Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_jail.c
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1 /*- 2 * Copyright (c) 1999 Poul-Henning Kamp. 3 * Copyright (c) 2008 Bjoern A. Zeeb. 4 * Copyright (c) 2009 James Gritton. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD: releng/11.1/sys/kern/kern_jail.c 316943 2017-04-14 21:49:20Z smh $"); 31 32 #include "opt_compat.h" 33 #include "opt_ddb.h" 34 #include "opt_inet.h" 35 #include "opt_inet6.h" 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/kernel.h> 40 #include <sys/systm.h> 41 #include <sys/errno.h> 42 #include <sys/sysproto.h> 43 #include <sys/malloc.h> 44 #include <sys/osd.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/taskqueue.h> 48 #include <sys/fcntl.h> 49 #include <sys/jail.h> 50 #include <sys/lock.h> 51 #include <sys/mutex.h> 52 #include <sys/racct.h> 53 #include <sys/refcount.h> 54 #include <sys/sx.h> 55 #include <sys/sysent.h> 56 #include <sys/namei.h> 57 #include <sys/mount.h> 58 #include <sys/queue.h> 59 #include <sys/socket.h> 60 #include <sys/syscallsubr.h> 61 #include <sys/sysctl.h> 62 #include <sys/vnode.h> 63 64 #include <net/if.h> 65 #include <net/vnet.h> 66 67 #include <netinet/in.h> 68 69 #ifdef DDB 70 #include <ddb/ddb.h> 71 #endif /* DDB */ 72 73 #include <security/mac/mac_framework.h> 74 75 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 76 77 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 78 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 79 80 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 81 #ifdef INET 82 #ifdef INET6 83 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 84 #else 85 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 86 #endif 87 #else /* !INET */ 88 #ifdef INET6 89 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 90 #else 91 #define _PR_IP_SADDRSEL 0 92 #endif 93 #endif 94 95 /* prison0 describes what is "real" about the system. */ 96 struct prison prison0 = { 97 .pr_id = 0, 98 .pr_name = "", 99 .pr_ref = 1, 100 .pr_uref = 1, 101 .pr_path = "/", 102 .pr_securelevel = -1, 103 .pr_devfs_rsnum = 0, 104 .pr_childmax = JAIL_MAX, 105 .pr_hostuuid = DEFAULT_HOSTUUID, 106 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 107 #ifdef VIMAGE 108 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 109 #else 110 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 111 #endif 112 .pr_allow = PR_ALLOW_ALL, 113 }; 114 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 115 116 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 117 struct sx allprison_lock; 118 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 119 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 120 LIST_HEAD(, prison_racct) allprison_racct; 121 int lastprid = 0; 122 123 static int do_jail_attach(struct thread *td, struct prison *pr); 124 static void prison_complete(void *context, int pending); 125 static void prison_deref(struct prison *pr, int flags); 126 static char *prison_path(struct prison *pr1, struct prison *pr2); 127 static void prison_remove_one(struct prison *pr); 128 #ifdef RACCT 129 static void prison_racct_attach(struct prison *pr); 130 static void prison_racct_modify(struct prison *pr); 131 static void prison_racct_detach(struct prison *pr); 132 #endif 133 134 /* Flags for prison_deref */ 135 #define PD_DEREF 0x01 136 #define PD_DEUREF 0x02 137 #define PD_LOCKED 0x04 138 #define PD_LIST_SLOCKED 0x08 139 #define PD_LIST_XLOCKED 0x10 140 141 /* 142 * Parameter names corresponding to PR_* flag values. Size values are for kvm 143 * as we cannot figure out the size of a sparse array, or an array without a 144 * terminating entry. 145 */ 146 static char *pr_flag_names[] = { 147 [0] = "persist", 148 #ifdef INET 149 [7] = "ip4.saddrsel", 150 #endif 151 #ifdef INET6 152 [8] = "ip6.saddrsel", 153 #endif 154 }; 155 const size_t pr_flag_names_size = sizeof(pr_flag_names); 156 157 static char *pr_flag_nonames[] = { 158 [0] = "nopersist", 159 #ifdef INET 160 [7] = "ip4.nosaddrsel", 161 #endif 162 #ifdef INET6 163 [8] = "ip6.nosaddrsel", 164 #endif 165 }; 166 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames); 167 168 struct jailsys_flags { 169 const char *name; 170 unsigned disable; 171 unsigned new; 172 } pr_flag_jailsys[] = { 173 { "host", 0, PR_HOST }, 174 #ifdef VIMAGE 175 { "vnet", 0, PR_VNET }, 176 #endif 177 #ifdef INET 178 { "ip4", PR_IP4_USER, PR_IP4_USER }, 179 #endif 180 #ifdef INET6 181 { "ip6", PR_IP6_USER, PR_IP6_USER }, 182 #endif 183 }; 184 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 185 186 static char *pr_allow_names[] = { 187 "allow.set_hostname", 188 "allow.sysvipc", 189 "allow.raw_sockets", 190 "allow.chflags", 191 "allow.mount", 192 "allow.quotas", 193 "allow.socket_af", 194 "allow.mount.devfs", 195 "allow.mount.nullfs", 196 "allow.mount.zfs", 197 "allow.mount.procfs", 198 "allow.mount.tmpfs", 199 "allow.mount.fdescfs", 200 "allow.mount.linprocfs", 201 "allow.mount.linsysfs", 202 }; 203 const size_t pr_allow_names_size = sizeof(pr_allow_names); 204 205 static char *pr_allow_nonames[] = { 206 "allow.noset_hostname", 207 "allow.nosysvipc", 208 "allow.noraw_sockets", 209 "allow.nochflags", 210 "allow.nomount", 211 "allow.noquotas", 212 "allow.nosocket_af", 213 "allow.mount.nodevfs", 214 "allow.mount.nonullfs", 215 "allow.mount.nozfs", 216 "allow.mount.noprocfs", 217 "allow.mount.notmpfs", 218 "allow.mount.nofdescfs", 219 "allow.mount.nolinprocfs", 220 "allow.mount.nolinsysfs", 221 }; 222 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames); 223 224 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME 225 #define JAIL_DEFAULT_ENFORCE_STATFS 2 226 #define JAIL_DEFAULT_DEVFS_RSNUM 0 227 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 228 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 229 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 230 #if defined(INET) || defined(INET6) 231 static unsigned jail_max_af_ips = 255; 232 #endif 233 234 /* 235 * Initialize the parts of prison0 that can't be static-initialized with 236 * constants. This is called from proc0_init() after creating thread0 cpuset. 237 */ 238 void 239 prison0_init(void) 240 { 241 242 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 243 prison0.pr_osreldate = osreldate; 244 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 245 } 246 247 /* 248 * struct jail_args { 249 * struct jail *jail; 250 * }; 251 */ 252 int 253 sys_jail(struct thread *td, struct jail_args *uap) 254 { 255 uint32_t version; 256 int error; 257 struct jail j; 258 259 error = copyin(uap->jail, &version, sizeof(uint32_t)); 260 if (error) 261 return (error); 262 263 switch (version) { 264 case 0: 265 { 266 struct jail_v0 j0; 267 268 /* FreeBSD single IPv4 jails. */ 269 bzero(&j, sizeof(struct jail)); 270 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 271 if (error) 272 return (error); 273 j.version = j0.version; 274 j.path = j0.path; 275 j.hostname = j0.hostname; 276 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 277 break; 278 } 279 280 case 1: 281 /* 282 * Version 1 was used by multi-IPv4 jail implementations 283 * that never made it into the official kernel. 284 */ 285 return (EINVAL); 286 287 case 2: /* JAIL_API_VERSION */ 288 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 289 error = copyin(uap->jail, &j, sizeof(struct jail)); 290 if (error) 291 return (error); 292 break; 293 294 default: 295 /* Sci-Fi jails are not supported, sorry. */ 296 return (EINVAL); 297 } 298 return (kern_jail(td, &j)); 299 } 300 301 int 302 kern_jail(struct thread *td, struct jail *j) 303 { 304 struct iovec optiov[2 * (4 + nitems(pr_allow_names) 305 #ifdef INET 306 + 1 307 #endif 308 #ifdef INET6 309 + 1 310 #endif 311 )]; 312 struct uio opt; 313 char *u_path, *u_hostname, *u_name; 314 #ifdef INET 315 uint32_t ip4s; 316 struct in_addr *u_ip4; 317 #endif 318 #ifdef INET6 319 struct in6_addr *u_ip6; 320 #endif 321 size_t tmplen; 322 int error, enforce_statfs, fi; 323 324 bzero(&optiov, sizeof(optiov)); 325 opt.uio_iov = optiov; 326 opt.uio_iovcnt = 0; 327 opt.uio_offset = -1; 328 opt.uio_resid = -1; 329 opt.uio_segflg = UIO_SYSSPACE; 330 opt.uio_rw = UIO_READ; 331 opt.uio_td = td; 332 333 /* Set permissions for top-level jails from sysctls. */ 334 if (!jailed(td->td_ucred)) { 335 for (fi = 0; fi < nitems(pr_allow_names); fi++) { 336 optiov[opt.uio_iovcnt].iov_base = 337 (jail_default_allow & (1 << fi)) 338 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 339 optiov[opt.uio_iovcnt].iov_len = 340 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 341 opt.uio_iovcnt += 2; 342 } 343 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 344 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 345 opt.uio_iovcnt++; 346 enforce_statfs = jail_default_enforce_statfs; 347 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 348 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 349 opt.uio_iovcnt++; 350 } 351 352 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 353 #ifdef INET 354 ip4s = (j->version == 0) ? 1 : j->ip4s; 355 if (ip4s > jail_max_af_ips) 356 return (EINVAL); 357 tmplen += ip4s * sizeof(struct in_addr); 358 #else 359 if (j->ip4s > 0) 360 return (EINVAL); 361 #endif 362 #ifdef INET6 363 if (j->ip6s > jail_max_af_ips) 364 return (EINVAL); 365 tmplen += j->ip6s * sizeof(struct in6_addr); 366 #else 367 if (j->ip6s > 0) 368 return (EINVAL); 369 #endif 370 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 371 u_hostname = u_path + MAXPATHLEN; 372 u_name = u_hostname + MAXHOSTNAMELEN; 373 #ifdef INET 374 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 375 #endif 376 #ifdef INET6 377 #ifdef INET 378 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 379 #else 380 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 381 #endif 382 #endif 383 optiov[opt.uio_iovcnt].iov_base = "path"; 384 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 385 opt.uio_iovcnt++; 386 optiov[opt.uio_iovcnt].iov_base = u_path; 387 error = copyinstr(j->path, u_path, MAXPATHLEN, 388 &optiov[opt.uio_iovcnt].iov_len); 389 if (error) { 390 free(u_path, M_TEMP); 391 return (error); 392 } 393 opt.uio_iovcnt++; 394 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 395 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 396 opt.uio_iovcnt++; 397 optiov[opt.uio_iovcnt].iov_base = u_hostname; 398 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 399 &optiov[opt.uio_iovcnt].iov_len); 400 if (error) { 401 free(u_path, M_TEMP); 402 return (error); 403 } 404 opt.uio_iovcnt++; 405 if (j->jailname != NULL) { 406 optiov[opt.uio_iovcnt].iov_base = "name"; 407 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 408 opt.uio_iovcnt++; 409 optiov[opt.uio_iovcnt].iov_base = u_name; 410 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 411 &optiov[opt.uio_iovcnt].iov_len); 412 if (error) { 413 free(u_path, M_TEMP); 414 return (error); 415 } 416 opt.uio_iovcnt++; 417 } 418 #ifdef INET 419 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 420 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 421 opt.uio_iovcnt++; 422 optiov[opt.uio_iovcnt].iov_base = u_ip4; 423 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 424 if (j->version == 0) 425 u_ip4->s_addr = j->ip4s; 426 else { 427 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 428 if (error) { 429 free(u_path, M_TEMP); 430 return (error); 431 } 432 } 433 opt.uio_iovcnt++; 434 #endif 435 #ifdef INET6 436 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 437 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 438 opt.uio_iovcnt++; 439 optiov[opt.uio_iovcnt].iov_base = u_ip6; 440 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 441 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 442 if (error) { 443 free(u_path, M_TEMP); 444 return (error); 445 } 446 opt.uio_iovcnt++; 447 #endif 448 KASSERT(opt.uio_iovcnt <= nitems(optiov), 449 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 450 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 451 free(u_path, M_TEMP); 452 return (error); 453 } 454 455 456 /* 457 * struct jail_set_args { 458 * struct iovec *iovp; 459 * unsigned int iovcnt; 460 * int flags; 461 * }; 462 */ 463 int 464 sys_jail_set(struct thread *td, struct jail_set_args *uap) 465 { 466 struct uio *auio; 467 int error; 468 469 /* Check that we have an even number of iovecs. */ 470 if (uap->iovcnt & 1) 471 return (EINVAL); 472 473 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 474 if (error) 475 return (error); 476 error = kern_jail_set(td, auio, uap->flags); 477 free(auio, M_IOV); 478 return (error); 479 } 480 481 int 482 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 483 { 484 struct nameidata nd; 485 #ifdef INET 486 struct in_addr *ip4; 487 #endif 488 #ifdef INET6 489 struct in6_addr *ip6; 490 #endif 491 struct vfsopt *opt; 492 struct vfsoptlist *opts; 493 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 494 struct vnode *root; 495 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 496 char *g_path, *osrelstr; 497 #if defined(INET) || defined(INET6) 498 struct prison *tppr; 499 void *op; 500 #endif 501 unsigned long hid; 502 size_t namelen, onamelen, pnamelen; 503 int born, created, cuflags, descend, enforce; 504 int error, errmsg_len, errmsg_pos; 505 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 506 int fi, jid, jsys, len, level; 507 int childmax, osreldt, rsnum, slevel; 508 int fullpath_disabled; 509 #if defined(INET) || defined(INET6) 510 int ii, ij; 511 #endif 512 #ifdef INET 513 int ip4s, redo_ip4; 514 #endif 515 #ifdef INET6 516 int ip6s, redo_ip6; 517 #endif 518 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 519 unsigned tallow; 520 char numbuf[12]; 521 522 error = priv_check(td, PRIV_JAIL_SET); 523 if (!error && (flags & JAIL_ATTACH)) 524 error = priv_check(td, PRIV_JAIL_ATTACH); 525 if (error) 526 return (error); 527 mypr = td->td_ucred->cr_prison; 528 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 529 return (EPERM); 530 if (flags & ~JAIL_SET_MASK) 531 return (EINVAL); 532 533 /* 534 * Check all the parameters before committing to anything. Not all 535 * errors can be caught early, but we may as well try. Also, this 536 * takes care of some expensive stuff (path lookup) before getting 537 * the allprison lock. 538 * 539 * XXX Jails are not filesystems, and jail parameters are not mount 540 * options. But it makes more sense to re-use the vfsopt code 541 * than duplicate it under a different name. 542 */ 543 error = vfs_buildopts(optuio, &opts); 544 if (error) 545 return (error); 546 #ifdef INET 547 ip4 = NULL; 548 #endif 549 #ifdef INET6 550 ip6 = NULL; 551 #endif 552 g_path = NULL; 553 554 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 555 if (!cuflags) { 556 error = EINVAL; 557 vfs_opterror(opts, "no valid operation (create or update)"); 558 goto done_errmsg; 559 } 560 561 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 562 if (error == ENOENT) 563 jid = 0; 564 else if (error != 0) 565 goto done_free; 566 567 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 568 if (error == ENOENT) 569 gotslevel = 0; 570 else if (error != 0) 571 goto done_free; 572 else 573 gotslevel = 1; 574 575 error = 576 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 577 if (error == ENOENT) 578 gotchildmax = 0; 579 else if (error != 0) 580 goto done_free; 581 else 582 gotchildmax = 1; 583 584 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 585 if (error == ENOENT) 586 gotenforce = 0; 587 else if (error != 0) 588 goto done_free; 589 else if (enforce < 0 || enforce > 2) { 590 error = EINVAL; 591 goto done_free; 592 } else 593 gotenforce = 1; 594 595 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 596 if (error == ENOENT) 597 gotrsnum = 0; 598 else if (error != 0) 599 goto done_free; 600 else 601 gotrsnum = 1; 602 603 pr_flags = ch_flags = 0; 604 for (fi = 0; fi < nitems(pr_flag_names); fi++) { 605 if (pr_flag_names[fi] == NULL) 606 continue; 607 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 608 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 609 } 610 ch_flags |= pr_flags; 611 for (fi = 0; fi < nitems(pr_flag_jailsys); fi++) { 612 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys, 613 sizeof(jsys)); 614 if (error == ENOENT) 615 continue; 616 if (error != 0) 617 goto done_free; 618 switch (jsys) { 619 case JAIL_SYS_DISABLE: 620 if (!pr_flag_jailsys[fi].disable) { 621 error = EINVAL; 622 goto done_free; 623 } 624 pr_flags |= pr_flag_jailsys[fi].disable; 625 break; 626 case JAIL_SYS_NEW: 627 pr_flags |= pr_flag_jailsys[fi].new; 628 break; 629 case JAIL_SYS_INHERIT: 630 break; 631 default: 632 error = EINVAL; 633 goto done_free; 634 } 635 ch_flags |= 636 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable; 637 } 638 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 639 && !(pr_flags & PR_PERSIST)) { 640 error = EINVAL; 641 vfs_opterror(opts, "new jail must persist or attach"); 642 goto done_errmsg; 643 } 644 #ifdef VIMAGE 645 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 646 error = EINVAL; 647 vfs_opterror(opts, "vnet cannot be changed after creation"); 648 goto done_errmsg; 649 } 650 #endif 651 #ifdef INET 652 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 653 error = EINVAL; 654 vfs_opterror(opts, "ip4 cannot be changed after creation"); 655 goto done_errmsg; 656 } 657 #endif 658 #ifdef INET6 659 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 660 error = EINVAL; 661 vfs_opterror(opts, "ip6 cannot be changed after creation"); 662 goto done_errmsg; 663 } 664 #endif 665 666 pr_allow = ch_allow = 0; 667 for (fi = 0; fi < nitems(pr_allow_names); fi++) { 668 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 669 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 670 } 671 ch_allow |= pr_allow; 672 673 error = vfs_getopt(opts, "name", (void **)&name, &len); 674 if (error == ENOENT) 675 name = NULL; 676 else if (error != 0) 677 goto done_free; 678 else { 679 if (len == 0 || name[len - 1] != '\0') { 680 error = EINVAL; 681 goto done_free; 682 } 683 if (len > MAXHOSTNAMELEN) { 684 error = ENAMETOOLONG; 685 goto done_free; 686 } 687 } 688 689 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 690 if (error == ENOENT) 691 host = NULL; 692 else if (error != 0) 693 goto done_free; 694 else { 695 ch_flags |= PR_HOST; 696 pr_flags |= PR_HOST; 697 if (len == 0 || host[len - 1] != '\0') { 698 error = EINVAL; 699 goto done_free; 700 } 701 if (len > MAXHOSTNAMELEN) { 702 error = ENAMETOOLONG; 703 goto done_free; 704 } 705 } 706 707 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 708 if (error == ENOENT) 709 domain = NULL; 710 else if (error != 0) 711 goto done_free; 712 else { 713 ch_flags |= PR_HOST; 714 pr_flags |= PR_HOST; 715 if (len == 0 || domain[len - 1] != '\0') { 716 error = EINVAL; 717 goto done_free; 718 } 719 if (len > MAXHOSTNAMELEN) { 720 error = ENAMETOOLONG; 721 goto done_free; 722 } 723 } 724 725 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 726 if (error == ENOENT) 727 uuid = NULL; 728 else if (error != 0) 729 goto done_free; 730 else { 731 ch_flags |= PR_HOST; 732 pr_flags |= PR_HOST; 733 if (len == 0 || uuid[len - 1] != '\0') { 734 error = EINVAL; 735 goto done_free; 736 } 737 if (len > HOSTUUIDLEN) { 738 error = ENAMETOOLONG; 739 goto done_free; 740 } 741 } 742 743 #ifdef COMPAT_FREEBSD32 744 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 745 uint32_t hid32; 746 747 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 748 hid = hid32; 749 } else 750 #endif 751 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 752 if (error == ENOENT) 753 gothid = 0; 754 else if (error != 0) 755 goto done_free; 756 else { 757 gothid = 1; 758 ch_flags |= PR_HOST; 759 pr_flags |= PR_HOST; 760 } 761 762 #ifdef INET 763 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 764 if (error == ENOENT) 765 ip4s = 0; 766 else if (error != 0) 767 goto done_free; 768 else if (ip4s & (sizeof(*ip4) - 1)) { 769 error = EINVAL; 770 goto done_free; 771 } else { 772 ch_flags |= PR_IP4_USER; 773 pr_flags |= PR_IP4_USER; 774 if (ip4s > 0) { 775 ip4s /= sizeof(*ip4); 776 if (ip4s > jail_max_af_ips) { 777 error = EINVAL; 778 vfs_opterror(opts, "too many IPv4 addresses"); 779 goto done_errmsg; 780 } 781 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 782 bcopy(op, ip4, ip4s * sizeof(*ip4)); 783 /* 784 * IP addresses are all sorted but ip[0] to preserve 785 * the primary IP address as given from userland. 786 * This special IP is used for unbound outgoing 787 * connections as well for "loopback" traffic in case 788 * source address selection cannot find any more fitting 789 * address to connect from. 790 */ 791 if (ip4s > 1) 792 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), 793 prison_qcmp_v4); 794 /* 795 * Check for duplicate addresses and do some simple 796 * zero and broadcast checks. If users give other bogus 797 * addresses it is their problem. 798 * 799 * We do not have to care about byte order for these 800 * checks so we will do them in NBO. 801 */ 802 for (ii = 0; ii < ip4s; ii++) { 803 if (ip4[ii].s_addr == INADDR_ANY || 804 ip4[ii].s_addr == INADDR_BROADCAST) { 805 error = EINVAL; 806 goto done_free; 807 } 808 if ((ii+1) < ip4s && 809 (ip4[0].s_addr == ip4[ii+1].s_addr || 810 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 811 error = EINVAL; 812 goto done_free; 813 } 814 } 815 } 816 } 817 #endif 818 819 #ifdef INET6 820 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 821 if (error == ENOENT) 822 ip6s = 0; 823 else if (error != 0) 824 goto done_free; 825 else if (ip6s & (sizeof(*ip6) - 1)) { 826 error = EINVAL; 827 goto done_free; 828 } else { 829 ch_flags |= PR_IP6_USER; 830 pr_flags |= PR_IP6_USER; 831 if (ip6s > 0) { 832 ip6s /= sizeof(*ip6); 833 if (ip6s > jail_max_af_ips) { 834 error = EINVAL; 835 vfs_opterror(opts, "too many IPv6 addresses"); 836 goto done_errmsg; 837 } 838 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 839 bcopy(op, ip6, ip6s * sizeof(*ip6)); 840 if (ip6s > 1) 841 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), 842 prison_qcmp_v6); 843 for (ii = 0; ii < ip6s; ii++) { 844 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 845 error = EINVAL; 846 goto done_free; 847 } 848 if ((ii+1) < ip6s && 849 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 850 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 851 { 852 error = EINVAL; 853 goto done_free; 854 } 855 } 856 } 857 } 858 #endif 859 860 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 861 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 862 error = EINVAL; 863 vfs_opterror(opts, 864 "vnet jails cannot have IP address restrictions"); 865 goto done_errmsg; 866 } 867 #endif 868 869 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 870 if (error == ENOENT) 871 osrelstr = NULL; 872 else if (error != 0) 873 goto done_free; 874 else { 875 if (flags & JAIL_UPDATE) { 876 error = EINVAL; 877 vfs_opterror(opts, 878 "osrelease cannot be changed after creation"); 879 goto done_errmsg; 880 } 881 if (len == 0 || len >= OSRELEASELEN) { 882 error = EINVAL; 883 vfs_opterror(opts, 884 "osrelease string must be 1-%d bytes long", 885 OSRELEASELEN - 1); 886 goto done_errmsg; 887 } 888 } 889 890 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 891 if (error == ENOENT) 892 osreldt = 0; 893 else if (error != 0) 894 goto done_free; 895 else { 896 if (flags & JAIL_UPDATE) { 897 error = EINVAL; 898 vfs_opterror(opts, 899 "osreldate cannot be changed after creation"); 900 goto done_errmsg; 901 } 902 if (osreldt == 0) { 903 error = EINVAL; 904 vfs_opterror(opts, "osreldate cannot be 0"); 905 goto done_errmsg; 906 } 907 } 908 909 fullpath_disabled = 0; 910 root = NULL; 911 error = vfs_getopt(opts, "path", (void **)&path, &len); 912 if (error == ENOENT) 913 path = NULL; 914 else if (error != 0) 915 goto done_free; 916 else { 917 if (flags & JAIL_UPDATE) { 918 error = EINVAL; 919 vfs_opterror(opts, 920 "path cannot be changed after creation"); 921 goto done_errmsg; 922 } 923 if (len == 0 || path[len - 1] != '\0') { 924 error = EINVAL; 925 goto done_free; 926 } 927 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 928 path, td); 929 error = namei(&nd); 930 if (error) 931 goto done_free; 932 root = nd.ni_vp; 933 NDFREE(&nd, NDF_ONLY_PNBUF); 934 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 935 strlcpy(g_path, path, MAXPATHLEN); 936 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 937 if (error == 0) 938 path = g_path; 939 else if (error == ENODEV) { 940 /* proceed if sysctl debug.disablefullpath == 1 */ 941 fullpath_disabled = 1; 942 if (len < 2 || (len == 2 && path[0] == '/')) 943 path = NULL; 944 } else { 945 /* exit on other errors */ 946 goto done_free; 947 } 948 if (root->v_type != VDIR) { 949 error = ENOTDIR; 950 vput(root); 951 goto done_free; 952 } 953 VOP_UNLOCK(root, 0); 954 if (fullpath_disabled) { 955 /* Leave room for a real-root full pathname. */ 956 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 957 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 958 error = ENAMETOOLONG; 959 vrele(root); 960 goto done_free; 961 } 962 } 963 } 964 965 /* 966 * Find the specified jail, or at least its parent. 967 * This abuses the file error codes ENOENT and EEXIST. 968 */ 969 pr = NULL; 970 ppr = mypr; 971 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 972 namelc = strrchr(name, '.'); 973 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 974 if (*p != '\0') 975 jid = 0; 976 } 977 sx_xlock(&allprison_lock); 978 if (jid != 0) { 979 /* 980 * See if a requested jid already exists. There is an 981 * information leak here if the jid exists but is not within 982 * the caller's jail hierarchy. Jail creators will get EEXIST 983 * even though they cannot see the jail, and CREATE | UPDATE 984 * will return ENOENT which is not normally a valid error. 985 */ 986 if (jid < 0) { 987 error = EINVAL; 988 vfs_opterror(opts, "negative jid"); 989 goto done_unlock_list; 990 } 991 pr = prison_find(jid); 992 if (pr != NULL) { 993 ppr = pr->pr_parent; 994 /* Create: jid must not exist. */ 995 if (cuflags == JAIL_CREATE) { 996 mtx_unlock(&pr->pr_mtx); 997 error = EEXIST; 998 vfs_opterror(opts, "jail %d already exists", 999 jid); 1000 goto done_unlock_list; 1001 } 1002 if (!prison_ischild(mypr, pr)) { 1003 mtx_unlock(&pr->pr_mtx); 1004 pr = NULL; 1005 } else if (pr->pr_uref == 0) { 1006 if (!(flags & JAIL_DYING)) { 1007 mtx_unlock(&pr->pr_mtx); 1008 error = ENOENT; 1009 vfs_opterror(opts, "jail %d is dying", 1010 jid); 1011 goto done_unlock_list; 1012 } else if ((flags & JAIL_ATTACH) || 1013 (pr_flags & PR_PERSIST)) { 1014 /* 1015 * A dying jail might be resurrected 1016 * (via attach or persist), but first 1017 * it must determine if another jail 1018 * has claimed its name. Accomplish 1019 * this by implicitly re-setting the 1020 * name. 1021 */ 1022 if (name == NULL) 1023 name = prison_name(mypr, pr); 1024 } 1025 } 1026 } 1027 if (pr == NULL) { 1028 /* Update: jid must exist. */ 1029 if (cuflags == JAIL_UPDATE) { 1030 error = ENOENT; 1031 vfs_opterror(opts, "jail %d not found", jid); 1032 goto done_unlock_list; 1033 } 1034 } 1035 } 1036 /* 1037 * If the caller provided a name, look for a jail by that name. 1038 * This has different semantics for creates and updates keyed by jid 1039 * (where the name must not already exist in a different jail), 1040 * and updates keyed by the name itself (where the name must exist 1041 * because that is the jail being updated). 1042 */ 1043 namelc = NULL; 1044 if (name != NULL) { 1045 namelc = strrchr(name, '.'); 1046 if (namelc == NULL) 1047 namelc = name; 1048 else { 1049 /* 1050 * This is a hierarchical name. Split it into the 1051 * parent and child names, and make sure the parent 1052 * exists or matches an already found jail. 1053 */ 1054 if (pr != NULL) { 1055 if (strncmp(name, ppr->pr_name, namelc - name) 1056 || ppr->pr_name[namelc - name] != '\0') { 1057 mtx_unlock(&pr->pr_mtx); 1058 error = EINVAL; 1059 vfs_opterror(opts, 1060 "cannot change jail's parent"); 1061 goto done_unlock_list; 1062 } 1063 } else { 1064 *namelc = '\0'; 1065 ppr = prison_find_name(mypr, name); 1066 if (ppr == NULL) { 1067 error = ENOENT; 1068 vfs_opterror(opts, 1069 "jail \"%s\" not found", name); 1070 goto done_unlock_list; 1071 } 1072 mtx_unlock(&ppr->pr_mtx); 1073 *namelc = '.'; 1074 } 1075 namelc++; 1076 } 1077 if (namelc[0] != '\0') { 1078 pnamelen = 1079 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1080 name_again: 1081 deadpr = NULL; 1082 FOREACH_PRISON_CHILD(ppr, tpr) { 1083 if (tpr != pr && tpr->pr_ref > 0 && 1084 !strcmp(tpr->pr_name + pnamelen, namelc)) { 1085 if (pr == NULL && 1086 cuflags != JAIL_CREATE) { 1087 mtx_lock(&tpr->pr_mtx); 1088 if (tpr->pr_ref > 0) { 1089 /* 1090 * Use this jail 1091 * for updates. 1092 */ 1093 if (tpr->pr_uref > 0) { 1094 pr = tpr; 1095 break; 1096 } 1097 deadpr = tpr; 1098 } 1099 mtx_unlock(&tpr->pr_mtx); 1100 } else if (tpr->pr_uref > 0) { 1101 /* 1102 * Create, or update(jid): 1103 * name must not exist in an 1104 * active sibling jail. 1105 */ 1106 error = EEXIST; 1107 if (pr != NULL) 1108 mtx_unlock(&pr->pr_mtx); 1109 vfs_opterror(opts, 1110 "jail \"%s\" already exists", 1111 name); 1112 goto done_unlock_list; 1113 } 1114 } 1115 } 1116 /* If no active jail is found, use a dying one. */ 1117 if (deadpr != NULL && pr == NULL) { 1118 if (flags & JAIL_DYING) { 1119 mtx_lock(&deadpr->pr_mtx); 1120 if (deadpr->pr_ref == 0) { 1121 mtx_unlock(&deadpr->pr_mtx); 1122 goto name_again; 1123 } 1124 pr = deadpr; 1125 } else if (cuflags == JAIL_UPDATE) { 1126 error = ENOENT; 1127 vfs_opterror(opts, 1128 "jail \"%s\" is dying", name); 1129 goto done_unlock_list; 1130 } 1131 } 1132 /* Update: name must exist if no jid. */ 1133 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1134 error = ENOENT; 1135 vfs_opterror(opts, "jail \"%s\" not found", 1136 name); 1137 goto done_unlock_list; 1138 } 1139 } 1140 } 1141 /* Update: must provide a jid or name. */ 1142 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1143 error = ENOENT; 1144 vfs_opterror(opts, "update specified no jail"); 1145 goto done_unlock_list; 1146 } 1147 1148 /* If there's no prison to update, create a new one and link it in. */ 1149 if (pr == NULL) { 1150 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1151 if (tpr->pr_childcount >= tpr->pr_childmax) { 1152 error = EPERM; 1153 vfs_opterror(opts, "prison limit exceeded"); 1154 goto done_unlock_list; 1155 } 1156 created = 1; 1157 mtx_lock(&ppr->pr_mtx); 1158 if (ppr->pr_ref == 0) { 1159 mtx_unlock(&ppr->pr_mtx); 1160 error = ENOENT; 1161 vfs_opterror(opts, "jail \"%s\" not found", 1162 prison_name(mypr, ppr)); 1163 goto done_unlock_list; 1164 } 1165 ppr->pr_ref++; 1166 ppr->pr_uref++; 1167 mtx_unlock(&ppr->pr_mtx); 1168 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1169 if (jid == 0) { 1170 /* Find the next free jid. */ 1171 jid = lastprid + 1; 1172 findnext: 1173 if (jid == JAIL_MAX) 1174 jid = 1; 1175 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1176 if (tpr->pr_id < jid) 1177 continue; 1178 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1179 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1180 break; 1181 } 1182 if (jid == lastprid) { 1183 error = EAGAIN; 1184 vfs_opterror(opts, 1185 "no available jail IDs"); 1186 free(pr, M_PRISON); 1187 prison_deref(ppr, PD_DEREF | 1188 PD_DEUREF | PD_LIST_XLOCKED); 1189 goto done_releroot; 1190 } 1191 jid++; 1192 goto findnext; 1193 } 1194 lastprid = jid; 1195 } else { 1196 /* 1197 * The jail already has a jid (that did not yet exist), 1198 * so just find where to insert it. 1199 */ 1200 TAILQ_FOREACH(tpr, &allprison, pr_list) 1201 if (tpr->pr_id >= jid) { 1202 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1203 break; 1204 } 1205 } 1206 if (tpr == NULL) 1207 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1208 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1209 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1210 tpr->pr_childcount++; 1211 1212 pr->pr_parent = ppr; 1213 pr->pr_id = jid; 1214 1215 /* Set some default values, and inherit some from the parent. */ 1216 if (namelc == NULL) 1217 namelc = ""; 1218 if (path == NULL) { 1219 path = "/"; 1220 root = mypr->pr_root; 1221 vref(root); 1222 } 1223 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1224 pr->pr_flags |= PR_HOST; 1225 #if defined(INET) || defined(INET6) 1226 #ifdef VIMAGE 1227 if (!(pr_flags & PR_VNET)) 1228 #endif 1229 { 1230 #ifdef INET 1231 if (!(ch_flags & PR_IP4_USER)) 1232 pr->pr_flags |= PR_IP4 | PR_IP4_USER; 1233 else if (!(pr_flags & PR_IP4_USER)) { 1234 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1235 if (ppr->pr_ip4 != NULL) { 1236 pr->pr_ip4s = ppr->pr_ip4s; 1237 pr->pr_ip4 = malloc(pr->pr_ip4s * 1238 sizeof(struct in_addr), M_PRISON, 1239 M_WAITOK); 1240 bcopy(ppr->pr_ip4, pr->pr_ip4, 1241 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1242 } 1243 } 1244 #endif 1245 #ifdef INET6 1246 if (!(ch_flags & PR_IP6_USER)) 1247 pr->pr_flags |= PR_IP6 | PR_IP6_USER; 1248 else if (!(pr_flags & PR_IP6_USER)) { 1249 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1250 if (ppr->pr_ip6 != NULL) { 1251 pr->pr_ip6s = ppr->pr_ip6s; 1252 pr->pr_ip6 = malloc(pr->pr_ip6s * 1253 sizeof(struct in6_addr), M_PRISON, 1254 M_WAITOK); 1255 bcopy(ppr->pr_ip6, pr->pr_ip6, 1256 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1257 } 1258 } 1259 #endif 1260 } 1261 #endif 1262 /* Source address selection is always on by default. */ 1263 pr->pr_flags |= _PR_IP_SADDRSEL; 1264 1265 pr->pr_securelevel = ppr->pr_securelevel; 1266 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1267 pr->pr_enforce_statfs = jail_default_enforce_statfs; 1268 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1269 1270 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1271 if (osrelstr == NULL) 1272 strcpy(pr->pr_osrelease, ppr->pr_osrelease); 1273 else 1274 strcpy(pr->pr_osrelease, osrelstr); 1275 1276 LIST_INIT(&pr->pr_children); 1277 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1278 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 1279 1280 #ifdef VIMAGE 1281 /* Allocate a new vnet if specified. */ 1282 pr->pr_vnet = (pr_flags & PR_VNET) 1283 ? vnet_alloc() : ppr->pr_vnet; 1284 #endif 1285 /* 1286 * Allocate a dedicated cpuset for each jail. 1287 * Unlike other initial settings, this may return an erorr. 1288 */ 1289 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1290 if (error) { 1291 prison_deref(pr, PD_LIST_XLOCKED); 1292 goto done_releroot; 1293 } 1294 1295 mtx_lock(&pr->pr_mtx); 1296 /* 1297 * New prisons do not yet have a reference, because we do not 1298 * want others to see the incomplete prison once the 1299 * allprison_lock is downgraded. 1300 */ 1301 } else { 1302 created = 0; 1303 /* 1304 * Grab a reference for existing prisons, to ensure they 1305 * continue to exist for the duration of the call. 1306 */ 1307 pr->pr_ref++; 1308 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1309 if ((pr->pr_flags & PR_VNET) && 1310 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1311 error = EINVAL; 1312 vfs_opterror(opts, 1313 "vnet jails cannot have IP address restrictions"); 1314 goto done_deref_locked; 1315 } 1316 #endif 1317 #ifdef INET 1318 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1319 error = EINVAL; 1320 vfs_opterror(opts, 1321 "ip4 cannot be changed after creation"); 1322 goto done_deref_locked; 1323 } 1324 #endif 1325 #ifdef INET6 1326 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1327 error = EINVAL; 1328 vfs_opterror(opts, 1329 "ip6 cannot be changed after creation"); 1330 goto done_deref_locked; 1331 } 1332 #endif 1333 } 1334 1335 /* Do final error checking before setting anything. */ 1336 if (gotslevel) { 1337 if (slevel < ppr->pr_securelevel) { 1338 error = EPERM; 1339 goto done_deref_locked; 1340 } 1341 } 1342 if (gotchildmax) { 1343 if (childmax >= ppr->pr_childmax) { 1344 error = EPERM; 1345 goto done_deref_locked; 1346 } 1347 } 1348 if (gotenforce) { 1349 if (enforce < ppr->pr_enforce_statfs) { 1350 error = EPERM; 1351 goto done_deref_locked; 1352 } 1353 } 1354 if (gotrsnum) { 1355 /* 1356 * devfs_rsnum is a uint16_t 1357 */ 1358 if (rsnum < 0 || rsnum > 65535) { 1359 error = EINVAL; 1360 goto done_deref_locked; 1361 } 1362 /* 1363 * Nested jails always inherit parent's devfs ruleset 1364 */ 1365 if (jailed(td->td_ucred)) { 1366 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1367 error = EPERM; 1368 goto done_deref_locked; 1369 } else 1370 rsnum = ppr->pr_devfs_rsnum; 1371 } 1372 } 1373 #ifdef INET 1374 if (ip4s > 0) { 1375 if (ppr->pr_flags & PR_IP4) { 1376 /* 1377 * Make sure the new set of IP addresses is a 1378 * subset of the parent's list. Don't worry 1379 * about the parent being unlocked, as any 1380 * setting is done with allprison_lock held. 1381 */ 1382 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1383 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1384 break; 1385 if (ij == ppr->pr_ip4s) { 1386 error = EPERM; 1387 goto done_deref_locked; 1388 } 1389 if (ip4s > 1) { 1390 for (ii = ij = 1; ii < ip4s; ii++) { 1391 if (ip4[ii].s_addr == 1392 ppr->pr_ip4[0].s_addr) 1393 continue; 1394 for (; ij < ppr->pr_ip4s; ij++) 1395 if (ip4[ii].s_addr == 1396 ppr->pr_ip4[ij].s_addr) 1397 break; 1398 if (ij == ppr->pr_ip4s) 1399 break; 1400 } 1401 if (ij == ppr->pr_ip4s) { 1402 error = EPERM; 1403 goto done_deref_locked; 1404 } 1405 } 1406 } 1407 /* 1408 * Check for conflicting IP addresses. We permit them 1409 * if there is no more than one IP on each jail. If 1410 * there is a duplicate on a jail with more than one 1411 * IP stop checking and return error. 1412 */ 1413 tppr = ppr; 1414 #ifdef VIMAGE 1415 for (; tppr != &prison0; tppr = tppr->pr_parent) 1416 if (tppr->pr_flags & PR_VNET) 1417 break; 1418 #endif 1419 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1420 if (tpr == pr || 1421 #ifdef VIMAGE 1422 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1423 #endif 1424 tpr->pr_uref == 0) { 1425 descend = 0; 1426 continue; 1427 } 1428 if (!(tpr->pr_flags & PR_IP4_USER)) 1429 continue; 1430 descend = 0; 1431 if (tpr->pr_ip4 == NULL || 1432 (ip4s == 1 && tpr->pr_ip4s == 1)) 1433 continue; 1434 for (ii = 0; ii < ip4s; ii++) { 1435 if (prison_check_ip4_locked(tpr, &ip4[ii]) == 1436 0) { 1437 error = EADDRINUSE; 1438 vfs_opterror(opts, 1439 "IPv4 addresses clash"); 1440 goto done_deref_locked; 1441 } 1442 } 1443 } 1444 } 1445 #endif 1446 #ifdef INET6 1447 if (ip6s > 0) { 1448 if (ppr->pr_flags & PR_IP6) { 1449 /* 1450 * Make sure the new set of IP addresses is a 1451 * subset of the parent's list. 1452 */ 1453 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1454 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1455 &ppr->pr_ip6[ij])) 1456 break; 1457 if (ij == ppr->pr_ip6s) { 1458 error = EPERM; 1459 goto done_deref_locked; 1460 } 1461 if (ip6s > 1) { 1462 for (ii = ij = 1; ii < ip6s; ii++) { 1463 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1464 &ppr->pr_ip6[0])) 1465 continue; 1466 for (; ij < ppr->pr_ip6s; ij++) 1467 if (IN6_ARE_ADDR_EQUAL( 1468 &ip6[ii], &ppr->pr_ip6[ij])) 1469 break; 1470 if (ij == ppr->pr_ip6s) 1471 break; 1472 } 1473 if (ij == ppr->pr_ip6s) { 1474 error = EPERM; 1475 goto done_deref_locked; 1476 } 1477 } 1478 } 1479 /* Check for conflicting IP addresses. */ 1480 tppr = ppr; 1481 #ifdef VIMAGE 1482 for (; tppr != &prison0; tppr = tppr->pr_parent) 1483 if (tppr->pr_flags & PR_VNET) 1484 break; 1485 #endif 1486 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1487 if (tpr == pr || 1488 #ifdef VIMAGE 1489 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1490 #endif 1491 tpr->pr_uref == 0) { 1492 descend = 0; 1493 continue; 1494 } 1495 if (!(tpr->pr_flags & PR_IP6_USER)) 1496 continue; 1497 descend = 0; 1498 if (tpr->pr_ip6 == NULL || 1499 (ip6s == 1 && tpr->pr_ip6s == 1)) 1500 continue; 1501 for (ii = 0; ii < ip6s; ii++) { 1502 if (prison_check_ip6_locked(tpr, &ip6[ii]) == 1503 0) { 1504 error = EADDRINUSE; 1505 vfs_opterror(opts, 1506 "IPv6 addresses clash"); 1507 goto done_deref_locked; 1508 } 1509 } 1510 } 1511 } 1512 #endif 1513 onamelen = namelen = 0; 1514 if (namelc != NULL) { 1515 /* Give a default name of the jid. Also allow the name to be 1516 * explicitly the jid - but not any other number, and only in 1517 * normal form (no leading zero/etc). 1518 */ 1519 if (namelc[0] == '\0') 1520 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid); 1521 else if ((strtoul(namelc, &p, 10) != jid || 1522 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1523 error = EINVAL; 1524 vfs_opterror(opts, 1525 "name cannot be numeric (unless it is the jid)"); 1526 goto done_deref_locked; 1527 } 1528 /* 1529 * Make sure the name isn't too long for the prison or its 1530 * children. 1531 */ 1532 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1533 onamelen = strlen(pr->pr_name + pnamelen); 1534 namelen = strlen(namelc); 1535 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) { 1536 error = ENAMETOOLONG; 1537 goto done_deref_locked; 1538 } 1539 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1540 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1541 sizeof(pr->pr_name)) { 1542 error = ENAMETOOLONG; 1543 goto done_deref_locked; 1544 } 1545 } 1546 } 1547 if (pr_allow & ~ppr->pr_allow) { 1548 error = EPERM; 1549 goto done_deref_locked; 1550 } 1551 1552 /* 1553 * Let modules check their parameters. This requires unlocking and 1554 * then re-locking the prison, but this is still a valid state as long 1555 * as allprison_lock remains xlocked. 1556 */ 1557 mtx_unlock(&pr->pr_mtx); 1558 error = osd_jail_call(pr, PR_METHOD_CHECK, opts); 1559 if (error != 0) { 1560 prison_deref(pr, created 1561 ? PD_LIST_XLOCKED 1562 : PD_DEREF | PD_LIST_XLOCKED); 1563 goto done_releroot; 1564 } 1565 mtx_lock(&pr->pr_mtx); 1566 1567 /* At this point, all valid parameters should have been noted. */ 1568 TAILQ_FOREACH(opt, opts, link) { 1569 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1570 error = EINVAL; 1571 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1572 goto done_deref_locked; 1573 } 1574 } 1575 1576 /* Set the parameters of the prison. */ 1577 #ifdef INET 1578 redo_ip4 = 0; 1579 if (pr_flags & PR_IP4_USER) { 1580 pr->pr_flags |= PR_IP4; 1581 free(pr->pr_ip4, M_PRISON); 1582 pr->pr_ip4s = ip4s; 1583 pr->pr_ip4 = ip4; 1584 ip4 = NULL; 1585 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1586 #ifdef VIMAGE 1587 if (tpr->pr_flags & PR_VNET) { 1588 descend = 0; 1589 continue; 1590 } 1591 #endif 1592 if (prison_restrict_ip4(tpr, NULL)) { 1593 redo_ip4 = 1; 1594 descend = 0; 1595 } 1596 } 1597 } 1598 #endif 1599 #ifdef INET6 1600 redo_ip6 = 0; 1601 if (pr_flags & PR_IP6_USER) { 1602 pr->pr_flags |= PR_IP6; 1603 free(pr->pr_ip6, M_PRISON); 1604 pr->pr_ip6s = ip6s; 1605 pr->pr_ip6 = ip6; 1606 ip6 = NULL; 1607 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1608 #ifdef VIMAGE 1609 if (tpr->pr_flags & PR_VNET) { 1610 descend = 0; 1611 continue; 1612 } 1613 #endif 1614 if (prison_restrict_ip6(tpr, NULL)) { 1615 redo_ip6 = 1; 1616 descend = 0; 1617 } 1618 } 1619 } 1620 #endif 1621 if (gotslevel) { 1622 pr->pr_securelevel = slevel; 1623 /* Set all child jails to be at least this level. */ 1624 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1625 if (tpr->pr_securelevel < slevel) 1626 tpr->pr_securelevel = slevel; 1627 } 1628 if (gotchildmax) { 1629 pr->pr_childmax = childmax; 1630 /* Set all child jails to under this limit. */ 1631 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1632 if (tpr->pr_childmax > childmax - level) 1633 tpr->pr_childmax = childmax > level 1634 ? childmax - level : 0; 1635 } 1636 if (gotenforce) { 1637 pr->pr_enforce_statfs = enforce; 1638 /* Pass this restriction on to the children. */ 1639 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1640 if (tpr->pr_enforce_statfs < enforce) 1641 tpr->pr_enforce_statfs = enforce; 1642 } 1643 if (gotrsnum) { 1644 pr->pr_devfs_rsnum = rsnum; 1645 /* Pass this restriction on to the children. */ 1646 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1647 tpr->pr_devfs_rsnum = rsnum; 1648 } 1649 if (namelc != NULL) { 1650 if (ppr == &prison0) 1651 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name)); 1652 else 1653 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1654 ppr->pr_name, namelc); 1655 /* Change this component of child names. */ 1656 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1657 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1658 strlen(tpr->pr_name + onamelen) + 1); 1659 bcopy(pr->pr_name, tpr->pr_name, namelen); 1660 } 1661 } 1662 if (path != NULL) { 1663 /* Try to keep a real-rooted full pathname. */ 1664 if (fullpath_disabled && path[0] == '/' && 1665 strcmp(mypr->pr_path, "/")) 1666 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1667 mypr->pr_path, path); 1668 else 1669 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1670 pr->pr_root = root; 1671 } 1672 if (PR_HOST & ch_flags & ~pr_flags) { 1673 if (pr->pr_flags & PR_HOST) { 1674 /* 1675 * Copy the parent's host info. As with pr_ip4 above, 1676 * the lack of a lock on the parent is not a problem; 1677 * it is always set with allprison_lock at least 1678 * shared, and is held exclusively here. 1679 */ 1680 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1681 sizeof(pr->pr_hostname)); 1682 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1683 sizeof(pr->pr_domainname)); 1684 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1685 sizeof(pr->pr_hostuuid)); 1686 pr->pr_hostid = pr->pr_parent->pr_hostid; 1687 } 1688 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1689 /* Set this prison, and any descendants without PR_HOST. */ 1690 if (host != NULL) 1691 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1692 if (domain != NULL) 1693 strlcpy(pr->pr_domainname, domain, 1694 sizeof(pr->pr_domainname)); 1695 if (uuid != NULL) 1696 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1697 if (gothid) 1698 pr->pr_hostid = hid; 1699 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1700 if (tpr->pr_flags & PR_HOST) 1701 descend = 0; 1702 else { 1703 if (host != NULL) 1704 strlcpy(tpr->pr_hostname, 1705 pr->pr_hostname, 1706 sizeof(tpr->pr_hostname)); 1707 if (domain != NULL) 1708 strlcpy(tpr->pr_domainname, 1709 pr->pr_domainname, 1710 sizeof(tpr->pr_domainname)); 1711 if (uuid != NULL) 1712 strlcpy(tpr->pr_hostuuid, 1713 pr->pr_hostuuid, 1714 sizeof(tpr->pr_hostuuid)); 1715 if (gothid) 1716 tpr->pr_hostid = hid; 1717 } 1718 } 1719 } 1720 if ((tallow = ch_allow & ~pr_allow)) { 1721 /* Clear allow bits in all children. */ 1722 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1723 tpr->pr_allow &= ~tallow; 1724 } 1725 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1726 /* 1727 * Persistent prisons get an extra reference, and prisons losing their 1728 * persist flag lose that reference. Only do this for existing prisons 1729 * for now, so new ones will remain unseen until after the module 1730 * handlers have completed. 1731 */ 1732 born = pr->pr_uref == 0; 1733 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1734 if (pr_flags & PR_PERSIST) { 1735 pr->pr_ref++; 1736 pr->pr_uref++; 1737 } else { 1738 pr->pr_ref--; 1739 pr->pr_uref--; 1740 } 1741 } 1742 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1743 mtx_unlock(&pr->pr_mtx); 1744 1745 #ifdef RACCT 1746 if (racct_enable && created) 1747 prison_racct_attach(pr); 1748 #endif 1749 1750 /* Locks may have prevented a complete restriction of child IP 1751 * addresses. If so, allocate some more memory and try again. 1752 */ 1753 #ifdef INET 1754 while (redo_ip4) { 1755 ip4s = pr->pr_ip4s; 1756 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1757 mtx_lock(&pr->pr_mtx); 1758 redo_ip4 = 0; 1759 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1760 #ifdef VIMAGE 1761 if (tpr->pr_flags & PR_VNET) { 1762 descend = 0; 1763 continue; 1764 } 1765 #endif 1766 if (prison_restrict_ip4(tpr, ip4)) { 1767 if (ip4 != NULL) 1768 ip4 = NULL; 1769 else 1770 redo_ip4 = 1; 1771 } 1772 } 1773 mtx_unlock(&pr->pr_mtx); 1774 } 1775 #endif 1776 #ifdef INET6 1777 while (redo_ip6) { 1778 ip6s = pr->pr_ip6s; 1779 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1780 mtx_lock(&pr->pr_mtx); 1781 redo_ip6 = 0; 1782 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1783 #ifdef VIMAGE 1784 if (tpr->pr_flags & PR_VNET) { 1785 descend = 0; 1786 continue; 1787 } 1788 #endif 1789 if (prison_restrict_ip6(tpr, ip6)) { 1790 if (ip6 != NULL) 1791 ip6 = NULL; 1792 else 1793 redo_ip6 = 1; 1794 } 1795 } 1796 mtx_unlock(&pr->pr_mtx); 1797 } 1798 #endif 1799 1800 /* Let the modules do their work. */ 1801 sx_downgrade(&allprison_lock); 1802 if (born) { 1803 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1804 if (error) { 1805 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1806 prison_deref(pr, created 1807 ? PD_LIST_SLOCKED 1808 : PD_DEREF | PD_LIST_SLOCKED); 1809 goto done_errmsg; 1810 } 1811 } 1812 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1813 if (error) { 1814 if (born) 1815 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 1816 prison_deref(pr, created 1817 ? PD_LIST_SLOCKED 1818 : PD_DEREF | PD_LIST_SLOCKED); 1819 goto done_errmsg; 1820 } 1821 1822 /* Attach this process to the prison if requested. */ 1823 if (flags & JAIL_ATTACH) { 1824 mtx_lock(&pr->pr_mtx); 1825 error = do_jail_attach(td, pr); 1826 if (error) { 1827 vfs_opterror(opts, "attach failed"); 1828 if (!created) 1829 prison_deref(pr, PD_DEREF); 1830 goto done_errmsg; 1831 } 1832 } 1833 1834 #ifdef RACCT 1835 if (racct_enable && !created) { 1836 if (!(flags & JAIL_ATTACH)) 1837 sx_sunlock(&allprison_lock); 1838 prison_racct_modify(pr); 1839 if (!(flags & JAIL_ATTACH)) 1840 sx_slock(&allprison_lock); 1841 } 1842 #endif 1843 1844 td->td_retval[0] = pr->pr_id; 1845 1846 /* 1847 * Now that it is all there, drop the temporary reference from existing 1848 * prisons. Or add a reference to newly created persistent prisons 1849 * (which was not done earlier so that the prison would not be publicly 1850 * visible). 1851 */ 1852 if (!created) { 1853 prison_deref(pr, (flags & JAIL_ATTACH) 1854 ? PD_DEREF 1855 : PD_DEREF | PD_LIST_SLOCKED); 1856 } else { 1857 if (pr_flags & PR_PERSIST) { 1858 mtx_lock(&pr->pr_mtx); 1859 pr->pr_ref++; 1860 pr->pr_uref++; 1861 mtx_unlock(&pr->pr_mtx); 1862 } 1863 if (!(flags & JAIL_ATTACH)) 1864 sx_sunlock(&allprison_lock); 1865 } 1866 1867 goto done_free; 1868 1869 done_deref_locked: 1870 prison_deref(pr, created 1871 ? PD_LOCKED | PD_LIST_XLOCKED 1872 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1873 goto done_releroot; 1874 done_unlock_list: 1875 sx_xunlock(&allprison_lock); 1876 done_releroot: 1877 if (root != NULL) 1878 vrele(root); 1879 done_errmsg: 1880 if (error) { 1881 if (vfs_getopt(opts, "errmsg", (void **)&errmsg, 1882 &errmsg_len) == 0 && errmsg_len > 0) { 1883 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1884 if (optuio->uio_segflg == UIO_SYSSPACE) 1885 bcopy(errmsg, 1886 optuio->uio_iov[errmsg_pos].iov_base, 1887 errmsg_len); 1888 else 1889 copyout(errmsg, 1890 optuio->uio_iov[errmsg_pos].iov_base, 1891 errmsg_len); 1892 } 1893 } 1894 done_free: 1895 #ifdef INET 1896 free(ip4, M_PRISON); 1897 #endif 1898 #ifdef INET6 1899 free(ip6, M_PRISON); 1900 #endif 1901 if (g_path != NULL) 1902 free(g_path, M_TEMP); 1903 vfs_freeopts(opts); 1904 return (error); 1905 } 1906 1907 1908 /* 1909 * struct jail_get_args { 1910 * struct iovec *iovp; 1911 * unsigned int iovcnt; 1912 * int flags; 1913 * }; 1914 */ 1915 int 1916 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1917 { 1918 struct uio *auio; 1919 int error; 1920 1921 /* Check that we have an even number of iovecs. */ 1922 if (uap->iovcnt & 1) 1923 return (EINVAL); 1924 1925 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1926 if (error) 1927 return (error); 1928 error = kern_jail_get(td, auio, uap->flags); 1929 if (error == 0) 1930 error = copyout(auio->uio_iov, uap->iovp, 1931 uap->iovcnt * sizeof (struct iovec)); 1932 free(auio, M_IOV); 1933 return (error); 1934 } 1935 1936 int 1937 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1938 { 1939 struct prison *pr, *mypr; 1940 struct vfsopt *opt; 1941 struct vfsoptlist *opts; 1942 char *errmsg, *name; 1943 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1944 1945 if (flags & ~JAIL_GET_MASK) 1946 return (EINVAL); 1947 1948 /* Get the parameter list. */ 1949 error = vfs_buildopts(optuio, &opts); 1950 if (error) 1951 return (error); 1952 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1953 mypr = td->td_ucred->cr_prison; 1954 1955 /* 1956 * Find the prison specified by one of: lastjid, jid, name. 1957 */ 1958 sx_slock(&allprison_lock); 1959 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1960 if (error == 0) { 1961 TAILQ_FOREACH(pr, &allprison, pr_list) { 1962 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1963 mtx_lock(&pr->pr_mtx); 1964 if (pr->pr_ref > 0 && 1965 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1966 break; 1967 mtx_unlock(&pr->pr_mtx); 1968 } 1969 } 1970 if (pr != NULL) 1971 goto found_prison; 1972 error = ENOENT; 1973 vfs_opterror(opts, "no jail after %d", jid); 1974 goto done_unlock_list; 1975 } else if (error != ENOENT) 1976 goto done_unlock_list; 1977 1978 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1979 if (error == 0) { 1980 if (jid != 0) { 1981 pr = prison_find_child(mypr, jid); 1982 if (pr != NULL) { 1983 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1984 mtx_unlock(&pr->pr_mtx); 1985 error = ENOENT; 1986 vfs_opterror(opts, "jail %d is dying", 1987 jid); 1988 goto done_unlock_list; 1989 } 1990 goto found_prison; 1991 } 1992 error = ENOENT; 1993 vfs_opterror(opts, "jail %d not found", jid); 1994 goto done_unlock_list; 1995 } 1996 } else if (error != ENOENT) 1997 goto done_unlock_list; 1998 1999 error = vfs_getopt(opts, "name", (void **)&name, &len); 2000 if (error == 0) { 2001 if (len == 0 || name[len - 1] != '\0') { 2002 error = EINVAL; 2003 goto done_unlock_list; 2004 } 2005 pr = prison_find_name(mypr, name); 2006 if (pr != NULL) { 2007 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2008 mtx_unlock(&pr->pr_mtx); 2009 error = ENOENT; 2010 vfs_opterror(opts, "jail \"%s\" is dying", 2011 name); 2012 goto done_unlock_list; 2013 } 2014 goto found_prison; 2015 } 2016 error = ENOENT; 2017 vfs_opterror(opts, "jail \"%s\" not found", name); 2018 goto done_unlock_list; 2019 } else if (error != ENOENT) 2020 goto done_unlock_list; 2021 2022 vfs_opterror(opts, "no jail specified"); 2023 error = ENOENT; 2024 goto done_unlock_list; 2025 2026 found_prison: 2027 /* Get the parameters of the prison. */ 2028 pr->pr_ref++; 2029 locked = PD_LOCKED; 2030 td->td_retval[0] = pr->pr_id; 2031 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2032 if (error != 0 && error != ENOENT) 2033 goto done_deref; 2034 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2035 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2036 if (error != 0 && error != ENOENT) 2037 goto done_deref; 2038 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2039 if (error != 0 && error != ENOENT) 2040 goto done_deref; 2041 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2042 sizeof(pr->pr_cpuset->cs_id)); 2043 if (error != 0 && error != ENOENT) 2044 goto done_deref; 2045 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2046 if (error != 0 && error != ENOENT) 2047 goto done_deref; 2048 #ifdef INET 2049 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2050 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2051 if (error != 0 && error != ENOENT) 2052 goto done_deref; 2053 #endif 2054 #ifdef INET6 2055 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2056 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2057 if (error != 0 && error != ENOENT) 2058 goto done_deref; 2059 #endif 2060 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2061 sizeof(pr->pr_securelevel)); 2062 if (error != 0 && error != ENOENT) 2063 goto done_deref; 2064 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2065 sizeof(pr->pr_childcount)); 2066 if (error != 0 && error != ENOENT) 2067 goto done_deref; 2068 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2069 sizeof(pr->pr_childmax)); 2070 if (error != 0 && error != ENOENT) 2071 goto done_deref; 2072 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2073 if (error != 0 && error != ENOENT) 2074 goto done_deref; 2075 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2076 if (error != 0 && error != ENOENT) 2077 goto done_deref; 2078 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2079 if (error != 0 && error != ENOENT) 2080 goto done_deref; 2081 #ifdef COMPAT_FREEBSD32 2082 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2083 uint32_t hid32 = pr->pr_hostid; 2084 2085 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2086 } else 2087 #endif 2088 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2089 sizeof(pr->pr_hostid)); 2090 if (error != 0 && error != ENOENT) 2091 goto done_deref; 2092 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2093 sizeof(pr->pr_enforce_statfs)); 2094 if (error != 0 && error != ENOENT) 2095 goto done_deref; 2096 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2097 sizeof(pr->pr_devfs_rsnum)); 2098 if (error != 0 && error != ENOENT) 2099 goto done_deref; 2100 for (fi = 0; fi < nitems(pr_flag_names); fi++) { 2101 if (pr_flag_names[fi] == NULL) 2102 continue; 2103 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 2104 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 2105 if (error != 0 && error != ENOENT) 2106 goto done_deref; 2107 i = !i; 2108 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 2109 if (error != 0 && error != ENOENT) 2110 goto done_deref; 2111 } 2112 for (fi = 0; fi < nitems(pr_flag_jailsys); fi++) { 2113 i = pr->pr_flags & 2114 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2115 i = pr_flag_jailsys[fi].disable && 2116 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2117 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2118 : JAIL_SYS_INHERIT; 2119 error = 2120 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2121 if (error != 0 && error != ENOENT) 2122 goto done_deref; 2123 } 2124 for (fi = 0; fi < nitems(pr_allow_names); fi++) { 2125 if (pr_allow_names[fi] == NULL) 2126 continue; 2127 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2128 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2129 if (error != 0 && error != ENOENT) 2130 goto done_deref; 2131 i = !i; 2132 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2133 if (error != 0 && error != ENOENT) 2134 goto done_deref; 2135 } 2136 i = (pr->pr_uref == 0); 2137 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2138 if (error != 0 && error != ENOENT) 2139 goto done_deref; 2140 i = !i; 2141 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2142 if (error != 0 && error != ENOENT) 2143 goto done_deref; 2144 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2145 sizeof(pr->pr_osreldate)); 2146 if (error != 0 && error != ENOENT) 2147 goto done_deref; 2148 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2149 if (error != 0 && error != ENOENT) 2150 goto done_deref; 2151 2152 /* Get the module parameters. */ 2153 mtx_unlock(&pr->pr_mtx); 2154 locked = 0; 2155 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2156 if (error) 2157 goto done_deref; 2158 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2159 2160 /* By now, all parameters should have been noted. */ 2161 TAILQ_FOREACH(opt, opts, link) { 2162 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2163 error = EINVAL; 2164 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2165 goto done_errmsg; 2166 } 2167 } 2168 2169 /* Write the fetched parameters back to userspace. */ 2170 error = 0; 2171 TAILQ_FOREACH(opt, opts, link) { 2172 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2173 pos = 2 * opt->pos + 1; 2174 optuio->uio_iov[pos].iov_len = opt->len; 2175 if (opt->value != NULL) { 2176 if (optuio->uio_segflg == UIO_SYSSPACE) { 2177 bcopy(opt->value, 2178 optuio->uio_iov[pos].iov_base, 2179 opt->len); 2180 } else { 2181 error = copyout(opt->value, 2182 optuio->uio_iov[pos].iov_base, 2183 opt->len); 2184 if (error) 2185 break; 2186 } 2187 } 2188 } 2189 } 2190 goto done_errmsg; 2191 2192 done_deref: 2193 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2194 goto done_errmsg; 2195 2196 done_unlock_list: 2197 sx_sunlock(&allprison_lock); 2198 done_errmsg: 2199 if (error && errmsg_pos >= 0) { 2200 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2201 errmsg_pos = 2 * errmsg_pos + 1; 2202 if (errmsg_len > 0) { 2203 if (optuio->uio_segflg == UIO_SYSSPACE) 2204 bcopy(errmsg, 2205 optuio->uio_iov[errmsg_pos].iov_base, 2206 errmsg_len); 2207 else 2208 copyout(errmsg, 2209 optuio->uio_iov[errmsg_pos].iov_base, 2210 errmsg_len); 2211 } 2212 } 2213 vfs_freeopts(opts); 2214 return (error); 2215 } 2216 2217 2218 /* 2219 * struct jail_remove_args { 2220 * int jid; 2221 * }; 2222 */ 2223 int 2224 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2225 { 2226 struct prison *pr, *cpr, *lpr, *tpr; 2227 int descend, error; 2228 2229 error = priv_check(td, PRIV_JAIL_REMOVE); 2230 if (error) 2231 return (error); 2232 2233 sx_xlock(&allprison_lock); 2234 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2235 if (pr == NULL) { 2236 sx_xunlock(&allprison_lock); 2237 return (EINVAL); 2238 } 2239 2240 /* Remove all descendants of this prison, then remove this prison. */ 2241 pr->pr_ref++; 2242 if (!LIST_EMPTY(&pr->pr_children)) { 2243 mtx_unlock(&pr->pr_mtx); 2244 lpr = NULL; 2245 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2246 mtx_lock(&cpr->pr_mtx); 2247 if (cpr->pr_ref > 0) { 2248 tpr = cpr; 2249 cpr->pr_ref++; 2250 } else { 2251 /* Already removed - do not do it again. */ 2252 tpr = NULL; 2253 } 2254 mtx_unlock(&cpr->pr_mtx); 2255 if (lpr != NULL) { 2256 mtx_lock(&lpr->pr_mtx); 2257 prison_remove_one(lpr); 2258 sx_xlock(&allprison_lock); 2259 } 2260 lpr = tpr; 2261 } 2262 if (lpr != NULL) { 2263 mtx_lock(&lpr->pr_mtx); 2264 prison_remove_one(lpr); 2265 sx_xlock(&allprison_lock); 2266 } 2267 mtx_lock(&pr->pr_mtx); 2268 } 2269 prison_remove_one(pr); 2270 return (0); 2271 } 2272 2273 static void 2274 prison_remove_one(struct prison *pr) 2275 { 2276 struct proc *p; 2277 int deuref; 2278 2279 /* If the prison was persistent, it is not anymore. */ 2280 deuref = 0; 2281 if (pr->pr_flags & PR_PERSIST) { 2282 pr->pr_ref--; 2283 deuref = PD_DEUREF; 2284 pr->pr_flags &= ~PR_PERSIST; 2285 } 2286 2287 /* 2288 * jail_remove added a reference. If that's the only one, remove 2289 * the prison now. 2290 */ 2291 KASSERT(pr->pr_ref > 0, 2292 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2293 if (pr->pr_ref == 1) { 2294 prison_deref(pr, 2295 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2296 return; 2297 } 2298 2299 mtx_unlock(&pr->pr_mtx); 2300 sx_xunlock(&allprison_lock); 2301 /* 2302 * Kill all processes unfortunate enough to be attached to this prison. 2303 */ 2304 sx_slock(&allproc_lock); 2305 LIST_FOREACH(p, &allproc, p_list) { 2306 PROC_LOCK(p); 2307 if (p->p_state != PRS_NEW && p->p_ucred && 2308 p->p_ucred->cr_prison == pr) 2309 kern_psignal(p, SIGKILL); 2310 PROC_UNLOCK(p); 2311 } 2312 sx_sunlock(&allproc_lock); 2313 /* Remove the temporary reference added by jail_remove. */ 2314 prison_deref(pr, deuref | PD_DEREF); 2315 } 2316 2317 2318 /* 2319 * struct jail_attach_args { 2320 * int jid; 2321 * }; 2322 */ 2323 int 2324 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2325 { 2326 struct prison *pr; 2327 int error; 2328 2329 error = priv_check(td, PRIV_JAIL_ATTACH); 2330 if (error) 2331 return (error); 2332 2333 /* 2334 * Start with exclusive hold on allprison_lock to ensure that a possible 2335 * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove. 2336 * But then immediately downgrade it since we don't need to stop 2337 * readers. 2338 */ 2339 sx_xlock(&allprison_lock); 2340 sx_downgrade(&allprison_lock); 2341 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2342 if (pr == NULL) { 2343 sx_sunlock(&allprison_lock); 2344 return (EINVAL); 2345 } 2346 2347 /* 2348 * Do not allow a process to attach to a prison that is not 2349 * considered to be "alive". 2350 */ 2351 if (pr->pr_uref == 0) { 2352 mtx_unlock(&pr->pr_mtx); 2353 sx_sunlock(&allprison_lock); 2354 return (EINVAL); 2355 } 2356 2357 return (do_jail_attach(td, pr)); 2358 } 2359 2360 static int 2361 do_jail_attach(struct thread *td, struct prison *pr) 2362 { 2363 struct proc *p; 2364 struct ucred *newcred, *oldcred; 2365 int error; 2366 2367 /* 2368 * XXX: Note that there is a slight race here if two threads 2369 * in the same privileged process attempt to attach to two 2370 * different jails at the same time. It is important for 2371 * user processes not to do this, or they might end up with 2372 * a process root from one prison, but attached to the jail 2373 * of another. 2374 */ 2375 pr->pr_ref++; 2376 pr->pr_uref++; 2377 mtx_unlock(&pr->pr_mtx); 2378 2379 /* Let modules do whatever they need to prepare for attaching. */ 2380 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2381 if (error) { 2382 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2383 return (error); 2384 } 2385 sx_sunlock(&allprison_lock); 2386 2387 /* 2388 * Reparent the newly attached process to this jail. 2389 */ 2390 p = td->td_proc; 2391 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2392 if (error) 2393 goto e_revert_osd; 2394 2395 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2396 if ((error = change_dir(pr->pr_root, td)) != 0) 2397 goto e_unlock; 2398 #ifdef MAC 2399 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2400 goto e_unlock; 2401 #endif 2402 VOP_UNLOCK(pr->pr_root, 0); 2403 if ((error = pwd_chroot(td, pr->pr_root))) 2404 goto e_revert_osd; 2405 2406 newcred = crget(); 2407 PROC_LOCK(p); 2408 oldcred = crcopysafe(p, newcred); 2409 newcred->cr_prison = pr; 2410 proc_set_cred(p, newcred); 2411 setsugid(p); 2412 PROC_UNLOCK(p); 2413 #ifdef RACCT 2414 racct_proc_ucred_changed(p, oldcred, newcred); 2415 #endif 2416 prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF); 2417 crfree(oldcred); 2418 return (0); 2419 2420 e_unlock: 2421 VOP_UNLOCK(pr->pr_root, 0); 2422 e_revert_osd: 2423 /* Tell modules this thread is still in its old jail after all. */ 2424 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td); 2425 prison_deref(pr, PD_DEREF | PD_DEUREF); 2426 return (error); 2427 } 2428 2429 2430 /* 2431 * Returns a locked prison instance, or NULL on failure. 2432 */ 2433 struct prison * 2434 prison_find(int prid) 2435 { 2436 struct prison *pr; 2437 2438 sx_assert(&allprison_lock, SX_LOCKED); 2439 TAILQ_FOREACH(pr, &allprison, pr_list) { 2440 if (pr->pr_id == prid) { 2441 mtx_lock(&pr->pr_mtx); 2442 if (pr->pr_ref > 0) 2443 return (pr); 2444 mtx_unlock(&pr->pr_mtx); 2445 } 2446 } 2447 return (NULL); 2448 } 2449 2450 /* 2451 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2452 */ 2453 struct prison * 2454 prison_find_child(struct prison *mypr, int prid) 2455 { 2456 struct prison *pr; 2457 int descend; 2458 2459 sx_assert(&allprison_lock, SX_LOCKED); 2460 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2461 if (pr->pr_id == prid) { 2462 mtx_lock(&pr->pr_mtx); 2463 if (pr->pr_ref > 0) 2464 return (pr); 2465 mtx_unlock(&pr->pr_mtx); 2466 } 2467 } 2468 return (NULL); 2469 } 2470 2471 /* 2472 * Look for the name relative to mypr. Returns a locked prison or NULL. 2473 */ 2474 struct prison * 2475 prison_find_name(struct prison *mypr, const char *name) 2476 { 2477 struct prison *pr, *deadpr; 2478 size_t mylen; 2479 int descend; 2480 2481 sx_assert(&allprison_lock, SX_LOCKED); 2482 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2483 again: 2484 deadpr = NULL; 2485 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2486 if (!strcmp(pr->pr_name + mylen, name)) { 2487 mtx_lock(&pr->pr_mtx); 2488 if (pr->pr_ref > 0) { 2489 if (pr->pr_uref > 0) 2490 return (pr); 2491 deadpr = pr; 2492 } 2493 mtx_unlock(&pr->pr_mtx); 2494 } 2495 } 2496 /* There was no valid prison - perhaps there was a dying one. */ 2497 if (deadpr != NULL) { 2498 mtx_lock(&deadpr->pr_mtx); 2499 if (deadpr->pr_ref == 0) { 2500 mtx_unlock(&deadpr->pr_mtx); 2501 goto again; 2502 } 2503 } 2504 return (deadpr); 2505 } 2506 2507 /* 2508 * See if a prison has the specific flag set. 2509 */ 2510 int 2511 prison_flag(struct ucred *cred, unsigned flag) 2512 { 2513 2514 /* This is an atomic read, so no locking is necessary. */ 2515 return (cred->cr_prison->pr_flags & flag); 2516 } 2517 2518 int 2519 prison_allow(struct ucred *cred, unsigned flag) 2520 { 2521 2522 /* This is an atomic read, so no locking is necessary. */ 2523 return (cred->cr_prison->pr_allow & flag); 2524 } 2525 2526 /* 2527 * Remove a prison reference. If that was the last reference, remove the 2528 * prison itself - but not in this context in case there are locks held. 2529 */ 2530 void 2531 prison_free_locked(struct prison *pr) 2532 { 2533 int ref; 2534 2535 mtx_assert(&pr->pr_mtx, MA_OWNED); 2536 ref = --pr->pr_ref; 2537 mtx_unlock(&pr->pr_mtx); 2538 if (ref == 0) 2539 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2540 } 2541 2542 void 2543 prison_free(struct prison *pr) 2544 { 2545 2546 mtx_lock(&pr->pr_mtx); 2547 prison_free_locked(pr); 2548 } 2549 2550 /* 2551 * Complete a call to either prison_free or prison_proc_free. 2552 */ 2553 static void 2554 prison_complete(void *context, int pending) 2555 { 2556 struct prison *pr = context; 2557 2558 sx_xlock(&allprison_lock); 2559 mtx_lock(&pr->pr_mtx); 2560 prison_deref(pr, pr->pr_uref 2561 ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED 2562 : PD_LOCKED | PD_LIST_XLOCKED); 2563 } 2564 2565 /* 2566 * Remove a prison reference (usually). This internal version assumes no 2567 * mutexes are held, except perhaps the prison itself. If there are no more 2568 * references, release and delist the prison. On completion, the prison lock 2569 * and the allprison lock are both unlocked. 2570 */ 2571 static void 2572 prison_deref(struct prison *pr, int flags) 2573 { 2574 struct prison *ppr, *tpr; 2575 int ref, lasturef; 2576 2577 if (!(flags & PD_LOCKED)) 2578 mtx_lock(&pr->pr_mtx); 2579 for (;;) { 2580 if (flags & PD_DEUREF) { 2581 KASSERT(pr->pr_uref > 0, 2582 ("prison_deref PD_DEUREF on a dead prison (jid=%d)", 2583 pr->pr_id)); 2584 pr->pr_uref--; 2585 lasturef = pr->pr_uref == 0; 2586 if (lasturef) 2587 pr->pr_ref++; 2588 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2589 } else 2590 lasturef = 0; 2591 if (flags & PD_DEREF) { 2592 KASSERT(pr->pr_ref > 0, 2593 ("prison_deref PD_DEREF on a dead prison (jid=%d)", 2594 pr->pr_id)); 2595 pr->pr_ref--; 2596 } 2597 ref = pr->pr_ref; 2598 mtx_unlock(&pr->pr_mtx); 2599 2600 /* 2601 * Tell the modules if the last user reference was removed 2602 * (even it sticks around in dying state). 2603 */ 2604 if (lasturef) { 2605 if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) { 2606 sx_xlock(&allprison_lock); 2607 flags |= PD_LIST_XLOCKED; 2608 } 2609 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL); 2610 mtx_lock(&pr->pr_mtx); 2611 ref = --pr->pr_ref; 2612 mtx_unlock(&pr->pr_mtx); 2613 } 2614 2615 /* If the prison still has references, nothing else to do. */ 2616 if (ref > 0) { 2617 if (flags & PD_LIST_SLOCKED) 2618 sx_sunlock(&allprison_lock); 2619 else if (flags & PD_LIST_XLOCKED) 2620 sx_xunlock(&allprison_lock); 2621 return; 2622 } 2623 2624 if (flags & PD_LIST_SLOCKED) { 2625 if (!sx_try_upgrade(&allprison_lock)) { 2626 sx_sunlock(&allprison_lock); 2627 sx_xlock(&allprison_lock); 2628 } 2629 } else if (!(flags & PD_LIST_XLOCKED)) 2630 sx_xlock(&allprison_lock); 2631 2632 TAILQ_REMOVE(&allprison, pr, pr_list); 2633 LIST_REMOVE(pr, pr_sibling); 2634 ppr = pr->pr_parent; 2635 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2636 tpr->pr_childcount--; 2637 sx_xunlock(&allprison_lock); 2638 2639 #ifdef VIMAGE 2640 if (pr->pr_vnet != ppr->pr_vnet) 2641 vnet_destroy(pr->pr_vnet); 2642 #endif 2643 if (pr->pr_root != NULL) 2644 vrele(pr->pr_root); 2645 mtx_destroy(&pr->pr_mtx); 2646 #ifdef INET 2647 free(pr->pr_ip4, M_PRISON); 2648 #endif 2649 #ifdef INET6 2650 free(pr->pr_ip6, M_PRISON); 2651 #endif 2652 if (pr->pr_cpuset != NULL) 2653 cpuset_rel(pr->pr_cpuset); 2654 osd_jail_exit(pr); 2655 #ifdef RACCT 2656 if (racct_enable) 2657 prison_racct_detach(pr); 2658 #endif 2659 free(pr, M_PRISON); 2660 2661 /* Removing a prison frees a reference on its parent. */ 2662 pr = ppr; 2663 mtx_lock(&pr->pr_mtx); 2664 flags = PD_DEREF | PD_DEUREF; 2665 } 2666 } 2667 2668 void 2669 prison_hold_locked(struct prison *pr) 2670 { 2671 2672 mtx_assert(&pr->pr_mtx, MA_OWNED); 2673 KASSERT(pr->pr_ref > 0, 2674 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2675 pr->pr_ref++; 2676 } 2677 2678 void 2679 prison_hold(struct prison *pr) 2680 { 2681 2682 mtx_lock(&pr->pr_mtx); 2683 prison_hold_locked(pr); 2684 mtx_unlock(&pr->pr_mtx); 2685 } 2686 2687 void 2688 prison_proc_hold(struct prison *pr) 2689 { 2690 2691 mtx_lock(&pr->pr_mtx); 2692 KASSERT(pr->pr_uref > 0, 2693 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2694 pr->pr_uref++; 2695 mtx_unlock(&pr->pr_mtx); 2696 } 2697 2698 void 2699 prison_proc_free(struct prison *pr) 2700 { 2701 2702 mtx_lock(&pr->pr_mtx); 2703 KASSERT(pr->pr_uref > 0, 2704 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2705 if (pr->pr_uref > 1) 2706 pr->pr_uref--; 2707 else { 2708 /* 2709 * Don't remove the last user reference in this context, which 2710 * is expected to be a process that is not only locked, but 2711 * also half dead. 2712 */ 2713 pr->pr_ref++; 2714 mtx_unlock(&pr->pr_mtx); 2715 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2716 return; 2717 } 2718 mtx_unlock(&pr->pr_mtx); 2719 } 2720 2721 /* 2722 * Check if a jail supports the given address family. 2723 * 2724 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 2725 * if not. 2726 */ 2727 int 2728 prison_check_af(struct ucred *cred, int af) 2729 { 2730 struct prison *pr; 2731 int error; 2732 2733 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2734 2735 pr = cred->cr_prison; 2736 #ifdef VIMAGE 2737 /* Prisons with their own network stack are not limited. */ 2738 if (prison_owns_vnet(cred)) 2739 return (0); 2740 #endif 2741 2742 error = 0; 2743 switch (af) 2744 { 2745 #ifdef INET 2746 case AF_INET: 2747 if (pr->pr_flags & PR_IP4) 2748 { 2749 mtx_lock(&pr->pr_mtx); 2750 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 2751 error = EAFNOSUPPORT; 2752 mtx_unlock(&pr->pr_mtx); 2753 } 2754 break; 2755 #endif 2756 #ifdef INET6 2757 case AF_INET6: 2758 if (pr->pr_flags & PR_IP6) 2759 { 2760 mtx_lock(&pr->pr_mtx); 2761 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 2762 error = EAFNOSUPPORT; 2763 mtx_unlock(&pr->pr_mtx); 2764 } 2765 break; 2766 #endif 2767 case AF_LOCAL: 2768 case AF_ROUTE: 2769 break; 2770 default: 2771 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 2772 error = EAFNOSUPPORT; 2773 } 2774 return (error); 2775 } 2776 2777 /* 2778 * Check if given address belongs to the jail referenced by cred (wrapper to 2779 * prison_check_ip[46]). 2780 * 2781 * Returns 0 if jail doesn't restrict the address family or if address belongs 2782 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 2783 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 2784 */ 2785 int 2786 prison_if(struct ucred *cred, struct sockaddr *sa) 2787 { 2788 #ifdef INET 2789 struct sockaddr_in *sai; 2790 #endif 2791 #ifdef INET6 2792 struct sockaddr_in6 *sai6; 2793 #endif 2794 int error; 2795 2796 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2797 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 2798 2799 #ifdef VIMAGE 2800 if (prison_owns_vnet(cred)) 2801 return (0); 2802 #endif 2803 2804 error = 0; 2805 switch (sa->sa_family) 2806 { 2807 #ifdef INET 2808 case AF_INET: 2809 sai = (struct sockaddr_in *)sa; 2810 error = prison_check_ip4(cred, &sai->sin_addr); 2811 break; 2812 #endif 2813 #ifdef INET6 2814 case AF_INET6: 2815 sai6 = (struct sockaddr_in6 *)sa; 2816 error = prison_check_ip6(cred, &sai6->sin6_addr); 2817 break; 2818 #endif 2819 default: 2820 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 2821 error = EAFNOSUPPORT; 2822 } 2823 return (error); 2824 } 2825 2826 /* 2827 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 2828 */ 2829 int 2830 prison_check(struct ucred *cred1, struct ucred *cred2) 2831 { 2832 2833 return ((cred1->cr_prison == cred2->cr_prison || 2834 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 2835 } 2836 2837 /* 2838 * Return 1 if p2 is a child of p1, otherwise 0. 2839 */ 2840 int 2841 prison_ischild(struct prison *pr1, struct prison *pr2) 2842 { 2843 2844 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 2845 if (pr1 == pr2) 2846 return (1); 2847 return (0); 2848 } 2849 2850 /* 2851 * Return 1 if the passed credential is in a jail, otherwise 0. 2852 */ 2853 int 2854 jailed(struct ucred *cred) 2855 { 2856 2857 return (cred->cr_prison != &prison0); 2858 } 2859 2860 /* 2861 * Return 1 if the passed credential is in a jail and that jail does not 2862 * have its own virtual network stack, otherwise 0. 2863 */ 2864 int 2865 jailed_without_vnet(struct ucred *cred) 2866 { 2867 2868 if (!jailed(cred)) 2869 return (0); 2870 #ifdef VIMAGE 2871 if (prison_owns_vnet(cred)) 2872 return (0); 2873 #endif 2874 2875 return (1); 2876 } 2877 2878 /* 2879 * Return the correct hostname (domainname, et al) for the passed credential. 2880 */ 2881 void 2882 getcredhostname(struct ucred *cred, char *buf, size_t size) 2883 { 2884 struct prison *pr; 2885 2886 /* 2887 * A NULL credential can be used to shortcut to the physical 2888 * system's hostname. 2889 */ 2890 pr = (cred != NULL) ? cred->cr_prison : &prison0; 2891 mtx_lock(&pr->pr_mtx); 2892 strlcpy(buf, pr->pr_hostname, size); 2893 mtx_unlock(&pr->pr_mtx); 2894 } 2895 2896 void 2897 getcreddomainname(struct ucred *cred, char *buf, size_t size) 2898 { 2899 2900 mtx_lock(&cred->cr_prison->pr_mtx); 2901 strlcpy(buf, cred->cr_prison->pr_domainname, size); 2902 mtx_unlock(&cred->cr_prison->pr_mtx); 2903 } 2904 2905 void 2906 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 2907 { 2908 2909 mtx_lock(&cred->cr_prison->pr_mtx); 2910 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 2911 mtx_unlock(&cred->cr_prison->pr_mtx); 2912 } 2913 2914 void 2915 getcredhostid(struct ucred *cred, unsigned long *hostid) 2916 { 2917 2918 mtx_lock(&cred->cr_prison->pr_mtx); 2919 *hostid = cred->cr_prison->pr_hostid; 2920 mtx_unlock(&cred->cr_prison->pr_mtx); 2921 } 2922 2923 #ifdef VIMAGE 2924 /* 2925 * Determine whether the prison represented by cred owns 2926 * its vnet rather than having it inherited. 2927 * 2928 * Returns 1 in case the prison owns the vnet, 0 otherwise. 2929 */ 2930 int 2931 prison_owns_vnet(struct ucred *cred) 2932 { 2933 2934 /* 2935 * vnets cannot be added/removed after jail creation, 2936 * so no need to lock here. 2937 */ 2938 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 2939 } 2940 #endif 2941 2942 /* 2943 * Determine whether the subject represented by cred can "see" 2944 * status of a mount point. 2945 * Returns: 0 for permitted, ENOENT otherwise. 2946 * XXX: This function should be called cr_canseemount() and should be 2947 * placed in kern_prot.c. 2948 */ 2949 int 2950 prison_canseemount(struct ucred *cred, struct mount *mp) 2951 { 2952 struct prison *pr; 2953 struct statfs *sp; 2954 size_t len; 2955 2956 pr = cred->cr_prison; 2957 if (pr->pr_enforce_statfs == 0) 2958 return (0); 2959 if (pr->pr_root->v_mount == mp) 2960 return (0); 2961 if (pr->pr_enforce_statfs == 2) 2962 return (ENOENT); 2963 /* 2964 * If jail's chroot directory is set to "/" we should be able to see 2965 * all mount-points from inside a jail. 2966 * This is ugly check, but this is the only situation when jail's 2967 * directory ends with '/'. 2968 */ 2969 if (strcmp(pr->pr_path, "/") == 0) 2970 return (0); 2971 len = strlen(pr->pr_path); 2972 sp = &mp->mnt_stat; 2973 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 2974 return (ENOENT); 2975 /* 2976 * Be sure that we don't have situation where jail's root directory 2977 * is "/some/path" and mount point is "/some/pathpath". 2978 */ 2979 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 2980 return (ENOENT); 2981 return (0); 2982 } 2983 2984 void 2985 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 2986 { 2987 char jpath[MAXPATHLEN]; 2988 struct prison *pr; 2989 size_t len; 2990 2991 pr = cred->cr_prison; 2992 if (pr->pr_enforce_statfs == 0) 2993 return; 2994 if (prison_canseemount(cred, mp) != 0) { 2995 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 2996 strlcpy(sp->f_mntonname, "[restricted]", 2997 sizeof(sp->f_mntonname)); 2998 return; 2999 } 3000 if (pr->pr_root->v_mount == mp) { 3001 /* 3002 * Clear current buffer data, so we are sure nothing from 3003 * the valid path left there. 3004 */ 3005 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3006 *sp->f_mntonname = '/'; 3007 return; 3008 } 3009 /* 3010 * If jail's chroot directory is set to "/" we should be able to see 3011 * all mount-points from inside a jail. 3012 */ 3013 if (strcmp(pr->pr_path, "/") == 0) 3014 return; 3015 len = strlen(pr->pr_path); 3016 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3017 /* 3018 * Clear current buffer data, so we are sure nothing from 3019 * the valid path left there. 3020 */ 3021 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3022 if (*jpath == '\0') { 3023 /* Should never happen. */ 3024 *sp->f_mntonname = '/'; 3025 } else { 3026 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3027 } 3028 } 3029 3030 /* 3031 * Check with permission for a specific privilege is granted within jail. We 3032 * have a specific list of accepted privileges; the rest are denied. 3033 */ 3034 int 3035 prison_priv_check(struct ucred *cred, int priv) 3036 { 3037 3038 if (!jailed(cred)) 3039 return (0); 3040 3041 #ifdef VIMAGE 3042 /* 3043 * Privileges specific to prisons with a virtual network stack. 3044 * There might be a duplicate entry here in case the privilege 3045 * is only granted conditionally in the legacy jail case. 3046 */ 3047 switch (priv) { 3048 #ifdef notyet 3049 /* 3050 * NFS-specific privileges. 3051 */ 3052 case PRIV_NFS_DAEMON: 3053 case PRIV_NFS_LOCKD: 3054 #endif 3055 /* 3056 * Network stack privileges. 3057 */ 3058 case PRIV_NET_BRIDGE: 3059 case PRIV_NET_GRE: 3060 case PRIV_NET_BPF: 3061 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3062 case PRIV_NET_ROUTE: 3063 case PRIV_NET_TAP: 3064 case PRIV_NET_SETIFMTU: 3065 case PRIV_NET_SETIFFLAGS: 3066 case PRIV_NET_SETIFCAP: 3067 case PRIV_NET_SETIFDESCR: 3068 case PRIV_NET_SETIFNAME : 3069 case PRIV_NET_SETIFMETRIC: 3070 case PRIV_NET_SETIFPHYS: 3071 case PRIV_NET_SETIFMAC: 3072 case PRIV_NET_ADDMULTI: 3073 case PRIV_NET_DELMULTI: 3074 case PRIV_NET_HWIOCTL: 3075 case PRIV_NET_SETLLADDR: 3076 case PRIV_NET_ADDIFGROUP: 3077 case PRIV_NET_DELIFGROUP: 3078 case PRIV_NET_IFCREATE: 3079 case PRIV_NET_IFDESTROY: 3080 case PRIV_NET_ADDIFADDR: 3081 case PRIV_NET_DELIFADDR: 3082 case PRIV_NET_LAGG: 3083 case PRIV_NET_GIF: 3084 case PRIV_NET_SETIFVNET: 3085 case PRIV_NET_SETIFFIB: 3086 3087 /* 3088 * 802.11-related privileges. 3089 */ 3090 case PRIV_NET80211_GETKEY: 3091 #ifdef notyet 3092 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3093 #endif 3094 3095 #ifdef notyet 3096 /* 3097 * ATM privileges. 3098 */ 3099 case PRIV_NETATM_CFG: 3100 case PRIV_NETATM_ADD: 3101 case PRIV_NETATM_DEL: 3102 case PRIV_NETATM_SET: 3103 3104 /* 3105 * Bluetooth privileges. 3106 */ 3107 case PRIV_NETBLUETOOTH_RAW: 3108 #endif 3109 3110 /* 3111 * Netgraph and netgraph module privileges. 3112 */ 3113 case PRIV_NETGRAPH_CONTROL: 3114 #ifdef notyet 3115 case PRIV_NETGRAPH_TTY: 3116 #endif 3117 3118 /* 3119 * IPv4 and IPv6 privileges. 3120 */ 3121 case PRIV_NETINET_IPFW: 3122 case PRIV_NETINET_DIVERT: 3123 case PRIV_NETINET_PF: 3124 case PRIV_NETINET_DUMMYNET: 3125 case PRIV_NETINET_CARP: 3126 case PRIV_NETINET_MROUTE: 3127 case PRIV_NETINET_RAW: 3128 case PRIV_NETINET_ADDRCTRL6: 3129 case PRIV_NETINET_ND6: 3130 case PRIV_NETINET_SCOPE6: 3131 case PRIV_NETINET_ALIFETIME6: 3132 case PRIV_NETINET_IPSEC: 3133 case PRIV_NETINET_BINDANY: 3134 3135 #ifdef notyet 3136 /* 3137 * NCP privileges. 3138 */ 3139 case PRIV_NETNCP: 3140 3141 /* 3142 * SMB privileges. 3143 */ 3144 case PRIV_NETSMB: 3145 #endif 3146 3147 /* 3148 * No default: or deny here. 3149 * In case of no permit fall through to next switch(). 3150 */ 3151 if (cred->cr_prison->pr_flags & PR_VNET) 3152 return (0); 3153 } 3154 #endif /* VIMAGE */ 3155 3156 switch (priv) { 3157 3158 /* 3159 * Allow ktrace privileges for root in jail. 3160 */ 3161 case PRIV_KTRACE: 3162 3163 #if 0 3164 /* 3165 * Allow jailed processes to configure audit identity and 3166 * submit audit records (login, etc). In the future we may 3167 * want to further refine the relationship between audit and 3168 * jail. 3169 */ 3170 case PRIV_AUDIT_GETAUDIT: 3171 case PRIV_AUDIT_SETAUDIT: 3172 case PRIV_AUDIT_SUBMIT: 3173 #endif 3174 3175 /* 3176 * Allow jailed processes to manipulate process UNIX 3177 * credentials in any way they see fit. 3178 */ 3179 case PRIV_CRED_SETUID: 3180 case PRIV_CRED_SETEUID: 3181 case PRIV_CRED_SETGID: 3182 case PRIV_CRED_SETEGID: 3183 case PRIV_CRED_SETGROUPS: 3184 case PRIV_CRED_SETREUID: 3185 case PRIV_CRED_SETREGID: 3186 case PRIV_CRED_SETRESUID: 3187 case PRIV_CRED_SETRESGID: 3188 3189 /* 3190 * Jail implements visibility constraints already, so allow 3191 * jailed root to override uid/gid-based constraints. 3192 */ 3193 case PRIV_SEEOTHERGIDS: 3194 case PRIV_SEEOTHERUIDS: 3195 3196 /* 3197 * Jail implements inter-process debugging limits already, so 3198 * allow jailed root various debugging privileges. 3199 */ 3200 case PRIV_DEBUG_DIFFCRED: 3201 case PRIV_DEBUG_SUGID: 3202 case PRIV_DEBUG_UNPRIV: 3203 3204 /* 3205 * Allow jail to set various resource limits and login 3206 * properties, and for now, exceed process resource limits. 3207 */ 3208 case PRIV_PROC_LIMIT: 3209 case PRIV_PROC_SETLOGIN: 3210 case PRIV_PROC_SETRLIMIT: 3211 3212 /* 3213 * System V and POSIX IPC privileges are granted in jail. 3214 */ 3215 case PRIV_IPC_READ: 3216 case PRIV_IPC_WRITE: 3217 case PRIV_IPC_ADMIN: 3218 case PRIV_IPC_MSGSIZE: 3219 case PRIV_MQ_ADMIN: 3220 3221 /* 3222 * Jail operations within a jail work on child jails. 3223 */ 3224 case PRIV_JAIL_ATTACH: 3225 case PRIV_JAIL_SET: 3226 case PRIV_JAIL_REMOVE: 3227 3228 /* 3229 * Jail implements its own inter-process limits, so allow 3230 * root processes in jail to change scheduling on other 3231 * processes in the same jail. Likewise for signalling. 3232 */ 3233 case PRIV_SCHED_DIFFCRED: 3234 case PRIV_SCHED_CPUSET: 3235 case PRIV_SIGNAL_DIFFCRED: 3236 case PRIV_SIGNAL_SUGID: 3237 3238 /* 3239 * Allow jailed processes to write to sysctls marked as jail 3240 * writable. 3241 */ 3242 case PRIV_SYSCTL_WRITEJAIL: 3243 3244 /* 3245 * Allow root in jail to manage a variety of quota 3246 * properties. These should likely be conditional on a 3247 * configuration option. 3248 */ 3249 case PRIV_VFS_GETQUOTA: 3250 case PRIV_VFS_SETQUOTA: 3251 3252 /* 3253 * Since Jail relies on chroot() to implement file system 3254 * protections, grant many VFS privileges to root in jail. 3255 * Be careful to exclude mount-related and NFS-related 3256 * privileges. 3257 */ 3258 case PRIV_VFS_READ: 3259 case PRIV_VFS_WRITE: 3260 case PRIV_VFS_ADMIN: 3261 case PRIV_VFS_EXEC: 3262 case PRIV_VFS_LOOKUP: 3263 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3264 case PRIV_VFS_CHFLAGS_DEV: 3265 case PRIV_VFS_CHOWN: 3266 case PRIV_VFS_CHROOT: 3267 case PRIV_VFS_RETAINSUGID: 3268 case PRIV_VFS_FCHROOT: 3269 case PRIV_VFS_LINK: 3270 case PRIV_VFS_SETGID: 3271 case PRIV_VFS_STAT: 3272 case PRIV_VFS_STICKYFILE: 3273 3274 /* 3275 * As in the non-jail case, non-root users are expected to be 3276 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3277 * exists in the jail and they have permission to access it). 3278 */ 3279 case PRIV_KMEM_READ: 3280 return (0); 3281 3282 /* 3283 * Depending on the global setting, allow privilege of 3284 * setting system flags. 3285 */ 3286 case PRIV_VFS_SYSFLAGS: 3287 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3288 return (0); 3289 else 3290 return (EPERM); 3291 3292 /* 3293 * Depending on the global setting, allow privilege of 3294 * mounting/unmounting file systems. 3295 */ 3296 case PRIV_VFS_MOUNT: 3297 case PRIV_VFS_UNMOUNT: 3298 case PRIV_VFS_MOUNT_NONUSER: 3299 case PRIV_VFS_MOUNT_OWNER: 3300 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3301 cred->cr_prison->pr_enforce_statfs < 2) 3302 return (0); 3303 else 3304 return (EPERM); 3305 3306 /* 3307 * Allow jailed root to bind reserved ports and reuse in-use 3308 * ports. 3309 */ 3310 case PRIV_NETINET_RESERVEDPORT: 3311 case PRIV_NETINET_REUSEPORT: 3312 return (0); 3313 3314 /* 3315 * Allow jailed root to set certain IPv4/6 (option) headers. 3316 */ 3317 case PRIV_NETINET_SETHDROPTS: 3318 return (0); 3319 3320 /* 3321 * Conditionally allow creating raw sockets in jail. 3322 */ 3323 case PRIV_NETINET_RAW: 3324 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3325 return (0); 3326 else 3327 return (EPERM); 3328 3329 /* 3330 * Since jail implements its own visibility limits on netstat 3331 * sysctls, allow getcred. This allows identd to work in 3332 * jail. 3333 */ 3334 case PRIV_NETINET_GETCRED: 3335 return (0); 3336 3337 /* 3338 * Allow jailed root to set loginclass. 3339 */ 3340 case PRIV_PROC_SETLOGINCLASS: 3341 return (0); 3342 3343 default: 3344 /* 3345 * In all remaining cases, deny the privilege request. This 3346 * includes almost all network privileges, many system 3347 * configuration privileges. 3348 */ 3349 return (EPERM); 3350 } 3351 } 3352 3353 /* 3354 * Return the part of pr2's name that is relative to pr1, or the whole name 3355 * if it does not directly follow. 3356 */ 3357 3358 char * 3359 prison_name(struct prison *pr1, struct prison *pr2) 3360 { 3361 char *name; 3362 3363 /* Jails see themselves as "" (if they see themselves at all). */ 3364 if (pr1 == pr2) 3365 return ""; 3366 name = pr2->pr_name; 3367 if (prison_ischild(pr1, pr2)) { 3368 /* 3369 * pr1 isn't locked (and allprison_lock may not be either) 3370 * so its length can't be counted on. But the number of dots 3371 * can be counted on - and counted. 3372 */ 3373 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3374 name = strchr(name, '.') + 1; 3375 } 3376 return (name); 3377 } 3378 3379 /* 3380 * Return the part of pr2's path that is relative to pr1, or the whole path 3381 * if it does not directly follow. 3382 */ 3383 static char * 3384 prison_path(struct prison *pr1, struct prison *pr2) 3385 { 3386 char *path1, *path2; 3387 int len1; 3388 3389 path1 = pr1->pr_path; 3390 path2 = pr2->pr_path; 3391 if (!strcmp(path1, "/")) 3392 return (path2); 3393 len1 = strlen(path1); 3394 if (strncmp(path1, path2, len1)) 3395 return (path2); 3396 if (path2[len1] == '\0') 3397 return "/"; 3398 if (path2[len1] == '/') 3399 return (path2 + len1); 3400 return (path2); 3401 } 3402 3403 3404 /* 3405 * Jail-related sysctls. 3406 */ 3407 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 3408 "Jails"); 3409 3410 static int 3411 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 3412 { 3413 struct xprison *xp; 3414 struct prison *pr, *cpr; 3415 #ifdef INET 3416 struct in_addr *ip4 = NULL; 3417 int ip4s = 0; 3418 #endif 3419 #ifdef INET6 3420 struct in6_addr *ip6 = NULL; 3421 int ip6s = 0; 3422 #endif 3423 int descend, error; 3424 3425 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 3426 pr = req->td->td_ucred->cr_prison; 3427 error = 0; 3428 sx_slock(&allprison_lock); 3429 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 3430 #if defined(INET) || defined(INET6) 3431 again: 3432 #endif 3433 mtx_lock(&cpr->pr_mtx); 3434 #ifdef INET 3435 if (cpr->pr_ip4s > 0) { 3436 if (ip4s < cpr->pr_ip4s) { 3437 ip4s = cpr->pr_ip4s; 3438 mtx_unlock(&cpr->pr_mtx); 3439 ip4 = realloc(ip4, ip4s * 3440 sizeof(struct in_addr), M_TEMP, M_WAITOK); 3441 goto again; 3442 } 3443 bcopy(cpr->pr_ip4, ip4, 3444 cpr->pr_ip4s * sizeof(struct in_addr)); 3445 } 3446 #endif 3447 #ifdef INET6 3448 if (cpr->pr_ip6s > 0) { 3449 if (ip6s < cpr->pr_ip6s) { 3450 ip6s = cpr->pr_ip6s; 3451 mtx_unlock(&cpr->pr_mtx); 3452 ip6 = realloc(ip6, ip6s * 3453 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 3454 goto again; 3455 } 3456 bcopy(cpr->pr_ip6, ip6, 3457 cpr->pr_ip6s * sizeof(struct in6_addr)); 3458 } 3459 #endif 3460 if (cpr->pr_ref == 0) { 3461 mtx_unlock(&cpr->pr_mtx); 3462 continue; 3463 } 3464 bzero(xp, sizeof(*xp)); 3465 xp->pr_version = XPRISON_VERSION; 3466 xp->pr_id = cpr->pr_id; 3467 xp->pr_state = cpr->pr_uref > 0 3468 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 3469 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 3470 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 3471 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 3472 #ifdef INET 3473 xp->pr_ip4s = cpr->pr_ip4s; 3474 #endif 3475 #ifdef INET6 3476 xp->pr_ip6s = cpr->pr_ip6s; 3477 #endif 3478 mtx_unlock(&cpr->pr_mtx); 3479 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 3480 if (error) 3481 break; 3482 #ifdef INET 3483 if (xp->pr_ip4s > 0) { 3484 error = SYSCTL_OUT(req, ip4, 3485 xp->pr_ip4s * sizeof(struct in_addr)); 3486 if (error) 3487 break; 3488 } 3489 #endif 3490 #ifdef INET6 3491 if (xp->pr_ip6s > 0) { 3492 error = SYSCTL_OUT(req, ip6, 3493 xp->pr_ip6s * sizeof(struct in6_addr)); 3494 if (error) 3495 break; 3496 } 3497 #endif 3498 } 3499 sx_sunlock(&allprison_lock); 3500 free(xp, M_TEMP); 3501 #ifdef INET 3502 free(ip4, M_TEMP); 3503 #endif 3504 #ifdef INET6 3505 free(ip6, M_TEMP); 3506 #endif 3507 return (error); 3508 } 3509 3510 SYSCTL_OID(_security_jail, OID_AUTO, list, 3511 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3512 sysctl_jail_list, "S", "List of active jails"); 3513 3514 static int 3515 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 3516 { 3517 int error, injail; 3518 3519 injail = jailed(req->td->td_ucred); 3520 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 3521 3522 return (error); 3523 } 3524 3525 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 3526 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3527 sysctl_jail_jailed, "I", "Process in jail?"); 3528 3529 static int 3530 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 3531 { 3532 int error, havevnet; 3533 #ifdef VIMAGE 3534 struct ucred *cred = req->td->td_ucred; 3535 3536 havevnet = jailed(cred) && prison_owns_vnet(cred); 3537 #else 3538 havevnet = 0; 3539 #endif 3540 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 3541 3542 return (error); 3543 } 3544 3545 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 3546 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3547 sysctl_jail_vnet, "I", "Jail owns VNET?"); 3548 3549 #if defined(INET) || defined(INET6) 3550 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 3551 &jail_max_af_ips, 0, 3552 "Number of IP addresses a jail may have at most per address family (deprecated)"); 3553 #endif 3554 3555 /* 3556 * Default parameters for jail(2) compatibility. For historical reasons, 3557 * the sysctl names have varying similarity to the parameter names. Prisons 3558 * just see their own parameters, and can't change them. 3559 */ 3560 static int 3561 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 3562 { 3563 struct prison *pr; 3564 int allow, error, i; 3565 3566 pr = req->td->td_ucred->cr_prison; 3567 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 3568 3569 /* Get the current flag value, and convert it to a boolean. */ 3570 i = (allow & arg2) ? 1 : 0; 3571 if (arg1 != NULL) 3572 i = !i; 3573 error = sysctl_handle_int(oidp, &i, 0, req); 3574 if (error || !req->newptr) 3575 return (error); 3576 i = i ? arg2 : 0; 3577 if (arg1 != NULL) 3578 i ^= arg2; 3579 /* 3580 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 3581 * for writing. 3582 */ 3583 mtx_lock(&prison0.pr_mtx); 3584 jail_default_allow = (jail_default_allow & ~arg2) | i; 3585 mtx_unlock(&prison0.pr_mtx); 3586 return (0); 3587 } 3588 3589 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 3590 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3591 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 3592 "Processes in jail can set their hostnames (deprecated)"); 3593 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 3594 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3595 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 3596 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)"); 3597 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 3598 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3599 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 3600 "Processes in jail can use System V IPC primitives (deprecated)"); 3601 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 3602 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3603 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 3604 "Prison root can create raw sockets (deprecated)"); 3605 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 3606 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3607 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 3608 "Processes in jail can alter system file flags (deprecated)"); 3609 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 3610 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3611 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 3612 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)"); 3613 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed, 3614 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3615 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I", 3616 "Processes in jail can mount the devfs file system (deprecated)"); 3617 SYSCTL_PROC(_security_jail, OID_AUTO, mount_fdescfs_allowed, 3618 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3619 NULL, PR_ALLOW_MOUNT_FDESCFS, sysctl_jail_default_allow, "I", 3620 "Processes in jail can mount the fdescfs file system (deprecated)"); 3621 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed, 3622 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3623 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I", 3624 "Processes in jail can mount the nullfs file system (deprecated)"); 3625 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed, 3626 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3627 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I", 3628 "Processes in jail can mount the procfs file system (deprecated)"); 3629 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linprocfs_allowed, 3630 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3631 NULL, PR_ALLOW_MOUNT_LINPROCFS, sysctl_jail_default_allow, "I", 3632 "Processes in jail can mount the linprocfs file system (deprecated)"); 3633 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linsysfs_allowed, 3634 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3635 NULL, PR_ALLOW_MOUNT_LINSYSFS, sysctl_jail_default_allow, "I", 3636 "Processes in jail can mount the linsysfs file system (deprecated)"); 3637 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed, 3638 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3639 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I", 3640 "Processes in jail can mount the tmpfs file system (deprecated)"); 3641 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed, 3642 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3643 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I", 3644 "Processes in jail can mount the zfs file system (deprecated)"); 3645 3646 static int 3647 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 3648 { 3649 struct prison *pr; 3650 int level, error; 3651 3652 pr = req->td->td_ucred->cr_prison; 3653 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 3654 error = sysctl_handle_int(oidp, &level, 0, req); 3655 if (error || !req->newptr) 3656 return (error); 3657 *(int *)arg1 = level; 3658 return (0); 3659 } 3660 3661 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 3662 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3663 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 3664 sysctl_jail_default_level, "I", 3665 "Processes in jail cannot see all mounted file systems (deprecated)"); 3666 3667 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 3668 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 3669 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 3670 sysctl_jail_default_level, "I", 3671 "Ruleset for the devfs filesystem in jail (deprecated)"); 3672 3673 /* 3674 * Nodes to describe jail parameters. Maximum length of string parameters 3675 * is returned in the string itself, and the other parameters exist merely 3676 * to make themselves and their types known. 3677 */ 3678 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 3679 "Jail parameters"); 3680 3681 int 3682 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 3683 { 3684 int i; 3685 long l; 3686 size_t s; 3687 char numbuf[12]; 3688 3689 switch (oidp->oid_kind & CTLTYPE) 3690 { 3691 case CTLTYPE_LONG: 3692 case CTLTYPE_ULONG: 3693 l = 0; 3694 #ifdef SCTL_MASK32 3695 if (!(req->flags & SCTL_MASK32)) 3696 #endif 3697 return (SYSCTL_OUT(req, &l, sizeof(l))); 3698 case CTLTYPE_INT: 3699 case CTLTYPE_UINT: 3700 i = 0; 3701 return (SYSCTL_OUT(req, &i, sizeof(i))); 3702 case CTLTYPE_STRING: 3703 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 3704 return 3705 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 3706 case CTLTYPE_STRUCT: 3707 s = (size_t)arg2; 3708 return (SYSCTL_OUT(req, &s, sizeof(s))); 3709 } 3710 return (0); 3711 } 3712 3713 /* 3714 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 3715 * jail creation time but cannot be changed in an existing jail. 3716 */ 3717 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 3718 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 3719 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 3720 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 3721 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 3722 "I", "Jail secure level"); 3723 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 3724 "Jail value for kern.osreldate and uname -K"); 3725 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 3726 "Jail value for kern.osrelease and uname -r"); 3727 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 3728 "I", "Jail cannot see all mounted file systems"); 3729 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 3730 "I", "Ruleset for in-jail devfs mounts"); 3731 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 3732 "B", "Jail persistence"); 3733 #ifdef VIMAGE 3734 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 3735 "E,jailsys", "Virtual network stack"); 3736 #endif 3737 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 3738 "B", "Jail is in the process of shutting down"); 3739 3740 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 3741 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 3742 "I", "Current number of child jails"); 3743 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 3744 "I", "Maximum number of child jails"); 3745 3746 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 3747 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 3748 "Jail hostname"); 3749 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 3750 "Jail NIS domainname"); 3751 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 3752 "Jail host UUID"); 3753 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 3754 "LU", "Jail host ID"); 3755 3756 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 3757 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 3758 3759 #ifdef INET 3760 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 3761 "Jail IPv4 address virtualization"); 3762 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 3763 "S,in_addr,a", "Jail IPv4 addresses"); 3764 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3765 "B", "Do (not) use IPv4 source address selection rather than the " 3766 "primary jail IPv4 address."); 3767 #endif 3768 #ifdef INET6 3769 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 3770 "Jail IPv6 address virtualization"); 3771 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 3772 "S,in6_addr,a", "Jail IPv6 addresses"); 3773 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 3774 "B", "Do (not) use IPv6 source address selection rather than the " 3775 "primary jail IPv6 address."); 3776 #endif 3777 3778 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 3779 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 3780 "B", "Jail may set hostname"); 3781 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 3782 "B", "Jail may use SYSV IPC"); 3783 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 3784 "B", "Jail may create raw sockets"); 3785 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 3786 "B", "Jail may alter system file flags"); 3787 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 3788 "B", "Jail may set file quotas"); 3789 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 3790 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 3791 3792 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 3793 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 3794 "B", "Jail may mount/unmount jail-friendly file systems in general"); 3795 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW, 3796 "B", "Jail may mount the devfs file system"); 3797 SYSCTL_JAIL_PARAM(_allow_mount, fdescfs, CTLTYPE_INT | CTLFLAG_RW, 3798 "B", "Jail may mount the fdescfs file system"); 3799 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW, 3800 "B", "Jail may mount the nullfs file system"); 3801 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW, 3802 "B", "Jail may mount the procfs file system"); 3803 SYSCTL_JAIL_PARAM(_allow_mount, linprocfs, CTLTYPE_INT | CTLFLAG_RW, 3804 "B", "Jail may mount the linprocfs file system"); 3805 SYSCTL_JAIL_PARAM(_allow_mount, linsysfs, CTLTYPE_INT | CTLFLAG_RW, 3806 "B", "Jail may mount the linsysfs file system"); 3807 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW, 3808 "B", "Jail may mount the tmpfs file system"); 3809 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW, 3810 "B", "Jail may mount the zfs file system"); 3811 3812 #ifdef RACCT 3813 void 3814 prison_racct_foreach(void (*callback)(struct racct *racct, 3815 void *arg2, void *arg3), void (*pre)(void), void (*post)(void), 3816 void *arg2, void *arg3) 3817 { 3818 struct prison_racct *prr; 3819 3820 ASSERT_RACCT_ENABLED(); 3821 3822 sx_slock(&allprison_lock); 3823 if (pre != NULL) 3824 (pre)(); 3825 LIST_FOREACH(prr, &allprison_racct, prr_next) 3826 (callback)(prr->prr_racct, arg2, arg3); 3827 if (post != NULL) 3828 (post)(); 3829 sx_sunlock(&allprison_lock); 3830 } 3831 3832 static struct prison_racct * 3833 prison_racct_find_locked(const char *name) 3834 { 3835 struct prison_racct *prr; 3836 3837 ASSERT_RACCT_ENABLED(); 3838 sx_assert(&allprison_lock, SA_XLOCKED); 3839 3840 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 3841 return (NULL); 3842 3843 LIST_FOREACH(prr, &allprison_racct, prr_next) { 3844 if (strcmp(name, prr->prr_name) != 0) 3845 continue; 3846 3847 /* Found prison_racct with a matching name? */ 3848 prison_racct_hold(prr); 3849 return (prr); 3850 } 3851 3852 /* Add new prison_racct. */ 3853 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 3854 racct_create(&prr->prr_racct); 3855 3856 strcpy(prr->prr_name, name); 3857 refcount_init(&prr->prr_refcount, 1); 3858 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 3859 3860 return (prr); 3861 } 3862 3863 struct prison_racct * 3864 prison_racct_find(const char *name) 3865 { 3866 struct prison_racct *prr; 3867 3868 ASSERT_RACCT_ENABLED(); 3869 3870 sx_xlock(&allprison_lock); 3871 prr = prison_racct_find_locked(name); 3872 sx_xunlock(&allprison_lock); 3873 return (prr); 3874 } 3875 3876 void 3877 prison_racct_hold(struct prison_racct *prr) 3878 { 3879 3880 ASSERT_RACCT_ENABLED(); 3881 3882 refcount_acquire(&prr->prr_refcount); 3883 } 3884 3885 static void 3886 prison_racct_free_locked(struct prison_racct *prr) 3887 { 3888 3889 ASSERT_RACCT_ENABLED(); 3890 sx_assert(&allprison_lock, SA_XLOCKED); 3891 3892 if (refcount_release(&prr->prr_refcount)) { 3893 racct_destroy(&prr->prr_racct); 3894 LIST_REMOVE(prr, prr_next); 3895 free(prr, M_PRISON_RACCT); 3896 } 3897 } 3898 3899 void 3900 prison_racct_free(struct prison_racct *prr) 3901 { 3902 int old; 3903 3904 ASSERT_RACCT_ENABLED(); 3905 sx_assert(&allprison_lock, SA_UNLOCKED); 3906 3907 old = prr->prr_refcount; 3908 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 3909 return; 3910 3911 sx_xlock(&allprison_lock); 3912 prison_racct_free_locked(prr); 3913 sx_xunlock(&allprison_lock); 3914 } 3915 3916 static void 3917 prison_racct_attach(struct prison *pr) 3918 { 3919 struct prison_racct *prr; 3920 3921 ASSERT_RACCT_ENABLED(); 3922 sx_assert(&allprison_lock, SA_XLOCKED); 3923 3924 prr = prison_racct_find_locked(pr->pr_name); 3925 KASSERT(prr != NULL, ("cannot find prison_racct")); 3926 3927 pr->pr_prison_racct = prr; 3928 } 3929 3930 /* 3931 * Handle jail renaming. From the racct point of view, renaming means 3932 * moving from one prison_racct to another. 3933 */ 3934 static void 3935 prison_racct_modify(struct prison *pr) 3936 { 3937 struct proc *p; 3938 struct ucred *cred; 3939 struct prison_racct *oldprr; 3940 3941 ASSERT_RACCT_ENABLED(); 3942 3943 sx_slock(&allproc_lock); 3944 sx_xlock(&allprison_lock); 3945 3946 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 3947 sx_xunlock(&allprison_lock); 3948 sx_sunlock(&allproc_lock); 3949 return; 3950 } 3951 3952 oldprr = pr->pr_prison_racct; 3953 pr->pr_prison_racct = NULL; 3954 3955 prison_racct_attach(pr); 3956 3957 /* 3958 * Move resource utilisation records. 3959 */ 3960 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 3961 3962 /* 3963 * Force rctl to reattach rules to processes. 3964 */ 3965 FOREACH_PROC_IN_SYSTEM(p) { 3966 PROC_LOCK(p); 3967 cred = crhold(p->p_ucred); 3968 PROC_UNLOCK(p); 3969 racct_proc_ucred_changed(p, cred, cred); 3970 crfree(cred); 3971 } 3972 3973 sx_sunlock(&allproc_lock); 3974 prison_racct_free_locked(oldprr); 3975 sx_xunlock(&allprison_lock); 3976 } 3977 3978 static void 3979 prison_racct_detach(struct prison *pr) 3980 { 3981 3982 ASSERT_RACCT_ENABLED(); 3983 sx_assert(&allprison_lock, SA_UNLOCKED); 3984 3985 if (pr->pr_prison_racct == NULL) 3986 return; 3987 prison_racct_free(pr->pr_prison_racct); 3988 pr->pr_prison_racct = NULL; 3989 } 3990 #endif /* RACCT */ 3991 3992 #ifdef DDB 3993 3994 static void 3995 db_show_prison(struct prison *pr) 3996 { 3997 int fi; 3998 #if defined(INET) || defined(INET6) 3999 int ii; 4000 #endif 4001 unsigned jsf; 4002 #ifdef INET 4003 char ip4buf[INET_ADDRSTRLEN]; 4004 #endif 4005 #ifdef INET6 4006 char ip6buf[INET6_ADDRSTRLEN]; 4007 #endif 4008 4009 db_printf("prison %p:\n", pr); 4010 db_printf(" jid = %d\n", pr->pr_id); 4011 db_printf(" name = %s\n", pr->pr_name); 4012 db_printf(" parent = %p\n", pr->pr_parent); 4013 db_printf(" ref = %d\n", pr->pr_ref); 4014 db_printf(" uref = %d\n", pr->pr_uref); 4015 db_printf(" path = %s\n", pr->pr_path); 4016 db_printf(" cpuset = %d\n", pr->pr_cpuset 4017 ? pr->pr_cpuset->cs_id : -1); 4018 #ifdef VIMAGE 4019 db_printf(" vnet = %p\n", pr->pr_vnet); 4020 #endif 4021 db_printf(" root = %p\n", pr->pr_root); 4022 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4023 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4024 db_printf(" children.max = %d\n", pr->pr_childmax); 4025 db_printf(" children.cur = %d\n", pr->pr_childcount); 4026 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4027 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4028 db_printf(" flags = 0x%x", pr->pr_flags); 4029 for (fi = 0; fi < nitems(pr_flag_names); fi++) 4030 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4031 db_printf(" %s", pr_flag_names[fi]); 4032 for (fi = 0; fi < nitems(pr_flag_jailsys); fi++) { 4033 jsf = pr->pr_flags & 4034 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4035 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4036 pr_flag_jailsys[fi].disable && 4037 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4038 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4039 : "inherit"); 4040 } 4041 db_printf(" allow = 0x%x", pr->pr_allow); 4042 for (fi = 0; fi < nitems(pr_allow_names); fi++) 4043 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4044 db_printf(" %s", pr_allow_names[fi]); 4045 db_printf("\n"); 4046 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4047 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4048 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4049 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4050 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4051 #ifdef INET 4052 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4053 for (ii = 0; ii < pr->pr_ip4s; ii++) 4054 db_printf(" %s %s\n", 4055 ii == 0 ? "ip4.addr =" : " ", 4056 inet_ntoa_r(pr->pr_ip4[ii], ip4buf)); 4057 #endif 4058 #ifdef INET6 4059 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4060 for (ii = 0; ii < pr->pr_ip6s; ii++) 4061 db_printf(" %s %s\n", 4062 ii == 0 ? "ip6.addr =" : " ", 4063 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4064 #endif 4065 } 4066 4067 DB_SHOW_COMMAND(prison, db_show_prison_command) 4068 { 4069 struct prison *pr; 4070 4071 if (!have_addr) { 4072 /* 4073 * Show all prisons in the list, and prison0 which is not 4074 * listed. 4075 */ 4076 db_show_prison(&prison0); 4077 if (!db_pager_quit) { 4078 TAILQ_FOREACH(pr, &allprison, pr_list) { 4079 db_show_prison(pr); 4080 if (db_pager_quit) 4081 break; 4082 } 4083 } 4084 return; 4085 } 4086 4087 if (addr == 0) 4088 pr = &prison0; 4089 else { 4090 /* Look for a prison with the ID and with references. */ 4091 TAILQ_FOREACH(pr, &allprison, pr_list) 4092 if (pr->pr_id == addr && pr->pr_ref > 0) 4093 break; 4094 if (pr == NULL) 4095 /* Look again, without requiring a reference. */ 4096 TAILQ_FOREACH(pr, &allprison, pr_list) 4097 if (pr->pr_id == addr) 4098 break; 4099 if (pr == NULL) 4100 /* Assume address points to a valid prison. */ 4101 pr = (struct prison *)addr; 4102 } 4103 db_show_prison(pr); 4104 } 4105 4106 #endif /* DDB */
Cache object: d292fea144d67432096afe25c7c74eef
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