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