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