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