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/10.1/sys/kern/kern_jail.c 271622 2014-09-15 13:01:47Z trasz $"); 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 }; 211 const size_t pr_allow_names_size = sizeof(pr_allow_names); 212 213 static char *pr_allow_nonames[] = { 214 "allow.noset_hostname", 215 "allow.nosysvipc", 216 "allow.noraw_sockets", 217 "allow.nochflags", 218 "allow.nomount", 219 "allow.noquotas", 220 "allow.nosocket_af", 221 "allow.mount.nodevfs", 222 "allow.mount.nonullfs", 223 "allow.mount.nozfs", 224 "allow.mount.noprocfs", 225 "allow.mount.notmpfs", 226 }; 227 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames); 228 229 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME 230 #define JAIL_DEFAULT_ENFORCE_STATFS 2 231 #define JAIL_DEFAULT_DEVFS_RSNUM 0 232 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 233 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 234 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 235 #if defined(INET) || defined(INET6) 236 static unsigned jail_max_af_ips = 255; 237 #endif 238 239 #ifdef INET 240 static int 241 qcmp_v4(const void *ip1, const void *ip2) 242 { 243 in_addr_t iaa, iab; 244 245 /* 246 * We need to compare in HBO here to get the list sorted as expected 247 * by the result of the code. Sorting NBO addresses gives you 248 * interesting results. If you do not understand, do not try. 249 */ 250 iaa = ntohl(((const struct in_addr *)ip1)->s_addr); 251 iab = ntohl(((const struct in_addr *)ip2)->s_addr); 252 253 /* 254 * Do not simply return the difference of the two numbers, the int is 255 * not wide enough. 256 */ 257 if (iaa > iab) 258 return (1); 259 else if (iaa < iab) 260 return (-1); 261 else 262 return (0); 263 } 264 #endif 265 266 #ifdef INET6 267 static int 268 qcmp_v6(const void *ip1, const void *ip2) 269 { 270 const struct in6_addr *ia6a, *ia6b; 271 int i, rc; 272 273 ia6a = (const struct in6_addr *)ip1; 274 ia6b = (const struct in6_addr *)ip2; 275 276 rc = 0; 277 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { 278 if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) 279 rc = 1; 280 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) 281 rc = -1; 282 } 283 return (rc); 284 } 285 #endif 286 287 /* 288 * struct jail_args { 289 * struct jail *jail; 290 * }; 291 */ 292 int 293 sys_jail(struct thread *td, struct jail_args *uap) 294 { 295 uint32_t version; 296 int error; 297 struct jail j; 298 299 error = copyin(uap->jail, &version, sizeof(uint32_t)); 300 if (error) 301 return (error); 302 303 switch (version) { 304 case 0: 305 { 306 struct jail_v0 j0; 307 308 /* FreeBSD single IPv4 jails. */ 309 bzero(&j, sizeof(struct jail)); 310 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 311 if (error) 312 return (error); 313 j.version = j0.version; 314 j.path = j0.path; 315 j.hostname = j0.hostname; 316 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 317 break; 318 } 319 320 case 1: 321 /* 322 * Version 1 was used by multi-IPv4 jail implementations 323 * that never made it into the official kernel. 324 */ 325 return (EINVAL); 326 327 case 2: /* JAIL_API_VERSION */ 328 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 329 error = copyin(uap->jail, &j, sizeof(struct jail)); 330 if (error) 331 return (error); 332 break; 333 334 default: 335 /* Sci-Fi jails are not supported, sorry. */ 336 return (EINVAL); 337 } 338 return (kern_jail(td, &j)); 339 } 340 341 int 342 kern_jail(struct thread *td, struct jail *j) 343 { 344 struct iovec optiov[2 * (4 345 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0]) 346 #ifdef INET 347 + 1 348 #endif 349 #ifdef INET6 350 + 1 351 #endif 352 )]; 353 struct uio opt; 354 char *u_path, *u_hostname, *u_name; 355 #ifdef INET 356 uint32_t ip4s; 357 struct in_addr *u_ip4; 358 #endif 359 #ifdef INET6 360 struct in6_addr *u_ip6; 361 #endif 362 size_t tmplen; 363 int error, enforce_statfs, fi; 364 365 bzero(&optiov, sizeof(optiov)); 366 opt.uio_iov = optiov; 367 opt.uio_iovcnt = 0; 368 opt.uio_offset = -1; 369 opt.uio_resid = -1; 370 opt.uio_segflg = UIO_SYSSPACE; 371 opt.uio_rw = UIO_READ; 372 opt.uio_td = td; 373 374 /* Set permissions for top-level jails from sysctls. */ 375 if (!jailed(td->td_ucred)) { 376 for (fi = 0; fi < sizeof(pr_allow_names) / 377 sizeof(pr_allow_names[0]); fi++) { 378 optiov[opt.uio_iovcnt].iov_base = 379 (jail_default_allow & (1 << fi)) 380 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 381 optiov[opt.uio_iovcnt].iov_len = 382 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 383 opt.uio_iovcnt += 2; 384 } 385 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 386 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 387 opt.uio_iovcnt++; 388 enforce_statfs = jail_default_enforce_statfs; 389 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 390 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 391 opt.uio_iovcnt++; 392 } 393 394 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 395 #ifdef INET 396 ip4s = (j->version == 0) ? 1 : j->ip4s; 397 if (ip4s > jail_max_af_ips) 398 return (EINVAL); 399 tmplen += ip4s * sizeof(struct in_addr); 400 #else 401 if (j->ip4s > 0) 402 return (EINVAL); 403 #endif 404 #ifdef INET6 405 if (j->ip6s > jail_max_af_ips) 406 return (EINVAL); 407 tmplen += j->ip6s * sizeof(struct in6_addr); 408 #else 409 if (j->ip6s > 0) 410 return (EINVAL); 411 #endif 412 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 413 u_hostname = u_path + MAXPATHLEN; 414 u_name = u_hostname + MAXHOSTNAMELEN; 415 #ifdef INET 416 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 417 #endif 418 #ifdef INET6 419 #ifdef INET 420 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 421 #else 422 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 423 #endif 424 #endif 425 optiov[opt.uio_iovcnt].iov_base = "path"; 426 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 427 opt.uio_iovcnt++; 428 optiov[opt.uio_iovcnt].iov_base = u_path; 429 error = copyinstr(j->path, u_path, MAXPATHLEN, 430 &optiov[opt.uio_iovcnt].iov_len); 431 if (error) { 432 free(u_path, M_TEMP); 433 return (error); 434 } 435 opt.uio_iovcnt++; 436 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 437 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 438 opt.uio_iovcnt++; 439 optiov[opt.uio_iovcnt].iov_base = u_hostname; 440 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 441 &optiov[opt.uio_iovcnt].iov_len); 442 if (error) { 443 free(u_path, M_TEMP); 444 return (error); 445 } 446 opt.uio_iovcnt++; 447 if (j->jailname != NULL) { 448 optiov[opt.uio_iovcnt].iov_base = "name"; 449 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 450 opt.uio_iovcnt++; 451 optiov[opt.uio_iovcnt].iov_base = u_name; 452 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 453 &optiov[opt.uio_iovcnt].iov_len); 454 if (error) { 455 free(u_path, M_TEMP); 456 return (error); 457 } 458 opt.uio_iovcnt++; 459 } 460 #ifdef INET 461 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 462 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 463 opt.uio_iovcnt++; 464 optiov[opt.uio_iovcnt].iov_base = u_ip4; 465 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 466 if (j->version == 0) 467 u_ip4->s_addr = j->ip4s; 468 else { 469 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 470 if (error) { 471 free(u_path, M_TEMP); 472 return (error); 473 } 474 } 475 opt.uio_iovcnt++; 476 #endif 477 #ifdef INET6 478 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 479 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 480 opt.uio_iovcnt++; 481 optiov[opt.uio_iovcnt].iov_base = u_ip6; 482 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 483 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 484 if (error) { 485 free(u_path, M_TEMP); 486 return (error); 487 } 488 opt.uio_iovcnt++; 489 #endif 490 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]), 491 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 492 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 493 free(u_path, M_TEMP); 494 return (error); 495 } 496 497 498 /* 499 * struct jail_set_args { 500 * struct iovec *iovp; 501 * unsigned int iovcnt; 502 * int flags; 503 * }; 504 */ 505 int 506 sys_jail_set(struct thread *td, struct jail_set_args *uap) 507 { 508 struct uio *auio; 509 int error; 510 511 /* Check that we have an even number of iovecs. */ 512 if (uap->iovcnt & 1) 513 return (EINVAL); 514 515 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 516 if (error) 517 return (error); 518 error = kern_jail_set(td, auio, uap->flags); 519 free(auio, M_IOV); 520 return (error); 521 } 522 523 int 524 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 525 { 526 struct nameidata nd; 527 #ifdef INET 528 struct in_addr *ip4; 529 #endif 530 #ifdef INET6 531 struct in6_addr *ip6; 532 #endif 533 struct vfsopt *opt; 534 struct vfsoptlist *opts; 535 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 536 struct vnode *root; 537 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 538 char *g_path; 539 #if defined(INET) || defined(INET6) 540 struct prison *tppr; 541 void *op; 542 #endif 543 unsigned long hid; 544 size_t namelen, onamelen; 545 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos; 546 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 547 int fi, jid, jsys, len, level; 548 int childmax, rsnum, slevel; 549 int fullpath_disabled; 550 #if defined(INET) || defined(INET6) 551 int ii, ij; 552 #endif 553 #ifdef INET 554 int ip4s, redo_ip4; 555 #endif 556 #ifdef INET6 557 int ip6s, redo_ip6; 558 #endif 559 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 560 unsigned tallow; 561 char numbuf[12]; 562 563 error = priv_check(td, PRIV_JAIL_SET); 564 if (!error && (flags & JAIL_ATTACH)) 565 error = priv_check(td, PRIV_JAIL_ATTACH); 566 if (error) 567 return (error); 568 mypr = ppr = td->td_ucred->cr_prison; 569 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 570 return (EPERM); 571 if (flags & ~JAIL_SET_MASK) 572 return (EINVAL); 573 574 /* 575 * Check all the parameters before committing to anything. Not all 576 * errors can be caught early, but we may as well try. Also, this 577 * takes care of some expensive stuff (path lookup) before getting 578 * the allprison lock. 579 * 580 * XXX Jails are not filesystems, and jail parameters are not mount 581 * options. But it makes more sense to re-use the vfsopt code 582 * than duplicate it under a different name. 583 */ 584 error = vfs_buildopts(optuio, &opts); 585 if (error) 586 return (error); 587 #ifdef INET 588 ip4 = NULL; 589 #endif 590 #ifdef INET6 591 ip6 = NULL; 592 #endif 593 g_path = NULL; 594 595 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 596 if (error == ENOENT) 597 jid = 0; 598 else if (error != 0) 599 goto done_free; 600 601 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 602 if (error == ENOENT) 603 gotslevel = 0; 604 else if (error != 0) 605 goto done_free; 606 else 607 gotslevel = 1; 608 609 error = 610 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 611 if (error == ENOENT) 612 gotchildmax = 0; 613 else if (error != 0) 614 goto done_free; 615 else 616 gotchildmax = 1; 617 618 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 619 if (error == ENOENT) 620 gotenforce = 0; 621 else if (error != 0) 622 goto done_free; 623 else if (enforce < 0 || enforce > 2) { 624 error = EINVAL; 625 goto done_free; 626 } else 627 gotenforce = 1; 628 629 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 630 if (error == ENOENT) 631 gotrsnum = 0; 632 else if (error != 0) 633 goto done_free; 634 else 635 gotrsnum = 1; 636 637 pr_flags = ch_flags = 0; 638 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 639 fi++) { 640 if (pr_flag_names[fi] == NULL) 641 continue; 642 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 643 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 644 } 645 ch_flags |= pr_flags; 646 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 647 fi++) { 648 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys, 649 sizeof(jsys)); 650 if (error == ENOENT) 651 continue; 652 if (error != 0) 653 goto done_free; 654 switch (jsys) { 655 case JAIL_SYS_DISABLE: 656 if (!pr_flag_jailsys[fi].disable) { 657 error = EINVAL; 658 goto done_free; 659 } 660 pr_flags |= pr_flag_jailsys[fi].disable; 661 break; 662 case JAIL_SYS_NEW: 663 pr_flags |= pr_flag_jailsys[fi].new; 664 break; 665 case JAIL_SYS_INHERIT: 666 break; 667 default: 668 error = EINVAL; 669 goto done_free; 670 } 671 ch_flags |= 672 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable; 673 } 674 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 675 && !(pr_flags & PR_PERSIST)) { 676 error = EINVAL; 677 vfs_opterror(opts, "new jail must persist or attach"); 678 goto done_errmsg; 679 } 680 #ifdef VIMAGE 681 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 682 error = EINVAL; 683 vfs_opterror(opts, "vnet cannot be changed after creation"); 684 goto done_errmsg; 685 } 686 #endif 687 #ifdef INET 688 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 689 error = EINVAL; 690 vfs_opterror(opts, "ip4 cannot be changed after creation"); 691 goto done_errmsg; 692 } 693 #endif 694 #ifdef INET6 695 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 696 error = EINVAL; 697 vfs_opterror(opts, "ip6 cannot be changed after creation"); 698 goto done_errmsg; 699 } 700 #endif 701 702 pr_allow = ch_allow = 0; 703 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 704 fi++) { 705 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 706 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 707 } 708 ch_allow |= pr_allow; 709 710 error = vfs_getopt(opts, "name", (void **)&name, &len); 711 if (error == ENOENT) 712 name = NULL; 713 else if (error != 0) 714 goto done_free; 715 else { 716 if (len == 0 || name[len - 1] != '\0') { 717 error = EINVAL; 718 goto done_free; 719 } 720 if (len > MAXHOSTNAMELEN) { 721 error = ENAMETOOLONG; 722 goto done_free; 723 } 724 } 725 726 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 727 if (error == ENOENT) 728 host = NULL; 729 else if (error != 0) 730 goto done_free; 731 else { 732 ch_flags |= PR_HOST; 733 pr_flags |= PR_HOST; 734 if (len == 0 || host[len - 1] != '\0') { 735 error = EINVAL; 736 goto done_free; 737 } 738 if (len > MAXHOSTNAMELEN) { 739 error = ENAMETOOLONG; 740 goto done_free; 741 } 742 } 743 744 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 745 if (error == ENOENT) 746 domain = NULL; 747 else if (error != 0) 748 goto done_free; 749 else { 750 ch_flags |= PR_HOST; 751 pr_flags |= PR_HOST; 752 if (len == 0 || domain[len - 1] != '\0') { 753 error = EINVAL; 754 goto done_free; 755 } 756 if (len > MAXHOSTNAMELEN) { 757 error = ENAMETOOLONG; 758 goto done_free; 759 } 760 } 761 762 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 763 if (error == ENOENT) 764 uuid = NULL; 765 else if (error != 0) 766 goto done_free; 767 else { 768 ch_flags |= PR_HOST; 769 pr_flags |= PR_HOST; 770 if (len == 0 || uuid[len - 1] != '\0') { 771 error = EINVAL; 772 goto done_free; 773 } 774 if (len > HOSTUUIDLEN) { 775 error = ENAMETOOLONG; 776 goto done_free; 777 } 778 } 779 780 #ifdef COMPAT_FREEBSD32 781 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 782 uint32_t hid32; 783 784 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 785 hid = hid32; 786 } else 787 #endif 788 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 789 if (error == ENOENT) 790 gothid = 0; 791 else if (error != 0) 792 goto done_free; 793 else { 794 gothid = 1; 795 ch_flags |= PR_HOST; 796 pr_flags |= PR_HOST; 797 } 798 799 #ifdef INET 800 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 801 if (error == ENOENT) 802 ip4s = (pr_flags & PR_IP4_DISABLE) ? 0 : -1; 803 else if (error != 0) 804 goto done_free; 805 else if (ip4s & (sizeof(*ip4) - 1)) { 806 error = EINVAL; 807 goto done_free; 808 } else { 809 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE; 810 if (ip4s == 0) 811 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE; 812 else { 813 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER; 814 ip4s /= sizeof(*ip4); 815 if (ip4s > jail_max_af_ips) { 816 error = EINVAL; 817 vfs_opterror(opts, "too many IPv4 addresses"); 818 goto done_errmsg; 819 } 820 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 821 bcopy(op, ip4, ip4s * sizeof(*ip4)); 822 /* 823 * IP addresses are all sorted but ip[0] to preserve 824 * the primary IP address as given from userland. 825 * This special IP is used for unbound outgoing 826 * connections as well for "loopback" traffic in case 827 * source address selection cannot find any more fitting 828 * address to connect from. 829 */ 830 if (ip4s > 1) 831 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4); 832 /* 833 * Check for duplicate addresses and do some simple 834 * zero and broadcast checks. If users give other bogus 835 * addresses it is their problem. 836 * 837 * We do not have to care about byte order for these 838 * checks so we will do them in NBO. 839 */ 840 for (ii = 0; ii < ip4s; ii++) { 841 if (ip4[ii].s_addr == INADDR_ANY || 842 ip4[ii].s_addr == INADDR_BROADCAST) { 843 error = EINVAL; 844 goto done_free; 845 } 846 if ((ii+1) < ip4s && 847 (ip4[0].s_addr == ip4[ii+1].s_addr || 848 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 849 error = EINVAL; 850 goto done_free; 851 } 852 } 853 } 854 } 855 #endif 856 857 #ifdef INET6 858 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 859 if (error == ENOENT) 860 ip6s = (pr_flags & PR_IP6_DISABLE) ? 0 : -1; 861 else if (error != 0) 862 goto done_free; 863 else if (ip6s & (sizeof(*ip6) - 1)) { 864 error = EINVAL; 865 goto done_free; 866 } else { 867 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE; 868 if (ip6s == 0) 869 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE; 870 else { 871 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER; 872 ip6s /= sizeof(*ip6); 873 if (ip6s > jail_max_af_ips) { 874 error = EINVAL; 875 vfs_opterror(opts, "too many IPv6 addresses"); 876 goto done_errmsg; 877 } 878 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 879 bcopy(op, ip6, ip6s * sizeof(*ip6)); 880 if (ip6s > 1) 881 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6); 882 for (ii = 0; ii < ip6s; ii++) { 883 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 884 error = EINVAL; 885 goto done_free; 886 } 887 if ((ii+1) < ip6s && 888 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 889 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 890 { 891 error = EINVAL; 892 goto done_free; 893 } 894 } 895 } 896 } 897 #endif 898 899 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 900 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 901 error = EINVAL; 902 vfs_opterror(opts, 903 "vnet jails cannot have IP address restrictions"); 904 goto done_errmsg; 905 } 906 #endif 907 908 fullpath_disabled = 0; 909 root = NULL; 910 error = vfs_getopt(opts, "path", (void **)&path, &len); 911 if (error == ENOENT) 912 path = NULL; 913 else if (error != 0) 914 goto done_free; 915 else { 916 if (flags & JAIL_UPDATE) { 917 error = EINVAL; 918 vfs_opterror(opts, 919 "path cannot be changed after creation"); 920 goto done_errmsg; 921 } 922 if (len == 0 || path[len - 1] != '\0') { 923 error = EINVAL; 924 goto done_free; 925 } 926 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 927 path, td); 928 error = namei(&nd); 929 if (error) 930 goto done_free; 931 root = nd.ni_vp; 932 NDFREE(&nd, NDF_ONLY_PNBUF); 933 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 934 strlcpy(g_path, path, MAXPATHLEN); 935 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 936 if (error == 0) 937 path = g_path; 938 else if (error == ENODEV) { 939 /* proceed if sysctl debug.disablefullpath == 1 */ 940 fullpath_disabled = 1; 941 if (len < 2 || (len == 2 && path[0] == '/')) 942 path = NULL; 943 } else { 944 /* exit on other errors */ 945 goto done_free; 946 } 947 if (root->v_type != VDIR) { 948 error = ENOTDIR; 949 vput(root); 950 goto done_free; 951 } 952 VOP_UNLOCK(root, 0); 953 if (fullpath_disabled) { 954 /* Leave room for a real-root full pathname. */ 955 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 956 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 957 error = ENAMETOOLONG; 958 goto done_free; 959 } 960 } 961 } 962 963 /* 964 * Grab the allprison lock before letting modules check their 965 * parameters. Once we have it, do not let go so we'll have a 966 * consistent view of the OSD list. 967 */ 968 sx_xlock(&allprison_lock); 969 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts); 970 if (error) 971 goto done_unlock_list; 972 973 /* By now, all parameters should have been noted. */ 974 TAILQ_FOREACH(opt, opts, link) { 975 if (!opt->seen && strcmp(opt->name, "errmsg")) { 976 error = EINVAL; 977 vfs_opterror(opts, "unknown parameter: %s", opt->name); 978 goto done_unlock_list; 979 } 980 } 981 982 /* 983 * See if we are creating a new record or updating an existing one. 984 * This abuses the file error codes ENOENT and EEXIST. 985 */ 986 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 987 if (!cuflags) { 988 error = EINVAL; 989 vfs_opterror(opts, "no valid operation (create or update)"); 990 goto done_unlock_list; 991 } 992 pr = NULL; 993 namelc = NULL; 994 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 995 namelc = strrchr(name, '.'); 996 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 997 if (*p != '\0') 998 jid = 0; 999 } 1000 if (jid != 0) { 1001 /* 1002 * See if a requested jid already exists. There is an 1003 * information leak here if the jid exists but is not within 1004 * the caller's jail hierarchy. Jail creators will get EEXIST 1005 * even though they cannot see the jail, and CREATE | UPDATE 1006 * will return ENOENT which is not normally a valid error. 1007 */ 1008 if (jid < 0) { 1009 error = EINVAL; 1010 vfs_opterror(opts, "negative jid"); 1011 goto done_unlock_list; 1012 } 1013 pr = prison_find(jid); 1014 if (pr != NULL) { 1015 ppr = pr->pr_parent; 1016 /* Create: jid must not exist. */ 1017 if (cuflags == JAIL_CREATE) { 1018 mtx_unlock(&pr->pr_mtx); 1019 error = EEXIST; 1020 vfs_opterror(opts, "jail %d already exists", 1021 jid); 1022 goto done_unlock_list; 1023 } 1024 if (!prison_ischild(mypr, pr)) { 1025 mtx_unlock(&pr->pr_mtx); 1026 pr = NULL; 1027 } else if (pr->pr_uref == 0) { 1028 if (!(flags & JAIL_DYING)) { 1029 mtx_unlock(&pr->pr_mtx); 1030 error = ENOENT; 1031 vfs_opterror(opts, "jail %d is dying", 1032 jid); 1033 goto done_unlock_list; 1034 } else if ((flags & JAIL_ATTACH) || 1035 (pr_flags & PR_PERSIST)) { 1036 /* 1037 * A dying jail might be resurrected 1038 * (via attach or persist), but first 1039 * it must determine if another jail 1040 * has claimed its name. Accomplish 1041 * this by implicitly re-setting the 1042 * name. 1043 */ 1044 if (name == NULL) 1045 name = prison_name(mypr, pr); 1046 } 1047 } 1048 } 1049 if (pr == NULL) { 1050 /* Update: jid must exist. */ 1051 if (cuflags == JAIL_UPDATE) { 1052 error = ENOENT; 1053 vfs_opterror(opts, "jail %d not found", jid); 1054 goto done_unlock_list; 1055 } 1056 } 1057 } 1058 /* 1059 * If the caller provided a name, look for a jail by that name. 1060 * This has different semantics for creates and updates keyed by jid 1061 * (where the name must not already exist in a different jail), 1062 * and updates keyed by the name itself (where the name must exist 1063 * because that is the jail being updated). 1064 */ 1065 if (name != NULL) { 1066 namelc = strrchr(name, '.'); 1067 if (namelc == NULL) 1068 namelc = name; 1069 else { 1070 /* 1071 * This is a hierarchical name. Split it into the 1072 * parent and child names, and make sure the parent 1073 * exists or matches an already found jail. 1074 */ 1075 *namelc = '\0'; 1076 if (pr != NULL) { 1077 if (strncmp(name, ppr->pr_name, namelc - name) 1078 || ppr->pr_name[namelc - name] != '\0') { 1079 mtx_unlock(&pr->pr_mtx); 1080 error = EINVAL; 1081 vfs_opterror(opts, 1082 "cannot change jail's parent"); 1083 goto done_unlock_list; 1084 } 1085 } else { 1086 ppr = prison_find_name(mypr, name); 1087 if (ppr == NULL) { 1088 error = ENOENT; 1089 vfs_opterror(opts, 1090 "jail \"%s\" not found", name); 1091 goto done_unlock_list; 1092 } 1093 mtx_unlock(&ppr->pr_mtx); 1094 } 1095 name = ++namelc; 1096 } 1097 if (name[0] != '\0') { 1098 namelen = 1099 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1100 name_again: 1101 deadpr = NULL; 1102 FOREACH_PRISON_CHILD(ppr, tpr) { 1103 if (tpr != pr && tpr->pr_ref > 0 && 1104 !strcmp(tpr->pr_name + namelen, name)) { 1105 if (pr == NULL && 1106 cuflags != JAIL_CREATE) { 1107 mtx_lock(&tpr->pr_mtx); 1108 if (tpr->pr_ref > 0) { 1109 /* 1110 * Use this jail 1111 * for updates. 1112 */ 1113 if (tpr->pr_uref > 0) { 1114 pr = tpr; 1115 break; 1116 } 1117 deadpr = tpr; 1118 } 1119 mtx_unlock(&tpr->pr_mtx); 1120 } else if (tpr->pr_uref > 0) { 1121 /* 1122 * Create, or update(jid): 1123 * name must not exist in an 1124 * active sibling jail. 1125 */ 1126 error = EEXIST; 1127 if (pr != NULL) 1128 mtx_unlock(&pr->pr_mtx); 1129 vfs_opterror(opts, 1130 "jail \"%s\" already exists", 1131 name); 1132 goto done_unlock_list; 1133 } 1134 } 1135 } 1136 /* If no active jail is found, use a dying one. */ 1137 if (deadpr != NULL && pr == NULL) { 1138 if (flags & JAIL_DYING) { 1139 mtx_lock(&deadpr->pr_mtx); 1140 if (deadpr->pr_ref == 0) { 1141 mtx_unlock(&deadpr->pr_mtx); 1142 goto name_again; 1143 } 1144 pr = deadpr; 1145 } else if (cuflags == JAIL_UPDATE) { 1146 error = ENOENT; 1147 vfs_opterror(opts, 1148 "jail \"%s\" is dying", name); 1149 goto done_unlock_list; 1150 } 1151 } 1152 /* Update: name must exist if no jid. */ 1153 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1154 error = ENOENT; 1155 vfs_opterror(opts, "jail \"%s\" not found", 1156 name); 1157 goto done_unlock_list; 1158 } 1159 } 1160 } 1161 /* Update: must provide a jid or name. */ 1162 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1163 error = ENOENT; 1164 vfs_opterror(opts, "update specified no jail"); 1165 goto done_unlock_list; 1166 } 1167 1168 /* If there's no prison to update, create a new one and link it in. */ 1169 if (pr == NULL) { 1170 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1171 if (tpr->pr_childcount >= tpr->pr_childmax) { 1172 error = EPERM; 1173 vfs_opterror(opts, "prison limit exceeded"); 1174 goto done_unlock_list; 1175 } 1176 created = 1; 1177 mtx_lock(&ppr->pr_mtx); 1178 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) { 1179 mtx_unlock(&ppr->pr_mtx); 1180 error = ENOENT; 1181 vfs_opterror(opts, "parent jail went away!"); 1182 goto done_unlock_list; 1183 } 1184 ppr->pr_ref++; 1185 ppr->pr_uref++; 1186 mtx_unlock(&ppr->pr_mtx); 1187 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1188 if (jid == 0) { 1189 /* Find the next free jid. */ 1190 jid = lastprid + 1; 1191 findnext: 1192 if (jid == JAIL_MAX) 1193 jid = 1; 1194 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1195 if (tpr->pr_id < jid) 1196 continue; 1197 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1198 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1199 break; 1200 } 1201 if (jid == lastprid) { 1202 error = EAGAIN; 1203 vfs_opterror(opts, 1204 "no available jail IDs"); 1205 free(pr, M_PRISON); 1206 prison_deref(ppr, PD_DEREF | 1207 PD_DEUREF | PD_LIST_XLOCKED); 1208 goto done_releroot; 1209 } 1210 jid++; 1211 goto findnext; 1212 } 1213 lastprid = jid; 1214 } else { 1215 /* 1216 * The jail already has a jid (that did not yet exist), 1217 * so just find where to insert it. 1218 */ 1219 TAILQ_FOREACH(tpr, &allprison, pr_list) 1220 if (tpr->pr_id >= jid) { 1221 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1222 break; 1223 } 1224 } 1225 if (tpr == NULL) 1226 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1227 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1228 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1229 tpr->pr_childcount++; 1230 1231 pr->pr_parent = ppr; 1232 pr->pr_id = jid; 1233 1234 /* Set some default values, and inherit some from the parent. */ 1235 if (name == NULL) 1236 name = ""; 1237 if (path == NULL) { 1238 path = "/"; 1239 root = mypr->pr_root; 1240 vref(root); 1241 } 1242 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1243 pr->pr_flags |= PR_HOST; 1244 #if defined(INET) || defined(INET6) 1245 #ifdef VIMAGE 1246 if (!(pr_flags & PR_VNET)) 1247 #endif 1248 { 1249 #ifdef INET 1250 if (!(ch_flags & PR_IP4_USER)) 1251 pr->pr_flags |= 1252 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE; 1253 else if (!(pr_flags & PR_IP4_USER)) { 1254 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1255 if (ppr->pr_ip4 != NULL) { 1256 pr->pr_ip4s = ppr->pr_ip4s; 1257 pr->pr_ip4 = malloc(pr->pr_ip4s * 1258 sizeof(struct in_addr), M_PRISON, 1259 M_WAITOK); 1260 bcopy(ppr->pr_ip4, pr->pr_ip4, 1261 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1262 } 1263 } 1264 #endif 1265 #ifdef INET6 1266 if (!(ch_flags & PR_IP6_USER)) 1267 pr->pr_flags |= 1268 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE; 1269 else if (!(pr_flags & PR_IP6_USER)) { 1270 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1271 if (ppr->pr_ip6 != NULL) { 1272 pr->pr_ip6s = ppr->pr_ip6s; 1273 pr->pr_ip6 = malloc(pr->pr_ip6s * 1274 sizeof(struct in6_addr), M_PRISON, 1275 M_WAITOK); 1276 bcopy(ppr->pr_ip6, pr->pr_ip6, 1277 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1278 } 1279 } 1280 #endif 1281 } 1282 #endif 1283 /* Source address selection is always on by default. */ 1284 pr->pr_flags |= _PR_IP_SADDRSEL; 1285 1286 pr->pr_securelevel = ppr->pr_securelevel; 1287 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1288 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 1289 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1290 1291 LIST_INIT(&pr->pr_children); 1292 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1293 1294 #ifdef VIMAGE 1295 /* Allocate a new vnet if specified. */ 1296 pr->pr_vnet = (pr_flags & PR_VNET) 1297 ? vnet_alloc() : ppr->pr_vnet; 1298 #endif 1299 /* 1300 * Allocate a dedicated cpuset for each jail. 1301 * Unlike other initial settings, this may return an erorr. 1302 */ 1303 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1304 if (error) { 1305 prison_deref(pr, PD_LIST_XLOCKED); 1306 goto done_releroot; 1307 } 1308 1309 mtx_lock(&pr->pr_mtx); 1310 /* 1311 * New prisons do not yet have a reference, because we do not 1312 * want other to see the incomplete prison once the 1313 * allprison_lock is downgraded. 1314 */ 1315 } else { 1316 created = 0; 1317 /* 1318 * Grab a reference for existing prisons, to ensure they 1319 * continue to exist for the duration of the call. 1320 */ 1321 pr->pr_ref++; 1322 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1323 if ((pr->pr_flags & PR_VNET) && 1324 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1325 error = EINVAL; 1326 vfs_opterror(opts, 1327 "vnet jails cannot have IP address restrictions"); 1328 goto done_deref_locked; 1329 } 1330 #endif 1331 #ifdef INET 1332 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1333 error = EINVAL; 1334 vfs_opterror(opts, 1335 "ip4 cannot be changed after creation"); 1336 goto done_deref_locked; 1337 } 1338 #endif 1339 #ifdef INET6 1340 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1341 error = EINVAL; 1342 vfs_opterror(opts, 1343 "ip6 cannot be changed after creation"); 1344 goto done_deref_locked; 1345 } 1346 #endif 1347 } 1348 1349 /* Do final error checking before setting anything. */ 1350 if (gotslevel) { 1351 if (slevel < ppr->pr_securelevel) { 1352 error = EPERM; 1353 goto done_deref_locked; 1354 } 1355 } 1356 if (gotchildmax) { 1357 if (childmax >= ppr->pr_childmax) { 1358 error = EPERM; 1359 goto done_deref_locked; 1360 } 1361 } 1362 if (gotenforce) { 1363 if (enforce < ppr->pr_enforce_statfs) { 1364 error = EPERM; 1365 goto done_deref_locked; 1366 } 1367 } 1368 if (gotrsnum) { 1369 /* 1370 * devfs_rsnum is a uint16_t 1371 */ 1372 if (rsnum < 0 || rsnum > 65535) { 1373 error = EINVAL; 1374 goto done_deref_locked; 1375 } 1376 /* 1377 * Nested jails always inherit parent's devfs ruleset 1378 */ 1379 if (jailed(td->td_ucred)) { 1380 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1381 error = EPERM; 1382 goto done_deref_locked; 1383 } else 1384 rsnum = ppr->pr_devfs_rsnum; 1385 } 1386 } 1387 #ifdef INET 1388 if (ip4s > 0) { 1389 if (ppr->pr_flags & PR_IP4) { 1390 /* 1391 * Make sure the new set of IP addresses is a 1392 * subset of the parent's list. Don't worry 1393 * about the parent being unlocked, as any 1394 * setting is done with allprison_lock held. 1395 */ 1396 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1397 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1398 break; 1399 if (ij == ppr->pr_ip4s) { 1400 error = EPERM; 1401 goto done_deref_locked; 1402 } 1403 if (ip4s > 1) { 1404 for (ii = ij = 1; ii < ip4s; ii++) { 1405 if (ip4[ii].s_addr == 1406 ppr->pr_ip4[0].s_addr) 1407 continue; 1408 for (; ij < ppr->pr_ip4s; ij++) 1409 if (ip4[ii].s_addr == 1410 ppr->pr_ip4[ij].s_addr) 1411 break; 1412 if (ij == ppr->pr_ip4s) 1413 break; 1414 } 1415 if (ij == ppr->pr_ip4s) { 1416 error = EPERM; 1417 goto done_deref_locked; 1418 } 1419 } 1420 } 1421 /* 1422 * Check for conflicting IP addresses. We permit them 1423 * if there is no more than one IP on each jail. If 1424 * there is a duplicate on a jail with more than one 1425 * IP stop checking and return error. 1426 */ 1427 tppr = ppr; 1428 #ifdef VIMAGE 1429 for (; tppr != &prison0; tppr = tppr->pr_parent) 1430 if (tppr->pr_flags & PR_VNET) 1431 break; 1432 #endif 1433 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1434 if (tpr == pr || 1435 #ifdef VIMAGE 1436 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1437 #endif 1438 tpr->pr_uref == 0) { 1439 descend = 0; 1440 continue; 1441 } 1442 if (!(tpr->pr_flags & PR_IP4_USER)) 1443 continue; 1444 descend = 0; 1445 if (tpr->pr_ip4 == NULL || 1446 (ip4s == 1 && tpr->pr_ip4s == 1)) 1447 continue; 1448 for (ii = 0; ii < ip4s; ii++) { 1449 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1450 error = EADDRINUSE; 1451 vfs_opterror(opts, 1452 "IPv4 addresses clash"); 1453 goto done_deref_locked; 1454 } 1455 } 1456 } 1457 } 1458 #endif 1459 #ifdef INET6 1460 if (ip6s > 0) { 1461 if (ppr->pr_flags & PR_IP6) { 1462 /* 1463 * Make sure the new set of IP addresses is a 1464 * subset of the parent's list. 1465 */ 1466 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1467 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1468 &ppr->pr_ip6[ij])) 1469 break; 1470 if (ij == ppr->pr_ip6s) { 1471 error = EPERM; 1472 goto done_deref_locked; 1473 } 1474 if (ip6s > 1) { 1475 for (ii = ij = 1; ii < ip6s; ii++) { 1476 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1477 &ppr->pr_ip6[0])) 1478 continue; 1479 for (; ij < ppr->pr_ip6s; ij++) 1480 if (IN6_ARE_ADDR_EQUAL( 1481 &ip6[ii], &ppr->pr_ip6[ij])) 1482 break; 1483 if (ij == ppr->pr_ip6s) 1484 break; 1485 } 1486 if (ij == ppr->pr_ip6s) { 1487 error = EPERM; 1488 goto done_deref_locked; 1489 } 1490 } 1491 } 1492 /* Check for conflicting IP addresses. */ 1493 tppr = ppr; 1494 #ifdef VIMAGE 1495 for (; tppr != &prison0; tppr = tppr->pr_parent) 1496 if (tppr->pr_flags & PR_VNET) 1497 break; 1498 #endif 1499 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1500 if (tpr == pr || 1501 #ifdef VIMAGE 1502 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1503 #endif 1504 tpr->pr_uref == 0) { 1505 descend = 0; 1506 continue; 1507 } 1508 if (!(tpr->pr_flags & PR_IP6_USER)) 1509 continue; 1510 descend = 0; 1511 if (tpr->pr_ip6 == NULL || 1512 (ip6s == 1 && tpr->pr_ip6s == 1)) 1513 continue; 1514 for (ii = 0; ii < ip6s; ii++) { 1515 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1516 error = EADDRINUSE; 1517 vfs_opterror(opts, 1518 "IPv6 addresses clash"); 1519 goto done_deref_locked; 1520 } 1521 } 1522 } 1523 } 1524 #endif 1525 onamelen = namelen = 0; 1526 if (name != NULL) { 1527 /* Give a default name of the jid. */ 1528 if (name[0] == '\0') 1529 snprintf(name = numbuf, sizeof(numbuf), "%d", jid); 1530 else if (*namelc == '' || (strtoul(namelc, &p, 10) != jid && 1531 *p == '\0')) { 1532 error = EINVAL; 1533 vfs_opterror(opts, 1534 "name cannot be numeric (unless it is the jid)"); 1535 goto done_deref_locked; 1536 } 1537 /* 1538 * Make sure the name isn't too long for the prison or its 1539 * children. 1540 */ 1541 onamelen = strlen(pr->pr_name); 1542 namelen = strlen(name); 1543 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) { 1544 error = ENAMETOOLONG; 1545 goto done_deref_locked; 1546 } 1547 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1548 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1549 sizeof(pr->pr_name)) { 1550 error = ENAMETOOLONG; 1551 goto done_deref_locked; 1552 } 1553 } 1554 } 1555 if (pr_allow & ~ppr->pr_allow) { 1556 error = EPERM; 1557 goto done_deref_locked; 1558 } 1559 1560 /* Set the parameters of the prison. */ 1561 #ifdef INET 1562 redo_ip4 = 0; 1563 if (pr_flags & PR_IP4_USER) { 1564 pr->pr_flags |= PR_IP4; 1565 free(pr->pr_ip4, M_PRISON); 1566 pr->pr_ip4s = ip4s; 1567 pr->pr_ip4 = ip4; 1568 ip4 = NULL; 1569 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1570 #ifdef VIMAGE 1571 if (tpr->pr_flags & PR_VNET) { 1572 descend = 0; 1573 continue; 1574 } 1575 #endif 1576 if (prison_restrict_ip4(tpr, NULL)) { 1577 redo_ip4 = 1; 1578 descend = 0; 1579 } 1580 } 1581 } 1582 #endif 1583 #ifdef INET6 1584 redo_ip6 = 0; 1585 if (pr_flags & PR_IP6_USER) { 1586 pr->pr_flags |= PR_IP6; 1587 free(pr->pr_ip6, M_PRISON); 1588 pr->pr_ip6s = ip6s; 1589 pr->pr_ip6 = ip6; 1590 ip6 = NULL; 1591 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1592 #ifdef VIMAGE 1593 if (tpr->pr_flags & PR_VNET) { 1594 descend = 0; 1595 continue; 1596 } 1597 #endif 1598 if (prison_restrict_ip6(tpr, NULL)) { 1599 redo_ip6 = 1; 1600 descend = 0; 1601 } 1602 } 1603 } 1604 #endif 1605 if (gotslevel) { 1606 pr->pr_securelevel = slevel; 1607 /* Set all child jails to be at least this level. */ 1608 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1609 if (tpr->pr_securelevel < slevel) 1610 tpr->pr_securelevel = slevel; 1611 } 1612 if (gotchildmax) { 1613 pr->pr_childmax = childmax; 1614 /* Set all child jails to under this limit. */ 1615 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1616 if (tpr->pr_childmax > childmax - level) 1617 tpr->pr_childmax = childmax > level 1618 ? childmax - level : 0; 1619 } 1620 if (gotenforce) { 1621 pr->pr_enforce_statfs = enforce; 1622 /* Pass this restriction on to the children. */ 1623 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1624 if (tpr->pr_enforce_statfs < enforce) 1625 tpr->pr_enforce_statfs = enforce; 1626 } 1627 if (gotrsnum) { 1628 pr->pr_devfs_rsnum = rsnum; 1629 /* Pass this restriction on to the children. */ 1630 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1631 tpr->pr_devfs_rsnum = rsnum; 1632 } 1633 if (name != NULL) { 1634 if (ppr == &prison0) 1635 strlcpy(pr->pr_name, name, sizeof(pr->pr_name)); 1636 else 1637 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1638 ppr->pr_name, name); 1639 /* Change this component of child names. */ 1640 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1641 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1642 strlen(tpr->pr_name + onamelen) + 1); 1643 bcopy(pr->pr_name, tpr->pr_name, namelen); 1644 } 1645 } 1646 if (path != NULL) { 1647 /* Try to keep a real-rooted full pathname. */ 1648 if (fullpath_disabled && path[0] == '/' && 1649 strcmp(mypr->pr_path, "/")) 1650 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1651 mypr->pr_path, path); 1652 else 1653 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1654 pr->pr_root = root; 1655 } 1656 if (PR_HOST & ch_flags & ~pr_flags) { 1657 if (pr->pr_flags & PR_HOST) { 1658 /* 1659 * Copy the parent's host info. As with pr_ip4 above, 1660 * the lack of a lock on the parent is not a problem; 1661 * it is always set with allprison_lock at least 1662 * shared, and is held exclusively here. 1663 */ 1664 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1665 sizeof(pr->pr_hostname)); 1666 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1667 sizeof(pr->pr_domainname)); 1668 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1669 sizeof(pr->pr_hostuuid)); 1670 pr->pr_hostid = pr->pr_parent->pr_hostid; 1671 } 1672 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1673 /* Set this prison, and any descendants without PR_HOST. */ 1674 if (host != NULL) 1675 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1676 if (domain != NULL) 1677 strlcpy(pr->pr_domainname, domain, 1678 sizeof(pr->pr_domainname)); 1679 if (uuid != NULL) 1680 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1681 if (gothid) 1682 pr->pr_hostid = hid; 1683 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1684 if (tpr->pr_flags & PR_HOST) 1685 descend = 0; 1686 else { 1687 if (host != NULL) 1688 strlcpy(tpr->pr_hostname, 1689 pr->pr_hostname, 1690 sizeof(tpr->pr_hostname)); 1691 if (domain != NULL) 1692 strlcpy(tpr->pr_domainname, 1693 pr->pr_domainname, 1694 sizeof(tpr->pr_domainname)); 1695 if (uuid != NULL) 1696 strlcpy(tpr->pr_hostuuid, 1697 pr->pr_hostuuid, 1698 sizeof(tpr->pr_hostuuid)); 1699 if (gothid) 1700 tpr->pr_hostid = hid; 1701 } 1702 } 1703 } 1704 if ((tallow = ch_allow & ~pr_allow)) { 1705 /* Clear allow bits in all children. */ 1706 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1707 tpr->pr_allow &= ~tallow; 1708 } 1709 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1710 /* 1711 * Persistent prisons get an extra reference, and prisons losing their 1712 * persist flag lose that reference. Only do this for existing prisons 1713 * for now, so new ones will remain unseen until after the module 1714 * handlers have completed. 1715 */ 1716 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1717 if (pr_flags & PR_PERSIST) { 1718 pr->pr_ref++; 1719 pr->pr_uref++; 1720 } else { 1721 pr->pr_ref--; 1722 pr->pr_uref--; 1723 } 1724 } 1725 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1726 mtx_unlock(&pr->pr_mtx); 1727 1728 #ifdef RACCT 1729 if (created) 1730 prison_racct_attach(pr); 1731 #endif 1732 1733 /* Locks may have prevented a complete restriction of child IP 1734 * addresses. If so, allocate some more memory and try again. 1735 */ 1736 #ifdef INET 1737 while (redo_ip4) { 1738 ip4s = pr->pr_ip4s; 1739 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1740 mtx_lock(&pr->pr_mtx); 1741 redo_ip4 = 0; 1742 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1743 #ifdef VIMAGE 1744 if (tpr->pr_flags & PR_VNET) { 1745 descend = 0; 1746 continue; 1747 } 1748 #endif 1749 if (prison_restrict_ip4(tpr, ip4)) { 1750 if (ip4 != NULL) 1751 ip4 = NULL; 1752 else 1753 redo_ip4 = 1; 1754 } 1755 } 1756 mtx_unlock(&pr->pr_mtx); 1757 } 1758 #endif 1759 #ifdef INET6 1760 while (redo_ip6) { 1761 ip6s = pr->pr_ip6s; 1762 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1763 mtx_lock(&pr->pr_mtx); 1764 redo_ip6 = 0; 1765 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1766 #ifdef VIMAGE 1767 if (tpr->pr_flags & PR_VNET) { 1768 descend = 0; 1769 continue; 1770 } 1771 #endif 1772 if (prison_restrict_ip6(tpr, ip6)) { 1773 if (ip6 != NULL) 1774 ip6 = NULL; 1775 else 1776 redo_ip6 = 1; 1777 } 1778 } 1779 mtx_unlock(&pr->pr_mtx); 1780 } 1781 #endif 1782 1783 /* Let the modules do their work. */ 1784 sx_downgrade(&allprison_lock); 1785 if (created) { 1786 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1787 if (error) { 1788 prison_deref(pr, PD_LIST_SLOCKED); 1789 goto done_errmsg; 1790 } 1791 } 1792 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1793 if (error) { 1794 prison_deref(pr, created 1795 ? PD_LIST_SLOCKED 1796 : PD_DEREF | PD_LIST_SLOCKED); 1797 goto done_errmsg; 1798 } 1799 1800 /* Attach this process to the prison if requested. */ 1801 if (flags & JAIL_ATTACH) { 1802 mtx_lock(&pr->pr_mtx); 1803 error = do_jail_attach(td, pr); 1804 if (error) { 1805 vfs_opterror(opts, "attach failed"); 1806 if (!created) 1807 prison_deref(pr, PD_DEREF); 1808 goto done_errmsg; 1809 } 1810 } 1811 1812 #ifdef RACCT 1813 if (!created) { 1814 if (!(flags & JAIL_ATTACH)) 1815 sx_sunlock(&allprison_lock); 1816 prison_racct_modify(pr); 1817 if (!(flags & JAIL_ATTACH)) 1818 sx_slock(&allprison_lock); 1819 } 1820 #endif 1821 1822 td->td_retval[0] = pr->pr_id; 1823 1824 /* 1825 * Now that it is all there, drop the temporary reference from existing 1826 * prisons. Or add a reference to newly created persistent prisons 1827 * (which was not done earlier so that the prison would not be publicly 1828 * visible). 1829 */ 1830 if (!created) { 1831 prison_deref(pr, (flags & JAIL_ATTACH) 1832 ? PD_DEREF 1833 : PD_DEREF | PD_LIST_SLOCKED); 1834 } else { 1835 if (pr_flags & PR_PERSIST) { 1836 mtx_lock(&pr->pr_mtx); 1837 pr->pr_ref++; 1838 pr->pr_uref++; 1839 mtx_unlock(&pr->pr_mtx); 1840 } 1841 if (!(flags & JAIL_ATTACH)) 1842 sx_sunlock(&allprison_lock); 1843 } 1844 1845 goto done_errmsg; 1846 1847 done_deref_locked: 1848 prison_deref(pr, created 1849 ? PD_LOCKED | PD_LIST_XLOCKED 1850 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1851 goto done_releroot; 1852 done_unlock_list: 1853 sx_xunlock(&allprison_lock); 1854 done_releroot: 1855 if (root != NULL) 1856 vrele(root); 1857 done_errmsg: 1858 if (error) { 1859 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 1860 if (errmsg_len > 0) { 1861 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1862 if (errmsg_pos > 0) { 1863 if (optuio->uio_segflg == UIO_SYSSPACE) 1864 bcopy(errmsg, 1865 optuio->uio_iov[errmsg_pos].iov_base, 1866 errmsg_len); 1867 else 1868 copyout(errmsg, 1869 optuio->uio_iov[errmsg_pos].iov_base, 1870 errmsg_len); 1871 } 1872 } 1873 } 1874 done_free: 1875 #ifdef INET 1876 free(ip4, M_PRISON); 1877 #endif 1878 #ifdef INET6 1879 free(ip6, M_PRISON); 1880 #endif 1881 if (g_path != NULL) 1882 free(g_path, M_TEMP); 1883 vfs_freeopts(opts); 1884 return (error); 1885 } 1886 1887 1888 /* 1889 * struct jail_get_args { 1890 * struct iovec *iovp; 1891 * unsigned int iovcnt; 1892 * int flags; 1893 * }; 1894 */ 1895 int 1896 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1897 { 1898 struct uio *auio; 1899 int error; 1900 1901 /* Check that we have an even number of iovecs. */ 1902 if (uap->iovcnt & 1) 1903 return (EINVAL); 1904 1905 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1906 if (error) 1907 return (error); 1908 error = kern_jail_get(td, auio, uap->flags); 1909 if (error == 0) 1910 error = copyout(auio->uio_iov, uap->iovp, 1911 uap->iovcnt * sizeof (struct iovec)); 1912 free(auio, M_IOV); 1913 return (error); 1914 } 1915 1916 int 1917 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1918 { 1919 struct prison *pr, *mypr; 1920 struct vfsopt *opt; 1921 struct vfsoptlist *opts; 1922 char *errmsg, *name; 1923 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1924 1925 if (flags & ~JAIL_GET_MASK) 1926 return (EINVAL); 1927 1928 /* Get the parameter list. */ 1929 error = vfs_buildopts(optuio, &opts); 1930 if (error) 1931 return (error); 1932 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1933 mypr = td->td_ucred->cr_prison; 1934 1935 /* 1936 * Find the prison specified by one of: lastjid, jid, name. 1937 */ 1938 sx_slock(&allprison_lock); 1939 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1940 if (error == 0) { 1941 TAILQ_FOREACH(pr, &allprison, pr_list) { 1942 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1943 mtx_lock(&pr->pr_mtx); 1944 if (pr->pr_ref > 0 && 1945 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1946 break; 1947 mtx_unlock(&pr->pr_mtx); 1948 } 1949 } 1950 if (pr != NULL) 1951 goto found_prison; 1952 error = ENOENT; 1953 vfs_opterror(opts, "no jail after %d", jid); 1954 goto done_unlock_list; 1955 } else if (error != ENOENT) 1956 goto done_unlock_list; 1957 1958 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1959 if (error == 0) { 1960 if (jid != 0) { 1961 pr = prison_find_child(mypr, jid); 1962 if (pr != NULL) { 1963 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1964 mtx_unlock(&pr->pr_mtx); 1965 error = ENOENT; 1966 vfs_opterror(opts, "jail %d is dying", 1967 jid); 1968 goto done_unlock_list; 1969 } 1970 goto found_prison; 1971 } 1972 error = ENOENT; 1973 vfs_opterror(opts, "jail %d not found", jid); 1974 goto done_unlock_list; 1975 } 1976 } else if (error != ENOENT) 1977 goto done_unlock_list; 1978 1979 error = vfs_getopt(opts, "name", (void **)&name, &len); 1980 if (error == 0) { 1981 if (len == 0 || name[len - 1] != '\0') { 1982 error = EINVAL; 1983 goto done_unlock_list; 1984 } 1985 pr = prison_find_name(mypr, name); 1986 if (pr != NULL) { 1987 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1988 mtx_unlock(&pr->pr_mtx); 1989 error = ENOENT; 1990 vfs_opterror(opts, "jail \"%s\" is dying", 1991 name); 1992 goto done_unlock_list; 1993 } 1994 goto found_prison; 1995 } 1996 error = ENOENT; 1997 vfs_opterror(opts, "jail \"%s\" not found", name); 1998 goto done_unlock_list; 1999 } else if (error != ENOENT) 2000 goto done_unlock_list; 2001 2002 vfs_opterror(opts, "no jail specified"); 2003 error = ENOENT; 2004 goto done_unlock_list; 2005 2006 found_prison: 2007 /* Get the parameters of the prison. */ 2008 pr->pr_ref++; 2009 locked = PD_LOCKED; 2010 td->td_retval[0] = pr->pr_id; 2011 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2012 if (error != 0 && error != ENOENT) 2013 goto done_deref; 2014 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2015 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2016 if (error != 0 && error != ENOENT) 2017 goto done_deref; 2018 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2019 if (error != 0 && error != ENOENT) 2020 goto done_deref; 2021 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2022 sizeof(pr->pr_cpuset->cs_id)); 2023 if (error != 0 && error != ENOENT) 2024 goto done_deref; 2025 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2026 if (error != 0 && error != ENOENT) 2027 goto done_deref; 2028 #ifdef INET 2029 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2030 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2031 if (error != 0 && error != ENOENT) 2032 goto done_deref; 2033 #endif 2034 #ifdef INET6 2035 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2036 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2037 if (error != 0 && error != ENOENT) 2038 goto done_deref; 2039 #endif 2040 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2041 sizeof(pr->pr_securelevel)); 2042 if (error != 0 && error != ENOENT) 2043 goto done_deref; 2044 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2045 sizeof(pr->pr_childcount)); 2046 if (error != 0 && error != ENOENT) 2047 goto done_deref; 2048 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2049 sizeof(pr->pr_childmax)); 2050 if (error != 0 && error != ENOENT) 2051 goto done_deref; 2052 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2053 if (error != 0 && error != ENOENT) 2054 goto done_deref; 2055 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2056 if (error != 0 && error != ENOENT) 2057 goto done_deref; 2058 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2059 if (error != 0 && error != ENOENT) 2060 goto done_deref; 2061 #ifdef COMPAT_FREEBSD32 2062 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2063 uint32_t hid32 = pr->pr_hostid; 2064 2065 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2066 } else 2067 #endif 2068 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2069 sizeof(pr->pr_hostid)); 2070 if (error != 0 && error != ENOENT) 2071 goto done_deref; 2072 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2073 sizeof(pr->pr_enforce_statfs)); 2074 if (error != 0 && error != ENOENT) 2075 goto done_deref; 2076 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2077 sizeof(pr->pr_devfs_rsnum)); 2078 if (error != 0 && error != ENOENT) 2079 goto done_deref; 2080 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 2081 fi++) { 2082 if (pr_flag_names[fi] == NULL) 2083 continue; 2084 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 2085 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 2086 if (error != 0 && error != ENOENT) 2087 goto done_deref; 2088 i = !i; 2089 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 2090 if (error != 0 && error != ENOENT) 2091 goto done_deref; 2092 } 2093 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 2094 fi++) { 2095 i = pr->pr_flags & 2096 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2097 i = pr_flag_jailsys[fi].disable && 2098 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2099 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2100 : JAIL_SYS_INHERIT; 2101 error = 2102 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2103 if (error != 0 && error != ENOENT) 2104 goto done_deref; 2105 } 2106 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 2107 fi++) { 2108 if (pr_allow_names[fi] == NULL) 2109 continue; 2110 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2111 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2112 if (error != 0 && error != ENOENT) 2113 goto done_deref; 2114 i = !i; 2115 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2116 if (error != 0 && error != ENOENT) 2117 goto done_deref; 2118 } 2119 i = (pr->pr_uref == 0); 2120 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2121 if (error != 0 && error != ENOENT) 2122 goto done_deref; 2123 i = !i; 2124 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2125 if (error != 0 && error != ENOENT) 2126 goto done_deref; 2127 2128 /* Get the module parameters. */ 2129 mtx_unlock(&pr->pr_mtx); 2130 locked = 0; 2131 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2132 if (error) 2133 goto done_deref; 2134 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2135 2136 /* By now, all parameters should have been noted. */ 2137 TAILQ_FOREACH(opt, opts, link) { 2138 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2139 error = EINVAL; 2140 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2141 goto done_errmsg; 2142 } 2143 } 2144 2145 /* Write the fetched parameters back to userspace. */ 2146 error = 0; 2147 TAILQ_FOREACH(opt, opts, link) { 2148 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2149 pos = 2 * opt->pos + 1; 2150 optuio->uio_iov[pos].iov_len = opt->len; 2151 if (opt->value != NULL) { 2152 if (optuio->uio_segflg == UIO_SYSSPACE) { 2153 bcopy(opt->value, 2154 optuio->uio_iov[pos].iov_base, 2155 opt->len); 2156 } else { 2157 error = copyout(opt->value, 2158 optuio->uio_iov[pos].iov_base, 2159 opt->len); 2160 if (error) 2161 break; 2162 } 2163 } 2164 } 2165 } 2166 goto done_errmsg; 2167 2168 done_deref: 2169 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2170 goto done_errmsg; 2171 2172 done_unlock_list: 2173 sx_sunlock(&allprison_lock); 2174 done_errmsg: 2175 if (error && errmsg_pos >= 0) { 2176 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2177 errmsg_pos = 2 * errmsg_pos + 1; 2178 if (errmsg_len > 0) { 2179 if (optuio->uio_segflg == UIO_SYSSPACE) 2180 bcopy(errmsg, 2181 optuio->uio_iov[errmsg_pos].iov_base, 2182 errmsg_len); 2183 else 2184 copyout(errmsg, 2185 optuio->uio_iov[errmsg_pos].iov_base, 2186 errmsg_len); 2187 } 2188 } 2189 vfs_freeopts(opts); 2190 return (error); 2191 } 2192 2193 2194 /* 2195 * struct jail_remove_args { 2196 * int jid; 2197 * }; 2198 */ 2199 int 2200 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2201 { 2202 struct prison *pr, *cpr, *lpr, *tpr; 2203 int descend, error; 2204 2205 error = priv_check(td, PRIV_JAIL_REMOVE); 2206 if (error) 2207 return (error); 2208 2209 sx_xlock(&allprison_lock); 2210 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2211 if (pr == NULL) { 2212 sx_xunlock(&allprison_lock); 2213 return (EINVAL); 2214 } 2215 2216 /* Remove all descendants of this prison, then remove this prison. */ 2217 pr->pr_ref++; 2218 pr->pr_flags |= PR_REMOVE; 2219 if (!LIST_EMPTY(&pr->pr_children)) { 2220 mtx_unlock(&pr->pr_mtx); 2221 lpr = NULL; 2222 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2223 mtx_lock(&cpr->pr_mtx); 2224 if (cpr->pr_ref > 0) { 2225 tpr = cpr; 2226 cpr->pr_ref++; 2227 cpr->pr_flags |= PR_REMOVE; 2228 } else { 2229 /* Already removed - do not do it again. */ 2230 tpr = NULL; 2231 } 2232 mtx_unlock(&cpr->pr_mtx); 2233 if (lpr != NULL) { 2234 mtx_lock(&lpr->pr_mtx); 2235 prison_remove_one(lpr); 2236 sx_xlock(&allprison_lock); 2237 } 2238 lpr = tpr; 2239 } 2240 if (lpr != NULL) { 2241 mtx_lock(&lpr->pr_mtx); 2242 prison_remove_one(lpr); 2243 sx_xlock(&allprison_lock); 2244 } 2245 mtx_lock(&pr->pr_mtx); 2246 } 2247 prison_remove_one(pr); 2248 return (0); 2249 } 2250 2251 static void 2252 prison_remove_one(struct prison *pr) 2253 { 2254 struct proc *p; 2255 int deuref; 2256 2257 /* If the prison was persistent, it is not anymore. */ 2258 deuref = 0; 2259 if (pr->pr_flags & PR_PERSIST) { 2260 pr->pr_ref--; 2261 deuref = PD_DEUREF; 2262 pr->pr_flags &= ~PR_PERSIST; 2263 } 2264 2265 /* 2266 * jail_remove added a reference. If that's the only one, remove 2267 * the prison now. 2268 */ 2269 KASSERT(pr->pr_ref > 0, 2270 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2271 if (pr->pr_ref == 1) { 2272 prison_deref(pr, 2273 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2274 return; 2275 } 2276 2277 mtx_unlock(&pr->pr_mtx); 2278 sx_xunlock(&allprison_lock); 2279 /* 2280 * Kill all processes unfortunate enough to be attached to this prison. 2281 */ 2282 sx_slock(&allproc_lock); 2283 LIST_FOREACH(p, &allproc, p_list) { 2284 PROC_LOCK(p); 2285 if (p->p_state != PRS_NEW && p->p_ucred && 2286 p->p_ucred->cr_prison == pr) 2287 kern_psignal(p, SIGKILL); 2288 PROC_UNLOCK(p); 2289 } 2290 sx_sunlock(&allproc_lock); 2291 /* Remove the temporary reference added by jail_remove. */ 2292 prison_deref(pr, deuref | PD_DEREF); 2293 } 2294 2295 2296 /* 2297 * struct jail_attach_args { 2298 * int jid; 2299 * }; 2300 */ 2301 int 2302 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2303 { 2304 struct prison *pr; 2305 int error; 2306 2307 error = priv_check(td, PRIV_JAIL_ATTACH); 2308 if (error) 2309 return (error); 2310 2311 sx_slock(&allprison_lock); 2312 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2313 if (pr == NULL) { 2314 sx_sunlock(&allprison_lock); 2315 return (EINVAL); 2316 } 2317 2318 /* 2319 * Do not allow a process to attach to a prison that is not 2320 * considered to be "alive". 2321 */ 2322 if (pr->pr_uref == 0) { 2323 mtx_unlock(&pr->pr_mtx); 2324 sx_sunlock(&allprison_lock); 2325 return (EINVAL); 2326 } 2327 2328 return (do_jail_attach(td, pr)); 2329 } 2330 2331 static int 2332 do_jail_attach(struct thread *td, struct prison *pr) 2333 { 2334 struct prison *ppr; 2335 struct proc *p; 2336 struct ucred *newcred, *oldcred; 2337 int error; 2338 2339 /* 2340 * XXX: Note that there is a slight race here if two threads 2341 * in the same privileged process attempt to attach to two 2342 * different jails at the same time. It is important for 2343 * user processes not to do this, or they might end up with 2344 * a process root from one prison, but attached to the jail 2345 * of another. 2346 */ 2347 pr->pr_ref++; 2348 pr->pr_uref++; 2349 mtx_unlock(&pr->pr_mtx); 2350 2351 /* Let modules do whatever they need to prepare for attaching. */ 2352 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2353 if (error) { 2354 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2355 return (error); 2356 } 2357 sx_sunlock(&allprison_lock); 2358 2359 /* 2360 * Reparent the newly attached process to this jail. 2361 */ 2362 ppr = td->td_ucred->cr_prison; 2363 p = td->td_proc; 2364 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2365 if (error) 2366 goto e_revert_osd; 2367 2368 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2369 if ((error = change_dir(pr->pr_root, td)) != 0) 2370 goto e_unlock; 2371 #ifdef MAC 2372 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2373 goto e_unlock; 2374 #endif 2375 VOP_UNLOCK(pr->pr_root, 0); 2376 if ((error = change_root(pr->pr_root, td))) 2377 goto e_revert_osd; 2378 2379 newcred = crget(); 2380 PROC_LOCK(p); 2381 oldcred = p->p_ucred; 2382 setsugid(p); 2383 crcopy(newcred, oldcred); 2384 newcred->cr_prison = pr; 2385 p->p_ucred = newcred; 2386 PROC_UNLOCK(p); 2387 #ifdef RACCT 2388 racct_proc_ucred_changed(p, oldcred, newcred); 2389 #endif 2390 crfree(oldcred); 2391 prison_deref(ppr, PD_DEREF | PD_DEUREF); 2392 return (0); 2393 e_unlock: 2394 VOP_UNLOCK(pr->pr_root, 0); 2395 e_revert_osd: 2396 /* Tell modules this thread is still in its old jail after all. */ 2397 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td); 2398 prison_deref(pr, PD_DEREF | PD_DEUREF); 2399 return (error); 2400 } 2401 2402 2403 /* 2404 * Returns a locked prison instance, or NULL on failure. 2405 */ 2406 struct prison * 2407 prison_find(int prid) 2408 { 2409 struct prison *pr; 2410 2411 sx_assert(&allprison_lock, SX_LOCKED); 2412 TAILQ_FOREACH(pr, &allprison, pr_list) { 2413 if (pr->pr_id == prid) { 2414 mtx_lock(&pr->pr_mtx); 2415 if (pr->pr_ref > 0) 2416 return (pr); 2417 mtx_unlock(&pr->pr_mtx); 2418 } 2419 } 2420 return (NULL); 2421 } 2422 2423 /* 2424 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2425 */ 2426 struct prison * 2427 prison_find_child(struct prison *mypr, int prid) 2428 { 2429 struct prison *pr; 2430 int descend; 2431 2432 sx_assert(&allprison_lock, SX_LOCKED); 2433 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2434 if (pr->pr_id == prid) { 2435 mtx_lock(&pr->pr_mtx); 2436 if (pr->pr_ref > 0) 2437 return (pr); 2438 mtx_unlock(&pr->pr_mtx); 2439 } 2440 } 2441 return (NULL); 2442 } 2443 2444 /* 2445 * Look for the name relative to mypr. Returns a locked prison or NULL. 2446 */ 2447 struct prison * 2448 prison_find_name(struct prison *mypr, const char *name) 2449 { 2450 struct prison *pr, *deadpr; 2451 size_t mylen; 2452 int descend; 2453 2454 sx_assert(&allprison_lock, SX_LOCKED); 2455 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2456 again: 2457 deadpr = NULL; 2458 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2459 if (!strcmp(pr->pr_name + mylen, name)) { 2460 mtx_lock(&pr->pr_mtx); 2461 if (pr->pr_ref > 0) { 2462 if (pr->pr_uref > 0) 2463 return (pr); 2464 deadpr = pr; 2465 } 2466 mtx_unlock(&pr->pr_mtx); 2467 } 2468 } 2469 /* There was no valid prison - perhaps there was a dying one. */ 2470 if (deadpr != NULL) { 2471 mtx_lock(&deadpr->pr_mtx); 2472 if (deadpr->pr_ref == 0) { 2473 mtx_unlock(&deadpr->pr_mtx); 2474 goto again; 2475 } 2476 } 2477 return (deadpr); 2478 } 2479 2480 /* 2481 * See if a prison has the specific flag set. 2482 */ 2483 int 2484 prison_flag(struct ucred *cred, unsigned flag) 2485 { 2486 2487 /* This is an atomic read, so no locking is necessary. */ 2488 return (cred->cr_prison->pr_flags & flag); 2489 } 2490 2491 int 2492 prison_allow(struct ucred *cred, unsigned flag) 2493 { 2494 2495 /* This is an atomic read, so no locking is necessary. */ 2496 return (cred->cr_prison->pr_allow & flag); 2497 } 2498 2499 /* 2500 * Remove a prison reference. If that was the last reference, remove the 2501 * prison itself - but not in this context in case there are locks held. 2502 */ 2503 void 2504 prison_free_locked(struct prison *pr) 2505 { 2506 2507 mtx_assert(&pr->pr_mtx, MA_OWNED); 2508 pr->pr_ref--; 2509 if (pr->pr_ref == 0) { 2510 mtx_unlock(&pr->pr_mtx); 2511 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 2512 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2513 return; 2514 } 2515 mtx_unlock(&pr->pr_mtx); 2516 } 2517 2518 void 2519 prison_free(struct prison *pr) 2520 { 2521 2522 mtx_lock(&pr->pr_mtx); 2523 prison_free_locked(pr); 2524 } 2525 2526 static void 2527 prison_complete(void *context, int pending) 2528 { 2529 2530 prison_deref((struct prison *)context, 0); 2531 } 2532 2533 /* 2534 * Remove a prison reference (usually). This internal version assumes no 2535 * mutexes are held, except perhaps the prison itself. If there are no more 2536 * references, release and delist the prison. On completion, the prison lock 2537 * and the allprison lock are both unlocked. 2538 */ 2539 static void 2540 prison_deref(struct prison *pr, int flags) 2541 { 2542 struct prison *ppr, *tpr; 2543 2544 if (!(flags & PD_LOCKED)) 2545 mtx_lock(&pr->pr_mtx); 2546 for (;;) { 2547 if (flags & PD_DEUREF) { 2548 pr->pr_uref--; 2549 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2550 } 2551 if (flags & PD_DEREF) 2552 pr->pr_ref--; 2553 /* If the prison still has references, nothing else to do. */ 2554 if (pr->pr_ref > 0) { 2555 mtx_unlock(&pr->pr_mtx); 2556 if (flags & PD_LIST_SLOCKED) 2557 sx_sunlock(&allprison_lock); 2558 else if (flags & PD_LIST_XLOCKED) 2559 sx_xunlock(&allprison_lock); 2560 return; 2561 } 2562 2563 mtx_unlock(&pr->pr_mtx); 2564 if (flags & PD_LIST_SLOCKED) { 2565 if (!sx_try_upgrade(&allprison_lock)) { 2566 sx_sunlock(&allprison_lock); 2567 sx_xlock(&allprison_lock); 2568 } 2569 } else if (!(flags & PD_LIST_XLOCKED)) 2570 sx_xlock(&allprison_lock); 2571 2572 TAILQ_REMOVE(&allprison, pr, pr_list); 2573 LIST_REMOVE(pr, pr_sibling); 2574 ppr = pr->pr_parent; 2575 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2576 tpr->pr_childcount--; 2577 sx_xunlock(&allprison_lock); 2578 2579 #ifdef VIMAGE 2580 if (pr->pr_vnet != ppr->pr_vnet) 2581 vnet_destroy(pr->pr_vnet); 2582 #endif 2583 if (pr->pr_root != NULL) 2584 vrele(pr->pr_root); 2585 mtx_destroy(&pr->pr_mtx); 2586 #ifdef INET 2587 free(pr->pr_ip4, M_PRISON); 2588 #endif 2589 #ifdef INET6 2590 free(pr->pr_ip6, M_PRISON); 2591 #endif 2592 if (pr->pr_cpuset != NULL) 2593 cpuset_rel(pr->pr_cpuset); 2594 osd_jail_exit(pr); 2595 #ifdef RACCT 2596 prison_racct_detach(pr); 2597 #endif 2598 free(pr, M_PRISON); 2599 2600 /* Removing a prison frees a reference on its parent. */ 2601 pr = ppr; 2602 mtx_lock(&pr->pr_mtx); 2603 flags = PD_DEREF | PD_DEUREF; 2604 } 2605 } 2606 2607 void 2608 prison_hold_locked(struct prison *pr) 2609 { 2610 2611 mtx_assert(&pr->pr_mtx, MA_OWNED); 2612 KASSERT(pr->pr_ref > 0, 2613 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2614 pr->pr_ref++; 2615 } 2616 2617 void 2618 prison_hold(struct prison *pr) 2619 { 2620 2621 mtx_lock(&pr->pr_mtx); 2622 prison_hold_locked(pr); 2623 mtx_unlock(&pr->pr_mtx); 2624 } 2625 2626 void 2627 prison_proc_hold(struct prison *pr) 2628 { 2629 2630 mtx_lock(&pr->pr_mtx); 2631 KASSERT(pr->pr_uref > 0, 2632 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2633 pr->pr_uref++; 2634 mtx_unlock(&pr->pr_mtx); 2635 } 2636 2637 void 2638 prison_proc_free(struct prison *pr) 2639 { 2640 2641 mtx_lock(&pr->pr_mtx); 2642 KASSERT(pr->pr_uref > 0, 2643 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2644 prison_deref(pr, PD_DEUREF | PD_LOCKED); 2645 } 2646 2647 2648 #ifdef INET 2649 /* 2650 * Restrict a prison's IP address list with its parent's, possibly replacing 2651 * it. Return true if the replacement buffer was used (or would have been). 2652 */ 2653 static int 2654 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2655 { 2656 int ii, ij, used; 2657 struct prison *ppr; 2658 2659 ppr = pr->pr_parent; 2660 if (!(pr->pr_flags & PR_IP4_USER)) { 2661 /* This has no user settings, so just copy the parent's list. */ 2662 if (pr->pr_ip4s < ppr->pr_ip4s) { 2663 /* 2664 * There's no room for the parent's list. Use the 2665 * new list buffer, which is assumed to be big enough 2666 * (if it was passed). If there's no buffer, try to 2667 * allocate one. 2668 */ 2669 used = 1; 2670 if (newip4 == NULL) { 2671 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2672 M_PRISON, M_NOWAIT); 2673 if (newip4 != NULL) 2674 used = 0; 2675 } 2676 if (newip4 != NULL) { 2677 bcopy(ppr->pr_ip4, newip4, 2678 ppr->pr_ip4s * sizeof(*newip4)); 2679 free(pr->pr_ip4, M_PRISON); 2680 pr->pr_ip4 = newip4; 2681 pr->pr_ip4s = ppr->pr_ip4s; 2682 } 2683 return (used); 2684 } 2685 pr->pr_ip4s = ppr->pr_ip4s; 2686 if (pr->pr_ip4s > 0) 2687 bcopy(ppr->pr_ip4, pr->pr_ip4, 2688 pr->pr_ip4s * sizeof(*newip4)); 2689 else if (pr->pr_ip4 != NULL) { 2690 free(pr->pr_ip4, M_PRISON); 2691 pr->pr_ip4 = NULL; 2692 } 2693 } else if (pr->pr_ip4s > 0) { 2694 /* Remove addresses that aren't in the parent. */ 2695 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2696 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2697 break; 2698 if (ij < ppr->pr_ip4s) 2699 ii = 1; 2700 else { 2701 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2702 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2703 ii = 0; 2704 } 2705 for (ij = 1; ii < pr->pr_ip4s; ) { 2706 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2707 ii++; 2708 continue; 2709 } 2710 switch (ij >= ppr->pr_ip4s ? -1 : 2711 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2712 case -1: 2713 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2714 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2715 break; 2716 case 0: 2717 ii++; 2718 ij++; 2719 break; 2720 case 1: 2721 ij++; 2722 break; 2723 } 2724 } 2725 if (pr->pr_ip4s == 0) { 2726 pr->pr_flags |= PR_IP4_DISABLE; 2727 free(pr->pr_ip4, M_PRISON); 2728 pr->pr_ip4 = NULL; 2729 } 2730 } 2731 return (0); 2732 } 2733 2734 /* 2735 * Pass back primary IPv4 address of this jail. 2736 * 2737 * If not restricted return success but do not alter the address. Caller has 2738 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2739 * 2740 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2741 * Address returned in NBO. 2742 */ 2743 int 2744 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2745 { 2746 struct prison *pr; 2747 2748 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2749 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2750 2751 pr = cred->cr_prison; 2752 if (!(pr->pr_flags & PR_IP4)) 2753 return (0); 2754 mtx_lock(&pr->pr_mtx); 2755 if (!(pr->pr_flags & PR_IP4)) { 2756 mtx_unlock(&pr->pr_mtx); 2757 return (0); 2758 } 2759 if (pr->pr_ip4 == NULL) { 2760 mtx_unlock(&pr->pr_mtx); 2761 return (EAFNOSUPPORT); 2762 } 2763 2764 ia->s_addr = pr->pr_ip4[0].s_addr; 2765 mtx_unlock(&pr->pr_mtx); 2766 return (0); 2767 } 2768 2769 /* 2770 * Return 1 if we should do proper source address selection or are not jailed. 2771 * We will return 0 if we should bypass source address selection in favour 2772 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2773 * returned in NBO. 2774 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2775 */ 2776 int 2777 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2778 { 2779 struct prison *pr; 2780 struct in_addr lia; 2781 int error; 2782 2783 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2784 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2785 2786 if (!jailed(cred)) 2787 return (1); 2788 2789 pr = cred->cr_prison; 2790 if (pr->pr_flags & PR_IP4_SADDRSEL) 2791 return (1); 2792 2793 lia.s_addr = INADDR_ANY; 2794 error = prison_get_ip4(cred, &lia); 2795 if (error) 2796 return (error); 2797 if (lia.s_addr == INADDR_ANY) 2798 return (1); 2799 2800 ia->s_addr = lia.s_addr; 2801 return (0); 2802 } 2803 2804 /* 2805 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2806 */ 2807 int 2808 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2809 { 2810 2811 if (pr1 == pr2) 2812 return (1); 2813 2814 /* 2815 * No need to lock since the PR_IP4_USER flag can't be altered for 2816 * existing prisons. 2817 */ 2818 while (pr1 != &prison0 && 2819 #ifdef VIMAGE 2820 !(pr1->pr_flags & PR_VNET) && 2821 #endif 2822 !(pr1->pr_flags & PR_IP4_USER)) 2823 pr1 = pr1->pr_parent; 2824 while (pr2 != &prison0 && 2825 #ifdef VIMAGE 2826 !(pr2->pr_flags & PR_VNET) && 2827 #endif 2828 !(pr2->pr_flags & PR_IP4_USER)) 2829 pr2 = pr2->pr_parent; 2830 return (pr1 == pr2); 2831 } 2832 2833 /* 2834 * Make sure our (source) address is set to something meaningful to this 2835 * jail. 2836 * 2837 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2838 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2839 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2840 */ 2841 int 2842 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2843 { 2844 struct prison *pr; 2845 struct in_addr ia0; 2846 int error; 2847 2848 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2849 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2850 2851 pr = cred->cr_prison; 2852 if (!(pr->pr_flags & PR_IP4)) 2853 return (0); 2854 mtx_lock(&pr->pr_mtx); 2855 if (!(pr->pr_flags & PR_IP4)) { 2856 mtx_unlock(&pr->pr_mtx); 2857 return (0); 2858 } 2859 if (pr->pr_ip4 == NULL) { 2860 mtx_unlock(&pr->pr_mtx); 2861 return (EAFNOSUPPORT); 2862 } 2863 2864 ia0.s_addr = ntohl(ia->s_addr); 2865 if (ia0.s_addr == INADDR_LOOPBACK) { 2866 ia->s_addr = pr->pr_ip4[0].s_addr; 2867 mtx_unlock(&pr->pr_mtx); 2868 return (0); 2869 } 2870 2871 if (ia0.s_addr == INADDR_ANY) { 2872 /* 2873 * In case there is only 1 IPv4 address, bind directly. 2874 */ 2875 if (pr->pr_ip4s == 1) 2876 ia->s_addr = pr->pr_ip4[0].s_addr; 2877 mtx_unlock(&pr->pr_mtx); 2878 return (0); 2879 } 2880 2881 error = _prison_check_ip4(pr, ia); 2882 mtx_unlock(&pr->pr_mtx); 2883 return (error); 2884 } 2885 2886 /* 2887 * Rewrite destination address in case we will connect to loopback address. 2888 * 2889 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2890 * Address passed in in NBO and returned in NBO. 2891 */ 2892 int 2893 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 2894 { 2895 struct prison *pr; 2896 2897 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2898 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2899 2900 pr = cred->cr_prison; 2901 if (!(pr->pr_flags & PR_IP4)) 2902 return (0); 2903 mtx_lock(&pr->pr_mtx); 2904 if (!(pr->pr_flags & PR_IP4)) { 2905 mtx_unlock(&pr->pr_mtx); 2906 return (0); 2907 } 2908 if (pr->pr_ip4 == NULL) { 2909 mtx_unlock(&pr->pr_mtx); 2910 return (EAFNOSUPPORT); 2911 } 2912 2913 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 2914 ia->s_addr = pr->pr_ip4[0].s_addr; 2915 mtx_unlock(&pr->pr_mtx); 2916 return (0); 2917 } 2918 2919 /* 2920 * Return success because nothing had to be changed. 2921 */ 2922 mtx_unlock(&pr->pr_mtx); 2923 return (0); 2924 } 2925 2926 /* 2927 * Check if given address belongs to the jail referenced by cred/prison. 2928 * 2929 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2930 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2931 * doesn't allow IPv4. Address passed in in NBO. 2932 */ 2933 static int 2934 _prison_check_ip4(struct prison *pr, struct in_addr *ia) 2935 { 2936 int i, a, z, d; 2937 2938 /* 2939 * Check the primary IP. 2940 */ 2941 if (pr->pr_ip4[0].s_addr == ia->s_addr) 2942 return (0); 2943 2944 /* 2945 * All the other IPs are sorted so we can do a binary search. 2946 */ 2947 a = 0; 2948 z = pr->pr_ip4s - 2; 2949 while (a <= z) { 2950 i = (a + z) / 2; 2951 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 2952 if (d > 0) 2953 z = i - 1; 2954 else if (d < 0) 2955 a = i + 1; 2956 else 2957 return (0); 2958 } 2959 2960 return (EADDRNOTAVAIL); 2961 } 2962 2963 int 2964 prison_check_ip4(struct ucred *cred, struct in_addr *ia) 2965 { 2966 struct prison *pr; 2967 int error; 2968 2969 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2970 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2971 2972 pr = cred->cr_prison; 2973 if (!(pr->pr_flags & PR_IP4)) 2974 return (0); 2975 mtx_lock(&pr->pr_mtx); 2976 if (!(pr->pr_flags & PR_IP4)) { 2977 mtx_unlock(&pr->pr_mtx); 2978 return (0); 2979 } 2980 if (pr->pr_ip4 == NULL) { 2981 mtx_unlock(&pr->pr_mtx); 2982 return (EAFNOSUPPORT); 2983 } 2984 2985 error = _prison_check_ip4(pr, ia); 2986 mtx_unlock(&pr->pr_mtx); 2987 return (error); 2988 } 2989 #endif 2990 2991 #ifdef INET6 2992 static int 2993 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 2994 { 2995 int ii, ij, used; 2996 struct prison *ppr; 2997 2998 ppr = pr->pr_parent; 2999 if (!(pr->pr_flags & PR_IP6_USER)) { 3000 /* This has no user settings, so just copy the parent's list. */ 3001 if (pr->pr_ip6s < ppr->pr_ip6s) { 3002 /* 3003 * There's no room for the parent's list. Use the 3004 * new list buffer, which is assumed to be big enough 3005 * (if it was passed). If there's no buffer, try to 3006 * allocate one. 3007 */ 3008 used = 1; 3009 if (newip6 == NULL) { 3010 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 3011 M_PRISON, M_NOWAIT); 3012 if (newip6 != NULL) 3013 used = 0; 3014 } 3015 if (newip6 != NULL) { 3016 bcopy(ppr->pr_ip6, newip6, 3017 ppr->pr_ip6s * sizeof(*newip6)); 3018 free(pr->pr_ip6, M_PRISON); 3019 pr->pr_ip6 = newip6; 3020 pr->pr_ip6s = ppr->pr_ip6s; 3021 } 3022 return (used); 3023 } 3024 pr->pr_ip6s = ppr->pr_ip6s; 3025 if (pr->pr_ip6s > 0) 3026 bcopy(ppr->pr_ip6, pr->pr_ip6, 3027 pr->pr_ip6s * sizeof(*newip6)); 3028 else if (pr->pr_ip6 != NULL) { 3029 free(pr->pr_ip6, M_PRISON); 3030 pr->pr_ip6 = NULL; 3031 } 3032 } else if (pr->pr_ip6s > 0) { 3033 /* Remove addresses that aren't in the parent. */ 3034 for (ij = 0; ij < ppr->pr_ip6s; ij++) 3035 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 3036 &ppr->pr_ip6[ij])) 3037 break; 3038 if (ij < ppr->pr_ip6s) 3039 ii = 1; 3040 else { 3041 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 3042 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 3043 ii = 0; 3044 } 3045 for (ij = 1; ii < pr->pr_ip6s; ) { 3046 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 3047 &ppr->pr_ip6[0])) { 3048 ii++; 3049 continue; 3050 } 3051 switch (ij >= ppr->pr_ip6s ? -1 : 3052 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 3053 case -1: 3054 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 3055 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 3056 break; 3057 case 0: 3058 ii++; 3059 ij++; 3060 break; 3061 case 1: 3062 ij++; 3063 break; 3064 } 3065 } 3066 if (pr->pr_ip6s == 0) { 3067 pr->pr_flags |= PR_IP6_DISABLE; 3068 free(pr->pr_ip6, M_PRISON); 3069 pr->pr_ip6 = NULL; 3070 } 3071 } 3072 return 0; 3073 } 3074 3075 /* 3076 * Pass back primary IPv6 address for this jail. 3077 * 3078 * If not restricted return success but do not alter the address. Caller has 3079 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3080 * 3081 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3082 */ 3083 int 3084 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3085 { 3086 struct prison *pr; 3087 3088 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3089 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3090 3091 pr = cred->cr_prison; 3092 if (!(pr->pr_flags & PR_IP6)) 3093 return (0); 3094 mtx_lock(&pr->pr_mtx); 3095 if (!(pr->pr_flags & PR_IP6)) { 3096 mtx_unlock(&pr->pr_mtx); 3097 return (0); 3098 } 3099 if (pr->pr_ip6 == NULL) { 3100 mtx_unlock(&pr->pr_mtx); 3101 return (EAFNOSUPPORT); 3102 } 3103 3104 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3105 mtx_unlock(&pr->pr_mtx); 3106 return (0); 3107 } 3108 3109 /* 3110 * Return 1 if we should do proper source address selection or are not jailed. 3111 * We will return 0 if we should bypass source address selection in favour 3112 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3113 * returned in NBO. 3114 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3115 */ 3116 int 3117 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3118 { 3119 struct prison *pr; 3120 struct in6_addr lia6; 3121 int error; 3122 3123 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3124 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3125 3126 if (!jailed(cred)) 3127 return (1); 3128 3129 pr = cred->cr_prison; 3130 if (pr->pr_flags & PR_IP6_SADDRSEL) 3131 return (1); 3132 3133 lia6 = in6addr_any; 3134 error = prison_get_ip6(cred, &lia6); 3135 if (error) 3136 return (error); 3137 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3138 return (1); 3139 3140 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3141 return (0); 3142 } 3143 3144 /* 3145 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3146 */ 3147 int 3148 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3149 { 3150 3151 if (pr1 == pr2) 3152 return (1); 3153 3154 while (pr1 != &prison0 && 3155 #ifdef VIMAGE 3156 !(pr1->pr_flags & PR_VNET) && 3157 #endif 3158 !(pr1->pr_flags & PR_IP6_USER)) 3159 pr1 = pr1->pr_parent; 3160 while (pr2 != &prison0 && 3161 #ifdef VIMAGE 3162 !(pr2->pr_flags & PR_VNET) && 3163 #endif 3164 !(pr2->pr_flags & PR_IP6_USER)) 3165 pr2 = pr2->pr_parent; 3166 return (pr1 == pr2); 3167 } 3168 3169 /* 3170 * Make sure our (source) address is set to something meaningful to this jail. 3171 * 3172 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3173 * when needed while binding. 3174 * 3175 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3176 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3177 * doesn't allow IPv6. 3178 */ 3179 int 3180 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3181 { 3182 struct prison *pr; 3183 int error; 3184 3185 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3186 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3187 3188 pr = cred->cr_prison; 3189 if (!(pr->pr_flags & PR_IP6)) 3190 return (0); 3191 mtx_lock(&pr->pr_mtx); 3192 if (!(pr->pr_flags & PR_IP6)) { 3193 mtx_unlock(&pr->pr_mtx); 3194 return (0); 3195 } 3196 if (pr->pr_ip6 == NULL) { 3197 mtx_unlock(&pr->pr_mtx); 3198 return (EAFNOSUPPORT); 3199 } 3200 3201 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3202 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3203 mtx_unlock(&pr->pr_mtx); 3204 return (0); 3205 } 3206 3207 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3208 /* 3209 * In case there is only 1 IPv6 address, and v6only is true, 3210 * then bind directly. 3211 */ 3212 if (v6only != 0 && pr->pr_ip6s == 1) 3213 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3214 mtx_unlock(&pr->pr_mtx); 3215 return (0); 3216 } 3217 3218 error = _prison_check_ip6(pr, ia6); 3219 mtx_unlock(&pr->pr_mtx); 3220 return (error); 3221 } 3222 3223 /* 3224 * Rewrite destination address in case we will connect to loopback address. 3225 * 3226 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3227 */ 3228 int 3229 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3230 { 3231 struct prison *pr; 3232 3233 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3234 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3235 3236 pr = cred->cr_prison; 3237 if (!(pr->pr_flags & PR_IP6)) 3238 return (0); 3239 mtx_lock(&pr->pr_mtx); 3240 if (!(pr->pr_flags & PR_IP6)) { 3241 mtx_unlock(&pr->pr_mtx); 3242 return (0); 3243 } 3244 if (pr->pr_ip6 == NULL) { 3245 mtx_unlock(&pr->pr_mtx); 3246 return (EAFNOSUPPORT); 3247 } 3248 3249 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3250 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3251 mtx_unlock(&pr->pr_mtx); 3252 return (0); 3253 } 3254 3255 /* 3256 * Return success because nothing had to be changed. 3257 */ 3258 mtx_unlock(&pr->pr_mtx); 3259 return (0); 3260 } 3261 3262 /* 3263 * Check if given address belongs to the jail referenced by cred/prison. 3264 * 3265 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3266 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3267 * doesn't allow IPv6. 3268 */ 3269 static int 3270 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3271 { 3272 int i, a, z, d; 3273 3274 /* 3275 * Check the primary IP. 3276 */ 3277 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3278 return (0); 3279 3280 /* 3281 * All the other IPs are sorted so we can do a binary search. 3282 */ 3283 a = 0; 3284 z = pr->pr_ip6s - 2; 3285 while (a <= z) { 3286 i = (a + z) / 2; 3287 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3288 if (d > 0) 3289 z = i - 1; 3290 else if (d < 0) 3291 a = i + 1; 3292 else 3293 return (0); 3294 } 3295 3296 return (EADDRNOTAVAIL); 3297 } 3298 3299 int 3300 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3301 { 3302 struct prison *pr; 3303 int error; 3304 3305 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3306 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3307 3308 pr = cred->cr_prison; 3309 if (!(pr->pr_flags & PR_IP6)) 3310 return (0); 3311 mtx_lock(&pr->pr_mtx); 3312 if (!(pr->pr_flags & PR_IP6)) { 3313 mtx_unlock(&pr->pr_mtx); 3314 return (0); 3315 } 3316 if (pr->pr_ip6 == NULL) { 3317 mtx_unlock(&pr->pr_mtx); 3318 return (EAFNOSUPPORT); 3319 } 3320 3321 error = _prison_check_ip6(pr, ia6); 3322 mtx_unlock(&pr->pr_mtx); 3323 return (error); 3324 } 3325 #endif 3326 3327 /* 3328 * Check if a jail supports the given address family. 3329 * 3330 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3331 * if not. 3332 */ 3333 int 3334 prison_check_af(struct ucred *cred, int af) 3335 { 3336 struct prison *pr; 3337 int error; 3338 3339 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3340 3341 pr = cred->cr_prison; 3342 #ifdef VIMAGE 3343 /* Prisons with their own network stack are not limited. */ 3344 if (prison_owns_vnet(cred)) 3345 return (0); 3346 #endif 3347 3348 error = 0; 3349 switch (af) 3350 { 3351 #ifdef INET 3352 case AF_INET: 3353 if (pr->pr_flags & PR_IP4) 3354 { 3355 mtx_lock(&pr->pr_mtx); 3356 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3357 error = EAFNOSUPPORT; 3358 mtx_unlock(&pr->pr_mtx); 3359 } 3360 break; 3361 #endif 3362 #ifdef INET6 3363 case AF_INET6: 3364 if (pr->pr_flags & PR_IP6) 3365 { 3366 mtx_lock(&pr->pr_mtx); 3367 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3368 error = EAFNOSUPPORT; 3369 mtx_unlock(&pr->pr_mtx); 3370 } 3371 break; 3372 #endif 3373 case AF_LOCAL: 3374 case AF_ROUTE: 3375 break; 3376 default: 3377 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3378 error = EAFNOSUPPORT; 3379 } 3380 return (error); 3381 } 3382 3383 /* 3384 * Check if given address belongs to the jail referenced by cred (wrapper to 3385 * prison_check_ip[46]). 3386 * 3387 * Returns 0 if jail doesn't restrict the address family or if address belongs 3388 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3389 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3390 */ 3391 int 3392 prison_if(struct ucred *cred, struct sockaddr *sa) 3393 { 3394 #ifdef INET 3395 struct sockaddr_in *sai; 3396 #endif 3397 #ifdef INET6 3398 struct sockaddr_in6 *sai6; 3399 #endif 3400 int error; 3401 3402 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3403 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3404 3405 #ifdef VIMAGE 3406 if (prison_owns_vnet(cred)) 3407 return (0); 3408 #endif 3409 3410 error = 0; 3411 switch (sa->sa_family) 3412 { 3413 #ifdef INET 3414 case AF_INET: 3415 sai = (struct sockaddr_in *)sa; 3416 error = prison_check_ip4(cred, &sai->sin_addr); 3417 break; 3418 #endif 3419 #ifdef INET6 3420 case AF_INET6: 3421 sai6 = (struct sockaddr_in6 *)sa; 3422 error = prison_check_ip6(cred, &sai6->sin6_addr); 3423 break; 3424 #endif 3425 default: 3426 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3427 error = EAFNOSUPPORT; 3428 } 3429 return (error); 3430 } 3431 3432 /* 3433 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3434 */ 3435 int 3436 prison_check(struct ucred *cred1, struct ucred *cred2) 3437 { 3438 3439 return ((cred1->cr_prison == cred2->cr_prison || 3440 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3441 } 3442 3443 /* 3444 * Return 1 if p2 is a child of p1, otherwise 0. 3445 */ 3446 int 3447 prison_ischild(struct prison *pr1, struct prison *pr2) 3448 { 3449 3450 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3451 if (pr1 == pr2) 3452 return (1); 3453 return (0); 3454 } 3455 3456 /* 3457 * Return 1 if the passed credential is in a jail, otherwise 0. 3458 */ 3459 int 3460 jailed(struct ucred *cred) 3461 { 3462 3463 return (cred->cr_prison != &prison0); 3464 } 3465 3466 /* 3467 * Return 1 if the passed credential is in a jail and that jail does not 3468 * have its own virtual network stack, otherwise 0. 3469 */ 3470 int 3471 jailed_without_vnet(struct ucred *cred) 3472 { 3473 3474 if (!jailed(cred)) 3475 return (0); 3476 #ifdef VIMAGE 3477 if (prison_owns_vnet(cred)) 3478 return (0); 3479 #endif 3480 3481 return (1); 3482 } 3483 3484 /* 3485 * Return the correct hostname (domainname, et al) for the passed credential. 3486 */ 3487 void 3488 getcredhostname(struct ucred *cred, char *buf, size_t size) 3489 { 3490 struct prison *pr; 3491 3492 /* 3493 * A NULL credential can be used to shortcut to the physical 3494 * system's hostname. 3495 */ 3496 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3497 mtx_lock(&pr->pr_mtx); 3498 strlcpy(buf, pr->pr_hostname, size); 3499 mtx_unlock(&pr->pr_mtx); 3500 } 3501 3502 void 3503 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3504 { 3505 3506 mtx_lock(&cred->cr_prison->pr_mtx); 3507 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3508 mtx_unlock(&cred->cr_prison->pr_mtx); 3509 } 3510 3511 void 3512 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3513 { 3514 3515 mtx_lock(&cred->cr_prison->pr_mtx); 3516 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3517 mtx_unlock(&cred->cr_prison->pr_mtx); 3518 } 3519 3520 void 3521 getcredhostid(struct ucred *cred, unsigned long *hostid) 3522 { 3523 3524 mtx_lock(&cred->cr_prison->pr_mtx); 3525 *hostid = cred->cr_prison->pr_hostid; 3526 mtx_unlock(&cred->cr_prison->pr_mtx); 3527 } 3528 3529 #ifdef VIMAGE 3530 /* 3531 * Determine whether the prison represented by cred owns 3532 * its vnet rather than having it inherited. 3533 * 3534 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3535 */ 3536 int 3537 prison_owns_vnet(struct ucred *cred) 3538 { 3539 3540 /* 3541 * vnets cannot be added/removed after jail creation, 3542 * so no need to lock here. 3543 */ 3544 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3545 } 3546 #endif 3547 3548 /* 3549 * Determine whether the subject represented by cred can "see" 3550 * status of a mount point. 3551 * Returns: 0 for permitted, ENOENT otherwise. 3552 * XXX: This function should be called cr_canseemount() and should be 3553 * placed in kern_prot.c. 3554 */ 3555 int 3556 prison_canseemount(struct ucred *cred, struct mount *mp) 3557 { 3558 struct prison *pr; 3559 struct statfs *sp; 3560 size_t len; 3561 3562 pr = cred->cr_prison; 3563 if (pr->pr_enforce_statfs == 0) 3564 return (0); 3565 if (pr->pr_root->v_mount == mp) 3566 return (0); 3567 if (pr->pr_enforce_statfs == 2) 3568 return (ENOENT); 3569 /* 3570 * If jail's chroot directory is set to "/" we should be able to see 3571 * all mount-points from inside a jail. 3572 * This is ugly check, but this is the only situation when jail's 3573 * directory ends with '/'. 3574 */ 3575 if (strcmp(pr->pr_path, "/") == 0) 3576 return (0); 3577 len = strlen(pr->pr_path); 3578 sp = &mp->mnt_stat; 3579 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3580 return (ENOENT); 3581 /* 3582 * Be sure that we don't have situation where jail's root directory 3583 * is "/some/path" and mount point is "/some/pathpath". 3584 */ 3585 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3586 return (ENOENT); 3587 return (0); 3588 } 3589 3590 void 3591 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3592 { 3593 char jpath[MAXPATHLEN]; 3594 struct prison *pr; 3595 size_t len; 3596 3597 pr = cred->cr_prison; 3598 if (pr->pr_enforce_statfs == 0) 3599 return; 3600 if (prison_canseemount(cred, mp) != 0) { 3601 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3602 strlcpy(sp->f_mntonname, "[restricted]", 3603 sizeof(sp->f_mntonname)); 3604 return; 3605 } 3606 if (pr->pr_root->v_mount == mp) { 3607 /* 3608 * Clear current buffer data, so we are sure nothing from 3609 * the valid path left there. 3610 */ 3611 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3612 *sp->f_mntonname = '/'; 3613 return; 3614 } 3615 /* 3616 * If jail's chroot directory is set to "/" we should be able to see 3617 * all mount-points from inside a jail. 3618 */ 3619 if (strcmp(pr->pr_path, "/") == 0) 3620 return; 3621 len = strlen(pr->pr_path); 3622 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3623 /* 3624 * Clear current buffer data, so we are sure nothing from 3625 * the valid path left there. 3626 */ 3627 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3628 if (*jpath == '\0') { 3629 /* Should never happen. */ 3630 *sp->f_mntonname = '/'; 3631 } else { 3632 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3633 } 3634 } 3635 3636 /* 3637 * Check with permission for a specific privilege is granted within jail. We 3638 * have a specific list of accepted privileges; the rest are denied. 3639 */ 3640 int 3641 prison_priv_check(struct ucred *cred, int priv) 3642 { 3643 3644 if (!jailed(cred)) 3645 return (0); 3646 3647 #ifdef VIMAGE 3648 /* 3649 * Privileges specific to prisons with a virtual network stack. 3650 * There might be a duplicate entry here in case the privilege 3651 * is only granted conditionally in the legacy jail case. 3652 */ 3653 switch (priv) { 3654 #ifdef notyet 3655 /* 3656 * NFS-specific privileges. 3657 */ 3658 case PRIV_NFS_DAEMON: 3659 case PRIV_NFS_LOCKD: 3660 #endif 3661 /* 3662 * Network stack privileges. 3663 */ 3664 case PRIV_NET_BRIDGE: 3665 case PRIV_NET_GRE: 3666 case PRIV_NET_BPF: 3667 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3668 case PRIV_NET_ROUTE: 3669 case PRIV_NET_TAP: 3670 case PRIV_NET_SETIFMTU: 3671 case PRIV_NET_SETIFFLAGS: 3672 case PRIV_NET_SETIFCAP: 3673 case PRIV_NET_SETIFDESCR: 3674 case PRIV_NET_SETIFNAME : 3675 case PRIV_NET_SETIFMETRIC: 3676 case PRIV_NET_SETIFPHYS: 3677 case PRIV_NET_SETIFMAC: 3678 case PRIV_NET_ADDMULTI: 3679 case PRIV_NET_DELMULTI: 3680 case PRIV_NET_HWIOCTL: 3681 case PRIV_NET_SETLLADDR: 3682 case PRIV_NET_ADDIFGROUP: 3683 case PRIV_NET_DELIFGROUP: 3684 case PRIV_NET_IFCREATE: 3685 case PRIV_NET_IFDESTROY: 3686 case PRIV_NET_ADDIFADDR: 3687 case PRIV_NET_DELIFADDR: 3688 case PRIV_NET_LAGG: 3689 case PRIV_NET_GIF: 3690 case PRIV_NET_SETIFVNET: 3691 case PRIV_NET_SETIFFIB: 3692 3693 /* 3694 * 802.11-related privileges. 3695 */ 3696 case PRIV_NET80211_GETKEY: 3697 #ifdef notyet 3698 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3699 #endif 3700 3701 #ifdef notyet 3702 /* 3703 * AppleTalk privileges. 3704 */ 3705 case PRIV_NETATALK_RESERVEDPORT: 3706 3707 /* 3708 * ATM privileges. 3709 */ 3710 case PRIV_NETATM_CFG: 3711 case PRIV_NETATM_ADD: 3712 case PRIV_NETATM_DEL: 3713 case PRIV_NETATM_SET: 3714 3715 /* 3716 * Bluetooth privileges. 3717 */ 3718 case PRIV_NETBLUETOOTH_RAW: 3719 #endif 3720 3721 /* 3722 * Netgraph and netgraph module privileges. 3723 */ 3724 case PRIV_NETGRAPH_CONTROL: 3725 #ifdef notyet 3726 case PRIV_NETGRAPH_TTY: 3727 #endif 3728 3729 /* 3730 * IPv4 and IPv6 privileges. 3731 */ 3732 case PRIV_NETINET_IPFW: 3733 case PRIV_NETINET_DIVERT: 3734 case PRIV_NETINET_PF: 3735 case PRIV_NETINET_DUMMYNET: 3736 case PRIV_NETINET_CARP: 3737 case PRIV_NETINET_MROUTE: 3738 case PRIV_NETINET_RAW: 3739 case PRIV_NETINET_ADDRCTRL6: 3740 case PRIV_NETINET_ND6: 3741 case PRIV_NETINET_SCOPE6: 3742 case PRIV_NETINET_ALIFETIME6: 3743 case PRIV_NETINET_IPSEC: 3744 case PRIV_NETINET_BINDANY: 3745 3746 #ifdef notyet 3747 /* 3748 * IPX/SPX privileges. 3749 */ 3750 case PRIV_NETIPX_RESERVEDPORT: 3751 case PRIV_NETIPX_RAW: 3752 3753 /* 3754 * NCP privileges. 3755 */ 3756 case PRIV_NETNCP: 3757 3758 /* 3759 * SMB privileges. 3760 */ 3761 case PRIV_NETSMB: 3762 #endif 3763 3764 /* 3765 * No default: or deny here. 3766 * In case of no permit fall through to next switch(). 3767 */ 3768 if (cred->cr_prison->pr_flags & PR_VNET) 3769 return (0); 3770 } 3771 #endif /* VIMAGE */ 3772 3773 switch (priv) { 3774 3775 /* 3776 * Allow ktrace privileges for root in jail. 3777 */ 3778 case PRIV_KTRACE: 3779 3780 #if 0 3781 /* 3782 * Allow jailed processes to configure audit identity and 3783 * submit audit records (login, etc). In the future we may 3784 * want to further refine the relationship between audit and 3785 * jail. 3786 */ 3787 case PRIV_AUDIT_GETAUDIT: 3788 case PRIV_AUDIT_SETAUDIT: 3789 case PRIV_AUDIT_SUBMIT: 3790 #endif 3791 3792 /* 3793 * Allow jailed processes to manipulate process UNIX 3794 * credentials in any way they see fit. 3795 */ 3796 case PRIV_CRED_SETUID: 3797 case PRIV_CRED_SETEUID: 3798 case PRIV_CRED_SETGID: 3799 case PRIV_CRED_SETEGID: 3800 case PRIV_CRED_SETGROUPS: 3801 case PRIV_CRED_SETREUID: 3802 case PRIV_CRED_SETREGID: 3803 case PRIV_CRED_SETRESUID: 3804 case PRIV_CRED_SETRESGID: 3805 3806 /* 3807 * Jail implements visibility constraints already, so allow 3808 * jailed root to override uid/gid-based constraints. 3809 */ 3810 case PRIV_SEEOTHERGIDS: 3811 case PRIV_SEEOTHERUIDS: 3812 3813 /* 3814 * Jail implements inter-process debugging limits already, so 3815 * allow jailed root various debugging privileges. 3816 */ 3817 case PRIV_DEBUG_DIFFCRED: 3818 case PRIV_DEBUG_SUGID: 3819 case PRIV_DEBUG_UNPRIV: 3820 3821 /* 3822 * Allow jail to set various resource limits and login 3823 * properties, and for now, exceed process resource limits. 3824 */ 3825 case PRIV_PROC_LIMIT: 3826 case PRIV_PROC_SETLOGIN: 3827 case PRIV_PROC_SETRLIMIT: 3828 3829 /* 3830 * System V and POSIX IPC privileges are granted in jail. 3831 */ 3832 case PRIV_IPC_READ: 3833 case PRIV_IPC_WRITE: 3834 case PRIV_IPC_ADMIN: 3835 case PRIV_IPC_MSGSIZE: 3836 case PRIV_MQ_ADMIN: 3837 3838 /* 3839 * Jail operations within a jail work on child jails. 3840 */ 3841 case PRIV_JAIL_ATTACH: 3842 case PRIV_JAIL_SET: 3843 case PRIV_JAIL_REMOVE: 3844 3845 /* 3846 * Jail implements its own inter-process limits, so allow 3847 * root processes in jail to change scheduling on other 3848 * processes in the same jail. Likewise for signalling. 3849 */ 3850 case PRIV_SCHED_DIFFCRED: 3851 case PRIV_SCHED_CPUSET: 3852 case PRIV_SIGNAL_DIFFCRED: 3853 case PRIV_SIGNAL_SUGID: 3854 3855 /* 3856 * Allow jailed processes to write to sysctls marked as jail 3857 * writable. 3858 */ 3859 case PRIV_SYSCTL_WRITEJAIL: 3860 3861 /* 3862 * Allow root in jail to manage a variety of quota 3863 * properties. These should likely be conditional on a 3864 * configuration option. 3865 */ 3866 case PRIV_VFS_GETQUOTA: 3867 case PRIV_VFS_SETQUOTA: 3868 3869 /* 3870 * Since Jail relies on chroot() to implement file system 3871 * protections, grant many VFS privileges to root in jail. 3872 * Be careful to exclude mount-related and NFS-related 3873 * privileges. 3874 */ 3875 case PRIV_VFS_READ: 3876 case PRIV_VFS_WRITE: 3877 case PRIV_VFS_ADMIN: 3878 case PRIV_VFS_EXEC: 3879 case PRIV_VFS_LOOKUP: 3880 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3881 case PRIV_VFS_CHFLAGS_DEV: 3882 case PRIV_VFS_CHOWN: 3883 case PRIV_VFS_CHROOT: 3884 case PRIV_VFS_RETAINSUGID: 3885 case PRIV_VFS_FCHROOT: 3886 case PRIV_VFS_LINK: 3887 case PRIV_VFS_SETGID: 3888 case PRIV_VFS_STAT: 3889 case PRIV_VFS_STICKYFILE: 3890 3891 /* 3892 * As in the non-jail case, non-root users are expected to be 3893 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3894 * exists in the jail and they have permission to access it). 3895 */ 3896 case PRIV_KMEM_READ: 3897 return (0); 3898 3899 /* 3900 * Depending on the global setting, allow privilege of 3901 * setting system flags. 3902 */ 3903 case PRIV_VFS_SYSFLAGS: 3904 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3905 return (0); 3906 else 3907 return (EPERM); 3908 3909 /* 3910 * Depending on the global setting, allow privilege of 3911 * mounting/unmounting file systems. 3912 */ 3913 case PRIV_VFS_MOUNT: 3914 case PRIV_VFS_UNMOUNT: 3915 case PRIV_VFS_MOUNT_NONUSER: 3916 case PRIV_VFS_MOUNT_OWNER: 3917 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3918 cred->cr_prison->pr_enforce_statfs < 2) 3919 return (0); 3920 else 3921 return (EPERM); 3922 3923 /* 3924 * Allow jailed root to bind reserved ports and reuse in-use 3925 * ports. 3926 */ 3927 case PRIV_NETINET_RESERVEDPORT: 3928 case PRIV_NETINET_REUSEPORT: 3929 return (0); 3930 3931 /* 3932 * Allow jailed root to set certian IPv4/6 (option) headers. 3933 */ 3934 case PRIV_NETINET_SETHDROPTS: 3935 return (0); 3936 3937 /* 3938 * Conditionally allow creating raw sockets in jail. 3939 */ 3940 case PRIV_NETINET_RAW: 3941 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3942 return (0); 3943 else 3944 return (EPERM); 3945 3946 /* 3947 * Since jail implements its own visibility limits on netstat 3948 * sysctls, allow getcred. This allows identd to work in 3949 * jail. 3950 */ 3951 case PRIV_NETINET_GETCRED: 3952 return (0); 3953 3954 /* 3955 * Allow jailed root to set loginclass. 3956 */ 3957 case PRIV_PROC_SETLOGINCLASS: 3958 return (0); 3959 3960 default: 3961 /* 3962 * In all remaining cases, deny the privilege request. This 3963 * includes almost all network privileges, many system 3964 * configuration privileges. 3965 */ 3966 return (EPERM); 3967 } 3968 } 3969 3970 /* 3971 * Return the part of pr2's name that is relative to pr1, or the whole name 3972 * if it does not directly follow. 3973 */ 3974 3975 char * 3976 prison_name(struct prison *pr1, struct prison *pr2) 3977 { 3978 char *name; 3979 3980 /* Jails see themselves as "" (if they see themselves at all). */ 3981 if (pr1 == pr2) 3982 return ""; 3983 name = pr2->pr_name; 3984 if (prison_ischild(pr1, pr2)) { 3985 /* 3986 * pr1 isn't locked (and allprison_lock may not be either) 3987 * so its length can't be counted on. But the number of dots 3988 * can be counted on - and counted. 3989 */ 3990 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3991 name = strchr(name, '.') + 1; 3992 } 3993 return (name); 3994 } 3995 3996 /* 3997 * Return the part of pr2's path that is relative to pr1, or the whole path 3998 * if it does not directly follow. 3999 */ 4000 static char * 4001 prison_path(struct prison *pr1, struct prison *pr2) 4002 { 4003 char *path1, *path2; 4004 int len1; 4005 4006 path1 = pr1->pr_path; 4007 path2 = pr2->pr_path; 4008 if (!strcmp(path1, "/")) 4009 return (path2); 4010 len1 = strlen(path1); 4011 if (strncmp(path1, path2, len1)) 4012 return (path2); 4013 if (path2[len1] == '\0') 4014 return "/"; 4015 if (path2[len1] == '/') 4016 return (path2 + len1); 4017 return (path2); 4018 } 4019 4020 4021 /* 4022 * Jail-related sysctls. 4023 */ 4024 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 4025 "Jails"); 4026 4027 static int 4028 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4029 { 4030 struct xprison *xp; 4031 struct prison *pr, *cpr; 4032 #ifdef INET 4033 struct in_addr *ip4 = NULL; 4034 int ip4s = 0; 4035 #endif 4036 #ifdef INET6 4037 struct in6_addr *ip6 = NULL; 4038 int ip6s = 0; 4039 #endif 4040 int descend, error; 4041 4042 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4043 pr = req->td->td_ucred->cr_prison; 4044 error = 0; 4045 sx_slock(&allprison_lock); 4046 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4047 #if defined(INET) || defined(INET6) 4048 again: 4049 #endif 4050 mtx_lock(&cpr->pr_mtx); 4051 #ifdef INET 4052 if (cpr->pr_ip4s > 0) { 4053 if (ip4s < cpr->pr_ip4s) { 4054 ip4s = cpr->pr_ip4s; 4055 mtx_unlock(&cpr->pr_mtx); 4056 ip4 = realloc(ip4, ip4s * 4057 sizeof(struct in_addr), M_TEMP, M_WAITOK); 4058 goto again; 4059 } 4060 bcopy(cpr->pr_ip4, ip4, 4061 cpr->pr_ip4s * sizeof(struct in_addr)); 4062 } 4063 #endif 4064 #ifdef INET6 4065 if (cpr->pr_ip6s > 0) { 4066 if (ip6s < cpr->pr_ip6s) { 4067 ip6s = cpr->pr_ip6s; 4068 mtx_unlock(&cpr->pr_mtx); 4069 ip6 = realloc(ip6, ip6s * 4070 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 4071 goto again; 4072 } 4073 bcopy(cpr->pr_ip6, ip6, 4074 cpr->pr_ip6s * sizeof(struct in6_addr)); 4075 } 4076 #endif 4077 if (cpr->pr_ref == 0) { 4078 mtx_unlock(&cpr->pr_mtx); 4079 continue; 4080 } 4081 bzero(xp, sizeof(*xp)); 4082 xp->pr_version = XPRISON_VERSION; 4083 xp->pr_id = cpr->pr_id; 4084 xp->pr_state = cpr->pr_uref > 0 4085 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 4086 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4087 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4088 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4089 #ifdef INET 4090 xp->pr_ip4s = cpr->pr_ip4s; 4091 #endif 4092 #ifdef INET6 4093 xp->pr_ip6s = cpr->pr_ip6s; 4094 #endif 4095 mtx_unlock(&cpr->pr_mtx); 4096 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4097 if (error) 4098 break; 4099 #ifdef INET 4100 if (xp->pr_ip4s > 0) { 4101 error = SYSCTL_OUT(req, ip4, 4102 xp->pr_ip4s * sizeof(struct in_addr)); 4103 if (error) 4104 break; 4105 } 4106 #endif 4107 #ifdef INET6 4108 if (xp->pr_ip6s > 0) { 4109 error = SYSCTL_OUT(req, ip6, 4110 xp->pr_ip6s * sizeof(struct in6_addr)); 4111 if (error) 4112 break; 4113 } 4114 #endif 4115 } 4116 sx_sunlock(&allprison_lock); 4117 free(xp, M_TEMP); 4118 #ifdef INET 4119 free(ip4, M_TEMP); 4120 #endif 4121 #ifdef INET6 4122 free(ip6, M_TEMP); 4123 #endif 4124 return (error); 4125 } 4126 4127 SYSCTL_OID(_security_jail, OID_AUTO, list, 4128 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4129 sysctl_jail_list, "S", "List of active jails"); 4130 4131 static int 4132 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4133 { 4134 int error, injail; 4135 4136 injail = jailed(req->td->td_ucred); 4137 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4138 4139 return (error); 4140 } 4141 4142 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4143 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4144 sysctl_jail_jailed, "I", "Process in jail?"); 4145 4146 static int 4147 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4148 { 4149 int error, havevnet; 4150 #ifdef VIMAGE 4151 struct ucred *cred = req->td->td_ucred; 4152 4153 havevnet = jailed(cred) && prison_owns_vnet(cred); 4154 #else 4155 havevnet = 0; 4156 #endif 4157 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4158 4159 return (error); 4160 } 4161 4162 SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4163 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4164 sysctl_jail_vnet, "I", "Jail owns VNET?"); 4165 4166 #if defined(INET) || defined(INET6) 4167 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4168 &jail_max_af_ips, 0, 4169 "Number of IP addresses a jail may have at most per address family"); 4170 #endif 4171 4172 /* 4173 * Default parameters for jail(2) compatability. For historical reasons, 4174 * the sysctl names have varying similarity to the parameter names. Prisons 4175 * just see their own parameters, and can't change them. 4176 */ 4177 static int 4178 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4179 { 4180 struct prison *pr; 4181 int allow, error, i; 4182 4183 pr = req->td->td_ucred->cr_prison; 4184 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4185 4186 /* Get the current flag value, and convert it to a boolean. */ 4187 i = (allow & arg2) ? 1 : 0; 4188 if (arg1 != NULL) 4189 i = !i; 4190 error = sysctl_handle_int(oidp, &i, 0, req); 4191 if (error || !req->newptr) 4192 return (error); 4193 i = i ? arg2 : 0; 4194 if (arg1 != NULL) 4195 i ^= arg2; 4196 /* 4197 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4198 * for writing. 4199 */ 4200 mtx_lock(&prison0.pr_mtx); 4201 jail_default_allow = (jail_default_allow & ~arg2) | i; 4202 mtx_unlock(&prison0.pr_mtx); 4203 return (0); 4204 } 4205 4206 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4207 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4208 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4209 "Processes in jail can set their hostnames"); 4210 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4211 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4212 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4213 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 4214 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4215 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4216 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4217 "Processes in jail can use System V IPC primitives"); 4218 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4219 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4220 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4221 "Prison root can create raw sockets"); 4222 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4223 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4224 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4225 "Processes in jail can alter system file flags"); 4226 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4227 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4228 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4229 "Processes in jail can mount/unmount jail-friendly file systems"); 4230 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed, 4231 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4232 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I", 4233 "Processes in jail can mount the devfs file system"); 4234 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed, 4235 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4236 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I", 4237 "Processes in jail can mount the nullfs file system"); 4238 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed, 4239 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4240 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I", 4241 "Processes in jail can mount the procfs file system"); 4242 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed, 4243 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4244 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I", 4245 "Processes in jail can mount the tmpfs file system"); 4246 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed, 4247 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4248 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I", 4249 "Processes in jail can mount the zfs file system"); 4250 4251 static int 4252 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4253 { 4254 struct prison *pr; 4255 int level, error; 4256 4257 pr = req->td->td_ucred->cr_prison; 4258 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4259 error = sysctl_handle_int(oidp, &level, 0, req); 4260 if (error || !req->newptr) 4261 return (error); 4262 *(int *)arg1 = level; 4263 return (0); 4264 } 4265 4266 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4267 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4268 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4269 sysctl_jail_default_level, "I", 4270 "Processes in jail cannot see all mounted file systems"); 4271 4272 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4273 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4274 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4275 sysctl_jail_default_level, "I", 4276 "Ruleset for the devfs filesystem in jail"); 4277 4278 /* 4279 * Nodes to describe jail parameters. Maximum length of string parameters 4280 * is returned in the string itself, and the other parameters exist merely 4281 * to make themselves and their types known. 4282 */ 4283 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4284 "Jail parameters"); 4285 4286 int 4287 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4288 { 4289 int i; 4290 long l; 4291 size_t s; 4292 char numbuf[12]; 4293 4294 switch (oidp->oid_kind & CTLTYPE) 4295 { 4296 case CTLTYPE_LONG: 4297 case CTLTYPE_ULONG: 4298 l = 0; 4299 #ifdef SCTL_MASK32 4300 if (!(req->flags & SCTL_MASK32)) 4301 #endif 4302 return (SYSCTL_OUT(req, &l, sizeof(l))); 4303 case CTLTYPE_INT: 4304 case CTLTYPE_UINT: 4305 i = 0; 4306 return (SYSCTL_OUT(req, &i, sizeof(i))); 4307 case CTLTYPE_STRING: 4308 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4309 return 4310 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4311 case CTLTYPE_STRUCT: 4312 s = (size_t)arg2; 4313 return (SYSCTL_OUT(req, &s, sizeof(s))); 4314 } 4315 return (0); 4316 } 4317 4318 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4319 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4320 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4321 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4322 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4323 "I", "Jail secure level"); 4324 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4325 "I", "Jail cannot see all mounted file systems"); 4326 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4327 "I", "Ruleset for in-jail devfs mounts"); 4328 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4329 "B", "Jail persistence"); 4330 #ifdef VIMAGE 4331 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4332 "E,jailsys", "Virtual network stack"); 4333 #endif 4334 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4335 "B", "Jail is in the process of shutting down"); 4336 4337 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4338 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4339 "I", "Current number of child jails"); 4340 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4341 "I", "Maximum number of child jails"); 4342 4343 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4344 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4345 "Jail hostname"); 4346 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4347 "Jail NIS domainname"); 4348 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4349 "Jail host UUID"); 4350 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4351 "LU", "Jail host ID"); 4352 4353 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4354 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4355 4356 #ifdef INET 4357 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4358 "Jail IPv4 address virtualization"); 4359 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4360 "S,in_addr,a", "Jail IPv4 addresses"); 4361 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4362 "B", "Do (not) use IPv4 source address selection rather than the " 4363 "primary jail IPv4 address."); 4364 #endif 4365 #ifdef INET6 4366 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4367 "Jail IPv6 address virtualization"); 4368 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4369 "S,in6_addr,a", "Jail IPv6 addresses"); 4370 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4371 "B", "Do (not) use IPv6 source address selection rather than the " 4372 "primary jail IPv6 address."); 4373 #endif 4374 4375 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4376 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4377 "B", "Jail may set hostname"); 4378 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4379 "B", "Jail may use SYSV IPC"); 4380 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4381 "B", "Jail may create raw sockets"); 4382 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4383 "B", "Jail may alter system file flags"); 4384 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4385 "B", "Jail may set file quotas"); 4386 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4387 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4388 4389 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4390 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4391 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4392 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW, 4393 "B", "Jail may mount the devfs file system"); 4394 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW, 4395 "B", "Jail may mount the nullfs file system"); 4396 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW, 4397 "B", "Jail may mount the procfs file system"); 4398 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW, 4399 "B", "Jail may mount the tmpfs file system"); 4400 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW, 4401 "B", "Jail may mount the zfs file system"); 4402 4403 void 4404 prison_racct_foreach(void (*callback)(struct racct *racct, 4405 void *arg2, void *arg3), void *arg2, void *arg3) 4406 { 4407 struct prison_racct *prr; 4408 4409 sx_slock(&allprison_lock); 4410 LIST_FOREACH(prr, &allprison_racct, prr_next) 4411 (callback)(prr->prr_racct, arg2, arg3); 4412 sx_sunlock(&allprison_lock); 4413 } 4414 4415 static struct prison_racct * 4416 prison_racct_find_locked(const char *name) 4417 { 4418 struct prison_racct *prr; 4419 4420 sx_assert(&allprison_lock, SA_XLOCKED); 4421 4422 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4423 return (NULL); 4424 4425 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4426 if (strcmp(name, prr->prr_name) != 0) 4427 continue; 4428 4429 /* Found prison_racct with a matching name? */ 4430 prison_racct_hold(prr); 4431 return (prr); 4432 } 4433 4434 /* Add new prison_racct. */ 4435 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4436 racct_create(&prr->prr_racct); 4437 4438 strcpy(prr->prr_name, name); 4439 refcount_init(&prr->prr_refcount, 1); 4440 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4441 4442 return (prr); 4443 } 4444 4445 struct prison_racct * 4446 prison_racct_find(const char *name) 4447 { 4448 struct prison_racct *prr; 4449 4450 sx_xlock(&allprison_lock); 4451 prr = prison_racct_find_locked(name); 4452 sx_xunlock(&allprison_lock); 4453 return (prr); 4454 } 4455 4456 void 4457 prison_racct_hold(struct prison_racct *prr) 4458 { 4459 4460 refcount_acquire(&prr->prr_refcount); 4461 } 4462 4463 static void 4464 prison_racct_free_locked(struct prison_racct *prr) 4465 { 4466 4467 sx_assert(&allprison_lock, SA_XLOCKED); 4468 4469 if (refcount_release(&prr->prr_refcount)) { 4470 racct_destroy(&prr->prr_racct); 4471 LIST_REMOVE(prr, prr_next); 4472 free(prr, M_PRISON_RACCT); 4473 } 4474 } 4475 4476 void 4477 prison_racct_free(struct prison_racct *prr) 4478 { 4479 int old; 4480 4481 sx_assert(&allprison_lock, SA_UNLOCKED); 4482 4483 old = prr->prr_refcount; 4484 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4485 return; 4486 4487 sx_xlock(&allprison_lock); 4488 prison_racct_free_locked(prr); 4489 sx_xunlock(&allprison_lock); 4490 } 4491 4492 #ifdef RACCT 4493 static void 4494 prison_racct_attach(struct prison *pr) 4495 { 4496 struct prison_racct *prr; 4497 4498 sx_assert(&allprison_lock, SA_XLOCKED); 4499 4500 prr = prison_racct_find_locked(pr->pr_name); 4501 KASSERT(prr != NULL, ("cannot find prison_racct")); 4502 4503 pr->pr_prison_racct = prr; 4504 } 4505 4506 /* 4507 * Handle jail renaming. From the racct point of view, renaming means 4508 * moving from one prison_racct to another. 4509 */ 4510 static void 4511 prison_racct_modify(struct prison *pr) 4512 { 4513 struct proc *p; 4514 struct ucred *cred; 4515 struct prison_racct *oldprr; 4516 4517 sx_slock(&allproc_lock); 4518 sx_xlock(&allprison_lock); 4519 4520 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4521 sx_xunlock(&allprison_lock); 4522 sx_sunlock(&allproc_lock); 4523 return; 4524 } 4525 4526 oldprr = pr->pr_prison_racct; 4527 pr->pr_prison_racct = NULL; 4528 4529 prison_racct_attach(pr); 4530 4531 /* 4532 * Move resource utilisation records. 4533 */ 4534 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4535 4536 /* 4537 * Force rctl to reattach rules to processes. 4538 */ 4539 FOREACH_PROC_IN_SYSTEM(p) { 4540 PROC_LOCK(p); 4541 cred = crhold(p->p_ucred); 4542 PROC_UNLOCK(p); 4543 racct_proc_ucred_changed(p, cred, cred); 4544 crfree(cred); 4545 } 4546 4547 sx_sunlock(&allproc_lock); 4548 prison_racct_free_locked(oldprr); 4549 sx_xunlock(&allprison_lock); 4550 } 4551 4552 static void 4553 prison_racct_detach(struct prison *pr) 4554 { 4555 4556 sx_assert(&allprison_lock, SA_UNLOCKED); 4557 4558 if (pr->pr_prison_racct == NULL) 4559 return; 4560 prison_racct_free(pr->pr_prison_racct); 4561 pr->pr_prison_racct = NULL; 4562 } 4563 #endif /* RACCT */ 4564 4565 #ifdef DDB 4566 4567 static void 4568 db_show_prison(struct prison *pr) 4569 { 4570 int fi; 4571 #if defined(INET) || defined(INET6) 4572 int ii; 4573 #endif 4574 unsigned jsf; 4575 #ifdef INET6 4576 char ip6buf[INET6_ADDRSTRLEN]; 4577 #endif 4578 4579 db_printf("prison %p:\n", pr); 4580 db_printf(" jid = %d\n", pr->pr_id); 4581 db_printf(" name = %s\n", pr->pr_name); 4582 db_printf(" parent = %p\n", pr->pr_parent); 4583 db_printf(" ref = %d\n", pr->pr_ref); 4584 db_printf(" uref = %d\n", pr->pr_uref); 4585 db_printf(" path = %s\n", pr->pr_path); 4586 db_printf(" cpuset = %d\n", pr->pr_cpuset 4587 ? pr->pr_cpuset->cs_id : -1); 4588 #ifdef VIMAGE 4589 db_printf(" vnet = %p\n", pr->pr_vnet); 4590 #endif 4591 db_printf(" root = %p\n", pr->pr_root); 4592 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4593 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4594 db_printf(" children.max = %d\n", pr->pr_childmax); 4595 db_printf(" children.cur = %d\n", pr->pr_childcount); 4596 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4597 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4598 db_printf(" flags = 0x%x", pr->pr_flags); 4599 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4600 fi++) 4601 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4602 db_printf(" %s", pr_flag_names[fi]); 4603 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4604 fi++) { 4605 jsf = pr->pr_flags & 4606 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4607 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4608 pr_flag_jailsys[fi].disable && 4609 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4610 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4611 : "inherit"); 4612 } 4613 db_printf(" allow = 0x%x", pr->pr_allow); 4614 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4615 fi++) 4616 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4617 db_printf(" %s", pr_allow_names[fi]); 4618 db_printf("\n"); 4619 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4620 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4621 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4622 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4623 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4624 #ifdef INET 4625 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4626 for (ii = 0; ii < pr->pr_ip4s; ii++) 4627 db_printf(" %s %s\n", 4628 ii == 0 ? "ip4.addr =" : " ", 4629 inet_ntoa(pr->pr_ip4[ii])); 4630 #endif 4631 #ifdef INET6 4632 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4633 for (ii = 0; ii < pr->pr_ip6s; ii++) 4634 db_printf(" %s %s\n", 4635 ii == 0 ? "ip6.addr =" : " ", 4636 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4637 #endif 4638 } 4639 4640 DB_SHOW_COMMAND(prison, db_show_prison_command) 4641 { 4642 struct prison *pr; 4643 4644 if (!have_addr) { 4645 /* 4646 * Show all prisons in the list, and prison0 which is not 4647 * listed. 4648 */ 4649 db_show_prison(&prison0); 4650 if (!db_pager_quit) { 4651 TAILQ_FOREACH(pr, &allprison, pr_list) { 4652 db_show_prison(pr); 4653 if (db_pager_quit) 4654 break; 4655 } 4656 } 4657 return; 4658 } 4659 4660 if (addr == 0) 4661 pr = &prison0; 4662 else { 4663 /* Look for a prison with the ID and with references. */ 4664 TAILQ_FOREACH(pr, &allprison, pr_list) 4665 if (pr->pr_id == addr && pr->pr_ref > 0) 4666 break; 4667 if (pr == NULL) 4668 /* Look again, without requiring a reference. */ 4669 TAILQ_FOREACH(pr, &allprison, pr_list) 4670 if (pr->pr_id == addr) 4671 break; 4672 if (pr == NULL) 4673 /* Assume address points to a valid prison. */ 4674 pr = (struct prison *)addr; 4675 } 4676 db_show_prison(pr); 4677 } 4678 4679 #endif /* DDB */
Cache object: 491ec2eb1169d216ba6c7a15d60bce1c
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]