1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1999 Poul-Henning Kamp. 5 * Copyright (c) 2008 Bjoern A. Zeeb. 6 * Copyright (c) 2009 James Gritton. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 #include "opt_ddb.h" 33 #include "opt_inet.h" 34 #include "opt_inet6.h" 35 #include "opt_nfs.h" 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/ctype.h> 40 #include <sys/kernel.h> 41 #include <sys/systm.h> 42 #include <sys/errno.h> 43 #include <sys/file.h> 44 #include <sys/sysproto.h> 45 #include <sys/malloc.h> 46 #include <sys/osd.h> 47 #include <sys/priv.h> 48 #include <sys/proc.h> 49 #include <sys/epoch.h> 50 #include <sys/event.h> 51 #include <sys/taskqueue.h> 52 #include <sys/fcntl.h> 53 #include <sys/jail.h> 54 #include <sys/jaildesc.h> 55 #include <sys/linker.h> 56 #include <sys/lock.h> 57 #include <sys/mman.h> 58 #include <sys/mutex.h> 59 #include <sys/racct.h> 60 #include <sys/rctl.h> 61 #include <sys/refcount.h> 62 #include <sys/sx.h> 63 #include <sys/sysent.h> 64 #include <sys/namei.h> 65 #include <sys/mount.h> 66 #include <sys/queue.h> 67 #include <sys/socket.h> 68 #include <sys/syscallsubr.h> 69 #include <sys/sysctl.h> 70 #include <sys/uuid.h> 71 #include <sys/vnode.h> 72 73 #include <net/if.h> 74 #include <net/vnet.h> 75 76 #include <netinet/in.h> 77 78 #ifdef DDB 79 #include <ddb/ddb.h> 80 #endif /* DDB */ 81 82 #include <security/mac/mac_framework.h> 83 #include <security/mac/mac_policy.h> 84 #include <security/mac/mac_syscalls.h> 85 86 #define PRISON0_HOSTUUID_MODULE "hostuuid" 87 88 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 89 #ifdef RACCT 90 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 91 #endif 92 93 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 94 #ifdef INET 95 #ifdef INET6 96 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 97 #else 98 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 99 #endif 100 #else /* !INET */ 101 #ifdef INET6 102 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 103 #else 104 #define _PR_IP_SADDRSEL 0 105 #endif 106 #endif 107 108 /* prison0 describes what is "real" about the system. */ 109 struct prison prison0 = { 110 .pr_id = 0, 111 .pr_name = "0", 112 .pr_ref = 1, 113 .pr_uref = 1, 114 .pr_path = "/", 115 .pr_securelevel = -1, 116 .pr_devfs_rsnum = 0, 117 .pr_state = PRISON_STATE_ALIVE, 118 .pr_childmax = JAIL_MAX, 119 .pr_hostuuid = DEFAULT_HOSTUUID, 120 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 121 #ifdef VIMAGE 122 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 123 #else 124 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 125 #endif 126 .pr_allow = PR_ALLOW_PRISON0, 127 }; 128 _Static_assert((PR_ALLOW_PRISON0 & ~PR_ALLOW_ALL_STATIC) == 0, 129 "Bits enabled in PR_ALLOW_PRISON0 that are not statically reserved"); 130 131 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 132 133 struct bool_flags { 134 const char *name; 135 const char *noname; 136 volatile u_int flag; 137 }; 138 struct jailsys_flags { 139 const char *name; 140 unsigned disable; 141 unsigned new; 142 }; 143 144 /* 145 * Handle jail teardown in a dedicated thread to avoid deadlocks from 146 * vnet_destroy(). 147 */ 148 TASKQUEUE_DEFINE_THREAD(jail_remove); 149 150 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 151 struct sx allprison_lock; 152 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 153 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 154 LIST_HEAD(, prison_racct) allprison_racct; 155 int lastprid = 0; 156 int lastdeadid = 0; 157 158 static int get_next_prid(struct prison **insprp); 159 static int get_next_deadid(struct prison **insprp); 160 static int do_jail_attach(struct thread *td, struct prison *pr, int *drflagsp); 161 static int prison_attach_thread_single(struct thread *td); 162 static void prison_attach_thread_single_end(struct thread *td); 163 static void prison_complete(void *context, int pending); 164 static void prison_deref(struct prison *pr, int flags); 165 static void prison_deref_kill(struct prison *pr, struct prisonlist *freeprison); 166 static int prison_lock_xlock(struct prison *pr, int flags); 167 static void prison_cleanup_locked(struct prison *pr); 168 static void prison_cleanup_unlocked(struct prison *pr); 169 static void prison_free_not_last(struct prison *pr); 170 static void prison_proc_free_not_last(struct prison *pr); 171 static void prison_proc_relink(struct prison *opr, struct prison *npr, 172 struct proc *p); 173 static void prison_set_allow_locked(struct prison *pr, unsigned flag, 174 int enable); 175 static char *prison_path(struct prison *pr1, struct prison *pr2); 176 #ifdef RACCT 177 static void prison_racct_attach(struct prison *pr); 178 static void prison_racct_modify(struct prison *pr); 179 static void prison_racct_detach(struct prison *pr); 180 #endif 181 static void prison_knote(struct prison *pr, long hint); 182 183 /* Flags for prison_deref */ 184 #define PD_DEREF 0x01 /* Decrement pr_ref */ 185 #define PD_DEUREF 0x02 /* Decrement pr_uref */ 186 #define PD_KILL 0x04 /* Remove jail, kill processes, etc */ 187 #define PD_LOCKED 0x10 /* pr_mtx is held */ 188 #define PD_LIST_SLOCKED 0x20 /* allprison_lock is held shared */ 189 #define PD_LIST_XLOCKED 0x40 /* allprison_lock is held exclusive */ 190 #define PD_OP_FLAGS 0x07 /* Operation flags */ 191 #define PD_LOCK_FLAGS 0x70 /* Lock status flags */ 192 193 /* 194 * Parameter names corresponding to PR_* flag values. Size values are for kvm 195 * as we cannot figure out the size of a sparse array, or an array without a 196 * terminating entry. 197 */ 198 static struct bool_flags pr_flag_bool[] = { 199 {JAIL_PARAM_PERSIST, JAIL_PARAM_NOPERSIST, PR_PERSIST}, 200 #ifdef INET 201 {JAIL_PARAM_IP4_SADDRSEL, JAIL_PARAM_IP4_NOSADDRSEL, PR_IP4_SADDRSEL}, 202 #endif 203 #ifdef INET6 204 {JAIL_PARAM_IP6_SADDRSEL, JAIL_PARAM_IP6_NOSADDRSEL, PR_IP6_SADDRSEL}, 205 #endif 206 }; 207 const size_t pr_flag_bool_size = sizeof(pr_flag_bool); 208 209 static struct jailsys_flags pr_flag_jailsys[] = { 210 {JAIL_PARAM_HOST, 0, PR_HOST}, 211 #ifdef VIMAGE 212 {JAIL_PARAM_VNET, 0, PR_VNET}, 213 #endif 214 #ifdef INET 215 {JAIL_PARAM_IP4, PR_IP4_USER, PR_IP4_USER}, 216 #endif 217 #ifdef INET6 218 {JAIL_PARAM_IP6, PR_IP6_USER, PR_IP6_USER}, 219 #endif 220 }; 221 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 222 223 /* 224 * Make this array full-size so dynamic parameters can be added. 225 * It is protected by prison0.mtx, but lockless reading is allowed 226 * with an atomic check of the flag values. 227 */ 228 static struct bool_flags pr_flag_allow[NBBY * NBPW] = { 229 {JAIL_PARAM_ALLOW_SET_HOSTNAME, JAIL_PARAM_ALLOW_NOSET_HOSTNAME, 230 PR_ALLOW_SET_HOSTNAME}, 231 {JAIL_PARAM_ALLOW_SYSVIPC, JAIL_PARAM_ALLOW_NOSYSVIPC, 232 PR_ALLOW_SYSVIPC}, 233 {JAIL_PARAM_ALLOW_RAW_SOCKETS, JAIL_PARAM_ALLOW_NORAW_SOCKETS, 234 PR_ALLOW_RAW_SOCKETS}, 235 {JAIL_PARAM_ALLOW_CHFLAGS, JAIL_PARAM_ALLOW_NOCHFLAGS, 236 PR_ALLOW_CHFLAGS}, 237 {JAIL_PARAM_ALLOW_MOUNT, JAIL_PARAM_ALLOW_NOMOUNT, PR_ALLOW_MOUNT}, 238 {JAIL_PARAM_ALLOW_QUOTAS, JAIL_PARAM_ALLOW_NOQUOTAS, PR_ALLOW_QUOTAS}, 239 {JAIL_PARAM_ALLOW_SOCKET_AF, JAIL_PARAM_ALLOW_NOSOCKET_AF, 240 PR_ALLOW_SOCKET_AF}, 241 {JAIL_PARAM_ALLOW_MLOCK, JAIL_PARAM_ALLOW_NOMLOCK, PR_ALLOW_MLOCK}, 242 {JAIL_PARAM_ALLOW_RESERVED_PORTS, JAIL_PARAM_ALLOW_NORESERVED_PORTS, 243 PR_ALLOW_RESERVED_PORTS}, 244 {JAIL_PARAM_ALLOW_READ_MSGBUF, JAIL_PARAM_ALLOW_NOREAD_MSGBUF, 245 PR_ALLOW_READ_MSGBUF}, 246 {JAIL_PARAM_ALLOW_UNPRIV_DEBUG, JAIL_PARAM_ALLOW_NOUNPRIV_DEBUG, 247 PR_ALLOW_UNPRIV_DEBUG}, 248 {JAIL_PARAM_ALLOW_SUSER, JAIL_PARAM_ALLOW_NOSUSER, PR_ALLOW_SUSER}, 249 #ifdef VIMAGE 250 {JAIL_PARAM_ALLOW_NFSD, JAIL_PARAM_ALLOW_NONFSD, PR_ALLOW_NFSD}, 251 #endif 252 {JAIL_PARAM_ALLOW_EXTATTR, JAIL_PARAM_ALLOW_NOEXTATTR, 253 PR_ALLOW_EXTATTR}, 254 {JAIL_PARAM_ALLOW_ADJTIME, JAIL_PARAM_ALLOW_NOADJTIME, 255 PR_ALLOW_ADJTIME}, 256 {JAIL_PARAM_ALLOW_SETTIME, JAIL_PARAM_ALLOW_NOSETTIME, 257 PR_ALLOW_SETTIME}, 258 {JAIL_PARAM_ALLOW_ROUTING, JAIL_PARAM_ALLOW_NOROUTING, 259 PR_ALLOW_ROUTING}, 260 {JAIL_PARAM_ALLOW_UNPRIV_PARENT_TAMPER, 261 JAIL_PARAM_ALLOW_NOUNPRIV_PARENT_TAMPER, 262 PR_ALLOW_UNPRIV_PARENT_TAMPER}, 263 #ifdef AUDIT 264 {JAIL_PARAM_ALLOW_SETAUDIT, JAIL_PARAM_ALLOW_NOSETAUDIT, 265 PR_ALLOW_SETAUDIT}, 266 #endif 267 }; 268 static unsigned pr_allow_all = PR_ALLOW_ALL_STATIC; 269 const size_t pr_flag_allow_size = sizeof(pr_flag_allow); 270 271 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \ 272 PR_ALLOW_RESERVED_PORTS | \ 273 PR_ALLOW_UNPRIV_DEBUG | \ 274 PR_ALLOW_SUSER) 275 #define JAIL_DEFAULT_ENFORCE_STATFS 2 276 #define JAIL_DEFAULT_DEVFS_RSNUM 0 277 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 278 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 279 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 280 #if defined(INET) || defined(INET6) 281 static unsigned jail_max_af_ips = 255; 282 #endif 283 284 /* 285 * Initialize the parts of prison0 that can't be static-initialized with 286 * constants. This is called from proc0_init() after creating thread0 cpuset. 287 */ 288 void 289 prison0_init(void) 290 { 291 uint8_t *file, *data; 292 size_t size; 293 char buf[sizeof(prison0.pr_hostuuid)]; 294 #ifdef MAC 295 int error __diagused; 296 #endif 297 bool valid; 298 299 #ifdef MAC 300 error = mac_prison_init(&prison0, M_WAITOK); 301 MPASS(error == 0); 302 303 mtx_unlock(&prison0.pr_mtx); 304 #endif 305 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 306 prison0.pr_osreldate = osreldate; 307 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 308 309 /* If we have a preloaded hostuuid, use it. */ 310 file = preload_search_by_type(PRISON0_HOSTUUID_MODULE); 311 if (file != NULL) { 312 data = preload_fetch_addr(file); 313 size = preload_fetch_size(file); 314 if (data != NULL) { 315 /* 316 * The preloaded data may include trailing whitespace, almost 317 * certainly a newline; skip over any whitespace or 318 * non-printable characters to be safe. 319 */ 320 while (size > 0 && data[size - 1] <= 0x20) { 321 size--; 322 } 323 324 valid = false; 325 326 /* 327 * Not NUL-terminated when passed from loader, but 328 * validate_uuid requires that due to using sscanf (as 329 * does the subsequent strlcpy, since it still reads 330 * past the given size to return the true length); 331 * bounce to a temporary buffer to fix. 332 */ 333 if (size >= sizeof(buf)) 334 goto done; 335 336 memcpy(buf, data, size); 337 buf[size] = '\0'; 338 339 if (validate_uuid(buf, size, NULL, 0) != 0) 340 goto done; 341 342 valid = true; 343 (void)strlcpy(prison0.pr_hostuuid, buf, 344 sizeof(prison0.pr_hostuuid)); 345 346 done: 347 if (bootverbose && !valid) { 348 printf("hostuuid: preload data malformed: '%.*s'\n", 349 (int)size, data); 350 } 351 } 352 } 353 if (bootverbose) 354 printf("hostuuid: using %s\n", prison0.pr_hostuuid); 355 } 356 357 /* 358 * struct jail_args { 359 * struct jail *jail; 360 * }; 361 */ 362 int 363 sys_jail(struct thread *td, struct jail_args *uap) 364 { 365 uint32_t version; 366 int error; 367 struct jail j; 368 369 error = copyin(uap->jail, &version, sizeof(uint32_t)); 370 if (error) 371 return (error); 372 373 switch (version) { 374 case 0: 375 { 376 struct jail_v0 j0; 377 378 /* FreeBSD single IPv4 jails. */ 379 bzero(&j, sizeof(struct jail)); 380 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 381 if (error) 382 return (error); 383 j.version = j0.version; 384 j.path = j0.path; 385 j.hostname = j0.hostname; 386 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 387 break; 388 } 389 390 case 1: 391 /* 392 * Version 1 was used by multi-IPv4 jail implementations 393 * that never made it into the official kernel. 394 */ 395 return (EINVAL); 396 397 case 2: /* JAIL_API_VERSION */ 398 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 399 error = copyin(uap->jail, &j, sizeof(struct jail)); 400 if (error) 401 return (error); 402 break; 403 404 default: 405 /* Sci-Fi jails are not supported, sorry. */ 406 return (EINVAL); 407 } 408 return (kern_jail(td, &j)); 409 } 410 411 int 412 kern_jail(struct thread *td, struct jail *j) 413 { 414 struct iovec optiov[2 * (4 + nitems(pr_flag_allow) 415 #ifdef INET 416 + 1 417 #endif 418 #ifdef INET6 419 + 1 420 #endif 421 )]; 422 struct uio opt; 423 char *u_path, *u_hostname, *u_name; 424 struct bool_flags *bf; 425 #ifdef INET 426 uint32_t ip4s; 427 struct in_addr *u_ip4; 428 #endif 429 #ifdef INET6 430 struct in6_addr *u_ip6; 431 #endif 432 size_t tmplen; 433 int error, enforce_statfs; 434 435 bzero(&optiov, sizeof(optiov)); 436 opt.uio_iov = optiov; 437 opt.uio_iovcnt = 0; 438 opt.uio_offset = -1; 439 opt.uio_resid = -1; 440 opt.uio_segflg = UIO_SYSSPACE; 441 opt.uio_rw = UIO_READ; 442 opt.uio_td = td; 443 444 /* Set permissions for top-level jails from sysctls. */ 445 if (!jailed(td->td_ucred)) { 446 for (bf = pr_flag_allow; 447 bf < pr_flag_allow + nitems(pr_flag_allow) && 448 atomic_load_int(&bf->flag) != 0; 449 bf++) { 450 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *, 451 (jail_default_allow & bf->flag) 452 ? bf->name : bf->noname); 453 optiov[opt.uio_iovcnt].iov_len = 454 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 455 opt.uio_iovcnt += 2; 456 } 457 optiov[opt.uio_iovcnt].iov_base = JAIL_PARAM_ENFORCE_STATFS; 458 optiov[opt.uio_iovcnt].iov_len = sizeof(JAIL_PARAM_ENFORCE_STATFS); 459 opt.uio_iovcnt++; 460 enforce_statfs = jail_default_enforce_statfs; 461 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 462 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 463 opt.uio_iovcnt++; 464 } 465 466 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 467 #ifdef INET 468 ip4s = (j->version == 0) ? 1 : j->ip4s; 469 if (ip4s > jail_max_af_ips) 470 return (EINVAL); 471 tmplen += ip4s * sizeof(struct in_addr); 472 #else 473 if (j->ip4s > 0) 474 return (EINVAL); 475 #endif 476 #ifdef INET6 477 if (j->ip6s > jail_max_af_ips) 478 return (EINVAL); 479 tmplen += j->ip6s * sizeof(struct in6_addr); 480 #else 481 if (j->ip6s > 0) 482 return (EINVAL); 483 #endif 484 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 485 u_hostname = u_path + MAXPATHLEN; 486 u_name = u_hostname + MAXHOSTNAMELEN; 487 #ifdef INET 488 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 489 #endif 490 #ifdef INET6 491 #ifdef INET 492 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 493 #else 494 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 495 #endif 496 #endif 497 optiov[opt.uio_iovcnt].iov_base = JAIL_PARAM_PATH; 498 optiov[opt.uio_iovcnt].iov_len = sizeof(JAIL_PARAM_PATH); 499 opt.uio_iovcnt++; 500 optiov[opt.uio_iovcnt].iov_base = u_path; 501 error = copyinstr(j->path, u_path, MAXPATHLEN, 502 &optiov[opt.uio_iovcnt].iov_len); 503 if (error) { 504 free(u_path, M_TEMP); 505 return (error); 506 } 507 opt.uio_iovcnt++; 508 optiov[opt.uio_iovcnt].iov_base = JAIL_PARAM_HOST_HOSTNAME; 509 optiov[opt.uio_iovcnt].iov_len = sizeof(JAIL_PARAM_HOST_HOSTNAME); 510 opt.uio_iovcnt++; 511 optiov[opt.uio_iovcnt].iov_base = u_hostname; 512 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 513 &optiov[opt.uio_iovcnt].iov_len); 514 if (error) { 515 free(u_path, M_TEMP); 516 return (error); 517 } 518 opt.uio_iovcnt++; 519 if (j->jailname != NULL) { 520 optiov[opt.uio_iovcnt].iov_base = JAIL_PARAM_NAME; 521 optiov[opt.uio_iovcnt].iov_len = sizeof(JAIL_PARAM_NAME); 522 opt.uio_iovcnt++; 523 optiov[opt.uio_iovcnt].iov_base = u_name; 524 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 525 &optiov[opt.uio_iovcnt].iov_len); 526 if (error) { 527 free(u_path, M_TEMP); 528 return (error); 529 } 530 opt.uio_iovcnt++; 531 } 532 #ifdef INET 533 optiov[opt.uio_iovcnt].iov_base = JAIL_PARAM_IP4_ADDR; 534 optiov[opt.uio_iovcnt].iov_len = sizeof(JAIL_PARAM_IP4_ADDR); 535 opt.uio_iovcnt++; 536 optiov[opt.uio_iovcnt].iov_base = u_ip4; 537 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 538 if (j->version == 0) 539 u_ip4->s_addr = j->ip4s; 540 else { 541 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 542 if (error) { 543 free(u_path, M_TEMP); 544 return (error); 545 } 546 } 547 opt.uio_iovcnt++; 548 #endif 549 #ifdef INET6 550 optiov[opt.uio_iovcnt].iov_base = JAIL_PARAM_IP6_ADDR; 551 optiov[opt.uio_iovcnt].iov_len = sizeof(JAIL_PARAM_IP6_ADDR); 552 opt.uio_iovcnt++; 553 optiov[opt.uio_iovcnt].iov_base = u_ip6; 554 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 555 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 556 if (error) { 557 free(u_path, M_TEMP); 558 return (error); 559 } 560 opt.uio_iovcnt++; 561 #endif 562 KASSERT(opt.uio_iovcnt <= nitems(optiov), 563 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 564 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 565 free(u_path, M_TEMP); 566 return (error); 567 } 568 569 /* 570 * struct jail_set_args { 571 * struct iovec *iovp; 572 * unsigned int iovcnt; 573 * int flags; 574 * }; 575 */ 576 int 577 sys_jail_set(struct thread *td, struct jail_set_args *uap) 578 { 579 return (user_jail_set(td, uap->iovp, uap->iovcnt, uap->flags, 580 copyinuio)); 581 } 582 583 int 584 user_jail_set(struct thread *td, struct iovec *iovp, 585 unsigned int iovcnt, int flags, copyinuio_t *copyinuio_f) 586 { 587 struct uio *auio; 588 int error; 589 590 /* Check that we have an even number of iovecs. */ 591 if (iovcnt & 1) 592 return (EINVAL); 593 594 error = copyinuio_f(iovp, iovcnt, &auio); 595 if (error) 596 return (error); 597 error = kern_jail_set(td, auio, flags); 598 freeuio(auio); 599 return (error); 600 } 601 602 #if defined(INET) || defined(INET6) 603 typedef int prison_addr_cmp_t(const void *, const void *); 604 typedef bool prison_addr_valid_t(const void *); 605 static const struct pr_family { 606 size_t size; 607 prison_addr_cmp_t *cmp; 608 prison_addr_valid_t *valid; 609 int ip_flag; 610 } pr_families[PR_FAMILY_MAX] = { 611 #ifdef INET 612 [PR_INET] = { 613 .size = sizeof(struct in_addr), 614 .cmp = prison_qcmp_v4, 615 .valid = prison_valid_v4, 616 .ip_flag = PR_IP4_USER, 617 }, 618 #endif 619 #ifdef INET6 620 [PR_INET6] = { 621 .size = sizeof(struct in6_addr), 622 .cmp = prison_qcmp_v6, 623 .valid = prison_valid_v6, 624 .ip_flag = PR_IP6_USER, 625 }, 626 #endif 627 }; 628 629 /* 630 * Network address lists (pr_addrs) allocation for jails. The addresses 631 * are accessed locklessly by the network stack, thus need to be protected by 632 * the network epoch. 633 */ 634 struct prison_ip { 635 struct epoch_context ctx; 636 uint32_t ips; 637 #ifdef FUTURE_C 638 /* 639 * XXX Variable-length automatic arrays in union may be 640 * supported in future C. 641 */ 642 union { 643 char pr_ip[]; 644 struct in_addr pr_ip4[]; 645 struct in6_addr pr_ip6[]; 646 }; 647 #else /* No future C :( */ 648 char pr_ip[]; 649 #endif 650 }; 651 652 static char * 653 PR_IP(struct prison_ip *pip, const pr_family_t af, int idx) 654 { 655 MPASS(pip); 656 MPASS(af < PR_FAMILY_MAX); 657 MPASS(idx >= 0 && idx < pip->ips); 658 659 return (pip->pr_ip + pr_families[af].size * idx); 660 } 661 662 static struct prison_ip * 663 prison_ip_alloc(const pr_family_t af, uint32_t cnt, int flags) 664 { 665 struct prison_ip *pip; 666 667 pip = malloc(sizeof(struct prison_ip) + cnt * pr_families[af].size, 668 M_PRISON, flags); 669 if (pip != NULL) 670 pip->ips = cnt; 671 return (pip); 672 } 673 674 /* 675 * Allocate and copyin user supplied address list, sorting and validating. 676 * kern_jail_set() helper. 677 */ 678 static struct prison_ip * 679 prison_ip_copyin(const pr_family_t af, void *op, uint32_t cnt) 680 { 681 prison_addr_cmp_t *const cmp = pr_families[af].cmp; 682 const size_t size = pr_families[af].size; 683 struct prison_ip *pip; 684 685 pip = prison_ip_alloc(af, cnt, M_WAITOK); 686 bcopy(op, pip->pr_ip, cnt * size); 687 /* 688 * IP addresses are all sorted but ip[0] to preserve 689 * the primary IP address as given from userland. 690 * This special IP is used for unbound outgoing 691 * connections as well for "loopback" traffic in case 692 * source address selection cannot find any more fitting 693 * address to connect from. 694 */ 695 if (cnt > 1) 696 qsort(PR_IP(pip, af, 1), cnt - 1, size, cmp); 697 /* 698 * Check for duplicate addresses and do some simple 699 * zero and broadcast checks. If users give other bogus 700 * addresses it is their problem. 701 */ 702 for (int i = 0; i < cnt; i++) { 703 if (!pr_families[af].valid(PR_IP(pip, af, i))) { 704 free(pip, M_PRISON); 705 return (NULL); 706 } 707 if (i + 1 < cnt && 708 (cmp(PR_IP(pip, af, 0), PR_IP(pip, af, i + 1)) == 0 || 709 cmp(PR_IP(pip, af, i), PR_IP(pip, af, i + 1)) == 0)) { 710 free(pip, M_PRISON); 711 return (NULL); 712 } 713 } 714 715 return (pip); 716 } 717 718 /* 719 * Allocate and dup parent prison address list. 720 * kern_jail_set() helper. 721 */ 722 static void 723 prison_ip_dup(struct prison *ppr, struct prison *pr, const pr_family_t af) 724 { 725 const struct prison_ip *ppip = ppr->pr_addrs[af]; 726 struct prison_ip *pip; 727 728 if (ppip != NULL) { 729 pip = prison_ip_alloc(af, ppip->ips, M_WAITOK); 730 bcopy(ppip->pr_ip, pip->pr_ip, pip->ips * pr_families[af].size); 731 pr->pr_addrs[af] = pip; 732 } 733 } 734 735 /* 736 * Make sure the new set of IP addresses is a subset of the parent's list. 737 * Don't worry about the parent being unlocked, as any setting is done with 738 * allprison_lock held. 739 * kern_jail_set() helper. 740 */ 741 static bool 742 prison_ip_parent_match(struct prison_ip *ppip, struct prison_ip *pip, 743 const pr_family_t af) 744 { 745 prison_addr_cmp_t *const cmp = pr_families[af].cmp; 746 int i, j; 747 748 if (ppip == NULL) 749 return (false); 750 751 for (i = 0; i < ppip->ips; i++) 752 if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, i)) == 0) 753 break; 754 755 if (i == ppip->ips) 756 /* Main address not present in parent. */ 757 return (false); 758 759 if (pip->ips > 1) { 760 for (i = j = 1; i < pip->ips; i++) { 761 if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0) 762 /* Equals to parent primary address. */ 763 continue; 764 for (; j < ppip->ips; j++) 765 if (cmp(PR_IP(pip, af, i), 766 PR_IP(ppip, af, j)) == 0) 767 break; 768 if (j == ppip->ips) 769 break; 770 } 771 if (j == ppip->ips) 772 /* Address not present in parent. */ 773 return (false); 774 } 775 return (true); 776 } 777 778 /* 779 * Check for conflicting IP addresses. We permit them if there is no more 780 * than one IP on each jail. If there is a duplicate on a jail with more 781 * than one IP stop checking and return error. 782 * kern_jail_set() helper. 783 */ 784 static bool 785 prison_ip_conflict_check(const struct prison *ppr, const struct prison *pr, 786 struct prison_ip *pip, pr_family_t af) 787 { 788 const struct prison *tppr, *tpr; 789 int descend; 790 791 #ifdef VIMAGE 792 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 793 if (tppr->pr_flags & PR_VNET) 794 break; 795 #else 796 tppr = &prison0; 797 #endif 798 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 799 if (tpr == pr || 800 #ifdef VIMAGE 801 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 802 #endif 803 !prison_isalive(tpr)) { 804 descend = 0; 805 continue; 806 } 807 if (!(tpr->pr_flags & pr_families[af].ip_flag)) 808 continue; 809 descend = 0; 810 if (tpr->pr_addrs[af] == NULL || 811 (pip->ips == 1 && tpr->pr_addrs[af]->ips == 1)) 812 continue; 813 for (int i = 0; i < pip->ips; i++) 814 if (prison_ip_check(tpr, af, PR_IP(pip, af, i)) == 0) 815 return (false); 816 } 817 818 return (true); 819 } 820 821 _Static_assert(offsetof(struct prison_ip, ctx) == 0, 822 "prison must start with epoch context"); 823 static void 824 prison_ip_free_deferred(epoch_context_t ctx) 825 { 826 827 free(ctx, M_PRISON); 828 } 829 830 static void 831 prison_ip_free(struct prison_ip *pip) 832 { 833 834 if (pip != NULL) 835 NET_EPOCH_CALL(prison_ip_free_deferred, &pip->ctx); 836 } 837 838 static void 839 prison_ip_set(struct prison *pr, const pr_family_t af, struct prison_ip *new) 840 { 841 struct prison_ip **mem, *old; 842 843 mtx_assert(&pr->pr_mtx, MA_OWNED); 844 845 mem = &pr->pr_addrs[af]; 846 847 old = *mem; 848 atomic_store_ptr(mem, new); 849 prison_ip_free(old); 850 } 851 852 /* 853 * Restrict a prison's IP address list with its parent's, possibly replacing 854 * it. Return true if succeed, otherwise should redo. 855 * kern_jail_set() helper. 856 */ 857 static bool 858 prison_ip_restrict(struct prison *pr, const pr_family_t af, 859 struct prison_ip **newp) 860 { 861 struct prison_ip *ppip = pr->pr_parent->pr_addrs[af]; 862 struct prison_ip *pip = pr->pr_addrs[af]; 863 int (*const cmp)(const void *, const void *) = pr_families[af].cmp; 864 const size_t size = pr_families[af].size; 865 struct prison_ip *new = newp != NULL ? *newp : NULL; 866 uint32_t ips; 867 868 mtx_assert(&pr->pr_mtx, MA_OWNED); 869 870 /* 871 * Due to epoch-synchronized access to the IP address lists we always 872 * allocate a new list even if the old one has enough space. We could 873 * atomically update an IPv4 address inside a list, but that would 874 * screw up sorting, and in case of IPv6 we can't even atomically write 875 * one. 876 */ 877 if (ppip == NULL) { 878 if (pip != NULL) 879 prison_ip_set(pr, af, NULL); 880 return (true); 881 } 882 883 if (!(pr->pr_flags & pr_families[af].ip_flag)) { 884 if (new == NULL) { 885 new = prison_ip_alloc(af, ppip->ips, M_NOWAIT); 886 if (new == NULL) 887 return (false); /* Redo */ 888 } 889 /* This has no user settings, so just copy the parent's list. */ 890 MPASS(new->ips == ppip->ips); 891 bcopy(ppip->pr_ip, new->pr_ip, ppip->ips * size); 892 prison_ip_set(pr, af, new); 893 if (newp != NULL) 894 *newp = NULL; /* Used */ 895 } else if (pip != NULL) { 896 /* Remove addresses that aren't in the parent. */ 897 int i; 898 899 i = 0; /* index in pip */ 900 ips = 0; /* index in new */ 901 902 if (new == NULL) { 903 new = prison_ip_alloc(af, pip->ips, M_NOWAIT); 904 if (new == NULL) 905 return (false); /* Redo */ 906 } 907 908 for (int pi = 0; pi < ppip->ips; pi++) 909 if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, pi)) == 0) { 910 /* Found our primary address in parent. */ 911 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips), 912 size); 913 i++; 914 ips++; 915 break; 916 } 917 for (int pi = 1; i < pip->ips; ) { 918 /* Check against primary, which is unsorted. */ 919 if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0) { 920 /* Matches parent's primary address. */ 921 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips), 922 size); 923 i++; 924 ips++; 925 continue; 926 } 927 /* The rest are sorted. */ 928 switch (pi >= ppip->ips ? -1 : 929 cmp(PR_IP(pip, af, i), PR_IP(ppip, af, pi))) { 930 case -1: 931 i++; 932 break; 933 case 0: 934 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips), 935 size); 936 i++; 937 pi++; 938 ips++; 939 break; 940 case 1: 941 pi++; 942 break; 943 } 944 } 945 if (ips == 0) { 946 if (newp == NULL || *newp == NULL) 947 prison_ip_free(new); 948 new = NULL; 949 } else { 950 /* Shrink to real size */ 951 KASSERT((new->ips >= ips), 952 ("Out-of-bounds write to prison_ip %p", new)); 953 new->ips = ips; 954 } 955 prison_ip_set(pr, af, new); 956 if (newp != NULL) 957 *newp = NULL; /* Used */ 958 } 959 return (true); 960 } 961 962 /* 963 * Fast-path check if an address belongs to a prison. 964 */ 965 int 966 prison_ip_check(const struct prison *pr, const pr_family_t af, 967 const void *addr) 968 { 969 int (*const cmp)(const void *, const void *) = pr_families[af].cmp; 970 struct prison_ip *pip; 971 int i, a, z, d; 972 973 MPASS(mtx_owned(&pr->pr_mtx) || 974 in_epoch(net_epoch_preempt) || 975 sx_xlocked(&allprison_lock)); 976 977 pip = atomic_load_ptr(&pr->pr_addrs[af]); 978 if (__predict_false(pip == NULL)) 979 return (EAFNOSUPPORT); 980 981 /* Check the primary IP. */ 982 if (cmp(PR_IP(pip, af, 0), addr) == 0) 983 return (0); 984 985 /* 986 * All the other IPs are sorted so we can do a binary search. 987 */ 988 a = 0; 989 z = pip->ips - 2; 990 while (a <= z) { 991 i = (a + z) / 2; 992 d = cmp(PR_IP(pip, af, i + 1), addr); 993 if (d > 0) 994 z = i - 1; 995 else if (d < 0) 996 a = i + 1; 997 else 998 return (0); 999 } 1000 1001 return (EADDRNOTAVAIL); 1002 } 1003 1004 /* 1005 * Grab primary IP. Historically required mutex, but nothing prevents 1006 * us to support epoch-protected access. Is it used in fast path? 1007 * in{6}_jail.c helper 1008 */ 1009 const void * 1010 prison_ip_get0(const struct prison *pr, const pr_family_t af) 1011 { 1012 const struct prison_ip *pip = pr->pr_addrs[af]; 1013 1014 mtx_assert(&pr->pr_mtx, MA_OWNED); 1015 MPASS(pip); 1016 1017 return (pip->pr_ip); 1018 } 1019 1020 u_int 1021 prison_ip_cnt(const struct prison *pr, const pr_family_t af) 1022 { 1023 1024 return (pr->pr_addrs[af]->ips); 1025 } 1026 #endif /* defined(INET) || defined(INET6) */ 1027 1028 int 1029 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 1030 { 1031 struct file *jfp_out; 1032 struct nameidata nd; 1033 #ifdef INET 1034 struct prison_ip *ip4; 1035 #endif 1036 #ifdef INET6 1037 struct prison_ip *ip6; 1038 #endif 1039 struct vfsopt *opt; 1040 struct vfsoptlist *opts; 1041 struct prison *pr, *deadpr, *dinspr, *inspr, *mypr, *ppr, *tpr; 1042 struct ucred *jdcred; 1043 struct vnode *root; 1044 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 1045 char *g_path, *osrelstr; 1046 struct bool_flags *bf; 1047 struct jailsys_flags *jsf; 1048 #if defined(INET) || defined(INET6) 1049 void *op; 1050 #endif 1051 unsigned long hid; 1052 size_t namelen, onamelen, pnamelen; 1053 #ifdef MAC 1054 void *mac_set_prison_data = NULL; 1055 int gotmaclabel; 1056 #endif 1057 int created, cuflags, descend, drflags, enforce; 1058 int error, errmsg_len, errmsg_pos; 1059 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 1060 int deadid, jfd_in, jfd_out, jfd_pos, jid, jsys, len, level; 1061 int childmax, osreldt, rsnum, slevel; 1062 #ifdef INET 1063 int ip4s; 1064 bool redo_ip4; 1065 #endif 1066 #ifdef INET6 1067 int ip6s; 1068 bool redo_ip6; 1069 #endif 1070 bool maybe_changed; 1071 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 1072 uint64_t pr_allow_diff; 1073 unsigned tallow; 1074 char numbuf[12]; 1075 1076 mypr = td->td_ucred->cr_prison; 1077 if (((flags & (JAIL_CREATE | JAIL_AT_DESC)) == JAIL_CREATE) && 1078 mypr->pr_childmax == 0) 1079 return (EPERM); 1080 if (flags & ~JAIL_SET_MASK) 1081 return (EINVAL); 1082 if ((flags & (JAIL_USE_DESC | JAIL_AT_DESC)) == 1083 (JAIL_USE_DESC | JAIL_AT_DESC)) 1084 return (EINVAL); 1085 1086 /* Only let a single thread in the process try to attach at a time. */ 1087 if (flags & JAIL_ATTACH) { 1088 error = prison_attach_thread_single(td); 1089 if (error != 0) 1090 return (error); 1091 } 1092 1093 #ifdef INET 1094 ip4 = NULL; 1095 #endif 1096 #ifdef INET6 1097 ip6 = NULL; 1098 #endif 1099 g_path = NULL; 1100 jfp_out = NULL; 1101 jfd_out = -1; 1102 prison_hold(mypr); 1103 /* 1104 * Check all the parameters before committing to anything. Not all 1105 * errors can be caught early, but we may as well try. Also, this 1106 * takes care of some expensive stuff (path lookup) before getting 1107 * the allprison lock. 1108 * 1109 * XXX Jails are not filesystems, and jail parameters are not mount 1110 * options. But it makes more sense to re-use the vfsopt code 1111 * than duplicate it under a different name. 1112 */ 1113 error = vfs_buildopts(optuio, &opts); 1114 if (error) { 1115 opts = NULL; 1116 goto done_free; 1117 } 1118 1119 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 1120 if (!cuflags) { 1121 error = EINVAL; 1122 vfs_opterror(opts, "no valid operation (create or update)"); 1123 goto done_errmsg; 1124 } 1125 1126 error = vfs_copyopt(opts, JAIL_PARAM_DESC, &jfd_in, sizeof(jfd_in)); 1127 if (error == ENOENT) { 1128 if (flags & (JAIL_USE_DESC | JAIL_AT_DESC | JAIL_GET_DESC | 1129 JAIL_OWN_DESC)) { 1130 vfs_opterror(opts, "missing desc"); 1131 goto done_errmsg; 1132 } 1133 jfd_in = -1; 1134 } else if (error != 0) 1135 goto done_free; 1136 else { 1137 if (!(flags & (JAIL_USE_DESC | JAIL_AT_DESC | JAIL_GET_DESC | 1138 JAIL_OWN_DESC))) { 1139 error = EINVAL; 1140 vfs_opterror(opts, "unexpected desc"); 1141 goto done_errmsg; 1142 } 1143 if (flags & JAIL_AT_DESC) { 1144 /* 1145 * Look up and create jails based on the 1146 * descriptor's prison. 1147 */ 1148 struct prison *jdpr; 1149 1150 error = jaildesc_find(td, jfd_in, &jdpr, NULL); 1151 if (error != 0) { 1152 vfs_opterror(opts, error == ENOENT ? 1153 "descriptor to dead jail" : 1154 "not a jail descriptor"); 1155 goto done_errmsg; 1156 } 1157 prison_free(mypr); 1158 mypr = jdpr; 1159 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) { 1160 error = EPERM; 1161 goto done_free; 1162 } 1163 } 1164 if (flags & (JAIL_GET_DESC | JAIL_OWN_DESC)) { 1165 /* Allocate a jail descriptor to return later. */ 1166 error = jaildesc_alloc(td, &jfp_out, &jfd_out, 1167 flags & JAIL_OWN_DESC); 1168 if (error) 1169 goto done_free; 1170 } 1171 } 1172 1173 /* 1174 * Delay the permission check if using a jail descriptor, 1175 * until we get the descriptor's credentials. 1176 */ 1177 if (!(flags & JAIL_USE_DESC)) { 1178 error = priv_check(td, PRIV_JAIL_SET); 1179 if (error == 0 && (flags & JAIL_ATTACH)) 1180 error = priv_check(td, PRIV_JAIL_ATTACH); 1181 if (error) 1182 goto done_free; 1183 } 1184 1185 error = vfs_copyopt(opts, JAIL_PARAM_JID, &jid, sizeof(jid)); 1186 if (error == ENOENT) 1187 jid = 0; 1188 else if (error != 0) 1189 goto done_free; 1190 1191 error = vfs_copyopt(opts, JAIL_PARAM_SECURELEVEL, &slevel, sizeof(slevel)); 1192 if (error == ENOENT) 1193 gotslevel = 0; 1194 else if (error != 0) 1195 goto done_free; 1196 else 1197 gotslevel = 1; 1198 1199 error = 1200 vfs_copyopt(opts, JAIL_PARAM_CHILDREN_MAX, &childmax, sizeof(childmax)); 1201 if (error == ENOENT) 1202 gotchildmax = 0; 1203 else if (error != 0) 1204 goto done_free; 1205 else 1206 gotchildmax = 1; 1207 1208 error = vfs_copyopt(opts, JAIL_PARAM_ENFORCE_STATFS, &enforce, 1209 sizeof(enforce)); 1210 if (error == ENOENT) 1211 gotenforce = 0; 1212 else if (error != 0) 1213 goto done_free; 1214 else if (enforce < 0 || enforce > 2) { 1215 error = EINVAL; 1216 goto done_free; 1217 } else 1218 gotenforce = 1; 1219 1220 error = vfs_copyopt(opts, JAIL_PARAM_DEVFS_RULESET, &rsnum, sizeof(rsnum)); 1221 if (error == ENOENT) 1222 gotrsnum = 0; 1223 else if (error != 0) 1224 goto done_free; 1225 else 1226 gotrsnum = 1; 1227 1228 pr_flags = ch_flags = 0; 1229 for (bf = pr_flag_bool; 1230 bf < pr_flag_bool + nitems(pr_flag_bool); 1231 bf++) { 1232 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag); 1233 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag); 1234 } 1235 ch_flags |= pr_flags; 1236 for (jsf = pr_flag_jailsys; 1237 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 1238 jsf++) { 1239 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys)); 1240 if (error == ENOENT) 1241 continue; 1242 if (error != 0) 1243 goto done_free; 1244 switch (jsys) { 1245 case JAIL_SYS_DISABLE: 1246 if (!jsf->disable) { 1247 error = EINVAL; 1248 goto done_free; 1249 } 1250 pr_flags |= jsf->disable; 1251 break; 1252 case JAIL_SYS_NEW: 1253 pr_flags |= jsf->new; 1254 break; 1255 case JAIL_SYS_INHERIT: 1256 break; 1257 default: 1258 error = EINVAL; 1259 goto done_free; 1260 } 1261 ch_flags |= jsf->new | jsf->disable; 1262 } 1263 if ((flags & (JAIL_CREATE | JAIL_ATTACH)) == JAIL_CREATE 1264 && !(pr_flags & PR_PERSIST)) { 1265 error = EINVAL; 1266 vfs_opterror(opts, "new jail must persist or attach"); 1267 goto done_errmsg; 1268 } 1269 #ifdef VIMAGE 1270 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 1271 error = EINVAL; 1272 vfs_opterror(opts, "vnet cannot be changed after creation"); 1273 goto done_errmsg; 1274 } 1275 #endif 1276 #ifdef INET 1277 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 1278 error = EINVAL; 1279 vfs_opterror(opts, "ip4 cannot be changed after creation"); 1280 goto done_errmsg; 1281 } 1282 #endif 1283 #ifdef INET6 1284 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 1285 error = EINVAL; 1286 vfs_opterror(opts, "ip6 cannot be changed after creation"); 1287 goto done_errmsg; 1288 } 1289 #endif 1290 1291 pr_allow = ch_allow = 0; 1292 for (bf = pr_flag_allow; 1293 bf < pr_flag_allow + nitems(pr_flag_allow) && 1294 atomic_load_int(&bf->flag) != 0; 1295 bf++) { 1296 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag); 1297 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag); 1298 } 1299 ch_allow |= pr_allow; 1300 1301 error = vfs_getopt(opts, JAIL_PARAM_NAME, (void **)&name, &len); 1302 if (error == ENOENT) 1303 name = NULL; 1304 else if (error != 0) 1305 goto done_free; 1306 else { 1307 if (len == 0 || name[len - 1] != '\0') { 1308 error = EINVAL; 1309 goto done_free; 1310 } 1311 if (len > MAXHOSTNAMELEN) { 1312 error = ENAMETOOLONG; 1313 goto done_free; 1314 } 1315 } 1316 1317 error = vfs_getopt(opts, JAIL_PARAM_HOST_HOSTNAME, (void **)&host, &len); 1318 if (error == ENOENT) 1319 host = NULL; 1320 else if (error != 0) 1321 goto done_free; 1322 else { 1323 ch_flags |= PR_HOST; 1324 pr_flags |= PR_HOST; 1325 if (len == 0 || host[len - 1] != '\0') { 1326 error = EINVAL; 1327 goto done_free; 1328 } 1329 if (len > MAXHOSTNAMELEN) { 1330 error = ENAMETOOLONG; 1331 goto done_free; 1332 } 1333 } 1334 1335 error = vfs_getopt(opts, JAIL_PARAM_HOST_DOMAINNAME, (void **)&domain, &len); 1336 if (error == ENOENT) 1337 domain = NULL; 1338 else if (error != 0) 1339 goto done_free; 1340 else { 1341 ch_flags |= PR_HOST; 1342 pr_flags |= PR_HOST; 1343 if (len == 0 || domain[len - 1] != '\0') { 1344 error = EINVAL; 1345 goto done_free; 1346 } 1347 if (len > MAXHOSTNAMELEN) { 1348 error = ENAMETOOLONG; 1349 goto done_free; 1350 } 1351 } 1352 1353 error = vfs_getopt(opts, JAIL_PARAM_HOST_HOSTUUID, (void **)&uuid, &len); 1354 if (error == ENOENT) 1355 uuid = NULL; 1356 else if (error != 0) 1357 goto done_free; 1358 else { 1359 ch_flags |= PR_HOST; 1360 pr_flags |= PR_HOST; 1361 if (len == 0 || uuid[len - 1] != '\0') { 1362 error = EINVAL; 1363 goto done_free; 1364 } 1365 if (len > HOSTUUIDLEN) { 1366 error = ENAMETOOLONG; 1367 goto done_free; 1368 } 1369 } 1370 1371 #ifdef COMPAT_FREEBSD32 1372 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 1373 uint32_t hid32; 1374 1375 error = vfs_copyopt(opts, JAIL_PARAM_HOST_HOSTID, &hid32, sizeof(hid32)); 1376 hid = hid32; 1377 } else 1378 #endif 1379 error = vfs_copyopt(opts, JAIL_PARAM_HOST_HOSTID, &hid, sizeof(hid)); 1380 if (error == ENOENT) 1381 gothid = 0; 1382 else if (error != 0) 1383 goto done_free; 1384 else { 1385 gothid = 1; 1386 ch_flags |= PR_HOST; 1387 pr_flags |= PR_HOST; 1388 } 1389 1390 #ifdef MAC 1391 /* Process the mac.label vfsopt */ 1392 error = mac_set_prison_prepare(td, opts, &mac_set_prison_data); 1393 if (error == ENOENT) 1394 gotmaclabel = 0; 1395 else if (error != 0) 1396 goto done_errmsg; 1397 else 1398 gotmaclabel = 1; 1399 #endif 1400 1401 #ifdef INET 1402 error = vfs_getopt(opts, JAIL_PARAM_IP4_ADDR, &op, &ip4s); 1403 if (error == ENOENT) 1404 ip4s = 0; 1405 else if (error != 0) 1406 goto done_free; 1407 else if (ip4s & (sizeof(struct in_addr) - 1)) { 1408 error = EINVAL; 1409 goto done_free; 1410 } else { 1411 ch_flags |= PR_IP4_USER; 1412 pr_flags |= PR_IP4_USER; 1413 if (ip4s > 0) { 1414 ip4s /= sizeof(struct in_addr); 1415 if (ip4s > jail_max_af_ips) { 1416 error = EINVAL; 1417 vfs_opterror(opts, "too many IPv4 addresses"); 1418 goto done_errmsg; 1419 } 1420 ip4 = prison_ip_copyin(PR_INET, op, ip4s); 1421 if (ip4 == NULL) { 1422 error = EINVAL; 1423 goto done_free; 1424 } 1425 } 1426 } 1427 #endif 1428 1429 #ifdef INET6 1430 error = vfs_getopt(opts, JAIL_PARAM_IP6_ADDR, &op, &ip6s); 1431 if (error == ENOENT) 1432 ip6s = 0; 1433 else if (error != 0) 1434 goto done_free; 1435 else if (ip6s & (sizeof(struct in6_addr) - 1)) { 1436 error = EINVAL; 1437 goto done_free; 1438 } else { 1439 ch_flags |= PR_IP6_USER; 1440 pr_flags |= PR_IP6_USER; 1441 if (ip6s > 0) { 1442 ip6s /= sizeof(struct in6_addr); 1443 if (ip6s > jail_max_af_ips) { 1444 error = EINVAL; 1445 vfs_opterror(opts, "too many IPv6 addresses"); 1446 goto done_errmsg; 1447 } 1448 ip6 = prison_ip_copyin(PR_INET6, op, ip6s); 1449 if (ip6 == NULL) { 1450 error = EINVAL; 1451 goto done_free; 1452 } 1453 } 1454 } 1455 #endif 1456 1457 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1458 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1459 error = EINVAL; 1460 vfs_opterror(opts, 1461 "vnet jails cannot have IP address restrictions"); 1462 goto done_errmsg; 1463 } 1464 #endif 1465 1466 error = vfs_getopt(opts, JAIL_PARAM_OSRELEASE, (void **)&osrelstr, &len); 1467 if (error == ENOENT) 1468 osrelstr = NULL; 1469 else if (error != 0) 1470 goto done_free; 1471 else { 1472 if (flags & JAIL_UPDATE) { 1473 error = EINVAL; 1474 vfs_opterror(opts, 1475 "osrelease cannot be changed after creation"); 1476 goto done_errmsg; 1477 } 1478 if (len == 0 || osrelstr[len - 1] != '\0') { 1479 error = EINVAL; 1480 goto done_free; 1481 } 1482 if (len >= OSRELEASELEN) { 1483 error = ENAMETOOLONG; 1484 vfs_opterror(opts, 1485 "osrelease string must be 1-%d bytes long", 1486 OSRELEASELEN - 1); 1487 goto done_errmsg; 1488 } 1489 } 1490 1491 error = vfs_copyopt(opts, JAIL_PARAM_OSRELDATE, &osreldt, sizeof(osreldt)); 1492 if (error == ENOENT) 1493 osreldt = 0; 1494 else if (error != 0) 1495 goto done_free; 1496 else { 1497 if (flags & JAIL_UPDATE) { 1498 error = EINVAL; 1499 vfs_opterror(opts, 1500 "osreldate cannot be changed after creation"); 1501 goto done_errmsg; 1502 } 1503 if (osreldt == 0) { 1504 error = EINVAL; 1505 vfs_opterror(opts, "osreldate cannot be 0"); 1506 goto done_errmsg; 1507 } 1508 } 1509 1510 root = NULL; 1511 error = vfs_getopt(opts, JAIL_PARAM_PATH, (void **)&path, &len); 1512 if (error == ENOENT) 1513 path = NULL; 1514 else if (error != 0) 1515 goto done_free; 1516 else { 1517 if (flags & JAIL_UPDATE) { 1518 error = EINVAL; 1519 vfs_opterror(opts, 1520 "path cannot be changed after creation"); 1521 goto done_errmsg; 1522 } 1523 if (len == 0 || path[len - 1] != '\0') { 1524 error = EINVAL; 1525 goto done_free; 1526 } 1527 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path); 1528 error = namei(&nd); 1529 if (error) 1530 goto done_free; 1531 root = nd.ni_vp; 1532 NDFREE_PNBUF(&nd); 1533 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1534 strlcpy(g_path, path, MAXPATHLEN); 1535 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 1536 if (error == 0) { 1537 path = g_path; 1538 } else { 1539 /* exit on other errors */ 1540 goto done_free; 1541 } 1542 if (root->v_type != VDIR) { 1543 error = ENOTDIR; 1544 vput(root); 1545 goto done_free; 1546 } 1547 VOP_UNLOCK(root); 1548 } 1549 1550 /* 1551 * Find the specified jail, or at least its parent. 1552 * This abuses the file error codes ENOENT and EEXIST. 1553 */ 1554 pr = NULL; 1555 inspr = NULL; 1556 deadpr = NULL; 1557 maybe_changed = false; 1558 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 1559 namelc = strrchr(name, '.'); 1560 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 1561 if (*p != '\0') 1562 jid = 0; 1563 } 1564 sx_xlock(&allprison_lock); 1565 drflags = PD_LIST_XLOCKED; 1566 ppr = mypr; 1567 if (!prison_isalive(ppr)) { 1568 /* This jail is dying. This process will surely follow. */ 1569 error = EAGAIN; 1570 goto done_deref; 1571 } 1572 if (flags & JAIL_USE_DESC) { 1573 /* Get the jail from its descriptor. */ 1574 error = jaildesc_find(td, jfd_in, &pr, &jdcred); 1575 if (error) { 1576 vfs_opterror(opts, error == ENOENT ? 1577 "descriptor to dead jail" : 1578 "not a jail descriptor"); 1579 goto done_deref; 1580 } 1581 drflags |= PD_DEREF; 1582 error = priv_check_cred(jdcred, PRIV_JAIL_SET); 1583 if (error == 0 && (flags & JAIL_ATTACH)) 1584 error = priv_check_cred(jdcred, PRIV_JAIL_ATTACH); 1585 crfree(jdcred); 1586 if (error) 1587 goto done_deref; 1588 mtx_lock(&pr->pr_mtx); 1589 drflags |= PD_LOCKED; 1590 if (cuflags == JAIL_CREATE) { 1591 error = EEXIST; 1592 vfs_opterror(opts, "jail %d already exists", 1593 pr->pr_id); 1594 goto done_deref; 1595 } 1596 if (!prison_isalive(pr)) { 1597 /* While a jid can be resurrected, the prison 1598 * itself cannot. 1599 */ 1600 error = ENOENT; 1601 vfs_opterror(opts, "jail %d is dying", pr->pr_id); 1602 goto done_deref; 1603 } 1604 if (jid != 0 && jid != pr->pr_id) { 1605 error = EINVAL; 1606 vfs_opterror(opts, "cannot change jid"); 1607 goto done_deref; 1608 } 1609 jid = pr->pr_id; 1610 } else if (jid != 0) { 1611 if (jid < 0) { 1612 error = EINVAL; 1613 vfs_opterror(opts, "negative jid"); 1614 goto done_deref; 1615 } 1616 /* 1617 * See if a requested jid already exists. Keep track of 1618 * where it can be inserted later. 1619 */ 1620 TAILQ_FOREACH(inspr, &allprison, pr_list) { 1621 if (inspr->pr_id < jid) 1622 continue; 1623 if (inspr->pr_id > jid) 1624 break; 1625 if (prison_isalive(inspr)) { 1626 pr = inspr; 1627 mtx_lock(&pr->pr_mtx); 1628 drflags |= PD_LOCKED; 1629 } else { 1630 /* Note a dying jail to handle later. */ 1631 deadpr = inspr; 1632 } 1633 inspr = NULL; 1634 break; 1635 } 1636 if (cuflags == JAIL_CREATE && pr != NULL) { 1637 /* 1638 * Even creators that cannot see the jail will 1639 * get EEXIST. 1640 */ 1641 error = EEXIST; 1642 vfs_opterror(opts, "jail %d already exists", jid); 1643 goto done_deref; 1644 } 1645 if ((pr == NULL) 1646 ? cuflags == JAIL_UPDATE 1647 : !prison_ischild(mypr, pr)) { 1648 /* 1649 * Updaters get ENOENT for nonexistent jails, 1650 * or for jails they cannot see. The latter 1651 * case is true even for CREATE | UPDATE, 1652 * which normally cannot give this error. 1653 */ 1654 error = ENOENT; 1655 vfs_opterror(opts, "jail %d not found", jid); 1656 goto done_deref; 1657 } 1658 } 1659 /* 1660 * If the caller provided a name, look for a jail by that name. 1661 * This has different semantics for creates and updates keyed by jid 1662 * (where the name must not already exist in a different jail), 1663 * and updates keyed by the name itself (where the name must exist 1664 * because that is the jail being updated). 1665 */ 1666 namelc = NULL; 1667 if (name != NULL) { 1668 namelc = strrchr(name, '.'); 1669 if (namelc == NULL) 1670 namelc = name; 1671 else { 1672 /* 1673 * This is a hierarchical name. Split it into the 1674 * parent and child names, and make sure the parent 1675 * exists or matches an already found jail. 1676 */ 1677 if (pr != NULL) { 1678 if (strncmp(name, ppr->pr_name, namelc - name) 1679 || ppr->pr_name[namelc - name] != '\0') { 1680 error = EINVAL; 1681 vfs_opterror(opts, 1682 "cannot change jail's parent"); 1683 goto done_deref; 1684 } 1685 } else { 1686 *namelc = '\0'; 1687 ppr = prison_find_name(mypr, name); 1688 if (ppr == NULL) { 1689 error = ENOENT; 1690 vfs_opterror(opts, 1691 "jail \"%s\" not found", name); 1692 goto done_deref; 1693 } 1694 mtx_unlock(&ppr->pr_mtx); 1695 if (!prison_isalive(ppr)) { 1696 error = ENOENT; 1697 vfs_opterror(opts, 1698 "jail \"%s\" is dying", name); 1699 goto done_deref; 1700 } 1701 *namelc = '.'; 1702 } 1703 namelc++; 1704 } 1705 if (namelc[0] != '\0') { 1706 pnamelen = 1707 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1708 FOREACH_PRISON_CHILD(ppr, tpr) { 1709 if (tpr == pr || !prison_isalive(tpr) || 1710 strcmp(tpr->pr_name + pnamelen, namelc)) 1711 continue; 1712 if (cuflags == JAIL_CREATE || pr != NULL) { 1713 /* 1714 * Create, or update(jid): name must 1715 * not exist in an active sibling jail. 1716 */ 1717 error = EEXIST; 1718 vfs_opterror(opts, 1719 "jail \"%s\" already exists", name); 1720 goto done_deref; 1721 } 1722 /* Use this jail for updates. */ 1723 pr = tpr; 1724 mtx_lock(&pr->pr_mtx); 1725 drflags |= PD_LOCKED; 1726 break; 1727 } 1728 /* 1729 * Update: name must exist if no jid is specified. 1730 * As with the jid case, the jail must be currently 1731 * visible, or else even CREATE | UPDATE will get 1732 * an error. 1733 */ 1734 if ((pr == NULL) 1735 ? cuflags == JAIL_UPDATE 1736 : !prison_isalive(pr)) { 1737 error = ENOENT; 1738 vfs_opterror(opts, "jail \"%s\" not found", 1739 name); 1740 goto done_deref; 1741 } 1742 } 1743 } 1744 /* Update: must provide a desc, jid, or name. */ 1745 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1746 error = ENOENT; 1747 vfs_opterror(opts, "update specified no jail"); 1748 goto done_deref; 1749 } 1750 1751 /* If there's no prison to update, create a new one and link it in. */ 1752 created = pr == NULL; 1753 if (created) { 1754 #ifdef MAC 1755 error = mac_prison_check_create(td->td_ucred, opts, flags); 1756 if (error != 0) 1757 goto done_deref; 1758 #endif 1759 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1760 if (tpr->pr_childcount >= tpr->pr_childmax) { 1761 error = EPERM; 1762 vfs_opterror(opts, "prison limit exceeded"); 1763 goto done_deref; 1764 } 1765 1766 if (deadpr != NULL) { 1767 /* 1768 * The prison being created has the same ID as a dying 1769 * one. Handle this by giving the dying jail a new ID. 1770 * This may cause some confusion to user space, but 1771 * only to those listing dying jails. 1772 */ 1773 deadid = get_next_deadid(&dinspr); 1774 if (deadid == 0) { 1775 error = EAGAIN; 1776 vfs_opterror(opts, "no available jail IDs"); 1777 goto done_deref; 1778 } 1779 mtx_lock(&deadpr->pr_mtx); 1780 deadpr->pr_id = deadid; 1781 mtx_unlock(&deadpr->pr_mtx); 1782 if (dinspr == deadpr) 1783 inspr = deadpr; 1784 else { 1785 inspr = TAILQ_NEXT(deadpr, pr_list); 1786 TAILQ_REMOVE(&allprison, deadpr, pr_list); 1787 if (dinspr != NULL) 1788 TAILQ_INSERT_AFTER(&allprison, dinspr, 1789 deadpr, pr_list); 1790 else 1791 TAILQ_INSERT_HEAD(&allprison, deadpr, 1792 pr_list); 1793 } 1794 } 1795 if (jid == 0 && (jid = get_next_prid(&inspr)) == 0) { 1796 error = EAGAIN; 1797 vfs_opterror(opts, "no available jail IDs"); 1798 goto done_deref; 1799 } 1800 1801 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1802 pr->pr_state = PRISON_STATE_INVALID; 1803 refcount_init(&pr->pr_ref, 1); 1804 refcount_init(&pr->pr_uref, 0); 1805 drflags |= PD_DEREF; 1806 LIST_INIT(&pr->pr_children); 1807 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1808 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1809 1810 pr->pr_id = jid; 1811 if (inspr != NULL) 1812 TAILQ_INSERT_BEFORE(inspr, pr, pr_list); 1813 else 1814 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1815 1816 pr->pr_parent = ppr; 1817 prison_hold(ppr); 1818 prison_proc_hold(ppr); 1819 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1820 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1821 tpr->pr_childcount++; 1822 pr->pr_klist = knlist_alloc(&pr->pr_mtx); 1823 1824 /* Set some default values, and inherit some from the parent. */ 1825 if (namelc == NULL) 1826 namelc = ""; 1827 if (path == NULL) { 1828 path = "/"; 1829 root = ppr->pr_root; 1830 vref(root); 1831 } 1832 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1833 pr->pr_flags |= PR_HOST; 1834 #if defined(INET) || defined(INET6) 1835 #ifdef VIMAGE 1836 if (!(pr_flags & PR_VNET)) 1837 #endif 1838 { 1839 #ifdef INET 1840 if (!(ch_flags & PR_IP4_USER)) 1841 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1842 else if (!(pr_flags & PR_IP4_USER)) { 1843 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1844 prison_ip_dup(ppr, pr, PR_INET); 1845 } 1846 #endif 1847 #ifdef INET6 1848 if (!(ch_flags & PR_IP6_USER)) 1849 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1850 else if (!(pr_flags & PR_IP6_USER)) { 1851 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1852 prison_ip_dup(ppr, pr, PR_INET6); 1853 } 1854 #endif 1855 } 1856 #endif 1857 /* Source address selection is always on by default. */ 1858 pr->pr_flags |= _PR_IP_SADDRSEL; 1859 1860 pr->pr_securelevel = ppr->pr_securelevel; 1861 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1862 pr->pr_enforce_statfs = jail_default_enforce_statfs; 1863 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1864 1865 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1866 if (osrelstr == NULL) 1867 strlcpy(pr->pr_osrelease, ppr->pr_osrelease, 1868 sizeof(pr->pr_osrelease)); 1869 else 1870 strlcpy(pr->pr_osrelease, osrelstr, 1871 sizeof(pr->pr_osrelease)); 1872 1873 #ifdef VIMAGE 1874 /* 1875 * Allocate a new vnet if specified. 1876 * 1877 * Set PR_VNET now if so, so that the vnet is disposed of 1878 * properly when the jail is destroyed. 1879 */ 1880 if (pr_flags & PR_VNET) { 1881 pr->pr_flags |= PR_VNET; 1882 pr->pr_vnet = vnet_alloc(); 1883 } else { 1884 pr->pr_vnet = ppr->pr_vnet; 1885 } 1886 #endif 1887 /* 1888 * Allocate a dedicated cpuset for each jail. 1889 * Unlike other initial settings, this may return an error. 1890 */ 1891 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1892 if (error) 1893 goto done_deref; 1894 1895 #ifdef MAC 1896 error = mac_prison_init(pr, M_WAITOK); 1897 MPASS(error == 0); 1898 1899 mtx_assert(&pr->pr_mtx, MA_OWNED); 1900 #else 1901 mtx_lock(&pr->pr_mtx); 1902 #endif 1903 drflags |= PD_LOCKED; 1904 } else { 1905 /* 1906 * Grab a reference for existing prisons, to ensure they 1907 * continue to exist for the duration of the call. 1908 */ 1909 if (!(drflags & PD_DEREF)) { 1910 prison_hold(pr); 1911 drflags |= PD_DEREF; 1912 } 1913 #ifdef MAC 1914 error = mac_prison_check_set(td->td_ucred, pr, opts, flags); 1915 if (error != 0) 1916 goto done_deref; 1917 #endif 1918 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1919 if ((pr->pr_flags & PR_VNET) && 1920 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1921 error = EINVAL; 1922 vfs_opterror(opts, 1923 "vnet jails cannot have IP address restrictions"); 1924 goto done_deref; 1925 } 1926 #endif 1927 #ifdef INET 1928 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1929 error = EINVAL; 1930 vfs_opterror(opts, 1931 "ip4 cannot be changed after creation"); 1932 goto done_deref; 1933 } 1934 #endif 1935 #ifdef INET6 1936 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1937 error = EINVAL; 1938 vfs_opterror(opts, 1939 "ip6 cannot be changed after creation"); 1940 goto done_deref; 1941 } 1942 #endif 1943 } 1944 1945 /* Do final error checking before setting anything. */ 1946 if (gotslevel) { 1947 if (slevel < ppr->pr_securelevel) { 1948 error = EPERM; 1949 goto done_deref; 1950 } 1951 } 1952 if (gotchildmax) { 1953 if (childmax >= ppr->pr_childmax) { 1954 error = EPERM; 1955 goto done_deref; 1956 } 1957 } 1958 if (gotenforce) { 1959 if (enforce < ppr->pr_enforce_statfs) { 1960 error = EPERM; 1961 goto done_deref; 1962 } 1963 } 1964 if (gotrsnum) { 1965 /* 1966 * devfs_rsnum is a uint16_t 1967 */ 1968 if (rsnum < 0 || rsnum > 65535) { 1969 error = EINVAL; 1970 goto done_deref; 1971 } 1972 /* 1973 * Nested jails always inherit parent's devfs ruleset 1974 */ 1975 if (jailed(td->td_ucred)) { 1976 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1977 error = EPERM; 1978 goto done_deref; 1979 } else 1980 rsnum = ppr->pr_devfs_rsnum; 1981 } 1982 } 1983 #ifdef INET 1984 if (ip4s > 0) { 1985 if ((ppr->pr_flags & PR_IP4) && 1986 !prison_ip_parent_match(ppr->pr_addrs[PR_INET], ip4, 1987 PR_INET)) { 1988 error = EPERM; 1989 goto done_deref; 1990 } 1991 if (!prison_ip_conflict_check(ppr, pr, ip4, PR_INET)) { 1992 error = EADDRINUSE; 1993 vfs_opterror(opts, "IPv4 addresses clash"); 1994 goto done_deref; 1995 } 1996 } 1997 #endif 1998 #ifdef INET6 1999 if (ip6s > 0) { 2000 if ((ppr->pr_flags & PR_IP6) && 2001 !prison_ip_parent_match(ppr->pr_addrs[PR_INET6], ip6, 2002 PR_INET6)) { 2003 error = EPERM; 2004 goto done_deref; 2005 } 2006 if (!prison_ip_conflict_check(ppr, pr, ip6, PR_INET6)) { 2007 error = EADDRINUSE; 2008 vfs_opterror(opts, "IPv6 addresses clash"); 2009 goto done_deref; 2010 } 2011 } 2012 #endif 2013 onamelen = namelen = 0; 2014 if (namelc != NULL) { 2015 /* Give a default name of the jid. Also allow the name to be 2016 * explicitly the jid - but not any other number, and only in 2017 * normal form (no leading zero/etc). 2018 */ 2019 if (namelc[0] == '\0') 2020 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 2021 else if ((strtoul(namelc, &p, 10) != jid || 2022 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 2023 error = EINVAL; 2024 vfs_opterror(opts, 2025 "name cannot be numeric (unless it is the jid)"); 2026 goto done_deref; 2027 } 2028 /* 2029 * Make sure the name isn't too long for the prison or its 2030 * children. 2031 */ 2032 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 2033 onamelen = strlen(pr->pr_name + pnamelen); 2034 namelen = strlen(namelc); 2035 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 2036 error = ENAMETOOLONG; 2037 goto done_deref; 2038 } 2039 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 2040 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 2041 sizeof(pr->pr_name)) { 2042 error = ENAMETOOLONG; 2043 goto done_deref; 2044 } 2045 } 2046 } 2047 pr_allow_diff = pr_allow & ~ppr->pr_allow; 2048 if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) { 2049 error = EPERM; 2050 goto done_deref; 2051 } 2052 2053 /* 2054 * Let modules check their parameters. This requires unlocking and 2055 * then re-locking the prison, but this is still a valid state as long 2056 * as allprison_lock remains xlocked. 2057 */ 2058 mtx_unlock(&pr->pr_mtx); 2059 drflags &= ~PD_LOCKED; 2060 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 2061 if (error != 0) 2062 goto done_deref; 2063 mtx_lock(&pr->pr_mtx); 2064 drflags |= PD_LOCKED; 2065 2066 /* At this point, all valid parameters should have been noted. */ 2067 TAILQ_FOREACH(opt, opts, link) { 2068 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2069 error = EINVAL; 2070 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2071 goto done_deref; 2072 } 2073 } 2074 maybe_changed = true; 2075 2076 /* Set the parameters of the prison. */ 2077 #ifdef INET 2078 redo_ip4 = false; 2079 if (pr_flags & PR_IP4_USER) { 2080 pr->pr_flags |= PR_IP4; 2081 prison_ip_set(pr, PR_INET, ip4); 2082 ip4 = NULL; 2083 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 2084 #ifdef VIMAGE 2085 if (tpr->pr_flags & PR_VNET) { 2086 descend = 0; 2087 continue; 2088 } 2089 #endif 2090 if (!prison_ip_restrict(tpr, PR_INET, NULL)) { 2091 redo_ip4 = true; 2092 descend = 0; 2093 } 2094 } 2095 } 2096 #endif 2097 #ifdef INET6 2098 redo_ip6 = false; 2099 if (pr_flags & PR_IP6_USER) { 2100 pr->pr_flags |= PR_IP6; 2101 prison_ip_set(pr, PR_INET6, ip6); 2102 ip6 = NULL; 2103 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 2104 #ifdef VIMAGE 2105 if (tpr->pr_flags & PR_VNET) { 2106 descend = 0; 2107 continue; 2108 } 2109 #endif 2110 if (!prison_ip_restrict(tpr, PR_INET6, NULL)) { 2111 redo_ip6 = true; 2112 descend = 0; 2113 } 2114 } 2115 } 2116 #endif 2117 if (gotslevel) { 2118 pr->pr_securelevel = slevel; 2119 /* Set all child jails to be at least this level. */ 2120 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 2121 if (tpr->pr_securelevel < slevel) 2122 tpr->pr_securelevel = slevel; 2123 } 2124 if (gotchildmax) { 2125 pr->pr_childmax = childmax; 2126 /* Set all child jails to under this limit. */ 2127 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 2128 if (tpr->pr_childmax > childmax - level) 2129 tpr->pr_childmax = childmax > level 2130 ? childmax - level : 0; 2131 } 2132 if (gotenforce) { 2133 pr->pr_enforce_statfs = enforce; 2134 /* Pass this restriction on to the children. */ 2135 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 2136 if (tpr->pr_enforce_statfs < enforce) 2137 tpr->pr_enforce_statfs = enforce; 2138 } 2139 if (gotrsnum) { 2140 pr->pr_devfs_rsnum = rsnum; 2141 /* Pass this restriction on to the children. */ 2142 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 2143 tpr->pr_devfs_rsnum = rsnum; 2144 } 2145 if (namelc != NULL) { 2146 if (ppr == &prison0) 2147 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 2148 else 2149 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 2150 ppr->pr_name, namelc); 2151 /* Change this component of child names. */ 2152 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 2153 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 2154 strlen(tpr->pr_name + onamelen) + 1); 2155 bcopy(pr->pr_name, tpr->pr_name, namelen); 2156 } 2157 } 2158 if (path != NULL) { 2159 /* Try to keep a real-rooted full pathname. */ 2160 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 2161 pr->pr_root = root; 2162 root = NULL; 2163 } 2164 if (PR_HOST & ch_flags & ~pr_flags) { 2165 if (pr->pr_flags & PR_HOST) { 2166 /* 2167 * Copy the parent's host info. As with pr_ip4 above, 2168 * the lack of a lock on the parent is not a problem; 2169 * it is always set with allprison_lock at least 2170 * shared, and is held exclusively here. 2171 */ 2172 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 2173 sizeof(pr->pr_hostname)); 2174 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 2175 sizeof(pr->pr_domainname)); 2176 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 2177 sizeof(pr->pr_hostuuid)); 2178 pr->pr_hostid = pr->pr_parent->pr_hostid; 2179 } 2180 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 2181 /* Set this prison, and any descendants without PR_HOST. */ 2182 if (host != NULL) 2183 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 2184 if (domain != NULL) 2185 strlcpy(pr->pr_domainname, domain, 2186 sizeof(pr->pr_domainname)); 2187 if (uuid != NULL) 2188 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 2189 if (gothid) 2190 pr->pr_hostid = hid; 2191 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 2192 if (tpr->pr_flags & PR_HOST) 2193 descend = 0; 2194 else { 2195 if (host != NULL) 2196 strlcpy(tpr->pr_hostname, 2197 pr->pr_hostname, 2198 sizeof(tpr->pr_hostname)); 2199 if (domain != NULL) 2200 strlcpy(tpr->pr_domainname, 2201 pr->pr_domainname, 2202 sizeof(tpr->pr_domainname)); 2203 if (uuid != NULL) 2204 strlcpy(tpr->pr_hostuuid, 2205 pr->pr_hostuuid, 2206 sizeof(tpr->pr_hostuuid)); 2207 if (gothid) 2208 tpr->pr_hostid = hid; 2209 } 2210 } 2211 } 2212 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 2213 if ((tallow = ch_allow & ~pr_allow)) 2214 prison_set_allow_locked(pr, tallow, 0); 2215 /* 2216 * Persistent prisons get an extra reference, and prisons losing their 2217 * persist flag lose that reference. 2218 */ 2219 if (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags)) { 2220 if (pr_flags & PR_PERSIST) { 2221 prison_hold(pr); 2222 /* 2223 * This may be a new prison's first user reference, 2224 * but wait to call it alive until after OSD calls 2225 * have had a chance to run (and perhaps to fail). 2226 */ 2227 refcount_acquire(&pr->pr_uref); 2228 } else { 2229 drflags |= PD_DEUREF; 2230 prison_free_not_last(pr); 2231 } 2232 } 2233 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 2234 2235 #ifdef MAC 2236 /* Apply any request MAC label before we let modules do their work. */ 2237 if (gotmaclabel) { 2238 error = mac_set_prison_core(td, pr, mac_set_prison_data); 2239 if (error) { 2240 vfs_opterror(opts, "mac relabel denied"); 2241 goto done_deref; 2242 } 2243 } 2244 #endif 2245 mtx_unlock(&pr->pr_mtx); 2246 drflags &= ~PD_LOCKED; 2247 /* 2248 * Any errors past this point will need to de-persist newly created 2249 * prisons, as well as call remove methods. 2250 */ 2251 if (created) 2252 drflags |= PD_KILL; 2253 2254 #ifdef RACCT 2255 if (racct_enable && created) 2256 prison_racct_attach(pr); 2257 #endif 2258 2259 /* Locks may have prevented a complete restriction of child IP 2260 * addresses. If so, allocate some more memory and try again. 2261 */ 2262 #ifdef INET 2263 while (redo_ip4) { 2264 ip4s = pr->pr_addrs[PR_INET]->ips; 2265 MPASS(ip4 == NULL); 2266 ip4 = prison_ip_alloc(PR_INET, ip4s, M_WAITOK); 2267 mtx_lock(&pr->pr_mtx); 2268 redo_ip4 = false; 2269 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 2270 #ifdef VIMAGE 2271 if (tpr->pr_flags & PR_VNET) { 2272 descend = 0; 2273 continue; 2274 } 2275 #endif 2276 if (!prison_ip_restrict(tpr, PR_INET, &ip4)) 2277 redo_ip4 = true; 2278 } 2279 mtx_unlock(&pr->pr_mtx); 2280 } 2281 #endif 2282 #ifdef INET6 2283 while (redo_ip6) { 2284 ip6s = pr->pr_addrs[PR_INET6]->ips; 2285 MPASS(ip6 == NULL); 2286 ip6 = prison_ip_alloc(PR_INET6, ip6s, M_WAITOK); 2287 mtx_lock(&pr->pr_mtx); 2288 redo_ip6 = false; 2289 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 2290 #ifdef VIMAGE 2291 if (tpr->pr_flags & PR_VNET) { 2292 descend = 0; 2293 continue; 2294 } 2295 #endif 2296 if (!prison_ip_restrict(tpr, PR_INET6, &ip6)) 2297 redo_ip6 = true; 2298 } 2299 mtx_unlock(&pr->pr_mtx); 2300 } 2301 #endif 2302 2303 /* Let the modules do their work. */ 2304 if (created) { 2305 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 2306 if (error) 2307 goto done_deref; 2308 } 2309 error = osd_jail_call(pr, PR_METHOD_SET, opts); 2310 if (error) 2311 goto done_deref; 2312 2313 /* 2314 * A new prison is now ready to be seen; either it has gained a user 2315 * reference via persistence, or is about to gain one via attachment. 2316 */ 2317 if (created) { 2318 sx_assert(&allprison_lock, SX_XLOCKED); 2319 prison_knote(ppr, NOTE_JAIL_CHILD | pr->pr_id); 2320 #ifdef MAC 2321 /* 2322 * Note that mac_prison_created() assumes that it's called in a 2323 * sleepable context. 2324 */ 2325 mac_prison_created(td->td_ucred, pr); 2326 #endif 2327 mtx_lock(&pr->pr_mtx); 2328 drflags |= PD_LOCKED; 2329 pr->pr_state = PRISON_STATE_ALIVE; 2330 } 2331 2332 /* 2333 * Attach this process to the prison if requested. This will 2334 * unlock allprison_lock, meaning changes are now user-visible. 2335 */ 2336 if (flags & JAIL_ATTACH) { 2337 #ifdef MAC 2338 error = mac_prison_check_attach(td->td_ucred, pr); 2339 if (error != 0) { 2340 vfs_opterror(opts, 2341 "attach operation denied by MAC policy"); 2342 goto done_deref; 2343 } 2344 #endif 2345 error = do_jail_attach(td, pr, &drflags); 2346 if (error) { 2347 vfs_opterror(opts, "attach failed"); 2348 goto done_deref; 2349 } 2350 } 2351 2352 #ifdef RACCT 2353 if (racct_enable && !created) { 2354 if (drflags & PD_LOCKED) { 2355 mtx_unlock(&pr->pr_mtx); 2356 drflags &= ~PD_LOCKED; 2357 } 2358 if (drflags & PD_LIST_XLOCKED) { 2359 sx_xunlock(&allprison_lock); 2360 drflags &= ~PD_LIST_XLOCKED; 2361 } 2362 prison_racct_modify(pr); 2363 } 2364 #endif 2365 2366 if (created && pr != &prison0 && (pr->pr_allow & PR_ALLOW_NFSD) != 0 && 2367 (pr->pr_root->v_vflag & VV_ROOT) == 0) 2368 printf("Warning jail jid=%d: mountd/nfsd requires a separate" 2369 " file system\n", pr->pr_id); 2370 2371 /* 2372 * Now that the prison is fully created without error, set the 2373 * jail descriptor if one was requested. This is the only 2374 * parameter that is returned to the caller (except the error 2375 * message). 2376 */ 2377 if (jfd_out >= 0) { 2378 if (!(drflags & PD_LOCKED)) { 2379 mtx_lock(&pr->pr_mtx); 2380 drflags |= PD_LOCKED; 2381 } 2382 jfd_pos = 2 * vfs_getopt_pos(opts, JAIL_PARAM_DESC) + 1; 2383 if (optuio->uio_segflg == UIO_SYSSPACE) 2384 *(int*)optuio->uio_iov[jfd_pos].iov_base = jfd_out; 2385 else 2386 (void)copyout(&jfd_out, 2387 optuio->uio_iov[jfd_pos].iov_base, sizeof(jfd_out)); 2388 jaildesc_set_prison(jfp_out, pr); 2389 } 2390 2391 drflags &= ~PD_KILL; 2392 td->td_retval[0] = pr->pr_id; 2393 2394 done_deref: 2395 /* 2396 * Report changes to kevent. This can happen even if the 2397 * system call fails, as changes might have been made before 2398 * the failure. 2399 */ 2400 if (maybe_changed && !created) 2401 prison_knote(pr, NOTE_JAIL_SET); 2402 /* Release any temporary prison holds and/or locks. */ 2403 if (pr != NULL) 2404 prison_deref(pr, drflags); 2405 else if (drflags & PD_LIST_SLOCKED) 2406 sx_sunlock(&allprison_lock); 2407 else if (drflags & PD_LIST_XLOCKED) 2408 sx_xunlock(&allprison_lock); 2409 if (root != NULL) 2410 vrele(root); 2411 done_errmsg: 2412 if (error) { 2413 /* Write the error message back to userspace. */ 2414 if (vfs_getopt(opts, JAIL_PARAM_ERRMSG, (void **)&errmsg, 2415 &errmsg_len) == 0 && errmsg_len > 0) { 2416 errmsg_pos = 2 * vfs_getopt_pos(opts, JAIL_PARAM_ERRMSG) + 1; 2417 if (optuio->uio_segflg == UIO_SYSSPACE) 2418 bcopy(errmsg, 2419 optuio->uio_iov[errmsg_pos].iov_base, 2420 errmsg_len); 2421 else 2422 (void)copyout(errmsg, 2423 optuio->uio_iov[errmsg_pos].iov_base, 2424 errmsg_len); 2425 } 2426 } 2427 done_free: 2428 /* Clean up other resources. */ 2429 #ifdef INET 2430 prison_ip_free(ip4); 2431 #endif 2432 #ifdef INET6 2433 prison_ip_free(ip6); 2434 #endif 2435 #ifdef MAC 2436 if (mac_set_prison_data != NULL) 2437 mac_set_prison_finish(td, error == 0, mac_set_prison_data); 2438 #endif 2439 if (jfp_out != NULL) 2440 fdrop(jfp_out, td); 2441 if (error && jfd_out >= 0) 2442 (void)kern_close(td, jfd_out); 2443 if (g_path != NULL) 2444 free(g_path, M_TEMP); 2445 if (opts != NULL) 2446 vfs_freeopts(opts); 2447 prison_free(mypr); 2448 if (flags & JAIL_ATTACH) 2449 prison_attach_thread_single_end(td); 2450 return (error); 2451 } 2452 2453 /* 2454 * Find the next available prison ID. Return the ID on success, or zero 2455 * on failure. Also set a pointer to the allprison list entry the prison 2456 * should be inserted before. 2457 */ 2458 static int 2459 get_next_prid(struct prison **insprp) 2460 { 2461 struct prison *inspr; 2462 int jid, maxid; 2463 2464 jid = lastprid % JAIL_MAX + 1; 2465 if (TAILQ_EMPTY(&allprison) || 2466 TAILQ_LAST(&allprison, prisonlist)->pr_id < jid) { 2467 /* 2468 * A common case is for all jails to be implicitly numbered, 2469 * which means they'll go on the end of the list, at least 2470 * for the first JAIL_MAX times. 2471 */ 2472 inspr = NULL; 2473 } else { 2474 /* 2475 * Take two passes through the allprison list: first starting 2476 * with the proposed jid, then ending with it. 2477 */ 2478 for (maxid = JAIL_MAX; maxid != 0; ) { 2479 TAILQ_FOREACH(inspr, &allprison, pr_list) { 2480 if (inspr->pr_id < jid) 2481 continue; 2482 if (inspr->pr_id > jid) { 2483 /* Found an opening. */ 2484 maxid = 0; 2485 break; 2486 } 2487 if (++jid > maxid) { 2488 if (lastprid == maxid || lastprid == 0) 2489 { 2490 /* 2491 * The entire legal range 2492 * has been traversed 2493 */ 2494 return 0; 2495 } 2496 /* Try again from the start. */ 2497 jid = 1; 2498 maxid = lastprid; 2499 break; 2500 } 2501 } 2502 if (inspr == NULL) { 2503 /* Found room at the end of the list. */ 2504 break; 2505 } 2506 } 2507 } 2508 *insprp = inspr; 2509 lastprid = jid; 2510 return (jid); 2511 } 2512 2513 /* 2514 * Find the next available ID for a renumbered dead prison. This is the same 2515 * as get_next_prid, but counting backward from the end of the range. 2516 */ 2517 static int 2518 get_next_deadid(struct prison **dinsprp) 2519 { 2520 struct prison *dinspr; 2521 int deadid, minid; 2522 2523 deadid = lastdeadid ? lastdeadid - 1 : JAIL_MAX; 2524 /* 2525 * Take two reverse passes through the allprison list: first 2526 * starting with the proposed deadid, then ending with it. 2527 */ 2528 for (minid = 1; minid != 0; ) { 2529 TAILQ_FOREACH_REVERSE(dinspr, &allprison, prisonlist, pr_list) { 2530 if (dinspr->pr_id > deadid) 2531 continue; 2532 if (dinspr->pr_id < deadid) { 2533 /* Found an opening. */ 2534 minid = 0; 2535 break; 2536 } 2537 if (--deadid < minid) { 2538 if (lastdeadid == minid || lastdeadid == 0) 2539 { 2540 /* 2541 * The entire legal range 2542 * has been traversed 2543 */ 2544 return 0; 2545 } 2546 /* Try again from the end. */ 2547 deadid = JAIL_MAX; 2548 minid = lastdeadid; 2549 break; 2550 } 2551 } 2552 if (dinspr == NULL) { 2553 /* Found room at the beginning of the list. */ 2554 break; 2555 } 2556 } 2557 *dinsprp = dinspr; 2558 lastdeadid = deadid; 2559 return (deadid); 2560 } 2561 2562 /* 2563 * struct jail_get_args { 2564 * struct iovec *iovp; 2565 * unsigned int iovcnt; 2566 * int flags; 2567 * }; 2568 */ 2569 int 2570 sys_jail_get(struct thread *td, struct jail_get_args *uap) 2571 { 2572 return (user_jail_get(td, uap->iovp, uap->iovcnt, uap->flags, 2573 copyinuio, updateiov)); 2574 } 2575 2576 int 2577 user_jail_get(struct thread *td, struct iovec *iovp, 2578 unsigned int iovcnt, int flags, copyinuio_t *copyinuio_f, 2579 updateiov_t *updateiov_f) 2580 { 2581 struct uio *auio; 2582 int error; 2583 2584 /* Check that we have an even number of iovecs. */ 2585 if (iovcnt & 1) 2586 return (EINVAL); 2587 2588 error = copyinuio_f(iovp, iovcnt, &auio); 2589 if (error) 2590 return (error); 2591 error = kern_jail_get(td, auio, flags); 2592 if (error == 0) 2593 error = updateiov_f(auio, iovp); 2594 freeuio(auio); 2595 return (error); 2596 } 2597 2598 int 2599 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 2600 { 2601 struct bool_flags *bf; 2602 struct file *jfp_out; 2603 struct jailsys_flags *jsf; 2604 struct prison *pr, *mypr; 2605 struct vfsopt *opt; 2606 struct vfsoptlist *opts; 2607 char *errmsg, *name; 2608 int drflags, error, errmsg_len, errmsg_pos, i, jid, len, pos; 2609 int jfd_in, jfd_out; 2610 unsigned f; 2611 2612 if (flags & ~JAIL_GET_MASK) 2613 return (EINVAL); 2614 if ((flags & (JAIL_USE_DESC | JAIL_AT_DESC)) == 2615 (JAIL_USE_DESC | JAIL_AT_DESC)) 2616 return (EINVAL); 2617 2618 /* Get the parameter list. */ 2619 error = vfs_buildopts(optuio, &opts); 2620 if (error) 2621 return (error); 2622 errmsg_pos = vfs_getopt_pos(opts, JAIL_PARAM_ERRMSG); 2623 mypr = td->td_ucred->cr_prison; 2624 prison_hold(mypr); 2625 pr = NULL; 2626 jfp_out = NULL; 2627 jfd_out = -1; 2628 2629 /* 2630 * Find the prison specified by one of: desc, lastjid, jid, name. 2631 */ 2632 sx_slock(&allprison_lock); 2633 drflags = PD_LIST_SLOCKED; 2634 2635 error = vfs_copyopt(opts, JAIL_PARAM_DESC, &jfd_in, sizeof(jfd_in)); 2636 if (error == ENOENT) { 2637 if (flags & (JAIL_AT_DESC | JAIL_GET_DESC | JAIL_OWN_DESC)) { 2638 vfs_opterror(opts, "missing desc"); 2639 goto done; 2640 } 2641 } else if (error == 0) { 2642 if (!(flags & (JAIL_USE_DESC | JAIL_AT_DESC | JAIL_GET_DESC | 2643 JAIL_OWN_DESC))) { 2644 error = EINVAL; 2645 vfs_opterror(opts, "unexpected desc"); 2646 goto done; 2647 } 2648 if (flags & JAIL_USE_DESC) { 2649 /* Get the jail from its descriptor. */ 2650 error = jaildesc_find(td, jfd_in, &pr, NULL); 2651 if (error) { 2652 vfs_opterror(opts, error == ENOENT ? 2653 "descriptor to dead jail" : 2654 "not a jail descriptor"); 2655 goto done; 2656 } 2657 drflags |= PD_DEREF; 2658 mtx_lock(&pr->pr_mtx); 2659 drflags |= PD_LOCKED; 2660 goto found_prison; 2661 } 2662 if (flags & JAIL_AT_DESC) { 2663 /* Look up jails based on the descriptor's prison. */ 2664 struct prison *jdpr; 2665 2666 error = jaildesc_find(td, jfd_in, &jdpr, NULL); 2667 if (error != 0) { 2668 vfs_opterror(opts, error == ENOENT ? 2669 "descriptor to dead jail" : 2670 "not a jail descriptor"); 2671 goto done; 2672 } 2673 prison_free(mypr); 2674 mypr = jdpr; 2675 } 2676 if (flags & (JAIL_GET_DESC | JAIL_OWN_DESC)) { 2677 /* Allocate a jail descriptor to return later. */ 2678 error = jaildesc_alloc(td, &jfp_out, &jfd_out, 2679 flags & JAIL_OWN_DESC); 2680 if (error) 2681 goto done; 2682 } 2683 } else 2684 goto done; 2685 2686 error = vfs_copyopt(opts, JAIL_PARAM_LASTJID, &jid, sizeof(jid)); 2687 if (error == 0) { 2688 TAILQ_FOREACH(pr, &allprison, pr_list) { 2689 if (pr->pr_id > jid && 2690 ((flags & JAIL_DYING) || prison_isalive(pr)) && 2691 prison_ischild(mypr, pr)) { 2692 mtx_lock(&pr->pr_mtx); 2693 drflags |= PD_LOCKED; 2694 #ifdef MAC 2695 /* 2696 * We special-case this one check because we 2697 * don't want MAC to break jail enumeration. We 2698 * need to just move on to the next accessible 2699 * and alive prison. 2700 */ 2701 error = mac_prison_check_get(td->td_ucred, pr, 2702 opts, flags); 2703 if (error != 0) { 2704 mtx_unlock(&pr->pr_mtx); 2705 drflags &= ~PD_LOCKED; 2706 continue; 2707 } 2708 2709 /* 2710 * Avoid potentially expensive trip back into 2711 * the MAC framework. 2712 */ 2713 goto found_prison_nomac_alive; 2714 #else 2715 goto found_prison; 2716 #endif 2717 } 2718 } 2719 error = ENOENT; 2720 vfs_opterror(opts, "no jail after %d", jid); 2721 goto done; 2722 } else if (error != ENOENT) 2723 goto done; 2724 2725 error = vfs_copyopt(opts, JAIL_PARAM_JID, &jid, sizeof(jid)); 2726 if (error == 0) { 2727 if (jid != 0) { 2728 pr = prison_find_child(mypr, jid); 2729 if (pr != NULL) { 2730 drflags |= PD_LOCKED; 2731 goto found_prison; 2732 } 2733 error = ENOENT; 2734 vfs_opterror(opts, "jail %d not found", jid); 2735 goto done; 2736 } 2737 } else if (error != ENOENT) 2738 goto done; 2739 2740 error = vfs_getopt(opts, JAIL_PARAM_NAME, (void **)&name, &len); 2741 if (error == 0) { 2742 if (len == 0 || name[len - 1] != '\0') { 2743 error = EINVAL; 2744 goto done; 2745 } 2746 pr = prison_find_name(mypr, name); 2747 if (pr != NULL) { 2748 drflags |= PD_LOCKED; 2749 goto found_prison; 2750 } 2751 error = ENOENT; 2752 vfs_opterror(opts, "jail \"%s\" not found", name); 2753 goto done; 2754 } else if (error != ENOENT) 2755 goto done; 2756 2757 vfs_opterror(opts, "no jail specified"); 2758 error = ENOENT; 2759 goto done; 2760 2761 found_prison: 2762 #ifdef MAC 2763 error = mac_prison_check_get(td->td_ucred, pr, opts, flags); 2764 if (error != 0) 2765 goto done; 2766 #endif 2767 if (!(prison_isalive(pr) || (flags & JAIL_DYING))) { 2768 error = ENOENT; 2769 if (pr->pr_name[0] != '0' && isdigit(pr->pr_name[0])) { 2770 vfs_opterror(opts, "jail %d is dying", 2771 pr->pr_id); 2772 } else { 2773 vfs_opterror(opts, "jail \"%s\" (%d) is dying", 2774 pr->pr_name, pr->pr_id); 2775 } 2776 goto done; 2777 } 2778 #ifdef MAC 2779 found_prison_nomac_alive: 2780 #endif 2781 /* Get the parameters of the prison. */ 2782 if (!(drflags & PD_DEREF)) { 2783 prison_hold(pr); 2784 drflags |= PD_DEREF; 2785 } 2786 td->td_retval[0] = pr->pr_id; 2787 if (jfd_out >= 0) { 2788 error = vfs_setopt(opts, JAIL_PARAM_DESC, &jfd_out, sizeof(jfd_out)); 2789 if (error != 0 && error != ENOENT) 2790 goto done; 2791 jaildesc_set_prison(jfp_out, pr); 2792 } 2793 error = vfs_setopt(opts, JAIL_PARAM_JID, &pr->pr_id, sizeof(pr->pr_id)); 2794 if (error != 0 && error != ENOENT) 2795 goto done; 2796 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2797 error = vfs_setopt(opts, JAIL_PARAM_PARENT, &i, sizeof(i)); 2798 if (error != 0 && error != ENOENT) 2799 goto done; 2800 error = vfs_setopts(opts, JAIL_PARAM_NAME, prison_name(mypr, pr)); 2801 if (error != 0 && error != ENOENT) 2802 goto done; 2803 error = vfs_setopt(opts, JAIL_PARAM_CPUSET_ID, &pr->pr_cpuset->cs_id, 2804 sizeof(pr->pr_cpuset->cs_id)); 2805 if (error != 0 && error != ENOENT) 2806 goto done; 2807 error = vfs_setopts(opts, JAIL_PARAM_PATH, prison_path(mypr, pr)); 2808 if (error != 0 && error != ENOENT) 2809 goto done; 2810 #ifdef INET 2811 error = vfs_setopt_part(opts, JAIL_PARAM_IP4_ADDR, 2812 pr->pr_addrs[PR_INET]->pr_ip, 2813 pr->pr_addrs[PR_INET] ? pr->pr_addrs[PR_INET]->ips * 2814 pr_families[PR_INET].size : 0 ); 2815 if (error != 0 && error != ENOENT) 2816 goto done; 2817 #endif 2818 #ifdef INET6 2819 error = vfs_setopt_part(opts, JAIL_PARAM_IP6_ADDR, 2820 pr->pr_addrs[PR_INET6]->pr_ip, 2821 pr->pr_addrs[PR_INET6] ? pr->pr_addrs[PR_INET6]->ips * 2822 pr_families[PR_INET6].size : 0 ); 2823 if (error != 0 && error != ENOENT) 2824 goto done; 2825 #endif 2826 error = vfs_setopt(opts, JAIL_PARAM_SECURELEVEL, &pr->pr_securelevel, 2827 sizeof(pr->pr_securelevel)); 2828 if (error != 0 && error != ENOENT) 2829 goto done; 2830 error = vfs_setopt(opts, JAIL_PARAM_CHILDREN_CUR, &pr->pr_childcount, 2831 sizeof(pr->pr_childcount)); 2832 if (error != 0 && error != ENOENT) 2833 goto done; 2834 error = vfs_setopt(opts, JAIL_PARAM_CHILDREN_MAX, &pr->pr_childmax, 2835 sizeof(pr->pr_childmax)); 2836 if (error != 0 && error != ENOENT) 2837 goto done; 2838 error = vfs_setopts(opts, JAIL_PARAM_HOST_HOSTNAME, pr->pr_hostname); 2839 if (error != 0 && error != ENOENT) 2840 goto done; 2841 error = vfs_setopts(opts, JAIL_PARAM_HOST_DOMAINNAME, pr->pr_domainname); 2842 if (error != 0 && error != ENOENT) 2843 goto done; 2844 error = vfs_setopts(opts, JAIL_PARAM_HOST_HOSTUUID, pr->pr_hostuuid); 2845 if (error != 0 && error != ENOENT) 2846 goto done; 2847 #ifdef COMPAT_FREEBSD32 2848 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2849 uint32_t hid32 = pr->pr_hostid; 2850 2851 error = vfs_setopt(opts, JAIL_PARAM_HOST_HOSTID, &hid32, sizeof(hid32)); 2852 } else 2853 #endif 2854 error = vfs_setopt(opts, JAIL_PARAM_HOST_HOSTID, &pr->pr_hostid, 2855 sizeof(pr->pr_hostid)); 2856 if (error != 0 && error != ENOENT) 2857 goto done; 2858 error = vfs_setopt(opts, JAIL_PARAM_ENFORCE_STATFS, &pr->pr_enforce_statfs, 2859 sizeof(pr->pr_enforce_statfs)); 2860 if (error != 0 && error != ENOENT) 2861 goto done; 2862 error = vfs_setopt(opts, JAIL_PARAM_DEVFS_RULESET, &pr->pr_devfs_rsnum, 2863 sizeof(pr->pr_devfs_rsnum)); 2864 if (error != 0 && error != ENOENT) 2865 goto done; 2866 for (bf = pr_flag_bool; 2867 bf < pr_flag_bool + nitems(pr_flag_bool); 2868 bf++) { 2869 i = (pr->pr_flags & bf->flag) ? 1 : 0; 2870 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2871 if (error != 0 && error != ENOENT) 2872 goto done; 2873 i = !i; 2874 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2875 if (error != 0 && error != ENOENT) 2876 goto done; 2877 } 2878 for (jsf = pr_flag_jailsys; 2879 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 2880 jsf++) { 2881 f = pr->pr_flags & (jsf->disable | jsf->new); 2882 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE 2883 : (f == jsf->new) ? JAIL_SYS_NEW 2884 : JAIL_SYS_INHERIT; 2885 error = vfs_setopt(opts, jsf->name, &i, sizeof(i)); 2886 if (error != 0 && error != ENOENT) 2887 goto done; 2888 } 2889 for (bf = pr_flag_allow; 2890 bf < pr_flag_allow + nitems(pr_flag_allow) && 2891 atomic_load_int(&bf->flag) != 0; 2892 bf++) { 2893 i = (pr->pr_allow & bf->flag) ? 1 : 0; 2894 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2895 if (error != 0 && error != ENOENT) 2896 goto done; 2897 i = !i; 2898 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2899 if (error != 0 && error != ENOENT) 2900 goto done; 2901 } 2902 i = !prison_isalive(pr); 2903 error = vfs_setopt(opts, JAIL_PARAM_DYING, &i, sizeof(i)); 2904 if (error != 0 && error != ENOENT) 2905 goto done; 2906 i = !i; 2907 error = vfs_setopt(opts, JAIL_PARAM_NODYING, &i, sizeof(i)); 2908 if (error != 0 && error != ENOENT) 2909 goto done; 2910 error = vfs_setopt(opts, JAIL_PARAM_OSRELDATE, &pr->pr_osreldate, 2911 sizeof(pr->pr_osreldate)); 2912 if (error != 0 && error != ENOENT) 2913 goto done; 2914 error = vfs_setopts(opts, JAIL_PARAM_OSRELEASE, pr->pr_osrelease); 2915 if (error != 0 && error != ENOENT) 2916 goto done; 2917 2918 #ifdef MAC 2919 /* 2920 * We get the MAC label last because we'll let the MAC framework drop 2921 * pr_mtx to externalize the label. 2922 */ 2923 error = mac_get_prison(td, pr, opts); 2924 mtx_assert(&pr->pr_mtx, MA_NOTOWNED); 2925 drflags &= ~PD_LOCKED; 2926 if (error != 0 && error != ENOENT) 2927 goto done; 2928 #else 2929 mtx_unlock(&pr->pr_mtx); 2930 drflags &= ~PD_LOCKED; 2931 #endif 2932 2933 /* Get the module parameters. */ 2934 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2935 if (error) 2936 goto done; 2937 prison_deref(pr, drflags); 2938 pr = NULL; 2939 drflags = 0; 2940 2941 /* By now, all parameters should have been noted. */ 2942 TAILQ_FOREACH(opt, opts, link) { 2943 if (!opt->seen && 2944 (strstr(opt->name, JAIL_META_PRIVATE ".") == opt->name || 2945 strstr(opt->name, JAIL_META_SHARED ".") == opt->name)) { 2946 /* Communicate back a missing key. */ 2947 free(opt->value, M_MOUNT); 2948 opt->value = NULL; 2949 opt->len = 0; 2950 continue; 2951 } 2952 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2953 error = EINVAL; 2954 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2955 goto done; 2956 } 2957 } 2958 2959 /* Write the fetched parameters back to userspace. */ 2960 error = 0; 2961 TAILQ_FOREACH(opt, opts, link) { 2962 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2963 pos = 2 * opt->pos + 1; 2964 optuio->uio_iov[pos].iov_len = opt->len; 2965 if (opt->value != NULL) { 2966 if (optuio->uio_segflg == UIO_SYSSPACE) { 2967 bcopy(opt->value, 2968 optuio->uio_iov[pos].iov_base, 2969 opt->len); 2970 } else { 2971 error = copyout(opt->value, 2972 optuio->uio_iov[pos].iov_base, 2973 opt->len); 2974 if (error) 2975 break; 2976 } 2977 } 2978 } 2979 } 2980 2981 done: 2982 /* Release any temporary prison holds and/or locks. */ 2983 if (pr != NULL) 2984 prison_deref(pr, drflags); 2985 else if (drflags & PD_LIST_SLOCKED) 2986 sx_sunlock(&allprison_lock); 2987 else if (drflags & PD_LIST_XLOCKED) 2988 sx_xunlock(&allprison_lock); 2989 /* Clean up other resources. */ 2990 if (jfp_out != NULL) 2991 (void)fdrop(jfp_out, td); 2992 if (error && jfd_out >= 0) 2993 (void)kern_close(td, jfd_out); 2994 if (error && errmsg_pos >= 0) { 2995 /* Write the error message back to userspace. */ 2996 vfs_getopt(opts, JAIL_PARAM_ERRMSG, (void **)&errmsg, &errmsg_len); 2997 errmsg_pos = 2 * errmsg_pos + 1; 2998 if (errmsg_len > 0) { 2999 if (optuio->uio_segflg == UIO_SYSSPACE) 3000 bcopy(errmsg, 3001 optuio->uio_iov[errmsg_pos].iov_base, 3002 errmsg_len); 3003 else 3004 (void)copyout(errmsg, 3005 optuio->uio_iov[errmsg_pos].iov_base, 3006 errmsg_len); 3007 } 3008 } 3009 vfs_freeopts(opts); 3010 prison_free(mypr); 3011 return (error); 3012 } 3013 3014 /* 3015 * struct jail_remove_args { 3016 * int jid; 3017 * }; 3018 */ 3019 int 3020 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 3021 { 3022 struct prison *pr; 3023 int error; 3024 3025 error = priv_check(td, PRIV_JAIL_REMOVE); 3026 if (error) 3027 return (error); 3028 3029 sx_xlock(&allprison_lock); 3030 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 3031 if (pr == NULL) { 3032 sx_xunlock(&allprison_lock); 3033 return (EINVAL); 3034 } 3035 #ifdef MAC 3036 error = mac_prison_check_remove(td->td_ucred, pr); 3037 if (error != 0) { 3038 mtx_unlock(&pr->pr_mtx); 3039 sx_xunlock(&allprison_lock); 3040 return (error); 3041 } 3042 #endif 3043 prison_hold(pr); 3044 prison_remove(pr); 3045 return (0); 3046 } 3047 3048 /* 3049 * struct jail_remove_jd_args { 3050 * int fd; 3051 * }; 3052 */ 3053 int 3054 sys_jail_remove_jd(struct thread *td, struct jail_remove_jd_args *uap) 3055 { 3056 struct prison *pr; 3057 struct ucred *jdcred; 3058 int error; 3059 3060 error = jaildesc_find(td, uap->fd, &pr, &jdcred); 3061 if (error) 3062 return (error); 3063 error = priv_check_cred(jdcred, PRIV_JAIL_REMOVE); 3064 crfree(jdcred); 3065 #ifdef MAC 3066 if (error == 0) 3067 error = mac_prison_check_remove(td->td_ucred, pr); 3068 #endif 3069 if (error) { 3070 prison_free(pr); 3071 return (error); 3072 } 3073 sx_xlock(&allprison_lock); 3074 mtx_lock(&pr->pr_mtx); 3075 prison_remove(pr); 3076 return (0); 3077 } 3078 3079 /* 3080 * Begin the removal process for a prison. The allprison lock should 3081 * be held exclusively, and the prison should be both locked and held. 3082 */ 3083 void 3084 prison_remove(struct prison *pr) 3085 { 3086 sx_assert(&allprison_lock, SA_XLOCKED); 3087 mtx_assert(&pr->pr_mtx, MA_OWNED); 3088 prison_deref(pr, PD_KILL | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 3089 } 3090 3091 /* 3092 * struct jail_attach_args { 3093 * int jid; 3094 * }; 3095 */ 3096 int 3097 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 3098 { 3099 struct prison *pr; 3100 int drflags, error; 3101 3102 error = priv_check(td, PRIV_JAIL_ATTACH); 3103 if (error) 3104 return (error); 3105 /* Only let a single thread in the process try to attach at a time. */ 3106 error = prison_attach_thread_single(td); 3107 if (error != 0) 3108 return (error); 3109 3110 sx_slock(&allprison_lock); 3111 drflags = PD_LIST_SLOCKED; 3112 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 3113 if (pr == NULL) { 3114 error = EINVAL; 3115 goto done; 3116 } 3117 drflags |= PD_LOCKED; 3118 3119 #ifdef MAC 3120 error = mac_prison_check_attach(td->td_ucred, pr); 3121 if (error != 0) 3122 goto done; 3123 #endif 3124 3125 /* Do not allow a process to attach to a prison that is not alive. */ 3126 if (!prison_isalive(pr)) { 3127 error = EINVAL; 3128 goto done; 3129 } 3130 3131 error = do_jail_attach(td, pr, &drflags); 3132 3133 done: 3134 prison_deref(pr, drflags); 3135 prison_attach_thread_single_end(td); 3136 return (error); 3137 } 3138 3139 /* 3140 * struct jail_attach_jd_args { 3141 * int fd; 3142 * }; 3143 */ 3144 int 3145 sys_jail_attach_jd(struct thread *td, struct jail_attach_jd_args *uap) 3146 { 3147 struct prison *pr; 3148 struct ucred *jdcred; 3149 int drflags, error; 3150 3151 /* Only let a single thread in the process try to attach at a time. */ 3152 error = prison_attach_thread_single(td); 3153 if (error != 0) 3154 return (error); 3155 3156 sx_slock(&allprison_lock); 3157 drflags = PD_LIST_SLOCKED; 3158 pr = NULL; 3159 error = jaildesc_find(td, uap->fd, &pr, &jdcred); 3160 if (error) 3161 goto done; 3162 drflags |= PD_DEREF; 3163 error = priv_check_cred(jdcred, PRIV_JAIL_ATTACH); 3164 #ifdef MAC 3165 if (error == 0) 3166 error = mac_prison_check_attach(td->td_ucred, pr); 3167 #endif 3168 crfree(jdcred); 3169 if (error) 3170 goto done; 3171 3172 /* Do not allow a process to attach to a prison that is not alive. */ 3173 if (!prison_isalive(pr)) { 3174 error = EINVAL; 3175 goto done; 3176 } 3177 3178 error = do_jail_attach(td, pr, &drflags); 3179 3180 done: 3181 prison_deref(pr, drflags); 3182 prison_attach_thread_single_end(td); 3183 return (error); 3184 } 3185 3186 /* 3187 * Attach the current process to a prison. On entry, the allprison 3188 * lock should be at least shared. On exit, both it and the prison 3189 * itself will be unlocked, which will be refelected in *drflagsp. 3190 */ 3191 static int 3192 do_jail_attach(struct thread *td, struct prison *pr, int *drflagsp) 3193 { 3194 struct proc *p; 3195 struct ucred *newcred, *oldcred; 3196 int drflags, error; 3197 3198 sx_assert(&allprison_lock, SX_LOCKED); 3199 KASSERT(prison_isvalid(pr), ("Attaching to invalid prison %p", pr)); 3200 /* 3201 * Note the caller's locking state, but gain and track our own 3202 * references. The caller will see that locks have been 3203 * dropped (which isn't true now, but will be after OSD calls). 3204 */ 3205 prison_hold(pr); 3206 refcount_acquire(&pr->pr_uref); 3207 drflags = PD_DEREF | PD_DEUREF | (*drflagsp & PD_LOCK_FLAGS); 3208 *drflagsp &= PD_OP_FLAGS; 3209 3210 /* Let modules do whatever they need to prepare for attaching. */ 3211 if (drflags & PD_LOCKED) { 3212 mtx_unlock(&pr->pr_mtx); 3213 drflags &= ~PD_LOCKED; 3214 } 3215 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 3216 if (error) 3217 goto e_revert_osd; 3218 sx_unlock(&allprison_lock); 3219 drflags &= ~(PD_LIST_SLOCKED | PD_LIST_XLOCKED); 3220 3221 /* 3222 * Reparent the newly attached process to this jail. 3223 */ 3224 p = td->td_proc; 3225 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 3226 if (error) 3227 goto e_revert_osd; 3228 3229 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 3230 if ((error = change_dir(pr->pr_root, td)) != 0) 3231 goto e_unlock; 3232 #ifdef MAC 3233 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 3234 goto e_unlock; 3235 #endif 3236 VOP_UNLOCK(pr->pr_root); 3237 if ((error = pwd_chroot_chdir(td, pr->pr_root))) 3238 goto e_revert_osd; 3239 3240 newcred = crget(); 3241 PROC_LOCK(p); 3242 oldcred = crcopysafe(p, newcred); 3243 newcred->cr_prison = pr; 3244 #ifdef RACCT 3245 racct_proc_ucred_changed(p, oldcred, newcred); 3246 #endif 3247 #ifdef RCTL 3248 crhold(newcred); 3249 #endif 3250 /* 3251 * Takes over 'newcred''s reference, so 'newcred' must not be used 3252 * besides this point except on RCTL where we took an additional 3253 * reference above. 3254 */ 3255 proc_set_cred(p, newcred); 3256 setsugid(p); 3257 PROC_UNLOCK(p); 3258 #ifdef RCTL 3259 rctl_proc_ucred_changed(p, newcred); 3260 crfree(newcred); 3261 #endif 3262 prison_proc_relink(oldcred->cr_prison, pr, p); 3263 prison_deref(oldcred->cr_prison, drflags); 3264 crfree(oldcred); 3265 prison_knote(pr, NOTE_JAIL_ATTACH | td->td_proc->p_pid); 3266 #ifdef MAC 3267 /* 3268 * Note that mac_prison_attached() assumes that it's called in a 3269 * sleepable context. 3270 */ 3271 mac_prison_attached(td->td_ucred, pr, td->td_proc); 3272 #endif 3273 3274 /* 3275 * If the prison was killed while changing credentials, die along 3276 * with it. 3277 */ 3278 if (!prison_isalive(pr)) { 3279 PROC_LOCK(p); 3280 kern_psignal(p, SIGKILL); 3281 PROC_UNLOCK(p); 3282 } 3283 3284 return (0); 3285 3286 e_unlock: 3287 VOP_UNLOCK(pr->pr_root); 3288 e_revert_osd: 3289 /* Tell modules this process is still in its old jail after all. */ 3290 if (!(drflags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) { 3291 sx_slock(&allprison_lock); 3292 drflags |= PD_LIST_SLOCKED; 3293 } 3294 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 3295 prison_deref(pr, drflags); 3296 return (error); 3297 } 3298 3299 /* 3300 * Only one thread in a process should try to attach to a jail, or 3301 * they might end up with a process root from one prison, but attached 3302 * to the jail of another. Enforce this by making the process run in 3303 * single-threaded mode for the duration of the system call, which 3304 * also prevents other related calls such as chroot. 3305 */ 3306 static int 3307 prison_attach_thread_single(struct thread *td) 3308 { 3309 struct proc *p; 3310 int error; 3311 3312 error = 0; 3313 p = td->td_proc; 3314 if ((atomic_load_int(&p->p_flag) & P_HADTHREADS) != 0) { 3315 PROC_LOCK(p); 3316 if (thread_single(p, SINGLE_BOUNDARY)) 3317 error = ERESTART; 3318 PROC_UNLOCK(p); 3319 } 3320 return (error); 3321 } 3322 3323 static void 3324 prison_attach_thread_single_end(struct thread *td) 3325 { 3326 struct proc *p; 3327 3328 p = td->td_proc; 3329 if ((atomic_load_int(&p->p_flag) & P_HADTHREADS) != 0) { 3330 PROC_LOCK(p); 3331 thread_single_end(p, SINGLE_BOUNDARY); 3332 PROC_UNLOCK(p); 3333 } 3334 } 3335 3336 /* 3337 * Returns a locked prison instance, or NULL on failure. 3338 */ 3339 struct prison * 3340 prison_find(int prid) 3341 { 3342 struct prison *pr; 3343 3344 sx_assert(&allprison_lock, SX_LOCKED); 3345 TAILQ_FOREACH(pr, &allprison, pr_list) { 3346 if (pr->pr_id < prid) 3347 continue; 3348 if (pr->pr_id > prid) 3349 break; 3350 KASSERT(prison_isvalid(pr), ("Found invalid prison %p", pr)); 3351 mtx_lock(&pr->pr_mtx); 3352 return (pr); 3353 } 3354 return (NULL); 3355 } 3356 3357 /* 3358 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 3359 */ 3360 struct prison * 3361 prison_find_child(struct prison *mypr, int prid) 3362 { 3363 struct prison *pr; 3364 int descend; 3365 3366 sx_assert(&allprison_lock, SX_LOCKED); 3367 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 3368 if (pr->pr_id == prid) { 3369 KASSERT(prison_isvalid(pr), 3370 ("Found invalid prison %p", pr)); 3371 mtx_lock(&pr->pr_mtx); 3372 return (pr); 3373 } 3374 } 3375 return (NULL); 3376 } 3377 3378 /* 3379 * Look for the name relative to mypr. Returns a locked prison or NULL. 3380 */ 3381 struct prison * 3382 prison_find_name(struct prison *mypr, const char *name) 3383 { 3384 struct prison *pr, *deadpr; 3385 size_t mylen; 3386 int descend; 3387 3388 sx_assert(&allprison_lock, SX_LOCKED); 3389 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 3390 deadpr = NULL; 3391 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 3392 if (!strcmp(pr->pr_name + mylen, name)) { 3393 KASSERT(prison_isvalid(pr), 3394 ("Found invalid prison %p", pr)); 3395 if (prison_isalive(pr)) { 3396 mtx_lock(&pr->pr_mtx); 3397 return (pr); 3398 } 3399 deadpr = pr; 3400 } 3401 } 3402 /* There was no valid prison - perhaps there was a dying one. */ 3403 if (deadpr != NULL) 3404 mtx_lock(&deadpr->pr_mtx); 3405 return (deadpr); 3406 } 3407 3408 /* 3409 * See if a prison has the specific flag set. The prison should be locked, 3410 * unless checking for flags that are only set at jail creation (such as 3411 * PR_IP4 and PR_IP6), or only the single bit is examined, without regard 3412 * to any other prison data. 3413 */ 3414 bool 3415 prison_flag(struct ucred *cred, unsigned flag) 3416 { 3417 3418 return ((cred->cr_prison->pr_flags & flag) != 0); 3419 } 3420 3421 /* 3422 * See if a prison has the specific allow flag set. 3423 * The prison *should* be locked, or only a single bit is examined, without 3424 * regard to any other prison data. 3425 */ 3426 bool 3427 prison_allow(struct ucred *cred, unsigned flag) 3428 { 3429 3430 return ((cred->cr_prison->pr_allow & flag) != 0); 3431 } 3432 3433 /* 3434 * Hold a prison reference, by incrementing pr_ref. It is generally 3435 * an error to hold a prison that does not already have a reference. 3436 * A prison record will remain valid as long as it has at least one 3437 * reference, and will not be removed as long as either the prison 3438 * mutex or the allprison lock is held (allprison_lock may be shared). 3439 */ 3440 void 3441 prison_hold_locked(struct prison *pr) 3442 { 3443 3444 /* Locking is no longer required. */ 3445 prison_hold(pr); 3446 } 3447 3448 void 3449 prison_hold(struct prison *pr) 3450 { 3451 u_int old __diagused; 3452 3453 old = refcount_acquire(&pr->pr_ref); 3454 KASSERT(old > 0, 3455 ("cannot hold a non-alive prison (jid=%d)", pr->pr_id)); 3456 } 3457 3458 /* 3459 * Remove a prison reference. If that was the last reference, the 3460 * prison will be removed (at a later time). 3461 */ 3462 void 3463 prison_free_locked(struct prison *pr) 3464 { 3465 3466 mtx_assert(&pr->pr_mtx, MA_OWNED); 3467 /* 3468 * Locking is no longer required, but unlock because the caller 3469 * expects it. 3470 */ 3471 mtx_unlock(&pr->pr_mtx); 3472 prison_free(pr); 3473 } 3474 3475 void 3476 prison_free(struct prison *pr) 3477 { 3478 3479 KASSERT(refcount_load(&pr->pr_ref) > 0, 3480 ("Trying to free dead prison %p (jid=%d).", 3481 pr, pr->pr_id)); 3482 if (!refcount_release_if_not_last(&pr->pr_ref)) { 3483 /* 3484 * Don't remove the last reference in this context, 3485 * in case there are locks held. 3486 */ 3487 taskqueue_enqueue(taskqueue_jail_remove, &pr->pr_task); 3488 } 3489 } 3490 3491 static void 3492 prison_free_not_last(struct prison *pr) 3493 { 3494 bool released __diagused; 3495 3496 released = refcount_release(&pr->pr_ref); 3497 KASSERT(!released, 3498 ("prison_free_not_last freed last ref on prison %p (jid=%d).", 3499 pr, pr->pr_id)); 3500 } 3501 3502 /* 3503 * Hold a prison for user visibility, by incrementing pr_uref. 3504 * It is generally an error to hold a prison that isn't already 3505 * user-visible, except through the jail system calls. It is also 3506 * an error to hold an invalid prison. A prison record will remain 3507 * alive as long as it has at least one user reference, and will not 3508 * be set to the dying state until the prison mutex and allprison_lock 3509 * are both freed. 3510 */ 3511 void 3512 prison_proc_hold(struct prison *pr) 3513 { 3514 u_int old __diagused; 3515 3516 old = refcount_acquire(&pr->pr_uref); 3517 KASSERT(old > 0, 3518 ("cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 3519 } 3520 3521 /* 3522 * Remove a prison user reference. If it was the last reference, the 3523 * prison will be considered "dying", and may be removed once all of 3524 * its references are dropped. 3525 */ 3526 void 3527 prison_proc_free(struct prison *pr) 3528 { 3529 3530 /* 3531 * Locking is only required when releasing the last reference. 3532 * This allows assurance that a locked prison will remain alive 3533 * until it is unlocked. 3534 */ 3535 if (!refcount_release_if_not_last(&pr->pr_uref)) { 3536 /* 3537 * Don't remove the last user reference in this context, 3538 * which is expected to be a process that is not only locked, 3539 * but also half dead. Add a reference so any calls to 3540 * prison_free() won't re-submit the task. 3541 */ 3542 prison_hold(pr); 3543 mtx_lock(&pr->pr_mtx); 3544 KASSERT(!(pr->pr_flags & PR_COMPLETE_PROC), 3545 ("Redundant last reference in prison_proc_free (jid=%d)", 3546 pr->pr_id)); 3547 pr->pr_flags |= PR_COMPLETE_PROC; 3548 mtx_unlock(&pr->pr_mtx); 3549 taskqueue_enqueue(taskqueue_jail_remove, &pr->pr_task); 3550 } 3551 } 3552 3553 static void 3554 prison_proc_free_not_last(struct prison *pr) 3555 { 3556 #ifdef INVARIANTS 3557 int lastref; 3558 3559 KASSERT(refcount_load(&pr->pr_uref) > 0, 3560 ("Trying to free dead prison %p (jid=%d).", 3561 pr, pr->pr_id)); 3562 lastref = refcount_release(&pr->pr_uref); 3563 KASSERT(!lastref, 3564 ("prison_proc_free_not_last freed last uref on prison %p (jid=%d).", 3565 pr, pr->pr_id)); 3566 #else 3567 refcount_release(&pr->pr_uref); 3568 #endif 3569 } 3570 3571 void 3572 prison_proc_link(struct prison *pr, struct proc *p) 3573 { 3574 3575 sx_assert(&allproc_lock, SA_XLOCKED); 3576 LIST_INSERT_HEAD(&pr->pr_proclist, p, p_jaillist); 3577 } 3578 3579 void 3580 prison_proc_unlink(struct prison *pr, struct proc *p) 3581 { 3582 3583 sx_assert(&allproc_lock, SA_XLOCKED); 3584 LIST_REMOVE(p, p_jaillist); 3585 } 3586 3587 static void 3588 prison_proc_relink(struct prison *opr, struct prison *npr, struct proc *p) 3589 { 3590 3591 sx_xlock(&allproc_lock); 3592 prison_proc_unlink(opr, p); 3593 prison_proc_link(npr, p); 3594 sx_xunlock(&allproc_lock); 3595 } 3596 3597 /* 3598 * Complete a call to either prison_free or prison_proc_free. 3599 */ 3600 static void 3601 prison_complete(void *context, int pending) 3602 { 3603 struct prison *pr = context; 3604 int drflags; 3605 3606 /* 3607 * This could be called to release the last reference, or the last 3608 * user reference (plus the reference held in prison_proc_free). 3609 */ 3610 drflags = prison_lock_xlock(pr, PD_DEREF); 3611 if (pr->pr_flags & PR_COMPLETE_PROC) { 3612 pr->pr_flags &= ~PR_COMPLETE_PROC; 3613 drflags |= PD_DEUREF; 3614 } 3615 prison_deref(pr, drflags); 3616 } 3617 3618 static void 3619 prison_kill_processes_cb(struct proc *p, void *arg __unused) 3620 { 3621 3622 kern_psignal(p, SIGKILL); 3623 } 3624 3625 /* 3626 * Note the iteration does not guarantee acting on all processes. 3627 * Most notably there may be fork or jail_attach in progress. 3628 */ 3629 void 3630 prison_proc_iterate(struct prison *pr, void (*cb)(struct proc *, void *), 3631 void *cbarg) 3632 { 3633 struct prison *ppr; 3634 struct proc *p; 3635 3636 if (atomic_load_int(&pr->pr_childcount) == 0) { 3637 sx_slock(&allproc_lock); 3638 LIST_FOREACH(p, &pr->pr_proclist, p_jaillist) { 3639 if (p->p_state == PRS_NEW) 3640 continue; 3641 PROC_LOCK(p); 3642 cb(p, cbarg); 3643 PROC_UNLOCK(p); 3644 } 3645 sx_sunlock(&allproc_lock); 3646 if (atomic_load_int(&pr->pr_childcount) == 0) 3647 return; 3648 /* 3649 * Some jails popped up during the iteration, fall through to a 3650 * system-wide search. 3651 */ 3652 } 3653 3654 sx_slock(&allproc_lock); 3655 FOREACH_PROC_IN_SYSTEM(p) { 3656 PROC_LOCK(p); 3657 if (p->p_state != PRS_NEW && p->p_ucred != NULL) { 3658 for (ppr = p->p_ucred->cr_prison; ppr != NULL; 3659 ppr = ppr->pr_parent) { 3660 if (ppr == pr) { 3661 cb(p, cbarg); 3662 break; 3663 } 3664 } 3665 } 3666 PROC_UNLOCK(p); 3667 } 3668 sx_sunlock(&allproc_lock); 3669 } 3670 3671 /* 3672 * Remove a prison reference and/or user reference (usually). 3673 * This assumes context that allows sleeping (for allprison_lock), 3674 * with no non-sleeping locks held, except perhaps the prison itself. 3675 * If there are no more references, release and delist the prison. 3676 * On completion, the prison lock and the allprison lock are both 3677 * unlocked. 3678 */ 3679 static void 3680 prison_deref(struct prison *pr, int flags) 3681 { 3682 struct prisonlist freeprison; 3683 struct prison *killpr, *rpr, *ppr, *tpr; 3684 3685 killpr = NULL; 3686 TAILQ_INIT(&freeprison); 3687 /* 3688 * Release this prison as requested, which may cause its parent 3689 * to be released, and then maybe its grandparent, etc. 3690 */ 3691 for (;;) { 3692 if (flags & PD_KILL) { 3693 /* Kill the prison and its descendents. */ 3694 KASSERT(pr != &prison0, 3695 ("prison_deref trying to kill prison0")); 3696 if (!prison_isalive(pr)) { 3697 /* Silently ignore already-dying prisons. */ 3698 flags &= ~PD_KILL; 3699 } else { 3700 if (!(flags & PD_DEREF)) { 3701 prison_hold(pr); 3702 flags |= PD_DEREF; 3703 } 3704 flags = prison_lock_xlock(pr, flags); 3705 prison_deref_kill(pr, &freeprison); 3706 } 3707 } 3708 if (flags & PD_DEUREF) { 3709 /* Drop a user reference. */ 3710 KASSERT(refcount_load(&pr->pr_uref) > 0, 3711 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 3712 pr->pr_id)); 3713 if (!refcount_release_if_not_last(&pr->pr_uref)) { 3714 if (!(flags & PD_DEREF)) { 3715 prison_hold(pr); 3716 flags |= PD_DEREF; 3717 } 3718 flags = prison_lock_xlock(pr, flags); 3719 if (refcount_release(&pr->pr_uref) && 3720 pr->pr_state == PRISON_STATE_ALIVE) { 3721 /* 3722 * When the last user references goes, 3723 * this becomes a dying prison. 3724 */ 3725 KASSERT( 3726 refcount_load(&prison0.pr_uref) > 0, 3727 ("prison0 pr_uref=0")); 3728 pr->pr_state = PRISON_STATE_DYING; 3729 prison_cleanup_locked(pr); 3730 mtx_unlock(&pr->pr_mtx); 3731 flags &= ~PD_LOCKED; 3732 prison_cleanup_unlocked(pr); 3733 } 3734 } 3735 } 3736 if (flags & PD_KILL) { 3737 /* 3738 * Any remaining user references are probably processes 3739 * that need to be killed, either in this prison or its 3740 * descendants. 3741 */ 3742 if (refcount_load(&pr->pr_uref) > 0) { 3743 killpr = pr; 3744 flags &= ~PD_DEREF; 3745 } 3746 /* Make sure the parent prison doesn't get killed. */ 3747 flags &= ~PD_KILL; 3748 } 3749 if (flags & PD_DEREF) { 3750 /* Drop a reference. */ 3751 KASSERT(refcount_load(&pr->pr_ref) > 0, 3752 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 3753 pr->pr_id)); 3754 if (!refcount_release_if_not_last(&pr->pr_ref)) { 3755 flags = prison_lock_xlock(pr, flags); 3756 if (refcount_release(&pr->pr_ref)) { 3757 /* 3758 * When the last reference goes, 3759 * unlink the prison and set it aside. 3760 */ 3761 KASSERT( 3762 refcount_load(&pr->pr_uref) == 0, 3763 ("prison_deref: last ref, " 3764 "but still has %d urefs (jid=%d)", 3765 pr->pr_uref, pr->pr_id)); 3766 KASSERT( 3767 refcount_load(&prison0.pr_ref) != 0, 3768 ("prison0 pr_ref=0")); 3769 #ifdef MAC 3770 /* 3771 * The MAC framework will call into any 3772 * policies that want to hook 3773 * prison_destroy_label, so ideally we 3774 * call this prior to any final state 3775 * invalidation to be safe. 3776 */ 3777 mac_prison_destroy(pr); 3778 #endif 3779 pr->pr_state = PRISON_STATE_INVALID; 3780 TAILQ_REMOVE(&allprison, pr, pr_list); 3781 LIST_REMOVE(pr, pr_sibling); 3782 TAILQ_INSERT_TAIL(&freeprison, pr, 3783 pr_list); 3784 for (ppr = pr->pr_parent; 3785 ppr != NULL; 3786 ppr = ppr->pr_parent) 3787 ppr->pr_childcount--; 3788 /* 3789 * Removing a prison frees references 3790 * from its parent. 3791 */ 3792 ppr = pr->pr_parent; 3793 pr->pr_parent = NULL; 3794 mtx_unlock(&pr->pr_mtx); 3795 3796 pr = ppr; 3797 flags &= ~PD_LOCKED; 3798 flags |= PD_DEREF | PD_DEUREF; 3799 continue; 3800 } 3801 } 3802 } 3803 break; 3804 } 3805 3806 /* Release all the prison locks. */ 3807 if (flags & PD_LOCKED) 3808 mtx_unlock(&pr->pr_mtx); 3809 if (flags & PD_LIST_SLOCKED) 3810 sx_sunlock(&allprison_lock); 3811 else if (flags & PD_LIST_XLOCKED) 3812 sx_xunlock(&allprison_lock); 3813 3814 /* Kill any processes attached to a killed prison. */ 3815 if (killpr != NULL) { 3816 prison_proc_iterate(killpr, prison_kill_processes_cb, NULL); 3817 prison_free(killpr); 3818 } 3819 3820 /* 3821 * Finish removing any unreferenced prisons, which couldn't happen 3822 * while allprison_lock was held (to avoid a LOR on vrele). 3823 */ 3824 TAILQ_FOREACH_SAFE(rpr, &freeprison, pr_list, tpr) { 3825 #ifdef VIMAGE 3826 if (rpr->pr_flags & PR_VNET) 3827 vnet_destroy(rpr->pr_vnet); 3828 #endif 3829 if (rpr->pr_root != NULL) 3830 vrele(rpr->pr_root); 3831 mtx_destroy(&rpr->pr_mtx); 3832 #ifdef INET 3833 prison_ip_free(rpr->pr_addrs[PR_INET]); 3834 #endif 3835 #ifdef INET6 3836 prison_ip_free(rpr->pr_addrs[PR_INET6]); 3837 #endif 3838 if (rpr->pr_cpuset != NULL) 3839 cpuset_rel(rpr->pr_cpuset); 3840 osd_jail_exit(rpr); 3841 #ifdef RACCT 3842 if (racct_enable) 3843 prison_racct_detach(rpr); 3844 #endif 3845 TAILQ_REMOVE(&freeprison, rpr, pr_list); 3846 free(rpr, M_PRISON); 3847 } 3848 } 3849 3850 /* 3851 * Kill the prison and its descendants. Mark them as dying, clear the 3852 * persist flag, and call module remove methods. 3853 */ 3854 static void 3855 prison_deref_kill(struct prison *pr, struct prisonlist *freeprison) 3856 { 3857 struct prison *cpr, *ppr, *rpr; 3858 bool descend; 3859 3860 /* 3861 * Unlike the descendants, the target prison can be killed 3862 * even if it is currently dying. This is useful for failed 3863 * creation in jail_set(2). 3864 */ 3865 KASSERT(refcount_load(&pr->pr_ref) > 0, 3866 ("Trying to kill dead prison %p (jid=%d).", 3867 pr, pr->pr_id)); 3868 refcount_acquire(&pr->pr_uref); 3869 pr->pr_state = PRISON_STATE_DYING; 3870 mtx_unlock(&pr->pr_mtx); 3871 3872 rpr = NULL; 3873 FOREACH_PRISON_DESCENDANT_PRE_POST(pr, cpr, descend) { 3874 if (descend) { 3875 if (!prison_isalive(cpr)) { 3876 descend = false; 3877 continue; 3878 } 3879 prison_hold(cpr); 3880 prison_proc_hold(cpr); 3881 mtx_lock(&cpr->pr_mtx); 3882 cpr->pr_state = PRISON_STATE_DYING; 3883 cpr->pr_flags |= PR_REMOVE; 3884 mtx_unlock(&cpr->pr_mtx); 3885 continue; 3886 } 3887 if (!(cpr->pr_flags & PR_REMOVE)) 3888 continue; 3889 prison_cleanup_unlocked(cpr); 3890 mtx_lock(&cpr->pr_mtx); 3891 prison_cleanup_locked(cpr); 3892 cpr->pr_flags &= ~PR_REMOVE; 3893 if (cpr->pr_flags & PR_PERSIST) { 3894 cpr->pr_flags &= ~PR_PERSIST; 3895 prison_proc_free_not_last(cpr); 3896 prison_free_not_last(cpr); 3897 } 3898 (void)refcount_release(&cpr->pr_uref); 3899 if (refcount_release(&cpr->pr_ref)) { 3900 /* 3901 * When the last reference goes, unlink the prison 3902 * and set it aside for prison_deref() to handle. 3903 * Delay unlinking the sibling list to keep the loop 3904 * safe. 3905 */ 3906 if (rpr != NULL) 3907 LIST_REMOVE(rpr, pr_sibling); 3908 rpr = cpr; 3909 rpr->pr_state = PRISON_STATE_INVALID; 3910 TAILQ_REMOVE(&allprison, rpr, pr_list); 3911 TAILQ_INSERT_TAIL(freeprison, rpr, pr_list); 3912 /* 3913 * Removing a prison frees references from its parent. 3914 */ 3915 ppr = rpr->pr_parent; 3916 prison_proc_free_not_last(ppr); 3917 prison_free_not_last(ppr); 3918 for (; ppr != NULL; ppr = ppr->pr_parent) 3919 ppr->pr_childcount--; 3920 } 3921 mtx_unlock(&cpr->pr_mtx); 3922 } 3923 if (rpr != NULL) 3924 LIST_REMOVE(rpr, pr_sibling); 3925 3926 prison_cleanup_unlocked(pr); 3927 mtx_lock(&pr->pr_mtx); 3928 prison_cleanup_locked(pr); 3929 if (pr->pr_flags & PR_PERSIST) { 3930 pr->pr_flags &= ~PR_PERSIST; 3931 prison_proc_free_not_last(pr); 3932 prison_free_not_last(pr); 3933 } 3934 (void)refcount_release(&pr->pr_uref); 3935 } 3936 3937 /* 3938 * Given the current locking state in the flags, make sure allprison_lock 3939 * is held exclusive, and the prison is locked. Return flags indicating 3940 * the new state. 3941 */ 3942 static int 3943 prison_lock_xlock(struct prison *pr, int flags) 3944 { 3945 3946 if (!(flags & PD_LIST_XLOCKED)) { 3947 /* 3948 * Get allprison_lock, which may be an upgrade, 3949 * and may require unlocking the prison. 3950 */ 3951 if (flags & PD_LOCKED) { 3952 mtx_unlock(&pr->pr_mtx); 3953 flags &= ~PD_LOCKED; 3954 } 3955 if (flags & PD_LIST_SLOCKED) { 3956 if (!sx_try_upgrade(&allprison_lock)) { 3957 sx_sunlock(&allprison_lock); 3958 sx_xlock(&allprison_lock); 3959 } 3960 flags &= ~PD_LIST_SLOCKED; 3961 } else 3962 sx_xlock(&allprison_lock); 3963 flags |= PD_LIST_XLOCKED; 3964 } 3965 if (!(flags & PD_LOCKED)) { 3966 /* Lock the prison mutex. */ 3967 mtx_lock(&pr->pr_mtx); 3968 flags |= PD_LOCKED; 3969 } 3970 return flags; 3971 } 3972 3973 /* 3974 * Release a prison's resources when it starts dying (when the last user 3975 * reference is dropped, or when it is killed). Two functions are called, 3976 * for work that requires a locked prison or an unlocked one. 3977 */ 3978 static void 3979 prison_cleanup_locked(struct prison *pr) 3980 { 3981 sx_assert(&allprison_lock, SA_XLOCKED); 3982 mtx_assert(&pr->pr_mtx, MA_OWNED); 3983 prison_knote(pr, NOTE_JAIL_REMOVE); 3984 knlist_detach(pr->pr_klist); 3985 jaildesc_prison_cleanup(pr); 3986 pr->pr_klist = NULL; 3987 } 3988 3989 static void 3990 prison_cleanup_unlocked(struct prison *pr) 3991 { 3992 sx_assert(&allprison_lock, SA_XLOCKED); 3993 mtx_assert(&pr->pr_mtx, MA_NOTOWNED); 3994 vfs_exjail_delete(pr); 3995 shm_remove_prison(pr); 3996 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 3997 } 3998 3999 /* 4000 * Set or clear a permission bit in the pr_allow field, passing restrictions 4001 * (cleared permission) down to child jails. 4002 */ 4003 void 4004 prison_set_allow(struct ucred *cred, unsigned flag, int enable) 4005 { 4006 struct prison *pr; 4007 4008 pr = cred->cr_prison; 4009 sx_slock(&allprison_lock); 4010 mtx_lock(&pr->pr_mtx); 4011 prison_set_allow_locked(pr, flag, enable); 4012 mtx_unlock(&pr->pr_mtx); 4013 sx_sunlock(&allprison_lock); 4014 } 4015 4016 static void 4017 prison_set_allow_locked(struct prison *pr, unsigned flag, int enable) 4018 { 4019 struct prison *cpr; 4020 int descend; 4021 4022 if (enable != 0) 4023 pr->pr_allow |= flag; 4024 else { 4025 pr->pr_allow &= ~flag; 4026 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 4027 cpr->pr_allow &= ~flag; 4028 } 4029 } 4030 4031 /* 4032 * Check if a jail supports the given address family. 4033 * 4034 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 4035 * if not. 4036 */ 4037 int 4038 prison_check_af(struct ucred *cred, int af) 4039 { 4040 struct prison *pr; 4041 int error; 4042 4043 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 4044 4045 pr = cred->cr_prison; 4046 #ifdef VIMAGE 4047 /* Prisons with their own network stack are not limited. */ 4048 if (prison_owns_vnet(pr)) 4049 return (0); 4050 #endif 4051 4052 error = 0; 4053 switch (af) 4054 { 4055 #ifdef INET 4056 case AF_INET: 4057 if (pr->pr_flags & PR_IP4) 4058 { 4059 mtx_lock(&pr->pr_mtx); 4060 if ((pr->pr_flags & PR_IP4) && 4061 pr->pr_addrs[PR_INET] == NULL) 4062 error = EAFNOSUPPORT; 4063 mtx_unlock(&pr->pr_mtx); 4064 } 4065 break; 4066 #endif 4067 #ifdef INET6 4068 case AF_INET6: 4069 if (pr->pr_flags & PR_IP6) 4070 { 4071 mtx_lock(&pr->pr_mtx); 4072 if ((pr->pr_flags & PR_IP6) && 4073 pr->pr_addrs[PR_INET6] == NULL) 4074 error = EAFNOSUPPORT; 4075 mtx_unlock(&pr->pr_mtx); 4076 } 4077 break; 4078 #endif 4079 case AF_LOCAL: 4080 case AF_ROUTE: 4081 case AF_NETLINK: 4082 break; 4083 default: 4084 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 4085 error = EAFNOSUPPORT; 4086 } 4087 return (error); 4088 } 4089 4090 /* 4091 * Check if given address belongs to the jail referenced by cred (wrapper to 4092 * prison_check_ip[46]). 4093 * 4094 * Returns 0 if jail doesn't restrict the address family or if address belongs 4095 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 4096 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 4097 */ 4098 int 4099 prison_if(struct ucred *cred, const struct sockaddr *sa) 4100 { 4101 #ifdef INET 4102 const struct sockaddr_in *sai; 4103 #endif 4104 #ifdef INET6 4105 const struct sockaddr_in6 *sai6; 4106 #endif 4107 int error; 4108 4109 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 4110 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 4111 4112 #ifdef VIMAGE 4113 if (prison_owns_vnet(cred->cr_prison)) 4114 return (0); 4115 #endif 4116 4117 error = 0; 4118 switch (sa->sa_family) 4119 { 4120 #ifdef INET 4121 case AF_INET: 4122 sai = (const struct sockaddr_in *)sa; 4123 error = prison_check_ip4(cred, &sai->sin_addr); 4124 break; 4125 #endif 4126 #ifdef INET6 4127 case AF_INET6: 4128 sai6 = (const struct sockaddr_in6 *)sa; 4129 error = prison_check_ip6(cred, &sai6->sin6_addr); 4130 break; 4131 #endif 4132 default: 4133 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 4134 error = EAFNOSUPPORT; 4135 } 4136 return (error); 4137 } 4138 4139 /* 4140 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 4141 */ 4142 int 4143 prison_check(struct ucred *cred1, struct ucred *cred2) 4144 { 4145 4146 return ((cred1->cr_prison == cred2->cr_prison || 4147 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 4148 } 4149 4150 /* 4151 * For mountd/nfsd to run within a prison, it must be: 4152 * - A vnet prison. 4153 * - PR_ALLOW_NFSD must be set on it. 4154 * - The root directory (pr_root) of the prison must be 4155 * a file system mount point, so the mountd can hang 4156 * export information on it. 4157 * - The prison's enforce_statfs cannot be 0, so that 4158 * mountd(8) can do exports. 4159 */ 4160 bool 4161 prison_check_nfsd(struct ucred *cred) 4162 { 4163 4164 if (jailed_without_vnet(cred)) 4165 return (false); 4166 if (!prison_allow(cred, PR_ALLOW_NFSD)) 4167 return (false); 4168 if ((cred->cr_prison->pr_root->v_vflag & VV_ROOT) == 0) 4169 return (false); 4170 if (cred->cr_prison->pr_enforce_statfs == 0) 4171 return (false); 4172 return (true); 4173 } 4174 4175 /* 4176 * Return true if p2 is a child of p1, otherwise false. 4177 */ 4178 bool 4179 prison_ischild(struct prison *pr1, struct prison *pr2) 4180 { 4181 4182 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 4183 if (pr1 == pr2) 4184 return (true); 4185 return (false); 4186 } 4187 4188 /* 4189 * Return true if the prison is currently alive. A prison is alive if it 4190 * holds user references and it isn't being removed. 4191 */ 4192 bool 4193 prison_isalive(const struct prison *pr) 4194 { 4195 4196 if (__predict_false(pr->pr_state != PRISON_STATE_ALIVE)) 4197 return (false); 4198 return (true); 4199 } 4200 4201 /* 4202 * Return true if the prison is currently valid. A prison is valid if it has 4203 * been fully created, and is not being destroyed. Note that dying prisons 4204 * are still considered valid. Invalid prisons won't be found under normal 4205 * circumstances, as they're only put in that state by functions that have 4206 * an exclusive hold on allprison_lock. 4207 */ 4208 bool 4209 prison_isvalid(struct prison *pr) 4210 { 4211 4212 if (__predict_false(pr->pr_state == PRISON_STATE_INVALID)) 4213 return (false); 4214 if (__predict_false(refcount_load(&pr->pr_ref) == 0)) 4215 return (false); 4216 return (true); 4217 } 4218 4219 /* 4220 * Return true if the passed credential is in a jail and that jail does not 4221 * have its own virtual network stack, otherwise false. 4222 */ 4223 bool 4224 jailed_without_vnet(struct ucred *cred) 4225 { 4226 4227 if (!jailed(cred)) 4228 return (false); 4229 #ifdef VIMAGE 4230 if (prison_owns_vnet(cred->cr_prison)) 4231 return (false); 4232 #endif 4233 4234 return (true); 4235 } 4236 4237 /* 4238 * Return the correct hostname (domainname, et al) for the passed credential. 4239 */ 4240 void 4241 getcredhostname(struct ucred *cred, char *buf, size_t size) 4242 { 4243 struct prison *pr; 4244 4245 /* 4246 * A NULL credential can be used to shortcut to the physical 4247 * system's hostname. 4248 */ 4249 pr = (cred != NULL) ? cred->cr_prison : &prison0; 4250 mtx_lock(&pr->pr_mtx); 4251 strlcpy(buf, pr->pr_hostname, size); 4252 mtx_unlock(&pr->pr_mtx); 4253 } 4254 4255 void 4256 getcreddomainname(struct ucred *cred, char *buf, size_t size) 4257 { 4258 4259 mtx_lock(&cred->cr_prison->pr_mtx); 4260 strlcpy(buf, cred->cr_prison->pr_domainname, size); 4261 mtx_unlock(&cred->cr_prison->pr_mtx); 4262 } 4263 4264 void 4265 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 4266 { 4267 4268 mtx_lock(&cred->cr_prison->pr_mtx); 4269 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 4270 mtx_unlock(&cred->cr_prison->pr_mtx); 4271 } 4272 4273 void 4274 getcredhostid(struct ucred *cred, unsigned long *hostid) 4275 { 4276 4277 mtx_lock(&cred->cr_prison->pr_mtx); 4278 *hostid = cred->cr_prison->pr_hostid; 4279 mtx_unlock(&cred->cr_prison->pr_mtx); 4280 } 4281 4282 void 4283 getjailname(struct ucred *cred, char *name, size_t len) 4284 { 4285 4286 mtx_lock(&cred->cr_prison->pr_mtx); 4287 strlcpy(name, cred->cr_prison->pr_name, len); 4288 mtx_unlock(&cred->cr_prison->pr_mtx); 4289 } 4290 4291 #ifdef VIMAGE 4292 /* 4293 * Determine whether the prison owns its VNET. 4294 */ 4295 bool 4296 prison_owns_vnet(struct prison *pr) 4297 { 4298 4299 /* 4300 * vnets cannot be added/removed after jail creation, 4301 * so no need to lock here. 4302 */ 4303 return ((pr->pr_flags & PR_VNET) != 0); 4304 } 4305 #endif 4306 4307 /* 4308 * Determine whether the subject represented by cred can "see" 4309 * status of a mount point. 4310 * Returns: 0 for permitted, ENOENT otherwise. 4311 * XXX: This function should be called cr_canseemount() and should be 4312 * placed in kern_prot.c. 4313 */ 4314 int 4315 prison_canseemount(struct ucred *cred, struct mount *mp) 4316 { 4317 struct prison *pr; 4318 struct statfs *sp; 4319 size_t len; 4320 4321 pr = cred->cr_prison; 4322 if (pr->pr_enforce_statfs == 0) 4323 return (0); 4324 if (pr->pr_root->v_mount == mp) 4325 return (0); 4326 if (pr->pr_enforce_statfs == 2) 4327 return (ENOENT); 4328 /* 4329 * If jail's chroot directory is set to "/" we should be able to see 4330 * all mount-points from inside a jail. 4331 * This is ugly check, but this is the only situation when jail's 4332 * directory ends with '/'. 4333 */ 4334 if (strcmp(pr->pr_path, "/") == 0) 4335 return (0); 4336 len = strlen(pr->pr_path); 4337 sp = &mp->mnt_stat; 4338 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 4339 return (ENOENT); 4340 /* 4341 * Be sure that we don't have situation where jail's root directory 4342 * is "/some/path" and mount point is "/some/pathpath". 4343 */ 4344 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 4345 return (ENOENT); 4346 return (0); 4347 } 4348 4349 void 4350 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 4351 { 4352 char jpath[MAXPATHLEN]; 4353 struct prison *pr; 4354 size_t len; 4355 4356 pr = cred->cr_prison; 4357 if (pr->pr_enforce_statfs == 0) 4358 return; 4359 if (prison_canseemount(cred, mp) != 0) { 4360 bzero(&sp->f_fsid, sizeof(sp->f_fsid)); 4361 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 4362 strlcpy(sp->f_mntonname, "[restricted]", 4363 sizeof(sp->f_mntonname)); 4364 return; 4365 } 4366 if (pr->pr_enforce_statfs > 1) 4367 bzero(&sp->f_fsid, sizeof(sp->f_fsid)); 4368 if (pr->pr_root->v_mount == mp) { 4369 /* 4370 * Clear current buffer data, so we are sure nothing from 4371 * the valid path left there. 4372 */ 4373 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 4374 *sp->f_mntonname = '/'; 4375 return; 4376 } 4377 /* 4378 * If jail's chroot directory is set to "/" we should be able to see 4379 * all mount-points from inside a jail. 4380 */ 4381 if (strcmp(pr->pr_path, "/") == 0) 4382 return; 4383 len = strlen(pr->pr_path); 4384 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 4385 /* 4386 * Clear current buffer data, so we are sure nothing from 4387 * the valid path left there. 4388 */ 4389 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 4390 if (*jpath == '\0') { 4391 /* Should never happen. */ 4392 *sp->f_mntonname = '/'; 4393 } else { 4394 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 4395 } 4396 } 4397 4398 /* 4399 * Check with permission for a specific privilege is granted within jail. We 4400 * have a specific list of accepted privileges; the rest are denied. 4401 */ 4402 int 4403 prison_priv_check(struct ucred *cred, int priv) 4404 { 4405 struct prison *pr; 4406 int error; 4407 4408 /* 4409 * Some policies have custom handlers. This routine should not be 4410 * called for them. See priv_check_cred(). 4411 */ 4412 switch (priv) { 4413 case PRIV_VFS_LOOKUP: 4414 case PRIV_VFS_GENERATION: 4415 KASSERT(0, ("prison_priv_check instead of a custom handler " 4416 "called for %d\n", priv)); 4417 } 4418 4419 if (!jailed(cred)) 4420 return (0); 4421 4422 #ifdef VIMAGE 4423 /* 4424 * Privileges specific to prisons with a virtual network stack. 4425 * There might be a duplicate entry here in case the privilege 4426 * is only granted conditionally in the legacy jail case. 4427 */ 4428 switch (priv) { 4429 /* 4430 * NFS-specific privileges. 4431 */ 4432 case PRIV_NFS_DAEMON: 4433 case PRIV_VFS_GETFH: 4434 case PRIV_VFS_MOUNT_EXPORTED: 4435 if (!prison_check_nfsd(cred)) 4436 return (EPERM); 4437 #ifdef notyet 4438 case PRIV_NFS_LOCKD: 4439 #endif 4440 /* 4441 * Network stack privileges. 4442 */ 4443 case PRIV_NET_BRIDGE: 4444 case PRIV_NET_GRE: 4445 case PRIV_NET_BPF: 4446 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 4447 case PRIV_NET_ROUTE: 4448 case PRIV_NET_TAP: 4449 case PRIV_NET_SETIFMTU: 4450 case PRIV_NET_SETIFFLAGS: 4451 case PRIV_NET_SETIFCAP: 4452 case PRIV_NET_SETIFDESCR: 4453 case PRIV_NET_SETIFNAME : 4454 case PRIV_NET_SETIFMETRIC: 4455 case PRIV_NET_SETIFPHYS: 4456 case PRIV_NET_SETIFMAC: 4457 case PRIV_NET_SETLANPCP: 4458 case PRIV_NET_ADDMULTI: 4459 case PRIV_NET_DELMULTI: 4460 case PRIV_NET_HWIOCTL: 4461 case PRIV_NET_SETLLADDR: 4462 case PRIV_NET_ADDIFGROUP: 4463 case PRIV_NET_DELIFGROUP: 4464 case PRIV_NET_IFCREATE: 4465 case PRIV_NET_IFDESTROY: 4466 case PRIV_NET_ADDIFADDR: 4467 case PRIV_NET_DELIFADDR: 4468 case PRIV_NET_LAGG: 4469 case PRIV_NET_GIF: 4470 case PRIV_NET_SETIFVNET: 4471 case PRIV_NET_SETIFFIB: 4472 case PRIV_NET_OVPN: 4473 case PRIV_NET_GENEVE: 4474 case PRIV_NET_ME: 4475 case PRIV_NET_WG: 4476 4477 /* 4478 * 802.11-related privileges. 4479 */ 4480 case PRIV_NET80211_VAP_GETKEY: 4481 case PRIV_NET80211_VAP_MANAGE: 4482 4483 #ifdef notyet 4484 /* 4485 * ATM privileges. 4486 */ 4487 case PRIV_NETATM_CFG: 4488 case PRIV_NETATM_ADD: 4489 case PRIV_NETATM_DEL: 4490 case PRIV_NETATM_SET: 4491 4492 /* 4493 * Bluetooth privileges. 4494 */ 4495 case PRIV_NETBLUETOOTH_RAW: 4496 #endif 4497 4498 /* 4499 * Netgraph and netgraph module privileges. 4500 */ 4501 case PRIV_NETGRAPH_CONTROL: 4502 #ifdef notyet 4503 case PRIV_NETGRAPH_TTY: 4504 #endif 4505 4506 /* 4507 * IPv4 and IPv6 privileges. 4508 */ 4509 case PRIV_NETINET_IPFW: 4510 case PRIV_NETINET_DIVERT: 4511 case PRIV_NETINET_PF: 4512 case PRIV_NETINET_DUMMYNET: 4513 case PRIV_NETINET_CARP: 4514 case PRIV_NETINET_MROUTE: 4515 case PRIV_NETINET_RAW: 4516 case PRIV_NETINET_ADDRCTRL6: 4517 case PRIV_NETINET_ND6: 4518 case PRIV_NETINET_SCOPE6: 4519 case PRIV_NETINET_ALIFETIME6: 4520 case PRIV_NETINET_IPSEC: 4521 case PRIV_NETINET_BINDANY: 4522 4523 #ifdef notyet 4524 /* 4525 * NCP privileges. 4526 */ 4527 case PRIV_NETNCP: 4528 4529 /* 4530 * SMB privileges. 4531 */ 4532 case PRIV_NETSMB: 4533 #endif 4534 4535 /* 4536 * No default: or deny here. 4537 * In case of no permit fall through to next switch(). 4538 */ 4539 if (cred->cr_prison->pr_flags & PR_VNET) 4540 return (0); 4541 } 4542 #endif /* VIMAGE */ 4543 4544 switch (priv) { 4545 /* 4546 * Allow ktrace privileges for root in jail. 4547 */ 4548 case PRIV_KTRACE: 4549 return (0); 4550 4551 /* 4552 * Allow jailed processes to configure audit identity and 4553 * submit audit records (login, etc). In the future we may 4554 * want to further refine the relationship between audit and 4555 * jail. 4556 */ 4557 case PRIV_AUDIT_GETAUDIT: 4558 case PRIV_AUDIT_SETAUDIT: 4559 if (cred->cr_prison->pr_allow & PR_ALLOW_SETAUDIT) 4560 return (0); 4561 else 4562 return (EPERM); 4563 #if 0 4564 case PRIV_AUDIT_SUBMIT: 4565 #endif 4566 4567 /* 4568 * Allow jailed processes to manipulate process UNIX 4569 * credentials in any way they see fit. 4570 */ 4571 case PRIV_CRED_SETCRED: 4572 case PRIV_CRED_SETUID: 4573 case PRIV_CRED_SETEUID: 4574 case PRIV_CRED_SETGID: 4575 case PRIV_CRED_SETEGID: 4576 case PRIV_CRED_SETGROUPS: 4577 case PRIV_CRED_SETREUID: 4578 case PRIV_CRED_SETREGID: 4579 case PRIV_CRED_SETRESUID: 4580 case PRIV_CRED_SETRESGID: 4581 4582 /* 4583 * Jail implements visibility constraints already, so allow 4584 * jailed root to override uid/gid-based constraints. 4585 */ 4586 case PRIV_SEEOTHERGIDS: 4587 case PRIV_SEEOTHERUIDS: 4588 case PRIV_SEEJAILPROC: 4589 4590 /* 4591 * Jail implements inter-process debugging limits already, so 4592 * allow jailed root various debugging privileges. 4593 */ 4594 case PRIV_DEBUG_DIFFCRED: 4595 case PRIV_DEBUG_SUGID: 4596 case PRIV_DEBUG_UNPRIV: 4597 case PRIV_DEBUG_DIFFJAIL: 4598 4599 /* 4600 * Allow jail to set various resource limits and login 4601 * properties, and for now, exceed process resource limits. 4602 */ 4603 case PRIV_PROC_LIMIT: 4604 case PRIV_PROC_SETLOGIN: 4605 case PRIV_PROC_SETRLIMIT: 4606 4607 /* 4608 * Debuggers should work in jails. 4609 */ 4610 case PRIV_PROC_MEM_WRITE: 4611 4612 /* 4613 * System V and POSIX IPC privileges are granted in jail. 4614 */ 4615 case PRIV_IPC_READ: 4616 case PRIV_IPC_WRITE: 4617 case PRIV_IPC_ADMIN: 4618 case PRIV_IPC_MSGSIZE: 4619 case PRIV_MQ_ADMIN: 4620 4621 /* 4622 * Jail operations within a jail work on child jails. 4623 */ 4624 case PRIV_JAIL_ATTACH: 4625 case PRIV_JAIL_SET: 4626 case PRIV_JAIL_REMOVE: 4627 4628 /* 4629 * Jail implements its own inter-process limits, so allow 4630 * root processes in jail to change scheduling on other 4631 * processes in the same jail. Likewise for signalling. 4632 */ 4633 case PRIV_SCHED_DIFFCRED: 4634 case PRIV_SCHED_CPUSET: 4635 case PRIV_SCHED_DIFFJAIL: 4636 case PRIV_SIGNAL_DIFFCRED: 4637 case PRIV_SIGNAL_SUGID: 4638 case PRIV_SIGNAL_DIFFJAIL: 4639 4640 /* 4641 * Allow jailed processes to write to sysctls marked as jail 4642 * writable. 4643 */ 4644 case PRIV_SYSCTL_WRITEJAIL: 4645 4646 /* 4647 * Allow root in jail to manage a variety of quota 4648 * properties. These should likely be conditional on a 4649 * configuration option. 4650 */ 4651 case PRIV_VFS_GETQUOTA: 4652 case PRIV_VFS_SETQUOTA: 4653 4654 /* 4655 * Since Jail relies on chroot() to implement file system 4656 * protections, grant many VFS privileges to root in jail. 4657 * Be careful to exclude mount-related and NFS-related 4658 * privileges. 4659 */ 4660 case PRIV_VFS_READ: 4661 case PRIV_VFS_WRITE: 4662 case PRIV_VFS_ADMIN: 4663 case PRIV_VFS_EXEC: 4664 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 4665 case PRIV_VFS_CHFLAGS_DEV: 4666 case PRIV_VFS_CHOWN: 4667 case PRIV_VFS_CHROOT: 4668 case PRIV_VFS_RETAINSUGID: 4669 case PRIV_VFS_FCHROOT: 4670 case PRIV_VFS_LINK: 4671 case PRIV_VFS_SETGID: 4672 case PRIV_VFS_STAT: 4673 case PRIV_VFS_STICKYFILE: 4674 4675 /* 4676 * As in the non-jail case, non-root users are expected to be 4677 * able to read kernel/physical memory (provided /dev/[k]mem 4678 * exists in the jail and they have permission to access it). 4679 */ 4680 case PRIV_KMEM_READ: 4681 return (0); 4682 4683 /* 4684 * Depending on the global setting, allow privilege of 4685 * setting system flags. 4686 */ 4687 case PRIV_VFS_SYSFLAGS: 4688 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 4689 return (0); 4690 else 4691 return (EPERM); 4692 4693 /* 4694 * Depending on the global setting, allow privilege of 4695 * mounting/unmounting file systems. 4696 */ 4697 case PRIV_VFS_MOUNT: 4698 case PRIV_VFS_UNMOUNT: 4699 case PRIV_VFS_MOUNT_NONUSER: 4700 case PRIV_VFS_MOUNT_OWNER: 4701 pr = cred->cr_prison; 4702 prison_lock(pr); 4703 if (pr->pr_allow & PR_ALLOW_MOUNT && pr->pr_enforce_statfs < 2) 4704 error = 0; 4705 else 4706 error = EPERM; 4707 prison_unlock(pr); 4708 return (error); 4709 4710 /* 4711 * Jails should hold no disposition on the PRIV_VFS_READ_DIR 4712 * policy. priv_check_cred will not specifically allow it, and 4713 * we may want a MAC policy to allow it. 4714 */ 4715 case PRIV_VFS_READ_DIR: 4716 return (0); 4717 4718 /* 4719 * Conditionally allow privileged process in the jail to 4720 * manipulate filesystem extended attributes in the system 4721 * namespace. 4722 */ 4723 case PRIV_VFS_EXTATTR_SYSTEM: 4724 if ((cred->cr_prison->pr_allow & PR_ALLOW_EXTATTR) != 0) 4725 return (0); 4726 else 4727 return (EPERM); 4728 4729 /* 4730 * Conditionnaly allow locking (unlocking) physical pages 4731 * in memory. 4732 */ 4733 case PRIV_VM_MLOCK: 4734 case PRIV_VM_MUNLOCK: 4735 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK) 4736 return (0); 4737 else 4738 return (EPERM); 4739 4740 /* 4741 * Conditionally allow jailed root to bind reserved ports. 4742 */ 4743 case PRIV_NETINET_RESERVEDPORT: 4744 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS) 4745 return (0); 4746 else 4747 return (EPERM); 4748 4749 /* 4750 * Allow jailed root to reuse in-use ports. 4751 */ 4752 case PRIV_NETINET_REUSEPORT: 4753 return (0); 4754 4755 /* 4756 * Allow jailed root to set certain IPv4/6 (option) headers. 4757 */ 4758 case PRIV_NETINET_SETHDROPTS: 4759 return (0); 4760 4761 /* 4762 * Conditionally allow creating raw sockets in jail. 4763 */ 4764 case PRIV_NETINET_RAW: 4765 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 4766 return (0); 4767 else 4768 return (EPERM); 4769 4770 /* 4771 * Since jail implements its own visibility limits on netstat 4772 * sysctls, allow getcred. This allows identd to work in 4773 * jail. 4774 */ 4775 case PRIV_NETINET_GETCRED: 4776 return (0); 4777 4778 /* 4779 * Allow jailed root to set loginclass. 4780 */ 4781 case PRIV_PROC_SETLOGINCLASS: 4782 return (0); 4783 4784 /* 4785 * Do not allow a process inside a jail to read the kernel 4786 * message buffer unless explicitly permitted. 4787 */ 4788 case PRIV_MSGBUF: 4789 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF) 4790 return (0); 4791 return (EPERM); 4792 4793 /* 4794 * Conditionally allow privileged process in the jail adjust 4795 * machine time. 4796 */ 4797 case PRIV_ADJTIME: 4798 case PRIV_NTP_ADJTIME: 4799 if (cred->cr_prison->pr_allow & 4800 (PR_ALLOW_ADJTIME | PR_ALLOW_SETTIME)) { 4801 return (0); 4802 } 4803 return (EPERM); 4804 4805 /* 4806 * Conditionally allow privileged process in the jail set 4807 * machine time. 4808 */ 4809 case PRIV_SETTIMEOFDAY: 4810 case PRIV_CLOCK_SETTIME: 4811 if (cred->cr_prison->pr_allow & PR_ALLOW_SETTIME) 4812 return (0); 4813 else 4814 return (EPERM); 4815 4816 /* 4817 * Conditionally allow privileged process in the jail to modify 4818 * the routing table. 4819 */ 4820 case PRIV_NET_ROUTE: 4821 if (cred->cr_prison->pr_allow & PR_ALLOW_ROUTING) 4822 return (0); 4823 else 4824 return (EPERM); 4825 4826 case PRIV_VMM_CREATE: 4827 case PRIV_VMM_DESTROY: 4828 /* 4829 * Jailed root can create and destroy VMs; the vmm module 4830 * additionally checks for the allow.vmm flag. 4831 */ 4832 return (0); 4833 4834 case PRIV_VMM_PPTDEV: 4835 /* 4836 * Allow jailed root to manage passthrough devices. vmm(4) also 4837 * checks for the dynamically added allow.vmm_ppt. 4838 */ 4839 return (0); 4840 4841 default: 4842 /* 4843 * In all remaining cases, deny the privilege request. This 4844 * includes almost all network privileges, many system 4845 * configuration privileges. 4846 */ 4847 return (EPERM); 4848 } 4849 } 4850 4851 /* 4852 * Return the part of pr2's name that is relative to pr1, or the whole name 4853 * if it does not directly follow. 4854 */ 4855 4856 char * 4857 prison_name(struct prison *pr1, struct prison *pr2) 4858 { 4859 char *name; 4860 4861 /* Jails see themselves as "0" (if they see themselves at all). */ 4862 if (pr1 == pr2) 4863 return "0"; 4864 name = pr2->pr_name; 4865 if (prison_ischild(pr1, pr2)) { 4866 /* 4867 * pr1 isn't locked (and allprison_lock may not be either) 4868 * so its length can't be counted on. But the number of dots 4869 * can be counted on - and counted. 4870 */ 4871 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 4872 name = strchr(name, '.') + 1; 4873 } 4874 return (name); 4875 } 4876 4877 /* 4878 * Return the part of pr2's path that is relative to pr1, or the whole path 4879 * if it does not directly follow. 4880 */ 4881 static char * 4882 prison_path(struct prison *pr1, struct prison *pr2) 4883 { 4884 char *path1, *path2; 4885 int len1; 4886 4887 path1 = pr1->pr_path; 4888 path2 = pr2->pr_path; 4889 if (!strcmp(path1, "/")) 4890 return (path2); 4891 len1 = strlen(path1); 4892 if (strncmp(path1, path2, len1)) 4893 return (path2); 4894 if (path2[len1] == '\0') 4895 return "/"; 4896 if (path2[len1] == '/') 4897 return (path2 + len1); 4898 return (path2); 4899 } 4900 4901 /* 4902 * Jail-related sysctls. 4903 */ 4904 SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 4905 "Jails"); 4906 4907 #if defined(INET) || defined(INET6) 4908 /* 4909 * Copy address array to memory that would be then SYSCTL_OUT-ed. 4910 * sysctl_jail_list() helper. 4911 */ 4912 static void 4913 prison_ip_copyout(struct prison *pr, const pr_family_t af, void **out, int *len) 4914 { 4915 const struct prison_ip *pip; 4916 const size_t size = pr_families[af].size; 4917 4918 again: 4919 mtx_assert(&pr->pr_mtx, MA_OWNED); 4920 if ((pip = pr->pr_addrs[af]) != NULL) { 4921 if (*len < pip->ips) { 4922 *len = pip->ips; 4923 mtx_unlock(&pr->pr_mtx); 4924 *out = realloc(*out, *len * size, M_TEMP, M_WAITOK); 4925 mtx_lock(&pr->pr_mtx); 4926 goto again; 4927 } 4928 bcopy(pip->pr_ip, *out, pip->ips * size); 4929 } 4930 } 4931 #endif 4932 4933 static int 4934 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4935 { 4936 struct xprison *xp; 4937 struct prison *pr, *cpr; 4938 #ifdef INET 4939 struct in_addr *ip4 = NULL; 4940 int ip4s = 0; 4941 #endif 4942 #ifdef INET6 4943 struct in6_addr *ip6 = NULL; 4944 int ip6s = 0; 4945 #endif 4946 int descend, error; 4947 4948 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4949 pr = req->td->td_ucred->cr_prison; 4950 error = 0; 4951 sx_slock(&allprison_lock); 4952 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4953 mtx_lock(&cpr->pr_mtx); 4954 #ifdef INET 4955 prison_ip_copyout(cpr, PR_INET, (void **)&ip4, &ip4s); 4956 #endif 4957 #ifdef INET6 4958 prison_ip_copyout(cpr, PR_INET6, (void **)&ip6, &ip6s); 4959 #endif 4960 bzero(xp, sizeof(*xp)); 4961 xp->pr_version = XPRISON_VERSION; 4962 xp->pr_id = cpr->pr_id; 4963 xp->pr_state = cpr->pr_state; 4964 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4965 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4966 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4967 #ifdef INET 4968 xp->pr_ip4s = ip4s; 4969 #endif 4970 #ifdef INET6 4971 xp->pr_ip6s = ip6s; 4972 #endif 4973 mtx_unlock(&cpr->pr_mtx); 4974 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4975 if (error) 4976 break; 4977 #ifdef INET 4978 if (xp->pr_ip4s > 0) { 4979 error = SYSCTL_OUT(req, ip4, 4980 xp->pr_ip4s * sizeof(struct in_addr)); 4981 if (error) 4982 break; 4983 } 4984 #endif 4985 #ifdef INET6 4986 if (xp->pr_ip6s > 0) { 4987 error = SYSCTL_OUT(req, ip6, 4988 xp->pr_ip6s * sizeof(struct in6_addr)); 4989 if (error) 4990 break; 4991 } 4992 #endif 4993 } 4994 sx_sunlock(&allprison_lock); 4995 free(xp, M_TEMP); 4996 #ifdef INET 4997 free(ip4, M_TEMP); 4998 #endif 4999 #ifdef INET6 5000 free(ip6, M_TEMP); 5001 #endif 5002 return (error); 5003 } 5004 5005 SYSCTL_OID(_security_jail, OID_AUTO, list, 5006 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 5007 sysctl_jail_list, "S", "List of active jails"); 5008 5009 static int 5010 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 5011 { 5012 int error, injail; 5013 5014 injail = jailed(req->td->td_ucred); 5015 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 5016 5017 return (error); 5018 } 5019 5020 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 5021 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 5022 sysctl_jail_jailed, "I", "Process in jail?"); 5023 5024 static int 5025 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 5026 { 5027 int error, havevnet; 5028 #ifdef VIMAGE 5029 struct ucred *cred = req->td->td_ucred; 5030 5031 havevnet = jailed(cred) && prison_owns_vnet(cred->cr_prison); 5032 #else 5033 havevnet = 0; 5034 #endif 5035 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 5036 5037 return (error); 5038 } 5039 5040 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 5041 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 5042 sysctl_jail_vnet, "I", "Jail owns vnet?"); 5043 5044 #if defined(INET) || defined(INET6) 5045 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 5046 &jail_max_af_ips, 0, 5047 "Number of IP addresses a jail may have at most per address family (deprecated)"); 5048 #endif 5049 5050 /* 5051 * Default parameters for jail(2) compatibility. For historical reasons, 5052 * the sysctl names have varying similarity to the parameter names. Prisons 5053 * just see their own parameters, and can't change them. 5054 */ 5055 static int 5056 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 5057 { 5058 int error, i; 5059 5060 /* Get the current flag value, and convert it to a boolean. */ 5061 if (req->td->td_ucred->cr_prison == &prison0) { 5062 mtx_lock(&prison0.pr_mtx); 5063 i = (jail_default_allow & arg2) != 0; 5064 mtx_unlock(&prison0.pr_mtx); 5065 } else 5066 i = prison_allow(req->td->td_ucred, arg2); 5067 5068 if (arg1 != NULL) 5069 i = !i; 5070 error = sysctl_handle_int(oidp, &i, 0, req); 5071 if (error || !req->newptr) 5072 return (error); 5073 i = i ? arg2 : 0; 5074 if (arg1 != NULL) 5075 i ^= arg2; 5076 /* 5077 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 5078 * for writing. 5079 */ 5080 mtx_lock(&prison0.pr_mtx); 5081 jail_default_allow = (jail_default_allow & ~arg2) | i; 5082 mtx_unlock(&prison0.pr_mtx); 5083 return (0); 5084 } 5085 5086 /* 5087 * Do not add more here. Use SYSCTL_JAIL_PARAM (allow flags for jails) 5088 * instead. 5089 */ 5090 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 5091 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 5092 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 5093 "Processes in jail can set their hostnames (deprecated)"); 5094 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 5095 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 5096 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 5097 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 5098 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 5099 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 5100 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 5101 "Processes in jail can use System V IPC primitives (deprecated)"); 5102 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 5103 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 5104 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 5105 "Prison root can create raw sockets (deprecated)"); 5106 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 5107 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 5108 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 5109 "Processes in jail can alter system file flags (deprecated)"); 5110 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 5111 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 5112 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 5113 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 5114 SYSCTL_PROC(_security_jail, OID_AUTO, mlock_allowed, 5115 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 5116 NULL, PR_ALLOW_MLOCK, sysctl_jail_default_allow, "I", 5117 "Processes in jail can lock/unlock physical pages in memory (deprecated)"); 5118 5119 static int 5120 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 5121 { 5122 struct prison *pr; 5123 int level, error; 5124 5125 pr = req->td->td_ucred->cr_prison; 5126 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 5127 error = sysctl_handle_int(oidp, &level, 0, req); 5128 if (error || !req->newptr) 5129 return (error); 5130 *(int *)arg1 = level; 5131 return (0); 5132 } 5133 5134 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 5135 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 5136 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 5137 sysctl_jail_default_level, "I", 5138 "Processes in jail cannot see all mounted file systems (deprecated)"); 5139 5140 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 5141 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 5142 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 5143 sysctl_jail_default_level, "I", 5144 "Ruleset for the devfs filesystem in jail (deprecated)"); 5145 5146 SYSCTL_NODE(_security_jail, OID_AUTO, children, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 5147 "Limits and stats of child jails"); 5148 5149 static int 5150 sysctl_jail_children(SYSCTL_HANDLER_ARGS) 5151 { 5152 struct prison *pr; 5153 int i; 5154 5155 pr = req->td->td_ucred->cr_prison; 5156 5157 switch (oidp->oid_kind & CTLTYPE) { 5158 case CTLTYPE_INT: 5159 i = *(int *)((char *)pr + arg2); 5160 return (SYSCTL_OUT(req, &i, sizeof(i))); 5161 } 5162 5163 return (0); 5164 } 5165 5166 SYSCTL_PROC(_security_jail_children, OID_AUTO, max, 5167 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 5168 NULL, offsetof(struct prison, pr_childmax), sysctl_jail_children, 5169 "I", "Maximum number of child jails"); 5170 SYSCTL_PROC(_security_jail_children, OID_AUTO, cur, 5171 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 5172 NULL, offsetof(struct prison, pr_childcount), sysctl_jail_children, 5173 "I", "Current number of child jails"); 5174 5175 /* 5176 * Nodes to describe jail parameters. Maximum length of string parameters 5177 * is returned in the string itself, and the other parameters exist merely 5178 * to make themselves and their types known. 5179 */ 5180 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 5181 "Jail parameters"); 5182 5183 int 5184 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 5185 { 5186 int i; 5187 long l; 5188 size_t s; 5189 char numbuf[12]; 5190 5191 switch (oidp->oid_kind & CTLTYPE) 5192 { 5193 case CTLTYPE_LONG: 5194 case CTLTYPE_ULONG: 5195 l = 0; 5196 #ifdef SCTL_MASK32 5197 if (!(req->flags & SCTL_MASK32)) 5198 #endif 5199 return (SYSCTL_OUT(req, &l, sizeof(l))); 5200 case CTLTYPE_INT: 5201 case CTLTYPE_UINT: 5202 i = 0; 5203 return (SYSCTL_OUT(req, &i, sizeof(i))); 5204 case CTLTYPE_STRING: 5205 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 5206 return 5207 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 5208 case CTLTYPE_STRUCT: 5209 s = (size_t)arg2; 5210 return (SYSCTL_OUT(req, &s, sizeof(s))); 5211 } 5212 return (0); 5213 } 5214 5215 /* 5216 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 5217 * jail creation time but cannot be changed in an existing jail. 5218 */ 5219 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 5220 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 5221 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 5222 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 5223 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 5224 "I", "Jail secure level"); 5225 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 5226 "Jail value for kern.osreldate and uname -K"); 5227 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 5228 "Jail value for kern.osrelease and uname -r"); 5229 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 5230 "I", "Jail cannot see all mounted file systems"); 5231 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 5232 "I", "Ruleset for in-jail devfs mounts"); 5233 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 5234 "B", "Jail persistence"); 5235 #ifdef VIMAGE 5236 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 5237 "E,jailsys", "Virtual network stack"); 5238 #endif 5239 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 5240 "B", "Jail is in the process of shutting down"); 5241 5242 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 5243 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 5244 "I", "Current number of child jails"); 5245 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 5246 "I", "Maximum number of child jails"); 5247 5248 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 5249 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 5250 "Jail hostname"); 5251 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 5252 "Jail NIS domainname"); 5253 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 5254 "Jail host UUID"); 5255 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 5256 "LU", "Jail host ID"); 5257 5258 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 5259 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 5260 5261 #ifdef MAC 5262 SYSCTL_JAIL_PARAM_STRUCT(_mac, label, CTLFLAG_RW, sizeof(struct mac), 5263 "S,mac", "Jail MAC label"); 5264 #endif 5265 5266 #ifdef INET 5267 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 5268 "Jail IPv4 address virtualization"); 5269 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 5270 "S,in_addr,a", "Jail IPv4 addresses"); 5271 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 5272 "B", "Do (not) use IPv4 source address selection rather than the " 5273 "primary jail IPv4 address."); 5274 #endif 5275 #ifdef INET6 5276 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 5277 "Jail IPv6 address virtualization"); 5278 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 5279 "S,in6_addr,a", "Jail IPv6 addresses"); 5280 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 5281 "B", "Do (not) use IPv6 source address selection rather than the " 5282 "primary jail IPv6 address."); 5283 #endif 5284 5285 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 5286 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 5287 "B", "Jail may set hostname"); 5288 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 5289 "B", "Jail may use SYSV IPC"); 5290 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 5291 "B", "Jail may create raw sockets"); 5292 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 5293 "B", "Jail may alter system file flags"); 5294 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 5295 "B", "Jail may set file quotas"); 5296 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 5297 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 5298 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW, 5299 "B", "Jail may lock (unlock) physical pages in memory"); 5300 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW, 5301 "B", "Jail may bind sockets to reserved ports"); 5302 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW, 5303 "B", "Jail may read the kernel message buffer"); 5304 SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW, 5305 "B", "Unprivileged processes may use process debugging facilities"); 5306 SYSCTL_JAIL_PARAM(_allow, unprivileged_parent_tampering, 5307 CTLTYPE_INT | CTLFLAG_RW, "B", 5308 "Unprivileged parent jail processes may tamper with same-uid processes" 5309 " (signal/debug/cpuset)"); 5310 SYSCTL_JAIL_PARAM(_allow, suser, CTLTYPE_INT | CTLFLAG_RW, 5311 "B", "Processes in jail with uid 0 have privilege"); 5312 #ifdef VIMAGE 5313 SYSCTL_JAIL_PARAM(_allow, nfsd, CTLTYPE_INT | CTLFLAG_RW, 5314 "B", "Mountd/nfsd may run in the jail"); 5315 #endif 5316 SYSCTL_JAIL_PARAM(_allow, extattr, CTLTYPE_INT | CTLFLAG_RW, 5317 "B", "Jail may set system-level filesystem extended attributes"); 5318 SYSCTL_JAIL_PARAM(_allow, adjtime, CTLTYPE_INT | CTLFLAG_RW, 5319 "B", "Jail may adjust system time"); 5320 SYSCTL_JAIL_PARAM(_allow, settime, CTLTYPE_INT | CTLFLAG_RW, 5321 "B", "Jail may set system time"); 5322 SYSCTL_JAIL_PARAM(_allow, routing, CTLTYPE_INT | CTLFLAG_RW, 5323 "B", "Jail may modify routing table"); 5324 #ifdef AUDIT 5325 SYSCTL_JAIL_PARAM(_allow, setaudit, CTLTYPE_INT | CTLFLAG_RW, 5326 "B", "Jail may set and get audit session state"); 5327 #endif 5328 5329 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 5330 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 5331 "B", "Jail may mount/unmount jail-friendly file systems in general"); 5332 5333 /* 5334 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return 5335 * its associated bit in the pr_allow bitmask, or zero if the parameter was 5336 * not created. 5337 */ 5338 unsigned 5339 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr, 5340 const char *descr) 5341 { 5342 struct bool_flags *bf; 5343 struct sysctl_oid *parent; 5344 char *allow_name, *allow_noname, *allowed; 5345 #ifndef NO_SYSCTL_DESCR 5346 char *descr_deprecated; 5347 #endif 5348 u_int allow_flag; 5349 5350 if (prefix 5351 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name) 5352 < 0 || 5353 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name) 5354 < 0 5355 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 || 5356 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) { 5357 free(allow_name, M_PRISON); 5358 return 0; 5359 } 5360 5361 /* 5362 * See if this parameter has already beed added, i.e. a module was 5363 * previously loaded/unloaded. 5364 */ 5365 mtx_lock(&prison0.pr_mtx); 5366 for (bf = pr_flag_allow; 5367 bf < pr_flag_allow + nitems(pr_flag_allow) && 5368 atomic_load_int(&bf->flag) != 0; 5369 bf++) { 5370 if (strcmp(bf->name, allow_name) == 0) { 5371 allow_flag = bf->flag; 5372 goto no_add; 5373 } 5374 } 5375 5376 /* 5377 * Find a free bit in pr_allow_all, failing if there are none 5378 * (which shouldn't happen as long as we keep track of how many 5379 * potential dynamic flags exist). 5380 */ 5381 for (allow_flag = 1;; allow_flag <<= 1) { 5382 if (allow_flag == 0) 5383 goto no_add; 5384 if ((pr_allow_all & allow_flag) == 0) 5385 break; 5386 } 5387 5388 /* Note the parameter in the next open slot in pr_flag_allow. */ 5389 for (bf = pr_flag_allow; ; bf++) { 5390 if (bf == pr_flag_allow + nitems(pr_flag_allow)) { 5391 /* This should never happen, but is not fatal. */ 5392 allow_flag = 0; 5393 goto no_add; 5394 } 5395 if (atomic_load_int(&bf->flag) == 0) 5396 break; 5397 } 5398 bf->name = allow_name; 5399 bf->noname = allow_noname; 5400 pr_allow_all |= allow_flag; 5401 /* 5402 * prison0 always has permission for the new parameter. 5403 * Other jails must have it granted to them. 5404 */ 5405 prison0.pr_allow |= allow_flag; 5406 /* The flag indicates a valid entry, so make sure it is set last. */ 5407 atomic_store_rel_int(&bf->flag, allow_flag); 5408 mtx_unlock(&prison0.pr_mtx); 5409 5410 /* 5411 * Create sysctls for the parameter, and the back-compat global 5412 * permission. 5413 */ 5414 parent = prefix 5415 ? SYSCTL_ADD_NODE(NULL, 5416 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow), 5417 OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr) 5418 : &sysctl___security_jail_param_allow; 5419 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO, 5420 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 5421 NULL, 0, sysctl_jail_param, "B", descr); 5422 if ((prefix 5423 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name) 5424 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) { 5425 #ifndef NO_SYSCTL_DESCR 5426 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)", 5427 descr); 5428 #endif 5429 (void)SYSCTL_ADD_PROC(NULL, 5430 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed, 5431 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag, 5432 sysctl_jail_default_allow, "I", descr_deprecated); 5433 #ifndef NO_SYSCTL_DESCR 5434 free(descr_deprecated, M_TEMP); 5435 #endif 5436 free(allowed, M_TEMP); 5437 } 5438 return allow_flag; 5439 5440 no_add: 5441 mtx_unlock(&prison0.pr_mtx); 5442 free(allow_name, M_PRISON); 5443 free(allow_noname, M_PRISON); 5444 return allow_flag; 5445 } 5446 5447 /* 5448 * The VFS system will register jail-aware filesystems here. They each get 5449 * a parameter allow.mount.xxxfs and a flag to check when a jailed user 5450 * attempts to mount. 5451 */ 5452 void 5453 prison_add_vfs(struct vfsconf *vfsp) 5454 { 5455 #ifdef NO_SYSCTL_DESCR 5456 5457 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 5458 NULL, NULL); 5459 #else 5460 char *descr; 5461 5462 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system", 5463 vfsp->vfc_name); 5464 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 5465 NULL, descr); 5466 free(descr, M_TEMP); 5467 #endif 5468 } 5469 5470 #ifdef RACCT 5471 void 5472 prison_racct_foreach(void (*callback)(struct racct *racct, 5473 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 5474 void *arg2, void *arg3) 5475 { 5476 struct prison_racct *prr; 5477 5478 ASSERT_RACCT_ENABLED(); 5479 5480 sx_slock(&allprison_lock); 5481 if (pre != NULL) 5482 (pre)(); 5483 LIST_FOREACH(prr, &allprison_racct, prr_next) 5484 (callback)(prr->prr_racct, arg2, arg3); 5485 if (post != NULL) 5486 (post)(); 5487 sx_sunlock(&allprison_lock); 5488 } 5489 5490 static struct prison_racct * 5491 prison_racct_find_locked(const char *name) 5492 { 5493 struct prison_racct *prr; 5494 5495 ASSERT_RACCT_ENABLED(); 5496 sx_assert(&allprison_lock, SA_XLOCKED); 5497 5498 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 5499 return (NULL); 5500 5501 LIST_FOREACH(prr, &allprison_racct, prr_next) { 5502 if (strcmp(name, prr->prr_name) != 0) 5503 continue; 5504 5505 /* Found prison_racct with a matching name? */ 5506 prison_racct_hold(prr); 5507 return (prr); 5508 } 5509 5510 /* Add new prison_racct. */ 5511 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 5512 racct_create(&prr->prr_racct); 5513 5514 strcpy(prr->prr_name, name); 5515 refcount_init(&prr->prr_refcount, 1); 5516 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 5517 5518 return (prr); 5519 } 5520 5521 struct prison_racct * 5522 prison_racct_find(const char *name) 5523 { 5524 struct prison_racct *prr; 5525 5526 ASSERT_RACCT_ENABLED(); 5527 5528 sx_xlock(&allprison_lock); 5529 prr = prison_racct_find_locked(name); 5530 sx_xunlock(&allprison_lock); 5531 return (prr); 5532 } 5533 5534 void 5535 prison_racct_hold(struct prison_racct *prr) 5536 { 5537 5538 ASSERT_RACCT_ENABLED(); 5539 5540 refcount_acquire(&prr->prr_refcount); 5541 } 5542 5543 static void 5544 prison_racct_free_locked(struct prison_racct *prr) 5545 { 5546 5547 ASSERT_RACCT_ENABLED(); 5548 sx_assert(&allprison_lock, SA_XLOCKED); 5549 5550 if (refcount_release(&prr->prr_refcount)) { 5551 racct_destroy(&prr->prr_racct); 5552 LIST_REMOVE(prr, prr_next); 5553 free(prr, M_PRISON_RACCT); 5554 } 5555 } 5556 5557 void 5558 prison_racct_free(struct prison_racct *prr) 5559 { 5560 5561 ASSERT_RACCT_ENABLED(); 5562 sx_assert(&allprison_lock, SA_UNLOCKED); 5563 5564 if (refcount_release_if_not_last(&prr->prr_refcount)) 5565 return; 5566 5567 sx_xlock(&allprison_lock); 5568 prison_racct_free_locked(prr); 5569 sx_xunlock(&allprison_lock); 5570 } 5571 5572 static void 5573 prison_racct_attach(struct prison *pr) 5574 { 5575 struct prison_racct *prr; 5576 5577 ASSERT_RACCT_ENABLED(); 5578 sx_assert(&allprison_lock, SA_XLOCKED); 5579 5580 prr = prison_racct_find_locked(pr->pr_name); 5581 KASSERT(prr != NULL, ("cannot find prison_racct")); 5582 5583 pr->pr_prison_racct = prr; 5584 } 5585 5586 /* 5587 * Handle jail renaming. From the racct point of view, renaming means 5588 * moving from one prison_racct to another. 5589 */ 5590 static void 5591 prison_racct_modify(struct prison *pr) 5592 { 5593 #ifdef RCTL 5594 struct proc *p; 5595 struct ucred *cred; 5596 #endif 5597 struct prison_racct *oldprr; 5598 5599 ASSERT_RACCT_ENABLED(); 5600 5601 sx_slock(&allproc_lock); 5602 sx_xlock(&allprison_lock); 5603 5604 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 5605 sx_xunlock(&allprison_lock); 5606 sx_sunlock(&allproc_lock); 5607 return; 5608 } 5609 5610 oldprr = pr->pr_prison_racct; 5611 pr->pr_prison_racct = NULL; 5612 5613 prison_racct_attach(pr); 5614 5615 /* 5616 * Move resource utilisation records. 5617 */ 5618 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 5619 5620 #ifdef RCTL 5621 /* 5622 * Force rctl to reattach rules to processes. 5623 */ 5624 FOREACH_PROC_IN_SYSTEM(p) { 5625 PROC_LOCK(p); 5626 cred = crhold(p->p_ucred); 5627 PROC_UNLOCK(p); 5628 rctl_proc_ucred_changed(p, cred); 5629 crfree(cred); 5630 } 5631 #endif 5632 5633 sx_sunlock(&allproc_lock); 5634 prison_racct_free_locked(oldprr); 5635 sx_xunlock(&allprison_lock); 5636 } 5637 5638 static void 5639 prison_racct_detach(struct prison *pr) 5640 { 5641 5642 ASSERT_RACCT_ENABLED(); 5643 sx_assert(&allprison_lock, SA_UNLOCKED); 5644 5645 if (pr->pr_prison_racct == NULL) 5646 return; 5647 prison_racct_free(pr->pr_prison_racct); 5648 pr->pr_prison_racct = NULL; 5649 } 5650 #endif /* RACCT */ 5651 5652 /* 5653 * Submit a knote for a prison, locking if necessary. 5654 */ 5655 static void 5656 prison_knote(struct prison *pr, long hint) 5657 { 5658 int locked; 5659 5660 locked = mtx_owned(&pr->pr_mtx); 5661 if (!locked) 5662 mtx_lock(&pr->pr_mtx); 5663 KNOTE_LOCKED(pr->pr_klist, hint); 5664 jaildesc_knote(pr, hint); 5665 if (!locked) 5666 mtx_unlock(&pr->pr_mtx); 5667 } 5668 5669 #ifdef DDB 5670 5671 static void 5672 db_show_prison(struct prison *pr) 5673 { 5674 struct bool_flags *bf; 5675 struct jailsys_flags *jsf; 5676 #if defined(INET) || defined(INET6) 5677 int ii; 5678 struct prison_ip *pip; 5679 #endif 5680 unsigned f; 5681 #ifdef INET 5682 char ip4buf[INET_ADDRSTRLEN]; 5683 #endif 5684 #ifdef INET6 5685 char ip6buf[INET6_ADDRSTRLEN]; 5686 #endif 5687 5688 db_printf("prison %p:\n", pr); 5689 db_printf(" jid = %d\n", pr->pr_id); 5690 db_printf(" name = %s\n", pr->pr_name); 5691 db_printf(" parent = %p\n", pr->pr_parent); 5692 db_printf(" ref = %d\n", pr->pr_ref); 5693 db_printf(" uref = %d\n", pr->pr_uref); 5694 db_printf(" state = %s\n", 5695 pr->pr_state == PRISON_STATE_ALIVE ? "alive" : 5696 pr->pr_state == PRISON_STATE_DYING ? "dying" : 5697 "invalid"); 5698 db_printf(" path = %s\n", pr->pr_path); 5699 db_printf(" cpuset = %d\n", pr->pr_cpuset 5700 ? pr->pr_cpuset->cs_id : -1); 5701 #ifdef VIMAGE 5702 db_printf(" vnet = %p\n", pr->pr_vnet); 5703 #endif 5704 db_printf(" root = %p\n", pr->pr_root); 5705 db_printf(" securelevel = %d\n", pr->pr_securelevel); 5706 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 5707 db_printf(" children.max = %d\n", pr->pr_childmax); 5708 db_printf(" children.cur = %d\n", pr->pr_childcount); 5709 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 5710 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 5711 db_printf(" flags = 0x%x", pr->pr_flags); 5712 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++) 5713 if (pr->pr_flags & bf->flag) 5714 db_printf(" %s", bf->name); 5715 for (jsf = pr_flag_jailsys; 5716 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 5717 jsf++) { 5718 f = pr->pr_flags & (jsf->disable | jsf->new); 5719 db_printf(" %-16s= %s\n", jsf->name, 5720 (f != 0 && f == jsf->disable) ? "disable" 5721 : (f == jsf->new) ? "new" 5722 : "inherit"); 5723 } 5724 db_printf(" allow = 0x%x", pr->pr_allow); 5725 for (bf = pr_flag_allow; 5726 bf < pr_flag_allow + nitems(pr_flag_allow) && 5727 atomic_load_int(&bf->flag) != 0; 5728 bf++) 5729 if (pr->pr_allow & bf->flag) 5730 db_printf(" %s", bf->name); 5731 db_printf("\n"); 5732 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 5733 db_printf(" host.hostname = %s\n", pr->pr_hostname); 5734 db_printf(" host.domainname = %s\n", pr->pr_domainname); 5735 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 5736 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 5737 #ifdef INET 5738 if ((pip = pr->pr_addrs[PR_INET]) != NULL) { 5739 db_printf(" ip4s = %d\n", pip->ips); 5740 for (ii = 0; ii < pip->ips; ii++) 5741 db_printf(" %s %s\n", 5742 ii == 0 ? "ip4.addr =" : " ", 5743 inet_ntoa_r( 5744 *(const struct in_addr *)PR_IP(pip, PR_INET, ii), 5745 ip4buf)); 5746 } 5747 #endif 5748 #ifdef INET6 5749 if ((pip = pr->pr_addrs[PR_INET6]) != NULL) { 5750 db_printf(" ip6s = %d\n", pip->ips); 5751 for (ii = 0; ii < pip->ips; ii++) 5752 db_printf(" %s %s\n", 5753 ii == 0 ? "ip6.addr =" : " ", 5754 ip6_sprintf(ip6buf, 5755 (const struct in6_addr *)PR_IP(pip, PR_INET6, ii))); 5756 } 5757 #endif 5758 } 5759 5760 DB_SHOW_COMMAND(prison, db_show_prison_command) 5761 { 5762 struct prison *pr; 5763 5764 if (!have_addr) { 5765 /* 5766 * Show all prisons in the list, and prison0 which is not 5767 * listed. 5768 */ 5769 db_show_prison(&prison0); 5770 if (!db_pager_quit) { 5771 TAILQ_FOREACH(pr, &allprison, pr_list) { 5772 db_show_prison(pr); 5773 if (db_pager_quit) 5774 break; 5775 } 5776 } 5777 return; 5778 } 5779 5780 if (addr == 0) 5781 pr = &prison0; 5782 else { 5783 /* Look for a prison with the ID and with references. */ 5784 TAILQ_FOREACH(pr, &allprison, pr_list) 5785 if (pr->pr_id == addr && pr->pr_ref > 0) 5786 break; 5787 if (pr == NULL) 5788 /* Look again, without requiring a reference. */ 5789 TAILQ_FOREACH(pr, &allprison, pr_list) 5790 if (pr->pr_id == addr) 5791 break; 5792 if (pr == NULL) 5793 /* Assume address points to a valid prison. */ 5794 pr = (struct prison *)addr; 5795 } 5796 db_show_prison(pr); 5797 } 5798 5799 #endif /* DDB */ 5800