1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1999 Poul-Henning Kamp. 5 * Copyright (c) 2008 Bjoern A. Zeeb. 6 * Copyright (c) 2009 James Gritton. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __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 case AF_NETLINK: 3444 break; 3445 default: 3446 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3447 error = EAFNOSUPPORT; 3448 } 3449 return (error); 3450 } 3451 3452 /* 3453 * Check if given address belongs to the jail referenced by cred (wrapper to 3454 * prison_check_ip[46]). 3455 * 3456 * Returns 0 if jail doesn't restrict the address family or if address belongs 3457 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3458 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3459 */ 3460 int 3461 prison_if(struct ucred *cred, const struct sockaddr *sa) 3462 { 3463 #ifdef INET 3464 const struct sockaddr_in *sai; 3465 #endif 3466 #ifdef INET6 3467 const struct sockaddr_in6 *sai6; 3468 #endif 3469 int error; 3470 3471 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3472 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3473 3474 #ifdef VIMAGE 3475 if (prison_owns_vnet(cred)) 3476 return (0); 3477 #endif 3478 3479 error = 0; 3480 switch (sa->sa_family) 3481 { 3482 #ifdef INET 3483 case AF_INET: 3484 sai = (const struct sockaddr_in *)sa; 3485 error = prison_check_ip4(cred, &sai->sin_addr); 3486 break; 3487 #endif 3488 #ifdef INET6 3489 case AF_INET6: 3490 sai6 = (const struct sockaddr_in6 *)sa; 3491 error = prison_check_ip6(cred, &sai6->sin6_addr); 3492 break; 3493 #endif 3494 default: 3495 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3496 error = EAFNOSUPPORT; 3497 } 3498 return (error); 3499 } 3500 3501 /* 3502 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3503 */ 3504 int 3505 prison_check(struct ucred *cred1, struct ucred *cred2) 3506 { 3507 3508 return ((cred1->cr_prison == cred2->cr_prison || 3509 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3510 } 3511 3512 /* 3513 * For mountd/nfsd to run within a prison, it must be: 3514 * - A vnet prison. 3515 * - PR_ALLOW_NFSD must be set on it. 3516 * - The root directory (pr_root) of the prison must be 3517 * a file system mount point, so the mountd can hang 3518 * export information on it. 3519 * - The prison's enforce_statfs cannot be 0, so that 3520 * mountd(8) can do exports. 3521 */ 3522 bool 3523 prison_check_nfsd(struct ucred *cred) 3524 { 3525 3526 if (jailed_without_vnet(cred)) 3527 return (false); 3528 if (!prison_allow(cred, PR_ALLOW_NFSD)) 3529 return (false); 3530 if ((cred->cr_prison->pr_root->v_vflag & VV_ROOT) == 0) 3531 return (false); 3532 if (cred->cr_prison->pr_enforce_statfs == 0) 3533 return (false); 3534 return (true); 3535 } 3536 3537 /* 3538 * Return true if p2 is a child of p1, otherwise false. 3539 */ 3540 bool 3541 prison_ischild(struct prison *pr1, struct prison *pr2) 3542 { 3543 3544 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3545 if (pr1 == pr2) 3546 return (true); 3547 return (false); 3548 } 3549 3550 /* 3551 * Return true if the prison is currently alive. A prison is alive if it 3552 * holds user references and it isn't being removed. 3553 */ 3554 bool 3555 prison_isalive(const struct prison *pr) 3556 { 3557 3558 if (__predict_false(pr->pr_state != PRISON_STATE_ALIVE)) 3559 return (false); 3560 return (true); 3561 } 3562 3563 /* 3564 * Return true if the prison is currently valid. A prison is valid if it has 3565 * been fully created, and is not being destroyed. Note that dying prisons 3566 * are still considered valid. Invalid prisons won't be found under normal 3567 * circumstances, as they're only put in that state by functions that have 3568 * an exclusive hold on allprison_lock. 3569 */ 3570 bool 3571 prison_isvalid(struct prison *pr) 3572 { 3573 3574 if (__predict_false(pr->pr_state == PRISON_STATE_INVALID)) 3575 return (false); 3576 if (__predict_false(refcount_load(&pr->pr_ref) == 0)) 3577 return (false); 3578 return (true); 3579 } 3580 3581 /* 3582 * Return true if the passed credential is in a jail and that jail does not 3583 * have its own virtual network stack, otherwise false. 3584 */ 3585 bool 3586 jailed_without_vnet(struct ucred *cred) 3587 { 3588 3589 if (!jailed(cred)) 3590 return (false); 3591 #ifdef VIMAGE 3592 if (prison_owns_vnet(cred)) 3593 return (false); 3594 #endif 3595 3596 return (true); 3597 } 3598 3599 /* 3600 * Return the correct hostname (domainname, et al) for the passed credential. 3601 */ 3602 void 3603 getcredhostname(struct ucred *cred, char *buf, size_t size) 3604 { 3605 struct prison *pr; 3606 3607 /* 3608 * A NULL credential can be used to shortcut to the physical 3609 * system's hostname. 3610 */ 3611 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3612 mtx_lock(&pr->pr_mtx); 3613 strlcpy(buf, pr->pr_hostname, size); 3614 mtx_unlock(&pr->pr_mtx); 3615 } 3616 3617 void 3618 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3619 { 3620 3621 mtx_lock(&cred->cr_prison->pr_mtx); 3622 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3623 mtx_unlock(&cred->cr_prison->pr_mtx); 3624 } 3625 3626 void 3627 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3628 { 3629 3630 mtx_lock(&cred->cr_prison->pr_mtx); 3631 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3632 mtx_unlock(&cred->cr_prison->pr_mtx); 3633 } 3634 3635 void 3636 getcredhostid(struct ucred *cred, unsigned long *hostid) 3637 { 3638 3639 mtx_lock(&cred->cr_prison->pr_mtx); 3640 *hostid = cred->cr_prison->pr_hostid; 3641 mtx_unlock(&cred->cr_prison->pr_mtx); 3642 } 3643 3644 void 3645 getjailname(struct ucred *cred, char *name, size_t len) 3646 { 3647 3648 mtx_lock(&cred->cr_prison->pr_mtx); 3649 strlcpy(name, cred->cr_prison->pr_name, len); 3650 mtx_unlock(&cred->cr_prison->pr_mtx); 3651 } 3652 3653 #ifdef VIMAGE 3654 /* 3655 * Determine whether the prison represented by cred owns 3656 * its vnet rather than having it inherited. 3657 * 3658 * Returns true in case the prison owns the vnet, false otherwise. 3659 */ 3660 bool 3661 prison_owns_vnet(struct ucred *cred) 3662 { 3663 3664 /* 3665 * vnets cannot be added/removed after jail creation, 3666 * so no need to lock here. 3667 */ 3668 return ((cred->cr_prison->pr_flags & PR_VNET) != 0); 3669 } 3670 #endif 3671 3672 /* 3673 * Determine whether the subject represented by cred can "see" 3674 * status of a mount point. 3675 * Returns: 0 for permitted, ENOENT otherwise. 3676 * XXX: This function should be called cr_canseemount() and should be 3677 * placed in kern_prot.c. 3678 */ 3679 int 3680 prison_canseemount(struct ucred *cred, struct mount *mp) 3681 { 3682 struct prison *pr; 3683 struct statfs *sp; 3684 size_t len; 3685 3686 pr = cred->cr_prison; 3687 if (pr->pr_enforce_statfs == 0) 3688 return (0); 3689 if (pr->pr_root->v_mount == mp) 3690 return (0); 3691 if (pr->pr_enforce_statfs == 2) 3692 return (ENOENT); 3693 /* 3694 * If jail's chroot directory is set to "/" we should be able to see 3695 * all mount-points from inside a jail. 3696 * This is ugly check, but this is the only situation when jail's 3697 * directory ends with '/'. 3698 */ 3699 if (strcmp(pr->pr_path, "/") == 0) 3700 return (0); 3701 len = strlen(pr->pr_path); 3702 sp = &mp->mnt_stat; 3703 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3704 return (ENOENT); 3705 /* 3706 * Be sure that we don't have situation where jail's root directory 3707 * is "/some/path" and mount point is "/some/pathpath". 3708 */ 3709 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3710 return (ENOENT); 3711 return (0); 3712 } 3713 3714 void 3715 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3716 { 3717 char jpath[MAXPATHLEN]; 3718 struct prison *pr; 3719 size_t len; 3720 3721 pr = cred->cr_prison; 3722 if (pr->pr_enforce_statfs == 0) 3723 return; 3724 if (prison_canseemount(cred, mp) != 0) { 3725 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3726 strlcpy(sp->f_mntonname, "[restricted]", 3727 sizeof(sp->f_mntonname)); 3728 return; 3729 } 3730 if (pr->pr_root->v_mount == mp) { 3731 /* 3732 * Clear current buffer data, so we are sure nothing from 3733 * the valid path left there. 3734 */ 3735 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3736 *sp->f_mntonname = '/'; 3737 return; 3738 } 3739 /* 3740 * If jail's chroot directory is set to "/" we should be able to see 3741 * all mount-points from inside a jail. 3742 */ 3743 if (strcmp(pr->pr_path, "/") == 0) 3744 return; 3745 len = strlen(pr->pr_path); 3746 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3747 /* 3748 * Clear current buffer data, so we are sure nothing from 3749 * the valid path left there. 3750 */ 3751 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3752 if (*jpath == '\0') { 3753 /* Should never happen. */ 3754 *sp->f_mntonname = '/'; 3755 } else { 3756 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3757 } 3758 } 3759 3760 /* 3761 * Check with permission for a specific privilege is granted within jail. We 3762 * have a specific list of accepted privileges; the rest are denied. 3763 */ 3764 int 3765 prison_priv_check(struct ucred *cred, int priv) 3766 { 3767 struct prison *pr; 3768 int error; 3769 3770 /* 3771 * Some policies have custom handlers. This routine should not be 3772 * called for them. See priv_check_cred(). 3773 */ 3774 switch (priv) { 3775 case PRIV_VFS_LOOKUP: 3776 case PRIV_VFS_GENERATION: 3777 KASSERT(0, ("prison_priv_check instead of a custom handler " 3778 "called for %d\n", priv)); 3779 } 3780 3781 if (!jailed(cred)) 3782 return (0); 3783 3784 #ifdef VIMAGE 3785 /* 3786 * Privileges specific to prisons with a virtual network stack. 3787 * There might be a duplicate entry here in case the privilege 3788 * is only granted conditionally in the legacy jail case. 3789 */ 3790 switch (priv) { 3791 /* 3792 * NFS-specific privileges. 3793 */ 3794 case PRIV_NFS_DAEMON: 3795 case PRIV_VFS_GETFH: 3796 case PRIV_VFS_MOUNT_EXPORTED: 3797 if (!prison_check_nfsd(cred)) 3798 return (EPERM); 3799 #ifdef notyet 3800 case PRIV_NFS_LOCKD: 3801 #endif 3802 /* 3803 * Network stack privileges. 3804 */ 3805 case PRIV_NET_BRIDGE: 3806 case PRIV_NET_GRE: 3807 case PRIV_NET_BPF: 3808 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3809 case PRIV_NET_ROUTE: 3810 case PRIV_NET_TAP: 3811 case PRIV_NET_SETIFMTU: 3812 case PRIV_NET_SETIFFLAGS: 3813 case PRIV_NET_SETIFCAP: 3814 case PRIV_NET_SETIFDESCR: 3815 case PRIV_NET_SETIFNAME : 3816 case PRIV_NET_SETIFMETRIC: 3817 case PRIV_NET_SETIFPHYS: 3818 case PRIV_NET_SETIFMAC: 3819 case PRIV_NET_SETLANPCP: 3820 case PRIV_NET_ADDMULTI: 3821 case PRIV_NET_DELMULTI: 3822 case PRIV_NET_HWIOCTL: 3823 case PRIV_NET_SETLLADDR: 3824 case PRIV_NET_ADDIFGROUP: 3825 case PRIV_NET_DELIFGROUP: 3826 case PRIV_NET_IFCREATE: 3827 case PRIV_NET_IFDESTROY: 3828 case PRIV_NET_ADDIFADDR: 3829 case PRIV_NET_DELIFADDR: 3830 case PRIV_NET_LAGG: 3831 case PRIV_NET_GIF: 3832 case PRIV_NET_SETIFVNET: 3833 case PRIV_NET_SETIFFIB: 3834 case PRIV_NET_OVPN: 3835 case PRIV_NET_ME: 3836 case PRIV_NET_WG: 3837 3838 /* 3839 * 802.11-related privileges. 3840 */ 3841 case PRIV_NET80211_VAP_GETKEY: 3842 case PRIV_NET80211_VAP_MANAGE: 3843 3844 #ifdef notyet 3845 /* 3846 * ATM privileges. 3847 */ 3848 case PRIV_NETATM_CFG: 3849 case PRIV_NETATM_ADD: 3850 case PRIV_NETATM_DEL: 3851 case PRIV_NETATM_SET: 3852 3853 /* 3854 * Bluetooth privileges. 3855 */ 3856 case PRIV_NETBLUETOOTH_RAW: 3857 #endif 3858 3859 /* 3860 * Netgraph and netgraph module privileges. 3861 */ 3862 case PRIV_NETGRAPH_CONTROL: 3863 #ifdef notyet 3864 case PRIV_NETGRAPH_TTY: 3865 #endif 3866 3867 /* 3868 * IPv4 and IPv6 privileges. 3869 */ 3870 case PRIV_NETINET_IPFW: 3871 case PRIV_NETINET_DIVERT: 3872 case PRIV_NETINET_PF: 3873 case PRIV_NETINET_DUMMYNET: 3874 case PRIV_NETINET_CARP: 3875 case PRIV_NETINET_MROUTE: 3876 case PRIV_NETINET_RAW: 3877 case PRIV_NETINET_ADDRCTRL6: 3878 case PRIV_NETINET_ND6: 3879 case PRIV_NETINET_SCOPE6: 3880 case PRIV_NETINET_ALIFETIME6: 3881 case PRIV_NETINET_IPSEC: 3882 case PRIV_NETINET_BINDANY: 3883 3884 #ifdef notyet 3885 /* 3886 * NCP privileges. 3887 */ 3888 case PRIV_NETNCP: 3889 3890 /* 3891 * SMB privileges. 3892 */ 3893 case PRIV_NETSMB: 3894 #endif 3895 3896 /* 3897 * No default: or deny here. 3898 * In case of no permit fall through to next switch(). 3899 */ 3900 if (cred->cr_prison->pr_flags & PR_VNET) 3901 return (0); 3902 } 3903 #endif /* VIMAGE */ 3904 3905 switch (priv) { 3906 /* 3907 * Allow ktrace privileges for root in jail. 3908 */ 3909 case PRIV_KTRACE: 3910 3911 #if 0 3912 /* 3913 * Allow jailed processes to configure audit identity and 3914 * submit audit records (login, etc). In the future we may 3915 * want to further refine the relationship between audit and 3916 * jail. 3917 */ 3918 case PRIV_AUDIT_GETAUDIT: 3919 case PRIV_AUDIT_SETAUDIT: 3920 case PRIV_AUDIT_SUBMIT: 3921 #endif 3922 3923 /* 3924 * Allow jailed processes to manipulate process UNIX 3925 * credentials in any way they see fit. 3926 */ 3927 case PRIV_CRED_SETUID: 3928 case PRIV_CRED_SETEUID: 3929 case PRIV_CRED_SETGID: 3930 case PRIV_CRED_SETEGID: 3931 case PRIV_CRED_SETGROUPS: 3932 case PRIV_CRED_SETREUID: 3933 case PRIV_CRED_SETREGID: 3934 case PRIV_CRED_SETRESUID: 3935 case PRIV_CRED_SETRESGID: 3936 3937 /* 3938 * Jail implements visibility constraints already, so allow 3939 * jailed root to override uid/gid-based constraints. 3940 */ 3941 case PRIV_SEEOTHERGIDS: 3942 case PRIV_SEEOTHERUIDS: 3943 3944 /* 3945 * Jail implements inter-process debugging limits already, so 3946 * allow jailed root various debugging privileges. 3947 */ 3948 case PRIV_DEBUG_DIFFCRED: 3949 case PRIV_DEBUG_SUGID: 3950 case PRIV_DEBUG_UNPRIV: 3951 3952 /* 3953 * Allow jail to set various resource limits and login 3954 * properties, and for now, exceed process resource limits. 3955 */ 3956 case PRIV_PROC_LIMIT: 3957 case PRIV_PROC_SETLOGIN: 3958 case PRIV_PROC_SETRLIMIT: 3959 3960 /* 3961 * System V and POSIX IPC privileges are granted in jail. 3962 */ 3963 case PRIV_IPC_READ: 3964 case PRIV_IPC_WRITE: 3965 case PRIV_IPC_ADMIN: 3966 case PRIV_IPC_MSGSIZE: 3967 case PRIV_MQ_ADMIN: 3968 3969 /* 3970 * Jail operations within a jail work on child jails. 3971 */ 3972 case PRIV_JAIL_ATTACH: 3973 case PRIV_JAIL_SET: 3974 case PRIV_JAIL_REMOVE: 3975 3976 /* 3977 * Jail implements its own inter-process limits, so allow 3978 * root processes in jail to change scheduling on other 3979 * processes in the same jail. Likewise for signalling. 3980 */ 3981 case PRIV_SCHED_DIFFCRED: 3982 case PRIV_SCHED_CPUSET: 3983 case PRIV_SIGNAL_DIFFCRED: 3984 case PRIV_SIGNAL_SUGID: 3985 3986 /* 3987 * Allow jailed processes to write to sysctls marked as jail 3988 * writable. 3989 */ 3990 case PRIV_SYSCTL_WRITEJAIL: 3991 3992 /* 3993 * Allow root in jail to manage a variety of quota 3994 * properties. These should likely be conditional on a 3995 * configuration option. 3996 */ 3997 case PRIV_VFS_GETQUOTA: 3998 case PRIV_VFS_SETQUOTA: 3999 4000 /* 4001 * Since Jail relies on chroot() to implement file system 4002 * protections, grant many VFS privileges to root in jail. 4003 * Be careful to exclude mount-related and NFS-related 4004 * privileges. 4005 */ 4006 case PRIV_VFS_READ: 4007 case PRIV_VFS_WRITE: 4008 case PRIV_VFS_ADMIN: 4009 case PRIV_VFS_EXEC: 4010 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 4011 case PRIV_VFS_CHFLAGS_DEV: 4012 case PRIV_VFS_CHOWN: 4013 case PRIV_VFS_CHROOT: 4014 case PRIV_VFS_RETAINSUGID: 4015 case PRIV_VFS_FCHROOT: 4016 case PRIV_VFS_LINK: 4017 case PRIV_VFS_SETGID: 4018 case PRIV_VFS_STAT: 4019 case PRIV_VFS_STICKYFILE: 4020 4021 /* 4022 * As in the non-jail case, non-root users are expected to be 4023 * able to read kernel/physical memory (provided /dev/[k]mem 4024 * exists in the jail and they have permission to access it). 4025 */ 4026 case PRIV_KMEM_READ: 4027 return (0); 4028 4029 /* 4030 * Depending on the global setting, allow privilege of 4031 * setting system flags. 4032 */ 4033 case PRIV_VFS_SYSFLAGS: 4034 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 4035 return (0); 4036 else 4037 return (EPERM); 4038 4039 /* 4040 * Depending on the global setting, allow privilege of 4041 * mounting/unmounting file systems. 4042 */ 4043 case PRIV_VFS_MOUNT: 4044 case PRIV_VFS_UNMOUNT: 4045 case PRIV_VFS_MOUNT_NONUSER: 4046 case PRIV_VFS_MOUNT_OWNER: 4047 pr = cred->cr_prison; 4048 prison_lock(pr); 4049 if (pr->pr_allow & PR_ALLOW_MOUNT && pr->pr_enforce_statfs < 2) 4050 error = 0; 4051 else 4052 error = EPERM; 4053 prison_unlock(pr); 4054 return (error); 4055 4056 /* 4057 * Jails should hold no disposition on the PRIV_VFS_READ_DIR 4058 * policy. priv_check_cred will not specifically allow it, and 4059 * we may want a MAC policy to allow it. 4060 */ 4061 case PRIV_VFS_READ_DIR: 4062 return (0); 4063 4064 /* 4065 * Conditionnaly allow locking (unlocking) physical pages 4066 * in memory. 4067 */ 4068 case PRIV_VM_MLOCK: 4069 case PRIV_VM_MUNLOCK: 4070 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK) 4071 return (0); 4072 else 4073 return (EPERM); 4074 4075 /* 4076 * Conditionally allow jailed root to bind reserved ports. 4077 */ 4078 case PRIV_NETINET_RESERVEDPORT: 4079 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS) 4080 return (0); 4081 else 4082 return (EPERM); 4083 4084 /* 4085 * Allow jailed root to reuse in-use ports. 4086 */ 4087 case PRIV_NETINET_REUSEPORT: 4088 return (0); 4089 4090 /* 4091 * Allow jailed root to set certain IPv4/6 (option) headers. 4092 */ 4093 case PRIV_NETINET_SETHDROPTS: 4094 return (0); 4095 4096 /* 4097 * Conditionally allow creating raw sockets in jail. 4098 */ 4099 case PRIV_NETINET_RAW: 4100 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 4101 return (0); 4102 else 4103 return (EPERM); 4104 4105 /* 4106 * Since jail implements its own visibility limits on netstat 4107 * sysctls, allow getcred. This allows identd to work in 4108 * jail. 4109 */ 4110 case PRIV_NETINET_GETCRED: 4111 return (0); 4112 4113 /* 4114 * Allow jailed root to set loginclass. 4115 */ 4116 case PRIV_PROC_SETLOGINCLASS: 4117 return (0); 4118 4119 /* 4120 * Do not allow a process inside a jail to read the kernel 4121 * message buffer unless explicitly permitted. 4122 */ 4123 case PRIV_MSGBUF: 4124 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF) 4125 return (0); 4126 return (EPERM); 4127 4128 default: 4129 /* 4130 * In all remaining cases, deny the privilege request. This 4131 * includes almost all network privileges, many system 4132 * configuration privileges. 4133 */ 4134 return (EPERM); 4135 } 4136 } 4137 4138 /* 4139 * Return the part of pr2's name that is relative to pr1, or the whole name 4140 * if it does not directly follow. 4141 */ 4142 4143 char * 4144 prison_name(struct prison *pr1, struct prison *pr2) 4145 { 4146 char *name; 4147 4148 /* Jails see themselves as "0" (if they see themselves at all). */ 4149 if (pr1 == pr2) 4150 return "0"; 4151 name = pr2->pr_name; 4152 if (prison_ischild(pr1, pr2)) { 4153 /* 4154 * pr1 isn't locked (and allprison_lock may not be either) 4155 * so its length can't be counted on. But the number of dots 4156 * can be counted on - and counted. 4157 */ 4158 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 4159 name = strchr(name, '.') + 1; 4160 } 4161 return (name); 4162 } 4163 4164 /* 4165 * Return the part of pr2's path that is relative to pr1, or the whole path 4166 * if it does not directly follow. 4167 */ 4168 static char * 4169 prison_path(struct prison *pr1, struct prison *pr2) 4170 { 4171 char *path1, *path2; 4172 int len1; 4173 4174 path1 = pr1->pr_path; 4175 path2 = pr2->pr_path; 4176 if (!strcmp(path1, "/")) 4177 return (path2); 4178 len1 = strlen(path1); 4179 if (strncmp(path1, path2, len1)) 4180 return (path2); 4181 if (path2[len1] == '\0') 4182 return "/"; 4183 if (path2[len1] == '/') 4184 return (path2 + len1); 4185 return (path2); 4186 } 4187 4188 /* 4189 * Jail-related sysctls. 4190 */ 4191 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 4192 "Jails"); 4193 4194 #if defined(INET) || defined(INET6) 4195 /* 4196 * Copy address array to memory that would be then SYSCTL_OUT-ed. 4197 * sysctl_jail_list() helper. 4198 */ 4199 static void 4200 prison_ip_copyout(struct prison *pr, const pr_family_t af, void **out, int *len) 4201 { 4202 const struct prison_ip *pip; 4203 const size_t size = pr_families[af].size; 4204 4205 again: 4206 mtx_assert(&pr->pr_mtx, MA_OWNED); 4207 if ((pip = pr->pr_addrs[af]) != NULL) { 4208 if (*len < pip->ips) { 4209 *len = pip->ips; 4210 mtx_unlock(&pr->pr_mtx); 4211 *out = realloc(*out, *len * size, M_TEMP, M_WAITOK); 4212 mtx_lock(&pr->pr_mtx); 4213 goto again; 4214 } 4215 bcopy(pip->pr_ip, *out, pip->ips * size); 4216 } 4217 } 4218 #endif 4219 4220 static int 4221 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4222 { 4223 struct xprison *xp; 4224 struct prison *pr, *cpr; 4225 #ifdef INET 4226 struct in_addr *ip4 = NULL; 4227 int ip4s = 0; 4228 #endif 4229 #ifdef INET6 4230 struct in6_addr *ip6 = NULL; 4231 int ip6s = 0; 4232 #endif 4233 int descend, error; 4234 4235 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4236 pr = req->td->td_ucred->cr_prison; 4237 error = 0; 4238 sx_slock(&allprison_lock); 4239 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4240 mtx_lock(&cpr->pr_mtx); 4241 #ifdef INET 4242 prison_ip_copyout(cpr, PR_INET, (void **)&ip4, &ip4s); 4243 #endif 4244 #ifdef INET6 4245 prison_ip_copyout(cpr, PR_INET6, (void **)&ip6, &ip6s); 4246 #endif 4247 bzero(xp, sizeof(*xp)); 4248 xp->pr_version = XPRISON_VERSION; 4249 xp->pr_id = cpr->pr_id; 4250 xp->pr_state = cpr->pr_state; 4251 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4252 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4253 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4254 #ifdef INET 4255 xp->pr_ip4s = ip4s; 4256 #endif 4257 #ifdef INET6 4258 xp->pr_ip6s = ip6s; 4259 #endif 4260 mtx_unlock(&cpr->pr_mtx); 4261 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4262 if (error) 4263 break; 4264 #ifdef INET 4265 if (xp->pr_ip4s > 0) { 4266 error = SYSCTL_OUT(req, ip4, 4267 xp->pr_ip4s * sizeof(struct in_addr)); 4268 if (error) 4269 break; 4270 } 4271 #endif 4272 #ifdef INET6 4273 if (xp->pr_ip6s > 0) { 4274 error = SYSCTL_OUT(req, ip6, 4275 xp->pr_ip6s * sizeof(struct in6_addr)); 4276 if (error) 4277 break; 4278 } 4279 #endif 4280 } 4281 sx_sunlock(&allprison_lock); 4282 free(xp, M_TEMP); 4283 #ifdef INET 4284 free(ip4, M_TEMP); 4285 #endif 4286 #ifdef INET6 4287 free(ip6, M_TEMP); 4288 #endif 4289 return (error); 4290 } 4291 4292 SYSCTL_OID(_security_jail, OID_AUTO, list, 4293 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4294 sysctl_jail_list, "S", "List of active jails"); 4295 4296 static int 4297 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4298 { 4299 int error, injail; 4300 4301 injail = jailed(req->td->td_ucred); 4302 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4303 4304 return (error); 4305 } 4306 4307 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4308 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4309 sysctl_jail_jailed, "I", "Process in jail?"); 4310 4311 static int 4312 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4313 { 4314 int error, havevnet; 4315 #ifdef VIMAGE 4316 struct ucred *cred = req->td->td_ucred; 4317 4318 havevnet = jailed(cred) && prison_owns_vnet(cred); 4319 #else 4320 havevnet = 0; 4321 #endif 4322 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4323 4324 return (error); 4325 } 4326 4327 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4328 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4329 sysctl_jail_vnet, "I", "Jail owns vnet?"); 4330 4331 #if defined(INET) || defined(INET6) 4332 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4333 &jail_max_af_ips, 0, 4334 "Number of IP addresses a jail may have at most per address family (deprecated)"); 4335 #endif 4336 4337 /* 4338 * Default parameters for jail(2) compatibility. For historical reasons, 4339 * the sysctl names have varying similarity to the parameter names. Prisons 4340 * just see their own parameters, and can't change them. 4341 */ 4342 static int 4343 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4344 { 4345 int error, i; 4346 4347 /* Get the current flag value, and convert it to a boolean. */ 4348 if (req->td->td_ucred->cr_prison == &prison0) { 4349 mtx_lock(&prison0.pr_mtx); 4350 i = (jail_default_allow & arg2) != 0; 4351 mtx_unlock(&prison0.pr_mtx); 4352 } else 4353 i = prison_allow(req->td->td_ucred, arg2); 4354 4355 if (arg1 != NULL) 4356 i = !i; 4357 error = sysctl_handle_int(oidp, &i, 0, req); 4358 if (error || !req->newptr) 4359 return (error); 4360 i = i ? arg2 : 0; 4361 if (arg1 != NULL) 4362 i ^= arg2; 4363 /* 4364 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4365 * for writing. 4366 */ 4367 mtx_lock(&prison0.pr_mtx); 4368 jail_default_allow = (jail_default_allow & ~arg2) | i; 4369 mtx_unlock(&prison0.pr_mtx); 4370 return (0); 4371 } 4372 4373 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4374 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4375 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4376 "Processes in jail can set their hostnames (deprecated)"); 4377 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4378 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4379 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4380 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 4381 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4382 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4383 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4384 "Processes in jail can use System V IPC primitives (deprecated)"); 4385 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4386 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4387 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4388 "Prison root can create raw sockets (deprecated)"); 4389 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4390 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4391 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4392 "Processes in jail can alter system file flags (deprecated)"); 4393 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4394 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4395 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4396 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 4397 4398 static int 4399 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4400 { 4401 struct prison *pr; 4402 int level, error; 4403 4404 pr = req->td->td_ucred->cr_prison; 4405 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4406 error = sysctl_handle_int(oidp, &level, 0, req); 4407 if (error || !req->newptr) 4408 return (error); 4409 *(int *)arg1 = level; 4410 return (0); 4411 } 4412 4413 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4414 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4415 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4416 sysctl_jail_default_level, "I", 4417 "Processes in jail cannot see all mounted file systems (deprecated)"); 4418 4419 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4420 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4421 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4422 sysctl_jail_default_level, "I", 4423 "Ruleset for the devfs filesystem in jail (deprecated)"); 4424 4425 /* 4426 * Nodes to describe jail parameters. Maximum length of string parameters 4427 * is returned in the string itself, and the other parameters exist merely 4428 * to make themselves and their types known. 4429 */ 4430 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 4431 "Jail parameters"); 4432 4433 int 4434 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4435 { 4436 int i; 4437 long l; 4438 size_t s; 4439 char numbuf[12]; 4440 4441 switch (oidp->oid_kind & CTLTYPE) 4442 { 4443 case CTLTYPE_LONG: 4444 case CTLTYPE_ULONG: 4445 l = 0; 4446 #ifdef SCTL_MASK32 4447 if (!(req->flags & SCTL_MASK32)) 4448 #endif 4449 return (SYSCTL_OUT(req, &l, sizeof(l))); 4450 case CTLTYPE_INT: 4451 case CTLTYPE_UINT: 4452 i = 0; 4453 return (SYSCTL_OUT(req, &i, sizeof(i))); 4454 case CTLTYPE_STRING: 4455 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4456 return 4457 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4458 case CTLTYPE_STRUCT: 4459 s = (size_t)arg2; 4460 return (SYSCTL_OUT(req, &s, sizeof(s))); 4461 } 4462 return (0); 4463 } 4464 4465 /* 4466 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 4467 * jail creation time but cannot be changed in an existing jail. 4468 */ 4469 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4470 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4471 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4472 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4473 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4474 "I", "Jail secure level"); 4475 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 4476 "Jail value for kern.osreldate and uname -K"); 4477 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 4478 "Jail value for kern.osrelease and uname -r"); 4479 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4480 "I", "Jail cannot see all mounted file systems"); 4481 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4482 "I", "Ruleset for in-jail devfs mounts"); 4483 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4484 "B", "Jail persistence"); 4485 #ifdef VIMAGE 4486 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4487 "E,jailsys", "Virtual network stack"); 4488 #endif 4489 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4490 "B", "Jail is in the process of shutting down"); 4491 4492 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4493 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4494 "I", "Current number of child jails"); 4495 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4496 "I", "Maximum number of child jails"); 4497 4498 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4499 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4500 "Jail hostname"); 4501 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4502 "Jail NIS domainname"); 4503 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4504 "Jail host UUID"); 4505 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4506 "LU", "Jail host ID"); 4507 4508 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4509 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4510 4511 #ifdef INET 4512 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4513 "Jail IPv4 address virtualization"); 4514 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4515 "S,in_addr,a", "Jail IPv4 addresses"); 4516 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4517 "B", "Do (not) use IPv4 source address selection rather than the " 4518 "primary jail IPv4 address."); 4519 #endif 4520 #ifdef INET6 4521 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4522 "Jail IPv6 address virtualization"); 4523 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4524 "S,in6_addr,a", "Jail IPv6 addresses"); 4525 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4526 "B", "Do (not) use IPv6 source address selection rather than the " 4527 "primary jail IPv6 address."); 4528 #endif 4529 4530 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4531 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4532 "B", "Jail may set hostname"); 4533 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4534 "B", "Jail may use SYSV IPC"); 4535 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4536 "B", "Jail may create raw sockets"); 4537 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4538 "B", "Jail may alter system file flags"); 4539 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4540 "B", "Jail may set file quotas"); 4541 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4542 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4543 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW, 4544 "B", "Jail may lock (unlock) physical pages in memory"); 4545 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW, 4546 "B", "Jail may bind sockets to reserved ports"); 4547 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW, 4548 "B", "Jail may read the kernel message buffer"); 4549 SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW, 4550 "B", "Unprivileged processes may use process debugging facilities"); 4551 SYSCTL_JAIL_PARAM(_allow, suser, CTLTYPE_INT | CTLFLAG_RW, 4552 "B", "Processes in jail with uid 0 have privilege"); 4553 #ifdef VIMAGE 4554 SYSCTL_JAIL_PARAM(_allow, nfsd, CTLTYPE_INT | CTLFLAG_RW, 4555 "B", "Mountd/nfsd may run in the jail"); 4556 #endif 4557 4558 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4559 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4560 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4561 4562 /* 4563 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return 4564 * its associated bit in the pr_allow bitmask, or zero if the parameter was 4565 * not created. 4566 */ 4567 unsigned 4568 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr, 4569 const char *descr) 4570 { 4571 struct bool_flags *bf; 4572 struct sysctl_oid *parent; 4573 char *allow_name, *allow_noname, *allowed; 4574 #ifndef NO_SYSCTL_DESCR 4575 char *descr_deprecated; 4576 #endif 4577 u_int allow_flag; 4578 4579 if (prefix 4580 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name) 4581 < 0 || 4582 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name) 4583 < 0 4584 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 || 4585 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) { 4586 free(allow_name, M_PRISON); 4587 return 0; 4588 } 4589 4590 /* 4591 * See if this parameter has already beed added, i.e. a module was 4592 * previously loaded/unloaded. 4593 */ 4594 mtx_lock(&prison0.pr_mtx); 4595 for (bf = pr_flag_allow; 4596 bf < pr_flag_allow + nitems(pr_flag_allow) && 4597 atomic_load_int(&bf->flag) != 0; 4598 bf++) { 4599 if (strcmp(bf->name, allow_name) == 0) { 4600 allow_flag = bf->flag; 4601 goto no_add; 4602 } 4603 } 4604 4605 /* 4606 * Find a free bit in pr_allow_all, failing if there are none 4607 * (which shouldn't happen as long as we keep track of how many 4608 * potential dynamic flags exist). 4609 */ 4610 for (allow_flag = 1;; allow_flag <<= 1) { 4611 if (allow_flag == 0) 4612 goto no_add; 4613 if ((pr_allow_all & allow_flag) == 0) 4614 break; 4615 } 4616 4617 /* Note the parameter in the next open slot in pr_flag_allow. */ 4618 for (bf = pr_flag_allow; ; bf++) { 4619 if (bf == pr_flag_allow + nitems(pr_flag_allow)) { 4620 /* This should never happen, but is not fatal. */ 4621 allow_flag = 0; 4622 goto no_add; 4623 } 4624 if (atomic_load_int(&bf->flag) == 0) 4625 break; 4626 } 4627 bf->name = allow_name; 4628 bf->noname = allow_noname; 4629 pr_allow_all |= allow_flag; 4630 /* 4631 * prison0 always has permission for the new parameter. 4632 * Other jails must have it granted to them. 4633 */ 4634 prison0.pr_allow |= allow_flag; 4635 /* The flag indicates a valid entry, so make sure it is set last. */ 4636 atomic_store_rel_int(&bf->flag, allow_flag); 4637 mtx_unlock(&prison0.pr_mtx); 4638 4639 /* 4640 * Create sysctls for the parameter, and the back-compat global 4641 * permission. 4642 */ 4643 parent = prefix 4644 ? SYSCTL_ADD_NODE(NULL, 4645 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow), 4646 OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr) 4647 : &sysctl___security_jail_param_allow; 4648 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO, 4649 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4650 NULL, 0, sysctl_jail_param, "B", descr); 4651 if ((prefix 4652 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name) 4653 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) { 4654 #ifndef NO_SYSCTL_DESCR 4655 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)", 4656 descr); 4657 #endif 4658 (void)SYSCTL_ADD_PROC(NULL, 4659 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed, 4660 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag, 4661 sysctl_jail_default_allow, "I", descr_deprecated); 4662 #ifndef NO_SYSCTL_DESCR 4663 free(descr_deprecated, M_TEMP); 4664 #endif 4665 free(allowed, M_TEMP); 4666 } 4667 return allow_flag; 4668 4669 no_add: 4670 mtx_unlock(&prison0.pr_mtx); 4671 free(allow_name, M_PRISON); 4672 free(allow_noname, M_PRISON); 4673 return allow_flag; 4674 } 4675 4676 /* 4677 * The VFS system will register jail-aware filesystems here. They each get 4678 * a parameter allow.mount.xxxfs and a flag to check when a jailed user 4679 * attempts to mount. 4680 */ 4681 void 4682 prison_add_vfs(struct vfsconf *vfsp) 4683 { 4684 #ifdef NO_SYSCTL_DESCR 4685 4686 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 4687 NULL, NULL); 4688 #else 4689 char *descr; 4690 4691 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system", 4692 vfsp->vfc_name); 4693 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 4694 NULL, descr); 4695 free(descr, M_TEMP); 4696 #endif 4697 } 4698 4699 #ifdef RACCT 4700 void 4701 prison_racct_foreach(void (*callback)(struct racct *racct, 4702 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 4703 void *arg2, void *arg3) 4704 { 4705 struct prison_racct *prr; 4706 4707 ASSERT_RACCT_ENABLED(); 4708 4709 sx_slock(&allprison_lock); 4710 if (pre != NULL) 4711 (pre)(); 4712 LIST_FOREACH(prr, &allprison_racct, prr_next) 4713 (callback)(prr->prr_racct, arg2, arg3); 4714 if (post != NULL) 4715 (post)(); 4716 sx_sunlock(&allprison_lock); 4717 } 4718 4719 static struct prison_racct * 4720 prison_racct_find_locked(const char *name) 4721 { 4722 struct prison_racct *prr; 4723 4724 ASSERT_RACCT_ENABLED(); 4725 sx_assert(&allprison_lock, SA_XLOCKED); 4726 4727 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4728 return (NULL); 4729 4730 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4731 if (strcmp(name, prr->prr_name) != 0) 4732 continue; 4733 4734 /* Found prison_racct with a matching name? */ 4735 prison_racct_hold(prr); 4736 return (prr); 4737 } 4738 4739 /* Add new prison_racct. */ 4740 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4741 racct_create(&prr->prr_racct); 4742 4743 strcpy(prr->prr_name, name); 4744 refcount_init(&prr->prr_refcount, 1); 4745 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4746 4747 return (prr); 4748 } 4749 4750 struct prison_racct * 4751 prison_racct_find(const char *name) 4752 { 4753 struct prison_racct *prr; 4754 4755 ASSERT_RACCT_ENABLED(); 4756 4757 sx_xlock(&allprison_lock); 4758 prr = prison_racct_find_locked(name); 4759 sx_xunlock(&allprison_lock); 4760 return (prr); 4761 } 4762 4763 void 4764 prison_racct_hold(struct prison_racct *prr) 4765 { 4766 4767 ASSERT_RACCT_ENABLED(); 4768 4769 refcount_acquire(&prr->prr_refcount); 4770 } 4771 4772 static void 4773 prison_racct_free_locked(struct prison_racct *prr) 4774 { 4775 4776 ASSERT_RACCT_ENABLED(); 4777 sx_assert(&allprison_lock, SA_XLOCKED); 4778 4779 if (refcount_release(&prr->prr_refcount)) { 4780 racct_destroy(&prr->prr_racct); 4781 LIST_REMOVE(prr, prr_next); 4782 free(prr, M_PRISON_RACCT); 4783 } 4784 } 4785 4786 void 4787 prison_racct_free(struct prison_racct *prr) 4788 { 4789 4790 ASSERT_RACCT_ENABLED(); 4791 sx_assert(&allprison_lock, SA_UNLOCKED); 4792 4793 if (refcount_release_if_not_last(&prr->prr_refcount)) 4794 return; 4795 4796 sx_xlock(&allprison_lock); 4797 prison_racct_free_locked(prr); 4798 sx_xunlock(&allprison_lock); 4799 } 4800 4801 static void 4802 prison_racct_attach(struct prison *pr) 4803 { 4804 struct prison_racct *prr; 4805 4806 ASSERT_RACCT_ENABLED(); 4807 sx_assert(&allprison_lock, SA_XLOCKED); 4808 4809 prr = prison_racct_find_locked(pr->pr_name); 4810 KASSERT(prr != NULL, ("cannot find prison_racct")); 4811 4812 pr->pr_prison_racct = prr; 4813 } 4814 4815 /* 4816 * Handle jail renaming. From the racct point of view, renaming means 4817 * moving from one prison_racct to another. 4818 */ 4819 static void 4820 prison_racct_modify(struct prison *pr) 4821 { 4822 #ifdef RCTL 4823 struct proc *p; 4824 struct ucred *cred; 4825 #endif 4826 struct prison_racct *oldprr; 4827 4828 ASSERT_RACCT_ENABLED(); 4829 4830 sx_slock(&allproc_lock); 4831 sx_xlock(&allprison_lock); 4832 4833 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4834 sx_xunlock(&allprison_lock); 4835 sx_sunlock(&allproc_lock); 4836 return; 4837 } 4838 4839 oldprr = pr->pr_prison_racct; 4840 pr->pr_prison_racct = NULL; 4841 4842 prison_racct_attach(pr); 4843 4844 /* 4845 * Move resource utilisation records. 4846 */ 4847 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4848 4849 #ifdef RCTL 4850 /* 4851 * Force rctl to reattach rules to processes. 4852 */ 4853 FOREACH_PROC_IN_SYSTEM(p) { 4854 PROC_LOCK(p); 4855 cred = crhold(p->p_ucred); 4856 PROC_UNLOCK(p); 4857 rctl_proc_ucred_changed(p, cred); 4858 crfree(cred); 4859 } 4860 #endif 4861 4862 sx_sunlock(&allproc_lock); 4863 prison_racct_free_locked(oldprr); 4864 sx_xunlock(&allprison_lock); 4865 } 4866 4867 static void 4868 prison_racct_detach(struct prison *pr) 4869 { 4870 4871 ASSERT_RACCT_ENABLED(); 4872 sx_assert(&allprison_lock, SA_UNLOCKED); 4873 4874 if (pr->pr_prison_racct == NULL) 4875 return; 4876 prison_racct_free(pr->pr_prison_racct); 4877 pr->pr_prison_racct = NULL; 4878 } 4879 #endif /* RACCT */ 4880 4881 #ifdef DDB 4882 4883 static void 4884 db_show_prison(struct prison *pr) 4885 { 4886 struct bool_flags *bf; 4887 struct jailsys_flags *jsf; 4888 #if defined(INET) || defined(INET6) 4889 int ii; 4890 struct prison_ip *pip; 4891 #endif 4892 unsigned f; 4893 #ifdef INET 4894 char ip4buf[INET_ADDRSTRLEN]; 4895 #endif 4896 #ifdef INET6 4897 char ip6buf[INET6_ADDRSTRLEN]; 4898 #endif 4899 4900 db_printf("prison %p:\n", pr); 4901 db_printf(" jid = %d\n", pr->pr_id); 4902 db_printf(" name = %s\n", pr->pr_name); 4903 db_printf(" parent = %p\n", pr->pr_parent); 4904 db_printf(" ref = %d\n", pr->pr_ref); 4905 db_printf(" uref = %d\n", pr->pr_uref); 4906 db_printf(" state = %s\n", 4907 pr->pr_state == PRISON_STATE_ALIVE ? "alive" : 4908 pr->pr_state == PRISON_STATE_DYING ? "dying" : 4909 "invalid"); 4910 db_printf(" path = %s\n", pr->pr_path); 4911 db_printf(" cpuset = %d\n", pr->pr_cpuset 4912 ? pr->pr_cpuset->cs_id : -1); 4913 #ifdef VIMAGE 4914 db_printf(" vnet = %p\n", pr->pr_vnet); 4915 #endif 4916 db_printf(" root = %p\n", pr->pr_root); 4917 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4918 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4919 db_printf(" children.max = %d\n", pr->pr_childmax); 4920 db_printf(" children.cur = %d\n", pr->pr_childcount); 4921 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4922 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4923 db_printf(" flags = 0x%x", pr->pr_flags); 4924 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++) 4925 if (pr->pr_flags & bf->flag) 4926 db_printf(" %s", bf->name); 4927 for (jsf = pr_flag_jailsys; 4928 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 4929 jsf++) { 4930 f = pr->pr_flags & (jsf->disable | jsf->new); 4931 db_printf(" %-16s= %s\n", jsf->name, 4932 (f != 0 && f == jsf->disable) ? "disable" 4933 : (f == jsf->new) ? "new" 4934 : "inherit"); 4935 } 4936 db_printf(" allow = 0x%x", pr->pr_allow); 4937 for (bf = pr_flag_allow; 4938 bf < pr_flag_allow + nitems(pr_flag_allow) && 4939 atomic_load_int(&bf->flag) != 0; 4940 bf++) 4941 if (pr->pr_allow & bf->flag) 4942 db_printf(" %s", bf->name); 4943 db_printf("\n"); 4944 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4945 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4946 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4947 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4948 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4949 #ifdef INET 4950 if ((pip = pr->pr_addrs[PR_INET]) != NULL) { 4951 db_printf(" ip4s = %d\n", pip->ips); 4952 for (ii = 0; ii < pip->ips; ii++) 4953 db_printf(" %s %s\n", 4954 ii == 0 ? "ip4.addr =" : " ", 4955 inet_ntoa_r( 4956 *(const struct in_addr *)PR_IP(pip, PR_INET, ii), 4957 ip4buf)); 4958 } 4959 #endif 4960 #ifdef INET6 4961 if ((pip = pr->pr_addrs[PR_INET6]) != NULL) { 4962 db_printf(" ip6s = %d\n", pip->ips); 4963 for (ii = 0; ii < pip->ips; ii++) 4964 db_printf(" %s %s\n", 4965 ii == 0 ? "ip6.addr =" : " ", 4966 ip6_sprintf(ip6buf, 4967 (const struct in6_addr *)PR_IP(pip, PR_INET6, ii))); 4968 } 4969 #endif 4970 } 4971 4972 DB_SHOW_COMMAND(prison, db_show_prison_command) 4973 { 4974 struct prison *pr; 4975 4976 if (!have_addr) { 4977 /* 4978 * Show all prisons in the list, and prison0 which is not 4979 * listed. 4980 */ 4981 db_show_prison(&prison0); 4982 if (!db_pager_quit) { 4983 TAILQ_FOREACH(pr, &allprison, pr_list) { 4984 db_show_prison(pr); 4985 if (db_pager_quit) 4986 break; 4987 } 4988 } 4989 return; 4990 } 4991 4992 if (addr == 0) 4993 pr = &prison0; 4994 else { 4995 /* Look for a prison with the ID and with references. */ 4996 TAILQ_FOREACH(pr, &allprison, pr_list) 4997 if (pr->pr_id == addr && pr->pr_ref > 0) 4998 break; 4999 if (pr == NULL) 5000 /* Look again, without requiring a reference. */ 5001 TAILQ_FOREACH(pr, &allprison, pr_list) 5002 if (pr->pr_id == addr) 5003 break; 5004 if (pr == NULL) 5005 /* Assume address points to a valid prison. */ 5006 pr = (struct prison *)addr; 5007 } 5008 db_show_prison(pr); 5009 } 5010 5011 #endif /* DDB */ 5012