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_state = PRISON_STATE_ALIVE, 110 .pr_childmax = JAIL_MAX, 111 .pr_hostuuid = DEFAULT_HOSTUUID, 112 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 113 #ifdef VIMAGE 114 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 115 #else 116 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 117 #endif 118 .pr_allow = PR_ALLOW_ALL_STATIC, 119 }; 120 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 121 122 struct bool_flags { 123 const char *name; 124 const char *noname; 125 volatile u_int flag; 126 }; 127 struct jailsys_flags { 128 const char *name; 129 unsigned disable; 130 unsigned new; 131 }; 132 133 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 134 struct sx allprison_lock; 135 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 136 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 137 LIST_HEAD(, prison_racct) allprison_racct; 138 int lastprid = 0; 139 140 static int get_next_prid(struct prison **insprp); 141 static int do_jail_attach(struct thread *td, struct prison *pr, int drflags); 142 static void prison_complete(void *context, int pending); 143 static void prison_deref(struct prison *pr, int flags); 144 static int prison_lock_xlock(struct prison *pr, int flags); 145 static void prison_free_not_last(struct prison *pr); 146 static void prison_set_allow_locked(struct prison *pr, unsigned flag, 147 int enable); 148 static char *prison_path(struct prison *pr1, struct prison *pr2); 149 static void prison_remove_one(struct prison *pr); 150 #ifdef RACCT 151 static void prison_racct_attach(struct prison *pr); 152 static void prison_racct_modify(struct prison *pr); 153 static void prison_racct_detach(struct prison *pr); 154 #endif 155 156 /* Flags for prison_deref */ 157 #define PD_DEREF 0x01 /* Decrement pr_ref */ 158 #define PD_DEUREF 0x02 /* Decrement pr_uref */ 159 #define PD_LOCKED 0x04 /* pr_mtx is held */ 160 #define PD_LIST_SLOCKED 0x08 /* allprison_lock is held shared */ 161 #define PD_LIST_XLOCKED 0x10 /* allprison_lock is held exclusive */ 162 163 /* 164 * Parameter names corresponding to PR_* flag values. Size values are for kvm 165 * as we cannot figure out the size of a sparse array, or an array without a 166 * terminating entry. 167 */ 168 static struct bool_flags pr_flag_bool[] = { 169 {"persist", "nopersist", PR_PERSIST}, 170 #ifdef INET 171 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL}, 172 #endif 173 #ifdef INET6 174 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL}, 175 #endif 176 }; 177 const size_t pr_flag_bool_size = sizeof(pr_flag_bool); 178 179 static struct jailsys_flags pr_flag_jailsys[] = { 180 {"host", 0, PR_HOST}, 181 #ifdef VIMAGE 182 {"vnet", 0, PR_VNET}, 183 #endif 184 #ifdef INET 185 {"ip4", PR_IP4_USER, PR_IP4_USER}, 186 #endif 187 #ifdef INET6 188 {"ip6", PR_IP6_USER, PR_IP6_USER}, 189 #endif 190 }; 191 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 192 193 /* 194 * Make this array full-size so dynamic parameters can be added. 195 * It is protected by prison0.mtx, but lockless reading is allowed 196 * with an atomic check of the flag values. 197 */ 198 static struct bool_flags pr_flag_allow[NBBY * NBPW] = { 199 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME}, 200 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC}, 201 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS}, 202 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS}, 203 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT}, 204 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS}, 205 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF}, 206 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK}, 207 {"allow.reserved_ports", "allow.noreserved_ports", 208 PR_ALLOW_RESERVED_PORTS}, 209 {"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF}, 210 {"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug", 211 PR_ALLOW_UNPRIV_DEBUG}, 212 {"allow.suser", "allow.nosuser", PR_ALLOW_SUSER}, 213 }; 214 static unsigned pr_allow_all = PR_ALLOW_ALL_STATIC; 215 const size_t pr_flag_allow_size = sizeof(pr_flag_allow); 216 217 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \ 218 PR_ALLOW_RESERVED_PORTS | \ 219 PR_ALLOW_UNPRIV_DEBUG | \ 220 PR_ALLOW_SUSER) 221 #define JAIL_DEFAULT_ENFORCE_STATFS 2 222 #define JAIL_DEFAULT_DEVFS_RSNUM 0 223 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 224 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 225 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 226 #if defined(INET) || defined(INET6) 227 static unsigned jail_max_af_ips = 255; 228 #endif 229 230 /* 231 * Initialize the parts of prison0 that can't be static-initialized with 232 * constants. This is called from proc0_init() after creating thread0 cpuset. 233 */ 234 void 235 prison0_init(void) 236 { 237 uint8_t *file, *data; 238 size_t size; 239 240 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 241 prison0.pr_osreldate = osreldate; 242 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 243 244 /* If we have a preloaded hostuuid, use it. */ 245 file = preload_search_by_type(PRISON0_HOSTUUID_MODULE); 246 if (file != NULL) { 247 data = preload_fetch_addr(file); 248 size = preload_fetch_size(file); 249 if (data != NULL) { 250 /* 251 * The preloaded data may include trailing whitespace, almost 252 * certainly a newline; skip over any whitespace or 253 * non-printable characters to be safe. 254 */ 255 while (size > 0 && data[size - 1] <= 0x20) { 256 data[size--] = '\0'; 257 } 258 if (validate_uuid(data, size, NULL, 0) == 0) { 259 (void)strlcpy(prison0.pr_hostuuid, data, 260 size + 1); 261 } else if (bootverbose) { 262 printf("hostuuid: preload data malformed: '%s'", 263 data); 264 } 265 } 266 } 267 if (bootverbose) 268 printf("hostuuid: using %s\n", prison0.pr_hostuuid); 269 } 270 271 /* 272 * struct jail_args { 273 * struct jail *jail; 274 * }; 275 */ 276 int 277 sys_jail(struct thread *td, struct jail_args *uap) 278 { 279 uint32_t version; 280 int error; 281 struct jail j; 282 283 error = copyin(uap->jail, &version, sizeof(uint32_t)); 284 if (error) 285 return (error); 286 287 switch (version) { 288 case 0: 289 { 290 struct jail_v0 j0; 291 292 /* FreeBSD single IPv4 jails. */ 293 bzero(&j, sizeof(struct jail)); 294 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 295 if (error) 296 return (error); 297 j.version = j0.version; 298 j.path = j0.path; 299 j.hostname = j0.hostname; 300 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 301 break; 302 } 303 304 case 1: 305 /* 306 * Version 1 was used by multi-IPv4 jail implementations 307 * that never made it into the official kernel. 308 */ 309 return (EINVAL); 310 311 case 2: /* JAIL_API_VERSION */ 312 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 313 error = copyin(uap->jail, &j, sizeof(struct jail)); 314 if (error) 315 return (error); 316 break; 317 318 default: 319 /* Sci-Fi jails are not supported, sorry. */ 320 return (EINVAL); 321 } 322 return (kern_jail(td, &j)); 323 } 324 325 int 326 kern_jail(struct thread *td, struct jail *j) 327 { 328 struct iovec optiov[2 * (4 + nitems(pr_flag_allow) 329 #ifdef INET 330 + 1 331 #endif 332 #ifdef INET6 333 + 1 334 #endif 335 )]; 336 struct uio opt; 337 char *u_path, *u_hostname, *u_name; 338 struct bool_flags *bf; 339 #ifdef INET 340 uint32_t ip4s; 341 struct in_addr *u_ip4; 342 #endif 343 #ifdef INET6 344 struct in6_addr *u_ip6; 345 #endif 346 size_t tmplen; 347 int error, enforce_statfs; 348 349 bzero(&optiov, sizeof(optiov)); 350 opt.uio_iov = optiov; 351 opt.uio_iovcnt = 0; 352 opt.uio_offset = -1; 353 opt.uio_resid = -1; 354 opt.uio_segflg = UIO_SYSSPACE; 355 opt.uio_rw = UIO_READ; 356 opt.uio_td = td; 357 358 /* Set permissions for top-level jails from sysctls. */ 359 if (!jailed(td->td_ucred)) { 360 for (bf = pr_flag_allow; 361 bf < pr_flag_allow + nitems(pr_flag_allow) && 362 atomic_load_int(&bf->flag) != 0; 363 bf++) { 364 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *, 365 (jail_default_allow & bf->flag) 366 ? bf->name : bf->noname); 367 optiov[opt.uio_iovcnt].iov_len = 368 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 369 opt.uio_iovcnt += 2; 370 } 371 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 372 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 373 opt.uio_iovcnt++; 374 enforce_statfs = jail_default_enforce_statfs; 375 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 376 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 377 opt.uio_iovcnt++; 378 } 379 380 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 381 #ifdef INET 382 ip4s = (j->version == 0) ? 1 : j->ip4s; 383 if (ip4s > jail_max_af_ips) 384 return (EINVAL); 385 tmplen += ip4s * sizeof(struct in_addr); 386 #else 387 if (j->ip4s > 0) 388 return (EINVAL); 389 #endif 390 #ifdef INET6 391 if (j->ip6s > jail_max_af_ips) 392 return (EINVAL); 393 tmplen += j->ip6s * sizeof(struct in6_addr); 394 #else 395 if (j->ip6s > 0) 396 return (EINVAL); 397 #endif 398 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 399 u_hostname = u_path + MAXPATHLEN; 400 u_name = u_hostname + MAXHOSTNAMELEN; 401 #ifdef INET 402 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 403 #endif 404 #ifdef INET6 405 #ifdef INET 406 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 407 #else 408 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 409 #endif 410 #endif 411 optiov[opt.uio_iovcnt].iov_base = "path"; 412 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 413 opt.uio_iovcnt++; 414 optiov[opt.uio_iovcnt].iov_base = u_path; 415 error = copyinstr(j->path, u_path, MAXPATHLEN, 416 &optiov[opt.uio_iovcnt].iov_len); 417 if (error) { 418 free(u_path, M_TEMP); 419 return (error); 420 } 421 opt.uio_iovcnt++; 422 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 423 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 424 opt.uio_iovcnt++; 425 optiov[opt.uio_iovcnt].iov_base = u_hostname; 426 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 427 &optiov[opt.uio_iovcnt].iov_len); 428 if (error) { 429 free(u_path, M_TEMP); 430 return (error); 431 } 432 opt.uio_iovcnt++; 433 if (j->jailname != NULL) { 434 optiov[opt.uio_iovcnt].iov_base = "name"; 435 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 436 opt.uio_iovcnt++; 437 optiov[opt.uio_iovcnt].iov_base = u_name; 438 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 439 &optiov[opt.uio_iovcnt].iov_len); 440 if (error) { 441 free(u_path, M_TEMP); 442 return (error); 443 } 444 opt.uio_iovcnt++; 445 } 446 #ifdef INET 447 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 448 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 449 opt.uio_iovcnt++; 450 optiov[opt.uio_iovcnt].iov_base = u_ip4; 451 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 452 if (j->version == 0) 453 u_ip4->s_addr = j->ip4s; 454 else { 455 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 456 if (error) { 457 free(u_path, M_TEMP); 458 return (error); 459 } 460 } 461 opt.uio_iovcnt++; 462 #endif 463 #ifdef INET6 464 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 465 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 466 opt.uio_iovcnt++; 467 optiov[opt.uio_iovcnt].iov_base = u_ip6; 468 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 469 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 470 if (error) { 471 free(u_path, M_TEMP); 472 return (error); 473 } 474 opt.uio_iovcnt++; 475 #endif 476 KASSERT(opt.uio_iovcnt <= nitems(optiov), 477 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 478 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 479 free(u_path, M_TEMP); 480 return (error); 481 } 482 483 /* 484 * struct jail_set_args { 485 * struct iovec *iovp; 486 * unsigned int iovcnt; 487 * int flags; 488 * }; 489 */ 490 int 491 sys_jail_set(struct thread *td, struct jail_set_args *uap) 492 { 493 struct uio *auio; 494 int error; 495 496 /* Check that we have an even number of iovecs. */ 497 if (uap->iovcnt & 1) 498 return (EINVAL); 499 500 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 501 if (error) 502 return (error); 503 error = kern_jail_set(td, auio, uap->flags); 504 free(auio, M_IOV); 505 return (error); 506 } 507 508 int 509 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 510 { 511 struct nameidata nd; 512 #ifdef INET 513 struct in_addr *ip4; 514 #endif 515 #ifdef INET6 516 struct in6_addr *ip6; 517 #endif 518 struct vfsopt *opt; 519 struct vfsoptlist *opts; 520 struct prison *pr, *deadpr, *inspr, *mypr, *ppr, *tpr; 521 struct vnode *root; 522 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 523 char *g_path, *osrelstr; 524 struct bool_flags *bf; 525 struct jailsys_flags *jsf; 526 #if defined(INET) || defined(INET6) 527 struct prison *tppr; 528 void *op; 529 #endif 530 unsigned long hid; 531 size_t namelen, onamelen, pnamelen; 532 int born, created, cuflags, descend, drflags, enforce; 533 int error, errmsg_len, errmsg_pos; 534 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 535 int jid, jsys, len, level; 536 int childmax, osreldt, rsnum, slevel; 537 #if defined(INET) || defined(INET6) 538 int ii, ij; 539 #endif 540 #ifdef INET 541 int ip4s, redo_ip4; 542 #endif 543 #ifdef INET6 544 int ip6s, redo_ip6; 545 #endif 546 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 547 uint64_t pr_allow_diff; 548 unsigned tallow; 549 char numbuf[12]; 550 551 error = priv_check(td, PRIV_JAIL_SET); 552 if (!error && (flags & JAIL_ATTACH)) 553 error = priv_check(td, PRIV_JAIL_ATTACH); 554 if (error) 555 return (error); 556 mypr = td->td_ucred->cr_prison; 557 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 558 return (EPERM); 559 if (flags & ~JAIL_SET_MASK) 560 return (EINVAL); 561 562 /* 563 * Check all the parameters before committing to anything. Not all 564 * errors can be caught early, but we may as well try. Also, this 565 * takes care of some expensive stuff (path lookup) before getting 566 * the allprison lock. 567 * 568 * XXX Jails are not filesystems, and jail parameters are not mount 569 * options. But it makes more sense to re-use the vfsopt code 570 * than duplicate it under a different name. 571 */ 572 error = vfs_buildopts(optuio, &opts); 573 if (error) 574 return (error); 575 #ifdef INET 576 ip4 = NULL; 577 #endif 578 #ifdef INET6 579 ip6 = NULL; 580 #endif 581 g_path = NULL; 582 583 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 584 if (!cuflags) { 585 error = EINVAL; 586 vfs_opterror(opts, "no valid operation (create or update)"); 587 goto done_errmsg; 588 } 589 590 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 591 if (error == ENOENT) 592 jid = 0; 593 else if (error != 0) 594 goto done_free; 595 596 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 597 if (error == ENOENT) 598 gotslevel = 0; 599 else if (error != 0) 600 goto done_free; 601 else 602 gotslevel = 1; 603 604 error = 605 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 606 if (error == ENOENT) 607 gotchildmax = 0; 608 else if (error != 0) 609 goto done_free; 610 else 611 gotchildmax = 1; 612 613 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 614 if (error == ENOENT) 615 gotenforce = 0; 616 else if (error != 0) 617 goto done_free; 618 else if (enforce < 0 || enforce > 2) { 619 error = EINVAL; 620 goto done_free; 621 } else 622 gotenforce = 1; 623 624 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 625 if (error == ENOENT) 626 gotrsnum = 0; 627 else if (error != 0) 628 goto done_free; 629 else 630 gotrsnum = 1; 631 632 pr_flags = ch_flags = 0; 633 for (bf = pr_flag_bool; 634 bf < pr_flag_bool + nitems(pr_flag_bool); 635 bf++) { 636 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag); 637 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag); 638 } 639 ch_flags |= pr_flags; 640 for (jsf = pr_flag_jailsys; 641 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 642 jsf++) { 643 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys)); 644 if (error == ENOENT) 645 continue; 646 if (error != 0) 647 goto done_free; 648 switch (jsys) { 649 case JAIL_SYS_DISABLE: 650 if (!jsf->disable) { 651 error = EINVAL; 652 goto done_free; 653 } 654 pr_flags |= jsf->disable; 655 break; 656 case JAIL_SYS_NEW: 657 pr_flags |= jsf->new; 658 break; 659 case JAIL_SYS_INHERIT: 660 break; 661 default: 662 error = EINVAL; 663 goto done_free; 664 } 665 ch_flags |= jsf->new | jsf->disable; 666 } 667 if ((flags & (JAIL_CREATE | JAIL_ATTACH)) == JAIL_CREATE 668 && !(pr_flags & PR_PERSIST)) { 669 error = EINVAL; 670 vfs_opterror(opts, "new jail must persist or attach"); 671 goto done_errmsg; 672 } 673 #ifdef VIMAGE 674 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 675 error = EINVAL; 676 vfs_opterror(opts, "vnet cannot be changed after creation"); 677 goto done_errmsg; 678 } 679 #endif 680 #ifdef INET 681 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 682 error = EINVAL; 683 vfs_opterror(opts, "ip4 cannot be changed after creation"); 684 goto done_errmsg; 685 } 686 #endif 687 #ifdef INET6 688 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 689 error = EINVAL; 690 vfs_opterror(opts, "ip6 cannot be changed after creation"); 691 goto done_errmsg; 692 } 693 #endif 694 695 pr_allow = ch_allow = 0; 696 for (bf = pr_flag_allow; 697 bf < pr_flag_allow + nitems(pr_flag_allow) && 698 atomic_load_int(&bf->flag) != 0; 699 bf++) { 700 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag); 701 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag); 702 } 703 ch_allow |= pr_allow; 704 705 error = vfs_getopt(opts, "name", (void **)&name, &len); 706 if (error == ENOENT) 707 name = NULL; 708 else if (error != 0) 709 goto done_free; 710 else { 711 if (len == 0 || name[len - 1] != '\0') { 712 error = EINVAL; 713 goto done_free; 714 } 715 if (len > MAXHOSTNAMELEN) { 716 error = ENAMETOOLONG; 717 goto done_free; 718 } 719 } 720 721 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 722 if (error == ENOENT) 723 host = NULL; 724 else if (error != 0) 725 goto done_free; 726 else { 727 ch_flags |= PR_HOST; 728 pr_flags |= PR_HOST; 729 if (len == 0 || host[len - 1] != '\0') { 730 error = EINVAL; 731 goto done_free; 732 } 733 if (len > MAXHOSTNAMELEN) { 734 error = ENAMETOOLONG; 735 goto done_free; 736 } 737 } 738 739 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 740 if (error == ENOENT) 741 domain = NULL; 742 else if (error != 0) 743 goto done_free; 744 else { 745 ch_flags |= PR_HOST; 746 pr_flags |= PR_HOST; 747 if (len == 0 || domain[len - 1] != '\0') { 748 error = EINVAL; 749 goto done_free; 750 } 751 if (len > MAXHOSTNAMELEN) { 752 error = ENAMETOOLONG; 753 goto done_free; 754 } 755 } 756 757 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 758 if (error == ENOENT) 759 uuid = NULL; 760 else if (error != 0) 761 goto done_free; 762 else { 763 ch_flags |= PR_HOST; 764 pr_flags |= PR_HOST; 765 if (len == 0 || uuid[len - 1] != '\0') { 766 error = EINVAL; 767 goto done_free; 768 } 769 if (len > HOSTUUIDLEN) { 770 error = ENAMETOOLONG; 771 goto done_free; 772 } 773 } 774 775 #ifdef COMPAT_FREEBSD32 776 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 777 uint32_t hid32; 778 779 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 780 hid = hid32; 781 } else 782 #endif 783 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 784 if (error == ENOENT) 785 gothid = 0; 786 else if (error != 0) 787 goto done_free; 788 else { 789 gothid = 1; 790 ch_flags |= PR_HOST; 791 pr_flags |= PR_HOST; 792 } 793 794 #ifdef INET 795 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 796 if (error == ENOENT) 797 ip4s = 0; 798 else if (error != 0) 799 goto done_free; 800 else if (ip4s & (sizeof(*ip4) - 1)) { 801 error = EINVAL; 802 goto done_free; 803 } else { 804 ch_flags |= PR_IP4_USER; 805 pr_flags |= PR_IP4_USER; 806 if (ip4s > 0) { 807 ip4s /= sizeof(*ip4); 808 if (ip4s > jail_max_af_ips) { 809 error = EINVAL; 810 vfs_opterror(opts, "too many IPv4 addresses"); 811 goto done_errmsg; 812 } 813 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 814 bcopy(op, ip4, ip4s * sizeof(*ip4)); 815 /* 816 * IP addresses are all sorted but ip[0] to preserve 817 * the primary IP address as given from userland. 818 * This special IP is used for unbound outgoing 819 * connections as well for "loopback" traffic in case 820 * source address selection cannot find any more fitting 821 * address to connect from. 822 */ 823 if (ip4s > 1) 824 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), 825 prison_qcmp_v4); 826 /* 827 * Check for duplicate addresses and do some simple 828 * zero and broadcast checks. If users give other bogus 829 * addresses it is their problem. 830 * 831 * We do not have to care about byte order for these 832 * checks so we will do them in NBO. 833 */ 834 for (ii = 0; ii < ip4s; ii++) { 835 if (ip4[ii].s_addr == INADDR_ANY || 836 ip4[ii].s_addr == INADDR_BROADCAST) { 837 error = EINVAL; 838 goto done_free; 839 } 840 if ((ii+1) < ip4s && 841 (ip4[0].s_addr == ip4[ii+1].s_addr || 842 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 843 error = EINVAL; 844 goto done_free; 845 } 846 } 847 } 848 } 849 #endif 850 851 #ifdef INET6 852 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 853 if (error == ENOENT) 854 ip6s = 0; 855 else if (error != 0) 856 goto done_free; 857 else if (ip6s & (sizeof(*ip6) - 1)) { 858 error = EINVAL; 859 goto done_free; 860 } else { 861 ch_flags |= PR_IP6_USER; 862 pr_flags |= PR_IP6_USER; 863 if (ip6s > 0) { 864 ip6s /= sizeof(*ip6); 865 if (ip6s > jail_max_af_ips) { 866 error = EINVAL; 867 vfs_opterror(opts, "too many IPv6 addresses"); 868 goto done_errmsg; 869 } 870 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 871 bcopy(op, ip6, ip6s * sizeof(*ip6)); 872 if (ip6s > 1) 873 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), 874 prison_qcmp_v6); 875 for (ii = 0; ii < ip6s; ii++) { 876 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 877 error = EINVAL; 878 goto done_free; 879 } 880 if ((ii+1) < ip6s && 881 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 882 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 883 { 884 error = EINVAL; 885 goto done_free; 886 } 887 } 888 } 889 } 890 #endif 891 892 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 893 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 894 error = EINVAL; 895 vfs_opterror(opts, 896 "vnet jails cannot have IP address restrictions"); 897 goto done_errmsg; 898 } 899 #endif 900 901 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 902 if (error == ENOENT) 903 osrelstr = NULL; 904 else if (error != 0) 905 goto done_free; 906 else { 907 if (flags & JAIL_UPDATE) { 908 error = EINVAL; 909 vfs_opterror(opts, 910 "osrelease cannot be changed after creation"); 911 goto done_errmsg; 912 } 913 if (len == 0 || osrelstr[len - 1] != '\0') { 914 error = EINVAL; 915 goto done_free; 916 } 917 if (len >= OSRELEASELEN) { 918 error = ENAMETOOLONG; 919 vfs_opterror(opts, 920 "osrelease string must be 1-%d bytes long", 921 OSRELEASELEN - 1); 922 goto done_errmsg; 923 } 924 } 925 926 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 927 if (error == ENOENT) 928 osreldt = 0; 929 else if (error != 0) 930 goto done_free; 931 else { 932 if (flags & JAIL_UPDATE) { 933 error = EINVAL; 934 vfs_opterror(opts, 935 "osreldate cannot be changed after creation"); 936 goto done_errmsg; 937 } 938 if (osreldt == 0) { 939 error = EINVAL; 940 vfs_opterror(opts, "osreldate cannot be 0"); 941 goto done_errmsg; 942 } 943 } 944 945 root = NULL; 946 error = vfs_getopt(opts, "path", (void **)&path, &len); 947 if (error == ENOENT) 948 path = NULL; 949 else if (error != 0) 950 goto done_free; 951 else { 952 if (flags & JAIL_UPDATE) { 953 error = EINVAL; 954 vfs_opterror(opts, 955 "path cannot be changed after creation"); 956 goto done_errmsg; 957 } 958 if (len == 0 || path[len - 1] != '\0') { 959 error = EINVAL; 960 goto done_free; 961 } 962 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 963 path, td); 964 error = namei(&nd); 965 if (error) 966 goto done_free; 967 root = nd.ni_vp; 968 NDFREE(&nd, NDF_ONLY_PNBUF); 969 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 970 strlcpy(g_path, path, MAXPATHLEN); 971 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 972 if (error == 0) { 973 path = g_path; 974 } else { 975 /* exit on other errors */ 976 goto done_free; 977 } 978 if (root->v_type != VDIR) { 979 error = ENOTDIR; 980 vput(root); 981 goto done_free; 982 } 983 VOP_UNLOCK(root); 984 } 985 986 /* 987 * Find the specified jail, or at least its parent. 988 * This abuses the file error codes ENOENT and EEXIST. 989 */ 990 pr = NULL; 991 ppr = mypr; 992 inspr = NULL; 993 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 994 namelc = strrchr(name, '.'); 995 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 996 if (*p != '\0') 997 jid = 0; 998 } 999 sx_xlock(&allprison_lock); 1000 drflags = PD_LIST_XLOCKED; 1001 if (jid != 0) { 1002 if (jid < 0) { 1003 error = EINVAL; 1004 vfs_opterror(opts, "negative jid"); 1005 goto done_deref; 1006 } 1007 /* 1008 * See if a requested jid already exists. Keep track of 1009 * where it can be inserted later. 1010 */ 1011 TAILQ_FOREACH(inspr, &allprison, pr_list) { 1012 if (inspr->pr_id < jid) 1013 continue; 1014 if (inspr->pr_id > jid) 1015 break; 1016 pr = inspr; 1017 mtx_lock(&pr->pr_mtx); 1018 drflags |= PD_LOCKED; 1019 inspr = NULL; 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 } 1045 if (!prison_isalive(pr)) { 1046 if (!(flags & JAIL_DYING)) { 1047 error = ENOENT; 1048 vfs_opterror(opts, "jail %d is dying", 1049 jid); 1050 goto done_deref; 1051 } 1052 if ((flags & JAIL_ATTACH) || 1053 (pr_flags & PR_PERSIST)) { 1054 /* 1055 * A dying jail might be resurrected 1056 * (via attach or persist), but first 1057 * it must determine if another jail 1058 * has claimed its name. Accomplish 1059 * this by implicitly re-setting the 1060 * name. 1061 */ 1062 if (name == NULL) 1063 name = prison_name(mypr, pr); 1064 } 1065 } 1066 } else { 1067 /* Update: jid must exist. */ 1068 if (cuflags == JAIL_UPDATE) { 1069 error = ENOENT; 1070 vfs_opterror(opts, "jail %d not found", jid); 1071 goto done_deref; 1072 } 1073 } 1074 } 1075 /* 1076 * If the caller provided a name, look for a jail by that name. 1077 * This has different semantics for creates and updates keyed by jid 1078 * (where the name must not already exist in a different jail), 1079 * and updates keyed by the name itself (where the name must exist 1080 * because that is the jail being updated). 1081 */ 1082 namelc = NULL; 1083 if (name != NULL) { 1084 namelc = strrchr(name, '.'); 1085 if (namelc == NULL) 1086 namelc = name; 1087 else { 1088 /* 1089 * This is a hierarchical name. Split it into the 1090 * parent and child names, and make sure the parent 1091 * exists or matches an already found jail. 1092 */ 1093 if (pr != NULL) { 1094 if (strncmp(name, ppr->pr_name, namelc - name) 1095 || ppr->pr_name[namelc - name] != '\0') { 1096 error = EINVAL; 1097 vfs_opterror(opts, 1098 "cannot change jail's parent"); 1099 goto done_deref; 1100 } 1101 } else { 1102 *namelc = '\0'; 1103 ppr = prison_find_name(mypr, name); 1104 if (ppr == NULL) { 1105 error = ENOENT; 1106 vfs_opterror(opts, 1107 "jail \"%s\" not found", name); 1108 goto done_deref; 1109 } 1110 if (!(flags & JAIL_DYING) && 1111 !prison_isalive(ppr)) { 1112 mtx_unlock(&ppr->pr_mtx); 1113 error = ENOENT; 1114 vfs_opterror(opts, 1115 "jail \"%s\" is dying", name); 1116 goto done_deref; 1117 } 1118 mtx_unlock(&ppr->pr_mtx); 1119 *namelc = '.'; 1120 } 1121 namelc++; 1122 } 1123 if (namelc[0] != '\0') { 1124 pnamelen = 1125 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1126 deadpr = NULL; 1127 FOREACH_PRISON_CHILD(ppr, tpr) { 1128 if (tpr != pr && 1129 !strcmp(tpr->pr_name + pnamelen, namelc)) { 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 mtx_lock(&pr->pr_mtx); 1139 drflags |= PD_LOCKED; 1140 break; 1141 } 1142 /* 1143 * Create, or update(jid): 1144 * name must not exist in an 1145 * active sibling jail. 1146 */ 1147 error = EEXIST; 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 deadpr = tpr; 1156 } 1157 } 1158 } 1159 /* If no active jail is found, use a dying one. */ 1160 if (deadpr != NULL && pr == NULL) { 1161 if (flags & JAIL_DYING) { 1162 pr = deadpr; 1163 mtx_lock(&pr->pr_mtx); 1164 drflags |= PD_LOCKED; 1165 } else if (cuflags == JAIL_UPDATE) { 1166 error = ENOENT; 1167 vfs_opterror(opts, 1168 "jail \"%s\" is dying", name); 1169 goto done_deref; 1170 } 1171 } 1172 /* Update: name must exist if no jid. */ 1173 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1174 error = ENOENT; 1175 vfs_opterror(opts, "jail \"%s\" not found", 1176 name); 1177 goto done_deref; 1178 } 1179 } 1180 } 1181 /* Update: must provide a jid or name. */ 1182 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1183 error = ENOENT; 1184 vfs_opterror(opts, "update specified no jail"); 1185 goto done_deref; 1186 } 1187 1188 /* If there's no prison to update, create a new one and link it in. */ 1189 created = pr == NULL; 1190 if (created) { 1191 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1192 if (tpr->pr_childcount >= tpr->pr_childmax) { 1193 error = EPERM; 1194 vfs_opterror(opts, "prison limit exceeded"); 1195 goto done_deref; 1196 } 1197 prison_hold(ppr); 1198 if (!refcount_acquire_if_not_zero(&ppr->pr_uref)) { 1199 /* This brings the parent back to life. */ 1200 mtx_lock(&ppr->pr_mtx); 1201 refcount_acquire(&ppr->pr_uref); 1202 ppr->pr_state = PRISON_STATE_ALIVE; 1203 mtx_unlock(&ppr->pr_mtx); 1204 error = osd_jail_call(ppr, PR_METHOD_CREATE, opts); 1205 if (error) { 1206 pr = ppr; 1207 drflags |= PD_DEREF | PD_DEUREF; 1208 goto done_deref; 1209 } 1210 } 1211 1212 if (jid == 0 && (jid = get_next_prid(&inspr)) == 0) { 1213 error = EAGAIN; 1214 vfs_opterror(opts, "no available jail IDs"); 1215 pr = ppr; 1216 drflags |= PD_DEREF | PD_DEUREF; 1217 goto done_deref; 1218 } 1219 1220 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1221 pr->pr_state = PRISON_STATE_INVALID; 1222 refcount_init(&pr->pr_ref, 1); 1223 refcount_init(&pr->pr_uref, 0); 1224 drflags |= PD_DEREF; 1225 LIST_INIT(&pr->pr_children); 1226 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1227 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1228 1229 pr->pr_id = jid; 1230 if (inspr != NULL) 1231 TAILQ_INSERT_BEFORE(inspr, pr, pr_list); 1232 else 1233 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1234 1235 pr->pr_parent = ppr; 1236 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1237 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1238 tpr->pr_childcount++; 1239 1240 /* Set some default values, and inherit some from the parent. */ 1241 if (namelc == NULL) 1242 namelc = ""; 1243 if (path == NULL) { 1244 path = "/"; 1245 root = mypr->pr_root; 1246 vref(root); 1247 } 1248 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1249 pr->pr_flags |= PR_HOST; 1250 #if defined(INET) || defined(INET6) 1251 #ifdef VIMAGE 1252 if (!(pr_flags & PR_VNET)) 1253 #endif 1254 { 1255 #ifdef INET 1256 if (!(ch_flags & PR_IP4_USER)) 1257 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1258 else if (!(pr_flags & PR_IP4_USER)) { 1259 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1260 if (ppr->pr_ip4 != NULL) { 1261 pr->pr_ip4s = ppr->pr_ip4s; 1262 pr->pr_ip4 = malloc(pr->pr_ip4s * 1263 sizeof(struct in_addr), M_PRISON, 1264 M_WAITOK); 1265 bcopy(ppr->pr_ip4, pr->pr_ip4, 1266 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1267 } 1268 } 1269 #endif 1270 #ifdef INET6 1271 if (!(ch_flags & PR_IP6_USER)) 1272 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1273 else if (!(pr_flags & PR_IP6_USER)) { 1274 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1275 if (ppr->pr_ip6 != NULL) { 1276 pr->pr_ip6s = ppr->pr_ip6s; 1277 pr->pr_ip6 = malloc(pr->pr_ip6s * 1278 sizeof(struct in6_addr), M_PRISON, 1279 M_WAITOK); 1280 bcopy(ppr->pr_ip6, pr->pr_ip6, 1281 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1282 } 1283 } 1284 #endif 1285 } 1286 #endif 1287 /* Source address selection is always on by default. */ 1288 pr->pr_flags |= _PR_IP_SADDRSEL; 1289 1290 pr->pr_securelevel = ppr->pr_securelevel; 1291 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1292 pr->pr_enforce_statfs = jail_default_enforce_statfs; 1293 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1294 1295 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1296 if (osrelstr == NULL) 1297 strlcpy(pr->pr_osrelease, ppr->pr_osrelease, 1298 sizeof(pr->pr_osrelease)); 1299 else 1300 strlcpy(pr->pr_osrelease, osrelstr, 1301 sizeof(pr->pr_osrelease)); 1302 1303 #ifdef VIMAGE 1304 /* Allocate a new vnet if specified. */ 1305 pr->pr_vnet = (pr_flags & PR_VNET) 1306 ? vnet_alloc() : ppr->pr_vnet; 1307 #endif 1308 /* 1309 * Allocate a dedicated cpuset for each jail. 1310 * Unlike other initial settings, this may return an erorr. 1311 */ 1312 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1313 if (error) 1314 goto done_deref; 1315 1316 mtx_lock(&pr->pr_mtx); 1317 drflags |= PD_LOCKED; 1318 } else { 1319 /* 1320 * Grab a reference for existing prisons, to ensure they 1321 * continue to exist for the duration of the call. 1322 */ 1323 prison_hold(pr); 1324 drflags |= PD_DEREF; 1325 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1326 if ((pr->pr_flags & PR_VNET) && 1327 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1328 error = EINVAL; 1329 vfs_opterror(opts, 1330 "vnet jails cannot have IP address restrictions"); 1331 goto done_deref; 1332 } 1333 #endif 1334 #ifdef INET 1335 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1336 error = EINVAL; 1337 vfs_opterror(opts, 1338 "ip4 cannot be changed after creation"); 1339 goto done_deref; 1340 } 1341 #endif 1342 #ifdef INET6 1343 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1344 error = EINVAL; 1345 vfs_opterror(opts, 1346 "ip6 cannot be changed after creation"); 1347 goto done_deref; 1348 } 1349 #endif 1350 } 1351 1352 /* Do final error checking before setting anything. */ 1353 if (gotslevel) { 1354 if (slevel < ppr->pr_securelevel) { 1355 error = EPERM; 1356 goto done_deref; 1357 } 1358 } 1359 if (gotchildmax) { 1360 if (childmax >= ppr->pr_childmax) { 1361 error = EPERM; 1362 goto done_deref; 1363 } 1364 } 1365 if (gotenforce) { 1366 if (enforce < ppr->pr_enforce_statfs) { 1367 error = EPERM; 1368 goto done_deref; 1369 } 1370 } 1371 if (gotrsnum) { 1372 /* 1373 * devfs_rsnum is a uint16_t 1374 */ 1375 if (rsnum < 0 || rsnum > 65535) { 1376 error = EINVAL; 1377 goto done_deref; 1378 } 1379 /* 1380 * Nested jails always inherit parent's devfs ruleset 1381 */ 1382 if (jailed(td->td_ucred)) { 1383 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1384 error = EPERM; 1385 goto done_deref; 1386 } else 1387 rsnum = ppr->pr_devfs_rsnum; 1388 } 1389 } 1390 #ifdef INET 1391 if (ip4s > 0) { 1392 if (ppr->pr_flags & PR_IP4) { 1393 /* 1394 * Make sure the new set of IP addresses is a 1395 * subset of the parent's list. Don't worry 1396 * about the parent being unlocked, as any 1397 * setting is done with allprison_lock held. 1398 */ 1399 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1400 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1401 break; 1402 if (ij == ppr->pr_ip4s) { 1403 error = EPERM; 1404 goto done_deref; 1405 } 1406 if (ip4s > 1) { 1407 for (ii = ij = 1; ii < ip4s; ii++) { 1408 if (ip4[ii].s_addr == 1409 ppr->pr_ip4[0].s_addr) 1410 continue; 1411 for (; ij < ppr->pr_ip4s; ij++) 1412 if (ip4[ii].s_addr == 1413 ppr->pr_ip4[ij].s_addr) 1414 break; 1415 if (ij == ppr->pr_ip4s) 1416 break; 1417 } 1418 if (ij == ppr->pr_ip4s) { 1419 error = EPERM; 1420 goto done_deref; 1421 } 1422 } 1423 } 1424 /* 1425 * Check for conflicting IP addresses. We permit them 1426 * if there is no more than one IP on each jail. If 1427 * there is a duplicate on a jail with more than one 1428 * IP stop checking and return error. 1429 */ 1430 #ifdef VIMAGE 1431 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1432 if (tppr->pr_flags & PR_VNET) 1433 break; 1434 #else 1435 tppr = &prison0; 1436 #endif 1437 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1438 if (tpr == pr || 1439 #ifdef VIMAGE 1440 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1441 #endif 1442 !prison_isalive(tpr)) { 1443 descend = 0; 1444 continue; 1445 } 1446 if (!(tpr->pr_flags & PR_IP4_USER)) 1447 continue; 1448 descend = 0; 1449 if (tpr->pr_ip4 == NULL || 1450 (ip4s == 1 && tpr->pr_ip4s == 1)) 1451 continue; 1452 for (ii = 0; ii < ip4s; ii++) { 1453 if (prison_check_ip4_locked(tpr, &ip4[ii]) == 1454 0) { 1455 error = EADDRINUSE; 1456 vfs_opterror(opts, 1457 "IPv4 addresses clash"); 1458 goto done_deref; 1459 } 1460 } 1461 } 1462 } 1463 #endif 1464 #ifdef INET6 1465 if (ip6s > 0) { 1466 if (ppr->pr_flags & PR_IP6) { 1467 /* 1468 * Make sure the new set of IP addresses is a 1469 * subset of the parent's list. 1470 */ 1471 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1472 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1473 &ppr->pr_ip6[ij])) 1474 break; 1475 if (ij == ppr->pr_ip6s) { 1476 error = EPERM; 1477 goto done_deref; 1478 } 1479 if (ip6s > 1) { 1480 for (ii = ij = 1; ii < ip6s; ii++) { 1481 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1482 &ppr->pr_ip6[0])) 1483 continue; 1484 for (; ij < ppr->pr_ip6s; ij++) 1485 if (IN6_ARE_ADDR_EQUAL( 1486 &ip6[ii], &ppr->pr_ip6[ij])) 1487 break; 1488 if (ij == ppr->pr_ip6s) 1489 break; 1490 } 1491 if (ij == ppr->pr_ip6s) { 1492 error = EPERM; 1493 goto done_deref; 1494 } 1495 } 1496 } 1497 /* Check for conflicting IP addresses. */ 1498 #ifdef VIMAGE 1499 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 1500 if (tppr->pr_flags & PR_VNET) 1501 break; 1502 #else 1503 tppr = &prison0; 1504 #endif 1505 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1506 if (tpr == pr || 1507 #ifdef VIMAGE 1508 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1509 #endif 1510 !prison_isalive(tpr)) { 1511 descend = 0; 1512 continue; 1513 } 1514 if (!(tpr->pr_flags & PR_IP6_USER)) 1515 continue; 1516 descend = 0; 1517 if (tpr->pr_ip6 == NULL || 1518 (ip6s == 1 && tpr->pr_ip6s == 1)) 1519 continue; 1520 for (ii = 0; ii < ip6s; ii++) { 1521 if (prison_check_ip6_locked(tpr, &ip6[ii]) == 1522 0) { 1523 error = EADDRINUSE; 1524 vfs_opterror(opts, 1525 "IPv6 addresses clash"); 1526 goto done_deref; 1527 } 1528 } 1529 } 1530 } 1531 #endif 1532 onamelen = namelen = 0; 1533 if (namelc != NULL) { 1534 /* Give a default name of the jid. Also allow the name to be 1535 * explicitly the jid - but not any other number, and only in 1536 * normal form (no leading zero/etc). 1537 */ 1538 if (namelc[0] == '\0') 1539 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 1540 else if ((strtoul(namelc, &p, 10) != jid || 1541 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1542 error = EINVAL; 1543 vfs_opterror(opts, 1544 "name cannot be numeric (unless it is the jid)"); 1545 goto done_deref; 1546 } 1547 /* 1548 * Make sure the name isn't too long for the prison or its 1549 * children. 1550 */ 1551 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1552 onamelen = strlen(pr->pr_name + pnamelen); 1553 namelen = strlen(namelc); 1554 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1555 error = ENAMETOOLONG; 1556 goto done_deref; 1557 } 1558 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1559 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1560 sizeof(pr->pr_name)) { 1561 error = ENAMETOOLONG; 1562 goto done_deref; 1563 } 1564 } 1565 } 1566 pr_allow_diff = pr_allow & ~ppr->pr_allow; 1567 if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) { 1568 error = EPERM; 1569 goto done_deref; 1570 } 1571 1572 /* 1573 * Let modules check their parameters. This requires unlocking and 1574 * then re-locking the prison, but this is still a valid state as long 1575 * as allprison_lock remains xlocked. 1576 */ 1577 mtx_unlock(&pr->pr_mtx); 1578 drflags &= ~PD_LOCKED; 1579 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1580 if (error != 0) 1581 goto done_deref; 1582 mtx_lock(&pr->pr_mtx); 1583 drflags |= PD_LOCKED; 1584 1585 /* At this point, all valid parameters should have been noted. */ 1586 TAILQ_FOREACH(opt, opts, link) { 1587 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1588 error = EINVAL; 1589 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1590 goto done_deref; 1591 } 1592 } 1593 1594 /* Set the parameters of the prison. */ 1595 #ifdef INET 1596 redo_ip4 = 0; 1597 if (pr_flags & PR_IP4_USER) { 1598 pr->pr_flags |= PR_IP4; 1599 free(pr->pr_ip4, M_PRISON); 1600 pr->pr_ip4s = ip4s; 1601 pr->pr_ip4 = ip4; 1602 ip4 = NULL; 1603 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1604 #ifdef VIMAGE 1605 if (tpr->pr_flags & PR_VNET) { 1606 descend = 0; 1607 continue; 1608 } 1609 #endif 1610 if (prison_restrict_ip4(tpr, NULL)) { 1611 redo_ip4 = 1; 1612 descend = 0; 1613 } 1614 } 1615 } 1616 #endif 1617 #ifdef INET6 1618 redo_ip6 = 0; 1619 if (pr_flags & PR_IP6_USER) { 1620 pr->pr_flags |= PR_IP6; 1621 free(pr->pr_ip6, M_PRISON); 1622 pr->pr_ip6s = ip6s; 1623 pr->pr_ip6 = ip6; 1624 ip6 = NULL; 1625 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1626 #ifdef VIMAGE 1627 if (tpr->pr_flags & PR_VNET) { 1628 descend = 0; 1629 continue; 1630 } 1631 #endif 1632 if (prison_restrict_ip6(tpr, NULL)) { 1633 redo_ip6 = 1; 1634 descend = 0; 1635 } 1636 } 1637 } 1638 #endif 1639 if (gotslevel) { 1640 pr->pr_securelevel = slevel; 1641 /* Set all child jails to be at least this level. */ 1642 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1643 if (tpr->pr_securelevel < slevel) 1644 tpr->pr_securelevel = slevel; 1645 } 1646 if (gotchildmax) { 1647 pr->pr_childmax = childmax; 1648 /* Set all child jails to under this limit. */ 1649 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1650 if (tpr->pr_childmax > childmax - level) 1651 tpr->pr_childmax = childmax > level 1652 ? childmax - level : 0; 1653 } 1654 if (gotenforce) { 1655 pr->pr_enforce_statfs = enforce; 1656 /* Pass this restriction on to the children. */ 1657 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1658 if (tpr->pr_enforce_statfs < enforce) 1659 tpr->pr_enforce_statfs = enforce; 1660 } 1661 if (gotrsnum) { 1662 pr->pr_devfs_rsnum = rsnum; 1663 /* Pass this restriction on to the children. */ 1664 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1665 tpr->pr_devfs_rsnum = rsnum; 1666 } 1667 if (namelc != NULL) { 1668 if (ppr == &prison0) 1669 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1670 else 1671 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1672 ppr->pr_name, namelc); 1673 /* Change this component of child names. */ 1674 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1675 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1676 strlen(tpr->pr_name + onamelen) + 1); 1677 bcopy(pr->pr_name, tpr->pr_name, namelen); 1678 } 1679 } 1680 if (path != NULL) { 1681 /* Try to keep a real-rooted full pathname. */ 1682 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1683 pr->pr_root = root; 1684 root = NULL; 1685 } 1686 if (PR_HOST & ch_flags & ~pr_flags) { 1687 if (pr->pr_flags & PR_HOST) { 1688 /* 1689 * Copy the parent's host info. As with pr_ip4 above, 1690 * the lack of a lock on the parent is not a problem; 1691 * it is always set with allprison_lock at least 1692 * shared, and is held exclusively here. 1693 */ 1694 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1695 sizeof(pr->pr_hostname)); 1696 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1697 sizeof(pr->pr_domainname)); 1698 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1699 sizeof(pr->pr_hostuuid)); 1700 pr->pr_hostid = pr->pr_parent->pr_hostid; 1701 } 1702 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1703 /* Set this prison, and any descendants without PR_HOST. */ 1704 if (host != NULL) 1705 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1706 if (domain != NULL) 1707 strlcpy(pr->pr_domainname, domain, 1708 sizeof(pr->pr_domainname)); 1709 if (uuid != NULL) 1710 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1711 if (gothid) 1712 pr->pr_hostid = hid; 1713 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1714 if (tpr->pr_flags & PR_HOST) 1715 descend = 0; 1716 else { 1717 if (host != NULL) 1718 strlcpy(tpr->pr_hostname, 1719 pr->pr_hostname, 1720 sizeof(tpr->pr_hostname)); 1721 if (domain != NULL) 1722 strlcpy(tpr->pr_domainname, 1723 pr->pr_domainname, 1724 sizeof(tpr->pr_domainname)); 1725 if (uuid != NULL) 1726 strlcpy(tpr->pr_hostuuid, 1727 pr->pr_hostuuid, 1728 sizeof(tpr->pr_hostuuid)); 1729 if (gothid) 1730 tpr->pr_hostid = hid; 1731 } 1732 } 1733 } 1734 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1735 if ((tallow = ch_allow & ~pr_allow)) 1736 prison_set_allow_locked(pr, tallow, 0); 1737 /* 1738 * Persistent prisons get an extra reference, and prisons losing their 1739 * persist flag lose that reference. 1740 */ 1741 born = !prison_isalive(pr); 1742 if (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags)) { 1743 if (pr_flags & PR_PERSIST) { 1744 prison_hold(pr); 1745 /* 1746 * This may make a dead prison alive again, but wait 1747 * to label it as such until after OSD calls have had 1748 * a chance to run (and perhaps to fail). 1749 */ 1750 refcount_acquire(&pr->pr_uref); 1751 } else { 1752 drflags |= PD_DEUREF; 1753 prison_free_not_last(pr); 1754 } 1755 } 1756 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1757 mtx_unlock(&pr->pr_mtx); 1758 drflags &= ~PD_LOCKED; 1759 1760 #ifdef RACCT 1761 if (racct_enable && created) 1762 prison_racct_attach(pr); 1763 #endif 1764 1765 /* Locks may have prevented a complete restriction of child IP 1766 * addresses. If so, allocate some more memory and try again. 1767 */ 1768 #ifdef INET 1769 while (redo_ip4) { 1770 ip4s = pr->pr_ip4s; 1771 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1772 mtx_lock(&pr->pr_mtx); 1773 redo_ip4 = 0; 1774 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1775 #ifdef VIMAGE 1776 if (tpr->pr_flags & PR_VNET) { 1777 descend = 0; 1778 continue; 1779 } 1780 #endif 1781 if (prison_restrict_ip4(tpr, ip4)) { 1782 if (ip4 != NULL) 1783 ip4 = NULL; 1784 else 1785 redo_ip4 = 1; 1786 } 1787 } 1788 mtx_unlock(&pr->pr_mtx); 1789 } 1790 #endif 1791 #ifdef INET6 1792 while (redo_ip6) { 1793 ip6s = pr->pr_ip6s; 1794 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1795 mtx_lock(&pr->pr_mtx); 1796 redo_ip6 = 0; 1797 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1798 #ifdef VIMAGE 1799 if (tpr->pr_flags & PR_VNET) { 1800 descend = 0; 1801 continue; 1802 } 1803 #endif 1804 if (prison_restrict_ip6(tpr, ip6)) { 1805 if (ip6 != NULL) 1806 ip6 = NULL; 1807 else 1808 redo_ip6 = 1; 1809 } 1810 } 1811 mtx_unlock(&pr->pr_mtx); 1812 } 1813 #endif 1814 1815 /* Let the modules do their work. */ 1816 if (born) { 1817 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1818 if (error) { 1819 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1820 goto done_deref; 1821 } 1822 } 1823 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1824 if (error) { 1825 if (born) 1826 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1827 goto done_deref; 1828 } 1829 1830 /* 1831 * A new prison is now ready to be seen; either it has gained a user 1832 * reference via persistence, or is about to gain one via attachment. 1833 */ 1834 if (born) { 1835 drflags = prison_lock_xlock(pr, drflags); 1836 pr->pr_state = PRISON_STATE_ALIVE; 1837 } 1838 1839 /* Attach this process to the prison if requested. */ 1840 if (flags & JAIL_ATTACH) { 1841 error = do_jail_attach(td, pr, prison_lock_xlock(pr, drflags)); 1842 drflags &= ~(PD_LOCKED | PD_LIST_XLOCKED); 1843 if (error) { 1844 vfs_opterror(opts, "attach failed"); 1845 goto done_deref; 1846 } 1847 } 1848 1849 #ifdef RACCT 1850 if (racct_enable && !created) { 1851 if (drflags & PD_LIST_XLOCKED) { 1852 sx_xunlock(&allprison_lock); 1853 drflags &= ~PD_LIST_XLOCKED; 1854 } 1855 prison_racct_modify(pr); 1856 } 1857 #endif 1858 1859 td->td_retval[0] = pr->pr_id; 1860 1861 done_deref: 1862 /* Release any temporary prison holds and/or locks. */ 1863 if (pr != NULL) 1864 prison_deref(pr, drflags); 1865 else if (drflags & PD_LIST_SLOCKED) 1866 sx_sunlock(&allprison_lock); 1867 else if (drflags & PD_LIST_XLOCKED) 1868 sx_xunlock(&allprison_lock); 1869 if (root != NULL) 1870 vrele(root); 1871 done_errmsg: 1872 if (error) { 1873 /* Write the error message back to userspace. */ 1874 if (vfs_getopt(opts, "errmsg", (void **)&errmsg, 1875 &errmsg_len) == 0 && errmsg_len > 0) { 1876 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1877 if (optuio->uio_segflg == UIO_SYSSPACE) 1878 bcopy(errmsg, 1879 optuio->uio_iov[errmsg_pos].iov_base, 1880 errmsg_len); 1881 else 1882 copyout(errmsg, 1883 optuio->uio_iov[errmsg_pos].iov_base, 1884 errmsg_len); 1885 } 1886 } 1887 done_free: 1888 #ifdef INET 1889 free(ip4, M_PRISON); 1890 #endif 1891 #ifdef INET6 1892 free(ip6, M_PRISON); 1893 #endif 1894 if (g_path != NULL) 1895 free(g_path, M_TEMP); 1896 vfs_freeopts(opts); 1897 return (error); 1898 } 1899 1900 /* 1901 * Find the next available prison ID. Return the ID on success, or zero 1902 * on failure. Also set a pointer to the allprison list entry the prison 1903 * should be inserted before. 1904 */ 1905 static int 1906 get_next_prid(struct prison **insprp) 1907 { 1908 struct prison *inspr; 1909 int jid, maxid; 1910 1911 jid = lastprid % JAIL_MAX + 1; 1912 if (TAILQ_EMPTY(&allprison) || 1913 TAILQ_LAST(&allprison, prisonlist)->pr_id < jid) { 1914 /* 1915 * A common case is for all jails to be implicitly numbered, 1916 * which means they'll go on the end of the list, at least 1917 * for the first JAIL_MAX times. 1918 */ 1919 inspr = NULL; 1920 } else { 1921 /* 1922 * Take two passes through the allprison list: first starting 1923 * with the proposed jid, then ending with it. 1924 */ 1925 for (maxid = JAIL_MAX; maxid != 0; ) { 1926 TAILQ_FOREACH(inspr, &allprison, pr_list) { 1927 if (inspr->pr_id < jid) 1928 continue; 1929 if (inspr->pr_id > jid) { 1930 /* Found an opening. */ 1931 maxid = 0; 1932 break; 1933 } 1934 if (++jid > maxid) { 1935 if (lastprid == maxid || lastprid == 0) 1936 { 1937 /* 1938 * The entire legal range 1939 * has been traversed 1940 */ 1941 return 0; 1942 } 1943 /* Try again from the start. */ 1944 jid = 1; 1945 maxid = lastprid; 1946 break; 1947 } 1948 } 1949 if (inspr == NULL) { 1950 /* Found room at the end of the list. */ 1951 break; 1952 } 1953 } 1954 } 1955 *insprp = inspr; 1956 lastprid = jid; 1957 return (jid); 1958 } 1959 1960 /* 1961 * struct jail_get_args { 1962 * struct iovec *iovp; 1963 * unsigned int iovcnt; 1964 * int flags; 1965 * }; 1966 */ 1967 int 1968 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1969 { 1970 struct uio *auio; 1971 int error; 1972 1973 /* Check that we have an even number of iovecs. */ 1974 if (uap->iovcnt & 1) 1975 return (EINVAL); 1976 1977 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1978 if (error) 1979 return (error); 1980 error = kern_jail_get(td, auio, uap->flags); 1981 if (error == 0) 1982 error = copyout(auio->uio_iov, uap->iovp, 1983 uap->iovcnt * sizeof (struct iovec)); 1984 free(auio, M_IOV); 1985 return (error); 1986 } 1987 1988 int 1989 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1990 { 1991 struct bool_flags *bf; 1992 struct jailsys_flags *jsf; 1993 struct prison *pr, *mypr; 1994 struct vfsopt *opt; 1995 struct vfsoptlist *opts; 1996 char *errmsg, *name; 1997 int drflags, error, errmsg_len, errmsg_pos, i, jid, len, pos; 1998 unsigned f; 1999 2000 if (flags & ~JAIL_GET_MASK) 2001 return (EINVAL); 2002 2003 /* Get the parameter list. */ 2004 error = vfs_buildopts(optuio, &opts); 2005 if (error) 2006 return (error); 2007 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 2008 mypr = td->td_ucred->cr_prison; 2009 pr = NULL; 2010 2011 /* 2012 * Find the prison specified by one of: lastjid, jid, name. 2013 */ 2014 sx_slock(&allprison_lock); 2015 drflags = PD_LIST_SLOCKED; 2016 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 2017 if (error == 0) { 2018 TAILQ_FOREACH(pr, &allprison, pr_list) { 2019 if (pr->pr_id > jid && 2020 ((flags & JAIL_DYING) || prison_isalive(pr)) && 2021 prison_ischild(mypr, pr)) { 2022 mtx_lock(&pr->pr_mtx); 2023 drflags |= PD_LOCKED; 2024 goto found_prison; 2025 } 2026 } 2027 error = ENOENT; 2028 vfs_opterror(opts, "no jail after %d", jid); 2029 goto done; 2030 } else if (error != ENOENT) 2031 goto done; 2032 2033 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 2034 if (error == 0) { 2035 if (jid != 0) { 2036 pr = prison_find_child(mypr, jid); 2037 if (pr != NULL) { 2038 drflags |= PD_LOCKED; 2039 if (!(prison_isalive(pr) || 2040 (flags & JAIL_DYING))) { 2041 error = ENOENT; 2042 vfs_opterror(opts, "jail %d is dying", 2043 jid); 2044 goto done; 2045 } 2046 goto found_prison; 2047 } 2048 error = ENOENT; 2049 vfs_opterror(opts, "jail %d not found", jid); 2050 goto done; 2051 } 2052 } else if (error != ENOENT) 2053 goto done; 2054 2055 error = vfs_getopt(opts, "name", (void **)&name, &len); 2056 if (error == 0) { 2057 if (len == 0 || name[len - 1] != '\0') { 2058 error = EINVAL; 2059 goto done; 2060 } 2061 pr = prison_find_name(mypr, name); 2062 if (pr != NULL) { 2063 drflags |= PD_LOCKED; 2064 if (!(prison_isalive(pr) || (flags & JAIL_DYING))) { 2065 error = ENOENT; 2066 vfs_opterror(opts, "jail \"%s\" is dying", 2067 name); 2068 goto done; 2069 } 2070 goto found_prison; 2071 } 2072 error = ENOENT; 2073 vfs_opterror(opts, "jail \"%s\" not found", name); 2074 goto done; 2075 } else if (error != ENOENT) 2076 goto done; 2077 2078 vfs_opterror(opts, "no jail specified"); 2079 error = ENOENT; 2080 goto done; 2081 2082 found_prison: 2083 /* Get the parameters of the prison. */ 2084 prison_hold(pr); 2085 drflags |= PD_DEREF; 2086 td->td_retval[0] = pr->pr_id; 2087 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2088 if (error != 0 && error != ENOENT) 2089 goto done; 2090 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2091 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2092 if (error != 0 && error != ENOENT) 2093 goto done; 2094 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2095 if (error != 0 && error != ENOENT) 2096 goto done; 2097 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2098 sizeof(pr->pr_cpuset->cs_id)); 2099 if (error != 0 && error != ENOENT) 2100 goto done; 2101 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2102 if (error != 0 && error != ENOENT) 2103 goto done; 2104 #ifdef INET 2105 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2106 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2107 if (error != 0 && error != ENOENT) 2108 goto done; 2109 #endif 2110 #ifdef INET6 2111 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2112 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2113 if (error != 0 && error != ENOENT) 2114 goto done; 2115 #endif 2116 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2117 sizeof(pr->pr_securelevel)); 2118 if (error != 0 && error != ENOENT) 2119 goto done; 2120 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2121 sizeof(pr->pr_childcount)); 2122 if (error != 0 && error != ENOENT) 2123 goto done; 2124 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2125 sizeof(pr->pr_childmax)); 2126 if (error != 0 && error != ENOENT) 2127 goto done; 2128 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2129 if (error != 0 && error != ENOENT) 2130 goto done; 2131 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2132 if (error != 0 && error != ENOENT) 2133 goto done; 2134 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2135 if (error != 0 && error != ENOENT) 2136 goto done; 2137 #ifdef COMPAT_FREEBSD32 2138 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2139 uint32_t hid32 = pr->pr_hostid; 2140 2141 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2142 } else 2143 #endif 2144 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2145 sizeof(pr->pr_hostid)); 2146 if (error != 0 && error != ENOENT) 2147 goto done; 2148 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2149 sizeof(pr->pr_enforce_statfs)); 2150 if (error != 0 && error != ENOENT) 2151 goto done; 2152 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2153 sizeof(pr->pr_devfs_rsnum)); 2154 if (error != 0 && error != ENOENT) 2155 goto done; 2156 for (bf = pr_flag_bool; 2157 bf < pr_flag_bool + nitems(pr_flag_bool); 2158 bf++) { 2159 i = (pr->pr_flags & bf->flag) ? 1 : 0; 2160 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2161 if (error != 0 && error != ENOENT) 2162 goto done; 2163 i = !i; 2164 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2165 if (error != 0 && error != ENOENT) 2166 goto done; 2167 } 2168 for (jsf = pr_flag_jailsys; 2169 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 2170 jsf++) { 2171 f = pr->pr_flags & (jsf->disable | jsf->new); 2172 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE 2173 : (f == jsf->new) ? JAIL_SYS_NEW 2174 : JAIL_SYS_INHERIT; 2175 error = vfs_setopt(opts, jsf->name, &i, sizeof(i)); 2176 if (error != 0 && error != ENOENT) 2177 goto done; 2178 } 2179 for (bf = pr_flag_allow; 2180 bf < pr_flag_allow + nitems(pr_flag_allow) && 2181 atomic_load_int(&bf->flag) != 0; 2182 bf++) { 2183 i = (pr->pr_allow & bf->flag) ? 1 : 0; 2184 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2185 if (error != 0 && error != ENOENT) 2186 goto done; 2187 i = !i; 2188 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2189 if (error != 0 && error != ENOENT) 2190 goto done; 2191 } 2192 i = !prison_isalive(pr); 2193 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2194 if (error != 0 && error != ENOENT) 2195 goto done; 2196 i = !i; 2197 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2198 if (error != 0 && error != ENOENT) 2199 goto done; 2200 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2201 sizeof(pr->pr_osreldate)); 2202 if (error != 0 && error != ENOENT) 2203 goto done; 2204 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2205 if (error != 0 && error != ENOENT) 2206 goto done; 2207 2208 /* Get the module parameters. */ 2209 mtx_unlock(&pr->pr_mtx); 2210 drflags &= ~PD_LOCKED; 2211 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2212 if (error) 2213 goto done; 2214 prison_deref(pr, drflags); 2215 pr = NULL; 2216 drflags = 0; 2217 2218 /* By now, all parameters should have been noted. */ 2219 TAILQ_FOREACH(opt, opts, link) { 2220 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2221 error = EINVAL; 2222 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2223 goto done; 2224 } 2225 } 2226 2227 /* Write the fetched parameters back to userspace. */ 2228 error = 0; 2229 TAILQ_FOREACH(opt, opts, link) { 2230 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2231 pos = 2 * opt->pos + 1; 2232 optuio->uio_iov[pos].iov_len = opt->len; 2233 if (opt->value != NULL) { 2234 if (optuio->uio_segflg == UIO_SYSSPACE) { 2235 bcopy(opt->value, 2236 optuio->uio_iov[pos].iov_base, 2237 opt->len); 2238 } else { 2239 error = copyout(opt->value, 2240 optuio->uio_iov[pos].iov_base, 2241 opt->len); 2242 if (error) 2243 break; 2244 } 2245 } 2246 } 2247 } 2248 2249 done: 2250 /* Release any temporary prison holds and/or locks. */ 2251 if (pr != NULL) 2252 prison_deref(pr, drflags); 2253 else if (drflags & PD_LIST_SLOCKED) 2254 sx_sunlock(&allprison_lock); 2255 if (error && errmsg_pos >= 0) { 2256 /* Write the error message back to userspace. */ 2257 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2258 errmsg_pos = 2 * errmsg_pos + 1; 2259 if (errmsg_len > 0) { 2260 if (optuio->uio_segflg == UIO_SYSSPACE) 2261 bcopy(errmsg, 2262 optuio->uio_iov[errmsg_pos].iov_base, 2263 errmsg_len); 2264 else 2265 copyout(errmsg, 2266 optuio->uio_iov[errmsg_pos].iov_base, 2267 errmsg_len); 2268 } 2269 } 2270 vfs_freeopts(opts); 2271 return (error); 2272 } 2273 2274 /* 2275 * struct jail_remove_args { 2276 * int jid; 2277 * }; 2278 */ 2279 int 2280 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2281 { 2282 struct prison *pr, *cpr, *lpr; 2283 int descend, error; 2284 2285 error = priv_check(td, PRIV_JAIL_REMOVE); 2286 if (error) 2287 return (error); 2288 2289 sx_xlock(&allprison_lock); 2290 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2291 if (pr == NULL) { 2292 sx_xunlock(&allprison_lock); 2293 return (EINVAL); 2294 } 2295 2296 /* Remove all descendants of this prison, then remove this prison. */ 2297 prison_hold(pr); 2298 if (!LIST_EMPTY(&pr->pr_children)) { 2299 mtx_unlock(&pr->pr_mtx); 2300 lpr = NULL; 2301 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2302 prison_hold(cpr); 2303 if (lpr != NULL) { 2304 mtx_lock(&lpr->pr_mtx); 2305 prison_remove_one(lpr); 2306 sx_xlock(&allprison_lock); 2307 } 2308 lpr = cpr; 2309 } 2310 if (lpr != NULL) { 2311 mtx_lock(&lpr->pr_mtx); 2312 prison_remove_one(lpr); 2313 sx_xlock(&allprison_lock); 2314 } 2315 mtx_lock(&pr->pr_mtx); 2316 } 2317 prison_remove_one(pr); 2318 return (0); 2319 } 2320 2321 static void 2322 prison_remove_one(struct prison *pr) 2323 { 2324 struct proc *p; 2325 int was_alive, drflags; 2326 2327 drflags = PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED; 2328 2329 /* 2330 * Mark the prison as doomed, so it doesn't accidentally come back 2331 * to life. It may still be explicitly brought back by jail_set(2). 2332 */ 2333 was_alive = pr->pr_state == PRISON_STATE_ALIVE; 2334 pr->pr_state = PRISON_STATE_DYING; 2335 2336 /* If the prison was persistent, it is not anymore. */ 2337 if (pr->pr_flags & PR_PERSIST) { 2338 drflags |= PD_DEUREF; 2339 prison_free_not_last(pr); 2340 pr->pr_flags &= ~PR_PERSIST; 2341 } 2342 2343 /* 2344 * jail_remove added a reference. If that's the only one, remove 2345 * the prison now. refcount(9) doesn't guarantee the cache coherence 2346 * of non-zero counters, so force it here. 2347 */ 2348 KASSERT(refcount_load(&pr->pr_ref) > 0, 2349 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2350 if (atomic_load_acq_int(&pr->pr_ref) == 1) { 2351 prison_deref(pr, drflags); 2352 return; 2353 } 2354 2355 /* Tell modules this prison has died. */ 2356 mtx_unlock(&pr->pr_mtx); 2357 drflags &= ~PD_LOCKED; 2358 if (was_alive) 2359 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 2360 2361 sx_xunlock(&allprison_lock); 2362 drflags &= ~PD_LIST_XLOCKED; 2363 /* 2364 * Kill all processes unfortunate enough to be attached to this prison. 2365 */ 2366 sx_slock(&allproc_lock); 2367 FOREACH_PROC_IN_SYSTEM(p) { 2368 PROC_LOCK(p); 2369 if (p->p_state != PRS_NEW && p->p_ucred && 2370 p->p_ucred->cr_prison == pr) 2371 kern_psignal(p, SIGKILL); 2372 PROC_UNLOCK(p); 2373 } 2374 sx_sunlock(&allproc_lock); 2375 /* Remove the temporary reference added by jail_remove. */ 2376 prison_deref(pr, drflags); 2377 } 2378 2379 /* 2380 * struct jail_attach_args { 2381 * int jid; 2382 * }; 2383 */ 2384 int 2385 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2386 { 2387 struct prison *pr; 2388 int error; 2389 2390 error = priv_check(td, PRIV_JAIL_ATTACH); 2391 if (error) 2392 return (error); 2393 2394 sx_slock(&allprison_lock); 2395 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2396 if (pr == NULL) { 2397 sx_sunlock(&allprison_lock); 2398 return (EINVAL); 2399 } 2400 2401 /* Do not allow a process to attach to a prison that is not alive. */ 2402 if (!prison_isalive(pr)) { 2403 mtx_unlock(&pr->pr_mtx); 2404 sx_sunlock(&allprison_lock); 2405 return (EINVAL); 2406 } 2407 2408 return (do_jail_attach(td, pr, PD_LOCKED | PD_LIST_SLOCKED)); 2409 } 2410 2411 static int 2412 do_jail_attach(struct thread *td, struct prison *pr, int drflags) 2413 { 2414 struct proc *p; 2415 struct ucred *newcred, *oldcred; 2416 int error; 2417 2418 mtx_assert(&pr->pr_mtx, MA_OWNED); 2419 sx_assert(&allprison_lock, SX_LOCKED); 2420 /* 2421 * XXX: Note that there is a slight race here if two threads 2422 * in the same privileged process attempt to attach to two 2423 * different jails at the same time. It is important for 2424 * user processes not to do this, or they might end up with 2425 * a process root from one prison, but attached to the jail 2426 * of another. 2427 */ 2428 prison_hold(pr); 2429 refcount_acquire(&pr->pr_uref); 2430 drflags |= PD_DEREF | PD_DEUREF; 2431 mtx_unlock(&pr->pr_mtx); 2432 drflags &= ~PD_LOCKED; 2433 2434 /* Let modules do whatever they need to prepare for attaching. */ 2435 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2436 if (error) { 2437 prison_deref(pr, drflags); 2438 return (error); 2439 } 2440 sx_unlock(&allprison_lock); 2441 drflags &= ~(PD_LIST_SLOCKED | PD_LIST_XLOCKED); 2442 2443 /* 2444 * Reparent the newly attached process to this jail. 2445 */ 2446 p = td->td_proc; 2447 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2448 if (error) 2449 goto e_revert_osd; 2450 2451 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2452 if ((error = change_dir(pr->pr_root, td)) != 0) 2453 goto e_unlock; 2454 #ifdef MAC 2455 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2456 goto e_unlock; 2457 #endif 2458 VOP_UNLOCK(pr->pr_root); 2459 if ((error = pwd_chroot_chdir(td, pr->pr_root))) 2460 goto e_revert_osd; 2461 2462 newcred = crget(); 2463 PROC_LOCK(p); 2464 oldcred = crcopysafe(p, newcred); 2465 newcred->cr_prison = pr; 2466 proc_set_cred(p, newcred); 2467 setsugid(p); 2468 #ifdef RACCT 2469 racct_proc_ucred_changed(p, oldcred, newcred); 2470 crhold(newcred); 2471 #endif 2472 PROC_UNLOCK(p); 2473 #ifdef RCTL 2474 rctl_proc_ucred_changed(p, newcred); 2475 crfree(newcred); 2476 #endif 2477 prison_deref(oldcred->cr_prison, drflags); 2478 crfree(oldcred); 2479 2480 /* 2481 * If the prison was killed while changing credentials, die along 2482 * with it. 2483 */ 2484 if (!prison_isalive(pr)) { 2485 PROC_LOCK(p); 2486 kern_psignal(p, SIGKILL); 2487 PROC_UNLOCK(p); 2488 } 2489 2490 return (0); 2491 2492 e_unlock: 2493 VOP_UNLOCK(pr->pr_root); 2494 e_revert_osd: 2495 /* Tell modules this thread is still in its old jail after all. */ 2496 sx_slock(&allprison_lock); 2497 drflags |= PD_LIST_SLOCKED; 2498 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2499 prison_deref(pr, drflags); 2500 return (error); 2501 } 2502 2503 /* 2504 * Returns a locked prison instance, or NULL on failure. 2505 */ 2506 struct prison * 2507 prison_find(int prid) 2508 { 2509 struct prison *pr; 2510 2511 sx_assert(&allprison_lock, SX_LOCKED); 2512 TAILQ_FOREACH(pr, &allprison, pr_list) { 2513 if (pr->pr_id < prid) 2514 continue; 2515 if (pr->pr_id > prid) 2516 break; 2517 KASSERT(prison_isvalid(pr), ("Found invalid prison %p", pr)); 2518 mtx_lock(&pr->pr_mtx); 2519 return (pr); 2520 } 2521 return (NULL); 2522 } 2523 2524 /* 2525 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2526 */ 2527 struct prison * 2528 prison_find_child(struct prison *mypr, int prid) 2529 { 2530 struct prison *pr; 2531 int descend; 2532 2533 sx_assert(&allprison_lock, SX_LOCKED); 2534 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2535 if (pr->pr_id == prid) { 2536 KASSERT(prison_isvalid(pr), 2537 ("Found invalid prison %p", pr)); 2538 mtx_lock(&pr->pr_mtx); 2539 return (pr); 2540 } 2541 } 2542 return (NULL); 2543 } 2544 2545 /* 2546 * Look for the name relative to mypr. Returns a locked prison or NULL. 2547 */ 2548 struct prison * 2549 prison_find_name(struct prison *mypr, const char *name) 2550 { 2551 struct prison *pr, *deadpr; 2552 size_t mylen; 2553 int descend; 2554 2555 sx_assert(&allprison_lock, SX_LOCKED); 2556 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2557 deadpr = NULL; 2558 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2559 if (!strcmp(pr->pr_name + mylen, name)) { 2560 KASSERT(prison_isvalid(pr), 2561 ("Found invalid prison %p", pr)); 2562 if (prison_isalive(pr)) { 2563 mtx_lock(&pr->pr_mtx); 2564 return (pr); 2565 } 2566 deadpr = pr; 2567 } 2568 } 2569 /* There was no valid prison - perhaps there was a dying one. */ 2570 if (deadpr != NULL) 2571 mtx_lock(&deadpr->pr_mtx); 2572 return (deadpr); 2573 } 2574 2575 /* 2576 * See if a prison has the specific flag set. The prison should be locked, 2577 * unless checking for flags that are only set at jail creation (such as 2578 * PR_IP4 and PR_IP6), or only the single bit is examined, without regard 2579 * to any other prison data. 2580 */ 2581 int 2582 prison_flag(struct ucred *cred, unsigned flag) 2583 { 2584 2585 return (cred->cr_prison->pr_flags & flag); 2586 } 2587 2588 int 2589 prison_allow(struct ucred *cred, unsigned flag) 2590 { 2591 2592 return ((cred->cr_prison->pr_allow & flag) != 0); 2593 } 2594 2595 /* 2596 * Hold a prison reference, by incrementing pr_ref. It is generally 2597 * an error to hold a prison that does not already have a reference. 2598 * A prison record will remain valid as long as it has at least one 2599 * reference, and will not be removed as long as either the prison 2600 * mutex or the allprison lock is held (allprison_lock may be shared). 2601 */ 2602 void 2603 prison_hold_locked(struct prison *pr) 2604 { 2605 2606 /* Locking is no longer required. */ 2607 prison_hold(pr); 2608 } 2609 2610 void 2611 prison_hold(struct prison *pr) 2612 { 2613 #ifdef INVARIANTS 2614 int was_valid = refcount_acquire_if_not_zero(&pr->pr_ref); 2615 2616 KASSERT(was_valid, 2617 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id)); 2618 #else 2619 refcount_acquire(&pr->pr_ref); 2620 #endif 2621 } 2622 2623 /* 2624 * Remove a prison reference. If that was the last reference, the 2625 * prison will be removed (at a later time). 2626 */ 2627 void 2628 prison_free_locked(struct prison *pr) 2629 { 2630 2631 mtx_assert(&pr->pr_mtx, MA_OWNED); 2632 /* 2633 * Locking is no longer required, but unlock because the caller 2634 * expects it. 2635 */ 2636 mtx_unlock(&pr->pr_mtx); 2637 prison_free(pr); 2638 } 2639 2640 void 2641 prison_free(struct prison *pr) 2642 { 2643 2644 KASSERT(refcount_load(&pr->pr_ref) > 0, 2645 ("Trying to free dead prison %p (jid=%d).", 2646 pr, pr->pr_id)); 2647 if (!refcount_release_if_not_last(&pr->pr_ref)) { 2648 /* 2649 * Don't remove the last reference in this context, 2650 * in case there are locks held. 2651 */ 2652 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2653 } 2654 } 2655 2656 static void 2657 prison_free_not_last(struct prison *pr) 2658 { 2659 #ifdef INVARIANTS 2660 int lastref; 2661 2662 KASSERT(refcount_load(&pr->pr_ref) > 0, 2663 ("Trying to free dead prison %p (jid=%d).", 2664 pr, pr->pr_id)); 2665 lastref = refcount_release(&pr->pr_ref); 2666 KASSERT(!lastref, 2667 ("prison_free_not_last freed last ref on prison %p (jid=%d).", 2668 pr, pr->pr_id)); 2669 #else 2670 refcount_release(&pr->pr_ref); 2671 #endif 2672 } 2673 2674 /* 2675 * Hold a a prison for user visibility, by incrementing pr_uref. 2676 * It is generally an error to hold a prison that isn't already 2677 * user-visible, except through the the jail system calls. It is also 2678 * an error to hold an invalid prison. A prison record will remain 2679 * alive as long as it has at least one user reference, and will not 2680 * be set to the dying state until the prison mutex and allprison_lock 2681 * are both freed. 2682 */ 2683 void 2684 prison_proc_hold(struct prison *pr) 2685 { 2686 #ifdef INVARIANTS 2687 int was_alive = refcount_acquire_if_not_zero(&pr->pr_uref); 2688 2689 KASSERT(was_alive, 2690 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2691 #else 2692 refcount_acquire(&pr->pr_uref); 2693 #endif 2694 } 2695 2696 /* 2697 * Remove a prison user reference. If it was the last reference, the 2698 * prison will be considered "dying", and may be removed once all of 2699 * its references are dropped. 2700 */ 2701 void 2702 prison_proc_free(struct prison *pr) 2703 { 2704 2705 /* 2706 * Locking is only required when releasing the last reference. 2707 * This allows assurance that a locked prison will remain alive 2708 * until it is unlocked. 2709 */ 2710 KASSERT(refcount_load(&pr->pr_uref) > 0, 2711 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2712 if (!refcount_release_if_not_last(&pr->pr_uref)) { 2713 /* 2714 * Don't remove the last user reference in this context, 2715 * which is expected to be a process that is not only locked, 2716 * but also half dead. Add a reference so any calls to 2717 * prison_free() won't re-submit the task. 2718 */ 2719 prison_hold(pr); 2720 mtx_lock(&pr->pr_mtx); 2721 KASSERT(!(pr->pr_flags & PR_COMPLETE_PROC), 2722 ("Redundant last reference in prison_proc_free (jid=%d)", 2723 pr->pr_id)); 2724 pr->pr_flags |= PR_COMPLETE_PROC; 2725 mtx_unlock(&pr->pr_mtx); 2726 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2727 } 2728 } 2729 2730 /* 2731 * Complete a call to either prison_free or prison_proc_free. 2732 */ 2733 static void 2734 prison_complete(void *context, int pending) 2735 { 2736 struct prison *pr = context; 2737 int drflags; 2738 2739 /* 2740 * This could be called to release the last reference, or the last 2741 * user reference (plus the reference held in prison_proc_free). 2742 */ 2743 drflags = prison_lock_xlock(pr, PD_DEREF); 2744 if (pr->pr_flags & PR_COMPLETE_PROC) { 2745 pr->pr_flags &= ~PR_COMPLETE_PROC; 2746 drflags |= PD_DEUREF; 2747 } 2748 prison_deref(pr, drflags); 2749 } 2750 2751 /* 2752 * Remove a prison reference and/or user reference (usually). 2753 * This assumes context that allows sleeping (for allprison_lock), 2754 * with no non-sleeping locks held, except perhaps the prison itself. 2755 * If there are no more references, release and delist the prison. 2756 * On completion, the prison lock and the allprison lock are both 2757 * unlocked. 2758 */ 2759 static void 2760 prison_deref(struct prison *pr, int flags) 2761 { 2762 struct prisonlist freeprison; 2763 struct prison *rpr, *ppr, *tpr; 2764 2765 TAILQ_INIT(&freeprison); 2766 /* 2767 * Release this prison as requested, which may cause its parent 2768 * to be released, and then maybe its grandparent, etc. 2769 */ 2770 for (;;) { 2771 if (flags & PD_DEUREF) { 2772 /* Drop a user reference. */ 2773 KASSERT(refcount_load(&pr->pr_uref) > 0, 2774 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 2775 pr->pr_id)); 2776 if (!refcount_release_if_not_last(&pr->pr_uref)) { 2777 if (!(flags & PD_DEREF)) { 2778 prison_hold(pr); 2779 flags |= PD_DEREF; 2780 } 2781 flags = prison_lock_xlock(pr, flags); 2782 if (refcount_release(&pr->pr_uref) && 2783 pr->pr_state == PRISON_STATE_ALIVE) { 2784 /* 2785 * When the last user references goes, 2786 * this becomes a dying prison. 2787 */ 2788 KASSERT( 2789 refcount_load(&prison0.pr_uref) > 0, 2790 ("prison0 pr_uref=0")); 2791 pr->pr_state = PRISON_STATE_DYING; 2792 mtx_unlock(&pr->pr_mtx); 2793 flags &= ~PD_LOCKED; 2794 (void)osd_jail_call(pr, 2795 PR_METHOD_REMOVE, NULL); 2796 } 2797 } 2798 } 2799 if (flags & PD_DEREF) { 2800 /* Drop a reference. */ 2801 KASSERT(refcount_load(&pr->pr_ref) > 0, 2802 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 2803 pr->pr_id)); 2804 if (!refcount_release_if_not_last(&pr->pr_ref)) { 2805 flags = prison_lock_xlock(pr, flags); 2806 if (refcount_release(&pr->pr_ref)) { 2807 /* 2808 * When the last reference goes, 2809 * unlink the prison and set it aside. 2810 */ 2811 KASSERT( 2812 refcount_load(&pr->pr_uref) == 0, 2813 ("prison_deref: last ref, " 2814 "but still has %d urefs (jid=%d)", 2815 pr->pr_uref, pr->pr_id)); 2816 KASSERT( 2817 refcount_load(&prison0.pr_ref) != 0, 2818 ("prison0 pr_ref=0")); 2819 pr->pr_state = PRISON_STATE_INVALID; 2820 TAILQ_REMOVE(&allprison, pr, pr_list); 2821 LIST_REMOVE(pr, pr_sibling); 2822 TAILQ_INSERT_TAIL(&freeprison, pr, 2823 pr_list); 2824 for (ppr = pr->pr_parent; 2825 ppr != NULL; 2826 ppr = ppr->pr_parent) 2827 ppr->pr_childcount--; 2828 /* 2829 * Removing a prison frees references 2830 * from its parent. 2831 */ 2832 mtx_unlock(&pr->pr_mtx); 2833 flags &= ~PD_LOCKED; 2834 pr = pr->pr_parent; 2835 flags |= PD_DEREF | PD_DEUREF; 2836 continue; 2837 } 2838 } 2839 } 2840 break; 2841 } 2842 2843 /* Release all the prison locks. */ 2844 if (flags & PD_LOCKED) 2845 mtx_unlock(&pr->pr_mtx); 2846 if (flags & PD_LIST_SLOCKED) 2847 sx_sunlock(&allprison_lock); 2848 else if (flags & PD_LIST_XLOCKED) 2849 sx_xunlock(&allprison_lock); 2850 2851 /* 2852 * Finish removing any unreferenced prisons, which couldn't happen 2853 * while allprison_lock was held (to avoid a LOR on vrele). 2854 */ 2855 TAILQ_FOREACH_SAFE(rpr, &freeprison, pr_list, tpr) { 2856 #ifdef VIMAGE 2857 if (rpr->pr_vnet != rpr->pr_parent->pr_vnet) 2858 vnet_destroy(rpr->pr_vnet); 2859 #endif 2860 if (rpr->pr_root != NULL) 2861 vrele(rpr->pr_root); 2862 mtx_destroy(&rpr->pr_mtx); 2863 #ifdef INET 2864 free(rpr->pr_ip4, M_PRISON); 2865 #endif 2866 #ifdef INET6 2867 free(rpr->pr_ip6, M_PRISON); 2868 #endif 2869 if (rpr->pr_cpuset != NULL) 2870 cpuset_rel(rpr->pr_cpuset); 2871 osd_jail_exit(rpr); 2872 #ifdef RACCT 2873 if (racct_enable) 2874 prison_racct_detach(rpr); 2875 #endif 2876 TAILQ_REMOVE(&freeprison, rpr, pr_list); 2877 free(rpr, M_PRISON); 2878 } 2879 } 2880 2881 /* 2882 * Given the current locking state in the flags, make sure allprison_lock 2883 * is held exclusive, and the prison is locked. Return flags indicating 2884 * the new state. 2885 */ 2886 static int 2887 prison_lock_xlock(struct prison *pr, int flags) 2888 { 2889 2890 if (!(flags & PD_LIST_XLOCKED)) { 2891 /* 2892 * Get allprison_lock, which may be an upgrade, 2893 * and may require unlocking the prison. 2894 */ 2895 if (flags & PD_LOCKED) { 2896 mtx_unlock(&pr->pr_mtx); 2897 flags &= ~PD_LOCKED; 2898 } 2899 if (flags & PD_LIST_SLOCKED) { 2900 if (!sx_try_upgrade(&allprison_lock)) { 2901 sx_sunlock(&allprison_lock); 2902 sx_xlock(&allprison_lock); 2903 } 2904 flags &= ~PD_LIST_SLOCKED; 2905 } else 2906 sx_xlock(&allprison_lock); 2907 flags |= PD_LIST_XLOCKED; 2908 } 2909 if (!(flags & PD_LOCKED)) { 2910 /* Lock the prison mutex. */ 2911 mtx_lock(&pr->pr_mtx); 2912 flags |= PD_LOCKED; 2913 } 2914 return flags; 2915 } 2916 2917 /* 2918 * Set or clear a permission bit in the pr_allow field, passing restrictions 2919 * (cleared permission) down to child jails. 2920 */ 2921 void 2922 prison_set_allow(struct ucred *cred, unsigned flag, int enable) 2923 { 2924 struct prison *pr; 2925 2926 pr = cred->cr_prison; 2927 sx_slock(&allprison_lock); 2928 mtx_lock(&pr->pr_mtx); 2929 prison_set_allow_locked(pr, flag, enable); 2930 mtx_unlock(&pr->pr_mtx); 2931 sx_sunlock(&allprison_lock); 2932 } 2933 2934 static void 2935 prison_set_allow_locked(struct prison *pr, unsigned flag, int enable) 2936 { 2937 struct prison *cpr; 2938 int descend; 2939 2940 if (enable != 0) 2941 pr->pr_allow |= flag; 2942 else { 2943 pr->pr_allow &= ~flag; 2944 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 2945 cpr->pr_allow &= ~flag; 2946 } 2947 } 2948 2949 /* 2950 * Check if a jail supports the given address family. 2951 * 2952 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 2953 * if not. 2954 */ 2955 int 2956 prison_check_af(struct ucred *cred, int af) 2957 { 2958 struct prison *pr; 2959 int error; 2960 2961 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2962 2963 pr = cred->cr_prison; 2964 #ifdef VIMAGE 2965 /* Prisons with their own network stack are not limited. */ 2966 if (prison_owns_vnet(cred)) 2967 return (0); 2968 #endif 2969 2970 error = 0; 2971 switch (af) 2972 { 2973 #ifdef INET 2974 case AF_INET: 2975 if (pr->pr_flags & PR_IP4) 2976 { 2977 mtx_lock(&pr->pr_mtx); 2978 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 2979 error = EAFNOSUPPORT; 2980 mtx_unlock(&pr->pr_mtx); 2981 } 2982 break; 2983 #endif 2984 #ifdef INET6 2985 case AF_INET6: 2986 if (pr->pr_flags & PR_IP6) 2987 { 2988 mtx_lock(&pr->pr_mtx); 2989 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 2990 error = EAFNOSUPPORT; 2991 mtx_unlock(&pr->pr_mtx); 2992 } 2993 break; 2994 #endif 2995 case AF_LOCAL: 2996 case AF_ROUTE: 2997 break; 2998 default: 2999 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3000 error = EAFNOSUPPORT; 3001 } 3002 return (error); 3003 } 3004 3005 /* 3006 * Check if given address belongs to the jail referenced by cred (wrapper to 3007 * prison_check_ip[46]). 3008 * 3009 * Returns 0 if jail doesn't restrict the address family or if address belongs 3010 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3011 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3012 */ 3013 int 3014 prison_if(struct ucred *cred, const struct sockaddr *sa) 3015 { 3016 #ifdef INET 3017 const struct sockaddr_in *sai; 3018 #endif 3019 #ifdef INET6 3020 const struct sockaddr_in6 *sai6; 3021 #endif 3022 int error; 3023 3024 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3025 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3026 3027 #ifdef VIMAGE 3028 if (prison_owns_vnet(cred)) 3029 return (0); 3030 #endif 3031 3032 error = 0; 3033 switch (sa->sa_family) 3034 { 3035 #ifdef INET 3036 case AF_INET: 3037 sai = (const struct sockaddr_in *)sa; 3038 error = prison_check_ip4(cred, &sai->sin_addr); 3039 break; 3040 #endif 3041 #ifdef INET6 3042 case AF_INET6: 3043 sai6 = (const struct sockaddr_in6 *)sa; 3044 error = prison_check_ip6(cred, &sai6->sin6_addr); 3045 break; 3046 #endif 3047 default: 3048 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3049 error = EAFNOSUPPORT; 3050 } 3051 return (error); 3052 } 3053 3054 /* 3055 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3056 */ 3057 int 3058 prison_check(struct ucred *cred1, struct ucred *cred2) 3059 { 3060 3061 return ((cred1->cr_prison == cred2->cr_prison || 3062 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3063 } 3064 3065 /* 3066 * Return 1 if p2 is a child of p1, otherwise 0. 3067 */ 3068 int 3069 prison_ischild(struct prison *pr1, struct prison *pr2) 3070 { 3071 3072 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3073 if (pr1 == pr2) 3074 return (1); 3075 return (0); 3076 } 3077 3078 /* 3079 * Return true if the prison is currently alive. A prison is alive if it 3080 * holds user references and it isn't being removed. 3081 */ 3082 bool 3083 prison_isalive(struct prison *pr) 3084 { 3085 3086 if (__predict_false(pr->pr_state != PRISON_STATE_ALIVE)) 3087 return (false); 3088 return (true); 3089 } 3090 3091 /* 3092 * Return true if the prison is currently valid. A prison is valid if it has 3093 * been fully created, and is not being destroyed. Note that dying prisons 3094 * are still considered valid. Invalid prisons won't be found under normal 3095 * circumstances, as they're only put in that state by functions that have 3096 * an exclusive hold on allprison_lock. 3097 */ 3098 bool 3099 prison_isvalid(struct prison *pr) 3100 { 3101 3102 if (__predict_false(pr->pr_state == PRISON_STATE_INVALID)) 3103 return (false); 3104 if (__predict_false(refcount_load(&pr->pr_ref) == 0)) 3105 return (false); 3106 return (true); 3107 } 3108 3109 /* 3110 * Return 1 if the passed credential is in a jail and that jail does not 3111 * have its own virtual network stack, otherwise 0. 3112 */ 3113 int 3114 jailed_without_vnet(struct ucred *cred) 3115 { 3116 3117 if (!jailed(cred)) 3118 return (0); 3119 #ifdef VIMAGE 3120 if (prison_owns_vnet(cred)) 3121 return (0); 3122 #endif 3123 3124 return (1); 3125 } 3126 3127 /* 3128 * Return the correct hostname (domainname, et al) for the passed credential. 3129 */ 3130 void 3131 getcredhostname(struct ucred *cred, char *buf, size_t size) 3132 { 3133 struct prison *pr; 3134 3135 /* 3136 * A NULL credential can be used to shortcut to the physical 3137 * system's hostname. 3138 */ 3139 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3140 mtx_lock(&pr->pr_mtx); 3141 strlcpy(buf, pr->pr_hostname, size); 3142 mtx_unlock(&pr->pr_mtx); 3143 } 3144 3145 void 3146 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3147 { 3148 3149 mtx_lock(&cred->cr_prison->pr_mtx); 3150 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3151 mtx_unlock(&cred->cr_prison->pr_mtx); 3152 } 3153 3154 void 3155 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3156 { 3157 3158 mtx_lock(&cred->cr_prison->pr_mtx); 3159 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3160 mtx_unlock(&cred->cr_prison->pr_mtx); 3161 } 3162 3163 void 3164 getcredhostid(struct ucred *cred, unsigned long *hostid) 3165 { 3166 3167 mtx_lock(&cred->cr_prison->pr_mtx); 3168 *hostid = cred->cr_prison->pr_hostid; 3169 mtx_unlock(&cred->cr_prison->pr_mtx); 3170 } 3171 3172 void 3173 getjailname(struct ucred *cred, char *name, size_t len) 3174 { 3175 3176 mtx_lock(&cred->cr_prison->pr_mtx); 3177 strlcpy(name, cred->cr_prison->pr_name, len); 3178 mtx_unlock(&cred->cr_prison->pr_mtx); 3179 } 3180 3181 #ifdef VIMAGE 3182 /* 3183 * Determine whether the prison represented by cred owns 3184 * its vnet rather than having it inherited. 3185 * 3186 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3187 */ 3188 int 3189 prison_owns_vnet(struct ucred *cred) 3190 { 3191 3192 /* 3193 * vnets cannot be added/removed after jail creation, 3194 * so no need to lock here. 3195 */ 3196 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3197 } 3198 #endif 3199 3200 /* 3201 * Determine whether the subject represented by cred can "see" 3202 * status of a mount point. 3203 * Returns: 0 for permitted, ENOENT otherwise. 3204 * XXX: This function should be called cr_canseemount() and should be 3205 * placed in kern_prot.c. 3206 */ 3207 int 3208 prison_canseemount(struct ucred *cred, struct mount *mp) 3209 { 3210 struct prison *pr; 3211 struct statfs *sp; 3212 size_t len; 3213 3214 pr = cred->cr_prison; 3215 if (pr->pr_enforce_statfs == 0) 3216 return (0); 3217 if (pr->pr_root->v_mount == mp) 3218 return (0); 3219 if (pr->pr_enforce_statfs == 2) 3220 return (ENOENT); 3221 /* 3222 * If jail's chroot directory is set to "/" we should be able to see 3223 * all mount-points from inside a jail. 3224 * This is ugly check, but this is the only situation when jail's 3225 * directory ends with '/'. 3226 */ 3227 if (strcmp(pr->pr_path, "/") == 0) 3228 return (0); 3229 len = strlen(pr->pr_path); 3230 sp = &mp->mnt_stat; 3231 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3232 return (ENOENT); 3233 /* 3234 * Be sure that we don't have situation where jail's root directory 3235 * is "/some/path" and mount point is "/some/pathpath". 3236 */ 3237 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3238 return (ENOENT); 3239 return (0); 3240 } 3241 3242 void 3243 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3244 { 3245 char jpath[MAXPATHLEN]; 3246 struct prison *pr; 3247 size_t len; 3248 3249 pr = cred->cr_prison; 3250 if (pr->pr_enforce_statfs == 0) 3251 return; 3252 if (prison_canseemount(cred, mp) != 0) { 3253 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3254 strlcpy(sp->f_mntonname, "[restricted]", 3255 sizeof(sp->f_mntonname)); 3256 return; 3257 } 3258 if (pr->pr_root->v_mount == mp) { 3259 /* 3260 * Clear current buffer data, so we are sure nothing from 3261 * the valid path left there. 3262 */ 3263 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3264 *sp->f_mntonname = '/'; 3265 return; 3266 } 3267 /* 3268 * If jail's chroot directory is set to "/" we should be able to see 3269 * all mount-points from inside a jail. 3270 */ 3271 if (strcmp(pr->pr_path, "/") == 0) 3272 return; 3273 len = strlen(pr->pr_path); 3274 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3275 /* 3276 * Clear current buffer data, so we are sure nothing from 3277 * the valid path left there. 3278 */ 3279 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3280 if (*jpath == '\0') { 3281 /* Should never happen. */ 3282 *sp->f_mntonname = '/'; 3283 } else { 3284 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3285 } 3286 } 3287 3288 /* 3289 * Check with permission for a specific privilege is granted within jail. We 3290 * have a specific list of accepted privileges; the rest are denied. 3291 */ 3292 int 3293 prison_priv_check(struct ucred *cred, int priv) 3294 { 3295 struct prison *pr; 3296 int error; 3297 3298 /* 3299 * Some policies have custom handlers. This routine should not be 3300 * called for them. See priv_check_cred(). 3301 */ 3302 switch (priv) { 3303 case PRIV_VFS_LOOKUP: 3304 case PRIV_VFS_GENERATION: 3305 KASSERT(0, ("prison_priv_check instead of a custom handler " 3306 "called for %d\n", priv)); 3307 } 3308 3309 if (!jailed(cred)) 3310 return (0); 3311 3312 #ifdef VIMAGE 3313 /* 3314 * Privileges specific to prisons with a virtual network stack. 3315 * There might be a duplicate entry here in case the privilege 3316 * is only granted conditionally in the legacy jail case. 3317 */ 3318 switch (priv) { 3319 #ifdef notyet 3320 /* 3321 * NFS-specific privileges. 3322 */ 3323 case PRIV_NFS_DAEMON: 3324 case PRIV_NFS_LOCKD: 3325 #endif 3326 /* 3327 * Network stack privileges. 3328 */ 3329 case PRIV_NET_BRIDGE: 3330 case PRIV_NET_GRE: 3331 case PRIV_NET_BPF: 3332 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3333 case PRIV_NET_ROUTE: 3334 case PRIV_NET_TAP: 3335 case PRIV_NET_SETIFMTU: 3336 case PRIV_NET_SETIFFLAGS: 3337 case PRIV_NET_SETIFCAP: 3338 case PRIV_NET_SETIFDESCR: 3339 case PRIV_NET_SETIFNAME : 3340 case PRIV_NET_SETIFMETRIC: 3341 case PRIV_NET_SETIFPHYS: 3342 case PRIV_NET_SETIFMAC: 3343 case PRIV_NET_SETLANPCP: 3344 case PRIV_NET_ADDMULTI: 3345 case PRIV_NET_DELMULTI: 3346 case PRIV_NET_HWIOCTL: 3347 case PRIV_NET_SETLLADDR: 3348 case PRIV_NET_ADDIFGROUP: 3349 case PRIV_NET_DELIFGROUP: 3350 case PRIV_NET_IFCREATE: 3351 case PRIV_NET_IFDESTROY: 3352 case PRIV_NET_ADDIFADDR: 3353 case PRIV_NET_DELIFADDR: 3354 case PRIV_NET_LAGG: 3355 case PRIV_NET_GIF: 3356 case PRIV_NET_SETIFVNET: 3357 case PRIV_NET_SETIFFIB: 3358 3359 /* 3360 * 802.11-related privileges. 3361 */ 3362 case PRIV_NET80211_VAP_GETKEY: 3363 case PRIV_NET80211_VAP_MANAGE: 3364 3365 #ifdef notyet 3366 /* 3367 * ATM privileges. 3368 */ 3369 case PRIV_NETATM_CFG: 3370 case PRIV_NETATM_ADD: 3371 case PRIV_NETATM_DEL: 3372 case PRIV_NETATM_SET: 3373 3374 /* 3375 * Bluetooth privileges. 3376 */ 3377 case PRIV_NETBLUETOOTH_RAW: 3378 #endif 3379 3380 /* 3381 * Netgraph and netgraph module privileges. 3382 */ 3383 case PRIV_NETGRAPH_CONTROL: 3384 #ifdef notyet 3385 case PRIV_NETGRAPH_TTY: 3386 #endif 3387 3388 /* 3389 * IPv4 and IPv6 privileges. 3390 */ 3391 case PRIV_NETINET_IPFW: 3392 case PRIV_NETINET_DIVERT: 3393 case PRIV_NETINET_PF: 3394 case PRIV_NETINET_DUMMYNET: 3395 case PRIV_NETINET_CARP: 3396 case PRIV_NETINET_MROUTE: 3397 case PRIV_NETINET_RAW: 3398 case PRIV_NETINET_ADDRCTRL6: 3399 case PRIV_NETINET_ND6: 3400 case PRIV_NETINET_SCOPE6: 3401 case PRIV_NETINET_ALIFETIME6: 3402 case PRIV_NETINET_IPSEC: 3403 case PRIV_NETINET_BINDANY: 3404 3405 #ifdef notyet 3406 /* 3407 * NCP privileges. 3408 */ 3409 case PRIV_NETNCP: 3410 3411 /* 3412 * SMB privileges. 3413 */ 3414 case PRIV_NETSMB: 3415 #endif 3416 3417 /* 3418 * No default: or deny here. 3419 * In case of no permit fall through to next switch(). 3420 */ 3421 if (cred->cr_prison->pr_flags & PR_VNET) 3422 return (0); 3423 } 3424 #endif /* VIMAGE */ 3425 3426 switch (priv) { 3427 /* 3428 * Allow ktrace privileges for root in jail. 3429 */ 3430 case PRIV_KTRACE: 3431 3432 #if 0 3433 /* 3434 * Allow jailed processes to configure audit identity and 3435 * submit audit records (login, etc). In the future we may 3436 * want to further refine the relationship between audit and 3437 * jail. 3438 */ 3439 case PRIV_AUDIT_GETAUDIT: 3440 case PRIV_AUDIT_SETAUDIT: 3441 case PRIV_AUDIT_SUBMIT: 3442 #endif 3443 3444 /* 3445 * Allow jailed processes to manipulate process UNIX 3446 * credentials in any way they see fit. 3447 */ 3448 case PRIV_CRED_SETUID: 3449 case PRIV_CRED_SETEUID: 3450 case PRIV_CRED_SETGID: 3451 case PRIV_CRED_SETEGID: 3452 case PRIV_CRED_SETGROUPS: 3453 case PRIV_CRED_SETREUID: 3454 case PRIV_CRED_SETREGID: 3455 case PRIV_CRED_SETRESUID: 3456 case PRIV_CRED_SETRESGID: 3457 3458 /* 3459 * Jail implements visibility constraints already, so allow 3460 * jailed root to override uid/gid-based constraints. 3461 */ 3462 case PRIV_SEEOTHERGIDS: 3463 case PRIV_SEEOTHERUIDS: 3464 3465 /* 3466 * Jail implements inter-process debugging limits already, so 3467 * allow jailed root various debugging privileges. 3468 */ 3469 case PRIV_DEBUG_DIFFCRED: 3470 case PRIV_DEBUG_SUGID: 3471 case PRIV_DEBUG_UNPRIV: 3472 3473 /* 3474 * Allow jail to set various resource limits and login 3475 * properties, and for now, exceed process resource limits. 3476 */ 3477 case PRIV_PROC_LIMIT: 3478 case PRIV_PROC_SETLOGIN: 3479 case PRIV_PROC_SETRLIMIT: 3480 3481 /* 3482 * System V and POSIX IPC privileges are granted in jail. 3483 */ 3484 case PRIV_IPC_READ: 3485 case PRIV_IPC_WRITE: 3486 case PRIV_IPC_ADMIN: 3487 case PRIV_IPC_MSGSIZE: 3488 case PRIV_MQ_ADMIN: 3489 3490 /* 3491 * Jail operations within a jail work on child jails. 3492 */ 3493 case PRIV_JAIL_ATTACH: 3494 case PRIV_JAIL_SET: 3495 case PRIV_JAIL_REMOVE: 3496 3497 /* 3498 * Jail implements its own inter-process limits, so allow 3499 * root processes in jail to change scheduling on other 3500 * processes in the same jail. Likewise for signalling. 3501 */ 3502 case PRIV_SCHED_DIFFCRED: 3503 case PRIV_SCHED_CPUSET: 3504 case PRIV_SIGNAL_DIFFCRED: 3505 case PRIV_SIGNAL_SUGID: 3506 3507 /* 3508 * Allow jailed processes to write to sysctls marked as jail 3509 * writable. 3510 */ 3511 case PRIV_SYSCTL_WRITEJAIL: 3512 3513 /* 3514 * Allow root in jail to manage a variety of quota 3515 * properties. These should likely be conditional on a 3516 * configuration option. 3517 */ 3518 case PRIV_VFS_GETQUOTA: 3519 case PRIV_VFS_SETQUOTA: 3520 3521 /* 3522 * Since Jail relies on chroot() to implement file system 3523 * protections, grant many VFS privileges to root in jail. 3524 * Be careful to exclude mount-related and NFS-related 3525 * privileges. 3526 */ 3527 case PRIV_VFS_READ: 3528 case PRIV_VFS_WRITE: 3529 case PRIV_VFS_ADMIN: 3530 case PRIV_VFS_EXEC: 3531 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3532 case PRIV_VFS_CHFLAGS_DEV: 3533 case PRIV_VFS_CHOWN: 3534 case PRIV_VFS_CHROOT: 3535 case PRIV_VFS_RETAINSUGID: 3536 case PRIV_VFS_FCHROOT: 3537 case PRIV_VFS_LINK: 3538 case PRIV_VFS_SETGID: 3539 case PRIV_VFS_STAT: 3540 case PRIV_VFS_STICKYFILE: 3541 3542 /* 3543 * As in the non-jail case, non-root users are expected to be 3544 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3545 * exists in the jail and they have permission to access it). 3546 */ 3547 case PRIV_KMEM_READ: 3548 return (0); 3549 3550 /* 3551 * Depending on the global setting, allow privilege of 3552 * setting system flags. 3553 */ 3554 case PRIV_VFS_SYSFLAGS: 3555 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3556 return (0); 3557 else 3558 return (EPERM); 3559 3560 /* 3561 * Depending on the global setting, allow privilege of 3562 * mounting/unmounting file systems. 3563 */ 3564 case PRIV_VFS_MOUNT: 3565 case PRIV_VFS_UNMOUNT: 3566 case PRIV_VFS_MOUNT_NONUSER: 3567 case PRIV_VFS_MOUNT_OWNER: 3568 pr = cred->cr_prison; 3569 prison_lock(pr); 3570 if (pr->pr_allow & PR_ALLOW_MOUNT && pr->pr_enforce_statfs < 2) 3571 error = 0; 3572 else 3573 error = EPERM; 3574 prison_unlock(pr); 3575 return (error); 3576 3577 /* 3578 * Jails should hold no disposition on the PRIV_VFS_READ_DIR 3579 * policy. priv_check_cred will not specifically allow it, and 3580 * we may want a MAC policy to allow it. 3581 */ 3582 case PRIV_VFS_READ_DIR: 3583 return (0); 3584 3585 /* 3586 * Conditionnaly allow locking (unlocking) physical pages 3587 * in memory. 3588 */ 3589 case PRIV_VM_MLOCK: 3590 case PRIV_VM_MUNLOCK: 3591 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK) 3592 return (0); 3593 else 3594 return (EPERM); 3595 3596 /* 3597 * Conditionally allow jailed root to bind reserved ports. 3598 */ 3599 case PRIV_NETINET_RESERVEDPORT: 3600 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS) 3601 return (0); 3602 else 3603 return (EPERM); 3604 3605 /* 3606 * Allow jailed root to reuse in-use ports. 3607 */ 3608 case PRIV_NETINET_REUSEPORT: 3609 return (0); 3610 3611 /* 3612 * Allow jailed root to set certain IPv4/6 (option) headers. 3613 */ 3614 case PRIV_NETINET_SETHDROPTS: 3615 return (0); 3616 3617 /* 3618 * Conditionally allow creating raw sockets in jail. 3619 */ 3620 case PRIV_NETINET_RAW: 3621 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3622 return (0); 3623 else 3624 return (EPERM); 3625 3626 /* 3627 * Since jail implements its own visibility limits on netstat 3628 * sysctls, allow getcred. This allows identd to work in 3629 * jail. 3630 */ 3631 case PRIV_NETINET_GETCRED: 3632 return (0); 3633 3634 /* 3635 * Allow jailed root to set loginclass. 3636 */ 3637 case PRIV_PROC_SETLOGINCLASS: 3638 return (0); 3639 3640 /* 3641 * Do not allow a process inside a jail to read the kernel 3642 * message buffer unless explicitly permitted. 3643 */ 3644 case PRIV_MSGBUF: 3645 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF) 3646 return (0); 3647 return (EPERM); 3648 3649 default: 3650 /* 3651 * In all remaining cases, deny the privilege request. This 3652 * includes almost all network privileges, many system 3653 * configuration privileges. 3654 */ 3655 return (EPERM); 3656 } 3657 } 3658 3659 /* 3660 * Return the part of pr2's name that is relative to pr1, or the whole name 3661 * if it does not directly follow. 3662 */ 3663 3664 char * 3665 prison_name(struct prison *pr1, struct prison *pr2) 3666 { 3667 char *name; 3668 3669 /* Jails see themselves as "0" (if they see themselves at all). */ 3670 if (pr1 == pr2) 3671 return "0"; 3672 name = pr2->pr_name; 3673 if (prison_ischild(pr1, pr2)) { 3674 /* 3675 * pr1 isn't locked (and allprison_lock may not be either) 3676 * so its length can't be counted on. But the number of dots 3677 * can be counted on - and counted. 3678 */ 3679 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3680 name = strchr(name, '.') + 1; 3681 } 3682 return (name); 3683 } 3684 3685 /* 3686 * Return the part of pr2's path that is relative to pr1, or the whole path 3687 * if it does not directly follow. 3688 */ 3689 static char * 3690 prison_path(struct prison *pr1, struct prison *pr2) 3691 { 3692 char *path1, *path2; 3693 int len1; 3694 3695 path1 = pr1->pr_path; 3696 path2 = pr2->pr_path; 3697 if (!strcmp(path1, "/")) 3698 return (path2); 3699 len1 = strlen(path1); 3700 if (strncmp(path1, path2, len1)) 3701 return (path2); 3702 if (path2[len1] == '\0') 3703 return "/"; 3704 if (path2[len1] == '/') 3705 return (path2 + len1); 3706 return (path2); 3707 } 3708 3709 /* 3710 * Jail-related sysctls. 3711 */ 3712 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 3713 "Jails"); 3714 3715 static int 3716 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 3717 { 3718 struct xprison *xp; 3719 struct prison *pr, *cpr; 3720 #ifdef INET 3721 struct in_addr *ip4 = NULL; 3722 int ip4s = 0; 3723 #endif 3724 #ifdef INET6 3725 struct in6_addr *ip6 = NULL; 3726 int ip6s = 0; 3727 #endif 3728 int descend, error; 3729 3730 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 3731 pr = req->td->td_ucred->cr_prison; 3732 error = 0; 3733 sx_slock(&allprison_lock); 3734 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 3735 #if defined(INET) || defined(INET6) 3736 again: 3737 #endif 3738 mtx_lock(&cpr->pr_mtx); 3739 #ifdef INET 3740 if (cpr->pr_ip4s > 0) { 3741 if (ip4s < cpr->pr_ip4s) { 3742 ip4s = cpr->pr_ip4s; 3743 mtx_unlock(&cpr->pr_mtx); 3744 ip4 = realloc(ip4, ip4s * 3745 sizeof(struct in_addr), M_TEMP, M_WAITOK); 3746 goto again; 3747 } 3748 bcopy(cpr->pr_ip4, ip4, 3749 cpr->pr_ip4s * sizeof(struct in_addr)); 3750 } 3751 #endif 3752 #ifdef INET6 3753 if (cpr->pr_ip6s > 0) { 3754 if (ip6s < cpr->pr_ip6s) { 3755 ip6s = cpr->pr_ip6s; 3756 mtx_unlock(&cpr->pr_mtx); 3757 ip6 = realloc(ip6, ip6s * 3758 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 3759 goto again; 3760 } 3761 bcopy(cpr->pr_ip6, ip6, 3762 cpr->pr_ip6s * sizeof(struct in6_addr)); 3763 } 3764 #endif 3765 bzero(xp, sizeof(*xp)); 3766 xp->pr_version = XPRISON_VERSION; 3767 xp->pr_id = cpr->pr_id; 3768 xp->pr_state = cpr->pr_state; 3769 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 3770 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 3771 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 3772 #ifdef INET 3773 xp->pr_ip4s = cpr->pr_ip4s; 3774 #endif 3775 #ifdef INET6 3776 xp->pr_ip6s = cpr->pr_ip6s; 3777 #endif 3778 mtx_unlock(&cpr->pr_mtx); 3779 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 3780 if (error) 3781 break; 3782 #ifdef INET 3783 if (xp->pr_ip4s > 0) { 3784 error = SYSCTL_OUT(req, ip4, 3785 xp->pr_ip4s * sizeof(struct in_addr)); 3786 if (error) 3787 break; 3788 } 3789 #endif 3790 #ifdef INET6 3791 if (xp->pr_ip6s > 0) { 3792 error = SYSCTL_OUT(req, ip6, 3793 xp->pr_ip6s * sizeof(struct in6_addr)); 3794 if (error) 3795 break; 3796 } 3797 #endif 3798 } 3799 sx_sunlock(&allprison_lock); 3800 free(xp, M_TEMP); 3801 #ifdef INET 3802 free(ip4, M_TEMP); 3803 #endif 3804 #ifdef INET6 3805 free(ip6, M_TEMP); 3806 #endif 3807 return (error); 3808 } 3809 3810 SYSCTL_OID(_security_jail, OID_AUTO, list, 3811 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3812 sysctl_jail_list, "S", "List of active jails"); 3813 3814 static int 3815 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 3816 { 3817 int error, injail; 3818 3819 injail = jailed(req->td->td_ucred); 3820 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 3821 3822 return (error); 3823 } 3824 3825 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 3826 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3827 sysctl_jail_jailed, "I", "Process in jail?"); 3828 3829 static int 3830 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 3831 { 3832 int error, havevnet; 3833 #ifdef VIMAGE 3834 struct ucred *cred = req->td->td_ucred; 3835 3836 havevnet = jailed(cred) && prison_owns_vnet(cred); 3837 #else 3838 havevnet = 0; 3839 #endif 3840 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 3841 3842 return (error); 3843 } 3844 3845 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 3846 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3847 sysctl_jail_vnet, "I", "Jail owns vnet?"); 3848 3849 #if defined(INET) || defined(INET6) 3850 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 3851 &jail_max_af_ips, 0, 3852 "Number of IP addresses a jail may have at most per address family (deprecated)"); 3853 #endif 3854 3855 /* 3856 * Default parameters for jail(2) compatibility. For historical reasons, 3857 * the sysctl names have varying similarity to the parameter names. Prisons 3858 * just see their own parameters, and can't change them. 3859 */ 3860 static int 3861 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 3862 { 3863 int error, i; 3864 3865 /* Get the current flag value, and convert it to a boolean. */ 3866 if (req->td->td_ucred->cr_prison == &prison0) { 3867 mtx_lock(&prison0.pr_mtx); 3868 i = (jail_default_allow & arg2) != 0; 3869 mtx_unlock(&prison0.pr_mtx); 3870 } else 3871 i = prison_allow(req->td->td_ucred, arg2); 3872 3873 if (arg1 != NULL) 3874 i = !i; 3875 error = sysctl_handle_int(oidp, &i, 0, req); 3876 if (error || !req->newptr) 3877 return (error); 3878 i = i ? arg2 : 0; 3879 if (arg1 != NULL) 3880 i ^= arg2; 3881 /* 3882 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 3883 * for writing. 3884 */ 3885 mtx_lock(&prison0.pr_mtx); 3886 jail_default_allow = (jail_default_allow & ~arg2) | i; 3887 mtx_unlock(&prison0.pr_mtx); 3888 return (0); 3889 } 3890 3891 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 3892 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3893 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 3894 "Processes in jail can set their hostnames (deprecated)"); 3895 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 3896 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3897 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 3898 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 3899 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 3900 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3901 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 3902 "Processes in jail can use System V IPC primitives (deprecated)"); 3903 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 3904 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3905 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 3906 "Prison root can create raw sockets (deprecated)"); 3907 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 3908 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3909 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 3910 "Processes in jail can alter system file flags (deprecated)"); 3911 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 3912 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3913 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 3914 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 3915 3916 static int 3917 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 3918 { 3919 struct prison *pr; 3920 int level, error; 3921 3922 pr = req->td->td_ucred->cr_prison; 3923 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 3924 error = sysctl_handle_int(oidp, &level, 0, req); 3925 if (error || !req->newptr) 3926 return (error); 3927 *(int *)arg1 = level; 3928 return (0); 3929 } 3930 3931 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 3932 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3933 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 3934 sysctl_jail_default_level, "I", 3935 "Processes in jail cannot see all mounted file systems (deprecated)"); 3936 3937 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 3938 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 3939 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 3940 sysctl_jail_default_level, "I", 3941 "Ruleset for the devfs filesystem in jail (deprecated)"); 3942 3943 /* 3944 * Nodes to describe jail parameters. Maximum length of string parameters 3945 * is returned in the string itself, and the other parameters exist merely 3946 * to make themselves and their types known. 3947 */ 3948 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 3949 "Jail parameters"); 3950 3951 int 3952 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 3953 { 3954 int i; 3955 long l; 3956 size_t s; 3957 char numbuf[12]; 3958 3959 switch (oidp->oid_kind & CTLTYPE) 3960 { 3961 case CTLTYPE_LONG: 3962 case CTLTYPE_ULONG: 3963 l = 0; 3964 #ifdef SCTL_MASK32 3965 if (!(req->flags & SCTL_MASK32)) 3966 #endif 3967 return (SYSCTL_OUT(req, &l, sizeof(l))); 3968 case CTLTYPE_INT: 3969 case CTLTYPE_UINT: 3970 i = 0; 3971 return (SYSCTL_OUT(req, &i, sizeof(i))); 3972 case CTLTYPE_STRING: 3973 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 3974 return 3975 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 3976 case CTLTYPE_STRUCT: 3977 s = (size_t)arg2; 3978 return (SYSCTL_OUT(req, &s, sizeof(s))); 3979 } 3980 return (0); 3981 } 3982 3983 /* 3984 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 3985 * jail creation time but cannot be changed in an existing jail. 3986 */ 3987 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 3988 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 3989 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 3990 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 3991 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 3992 "I", "Jail secure level"); 3993 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 3994 "Jail value for kern.osreldate and uname -K"); 3995 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 3996 "Jail value for kern.osrelease and uname -r"); 3997 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 3998 "I", "Jail cannot see all mounted file systems"); 3999 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4000 "I", "Ruleset for in-jail devfs mounts"); 4001 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4002 "B", "Jail persistence"); 4003 #ifdef VIMAGE 4004 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4005 "E,jailsys", "Virtual network stack"); 4006 #endif 4007 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4008 "B", "Jail is in the process of shutting down"); 4009 4010 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4011 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4012 "I", "Current number of child jails"); 4013 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4014 "I", "Maximum number of child jails"); 4015 4016 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4017 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4018 "Jail hostname"); 4019 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4020 "Jail NIS domainname"); 4021 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4022 "Jail host UUID"); 4023 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4024 "LU", "Jail host ID"); 4025 4026 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4027 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4028 4029 #ifdef INET 4030 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4031 "Jail IPv4 address virtualization"); 4032 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4033 "S,in_addr,a", "Jail IPv4 addresses"); 4034 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4035 "B", "Do (not) use IPv4 source address selection rather than the " 4036 "primary jail IPv4 address."); 4037 #endif 4038 #ifdef INET6 4039 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4040 "Jail IPv6 address virtualization"); 4041 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4042 "S,in6_addr,a", "Jail IPv6 addresses"); 4043 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4044 "B", "Do (not) use IPv6 source address selection rather than the " 4045 "primary jail IPv6 address."); 4046 #endif 4047 4048 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4049 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4050 "B", "Jail may set hostname"); 4051 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4052 "B", "Jail may use SYSV IPC"); 4053 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4054 "B", "Jail may create raw sockets"); 4055 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4056 "B", "Jail may alter system file flags"); 4057 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4058 "B", "Jail may set file quotas"); 4059 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4060 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4061 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW, 4062 "B", "Jail may lock (unlock) physical pages in memory"); 4063 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW, 4064 "B", "Jail may bind sockets to reserved ports"); 4065 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW, 4066 "B", "Jail may read the kernel message buffer"); 4067 SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW, 4068 "B", "Unprivileged processes may use process debugging facilities"); 4069 SYSCTL_JAIL_PARAM(_allow, suser, CTLTYPE_INT | CTLFLAG_RW, 4070 "B", "Processes in jail with uid 0 have privilege"); 4071 4072 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4073 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4074 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4075 4076 /* 4077 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return 4078 * its associated bit in the pr_allow bitmask, or zero if the parameter was 4079 * not created. 4080 */ 4081 unsigned 4082 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr, 4083 const char *descr) 4084 { 4085 struct bool_flags *bf; 4086 struct sysctl_oid *parent; 4087 char *allow_name, *allow_noname, *allowed; 4088 #ifndef NO_SYSCTL_DESCR 4089 char *descr_deprecated; 4090 #endif 4091 u_int allow_flag; 4092 4093 if (prefix 4094 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name) 4095 < 0 || 4096 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name) 4097 < 0 4098 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 || 4099 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) { 4100 free(allow_name, M_PRISON); 4101 return 0; 4102 } 4103 4104 /* 4105 * See if this parameter has already beed added, i.e. a module was 4106 * previously loaded/unloaded. 4107 */ 4108 mtx_lock(&prison0.pr_mtx); 4109 for (bf = pr_flag_allow; 4110 bf < pr_flag_allow + nitems(pr_flag_allow) && 4111 atomic_load_int(&bf->flag) != 0; 4112 bf++) { 4113 if (strcmp(bf->name, allow_name) == 0) { 4114 allow_flag = bf->flag; 4115 goto no_add; 4116 } 4117 } 4118 4119 /* 4120 * Find a free bit in pr_allow_all, failing if there are none 4121 * (which shouldn't happen as long as we keep track of how many 4122 * potential dynamic flags exist). 4123 */ 4124 for (allow_flag = 1;; allow_flag <<= 1) { 4125 if (allow_flag == 0) 4126 goto no_add; 4127 if ((pr_allow_all & allow_flag) == 0) 4128 break; 4129 } 4130 4131 /* Note the parameter in the next open slot in pr_flag_allow. */ 4132 for (bf = pr_flag_allow; ; bf++) { 4133 if (bf == pr_flag_allow + nitems(pr_flag_allow)) { 4134 /* This should never happen, but is not fatal. */ 4135 allow_flag = 0; 4136 goto no_add; 4137 } 4138 if (atomic_load_int(&bf->flag) == 0) 4139 break; 4140 } 4141 bf->name = allow_name; 4142 bf->noname = allow_noname; 4143 pr_allow_all |= allow_flag; 4144 /* 4145 * prison0 always has permission for the new parameter. 4146 * Other jails must have it granted to them. 4147 */ 4148 prison0.pr_allow |= allow_flag; 4149 /* The flag indicates a valid entry, so make sure it is set last. */ 4150 atomic_store_rel_int(&bf->flag, allow_flag); 4151 mtx_unlock(&prison0.pr_mtx); 4152 4153 /* 4154 * Create sysctls for the paramter, and the back-compat global 4155 * permission. 4156 */ 4157 parent = prefix 4158 ? SYSCTL_ADD_NODE(NULL, 4159 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow), 4160 OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr) 4161 : &sysctl___security_jail_param_allow; 4162 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO, 4163 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4164 NULL, 0, sysctl_jail_param, "B", descr); 4165 if ((prefix 4166 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name) 4167 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) { 4168 #ifndef NO_SYSCTL_DESCR 4169 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)", 4170 descr); 4171 #endif 4172 (void)SYSCTL_ADD_PROC(NULL, 4173 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed, 4174 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag, 4175 sysctl_jail_default_allow, "I", descr_deprecated); 4176 #ifndef NO_SYSCTL_DESCR 4177 free(descr_deprecated, M_TEMP); 4178 #endif 4179 free(allowed, M_TEMP); 4180 } 4181 return allow_flag; 4182 4183 no_add: 4184 mtx_unlock(&prison0.pr_mtx); 4185 free(allow_name, M_PRISON); 4186 free(allow_noname, M_PRISON); 4187 return allow_flag; 4188 } 4189 4190 /* 4191 * The VFS system will register jail-aware filesystems here. They each get 4192 * a parameter allow.mount.xxxfs and a flag to check when a jailed user 4193 * attempts to mount. 4194 */ 4195 void 4196 prison_add_vfs(struct vfsconf *vfsp) 4197 { 4198 #ifdef NO_SYSCTL_DESCR 4199 4200 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 4201 NULL, NULL); 4202 #else 4203 char *descr; 4204 4205 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system", 4206 vfsp->vfc_name); 4207 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 4208 NULL, descr); 4209 free(descr, M_TEMP); 4210 #endif 4211 } 4212 4213 #ifdef RACCT 4214 void 4215 prison_racct_foreach(void (*callback)(struct racct *racct, 4216 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 4217 void *arg2, void *arg3) 4218 { 4219 struct prison_racct *prr; 4220 4221 ASSERT_RACCT_ENABLED(); 4222 4223 sx_slock(&allprison_lock); 4224 if (pre != NULL) 4225 (pre)(); 4226 LIST_FOREACH(prr, &allprison_racct, prr_next) 4227 (callback)(prr->prr_racct, arg2, arg3); 4228 if (post != NULL) 4229 (post)(); 4230 sx_sunlock(&allprison_lock); 4231 } 4232 4233 static struct prison_racct * 4234 prison_racct_find_locked(const char *name) 4235 { 4236 struct prison_racct *prr; 4237 4238 ASSERT_RACCT_ENABLED(); 4239 sx_assert(&allprison_lock, SA_XLOCKED); 4240 4241 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4242 return (NULL); 4243 4244 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4245 if (strcmp(name, prr->prr_name) != 0) 4246 continue; 4247 4248 /* Found prison_racct with a matching name? */ 4249 prison_racct_hold(prr); 4250 return (prr); 4251 } 4252 4253 /* Add new prison_racct. */ 4254 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4255 racct_create(&prr->prr_racct); 4256 4257 strcpy(prr->prr_name, name); 4258 refcount_init(&prr->prr_refcount, 1); 4259 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4260 4261 return (prr); 4262 } 4263 4264 struct prison_racct * 4265 prison_racct_find(const char *name) 4266 { 4267 struct prison_racct *prr; 4268 4269 ASSERT_RACCT_ENABLED(); 4270 4271 sx_xlock(&allprison_lock); 4272 prr = prison_racct_find_locked(name); 4273 sx_xunlock(&allprison_lock); 4274 return (prr); 4275 } 4276 4277 void 4278 prison_racct_hold(struct prison_racct *prr) 4279 { 4280 4281 ASSERT_RACCT_ENABLED(); 4282 4283 refcount_acquire(&prr->prr_refcount); 4284 } 4285 4286 static void 4287 prison_racct_free_locked(struct prison_racct *prr) 4288 { 4289 4290 ASSERT_RACCT_ENABLED(); 4291 sx_assert(&allprison_lock, SA_XLOCKED); 4292 4293 if (refcount_release(&prr->prr_refcount)) { 4294 racct_destroy(&prr->prr_racct); 4295 LIST_REMOVE(prr, prr_next); 4296 free(prr, M_PRISON_RACCT); 4297 } 4298 } 4299 4300 void 4301 prison_racct_free(struct prison_racct *prr) 4302 { 4303 4304 ASSERT_RACCT_ENABLED(); 4305 sx_assert(&allprison_lock, SA_UNLOCKED); 4306 4307 if (refcount_release_if_not_last(&prr->prr_refcount)) 4308 return; 4309 4310 sx_xlock(&allprison_lock); 4311 prison_racct_free_locked(prr); 4312 sx_xunlock(&allprison_lock); 4313 } 4314 4315 static void 4316 prison_racct_attach(struct prison *pr) 4317 { 4318 struct prison_racct *prr; 4319 4320 ASSERT_RACCT_ENABLED(); 4321 sx_assert(&allprison_lock, SA_XLOCKED); 4322 4323 prr = prison_racct_find_locked(pr->pr_name); 4324 KASSERT(prr != NULL, ("cannot find prison_racct")); 4325 4326 pr->pr_prison_racct = prr; 4327 } 4328 4329 /* 4330 * Handle jail renaming. From the racct point of view, renaming means 4331 * moving from one prison_racct to another. 4332 */ 4333 static void 4334 prison_racct_modify(struct prison *pr) 4335 { 4336 #ifdef RCTL 4337 struct proc *p; 4338 struct ucred *cred; 4339 #endif 4340 struct prison_racct *oldprr; 4341 4342 ASSERT_RACCT_ENABLED(); 4343 4344 sx_slock(&allproc_lock); 4345 sx_xlock(&allprison_lock); 4346 4347 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4348 sx_xunlock(&allprison_lock); 4349 sx_sunlock(&allproc_lock); 4350 return; 4351 } 4352 4353 oldprr = pr->pr_prison_racct; 4354 pr->pr_prison_racct = NULL; 4355 4356 prison_racct_attach(pr); 4357 4358 /* 4359 * Move resource utilisation records. 4360 */ 4361 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4362 4363 #ifdef RCTL 4364 /* 4365 * Force rctl to reattach rules to processes. 4366 */ 4367 FOREACH_PROC_IN_SYSTEM(p) { 4368 PROC_LOCK(p); 4369 cred = crhold(p->p_ucred); 4370 PROC_UNLOCK(p); 4371 rctl_proc_ucred_changed(p, cred); 4372 crfree(cred); 4373 } 4374 #endif 4375 4376 sx_sunlock(&allproc_lock); 4377 prison_racct_free_locked(oldprr); 4378 sx_xunlock(&allprison_lock); 4379 } 4380 4381 static void 4382 prison_racct_detach(struct prison *pr) 4383 { 4384 4385 ASSERT_RACCT_ENABLED(); 4386 sx_assert(&allprison_lock, SA_UNLOCKED); 4387 4388 if (pr->pr_prison_racct == NULL) 4389 return; 4390 prison_racct_free(pr->pr_prison_racct); 4391 pr->pr_prison_racct = NULL; 4392 } 4393 #endif /* RACCT */ 4394 4395 #ifdef DDB 4396 4397 static void 4398 db_show_prison(struct prison *pr) 4399 { 4400 struct bool_flags *bf; 4401 struct jailsys_flags *jsf; 4402 #if defined(INET) || defined(INET6) 4403 int ii; 4404 #endif 4405 unsigned f; 4406 #ifdef INET 4407 char ip4buf[INET_ADDRSTRLEN]; 4408 #endif 4409 #ifdef INET6 4410 char ip6buf[INET6_ADDRSTRLEN]; 4411 #endif 4412 4413 db_printf("prison %p:\n", pr); 4414 db_printf(" jid = %d\n", pr->pr_id); 4415 db_printf(" name = %s\n", pr->pr_name); 4416 db_printf(" parent = %p\n", pr->pr_parent); 4417 db_printf(" ref = %d\n", pr->pr_ref); 4418 db_printf(" uref = %d\n", pr->pr_uref); 4419 db_printf(" state = %s\n", 4420 pr->pr_state == PRISON_STATE_ALIVE ? "alive" : 4421 pr->pr_state == PRISON_STATE_DYING ? "dying" : 4422 "invalid"); 4423 db_printf(" path = %s\n", pr->pr_path); 4424 db_printf(" cpuset = %d\n", pr->pr_cpuset 4425 ? pr->pr_cpuset->cs_id : -1); 4426 #ifdef VIMAGE 4427 db_printf(" vnet = %p\n", pr->pr_vnet); 4428 #endif 4429 db_printf(" root = %p\n", pr->pr_root); 4430 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4431 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4432 db_printf(" children.max = %d\n", pr->pr_childmax); 4433 db_printf(" children.cur = %d\n", pr->pr_childcount); 4434 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4435 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4436 db_printf(" flags = 0x%x", pr->pr_flags); 4437 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++) 4438 if (pr->pr_flags & bf->flag) 4439 db_printf(" %s", bf->name); 4440 for (jsf = pr_flag_jailsys; 4441 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 4442 jsf++) { 4443 f = pr->pr_flags & (jsf->disable | jsf->new); 4444 db_printf(" %-16s= %s\n", jsf->name, 4445 (f != 0 && f == jsf->disable) ? "disable" 4446 : (f == jsf->new) ? "new" 4447 : "inherit"); 4448 } 4449 db_printf(" allow = 0x%x", pr->pr_allow); 4450 for (bf = pr_flag_allow; 4451 bf < pr_flag_allow + nitems(pr_flag_allow) && 4452 atomic_load_int(&bf->flag) != 0; 4453 bf++) 4454 if (pr->pr_allow & bf->flag) 4455 db_printf(" %s", bf->name); 4456 db_printf("\n"); 4457 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4458 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4459 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4460 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4461 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4462 #ifdef INET 4463 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4464 for (ii = 0; ii < pr->pr_ip4s; ii++) 4465 db_printf(" %s %s\n", 4466 ii == 0 ? "ip4.addr =" : " ", 4467 inet_ntoa_r(pr->pr_ip4[ii], ip4buf)); 4468 #endif 4469 #ifdef INET6 4470 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4471 for (ii = 0; ii < pr->pr_ip6s; ii++) 4472 db_printf(" %s %s\n", 4473 ii == 0 ? "ip6.addr =" : " ", 4474 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4475 #endif 4476 } 4477 4478 DB_SHOW_COMMAND(prison, db_show_prison_command) 4479 { 4480 struct prison *pr; 4481 4482 if (!have_addr) { 4483 /* 4484 * Show all prisons in the list, and prison0 which is not 4485 * listed. 4486 */ 4487 db_show_prison(&prison0); 4488 if (!db_pager_quit) { 4489 TAILQ_FOREACH(pr, &allprison, pr_list) { 4490 db_show_prison(pr); 4491 if (db_pager_quit) 4492 break; 4493 } 4494 } 4495 return; 4496 } 4497 4498 if (addr == 0) 4499 pr = &prison0; 4500 else { 4501 /* Look for a prison with the ID and with references. */ 4502 TAILQ_FOREACH(pr, &allprison, pr_list) 4503 if (pr->pr_id == addr && pr->pr_ref > 0) 4504 break; 4505 if (pr == NULL) 4506 /* Look again, without requiring a reference. */ 4507 TAILQ_FOREACH(pr, &allprison, pr_list) 4508 if (pr->pr_id == addr) 4509 break; 4510 if (pr == NULL) 4511 /* Assume address points to a valid prison. */ 4512 pr = (struct prison *)addr; 4513 } 4514 db_show_prison(pr); 4515 } 4516 4517 #endif /* DDB */ 4518