; ) { 1933 TAILQ_FOREACH(inspr, &allprison, pr_list) { 1934 if (inspr->pr_id < jid) 1935 continue; 1936 if (inspr->pr_id > jid || 1937 refcount_load(&inspr->pr_ref) == 0) { 1938 /* 1939 * Found an opening. This may be a gap 1940 * in the list, or a dead jail with the 1941 * same ID. 1942 */ 1943 maxid = 0; 1944 break; 1945 } 1946 if (++jid > maxid) { 1947 if (lastprid == maxid || lastprid == 0) 1948 { 1949 /* 1950 * The entire legal range 1951 * has been traversed 1952 */ 1953 return 0; 1954 } 1955 /* Try again from the start. */ 1956 jid = 1; 1957 maxid = lastprid; 1958 break; 1959 } 1960 } 1961 if (inspr == NULL) { 1962 /* Found room at the end of the list. */ 1963 break; 1964 } 1965 } 1966 } 1967 *insprp = inspr; 1968 lastprid = jid; 1969 return (jid); 1970 } 1971 1972 /* 1973 * struct jail_get_args { 1974 * struct iovec *iovp; 1975 * unsigned int iovcnt; 1976 * int flags; 1977 * }; 1978 */ 1979 int 1980 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1981 { 1982 struct uio *auio; 1983 int error; 1984 1985 /* Check that we have an even number of iovecs. */ 1986 if (uap->iovcnt & 1) 1987 return (EINVAL); 1988 1989 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1990 if (error) 1991 return (error); 1992 error = kern_jail_get(td, auio, uap->flags); 1993 if (error == 0) 1994 error = copyout(auio->uio_iov, uap->iovp, 1995 uap->iovcnt * sizeof (struct iovec)); 1996 free(auio, M_IOV); 1997 return (error); 1998 } 1999 2000 int 2001 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 2002 { 2003 struct bool_flags *bf; 2004 struct jailsys_flags *jsf; 2005 struct prison *pr, *mypr; 2006 struct vfsopt *opt; 2007 struct vfsoptlist *opts; 2008 char *errmsg, *name; 2009 int drflags, error, errmsg_len, errmsg_pos, i, jid, len, pos; 2010 unsigned f; 2011 2012 if (flags & ~JAIL_GET_MASK) 2013 return (EINVAL); 2014 2015 /* Get the parameter list. */ 2016 error = vfs_buildopts(optuio, &opts); 2017 if (error) 2018 return (error); 2019 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 2020 mypr = td->td_ucred->cr_prison; 2021 pr = NULL; 2022 2023 /* 2024 * Find the prison specified by one of: lastjid, jid, name. 2025 */ 2026 sx_slock(&allprison_lock); 2027 drflags = PD_LIST_SLOCKED; 2028 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 2029 if (error == 0) { 2030 TAILQ_FOREACH(pr, &allprison, pr_list) { 2031 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 2032 mtx_lock(&pr->pr_mtx); 2033 if ((flags & JAIL_DYING) 2034 ? prison_isvalid(pr) : prison_isalive(pr)) 2035 break; 2036 mtx_unlock(&pr->pr_mtx); 2037 } 2038 } 2039 if (pr != NULL) { 2040 drflags |= PD_LOCKED; 2041 goto found_prison; 2042 } 2043 error = ENOENT; 2044 vfs_opterror(opts, "no jail after %d", jid); 2045 goto done; 2046 } else if (error != ENOENT) 2047 goto done; 2048 2049 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 2050 if (error == 0) { 2051 if (jid != 0) { 2052 pr = prison_find_child(mypr, jid); 2053 if (pr != NULL) { 2054 drflags |= PD_LOCKED; 2055 if (!(prison_isalive(pr) || 2056 (flags & JAIL_DYING))) { 2057 error = ENOENT; 2058 vfs_opterror(opts, "jail %d is dying", 2059 jid); 2060 goto done; 2061 } 2062 goto found_prison; 2063 } 2064 error = ENOENT; 2065 vfs_opterror(opts, "jail %d not found", jid); 2066 goto done; 2067 } 2068 } else if (error != ENOENT) 2069 goto done; 2070 2071 error = vfs_getopt(opts, "name", (void **)&name, &len); 2072 if (error == 0) { 2073 if (len == 0 || name[len - 1] != '\0') { 2074 error = EINVAL; 2075 goto done; 2076 } 2077 pr = prison_find_name(mypr, name); 2078 if (pr != NULL) { 2079 drflags |= PD_LOCKED; 2080 if (!(prison_isalive(pr) || (flags & JAIL_DYING))) { 2081 error = ENOENT; 2082 vfs_opterror(opts, "jail \"%s\" is dying", 2083 name); 2084 goto done; 2085 } 2086 goto found_prison; 2087 } 2088 error = ENOENT; 2089 vfs_opterror(opts, "jail \"%s\" not found", name); 2090 goto done; 2091 } else if (error != ENOENT) 2092 goto done; 2093 2094 vfs_opterror(opts, "no jail specified"); 2095 error = ENOENT; 2096 goto done; 2097 2098 found_prison: 2099 /* Get the parameters of the prison. */ 2100 prison_hold(pr); 2101 drflags |= PD_DEREF; 2102 td->td_retval[0] = pr->pr_id; 2103 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2104 if (error != 0 && error != ENOENT) 2105 goto done; 2106 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2107 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2108 if (error != 0 && error != ENOENT) 2109 goto done; 2110 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2111 if (error != 0 && error != ENOENT) 2112 goto done; 2113 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2114 sizeof(pr->pr_cpuset->cs_id)); 2115 if (error != 0 && error != ENOENT) 2116 goto done; 2117 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2118 if (error != 0 && error != ENOENT) 2119 goto done; 2120 #ifdef INET 2121 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2122 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2123 if (error != 0 && error != ENOENT) 2124 goto done; 2125 #endif 2126 #ifdef INET6 2127 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2128 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2129 if (error != 0 && error != ENOENT) 2130 goto done; 2131 #endif 2132 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2133 sizeof(pr->pr_securelevel)); 2134 if (error != 0 && error != ENOENT) 2135 goto done; 2136 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2137 sizeof(pr->pr_childcount)); 2138 if (error != 0 && error != ENOENT) 2139 goto done; 2140 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2141 sizeof(pr->pr_childmax)); 2142 if (error != 0 && error != ENOENT) 2143 goto done; 2144 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2145 if (error != 0 && error != ENOENT) 2146 goto done; 2147 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2148 if (error != 0 && error != ENOENT) 2149 goto done; 2150 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2151 if (error != 0 && error != ENOENT) 2152 goto done; 2153 #ifdef COMPAT_FREEBSD32 2154 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2155 uint32_t hid32 = pr->pr_hostid; 2156 2157 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2158 } else 2159 #endif 2160 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2161 sizeof(pr->pr_hostid)); 2162 if (error != 0 && error != ENOENT) 2163 goto done; 2164 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2165 sizeof(pr->pr_enforce_statfs)); 2166 if (error != 0 && error != ENOENT) 2167 goto done; 2168 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2169 sizeof(pr->pr_devfs_rsnum)); 2170 if (error != 0 && error != ENOENT) 2171 goto done; 2172 for (bf = pr_flag_bool; 2173 bf < pr_flag_bool + nitems(pr_flag_bool); 2174 bf++) { 2175 i = (pr->pr_flags & bf->flag) ? 1 : 0; 2176 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2177 if (error != 0 && error != ENOENT) 2178 goto done; 2179 i = !i; 2180 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2181 if (error != 0 && error != ENOENT) 2182 goto done; 2183 } 2184 for (jsf = pr_flag_jailsys; 2185 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 2186 jsf++) { 2187 f = pr->pr_flags & (jsf->disable | jsf->new); 2188 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE 2189 : (f == jsf->new) ? JAIL_SYS_NEW 2190 : JAIL_SYS_INHERIT; 2191 error = vfs_setopt(opts, jsf->name, &i, sizeof(i)); 2192 if (error != 0 && error != ENOENT) 2193 goto done; 2194 } 2195 for (bf = pr_flag_allow; 2196 bf < pr_flag_allow + nitems(pr_flag_allow) && 2197 atomic_load_int(&bf->flag) != 0; 2198 bf++) { 2199 i = (pr->pr_allow & bf->flag) ? 1 : 0; 2200 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2201 if (error != 0 && error != ENOENT) 2202 goto done; 2203 i = !i; 2204 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2205 if (error != 0 && error != ENOENT) 2206 goto done; 2207 } 2208 i = !prison_isalive(pr); 2209 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2210 if (error != 0 && error != ENOENT) 2211 goto done; 2212 i = !i; 2213 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2214 if (error != 0 && error != ENOENT) 2215 goto done; 2216 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2217 sizeof(pr->pr_osreldate)); 2218 if (error != 0 && error != ENOENT) 2219 goto done; 2220 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2221 if (error != 0 && error != ENOENT) 2222 goto done; 2223 2224 /* Get the module parameters. */ 2225 mtx_unlock(&pr->pr_mtx); 2226 drflags &= ~PD_LOCKED; 2227 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2228 if (error) 2229 goto done; 2230 prison_deref(pr, drflags); 2231 pr = NULL; 2232 drflags = 0; 2233 2234 /* By now, all parameters should have been noted. */ 2235 TAILQ_FOREACH(opt, opts, link) { 2236 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2237 error = EINVAL; 2238 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2239 goto done; 2240 } 2241 } 2242 2243 /* Write the fetched parameters back to userspace. */ 2244 error = 0; 2245 TAILQ_FOREACH(opt, opts, link) { 2246 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2247 pos = 2 * opt->pos + 1; 2248 optuio->uio_iov[pos].iov_len = opt->len; 2249 if (opt->value != NULL) { 2250 if (optuio->uio_segflg == UIO_SYSSPACE) { 2251 bcopy(opt->value, 2252 optuio->uio_iov[pos].iov_base, 2253 opt->len); 2254 } else { 2255 error = copyout(opt->value, 2256 optuio->uio_iov[pos].iov_base, 2257 opt->len); 2258 if (error) 2259 break; 2260 } 2261 } 2262 } 2263 } 2264 2265 done: 2266 /* Release any temporary prison holds and/or locks. */ 2267 if (pr != NULL) 2268 prison_deref(pr, drflags); 2269 else if (drflags & PD_LIST_SLOCKED) 2270 sx_sunlock(&allprison_lock); 2271 if (error && errmsg_pos >= 0) { 2272 /* Write the error message back to userspace. */ 2273 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2274 errmsg_pos = 2 * errmsg_pos + 1; 2275 if (errmsg_len > 0) { 2276 if (optuio->uio_segflg == UIO_SYSSPACE) 2277 bcopy(errmsg, 2278 optuio->uio_iov[errmsg_pos].iov_base, 2279 errmsg_len); 2280 else 2281 copyout(errmsg, 2282 optuio->uio_iov[errmsg_pos].iov_base, 2283 errmsg_len); 2284 } 2285 } 2286 vfs_freeopts(opts); 2287 return (error); 2288 } 2289 2290 /* 2291 * struct jail_remove_args { 2292 * int jid; 2293 * }; 2294 */ 2295 int 2296 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2297 { 2298 struct prison *pr, *cpr, *lpr, *tpr; 2299 int descend, error; 2300 2301 error = priv_check(td, PRIV_JAIL_REMOVE); 2302 if (error) 2303 return (error); 2304 2305 sx_xlock(&allprison_lock); 2306 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2307 if (pr == NULL) { 2308 sx_xunlock(&allprison_lock); 2309 return (EINVAL); 2310 } 2311 2312 /* Remove all descendants of this prison, then remove this prison. */ 2313 prison_hold(pr); 2314 if (!LIST_EMPTY(&pr->pr_children)) { 2315 mtx_unlock(&pr->pr_mtx); 2316 lpr = NULL; 2317 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2318 mtx_lock(&cpr->pr_mtx); 2319 if (prison_isvalid(cpr)) { 2320 tpr = cpr; 2321 prison_hold(cpr); 2322 } else { 2323 /* Already removed - do not do it again. */ 2324 tpr = NULL; 2325 } 2326 mtx_unlock(&cpr->pr_mtx); 2327 if (lpr != NULL) { 2328 mtx_lock(&lpr->pr_mtx); 2329 prison_remove_one(lpr); 2330 sx_xlock(&allprison_lock); 2331 } 2332 lpr = tpr; 2333 } 2334 if (lpr != NULL) { 2335 mtx_lock(&lpr->pr_mtx); 2336 prison_remove_one(lpr); 2337 sx_xlock(&allprison_lock); 2338 } 2339 mtx_lock(&pr->pr_mtx); 2340 } 2341 prison_remove_one(pr); 2342 return (0); 2343 } 2344 2345 static void 2346 prison_remove_one(struct prison *pr) 2347 { 2348 struct proc *p; 2349 int drflags; 2350 2351 drflags = PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED; 2352 2353 /* If the prison was persistent, it is not anymore. */ 2354 if (pr->pr_flags & PR_PERSIST) { 2355 refcount_release(&pr->pr_ref); 2356 drflags |= PD_DEUREF; 2357 pr->pr_flags &= ~PR_PERSIST; 2358 } 2359 2360 /* 2361 * jail_remove added a reference. If that's the only one, remove 2362 * the prison now. refcount(9) doesn't guarantee the cache coherence 2363 * of non-zero counters, so force it here. 2364 */ 2365 KASSERT(refcount_load(&pr->pr_ref) > 0, 2366 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2367 if (atomic_load_acq_int(&pr->pr_ref) == 1) { 2368 prison_deref(pr, drflags); 2369 return; 2370 } 2371 2372 mtx_unlock(&pr->pr_mtx); 2373 sx_xunlock(&allprison_lock); 2374 drflags &= ~(PD_LOCKED | PD_LIST_XLOCKED); 2375 /* 2376 * Kill all processes unfortunate enough to be attached to this prison. 2377 */ 2378 sx_slock(&allproc_lock); 2379 FOREACH_PROC_IN_SYSTEM(p) { 2380 PROC_LOCK(p); 2381 if (p->p_state != PRS_NEW && p->p_ucred && 2382 p->p_ucred->cr_prison == pr) 2383 kern_psignal(p, SIGKILL); 2384 PROC_UNLOCK(p); 2385 } 2386 sx_sunlock(&allproc_lock); 2387 /* Remove the temporary reference added by jail_remove. */ 2388 prison_deref(pr, drflags); 2389 } 2390 2391 /* 2392 * struct jail_attach_args { 2393 * int jid; 2394 * }; 2395 */ 2396 int 2397 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2398 { 2399 struct prison *pr; 2400 int error; 2401 2402 error = priv_check(td, PRIV_JAIL_ATTACH); 2403 if (error) 2404 return (error); 2405 2406 /* 2407 * Start with exclusive hold on allprison_lock to ensure that a possible 2408 * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove. 2409 * But then immediately downgrade it since we don't need to stop 2410 * readers. 2411 */ 2412 sx_xlock(&allprison_lock); 2413 sx_downgrade(&allprison_lock); 2414 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2415 if (pr == NULL) { 2416 sx_sunlock(&allprison_lock); 2417 return (EINVAL); 2418 } 2419 2420 /* Do not allow a process to attach to a prison that is not alive. */ 2421 if (!prison_isalive(pr)) { 2422 mtx_unlock(&pr->pr_mtx); 2423 sx_sunlock(&allprison_lock); 2424 return (EINVAL); 2425 } 2426 2427 return (do_jail_attach(td, pr)); 2428 } 2429 2430 static int 2431 do_jail_attach(struct thread *td, struct prison *pr) 2432 { 2433 struct proc *p; 2434 struct ucred *newcred, *oldcred; 2435 int error; 2436 2437 /* 2438 * XXX: Note that there is a slight race here if two threads 2439 * in the same privileged process attempt to attach to two 2440 * different jails at the same time. It is important for 2441 * user processes not to do this, or they might end up with 2442 * a process root from one prison, but attached to the jail 2443 * of another. 2444 */ 2445 refcount_acquire(&pr->pr_ref); 2446 refcount_acquire(&pr->pr_uref); 2447 mtx_unlock(&pr->pr_mtx); 2448 2449 /* Let modules do whatever they need to prepare for attaching. */ 2450 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2451 if (error) { 2452 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2453 return (error); 2454 } 2455 sx_sunlock(&allprison_lock); 2456 2457 /* 2458 * Reparent the newly attached process to this jail. 2459 */ 2460 p = td->td_proc; 2461 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2462 if (error) 2463 goto e_revert_osd; 2464 2465 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2466 if ((error = change_dir(pr->pr_root, td)) != 0) 2467 goto e_unlock; 2468 #ifdef MAC 2469 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2470 goto e_unlock; 2471 #endif 2472 VOP_UNLOCK(pr->pr_root); 2473 if ((error = pwd_chroot(td, pr->pr_root))) 2474 goto e_revert_osd; 2475 2476 newcred = crget(); 2477 PROC_LOCK(p); 2478 oldcred = crcopysafe(p, newcred); 2479 newcred->cr_prison = pr; 2480 proc_set_cred(p, newcred); 2481 setsugid(p); 2482 #ifdef RACCT 2483 racct_proc_ucred_changed(p, oldcred, newcred); 2484 crhold(newcred); 2485 #endif 2486 PROC_UNLOCK(p); 2487 #ifdef RCTL 2488 rctl_proc_ucred_changed(p, newcred); 2489 crfree(newcred); 2490 #endif 2491 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF); 2492 crfree(oldcred); 2493 return (0); 2494 2495 e_unlock: 2496 VOP_UNLOCK(pr->pr_root); 2497 e_revert_osd: 2498 /* Tell modules this thread is still in its old jail after all. */ 2499 sx_slock(&allprison_lock); 2500 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2501 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2502 return (error); 2503 } 2504 2505 /* 2506 * Returns a locked prison instance, or NULL on failure. 2507 */ 2508 struct prison * 2509 prison_find(int prid) 2510 { 2511 struct prison *pr; 2512 2513 sx_assert(&allprison_lock, SX_LOCKED); 2514 TAILQ_FOREACH(pr, &allprison, pr_list) { 2515 if (pr->pr_id == prid) { 2516 mtx_lock(&pr->pr_mtx); 2517 if (prison_isvalid(pr)) 2518 return (pr); 2519 /* 2520 * Any active prison with the same ID would have 2521 * been inserted before a dead one. 2522 */ 2523 mtx_unlock(&pr->pr_mtx); 2524 break; 2525 } 2526 if (pr->pr_id > prid) 2527 break; 2528 } 2529 return (NULL); 2530 } 2531 2532 /* 2533 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2534 */ 2535 struct prison * 2536 prison_find_child(struct prison *mypr, int prid) 2537 { 2538 struct prison *pr; 2539 int descend; 2540 2541 sx_assert(&allprison_lock, SX_LOCKED); 2542 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2543 if (pr->pr_id == prid) { 2544 mtx_lock(&pr->pr_mtx); 2545 if (prison_isvalid(pr)) 2546 return (pr); 2547 mtx_unlock(&pr->pr_mtx); 2548 } 2549 } 2550 return (NULL); 2551 } 2552 2553 /* 2554 * Look for the name relative to mypr. Returns a locked prison or NULL. 2555 */ 2556 struct prison * 2557 prison_find_name(struct prison *mypr, const char *name) 2558 { 2559 struct prison *pr, *deadpr; 2560 size_t mylen; 2561 int descend; 2562 2563 sx_assert(&allprison_lock, SX_LOCKED); 2564 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2565 again: 2566 deadpr = NULL; 2567 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2568 if (!strcmp(pr->pr_name + mylen, name)) { 2569 mtx_lock(&pr->pr_mtx); 2570 if (prison_isalive(pr)) 2571 return (pr); 2572 if (prison_isvalid(pr)) 2573 deadpr = pr; 2574 mtx_unlock(&pr->pr_mtx); 2575 } 2576 } 2577 /* There was no valid prison - perhaps there was a dying one. */ 2578 if (deadpr != NULL) { 2579 mtx_lock(&deadpr->pr_mtx); 2580 if (!prison_isvalid(deadpr)) { 2581 mtx_unlock(&deadpr->pr_mtx); 2582 goto again; 2583 } 2584 } 2585 return (deadpr); 2586 } 2587 2588 /* 2589 * See if a prison has the specific flag set. The prison should be locked, 2590 * unless checking for flags that are only set at jail creation (such as 2591 * PR_IP4 and PR_IP6), or only the single bit is examined, without regard 2592 * to any other prison data. 2593 */ 2594 int 2595 prison_flag(struct ucred *cred, unsigned flag) 2596 { 2597 2598 return (cred->cr_prison->pr_flags & flag); 2599 } 2600 2601 int 2602 prison_allow(struct ucred *cred, unsigned flag) 2603 { 2604 2605 return ((cred->cr_prison->pr_allow & flag) != 0); 2606 } 2607 2608 /* 2609 * Hold a prison reference, by incrementing pr_ref. It is generally 2610 * an error to hold a prison that does not already have a reference. 2611 * A prison record will remain valid as long as it has at least one 2612 * reference, and will not be removed as long as either the prison 2613 * mutex or the allprison lock is held (allprison_lock may be shared). 2614 */ 2615 void 2616 prison_hold_locked(struct prison *pr) 2617 { 2618 2619 /* Locking is no longer required. */ 2620 prison_hold(pr); 2621 } 2622 2623 void 2624 prison_hold(struct prison *pr) 2625 { 2626 #ifdef INVARIANTS 2627 int was_valid = refcount_acquire_if_not_zero(&pr->pr_ref); 2628 2629 KASSERT(was_valid, 2630 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id)); 2631 #else 2632 refcount_acquire(&pr->pr_ref); 2633 #endif 2634 } 2635 2636 /* 2637 * Remove a prison reference. If that was the last reference, the 2638 * prison will be removed (at a later time). Return with the prison 2639 * unlocked. 2640 */ 2641 void 2642 prison_free_locked(struct prison *pr) 2643 { 2644 int lastref; 2645 2646 mtx_assert(&pr->pr_mtx, MA_OWNED); 2647 KASSERT(refcount_load(&pr->pr_ref) > 0, 2648 ("Trying to free dead prison %p (jid=%d).", 2649 pr, pr->pr_id)); 2650 lastref = refcount_release(&pr->pr_ref); 2651 mtx_unlock(&pr->pr_mtx); 2652 if (lastref) { 2653 /* 2654 * Don't remove the prison itself in this context, 2655 * in case there are locks held. 2656 */ 2657 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2658 } 2659 } 2660 2661 void 2662 prison_free(struct prison *pr) 2663 { 2664 2665 /* 2666 * Locking is only required when releasing the last reference. 2667 * This allows assurance that a locked prison will remain valid 2668 * until it is unlocked. 2669 */ 2670 KASSERT(refcount_load(&pr->pr_ref) > 0, 2671 ("Trying to free dead prison %p (jid=%d).", 2672 pr, pr->pr_id)); 2673 if (refcount_release_if_not_last(&pr->pr_ref)) 2674 return; 2675 mtx_lock(&pr->pr_mtx); 2676 prison_free_locked(pr); 2677 } 2678 2679 /* 2680 * Hold a a prison for user visibility, by incrementing pr_uref. 2681 * It is generally an error to hold a prison that isn't already 2682 * user-visible, except through the the jail system calls. It is also 2683 * an error to hold an invalid prison. A prison record will remain 2684 * alive as long as it has at least one user reference, and will not 2685 * be set to the dying state was long as the prison mutex is held. 2686 */ 2687 void 2688 prison_proc_hold(struct prison *pr) 2689 { 2690 #ifdef INVARIANTS 2691 int was_alive = refcount_acquire_if_not_zero(&pr->pr_uref); 2692 2693 KASSERT(was_alive, 2694 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2695 #else 2696 refcount_acquire(&pr->pr_uref); 2697 #endif 2698 } 2699 2700 /* 2701 * Remove a prison user reference. If it was the last reference, the 2702 * prison will be considered "dying", and may be removed once all of 2703 * its references are dropped. 2704 */ 2705 void 2706 prison_proc_free(struct prison *pr) 2707 { 2708 2709 /* 2710 * Locking is only required when releasing the last reference. 2711 * This allows assurance that a locked prison will remain alive 2712 * until it is unlocked. 2713 */ 2714 KASSERT(refcount_load(&pr->pr_uref) > 0, 2715 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2716 if (!refcount_release_if_not_last(&pr->pr_uref)) { 2717 /* 2718 * Don't remove the last user reference in this context, 2719 * which is expected to be a process that is not only locked, 2720 * but also half dead. Add a reference so any calls to 2721 * prison_free() won't re-submit the task. 2722 */ 2723 refcount_acquire(&pr->pr_ref); 2724 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2725 } 2726 } 2727 2728 /* 2729 * Complete a call to either prison_free or prison_proc_free. 2730 */ 2731 static void 2732 prison_complete(void *context, int pending) 2733 { 2734 struct prison *pr = context; 2735 2736 sx_xlock(&allprison_lock); 2737 mtx_lock(&pr->pr_mtx); 2738 /* 2739 * If this is completing a call to prison_proc_free, there will still 2740 * be a user reference held; clear that as well as the reference that 2741 * was added. No references are expected if this is completing a call 2742 * to prison_free, but prison_deref is still called for the cleanup. 2743 */ 2744 prison_deref(pr, refcount_load(&pr->pr_uref) > 0 2745 ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED 2746 : PD_LOCKED | PD_LIST_XLOCKED); 2747 } 2748 2749 /* 2750 * Remove a prison reference and/or user reference (usually). 2751 * This assumes context that allows sleeping (for allprison_lock), 2752 * with no non-sleeping locks held, except perhaps the prison itself. 2753 * If there are no more references, release and delist the prison. 2754 * On completion, the prison lock and the allprison lock are both 2755 * unlocked. 2756 */ 2757 static void 2758 prison_deref(struct prison *pr, int flags) 2759 { 2760 struct prison *ppr, *tpr; 2761 int lastref, lasturef; 2762 2763 if (!(flags & PD_LOCKED)) 2764 mtx_lock(&pr->pr_mtx); 2765 for (;;) { 2766 if (flags & PD_DEUREF) { 2767 KASSERT(refcount_load(&pr->pr_uref) > 0, 2768 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 2769 pr->pr_id)); 2770 lasturef = refcount_release(&pr->pr_uref); 2771 if (lasturef) 2772 refcount_acquire(&pr->pr_ref); 2773 KASSERT(refcount_load(&prison0.pr_uref) > 0, 2774 ("prison0 pr_uref=0")); 2775 } else 2776 lasturef = 0; 2777 if (flags & PD_DEREF) { 2778 KASSERT(refcount_load(&pr->pr_ref) > 0, 2779 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 2780 pr->pr_id)); 2781 lastref = refcount_release(&pr->pr_ref); 2782 } 2783 else 2784 lastref = refcount_load(&pr->pr_ref) == 0; 2785 mtx_unlock(&pr->pr_mtx); 2786 2787 /* 2788 * Tell the modules if the last user reference was removed 2789 * (even it sticks around in dying state). 2790 */ 2791 if (lasturef) { 2792 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) { 2793 if (atomic_load_acq_int(&pr->pr_ref) > 1) { 2794 sx_slock(&allprison_lock); 2795 flags |= PD_LIST_SLOCKED; 2796 } else { 2797 sx_xlock(&allprison_lock); 2798 flags |= PD_LIST_XLOCKED; 2799 } 2800 } 2801 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 2802 mtx_lock(&pr->pr_mtx); 2803 lastref = refcount_release(&pr->pr_ref); 2804 mtx_unlock(&pr->pr_mtx); 2805 } 2806 2807 /* If the prison still has references, nothing else to do. */ 2808 if (!lastref) { 2809 if (flags & PD_LIST_SLOCKED) 2810 sx_sunlock(&allprison_lock); 2811 else if (flags & PD_LIST_XLOCKED) 2812 sx_xunlock(&allprison_lock); 2813 return; 2814 } 2815 2816 if (flags & PD_LIST_SLOCKED) { 2817 if (!sx_try_upgrade(&allprison_lock)) { 2818 sx_sunlock(&allprison_lock); 2819 sx_xlock(&allprison_lock); 2820 } 2821 } else if (!(flags & PD_LIST_XLOCKED)) 2822 sx_xlock(&allprison_lock); 2823 2824 TAILQ_REMOVE(&allprison, pr, pr_list); 2825 LIST_REMOVE(pr, pr_sibling); 2826 ppr = pr->pr_parent; 2827 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2828 tpr->pr_childcount--; 2829 sx_xunlock(&allprison_lock); 2830 2831 #ifdef VIMAGE 2832 if (pr->pr_vnet != ppr->pr_vnet) 2833 vnet_destroy(pr->pr_vnet); 2834 #endif 2835 if (pr->pr_root != NULL) 2836 vrele(pr->pr_root); 2837 mtx_destroy(&pr->pr_mtx); 2838 #ifdef INET 2839 free(pr->pr_ip4, M_PRISON); 2840 #endif 2841 #ifdef INET6 2842 free(pr->pr_ip6, M_PRISON); 2843 #endif 2844 if (pr->pr_cpuset != NULL) 2845 cpuset_rel(pr->pr_cpuset); 2846 osd_jail_exit(pr); 2847 #ifdef RACCT 2848 if (racct_enable) 2849 prison_racct_detach(pr); 2850 #endif 2851 free(pr, M_PRISON); 2852 2853 /* Removing a prison frees a reference on its parent. */ 2854 pr = ppr; 2855 mtx_lock(&pr->pr_mtx); 2856 flags = PD_DEREF | PD_DEUREF; 2857 } 2858 } 2859 2860 /* 2861 * Set or clear a permission bit in the pr_allow field, passing restrictions 2862 * (cleared permission) down to child jails. 2863 */ 2864 void 2865 prison_set_allow(struct ucred *cred, unsigned flag, int enable) 2866 { 2867 struct prison *pr; 2868 2869 pr = cred->cr_prison; 2870 sx_slock(&allprison_lock); 2871 mtx_lock(&pr->pr_mtx); 2872 prison_set_allow_locked(pr, flag, enable); 2873 mtx_unlock(&pr->pr_mtx); 2874 sx_sunlock(&allprison_lock); 2875 } 2876 2877 static void 2878 prison_set_allow_locked(struct prison *pr, unsigned flag, int enable) 2879 { 2880 struct prison *cpr; 2881 int descend; 2882 2883 if (enable != 0) 2884 pr->pr_allow |= flag; 2885 else { 2886 pr->pr_allow &= ~flag; 2887 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 2888 cpr->pr_allow &= ~flag; 2889 } 2890 } 2891 2892 /* 2893 * Check if a jail supports the given address family. 2894 * 2895 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 2896 * if not. 2897 */ 2898 int 2899 prison_check_af(struct ucred *cred, int af) 2900 { 2901 struct prison *pr; 2902 int error; 2903 2904 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2905 2906 pr = cred->cr_prison; 2907 #ifdef VIMAGE 2908 /* Prisons with their own network stack are not limited. */ 2909 if (prison_owns_vnet(cred)) 2910 return (0); 2911 #endif 2912 2913 error = 0; 2914 switch (af) 2915 { 2916 #ifdef INET 2917 case AF_INET: 2918 if (pr->pr_flags & PR_IP4) 2919 { 2920 mtx_lock(&pr->pr_mtx); 2921 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 2922 error = EAFNOSUPPORT; 2923 mtx_unlock(&pr->pr_mtx); 2924 } 2925 break; 2926 #endif 2927 #ifdef INET6 2928 case AF_INET6: 2929 if (pr->pr_flags & PR_IP6) 2930 { 2931 mtx_lock(&pr->pr_mtx); 2932 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 2933 error = EAFNOSUPPORT; 2934 mtx_unlock(&pr->pr_mtx); 2935 } 2936 break; 2937 #endif 2938 case AF_LOCAL: 2939 case AF_ROUTE: 2940 break; 2941 default: 2942 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 2943 error = EAFNOSUPPORT; 2944 } 2945 return (error); 2946 } 2947 2948 /* 2949 * Check if given address belongs to the jail referenced by cred (wrapper to 2950 * prison_check_ip[46]). 2951 * 2952 * Returns 0 if jail doesn't restrict the address family or if address belongs 2953 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 2954 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 2955 */ 2956 int 2957 prison_if(struct ucred *cred, const struct sockaddr *sa) 2958 { 2959 #ifdef INET 2960 const struct sockaddr_in *sai; 2961 #endif 2962 #ifdef INET6 2963 const struct sockaddr_in6 *sai6; 2964 #endif 2965 int error; 2966 2967 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2968 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 2969 2970 #ifdef VIMAGE 2971 if (prison_owns_vnet(cred)) 2972 return (0); 2973 #endif 2974 2975 error = 0; 2976 switch (sa->sa_family) 2977 { 2978 #ifdef INET 2979 case AF_INET: 2980 sai = (const struct sockaddr_in *)sa; 2981 error = prison_check_ip4(cred, &sai->sin_addr); 2982 break; 2983 #endif 2984 #ifdef INET6 2985 case AF_INET6: 2986 sai6 = (const struct sockaddr_in6 *)sa; 2987 error = prison_check_ip6(cred, &sai6->sin6_addr); 2988 break; 2989 #endif 2990 default: 2991 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 2992 error = EAFNOSUPPORT; 2993 } 2994 return (error); 2995 } 2996 2997 /* 2998 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 2999 */ 3000 int 3001 prison_check(struct ucred *cred1, struct ucred *cred2) 3002 { 3003 3004 return ((cred1->cr_prison == cred2->cr_prison || 3005 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3006 } 3007 3008 /* 3009 * Return 1 if p2 is a child of p1, otherwise 0. 3010 */ 3011 int 3012 prison_ischild(struct prison *pr1, struct prison *pr2) 3013 { 3014 3015 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3016 if (pr1 == pr2) 3017 return (1); 3018 return (0); 3019 } 3020 3021 /* 3022 * Return true if the prison is currently alive. A prison is alive if it is 3023 * valid and it holds user references. 3024 */ 3025 bool 3026 prison_isalive(struct prison *pr) 3027 { 3028 3029 mtx_assert(&pr->pr_mtx, MA_OWNED); 3030 if (__predict_false(refcount_load(&pr->pr_ref) == 0)) 3031 return (false); 3032 if (__predict_false(refcount_load(&pr->pr_uref) == 0)) 3033 return (false); 3034 return (true); 3035 } 3036 3037 /* 3038 * Return true if the prison is currently valid. A prison is valid if it has 3039 * been fully created, and is not being destroyed. Note that dying prisons 3040 * are still considered valid. 3041 */ 3042 bool 3043 prison_isvalid(struct prison *pr) 3044 { 3045 3046 mtx_assert(&pr->pr_mtx, MA_OWNED); 3047 if (__predict_false(refcount_load(&pr->pr_ref) == 0)) 3048 return (false); 3049 return (true); 3050 } 3051 3052 /* 3053 * Return 1 if the passed credential is in a jail and that jail does not 3054 * have its own virtual network stack, otherwise 0. 3055 */ 3056 int 3057 jailed_without_vnet(struct ucred *cred) 3058 { 3059 3060 if (!jailed(cred)) 3061 return (0); 3062 #ifdef VIMAGE 3063 if (prison_owns_vnet(cred)) 3064 return (0); 3065 #endif 3066 3067 return (1); 3068 } 3069 3070 /* 3071 * Return the correct hostname (domainname, et al) for the passed credential. 3072 */ 3073 void 3074 getcredhostname(struct ucred *cred, char *buf, size_t size) 3075 { 3076 struct prison *pr; 3077 3078 /* 3079 * A NULL credential can be used to shortcut to the physical 3080 * system's hostname. 3081 */ 3082 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3083 mtx_lock(&pr->pr_mtx); 3084 strlcpy(buf, pr->pr_hostname, size); 3085 mtx_unlock(&pr->pr_mtx); 3086 } 3087 3088 void 3089 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3090 { 3091 3092 mtx_lock(&cred->cr_prison->pr_mtx); 3093 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3094 mtx_unlock(&cred->cr_prison->pr_mtx); 3095 } 3096 3097 void 3098 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3099 { 3100 3101 mtx_lock(&cred->cr_prison->pr_mtx); 3102 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3103 mtx_unlock(&cred->cr_prison->pr_mtx); 3104 } 3105 3106 void 3107 getcredhostid(struct ucred *cred, unsigned long *hostid) 3108 { 3109 3110 mtx_lock(&cred->cr_prison->pr_mtx); 3111 *hostid = cred->cr_prison->pr_hostid; 3112 mtx_unlock(&cred->cr_prison->pr_mtx); 3113 } 3114 3115 void 3116 getjailname(struct ucred *cred, char *name, size_t len) 3117 { 3118 3119 mtx_lock(&cred->cr_prison->pr_mtx); 3120 strlcpy(name, cred->cr_prison->pr_name, len); 3121 mtx_unlock(&cred->cr_prison->pr_mtx); 3122 } 3123 3124 #ifdef VIMAGE 3125 /* 3126 * Determine whether the prison represented by cred owns 3127 * its vnet rather than having it inherited. 3128 * 3129 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3130 */ 3131 int 3132 prison_owns_vnet(struct ucred *cred) 3133 { 3134 3135 /* 3136 * vnets cannot be added/removed after jail creation, 3137 * so no need to lock here. 3138 */ 3139 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3140 } 3141 #endif 3142 3143 /* 3144 * Determine whether the subject represented by cred can "see" 3145 * status of a mount point. 3146 * Returns: 0 for permitted, ENOENT otherwise. 3147 * XXX: This function should be called cr_canseemount() and should be 3148 * placed in kern_prot.c. 3149 */ 3150 int 3151 prison_canseemount(struct ucred *cred, struct mount *mp) 3152 { 3153 struct prison *pr; 3154 struct statfs *sp; 3155 size_t len; 3156 3157 pr = cred->cr_prison; 3158 if (pr->pr_enforce_statfs == 0) 3159 return (0); 3160 if (pr->pr_root->v_mount == mp) 3161 return (0); 3162 if (pr->pr_enforce_statfs == 2) 3163 return (ENOENT); 3164 /* 3165 * If jail's chroot directory is set to "/" we should be able to see 3166 * all mount-points from inside a jail. 3167 * This is ugly check, but this is the only situation when jail's 3168 * directory ends with '/'. 3169 */ 3170 if (strcmp(pr->pr_path, "/") == 0) 3171 return (0); 3172 len = strlen(pr->pr_path); 3173 sp = &mp->mnt_stat; 3174 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3175 return (ENOENT); 3176 /* 3177 * Be sure that we don't have situation where jail's root directory 3178 * is "/some/path" and mount point is "/some/pathpath". 3179 */ 3180 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3181 return (ENOENT); 3182 return (0); 3183 } 3184 3185 void 3186 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3187 { 3188 char jpath[MAXPATHLEN]; 3189 struct prison *pr; 3190 size_t len; 3191 3192 pr = cred->cr_prison; 3193 if (pr->pr_enforce_statfs == 0) 3194 return; 3195 if (prison_canseemount(cred, mp) != 0) { 3196 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3197 strlcpy(sp->f_mntonname, "[restricted]", 3198 sizeof(sp->f_mntonname)); 3199 return; 3200 } 3201 if (pr->pr_root->v_mount == mp) { 3202 /* 3203 * Clear current buffer data, so we are sure nothing from 3204 * the valid path left there. 3205 */ 3206 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3207 *sp->f_mntonname = '/'; 3208 return; 3209 } 3210 /* 3211 * If jail's chroot directory is set to "/" we should be able to see 3212 * all mount-points from inside a jail. 3213 */ 3214 if (strcmp(pr->pr_path, "/") == 0) 3215 return; 3216 len = strlen(pr->pr_path); 3217 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3218 /* 3219 * Clear current buffer data, so we are sure nothing from 3220 * the valid path left there. 3221 */ 3222 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3223 if (*jpath == '\0') { 3224 /* Should never happen. */ 3225 *sp->f_mntonname = '/'; 3226 } else { 3227 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3228 } 3229 } 3230 3231 /* 3232 * Check with permission for a specific privilege is granted within jail. We 3233 * have a specific list of accepted privileges; the rest are denied. 3234 */ 3235 int 3236 prison_priv_check(struct ucred *cred, int priv) 3237 { 3238 struct prison *pr; 3239 int error; 3240 3241 /* 3242 * Some policies have custom handlers. This routine should not be 3243 * called for them. See priv_check_cred(). 3244 */ 3245 switch (priv) { 3246 case PRIV_VFS_LOOKUP: 3247 case PRIV_VFS_GENERATION: 3248 KASSERT(0, ("prison_priv_check instead of a custom handler " 3249 "called for %d\n", priv)); 3250 } 3251 3252 if (!jailed(cred)) 3253 return (0); 3254 3255 #ifdef VIMAGE 3256 /* 3257 * Privileges specific to prisons with a virtual network stack. 3258 * There might be a duplicate entry here in case the privilege 3259 * is only granted conditionally in the legacy jail case. 3260 */ 3261 switch (priv) { 3262 #ifdef notyet 3263 /* 3264 * NFS-specific privileges. 3265 */ 3266 case PRIV_NFS_DAEMON: 3267 case PRIV_NFS_LOCKD: 3268 #endif 3269 /* 3270 * Network stack privileges. 3271 */ 3272 case PRIV_NET_BRIDGE: 3273 case PRIV_NET_GRE: 3274 case PRIV_NET_BPF: 3275 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3276 case PRIV_NET_ROUTE: 3277 case PRIV_NET_TAP: 3278 case PRIV_NET_SETIFMTU: 3279 case PRIV_NET_SETIFFLAGS: 3280 case PRIV_NET_SETIFCAP: 3281 case PRIV_NET_SETIFDESCR: 3282 case PRIV_NET_SETIFNAME : 3283 case PRIV_NET_SETIFMETRIC: 3284 case PRIV_NET_SETIFPHYS: 3285 case PRIV_NET_SETIFMAC: 3286 case PRIV_NET_SETLANPCP: 3287 case PRIV_NET_ADDMULTI: 3288 case PRIV_NET_DELMULTI: 3289 case PRIV_NET_HWIOCTL: 3290 case PRIV_NET_SETLLADDR: 3291 case PRIV_NET_ADDIFGROUP: 3292 case PRIV_NET_DELIFGROUP: 3293 case PRIV_NET_IFCREATE: 3294 case PRIV_NET_IFDESTROY: 3295 case PRIV_NET_ADDIFADDR: 3296 case PRIV_NET_DELIFADDR: 3297 case PRIV_NET_LAGG: 3298 case PRIV_NET_GIF: 3299 case PRIV_NET_SETIFVNET: 3300 case PRIV_NET_SETIFFIB: 3301 3302 /* 3303 * 802.11-related privileges. 3304 */ 3305 case PRIV_NET80211_VAP_GETKEY: 3306 case PRIV_NET80211_VAP_MANAGE: 3307 3308 #ifdef notyet 3309 /* 3310 * ATM privileges. 3311 */ 3312 case PRIV_NETATM_CFG: 3313 case PRIV_NETATM_ADD: 3314 case PRIV_NETATM_DEL: 3315 case PRIV_NETATM_SET: 3316 3317 /* 3318 * Bluetooth privileges. 3319 */ 3320 case PRIV_NETBLUETOOTH_RAW: 3321 #endif 3322 3323 /* 3324 * Netgraph and netgraph module privileges. 3325 */ 3326 case PRIV_NETGRAPH_CONTROL: 3327 #ifdef notyet 3328 case PRIV_NETGRAPH_TTY: 3329 #endif 3330 3331 /* 3332 * IPv4 and IPv6 privileges. 3333 */ 3334 case PRIV_NETINET_IPFW: 3335 case PRIV_NETINET_DIVERT: 3336 case PRIV_NETINET_PF: 3337 case PRIV_NETINET_DUMMYNET: 3338 case PRIV_NETINET_CARP: 3339 case PRIV_NETINET_MROUTE: 3340 case PRIV_NETINET_RAW: 3341 case PRIV_NETINET_ADDRCTRL6: 3342 case PRIV_NETINET_ND6: 3343 case PRIV_NETINET_SCOPE6: 3344 case PRIV_NETINET_ALIFETIME6: 3345 case PRIV_NETINET_IPSEC: 3346 case PRIV_NETINET_BINDANY: 3347 3348 #ifdef notyet 3349 /* 3350 * NCP privileges. 3351 */ 3352 case PRIV_NETNCP: 3353 3354 /* 3355 * SMB privileges. 3356 */ 3357 case PRIV_NETSMB: 3358 #endif 3359 3360 /* 3361 * No default: or deny here. 3362 * In case of no permit fall through to next switch(). 3363 */ 3364 if (cred->cr_prison->pr_flags & PR_VNET) 3365 return (0); 3366 } 3367 #endif /* VIMAGE */ 3368 3369 switch (priv) { 3370 /* 3371 * Allow ktrace privileges for root in jail. 3372 */ 3373 case PRIV_KTRACE: 3374 3375 #if 0 3376 /* 3377 * Allow jailed processes to configure audit identity and 3378 * submit audit records (login, etc). In the future we may 3379 * want to further refine the relationship between audit and 3380 * jail. 3381 */ 3382 case PRIV_AUDIT_GETAUDIT: 3383 case PRIV_AUDIT_SETAUDIT: 3384 case PRIV_AUDIT_SUBMIT: 3385 #endif 3386 3387 /* 3388 * Allow jailed processes to manipulate process UNIX 3389 * credentials in any way they see fit. 3390 */ 3391 case PRIV_CRED_SETUID: 3392 case PRIV_CRED_SETEUID: 3393 case PRIV_CRED_SETGID: 3394 case PRIV_CRED_SETEGID: 3395 case PRIV_CRED_SETGROUPS: 3396 case PRIV_CRED_SETREUID: 3397 case PRIV_CRED_SETREGID: 3398 case PRIV_CRED_SETRESUID: 3399 case PRIV_CRED_SETRESGID: 3400 3401 /* 3402 * Jail implements visibility constraints already, so allow 3403 * jailed root to override uid/gid-based constraints. 3404 */ 3405 case PRIV_SEEOTHERGIDS: 3406 case PRIV_SEEOTHERUIDS: 3407 3408 /* 3409 * Jail implements inter-process debugging limits already, so 3410 * allow jailed root various debugging privileges. 3411 */ 3412 case PRIV_DEBUG_DIFFCRED: 3413 case PRIV_DEBUG_SUGID: 3414 case PRIV_DEBUG_UNPRIV: 3415 3416 /* 3417 * Allow jail to set various resource limits and login 3418 * properties, and for now, exceed process resource limits. 3419 */ 3420 case PRIV_PROC_LIMIT: 3421 case PRIV_PROC_SETLOGIN: 3422 case PRIV_PROC_SETRLIMIT: 3423 3424 /* 3425 * System V and POSIX IPC privileges are granted in jail. 3426 */ 3427 case PRIV_IPC_READ: 3428 case PRIV_IPC_WRITE: 3429 case PRIV_IPC_ADMIN: 3430 case PRIV_IPC_MSGSIZE: 3431 case PRIV_MQ_ADMIN: 3432 3433 /* 3434 * Jail operations within a jail work on child jails. 3435 */ 3436 case PRIV_JAIL_ATTACH: 3437 case PRIV_JAIL_SET: 3438 case PRIV_JAIL_REMOVE: 3439 3440 /* 3441 * Jail implements its own inter-process limits, so allow 3442 * root processes in jail to change scheduling on other 3443 * processes in the same jail. Likewise for signalling. 3444 */ 3445 case PRIV_SCHED_DIFFCRED: 3446 case PRIV_SCHED_CPUSET: 3447 case PRIV_SIGNAL_DIFFCRED: 3448 case PRIV_SIGNAL_SUGID: 3449 3450 /* 3451 * Allow jailed processes to write to sysctls marked as jail 3452 * writable. 3453 */ 3454 case PRIV_SYSCTL_WRITEJAIL: 3455 3456 /* 3457 * Allow root in jail to manage a variety of quota 3458 * properties. These should likely be conditional on a 3459 * configuration option. 3460 */ 3461 case PRIV_VFS_GETQUOTA: 3462 case PRIV_VFS_SETQUOTA: 3463 3464 /* 3465 * Since Jail relies on chroot() to implement file system 3466 * protections, grant many VFS privileges to root in jail. 3467 * Be careful to exclude mount-related and NFS-related 3468 * privileges. 3469 */ 3470 case PRIV_VFS_READ: 3471 case PRIV_VFS_WRITE: 3472 case PRIV_VFS_ADMIN: 3473 case PRIV_VFS_EXEC: 3474 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3475 case PRIV_VFS_CHFLAGS_DEV: 3476 case PRIV_VFS_CHOWN: 3477 case PRIV_VFS_CHROOT: 3478 case PRIV_VFS_RETAINSUGID: 3479 case PRIV_VFS_FCHROOT: 3480 case PRIV_VFS_LINK: 3481 case PRIV_VFS_SETGID: 3482 case PRIV_VFS_STAT: 3483 case PRIV_VFS_STICKYFILE: 3484 3485 /* 3486 * As in the non-jail case, non-root users are expected to be 3487 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3488 * exists in the jail and they have permission to access it). 3489 */ 3490 case PRIV_KMEM_READ: 3491 return (0); 3492 3493 /* 3494 * Depending on the global setting, allow privilege of 3495 * setting system flags. 3496 */ 3497 case PRIV_VFS_SYSFLAGS: 3498 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3499 return (0); 3500 else 3501 return (EPERM); 3502 3503 /* 3504 * Depending on the global setting, allow privilege of 3505 * mounting/unmounting file systems. 3506 */ 3507 case PRIV_VFS_MOUNT: 3508 case PRIV_VFS_UNMOUNT: 3509 case PRIV_VFS_MOUNT_NONUSER: 3510 case PRIV_VFS_MOUNT_OWNER: 3511 pr = cred->cr_prison; 3512 prison_lock(pr); 3513 if (pr->pr_allow & PR_ALLOW_MOUNT && pr->pr_enforce_statfs < 2) 3514 error = 0; 3515 else 3516 error = EPERM; 3517 prison_unlock(pr); 3518 return (error); 3519 3520 /* 3521 * Jails should hold no disposition on the PRIV_VFS_READ_DIR 3522 * policy. priv_check_cred will not specifically allow it, and 3523 * we may want a MAC policy to allow it. 3524 */ 3525 case PRIV_VFS_READ_DIR: 3526 return (0); 3527 3528 /* 3529 * Conditionnaly allow locking (unlocking) physical pages 3530 * in memory. 3531 */ 3532 case PRIV_VM_MLOCK: 3533 case PRIV_VM_MUNLOCK: 3534 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK) 3535 return (0); 3536 else 3537 return (EPERM); 3538 3539 /* 3540 * Conditionally allow jailed root to bind reserved ports. 3541 */ 3542 case PRIV_NETINET_RESERVEDPORT: 3543 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS) 3544 return (0); 3545 else 3546 return (EPERM); 3547 3548 /* 3549 * Allow jailed root to reuse in-use ports. 3550 */ 3551 case PRIV_NETINET_REUSEPORT: 3552 return (0); 3553 3554 /* 3555 * Allow jailed root to set certain IPv4/6 (option) headers. 3556 */ 3557 case PRIV_NETINET_SETHDROPTS: 3558 return (0); 3559 3560 /* 3561 * Conditionally allow creating raw sockets in jail. 3562 */ 3563 case PRIV_NETINET_RAW: 3564 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3565 return (0); 3566 else 3567 return (EPERM); 3568 3569 /* 3570 * Since jail implements its own visibility limits on netstat 3571 * sysctls, allow getcred. This allows identd to work in 3572 * jail. 3573 */ 3574 case PRIV_NETINET_GETCRED: 3575 return (0); 3576 3577 /* 3578 * Allow jailed root to set loginclass. 3579 */ 3580 case PRIV_PROC_SETLOGINCLASS: 3581 return (0); 3582 3583 /* 3584 * Do not allow a process inside a jail to read the kernel 3585 * message buffer unless explicitly permitted. 3586 */ 3587 case PRIV_MSGBUF: 3588 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF) 3589 return (0); 3590 return (EPERM); 3591 3592 default: 3593 /* 3594 * In all remaining cases, deny the privilege request. This 3595 * includes almost all network privileges, many system 3596 * configuration privileges. 3597 */ 3598 return (EPERM); 3599 } 3600 } 3601 3602 /* 3603 * Return the part of pr2's name that is relative to pr1, or the whole name 3604 * if it does not directly follow. 3605 */ 3606 3607 char * 3608 prison_name(struct prison *pr1, struct prison *pr2) 3609 { 3610 char *name; 3611 3612 /* Jails see themselves as "0" (if they see themselves at all). */ 3613 if (pr1 == pr2) 3614 return "0"; 3615 name = pr2->pr_name; 3616 if (prison_ischild(pr1, pr2)) { 3617 /* 3618 * pr1 isn't locked (and allprison_lock may not be either) 3619 * so its length can't be counted on. But the number of dots 3620 * can be counted on - and counted. 3621 */ 3622 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3623 name = strchr(name, '.') + 1; 3624 } 3625 return (name); 3626 } 3627 3628 /* 3629 * Return the part of pr2's path that is relative to pr1, or the whole path 3630 * if it does not directly follow. 3631 */ 3632 static char * 3633 prison_path(struct prison *pr1, struct prison *pr2) 3634 { 3635 char *path1, *path2; 3636 int len1; 3637 3638 path1 = pr1->pr_path; 3639 path2 = pr2->pr_path; 3640 if (!strcmp(path1, "/")) 3641 return (path2); 3642 len1 = strlen(path1); 3643 if (strncmp(path1, path2, len1)) 3644 return (path2); 3645 if (path2[len1] == '\0') 3646 return "/"; 3647 if (path2[len1] == '/') 3648 return (path2 + len1); 3649 return (path2); 3650 } 3651 3652 /* 3653 * Jail-related sysctls. 3654 */ 3655 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 3656 "Jails"); 3657 3658 static int 3659 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 3660 { 3661 struct xprison *xp; 3662 struct prison *pr, *cpr; 3663 #ifdef INET 3664 struct in_addr *ip4 = NULL; 3665 int ip4s = 0; 3666 #endif 3667 #ifdef INET6 3668 struct in6_addr *ip6 = NULL; 3669 int ip6s = 0; 3670 #endif 3671 int descend, error; 3672 3673 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 3674 pr = req->td->td_ucred->cr_prison; 3675 error = 0; 3676 sx_slock(&allprison_lock); 3677 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 3678 #if defined(INET) || defined(INET6) 3679 again: 3680 #endif 3681 mtx_lock(&cpr->pr_mtx); 3682 #ifdef INET 3683 if (cpr->pr_ip4s > 0) { 3684 if (ip4s < cpr->pr_ip4s) { 3685 ip4s = cpr->pr_ip4s; 3686 mtx_unlock(&cpr->pr_mtx); 3687 ip4 = realloc(ip4, ip4s * 3688 sizeof(struct in_addr), M_TEMP, M_WAITOK); 3689 goto again; 3690 } 3691 bcopy(cpr->pr_ip4, ip4, 3692 cpr->pr_ip4s * sizeof(struct in_addr)); 3693 } 3694 #endif 3695 #ifdef INET6 3696 if (cpr->pr_ip6s > 0) { 3697 if (ip6s < cpr->pr_ip6s) { 3698 ip6s = cpr->pr_ip6s; 3699 mtx_unlock(&cpr->pr_mtx); 3700 ip6 = realloc(ip6, ip6s * 3701 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 3702 goto again; 3703 } 3704 bcopy(cpr->pr_ip6, ip6, 3705 cpr->pr_ip6s * sizeof(struct in6_addr)); 3706 } 3707 #endif 3708 if (!prison_isvalid(cpr)) { 3709 mtx_unlock(&cpr->pr_mtx); 3710 continue; 3711 } 3712 bzero(xp, sizeof(*xp)); 3713 xp->pr_version = XPRISON_VERSION; 3714 xp->pr_id = cpr->pr_id; 3715 xp->pr_state = prison_isalive(cpr) 3716 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 3717 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 3718 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 3719 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 3720 #ifdef INET 3721 xp->pr_ip4s = cpr->pr_ip4s; 3722 #endif 3723 #ifdef INET6 3724 xp->pr_ip6s = cpr->pr_ip6s; 3725 #endif 3726 mtx_unlock(&cpr->pr_mtx); 3727 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 3728 if (error) 3729 break; 3730 #ifdef INET 3731 if (xp->pr_ip4s > 0) { 3732 error = SYSCTL_OUT(req, ip4, 3733 xp->pr_ip4s * sizeof(struct in_addr)); 3734 if (error) 3735 break; 3736 } 3737 #endif 3738 #ifdef INET6 3739 if (xp->pr_ip6s > 0) { 3740 error = SYSCTL_OUT(req, ip6, 3741 xp->pr_ip6s * sizeof(struct in6_addr)); 3742 if (error) 3743 break; 3744 } 3745 #endif 3746 } 3747 sx_sunlock(&allprison_lock); 3748 free(xp, M_TEMP); 3749 #ifdef INET 3750 free(ip4, M_TEMP); 3751 #endif 3752 #ifdef INET6 3753 free(ip6, M_TEMP); 3754 #endif 3755 return (error); 3756 } 3757 3758 SYSCTL_OID(_security_jail, OID_AUTO, list, 3759 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3760 sysctl_jail_list, "S", "List of active jails"); 3761 3762 static int 3763 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 3764 { 3765 int error, injail; 3766 3767 injail = jailed(req->td->td_ucred); 3768 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 3769 3770 return (error); 3771 } 3772 3773 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 3774 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3775 sysctl_jail_jailed, "I", "Process in jail?"); 3776 3777 static int 3778 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 3779 { 3780 int error, havevnet; 3781 #ifdef VIMAGE 3782 struct ucred *cred = req->td->td_ucred; 3783 3784 havevnet = jailed(cred) && prison_owns_vnet(cred); 3785 #else 3786 havevnet = 0; 3787 #endif 3788 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 3789 3790 return (error); 3791 } 3792 3793 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 3794 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3795 sysctl_jail_vnet, "I", "Jail owns vnet?"); 3796 3797 #if defined(INET) || defined(INET6) 3798 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 3799 &jail_max_af_ips, 0, 3800 "Number of IP addresses a jail may have at most per address family (deprecated)"); 3801 #endif 3802 3803 /* 3804 * Default parameters for jail(2) compatibility. For historical reasons, 3805 * the sysctl names have varying similarity to the parameter names. Prisons 3806 * just see their own parameters, and can't change them. 3807 */ 3808 static int 3809 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 3810 { 3811 int error, i; 3812 3813 /* Get the current flag value, and convert it to a boolean. */ 3814 if (req->td->td_ucred->cr_prison == &prison0) { 3815 mtx_lock(&prison0.pr_mtx); 3816 i = (jail_default_allow & arg2) != 0; 3817 mtx_unlock(&prison0.pr_mtx); 3818 } else 3819 i = prison_allow(req->td->td_ucred, arg2); 3820 3821 if (arg1 != NULL) 3822 i = !i; 3823 error = sysctl_handle_int(oidp, &i, 0, req); 3824 if (error || !req->newptr) 3825 return (error); 3826 i = i ? arg2 : 0; 3827 if (arg1 != NULL) 3828 i ^= arg2; 3829 /* 3830 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 3831 * for writing. 3832 */ 3833 mtx_lock(&prison0.pr_mtx); 3834 jail_default_allow = (jail_default_allow & ~arg2) | i; 3835 mtx_unlock(&prison0.pr_mtx); 3836 return (0); 3837 } 3838 3839 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 3840 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3841 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 3842 "Processes in jail can set their hostnames (deprecated)"); 3843 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 3844 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3845 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 3846 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 3847 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 3848 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3849 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 3850 "Processes in jail can use System V IPC primitives (deprecated)"); 3851 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 3852 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3853 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 3854 "Prison root can create raw sockets (deprecated)"); 3855 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 3856 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3857 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 3858 "Processes in jail can alter system file flags (deprecated)"); 3859 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 3860 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3861 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 3862 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 3863 3864 static int 3865 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 3866 { 3867 struct prison *pr; 3868 int level, error; 3869 3870 pr = req->td->td_ucred->cr_prison; 3871 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 3872 error = sysctl_handle_int(oidp, &level, 0, req); 3873 if (error || !req->newptr) 3874 return (error); 3875 *(int *)arg1 = level; 3876 return (0); 3877 } 3878 3879 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 3880 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3881 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 3882 sysctl_jail_default_level, "I", 3883 "Processes in jail cannot see all mounted file systems (deprecated)"); 3884 3885 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 3886 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 3887 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 3888 sysctl_jail_default_level, "I", 3889 "Ruleset for the devfs filesystem in jail (deprecated)"); 3890 3891 /* 3892 * Nodes to describe jail parameters. Maximum length of string parameters 3893 * is returned in the string itself, and the other parameters exist merely 3894 * to make themselves and their types known. 3895 */ 3896 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 3897 "Jail parameters"); 3898 3899 int 3900 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 3901 { 3902 int i; 3903 long l; 3904 size_t s; 3905 char numbuf[12]; 3906 3907 switch (oidp->oid_kind & CTLTYPE) 3908 { 3909 case CTLTYPE_LONG: 3910 case CTLTYPE_ULONG: 3911 l = 0; 3912 #ifdef SCTL_MASK32 3913 if (!(req->flags & SCTL_MASK32)) 3914 #endif 3915 return (SYSCTL_OUT(req, &l, sizeof(l))); 3916 case CTLTYPE_INT: 3917 case CTLTYPE_UINT: 3918 i = 0; 3919 return (SYSCTL_OUT(req, &i, sizeof(i))); 3920 case CTLTYPE_STRING: 3921 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 3922 return 3923 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 3924 case CTLTYPE_STRUCT: 3925 s = (size_t)arg2; 3926 return (SYSCTL_OUT(req, &s, sizeof(s))); 3927 } 3928 return (0); 3929 } 3930 3931 /* 3932 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 3933 * jail creation time but cannot be changed in an existing jail. 3934 */ 3935 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 3936 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 3937 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 3938 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 3939 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 3940 "I", "Jail secure level"); 3941 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 3942 "Jail value for kern.osreldate and uname -K"); 3943 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 3944 "Jail value for kern.osrelease and uname -r"); 3945 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 3946 "I", "Jail cannot see all mounted file systems"); 3947 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 3948 "I", "Ruleset for in-jail devfs mounts"); 3949 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 3950 "B", "Jail persistence"); 3951 #ifdef VIMAGE 3952 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 3953 "E,jailsys", "Virtual network stack"); 3954 #endif 3955 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 3956 "B", "Jail is in the process of shutting down"); 3957 3958 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 3959 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 3960 "I", "Current number of child jails"); 3961 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 3962 "I", "Maximum number of child jails"); 3963 3964 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 3965 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 3966 "Jail hostname"); 3967 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 3968 "Jail NIS domainname"); 3969 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 3970 "Jail host UUID"); 3971 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 3972 "LU", "Jail host ID"); 3973 3974 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 3975 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 3976 3977 #ifdef INET 3978 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 3979 "Jail IPv4 address virtualization"); 3980 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 3981 "S,in_addr,a", "Jail IPv4 addresses"); 3982 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3983 "B", "Do (not) use IPv4 source address selection rather than the " 3984 "primary jail IPv4 address."); 3985 #endif 3986 #ifdef INET6 3987 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 3988 "Jail IPv6 address virtualization"); 3989 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 3990 "S,in6_addr,a", "Jail IPv6 addresses"); 3991 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3992 "B", "Do (not) use IPv6 source address selection rather than the " 3993 "primary jail IPv6 address."); 3994 #endif 3995 3996 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 3997 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 3998 "B", "Jail may set hostname"); 3999 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4000 "B", "Jail may use SYSV IPC"); 4001 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4002 "B", "Jail may create raw sockets"); 4003 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4004 "B", "Jail may alter system file flags"); 4005 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4006 "B", "Jail may set file quotas"); 4007 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4008 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4009 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW, 4010 "B", "Jail may lock (unlock) physical pages in memory"); 4011 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW, 4012 "B", "Jail may bind sockets to reserved ports"); 4013 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW, 4014 "B", "Jail may read the kernel message buffer"); 4015 SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW, 4016 "B", "Unprivileged processes may use process debugging facilities"); 4017 SYSCTL_JAIL_PARAM(_allow, suser, CTLTYPE_INT | CTLFLAG_RW, 4018 "B", "Processes in jail with uid 0 have privilege"); 4019 4020 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4021 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4022 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4023 4024 /* 4025 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return 4026 * its associated bit in the pr_allow bitmask, or zero if the parameter was 4027 * not created. 4028 */ 4029 unsigned 4030 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr, 4031 const char *descr) 4032 { 4033 struct bool_flags *bf; 4034 struct sysctl_oid *parent; 4035 char *allow_name, *allow_noname, *allowed; 4036 #ifndef NO_SYSCTL_DESCR 4037 char *descr_deprecated; 4038 #endif 4039 u_int allow_flag; 4040 4041 if (prefix 4042 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name) 4043 < 0 || 4044 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name) 4045 < 0 4046 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 || 4047 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) { 4048 free(allow_name, M_PRISON); 4049 return 0; 4050 } 4051 4052 /* 4053 * See if this parameter has already beed added, i.e. a module was 4054 * previously loaded/unloaded. 4055 */ 4056 mtx_lock(&prison0.pr_mtx); 4057 for (bf = pr_flag_allow; 4058 bf < pr_flag_allow + nitems(pr_flag_allow) && 4059 atomic_load_int(&bf->flag) != 0; 4060 bf++) { 4061 if (strcmp(bf->name, allow_name) == 0) { 4062 allow_flag = bf->flag; 4063 goto no_add; 4064 } 4065 } 4066 4067 /* 4068 * Find a free bit in pr_allow_all, failing if there are none 4069 * (which shouldn't happen as long as we keep track of how many 4070 * potential dynamic flags exist). 4071 */ 4072 for (allow_flag = 1;; allow_flag <<= 1) { 4073 if (allow_flag == 0) 4074 goto no_add; 4075 if ((pr_allow_all & allow_flag) == 0) 4076 break; 4077 } 4078 4079 /* Note the parameter in the next open slot in pr_flag_allow. */ 4080 for (bf = pr_flag_allow; ; bf++) { 4081 if (bf == pr_flag_allow + nitems(pr_flag_allow)) { 4082 /* This should never happen, but is not fatal. */ 4083 allow_flag = 0; 4084 goto no_add; 4085 } 4086 if (atomic_load_int(&bf->flag) == 0) 4087 break; 4088 } 4089 bf->name = allow_name; 4090 bf->noname = allow_noname; 4091 pr_allow_all |= allow_flag; 4092 /* 4093 * prison0 always has permission for the new parameter. 4094 * Other jails must have it granted to them. 4095 */ 4096 prison0.pr_allow |= allow_flag; 4097 /* The flag indicates a valid entry, so make sure it is set last. */ 4098 atomic_store_rel_int(&bf->flag, allow_flag); 4099 mtx_unlock(&prison0.pr_mtx); 4100 4101 /* 4102 * Create sysctls for the paramter, and the back-compat global 4103 * permission. 4104 */ 4105 parent = prefix 4106 ? SYSCTL_ADD_NODE(NULL, 4107 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow), 4108 OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr) 4109 : &sysctl___security_jail_param_allow; 4110 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO, 4111 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4112 NULL, 0, sysctl_jail_param, "B", descr); 4113 if ((prefix 4114 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name) 4115 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) { 4116 #ifndef NO_SYSCTL_DESCR 4117 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)", 4118 descr); 4119 #endif 4120 (void)SYSCTL_ADD_PROC(NULL, 4121 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed, 4122 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag, 4123 sysctl_jail_default_allow, "I", descr_deprecated); 4124 #ifndef NO_SYSCTL_DESCR 4125 free(descr_deprecated, M_TEMP); 4126 #endif 4127 free(allowed, M_TEMP); 4128 } 4129 return allow_flag; 4130 4131 no_add: 4132 mtx_unlock(&prison0.pr_mtx); 4133 free(allow_name, M_PRISON); 4134 free(allow_noname, M_PRISON); 4135 return allow_flag; 4136 } 4137 4138 /* 4139 * The VFS system will register jail-aware filesystems here. They each get 4140 * a parameter allow.mount.xxxfs and a flag to check when a jailed user 4141 * attempts to mount. 4142 */ 4143 void 4144 prison_add_vfs(struct vfsconf *vfsp) 4145 { 4146 #ifdef NO_SYSCTL_DESCR 4147 4148 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 4149 NULL, NULL); 4150 #else 4151 char *descr; 4152 4153 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system", 4154 vfsp->vfc_name); 4155 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 4156 NULL, descr); 4157 free(descr, M_TEMP); 4158 #endif 4159 } 4160 4161 #ifdef RACCT 4162 void 4163 prison_racct_foreach(void (*callback)(struct racct *racct, 4164 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 4165 void *arg2, void *arg3) 4166 { 4167 struct prison_racct *prr; 4168 4169 ASSERT_RACCT_ENABLED(); 4170 4171 sx_slock(&allprison_lock); 4172 if (pre != NULL) 4173 (pre)(); 4174 LIST_FOREACH(prr, &allprison_racct, prr_next) 4175 (callback)(prr->prr_racct, arg2, arg3); 4176 if (post != NULL) 4177 (post)(); 4178 sx_sunlock(&allprison_lock); 4179 } 4180 4181 static struct prison_racct * 4182 prison_racct_find_locked(const char *name) 4183 { 4184 struct prison_racct *prr; 4185 4186 ASSERT_RACCT_ENABLED(); 4187 sx_assert(&allprison_lock, SA_XLOCKED); 4188 4189 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4190 return (NULL); 4191 4192 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4193 if (strcmp(name, prr->prr_name) != 0) 4194 continue; 4195 4196 /* Found prison_racct with a matching name? */ 4197 prison_racct_hold(prr); 4198 return (prr); 4199 } 4200 4201 /* Add new prison_racct. */ 4202 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4203 racct_create(&prr->prr_racct); 4204 4205 strcpy(prr->prr_name, name); 4206 refcount_init(&prr->prr_refcount, 1); 4207 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4208 4209 return (prr); 4210 } 4211 4212 struct prison_racct * 4213 prison_racct_find(const char *name) 4214 { 4215 struct prison_racct *prr; 4216 4217 ASSERT_RACCT_ENABLED(); 4218 4219 sx_xlock(&allprison_lock); 4220 prr = prison_racct_find_locked(name); 4221 sx_xunlock(&allprison_lock); 4222 return (prr); 4223 } 4224 4225 void 4226 prison_racct_hold(struct prison_racct *prr) 4227 { 4228 4229 ASSERT_RACCT_ENABLED(); 4230 4231 refcount_acquire(&prr->prr_refcount); 4232 } 4233 4234 static void 4235 prison_racct_free_locked(struct prison_racct *prr) 4236 { 4237 4238 ASSERT_RACCT_ENABLED(); 4239 sx_assert(&allprison_lock, SA_XLOCKED); 4240 4241 if (refcount_release(&prr->prr_refcount)) { 4242 racct_destroy(&prr->prr_racct); 4243 LIST_REMOVE(prr, prr_next); 4244 free(prr, M_PRISON_RACCT); 4245 } 4246 } 4247 4248 void 4249 prison_racct_free(struct prison_racct *prr) 4250 { 4251 4252 ASSERT_RACCT_ENABLED(); 4253 sx_assert(&allprison_lock, SA_UNLOCKED); 4254 4255 if (refcount_release_if_not_last(&prr->prr_refcount)) 4256 return; 4257 4258 sx_xlock(&allprison_lock); 4259 prison_racct_free_locked(prr); 4260 sx_xunlock(&allprison_lock); 4261 } 4262 4263 static void 4264 prison_racct_attach(struct prison *pr) 4265 { 4266 struct prison_racct *prr; 4267 4268 ASSERT_RACCT_ENABLED(); 4269 sx_assert(&allprison_lock, SA_XLOCKED); 4270 4271 prr = prison_racct_find_locked(pr->pr_name); 4272 KASSERT(prr != NULL, ("cannot find prison_racct")); 4273 4274 pr->pr_prison_racct = prr; 4275 } 4276 4277 /* 4278 * Handle jail renaming. From the racct point of view, renaming means 4279 * moving from one prison_racct to another. 4280 */ 4281 static void 4282 prison_racct_modify(struct prison *pr) 4283 { 4284 #ifdef RCTL 4285 struct proc *p; 4286 struct ucred *cred; 4287 #endif 4288 struct prison_racct *oldprr; 4289 4290 ASSERT_RACCT_ENABLED(); 4291 4292 sx_slock(&allproc_lock); 4293 sx_xlock(&allprison_lock); 4294 4295 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4296 sx_xunlock(&allprison_lock); 4297 sx_sunlock(&allproc_lock); 4298 return; 4299 } 4300 4301 oldprr = pr->pr_prison_racct; 4302 pr->pr_prison_racct = NULL; 4303 4304 prison_racct_attach(pr); 4305 4306 /* 4307 * Move resource utilisation records. 4308 */ 4309 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4310 4311 #ifdef RCTL 4312 /* 4313 * Force rctl to reattach rules to processes. 4314 */ 4315 FOREACH_PROC_IN_SYSTEM(p) { 4316 PROC_LOCK(p); 4317 cred = crhold(p->p_ucred); 4318 PROC_UNLOCK(p); 4319 rctl_proc_ucred_changed(p, cred); 4320 crfree(cred); 4321 } 4322 #endif 4323 4324 sx_sunlock(&allproc_lock); 4325 prison_racct_free_locked(oldprr); 4326 sx_xunlock(&allprison_lock); 4327 } 4328 4329 static void 4330 prison_racct_detach(struct prison *pr) 4331 { 4332 4333 ASSERT_RACCT_ENABLED(); 4334 sx_assert(&allprison_lock, SA_UNLOCKED); 4335 4336 if (pr->pr_prison_racct == NULL) 4337 return; 4338 prison_racct_free(pr->pr_prison_racct); 4339 pr->pr_prison_racct = NULL; 4340 } 4341 #endif /* RACCT */ 4342 4343 #ifdef DDB 4344 4345 static void 4346 db_show_prison(struct prison *pr) 4347 { 4348 struct bool_flags *bf; 4349 struct jailsys_flags *jsf; 4350 #if defined(INET) || defined(INET6) 4351 int ii; 4352 #endif 4353 unsigned f; 4354 #ifdef INET 4355 char ip4buf[INET_ADDRSTRLEN]; 4356 #endif 4357 #ifdef INET6 4358 char ip6buf[INET6_ADDRSTRLEN]; 4359 #endif 4360 4361 db_printf("prison %p:\n", pr); 4362 db_printf(" jid = %d\n", pr->pr_id); 4363 db_printf(" name = %s\n", pr->pr_name); 4364 db_printf(" parent = %p\n", pr->pr_parent); 4365 db_printf(" ref = %d\n", pr->pr_ref); 4366 db_printf(" uref = %d\n", pr->pr_uref); 4367 db_printf(" path = %s\n", pr->pr_path); 4368 db_printf(" cpuset = %d\n", pr->pr_cpuset 4369 ? pr->pr_cpuset->cs_id : -1); 4370 #ifdef VIMAGE 4371 db_printf(" vnet = %p\n", pr->pr_vnet); 4372 #endif 4373 db_printf(" root = %p\n", pr->pr_root); 4374 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4375 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4376 db_printf(" children.max = %d\n", pr->pr_childmax); 4377 db_printf(" children.cur = %d\n", pr->pr_childcount); 4378 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4379 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4380 db_printf(" flags = 0x%x", pr->pr_flags); 4381 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++) 4382 if (pr->pr_flags & bf->flag) 4383 db_printf(" %s", bf->name); 4384 for (jsf = pr_flag_jailsys; 4385 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 4386 jsf++) { 4387 f = pr->pr_flags & (jsf->disable | jsf->new); 4388 db_printf(" %-16s= %s\n", jsf->name, 4389 (f != 0 && f == jsf->disable) ? "disable" 4390 : (f == jsf->new) ? "new" 4391 : "inherit"); 4392 } 4393 db_printf(" allow = 0x%x", pr->pr_allow); 4394 for (bf = pr_flag_allow; 4395 bf < pr_flag_allow + nitems(pr_flag_allow) && 4396 atomic_load_int(&bf->flag) != 0; 4397 bf++) 4398 if (pr->pr_allow & bf->flag) 4399 db_printf(" %s", bf->name); 4400 db_printf("\n"); 4401 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4402 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4403 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4404 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4405 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4406 #ifdef INET 4407 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4408 for (ii = 0; ii < pr->pr_ip4s; ii++) 4409 db_printf(" %s %s\n", 4410 ii == 0 ? "ip4.addr =" : " ", 4411 inet_ntoa_r(pr->pr_ip4[ii], ip4buf)); 4412 #endif 4413 #ifdef INET6 4414 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4415 for (ii = 0; ii < pr->pr_ip6s; ii++) 4416 db_printf(" %s %s\n", 4417 ii == 0 ? "ip6.addr =" : " ", 4418 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4419 #endif 4420 } 4421 4422 DB_SHOW_COMMAND(prison, db_show_prison_command) 4423 { 4424 struct prison *pr; 4425 4426 if (!have_addr) { 4427 /* 4428 * Show all prisons in the list, and prison0 which is not 4429 * listed. 4430 */ 4431 db_show_prison(&prison0); 4432 if (!db_pager_quit) { 4433 TAILQ_FOREACH(pr, &allprison, pr_list) { 4434 db_show_prison(pr); 4435 if (db_pager_quit) 4436 break; 4437 } 4438 } 4439 return; 4440 } 4441 4442 if (addr == 0) 4443 pr = &prison0; 4444 else { 4445 /* Look for a prison with the ID and with references. */ 4446 TAILQ_FOREACH(pr, &allprison, pr_list) 4447 if (pr->pr_id == addr && pr->pr_ref > 0) 4448 break; 4449 if (pr == NULL) 4450 /* Look again, without requiring a reference. */ 4451 TAILQ_FOREACH(pr, &allprison, pr_list) 4452 if (pr->pr_id == addr) 4453 break; 4454 if (pr == NULL) 4455 /* Assume address points to a valid prison. */ 4456 pr = (struct prison *)addr; 4457 } 4458 db_show_prison(pr); 4459 } 4460 4461 #endif /* DDB */ 4462