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