1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1999 Poul-Henning Kamp. 5 * Copyright (c) 2008 Bjoern A. Zeeb. 6 * Copyright (c) 2009 James Gritton. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include "opt_compat.h" 35 #include "opt_ddb.h" 36 #include "opt_inet.h" 37 #include "opt_inet6.h" 38 39 #include <sys/param.h> 40 #include <sys/types.h> 41 #include <sys/kernel.h> 42 #include <sys/systm.h> 43 #include <sys/errno.h> 44 #include <sys/sysproto.h> 45 #include <sys/malloc.h> 46 #include <sys/osd.h> 47 #include <sys/priv.h> 48 #include <sys/proc.h> 49 #include <sys/taskqueue.h> 50 #include <sys/fcntl.h> 51 #include <sys/jail.h> 52 #include <sys/lock.h> 53 #include <sys/mutex.h> 54 #include <sys/racct.h> 55 #include <sys/refcount.h> 56 #include <sys/sx.h> 57 #include <sys/sysent.h> 58 #include <sys/namei.h> 59 #include <sys/mount.h> 60 #include <sys/queue.h> 61 #include <sys/socket.h> 62 #include <sys/syscallsubr.h> 63 #include <sys/sysctl.h> 64 #include <sys/vnode.h> 65 66 #include <net/if.h> 67 #include <net/vnet.h> 68 69 #include <netinet/in.h> 70 71 #ifdef DDB 72 #include <ddb/ddb.h> 73 #endif /* DDB */ 74 75 #include <security/mac/mac_framework.h> 76 77 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 78 79 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 80 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 81 82 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 83 #ifdef INET 84 #ifdef INET6 85 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 86 #else 87 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 88 #endif 89 #else /* !INET */ 90 #ifdef INET6 91 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 92 #else 93 #define _PR_IP_SADDRSEL 0 94 #endif 95 #endif 96 97 /* prison0 describes what is "real" about the system. */ 98 struct prison prison0 = { 99 .pr_id = 0, 100 .pr_name = "0", 101 .pr_ref = 1, 102 .pr_uref = 1, 103 .pr_path = "/", 104 .pr_securelevel = -1, 105 .pr_devfs_rsnum = 0, 106 .pr_childmax = JAIL_MAX, 107 .pr_hostuuid = DEFAULT_HOSTUUID, 108 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 109 #ifdef VIMAGE 110 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 111 #else 112 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 113 #endif 114 .pr_allow = PR_ALLOW_ALL, 115 }; 116 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 117 118 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 119 struct sx allprison_lock; 120 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 121 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 122 LIST_HEAD(, prison_racct) allprison_racct; 123 int lastprid = 0; 124 125 static int do_jail_attach(struct thread *td, struct prison *pr); 126 static void prison_complete(void *context, int pending); 127 static void prison_deref(struct prison *pr, int flags); 128 static char *prison_path(struct prison *pr1, struct prison *pr2); 129 static void prison_remove_one(struct prison *pr); 130 #ifdef RACCT 131 static void prison_racct_attach(struct prison *pr); 132 static void prison_racct_modify(struct prison *pr); 133 static void prison_racct_detach(struct prison *pr); 134 #endif 135 136 /* Flags for prison_deref */ 137 #define PD_DEREF 0x01 138 #define PD_DEUREF 0x02 139 #define PD_LOCKED 0x04 140 #define PD_LIST_SLOCKED 0x08 141 #define PD_LIST_XLOCKED 0x10 142 143 /* 144 * Parameter names corresponding to PR_* flag values. Size values are for kvm 145 * as we cannot figure out the size of a sparse array, or an array without a 146 * terminating entry. 147 */ 148 static char *pr_flag_names[] = { 149 [0] = "persist", 150 #ifdef INET 151 [7] = "ip4.saddrsel", 152 #endif 153 #ifdef INET6 154 [8] = "ip6.saddrsel", 155 #endif 156 }; 157 const size_t pr_flag_names_size = sizeof(pr_flag_names); 158 159 static char *pr_flag_nonames[] = { 160 [0] = "nopersist", 161 #ifdef INET 162 [7] = "ip4.nosaddrsel", 163 #endif 164 #ifdef INET6 165 [8] = "ip6.nosaddrsel", 166 #endif 167 }; 168 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames); 169 170 struct jailsys_flags { 171 const char *name; 172 unsigned disable; 173 unsigned new; 174 } pr_flag_jailsys[] = { 175 { "host", 0, PR_HOST }, 176 #ifdef VIMAGE 177 { "vnet", 0, PR_VNET }, 178 #endif 179 #ifdef INET 180 { "ip4", PR_IP4_USER, PR_IP4_USER }, 181 #endif 182 #ifdef INET6 183 { "ip6", PR_IP6_USER, PR_IP6_USER }, 184 #endif 185 }; 186 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 187 188 static char *pr_allow_names[] = { 189 "allow.set_hostname", 190 "allow.sysvipc", 191 "allow.raw_sockets", 192 "allow.chflags", 193 "allow.mount", 194 "allow.quotas", 195 "allow.socket_af", 196 "allow.mount.devfs", 197 "allow.mount.nullfs", 198 "allow.mount.zfs", 199 "allow.mount.procfs", 200 "allow.mount.tmpfs", 201 "allow.mount.fdescfs", 202 "allow.mount.linprocfs", 203 "allow.mount.linsysfs", 204 "allow.reserved_ports", 205 }; 206 const size_t pr_allow_names_size = sizeof(pr_allow_names); 207 208 static char *pr_allow_nonames[] = { 209 "allow.noset_hostname", 210 "allow.nosysvipc", 211 "allow.noraw_sockets", 212 "allow.nochflags", 213 "allow.nomount", 214 "allow.noquotas", 215 "allow.nosocket_af", 216 "allow.mount.nodevfs", 217 "allow.mount.nonullfs", 218 "allow.mount.nozfs", 219 "allow.mount.noprocfs", 220 "allow.mount.notmpfs", 221 "allow.mount.nofdescfs", 222 "allow.mount.nolinprocfs", 223 "allow.mount.nolinsysfs", 224 "allow.noreserved_ports", 225 }; 226 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames); 227 228 #define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | PR_ALLOW_RESERVED_PORTS) 229 #define JAIL_DEFAULT_ENFORCE_STATFS 2 230 #define JAIL_DEFAULT_DEVFS_RSNUM 0 231 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 232 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 233 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 234 #if defined(INET) || defined(INET6) 235 static unsigned jail_max_af_ips = 255; 236 #endif 237 238 /* 239 * Initialize the parts of prison0 that can't be static-initialized with 240 * constants. This is called from proc0_init() after creating thread0 cpuset. 241 */ 242 void 243 prison0_init(void) 244 { 245 246 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 247 prison0.pr_osreldate = osreldate; 248 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 249 } 250 251 /* 252 * struct jail_args { 253 * struct jail *jail; 254 * }; 255 */ 256 int 257 sys_jail(struct thread *td, struct jail_args *uap) 258 { 259 uint32_t version; 260 int error; 261 struct jail j; 262 263 error = copyin(uap->jail, &version, sizeof(uint32_t)); 264 if (error) 265 return (error); 266 267 switch (version) { 268 case 0: 269 { 270 struct jail_v0 j0; 271 272 /* FreeBSD single IPv4 jails. */ 273 bzero(&j, sizeof(struct jail)); 274 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 275 if (error) 276 return (error); 277 j.version = j0.version; 278 j.path = j0.path; 279 j.hostname = j0.hostname; 280 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 281 break; 282 } 283 284 case 1: 285 /* 286 * Version 1 was used by multi-IPv4 jail implementations 287 * that never made it into the official kernel. 288 */ 289 return (EINVAL); 290 291 case 2: /* JAIL_API_VERSION */ 292 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 293 error = copyin(uap->jail, &j, sizeof(struct jail)); 294 if (error) 295 return (error); 296 break; 297 298 default: 299 /* Sci-Fi jails are not supported, sorry. */ 300 return (EINVAL); 301 } 302 return (kern_jail(td, &j)); 303 } 304 305 int 306 kern_jail(struct thread *td, struct jail *j) 307 { 308 struct iovec optiov[2 * (4 + nitems(pr_allow_names) 309 #ifdef INET 310 + 1 311 #endif 312 #ifdef INET6 313 + 1 314 #endif 315 )]; 316 struct uio opt; 317 char *u_path, *u_hostname, *u_name; 318 #ifdef INET 319 uint32_t ip4s; 320 struct in_addr *u_ip4; 321 #endif 322 #ifdef INET6 323 struct in6_addr *u_ip6; 324 #endif 325 size_t tmplen; 326 int error, enforce_statfs, fi; 327 328 bzero(&optiov, sizeof(optiov)); 329 opt.uio_iov = optiov; 330 opt.uio_iovcnt = 0; 331 opt.uio_offset = -1; 332 opt.uio_resid = -1; 333 opt.uio_segflg = UIO_SYSSPACE; 334 opt.uio_rw = UIO_READ; 335 opt.uio_td = td; 336 337 /* Set permissions for top-level jails from sysctls. */ 338 if (!jailed(td->td_ucred)) { 339 for (fi = 0; fi < nitems(pr_allow_names); fi++) { 340 optiov[opt.uio_iovcnt].iov_base = 341 (jail_default_allow & (1 << fi)) 342 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 343 optiov[opt.uio_iovcnt].iov_len = 344 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 345 opt.uio_iovcnt += 2; 346 } 347 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 348 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 349 opt.uio_iovcnt++; 350 enforce_statfs = jail_default_enforce_statfs; 351 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 352 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 353 opt.uio_iovcnt++; 354 } 355 356 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 357 #ifdef INET 358 ip4s = (j->version == 0) ? 1 : j->ip4s; 359 if (ip4s > jail_max_af_ips) 360 return (EINVAL); 361 tmplen += ip4s * sizeof(struct in_addr); 362 #else 363 if (j->ip4s > 0) 364 return (EINVAL); 365 #endif 366 #ifdef INET6 367 if (j->ip6s > jail_max_af_ips) 368 return (EINVAL); 369 tmplen += j->ip6s * sizeof(struct in6_addr); 370 #else 371 if (j->ip6s > 0) 372 return (EINVAL); 373 #endif 374 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 375 u_hostname = u_path + MAXPATHLEN; 376 u_name = u_hostname + MAXHOSTNAMELEN; 377 #ifdef INET 378 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 379 #endif 380 #ifdef INET6 381 #ifdef INET 382 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 383 #else 384 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 385 #endif 386 #endif 387 optiov[opt.uio_iovcnt].iov_base = "path"; 388 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 389 opt.uio_iovcnt++; 390 optiov[opt.uio_iovcnt].iov_base = u_path; 391 error = copyinstr(j->path, u_path, MAXPATHLEN, 392 &optiov[opt.uio_iovcnt].iov_len); 393 if (error) { 394 free(u_path, M_TEMP); 395 return (error); 396 } 397 opt.uio_iovcnt++; 398 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 399 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 400 opt.uio_iovcnt++; 401 optiov[opt.uio_iovcnt].iov_base = u_hostname; 402 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 403 &optiov[opt.uio_iovcnt].iov_len); 404 if (error) { 405 free(u_path, M_TEMP); 406 return (error); 407 } 408 opt.uio_iovcnt++; 409 if (j->jailname != NULL) { 410 optiov[opt.uio_iovcnt].iov_base = "name"; 411 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 412 opt.uio_iovcnt++; 413 optiov[opt.uio_iovcnt].iov_base = u_name; 414 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 415 &optiov[opt.uio_iovcnt].iov_len); 416 if (error) { 417 free(u_path, M_TEMP); 418 return (error); 419 } 420 opt.uio_iovcnt++; 421 } 422 #ifdef INET 423 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 424 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 425 opt.uio_iovcnt++; 426 optiov[opt.uio_iovcnt].iov_base = u_ip4; 427 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 428 if (j->version == 0) 429 u_ip4->s_addr = j->ip4s; 430 else { 431 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 432 if (error) { 433 free(u_path, M_TEMP); 434 return (error); 435 } 436 } 437 opt.uio_iovcnt++; 438 #endif 439 #ifdef INET6 440 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 441 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 442 opt.uio_iovcnt++; 443 optiov[opt.uio_iovcnt].iov_base = u_ip6; 444 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 445 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 446 if (error) { 447 free(u_path, M_TEMP); 448 return (error); 449 } 450 opt.uio_iovcnt++; 451 #endif 452 KASSERT(opt.uio_iovcnt <= nitems(optiov), 453 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 454 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 455 free(u_path, M_TEMP); 456 return (error); 457 } 458 459 460 /* 461 * struct jail_set_args { 462 * struct iovec *iovp; 463 * unsigned int iovcnt; 464 * int flags; 465 * }; 466 */ 467 int 468 sys_jail_set(struct thread *td, struct jail_set_args *uap) 469 { 470 struct uio *auio; 471 int error; 472 473 /* Check that we have an even number of iovecs. */ 474 if (uap->iovcnt & 1) 475 return (EINVAL); 476 477 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 478 if (error) 479 return (error); 480 error = kern_jail_set(td, auio, uap->flags); 481 free(auio, M_IOV); 482 return (error); 483 } 484 485 int 486 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 487 { 488 struct nameidata nd; 489 #ifdef INET 490 struct in_addr *ip4; 491 #endif 492 #ifdef INET6 493 struct in6_addr *ip6; 494 #endif 495 struct vfsopt *opt; 496 struct vfsoptlist *opts; 497 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 498 struct vnode *root; 499 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 500 char *g_path, *osrelstr; 501 #if defined(INET) || defined(INET6) 502 struct prison *tppr; 503 void *op; 504 #endif 505 unsigned long hid; 506 size_t namelen, onamelen, pnamelen; 507 int born, created, cuflags, descend, enforce; 508 int error, errmsg_len, errmsg_pos; 509 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 510 int fi, jid, jsys, len, level; 511 int childmax, osreldt, rsnum, slevel; 512 int fullpath_disabled; 513 #if defined(INET) || defined(INET6) 514 int ii, ij; 515 #endif 516 #ifdef INET 517 int ip4s, redo_ip4; 518 #endif 519 #ifdef INET6 520 int ip6s, redo_ip6; 521 #endif 522 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 523 unsigned tallow; 524 char numbuf[12]; 525 526 error = priv_check(td, PRIV_JAIL_SET); 527 if (!error && (flags & JAIL_ATTACH)) 528 error = priv_check(td, PRIV_JAIL_ATTACH); 529 if (error) 530 return (error); 531 mypr = td->td_ucred->cr_prison; 532 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 533 return (EPERM); 534 if (flags & ~JAIL_SET_MASK) 535 return (EINVAL); 536 537 /* 538 * Check all the parameters before committing to anything. Not all 539 * errors can be caught early, but we may as well try. Also, this 540 * takes care of some expensive stuff (path lookup) before getting 541 * the allprison lock. 542 * 543 * XXX Jails are not filesystems, and jail parameters are not mount 544 * options. But it makes more sense to re-use the vfsopt code 545 * than duplicate it under a different name. 546 */ 547 error = vfs_buildopts(optuio, &opts); 548 if (error) 549 return (error); 550 #ifdef INET 551 ip4 = NULL; 552 #endif 553 #ifdef INET6 554 ip6 = NULL; 555 #endif 556 g_path = NULL; 557 558 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 559 if (!cuflags) { 560 error = EINVAL; 561 vfs_opterror(opts, "no valid operation (create or update)"); 562 goto done_errmsg; 563 } 564 565 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 566 if (error == ENOENT) 567 jid = 0; 568 else if (error != 0) 569 goto done_free; 570 571 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 572 if (error == ENOENT) 573 gotslevel = 0; 574 else if (error != 0) 575 goto done_free; 576 else 577 gotslevel = 1; 578 579 error = 580 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 581 if (error == ENOENT) 582 gotchildmax = 0; 583 else if (error != 0) 584 goto done_free; 585 else 586 gotchildmax = 1; 587 588 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 589 if (error == ENOENT) 590 gotenforce = 0; 591 else if (error != 0) 592 goto done_free; 593 else if (enforce < 0 || enforce > 2) { 594 error = EINVAL; 595 goto done_free; 596 } else 597 gotenforce = 1; 598 599 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 600 if (error == ENOENT) 601 gotrsnum = 0; 602 else if (error != 0) 603 goto done_free; 604 else 605 gotrsnum = 1; 606 607 pr_flags = ch_flags = 0; 608 for (fi = 0; fi < nitems(pr_flag_names); fi++) { 609 if (pr_flag_names[fi] == NULL) 610 continue; 611 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 612 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 613 } 614 ch_flags |= pr_flags; 615 for (fi = 0; fi < nitems(pr_flag_jailsys); fi++) { 616 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys, 617 sizeof(jsys)); 618 if (error == ENOENT) 619 continue; 620 if (error != 0) 621 goto done_free; 622 switch (jsys) { 623 case JAIL_SYS_DISABLE: 624 if (!pr_flag_jailsys[fi].disable) { 625 error = EINVAL; 626 goto done_free; 627 } 628 pr_flags |= pr_flag_jailsys[fi].disable; 629 break; 630 case JAIL_SYS_NEW: 631 pr_flags |= pr_flag_jailsys[fi].new; 632 break; 633 case JAIL_SYS_INHERIT: 634 break; 635 default: 636 error = EINVAL; 637 goto done_free; 638 } 639 ch_flags |= 640 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable; 641 } 642 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 643 && !(pr_flags & PR_PERSIST)) { 644 error = EINVAL; 645 vfs_opterror(opts, "new jail must persist or attach"); 646 goto done_errmsg; 647 } 648 #ifdef VIMAGE 649 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 650 error = EINVAL; 651 vfs_opterror(opts, "vnet cannot be changed after creation"); 652 goto done_errmsg; 653 } 654 #endif 655 #ifdef INET 656 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 657 error = EINVAL; 658 vfs_opterror(opts, "ip4 cannot be changed after creation"); 659 goto done_errmsg; 660 } 661 #endif 662 #ifdef INET6 663 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 664 error = EINVAL; 665 vfs_opterror(opts, "ip6 cannot be changed after creation"); 666 goto done_errmsg; 667 } 668 #endif 669 670 pr_allow = ch_allow = 0; 671 for (fi = 0; fi < nitems(pr_allow_names); fi++) { 672 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 673 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 674 } 675 ch_allow |= pr_allow; 676 677 error = vfs_getopt(opts, "name", (void **)&name, &len); 678 if (error == ENOENT) 679 name = NULL; 680 else if (error != 0) 681 goto done_free; 682 else { 683 if (len == 0 || name[len - 1] != '\0') { 684 error = EINVAL; 685 goto done_free; 686 } 687 if (len > MAXHOSTNAMELEN) { 688 error = ENAMETOOLONG; 689 goto done_free; 690 } 691 } 692 693 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 694 if (error == ENOENT) 695 host = NULL; 696 else if (error != 0) 697 goto done_free; 698 else { 699 ch_flags |= PR_HOST; 700 pr_flags |= PR_HOST; 701 if (len == 0 || host[len - 1] != '\0') { 702 error = EINVAL; 703 goto done_free; 704 } 705 if (len > MAXHOSTNAMELEN) { 706 error = ENAMETOOLONG; 707 goto done_free; 708 } 709 } 710 711 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 712 if (error == ENOENT) 713 domain = NULL; 714 else if (error != 0) 715 goto done_free; 716 else { 717 ch_flags |= PR_HOST; 718 pr_flags |= PR_HOST; 719 if (len == 0 || domain[len - 1] != '\0') { 720 error = EINVAL; 721 goto done_free; 722 } 723 if (len > MAXHOSTNAMELEN) { 724 error = ENAMETOOLONG; 725 goto done_free; 726 } 727 } 728 729 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 730 if (error == ENOENT) 731 uuid = NULL; 732 else if (error != 0) 733 goto done_free; 734 else { 735 ch_flags |= PR_HOST; 736 pr_flags |= PR_HOST; 737 if (len == 0 || uuid[len - 1] != '\0') { 738 error = EINVAL; 739 goto done_free; 740 } 741 if (len > HOSTUUIDLEN) { 742 error = ENAMETOOLONG; 743 goto done_free; 744 } 745 } 746 747 #ifdef COMPAT_FREEBSD32 748 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 749 uint32_t hid32; 750 751 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 752 hid = hid32; 753 } else 754 #endif 755 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 756 if (error == ENOENT) 757 gothid = 0; 758 else if (error != 0) 759 goto done_free; 760 else { 761 gothid = 1; 762 ch_flags |= PR_HOST; 763 pr_flags |= PR_HOST; 764 } 765 766 #ifdef INET 767 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 768 if (error == ENOENT) 769 ip4s = 0; 770 else if (error != 0) 771 goto done_free; 772 else if (ip4s & (sizeof(*ip4) - 1)) { 773 error = EINVAL; 774 goto done_free; 775 } else { 776 ch_flags |= PR_IP4_USER; 777 pr_flags |= PR_IP4_USER; 778 if (ip4s > 0) { 779 ip4s /= sizeof(*ip4); 780 if (ip4s > jail_max_af_ips) { 781 error = EINVAL; 782 vfs_opterror(opts, "too many IPv4 addresses"); 783 goto done_errmsg; 784 } 785 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 786 bcopy(op, ip4, ip4s * sizeof(*ip4)); 787 /* 788 * IP addresses are all sorted but ip[0] to preserve 789 * the primary IP address as given from userland. 790 * This special IP is used for unbound outgoing 791 * connections as well for "loopback" traffic in case 792 * source address selection cannot find any more fitting 793 * address to connect from. 794 */ 795 if (ip4s > 1) 796 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), 797 prison_qcmp_v4); 798 /* 799 * Check for duplicate addresses and do some simple 800 * zero and broadcast checks. If users give other bogus 801 * addresses it is their problem. 802 * 803 * We do not have to care about byte order for these 804 * checks so we will do them in NBO. 805 */ 806 for (ii = 0; ii < ip4s; ii++) { 807 if (ip4[ii].s_addr == INADDR_ANY || 808 ip4[ii].s_addr == INADDR_BROADCAST) { 809 error = EINVAL; 810 goto done_free; 811 } 812 if ((ii+1) < ip4s && 813 (ip4[0].s_addr == ip4[ii+1].s_addr || 814 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 815 error = EINVAL; 816 goto done_free; 817 } 818 } 819 } 820 } 821 #endif 822 823 #ifdef INET6 824 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 825 if (error == ENOENT) 826 ip6s = 0; 827 else if (error != 0) 828 goto done_free; 829 else if (ip6s & (sizeof(*ip6) - 1)) { 830 error = EINVAL; 831 goto done_free; 832 } else { 833 ch_flags |= PR_IP6_USER; 834 pr_flags |= PR_IP6_USER; 835 if (ip6s > 0) { 836 ip6s /= sizeof(*ip6); 837 if (ip6s > jail_max_af_ips) { 838 error = EINVAL; 839 vfs_opterror(opts, "too many IPv6 addresses"); 840 goto done_errmsg; 841 } 842 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 843 bcopy(op, ip6, ip6s * sizeof(*ip6)); 844 if (ip6s > 1) 845 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), 846 prison_qcmp_v6); 847 for (ii = 0; ii < ip6s; ii++) { 848 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 849 error = EINVAL; 850 goto done_free; 851 } 852 if ((ii+1) < ip6s && 853 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 854 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 855 { 856 error = EINVAL; 857 goto done_free; 858 } 859 } 860 } 861 } 862 #endif 863 864 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 865 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 866 error = EINVAL; 867 vfs_opterror(opts, 868 "vnet jails cannot have IP address restrictions"); 869 goto done_errmsg; 870 } 871 #endif 872 873 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 874 if (error == ENOENT) 875 osrelstr = NULL; 876 else if (error != 0) 877 goto done_free; 878 else { 879 if (flags & JAIL_UPDATE) { 880 error = EINVAL; 881 vfs_opterror(opts, 882 "osrelease cannot be changed after creation"); 883 goto done_errmsg; 884 } 885 if (len == 0 || len >= OSRELEASELEN) { 886 error = EINVAL; 887 vfs_opterror(opts, 888 "osrelease string must be 1-%d bytes long", 889 OSRELEASELEN - 1); 890 goto done_errmsg; 891 } 892 } 893 894 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 895 if (error == ENOENT) 896 osreldt = 0; 897 else if (error != 0) 898 goto done_free; 899 else { 900 if (flags & JAIL_UPDATE) { 901 error = EINVAL; 902 vfs_opterror(opts, 903 "osreldate cannot be changed after creation"); 904 goto done_errmsg; 905 } 906 if (osreldt == 0) { 907 error = EINVAL; 908 vfs_opterror(opts, "osreldate cannot be 0"); 909 goto done_errmsg; 910 } 911 } 912 913 fullpath_disabled = 0; 914 root = NULL; 915 error = vfs_getopt(opts, "path", (void **)&path, &len); 916 if (error == ENOENT) 917 path = NULL; 918 else if (error != 0) 919 goto done_free; 920 else { 921 if (flags & JAIL_UPDATE) { 922 error = EINVAL; 923 vfs_opterror(opts, 924 "path cannot be changed after creation"); 925 goto done_errmsg; 926 } 927 if (len == 0 || path[len - 1] != '\0') { 928 error = EINVAL; 929 goto done_free; 930 } 931 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 932 path, td); 933 error = namei(&nd); 934 if (error) 935 goto done_free; 936 root = nd.ni_vp; 937 NDFREE(&nd, NDF_ONLY_PNBUF); 938 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 939 strlcpy(g_path, path, MAXPATHLEN); 940 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 941 if (error == 0) 942 path = g_path; 943 else if (error == ENODEV) { 944 /* proceed if sysctl debug.disablefullpath == 1 */ 945 fullpath_disabled = 1; 946 if (len < 2 || (len == 2 && path[0] == '/')) 947 path = NULL; 948 } else { 949 /* exit on other errors */ 950 goto done_free; 951 } 952 if (root->v_type != VDIR) { 953 error = ENOTDIR; 954 vput(root); 955 goto done_free; 956 } 957 VOP_UNLOCK(root, 0); 958 if (fullpath_disabled) { 959 /* Leave room for a real-root full pathname. */ 960 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 961 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 962 error = ENAMETOOLONG; 963 vrele(root); 964 goto done_free; 965 } 966 } 967 } 968 969 /* 970 * Find the specified jail, or at least its parent. 971 * This abuses the file error codes ENOENT and EEXIST. 972 */ 973 pr = NULL; 974 ppr = mypr; 975 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 976 namelc = strrchr(name, '.'); 977 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 978 if (*p != '\0') 979 jid = 0; 980 } 981 sx_xlock(&allprison_lock); 982 if (jid != 0) { 983 /* 984 * See if a requested jid already exists. There is an 985 * information leak here if the jid exists but is not within 986 * the caller's jail hierarchy. Jail creators will get EEXIST 987 * even though they cannot see the jail, and CREATE | UPDATE 988 * will return ENOENT which is not normally a valid error. 989 */ 990 if (jid < 0) { 991 error = EINVAL; 992 vfs_opterror(opts, "negative jid"); 993 goto done_unlock_list; 994 } 995 pr = prison_find(jid); 996 if (pr != NULL) { 997 ppr = pr->pr_parent; 998 /* Create: jid must not exist. */ 999 if (cuflags == JAIL_CREATE) { 1000 mtx_unlock(&pr->pr_mtx); 1001 error = EEXIST; 1002 vfs_opterror(opts, "jail %d already exists", 1003 jid); 1004 goto done_unlock_list; 1005 } 1006 if (!prison_ischild(mypr, pr)) { 1007 mtx_unlock(&pr->pr_mtx); 1008 pr = NULL; 1009 } else if (pr->pr_uref == 0) { 1010 if (!(flags & JAIL_DYING)) { 1011 mtx_unlock(&pr->pr_mtx); 1012 error = ENOENT; 1013 vfs_opterror(opts, "jail %d is dying", 1014 jid); 1015 goto done_unlock_list; 1016 } else if ((flags & JAIL_ATTACH) || 1017 (pr_flags & PR_PERSIST)) { 1018 /* 1019 * A dying jail might be resurrected 1020 * (via attach or persist), but first 1021 * it must determine if another jail 1022 * has claimed its name. Accomplish 1023 * this by implicitly re-setting the 1024 * name. 1025 */ 1026 if (name == NULL) 1027 name = prison_name(mypr, pr); 1028 } 1029 } 1030 } 1031 if (pr == NULL) { 1032 /* Update: jid must exist. */ 1033 if (cuflags == JAIL_UPDATE) { 1034 error = ENOENT; 1035 vfs_opterror(opts, "jail %d not found", jid); 1036 goto done_unlock_list; 1037 } 1038 } 1039 } 1040 /* 1041 * If the caller provided a name, look for a jail by that name. 1042 * This has different semantics for creates and updates keyed by jid 1043 * (where the name must not already exist in a different jail), 1044 * and updates keyed by the name itself (where the name must exist 1045 * because that is the jail being updated). 1046 */ 1047 namelc = NULL; 1048 if (name != NULL) { 1049 namelc = strrchr(name, '.'); 1050 if (namelc == NULL) 1051 namelc = name; 1052 else { 1053 /* 1054 * This is a hierarchical name. Split it into the 1055 * parent and child names, and make sure the parent 1056 * exists or matches an already found jail. 1057 */ 1058 if (pr != NULL) { 1059 if (strncmp(name, ppr->pr_name, namelc - name) 1060 || ppr->pr_name[namelc - name] != '\0') { 1061 mtx_unlock(&pr->pr_mtx); 1062 error = EINVAL; 1063 vfs_opterror(opts, 1064 "cannot change jail's parent"); 1065 goto done_unlock_list; 1066 } 1067 } else { 1068 *namelc = '\0'; 1069 ppr = prison_find_name(mypr, name); 1070 if (ppr == NULL) { 1071 error = ENOENT; 1072 vfs_opterror(opts, 1073 "jail \"%s\" not found", name); 1074 goto done_unlock_list; 1075 } 1076 mtx_unlock(&ppr->pr_mtx); 1077 *namelc = '.'; 1078 } 1079 namelc++; 1080 } 1081 if (namelc[0] != '\0') { 1082 pnamelen = 1083 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1084 name_again: 1085 deadpr = NULL; 1086 FOREACH_PRISON_CHILD(ppr, tpr) { 1087 if (tpr != pr && tpr->pr_ref > 0 && 1088 !strcmp(tpr->pr_name + pnamelen, namelc)) { 1089 if (pr == NULL && 1090 cuflags != JAIL_CREATE) { 1091 mtx_lock(&tpr->pr_mtx); 1092 if (tpr->pr_ref > 0) { 1093 /* 1094 * Use this jail 1095 * for updates. 1096 */ 1097 if (tpr->pr_uref > 0) { 1098 pr = tpr; 1099 break; 1100 } 1101 deadpr = tpr; 1102 } 1103 mtx_unlock(&tpr->pr_mtx); 1104 } else if (tpr->pr_uref > 0) { 1105 /* 1106 * Create, or update(jid): 1107 * name must not exist in an 1108 * active sibling jail. 1109 */ 1110 error = EEXIST; 1111 if (pr != NULL) 1112 mtx_unlock(&pr->pr_mtx); 1113 vfs_opterror(opts, 1114 "jail \"%s\" already exists", 1115 name); 1116 goto done_unlock_list; 1117 } 1118 } 1119 } 1120 /* If no active jail is found, use a dying one. */ 1121 if (deadpr != NULL && pr == NULL) { 1122 if (flags & JAIL_DYING) { 1123 mtx_lock(&deadpr->pr_mtx); 1124 if (deadpr->pr_ref == 0) { 1125 mtx_unlock(&deadpr->pr_mtx); 1126 goto name_again; 1127 } 1128 pr = deadpr; 1129 } else if (cuflags == JAIL_UPDATE) { 1130 error = ENOENT; 1131 vfs_opterror(opts, 1132 "jail \"%s\" is dying", name); 1133 goto done_unlock_list; 1134 } 1135 } 1136 /* Update: name must exist if no jid. */ 1137 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1138 error = ENOENT; 1139 vfs_opterror(opts, "jail \"%s\" not found", 1140 name); 1141 goto done_unlock_list; 1142 } 1143 } 1144 } 1145 /* Update: must provide a jid or name. */ 1146 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1147 error = ENOENT; 1148 vfs_opterror(opts, "update specified no jail"); 1149 goto done_unlock_list; 1150 } 1151 1152 /* If there's no prison to update, create a new one and link it in. */ 1153 if (pr == NULL) { 1154 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1155 if (tpr->pr_childcount >= tpr->pr_childmax) { 1156 error = EPERM; 1157 vfs_opterror(opts, "prison limit exceeded"); 1158 goto done_unlock_list; 1159 } 1160 created = 1; 1161 mtx_lock(&ppr->pr_mtx); 1162 if (ppr->pr_ref == 0) { 1163 mtx_unlock(&ppr->pr_mtx); 1164 error = ENOENT; 1165 vfs_opterror(opts, "jail \"%s\" not found", 1166 prison_name(mypr, ppr)); 1167 goto done_unlock_list; 1168 } 1169 ppr->pr_ref++; 1170 ppr->pr_uref++; 1171 mtx_unlock(&ppr->pr_mtx); 1172 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1173 if (jid == 0) { 1174 /* Find the next free jid. */ 1175 jid = lastprid + 1; 1176 findnext: 1177 if (jid == JAIL_MAX) 1178 jid = 1; 1179 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1180 if (tpr->pr_id < jid) 1181 continue; 1182 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1183 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1184 break; 1185 } 1186 if (jid == lastprid) { 1187 error = EAGAIN; 1188 vfs_opterror(opts, 1189 "no available jail IDs"); 1190 free(pr, M_PRISON); 1191 prison_deref(ppr, PD_DEREF | 1192 PD_DEUREF | PD_LIST_XLOCKED); 1193 goto done_releroot; 1194 } 1195 jid++; 1196 goto findnext; 1197 } 1198 lastprid = jid; 1199 } else { 1200 /* 1201 * The jail already has a jid (that did not yet exist), 1202 * so just find where to insert it. 1203 */ 1204 TAILQ_FOREACH(tpr, &allprison, pr_list) 1205 if (tpr->pr_id >= jid) { 1206 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1207 break; 1208 } 1209 } 1210 if (tpr == NULL) 1211 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1212 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1213 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1214 tpr->pr_childcount++; 1215 1216 pr->pr_parent = ppr; 1217 pr->pr_id = jid; 1218 1219 /* Set some default values, and inherit some from the parent. */ 1220 if (namelc == NULL) 1221 namelc = ""; 1222 if (path == NULL) { 1223 path = "/"; 1224 root = mypr->pr_root; 1225 vref(root); 1226 } 1227 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1228 pr->pr_flags |= PR_HOST; 1229 #if defined(INET) || defined(INET6) 1230 #ifdef VIMAGE 1231 if (!(pr_flags & PR_VNET)) 1232 #endif 1233 { 1234 #ifdef INET 1235 if (!(ch_flags & PR_IP4_USER)) 1236 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1237 else if (!(pr_flags & PR_IP4_USER)) { 1238 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1239 if (ppr->pr_ip4 != NULL) { 1240 pr->pr_ip4s = ppr->pr_ip4s; 1241 pr->pr_ip4 = malloc(pr->pr_ip4s * 1242 sizeof(struct in_addr), M_PRISON, 1243 M_WAITOK); 1244 bcopy(ppr->pr_ip4, pr->pr_ip4, 1245 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1246 } 1247 } 1248 #endif 1249 #ifdef INET6 1250 if (!(ch_flags & PR_IP6_USER)) 1251 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1252 else if (!(pr_flags & PR_IP6_USER)) { 1253 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1254 if (ppr->pr_ip6 != NULL) { 1255 pr->pr_ip6s = ppr->pr_ip6s; 1256 pr->pr_ip6 = malloc(pr->pr_ip6s * 1257 sizeof(struct in6_addr), M_PRISON, 1258 M_WAITOK); 1259 bcopy(ppr->pr_ip6, pr->pr_ip6, 1260 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1261 } 1262 } 1263 #endif 1264 } 1265 #endif 1266 /* Source address selection is always on by default. */ 1267 pr->pr_flags |= _PR_IP_SADDRSEL; 1268 1269 pr->pr_securelevel = ppr->pr_securelevel; 1270 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1271 pr->pr_enforce_statfs = jail_default_enforce_statfs; 1272 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1273 1274 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1275 if (osrelstr == NULL) 1276 strcpy(pr->pr_osrelease, ppr->pr_osrelease); 1277 else 1278 strcpy(pr->pr_osrelease, osrelstr); 1279 1280 LIST_INIT(&pr->pr_children); 1281 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1282 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1283 1284 #ifdef VIMAGE 1285 /* Allocate a new vnet if specified. */ 1286 pr->pr_vnet = (pr_flags & PR_VNET) 1287 ? vnet_alloc() : ppr->pr_vnet; 1288 #endif 1289 /* 1290 * Allocate a dedicated cpuset for each jail. 1291 * Unlike other initial settings, this may return an erorr. 1292 */ 1293 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1294 if (error) { 1295 prison_deref(pr, PD_LIST_XLOCKED); 1296 goto done_releroot; 1297 } 1298 1299 mtx_lock(&pr->pr_mtx); 1300 /* 1301 * New prisons do not yet have a reference, because we do not 1302 * want others to see the incomplete prison once the 1303 * allprison_lock is downgraded. 1304 */ 1305 } else { 1306 created = 0; 1307 /* 1308 * Grab a reference for existing prisons, to ensure they 1309 * continue to exist for the duration of the call. 1310 */ 1311 pr->pr_ref++; 1312 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1313 if ((pr->pr_flags & PR_VNET) && 1314 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1315 error = EINVAL; 1316 vfs_opterror(opts, 1317 "vnet jails cannot have IP address restrictions"); 1318 goto done_deref_locked; 1319 } 1320 #endif 1321 #ifdef INET 1322 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1323 error = EINVAL; 1324 vfs_opterror(opts, 1325 "ip4 cannot be changed after creation"); 1326 goto done_deref_locked; 1327 } 1328 #endif 1329 #ifdef INET6 1330 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1331 error = EINVAL; 1332 vfs_opterror(opts, 1333 "ip6 cannot be changed after creation"); 1334 goto done_deref_locked; 1335 } 1336 #endif 1337 } 1338 1339 /* Do final error checking before setting anything. */ 1340 if (gotslevel) { 1341 if (slevel < ppr->pr_securelevel) { 1342 error = EPERM; 1343 goto done_deref_locked; 1344 } 1345 } 1346 if (gotchildmax) { 1347 if (childmax >= ppr->pr_childmax) { 1348 error = EPERM; 1349 goto done_deref_locked; 1350 } 1351 } 1352 if (gotenforce) { 1353 if (enforce < ppr->pr_enforce_statfs) { 1354 error = EPERM; 1355 goto done_deref_locked; 1356 } 1357 } 1358 if (gotrsnum) { 1359 /* 1360 * devfs_rsnum is a uint16_t 1361 */ 1362 if (rsnum < 0 || rsnum > 65535) { 1363 error = EINVAL; 1364 goto done_deref_locked; 1365 } 1366 /* 1367 * Nested jails always inherit parent's devfs ruleset 1368 */ 1369 if (jailed(td->td_ucred)) { 1370 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1371 error = EPERM; 1372 goto done_deref_locked; 1373 } else 1374 rsnum = ppr->pr_devfs_rsnum; 1375 } 1376 } 1377 #ifdef INET 1378 if (ip4s > 0) { 1379 if (ppr->pr_flags & PR_IP4) { 1380 /* 1381 * Make sure the new set of IP addresses is a 1382 * subset of the parent's list. Don't worry 1383 * about the parent being unlocked, as any 1384 * setting is done with allprison_lock held. 1385 */ 1386 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1387 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1388 break; 1389 if (ij == ppr->pr_ip4s) { 1390 error = EPERM; 1391 goto done_deref_locked; 1392 } 1393 if (ip4s > 1) { 1394 for (ii = ij = 1; ii < ip4s; ii++) { 1395 if (ip4[ii].s_addr == 1396 ppr->pr_ip4[0].s_addr) 1397 continue; 1398 for (; ij < ppr->pr_ip4s; ij++) 1399 if (ip4[ii].s_addr == 1400 ppr->pr_ip4[ij].s_addr) 1401 break; 1402 if (ij == ppr->pr_ip4s) 1403 break; 1404 } 1405 if (ij == ppr->pr_ip4s) { 1406 error = EPERM; 1407 goto done_deref_locked; 1408 } 1409 } 1410 } 1411 /* 1412 * Check for conflicting IP addresses. We permit them 1413 * if there is no more than one IP on each jail. If 1414 * there is a duplicate on a jail with more than one 1415 * IP stop checking and return error. 1416 */ 1417 tppr = ppr; 1418 #ifdef VIMAGE 1419 for (; tppr != &prison0; tppr = tppr->pr_parent) 1420 if (tppr->pr_flags & PR_VNET) 1421 break; 1422 #endif 1423 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1424 if (tpr == pr || 1425 #ifdef VIMAGE 1426 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1427 #endif 1428 tpr->pr_uref == 0) { 1429 descend = 0; 1430 continue; 1431 } 1432 if (!(tpr->pr_flags & PR_IP4_USER)) 1433 continue; 1434 descend = 0; 1435 if (tpr->pr_ip4 == NULL || 1436 (ip4s == 1 && tpr->pr_ip4s == 1)) 1437 continue; 1438 for (ii = 0; ii < ip4s; ii++) { 1439 if (prison_check_ip4_locked(tpr, &ip4[ii]) == 1440 0) { 1441 error = EADDRINUSE; 1442 vfs_opterror(opts, 1443 "IPv4 addresses clash"); 1444 goto done_deref_locked; 1445 } 1446 } 1447 } 1448 } 1449 #endif 1450 #ifdef INET6 1451 if (ip6s > 0) { 1452 if (ppr->pr_flags & PR_IP6) { 1453 /* 1454 * Make sure the new set of IP addresses is a 1455 * subset of the parent's list. 1456 */ 1457 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1458 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1459 &ppr->pr_ip6[ij])) 1460 break; 1461 if (ij == ppr->pr_ip6s) { 1462 error = EPERM; 1463 goto done_deref_locked; 1464 } 1465 if (ip6s > 1) { 1466 for (ii = ij = 1; ii < ip6s; ii++) { 1467 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1468 &ppr->pr_ip6[0])) 1469 continue; 1470 for (; ij < ppr->pr_ip6s; ij++) 1471 if (IN6_ARE_ADDR_EQUAL( 1472 &ip6[ii], &ppr->pr_ip6[ij])) 1473 break; 1474 if (ij == ppr->pr_ip6s) 1475 break; 1476 } 1477 if (ij == ppr->pr_ip6s) { 1478 error = EPERM; 1479 goto done_deref_locked; 1480 } 1481 } 1482 } 1483 /* Check for conflicting IP addresses. */ 1484 tppr = ppr; 1485 #ifdef VIMAGE 1486 for (; tppr != &prison0; tppr = tppr->pr_parent) 1487 if (tppr->pr_flags & PR_VNET) 1488 break; 1489 #endif 1490 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1491 if (tpr == pr || 1492 #ifdef VIMAGE 1493 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1494 #endif 1495 tpr->pr_uref == 0) { 1496 descend = 0; 1497 continue; 1498 } 1499 if (!(tpr->pr_flags & PR_IP6_USER)) 1500 continue; 1501 descend = 0; 1502 if (tpr->pr_ip6 == NULL || 1503 (ip6s == 1 && tpr->pr_ip6s == 1)) 1504 continue; 1505 for (ii = 0; ii < ip6s; ii++) { 1506 if (prison_check_ip6_locked(tpr, &ip6[ii]) == 1507 0) { 1508 error = EADDRINUSE; 1509 vfs_opterror(opts, 1510 "IPv6 addresses clash"); 1511 goto done_deref_locked; 1512 } 1513 } 1514 } 1515 } 1516 #endif 1517 onamelen = namelen = 0; 1518 if (namelc != NULL) { 1519 /* Give a default name of the jid. Also allow the name to be 1520 * explicitly the jid - but not any other number, and only in 1521 * normal form (no leading zero/etc). 1522 */ 1523 if (namelc[0] == '\0') 1524 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 1525 else if ((strtoul(namelc, &p, 10) != jid || 1526 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1527 error = EINVAL; 1528 vfs_opterror(opts, 1529 "name cannot be numeric (unless it is the jid)"); 1530 goto done_deref_locked; 1531 } 1532 /* 1533 * Make sure the name isn't too long for the prison or its 1534 * children. 1535 */ 1536 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1537 onamelen = strlen(pr->pr_name + pnamelen); 1538 namelen = strlen(namelc); 1539 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1540 error = ENAMETOOLONG; 1541 goto done_deref_locked; 1542 } 1543 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1544 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1545 sizeof(pr->pr_name)) { 1546 error = ENAMETOOLONG; 1547 goto done_deref_locked; 1548 } 1549 } 1550 } 1551 if (pr_allow & ~ppr->pr_allow) { 1552 error = EPERM; 1553 goto done_deref_locked; 1554 } 1555 1556 /* 1557 * Let modules check their parameters. This requires unlocking and 1558 * then re-locking the prison, but this is still a valid state as long 1559 * as allprison_lock remains xlocked. 1560 */ 1561 mtx_unlock(&pr->pr_mtx); 1562 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1563 if (error != 0) { 1564 prison_deref(pr, created 1565 ? PD_LIST_XLOCKED 1566 : PD_DEREF | PD_LIST_XLOCKED); 1567 goto done_releroot; 1568 } 1569 mtx_lock(&pr->pr_mtx); 1570 1571 /* At this point, all valid parameters should have been noted. */ 1572 TAILQ_FOREACH(opt, opts, link) { 1573 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1574 error = EINVAL; 1575 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1576 goto done_deref_locked; 1577 } 1578 } 1579 1580 /* Set the parameters of the prison. */ 1581 #ifdef INET 1582 redo_ip4 = 0; 1583 if (pr_flags & PR_IP4_USER) { 1584 pr->pr_flags |= PR_IP4; 1585 free(pr->pr_ip4, M_PRISON); 1586 pr->pr_ip4s = ip4s; 1587 pr->pr_ip4 = ip4; 1588 ip4 = NULL; 1589 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1590 #ifdef VIMAGE 1591 if (tpr->pr_flags & PR_VNET) { 1592 descend = 0; 1593 continue; 1594 } 1595 #endif 1596 if (prison_restrict_ip4(tpr, NULL)) { 1597 redo_ip4 = 1; 1598 descend = 0; 1599 } 1600 } 1601 } 1602 #endif 1603 #ifdef INET6 1604 redo_ip6 = 0; 1605 if (pr_flags & PR_IP6_USER) { 1606 pr->pr_flags |= PR_IP6; 1607 free(pr->pr_ip6, M_PRISON); 1608 pr->pr_ip6s = ip6s; 1609 pr->pr_ip6 = ip6; 1610 ip6 = NULL; 1611 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1612 #ifdef VIMAGE 1613 if (tpr->pr_flags & PR_VNET) { 1614 descend = 0; 1615 continue; 1616 } 1617 #endif 1618 if (prison_restrict_ip6(tpr, NULL)) { 1619 redo_ip6 = 1; 1620 descend = 0; 1621 } 1622 } 1623 } 1624 #endif 1625 if (gotslevel) { 1626 pr->pr_securelevel = slevel; 1627 /* Set all child jails to be at least this level. */ 1628 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1629 if (tpr->pr_securelevel < slevel) 1630 tpr->pr_securelevel = slevel; 1631 } 1632 if (gotchildmax) { 1633 pr->pr_childmax = childmax; 1634 /* Set all child jails to under this limit. */ 1635 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1636 if (tpr->pr_childmax > childmax - level) 1637 tpr->pr_childmax = childmax > level 1638 ? childmax - level : 0; 1639 } 1640 if (gotenforce) { 1641 pr->pr_enforce_statfs = enforce; 1642 /* Pass this restriction on to the children. */ 1643 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1644 if (tpr->pr_enforce_statfs < enforce) 1645 tpr->pr_enforce_statfs = enforce; 1646 } 1647 if (gotrsnum) { 1648 pr->pr_devfs_rsnum = rsnum; 1649 /* Pass this restriction on to the children. */ 1650 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1651 tpr->pr_devfs_rsnum = rsnum; 1652 } 1653 if (namelc != NULL) { 1654 if (ppr == &prison0) 1655 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1656 else 1657 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1658 ppr->pr_name, namelc); 1659 /* Change this component of child names. */ 1660 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1661 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1662 strlen(tpr->pr_name + onamelen) + 1); 1663 bcopy(pr->pr_name, tpr->pr_name, namelen); 1664 } 1665 } 1666 if (path != NULL) { 1667 /* Try to keep a real-rooted full pathname. */ 1668 if (fullpath_disabled && path[0] == '/' && 1669 strcmp(mypr->pr_path, "/")) 1670 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1671 mypr->pr_path, path); 1672 else 1673 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1674 pr->pr_root = root; 1675 } 1676 if (PR_HOST & ch_flags & ~pr_flags) { 1677 if (pr->pr_flags & PR_HOST) { 1678 /* 1679 * Copy the parent's host info. As with pr_ip4 above, 1680 * the lack of a lock on the parent is not a problem; 1681 * it is always set with allprison_lock at least 1682 * shared, and is held exclusively here. 1683 */ 1684 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1685 sizeof(pr->pr_hostname)); 1686 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1687 sizeof(pr->pr_domainname)); 1688 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1689 sizeof(pr->pr_hostuuid)); 1690 pr->pr_hostid = pr->pr_parent->pr_hostid; 1691 } 1692 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1693 /* Set this prison, and any descendants without PR_HOST. */ 1694 if (host != NULL) 1695 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1696 if (domain != NULL) 1697 strlcpy(pr->pr_domainname, domain, 1698 sizeof(pr->pr_domainname)); 1699 if (uuid != NULL) 1700 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1701 if (gothid) 1702 pr->pr_hostid = hid; 1703 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1704 if (tpr->pr_flags & PR_HOST) 1705 descend = 0; 1706 else { 1707 if (host != NULL) 1708 strlcpy(tpr->pr_hostname, 1709 pr->pr_hostname, 1710 sizeof(tpr->pr_hostname)); 1711 if (domain != NULL) 1712 strlcpy(tpr->pr_domainname, 1713 pr->pr_domainname, 1714 sizeof(tpr->pr_domainname)); 1715 if (uuid != NULL) 1716 strlcpy(tpr->pr_hostuuid, 1717 pr->pr_hostuuid, 1718 sizeof(tpr->pr_hostuuid)); 1719 if (gothid) 1720 tpr->pr_hostid = hid; 1721 } 1722 } 1723 } 1724 if ((tallow = ch_allow & ~pr_allow)) { 1725 /* Clear allow bits in all children. */ 1726 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1727 tpr->pr_allow &= ~tallow; 1728 } 1729 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1730 /* 1731 * Persistent prisons get an extra reference, and prisons losing their 1732 * persist flag lose that reference. Only do this for existing prisons 1733 * for now, so new ones will remain unseen until after the module 1734 * handlers have completed. 1735 */ 1736 born = pr->pr_uref == 0; 1737 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1738 if (pr_flags & PR_PERSIST) { 1739 pr->pr_ref++; 1740 pr->pr_uref++; 1741 } else { 1742 pr->pr_ref--; 1743 pr->pr_uref--; 1744 } 1745 } 1746 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1747 mtx_unlock(&pr->pr_mtx); 1748 1749 #ifdef RACCT 1750 if (racct_enable && created) 1751 prison_racct_attach(pr); 1752 #endif 1753 1754 /* Locks may have prevented a complete restriction of child IP 1755 * addresses. If so, allocate some more memory and try again. 1756 */ 1757 #ifdef INET 1758 while (redo_ip4) { 1759 ip4s = pr->pr_ip4s; 1760 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1761 mtx_lock(&pr->pr_mtx); 1762 redo_ip4 = 0; 1763 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1764 #ifdef VIMAGE 1765 if (tpr->pr_flags & PR_VNET) { 1766 descend = 0; 1767 continue; 1768 } 1769 #endif 1770 if (prison_restrict_ip4(tpr, ip4)) { 1771 if (ip4 != NULL) 1772 ip4 = NULL; 1773 else 1774 redo_ip4 = 1; 1775 } 1776 } 1777 mtx_unlock(&pr->pr_mtx); 1778 } 1779 #endif 1780 #ifdef INET6 1781 while (redo_ip6) { 1782 ip6s = pr->pr_ip6s; 1783 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1784 mtx_lock(&pr->pr_mtx); 1785 redo_ip6 = 0; 1786 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1787 #ifdef VIMAGE 1788 if (tpr->pr_flags & PR_VNET) { 1789 descend = 0; 1790 continue; 1791 } 1792 #endif 1793 if (prison_restrict_ip6(tpr, ip6)) { 1794 if (ip6 != NULL) 1795 ip6 = NULL; 1796 else 1797 redo_ip6 = 1; 1798 } 1799 } 1800 mtx_unlock(&pr->pr_mtx); 1801 } 1802 #endif 1803 1804 /* Let the modules do their work. */ 1805 sx_downgrade(&allprison_lock); 1806 if (born) { 1807 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1808 if (error) { 1809 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1810 prison_deref(pr, created 1811 ? PD_LIST_SLOCKED 1812 : PD_DEREF | PD_LIST_SLOCKED); 1813 goto done_errmsg; 1814 } 1815 } 1816 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1817 if (error) { 1818 if (born) 1819 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1820 prison_deref(pr, created 1821 ? PD_LIST_SLOCKED 1822 : PD_DEREF | PD_LIST_SLOCKED); 1823 goto done_errmsg; 1824 } 1825 1826 /* Attach this process to the prison if requested. */ 1827 if (flags & JAIL_ATTACH) { 1828 mtx_lock(&pr->pr_mtx); 1829 error = do_jail_attach(td, pr); 1830 if (error) { 1831 vfs_opterror(opts, "attach failed"); 1832 if (!created) 1833 prison_deref(pr, PD_DEREF); 1834 goto done_errmsg; 1835 } 1836 } 1837 1838 #ifdef RACCT 1839 if (racct_enable && !created) { 1840 if (!(flags & JAIL_ATTACH)) 1841 sx_sunlock(&allprison_lock); 1842 prison_racct_modify(pr); 1843 if (!(flags & JAIL_ATTACH)) 1844 sx_slock(&allprison_lock); 1845 } 1846 #endif 1847 1848 td->td_retval[0] = pr->pr_id; 1849 1850 /* 1851 * Now that it is all there, drop the temporary reference from existing 1852 * prisons. Or add a reference to newly created persistent prisons 1853 * (which was not done earlier so that the prison would not be publicly 1854 * visible). 1855 */ 1856 if (!created) { 1857 prison_deref(pr, (flags & JAIL_ATTACH) 1858 ? PD_DEREF 1859 : PD_DEREF | PD_LIST_SLOCKED); 1860 } else { 1861 if (pr_flags & PR_PERSIST) { 1862 mtx_lock(&pr->pr_mtx); 1863 pr->pr_ref++; 1864 pr->pr_uref++; 1865 mtx_unlock(&pr->pr_mtx); 1866 } 1867 if (!(flags & JAIL_ATTACH)) 1868 sx_sunlock(&allprison_lock); 1869 } 1870 1871 goto done_free; 1872 1873 done_deref_locked: 1874 prison_deref(pr, created 1875 ? PD_LOCKED | PD_LIST_XLOCKED 1876 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1877 goto done_releroot; 1878 done_unlock_list: 1879 sx_xunlock(&allprison_lock); 1880 done_releroot: 1881 if (root != NULL) 1882 vrele(root); 1883 done_errmsg: 1884 if (error) { 1885 if (vfs_getopt(opts, "errmsg", (void **)&errmsg, 1886 &errmsg_len) == 0 && errmsg_len > 0) { 1887 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1888 if (optuio->uio_segflg == UIO_SYSSPACE) 1889 bcopy(errmsg, 1890 optuio->uio_iov[errmsg_pos].iov_base, 1891 errmsg_len); 1892 else 1893 copyout(errmsg, 1894 optuio->uio_iov[errmsg_pos].iov_base, 1895 errmsg_len); 1896 } 1897 } 1898 done_free: 1899 #ifdef INET 1900 free(ip4, M_PRISON); 1901 #endif 1902 #ifdef INET6 1903 free(ip6, M_PRISON); 1904 #endif 1905 if (g_path != NULL) 1906 free(g_path, M_TEMP); 1907 vfs_freeopts(opts); 1908 return (error); 1909 } 1910 1911 1912 /* 1913 * struct jail_get_args { 1914 * struct iovec *iovp; 1915 * unsigned int iovcnt; 1916 * int flags; 1917 * }; 1918 */ 1919 int 1920 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1921 { 1922 struct uio *auio; 1923 int error; 1924 1925 /* Check that we have an even number of iovecs. */ 1926 if (uap->iovcnt & 1) 1927 return (EINVAL); 1928 1929 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1930 if (error) 1931 return (error); 1932 error = kern_jail_get(td, auio, uap->flags); 1933 if (error == 0) 1934 error = copyout(auio->uio_iov, uap->iovp, 1935 uap->iovcnt * sizeof (struct iovec)); 1936 free(auio, M_IOV); 1937 return (error); 1938 } 1939 1940 int 1941 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1942 { 1943 struct prison *pr, *mypr; 1944 struct vfsopt *opt; 1945 struct vfsoptlist *opts; 1946 char *errmsg, *name; 1947 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1948 1949 if (flags & ~JAIL_GET_MASK) 1950 return (EINVAL); 1951 1952 /* Get the parameter list. */ 1953 error = vfs_buildopts(optuio, &opts); 1954 if (error) 1955 return (error); 1956 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1957 mypr = td->td_ucred->cr_prison; 1958 1959 /* 1960 * Find the prison specified by one of: lastjid, jid, name. 1961 */ 1962 sx_slock(&allprison_lock); 1963 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1964 if (error == 0) { 1965 TAILQ_FOREACH(pr, &allprison, pr_list) { 1966 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1967 mtx_lock(&pr->pr_mtx); 1968 if (pr->pr_ref > 0 && 1969 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1970 break; 1971 mtx_unlock(&pr->pr_mtx); 1972 } 1973 } 1974 if (pr != NULL) 1975 goto found_prison; 1976 error = ENOENT; 1977 vfs_opterror(opts, "no jail after %d", jid); 1978 goto done_unlock_list; 1979 } else if (error != ENOENT) 1980 goto done_unlock_list; 1981 1982 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1983 if (error == 0) { 1984 if (jid != 0) { 1985 pr = prison_find_child(mypr, jid); 1986 if (pr != NULL) { 1987 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1988 mtx_unlock(&pr->pr_mtx); 1989 error = ENOENT; 1990 vfs_opterror(opts, "jail %d is dying", 1991 jid); 1992 goto done_unlock_list; 1993 } 1994 goto found_prison; 1995 } 1996 error = ENOENT; 1997 vfs_opterror(opts, "jail %d not found", jid); 1998 goto done_unlock_list; 1999 } 2000 } else if (error != ENOENT) 2001 goto done_unlock_list; 2002 2003 error = vfs_getopt(opts, "name", (void **)&name, &len); 2004 if (error == 0) { 2005 if (len == 0 || name[len - 1] != '\0') { 2006 error = EINVAL; 2007 goto done_unlock_list; 2008 } 2009 pr = prison_find_name(mypr, name); 2010 if (pr != NULL) { 2011 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2012 mtx_unlock(&pr->pr_mtx); 2013 error = ENOENT; 2014 vfs_opterror(opts, "jail \"%s\" is dying", 2015 name); 2016 goto done_unlock_list; 2017 } 2018 goto found_prison; 2019 } 2020 error = ENOENT; 2021 vfs_opterror(opts, "jail \"%s\" not found", name); 2022 goto done_unlock_list; 2023 } else if (error != ENOENT) 2024 goto done_unlock_list; 2025 2026 vfs_opterror(opts, "no jail specified"); 2027 error = ENOENT; 2028 goto done_unlock_list; 2029 2030 found_prison: 2031 /* Get the parameters of the prison. */ 2032 pr->pr_ref++; 2033 locked = PD_LOCKED; 2034 td->td_retval[0] = pr->pr_id; 2035 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2036 if (error != 0 && error != ENOENT) 2037 goto done_deref; 2038 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2039 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2040 if (error != 0 && error != ENOENT) 2041 goto done_deref; 2042 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2043 if (error != 0 && error != ENOENT) 2044 goto done_deref; 2045 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2046 sizeof(pr->pr_cpuset->cs_id)); 2047 if (error != 0 && error != ENOENT) 2048 goto done_deref; 2049 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2050 if (error != 0 && error != ENOENT) 2051 goto done_deref; 2052 #ifdef INET 2053 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2054 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2055 if (error != 0 && error != ENOENT) 2056 goto done_deref; 2057 #endif 2058 #ifdef INET6 2059 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2060 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2061 if (error != 0 && error != ENOENT) 2062 goto done_deref; 2063 #endif 2064 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2065 sizeof(pr->pr_securelevel)); 2066 if (error != 0 && error != ENOENT) 2067 goto done_deref; 2068 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2069 sizeof(pr->pr_childcount)); 2070 if (error != 0 && error != ENOENT) 2071 goto done_deref; 2072 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2073 sizeof(pr->pr_childmax)); 2074 if (error != 0 && error != ENOENT) 2075 goto done_deref; 2076 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2077 if (error != 0 && error != ENOENT) 2078 goto done_deref; 2079 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2080 if (error != 0 && error != ENOENT) 2081 goto done_deref; 2082 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2083 if (error != 0 && error != ENOENT) 2084 goto done_deref; 2085 #ifdef COMPAT_FREEBSD32 2086 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2087 uint32_t hid32 = pr->pr_hostid; 2088 2089 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2090 } else 2091 #endif 2092 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2093 sizeof(pr->pr_hostid)); 2094 if (error != 0 && error != ENOENT) 2095 goto done_deref; 2096 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2097 sizeof(pr->pr_enforce_statfs)); 2098 if (error != 0 && error != ENOENT) 2099 goto done_deref; 2100 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2101 sizeof(pr->pr_devfs_rsnum)); 2102 if (error != 0 && error != ENOENT) 2103 goto done_deref; 2104 for (fi = 0; fi < nitems(pr_flag_names); fi++) { 2105 if (pr_flag_names[fi] == NULL) 2106 continue; 2107 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 2108 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 2109 if (error != 0 && error != ENOENT) 2110 goto done_deref; 2111 i = !i; 2112 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 2113 if (error != 0 && error != ENOENT) 2114 goto done_deref; 2115 } 2116 for (fi = 0; fi < nitems(pr_flag_jailsys); fi++) { 2117 i = pr->pr_flags & 2118 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2119 i = pr_flag_jailsys[fi].disable && 2120 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2121 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2122 : JAIL_SYS_INHERIT; 2123 error = 2124 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2125 if (error != 0 && error != ENOENT) 2126 goto done_deref; 2127 } 2128 for (fi = 0; fi < nitems(pr_allow_names); fi++) { 2129 if (pr_allow_names[fi] == NULL) 2130 continue; 2131 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2132 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2133 if (error != 0 && error != ENOENT) 2134 goto done_deref; 2135 i = !i; 2136 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2137 if (error != 0 && error != ENOENT) 2138 goto done_deref; 2139 } 2140 i = (pr->pr_uref == 0); 2141 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2142 if (error != 0 && error != ENOENT) 2143 goto done_deref; 2144 i = !i; 2145 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2146 if (error != 0 && error != ENOENT) 2147 goto done_deref; 2148 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2149 sizeof(pr->pr_osreldate)); 2150 if (error != 0 && error != ENOENT) 2151 goto done_deref; 2152 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2153 if (error != 0 && error != ENOENT) 2154 goto done_deref; 2155 2156 /* Get the module parameters. */ 2157 mtx_unlock(&pr->pr_mtx); 2158 locked = 0; 2159 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2160 if (error) 2161 goto done_deref; 2162 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2163 2164 /* By now, all parameters should have been noted. */ 2165 TAILQ_FOREACH(opt, opts, link) { 2166 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2167 error = EINVAL; 2168 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2169 goto done_errmsg; 2170 } 2171 } 2172 2173 /* Write the fetched parameters back to userspace. */ 2174 error = 0; 2175 TAILQ_FOREACH(opt, opts, link) { 2176 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2177 pos = 2 * opt->pos + 1; 2178 optuio->uio_iov[pos].iov_len = opt->len; 2179 if (opt->value != NULL) { 2180 if (optuio->uio_segflg == UIO_SYSSPACE) { 2181 bcopy(opt->value, 2182 optuio->uio_iov[pos].iov_base, 2183 opt->len); 2184 } else { 2185 error = copyout(opt->value, 2186 optuio->uio_iov[pos].iov_base, 2187 opt->len); 2188 if (error) 2189 break; 2190 } 2191 } 2192 } 2193 } 2194 goto done_errmsg; 2195 2196 done_deref: 2197 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2198 goto done_errmsg; 2199 2200 done_unlock_list: 2201 sx_sunlock(&allprison_lock); 2202 done_errmsg: 2203 if (error && errmsg_pos >= 0) { 2204 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2205 errmsg_pos = 2 * errmsg_pos + 1; 2206 if (errmsg_len > 0) { 2207 if (optuio->uio_segflg == UIO_SYSSPACE) 2208 bcopy(errmsg, 2209 optuio->uio_iov[errmsg_pos].iov_base, 2210 errmsg_len); 2211 else 2212 copyout(errmsg, 2213 optuio->uio_iov[errmsg_pos].iov_base, 2214 errmsg_len); 2215 } 2216 } 2217 vfs_freeopts(opts); 2218 return (error); 2219 } 2220 2221 2222 /* 2223 * struct jail_remove_args { 2224 * int jid; 2225 * }; 2226 */ 2227 int 2228 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2229 { 2230 struct prison *pr, *cpr, *lpr, *tpr; 2231 int descend, error; 2232 2233 error = priv_check(td, PRIV_JAIL_REMOVE); 2234 if (error) 2235 return (error); 2236 2237 sx_xlock(&allprison_lock); 2238 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2239 if (pr == NULL) { 2240 sx_xunlock(&allprison_lock); 2241 return (EINVAL); 2242 } 2243 2244 /* Remove all descendants of this prison, then remove this prison. */ 2245 pr->pr_ref++; 2246 if (!LIST_EMPTY(&pr->pr_children)) { 2247 mtx_unlock(&pr->pr_mtx); 2248 lpr = NULL; 2249 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2250 mtx_lock(&cpr->pr_mtx); 2251 if (cpr->pr_ref > 0) { 2252 tpr = cpr; 2253 cpr->pr_ref++; 2254 } else { 2255 /* Already removed - do not do it again. */ 2256 tpr = NULL; 2257 } 2258 mtx_unlock(&cpr->pr_mtx); 2259 if (lpr != NULL) { 2260 mtx_lock(&lpr->pr_mtx); 2261 prison_remove_one(lpr); 2262 sx_xlock(&allprison_lock); 2263 } 2264 lpr = tpr; 2265 } 2266 if (lpr != NULL) { 2267 mtx_lock(&lpr->pr_mtx); 2268 prison_remove_one(lpr); 2269 sx_xlock(&allprison_lock); 2270 } 2271 mtx_lock(&pr->pr_mtx); 2272 } 2273 prison_remove_one(pr); 2274 return (0); 2275 } 2276 2277 static void 2278 prison_remove_one(struct prison *pr) 2279 { 2280 struct proc *p; 2281 int deuref; 2282 2283 /* If the prison was persistent, it is not anymore. */ 2284 deuref = 0; 2285 if (pr->pr_flags & PR_PERSIST) { 2286 pr->pr_ref--; 2287 deuref = PD_DEUREF; 2288 pr->pr_flags &= ~PR_PERSIST; 2289 } 2290 2291 /* 2292 * jail_remove added a reference. If that's the only one, remove 2293 * the prison now. 2294 */ 2295 KASSERT(pr->pr_ref > 0, 2296 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2297 if (pr->pr_ref == 1) { 2298 prison_deref(pr, 2299 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2300 return; 2301 } 2302 2303 mtx_unlock(&pr->pr_mtx); 2304 sx_xunlock(&allprison_lock); 2305 /* 2306 * Kill all processes unfortunate enough to be attached to this prison. 2307 */ 2308 sx_slock(&allproc_lock); 2309 LIST_FOREACH(p, &allproc, p_list) { 2310 PROC_LOCK(p); 2311 if (p->p_state != PRS_NEW && p->p_ucred && 2312 p->p_ucred->cr_prison == pr) 2313 kern_psignal(p, SIGKILL); 2314 PROC_UNLOCK(p); 2315 } 2316 sx_sunlock(&allproc_lock); 2317 /* Remove the temporary reference added by jail_remove. */ 2318 prison_deref(pr, deuref | PD_DEREF); 2319 } 2320 2321 2322 /* 2323 * struct jail_attach_args { 2324 * int jid; 2325 * }; 2326 */ 2327 int 2328 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2329 { 2330 struct prison *pr; 2331 int error; 2332 2333 error = priv_check(td, PRIV_JAIL_ATTACH); 2334 if (error) 2335 return (error); 2336 2337 /* 2338 * Start with exclusive hold on allprison_lock to ensure that a possible 2339 * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove. 2340 * But then immediately downgrade it since we don't need to stop 2341 * readers. 2342 */ 2343 sx_xlock(&allprison_lock); 2344 sx_downgrade(&allprison_lock); 2345 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2346 if (pr == NULL) { 2347 sx_sunlock(&allprison_lock); 2348 return (EINVAL); 2349 } 2350 2351 /* 2352 * Do not allow a process to attach to a prison that is not 2353 * considered to be "alive". 2354 */ 2355 if (pr->pr_uref == 0) { 2356 mtx_unlock(&pr->pr_mtx); 2357 sx_sunlock(&allprison_lock); 2358 return (EINVAL); 2359 } 2360 2361 return (do_jail_attach(td, pr)); 2362 } 2363 2364 static int 2365 do_jail_attach(struct thread *td, struct prison *pr) 2366 { 2367 struct proc *p; 2368 struct ucred *newcred, *oldcred; 2369 int error; 2370 2371 /* 2372 * XXX: Note that there is a slight race here if two threads 2373 * in the same privileged process attempt to attach to two 2374 * different jails at the same time. It is important for 2375 * user processes not to do this, or they might end up with 2376 * a process root from one prison, but attached to the jail 2377 * of another. 2378 */ 2379 pr->pr_ref++; 2380 pr->pr_uref++; 2381 mtx_unlock(&pr->pr_mtx); 2382 2383 /* Let modules do whatever they need to prepare for attaching. */ 2384 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2385 if (error) { 2386 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2387 return (error); 2388 } 2389 sx_sunlock(&allprison_lock); 2390 2391 /* 2392 * Reparent the newly attached process to this jail. 2393 */ 2394 p = td->td_proc; 2395 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2396 if (error) 2397 goto e_revert_osd; 2398 2399 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2400 if ((error = change_dir(pr->pr_root, td)) != 0) 2401 goto e_unlock; 2402 #ifdef MAC 2403 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2404 goto e_unlock; 2405 #endif 2406 VOP_UNLOCK(pr->pr_root, 0); 2407 if ((error = pwd_chroot(td, pr->pr_root))) 2408 goto e_revert_osd; 2409 2410 newcred = crget(); 2411 PROC_LOCK(p); 2412 oldcred = crcopysafe(p, newcred); 2413 newcred->cr_prison = pr; 2414 proc_set_cred(p, newcred); 2415 setsugid(p); 2416 PROC_UNLOCK(p); 2417 #ifdef RACCT 2418 racct_proc_ucred_changed(p, oldcred, newcred); 2419 #endif 2420 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF); 2421 crfree(oldcred); 2422 return (0); 2423 2424 e_unlock: 2425 VOP_UNLOCK(pr->pr_root, 0); 2426 e_revert_osd: 2427 /* Tell modules this thread is still in its old jail after all. */ 2428 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2429 prison_deref(pr, PD_DEREF | PD_DEUREF); 2430 return (error); 2431 } 2432 2433 2434 /* 2435 * Returns a locked prison instance, or NULL on failure. 2436 */ 2437 struct prison * 2438 prison_find(int prid) 2439 { 2440 struct prison *pr; 2441 2442 sx_assert(&allprison_lock, SX_LOCKED); 2443 TAILQ_FOREACH(pr, &allprison, pr_list) { 2444 if (pr->pr_id == prid) { 2445 mtx_lock(&pr->pr_mtx); 2446 if (pr->pr_ref > 0) 2447 return (pr); 2448 mtx_unlock(&pr->pr_mtx); 2449 } 2450 } 2451 return (NULL); 2452 } 2453 2454 /* 2455 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2456 */ 2457 struct prison * 2458 prison_find_child(struct prison *mypr, int prid) 2459 { 2460 struct prison *pr; 2461 int descend; 2462 2463 sx_assert(&allprison_lock, SX_LOCKED); 2464 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2465 if (pr->pr_id == prid) { 2466 mtx_lock(&pr->pr_mtx); 2467 if (pr->pr_ref > 0) 2468 return (pr); 2469 mtx_unlock(&pr->pr_mtx); 2470 } 2471 } 2472 return (NULL); 2473 } 2474 2475 /* 2476 * Look for the name relative to mypr. Returns a locked prison or NULL. 2477 */ 2478 struct prison * 2479 prison_find_name(struct prison *mypr, const char *name) 2480 { 2481 struct prison *pr, *deadpr; 2482 size_t mylen; 2483 int descend; 2484 2485 sx_assert(&allprison_lock, SX_LOCKED); 2486 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2487 again: 2488 deadpr = NULL; 2489 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2490 if (!strcmp(pr->pr_name + mylen, name)) { 2491 mtx_lock(&pr->pr_mtx); 2492 if (pr->pr_ref > 0) { 2493 if (pr->pr_uref > 0) 2494 return (pr); 2495 deadpr = pr; 2496 } 2497 mtx_unlock(&pr->pr_mtx); 2498 } 2499 } 2500 /* There was no valid prison - perhaps there was a dying one. */ 2501 if (deadpr != NULL) { 2502 mtx_lock(&deadpr->pr_mtx); 2503 if (deadpr->pr_ref == 0) { 2504 mtx_unlock(&deadpr->pr_mtx); 2505 goto again; 2506 } 2507 } 2508 return (deadpr); 2509 } 2510 2511 /* 2512 * See if a prison has the specific flag set. 2513 */ 2514 int 2515 prison_flag(struct ucred *cred, unsigned flag) 2516 { 2517 2518 /* This is an atomic read, so no locking is necessary. */ 2519 return (cred->cr_prison->pr_flags & flag); 2520 } 2521 2522 int 2523 prison_allow(struct ucred *cred, unsigned flag) 2524 { 2525 2526 /* This is an atomic read, so no locking is necessary. */ 2527 return (cred->cr_prison->pr_allow & flag); 2528 } 2529 2530 /* 2531 * Remove a prison reference. If that was the last reference, remove the 2532 * prison itself - but not in this context in case there are locks held. 2533 */ 2534 void 2535 prison_free_locked(struct prison *pr) 2536 { 2537 int ref; 2538 2539 mtx_assert(&pr->pr_mtx, MA_OWNED); 2540 ref = --pr->pr_ref; 2541 mtx_unlock(&pr->pr_mtx); 2542 if (ref == 0) 2543 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2544 } 2545 2546 void 2547 prison_free(struct prison *pr) 2548 { 2549 2550 mtx_lock(&pr->pr_mtx); 2551 prison_free_locked(pr); 2552 } 2553 2554 /* 2555 * Complete a call to either prison_free or prison_proc_free. 2556 */ 2557 static void 2558 prison_complete(void *context, int pending) 2559 { 2560 struct prison *pr = context; 2561 2562 sx_xlock(&allprison_lock); 2563 mtx_lock(&pr->pr_mtx); 2564 prison_deref(pr, pr->pr_uref 2565 ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED 2566 : PD_LOCKED | PD_LIST_XLOCKED); 2567 } 2568 2569 /* 2570 * Remove a prison reference (usually). This internal version assumes no 2571 * mutexes are held, except perhaps the prison itself. If there are no more 2572 * references, release and delist the prison. On completion, the prison lock 2573 * and the allprison lock are both unlocked. 2574 */ 2575 static void 2576 prison_deref(struct prison *pr, int flags) 2577 { 2578 struct prison *ppr, *tpr; 2579 int ref, lasturef; 2580 2581 if (!(flags & PD_LOCKED)) 2582 mtx_lock(&pr->pr_mtx); 2583 for (;;) { 2584 if (flags & PD_DEUREF) { 2585 KASSERT(pr->pr_uref > 0, 2586 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 2587 pr->pr_id)); 2588 pr->pr_uref--; 2589 lasturef = pr->pr_uref == 0; 2590 if (lasturef) 2591 pr->pr_ref++; 2592 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2593 } else 2594 lasturef = 0; 2595 if (flags & PD_DEREF) { 2596 KASSERT(pr->pr_ref > 0, 2597 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 2598 pr->pr_id)); 2599 pr->pr_ref--; 2600 } 2601 ref = pr->pr_ref; 2602 mtx_unlock(&pr->pr_mtx); 2603 2604 /* 2605 * Tell the modules if the last user reference was removed 2606 * (even it sticks around in dying state). 2607 */ 2608 if (lasturef) { 2609 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) { 2610 sx_xlock(&allprison_lock); 2611 flags |= PD_LIST_XLOCKED; 2612 } 2613 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 2614 mtx_lock(&pr->pr_mtx); 2615 ref = --pr->pr_ref; 2616 mtx_unlock(&pr->pr_mtx); 2617 } 2618 2619 /* If the prison still has references, nothing else to do. */ 2620 if (ref > 0) { 2621 if (flags & PD_LIST_SLOCKED) 2622 sx_sunlock(&allprison_lock); 2623 else if (flags & PD_LIST_XLOCKED) 2624 sx_xunlock(&allprison_lock); 2625 return; 2626 } 2627 2628 if (flags & PD_LIST_SLOCKED) { 2629 if (!sx_try_upgrade(&allprison_lock)) { 2630 sx_sunlock(&allprison_lock); 2631 sx_xlock(&allprison_lock); 2632 } 2633 } else if (!(flags & PD_LIST_XLOCKED)) 2634 sx_xlock(&allprison_lock); 2635 2636 TAILQ_REMOVE(&allprison, pr, pr_list); 2637 LIST_REMOVE(pr, pr_sibling); 2638 ppr = pr->pr_parent; 2639 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2640 tpr->pr_childcount--; 2641 sx_xunlock(&allprison_lock); 2642 2643 #ifdef VIMAGE 2644 if (pr->pr_vnet != ppr->pr_vnet) 2645 vnet_destroy(pr->pr_vnet); 2646 #endif 2647 if (pr->pr_root != NULL) 2648 vrele(pr->pr_root); 2649 mtx_destroy(&pr->pr_mtx); 2650 #ifdef INET 2651 free(pr->pr_ip4, M_PRISON); 2652 #endif 2653 #ifdef INET6 2654 free(pr->pr_ip6, M_PRISON); 2655 #endif 2656 if (pr->pr_cpuset != NULL) 2657 cpuset_rel(pr->pr_cpuset); 2658 osd_jail_exit(pr); 2659 #ifdef RACCT 2660 if (racct_enable) 2661 prison_racct_detach(pr); 2662 #endif 2663 free(pr, M_PRISON); 2664 2665 /* Removing a prison frees a reference on its parent. */ 2666 pr = ppr; 2667 mtx_lock(&pr->pr_mtx); 2668 flags = PD_DEREF | PD_DEUREF; 2669 } 2670 } 2671 2672 void 2673 prison_hold_locked(struct prison *pr) 2674 { 2675 2676 mtx_assert(&pr->pr_mtx, MA_OWNED); 2677 KASSERT(pr->pr_ref > 0, 2678 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2679 pr->pr_ref++; 2680 } 2681 2682 void 2683 prison_hold(struct prison *pr) 2684 { 2685 2686 mtx_lock(&pr->pr_mtx); 2687 prison_hold_locked(pr); 2688 mtx_unlock(&pr->pr_mtx); 2689 } 2690 2691 void 2692 prison_proc_hold(struct prison *pr) 2693 { 2694 2695 mtx_lock(&pr->pr_mtx); 2696 KASSERT(pr->pr_uref > 0, 2697 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2698 pr->pr_uref++; 2699 mtx_unlock(&pr->pr_mtx); 2700 } 2701 2702 void 2703 prison_proc_free(struct prison *pr) 2704 { 2705 2706 mtx_lock(&pr->pr_mtx); 2707 KASSERT(pr->pr_uref > 0, 2708 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2709 if (pr->pr_uref > 1) 2710 pr->pr_uref--; 2711 else { 2712 /* 2713 * Don't remove the last user reference in this context, which 2714 * is expected to be a process that is not only locked, but 2715 * also half dead. 2716 */ 2717 pr->pr_ref++; 2718 mtx_unlock(&pr->pr_mtx); 2719 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2720 return; 2721 } 2722 mtx_unlock(&pr->pr_mtx); 2723 } 2724 2725 /* 2726 * Check if a jail supports the given address family. 2727 * 2728 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 2729 * if not. 2730 */ 2731 int 2732 prison_check_af(struct ucred *cred, int af) 2733 { 2734 struct prison *pr; 2735 int error; 2736 2737 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2738 2739 pr = cred->cr_prison; 2740 #ifdef VIMAGE 2741 /* Prisons with their own network stack are not limited. */ 2742 if (prison_owns_vnet(cred)) 2743 return (0); 2744 #endif 2745 2746 error = 0; 2747 switch (af) 2748 { 2749 #ifdef INET 2750 case AF_INET: 2751 if (pr->pr_flags & PR_IP4) 2752 { 2753 mtx_lock(&pr->pr_mtx); 2754 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 2755 error = EAFNOSUPPORT; 2756 mtx_unlock(&pr->pr_mtx); 2757 } 2758 break; 2759 #endif 2760 #ifdef INET6 2761 case AF_INET6: 2762 if (pr->pr_flags & PR_IP6) 2763 { 2764 mtx_lock(&pr->pr_mtx); 2765 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 2766 error = EAFNOSUPPORT; 2767 mtx_unlock(&pr->pr_mtx); 2768 } 2769 break; 2770 #endif 2771 case AF_LOCAL: 2772 case AF_ROUTE: 2773 break; 2774 default: 2775 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 2776 error = EAFNOSUPPORT; 2777 } 2778 return (error); 2779 } 2780 2781 /* 2782 * Check if given address belongs to the jail referenced by cred (wrapper to 2783 * prison_check_ip[46]). 2784 * 2785 * Returns 0 if jail doesn't restrict the address family or if address belongs 2786 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 2787 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 2788 */ 2789 int 2790 prison_if(struct ucred *cred, struct sockaddr *sa) 2791 { 2792 #ifdef INET 2793 struct sockaddr_in *sai; 2794 #endif 2795 #ifdef INET6 2796 struct sockaddr_in6 *sai6; 2797 #endif 2798 int error; 2799 2800 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2801 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 2802 2803 #ifdef VIMAGE 2804 if (prison_owns_vnet(cred)) 2805 return (0); 2806 #endif 2807 2808 error = 0; 2809 switch (sa->sa_family) 2810 { 2811 #ifdef INET 2812 case AF_INET: 2813 sai = (struct sockaddr_in *)sa; 2814 error = prison_check_ip4(cred, &sai->sin_addr); 2815 break; 2816 #endif 2817 #ifdef INET6 2818 case AF_INET6: 2819 sai6 = (struct sockaddr_in6 *)sa; 2820 error = prison_check_ip6(cred, &sai6->sin6_addr); 2821 break; 2822 #endif 2823 default: 2824 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 2825 error = EAFNOSUPPORT; 2826 } 2827 return (error); 2828 } 2829 2830 /* 2831 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 2832 */ 2833 int 2834 prison_check(struct ucred *cred1, struct ucred *cred2) 2835 { 2836 2837 return ((cred1->cr_prison == cred2->cr_prison || 2838 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 2839 } 2840 2841 /* 2842 * Return 1 if p2 is a child of p1, otherwise 0. 2843 */ 2844 int 2845 prison_ischild(struct prison *pr1, struct prison *pr2) 2846 { 2847 2848 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 2849 if (pr1 == pr2) 2850 return (1); 2851 return (0); 2852 } 2853 2854 /* 2855 * Return 1 if the passed credential is in a jail, otherwise 0. 2856 */ 2857 int 2858 jailed(struct ucred *cred) 2859 { 2860 2861 return (cred->cr_prison != &prison0); 2862 } 2863 2864 /* 2865 * Return 1 if the passed credential is in a jail and that jail does not 2866 * have its own virtual network stack, otherwise 0. 2867 */ 2868 int 2869 jailed_without_vnet(struct ucred *cred) 2870 { 2871 2872 if (!jailed(cred)) 2873 return (0); 2874 #ifdef VIMAGE 2875 if (prison_owns_vnet(cred)) 2876 return (0); 2877 #endif 2878 2879 return (1); 2880 } 2881 2882 /* 2883 * Return the correct hostname (domainname, et al) for the passed credential. 2884 */ 2885 void 2886 getcredhostname(struct ucred *cred, char *buf, size_t size) 2887 { 2888 struct prison *pr; 2889 2890 /* 2891 * A NULL credential can be used to shortcut to the physical 2892 * system's hostname. 2893 */ 2894 pr = (cred != NULL) ? cred->cr_prison : &prison0; 2895 mtx_lock(&pr->pr_mtx); 2896 strlcpy(buf, pr->pr_hostname, size); 2897 mtx_unlock(&pr->pr_mtx); 2898 } 2899 2900 void 2901 getcreddomainname(struct ucred *cred, char *buf, size_t size) 2902 { 2903 2904 mtx_lock(&cred->cr_prison->pr_mtx); 2905 strlcpy(buf, cred->cr_prison->pr_domainname, size); 2906 mtx_unlock(&cred->cr_prison->pr_mtx); 2907 } 2908 2909 void 2910 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 2911 { 2912 2913 mtx_lock(&cred->cr_prison->pr_mtx); 2914 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 2915 mtx_unlock(&cred->cr_prison->pr_mtx); 2916 } 2917 2918 void 2919 getcredhostid(struct ucred *cred, unsigned long *hostid) 2920 { 2921 2922 mtx_lock(&cred->cr_prison->pr_mtx); 2923 *hostid = cred->cr_prison->pr_hostid; 2924 mtx_unlock(&cred->cr_prison->pr_mtx); 2925 } 2926 2927 #ifdef VIMAGE 2928 /* 2929 * Determine whether the prison represented by cred owns 2930 * its vnet rather than having it inherited. 2931 * 2932 * Returns 1 in case the prison owns the vnet, 0 otherwise. 2933 */ 2934 int 2935 prison_owns_vnet(struct ucred *cred) 2936 { 2937 2938 /* 2939 * vnets cannot be added/removed after jail creation, 2940 * so no need to lock here. 2941 */ 2942 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 2943 } 2944 #endif 2945 2946 /* 2947 * Determine whether the subject represented by cred can "see" 2948 * status of a mount point. 2949 * Returns: 0 for permitted, ENOENT otherwise. 2950 * XXX: This function should be called cr_canseemount() and should be 2951 * placed in kern_prot.c. 2952 */ 2953 int 2954 prison_canseemount(struct ucred *cred, struct mount *mp) 2955 { 2956 struct prison *pr; 2957 struct statfs *sp; 2958 size_t len; 2959 2960 pr = cred->cr_prison; 2961 if (pr->pr_enforce_statfs == 0) 2962 return (0); 2963 if (pr->pr_root->v_mount == mp) 2964 return (0); 2965 if (pr->pr_enforce_statfs == 2) 2966 return (ENOENT); 2967 /* 2968 * If jail's chroot directory is set to "/" we should be able to see 2969 * all mount-points from inside a jail. 2970 * This is ugly check, but this is the only situation when jail's 2971 * directory ends with '/'. 2972 */ 2973 if (strcmp(pr->pr_path, "/") == 0) 2974 return (0); 2975 len = strlen(pr->pr_path); 2976 sp = &mp->mnt_stat; 2977 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 2978 return (ENOENT); 2979 /* 2980 * Be sure that we don't have situation where jail's root directory 2981 * is "/some/path" and mount point is "/some/pathpath". 2982 */ 2983 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 2984 return (ENOENT); 2985 return (0); 2986 } 2987 2988 void 2989 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 2990 { 2991 char jpath[MAXPATHLEN]; 2992 struct prison *pr; 2993 size_t len; 2994 2995 pr = cred->cr_prison; 2996 if (pr->pr_enforce_statfs == 0) 2997 return; 2998 if (prison_canseemount(cred, mp) != 0) { 2999 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3000 strlcpy(sp->f_mntonname, "[restricted]", 3001 sizeof(sp->f_mntonname)); 3002 return; 3003 } 3004 if (pr->pr_root->v_mount == mp) { 3005 /* 3006 * Clear current buffer data, so we are sure nothing from 3007 * the valid path left there. 3008 */ 3009 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3010 *sp->f_mntonname = '/'; 3011 return; 3012 } 3013 /* 3014 * If jail's chroot directory is set to "/" we should be able to see 3015 * all mount-points from inside a jail. 3016 */ 3017 if (strcmp(pr->pr_path, "/") == 0) 3018 return; 3019 len = strlen(pr->pr_path); 3020 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3021 /* 3022 * Clear current buffer data, so we are sure nothing from 3023 * the valid path left there. 3024 */ 3025 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3026 if (*jpath == '\0') { 3027 /* Should never happen. */ 3028 *sp->f_mntonname = '/'; 3029 } else { 3030 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3031 } 3032 } 3033 3034 /* 3035 * Check with permission for a specific privilege is granted within jail. We 3036 * have a specific list of accepted privileges; the rest are denied. 3037 */ 3038 int 3039 prison_priv_check(struct ucred *cred, int priv) 3040 { 3041 3042 if (!jailed(cred)) 3043 return (0); 3044 3045 #ifdef VIMAGE 3046 /* 3047 * Privileges specific to prisons with a virtual network stack. 3048 * There might be a duplicate entry here in case the privilege 3049 * is only granted conditionally in the legacy jail case. 3050 */ 3051 switch (priv) { 3052 #ifdef notyet 3053 /* 3054 * NFS-specific privileges. 3055 */ 3056 case PRIV_NFS_DAEMON: 3057 case PRIV_NFS_LOCKD: 3058 #endif 3059 /* 3060 * Network stack privileges. 3061 */ 3062 case PRIV_NET_BRIDGE: 3063 case PRIV_NET_GRE: 3064 case PRIV_NET_BPF: 3065 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3066 case PRIV_NET_ROUTE: 3067 case PRIV_NET_TAP: 3068 case PRIV_NET_SETIFMTU: 3069 case PRIV_NET_SETIFFLAGS: 3070 case PRIV_NET_SETIFCAP: 3071 case PRIV_NET_SETIFDESCR: 3072 case PRIV_NET_SETIFNAME : 3073 case PRIV_NET_SETIFMETRIC: 3074 case PRIV_NET_SETIFPHYS: 3075 case PRIV_NET_SETIFMAC: 3076 case PRIV_NET_ADDMULTI: 3077 case PRIV_NET_DELMULTI: 3078 case PRIV_NET_HWIOCTL: 3079 case PRIV_NET_SETLLADDR: 3080 case PRIV_NET_ADDIFGROUP: 3081 case PRIV_NET_DELIFGROUP: 3082 case PRIV_NET_IFCREATE: 3083 case PRIV_NET_IFDESTROY: 3084 case PRIV_NET_ADDIFADDR: 3085 case PRIV_NET_DELIFADDR: 3086 case PRIV_NET_LAGG: 3087 case PRIV_NET_GIF: 3088 case PRIV_NET_SETIFVNET: 3089 case PRIV_NET_SETIFFIB: 3090 3091 /* 3092 * 802.11-related privileges. 3093 */ 3094 case PRIV_NET80211_GETKEY: 3095 #ifdef notyet 3096 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3097 #endif 3098 3099 #ifdef notyet 3100 /* 3101 * ATM privileges. 3102 */ 3103 case PRIV_NETATM_CFG: 3104 case PRIV_NETATM_ADD: 3105 case PRIV_NETATM_DEL: 3106 case PRIV_NETATM_SET: 3107 3108 /* 3109 * Bluetooth privileges. 3110 */ 3111 case PRIV_NETBLUETOOTH_RAW: 3112 #endif 3113 3114 /* 3115 * Netgraph and netgraph module privileges. 3116 */ 3117 case PRIV_NETGRAPH_CONTROL: 3118 #ifdef notyet 3119 case PRIV_NETGRAPH_TTY: 3120 #endif 3121 3122 /* 3123 * IPv4 and IPv6 privileges. 3124 */ 3125 case PRIV_NETINET_IPFW: 3126 case PRIV_NETINET_DIVERT: 3127 case PRIV_NETINET_PF: 3128 case PRIV_NETINET_DUMMYNET: 3129 case PRIV_NETINET_CARP: 3130 case PRIV_NETINET_MROUTE: 3131 case PRIV_NETINET_RAW: 3132 case PRIV_NETINET_ADDRCTRL6: 3133 case PRIV_NETINET_ND6: 3134 case PRIV_NETINET_SCOPE6: 3135 case PRIV_NETINET_ALIFETIME6: 3136 case PRIV_NETINET_IPSEC: 3137 case PRIV_NETINET_BINDANY: 3138 3139 #ifdef notyet 3140 /* 3141 * NCP privileges. 3142 */ 3143 case PRIV_NETNCP: 3144 3145 /* 3146 * SMB privileges. 3147 */ 3148 case PRIV_NETSMB: 3149 #endif 3150 3151 /* 3152 * No default: or deny here. 3153 * In case of no permit fall through to next switch(). 3154 */ 3155 if (cred->cr_prison->pr_flags & PR_VNET) 3156 return (0); 3157 } 3158 #endif /* VIMAGE */ 3159 3160 switch (priv) { 3161 3162 /* 3163 * Allow ktrace privileges for root in jail. 3164 */ 3165 case PRIV_KTRACE: 3166 3167 #if 0 3168 /* 3169 * Allow jailed processes to configure audit identity and 3170 * submit audit records (login, etc). In the future we may 3171 * want to further refine the relationship between audit and 3172 * jail. 3173 */ 3174 case PRIV_AUDIT_GETAUDIT: 3175 case PRIV_AUDIT_SETAUDIT: 3176 case PRIV_AUDIT_SUBMIT: 3177 #endif 3178 3179 /* 3180 * Allow jailed processes to manipulate process UNIX 3181 * credentials in any way they see fit. 3182 */ 3183 case PRIV_CRED_SETUID: 3184 case PRIV_CRED_SETEUID: 3185 case PRIV_CRED_SETGID: 3186 case PRIV_CRED_SETEGID: 3187 case PRIV_CRED_SETGROUPS: 3188 case PRIV_CRED_SETREUID: 3189 case PRIV_CRED_SETREGID: 3190 case PRIV_CRED_SETRESUID: 3191 case PRIV_CRED_SETRESGID: 3192 3193 /* 3194 * Jail implements visibility constraints already, so allow 3195 * jailed root to override uid/gid-based constraints. 3196 */ 3197 case PRIV_SEEOTHERGIDS: 3198 case PRIV_SEEOTHERUIDS: 3199 3200 /* 3201 * Jail implements inter-process debugging limits already, so 3202 * allow jailed root various debugging privileges. 3203 */ 3204 case PRIV_DEBUG_DIFFCRED: 3205 case PRIV_DEBUG_SUGID: 3206 case PRIV_DEBUG_UNPRIV: 3207 3208 /* 3209 * Allow jail to set various resource limits and login 3210 * properties, and for now, exceed process resource limits. 3211 */ 3212 case PRIV_PROC_LIMIT: 3213 case PRIV_PROC_SETLOGIN: 3214 case PRIV_PROC_SETRLIMIT: 3215 3216 /* 3217 * System V and POSIX IPC privileges are granted in jail. 3218 */ 3219 case PRIV_IPC_READ: 3220 case PRIV_IPC_WRITE: 3221 case PRIV_IPC_ADMIN: 3222 case PRIV_IPC_MSGSIZE: 3223 case PRIV_MQ_ADMIN: 3224 3225 /* 3226 * Jail operations within a jail work on child jails. 3227 */ 3228 case PRIV_JAIL_ATTACH: 3229 case PRIV_JAIL_SET: 3230 case PRIV_JAIL_REMOVE: 3231 3232 /* 3233 * Jail implements its own inter-process limits, so allow 3234 * root processes in jail to change scheduling on other 3235 * processes in the same jail. Likewise for signalling. 3236 */ 3237 case PRIV_SCHED_DIFFCRED: 3238 case PRIV_SCHED_CPUSET: 3239 case PRIV_SIGNAL_DIFFCRED: 3240 case PRIV_SIGNAL_SUGID: 3241 3242 /* 3243 * Allow jailed processes to write to sysctls marked as jail 3244 * writable. 3245 */ 3246 case PRIV_SYSCTL_WRITEJAIL: 3247 3248 /* 3249 * Allow root in jail to manage a variety of quota 3250 * properties. These should likely be conditional on a 3251 * configuration option. 3252 */ 3253 case PRIV_VFS_GETQUOTA: 3254 case PRIV_VFS_SETQUOTA: 3255 3256 /* 3257 * Since Jail relies on chroot() to implement file system 3258 * protections, grant many VFS privileges to root in jail. 3259 * Be careful to exclude mount-related and NFS-related 3260 * privileges. 3261 */ 3262 case PRIV_VFS_READ: 3263 case PRIV_VFS_WRITE: 3264 case PRIV_VFS_ADMIN: 3265 case PRIV_VFS_EXEC: 3266 case PRIV_VFS_LOOKUP: 3267 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3268 case PRIV_VFS_CHFLAGS_DEV: 3269 case PRIV_VFS_CHOWN: 3270 case PRIV_VFS_CHROOT: 3271 case PRIV_VFS_RETAINSUGID: 3272 case PRIV_VFS_FCHROOT: 3273 case PRIV_VFS_LINK: 3274 case PRIV_VFS_SETGID: 3275 case PRIV_VFS_STAT: 3276 case PRIV_VFS_STICKYFILE: 3277 3278 /* 3279 * As in the non-jail case, non-root users are expected to be 3280 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3281 * exists in the jail and they have permission to access it). 3282 */ 3283 case PRIV_KMEM_READ: 3284 return (0); 3285 3286 /* 3287 * Depending on the global setting, allow privilege of 3288 * setting system flags. 3289 */ 3290 case PRIV_VFS_SYSFLAGS: 3291 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3292 return (0); 3293 else 3294 return (EPERM); 3295 3296 /* 3297 * Depending on the global setting, allow privilege of 3298 * mounting/unmounting file systems. 3299 */ 3300 case PRIV_VFS_MOUNT: 3301 case PRIV_VFS_UNMOUNT: 3302 case PRIV_VFS_MOUNT_NONUSER: 3303 case PRIV_VFS_MOUNT_OWNER: 3304 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3305 cred->cr_prison->pr_enforce_statfs < 2) 3306 return (0); 3307 else 3308 return (EPERM); 3309 3310 /* 3311 * Conditionally allow jailed root to bind reserved ports. 3312 */ 3313 case PRIV_NETINET_RESERVEDPORT: 3314 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS) 3315 return (0); 3316 else 3317 return (EPERM); 3318 3319 /* 3320 * Allow jailed root to reuse in-use ports. 3321 */ 3322 case PRIV_NETINET_REUSEPORT: 3323 return (0); 3324 3325 /* 3326 * Allow jailed root to set certain IPv4/6 (option) headers. 3327 */ 3328 case PRIV_NETINET_SETHDROPTS: 3329 return (0); 3330 3331 /* 3332 * Conditionally allow creating raw sockets in jail. 3333 */ 3334 case PRIV_NETINET_RAW: 3335 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3336 return (0); 3337 else 3338 return (EPERM); 3339 3340 /* 3341 * Since jail implements its own visibility limits on netstat 3342 * sysctls, allow getcred. This allows identd to work in 3343 * jail. 3344 */ 3345 case PRIV_NETINET_GETCRED: 3346 return (0); 3347 3348 /* 3349 * Allow jailed root to set loginclass. 3350 */ 3351 case PRIV_PROC_SETLOGINCLASS: 3352 return (0); 3353 3354 default: 3355 /* 3356 * In all remaining cases, deny the privilege request. This 3357 * includes almost all network privileges, many system 3358 * configuration privileges. 3359 */ 3360 return (EPERM); 3361 } 3362 } 3363 3364 /* 3365 * Return the part of pr2's name that is relative to pr1, or the whole name 3366 * if it does not directly follow. 3367 */ 3368 3369 char * 3370 prison_name(struct prison *pr1, struct prison *pr2) 3371 { 3372 char *name; 3373 3374 /* Jails see themselves as "0" (if they see themselves at all). */ 3375 if (pr1 == pr2) 3376 return "0"; 3377 name = pr2->pr_name; 3378 if (prison_ischild(pr1, pr2)) { 3379 /* 3380 * pr1 isn't locked (and allprison_lock may not be either) 3381 * so its length can't be counted on. But the number of dots 3382 * can be counted on - and counted. 3383 */ 3384 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3385 name = strchr(name, '.') + 1; 3386 } 3387 return (name); 3388 } 3389 3390 /* 3391 * Return the part of pr2's path that is relative to pr1, or the whole path 3392 * if it does not directly follow. 3393 */ 3394 static char * 3395 prison_path(struct prison *pr1, struct prison *pr2) 3396 { 3397 char *path1, *path2; 3398 int len1; 3399 3400 path1 = pr1->pr_path; 3401 path2 = pr2->pr_path; 3402 if (!strcmp(path1, "/")) 3403 return (path2); 3404 len1 = strlen(path1); 3405 if (strncmp(path1, path2, len1)) 3406 return (path2); 3407 if (path2[len1] == '\0') 3408 return "/"; 3409 if (path2[len1] == '/') 3410 return (path2 + len1); 3411 return (path2); 3412 } 3413 3414 3415 /* 3416 * Jail-related sysctls. 3417 */ 3418 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 3419 "Jails"); 3420 3421 static int 3422 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 3423 { 3424 struct xprison *xp; 3425 struct prison *pr, *cpr; 3426 #ifdef INET 3427 struct in_addr *ip4 = NULL; 3428 int ip4s = 0; 3429 #endif 3430 #ifdef INET6 3431 struct in6_addr *ip6 = NULL; 3432 int ip6s = 0; 3433 #endif 3434 int descend, error; 3435 3436 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 3437 pr = req->td->td_ucred->cr_prison; 3438 error = 0; 3439 sx_slock(&allprison_lock); 3440 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 3441 #if defined(INET) || defined(INET6) 3442 again: 3443 #endif 3444 mtx_lock(&cpr->pr_mtx); 3445 #ifdef INET 3446 if (cpr->pr_ip4s > 0) { 3447 if (ip4s < cpr->pr_ip4s) { 3448 ip4s = cpr->pr_ip4s; 3449 mtx_unlock(&cpr->pr_mtx); 3450 ip4 = realloc(ip4, ip4s * 3451 sizeof(struct in_addr), M_TEMP, M_WAITOK); 3452 goto again; 3453 } 3454 bcopy(cpr->pr_ip4, ip4, 3455 cpr->pr_ip4s * sizeof(struct in_addr)); 3456 } 3457 #endif 3458 #ifdef INET6 3459 if (cpr->pr_ip6s > 0) { 3460 if (ip6s < cpr->pr_ip6s) { 3461 ip6s = cpr->pr_ip6s; 3462 mtx_unlock(&cpr->pr_mtx); 3463 ip6 = realloc(ip6, ip6s * 3464 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 3465 goto again; 3466 } 3467 bcopy(cpr->pr_ip6, ip6, 3468 cpr->pr_ip6s * sizeof(struct in6_addr)); 3469 } 3470 #endif 3471 if (cpr->pr_ref == 0) { 3472 mtx_unlock(&cpr->pr_mtx); 3473 continue; 3474 } 3475 bzero(xp, sizeof(*xp)); 3476 xp->pr_version = XPRISON_VERSION; 3477 xp->pr_id = cpr->pr_id; 3478 xp->pr_state = cpr->pr_uref > 0 3479 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 3480 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 3481 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 3482 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 3483 #ifdef INET 3484 xp->pr_ip4s = cpr->pr_ip4s; 3485 #endif 3486 #ifdef INET6 3487 xp->pr_ip6s = cpr->pr_ip6s; 3488 #endif 3489 mtx_unlock(&cpr->pr_mtx); 3490 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 3491 if (error) 3492 break; 3493 #ifdef INET 3494 if (xp->pr_ip4s > 0) { 3495 error = SYSCTL_OUT(req, ip4, 3496 xp->pr_ip4s * sizeof(struct in_addr)); 3497 if (error) 3498 break; 3499 } 3500 #endif 3501 #ifdef INET6 3502 if (xp->pr_ip6s > 0) { 3503 error = SYSCTL_OUT(req, ip6, 3504 xp->pr_ip6s * sizeof(struct in6_addr)); 3505 if (error) 3506 break; 3507 } 3508 #endif 3509 } 3510 sx_sunlock(&allprison_lock); 3511 free(xp, M_TEMP); 3512 #ifdef INET 3513 free(ip4, M_TEMP); 3514 #endif 3515 #ifdef INET6 3516 free(ip6, M_TEMP); 3517 #endif 3518 return (error); 3519 } 3520 3521 SYSCTL_OID(_security_jail, OID_AUTO, list, 3522 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3523 sysctl_jail_list, "S", "List of active jails"); 3524 3525 static int 3526 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 3527 { 3528 int error, injail; 3529 3530 injail = jailed(req->td->td_ucred); 3531 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 3532 3533 return (error); 3534 } 3535 3536 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 3537 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3538 sysctl_jail_jailed, "I", "Process in jail?"); 3539 3540 static int 3541 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 3542 { 3543 int error, havevnet; 3544 #ifdef VIMAGE 3545 struct ucred *cred = req->td->td_ucred; 3546 3547 havevnet = jailed(cred) && prison_owns_vnet(cred); 3548 #else 3549 havevnet = 0; 3550 #endif 3551 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 3552 3553 return (error); 3554 } 3555 3556 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 3557 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3558 sysctl_jail_vnet, "I", "Jail owns VNET?"); 3559 3560 #if defined(INET) || defined(INET6) 3561 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 3562 &jail_max_af_ips, 0, 3563 "Number of IP addresses a jail may have at most per address family (deprecated)"); 3564 #endif 3565 3566 /* 3567 * Default parameters for jail(2) compatibility. For historical reasons, 3568 * the sysctl names have varying similarity to the parameter names. Prisons 3569 * just see their own parameters, and can't change them. 3570 */ 3571 static int 3572 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 3573 { 3574 struct prison *pr; 3575 int allow, error, i; 3576 3577 pr = req->td->td_ucred->cr_prison; 3578 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 3579 3580 /* Get the current flag value, and convert it to a boolean. */ 3581 i = (allow & arg2) ? 1 : 0; 3582 if (arg1 != NULL) 3583 i = !i; 3584 error = sysctl_handle_int(oidp, &i, 0, req); 3585 if (error || !req->newptr) 3586 return (error); 3587 i = i ? arg2 : 0; 3588 if (arg1 != NULL) 3589 i ^= arg2; 3590 /* 3591 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 3592 * for writing. 3593 */ 3594 mtx_lock(&prison0.pr_mtx); 3595 jail_default_allow = (jail_default_allow & ~arg2) | i; 3596 mtx_unlock(&prison0.pr_mtx); 3597 return (0); 3598 } 3599 3600 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 3601 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3602 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 3603 "Processes in jail can set their hostnames (deprecated)"); 3604 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 3605 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3606 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 3607 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 3608 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 3609 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3610 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 3611 "Processes in jail can use System V IPC primitives (deprecated)"); 3612 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 3613 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3614 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 3615 "Prison root can create raw sockets (deprecated)"); 3616 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 3617 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3618 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 3619 "Processes in jail can alter system file flags (deprecated)"); 3620 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 3621 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3622 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 3623 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 3624 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed, 3625 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3626 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I", 3627 "Processes in jail can mount the devfs file system (deprecated)"); 3628 SYSCTL_PROC(_security_jail, OID_AUTO, mount_fdescfs_allowed, 3629 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3630 NULL, PR_ALLOW_MOUNT_FDESCFS, sysctl_jail_default_allow, "I", 3631 "Processes in jail can mount the fdescfs file system (deprecated)"); 3632 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed, 3633 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3634 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I", 3635 "Processes in jail can mount the nullfs file system (deprecated)"); 3636 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed, 3637 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3638 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I", 3639 "Processes in jail can mount the procfs file system (deprecated)"); 3640 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linprocfs_allowed, 3641 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3642 NULL, PR_ALLOW_MOUNT_LINPROCFS, sysctl_jail_default_allow, "I", 3643 "Processes in jail can mount the linprocfs file system (deprecated)"); 3644 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linsysfs_allowed, 3645 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3646 NULL, PR_ALLOW_MOUNT_LINSYSFS, sysctl_jail_default_allow, "I", 3647 "Processes in jail can mount the linsysfs file system (deprecated)"); 3648 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed, 3649 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3650 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I", 3651 "Processes in jail can mount the tmpfs file system (deprecated)"); 3652 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed, 3653 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3654 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I", 3655 "Processes in jail can mount the zfs file system (deprecated)"); 3656 3657 static int 3658 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 3659 { 3660 struct prison *pr; 3661 int level, error; 3662 3663 pr = req->td->td_ucred->cr_prison; 3664 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 3665 error = sysctl_handle_int(oidp, &level, 0, req); 3666 if (error || !req->newptr) 3667 return (error); 3668 *(int *)arg1 = level; 3669 return (0); 3670 } 3671 3672 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 3673 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3674 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 3675 sysctl_jail_default_level, "I", 3676 "Processes in jail cannot see all mounted file systems (deprecated)"); 3677 3678 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 3679 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 3680 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 3681 sysctl_jail_default_level, "I", 3682 "Ruleset for the devfs filesystem in jail (deprecated)"); 3683 3684 /* 3685 * Nodes to describe jail parameters. Maximum length of string parameters 3686 * is returned in the string itself, and the other parameters exist merely 3687 * to make themselves and their types known. 3688 */ 3689 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 3690 "Jail parameters"); 3691 3692 int 3693 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 3694 { 3695 int i; 3696 long l; 3697 size_t s; 3698 char numbuf[12]; 3699 3700 switch (oidp->oid_kind & CTLTYPE) 3701 { 3702 case CTLTYPE_LONG: 3703 case CTLTYPE_ULONG: 3704 l = 0; 3705 #ifdef SCTL_MASK32 3706 if (!(req->flags & SCTL_MASK32)) 3707 #endif 3708 return (SYSCTL_OUT(req, &l, sizeof(l))); 3709 case CTLTYPE_INT: 3710 case CTLTYPE_UINT: 3711 i = 0; 3712 return (SYSCTL_OUT(req, &i, sizeof(i))); 3713 case CTLTYPE_STRING: 3714 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 3715 return 3716 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 3717 case CTLTYPE_STRUCT: 3718 s = (size_t)arg2; 3719 return (SYSCTL_OUT(req, &s, sizeof(s))); 3720 } 3721 return (0); 3722 } 3723 3724 /* 3725 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 3726 * jail creation time but cannot be changed in an existing jail. 3727 */ 3728 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 3729 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 3730 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 3731 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 3732 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 3733 "I", "Jail secure level"); 3734 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 3735 "Jail value for kern.osreldate and uname -K"); 3736 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 3737 "Jail value for kern.osrelease and uname -r"); 3738 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 3739 "I", "Jail cannot see all mounted file systems"); 3740 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 3741 "I", "Ruleset for in-jail devfs mounts"); 3742 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 3743 "B", "Jail persistence"); 3744 #ifdef VIMAGE 3745 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 3746 "E,jailsys", "Virtual network stack"); 3747 #endif 3748 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 3749 "B", "Jail is in the process of shutting down"); 3750 3751 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 3752 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 3753 "I", "Current number of child jails"); 3754 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 3755 "I", "Maximum number of child jails"); 3756 3757 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 3758 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 3759 "Jail hostname"); 3760 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 3761 "Jail NIS domainname"); 3762 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 3763 "Jail host UUID"); 3764 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 3765 "LU", "Jail host ID"); 3766 3767 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 3768 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 3769 3770 #ifdef INET 3771 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 3772 "Jail IPv4 address virtualization"); 3773 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 3774 "S,in_addr,a", "Jail IPv4 addresses"); 3775 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3776 "B", "Do (not) use IPv4 source address selection rather than the " 3777 "primary jail IPv4 address."); 3778 #endif 3779 #ifdef INET6 3780 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 3781 "Jail IPv6 address virtualization"); 3782 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 3783 "S,in6_addr,a", "Jail IPv6 addresses"); 3784 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3785 "B", "Do (not) use IPv6 source address selection rather than the " 3786 "primary jail IPv6 address."); 3787 #endif 3788 3789 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 3790 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 3791 "B", "Jail may set hostname"); 3792 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 3793 "B", "Jail may use SYSV IPC"); 3794 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 3795 "B", "Jail may create raw sockets"); 3796 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 3797 "B", "Jail may alter system file flags"); 3798 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 3799 "B", "Jail may set file quotas"); 3800 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 3801 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 3802 SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW, 3803 "B", "Jail may bind sockets to reserved ports"); 3804 3805 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 3806 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 3807 "B", "Jail may mount/unmount jail-friendly file systems in general"); 3808 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW, 3809 "B", "Jail may mount the devfs file system"); 3810 SYSCTL_JAIL_PARAM(_allow_mount, fdescfs, CTLTYPE_INT | CTLFLAG_RW, 3811 "B", "Jail may mount the fdescfs file system"); 3812 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW, 3813 "B", "Jail may mount the nullfs file system"); 3814 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW, 3815 "B", "Jail may mount the procfs file system"); 3816 SYSCTL_JAIL_PARAM(_allow_mount, linprocfs, CTLTYPE_INT | CTLFLAG_RW, 3817 "B", "Jail may mount the linprocfs file system"); 3818 SYSCTL_JAIL_PARAM(_allow_mount, linsysfs, CTLTYPE_INT | CTLFLAG_RW, 3819 "B", "Jail may mount the linsysfs file system"); 3820 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW, 3821 "B", "Jail may mount the tmpfs file system"); 3822 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW, 3823 "B", "Jail may mount the zfs file system"); 3824 3825 #ifdef RACCT 3826 void 3827 prison_racct_foreach(void (*callback)(struct racct *racct, 3828 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 3829 void *arg2, void *arg3) 3830 { 3831 struct prison_racct *prr; 3832 3833 ASSERT_RACCT_ENABLED(); 3834 3835 sx_slock(&allprison_lock); 3836 if (pre != NULL) 3837 (pre)(); 3838 LIST_FOREACH(prr, &allprison_racct, prr_next) 3839 (callback)(prr->prr_racct, arg2, arg3); 3840 if (post != NULL) 3841 (post)(); 3842 sx_sunlock(&allprison_lock); 3843 } 3844 3845 static struct prison_racct * 3846 prison_racct_find_locked(const char *name) 3847 { 3848 struct prison_racct *prr; 3849 3850 ASSERT_RACCT_ENABLED(); 3851 sx_assert(&allprison_lock, SA_XLOCKED); 3852 3853 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 3854 return (NULL); 3855 3856 LIST_FOREACH(prr, &allprison_racct, prr_next) { 3857 if (strcmp(name, prr->prr_name) != 0) 3858 continue; 3859 3860 /* Found prison_racct with a matching name? */ 3861 prison_racct_hold(prr); 3862 return (prr); 3863 } 3864 3865 /* Add new prison_racct. */ 3866 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 3867 racct_create(&prr->prr_racct); 3868 3869 strcpy(prr->prr_name, name); 3870 refcount_init(&prr->prr_refcount, 1); 3871 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 3872 3873 return (prr); 3874 } 3875 3876 struct prison_racct * 3877 prison_racct_find(const char *name) 3878 { 3879 struct prison_racct *prr; 3880 3881 ASSERT_RACCT_ENABLED(); 3882 3883 sx_xlock(&allprison_lock); 3884 prr = prison_racct_find_locked(name); 3885 sx_xunlock(&allprison_lock); 3886 return (prr); 3887 } 3888 3889 void 3890 prison_racct_hold(struct prison_racct *prr) 3891 { 3892 3893 ASSERT_RACCT_ENABLED(); 3894 3895 refcount_acquire(&prr->prr_refcount); 3896 } 3897 3898 static void 3899 prison_racct_free_locked(struct prison_racct *prr) 3900 { 3901 3902 ASSERT_RACCT_ENABLED(); 3903 sx_assert(&allprison_lock, SA_XLOCKED); 3904 3905 if (refcount_release(&prr->prr_refcount)) { 3906 racct_destroy(&prr->prr_racct); 3907 LIST_REMOVE(prr, prr_next); 3908 free(prr, M_PRISON_RACCT); 3909 } 3910 } 3911 3912 void 3913 prison_racct_free(struct prison_racct *prr) 3914 { 3915 int old; 3916 3917 ASSERT_RACCT_ENABLED(); 3918 sx_assert(&allprison_lock, SA_UNLOCKED); 3919 3920 old = prr->prr_refcount; 3921 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 3922 return; 3923 3924 sx_xlock(&allprison_lock); 3925 prison_racct_free_locked(prr); 3926 sx_xunlock(&allprison_lock); 3927 } 3928 3929 static void 3930 prison_racct_attach(struct prison *pr) 3931 { 3932 struct prison_racct *prr; 3933 3934 ASSERT_RACCT_ENABLED(); 3935 sx_assert(&allprison_lock, SA_XLOCKED); 3936 3937 prr = prison_racct_find_locked(pr->pr_name); 3938 KASSERT(prr != NULL, ("cannot find prison_racct")); 3939 3940 pr->pr_prison_racct = prr; 3941 } 3942 3943 /* 3944 * Handle jail renaming. From the racct point of view, renaming means 3945 * moving from one prison_racct to another. 3946 */ 3947 static void 3948 prison_racct_modify(struct prison *pr) 3949 { 3950 struct proc *p; 3951 struct ucred *cred; 3952 struct prison_racct *oldprr; 3953 3954 ASSERT_RACCT_ENABLED(); 3955 3956 sx_slock(&allproc_lock); 3957 sx_xlock(&allprison_lock); 3958 3959 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 3960 sx_xunlock(&allprison_lock); 3961 sx_sunlock(&allproc_lock); 3962 return; 3963 } 3964 3965 oldprr = pr->pr_prison_racct; 3966 pr->pr_prison_racct = NULL; 3967 3968 prison_racct_attach(pr); 3969 3970 /* 3971 * Move resource utilisation records. 3972 */ 3973 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 3974 3975 /* 3976 * Force rctl to reattach rules to processes. 3977 */ 3978 FOREACH_PROC_IN_SYSTEM(p) { 3979 PROC_LOCK(p); 3980 cred = crhold(p->p_ucred); 3981 PROC_UNLOCK(p); 3982 racct_proc_ucred_changed(p, cred, cred); 3983 crfree(cred); 3984 } 3985 3986 sx_sunlock(&allproc_lock); 3987 prison_racct_free_locked(oldprr); 3988 sx_xunlock(&allprison_lock); 3989 } 3990 3991 static void 3992 prison_racct_detach(struct prison *pr) 3993 { 3994 3995 ASSERT_RACCT_ENABLED(); 3996 sx_assert(&allprison_lock, SA_UNLOCKED); 3997 3998 if (pr->pr_prison_racct == NULL) 3999 return; 4000 prison_racct_free(pr->pr_prison_racct); 4001 pr->pr_prison_racct = NULL; 4002 } 4003 #endif /* RACCT */ 4004 4005 #ifdef DDB 4006 4007 static void 4008 db_show_prison(struct prison *pr) 4009 { 4010 int fi; 4011 #if defined(INET) || defined(INET6) 4012 int ii; 4013 #endif 4014 unsigned jsf; 4015 #ifdef INET 4016 char ip4buf[INET_ADDRSTRLEN]; 4017 #endif 4018 #ifdef INET6 4019 char ip6buf[INET6_ADDRSTRLEN]; 4020 #endif 4021 4022 db_printf("prison %p:\n", pr); 4023 db_printf(" jid = %d\n", pr->pr_id); 4024 db_printf(" name = %s\n", pr->pr_name); 4025 db_printf(" parent = %p\n", pr->pr_parent); 4026 db_printf(" ref = %d\n", pr->pr_ref); 4027 db_printf(" uref = %d\n", pr->pr_uref); 4028 db_printf(" path = %s\n", pr->pr_path); 4029 db_printf(" cpuset = %d\n", pr->pr_cpuset 4030 ? pr->pr_cpuset->cs_id : -1); 4031 #ifdef VIMAGE 4032 db_printf(" vnet = %p\n", pr->pr_vnet); 4033 #endif 4034 db_printf(" root = %p\n", pr->pr_root); 4035 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4036 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4037 db_printf(" children.max = %d\n", pr->pr_childmax); 4038 db_printf(" children.cur = %d\n", pr->pr_childcount); 4039 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4040 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4041 db_printf(" flags = 0x%x", pr->pr_flags); 4042 for (fi = 0; fi < nitems(pr_flag_names); fi++) 4043 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4044 db_printf(" %s", pr_flag_names[fi]); 4045 for (fi = 0; fi < nitems(pr_flag_jailsys); fi++) { 4046 jsf = pr->pr_flags & 4047 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4048 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4049 pr_flag_jailsys[fi].disable && 4050 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4051 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4052 : "inherit"); 4053 } 4054 db_printf(" allow = 0x%x", pr->pr_allow); 4055 for (fi = 0; fi < nitems(pr_allow_names); fi++) 4056 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4057 db_printf(" %s", pr_allow_names[fi]); 4058 db_printf("\n"); 4059 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4060 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4061 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4062 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4063 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4064 #ifdef INET 4065 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4066 for (ii = 0; ii < pr->pr_ip4s; ii++) 4067 db_printf(" %s %s\n", 4068 ii == 0 ? "ip4.addr =" : " ", 4069 inet_ntoa_r(pr->pr_ip4[ii], ip4buf)); 4070 #endif 4071 #ifdef INET6 4072 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4073 for (ii = 0; ii < pr->pr_ip6s; ii++) 4074 db_printf(" %s %s\n", 4075 ii == 0 ? "ip6.addr =" : " ", 4076 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4077 #endif 4078 } 4079 4080 DB_SHOW_COMMAND(prison, db_show_prison_command) 4081 { 4082 struct prison *pr; 4083 4084 if (!have_addr) { 4085 /* 4086 * Show all prisons in the list, and prison0 which is not 4087 * listed. 4088 */ 4089 db_show_prison(&prison0); 4090 if (!db_pager_quit) { 4091 TAILQ_FOREACH(pr, &allprison, pr_list) { 4092 db_show_prison(pr); 4093 if (db_pager_quit) 4094 break; 4095 } 4096 } 4097 return; 4098 } 4099 4100 if (addr == 0) 4101 pr = &prison0; 4102 else { 4103 /* Look for a prison with the ID and with references. */ 4104 TAILQ_FOREACH(pr, &allprison, pr_list) 4105 if (pr->pr_id == addr && pr->pr_ref > 0) 4106 break; 4107 if (pr == NULL) 4108 /* Look again, without requiring a reference. */ 4109 TAILQ_FOREACH(pr, &allprison, pr_list) 4110 if (pr->pr_id == addr) 4111 break; 4112 if (pr == NULL) 4113 /* Assume address points to a valid prison. */ 4114 pr = (struct prison *)addr; 4115 } 4116 db_show_prison(pr); 4117 } 4118 4119 #endif /* DDB */ 4120