1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1999 Poul-Henning Kamp. 5 * Copyright (c) 2008 Bjoern A. Zeeb. 6 * Copyright (c) 2009 James Gritton. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 #include "opt_ddb.h" 33 #include "opt_inet.h" 34 #include "opt_inet6.h" 35 #include "opt_nfs.h" 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/kernel.h> 40 #include <sys/systm.h> 41 #include <sys/errno.h> 42 #include <sys/sysproto.h> 43 #include <sys/malloc.h> 44 #include <sys/osd.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/epoch.h> 48 #include <sys/taskqueue.h> 49 #include <sys/fcntl.h> 50 #include <sys/jail.h> 51 #include <sys/linker.h> 52 #include <sys/lock.h> 53 #include <sys/mman.h> 54 #include <sys/mutex.h> 55 #include <sys/racct.h> 56 #include <sys/rctl.h> 57 #include <sys/refcount.h> 58 #include <sys/sx.h> 59 #include <sys/sysent.h> 60 #include <sys/namei.h> 61 #include <sys/mount.h> 62 #include <sys/queue.h> 63 #include <sys/socket.h> 64 #include <sys/syscallsubr.h> 65 #include <sys/sysctl.h> 66 #include <sys/uuid.h> 67 #include <sys/vnode.h> 68 69 #include <net/if.h> 70 #include <net/vnet.h> 71 72 #include <netinet/in.h> 73 74 #ifdef DDB 75 #include <ddb/ddb.h> 76 #endif /* DDB */ 77 78 #include <security/mac/mac_framework.h> 79 80 #define PRISON0_HOSTUUID_MODULE "hostuuid" 81 82 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 83 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 84 85 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 86 #ifdef INET 87 #ifdef INET6 88 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 89 #else 90 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 91 #endif 92 #else /* !INET */ 93 #ifdef INET6 94 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 95 #else 96 #define _PR_IP_SADDRSEL 0 97 #endif 98 #endif 99 100 /* prison0 describes what is "real" about the system. */ 101 struct prison prison0 = { 102 .pr_id = 0, 103 .pr_name = "0", 104 .pr_ref = 1, 105 .pr_uref = 1, 106 .pr_path = "/", 107 .pr_securelevel = -1, 108 .pr_devfs_rsnum = 0, 109 .pr_state = PRISON_STATE_ALIVE, 110 .pr_childmax = JAIL_MAX, 111 .pr_hostuuid = DEFAULT_HOSTUUID, 112 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 113 #ifdef VIMAGE 114 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 115 #else 116 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 117 #endif 118 .pr_allow = PR_ALLOW_ALL_STATIC, 119 }; 120 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 121 122 struct bool_flags { 123 const char *name; 124 const char *noname; 125 volatile u_int flag; 126 }; 127 struct jailsys_flags { 128 const char *name; 129 unsigned disable; 130 unsigned new; 131 }; 132 133 /* 134 * Handle jail teardown in a dedicated thread to avoid deadlocks from 135 * vnet_destroy(). 136 */ 137 TASKQUEUE_DEFINE_THREAD(jail_remove); 138 139 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 140 struct sx allprison_lock; 141 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 142 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 143 LIST_HEAD(, prison_racct) allprison_racct; 144 int lastprid = 0; 145 int lastdeadid = 0; 146 147 static int get_next_prid(struct prison **insprp); 148 static int get_next_deadid(struct prison **insprp); 149 static int do_jail_attach(struct thread *td, struct prison *pr, int drflags); 150 static void prison_complete(void *context, int pending); 151 static void prison_deref(struct prison *pr, int flags); 152 static void prison_deref_kill(struct prison *pr, struct prisonlist *freeprison); 153 static int prison_lock_xlock(struct prison *pr, int flags); 154 static void prison_cleanup(struct prison *pr); 155 static void prison_free_not_last(struct prison *pr); 156 static void prison_proc_free_not_last(struct prison *pr); 157 static void prison_proc_relink(struct prison *opr, struct prison *npr, 158 struct proc *p); 159 static void prison_set_allow_locked(struct prison *pr, unsigned flag, 160 int enable); 161 static char *prison_path(struct prison *pr1, struct prison *pr2); 162 #ifdef RACCT 163 static void prison_racct_attach(struct prison *pr); 164 static void prison_racct_modify(struct prison *pr); 165 static void prison_racct_detach(struct prison *pr); 166 #endif 167 168 /* Flags for prison_deref */ 169 #define PD_DEREF 0x01 /* Decrement pr_ref */ 170 #define PD_DEUREF 0x02 /* Decrement pr_uref */ 171 #define PD_KILL 0x04 /* Remove jail, kill processes, etc */ 172 #define PD_LOCKED 0x10 /* pr_mtx is held */ 173 #define PD_LIST_SLOCKED 0x20 /* allprison_lock is held shared */ 174 #define PD_LIST_XLOCKED 0x40 /* allprison_lock is held exclusive */ 175 #define PD_OP_FLAGS 0x07 /* Operation flags */ 176 #define PD_LOCK_FLAGS 0x70 /* Lock status flags */ 177 178 /* 179 * Parameter names corresponding to PR_* flag values. Size values are for kvm 180 * as we cannot figure out the size of a sparse array, or an array without a 181 * terminating entry. 182 */ 183 static struct bool_flags pr_flag_bool[] = { 184 {"persist", "nopersist", PR_PERSIST}, 185 #ifdef INET 186 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL}, 187 #endif 188 #ifdef INET6 189 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL}, 190 #endif 191 }; 192 const size_t pr_flag_bool_size = sizeof(pr_flag_bool); 193 194 static struct jailsys_flags pr_flag_jailsys[] = { 195 {"host", 0, PR_HOST}, 196 #ifdef VIMAGE 197 {"vnet", 0, PR_VNET}, 198 #endif 199 #ifdef INET 200 {"ip4", PR_IP4_USER, PR_IP4_USER}, 201 #endif 202 #ifdef INET6 203 {"ip6", PR_IP6_USER, PR_IP6_USER}, 204 #endif 205 }; 206 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 207 208 /* 209 * Make this array full-size so dynamic parameters can be added. 210 * It is protected by prison0.mtx, but lockless reading is allowed 211 * with an atomic check of the flag values. 212 */ 213 static struct bool_flags pr_flag_allow[NBBY * NBPW] = { 214 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME}, 215 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC}, 216 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS}, 217 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS}, 218 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT}, 219 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS}, 220 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF}, 221 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK}, 222 {"allow.reserved_ports", "allow.noreserved_ports", 223 PR_ALLOW_RESERVED_PORTS}, 224 {"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF}, 225 {"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug", 226 PR_ALLOW_UNPRIV_DEBUG}, 227 {"allow.suser", "allow.nosuser", PR_ALLOW_SUSER}, 228 #ifdef VIMAGE 229 {"allow.nfsd", "allow.nonfsd", PR_ALLOW_NFSD}, 230 #endif 231 {"allow.extattr", "allow.noextattr", PR_ALLOW_EXTATTR}, 232 {"allow.adjtime", "allow.noadjtime", PR_ALLOW_ADJTIME}, 233 {"allow.settime", "allow.nosettime", PR_ALLOW_SETTIME}, 234 }; 235 static unsigned pr_allow_all = PR_ALLOW_ALL_STATIC; 236 const size_t pr_flag_allow_size = sizeof(pr_flag_allow); 237 238 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \ 239 PR_ALLOW_RESERVED_PORTS | \ 240 PR_ALLOW_UNPRIV_DEBUG | \ 241 PR_ALLOW_SUSER) 242 #define JAIL_DEFAULT_ENFORCE_STATFS 2 243 #define JAIL_DEFAULT_DEVFS_RSNUM 0 244 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 245 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 246 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 247 #if defined(INET) || defined(INET6) 248 static unsigned jail_max_af_ips = 255; 249 #endif 250 251 /* 252 * Initialize the parts of prison0 that can't be static-initialized with 253 * constants. This is called from proc0_init() after creating thread0 cpuset. 254 */ 255 void 256 prison0_init(void) 257 { 258 uint8_t *file, *data; 259 size_t size; 260 char buf[sizeof(prison0.pr_hostuuid)]; 261 bool valid; 262 263 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 264 prison0.pr_osreldate = osreldate; 265 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 266 267 /* If we have a preloaded hostuuid, use it. */ 268 file = preload_search_by_type(PRISON0_HOSTUUID_MODULE); 269 if (file != NULL) { 270 data = preload_fetch_addr(file); 271 size = preload_fetch_size(file); 272 if (data != NULL) { 273 /* 274 * The preloaded data may include trailing whitespace, almost 275 * certainly a newline; skip over any whitespace or 276 * non-printable characters to be safe. 277 */ 278 while (size > 0 && data[size - 1] <= 0x20) { 279 size--; 280 } 281 282 valid = false; 283 284 /* 285 * Not NUL-terminated when passed from loader, but 286 * validate_uuid requires that due to using sscanf (as 287 * does the subsequent strlcpy, since it still reads 288 * past the given size to return the true length); 289 * bounce to a temporary buffer to fix. 290 */ 291 if (size >= sizeof(buf)) 292 goto done; 293 294 memcpy(buf, data, size); 295 buf[size] = '\0'; 296 297 if (validate_uuid(buf, size, NULL, 0) != 0) 298 goto done; 299 300 valid = true; 301 (void)strlcpy(prison0.pr_hostuuid, buf, 302 sizeof(prison0.pr_hostuuid)); 303 304 done: 305 if (bootverbose && !valid) { 306 printf("hostuuid: preload data malformed: '%.*s'\n", 307 (int)size, data); 308 } 309 } 310 } 311 if (bootverbose) 312 printf("hostuuid: using %s\n", prison0.pr_hostuuid); 313 } 314 315 /* 316 * struct jail_args { 317 * struct jail *jail; 318 * }; 319 */ 320 int 321 sys_jail(struct thread *td, struct jail_args *uap) 322 { 323 uint32_t version; 324 int error; 325 struct jail j; 326 327 error = copyin(uap->jail, &version, sizeof(uint32_t)); 328 if (error) 329 return (error); 330 331 switch (version) { 332 case 0: 333 { 334 struct jail_v0 j0; 335 336 /* FreeBSD single IPv4 jails. */ 337 bzero(&j, sizeof(struct jail)); 338 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 339 if (error) 340 return (error); 341 j.version = j0.version; 342 j.path = j0.path; 343 j.hostname = j0.hostname; 344 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 345 break; 346 } 347 348 case 1: 349 /* 350 * Version 1 was used by multi-IPv4 jail implementations 351 * that never made it into the official kernel. 352 */ 353 return (EINVAL); 354 355 case 2: /* JAIL_API_VERSION */ 356 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 357 error = copyin(uap->jail, &j, sizeof(struct jail)); 358 if (error) 359 return (error); 360 break; 361 362 default: 363 /* Sci-Fi jails are not supported, sorry. */ 364 return (EINVAL); 365 } 366 return (kern_jail(td, &j)); 367 } 368 369 int 370 kern_jail(struct thread *td, struct jail *j) 371 { 372 struct iovec optiov[2 * (4 + nitems(pr_flag_allow) 373 #ifdef INET 374 + 1 375 #endif 376 #ifdef INET6 377 + 1 378 #endif 379 )]; 380 struct uio opt; 381 char *u_path, *u_hostname, *u_name; 382 struct bool_flags *bf; 383 #ifdef INET 384 uint32_t ip4s; 385 struct in_addr *u_ip4; 386 #endif 387 #ifdef INET6 388 struct in6_addr *u_ip6; 389 #endif 390 size_t tmplen; 391 int error, enforce_statfs; 392 393 bzero(&optiov, sizeof(optiov)); 394 opt.uio_iov = optiov; 395 opt.uio_iovcnt = 0; 396 opt.uio_offset = -1; 397 opt.uio_resid = -1; 398 opt.uio_segflg = UIO_SYSSPACE; 399 opt.uio_rw = UIO_READ; 400 opt.uio_td = td; 401 402 /* Set permissions for top-level jails from sysctls. */ 403 if (!jailed(td->td_ucred)) { 404 for (bf = pr_flag_allow; 405 bf < pr_flag_allow + nitems(pr_flag_allow) && 406 atomic_load_int(&bf->flag) != 0; 407 bf++) { 408 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *, 409 (jail_default_allow & bf->flag) 410 ? bf->name : bf->noname); 411 optiov[opt.uio_iovcnt].iov_len = 412 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 413 opt.uio_iovcnt += 2; 414 } 415 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 416 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 417 opt.uio_iovcnt++; 418 enforce_statfs = jail_default_enforce_statfs; 419 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 420 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 421 opt.uio_iovcnt++; 422 } 423 424 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 425 #ifdef INET 426 ip4s = (j->version == 0) ? 1 : j->ip4s; 427 if (ip4s > jail_max_af_ips) 428 return (EINVAL); 429 tmplen += ip4s * sizeof(struct in_addr); 430 #else 431 if (j->ip4s > 0) 432 return (EINVAL); 433 #endif 434 #ifdef INET6 435 if (j->ip6s > jail_max_af_ips) 436 return (EINVAL); 437 tmplen += j->ip6s * sizeof(struct in6_addr); 438 #else 439 if (j->ip6s > 0) 440 return (EINVAL); 441 #endif 442 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 443 u_hostname = u_path + MAXPATHLEN; 444 u_name = u_hostname + MAXHOSTNAMELEN; 445 #ifdef INET 446 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 447 #endif 448 #ifdef INET6 449 #ifdef INET 450 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 451 #else 452 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 453 #endif 454 #endif 455 optiov[opt.uio_iovcnt].iov_base = "path"; 456 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 457 opt.uio_iovcnt++; 458 optiov[opt.uio_iovcnt].iov_base = u_path; 459 error = copyinstr(j->path, u_path, MAXPATHLEN, 460 &optiov[opt.uio_iovcnt].iov_len); 461 if (error) { 462 free(u_path, M_TEMP); 463 return (error); 464 } 465 opt.uio_iovcnt++; 466 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 467 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 468 opt.uio_iovcnt++; 469 optiov[opt.uio_iovcnt].iov_base = u_hostname; 470 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 471 &optiov[opt.uio_iovcnt].iov_len); 472 if (error) { 473 free(u_path, M_TEMP); 474 return (error); 475 } 476 opt.uio_iovcnt++; 477 if (j->jailname != NULL) { 478 optiov[opt.uio_iovcnt].iov_base = "name"; 479 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 480 opt.uio_iovcnt++; 481 optiov[opt.uio_iovcnt].iov_base = u_name; 482 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 483 &optiov[opt.uio_iovcnt].iov_len); 484 if (error) { 485 free(u_path, M_TEMP); 486 return (error); 487 } 488 opt.uio_iovcnt++; 489 } 490 #ifdef INET 491 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 492 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 493 opt.uio_iovcnt++; 494 optiov[opt.uio_iovcnt].iov_base = u_ip4; 495 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 496 if (j->version == 0) 497 u_ip4->s_addr = j->ip4s; 498 else { 499 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 500 if (error) { 501 free(u_path, M_TEMP); 502 return (error); 503 } 504 } 505 opt.uio_iovcnt++; 506 #endif 507 #ifdef INET6 508 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 509 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 510 opt.uio_iovcnt++; 511 optiov[opt.uio_iovcnt].iov_base = u_ip6; 512 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 513 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 514 if (error) { 515 free(u_path, M_TEMP); 516 return (error); 517 } 518 opt.uio_iovcnt++; 519 #endif 520 KASSERT(opt.uio_iovcnt <= nitems(optiov), 521 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 522 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 523 free(u_path, M_TEMP); 524 return (error); 525 } 526 527 /* 528 * struct jail_set_args { 529 * struct iovec *iovp; 530 * unsigned int iovcnt; 531 * int flags; 532 * }; 533 */ 534 int 535 sys_jail_set(struct thread *td, struct jail_set_args *uap) 536 { 537 struct uio *auio; 538 int error; 539 540 /* Check that we have an even number of iovecs. */ 541 if (uap->iovcnt & 1) 542 return (EINVAL); 543 544 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 545 if (error) 546 return (error); 547 error = kern_jail_set(td, auio, uap->flags); 548 freeuio(auio); 549 return (error); 550 } 551 552 #if defined(INET) || defined(INET6) 553 typedef int prison_addr_cmp_t(const void *, const void *); 554 typedef bool prison_addr_valid_t(const void *); 555 static const struct pr_family { 556 size_t size; 557 prison_addr_cmp_t *cmp; 558 prison_addr_valid_t *valid; 559 int ip_flag; 560 } pr_families[PR_FAMILY_MAX] = { 561 #ifdef INET 562 [PR_INET] = { 563 .size = sizeof(struct in_addr), 564 .cmp = prison_qcmp_v4, 565 .valid = prison_valid_v4, 566 .ip_flag = PR_IP4_USER, 567 }, 568 #endif 569 #ifdef INET6 570 [PR_INET6] = { 571 .size = sizeof(struct in6_addr), 572 .cmp = prison_qcmp_v6, 573 .valid = prison_valid_v6, 574 .ip_flag = PR_IP6_USER, 575 }, 576 #endif 577 }; 578 579 /* 580 * Network address lists (pr_addrs) allocation for jails. The addresses 581 * are accessed locklessly by the network stack, thus need to be protected by 582 * the network epoch. 583 */ 584 struct prison_ip { 585 struct epoch_context ctx; 586 uint32_t ips; 587 #ifdef FUTURE_C 588 /* 589 * XXX Variable-length automatic arrays in union may be 590 * supported in future C. 591 */ 592 union { 593 char pr_ip[]; 594 struct in_addr pr_ip4[]; 595 struct in6_addr pr_ip6[]; 596 }; 597 #else /* No future C :( */ 598 char pr_ip[]; 599 #endif 600 }; 601 602 static char * 603 PR_IP(struct prison_ip *pip, const pr_family_t af, int idx) 604 { 605 MPASS(pip); 606 MPASS(af < PR_FAMILY_MAX); 607 MPASS(idx >= 0 && idx < pip->ips); 608 609 return (pip->pr_ip + pr_families[af].size * idx); 610 } 611 612 static struct prison_ip * 613 prison_ip_alloc(const pr_family_t af, uint32_t cnt, int flags) 614 { 615 struct prison_ip *pip; 616 617 pip = malloc(sizeof(struct prison_ip) + cnt * pr_families[af].size, 618 M_PRISON, flags); 619 if (pip != NULL) 620 pip->ips = cnt; 621 return (pip); 622 } 623 624 /* 625 * Allocate and copyin user supplied address list, sorting and validating. 626 * kern_jail_set() helper. 627 */ 628 static struct prison_ip * 629 prison_ip_copyin(const pr_family_t af, void *op, uint32_t cnt) 630 { 631 prison_addr_cmp_t *const cmp = pr_families[af].cmp; 632 const size_t size = pr_families[af].size; 633 struct prison_ip *pip; 634 635 pip = prison_ip_alloc(af, cnt, M_WAITOK); 636 bcopy(op, pip->pr_ip, cnt * size); 637 /* 638 * IP addresses are all sorted but ip[0] to preserve 639 * the primary IP address as given from userland. 640 * This special IP is used for unbound outgoing 641 * connections as well for "loopback" traffic in case 642 * source address selection cannot find any more fitting 643 * address to connect from. 644 */ 645 if (cnt > 1) 646 qsort(PR_IP(pip, af, 1), cnt - 1, size, cmp); 647 /* 648 * Check for duplicate addresses and do some simple 649 * zero and broadcast checks. If users give other bogus 650 * addresses it is their problem. 651 */ 652 for (int i = 0; i < cnt; i++) { 653 if (!pr_families[af].valid(PR_IP(pip, af, i))) { 654 free(pip, M_PRISON); 655 return (NULL); 656 } 657 if (i + 1 < cnt && 658 (cmp(PR_IP(pip, af, 0), PR_IP(pip, af, i + 1)) == 0 || 659 cmp(PR_IP(pip, af, i), PR_IP(pip, af, i + 1)) == 0)) { 660 free(pip, M_PRISON); 661 return (NULL); 662 } 663 } 664 665 return (pip); 666 } 667 668 /* 669 * Allocate and dup parent prison address list. 670 * kern_jail_set() helper. 671 */ 672 static void 673 prison_ip_dup(struct prison *ppr, struct prison *pr, const pr_family_t af) 674 { 675 const struct prison_ip *ppip = ppr->pr_addrs[af]; 676 struct prison_ip *pip; 677 678 if (ppip != NULL) { 679 pip = prison_ip_alloc(af, ppip->ips, M_WAITOK); 680 bcopy(ppip->pr_ip, pip->pr_ip, pip->ips * pr_families[af].size); 681 pr->pr_addrs[af] = pip; 682 } 683 } 684 685 /* 686 * Make sure the new set of IP addresses is a subset of the parent's list. 687 * Don't worry about the parent being unlocked, as any setting is done with 688 * allprison_lock held. 689 * kern_jail_set() helper. 690 */ 691 static bool 692 prison_ip_parent_match(struct prison_ip *ppip, struct prison_ip *pip, 693 const pr_family_t af) 694 { 695 prison_addr_cmp_t *const cmp = pr_families[af].cmp; 696 int i, j; 697 698 if (ppip == NULL) 699 return (false); 700 701 for (i = 0; i < ppip->ips; i++) 702 if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, i)) == 0) 703 break; 704 705 if (i == ppip->ips) 706 /* Main address not present in parent. */ 707 return (false); 708 709 if (pip->ips > 1) { 710 for (i = j = 1; i < pip->ips; i++) { 711 if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0) 712 /* Equals to parent primary address. */ 713 continue; 714 for (; j < ppip->ips; j++) 715 if (cmp(PR_IP(pip, af, i), 716 PR_IP(ppip, af, j)) == 0) 717 break; 718 if (j == ppip->ips) 719 break; 720 } 721 if (j == ppip->ips) 722 /* Address not present in parent. */ 723 return (false); 724 } 725 return (true); 726 } 727 728 /* 729 * Check for conflicting IP addresses. We permit them if there is no more 730 * than one IP on each jail. If there is a duplicate on a jail with more 731 * than one IP stop checking and return error. 732 * kern_jail_set() helper. 733 */ 734 static bool 735 prison_ip_conflict_check(const struct prison *ppr, const struct prison *pr, 736 struct prison_ip *pip, pr_family_t af) 737 { 738 const struct prison *tppr, *tpr; 739 int descend; 740 741 #ifdef VIMAGE 742 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 743 if (tppr->pr_flags & PR_VNET) 744 break; 745 #else 746 tppr = &prison0; 747 #endif 748 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 749 if (tpr == pr || 750 #ifdef VIMAGE 751 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 752 #endif 753 !prison_isalive(tpr)) { 754 descend = 0; 755 continue; 756 } 757 if (!(tpr->pr_flags & pr_families[af].ip_flag)) 758 continue; 759 descend = 0; 760 if (tpr->pr_addrs[af] == NULL || 761 (pip->ips == 1 && tpr->pr_addrs[af]->ips == 1)) 762 continue; 763 for (int i = 0; i < pip->ips; i++) 764 if (prison_ip_check(tpr, af, PR_IP(pip, af, i)) == 0) 765 return (false); 766 } 767 768 return (true); 769 } 770 771 _Static_assert(offsetof(struct prison_ip, ctx) == 0, 772 "prison must start with epoch context"); 773 static void 774 prison_ip_free_deferred(epoch_context_t ctx) 775 { 776 777 free(ctx, M_PRISON); 778 } 779 780 static void 781 prison_ip_free(struct prison_ip *pip) 782 { 783 784 if (pip != NULL) 785 NET_EPOCH_CALL(prison_ip_free_deferred, &pip->ctx); 786 } 787 788 static void 789 prison_ip_set(struct prison *pr, const pr_family_t af, struct prison_ip *new) 790 { 791 struct prison_ip **mem, *old; 792 793 mtx_assert(&pr->pr_mtx, MA_OWNED); 794 795 mem = &pr->pr_addrs[af]; 796 797 old = *mem; 798 atomic_store_ptr(mem, new); 799 prison_ip_free(old); 800 } 801 802 /* 803 * Restrict a prison's IP address list with its parent's, possibly replacing 804 * it. Return true if succeed, otherwise should redo. 805 * kern_jail_set() helper. 806 */ 807 static bool 808 prison_ip_restrict(struct prison *pr, const pr_family_t af, 809 struct prison_ip **newp) 810 { 811 struct prison_ip *ppip = pr->pr_parent->pr_addrs[af]; 812 struct prison_ip *pip = pr->pr_addrs[af]; 813 int (*const cmp)(const void *, const void *) = pr_families[af].cmp; 814 const size_t size = pr_families[af].size; 815 struct prison_ip *new = newp != NULL ? *newp : NULL; 816 uint32_t ips; 817 818 mtx_assert(&pr->pr_mtx, MA_OWNED); 819 820 /* 821 * Due to epoch-synchronized access to the IP address lists we always 822 * allocate a new list even if the old one has enough space. We could 823 * atomically update an IPv4 address inside a list, but that would 824 * screw up sorting, and in case of IPv6 we can't even atomically write 825 * one. 826 */ 827 if (ppip == NULL) { 828 if (pip != NULL) 829 prison_ip_set(pr, af, NULL); 830 return (true); 831 } 832 833 if (!(pr->pr_flags & pr_families[af].ip_flag)) { 834 if (new == NULL) { 835 new = prison_ip_alloc(af, ppip->ips, M_NOWAIT); 836 if (new == NULL) 837 return (false); /* Redo */ 838 } 839 /* This has no user settings, so just copy the parent's list. */ 840 MPASS(new->ips == ppip->ips); 841 bcopy(ppip->pr_ip, new->pr_ip, ppip->ips * size); 842 prison_ip_set(pr, af, new); 843 if (newp != NULL) 844 *newp = NULL; /* Used */ 845 } else if (pip != NULL) { 846 /* Remove addresses that aren't in the parent. */ 847 int i; 848 849 i = 0; /* index in pip */ 850 ips = 0; /* index in new */ 851 852 if (new == NULL) { 853 new = prison_ip_alloc(af, pip->ips, M_NOWAIT); 854 if (new == NULL) 855 return (false); /* Redo */ 856 } 857 858 for (int pi = 0; pi < ppip->ips; pi++) 859 if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, pi)) == 0) { 860 /* Found our primary address in parent. */ 861 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips), 862 size); 863 i++; 864 ips++; 865 break; 866 } 867 for (int pi = 1; i < pip->ips; ) { 868 /* Check against primary, which is unsorted. */ 869 if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0) { 870 /* Matches parent's primary address. */ 871 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips), 872 size); 873 i++; 874 ips++; 875 continue; 876 } 877 /* The rest are sorted. */ 878 switch (pi >= ppip->ips ? -1 : 879 cmp(PR_IP(pip, af, i), PR_IP(ppip, af, pi))) { 880 case -1: 881 i++; 882 break; 883 case 0: 884 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips), 885 size); 886 i++; 887 pi++; 888 ips++; 889 break; 890 case 1: 891 pi++; 892 break; 893 } 894 } 895 if (ips == 0) { 896 if (newp == NULL || *newp == NULL) 897 prison_ip_free(new); 898 new = NULL; 899 } else { 900 /* Shrink to real size */ 901 KASSERT((new->ips >= ips), 902 ("Out-of-bounds write to prison_ip %p", new)); 903 new->ips = ips; 904 } 905 prison_ip_set(pr, af, new); 906 if (newp != NULL) 907 *newp = NULL; /* Used */ 908 } 909 return (true); 910 } 911 912 /* 913 * Fast-path check if an address belongs to a prison. 914 */ 915 int 916 prison_ip_check(const struct prison *pr, const pr_family_t af, 917 const void *addr) 918 { 919 int (*const cmp)(const void *, const void *) = pr_families[af].cmp; 920 struct prison_ip *pip; 921 int i, a, z, d; 922 923 MPASS(mtx_owned(&pr->pr_mtx) || 924 in_epoch(net_epoch_preempt) || 925 sx_xlocked(&allprison_lock)); 926 927 pip = atomic_load_ptr(&pr->pr_addrs[af]); 928 if (__predict_false(pip == NULL)) 929 return (EAFNOSUPPORT); 930 931 /* Check the primary IP. */ 932 if (cmp(PR_IP(pip, af, 0), addr) == 0) 933 return (0); 934 935 /* 936 * All the other IPs are sorted so we can do a binary search. 937 */ 938 a = 0; 939 z = pip->ips - 2; 940 while (a <= z) { 941 i = (a + z) / 2; 942 d = cmp(PR_IP(pip, af, i + 1), addr); 943 if (d > 0) 944 z = i - 1; 945 else if (d < 0) 946 a = i + 1; 947 else 948 return (0); 949 } 950 951 return (EADDRNOTAVAIL); 952 } 953 954 /* 955 * Grab primary IP. Historically required mutex, but nothing prevents 956 * us to support epoch-protected access. Is it used in fast path? 957 * in{6}_jail.c helper 958 */ 959 const void * 960 prison_ip_get0(const struct prison *pr, const pr_family_t af) 961 { 962 const struct prison_ip *pip = pr->pr_addrs[af]; 963 964 mtx_assert(&pr->pr_mtx, MA_OWNED); 965 MPASS(pip); 966 967 return (pip->pr_ip); 968 } 969 970 u_int 971 prison_ip_cnt(const struct prison *pr, const pr_family_t af) 972 { 973 974 return (pr->pr_addrs[af]->ips); 975 } 976 #endif /* defined(INET) || defined(INET6) */ 977 978 int 979 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 980 { 981 struct nameidata nd; 982 #ifdef INET 983 struct prison_ip *ip4; 984 #endif 985 #ifdef INET6 986 struct prison_ip *ip6; 987 #endif 988 struct vfsopt *opt; 989 struct vfsoptlist *opts; 990 struct prison *pr, *deadpr, *dinspr, *inspr, *mypr, *ppr, *tpr; 991 struct vnode *root; 992 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 993 char *g_path, *osrelstr; 994 struct bool_flags *bf; 995 struct jailsys_flags *jsf; 996 #if defined(INET) || defined(INET6) 997 void *op; 998 #endif 999 unsigned long hid; 1000 size_t namelen, onamelen, pnamelen; 1001 int created, cuflags, descend, drflags, enforce; 1002 int error, errmsg_len, errmsg_pos; 1003 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 1004 int deadid, jid, jsys, len, level; 1005 int childmax, osreldt, rsnum, slevel; 1006 #ifdef INET 1007 int ip4s; 1008 bool redo_ip4; 1009 #endif 1010 #ifdef INET6 1011 int ip6s; 1012 bool redo_ip6; 1013 #endif 1014 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 1015 uint64_t pr_allow_diff; 1016 unsigned tallow; 1017 char numbuf[12]; 1018 1019 error = priv_check(td, PRIV_JAIL_SET); 1020 if (!error && (flags & JAIL_ATTACH)) 1021 error = priv_check(td, PRIV_JAIL_ATTACH); 1022 if (error) 1023 return (error); 1024 mypr = td->td_ucred->cr_prison; 1025 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 1026 return (EPERM); 1027 if (flags & ~JAIL_SET_MASK) 1028 return (EINVAL); 1029 1030 /* 1031 * Check all the parameters before committing to anything. Not all 1032 * errors can be caught early, but we may as well try. Also, this 1033 * takes care of some expensive stuff (path lookup) before getting 1034 * the allprison lock. 1035 * 1036 * XXX Jails are not filesystems, and jail parameters are not mount 1037 * options. But it makes more sense to re-use the vfsopt code 1038 * than duplicate it under a different name. 1039 */ 1040 error = vfs_buildopts(optuio, &opts); 1041 if (error) 1042 return (error); 1043 #ifdef INET 1044 ip4 = NULL; 1045 #endif 1046 #ifdef INET6 1047 ip6 = NULL; 1048 #endif 1049 g_path = NULL; 1050 1051 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 1052 if (!cuflags) { 1053 error = EINVAL; 1054 vfs_opterror(opts, "no valid operation (create or update)"); 1055 goto done_errmsg; 1056 } 1057 1058 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1059 if (error == ENOENT) 1060 jid = 0; 1061 else if (error != 0) 1062 goto done_free; 1063 1064 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 1065 if (error == ENOENT) 1066 gotslevel = 0; 1067 else if (error != 0) 1068 goto done_free; 1069 else 1070 gotslevel = 1; 1071 1072 error = 1073 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 1074 if (error == ENOENT) 1075 gotchildmax = 0; 1076 else if (error != 0) 1077 goto done_free; 1078 else 1079 gotchildmax = 1; 1080 1081 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 1082 if (error == ENOENT) 1083 gotenforce = 0; 1084 else if (error != 0) 1085 goto done_free; 1086 else if (enforce < 0 || enforce > 2) { 1087 error = EINVAL; 1088 goto done_free; 1089 } else 1090 gotenforce = 1; 1091 1092 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 1093 if (error == ENOENT) 1094 gotrsnum = 0; 1095 else if (error != 0) 1096 goto done_free; 1097 else 1098 gotrsnum = 1; 1099 1100 pr_flags = ch_flags = 0; 1101 for (bf = pr_flag_bool; 1102 bf < pr_flag_bool + nitems(pr_flag_bool); 1103 bf++) { 1104 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag); 1105 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag); 1106 } 1107 ch_flags |= pr_flags; 1108 for (jsf = pr_flag_jailsys; 1109 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 1110 jsf++) { 1111 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys)); 1112 if (error == ENOENT) 1113 continue; 1114 if (error != 0) 1115 goto done_free; 1116 switch (jsys) { 1117 case JAIL_SYS_DISABLE: 1118 if (!jsf->disable) { 1119 error = EINVAL; 1120 goto done_free; 1121 } 1122 pr_flags |= jsf->disable; 1123 break; 1124 case JAIL_SYS_NEW: 1125 pr_flags |= jsf->new; 1126 break; 1127 case JAIL_SYS_INHERIT: 1128 break; 1129 default: 1130 error = EINVAL; 1131 goto done_free; 1132 } 1133 ch_flags |= jsf->new | jsf->disable; 1134 } 1135 if ((flags & (JAIL_CREATE | JAIL_ATTACH)) == JAIL_CREATE 1136 && !(pr_flags & PR_PERSIST)) { 1137 error = EINVAL; 1138 vfs_opterror(opts, "new jail must persist or attach"); 1139 goto done_errmsg; 1140 } 1141 #ifdef VIMAGE 1142 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 1143 error = EINVAL; 1144 vfs_opterror(opts, "vnet cannot be changed after creation"); 1145 goto done_errmsg; 1146 } 1147 #endif 1148 #ifdef INET 1149 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 1150 error = EINVAL; 1151 vfs_opterror(opts, "ip4 cannot be changed after creation"); 1152 goto done_errmsg; 1153 } 1154 #endif 1155 #ifdef INET6 1156 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 1157 error = EINVAL; 1158 vfs_opterror(opts, "ip6 cannot be changed after creation"); 1159 goto done_errmsg; 1160 } 1161 #endif 1162 1163 pr_allow = ch_allow = 0; 1164 for (bf = pr_flag_allow; 1165 bf < pr_flag_allow + nitems(pr_flag_allow) && 1166 atomic_load_int(&bf->flag) != 0; 1167 bf++) { 1168 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag); 1169 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag); 1170 } 1171 ch_allow |= pr_allow; 1172 1173 error = vfs_getopt(opts, "name", (void **)&name, &len); 1174 if (error == ENOENT) 1175 name = NULL; 1176 else if (error != 0) 1177 goto done_free; 1178 else { 1179 if (len == 0 || name[len - 1] != '\0') { 1180 error = EINVAL; 1181 goto done_free; 1182 } 1183 if (len > MAXHOSTNAMELEN) { 1184 error = ENAMETOOLONG; 1185 goto done_free; 1186 } 1187 } 1188 1189 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 1190 if (error == ENOENT) 1191 host = NULL; 1192 else if (error != 0) 1193 goto done_free; 1194 else { 1195 ch_flags |= PR_HOST; 1196 pr_flags |= PR_HOST; 1197 if (len == 0 || host[len - 1] != '\0') { 1198 error = EINVAL; 1199 goto done_free; 1200 } 1201 if (len > MAXHOSTNAMELEN) { 1202 error = ENAMETOOLONG; 1203 goto done_free; 1204 } 1205 } 1206 1207 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 1208 if (error == ENOENT) 1209 domain = NULL; 1210 else if (error != 0) 1211 goto done_free; 1212 else { 1213 ch_flags |= PR_HOST; 1214 pr_flags |= PR_HOST; 1215 if (len == 0 || domain[len - 1] != '\0') { 1216 error = EINVAL; 1217 goto done_free; 1218 } 1219 if (len > MAXHOSTNAMELEN) { 1220 error = ENAMETOOLONG; 1221 goto done_free; 1222 } 1223 } 1224 1225 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 1226 if (error == ENOENT) 1227 uuid = NULL; 1228 else if (error != 0) 1229 goto done_free; 1230 else { 1231 ch_flags |= PR_HOST; 1232 pr_flags |= PR_HOST; 1233 if (len == 0 || uuid[len - 1] != '\0') { 1234 error = EINVAL; 1235 goto done_free; 1236 } 1237 if (len > HOSTUUIDLEN) { 1238 error = ENAMETOOLONG; 1239 goto done_free; 1240 } 1241 } 1242 1243 #ifdef COMPAT_FREEBSD32 1244 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 1245 uint32_t hid32; 1246 1247 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 1248 hid = hid32; 1249 } else 1250 #endif 1251 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 1252 if (error == ENOENT) 1253 gothid = 0; 1254 else if (error != 0) 1255 goto done_free; 1256 else { 1257 gothid = 1; 1258 ch_flags |= PR_HOST; 1259 pr_flags |= PR_HOST; 1260 } 1261 1262 #ifdef INET 1263 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 1264 if (error == ENOENT) 1265 ip4s = 0; 1266 else if (error != 0) 1267 goto done_free; 1268 else if (ip4s & (sizeof(struct in_addr) - 1)) { 1269 error = EINVAL; 1270 goto done_free; 1271 } else { 1272 ch_flags |= PR_IP4_USER; 1273 pr_flags |= PR_IP4_USER; 1274 if (ip4s > 0) { 1275 ip4s /= sizeof(struct in_addr); 1276 if (ip4s > jail_max_af_ips) { 1277 error = EINVAL; 1278 vfs_opterror(opts, "too many IPv4 addresses"); 1279 goto done_errmsg; 1280 } 1281 ip4 = prison_ip_copyin(PR_INET, op, ip4s); 1282 if (ip4 == NULL) { 1283 error = EINVAL; 1284 goto done_free; 1285 } 1286 } 1287 } 1288 #endif 1289 1290 #ifdef INET6 1291 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 1292 if (error == ENOENT) 1293 ip6s = 0; 1294 else if (error != 0) 1295 goto done_free; 1296 else if (ip6s & (sizeof(struct in6_addr) - 1)) { 1297 error = EINVAL; 1298 goto done_free; 1299 } else { 1300 ch_flags |= PR_IP6_USER; 1301 pr_flags |= PR_IP6_USER; 1302 if (ip6s > 0) { 1303 ip6s /= sizeof(struct in6_addr); 1304 if (ip6s > jail_max_af_ips) { 1305 error = EINVAL; 1306 vfs_opterror(opts, "too many IPv6 addresses"); 1307 goto done_errmsg; 1308 } 1309 ip6 = prison_ip_copyin(PR_INET6, op, ip6s); 1310 if (ip6 == NULL) { 1311 error = EINVAL; 1312 goto done_free; 1313 } 1314 } 1315 } 1316 #endif 1317 1318 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1319 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1320 error = EINVAL; 1321 vfs_opterror(opts, 1322 "vnet jails cannot have IP address restrictions"); 1323 goto done_errmsg; 1324 } 1325 #endif 1326 1327 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 1328 if (error == ENOENT) 1329 osrelstr = NULL; 1330 else if (error != 0) 1331 goto done_free; 1332 else { 1333 if (flags & JAIL_UPDATE) { 1334 error = EINVAL; 1335 vfs_opterror(opts, 1336 "osrelease cannot be changed after creation"); 1337 goto done_errmsg; 1338 } 1339 if (len == 0 || osrelstr[len - 1] != '\0') { 1340 error = EINVAL; 1341 goto done_free; 1342 } 1343 if (len >= OSRELEASELEN) { 1344 error = ENAMETOOLONG; 1345 vfs_opterror(opts, 1346 "osrelease string must be 1-%d bytes long", 1347 OSRELEASELEN - 1); 1348 goto done_errmsg; 1349 } 1350 } 1351 1352 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 1353 if (error == ENOENT) 1354 osreldt = 0; 1355 else if (error != 0) 1356 goto done_free; 1357 else { 1358 if (flags & JAIL_UPDATE) { 1359 error = EINVAL; 1360 vfs_opterror(opts, 1361 "osreldate cannot be changed after creation"); 1362 goto done_errmsg; 1363 } 1364 if (osreldt == 0) { 1365 error = EINVAL; 1366 vfs_opterror(opts, "osreldate cannot be 0"); 1367 goto done_errmsg; 1368 } 1369 } 1370 1371 root = NULL; 1372 error = vfs_getopt(opts, "path", (void **)&path, &len); 1373 if (error == ENOENT) 1374 path = NULL; 1375 else if (error != 0) 1376 goto done_free; 1377 else { 1378 if (flags & JAIL_UPDATE) { 1379 error = EINVAL; 1380 vfs_opterror(opts, 1381 "path cannot be changed after creation"); 1382 goto done_errmsg; 1383 } 1384 if (len == 0 || path[len - 1] != '\0') { 1385 error = EINVAL; 1386 goto done_free; 1387 } 1388 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path); 1389 error = namei(&nd); 1390 if (error) 1391 goto done_free; 1392 root = nd.ni_vp; 1393 NDFREE_PNBUF(&nd); 1394 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1395 strlcpy(g_path, path, MAXPATHLEN); 1396 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 1397 if (error == 0) { 1398 path = g_path; 1399 } else { 1400 /* exit on other errors */ 1401 goto done_free; 1402 } 1403 if (root->v_type != VDIR) { 1404 error = ENOTDIR; 1405 vput(root); 1406 goto done_free; 1407 } 1408 VOP_UNLOCK(root); 1409 } 1410 1411 /* 1412 * Find the specified jail, or at least its parent. 1413 * This abuses the file error codes ENOENT and EEXIST. 1414 */ 1415 pr = NULL; 1416 inspr = NULL; 1417 deadpr = NULL; 1418 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 1419 namelc = strrchr(name, '.'); 1420 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 1421 if (*p != '\0') 1422 jid = 0; 1423 } 1424 sx_xlock(&allprison_lock); 1425 drflags = PD_LIST_XLOCKED; 1426 ppr = mypr; 1427 if (!prison_isalive(ppr)) { 1428 /* This jail is dying. This process will surely follow. */ 1429 error = EAGAIN; 1430 goto done_deref; 1431 } 1432 if (jid != 0) { 1433 if (jid < 0) { 1434 error = EINVAL; 1435 vfs_opterror(opts, "negative jid"); 1436 goto done_deref; 1437 } 1438 /* 1439 * See if a requested jid already exists. Keep track of 1440 * where it can be inserted later. 1441 */ 1442 TAILQ_FOREACH(inspr, &allprison, pr_list) { 1443 if (inspr->pr_id < jid) 1444 continue; 1445 if (inspr->pr_id > jid) 1446 break; 1447 if (prison_isalive(inspr)) { 1448 pr = inspr; 1449 mtx_lock(&pr->pr_mtx); 1450 drflags |= PD_LOCKED; 1451 } else { 1452 /* Note a dying jail to handle later. */ 1453 deadpr = inspr; 1454 } 1455 inspr = NULL; 1456 break; 1457 } 1458 if (cuflags == JAIL_CREATE && pr != NULL) { 1459 /* 1460 * Even creators that cannot see the jail will 1461 * get EEXIST. 1462 */ 1463 error = EEXIST; 1464 vfs_opterror(opts, "jail %d already exists", jid); 1465 goto done_deref; 1466 } 1467 if ((pr == NULL) 1468 ? cuflags == JAIL_UPDATE 1469 : !prison_ischild(mypr, pr)) { 1470 /* 1471 * Updaters get ENOENT for nonexistent jails, 1472 * or for jails they cannot see. The latter 1473 * case is true even for CREATE | UPDATE, 1474 * which normally cannot give this error. 1475 */ 1476 error = ENOENT; 1477 vfs_opterror(opts, "jail %d not found", jid); 1478 goto done_deref; 1479 } 1480 } 1481 /* 1482 * If the caller provided a name, look for a jail by that name. 1483 * This has different semantics for creates and updates keyed by jid 1484 * (where the name must not already exist in a different jail), 1485 * and updates keyed by the name itself (where the name must exist 1486 * because that is the jail being updated). 1487 */ 1488 namelc = NULL; 1489 if (name != NULL) { 1490 namelc = strrchr(name, '.'); 1491 if (namelc == NULL) 1492 namelc = name; 1493 else { 1494 /* 1495 * This is a hierarchical name. Split it into the 1496 * parent and child names, and make sure the parent 1497 * exists or matches an already found jail. 1498 */ 1499 if (pr != NULL) { 1500 if (strncmp(name, ppr->pr_name, namelc - name) 1501 || ppr->pr_name[namelc - name] != '\0') { 1502 error = EINVAL; 1503 vfs_opterror(opts, 1504 "cannot change jail's parent"); 1505 goto done_deref; 1506 } 1507 } else { 1508 *namelc = '\0'; 1509 ppr = prison_find_name(mypr, name); 1510 if (ppr == NULL) { 1511 error = ENOENT; 1512 vfs_opterror(opts, 1513 "jail \"%s\" not found", name); 1514 goto done_deref; 1515 } 1516 mtx_unlock(&ppr->pr_mtx); 1517 if (!prison_isalive(ppr)) { 1518 error = ENOENT; 1519 vfs_opterror(opts, 1520 "jail \"%s\" is dying", name); 1521 goto done_deref; 1522 } 1523 *namelc = '.'; 1524 } 1525 namelc++; 1526 } 1527 if (namelc[0] != '\0') { 1528 pnamelen = 1529 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1530 FOREACH_PRISON_CHILD(ppr, tpr) { 1531 if (tpr == pr || !prison_isalive(tpr) || 1532 strcmp(tpr->pr_name + pnamelen, namelc)) 1533 continue; 1534 if (cuflags == JAIL_CREATE || pr != NULL) { 1535 /* 1536 * Create, or update(jid): name must 1537 * not exist in an active sibling jail. 1538 */ 1539 error = EEXIST; 1540 vfs_opterror(opts, 1541 "jail \"%s\" already exists", name); 1542 goto done_deref; 1543 } 1544 /* Use this jail for updates. */ 1545 pr = tpr; 1546 mtx_lock(&pr->pr_mtx); 1547 drflags |= PD_LOCKED; 1548 break; 1549 } 1550 /* 1551 * Update: name must exist if no jid is specified. 1552 * As with the jid case, the jail must be currently 1553 * visible, or else even CREATE | UPDATE will get 1554 * an error. 1555 */ 1556 if ((pr == NULL) 1557 ? cuflags == JAIL_UPDATE 1558 : !prison_isalive(pr)) { 1559 error = ENOENT; 1560 vfs_opterror(opts, "jail \"%s\" not found", 1561 name); 1562 goto done_deref; 1563 } 1564 } 1565 } 1566 /* Update: must provide a jid or name. */ 1567 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1568 error = ENOENT; 1569 vfs_opterror(opts, "update specified no jail"); 1570 goto done_deref; 1571 } 1572 1573 /* If there's no prison to update, create a new one and link it in. */ 1574 created = pr == NULL; 1575 if (created) { 1576 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1577 if (tpr->pr_childcount >= tpr->pr_childmax) { 1578 error = EPERM; 1579 vfs_opterror(opts, "prison limit exceeded"); 1580 goto done_deref; 1581 } 1582 1583 if (deadpr != NULL) { 1584 /* 1585 * The prison being created has the same ID as a dying 1586 * one. Handle this by giving the dying jail a new ID. 1587 * This may cause some confusion to user space, but 1588 * only to those listing dying jails. 1589 */ 1590 deadid = get_next_deadid(&dinspr); 1591 if (deadid == 0) { 1592 error = EAGAIN; 1593 vfs_opterror(opts, "no available jail IDs"); 1594 goto done_deref; 1595 } 1596 mtx_lock(&deadpr->pr_mtx); 1597 deadpr->pr_id = deadid; 1598 mtx_unlock(&deadpr->pr_mtx); 1599 if (dinspr == deadpr) 1600 inspr = deadpr; 1601 else { 1602 inspr = TAILQ_NEXT(deadpr, pr_list); 1603 TAILQ_REMOVE(&allprison, deadpr, pr_list); 1604 if (dinspr != NULL) 1605 TAILQ_INSERT_AFTER(&allprison, dinspr, 1606 deadpr, pr_list); 1607 else 1608 TAILQ_INSERT_HEAD(&allprison, deadpr, 1609 pr_list); 1610 } 1611 } 1612 if (jid == 0 && (jid = get_next_prid(&inspr)) == 0) { 1613 error = EAGAIN; 1614 vfs_opterror(opts, "no available jail IDs"); 1615 goto done_deref; 1616 } 1617 1618 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1619 pr->pr_state = PRISON_STATE_INVALID; 1620 refcount_init(&pr->pr_ref, 1); 1621 refcount_init(&pr->pr_uref, 0); 1622 drflags |= PD_DEREF; 1623 LIST_INIT(&pr->pr_children); 1624 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1625 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1626 1627 pr->pr_id = jid; 1628 if (inspr != NULL) 1629 TAILQ_INSERT_BEFORE(inspr, pr, pr_list); 1630 else 1631 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1632 1633 pr->pr_parent = ppr; 1634 prison_hold(ppr); 1635 prison_proc_hold(ppr); 1636 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1637 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1638 tpr->pr_childcount++; 1639 1640 /* Set some default values, and inherit some from the parent. */ 1641 if (namelc == NULL) 1642 namelc = ""; 1643 if (path == NULL) { 1644 path = "/"; 1645 root = mypr->pr_root; 1646 vref(root); 1647 } 1648 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1649 pr->pr_flags |= PR_HOST; 1650 #if defined(INET) || defined(INET6) 1651 #ifdef VIMAGE 1652 if (!(pr_flags & PR_VNET)) 1653 #endif 1654 { 1655 #ifdef INET 1656 if (!(ch_flags & PR_IP4_USER)) 1657 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1658 else if (!(pr_flags & PR_IP4_USER)) { 1659 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1660 prison_ip_dup(ppr, pr, PR_INET); 1661 } 1662 #endif 1663 #ifdef INET6 1664 if (!(ch_flags & PR_IP6_USER)) 1665 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1666 else if (!(pr_flags & PR_IP6_USER)) { 1667 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1668 prison_ip_dup(ppr, pr, PR_INET6); 1669 } 1670 #endif 1671 } 1672 #endif 1673 /* Source address selection is always on by default. */ 1674 pr->pr_flags |= _PR_IP_SADDRSEL; 1675 1676 pr->pr_securelevel = ppr->pr_securelevel; 1677 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1678 pr->pr_enforce_statfs = jail_default_enforce_statfs; 1679 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1680 1681 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1682 if (osrelstr == NULL) 1683 strlcpy(pr->pr_osrelease, ppr->pr_osrelease, 1684 sizeof(pr->pr_osrelease)); 1685 else 1686 strlcpy(pr->pr_osrelease, osrelstr, 1687 sizeof(pr->pr_osrelease)); 1688 1689 #ifdef VIMAGE 1690 /* 1691 * Allocate a new vnet if specified. 1692 * 1693 * Set PR_VNET now if so, so that the vnet is disposed of 1694 * properly when the jail is destroyed. 1695 */ 1696 if (pr_flags & PR_VNET) { 1697 pr->pr_flags |= PR_VNET; 1698 pr->pr_vnet = vnet_alloc(); 1699 } else { 1700 pr->pr_vnet = ppr->pr_vnet; 1701 } 1702 #endif 1703 /* 1704 * Allocate a dedicated cpuset for each jail. 1705 * Unlike other initial settings, this may return an error. 1706 */ 1707 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1708 if (error) 1709 goto done_deref; 1710 1711 mtx_lock(&pr->pr_mtx); 1712 drflags |= PD_LOCKED; 1713 } else { 1714 /* 1715 * Grab a reference for existing prisons, to ensure they 1716 * continue to exist for the duration of the call. 1717 */ 1718 prison_hold(pr); 1719 drflags |= PD_DEREF; 1720 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1721 if ((pr->pr_flags & PR_VNET) && 1722 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1723 error = EINVAL; 1724 vfs_opterror(opts, 1725 "vnet jails cannot have IP address restrictions"); 1726 goto done_deref; 1727 } 1728 #endif 1729 #ifdef INET 1730 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1731 error = EINVAL; 1732 vfs_opterror(opts, 1733 "ip4 cannot be changed after creation"); 1734 goto done_deref; 1735 } 1736 #endif 1737 #ifdef INET6 1738 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1739 error = EINVAL; 1740 vfs_opterror(opts, 1741 "ip6 cannot be changed after creation"); 1742 goto done_deref; 1743 } 1744 #endif 1745 } 1746 1747 /* Do final error checking before setting anything. */ 1748 if (gotslevel) { 1749 if (slevel < ppr->pr_securelevel) { 1750 error = EPERM; 1751 goto done_deref; 1752 } 1753 } 1754 if (gotchildmax) { 1755 if (childmax >= ppr->pr_childmax) { 1756 error = EPERM; 1757 goto done_deref; 1758 } 1759 } 1760 if (gotenforce) { 1761 if (enforce < ppr->pr_enforce_statfs) { 1762 error = EPERM; 1763 goto done_deref; 1764 } 1765 } 1766 if (gotrsnum) { 1767 /* 1768 * devfs_rsnum is a uint16_t 1769 */ 1770 if (rsnum < 0 || rsnum > 65535) { 1771 error = EINVAL; 1772 goto done_deref; 1773 } 1774 /* 1775 * Nested jails always inherit parent's devfs ruleset 1776 */ 1777 if (jailed(td->td_ucred)) { 1778 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1779 error = EPERM; 1780 goto done_deref; 1781 } else 1782 rsnum = ppr->pr_devfs_rsnum; 1783 } 1784 } 1785 #ifdef INET 1786 if (ip4s > 0) { 1787 if ((ppr->pr_flags & PR_IP4) && 1788 !prison_ip_parent_match(ppr->pr_addrs[PR_INET], ip4, 1789 PR_INET)) { 1790 error = EPERM; 1791 goto done_deref; 1792 } 1793 if (!prison_ip_conflict_check(ppr, pr, ip4, PR_INET)) { 1794 error = EADDRINUSE; 1795 vfs_opterror(opts, "IPv4 addresses clash"); 1796 goto done_deref; 1797 } 1798 } 1799 #endif 1800 #ifdef INET6 1801 if (ip6s > 0) { 1802 if ((ppr->pr_flags & PR_IP6) && 1803 !prison_ip_parent_match(ppr->pr_addrs[PR_INET6], ip6, 1804 PR_INET6)) { 1805 error = EPERM; 1806 goto done_deref; 1807 } 1808 if (!prison_ip_conflict_check(ppr, pr, ip6, PR_INET6)) { 1809 error = EADDRINUSE; 1810 vfs_opterror(opts, "IPv6 addresses clash"); 1811 goto done_deref; 1812 } 1813 } 1814 #endif 1815 onamelen = namelen = 0; 1816 if (namelc != NULL) { 1817 /* Give a default name of the jid. Also allow the name to be 1818 * explicitly the jid - but not any other number, and only in 1819 * normal form (no leading zero/etc). 1820 */ 1821 if (namelc[0] == '\0') 1822 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 1823 else if ((strtoul(namelc, &p, 10) != jid || 1824 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1825 error = EINVAL; 1826 vfs_opterror(opts, 1827 "name cannot be numeric (unless it is the jid)"); 1828 goto done_deref; 1829 } 1830 /* 1831 * Make sure the name isn't too long for the prison or its 1832 * children. 1833 */ 1834 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1835 onamelen = strlen(pr->pr_name + pnamelen); 1836 namelen = strlen(namelc); 1837 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1838 error = ENAMETOOLONG; 1839 goto done_deref; 1840 } 1841 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1842 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1843 sizeof(pr->pr_name)) { 1844 error = ENAMETOOLONG; 1845 goto done_deref; 1846 } 1847 } 1848 } 1849 pr_allow_diff = pr_allow & ~ppr->pr_allow; 1850 if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) { 1851 error = EPERM; 1852 goto done_deref; 1853 } 1854 1855 /* 1856 * Let modules check their parameters. This requires unlocking and 1857 * then re-locking the prison, but this is still a valid state as long 1858 * as allprison_lock remains xlocked. 1859 */ 1860 mtx_unlock(&pr->pr_mtx); 1861 drflags &= ~PD_LOCKED; 1862 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1863 if (error != 0) 1864 goto done_deref; 1865 mtx_lock(&pr->pr_mtx); 1866 drflags |= PD_LOCKED; 1867 1868 /* At this point, all valid parameters should have been noted. */ 1869 TAILQ_FOREACH(opt, opts, link) { 1870 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1871 error = EINVAL; 1872 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1873 goto done_deref; 1874 } 1875 } 1876 1877 /* Set the parameters of the prison. */ 1878 #ifdef INET 1879 redo_ip4 = false; 1880 if (pr_flags & PR_IP4_USER) { 1881 pr->pr_flags |= PR_IP4; 1882 prison_ip_set(pr, PR_INET, ip4); 1883 ip4 = NULL; 1884 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1885 #ifdef VIMAGE 1886 if (tpr->pr_flags & PR_VNET) { 1887 descend = 0; 1888 continue; 1889 } 1890 #endif 1891 if (!prison_ip_restrict(tpr, PR_INET, NULL)) { 1892 redo_ip4 = true; 1893 descend = 0; 1894 } 1895 } 1896 } 1897 #endif 1898 #ifdef INET6 1899 redo_ip6 = false; 1900 if (pr_flags & PR_IP6_USER) { 1901 pr->pr_flags |= PR_IP6; 1902 prison_ip_set(pr, PR_INET6, ip6); 1903 ip6 = NULL; 1904 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1905 #ifdef VIMAGE 1906 if (tpr->pr_flags & PR_VNET) { 1907 descend = 0; 1908 continue; 1909 } 1910 #endif 1911 if (!prison_ip_restrict(tpr, PR_INET6, NULL)) { 1912 redo_ip6 = true; 1913 descend = 0; 1914 } 1915 } 1916 } 1917 #endif 1918 if (gotslevel) { 1919 pr->pr_securelevel = slevel; 1920 /* Set all child jails to be at least this level. */ 1921 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1922 if (tpr->pr_securelevel < slevel) 1923 tpr->pr_securelevel = slevel; 1924 } 1925 if (gotchildmax) { 1926 pr->pr_childmax = childmax; 1927 /* Set all child jails to under this limit. */ 1928 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1929 if (tpr->pr_childmax > childmax - level) 1930 tpr->pr_childmax = childmax > level 1931 ? childmax - level : 0; 1932 } 1933 if (gotenforce) { 1934 pr->pr_enforce_statfs = enforce; 1935 /* Pass this restriction on to the children. */ 1936 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1937 if (tpr->pr_enforce_statfs < enforce) 1938 tpr->pr_enforce_statfs = enforce; 1939 } 1940 if (gotrsnum) { 1941 pr->pr_devfs_rsnum = rsnum; 1942 /* Pass this restriction on to the children. */ 1943 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1944 tpr->pr_devfs_rsnum = rsnum; 1945 } 1946 if (namelc != NULL) { 1947 if (ppr == &prison0) 1948 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1949 else 1950 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1951 ppr->pr_name, namelc); 1952 /* Change this component of child names. */ 1953 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1954 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1955 strlen(tpr->pr_name + onamelen) + 1); 1956 bcopy(pr->pr_name, tpr->pr_name, namelen); 1957 } 1958 } 1959 if (path != NULL) { 1960 /* Try to keep a real-rooted full pathname. */ 1961 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1962 pr->pr_root = root; 1963 root = NULL; 1964 } 1965 if (PR_HOST & ch_flags & ~pr_flags) { 1966 if (pr->pr_flags & PR_HOST) { 1967 /* 1968 * Copy the parent's host info. As with pr_ip4 above, 1969 * the lack of a lock on the parent is not a problem; 1970 * it is always set with allprison_lock at least 1971 * shared, and is held exclusively here. 1972 */ 1973 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1974 sizeof(pr->pr_hostname)); 1975 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1976 sizeof(pr->pr_domainname)); 1977 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1978 sizeof(pr->pr_hostuuid)); 1979 pr->pr_hostid = pr->pr_parent->pr_hostid; 1980 } 1981 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1982 /* Set this prison, and any descendants without PR_HOST. */ 1983 if (host != NULL) 1984 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1985 if (domain != NULL) 1986 strlcpy(pr->pr_domainname, domain, 1987 sizeof(pr->pr_domainname)); 1988 if (uuid != NULL) 1989 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1990 if (gothid) 1991 pr->pr_hostid = hid; 1992 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1993 if (tpr->pr_flags & PR_HOST) 1994 descend = 0; 1995 else { 1996 if (host != NULL) 1997 strlcpy(tpr->pr_hostname, 1998 pr->pr_hostname, 1999 sizeof(tpr->pr_hostname)); 2000 if (domain != NULL) 2001 strlcpy(tpr->pr_domainname, 2002 pr->pr_domainname, 2003 sizeof(tpr->pr_domainname)); 2004 if (uuid != NULL) 2005 strlcpy(tpr->pr_hostuuid, 2006 pr->pr_hostuuid, 2007 sizeof(tpr->pr_hostuuid)); 2008 if (gothid) 2009 tpr->pr_hostid = hid; 2010 } 2011 } 2012 } 2013 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 2014 if ((tallow = ch_allow & ~pr_allow)) 2015 prison_set_allow_locked(pr, tallow, 0); 2016 /* 2017 * Persistent prisons get an extra reference, and prisons losing their 2018 * persist flag lose that reference. 2019 */ 2020 if (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags)) { 2021 if (pr_flags & PR_PERSIST) { 2022 prison_hold(pr); 2023 /* 2024 * This may be a new prison's first user reference, 2025 * but wait to call it alive until after OSD calls 2026 * have had a chance to run (and perhaps to fail). 2027 */ 2028 refcount_acquire(&pr->pr_uref); 2029 } else { 2030 drflags |= PD_DEUREF; 2031 prison_free_not_last(pr); 2032 } 2033 } 2034 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 2035 mtx_unlock(&pr->pr_mtx); 2036 drflags &= ~PD_LOCKED; 2037 /* 2038 * Any errors past this point will need to de-persist newly created 2039 * prisons, as well as call remove methods. 2040 */ 2041 if (created) 2042 drflags |= PD_KILL; 2043 2044 #ifdef RACCT 2045 if (racct_enable && created) 2046 prison_racct_attach(pr); 2047 #endif 2048 2049 /* Locks may have prevented a complete restriction of child IP 2050 * addresses. If so, allocate some more memory and try again. 2051 */ 2052 #ifdef INET 2053 while (redo_ip4) { 2054 ip4s = pr->pr_addrs[PR_INET]->ips; 2055 MPASS(ip4 == NULL); 2056 ip4 = prison_ip_alloc(PR_INET, ip4s, M_WAITOK); 2057 mtx_lock(&pr->pr_mtx); 2058 redo_ip4 = false; 2059 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 2060 #ifdef VIMAGE 2061 if (tpr->pr_flags & PR_VNET) { 2062 descend = 0; 2063 continue; 2064 } 2065 #endif 2066 if (!prison_ip_restrict(tpr, PR_INET, &ip4)) 2067 redo_ip4 = true; 2068 } 2069 mtx_unlock(&pr->pr_mtx); 2070 } 2071 #endif 2072 #ifdef INET6 2073 while (redo_ip6) { 2074 ip6s = pr->pr_addrs[PR_INET6]->ips; 2075 MPASS(ip6 == NULL); 2076 ip6 = prison_ip_alloc(PR_INET6, ip6s, M_WAITOK); 2077 mtx_lock(&pr->pr_mtx); 2078 redo_ip6 = false; 2079 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 2080 #ifdef VIMAGE 2081 if (tpr->pr_flags & PR_VNET) { 2082 descend = 0; 2083 continue; 2084 } 2085 #endif 2086 if (!prison_ip_restrict(tpr, PR_INET6, &ip6)) 2087 redo_ip6 = true; 2088 } 2089 mtx_unlock(&pr->pr_mtx); 2090 } 2091 #endif 2092 2093 /* Let the modules do their work. */ 2094 if (created) { 2095 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 2096 if (error) 2097 goto done_deref; 2098 } 2099 error = osd_jail_call(pr, PR_METHOD_SET, opts); 2100 if (error) 2101 goto done_deref; 2102 2103 /* 2104 * A new prison is now ready to be seen; either it has gained a user 2105 * reference via persistence, or is about to gain one via attachment. 2106 */ 2107 if (created) { 2108 drflags = prison_lock_xlock(pr, drflags); 2109 pr->pr_state = PRISON_STATE_ALIVE; 2110 } 2111 2112 /* Attach this process to the prison if requested. */ 2113 if (flags & JAIL_ATTACH) { 2114 error = do_jail_attach(td, pr, 2115 prison_lock_xlock(pr, drflags & PD_LOCK_FLAGS)); 2116 drflags &= ~(PD_LOCKED | PD_LIST_XLOCKED); 2117 if (error) { 2118 vfs_opterror(opts, "attach failed"); 2119 goto done_deref; 2120 } 2121 } 2122 2123 #ifdef RACCT 2124 if (racct_enable && !created) { 2125 if (drflags & PD_LOCKED) { 2126 mtx_unlock(&pr->pr_mtx); 2127 drflags &= ~PD_LOCKED; 2128 } 2129 if (drflags & PD_LIST_XLOCKED) { 2130 sx_xunlock(&allprison_lock); 2131 drflags &= ~PD_LIST_XLOCKED; 2132 } 2133 prison_racct_modify(pr); 2134 } 2135 #endif 2136 2137 if (created && pr != &prison0 && (pr->pr_allow & PR_ALLOW_NFSD) != 0 && 2138 (pr->pr_root->v_vflag & VV_ROOT) == 0) 2139 printf("Warning jail jid=%d: mountd/nfsd requires a separate" 2140 " file system\n", pr->pr_id); 2141 2142 drflags &= ~PD_KILL; 2143 td->td_retval[0] = pr->pr_id; 2144 2145 done_deref: 2146 /* Release any temporary prison holds and/or locks. */ 2147 if (pr != NULL) 2148 prison_deref(pr, drflags); 2149 else if (drflags & PD_LIST_SLOCKED) 2150 sx_sunlock(&allprison_lock); 2151 else if (drflags & PD_LIST_XLOCKED) 2152 sx_xunlock(&allprison_lock); 2153 if (root != NULL) 2154 vrele(root); 2155 done_errmsg: 2156 if (error) { 2157 /* Write the error message back to userspace. */ 2158 if (vfs_getopt(opts, "errmsg", (void **)&errmsg, 2159 &errmsg_len) == 0 && errmsg_len > 0) { 2160 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 2161 if (optuio->uio_segflg == UIO_SYSSPACE) 2162 bcopy(errmsg, 2163 optuio->uio_iov[errmsg_pos].iov_base, 2164 errmsg_len); 2165 else 2166 (void)copyout(errmsg, 2167 optuio->uio_iov[errmsg_pos].iov_base, 2168 errmsg_len); 2169 } 2170 } 2171 done_free: 2172 #ifdef INET 2173 prison_ip_free(ip4); 2174 #endif 2175 #ifdef INET6 2176 prison_ip_free(ip6); 2177 #endif 2178 if (g_path != NULL) 2179 free(g_path, M_TEMP); 2180 vfs_freeopts(opts); 2181 return (error); 2182 } 2183 2184 /* 2185 * Find the next available prison ID. Return the ID on success, or zero 2186 * on failure. Also set a pointer to the allprison list entry the prison 2187 * should be inserted before. 2188 */ 2189 static int 2190 get_next_prid(struct prison **insprp) 2191 { 2192 struct prison *inspr; 2193 int jid, maxid; 2194 2195 jid = lastprid % JAIL_MAX + 1; 2196 if (TAILQ_EMPTY(&allprison) || 2197 TAILQ_LAST(&allprison, prisonlist)->pr_id < jid) { 2198 /* 2199 * A common case is for all jails to be implicitly numbered, 2200 * which means they'll go on the end of the list, at least 2201 * for the first JAIL_MAX times. 2202 */ 2203 inspr = NULL; 2204 } else { 2205 /* 2206 * Take two passes through the allprison list: first starting 2207 * with the proposed jid, then ending with it. 2208 */ 2209 for (maxid = JAIL_MAX; maxid != 0; ) { 2210 TAILQ_FOREACH(inspr, &allprison, pr_list) { 2211 if (inspr->pr_id < jid) 2212 continue; 2213 if (inspr->pr_id > jid) { 2214 /* Found an opening. */ 2215 maxid = 0; 2216 break; 2217 } 2218 if (++jid > maxid) { 2219 if (lastprid == maxid || lastprid == 0) 2220 { 2221 /* 2222 * The entire legal range 2223 * has been traversed 2224 */ 2225 return 0; 2226 } 2227 /* Try again from the start. */ 2228 jid = 1; 2229 maxid = lastprid; 2230 break; 2231 } 2232 } 2233 if (inspr == NULL) { 2234 /* Found room at the end of the list. */ 2235 break; 2236 } 2237 } 2238 } 2239 *insprp = inspr; 2240 lastprid = jid; 2241 return (jid); 2242 } 2243 2244 /* 2245 * Find the next available ID for a renumbered dead prison. This is the same 2246 * as get_next_prid, but counting backward from the end of the range. 2247 */ 2248 static int 2249 get_next_deadid(struct prison **dinsprp) 2250 { 2251 struct prison *dinspr; 2252 int deadid, minid; 2253 2254 deadid = lastdeadid ? lastdeadid - 1 : JAIL_MAX; 2255 /* 2256 * Take two reverse passes through the allprison list: first 2257 * starting with the proposed deadid, then ending with it. 2258 */ 2259 for (minid = 1; minid != 0; ) { 2260 TAILQ_FOREACH_REVERSE(dinspr, &allprison, prisonlist, pr_list) { 2261 if (dinspr->pr_id > deadid) 2262 continue; 2263 if (dinspr->pr_id < deadid) { 2264 /* Found an opening. */ 2265 minid = 0; 2266 break; 2267 } 2268 if (--deadid < minid) { 2269 if (lastdeadid == minid || lastdeadid == 0) 2270 { 2271 /* 2272 * The entire legal range 2273 * has been traversed 2274 */ 2275 return 0; 2276 } 2277 /* Try again from the end. */ 2278 deadid = JAIL_MAX; 2279 minid = lastdeadid; 2280 break; 2281 } 2282 } 2283 if (dinspr == NULL) { 2284 /* Found room at the beginning of the list. */ 2285 break; 2286 } 2287 } 2288 *dinsprp = dinspr; 2289 lastdeadid = deadid; 2290 return (deadid); 2291 } 2292 2293 /* 2294 * struct jail_get_args { 2295 * struct iovec *iovp; 2296 * unsigned int iovcnt; 2297 * int flags; 2298 * }; 2299 */ 2300 int 2301 sys_jail_get(struct thread *td, struct jail_get_args *uap) 2302 { 2303 struct uio *auio; 2304 int error; 2305 2306 /* Check that we have an even number of iovecs. */ 2307 if (uap->iovcnt & 1) 2308 return (EINVAL); 2309 2310 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 2311 if (error) 2312 return (error); 2313 error = kern_jail_get(td, auio, uap->flags); 2314 if (error == 0) 2315 error = copyout(auio->uio_iov, uap->iovp, 2316 uap->iovcnt * sizeof(struct iovec)); 2317 freeuio(auio); 2318 return (error); 2319 } 2320 2321 int 2322 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 2323 { 2324 struct bool_flags *bf; 2325 struct jailsys_flags *jsf; 2326 struct prison *pr, *mypr; 2327 struct vfsopt *opt; 2328 struct vfsoptlist *opts; 2329 char *errmsg, *name; 2330 int drflags, error, errmsg_len, errmsg_pos, i, jid, len, pos; 2331 unsigned f; 2332 2333 if (flags & ~JAIL_GET_MASK) 2334 return (EINVAL); 2335 2336 /* Get the parameter list. */ 2337 error = vfs_buildopts(optuio, &opts); 2338 if (error) 2339 return (error); 2340 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 2341 mypr = td->td_ucred->cr_prison; 2342 pr = NULL; 2343 2344 /* 2345 * Find the prison specified by one of: lastjid, jid, name. 2346 */ 2347 sx_slock(&allprison_lock); 2348 drflags = PD_LIST_SLOCKED; 2349 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 2350 if (error == 0) { 2351 TAILQ_FOREACH(pr, &allprison, pr_list) { 2352 if (pr->pr_id > jid && 2353 ((flags & JAIL_DYING) || prison_isalive(pr)) && 2354 prison_ischild(mypr, pr)) { 2355 mtx_lock(&pr->pr_mtx); 2356 drflags |= PD_LOCKED; 2357 goto found_prison; 2358 } 2359 } 2360 error = ENOENT; 2361 vfs_opterror(opts, "no jail after %d", jid); 2362 goto done; 2363 } else if (error != ENOENT) 2364 goto done; 2365 2366 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 2367 if (error == 0) { 2368 if (jid != 0) { 2369 pr = prison_find_child(mypr, jid); 2370 if (pr != NULL) { 2371 drflags |= PD_LOCKED; 2372 if (!(prison_isalive(pr) || 2373 (flags & JAIL_DYING))) { 2374 error = ENOENT; 2375 vfs_opterror(opts, "jail %d is dying", 2376 jid); 2377 goto done; 2378 } 2379 goto found_prison; 2380 } 2381 error = ENOENT; 2382 vfs_opterror(opts, "jail %d not found", jid); 2383 goto done; 2384 } 2385 } else if (error != ENOENT) 2386 goto done; 2387 2388 error = vfs_getopt(opts, "name", (void **)&name, &len); 2389 if (error == 0) { 2390 if (len == 0 || name[len - 1] != '\0') { 2391 error = EINVAL; 2392 goto done; 2393 } 2394 pr = prison_find_name(mypr, name); 2395 if (pr != NULL) { 2396 drflags |= PD_LOCKED; 2397 if (!(prison_isalive(pr) || (flags & JAIL_DYING))) { 2398 error = ENOENT; 2399 vfs_opterror(opts, "jail \"%s\" is dying", 2400 name); 2401 goto done; 2402 } 2403 goto found_prison; 2404 } 2405 error = ENOENT; 2406 vfs_opterror(opts, "jail \"%s\" not found", name); 2407 goto done; 2408 } else if (error != ENOENT) 2409 goto done; 2410 2411 vfs_opterror(opts, "no jail specified"); 2412 error = ENOENT; 2413 goto done; 2414 2415 found_prison: 2416 /* Get the parameters of the prison. */ 2417 prison_hold(pr); 2418 drflags |= PD_DEREF; 2419 td->td_retval[0] = pr->pr_id; 2420 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2421 if (error != 0 && error != ENOENT) 2422 goto done; 2423 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2424 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2425 if (error != 0 && error != ENOENT) 2426 goto done; 2427 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2428 if (error != 0 && error != ENOENT) 2429 goto done; 2430 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2431 sizeof(pr->pr_cpuset->cs_id)); 2432 if (error != 0 && error != ENOENT) 2433 goto done; 2434 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2435 if (error != 0 && error != ENOENT) 2436 goto done; 2437 #ifdef INET 2438 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_addrs[PR_INET]->pr_ip, 2439 pr->pr_addrs[PR_INET] ? pr->pr_addrs[PR_INET]->ips * 2440 pr_families[PR_INET].size : 0 ); 2441 if (error != 0 && error != ENOENT) 2442 goto done; 2443 #endif 2444 #ifdef INET6 2445 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_addrs[PR_INET6]->pr_ip, 2446 pr->pr_addrs[PR_INET6] ? pr->pr_addrs[PR_INET6]->ips * 2447 pr_families[PR_INET6].size : 0 ); 2448 if (error != 0 && error != ENOENT) 2449 goto done; 2450 #endif 2451 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2452 sizeof(pr->pr_securelevel)); 2453 if (error != 0 && error != ENOENT) 2454 goto done; 2455 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2456 sizeof(pr->pr_childcount)); 2457 if (error != 0 && error != ENOENT) 2458 goto done; 2459 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2460 sizeof(pr->pr_childmax)); 2461 if (error != 0 && error != ENOENT) 2462 goto done; 2463 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2464 if (error != 0 && error != ENOENT) 2465 goto done; 2466 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2467 if (error != 0 && error != ENOENT) 2468 goto done; 2469 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2470 if (error != 0 && error != ENOENT) 2471 goto done; 2472 #ifdef COMPAT_FREEBSD32 2473 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2474 uint32_t hid32 = pr->pr_hostid; 2475 2476 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2477 } else 2478 #endif 2479 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2480 sizeof(pr->pr_hostid)); 2481 if (error != 0 && error != ENOENT) 2482 goto done; 2483 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2484 sizeof(pr->pr_enforce_statfs)); 2485 if (error != 0 && error != ENOENT) 2486 goto done; 2487 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2488 sizeof(pr->pr_devfs_rsnum)); 2489 if (error != 0 && error != ENOENT) 2490 goto done; 2491 for (bf = pr_flag_bool; 2492 bf < pr_flag_bool + nitems(pr_flag_bool); 2493 bf++) { 2494 i = (pr->pr_flags & bf->flag) ? 1 : 0; 2495 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2496 if (error != 0 && error != ENOENT) 2497 goto done; 2498 i = !i; 2499 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2500 if (error != 0 && error != ENOENT) 2501 goto done; 2502 } 2503 for (jsf = pr_flag_jailsys; 2504 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 2505 jsf++) { 2506 f = pr->pr_flags & (jsf->disable | jsf->new); 2507 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE 2508 : (f == jsf->new) ? JAIL_SYS_NEW 2509 : JAIL_SYS_INHERIT; 2510 error = vfs_setopt(opts, jsf->name, &i, sizeof(i)); 2511 if (error != 0 && error != ENOENT) 2512 goto done; 2513 } 2514 for (bf = pr_flag_allow; 2515 bf < pr_flag_allow + nitems(pr_flag_allow) && 2516 atomic_load_int(&bf->flag) != 0; 2517 bf++) { 2518 i = (pr->pr_allow & bf->flag) ? 1 : 0; 2519 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2520 if (error != 0 && error != ENOENT) 2521 goto done; 2522 i = !i; 2523 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2524 if (error != 0 && error != ENOENT) 2525 goto done; 2526 } 2527 i = !prison_isalive(pr); 2528 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2529 if (error != 0 && error != ENOENT) 2530 goto done; 2531 i = !i; 2532 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2533 if (error != 0 && error != ENOENT) 2534 goto done; 2535 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2536 sizeof(pr->pr_osreldate)); 2537 if (error != 0 && error != ENOENT) 2538 goto done; 2539 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2540 if (error != 0 && error != ENOENT) 2541 goto done; 2542 2543 /* Get the module parameters. */ 2544 mtx_unlock(&pr->pr_mtx); 2545 drflags &= ~PD_LOCKED; 2546 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2547 if (error) 2548 goto done; 2549 prison_deref(pr, drflags); 2550 pr = NULL; 2551 drflags = 0; 2552 2553 /* By now, all parameters should have been noted. */ 2554 TAILQ_FOREACH(opt, opts, link) { 2555 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2556 error = EINVAL; 2557 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2558 goto done; 2559 } 2560 } 2561 2562 /* Write the fetched parameters back to userspace. */ 2563 error = 0; 2564 TAILQ_FOREACH(opt, opts, link) { 2565 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2566 pos = 2 * opt->pos + 1; 2567 optuio->uio_iov[pos].iov_len = opt->len; 2568 if (opt->value != NULL) { 2569 if (optuio->uio_segflg == UIO_SYSSPACE) { 2570 bcopy(opt->value, 2571 optuio->uio_iov[pos].iov_base, 2572 opt->len); 2573 } else { 2574 error = copyout(opt->value, 2575 optuio->uio_iov[pos].iov_base, 2576 opt->len); 2577 if (error) 2578 break; 2579 } 2580 } 2581 } 2582 } 2583 2584 done: 2585 /* Release any temporary prison holds and/or locks. */ 2586 if (pr != NULL) 2587 prison_deref(pr, drflags); 2588 else if (drflags & PD_LIST_SLOCKED) 2589 sx_sunlock(&allprison_lock); 2590 if (error && errmsg_pos >= 0) { 2591 /* Write the error message back to userspace. */ 2592 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2593 errmsg_pos = 2 * errmsg_pos + 1; 2594 if (errmsg_len > 0) { 2595 if (optuio->uio_segflg == UIO_SYSSPACE) 2596 bcopy(errmsg, 2597 optuio->uio_iov[errmsg_pos].iov_base, 2598 errmsg_len); 2599 else 2600 (void)copyout(errmsg, 2601 optuio->uio_iov[errmsg_pos].iov_base, 2602 errmsg_len); 2603 } 2604 } 2605 vfs_freeopts(opts); 2606 return (error); 2607 } 2608 2609 /* 2610 * struct jail_remove_args { 2611 * int jid; 2612 * }; 2613 */ 2614 int 2615 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2616 { 2617 struct prison *pr; 2618 int error; 2619 2620 error = priv_check(td, PRIV_JAIL_REMOVE); 2621 if (error) 2622 return (error); 2623 2624 sx_xlock(&allprison_lock); 2625 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2626 if (pr == NULL) { 2627 sx_xunlock(&allprison_lock); 2628 return (EINVAL); 2629 } 2630 if (!prison_isalive(pr)) { 2631 /* Silently ignore already-dying prisons. */ 2632 mtx_unlock(&pr->pr_mtx); 2633 sx_xunlock(&allprison_lock); 2634 return (0); 2635 } 2636 prison_deref(pr, PD_KILL | PD_LOCKED | PD_LIST_XLOCKED); 2637 return (0); 2638 } 2639 2640 /* 2641 * struct jail_attach_args { 2642 * int jid; 2643 * }; 2644 */ 2645 int 2646 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2647 { 2648 struct prison *pr; 2649 int error; 2650 2651 error = priv_check(td, PRIV_JAIL_ATTACH); 2652 if (error) 2653 return (error); 2654 2655 sx_slock(&allprison_lock); 2656 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2657 if (pr == NULL) { 2658 sx_sunlock(&allprison_lock); 2659 return (EINVAL); 2660 } 2661 2662 /* Do not allow a process to attach to a prison that is not alive. */ 2663 if (!prison_isalive(pr)) { 2664 mtx_unlock(&pr->pr_mtx); 2665 sx_sunlock(&allprison_lock); 2666 return (EINVAL); 2667 } 2668 2669 return (do_jail_attach(td, pr, PD_LOCKED | PD_LIST_SLOCKED)); 2670 } 2671 2672 static int 2673 do_jail_attach(struct thread *td, struct prison *pr, int drflags) 2674 { 2675 struct proc *p; 2676 struct ucred *newcred, *oldcred; 2677 int error; 2678 2679 mtx_assert(&pr->pr_mtx, MA_OWNED); 2680 sx_assert(&allprison_lock, SX_LOCKED); 2681 drflags &= PD_LOCK_FLAGS; 2682 /* 2683 * XXX: Note that there is a slight race here if two threads 2684 * in the same privileged process attempt to attach to two 2685 * different jails at the same time. It is important for 2686 * user processes not to do this, or they might end up with 2687 * a process root from one prison, but attached to the jail 2688 * of another. 2689 */ 2690 prison_hold(pr); 2691 refcount_acquire(&pr->pr_uref); 2692 drflags |= PD_DEREF | PD_DEUREF; 2693 mtx_unlock(&pr->pr_mtx); 2694 drflags &= ~PD_LOCKED; 2695 2696 /* Let modules do whatever they need to prepare for attaching. */ 2697 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2698 if (error) { 2699 prison_deref(pr, drflags); 2700 return (error); 2701 } 2702 sx_unlock(&allprison_lock); 2703 drflags &= ~(PD_LIST_SLOCKED | PD_LIST_XLOCKED); 2704 2705 /* 2706 * Reparent the newly attached process to this jail. 2707 */ 2708 p = td->td_proc; 2709 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2710 if (error) 2711 goto e_revert_osd; 2712 2713 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2714 if ((error = change_dir(pr->pr_root, td)) != 0) 2715 goto e_unlock; 2716 #ifdef MAC 2717 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2718 goto e_unlock; 2719 #endif 2720 VOP_UNLOCK(pr->pr_root); 2721 if ((error = pwd_chroot_chdir(td, pr->pr_root))) 2722 goto e_revert_osd; 2723 2724 newcred = crget(); 2725 PROC_LOCK(p); 2726 oldcred = crcopysafe(p, newcred); 2727 newcred->cr_prison = pr; 2728 proc_set_cred(p, newcred); 2729 setsugid(p); 2730 #ifdef RACCT 2731 racct_proc_ucred_changed(p, oldcred, newcred); 2732 crhold(newcred); 2733 #endif 2734 PROC_UNLOCK(p); 2735 #ifdef RCTL 2736 rctl_proc_ucred_changed(p, newcred); 2737 crfree(newcred); 2738 #endif 2739 prison_proc_relink(oldcred->cr_prison, pr, p); 2740 prison_deref(oldcred->cr_prison, drflags); 2741 crfree(oldcred); 2742 2743 /* 2744 * If the prison was killed while changing credentials, die along 2745 * with it. 2746 */ 2747 if (!prison_isalive(pr)) { 2748 PROC_LOCK(p); 2749 kern_psignal(p, SIGKILL); 2750 PROC_UNLOCK(p); 2751 } 2752 2753 return (0); 2754 2755 e_unlock: 2756 VOP_UNLOCK(pr->pr_root); 2757 e_revert_osd: 2758 /* Tell modules this thread is still in its old jail after all. */ 2759 sx_slock(&allprison_lock); 2760 drflags |= PD_LIST_SLOCKED; 2761 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2762 prison_deref(pr, drflags); 2763 return (error); 2764 } 2765 2766 /* 2767 * Returns a locked prison instance, or NULL on failure. 2768 */ 2769 struct prison * 2770 prison_find(int prid) 2771 { 2772 struct prison *pr; 2773 2774 sx_assert(&allprison_lock, SX_LOCKED); 2775 TAILQ_FOREACH(pr, &allprison, pr_list) { 2776 if (pr->pr_id < prid) 2777 continue; 2778 if (pr->pr_id > prid) 2779 break; 2780 KASSERT(prison_isvalid(pr), ("Found invalid prison %p", pr)); 2781 mtx_lock(&pr->pr_mtx); 2782 return (pr); 2783 } 2784 return (NULL); 2785 } 2786 2787 /* 2788 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2789 */ 2790 struct prison * 2791 prison_find_child(struct prison *mypr, int prid) 2792 { 2793 struct prison *pr; 2794 int descend; 2795 2796 sx_assert(&allprison_lock, SX_LOCKED); 2797 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2798 if (pr->pr_id == prid) { 2799 KASSERT(prison_isvalid(pr), 2800 ("Found invalid prison %p", pr)); 2801 mtx_lock(&pr->pr_mtx); 2802 return (pr); 2803 } 2804 } 2805 return (NULL); 2806 } 2807 2808 /* 2809 * Look for the name relative to mypr. Returns a locked prison or NULL. 2810 */ 2811 struct prison * 2812 prison_find_name(struct prison *mypr, const char *name) 2813 { 2814 struct prison *pr, *deadpr; 2815 size_t mylen; 2816 int descend; 2817 2818 sx_assert(&allprison_lock, SX_LOCKED); 2819 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2820 deadpr = NULL; 2821 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2822 if (!strcmp(pr->pr_name + mylen, name)) { 2823 KASSERT(prison_isvalid(pr), 2824 ("Found invalid prison %p", pr)); 2825 if (prison_isalive(pr)) { 2826 mtx_lock(&pr->pr_mtx); 2827 return (pr); 2828 } 2829 deadpr = pr; 2830 } 2831 } 2832 /* There was no valid prison - perhaps there was a dying one. */ 2833 if (deadpr != NULL) 2834 mtx_lock(&deadpr->pr_mtx); 2835 return (deadpr); 2836 } 2837 2838 /* 2839 * See if a prison has the specific flag set. The prison should be locked, 2840 * unless checking for flags that are only set at jail creation (such as 2841 * PR_IP4 and PR_IP6), or only the single bit is examined, without regard 2842 * to any other prison data. 2843 */ 2844 bool 2845 prison_flag(struct ucred *cred, unsigned flag) 2846 { 2847 2848 return ((cred->cr_prison->pr_flags & flag) != 0); 2849 } 2850 2851 /* 2852 * See if a prison has the specific allow flag set. 2853 * The prison *should* be locked, or only a single bit is examined, without 2854 * regard to any other prison data. 2855 */ 2856 bool 2857 prison_allow(struct ucred *cred, unsigned flag) 2858 { 2859 2860 return ((cred->cr_prison->pr_allow & flag) != 0); 2861 } 2862 2863 /* 2864 * Hold a prison reference, by incrementing pr_ref. It is generally 2865 * an error to hold a prison that does not already have a reference. 2866 * A prison record will remain valid as long as it has at least one 2867 * reference, and will not be removed as long as either the prison 2868 * mutex or the allprison lock is held (allprison_lock may be shared). 2869 */ 2870 void 2871 prison_hold_locked(struct prison *pr) 2872 { 2873 2874 /* Locking is no longer required. */ 2875 prison_hold(pr); 2876 } 2877 2878 void 2879 prison_hold(struct prison *pr) 2880 { 2881 #ifdef INVARIANTS 2882 int was_valid = refcount_acquire_if_not_zero(&pr->pr_ref); 2883 2884 KASSERT(was_valid, 2885 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id)); 2886 #else 2887 refcount_acquire(&pr->pr_ref); 2888 #endif 2889 } 2890 2891 /* 2892 * Remove a prison reference. If that was the last reference, the 2893 * prison will be removed (at a later time). 2894 */ 2895 void 2896 prison_free_locked(struct prison *pr) 2897 { 2898 2899 mtx_assert(&pr->pr_mtx, MA_OWNED); 2900 /* 2901 * Locking is no longer required, but unlock because the caller 2902 * expects it. 2903 */ 2904 mtx_unlock(&pr->pr_mtx); 2905 prison_free(pr); 2906 } 2907 2908 void 2909 prison_free(struct prison *pr) 2910 { 2911 2912 KASSERT(refcount_load(&pr->pr_ref) > 0, 2913 ("Trying to free dead prison %p (jid=%d).", 2914 pr, pr->pr_id)); 2915 if (!refcount_release_if_not_last(&pr->pr_ref)) { 2916 /* 2917 * Don't remove the last reference in this context, 2918 * in case there are locks held. 2919 */ 2920 taskqueue_enqueue(taskqueue_jail_remove, &pr->pr_task); 2921 } 2922 } 2923 2924 static void 2925 prison_free_not_last(struct prison *pr) 2926 { 2927 #ifdef INVARIANTS 2928 int lastref; 2929 2930 KASSERT(refcount_load(&pr->pr_ref) > 0, 2931 ("Trying to free dead prison %p (jid=%d).", 2932 pr, pr->pr_id)); 2933 lastref = refcount_release(&pr->pr_ref); 2934 KASSERT(!lastref, 2935 ("prison_free_not_last freed last ref on prison %p (jid=%d).", 2936 pr, pr->pr_id)); 2937 #else 2938 refcount_release(&pr->pr_ref); 2939 #endif 2940 } 2941 2942 /* 2943 * Hold a prison for user visibility, by incrementing pr_uref. 2944 * It is generally an error to hold a prison that isn't already 2945 * user-visible, except through the jail system calls. It is also 2946 * an error to hold an invalid prison. A prison record will remain 2947 * alive as long as it has at least one user reference, and will not 2948 * be set to the dying state until the prison mutex and allprison_lock 2949 * are both freed. 2950 */ 2951 void 2952 prison_proc_hold(struct prison *pr) 2953 { 2954 #ifdef INVARIANTS 2955 int was_alive = refcount_acquire_if_not_zero(&pr->pr_uref); 2956 2957 KASSERT(was_alive, 2958 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2959 #else 2960 refcount_acquire(&pr->pr_uref); 2961 #endif 2962 } 2963 2964 /* 2965 * Remove a prison user reference. If it was the last reference, the 2966 * prison will be considered "dying", and may be removed once all of 2967 * its references are dropped. 2968 */ 2969 void 2970 prison_proc_free(struct prison *pr) 2971 { 2972 2973 /* 2974 * Locking is only required when releasing the last reference. 2975 * This allows assurance that a locked prison will remain alive 2976 * until it is unlocked. 2977 */ 2978 KASSERT(refcount_load(&pr->pr_uref) > 0, 2979 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2980 if (!refcount_release_if_not_last(&pr->pr_uref)) { 2981 /* 2982 * Don't remove the last user reference in this context, 2983 * which is expected to be a process that is not only locked, 2984 * but also half dead. Add a reference so any calls to 2985 * prison_free() won't re-submit the task. 2986 */ 2987 prison_hold(pr); 2988 mtx_lock(&pr->pr_mtx); 2989 KASSERT(!(pr->pr_flags & PR_COMPLETE_PROC), 2990 ("Redundant last reference in prison_proc_free (jid=%d)", 2991 pr->pr_id)); 2992 pr->pr_flags |= PR_COMPLETE_PROC; 2993 mtx_unlock(&pr->pr_mtx); 2994 taskqueue_enqueue(taskqueue_jail_remove, &pr->pr_task); 2995 } 2996 } 2997 2998 static void 2999 prison_proc_free_not_last(struct prison *pr) 3000 { 3001 #ifdef INVARIANTS 3002 int lastref; 3003 3004 KASSERT(refcount_load(&pr->pr_uref) > 0, 3005 ("Trying to free dead prison %p (jid=%d).", 3006 pr, pr->pr_id)); 3007 lastref = refcount_release(&pr->pr_uref); 3008 KASSERT(!lastref, 3009 ("prison_proc_free_not_last freed last uref on prison %p (jid=%d).", 3010 pr, pr->pr_id)); 3011 #else 3012 refcount_release(&pr->pr_uref); 3013 #endif 3014 } 3015 3016 void 3017 prison_proc_link(struct prison *pr, struct proc *p) 3018 { 3019 3020 sx_assert(&allproc_lock, SA_XLOCKED); 3021 LIST_INSERT_HEAD(&pr->pr_proclist, p, p_jaillist); 3022 } 3023 3024 void 3025 prison_proc_unlink(struct prison *pr, struct proc *p) 3026 { 3027 3028 sx_assert(&allproc_lock, SA_XLOCKED); 3029 LIST_REMOVE(p, p_jaillist); 3030 } 3031 3032 static void 3033 prison_proc_relink(struct prison *opr, struct prison *npr, struct proc *p) 3034 { 3035 3036 sx_xlock(&allproc_lock); 3037 prison_proc_unlink(opr, p); 3038 prison_proc_link(npr, p); 3039 sx_xunlock(&allproc_lock); 3040 } 3041 3042 /* 3043 * Complete a call to either prison_free or prison_proc_free. 3044 */ 3045 static void 3046 prison_complete(void *context, int pending) 3047 { 3048 struct prison *pr = context; 3049 int drflags; 3050 3051 /* 3052 * This could be called to release the last reference, or the last 3053 * user reference (plus the reference held in prison_proc_free). 3054 */ 3055 drflags = prison_lock_xlock(pr, PD_DEREF); 3056 if (pr->pr_flags & PR_COMPLETE_PROC) { 3057 pr->pr_flags &= ~PR_COMPLETE_PROC; 3058 drflags |= PD_DEUREF; 3059 } 3060 prison_deref(pr, drflags); 3061 } 3062 3063 static void 3064 prison_kill_processes_cb(struct proc *p, void *arg __unused) 3065 { 3066 3067 kern_psignal(p, SIGKILL); 3068 } 3069 3070 /* 3071 * Note the iteration does not guarantee acting on all processes. 3072 * Most notably there may be fork or jail_attach in progress. 3073 */ 3074 void 3075 prison_proc_iterate(struct prison *pr, void (*cb)(struct proc *, void *), 3076 void *cbarg) 3077 { 3078 struct prison *ppr; 3079 struct proc *p; 3080 3081 if (atomic_load_int(&pr->pr_childcount) == 0) { 3082 sx_slock(&allproc_lock); 3083 LIST_FOREACH(p, &pr->pr_proclist, p_jaillist) { 3084 if (p->p_state == PRS_NEW) 3085 continue; 3086 PROC_LOCK(p); 3087 cb(p, cbarg); 3088 PROC_UNLOCK(p); 3089 } 3090 sx_sunlock(&allproc_lock); 3091 if (atomic_load_int(&pr->pr_childcount) == 0) 3092 return; 3093 /* 3094 * Some jails popped up during the iteration, fall through to a 3095 * system-wide search. 3096 */ 3097 } 3098 3099 sx_slock(&allproc_lock); 3100 FOREACH_PROC_IN_SYSTEM(p) { 3101 PROC_LOCK(p); 3102 if (p->p_state != PRS_NEW && p->p_ucred != NULL) { 3103 for (ppr = p->p_ucred->cr_prison; ppr != NULL; 3104 ppr = ppr->pr_parent) { 3105 if (ppr == pr) { 3106 cb(p, cbarg); 3107 break; 3108 } 3109 } 3110 } 3111 PROC_UNLOCK(p); 3112 } 3113 sx_sunlock(&allproc_lock); 3114 } 3115 3116 /* 3117 * Remove a prison reference and/or user reference (usually). 3118 * This assumes context that allows sleeping (for allprison_lock), 3119 * with no non-sleeping locks held, except perhaps the prison itself. 3120 * If there are no more references, release and delist the prison. 3121 * On completion, the prison lock and the allprison lock are both 3122 * unlocked. 3123 */ 3124 static void 3125 prison_deref(struct prison *pr, int flags) 3126 { 3127 struct prisonlist freeprison; 3128 struct prison *killpr, *rpr, *ppr, *tpr; 3129 3130 killpr = NULL; 3131 TAILQ_INIT(&freeprison); 3132 /* 3133 * Release this prison as requested, which may cause its parent 3134 * to be released, and then maybe its grandparent, etc. 3135 */ 3136 for (;;) { 3137 if (flags & PD_KILL) { 3138 /* Kill the prison and its descendents. */ 3139 KASSERT(pr != &prison0, 3140 ("prison_deref trying to kill prison0")); 3141 if (!(flags & PD_DEREF)) { 3142 prison_hold(pr); 3143 flags |= PD_DEREF; 3144 } 3145 flags = prison_lock_xlock(pr, flags); 3146 prison_deref_kill(pr, &freeprison); 3147 } 3148 if (flags & PD_DEUREF) { 3149 /* Drop a user reference. */ 3150 KASSERT(refcount_load(&pr->pr_uref) > 0, 3151 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 3152 pr->pr_id)); 3153 if (!refcount_release_if_not_last(&pr->pr_uref)) { 3154 if (!(flags & PD_DEREF)) { 3155 prison_hold(pr); 3156 flags |= PD_DEREF; 3157 } 3158 flags = prison_lock_xlock(pr, flags); 3159 if (refcount_release(&pr->pr_uref) && 3160 pr->pr_state == PRISON_STATE_ALIVE) { 3161 /* 3162 * When the last user references goes, 3163 * this becomes a dying prison. 3164 */ 3165 KASSERT( 3166 refcount_load(&prison0.pr_uref) > 0, 3167 ("prison0 pr_uref=0")); 3168 pr->pr_state = PRISON_STATE_DYING; 3169 mtx_unlock(&pr->pr_mtx); 3170 flags &= ~PD_LOCKED; 3171 prison_cleanup(pr); 3172 } 3173 } 3174 } 3175 if (flags & PD_KILL) { 3176 /* 3177 * Any remaining user references are probably processes 3178 * that need to be killed, either in this prison or its 3179 * descendants. 3180 */ 3181 if (refcount_load(&pr->pr_uref) > 0) 3182 killpr = pr; 3183 /* Make sure the parent prison doesn't get killed. */ 3184 flags &= ~PD_KILL; 3185 } 3186 if (flags & PD_DEREF) { 3187 /* Drop a reference. */ 3188 KASSERT(refcount_load(&pr->pr_ref) > 0, 3189 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 3190 pr->pr_id)); 3191 if (!refcount_release_if_not_last(&pr->pr_ref)) { 3192 flags = prison_lock_xlock(pr, flags); 3193 if (refcount_release(&pr->pr_ref)) { 3194 /* 3195 * When the last reference goes, 3196 * unlink the prison and set it aside. 3197 */ 3198 KASSERT( 3199 refcount_load(&pr->pr_uref) == 0, 3200 ("prison_deref: last ref, " 3201 "but still has %d urefs (jid=%d)", 3202 pr->pr_uref, pr->pr_id)); 3203 KASSERT( 3204 refcount_load(&prison0.pr_ref) != 0, 3205 ("prison0 pr_ref=0")); 3206 pr->pr_state = PRISON_STATE_INVALID; 3207 TAILQ_REMOVE(&allprison, pr, pr_list); 3208 LIST_REMOVE(pr, pr_sibling); 3209 TAILQ_INSERT_TAIL(&freeprison, pr, 3210 pr_list); 3211 for (ppr = pr->pr_parent; 3212 ppr != NULL; 3213 ppr = ppr->pr_parent) 3214 ppr->pr_childcount--; 3215 /* 3216 * Removing a prison frees references 3217 * from its parent. 3218 */ 3219 ppr = pr->pr_parent; 3220 pr->pr_parent = NULL; 3221 mtx_unlock(&pr->pr_mtx); 3222 3223 pr = ppr; 3224 flags &= ~PD_LOCKED; 3225 flags |= PD_DEREF | PD_DEUREF; 3226 continue; 3227 } 3228 } 3229 } 3230 break; 3231 } 3232 3233 /* Release all the prison locks. */ 3234 if (flags & PD_LOCKED) 3235 mtx_unlock(&pr->pr_mtx); 3236 if (flags & PD_LIST_SLOCKED) 3237 sx_sunlock(&allprison_lock); 3238 else if (flags & PD_LIST_XLOCKED) 3239 sx_xunlock(&allprison_lock); 3240 3241 /* Kill any processes attached to a killed prison. */ 3242 if (killpr != NULL) 3243 prison_proc_iterate(killpr, prison_kill_processes_cb, NULL); 3244 3245 /* 3246 * Finish removing any unreferenced prisons, which couldn't happen 3247 * while allprison_lock was held (to avoid a LOR on vrele). 3248 */ 3249 TAILQ_FOREACH_SAFE(rpr, &freeprison, pr_list, tpr) { 3250 #ifdef VIMAGE 3251 if (rpr->pr_flags & PR_VNET) 3252 vnet_destroy(rpr->pr_vnet); 3253 #endif 3254 if (rpr->pr_root != NULL) 3255 vrele(rpr->pr_root); 3256 mtx_destroy(&rpr->pr_mtx); 3257 #ifdef INET 3258 prison_ip_free(rpr->pr_addrs[PR_INET]); 3259 #endif 3260 #ifdef INET6 3261 prison_ip_free(rpr->pr_addrs[PR_INET6]); 3262 #endif 3263 if (rpr->pr_cpuset != NULL) 3264 cpuset_rel(rpr->pr_cpuset); 3265 osd_jail_exit(rpr); 3266 #ifdef RACCT 3267 if (racct_enable) 3268 prison_racct_detach(rpr); 3269 #endif 3270 TAILQ_REMOVE(&freeprison, rpr, pr_list); 3271 free(rpr, M_PRISON); 3272 } 3273 } 3274 3275 /* 3276 * Kill the prison and its descendants. Mark them as dying, clear the 3277 * persist flag, and call module remove methods. 3278 */ 3279 static void 3280 prison_deref_kill(struct prison *pr, struct prisonlist *freeprison) 3281 { 3282 struct prison *cpr, *ppr, *rpr; 3283 bool descend; 3284 3285 /* 3286 * Unlike the descendants, the target prison can be killed 3287 * even if it is currently dying. This is useful for failed 3288 * creation in jail_set(2). 3289 */ 3290 KASSERT(refcount_load(&pr->pr_ref) > 0, 3291 ("Trying to kill dead prison %p (jid=%d).", 3292 pr, pr->pr_id)); 3293 refcount_acquire(&pr->pr_uref); 3294 pr->pr_state = PRISON_STATE_DYING; 3295 mtx_unlock(&pr->pr_mtx); 3296 3297 rpr = NULL; 3298 FOREACH_PRISON_DESCENDANT_PRE_POST(pr, cpr, descend) { 3299 if (descend) { 3300 if (!prison_isalive(cpr)) { 3301 descend = false; 3302 continue; 3303 } 3304 prison_hold(cpr); 3305 prison_proc_hold(cpr); 3306 mtx_lock(&cpr->pr_mtx); 3307 cpr->pr_state = PRISON_STATE_DYING; 3308 cpr->pr_flags |= PR_REMOVE; 3309 mtx_unlock(&cpr->pr_mtx); 3310 continue; 3311 } 3312 if (!(cpr->pr_flags & PR_REMOVE)) 3313 continue; 3314 prison_cleanup(cpr); 3315 mtx_lock(&cpr->pr_mtx); 3316 cpr->pr_flags &= ~PR_REMOVE; 3317 if (cpr->pr_flags & PR_PERSIST) { 3318 cpr->pr_flags &= ~PR_PERSIST; 3319 prison_proc_free_not_last(cpr); 3320 prison_free_not_last(cpr); 3321 } 3322 (void)refcount_release(&cpr->pr_uref); 3323 if (refcount_release(&cpr->pr_ref)) { 3324 /* 3325 * When the last reference goes, unlink the prison 3326 * and set it aside for prison_deref() to handle. 3327 * Delay unlinking the sibling list to keep the loop 3328 * safe. 3329 */ 3330 if (rpr != NULL) 3331 LIST_REMOVE(rpr, pr_sibling); 3332 rpr = cpr; 3333 rpr->pr_state = PRISON_STATE_INVALID; 3334 TAILQ_REMOVE(&allprison, rpr, pr_list); 3335 TAILQ_INSERT_TAIL(freeprison, rpr, pr_list); 3336 /* 3337 * Removing a prison frees references from its parent. 3338 */ 3339 ppr = rpr->pr_parent; 3340 prison_proc_free_not_last(ppr); 3341 prison_free_not_last(ppr); 3342 for (; ppr != NULL; ppr = ppr->pr_parent) 3343 ppr->pr_childcount--; 3344 } 3345 mtx_unlock(&cpr->pr_mtx); 3346 } 3347 if (rpr != NULL) 3348 LIST_REMOVE(rpr, pr_sibling); 3349 3350 prison_cleanup(pr); 3351 mtx_lock(&pr->pr_mtx); 3352 if (pr->pr_flags & PR_PERSIST) { 3353 pr->pr_flags &= ~PR_PERSIST; 3354 prison_proc_free_not_last(pr); 3355 prison_free_not_last(pr); 3356 } 3357 (void)refcount_release(&pr->pr_uref); 3358 } 3359 3360 /* 3361 * Given the current locking state in the flags, make sure allprison_lock 3362 * is held exclusive, and the prison is locked. Return flags indicating 3363 * the new state. 3364 */ 3365 static int 3366 prison_lock_xlock(struct prison *pr, int flags) 3367 { 3368 3369 if (!(flags & PD_LIST_XLOCKED)) { 3370 /* 3371 * Get allprison_lock, which may be an upgrade, 3372 * and may require unlocking the prison. 3373 */ 3374 if (flags & PD_LOCKED) { 3375 mtx_unlock(&pr->pr_mtx); 3376 flags &= ~PD_LOCKED; 3377 } 3378 if (flags & PD_LIST_SLOCKED) { 3379 if (!sx_try_upgrade(&allprison_lock)) { 3380 sx_sunlock(&allprison_lock); 3381 sx_xlock(&allprison_lock); 3382 } 3383 flags &= ~PD_LIST_SLOCKED; 3384 } else 3385 sx_xlock(&allprison_lock); 3386 flags |= PD_LIST_XLOCKED; 3387 } 3388 if (!(flags & PD_LOCKED)) { 3389 /* Lock the prison mutex. */ 3390 mtx_lock(&pr->pr_mtx); 3391 flags |= PD_LOCKED; 3392 } 3393 return flags; 3394 } 3395 3396 /* 3397 * Release a prison's resources when it starts dying (when the last user 3398 * reference is dropped, or when it is killed). 3399 */ 3400 static void 3401 prison_cleanup(struct prison *pr) 3402 { 3403 sx_assert(&allprison_lock, SA_XLOCKED); 3404 mtx_assert(&pr->pr_mtx, MA_NOTOWNED); 3405 vfs_exjail_delete(pr); 3406 shm_remove_prison(pr); 3407 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 3408 } 3409 3410 /* 3411 * Set or clear a permission bit in the pr_allow field, passing restrictions 3412 * (cleared permission) down to child jails. 3413 */ 3414 void 3415 prison_set_allow(struct ucred *cred, unsigned flag, int enable) 3416 { 3417 struct prison *pr; 3418 3419 pr = cred->cr_prison; 3420 sx_slock(&allprison_lock); 3421 mtx_lock(&pr->pr_mtx); 3422 prison_set_allow_locked(pr, flag, enable); 3423 mtx_unlock(&pr->pr_mtx); 3424 sx_sunlock(&allprison_lock); 3425 } 3426 3427 static void 3428 prison_set_allow_locked(struct prison *pr, unsigned flag, int enable) 3429 { 3430 struct prison *cpr; 3431 int descend; 3432 3433 if (enable != 0) 3434 pr->pr_allow |= flag; 3435 else { 3436 pr->pr_allow &= ~flag; 3437 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 3438 cpr->pr_allow &= ~flag; 3439 } 3440 } 3441 3442 /* 3443 * Check if a jail supports the given address family. 3444 * 3445 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3446 * if not. 3447 */ 3448 int 3449 prison_check_af(struct ucred *cred, int af) 3450 { 3451 struct prison *pr; 3452 int error; 3453 3454 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3455 3456 pr = cred->cr_prison; 3457 #ifdef VIMAGE 3458 /* Prisons with their own network stack are not limited. */ 3459 if (prison_owns_vnet(cred)) 3460 return (0); 3461 #endif 3462 3463 error = 0; 3464 switch (af) 3465 { 3466 #ifdef INET 3467 case AF_INET: 3468 if (pr->pr_flags & PR_IP4) 3469 { 3470 mtx_lock(&pr->pr_mtx); 3471 if ((pr->pr_flags & PR_IP4) && 3472 pr->pr_addrs[PR_INET] == NULL) 3473 error = EAFNOSUPPORT; 3474 mtx_unlock(&pr->pr_mtx); 3475 } 3476 break; 3477 #endif 3478 #ifdef INET6 3479 case AF_INET6: 3480 if (pr->pr_flags & PR_IP6) 3481 { 3482 mtx_lock(&pr->pr_mtx); 3483 if ((pr->pr_flags & PR_IP6) && 3484 pr->pr_addrs[PR_INET6] == NULL) 3485 error = EAFNOSUPPORT; 3486 mtx_unlock(&pr->pr_mtx); 3487 } 3488 break; 3489 #endif 3490 case AF_LOCAL: 3491 case AF_ROUTE: 3492 case AF_NETLINK: 3493 break; 3494 default: 3495 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3496 error = EAFNOSUPPORT; 3497 } 3498 return (error); 3499 } 3500 3501 /* 3502 * Check if given address belongs to the jail referenced by cred (wrapper to 3503 * prison_check_ip[46]). 3504 * 3505 * Returns 0 if jail doesn't restrict the address family or if address belongs 3506 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3507 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3508 */ 3509 int 3510 prison_if(struct ucred *cred, const struct sockaddr *sa) 3511 { 3512 #ifdef INET 3513 const struct sockaddr_in *sai; 3514 #endif 3515 #ifdef INET6 3516 const struct sockaddr_in6 *sai6; 3517 #endif 3518 int error; 3519 3520 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3521 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3522 3523 #ifdef VIMAGE 3524 if (prison_owns_vnet(cred)) 3525 return (0); 3526 #endif 3527 3528 error = 0; 3529 switch (sa->sa_family) 3530 { 3531 #ifdef INET 3532 case AF_INET: 3533 sai = (const struct sockaddr_in *)sa; 3534 error = prison_check_ip4(cred, &sai->sin_addr); 3535 break; 3536 #endif 3537 #ifdef INET6 3538 case AF_INET6: 3539 sai6 = (const struct sockaddr_in6 *)sa; 3540 error = prison_check_ip6(cred, &sai6->sin6_addr); 3541 break; 3542 #endif 3543 default: 3544 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3545 error = EAFNOSUPPORT; 3546 } 3547 return (error); 3548 } 3549 3550 /* 3551 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3552 */ 3553 int 3554 prison_check(struct ucred *cred1, struct ucred *cred2) 3555 { 3556 3557 return ((cred1->cr_prison == cred2->cr_prison || 3558 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3559 } 3560 3561 /* 3562 * For mountd/nfsd to run within a prison, it must be: 3563 * - A vnet prison. 3564 * - PR_ALLOW_NFSD must be set on it. 3565 * - The root directory (pr_root) of the prison must be 3566 * a file system mount point, so the mountd can hang 3567 * export information on it. 3568 * - The prison's enforce_statfs cannot be 0, so that 3569 * mountd(8) can do exports. 3570 */ 3571 bool 3572 prison_check_nfsd(struct ucred *cred) 3573 { 3574 3575 if (jailed_without_vnet(cred)) 3576 return (false); 3577 if (!prison_allow(cred, PR_ALLOW_NFSD)) 3578 return (false); 3579 if ((cred->cr_prison->pr_root->v_vflag & VV_ROOT) == 0) 3580 return (false); 3581 if (cred->cr_prison->pr_enforce_statfs == 0) 3582 return (false); 3583 return (true); 3584 } 3585 3586 /* 3587 * Return true if p2 is a child of p1, otherwise false. 3588 */ 3589 bool 3590 prison_ischild(struct prison *pr1, struct prison *pr2) 3591 { 3592 3593 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3594 if (pr1 == pr2) 3595 return (true); 3596 return (false); 3597 } 3598 3599 /* 3600 * Return true if the prison is currently alive. A prison is alive if it 3601 * holds user references and it isn't being removed. 3602 */ 3603 bool 3604 prison_isalive(const struct prison *pr) 3605 { 3606 3607 if (__predict_false(pr->pr_state != PRISON_STATE_ALIVE)) 3608 return (false); 3609 return (true); 3610 } 3611 3612 /* 3613 * Return true if the prison is currently valid. A prison is valid if it has 3614 * been fully created, and is not being destroyed. Note that dying prisons 3615 * are still considered valid. Invalid prisons won't be found under normal 3616 * circumstances, as they're only put in that state by functions that have 3617 * an exclusive hold on allprison_lock. 3618 */ 3619 bool 3620 prison_isvalid(struct prison *pr) 3621 { 3622 3623 if (__predict_false(pr->pr_state == PRISON_STATE_INVALID)) 3624 return (false); 3625 if (__predict_false(refcount_load(&pr->pr_ref) == 0)) 3626 return (false); 3627 return (true); 3628 } 3629 3630 /* 3631 * Return true if the passed credential is in a jail and that jail does not 3632 * have its own virtual network stack, otherwise false. 3633 */ 3634 bool 3635 jailed_without_vnet(struct ucred *cred) 3636 { 3637 3638 if (!jailed(cred)) 3639 return (false); 3640 #ifdef VIMAGE 3641 if (prison_owns_vnet(cred)) 3642 return (false); 3643 #endif 3644 3645 return (true); 3646 } 3647 3648 /* 3649 * Return the correct hostname (domainname, et al) for the passed credential. 3650 */ 3651 void 3652 getcredhostname(struct ucred *cred, char *buf, size_t size) 3653 { 3654 struct prison *pr; 3655 3656 /* 3657 * A NULL credential can be used to shortcut to the physical 3658 * system's hostname. 3659 */ 3660 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3661 mtx_lock(&pr->pr_mtx); 3662 strlcpy(buf, pr->pr_hostname, size); 3663 mtx_unlock(&pr->pr_mtx); 3664 } 3665 3666 void 3667 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3668 { 3669 3670 mtx_lock(&cred->cr_prison->pr_mtx); 3671 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3672 mtx_unlock(&cred->cr_prison->pr_mtx); 3673 } 3674 3675 void 3676 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3677 { 3678 3679 mtx_lock(&cred->cr_prison->pr_mtx); 3680 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3681 mtx_unlock(&cred->cr_prison->pr_mtx); 3682 } 3683 3684 void 3685 getcredhostid(struct ucred *cred, unsigned long *hostid) 3686 { 3687 3688 mtx_lock(&cred->cr_prison->pr_mtx); 3689 *hostid = cred->cr_prison->pr_hostid; 3690 mtx_unlock(&cred->cr_prison->pr_mtx); 3691 } 3692 3693 void 3694 getjailname(struct ucred *cred, char *name, size_t len) 3695 { 3696 3697 mtx_lock(&cred->cr_prison->pr_mtx); 3698 strlcpy(name, cred->cr_prison->pr_name, len); 3699 mtx_unlock(&cred->cr_prison->pr_mtx); 3700 } 3701 3702 #ifdef VIMAGE 3703 /* 3704 * Determine whether the prison represented by cred owns 3705 * its vnet rather than having it inherited. 3706 * 3707 * Returns true in case the prison owns the vnet, false otherwise. 3708 */ 3709 bool 3710 prison_owns_vnet(struct ucred *cred) 3711 { 3712 3713 /* 3714 * vnets cannot be added/removed after jail creation, 3715 * so no need to lock here. 3716 */ 3717 return ((cred->cr_prison->pr_flags & PR_VNET) != 0); 3718 } 3719 #endif 3720 3721 /* 3722 * Determine whether the subject represented by cred can "see" 3723 * status of a mount point. 3724 * Returns: 0 for permitted, ENOENT otherwise. 3725 * XXX: This function should be called cr_canseemount() and should be 3726 * placed in kern_prot.c. 3727 */ 3728 int 3729 prison_canseemount(struct ucred *cred, struct mount *mp) 3730 { 3731 struct prison *pr; 3732 struct statfs *sp; 3733 size_t len; 3734 3735 pr = cred->cr_prison; 3736 if (pr->pr_enforce_statfs == 0) 3737 return (0); 3738 if (pr->pr_root->v_mount == mp) 3739 return (0); 3740 if (pr->pr_enforce_statfs == 2) 3741 return (ENOENT); 3742 /* 3743 * If jail's chroot directory is set to "/" we should be able to see 3744 * all mount-points from inside a jail. 3745 * This is ugly check, but this is the only situation when jail's 3746 * directory ends with '/'. 3747 */ 3748 if (strcmp(pr->pr_path, "/") == 0) 3749 return (0); 3750 len = strlen(pr->pr_path); 3751 sp = &mp->mnt_stat; 3752 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3753 return (ENOENT); 3754 /* 3755 * Be sure that we don't have situation where jail's root directory 3756 * is "/some/path" and mount point is "/some/pathpath". 3757 */ 3758 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3759 return (ENOENT); 3760 return (0); 3761 } 3762 3763 void 3764 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3765 { 3766 char jpath[MAXPATHLEN]; 3767 struct prison *pr; 3768 size_t len; 3769 3770 pr = cred->cr_prison; 3771 if (pr->pr_enforce_statfs == 0) 3772 return; 3773 if (prison_canseemount(cred, mp) != 0) { 3774 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3775 strlcpy(sp->f_mntonname, "[restricted]", 3776 sizeof(sp->f_mntonname)); 3777 return; 3778 } 3779 if (pr->pr_root->v_mount == mp) { 3780 /* 3781 * Clear current buffer data, so we are sure nothing from 3782 * the valid path left there. 3783 */ 3784 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3785 *sp->f_mntonname = '/'; 3786 return; 3787 } 3788 /* 3789 * If jail's chroot directory is set to "/" we should be able to see 3790 * all mount-points from inside a jail. 3791 */ 3792 if (strcmp(pr->pr_path, "/") == 0) 3793 return; 3794 len = strlen(pr->pr_path); 3795 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3796 /* 3797 * Clear current buffer data, so we are sure nothing from 3798 * the valid path left there. 3799 */ 3800 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3801 if (*jpath == '\0') { 3802 /* Should never happen. */ 3803 *sp->f_mntonname = '/'; 3804 } else { 3805 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3806 } 3807 } 3808 3809 /* 3810 * Check with permission for a specific privilege is granted within jail. We 3811 * have a specific list of accepted privileges; the rest are denied. 3812 */ 3813 int 3814 prison_priv_check(struct ucred *cred, int priv) 3815 { 3816 struct prison *pr; 3817 int error; 3818 3819 /* 3820 * Some policies have custom handlers. This routine should not be 3821 * called for them. See priv_check_cred(). 3822 */ 3823 switch (priv) { 3824 case PRIV_VFS_LOOKUP: 3825 case PRIV_VFS_GENERATION: 3826 KASSERT(0, ("prison_priv_check instead of a custom handler " 3827 "called for %d\n", priv)); 3828 } 3829 3830 if (!jailed(cred)) 3831 return (0); 3832 3833 #ifdef VIMAGE 3834 /* 3835 * Privileges specific to prisons with a virtual network stack. 3836 * There might be a duplicate entry here in case the privilege 3837 * is only granted conditionally in the legacy jail case. 3838 */ 3839 switch (priv) { 3840 /* 3841 * NFS-specific privileges. 3842 */ 3843 case PRIV_NFS_DAEMON: 3844 case PRIV_VFS_GETFH: 3845 case PRIV_VFS_MOUNT_EXPORTED: 3846 if (!prison_check_nfsd(cred)) 3847 return (EPERM); 3848 #ifdef notyet 3849 case PRIV_NFS_LOCKD: 3850 #endif 3851 /* 3852 * Network stack privileges. 3853 */ 3854 case PRIV_NET_BRIDGE: 3855 case PRIV_NET_GRE: 3856 case PRIV_NET_BPF: 3857 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3858 case PRIV_NET_ROUTE: 3859 case PRIV_NET_TAP: 3860 case PRIV_NET_SETIFMTU: 3861 case PRIV_NET_SETIFFLAGS: 3862 case PRIV_NET_SETIFCAP: 3863 case PRIV_NET_SETIFDESCR: 3864 case PRIV_NET_SETIFNAME : 3865 case PRIV_NET_SETIFMETRIC: 3866 case PRIV_NET_SETIFPHYS: 3867 case PRIV_NET_SETIFMAC: 3868 case PRIV_NET_SETLANPCP: 3869 case PRIV_NET_ADDMULTI: 3870 case PRIV_NET_DELMULTI: 3871 case PRIV_NET_HWIOCTL: 3872 case PRIV_NET_SETLLADDR: 3873 case PRIV_NET_ADDIFGROUP: 3874 case PRIV_NET_DELIFGROUP: 3875 case PRIV_NET_IFCREATE: 3876 case PRIV_NET_IFDESTROY: 3877 case PRIV_NET_ADDIFADDR: 3878 case PRIV_NET_DELIFADDR: 3879 case PRIV_NET_LAGG: 3880 case PRIV_NET_GIF: 3881 case PRIV_NET_SETIFVNET: 3882 case PRIV_NET_SETIFFIB: 3883 case PRIV_NET_OVPN: 3884 case PRIV_NET_ME: 3885 case PRIV_NET_WG: 3886 3887 /* 3888 * 802.11-related privileges. 3889 */ 3890 case PRIV_NET80211_VAP_GETKEY: 3891 case PRIV_NET80211_VAP_MANAGE: 3892 3893 #ifdef notyet 3894 /* 3895 * ATM privileges. 3896 */ 3897 case PRIV_NETATM_CFG: 3898 case PRIV_NETATM_ADD: 3899 case PRIV_NETATM_DEL: 3900 case PRIV_NETATM_SET: 3901 3902 /* 3903 * Bluetooth privileges. 3904 */ 3905 case PRIV_NETBLUETOOTH_RAW: 3906 #endif 3907 3908 /* 3909 * Netgraph and netgraph module privileges. 3910 */ 3911 case PRIV_NETGRAPH_CONTROL: 3912 #ifdef notyet 3913 case PRIV_NETGRAPH_TTY: 3914 #endif 3915 3916 /* 3917 * IPv4 and IPv6 privileges. 3918 */ 3919 case PRIV_NETINET_IPFW: 3920 case PRIV_NETINET_DIVERT: 3921 case PRIV_NETINET_PF: 3922 case PRIV_NETINET_DUMMYNET: 3923 case PRIV_NETINET_CARP: 3924 case PRIV_NETINET_MROUTE: 3925 case PRIV_NETINET_RAW: 3926 case PRIV_NETINET_ADDRCTRL6: 3927 case PRIV_NETINET_ND6: 3928 case PRIV_NETINET_SCOPE6: 3929 case PRIV_NETINET_ALIFETIME6: 3930 case PRIV_NETINET_IPSEC: 3931 case PRIV_NETINET_BINDANY: 3932 3933 #ifdef notyet 3934 /* 3935 * NCP privileges. 3936 */ 3937 case PRIV_NETNCP: 3938 3939 /* 3940 * SMB privileges. 3941 */ 3942 case PRIV_NETSMB: 3943 #endif 3944 3945 /* 3946 * No default: or deny here. 3947 * In case of no permit fall through to next switch(). 3948 */ 3949 if (cred->cr_prison->pr_flags & PR_VNET) 3950 return (0); 3951 } 3952 #endif /* VIMAGE */ 3953 3954 switch (priv) { 3955 /* 3956 * Allow ktrace privileges for root in jail. 3957 */ 3958 case PRIV_KTRACE: 3959 3960 #if 0 3961 /* 3962 * Allow jailed processes to configure audit identity and 3963 * submit audit records (login, etc). In the future we may 3964 * want to further refine the relationship between audit and 3965 * jail. 3966 */ 3967 case PRIV_AUDIT_GETAUDIT: 3968 case PRIV_AUDIT_SETAUDIT: 3969 case PRIV_AUDIT_SUBMIT: 3970 #endif 3971 3972 /* 3973 * Allow jailed processes to manipulate process UNIX 3974 * credentials in any way they see fit. 3975 */ 3976 case PRIV_CRED_SETCRED: 3977 case PRIV_CRED_SETUID: 3978 case PRIV_CRED_SETEUID: 3979 case PRIV_CRED_SETGID: 3980 case PRIV_CRED_SETEGID: 3981 case PRIV_CRED_SETGROUPS: 3982 case PRIV_CRED_SETREUID: 3983 case PRIV_CRED_SETREGID: 3984 case PRIV_CRED_SETRESUID: 3985 case PRIV_CRED_SETRESGID: 3986 3987 /* 3988 * Jail implements visibility constraints already, so allow 3989 * jailed root to override uid/gid-based constraints. 3990 */ 3991 case PRIV_SEEOTHERGIDS: 3992 case PRIV_SEEOTHERUIDS: 3993 case PRIV_SEEJAILPROC: 3994 3995 /* 3996 * Jail implements inter-process debugging limits already, so 3997 * allow jailed root various debugging privileges. 3998 */ 3999 case PRIV_DEBUG_DIFFCRED: 4000 case PRIV_DEBUG_SUGID: 4001 case PRIV_DEBUG_UNPRIV: 4002 4003 /* 4004 * Allow jail to set various resource limits and login 4005 * properties, and for now, exceed process resource limits. 4006 */ 4007 case PRIV_PROC_LIMIT: 4008 case PRIV_PROC_SETLOGIN: 4009 case PRIV_PROC_SETRLIMIT: 4010 4011 /* 4012 * System V and POSIX IPC privileges are granted in jail. 4013 */ 4014 case PRIV_IPC_READ: 4015 case PRIV_IPC_WRITE: 4016 case PRIV_IPC_ADMIN: 4017 case PRIV_IPC_MSGSIZE: 4018 case PRIV_MQ_ADMIN: 4019 4020 /* 4021 * Jail operations within a jail work on child jails. 4022 */ 4023 case PRIV_JAIL_ATTACH: 4024 case PRIV_JAIL_SET: 4025 case PRIV_JAIL_REMOVE: 4026 4027 /* 4028 * Jail implements its own inter-process limits, so allow 4029 * root processes in jail to change scheduling on other 4030 * processes in the same jail. Likewise for signalling. 4031 */ 4032 case PRIV_SCHED_DIFFCRED: 4033 case PRIV_SCHED_CPUSET: 4034 case PRIV_SIGNAL_DIFFCRED: 4035 case PRIV_SIGNAL_SUGID: 4036 4037 /* 4038 * Allow jailed processes to write to sysctls marked as jail 4039 * writable. 4040 */ 4041 case PRIV_SYSCTL_WRITEJAIL: 4042 4043 /* 4044 * Allow root in jail to manage a variety of quota 4045 * properties. These should likely be conditional on a 4046 * configuration option. 4047 */ 4048 case PRIV_VFS_GETQUOTA: 4049 case PRIV_VFS_SETQUOTA: 4050 4051 /* 4052 * Since Jail relies on chroot() to implement file system 4053 * protections, grant many VFS privileges to root in jail. 4054 * Be careful to exclude mount-related and NFS-related 4055 * privileges. 4056 */ 4057 case PRIV_VFS_READ: 4058 case PRIV_VFS_WRITE: 4059 case PRIV_VFS_ADMIN: 4060 case PRIV_VFS_EXEC: 4061 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 4062 case PRIV_VFS_CHFLAGS_DEV: 4063 case PRIV_VFS_CHOWN: 4064 case PRIV_VFS_CHROOT: 4065 case PRIV_VFS_RETAINSUGID: 4066 case PRIV_VFS_FCHROOT: 4067 case PRIV_VFS_LINK: 4068 case PRIV_VFS_SETGID: 4069 case PRIV_VFS_STAT: 4070 case PRIV_VFS_STICKYFILE: 4071 4072 /* 4073 * As in the non-jail case, non-root users are expected to be 4074 * able to read kernel/physical memory (provided /dev/[k]mem 4075 * exists in the jail and they have permission to access it). 4076 */ 4077 case PRIV_KMEM_READ: 4078 return (0); 4079 4080 /* 4081 * Depending on the global setting, allow privilege of 4082 * setting system flags. 4083 */ 4084 case PRIV_VFS_SYSFLAGS: 4085 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 4086 return (0); 4087 else 4088 return (EPERM); 4089 4090 /* 4091 * Depending on the global setting, allow privilege of 4092 * mounting/unmounting file systems. 4093 */ 4094 case PRIV_VFS_MOUNT: 4095 case PRIV_VFS_UNMOUNT: 4096 case PRIV_VFS_MOUNT_NONUSER: 4097 case PRIV_VFS_MOUNT_OWNER: 4098 pr = cred->cr_prison; 4099 prison_lock(pr); 4100 if (pr->pr_allow & PR_ALLOW_MOUNT && pr->pr_enforce_statfs < 2) 4101 error = 0; 4102 else 4103 error = EPERM; 4104 prison_unlock(pr); 4105 return (error); 4106 4107 /* 4108 * Jails should hold no disposition on the PRIV_VFS_READ_DIR 4109 * policy. priv_check_cred will not specifically allow it, and 4110 * we may want a MAC policy to allow it. 4111 */ 4112 case PRIV_VFS_READ_DIR: 4113 return (0); 4114 4115 /* 4116 * Conditionally allow privileged process in the jail to 4117 * manipulate filesystem extended attributes in the system 4118 * namespace. 4119 */ 4120 case PRIV_VFS_EXTATTR_SYSTEM: 4121 if ((cred->cr_prison->pr_allow & PR_ALLOW_EXTATTR) != 0) 4122 return (0); 4123 else 4124 return (EPERM); 4125 4126 /* 4127 * Conditionnaly allow locking (unlocking) physical pages 4128 * in memory. 4129 */ 4130 case PRIV_VM_MLOCK: 4131 case PRIV_VM_MUNLOCK: 4132 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK) 4133 return (0); 4134 else 4135 return (EPERM); 4136 4137 /* 4138 * Conditionally allow jailed root to bind reserved ports. 4139 */ 4140 case PRIV_NETINET_RESERVEDPORT: 4141 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS) 4142 return (0); 4143 else 4144 return (EPERM); 4145 4146 /* 4147 * Allow jailed root to reuse in-use ports. 4148 */ 4149 case PRIV_NETINET_REUSEPORT: 4150 return (0); 4151 4152 /* 4153 * Allow jailed root to set certain IPv4/6 (option) headers. 4154 */ 4155 case PRIV_NETINET_SETHDROPTS: 4156 return (0); 4157 4158 /* 4159 * Conditionally allow creating raw sockets in jail. 4160 */ 4161 case PRIV_NETINET_RAW: 4162 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 4163 return (0); 4164 else 4165 return (EPERM); 4166 4167 /* 4168 * Since jail implements its own visibility limits on netstat 4169 * sysctls, allow getcred. This allows identd to work in 4170 * jail. 4171 */ 4172 case PRIV_NETINET_GETCRED: 4173 return (0); 4174 4175 /* 4176 * Allow jailed root to set loginclass. 4177 */ 4178 case PRIV_PROC_SETLOGINCLASS: 4179 return (0); 4180 4181 /* 4182 * Do not allow a process inside a jail to read the kernel 4183 * message buffer unless explicitly permitted. 4184 */ 4185 case PRIV_MSGBUF: 4186 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF) 4187 return (0); 4188 return (EPERM); 4189 4190 /* 4191 * Conditionally allow privileged process in the jail adjust 4192 * machine time. 4193 */ 4194 case PRIV_ADJTIME: 4195 case PRIV_NTP_ADJTIME: 4196 if (cred->cr_prison->pr_allow & 4197 (PR_ALLOW_ADJTIME | PR_ALLOW_SETTIME)) { 4198 return (0); 4199 } 4200 return (EPERM); 4201 4202 /* 4203 * Conditionally allow privileged process in the jail set 4204 * machine time. 4205 */ 4206 case PRIV_CLOCK_SETTIME: 4207 if (cred->cr_prison->pr_allow & PR_ALLOW_SETTIME) 4208 return (0); 4209 else 4210 return (EPERM); 4211 4212 default: 4213 /* 4214 * In all remaining cases, deny the privilege request. This 4215 * includes almost all network privileges, many system 4216 * configuration privileges. 4217 */ 4218 return (EPERM); 4219 } 4220 } 4221 4222 /* 4223 * Return the part of pr2's name that is relative to pr1, or the whole name 4224 * if it does not directly follow. 4225 */ 4226 4227 char * 4228 prison_name(struct prison *pr1, struct prison *pr2) 4229 { 4230 char *name; 4231 4232 /* Jails see themselves as "0" (if they see themselves at all). */ 4233 if (pr1 == pr2) 4234 return "0"; 4235 name = pr2->pr_name; 4236 if (prison_ischild(pr1, pr2)) { 4237 /* 4238 * pr1 isn't locked (and allprison_lock may not be either) 4239 * so its length can't be counted on. But the number of dots 4240 * can be counted on - and counted. 4241 */ 4242 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 4243 name = strchr(name, '.') + 1; 4244 } 4245 return (name); 4246 } 4247 4248 /* 4249 * Return the part of pr2's path that is relative to pr1, or the whole path 4250 * if it does not directly follow. 4251 */ 4252 static char * 4253 prison_path(struct prison *pr1, struct prison *pr2) 4254 { 4255 char *path1, *path2; 4256 int len1; 4257 4258 path1 = pr1->pr_path; 4259 path2 = pr2->pr_path; 4260 if (!strcmp(path1, "/")) 4261 return (path2); 4262 len1 = strlen(path1); 4263 if (strncmp(path1, path2, len1)) 4264 return (path2); 4265 if (path2[len1] == '\0') 4266 return "/"; 4267 if (path2[len1] == '/') 4268 return (path2 + len1); 4269 return (path2); 4270 } 4271 4272 /* 4273 * Jail-related sysctls. 4274 */ 4275 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 4276 "Jails"); 4277 4278 #if defined(INET) || defined(INET6) 4279 /* 4280 * Copy address array to memory that would be then SYSCTL_OUT-ed. 4281 * sysctl_jail_list() helper. 4282 */ 4283 static void 4284 prison_ip_copyout(struct prison *pr, const pr_family_t af, void **out, int *len) 4285 { 4286 const struct prison_ip *pip; 4287 const size_t size = pr_families[af].size; 4288 4289 again: 4290 mtx_assert(&pr->pr_mtx, MA_OWNED); 4291 if ((pip = pr->pr_addrs[af]) != NULL) { 4292 if (*len < pip->ips) { 4293 *len = pip->ips; 4294 mtx_unlock(&pr->pr_mtx); 4295 *out = realloc(*out, *len * size, M_TEMP, M_WAITOK); 4296 mtx_lock(&pr->pr_mtx); 4297 goto again; 4298 } 4299 bcopy(pip->pr_ip, *out, pip->ips * size); 4300 } 4301 } 4302 #endif 4303 4304 static int 4305 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4306 { 4307 struct xprison *xp; 4308 struct prison *pr, *cpr; 4309 #ifdef INET 4310 struct in_addr *ip4 = NULL; 4311 int ip4s = 0; 4312 #endif 4313 #ifdef INET6 4314 struct in6_addr *ip6 = NULL; 4315 int ip6s = 0; 4316 #endif 4317 int descend, error; 4318 4319 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4320 pr = req->td->td_ucred->cr_prison; 4321 error = 0; 4322 sx_slock(&allprison_lock); 4323 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4324 mtx_lock(&cpr->pr_mtx); 4325 #ifdef INET 4326 prison_ip_copyout(cpr, PR_INET, (void **)&ip4, &ip4s); 4327 #endif 4328 #ifdef INET6 4329 prison_ip_copyout(cpr, PR_INET6, (void **)&ip6, &ip6s); 4330 #endif 4331 bzero(xp, sizeof(*xp)); 4332 xp->pr_version = XPRISON_VERSION; 4333 xp->pr_id = cpr->pr_id; 4334 xp->pr_state = cpr->pr_state; 4335 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4336 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4337 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4338 #ifdef INET 4339 xp->pr_ip4s = ip4s; 4340 #endif 4341 #ifdef INET6 4342 xp->pr_ip6s = ip6s; 4343 #endif 4344 mtx_unlock(&cpr->pr_mtx); 4345 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4346 if (error) 4347 break; 4348 #ifdef INET 4349 if (xp->pr_ip4s > 0) { 4350 error = SYSCTL_OUT(req, ip4, 4351 xp->pr_ip4s * sizeof(struct in_addr)); 4352 if (error) 4353 break; 4354 } 4355 #endif 4356 #ifdef INET6 4357 if (xp->pr_ip6s > 0) { 4358 error = SYSCTL_OUT(req, ip6, 4359 xp->pr_ip6s * sizeof(struct in6_addr)); 4360 if (error) 4361 break; 4362 } 4363 #endif 4364 } 4365 sx_sunlock(&allprison_lock); 4366 free(xp, M_TEMP); 4367 #ifdef INET 4368 free(ip4, M_TEMP); 4369 #endif 4370 #ifdef INET6 4371 free(ip6, M_TEMP); 4372 #endif 4373 return (error); 4374 } 4375 4376 SYSCTL_OID(_security_jail, OID_AUTO, list, 4377 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4378 sysctl_jail_list, "S", "List of active jails"); 4379 4380 static int 4381 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4382 { 4383 int error, injail; 4384 4385 injail = jailed(req->td->td_ucred); 4386 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4387 4388 return (error); 4389 } 4390 4391 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4392 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4393 sysctl_jail_jailed, "I", "Process in jail?"); 4394 4395 static int 4396 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4397 { 4398 int error, havevnet; 4399 #ifdef VIMAGE 4400 struct ucred *cred = req->td->td_ucred; 4401 4402 havevnet = jailed(cred) && prison_owns_vnet(cred); 4403 #else 4404 havevnet = 0; 4405 #endif 4406 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4407 4408 return (error); 4409 } 4410 4411 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4412 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4413 sysctl_jail_vnet, "I", "Jail owns vnet?"); 4414 4415 #if defined(INET) || defined(INET6) 4416 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4417 &jail_max_af_ips, 0, 4418 "Number of IP addresses a jail may have at most per address family (deprecated)"); 4419 #endif 4420 4421 /* 4422 * Default parameters for jail(2) compatibility. For historical reasons, 4423 * the sysctl names have varying similarity to the parameter names. Prisons 4424 * just see their own parameters, and can't change them. 4425 */ 4426 static int 4427 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4428 { 4429 int error, i; 4430 4431 /* Get the current flag value, and convert it to a boolean. */ 4432 if (req->td->td_ucred->cr_prison == &prison0) { 4433 mtx_lock(&prison0.pr_mtx); 4434 i = (jail_default_allow & arg2) != 0; 4435 mtx_unlock(&prison0.pr_mtx); 4436 } else 4437 i = prison_allow(req->td->td_ucred, arg2); 4438 4439 if (arg1 != NULL) 4440 i = !i; 4441 error = sysctl_handle_int(oidp, &i, 0, req); 4442 if (error || !req->newptr) 4443 return (error); 4444 i = i ? arg2 : 0; 4445 if (arg1 != NULL) 4446 i ^= arg2; 4447 /* 4448 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4449 * for writing. 4450 */ 4451 mtx_lock(&prison0.pr_mtx); 4452 jail_default_allow = (jail_default_allow & ~arg2) | i; 4453 mtx_unlock(&prison0.pr_mtx); 4454 return (0); 4455 } 4456 4457 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4458 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4459 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4460 "Processes in jail can set their hostnames (deprecated)"); 4461 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4462 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4463 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4464 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 4465 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4466 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4467 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4468 "Processes in jail can use System V IPC primitives (deprecated)"); 4469 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4470 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4471 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4472 "Prison root can create raw sockets (deprecated)"); 4473 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4474 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4475 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4476 "Processes in jail can alter system file flags (deprecated)"); 4477 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4478 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4479 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4480 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 4481 SYSCTL_PROC(_security_jail, OID_AUTO, mlock_allowed, 4482 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4483 NULL, PR_ALLOW_MLOCK, sysctl_jail_default_allow, "I", 4484 "Processes in jail can lock/unlock physical pages in memory"); 4485 4486 static int 4487 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4488 { 4489 struct prison *pr; 4490 int level, error; 4491 4492 pr = req->td->td_ucred->cr_prison; 4493 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4494 error = sysctl_handle_int(oidp, &level, 0, req); 4495 if (error || !req->newptr) 4496 return (error); 4497 *(int *)arg1 = level; 4498 return (0); 4499 } 4500 4501 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4502 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4503 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4504 sysctl_jail_default_level, "I", 4505 "Processes in jail cannot see all mounted file systems (deprecated)"); 4506 4507 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4508 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4509 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4510 sysctl_jail_default_level, "I", 4511 "Ruleset for the devfs filesystem in jail (deprecated)"); 4512 4513 SYSCTL_NODE(_security_jail, OID_AUTO, children, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 4514 "Limits and stats of child jails"); 4515 4516 static int 4517 sysctl_jail_children(SYSCTL_HANDLER_ARGS) 4518 { 4519 struct prison *pr; 4520 int i; 4521 4522 pr = req->td->td_ucred->cr_prison; 4523 4524 switch (oidp->oid_kind & CTLTYPE) { 4525 case CTLTYPE_INT: 4526 i = *(int *)((char *)pr + arg2); 4527 return (SYSCTL_OUT(req, &i, sizeof(i))); 4528 } 4529 4530 return (0); 4531 } 4532 4533 SYSCTL_PROC(_security_jail_children, OID_AUTO, max, 4534 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4535 NULL, offsetof(struct prison, pr_childmax), sysctl_jail_children, 4536 "I", "Maximum number of child jails"); 4537 SYSCTL_PROC(_security_jail_children, OID_AUTO, cur, 4538 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4539 NULL, offsetof(struct prison, pr_childcount), sysctl_jail_children, 4540 "I", "Current number of child jails"); 4541 4542 /* 4543 * Nodes to describe jail parameters. Maximum length of string parameters 4544 * is returned in the string itself, and the other parameters exist merely 4545 * to make themselves and their types known. 4546 */ 4547 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 4548 "Jail parameters"); 4549 4550 int 4551 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4552 { 4553 int i; 4554 long l; 4555 size_t s; 4556 char numbuf[12]; 4557 4558 switch (oidp->oid_kind & CTLTYPE) 4559 { 4560 case CTLTYPE_LONG: 4561 case CTLTYPE_ULONG: 4562 l = 0; 4563 #ifdef SCTL_MASK32 4564 if (!(req->flags & SCTL_MASK32)) 4565 #endif 4566 return (SYSCTL_OUT(req, &l, sizeof(l))); 4567 case CTLTYPE_INT: 4568 case CTLTYPE_UINT: 4569 i = 0; 4570 return (SYSCTL_OUT(req, &i, sizeof(i))); 4571 case CTLTYPE_STRING: 4572 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4573 return 4574 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4575 case CTLTYPE_STRUCT: 4576 s = (size_t)arg2; 4577 return (SYSCTL_OUT(req, &s, sizeof(s))); 4578 } 4579 return (0); 4580 } 4581 4582 /* 4583 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 4584 * jail creation time but cannot be changed in an existing jail. 4585 */ 4586 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4587 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4588 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4589 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4590 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4591 "I", "Jail secure level"); 4592 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 4593 "Jail value for kern.osreldate and uname -K"); 4594 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 4595 "Jail value for kern.osrelease and uname -r"); 4596 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4597 "I", "Jail cannot see all mounted file systems"); 4598 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4599 "I", "Ruleset for in-jail devfs mounts"); 4600 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4601 "B", "Jail persistence"); 4602 #ifdef VIMAGE 4603 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4604 "E,jailsys", "Virtual network stack"); 4605 #endif 4606 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4607 "B", "Jail is in the process of shutting down"); 4608 4609 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4610 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4611 "I", "Current number of child jails"); 4612 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4613 "I", "Maximum number of child jails"); 4614 4615 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4616 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4617 "Jail hostname"); 4618 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4619 "Jail NIS domainname"); 4620 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4621 "Jail host UUID"); 4622 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4623 "LU", "Jail host ID"); 4624 4625 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4626 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4627 4628 #ifdef INET 4629 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4630 "Jail IPv4 address virtualization"); 4631 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4632 "S,in_addr,a", "Jail IPv4 addresses"); 4633 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4634 "B", "Do (not) use IPv4 source address selection rather than the " 4635 "primary jail IPv4 address."); 4636 #endif 4637 #ifdef INET6 4638 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4639 "Jail IPv6 address virtualization"); 4640 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4641 "S,in6_addr,a", "Jail IPv6 addresses"); 4642 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4643 "B", "Do (not) use IPv6 source address selection rather than the " 4644 "primary jail IPv6 address."); 4645 #endif 4646 4647 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4648 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4649 "B", "Jail may set hostname"); 4650 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4651 "B", "Jail may use SYSV IPC"); 4652 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4653 "B", "Jail may create raw sockets"); 4654 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4655 "B", "Jail may alter system file flags"); 4656 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4657 "B", "Jail may set file quotas"); 4658 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4659 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4660 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW, 4661 "B", "Jail may lock (unlock) physical pages in memory"); 4662 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW, 4663 "B", "Jail may bind sockets to reserved ports"); 4664 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW, 4665 "B", "Jail may read the kernel message buffer"); 4666 SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW, 4667 "B", "Unprivileged processes may use process debugging facilities"); 4668 SYSCTL_JAIL_PARAM(_allow, suser, CTLTYPE_INT | CTLFLAG_RW, 4669 "B", "Processes in jail with uid 0 have privilege"); 4670 #ifdef VIMAGE 4671 SYSCTL_JAIL_PARAM(_allow, nfsd, CTLTYPE_INT | CTLFLAG_RW, 4672 "B", "Mountd/nfsd may run in the jail"); 4673 #endif 4674 SYSCTL_JAIL_PARAM(_allow, extattr, CTLTYPE_INT | CTLFLAG_RW, 4675 "B", "Jail may set system-level filesystem extended attributes"); 4676 SYSCTL_JAIL_PARAM(_allow, adjtime, CTLTYPE_INT | CTLFLAG_RW, 4677 "B", "Jail may adjust system time"); 4678 SYSCTL_JAIL_PARAM(_allow, settime, CTLTYPE_INT | CTLFLAG_RW, 4679 "B", "Jail may set system time"); 4680 4681 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4682 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4683 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4684 4685 /* 4686 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return 4687 * its associated bit in the pr_allow bitmask, or zero if the parameter was 4688 * not created. 4689 */ 4690 unsigned 4691 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr, 4692 const char *descr) 4693 { 4694 struct bool_flags *bf; 4695 struct sysctl_oid *parent; 4696 char *allow_name, *allow_noname, *allowed; 4697 #ifndef NO_SYSCTL_DESCR 4698 char *descr_deprecated; 4699 #endif 4700 u_int allow_flag; 4701 4702 if (prefix 4703 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name) 4704 < 0 || 4705 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name) 4706 < 0 4707 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 || 4708 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) { 4709 free(allow_name, M_PRISON); 4710 return 0; 4711 } 4712 4713 /* 4714 * See if this parameter has already beed added, i.e. a module was 4715 * previously loaded/unloaded. 4716 */ 4717 mtx_lock(&prison0.pr_mtx); 4718 for (bf = pr_flag_allow; 4719 bf < pr_flag_allow + nitems(pr_flag_allow) && 4720 atomic_load_int(&bf->flag) != 0; 4721 bf++) { 4722 if (strcmp(bf->name, allow_name) == 0) { 4723 allow_flag = bf->flag; 4724 goto no_add; 4725 } 4726 } 4727 4728 /* 4729 * Find a free bit in pr_allow_all, failing if there are none 4730 * (which shouldn't happen as long as we keep track of how many 4731 * potential dynamic flags exist). 4732 */ 4733 for (allow_flag = 1;; allow_flag <<= 1) { 4734 if (allow_flag == 0) 4735 goto no_add; 4736 if ((pr_allow_all & allow_flag) == 0) 4737 break; 4738 } 4739 4740 /* Note the parameter in the next open slot in pr_flag_allow. */ 4741 for (bf = pr_flag_allow; ; bf++) { 4742 if (bf == pr_flag_allow + nitems(pr_flag_allow)) { 4743 /* This should never happen, but is not fatal. */ 4744 allow_flag = 0; 4745 goto no_add; 4746 } 4747 if (atomic_load_int(&bf->flag) == 0) 4748 break; 4749 } 4750 bf->name = allow_name; 4751 bf->noname = allow_noname; 4752 pr_allow_all |= allow_flag; 4753 /* 4754 * prison0 always has permission for the new parameter. 4755 * Other jails must have it granted to them. 4756 */ 4757 prison0.pr_allow |= allow_flag; 4758 /* The flag indicates a valid entry, so make sure it is set last. */ 4759 atomic_store_rel_int(&bf->flag, allow_flag); 4760 mtx_unlock(&prison0.pr_mtx); 4761 4762 /* 4763 * Create sysctls for the parameter, and the back-compat global 4764 * permission. 4765 */ 4766 parent = prefix 4767 ? SYSCTL_ADD_NODE(NULL, 4768 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow), 4769 OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr) 4770 : &sysctl___security_jail_param_allow; 4771 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO, 4772 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4773 NULL, 0, sysctl_jail_param, "B", descr); 4774 if ((prefix 4775 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name) 4776 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) { 4777 #ifndef NO_SYSCTL_DESCR 4778 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)", 4779 descr); 4780 #endif 4781 (void)SYSCTL_ADD_PROC(NULL, 4782 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed, 4783 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag, 4784 sysctl_jail_default_allow, "I", descr_deprecated); 4785 #ifndef NO_SYSCTL_DESCR 4786 free(descr_deprecated, M_TEMP); 4787 #endif 4788 free(allowed, M_TEMP); 4789 } 4790 return allow_flag; 4791 4792 no_add: 4793 mtx_unlock(&prison0.pr_mtx); 4794 free(allow_name, M_PRISON); 4795 free(allow_noname, M_PRISON); 4796 return allow_flag; 4797 } 4798 4799 /* 4800 * The VFS system will register jail-aware filesystems here. They each get 4801 * a parameter allow.mount.xxxfs and a flag to check when a jailed user 4802 * attempts to mount. 4803 */ 4804 void 4805 prison_add_vfs(struct vfsconf *vfsp) 4806 { 4807 #ifdef NO_SYSCTL_DESCR 4808 4809 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 4810 NULL, NULL); 4811 #else 4812 char *descr; 4813 4814 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system", 4815 vfsp->vfc_name); 4816 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 4817 NULL, descr); 4818 free(descr, M_TEMP); 4819 #endif 4820 } 4821 4822 #ifdef RACCT 4823 void 4824 prison_racct_foreach(void (*callback)(struct racct *racct, 4825 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 4826 void *arg2, void *arg3) 4827 { 4828 struct prison_racct *prr; 4829 4830 ASSERT_RACCT_ENABLED(); 4831 4832 sx_slock(&allprison_lock); 4833 if (pre != NULL) 4834 (pre)(); 4835 LIST_FOREACH(prr, &allprison_racct, prr_next) 4836 (callback)(prr->prr_racct, arg2, arg3); 4837 if (post != NULL) 4838 (post)(); 4839 sx_sunlock(&allprison_lock); 4840 } 4841 4842 static struct prison_racct * 4843 prison_racct_find_locked(const char *name) 4844 { 4845 struct prison_racct *prr; 4846 4847 ASSERT_RACCT_ENABLED(); 4848 sx_assert(&allprison_lock, SA_XLOCKED); 4849 4850 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4851 return (NULL); 4852 4853 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4854 if (strcmp(name, prr->prr_name) != 0) 4855 continue; 4856 4857 /* Found prison_racct with a matching name? */ 4858 prison_racct_hold(prr); 4859 return (prr); 4860 } 4861 4862 /* Add new prison_racct. */ 4863 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4864 racct_create(&prr->prr_racct); 4865 4866 strcpy(prr->prr_name, name); 4867 refcount_init(&prr->prr_refcount, 1); 4868 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4869 4870 return (prr); 4871 } 4872 4873 struct prison_racct * 4874 prison_racct_find(const char *name) 4875 { 4876 struct prison_racct *prr; 4877 4878 ASSERT_RACCT_ENABLED(); 4879 4880 sx_xlock(&allprison_lock); 4881 prr = prison_racct_find_locked(name); 4882 sx_xunlock(&allprison_lock); 4883 return (prr); 4884 } 4885 4886 void 4887 prison_racct_hold(struct prison_racct *prr) 4888 { 4889 4890 ASSERT_RACCT_ENABLED(); 4891 4892 refcount_acquire(&prr->prr_refcount); 4893 } 4894 4895 static void 4896 prison_racct_free_locked(struct prison_racct *prr) 4897 { 4898 4899 ASSERT_RACCT_ENABLED(); 4900 sx_assert(&allprison_lock, SA_XLOCKED); 4901 4902 if (refcount_release(&prr->prr_refcount)) { 4903 racct_destroy(&prr->prr_racct); 4904 LIST_REMOVE(prr, prr_next); 4905 free(prr, M_PRISON_RACCT); 4906 } 4907 } 4908 4909 void 4910 prison_racct_free(struct prison_racct *prr) 4911 { 4912 4913 ASSERT_RACCT_ENABLED(); 4914 sx_assert(&allprison_lock, SA_UNLOCKED); 4915 4916 if (refcount_release_if_not_last(&prr->prr_refcount)) 4917 return; 4918 4919 sx_xlock(&allprison_lock); 4920 prison_racct_free_locked(prr); 4921 sx_xunlock(&allprison_lock); 4922 } 4923 4924 static void 4925 prison_racct_attach(struct prison *pr) 4926 { 4927 struct prison_racct *prr; 4928 4929 ASSERT_RACCT_ENABLED(); 4930 sx_assert(&allprison_lock, SA_XLOCKED); 4931 4932 prr = prison_racct_find_locked(pr->pr_name); 4933 KASSERT(prr != NULL, ("cannot find prison_racct")); 4934 4935 pr->pr_prison_racct = prr; 4936 } 4937 4938 /* 4939 * Handle jail renaming. From the racct point of view, renaming means 4940 * moving from one prison_racct to another. 4941 */ 4942 static void 4943 prison_racct_modify(struct prison *pr) 4944 { 4945 #ifdef RCTL 4946 struct proc *p; 4947 struct ucred *cred; 4948 #endif 4949 struct prison_racct *oldprr; 4950 4951 ASSERT_RACCT_ENABLED(); 4952 4953 sx_slock(&allproc_lock); 4954 sx_xlock(&allprison_lock); 4955 4956 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4957 sx_xunlock(&allprison_lock); 4958 sx_sunlock(&allproc_lock); 4959 return; 4960 } 4961 4962 oldprr = pr->pr_prison_racct; 4963 pr->pr_prison_racct = NULL; 4964 4965 prison_racct_attach(pr); 4966 4967 /* 4968 * Move resource utilisation records. 4969 */ 4970 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4971 4972 #ifdef RCTL 4973 /* 4974 * Force rctl to reattach rules to processes. 4975 */ 4976 FOREACH_PROC_IN_SYSTEM(p) { 4977 PROC_LOCK(p); 4978 cred = crhold(p->p_ucred); 4979 PROC_UNLOCK(p); 4980 rctl_proc_ucred_changed(p, cred); 4981 crfree(cred); 4982 } 4983 #endif 4984 4985 sx_sunlock(&allproc_lock); 4986 prison_racct_free_locked(oldprr); 4987 sx_xunlock(&allprison_lock); 4988 } 4989 4990 static void 4991 prison_racct_detach(struct prison *pr) 4992 { 4993 4994 ASSERT_RACCT_ENABLED(); 4995 sx_assert(&allprison_lock, SA_UNLOCKED); 4996 4997 if (pr->pr_prison_racct == NULL) 4998 return; 4999 prison_racct_free(pr->pr_prison_racct); 5000 pr->pr_prison_racct = NULL; 5001 } 5002 #endif /* RACCT */ 5003 5004 #ifdef DDB 5005 5006 static void 5007 db_show_prison(struct prison *pr) 5008 { 5009 struct bool_flags *bf; 5010 struct jailsys_flags *jsf; 5011 #if defined(INET) || defined(INET6) 5012 int ii; 5013 struct prison_ip *pip; 5014 #endif 5015 unsigned f; 5016 #ifdef INET 5017 char ip4buf[INET_ADDRSTRLEN]; 5018 #endif 5019 #ifdef INET6 5020 char ip6buf[INET6_ADDRSTRLEN]; 5021 #endif 5022 5023 db_printf("prison %p:\n", pr); 5024 db_printf(" jid = %d\n", pr->pr_id); 5025 db_printf(" name = %s\n", pr->pr_name); 5026 db_printf(" parent = %p\n", pr->pr_parent); 5027 db_printf(" ref = %d\n", pr->pr_ref); 5028 db_printf(" uref = %d\n", pr->pr_uref); 5029 db_printf(" state = %s\n", 5030 pr->pr_state == PRISON_STATE_ALIVE ? "alive" : 5031 pr->pr_state == PRISON_STATE_DYING ? "dying" : 5032 "invalid"); 5033 db_printf(" path = %s\n", pr->pr_path); 5034 db_printf(" cpuset = %d\n", pr->pr_cpuset 5035 ? pr->pr_cpuset->cs_id : -1); 5036 #ifdef VIMAGE 5037 db_printf(" vnet = %p\n", pr->pr_vnet); 5038 #endif 5039 db_printf(" root = %p\n", pr->pr_root); 5040 db_printf(" securelevel = %d\n", pr->pr_securelevel); 5041 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 5042 db_printf(" children.max = %d\n", pr->pr_childmax); 5043 db_printf(" children.cur = %d\n", pr->pr_childcount); 5044 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 5045 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 5046 db_printf(" flags = 0x%x", pr->pr_flags); 5047 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++) 5048 if (pr->pr_flags & bf->flag) 5049 db_printf(" %s", bf->name); 5050 for (jsf = pr_flag_jailsys; 5051 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 5052 jsf++) { 5053 f = pr->pr_flags & (jsf->disable | jsf->new); 5054 db_printf(" %-16s= %s\n", jsf->name, 5055 (f != 0 && f == jsf->disable) ? "disable" 5056 : (f == jsf->new) ? "new" 5057 : "inherit"); 5058 } 5059 db_printf(" allow = 0x%x", pr->pr_allow); 5060 for (bf = pr_flag_allow; 5061 bf < pr_flag_allow + nitems(pr_flag_allow) && 5062 atomic_load_int(&bf->flag) != 0; 5063 bf++) 5064 if (pr->pr_allow & bf->flag) 5065 db_printf(" %s", bf->name); 5066 db_printf("\n"); 5067 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 5068 db_printf(" host.hostname = %s\n", pr->pr_hostname); 5069 db_printf(" host.domainname = %s\n", pr->pr_domainname); 5070 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 5071 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 5072 #ifdef INET 5073 if ((pip = pr->pr_addrs[PR_INET]) != NULL) { 5074 db_printf(" ip4s = %d\n", pip->ips); 5075 for (ii = 0; ii < pip->ips; ii++) 5076 db_printf(" %s %s\n", 5077 ii == 0 ? "ip4.addr =" : " ", 5078 inet_ntoa_r( 5079 *(const struct in_addr *)PR_IP(pip, PR_INET, ii), 5080 ip4buf)); 5081 } 5082 #endif 5083 #ifdef INET6 5084 if ((pip = pr->pr_addrs[PR_INET6]) != NULL) { 5085 db_printf(" ip6s = %d\n", pip->ips); 5086 for (ii = 0; ii < pip->ips; ii++) 5087 db_printf(" %s %s\n", 5088 ii == 0 ? "ip6.addr =" : " ", 5089 ip6_sprintf(ip6buf, 5090 (const struct in6_addr *)PR_IP(pip, PR_INET6, ii))); 5091 } 5092 #endif 5093 } 5094 5095 DB_SHOW_COMMAND(prison, db_show_prison_command) 5096 { 5097 struct prison *pr; 5098 5099 if (!have_addr) { 5100 /* 5101 * Show all prisons in the list, and prison0 which is not 5102 * listed. 5103 */ 5104 db_show_prison(&prison0); 5105 if (!db_pager_quit) { 5106 TAILQ_FOREACH(pr, &allprison, pr_list) { 5107 db_show_prison(pr); 5108 if (db_pager_quit) 5109 break; 5110 } 5111 } 5112 return; 5113 } 5114 5115 if (addr == 0) 5116 pr = &prison0; 5117 else { 5118 /* Look for a prison with the ID and with references. */ 5119 TAILQ_FOREACH(pr, &allprison, pr_list) 5120 if (pr->pr_id == addr && pr->pr_ref > 0) 5121 break; 5122 if (pr == NULL) 5123 /* Look again, without requiring a reference. */ 5124 TAILQ_FOREACH(pr, &allprison, pr_list) 5125 if (pr->pr_id == addr) 5126 break; 5127 if (pr == NULL) 5128 /* Assume address points to a valid prison. */ 5129 pr = (struct prison *)addr; 5130 } 5131 db_show_prison(pr); 5132 } 5133 5134 #endif /* DDB */ 5135