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 int lastdeadid = 0; 140 141 static int get_next_prid(struct prison **insprp); 142 static int get_next_deadid(struct prison **insprp); 143 static int do_jail_attach(struct thread *td, struct prison *pr, int drflags); 144 static void prison_complete(void *context, int pending); 145 static void prison_deref(struct prison *pr, int flags); 146 static void prison_deref_kill(struct prison *pr, struct prisonlist *freeprison); 147 static int prison_lock_xlock(struct prison *pr, int flags); 148 static void prison_cleanup(struct prison *pr); 149 static void prison_free_not_last(struct prison *pr); 150 static void prison_proc_free_not_last(struct prison *pr); 151 static void prison_proc_relink(struct prison *opr, struct prison *npr, 152 struct proc *p); 153 static void prison_set_allow_locked(struct prison *pr, unsigned flag, 154 int enable); 155 static char *prison_path(struct prison *pr1, struct prison *pr2); 156 #ifdef RACCT 157 static void prison_racct_attach(struct prison *pr); 158 static void prison_racct_modify(struct prison *pr); 159 static void prison_racct_detach(struct prison *pr); 160 #endif 161 162 /* Flags for prison_deref */ 163 #define PD_DEREF 0x01 /* Decrement pr_ref */ 164 #define PD_DEUREF 0x02 /* Decrement pr_uref */ 165 #define PD_KILL 0x04 /* Remove jail, kill processes, etc */ 166 #define PD_LOCKED 0x10 /* pr_mtx is held */ 167 #define PD_LIST_SLOCKED 0x20 /* allprison_lock is held shared */ 168 #define PD_LIST_XLOCKED 0x40 /* allprison_lock is held exclusive */ 169 #define PD_OP_FLAGS 0x07 /* Operation flags */ 170 #define PD_LOCK_FLAGS 0x70 /* Lock status flags */ 171 172 /* 173 * Parameter names corresponding to PR_* flag values. Size values are for kvm 174 * as we cannot figure out the size of a sparse array, or an array without a 175 * terminating entry. 176 */ 177 static struct bool_flags pr_flag_bool[] = { 178 {"persist", "nopersist", PR_PERSIST}, 179 #ifdef INET 180 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL}, 181 #endif 182 #ifdef INET6 183 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL}, 184 #endif 185 }; 186 const size_t pr_flag_bool_size = sizeof(pr_flag_bool); 187 188 static struct jailsys_flags pr_flag_jailsys[] = { 189 {"host", 0, PR_HOST}, 190 #ifdef VIMAGE 191 {"vnet", 0, PR_VNET}, 192 #endif 193 #ifdef INET 194 {"ip4", PR_IP4_USER, PR_IP4_USER}, 195 #endif 196 #ifdef INET6 197 {"ip6", PR_IP6_USER, PR_IP6_USER}, 198 #endif 199 }; 200 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 201 202 /* 203 * Make this array full-size so dynamic parameters can be added. 204 * It is protected by prison0.mtx, but lockless reading is allowed 205 * with an atomic check of the flag values. 206 */ 207 static struct bool_flags pr_flag_allow[NBBY * NBPW] = { 208 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME}, 209 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC}, 210 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS}, 211 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS}, 212 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT}, 213 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS}, 214 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF}, 215 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK}, 216 {"allow.reserved_ports", "allow.noreserved_ports", 217 PR_ALLOW_RESERVED_PORTS}, 218 {"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF}, 219 {"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug", 220 PR_ALLOW_UNPRIV_DEBUG}, 221 {"allow.suser", "allow.nosuser", PR_ALLOW_SUSER}, 222 #ifdef VIMAGE 223 {"allow.nfsd", "allow.nonfsd", PR_ALLOW_NFSD}, 224 #endif 225 {"allow.extattr", "allow.noextattr", PR_ALLOW_EXTATTR}, 226 {"allow.adjtime", "allow.noadjtime", PR_ALLOW_ADJTIME}, 227 {"allow.settime", "allow.nosettime", PR_ALLOW_SETTIME}, 228 }; 229 static unsigned pr_allow_all = PR_ALLOW_ALL_STATIC; 230 const size_t pr_flag_allow_size = sizeof(pr_flag_allow); 231 232 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \ 233 PR_ALLOW_RESERVED_PORTS | \ 234 PR_ALLOW_UNPRIV_DEBUG | \ 235 PR_ALLOW_SUSER) 236 #define JAIL_DEFAULT_ENFORCE_STATFS 2 237 #define JAIL_DEFAULT_DEVFS_RSNUM 0 238 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 239 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 240 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 241 #if defined(INET) || defined(INET6) 242 static unsigned jail_max_af_ips = 255; 243 #endif 244 245 /* 246 * Initialize the parts of prison0 that can't be static-initialized with 247 * constants. This is called from proc0_init() after creating thread0 cpuset. 248 */ 249 void 250 prison0_init(void) 251 { 252 uint8_t *file, *data; 253 size_t size; 254 char buf[sizeof(prison0.pr_hostuuid)]; 255 bool valid; 256 257 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 258 prison0.pr_osreldate = osreldate; 259 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 260 261 /* If we have a preloaded hostuuid, use it. */ 262 file = preload_search_by_type(PRISON0_HOSTUUID_MODULE); 263 if (file != NULL) { 264 data = preload_fetch_addr(file); 265 size = preload_fetch_size(file); 266 if (data != NULL) { 267 /* 268 * The preloaded data may include trailing whitespace, almost 269 * certainly a newline; skip over any whitespace or 270 * non-printable characters to be safe. 271 */ 272 while (size > 0 && data[size - 1] <= 0x20) { 273 size--; 274 } 275 276 valid = false; 277 278 /* 279 * Not NUL-terminated when passed from loader, but 280 * validate_uuid requires that due to using sscanf (as 281 * does the subsequent strlcpy, since it still reads 282 * past the given size to return the true length); 283 * bounce to a temporary buffer to fix. 284 */ 285 if (size >= sizeof(buf)) 286 goto done; 287 288 memcpy(buf, data, size); 289 buf[size] = '\0'; 290 291 if (validate_uuid(buf, size, NULL, 0) != 0) 292 goto done; 293 294 valid = true; 295 (void)strlcpy(prison0.pr_hostuuid, buf, 296 sizeof(prison0.pr_hostuuid)); 297 298 done: 299 if (bootverbose && !valid) { 300 printf("hostuuid: preload data malformed: '%.*s'\n", 301 (int)size, data); 302 } 303 } 304 } 305 if (bootverbose) 306 printf("hostuuid: using %s\n", prison0.pr_hostuuid); 307 } 308 309 /* 310 * struct jail_args { 311 * struct jail *jail; 312 * }; 313 */ 314 int 315 sys_jail(struct thread *td, struct jail_args *uap) 316 { 317 uint32_t version; 318 int error; 319 struct jail j; 320 321 error = copyin(uap->jail, &version, sizeof(uint32_t)); 322 if (error) 323 return (error); 324 325 switch (version) { 326 case 0: 327 { 328 struct jail_v0 j0; 329 330 /* FreeBSD single IPv4 jails. */ 331 bzero(&j, sizeof(struct jail)); 332 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 333 if (error) 334 return (error); 335 j.version = j0.version; 336 j.path = j0.path; 337 j.hostname = j0.hostname; 338 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 339 break; 340 } 341 342 case 1: 343 /* 344 * Version 1 was used by multi-IPv4 jail implementations 345 * that never made it into the official kernel. 346 */ 347 return (EINVAL); 348 349 case 2: /* JAIL_API_VERSION */ 350 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 351 error = copyin(uap->jail, &j, sizeof(struct jail)); 352 if (error) 353 return (error); 354 break; 355 356 default: 357 /* Sci-Fi jails are not supported, sorry. */ 358 return (EINVAL); 359 } 360 return (kern_jail(td, &j)); 361 } 362 363 int 364 kern_jail(struct thread *td, struct jail *j) 365 { 366 struct iovec optiov[2 * (4 + nitems(pr_flag_allow) 367 #ifdef INET 368 + 1 369 #endif 370 #ifdef INET6 371 + 1 372 #endif 373 )]; 374 struct uio opt; 375 char *u_path, *u_hostname, *u_name; 376 struct bool_flags *bf; 377 #ifdef INET 378 uint32_t ip4s; 379 struct in_addr *u_ip4; 380 #endif 381 #ifdef INET6 382 struct in6_addr *u_ip6; 383 #endif 384 size_t tmplen; 385 int error, enforce_statfs; 386 387 bzero(&optiov, sizeof(optiov)); 388 opt.uio_iov = optiov; 389 opt.uio_iovcnt = 0; 390 opt.uio_offset = -1; 391 opt.uio_resid = -1; 392 opt.uio_segflg = UIO_SYSSPACE; 393 opt.uio_rw = UIO_READ; 394 opt.uio_td = td; 395 396 /* Set permissions for top-level jails from sysctls. */ 397 if (!jailed(td->td_ucred)) { 398 for (bf = pr_flag_allow; 399 bf < pr_flag_allow + nitems(pr_flag_allow) && 400 atomic_load_int(&bf->flag) != 0; 401 bf++) { 402 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *, 403 (jail_default_allow & bf->flag) 404 ? bf->name : bf->noname); 405 optiov[opt.uio_iovcnt].iov_len = 406 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 407 opt.uio_iovcnt += 2; 408 } 409 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 410 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 411 opt.uio_iovcnt++; 412 enforce_statfs = jail_default_enforce_statfs; 413 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 414 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 415 opt.uio_iovcnt++; 416 } 417 418 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 419 #ifdef INET 420 ip4s = (j->version == 0) ? 1 : j->ip4s; 421 if (ip4s > jail_max_af_ips) 422 return (EINVAL); 423 tmplen += ip4s * sizeof(struct in_addr); 424 #else 425 if (j->ip4s > 0) 426 return (EINVAL); 427 #endif 428 #ifdef INET6 429 if (j->ip6s > jail_max_af_ips) 430 return (EINVAL); 431 tmplen += j->ip6s * sizeof(struct in6_addr); 432 #else 433 if (j->ip6s > 0) 434 return (EINVAL); 435 #endif 436 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 437 u_hostname = u_path + MAXPATHLEN; 438 u_name = u_hostname + MAXHOSTNAMELEN; 439 #ifdef INET 440 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 441 #endif 442 #ifdef INET6 443 #ifdef INET 444 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 445 #else 446 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 447 #endif 448 #endif 449 optiov[opt.uio_iovcnt].iov_base = "path"; 450 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 451 opt.uio_iovcnt++; 452 optiov[opt.uio_iovcnt].iov_base = u_path; 453 error = copyinstr(j->path, u_path, MAXPATHLEN, 454 &optiov[opt.uio_iovcnt].iov_len); 455 if (error) { 456 free(u_path, M_TEMP); 457 return (error); 458 } 459 opt.uio_iovcnt++; 460 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 461 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 462 opt.uio_iovcnt++; 463 optiov[opt.uio_iovcnt].iov_base = u_hostname; 464 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 465 &optiov[opt.uio_iovcnt].iov_len); 466 if (error) { 467 free(u_path, M_TEMP); 468 return (error); 469 } 470 opt.uio_iovcnt++; 471 if (j->jailname != NULL) { 472 optiov[opt.uio_iovcnt].iov_base = "name"; 473 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 474 opt.uio_iovcnt++; 475 optiov[opt.uio_iovcnt].iov_base = u_name; 476 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 477 &optiov[opt.uio_iovcnt].iov_len); 478 if (error) { 479 free(u_path, M_TEMP); 480 return (error); 481 } 482 opt.uio_iovcnt++; 483 } 484 #ifdef INET 485 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 486 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 487 opt.uio_iovcnt++; 488 optiov[opt.uio_iovcnt].iov_base = u_ip4; 489 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 490 if (j->version == 0) 491 u_ip4->s_addr = j->ip4s; 492 else { 493 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 494 if (error) { 495 free(u_path, M_TEMP); 496 return (error); 497 } 498 } 499 opt.uio_iovcnt++; 500 #endif 501 #ifdef INET6 502 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 503 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 504 opt.uio_iovcnt++; 505 optiov[opt.uio_iovcnt].iov_base = u_ip6; 506 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 507 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 508 if (error) { 509 free(u_path, M_TEMP); 510 return (error); 511 } 512 opt.uio_iovcnt++; 513 #endif 514 KASSERT(opt.uio_iovcnt <= nitems(optiov), 515 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 516 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 517 free(u_path, M_TEMP); 518 return (error); 519 } 520 521 /* 522 * struct jail_set_args { 523 * struct iovec *iovp; 524 * unsigned int iovcnt; 525 * int flags; 526 * }; 527 */ 528 int 529 sys_jail_set(struct thread *td, struct jail_set_args *uap) 530 { 531 struct uio *auio; 532 int error; 533 534 /* Check that we have an even number of iovecs. */ 535 if (uap->iovcnt & 1) 536 return (EINVAL); 537 538 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 539 if (error) 540 return (error); 541 error = kern_jail_set(td, auio, uap->flags); 542 freeuio(auio); 543 return (error); 544 } 545 546 #if defined(INET) || defined(INET6) 547 typedef int prison_addr_cmp_t(const void *, const void *); 548 typedef bool prison_addr_valid_t(const void *); 549 static const struct pr_family { 550 size_t size; 551 prison_addr_cmp_t *cmp; 552 prison_addr_valid_t *valid; 553 int ip_flag; 554 } pr_families[PR_FAMILY_MAX] = { 555 #ifdef INET 556 [PR_INET] = { 557 .size = sizeof(struct in_addr), 558 .cmp = prison_qcmp_v4, 559 .valid = prison_valid_v4, 560 .ip_flag = PR_IP4_USER, 561 }, 562 #endif 563 #ifdef INET6 564 [PR_INET6] = { 565 .size = sizeof(struct in6_addr), 566 .cmp = prison_qcmp_v6, 567 .valid = prison_valid_v6, 568 .ip_flag = PR_IP6_USER, 569 }, 570 #endif 571 }; 572 573 /* 574 * Network address lists (pr_addrs) allocation for jails. The addresses 575 * are accessed locklessly by the network stack, thus need to be protected by 576 * the network epoch. 577 */ 578 struct prison_ip { 579 struct epoch_context ctx; 580 uint32_t ips; 581 #ifdef FUTURE_C 582 /* 583 * XXX Variable-length automatic arrays in union may be 584 * supported in future C. 585 */ 586 union { 587 char pr_ip[]; 588 struct in_addr pr_ip4[]; 589 struct in6_addr pr_ip6[]; 590 }; 591 #else /* No future C :( */ 592 char pr_ip[]; 593 #endif 594 }; 595 596 static char * 597 PR_IP(struct prison_ip *pip, const pr_family_t af, int idx) 598 { 599 MPASS(pip); 600 MPASS(af < PR_FAMILY_MAX); 601 MPASS(idx >= 0 && idx < pip->ips); 602 603 return (pip->pr_ip + pr_families[af].size * idx); 604 } 605 606 static struct prison_ip * 607 prison_ip_alloc(const pr_family_t af, uint32_t cnt, int flags) 608 { 609 struct prison_ip *pip; 610 611 pip = malloc(sizeof(struct prison_ip) + cnt * pr_families[af].size, 612 M_PRISON, flags); 613 if (pip != NULL) 614 pip->ips = cnt; 615 return (pip); 616 } 617 618 /* 619 * Allocate and copyin user supplied address list, sorting and validating. 620 * kern_jail_set() helper. 621 */ 622 static struct prison_ip * 623 prison_ip_copyin(const pr_family_t af, void *op, uint32_t cnt) 624 { 625 prison_addr_cmp_t *const cmp = pr_families[af].cmp; 626 const size_t size = pr_families[af].size; 627 struct prison_ip *pip; 628 629 pip = prison_ip_alloc(af, cnt, M_WAITOK); 630 bcopy(op, pip->pr_ip, cnt * size); 631 /* 632 * IP addresses are all sorted but ip[0] to preserve 633 * the primary IP address as given from userland. 634 * This special IP is used for unbound outgoing 635 * connections as well for "loopback" traffic in case 636 * source address selection cannot find any more fitting 637 * address to connect from. 638 */ 639 if (cnt > 1) 640 qsort(PR_IP(pip, af, 1), cnt - 1, size, cmp); 641 /* 642 * Check for duplicate addresses and do some simple 643 * zero and broadcast checks. If users give other bogus 644 * addresses it is their problem. 645 */ 646 for (int i = 0; i < cnt; i++) { 647 if (!pr_families[af].valid(PR_IP(pip, af, i))) { 648 free(pip, M_PRISON); 649 return (NULL); 650 } 651 if (i + 1 < cnt && 652 (cmp(PR_IP(pip, af, 0), PR_IP(pip, af, i + 1)) == 0 || 653 cmp(PR_IP(pip, af, i), PR_IP(pip, af, i + 1)) == 0)) { 654 free(pip, M_PRISON); 655 return (NULL); 656 } 657 } 658 659 return (pip); 660 } 661 662 /* 663 * Allocate and dup parent prison address list. 664 * kern_jail_set() helper. 665 */ 666 static void 667 prison_ip_dup(struct prison *ppr, struct prison *pr, const pr_family_t af) 668 { 669 const struct prison_ip *ppip = ppr->pr_addrs[af]; 670 struct prison_ip *pip; 671 672 if (ppip != NULL) { 673 pip = prison_ip_alloc(af, ppip->ips, M_WAITOK); 674 bcopy(ppip->pr_ip, pip->pr_ip, pip->ips * pr_families[af].size); 675 pr->pr_addrs[af] = pip; 676 } 677 } 678 679 /* 680 * Make sure the new set of IP addresses is a subset of the parent's list. 681 * Don't worry about the parent being unlocked, as any setting is done with 682 * allprison_lock held. 683 * kern_jail_set() helper. 684 */ 685 static bool 686 prison_ip_parent_match(struct prison_ip *ppip, struct prison_ip *pip, 687 const pr_family_t af) 688 { 689 prison_addr_cmp_t *const cmp = pr_families[af].cmp; 690 int i, j; 691 692 if (ppip == NULL) 693 return (false); 694 695 for (i = 0; i < ppip->ips; i++) 696 if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, i)) == 0) 697 break; 698 699 if (i == ppip->ips) 700 /* Main address not present in parent. */ 701 return (false); 702 703 if (pip->ips > 1) { 704 for (i = j = 1; i < pip->ips; i++) { 705 if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0) 706 /* Equals to parent primary address. */ 707 continue; 708 for (; j < ppip->ips; j++) 709 if (cmp(PR_IP(pip, af, i), 710 PR_IP(ppip, af, j)) == 0) 711 break; 712 if (j == ppip->ips) 713 break; 714 } 715 if (j == ppip->ips) 716 /* Address not present in parent. */ 717 return (false); 718 } 719 return (true); 720 } 721 722 /* 723 * Check for conflicting IP addresses. We permit them if there is no more 724 * than one IP on each jail. If there is a duplicate on a jail with more 725 * than one IP stop checking and return error. 726 * kern_jail_set() helper. 727 */ 728 static bool 729 prison_ip_conflict_check(const struct prison *ppr, const struct prison *pr, 730 struct prison_ip *pip, pr_family_t af) 731 { 732 const struct prison *tppr, *tpr; 733 int descend; 734 735 #ifdef VIMAGE 736 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent) 737 if (tppr->pr_flags & PR_VNET) 738 break; 739 #else 740 tppr = &prison0; 741 #endif 742 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 743 if (tpr == pr || 744 #ifdef VIMAGE 745 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 746 #endif 747 !prison_isalive(tpr)) { 748 descend = 0; 749 continue; 750 } 751 if (!(tpr->pr_flags & pr_families[af].ip_flag)) 752 continue; 753 descend = 0; 754 if (tpr->pr_addrs[af] == NULL || 755 (pip->ips == 1 && tpr->pr_addrs[af]->ips == 1)) 756 continue; 757 for (int i = 0; i < pip->ips; i++) 758 if (prison_ip_check(tpr, af, PR_IP(pip, af, i)) == 0) 759 return (false); 760 } 761 762 return (true); 763 } 764 765 _Static_assert(offsetof(struct prison_ip, ctx) == 0, 766 "prison must start with epoch context"); 767 static void 768 prison_ip_free_deferred(epoch_context_t ctx) 769 { 770 771 free(ctx, M_PRISON); 772 } 773 774 static void 775 prison_ip_free(struct prison_ip *pip) 776 { 777 778 if (pip != NULL) 779 NET_EPOCH_CALL(prison_ip_free_deferred, &pip->ctx); 780 } 781 782 static void 783 prison_ip_set(struct prison *pr, const pr_family_t af, struct prison_ip *new) 784 { 785 struct prison_ip **mem, *old; 786 787 mtx_assert(&pr->pr_mtx, MA_OWNED); 788 789 mem = &pr->pr_addrs[af]; 790 791 old = *mem; 792 atomic_store_ptr(mem, new); 793 prison_ip_free(old); 794 } 795 796 /* 797 * Restrict a prison's IP address list with its parent's, possibly replacing 798 * it. Return true if succeed, otherwise should redo. 799 * kern_jail_set() helper. 800 */ 801 static bool 802 prison_ip_restrict(struct prison *pr, const pr_family_t af, 803 struct prison_ip **newp) 804 { 805 struct prison_ip *ppip = pr->pr_parent->pr_addrs[af]; 806 struct prison_ip *pip = pr->pr_addrs[af]; 807 int (*const cmp)(const void *, const void *) = pr_families[af].cmp; 808 const size_t size = pr_families[af].size; 809 struct prison_ip *new = newp != NULL ? *newp : NULL; 810 uint32_t ips; 811 812 mtx_assert(&pr->pr_mtx, MA_OWNED); 813 814 /* 815 * Due to epoch-synchronized access to the IP address lists we always 816 * allocate a new list even if the old one has enough space. We could 817 * atomically update an IPv4 address inside a list, but that would 818 * screw up sorting, and in case of IPv6 we can't even atomically write 819 * one. 820 */ 821 if (ppip == NULL) { 822 if (pip != NULL) 823 prison_ip_set(pr, af, NULL); 824 return (true); 825 } 826 827 if (!(pr->pr_flags & pr_families[af].ip_flag)) { 828 if (new == NULL) { 829 new = prison_ip_alloc(af, ppip->ips, M_NOWAIT); 830 if (new == NULL) 831 return (false); /* Redo */ 832 } 833 /* This has no user settings, so just copy the parent's list. */ 834 MPASS(new->ips == ppip->ips); 835 bcopy(ppip->pr_ip, new->pr_ip, ppip->ips * size); 836 prison_ip_set(pr, af, new); 837 if (newp != NULL) 838 *newp = NULL; /* Used */ 839 } else if (pip != NULL) { 840 /* Remove addresses that aren't in the parent. */ 841 int i; 842 843 i = 0; /* index in pip */ 844 ips = 0; /* index in new */ 845 846 if (new == NULL) { 847 new = prison_ip_alloc(af, pip->ips, M_NOWAIT); 848 if (new == NULL) 849 return (false); /* Redo */ 850 } 851 852 for (int pi = 0; pi < ppip->ips; pi++) 853 if (cmp(PR_IP(pip, af, 0), PR_IP(ppip, af, pi)) == 0) { 854 /* Found our primary address in parent. */ 855 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips), 856 size); 857 i++; 858 ips++; 859 break; 860 } 861 for (int pi = 1; i < pip->ips; ) { 862 /* Check against primary, which is unsorted. */ 863 if (cmp(PR_IP(pip, af, i), PR_IP(ppip, af, 0)) == 0) { 864 /* Matches parent's primary address. */ 865 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips), 866 size); 867 i++; 868 ips++; 869 continue; 870 } 871 /* The rest are sorted. */ 872 switch (pi >= ppip->ips ? -1 : 873 cmp(PR_IP(pip, af, i), PR_IP(ppip, af, pi))) { 874 case -1: 875 i++; 876 break; 877 case 0: 878 bcopy(PR_IP(pip, af, i), PR_IP(new, af, ips), 879 size); 880 i++; 881 pi++; 882 ips++; 883 break; 884 case 1: 885 pi++; 886 break; 887 } 888 } 889 if (ips == 0) { 890 if (newp == NULL || *newp == NULL) 891 prison_ip_free(new); 892 new = NULL; 893 } else { 894 /* Shrink to real size */ 895 KASSERT((new->ips >= ips), 896 ("Out-of-bounds write to prison_ip %p", new)); 897 new->ips = ips; 898 } 899 prison_ip_set(pr, af, new); 900 if (newp != NULL) 901 *newp = NULL; /* Used */ 902 } 903 return (true); 904 } 905 906 /* 907 * Fast-path check if an address belongs to a prison. 908 */ 909 int 910 prison_ip_check(const struct prison *pr, const pr_family_t af, 911 const void *addr) 912 { 913 int (*const cmp)(const void *, const void *) = pr_families[af].cmp; 914 struct prison_ip *pip; 915 int i, a, z, d; 916 917 MPASS(mtx_owned(&pr->pr_mtx) || 918 in_epoch(net_epoch_preempt) || 919 sx_xlocked(&allprison_lock)); 920 921 pip = atomic_load_ptr(&pr->pr_addrs[af]); 922 if (__predict_false(pip == NULL)) 923 return (EAFNOSUPPORT); 924 925 /* Check the primary IP. */ 926 if (cmp(PR_IP(pip, af, 0), addr) == 0) 927 return (0); 928 929 /* 930 * All the other IPs are sorted so we can do a binary search. 931 */ 932 a = 0; 933 z = pip->ips - 2; 934 while (a <= z) { 935 i = (a + z) / 2; 936 d = cmp(PR_IP(pip, af, i + 1), addr); 937 if (d > 0) 938 z = i - 1; 939 else if (d < 0) 940 a = i + 1; 941 else 942 return (0); 943 } 944 945 return (EADDRNOTAVAIL); 946 } 947 948 /* 949 * Grab primary IP. Historically required mutex, but nothing prevents 950 * us to support epoch-protected access. Is it used in fast path? 951 * in{6}_jail.c helper 952 */ 953 const void * 954 prison_ip_get0(const struct prison *pr, const pr_family_t af) 955 { 956 const struct prison_ip *pip = pr->pr_addrs[af]; 957 958 mtx_assert(&pr->pr_mtx, MA_OWNED); 959 MPASS(pip); 960 961 return (pip->pr_ip); 962 } 963 964 u_int 965 prison_ip_cnt(const struct prison *pr, const pr_family_t af) 966 { 967 968 return (pr->pr_addrs[af]->ips); 969 } 970 #endif /* defined(INET) || defined(INET6) */ 971 972 int 973 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 974 { 975 struct nameidata nd; 976 #ifdef INET 977 struct prison_ip *ip4; 978 #endif 979 #ifdef INET6 980 struct prison_ip *ip6; 981 #endif 982 struct vfsopt *opt; 983 struct vfsoptlist *opts; 984 struct prison *pr, *deadpr, *dinspr, *inspr, *mypr, *ppr, *tpr; 985 struct vnode *root; 986 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 987 char *g_path, *osrelstr; 988 struct bool_flags *bf; 989 struct jailsys_flags *jsf; 990 #if defined(INET) || defined(INET6) 991 void *op; 992 #endif 993 unsigned long hid; 994 size_t namelen, onamelen, pnamelen; 995 int created, cuflags, descend, drflags, enforce; 996 int error, errmsg_len, errmsg_pos; 997 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 998 int deadid, jid, jsys, len, level; 999 int childmax, osreldt, rsnum, slevel; 1000 #ifdef INET 1001 int ip4s; 1002 bool redo_ip4; 1003 #endif 1004 #ifdef INET6 1005 int ip6s; 1006 bool redo_ip6; 1007 #endif 1008 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 1009 uint64_t pr_allow_diff; 1010 unsigned tallow; 1011 char numbuf[12]; 1012 1013 error = priv_check(td, PRIV_JAIL_SET); 1014 if (!error && (flags & JAIL_ATTACH)) 1015 error = priv_check(td, PRIV_JAIL_ATTACH); 1016 if (error) 1017 return (error); 1018 mypr = td->td_ucred->cr_prison; 1019 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 1020 return (EPERM); 1021 if (flags & ~JAIL_SET_MASK) 1022 return (EINVAL); 1023 1024 /* 1025 * Check all the parameters before committing to anything. Not all 1026 * errors can be caught early, but we may as well try. Also, this 1027 * takes care of some expensive stuff (path lookup) before getting 1028 * the allprison lock. 1029 * 1030 * XXX Jails are not filesystems, and jail parameters are not mount 1031 * options. But it makes more sense to re-use the vfsopt code 1032 * than duplicate it under a different name. 1033 */ 1034 error = vfs_buildopts(optuio, &opts); 1035 if (error) 1036 return (error); 1037 #ifdef INET 1038 ip4 = NULL; 1039 #endif 1040 #ifdef INET6 1041 ip6 = NULL; 1042 #endif 1043 g_path = NULL; 1044 1045 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 1046 if (!cuflags) { 1047 error = EINVAL; 1048 vfs_opterror(opts, "no valid operation (create or update)"); 1049 goto done_errmsg; 1050 } 1051 1052 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1053 if (error == ENOENT) 1054 jid = 0; 1055 else if (error != 0) 1056 goto done_free; 1057 1058 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 1059 if (error == ENOENT) 1060 gotslevel = 0; 1061 else if (error != 0) 1062 goto done_free; 1063 else 1064 gotslevel = 1; 1065 1066 error = 1067 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 1068 if (error == ENOENT) 1069 gotchildmax = 0; 1070 else if (error != 0) 1071 goto done_free; 1072 else 1073 gotchildmax = 1; 1074 1075 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 1076 if (error == ENOENT) 1077 gotenforce = 0; 1078 else if (error != 0) 1079 goto done_free; 1080 else if (enforce < 0 || enforce > 2) { 1081 error = EINVAL; 1082 goto done_free; 1083 } else 1084 gotenforce = 1; 1085 1086 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 1087 if (error == ENOENT) 1088 gotrsnum = 0; 1089 else if (error != 0) 1090 goto done_free; 1091 else 1092 gotrsnum = 1; 1093 1094 pr_flags = ch_flags = 0; 1095 for (bf = pr_flag_bool; 1096 bf < pr_flag_bool + nitems(pr_flag_bool); 1097 bf++) { 1098 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag); 1099 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag); 1100 } 1101 ch_flags |= pr_flags; 1102 for (jsf = pr_flag_jailsys; 1103 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 1104 jsf++) { 1105 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys)); 1106 if (error == ENOENT) 1107 continue; 1108 if (error != 0) 1109 goto done_free; 1110 switch (jsys) { 1111 case JAIL_SYS_DISABLE: 1112 if (!jsf->disable) { 1113 error = EINVAL; 1114 goto done_free; 1115 } 1116 pr_flags |= jsf->disable; 1117 break; 1118 case JAIL_SYS_NEW: 1119 pr_flags |= jsf->new; 1120 break; 1121 case JAIL_SYS_INHERIT: 1122 break; 1123 default: 1124 error = EINVAL; 1125 goto done_free; 1126 } 1127 ch_flags |= jsf->new | jsf->disable; 1128 } 1129 if ((flags & (JAIL_CREATE | JAIL_ATTACH)) == JAIL_CREATE 1130 && !(pr_flags & PR_PERSIST)) { 1131 error = EINVAL; 1132 vfs_opterror(opts, "new jail must persist or attach"); 1133 goto done_errmsg; 1134 } 1135 #ifdef VIMAGE 1136 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 1137 error = EINVAL; 1138 vfs_opterror(opts, "vnet cannot be changed after creation"); 1139 goto done_errmsg; 1140 } 1141 #endif 1142 #ifdef INET 1143 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 1144 error = EINVAL; 1145 vfs_opterror(opts, "ip4 cannot be changed after creation"); 1146 goto done_errmsg; 1147 } 1148 #endif 1149 #ifdef INET6 1150 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 1151 error = EINVAL; 1152 vfs_opterror(opts, "ip6 cannot be changed after creation"); 1153 goto done_errmsg; 1154 } 1155 #endif 1156 1157 pr_allow = ch_allow = 0; 1158 for (bf = pr_flag_allow; 1159 bf < pr_flag_allow + nitems(pr_flag_allow) && 1160 atomic_load_int(&bf->flag) != 0; 1161 bf++) { 1162 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag); 1163 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag); 1164 } 1165 ch_allow |= pr_allow; 1166 1167 error = vfs_getopt(opts, "name", (void **)&name, &len); 1168 if (error == ENOENT) 1169 name = NULL; 1170 else if (error != 0) 1171 goto done_free; 1172 else { 1173 if (len == 0 || name[len - 1] != '\0') { 1174 error = EINVAL; 1175 goto done_free; 1176 } 1177 if (len > MAXHOSTNAMELEN) { 1178 error = ENAMETOOLONG; 1179 goto done_free; 1180 } 1181 } 1182 1183 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 1184 if (error == ENOENT) 1185 host = NULL; 1186 else if (error != 0) 1187 goto done_free; 1188 else { 1189 ch_flags |= PR_HOST; 1190 pr_flags |= PR_HOST; 1191 if (len == 0 || host[len - 1] != '\0') { 1192 error = EINVAL; 1193 goto done_free; 1194 } 1195 if (len > MAXHOSTNAMELEN) { 1196 error = ENAMETOOLONG; 1197 goto done_free; 1198 } 1199 } 1200 1201 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 1202 if (error == ENOENT) 1203 domain = NULL; 1204 else if (error != 0) 1205 goto done_free; 1206 else { 1207 ch_flags |= PR_HOST; 1208 pr_flags |= PR_HOST; 1209 if (len == 0 || domain[len - 1] != '\0') { 1210 error = EINVAL; 1211 goto done_free; 1212 } 1213 if (len > MAXHOSTNAMELEN) { 1214 error = ENAMETOOLONG; 1215 goto done_free; 1216 } 1217 } 1218 1219 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 1220 if (error == ENOENT) 1221 uuid = NULL; 1222 else if (error != 0) 1223 goto done_free; 1224 else { 1225 ch_flags |= PR_HOST; 1226 pr_flags |= PR_HOST; 1227 if (len == 0 || uuid[len - 1] != '\0') { 1228 error = EINVAL; 1229 goto done_free; 1230 } 1231 if (len > HOSTUUIDLEN) { 1232 error = ENAMETOOLONG; 1233 goto done_free; 1234 } 1235 } 1236 1237 #ifdef COMPAT_FREEBSD32 1238 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 1239 uint32_t hid32; 1240 1241 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 1242 hid = hid32; 1243 } else 1244 #endif 1245 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 1246 if (error == ENOENT) 1247 gothid = 0; 1248 else if (error != 0) 1249 goto done_free; 1250 else { 1251 gothid = 1; 1252 ch_flags |= PR_HOST; 1253 pr_flags |= PR_HOST; 1254 } 1255 1256 #ifdef INET 1257 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 1258 if (error == ENOENT) 1259 ip4s = 0; 1260 else if (error != 0) 1261 goto done_free; 1262 else if (ip4s & (sizeof(struct in_addr) - 1)) { 1263 error = EINVAL; 1264 goto done_free; 1265 } else { 1266 ch_flags |= PR_IP4_USER; 1267 pr_flags |= PR_IP4_USER; 1268 if (ip4s > 0) { 1269 ip4s /= sizeof(struct in_addr); 1270 if (ip4s > jail_max_af_ips) { 1271 error = EINVAL; 1272 vfs_opterror(opts, "too many IPv4 addresses"); 1273 goto done_errmsg; 1274 } 1275 ip4 = prison_ip_copyin(PR_INET, op, ip4s); 1276 if (ip4 == NULL) { 1277 error = EINVAL; 1278 goto done_free; 1279 } 1280 } 1281 } 1282 #endif 1283 1284 #ifdef INET6 1285 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 1286 if (error == ENOENT) 1287 ip6s = 0; 1288 else if (error != 0) 1289 goto done_free; 1290 else if (ip6s & (sizeof(struct in6_addr) - 1)) { 1291 error = EINVAL; 1292 goto done_free; 1293 } else { 1294 ch_flags |= PR_IP6_USER; 1295 pr_flags |= PR_IP6_USER; 1296 if (ip6s > 0) { 1297 ip6s /= sizeof(struct in6_addr); 1298 if (ip6s > jail_max_af_ips) { 1299 error = EINVAL; 1300 vfs_opterror(opts, "too many IPv6 addresses"); 1301 goto done_errmsg; 1302 } 1303 ip6 = prison_ip_copyin(PR_INET6, op, ip6s); 1304 if (ip6 == NULL) { 1305 error = EINVAL; 1306 goto done_free; 1307 } 1308 } 1309 } 1310 #endif 1311 1312 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1313 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1314 error = EINVAL; 1315 vfs_opterror(opts, 1316 "vnet jails cannot have IP address restrictions"); 1317 goto done_errmsg; 1318 } 1319 #endif 1320 1321 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 1322 if (error == ENOENT) 1323 osrelstr = NULL; 1324 else if (error != 0) 1325 goto done_free; 1326 else { 1327 if (flags & JAIL_UPDATE) { 1328 error = EINVAL; 1329 vfs_opterror(opts, 1330 "osrelease cannot be changed after creation"); 1331 goto done_errmsg; 1332 } 1333 if (len == 0 || osrelstr[len - 1] != '\0') { 1334 error = EINVAL; 1335 goto done_free; 1336 } 1337 if (len >= OSRELEASELEN) { 1338 error = ENAMETOOLONG; 1339 vfs_opterror(opts, 1340 "osrelease string must be 1-%d bytes long", 1341 OSRELEASELEN - 1); 1342 goto done_errmsg; 1343 } 1344 } 1345 1346 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 1347 if (error == ENOENT) 1348 osreldt = 0; 1349 else if (error != 0) 1350 goto done_free; 1351 else { 1352 if (flags & JAIL_UPDATE) { 1353 error = EINVAL; 1354 vfs_opterror(opts, 1355 "osreldate cannot be changed after creation"); 1356 goto done_errmsg; 1357 } 1358 if (osreldt == 0) { 1359 error = EINVAL; 1360 vfs_opterror(opts, "osreldate cannot be 0"); 1361 goto done_errmsg; 1362 } 1363 } 1364 1365 root = NULL; 1366 error = vfs_getopt(opts, "path", (void **)&path, &len); 1367 if (error == ENOENT) 1368 path = NULL; 1369 else if (error != 0) 1370 goto done_free; 1371 else { 1372 if (flags & JAIL_UPDATE) { 1373 error = EINVAL; 1374 vfs_opterror(opts, 1375 "path cannot be changed after creation"); 1376 goto done_errmsg; 1377 } 1378 if (len == 0 || path[len - 1] != '\0') { 1379 error = EINVAL; 1380 goto done_free; 1381 } 1382 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path); 1383 error = namei(&nd); 1384 if (error) 1385 goto done_free; 1386 root = nd.ni_vp; 1387 NDFREE_PNBUF(&nd); 1388 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1389 strlcpy(g_path, path, MAXPATHLEN); 1390 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 1391 if (error == 0) { 1392 path = g_path; 1393 } else { 1394 /* exit on other errors */ 1395 goto done_free; 1396 } 1397 if (root->v_type != VDIR) { 1398 error = ENOTDIR; 1399 vput(root); 1400 goto done_free; 1401 } 1402 VOP_UNLOCK(root); 1403 } 1404 1405 /* 1406 * Find the specified jail, or at least its parent. 1407 * This abuses the file error codes ENOENT and EEXIST. 1408 */ 1409 pr = NULL; 1410 inspr = NULL; 1411 deadpr = NULL; 1412 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 1413 namelc = strrchr(name, '.'); 1414 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 1415 if (*p != '\0') 1416 jid = 0; 1417 } 1418 sx_xlock(&allprison_lock); 1419 drflags = PD_LIST_XLOCKED; 1420 ppr = mypr; 1421 if (!prison_isalive(ppr)) { 1422 /* This jail is dying. This process will surely follow. */ 1423 error = EAGAIN; 1424 goto done_deref; 1425 } 1426 if (jid != 0) { 1427 if (jid < 0) { 1428 error = EINVAL; 1429 vfs_opterror(opts, "negative jid"); 1430 goto done_deref; 1431 } 1432 /* 1433 * See if a requested jid already exists. Keep track of 1434 * where it can be inserted later. 1435 */ 1436 TAILQ_FOREACH(inspr, &allprison, pr_list) { 1437 if (inspr->pr_id < jid) 1438 continue; 1439 if (inspr->pr_id > jid) 1440 break; 1441 if (prison_isalive(inspr)) { 1442 pr = inspr; 1443 mtx_lock(&pr->pr_mtx); 1444 drflags |= PD_LOCKED; 1445 } else { 1446 /* Note a dying jail to handle later. */ 1447 deadpr = inspr; 1448 } 1449 inspr = NULL; 1450 break; 1451 } 1452 if (cuflags == JAIL_CREATE && pr != NULL) { 1453 /* 1454 * Even creators that cannot see the jail will 1455 * get EEXIST. 1456 */ 1457 error = EEXIST; 1458 vfs_opterror(opts, "jail %d already exists", jid); 1459 goto done_deref; 1460 } 1461 if ((pr == NULL) 1462 ? cuflags == JAIL_UPDATE 1463 : !prison_ischild(mypr, pr)) { 1464 /* 1465 * Updaters get ENOENT for nonexistent jails, 1466 * or for jails they cannot see. The latter 1467 * case is true even for CREATE | UPDATE, 1468 * which normally cannot give this error. 1469 */ 1470 error = ENOENT; 1471 vfs_opterror(opts, "jail %d not found", jid); 1472 goto done_deref; 1473 } 1474 } 1475 /* 1476 * If the caller provided a name, look for a jail by that name. 1477 * This has different semantics for creates and updates keyed by jid 1478 * (where the name must not already exist in a different jail), 1479 * and updates keyed by the name itself (where the name must exist 1480 * because that is the jail being updated). 1481 */ 1482 namelc = NULL; 1483 if (name != NULL) { 1484 namelc = strrchr(name, '.'); 1485 if (namelc == NULL) 1486 namelc = name; 1487 else { 1488 /* 1489 * This is a hierarchical name. Split it into the 1490 * parent and child names, and make sure the parent 1491 * exists or matches an already found jail. 1492 */ 1493 if (pr != NULL) { 1494 if (strncmp(name, ppr->pr_name, namelc - name) 1495 || ppr->pr_name[namelc - name] != '\0') { 1496 error = EINVAL; 1497 vfs_opterror(opts, 1498 "cannot change jail's parent"); 1499 goto done_deref; 1500 } 1501 } else { 1502 *namelc = '\0'; 1503 ppr = prison_find_name(mypr, name); 1504 if (ppr == NULL) { 1505 error = ENOENT; 1506 vfs_opterror(opts, 1507 "jail \"%s\" not found", name); 1508 goto done_deref; 1509 } 1510 mtx_unlock(&ppr->pr_mtx); 1511 if (!prison_isalive(ppr)) { 1512 error = ENOENT; 1513 vfs_opterror(opts, 1514 "jail \"%s\" is dying", name); 1515 goto done_deref; 1516 } 1517 *namelc = '.'; 1518 } 1519 namelc++; 1520 } 1521 if (namelc[0] != '\0') { 1522 pnamelen = 1523 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1524 FOREACH_PRISON_CHILD(ppr, tpr) { 1525 if (tpr == pr || !prison_isalive(tpr) || 1526 strcmp(tpr->pr_name + pnamelen, namelc)) 1527 continue; 1528 if (cuflags == JAIL_CREATE || pr != NULL) { 1529 /* 1530 * Create, or update(jid): name must 1531 * not exist in an active sibling jail. 1532 */ 1533 error = EEXIST; 1534 vfs_opterror(opts, 1535 "jail \"%s\" already exists", name); 1536 goto done_deref; 1537 } 1538 /* Use this jail for updates. */ 1539 pr = tpr; 1540 mtx_lock(&pr->pr_mtx); 1541 drflags |= PD_LOCKED; 1542 break; 1543 } 1544 /* 1545 * Update: name must exist if no jid is specified. 1546 * As with the jid case, the jail must be currently 1547 * visible, or else even CREATE | UPDATE will get 1548 * an error. 1549 */ 1550 if ((pr == NULL) 1551 ? cuflags == JAIL_UPDATE 1552 : !prison_isalive(pr)) { 1553 error = ENOENT; 1554 vfs_opterror(opts, "jail \"%s\" not found", 1555 name); 1556 goto done_deref; 1557 } 1558 } 1559 } 1560 /* Update: must provide a jid or name. */ 1561 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1562 error = ENOENT; 1563 vfs_opterror(opts, "update specified no jail"); 1564 goto done_deref; 1565 } 1566 1567 /* If there's no prison to update, create a new one and link it in. */ 1568 created = pr == NULL; 1569 if (created) { 1570 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1571 if (tpr->pr_childcount >= tpr->pr_childmax) { 1572 error = EPERM; 1573 vfs_opterror(opts, "prison limit exceeded"); 1574 goto done_deref; 1575 } 1576 1577 if (deadpr != NULL) { 1578 /* 1579 * The prison being created has the same ID as a dying 1580 * one. Handle this by giving the dying jail a new ID. 1581 * This may cause some confusion to user space, but 1582 * only to those listing dying jails. 1583 */ 1584 deadid = get_next_deadid(&dinspr); 1585 if (deadid == 0) { 1586 error = EAGAIN; 1587 vfs_opterror(opts, "no available jail IDs"); 1588 goto done_deref; 1589 } 1590 mtx_lock(&deadpr->pr_mtx); 1591 deadpr->pr_id = deadid; 1592 mtx_unlock(&deadpr->pr_mtx); 1593 if (dinspr == deadpr) 1594 inspr = deadpr; 1595 else { 1596 inspr = TAILQ_NEXT(deadpr, pr_list); 1597 TAILQ_REMOVE(&allprison, deadpr, pr_list); 1598 if (dinspr != NULL) 1599 TAILQ_INSERT_AFTER(&allprison, dinspr, 1600 deadpr, pr_list); 1601 else 1602 TAILQ_INSERT_HEAD(&allprison, deadpr, 1603 pr_list); 1604 } 1605 } 1606 if (jid == 0 && (jid = get_next_prid(&inspr)) == 0) { 1607 error = EAGAIN; 1608 vfs_opterror(opts, "no available jail IDs"); 1609 goto done_deref; 1610 } 1611 1612 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1613 pr->pr_state = PRISON_STATE_INVALID; 1614 refcount_init(&pr->pr_ref, 1); 1615 refcount_init(&pr->pr_uref, 0); 1616 drflags |= PD_DEREF; 1617 LIST_INIT(&pr->pr_children); 1618 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1619 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1620 1621 pr->pr_id = jid; 1622 if (inspr != NULL) 1623 TAILQ_INSERT_BEFORE(inspr, pr, pr_list); 1624 else 1625 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1626 1627 pr->pr_parent = ppr; 1628 prison_hold(ppr); 1629 prison_proc_hold(ppr); 1630 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1631 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1632 tpr->pr_childcount++; 1633 1634 /* Set some default values, and inherit some from the parent. */ 1635 if (namelc == NULL) 1636 namelc = ""; 1637 if (path == NULL) { 1638 path = "/"; 1639 root = mypr->pr_root; 1640 vref(root); 1641 } 1642 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1643 pr->pr_flags |= PR_HOST; 1644 #if defined(INET) || defined(INET6) 1645 #ifdef VIMAGE 1646 if (!(pr_flags & PR_VNET)) 1647 #endif 1648 { 1649 #ifdef INET 1650 if (!(ch_flags & PR_IP4_USER)) 1651 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1652 else if (!(pr_flags & PR_IP4_USER)) { 1653 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1654 prison_ip_dup(ppr, pr, PR_INET); 1655 } 1656 #endif 1657 #ifdef INET6 1658 if (!(ch_flags & PR_IP6_USER)) 1659 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1660 else if (!(pr_flags & PR_IP6_USER)) { 1661 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1662 prison_ip_dup(ppr, pr, PR_INET6); 1663 } 1664 #endif 1665 } 1666 #endif 1667 /* Source address selection is always on by default. */ 1668 pr->pr_flags |= _PR_IP_SADDRSEL; 1669 1670 pr->pr_securelevel = ppr->pr_securelevel; 1671 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1672 pr->pr_enforce_statfs = jail_default_enforce_statfs; 1673 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1674 1675 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1676 if (osrelstr == NULL) 1677 strlcpy(pr->pr_osrelease, ppr->pr_osrelease, 1678 sizeof(pr->pr_osrelease)); 1679 else 1680 strlcpy(pr->pr_osrelease, osrelstr, 1681 sizeof(pr->pr_osrelease)); 1682 1683 #ifdef VIMAGE 1684 /* Allocate a new vnet if specified. */ 1685 pr->pr_vnet = (pr_flags & PR_VNET) 1686 ? vnet_alloc() : ppr->pr_vnet; 1687 #endif 1688 /* 1689 * Allocate a dedicated cpuset for each jail. 1690 * Unlike other initial settings, this may return an error. 1691 */ 1692 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1693 if (error) 1694 goto done_deref; 1695 1696 mtx_lock(&pr->pr_mtx); 1697 drflags |= PD_LOCKED; 1698 } else { 1699 /* 1700 * Grab a reference for existing prisons, to ensure they 1701 * continue to exist for the duration of the call. 1702 */ 1703 prison_hold(pr); 1704 drflags |= PD_DEREF; 1705 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1706 if ((pr->pr_flags & PR_VNET) && 1707 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1708 error = EINVAL; 1709 vfs_opterror(opts, 1710 "vnet jails cannot have IP address restrictions"); 1711 goto done_deref; 1712 } 1713 #endif 1714 #ifdef INET 1715 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1716 error = EINVAL; 1717 vfs_opterror(opts, 1718 "ip4 cannot be changed after creation"); 1719 goto done_deref; 1720 } 1721 #endif 1722 #ifdef INET6 1723 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1724 error = EINVAL; 1725 vfs_opterror(opts, 1726 "ip6 cannot be changed after creation"); 1727 goto done_deref; 1728 } 1729 #endif 1730 } 1731 1732 /* Do final error checking before setting anything. */ 1733 if (gotslevel) { 1734 if (slevel < ppr->pr_securelevel) { 1735 error = EPERM; 1736 goto done_deref; 1737 } 1738 } 1739 if (gotchildmax) { 1740 if (childmax >= ppr->pr_childmax) { 1741 error = EPERM; 1742 goto done_deref; 1743 } 1744 } 1745 if (gotenforce) { 1746 if (enforce < ppr->pr_enforce_statfs) { 1747 error = EPERM; 1748 goto done_deref; 1749 } 1750 } 1751 if (gotrsnum) { 1752 /* 1753 * devfs_rsnum is a uint16_t 1754 */ 1755 if (rsnum < 0 || rsnum > 65535) { 1756 error = EINVAL; 1757 goto done_deref; 1758 } 1759 /* 1760 * Nested jails always inherit parent's devfs ruleset 1761 */ 1762 if (jailed(td->td_ucred)) { 1763 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1764 error = EPERM; 1765 goto done_deref; 1766 } else 1767 rsnum = ppr->pr_devfs_rsnum; 1768 } 1769 } 1770 #ifdef INET 1771 if (ip4s > 0) { 1772 if ((ppr->pr_flags & PR_IP4) && 1773 !prison_ip_parent_match(ppr->pr_addrs[PR_INET], ip4, 1774 PR_INET)) { 1775 error = EPERM; 1776 goto done_deref; 1777 } 1778 if (!prison_ip_conflict_check(ppr, pr, ip4, PR_INET)) { 1779 error = EADDRINUSE; 1780 vfs_opterror(opts, "IPv4 addresses clash"); 1781 goto done_deref; 1782 } 1783 } 1784 #endif 1785 #ifdef INET6 1786 if (ip6s > 0) { 1787 if ((ppr->pr_flags & PR_IP6) && 1788 !prison_ip_parent_match(ppr->pr_addrs[PR_INET6], ip6, 1789 PR_INET6)) { 1790 error = EPERM; 1791 goto done_deref; 1792 } 1793 if (!prison_ip_conflict_check(ppr, pr, ip6, PR_INET6)) { 1794 error = EADDRINUSE; 1795 vfs_opterror(opts, "IPv6 addresses clash"); 1796 goto done_deref; 1797 } 1798 } 1799 #endif 1800 onamelen = namelen = 0; 1801 if (namelc != NULL) { 1802 /* Give a default name of the jid. Also allow the name to be 1803 * explicitly the jid - but not any other number, and only in 1804 * normal form (no leading zero/etc). 1805 */ 1806 if (namelc[0] == '\0') 1807 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 1808 else if ((strtoul(namelc, &p, 10) != jid || 1809 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1810 error = EINVAL; 1811 vfs_opterror(opts, 1812 "name cannot be numeric (unless it is the jid)"); 1813 goto done_deref; 1814 } 1815 /* 1816 * Make sure the name isn't too long for the prison or its 1817 * children. 1818 */ 1819 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1820 onamelen = strlen(pr->pr_name + pnamelen); 1821 namelen = strlen(namelc); 1822 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1823 error = ENAMETOOLONG; 1824 goto done_deref; 1825 } 1826 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1827 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1828 sizeof(pr->pr_name)) { 1829 error = ENAMETOOLONG; 1830 goto done_deref; 1831 } 1832 } 1833 } 1834 pr_allow_diff = pr_allow & ~ppr->pr_allow; 1835 if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) { 1836 error = EPERM; 1837 goto done_deref; 1838 } 1839 1840 /* 1841 * Let modules check their parameters. This requires unlocking and 1842 * then re-locking the prison, but this is still a valid state as long 1843 * as allprison_lock remains xlocked. 1844 */ 1845 mtx_unlock(&pr->pr_mtx); 1846 drflags &= ~PD_LOCKED; 1847 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1848 if (error != 0) 1849 goto done_deref; 1850 mtx_lock(&pr->pr_mtx); 1851 drflags |= PD_LOCKED; 1852 1853 /* At this point, all valid parameters should have been noted. */ 1854 TAILQ_FOREACH(opt, opts, link) { 1855 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1856 error = EINVAL; 1857 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1858 goto done_deref; 1859 } 1860 } 1861 1862 /* Set the parameters of the prison. */ 1863 #ifdef INET 1864 redo_ip4 = false; 1865 if (pr_flags & PR_IP4_USER) { 1866 pr->pr_flags |= PR_IP4; 1867 prison_ip_set(pr, PR_INET, ip4); 1868 ip4 = NULL; 1869 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1870 #ifdef VIMAGE 1871 if (tpr->pr_flags & PR_VNET) { 1872 descend = 0; 1873 continue; 1874 } 1875 #endif 1876 if (!prison_ip_restrict(tpr, PR_INET, NULL)) { 1877 redo_ip4 = true; 1878 descend = 0; 1879 } 1880 } 1881 } 1882 #endif 1883 #ifdef INET6 1884 redo_ip6 = false; 1885 if (pr_flags & PR_IP6_USER) { 1886 pr->pr_flags |= PR_IP6; 1887 prison_ip_set(pr, PR_INET6, ip6); 1888 ip6 = NULL; 1889 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1890 #ifdef VIMAGE 1891 if (tpr->pr_flags & PR_VNET) { 1892 descend = 0; 1893 continue; 1894 } 1895 #endif 1896 if (!prison_ip_restrict(tpr, PR_INET6, NULL)) { 1897 redo_ip6 = true; 1898 descend = 0; 1899 } 1900 } 1901 } 1902 #endif 1903 if (gotslevel) { 1904 pr->pr_securelevel = slevel; 1905 /* Set all child jails to be at least this level. */ 1906 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1907 if (tpr->pr_securelevel < slevel) 1908 tpr->pr_securelevel = slevel; 1909 } 1910 if (gotchildmax) { 1911 pr->pr_childmax = childmax; 1912 /* Set all child jails to under this limit. */ 1913 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1914 if (tpr->pr_childmax > childmax - level) 1915 tpr->pr_childmax = childmax > level 1916 ? childmax - level : 0; 1917 } 1918 if (gotenforce) { 1919 pr->pr_enforce_statfs = enforce; 1920 /* Pass this restriction on to the children. */ 1921 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1922 if (tpr->pr_enforce_statfs < enforce) 1923 tpr->pr_enforce_statfs = enforce; 1924 } 1925 if (gotrsnum) { 1926 pr->pr_devfs_rsnum = rsnum; 1927 /* Pass this restriction on to the children. */ 1928 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1929 tpr->pr_devfs_rsnum = rsnum; 1930 } 1931 if (namelc != NULL) { 1932 if (ppr == &prison0) 1933 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1934 else 1935 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1936 ppr->pr_name, namelc); 1937 /* Change this component of child names. */ 1938 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1939 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1940 strlen(tpr->pr_name + onamelen) + 1); 1941 bcopy(pr->pr_name, tpr->pr_name, namelen); 1942 } 1943 } 1944 if (path != NULL) { 1945 /* Try to keep a real-rooted full pathname. */ 1946 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1947 pr->pr_root = root; 1948 root = NULL; 1949 } 1950 if (PR_HOST & ch_flags & ~pr_flags) { 1951 if (pr->pr_flags & PR_HOST) { 1952 /* 1953 * Copy the parent's host info. As with pr_ip4 above, 1954 * the lack of a lock on the parent is not a problem; 1955 * it is always set with allprison_lock at least 1956 * shared, and is held exclusively here. 1957 */ 1958 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1959 sizeof(pr->pr_hostname)); 1960 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1961 sizeof(pr->pr_domainname)); 1962 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1963 sizeof(pr->pr_hostuuid)); 1964 pr->pr_hostid = pr->pr_parent->pr_hostid; 1965 } 1966 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1967 /* Set this prison, and any descendants without PR_HOST. */ 1968 if (host != NULL) 1969 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1970 if (domain != NULL) 1971 strlcpy(pr->pr_domainname, domain, 1972 sizeof(pr->pr_domainname)); 1973 if (uuid != NULL) 1974 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1975 if (gothid) 1976 pr->pr_hostid = hid; 1977 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1978 if (tpr->pr_flags & PR_HOST) 1979 descend = 0; 1980 else { 1981 if (host != NULL) 1982 strlcpy(tpr->pr_hostname, 1983 pr->pr_hostname, 1984 sizeof(tpr->pr_hostname)); 1985 if (domain != NULL) 1986 strlcpy(tpr->pr_domainname, 1987 pr->pr_domainname, 1988 sizeof(tpr->pr_domainname)); 1989 if (uuid != NULL) 1990 strlcpy(tpr->pr_hostuuid, 1991 pr->pr_hostuuid, 1992 sizeof(tpr->pr_hostuuid)); 1993 if (gothid) 1994 tpr->pr_hostid = hid; 1995 } 1996 } 1997 } 1998 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1999 if ((tallow = ch_allow & ~pr_allow)) 2000 prison_set_allow_locked(pr, tallow, 0); 2001 /* 2002 * Persistent prisons get an extra reference, and prisons losing their 2003 * persist flag lose that reference. 2004 */ 2005 if (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags)) { 2006 if (pr_flags & PR_PERSIST) { 2007 prison_hold(pr); 2008 /* 2009 * This may be a new prison's first user reference, 2010 * but wait to call it alive until after OSD calls 2011 * have had a chance to run (and perhaps to fail). 2012 */ 2013 refcount_acquire(&pr->pr_uref); 2014 } else { 2015 drflags |= PD_DEUREF; 2016 prison_free_not_last(pr); 2017 } 2018 } 2019 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 2020 mtx_unlock(&pr->pr_mtx); 2021 drflags &= ~PD_LOCKED; 2022 /* 2023 * Any errors past this point will need to de-persist newly created 2024 * prisons, as well as call remove methods. 2025 */ 2026 if (created) 2027 drflags |= PD_KILL; 2028 2029 #ifdef RACCT 2030 if (racct_enable && created) 2031 prison_racct_attach(pr); 2032 #endif 2033 2034 /* Locks may have prevented a complete restriction of child IP 2035 * addresses. If so, allocate some more memory and try again. 2036 */ 2037 #ifdef INET 2038 while (redo_ip4) { 2039 ip4s = pr->pr_addrs[PR_INET]->ips; 2040 MPASS(ip4 == NULL); 2041 ip4 = prison_ip_alloc(PR_INET, ip4s, M_WAITOK); 2042 mtx_lock(&pr->pr_mtx); 2043 redo_ip4 = false; 2044 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 2045 #ifdef VIMAGE 2046 if (tpr->pr_flags & PR_VNET) { 2047 descend = 0; 2048 continue; 2049 } 2050 #endif 2051 if (!prison_ip_restrict(tpr, PR_INET, &ip4)) 2052 redo_ip4 = true; 2053 } 2054 mtx_unlock(&pr->pr_mtx); 2055 } 2056 #endif 2057 #ifdef INET6 2058 while (redo_ip6) { 2059 ip6s = pr->pr_addrs[PR_INET6]->ips; 2060 MPASS(ip6 == NULL); 2061 ip6 = prison_ip_alloc(PR_INET6, ip6s, M_WAITOK); 2062 mtx_lock(&pr->pr_mtx); 2063 redo_ip6 = false; 2064 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 2065 #ifdef VIMAGE 2066 if (tpr->pr_flags & PR_VNET) { 2067 descend = 0; 2068 continue; 2069 } 2070 #endif 2071 if (!prison_ip_restrict(tpr, PR_INET6, &ip6)) 2072 redo_ip6 = true; 2073 } 2074 mtx_unlock(&pr->pr_mtx); 2075 } 2076 #endif 2077 2078 /* Let the modules do their work. */ 2079 if (created) { 2080 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 2081 if (error) 2082 goto done_deref; 2083 } 2084 error = osd_jail_call(pr, PR_METHOD_SET, opts); 2085 if (error) 2086 goto done_deref; 2087 2088 /* 2089 * A new prison is now ready to be seen; either it has gained a user 2090 * reference via persistence, or is about to gain one via attachment. 2091 */ 2092 if (created) { 2093 drflags = prison_lock_xlock(pr, drflags); 2094 pr->pr_state = PRISON_STATE_ALIVE; 2095 } 2096 2097 /* Attach this process to the prison if requested. */ 2098 if (flags & JAIL_ATTACH) { 2099 error = do_jail_attach(td, pr, 2100 prison_lock_xlock(pr, drflags & PD_LOCK_FLAGS)); 2101 drflags &= ~(PD_LOCKED | PD_LIST_XLOCKED); 2102 if (error) { 2103 vfs_opterror(opts, "attach failed"); 2104 goto done_deref; 2105 } 2106 } 2107 2108 #ifdef RACCT 2109 if (racct_enable && !created) { 2110 if (drflags & PD_LOCKED) { 2111 mtx_unlock(&pr->pr_mtx); 2112 drflags &= ~PD_LOCKED; 2113 } 2114 if (drflags & PD_LIST_XLOCKED) { 2115 sx_xunlock(&allprison_lock); 2116 drflags &= ~PD_LIST_XLOCKED; 2117 } 2118 prison_racct_modify(pr); 2119 } 2120 #endif 2121 2122 if (created && pr != &prison0 && (pr->pr_allow & PR_ALLOW_NFSD) != 0 && 2123 (pr->pr_root->v_vflag & VV_ROOT) == 0) 2124 printf("Warning jail jid=%d: mountd/nfsd requires a separate" 2125 " file system\n", pr->pr_id); 2126 2127 drflags &= ~PD_KILL; 2128 td->td_retval[0] = pr->pr_id; 2129 2130 done_deref: 2131 /* Release any temporary prison holds and/or locks. */ 2132 if (pr != NULL) 2133 prison_deref(pr, drflags); 2134 else if (drflags & PD_LIST_SLOCKED) 2135 sx_sunlock(&allprison_lock); 2136 else if (drflags & PD_LIST_XLOCKED) 2137 sx_xunlock(&allprison_lock); 2138 if (root != NULL) 2139 vrele(root); 2140 done_errmsg: 2141 if (error) { 2142 /* Write the error message back to userspace. */ 2143 if (vfs_getopt(opts, "errmsg", (void **)&errmsg, 2144 &errmsg_len) == 0 && errmsg_len > 0) { 2145 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 2146 if (optuio->uio_segflg == UIO_SYSSPACE) 2147 bcopy(errmsg, 2148 optuio->uio_iov[errmsg_pos].iov_base, 2149 errmsg_len); 2150 else 2151 (void)copyout(errmsg, 2152 optuio->uio_iov[errmsg_pos].iov_base, 2153 errmsg_len); 2154 } 2155 } 2156 done_free: 2157 #ifdef INET 2158 prison_ip_free(ip4); 2159 #endif 2160 #ifdef INET6 2161 prison_ip_free(ip6); 2162 #endif 2163 if (g_path != NULL) 2164 free(g_path, M_TEMP); 2165 vfs_freeopts(opts); 2166 return (error); 2167 } 2168 2169 /* 2170 * Find the next available prison ID. Return the ID on success, or zero 2171 * on failure. Also set a pointer to the allprison list entry the prison 2172 * should be inserted before. 2173 */ 2174 static int 2175 get_next_prid(struct prison **insprp) 2176 { 2177 struct prison *inspr; 2178 int jid, maxid; 2179 2180 jid = lastprid % JAIL_MAX + 1; 2181 if (TAILQ_EMPTY(&allprison) || 2182 TAILQ_LAST(&allprison, prisonlist)->pr_id < jid) { 2183 /* 2184 * A common case is for all jails to be implicitly numbered, 2185 * which means they'll go on the end of the list, at least 2186 * for the first JAIL_MAX times. 2187 */ 2188 inspr = NULL; 2189 } else { 2190 /* 2191 * Take two passes through the allprison list: first starting 2192 * with the proposed jid, then ending with it. 2193 */ 2194 for (maxid = JAIL_MAX; maxid != 0; ) { 2195 TAILQ_FOREACH(inspr, &allprison, pr_list) { 2196 if (inspr->pr_id < jid) 2197 continue; 2198 if (inspr->pr_id > jid) { 2199 /* Found an opening. */ 2200 maxid = 0; 2201 break; 2202 } 2203 if (++jid > maxid) { 2204 if (lastprid == maxid || lastprid == 0) 2205 { 2206 /* 2207 * The entire legal range 2208 * has been traversed 2209 */ 2210 return 0; 2211 } 2212 /* Try again from the start. */ 2213 jid = 1; 2214 maxid = lastprid; 2215 break; 2216 } 2217 } 2218 if (inspr == NULL) { 2219 /* Found room at the end of the list. */ 2220 break; 2221 } 2222 } 2223 } 2224 *insprp = inspr; 2225 lastprid = jid; 2226 return (jid); 2227 } 2228 2229 /* 2230 * Find the next available ID for a renumbered dead prison. This is the same 2231 * as get_next_prid, but counting backward from the end of the range. 2232 */ 2233 static int 2234 get_next_deadid(struct prison **dinsprp) 2235 { 2236 struct prison *dinspr; 2237 int deadid, minid; 2238 2239 deadid = lastdeadid ? lastdeadid - 1 : JAIL_MAX; 2240 /* 2241 * Take two reverse passes through the allprison list: first 2242 * starting with the proposed deadid, then ending with it. 2243 */ 2244 for (minid = 1; minid != 0; ) { 2245 TAILQ_FOREACH_REVERSE(dinspr, &allprison, prisonlist, pr_list) { 2246 if (dinspr->pr_id > deadid) 2247 continue; 2248 if (dinspr->pr_id < deadid) { 2249 /* Found an opening. */ 2250 minid = 0; 2251 break; 2252 } 2253 if (--deadid < minid) { 2254 if (lastdeadid == minid || lastdeadid == 0) 2255 { 2256 /* 2257 * The entire legal range 2258 * has been traversed 2259 */ 2260 return 0; 2261 } 2262 /* Try again from the end. */ 2263 deadid = JAIL_MAX; 2264 minid = lastdeadid; 2265 break; 2266 } 2267 } 2268 if (dinspr == NULL) { 2269 /* Found room at the beginning of the list. */ 2270 break; 2271 } 2272 } 2273 *dinsprp = dinspr; 2274 lastdeadid = deadid; 2275 return (deadid); 2276 } 2277 2278 /* 2279 * struct jail_get_args { 2280 * struct iovec *iovp; 2281 * unsigned int iovcnt; 2282 * int flags; 2283 * }; 2284 */ 2285 int 2286 sys_jail_get(struct thread *td, struct jail_get_args *uap) 2287 { 2288 struct uio *auio; 2289 int error; 2290 2291 /* Check that we have an even number of iovecs. */ 2292 if (uap->iovcnt & 1) 2293 return (EINVAL); 2294 2295 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 2296 if (error) 2297 return (error); 2298 error = kern_jail_get(td, auio, uap->flags); 2299 if (error == 0) 2300 error = copyout(auio->uio_iov, uap->iovp, 2301 uap->iovcnt * sizeof(struct iovec)); 2302 freeuio(auio); 2303 return (error); 2304 } 2305 2306 int 2307 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 2308 { 2309 struct bool_flags *bf; 2310 struct jailsys_flags *jsf; 2311 struct prison *pr, *mypr; 2312 struct vfsopt *opt; 2313 struct vfsoptlist *opts; 2314 char *errmsg, *name; 2315 int drflags, error, errmsg_len, errmsg_pos, i, jid, len, pos; 2316 unsigned f; 2317 2318 if (flags & ~JAIL_GET_MASK) 2319 return (EINVAL); 2320 2321 /* Get the parameter list. */ 2322 error = vfs_buildopts(optuio, &opts); 2323 if (error) 2324 return (error); 2325 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 2326 mypr = td->td_ucred->cr_prison; 2327 pr = NULL; 2328 2329 /* 2330 * Find the prison specified by one of: lastjid, jid, name. 2331 */ 2332 sx_slock(&allprison_lock); 2333 drflags = PD_LIST_SLOCKED; 2334 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 2335 if (error == 0) { 2336 TAILQ_FOREACH(pr, &allprison, pr_list) { 2337 if (pr->pr_id > jid && 2338 ((flags & JAIL_DYING) || prison_isalive(pr)) && 2339 prison_ischild(mypr, pr)) { 2340 mtx_lock(&pr->pr_mtx); 2341 drflags |= PD_LOCKED; 2342 goto found_prison; 2343 } 2344 } 2345 error = ENOENT; 2346 vfs_opterror(opts, "no jail after %d", jid); 2347 goto done; 2348 } else if (error != ENOENT) 2349 goto done; 2350 2351 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 2352 if (error == 0) { 2353 if (jid != 0) { 2354 pr = prison_find_child(mypr, jid); 2355 if (pr != NULL) { 2356 drflags |= PD_LOCKED; 2357 if (!(prison_isalive(pr) || 2358 (flags & JAIL_DYING))) { 2359 error = ENOENT; 2360 vfs_opterror(opts, "jail %d is dying", 2361 jid); 2362 goto done; 2363 } 2364 goto found_prison; 2365 } 2366 error = ENOENT; 2367 vfs_opterror(opts, "jail %d not found", jid); 2368 goto done; 2369 } 2370 } else if (error != ENOENT) 2371 goto done; 2372 2373 error = vfs_getopt(opts, "name", (void **)&name, &len); 2374 if (error == 0) { 2375 if (len == 0 || name[len - 1] != '\0') { 2376 error = EINVAL; 2377 goto done; 2378 } 2379 pr = prison_find_name(mypr, name); 2380 if (pr != NULL) { 2381 drflags |= PD_LOCKED; 2382 if (!(prison_isalive(pr) || (flags & JAIL_DYING))) { 2383 error = ENOENT; 2384 vfs_opterror(opts, "jail \"%s\" is dying", 2385 name); 2386 goto done; 2387 } 2388 goto found_prison; 2389 } 2390 error = ENOENT; 2391 vfs_opterror(opts, "jail \"%s\" not found", name); 2392 goto done; 2393 } else if (error != ENOENT) 2394 goto done; 2395 2396 vfs_opterror(opts, "no jail specified"); 2397 error = ENOENT; 2398 goto done; 2399 2400 found_prison: 2401 /* Get the parameters of the prison. */ 2402 prison_hold(pr); 2403 drflags |= PD_DEREF; 2404 td->td_retval[0] = pr->pr_id; 2405 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2406 if (error != 0 && error != ENOENT) 2407 goto done; 2408 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2409 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2410 if (error != 0 && error != ENOENT) 2411 goto done; 2412 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2413 if (error != 0 && error != ENOENT) 2414 goto done; 2415 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2416 sizeof(pr->pr_cpuset->cs_id)); 2417 if (error != 0 && error != ENOENT) 2418 goto done; 2419 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2420 if (error != 0 && error != ENOENT) 2421 goto done; 2422 #ifdef INET 2423 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_addrs[PR_INET]->pr_ip, 2424 pr->pr_addrs[PR_INET] ? pr->pr_addrs[PR_INET]->ips * 2425 pr_families[PR_INET].size : 0 ); 2426 if (error != 0 && error != ENOENT) 2427 goto done; 2428 #endif 2429 #ifdef INET6 2430 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_addrs[PR_INET6]->pr_ip, 2431 pr->pr_addrs[PR_INET6] ? pr->pr_addrs[PR_INET6]->ips * 2432 pr_families[PR_INET6].size : 0 ); 2433 if (error != 0 && error != ENOENT) 2434 goto done; 2435 #endif 2436 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2437 sizeof(pr->pr_securelevel)); 2438 if (error != 0 && error != ENOENT) 2439 goto done; 2440 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2441 sizeof(pr->pr_childcount)); 2442 if (error != 0 && error != ENOENT) 2443 goto done; 2444 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2445 sizeof(pr->pr_childmax)); 2446 if (error != 0 && error != ENOENT) 2447 goto done; 2448 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2449 if (error != 0 && error != ENOENT) 2450 goto done; 2451 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2452 if (error != 0 && error != ENOENT) 2453 goto done; 2454 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2455 if (error != 0 && error != ENOENT) 2456 goto done; 2457 #ifdef COMPAT_FREEBSD32 2458 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2459 uint32_t hid32 = pr->pr_hostid; 2460 2461 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2462 } else 2463 #endif 2464 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2465 sizeof(pr->pr_hostid)); 2466 if (error != 0 && error != ENOENT) 2467 goto done; 2468 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2469 sizeof(pr->pr_enforce_statfs)); 2470 if (error != 0 && error != ENOENT) 2471 goto done; 2472 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2473 sizeof(pr->pr_devfs_rsnum)); 2474 if (error != 0 && error != ENOENT) 2475 goto done; 2476 for (bf = pr_flag_bool; 2477 bf < pr_flag_bool + nitems(pr_flag_bool); 2478 bf++) { 2479 i = (pr->pr_flags & bf->flag) ? 1 : 0; 2480 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2481 if (error != 0 && error != ENOENT) 2482 goto done; 2483 i = !i; 2484 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2485 if (error != 0 && error != ENOENT) 2486 goto done; 2487 } 2488 for (jsf = pr_flag_jailsys; 2489 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 2490 jsf++) { 2491 f = pr->pr_flags & (jsf->disable | jsf->new); 2492 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE 2493 : (f == jsf->new) ? JAIL_SYS_NEW 2494 : JAIL_SYS_INHERIT; 2495 error = vfs_setopt(opts, jsf->name, &i, sizeof(i)); 2496 if (error != 0 && error != ENOENT) 2497 goto done; 2498 } 2499 for (bf = pr_flag_allow; 2500 bf < pr_flag_allow + nitems(pr_flag_allow) && 2501 atomic_load_int(&bf->flag) != 0; 2502 bf++) { 2503 i = (pr->pr_allow & bf->flag) ? 1 : 0; 2504 error = vfs_setopt(opts, bf->name, &i, sizeof(i)); 2505 if (error != 0 && error != ENOENT) 2506 goto done; 2507 i = !i; 2508 error = vfs_setopt(opts, bf->noname, &i, sizeof(i)); 2509 if (error != 0 && error != ENOENT) 2510 goto done; 2511 } 2512 i = !prison_isalive(pr); 2513 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2514 if (error != 0 && error != ENOENT) 2515 goto done; 2516 i = !i; 2517 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2518 if (error != 0 && error != ENOENT) 2519 goto done; 2520 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2521 sizeof(pr->pr_osreldate)); 2522 if (error != 0 && error != ENOENT) 2523 goto done; 2524 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2525 if (error != 0 && error != ENOENT) 2526 goto done; 2527 2528 /* Get the module parameters. */ 2529 mtx_unlock(&pr->pr_mtx); 2530 drflags &= ~PD_LOCKED; 2531 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2532 if (error) 2533 goto done; 2534 prison_deref(pr, drflags); 2535 pr = NULL; 2536 drflags = 0; 2537 2538 /* By now, all parameters should have been noted. */ 2539 TAILQ_FOREACH(opt, opts, link) { 2540 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2541 error = EINVAL; 2542 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2543 goto done; 2544 } 2545 } 2546 2547 /* Write the fetched parameters back to userspace. */ 2548 error = 0; 2549 TAILQ_FOREACH(opt, opts, link) { 2550 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2551 pos = 2 * opt->pos + 1; 2552 optuio->uio_iov[pos].iov_len = opt->len; 2553 if (opt->value != NULL) { 2554 if (optuio->uio_segflg == UIO_SYSSPACE) { 2555 bcopy(opt->value, 2556 optuio->uio_iov[pos].iov_base, 2557 opt->len); 2558 } else { 2559 error = copyout(opt->value, 2560 optuio->uio_iov[pos].iov_base, 2561 opt->len); 2562 if (error) 2563 break; 2564 } 2565 } 2566 } 2567 } 2568 2569 done: 2570 /* Release any temporary prison holds and/or locks. */ 2571 if (pr != NULL) 2572 prison_deref(pr, drflags); 2573 else if (drflags & PD_LIST_SLOCKED) 2574 sx_sunlock(&allprison_lock); 2575 if (error && errmsg_pos >= 0) { 2576 /* Write the error message back to userspace. */ 2577 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2578 errmsg_pos = 2 * errmsg_pos + 1; 2579 if (errmsg_len > 0) { 2580 if (optuio->uio_segflg == UIO_SYSSPACE) 2581 bcopy(errmsg, 2582 optuio->uio_iov[errmsg_pos].iov_base, 2583 errmsg_len); 2584 else 2585 (void)copyout(errmsg, 2586 optuio->uio_iov[errmsg_pos].iov_base, 2587 errmsg_len); 2588 } 2589 } 2590 vfs_freeopts(opts); 2591 return (error); 2592 } 2593 2594 /* 2595 * struct jail_remove_args { 2596 * int jid; 2597 * }; 2598 */ 2599 int 2600 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2601 { 2602 struct prison *pr; 2603 int error; 2604 2605 error = priv_check(td, PRIV_JAIL_REMOVE); 2606 if (error) 2607 return (error); 2608 2609 sx_xlock(&allprison_lock); 2610 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2611 if (pr == NULL) { 2612 sx_xunlock(&allprison_lock); 2613 return (EINVAL); 2614 } 2615 if (!prison_isalive(pr)) { 2616 /* Silently ignore already-dying prisons. */ 2617 mtx_unlock(&pr->pr_mtx); 2618 sx_xunlock(&allprison_lock); 2619 return (0); 2620 } 2621 prison_deref(pr, PD_KILL | PD_LOCKED | PD_LIST_XLOCKED); 2622 return (0); 2623 } 2624 2625 /* 2626 * struct jail_attach_args { 2627 * int jid; 2628 * }; 2629 */ 2630 int 2631 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2632 { 2633 struct prison *pr; 2634 int error; 2635 2636 error = priv_check(td, PRIV_JAIL_ATTACH); 2637 if (error) 2638 return (error); 2639 2640 sx_slock(&allprison_lock); 2641 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2642 if (pr == NULL) { 2643 sx_sunlock(&allprison_lock); 2644 return (EINVAL); 2645 } 2646 2647 /* Do not allow a process to attach to a prison that is not alive. */ 2648 if (!prison_isalive(pr)) { 2649 mtx_unlock(&pr->pr_mtx); 2650 sx_sunlock(&allprison_lock); 2651 return (EINVAL); 2652 } 2653 2654 return (do_jail_attach(td, pr, PD_LOCKED | PD_LIST_SLOCKED)); 2655 } 2656 2657 static int 2658 do_jail_attach(struct thread *td, struct prison *pr, int drflags) 2659 { 2660 struct proc *p; 2661 struct ucred *newcred, *oldcred; 2662 int error; 2663 2664 mtx_assert(&pr->pr_mtx, MA_OWNED); 2665 sx_assert(&allprison_lock, SX_LOCKED); 2666 drflags &= PD_LOCK_FLAGS; 2667 /* 2668 * XXX: Note that there is a slight race here if two threads 2669 * in the same privileged process attempt to attach to two 2670 * different jails at the same time. It is important for 2671 * user processes not to do this, or they might end up with 2672 * a process root from one prison, but attached to the jail 2673 * of another. 2674 */ 2675 prison_hold(pr); 2676 refcount_acquire(&pr->pr_uref); 2677 drflags |= PD_DEREF | PD_DEUREF; 2678 mtx_unlock(&pr->pr_mtx); 2679 drflags &= ~PD_LOCKED; 2680 2681 /* Let modules do whatever they need to prepare for attaching. */ 2682 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2683 if (error) { 2684 prison_deref(pr, drflags); 2685 return (error); 2686 } 2687 sx_unlock(&allprison_lock); 2688 drflags &= ~(PD_LIST_SLOCKED | PD_LIST_XLOCKED); 2689 2690 /* 2691 * Reparent the newly attached process to this jail. 2692 */ 2693 p = td->td_proc; 2694 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2695 if (error) 2696 goto e_revert_osd; 2697 2698 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2699 if ((error = change_dir(pr->pr_root, td)) != 0) 2700 goto e_unlock; 2701 #ifdef MAC 2702 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2703 goto e_unlock; 2704 #endif 2705 VOP_UNLOCK(pr->pr_root); 2706 if ((error = pwd_chroot_chdir(td, pr->pr_root))) 2707 goto e_revert_osd; 2708 2709 newcred = crget(); 2710 PROC_LOCK(p); 2711 oldcred = crcopysafe(p, newcred); 2712 newcred->cr_prison = pr; 2713 proc_set_cred(p, newcred); 2714 setsugid(p); 2715 #ifdef RACCT 2716 racct_proc_ucred_changed(p, oldcred, newcred); 2717 crhold(newcred); 2718 #endif 2719 PROC_UNLOCK(p); 2720 #ifdef RCTL 2721 rctl_proc_ucred_changed(p, newcred); 2722 crfree(newcred); 2723 #endif 2724 prison_proc_relink(oldcred->cr_prison, pr, p); 2725 prison_deref(oldcred->cr_prison, drflags); 2726 crfree(oldcred); 2727 2728 /* 2729 * If the prison was killed while changing credentials, die along 2730 * with it. 2731 */ 2732 if (!prison_isalive(pr)) { 2733 PROC_LOCK(p); 2734 kern_psignal(p, SIGKILL); 2735 PROC_UNLOCK(p); 2736 } 2737 2738 return (0); 2739 2740 e_unlock: 2741 VOP_UNLOCK(pr->pr_root); 2742 e_revert_osd: 2743 /* Tell modules this thread is still in its old jail after all. */ 2744 sx_slock(&allprison_lock); 2745 drflags |= PD_LIST_SLOCKED; 2746 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2747 prison_deref(pr, drflags); 2748 return (error); 2749 } 2750 2751 /* 2752 * Returns a locked prison instance, or NULL on failure. 2753 */ 2754 struct prison * 2755 prison_find(int prid) 2756 { 2757 struct prison *pr; 2758 2759 sx_assert(&allprison_lock, SX_LOCKED); 2760 TAILQ_FOREACH(pr, &allprison, pr_list) { 2761 if (pr->pr_id < prid) 2762 continue; 2763 if (pr->pr_id > prid) 2764 break; 2765 KASSERT(prison_isvalid(pr), ("Found invalid prison %p", pr)); 2766 mtx_lock(&pr->pr_mtx); 2767 return (pr); 2768 } 2769 return (NULL); 2770 } 2771 2772 /* 2773 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2774 */ 2775 struct prison * 2776 prison_find_child(struct prison *mypr, int prid) 2777 { 2778 struct prison *pr; 2779 int descend; 2780 2781 sx_assert(&allprison_lock, SX_LOCKED); 2782 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2783 if (pr->pr_id == prid) { 2784 KASSERT(prison_isvalid(pr), 2785 ("Found invalid prison %p", pr)); 2786 mtx_lock(&pr->pr_mtx); 2787 return (pr); 2788 } 2789 } 2790 return (NULL); 2791 } 2792 2793 /* 2794 * Look for the name relative to mypr. Returns a locked prison or NULL. 2795 */ 2796 struct prison * 2797 prison_find_name(struct prison *mypr, const char *name) 2798 { 2799 struct prison *pr, *deadpr; 2800 size_t mylen; 2801 int descend; 2802 2803 sx_assert(&allprison_lock, SX_LOCKED); 2804 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2805 deadpr = NULL; 2806 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2807 if (!strcmp(pr->pr_name + mylen, name)) { 2808 KASSERT(prison_isvalid(pr), 2809 ("Found invalid prison %p", pr)); 2810 if (prison_isalive(pr)) { 2811 mtx_lock(&pr->pr_mtx); 2812 return (pr); 2813 } 2814 deadpr = pr; 2815 } 2816 } 2817 /* There was no valid prison - perhaps there was a dying one. */ 2818 if (deadpr != NULL) 2819 mtx_lock(&deadpr->pr_mtx); 2820 return (deadpr); 2821 } 2822 2823 /* 2824 * See if a prison has the specific flag set. The prison should be locked, 2825 * unless checking for flags that are only set at jail creation (such as 2826 * PR_IP4 and PR_IP6), or only the single bit is examined, without regard 2827 * to any other prison data. 2828 */ 2829 bool 2830 prison_flag(struct ucred *cred, unsigned flag) 2831 { 2832 2833 return ((cred->cr_prison->pr_flags & flag) != 0); 2834 } 2835 2836 /* 2837 * See if a prison has the specific allow flag set. 2838 * The prison *should* be locked, or only a single bit is examined, without 2839 * regard to any other prison data. 2840 */ 2841 bool 2842 prison_allow(struct ucred *cred, unsigned flag) 2843 { 2844 2845 return ((cred->cr_prison->pr_allow & flag) != 0); 2846 } 2847 2848 /* 2849 * Hold a prison reference, by incrementing pr_ref. It is generally 2850 * an error to hold a prison that does not already have a reference. 2851 * A prison record will remain valid as long as it has at least one 2852 * reference, and will not be removed as long as either the prison 2853 * mutex or the allprison lock is held (allprison_lock may be shared). 2854 */ 2855 void 2856 prison_hold_locked(struct prison *pr) 2857 { 2858 2859 /* Locking is no longer required. */ 2860 prison_hold(pr); 2861 } 2862 2863 void 2864 prison_hold(struct prison *pr) 2865 { 2866 #ifdef INVARIANTS 2867 int was_valid = refcount_acquire_if_not_zero(&pr->pr_ref); 2868 2869 KASSERT(was_valid, 2870 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id)); 2871 #else 2872 refcount_acquire(&pr->pr_ref); 2873 #endif 2874 } 2875 2876 /* 2877 * Remove a prison reference. If that was the last reference, the 2878 * prison will be removed (at a later time). 2879 */ 2880 void 2881 prison_free_locked(struct prison *pr) 2882 { 2883 2884 mtx_assert(&pr->pr_mtx, MA_OWNED); 2885 /* 2886 * Locking is no longer required, but unlock because the caller 2887 * expects it. 2888 */ 2889 mtx_unlock(&pr->pr_mtx); 2890 prison_free(pr); 2891 } 2892 2893 void 2894 prison_free(struct prison *pr) 2895 { 2896 2897 KASSERT(refcount_load(&pr->pr_ref) > 0, 2898 ("Trying to free dead prison %p (jid=%d).", 2899 pr, pr->pr_id)); 2900 if (!refcount_release_if_not_last(&pr->pr_ref)) { 2901 /* 2902 * Don't remove the last reference in this context, 2903 * in case there are locks held. 2904 */ 2905 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2906 } 2907 } 2908 2909 static void 2910 prison_free_not_last(struct prison *pr) 2911 { 2912 #ifdef INVARIANTS 2913 int lastref; 2914 2915 KASSERT(refcount_load(&pr->pr_ref) > 0, 2916 ("Trying to free dead prison %p (jid=%d).", 2917 pr, pr->pr_id)); 2918 lastref = refcount_release(&pr->pr_ref); 2919 KASSERT(!lastref, 2920 ("prison_free_not_last freed last ref on prison %p (jid=%d).", 2921 pr, pr->pr_id)); 2922 #else 2923 refcount_release(&pr->pr_ref); 2924 #endif 2925 } 2926 2927 /* 2928 * Hold a prison for user visibility, by incrementing pr_uref. 2929 * It is generally an error to hold a prison that isn't already 2930 * user-visible, except through the jail system calls. It is also 2931 * an error to hold an invalid prison. A prison record will remain 2932 * alive as long as it has at least one user reference, and will not 2933 * be set to the dying state until the prison mutex and allprison_lock 2934 * are both freed. 2935 */ 2936 void 2937 prison_proc_hold(struct prison *pr) 2938 { 2939 #ifdef INVARIANTS 2940 int was_alive = refcount_acquire_if_not_zero(&pr->pr_uref); 2941 2942 KASSERT(was_alive, 2943 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2944 #else 2945 refcount_acquire(&pr->pr_uref); 2946 #endif 2947 } 2948 2949 /* 2950 * Remove a prison user reference. If it was the last reference, the 2951 * prison will be considered "dying", and may be removed once all of 2952 * its references are dropped. 2953 */ 2954 void 2955 prison_proc_free(struct prison *pr) 2956 { 2957 2958 /* 2959 * Locking is only required when releasing the last reference. 2960 * This allows assurance that a locked prison will remain alive 2961 * until it is unlocked. 2962 */ 2963 KASSERT(refcount_load(&pr->pr_uref) > 0, 2964 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2965 if (!refcount_release_if_not_last(&pr->pr_uref)) { 2966 /* 2967 * Don't remove the last user reference in this context, 2968 * which is expected to be a process that is not only locked, 2969 * but also half dead. Add a reference so any calls to 2970 * prison_free() won't re-submit the task. 2971 */ 2972 prison_hold(pr); 2973 mtx_lock(&pr->pr_mtx); 2974 KASSERT(!(pr->pr_flags & PR_COMPLETE_PROC), 2975 ("Redundant last reference in prison_proc_free (jid=%d)", 2976 pr->pr_id)); 2977 pr->pr_flags |= PR_COMPLETE_PROC; 2978 mtx_unlock(&pr->pr_mtx); 2979 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2980 } 2981 } 2982 2983 static void 2984 prison_proc_free_not_last(struct prison *pr) 2985 { 2986 #ifdef INVARIANTS 2987 int lastref; 2988 2989 KASSERT(refcount_load(&pr->pr_uref) > 0, 2990 ("Trying to free dead prison %p (jid=%d).", 2991 pr, pr->pr_id)); 2992 lastref = refcount_release(&pr->pr_uref); 2993 KASSERT(!lastref, 2994 ("prison_proc_free_not_last freed last uref on prison %p (jid=%d).", 2995 pr, pr->pr_id)); 2996 #else 2997 refcount_release(&pr->pr_uref); 2998 #endif 2999 } 3000 3001 void 3002 prison_proc_link(struct prison *pr, struct proc *p) 3003 { 3004 3005 sx_assert(&allproc_lock, SA_XLOCKED); 3006 LIST_INSERT_HEAD(&pr->pr_proclist, p, p_jaillist); 3007 } 3008 3009 void 3010 prison_proc_unlink(struct prison *pr, struct proc *p) 3011 { 3012 3013 sx_assert(&allproc_lock, SA_XLOCKED); 3014 LIST_REMOVE(p, p_jaillist); 3015 } 3016 3017 static void 3018 prison_proc_relink(struct prison *opr, struct prison *npr, struct proc *p) 3019 { 3020 3021 sx_xlock(&allproc_lock); 3022 prison_proc_unlink(opr, p); 3023 prison_proc_link(npr, p); 3024 sx_xunlock(&allproc_lock); 3025 } 3026 3027 /* 3028 * Complete a call to either prison_free or prison_proc_free. 3029 */ 3030 static void 3031 prison_complete(void *context, int pending) 3032 { 3033 struct prison *pr = context; 3034 int drflags; 3035 3036 /* 3037 * This could be called to release the last reference, or the last 3038 * user reference (plus the reference held in prison_proc_free). 3039 */ 3040 drflags = prison_lock_xlock(pr, PD_DEREF); 3041 if (pr->pr_flags & PR_COMPLETE_PROC) { 3042 pr->pr_flags &= ~PR_COMPLETE_PROC; 3043 drflags |= PD_DEUREF; 3044 } 3045 prison_deref(pr, drflags); 3046 } 3047 3048 static void 3049 prison_kill_processes_cb(struct proc *p, void *arg __unused) 3050 { 3051 3052 kern_psignal(p, SIGKILL); 3053 } 3054 3055 /* 3056 * Note the iteration does not guarantee acting on all processes. 3057 * Most notably there may be fork or jail_attach in progress. 3058 */ 3059 void 3060 prison_proc_iterate(struct prison *pr, void (*cb)(struct proc *, void *), 3061 void *cbarg) 3062 { 3063 struct prison *ppr; 3064 struct proc *p; 3065 3066 if (atomic_load_int(&pr->pr_childcount) == 0) { 3067 sx_slock(&allproc_lock); 3068 LIST_FOREACH(p, &pr->pr_proclist, p_jaillist) { 3069 if (p->p_state == PRS_NEW) 3070 continue; 3071 PROC_LOCK(p); 3072 cb(p, cbarg); 3073 PROC_UNLOCK(p); 3074 } 3075 sx_sunlock(&allproc_lock); 3076 if (atomic_load_int(&pr->pr_childcount) == 0) 3077 return; 3078 /* 3079 * Some jails popped up during the iteration, fall through to a 3080 * system-wide search. 3081 */ 3082 } 3083 3084 sx_slock(&allproc_lock); 3085 FOREACH_PROC_IN_SYSTEM(p) { 3086 PROC_LOCK(p); 3087 if (p->p_state != PRS_NEW && p->p_ucred != NULL) { 3088 for (ppr = p->p_ucred->cr_prison; 3089 ppr != &prison0; 3090 ppr = ppr->pr_parent) { 3091 if (ppr == pr) { 3092 cb(p, cbarg); 3093 break; 3094 } 3095 } 3096 } 3097 PROC_UNLOCK(p); 3098 } 3099 sx_sunlock(&allproc_lock); 3100 } 3101 3102 /* 3103 * Remove a prison reference and/or user reference (usually). 3104 * This assumes context that allows sleeping (for allprison_lock), 3105 * with no non-sleeping locks held, except perhaps the prison itself. 3106 * If there are no more references, release and delist the prison. 3107 * On completion, the prison lock and the allprison lock are both 3108 * unlocked. 3109 */ 3110 static void 3111 prison_deref(struct prison *pr, int flags) 3112 { 3113 struct prisonlist freeprison; 3114 struct prison *killpr, *rpr, *ppr, *tpr; 3115 3116 killpr = NULL; 3117 TAILQ_INIT(&freeprison); 3118 /* 3119 * Release this prison as requested, which may cause its parent 3120 * to be released, and then maybe its grandparent, etc. 3121 */ 3122 for (;;) { 3123 if (flags & PD_KILL) { 3124 /* Kill the prison and its descendents. */ 3125 KASSERT(pr != &prison0, 3126 ("prison_deref trying to kill prison0")); 3127 if (!(flags & PD_DEREF)) { 3128 prison_hold(pr); 3129 flags |= PD_DEREF; 3130 } 3131 flags = prison_lock_xlock(pr, flags); 3132 prison_deref_kill(pr, &freeprison); 3133 } 3134 if (flags & PD_DEUREF) { 3135 /* Drop a user reference. */ 3136 KASSERT(refcount_load(&pr->pr_uref) > 0, 3137 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 3138 pr->pr_id)); 3139 if (!refcount_release_if_not_last(&pr->pr_uref)) { 3140 if (!(flags & PD_DEREF)) { 3141 prison_hold(pr); 3142 flags |= PD_DEREF; 3143 } 3144 flags = prison_lock_xlock(pr, flags); 3145 if (refcount_release(&pr->pr_uref) && 3146 pr->pr_state == PRISON_STATE_ALIVE) { 3147 /* 3148 * When the last user references goes, 3149 * this becomes a dying prison. 3150 */ 3151 KASSERT( 3152 refcount_load(&prison0.pr_uref) > 0, 3153 ("prison0 pr_uref=0")); 3154 pr->pr_state = PRISON_STATE_DYING; 3155 mtx_unlock(&pr->pr_mtx); 3156 flags &= ~PD_LOCKED; 3157 prison_cleanup(pr); 3158 } 3159 } 3160 } 3161 if (flags & PD_KILL) { 3162 /* 3163 * Any remaining user references are probably processes 3164 * that need to be killed, either in this prison or its 3165 * descendants. 3166 */ 3167 if (refcount_load(&pr->pr_uref) > 0) 3168 killpr = pr; 3169 /* Make sure the parent prison doesn't get killed. */ 3170 flags &= ~PD_KILL; 3171 } 3172 if (flags & PD_DEREF) { 3173 /* Drop a reference. */ 3174 KASSERT(refcount_load(&pr->pr_ref) > 0, 3175 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 3176 pr->pr_id)); 3177 if (!refcount_release_if_not_last(&pr->pr_ref)) { 3178 flags = prison_lock_xlock(pr, flags); 3179 if (refcount_release(&pr->pr_ref)) { 3180 /* 3181 * When the last reference goes, 3182 * unlink the prison and set it aside. 3183 */ 3184 KASSERT( 3185 refcount_load(&pr->pr_uref) == 0, 3186 ("prison_deref: last ref, " 3187 "but still has %d urefs (jid=%d)", 3188 pr->pr_uref, pr->pr_id)); 3189 KASSERT( 3190 refcount_load(&prison0.pr_ref) != 0, 3191 ("prison0 pr_ref=0")); 3192 pr->pr_state = PRISON_STATE_INVALID; 3193 TAILQ_REMOVE(&allprison, pr, pr_list); 3194 LIST_REMOVE(pr, pr_sibling); 3195 TAILQ_INSERT_TAIL(&freeprison, pr, 3196 pr_list); 3197 for (ppr = pr->pr_parent; 3198 ppr != NULL; 3199 ppr = ppr->pr_parent) 3200 ppr->pr_childcount--; 3201 /* 3202 * Removing a prison frees references 3203 * from its parent. 3204 */ 3205 mtx_unlock(&pr->pr_mtx); 3206 flags &= ~PD_LOCKED; 3207 pr = pr->pr_parent; 3208 flags |= PD_DEREF | PD_DEUREF; 3209 continue; 3210 } 3211 } 3212 } 3213 break; 3214 } 3215 3216 /* Release all the prison locks. */ 3217 if (flags & PD_LOCKED) 3218 mtx_unlock(&pr->pr_mtx); 3219 if (flags & PD_LIST_SLOCKED) 3220 sx_sunlock(&allprison_lock); 3221 else if (flags & PD_LIST_XLOCKED) 3222 sx_xunlock(&allprison_lock); 3223 3224 /* Kill any processes attached to a killed prison. */ 3225 if (killpr != NULL) 3226 prison_proc_iterate(killpr, prison_kill_processes_cb, NULL); 3227 3228 /* 3229 * Finish removing any unreferenced prisons, which couldn't happen 3230 * while allprison_lock was held (to avoid a LOR on vrele). 3231 */ 3232 TAILQ_FOREACH_SAFE(rpr, &freeprison, pr_list, tpr) { 3233 #ifdef VIMAGE 3234 if (rpr->pr_vnet != rpr->pr_parent->pr_vnet) 3235 vnet_destroy(rpr->pr_vnet); 3236 #endif 3237 if (rpr->pr_root != NULL) 3238 vrele(rpr->pr_root); 3239 mtx_destroy(&rpr->pr_mtx); 3240 #ifdef INET 3241 prison_ip_free(rpr->pr_addrs[PR_INET]); 3242 #endif 3243 #ifdef INET6 3244 prison_ip_free(rpr->pr_addrs[PR_INET6]); 3245 #endif 3246 if (rpr->pr_cpuset != NULL) 3247 cpuset_rel(rpr->pr_cpuset); 3248 osd_jail_exit(rpr); 3249 #ifdef RACCT 3250 if (racct_enable) 3251 prison_racct_detach(rpr); 3252 #endif 3253 TAILQ_REMOVE(&freeprison, rpr, pr_list); 3254 free(rpr, M_PRISON); 3255 } 3256 } 3257 3258 /* 3259 * Kill the prison and its descendants. Mark them as dying, clear the 3260 * persist flag, and call module remove methods. 3261 */ 3262 static void 3263 prison_deref_kill(struct prison *pr, struct prisonlist *freeprison) 3264 { 3265 struct prison *cpr, *ppr, *rpr; 3266 bool descend; 3267 3268 /* 3269 * Unlike the descendants, the target prison can be killed 3270 * even if it is currently dying. This is useful for failed 3271 * creation in jail_set(2). 3272 */ 3273 KASSERT(refcount_load(&pr->pr_ref) > 0, 3274 ("Trying to kill dead prison %p (jid=%d).", 3275 pr, pr->pr_id)); 3276 refcount_acquire(&pr->pr_uref); 3277 pr->pr_state = PRISON_STATE_DYING; 3278 mtx_unlock(&pr->pr_mtx); 3279 3280 rpr = NULL; 3281 FOREACH_PRISON_DESCENDANT_PRE_POST(pr, cpr, descend) { 3282 if (descend) { 3283 if (!prison_isalive(cpr)) { 3284 descend = false; 3285 continue; 3286 } 3287 prison_hold(cpr); 3288 prison_proc_hold(cpr); 3289 mtx_lock(&cpr->pr_mtx); 3290 cpr->pr_state = PRISON_STATE_DYING; 3291 cpr->pr_flags |= PR_REMOVE; 3292 mtx_unlock(&cpr->pr_mtx); 3293 continue; 3294 } 3295 if (!(cpr->pr_flags & PR_REMOVE)) 3296 continue; 3297 prison_cleanup(cpr); 3298 mtx_lock(&cpr->pr_mtx); 3299 cpr->pr_flags &= ~PR_REMOVE; 3300 if (cpr->pr_flags & PR_PERSIST) { 3301 cpr->pr_flags &= ~PR_PERSIST; 3302 prison_proc_free_not_last(cpr); 3303 prison_free_not_last(cpr); 3304 } 3305 (void)refcount_release(&cpr->pr_uref); 3306 if (refcount_release(&cpr->pr_ref)) { 3307 /* 3308 * When the last reference goes, unlink the prison 3309 * and set it aside for prison_deref() to handle. 3310 * Delay unlinking the sibling list to keep the loop 3311 * safe. 3312 */ 3313 if (rpr != NULL) 3314 LIST_REMOVE(rpr, pr_sibling); 3315 rpr = cpr; 3316 rpr->pr_state = PRISON_STATE_INVALID; 3317 TAILQ_REMOVE(&allprison, rpr, pr_list); 3318 TAILQ_INSERT_TAIL(freeprison, rpr, pr_list); 3319 /* 3320 * Removing a prison frees references from its parent. 3321 */ 3322 ppr = rpr->pr_parent; 3323 prison_proc_free_not_last(ppr); 3324 prison_free_not_last(ppr); 3325 for (; ppr != NULL; ppr = ppr->pr_parent) 3326 ppr->pr_childcount--; 3327 } 3328 mtx_unlock(&cpr->pr_mtx); 3329 } 3330 if (rpr != NULL) 3331 LIST_REMOVE(rpr, pr_sibling); 3332 3333 prison_cleanup(pr); 3334 mtx_lock(&pr->pr_mtx); 3335 if (pr->pr_flags & PR_PERSIST) { 3336 pr->pr_flags &= ~PR_PERSIST; 3337 prison_proc_free_not_last(pr); 3338 prison_free_not_last(pr); 3339 } 3340 (void)refcount_release(&pr->pr_uref); 3341 } 3342 3343 /* 3344 * Given the current locking state in the flags, make sure allprison_lock 3345 * is held exclusive, and the prison is locked. Return flags indicating 3346 * the new state. 3347 */ 3348 static int 3349 prison_lock_xlock(struct prison *pr, int flags) 3350 { 3351 3352 if (!(flags & PD_LIST_XLOCKED)) { 3353 /* 3354 * Get allprison_lock, which may be an upgrade, 3355 * and may require unlocking the prison. 3356 */ 3357 if (flags & PD_LOCKED) { 3358 mtx_unlock(&pr->pr_mtx); 3359 flags &= ~PD_LOCKED; 3360 } 3361 if (flags & PD_LIST_SLOCKED) { 3362 if (!sx_try_upgrade(&allprison_lock)) { 3363 sx_sunlock(&allprison_lock); 3364 sx_xlock(&allprison_lock); 3365 } 3366 flags &= ~PD_LIST_SLOCKED; 3367 } else 3368 sx_xlock(&allprison_lock); 3369 flags |= PD_LIST_XLOCKED; 3370 } 3371 if (!(flags & PD_LOCKED)) { 3372 /* Lock the prison mutex. */ 3373 mtx_lock(&pr->pr_mtx); 3374 flags |= PD_LOCKED; 3375 } 3376 return flags; 3377 } 3378 3379 /* 3380 * Release a prison's resources when it starts dying (when the last user 3381 * reference is dropped, or when it is killed). 3382 */ 3383 static void 3384 prison_cleanup(struct prison *pr) 3385 { 3386 sx_assert(&allprison_lock, SA_XLOCKED); 3387 mtx_assert(&pr->pr_mtx, MA_NOTOWNED); 3388 vfs_exjail_delete(pr); 3389 shm_remove_prison(pr); 3390 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 3391 } 3392 3393 /* 3394 * Set or clear a permission bit in the pr_allow field, passing restrictions 3395 * (cleared permission) down to child jails. 3396 */ 3397 void 3398 prison_set_allow(struct ucred *cred, unsigned flag, int enable) 3399 { 3400 struct prison *pr; 3401 3402 pr = cred->cr_prison; 3403 sx_slock(&allprison_lock); 3404 mtx_lock(&pr->pr_mtx); 3405 prison_set_allow_locked(pr, flag, enable); 3406 mtx_unlock(&pr->pr_mtx); 3407 sx_sunlock(&allprison_lock); 3408 } 3409 3410 static void 3411 prison_set_allow_locked(struct prison *pr, unsigned flag, int enable) 3412 { 3413 struct prison *cpr; 3414 int descend; 3415 3416 if (enable != 0) 3417 pr->pr_allow |= flag; 3418 else { 3419 pr->pr_allow &= ~flag; 3420 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 3421 cpr->pr_allow &= ~flag; 3422 } 3423 } 3424 3425 /* 3426 * Check if a jail supports the given address family. 3427 * 3428 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3429 * if not. 3430 */ 3431 int 3432 prison_check_af(struct ucred *cred, int af) 3433 { 3434 struct prison *pr; 3435 int error; 3436 3437 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3438 3439 pr = cred->cr_prison; 3440 #ifdef VIMAGE 3441 /* Prisons with their own network stack are not limited. */ 3442 if (prison_owns_vnet(cred)) 3443 return (0); 3444 #endif 3445 3446 error = 0; 3447 switch (af) 3448 { 3449 #ifdef INET 3450 case AF_INET: 3451 if (pr->pr_flags & PR_IP4) 3452 { 3453 mtx_lock(&pr->pr_mtx); 3454 if ((pr->pr_flags & PR_IP4) && 3455 pr->pr_addrs[PR_INET] == NULL) 3456 error = EAFNOSUPPORT; 3457 mtx_unlock(&pr->pr_mtx); 3458 } 3459 break; 3460 #endif 3461 #ifdef INET6 3462 case AF_INET6: 3463 if (pr->pr_flags & PR_IP6) 3464 { 3465 mtx_lock(&pr->pr_mtx); 3466 if ((pr->pr_flags & PR_IP6) && 3467 pr->pr_addrs[PR_INET6] == NULL) 3468 error = EAFNOSUPPORT; 3469 mtx_unlock(&pr->pr_mtx); 3470 } 3471 break; 3472 #endif 3473 case AF_LOCAL: 3474 case AF_ROUTE: 3475 case AF_NETLINK: 3476 break; 3477 default: 3478 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3479 error = EAFNOSUPPORT; 3480 } 3481 return (error); 3482 } 3483 3484 /* 3485 * Check if given address belongs to the jail referenced by cred (wrapper to 3486 * prison_check_ip[46]). 3487 * 3488 * Returns 0 if jail doesn't restrict the address family or if address belongs 3489 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3490 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3491 */ 3492 int 3493 prison_if(struct ucred *cred, const struct sockaddr *sa) 3494 { 3495 #ifdef INET 3496 const struct sockaddr_in *sai; 3497 #endif 3498 #ifdef INET6 3499 const struct sockaddr_in6 *sai6; 3500 #endif 3501 int error; 3502 3503 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3504 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3505 3506 #ifdef VIMAGE 3507 if (prison_owns_vnet(cred)) 3508 return (0); 3509 #endif 3510 3511 error = 0; 3512 switch (sa->sa_family) 3513 { 3514 #ifdef INET 3515 case AF_INET: 3516 sai = (const struct sockaddr_in *)sa; 3517 error = prison_check_ip4(cred, &sai->sin_addr); 3518 break; 3519 #endif 3520 #ifdef INET6 3521 case AF_INET6: 3522 sai6 = (const struct sockaddr_in6 *)sa; 3523 error = prison_check_ip6(cred, &sai6->sin6_addr); 3524 break; 3525 #endif 3526 default: 3527 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3528 error = EAFNOSUPPORT; 3529 } 3530 return (error); 3531 } 3532 3533 /* 3534 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3535 */ 3536 int 3537 prison_check(struct ucred *cred1, struct ucred *cred2) 3538 { 3539 3540 return ((cred1->cr_prison == cred2->cr_prison || 3541 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3542 } 3543 3544 /* 3545 * For mountd/nfsd to run within a prison, it must be: 3546 * - A vnet prison. 3547 * - PR_ALLOW_NFSD must be set on it. 3548 * - The root directory (pr_root) of the prison must be 3549 * a file system mount point, so the mountd can hang 3550 * export information on it. 3551 * - The prison's enforce_statfs cannot be 0, so that 3552 * mountd(8) can do exports. 3553 */ 3554 bool 3555 prison_check_nfsd(struct ucred *cred) 3556 { 3557 3558 if (jailed_without_vnet(cred)) 3559 return (false); 3560 if (!prison_allow(cred, PR_ALLOW_NFSD)) 3561 return (false); 3562 if ((cred->cr_prison->pr_root->v_vflag & VV_ROOT) == 0) 3563 return (false); 3564 if (cred->cr_prison->pr_enforce_statfs == 0) 3565 return (false); 3566 return (true); 3567 } 3568 3569 /* 3570 * Return true if p2 is a child of p1, otherwise false. 3571 */ 3572 bool 3573 prison_ischild(struct prison *pr1, struct prison *pr2) 3574 { 3575 3576 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3577 if (pr1 == pr2) 3578 return (true); 3579 return (false); 3580 } 3581 3582 /* 3583 * Return true if the prison is currently alive. A prison is alive if it 3584 * holds user references and it isn't being removed. 3585 */ 3586 bool 3587 prison_isalive(const struct prison *pr) 3588 { 3589 3590 if (__predict_false(pr->pr_state != PRISON_STATE_ALIVE)) 3591 return (false); 3592 return (true); 3593 } 3594 3595 /* 3596 * Return true if the prison is currently valid. A prison is valid if it has 3597 * been fully created, and is not being destroyed. Note that dying prisons 3598 * are still considered valid. Invalid prisons won't be found under normal 3599 * circumstances, as they're only put in that state by functions that have 3600 * an exclusive hold on allprison_lock. 3601 */ 3602 bool 3603 prison_isvalid(struct prison *pr) 3604 { 3605 3606 if (__predict_false(pr->pr_state == PRISON_STATE_INVALID)) 3607 return (false); 3608 if (__predict_false(refcount_load(&pr->pr_ref) == 0)) 3609 return (false); 3610 return (true); 3611 } 3612 3613 /* 3614 * Return true if the passed credential is in a jail and that jail does not 3615 * have its own virtual network stack, otherwise false. 3616 */ 3617 bool 3618 jailed_without_vnet(struct ucred *cred) 3619 { 3620 3621 if (!jailed(cred)) 3622 return (false); 3623 #ifdef VIMAGE 3624 if (prison_owns_vnet(cred)) 3625 return (false); 3626 #endif 3627 3628 return (true); 3629 } 3630 3631 /* 3632 * Return the correct hostname (domainname, et al) for the passed credential. 3633 */ 3634 void 3635 getcredhostname(struct ucred *cred, char *buf, size_t size) 3636 { 3637 struct prison *pr; 3638 3639 /* 3640 * A NULL credential can be used to shortcut to the physical 3641 * system's hostname. 3642 */ 3643 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3644 mtx_lock(&pr->pr_mtx); 3645 strlcpy(buf, pr->pr_hostname, size); 3646 mtx_unlock(&pr->pr_mtx); 3647 } 3648 3649 void 3650 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3651 { 3652 3653 mtx_lock(&cred->cr_prison->pr_mtx); 3654 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3655 mtx_unlock(&cred->cr_prison->pr_mtx); 3656 } 3657 3658 void 3659 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3660 { 3661 3662 mtx_lock(&cred->cr_prison->pr_mtx); 3663 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3664 mtx_unlock(&cred->cr_prison->pr_mtx); 3665 } 3666 3667 void 3668 getcredhostid(struct ucred *cred, unsigned long *hostid) 3669 { 3670 3671 mtx_lock(&cred->cr_prison->pr_mtx); 3672 *hostid = cred->cr_prison->pr_hostid; 3673 mtx_unlock(&cred->cr_prison->pr_mtx); 3674 } 3675 3676 void 3677 getjailname(struct ucred *cred, char *name, size_t len) 3678 { 3679 3680 mtx_lock(&cred->cr_prison->pr_mtx); 3681 strlcpy(name, cred->cr_prison->pr_name, len); 3682 mtx_unlock(&cred->cr_prison->pr_mtx); 3683 } 3684 3685 #ifdef VIMAGE 3686 /* 3687 * Determine whether the prison represented by cred owns 3688 * its vnet rather than having it inherited. 3689 * 3690 * Returns true in case the prison owns the vnet, false otherwise. 3691 */ 3692 bool 3693 prison_owns_vnet(struct ucred *cred) 3694 { 3695 3696 /* 3697 * vnets cannot be added/removed after jail creation, 3698 * so no need to lock here. 3699 */ 3700 return ((cred->cr_prison->pr_flags & PR_VNET) != 0); 3701 } 3702 #endif 3703 3704 /* 3705 * Determine whether the subject represented by cred can "see" 3706 * status of a mount point. 3707 * Returns: 0 for permitted, ENOENT otherwise. 3708 * XXX: This function should be called cr_canseemount() and should be 3709 * placed in kern_prot.c. 3710 */ 3711 int 3712 prison_canseemount(struct ucred *cred, struct mount *mp) 3713 { 3714 struct prison *pr; 3715 struct statfs *sp; 3716 size_t len; 3717 3718 pr = cred->cr_prison; 3719 if (pr->pr_enforce_statfs == 0) 3720 return (0); 3721 if (pr->pr_root->v_mount == mp) 3722 return (0); 3723 if (pr->pr_enforce_statfs == 2) 3724 return (ENOENT); 3725 /* 3726 * If jail's chroot directory is set to "/" we should be able to see 3727 * all mount-points from inside a jail. 3728 * This is ugly check, but this is the only situation when jail's 3729 * directory ends with '/'. 3730 */ 3731 if (strcmp(pr->pr_path, "/") == 0) 3732 return (0); 3733 len = strlen(pr->pr_path); 3734 sp = &mp->mnt_stat; 3735 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3736 return (ENOENT); 3737 /* 3738 * Be sure that we don't have situation where jail's root directory 3739 * is "/some/path" and mount point is "/some/pathpath". 3740 */ 3741 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3742 return (ENOENT); 3743 return (0); 3744 } 3745 3746 void 3747 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3748 { 3749 char jpath[MAXPATHLEN]; 3750 struct prison *pr; 3751 size_t len; 3752 3753 pr = cred->cr_prison; 3754 if (pr->pr_enforce_statfs == 0) 3755 return; 3756 if (prison_canseemount(cred, mp) != 0) { 3757 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3758 strlcpy(sp->f_mntonname, "[restricted]", 3759 sizeof(sp->f_mntonname)); 3760 return; 3761 } 3762 if (pr->pr_root->v_mount == mp) { 3763 /* 3764 * Clear current buffer data, so we are sure nothing from 3765 * the valid path left there. 3766 */ 3767 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3768 *sp->f_mntonname = '/'; 3769 return; 3770 } 3771 /* 3772 * If jail's chroot directory is set to "/" we should be able to see 3773 * all mount-points from inside a jail. 3774 */ 3775 if (strcmp(pr->pr_path, "/") == 0) 3776 return; 3777 len = strlen(pr->pr_path); 3778 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3779 /* 3780 * Clear current buffer data, so we are sure nothing from 3781 * the valid path left there. 3782 */ 3783 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3784 if (*jpath == '\0') { 3785 /* Should never happen. */ 3786 *sp->f_mntonname = '/'; 3787 } else { 3788 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3789 } 3790 } 3791 3792 /* 3793 * Check with permission for a specific privilege is granted within jail. We 3794 * have a specific list of accepted privileges; the rest are denied. 3795 */ 3796 int 3797 prison_priv_check(struct ucred *cred, int priv) 3798 { 3799 struct prison *pr; 3800 int error; 3801 3802 /* 3803 * Some policies have custom handlers. This routine should not be 3804 * called for them. See priv_check_cred(). 3805 */ 3806 switch (priv) { 3807 case PRIV_VFS_LOOKUP: 3808 case PRIV_VFS_GENERATION: 3809 KASSERT(0, ("prison_priv_check instead of a custom handler " 3810 "called for %d\n", priv)); 3811 } 3812 3813 if (!jailed(cred)) 3814 return (0); 3815 3816 #ifdef VIMAGE 3817 /* 3818 * Privileges specific to prisons with a virtual network stack. 3819 * There might be a duplicate entry here in case the privilege 3820 * is only granted conditionally in the legacy jail case. 3821 */ 3822 switch (priv) { 3823 /* 3824 * NFS-specific privileges. 3825 */ 3826 case PRIV_NFS_DAEMON: 3827 case PRIV_VFS_GETFH: 3828 case PRIV_VFS_MOUNT_EXPORTED: 3829 if (!prison_check_nfsd(cred)) 3830 return (EPERM); 3831 #ifdef notyet 3832 case PRIV_NFS_LOCKD: 3833 #endif 3834 /* 3835 * Network stack privileges. 3836 */ 3837 case PRIV_NET_BRIDGE: 3838 case PRIV_NET_GRE: 3839 case PRIV_NET_BPF: 3840 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3841 case PRIV_NET_ROUTE: 3842 case PRIV_NET_TAP: 3843 case PRIV_NET_SETIFMTU: 3844 case PRIV_NET_SETIFFLAGS: 3845 case PRIV_NET_SETIFCAP: 3846 case PRIV_NET_SETIFDESCR: 3847 case PRIV_NET_SETIFNAME : 3848 case PRIV_NET_SETIFMETRIC: 3849 case PRIV_NET_SETIFPHYS: 3850 case PRIV_NET_SETIFMAC: 3851 case PRIV_NET_SETLANPCP: 3852 case PRIV_NET_ADDMULTI: 3853 case PRIV_NET_DELMULTI: 3854 case PRIV_NET_HWIOCTL: 3855 case PRIV_NET_SETLLADDR: 3856 case PRIV_NET_ADDIFGROUP: 3857 case PRIV_NET_DELIFGROUP: 3858 case PRIV_NET_IFCREATE: 3859 case PRIV_NET_IFDESTROY: 3860 case PRIV_NET_ADDIFADDR: 3861 case PRIV_NET_DELIFADDR: 3862 case PRIV_NET_LAGG: 3863 case PRIV_NET_GIF: 3864 case PRIV_NET_SETIFVNET: 3865 case PRIV_NET_SETIFFIB: 3866 case PRIV_NET_OVPN: 3867 case PRIV_NET_ME: 3868 case PRIV_NET_WG: 3869 3870 /* 3871 * 802.11-related privileges. 3872 */ 3873 case PRIV_NET80211_VAP_GETKEY: 3874 case PRIV_NET80211_VAP_MANAGE: 3875 3876 #ifdef notyet 3877 /* 3878 * ATM privileges. 3879 */ 3880 case PRIV_NETATM_CFG: 3881 case PRIV_NETATM_ADD: 3882 case PRIV_NETATM_DEL: 3883 case PRIV_NETATM_SET: 3884 3885 /* 3886 * Bluetooth privileges. 3887 */ 3888 case PRIV_NETBLUETOOTH_RAW: 3889 #endif 3890 3891 /* 3892 * Netgraph and netgraph module privileges. 3893 */ 3894 case PRIV_NETGRAPH_CONTROL: 3895 #ifdef notyet 3896 case PRIV_NETGRAPH_TTY: 3897 #endif 3898 3899 /* 3900 * IPv4 and IPv6 privileges. 3901 */ 3902 case PRIV_NETINET_IPFW: 3903 case PRIV_NETINET_DIVERT: 3904 case PRIV_NETINET_PF: 3905 case PRIV_NETINET_DUMMYNET: 3906 case PRIV_NETINET_CARP: 3907 case PRIV_NETINET_MROUTE: 3908 case PRIV_NETINET_RAW: 3909 case PRIV_NETINET_ADDRCTRL6: 3910 case PRIV_NETINET_ND6: 3911 case PRIV_NETINET_SCOPE6: 3912 case PRIV_NETINET_ALIFETIME6: 3913 case PRIV_NETINET_IPSEC: 3914 case PRIV_NETINET_BINDANY: 3915 3916 #ifdef notyet 3917 /* 3918 * NCP privileges. 3919 */ 3920 case PRIV_NETNCP: 3921 3922 /* 3923 * SMB privileges. 3924 */ 3925 case PRIV_NETSMB: 3926 #endif 3927 3928 /* 3929 * No default: or deny here. 3930 * In case of no permit fall through to next switch(). 3931 */ 3932 if (cred->cr_prison->pr_flags & PR_VNET) 3933 return (0); 3934 } 3935 #endif /* VIMAGE */ 3936 3937 switch (priv) { 3938 /* 3939 * Allow ktrace privileges for root in jail. 3940 */ 3941 case PRIV_KTRACE: 3942 3943 #if 0 3944 /* 3945 * Allow jailed processes to configure audit identity and 3946 * submit audit records (login, etc). In the future we may 3947 * want to further refine the relationship between audit and 3948 * jail. 3949 */ 3950 case PRIV_AUDIT_GETAUDIT: 3951 case PRIV_AUDIT_SETAUDIT: 3952 case PRIV_AUDIT_SUBMIT: 3953 #endif 3954 3955 /* 3956 * Allow jailed processes to manipulate process UNIX 3957 * credentials in any way they see fit. 3958 */ 3959 case PRIV_CRED_SETUID: 3960 case PRIV_CRED_SETEUID: 3961 case PRIV_CRED_SETGID: 3962 case PRIV_CRED_SETEGID: 3963 case PRIV_CRED_SETGROUPS: 3964 case PRIV_CRED_SETREUID: 3965 case PRIV_CRED_SETREGID: 3966 case PRIV_CRED_SETRESUID: 3967 case PRIV_CRED_SETRESGID: 3968 3969 /* 3970 * Jail implements visibility constraints already, so allow 3971 * jailed root to override uid/gid-based constraints. 3972 */ 3973 case PRIV_SEEOTHERGIDS: 3974 case PRIV_SEEOTHERUIDS: 3975 case PRIV_SEEJAILPROC: 3976 3977 /* 3978 * Jail implements inter-process debugging limits already, so 3979 * allow jailed root various debugging privileges. 3980 */ 3981 case PRIV_DEBUG_DIFFCRED: 3982 case PRIV_DEBUG_SUGID: 3983 case PRIV_DEBUG_UNPRIV: 3984 3985 /* 3986 * Allow jail to set various resource limits and login 3987 * properties, and for now, exceed process resource limits. 3988 */ 3989 case PRIV_PROC_LIMIT: 3990 case PRIV_PROC_SETLOGIN: 3991 case PRIV_PROC_SETRLIMIT: 3992 3993 /* 3994 * System V and POSIX IPC privileges are granted in jail. 3995 */ 3996 case PRIV_IPC_READ: 3997 case PRIV_IPC_WRITE: 3998 case PRIV_IPC_ADMIN: 3999 case PRIV_IPC_MSGSIZE: 4000 case PRIV_MQ_ADMIN: 4001 4002 /* 4003 * Jail operations within a jail work on child jails. 4004 */ 4005 case PRIV_JAIL_ATTACH: 4006 case PRIV_JAIL_SET: 4007 case PRIV_JAIL_REMOVE: 4008 4009 /* 4010 * Jail implements its own inter-process limits, so allow 4011 * root processes in jail to change scheduling on other 4012 * processes in the same jail. Likewise for signalling. 4013 */ 4014 case PRIV_SCHED_DIFFCRED: 4015 case PRIV_SCHED_CPUSET: 4016 case PRIV_SIGNAL_DIFFCRED: 4017 case PRIV_SIGNAL_SUGID: 4018 4019 /* 4020 * Allow jailed processes to write to sysctls marked as jail 4021 * writable. 4022 */ 4023 case PRIV_SYSCTL_WRITEJAIL: 4024 4025 /* 4026 * Allow root in jail to manage a variety of quota 4027 * properties. These should likely be conditional on a 4028 * configuration option. 4029 */ 4030 case PRIV_VFS_GETQUOTA: 4031 case PRIV_VFS_SETQUOTA: 4032 4033 /* 4034 * Since Jail relies on chroot() to implement file system 4035 * protections, grant many VFS privileges to root in jail. 4036 * Be careful to exclude mount-related and NFS-related 4037 * privileges. 4038 */ 4039 case PRIV_VFS_READ: 4040 case PRIV_VFS_WRITE: 4041 case PRIV_VFS_ADMIN: 4042 case PRIV_VFS_EXEC: 4043 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 4044 case PRIV_VFS_CHFLAGS_DEV: 4045 case PRIV_VFS_CHOWN: 4046 case PRIV_VFS_CHROOT: 4047 case PRIV_VFS_RETAINSUGID: 4048 case PRIV_VFS_FCHROOT: 4049 case PRIV_VFS_LINK: 4050 case PRIV_VFS_SETGID: 4051 case PRIV_VFS_STAT: 4052 case PRIV_VFS_STICKYFILE: 4053 4054 /* 4055 * As in the non-jail case, non-root users are expected to be 4056 * able to read kernel/physical memory (provided /dev/[k]mem 4057 * exists in the jail and they have permission to access it). 4058 */ 4059 case PRIV_KMEM_READ: 4060 return (0); 4061 4062 /* 4063 * Depending on the global setting, allow privilege of 4064 * setting system flags. 4065 */ 4066 case PRIV_VFS_SYSFLAGS: 4067 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 4068 return (0); 4069 else 4070 return (EPERM); 4071 4072 /* 4073 * Depending on the global setting, allow privilege of 4074 * mounting/unmounting file systems. 4075 */ 4076 case PRIV_VFS_MOUNT: 4077 case PRIV_VFS_UNMOUNT: 4078 case PRIV_VFS_MOUNT_NONUSER: 4079 case PRIV_VFS_MOUNT_OWNER: 4080 pr = cred->cr_prison; 4081 prison_lock(pr); 4082 if (pr->pr_allow & PR_ALLOW_MOUNT && pr->pr_enforce_statfs < 2) 4083 error = 0; 4084 else 4085 error = EPERM; 4086 prison_unlock(pr); 4087 return (error); 4088 4089 /* 4090 * Jails should hold no disposition on the PRIV_VFS_READ_DIR 4091 * policy. priv_check_cred will not specifically allow it, and 4092 * we may want a MAC policy to allow it. 4093 */ 4094 case PRIV_VFS_READ_DIR: 4095 return (0); 4096 4097 /* 4098 * Conditionally allow privileged process in the jail to 4099 * manipulate filesystem extended attributes in the system 4100 * namespace. 4101 */ 4102 case PRIV_VFS_EXTATTR_SYSTEM: 4103 if ((cred->cr_prison->pr_allow & PR_ALLOW_EXTATTR) != 0) 4104 return (0); 4105 else 4106 return (EPERM); 4107 4108 /* 4109 * Conditionnaly allow locking (unlocking) physical pages 4110 * in memory. 4111 */ 4112 case PRIV_VM_MLOCK: 4113 case PRIV_VM_MUNLOCK: 4114 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK) 4115 return (0); 4116 else 4117 return (EPERM); 4118 4119 /* 4120 * Conditionally allow jailed root to bind reserved ports. 4121 */ 4122 case PRIV_NETINET_RESERVEDPORT: 4123 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS) 4124 return (0); 4125 else 4126 return (EPERM); 4127 4128 /* 4129 * Allow jailed root to reuse in-use ports. 4130 */ 4131 case PRIV_NETINET_REUSEPORT: 4132 return (0); 4133 4134 /* 4135 * Allow jailed root to set certain IPv4/6 (option) headers. 4136 */ 4137 case PRIV_NETINET_SETHDROPTS: 4138 return (0); 4139 4140 /* 4141 * Conditionally allow creating raw sockets in jail. 4142 */ 4143 case PRIV_NETINET_RAW: 4144 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 4145 return (0); 4146 else 4147 return (EPERM); 4148 4149 /* 4150 * Since jail implements its own visibility limits on netstat 4151 * sysctls, allow getcred. This allows identd to work in 4152 * jail. 4153 */ 4154 case PRIV_NETINET_GETCRED: 4155 return (0); 4156 4157 /* 4158 * Allow jailed root to set loginclass. 4159 */ 4160 case PRIV_PROC_SETLOGINCLASS: 4161 return (0); 4162 4163 /* 4164 * Do not allow a process inside a jail to read the kernel 4165 * message buffer unless explicitly permitted. 4166 */ 4167 case PRIV_MSGBUF: 4168 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF) 4169 return (0); 4170 return (EPERM); 4171 4172 /* 4173 * Conditionally allow privileged process in the jail adjust 4174 * machine time. 4175 */ 4176 case PRIV_ADJTIME: 4177 case PRIV_NTP_ADJTIME: 4178 if (cred->cr_prison->pr_allow & 4179 (PR_ALLOW_ADJTIME | PR_ALLOW_SETTIME)) { 4180 return (0); 4181 } 4182 return (EPERM); 4183 4184 /* 4185 * Conditionally allow privileged process in the jail set 4186 * machine time. 4187 */ 4188 case PRIV_CLOCK_SETTIME: 4189 if (cred->cr_prison->pr_allow & PR_ALLOW_SETTIME) 4190 return (0); 4191 else 4192 return (EPERM); 4193 4194 default: 4195 /* 4196 * In all remaining cases, deny the privilege request. This 4197 * includes almost all network privileges, many system 4198 * configuration privileges. 4199 */ 4200 return (EPERM); 4201 } 4202 } 4203 4204 /* 4205 * Return the part of pr2's name that is relative to pr1, or the whole name 4206 * if it does not directly follow. 4207 */ 4208 4209 char * 4210 prison_name(struct prison *pr1, struct prison *pr2) 4211 { 4212 char *name; 4213 4214 /* Jails see themselves as "0" (if they see themselves at all). */ 4215 if (pr1 == pr2) 4216 return "0"; 4217 name = pr2->pr_name; 4218 if (prison_ischild(pr1, pr2)) { 4219 /* 4220 * pr1 isn't locked (and allprison_lock may not be either) 4221 * so its length can't be counted on. But the number of dots 4222 * can be counted on - and counted. 4223 */ 4224 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 4225 name = strchr(name, '.') + 1; 4226 } 4227 return (name); 4228 } 4229 4230 /* 4231 * Return the part of pr2's path that is relative to pr1, or the whole path 4232 * if it does not directly follow. 4233 */ 4234 static char * 4235 prison_path(struct prison *pr1, struct prison *pr2) 4236 { 4237 char *path1, *path2; 4238 int len1; 4239 4240 path1 = pr1->pr_path; 4241 path2 = pr2->pr_path; 4242 if (!strcmp(path1, "/")) 4243 return (path2); 4244 len1 = strlen(path1); 4245 if (strncmp(path1, path2, len1)) 4246 return (path2); 4247 if (path2[len1] == '\0') 4248 return "/"; 4249 if (path2[len1] == '/') 4250 return (path2 + len1); 4251 return (path2); 4252 } 4253 4254 /* 4255 * Jail-related sysctls. 4256 */ 4257 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 4258 "Jails"); 4259 4260 #if defined(INET) || defined(INET6) 4261 /* 4262 * Copy address array to memory that would be then SYSCTL_OUT-ed. 4263 * sysctl_jail_list() helper. 4264 */ 4265 static void 4266 prison_ip_copyout(struct prison *pr, const pr_family_t af, void **out, int *len) 4267 { 4268 const struct prison_ip *pip; 4269 const size_t size = pr_families[af].size; 4270 4271 again: 4272 mtx_assert(&pr->pr_mtx, MA_OWNED); 4273 if ((pip = pr->pr_addrs[af]) != NULL) { 4274 if (*len < pip->ips) { 4275 *len = pip->ips; 4276 mtx_unlock(&pr->pr_mtx); 4277 *out = realloc(*out, *len * size, M_TEMP, M_WAITOK); 4278 mtx_lock(&pr->pr_mtx); 4279 goto again; 4280 } 4281 bcopy(pip->pr_ip, *out, pip->ips * size); 4282 } 4283 } 4284 #endif 4285 4286 static int 4287 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4288 { 4289 struct xprison *xp; 4290 struct prison *pr, *cpr; 4291 #ifdef INET 4292 struct in_addr *ip4 = NULL; 4293 int ip4s = 0; 4294 #endif 4295 #ifdef INET6 4296 struct in6_addr *ip6 = NULL; 4297 int ip6s = 0; 4298 #endif 4299 int descend, error; 4300 4301 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4302 pr = req->td->td_ucred->cr_prison; 4303 error = 0; 4304 sx_slock(&allprison_lock); 4305 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4306 mtx_lock(&cpr->pr_mtx); 4307 #ifdef INET 4308 prison_ip_copyout(cpr, PR_INET, (void **)&ip4, &ip4s); 4309 #endif 4310 #ifdef INET6 4311 prison_ip_copyout(cpr, PR_INET6, (void **)&ip6, &ip6s); 4312 #endif 4313 bzero(xp, sizeof(*xp)); 4314 xp->pr_version = XPRISON_VERSION; 4315 xp->pr_id = cpr->pr_id; 4316 xp->pr_state = cpr->pr_state; 4317 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4318 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4319 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4320 #ifdef INET 4321 xp->pr_ip4s = ip4s; 4322 #endif 4323 #ifdef INET6 4324 xp->pr_ip6s = ip6s; 4325 #endif 4326 mtx_unlock(&cpr->pr_mtx); 4327 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4328 if (error) 4329 break; 4330 #ifdef INET 4331 if (xp->pr_ip4s > 0) { 4332 error = SYSCTL_OUT(req, ip4, 4333 xp->pr_ip4s * sizeof(struct in_addr)); 4334 if (error) 4335 break; 4336 } 4337 #endif 4338 #ifdef INET6 4339 if (xp->pr_ip6s > 0) { 4340 error = SYSCTL_OUT(req, ip6, 4341 xp->pr_ip6s * sizeof(struct in6_addr)); 4342 if (error) 4343 break; 4344 } 4345 #endif 4346 } 4347 sx_sunlock(&allprison_lock); 4348 free(xp, M_TEMP); 4349 #ifdef INET 4350 free(ip4, M_TEMP); 4351 #endif 4352 #ifdef INET6 4353 free(ip6, M_TEMP); 4354 #endif 4355 return (error); 4356 } 4357 4358 SYSCTL_OID(_security_jail, OID_AUTO, list, 4359 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4360 sysctl_jail_list, "S", "List of active jails"); 4361 4362 static int 4363 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4364 { 4365 int error, injail; 4366 4367 injail = jailed(req->td->td_ucred); 4368 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4369 4370 return (error); 4371 } 4372 4373 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4374 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4375 sysctl_jail_jailed, "I", "Process in jail?"); 4376 4377 static int 4378 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4379 { 4380 int error, havevnet; 4381 #ifdef VIMAGE 4382 struct ucred *cred = req->td->td_ucred; 4383 4384 havevnet = jailed(cred) && prison_owns_vnet(cred); 4385 #else 4386 havevnet = 0; 4387 #endif 4388 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4389 4390 return (error); 4391 } 4392 4393 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4394 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4395 sysctl_jail_vnet, "I", "Jail owns vnet?"); 4396 4397 #if defined(INET) || defined(INET6) 4398 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4399 &jail_max_af_ips, 0, 4400 "Number of IP addresses a jail may have at most per address family (deprecated)"); 4401 #endif 4402 4403 /* 4404 * Default parameters for jail(2) compatibility. For historical reasons, 4405 * the sysctl names have varying similarity to the parameter names. Prisons 4406 * just see their own parameters, and can't change them. 4407 */ 4408 static int 4409 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4410 { 4411 int error, i; 4412 4413 /* Get the current flag value, and convert it to a boolean. */ 4414 if (req->td->td_ucred->cr_prison == &prison0) { 4415 mtx_lock(&prison0.pr_mtx); 4416 i = (jail_default_allow & arg2) != 0; 4417 mtx_unlock(&prison0.pr_mtx); 4418 } else 4419 i = prison_allow(req->td->td_ucred, arg2); 4420 4421 if (arg1 != NULL) 4422 i = !i; 4423 error = sysctl_handle_int(oidp, &i, 0, req); 4424 if (error || !req->newptr) 4425 return (error); 4426 i = i ? arg2 : 0; 4427 if (arg1 != NULL) 4428 i ^= arg2; 4429 /* 4430 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4431 * for writing. 4432 */ 4433 mtx_lock(&prison0.pr_mtx); 4434 jail_default_allow = (jail_default_allow & ~arg2) | i; 4435 mtx_unlock(&prison0.pr_mtx); 4436 return (0); 4437 } 4438 4439 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4440 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4441 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4442 "Processes in jail can set their hostnames (deprecated)"); 4443 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4444 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4445 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4446 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 4447 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4448 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4449 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4450 "Processes in jail can use System V IPC primitives (deprecated)"); 4451 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4452 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4453 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4454 "Prison root can create raw sockets (deprecated)"); 4455 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4456 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4457 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4458 "Processes in jail can alter system file flags (deprecated)"); 4459 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4460 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4461 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4462 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 4463 SYSCTL_PROC(_security_jail, OID_AUTO, mlock_allowed, 4464 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4465 NULL, PR_ALLOW_MLOCK, sysctl_jail_default_allow, "I", 4466 "Processes in jail can lock/unlock physical pages in memory"); 4467 4468 static int 4469 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4470 { 4471 struct prison *pr; 4472 int level, error; 4473 4474 pr = req->td->td_ucred->cr_prison; 4475 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4476 error = sysctl_handle_int(oidp, &level, 0, req); 4477 if (error || !req->newptr) 4478 return (error); 4479 *(int *)arg1 = level; 4480 return (0); 4481 } 4482 4483 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4484 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4485 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4486 sysctl_jail_default_level, "I", 4487 "Processes in jail cannot see all mounted file systems (deprecated)"); 4488 4489 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4490 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4491 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4492 sysctl_jail_default_level, "I", 4493 "Ruleset for the devfs filesystem in jail (deprecated)"); 4494 4495 SYSCTL_NODE(_security_jail, OID_AUTO, children, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 4496 "Limits and stats of child jails"); 4497 4498 static int 4499 sysctl_jail_children(SYSCTL_HANDLER_ARGS) 4500 { 4501 struct prison *pr; 4502 int i; 4503 4504 pr = req->td->td_ucred->cr_prison; 4505 4506 switch (oidp->oid_kind & CTLTYPE) { 4507 case CTLTYPE_INT: 4508 i = *(int *)((char *)pr + arg2); 4509 return (SYSCTL_OUT(req, &i, sizeof(i))); 4510 } 4511 4512 return (0); 4513 } 4514 4515 SYSCTL_PROC(_security_jail_children, OID_AUTO, max, 4516 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4517 NULL, offsetof(struct prison, pr_childmax), sysctl_jail_children, 4518 "I", "Maximum number of child jails"); 4519 SYSCTL_PROC(_security_jail_children, OID_AUTO, cur, 4520 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4521 NULL, offsetof(struct prison, pr_childcount), sysctl_jail_children, 4522 "I", "Current number of child jails"); 4523 4524 /* 4525 * Nodes to describe jail parameters. Maximum length of string parameters 4526 * is returned in the string itself, and the other parameters exist merely 4527 * to make themselves and their types known. 4528 */ 4529 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 4530 "Jail parameters"); 4531 4532 int 4533 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4534 { 4535 int i; 4536 long l; 4537 size_t s; 4538 char numbuf[12]; 4539 4540 switch (oidp->oid_kind & CTLTYPE) 4541 { 4542 case CTLTYPE_LONG: 4543 case CTLTYPE_ULONG: 4544 l = 0; 4545 #ifdef SCTL_MASK32 4546 if (!(req->flags & SCTL_MASK32)) 4547 #endif 4548 return (SYSCTL_OUT(req, &l, sizeof(l))); 4549 case CTLTYPE_INT: 4550 case CTLTYPE_UINT: 4551 i = 0; 4552 return (SYSCTL_OUT(req, &i, sizeof(i))); 4553 case CTLTYPE_STRING: 4554 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4555 return 4556 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4557 case CTLTYPE_STRUCT: 4558 s = (size_t)arg2; 4559 return (SYSCTL_OUT(req, &s, sizeof(s))); 4560 } 4561 return (0); 4562 } 4563 4564 /* 4565 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 4566 * jail creation time but cannot be changed in an existing jail. 4567 */ 4568 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4569 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4570 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4571 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4572 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4573 "I", "Jail secure level"); 4574 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 4575 "Jail value for kern.osreldate and uname -K"); 4576 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 4577 "Jail value for kern.osrelease and uname -r"); 4578 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4579 "I", "Jail cannot see all mounted file systems"); 4580 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4581 "I", "Ruleset for in-jail devfs mounts"); 4582 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4583 "B", "Jail persistence"); 4584 #ifdef VIMAGE 4585 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4586 "E,jailsys", "Virtual network stack"); 4587 #endif 4588 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4589 "B", "Jail is in the process of shutting down"); 4590 4591 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4592 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4593 "I", "Current number of child jails"); 4594 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4595 "I", "Maximum number of child jails"); 4596 4597 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4598 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4599 "Jail hostname"); 4600 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4601 "Jail NIS domainname"); 4602 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4603 "Jail host UUID"); 4604 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4605 "LU", "Jail host ID"); 4606 4607 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4608 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4609 4610 #ifdef INET 4611 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4612 "Jail IPv4 address virtualization"); 4613 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4614 "S,in_addr,a", "Jail IPv4 addresses"); 4615 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4616 "B", "Do (not) use IPv4 source address selection rather than the " 4617 "primary jail IPv4 address."); 4618 #endif 4619 #ifdef INET6 4620 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4621 "Jail IPv6 address virtualization"); 4622 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4623 "S,in6_addr,a", "Jail IPv6 addresses"); 4624 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4625 "B", "Do (not) use IPv6 source address selection rather than the " 4626 "primary jail IPv6 address."); 4627 #endif 4628 4629 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4630 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4631 "B", "Jail may set hostname"); 4632 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4633 "B", "Jail may use SYSV IPC"); 4634 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4635 "B", "Jail may create raw sockets"); 4636 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4637 "B", "Jail may alter system file flags"); 4638 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4639 "B", "Jail may set file quotas"); 4640 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4641 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4642 SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW, 4643 "B", "Jail may lock (unlock) physical pages in memory"); 4644 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW, 4645 "B", "Jail may bind sockets to reserved ports"); 4646 SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW, 4647 "B", "Jail may read the kernel message buffer"); 4648 SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW, 4649 "B", "Unprivileged processes may use process debugging facilities"); 4650 SYSCTL_JAIL_PARAM(_allow, suser, CTLTYPE_INT | CTLFLAG_RW, 4651 "B", "Processes in jail with uid 0 have privilege"); 4652 #ifdef VIMAGE 4653 SYSCTL_JAIL_PARAM(_allow, nfsd, CTLTYPE_INT | CTLFLAG_RW, 4654 "B", "Mountd/nfsd may run in the jail"); 4655 #endif 4656 SYSCTL_JAIL_PARAM(_allow, extattr, CTLTYPE_INT | CTLFLAG_RW, 4657 "B", "Jail may set system-level filesystem extended attributes"); 4658 SYSCTL_JAIL_PARAM(_allow, adjtime, CTLTYPE_INT | CTLFLAG_RW, 4659 "B", "Jail may adjust system time"); 4660 SYSCTL_JAIL_PARAM(_allow, settime, CTLTYPE_INT | CTLFLAG_RW, 4661 "B", "Jail may set system time"); 4662 4663 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4664 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4665 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4666 4667 /* 4668 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return 4669 * its associated bit in the pr_allow bitmask, or zero if the parameter was 4670 * not created. 4671 */ 4672 unsigned 4673 prison_add_allow(const char *prefix, const char *name, const char *prefix_descr, 4674 const char *descr) 4675 { 4676 struct bool_flags *bf; 4677 struct sysctl_oid *parent; 4678 char *allow_name, *allow_noname, *allowed; 4679 #ifndef NO_SYSCTL_DESCR 4680 char *descr_deprecated; 4681 #endif 4682 u_int allow_flag; 4683 4684 if (prefix 4685 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name) 4686 < 0 || 4687 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name) 4688 < 0 4689 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 || 4690 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) { 4691 free(allow_name, M_PRISON); 4692 return 0; 4693 } 4694 4695 /* 4696 * See if this parameter has already beed added, i.e. a module was 4697 * previously loaded/unloaded. 4698 */ 4699 mtx_lock(&prison0.pr_mtx); 4700 for (bf = pr_flag_allow; 4701 bf < pr_flag_allow + nitems(pr_flag_allow) && 4702 atomic_load_int(&bf->flag) != 0; 4703 bf++) { 4704 if (strcmp(bf->name, allow_name) == 0) { 4705 allow_flag = bf->flag; 4706 goto no_add; 4707 } 4708 } 4709 4710 /* 4711 * Find a free bit in pr_allow_all, failing if there are none 4712 * (which shouldn't happen as long as we keep track of how many 4713 * potential dynamic flags exist). 4714 */ 4715 for (allow_flag = 1;; allow_flag <<= 1) { 4716 if (allow_flag == 0) 4717 goto no_add; 4718 if ((pr_allow_all & allow_flag) == 0) 4719 break; 4720 } 4721 4722 /* Note the parameter in the next open slot in pr_flag_allow. */ 4723 for (bf = pr_flag_allow; ; bf++) { 4724 if (bf == pr_flag_allow + nitems(pr_flag_allow)) { 4725 /* This should never happen, but is not fatal. */ 4726 allow_flag = 0; 4727 goto no_add; 4728 } 4729 if (atomic_load_int(&bf->flag) == 0) 4730 break; 4731 } 4732 bf->name = allow_name; 4733 bf->noname = allow_noname; 4734 pr_allow_all |= allow_flag; 4735 /* 4736 * prison0 always has permission for the new parameter. 4737 * Other jails must have it granted to them. 4738 */ 4739 prison0.pr_allow |= allow_flag; 4740 /* The flag indicates a valid entry, so make sure it is set last. */ 4741 atomic_store_rel_int(&bf->flag, allow_flag); 4742 mtx_unlock(&prison0.pr_mtx); 4743 4744 /* 4745 * Create sysctls for the parameter, and the back-compat global 4746 * permission. 4747 */ 4748 parent = prefix 4749 ? SYSCTL_ADD_NODE(NULL, 4750 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow), 4751 OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr) 4752 : &sysctl___security_jail_param_allow; 4753 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO, 4754 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4755 NULL, 0, sysctl_jail_param, "B", descr); 4756 if ((prefix 4757 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name) 4758 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) { 4759 #ifndef NO_SYSCTL_DESCR 4760 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)", 4761 descr); 4762 #endif 4763 (void)SYSCTL_ADD_PROC(NULL, 4764 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed, 4765 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag, 4766 sysctl_jail_default_allow, "I", descr_deprecated); 4767 #ifndef NO_SYSCTL_DESCR 4768 free(descr_deprecated, M_TEMP); 4769 #endif 4770 free(allowed, M_TEMP); 4771 } 4772 return allow_flag; 4773 4774 no_add: 4775 mtx_unlock(&prison0.pr_mtx); 4776 free(allow_name, M_PRISON); 4777 free(allow_noname, M_PRISON); 4778 return allow_flag; 4779 } 4780 4781 /* 4782 * The VFS system will register jail-aware filesystems here. They each get 4783 * a parameter allow.mount.xxxfs and a flag to check when a jailed user 4784 * attempts to mount. 4785 */ 4786 void 4787 prison_add_vfs(struct vfsconf *vfsp) 4788 { 4789 #ifdef NO_SYSCTL_DESCR 4790 4791 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 4792 NULL, NULL); 4793 #else 4794 char *descr; 4795 4796 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system", 4797 vfsp->vfc_name); 4798 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name, 4799 NULL, descr); 4800 free(descr, M_TEMP); 4801 #endif 4802 } 4803 4804 #ifdef RACCT 4805 void 4806 prison_racct_foreach(void (*callback)(struct racct *racct, 4807 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 4808 void *arg2, void *arg3) 4809 { 4810 struct prison_racct *prr; 4811 4812 ASSERT_RACCT_ENABLED(); 4813 4814 sx_slock(&allprison_lock); 4815 if (pre != NULL) 4816 (pre)(); 4817 LIST_FOREACH(prr, &allprison_racct, prr_next) 4818 (callback)(prr->prr_racct, arg2, arg3); 4819 if (post != NULL) 4820 (post)(); 4821 sx_sunlock(&allprison_lock); 4822 } 4823 4824 static struct prison_racct * 4825 prison_racct_find_locked(const char *name) 4826 { 4827 struct prison_racct *prr; 4828 4829 ASSERT_RACCT_ENABLED(); 4830 sx_assert(&allprison_lock, SA_XLOCKED); 4831 4832 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4833 return (NULL); 4834 4835 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4836 if (strcmp(name, prr->prr_name) != 0) 4837 continue; 4838 4839 /* Found prison_racct with a matching name? */ 4840 prison_racct_hold(prr); 4841 return (prr); 4842 } 4843 4844 /* Add new prison_racct. */ 4845 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4846 racct_create(&prr->prr_racct); 4847 4848 strcpy(prr->prr_name, name); 4849 refcount_init(&prr->prr_refcount, 1); 4850 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4851 4852 return (prr); 4853 } 4854 4855 struct prison_racct * 4856 prison_racct_find(const char *name) 4857 { 4858 struct prison_racct *prr; 4859 4860 ASSERT_RACCT_ENABLED(); 4861 4862 sx_xlock(&allprison_lock); 4863 prr = prison_racct_find_locked(name); 4864 sx_xunlock(&allprison_lock); 4865 return (prr); 4866 } 4867 4868 void 4869 prison_racct_hold(struct prison_racct *prr) 4870 { 4871 4872 ASSERT_RACCT_ENABLED(); 4873 4874 refcount_acquire(&prr->prr_refcount); 4875 } 4876 4877 static void 4878 prison_racct_free_locked(struct prison_racct *prr) 4879 { 4880 4881 ASSERT_RACCT_ENABLED(); 4882 sx_assert(&allprison_lock, SA_XLOCKED); 4883 4884 if (refcount_release(&prr->prr_refcount)) { 4885 racct_destroy(&prr->prr_racct); 4886 LIST_REMOVE(prr, prr_next); 4887 free(prr, M_PRISON_RACCT); 4888 } 4889 } 4890 4891 void 4892 prison_racct_free(struct prison_racct *prr) 4893 { 4894 4895 ASSERT_RACCT_ENABLED(); 4896 sx_assert(&allprison_lock, SA_UNLOCKED); 4897 4898 if (refcount_release_if_not_last(&prr->prr_refcount)) 4899 return; 4900 4901 sx_xlock(&allprison_lock); 4902 prison_racct_free_locked(prr); 4903 sx_xunlock(&allprison_lock); 4904 } 4905 4906 static void 4907 prison_racct_attach(struct prison *pr) 4908 { 4909 struct prison_racct *prr; 4910 4911 ASSERT_RACCT_ENABLED(); 4912 sx_assert(&allprison_lock, SA_XLOCKED); 4913 4914 prr = prison_racct_find_locked(pr->pr_name); 4915 KASSERT(prr != NULL, ("cannot find prison_racct")); 4916 4917 pr->pr_prison_racct = prr; 4918 } 4919 4920 /* 4921 * Handle jail renaming. From the racct point of view, renaming means 4922 * moving from one prison_racct to another. 4923 */ 4924 static void 4925 prison_racct_modify(struct prison *pr) 4926 { 4927 #ifdef RCTL 4928 struct proc *p; 4929 struct ucred *cred; 4930 #endif 4931 struct prison_racct *oldprr; 4932 4933 ASSERT_RACCT_ENABLED(); 4934 4935 sx_slock(&allproc_lock); 4936 sx_xlock(&allprison_lock); 4937 4938 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4939 sx_xunlock(&allprison_lock); 4940 sx_sunlock(&allproc_lock); 4941 return; 4942 } 4943 4944 oldprr = pr->pr_prison_racct; 4945 pr->pr_prison_racct = NULL; 4946 4947 prison_racct_attach(pr); 4948 4949 /* 4950 * Move resource utilisation records. 4951 */ 4952 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4953 4954 #ifdef RCTL 4955 /* 4956 * Force rctl to reattach rules to processes. 4957 */ 4958 FOREACH_PROC_IN_SYSTEM(p) { 4959 PROC_LOCK(p); 4960 cred = crhold(p->p_ucred); 4961 PROC_UNLOCK(p); 4962 rctl_proc_ucred_changed(p, cred); 4963 crfree(cred); 4964 } 4965 #endif 4966 4967 sx_sunlock(&allproc_lock); 4968 prison_racct_free_locked(oldprr); 4969 sx_xunlock(&allprison_lock); 4970 } 4971 4972 static void 4973 prison_racct_detach(struct prison *pr) 4974 { 4975 4976 ASSERT_RACCT_ENABLED(); 4977 sx_assert(&allprison_lock, SA_UNLOCKED); 4978 4979 if (pr->pr_prison_racct == NULL) 4980 return; 4981 prison_racct_free(pr->pr_prison_racct); 4982 pr->pr_prison_racct = NULL; 4983 } 4984 #endif /* RACCT */ 4985 4986 #ifdef DDB 4987 4988 static void 4989 db_show_prison(struct prison *pr) 4990 { 4991 struct bool_flags *bf; 4992 struct jailsys_flags *jsf; 4993 #if defined(INET) || defined(INET6) 4994 int ii; 4995 struct prison_ip *pip; 4996 #endif 4997 unsigned f; 4998 #ifdef INET 4999 char ip4buf[INET_ADDRSTRLEN]; 5000 #endif 5001 #ifdef INET6 5002 char ip6buf[INET6_ADDRSTRLEN]; 5003 #endif 5004 5005 db_printf("prison %p:\n", pr); 5006 db_printf(" jid = %d\n", pr->pr_id); 5007 db_printf(" name = %s\n", pr->pr_name); 5008 db_printf(" parent = %p\n", pr->pr_parent); 5009 db_printf(" ref = %d\n", pr->pr_ref); 5010 db_printf(" uref = %d\n", pr->pr_uref); 5011 db_printf(" state = %s\n", 5012 pr->pr_state == PRISON_STATE_ALIVE ? "alive" : 5013 pr->pr_state == PRISON_STATE_DYING ? "dying" : 5014 "invalid"); 5015 db_printf(" path = %s\n", pr->pr_path); 5016 db_printf(" cpuset = %d\n", pr->pr_cpuset 5017 ? pr->pr_cpuset->cs_id : -1); 5018 #ifdef VIMAGE 5019 db_printf(" vnet = %p\n", pr->pr_vnet); 5020 #endif 5021 db_printf(" root = %p\n", pr->pr_root); 5022 db_printf(" securelevel = %d\n", pr->pr_securelevel); 5023 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 5024 db_printf(" children.max = %d\n", pr->pr_childmax); 5025 db_printf(" children.cur = %d\n", pr->pr_childcount); 5026 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 5027 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 5028 db_printf(" flags = 0x%x", pr->pr_flags); 5029 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++) 5030 if (pr->pr_flags & bf->flag) 5031 db_printf(" %s", bf->name); 5032 for (jsf = pr_flag_jailsys; 5033 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys); 5034 jsf++) { 5035 f = pr->pr_flags & (jsf->disable | jsf->new); 5036 db_printf(" %-16s= %s\n", jsf->name, 5037 (f != 0 && f == jsf->disable) ? "disable" 5038 : (f == jsf->new) ? "new" 5039 : "inherit"); 5040 } 5041 db_printf(" allow = 0x%x", pr->pr_allow); 5042 for (bf = pr_flag_allow; 5043 bf < pr_flag_allow + nitems(pr_flag_allow) && 5044 atomic_load_int(&bf->flag) != 0; 5045 bf++) 5046 if (pr->pr_allow & bf->flag) 5047 db_printf(" %s", bf->name); 5048 db_printf("\n"); 5049 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 5050 db_printf(" host.hostname = %s\n", pr->pr_hostname); 5051 db_printf(" host.domainname = %s\n", pr->pr_domainname); 5052 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 5053 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 5054 #ifdef INET 5055 if ((pip = pr->pr_addrs[PR_INET]) != NULL) { 5056 db_printf(" ip4s = %d\n", pip->ips); 5057 for (ii = 0; ii < pip->ips; ii++) 5058 db_printf(" %s %s\n", 5059 ii == 0 ? "ip4.addr =" : " ", 5060 inet_ntoa_r( 5061 *(const struct in_addr *)PR_IP(pip, PR_INET, ii), 5062 ip4buf)); 5063 } 5064 #endif 5065 #ifdef INET6 5066 if ((pip = pr->pr_addrs[PR_INET6]) != NULL) { 5067 db_printf(" ip6s = %d\n", pip->ips); 5068 for (ii = 0; ii < pip->ips; ii++) 5069 db_printf(" %s %s\n", 5070 ii == 0 ? "ip6.addr =" : " ", 5071 ip6_sprintf(ip6buf, 5072 (const struct in6_addr *)PR_IP(pip, PR_INET6, ii))); 5073 } 5074 #endif 5075 } 5076 5077 DB_SHOW_COMMAND(prison, db_show_prison_command) 5078 { 5079 struct prison *pr; 5080 5081 if (!have_addr) { 5082 /* 5083 * Show all prisons in the list, and prison0 which is not 5084 * listed. 5085 */ 5086 db_show_prison(&prison0); 5087 if (!db_pager_quit) { 5088 TAILQ_FOREACH(pr, &allprison, pr_list) { 5089 db_show_prison(pr); 5090 if (db_pager_quit) 5091 break; 5092 } 5093 } 5094 return; 5095 } 5096 5097 if (addr == 0) 5098 pr = &prison0; 5099 else { 5100 /* Look for a prison with the ID and with references. */ 5101 TAILQ_FOREACH(pr, &allprison, pr_list) 5102 if (pr->pr_id == addr && pr->pr_ref > 0) 5103 break; 5104 if (pr == NULL) 5105 /* Look again, without requiring a reference. */ 5106 TAILQ_FOREACH(pr, &allprison, pr_list) 5107 if (pr->pr_id == addr) 5108 break; 5109 if (pr == NULL) 5110 /* Assume address points to a valid prison. */ 5111 pr = (struct prison *)addr; 5112 } 5113 db_show_prison(pr); 5114 } 5115 5116 #endif /* DDB */ 5117