1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1999 Poul-Henning Kamp. 5 * Copyright (c) 2008 Bjoern A. Zeeb. 6 * Copyright (c) 2009 James Gritton. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 #include "opt_ddb.h" 33 #include "opt_inet.h" 34 #include "opt_inet6.h" 35 #include "opt_nfs.h" 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/kernel.h> 40 #include <sys/systm.h> 41 #include <sys/errno.h> 42 #include <sys/sysproto.h> 43 #include <sys/malloc.h> 44 #include <sys/osd.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/epoch.h> 48 #include <sys/taskqueue.h> 49 #include <sys/fcntl.h> 50 #include <sys/jail.h> 51 #include <sys/linker.h> 52 #include <sys/lock.h> 53 #include <sys/mman.h> 54 #include <sys/mutex.h> 55 #include <sys/racct.h> 56 #include <sys/rctl.h> 57 #include <sys/refcount.h> 58 #include <sys/sx.h> 59 #include <sys/sysent.h> 60 #include <sys/namei.h> 61 #include <sys/mount.h> 62 #include <sys/queue.h> 63 #include <sys/socket.h> 64 #include <sys/syscallsubr.h> 65 #include <sys/sysctl.h> 66 #include <sys/uuid.h> 67 #include <sys/vnode.h> 68 69 #include <net/if.h> 70 #include <net/vnet.h> 71 72 #include <netinet/in.h> 73 74 #ifdef DDB 75 #include <ddb/ddb.h> 76 #endif /* DDB */ 77 78 #include <security/mac/mac_framework.h> 79 80 #define PRISON0_HOSTUUID_MODULE "hostuuid" 81 82 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 83 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 84 85 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 86 #ifdef INET 87 #ifdef INET6 88 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 89 #else 90 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 91 #endif 92 #else /* !INET */ 93 #ifdef INET6 94 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 95 #else 96 #define _PR_IP_SADDRSEL 0 97 #endif 98 #endif 99 100 /* prison0 describes what is "real" about the system. */ 101 struct prison prison0 = { 102 .pr_id = 0, 103 .pr_name = "0", 104 .pr_ref = 1, 105 .pr_uref = 1, 106 .pr_path = "/", 107 .pr_securelevel = -1, 108 .pr_devfs_rsnum = 0, 109 .pr_state = PRISON_STATE_ALIVE, 110 .pr_childmax = JAIL_MAX, 111 .pr_hostuuid = DEFAULT_HOSTUUID, 112 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 113 #ifdef VIMAGE 114 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 115 #else 116 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 117 #endif 118 .pr_allow = PR_ALLOW_ALL_STATIC, 119 }; 120 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 121 122 struct bool_flags { 123 const char *name; 124 const char *noname; 125 volatile u_int flag; 126 }; 127 struct jailsys_flags { 128 const char *name; 129 unsigned disable; 130 unsigned new; 131 }; 132 133 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 134 struct sx allprison_lock; 135 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 136 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 137 LIST_HEAD(, prison_racct) allprison_racct; 138 int lastprid = 0; 139 140 static int get_next_prid(struct prison **insprp); 141 static int do_jail_attach(struct thread *td, struct prison *pr, int drflags); 142 static void prison_complete(void *context, int pending); 143 static void prison_deref(struct prison *pr, int flags); 144 static void prison_deref_kill(struct prison *pr, struct prisonlist *freeprison); 145 static int prison_lock_xlock(struct prison *pr, int flags); 146 static void prison_cleanup(struct prison *pr); 147 static void prison_free_not_last(struct prison *pr); 148 static void prison_proc_free_not_last(struct prison *pr); 149 static void prison_proc_relink(struct prison *opr, struct prison *npr, 150 struct proc *p); 151 static void prison_set_allow_locked(struct prison *pr, unsigned flag, 152 int enable); 153 static char *prison_path(struct prison *pr1, struct prison *pr2); 154 #ifdef RACCT 155 static void prison_racct_attach(struct prison *pr); 156 static void prison_racct_modify(struct prison *pr); 157 static void prison_racct_detach(struct prison *pr); 158 #endif 159 160 /* Flags for prison_deref */ 161 #define PD_DEREF 0x01 /* Decrement pr_ref */ 162 #define PD_DEUREF 0x02 /* Decrement pr_uref */ 163 #define PD_KILL 0x04 /* Remove jail, kill processes, etc */ 164 #define PD_LOCKED 0x10 /* pr_mtx is held */ 165 #define PD_LIST_SLOCKED 0x20 /* allprison_lock is held shared */ 166 #define PD_LIST_XLOCKED 0x40 /* allprison_lock is held exclusive */ 167 #define PD_OP_FLAGS 0x07 /* Operation flags */ 168 #define PD_LOCK_FLAGS 0x70 /* Lock status flags */ 169 170 /* 171 * Parameter names corresponding to PR_* flag values. Size values are for kvm 172 * as we cannot figure out the size of a sparse array, or an array without a 173 * terminating entry. 174 */ 175 static struct bool_flags pr_flag_bool[] = { 176 {"persist", "nopersist", PR_PERSIST}, 177 #ifdef INET 178 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL}, 179 #endif 180 #ifdef INET6 181 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL}, 182 #endif 183 }; 184 const size_t pr_flag_bool_size = sizeof(pr_flag_bool); 185 186 static struct jailsys_flags pr_flag_jailsys[] = { 187 {"host", 0, PR_HOST}, 188 #ifdef VIMAGE 189 {"vnet", 0, PR_VNET}, 190 #endif 191 #ifdef INET 192 {"ip4", PR_IP4_USER, PR_IP4_USER}, 193 #endif 194 #ifdef INET6 195 {"ip6", PR_IP6_USER, PR_IP6_USER}, 196 #endif 197 }; 198 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 199 200 /* 201 * Make this array full-size so dynamic parameters can be added. 202 * It is protected by prison0.mtx, but lockless reading is allowed 203 * with an atomic check of the flag values. 204 */ 205 static struct bool_flags pr_flag_allow[NBBY * NBPW] = { 206 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME}, 207 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC}, 208 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS}, 209 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS}, 210 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT}, 211 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS}, 212 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF}, 213 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK}, 214 {"allow.reserved_ports", "allow.noreserved_ports", 215 PR_ALLOW_RESERVED_PORTS}, 216 {"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF}, 217 {"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug", 218 PR_ALLOW_UNPRIV_DEBUG}, 219 {"allow.suser", "allow.nosuser", PR_ALLOW_SUSER}, 220 #ifdef VIMAGE 221 {"allow.nfsd", "allow.nonfsd", PR_ALLOW_NFSD}, 222 #endif 223 {"allow.extattr", "allow.noextattr", PR_ALLOW_EXTATTR}, 224 }; 225 static unsigned pr_allow_all = PR_ALLOW_ALL_STATIC; 226 const size_t pr_flag_allow_size = sizeof(pr_flag_allow); 227 228 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \ 229 PR_ALLOW_RESERVED_PORTS | \ 230 PR_ALLOW_UNPRIV_DEBUG | \ 231 PR_ALLOW_SUSER) 232 #define JAIL_DEFAULT_ENFORCE_STATFS 2 233 #define JAIL_DEFAULT_DEVFS_RSNUM 0 234 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 235 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 236 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 237 #if defined(INET) || defined(INET6) 238 static unsigned jail_max_af_ips = 255; 239 #endif 240 241 /* 242 * Initialize the parts of prison0 that can't be static-initialized with 243 * constants. This is called from proc0_init() after creating thread0 cpuset. 244 */ 245 void 246 prison0_init(void) 247 { 248 uint8_t *file, *data; 249 size_t size; 250 char buf[sizeof(prison0.pr_hostuuid)]; 251 bool valid; 252 253 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 254 prison0.pr_osreldate = osreldate; 255 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 256 257 /* If we have a preloaded hostuuid, use it. */ 258 file = preload_search_by_type(PRISON0_HOSTUUID_MODULE); 259 if (file != NULL) { 260 data = preload_fetch_addr(file); 261 size = preload_fetch_size(file); 262 if (data != NULL) { 263 /* 264 * The preloaded data may include trailing whitespace, almost 265 * certainly a newline; skip over any whitespace or 266 * non-printable characters to be safe. 267 */ 268 while (size > 0 && data[size - 1] <= 0x20) { 269 size--; 270 } 271 272 valid = false; 273 274 /* 275 * Not NUL-terminated when passed from loader, but 276 * validate_uuid requires that due to using sscanf (as 277 * does the subsequent strlcpy, since it still reads 278 * past the given size to return the true length); 279 * bounce to a temporary buffer to fix. 280 */ 281 if (size >= sizeof(buf)) 282 goto done; 283 284 memcpy(buf, data, size); 285 buf[size] = '\0'; 286 287 if (validate_uuid(buf, size, NULL, 0) != 0) 288 goto done; 289 290 valid = true; 291 (void)strlcpy(prison0.pr_hostuuid, buf, 292 sizeof(prison0.pr_hostuuid)); 293 294 done: 295 if (bootverbose && !valid) { 296 printf("hostuuid: preload data malformed: '%.*s'\n", 297 (int)size, data); 298 } 299 } 300 } 301 if (bootverbose) 302 printf("hostuuid: using %s\n", prison0.pr_hostuuid); 303 } 304 305 /* 306 * struct jail_args { 307 * struct jail *jail; 308 * }; 309 */ 310 int 311 sys_jail(struct thread *td, struct jail_args *uap) 312 { 313 uint32_t version; 314 int error; 315 struct jail j; 316 317 error = copyin(uap->jail, &version, sizeof(uint32_t)); 318 if (error) 319 return (error); 320 321 switch (version) { 322 case 0: 323 { 324 struct jail_v0 j0; 325 326 /* FreeBSD single IPv4 jails. */ 327 bzero(&j, sizeof(struct jail)); 328 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 329 if (error) 330 return (error); 331 j.version = j0.version; 332 j.path = j0.path; 333 j.hostname = j0.hostname; 334 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 335 break; 336 } 337 338 case 1: 339 /* 340 * Version 1 was used by multi-IPv4 jail implementations 341 * that never made it into the official kernel. 342 */ 343 return (EINVAL); 344 345 case 2: /* JAIL_API_VERSION */ 346 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 347 error = copyin(uap->jail, &j, sizeof(struct jail)); 348 if (error) 349 return (error); 350 break; 351 352 default: 353 /* Sci-Fi jails are not supported, sorry. */ 354 return (EINVAL); 355 } 356 return (kern_jail(td, &j)); 357 } 358 359 int 360 kern_jail(struct thread *td, struct jail *j) 361 { 362 struct iovec optiov[2 * (4 + nitems(pr_flag_allow) 363 #ifdef INET 364 + 1 365 #endif 366 #ifdef INET6 367 + 1 368 #endif 369 )]; 370 struct uio opt; 371 char *u_path, *u_hostname, *u_name; 372 struct bool_flags *bf; 373 #ifdef INET 374 uint32_t ip4s; 375 struct in_addr *u_ip4; 376 #endif 377 #ifdef INET6 378 struct in6_addr *u_ip6; 379 #endif 380 size_t tmplen; 381 int error, enforce_statfs; 382 383 bzero(&optiov, sizeof(optiov)); 384 opt.uio_iov = optiov; 385 opt.uio_iovcnt = 0; 386 opt.uio_offset = -1; 387 opt.uio_resid = -1; 388 opt.uio_segflg = UIO_SYSSPACE; 389 opt.uio_rw = UIO_READ; 390 opt.uio_td = td; 391 392 /* Set permissions for top-level jails from sysctls. */ 393 if (!jailed(td->td_ucred)) { 394 for (bf = pr_flag_allow; 395 bf < pr_flag_allow + nitems(pr_flag_allow) && 396 atomic_load_int(&bf->flag) != 0; 397 bf++) { 398 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *, 399 (jail_default_allow & bf->flag) 400 ? bf->name : bf->noname); 401 optiov[opt.uio_iovcnt].iov_len = 402 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 403 opt.uio_iovcnt += 2; 404 } 405 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 406 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 407 opt.uio_iovcnt++; 408 enforce_statfs = jail_default_enforce_statfs; 409 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 410 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 411 opt.uio_iovcnt++; 412 } 413 414 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 415 #ifdef INET 416 ip4s = (j->version == 0) ? 1 : j->ip4s; 417 if (ip4s > jail_max_af_ips) 418 return (EINVAL); 419 tmplen += ip4s * sizeof(struct in_addr); 420 #else 421 if (j->ip4s > 0) 422 return (EINVAL); 423 #endif 424 #ifdef INET6 425 if (j->ip6s > jail_max_af_ips) 426 return (EINVAL); 427 tmplen += j->ip6s * sizeof(struct in6_addr); 428 #else 429 if (j->ip6s > 0) 430 return (EINVAL); 431 #endif 432 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 433 u_hostname = u_path + MAXPATHLEN; 434 u_name = u_hostname + MAXHOSTNAMELEN; 435 #ifdef INET 436 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 437 #endif 438 #ifdef INET6 439 #ifdef INET 440 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 441 #else 442 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 443 #endif 444 #endif 445 optiov[opt.uio_iovcnt].iov_base = "path"; 446 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 447 opt.uio_iovcnt++; 448 optiov[opt.uio_iovcnt].iov_base = u_path; 449 error = copyinstr(j->path, u_path, MAXPATHLEN, 450 &optiov[opt.uio_iovcnt].iov_len); 451 if (error) { 452 free(u_path, M_TEMP); 453 return (error); 454 } 455 opt.uio_iovcnt++; 456 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 457 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 458 opt.uio_iovcnt++; 459 optiov[opt.uio_iovcnt].iov_base = u_hostname; 460 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 461 &optiov[opt.uio_iovcnt].iov_len); 462 if (error) { 463 free(u_path, M_TEMP); 464 return (error); 465 } 466 opt.uio_iovcnt++; 467 if (j->jailname != NULL) { 468 optiov[opt.uio_iovcnt].iov_base = "name"; 469 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 470 opt.uio_iovcnt++; 471 optiov[opt.uio_iovcnt].iov_base = u_name; 472 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 473 &optiov[opt.uio_iovcnt].iov_len); 474 if (error) { 475 free(u_path, M_TEMP); 476 return (error); 477 } 478 opt.uio_iovcnt++; 479 } 480 #ifdef INET 481 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 482 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 483 opt.uio_iovcnt++; 484 optiov[opt.uio_iovcnt].iov_base = u_ip4; 485 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 486 if (j->version == 0) 487 u_ip4->s_addr = j->ip4s; 488 else { 489 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 490 if (error) { 491 free(u_path, M_TEMP); 492 return (error); 493 } 494 } 495 opt.uio_iovcnt++; 496 #endif 497 #ifdef INET6 498 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 499 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 500 opt.uio_iovcnt++; 501 optiov[opt.uio_iovcnt].iov_base = u_ip6; 502 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 503 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 504 if (error) { 505 free(u_path, M_TEMP); 506 return (error); 507 } 508 opt.uio_iovcnt++; 509 #endif 510 KASSERT(opt.uio_iovcnt <= nitems(optiov), 511 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 512 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 513 free(u_path, M_TEMP); 514 return (error); 515 } 516 517 /* 518 * struct jail_set_args { 519 * struct iovec *iovp; 520 * unsigned int iovcnt; 521 * int flags; 522 * }; 523 */ 524 int 525 sys_jail_set(struct thread *td, struct jail_set_args *uap) 526 { 527 struct uio *auio; 528 int error; 529 530 /* Check that we have an even number of iovecs. */ 531 if (uap->iovcnt & 1) 532 return (EINVAL); 533 534 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 535 if (error) 536 return (error); 537 error = kern_jail_set(td, auio, uap->flags); 538 free(auio, M_IOV); 539 return (error); 540 } 541 542 #if defined(INET) || defined(INET6) 543 typedef int prison_addr_cmp_t(const void *, const void *); 544 typedef bool prison_addr_valid_t(const void *); 545 static const struct pr_family { 546 size_t size; 547 prison_addr_cmp_t *cmp; 548 prison_addr_valid_t *valid; 549 int ip_flag; 550 } pr_families[PR_FAMILY_MAX] = { 551 #ifdef INET 552 [PR_INET] = { 553 .size = sizeof(struct in_addr), 554 .cmp = prison_qcmp_v4, 555 .valid = prison_valid_v4, 556 .ip_flag = PR_IP4_USER, 557 }, 558 #endif 559 #ifdef INET6 560 [PR_INET6] = { 561 .size = sizeof(struct in6_addr), 562 .cmp = prison_qcmp_v6, 563 .valid = prison_valid_v6, 564 .ip_flag = PR_IP6_USER, 565 }, 566 #endif 567 }; 568 569 /* 570 * Network address lists (pr_addrs) allocation for jails. The addresses 571 * are accessed locklessly by the network stack, thus need to be protected by 572 * the network epoch. 573 */ 574 struct prison_ip { 575 struct epoch_context ctx; 576 uint32_t ips; 577 #ifdef FUTURE_C 578 /* 579 * XXX Variable-length automatic arrays in union may be 580 * supported in future C. 581 */ 582 union { 583 char pr_ip[]; 584 struct in_addr pr_ip4[]; 585 struct in6_addr pr_ip6[]; 586 }; 587 #else /* No future C :( */ 588 char pr_ip[]; 589 #endif 590 }; 591 592 static char * 593 PR_IP(struct prison_ip *pip, const pr_family_t af, int idx) 594 { 595 MPASS(pip); 596 MPASS(af < PR_FAMILY_MAX); 597 MPASS(idx >= 0 && idx < pip->ips); 598 599 return (pip->pr_ip + pr_families[af].size * idx); 600 } 601 602 static struct prison_ip * 603 prison_ip_alloc(const pr_family_t af, uint32_t cnt, int flags) 604 { 605 struct prison_ip *pip; 606 607 pip = malloc(sizeof(struct prison_ip) + cnt * pr_families[af].size, 608 M_PRISON, flags); 609 if (pip != NULL) 610 pip->ips = cnt; 611 return (pip); 612 } 613 614 /* 615 * Allocate and copyin user supplied address list, sorting and validating. 616 * kern_jail_set() helper. 617 */ 618 static struct prison_ip * 619 prison_ip_copyin(const pr_family_t af, void *op, uint32_t cnt) 620 { 621 prison_addr_cmp_t *const cmp = pr_families[af].cmp; 622 const size_t size = pr_families[af].size; 623 struct prison_ip *pip; 624 625 pip = prison_ip_alloc(af, cnt, M_WAITOK); 626 bcopy(op, pip->pr_ip, cnt * size); 627 /* 628 * IP addresses are all sorted but ip[0] to preserve 629 * the primary IP address as given from userland. 630 * This special IP is used for unbound outgoing 631 * connections as well for "loopback" traffic in case 632 * source address selection cannot find any more fitting 633 * address to connect from. 634 */ 635 if (cnt > 1) 636 qsort(PR_IP(pip, af, 1), cnt - 1, size, cmp); 637 /* 638 * Check for duplicate addresses and do some simple 639 * zero and broadcast checks. If users give other bogus 640 * addresses it is their problem. 641 */ 642 for (int i = 0; i < cnt; i++) { 643 if (!pr_families[af].valid(PR_IP(pip, af, i))) { 644 free(pip, M_PRISON); 645 return (NULL); 646 } 647 if (i + 1 < cnt && 648 (cmp(PR_IP(pip, af, 0), PR_IP(pip, af, i + 1)) == 0 || 649 cmp(PR_IP(pip, af, i), PR_IP(pip, af, i + 1)) == 0)) { 650 free(pip, M_PRISON); 651 return (NULL); 652 } 653 } 654 655 return (pip); 656 } 657 658 /* 659 * Allocate and dup parent prison address list. 660 * kern_jail_set() helper. 661 */ 662 static void 663 prison_ip_dup(struct prison *ppr, struct prison *pr, const pr_family_t af) 664 { 665 const struct prison_ip *ppip = ppr->pr_addrs[af]; 666 struct prison_ip *pip; 667 668 if (ppip != NULL) { 669 pip = prison_ip_alloc(af, ppip->ips, M_WAITOK); 670 bcopy(ppip->pr_ip, pip->pr_ip, pip->ips * pr_families[af].size); 671 pr->pr_addrs[af] = pip; 672 } 673 } 674 675 /* 676 * Make sure the new set of IP addresses is a subset of the parent's list. 677 * Don't worry about the parent being unlocked, as any setting is done with 678 * allprison_lock held. 679 * kern_jail_set() helper. 680 */ 681 static bool 682 prison_ip_parent_match(struct prison_ip *ppip, struct prison_ip *pip, 683 const pr_family_t af) 684 { 685 prison_addr_cmp_t *const cmp = pr_families[af].cmp; 686 int i, j; 687 688 if (ppip == NULL) 689 return (false); 690 691 for (i = 0; i < ppip->ips; i++) 692 if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, i)) == 0) 693 break; 694 695 if (i == ppip->ips) 696 /* Main address not present in parent. */ 697 return (false); 698 699 if (pip->ips > 1) { 700 for (i = j = 1; i < pip->ips; i++) { 701 if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0) 702 /* Equals to parent primary address. */ 703 continue; 704 for (; j < ppip->ips; j++) 705 if (cmp(PR_IP(pip, af, i), 706 PR_IP(ppip, af, j)) == 0) 707 break; 708 if (j == ppip->ips) 709 break; 710 } 711 if (j == ppip->ips) 712 /* Address not present in parent. */ 713 return (false); 714 } 715 return (true); 716 } 717 718 /* 719 * Check for conflicting IP addresses. We permit them if there is no more 720 * than one IP on each jail. If there is a duplicate on a jail with more 721 * than one IP stop checking and return error. 722 * kern_jail_set() helper. 723 */ 724 static bool 725 prison_ip_conflict_check(const struct prison *ppr, const struct prison *pr, 726 struct prison_ip *pip, pr_family_t af) 727 { 728 const struct prison *tppr, *tpr; 729 int descend; 730 731 #ifdef VIMAGE 732 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 733 if (tppr->pr_flags & PR_VNET) 734 break; 735 #else 736 tppr = &prison0; 737 #endif 738 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 739 if (tpr == pr || 740 #ifdef VIMAGE 741 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 742 #endif 743 !prison_isalive(tpr)) { 744 descend = 0; 745 continue; 746 } 747 if (!(tpr->pr_flags & pr_families[af].ip_flag)) 748 continue; 749 descend = 0; 750 if (tpr->pr_addrs[af] == NULL || 751 (pip->ips == 1 && tpr->pr_addrs[af]->ips == 1)) 752 continue; 753 for (int i = 0; i < pip->ips; i++) 754 if (prison_ip_check(tpr, af, PR_IP(pip, af, i)) == 0) 755 return (false); 756 } 757 758 return (true); 759 } 760 761 _Static_assert(offsetof(struct prison_ip, ctx) == 0, 762 "prison must start with epoch context"); 763 static void 764 prison_ip_free_deferred(epoch_context_t ctx) 765 { 766 767 free(ctx, M_PRISON); 768 } 769 770 static void 771 prison_ip_free(struct prison_ip *pip) 772 { 773 774 if (pip != NULL) 775 NET_EPOCH_CALL(prison_ip_free_deferred, &pip->ctx); 776 } 777 778 static void 779 prison_ip_set(struct prison *pr, const pr_family_t af, struct prison_ip *new) 780 { 781 struct prison_ip **mem, *old; 782 783 mtx_assert(&pr->pr_mtx, MA_OWNED); 784 785 mem = &pr->pr_addrs[af]; 786 787 old = *mem; 788 atomic_store_ptr(mem, new); 789 prison_ip_free(old); 790 } 791 792 /* 793 * Restrict a prison's IP address list with its parent's, possibly replacing 794 * it. Return true if succeed, otherwise should redo. 795 * kern_jail_set() helper. 796 */ 797 static bool 798 prison_ip_restrict(struct prison *pr, const pr_family_t af, 799 struct prison_ip **newp) 800 { 801 struct prison_ip *ppip = pr->pr_parent->pr_addrs[af]; 802 struct prison_ip *pip = pr->pr_addrs[af]; 803 int (*const cmp)(const void *, const void *) = pr_families[af].cmp; 804 const size_t size = pr_families[af].size; 805 struct prison_ip *new = newp != NULL ? *newp : NULL; 806 uint32_t ips; 807 808 mtx_assert(&pr->pr_mtx, MA_OWNED); 809 810 /* 811 * Due to epoch-synchronized access to the IP address lists we always 812 * allocate a new list even if the old one has enough space. We could 813 * atomically update an IPv4 address inside a list, but that would 814 * screw up sorting, and in case of IPv6 we can't even atomically write 815 * one. 816 */ 817 if (ppip == NULL) { 818 if (pip != NULL) 819 prison_ip_set(pr, af, NULL); 820 return (true); 821 } 822 823 if (!(pr->pr_flags & pr_families[af].ip_flag)) { 824 if (new == NULL) { 825 new = prison_ip_alloc(af, ppip->ips, M_NOWAIT); 826 if (new == NULL) 827 return (false); /* Redo */ 828 } 829 /* This has no user settings, so just copy the parent's list. */ 830 MPASS(new->ips == ppip->ips); 831 bcopy(ppip->pr_ip, new->pr_ip, ppip->ips * size); 832 prison_ip_set(pr, af, new); 833 if (newp != NULL) 834 *newp = NULL; /* Used */ 835 } else if (pip != NULL) { 836 /* Remove addresses that aren't in the parent. */ 837 int i; 838 839 i = 0; /* index in pip */ 840 ips = 0; /* index in new */ 841 842 if (new == NULL) { 843 new = prison_ip_alloc(af, pip->ips, M_NOWAIT); 844 if (new == NULL) 845 return (false); /* Redo */ 846 } 847 848 for (int pi = 0; pi < ppip->ips; pi++) 849 if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, pi)) == 0) { 850 /* Found our primary address in parent. */ 851 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips), 852 size); 853 i++; 854 ips++; 855 break; 856 } 857 for (int pi = 1; i < pip->ips; ) { 858 /* Check against primary, which is unsorted. */ 859 if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0) { 860 /* Matches parent's primary address. */ 861 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips), 862 size); 863 i++; 864 ips++; 865 continue; 866 } 867 /* The rest are sorted. */ 868 switch (pi >= ppip->ips ? -1 : 869 cmp(PR_IP(pip, af, i), PR_IP(ppip, af, pi))) { 870 case -1: 871 i++; 872 break; 873 case 0: 874 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips), 875 size); 876 i++; 877 pi++; 878 ips++; 879 break; 880 case 1: 881 pi++; 882 break; 883 } 884 } 885 if (ips == 0) { 886 if (newp == NULL || *newp == NULL) 887 prison_ip_free(new); 888 new = NULL; 889 } else { 890 /* Shrink to real size */ 891 KASSERT((new->ips >= ips), 892 ("Out-of-bounds write to prison_ip %p", new)); 893 new->ips = ips; 894 } 895 prison_ip_set(pr, af, new); 896 if (newp != NULL) 897 *newp = NULL; /* Used */ 898 } 899 return (true); 900 } 901 902 /* 903 * Fast-path check if an address belongs to a prison. 904 */ 905 int 906 prison_ip_check(const struct prison *pr, const pr_family_t af, 907 const void *addr) 908 { 909 int (*const cmp)(const void *, const void *) = pr_families[af].cmp; 910 struct prison_ip *pip; 911 int i, a, z, d; 912 913 MPASS(mtx_owned(&pr->pr_mtx) || 914 in_epoch(net_epoch_preempt) || 915 sx_xlocked(&allprison_lock)); 916 917 pip = atomic_load_ptr(&pr->pr_addrs[af]); 918 if (__predict_false(pip == NULL)) 919 return (EAFNOSUPPORT); 920 921 /* Check the primary IP. */ 922 if (cmp(PR_IP(pip, af, 0), addr) == 0) 923 return (0); 924 925 /* 926 * All the other IPs are sorted so we can do a binary search. 927 */ 928 a = 0; 929 z = pip->ips - 2; 930 while (a <= z) { 931 i = (a + z) / 2; 932 d = cmp(PR_IP(pip, af, i + 1), addr); 933 if (d > 0) 934 z = i - 1; 935 else if (d < 0) 936 a = i + 1; 937 else 938 return (0); 939 } 940 941 return (EADDRNOTAVAIL); 942 } 943 944 /* 945 * Grab primary IP. Historically required mutex, but nothing prevents 946 * us to support epoch-protected access. Is it used in fast path? 947 * in{6}_jail.c helper 948 */ 949 const void * 950 prison_ip_get0(const struct prison *pr, const pr_family_t af) 951 { 952 const struct prison_ip *pip = pr->pr_addrs[af]; 953 954 mtx_assert(&pr->pr_mtx, MA_OWNED); 955 MPASS(pip); 956 957 return (pip->pr_ip); 958 } 959 960 u_int 961 prison_ip_cnt(const struct prison *pr, const pr_family_t af) 962 { 963 964 return (pr->pr_addrs[af]->ips); 965 } 966 #endif /* defined(INET) || defined(INET6) */ 967 968 int 969 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 970 { 971 struct nameidata nd; 972 #ifdef INET 973 struct prison_ip *ip4; 974 #endif 975 #ifdef INET6 976 struct prison_ip *ip6; 977 #endif 978 struct vfsopt *opt; 979 struct vfsoptlist *opts; 980 struct prison *pr, *deadpr, *inspr, *mypr, *ppr, *tpr; 981 struct vnode *root; 982 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 983 char *g_path, *osrelstr; 984 struct bool_flags *bf; 985 struct jailsys_flags *jsf; 986 #if defined(INET) || defined(INET6) 987 void *op; 988 #endif 989 unsigned long hid; 990 size_t namelen, onamelen, pnamelen; 991 int born, created, cuflags, descend, drflags, enforce; 992 int error, errmsg_len, errmsg_pos; 993 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 994 int jid, jsys, len, level; 995 int childmax, osreldt, rsnum, slevel; 996 #ifdef INET 997 int ip4s; 998 bool redo_ip4; 999 #endif 1000 #ifdef INET6 1001 int ip6s; 1002 bool redo_ip6; 1003 #endif 1004 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 1005 uint64_t pr_allow_diff; 1006 unsigned tallow; 1007 char numbuf[12]; 1008 1009 error = priv_check(td, PRIV_JAIL_SET); 1010 if (!error && (flags & JAIL_ATTACH)) 1011 error = priv_check(td, PRIV_JAIL_ATTACH); 1012 if (error) 1013 return (error); 1014 mypr = td->td_ucred->cr_prison; 1015 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 1016 return (EPERM); 1017 if (flags & ~JAIL_SET_MASK) 1018 return (EINVAL); 1019 1020 /* 1021 * Check all the parameters before committing to anything. Not all 1022 * errors can be caught early, but we may as well try. Also, this 1023 * takes care of some expensive stuff (path lookup) before getting 1024 * the allprison lock. 1025 * 1026 * XXX Jails are not filesystems, and jail parameters are not mount 1027 * options. But it makes more sense to re-use the vfsopt code 1028 * than duplicate it under a different name. 1029 */ 1030 error = vfs_buildopts(optuio, &opts); 1031 if (error) 1032 return (error); 1033 #ifdef INET 1034 ip4 = NULL; 1035 #endif 1036 #ifdef INET6 1037 ip6 = NULL; 1038 #endif 1039 g_path = NULL; 1040 1041 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 1042 if (!cuflags) { 1043 error = EINVAL; 1044 vfs_opterror(opts, "no valid operation (create or update)"); 1045 goto done_errmsg; 1046 } 1047 1048 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1049 if (error == ENOENT) 1050 jid = 0; 1051 else if (error != 0) 1052 goto done_free; 1053 1054 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 1055 if (error == ENOENT) 1056 gotslevel = 0; 1057 else if (error != 0) 1058 goto done_free; 1059 else 1060 gotslevel = 1; 1061 1062 error = 1063 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 1064 if (error == ENOENT) 1065 gotchildmax = 0; 1066 else if (error != 0) 1067 goto done_free; 1068 else 1069 gotchildmax = 1; 1070 1071 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 1072 if (error == ENOENT) 1073 gotenforce = 0; 1074 else if (error != 0) 1075 goto done_free; 1076 else if (enforce < 0 || enforce > 2) { 1077 error = EINVAL; 1078 goto done_free; 1079 } else 1080 gotenforce = 1; 1081 1082 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 1083 if (error == ENOENT) 1084 gotrsnum = 0; 1085 else if (error != 0) 1086 goto done_free; 1087 else 1088 gotrsnum = 1; 1089 1090 pr_flags = ch_flags = 0; 1091 for (bf = pr_flag_bool; 1092 bf < pr_flag_bool + nitems(pr_flag_bool); 1093 bf++) { 1094 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag); 1095 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag); 1096 } 1097 ch_flags |= pr_flags; 1098 for (jsf = pr_flag_jailsys; 1099 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 1100 jsf++) { 1101 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys)); 1102 if (error == ENOENT) 1103 continue; 1104 if (error != 0) 1105 goto done_free; 1106 switch (jsys) { 1107 case JAIL_SYS_DISABLE: 1108 if (!jsf->disable) { 1109 error = EINVAL; 1110 goto done_free; 1111 } 1112 pr_flags |= jsf->disable; 1113 break; 1114 case JAIL_SYS_NEW: 1115 pr_flags |= jsf->new; 1116 break; 1117 case JAIL_SYS_INHERIT: 1118 break; 1119 default: 1120 error = EINVAL; 1121 goto done_free; 1122 } 1123 ch_flags |= jsf->new | jsf->disable; 1124 } 1125 if ((flags & (JAIL_CREATE | JAIL_ATTACH)) == JAIL_CREATE 1126 && !(pr_flags & PR_PERSIST)) { 1127 error = EINVAL; 1128 vfs_opterror(opts, "new jail must persist or attach"); 1129 goto done_errmsg; 1130 } 1131 #ifdef VIMAGE 1132 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 1133 error = EINVAL; 1134 vfs_opterror(opts, "vnet cannot be changed after creation"); 1135 goto done_errmsg; 1136 } 1137 #endif 1138 #ifdef INET 1139 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 1140 error = EINVAL; 1141 vfs_opterror(opts, "ip4 cannot be changed after creation"); 1142 goto done_errmsg; 1143 } 1144 #endif 1145 #ifdef INET6 1146 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 1147 error = EINVAL; 1148 vfs_opterror(opts, "ip6 cannot be changed after creation"); 1149 goto done_errmsg; 1150 } 1151 #endif 1152 1153 pr_allow = ch_allow = 0; 1154 for (bf = pr_flag_allow; 1155 bf < pr_flag_allow + nitems(pr_flag_allow) && 1156 atomic_load_int(&bf->flag) != 0; 1157 bf++) { 1158 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag); 1159 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag); 1160 } 1161 ch_allow |= pr_allow; 1162 1163 error = vfs_getopt(opts, "name", (void **)&name, &len); 1164 if (error == ENOENT) 1165 name = NULL; 1166 else if (error != 0) 1167 goto done_free; 1168 else { 1169 if (len == 0 || name[len - 1] != '\0') { 1170 error = EINVAL; 1171 goto done_free; 1172 } 1173 if (len > MAXHOSTNAMELEN) { 1174 error = ENAMETOOLONG; 1175 goto done_free; 1176 } 1177 } 1178 1179 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 1180 if (error == ENOENT) 1181 host = NULL; 1182 else if (error != 0) 1183 goto done_free; 1184 else { 1185 ch_flags |= PR_HOST; 1186 pr_flags |= PR_HOST; 1187 if (len == 0 || host[len - 1] != '\0') { 1188 error = EINVAL; 1189 goto done_free; 1190 } 1191 if (len > MAXHOSTNAMELEN) { 1192 error = ENAMETOOLONG; 1193 goto done_free; 1194 } 1195 } 1196 1197 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 1198 if (error == ENOENT) 1199 domain = NULL; 1200 else if (error != 0) 1201 goto done_free; 1202 else { 1203 ch_flags |= PR_HOST; 1204 pr_flags |= PR_HOST; 1205 if (len == 0 || domain[len - 1] != '\0') { 1206 error = EINVAL; 1207 goto done_free; 1208 } 1209 if (len > MAXHOSTNAMELEN) { 1210 error = ENAMETOOLONG; 1211 goto done_free; 1212 } 1213 } 1214 1215 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 1216 if (error == ENOENT) 1217 uuid = NULL; 1218 else if (error != 0) 1219 goto done_free; 1220 else { 1221 ch_flags |= PR_HOST; 1222 pr_flags |= PR_HOST; 1223 if (len == 0 || uuid[len - 1] != '\0') { 1224 error = EINVAL; 1225 goto done_free; 1226 } 1227 if (len > HOSTUUIDLEN) { 1228 error = ENAMETOOLONG; 1229 goto done_free; 1230 } 1231 } 1232 1233 #ifdef COMPAT_FREEBSD32 1234 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 1235 uint32_t hid32; 1236 1237 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 1238 hid = hid32; 1239 } else 1240 #endif 1241 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 1242 if (error == ENOENT) 1243 gothid = 0; 1244 else if (error != 0) 1245 goto done_free; 1246 else { 1247 gothid = 1; 1248 ch_flags |= PR_HOST; 1249 pr_flags |= PR_HOST; 1250 } 1251 1252 #ifdef INET 1253 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 1254 if (error == ENOENT) 1255 ip4s = 0; 1256 else if (error != 0) 1257 goto done_free; 1258 else if (ip4s & (sizeof(struct in_addr) - 1)) { 1259 error = EINVAL; 1260 goto done_free; 1261 } else { 1262 ch_flags |= PR_IP4_USER; 1263 pr_flags |= PR_IP4_USER; 1264 if (ip4s > 0) { 1265 ip4s /= sizeof(struct in_addr); 1266 if (ip4s > jail_max_af_ips) { 1267 error = EINVAL; 1268 vfs_opterror(opts, "too many IPv4 addresses"); 1269 goto done_errmsg; 1270 } 1271 ip4 = prison_ip_copyin(PR_INET, op, ip4s); 1272 if (ip4 == NULL) { 1273 error = EINVAL; 1274 goto done_free; 1275 } 1276 } 1277 } 1278 #endif 1279 1280 #ifdef INET6 1281 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 1282 if (error == ENOENT) 1283 ip6s = 0; 1284 else if (error != 0) 1285 goto done_free; 1286 else if (ip6s & (sizeof(struct in6_addr) - 1)) { 1287 error = EINVAL; 1288 goto done_free; 1289 } else { 1290 ch_flags |= PR_IP6_USER; 1291 pr_flags |= PR_IP6_USER; 1292 if (ip6s > 0) { 1293 ip6s /= sizeof(struct in6_addr); 1294 if (ip6s > jail_max_af_ips) { 1295 error = EINVAL; 1296 vfs_opterror(opts, "too many IPv6 addresses"); 1297 goto done_errmsg; 1298 } 1299 ip6 = prison_ip_copyin(PR_INET6, op, ip6s); 1300 if (ip6 == NULL) { 1301 error = EINVAL; 1302 goto done_free; 1303 } 1304 } 1305 } 1306 #endif 1307 1308 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1309 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1310 error = EINVAL; 1311 vfs_opterror(opts, 1312 "vnet jails cannot have IP address restrictions"); 1313 goto done_errmsg; 1314 } 1315 #endif 1316 1317 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 1318 if (error == ENOENT) 1319 osrelstr = NULL; 1320 else if (error != 0) 1321 goto done_free; 1322 else { 1323 if (flags & JAIL_UPDATE) { 1324 error = EINVAL; 1325 vfs_opterror(opts, 1326 "osrelease cannot be changed after creation"); 1327 goto done_errmsg; 1328 } 1329 if (len == 0 || osrelstr[len - 1] != '\0') { 1330 error = EINVAL; 1331 goto done_free; 1332 } 1333 if (len >= OSRELEASELEN) { 1334 error = ENAMETOOLONG; 1335 vfs_opterror(opts, 1336 "osrelease string must be 1-%d bytes long", 1337 OSRELEASELEN - 1); 1338 goto done_errmsg; 1339 } 1340 } 1341 1342 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 1343 if (error == ENOENT) 1344 osreldt = 0; 1345 else if (error != 0) 1346 goto done_free; 1347 else { 1348 if (flags & JAIL_UPDATE) { 1349 error = EINVAL; 1350 vfs_opterror(opts, 1351 "osreldate cannot be changed after creation"); 1352 goto done_errmsg; 1353 } 1354 if (osreldt == 0) { 1355 error = EINVAL; 1356 vfs_opterror(opts, "osreldate cannot be 0"); 1357 goto done_errmsg; 1358 } 1359 } 1360 1361 root = NULL; 1362 error = vfs_getopt(opts, "path", (void **)&path, &len); 1363 if (error == ENOENT) 1364 path = NULL; 1365 else if (error != 0) 1366 goto done_free; 1367 else { 1368 if (flags & JAIL_UPDATE) { 1369 error = EINVAL; 1370 vfs_opterror(opts, 1371 "path cannot be changed after creation"); 1372 goto done_errmsg; 1373 } 1374 if (len == 0 || path[len - 1] != '\0') { 1375 error = EINVAL; 1376 goto done_free; 1377 } 1378 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path); 1379 error = namei(&nd); 1380 if (error) 1381 goto done_free; 1382 root = nd.ni_vp; 1383 NDFREE_PNBUF(&nd); 1384 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1385 strlcpy(g_path, path, MAXPATHLEN); 1386 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 1387 if (error == 0) { 1388 path = g_path; 1389 } else { 1390 /* exit on other errors */ 1391 goto done_free; 1392 } 1393 if (root->v_type != VDIR) { 1394 error = ENOTDIR; 1395 vput(root); 1396 goto done_free; 1397 } 1398 VOP_UNLOCK(root); 1399 } 1400 1401 /* 1402 * Find the specified jail, or at least its parent. 1403 * This abuses the file error codes ENOENT and EEXIST. 1404 */ 1405 pr = NULL; 1406 inspr = NULL; 1407 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 1408 namelc = strrchr(name, '.'); 1409 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 1410 if (*p != '\0') 1411 jid = 0; 1412 } 1413 sx_xlock(&allprison_lock); 1414 drflags = PD_LIST_XLOCKED; 1415 ppr = mypr; 1416 if (!prison_isalive(ppr)) { 1417 /* This jail is dying. This process will surely follow. */ 1418 error = EAGAIN; 1419 goto done_deref; 1420 } 1421 if (jid != 0) { 1422 if (jid < 0) { 1423 error = EINVAL; 1424 vfs_opterror(opts, "negative jid"); 1425 goto done_deref; 1426 } 1427 /* 1428 * See if a requested jid already exists. Keep track of 1429 * where it can be inserted later. 1430 */ 1431 TAILQ_FOREACH(inspr, &allprison, pr_list) { 1432 if (inspr->pr_id < jid) 1433 continue; 1434 if (inspr->pr_id > jid) 1435 break; 1436 pr = inspr; 1437 mtx_lock(&pr->pr_mtx); 1438 drflags |= PD_LOCKED; 1439 inspr = NULL; 1440 break; 1441 } 1442 if (pr != NULL) { 1443 /* Create: jid must not exist. */ 1444 if (cuflags == JAIL_CREATE) { 1445 /* 1446 * Even creators that cannot see the jail will 1447 * get EEXIST. 1448 */ 1449 error = EEXIST; 1450 vfs_opterror(opts, "jail %d already exists", 1451 jid); 1452 goto done_deref; 1453 } 1454 if (!prison_ischild(mypr, pr)) { 1455 /* 1456 * Updaters get ENOENT if they cannot see the 1457 * jail. This is true even for CREATE | UPDATE, 1458 * which normally cannot give this error. 1459 */ 1460 error = ENOENT; 1461 vfs_opterror(opts, "jail %d not found", jid); 1462 goto done_deref; 1463 } 1464 ppr = pr->pr_parent; 1465 if (!prison_isalive(ppr)) { 1466 error = ENOENT; 1467 vfs_opterror(opts, "jail %d is dying", 1468 ppr->pr_id); 1469 goto done_deref; 1470 } 1471 if (!prison_isalive(pr)) { 1472 if (!(flags & JAIL_DYING)) { 1473 error = ENOENT; 1474 vfs_opterror(opts, "jail %d is dying", 1475 jid); 1476 goto done_deref; 1477 } 1478 if ((flags & JAIL_ATTACH) || 1479 (pr_flags & PR_PERSIST)) { 1480 /* 1481 * A dying jail might be resurrected 1482 * (via attach or persist), but first 1483 * it must determine if another jail 1484 * has claimed its name. Accomplish 1485 * this by implicitly re-setting the 1486 * name. 1487 */ 1488 if (name == NULL) 1489 name = prison_name(mypr, pr); 1490 } 1491 } 1492 } else { 1493 /* Update: jid must exist. */ 1494 if (cuflags == JAIL_UPDATE) { 1495 error = ENOENT; 1496 vfs_opterror(opts, "jail %d not found", jid); 1497 goto done_deref; 1498 } 1499 } 1500 } 1501 /* 1502 * If the caller provided a name, look for a jail by that name. 1503 * This has different semantics for creates and updates keyed by jid 1504 * (where the name must not already exist in a different jail), 1505 * and updates keyed by the name itself (where the name must exist 1506 * because that is the jail being updated). 1507 */ 1508 namelc = NULL; 1509 if (name != NULL) { 1510 namelc = strrchr(name, '.'); 1511 if (namelc == NULL) 1512 namelc = name; 1513 else { 1514 /* 1515 * This is a hierarchical name. Split it into the 1516 * parent and child names, and make sure the parent 1517 * exists or matches an already found jail. 1518 */ 1519 if (pr != NULL) { 1520 if (strncmp(name, ppr->pr_name, namelc - name) 1521 || ppr->pr_name[namelc - name] != '\0') { 1522 error = EINVAL; 1523 vfs_opterror(opts, 1524 "cannot change jail's parent"); 1525 goto done_deref; 1526 } 1527 } else { 1528 *namelc = '\0'; 1529 ppr = prison_find_name(mypr, name); 1530 if (ppr == NULL) { 1531 error = ENOENT; 1532 vfs_opterror(opts, 1533 "jail \"%s\" not found", name); 1534 goto done_deref; 1535 } 1536 mtx_unlock(&ppr->pr_mtx); 1537 if (!prison_isalive(ppr)) { 1538 error = ENOENT; 1539 vfs_opterror(opts, 1540 "jail \"%s\" is dying", name); 1541 goto done_deref; 1542 } 1543 *namelc = '.'; 1544 } 1545 namelc++; 1546 } 1547 if (namelc[0] != '\0') { 1548 pnamelen = 1549 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1550 deadpr = NULL; 1551 FOREACH_PRISON_CHILD(ppr, tpr) { 1552 if (tpr != pr && 1553 !strcmp(tpr->pr_name + pnamelen, namelc)) { 1554 if (prison_isalive(tpr)) { 1555 if (pr == NULL && 1556 cuflags != JAIL_CREATE) { 1557 /* 1558 * Use this jail 1559 * for updates. 1560 */ 1561 pr = tpr; 1562 mtx_lock(&pr->pr_mtx); 1563 drflags |= PD_LOCKED; 1564 break; 1565 } 1566 /* 1567 * Create, or update(jid): 1568 * name must not exist in an 1569 * active sibling jail. 1570 */ 1571 error = EEXIST; 1572 vfs_opterror(opts, 1573 "jail \"%s\" already exists", 1574 name); 1575 goto done_deref; 1576 } 1577 if (pr == NULL && 1578 cuflags != JAIL_CREATE) { 1579 deadpr = tpr; 1580 } 1581 } 1582 } 1583 /* If no active jail is found, use a dying one. */ 1584 if (deadpr != NULL && pr == NULL) { 1585 if (flags & JAIL_DYING) { 1586 pr = deadpr; 1587 mtx_lock(&pr->pr_mtx); 1588 drflags |= PD_LOCKED; 1589 } else if (cuflags == JAIL_UPDATE) { 1590 error = ENOENT; 1591 vfs_opterror(opts, 1592 "jail \"%s\" is dying", name); 1593 goto done_deref; 1594 } 1595 } 1596 /* Update: name must exist if no jid. */ 1597 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1598 error = ENOENT; 1599 vfs_opterror(opts, "jail \"%s\" not found", 1600 name); 1601 goto done_deref; 1602 } 1603 } 1604 } 1605 /* Update: must provide a jid or name. */ 1606 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1607 error = ENOENT; 1608 vfs_opterror(opts, "update specified no jail"); 1609 goto done_deref; 1610 } 1611 1612 /* If there's no prison to update, create a new one and link it in. */ 1613 created = pr == NULL; 1614 if (created) { 1615 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1616 if (tpr->pr_childcount >= tpr->pr_childmax) { 1617 error = EPERM; 1618 vfs_opterror(opts, "prison limit exceeded"); 1619 goto done_deref; 1620 } 1621 if (jid == 0 && (jid = get_next_prid(&inspr)) == 0) { 1622 error = EAGAIN; 1623 vfs_opterror(opts, "no available jail IDs"); 1624 goto done_deref; 1625 } 1626 1627 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1628 pr->pr_state = PRISON_STATE_INVALID; 1629 refcount_init(&pr->pr_ref, 1); 1630 refcount_init(&pr->pr_uref, 0); 1631 drflags |= PD_DEREF; 1632 LIST_INIT(&pr->pr_children); 1633 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1634 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1635 1636 pr->pr_id = jid; 1637 if (inspr != NULL) 1638 TAILQ_INSERT_BEFORE(inspr, pr, pr_list); 1639 else 1640 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1641 1642 pr->pr_parent = ppr; 1643 prison_hold(ppr); 1644 prison_proc_hold(ppr); 1645 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1646 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1647 tpr->pr_childcount++; 1648 1649 /* Set some default values, and inherit some from the parent. */ 1650 if (namelc == NULL) 1651 namelc = ""; 1652 if (path == NULL) { 1653 path = "/"; 1654 root = mypr->pr_root; 1655 vref(root); 1656 } 1657 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1658 pr->pr_flags |= PR_HOST; 1659 #if defined(INET) || defined(INET6) 1660 #ifdef VIMAGE 1661 if (!(pr_flags & PR_VNET)) 1662 #endif 1663 { 1664 #ifdef INET 1665 if (!(ch_flags & PR_IP4_USER)) 1666 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1667 else if (!(pr_flags & PR_IP4_USER)) { 1668 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1669 prison_ip_dup(ppr, pr, PR_INET); 1670 } 1671 #endif 1672 #ifdef INET6 1673 if (!(ch_flags & PR_IP6_USER)) 1674 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1675 else if (!(pr_flags & PR_IP6_USER)) { 1676 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1677 prison_ip_dup(ppr, pr, PR_INET6); 1678 } 1679 #endif 1680 } 1681 #endif 1682 /* Source address selection is always on by default. */ 1683 pr->pr_flags |= _PR_IP_SADDRSEL; 1684 1685 pr->pr_securelevel = ppr->pr_securelevel; 1686 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1687 pr->pr_enforce_statfs = jail_default_enforce_statfs; 1688 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1689 1690 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1691 if (osrelstr == NULL) 1692 strlcpy(pr->pr_osrelease, ppr->pr_osrelease, 1693 sizeof(pr->pr_osrelease)); 1694 else 1695 strlcpy(pr->pr_osrelease, osrelstr, 1696 sizeof(pr->pr_osrelease)); 1697 1698 #ifdef VIMAGE 1699 /* Allocate a new vnet if specified. */ 1700 pr->pr_vnet = (pr_flags & PR_VNET) 1701 ? vnet_alloc() : ppr->pr_vnet; 1702 #endif 1703 /* 1704 * Allocate a dedicated cpuset for each jail. 1705 * Unlike other initial settings, this may return an error. 1706 */ 1707 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1708 if (error) 1709 goto done_deref; 1710 1711 mtx_lock(&pr->pr_mtx); 1712 drflags |= PD_LOCKED; 1713 } else { 1714 /* 1715 * Grab a reference for existing prisons, to ensure they 1716 * continue to exist for the duration of the call. 1717 */ 1718 prison_hold(pr); 1719 drflags |= PD_DEREF; 1720 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1721 if ((pr->pr_flags & PR_VNET) && 1722 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1723 error = EINVAL; 1724 vfs_opterror(opts, 1725 "vnet jails cannot have IP address restrictions"); 1726 goto done_deref; 1727 } 1728 #endif 1729 #ifdef INET 1730 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1731 error = EINVAL; 1732 vfs_opterror(opts, 1733 "ip4 cannot be changed after creation"); 1734 goto done_deref; 1735 } 1736 #endif 1737 #ifdef INET6 1738 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1739 error = EINVAL; 1740 vfs_opterror(opts, 1741 "ip6 cannot be changed after creation"); 1742 goto done_deref; 1743 } 1744 #endif 1745 } 1746 1747 /* Do final error checking before setting anything. */ 1748 if (gotslevel) { 1749 if (slevel < ppr->pr_securelevel) { 1750 error = EPERM; 1751 goto done_deref; 1752 } 1753 } 1754 if (gotchildmax) { 1755 if (childmax >= ppr->pr_childmax) { 1756 error = EPERM; 1757 goto done_deref; 1758 } 1759 } 1760 if (gotenforce) { 1761 if (enforce < ppr->pr_enforce_statfs) { 1762 error = EPERM; 1763 goto done_deref; 1764 } 1765 } 1766 if (gotrsnum) { 1767 /* 1768 * devfs_rsnum is a uint16_t 1769 */ 1770 if (rsnum < 0 || rsnum > 65535) { 1771 error = EINVAL; 1772 goto done_deref; 1773 } 1774 /* 1775 * Nested jails always inherit parent's devfs ruleset 1776 */ 1777 if (jailed(td->td_ucred)) { 1778 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1779 error = EPERM; 1780 goto done_deref; 1781 } else 1782 rsnum = ppr->pr_devfs_rsnum; 1783 } 1784 } 1785 #ifdef INET 1786 if (ip4s > 0) { 1787 if ((ppr->pr_flags & PR_IP4) && 1788 !prison_ip_parent_match(ppr->pr_addrs[PR_INET], ip4, 1789 PR_INET)) { 1790 error = EPERM; 1791 goto done_deref; 1792 } 1793 if (!prison_ip_conflict_check(ppr, pr, ip4, PR_INET)) { 1794 error = EADDRINUSE; 1795 vfs_opterror(opts, "IPv4 addresses clash"); 1796 goto done_deref; 1797 } 1798 } 1799 #endif 1800 #ifdef INET6 1801 if (ip6s > 0) { 1802 if ((ppr->pr_flags & PR_IP6) && 1803 !prison_ip_parent_match(ppr->pr_addrs[PR_INET6], ip6, 1804 PR_INET6)) { 1805 error = EPERM; 1806 goto done_deref; 1807 } 1808 if (!prison_ip_conflict_check(ppr, pr, ip6, PR_INET6)) { 1809 error = EADDRINUSE; 1810 vfs_opterror(opts, "IPv6 addresses clash"); 1811 goto done_deref; 1812 } 1813 } 1814 #endif 1815 onamelen = namelen = 0; 1816 if (namelc != NULL) { 1817 /* Give a default name of the jid. Also allow the name to be 1818 * explicitly the jid - but not any other number, and only in 1819 * normal form (no leading zero/etc). 1820 */ 1821 if (namelc[0] == '\0') 1822 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 1823 else if ((strtoul(namelc, &p, 10) != jid || 1824 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1825 error = EINVAL; 1826 vfs_opterror(opts, 1827 "name cannot be numeric (unless it is the jid)"); 1828 goto done_deref; 1829 } 1830 /* 1831 * Make sure the name isn't too long for the prison or its 1832 * children. 1833 */ 1834 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1835 onamelen = strlen(pr->pr_name + pnamelen); 1836 namelen = strlen(namelc); 1837 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1838 error = ENAMETOOLONG; 1839 goto done_deref; 1840 } 1841 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1842 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1843 sizeof(pr->pr_name)) { 1844 error = ENAMETOOLONG; 1845 goto done_deref; 1846 } 1847 } 1848 } 1849 pr_allow_diff = pr_allow & ~ppr->pr_allow; 1850 if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) { 1851 error = EPERM; 1852 goto done_deref; 1853 } 1854 1855 /* 1856 * Let modules check their parameters. This requires unlocking and 1857 * then re-locking the prison, but this is still a valid state as long 1858 * as allprison_lock remains xlocked. 1859 */ 1860 mtx_unlock(&pr->pr_mtx); 1861 drflags &= ~PD_LOCKED; 1862 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1863 if (error != 0) 1864 goto done_deref; 1865 mtx_lock(&pr->pr_mtx); 1866 drflags |= PD_LOCKED; 1867 1868 /* At this point, all valid parameters should have been noted. */ 1869 TAILQ_FOREACH(opt, opts, link) { 1870 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1871 error = EINVAL; 1872 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1873 goto done_deref; 1874 } 1875 } 1876 1877 /* Set the parameters of the prison. */ 1878 #ifdef INET 1879 redo_ip4 = false; 1880 if (pr_flags & PR_IP4_USER) { 1881 pr->pr_flags |= PR_IP4; 1882 prison_ip_set(pr, PR_INET, ip4); 1883 ip4 = NULL; 1884 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1885 #ifdef VIMAGE 1886 if (tpr->pr_flags & PR_VNET) { 1887 descend = 0; 1888 continue; 1889 } 1890 #endif 1891 if (!prison_ip_restrict(tpr, PR_INET, NULL)) { 1892 redo_ip4 = true; 1893 descend = 0; 1894 } 1895 } 1896 } 1897 #endif 1898 #ifdef INET6 1899 redo_ip6 = false; 1900 if (pr_flags & PR_IP6_USER) { 1901 pr->pr_flags |= PR_IP6; 1902 prison_ip_set(pr, PR_INET6, ip6); 1903 ip6 = NULL; 1904 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1905 #ifdef VIMAGE 1906 if (tpr->pr_flags & PR_VNET) { 1907 descend = 0; 1908 continue; 1909 } 1910 #endif 1911 if (!prison_ip_restrict(tpr, PR_INET6, NULL)) { 1912 redo_ip6 = true; 1913 descend = 0; 1914 } 1915 } 1916 } 1917 #endif 1918 if (gotslevel) { 1919 pr->pr_securelevel = slevel; 1920 /* Set all child jails to be at least this level. */ 1921 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1922 if (tpr->pr_securelevel < slevel) 1923 tpr->pr_securelevel = slevel; 1924 } 1925 if (gotchildmax) { 1926 pr->pr_childmax = childmax; 1927 /* Set all child jails to under this limit. */ 1928 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1929 if (tpr->pr_childmax > childmax - level) 1930 tpr->pr_childmax = childmax > level 1931 ? childmax - level : 0; 1932 } 1933 if (gotenforce) { 1934 pr->pr_enforce_statfs = enforce; 1935 /* Pass this restriction on to the children. */ 1936 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1937 if (tpr->pr_enforce_statfs < enforce) 1938 tpr->pr_enforce_statfs = enforce; 1939 } 1940 if (gotrsnum) { 1941 pr->pr_devfs_rsnum = rsnum; 1942 /* Pass this restriction on to the children. */ 1943 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1944 tpr->pr_devfs_rsnum = rsnum; 1945 } 1946 if (namelc != NULL) { 1947 if (ppr == &prison0) 1948 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1949 else 1950 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1951 ppr->pr_name, namelc); 1952 /* Change this component of child names. */ 1953 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1954 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1955 strlen(tpr->pr_name + onamelen) + 1); 1956 bcopy(pr->pr_name, tpr->pr_name, namelen); 1957 } 1958 } 1959 if (path != NULL) { 1960 /* Try to keep a real-rooted full pathname. */ 1961 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1962 pr->pr_root = root; 1963 root = NULL; 1964 } 1965 if (PR_HOST & ch_flags & ~pr_flags) { 1966 if (pr->pr_flags & PR_HOST) { 1967 /* 1968 * Copy the parent's host info. As with pr_ip4 above, 1969 * the lack of a lock on the parent is not a problem; 1970 * it is always set with allprison_lock at least 1971 * shared, and is held exclusively here. 1972 */ 1973 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1974 sizeof(pr->pr_hostname)); 1975 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1976 sizeof(pr->pr_domainname)); 1977 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1978 sizeof(pr->pr_hostuuid)); 1979 pr->pr_hostid = pr->pr_parent->pr_hostid; 1980 } 1981 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1982 /* Set this prison, and any descendants without PR_HOST. */ 1983 if (host != NULL) 1984 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1985 if (domain != NULL) 1986 strlcpy(pr->pr_domainname, domain, 1987 sizeof(pr->pr_domainname)); 1988 if (uuid != NULL) 1989 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1990 if (gothid) 1991 pr->pr_hostid = hid; 1992 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1993 if (tpr->pr_flags & PR_HOST) 1994 descend = 0; 1995 else { 1996 if (host != NULL) 1997 strlcpy(tpr->pr_hostname, 1998 pr->pr_hostname, 1999 sizeof(tpr->pr_hostname)); 2000 if (domain != NULL) 2001 strlcpy(tpr->pr_domainname, 2002 pr->pr_domainname, 2003 sizeof(tpr->pr_domainname)); 2004 if (uuid != NULL) 2005 strlcpy(tpr->pr_hostuuid, 2006 pr->pr_hostuuid, 2007 sizeof(tpr->pr_hostuuid)); 2008 if (gothid) 2009 tpr->pr_hostid = hid; 2010 } 2011 } 2012 } 2013 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 2014 if ((tallow = ch_allow & ~pr_allow)) 2015 prison_set_allow_locked(pr, tallow, 0); 2016 /* 2017 * Persistent prisons get an extra reference, and prisons losing their 2018 * persist flag lose that reference. 2019 */ 2020 born = !prison_isalive(pr); 2021 if (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags)) { 2022 if (pr_flags & PR_PERSIST) { 2023 prison_hold(pr); 2024 /* 2025 * This may make a dead prison alive again, but wait 2026 * to label it as such until after OSD calls have had 2027 * a chance to run (and perhaps to fail). 2028 */ 2029 refcount_acquire(&pr->pr_uref); 2030 } else { 2031 drflags |= PD_DEUREF; 2032 prison_free_not_last(pr); 2033 } 2034 } 2035 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 2036 mtx_unlock(&pr->pr_mtx); 2037 drflags &= ~PD_LOCKED; 2038 /* 2039 * Any errors past this point will need to de-persist newly created 2040 * prisons, as well as call remove methods. 2041 */ 2042 if (born) 2043 drflags |= PD_KILL; 2044 2045 #ifdef RACCT 2046 if (racct_enable && created) 2047 prison_racct_attach(pr); 2048 #endif 2049 2050 /* Locks may have prevented a complete restriction of child IP 2051 * addresses. If so, allocate some more memory and try again. 2052 */ 2053 #ifdef INET 2054 while (redo_ip4) { 2055 ip4s = pr->pr_addrs[PR_INET]->ips; 2056 MPASS(ip4 == NULL); 2057 ip4 = prison_ip_alloc(PR_INET, ip4s, M_WAITOK); 2058 mtx_lock(&pr->pr_mtx); 2059 redo_ip4 = false; 2060 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 2061 #ifdef VIMAGE 2062 if (tpr->pr_flags & PR_VNET) { 2063 descend = 0; 2064 continue; 2065 } 2066 #endif 2067 if (!prison_ip_restrict(tpr, PR_INET, &ip4)) 2068 redo_ip4 = true; 2069 } 2070 mtx_unlock(&pr->pr_mtx); 2071 } 2072 #endif 2073 #ifdef INET6 2074 while (redo_ip6) { 2075 ip6s = pr->pr_addrs[PR_INET6]->ips; 2076 MPASS(ip6 == NULL); 2077 ip6 = prison_ip_alloc(PR_INET6, ip6s, M_WAITOK); 2078 mtx_lock(&pr->pr_mtx); 2079 redo_ip6 = false; 2080 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 2081 #ifdef VIMAGE 2082 if (tpr->pr_flags & PR_VNET) { 2083 descend = 0; 2084 continue; 2085 } 2086 #endif 2087 if (!prison_ip_restrict(tpr, PR_INET6, &ip6)) 2088 redo_ip6 = true; 2089 } 2090 mtx_unlock(&pr->pr_mtx); 2091 } 2092 #endif 2093 2094 /* Let the modules do their work. */ 2095 if (born) { 2096 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 2097 if (error) 2098 goto done_deref; 2099 } 2100 error = osd_jail_call(pr, PR_METHOD_SET, opts); 2101 if (error) 2102 goto done_deref; 2103 2104 /* 2105 * A new prison is now ready to be seen; either it has gained a user 2106 * reference via persistence, or is about to gain one via attachment. 2107 */ 2108 if (born) { 2109 drflags = prison_lock_xlock(pr, drflags); 2110 pr->pr_state = PRISON_STATE_ALIVE; 2111 } 2112 2113 /* Attach this process to the prison if requested. */ 2114 if (flags & JAIL_ATTACH) { 2115 error = do_jail_attach(td, pr, 2116 prison_lock_xlock(pr, drflags & PD_LOCK_FLAGS)); 2117 drflags &= ~(PD_LOCKED | PD_LIST_XLOCKED); 2118 if (error) { 2119 vfs_opterror(opts, "attach failed"); 2120 goto done_deref; 2121 } 2122 } 2123 2124 #ifdef RACCT 2125 if (racct_enable && !created) { 2126 if (drflags & PD_LOCKED) { 2127 mtx_unlock(&pr->pr_mtx); 2128 drflags &= ~PD_LOCKED; 2129 } 2130 if (drflags & PD_LIST_XLOCKED) { 2131 sx_xunlock(&allprison_lock); 2132 drflags &= ~PD_LIST_XLOCKED; 2133 } 2134 prison_racct_modify(pr); 2135 } 2136 #endif 2137 2138 if (born && pr != &prison0 && (pr->pr_allow & PR_ALLOW_NFSD) != 0 && 2139 (pr->pr_root->v_vflag & VV_ROOT) == 0) 2140 printf("Warning jail jid=%d: mountd/nfsd requires a separate" 2141 " file system\n", pr->pr_id); 2142 2143 drflags &= ~PD_KILL; 2144 td->td_retval[0] = pr->pr_id; 2145 2146 done_deref: 2147 /* Release any temporary prison holds and/or locks. */ 2148 if (pr != NULL) 2149 prison_deref(pr, drflags); 2150 else if (drflags & PD_LIST_SLOCKED) 2151 sx_sunlock(&allprison_lock); 2152 else if (drflags & PD_LIST_XLOCKED) 2153 sx_xunlock(&allprison_lock); 2154 if (root != NULL) 2155 vrele(root); 2156 done_errmsg: 2157 if (error) { 2158 /* Write the error message back to userspace. */ 2159 if (vfs_getopt(opts, "errmsg", (void **)&errmsg, 2160 &errmsg_len) == 0 && errmsg_len > 0) { 2161 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 2162 if (optuio->uio_segflg == UIO_SYSSPACE) 2163 bcopy(errmsg, 2164 optuio->uio_iov[errmsg_pos].iov_base, 2165 errmsg_len); 2166 else 2167 copyout(errmsg, 2168 optuio->uio_iov[errmsg_pos].iov_base, 2169 errmsg_len); 2170 } 2171 } 2172 done_free: 2173 #ifdef INET 2174 prison_ip_free(ip4); 2175 #endif 2176 #ifdef INET6 2177 prison_ip_free(ip6); 2178 #endif 2179 if (g_path != NULL) 2180 free(g_path, M_TEMP); 2181 vfs_freeopts(opts); 2182 return (error); 2183 } 2184 2185 /* 2186 * Find the next available prison ID. Return the ID on success, or zero 2187 * on failure. Also set a pointer to the allprison list entry the prison 2188 * should be inserted before. 2189 */ 2190 static int 2191 get_next_prid(struct prison **insprp) 2192 { 2193 struct prison *inspr; 2194 int jid, maxid; 2195 2196 jid = lastprid % JAIL_MAX + 1; 2197 if (TAILQ_EMPTY(&allprison) || 2198 TAILQ_LAST(&allprison, prisonlist)->pr_id < jid) { 2199 /* 2200 * A common case is for all jails to be implicitly numbered, 2201 * which means they'll go on the end of the list, at least 2202 * for the first JAIL_MAX times. 2203 */ 2204 inspr = NULL; 2205 } else { 2206 /* 2207 * Take two passes through the allprison list: first starting 2208 * with the proposed jid, then ending with it. 2209 */ 2210 for (maxid = JAIL_MAX; maxid != 0; ) { 2211 TAILQ_FOREACH(inspr, &allprison, pr_list) { 2212 if (inspr->pr_id < jid) 2213 continue; 2214 if (inspr->pr_id > jid) { 2215 /* Found an opening. */ 2216 maxid = 0; 2217 break; 2218 } 2219 if (++jid > maxid) { 2220 if (lastprid == maxid || lastprid == 0) 2221 { 2222 /* 2223 * The entire legal range 2224 * has been traversed 2225 */ 2226 return 0; 2227 } 2228 /* Try again from the start. */ 2229 jid = 1; 2230 maxid = lastprid; 2231 break; 2232 } 2233 } 2234 if (inspr == NULL) { 2235 /* Found room at the end of the list. */ 2236 break; 2237 } 2238 } 2239 } 2240 *insprp = inspr; 2241 lastprid = jid; 2242 return (jid); 2243 } 2244 2245 /* 2246 * struct jail_get_args { 2247 * struct iovec *iovp; 2248 * unsigned int iovcnt; 2249 * int flags; 2250 * }; 2251 */ 2252 int 2253 sys_jail_get(struct thread *td, struct jail_get_args *uap) 2254 { 2255 struct uio *auio; 2256 int error; 2257 2258 /* Check that we have an even number of iovecs. */ 2259 if (uap->iovcnt & 1) 2260 return (EINVAL); 2261 2262 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 2263 if (error) 2264 return (error); 2265 error = kern_jail_get(td, auio, uap->flags); 2266 if (error == 0) 2267 error = copyout(auio->uio_iov, uap->iovp, 2268 uap->iovcnt * sizeof (struct iovec)); 2269 free(auio, M_IOV); 2270 return (error); 2271 } 2272 2273 int 2274 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 2275 { 2276 struct bool_flags *bf; 2277 struct jailsys_flags *jsf; 2278 struct prison *pr, *mypr; 2279 struct vfsopt *opt; 2280 struct vfsoptlist *opts; 2281 char *errmsg, *name; 2282 int drflags, error, errmsg_len, errmsg_pos, i, jid, len, pos; 2283 unsigned f; 2284 2285 if (flags & ~JAIL_GET_MASK) 2286 return (EINVAL); 2287 2288 /* Get the parameter list. */ 2289 error = vfs_buildopts(optuio, &opts); 2290 if (error) 2291 return (error); 2292 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 2293 mypr = td->td_ucred->cr_prison; 2294 pr = NULL; 2295 2296 /* 2297 * Find the prison specified by one of: lastjid, jid, name. 2298 */ 2299 sx_slock(&allprison_lock); 2300 drflags = PD_LIST_SLOCKED; 2301 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 2302 if (error == 0) { 2303 TAILQ_FOREACH(pr, &allprison, pr_list) { 2304 if (pr->pr_id > jid && 2305 ((flags & JAIL_DYING) || prison_isalive(pr)) && 2306 prison_ischild(mypr, pr)) { 2307 mtx_lock(&pr->pr_mtx); 2308 drflags |= PD_LOCKED; 2309 goto found_prison; 2310 } 2311 } 2312 error = ENOENT; 2313 vfs_opterror(opts, "no jail after %d", jid); 2314 goto done; 2315 } else if (error != ENOENT) 2316 goto done; 2317 2318 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 2319 if (error == 0) { 2320 if (jid != 0) { 2321 pr = prison_find_child(mypr, jid); 2322 if (pr != NULL) { 2323 drflags |= PD_LOCKED; 2324 if (!(prison_isalive(pr) || 2325 (flags & JAIL_DYING))) { 2326 error = ENOENT; 2327 vfs_opterror(opts, "jail %d is dying", 2328 jid); 2329 goto done; 2330 } 2331 goto found_prison; 2332 } 2333 error = ENOENT; 2334 vfs_opterror(opts, "jail %d not found", jid); 2335 goto done; 2336 } 2337 } else if (error != ENOENT) 2338 goto done; 2339 2340 error = vfs_getopt(opts, "name", (void **)&name, &len); 2341 if (error == 0) { 2342 if (len == 0 || name[len - 1] != '\0') { 2343 error = EINVAL; 2344 goto done; 2345 } 2346 pr = prison_find_name(mypr, name); 2347 if (pr != NULL) { 2348 drflags |= PD_LOCKED; 2349 if (!(prison_isalive(pr) || (flags & JAIL_DYING))) { 2350 error = ENOENT; 2351 vfs_opterror(opts, "jail \"%s\" is dying", 2352 name); 2353 goto done; 2354 } 2355 goto found_prison; 2356 } 2357 error = ENOENT; 2358 vfs_opterror(opts, "jail \"%s\" not found", name); 2359 goto done; 2360 } else if (error != ENOENT) 2361 goto done; 2362 2363 vfs_opterror(opts, "no jail specified"); 2364 error = ENOENT; 2365 goto done; 2366 2367 found_prison: 2368 /* Get the parameters of the prison. */ 2369 prison_hold(pr); 2370 drflags |= PD_DEREF; 2371 td->td_retval[0] = pr->pr_id; 2372 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2373 if (error != 0 && error != ENOENT) 2374 goto done; 2375 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2376 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2377 if (error != 0 && error != ENOENT) 2378 goto done; 2379 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2380 if (error != 0 && error != ENOENT) 2381 goto done; 2382 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2383 sizeof(pr->pr_cpuset->cs_id)); 2384 if (error != 0 && error != ENOENT) 2385 goto done; 2386 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2387 if (error != 0 && error != ENOENT) 2388 goto done; 2389 #ifdef INET 2390 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_addrs[PR_INET]->pr_ip, 2391 pr->pr_addrs[PR_INET] ? pr->pr_addrs[PR_INET]->ips * 2392 pr_families[PR_INET].size : 0 ); 2393 if (error != 0 && error != ENOENT) 2394 goto done; 2395 #endif 2396 #ifdef INET6 2397 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_addrs[PR_INET6]->pr_ip, 2398 pr->pr_addrs[PR_INET6] ? pr->pr_addrs[PR_INET6]->ips * 2399 pr_families[PR_INET6].size : 0 ); 2400 if (error != 0 && error != ENOENT) 2401 goto done; 2402 #endif 2403 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2404 sizeof(pr->pr_securelevel)); 2405 if (error != 0 && error != ENOENT) 2406 goto done; 2407 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2408 sizeof(pr->pr_childcount)); 2409 if (error != 0 && error != ENOENT) 2410 goto done; 2411 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2412 sizeof(pr->pr_childmax)); 2413 if (error != 0 && error != ENOENT) 2414 goto done; 2415 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2416 if (error != 0 && error != ENOENT) 2417 goto done; 2418 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2419 if (error != 0 && error != ENOENT) 2420 goto done; 2421 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2422 if (error != 0 && error != ENOENT) 2423 goto done; 2424 #ifdef COMPAT_FREEBSD32 2425 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2426 uint32_t hid32 = pr->pr_hostid; 2427 2428 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2429 } else 2430 #endif 2431 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2432 sizeof(pr->pr_hostid)); 2433 if (error != 0 && error != ENOENT) 2434 goto done; 2435 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2436 sizeof(pr->pr_enforce_statfs)); 2437 if (error != 0 && error != ENOENT) 2438 goto done; 2439 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2440 sizeof(pr->pr_devfs_rsnum)); 2441 if (error != 0 && error != ENOENT) 2442 goto done; 2443 for (bf = pr_flag_bool; 2444 bf < pr_flag_bool + nitems(pr_flag_bool); 2445 bf++) { 2446 i = (pr->pr_flags & bf->flag) ? 1 : 0; 2447 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2448 if (error != 0 && error != ENOENT) 2449 goto done; 2450 i = !i; 2451 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2452 if (error != 0 && error != ENOENT) 2453 goto done; 2454 } 2455 for (jsf = pr_flag_jailsys; 2456 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 2457 jsf++) { 2458 f = pr->pr_flags & (jsf->disable | jsf->new); 2459 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE 2460 : (f == jsf->new) ? JAIL_SYS_NEW 2461 : JAIL_SYS_INHERIT; 2462 error = vfs_setopt(opts, jsf->name, &i, sizeof(i)); 2463 if (error != 0 && error != ENOENT) 2464 goto done; 2465 } 2466 for (bf = pr_flag_allow; 2467 bf < pr_flag_allow + nitems(pr_flag_allow) && 2468 atomic_load_int(&bf->flag) != 0; 2469 bf++) { 2470 i = (pr->pr_allow & bf->flag) ? 1 : 0; 2471 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2472 if (error != 0 && error != ENOENT) 2473 goto done; 2474 i = !i; 2475 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2476 if (error != 0 && error != ENOENT) 2477 goto done; 2478 } 2479 i = !prison_isalive(pr); 2480 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2481 if (error != 0 && error != ENOENT) 2482 goto done; 2483 i = !i; 2484 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2485 if (error != 0 && error != ENOENT) 2486 goto done; 2487 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2488 sizeof(pr->pr_osreldate)); 2489 if (error != 0 && error != ENOENT) 2490 goto done; 2491 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2492 if (error != 0 && error != ENOENT) 2493 goto done; 2494 2495 /* Get the module parameters. */ 2496 mtx_unlock(&pr->pr_mtx); 2497 drflags &= ~PD_LOCKED; 2498 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2499 if (error) 2500 goto done; 2501 prison_deref(pr, drflags); 2502 pr = NULL; 2503 drflags = 0; 2504 2505 /* By now, all parameters should have been noted. */ 2506 TAILQ_FOREACH(opt, opts, link) { 2507 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2508 error = EINVAL; 2509 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2510 goto done; 2511 } 2512 } 2513 2514 /* Write the fetched parameters back to userspace. */ 2515 error = 0; 2516 TAILQ_FOREACH(opt, opts, link) { 2517 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2518 pos = 2 * opt->pos + 1; 2519 optuio->uio_iov[pos].iov_len = opt->len; 2520 if (opt->value != NULL) { 2521 if (optuio->uio_segflg == UIO_SYSSPACE) { 2522 bcopy(opt->value, 2523 optuio->uio_iov[pos].iov_base, 2524 opt->len); 2525 } else { 2526 error = copyout(opt->value, 2527 optuio->uio_iov[pos].iov_base, 2528 opt->len); 2529 if (error) 2530 break; 2531 } 2532 } 2533 } 2534 } 2535 2536 done: 2537 /* Release any temporary prison holds and/or locks. */ 2538 if (pr != NULL) 2539 prison_deref(pr, drflags); 2540 else if (drflags & PD_LIST_SLOCKED) 2541 sx_sunlock(&allprison_lock); 2542 if (error && errmsg_pos >= 0) { 2543 /* Write the error message back to userspace. */ 2544 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2545 errmsg_pos = 2 * errmsg_pos + 1; 2546 if (errmsg_len > 0) { 2547 if (optuio->uio_segflg == UIO_SYSSPACE) 2548 bcopy(errmsg, 2549 optuio->uio_iov[errmsg_pos].iov_base, 2550 errmsg_len); 2551 else 2552 copyout(errmsg, 2553 optuio->uio_iov[errmsg_pos].iov_base, 2554 errmsg_len); 2555 } 2556 } 2557 vfs_freeopts(opts); 2558 return (error); 2559 } 2560 2561 /* 2562 * struct jail_remove_args { 2563 * int jid; 2564 * }; 2565 */ 2566 int 2567 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2568 { 2569 struct prison *pr; 2570 int error; 2571 2572 error = priv_check(td, PRIV_JAIL_REMOVE); 2573 if (error) 2574 return (error); 2575 2576 sx_xlock(&allprison_lock); 2577 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2578 if (pr == NULL) { 2579 sx_xunlock(&allprison_lock); 2580 return (EINVAL); 2581 } 2582 if (!prison_isalive(pr)) { 2583 /* Silently ignore already-dying prisons. */ 2584 mtx_unlock(&pr->pr_mtx); 2585 sx_xunlock(&allprison_lock); 2586 return (0); 2587 } 2588 prison_deref(pr, PD_KILL | PD_LOCKED | PD_LIST_XLOCKED); 2589 return (0); 2590 } 2591 2592 /* 2593 * struct jail_attach_args { 2594 * int jid; 2595 * }; 2596 */ 2597 int 2598 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2599 { 2600 struct prison *pr; 2601 int error; 2602 2603 error = priv_check(td, PRIV_JAIL_ATTACH); 2604 if (error) 2605 return (error); 2606 2607 sx_slock(&allprison_lock); 2608 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2609 if (pr == NULL) { 2610 sx_sunlock(&allprison_lock); 2611 return (EINVAL); 2612 } 2613 2614 /* Do not allow a process to attach to a prison that is not alive. */ 2615 if (!prison_isalive(pr)) { 2616 mtx_unlock(&pr->pr_mtx); 2617 sx_sunlock(&allprison_lock); 2618 return (EINVAL); 2619 } 2620 2621 return (do_jail_attach(td, pr, PD_LOCKED | PD_LIST_SLOCKED)); 2622 } 2623 2624 static int 2625 do_jail_attach(struct thread *td, struct prison *pr, int drflags) 2626 { 2627 struct proc *p; 2628 struct ucred *newcred, *oldcred; 2629 int error; 2630 2631 mtx_assert(&pr->pr_mtx, MA_OWNED); 2632 sx_assert(&allprison_lock, SX_LOCKED); 2633 drflags &= PD_LOCK_FLAGS; 2634 /* 2635 * XXX: Note that there is a slight race here if two threads 2636 * in the same privileged process attempt to attach to two 2637 * different jails at the same time. It is important for 2638 * user processes not to do this, or they might end up with 2639 * a process root from one prison, but attached to the jail 2640 * of another. 2641 */ 2642 prison_hold(pr); 2643 refcount_acquire(&pr->pr_uref); 2644 drflags |= PD_DEREF | PD_DEUREF; 2645 mtx_unlock(&pr->pr_mtx); 2646 drflags &= ~PD_LOCKED; 2647 2648 /* Let modules do whatever they need to prepare for attaching. */ 2649 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2650 if (error) { 2651 prison_deref(pr, drflags); 2652 return (error); 2653 } 2654 sx_unlock(&allprison_lock); 2655 drflags &= ~(PD_LIST_SLOCKED | PD_LIST_XLOCKED); 2656 2657 /* 2658 * Reparent the newly attached process to this jail. 2659 */ 2660 p = td->td_proc; 2661 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2662 if (error) 2663 goto e_revert_osd; 2664 2665 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2666 if ((error = change_dir(pr->pr_root, td)) != 0) 2667 goto e_unlock; 2668 #ifdef MAC 2669 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2670 goto e_unlock; 2671 #endif 2672 VOP_UNLOCK(pr->pr_root); 2673 if ((error = pwd_chroot_chdir(td, pr->pr_root))) 2674 goto e_revert_osd; 2675 2676 newcred = crget(); 2677 PROC_LOCK(p); 2678 oldcred = crcopysafe(p, newcred); 2679 newcred->cr_prison = pr; 2680 proc_set_cred(p, newcred); 2681 setsugid(p); 2682 #ifdef RACCT 2683 racct_proc_ucred_changed(p, oldcred, newcred); 2684 crhold(newcred); 2685 #endif 2686 PROC_UNLOCK(p); 2687 #ifdef RCTL 2688 rctl_proc_ucred_changed(p, newcred); 2689 crfree(newcred); 2690 #endif 2691 prison_proc_relink(oldcred->cr_prison, pr, p); 2692 prison_deref(oldcred->cr_prison, drflags); 2693 crfree(oldcred); 2694 2695 /* 2696 * If the prison was killed while changing credentials, die along 2697 * with it. 2698 */ 2699 if (!prison_isalive(pr)) { 2700 PROC_LOCK(p); 2701 kern_psignal(p, SIGKILL); 2702 PROC_UNLOCK(p); 2703 } 2704 2705 return (0); 2706 2707 e_unlock: 2708 VOP_UNLOCK(pr->pr_root); 2709 e_revert_osd: 2710 /* Tell modules this thread is still in its old jail after all. */ 2711 sx_slock(&allprison_lock); 2712 drflags |= PD_LIST_SLOCKED; 2713 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2714 prison_deref(pr, drflags); 2715 return (error); 2716 } 2717 2718 /* 2719 * Returns a locked prison instance, or NULL on failure. 2720 */ 2721 struct prison * 2722 prison_find(int prid) 2723 { 2724 struct prison *pr; 2725 2726 sx_assert(&allprison_lock, SX_LOCKED); 2727 TAILQ_FOREACH(pr, &allprison, pr_list) { 2728 if (pr->pr_id < prid) 2729 continue; 2730 if (pr->pr_id > prid) 2731 break; 2732 KASSERT(prison_isvalid(pr), ("Found invalid prison %p", pr)); 2733 mtx_lock(&pr->pr_mtx); 2734 return (pr); 2735 } 2736 return (NULL); 2737 } 2738 2739 /* 2740 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2741 */ 2742 struct prison * 2743 prison_find_child(struct prison *mypr, int prid) 2744 { 2745 struct prison *pr; 2746 int descend; 2747 2748 sx_assert(&allprison_lock, SX_LOCKED); 2749 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2750 if (pr->pr_id == prid) { 2751 KASSERT(prison_isvalid(pr), 2752 ("Found invalid prison %p", pr)); 2753 mtx_lock(&pr->pr_mtx); 2754 return (pr); 2755 } 2756 } 2757 return (NULL); 2758 } 2759 2760 /* 2761 * Look for the name relative to mypr. Returns a locked prison or NULL. 2762 */ 2763 struct prison * 2764 prison_find_name(struct prison *mypr, const char *name) 2765 { 2766 struct prison *pr, *deadpr; 2767 size_t mylen; 2768 int descend; 2769 2770 sx_assert(&allprison_lock, SX_LOCKED); 2771 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2772 deadpr = NULL; 2773 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2774 if (!strcmp(pr->pr_name + mylen, name)) { 2775 KASSERT(prison_isvalid(pr), 2776 ("Found invalid prison %p", pr)); 2777 if (prison_isalive(pr)) { 2778 mtx_lock(&pr->pr_mtx); 2779 return (pr); 2780 } 2781 deadpr = pr; 2782 } 2783 } 2784 /* There was no valid prison - perhaps there was a dying one. */ 2785 if (deadpr != NULL) 2786 mtx_lock(&deadpr->pr_mtx); 2787 return (deadpr); 2788 } 2789 2790 /* 2791 * See if a prison has the specific flag set. The prison should be locked, 2792 * unless checking for flags that are only set at jail creation (such as 2793 * PR_IP4 and PR_IP6), or only the single bit is examined, without regard 2794 * to any other prison data. 2795 */ 2796 bool 2797 prison_flag(struct ucred *cred, unsigned flag) 2798 { 2799 2800 return ((cred->cr_prison->pr_flags & flag) != 0); 2801 } 2802 2803 /* 2804 * See if a prison has the specific allow flag set. 2805 * The prison *should* be locked, or only a single bit is examined, without 2806 * regard to any other prison data. 2807 */ 2808 bool 2809 prison_allow(struct ucred *cred, unsigned flag) 2810 { 2811 2812 return ((cred->cr_prison->pr_allow & flag) != 0); 2813 } 2814 2815 /* 2816 * Hold a prison reference, by incrementing pr_ref. It is generally 2817 * an error to hold a prison that does not already have a reference. 2818 * A prison record will remain valid as long as it has at least one 2819 * reference, and will not be removed as long as either the prison 2820 * mutex or the allprison lock is held (allprison_lock may be shared). 2821 */ 2822 void 2823 prison_hold_locked(struct prison *pr) 2824 { 2825 2826 /* Locking is no longer required. */ 2827 prison_hold(pr); 2828 } 2829 2830 void 2831 prison_hold(struct prison *pr) 2832 { 2833 #ifdef INVARIANTS 2834 int was_valid = refcount_acquire_if_not_zero(&pr->pr_ref); 2835 2836 KASSERT(was_valid, 2837 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id)); 2838 #else 2839 refcount_acquire(&pr->pr_ref); 2840 #endif 2841 } 2842 2843 /* 2844 * Remove a prison reference. If that was the last reference, the 2845 * prison will be removed (at a later time). 2846 */ 2847 void 2848 prison_free_locked(struct prison *pr) 2849 { 2850 2851 mtx_assert(&pr->pr_mtx, MA_OWNED); 2852 /* 2853 * Locking is no longer required, but unlock because the caller 2854 * expects it. 2855 */ 2856 mtx_unlock(&pr->pr_mtx); 2857 prison_free(pr); 2858 } 2859 2860 void 2861 prison_free(struct prison *pr) 2862 { 2863 2864 KASSERT(refcount_load(&pr->pr_ref) > 0, 2865 ("Trying to free dead prison %p (jid=%d).", 2866 pr, pr->pr_id)); 2867 if (!refcount_release_if_not_last(&pr->pr_ref)) { 2868 /* 2869 * Don't remove the last reference in this context, 2870 * in case there are locks held. 2871 */ 2872 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2873 } 2874 } 2875 2876 static void 2877 prison_free_not_last(struct prison *pr) 2878 { 2879 #ifdef INVARIANTS 2880 int lastref; 2881 2882 KASSERT(refcount_load(&pr->pr_ref) > 0, 2883 ("Trying to free dead prison %p (jid=%d).", 2884 pr, pr->pr_id)); 2885 lastref = refcount_release(&pr->pr_ref); 2886 KASSERT(!lastref, 2887 ("prison_free_not_last freed last ref on prison %p (jid=%d).", 2888 pr, pr->pr_id)); 2889 #else 2890 refcount_release(&pr->pr_ref); 2891 #endif 2892 } 2893 2894 /* 2895 * Hold a prison for user visibility, by incrementing pr_uref. 2896 * It is generally an error to hold a prison that isn't already 2897 * user-visible, except through the jail system calls. It is also 2898 * an error to hold an invalid prison. A prison record will remain 2899 * alive as long as it has at least one user reference, and will not 2900 * be set to the dying state until the prison mutex and allprison_lock 2901 * are both freed. 2902 */ 2903 void 2904 prison_proc_hold(struct prison *pr) 2905 { 2906 #ifdef INVARIANTS 2907 int was_alive = refcount_acquire_if_not_zero(&pr->pr_uref); 2908 2909 KASSERT(was_alive, 2910 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2911 #else 2912 refcount_acquire(&pr->pr_uref); 2913 #endif 2914 } 2915 2916 /* 2917 * Remove a prison user reference. If it was the last reference, the 2918 * prison will be considered "dying", and may be removed once all of 2919 * its references are dropped. 2920 */ 2921 void 2922 prison_proc_free(struct prison *pr) 2923 { 2924 2925 /* 2926 * Locking is only required when releasing the last reference. 2927 * This allows assurance that a locked prison will remain alive 2928 * until it is unlocked. 2929 */ 2930 KASSERT(refcount_load(&pr->pr_uref) > 0, 2931 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2932 if (!refcount_release_if_not_last(&pr->pr_uref)) { 2933 /* 2934 * Don't remove the last user reference in this context, 2935 * which is expected to be a process that is not only locked, 2936 * but also half dead. Add a reference so any calls to 2937 * prison_free() won't re-submit the task. 2938 */ 2939 prison_hold(pr); 2940 mtx_lock(&pr->pr_mtx); 2941 KASSERT(!(pr->pr_flags & PR_COMPLETE_PROC), 2942 ("Redundant last reference in prison_proc_free (jid=%d)", 2943 pr->pr_id)); 2944 pr->pr_flags |= PR_COMPLETE_PROC; 2945 mtx_unlock(&pr->pr_mtx); 2946 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2947 } 2948 } 2949 2950 static void 2951 prison_proc_free_not_last(struct prison *pr) 2952 { 2953 #ifdef INVARIANTS 2954 int lastref; 2955 2956 KASSERT(refcount_load(&pr->pr_uref) > 0, 2957 ("Trying to free dead prison %p (jid=%d).", 2958 pr, pr->pr_id)); 2959 lastref = refcount_release(&pr->pr_uref); 2960 KASSERT(!lastref, 2961 ("prison_proc_free_not_last freed last uref on prison %p (jid=%d).", 2962 pr, pr->pr_id)); 2963 #else 2964 refcount_release(&pr->pr_uref); 2965 #endif 2966 } 2967 2968 void 2969 prison_proc_link(struct prison *pr, struct proc *p) 2970 { 2971 2972 sx_assert(&allproc_lock, SA_XLOCKED); 2973 LIST_INSERT_HEAD(&pr->pr_proclist, p, p_jaillist); 2974 } 2975 2976 void 2977 prison_proc_unlink(struct prison *pr, struct proc *p) 2978 { 2979 2980 sx_assert(&allproc_lock, SA_XLOCKED); 2981 LIST_REMOVE(p, p_jaillist); 2982 } 2983 2984 static void 2985 prison_proc_relink(struct prison *opr, struct prison *npr, struct proc *p) 2986 { 2987 2988 sx_xlock(&allproc_lock); 2989 prison_proc_unlink(opr, p); 2990 prison_proc_link(npr, p); 2991 sx_xunlock(&allproc_lock); 2992 } 2993 2994 /* 2995 * Complete a call to either prison_free or prison_proc_free. 2996 */ 2997 static void 2998 prison_complete(void *context, int pending) 2999 { 3000 struct prison *pr = context; 3001 int drflags; 3002 3003 /* 3004 * This could be called to release the last reference, or the last 3005 * user reference (plus the reference held in prison_proc_free). 3006 */ 3007 drflags = prison_lock_xlock(pr, PD_DEREF); 3008 if (pr->pr_flags & PR_COMPLETE_PROC) { 3009 pr->pr_flags &= ~PR_COMPLETE_PROC; 3010 drflags |= PD_DEUREF; 3011 } 3012 prison_deref(pr, drflags); 3013 } 3014 3015 static void 3016 prison_kill_processes_cb(struct proc *p, void *arg __unused) 3017 { 3018 3019 kern_psignal(p, SIGKILL); 3020 } 3021 3022 /* 3023 * Note the iteration does not guarantee acting on all processes. 3024 * Most notably there may be fork or jail_attach in progress. 3025 */ 3026 void 3027 prison_proc_iterate(struct prison *pr, void (*cb)(struct proc *, void *), 3028 void *cbarg) 3029 { 3030 struct prison *ppr; 3031 struct proc *p; 3032 3033 if (atomic_load_int(&pr->pr_childcount) == 0) { 3034 sx_slock(&allproc_lock); 3035 LIST_FOREACH(p, &pr->pr_proclist, p_jaillist) { 3036 if (p->p_state == PRS_NEW) 3037 continue; 3038 PROC_LOCK(p); 3039 cb(p, cbarg); 3040 PROC_UNLOCK(p); 3041 } 3042 sx_sunlock(&allproc_lock); 3043 if (atomic_load_int(&pr->pr_childcount) == 0) 3044 return; 3045 /* 3046 * Some jails popped up during the iteration, fall through to a 3047 * system-wide search. 3048 */ 3049 } 3050 3051 sx_slock(&allproc_lock); 3052 FOREACH_PROC_IN_SYSTEM(p) { 3053 PROC_LOCK(p); 3054 if (p->p_state != PRS_NEW && p->p_ucred != NULL) { 3055 for (ppr = p->p_ucred->cr_prison; 3056 ppr != &prison0; 3057 ppr = ppr->pr_parent) { 3058 if (ppr == pr) { 3059 cb(p, cbarg); 3060 break; 3061 } 3062 } 3063 } 3064 PROC_UNLOCK(p); 3065 } 3066 sx_sunlock(&allproc_lock); 3067 } 3068 3069 /* 3070 * Remove a prison reference and/or user reference (usually). 3071 * This assumes context that allows sleeping (for allprison_lock), 3072 * with no non-sleeping locks held, except perhaps the prison itself. 3073 * If there are no more references, release and delist the prison. 3074 * On completion, the prison lock and the allprison lock are both 3075 * unlocked. 3076 */ 3077 static void 3078 prison_deref(struct prison *pr, int flags) 3079 { 3080 struct prisonlist freeprison; 3081 struct prison *killpr, *rpr, *ppr, *tpr; 3082 3083 killpr = NULL; 3084 TAILQ_INIT(&freeprison); 3085 /* 3086 * Release this prison as requested, which may cause its parent 3087 * to be released, and then maybe its grandparent, etc. 3088 */ 3089 for (;;) { 3090 if (flags & PD_KILL) { 3091 /* Kill the prison and its descendents. */ 3092 KASSERT(pr != &prison0, 3093 ("prison_deref trying to kill prison0")); 3094 if (!(flags & PD_DEREF)) { 3095 prison_hold(pr); 3096 flags |= PD_DEREF; 3097 } 3098 flags = prison_lock_xlock(pr, flags); 3099 prison_deref_kill(pr, &freeprison); 3100 } 3101 if (flags & PD_DEUREF) { 3102 /* Drop a user reference. */ 3103 KASSERT(refcount_load(&pr->pr_uref) > 0, 3104 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 3105 pr->pr_id)); 3106 if (!refcount_release_if_not_last(&pr->pr_uref)) { 3107 if (!(flags & PD_DEREF)) { 3108 prison_hold(pr); 3109 flags |= PD_DEREF; 3110 } 3111 flags = prison_lock_xlock(pr, flags); 3112 if (refcount_release(&pr->pr_uref) && 3113 pr->pr_state == PRISON_STATE_ALIVE) { 3114 /* 3115 * When the last user references goes, 3116 * this becomes a dying prison. 3117 */ 3118 KASSERT( 3119 refcount_load(&prison0.pr_uref) > 0, 3120 ("prison0 pr_uref=0")); 3121 pr->pr_state = PRISON_STATE_DYING; 3122 mtx_unlock(&pr->pr_mtx); 3123 flags &= ~PD_LOCKED; 3124 prison_cleanup(pr); 3125 } 3126 } 3127 } 3128 if (flags & PD_KILL) { 3129 /* 3130 * Any remaining user references are probably processes 3131 * that need to be killed, either in this prison or its 3132 * descendants. 3133 */ 3134 if (refcount_load(&pr->pr_uref) > 0) 3135 killpr = pr; 3136 /* Make sure the parent prison doesn't get killed. */ 3137 flags &= ~PD_KILL; 3138 } 3139 if (flags & PD_DEREF) { 3140 /* Drop a reference. */ 3141 KASSERT(refcount_load(&pr->pr_ref) > 0, 3142 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 3143 pr->pr_id)); 3144 if (!refcount_release_if_not_last(&pr->pr_ref)) { 3145 flags = prison_lock_xlock(pr, flags); 3146 if (refcount_release(&pr->pr_ref)) { 3147 /* 3148 * When the last reference goes, 3149 * unlink the prison and set it aside. 3150 */ 3151 KASSERT( 3152 refcount_load(&pr->pr_uref) == 0, 3153 ("prison_deref: last ref, " 3154 "but still has %d urefs (jid=%d)", 3155 pr->pr_uref, pr->pr_id)); 3156 KASSERT( 3157 refcount_load(&prison0.pr_ref) != 0, 3158 ("prison0 pr_ref=0")); 3159 pr->pr_state = PRISON_STATE_INVALID; 3160 TAILQ_REMOVE(&allprison, pr, pr_list); 3161 LIST_REMOVE(pr, pr_sibling); 3162 TAILQ_INSERT_TAIL(&freeprison, pr, 3163 pr_list); 3164 for (ppr = pr->pr_parent; 3165 ppr != NULL; 3166 ppr = ppr->pr_parent) 3167 ppr->pr_childcount--; 3168 /* 3169 * Removing a prison frees references 3170 * from its parent. 3171 */ 3172 mtx_unlock(&pr->pr_mtx); 3173 flags &= ~PD_LOCKED; 3174 pr = pr->pr_parent; 3175 flags |= PD_DEREF | PD_DEUREF; 3176 continue; 3177 } 3178 } 3179 } 3180 break; 3181 } 3182 3183 /* Release all the prison locks. */ 3184 if (flags & PD_LOCKED) 3185 mtx_unlock(&pr->pr_mtx); 3186 if (flags & PD_LIST_SLOCKED) 3187 sx_sunlock(&allprison_lock); 3188 else if (flags & PD_LIST_XLOCKED) 3189 sx_xunlock(&allprison_lock); 3190 3191 /* Kill any processes attached to a killed prison. */ 3192 if (killpr != NULL) 3193 prison_proc_iterate(killpr, prison_kill_processes_cb, NULL); 3194 3195 /* 3196 * Finish removing any unreferenced prisons, which couldn't happen 3197 * while allprison_lock was held (to avoid a LOR on vrele). 3198 */ 3199 TAILQ_FOREACH_SAFE(rpr, &freeprison, pr_list, tpr) { 3200 #ifdef VIMAGE 3201 if (rpr->pr_vnet != rpr->pr_parent->pr_vnet) 3202 vnet_destroy(rpr->pr_vnet); 3203 #endif 3204 if (rpr->pr_root != NULL) 3205 vrele(rpr->pr_root); 3206 mtx_destroy(&rpr->pr_mtx); 3207 #ifdef INET 3208 prison_ip_free(rpr->pr_addrs[PR_INET]); 3209 #endif 3210 #ifdef INET6 3211 prison_ip_free(rpr->pr_addrs[PR_INET6]); 3212 #endif 3213 if (rpr->pr_cpuset != NULL) 3214 cpuset_rel(rpr->pr_cpuset); 3215 osd_jail_exit(rpr); 3216 #ifdef RACCT 3217 if (racct_enable) 3218 prison_racct_detach(rpr); 3219 #endif 3220 TAILQ_REMOVE(&freeprison, rpr, pr_list); 3221 free(rpr, M_PRISON); 3222 } 3223 } 3224 3225 /* 3226 * Kill the prison and its descendants. Mark them as dying, clear the 3227 * persist flag, and call module remove methods. 3228 */ 3229 static void 3230 prison_deref_kill(struct prison *pr, struct prisonlist *freeprison) 3231 { 3232 struct prison *cpr, *ppr, *rpr; 3233 bool descend; 3234 3235 /* 3236 * Unlike the descendants, the target prison can be killed 3237 * even if it is currently dying. This is useful for failed 3238 * creation in jail_set(2). 3239 */ 3240 KASSERT(refcount_load(&pr->pr_ref) > 0, 3241 ("Trying to kill dead prison %p (jid=%d).", 3242 pr, pr->pr_id)); 3243 refcount_acquire(&pr->pr_uref); 3244 pr->pr_state = PRISON_STATE_DYING; 3245 mtx_unlock(&pr->pr_mtx); 3246 3247 rpr = NULL; 3248 FOREACH_PRISON_DESCENDANT_PRE_POST(pr, cpr, descend) { 3249 if (descend) { 3250 if (!prison_isalive(cpr)) { 3251 descend = false; 3252 continue; 3253 } 3254 prison_hold(cpr); 3255 prison_proc_hold(cpr); 3256 mtx_lock(&cpr->pr_mtx); 3257 cpr->pr_state = PRISON_STATE_DYING; 3258 cpr->pr_flags |= PR_REMOVE; 3259 mtx_unlock(&cpr->pr_mtx); 3260 continue; 3261 } 3262 if (!(cpr->pr_flags & PR_REMOVE)) 3263 continue; 3264 prison_cleanup(cpr); 3265 mtx_lock(&cpr->pr_mtx); 3266 cpr->pr_flags &= ~PR_REMOVE; 3267 if (cpr->pr_flags & PR_PERSIST) { 3268 cpr->pr_flags &= ~PR_PERSIST; 3269 prison_proc_free_not_last(cpr); 3270 prison_free_not_last(cpr); 3271 } 3272 (void)refcount_release(&cpr->pr_uref); 3273 if (refcount_release(&cpr->pr_ref)) { 3274 /* 3275 * When the last reference goes, unlink the prison 3276 * and set it aside for prison_deref() to handle. 3277 * Delay unlinking the sibling list to keep the loop 3278 * safe. 3279 */ 3280 if (rpr != NULL) 3281 LIST_REMOVE(rpr, pr_sibling); 3282 rpr = cpr; 3283 rpr->pr_state = PRISON_STATE_INVALID; 3284 TAILQ_REMOVE(&allprison, rpr, pr_list); 3285 TAILQ_INSERT_TAIL(freeprison, rpr, pr_list); 3286 /* 3287 * Removing a prison frees references from its parent. 3288 */ 3289 ppr = rpr->pr_parent; 3290 prison_proc_free_not_last(ppr); 3291 prison_free_not_last(ppr); 3292 for (; ppr != NULL; ppr = ppr->pr_parent) 3293 ppr->pr_childcount--; 3294 } 3295 mtx_unlock(&cpr->pr_mtx); 3296 } 3297 if (rpr != NULL) 3298 LIST_REMOVE(rpr, pr_sibling); 3299 3300 prison_cleanup(pr); 3301 mtx_lock(&pr->pr_mtx); 3302 if (pr->pr_flags & PR_PERSIST) { 3303 pr->pr_flags &= ~PR_PERSIST; 3304 prison_proc_free_not_last(pr); 3305 prison_free_not_last(pr); 3306 } 3307 (void)refcount_release(&pr->pr_uref); 3308 } 3309 3310 /* 3311 * Given the current locking state in the flags, make sure allprison_lock 3312 * is held exclusive, and the prison is locked. Return flags indicating 3313 * the new state. 3314 */ 3315 static int 3316 prison_lock_xlock(struct prison *pr, int flags) 3317 { 3318 3319 if (!(flags & PD_LIST_XLOCKED)) { 3320 /* 3321 * Get allprison_lock, which may be an upgrade, 3322 * and may require unlocking the prison. 3323 */ 3324 if (flags & PD_LOCKED) { 3325 mtx_unlock(&pr->pr_mtx); 3326 flags &= ~PD_LOCKED; 3327 } 3328 if (flags & PD_LIST_SLOCKED) { 3329 if (!sx_try_upgrade(&allprison_lock)) { 3330 sx_sunlock(&allprison_lock); 3331 sx_xlock(&allprison_lock); 3332 } 3333 flags &= ~PD_LIST_SLOCKED; 3334 } else 3335 sx_xlock(&allprison_lock); 3336 flags |= PD_LIST_XLOCKED; 3337 } 3338 if (!(flags & PD_LOCKED)) { 3339 /* Lock the prison mutex. */ 3340 mtx_lock(&pr->pr_mtx); 3341 flags |= PD_LOCKED; 3342 } 3343 return flags; 3344 } 3345 3346 /* 3347 * Release a prison's resources when it starts dying (when the last user 3348 * reference is dropped, or when it is killed). 3349 */ 3350 static void 3351 prison_cleanup(struct prison *pr) 3352 { 3353 sx_assert(&allprison_lock, SA_XLOCKED); 3354 mtx_assert(&pr->pr_mtx, MA_NOTOWNED); 3355 vfs_exjail_delete(pr); 3356 shm_remove_prison(pr); 3357 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 3358 } 3359 3360 /* 3361 * Set or clear a permission bit in the pr_allow field, passing restrictions 3362 * (cleared permission) down to child jails. 3363 */ 3364 void 3365 prison_set_allow(struct ucred *cred, unsigned flag, int enable) 3366 { 3367 struct prison *pr; 3368 3369 pr = cred->cr_prison; 3370 sx_slock(&allprison_lock); 3371 mtx_lock(&pr->pr_mtx); 3372 prison_set_allow_locked(pr, flag, enable); 3373 mtx_unlock(&pr->pr_mtx); 3374 sx_sunlock(&allprison_lock); 3375 } 3376 3377 static void 3378 prison_set_allow_locked(struct prison *pr, unsigned flag, int enable) 3379 { 3380 struct prison *cpr; 3381 int descend; 3382 3383 if (enable != 0) 3384 pr->pr_allow |= flag; 3385 else { 3386 pr->pr_allow &= ~flag; 3387 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 3388 cpr->pr_allow &= ~flag; 3389 } 3390 } 3391 3392 /* 3393 * Check if a jail supports the given address family. 3394 * 3395 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3396 * if not. 3397 */ 3398 int 3399 prison_check_af(struct ucred *cred, int af) 3400 { 3401 struct prison *pr; 3402 int error; 3403 3404 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3405 3406 pr = cred->cr_prison; 3407 #ifdef VIMAGE 3408 /* Prisons with their own network stack are not limited. */ 3409 if (prison_owns_vnet(cred)) 3410 return (0); 3411 #endif 3412 3413 error = 0; 3414 switch (af) 3415 { 3416 #ifdef INET 3417 case AF_INET: 3418 if (pr->pr_flags & PR_IP4) 3419 { 3420 mtx_lock(&pr->pr_mtx); 3421 if ((pr->pr_flags & PR_IP4) && 3422 pr->pr_addrs[PR_INET] == NULL) 3423 error = EAFNOSUPPORT; 3424 mtx_unlock(&pr->pr_mtx); 3425 } 3426 break; 3427 #endif 3428 #ifdef INET6 3429 case AF_INET6: 3430 if (pr->pr_flags & PR_IP6) 3431 { 3432 mtx_lock(&pr->pr_mtx); 3433 if ((pr->pr_flags & PR_IP6) && 3434 pr->pr_addrs[PR_INET6] == NULL) 3435 error = EAFNOSUPPORT; 3436 mtx_unlock(&pr->pr_mtx); 3437 } 3438 break; 3439 #endif 3440 case AF_LOCAL: 3441 case AF_ROUTE: 3442 case AF_NETLINK: 3443 break; 3444 default: 3445 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3446 error = EAFNOSUPPORT; 3447 } 3448 return (error); 3449 } 3450 3451 /* 3452 * Check if given address belongs to the jail referenced by cred (wrapper to 3453 * prison_check_ip[46]). 3454 * 3455 * Returns 0 if jail doesn't restrict the address family or if address belongs 3456 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3457 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3458 */ 3459 int 3460 prison_if(struct ucred *cred, const struct sockaddr *sa) 3461 { 3462 #ifdef INET 3463 const struct sockaddr_in *sai; 3464 #endif 3465 #ifdef INET6 3466 const struct sockaddr_in6 *sai6; 3467 #endif 3468 int error; 3469 3470 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3471 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3472 3473 #ifdef VIMAGE 3474 if (prison_owns_vnet(cred)) 3475 return (0); 3476 #endif 3477 3478 error = 0; 3479 switch (sa->sa_family) 3480 { 3481 #ifdef INET 3482 case AF_INET: 3483 sai = (const struct sockaddr_in *)sa; 3484 error = prison_check_ip4(cred, &sai->sin_addr); 3485 break; 3486 #endif 3487 #ifdef INET6 3488 case AF_INET6: 3489 sai6 = (const struct sockaddr_in6 *)sa; 3490 error = prison_check_ip6(cred, &sai6->sin6_addr); 3491 break; 3492 #endif 3493 default: 3494 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3495 error = EAFNOSUPPORT; 3496 } 3497 return (error); 3498 } 3499 3500 /* 3501 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3502 */ 3503 int 3504 prison_check(struct ucred *cred1, struct ucred *cred2) 3505 { 3506 3507 return ((cred1->cr_prison == cred2->cr_prison || 3508 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3509 } 3510 3511 /* 3512 * For mountd/nfsd to run within a prison, it must be: 3513 * - A vnet prison. 3514 * - PR_ALLOW_NFSD must be set on it. 3515 * - The root directory (pr_root) of the prison must be 3516 * a file system mount point, so the mountd can hang 3517 * export information on it. 3518 * - The prison's enforce_statfs cannot be 0, so that 3519 * mountd(8) can do exports. 3520 */ 3521 bool 3522 prison_check_nfsd(struct ucred *cred) 3523 { 3524 3525 if (jailed_without_vnet(cred)) 3526 return (false); 3527 if (!prison_allow(cred, PR_ALLOW_NFSD)) 3528 return (false); 3529 if ((cred->cr_prison->pr_root->v_vflag & VV_ROOT) == 0) 3530 return (false); 3531 if (cred->cr_prison->pr_enforce_statfs == 0) 3532 return (false); 3533 return (true); 3534 } 3535 3536 /* 3537 * Return true if p2 is a child of p1, otherwise false. 3538 */ 3539 bool 3540 prison_ischild(struct prison *pr1, struct prison *pr2) 3541 { 3542 3543 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3544 if (pr1 == pr2) 3545 return (true); 3546 return (false); 3547 } 3548 3549 /* 3550 * Return true if the prison is currently alive. A prison is alive if it 3551 * holds user references and it isn't being removed. 3552 */ 3553 bool 3554 prison_isalive(const struct prison *pr) 3555 { 3556 3557 if (__predict_false(pr->pr_state != PRISON_STATE_ALIVE)) 3558 return (false); 3559 return (true); 3560 } 3561 3562 /* 3563 * Return true if the prison is currently valid. A prison is valid if it has 3564 * been fully created, and is not being destroyed. Note that dying prisons 3565 * are still considered valid. Invalid prisons won't be found under normal 3566 * circumstances, as they're only put in that state by functions that have 3567 * an exclusive hold on allprison_lock. 3568 */ 3569 bool 3570 prison_isvalid(struct prison *pr) 3571 { 3572 3573 if (__predict_false(pr->pr_state == PRISON_STATE_INVALID)) 3574 return (false); 3575 if (__predict_false(refcount_load(&pr->pr_ref) == 0)) 3576 return (false); 3577 return (true); 3578 } 3579 3580 /* 3581 * Return true if the passed credential is in a jail and that jail does not 3582 * have its own virtual network stack, otherwise false. 3583 */ 3584 bool 3585 jailed_without_vnet(struct ucred *cred) 3586 { 3587 3588 if (!jailed(cred)) 3589 return (false); 3590 #ifdef VIMAGE 3591 if (prison_owns_vnet(cred)) 3592 return (false); 3593 #endif 3594 3595 return (true); 3596 } 3597 3598 /* 3599 * Return the correct hostname (domainname, et al) for the passed credential. 3600 */ 3601 void 3602 getcredhostname(struct ucred *cred, char *buf, size_t size) 3603 { 3604 struct prison *pr; 3605 3606 /* 3607 * A NULL credential can be used to shortcut to the physical 3608 * system's hostname. 3609 */ 3610 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3611 mtx_lock(&pr->pr_mtx); 3612 strlcpy(buf, pr->pr_hostname, size); 3613 mtx_unlock(&pr->pr_mtx); 3614 } 3615 3616 void 3617 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3618 { 3619 3620 mtx_lock(&cred->cr_prison->pr_mtx); 3621 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3622 mtx_unlock(&cred->cr_prison->pr_mtx); 3623 } 3624 3625 void 3626 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3627 { 3628 3629 mtx_lock(&cred->cr_prison->pr_mtx); 3630 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3631 mtx_unlock(&cred->cr_prison->pr_mtx); 3632 } 3633 3634 void 3635 getcredhostid(struct ucred *cred, unsigned long *hostid) 3636 { 3637 3638 mtx_lock(&cred->cr_prison->pr_mtx); 3639 *hostid = cred->cr_prison->pr_hostid; 3640 mtx_unlock(&cred->cr_prison->pr_mtx); 3641 } 3642 3643 void 3644 getjailname(struct ucred *cred, char *name, size_t len) 3645 { 3646 3647 mtx_lock(&cred->cr_prison->pr_mtx); 3648 strlcpy(name, cred->cr_prison->pr_name, len); 3649 mtx_unlock(&cred->cr_prison->pr_mtx); 3650 } 3651 3652 #ifdef VIMAGE 3653 /* 3654 * Determine whether the prison represented by cred owns 3655 * its vnet rather than having it inherited. 3656 * 3657 * Returns true in case the prison owns the vnet, false otherwise. 3658 */ 3659 bool 3660 prison_owns_vnet(struct ucred *cred) 3661 { 3662 3663 /* 3664 * vnets cannot be added/removed after jail creation, 3665 * so no need to lock here. 3666 */ 3667 return ((cred->cr_prison->pr_flags & PR_VNET) != 0); 3668 } 3669 #endif 3670 3671 /* 3672 * Determine whether the subject represented by cred can "see" 3673 * status of a mount point. 3674 * Returns: 0 for permitted, ENOENT otherwise. 3675 * XXX: This function should be called cr_canseemount() and should be 3676 * placed in kern_prot.c. 3677 */ 3678 int 3679 prison_canseemount(struct ucred *cred, struct mount *mp) 3680 { 3681 struct prison *pr; 3682 struct statfs *sp; 3683 size_t len; 3684 3685 pr = cred->cr_prison; 3686 if (pr->pr_enforce_statfs == 0) 3687 return (0); 3688 if (pr->pr_root->v_mount == mp) 3689 return (0); 3690 if (pr->pr_enforce_statfs == 2) 3691 return (ENOENT); 3692 /* 3693 * If jail's chroot directory is set to "/" we should be able to see 3694 * all mount-points from inside a jail. 3695 * This is ugly check, but this is the only situation when jail's 3696 * directory ends with '/'. 3697 */ 3698 if (strcmp(pr->pr_path, "/") == 0) 3699 return (0); 3700 len = strlen(pr->pr_path); 3701 sp = &mp->mnt_stat; 3702 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3703 return (ENOENT); 3704 /* 3705 * Be sure that we don't have situation where jail's root directory 3706 * is "/some/path" and mount point is "/some/pathpath". 3707 */ 3708 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3709 return (ENOENT); 3710 return (0); 3711 } 3712 3713 void 3714 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3715 { 3716 char jpath[MAXPATHLEN]; 3717 struct prison *pr; 3718 size_t len; 3719 3720 pr = cred->cr_prison; 3721 if (pr->pr_enforce_statfs == 0) 3722 return; 3723 if (prison_canseemount(cred, mp) != 0) { 3724 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3725 strlcpy(sp->f_mntonname, "[restricted]", 3726 sizeof(sp->f_mntonname)); 3727 return; 3728 } 3729 if (pr->pr_root->v_mount == mp) { 3730 /* 3731 * Clear current buffer data, so we are sure nothing from 3732 * the valid path left there. 3733 */ 3734 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3735 *sp->f_mntonname = '/'; 3736 return; 3737 } 3738 /* 3739 * If jail's chroot directory is set to "/" we should be able to see 3740 * all mount-points from inside a jail. 3741 */ 3742 if (strcmp(pr->pr_path, "/") == 0) 3743 return; 3744 len = strlen(pr->pr_path); 3745 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3746 /* 3747 * Clear current buffer data, so we are sure nothing from 3748 * the valid path left there. 3749 */ 3750 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3751 if (*jpath == '\0') { 3752 /* Should never happen. */ 3753 *sp->f_mntonname = '/'; 3754 } else { 3755 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3756 } 3757 } 3758 3759 /* 3760 * Check with permission for a specific privilege is granted within jail. We 3761 * have a specific list of accepted privileges; the rest are denied. 3762 */ 3763 int 3764 prison_priv_check(struct ucred *cred, int priv) 3765 { 3766 struct prison *pr; 3767 int error; 3768 3769 /* 3770 * Some policies have custom handlers. This routine should not be 3771 * called for them. See priv_check_cred(). 3772 */ 3773 switch (priv) { 3774 case PRIV_VFS_LOOKUP: 3775 case PRIV_VFS_GENERATION: 3776 KASSERT(0, ("prison_priv_check instead of a custom handler " 3777 "called for %d\n", priv)); 3778 } 3779 3780 if (!jailed(cred)) 3781 return (0); 3782 3783 #ifdef VIMAGE 3784 /* 3785 * Privileges specific to prisons with a virtual network stack. 3786 * There might be a duplicate entry here in case the privilege 3787 * is only granted conditionally in the legacy jail case. 3788 */ 3789 switch (priv) { 3790 /* 3791 * NFS-specific privileges. 3792 */ 3793 case PRIV_NFS_DAEMON: 3794 case PRIV_VFS_GETFH: 3795 case PRIV_VFS_MOUNT_EXPORTED: 3796 if (!prison_check_nfsd(cred)) 3797 return (EPERM); 3798 #ifdef notyet 3799 case PRIV_NFS_LOCKD: 3800 #endif 3801 /* 3802 * Network stack privileges. 3803 */ 3804 case PRIV_NET_BRIDGE: 3805 case PRIV_NET_GRE: 3806 case PRIV_NET_BPF: 3807 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3808 case PRIV_NET_ROUTE: 3809 case PRIV_NET_TAP: 3810 case PRIV_NET_SETIFMTU: 3811 case PRIV_NET_SETIFFLAGS: 3812 case PRIV_NET_SETIFCAP: 3813 case PRIV_NET_SETIFDESCR: 3814 case PRIV_NET_SETIFNAME : 3815 case PRIV_NET_SETIFMETRIC: 3816 case PRIV_NET_SETIFPHYS: 3817 case PRIV_NET_SETIFMAC: 3818 case PRIV_NET_SETLANPCP: 3819 case PRIV_NET_ADDMULTI: 3820 case PRIV_NET_DELMULTI: 3821 case PRIV_NET_HWIOCTL: 3822 case PRIV_NET_SETLLADDR: 3823 case PRIV_NET_ADDIFGROUP: 3824 case PRIV_NET_DELIFGROUP: 3825 case PRIV_NET_IFCREATE: 3826 case PRIV_NET_IFDESTROY: 3827 case PRIV_NET_ADDIFADDR: 3828 case PRIV_NET_DELIFADDR: 3829 case PRIV_NET_LAGG: 3830 case PRIV_NET_GIF: 3831 case PRIV_NET_SETIFVNET: 3832 case PRIV_NET_SETIFFIB: 3833 case PRIV_NET_OVPN: 3834 case PRIV_NET_ME: 3835 case PRIV_NET_WG: 3836 3837 /* 3838 * 802.11-related privileges. 3839 */ 3840 case PRIV_NET80211_VAP_GETKEY: 3841 case PRIV_NET80211_VAP_MANAGE: 3842 3843 #ifdef notyet 3844 /* 3845 * ATM privileges. 3846 */ 3847 case PRIV_NETATM_CFG: 3848 case PRIV_NETATM_ADD: 3849 case PRIV_NETATM_DEL: 3850 case PRIV_NETATM_SET: 3851 3852 /* 3853 * Bluetooth privileges. 3854 */ 3855 case PRIV_NETBLUETOOTH_RAW: 3856 #endif 3857 3858 /* 3859 * Netgraph and netgraph module privileges. 3860 */ 3861 case PRIV_NETGRAPH_CONTROL: 3862 #ifdef notyet 3863 case PRIV_NETGRAPH_TTY: 3864 #endif 3865 3866 /* 3867 * IPv4 and IPv6 privileges. 3868 */ 3869 case PRIV_NETINET_IPFW: 3870 case PRIV_NETINET_DIVERT: 3871 case PRIV_NETINET_PF: 3872 case PRIV_NETINET_DUMMYNET: 3873 case PRIV_NETINET_CARP: 3874 case PRIV_NETINET_MROUTE: 3875 case PRIV_NETINET_RAW: 3876 case PRIV_NETINET_ADDRCTRL6: 3877 case PRIV_NETINET_ND6: 3878 case PRIV_NETINET_SCOPE6: 3879 case PRIV_NETINET_ALIFETIME6: 3880 case PRIV_NETINET_IPSEC: 3881 case PRIV_NETINET_BINDANY: 3882 3883 #ifdef notyet 3884 /* 3885 * NCP privileges. 3886 */ 3887 case PRIV_NETNCP: 3888 3889 /* 3890 * SMB privileges. 3891 */ 3892 case PRIV_NETSMB: 3893 #endif 3894 3895 /* 3896 * No default: or deny here. 3897 * In case of no permit fall through to next switch(). 3898 */ 3899 if (cred->cr_prison->pr_flags & PR_VNET) 3900 return (0); 3901 } 3902 #endif /* VIMAGE */ 3903 3904 switch (priv) { 3905 /* 3906 * Allow ktrace privileges for root in jail. 3907 */ 3908 case PRIV_KTRACE: 3909 3910 #if 0 3911 /* 3912 * Allow jailed processes to configure audit identity and 3913 * submit audit records (login, etc). In the future we may 3914 * want to further refine the relationship between audit and 3915 * jail. 3916 */ 3917 case PRIV_AUDIT_GETAUDIT: 3918 case PRIV_AUDIT_SETAUDIT: 3919 case PRIV_AUDIT_SUBMIT: 3920 #endif 3921 3922 /* 3923 * Allow jailed processes to manipulate process UNIX 3924 * credentials in any way they see fit. 3925 */ 3926 case PRIV_CRED_SETUID: 3927 case PRIV_CRED_SETEUID: 3928 case PRIV_CRED_SETGID: 3929 case PRIV_CRED_SETEGID: 3930 case PRIV_CRED_SETGROUPS: 3931 case PRIV_CRED_SETREUID: 3932 case PRIV_CRED_SETREGID: 3933 case PRIV_CRED_SETRESUID: 3934 case PRIV_CRED_SETRESGID: 3935 3936 /* 3937 * Jail implements visibility constraints already, so allow 3938 * jailed root to override uid/gid-based constraints. 3939 */ 3940 case PRIV_SEEOTHERGIDS: 3941 case PRIV_SEEOTHERUIDS: 3942 3943 /* 3944 * Jail implements inter-process debugging limits already, so 3945 * allow jailed root various debugging privileges. 3946 */ 3947 case PRIV_DEBUG_DIFFCRED: 3948 case PRIV_DEBUG_SUGID: 3949 case PRIV_DEBUG_UNPRIV: 3950 3951 /* 3952 * Allow jail to set various resource limits and login 3953 * properties, and for now, exceed process resource limits. 3954 */ 3955 case PRIV_PROC_LIMIT: 3956 case PRIV_PROC_SETLOGIN: 3957 case PRIV_PROC_SETRLIMIT: 3958 3959 /* 3960 * System V and POSIX IPC privileges are granted in jail. 3961 */ 3962 case PRIV_IPC_READ: 3963 case PRIV_IPC_WRITE: 3964 case PRIV_IPC_ADMIN: 3965 case PRIV_IPC_MSGSIZE: 3966 case PRIV_MQ_ADMIN: 3967 3968 /* 3969 * Jail operations within a jail work on child jails. 3970 */ 3971 case PRIV_JAIL_ATTACH: 3972 case PRIV_JAIL_SET: 3973 case PRIV_JAIL_REMOVE: 3974 3975 /* 3976 * Jail implements its own inter-process limits, so allow 3977 * root processes in jail to change scheduling on other 3978 * processes in the same jail. Likewise for signalling. 3979 */ 3980 case PRIV_SCHED_DIFFCRED: 3981 case PRIV_SCHED_CPUSET: 3982 case PRIV_SIGNAL_DIFFCRED: 3983 case PRIV_SIGNAL_SUGID: 3984 3985 /* 3986 * Allow jailed processes to write to sysctls marked as jail 3987 * writable. 3988 */ 3989 case PRIV_SYSCTL_WRITEJAIL: 3990 3991 /* 3992 * Allow root in jail to manage a variety of quota 3993 * properties. These should likely be conditional on a 3994 * configuration option. 3995 */ 3996 case PRIV_VFS_GETQUOTA: 3997 case PRIV_VFS_SETQUOTA: 3998 3999 /* 4000 * Since Jail relies on chroot() to implement file system 4001 * protections, grant many VFS privileges to root in jail. 4002 * Be careful to exclude mount-related and NFS-related 4003 * privileges. 4004 */ 4005 case PRIV_VFS_READ: 4006 case PRIV_VFS_WRITE: 4007 case PRIV_VFS_ADMIN: 4008 case PRIV_VFS_EXEC: 4009 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 4010 case PRIV_VFS_CHFLAGS_DEV: 4011 case PRIV_VFS_CHOWN: 4012 case PRIV_VFS_CHROOT: 4013 case PRIV_VFS_RETAINSUGID: 4014 case PRIV_VFS_FCHROOT: 4015 case PRIV_VFS_LINK: 4016 case PRIV_VFS_SETGID: 4017 case PRIV_VFS_STAT: 4018 case PRIV_VFS_STICKYFILE: 4019 4020 /* 4021 * As in the non-jail case, non-root users are expected to be 4022 * able to read kernel/physical memory (provided /dev/[k]mem 4023 * exists in the jail and they have permission to access it). 4024 */ 4025 case PRIV_KMEM_READ: 4026 return (0); 4027 4028 /* 4029 * Depending on the global setting, allow privilege of 4030 * setting system flags. 4031 */ 4032 case PRIV_VFS_SYSFLAGS: 4033 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 4034 return (0); 4035 else 4036 return (EPERM); 4037 4038 /* 4039 * Depending on the global setting, allow privilege of 4040 * mounting/unmounting file systems. 4041 */ 4042 case PRIV_VFS_MOUNT: 4043 case PRIV_VFS_UNMOUNT: 4044 case PRIV_VFS_MOUNT_NONUSER: 4045 case PRIV_VFS_MOUNT_OWNER: 4046 pr = cred->cr_prison; 4047 prison_lock(pr); 4048 if (pr->pr_allow & PR_ALLOW_MOUNT && pr->pr_enforce_statfs < 2) 4049 error = 0; 4050 else 4051 error = EPERM; 4052 prison_unlock(pr); 4053 return (error); 4054 4055 /* 4056 * Jails should hold no disposition on the PRIV_VFS_READ_DIR 4057 * policy. priv_check_cred will not specifically allow it, and 4058 * we may want a MAC policy to allow it. 4059 */ 4060 case PRIV_VFS_READ_DIR: 4061 return (0); 4062 4063 /* 4064 * Conditionally allow privileged process in the jail to 4065 * manipulate filesystem extended attributes in the system 4066 * namespace. 4067 */ 4068 case PRIV_VFS_EXTATTR_SYSTEM: 4069 if ((cred->cr_prison->pr_allow & PR_ALLOW_EXTATTR) != 0) 4070 return (0); 4071 else 4072 return (EPERM); 4073 4074 /* 4075 * Conditionnaly allow locking (unlocking) physical pages 4076 * in memory. 4077 */ 4078 case PRIV_VM_MLOCK: 4079 case PRIV_VM_MUNLOCK: 4080 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK) 4081 return (0); 4082 else 4083 return (EPERM); 4084 4085 /* 4086 * Conditionally allow jailed root to bind reserved ports. 4087 */ 4088 case PRIV_NETINET_RESERVEDPORT: 4089 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS) 4090 return (0); 4091 else 4092 return (EPERM); 4093 4094 /* 4095 * Allow jailed root to reuse in-use ports. 4096 */ 4097 case PRIV_NETINET_REUSEPORT: 4098 return (0); 4099 4100 /* 4101 * Allow jailed root to set certain IPv4/6 (option) headers. 4102 */ 4103 case PRIV_NETINET_SETHDROPTS: 4104 return (0); 4105 4106 /* 4107 * Conditionally allow creating raw sockets in jail. 4108 */ 4109 case PRIV_NETINET_RAW: 4110 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 4111 return (0); 4112 else 4113 return (EPERM); 4114 4115 /* 4116 * Since jail implements its own visibility limits on netstat 4117 * sysctls, allow getcred. This allows identd to work in 4118 * jail. 4119 */ 4120 case PRIV_NETINET_GETCRED: 4121 return (0); 4122 4123 /* 4124 * Allow jailed root to set loginclass. 4125 */ 4126 case PRIV_PROC_SETLOGINCLASS: 4127 return (0); 4128 4129 /* 4130 * Do not allow a process inside a jail to read the kernel 4131 * message buffer unless explicitly permitted. 4132 */ 4133 case PRIV_MSGBUF: 4134 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF) 4135 return (0); 4136 return (EPERM); 4137 4138 default: 4139 /* 4140 * In all remaining cases, deny the privilege request. This 4141 * includes almost all network privileges, many system 4142 * configuration privileges. 4143 */ 4144 return (EPERM); 4145 } 4146 } 4147 4148 /* 4149 * Return the part of pr2's name that is relative to pr1, or the whole name 4150 * if it does not directly follow. 4151 */ 4152 4153 char * 4154 prison_name(struct prison *pr1, struct prison *pr2) 4155 { 4156 char *name; 4157 4158 /* Jails see themselves as "0" (if they see themselves at all). */ 4159 if (pr1 == pr2) 4160 return "0"; 4161 name = pr2->pr_name; 4162 if (prison_ischild(pr1, pr2)) { 4163 /* 4164 * pr1 isn't locked (and allprison_lock may not be either) 4165 * so its length can't be counted on. But the number of dots 4166 * can be counted on - and counted. 4167 */ 4168 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 4169 name = strchr(name, '.') + 1; 4170 } 4171 return (name); 4172 } 4173 4174 /* 4175 * Return the part of pr2's path that is relative to pr1, or the whole path 4176 * if it does not directly follow. 4177 */ 4178 static char * 4179 prison_path(struct prison *pr1, struct prison *pr2) 4180 { 4181 char *path1, *path2; 4182 int len1; 4183 4184 path1 = pr1->pr_path; 4185 path2 = pr2->pr_path; 4186 if (!strcmp(path1, "/")) 4187 return (path2); 4188 len1 = strlen(path1); 4189 if (strncmp(path1, path2, len1)) 4190 return (path2); 4191 if (path2[len1] == '\0') 4192 return "/"; 4193 if (path2[len1] == '/') 4194 return (path2 + len1); 4195 return (path2); 4196 } 4197 4198 /* 4199 * Jail-related sysctls. 4200 */ 4201 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 4202 "Jails"); 4203 4204 #if defined(INET) || defined(INET6) 4205 /* 4206 * Copy address array to memory that would be then SYSCTL_OUT-ed. 4207 * sysctl_jail_list() helper. 4208 */ 4209 static void 4210 prison_ip_copyout(struct prison *pr, const pr_family_t af, void **out, int *len) 4211 { 4212 const struct prison_ip *pip; 4213 const size_t size = pr_families[af].size; 4214 4215 again: 4216 mtx_assert(&pr->pr_mtx, MA_OWNED); 4217 if ((pip = pr->pr_addrs[af]) != NULL) { 4218 if (*len < pip->ips) { 4219 *len = pip->ips; 4220 mtx_unlock(&pr->pr_mtx); 4221 *out = realloc(*out, *len * size, M_TEMP, M_WAITOK); 4222 mtx_lock(&pr->pr_mtx); 4223 goto again; 4224 } 4225 bcopy(pip->pr_ip, *out, pip->ips * size); 4226 } 4227 } 4228 #endif 4229 4230 static int 4231 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4232 { 4233 struct xprison *xp; 4234 struct prison *pr, *cpr; 4235 #ifdef INET 4236 struct in_addr *ip4 = NULL; 4237 int ip4s = 0; 4238 #endif 4239 #ifdef INET6 4240 struct in6_addr *ip6 = NULL; 4241 int ip6s = 0; 4242 #endif 4243 int descend, error; 4244 4245 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4246 pr = req->td->td_ucred->cr_prison; 4247 error = 0; 4248 sx_slock(&allprison_lock); 4249 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4250 mtx_lock(&cpr->pr_mtx); 4251 #ifdef INET 4252 prison_ip_copyout(cpr, PR_INET, (void **)&ip4, &ip4s); 4253 #endif 4254 #ifdef INET6 4255 prison_ip_copyout(cpr, PR_INET6, (void **)&ip6, &ip6s); 4256 #endif 4257 bzero(xp, sizeof(*xp)); 4258 xp->pr_version = XPRISON_VERSION; 4259 xp->pr_id = cpr->pr_id; 4260 xp->pr_state = cpr->pr_state; 4261 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4262 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4263 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4264 #ifdef INET 4265 xp->pr_ip4s = ip4s; 4266 #endif 4267 #ifdef INET6 4268 xp->pr_ip6s = ip6s; 4269 #endif 4270 mtx_unlock(&cpr->pr_mtx); 4271 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4272 if (error) 4273 break; 4274 #ifdef INET 4275 if (xp->pr_ip4s > 0) { 4276 error = SYSCTL_OUT(req, ip4, 4277 xp->pr_ip4s * sizeof(struct in_addr)); 4278 if (error) 4279 break; 4280 } 4281 #endif 4282 #ifdef INET6 4283 if (xp->pr_ip6s > 0) { 4284 error = SYSCTL_OUT(req, ip6, 4285 xp->pr_ip6s * sizeof(struct in6_addr)); 4286 if (error) 4287 break; 4288 } 4289 #endif 4290 } 4291 sx_sunlock(&allprison_lock); 4292 free(xp, M_TEMP); 4293 #ifdef INET 4294 free(ip4, M_TEMP); 4295 #endif 4296 #ifdef INET6 4297 free(ip6, M_TEMP); 4298 #endif 4299 return (error); 4300 } 4301 4302 SYSCTL_OID(_security_jail, OID_AUTO, list, 4303 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4304 sysctl_jail_list, "S", "List of active jails"); 4305 4306 static int 4307 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4308 { 4309 int error, injail; 4310 4311 injail = jailed(req->td->td_ucred); 4312 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4313 4314 return (error); 4315 } 4316 4317 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4318 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4319 sysctl_jail_jailed, "I", "Process in jail?"); 4320 4321 static int 4322 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4323 { 4324 int error, havevnet; 4325 #ifdef VIMAGE 4326 struct ucred *cred = req->td->td_ucred; 4327 4328 havevnet = jailed(cred) && prison_owns_vnet(cred); 4329 #else 4330 havevnet = 0; 4331 #endif 4332 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4333 4334 return (error); 4335 } 4336 4337 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4338 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4339 sysctl_jail_vnet, "I", "Jail owns vnet?"); 4340 4341 #if defined(INET) || defined(INET6) 4342 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4343 &jail_max_af_ips, 0, 4344 "Number of IP addresses a jail may have at most per address family (deprecated)"); 4345 #endif 4346 4347 /* 4348 * Default parameters for jail(2) compatibility. For historical reasons, 4349 * the sysctl names have varying similarity to the parameter names. Prisons 4350 * just see their own parameters, and can't change them. 4351 */ 4352 static int 4353 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4354 { 4355 int error, i; 4356 4357 /* Get the current flag value, and convert it to a boolean. */ 4358 if (req->td->td_ucred->cr_prison == &prison0) { 4359 mtx_lock(&prison0.pr_mtx); 4360 i = (jail_default_allow & arg2) != 0; 4361 mtx_unlock(&prison0.pr_mtx); 4362 } else 4363 i = prison_allow(req->td->td_ucred, arg2); 4364 4365 if (arg1 != NULL) 4366 i = !i; 4367 error = sysctl_handle_int(oidp, &i, 0, req); 4368 if (error || !req->newptr) 4369 return (error); 4370 i = i ? arg2 : 0; 4371 if (arg1 != NULL) 4372 i ^= arg2; 4373 /* 4374 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4375 * for writing. 4376 */ 4377 mtx_lock(&prison0.pr_mtx); 4378 jail_default_allow = (jail_default_allow & ~arg2) | i; 4379 mtx_unlock(&prison0.pr_mtx); 4380 return (0); 4381 } 4382 4383 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4384 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4385 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4386 "Processes in jail can set their hostnames (deprecated)"); 4387 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4388 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4389 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4390 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 4391 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4392 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4393 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4394 "Processes in jail can use System V IPC primitives (deprecated)"); 4395 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4396 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4397 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4398 "Prison root can create raw sockets (deprecated)"); 4399 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4400 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4401 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4402 "Processes in jail can alter system file flags (deprecated)"); 4403 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4404 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4405 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4406 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 4407 4408 static int 4409 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4410 { 4411 struct prison *pr; 4412 int level, error; 4413 4414 pr = req->td->td_ucred->cr_prison; 4415 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4416 error = sysctl_handle_int(oidp, &level, 0, req); 4417 if (error || !req->newptr) 4418 return (error); 4419 *(int *)arg1 = level; 4420 return (0); 4421 } 4422 4423 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4424 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4425 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4426 sysctl_jail_default_level, "I", 4427 "Processes in jail cannot see all mounted file systems (deprecated)"); 4428 4429 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4430 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4431 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4432 sysctl_jail_default_level, "I", 4433 "Ruleset for the devfs filesystem in jail (deprecated)"); 4434 4435 /* 4436 * Nodes to describe jail parameters. Maximum length of string parameters 4437 * is returned in the string itself, and the other parameters exist merely 4438 * to make themselves and their types known. 4439 */ 4440 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 4441 "Jail parameters"); 4442 4443 int 4444 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4445 { 4446 int i; 4447 long l; 4448 size_t s; 4449 char numbuf[12]; 4450 4451 switch (oidp->oid_kind & CTLTYPE) 4452 { 4453 case CTLTYPE_LONG: 4454 case CTLTYPE_ULONG: 4455 l = 0; 4456 #ifdef SCTL_MASK32 4457 if (!(req->flags & SCTL_MASK32)) 4458 #endif 4459 return (SYSCTL_OUT(req, &l, sizeof(l))); 4460 case CTLTYPE_INT: 4461 case CTLTYPE_UINT: 4462 i = 0; 4463 return (SYSCTL_OUT(req, &i, sizeof(i))); 4464 case CTLTYPE_STRING: 4465 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4466 return 4467 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4468 case CTLTYPE_STRUCT: 4469 s = (size_t)arg2; 4470 return (SYSCTL_OUT(req, &s, sizeof(s))); 4471 } 4472 return (0); 4473 } 4474 4475 /* 4476 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 4477 * jail creation time but cannot be changed in an existing jail. 4478 */ 4479 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4480 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4481 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4482 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4483 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4484 "I", "Jail secure level"); 4485 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 4486 "Jail value for kern.osreldate and uname -K"); 4487 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 4488 "Jail value for kern.osrelease and uname -r"); 4489 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4490 "I", "Jail cannot see all mounted file systems"); 4491 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4492 "I", "Ruleset for in-jail devfs mounts"); 4493 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4494 "B", "Jail persistence"); 4495 #ifdef VIMAGE 4496 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4497 "E,jailsys", "Virtual network stack"); 4498 #endif 4499 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4500 "B", "Jail is in the process of shutting down"); 4501 4502 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4503 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4504 "I", "Current number of child jails"); 4505 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4506 "I", "Maximum number of child jails"); 4507 4508 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4509 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4510 "Jail hostname"); 4511 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4512 "Jail NIS domainname"); 4513 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4514 "Jail host UUID"); 4515 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4516 "LU", "Jail host ID"); 4517 4518 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4519 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4520 4521 #ifdef INET 4522 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4523 "Jail IPv4 address virtualization"); 4524 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4525 "S,in_addr,a", "Jail IPv4 addresses"); 4526 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4527 "B", "Do (not) use IPv4 source address selection rather than the " 4528 "primary jail IPv4 address."); 4529 #endif 4530 #ifdef INET6 4531 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4532 "Jail IPv6 address virtualization"); 4533 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4534 "S,in6_addr,a", "Jail IPv6 addresses"); 4535 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4536 "B", "Do (not) use IPv6 source address selection rather than the " 4537 "primary jail IPv6 address."); 4538 #endif 4539 4540 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4541 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4542 "B", "Jail may set hostname"); 4543 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4544 "B", "Jail may use SYSV IPC"); 4545 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4546 "B", "Jail may create raw sockets"); 4547 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4548 "B", "Jail may alter system file flags"); 4549 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4550 "B", "Jail may set file quotas"); 4551 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4552 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4553 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW, 4554 "B", "Jail may lock (unlock) physical pages in memory"); 4555 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW, 4556 "B", "Jail may bind sockets to reserved ports"); 4557 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW, 4558 "B", "Jail may read the kernel message buffer"); 4559 SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW, 4560 "B", "Unprivileged processes may use process debugging facilities"); 4561 SYSCTL_JAIL_PARAM(_allow, suser, CTLTYPE_INT | CTLFLAG_RW, 4562 "B", "Processes in jail with uid 0 have privilege"); 4563 #ifdef VIMAGE 4564 SYSCTL_JAIL_PARAM(_allow, nfsd, CTLTYPE_INT | CTLFLAG_RW, 4565 "B", "Mountd/nfsd may run in the jail"); 4566 #endif 4567 SYSCTL_JAIL_PARAM(_allow, extattr, CTLTYPE_INT | CTLFLAG_RW, 4568 "B", "Jail may set system-level filesystem extended attributes"); 4569 4570 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4571 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4572 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4573 4574 /* 4575 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return 4576 * its associated bit in the pr_allow bitmask, or zero if the parameter was 4577 * not created. 4578 */ 4579 unsigned 4580 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr, 4581 const char *descr) 4582 { 4583 struct bool_flags *bf; 4584 struct sysctl_oid *parent; 4585 char *allow_name, *allow_noname, *allowed; 4586 #ifndef NO_SYSCTL_DESCR 4587 char *descr_deprecated; 4588 #endif 4589 u_int allow_flag; 4590 4591 if (prefix 4592 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name) 4593 < 0 || 4594 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name) 4595 < 0 4596 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 || 4597 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) { 4598 free(allow_name, M_PRISON); 4599 return 0; 4600 } 4601 4602 /* 4603 * See if this parameter has already beed added, i.e. a module was 4604 * previously loaded/unloaded. 4605 */ 4606 mtx_lock(&prison0.pr_mtx); 4607 for (bf = pr_flag_allow; 4608 bf < pr_flag_allow + nitems(pr_flag_allow) && 4609 atomic_load_int(&bf->flag) != 0; 4610 bf++) { 4611 if (strcmp(bf->name, allow_name) == 0) { 4612 allow_flag = bf->flag; 4613 goto no_add; 4614 } 4615 } 4616 4617 /* 4618 * Find a free bit in pr_allow_all, failing if there are none 4619 * (which shouldn't happen as long as we keep track of how many 4620 * potential dynamic flags exist). 4621 */ 4622 for (allow_flag = 1;; allow_flag <<= 1) { 4623 if (allow_flag == 0) 4624 goto no_add; 4625 if ((pr_allow_all & allow_flag) == 0) 4626 break; 4627 } 4628 4629 /* Note the parameter in the next open slot in pr_flag_allow. */ 4630 for (bf = pr_flag_allow; ; bf++) { 4631 if (bf == pr_flag_allow + nitems(pr_flag_allow)) { 4632 /* This should never happen, but is not fatal. */ 4633 allow_flag = 0; 4634 goto no_add; 4635 } 4636 if (atomic_load_int(&bf->flag) == 0) 4637 break; 4638 } 4639 bf->name = allow_name; 4640 bf->noname = allow_noname; 4641 pr_allow_all |= allow_flag; 4642 /* 4643 * prison0 always has permission for the new parameter. 4644 * Other jails must have it granted to them. 4645 */ 4646 prison0.pr_allow |= allow_flag; 4647 /* The flag indicates a valid entry, so make sure it is set last. */ 4648 atomic_store_rel_int(&bf->flag, allow_flag); 4649 mtx_unlock(&prison0.pr_mtx); 4650 4651 /* 4652 * Create sysctls for the parameter, and the back-compat global 4653 * permission. 4654 */ 4655 parent = prefix 4656 ? SYSCTL_ADD_NODE(NULL, 4657 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow), 4658 OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr) 4659 : &sysctl___security_jail_param_allow; 4660 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO, 4661 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4662 NULL, 0, sysctl_jail_param, "B", descr); 4663 if ((prefix 4664 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name) 4665 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) { 4666 #ifndef NO_SYSCTL_DESCR 4667 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)", 4668 descr); 4669 #endif 4670 (void)SYSCTL_ADD_PROC(NULL, 4671 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed, 4672 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag, 4673 sysctl_jail_default_allow, "I", descr_deprecated); 4674 #ifndef NO_SYSCTL_DESCR 4675 free(descr_deprecated, M_TEMP); 4676 #endif 4677 free(allowed, M_TEMP); 4678 } 4679 return allow_flag; 4680 4681 no_add: 4682 mtx_unlock(&prison0.pr_mtx); 4683 free(allow_name, M_PRISON); 4684 free(allow_noname, M_PRISON); 4685 return allow_flag; 4686 } 4687 4688 /* 4689 * The VFS system will register jail-aware filesystems here. They each get 4690 * a parameter allow.mount.xxxfs and a flag to check when a jailed user 4691 * attempts to mount. 4692 */ 4693 void 4694 prison_add_vfs(struct vfsconf *vfsp) 4695 { 4696 #ifdef NO_SYSCTL_DESCR 4697 4698 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 4699 NULL, NULL); 4700 #else 4701 char *descr; 4702 4703 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system", 4704 vfsp->vfc_name); 4705 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 4706 NULL, descr); 4707 free(descr, M_TEMP); 4708 #endif 4709 } 4710 4711 #ifdef RACCT 4712 void 4713 prison_racct_foreach(void (*callback)(struct racct *racct, 4714 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 4715 void *arg2, void *arg3) 4716 { 4717 struct prison_racct *prr; 4718 4719 ASSERT_RACCT_ENABLED(); 4720 4721 sx_slock(&allprison_lock); 4722 if (pre != NULL) 4723 (pre)(); 4724 LIST_FOREACH(prr, &allprison_racct, prr_next) 4725 (callback)(prr->prr_racct, arg2, arg3); 4726 if (post != NULL) 4727 (post)(); 4728 sx_sunlock(&allprison_lock); 4729 } 4730 4731 static struct prison_racct * 4732 prison_racct_find_locked(const char *name) 4733 { 4734 struct prison_racct *prr; 4735 4736 ASSERT_RACCT_ENABLED(); 4737 sx_assert(&allprison_lock, SA_XLOCKED); 4738 4739 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4740 return (NULL); 4741 4742 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4743 if (strcmp(name, prr->prr_name) != 0) 4744 continue; 4745 4746 /* Found prison_racct with a matching name? */ 4747 prison_racct_hold(prr); 4748 return (prr); 4749 } 4750 4751 /* Add new prison_racct. */ 4752 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4753 racct_create(&prr->prr_racct); 4754 4755 strcpy(prr->prr_name, name); 4756 refcount_init(&prr->prr_refcount, 1); 4757 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4758 4759 return (prr); 4760 } 4761 4762 struct prison_racct * 4763 prison_racct_find(const char *name) 4764 { 4765 struct prison_racct *prr; 4766 4767 ASSERT_RACCT_ENABLED(); 4768 4769 sx_xlock(&allprison_lock); 4770 prr = prison_racct_find_locked(name); 4771 sx_xunlock(&allprison_lock); 4772 return (prr); 4773 } 4774 4775 void 4776 prison_racct_hold(struct prison_racct *prr) 4777 { 4778 4779 ASSERT_RACCT_ENABLED(); 4780 4781 refcount_acquire(&prr->prr_refcount); 4782 } 4783 4784 static void 4785 prison_racct_free_locked(struct prison_racct *prr) 4786 { 4787 4788 ASSERT_RACCT_ENABLED(); 4789 sx_assert(&allprison_lock, SA_XLOCKED); 4790 4791 if (refcount_release(&prr->prr_refcount)) { 4792 racct_destroy(&prr->prr_racct); 4793 LIST_REMOVE(prr, prr_next); 4794 free(prr, M_PRISON_RACCT); 4795 } 4796 } 4797 4798 void 4799 prison_racct_free(struct prison_racct *prr) 4800 { 4801 4802 ASSERT_RACCT_ENABLED(); 4803 sx_assert(&allprison_lock, SA_UNLOCKED); 4804 4805 if (refcount_release_if_not_last(&prr->prr_refcount)) 4806 return; 4807 4808 sx_xlock(&allprison_lock); 4809 prison_racct_free_locked(prr); 4810 sx_xunlock(&allprison_lock); 4811 } 4812 4813 static void 4814 prison_racct_attach(struct prison *pr) 4815 { 4816 struct prison_racct *prr; 4817 4818 ASSERT_RACCT_ENABLED(); 4819 sx_assert(&allprison_lock, SA_XLOCKED); 4820 4821 prr = prison_racct_find_locked(pr->pr_name); 4822 KASSERT(prr != NULL, ("cannot find prison_racct")); 4823 4824 pr->pr_prison_racct = prr; 4825 } 4826 4827 /* 4828 * Handle jail renaming. From the racct point of view, renaming means 4829 * moving from one prison_racct to another. 4830 */ 4831 static void 4832 prison_racct_modify(struct prison *pr) 4833 { 4834 #ifdef RCTL 4835 struct proc *p; 4836 struct ucred *cred; 4837 #endif 4838 struct prison_racct *oldprr; 4839 4840 ASSERT_RACCT_ENABLED(); 4841 4842 sx_slock(&allproc_lock); 4843 sx_xlock(&allprison_lock); 4844 4845 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4846 sx_xunlock(&allprison_lock); 4847 sx_sunlock(&allproc_lock); 4848 return; 4849 } 4850 4851 oldprr = pr->pr_prison_racct; 4852 pr->pr_prison_racct = NULL; 4853 4854 prison_racct_attach(pr); 4855 4856 /* 4857 * Move resource utilisation records. 4858 */ 4859 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4860 4861 #ifdef RCTL 4862 /* 4863 * Force rctl to reattach rules to processes. 4864 */ 4865 FOREACH_PROC_IN_SYSTEM(p) { 4866 PROC_LOCK(p); 4867 cred = crhold(p->p_ucred); 4868 PROC_UNLOCK(p); 4869 rctl_proc_ucred_changed(p, cred); 4870 crfree(cred); 4871 } 4872 #endif 4873 4874 sx_sunlock(&allproc_lock); 4875 prison_racct_free_locked(oldprr); 4876 sx_xunlock(&allprison_lock); 4877 } 4878 4879 static void 4880 prison_racct_detach(struct prison *pr) 4881 { 4882 4883 ASSERT_RACCT_ENABLED(); 4884 sx_assert(&allprison_lock, SA_UNLOCKED); 4885 4886 if (pr->pr_prison_racct == NULL) 4887 return; 4888 prison_racct_free(pr->pr_prison_racct); 4889 pr->pr_prison_racct = NULL; 4890 } 4891 #endif /* RACCT */ 4892 4893 #ifdef DDB 4894 4895 static void 4896 db_show_prison(struct prison *pr) 4897 { 4898 struct bool_flags *bf; 4899 struct jailsys_flags *jsf; 4900 #if defined(INET) || defined(INET6) 4901 int ii; 4902 struct prison_ip *pip; 4903 #endif 4904 unsigned f; 4905 #ifdef INET 4906 char ip4buf[INET_ADDRSTRLEN]; 4907 #endif 4908 #ifdef INET6 4909 char ip6buf[INET6_ADDRSTRLEN]; 4910 #endif 4911 4912 db_printf("prison %p:\n", pr); 4913 db_printf(" jid = %d\n", pr->pr_id); 4914 db_printf(" name = %s\n", pr->pr_name); 4915 db_printf(" parent = %p\n", pr->pr_parent); 4916 db_printf(" ref = %d\n", pr->pr_ref); 4917 db_printf(" uref = %d\n", pr->pr_uref); 4918 db_printf(" state = %s\n", 4919 pr->pr_state == PRISON_STATE_ALIVE ? "alive" : 4920 pr->pr_state == PRISON_STATE_DYING ? "dying" : 4921 "invalid"); 4922 db_printf(" path = %s\n", pr->pr_path); 4923 db_printf(" cpuset = %d\n", pr->pr_cpuset 4924 ? pr->pr_cpuset->cs_id : -1); 4925 #ifdef VIMAGE 4926 db_printf(" vnet = %p\n", pr->pr_vnet); 4927 #endif 4928 db_printf(" root = %p\n", pr->pr_root); 4929 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4930 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4931 db_printf(" children.max = %d\n", pr->pr_childmax); 4932 db_printf(" children.cur = %d\n", pr->pr_childcount); 4933 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4934 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4935 db_printf(" flags = 0x%x", pr->pr_flags); 4936 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++) 4937 if (pr->pr_flags & bf->flag) 4938 db_printf(" %s", bf->name); 4939 for (jsf = pr_flag_jailsys; 4940 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 4941 jsf++) { 4942 f = pr->pr_flags & (jsf->disable | jsf->new); 4943 db_printf(" %-16s= %s\n", jsf->name, 4944 (f != 0 && f == jsf->disable) ? "disable" 4945 : (f == jsf->new) ? "new" 4946 : "inherit"); 4947 } 4948 db_printf(" allow = 0x%x", pr->pr_allow); 4949 for (bf = pr_flag_allow; 4950 bf < pr_flag_allow + nitems(pr_flag_allow) && 4951 atomic_load_int(&bf->flag) != 0; 4952 bf++) 4953 if (pr->pr_allow & bf->flag) 4954 db_printf(" %s", bf->name); 4955 db_printf("\n"); 4956 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4957 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4958 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4959 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4960 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4961 #ifdef INET 4962 if ((pip = pr->pr_addrs[PR_INET]) != NULL) { 4963 db_printf(" ip4s = %d\n", pip->ips); 4964 for (ii = 0; ii < pip->ips; ii++) 4965 db_printf(" %s %s\n", 4966 ii == 0 ? "ip4.addr =" : " ", 4967 inet_ntoa_r( 4968 *(const struct in_addr *)PR_IP(pip, PR_INET, ii), 4969 ip4buf)); 4970 } 4971 #endif 4972 #ifdef INET6 4973 if ((pip = pr->pr_addrs[PR_INET6]) != NULL) { 4974 db_printf(" ip6s = %d\n", pip->ips); 4975 for (ii = 0; ii < pip->ips; ii++) 4976 db_printf(" %s %s\n", 4977 ii == 0 ? "ip6.addr =" : " ", 4978 ip6_sprintf(ip6buf, 4979 (const struct in6_addr *)PR_IP(pip, PR_INET6, ii))); 4980 } 4981 #endif 4982 } 4983 4984 DB_SHOW_COMMAND(prison, db_show_prison_command) 4985 { 4986 struct prison *pr; 4987 4988 if (!have_addr) { 4989 /* 4990 * Show all prisons in the list, and prison0 which is not 4991 * listed. 4992 */ 4993 db_show_prison(&prison0); 4994 if (!db_pager_quit) { 4995 TAILQ_FOREACH(pr, &allprison, pr_list) { 4996 db_show_prison(pr); 4997 if (db_pager_quit) 4998 break; 4999 } 5000 } 5001 return; 5002 } 5003 5004 if (addr == 0) 5005 pr = &prison0; 5006 else { 5007 /* Look for a prison with the ID and with references. */ 5008 TAILQ_FOREACH(pr, &allprison, pr_list) 5009 if (pr->pr_id == addr && pr->pr_ref > 0) 5010 break; 5011 if (pr == NULL) 5012 /* Look again, without requiring a reference. */ 5013 TAILQ_FOREACH(pr, &allprison, pr_list) 5014 if (pr->pr_id == addr) 5015 break; 5016 if (pr == NULL) 5017 /* Assume address points to a valid prison. */ 5018 pr = (struct prison *)addr; 5019 } 5020 db_show_prison(pr); 5021 } 5022 5023 #endif /* DDB */ 5024