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