Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_jail.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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/10.3/sys/kern/kern_jail.c 295951 2016-02-24 02:34:11Z araujo $"); 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 #ifdef INET6 72 #include <netinet6/in6_var.h> 73 #endif /* INET6 */ 74 #endif /* DDB */ 75 76 #include <security/mac/mac_framework.h> 77 78 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 79 80 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 81 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 82 83 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 84 #ifdef INET 85 #ifdef INET6 86 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 87 #else 88 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 89 #endif 90 #else /* !INET */ 91 #ifdef INET6 92 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 93 #else 94 #define _PR_IP_SADDRSEL 0 95 #endif 96 #endif 97 98 /* prison0 describes what is "real" about the system. */ 99 struct prison prison0 = { 100 .pr_id = 0, 101 .pr_name = "", 102 .pr_ref = 1, 103 .pr_uref = 1, 104 .pr_path = "/", 105 .pr_securelevel = -1, 106 .pr_devfs_rsnum = 0, 107 .pr_childmax = JAIL_MAX, 108 .pr_hostuuid = DEFAULT_HOSTUUID, 109 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 110 #ifdef VIMAGE 111 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 112 #else 113 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 114 #endif 115 .pr_allow = PR_ALLOW_ALL, 116 }; 117 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 118 119 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 120 struct sx allprison_lock; 121 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 122 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 123 LIST_HEAD(, prison_racct) allprison_racct; 124 int lastprid = 0; 125 126 static int do_jail_attach(struct thread *td, struct prison *pr); 127 static void prison_complete(void *context, int pending); 128 static void prison_deref(struct prison *pr, int flags); 129 static char *prison_path(struct prison *pr1, struct prison *pr2); 130 static void prison_remove_one(struct prison *pr); 131 #ifdef RACCT 132 static void prison_racct_attach(struct prison *pr); 133 static void prison_racct_modify(struct prison *pr); 134 static void prison_racct_detach(struct prison *pr); 135 #endif 136 #ifdef INET 137 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia); 138 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4); 139 #endif 140 #ifdef INET6 141 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6); 142 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6); 143 #endif 144 145 /* Flags for prison_deref */ 146 #define PD_DEREF 0x01 147 #define PD_DEUREF 0x02 148 #define PD_LOCKED 0x04 149 #define PD_LIST_SLOCKED 0x08 150 #define PD_LIST_XLOCKED 0x10 151 152 /* 153 * Parameter names corresponding to PR_* flag values. Size values are for kvm 154 * as we cannot figure out the size of a sparse array, or an array without a 155 * terminating entry. 156 */ 157 static char *pr_flag_names[] = { 158 [0] = "persist", 159 #ifdef INET 160 [7] = "ip4.saddrsel", 161 #endif 162 #ifdef INET6 163 [8] = "ip6.saddrsel", 164 #endif 165 }; 166 const size_t pr_flag_names_size = sizeof(pr_flag_names); 167 168 static char *pr_flag_nonames[] = { 169 [0] = "nopersist", 170 #ifdef INET 171 [7] = "ip4.nosaddrsel", 172 #endif 173 #ifdef INET6 174 [8] = "ip6.nosaddrsel", 175 #endif 176 }; 177 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames); 178 179 struct jailsys_flags { 180 const char *name; 181 unsigned disable; 182 unsigned new; 183 } pr_flag_jailsys[] = { 184 { "host", 0, PR_HOST }, 185 #ifdef VIMAGE 186 { "vnet", 0, PR_VNET }, 187 #endif 188 #ifdef INET 189 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER }, 190 #endif 191 #ifdef INET6 192 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER }, 193 #endif 194 }; 195 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 196 197 static char *pr_allow_names[] = { 198 "allow.set_hostname", 199 "allow.sysvipc", 200 "allow.raw_sockets", 201 "allow.chflags", 202 "allow.mount", 203 "allow.quotas", 204 "allow.socket_af", 205 "allow.mount.devfs", 206 "allow.mount.nullfs", 207 "allow.mount.zfs", 208 "allow.mount.procfs", 209 "allow.mount.tmpfs", 210 "allow.mount.fdescfs", 211 "allow.mount.linprocfs", 212 "allow.mount.linsysfs", 213 }; 214 const size_t pr_allow_names_size = sizeof(pr_allow_names); 215 216 static char *pr_allow_nonames[] = { 217 "allow.noset_hostname", 218 "allow.nosysvipc", 219 "allow.noraw_sockets", 220 "allow.nochflags", 221 "allow.nomount", 222 "allow.noquotas", 223 "allow.nosocket_af", 224 "allow.mount.nodevfs", 225 "allow.mount.nonullfs", 226 "allow.mount.nozfs", 227 "allow.mount.noprocfs", 228 "allow.mount.notmpfs", 229 "allow.mount.nofdescfs", 230 "allow.mount.nolinprocfs", 231 "allow.mount.nolinsysfs", 232 }; 233 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames); 234 235 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME 236 #define JAIL_DEFAULT_ENFORCE_STATFS 2 237 #define JAIL_DEFAULT_DEVFS_RSNUM 0 238 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 239 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 240 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 241 #if defined(INET) || defined(INET6) 242 static unsigned jail_max_af_ips = 255; 243 #endif 244 245 /* 246 * Initialize the parts of prison0 that can't be static-initialized with 247 * constants. This is called from proc0_init() after creating thread0 cpuset. 248 */ 249 void 250 prison0_init(void) 251 { 252 253 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset); 254 prison0.pr_osreldate = osreldate; 255 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease)); 256 } 257 258 #ifdef INET 259 static int 260 qcmp_v4(const void *ip1, const void *ip2) 261 { 262 in_addr_t iaa, iab; 263 264 /* 265 * We need to compare in HBO here to get the list sorted as expected 266 * by the result of the code. Sorting NBO addresses gives you 267 * interesting results. If you do not understand, do not try. 268 */ 269 iaa = ntohl(((const struct in_addr *)ip1)->s_addr); 270 iab = ntohl(((const struct in_addr *)ip2)->s_addr); 271 272 /* 273 * Do not simply return the difference of the two numbers, the int is 274 * not wide enough. 275 */ 276 if (iaa > iab) 277 return (1); 278 else if (iaa < iab) 279 return (-1); 280 else 281 return (0); 282 } 283 #endif 284 285 #ifdef INET6 286 static int 287 qcmp_v6(const void *ip1, const void *ip2) 288 { 289 const struct in6_addr *ia6a, *ia6b; 290 int i, rc; 291 292 ia6a = (const struct in6_addr *)ip1; 293 ia6b = (const struct in6_addr *)ip2; 294 295 rc = 0; 296 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { 297 if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) 298 rc = 1; 299 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) 300 rc = -1; 301 } 302 return (rc); 303 } 304 #endif 305 306 /* 307 * struct jail_args { 308 * struct jail *jail; 309 * }; 310 */ 311 int 312 sys_jail(struct thread *td, struct jail_args *uap) 313 { 314 uint32_t version; 315 int error; 316 struct jail j; 317 318 error = copyin(uap->jail, &version, sizeof(uint32_t)); 319 if (error) 320 return (error); 321 322 switch (version) { 323 case 0: 324 { 325 struct jail_v0 j0; 326 327 /* FreeBSD single IPv4 jails. */ 328 bzero(&j, sizeof(struct jail)); 329 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 330 if (error) 331 return (error); 332 j.version = j0.version; 333 j.path = j0.path; 334 j.hostname = j0.hostname; 335 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 336 break; 337 } 338 339 case 1: 340 /* 341 * Version 1 was used by multi-IPv4 jail implementations 342 * that never made it into the official kernel. 343 */ 344 return (EINVAL); 345 346 case 2: /* JAIL_API_VERSION */ 347 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 348 error = copyin(uap->jail, &j, sizeof(struct jail)); 349 if (error) 350 return (error); 351 break; 352 353 default: 354 /* Sci-Fi jails are not supported, sorry. */ 355 return (EINVAL); 356 } 357 return (kern_jail(td, &j)); 358 } 359 360 int 361 kern_jail(struct thread *td, struct jail *j) 362 { 363 struct iovec optiov[2 * (4 364 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0]) 365 #ifdef INET 366 + 1 367 #endif 368 #ifdef INET6 369 + 1 370 #endif 371 )]; 372 struct uio opt; 373 char *u_path, *u_hostname, *u_name; 374 #ifdef INET 375 uint32_t ip4s; 376 struct in_addr *u_ip4; 377 #endif 378 #ifdef INET6 379 struct in6_addr *u_ip6; 380 #endif 381 size_t tmplen; 382 int error, enforce_statfs, fi; 383 384 bzero(&optiov, sizeof(optiov)); 385 opt.uio_iov = optiov; 386 opt.uio_iovcnt = 0; 387 opt.uio_offset = -1; 388 opt.uio_resid = -1; 389 opt.uio_segflg = UIO_SYSSPACE; 390 opt.uio_rw = UIO_READ; 391 opt.uio_td = td; 392 393 /* Set permissions for top-level jails from sysctls. */ 394 if (!jailed(td->td_ucred)) { 395 for (fi = 0; fi < sizeof(pr_allow_names) / 396 sizeof(pr_allow_names[0]); fi++) { 397 optiov[opt.uio_iovcnt].iov_base = 398 (jail_default_allow & (1 << fi)) 399 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 400 optiov[opt.uio_iovcnt].iov_len = 401 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 402 opt.uio_iovcnt += 2; 403 } 404 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 405 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 406 opt.uio_iovcnt++; 407 enforce_statfs = jail_default_enforce_statfs; 408 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 409 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 410 opt.uio_iovcnt++; 411 } 412 413 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 414 #ifdef INET 415 ip4s = (j->version == 0) ? 1 : j->ip4s; 416 if (ip4s > jail_max_af_ips) 417 return (EINVAL); 418 tmplen += ip4s * sizeof(struct in_addr); 419 #else 420 if (j->ip4s > 0) 421 return (EINVAL); 422 #endif 423 #ifdef INET6 424 if (j->ip6s > jail_max_af_ips) 425 return (EINVAL); 426 tmplen += j->ip6s * sizeof(struct in6_addr); 427 #else 428 if (j->ip6s > 0) 429 return (EINVAL); 430 #endif 431 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 432 u_hostname = u_path + MAXPATHLEN; 433 u_name = u_hostname + MAXHOSTNAMELEN; 434 #ifdef INET 435 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 436 #endif 437 #ifdef INET6 438 #ifdef INET 439 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 440 #else 441 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 442 #endif 443 #endif 444 optiov[opt.uio_iovcnt].iov_base = "path"; 445 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 446 opt.uio_iovcnt++; 447 optiov[opt.uio_iovcnt].iov_base = u_path; 448 error = copyinstr(j->path, u_path, MAXPATHLEN, 449 &optiov[opt.uio_iovcnt].iov_len); 450 if (error) { 451 free(u_path, M_TEMP); 452 return (error); 453 } 454 opt.uio_iovcnt++; 455 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 456 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 457 opt.uio_iovcnt++; 458 optiov[opt.uio_iovcnt].iov_base = u_hostname; 459 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 460 &optiov[opt.uio_iovcnt].iov_len); 461 if (error) { 462 free(u_path, M_TEMP); 463 return (error); 464 } 465 opt.uio_iovcnt++; 466 if (j->jailname != NULL) { 467 optiov[opt.uio_iovcnt].iov_base = "name"; 468 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 469 opt.uio_iovcnt++; 470 optiov[opt.uio_iovcnt].iov_base = u_name; 471 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 472 &optiov[opt.uio_iovcnt].iov_len); 473 if (error) { 474 free(u_path, M_TEMP); 475 return (error); 476 } 477 opt.uio_iovcnt++; 478 } 479 #ifdef INET 480 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 481 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 482 opt.uio_iovcnt++; 483 optiov[opt.uio_iovcnt].iov_base = u_ip4; 484 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 485 if (j->version == 0) 486 u_ip4->s_addr = j->ip4s; 487 else { 488 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 489 if (error) { 490 free(u_path, M_TEMP); 491 return (error); 492 } 493 } 494 opt.uio_iovcnt++; 495 #endif 496 #ifdef INET6 497 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 498 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 499 opt.uio_iovcnt++; 500 optiov[opt.uio_iovcnt].iov_base = u_ip6; 501 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 502 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 503 if (error) { 504 free(u_path, M_TEMP); 505 return (error); 506 } 507 opt.uio_iovcnt++; 508 #endif 509 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]), 510 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 511 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 512 free(u_path, M_TEMP); 513 return (error); 514 } 515 516 517 /* 518 * struct jail_set_args { 519 * struct iovec *iovp; 520 * unsigned int iovcnt; 521 * int flags; 522 * }; 523 */ 524 int 525 sys_jail_set(struct thread *td, struct jail_set_args *uap) 526 { 527 struct uio *auio; 528 int error; 529 530 /* Check that we have an even number of iovecs. */ 531 if (uap->iovcnt & 1) 532 return (EINVAL); 533 534 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 535 if (error) 536 return (error); 537 error = kern_jail_set(td, auio, uap->flags); 538 free(auio, M_IOV); 539 return (error); 540 } 541 542 int 543 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 544 { 545 struct nameidata nd; 546 #ifdef INET 547 struct in_addr *ip4; 548 #endif 549 #ifdef INET6 550 struct in6_addr *ip6; 551 #endif 552 struct vfsopt *opt; 553 struct vfsoptlist *opts; 554 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 555 struct vnode *root; 556 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 557 char *g_path, *osrelstr; 558 #if defined(INET) || defined(INET6) 559 struct prison *tppr; 560 void *op; 561 #endif 562 unsigned long hid; 563 size_t namelen, onamelen; 564 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos; 565 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 566 int fi, jid, jsys, len, level; 567 int childmax, osreldt, rsnum, slevel; 568 int fullpath_disabled; 569 #if defined(INET) || defined(INET6) 570 int ii, ij; 571 #endif 572 #ifdef INET 573 int ip4s, redo_ip4; 574 #endif 575 #ifdef INET6 576 int ip6s, redo_ip6; 577 #endif 578 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 579 unsigned tallow; 580 char numbuf[12]; 581 582 error = priv_check(td, PRIV_JAIL_SET); 583 if (!error && (flags & JAIL_ATTACH)) 584 error = priv_check(td, PRIV_JAIL_ATTACH); 585 if (error) 586 return (error); 587 mypr = ppr = td->td_ucred->cr_prison; 588 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 589 return (EPERM); 590 if (flags & ~JAIL_SET_MASK) 591 return (EINVAL); 592 593 /* 594 * Check all the parameters before committing to anything. Not all 595 * errors can be caught early, but we may as well try. Also, this 596 * takes care of some expensive stuff (path lookup) before getting 597 * the allprison lock. 598 * 599 * XXX Jails are not filesystems, and jail parameters are not mount 600 * options. But it makes more sense to re-use the vfsopt code 601 * than duplicate it under a different name. 602 */ 603 error = vfs_buildopts(optuio, &opts); 604 if (error) 605 return (error); 606 #ifdef INET 607 ip4 = NULL; 608 #endif 609 #ifdef INET6 610 ip6 = NULL; 611 #endif 612 g_path = NULL; 613 614 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 615 if (error == ENOENT) 616 jid = 0; 617 else if (error != 0) 618 goto done_free; 619 620 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 621 if (error == ENOENT) 622 gotslevel = 0; 623 else if (error != 0) 624 goto done_free; 625 else 626 gotslevel = 1; 627 628 error = 629 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 630 if (error == ENOENT) 631 gotchildmax = 0; 632 else if (error != 0) 633 goto done_free; 634 else 635 gotchildmax = 1; 636 637 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 638 if (error == ENOENT) 639 gotenforce = 0; 640 else if (error != 0) 641 goto done_free; 642 else if (enforce < 0 || enforce > 2) { 643 error = EINVAL; 644 goto done_free; 645 } else 646 gotenforce = 1; 647 648 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 649 if (error == ENOENT) 650 gotrsnum = 0; 651 else if (error != 0) 652 goto done_free; 653 else 654 gotrsnum = 1; 655 656 pr_flags = ch_flags = 0; 657 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 658 fi++) { 659 if (pr_flag_names[fi] == NULL) 660 continue; 661 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 662 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 663 } 664 ch_flags |= pr_flags; 665 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 666 fi++) { 667 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys, 668 sizeof(jsys)); 669 if (error == ENOENT) 670 continue; 671 if (error != 0) 672 goto done_free; 673 switch (jsys) { 674 case JAIL_SYS_DISABLE: 675 if (!pr_flag_jailsys[fi].disable) { 676 error = EINVAL; 677 goto done_free; 678 } 679 pr_flags |= pr_flag_jailsys[fi].disable; 680 break; 681 case JAIL_SYS_NEW: 682 pr_flags |= pr_flag_jailsys[fi].new; 683 break; 684 case JAIL_SYS_INHERIT: 685 break; 686 default: 687 error = EINVAL; 688 goto done_free; 689 } 690 ch_flags |= 691 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable; 692 } 693 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 694 && !(pr_flags & PR_PERSIST)) { 695 error = EINVAL; 696 vfs_opterror(opts, "new jail must persist or attach"); 697 goto done_errmsg; 698 } 699 #ifdef VIMAGE 700 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 701 error = EINVAL; 702 vfs_opterror(opts, "vnet cannot be changed after creation"); 703 goto done_errmsg; 704 } 705 #endif 706 #ifdef INET 707 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 708 error = EINVAL; 709 vfs_opterror(opts, "ip4 cannot be changed after creation"); 710 goto done_errmsg; 711 } 712 #endif 713 #ifdef INET6 714 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 715 error = EINVAL; 716 vfs_opterror(opts, "ip6 cannot be changed after creation"); 717 goto done_errmsg; 718 } 719 #endif 720 721 pr_allow = ch_allow = 0; 722 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 723 fi++) { 724 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 725 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 726 } 727 ch_allow |= pr_allow; 728 729 error = vfs_getopt(opts, "name", (void **)&name, &len); 730 if (error == ENOENT) 731 name = NULL; 732 else if (error != 0) 733 goto done_free; 734 else { 735 if (len == 0 || name[len - 1] != '\0') { 736 error = EINVAL; 737 goto done_free; 738 } 739 if (len > MAXHOSTNAMELEN) { 740 error = ENAMETOOLONG; 741 goto done_free; 742 } 743 } 744 745 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 746 if (error == ENOENT) 747 host = NULL; 748 else if (error != 0) 749 goto done_free; 750 else { 751 ch_flags |= PR_HOST; 752 pr_flags |= PR_HOST; 753 if (len == 0 || host[len - 1] != '\0') { 754 error = EINVAL; 755 goto done_free; 756 } 757 if (len > MAXHOSTNAMELEN) { 758 error = ENAMETOOLONG; 759 goto done_free; 760 } 761 } 762 763 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 764 if (error == ENOENT) 765 domain = NULL; 766 else if (error != 0) 767 goto done_free; 768 else { 769 ch_flags |= PR_HOST; 770 pr_flags |= PR_HOST; 771 if (len == 0 || domain[len - 1] != '\0') { 772 error = EINVAL; 773 goto done_free; 774 } 775 if (len > MAXHOSTNAMELEN) { 776 error = ENAMETOOLONG; 777 goto done_free; 778 } 779 } 780 781 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 782 if (error == ENOENT) 783 uuid = NULL; 784 else if (error != 0) 785 goto done_free; 786 else { 787 ch_flags |= PR_HOST; 788 pr_flags |= PR_HOST; 789 if (len == 0 || uuid[len - 1] != '\0') { 790 error = EINVAL; 791 goto done_free; 792 } 793 if (len > HOSTUUIDLEN) { 794 error = ENAMETOOLONG; 795 goto done_free; 796 } 797 } 798 799 #ifdef COMPAT_FREEBSD32 800 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 801 uint32_t hid32; 802 803 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 804 hid = hid32; 805 } else 806 #endif 807 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 808 if (error == ENOENT) 809 gothid = 0; 810 else if (error != 0) 811 goto done_free; 812 else { 813 gothid = 1; 814 ch_flags |= PR_HOST; 815 pr_flags |= PR_HOST; 816 } 817 818 #ifdef INET 819 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 820 if (error == ENOENT) 821 ip4s = 0; 822 else if (error != 0) 823 goto done_free; 824 else if (ip4s & (sizeof(*ip4) - 1)) { 825 error = EINVAL; 826 goto done_free; 827 } else { 828 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE; 829 if (ip4s == 0) 830 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE; 831 else { 832 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER; 833 ip4s /= sizeof(*ip4); 834 if (ip4s > jail_max_af_ips) { 835 error = EINVAL; 836 vfs_opterror(opts, "too many IPv4 addresses"); 837 goto done_errmsg; 838 } 839 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 840 bcopy(op, ip4, ip4s * sizeof(*ip4)); 841 /* 842 * IP addresses are all sorted but ip[0] to preserve 843 * the primary IP address as given from userland. 844 * This special IP is used for unbound outgoing 845 * connections as well for "loopback" traffic in case 846 * source address selection cannot find any more fitting 847 * address to connect from. 848 */ 849 if (ip4s > 1) 850 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4); 851 /* 852 * Check for duplicate addresses and do some simple 853 * zero and broadcast checks. If users give other bogus 854 * addresses it is their problem. 855 * 856 * We do not have to care about byte order for these 857 * checks so we will do them in NBO. 858 */ 859 for (ii = 0; ii < ip4s; ii++) { 860 if (ip4[ii].s_addr == INADDR_ANY || 861 ip4[ii].s_addr == INADDR_BROADCAST) { 862 error = EINVAL; 863 goto done_free; 864 } 865 if ((ii+1) < ip4s && 866 (ip4[0].s_addr == ip4[ii+1].s_addr || 867 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 868 error = EINVAL; 869 goto done_free; 870 } 871 } 872 } 873 } 874 #endif 875 876 #ifdef INET6 877 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 878 if (error == ENOENT) 879 ip6s = 0; 880 else if (error != 0) 881 goto done_free; 882 else if (ip6s & (sizeof(*ip6) - 1)) { 883 error = EINVAL; 884 goto done_free; 885 } else { 886 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE; 887 if (ip6s == 0) 888 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE; 889 else { 890 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER; 891 ip6s /= sizeof(*ip6); 892 if (ip6s > jail_max_af_ips) { 893 error = EINVAL; 894 vfs_opterror(opts, "too many IPv6 addresses"); 895 goto done_errmsg; 896 } 897 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 898 bcopy(op, ip6, ip6s * sizeof(*ip6)); 899 if (ip6s > 1) 900 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6); 901 for (ii = 0; ii < ip6s; ii++) { 902 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 903 error = EINVAL; 904 goto done_free; 905 } 906 if ((ii+1) < ip6s && 907 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 908 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 909 { 910 error = EINVAL; 911 goto done_free; 912 } 913 } 914 } 915 } 916 #endif 917 918 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 919 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 920 error = EINVAL; 921 vfs_opterror(opts, 922 "vnet jails cannot have IP address restrictions"); 923 goto done_errmsg; 924 } 925 #endif 926 927 fullpath_disabled = 0; 928 root = NULL; 929 error = vfs_getopt(opts, "path", (void **)&path, &len); 930 if (error == ENOENT) 931 path = NULL; 932 else if (error != 0) 933 goto done_free; 934 else { 935 if (flags & JAIL_UPDATE) { 936 error = EINVAL; 937 vfs_opterror(opts, 938 "path cannot be changed after creation"); 939 goto done_errmsg; 940 } 941 if (len == 0 || path[len - 1] != '\0') { 942 error = EINVAL; 943 goto done_free; 944 } 945 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 946 path, td); 947 error = namei(&nd); 948 if (error) 949 goto done_free; 950 root = nd.ni_vp; 951 NDFREE(&nd, NDF_ONLY_PNBUF); 952 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 953 strlcpy(g_path, path, MAXPATHLEN); 954 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 955 if (error == 0) 956 path = g_path; 957 else if (error == ENODEV) { 958 /* proceed if sysctl debug.disablefullpath == 1 */ 959 fullpath_disabled = 1; 960 if (len < 2 || (len == 2 && path[0] == '/')) 961 path = NULL; 962 } else { 963 /* exit on other errors */ 964 goto done_free; 965 } 966 if (root->v_type != VDIR) { 967 error = ENOTDIR; 968 vput(root); 969 goto done_free; 970 } 971 VOP_UNLOCK(root, 0); 972 if (fullpath_disabled) { 973 /* Leave room for a real-root full pathname. */ 974 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 975 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 976 error = ENAMETOOLONG; 977 goto done_free; 978 } 979 } 980 } 981 982 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len); 983 if (error == ENOENT) 984 osrelstr = NULL; 985 else if (error != 0) 986 goto done_free; 987 else { 988 if (flags & JAIL_UPDATE) { 989 error = EINVAL; 990 vfs_opterror(opts, 991 "osrelease cannot be changed after creation"); 992 goto done_errmsg; 993 } 994 if (len == 0 || len >= OSRELEASELEN) { 995 error = EINVAL; 996 vfs_opterror(opts, 997 "osrelease string must be 1-%d bytes long", 998 OSRELEASELEN - 1); 999 goto done_errmsg; 1000 } 1001 } 1002 1003 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt)); 1004 if (error == ENOENT) 1005 osreldt = 0; 1006 else if (error != 0) 1007 goto done_free; 1008 else { 1009 if (flags & JAIL_UPDATE) { 1010 error = EINVAL; 1011 vfs_opterror(opts, 1012 "osreldate cannot be changed after creation"); 1013 goto done_errmsg; 1014 } 1015 if (osreldt == 0) { 1016 error = EINVAL; 1017 vfs_opterror(opts, "osreldate cannot be 0"); 1018 goto done_errmsg; 1019 } 1020 } 1021 1022 /* 1023 * Grab the allprison lock before letting modules check their 1024 * parameters. Once we have it, do not let go so we'll have a 1025 * consistent view of the OSD list. 1026 */ 1027 sx_xlock(&allprison_lock); 1028 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts); 1029 if (error) 1030 goto done_unlock_list; 1031 1032 /* By now, all parameters should have been noted. */ 1033 TAILQ_FOREACH(opt, opts, link) { 1034 if (!opt->seen && strcmp(opt->name, "errmsg")) { 1035 error = EINVAL; 1036 vfs_opterror(opts, "unknown parameter: %s", opt->name); 1037 goto done_unlock_list; 1038 } 1039 } 1040 1041 /* 1042 * See if we are creating a new record or updating an existing one. 1043 * This abuses the file error codes ENOENT and EEXIST. 1044 */ 1045 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 1046 if (!cuflags) { 1047 error = EINVAL; 1048 vfs_opterror(opts, "no valid operation (create or update)"); 1049 goto done_unlock_list; 1050 } 1051 pr = NULL; 1052 namelc = NULL; 1053 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 1054 namelc = strrchr(name, '.'); 1055 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 1056 if (*p != '\0') 1057 jid = 0; 1058 } 1059 if (jid != 0) { 1060 /* 1061 * See if a requested jid already exists. There is an 1062 * information leak here if the jid exists but is not within 1063 * the caller's jail hierarchy. Jail creators will get EEXIST 1064 * even though they cannot see the jail, and CREATE | UPDATE 1065 * will return ENOENT which is not normally a valid error. 1066 */ 1067 if (jid < 0) { 1068 error = EINVAL; 1069 vfs_opterror(opts, "negative jid"); 1070 goto done_unlock_list; 1071 } 1072 pr = prison_find(jid); 1073 if (pr != NULL) { 1074 ppr = pr->pr_parent; 1075 /* Create: jid must not exist. */ 1076 if (cuflags == JAIL_CREATE) { 1077 mtx_unlock(&pr->pr_mtx); 1078 error = EEXIST; 1079 vfs_opterror(opts, "jail %d already exists", 1080 jid); 1081 goto done_unlock_list; 1082 } 1083 if (!prison_ischild(mypr, pr)) { 1084 mtx_unlock(&pr->pr_mtx); 1085 pr = NULL; 1086 } else if (pr->pr_uref == 0) { 1087 if (!(flags & JAIL_DYING)) { 1088 mtx_unlock(&pr->pr_mtx); 1089 error = ENOENT; 1090 vfs_opterror(opts, "jail %d is dying", 1091 jid); 1092 goto done_unlock_list; 1093 } else if ((flags & JAIL_ATTACH) || 1094 (pr_flags & PR_PERSIST)) { 1095 /* 1096 * A dying jail might be resurrected 1097 * (via attach or persist), but first 1098 * it must determine if another jail 1099 * has claimed its name. Accomplish 1100 * this by implicitly re-setting the 1101 * name. 1102 */ 1103 if (name == NULL) 1104 name = prison_name(mypr, pr); 1105 } 1106 } 1107 } 1108 if (pr == NULL) { 1109 /* Update: jid must exist. */ 1110 if (cuflags == JAIL_UPDATE) { 1111 error = ENOENT; 1112 vfs_opterror(opts, "jail %d not found", jid); 1113 goto done_unlock_list; 1114 } 1115 } 1116 } 1117 /* 1118 * If the caller provided a name, look for a jail by that name. 1119 * This has different semantics for creates and updates keyed by jid 1120 * (where the name must not already exist in a different jail), 1121 * and updates keyed by the name itself (where the name must exist 1122 * because that is the jail being updated). 1123 */ 1124 if (name != NULL) { 1125 namelc = strrchr(name, '.'); 1126 if (namelc == NULL) 1127 namelc = name; 1128 else { 1129 /* 1130 * This is a hierarchical name. Split it into the 1131 * parent and child names, and make sure the parent 1132 * exists or matches an already found jail. 1133 */ 1134 *namelc = '\0'; 1135 if (pr != NULL) { 1136 if (strncmp(name, ppr->pr_name, namelc - name) 1137 || ppr->pr_name[namelc - name] != '\0') { 1138 mtx_unlock(&pr->pr_mtx); 1139 error = EINVAL; 1140 vfs_opterror(opts, 1141 "cannot change jail's parent"); 1142 goto done_unlock_list; 1143 } 1144 } else { 1145 ppr = prison_find_name(mypr, name); 1146 if (ppr == NULL) { 1147 error = ENOENT; 1148 vfs_opterror(opts, 1149 "jail \"%s\" not found", name); 1150 goto done_unlock_list; 1151 } 1152 mtx_unlock(&ppr->pr_mtx); 1153 } 1154 name = ++namelc; 1155 } 1156 if (name[0] != '\0') { 1157 namelen = 1158 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1159 name_again: 1160 deadpr = NULL; 1161 FOREACH_PRISON_CHILD(ppr, tpr) { 1162 if (tpr != pr && tpr->pr_ref > 0 && 1163 !strcmp(tpr->pr_name + namelen, name)) { 1164 if (pr == NULL && 1165 cuflags != JAIL_CREATE) { 1166 mtx_lock(&tpr->pr_mtx); 1167 if (tpr->pr_ref > 0) { 1168 /* 1169 * Use this jail 1170 * for updates. 1171 */ 1172 if (tpr->pr_uref > 0) { 1173 pr = tpr; 1174 break; 1175 } 1176 deadpr = tpr; 1177 } 1178 mtx_unlock(&tpr->pr_mtx); 1179 } else if (tpr->pr_uref > 0) { 1180 /* 1181 * Create, or update(jid): 1182 * name must not exist in an 1183 * active sibling jail. 1184 */ 1185 error = EEXIST; 1186 if (pr != NULL) 1187 mtx_unlock(&pr->pr_mtx); 1188 vfs_opterror(opts, 1189 "jail \"%s\" already exists", 1190 name); 1191 goto done_unlock_list; 1192 } 1193 } 1194 } 1195 /* If no active jail is found, use a dying one. */ 1196 if (deadpr != NULL && pr == NULL) { 1197 if (flags & JAIL_DYING) { 1198 mtx_lock(&deadpr->pr_mtx); 1199 if (deadpr->pr_ref == 0) { 1200 mtx_unlock(&deadpr->pr_mtx); 1201 goto name_again; 1202 } 1203 pr = deadpr; 1204 } else if (cuflags == JAIL_UPDATE) { 1205 error = ENOENT; 1206 vfs_opterror(opts, 1207 "jail \"%s\" is dying", name); 1208 goto done_unlock_list; 1209 } 1210 } 1211 /* Update: name must exist if no jid. */ 1212 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1213 error = ENOENT; 1214 vfs_opterror(opts, "jail \"%s\" not found", 1215 name); 1216 goto done_unlock_list; 1217 } 1218 } 1219 } 1220 /* Update: must provide a jid or name. */ 1221 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1222 error = ENOENT; 1223 vfs_opterror(opts, "update specified no jail"); 1224 goto done_unlock_list; 1225 } 1226 1227 /* If there's no prison to update, create a new one and link it in. */ 1228 if (pr == NULL) { 1229 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1230 if (tpr->pr_childcount >= tpr->pr_childmax) { 1231 error = EPERM; 1232 vfs_opterror(opts, "prison limit exceeded"); 1233 goto done_unlock_list; 1234 } 1235 created = 1; 1236 mtx_lock(&ppr->pr_mtx); 1237 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) { 1238 mtx_unlock(&ppr->pr_mtx); 1239 error = ENOENT; 1240 vfs_opterror(opts, "parent jail went away!"); 1241 goto done_unlock_list; 1242 } 1243 ppr->pr_ref++; 1244 ppr->pr_uref++; 1245 mtx_unlock(&ppr->pr_mtx); 1246 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1247 if (jid == 0) { 1248 /* Find the next free jid. */ 1249 jid = lastprid + 1; 1250 findnext: 1251 if (jid == JAIL_MAX) 1252 jid = 1; 1253 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1254 if (tpr->pr_id < jid) 1255 continue; 1256 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1257 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1258 break; 1259 } 1260 if (jid == lastprid) { 1261 error = EAGAIN; 1262 vfs_opterror(opts, 1263 "no available jail IDs"); 1264 free(pr, M_PRISON); 1265 prison_deref(ppr, PD_DEREF | 1266 PD_DEUREF | PD_LIST_XLOCKED); 1267 goto done_releroot; 1268 } 1269 jid++; 1270 goto findnext; 1271 } 1272 lastprid = jid; 1273 } else { 1274 /* 1275 * The jail already has a jid (that did not yet exist), 1276 * so just find where to insert it. 1277 */ 1278 TAILQ_FOREACH(tpr, &allprison, pr_list) 1279 if (tpr->pr_id >= jid) { 1280 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1281 break; 1282 } 1283 } 1284 if (tpr == NULL) 1285 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1286 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1287 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1288 tpr->pr_childcount++; 1289 1290 pr->pr_parent = ppr; 1291 pr->pr_id = jid; 1292 1293 /* Set some default values, and inherit some from the parent. */ 1294 if (name == NULL) 1295 name = ""; 1296 if (path == NULL) { 1297 path = "/"; 1298 root = mypr->pr_root; 1299 vref(root); 1300 } 1301 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1302 pr->pr_flags |= PR_HOST; 1303 #if defined(INET) || defined(INET6) 1304 #ifdef VIMAGE 1305 if (!(pr_flags & PR_VNET)) 1306 #endif 1307 { 1308 #ifdef INET 1309 if (!(ch_flags & PR_IP4_USER)) 1310 pr->pr_flags |= 1311 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE; 1312 else if (!(pr_flags & PR_IP4_USER)) { 1313 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1314 if (ppr->pr_ip4 != NULL) { 1315 pr->pr_ip4s = ppr->pr_ip4s; 1316 pr->pr_ip4 = malloc(pr->pr_ip4s * 1317 sizeof(struct in_addr), M_PRISON, 1318 M_WAITOK); 1319 bcopy(ppr->pr_ip4, pr->pr_ip4, 1320 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1321 } 1322 } 1323 #endif 1324 #ifdef INET6 1325 if (!(ch_flags & PR_IP6_USER)) 1326 pr->pr_flags |= 1327 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE; 1328 else if (!(pr_flags & PR_IP6_USER)) { 1329 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1330 if (ppr->pr_ip6 != NULL) { 1331 pr->pr_ip6s = ppr->pr_ip6s; 1332 pr->pr_ip6 = malloc(pr->pr_ip6s * 1333 sizeof(struct in6_addr), M_PRISON, 1334 M_WAITOK); 1335 bcopy(ppr->pr_ip6, pr->pr_ip6, 1336 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1337 } 1338 } 1339 #endif 1340 } 1341 #endif 1342 /* Source address selection is always on by default. */ 1343 pr->pr_flags |= _PR_IP_SADDRSEL; 1344 1345 pr->pr_securelevel = ppr->pr_securelevel; 1346 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1347 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 1348 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1349 1350 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate; 1351 if (osrelstr == NULL) 1352 strcpy(pr->pr_osrelease, ppr->pr_osrelease); 1353 else 1354 strcpy(pr->pr_osrelease, osrelstr); 1355 1356 LIST_INIT(&pr->pr_children); 1357 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1358 1359 #ifdef VIMAGE 1360 /* Allocate a new vnet if specified. */ 1361 pr->pr_vnet = (pr_flags & PR_VNET) 1362 ? vnet_alloc() : ppr->pr_vnet; 1363 #endif 1364 /* 1365 * Allocate a dedicated cpuset for each jail. 1366 * Unlike other initial settings, this may return an erorr. 1367 */ 1368 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1369 if (error) { 1370 prison_deref(pr, PD_LIST_XLOCKED); 1371 goto done_releroot; 1372 } 1373 1374 mtx_lock(&pr->pr_mtx); 1375 /* 1376 * New prisons do not yet have a reference, because we do not 1377 * want other to see the incomplete prison once the 1378 * allprison_lock is downgraded. 1379 */ 1380 } else { 1381 created = 0; 1382 /* 1383 * Grab a reference for existing prisons, to ensure they 1384 * continue to exist for the duration of the call. 1385 */ 1386 pr->pr_ref++; 1387 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1388 if ((pr->pr_flags & PR_VNET) && 1389 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1390 error = EINVAL; 1391 vfs_opterror(opts, 1392 "vnet jails cannot have IP address restrictions"); 1393 goto done_deref_locked; 1394 } 1395 #endif 1396 #ifdef INET 1397 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1398 error = EINVAL; 1399 vfs_opterror(opts, 1400 "ip4 cannot be changed after creation"); 1401 goto done_deref_locked; 1402 } 1403 #endif 1404 #ifdef INET6 1405 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1406 error = EINVAL; 1407 vfs_opterror(opts, 1408 "ip6 cannot be changed after creation"); 1409 goto done_deref_locked; 1410 } 1411 #endif 1412 } 1413 1414 /* Do final error checking before setting anything. */ 1415 if (gotslevel) { 1416 if (slevel < ppr->pr_securelevel) { 1417 error = EPERM; 1418 goto done_deref_locked; 1419 } 1420 } 1421 if (gotchildmax) { 1422 if (childmax >= ppr->pr_childmax) { 1423 error = EPERM; 1424 goto done_deref_locked; 1425 } 1426 } 1427 if (gotenforce) { 1428 if (enforce < ppr->pr_enforce_statfs) { 1429 error = EPERM; 1430 goto done_deref_locked; 1431 } 1432 } 1433 if (gotrsnum) { 1434 /* 1435 * devfs_rsnum is a uint16_t 1436 */ 1437 if (rsnum < 0 || rsnum > 65535) { 1438 error = EINVAL; 1439 goto done_deref_locked; 1440 } 1441 /* 1442 * Nested jails always inherit parent's devfs ruleset 1443 */ 1444 if (jailed(td->td_ucred)) { 1445 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1446 error = EPERM; 1447 goto done_deref_locked; 1448 } else 1449 rsnum = ppr->pr_devfs_rsnum; 1450 } 1451 } 1452 #ifdef INET 1453 if (ip4s > 0) { 1454 if (ppr->pr_flags & PR_IP4) { 1455 /* 1456 * Make sure the new set of IP addresses is a 1457 * subset of the parent's list. Don't worry 1458 * about the parent being unlocked, as any 1459 * setting is done with allprison_lock held. 1460 */ 1461 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1462 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1463 break; 1464 if (ij == ppr->pr_ip4s) { 1465 error = EPERM; 1466 goto done_deref_locked; 1467 } 1468 if (ip4s > 1) { 1469 for (ii = ij = 1; ii < ip4s; ii++) { 1470 if (ip4[ii].s_addr == 1471 ppr->pr_ip4[0].s_addr) 1472 continue; 1473 for (; ij < ppr->pr_ip4s; ij++) 1474 if (ip4[ii].s_addr == 1475 ppr->pr_ip4[ij].s_addr) 1476 break; 1477 if (ij == ppr->pr_ip4s) 1478 break; 1479 } 1480 if (ij == ppr->pr_ip4s) { 1481 error = EPERM; 1482 goto done_deref_locked; 1483 } 1484 } 1485 } 1486 /* 1487 * Check for conflicting IP addresses. We permit them 1488 * if there is no more than one IP on each jail. If 1489 * there is a duplicate on a jail with more than one 1490 * IP stop checking and return error. 1491 */ 1492 tppr = ppr; 1493 #ifdef VIMAGE 1494 for (; tppr != &prison0; tppr = tppr->pr_parent) 1495 if (tppr->pr_flags & PR_VNET) 1496 break; 1497 #endif 1498 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1499 if (tpr == pr || 1500 #ifdef VIMAGE 1501 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1502 #endif 1503 tpr->pr_uref == 0) { 1504 descend = 0; 1505 continue; 1506 } 1507 if (!(tpr->pr_flags & PR_IP4_USER)) 1508 continue; 1509 descend = 0; 1510 if (tpr->pr_ip4 == NULL || 1511 (ip4s == 1 && tpr->pr_ip4s == 1)) 1512 continue; 1513 for (ii = 0; ii < ip4s; ii++) { 1514 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1515 error = EADDRINUSE; 1516 vfs_opterror(opts, 1517 "IPv4 addresses clash"); 1518 goto done_deref_locked; 1519 } 1520 } 1521 } 1522 } 1523 #endif 1524 #ifdef INET6 1525 if (ip6s > 0) { 1526 if (ppr->pr_flags & PR_IP6) { 1527 /* 1528 * Make sure the new set of IP addresses is a 1529 * subset of the parent's list. 1530 */ 1531 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1532 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1533 &ppr->pr_ip6[ij])) 1534 break; 1535 if (ij == ppr->pr_ip6s) { 1536 error = EPERM; 1537 goto done_deref_locked; 1538 } 1539 if (ip6s > 1) { 1540 for (ii = ij = 1; ii < ip6s; ii++) { 1541 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1542 &ppr->pr_ip6[0])) 1543 continue; 1544 for (; ij < ppr->pr_ip6s; ij++) 1545 if (IN6_ARE_ADDR_EQUAL( 1546 &ip6[ii], &ppr->pr_ip6[ij])) 1547 break; 1548 if (ij == ppr->pr_ip6s) 1549 break; 1550 } 1551 if (ij == ppr->pr_ip6s) { 1552 error = EPERM; 1553 goto done_deref_locked; 1554 } 1555 } 1556 } 1557 /* Check for conflicting IP addresses. */ 1558 tppr = ppr; 1559 #ifdef VIMAGE 1560 for (; tppr != &prison0; tppr = tppr->pr_parent) 1561 if (tppr->pr_flags & PR_VNET) 1562 break; 1563 #endif 1564 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1565 if (tpr == pr || 1566 #ifdef VIMAGE 1567 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1568 #endif 1569 tpr->pr_uref == 0) { 1570 descend = 0; 1571 continue; 1572 } 1573 if (!(tpr->pr_flags & PR_IP6_USER)) 1574 continue; 1575 descend = 0; 1576 if (tpr->pr_ip6 == NULL || 1577 (ip6s == 1 && tpr->pr_ip6s == 1)) 1578 continue; 1579 for (ii = 0; ii < ip6s; ii++) { 1580 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1581 error = EADDRINUSE; 1582 vfs_opterror(opts, 1583 "IPv6 addresses clash"); 1584 goto done_deref_locked; 1585 } 1586 } 1587 } 1588 } 1589 #endif 1590 onamelen = namelen = 0; 1591 if (name != NULL) { 1592 /* Give a default name of the jid. Also allow the name to be 1593 * explicitly the jid - but not any other number, and only in 1594 * normal form (no leading zero/etc). 1595 */ 1596 if (name[0] == '\0') 1597 snprintf(name = numbuf, sizeof(numbuf), "%d", jid); 1598 else if ((strtoul(namelc, &p, 10) != jid || 1599 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') { 1600 error = EINVAL; 1601 vfs_opterror(opts, 1602 "name cannot be numeric (unless it is the jid)"); 1603 goto done_deref_locked; 1604 } 1605 /* 1606 * Make sure the name isn't too long for the prison or its 1607 * children. 1608 */ 1609 onamelen = strlen(pr->pr_name); 1610 namelen = strlen(name); 1611 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) { 1612 error = ENAMETOOLONG; 1613 goto done_deref_locked; 1614 } 1615 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1616 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1617 sizeof(pr->pr_name)) { 1618 error = ENAMETOOLONG; 1619 goto done_deref_locked; 1620 } 1621 } 1622 } 1623 if (pr_allow & ~ppr->pr_allow) { 1624 error = EPERM; 1625 goto done_deref_locked; 1626 } 1627 1628 /* Set the parameters of the prison. */ 1629 #ifdef INET 1630 redo_ip4 = 0; 1631 if (pr_flags & PR_IP4_USER) { 1632 pr->pr_flags |= PR_IP4; 1633 free(pr->pr_ip4, M_PRISON); 1634 pr->pr_ip4s = ip4s; 1635 pr->pr_ip4 = ip4; 1636 ip4 = NULL; 1637 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1638 #ifdef VIMAGE 1639 if (tpr->pr_flags & PR_VNET) { 1640 descend = 0; 1641 continue; 1642 } 1643 #endif 1644 if (prison_restrict_ip4(tpr, NULL)) { 1645 redo_ip4 = 1; 1646 descend = 0; 1647 } 1648 } 1649 } 1650 #endif 1651 #ifdef INET6 1652 redo_ip6 = 0; 1653 if (pr_flags & PR_IP6_USER) { 1654 pr->pr_flags |= PR_IP6; 1655 free(pr->pr_ip6, M_PRISON); 1656 pr->pr_ip6s = ip6s; 1657 pr->pr_ip6 = ip6; 1658 ip6 = NULL; 1659 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1660 #ifdef VIMAGE 1661 if (tpr->pr_flags & PR_VNET) { 1662 descend = 0; 1663 continue; 1664 } 1665 #endif 1666 if (prison_restrict_ip6(tpr, NULL)) { 1667 redo_ip6 = 1; 1668 descend = 0; 1669 } 1670 } 1671 } 1672 #endif 1673 if (gotslevel) { 1674 pr->pr_securelevel = slevel; 1675 /* Set all child jails to be at least this level. */ 1676 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1677 if (tpr->pr_securelevel < slevel) 1678 tpr->pr_securelevel = slevel; 1679 } 1680 if (gotchildmax) { 1681 pr->pr_childmax = childmax; 1682 /* Set all child jails to under this limit. */ 1683 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1684 if (tpr->pr_childmax > childmax - level) 1685 tpr->pr_childmax = childmax > level 1686 ? childmax - level : 0; 1687 } 1688 if (gotenforce) { 1689 pr->pr_enforce_statfs = enforce; 1690 /* Pass this restriction on to the children. */ 1691 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1692 if (tpr->pr_enforce_statfs < enforce) 1693 tpr->pr_enforce_statfs = enforce; 1694 } 1695 if (gotrsnum) { 1696 pr->pr_devfs_rsnum = rsnum; 1697 /* Pass this restriction on to the children. */ 1698 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1699 tpr->pr_devfs_rsnum = rsnum; 1700 } 1701 if (name != NULL) { 1702 if (ppr == &prison0) 1703 strlcpy(pr->pr_name, name, sizeof(pr->pr_name)); 1704 else 1705 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1706 ppr->pr_name, name); 1707 /* Change this component of child names. */ 1708 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1709 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1710 strlen(tpr->pr_name + onamelen) + 1); 1711 bcopy(pr->pr_name, tpr->pr_name, namelen); 1712 } 1713 } 1714 if (path != NULL) { 1715 /* Try to keep a real-rooted full pathname. */ 1716 if (fullpath_disabled && path[0] == '/' && 1717 strcmp(mypr->pr_path, "/")) 1718 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1719 mypr->pr_path, path); 1720 else 1721 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1722 pr->pr_root = root; 1723 } 1724 if (PR_HOST & ch_flags & ~pr_flags) { 1725 if (pr->pr_flags & PR_HOST) { 1726 /* 1727 * Copy the parent's host info. As with pr_ip4 above, 1728 * the lack of a lock on the parent is not a problem; 1729 * it is always set with allprison_lock at least 1730 * shared, and is held exclusively here. 1731 */ 1732 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1733 sizeof(pr->pr_hostname)); 1734 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1735 sizeof(pr->pr_domainname)); 1736 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1737 sizeof(pr->pr_hostuuid)); 1738 pr->pr_hostid = pr->pr_parent->pr_hostid; 1739 } 1740 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1741 /* Set this prison, and any descendants without PR_HOST. */ 1742 if (host != NULL) 1743 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1744 if (domain != NULL) 1745 strlcpy(pr->pr_domainname, domain, 1746 sizeof(pr->pr_domainname)); 1747 if (uuid != NULL) 1748 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1749 if (gothid) 1750 pr->pr_hostid = hid; 1751 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1752 if (tpr->pr_flags & PR_HOST) 1753 descend = 0; 1754 else { 1755 if (host != NULL) 1756 strlcpy(tpr->pr_hostname, 1757 pr->pr_hostname, 1758 sizeof(tpr->pr_hostname)); 1759 if (domain != NULL) 1760 strlcpy(tpr->pr_domainname, 1761 pr->pr_domainname, 1762 sizeof(tpr->pr_domainname)); 1763 if (uuid != NULL) 1764 strlcpy(tpr->pr_hostuuid, 1765 pr->pr_hostuuid, 1766 sizeof(tpr->pr_hostuuid)); 1767 if (gothid) 1768 tpr->pr_hostid = hid; 1769 } 1770 } 1771 } 1772 if ((tallow = ch_allow & ~pr_allow)) { 1773 /* Clear allow bits in all children. */ 1774 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1775 tpr->pr_allow &= ~tallow; 1776 } 1777 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1778 /* 1779 * Persistent prisons get an extra reference, and prisons losing their 1780 * persist flag lose that reference. Only do this for existing prisons 1781 * for now, so new ones will remain unseen until after the module 1782 * handlers have completed. 1783 */ 1784 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1785 if (pr_flags & PR_PERSIST) { 1786 pr->pr_ref++; 1787 pr->pr_uref++; 1788 } else { 1789 pr->pr_ref--; 1790 pr->pr_uref--; 1791 } 1792 } 1793 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1794 mtx_unlock(&pr->pr_mtx); 1795 1796 #ifdef RACCT 1797 if (racct_enable && created) 1798 prison_racct_attach(pr); 1799 #endif 1800 1801 /* Locks may have prevented a complete restriction of child IP 1802 * addresses. If so, allocate some more memory and try again. 1803 */ 1804 #ifdef INET 1805 while (redo_ip4) { 1806 ip4s = pr->pr_ip4s; 1807 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1808 mtx_lock(&pr->pr_mtx); 1809 redo_ip4 = 0; 1810 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1811 #ifdef VIMAGE 1812 if (tpr->pr_flags & PR_VNET) { 1813 descend = 0; 1814 continue; 1815 } 1816 #endif 1817 if (prison_restrict_ip4(tpr, ip4)) { 1818 if (ip4 != NULL) 1819 ip4 = NULL; 1820 else 1821 redo_ip4 = 1; 1822 } 1823 } 1824 mtx_unlock(&pr->pr_mtx); 1825 } 1826 #endif 1827 #ifdef INET6 1828 while (redo_ip6) { 1829 ip6s = pr->pr_ip6s; 1830 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1831 mtx_lock(&pr->pr_mtx); 1832 redo_ip6 = 0; 1833 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1834 #ifdef VIMAGE 1835 if (tpr->pr_flags & PR_VNET) { 1836 descend = 0; 1837 continue; 1838 } 1839 #endif 1840 if (prison_restrict_ip6(tpr, ip6)) { 1841 if (ip6 != NULL) 1842 ip6 = NULL; 1843 else 1844 redo_ip6 = 1; 1845 } 1846 } 1847 mtx_unlock(&pr->pr_mtx); 1848 } 1849 #endif 1850 1851 /* Let the modules do their work. */ 1852 sx_downgrade(&allprison_lock); 1853 if (created) { 1854 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1855 if (error) { 1856 prison_deref(pr, PD_LIST_SLOCKED); 1857 goto done_errmsg; 1858 } 1859 } 1860 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1861 if (error) { 1862 prison_deref(pr, created 1863 ? PD_LIST_SLOCKED 1864 : PD_DEREF | PD_LIST_SLOCKED); 1865 goto done_errmsg; 1866 } 1867 1868 /* Attach this process to the prison if requested. */ 1869 if (flags & JAIL_ATTACH) { 1870 mtx_lock(&pr->pr_mtx); 1871 error = do_jail_attach(td, pr); 1872 if (error) { 1873 vfs_opterror(opts, "attach failed"); 1874 if (!created) 1875 prison_deref(pr, PD_DEREF); 1876 goto done_errmsg; 1877 } 1878 } 1879 1880 #ifdef RACCT 1881 if (racct_enable && !created) { 1882 if (!(flags & JAIL_ATTACH)) 1883 sx_sunlock(&allprison_lock); 1884 prison_racct_modify(pr); 1885 if (!(flags & JAIL_ATTACH)) 1886 sx_slock(&allprison_lock); 1887 } 1888 #endif 1889 1890 td->td_retval[0] = pr->pr_id; 1891 1892 /* 1893 * Now that it is all there, drop the temporary reference from existing 1894 * prisons. Or add a reference to newly created persistent prisons 1895 * (which was not done earlier so that the prison would not be publicly 1896 * visible). 1897 */ 1898 if (!created) { 1899 prison_deref(pr, (flags & JAIL_ATTACH) 1900 ? PD_DEREF 1901 : PD_DEREF | PD_LIST_SLOCKED); 1902 } else { 1903 if (pr_flags & PR_PERSIST) { 1904 mtx_lock(&pr->pr_mtx); 1905 pr->pr_ref++; 1906 pr->pr_uref++; 1907 mtx_unlock(&pr->pr_mtx); 1908 } 1909 if (!(flags & JAIL_ATTACH)) 1910 sx_sunlock(&allprison_lock); 1911 } 1912 1913 goto done_errmsg; 1914 1915 done_deref_locked: 1916 prison_deref(pr, created 1917 ? PD_LOCKED | PD_LIST_XLOCKED 1918 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1919 goto done_releroot; 1920 done_unlock_list: 1921 sx_xunlock(&allprison_lock); 1922 done_releroot: 1923 if (root != NULL) 1924 vrele(root); 1925 done_errmsg: 1926 if (error) { 1927 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 1928 if (errmsg_len > 0) { 1929 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1930 if (errmsg_pos > 0) { 1931 if (optuio->uio_segflg == UIO_SYSSPACE) 1932 bcopy(errmsg, 1933 optuio->uio_iov[errmsg_pos].iov_base, 1934 errmsg_len); 1935 else 1936 copyout(errmsg, 1937 optuio->uio_iov[errmsg_pos].iov_base, 1938 errmsg_len); 1939 } 1940 } 1941 } 1942 done_free: 1943 #ifdef INET 1944 free(ip4, M_PRISON); 1945 #endif 1946 #ifdef INET6 1947 free(ip6, M_PRISON); 1948 #endif 1949 if (g_path != NULL) 1950 free(g_path, M_TEMP); 1951 vfs_freeopts(opts); 1952 return (error); 1953 } 1954 1955 1956 /* 1957 * struct jail_get_args { 1958 * struct iovec *iovp; 1959 * unsigned int iovcnt; 1960 * int flags; 1961 * }; 1962 */ 1963 int 1964 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1965 { 1966 struct uio *auio; 1967 int error; 1968 1969 /* Check that we have an even number of iovecs. */ 1970 if (uap->iovcnt & 1) 1971 return (EINVAL); 1972 1973 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1974 if (error) 1975 return (error); 1976 error = kern_jail_get(td, auio, uap->flags); 1977 if (error == 0) 1978 error = copyout(auio->uio_iov, uap->iovp, 1979 uap->iovcnt * sizeof (struct iovec)); 1980 free(auio, M_IOV); 1981 return (error); 1982 } 1983 1984 int 1985 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1986 { 1987 struct prison *pr, *mypr; 1988 struct vfsopt *opt; 1989 struct vfsoptlist *opts; 1990 char *errmsg, *name; 1991 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1992 1993 if (flags & ~JAIL_GET_MASK) 1994 return (EINVAL); 1995 1996 /* Get the parameter list. */ 1997 error = vfs_buildopts(optuio, &opts); 1998 if (error) 1999 return (error); 2000 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 2001 mypr = td->td_ucred->cr_prison; 2002 2003 /* 2004 * Find the prison specified by one of: lastjid, jid, name. 2005 */ 2006 sx_slock(&allprison_lock); 2007 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 2008 if (error == 0) { 2009 TAILQ_FOREACH(pr, &allprison, pr_list) { 2010 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 2011 mtx_lock(&pr->pr_mtx); 2012 if (pr->pr_ref > 0 && 2013 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 2014 break; 2015 mtx_unlock(&pr->pr_mtx); 2016 } 2017 } 2018 if (pr != NULL) 2019 goto found_prison; 2020 error = ENOENT; 2021 vfs_opterror(opts, "no jail after %d", jid); 2022 goto done_unlock_list; 2023 } else if (error != ENOENT) 2024 goto done_unlock_list; 2025 2026 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 2027 if (error == 0) { 2028 if (jid != 0) { 2029 pr = prison_find_child(mypr, jid); 2030 if (pr != NULL) { 2031 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2032 mtx_unlock(&pr->pr_mtx); 2033 error = ENOENT; 2034 vfs_opterror(opts, "jail %d is dying", 2035 jid); 2036 goto done_unlock_list; 2037 } 2038 goto found_prison; 2039 } 2040 error = ENOENT; 2041 vfs_opterror(opts, "jail %d not found", jid); 2042 goto done_unlock_list; 2043 } 2044 } else if (error != ENOENT) 2045 goto done_unlock_list; 2046 2047 error = vfs_getopt(opts, "name", (void **)&name, &len); 2048 if (error == 0) { 2049 if (len == 0 || name[len - 1] != '\0') { 2050 error = EINVAL; 2051 goto done_unlock_list; 2052 } 2053 pr = prison_find_name(mypr, name); 2054 if (pr != NULL) { 2055 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 2056 mtx_unlock(&pr->pr_mtx); 2057 error = ENOENT; 2058 vfs_opterror(opts, "jail \"%s\" is dying", 2059 name); 2060 goto done_unlock_list; 2061 } 2062 goto found_prison; 2063 } 2064 error = ENOENT; 2065 vfs_opterror(opts, "jail \"%s\" not found", name); 2066 goto done_unlock_list; 2067 } else if (error != ENOENT) 2068 goto done_unlock_list; 2069 2070 vfs_opterror(opts, "no jail specified"); 2071 error = ENOENT; 2072 goto done_unlock_list; 2073 2074 found_prison: 2075 /* Get the parameters of the prison. */ 2076 pr->pr_ref++; 2077 locked = PD_LOCKED; 2078 td->td_retval[0] = pr->pr_id; 2079 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2080 if (error != 0 && error != ENOENT) 2081 goto done_deref; 2082 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2083 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2084 if (error != 0 && error != ENOENT) 2085 goto done_deref; 2086 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2087 if (error != 0 && error != ENOENT) 2088 goto done_deref; 2089 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2090 sizeof(pr->pr_cpuset->cs_id)); 2091 if (error != 0 && error != ENOENT) 2092 goto done_deref; 2093 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2094 if (error != 0 && error != ENOENT) 2095 goto done_deref; 2096 #ifdef INET 2097 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2098 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2099 if (error != 0 && error != ENOENT) 2100 goto done_deref; 2101 #endif 2102 #ifdef INET6 2103 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2104 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2105 if (error != 0 && error != ENOENT) 2106 goto done_deref; 2107 #endif 2108 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2109 sizeof(pr->pr_securelevel)); 2110 if (error != 0 && error != ENOENT) 2111 goto done_deref; 2112 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2113 sizeof(pr->pr_childcount)); 2114 if (error != 0 && error != ENOENT) 2115 goto done_deref; 2116 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2117 sizeof(pr->pr_childmax)); 2118 if (error != 0 && error != ENOENT) 2119 goto done_deref; 2120 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2121 if (error != 0 && error != ENOENT) 2122 goto done_deref; 2123 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2124 if (error != 0 && error != ENOENT) 2125 goto done_deref; 2126 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2127 if (error != 0 && error != ENOENT) 2128 goto done_deref; 2129 #ifdef COMPAT_FREEBSD32 2130 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2131 uint32_t hid32 = pr->pr_hostid; 2132 2133 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2134 } else 2135 #endif 2136 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2137 sizeof(pr->pr_hostid)); 2138 if (error != 0 && error != ENOENT) 2139 goto done_deref; 2140 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2141 sizeof(pr->pr_enforce_statfs)); 2142 if (error != 0 && error != ENOENT) 2143 goto done_deref; 2144 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2145 sizeof(pr->pr_devfs_rsnum)); 2146 if (error != 0 && error != ENOENT) 2147 goto done_deref; 2148 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 2149 fi++) { 2150 if (pr_flag_names[fi] == NULL) 2151 continue; 2152 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 2153 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 2154 if (error != 0 && error != ENOENT) 2155 goto done_deref; 2156 i = !i; 2157 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 2158 if (error != 0 && error != ENOENT) 2159 goto done_deref; 2160 } 2161 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 2162 fi++) { 2163 i = pr->pr_flags & 2164 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2165 i = pr_flag_jailsys[fi].disable && 2166 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2167 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2168 : JAIL_SYS_INHERIT; 2169 error = 2170 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2171 if (error != 0 && error != ENOENT) 2172 goto done_deref; 2173 } 2174 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 2175 fi++) { 2176 if (pr_allow_names[fi] == NULL) 2177 continue; 2178 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2179 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2180 if (error != 0 && error != ENOENT) 2181 goto done_deref; 2182 i = !i; 2183 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2184 if (error != 0 && error != ENOENT) 2185 goto done_deref; 2186 } 2187 i = (pr->pr_uref == 0); 2188 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2189 if (error != 0 && error != ENOENT) 2190 goto done_deref; 2191 i = !i; 2192 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2193 if (error != 0 && error != ENOENT) 2194 goto done_deref; 2195 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate, 2196 sizeof(pr->pr_osreldate)); 2197 if (error != 0 && error != ENOENT) 2198 goto done_deref; 2199 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease); 2200 if (error != 0 && error != ENOENT) 2201 goto done_deref; 2202 2203 /* Get the module parameters. */ 2204 mtx_unlock(&pr->pr_mtx); 2205 locked = 0; 2206 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2207 if (error) 2208 goto done_deref; 2209 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2210 2211 /* By now, all parameters should have been noted. */ 2212 TAILQ_FOREACH(opt, opts, link) { 2213 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2214 error = EINVAL; 2215 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2216 goto done_errmsg; 2217 } 2218 } 2219 2220 /* Write the fetched parameters back to userspace. */ 2221 error = 0; 2222 TAILQ_FOREACH(opt, opts, link) { 2223 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2224 pos = 2 * opt->pos + 1; 2225 optuio->uio_iov[pos].iov_len = opt->len; 2226 if (opt->value != NULL) { 2227 if (optuio->uio_segflg == UIO_SYSSPACE) { 2228 bcopy(opt->value, 2229 optuio->uio_iov[pos].iov_base, 2230 opt->len); 2231 } else { 2232 error = copyout(opt->value, 2233 optuio->uio_iov[pos].iov_base, 2234 opt->len); 2235 if (error) 2236 break; 2237 } 2238 } 2239 } 2240 } 2241 goto done_errmsg; 2242 2243 done_deref: 2244 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2245 goto done_errmsg; 2246 2247 done_unlock_list: 2248 sx_sunlock(&allprison_lock); 2249 done_errmsg: 2250 if (error && errmsg_pos >= 0) { 2251 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2252 errmsg_pos = 2 * errmsg_pos + 1; 2253 if (errmsg_len > 0) { 2254 if (optuio->uio_segflg == UIO_SYSSPACE) 2255 bcopy(errmsg, 2256 optuio->uio_iov[errmsg_pos].iov_base, 2257 errmsg_len); 2258 else 2259 copyout(errmsg, 2260 optuio->uio_iov[errmsg_pos].iov_base, 2261 errmsg_len); 2262 } 2263 } 2264 vfs_freeopts(opts); 2265 return (error); 2266 } 2267 2268 2269 /* 2270 * struct jail_remove_args { 2271 * int jid; 2272 * }; 2273 */ 2274 int 2275 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2276 { 2277 struct prison *pr, *cpr, *lpr, *tpr; 2278 int descend, error; 2279 2280 error = priv_check(td, PRIV_JAIL_REMOVE); 2281 if (error) 2282 return (error); 2283 2284 sx_xlock(&allprison_lock); 2285 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2286 if (pr == NULL) { 2287 sx_xunlock(&allprison_lock); 2288 return (EINVAL); 2289 } 2290 2291 /* Remove all descendants of this prison, then remove this prison. */ 2292 pr->pr_ref++; 2293 pr->pr_flags |= PR_REMOVE; 2294 if (!LIST_EMPTY(&pr->pr_children)) { 2295 mtx_unlock(&pr->pr_mtx); 2296 lpr = NULL; 2297 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2298 mtx_lock(&cpr->pr_mtx); 2299 if (cpr->pr_ref > 0) { 2300 tpr = cpr; 2301 cpr->pr_ref++; 2302 cpr->pr_flags |= PR_REMOVE; 2303 } else { 2304 /* Already removed - do not do it again. */ 2305 tpr = NULL; 2306 } 2307 mtx_unlock(&cpr->pr_mtx); 2308 if (lpr != NULL) { 2309 mtx_lock(&lpr->pr_mtx); 2310 prison_remove_one(lpr); 2311 sx_xlock(&allprison_lock); 2312 } 2313 lpr = tpr; 2314 } 2315 if (lpr != NULL) { 2316 mtx_lock(&lpr->pr_mtx); 2317 prison_remove_one(lpr); 2318 sx_xlock(&allprison_lock); 2319 } 2320 mtx_lock(&pr->pr_mtx); 2321 } 2322 prison_remove_one(pr); 2323 return (0); 2324 } 2325 2326 static void 2327 prison_remove_one(struct prison *pr) 2328 { 2329 struct proc *p; 2330 int deuref; 2331 2332 /* If the prison was persistent, it is not anymore. */ 2333 deuref = 0; 2334 if (pr->pr_flags & PR_PERSIST) { 2335 pr->pr_ref--; 2336 deuref = PD_DEUREF; 2337 pr->pr_flags &= ~PR_PERSIST; 2338 } 2339 2340 /* 2341 * jail_remove added a reference. If that's the only one, remove 2342 * the prison now. 2343 */ 2344 KASSERT(pr->pr_ref > 0, 2345 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2346 if (pr->pr_ref == 1) { 2347 prison_deref(pr, 2348 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2349 return; 2350 } 2351 2352 mtx_unlock(&pr->pr_mtx); 2353 sx_xunlock(&allprison_lock); 2354 /* 2355 * Kill all processes unfortunate enough to be attached to this prison. 2356 */ 2357 sx_slock(&allproc_lock); 2358 LIST_FOREACH(p, &allproc, p_list) { 2359 PROC_LOCK(p); 2360 if (p->p_state != PRS_NEW && p->p_ucred && 2361 p->p_ucred->cr_prison == pr) 2362 kern_psignal(p, SIGKILL); 2363 PROC_UNLOCK(p); 2364 } 2365 sx_sunlock(&allproc_lock); 2366 /* Remove the temporary reference added by jail_remove. */ 2367 prison_deref(pr, deuref | PD_DEREF); 2368 } 2369 2370 2371 /* 2372 * struct jail_attach_args { 2373 * int jid; 2374 * }; 2375 */ 2376 int 2377 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2378 { 2379 struct prison *pr; 2380 int error; 2381 2382 error = priv_check(td, PRIV_JAIL_ATTACH); 2383 if (error) 2384 return (error); 2385 2386 sx_slock(&allprison_lock); 2387 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2388 if (pr == NULL) { 2389 sx_sunlock(&allprison_lock); 2390 return (EINVAL); 2391 } 2392 2393 /* 2394 * Do not allow a process to attach to a prison that is not 2395 * considered to be "alive". 2396 */ 2397 if (pr->pr_uref == 0) { 2398 mtx_unlock(&pr->pr_mtx); 2399 sx_sunlock(&allprison_lock); 2400 return (EINVAL); 2401 } 2402 2403 return (do_jail_attach(td, pr)); 2404 } 2405 2406 static int 2407 do_jail_attach(struct thread *td, struct prison *pr) 2408 { 2409 struct prison *ppr; 2410 struct proc *p; 2411 struct ucred *newcred, *oldcred; 2412 int error; 2413 2414 /* 2415 * XXX: Note that there is a slight race here if two threads 2416 * in the same privileged process attempt to attach to two 2417 * different jails at the same time. It is important for 2418 * user processes not to do this, or they might end up with 2419 * a process root from one prison, but attached to the jail 2420 * of another. 2421 */ 2422 pr->pr_ref++; 2423 pr->pr_uref++; 2424 mtx_unlock(&pr->pr_mtx); 2425 2426 /* Let modules do whatever they need to prepare for attaching. */ 2427 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2428 if (error) { 2429 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2430 return (error); 2431 } 2432 sx_sunlock(&allprison_lock); 2433 2434 /* 2435 * Reparent the newly attached process to this jail. 2436 */ 2437 ppr = td->td_ucred->cr_prison; 2438 p = td->td_proc; 2439 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2440 if (error) 2441 goto e_revert_osd; 2442 2443 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2444 if ((error = change_dir(pr->pr_root, td)) != 0) 2445 goto e_unlock; 2446 #ifdef MAC 2447 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2448 goto e_unlock; 2449 #endif 2450 VOP_UNLOCK(pr->pr_root, 0); 2451 if ((error = change_root(pr->pr_root, td))) 2452 goto e_revert_osd; 2453 2454 newcred = crget(); 2455 PROC_LOCK(p); 2456 oldcred = p->p_ucred; 2457 setsugid(p); 2458 crcopy(newcred, oldcred); 2459 newcred->cr_prison = pr; 2460 p->p_ucred = newcred; 2461 PROC_UNLOCK(p); 2462 #ifdef RACCT 2463 racct_proc_ucred_changed(p, oldcred, newcred); 2464 #endif 2465 crfree(oldcred); 2466 prison_deref(ppr, PD_DEREF | PD_DEUREF); 2467 return (0); 2468 e_unlock: 2469 VOP_UNLOCK(pr->pr_root, 0); 2470 e_revert_osd: 2471 /* Tell modules this thread is still in its old jail after all. */ 2472 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td); 2473 prison_deref(pr, PD_DEREF | PD_DEUREF); 2474 return (error); 2475 } 2476 2477 2478 /* 2479 * Returns a locked prison instance, or NULL on failure. 2480 */ 2481 struct prison * 2482 prison_find(int prid) 2483 { 2484 struct prison *pr; 2485 2486 sx_assert(&allprison_lock, SX_LOCKED); 2487 TAILQ_FOREACH(pr, &allprison, pr_list) { 2488 if (pr->pr_id == prid) { 2489 mtx_lock(&pr->pr_mtx); 2490 if (pr->pr_ref > 0) 2491 return (pr); 2492 mtx_unlock(&pr->pr_mtx); 2493 } 2494 } 2495 return (NULL); 2496 } 2497 2498 /* 2499 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2500 */ 2501 struct prison * 2502 prison_find_child(struct prison *mypr, int prid) 2503 { 2504 struct prison *pr; 2505 int descend; 2506 2507 sx_assert(&allprison_lock, SX_LOCKED); 2508 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2509 if (pr->pr_id == prid) { 2510 mtx_lock(&pr->pr_mtx); 2511 if (pr->pr_ref > 0) 2512 return (pr); 2513 mtx_unlock(&pr->pr_mtx); 2514 } 2515 } 2516 return (NULL); 2517 } 2518 2519 /* 2520 * Look for the name relative to mypr. Returns a locked prison or NULL. 2521 */ 2522 struct prison * 2523 prison_find_name(struct prison *mypr, const char *name) 2524 { 2525 struct prison *pr, *deadpr; 2526 size_t mylen; 2527 int descend; 2528 2529 sx_assert(&allprison_lock, SX_LOCKED); 2530 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2531 again: 2532 deadpr = NULL; 2533 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2534 if (!strcmp(pr->pr_name + mylen, name)) { 2535 mtx_lock(&pr->pr_mtx); 2536 if (pr->pr_ref > 0) { 2537 if (pr->pr_uref > 0) 2538 return (pr); 2539 deadpr = pr; 2540 } 2541 mtx_unlock(&pr->pr_mtx); 2542 } 2543 } 2544 /* There was no valid prison - perhaps there was a dying one. */ 2545 if (deadpr != NULL) { 2546 mtx_lock(&deadpr->pr_mtx); 2547 if (deadpr->pr_ref == 0) { 2548 mtx_unlock(&deadpr->pr_mtx); 2549 goto again; 2550 } 2551 } 2552 return (deadpr); 2553 } 2554 2555 /* 2556 * See if a prison has the specific flag set. 2557 */ 2558 int 2559 prison_flag(struct ucred *cred, unsigned flag) 2560 { 2561 2562 /* This is an atomic read, so no locking is necessary. */ 2563 return (cred->cr_prison->pr_flags & flag); 2564 } 2565 2566 int 2567 prison_allow(struct ucred *cred, unsigned flag) 2568 { 2569 2570 /* This is an atomic read, so no locking is necessary. */ 2571 return (cred->cr_prison->pr_allow & flag); 2572 } 2573 2574 /* 2575 * Remove a prison reference. If that was the last reference, remove the 2576 * prison itself - but not in this context in case there are locks held. 2577 */ 2578 void 2579 prison_free_locked(struct prison *pr) 2580 { 2581 2582 mtx_assert(&pr->pr_mtx, MA_OWNED); 2583 pr->pr_ref--; 2584 if (pr->pr_ref == 0) { 2585 mtx_unlock(&pr->pr_mtx); 2586 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 2587 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2588 return; 2589 } 2590 mtx_unlock(&pr->pr_mtx); 2591 } 2592 2593 void 2594 prison_free(struct prison *pr) 2595 { 2596 2597 mtx_lock(&pr->pr_mtx); 2598 prison_free_locked(pr); 2599 } 2600 2601 static void 2602 prison_complete(void *context, int pending) 2603 { 2604 2605 prison_deref((struct prison *)context, 0); 2606 } 2607 2608 /* 2609 * Remove a prison reference (usually). This internal version assumes no 2610 * mutexes are held, except perhaps the prison itself. If there are no more 2611 * references, release and delist the prison. On completion, the prison lock 2612 * and the allprison lock are both unlocked. 2613 */ 2614 static void 2615 prison_deref(struct prison *pr, int flags) 2616 { 2617 struct prison *ppr, *tpr; 2618 2619 if (!(flags & PD_LOCKED)) 2620 mtx_lock(&pr->pr_mtx); 2621 for (;;) { 2622 if (flags & PD_DEUREF) { 2623 pr->pr_uref--; 2624 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2625 } 2626 if (flags & PD_DEREF) 2627 pr->pr_ref--; 2628 /* If the prison still has references, nothing else to do. */ 2629 if (pr->pr_ref > 0) { 2630 mtx_unlock(&pr->pr_mtx); 2631 if (flags & PD_LIST_SLOCKED) 2632 sx_sunlock(&allprison_lock); 2633 else if (flags & PD_LIST_XLOCKED) 2634 sx_xunlock(&allprison_lock); 2635 return; 2636 } 2637 2638 mtx_unlock(&pr->pr_mtx); 2639 if (flags & PD_LIST_SLOCKED) { 2640 if (!sx_try_upgrade(&allprison_lock)) { 2641 sx_sunlock(&allprison_lock); 2642 sx_xlock(&allprison_lock); 2643 } 2644 } else if (!(flags & PD_LIST_XLOCKED)) 2645 sx_xlock(&allprison_lock); 2646 2647 TAILQ_REMOVE(&allprison, pr, pr_list); 2648 LIST_REMOVE(pr, pr_sibling); 2649 ppr = pr->pr_parent; 2650 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2651 tpr->pr_childcount--; 2652 sx_xunlock(&allprison_lock); 2653 2654 #ifdef VIMAGE 2655 if (pr->pr_vnet != ppr->pr_vnet) 2656 vnet_destroy(pr->pr_vnet); 2657 #endif 2658 if (pr->pr_root != NULL) 2659 vrele(pr->pr_root); 2660 mtx_destroy(&pr->pr_mtx); 2661 #ifdef INET 2662 free(pr->pr_ip4, M_PRISON); 2663 #endif 2664 #ifdef INET6 2665 free(pr->pr_ip6, M_PRISON); 2666 #endif 2667 if (pr->pr_cpuset != NULL) 2668 cpuset_rel(pr->pr_cpuset); 2669 osd_jail_exit(pr); 2670 #ifdef RACCT 2671 if (racct_enable) 2672 prison_racct_detach(pr); 2673 #endif 2674 free(pr, M_PRISON); 2675 2676 /* Removing a prison frees a reference on its parent. */ 2677 pr = ppr; 2678 mtx_lock(&pr->pr_mtx); 2679 flags = PD_DEREF | PD_DEUREF; 2680 } 2681 } 2682 2683 void 2684 prison_hold_locked(struct prison *pr) 2685 { 2686 2687 mtx_assert(&pr->pr_mtx, MA_OWNED); 2688 KASSERT(pr->pr_ref > 0, 2689 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2690 pr->pr_ref++; 2691 } 2692 2693 void 2694 prison_hold(struct prison *pr) 2695 { 2696 2697 mtx_lock(&pr->pr_mtx); 2698 prison_hold_locked(pr); 2699 mtx_unlock(&pr->pr_mtx); 2700 } 2701 2702 void 2703 prison_proc_hold(struct prison *pr) 2704 { 2705 2706 mtx_lock(&pr->pr_mtx); 2707 KASSERT(pr->pr_uref > 0, 2708 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2709 pr->pr_uref++; 2710 mtx_unlock(&pr->pr_mtx); 2711 } 2712 2713 void 2714 prison_proc_free(struct prison *pr) 2715 { 2716 2717 mtx_lock(&pr->pr_mtx); 2718 KASSERT(pr->pr_uref > 0, 2719 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2720 prison_deref(pr, PD_DEUREF | PD_LOCKED); 2721 } 2722 2723 2724 #ifdef INET 2725 /* 2726 * Restrict a prison's IP address list with its parent's, possibly replacing 2727 * it. Return true if the replacement buffer was used (or would have been). 2728 */ 2729 static int 2730 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2731 { 2732 int ii, ij, used; 2733 struct prison *ppr; 2734 2735 ppr = pr->pr_parent; 2736 if (!(pr->pr_flags & PR_IP4_USER)) { 2737 /* This has no user settings, so just copy the parent's list. */ 2738 if (pr->pr_ip4s < ppr->pr_ip4s) { 2739 /* 2740 * There's no room for the parent's list. Use the 2741 * new list buffer, which is assumed to be big enough 2742 * (if it was passed). If there's no buffer, try to 2743 * allocate one. 2744 */ 2745 used = 1; 2746 if (newip4 == NULL) { 2747 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2748 M_PRISON, M_NOWAIT); 2749 if (newip4 != NULL) 2750 used = 0; 2751 } 2752 if (newip4 != NULL) { 2753 bcopy(ppr->pr_ip4, newip4, 2754 ppr->pr_ip4s * sizeof(*newip4)); 2755 free(pr->pr_ip4, M_PRISON); 2756 pr->pr_ip4 = newip4; 2757 pr->pr_ip4s = ppr->pr_ip4s; 2758 } 2759 return (used); 2760 } 2761 pr->pr_ip4s = ppr->pr_ip4s; 2762 if (pr->pr_ip4s > 0) 2763 bcopy(ppr->pr_ip4, pr->pr_ip4, 2764 pr->pr_ip4s * sizeof(*newip4)); 2765 else if (pr->pr_ip4 != NULL) { 2766 free(pr->pr_ip4, M_PRISON); 2767 pr->pr_ip4 = NULL; 2768 } 2769 } else if (pr->pr_ip4s > 0) { 2770 /* Remove addresses that aren't in the parent. */ 2771 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2772 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2773 break; 2774 if (ij < ppr->pr_ip4s) 2775 ii = 1; 2776 else { 2777 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2778 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2779 ii = 0; 2780 } 2781 for (ij = 1; ii < pr->pr_ip4s; ) { 2782 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2783 ii++; 2784 continue; 2785 } 2786 switch (ij >= ppr->pr_ip4s ? -1 : 2787 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2788 case -1: 2789 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2790 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2791 break; 2792 case 0: 2793 ii++; 2794 ij++; 2795 break; 2796 case 1: 2797 ij++; 2798 break; 2799 } 2800 } 2801 if (pr->pr_ip4s == 0) { 2802 pr->pr_flags |= PR_IP4_DISABLE; 2803 free(pr->pr_ip4, M_PRISON); 2804 pr->pr_ip4 = NULL; 2805 } 2806 } 2807 return (0); 2808 } 2809 2810 /* 2811 * Pass back primary IPv4 address of this jail. 2812 * 2813 * If not restricted return success but do not alter the address. Caller has 2814 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2815 * 2816 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2817 * Address returned in NBO. 2818 */ 2819 int 2820 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2821 { 2822 struct prison *pr; 2823 2824 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2825 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2826 2827 pr = cred->cr_prison; 2828 if (!(pr->pr_flags & PR_IP4)) 2829 return (0); 2830 mtx_lock(&pr->pr_mtx); 2831 if (!(pr->pr_flags & PR_IP4)) { 2832 mtx_unlock(&pr->pr_mtx); 2833 return (0); 2834 } 2835 if (pr->pr_ip4 == NULL) { 2836 mtx_unlock(&pr->pr_mtx); 2837 return (EAFNOSUPPORT); 2838 } 2839 2840 ia->s_addr = pr->pr_ip4[0].s_addr; 2841 mtx_unlock(&pr->pr_mtx); 2842 return (0); 2843 } 2844 2845 /* 2846 * Return 1 if we should do proper source address selection or are not jailed. 2847 * We will return 0 if we should bypass source address selection in favour 2848 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2849 * returned in NBO. 2850 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2851 */ 2852 int 2853 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2854 { 2855 struct prison *pr; 2856 struct in_addr lia; 2857 int error; 2858 2859 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2860 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2861 2862 if (!jailed(cred)) 2863 return (1); 2864 2865 pr = cred->cr_prison; 2866 if (pr->pr_flags & PR_IP4_SADDRSEL) 2867 return (1); 2868 2869 lia.s_addr = INADDR_ANY; 2870 error = prison_get_ip4(cred, &lia); 2871 if (error) 2872 return (error); 2873 if (lia.s_addr == INADDR_ANY) 2874 return (1); 2875 2876 ia->s_addr = lia.s_addr; 2877 return (0); 2878 } 2879 2880 /* 2881 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2882 */ 2883 int 2884 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2885 { 2886 2887 if (pr1 == pr2) 2888 return (1); 2889 2890 /* 2891 * No need to lock since the PR_IP4_USER flag can't be altered for 2892 * existing prisons. 2893 */ 2894 while (pr1 != &prison0 && 2895 #ifdef VIMAGE 2896 !(pr1->pr_flags & PR_VNET) && 2897 #endif 2898 !(pr1->pr_flags & PR_IP4_USER)) 2899 pr1 = pr1->pr_parent; 2900 while (pr2 != &prison0 && 2901 #ifdef VIMAGE 2902 !(pr2->pr_flags & PR_VNET) && 2903 #endif 2904 !(pr2->pr_flags & PR_IP4_USER)) 2905 pr2 = pr2->pr_parent; 2906 return (pr1 == pr2); 2907 } 2908 2909 /* 2910 * Make sure our (source) address is set to something meaningful to this 2911 * jail. 2912 * 2913 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2914 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2915 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2916 */ 2917 int 2918 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2919 { 2920 struct prison *pr; 2921 struct in_addr ia0; 2922 int error; 2923 2924 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2925 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2926 2927 pr = cred->cr_prison; 2928 if (!(pr->pr_flags & PR_IP4)) 2929 return (0); 2930 mtx_lock(&pr->pr_mtx); 2931 if (!(pr->pr_flags & PR_IP4)) { 2932 mtx_unlock(&pr->pr_mtx); 2933 return (0); 2934 } 2935 if (pr->pr_ip4 == NULL) { 2936 mtx_unlock(&pr->pr_mtx); 2937 return (EAFNOSUPPORT); 2938 } 2939 2940 ia0.s_addr = ntohl(ia->s_addr); 2941 if (ia0.s_addr == INADDR_LOOPBACK) { 2942 ia->s_addr = pr->pr_ip4[0].s_addr; 2943 mtx_unlock(&pr->pr_mtx); 2944 return (0); 2945 } 2946 2947 if (ia0.s_addr == INADDR_ANY) { 2948 /* 2949 * In case there is only 1 IPv4 address, bind directly. 2950 */ 2951 if (pr->pr_ip4s == 1) 2952 ia->s_addr = pr->pr_ip4[0].s_addr; 2953 mtx_unlock(&pr->pr_mtx); 2954 return (0); 2955 } 2956 2957 error = _prison_check_ip4(pr, ia); 2958 mtx_unlock(&pr->pr_mtx); 2959 return (error); 2960 } 2961 2962 /* 2963 * Rewrite destination address in case we will connect to loopback address. 2964 * 2965 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2966 * Address passed in in NBO and returned in NBO. 2967 */ 2968 int 2969 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 2970 { 2971 struct prison *pr; 2972 2973 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2974 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2975 2976 pr = cred->cr_prison; 2977 if (!(pr->pr_flags & PR_IP4)) 2978 return (0); 2979 mtx_lock(&pr->pr_mtx); 2980 if (!(pr->pr_flags & PR_IP4)) { 2981 mtx_unlock(&pr->pr_mtx); 2982 return (0); 2983 } 2984 if (pr->pr_ip4 == NULL) { 2985 mtx_unlock(&pr->pr_mtx); 2986 return (EAFNOSUPPORT); 2987 } 2988 2989 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 2990 ia->s_addr = pr->pr_ip4[0].s_addr; 2991 mtx_unlock(&pr->pr_mtx); 2992 return (0); 2993 } 2994 2995 /* 2996 * Return success because nothing had to be changed. 2997 */ 2998 mtx_unlock(&pr->pr_mtx); 2999 return (0); 3000 } 3001 3002 /* 3003 * Check if given address belongs to the jail referenced by cred/prison. 3004 * 3005 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 3006 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3007 * doesn't allow IPv4. Address passed in in NBO. 3008 */ 3009 static int 3010 _prison_check_ip4(struct prison *pr, struct in_addr *ia) 3011 { 3012 int i, a, z, d; 3013 3014 /* 3015 * Check the primary IP. 3016 */ 3017 if (pr->pr_ip4[0].s_addr == ia->s_addr) 3018 return (0); 3019 3020 /* 3021 * All the other IPs are sorted so we can do a binary search. 3022 */ 3023 a = 0; 3024 z = pr->pr_ip4s - 2; 3025 while (a <= z) { 3026 i = (a + z) / 2; 3027 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 3028 if (d > 0) 3029 z = i - 1; 3030 else if (d < 0) 3031 a = i + 1; 3032 else 3033 return (0); 3034 } 3035 3036 return (EADDRNOTAVAIL); 3037 } 3038 3039 int 3040 prison_check_ip4(struct ucred *cred, struct in_addr *ia) 3041 { 3042 struct prison *pr; 3043 int error; 3044 3045 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3046 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 3047 3048 pr = cred->cr_prison; 3049 if (!(pr->pr_flags & PR_IP4)) 3050 return (0); 3051 mtx_lock(&pr->pr_mtx); 3052 if (!(pr->pr_flags & PR_IP4)) { 3053 mtx_unlock(&pr->pr_mtx); 3054 return (0); 3055 } 3056 if (pr->pr_ip4 == NULL) { 3057 mtx_unlock(&pr->pr_mtx); 3058 return (EAFNOSUPPORT); 3059 } 3060 3061 error = _prison_check_ip4(pr, ia); 3062 mtx_unlock(&pr->pr_mtx); 3063 return (error); 3064 } 3065 #endif 3066 3067 #ifdef INET6 3068 static int 3069 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 3070 { 3071 int ii, ij, used; 3072 struct prison *ppr; 3073 3074 ppr = pr->pr_parent; 3075 if (!(pr->pr_flags & PR_IP6_USER)) { 3076 /* This has no user settings, so just copy the parent's list. */ 3077 if (pr->pr_ip6s < ppr->pr_ip6s) { 3078 /* 3079 * There's no room for the parent's list. Use the 3080 * new list buffer, which is assumed to be big enough 3081 * (if it was passed). If there's no buffer, try to 3082 * allocate one. 3083 */ 3084 used = 1; 3085 if (newip6 == NULL) { 3086 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 3087 M_PRISON, M_NOWAIT); 3088 if (newip6 != NULL) 3089 used = 0; 3090 } 3091 if (newip6 != NULL) { 3092 bcopy(ppr->pr_ip6, newip6, 3093 ppr->pr_ip6s * sizeof(*newip6)); 3094 free(pr->pr_ip6, M_PRISON); 3095 pr->pr_ip6 = newip6; 3096 pr->pr_ip6s = ppr->pr_ip6s; 3097 } 3098 return (used); 3099 } 3100 pr->pr_ip6s = ppr->pr_ip6s; 3101 if (pr->pr_ip6s > 0) 3102 bcopy(ppr->pr_ip6, pr->pr_ip6, 3103 pr->pr_ip6s * sizeof(*newip6)); 3104 else if (pr->pr_ip6 != NULL) { 3105 free(pr->pr_ip6, M_PRISON); 3106 pr->pr_ip6 = NULL; 3107 } 3108 } else if (pr->pr_ip6s > 0) { 3109 /* Remove addresses that aren't in the parent. */ 3110 for (ij = 0; ij < ppr->pr_ip6s; ij++) 3111 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 3112 &ppr->pr_ip6[ij])) 3113 break; 3114 if (ij < ppr->pr_ip6s) 3115 ii = 1; 3116 else { 3117 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 3118 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 3119 ii = 0; 3120 } 3121 for (ij = 1; ii < pr->pr_ip6s; ) { 3122 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 3123 &ppr->pr_ip6[0])) { 3124 ii++; 3125 continue; 3126 } 3127 switch (ij >= ppr->pr_ip6s ? -1 : 3128 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 3129 case -1: 3130 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 3131 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 3132 break; 3133 case 0: 3134 ii++; 3135 ij++; 3136 break; 3137 case 1: 3138 ij++; 3139 break; 3140 } 3141 } 3142 if (pr->pr_ip6s == 0) { 3143 pr->pr_flags |= PR_IP6_DISABLE; 3144 free(pr->pr_ip6, M_PRISON); 3145 pr->pr_ip6 = NULL; 3146 } 3147 } 3148 return 0; 3149 } 3150 3151 /* 3152 * Pass back primary IPv6 address for this jail. 3153 * 3154 * If not restricted return success but do not alter the address. Caller has 3155 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3156 * 3157 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3158 */ 3159 int 3160 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3161 { 3162 struct prison *pr; 3163 3164 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3165 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3166 3167 pr = cred->cr_prison; 3168 if (!(pr->pr_flags & PR_IP6)) 3169 return (0); 3170 mtx_lock(&pr->pr_mtx); 3171 if (!(pr->pr_flags & PR_IP6)) { 3172 mtx_unlock(&pr->pr_mtx); 3173 return (0); 3174 } 3175 if (pr->pr_ip6 == NULL) { 3176 mtx_unlock(&pr->pr_mtx); 3177 return (EAFNOSUPPORT); 3178 } 3179 3180 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3181 mtx_unlock(&pr->pr_mtx); 3182 return (0); 3183 } 3184 3185 /* 3186 * Return 1 if we should do proper source address selection or are not jailed. 3187 * We will return 0 if we should bypass source address selection in favour 3188 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3189 * returned in NBO. 3190 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3191 */ 3192 int 3193 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3194 { 3195 struct prison *pr; 3196 struct in6_addr lia6; 3197 int error; 3198 3199 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3200 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3201 3202 if (!jailed(cred)) 3203 return (1); 3204 3205 pr = cred->cr_prison; 3206 if (pr->pr_flags & PR_IP6_SADDRSEL) 3207 return (1); 3208 3209 lia6 = in6addr_any; 3210 error = prison_get_ip6(cred, &lia6); 3211 if (error) 3212 return (error); 3213 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3214 return (1); 3215 3216 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3217 return (0); 3218 } 3219 3220 /* 3221 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3222 */ 3223 int 3224 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3225 { 3226 3227 if (pr1 == pr2) 3228 return (1); 3229 3230 while (pr1 != &prison0 && 3231 #ifdef VIMAGE 3232 !(pr1->pr_flags & PR_VNET) && 3233 #endif 3234 !(pr1->pr_flags & PR_IP6_USER)) 3235 pr1 = pr1->pr_parent; 3236 while (pr2 != &prison0 && 3237 #ifdef VIMAGE 3238 !(pr2->pr_flags & PR_VNET) && 3239 #endif 3240 !(pr2->pr_flags & PR_IP6_USER)) 3241 pr2 = pr2->pr_parent; 3242 return (pr1 == pr2); 3243 } 3244 3245 /* 3246 * Make sure our (source) address is set to something meaningful to this jail. 3247 * 3248 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3249 * when needed while binding. 3250 * 3251 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3252 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3253 * doesn't allow IPv6. 3254 */ 3255 int 3256 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3257 { 3258 struct prison *pr; 3259 int error; 3260 3261 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3262 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3263 3264 pr = cred->cr_prison; 3265 if (!(pr->pr_flags & PR_IP6)) 3266 return (0); 3267 mtx_lock(&pr->pr_mtx); 3268 if (!(pr->pr_flags & PR_IP6)) { 3269 mtx_unlock(&pr->pr_mtx); 3270 return (0); 3271 } 3272 if (pr->pr_ip6 == NULL) { 3273 mtx_unlock(&pr->pr_mtx); 3274 return (EAFNOSUPPORT); 3275 } 3276 3277 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3278 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3279 mtx_unlock(&pr->pr_mtx); 3280 return (0); 3281 } 3282 3283 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3284 /* 3285 * In case there is only 1 IPv6 address, and v6only is true, 3286 * then bind directly. 3287 */ 3288 if (v6only != 0 && pr->pr_ip6s == 1) 3289 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3290 mtx_unlock(&pr->pr_mtx); 3291 return (0); 3292 } 3293 3294 error = _prison_check_ip6(pr, ia6); 3295 mtx_unlock(&pr->pr_mtx); 3296 return (error); 3297 } 3298 3299 /* 3300 * Rewrite destination address in case we will connect to loopback address. 3301 * 3302 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3303 */ 3304 int 3305 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3306 { 3307 struct prison *pr; 3308 3309 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3310 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3311 3312 pr = cred->cr_prison; 3313 if (!(pr->pr_flags & PR_IP6)) 3314 return (0); 3315 mtx_lock(&pr->pr_mtx); 3316 if (!(pr->pr_flags & PR_IP6)) { 3317 mtx_unlock(&pr->pr_mtx); 3318 return (0); 3319 } 3320 if (pr->pr_ip6 == NULL) { 3321 mtx_unlock(&pr->pr_mtx); 3322 return (EAFNOSUPPORT); 3323 } 3324 3325 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3326 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3327 mtx_unlock(&pr->pr_mtx); 3328 return (0); 3329 } 3330 3331 /* 3332 * Return success because nothing had to be changed. 3333 */ 3334 mtx_unlock(&pr->pr_mtx); 3335 return (0); 3336 } 3337 3338 /* 3339 * Check if given address belongs to the jail referenced by cred/prison. 3340 * 3341 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3342 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3343 * doesn't allow IPv6. 3344 */ 3345 static int 3346 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3347 { 3348 int i, a, z, d; 3349 3350 /* 3351 * Check the primary IP. 3352 */ 3353 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3354 return (0); 3355 3356 /* 3357 * All the other IPs are sorted so we can do a binary search. 3358 */ 3359 a = 0; 3360 z = pr->pr_ip6s - 2; 3361 while (a <= z) { 3362 i = (a + z) / 2; 3363 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3364 if (d > 0) 3365 z = i - 1; 3366 else if (d < 0) 3367 a = i + 1; 3368 else 3369 return (0); 3370 } 3371 3372 return (EADDRNOTAVAIL); 3373 } 3374 3375 int 3376 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3377 { 3378 struct prison *pr; 3379 int error; 3380 3381 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3382 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3383 3384 pr = cred->cr_prison; 3385 if (!(pr->pr_flags & PR_IP6)) 3386 return (0); 3387 mtx_lock(&pr->pr_mtx); 3388 if (!(pr->pr_flags & PR_IP6)) { 3389 mtx_unlock(&pr->pr_mtx); 3390 return (0); 3391 } 3392 if (pr->pr_ip6 == NULL) { 3393 mtx_unlock(&pr->pr_mtx); 3394 return (EAFNOSUPPORT); 3395 } 3396 3397 error = _prison_check_ip6(pr, ia6); 3398 mtx_unlock(&pr->pr_mtx); 3399 return (error); 3400 } 3401 #endif 3402 3403 /* 3404 * Check if a jail supports the given address family. 3405 * 3406 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3407 * if not. 3408 */ 3409 int 3410 prison_check_af(struct ucred *cred, int af) 3411 { 3412 struct prison *pr; 3413 int error; 3414 3415 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3416 3417 pr = cred->cr_prison; 3418 #ifdef VIMAGE 3419 /* Prisons with their own network stack are not limited. */ 3420 if (prison_owns_vnet(cred)) 3421 return (0); 3422 #endif 3423 3424 error = 0; 3425 switch (af) 3426 { 3427 #ifdef INET 3428 case AF_INET: 3429 if (pr->pr_flags & PR_IP4) 3430 { 3431 mtx_lock(&pr->pr_mtx); 3432 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3433 error = EAFNOSUPPORT; 3434 mtx_unlock(&pr->pr_mtx); 3435 } 3436 break; 3437 #endif 3438 #ifdef INET6 3439 case AF_INET6: 3440 if (pr->pr_flags & PR_IP6) 3441 { 3442 mtx_lock(&pr->pr_mtx); 3443 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3444 error = EAFNOSUPPORT; 3445 mtx_unlock(&pr->pr_mtx); 3446 } 3447 break; 3448 #endif 3449 case AF_LOCAL: 3450 case AF_ROUTE: 3451 break; 3452 default: 3453 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3454 error = EAFNOSUPPORT; 3455 } 3456 return (error); 3457 } 3458 3459 /* 3460 * Check if given address belongs to the jail referenced by cred (wrapper to 3461 * prison_check_ip[46]). 3462 * 3463 * Returns 0 if jail doesn't restrict the address family or if address belongs 3464 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3465 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3466 */ 3467 int 3468 prison_if(struct ucred *cred, struct sockaddr *sa) 3469 { 3470 #ifdef INET 3471 struct sockaddr_in *sai; 3472 #endif 3473 #ifdef INET6 3474 struct sockaddr_in6 *sai6; 3475 #endif 3476 int error; 3477 3478 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3479 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3480 3481 #ifdef VIMAGE 3482 if (prison_owns_vnet(cred)) 3483 return (0); 3484 #endif 3485 3486 error = 0; 3487 switch (sa->sa_family) 3488 { 3489 #ifdef INET 3490 case AF_INET: 3491 sai = (struct sockaddr_in *)sa; 3492 error = prison_check_ip4(cred, &sai->sin_addr); 3493 break; 3494 #endif 3495 #ifdef INET6 3496 case AF_INET6: 3497 sai6 = (struct sockaddr_in6 *)sa; 3498 error = prison_check_ip6(cred, &sai6->sin6_addr); 3499 break; 3500 #endif 3501 default: 3502 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3503 error = EAFNOSUPPORT; 3504 } 3505 return (error); 3506 } 3507 3508 /* 3509 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3510 */ 3511 int 3512 prison_check(struct ucred *cred1, struct ucred *cred2) 3513 { 3514 3515 return ((cred1->cr_prison == cred2->cr_prison || 3516 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3517 } 3518 3519 /* 3520 * Return 1 if p2 is a child of p1, otherwise 0. 3521 */ 3522 int 3523 prison_ischild(struct prison *pr1, struct prison *pr2) 3524 { 3525 3526 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3527 if (pr1 == pr2) 3528 return (1); 3529 return (0); 3530 } 3531 3532 /* 3533 * Return 1 if the passed credential is in a jail, otherwise 0. 3534 */ 3535 int 3536 jailed(struct ucred *cred) 3537 { 3538 3539 return (cred->cr_prison != &prison0); 3540 } 3541 3542 /* 3543 * Return 1 if the passed credential is in a jail and that jail does not 3544 * have its own virtual network stack, otherwise 0. 3545 */ 3546 int 3547 jailed_without_vnet(struct ucred *cred) 3548 { 3549 3550 if (!jailed(cred)) 3551 return (0); 3552 #ifdef VIMAGE 3553 if (prison_owns_vnet(cred)) 3554 return (0); 3555 #endif 3556 3557 return (1); 3558 } 3559 3560 /* 3561 * Return the correct hostname (domainname, et al) for the passed credential. 3562 */ 3563 void 3564 getcredhostname(struct ucred *cred, char *buf, size_t size) 3565 { 3566 struct prison *pr; 3567 3568 /* 3569 * A NULL credential can be used to shortcut to the physical 3570 * system's hostname. 3571 */ 3572 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3573 mtx_lock(&pr->pr_mtx); 3574 strlcpy(buf, pr->pr_hostname, size); 3575 mtx_unlock(&pr->pr_mtx); 3576 } 3577 3578 void 3579 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3580 { 3581 3582 mtx_lock(&cred->cr_prison->pr_mtx); 3583 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3584 mtx_unlock(&cred->cr_prison->pr_mtx); 3585 } 3586 3587 void 3588 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3589 { 3590 3591 mtx_lock(&cred->cr_prison->pr_mtx); 3592 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3593 mtx_unlock(&cred->cr_prison->pr_mtx); 3594 } 3595 3596 void 3597 getcredhostid(struct ucred *cred, unsigned long *hostid) 3598 { 3599 3600 mtx_lock(&cred->cr_prison->pr_mtx); 3601 *hostid = cred->cr_prison->pr_hostid; 3602 mtx_unlock(&cred->cr_prison->pr_mtx); 3603 } 3604 3605 #ifdef VIMAGE 3606 /* 3607 * Determine whether the prison represented by cred owns 3608 * its vnet rather than having it inherited. 3609 * 3610 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3611 */ 3612 int 3613 prison_owns_vnet(struct ucred *cred) 3614 { 3615 3616 /* 3617 * vnets cannot be added/removed after jail creation, 3618 * so no need to lock here. 3619 */ 3620 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3621 } 3622 #endif 3623 3624 /* 3625 * Determine whether the subject represented by cred can "see" 3626 * status of a mount point. 3627 * Returns: 0 for permitted, ENOENT otherwise. 3628 * XXX: This function should be called cr_canseemount() and should be 3629 * placed in kern_prot.c. 3630 */ 3631 int 3632 prison_canseemount(struct ucred *cred, struct mount *mp) 3633 { 3634 struct prison *pr; 3635 struct statfs *sp; 3636 size_t len; 3637 3638 pr = cred->cr_prison; 3639 if (pr->pr_enforce_statfs == 0) 3640 return (0); 3641 if (pr->pr_root->v_mount == mp) 3642 return (0); 3643 if (pr->pr_enforce_statfs == 2) 3644 return (ENOENT); 3645 /* 3646 * If jail's chroot directory is set to "/" we should be able to see 3647 * all mount-points from inside a jail. 3648 * This is ugly check, but this is the only situation when jail's 3649 * directory ends with '/'. 3650 */ 3651 if (strcmp(pr->pr_path, "/") == 0) 3652 return (0); 3653 len = strlen(pr->pr_path); 3654 sp = &mp->mnt_stat; 3655 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3656 return (ENOENT); 3657 /* 3658 * Be sure that we don't have situation where jail's root directory 3659 * is "/some/path" and mount point is "/some/pathpath". 3660 */ 3661 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3662 return (ENOENT); 3663 return (0); 3664 } 3665 3666 void 3667 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3668 { 3669 char jpath[MAXPATHLEN]; 3670 struct prison *pr; 3671 size_t len; 3672 3673 pr = cred->cr_prison; 3674 if (pr->pr_enforce_statfs == 0) 3675 return; 3676 if (prison_canseemount(cred, mp) != 0) { 3677 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3678 strlcpy(sp->f_mntonname, "[restricted]", 3679 sizeof(sp->f_mntonname)); 3680 return; 3681 } 3682 if (pr->pr_root->v_mount == mp) { 3683 /* 3684 * Clear current buffer data, so we are sure nothing from 3685 * the valid path left there. 3686 */ 3687 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3688 *sp->f_mntonname = '/'; 3689 return; 3690 } 3691 /* 3692 * If jail's chroot directory is set to "/" we should be able to see 3693 * all mount-points from inside a jail. 3694 */ 3695 if (strcmp(pr->pr_path, "/") == 0) 3696 return; 3697 len = strlen(pr->pr_path); 3698 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3699 /* 3700 * Clear current buffer data, so we are sure nothing from 3701 * the valid path left there. 3702 */ 3703 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3704 if (*jpath == '\0') { 3705 /* Should never happen. */ 3706 *sp->f_mntonname = '/'; 3707 } else { 3708 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3709 } 3710 } 3711 3712 /* 3713 * Check with permission for a specific privilege is granted within jail. We 3714 * have a specific list of accepted privileges; the rest are denied. 3715 */ 3716 int 3717 prison_priv_check(struct ucred *cred, int priv) 3718 { 3719 3720 if (!jailed(cred)) 3721 return (0); 3722 3723 #ifdef VIMAGE 3724 /* 3725 * Privileges specific to prisons with a virtual network stack. 3726 * There might be a duplicate entry here in case the privilege 3727 * is only granted conditionally in the legacy jail case. 3728 */ 3729 switch (priv) { 3730 #ifdef notyet 3731 /* 3732 * NFS-specific privileges. 3733 */ 3734 case PRIV_NFS_DAEMON: 3735 case PRIV_NFS_LOCKD: 3736 #endif 3737 /* 3738 * Network stack privileges. 3739 */ 3740 case PRIV_NET_BRIDGE: 3741 case PRIV_NET_GRE: 3742 case PRIV_NET_BPF: 3743 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3744 case PRIV_NET_ROUTE: 3745 case PRIV_NET_TAP: 3746 case PRIV_NET_SETIFMTU: 3747 case PRIV_NET_SETIFFLAGS: 3748 case PRIV_NET_SETIFCAP: 3749 case PRIV_NET_SETIFDESCR: 3750 case PRIV_NET_SETIFNAME : 3751 case PRIV_NET_SETIFMETRIC: 3752 case PRIV_NET_SETIFPHYS: 3753 case PRIV_NET_SETIFMAC: 3754 case PRIV_NET_ADDMULTI: 3755 case PRIV_NET_DELMULTI: 3756 case PRIV_NET_HWIOCTL: 3757 case PRIV_NET_SETLLADDR: 3758 case PRIV_NET_ADDIFGROUP: 3759 case PRIV_NET_DELIFGROUP: 3760 case PRIV_NET_IFCREATE: 3761 case PRIV_NET_IFDESTROY: 3762 case PRIV_NET_ADDIFADDR: 3763 case PRIV_NET_DELIFADDR: 3764 case PRIV_NET_LAGG: 3765 case PRIV_NET_GIF: 3766 case PRIV_NET_SETIFVNET: 3767 case PRIV_NET_SETIFFIB: 3768 3769 /* 3770 * 802.11-related privileges. 3771 */ 3772 case PRIV_NET80211_GETKEY: 3773 #ifdef notyet 3774 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3775 #endif 3776 3777 #ifdef notyet 3778 /* 3779 * AppleTalk privileges. 3780 */ 3781 case PRIV_NETATALK_RESERVEDPORT: 3782 3783 /* 3784 * ATM privileges. 3785 */ 3786 case PRIV_NETATM_CFG: 3787 case PRIV_NETATM_ADD: 3788 case PRIV_NETATM_DEL: 3789 case PRIV_NETATM_SET: 3790 3791 /* 3792 * Bluetooth privileges. 3793 */ 3794 case PRIV_NETBLUETOOTH_RAW: 3795 #endif 3796 3797 /* 3798 * Netgraph and netgraph module privileges. 3799 */ 3800 case PRIV_NETGRAPH_CONTROL: 3801 #ifdef notyet 3802 case PRIV_NETGRAPH_TTY: 3803 #endif 3804 3805 /* 3806 * IPv4 and IPv6 privileges. 3807 */ 3808 case PRIV_NETINET_IPFW: 3809 case PRIV_NETINET_DIVERT: 3810 case PRIV_NETINET_PF: 3811 case PRIV_NETINET_DUMMYNET: 3812 case PRIV_NETINET_CARP: 3813 case PRIV_NETINET_MROUTE: 3814 case PRIV_NETINET_RAW: 3815 case PRIV_NETINET_ADDRCTRL6: 3816 case PRIV_NETINET_ND6: 3817 case PRIV_NETINET_SCOPE6: 3818 case PRIV_NETINET_ALIFETIME6: 3819 case PRIV_NETINET_IPSEC: 3820 case PRIV_NETINET_BINDANY: 3821 3822 #ifdef notyet 3823 /* 3824 * IPX/SPX privileges. 3825 */ 3826 case PRIV_NETIPX_RESERVEDPORT: 3827 case PRIV_NETIPX_RAW: 3828 3829 /* 3830 * NCP privileges. 3831 */ 3832 case PRIV_NETNCP: 3833 3834 /* 3835 * SMB privileges. 3836 */ 3837 case PRIV_NETSMB: 3838 #endif 3839 3840 /* 3841 * No default: or deny here. 3842 * In case of no permit fall through to next switch(). 3843 */ 3844 if (cred->cr_prison->pr_flags & PR_VNET) 3845 return (0); 3846 } 3847 #endif /* VIMAGE */ 3848 3849 switch (priv) { 3850 3851 /* 3852 * Allow ktrace privileges for root in jail. 3853 */ 3854 case PRIV_KTRACE: 3855 3856 #if 0 3857 /* 3858 * Allow jailed processes to configure audit identity and 3859 * submit audit records (login, etc). In the future we may 3860 * want to further refine the relationship between audit and 3861 * jail. 3862 */ 3863 case PRIV_AUDIT_GETAUDIT: 3864 case PRIV_AUDIT_SETAUDIT: 3865 case PRIV_AUDIT_SUBMIT: 3866 #endif 3867 3868 /* 3869 * Allow jailed processes to manipulate process UNIX 3870 * credentials in any way they see fit. 3871 */ 3872 case PRIV_CRED_SETUID: 3873 case PRIV_CRED_SETEUID: 3874 case PRIV_CRED_SETGID: 3875 case PRIV_CRED_SETEGID: 3876 case PRIV_CRED_SETGROUPS: 3877 case PRIV_CRED_SETREUID: 3878 case PRIV_CRED_SETREGID: 3879 case PRIV_CRED_SETRESUID: 3880 case PRIV_CRED_SETRESGID: 3881 3882 /* 3883 * Jail implements visibility constraints already, so allow 3884 * jailed root to override uid/gid-based constraints. 3885 */ 3886 case PRIV_SEEOTHERGIDS: 3887 case PRIV_SEEOTHERUIDS: 3888 3889 /* 3890 * Jail implements inter-process debugging limits already, so 3891 * allow jailed root various debugging privileges. 3892 */ 3893 case PRIV_DEBUG_DIFFCRED: 3894 case PRIV_DEBUG_SUGID: 3895 case PRIV_DEBUG_UNPRIV: 3896 3897 /* 3898 * Allow jail to set various resource limits and login 3899 * properties, and for now, exceed process resource limits. 3900 */ 3901 case PRIV_PROC_LIMIT: 3902 case PRIV_PROC_SETLOGIN: 3903 case PRIV_PROC_SETRLIMIT: 3904 3905 /* 3906 * System V and POSIX IPC privileges are granted in jail. 3907 */ 3908 case PRIV_IPC_READ: 3909 case PRIV_IPC_WRITE: 3910 case PRIV_IPC_ADMIN: 3911 case PRIV_IPC_MSGSIZE: 3912 case PRIV_MQ_ADMIN: 3913 3914 /* 3915 * Jail operations within a jail work on child jails. 3916 */ 3917 case PRIV_JAIL_ATTACH: 3918 case PRIV_JAIL_SET: 3919 case PRIV_JAIL_REMOVE: 3920 3921 /* 3922 * Jail implements its own inter-process limits, so allow 3923 * root processes in jail to change scheduling on other 3924 * processes in the same jail. Likewise for signalling. 3925 */ 3926 case PRIV_SCHED_DIFFCRED: 3927 case PRIV_SCHED_CPUSET: 3928 case PRIV_SIGNAL_DIFFCRED: 3929 case PRIV_SIGNAL_SUGID: 3930 3931 /* 3932 * Allow jailed processes to write to sysctls marked as jail 3933 * writable. 3934 */ 3935 case PRIV_SYSCTL_WRITEJAIL: 3936 3937 /* 3938 * Allow root in jail to manage a variety of quota 3939 * properties. These should likely be conditional on a 3940 * configuration option. 3941 */ 3942 case PRIV_VFS_GETQUOTA: 3943 case PRIV_VFS_SETQUOTA: 3944 3945 /* 3946 * Since Jail relies on chroot() to implement file system 3947 * protections, grant many VFS privileges to root in jail. 3948 * Be careful to exclude mount-related and NFS-related 3949 * privileges. 3950 */ 3951 case PRIV_VFS_READ: 3952 case PRIV_VFS_WRITE: 3953 case PRIV_VFS_ADMIN: 3954 case PRIV_VFS_EXEC: 3955 case PRIV_VFS_LOOKUP: 3956 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3957 case PRIV_VFS_CHFLAGS_DEV: 3958 case PRIV_VFS_CHOWN: 3959 case PRIV_VFS_CHROOT: 3960 case PRIV_VFS_RETAINSUGID: 3961 case PRIV_VFS_FCHROOT: 3962 case PRIV_VFS_LINK: 3963 case PRIV_VFS_SETGID: 3964 case PRIV_VFS_STAT: 3965 case PRIV_VFS_STICKYFILE: 3966 3967 /* 3968 * As in the non-jail case, non-root users are expected to be 3969 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3970 * exists in the jail and they have permission to access it). 3971 */ 3972 case PRIV_KMEM_READ: 3973 return (0); 3974 3975 /* 3976 * Depending on the global setting, allow privilege of 3977 * setting system flags. 3978 */ 3979 case PRIV_VFS_SYSFLAGS: 3980 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3981 return (0); 3982 else 3983 return (EPERM); 3984 3985 /* 3986 * Depending on the global setting, allow privilege of 3987 * mounting/unmounting file systems. 3988 */ 3989 case PRIV_VFS_MOUNT: 3990 case PRIV_VFS_UNMOUNT: 3991 case PRIV_VFS_MOUNT_NONUSER: 3992 case PRIV_VFS_MOUNT_OWNER: 3993 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3994 cred->cr_prison->pr_enforce_statfs < 2) 3995 return (0); 3996 else 3997 return (EPERM); 3998 3999 /* 4000 * Allow jailed root to bind reserved ports and reuse in-use 4001 * ports. 4002 */ 4003 case PRIV_NETINET_RESERVEDPORT: 4004 case PRIV_NETINET_REUSEPORT: 4005 return (0); 4006 4007 /* 4008 * Allow jailed root to set certian IPv4/6 (option) headers. 4009 */ 4010 case PRIV_NETINET_SETHDROPTS: 4011 return (0); 4012 4013 /* 4014 * Conditionally allow creating raw sockets in jail. 4015 */ 4016 case PRIV_NETINET_RAW: 4017 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 4018 return (0); 4019 else 4020 return (EPERM); 4021 4022 /* 4023 * Since jail implements its own visibility limits on netstat 4024 * sysctls, allow getcred. This allows identd to work in 4025 * jail. 4026 */ 4027 case PRIV_NETINET_GETCRED: 4028 return (0); 4029 4030 /* 4031 * Allow jailed root to set loginclass. 4032 */ 4033 case PRIV_PROC_SETLOGINCLASS: 4034 return (0); 4035 4036 default: 4037 /* 4038 * In all remaining cases, deny the privilege request. This 4039 * includes almost all network privileges, many system 4040 * configuration privileges. 4041 */ 4042 return (EPERM); 4043 } 4044 } 4045 4046 /* 4047 * Return the part of pr2's name that is relative to pr1, or the whole name 4048 * if it does not directly follow. 4049 */ 4050 4051 char * 4052 prison_name(struct prison *pr1, struct prison *pr2) 4053 { 4054 char *name; 4055 4056 /* Jails see themselves as "" (if they see themselves at all). */ 4057 if (pr1 == pr2) 4058 return ""; 4059 name = pr2->pr_name; 4060 if (prison_ischild(pr1, pr2)) { 4061 /* 4062 * pr1 isn't locked (and allprison_lock may not be either) 4063 * so its length can't be counted on. But the number of dots 4064 * can be counted on - and counted. 4065 */ 4066 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 4067 name = strchr(name, '.') + 1; 4068 } 4069 return (name); 4070 } 4071 4072 /* 4073 * Return the part of pr2's path that is relative to pr1, or the whole path 4074 * if it does not directly follow. 4075 */ 4076 static char * 4077 prison_path(struct prison *pr1, struct prison *pr2) 4078 { 4079 char *path1, *path2; 4080 int len1; 4081 4082 path1 = pr1->pr_path; 4083 path2 = pr2->pr_path; 4084 if (!strcmp(path1, "/")) 4085 return (path2); 4086 len1 = strlen(path1); 4087 if (strncmp(path1, path2, len1)) 4088 return (path2); 4089 if (path2[len1] == '\0') 4090 return "/"; 4091 if (path2[len1] == '/') 4092 return (path2 + len1); 4093 return (path2); 4094 } 4095 4096 4097 /* 4098 * Jail-related sysctls. 4099 */ 4100 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 4101 "Jails"); 4102 4103 static int 4104 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4105 { 4106 struct xprison *xp; 4107 struct prison *pr, *cpr; 4108 #ifdef INET 4109 struct in_addr *ip4 = NULL; 4110 int ip4s = 0; 4111 #endif 4112 #ifdef INET6 4113 struct in6_addr *ip6 = NULL; 4114 int ip6s = 0; 4115 #endif 4116 int descend, error; 4117 4118 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4119 pr = req->td->td_ucred->cr_prison; 4120 error = 0; 4121 sx_slock(&allprison_lock); 4122 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4123 #if defined(INET) || defined(INET6) 4124 again: 4125 #endif 4126 mtx_lock(&cpr->pr_mtx); 4127 #ifdef INET 4128 if (cpr->pr_ip4s > 0) { 4129 if (ip4s < cpr->pr_ip4s) { 4130 ip4s = cpr->pr_ip4s; 4131 mtx_unlock(&cpr->pr_mtx); 4132 ip4 = realloc(ip4, ip4s * 4133 sizeof(struct in_addr), M_TEMP, M_WAITOK); 4134 goto again; 4135 } 4136 bcopy(cpr->pr_ip4, ip4, 4137 cpr->pr_ip4s * sizeof(struct in_addr)); 4138 } 4139 #endif 4140 #ifdef INET6 4141 if (cpr->pr_ip6s > 0) { 4142 if (ip6s < cpr->pr_ip6s) { 4143 ip6s = cpr->pr_ip6s; 4144 mtx_unlock(&cpr->pr_mtx); 4145 ip6 = realloc(ip6, ip6s * 4146 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 4147 goto again; 4148 } 4149 bcopy(cpr->pr_ip6, ip6, 4150 cpr->pr_ip6s * sizeof(struct in6_addr)); 4151 } 4152 #endif 4153 if (cpr->pr_ref == 0) { 4154 mtx_unlock(&cpr->pr_mtx); 4155 continue; 4156 } 4157 bzero(xp, sizeof(*xp)); 4158 xp->pr_version = XPRISON_VERSION; 4159 xp->pr_id = cpr->pr_id; 4160 xp->pr_state = cpr->pr_uref > 0 4161 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 4162 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4163 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4164 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4165 #ifdef INET 4166 xp->pr_ip4s = cpr->pr_ip4s; 4167 #endif 4168 #ifdef INET6 4169 xp->pr_ip6s = cpr->pr_ip6s; 4170 #endif 4171 mtx_unlock(&cpr->pr_mtx); 4172 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4173 if (error) 4174 break; 4175 #ifdef INET 4176 if (xp->pr_ip4s > 0) { 4177 error = SYSCTL_OUT(req, ip4, 4178 xp->pr_ip4s * sizeof(struct in_addr)); 4179 if (error) 4180 break; 4181 } 4182 #endif 4183 #ifdef INET6 4184 if (xp->pr_ip6s > 0) { 4185 error = SYSCTL_OUT(req, ip6, 4186 xp->pr_ip6s * sizeof(struct in6_addr)); 4187 if (error) 4188 break; 4189 } 4190 #endif 4191 } 4192 sx_sunlock(&allprison_lock); 4193 free(xp, M_TEMP); 4194 #ifdef INET 4195 free(ip4, M_TEMP); 4196 #endif 4197 #ifdef INET6 4198 free(ip6, M_TEMP); 4199 #endif 4200 return (error); 4201 } 4202 4203 SYSCTL_OID(_security_jail, OID_AUTO, list, 4204 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4205 sysctl_jail_list, "S", "List of active jails"); 4206 4207 static int 4208 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4209 { 4210 int error, injail; 4211 4212 injail = jailed(req->td->td_ucred); 4213 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4214 4215 return (error); 4216 } 4217 4218 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4219 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4220 sysctl_jail_jailed, "I", "Process in jail?"); 4221 4222 static int 4223 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4224 { 4225 int error, havevnet; 4226 #ifdef VIMAGE 4227 struct ucred *cred = req->td->td_ucred; 4228 4229 havevnet = jailed(cred) && prison_owns_vnet(cred); 4230 #else 4231 havevnet = 0; 4232 #endif 4233 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4234 4235 return (error); 4236 } 4237 4238 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4239 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4240 sysctl_jail_vnet, "I", "Jail owns VNET?"); 4241 4242 #if defined(INET) || defined(INET6) 4243 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4244 &jail_max_af_ips, 0, 4245 "Number of IP addresses a jail may have at most per address family"); 4246 #endif 4247 4248 /* 4249 * Default parameters for jail(2) compatability. For historical reasons, 4250 * the sysctl names have varying similarity to the parameter names. Prisons 4251 * just see their own parameters, and can't change them. 4252 */ 4253 static int 4254 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4255 { 4256 struct prison *pr; 4257 int allow, error, i; 4258 4259 pr = req->td->td_ucred->cr_prison; 4260 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4261 4262 /* Get the current flag value, and convert it to a boolean. */ 4263 i = (allow & arg2) ? 1 : 0; 4264 if (arg1 != NULL) 4265 i = !i; 4266 error = sysctl_handle_int(oidp, &i, 0, req); 4267 if (error || !req->newptr) 4268 return (error); 4269 i = i ? arg2 : 0; 4270 if (arg1 != NULL) 4271 i ^= arg2; 4272 /* 4273 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4274 * for writing. 4275 */ 4276 mtx_lock(&prison0.pr_mtx); 4277 jail_default_allow = (jail_default_allow & ~arg2) | i; 4278 mtx_unlock(&prison0.pr_mtx); 4279 return (0); 4280 } 4281 4282 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4283 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4284 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4285 "Processes in jail can set their hostnames"); 4286 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4287 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4288 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4289 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 4290 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4291 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4292 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4293 "Processes in jail can use System V IPC primitives"); 4294 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4295 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4296 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4297 "Prison root can create raw sockets"); 4298 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4299 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4300 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4301 "Processes in jail can alter system file flags"); 4302 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4303 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4304 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4305 "Processes in jail can mount/unmount jail-friendly file systems"); 4306 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed, 4307 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4308 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I", 4309 "Processes in jail can mount the devfs file system"); 4310 SYSCTL_PROC(_security_jail, OID_AUTO, mount_fdescfs_allowed, 4311 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4312 NULL, PR_ALLOW_MOUNT_FDESCFS, sysctl_jail_default_allow, "I", 4313 "Processes in jail can mount the fdescfs file system"); 4314 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed, 4315 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4316 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I", 4317 "Processes in jail can mount the nullfs file system"); 4318 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed, 4319 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4320 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I", 4321 "Processes in jail can mount the procfs file system"); 4322 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linprocfs_allowed, 4323 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4324 NULL, PR_ALLOW_MOUNT_LINPROCFS, sysctl_jail_default_allow, "I", 4325 "Processes in jail can mount the linprocfs file system"); 4326 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linsysfs_allowed, 4327 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4328 NULL, PR_ALLOW_MOUNT_LINSYSFS, sysctl_jail_default_allow, "I", 4329 "Processes in jail can mount the linsysfs file system"); 4330 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed, 4331 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4332 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I", 4333 "Processes in jail can mount the tmpfs file system"); 4334 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed, 4335 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4336 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I", 4337 "Processes in jail can mount the zfs file system"); 4338 4339 static int 4340 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4341 { 4342 struct prison *pr; 4343 int level, error; 4344 4345 pr = req->td->td_ucred->cr_prison; 4346 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4347 error = sysctl_handle_int(oidp, &level, 0, req); 4348 if (error || !req->newptr) 4349 return (error); 4350 *(int *)arg1 = level; 4351 return (0); 4352 } 4353 4354 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4355 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4356 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4357 sysctl_jail_default_level, "I", 4358 "Processes in jail cannot see all mounted file systems"); 4359 4360 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4361 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4362 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4363 sysctl_jail_default_level, "I", 4364 "Ruleset for the devfs filesystem in jail"); 4365 4366 /* 4367 * Nodes to describe jail parameters. Maximum length of string parameters 4368 * is returned in the string itself, and the other parameters exist merely 4369 * to make themselves and their types known. 4370 */ 4371 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4372 "Jail parameters"); 4373 4374 int 4375 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4376 { 4377 int i; 4378 long l; 4379 size_t s; 4380 char numbuf[12]; 4381 4382 switch (oidp->oid_kind & CTLTYPE) 4383 { 4384 case CTLTYPE_LONG: 4385 case CTLTYPE_ULONG: 4386 l = 0; 4387 #ifdef SCTL_MASK32 4388 if (!(req->flags & SCTL_MASK32)) 4389 #endif 4390 return (SYSCTL_OUT(req, &l, sizeof(l))); 4391 case CTLTYPE_INT: 4392 case CTLTYPE_UINT: 4393 i = 0; 4394 return (SYSCTL_OUT(req, &i, sizeof(i))); 4395 case CTLTYPE_STRING: 4396 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4397 return 4398 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4399 case CTLTYPE_STRUCT: 4400 s = (size_t)arg2; 4401 return (SYSCTL_OUT(req, &s, sizeof(s))); 4402 } 4403 return (0); 4404 } 4405 4406 /* 4407 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at 4408 * jail creation time but cannot be changed in an existing jail. 4409 */ 4410 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4411 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4412 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4413 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4414 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4415 "I", "Jail secure level"); 4416 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 4417 "Jail value for kern.osreldate and uname -K"); 4418 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 4419 "Jail value for kern.osrelease and uname -r"); 4420 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4421 "I", "Jail cannot see all mounted file systems"); 4422 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4423 "I", "Ruleset for in-jail devfs mounts"); 4424 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4425 "B", "Jail persistence"); 4426 #ifdef VIMAGE 4427 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4428 "E,jailsys", "Virtual network stack"); 4429 #endif 4430 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4431 "B", "Jail is in the process of shutting down"); 4432 4433 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4434 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4435 "I", "Current number of child jails"); 4436 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4437 "I", "Maximum number of child jails"); 4438 4439 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4440 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4441 "Jail hostname"); 4442 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4443 "Jail NIS domainname"); 4444 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4445 "Jail host UUID"); 4446 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4447 "LU", "Jail host ID"); 4448 4449 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4450 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4451 4452 #ifdef INET 4453 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4454 "Jail IPv4 address virtualization"); 4455 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4456 "S,in_addr,a", "Jail IPv4 addresses"); 4457 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4458 "B", "Do (not) use IPv4 source address selection rather than the " 4459 "primary jail IPv4 address."); 4460 #endif 4461 #ifdef INET6 4462 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4463 "Jail IPv6 address virtualization"); 4464 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4465 "S,in6_addr,a", "Jail IPv6 addresses"); 4466 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4467 "B", "Do (not) use IPv6 source address selection rather than the " 4468 "primary jail IPv6 address."); 4469 #endif 4470 4471 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4472 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4473 "B", "Jail may set hostname"); 4474 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4475 "B", "Jail may use SYSV IPC"); 4476 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4477 "B", "Jail may create raw sockets"); 4478 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4479 "B", "Jail may alter system file flags"); 4480 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4481 "B", "Jail may set file quotas"); 4482 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4483 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4484 4485 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4486 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4487 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4488 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW, 4489 "B", "Jail may mount the devfs file system"); 4490 SYSCTL_JAIL_PARAM(_allow_mount, fdescfs, CTLTYPE_INT | CTLFLAG_RW, 4491 "B", "Jail may mount the fdescfs file system"); 4492 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW, 4493 "B", "Jail may mount the nullfs file system"); 4494 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW, 4495 "B", "Jail may mount the procfs file system"); 4496 SYSCTL_JAIL_PARAM(_allow_mount, linprocfs, CTLTYPE_INT | CTLFLAG_RW, 4497 "B", "Jail may mount the linprocfs file system"); 4498 SYSCTL_JAIL_PARAM(_allow_mount, linsysfs, CTLTYPE_INT | CTLFLAG_RW, 4499 "B", "Jail may mount the linsysfs file system"); 4500 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW, 4501 "B", "Jail may mount the tmpfs file system"); 4502 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW, 4503 "B", "Jail may mount the zfs file system"); 4504 4505 #ifdef RACCT 4506 void 4507 prison_racct_foreach(void (*callback)(struct racct *racct, 4508 void *arg2, void *arg3), void *arg2, void *arg3) 4509 { 4510 struct prison_racct *prr; 4511 4512 ASSERT_RACCT_ENABLED(); 4513 4514 sx_slock(&allprison_lock); 4515 LIST_FOREACH(prr, &allprison_racct, prr_next) 4516 (callback)(prr->prr_racct, arg2, arg3); 4517 sx_sunlock(&allprison_lock); 4518 } 4519 4520 static struct prison_racct * 4521 prison_racct_find_locked(const char *name) 4522 { 4523 struct prison_racct *prr; 4524 4525 ASSERT_RACCT_ENABLED(); 4526 sx_assert(&allprison_lock, SA_XLOCKED); 4527 4528 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4529 return (NULL); 4530 4531 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4532 if (strcmp(name, prr->prr_name) != 0) 4533 continue; 4534 4535 /* Found prison_racct with a matching name? */ 4536 prison_racct_hold(prr); 4537 return (prr); 4538 } 4539 4540 /* Add new prison_racct. */ 4541 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4542 racct_create(&prr->prr_racct); 4543 4544 strcpy(prr->prr_name, name); 4545 refcount_init(&prr->prr_refcount, 1); 4546 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4547 4548 return (prr); 4549 } 4550 4551 struct prison_racct * 4552 prison_racct_find(const char *name) 4553 { 4554 struct prison_racct *prr; 4555 4556 ASSERT_RACCT_ENABLED(); 4557 4558 sx_xlock(&allprison_lock); 4559 prr = prison_racct_find_locked(name); 4560 sx_xunlock(&allprison_lock); 4561 return (prr); 4562 } 4563 4564 void 4565 prison_racct_hold(struct prison_racct *prr) 4566 { 4567 4568 ASSERT_RACCT_ENABLED(); 4569 4570 refcount_acquire(&prr->prr_refcount); 4571 } 4572 4573 static void 4574 prison_racct_free_locked(struct prison_racct *prr) 4575 { 4576 4577 ASSERT_RACCT_ENABLED(); 4578 sx_assert(&allprison_lock, SA_XLOCKED); 4579 4580 if (refcount_release(&prr->prr_refcount)) { 4581 racct_destroy(&prr->prr_racct); 4582 LIST_REMOVE(prr, prr_next); 4583 free(prr, M_PRISON_RACCT); 4584 } 4585 } 4586 4587 void 4588 prison_racct_free(struct prison_racct *prr) 4589 { 4590 int old; 4591 4592 ASSERT_RACCT_ENABLED(); 4593 sx_assert(&allprison_lock, SA_UNLOCKED); 4594 4595 old = prr->prr_refcount; 4596 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4597 return; 4598 4599 sx_xlock(&allprison_lock); 4600 prison_racct_free_locked(prr); 4601 sx_xunlock(&allprison_lock); 4602 } 4603 4604 static void 4605 prison_racct_attach(struct prison *pr) 4606 { 4607 struct prison_racct *prr; 4608 4609 ASSERT_RACCT_ENABLED(); 4610 sx_assert(&allprison_lock, SA_XLOCKED); 4611 4612 prr = prison_racct_find_locked(pr->pr_name); 4613 KASSERT(prr != NULL, ("cannot find prison_racct")); 4614 4615 pr->pr_prison_racct = prr; 4616 } 4617 4618 /* 4619 * Handle jail renaming. From the racct point of view, renaming means 4620 * moving from one prison_racct to another. 4621 */ 4622 static void 4623 prison_racct_modify(struct prison *pr) 4624 { 4625 struct proc *p; 4626 struct ucred *cred; 4627 struct prison_racct *oldprr; 4628 4629 ASSERT_RACCT_ENABLED(); 4630 4631 sx_slock(&allproc_lock); 4632 sx_xlock(&allprison_lock); 4633 4634 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4635 sx_xunlock(&allprison_lock); 4636 sx_sunlock(&allproc_lock); 4637 return; 4638 } 4639 4640 oldprr = pr->pr_prison_racct; 4641 pr->pr_prison_racct = NULL; 4642 4643 prison_racct_attach(pr); 4644 4645 /* 4646 * Move resource utilisation records. 4647 */ 4648 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4649 4650 /* 4651 * Force rctl to reattach rules to processes. 4652 */ 4653 FOREACH_PROC_IN_SYSTEM(p) { 4654 PROC_LOCK(p); 4655 cred = crhold(p->p_ucred); 4656 PROC_UNLOCK(p); 4657 racct_proc_ucred_changed(p, cred, cred); 4658 crfree(cred); 4659 } 4660 4661 sx_sunlock(&allproc_lock); 4662 prison_racct_free_locked(oldprr); 4663 sx_xunlock(&allprison_lock); 4664 } 4665 4666 static void 4667 prison_racct_detach(struct prison *pr) 4668 { 4669 4670 ASSERT_RACCT_ENABLED(); 4671 sx_assert(&allprison_lock, SA_UNLOCKED); 4672 4673 if (pr->pr_prison_racct == NULL) 4674 return; 4675 prison_racct_free(pr->pr_prison_racct); 4676 pr->pr_prison_racct = NULL; 4677 } 4678 #endif /* RACCT */ 4679 4680 #ifdef DDB 4681 4682 static void 4683 db_show_prison(struct prison *pr) 4684 { 4685 int fi; 4686 #if defined(INET) || defined(INET6) 4687 int ii; 4688 #endif 4689 unsigned jsf; 4690 #ifdef INET6 4691 char ip6buf[INET6_ADDRSTRLEN]; 4692 #endif 4693 4694 db_printf("prison %p:\n", pr); 4695 db_printf(" jid = %d\n", pr->pr_id); 4696 db_printf(" name = %s\n", pr->pr_name); 4697 db_printf(" parent = %p\n", pr->pr_parent); 4698 db_printf(" ref = %d\n", pr->pr_ref); 4699 db_printf(" uref = %d\n", pr->pr_uref); 4700 db_printf(" path = %s\n", pr->pr_path); 4701 db_printf(" cpuset = %d\n", pr->pr_cpuset 4702 ? pr->pr_cpuset->cs_id : -1); 4703 #ifdef VIMAGE 4704 db_printf(" vnet = %p\n", pr->pr_vnet); 4705 #endif 4706 db_printf(" root = %p\n", pr->pr_root); 4707 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4708 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4709 db_printf(" children.max = %d\n", pr->pr_childmax); 4710 db_printf(" children.cur = %d\n", pr->pr_childcount); 4711 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4712 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4713 db_printf(" flags = 0x%x", pr->pr_flags); 4714 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4715 fi++) 4716 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4717 db_printf(" %s", pr_flag_names[fi]); 4718 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4719 fi++) { 4720 jsf = pr->pr_flags & 4721 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4722 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4723 pr_flag_jailsys[fi].disable && 4724 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4725 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4726 : "inherit"); 4727 } 4728 db_printf(" allow = 0x%x", pr->pr_allow); 4729 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4730 fi++) 4731 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4732 db_printf(" %s", pr_allow_names[fi]); 4733 db_printf("\n"); 4734 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4735 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4736 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4737 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4738 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4739 #ifdef INET 4740 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4741 for (ii = 0; ii < pr->pr_ip4s; ii++) 4742 db_printf(" %s %s\n", 4743 ii == 0 ? "ip4.addr =" : " ", 4744 inet_ntoa(pr->pr_ip4[ii])); 4745 #endif 4746 #ifdef INET6 4747 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4748 for (ii = 0; ii < pr->pr_ip6s; ii++) 4749 db_printf(" %s %s\n", 4750 ii == 0 ? "ip6.addr =" : " ", 4751 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4752 #endif 4753 } 4754 4755 DB_SHOW_COMMAND(prison, db_show_prison_command) 4756 { 4757 struct prison *pr; 4758 4759 if (!have_addr) { 4760 /* 4761 * Show all prisons in the list, and prison0 which is not 4762 * listed. 4763 */ 4764 db_show_prison(&prison0); 4765 if (!db_pager_quit) { 4766 TAILQ_FOREACH(pr, &allprison, pr_list) { 4767 db_show_prison(pr); 4768 if (db_pager_quit) 4769 break; 4770 } 4771 } 4772 return; 4773 } 4774 4775 if (addr == 0) 4776 pr = &prison0; 4777 else { 4778 /* Look for a prison with the ID and with references. */ 4779 TAILQ_FOREACH(pr, &allprison, pr_list) 4780 if (pr->pr_id == addr && pr->pr_ref > 0) 4781 break; 4782 if (pr == NULL) 4783 /* Look again, without requiring a reference. */ 4784 TAILQ_FOREACH(pr, &allprison, pr_list) 4785 if (pr->pr_id == addr) 4786 break; 4787 if (pr == NULL) 4788 /* Assume address points to a valid prison. */ 4789 pr = (struct prison *)addr; 4790 } 4791 db_show_prison(pr); 4792 } 4793 4794 #endif /* DDB */
Cache object: 7123a9d3098b5a0dab48b321db1b0fb3
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]