1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1999 Poul-Henning Kamp. 5 * Copyright (c) 2008 Bjoern A. Zeeb. 6 * Copyright (c) 2009 James Gritton. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include "opt_ddb.h" 35 #include "opt_inet.h" 36 #include "opt_inet6.h" 37 38 #include <sys/param.h> 39 #include <sys/types.h> 40 #include <sys/kernel.h> 41 #include <sys/systm.h> 42 #include <sys/errno.h> 43 #include <sys/sysproto.h> 44 #include <sys/malloc.h> 45 #include <sys/osd.h> 46 #include <sys/priv.h> 47 #include <sys/proc.h> 48 #include <sys/taskqueue.h> 49 #include <sys/fcntl.h> 50 #include <sys/jail.h> 51 #include <sys/linker.h> 52 #include <sys/lock.h> 53 #include <sys/mutex.h> 54 #include <sys/racct.h> 55 #include <sys/rctl.h> 56 #include <sys/refcount.h> 57 #include <sys/sx.h> 58 #include <sys/sysent.h> 59 #include <sys/namei.h> 60 #include <sys/mount.h> 61 #include <sys/queue.h> 62 #include <sys/socket.h> 63 #include <sys/syscallsubr.h> 64 #include <sys/sysctl.h> 65 #include <sys/uuid.h> 66 #include <sys/vnode.h> 67 68 #include <net/if.h> 69 #include <net/vnet.h> 70 71 #include <netinet/in.h> 72 73 #ifdef DDB 74 #include <ddb/ddb.h> 75 #endif /* DDB */ 76 77 #include <security/mac/mac_framework.h> 78 79 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 80 #define PRISON0_HOSTUUID_MODULE "hostuuid" 81 82 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 83 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 84 85 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 86 #ifdef INET 87 #ifdef INET6 88 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 89 #else 90 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 91 #endif 92 #else /* !INET */ 93 #ifdef INET6 94 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 95 #else 96 #define _PR_IP_SADDRSEL 0 97 #endif 98 #endif 99 100 /* prison0 describes what is "real" about the system. */ 101 struct prison prison0 = { 102 .pr_id = 0, 103 .pr_name = "0", 104 .pr_ref = 1, 105 .pr_uref = 1, 106 .pr_path = "/", 107 .pr_securelevel = -1, 108 .pr_devfs_rsnum = 0, 109 .pr_childmax = JAIL_MAX, 110 .pr_hostuuid = DEFAULT_HOSTUUID, 111 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 112 #ifdef VIMAGE 113 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 114 #else 115 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 116 #endif 117 .pr_allow = PR_ALLOW_ALL_STATIC, 118 }; 119 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 120 121 struct bool_flags { 122 const char *name; 123 const char *noname; 124 volatile u_int flag; 125 }; 126 struct jailsys_flags { 127 const char *name; 128 unsigned disable; 129 unsigned new; 130 }; 131 132 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 133 struct sx allprison_lock; 134 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 135 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 136 LIST_HEAD(, prison_racct) allprison_racct; 137 int lastprid = 0; 138 139 static int get_next_prid(struct prison **insprp); 140 static int do_jail_attach(struct thread *td, struct prison *pr); 141 static void prison_complete(void *context, int pending); 142 static void prison_deref(struct prison *pr, int flags); 143 static void prison_set_allow_locked(struct prison *pr, unsigned flag, 144 int enable); 145 static char *prison_path(struct prison *pr1, struct prison *pr2); 146 static void prison_remove_one(struct prison *pr); 147 #ifdef RACCT 148 static void prison_racct_attach(struct prison *pr); 149 static void prison_racct_modify(struct prison *pr); 150 static void prison_racct_detach(struct prison *pr); 151 #endif 152 153 /* Flags for prison_deref */ 154 #define PD_DEREF 0x01 /* Decrement pr_ref */ 155 #define PD_DEUREF 0x02 /* Decrement pr_uref */ 156 #define PD_LOCKED 0x04 /* pr_mtx is held */ 157 #define PD_LIST_SLOCKED 0x08 /* allprison_lock is held shared */ 158 #define PD_LIST_XLOCKED 0x10 /* allprison_lock is held exclusive */ 159 160 /* 161 * Parameter names corresponding to PR_* flag values. Size values are for kvm 162 * as we cannot figure out the size of a sparse array, or an array without a 163 * terminating entry. 164 */ 165 static struct bool_flags pr_flag_bool[] = { 166 {"persist", "nopersist", PR_PERSIST}, 167 #ifdef INET 168 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL}, 169 #endif 170 #ifdef INET6 171 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL}, 172 #endif 173 }; 174 const size_t pr_flag_bool_size = sizeof(pr_flag_bool); 175 176 static struct jailsys_flags pr_flag_jailsys[] = { 177 {"host", 0, PR_HOST}, 178 #ifdef VIMAGE 179 {"vnet", 0, PR_VNET}, 180 #endif 181 #ifdef INET 182 {"ip4", PR_IP4_USER, PR_IP4_USER}, 183 #endif 184 #ifdef INET6 185 {"ip6", PR_IP6_USER, PR_IP6_USER}, 186 #endif 187 }; 188 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 189 190 /* 191 * Make this array full-size so dynamic parameters can be added. 192 * It is protected by prison0.mtx, but lockless reading is allowed 193 * with an atomic check of the flag values. 194 */ 195 static struct bool_flags pr_flag_allow[NBBY * NBPW] = { 196 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME}, 197 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC}, 198 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS}, 199 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS}, 200 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT}, 201 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS}, 202 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF}, 203 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK}, 204 {"allow.reserved_ports", "allow.noreserved_ports", 205 PR_ALLOW_RESERVED_PORTS}, 206 {"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF}, 207 {"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug", 208 PR_ALLOW_UNPRIV_DEBUG}, 209 {"allow.suser", "allow.nosuser", PR_ALLOW_SUSER}, 210 }; 211 static unsigned pr_allow_all = PR_ALLOW_ALL_STATIC; 212 const size_t pr_flag_allow_size = sizeof(pr_flag_allow); 213 214 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \ 215 PR_ALLOW_RESERVED_PORTS | \ 216 PR_ALLOW_UNPRIV_DEBUG | \ 217 PR_ALLOW_SUSER) 218 #define JAIL_DEFAULT_ENFORCE_STATFS 2 219 #define JAIL_DEFAULT_DEVFS_RSNUM 0 220 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 221 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 222 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 223 #if defined(INET) || defined(INET6) 224 static unsigned jail_max_af_ips = 255; 225 #endif 226 227 /* 228 * Initialize the parts of prison0 that can't be static-initialized with 229 * constants. This is called from proc0_init() after creating thread0 cpuset. 230 */ 231 void 232 prison0_init(void) 233 { 234 uint8_t *file, *data; 235 size_t size; 236 237 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 238 prison0.pr_osreldate = osreldate; 239 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 240 241 /* If we have a preloaded hostuuid, use it. */ 242 file = preload_search_by_type(PRISON0_HOSTUUID_MODULE); 243 if (file != NULL) { 244 data = preload_fetch_addr(file); 245 size = preload_fetch_size(file); 246 if (data != NULL) { 247 /* 248 * The preloaded data may include trailing whitespace, almost 249 * certainly a newline; skip over any whitespace or 250 * non-printable characters to be safe. 251 */ 252 while (size > 0 && data[size - 1] <= 0x20) { 253 data[size--] = '\0'; 254 } 255 if (validate_uuid(data, size, NULL, 0) == 0) { 256 (void)strlcpy(prison0.pr_hostuuid, data, 257 size + 1); 258 } else if (bootverbose) { 259 printf("hostuuid: preload data malformed: '%s'", 260 data); 261 } 262 } 263 } 264 if (bootverbose) 265 printf("hostuuid: using %s\n", prison0.pr_hostuuid); 266 } 267 268 /* 269 * struct jail_args { 270 * struct jail *jail; 271 * }; 272 */ 273 int 274 sys_jail(struct thread *td, struct jail_args *uap) 275 { 276 uint32_t version; 277 int error; 278 struct jail j; 279 280 error = copyin(uap->jail, &version, sizeof(uint32_t)); 281 if (error) 282 return (error); 283 284 switch (version) { 285 case 0: 286 { 287 struct jail_v0 j0; 288 289 /* FreeBSD single IPv4 jails. */ 290 bzero(&j, sizeof(struct jail)); 291 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 292 if (error) 293 return (error); 294 j.version = j0.version; 295 j.path = j0.path; 296 j.hostname = j0.hostname; 297 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 298 break; 299 } 300 301 case 1: 302 /* 303 * Version 1 was used by multi-IPv4 jail implementations 304 * that never made it into the official kernel. 305 */ 306 return (EINVAL); 307 308 case 2: /* JAIL_API_VERSION */ 309 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 310 error = copyin(uap->jail, &j, sizeof(struct jail)); 311 if (error) 312 return (error); 313 break; 314 315 default: 316 /* Sci-Fi jails are not supported, sorry. */ 317 return (EINVAL); 318 } 319 return (kern_jail(td, &j)); 320 } 321 322 int 323 kern_jail(struct thread *td, struct jail *j) 324 { 325 struct iovec optiov[2 * (4 + nitems(pr_flag_allow) 326 #ifdef INET 327 + 1 328 #endif 329 #ifdef INET6 330 + 1 331 #endif 332 )]; 333 struct uio opt; 334 char *u_path, *u_hostname, *u_name; 335 struct bool_flags *bf; 336 #ifdef INET 337 uint32_t ip4s; 338 struct in_addr *u_ip4; 339 #endif 340 #ifdef INET6 341 struct in6_addr *u_ip6; 342 #endif 343 size_t tmplen; 344 int error, enforce_statfs; 345 346 bzero(&optiov, sizeof(optiov)); 347 opt.uio_iov = optiov; 348 opt.uio_iovcnt = 0; 349 opt.uio_offset = -1; 350 opt.uio_resid = -1; 351 opt.uio_segflg = UIO_SYSSPACE; 352 opt.uio_rw = UIO_READ; 353 opt.uio_td = td; 354 355 /* Set permissions for top-level jails from sysctls. */ 356 if (!jailed(td->td_ucred)) { 357 for (bf = pr_flag_allow; 358 bf < pr_flag_allow + nitems(pr_flag_allow) && 359 atomic_load_int(&bf->flag) != 0; 360 bf++) { 361 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *, 362 (jail_default_allow & bf->flag) 363 ? bf->name : bf->noname); 364 optiov[opt.uio_iovcnt].iov_len = 365 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 366 opt.uio_iovcnt += 2; 367 } 368 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 369 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 370 opt.uio_iovcnt++; 371 enforce_statfs = jail_default_enforce_statfs; 372 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 373 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 374 opt.uio_iovcnt++; 375 } 376 377 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 378 #ifdef INET 379 ip4s = (j->version == 0) ? 1 : j->ip4s; 380 if (ip4s > jail_max_af_ips) 381 return (EINVAL); 382 tmplen += ip4s * sizeof(struct in_addr); 383 #else 384 if (j->ip4s > 0) 385 return (EINVAL); 386 #endif 387 #ifdef INET6 388 if (j->ip6s > jail_max_af_ips) 389 return (EINVAL); 390 tmplen += j->ip6s * sizeof(struct in6_addr); 391 #else 392 if (j->ip6s > 0) 393 return (EINVAL); 394 #endif 395 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 396 u_hostname = u_path + MAXPATHLEN; 397 u_name = u_hostname + MAXHOSTNAMELEN; 398 #ifdef INET 399 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 400 #endif 401 #ifdef INET6 402 #ifdef INET 403 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 404 #else 405 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 406 #endif 407 #endif 408 optiov[opt.uio_iovcnt].iov_base = "path"; 409 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 410 opt.uio_iovcnt++; 411 optiov[opt.uio_iovcnt].iov_base = u_path; 412 error = copyinstr(j->path, u_path, MAXPATHLEN, 413 &optiov[opt.uio_iovcnt].iov_len); 414 if (error) { 415 free(u_path, M_TEMP); 416 return (error); 417 } 418 opt.uio_iovcnt++; 419 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 420 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 421 opt.uio_iovcnt++; 422 optiov[opt.uio_iovcnt].iov_base = u_hostname; 423 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 424 &optiov[opt.uio_iovcnt].iov_len); 425 if (error) { 426 free(u_path, M_TEMP); 427 return (error); 428 } 429 opt.uio_iovcnt++; 430 if (j->jailname != NULL) { 431 optiov[opt.uio_iovcnt].iov_base = "name"; 432 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 433 opt.uio_iovcnt++; 434 optiov[opt.uio_iovcnt].iov_base = u_name; 435 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 436 &optiov[opt.uio_iovcnt].iov_len); 437 if (error) { 438 free(u_path, M_TEMP); 439 return (error); 440 } 441 opt.uio_iovcnt++; 442 } 443 #ifdef INET 444 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 445 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 446 opt.uio_iovcnt++; 447 optiov[opt.uio_iovcnt].iov_base = u_ip4; 448 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 449 if (j->version == 0) 450 u_ip4->s_addr = j->ip4s; 451 else { 452 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 453 if (error) { 454 free(u_path, M_TEMP); 455 return (error); 456 } 457 } 458 opt.uio_iovcnt++; 459 #endif 460 #ifdef INET6 461 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 462 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 463 opt.uio_iovcnt++; 464 optiov[opt.uio_iovcnt].iov_base = u_ip6; 465 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 466 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 467 if (error) { 468 free(u_path, M_TEMP); 469 return (error); 470 } 471 opt.uio_iovcnt++; 472 #endif 473 KASSERT(opt.uio_iovcnt <= nitems(optiov), 474 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 475 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 476 free(u_path, M_TEMP); 477 return (error); 478 } 479 480 /* 481 * struct jail_set_args { 482 * struct iovec *iovp; 483 * unsigned int iovcnt; 484 * int flags; 485 * }; 486 */ 487 int 488 sys_jail_set(struct thread *td, struct jail_set_args *uap) 489 { 490 struct uio *auio; 491 int error; 492 493 /* Check that we have an even number of iovecs. */ 494 if (uap->iovcnt & 1) 495 return (EINVAL); 496 497 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 498 if (error) 499 return (error); 500 error = kern_jail_set(td, auio, uap->flags); 501 free(auio, M_IOV); 502 return (error); 503 } 504 505 int 506 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 507 { 508 struct nameidata nd; 509 #ifdef INET 510 struct in_addr *ip4; 511 #endif 512 #ifdef INET6 513 struct in6_addr *ip6; 514 #endif 515 struct vfsopt *opt; 516 struct vfsoptlist *opts; 517 struct prison *pr, *deadpr, *inspr, *mypr, *ppr, *tpr; 518 struct vnode *root; 519 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 520 char *g_path, *osrelstr; 521 struct bool_flags *bf; 522 struct jailsys_flags *jsf; 523 #if defined(INET) || defined(INET6) 524 struct prison *tppr; 525 void *op; 526 #endif 527 unsigned long hid; 528 size_t namelen, onamelen, pnamelen; 529 int born, created, cuflags, descend, drflags, enforce; 530 int error, errmsg_len, errmsg_pos; 531 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 532 int jid, jsys, len, level; 533 int childmax, osreldt, rsnum, slevel; 534 #if defined(INET) || defined(INET6) 535 int ii, ij; 536 #endif 537 #ifdef INET 538 int ip4s, redo_ip4; 539 #endif 540 #ifdef INET6 541 int ip6s, redo_ip6; 542 #endif 543 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 544 uint64_t pr_allow_diff; 545 unsigned tallow; 546 char numbuf[12]; 547 548 error = priv_check(td, PRIV_JAIL_SET); 549 if (!error && (flags & JAIL_ATTACH)) 550 error = priv_check(td, PRIV_JAIL_ATTACH); 551 if (error) 552 return (error); 553 mypr = td->td_ucred->cr_prison; 554 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 555 return (EPERM); 556 if (flags & ~JAIL_SET_MASK) 557 return (EINVAL); 558 559 /* 560 * Check all the parameters before committing to anything. Not all 561 * errors can be caught early, but we may as well try. Also, this 562 * takes care of some expensive stuff (path lookup) before getting 563 * the allprison lock. 564 * 565 * XXX Jails are not filesystems, and jail parameters are not mount 566 * options. But it makes more sense to re-use the vfsopt code 567 * than duplicate it under a different name. 568 */ 569 error = vfs_buildopts(optuio, &opts); 570 if (error) 571 return (error); 572 #ifdef INET 573 ip4 = NULL; 574 #endif 575 #ifdef INET6 576 ip6 = NULL; 577 #endif 578 g_path = NULL; 579 580 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 581 if (!cuflags) { 582 error = EINVAL; 583 vfs_opterror(opts, "no valid operation (create or update)"); 584 goto done_errmsg; 585 } 586 587 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 588 if (error == ENOENT) 589 jid = 0; 590 else if (error != 0) 591 goto done_free; 592 593 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 594 if (error == ENOENT) 595 gotslevel = 0; 596 else if (error != 0) 597 goto done_free; 598 else 599 gotslevel = 1; 600 601 error = 602 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 603 if (error == ENOENT) 604 gotchildmax = 0; 605 else if (error != 0) 606 goto done_free; 607 else 608 gotchildmax = 1; 609 610 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 611 if (error == ENOENT) 612 gotenforce = 0; 613 else if (error != 0) 614 goto done_free; 615 else if (enforce < 0 || enforce > 2) { 616 error = EINVAL; 617 goto done_free; 618 } else 619 gotenforce = 1; 620 621 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 622 if (error == ENOENT) 623 gotrsnum = 0; 624 else if (error != 0) 625 goto done_free; 626 else 627 gotrsnum = 1; 628 629 pr_flags = ch_flags = 0; 630 for (bf = pr_flag_bool; 631 bf < pr_flag_bool + nitems(pr_flag_bool); 632 bf++) { 633 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag); 634 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag); 635 } 636 ch_flags |= pr_flags; 637 for (jsf = pr_flag_jailsys; 638 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 639 jsf++) { 640 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys)); 641 if (error == ENOENT) 642 continue; 643 if (error != 0) 644 goto done_free; 645 switch (jsys) { 646 case JAIL_SYS_DISABLE: 647 if (!jsf->disable) { 648 error = EINVAL; 649 goto done_free; 650 } 651 pr_flags |= jsf->disable; 652 break; 653 case JAIL_SYS_NEW: 654 pr_flags |= jsf->new; 655 break; 656 case JAIL_SYS_INHERIT: 657 break; 658 default: 659 error = EINVAL; 660 goto done_free; 661 } 662 ch_flags |= jsf->new | jsf->disable; 663 } 664 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 665 && !(pr_flags & PR_PERSIST)) { 666 error = EINVAL; 667 vfs_opterror(opts, "new jail must persist or attach"); 668 goto done_errmsg; 669 } 670 #ifdef VIMAGE 671 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 672 error = EINVAL; 673 vfs_opterror(opts, "vnet cannot be changed after creation"); 674 goto done_errmsg; 675 } 676 #endif 677 #ifdef INET 678 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 679 error = EINVAL; 680 vfs_opterror(opts, "ip4 cannot be changed after creation"); 681 goto done_errmsg; 682 } 683 #endif 684 #ifdef INET6 685 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 686 error = EINVAL; 687 vfs_opterror(opts, "ip6 cannot be changed after creation"); 688 goto done_errmsg; 689 } 690 #endif 691 692 pr_allow = ch_allow = 0; 693 for (bf = pr_flag_allow; 694 bf < pr_flag_allow + nitems(pr_flag_allow) && 695 atomic_load_int(&bf->flag) != 0; 696 bf++) { 697 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag); 698 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag); 699 } 700 ch_allow |= pr_allow; 701 702 error = vfs_getopt(opts, "name", (void **)&name, &len); 703 if (error == ENOENT) 704 name = NULL; 705 else if (error != 0) 706 goto done_free; 707 else { 708 if (len == 0 || name[len - 1] != '\0') { 709 error = EINVAL; 710 goto done_free; 711 } 712 if (len > MAXHOSTNAMELEN) { 713 error = ENAMETOOLONG; 714 goto done_free; 715 } 716 } 717 718 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 719 if (error == ENOENT) 720 host = NULL; 721 else if (error != 0) 722 goto done_free; 723 else { 724 ch_flags |= PR_HOST; 725 pr_flags |= PR_HOST; 726 if (len == 0 || host[len - 1] != '\0') { 727 error = EINVAL; 728 goto done_free; 729 } 730 if (len > MAXHOSTNAMELEN) { 731 error = ENAMETOOLONG; 732 goto done_free; 733 } 734 } 735 736 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 737 if (error == ENOENT) 738 domain = NULL; 739 else if (error != 0) 740 goto done_free; 741 else { 742 ch_flags |= PR_HOST; 743 pr_flags |= PR_HOST; 744 if (len == 0 || domain[len - 1] != '\0') { 745 error = EINVAL; 746 goto done_free; 747 } 748 if (len > MAXHOSTNAMELEN) { 749 error = ENAMETOOLONG; 750 goto done_free; 751 } 752 } 753 754 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 755 if (error == ENOENT) 756 uuid = NULL; 757 else if (error != 0) 758 goto done_free; 759 else { 760 ch_flags |= PR_HOST; 761 pr_flags |= PR_HOST; 762 if (len == 0 || uuid[len - 1] != '\0') { 763 error = EINVAL; 764 goto done_free; 765 } 766 if (len > HOSTUUIDLEN) { 767 error = ENAMETOOLONG; 768 goto done_free; 769 } 770 } 771 772 #ifdef COMPAT_FREEBSD32 773 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 774 uint32_t hid32; 775 776 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 777 hid = hid32; 778 } else 779 #endif 780 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 781 if (error == ENOENT) 782 gothid = 0; 783 else if (error != 0) 784 goto done_free; 785 else { 786 gothid = 1; 787 ch_flags |= PR_HOST; 788 pr_flags |= PR_HOST; 789 } 790 791 #ifdef INET 792 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 793 if (error == ENOENT) 794 ip4s = 0; 795 else if (error != 0) 796 goto done_free; 797 else if (ip4s & (sizeof(*ip4) - 1)) { 798 error = EINVAL; 799 goto done_free; 800 } else { 801 ch_flags |= PR_IP4_USER; 802 pr_flags |= PR_IP4_USER; 803 if (ip4s > 0) { 804 ip4s /= sizeof(*ip4); 805 if (ip4s > jail_max_af_ips) { 806 error = EINVAL; 807 vfs_opterror(opts, "too many IPv4 addresses"); 808 goto done_errmsg; 809 } 810 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 811 bcopy(op, ip4, ip4s * sizeof(*ip4)); 812 /* 813 * IP addresses are all sorted but ip[0] to preserve 814 * the primary IP address as given from userland. 815 * This special IP is used for unbound outgoing 816 * connections as well for "loopback" traffic in case 817 * source address selection cannot find any more fitting 818 * address to connect from. 819 */ 820 if (ip4s > 1) 821 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), 822 prison_qcmp_v4); 823 /* 824 * Check for duplicate addresses and do some simple 825 * zero and broadcast checks. If users give other bogus 826 * addresses it is their problem. 827 * 828 * We do not have to care about byte order for these 829 * checks so we will do them in NBO. 830 */ 831 for (ii = 0; ii < ip4s; ii++) { 832 if (ip4[ii].s_addr == INADDR_ANY || 833 ip4[ii].s_addr == INADDR_BROADCAST) { 834 error = EINVAL; 835 goto done_free; 836 } 837 if ((ii+1) < ip4s && 838 (ip4[0].s_addr == ip4[ii+1].s_addr || 839 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 840 error = EINVAL; 841 goto done_free; 842 } 843 } 844 } 845 } 846 #endif 847 848 #ifdef INET6 849 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 850 if (error == ENOENT) 851 ip6s = 0; 852 else if (error != 0) 853 goto done_free; 854 else if (ip6s & (sizeof(*ip6) - 1)) { 855 error = EINVAL; 856 goto done_free; 857 } else { 858 ch_flags |= PR_IP6_USER; 859 pr_flags |= PR_IP6_USER; 860 if (ip6s > 0) { 861 ip6s /= sizeof(*ip6); 862 if (ip6s > jail_max_af_ips) { 863 error = EINVAL; 864 vfs_opterror(opts, "too many IPv6 addresses"); 865 goto done_errmsg; 866 } 867 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 868 bcopy(op, ip6, ip6s * sizeof(*ip6)); 869 if (ip6s > 1) 870 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), 871 prison_qcmp_v6); 872 for (ii = 0; ii < ip6s; ii++) { 873 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 874 error = EINVAL; 875 goto done_free; 876 } 877 if ((ii+1) < ip6s && 878 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 879 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 880 { 881 error = EINVAL; 882 goto done_free; 883 } 884 } 885 } 886 } 887 #endif 888 889 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 890 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 891 error = EINVAL; 892 vfs_opterror(opts, 893 "vnet jails cannot have IP address restrictions"); 894 goto done_errmsg; 895 } 896 #endif 897 898 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 899 if (error == ENOENT) 900 osrelstr = NULL; 901 else if (error != 0) 902 goto done_free; 903 else { 904 if (flags & JAIL_UPDATE) { 905 error = EINVAL; 906 vfs_opterror(opts, 907 "osrelease cannot be changed after creation"); 908 goto done_errmsg; 909 } 910 if (len == 0 || osrelstr[len - 1] != '\0') { 911 error = EINVAL; 912 goto done_free; 913 } 914 if (len >= OSRELEASELEN) { 915 error = ENAMETOOLONG; 916 vfs_opterror(opts, 917 "osrelease string must be 1-%d bytes long", 918 OSRELEASELEN - 1); 919 goto done_errmsg; 920 } 921 } 922 923 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 924 if (error == ENOENT) 925 osreldt = 0; 926 else if (error != 0) 927 goto done_free; 928 else { 929 if (flags & JAIL_UPDATE) { 930 error = EINVAL; 931 vfs_opterror(opts, 932 "osreldate cannot be changed after creation"); 933 goto done_errmsg; 934 } 935 if (osreldt == 0) { 936 error = EINVAL; 937 vfs_opterror(opts, "osreldate cannot be 0"); 938 goto done_errmsg; 939 } 940 } 941 942 root = NULL; 943 error = vfs_getopt(opts, "path", (void **)&path, &len); 944 if (error == ENOENT) 945 path = NULL; 946 else if (error != 0) 947 goto done_free; 948 else { 949 if (flags & JAIL_UPDATE) { 950 error = EINVAL; 951 vfs_opterror(opts, 952 "path cannot be changed after creation"); 953 goto done_errmsg; 954 } 955 if (len == 0 || path[len - 1] != '\0') { 956 error = EINVAL; 957 goto done_free; 958 } 959 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 960 path, td); 961 error = namei(&nd); 962 if (error) 963 goto done_free; 964 root = nd.ni_vp; 965 NDFREE(&nd, NDF_ONLY_PNBUF); 966 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 967 strlcpy(g_path, path, MAXPATHLEN); 968 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 969 if (error == 0) { 970 path = g_path; 971 } else { 972 /* exit on other errors */ 973 goto done_free; 974 } 975 if (root->v_type != VDIR) { 976 error = ENOTDIR; 977 vput(root); 978 goto done_free; 979 } 980 VOP_UNLOCK(root); 981 } 982 983 /* 984 * Find the specified jail, or at least its parent. 985 * This abuses the file error codes ENOENT and EEXIST. 986 */ 987 pr = NULL; 988 ppr = mypr; 989 inspr = NULL; 990 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 991 namelc = strrchr(name, '.'); 992 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 993 if (*p != '\0') 994 jid = 0; 995 } 996 sx_xlock(&allprison_lock); 997 drflags = PD_LIST_XLOCKED; 998 if (jid != 0) { 999 if (jid < 0) { 1000 error = EINVAL; 1001 vfs_opterror(opts, "negative jid"); 1002 goto done_deref; 1003 } 1004 /* 1005 * See if a requested jid already exists. Keep track of 1006 * where it can be inserted later. 1007 */ 1008 TAILQ_FOREACH(inspr, &allprison, pr_list) { 1009 if (inspr->pr_id == jid) { 1010 mtx_lock(&inspr->pr_mtx); 1011 if (prison_isvalid(inspr)) { 1012 pr = inspr; 1013 drflags |= PD_LOCKED; 1014 inspr = NULL; 1015 } else 1016 mtx_unlock(&inspr->pr_mtx); 1017 break; 1018 } 1019 if (inspr->pr_id > jid) 1020 break; 1021 } 1022 if (pr != NULL) { 1023 ppr = pr->pr_parent; 1024 /* Create: jid must not exist. */ 1025 if (cuflags == JAIL_CREATE) { 1026 /* 1027 * Even creators that cannot see the jail will 1028 * get EEXIST. 1029 */ 1030 error = EEXIST; 1031 vfs_opterror(opts, "jail %d already exists", 1032 jid); 1033 goto done_deref; 1034 } 1035 if (!prison_ischild(mypr, pr)) { 1036 /* 1037 * Updaters get ENOENT if they cannot see the 1038 * jail. This is true even for CREATE | UPDATE, 1039 * which normally cannot give this error. 1040 */ 1041 error = ENOENT; 1042 vfs_opterror(opts, "jail %d not found", jid); 1043 goto done_deref; 1044 } else if (!prison_isalive(pr)) { 1045 if (!(flags & JAIL_DYING)) { 1046 error = ENOENT; 1047 vfs_opterror(opts, "jail %d is dying", 1048 jid); 1049 goto done_deref; 1050 } else if ((flags & JAIL_ATTACH) || 1051 (pr_flags & PR_PERSIST)) { 1052 /* 1053 * A dying jail might be resurrected 1054 * (via attach or persist), but first 1055 * it must determine if another jail 1056 * has claimed its name. Accomplish 1057 * this by implicitly re-setting the 1058 * name. 1059 */ 1060 if (name == NULL) 1061 name = prison_name(mypr, pr); 1062 } 1063 } 1064 } else { 1065 /* Update: jid must exist. */ 1066 if (cuflags == JAIL_UPDATE) { 1067 error = ENOENT; 1068 vfs_opterror(opts, "jail %d not found", jid); 1069 goto done_deref; 1070 } 1071 } 1072 } 1073 /* 1074 * If the caller provided a name, look for a jail by that name. 1075 * This has different semantics for creates and updates keyed by jid 1076 * (where the name must not already exist in a different jail), 1077 * and updates keyed by the name itself (where the name must exist 1078 * because that is the jail being updated). 1079 */ 1080 namelc = NULL; 1081 if (name != NULL) { 1082 namelc = strrchr(name, '.'); 1083 if (namelc == NULL) 1084 namelc = name; 1085 else { 1086 /* 1087 * This is a hierarchical name. Split it into the 1088 * parent and child names, and make sure the parent 1089 * exists or matches an already found jail. 1090 */ 1091 if (pr != NULL) { 1092 if (strncmp(name, ppr->pr_name, namelc - name) 1093 || ppr->pr_name[namelc - name] != '\0') { 1094 error = EINVAL; 1095 vfs_opterror(opts, 1096 "cannot change jail's parent"); 1097 goto done_deref; 1098 } 1099 } else { 1100 *namelc = '\0'; 1101 ppr = prison_find_name(mypr, name); 1102 if (ppr == NULL) { 1103 error = ENOENT; 1104 vfs_opterror(opts, 1105 "jail \"%s\" not found", name); 1106 goto done_deref; 1107 } 1108 if (!(flags & JAIL_DYING) && 1109 !prison_isalive(ppr)) { 1110 mtx_unlock(&ppr->pr_mtx); 1111 error = ENOENT; 1112 vfs_opterror(opts, 1113 "jail \"%s\" is dying", name); 1114 goto done_deref; 1115 } 1116 mtx_unlock(&ppr->pr_mtx); 1117 *namelc = '.'; 1118 } 1119 namelc++; 1120 } 1121 if (namelc[0] != '\0') { 1122 pnamelen = 1123 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1124 name_again: 1125 deadpr = NULL; 1126 FOREACH_PRISON_CHILD(ppr, tpr) { 1127 if (tpr != pr && 1128 !strcmp(tpr->pr_name + pnamelen, namelc)) { 1129 mtx_lock(&tpr->pr_mtx); 1130 if (prison_isalive(tpr)) { 1131 if (pr == NULL && 1132 cuflags != JAIL_CREATE) { 1133 /* 1134 * Use this jail 1135 * for updates. 1136 */ 1137 pr = tpr; 1138 drflags |= PD_LOCKED; 1139 break; 1140 } 1141 /* 1142 * Create, or update(jid): 1143 * name must not exist in an 1144 * active sibling jail. 1145 */ 1146 error = EEXIST; 1147 mtx_unlock(&tpr->pr_mtx); 1148 vfs_opterror(opts, 1149 "jail \"%s\" already exists", 1150 name); 1151 goto done_deref; 1152 } 1153 if (pr == NULL && 1154 cuflags != JAIL_CREATE && 1155 prison_isvalid(tpr)) 1156 deadpr = tpr; 1157 mtx_unlock(&tpr->pr_mtx); 1158 } 1159 } 1160 /* If no active jail is found, use a dying one. */ 1161 if (deadpr != NULL && pr == NULL) { 1162 if (flags & JAIL_DYING) { 1163 mtx_lock(&deadpr->pr_mtx); 1164 if (!prison_isvalid(deadpr)) { 1165 mtx_unlock(&deadpr->pr_mtx); 1166 goto name_again; 1167 } 1168 pr = deadpr; 1169 drflags |= PD_LOCKED; 1170 } else if (cuflags == JAIL_UPDATE) { 1171 error = ENOENT; 1172 vfs_opterror(opts, 1173 "jail \"%s\" is dying", name); 1174 goto done_deref; 1175 } 1176 } 1177 /* Update: name must exist if no jid. */ 1178 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1179 error = ENOENT; 1180 vfs_opterror(opts, "jail \"%s\" not found", 1181 name); 1182 goto done_deref; 1183 } 1184 } 1185 } 1186 /* Update: must provide a jid or name. */ 1187 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1188 error = ENOENT; 1189 vfs_opterror(opts, "update specified no jail"); 1190 goto done_deref; 1191 } 1192 1193 /* If there's no prison to update, create a new one and link it in. */ 1194 created = pr == NULL; 1195 if (created) { 1196 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1197 if (tpr->pr_childcount >= tpr->pr_childmax) { 1198 error = EPERM; 1199 vfs_opterror(opts, "prison limit exceeded"); 1200 goto done_deref; 1201 } 1202 mtx_lock(&ppr->pr_mtx); 1203 if (!prison_isvalid(ppr)) { 1204 mtx_unlock(&ppr->pr_mtx); 1205 error = ENOENT; 1206 vfs_opterror(opts, "jail \"%s\" not found", 1207 prison_name(mypr, ppr)); 1208 goto done_deref; 1209 } 1210 prison_hold(ppr); 1211 if (refcount_acquire(&ppr->pr_uref)) 1212 mtx_unlock(&ppr->pr_mtx); 1213 else { 1214 /* This brings the parent back to life. */ 1215 mtx_unlock(&ppr->pr_mtx); 1216 error = osd_jail_call(ppr, PR_METHOD_CREATE, opts); 1217 if (error) { 1218 pr = ppr; 1219 drflags |= PD_DEREF | PD_DEUREF; 1220 goto done_deref; 1221 } 1222 } 1223 1224 if (jid == 0 && (jid = get_next_prid(&inspr)) == 0) { 1225 error = EAGAIN; 1226 vfs_opterror(opts, "no available jail IDs"); 1227 pr = ppr; 1228 drflags |= PD_DEREF | PD_DEUREF; 1229 goto done_deref; 1230 } 1231 1232 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1233 LIST_INIT(&pr->pr_children); 1234 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1235 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1236 1237 pr->pr_id = jid; 1238 if (inspr != NULL) 1239 TAILQ_INSERT_BEFORE(inspr, pr, pr_list); 1240 else 1241 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1242 1243 pr->pr_parent = ppr; 1244 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1245 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1246 tpr->pr_childcount++; 1247 1248 /* Set some default values, and inherit some from the parent. */ 1249 if (namelc == NULL) 1250 namelc = ""; 1251 if (path == NULL) { 1252 path = "/"; 1253 root = mypr->pr_root; 1254 vref(root); 1255 } 1256 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1257 pr->pr_flags |= PR_HOST; 1258 #if defined(INET) || defined(INET6) 1259 #ifdef VIMAGE 1260 if (!(pr_flags & PR_VNET)) 1261 #endif 1262 { 1263 #ifdef INET 1264 if (!(ch_flags & PR_IP4_USER)) 1265 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1266 else if (!(pr_flags & PR_IP4_USER)) { 1267 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1268 if (ppr->pr_ip4 != NULL) { 1269 pr->pr_ip4s = ppr->pr_ip4s; 1270 pr->pr_ip4 = malloc(pr->pr_ip4s * 1271 sizeof(struct in_addr), M_PRISON, 1272 M_WAITOK); 1273 bcopy(ppr->pr_ip4, pr->pr_ip4, 1274 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1275 } 1276 } 1277 #endif 1278 #ifdef INET6 1279 if (!(ch_flags & PR_IP6_USER)) 1280 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1281 else if (!(pr_flags & PR_IP6_USER)) { 1282 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1283 if (ppr->pr_ip6 != NULL) { 1284 pr->pr_ip6s = ppr->pr_ip6s; 1285 pr->pr_ip6 = malloc(pr->pr_ip6s * 1286 sizeof(struct in6_addr), M_PRISON, 1287 M_WAITOK); 1288 bcopy(ppr->pr_ip6, pr->pr_ip6, 1289 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1290 } 1291 } 1292 #endif 1293 } 1294 #endif 1295 /* Source address selection is always on by default. */ 1296 pr->pr_flags |= _PR_IP_SADDRSEL; 1297 1298 pr->pr_securelevel = ppr->pr_securelevel; 1299 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1300 pr->pr_enforce_statfs = jail_default_enforce_statfs; 1301 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1302 1303 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1304 if (osrelstr == NULL) 1305 strlcpy(pr->pr_osrelease, ppr->pr_osrelease, 1306 sizeof(pr->pr_osrelease)); 1307 else 1308 strlcpy(pr->pr_osrelease, osrelstr, 1309 sizeof(pr->pr_osrelease)); 1310 1311 #ifdef VIMAGE 1312 /* Allocate a new vnet if specified. */ 1313 pr->pr_vnet = (pr_flags & PR_VNET) 1314 ? vnet_alloc() : ppr->pr_vnet; 1315 #endif 1316 /* 1317 * Allocate a dedicated cpuset for each jail. 1318 * Unlike other initial settings, this may return an erorr. 1319 */ 1320 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1321 if (error) 1322 goto done_deref; 1323 1324 mtx_lock(&pr->pr_mtx); 1325 drflags |= PD_LOCKED; 1326 /* 1327 * New prisons do not yet have a reference, because we do not 1328 * want others to see the incomplete prison once the 1329 * allprison_lock is downgraded. 1330 */ 1331 } else { 1332 /* 1333 * Grab a reference for existing prisons, to ensure they 1334 * continue to exist for the duration of the call. 1335 */ 1336 prison_hold(pr); 1337 drflags |= PD_DEREF; 1338 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1339 if ((pr->pr_flags & PR_VNET) && 1340 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1341 error = EINVAL; 1342 vfs_opterror(opts, 1343 "vnet jails cannot have IP address restrictions"); 1344 goto done_deref; 1345 } 1346 #endif 1347 #ifdef INET 1348 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1349 error = EINVAL; 1350 vfs_opterror(opts, 1351 "ip4 cannot be changed after creation"); 1352 goto done_deref; 1353 } 1354 #endif 1355 #ifdef INET6 1356 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1357 error = EINVAL; 1358 vfs_opterror(opts, 1359 "ip6 cannot be changed after creation"); 1360 goto done_deref; 1361 } 1362 #endif 1363 } 1364 1365 /* Do final error checking before setting anything. */ 1366 if (gotslevel) { 1367 if (slevel < ppr->pr_securelevel) { 1368 error = EPERM; 1369 goto done_deref; 1370 } 1371 } 1372 if (gotchildmax) { 1373 if (childmax >= ppr->pr_childmax) { 1374 error = EPERM; 1375 goto done_deref; 1376 } 1377 } 1378 if (gotenforce) { 1379 if (enforce < ppr->pr_enforce_statfs) { 1380 error = EPERM; 1381 goto done_deref; 1382 } 1383 } 1384 if (gotrsnum) { 1385 /* 1386 * devfs_rsnum is a uint16_t 1387 */ 1388 if (rsnum < 0 || rsnum > 65535) { 1389 error = EINVAL; 1390 goto done_deref; 1391 } 1392 /* 1393 * Nested jails always inherit parent's devfs ruleset 1394 */ 1395 if (jailed(td->td_ucred)) { 1396 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1397 error = EPERM; 1398 goto done_deref; 1399 } else 1400 rsnum = ppr->pr_devfs_rsnum; 1401 } 1402 } 1403 #ifdef INET 1404 if (ip4s > 0) { 1405 if (ppr->pr_flags & PR_IP4) { 1406 /* 1407 * Make sure the new set of IP addresses is a 1408 * subset of the parent's list. Don't worry 1409 * about the parent being unlocked, as any 1410 * setting is done with allprison_lock held. 1411 */ 1412 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1413 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1414 break; 1415 if (ij == ppr->pr_ip4s) { 1416 error = EPERM; 1417 goto done_deref; 1418 } 1419 if (ip4s > 1) { 1420 for (ii = ij = 1; ii < ip4s; ii++) { 1421 if (ip4[ii].s_addr == 1422 ppr->pr_ip4[0].s_addr) 1423 continue; 1424 for (; ij < ppr->pr_ip4s; ij++) 1425 if (ip4[ii].s_addr == 1426 ppr->pr_ip4[ij].s_addr) 1427 break; 1428 if (ij == ppr->pr_ip4s) 1429 break; 1430 } 1431 if (ij == ppr->pr_ip4s) { 1432 error = EPERM; 1433 goto done_deref; 1434 } 1435 } 1436 } 1437 /* 1438 * Check for conflicting IP addresses. We permit them 1439 * if there is no more than one IP on each jail. If 1440 * there is a duplicate on a jail with more than one 1441 * IP stop checking and return error. 1442 */ 1443 #ifdef VIMAGE 1444 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1445 if (tppr->pr_flags & PR_VNET) 1446 break; 1447 #else 1448 tppr = &prison0; 1449 #endif 1450 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1451 if (tpr == pr || 1452 #ifdef VIMAGE 1453 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1454 #endif 1455 refcount_load(&tpr->pr_uref) == 0) { 1456 descend = 0; 1457 continue; 1458 } 1459 if (!(tpr->pr_flags & PR_IP4_USER)) 1460 continue; 1461 descend = 0; 1462 if (tpr->pr_ip4 == NULL || 1463 (ip4s == 1 && tpr->pr_ip4s == 1)) 1464 continue; 1465 for (ii = 0; ii < ip4s; ii++) { 1466 if (prison_check_ip4_locked(tpr, &ip4[ii]) == 1467 0) { 1468 error = EADDRINUSE; 1469 vfs_opterror(opts, 1470 "IPv4 addresses clash"); 1471 goto done_deref; 1472 } 1473 } 1474 } 1475 } 1476 #endif 1477 #ifdef INET6 1478 if (ip6s > 0) { 1479 if (ppr->pr_flags & PR_IP6) { 1480 /* 1481 * Make sure the new set of IP addresses is a 1482 * subset of the parent's list. 1483 */ 1484 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1485 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1486 &ppr->pr_ip6[ij])) 1487 break; 1488 if (ij == ppr->pr_ip6s) { 1489 error = EPERM; 1490 goto done_deref; 1491 } 1492 if (ip6s > 1) { 1493 for (ii = ij = 1; ii < ip6s; ii++) { 1494 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1495 &ppr->pr_ip6[0])) 1496 continue; 1497 for (; ij < ppr->pr_ip6s; ij++) 1498 if (IN6_ARE_ADDR_EQUAL( 1499 &ip6[ii], &ppr->pr_ip6[ij])) 1500 break; 1501 if (ij == ppr->pr_ip6s) 1502 break; 1503 } 1504 if (ij == ppr->pr_ip6s) { 1505 error = EPERM; 1506 goto done_deref; 1507 } 1508 } 1509 } 1510 /* Check for conflicting IP addresses. */ 1511 #ifdef VIMAGE 1512 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1513 if (tppr->pr_flags & PR_VNET) 1514 break; 1515 #else 1516 tppr = &prison0; 1517 #endif 1518 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1519 if (tpr == pr || 1520 #ifdef VIMAGE 1521 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1522 #endif 1523 refcount_load(&tpr->pr_uref) == 0) { 1524 descend = 0; 1525 continue; 1526 } 1527 if (!(tpr->pr_flags & PR_IP6_USER)) 1528 continue; 1529 descend = 0; 1530 if (tpr->pr_ip6 == NULL || 1531 (ip6s == 1 && tpr->pr_ip6s == 1)) 1532 continue; 1533 for (ii = 0; ii < ip6s; ii++) { 1534 if (prison_check_ip6_locked(tpr, &ip6[ii]) == 1535 0) { 1536 error = EADDRINUSE; 1537 vfs_opterror(opts, 1538 "IPv6 addresses clash"); 1539 goto done_deref; 1540 } 1541 } 1542 } 1543 } 1544 #endif 1545 onamelen = namelen = 0; 1546 if (namelc != NULL) { 1547 /* Give a default name of the jid. Also allow the name to be 1548 * explicitly the jid - but not any other number, and only in 1549 * normal form (no leading zero/etc). 1550 */ 1551 if (namelc[0] == '\0') 1552 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 1553 else if ((strtoul(namelc, &p, 10) != jid || 1554 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1555 error = EINVAL; 1556 vfs_opterror(opts, 1557 "name cannot be numeric (unless it is the jid)"); 1558 goto done_deref; 1559 } 1560 /* 1561 * Make sure the name isn't too long for the prison or its 1562 * children. 1563 */ 1564 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1565 onamelen = strlen(pr->pr_name + pnamelen); 1566 namelen = strlen(namelc); 1567 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1568 error = ENAMETOOLONG; 1569 goto done_deref; 1570 } 1571 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1572 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1573 sizeof(pr->pr_name)) { 1574 error = ENAMETOOLONG; 1575 goto done_deref; 1576 } 1577 } 1578 } 1579 pr_allow_diff = pr_allow & ~ppr->pr_allow; 1580 if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) { 1581 error = EPERM; 1582 goto done_deref; 1583 } 1584 1585 /* 1586 * Let modules check their parameters. This requires unlocking and 1587 * then re-locking the prison, but this is still a valid state as long 1588 * as allprison_lock remains xlocked. 1589 */ 1590 mtx_unlock(&pr->pr_mtx); 1591 drflags &= ~PD_LOCKED; 1592 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1593 if (error != 0) 1594 goto done_deref; 1595 mtx_lock(&pr->pr_mtx); 1596 drflags |= PD_LOCKED; 1597 1598 /* At this point, all valid parameters should have been noted. */ 1599 TAILQ_FOREACH(opt, opts, link) { 1600 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1601 error = EINVAL; 1602 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1603 goto done_deref; 1604 } 1605 } 1606 1607 /* Set the parameters of the prison. */ 1608 #ifdef INET 1609 redo_ip4 = 0; 1610 if (pr_flags & PR_IP4_USER) { 1611 pr->pr_flags |= PR_IP4; 1612 free(pr->pr_ip4, M_PRISON); 1613 pr->pr_ip4s = ip4s; 1614 pr->pr_ip4 = ip4; 1615 ip4 = NULL; 1616 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1617 #ifdef VIMAGE 1618 if (tpr->pr_flags & PR_VNET) { 1619 descend = 0; 1620 continue; 1621 } 1622 #endif 1623 if (prison_restrict_ip4(tpr, NULL)) { 1624 redo_ip4 = 1; 1625 descend = 0; 1626 } 1627 } 1628 } 1629 #endif 1630 #ifdef INET6 1631 redo_ip6 = 0; 1632 if (pr_flags & PR_IP6_USER) { 1633 pr->pr_flags |= PR_IP6; 1634 free(pr->pr_ip6, M_PRISON); 1635 pr->pr_ip6s = ip6s; 1636 pr->pr_ip6 = ip6; 1637 ip6 = NULL; 1638 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1639 #ifdef VIMAGE 1640 if (tpr->pr_flags & PR_VNET) { 1641 descend = 0; 1642 continue; 1643 } 1644 #endif 1645 if (prison_restrict_ip6(tpr, NULL)) { 1646 redo_ip6 = 1; 1647 descend = 0; 1648 } 1649 } 1650 } 1651 #endif 1652 if (gotslevel) { 1653 pr->pr_securelevel = slevel; 1654 /* Set all child jails to be at least this level. */ 1655 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1656 if (tpr->pr_securelevel < slevel) 1657 tpr->pr_securelevel = slevel; 1658 } 1659 if (gotchildmax) { 1660 pr->pr_childmax = childmax; 1661 /* Set all child jails to under this limit. */ 1662 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1663 if (tpr->pr_childmax > childmax - level) 1664 tpr->pr_childmax = childmax > level 1665 ? childmax - level : 0; 1666 } 1667 if (gotenforce) { 1668 pr->pr_enforce_statfs = enforce; 1669 /* Pass this restriction on to the children. */ 1670 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1671 if (tpr->pr_enforce_statfs < enforce) 1672 tpr->pr_enforce_statfs = enforce; 1673 } 1674 if (gotrsnum) { 1675 pr->pr_devfs_rsnum = rsnum; 1676 /* Pass this restriction on to the children. */ 1677 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1678 tpr->pr_devfs_rsnum = rsnum; 1679 } 1680 if (namelc != NULL) { 1681 if (ppr == &prison0) 1682 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1683 else 1684 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1685 ppr->pr_name, namelc); 1686 /* Change this component of child names. */ 1687 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1688 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1689 strlen(tpr->pr_name + onamelen) + 1); 1690 bcopy(pr->pr_name, tpr->pr_name, namelen); 1691 } 1692 } 1693 if (path != NULL) { 1694 /* Try to keep a real-rooted full pathname. */ 1695 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1696 pr->pr_root = root; 1697 root = NULL; 1698 } 1699 if (PR_HOST & ch_flags & ~pr_flags) { 1700 if (pr->pr_flags & PR_HOST) { 1701 /* 1702 * Copy the parent's host info. As with pr_ip4 above, 1703 * the lack of a lock on the parent is not a problem; 1704 * it is always set with allprison_lock at least 1705 * shared, and is held exclusively here. 1706 */ 1707 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1708 sizeof(pr->pr_hostname)); 1709 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1710 sizeof(pr->pr_domainname)); 1711 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1712 sizeof(pr->pr_hostuuid)); 1713 pr->pr_hostid = pr->pr_parent->pr_hostid; 1714 } 1715 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1716 /* Set this prison, and any descendants without PR_HOST. */ 1717 if (host != NULL) 1718 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1719 if (domain != NULL) 1720 strlcpy(pr->pr_domainname, domain, 1721 sizeof(pr->pr_domainname)); 1722 if (uuid != NULL) 1723 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1724 if (gothid) 1725 pr->pr_hostid = hid; 1726 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1727 if (tpr->pr_flags & PR_HOST) 1728 descend = 0; 1729 else { 1730 if (host != NULL) 1731 strlcpy(tpr->pr_hostname, 1732 pr->pr_hostname, 1733 sizeof(tpr->pr_hostname)); 1734 if (domain != NULL) 1735 strlcpy(tpr->pr_domainname, 1736 pr->pr_domainname, 1737 sizeof(tpr->pr_domainname)); 1738 if (uuid != NULL) 1739 strlcpy(tpr->pr_hostuuid, 1740 pr->pr_hostuuid, 1741 sizeof(tpr->pr_hostuuid)); 1742 if (gothid) 1743 tpr->pr_hostid = hid; 1744 } 1745 } 1746 } 1747 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1748 if ((tallow = ch_allow & ~pr_allow)) 1749 prison_set_allow_locked(pr, tallow, 0); 1750 /* 1751 * Persistent prisons get an extra reference, and prisons losing their 1752 * persist flag lose that reference. Only do this for existing prisons 1753 * for now, so new ones will remain unseen until after the module 1754 * handlers have completed. 1755 */ 1756 born = !prison_isalive(pr); 1757 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1758 if (pr_flags & PR_PERSIST) { 1759 prison_hold(pr); 1760 refcount_acquire(&pr->pr_uref); 1761 } else { 1762 refcount_release(&pr->pr_ref); 1763 drflags |= PD_DEUREF; 1764 } 1765 } 1766 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1767 mtx_unlock(&pr->pr_mtx); 1768 drflags &= ~PD_LOCKED; 1769 1770 #ifdef RACCT 1771 if (racct_enable && created) 1772 prison_racct_attach(pr); 1773 #endif 1774 1775 /* Locks may have prevented a complete restriction of child IP 1776 * addresses. If so, allocate some more memory and try again. 1777 */ 1778 #ifdef INET 1779 while (redo_ip4) { 1780 ip4s = pr->pr_ip4s; 1781 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1782 mtx_lock(&pr->pr_mtx); 1783 redo_ip4 = 0; 1784 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1785 #ifdef VIMAGE 1786 if (tpr->pr_flags & PR_VNET) { 1787 descend = 0; 1788 continue; 1789 } 1790 #endif 1791 if (prison_restrict_ip4(tpr, ip4)) { 1792 if (ip4 != NULL) 1793 ip4 = NULL; 1794 else 1795 redo_ip4 = 1; 1796 } 1797 } 1798 mtx_unlock(&pr->pr_mtx); 1799 } 1800 #endif 1801 #ifdef INET6 1802 while (redo_ip6) { 1803 ip6s = pr->pr_ip6s; 1804 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1805 mtx_lock(&pr->pr_mtx); 1806 redo_ip6 = 0; 1807 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1808 #ifdef VIMAGE 1809 if (tpr->pr_flags & PR_VNET) { 1810 descend = 0; 1811 continue; 1812 } 1813 #endif 1814 if (prison_restrict_ip6(tpr, ip6)) { 1815 if (ip6 != NULL) 1816 ip6 = NULL; 1817 else 1818 redo_ip6 = 1; 1819 } 1820 } 1821 mtx_unlock(&pr->pr_mtx); 1822 } 1823 #endif 1824 1825 /* Let the modules do their work. */ 1826 sx_downgrade(&allprison_lock); 1827 drflags = (drflags & ~PD_LIST_XLOCKED) | PD_LIST_SLOCKED; 1828 if (born) { 1829 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1830 if (error) { 1831 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1832 goto done_deref; 1833 } 1834 } 1835 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1836 if (error) { 1837 if (born) 1838 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1839 goto done_deref; 1840 } 1841 1842 /* Attach this process to the prison if requested. */ 1843 if (flags & JAIL_ATTACH) { 1844 mtx_lock(&pr->pr_mtx); 1845 error = do_jail_attach(td, pr); 1846 drflags &= ~PD_LIST_SLOCKED; 1847 if (error) { 1848 if (created) { 1849 /* do_jail_attach has removed the prison. */ 1850 pr = NULL; 1851 } 1852 vfs_opterror(opts, "attach failed"); 1853 goto done_deref; 1854 } 1855 } 1856 1857 #ifdef RACCT 1858 if (racct_enable && !created) { 1859 if (drflags & PD_LIST_SLOCKED) { 1860 sx_sunlock(&allprison_lock); 1861 drflags &= ~PD_LIST_SLOCKED; 1862 } 1863 prison_racct_modify(pr); 1864 } 1865 #endif 1866 1867 td->td_retval[0] = pr->pr_id; 1868 1869 if (created) { 1870 /* 1871 * Add a reference to newly created persistent prisons 1872 * (which was not done earlier so that the prison would 1873 * not be publicly visible). 1874 */ 1875 if (pr_flags & PR_PERSIST) { 1876 mtx_lock(&pr->pr_mtx); 1877 drflags |= PD_LOCKED; 1878 refcount_acquire(&pr->pr_ref); 1879 refcount_acquire(&pr->pr_uref); 1880 } else { 1881 /* Non-persistent jails need no further changes. */ 1882 pr = NULL; 1883 } 1884 } 1885 1886 done_deref: 1887 /* Release any temporary prison holds and/or locks. */ 1888 if (pr != NULL) 1889 prison_deref(pr, drflags); 1890 else if (drflags & PD_LIST_SLOCKED) 1891 sx_sunlock(&allprison_lock); 1892 else if (drflags & PD_LIST_XLOCKED) 1893 sx_xunlock(&allprison_lock); 1894 if (root != NULL) 1895 vrele(root); 1896 done_errmsg: 1897 if (error) { 1898 /* Write the error message back to userspace. */ 1899 if (vfs_getopt(opts, "errmsg", (void **)&errmsg, 1900 &errmsg_len) == 0 && errmsg_len > 0) { 1901 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1902 if (optuio->uio_segflg == UIO_SYSSPACE) 1903 bcopy(errmsg, 1904 optuio->uio_iov[errmsg_pos].iov_base, 1905 errmsg_len); 1906 else 1907 copyout(errmsg, 1908 optuio->uio_iov[errmsg_pos].iov_base, 1909 errmsg_len); 1910 } 1911 } 1912 done_free: 1913 #ifdef INET 1914 free(ip4, M_PRISON); 1915 #endif 1916 #ifdef INET6 1917 free(ip6, M_PRISON); 1918 #endif 1919 if (g_path != NULL) 1920 free(g_path, M_TEMP); 1921 vfs_freeopts(opts); 1922 return (error); 1923 } 1924 1925 /* 1926 * Find the next available prison ID. Return the ID on success, or zero 1927 * on failure. Also set a pointer to the allprison list entry the prison 1928 * should be inserted before. 1929 */ 1930 static int 1931 get_next_prid(struct prison **insprp) 1932 { 1933 struct prison *inspr; 1934 int jid, maxid; 1935 1936 jid = lastprid % JAIL_MAX + 1; 1937 if (TAILQ_EMPTY(&allprison) || 1938 TAILQ_LAST(&allprison, prisonlist)->pr_id < jid) { 1939 /* 1940 * A common case is for all jails to be implicitly numbered, 1941 * which means they'll go on the end of the list, at least 1942 * for the first JAIL_MAX times. 1943 */ 1944 inspr = NULL; 1945 } else { 1946 /* 1947 * Take two passes through the allprison list: first starting 1948 * with the proposed jid, then ending with it. 1949 */ 1950 for (maxid = JAIL_MAX; maxid != 0; ) { 1951 TAILQ_FOREACH(inspr, &allprison, pr_list) { 1952 if (inspr->pr_id < jid) 1953 continue; 1954 if (inspr->pr_id > jid || 1955 refcount_load(&inspr->pr_ref) == 0) { 1956 /* 1957 * Found an opening. This may be a gap 1958 * in the list, or a dead jail with the 1959 * same ID. 1960 */ 1961 maxid = 0; 1962 break; 1963 } 1964 if (++jid > maxid) { 1965 if (lastprid == maxid || lastprid == 0) 1966 { 1967 /* 1968 * The entire legal range 1969 * has been traversed 1970 */ 1971 return 0; 1972 } 1973 /* Try again from the start. */ 1974 jid = 1; 1975 maxid = lastprid; 1976 break; 1977 } 1978 } 1979 if (inspr == NULL) { 1980 /* Found room at the end of the list. */ 1981 break; 1982 } 1983 } 1984 } 1985 *insprp = inspr; 1986 lastprid = jid; 1987 return (jid); 1988 } 1989 1990 /* 1991 * struct jail_get_args { 1992 * struct iovec *iovp; 1993 * unsigned int iovcnt; 1994 * int flags; 1995 * }; 1996 */ 1997 int 1998 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1999 { 2000 struct uio *auio; 2001 int error; 2002 2003 /* Check that we have an even number of iovecs. */ 2004 if (uap->iovcnt & 1) 2005 return (EINVAL); 2006 2007 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 2008 if (error) 2009 return (error); 2010 error = kern_jail_get(td, auio, uap->flags); 2011 if (error == 0) 2012 error = copyout(auio->uio_iov, uap->iovp, 2013 uap->iovcnt * sizeof (struct iovec)); 2014 free(auio, M_IOV); 2015 return (error); 2016 } 2017 2018 int 2019 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 2020 { 2021 struct bool_flags *bf; 2022 struct jailsys_flags *jsf; 2023 struct prison *pr, *mypr; 2024 struct vfsopt *opt; 2025 struct vfsoptlist *opts; 2026 char *errmsg, *name; 2027 int drflags, error, errmsg_len, errmsg_pos, i, jid, len, pos; 2028 unsigned f; 2029 2030 if (flags & ~JAIL_GET_MASK) 2031 return (EINVAL); 2032 2033 /* Get the parameter list. */ 2034 error = vfs_buildopts(optuio, &opts); 2035 if (error) 2036 return (error); 2037 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 2038 mypr = td->td_ucred->cr_prison; 2039 pr = NULL; 2040 2041 /* 2042 * Find the prison specified by one of: lastjid, jid, name. 2043 */ 2044 sx_slock(&allprison_lock); 2045 drflags = PD_LIST_SLOCKED; 2046 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 2047 if (error == 0) { 2048 TAILQ_FOREACH(pr, &allprison, pr_list) { 2049 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 2050 mtx_lock(&pr->pr_mtx); 2051 if ((flags & JAIL_DYING) 2052 ? prison_isvalid(pr) : prison_isalive(pr)) 2053 break; 2054 mtx_unlock(&pr->pr_mtx); 2055 } 2056 } 2057 if (pr != NULL) { 2058 drflags |= PD_LOCKED; 2059 goto found_prison; 2060 } 2061 error = ENOENT; 2062 vfs_opterror(opts, "no jail after %d", jid); 2063 goto done; 2064 } else if (error != ENOENT) 2065 goto done; 2066 2067 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 2068 if (error == 0) { 2069 if (jid != 0) { 2070 pr = prison_find_child(mypr, jid); 2071 if (pr != NULL) { 2072 drflags |= PD_LOCKED; 2073 if (!(prison_isalive(pr) || 2074 (flags & JAIL_DYING))) { 2075 error = ENOENT; 2076 vfs_opterror(opts, "jail %d is dying", 2077 jid); 2078 goto done; 2079 } 2080 goto found_prison; 2081 } 2082 error = ENOENT; 2083 vfs_opterror(opts, "jail %d not found", jid); 2084 goto done; 2085 } 2086 } else if (error != ENOENT) 2087 goto done; 2088 2089 error = vfs_getopt(opts, "name", (void **)&name, &len); 2090 if (error == 0) { 2091 if (len == 0 || name[len - 1] != '\0') { 2092 error = EINVAL; 2093 goto done; 2094 } 2095 pr = prison_find_name(mypr, name); 2096 if (pr != NULL) { 2097 drflags |= PD_LOCKED; 2098 if (!(prison_isalive(pr) || (flags & JAIL_DYING))) { 2099 error = ENOENT; 2100 vfs_opterror(opts, "jail \"%s\" is dying", 2101 name); 2102 goto done; 2103 } 2104 goto found_prison; 2105 } 2106 error = ENOENT; 2107 vfs_opterror(opts, "jail \"%s\" not found", name); 2108 goto done; 2109 } else if (error != ENOENT) 2110 goto done; 2111 2112 vfs_opterror(opts, "no jail specified"); 2113 error = ENOENT; 2114 goto done; 2115 2116 found_prison: 2117 /* Get the parameters of the prison. */ 2118 prison_hold(pr); 2119 drflags |= PD_DEREF; 2120 td->td_retval[0] = pr->pr_id; 2121 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2122 if (error != 0 && error != ENOENT) 2123 goto done; 2124 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2125 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2126 if (error != 0 && error != ENOENT) 2127 goto done; 2128 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2129 if (error != 0 && error != ENOENT) 2130 goto done; 2131 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2132 sizeof(pr->pr_cpuset->cs_id)); 2133 if (error != 0 && error != ENOENT) 2134 goto done; 2135 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2136 if (error != 0 && error != ENOENT) 2137 goto done; 2138 #ifdef INET 2139 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2140 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2141 if (error != 0 && error != ENOENT) 2142 goto done; 2143 #endif 2144 #ifdef INET6 2145 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2146 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2147 if (error != 0 && error != ENOENT) 2148 goto done; 2149 #endif 2150 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2151 sizeof(pr->pr_securelevel)); 2152 if (error != 0 && error != ENOENT) 2153 goto done; 2154 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2155 sizeof(pr->pr_childcount)); 2156 if (error != 0 && error != ENOENT) 2157 goto done; 2158 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2159 sizeof(pr->pr_childmax)); 2160 if (error != 0 && error != ENOENT) 2161 goto done; 2162 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2163 if (error != 0 && error != ENOENT) 2164 goto done; 2165 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2166 if (error != 0 && error != ENOENT) 2167 goto done; 2168 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2169 if (error != 0 && error != ENOENT) 2170 goto done; 2171 #ifdef COMPAT_FREEBSD32 2172 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2173 uint32_t hid32 = pr->pr_hostid; 2174 2175 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2176 } else 2177 #endif 2178 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2179 sizeof(pr->pr_hostid)); 2180 if (error != 0 && error != ENOENT) 2181 goto done; 2182 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2183 sizeof(pr->pr_enforce_statfs)); 2184 if (error != 0 && error != ENOENT) 2185 goto done; 2186 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2187 sizeof(pr->pr_devfs_rsnum)); 2188 if (error != 0 && error != ENOENT) 2189 goto done; 2190 for (bf = pr_flag_bool; 2191 bf < pr_flag_bool + nitems(pr_flag_bool); 2192 bf++) { 2193 i = (pr->pr_flags & bf->flag) ? 1 : 0; 2194 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2195 if (error != 0 && error != ENOENT) 2196 goto done; 2197 i = !i; 2198 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2199 if (error != 0 && error != ENOENT) 2200 goto done; 2201 } 2202 for (jsf = pr_flag_jailsys; 2203 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 2204 jsf++) { 2205 f = pr->pr_flags & (jsf->disable | jsf->new); 2206 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE 2207 : (f == jsf->new) ? JAIL_SYS_NEW 2208 : JAIL_SYS_INHERIT; 2209 error = vfs_setopt(opts, jsf->name, &i, sizeof(i)); 2210 if (error != 0 && error != ENOENT) 2211 goto done; 2212 } 2213 for (bf = pr_flag_allow; 2214 bf < pr_flag_allow + nitems(pr_flag_allow) && 2215 atomic_load_int(&bf->flag) != 0; 2216 bf++) { 2217 i = (pr->pr_allow & bf->flag) ? 1 : 0; 2218 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2219 if (error != 0 && error != ENOENT) 2220 goto done; 2221 i = !i; 2222 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2223 if (error != 0 && error != ENOENT) 2224 goto done; 2225 } 2226 i = !prison_isalive(pr); 2227 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2228 if (error != 0 && error != ENOENT) 2229 goto done; 2230 i = !i; 2231 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2232 if (error != 0 && error != ENOENT) 2233 goto done; 2234 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2235 sizeof(pr->pr_osreldate)); 2236 if (error != 0 && error != ENOENT) 2237 goto done; 2238 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2239 if (error != 0 && error != ENOENT) 2240 goto done; 2241 2242 /* Get the module parameters. */ 2243 mtx_unlock(&pr->pr_mtx); 2244 drflags &= ~PD_LOCKED; 2245 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2246 if (error) 2247 goto done; 2248 prison_deref(pr, drflags); 2249 pr = NULL; 2250 drflags = 0; 2251 2252 /* By now, all parameters should have been noted. */ 2253 TAILQ_FOREACH(opt, opts, link) { 2254 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2255 error = EINVAL; 2256 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2257 goto done; 2258 } 2259 } 2260 2261 /* Write the fetched parameters back to userspace. */ 2262 error = 0; 2263 TAILQ_FOREACH(opt, opts, link) { 2264 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2265 pos = 2 * opt->pos + 1; 2266 optuio->uio_iov[pos].iov_len = opt->len; 2267 if (opt->value != NULL) { 2268 if (optuio->uio_segflg == UIO_SYSSPACE) { 2269 bcopy(opt->value, 2270 optuio->uio_iov[pos].iov_base, 2271 opt->len); 2272 } else { 2273 error = copyout(opt->value, 2274 optuio->uio_iov[pos].iov_base, 2275 opt->len); 2276 if (error) 2277 break; 2278 } 2279 } 2280 } 2281 } 2282 2283 done: 2284 /* Release any temporary prison holds and/or locks. */ 2285 if (pr != NULL) 2286 prison_deref(pr, drflags); 2287 else if (drflags & PD_LIST_SLOCKED) 2288 sx_sunlock(&allprison_lock); 2289 if (error && errmsg_pos >= 0) { 2290 /* Write the error message back to userspace. */ 2291 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2292 errmsg_pos = 2 * errmsg_pos + 1; 2293 if (errmsg_len > 0) { 2294 if (optuio->uio_segflg == UIO_SYSSPACE) 2295 bcopy(errmsg, 2296 optuio->uio_iov[errmsg_pos].iov_base, 2297 errmsg_len); 2298 else 2299 copyout(errmsg, 2300 optuio->uio_iov[errmsg_pos].iov_base, 2301 errmsg_len); 2302 } 2303 } 2304 vfs_freeopts(opts); 2305 return (error); 2306 } 2307 2308 /* 2309 * struct jail_remove_args { 2310 * int jid; 2311 * }; 2312 */ 2313 int 2314 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2315 { 2316 struct prison *pr, *cpr, *lpr, *tpr; 2317 int descend, error; 2318 2319 error = priv_check(td, PRIV_JAIL_REMOVE); 2320 if (error) 2321 return (error); 2322 2323 sx_xlock(&allprison_lock); 2324 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2325 if (pr == NULL) { 2326 sx_xunlock(&allprison_lock); 2327 return (EINVAL); 2328 } 2329 2330 /* Remove all descendants of this prison, then remove this prison. */ 2331 prison_hold(pr); 2332 if (!LIST_EMPTY(&pr->pr_children)) { 2333 mtx_unlock(&pr->pr_mtx); 2334 lpr = NULL; 2335 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2336 mtx_lock(&cpr->pr_mtx); 2337 if (prison_isvalid(cpr)) { 2338 tpr = cpr; 2339 prison_hold(cpr); 2340 } else { 2341 /* Already removed - do not do it again. */ 2342 tpr = NULL; 2343 } 2344 mtx_unlock(&cpr->pr_mtx); 2345 if (lpr != NULL) { 2346 mtx_lock(&lpr->pr_mtx); 2347 prison_remove_one(lpr); 2348 sx_xlock(&allprison_lock); 2349 } 2350 lpr = tpr; 2351 } 2352 if (lpr != NULL) { 2353 mtx_lock(&lpr->pr_mtx); 2354 prison_remove_one(lpr); 2355 sx_xlock(&allprison_lock); 2356 } 2357 mtx_lock(&pr->pr_mtx); 2358 } 2359 prison_remove_one(pr); 2360 return (0); 2361 } 2362 2363 static void 2364 prison_remove_one(struct prison *pr) 2365 { 2366 struct proc *p; 2367 int drflags; 2368 2369 drflags = PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED; 2370 2371 /* If the prison was persistent, it is not anymore. */ 2372 if (pr->pr_flags & PR_PERSIST) { 2373 refcount_release(&pr->pr_ref); 2374 drflags |= PD_DEUREF; 2375 pr->pr_flags &= ~PR_PERSIST; 2376 } 2377 2378 /* 2379 * jail_remove added a reference. If that's the only one, remove 2380 * the prison now. refcount(9) doesn't guarantee the cache coherence 2381 * of non-zero counters, so force it here. 2382 */ 2383 KASSERT(refcount_load(&pr->pr_ref) > 0, 2384 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2385 if (atomic_load_acq_int(&pr->pr_ref) == 1) { 2386 prison_deref(pr, drflags); 2387 return; 2388 } 2389 2390 mtx_unlock(&pr->pr_mtx); 2391 sx_xunlock(&allprison_lock); 2392 drflags &= ~(PD_LOCKED | PD_LIST_XLOCKED); 2393 /* 2394 * Kill all processes unfortunate enough to be attached to this prison. 2395 */ 2396 sx_slock(&allproc_lock); 2397 FOREACH_PROC_IN_SYSTEM(p) { 2398 PROC_LOCK(p); 2399 if (p->p_state != PRS_NEW && p->p_ucred && 2400 p->p_ucred->cr_prison == pr) 2401 kern_psignal(p, SIGKILL); 2402 PROC_UNLOCK(p); 2403 } 2404 sx_sunlock(&allproc_lock); 2405 /* Remove the temporary reference added by jail_remove. */ 2406 prison_deref(pr, drflags); 2407 } 2408 2409 /* 2410 * struct jail_attach_args { 2411 * int jid; 2412 * }; 2413 */ 2414 int 2415 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2416 { 2417 struct prison *pr; 2418 int error; 2419 2420 error = priv_check(td, PRIV_JAIL_ATTACH); 2421 if (error) 2422 return (error); 2423 2424 /* 2425 * Start with exclusive hold on allprison_lock to ensure that a possible 2426 * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove. 2427 * But then immediately downgrade it since we don't need to stop 2428 * readers. 2429 */ 2430 sx_xlock(&allprison_lock); 2431 sx_downgrade(&allprison_lock); 2432 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2433 if (pr == NULL) { 2434 sx_sunlock(&allprison_lock); 2435 return (EINVAL); 2436 } 2437 2438 /* Do not allow a process to attach to a prison that is not alive. */ 2439 if (!prison_isalive(pr)) { 2440 mtx_unlock(&pr->pr_mtx); 2441 sx_sunlock(&allprison_lock); 2442 return (EINVAL); 2443 } 2444 2445 return (do_jail_attach(td, pr)); 2446 } 2447 2448 static int 2449 do_jail_attach(struct thread *td, struct prison *pr) 2450 { 2451 struct proc *p; 2452 struct ucred *newcred, *oldcred; 2453 int error; 2454 2455 /* 2456 * XXX: Note that there is a slight race here if two threads 2457 * in the same privileged process attempt to attach to two 2458 * different jails at the same time. It is important for 2459 * user processes not to do this, or they might end up with 2460 * a process root from one prison, but attached to the jail 2461 * of another. 2462 */ 2463 refcount_acquire(&pr->pr_ref); 2464 refcount_acquire(&pr->pr_uref); 2465 mtx_unlock(&pr->pr_mtx); 2466 2467 /* Let modules do whatever they need to prepare for attaching. */ 2468 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2469 if (error) { 2470 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2471 return (error); 2472 } 2473 sx_sunlock(&allprison_lock); 2474 2475 /* 2476 * Reparent the newly attached process to this jail. 2477 */ 2478 p = td->td_proc; 2479 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2480 if (error) 2481 goto e_revert_osd; 2482 2483 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2484 if ((error = change_dir(pr->pr_root, td)) != 0) 2485 goto e_unlock; 2486 #ifdef MAC 2487 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2488 goto e_unlock; 2489 #endif 2490 VOP_UNLOCK(pr->pr_root); 2491 if ((error = pwd_chroot(td, pr->pr_root))) 2492 goto e_revert_osd; 2493 2494 newcred = crget(); 2495 PROC_LOCK(p); 2496 oldcred = crcopysafe(p, newcred); 2497 newcred->cr_prison = pr; 2498 proc_set_cred(p, newcred); 2499 setsugid(p); 2500 #ifdef RACCT 2501 racct_proc_ucred_changed(p, oldcred, newcred); 2502 crhold(newcred); 2503 #endif 2504 PROC_UNLOCK(p); 2505 #ifdef RCTL 2506 rctl_proc_ucred_changed(p, newcred); 2507 crfree(newcred); 2508 #endif 2509 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF); 2510 crfree(oldcred); 2511 return (0); 2512 2513 e_unlock: 2514 VOP_UNLOCK(pr->pr_root); 2515 e_revert_osd: 2516 /* Tell modules this thread is still in its old jail after all. */ 2517 sx_slock(&allprison_lock); 2518 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2519 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2520 return (error); 2521 } 2522 2523 /* 2524 * Returns a locked prison instance, or NULL on failure. 2525 */ 2526 struct prison * 2527 prison_find(int prid) 2528 { 2529 struct prison *pr; 2530 2531 sx_assert(&allprison_lock, SX_LOCKED); 2532 TAILQ_FOREACH(pr, &allprison, pr_list) { 2533 if (pr->pr_id == prid) { 2534 mtx_lock(&pr->pr_mtx); 2535 if (prison_isvalid(pr)) 2536 return (pr); 2537 /* 2538 * Any active prison with the same ID would have 2539 * been inserted before a dead one. 2540 */ 2541 mtx_unlock(&pr->pr_mtx); 2542 break; 2543 } 2544 if (pr->pr_id > prid) 2545 break; 2546 } 2547 return (NULL); 2548 } 2549 2550 /* 2551 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2552 */ 2553 struct prison * 2554 prison_find_child(struct prison *mypr, int prid) 2555 { 2556 struct prison *pr; 2557 int descend; 2558 2559 sx_assert(&allprison_lock, SX_LOCKED); 2560 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2561 if (pr->pr_id == prid) { 2562 mtx_lock(&pr->pr_mtx); 2563 if (prison_isvalid(pr)) 2564 return (pr); 2565 mtx_unlock(&pr->pr_mtx); 2566 } 2567 } 2568 return (NULL); 2569 } 2570 2571 /* 2572 * Look for the name relative to mypr. Returns a locked prison or NULL. 2573 */ 2574 struct prison * 2575 prison_find_name(struct prison *mypr, const char *name) 2576 { 2577 struct prison *pr, *deadpr; 2578 size_t mylen; 2579 int descend; 2580 2581 sx_assert(&allprison_lock, SX_LOCKED); 2582 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2583 again: 2584 deadpr = NULL; 2585 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2586 if (!strcmp(pr->pr_name + mylen, name)) { 2587 mtx_lock(&pr->pr_mtx); 2588 if (prison_isalive(pr)) 2589 return (pr); 2590 if (prison_isvalid(pr)) 2591 deadpr = pr; 2592 mtx_unlock(&pr->pr_mtx); 2593 } 2594 } 2595 /* There was no valid prison - perhaps there was a dying one. */ 2596 if (deadpr != NULL) { 2597 mtx_lock(&deadpr->pr_mtx); 2598 if (!prison_isvalid(deadpr)) { 2599 mtx_unlock(&deadpr->pr_mtx); 2600 goto again; 2601 } 2602 } 2603 return (deadpr); 2604 } 2605 2606 /* 2607 * See if a prison has the specific flag set. The prison should be locked, 2608 * unless checking for flags that are only set at jail creation (such as 2609 * PR_IP4 and PR_IP6), or only the single bit is examined, without regard 2610 * to any other prison data. 2611 */ 2612 int 2613 prison_flag(struct ucred *cred, unsigned flag) 2614 { 2615 2616 return (cred->cr_prison->pr_flags & flag); 2617 } 2618 2619 int 2620 prison_allow(struct ucred *cred, unsigned flag) 2621 { 2622 2623 return ((cred->cr_prison->pr_allow & flag) != 0); 2624 } 2625 2626 /* 2627 * Hold a prison reference, by incrementing pr_ref. It is generally 2628 * an error to hold a prison that does not already have a reference. 2629 * A prison record will remain valid as long as it has at least one 2630 * reference, and will not be removed as long as either the prison 2631 * mutex or the allprison lock is held (allprison_lock may be shared). 2632 */ 2633 void 2634 prison_hold_locked(struct prison *pr) 2635 { 2636 2637 /* Locking is no longer required. */ 2638 prison_hold(pr); 2639 } 2640 2641 void 2642 prison_hold(struct prison *pr) 2643 { 2644 #ifdef INVARIANTS 2645 int was_valid = refcount_acquire_if_not_zero(&pr->pr_ref); 2646 2647 KASSERT(was_valid, 2648 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id)); 2649 #else 2650 refcount_acquire(&pr->pr_ref); 2651 #endif 2652 } 2653 2654 /* 2655 * Remove a prison reference. If that was the last reference, the 2656 * prison will be removed (at a later time). Return with the prison 2657 * unlocked. 2658 */ 2659 void 2660 prison_free_locked(struct prison *pr) 2661 { 2662 int lastref; 2663 2664 mtx_assert(&pr->pr_mtx, MA_OWNED); 2665 KASSERT(refcount_load(&pr->pr_ref) > 0, 2666 ("Trying to free dead prison %p (jid=%d).", 2667 pr, pr->pr_id)); 2668 lastref = refcount_release(&pr->pr_ref); 2669 mtx_unlock(&pr->pr_mtx); 2670 if (lastref) { 2671 /* 2672 * Don't remove the prison itself in this context, 2673 * in case there are locks held. 2674 */ 2675 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2676 } 2677 } 2678 2679 void 2680 prison_free(struct prison *pr) 2681 { 2682 2683 /* 2684 * Locking is only required when releasing the last reference. 2685 * This allows assurance that a locked prison will remain valid 2686 * until it is unlocked. 2687 */ 2688 KASSERT(refcount_load(&pr->pr_ref) > 0, 2689 ("Trying to free dead prison %p (jid=%d).", 2690 pr, pr->pr_id)); 2691 if (refcount_release_if_not_last(&pr->pr_ref)) 2692 return; 2693 mtx_lock(&pr->pr_mtx); 2694 prison_free_locked(pr); 2695 } 2696 2697 /* 2698 * Hold a a prison for user visibility, by incrementing pr_uref. 2699 * It is generally an error to hold a prison that isn't already 2700 * user-visible, except through the the jail system calls. It is also 2701 * an error to hold an invalid prison. A prison record will remain 2702 * alive as long as it has at least one user reference, and will not 2703 * be set to the dying state was long as the prison mutex is held. 2704 */ 2705 void 2706 prison_proc_hold(struct prison *pr) 2707 { 2708 #ifdef INVARIANTS 2709 int was_alive = refcount_acquire_if_not_zero(&pr->pr_uref); 2710 2711 KASSERT(was_alive, 2712 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2713 #else 2714 refcount_acquire(&pr->pr_uref); 2715 #endif 2716 } 2717 2718 /* 2719 * Remove a prison user reference. If it was the last reference, the 2720 * prison will be considered "dying", and may be removed once all of 2721 * its references are dropped. 2722 */ 2723 void 2724 prison_proc_free(struct prison *pr) 2725 { 2726 2727 /* 2728 * Locking is only required when releasing the last reference. 2729 * This allows assurance that a locked prison will remain alive 2730 * until it is unlocked. 2731 */ 2732 KASSERT(refcount_load(&pr->pr_uref) > 0, 2733 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2734 if (!refcount_release_if_not_last(&pr->pr_uref)) { 2735 /* 2736 * Don't remove the last user reference in this context, 2737 * which is expected to be a process that is not only locked, 2738 * but also half dead. Add a reference so any calls to 2739 * prison_free() won't re-submit the task. 2740 */ 2741 refcount_acquire(&pr->pr_ref); 2742 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2743 } 2744 } 2745 2746 /* 2747 * Complete a call to either prison_free or prison_proc_free. 2748 */ 2749 static void 2750 prison_complete(void *context, int pending) 2751 { 2752 struct prison *pr = context; 2753 2754 sx_xlock(&allprison_lock); 2755 mtx_lock(&pr->pr_mtx); 2756 /* 2757 * If this is completing a call to prison_proc_free, there will still 2758 * be a user reference held; clear that as well as the reference that 2759 * was added. No references are expected if this is completing a call 2760 * to prison_free, but prison_deref is still called for the cleanup. 2761 */ 2762 prison_deref(pr, refcount_load(&pr->pr_uref) > 0 2763 ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED 2764 : PD_LOCKED | PD_LIST_XLOCKED); 2765 } 2766 2767 /* 2768 * Remove a prison reference and/or user reference (usually). 2769 * This assumes context that allows sleeping (for allprison_lock), 2770 * with no non-sleeping locks held, except perhaps the prison itself. 2771 * If there are no more references, release and delist the prison. 2772 * On completion, the prison lock and the allprison lock are both 2773 * unlocked. 2774 */ 2775 static void 2776 prison_deref(struct prison *pr, int flags) 2777 { 2778 struct prison *ppr, *tpr; 2779 int lastref, lasturef; 2780 2781 if (!(flags & PD_LOCKED)) 2782 mtx_lock(&pr->pr_mtx); 2783 for (;;) { 2784 if (flags & PD_DEUREF) { 2785 KASSERT(refcount_load(&pr->pr_uref) > 0, 2786 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 2787 pr->pr_id)); 2788 lasturef = refcount_release(&pr->pr_uref); 2789 if (lasturef) 2790 refcount_acquire(&pr->pr_ref); 2791 KASSERT(refcount_load(&prison0.pr_uref) > 0, 2792 ("prison0 pr_uref=0")); 2793 } else 2794 lasturef = 0; 2795 if (flags & PD_DEREF) { 2796 KASSERT(refcount_load(&pr->pr_ref) > 0, 2797 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 2798 pr->pr_id)); 2799 lastref = refcount_release(&pr->pr_ref); 2800 } 2801 else 2802 lastref = refcount_load(&pr->pr_ref) == 0; 2803 mtx_unlock(&pr->pr_mtx); 2804 2805 /* 2806 * Tell the modules if the last user reference was removed 2807 * (even it sticks around in dying state). 2808 */ 2809 if (lasturef) { 2810 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) { 2811 if (atomic_load_acq_int(&pr->pr_ref) > 1) { 2812 sx_slock(&allprison_lock); 2813 flags |= PD_LIST_SLOCKED; 2814 } else { 2815 sx_xlock(&allprison_lock); 2816 flags |= PD_LIST_XLOCKED; 2817 } 2818 } 2819 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 2820 mtx_lock(&pr->pr_mtx); 2821 lastref = refcount_release(&pr->pr_ref); 2822 mtx_unlock(&pr->pr_mtx); 2823 } 2824 2825 /* If the prison still has references, nothing else to do. */ 2826 if (!lastref) { 2827 if (flags & PD_LIST_SLOCKED) 2828 sx_sunlock(&allprison_lock); 2829 else if (flags & PD_LIST_XLOCKED) 2830 sx_xunlock(&allprison_lock); 2831 return; 2832 } 2833 2834 if (flags & PD_LIST_SLOCKED) { 2835 if (!sx_try_upgrade(&allprison_lock)) { 2836 sx_sunlock(&allprison_lock); 2837 sx_xlock(&allprison_lock); 2838 } 2839 } else if (!(flags & PD_LIST_XLOCKED)) 2840 sx_xlock(&allprison_lock); 2841 2842 TAILQ_REMOVE(&allprison, pr, pr_list); 2843 LIST_REMOVE(pr, pr_sibling); 2844 ppr = pr->pr_parent; 2845 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2846 tpr->pr_childcount--; 2847 sx_xunlock(&allprison_lock); 2848 2849 #ifdef VIMAGE 2850 if (pr->pr_vnet != ppr->pr_vnet) 2851 vnet_destroy(pr->pr_vnet); 2852 #endif 2853 if (pr->pr_root != NULL) 2854 vrele(pr->pr_root); 2855 mtx_destroy(&pr->pr_mtx); 2856 #ifdef INET 2857 free(pr->pr_ip4, M_PRISON); 2858 #endif 2859 #ifdef INET6 2860 free(pr->pr_ip6, M_PRISON); 2861 #endif 2862 if (pr->pr_cpuset != NULL) 2863 cpuset_rel(pr->pr_cpuset); 2864 osd_jail_exit(pr); 2865 #ifdef RACCT 2866 if (racct_enable) 2867 prison_racct_detach(pr); 2868 #endif 2869 free(pr, M_PRISON); 2870 2871 /* Removing a prison frees a reference on its parent. */ 2872 pr = ppr; 2873 mtx_lock(&pr->pr_mtx); 2874 flags = PD_DEREF | PD_DEUREF; 2875 } 2876 } 2877 2878 /* 2879 * Set or clear a permission bit in the pr_allow field, passing restrictions 2880 * (cleared permission) down to child jails. 2881 */ 2882 void 2883 prison_set_allow(struct ucred *cred, unsigned flag, int enable) 2884 { 2885 struct prison *pr; 2886 2887 pr = cred->cr_prison; 2888 sx_slock(&allprison_lock); 2889 mtx_lock(&pr->pr_mtx); 2890 prison_set_allow_locked(pr, flag, enable); 2891 mtx_unlock(&pr->pr_mtx); 2892 sx_sunlock(&allprison_lock); 2893 } 2894 2895 static void 2896 prison_set_allow_locked(struct prison *pr, unsigned flag, int enable) 2897 { 2898 struct prison *cpr; 2899 int descend; 2900 2901 if (enable != 0) 2902 pr->pr_allow |= flag; 2903 else { 2904 pr->pr_allow &= ~flag; 2905 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 2906 cpr->pr_allow &= ~flag; 2907 } 2908 } 2909 2910 /* 2911 * Check if a jail supports the given address family. 2912 * 2913 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 2914 * if not. 2915 */ 2916 int 2917 prison_check_af(struct ucred *cred, int af) 2918 { 2919 struct prison *pr; 2920 int error; 2921 2922 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2923 2924 pr = cred->cr_prison; 2925 #ifdef VIMAGE 2926 /* Prisons with their own network stack are not limited. */ 2927 if (prison_owns_vnet(cred)) 2928 return (0); 2929 #endif 2930 2931 error = 0; 2932 switch (af) 2933 { 2934 #ifdef INET 2935 case AF_INET: 2936 if (pr->pr_flags & PR_IP4) 2937 { 2938 mtx_lock(&pr->pr_mtx); 2939 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 2940 error = EAFNOSUPPORT; 2941 mtx_unlock(&pr->pr_mtx); 2942 } 2943 break; 2944 #endif 2945 #ifdef INET6 2946 case AF_INET6: 2947 if (pr->pr_flags & PR_IP6) 2948 { 2949 mtx_lock(&pr->pr_mtx); 2950 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 2951 error = EAFNOSUPPORT; 2952 mtx_unlock(&pr->pr_mtx); 2953 } 2954 break; 2955 #endif 2956 case AF_LOCAL: 2957 case AF_ROUTE: 2958 break; 2959 default: 2960 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 2961 error = EAFNOSUPPORT; 2962 } 2963 return (error); 2964 } 2965 2966 /* 2967 * Check if given address belongs to the jail referenced by cred (wrapper to 2968 * prison_check_ip[46]). 2969 * 2970 * Returns 0 if jail doesn't restrict the address family or if address belongs 2971 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 2972 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 2973 */ 2974 int 2975 prison_if(struct ucred *cred, const struct sockaddr *sa) 2976 { 2977 #ifdef INET 2978 const struct sockaddr_in *sai; 2979 #endif 2980 #ifdef INET6 2981 const struct sockaddr_in6 *sai6; 2982 #endif 2983 int error; 2984 2985 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2986 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 2987 2988 #ifdef VIMAGE 2989 if (prison_owns_vnet(cred)) 2990 return (0); 2991 #endif 2992 2993 error = 0; 2994 switch (sa->sa_family) 2995 { 2996 #ifdef INET 2997 case AF_INET: 2998 sai = (const struct sockaddr_in *)sa; 2999 error = prison_check_ip4(cred, &sai->sin_addr); 3000 break; 3001 #endif 3002 #ifdef INET6 3003 case AF_INET6: 3004 sai6 = (const struct sockaddr_in6 *)sa; 3005 error = prison_check_ip6(cred, &sai6->sin6_addr); 3006 break; 3007 #endif 3008 default: 3009 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3010 error = EAFNOSUPPORT; 3011 } 3012 return (error); 3013 } 3014 3015 /* 3016 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3017 */ 3018 int 3019 prison_check(struct ucred *cred1, struct ucred *cred2) 3020 { 3021 3022 return ((cred1->cr_prison == cred2->cr_prison || 3023 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3024 } 3025 3026 /* 3027 * Return 1 if p2 is a child of p1, otherwise 0. 3028 */ 3029 int 3030 prison_ischild(struct prison *pr1, struct prison *pr2) 3031 { 3032 3033 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3034 if (pr1 == pr2) 3035 return (1); 3036 return (0); 3037 } 3038 3039 /* 3040 * Return true if the prison is currently alive. A prison is alive if it is 3041 * valid and it holds user references. 3042 */ 3043 bool 3044 prison_isalive(struct prison *pr) 3045 { 3046 3047 mtx_assert(&pr->pr_mtx, MA_OWNED); 3048 if (__predict_false(refcount_load(&pr->pr_ref) == 0)) 3049 return (false); 3050 if (__predict_false(refcount_load(&pr->pr_uref) == 0)) 3051 return (false); 3052 return (true); 3053 } 3054 3055 /* 3056 * Return true if the prison is currently valid. A prison is valid if it has 3057 * been fully created, and is not being destroyed. Note that dying prisons 3058 * are still considered valid. 3059 */ 3060 bool 3061 prison_isvalid(struct prison *pr) 3062 { 3063 3064 mtx_assert(&pr->pr_mtx, MA_OWNED); 3065 if (__predict_false(refcount_load(&pr->pr_ref) == 0)) 3066 return (false); 3067 return (true); 3068 } 3069 3070 /* 3071 * Return 1 if the passed credential is in a jail and that jail does not 3072 * have its own virtual network stack, otherwise 0. 3073 */ 3074 int 3075 jailed_without_vnet(struct ucred *cred) 3076 { 3077 3078 if (!jailed(cred)) 3079 return (0); 3080 #ifdef VIMAGE 3081 if (prison_owns_vnet(cred)) 3082 return (0); 3083 #endif 3084 3085 return (1); 3086 } 3087 3088 /* 3089 * Return the correct hostname (domainname, et al) for the passed credential. 3090 */ 3091 void 3092 getcredhostname(struct ucred *cred, char *buf, size_t size) 3093 { 3094 struct prison *pr; 3095 3096 /* 3097 * A NULL credential can be used to shortcut to the physical 3098 * system's hostname. 3099 */ 3100 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3101 mtx_lock(&pr->pr_mtx); 3102 strlcpy(buf, pr->pr_hostname, size); 3103 mtx_unlock(&pr->pr_mtx); 3104 } 3105 3106 void 3107 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3108 { 3109 3110 mtx_lock(&cred->cr_prison->pr_mtx); 3111 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3112 mtx_unlock(&cred->cr_prison->pr_mtx); 3113 } 3114 3115 void 3116 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3117 { 3118 3119 mtx_lock(&cred->cr_prison->pr_mtx); 3120 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3121 mtx_unlock(&cred->cr_prison->pr_mtx); 3122 } 3123 3124 void 3125 getcredhostid(struct ucred *cred, unsigned long *hostid) 3126 { 3127 3128 mtx_lock(&cred->cr_prison->pr_mtx); 3129 *hostid = cred->cr_prison->pr_hostid; 3130 mtx_unlock(&cred->cr_prison->pr_mtx); 3131 } 3132 3133 void 3134 getjailname(struct ucred *cred, char *name, size_t len) 3135 { 3136 3137 mtx_lock(&cred->cr_prison->pr_mtx); 3138 strlcpy(name, cred->cr_prison->pr_name, len); 3139 mtx_unlock(&cred->cr_prison->pr_mtx); 3140 } 3141 3142 #ifdef VIMAGE 3143 /* 3144 * Determine whether the prison represented by cred owns 3145 * its vnet rather than having it inherited. 3146 * 3147 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3148 */ 3149 int 3150 prison_owns_vnet(struct ucred *cred) 3151 { 3152 3153 /* 3154 * vnets cannot be added/removed after jail creation, 3155 * so no need to lock here. 3156 */ 3157 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3158 } 3159 #endif 3160 3161 /* 3162 * Determine whether the subject represented by cred can "see" 3163 * status of a mount point. 3164 * Returns: 0 for permitted, ENOENT otherwise. 3165 * XXX: This function should be called cr_canseemount() and should be 3166 * placed in kern_prot.c. 3167 */ 3168 int 3169 prison_canseemount(struct ucred *cred, struct mount *mp) 3170 { 3171 struct prison *pr; 3172 struct statfs *sp; 3173 size_t len; 3174 3175 pr = cred->cr_prison; 3176 if (pr->pr_enforce_statfs == 0) 3177 return (0); 3178 if (pr->pr_root->v_mount == mp) 3179 return (0); 3180 if (pr->pr_enforce_statfs == 2) 3181 return (ENOENT); 3182 /* 3183 * If jail's chroot directory is set to "/" we should be able to see 3184 * all mount-points from inside a jail. 3185 * This is ugly check, but this is the only situation when jail's 3186 * directory ends with '/'. 3187 */ 3188 if (strcmp(pr->pr_path, "/") == 0) 3189 return (0); 3190 len = strlen(pr->pr_path); 3191 sp = &mp->mnt_stat; 3192 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3193 return (ENOENT); 3194 /* 3195 * Be sure that we don't have situation where jail's root directory 3196 * is "/some/path" and mount point is "/some/pathpath". 3197 */ 3198 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3199 return (ENOENT); 3200 return (0); 3201 } 3202 3203 void 3204 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3205 { 3206 char jpath[MAXPATHLEN]; 3207 struct prison *pr; 3208 size_t len; 3209 3210 pr = cred->cr_prison; 3211 if (pr->pr_enforce_statfs == 0) 3212 return; 3213 if (prison_canseemount(cred, mp) != 0) { 3214 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3215 strlcpy(sp->f_mntonname, "[restricted]", 3216 sizeof(sp->f_mntonname)); 3217 return; 3218 } 3219 if (pr->pr_root->v_mount == mp) { 3220 /* 3221 * Clear current buffer data, so we are sure nothing from 3222 * the valid path left there. 3223 */ 3224 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3225 *sp->f_mntonname = '/'; 3226 return; 3227 } 3228 /* 3229 * If jail's chroot directory is set to "/" we should be able to see 3230 * all mount-points from inside a jail. 3231 */ 3232 if (strcmp(pr->pr_path, "/") == 0) 3233 return; 3234 len = strlen(pr->pr_path); 3235 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3236 /* 3237 * Clear current buffer data, so we are sure nothing from 3238 * the valid path left there. 3239 */ 3240 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3241 if (*jpath == '\0') { 3242 /* Should never happen. */ 3243 *sp->f_mntonname = '/'; 3244 } else { 3245 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3246 } 3247 } 3248 3249 /* 3250 * Check with permission for a specific privilege is granted within jail. We 3251 * have a specific list of accepted privileges; the rest are denied. 3252 */ 3253 int 3254 prison_priv_check(struct ucred *cred, int priv) 3255 { 3256 struct prison *pr; 3257 int error; 3258 3259 /* 3260 * Some policies have custom handlers. This routine should not be 3261 * called for them. See priv_check_cred(). 3262 */ 3263 switch (priv) { 3264 case PRIV_VFS_LOOKUP: 3265 case PRIV_VFS_GENERATION: 3266 KASSERT(0, ("prison_priv_check instead of a custom handler " 3267 "called for %d\n", priv)); 3268 } 3269 3270 if (!jailed(cred)) 3271 return (0); 3272 3273 #ifdef VIMAGE 3274 /* 3275 * Privileges specific to prisons with a virtual network stack. 3276 * There might be a duplicate entry here in case the privilege 3277 * is only granted conditionally in the legacy jail case. 3278 */ 3279 switch (priv) { 3280 #ifdef notyet 3281 /* 3282 * NFS-specific privileges. 3283 */ 3284 case PRIV_NFS_DAEMON: 3285 case PRIV_NFS_LOCKD: 3286 #endif 3287 /* 3288 * Network stack privileges. 3289 */ 3290 case PRIV_NET_BRIDGE: 3291 case PRIV_NET_GRE: 3292 case PRIV_NET_BPF: 3293 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3294 case PRIV_NET_ROUTE: 3295 case PRIV_NET_TAP: 3296 case PRIV_NET_SETIFMTU: 3297 case PRIV_NET_SETIFFLAGS: 3298 case PRIV_NET_SETIFCAP: 3299 case PRIV_NET_SETIFDESCR: 3300 case PRIV_NET_SETIFNAME : 3301 case PRIV_NET_SETIFMETRIC: 3302 case PRIV_NET_SETIFPHYS: 3303 case PRIV_NET_SETIFMAC: 3304 case PRIV_NET_SETLANPCP: 3305 case PRIV_NET_ADDMULTI: 3306 case PRIV_NET_DELMULTI: 3307 case PRIV_NET_HWIOCTL: 3308 case PRIV_NET_SETLLADDR: 3309 case PRIV_NET_ADDIFGROUP: 3310 case PRIV_NET_DELIFGROUP: 3311 case PRIV_NET_IFCREATE: 3312 case PRIV_NET_IFDESTROY: 3313 case PRIV_NET_ADDIFADDR: 3314 case PRIV_NET_DELIFADDR: 3315 case PRIV_NET_LAGG: 3316 case PRIV_NET_GIF: 3317 case PRIV_NET_SETIFVNET: 3318 case PRIV_NET_SETIFFIB: 3319 3320 /* 3321 * 802.11-related privileges. 3322 */ 3323 case PRIV_NET80211_VAP_GETKEY: 3324 case PRIV_NET80211_VAP_MANAGE: 3325 3326 #ifdef notyet 3327 /* 3328 * ATM privileges. 3329 */ 3330 case PRIV_NETATM_CFG: 3331 case PRIV_NETATM_ADD: 3332 case PRIV_NETATM_DEL: 3333 case PRIV_NETATM_SET: 3334 3335 /* 3336 * Bluetooth privileges. 3337 */ 3338 case PRIV_NETBLUETOOTH_RAW: 3339 #endif 3340 3341 /* 3342 * Netgraph and netgraph module privileges. 3343 */ 3344 case PRIV_NETGRAPH_CONTROL: 3345 #ifdef notyet 3346 case PRIV_NETGRAPH_TTY: 3347 #endif 3348 3349 /* 3350 * IPv4 and IPv6 privileges. 3351 */ 3352 case PRIV_NETINET_IPFW: 3353 case PRIV_NETINET_DIVERT: 3354 case PRIV_NETINET_PF: 3355 case PRIV_NETINET_DUMMYNET: 3356 case PRIV_NETINET_CARP: 3357 case PRIV_NETINET_MROUTE: 3358 case PRIV_NETINET_RAW: 3359 case PRIV_NETINET_ADDRCTRL6: 3360 case PRIV_NETINET_ND6: 3361 case PRIV_NETINET_SCOPE6: 3362 case PRIV_NETINET_ALIFETIME6: 3363 case PRIV_NETINET_IPSEC: 3364 case PRIV_NETINET_BINDANY: 3365 3366 #ifdef notyet 3367 /* 3368 * NCP privileges. 3369 */ 3370 case PRIV_NETNCP: 3371 3372 /* 3373 * SMB privileges. 3374 */ 3375 case PRIV_NETSMB: 3376 #endif 3377 3378 /* 3379 * No default: or deny here. 3380 * In case of no permit fall through to next switch(). 3381 */ 3382 if (cred->cr_prison->pr_flags & PR_VNET) 3383 return (0); 3384 } 3385 #endif /* VIMAGE */ 3386 3387 switch (priv) { 3388 /* 3389 * Allow ktrace privileges for root in jail. 3390 */ 3391 case PRIV_KTRACE: 3392 3393 #if 0 3394 /* 3395 * Allow jailed processes to configure audit identity and 3396 * submit audit records (login, etc). In the future we may 3397 * want to further refine the relationship between audit and 3398 * jail. 3399 */ 3400 case PRIV_AUDIT_GETAUDIT: 3401 case PRIV_AUDIT_SETAUDIT: 3402 case PRIV_AUDIT_SUBMIT: 3403 #endif 3404 3405 /* 3406 * Allow jailed processes to manipulate process UNIX 3407 * credentials in any way they see fit. 3408 */ 3409 case PRIV_CRED_SETUID: 3410 case PRIV_CRED_SETEUID: 3411 case PRIV_CRED_SETGID: 3412 case PRIV_CRED_SETEGID: 3413 case PRIV_CRED_SETGROUPS: 3414 case PRIV_CRED_SETREUID: 3415 case PRIV_CRED_SETREGID: 3416 case PRIV_CRED_SETRESUID: 3417 case PRIV_CRED_SETRESGID: 3418 3419 /* 3420 * Jail implements visibility constraints already, so allow 3421 * jailed root to override uid/gid-based constraints. 3422 */ 3423 case PRIV_SEEOTHERGIDS: 3424 case PRIV_SEEOTHERUIDS: 3425 3426 /* 3427 * Jail implements inter-process debugging limits already, so 3428 * allow jailed root various debugging privileges. 3429 */ 3430 case PRIV_DEBUG_DIFFCRED: 3431 case PRIV_DEBUG_SUGID: 3432 case PRIV_DEBUG_UNPRIV: 3433 3434 /* 3435 * Allow jail to set various resource limits and login 3436 * properties, and for now, exceed process resource limits. 3437 */ 3438 case PRIV_PROC_LIMIT: 3439 case PRIV_PROC_SETLOGIN: 3440 case PRIV_PROC_SETRLIMIT: 3441 3442 /* 3443 * System V and POSIX IPC privileges are granted in jail. 3444 */ 3445 case PRIV_IPC_READ: 3446 case PRIV_IPC_WRITE: 3447 case PRIV_IPC_ADMIN: 3448 case PRIV_IPC_MSGSIZE: 3449 case PRIV_MQ_ADMIN: 3450 3451 /* 3452 * Jail operations within a jail work on child jails. 3453 */ 3454 case PRIV_JAIL_ATTACH: 3455 case PRIV_JAIL_SET: 3456 case PRIV_JAIL_REMOVE: 3457 3458 /* 3459 * Jail implements its own inter-process limits, so allow 3460 * root processes in jail to change scheduling on other 3461 * processes in the same jail. Likewise for signalling. 3462 */ 3463 case PRIV_SCHED_DIFFCRED: 3464 case PRIV_SCHED_CPUSET: 3465 case PRIV_SIGNAL_DIFFCRED: 3466 case PRIV_SIGNAL_SUGID: 3467 3468 /* 3469 * Allow jailed processes to write to sysctls marked as jail 3470 * writable. 3471 */ 3472 case PRIV_SYSCTL_WRITEJAIL: 3473 3474 /* 3475 * Allow root in jail to manage a variety of quota 3476 * properties. These should likely be conditional on a 3477 * configuration option. 3478 */ 3479 case PRIV_VFS_GETQUOTA: 3480 case PRIV_VFS_SETQUOTA: 3481 3482 /* 3483 * Since Jail relies on chroot() to implement file system 3484 * protections, grant many VFS privileges to root in jail. 3485 * Be careful to exclude mount-related and NFS-related 3486 * privileges. 3487 */ 3488 case PRIV_VFS_READ: 3489 case PRIV_VFS_WRITE: 3490 case PRIV_VFS_ADMIN: 3491 case PRIV_VFS_EXEC: 3492 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3493 case PRIV_VFS_CHFLAGS_DEV: 3494 case PRIV_VFS_CHOWN: 3495 case PRIV_VFS_CHROOT: 3496 case PRIV_VFS_RETAINSUGID: 3497 case PRIV_VFS_FCHROOT: 3498 case PRIV_VFS_LINK: 3499 case PRIV_VFS_SETGID: 3500 case PRIV_VFS_STAT: 3501 case PRIV_VFS_STICKYFILE: 3502 3503 /* 3504 * As in the non-jail case, non-root users are expected to be 3505 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3506 * exists in the jail and they have permission to access it). 3507 */ 3508 case PRIV_KMEM_READ: 3509 return (0); 3510 3511 /* 3512 * Depending on the global setting, allow privilege of 3513 * setting system flags. 3514 */ 3515 case PRIV_VFS_SYSFLAGS: 3516 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3517 return (0); 3518 else 3519 return (EPERM); 3520 3521 /* 3522 * Depending on the global setting, allow privilege of 3523 * mounting/unmounting file systems. 3524 */ 3525 case PRIV_VFS_MOUNT: 3526 case PRIV_VFS_UNMOUNT: 3527 case PRIV_VFS_MOUNT_NONUSER: 3528 case PRIV_VFS_MOUNT_OWNER: 3529 pr = cred->cr_prison; 3530 prison_lock(pr); 3531 if (pr->pr_allow & PR_ALLOW_MOUNT && pr->pr_enforce_statfs < 2) 3532 error = 0; 3533 else 3534 error = EPERM; 3535 prison_unlock(pr); 3536 return (error); 3537 3538 /* 3539 * Jails should hold no disposition on the PRIV_VFS_READ_DIR 3540 * policy. priv_check_cred will not specifically allow it, and 3541 * we may want a MAC policy to allow it. 3542 */ 3543 case PRIV_VFS_READ_DIR: 3544 return (0); 3545 3546 /* 3547 * Conditionnaly allow locking (unlocking) physical pages 3548 * in memory. 3549 */ 3550 case PRIV_VM_MLOCK: 3551 case PRIV_VM_MUNLOCK: 3552 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK) 3553 return (0); 3554 else 3555 return (EPERM); 3556 3557 /* 3558 * Conditionally allow jailed root to bind reserved ports. 3559 */ 3560 case PRIV_NETINET_RESERVEDPORT: 3561 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS) 3562 return (0); 3563 else 3564 return (EPERM); 3565 3566 /* 3567 * Allow jailed root to reuse in-use ports. 3568 */ 3569 case PRIV_NETINET_REUSEPORT: 3570 return (0); 3571 3572 /* 3573 * Allow jailed root to set certain IPv4/6 (option) headers. 3574 */ 3575 case PRIV_NETINET_SETHDROPTS: 3576 return (0); 3577 3578 /* 3579 * Conditionally allow creating raw sockets in jail. 3580 */ 3581 case PRIV_NETINET_RAW: 3582 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3583 return (0); 3584 else 3585 return (EPERM); 3586 3587 /* 3588 * Since jail implements its own visibility limits on netstat 3589 * sysctls, allow getcred. This allows identd to work in 3590 * jail. 3591 */ 3592 case PRIV_NETINET_GETCRED: 3593 return (0); 3594 3595 /* 3596 * Allow jailed root to set loginclass. 3597 */ 3598 case PRIV_PROC_SETLOGINCLASS: 3599 return (0); 3600 3601 /* 3602 * Do not allow a process inside a jail to read the kernel 3603 * message buffer unless explicitly permitted. 3604 */ 3605 case PRIV_MSGBUF: 3606 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF) 3607 return (0); 3608 return (EPERM); 3609 3610 default: 3611 /* 3612 * In all remaining cases, deny the privilege request. This 3613 * includes almost all network privileges, many system 3614 * configuration privileges. 3615 */ 3616 return (EPERM); 3617 } 3618 } 3619 3620 /* 3621 * Return the part of pr2's name that is relative to pr1, or the whole name 3622 * if it does not directly follow. 3623 */ 3624 3625 char * 3626 prison_name(struct prison *pr1, struct prison *pr2) 3627 { 3628 char *name; 3629 3630 /* Jails see themselves as "0" (if they see themselves at all). */ 3631 if (pr1 == pr2) 3632 return "0"; 3633 name = pr2->pr_name; 3634 if (prison_ischild(pr1, pr2)) { 3635 /* 3636 * pr1 isn't locked (and allprison_lock may not be either) 3637 * so its length can't be counted on. But the number of dots 3638 * can be counted on - and counted. 3639 */ 3640 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3641 name = strchr(name, '.') + 1; 3642 } 3643 return (name); 3644 } 3645 3646 /* 3647 * Return the part of pr2's path that is relative to pr1, or the whole path 3648 * if it does not directly follow. 3649 */ 3650 static char * 3651 prison_path(struct prison *pr1, struct prison *pr2) 3652 { 3653 char *path1, *path2; 3654 int len1; 3655 3656 path1 = pr1->pr_path; 3657 path2 = pr2->pr_path; 3658 if (!strcmp(path1, "/")) 3659 return (path2); 3660 len1 = strlen(path1); 3661 if (strncmp(path1, path2, len1)) 3662 return (path2); 3663 if (path2[len1] == '\0') 3664 return "/"; 3665 if (path2[len1] == '/') 3666 return (path2 + len1); 3667 return (path2); 3668 } 3669 3670 /* 3671 * Jail-related sysctls. 3672 */ 3673 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 3674 "Jails"); 3675 3676 static int 3677 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 3678 { 3679 struct xprison *xp; 3680 struct prison *pr, *cpr; 3681 #ifdef INET 3682 struct in_addr *ip4 = NULL; 3683 int ip4s = 0; 3684 #endif 3685 #ifdef INET6 3686 struct in6_addr *ip6 = NULL; 3687 int ip6s = 0; 3688 #endif 3689 int descend, error; 3690 3691 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 3692 pr = req->td->td_ucred->cr_prison; 3693 error = 0; 3694 sx_slock(&allprison_lock); 3695 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 3696 #if defined(INET) || defined(INET6) 3697 again: 3698 #endif 3699 mtx_lock(&cpr->pr_mtx); 3700 #ifdef INET 3701 if (cpr->pr_ip4s > 0) { 3702 if (ip4s < cpr->pr_ip4s) { 3703 ip4s = cpr->pr_ip4s; 3704 mtx_unlock(&cpr->pr_mtx); 3705 ip4 = realloc(ip4, ip4s * 3706 sizeof(struct in_addr), M_TEMP, M_WAITOK); 3707 goto again; 3708 } 3709 bcopy(cpr->pr_ip4, ip4, 3710 cpr->pr_ip4s * sizeof(struct in_addr)); 3711 } 3712 #endif 3713 #ifdef INET6 3714 if (cpr->pr_ip6s > 0) { 3715 if (ip6s < cpr->pr_ip6s) { 3716 ip6s = cpr->pr_ip6s; 3717 mtx_unlock(&cpr->pr_mtx); 3718 ip6 = realloc(ip6, ip6s * 3719 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 3720 goto again; 3721 } 3722 bcopy(cpr->pr_ip6, ip6, 3723 cpr->pr_ip6s * sizeof(struct in6_addr)); 3724 } 3725 #endif 3726 if (!prison_isvalid(cpr)) { 3727 mtx_unlock(&cpr->pr_mtx); 3728 continue; 3729 } 3730 bzero(xp, sizeof(*xp)); 3731 xp->pr_version = XPRISON_VERSION; 3732 xp->pr_id = cpr->pr_id; 3733 xp->pr_state = prison_isalive(cpr) 3734 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 3735 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 3736 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 3737 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 3738 #ifdef INET 3739 xp->pr_ip4s = cpr->pr_ip4s; 3740 #endif 3741 #ifdef INET6 3742 xp->pr_ip6s = cpr->pr_ip6s; 3743 #endif 3744 mtx_unlock(&cpr->pr_mtx); 3745 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 3746 if (error) 3747 break; 3748 #ifdef INET 3749 if (xp->pr_ip4s > 0) { 3750 error = SYSCTL_OUT(req, ip4, 3751 xp->pr_ip4s * sizeof(struct in_addr)); 3752 if (error) 3753 break; 3754 } 3755 #endif 3756 #ifdef INET6 3757 if (xp->pr_ip6s > 0) { 3758 error = SYSCTL_OUT(req, ip6, 3759 xp->pr_ip6s * sizeof(struct in6_addr)); 3760 if (error) 3761 break; 3762 } 3763 #endif 3764 } 3765 sx_sunlock(&allprison_lock); 3766 free(xp, M_TEMP); 3767 #ifdef INET 3768 free(ip4, M_TEMP); 3769 #endif 3770 #ifdef INET6 3771 free(ip6, M_TEMP); 3772 #endif 3773 return (error); 3774 } 3775 3776 SYSCTL_OID(_security_jail, OID_AUTO, list, 3777 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3778 sysctl_jail_list, "S", "List of active jails"); 3779 3780 static int 3781 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 3782 { 3783 int error, injail; 3784 3785 injail = jailed(req->td->td_ucred); 3786 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 3787 3788 return (error); 3789 } 3790 3791 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 3792 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3793 sysctl_jail_jailed, "I", "Process in jail?"); 3794 3795 static int 3796 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 3797 { 3798 int error, havevnet; 3799 #ifdef VIMAGE 3800 struct ucred *cred = req->td->td_ucred; 3801 3802 havevnet = jailed(cred) && prison_owns_vnet(cred); 3803 #else 3804 havevnet = 0; 3805 #endif 3806 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 3807 3808 return (error); 3809 } 3810 3811 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 3812 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3813 sysctl_jail_vnet, "I", "Jail owns vnet?"); 3814 3815 #if defined(INET) || defined(INET6) 3816 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 3817 &jail_max_af_ips, 0, 3818 "Number of IP addresses a jail may have at most per address family (deprecated)"); 3819 #endif 3820 3821 /* 3822 * Default parameters for jail(2) compatibility. For historical reasons, 3823 * the sysctl names have varying similarity to the parameter names. Prisons 3824 * just see their own parameters, and can't change them. 3825 */ 3826 static int 3827 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 3828 { 3829 int error, i; 3830 3831 /* Get the current flag value, and convert it to a boolean. */ 3832 if (req->td->td_ucred->cr_prison == &prison0) { 3833 mtx_lock(&prison0.pr_mtx); 3834 i = (jail_default_allow & arg2) != 0; 3835 mtx_unlock(&prison0.pr_mtx); 3836 } else 3837 i = prison_allow(req->td->td_ucred, arg2); 3838 3839 if (arg1 != NULL) 3840 i = !i; 3841 error = sysctl_handle_int(oidp, &i, 0, req); 3842 if (error || !req->newptr) 3843 return (error); 3844 i = i ? arg2 : 0; 3845 if (arg1 != NULL) 3846 i ^= arg2; 3847 /* 3848 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 3849 * for writing. 3850 */ 3851 mtx_lock(&prison0.pr_mtx); 3852 jail_default_allow = (jail_default_allow & ~arg2) | i; 3853 mtx_unlock(&prison0.pr_mtx); 3854 return (0); 3855 } 3856 3857 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 3858 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3859 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 3860 "Processes in jail can set their hostnames (deprecated)"); 3861 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 3862 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3863 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 3864 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 3865 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 3866 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3867 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 3868 "Processes in jail can use System V IPC primitives (deprecated)"); 3869 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 3870 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3871 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 3872 "Prison root can create raw sockets (deprecated)"); 3873 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 3874 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3875 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 3876 "Processes in jail can alter system file flags (deprecated)"); 3877 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 3878 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3879 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 3880 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 3881 3882 static int 3883 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 3884 { 3885 struct prison *pr; 3886 int level, error; 3887 3888 pr = req->td->td_ucred->cr_prison; 3889 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 3890 error = sysctl_handle_int(oidp, &level, 0, req); 3891 if (error || !req->newptr) 3892 return (error); 3893 *(int *)arg1 = level; 3894 return (0); 3895 } 3896 3897 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 3898 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3899 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 3900 sysctl_jail_default_level, "I", 3901 "Processes in jail cannot see all mounted file systems (deprecated)"); 3902 3903 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 3904 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 3905 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 3906 sysctl_jail_default_level, "I", 3907 "Ruleset for the devfs filesystem in jail (deprecated)"); 3908 3909 /* 3910 * Nodes to describe jail parameters. Maximum length of string parameters 3911 * is returned in the string itself, and the other parameters exist merely 3912 * to make themselves and their types known. 3913 */ 3914 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 3915 "Jail parameters"); 3916 3917 int 3918 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 3919 { 3920 int i; 3921 long l; 3922 size_t s; 3923 char numbuf[12]; 3924 3925 switch (oidp->oid_kind & CTLTYPE) 3926 { 3927 case CTLTYPE_LONG: 3928 case CTLTYPE_ULONG: 3929 l = 0; 3930 #ifdef SCTL_MASK32 3931 if (!(req->flags & SCTL_MASK32)) 3932 #endif 3933 return (SYSCTL_OUT(req, &l, sizeof(l))); 3934 case CTLTYPE_INT: 3935 case CTLTYPE_UINT: 3936 i = 0; 3937 return (SYSCTL_OUT(req, &i, sizeof(i))); 3938 case CTLTYPE_STRING: 3939 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 3940 return 3941 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 3942 case CTLTYPE_STRUCT: 3943 s = (size_t)arg2; 3944 return (SYSCTL_OUT(req, &s, sizeof(s))); 3945 } 3946 return (0); 3947 } 3948 3949 /* 3950 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 3951 * jail creation time but cannot be changed in an existing jail. 3952 */ 3953 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 3954 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 3955 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 3956 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 3957 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 3958 "I", "Jail secure level"); 3959 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 3960 "Jail value for kern.osreldate and uname -K"); 3961 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 3962 "Jail value for kern.osrelease and uname -r"); 3963 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 3964 "I", "Jail cannot see all mounted file systems"); 3965 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 3966 "I", "Ruleset for in-jail devfs mounts"); 3967 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 3968 "B", "Jail persistence"); 3969 #ifdef VIMAGE 3970 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 3971 "E,jailsys", "Virtual network stack"); 3972 #endif 3973 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 3974 "B", "Jail is in the process of shutting down"); 3975 3976 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 3977 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 3978 "I", "Current number of child jails"); 3979 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 3980 "I", "Maximum number of child jails"); 3981 3982 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 3983 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 3984 "Jail hostname"); 3985 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 3986 "Jail NIS domainname"); 3987 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 3988 "Jail host UUID"); 3989 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 3990 "LU", "Jail host ID"); 3991 3992 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 3993 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 3994 3995 #ifdef INET 3996 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 3997 "Jail IPv4 address virtualization"); 3998 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 3999 "S,in_addr,a", "Jail IPv4 addresses"); 4000 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4001 "B", "Do (not) use IPv4 source address selection rather than the " 4002 "primary jail IPv4 address."); 4003 #endif 4004 #ifdef INET6 4005 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4006 "Jail IPv6 address virtualization"); 4007 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4008 "S,in6_addr,a", "Jail IPv6 addresses"); 4009 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4010 "B", "Do (not) use IPv6 source address selection rather than the " 4011 "primary jail IPv6 address."); 4012 #endif 4013 4014 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4015 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4016 "B", "Jail may set hostname"); 4017 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4018 "B", "Jail may use SYSV IPC"); 4019 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4020 "B", "Jail may create raw sockets"); 4021 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4022 "B", "Jail may alter system file flags"); 4023 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4024 "B", "Jail may set file quotas"); 4025 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4026 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4027 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW, 4028 "B", "Jail may lock (unlock) physical pages in memory"); 4029 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW, 4030 "B", "Jail may bind sockets to reserved ports"); 4031 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW, 4032 "B", "Jail may read the kernel message buffer"); 4033 SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW, 4034 "B", "Unprivileged processes may use process debugging facilities"); 4035 SYSCTL_JAIL_PARAM(_allow, suser, CTLTYPE_INT | CTLFLAG_RW, 4036 "B", "Processes in jail with uid 0 have privilege"); 4037 4038 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4039 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4040 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4041 4042 /* 4043 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return 4044 * its associated bit in the pr_allow bitmask, or zero if the parameter was 4045 * not created. 4046 */ 4047 unsigned 4048 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr, 4049 const char *descr) 4050 { 4051 struct bool_flags *bf; 4052 struct sysctl_oid *parent; 4053 char *allow_name, *allow_noname, *allowed; 4054 #ifndef NO_SYSCTL_DESCR 4055 char *descr_deprecated; 4056 #endif 4057 u_int allow_flag; 4058 4059 if (prefix 4060 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name) 4061 < 0 || 4062 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name) 4063 < 0 4064 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 || 4065 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) { 4066 free(allow_name, M_PRISON); 4067 return 0; 4068 } 4069 4070 /* 4071 * See if this parameter has already beed added, i.e. a module was 4072 * previously loaded/unloaded. 4073 */ 4074 mtx_lock(&prison0.pr_mtx); 4075 for (bf = pr_flag_allow; 4076 bf < pr_flag_allow + nitems(pr_flag_allow) && 4077 atomic_load_int(&bf->flag) != 0; 4078 bf++) { 4079 if (strcmp(bf->name, allow_name) == 0) { 4080 allow_flag = bf->flag; 4081 goto no_add; 4082 } 4083 } 4084 4085 /* 4086 * Find a free bit in pr_allow_all, failing if there are none 4087 * (which shouldn't happen as long as we keep track of how many 4088 * potential dynamic flags exist). 4089 */ 4090 for (allow_flag = 1;; allow_flag <<= 1) { 4091 if (allow_flag == 0) 4092 goto no_add; 4093 if ((pr_allow_all & allow_flag) == 0) 4094 break; 4095 } 4096 4097 /* Note the parameter in the next open slot in pr_flag_allow. */ 4098 for (bf = pr_flag_allow; ; bf++) { 4099 if (bf == pr_flag_allow + nitems(pr_flag_allow)) { 4100 /* This should never happen, but is not fatal. */ 4101 allow_flag = 0; 4102 goto no_add; 4103 } 4104 if (atomic_load_int(&bf->flag) == 0) 4105 break; 4106 } 4107 bf->name = allow_name; 4108 bf->noname = allow_noname; 4109 pr_allow_all |= allow_flag; 4110 /* 4111 * prison0 always has permission for the new parameter. 4112 * Other jails must have it granted to them. 4113 */ 4114 prison0.pr_allow |= allow_flag; 4115 /* The flag indicates a valid entry, so make sure it is set last. */ 4116 atomic_store_rel_int(&bf->flag, allow_flag); 4117 mtx_unlock(&prison0.pr_mtx); 4118 4119 /* 4120 * Create sysctls for the paramter, and the back-compat global 4121 * permission. 4122 */ 4123 parent = prefix 4124 ? SYSCTL_ADD_NODE(NULL, 4125 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow), 4126 OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr) 4127 : &sysctl___security_jail_param_allow; 4128 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO, 4129 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4130 NULL, 0, sysctl_jail_param, "B", descr); 4131 if ((prefix 4132 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name) 4133 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) { 4134 #ifndef NO_SYSCTL_DESCR 4135 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)", 4136 descr); 4137 #endif 4138 (void)SYSCTL_ADD_PROC(NULL, 4139 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed, 4140 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag, 4141 sysctl_jail_default_allow, "I", descr_deprecated); 4142 #ifndef NO_SYSCTL_DESCR 4143 free(descr_deprecated, M_TEMP); 4144 #endif 4145 free(allowed, M_TEMP); 4146 } 4147 return allow_flag; 4148 4149 no_add: 4150 mtx_unlock(&prison0.pr_mtx); 4151 free(allow_name, M_PRISON); 4152 free(allow_noname, M_PRISON); 4153 return allow_flag; 4154 } 4155 4156 /* 4157 * The VFS system will register jail-aware filesystems here. They each get 4158 * a parameter allow.mount.xxxfs and a flag to check when a jailed user 4159 * attempts to mount. 4160 */ 4161 void 4162 prison_add_vfs(struct vfsconf *vfsp) 4163 { 4164 #ifdef NO_SYSCTL_DESCR 4165 4166 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 4167 NULL, NULL); 4168 #else 4169 char *descr; 4170 4171 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system", 4172 vfsp->vfc_name); 4173 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 4174 NULL, descr); 4175 free(descr, M_TEMP); 4176 #endif 4177 } 4178 4179 #ifdef RACCT 4180 void 4181 prison_racct_foreach(void (*callback)(struct racct *racct, 4182 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 4183 void *arg2, void *arg3) 4184 { 4185 struct prison_racct *prr; 4186 4187 ASSERT_RACCT_ENABLED(); 4188 4189 sx_slock(&allprison_lock); 4190 if (pre != NULL) 4191 (pre)(); 4192 LIST_FOREACH(prr, &allprison_racct, prr_next) 4193 (callback)(prr->prr_racct, arg2, arg3); 4194 if (post != NULL) 4195 (post)(); 4196 sx_sunlock(&allprison_lock); 4197 } 4198 4199 static struct prison_racct * 4200 prison_racct_find_locked(const char *name) 4201 { 4202 struct prison_racct *prr; 4203 4204 ASSERT_RACCT_ENABLED(); 4205 sx_assert(&allprison_lock, SA_XLOCKED); 4206 4207 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4208 return (NULL); 4209 4210 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4211 if (strcmp(name, prr->prr_name) != 0) 4212 continue; 4213 4214 /* Found prison_racct with a matching name? */ 4215 prison_racct_hold(prr); 4216 return (prr); 4217 } 4218 4219 /* Add new prison_racct. */ 4220 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4221 racct_create(&prr->prr_racct); 4222 4223 strcpy(prr->prr_name, name); 4224 refcount_init(&prr->prr_refcount, 1); 4225 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4226 4227 return (prr); 4228 } 4229 4230 struct prison_racct * 4231 prison_racct_find(const char *name) 4232 { 4233 struct prison_racct *prr; 4234 4235 ASSERT_RACCT_ENABLED(); 4236 4237 sx_xlock(&allprison_lock); 4238 prr = prison_racct_find_locked(name); 4239 sx_xunlock(&allprison_lock); 4240 return (prr); 4241 } 4242 4243 void 4244 prison_racct_hold(struct prison_racct *prr) 4245 { 4246 4247 ASSERT_RACCT_ENABLED(); 4248 4249 refcount_acquire(&prr->prr_refcount); 4250 } 4251 4252 static void 4253 prison_racct_free_locked(struct prison_racct *prr) 4254 { 4255 4256 ASSERT_RACCT_ENABLED(); 4257 sx_assert(&allprison_lock, SA_XLOCKED); 4258 4259 if (refcount_release(&prr->prr_refcount)) { 4260 racct_destroy(&prr->prr_racct); 4261 LIST_REMOVE(prr, prr_next); 4262 free(prr, M_PRISON_RACCT); 4263 } 4264 } 4265 4266 void 4267 prison_racct_free(struct prison_racct *prr) 4268 { 4269 4270 ASSERT_RACCT_ENABLED(); 4271 sx_assert(&allprison_lock, SA_UNLOCKED); 4272 4273 if (refcount_release_if_not_last(&prr->prr_refcount)) 4274 return; 4275 4276 sx_xlock(&allprison_lock); 4277 prison_racct_free_locked(prr); 4278 sx_xunlock(&allprison_lock); 4279 } 4280 4281 static void 4282 prison_racct_attach(struct prison *pr) 4283 { 4284 struct prison_racct *prr; 4285 4286 ASSERT_RACCT_ENABLED(); 4287 sx_assert(&allprison_lock, SA_XLOCKED); 4288 4289 prr = prison_racct_find_locked(pr->pr_name); 4290 KASSERT(prr != NULL, ("cannot find prison_racct")); 4291 4292 pr->pr_prison_racct = prr; 4293 } 4294 4295 /* 4296 * Handle jail renaming. From the racct point of view, renaming means 4297 * moving from one prison_racct to another. 4298 */ 4299 static void 4300 prison_racct_modify(struct prison *pr) 4301 { 4302 #ifdef RCTL 4303 struct proc *p; 4304 struct ucred *cred; 4305 #endif 4306 struct prison_racct *oldprr; 4307 4308 ASSERT_RACCT_ENABLED(); 4309 4310 sx_slock(&allproc_lock); 4311 sx_xlock(&allprison_lock); 4312 4313 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4314 sx_xunlock(&allprison_lock); 4315 sx_sunlock(&allproc_lock); 4316 return; 4317 } 4318 4319 oldprr = pr->pr_prison_racct; 4320 pr->pr_prison_racct = NULL; 4321 4322 prison_racct_attach(pr); 4323 4324 /* 4325 * Move resource utilisation records. 4326 */ 4327 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4328 4329 #ifdef RCTL 4330 /* 4331 * Force rctl to reattach rules to processes. 4332 */ 4333 FOREACH_PROC_IN_SYSTEM(p) { 4334 PROC_LOCK(p); 4335 cred = crhold(p->p_ucred); 4336 PROC_UNLOCK(p); 4337 rctl_proc_ucred_changed(p, cred); 4338 crfree(cred); 4339 } 4340 #endif 4341 4342 sx_sunlock(&allproc_lock); 4343 prison_racct_free_locked(oldprr); 4344 sx_xunlock(&allprison_lock); 4345 } 4346 4347 static void 4348 prison_racct_detach(struct prison *pr) 4349 { 4350 4351 ASSERT_RACCT_ENABLED(); 4352 sx_assert(&allprison_lock, SA_UNLOCKED); 4353 4354 if (pr->pr_prison_racct == NULL) 4355 return; 4356 prison_racct_free(pr->pr_prison_racct); 4357 pr->pr_prison_racct = NULL; 4358 } 4359 #endif /* RACCT */ 4360 4361 #ifdef DDB 4362 4363 static void 4364 db_show_prison(struct prison *pr) 4365 { 4366 struct bool_flags *bf; 4367 struct jailsys_flags *jsf; 4368 #if defined(INET) || defined(INET6) 4369 int ii; 4370 #endif 4371 unsigned f; 4372 #ifdef INET 4373 char ip4buf[INET_ADDRSTRLEN]; 4374 #endif 4375 #ifdef INET6 4376 char ip6buf[INET6_ADDRSTRLEN]; 4377 #endif 4378 4379 db_printf("prison %p:\n", pr); 4380 db_printf(" jid = %d\n", pr->pr_id); 4381 db_printf(" name = %s\n", pr->pr_name); 4382 db_printf(" parent = %p\n", pr->pr_parent); 4383 db_printf(" ref = %d\n", pr->pr_ref); 4384 db_printf(" uref = %d\n", pr->pr_uref); 4385 db_printf(" path = %s\n", pr->pr_path); 4386 db_printf(" cpuset = %d\n", pr->pr_cpuset 4387 ? pr->pr_cpuset->cs_id : -1); 4388 #ifdef VIMAGE 4389 db_printf(" vnet = %p\n", pr->pr_vnet); 4390 #endif 4391 db_printf(" root = %p\n", pr->pr_root); 4392 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4393 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4394 db_printf(" children.max = %d\n", pr->pr_childmax); 4395 db_printf(" children.cur = %d\n", pr->pr_childcount); 4396 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4397 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4398 db_printf(" flags = 0x%x", pr->pr_flags); 4399 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++) 4400 if (pr->pr_flags & bf->flag) 4401 db_printf(" %s", bf->name); 4402 for (jsf = pr_flag_jailsys; 4403 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 4404 jsf++) { 4405 f = pr->pr_flags & (jsf->disable | jsf->new); 4406 db_printf(" %-16s= %s\n", jsf->name, 4407 (f != 0 && f == jsf->disable) ? "disable" 4408 : (f == jsf->new) ? "new" 4409 : "inherit"); 4410 } 4411 db_printf(" allow = 0x%x", pr->pr_allow); 4412 for (bf = pr_flag_allow; 4413 bf < pr_flag_allow + nitems(pr_flag_allow) && 4414 atomic_load_int(&bf->flag) != 0; 4415 bf++) 4416 if (pr->pr_allow & bf->flag) 4417 db_printf(" %s", bf->name); 4418 db_printf("\n"); 4419 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4420 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4421 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4422 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4423 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4424 #ifdef INET 4425 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4426 for (ii = 0; ii < pr->pr_ip4s; ii++) 4427 db_printf(" %s %s\n", 4428 ii == 0 ? "ip4.addr =" : " ", 4429 inet_ntoa_r(pr->pr_ip4[ii], ip4buf)); 4430 #endif 4431 #ifdef INET6 4432 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4433 for (ii = 0; ii < pr->pr_ip6s; ii++) 4434 db_printf(" %s %s\n", 4435 ii == 0 ? "ip6.addr =" : " ", 4436 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4437 #endif 4438 } 4439 4440 DB_SHOW_COMMAND(prison, db_show_prison_command) 4441 { 4442 struct prison *pr; 4443 4444 if (!have_addr) { 4445 /* 4446 * Show all prisons in the list, and prison0 which is not 4447 * listed. 4448 */ 4449 db_show_prison(&prison0); 4450 if (!db_pager_quit) { 4451 TAILQ_FOREACH(pr, &allprison, pr_list) { 4452 db_show_prison(pr); 4453 if (db_pager_quit) 4454 break; 4455 } 4456 } 4457 return; 4458 } 4459 4460 if (addr == 0) 4461 pr = &prison0; 4462 else { 4463 /* Look for a prison with the ID and with references. */ 4464 TAILQ_FOREACH(pr, &allprison, pr_list) 4465 if (pr->pr_id == addr && pr->pr_ref > 0) 4466 break; 4467 if (pr == NULL) 4468 /* Look again, without requiring a reference. */ 4469 TAILQ_FOREACH(pr, &allprison, pr_list) 4470 if (pr->pr_id == addr) 4471 break; 4472 if (pr == NULL) 4473 /* Assume address points to a valid prison. */ 4474 pr = (struct prison *)addr; 4475 } 4476 db_show_prison(pr); 4477 } 4478 4479 #endif /* DDB */ 4480