kern_jail.c revision 277985
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: stable/10/sys/kern/kern_jail.c 277985 2015-01-31 17:35:53Z jamie $"); 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 80MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 81static 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. */ 99struct prison prison0 = { 100 .pr_id = 0, 101 .pr_name = "0", 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}; 117MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 118 119/* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 120struct sx allprison_lock; 121SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 122struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 123LIST_HEAD(, prison_racct) allprison_racct; 124int lastprid = 0; 125 126static int do_jail_attach(struct thread *td, struct prison *pr); 127static void prison_complete(void *context, int pending); 128static void prison_deref(struct prison *pr, int flags); 129static char *prison_path(struct prison *pr1, struct prison *pr2); 130static void prison_remove_one(struct prison *pr); 131#ifdef RACCT 132static void prison_racct_attach(struct prison *pr); 133static void prison_racct_modify(struct prison *pr); 134static void prison_racct_detach(struct prison *pr); 135#endif 136#ifdef INET 137static int _prison_check_ip4(struct prison *pr, struct in_addr *ia); 138static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4); 139#endif 140#ifdef INET6 141static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6); 142static 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 */ 157static 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}; 166const size_t pr_flag_names_size = sizeof(pr_flag_names); 167 168static 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}; 177const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames); 178 179struct 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}; 195const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 196 197static char *pr_allow_names[] = { 198 "allow.set_hostname", 199 "allow.sysvipc", 200 "allow.raw_sockets", 201 "allow.chflags", 202 "allow.mount", 203 "allow.quotas", 204 "allow.socket_af", 205 "allow.mount.devfs", 206 "allow.mount.nullfs", 207 "allow.mount.zfs", 208 "allow.mount.procfs", 209 "allow.mount.tmpfs", 210 "allow.mount.fdescfs", 211}; 212const size_t pr_allow_names_size = sizeof(pr_allow_names); 213 214static char *pr_allow_nonames[] = { 215 "allow.noset_hostname", 216 "allow.nosysvipc", 217 "allow.noraw_sockets", 218 "allow.nochflags", 219 "allow.nomount", 220 "allow.noquotas", 221 "allow.nosocket_af", 222 "allow.mount.nodevfs", 223 "allow.mount.nonullfs", 224 "allow.mount.nozfs", 225 "allow.mount.noprocfs", 226 "allow.mount.notmpfs", 227 "allow.mount.nofdescfs", 228}; 229const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames); 230 231#define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME 232#define JAIL_DEFAULT_ENFORCE_STATFS 2 233#define JAIL_DEFAULT_DEVFS_RSNUM 0 234static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 235static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 236static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM; 237#if defined(INET) || defined(INET6) 238static unsigned jail_max_af_ips = 255; 239#endif 240 241#ifdef INET 242static int 243qcmp_v4(const void *ip1, const void *ip2) 244{ 245 in_addr_t iaa, iab; 246 247 /* 248 * We need to compare in HBO here to get the list sorted as expected 249 * by the result of the code. Sorting NBO addresses gives you 250 * interesting results. If you do not understand, do not try. 251 */ 252 iaa = ntohl(((const struct in_addr *)ip1)->s_addr); 253 iab = ntohl(((const struct in_addr *)ip2)->s_addr); 254 255 /* 256 * Do not simply return the difference of the two numbers, the int is 257 * not wide enough. 258 */ 259 if (iaa > iab) 260 return (1); 261 else if (iaa < iab) 262 return (-1); 263 else 264 return (0); 265} 266#endif 267 268#ifdef INET6 269static int 270qcmp_v6(const void *ip1, const void *ip2) 271{ 272 const struct in6_addr *ia6a, *ia6b; 273 int i, rc; 274 275 ia6a = (const struct in6_addr *)ip1; 276 ia6b = (const struct in6_addr *)ip2; 277 278 rc = 0; 279 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { 280 if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) 281 rc = 1; 282 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) 283 rc = -1; 284 } 285 return (rc); 286} 287#endif 288 289/* 290 * struct jail_args { 291 * struct jail *jail; 292 * }; 293 */ 294int 295sys_jail(struct thread *td, struct jail_args *uap) 296{ 297 uint32_t version; 298 int error; 299 struct jail j; 300 301 error = copyin(uap->jail, &version, sizeof(uint32_t)); 302 if (error) 303 return (error); 304 305 switch (version) { 306 case 0: 307 { 308 struct jail_v0 j0; 309 310 /* FreeBSD single IPv4 jails. */ 311 bzero(&j, sizeof(struct jail)); 312 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 313 if (error) 314 return (error); 315 j.version = j0.version; 316 j.path = j0.path; 317 j.hostname = j0.hostname; 318 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */ 319 break; 320 } 321 322 case 1: 323 /* 324 * Version 1 was used by multi-IPv4 jail implementations 325 * that never made it into the official kernel. 326 */ 327 return (EINVAL); 328 329 case 2: /* JAIL_API_VERSION */ 330 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 331 error = copyin(uap->jail, &j, sizeof(struct jail)); 332 if (error) 333 return (error); 334 break; 335 336 default: 337 /* Sci-Fi jails are not supported, sorry. */ 338 return (EINVAL); 339 } 340 return (kern_jail(td, &j)); 341} 342 343int 344kern_jail(struct thread *td, struct jail *j) 345{ 346 struct iovec optiov[2 * (4 347 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0]) 348#ifdef INET 349 + 1 350#endif 351#ifdef INET6 352 + 1 353#endif 354 )]; 355 struct uio opt; 356 char *u_path, *u_hostname, *u_name; 357#ifdef INET 358 uint32_t ip4s; 359 struct in_addr *u_ip4; 360#endif 361#ifdef INET6 362 struct in6_addr *u_ip6; 363#endif 364 size_t tmplen; 365 int error, enforce_statfs, fi; 366 367 bzero(&optiov, sizeof(optiov)); 368 opt.uio_iov = optiov; 369 opt.uio_iovcnt = 0; 370 opt.uio_offset = -1; 371 opt.uio_resid = -1; 372 opt.uio_segflg = UIO_SYSSPACE; 373 opt.uio_rw = UIO_READ; 374 opt.uio_td = td; 375 376 /* Set permissions for top-level jails from sysctls. */ 377 if (!jailed(td->td_ucred)) { 378 for (fi = 0; fi < sizeof(pr_allow_names) / 379 sizeof(pr_allow_names[0]); fi++) { 380 optiov[opt.uio_iovcnt].iov_base = 381 (jail_default_allow & (1 << fi)) 382 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 383 optiov[opt.uio_iovcnt].iov_len = 384 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 385 opt.uio_iovcnt += 2; 386 } 387 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 388 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 389 opt.uio_iovcnt++; 390 enforce_statfs = jail_default_enforce_statfs; 391 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 392 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 393 opt.uio_iovcnt++; 394 } 395 396 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 397#ifdef INET 398 ip4s = (j->version == 0) ? 1 : j->ip4s; 399 if (ip4s > jail_max_af_ips) 400 return (EINVAL); 401 tmplen += ip4s * sizeof(struct in_addr); 402#else 403 if (j->ip4s > 0) 404 return (EINVAL); 405#endif 406#ifdef INET6 407 if (j->ip6s > jail_max_af_ips) 408 return (EINVAL); 409 tmplen += j->ip6s * sizeof(struct in6_addr); 410#else 411 if (j->ip6s > 0) 412 return (EINVAL); 413#endif 414 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 415 u_hostname = u_path + MAXPATHLEN; 416 u_name = u_hostname + MAXHOSTNAMELEN; 417#ifdef INET 418 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 419#endif 420#ifdef INET6 421#ifdef INET 422 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 423#else 424 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 425#endif 426#endif 427 optiov[opt.uio_iovcnt].iov_base = "path"; 428 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 429 opt.uio_iovcnt++; 430 optiov[opt.uio_iovcnt].iov_base = u_path; 431 error = copyinstr(j->path, u_path, MAXPATHLEN, 432 &optiov[opt.uio_iovcnt].iov_len); 433 if (error) { 434 free(u_path, M_TEMP); 435 return (error); 436 } 437 opt.uio_iovcnt++; 438 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 439 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 440 opt.uio_iovcnt++; 441 optiov[opt.uio_iovcnt].iov_base = u_hostname; 442 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 443 &optiov[opt.uio_iovcnt].iov_len); 444 if (error) { 445 free(u_path, M_TEMP); 446 return (error); 447 } 448 opt.uio_iovcnt++; 449 if (j->jailname != NULL) { 450 optiov[opt.uio_iovcnt].iov_base = "name"; 451 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 452 opt.uio_iovcnt++; 453 optiov[opt.uio_iovcnt].iov_base = u_name; 454 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 455 &optiov[opt.uio_iovcnt].iov_len); 456 if (error) { 457 free(u_path, M_TEMP); 458 return (error); 459 } 460 opt.uio_iovcnt++; 461 } 462#ifdef INET 463 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 464 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 465 opt.uio_iovcnt++; 466 optiov[opt.uio_iovcnt].iov_base = u_ip4; 467 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 468 if (j->version == 0) 469 u_ip4->s_addr = j->ip4s; 470 else { 471 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 472 if (error) { 473 free(u_path, M_TEMP); 474 return (error); 475 } 476 } 477 opt.uio_iovcnt++; 478#endif 479#ifdef INET6 480 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 481 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 482 opt.uio_iovcnt++; 483 optiov[opt.uio_iovcnt].iov_base = u_ip6; 484 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 485 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 486 if (error) { 487 free(u_path, M_TEMP); 488 return (error); 489 } 490 opt.uio_iovcnt++; 491#endif 492 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]), 493 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 494 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 495 free(u_path, M_TEMP); 496 return (error); 497} 498 499 500/* 501 * struct jail_set_args { 502 * struct iovec *iovp; 503 * unsigned int iovcnt; 504 * int flags; 505 * }; 506 */ 507int 508sys_jail_set(struct thread *td, struct jail_set_args *uap) 509{ 510 struct uio *auio; 511 int error; 512 513 /* Check that we have an even number of iovecs. */ 514 if (uap->iovcnt & 1) 515 return (EINVAL); 516 517 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 518 if (error) 519 return (error); 520 error = kern_jail_set(td, auio, uap->flags); 521 free(auio, M_IOV); 522 return (error); 523} 524 525int 526kern_jail_set(struct thread *td, struct uio *optuio, int flags) 527{ 528 struct nameidata nd; 529#ifdef INET 530 struct in_addr *ip4; 531#endif 532#ifdef INET6 533 struct in6_addr *ip6; 534#endif 535 struct vfsopt *opt; 536 struct vfsoptlist *opts; 537 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 538 struct vnode *root; 539 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 540 char *g_path; 541#if defined(INET) || defined(INET6) 542 struct prison *tppr; 543 void *op; 544#endif 545 unsigned long hid; 546 size_t namelen, onamelen; 547 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos; 548 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel; 549 int fi, jid, jsys, len, level; 550 int childmax, rsnum, slevel; 551 int fullpath_disabled; 552#if defined(INET) || defined(INET6) 553 int ii, ij; 554#endif 555#ifdef INET 556 int ip4s, redo_ip4; 557#endif 558#ifdef INET6 559 int ip6s, redo_ip6; 560#endif 561 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 562 unsigned tallow; 563 char numbuf[12]; 564 565 error = priv_check(td, PRIV_JAIL_SET); 566 if (!error && (flags & JAIL_ATTACH)) 567 error = priv_check(td, PRIV_JAIL_ATTACH); 568 if (error) 569 return (error); 570 mypr = ppr = td->td_ucred->cr_prison; 571 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 572 return (EPERM); 573 if (flags & ~JAIL_SET_MASK) 574 return (EINVAL); 575 576 /* 577 * Check all the parameters before committing to anything. Not all 578 * errors can be caught early, but we may as well try. Also, this 579 * takes care of some expensive stuff (path lookup) before getting 580 * the allprison lock. 581 * 582 * XXX Jails are not filesystems, and jail parameters are not mount 583 * options. But it makes more sense to re-use the vfsopt code 584 * than duplicate it under a different name. 585 */ 586 error = vfs_buildopts(optuio, &opts); 587 if (error) 588 return (error); 589#ifdef INET 590 ip4 = NULL; 591#endif 592#ifdef INET6 593 ip6 = NULL; 594#endif 595 g_path = NULL; 596 597 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 598 if (error == ENOENT) 599 jid = 0; 600 else if (error != 0) 601 goto done_free; 602 603 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 604 if (error == ENOENT) 605 gotslevel = 0; 606 else if (error != 0) 607 goto done_free; 608 else 609 gotslevel = 1; 610 611 error = 612 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 613 if (error == ENOENT) 614 gotchildmax = 0; 615 else if (error != 0) 616 goto done_free; 617 else 618 gotchildmax = 1; 619 620 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 621 if (error == ENOENT) 622 gotenforce = 0; 623 else if (error != 0) 624 goto done_free; 625 else if (enforce < 0 || enforce > 2) { 626 error = EINVAL; 627 goto done_free; 628 } else 629 gotenforce = 1; 630 631 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum)); 632 if (error == ENOENT) 633 gotrsnum = 0; 634 else if (error != 0) 635 goto done_free; 636 else 637 gotrsnum = 1; 638 639 pr_flags = ch_flags = 0; 640 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 641 fi++) { 642 if (pr_flag_names[fi] == NULL) 643 continue; 644 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 645 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 646 } 647 ch_flags |= pr_flags; 648 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 649 fi++) { 650 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys, 651 sizeof(jsys)); 652 if (error == ENOENT) 653 continue; 654 if (error != 0) 655 goto done_free; 656 switch (jsys) { 657 case JAIL_SYS_DISABLE: 658 if (!pr_flag_jailsys[fi].disable) { 659 error = EINVAL; 660 goto done_free; 661 } 662 pr_flags |= pr_flag_jailsys[fi].disable; 663 break; 664 case JAIL_SYS_NEW: 665 pr_flags |= pr_flag_jailsys[fi].new; 666 break; 667 case JAIL_SYS_INHERIT: 668 break; 669 default: 670 error = EINVAL; 671 goto done_free; 672 } 673 ch_flags |= 674 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable; 675 } 676 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 677 && !(pr_flags & PR_PERSIST)) { 678 error = EINVAL; 679 vfs_opterror(opts, "new jail must persist or attach"); 680 goto done_errmsg; 681 } 682#ifdef VIMAGE 683 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 684 error = EINVAL; 685 vfs_opterror(opts, "vnet cannot be changed after creation"); 686 goto done_errmsg; 687 } 688#endif 689#ifdef INET 690 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 691 error = EINVAL; 692 vfs_opterror(opts, "ip4 cannot be changed after creation"); 693 goto done_errmsg; 694 } 695#endif 696#ifdef INET6 697 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 698 error = EINVAL; 699 vfs_opterror(opts, "ip6 cannot be changed after creation"); 700 goto done_errmsg; 701 } 702#endif 703 704 pr_allow = ch_allow = 0; 705 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 706 fi++) { 707 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 708 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 709 } 710 ch_allow |= pr_allow; 711 712 error = vfs_getopt(opts, "name", (void **)&name, &len); 713 if (error == ENOENT) 714 name = NULL; 715 else if (error != 0) 716 goto done_free; 717 else { 718 if (len == 0 || name[len - 1] != '\0') { 719 error = EINVAL; 720 goto done_free; 721 } 722 if (len > MAXHOSTNAMELEN) { 723 error = ENAMETOOLONG; 724 goto done_free; 725 } 726 } 727 728 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 729 if (error == ENOENT) 730 host = NULL; 731 else if (error != 0) 732 goto done_free; 733 else { 734 ch_flags |= PR_HOST; 735 pr_flags |= PR_HOST; 736 if (len == 0 || host[len - 1] != '\0') { 737 error = EINVAL; 738 goto done_free; 739 } 740 if (len > MAXHOSTNAMELEN) { 741 error = ENAMETOOLONG; 742 goto done_free; 743 } 744 } 745 746 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 747 if (error == ENOENT) 748 domain = NULL; 749 else if (error != 0) 750 goto done_free; 751 else { 752 ch_flags |= PR_HOST; 753 pr_flags |= PR_HOST; 754 if (len == 0 || domain[len - 1] != '\0') { 755 error = EINVAL; 756 goto done_free; 757 } 758 if (len > MAXHOSTNAMELEN) { 759 error = ENAMETOOLONG; 760 goto done_free; 761 } 762 } 763 764 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 765 if (error == ENOENT) 766 uuid = NULL; 767 else if (error != 0) 768 goto done_free; 769 else { 770 ch_flags |= PR_HOST; 771 pr_flags |= PR_HOST; 772 if (len == 0 || uuid[len - 1] != '\0') { 773 error = EINVAL; 774 goto done_free; 775 } 776 if (len > HOSTUUIDLEN) { 777 error = ENAMETOOLONG; 778 goto done_free; 779 } 780 } 781 782#ifdef COMPAT_FREEBSD32 783 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 784 uint32_t hid32; 785 786 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 787 hid = hid32; 788 } else 789#endif 790 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 791 if (error == ENOENT) 792 gothid = 0; 793 else if (error != 0) 794 goto done_free; 795 else { 796 gothid = 1; 797 ch_flags |= PR_HOST; 798 pr_flags |= PR_HOST; 799 } 800 801#ifdef INET 802 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 803 if (error == ENOENT) 804 ip4s = 0; 805 else if (error != 0) 806 goto done_free; 807 else if (ip4s & (sizeof(*ip4) - 1)) { 808 error = EINVAL; 809 goto done_free; 810 } else { 811 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE; 812 if (ip4s == 0) 813 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE; 814 else { 815 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER; 816 ip4s /= sizeof(*ip4); 817 if (ip4s > jail_max_af_ips) { 818 error = EINVAL; 819 vfs_opterror(opts, "too many IPv4 addresses"); 820 goto done_errmsg; 821 } 822 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 823 bcopy(op, ip4, ip4s * sizeof(*ip4)); 824 /* 825 * IP addresses are all sorted but ip[0] to preserve 826 * the primary IP address as given from userland. 827 * This special IP is used for unbound outgoing 828 * connections as well for "loopback" traffic in case 829 * source address selection cannot find any more fitting 830 * address to connect from. 831 */ 832 if (ip4s > 1) 833 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4); 834 /* 835 * Check for duplicate addresses and do some simple 836 * zero and broadcast checks. If users give other bogus 837 * addresses it is their problem. 838 * 839 * We do not have to care about byte order for these 840 * checks so we will do them in NBO. 841 */ 842 for (ii = 0; ii < ip4s; ii++) { 843 if (ip4[ii].s_addr == INADDR_ANY || 844 ip4[ii].s_addr == INADDR_BROADCAST) { 845 error = EINVAL; 846 goto done_free; 847 } 848 if ((ii+1) < ip4s && 849 (ip4[0].s_addr == ip4[ii+1].s_addr || 850 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 851 error = EINVAL; 852 goto done_free; 853 } 854 } 855 } 856 } 857#endif 858 859#ifdef INET6 860 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 861 if (error == ENOENT) 862 ip6s = 0; 863 else if (error != 0) 864 goto done_free; 865 else if (ip6s & (sizeof(*ip6) - 1)) { 866 error = EINVAL; 867 goto done_free; 868 } else { 869 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE; 870 if (ip6s == 0) 871 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE; 872 else { 873 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER; 874 ip6s /= sizeof(*ip6); 875 if (ip6s > jail_max_af_ips) { 876 error = EINVAL; 877 vfs_opterror(opts, "too many IPv6 addresses"); 878 goto done_errmsg; 879 } 880 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 881 bcopy(op, ip6, ip6s * sizeof(*ip6)); 882 if (ip6s > 1) 883 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6); 884 for (ii = 0; ii < ip6s; ii++) { 885 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 886 error = EINVAL; 887 goto done_free; 888 } 889 if ((ii+1) < ip6s && 890 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 891 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 892 { 893 error = EINVAL; 894 goto done_free; 895 } 896 } 897 } 898 } 899#endif 900 901#if defined(VIMAGE) && (defined(INET) || defined(INET6)) 902 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 903 error = EINVAL; 904 vfs_opterror(opts, 905 "vnet jails cannot have IP address restrictions"); 906 goto done_errmsg; 907 } 908#endif 909 910 fullpath_disabled = 0; 911 root = NULL; 912 error = vfs_getopt(opts, "path", (void **)&path, &len); 913 if (error == ENOENT) 914 path = NULL; 915 else if (error != 0) 916 goto done_free; 917 else { 918 if (flags & JAIL_UPDATE) { 919 error = EINVAL; 920 vfs_opterror(opts, 921 "path cannot be changed after creation"); 922 goto done_errmsg; 923 } 924 if (len == 0 || path[len - 1] != '\0') { 925 error = EINVAL; 926 goto done_free; 927 } 928 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 929 path, td); 930 error = namei(&nd); 931 if (error) 932 goto done_free; 933 root = nd.ni_vp; 934 NDFREE(&nd, NDF_ONLY_PNBUF); 935 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 936 strlcpy(g_path, path, MAXPATHLEN); 937 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN); 938 if (error == 0) 939 path = g_path; 940 else if (error == ENODEV) { 941 /* proceed if sysctl debug.disablefullpath == 1 */ 942 fullpath_disabled = 1; 943 if (len < 2 || (len == 2 && path[0] == '/')) 944 path = NULL; 945 } else { 946 /* exit on other errors */ 947 goto done_free; 948 } 949 if (root->v_type != VDIR) { 950 error = ENOTDIR; 951 vput(root); 952 goto done_free; 953 } 954 VOP_UNLOCK(root, 0); 955 if (fullpath_disabled) { 956 /* Leave room for a real-root full pathname. */ 957 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 958 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 959 error = ENAMETOOLONG; 960 goto done_free; 961 } 962 } 963 } 964 965 /* 966 * Grab the allprison lock before letting modules check their 967 * parameters. Once we have it, do not let go so we'll have a 968 * consistent view of the OSD list. 969 */ 970 sx_xlock(&allprison_lock); 971 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts); 972 if (error) 973 goto done_unlock_list; 974 975 /* By now, all parameters should have been noted. */ 976 TAILQ_FOREACH(opt, opts, link) { 977 if (!opt->seen && strcmp(opt->name, "errmsg")) { 978 error = EINVAL; 979 vfs_opterror(opts, "unknown parameter: %s", opt->name); 980 goto done_unlock_list; 981 } 982 } 983 984 /* 985 * See if we are creating a new record or updating an existing one. 986 * This abuses the file error codes ENOENT and EEXIST. 987 */ 988 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 989 if (!cuflags) { 990 error = EINVAL; 991 vfs_opterror(opts, "no valid operation (create or update)"); 992 goto done_unlock_list; 993 } 994 pr = NULL; 995 namelc = NULL; 996 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 997 namelc = strrchr(name, '.'); 998 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 999 if (*p != '\0') 1000 jid = 0; 1001 } 1002 if (jid != 0) { 1003 /* 1004 * See if a requested jid already exists. There is an 1005 * information leak here if the jid exists but is not within 1006 * the caller's jail hierarchy. Jail creators will get EEXIST 1007 * even though they cannot see the jail, and CREATE | UPDATE 1008 * will return ENOENT which is not normally a valid error. 1009 */ 1010 if (jid < 0) { 1011 error = EINVAL; 1012 vfs_opterror(opts, "negative jid"); 1013 goto done_unlock_list; 1014 } 1015 pr = prison_find(jid); 1016 if (pr != NULL) { 1017 ppr = pr->pr_parent; 1018 /* Create: jid must not exist. */ 1019 if (cuflags == JAIL_CREATE) { 1020 mtx_unlock(&pr->pr_mtx); 1021 error = EEXIST; 1022 vfs_opterror(opts, "jail %d already exists", 1023 jid); 1024 goto done_unlock_list; 1025 } 1026 if (!prison_ischild(mypr, pr)) { 1027 mtx_unlock(&pr->pr_mtx); 1028 pr = NULL; 1029 } else if (pr->pr_uref == 0) { 1030 if (!(flags & JAIL_DYING)) { 1031 mtx_unlock(&pr->pr_mtx); 1032 error = ENOENT; 1033 vfs_opterror(opts, "jail %d is dying", 1034 jid); 1035 goto done_unlock_list; 1036 } else if ((flags & JAIL_ATTACH) || 1037 (pr_flags & PR_PERSIST)) { 1038 /* 1039 * A dying jail might be resurrected 1040 * (via attach or persist), but first 1041 * it must determine if another jail 1042 * has claimed its name. Accomplish 1043 * this by implicitly re-setting the 1044 * name. 1045 */ 1046 if (name == NULL) 1047 name = prison_name(mypr, pr); 1048 } 1049 } 1050 } 1051 if (pr == NULL) { 1052 /* Update: jid must exist. */ 1053 if (cuflags == JAIL_UPDATE) { 1054 error = ENOENT; 1055 vfs_opterror(opts, "jail %d not found", jid); 1056 goto done_unlock_list; 1057 } 1058 } 1059 } 1060 /* 1061 * If the caller provided a name, look for a jail by that name. 1062 * This has different semantics for creates and updates keyed by jid 1063 * (where the name must not already exist in a different jail), 1064 * and updates keyed by the name itself (where the name must exist 1065 * because that is the jail being updated). 1066 */ 1067 if (name != NULL) { 1068 namelc = strrchr(name, '.'); 1069 if (namelc == NULL) 1070 namelc = name; 1071 else { 1072 /* 1073 * This is a hierarchical name. Split it into the 1074 * parent and child names, and make sure the parent 1075 * exists or matches an already found jail. 1076 */ 1077 *namelc = '\0'; 1078 if (pr != NULL) { 1079 if (strncmp(name, ppr->pr_name, namelc - name) 1080 || ppr->pr_name[namelc - name] != '\0') { 1081 mtx_unlock(&pr->pr_mtx); 1082 error = EINVAL; 1083 vfs_opterror(opts, 1084 "cannot change jail's parent"); 1085 goto done_unlock_list; 1086 } 1087 } else { 1088 ppr = prison_find_name(mypr, name); 1089 if (ppr == NULL) { 1090 error = ENOENT; 1091 vfs_opterror(opts, 1092 "jail \"%s\" not found", name); 1093 goto done_unlock_list; 1094 } 1095 mtx_unlock(&ppr->pr_mtx); 1096 } 1097 name = ++namelc; 1098 } 1099 if (name[0] != '\0') { 1100 namelen = 1101 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1102 name_again: 1103 deadpr = NULL; 1104 FOREACH_PRISON_CHILD(ppr, tpr) { 1105 if (tpr != pr && tpr->pr_ref > 0 && 1106 !strcmp(tpr->pr_name + namelen, name)) { 1107 if (pr == NULL && 1108 cuflags != JAIL_CREATE) { 1109 mtx_lock(&tpr->pr_mtx); 1110 if (tpr->pr_ref > 0) { 1111 /* 1112 * Use this jail 1113 * for updates. 1114 */ 1115 if (tpr->pr_uref > 0) { 1116 pr = tpr; 1117 break; 1118 } 1119 deadpr = tpr; 1120 } 1121 mtx_unlock(&tpr->pr_mtx); 1122 } else if (tpr->pr_uref > 0) { 1123 /* 1124 * Create, or update(jid): 1125 * name must not exist in an 1126 * active sibling jail. 1127 */ 1128 error = EEXIST; 1129 if (pr != NULL) 1130 mtx_unlock(&pr->pr_mtx); 1131 vfs_opterror(opts, 1132 "jail \"%s\" already exists", 1133 name); 1134 goto done_unlock_list; 1135 } 1136 } 1137 } 1138 /* If no active jail is found, use a dying one. */ 1139 if (deadpr != NULL && pr == NULL) { 1140 if (flags & JAIL_DYING) { 1141 mtx_lock(&deadpr->pr_mtx); 1142 if (deadpr->pr_ref == 0) { 1143 mtx_unlock(&deadpr->pr_mtx); 1144 goto name_again; 1145 } 1146 pr = deadpr; 1147 } else if (cuflags == JAIL_UPDATE) { 1148 error = ENOENT; 1149 vfs_opterror(opts, 1150 "jail \"%s\" is dying", name); 1151 goto done_unlock_list; 1152 } 1153 } 1154 /* Update: name must exist if no jid. */ 1155 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1156 error = ENOENT; 1157 vfs_opterror(opts, "jail \"%s\" not found", 1158 name); 1159 goto done_unlock_list; 1160 } 1161 } 1162 } 1163 /* Update: must provide a jid or name. */ 1164 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1165 error = ENOENT; 1166 vfs_opterror(opts, "update specified no jail"); 1167 goto done_unlock_list; 1168 } 1169 1170 /* If there's no prison to update, create a new one and link it in. */ 1171 if (pr == NULL) { 1172 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1173 if (tpr->pr_childcount >= tpr->pr_childmax) { 1174 error = EPERM; 1175 vfs_opterror(opts, "prison limit exceeded"); 1176 goto done_unlock_list; 1177 } 1178 created = 1; 1179 mtx_lock(&ppr->pr_mtx); 1180 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) { 1181 mtx_unlock(&ppr->pr_mtx); 1182 error = ENOENT; 1183 vfs_opterror(opts, "parent jail went away!"); 1184 goto done_unlock_list; 1185 } 1186 ppr->pr_ref++; 1187 ppr->pr_uref++; 1188 mtx_unlock(&ppr->pr_mtx); 1189 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1190 if (jid == 0) { 1191 /* Find the next free jid. */ 1192 jid = lastprid + 1; 1193 findnext: 1194 if (jid == JAIL_MAX) 1195 jid = 1; 1196 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1197 if (tpr->pr_id < jid) 1198 continue; 1199 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1200 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1201 break; 1202 } 1203 if (jid == lastprid) { 1204 error = EAGAIN; 1205 vfs_opterror(opts, 1206 "no available jail IDs"); 1207 free(pr, M_PRISON); 1208 prison_deref(ppr, PD_DEREF | 1209 PD_DEUREF | PD_LIST_XLOCKED); 1210 goto done_releroot; 1211 } 1212 jid++; 1213 goto findnext; 1214 } 1215 lastprid = jid; 1216 } else { 1217 /* 1218 * The jail already has a jid (that did not yet exist), 1219 * so just find where to insert it. 1220 */ 1221 TAILQ_FOREACH(tpr, &allprison, pr_list) 1222 if (tpr->pr_id >= jid) { 1223 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1224 break; 1225 } 1226 } 1227 if (tpr == NULL) 1228 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1229 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1230 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1231 tpr->pr_childcount++; 1232 1233 pr->pr_parent = ppr; 1234 pr->pr_id = jid; 1235 1236 /* Set some default values, and inherit some from the parent. */ 1237 if (name == NULL) 1238 name = ""; 1239 if (path == NULL) { 1240 path = "/"; 1241 root = mypr->pr_root; 1242 vref(root); 1243 } 1244 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1245 pr->pr_flags |= PR_HOST; 1246#if defined(INET) || defined(INET6) 1247#ifdef VIMAGE 1248 if (!(pr_flags & PR_VNET)) 1249#endif 1250 { 1251#ifdef INET 1252 if (!(ch_flags & PR_IP4_USER)) 1253 pr->pr_flags |= 1254 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE; 1255 else if (!(pr_flags & PR_IP4_USER)) { 1256 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1257 if (ppr->pr_ip4 != NULL) { 1258 pr->pr_ip4s = ppr->pr_ip4s; 1259 pr->pr_ip4 = malloc(pr->pr_ip4s * 1260 sizeof(struct in_addr), M_PRISON, 1261 M_WAITOK); 1262 bcopy(ppr->pr_ip4, pr->pr_ip4, 1263 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1264 } 1265 } 1266#endif 1267#ifdef INET6 1268 if (!(ch_flags & PR_IP6_USER)) 1269 pr->pr_flags |= 1270 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE; 1271 else if (!(pr_flags & PR_IP6_USER)) { 1272 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1273 if (ppr->pr_ip6 != NULL) { 1274 pr->pr_ip6s = ppr->pr_ip6s; 1275 pr->pr_ip6 = malloc(pr->pr_ip6s * 1276 sizeof(struct in6_addr), M_PRISON, 1277 M_WAITOK); 1278 bcopy(ppr->pr_ip6, pr->pr_ip6, 1279 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1280 } 1281 } 1282#endif 1283 } 1284#endif 1285 /* Source address selection is always on by default. */ 1286 pr->pr_flags |= _PR_IP_SADDRSEL; 1287 1288 pr->pr_securelevel = ppr->pr_securelevel; 1289 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1290 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 1291 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum; 1292 1293 LIST_INIT(&pr->pr_children); 1294 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1295 1296#ifdef VIMAGE 1297 /* Allocate a new vnet if specified. */ 1298 pr->pr_vnet = (pr_flags & PR_VNET) 1299 ? vnet_alloc() : ppr->pr_vnet; 1300#endif 1301 /* 1302 * Allocate a dedicated cpuset for each jail. 1303 * Unlike other initial settings, this may return an erorr. 1304 */ 1305 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1306 if (error) { 1307 prison_deref(pr, PD_LIST_XLOCKED); 1308 goto done_releroot; 1309 } 1310 1311 mtx_lock(&pr->pr_mtx); 1312 /* 1313 * New prisons do not yet have a reference, because we do not 1314 * want other to see the incomplete prison once the 1315 * allprison_lock is downgraded. 1316 */ 1317 } else { 1318 created = 0; 1319 /* 1320 * Grab a reference for existing prisons, to ensure they 1321 * continue to exist for the duration of the call. 1322 */ 1323 pr->pr_ref++; 1324#if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1325 if ((pr->pr_flags & PR_VNET) && 1326 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1327 error = EINVAL; 1328 vfs_opterror(opts, 1329 "vnet jails cannot have IP address restrictions"); 1330 goto done_deref_locked; 1331 } 1332#endif 1333#ifdef INET 1334 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1335 error = EINVAL; 1336 vfs_opterror(opts, 1337 "ip4 cannot be changed after creation"); 1338 goto done_deref_locked; 1339 } 1340#endif 1341#ifdef INET6 1342 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1343 error = EINVAL; 1344 vfs_opterror(opts, 1345 "ip6 cannot be changed after creation"); 1346 goto done_deref_locked; 1347 } 1348#endif 1349 } 1350 1351 /* Do final error checking before setting anything. */ 1352 if (gotslevel) { 1353 if (slevel < ppr->pr_securelevel) { 1354 error = EPERM; 1355 goto done_deref_locked; 1356 } 1357 } 1358 if (gotchildmax) { 1359 if (childmax >= ppr->pr_childmax) { 1360 error = EPERM; 1361 goto done_deref_locked; 1362 } 1363 } 1364 if (gotenforce) { 1365 if (enforce < ppr->pr_enforce_statfs) { 1366 error = EPERM; 1367 goto done_deref_locked; 1368 } 1369 } 1370 if (gotrsnum) { 1371 /* 1372 * devfs_rsnum is a uint16_t 1373 */ 1374 if (rsnum < 0 || rsnum > 65535) { 1375 error = EINVAL; 1376 goto done_deref_locked; 1377 } 1378 /* 1379 * Nested jails always inherit parent's devfs ruleset 1380 */ 1381 if (jailed(td->td_ucred)) { 1382 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) { 1383 error = EPERM; 1384 goto done_deref_locked; 1385 } else 1386 rsnum = ppr->pr_devfs_rsnum; 1387 } 1388 } 1389#ifdef INET 1390 if (ip4s > 0) { 1391 if (ppr->pr_flags & PR_IP4) { 1392 /* 1393 * Make sure the new set of IP addresses is a 1394 * subset of the parent's list. Don't worry 1395 * about the parent being unlocked, as any 1396 * setting is done with allprison_lock held. 1397 */ 1398 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1399 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1400 break; 1401 if (ij == ppr->pr_ip4s) { 1402 error = EPERM; 1403 goto done_deref_locked; 1404 } 1405 if (ip4s > 1) { 1406 for (ii = ij = 1; ii < ip4s; ii++) { 1407 if (ip4[ii].s_addr == 1408 ppr->pr_ip4[0].s_addr) 1409 continue; 1410 for (; ij < ppr->pr_ip4s; ij++) 1411 if (ip4[ii].s_addr == 1412 ppr->pr_ip4[ij].s_addr) 1413 break; 1414 if (ij == ppr->pr_ip4s) 1415 break; 1416 } 1417 if (ij == ppr->pr_ip4s) { 1418 error = EPERM; 1419 goto done_deref_locked; 1420 } 1421 } 1422 } 1423 /* 1424 * Check for conflicting IP addresses. We permit them 1425 * if there is no more than one IP on each jail. If 1426 * there is a duplicate on a jail with more than one 1427 * IP stop checking and return error. 1428 */ 1429 tppr = ppr; 1430#ifdef VIMAGE 1431 for (; tppr != &prison0; tppr = tppr->pr_parent) 1432 if (tppr->pr_flags & PR_VNET) 1433 break; 1434#endif 1435 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1436 if (tpr == pr || 1437#ifdef VIMAGE 1438 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1439#endif 1440 tpr->pr_uref == 0) { 1441 descend = 0; 1442 continue; 1443 } 1444 if (!(tpr->pr_flags & PR_IP4_USER)) 1445 continue; 1446 descend = 0; 1447 if (tpr->pr_ip4 == NULL || 1448 (ip4s == 1 && tpr->pr_ip4s == 1)) 1449 continue; 1450 for (ii = 0; ii < ip4s; ii++) { 1451 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1452 error = EADDRINUSE; 1453 vfs_opterror(opts, 1454 "IPv4 addresses clash"); 1455 goto done_deref_locked; 1456 } 1457 } 1458 } 1459 } 1460#endif 1461#ifdef INET6 1462 if (ip6s > 0) { 1463 if (ppr->pr_flags & PR_IP6) { 1464 /* 1465 * Make sure the new set of IP addresses is a 1466 * subset of the parent's list. 1467 */ 1468 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1469 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1470 &ppr->pr_ip6[ij])) 1471 break; 1472 if (ij == ppr->pr_ip6s) { 1473 error = EPERM; 1474 goto done_deref_locked; 1475 } 1476 if (ip6s > 1) { 1477 for (ii = ij = 1; ii < ip6s; ii++) { 1478 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1479 &ppr->pr_ip6[0])) 1480 continue; 1481 for (; ij < ppr->pr_ip6s; ij++) 1482 if (IN6_ARE_ADDR_EQUAL( 1483 &ip6[ii], &ppr->pr_ip6[ij])) 1484 break; 1485 if (ij == ppr->pr_ip6s) 1486 break; 1487 } 1488 if (ij == ppr->pr_ip6s) { 1489 error = EPERM; 1490 goto done_deref_locked; 1491 } 1492 } 1493 } 1494 /* Check for conflicting IP addresses. */ 1495 tppr = ppr; 1496#ifdef VIMAGE 1497 for (; tppr != &prison0; tppr = tppr->pr_parent) 1498 if (tppr->pr_flags & PR_VNET) 1499 break; 1500#endif 1501 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1502 if (tpr == pr || 1503#ifdef VIMAGE 1504 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1505#endif 1506 tpr->pr_uref == 0) { 1507 descend = 0; 1508 continue; 1509 } 1510 if (!(tpr->pr_flags & PR_IP6_USER)) 1511 continue; 1512 descend = 0; 1513 if (tpr->pr_ip6 == NULL || 1514 (ip6s == 1 && tpr->pr_ip6s == 1)) 1515 continue; 1516 for (ii = 0; ii < ip6s; ii++) { 1517 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1518 error = EADDRINUSE; 1519 vfs_opterror(opts, 1520 "IPv6 addresses clash"); 1521 goto done_deref_locked; 1522 } 1523 } 1524 } 1525 } 1526#endif 1527 onamelen = namelen = 0; 1528 if (name != NULL) { 1529 /* Give a default name of the jid. */ 1530 if (name[0] == '\0') 1531 snprintf(name = numbuf, sizeof(numbuf), "%d", jid); 1532 else if (*namelc == '0' || (strtoul(namelc, &p, 10) != jid && 1533 *p == '\0')) { 1534 error = EINVAL; 1535 vfs_opterror(opts, 1536 "name cannot be numeric (unless it is the jid)"); 1537 goto done_deref_locked; 1538 } 1539 /* 1540 * Make sure the name isn't too long for the prison or its 1541 * children. 1542 */ 1543 onamelen = strlen(pr->pr_name); 1544 namelen = strlen(name); 1545 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) { 1546 error = ENAMETOOLONG; 1547 goto done_deref_locked; 1548 } 1549 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1550 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1551 sizeof(pr->pr_name)) { 1552 error = ENAMETOOLONG; 1553 goto done_deref_locked; 1554 } 1555 } 1556 } 1557 if (pr_allow & ~ppr->pr_allow) { 1558 error = EPERM; 1559 goto done_deref_locked; 1560 } 1561 1562 /* Set the parameters of the prison. */ 1563#ifdef INET 1564 redo_ip4 = 0; 1565 if (pr_flags & PR_IP4_USER) { 1566 pr->pr_flags |= PR_IP4; 1567 free(pr->pr_ip4, M_PRISON); 1568 pr->pr_ip4s = ip4s; 1569 pr->pr_ip4 = ip4; 1570 ip4 = NULL; 1571 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1572#ifdef VIMAGE 1573 if (tpr->pr_flags & PR_VNET) { 1574 descend = 0; 1575 continue; 1576 } 1577#endif 1578 if (prison_restrict_ip4(tpr, NULL)) { 1579 redo_ip4 = 1; 1580 descend = 0; 1581 } 1582 } 1583 } 1584#endif 1585#ifdef INET6 1586 redo_ip6 = 0; 1587 if (pr_flags & PR_IP6_USER) { 1588 pr->pr_flags |= PR_IP6; 1589 free(pr->pr_ip6, M_PRISON); 1590 pr->pr_ip6s = ip6s; 1591 pr->pr_ip6 = ip6; 1592 ip6 = NULL; 1593 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1594#ifdef VIMAGE 1595 if (tpr->pr_flags & PR_VNET) { 1596 descend = 0; 1597 continue; 1598 } 1599#endif 1600 if (prison_restrict_ip6(tpr, NULL)) { 1601 redo_ip6 = 1; 1602 descend = 0; 1603 } 1604 } 1605 } 1606#endif 1607 if (gotslevel) { 1608 pr->pr_securelevel = slevel; 1609 /* Set all child jails to be at least this level. */ 1610 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1611 if (tpr->pr_securelevel < slevel) 1612 tpr->pr_securelevel = slevel; 1613 } 1614 if (gotchildmax) { 1615 pr->pr_childmax = childmax; 1616 /* Set all child jails to under this limit. */ 1617 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1618 if (tpr->pr_childmax > childmax - level) 1619 tpr->pr_childmax = childmax > level 1620 ? childmax - level : 0; 1621 } 1622 if (gotenforce) { 1623 pr->pr_enforce_statfs = enforce; 1624 /* Pass this restriction on to the children. */ 1625 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1626 if (tpr->pr_enforce_statfs < enforce) 1627 tpr->pr_enforce_statfs = enforce; 1628 } 1629 if (gotrsnum) { 1630 pr->pr_devfs_rsnum = rsnum; 1631 /* Pass this restriction on to the children. */ 1632 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1633 tpr->pr_devfs_rsnum = rsnum; 1634 } 1635 if (name != NULL) { 1636 if (ppr == &prison0) 1637 strlcpy(pr->pr_name, name, sizeof(pr->pr_name)); 1638 else 1639 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1640 ppr->pr_name, name); 1641 /* Change this component of child names. */ 1642 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1643 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1644 strlen(tpr->pr_name + onamelen) + 1); 1645 bcopy(pr->pr_name, tpr->pr_name, namelen); 1646 } 1647 } 1648 if (path != NULL) { 1649 /* Try to keep a real-rooted full pathname. */ 1650 if (fullpath_disabled && path[0] == '/' && 1651 strcmp(mypr->pr_path, "/")) 1652 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1653 mypr->pr_path, path); 1654 else 1655 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1656 pr->pr_root = root; 1657 } 1658 if (PR_HOST & ch_flags & ~pr_flags) { 1659 if (pr->pr_flags & PR_HOST) { 1660 /* 1661 * Copy the parent's host info. As with pr_ip4 above, 1662 * the lack of a lock on the parent is not a problem; 1663 * it is always set with allprison_lock at least 1664 * shared, and is held exclusively here. 1665 */ 1666 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1667 sizeof(pr->pr_hostname)); 1668 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1669 sizeof(pr->pr_domainname)); 1670 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1671 sizeof(pr->pr_hostuuid)); 1672 pr->pr_hostid = pr->pr_parent->pr_hostid; 1673 } 1674 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1675 /* Set this prison, and any descendants without PR_HOST. */ 1676 if (host != NULL) 1677 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1678 if (domain != NULL) 1679 strlcpy(pr->pr_domainname, domain, 1680 sizeof(pr->pr_domainname)); 1681 if (uuid != NULL) 1682 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1683 if (gothid) 1684 pr->pr_hostid = hid; 1685 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1686 if (tpr->pr_flags & PR_HOST) 1687 descend = 0; 1688 else { 1689 if (host != NULL) 1690 strlcpy(tpr->pr_hostname, 1691 pr->pr_hostname, 1692 sizeof(tpr->pr_hostname)); 1693 if (domain != NULL) 1694 strlcpy(tpr->pr_domainname, 1695 pr->pr_domainname, 1696 sizeof(tpr->pr_domainname)); 1697 if (uuid != NULL) 1698 strlcpy(tpr->pr_hostuuid, 1699 pr->pr_hostuuid, 1700 sizeof(tpr->pr_hostuuid)); 1701 if (gothid) 1702 tpr->pr_hostid = hid; 1703 } 1704 } 1705 } 1706 if ((tallow = ch_allow & ~pr_allow)) { 1707 /* Clear allow bits in all children. */ 1708 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1709 tpr->pr_allow &= ~tallow; 1710 } 1711 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1712 /* 1713 * Persistent prisons get an extra reference, and prisons losing their 1714 * persist flag lose that reference. Only do this for existing prisons 1715 * for now, so new ones will remain unseen until after the module 1716 * handlers have completed. 1717 */ 1718 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1719 if (pr_flags & PR_PERSIST) { 1720 pr->pr_ref++; 1721 pr->pr_uref++; 1722 } else { 1723 pr->pr_ref--; 1724 pr->pr_uref--; 1725 } 1726 } 1727 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1728 mtx_unlock(&pr->pr_mtx); 1729 1730#ifdef RACCT 1731 if (created) 1732 prison_racct_attach(pr); 1733#endif 1734 1735 /* Locks may have prevented a complete restriction of child IP 1736 * addresses. If so, allocate some more memory and try again. 1737 */ 1738#ifdef INET 1739 while (redo_ip4) { 1740 ip4s = pr->pr_ip4s; 1741 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1742 mtx_lock(&pr->pr_mtx); 1743 redo_ip4 = 0; 1744 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1745#ifdef VIMAGE 1746 if (tpr->pr_flags & PR_VNET) { 1747 descend = 0; 1748 continue; 1749 } 1750#endif 1751 if (prison_restrict_ip4(tpr, ip4)) { 1752 if (ip4 != NULL) 1753 ip4 = NULL; 1754 else 1755 redo_ip4 = 1; 1756 } 1757 } 1758 mtx_unlock(&pr->pr_mtx); 1759 } 1760#endif 1761#ifdef INET6 1762 while (redo_ip6) { 1763 ip6s = pr->pr_ip6s; 1764 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1765 mtx_lock(&pr->pr_mtx); 1766 redo_ip6 = 0; 1767 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1768#ifdef VIMAGE 1769 if (tpr->pr_flags & PR_VNET) { 1770 descend = 0; 1771 continue; 1772 } 1773#endif 1774 if (prison_restrict_ip6(tpr, ip6)) { 1775 if (ip6 != NULL) 1776 ip6 = NULL; 1777 else 1778 redo_ip6 = 1; 1779 } 1780 } 1781 mtx_unlock(&pr->pr_mtx); 1782 } 1783#endif 1784 1785 /* Let the modules do their work. */ 1786 sx_downgrade(&allprison_lock); 1787 if (created) { 1788 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1789 if (error) { 1790 prison_deref(pr, PD_LIST_SLOCKED); 1791 goto done_errmsg; 1792 } 1793 } 1794 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1795 if (error) { 1796 prison_deref(pr, created 1797 ? PD_LIST_SLOCKED 1798 : PD_DEREF | PD_LIST_SLOCKED); 1799 goto done_errmsg; 1800 } 1801 1802 /* Attach this process to the prison if requested. */ 1803 if (flags & JAIL_ATTACH) { 1804 mtx_lock(&pr->pr_mtx); 1805 error = do_jail_attach(td, pr); 1806 if (error) { 1807 vfs_opterror(opts, "attach failed"); 1808 if (!created) 1809 prison_deref(pr, PD_DEREF); 1810 goto done_errmsg; 1811 } 1812 } 1813 1814#ifdef RACCT 1815 if (!created) { 1816 if (!(flags & JAIL_ATTACH)) 1817 sx_sunlock(&allprison_lock); 1818 prison_racct_modify(pr); 1819 if (!(flags & JAIL_ATTACH)) 1820 sx_slock(&allprison_lock); 1821 } 1822#endif 1823 1824 td->td_retval[0] = pr->pr_id; 1825 1826 /* 1827 * Now that it is all there, drop the temporary reference from existing 1828 * prisons. Or add a reference to newly created persistent prisons 1829 * (which was not done earlier so that the prison would not be publicly 1830 * visible). 1831 */ 1832 if (!created) { 1833 prison_deref(pr, (flags & JAIL_ATTACH) 1834 ? PD_DEREF 1835 : PD_DEREF | PD_LIST_SLOCKED); 1836 } else { 1837 if (pr_flags & PR_PERSIST) { 1838 mtx_lock(&pr->pr_mtx); 1839 pr->pr_ref++; 1840 pr->pr_uref++; 1841 mtx_unlock(&pr->pr_mtx); 1842 } 1843 if (!(flags & JAIL_ATTACH)) 1844 sx_sunlock(&allprison_lock); 1845 } 1846 1847 goto done_errmsg; 1848 1849 done_deref_locked: 1850 prison_deref(pr, created 1851 ? PD_LOCKED | PD_LIST_XLOCKED 1852 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1853 goto done_releroot; 1854 done_unlock_list: 1855 sx_xunlock(&allprison_lock); 1856 done_releroot: 1857 if (root != NULL) 1858 vrele(root); 1859 done_errmsg: 1860 if (error) { 1861 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 1862 if (errmsg_len > 0) { 1863 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1864 if (errmsg_pos > 0) { 1865 if (optuio->uio_segflg == UIO_SYSSPACE) 1866 bcopy(errmsg, 1867 optuio->uio_iov[errmsg_pos].iov_base, 1868 errmsg_len); 1869 else 1870 copyout(errmsg, 1871 optuio->uio_iov[errmsg_pos].iov_base, 1872 errmsg_len); 1873 } 1874 } 1875 } 1876 done_free: 1877#ifdef INET 1878 free(ip4, M_PRISON); 1879#endif 1880#ifdef INET6 1881 free(ip6, M_PRISON); 1882#endif 1883 if (g_path != NULL) 1884 free(g_path, M_TEMP); 1885 vfs_freeopts(opts); 1886 return (error); 1887} 1888 1889 1890/* 1891 * struct jail_get_args { 1892 * struct iovec *iovp; 1893 * unsigned int iovcnt; 1894 * int flags; 1895 * }; 1896 */ 1897int 1898sys_jail_get(struct thread *td, struct jail_get_args *uap) 1899{ 1900 struct uio *auio; 1901 int error; 1902 1903 /* Check that we have an even number of iovecs. */ 1904 if (uap->iovcnt & 1) 1905 return (EINVAL); 1906 1907 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1908 if (error) 1909 return (error); 1910 error = kern_jail_get(td, auio, uap->flags); 1911 if (error == 0) 1912 error = copyout(auio->uio_iov, uap->iovp, 1913 uap->iovcnt * sizeof (struct iovec)); 1914 free(auio, M_IOV); 1915 return (error); 1916} 1917 1918int 1919kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1920{ 1921 struct prison *pr, *mypr; 1922 struct vfsopt *opt; 1923 struct vfsoptlist *opts; 1924 char *errmsg, *name; 1925 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1926 1927 if (flags & ~JAIL_GET_MASK) 1928 return (EINVAL); 1929 1930 /* Get the parameter list. */ 1931 error = vfs_buildopts(optuio, &opts); 1932 if (error) 1933 return (error); 1934 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1935 mypr = td->td_ucred->cr_prison; 1936 1937 /* 1938 * Find the prison specified by one of: lastjid, jid, name. 1939 */ 1940 sx_slock(&allprison_lock); 1941 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1942 if (error == 0) { 1943 TAILQ_FOREACH(pr, &allprison, pr_list) { 1944 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1945 mtx_lock(&pr->pr_mtx); 1946 if (pr->pr_ref > 0 && 1947 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1948 break; 1949 mtx_unlock(&pr->pr_mtx); 1950 } 1951 } 1952 if (pr != NULL) 1953 goto found_prison; 1954 error = ENOENT; 1955 vfs_opterror(opts, "no jail after %d", jid); 1956 goto done_unlock_list; 1957 } else if (error != ENOENT) 1958 goto done_unlock_list; 1959 1960 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1961 if (error == 0) { 1962 if (jid != 0) { 1963 pr = prison_find_child(mypr, jid); 1964 if (pr != NULL) { 1965 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1966 mtx_unlock(&pr->pr_mtx); 1967 error = ENOENT; 1968 vfs_opterror(opts, "jail %d is dying", 1969 jid); 1970 goto done_unlock_list; 1971 } 1972 goto found_prison; 1973 } 1974 error = ENOENT; 1975 vfs_opterror(opts, "jail %d not found", jid); 1976 goto done_unlock_list; 1977 } 1978 } else if (error != ENOENT) 1979 goto done_unlock_list; 1980 1981 error = vfs_getopt(opts, "name", (void **)&name, &len); 1982 if (error == 0) { 1983 if (len == 0 || name[len - 1] != '\0') { 1984 error = EINVAL; 1985 goto done_unlock_list; 1986 } 1987 pr = prison_find_name(mypr, name); 1988 if (pr != NULL) { 1989 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1990 mtx_unlock(&pr->pr_mtx); 1991 error = ENOENT; 1992 vfs_opterror(opts, "jail \"%s\" is dying", 1993 name); 1994 goto done_unlock_list; 1995 } 1996 goto found_prison; 1997 } 1998 error = ENOENT; 1999 vfs_opterror(opts, "jail \"%s\" not found", name); 2000 goto done_unlock_list; 2001 } else if (error != ENOENT) 2002 goto done_unlock_list; 2003 2004 vfs_opterror(opts, "no jail specified"); 2005 error = ENOENT; 2006 goto done_unlock_list; 2007 2008 found_prison: 2009 /* Get the parameters of the prison. */ 2010 pr->pr_ref++; 2011 locked = PD_LOCKED; 2012 td->td_retval[0] = pr->pr_id; 2013 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 2014 if (error != 0 && error != ENOENT) 2015 goto done_deref; 2016 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 2017 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 2018 if (error != 0 && error != ENOENT) 2019 goto done_deref; 2020 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 2021 if (error != 0 && error != ENOENT) 2022 goto done_deref; 2023 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 2024 sizeof(pr->pr_cpuset->cs_id)); 2025 if (error != 0 && error != ENOENT) 2026 goto done_deref; 2027 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 2028 if (error != 0 && error != ENOENT) 2029 goto done_deref; 2030#ifdef INET 2031 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 2032 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2033 if (error != 0 && error != ENOENT) 2034 goto done_deref; 2035#endif 2036#ifdef INET6 2037 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 2038 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2039 if (error != 0 && error != ENOENT) 2040 goto done_deref; 2041#endif 2042 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 2043 sizeof(pr->pr_securelevel)); 2044 if (error != 0 && error != ENOENT) 2045 goto done_deref; 2046 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 2047 sizeof(pr->pr_childcount)); 2048 if (error != 0 && error != ENOENT) 2049 goto done_deref; 2050 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 2051 sizeof(pr->pr_childmax)); 2052 if (error != 0 && error != ENOENT) 2053 goto done_deref; 2054 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 2055 if (error != 0 && error != ENOENT) 2056 goto done_deref; 2057 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 2058 if (error != 0 && error != ENOENT) 2059 goto done_deref; 2060 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 2061 if (error != 0 && error != ENOENT) 2062 goto done_deref; 2063#ifdef COMPAT_FREEBSD32 2064 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2065 uint32_t hid32 = pr->pr_hostid; 2066 2067 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2068 } else 2069#endif 2070 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2071 sizeof(pr->pr_hostid)); 2072 if (error != 0 && error != ENOENT) 2073 goto done_deref; 2074 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2075 sizeof(pr->pr_enforce_statfs)); 2076 if (error != 0 && error != ENOENT) 2077 goto done_deref; 2078 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum, 2079 sizeof(pr->pr_devfs_rsnum)); 2080 if (error != 0 && error != ENOENT) 2081 goto done_deref; 2082 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 2083 fi++) { 2084 if (pr_flag_names[fi] == NULL) 2085 continue; 2086 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 2087 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 2088 if (error != 0 && error != ENOENT) 2089 goto done_deref; 2090 i = !i; 2091 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 2092 if (error != 0 && error != ENOENT) 2093 goto done_deref; 2094 } 2095 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 2096 fi++) { 2097 i = pr->pr_flags & 2098 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2099 i = pr_flag_jailsys[fi].disable && 2100 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2101 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2102 : JAIL_SYS_INHERIT; 2103 error = 2104 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2105 if (error != 0 && error != ENOENT) 2106 goto done_deref; 2107 } 2108 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 2109 fi++) { 2110 if (pr_allow_names[fi] == NULL) 2111 continue; 2112 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2113 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2114 if (error != 0 && error != ENOENT) 2115 goto done_deref; 2116 i = !i; 2117 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2118 if (error != 0 && error != ENOENT) 2119 goto done_deref; 2120 } 2121 i = (pr->pr_uref == 0); 2122 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2123 if (error != 0 && error != ENOENT) 2124 goto done_deref; 2125 i = !i; 2126 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2127 if (error != 0 && error != ENOENT) 2128 goto done_deref; 2129 2130 /* Get the module parameters. */ 2131 mtx_unlock(&pr->pr_mtx); 2132 locked = 0; 2133 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2134 if (error) 2135 goto done_deref; 2136 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2137 2138 /* By now, all parameters should have been noted. */ 2139 TAILQ_FOREACH(opt, opts, link) { 2140 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2141 error = EINVAL; 2142 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2143 goto done_errmsg; 2144 } 2145 } 2146 2147 /* Write the fetched parameters back to userspace. */ 2148 error = 0; 2149 TAILQ_FOREACH(opt, opts, link) { 2150 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2151 pos = 2 * opt->pos + 1; 2152 optuio->uio_iov[pos].iov_len = opt->len; 2153 if (opt->value != NULL) { 2154 if (optuio->uio_segflg == UIO_SYSSPACE) { 2155 bcopy(opt->value, 2156 optuio->uio_iov[pos].iov_base, 2157 opt->len); 2158 } else { 2159 error = copyout(opt->value, 2160 optuio->uio_iov[pos].iov_base, 2161 opt->len); 2162 if (error) 2163 break; 2164 } 2165 } 2166 } 2167 } 2168 goto done_errmsg; 2169 2170 done_deref: 2171 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2172 goto done_errmsg; 2173 2174 done_unlock_list: 2175 sx_sunlock(&allprison_lock); 2176 done_errmsg: 2177 if (error && errmsg_pos >= 0) { 2178 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2179 errmsg_pos = 2 * errmsg_pos + 1; 2180 if (errmsg_len > 0) { 2181 if (optuio->uio_segflg == UIO_SYSSPACE) 2182 bcopy(errmsg, 2183 optuio->uio_iov[errmsg_pos].iov_base, 2184 errmsg_len); 2185 else 2186 copyout(errmsg, 2187 optuio->uio_iov[errmsg_pos].iov_base, 2188 errmsg_len); 2189 } 2190 } 2191 vfs_freeopts(opts); 2192 return (error); 2193} 2194 2195 2196/* 2197 * struct jail_remove_args { 2198 * int jid; 2199 * }; 2200 */ 2201int 2202sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2203{ 2204 struct prison *pr, *cpr, *lpr, *tpr; 2205 int descend, error; 2206 2207 error = priv_check(td, PRIV_JAIL_REMOVE); 2208 if (error) 2209 return (error); 2210 2211 sx_xlock(&allprison_lock); 2212 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2213 if (pr == NULL) { 2214 sx_xunlock(&allprison_lock); 2215 return (EINVAL); 2216 } 2217 2218 /* Remove all descendants of this prison, then remove this prison. */ 2219 pr->pr_ref++; 2220 pr->pr_flags |= PR_REMOVE; 2221 if (!LIST_EMPTY(&pr->pr_children)) { 2222 mtx_unlock(&pr->pr_mtx); 2223 lpr = NULL; 2224 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2225 mtx_lock(&cpr->pr_mtx); 2226 if (cpr->pr_ref > 0) { 2227 tpr = cpr; 2228 cpr->pr_ref++; 2229 cpr->pr_flags |= PR_REMOVE; 2230 } else { 2231 /* Already removed - do not do it again. */ 2232 tpr = NULL; 2233 } 2234 mtx_unlock(&cpr->pr_mtx); 2235 if (lpr != NULL) { 2236 mtx_lock(&lpr->pr_mtx); 2237 prison_remove_one(lpr); 2238 sx_xlock(&allprison_lock); 2239 } 2240 lpr = tpr; 2241 } 2242 if (lpr != NULL) { 2243 mtx_lock(&lpr->pr_mtx); 2244 prison_remove_one(lpr); 2245 sx_xlock(&allprison_lock); 2246 } 2247 mtx_lock(&pr->pr_mtx); 2248 } 2249 prison_remove_one(pr); 2250 return (0); 2251} 2252 2253static void 2254prison_remove_one(struct prison *pr) 2255{ 2256 struct proc *p; 2257 int deuref; 2258 2259 /* If the prison was persistent, it is not anymore. */ 2260 deuref = 0; 2261 if (pr->pr_flags & PR_PERSIST) { 2262 pr->pr_ref--; 2263 deuref = PD_DEUREF; 2264 pr->pr_flags &= ~PR_PERSIST; 2265 } 2266 2267 /* 2268 * jail_remove added a reference. If that's the only one, remove 2269 * the prison now. 2270 */ 2271 KASSERT(pr->pr_ref > 0, 2272 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2273 if (pr->pr_ref == 1) { 2274 prison_deref(pr, 2275 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2276 return; 2277 } 2278 2279 mtx_unlock(&pr->pr_mtx); 2280 sx_xunlock(&allprison_lock); 2281 /* 2282 * Kill all processes unfortunate enough to be attached to this prison. 2283 */ 2284 sx_slock(&allproc_lock); 2285 LIST_FOREACH(p, &allproc, p_list) { 2286 PROC_LOCK(p); 2287 if (p->p_state != PRS_NEW && p->p_ucred && 2288 p->p_ucred->cr_prison == pr) 2289 kern_psignal(p, SIGKILL); 2290 PROC_UNLOCK(p); 2291 } 2292 sx_sunlock(&allproc_lock); 2293 /* Remove the temporary reference added by jail_remove. */ 2294 prison_deref(pr, deuref | PD_DEREF); 2295} 2296 2297 2298/* 2299 * struct jail_attach_args { 2300 * int jid; 2301 * }; 2302 */ 2303int 2304sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2305{ 2306 struct prison *pr; 2307 int error; 2308 2309 error = priv_check(td, PRIV_JAIL_ATTACH); 2310 if (error) 2311 return (error); 2312 2313 sx_slock(&allprison_lock); 2314 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2315 if (pr == NULL) { 2316 sx_sunlock(&allprison_lock); 2317 return (EINVAL); 2318 } 2319 2320 /* 2321 * Do not allow a process to attach to a prison that is not 2322 * considered to be "alive". 2323 */ 2324 if (pr->pr_uref == 0) { 2325 mtx_unlock(&pr->pr_mtx); 2326 sx_sunlock(&allprison_lock); 2327 return (EINVAL); 2328 } 2329 2330 return (do_jail_attach(td, pr)); 2331} 2332 2333static int 2334do_jail_attach(struct thread *td, struct prison *pr) 2335{ 2336 struct prison *ppr; 2337 struct proc *p; 2338 struct ucred *newcred, *oldcred; 2339 int error; 2340 2341 /* 2342 * XXX: Note that there is a slight race here if two threads 2343 * in the same privileged process attempt to attach to two 2344 * different jails at the same time. It is important for 2345 * user processes not to do this, or they might end up with 2346 * a process root from one prison, but attached to the jail 2347 * of another. 2348 */ 2349 pr->pr_ref++; 2350 pr->pr_uref++; 2351 mtx_unlock(&pr->pr_mtx); 2352 2353 /* Let modules do whatever they need to prepare for attaching. */ 2354 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2355 if (error) { 2356 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2357 return (error); 2358 } 2359 sx_sunlock(&allprison_lock); 2360 2361 /* 2362 * Reparent the newly attached process to this jail. 2363 */ 2364 ppr = td->td_ucred->cr_prison; 2365 p = td->td_proc; 2366 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2367 if (error) 2368 goto e_revert_osd; 2369 2370 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2371 if ((error = change_dir(pr->pr_root, td)) != 0) 2372 goto e_unlock; 2373#ifdef MAC 2374 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2375 goto e_unlock; 2376#endif 2377 VOP_UNLOCK(pr->pr_root, 0); 2378 if ((error = change_root(pr->pr_root, td))) 2379 goto e_revert_osd; 2380 2381 newcred = crget(); 2382 PROC_LOCK(p); 2383 oldcred = p->p_ucred; 2384 setsugid(p); 2385 crcopy(newcred, oldcred); 2386 newcred->cr_prison = pr; 2387 p->p_ucred = newcred; 2388 PROC_UNLOCK(p); 2389#ifdef RACCT 2390 racct_proc_ucred_changed(p, oldcred, newcred); 2391#endif 2392 crfree(oldcred); 2393 prison_deref(ppr, PD_DEREF | PD_DEUREF); 2394 return (0); 2395 e_unlock: 2396 VOP_UNLOCK(pr->pr_root, 0); 2397 e_revert_osd: 2398 /* Tell modules this thread is still in its old jail after all. */ 2399 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td); 2400 prison_deref(pr, PD_DEREF | PD_DEUREF); 2401 return (error); 2402} 2403 2404 2405/* 2406 * Returns a locked prison instance, or NULL on failure. 2407 */ 2408struct prison * 2409prison_find(int prid) 2410{ 2411 struct prison *pr; 2412 2413 sx_assert(&allprison_lock, SX_LOCKED); 2414 TAILQ_FOREACH(pr, &allprison, pr_list) { 2415 if (pr->pr_id == prid) { 2416 mtx_lock(&pr->pr_mtx); 2417 if (pr->pr_ref > 0) 2418 return (pr); 2419 mtx_unlock(&pr->pr_mtx); 2420 } 2421 } 2422 return (NULL); 2423} 2424 2425/* 2426 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2427 */ 2428struct prison * 2429prison_find_child(struct prison *mypr, int prid) 2430{ 2431 struct prison *pr; 2432 int descend; 2433 2434 sx_assert(&allprison_lock, SX_LOCKED); 2435 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2436 if (pr->pr_id == prid) { 2437 mtx_lock(&pr->pr_mtx); 2438 if (pr->pr_ref > 0) 2439 return (pr); 2440 mtx_unlock(&pr->pr_mtx); 2441 } 2442 } 2443 return (NULL); 2444} 2445 2446/* 2447 * Look for the name relative to mypr. Returns a locked prison or NULL. 2448 */ 2449struct prison * 2450prison_find_name(struct prison *mypr, const char *name) 2451{ 2452 struct prison *pr, *deadpr; 2453 size_t mylen; 2454 int descend; 2455 2456 sx_assert(&allprison_lock, SX_LOCKED); 2457 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2458 again: 2459 deadpr = NULL; 2460 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2461 if (!strcmp(pr->pr_name + mylen, name)) { 2462 mtx_lock(&pr->pr_mtx); 2463 if (pr->pr_ref > 0) { 2464 if (pr->pr_uref > 0) 2465 return (pr); 2466 deadpr = pr; 2467 } 2468 mtx_unlock(&pr->pr_mtx); 2469 } 2470 } 2471 /* There was no valid prison - perhaps there was a dying one. */ 2472 if (deadpr != NULL) { 2473 mtx_lock(&deadpr->pr_mtx); 2474 if (deadpr->pr_ref == 0) { 2475 mtx_unlock(&deadpr->pr_mtx); 2476 goto again; 2477 } 2478 } 2479 return (deadpr); 2480} 2481 2482/* 2483 * See if a prison has the specific flag set. 2484 */ 2485int 2486prison_flag(struct ucred *cred, unsigned flag) 2487{ 2488 2489 /* This is an atomic read, so no locking is necessary. */ 2490 return (cred->cr_prison->pr_flags & flag); 2491} 2492 2493int 2494prison_allow(struct ucred *cred, unsigned flag) 2495{ 2496 2497 /* This is an atomic read, so no locking is necessary. */ 2498 return (cred->cr_prison->pr_allow & flag); 2499} 2500 2501/* 2502 * Remove a prison reference. If that was the last reference, remove the 2503 * prison itself - but not in this context in case there are locks held. 2504 */ 2505void 2506prison_free_locked(struct prison *pr) 2507{ 2508 2509 mtx_assert(&pr->pr_mtx, MA_OWNED); 2510 pr->pr_ref--; 2511 if (pr->pr_ref == 0) { 2512 mtx_unlock(&pr->pr_mtx); 2513 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 2514 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2515 return; 2516 } 2517 mtx_unlock(&pr->pr_mtx); 2518} 2519 2520void 2521prison_free(struct prison *pr) 2522{ 2523 2524 mtx_lock(&pr->pr_mtx); 2525 prison_free_locked(pr); 2526} 2527 2528static void 2529prison_complete(void *context, int pending) 2530{ 2531 2532 prison_deref((struct prison *)context, 0); 2533} 2534 2535/* 2536 * Remove a prison reference (usually). This internal version assumes no 2537 * mutexes are held, except perhaps the prison itself. If there are no more 2538 * references, release and delist the prison. On completion, the prison lock 2539 * and the allprison lock are both unlocked. 2540 */ 2541static void 2542prison_deref(struct prison *pr, int flags) 2543{ 2544 struct prison *ppr, *tpr; 2545 2546 if (!(flags & PD_LOCKED)) 2547 mtx_lock(&pr->pr_mtx); 2548 for (;;) { 2549 if (flags & PD_DEUREF) { 2550 pr->pr_uref--; 2551 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2552 } 2553 if (flags & PD_DEREF) 2554 pr->pr_ref--; 2555 /* If the prison still has references, nothing else to do. */ 2556 if (pr->pr_ref > 0) { 2557 mtx_unlock(&pr->pr_mtx); 2558 if (flags & PD_LIST_SLOCKED) 2559 sx_sunlock(&allprison_lock); 2560 else if (flags & PD_LIST_XLOCKED) 2561 sx_xunlock(&allprison_lock); 2562 return; 2563 } 2564 2565 mtx_unlock(&pr->pr_mtx); 2566 if (flags & PD_LIST_SLOCKED) { 2567 if (!sx_try_upgrade(&allprison_lock)) { 2568 sx_sunlock(&allprison_lock); 2569 sx_xlock(&allprison_lock); 2570 } 2571 } else if (!(flags & PD_LIST_XLOCKED)) 2572 sx_xlock(&allprison_lock); 2573 2574 TAILQ_REMOVE(&allprison, pr, pr_list); 2575 LIST_REMOVE(pr, pr_sibling); 2576 ppr = pr->pr_parent; 2577 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2578 tpr->pr_childcount--; 2579 sx_xunlock(&allprison_lock); 2580 2581#ifdef VIMAGE 2582 if (pr->pr_vnet != ppr->pr_vnet) 2583 vnet_destroy(pr->pr_vnet); 2584#endif 2585 if (pr->pr_root != NULL) 2586 vrele(pr->pr_root); 2587 mtx_destroy(&pr->pr_mtx); 2588#ifdef INET 2589 free(pr->pr_ip4, M_PRISON); 2590#endif 2591#ifdef INET6 2592 free(pr->pr_ip6, M_PRISON); 2593#endif 2594 if (pr->pr_cpuset != NULL) 2595 cpuset_rel(pr->pr_cpuset); 2596 osd_jail_exit(pr); 2597#ifdef RACCT 2598 prison_racct_detach(pr); 2599#endif 2600 free(pr, M_PRISON); 2601 2602 /* Removing a prison frees a reference on its parent. */ 2603 pr = ppr; 2604 mtx_lock(&pr->pr_mtx); 2605 flags = PD_DEREF | PD_DEUREF; 2606 } 2607} 2608 2609void 2610prison_hold_locked(struct prison *pr) 2611{ 2612 2613 mtx_assert(&pr->pr_mtx, MA_OWNED); 2614 KASSERT(pr->pr_ref > 0, 2615 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2616 pr->pr_ref++; 2617} 2618 2619void 2620prison_hold(struct prison *pr) 2621{ 2622 2623 mtx_lock(&pr->pr_mtx); 2624 prison_hold_locked(pr); 2625 mtx_unlock(&pr->pr_mtx); 2626} 2627 2628void 2629prison_proc_hold(struct prison *pr) 2630{ 2631 2632 mtx_lock(&pr->pr_mtx); 2633 KASSERT(pr->pr_uref > 0, 2634 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2635 pr->pr_uref++; 2636 mtx_unlock(&pr->pr_mtx); 2637} 2638 2639void 2640prison_proc_free(struct prison *pr) 2641{ 2642 2643 mtx_lock(&pr->pr_mtx); 2644 KASSERT(pr->pr_uref > 0, 2645 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2646 prison_deref(pr, PD_DEUREF | PD_LOCKED); 2647} 2648 2649 2650#ifdef INET 2651/* 2652 * Restrict a prison's IP address list with its parent's, possibly replacing 2653 * it. Return true if the replacement buffer was used (or would have been). 2654 */ 2655static int 2656prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2657{ 2658 int ii, ij, used; 2659 struct prison *ppr; 2660 2661 ppr = pr->pr_parent; 2662 if (!(pr->pr_flags & PR_IP4_USER)) { 2663 /* This has no user settings, so just copy the parent's list. */ 2664 if (pr->pr_ip4s < ppr->pr_ip4s) { 2665 /* 2666 * There's no room for the parent's list. Use the 2667 * new list buffer, which is assumed to be big enough 2668 * (if it was passed). If there's no buffer, try to 2669 * allocate one. 2670 */ 2671 used = 1; 2672 if (newip4 == NULL) { 2673 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2674 M_PRISON, M_NOWAIT); 2675 if (newip4 != NULL) 2676 used = 0; 2677 } 2678 if (newip4 != NULL) { 2679 bcopy(ppr->pr_ip4, newip4, 2680 ppr->pr_ip4s * sizeof(*newip4)); 2681 free(pr->pr_ip4, M_PRISON); 2682 pr->pr_ip4 = newip4; 2683 pr->pr_ip4s = ppr->pr_ip4s; 2684 } 2685 return (used); 2686 } 2687 pr->pr_ip4s = ppr->pr_ip4s; 2688 if (pr->pr_ip4s > 0) 2689 bcopy(ppr->pr_ip4, pr->pr_ip4, 2690 pr->pr_ip4s * sizeof(*newip4)); 2691 else if (pr->pr_ip4 != NULL) { 2692 free(pr->pr_ip4, M_PRISON); 2693 pr->pr_ip4 = NULL; 2694 } 2695 } else if (pr->pr_ip4s > 0) { 2696 /* Remove addresses that aren't in the parent. */ 2697 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2698 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2699 break; 2700 if (ij < ppr->pr_ip4s) 2701 ii = 1; 2702 else { 2703 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2704 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2705 ii = 0; 2706 } 2707 for (ij = 1; ii < pr->pr_ip4s; ) { 2708 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2709 ii++; 2710 continue; 2711 } 2712 switch (ij >= ppr->pr_ip4s ? -1 : 2713 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2714 case -1: 2715 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2716 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2717 break; 2718 case 0: 2719 ii++; 2720 ij++; 2721 break; 2722 case 1: 2723 ij++; 2724 break; 2725 } 2726 } 2727 if (pr->pr_ip4s == 0) { 2728 pr->pr_flags |= PR_IP4_DISABLE; 2729 free(pr->pr_ip4, M_PRISON); 2730 pr->pr_ip4 = NULL; 2731 } 2732 } 2733 return (0); 2734} 2735 2736/* 2737 * Pass back primary IPv4 address of this jail. 2738 * 2739 * If not restricted return success but do not alter the address. Caller has 2740 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2741 * 2742 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2743 * Address returned in NBO. 2744 */ 2745int 2746prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2747{ 2748 struct prison *pr; 2749 2750 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2751 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2752 2753 pr = cred->cr_prison; 2754 if (!(pr->pr_flags & PR_IP4)) 2755 return (0); 2756 mtx_lock(&pr->pr_mtx); 2757 if (!(pr->pr_flags & PR_IP4)) { 2758 mtx_unlock(&pr->pr_mtx); 2759 return (0); 2760 } 2761 if (pr->pr_ip4 == NULL) { 2762 mtx_unlock(&pr->pr_mtx); 2763 return (EAFNOSUPPORT); 2764 } 2765 2766 ia->s_addr = pr->pr_ip4[0].s_addr; 2767 mtx_unlock(&pr->pr_mtx); 2768 return (0); 2769} 2770 2771/* 2772 * Return 1 if we should do proper source address selection or are not jailed. 2773 * We will return 0 if we should bypass source address selection in favour 2774 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2775 * returned in NBO. 2776 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2777 */ 2778int 2779prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2780{ 2781 struct prison *pr; 2782 struct in_addr lia; 2783 int error; 2784 2785 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2786 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2787 2788 if (!jailed(cred)) 2789 return (1); 2790 2791 pr = cred->cr_prison; 2792 if (pr->pr_flags & PR_IP4_SADDRSEL) 2793 return (1); 2794 2795 lia.s_addr = INADDR_ANY; 2796 error = prison_get_ip4(cred, &lia); 2797 if (error) 2798 return (error); 2799 if (lia.s_addr == INADDR_ANY) 2800 return (1); 2801 2802 ia->s_addr = lia.s_addr; 2803 return (0); 2804} 2805 2806/* 2807 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2808 */ 2809int 2810prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2811{ 2812 2813 if (pr1 == pr2) 2814 return (1); 2815 2816 /* 2817 * No need to lock since the PR_IP4_USER flag can't be altered for 2818 * existing prisons. 2819 */ 2820 while (pr1 != &prison0 && 2821#ifdef VIMAGE 2822 !(pr1->pr_flags & PR_VNET) && 2823#endif 2824 !(pr1->pr_flags & PR_IP4_USER)) 2825 pr1 = pr1->pr_parent; 2826 while (pr2 != &prison0 && 2827#ifdef VIMAGE 2828 !(pr2->pr_flags & PR_VNET) && 2829#endif 2830 !(pr2->pr_flags & PR_IP4_USER)) 2831 pr2 = pr2->pr_parent; 2832 return (pr1 == pr2); 2833} 2834 2835/* 2836 * Make sure our (source) address is set to something meaningful to this 2837 * jail. 2838 * 2839 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2840 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2841 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2842 */ 2843int 2844prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2845{ 2846 struct prison *pr; 2847 struct in_addr ia0; 2848 int error; 2849 2850 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2851 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2852 2853 pr = cred->cr_prison; 2854 if (!(pr->pr_flags & PR_IP4)) 2855 return (0); 2856 mtx_lock(&pr->pr_mtx); 2857 if (!(pr->pr_flags & PR_IP4)) { 2858 mtx_unlock(&pr->pr_mtx); 2859 return (0); 2860 } 2861 if (pr->pr_ip4 == NULL) { 2862 mtx_unlock(&pr->pr_mtx); 2863 return (EAFNOSUPPORT); 2864 } 2865 2866 ia0.s_addr = ntohl(ia->s_addr); 2867 if (ia0.s_addr == INADDR_LOOPBACK) { 2868 ia->s_addr = pr->pr_ip4[0].s_addr; 2869 mtx_unlock(&pr->pr_mtx); 2870 return (0); 2871 } 2872 2873 if (ia0.s_addr == INADDR_ANY) { 2874 /* 2875 * In case there is only 1 IPv4 address, bind directly. 2876 */ 2877 if (pr->pr_ip4s == 1) 2878 ia->s_addr = pr->pr_ip4[0].s_addr; 2879 mtx_unlock(&pr->pr_mtx); 2880 return (0); 2881 } 2882 2883 error = _prison_check_ip4(pr, ia); 2884 mtx_unlock(&pr->pr_mtx); 2885 return (error); 2886} 2887 2888/* 2889 * Rewrite destination address in case we will connect to loopback address. 2890 * 2891 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2892 * Address passed in in NBO and returned in NBO. 2893 */ 2894int 2895prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 2896{ 2897 struct prison *pr; 2898 2899 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2900 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2901 2902 pr = cred->cr_prison; 2903 if (!(pr->pr_flags & PR_IP4)) 2904 return (0); 2905 mtx_lock(&pr->pr_mtx); 2906 if (!(pr->pr_flags & PR_IP4)) { 2907 mtx_unlock(&pr->pr_mtx); 2908 return (0); 2909 } 2910 if (pr->pr_ip4 == NULL) { 2911 mtx_unlock(&pr->pr_mtx); 2912 return (EAFNOSUPPORT); 2913 } 2914 2915 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 2916 ia->s_addr = pr->pr_ip4[0].s_addr; 2917 mtx_unlock(&pr->pr_mtx); 2918 return (0); 2919 } 2920 2921 /* 2922 * Return success because nothing had to be changed. 2923 */ 2924 mtx_unlock(&pr->pr_mtx); 2925 return (0); 2926} 2927 2928/* 2929 * Check if given address belongs to the jail referenced by cred/prison. 2930 * 2931 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2932 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2933 * doesn't allow IPv4. Address passed in in NBO. 2934 */ 2935static int 2936_prison_check_ip4(struct prison *pr, struct in_addr *ia) 2937{ 2938 int i, a, z, d; 2939 2940 /* 2941 * Check the primary IP. 2942 */ 2943 if (pr->pr_ip4[0].s_addr == ia->s_addr) 2944 return (0); 2945 2946 /* 2947 * All the other IPs are sorted so we can do a binary search. 2948 */ 2949 a = 0; 2950 z = pr->pr_ip4s - 2; 2951 while (a <= z) { 2952 i = (a + z) / 2; 2953 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 2954 if (d > 0) 2955 z = i - 1; 2956 else if (d < 0) 2957 a = i + 1; 2958 else 2959 return (0); 2960 } 2961 2962 return (EADDRNOTAVAIL); 2963} 2964 2965int 2966prison_check_ip4(struct ucred *cred, struct in_addr *ia) 2967{ 2968 struct prison *pr; 2969 int error; 2970 2971 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2972 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2973 2974 pr = cred->cr_prison; 2975 if (!(pr->pr_flags & PR_IP4)) 2976 return (0); 2977 mtx_lock(&pr->pr_mtx); 2978 if (!(pr->pr_flags & PR_IP4)) { 2979 mtx_unlock(&pr->pr_mtx); 2980 return (0); 2981 } 2982 if (pr->pr_ip4 == NULL) { 2983 mtx_unlock(&pr->pr_mtx); 2984 return (EAFNOSUPPORT); 2985 } 2986 2987 error = _prison_check_ip4(pr, ia); 2988 mtx_unlock(&pr->pr_mtx); 2989 return (error); 2990} 2991#endif 2992 2993#ifdef INET6 2994static int 2995prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 2996{ 2997 int ii, ij, used; 2998 struct prison *ppr; 2999 3000 ppr = pr->pr_parent; 3001 if (!(pr->pr_flags & PR_IP6_USER)) { 3002 /* This has no user settings, so just copy the parent's list. */ 3003 if (pr->pr_ip6s < ppr->pr_ip6s) { 3004 /* 3005 * There's no room for the parent's list. Use the 3006 * new list buffer, which is assumed to be big enough 3007 * (if it was passed). If there's no buffer, try to 3008 * allocate one. 3009 */ 3010 used = 1; 3011 if (newip6 == NULL) { 3012 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 3013 M_PRISON, M_NOWAIT); 3014 if (newip6 != NULL) 3015 used = 0; 3016 } 3017 if (newip6 != NULL) { 3018 bcopy(ppr->pr_ip6, newip6, 3019 ppr->pr_ip6s * sizeof(*newip6)); 3020 free(pr->pr_ip6, M_PRISON); 3021 pr->pr_ip6 = newip6; 3022 pr->pr_ip6s = ppr->pr_ip6s; 3023 } 3024 return (used); 3025 } 3026 pr->pr_ip6s = ppr->pr_ip6s; 3027 if (pr->pr_ip6s > 0) 3028 bcopy(ppr->pr_ip6, pr->pr_ip6, 3029 pr->pr_ip6s * sizeof(*newip6)); 3030 else if (pr->pr_ip6 != NULL) { 3031 free(pr->pr_ip6, M_PRISON); 3032 pr->pr_ip6 = NULL; 3033 } 3034 } else if (pr->pr_ip6s > 0) { 3035 /* Remove addresses that aren't in the parent. */ 3036 for (ij = 0; ij < ppr->pr_ip6s; ij++) 3037 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 3038 &ppr->pr_ip6[ij])) 3039 break; 3040 if (ij < ppr->pr_ip6s) 3041 ii = 1; 3042 else { 3043 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 3044 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 3045 ii = 0; 3046 } 3047 for (ij = 1; ii < pr->pr_ip6s; ) { 3048 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 3049 &ppr->pr_ip6[0])) { 3050 ii++; 3051 continue; 3052 } 3053 switch (ij >= ppr->pr_ip6s ? -1 : 3054 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 3055 case -1: 3056 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 3057 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 3058 break; 3059 case 0: 3060 ii++; 3061 ij++; 3062 break; 3063 case 1: 3064 ij++; 3065 break; 3066 } 3067 } 3068 if (pr->pr_ip6s == 0) { 3069 pr->pr_flags |= PR_IP6_DISABLE; 3070 free(pr->pr_ip6, M_PRISON); 3071 pr->pr_ip6 = NULL; 3072 } 3073 } 3074 return 0; 3075} 3076 3077/* 3078 * Pass back primary IPv6 address for this jail. 3079 * 3080 * If not restricted return success but do not alter the address. Caller has 3081 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3082 * 3083 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3084 */ 3085int 3086prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3087{ 3088 struct prison *pr; 3089 3090 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3091 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3092 3093 pr = cred->cr_prison; 3094 if (!(pr->pr_flags & PR_IP6)) 3095 return (0); 3096 mtx_lock(&pr->pr_mtx); 3097 if (!(pr->pr_flags & PR_IP6)) { 3098 mtx_unlock(&pr->pr_mtx); 3099 return (0); 3100 } 3101 if (pr->pr_ip6 == NULL) { 3102 mtx_unlock(&pr->pr_mtx); 3103 return (EAFNOSUPPORT); 3104 } 3105 3106 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3107 mtx_unlock(&pr->pr_mtx); 3108 return (0); 3109} 3110 3111/* 3112 * Return 1 if we should do proper source address selection or are not jailed. 3113 * We will return 0 if we should bypass source address selection in favour 3114 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3115 * returned in NBO. 3116 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3117 */ 3118int 3119prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3120{ 3121 struct prison *pr; 3122 struct in6_addr lia6; 3123 int error; 3124 3125 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3126 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3127 3128 if (!jailed(cred)) 3129 return (1); 3130 3131 pr = cred->cr_prison; 3132 if (pr->pr_flags & PR_IP6_SADDRSEL) 3133 return (1); 3134 3135 lia6 = in6addr_any; 3136 error = prison_get_ip6(cred, &lia6); 3137 if (error) 3138 return (error); 3139 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3140 return (1); 3141 3142 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3143 return (0); 3144} 3145 3146/* 3147 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3148 */ 3149int 3150prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3151{ 3152 3153 if (pr1 == pr2) 3154 return (1); 3155 3156 while (pr1 != &prison0 && 3157#ifdef VIMAGE 3158 !(pr1->pr_flags & PR_VNET) && 3159#endif 3160 !(pr1->pr_flags & PR_IP6_USER)) 3161 pr1 = pr1->pr_parent; 3162 while (pr2 != &prison0 && 3163#ifdef VIMAGE 3164 !(pr2->pr_flags & PR_VNET) && 3165#endif 3166 !(pr2->pr_flags & PR_IP6_USER)) 3167 pr2 = pr2->pr_parent; 3168 return (pr1 == pr2); 3169} 3170 3171/* 3172 * Make sure our (source) address is set to something meaningful to this jail. 3173 * 3174 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3175 * when needed while binding. 3176 * 3177 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3178 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3179 * doesn't allow IPv6. 3180 */ 3181int 3182prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3183{ 3184 struct prison *pr; 3185 int error; 3186 3187 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3188 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3189 3190 pr = cred->cr_prison; 3191 if (!(pr->pr_flags & PR_IP6)) 3192 return (0); 3193 mtx_lock(&pr->pr_mtx); 3194 if (!(pr->pr_flags & PR_IP6)) { 3195 mtx_unlock(&pr->pr_mtx); 3196 return (0); 3197 } 3198 if (pr->pr_ip6 == NULL) { 3199 mtx_unlock(&pr->pr_mtx); 3200 return (EAFNOSUPPORT); 3201 } 3202 3203 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3204 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3205 mtx_unlock(&pr->pr_mtx); 3206 return (0); 3207 } 3208 3209 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3210 /* 3211 * In case there is only 1 IPv6 address, and v6only is true, 3212 * then bind directly. 3213 */ 3214 if (v6only != 0 && pr->pr_ip6s == 1) 3215 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3216 mtx_unlock(&pr->pr_mtx); 3217 return (0); 3218 } 3219 3220 error = _prison_check_ip6(pr, ia6); 3221 mtx_unlock(&pr->pr_mtx); 3222 return (error); 3223} 3224 3225/* 3226 * Rewrite destination address in case we will connect to loopback address. 3227 * 3228 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3229 */ 3230int 3231prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3232{ 3233 struct prison *pr; 3234 3235 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3236 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3237 3238 pr = cred->cr_prison; 3239 if (!(pr->pr_flags & PR_IP6)) 3240 return (0); 3241 mtx_lock(&pr->pr_mtx); 3242 if (!(pr->pr_flags & PR_IP6)) { 3243 mtx_unlock(&pr->pr_mtx); 3244 return (0); 3245 } 3246 if (pr->pr_ip6 == NULL) { 3247 mtx_unlock(&pr->pr_mtx); 3248 return (EAFNOSUPPORT); 3249 } 3250 3251 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3252 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3253 mtx_unlock(&pr->pr_mtx); 3254 return (0); 3255 } 3256 3257 /* 3258 * Return success because nothing had to be changed. 3259 */ 3260 mtx_unlock(&pr->pr_mtx); 3261 return (0); 3262} 3263 3264/* 3265 * Check if given address belongs to the jail referenced by cred/prison. 3266 * 3267 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3268 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3269 * doesn't allow IPv6. 3270 */ 3271static int 3272_prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3273{ 3274 int i, a, z, d; 3275 3276 /* 3277 * Check the primary IP. 3278 */ 3279 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3280 return (0); 3281 3282 /* 3283 * All the other IPs are sorted so we can do a binary search. 3284 */ 3285 a = 0; 3286 z = pr->pr_ip6s - 2; 3287 while (a <= z) { 3288 i = (a + z) / 2; 3289 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3290 if (d > 0) 3291 z = i - 1; 3292 else if (d < 0) 3293 a = i + 1; 3294 else 3295 return (0); 3296 } 3297 3298 return (EADDRNOTAVAIL); 3299} 3300 3301int 3302prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3303{ 3304 struct prison *pr; 3305 int error; 3306 3307 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3308 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3309 3310 pr = cred->cr_prison; 3311 if (!(pr->pr_flags & PR_IP6)) 3312 return (0); 3313 mtx_lock(&pr->pr_mtx); 3314 if (!(pr->pr_flags & PR_IP6)) { 3315 mtx_unlock(&pr->pr_mtx); 3316 return (0); 3317 } 3318 if (pr->pr_ip6 == NULL) { 3319 mtx_unlock(&pr->pr_mtx); 3320 return (EAFNOSUPPORT); 3321 } 3322 3323 error = _prison_check_ip6(pr, ia6); 3324 mtx_unlock(&pr->pr_mtx); 3325 return (error); 3326} 3327#endif 3328 3329/* 3330 * Check if a jail supports the given address family. 3331 * 3332 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3333 * if not. 3334 */ 3335int 3336prison_check_af(struct ucred *cred, int af) 3337{ 3338 struct prison *pr; 3339 int error; 3340 3341 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3342 3343 pr = cred->cr_prison; 3344#ifdef VIMAGE 3345 /* Prisons with their own network stack are not limited. */ 3346 if (prison_owns_vnet(cred)) 3347 return (0); 3348#endif 3349 3350 error = 0; 3351 switch (af) 3352 { 3353#ifdef INET 3354 case AF_INET: 3355 if (pr->pr_flags & PR_IP4) 3356 { 3357 mtx_lock(&pr->pr_mtx); 3358 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3359 error = EAFNOSUPPORT; 3360 mtx_unlock(&pr->pr_mtx); 3361 } 3362 break; 3363#endif 3364#ifdef INET6 3365 case AF_INET6: 3366 if (pr->pr_flags & PR_IP6) 3367 { 3368 mtx_lock(&pr->pr_mtx); 3369 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3370 error = EAFNOSUPPORT; 3371 mtx_unlock(&pr->pr_mtx); 3372 } 3373 break; 3374#endif 3375 case AF_LOCAL: 3376 case AF_ROUTE: 3377 break; 3378 default: 3379 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3380 error = EAFNOSUPPORT; 3381 } 3382 return (error); 3383} 3384 3385/* 3386 * Check if given address belongs to the jail referenced by cred (wrapper to 3387 * prison_check_ip[46]). 3388 * 3389 * Returns 0 if jail doesn't restrict the address family or if address belongs 3390 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3391 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3392 */ 3393int 3394prison_if(struct ucred *cred, struct sockaddr *sa) 3395{ 3396#ifdef INET 3397 struct sockaddr_in *sai; 3398#endif 3399#ifdef INET6 3400 struct sockaddr_in6 *sai6; 3401#endif 3402 int error; 3403 3404 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3405 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3406 3407#ifdef VIMAGE 3408 if (prison_owns_vnet(cred)) 3409 return (0); 3410#endif 3411 3412 error = 0; 3413 switch (sa->sa_family) 3414 { 3415#ifdef INET 3416 case AF_INET: 3417 sai = (struct sockaddr_in *)sa; 3418 error = prison_check_ip4(cred, &sai->sin_addr); 3419 break; 3420#endif 3421#ifdef INET6 3422 case AF_INET6: 3423 sai6 = (struct sockaddr_in6 *)sa; 3424 error = prison_check_ip6(cred, &sai6->sin6_addr); 3425 break; 3426#endif 3427 default: 3428 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3429 error = EAFNOSUPPORT; 3430 } 3431 return (error); 3432} 3433 3434/* 3435 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3436 */ 3437int 3438prison_check(struct ucred *cred1, struct ucred *cred2) 3439{ 3440 3441 return ((cred1->cr_prison == cred2->cr_prison || 3442 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3443} 3444 3445/* 3446 * Return 1 if p2 is a child of p1, otherwise 0. 3447 */ 3448int 3449prison_ischild(struct prison *pr1, struct prison *pr2) 3450{ 3451 3452 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3453 if (pr1 == pr2) 3454 return (1); 3455 return (0); 3456} 3457 3458/* 3459 * Return 1 if the passed credential is in a jail, otherwise 0. 3460 */ 3461int 3462jailed(struct ucred *cred) 3463{ 3464 3465 return (cred->cr_prison != &prison0); 3466} 3467 3468/* 3469 * Return 1 if the passed credential is in a jail and that jail does not 3470 * have its own virtual network stack, otherwise 0. 3471 */ 3472int 3473jailed_without_vnet(struct ucred *cred) 3474{ 3475 3476 if (!jailed(cred)) 3477 return (0); 3478#ifdef VIMAGE 3479 if (prison_owns_vnet(cred)) 3480 return (0); 3481#endif 3482 3483 return (1); 3484} 3485 3486/* 3487 * Return the correct hostname (domainname, et al) for the passed credential. 3488 */ 3489void 3490getcredhostname(struct ucred *cred, char *buf, size_t size) 3491{ 3492 struct prison *pr; 3493 3494 /* 3495 * A NULL credential can be used to shortcut to the physical 3496 * system's hostname. 3497 */ 3498 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3499 mtx_lock(&pr->pr_mtx); 3500 strlcpy(buf, pr->pr_hostname, size); 3501 mtx_unlock(&pr->pr_mtx); 3502} 3503 3504void 3505getcreddomainname(struct ucred *cred, char *buf, size_t size) 3506{ 3507 3508 mtx_lock(&cred->cr_prison->pr_mtx); 3509 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3510 mtx_unlock(&cred->cr_prison->pr_mtx); 3511} 3512 3513void 3514getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3515{ 3516 3517 mtx_lock(&cred->cr_prison->pr_mtx); 3518 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3519 mtx_unlock(&cred->cr_prison->pr_mtx); 3520} 3521 3522void 3523getcredhostid(struct ucred *cred, unsigned long *hostid) 3524{ 3525 3526 mtx_lock(&cred->cr_prison->pr_mtx); 3527 *hostid = cred->cr_prison->pr_hostid; 3528 mtx_unlock(&cred->cr_prison->pr_mtx); 3529} 3530 3531#ifdef VIMAGE 3532/* 3533 * Determine whether the prison represented by cred owns 3534 * its vnet rather than having it inherited. 3535 * 3536 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3537 */ 3538int 3539prison_owns_vnet(struct ucred *cred) 3540{ 3541 3542 /* 3543 * vnets cannot be added/removed after jail creation, 3544 * so no need to lock here. 3545 */ 3546 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3547} 3548#endif 3549 3550/* 3551 * Determine whether the subject represented by cred can "see" 3552 * status of a mount point. 3553 * Returns: 0 for permitted, ENOENT otherwise. 3554 * XXX: This function should be called cr_canseemount() and should be 3555 * placed in kern_prot.c. 3556 */ 3557int 3558prison_canseemount(struct ucred *cred, struct mount *mp) 3559{ 3560 struct prison *pr; 3561 struct statfs *sp; 3562 size_t len; 3563 3564 pr = cred->cr_prison; 3565 if (pr->pr_enforce_statfs == 0) 3566 return (0); 3567 if (pr->pr_root->v_mount == mp) 3568 return (0); 3569 if (pr->pr_enforce_statfs == 2) 3570 return (ENOENT); 3571 /* 3572 * If jail's chroot directory is set to "/" we should be able to see 3573 * all mount-points from inside a jail. 3574 * This is ugly check, but this is the only situation when jail's 3575 * directory ends with '/'. 3576 */ 3577 if (strcmp(pr->pr_path, "/") == 0) 3578 return (0); 3579 len = strlen(pr->pr_path); 3580 sp = &mp->mnt_stat; 3581 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3582 return (ENOENT); 3583 /* 3584 * Be sure that we don't have situation where jail's root directory 3585 * is "/some/path" and mount point is "/some/pathpath". 3586 */ 3587 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3588 return (ENOENT); 3589 return (0); 3590} 3591 3592void 3593prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3594{ 3595 char jpath[MAXPATHLEN]; 3596 struct prison *pr; 3597 size_t len; 3598 3599 pr = cred->cr_prison; 3600 if (pr->pr_enforce_statfs == 0) 3601 return; 3602 if (prison_canseemount(cred, mp) != 0) { 3603 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3604 strlcpy(sp->f_mntonname, "[restricted]", 3605 sizeof(sp->f_mntonname)); 3606 return; 3607 } 3608 if (pr->pr_root->v_mount == mp) { 3609 /* 3610 * Clear current buffer data, so we are sure nothing from 3611 * the valid path left there. 3612 */ 3613 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3614 *sp->f_mntonname = '/'; 3615 return; 3616 } 3617 /* 3618 * If jail's chroot directory is set to "/" we should be able to see 3619 * all mount-points from inside a jail. 3620 */ 3621 if (strcmp(pr->pr_path, "/") == 0) 3622 return; 3623 len = strlen(pr->pr_path); 3624 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3625 /* 3626 * Clear current buffer data, so we are sure nothing from 3627 * the valid path left there. 3628 */ 3629 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3630 if (*jpath == '\0') { 3631 /* Should never happen. */ 3632 *sp->f_mntonname = '/'; 3633 } else { 3634 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3635 } 3636} 3637 3638/* 3639 * Check with permission for a specific privilege is granted within jail. We 3640 * have a specific list of accepted privileges; the rest are denied. 3641 */ 3642int 3643prison_priv_check(struct ucred *cred, int priv) 3644{ 3645 3646 if (!jailed(cred)) 3647 return (0); 3648 3649#ifdef VIMAGE 3650 /* 3651 * Privileges specific to prisons with a virtual network stack. 3652 * There might be a duplicate entry here in case the privilege 3653 * is only granted conditionally in the legacy jail case. 3654 */ 3655 switch (priv) { 3656#ifdef notyet 3657 /* 3658 * NFS-specific privileges. 3659 */ 3660 case PRIV_NFS_DAEMON: 3661 case PRIV_NFS_LOCKD: 3662#endif 3663 /* 3664 * Network stack privileges. 3665 */ 3666 case PRIV_NET_BRIDGE: 3667 case PRIV_NET_GRE: 3668 case PRIV_NET_BPF: 3669 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3670 case PRIV_NET_ROUTE: 3671 case PRIV_NET_TAP: 3672 case PRIV_NET_SETIFMTU: 3673 case PRIV_NET_SETIFFLAGS: 3674 case PRIV_NET_SETIFCAP: 3675 case PRIV_NET_SETIFDESCR: 3676 case PRIV_NET_SETIFNAME : 3677 case PRIV_NET_SETIFMETRIC: 3678 case PRIV_NET_SETIFPHYS: 3679 case PRIV_NET_SETIFMAC: 3680 case PRIV_NET_ADDMULTI: 3681 case PRIV_NET_DELMULTI: 3682 case PRIV_NET_HWIOCTL: 3683 case PRIV_NET_SETLLADDR: 3684 case PRIV_NET_ADDIFGROUP: 3685 case PRIV_NET_DELIFGROUP: 3686 case PRIV_NET_IFCREATE: 3687 case PRIV_NET_IFDESTROY: 3688 case PRIV_NET_ADDIFADDR: 3689 case PRIV_NET_DELIFADDR: 3690 case PRIV_NET_LAGG: 3691 case PRIV_NET_GIF: 3692 case PRIV_NET_SETIFVNET: 3693 case PRIV_NET_SETIFFIB: 3694 3695 /* 3696 * 802.11-related privileges. 3697 */ 3698 case PRIV_NET80211_GETKEY: 3699#ifdef notyet 3700 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3701#endif 3702 3703#ifdef notyet 3704 /* 3705 * AppleTalk privileges. 3706 */ 3707 case PRIV_NETATALK_RESERVEDPORT: 3708 3709 /* 3710 * ATM privileges. 3711 */ 3712 case PRIV_NETATM_CFG: 3713 case PRIV_NETATM_ADD: 3714 case PRIV_NETATM_DEL: 3715 case PRIV_NETATM_SET: 3716 3717 /* 3718 * Bluetooth privileges. 3719 */ 3720 case PRIV_NETBLUETOOTH_RAW: 3721#endif 3722 3723 /* 3724 * Netgraph and netgraph module privileges. 3725 */ 3726 case PRIV_NETGRAPH_CONTROL: 3727#ifdef notyet 3728 case PRIV_NETGRAPH_TTY: 3729#endif 3730 3731 /* 3732 * IPv4 and IPv6 privileges. 3733 */ 3734 case PRIV_NETINET_IPFW: 3735 case PRIV_NETINET_DIVERT: 3736 case PRIV_NETINET_PF: 3737 case PRIV_NETINET_DUMMYNET: 3738 case PRIV_NETINET_CARP: 3739 case PRIV_NETINET_MROUTE: 3740 case PRIV_NETINET_RAW: 3741 case PRIV_NETINET_ADDRCTRL6: 3742 case PRIV_NETINET_ND6: 3743 case PRIV_NETINET_SCOPE6: 3744 case PRIV_NETINET_ALIFETIME6: 3745 case PRIV_NETINET_IPSEC: 3746 case PRIV_NETINET_BINDANY: 3747 3748#ifdef notyet 3749 /* 3750 * IPX/SPX privileges. 3751 */ 3752 case PRIV_NETIPX_RESERVEDPORT: 3753 case PRIV_NETIPX_RAW: 3754 3755 /* 3756 * NCP privileges. 3757 */ 3758 case PRIV_NETNCP: 3759 3760 /* 3761 * SMB privileges. 3762 */ 3763 case PRIV_NETSMB: 3764#endif 3765 3766 /* 3767 * No default: or deny here. 3768 * In case of no permit fall through to next switch(). 3769 */ 3770 if (cred->cr_prison->pr_flags & PR_VNET) 3771 return (0); 3772 } 3773#endif /* VIMAGE */ 3774 3775 switch (priv) { 3776 3777 /* 3778 * Allow ktrace privileges for root in jail. 3779 */ 3780 case PRIV_KTRACE: 3781 3782#if 0 3783 /* 3784 * Allow jailed processes to configure audit identity and 3785 * submit audit records (login, etc). In the future we may 3786 * want to further refine the relationship between audit and 3787 * jail. 3788 */ 3789 case PRIV_AUDIT_GETAUDIT: 3790 case PRIV_AUDIT_SETAUDIT: 3791 case PRIV_AUDIT_SUBMIT: 3792#endif 3793 3794 /* 3795 * Allow jailed processes to manipulate process UNIX 3796 * credentials in any way they see fit. 3797 */ 3798 case PRIV_CRED_SETUID: 3799 case PRIV_CRED_SETEUID: 3800 case PRIV_CRED_SETGID: 3801 case PRIV_CRED_SETEGID: 3802 case PRIV_CRED_SETGROUPS: 3803 case PRIV_CRED_SETREUID: 3804 case PRIV_CRED_SETREGID: 3805 case PRIV_CRED_SETRESUID: 3806 case PRIV_CRED_SETRESGID: 3807 3808 /* 3809 * Jail implements visibility constraints already, so allow 3810 * jailed root to override uid/gid-based constraints. 3811 */ 3812 case PRIV_SEEOTHERGIDS: 3813 case PRIV_SEEOTHERUIDS: 3814 3815 /* 3816 * Jail implements inter-process debugging limits already, so 3817 * allow jailed root various debugging privileges. 3818 */ 3819 case PRIV_DEBUG_DIFFCRED: 3820 case PRIV_DEBUG_SUGID: 3821 case PRIV_DEBUG_UNPRIV: 3822 3823 /* 3824 * Allow jail to set various resource limits and login 3825 * properties, and for now, exceed process resource limits. 3826 */ 3827 case PRIV_PROC_LIMIT: 3828 case PRIV_PROC_SETLOGIN: 3829 case PRIV_PROC_SETRLIMIT: 3830 3831 /* 3832 * System V and POSIX IPC privileges are granted in jail. 3833 */ 3834 case PRIV_IPC_READ: 3835 case PRIV_IPC_WRITE: 3836 case PRIV_IPC_ADMIN: 3837 case PRIV_IPC_MSGSIZE: 3838 case PRIV_MQ_ADMIN: 3839 3840 /* 3841 * Jail operations within a jail work on child jails. 3842 */ 3843 case PRIV_JAIL_ATTACH: 3844 case PRIV_JAIL_SET: 3845 case PRIV_JAIL_REMOVE: 3846 3847 /* 3848 * Jail implements its own inter-process limits, so allow 3849 * root processes in jail to change scheduling on other 3850 * processes in the same jail. Likewise for signalling. 3851 */ 3852 case PRIV_SCHED_DIFFCRED: 3853 case PRIV_SCHED_CPUSET: 3854 case PRIV_SIGNAL_DIFFCRED: 3855 case PRIV_SIGNAL_SUGID: 3856 3857 /* 3858 * Allow jailed processes to write to sysctls marked as jail 3859 * writable. 3860 */ 3861 case PRIV_SYSCTL_WRITEJAIL: 3862 3863 /* 3864 * Allow root in jail to manage a variety of quota 3865 * properties. These should likely be conditional on a 3866 * configuration option. 3867 */ 3868 case PRIV_VFS_GETQUOTA: 3869 case PRIV_VFS_SETQUOTA: 3870 3871 /* 3872 * Since Jail relies on chroot() to implement file system 3873 * protections, grant many VFS privileges to root in jail. 3874 * Be careful to exclude mount-related and NFS-related 3875 * privileges. 3876 */ 3877 case PRIV_VFS_READ: 3878 case PRIV_VFS_WRITE: 3879 case PRIV_VFS_ADMIN: 3880 case PRIV_VFS_EXEC: 3881 case PRIV_VFS_LOOKUP: 3882 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3883 case PRIV_VFS_CHFLAGS_DEV: 3884 case PRIV_VFS_CHOWN: 3885 case PRIV_VFS_CHROOT: 3886 case PRIV_VFS_RETAINSUGID: 3887 case PRIV_VFS_FCHROOT: 3888 case PRIV_VFS_LINK: 3889 case PRIV_VFS_SETGID: 3890 case PRIV_VFS_STAT: 3891 case PRIV_VFS_STICKYFILE: 3892 3893 /* 3894 * As in the non-jail case, non-root users are expected to be 3895 * able to read kernel/phyiscal memory (provided /dev/[k]mem 3896 * exists in the jail and they have permission to access it). 3897 */ 3898 case PRIV_KMEM_READ: 3899 return (0); 3900 3901 /* 3902 * Depending on the global setting, allow privilege of 3903 * setting system flags. 3904 */ 3905 case PRIV_VFS_SYSFLAGS: 3906 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3907 return (0); 3908 else 3909 return (EPERM); 3910 3911 /* 3912 * Depending on the global setting, allow privilege of 3913 * mounting/unmounting file systems. 3914 */ 3915 case PRIV_VFS_MOUNT: 3916 case PRIV_VFS_UNMOUNT: 3917 case PRIV_VFS_MOUNT_NONUSER: 3918 case PRIV_VFS_MOUNT_OWNER: 3919 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3920 cred->cr_prison->pr_enforce_statfs < 2) 3921 return (0); 3922 else 3923 return (EPERM); 3924 3925 /* 3926 * Allow jailed root to bind reserved ports and reuse in-use 3927 * ports. 3928 */ 3929 case PRIV_NETINET_RESERVEDPORT: 3930 case PRIV_NETINET_REUSEPORT: 3931 return (0); 3932 3933 /* 3934 * Allow jailed root to set certian IPv4/6 (option) headers. 3935 */ 3936 case PRIV_NETINET_SETHDROPTS: 3937 return (0); 3938 3939 /* 3940 * Conditionally allow creating raw sockets in jail. 3941 */ 3942 case PRIV_NETINET_RAW: 3943 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3944 return (0); 3945 else 3946 return (EPERM); 3947 3948 /* 3949 * Since jail implements its own visibility limits on netstat 3950 * sysctls, allow getcred. This allows identd to work in 3951 * jail. 3952 */ 3953 case PRIV_NETINET_GETCRED: 3954 return (0); 3955 3956 /* 3957 * Allow jailed root to set loginclass. 3958 */ 3959 case PRIV_PROC_SETLOGINCLASS: 3960 return (0); 3961 3962 default: 3963 /* 3964 * In all remaining cases, deny the privilege request. This 3965 * includes almost all network privileges, many system 3966 * configuration privileges. 3967 */ 3968 return (EPERM); 3969 } 3970} 3971 3972/* 3973 * Return the part of pr2's name that is relative to pr1, or the whole name 3974 * if it does not directly follow. 3975 */ 3976 3977char * 3978prison_name(struct prison *pr1, struct prison *pr2) 3979{ 3980 char *name; 3981 3982 /* Jails see themselves as "0" (if they see themselves at all). */ 3983 if (pr1 == pr2) 3984 return "0"; 3985 name = pr2->pr_name; 3986 if (prison_ischild(pr1, pr2)) { 3987 /* 3988 * pr1 isn't locked (and allprison_lock may not be either) 3989 * so its length can't be counted on. But the number of dots 3990 * can be counted on - and counted. 3991 */ 3992 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3993 name = strchr(name, '.') + 1; 3994 } 3995 return (name); 3996} 3997 3998/* 3999 * Return the part of pr2's path that is relative to pr1, or the whole path 4000 * if it does not directly follow. 4001 */ 4002static char * 4003prison_path(struct prison *pr1, struct prison *pr2) 4004{ 4005 char *path1, *path2; 4006 int len1; 4007 4008 path1 = pr1->pr_path; 4009 path2 = pr2->pr_path; 4010 if (!strcmp(path1, "/")) 4011 return (path2); 4012 len1 = strlen(path1); 4013 if (strncmp(path1, path2, len1)) 4014 return (path2); 4015 if (path2[len1] == '\0') 4016 return "/"; 4017 if (path2[len1] == '/') 4018 return (path2 + len1); 4019 return (path2); 4020} 4021 4022 4023/* 4024 * Jail-related sysctls. 4025 */ 4026static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 4027 "Jails"); 4028 4029static int 4030sysctl_jail_list(SYSCTL_HANDLER_ARGS) 4031{ 4032 struct xprison *xp; 4033 struct prison *pr, *cpr; 4034#ifdef INET 4035 struct in_addr *ip4 = NULL; 4036 int ip4s = 0; 4037#endif 4038#ifdef INET6 4039 struct in6_addr *ip6 = NULL; 4040 int ip6s = 0; 4041#endif 4042 int descend, error; 4043 4044 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 4045 pr = req->td->td_ucred->cr_prison; 4046 error = 0; 4047 sx_slock(&allprison_lock); 4048 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 4049#if defined(INET) || defined(INET6) 4050 again: 4051#endif 4052 mtx_lock(&cpr->pr_mtx); 4053#ifdef INET 4054 if (cpr->pr_ip4s > 0) { 4055 if (ip4s < cpr->pr_ip4s) { 4056 ip4s = cpr->pr_ip4s; 4057 mtx_unlock(&cpr->pr_mtx); 4058 ip4 = realloc(ip4, ip4s * 4059 sizeof(struct in_addr), M_TEMP, M_WAITOK); 4060 goto again; 4061 } 4062 bcopy(cpr->pr_ip4, ip4, 4063 cpr->pr_ip4s * sizeof(struct in_addr)); 4064 } 4065#endif 4066#ifdef INET6 4067 if (cpr->pr_ip6s > 0) { 4068 if (ip6s < cpr->pr_ip6s) { 4069 ip6s = cpr->pr_ip6s; 4070 mtx_unlock(&cpr->pr_mtx); 4071 ip6 = realloc(ip6, ip6s * 4072 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 4073 goto again; 4074 } 4075 bcopy(cpr->pr_ip6, ip6, 4076 cpr->pr_ip6s * sizeof(struct in6_addr)); 4077 } 4078#endif 4079 if (cpr->pr_ref == 0) { 4080 mtx_unlock(&cpr->pr_mtx); 4081 continue; 4082 } 4083 bzero(xp, sizeof(*xp)); 4084 xp->pr_version = XPRISON_VERSION; 4085 xp->pr_id = cpr->pr_id; 4086 xp->pr_state = cpr->pr_uref > 0 4087 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 4088 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4089 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4090 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4091#ifdef INET 4092 xp->pr_ip4s = cpr->pr_ip4s; 4093#endif 4094#ifdef INET6 4095 xp->pr_ip6s = cpr->pr_ip6s; 4096#endif 4097 mtx_unlock(&cpr->pr_mtx); 4098 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4099 if (error) 4100 break; 4101#ifdef INET 4102 if (xp->pr_ip4s > 0) { 4103 error = SYSCTL_OUT(req, ip4, 4104 xp->pr_ip4s * sizeof(struct in_addr)); 4105 if (error) 4106 break; 4107 } 4108#endif 4109#ifdef INET6 4110 if (xp->pr_ip6s > 0) { 4111 error = SYSCTL_OUT(req, ip6, 4112 xp->pr_ip6s * sizeof(struct in6_addr)); 4113 if (error) 4114 break; 4115 } 4116#endif 4117 } 4118 sx_sunlock(&allprison_lock); 4119 free(xp, M_TEMP); 4120#ifdef INET 4121 free(ip4, M_TEMP); 4122#endif 4123#ifdef INET6 4124 free(ip6, M_TEMP); 4125#endif 4126 return (error); 4127} 4128 4129SYSCTL_OID(_security_jail, OID_AUTO, list, 4130 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4131 sysctl_jail_list, "S", "List of active jails"); 4132 4133static int 4134sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4135{ 4136 int error, injail; 4137 4138 injail = jailed(req->td->td_ucred); 4139 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4140 4141 return (error); 4142} 4143 4144SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4145 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4146 sysctl_jail_jailed, "I", "Process in jail?"); 4147 4148static int 4149sysctl_jail_vnet(SYSCTL_HANDLER_ARGS) 4150{ 4151 int error, havevnet; 4152#ifdef VIMAGE 4153 struct ucred *cred = req->td->td_ucred; 4154 4155 havevnet = jailed(cred) && prison_owns_vnet(cred); 4156#else 4157 havevnet = 0; 4158#endif 4159 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet)); 4160 4161 return (error); 4162} 4163 4164SYSCTL_PROC(_security_jail, OID_AUTO, vnet, 4165 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4166 sysctl_jail_vnet, "I", "Jail owns VNET?"); 4167 4168#if defined(INET) || defined(INET6) 4169SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4170 &jail_max_af_ips, 0, 4171 "Number of IP addresses a jail may have at most per address family"); 4172#endif 4173 4174/* 4175 * Default parameters for jail(2) compatability. For historical reasons, 4176 * the sysctl names have varying similarity to the parameter names. Prisons 4177 * just see their own parameters, and can't change them. 4178 */ 4179static int 4180sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4181{ 4182 struct prison *pr; 4183 int allow, error, i; 4184 4185 pr = req->td->td_ucred->cr_prison; 4186 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4187 4188 /* Get the current flag value, and convert it to a boolean. */ 4189 i = (allow & arg2) ? 1 : 0; 4190 if (arg1 != NULL) 4191 i = !i; 4192 error = sysctl_handle_int(oidp, &i, 0, req); 4193 if (error || !req->newptr) 4194 return (error); 4195 i = i ? arg2 : 0; 4196 if (arg1 != NULL) 4197 i ^= arg2; 4198 /* 4199 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4200 * for writing. 4201 */ 4202 mtx_lock(&prison0.pr_mtx); 4203 jail_default_allow = (jail_default_allow & ~arg2) | i; 4204 mtx_unlock(&prison0.pr_mtx); 4205 return (0); 4206} 4207 4208SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4209 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4210 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4211 "Processes in jail can set their hostnames"); 4212SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4213 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4214 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4215 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 4216SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4217 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4218 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4219 "Processes in jail can use System V IPC primitives"); 4220SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4221 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4222 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4223 "Prison root can create raw sockets"); 4224SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4225 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4226 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4227 "Processes in jail can alter system file flags"); 4228SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4229 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4230 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4231 "Processes in jail can mount/unmount jail-friendly file systems"); 4232SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed, 4233 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4234 NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I", 4235 "Processes in jail can mount the devfs file system"); 4236SYSCTL_PROC(_security_jail, OID_AUTO, mount_fdescfs_allowed, 4237 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4238 NULL, PR_ALLOW_MOUNT_FDESCFS, sysctl_jail_default_allow, "I", 4239 "Processes in jail can mount the fdescfs file system"); 4240SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed, 4241 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4242 NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I", 4243 "Processes in jail can mount the nullfs file system"); 4244SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed, 4245 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4246 NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I", 4247 "Processes in jail can mount the procfs file system"); 4248SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed, 4249 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4250 NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I", 4251 "Processes in jail can mount the tmpfs file system"); 4252SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed, 4253 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4254 NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I", 4255 "Processes in jail can mount the zfs file system"); 4256 4257static int 4258sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4259{ 4260 struct prison *pr; 4261 int level, error; 4262 4263 pr = req->td->td_ucred->cr_prison; 4264 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4265 error = sysctl_handle_int(oidp, &level, 0, req); 4266 if (error || !req->newptr) 4267 return (error); 4268 *(int *)arg1 = level; 4269 return (0); 4270} 4271 4272SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4273 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4274 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4275 sysctl_jail_default_level, "I", 4276 "Processes in jail cannot see all mounted file systems"); 4277 4278SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset, 4279 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 4280 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum), 4281 sysctl_jail_default_level, "I", 4282 "Ruleset for the devfs filesystem in jail"); 4283 4284/* 4285 * Nodes to describe jail parameters. Maximum length of string parameters 4286 * is returned in the string itself, and the other parameters exist merely 4287 * to make themselves and their types known. 4288 */ 4289SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4290 "Jail parameters"); 4291 4292int 4293sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4294{ 4295 int i; 4296 long l; 4297 size_t s; 4298 char numbuf[12]; 4299 4300 switch (oidp->oid_kind & CTLTYPE) 4301 { 4302 case CTLTYPE_LONG: 4303 case CTLTYPE_ULONG: 4304 l = 0; 4305#ifdef SCTL_MASK32 4306 if (!(req->flags & SCTL_MASK32)) 4307#endif 4308 return (SYSCTL_OUT(req, &l, sizeof(l))); 4309 case CTLTYPE_INT: 4310 case CTLTYPE_UINT: 4311 i = 0; 4312 return (SYSCTL_OUT(req, &i, sizeof(i))); 4313 case CTLTYPE_STRING: 4314 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4315 return 4316 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4317 case CTLTYPE_STRUCT: 4318 s = (size_t)arg2; 4319 return (SYSCTL_OUT(req, &s, sizeof(s))); 4320 } 4321 return (0); 4322} 4323 4324SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4325SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4326SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4327SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4328SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4329 "I", "Jail secure level"); 4330SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4331 "I", "Jail cannot see all mounted file systems"); 4332SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW, 4333 "I", "Ruleset for in-jail devfs mounts"); 4334SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4335 "B", "Jail persistence"); 4336#ifdef VIMAGE 4337SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4338 "E,jailsys", "Virtual network stack"); 4339#endif 4340SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4341 "B", "Jail is in the process of shutting down"); 4342 4343SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4344SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4345 "I", "Current number of child jails"); 4346SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4347 "I", "Maximum number of child jails"); 4348 4349SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4350SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4351 "Jail hostname"); 4352SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4353 "Jail NIS domainname"); 4354SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4355 "Jail host UUID"); 4356SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4357 "LU", "Jail host ID"); 4358 4359SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4360SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4361 4362#ifdef INET 4363SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4364 "Jail IPv4 address virtualization"); 4365SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4366 "S,in_addr,a", "Jail IPv4 addresses"); 4367SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4368 "B", "Do (not) use IPv4 source address selection rather than the " 4369 "primary jail IPv4 address."); 4370#endif 4371#ifdef INET6 4372SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4373 "Jail IPv6 address virtualization"); 4374SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4375 "S,in6_addr,a", "Jail IPv6 addresses"); 4376SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4377 "B", "Do (not) use IPv6 source address selection rather than the " 4378 "primary jail IPv6 address."); 4379#endif 4380 4381SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4382SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4383 "B", "Jail may set hostname"); 4384SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4385 "B", "Jail may use SYSV IPC"); 4386SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4387 "B", "Jail may create raw sockets"); 4388SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4389 "B", "Jail may alter system file flags"); 4390SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4391 "B", "Jail may set file quotas"); 4392SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4393 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4394 4395SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags"); 4396SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW, 4397 "B", "Jail may mount/unmount jail-friendly file systems in general"); 4398SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW, 4399 "B", "Jail may mount the devfs file system"); 4400SYSCTL_JAIL_PARAM(_allow_mount, fdescfs, CTLTYPE_INT | CTLFLAG_RW, 4401 "B", "Jail may mount the fdescfs file system"); 4402SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW, 4403 "B", "Jail may mount the nullfs file system"); 4404SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW, 4405 "B", "Jail may mount the procfs file system"); 4406SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW, 4407 "B", "Jail may mount the tmpfs file system"); 4408SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW, 4409 "B", "Jail may mount the zfs file system"); 4410 4411void 4412prison_racct_foreach(void (*callback)(struct racct *racct, 4413 void *arg2, void *arg3), void *arg2, void *arg3) 4414{ 4415 struct prison_racct *prr; 4416 4417 sx_slock(&allprison_lock); 4418 LIST_FOREACH(prr, &allprison_racct, prr_next) 4419 (callback)(prr->prr_racct, arg2, arg3); 4420 sx_sunlock(&allprison_lock); 4421} 4422 4423static struct prison_racct * 4424prison_racct_find_locked(const char *name) 4425{ 4426 struct prison_racct *prr; 4427 4428 sx_assert(&allprison_lock, SA_XLOCKED); 4429 4430 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4431 return (NULL); 4432 4433 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4434 if (strcmp(name, prr->prr_name) != 0) 4435 continue; 4436 4437 /* Found prison_racct with a matching name? */ 4438 prison_racct_hold(prr); 4439 return (prr); 4440 } 4441 4442 /* Add new prison_racct. */ 4443 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4444 racct_create(&prr->prr_racct); 4445 4446 strcpy(prr->prr_name, name); 4447 refcount_init(&prr->prr_refcount, 1); 4448 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4449 4450 return (prr); 4451} 4452 4453struct prison_racct * 4454prison_racct_find(const char *name) 4455{ 4456 struct prison_racct *prr; 4457 4458 sx_xlock(&allprison_lock); 4459 prr = prison_racct_find_locked(name); 4460 sx_xunlock(&allprison_lock); 4461 return (prr); 4462} 4463 4464void 4465prison_racct_hold(struct prison_racct *prr) 4466{ 4467 4468 refcount_acquire(&prr->prr_refcount); 4469} 4470 4471static void 4472prison_racct_free_locked(struct prison_racct *prr) 4473{ 4474 4475 sx_assert(&allprison_lock, SA_XLOCKED); 4476 4477 if (refcount_release(&prr->prr_refcount)) { 4478 racct_destroy(&prr->prr_racct); 4479 LIST_REMOVE(prr, prr_next); 4480 free(prr, M_PRISON_RACCT); 4481 } 4482} 4483 4484void 4485prison_racct_free(struct prison_racct *prr) 4486{ 4487 int old; 4488 4489 sx_assert(&allprison_lock, SA_UNLOCKED); 4490 4491 old = prr->prr_refcount; 4492 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4493 return; 4494 4495 sx_xlock(&allprison_lock); 4496 prison_racct_free_locked(prr); 4497 sx_xunlock(&allprison_lock); 4498} 4499 4500#ifdef RACCT 4501static void 4502prison_racct_attach(struct prison *pr) 4503{ 4504 struct prison_racct *prr; 4505 4506 sx_assert(&allprison_lock, SA_XLOCKED); 4507 4508 prr = prison_racct_find_locked(pr->pr_name); 4509 KASSERT(prr != NULL, ("cannot find prison_racct")); 4510 4511 pr->pr_prison_racct = prr; 4512} 4513 4514/* 4515 * Handle jail renaming. From the racct point of view, renaming means 4516 * moving from one prison_racct to another. 4517 */ 4518static void 4519prison_racct_modify(struct prison *pr) 4520{ 4521 struct proc *p; 4522 struct ucred *cred; 4523 struct prison_racct *oldprr; 4524 4525 sx_slock(&allproc_lock); 4526 sx_xlock(&allprison_lock); 4527 4528 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) { 4529 sx_xunlock(&allprison_lock); 4530 sx_sunlock(&allproc_lock); 4531 return; 4532 } 4533 4534 oldprr = pr->pr_prison_racct; 4535 pr->pr_prison_racct = NULL; 4536 4537 prison_racct_attach(pr); 4538 4539 /* 4540 * Move resource utilisation records. 4541 */ 4542 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct); 4543 4544 /* 4545 * Force rctl to reattach rules to processes. 4546 */ 4547 FOREACH_PROC_IN_SYSTEM(p) { 4548 PROC_LOCK(p); 4549 cred = crhold(p->p_ucred); 4550 PROC_UNLOCK(p); 4551 racct_proc_ucred_changed(p, cred, cred); 4552 crfree(cred); 4553 } 4554 4555 sx_sunlock(&allproc_lock); 4556 prison_racct_free_locked(oldprr); 4557 sx_xunlock(&allprison_lock); 4558} 4559 4560static void 4561prison_racct_detach(struct prison *pr) 4562{ 4563 4564 sx_assert(&allprison_lock, SA_UNLOCKED); 4565 4566 if (pr->pr_prison_racct == NULL) 4567 return; 4568 prison_racct_free(pr->pr_prison_racct); 4569 pr->pr_prison_racct = NULL; 4570} 4571#endif /* RACCT */ 4572 4573#ifdef DDB 4574 4575static void 4576db_show_prison(struct prison *pr) 4577{ 4578 int fi; 4579#if defined(INET) || defined(INET6) 4580 int ii; 4581#endif 4582 unsigned jsf; 4583#ifdef INET6 4584 char ip6buf[INET6_ADDRSTRLEN]; 4585#endif 4586 4587 db_printf("prison %p:\n", pr); 4588 db_printf(" jid = %d\n", pr->pr_id); 4589 db_printf(" name = %s\n", pr->pr_name); 4590 db_printf(" parent = %p\n", pr->pr_parent); 4591 db_printf(" ref = %d\n", pr->pr_ref); 4592 db_printf(" uref = %d\n", pr->pr_uref); 4593 db_printf(" path = %s\n", pr->pr_path); 4594 db_printf(" cpuset = %d\n", pr->pr_cpuset 4595 ? pr->pr_cpuset->cs_id : -1); 4596#ifdef VIMAGE 4597 db_printf(" vnet = %p\n", pr->pr_vnet); 4598#endif 4599 db_printf(" root = %p\n", pr->pr_root); 4600 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4601 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum); 4602 db_printf(" children.max = %d\n", pr->pr_childmax); 4603 db_printf(" children.cur = %d\n", pr->pr_childcount); 4604 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4605 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4606 db_printf(" flags = 0x%x", pr->pr_flags); 4607 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4608 fi++) 4609 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4610 db_printf(" %s", pr_flag_names[fi]); 4611 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4612 fi++) { 4613 jsf = pr->pr_flags & 4614 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4615 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4616 pr_flag_jailsys[fi].disable && 4617 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4618 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4619 : "inherit"); 4620 } 4621 db_printf(" allow = 0x%x", pr->pr_allow); 4622 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4623 fi++) 4624 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4625 db_printf(" %s", pr_allow_names[fi]); 4626 db_printf("\n"); 4627 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4628 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4629 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4630 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4631 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4632#ifdef INET 4633 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4634 for (ii = 0; ii < pr->pr_ip4s; ii++) 4635 db_printf(" %s %s\n", 4636 ii == 0 ? "ip4.addr =" : " ", 4637 inet_ntoa(pr->pr_ip4[ii])); 4638#endif 4639#ifdef INET6 4640 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4641 for (ii = 0; ii < pr->pr_ip6s; ii++) 4642 db_printf(" %s %s\n", 4643 ii == 0 ? "ip6.addr =" : " ", 4644 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4645#endif 4646} 4647 4648DB_SHOW_COMMAND(prison, db_show_prison_command) 4649{ 4650 struct prison *pr; 4651 4652 if (!have_addr) { 4653 /* 4654 * Show all prisons in the list, and prison0 which is not 4655 * listed. 4656 */ 4657 db_show_prison(&prison0); 4658 if (!db_pager_quit) { 4659 TAILQ_FOREACH(pr, &allprison, pr_list) { 4660 db_show_prison(pr); 4661 if (db_pager_quit) 4662 break; 4663 } 4664 } 4665 return; 4666 } 4667 4668 if (addr == 0) 4669 pr = &prison0; 4670 else { 4671 /* Look for a prison with the ID and with references. */ 4672 TAILQ_FOREACH(pr, &allprison, pr_list) 4673 if (pr->pr_id == addr && pr->pr_ref > 0) 4674 break; 4675 if (pr == NULL) 4676 /* Look again, without requiring a reference. */ 4677 TAILQ_FOREACH(pr, &allprison, pr_list) 4678 if (pr->pr_id == addr) 4679 break; 4680 if (pr == NULL) 4681 /* Assume address points to a valid prison. */ 4682 pr = (struct prison *)addr; 4683 } 4684 db_show_prison(pr); 4685} 4686 4687#endif /* DDB */ 4688