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("$FreeBSD$"); 31 32 #include "opt_compat.h" 33 #include "opt_ddb.h" 34 #include "opt_inet.h" 35 #include "opt_inet6.h" 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/kernel.h> 40 #include <sys/systm.h> 41 #include <sys/errno.h> 42 #include <sys/sysproto.h> 43 #include <sys/malloc.h> 44 #include <sys/osd.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/taskqueue.h> 48 #include <sys/fcntl.h> 49 #include <sys/jail.h> 50 #include <sys/lock.h> 51 #include <sys/mutex.h> 52 #include <sys/racct.h> 53 #include <sys/refcount.h> 54 #include <sys/sx.h> 55 #include <sys/sysent.h> 56 #include <sys/namei.h> 57 #include <sys/mount.h> 58 #include <sys/queue.h> 59 #include <sys/socket.h> 60 #include <sys/syscallsubr.h> 61 #include <sys/sysctl.h> 62 #include <sys/vnode.h> 63 64 #include <net/if.h> 65 #include <net/vnet.h> 66 67 #include <netinet/in.h> 68 69 #ifdef DDB 70 #include <ddb/ddb.h> 71 #ifdef INET6 72 #include <netinet6/in6_var.h> 73 #endif /* INET6 */ 74 #endif /* DDB */ 75 76 #include <security/mac/mac_framework.h> 77 78 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 79 80 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 81 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures"); 82 83 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 84 #ifdef INET 85 #ifdef INET6 86 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 87 #else 88 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 89 #endif 90 #else /* !INET */ 91 #ifdef INET6 92 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 93 #else 94 #define _PR_IP_SADDRSEL 0 95 #endif 96 #endif 97 98 /* prison0 describes what is "real" about the system. */ 99 struct prison prison0 = { 100 .pr_id = 0, 101 .pr_name = "0", 102 .pr_ref = 1, 103 .pr_uref = 1, 104 .pr_path = "/", 105 .pr_securelevel = -1, 106 .pr_childmax = JAIL_MAX, 107 .pr_hostuuid = DEFAULT_HOSTUUID, 108 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 109 #ifdef VIMAGE 110 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 111 #else 112 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 113 #endif 114 .pr_allow = PR_ALLOW_ALL, 115 }; 116 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 117 118 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */ 119 struct sx allprison_lock; 120 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 121 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 122 LIST_HEAD(, prison_racct) allprison_racct; 123 int lastprid = 0; 124 125 static int do_jail_attach(struct thread *td, struct prison *pr); 126 static void prison_complete(void *context, int pending); 127 static void prison_deref(struct prison *pr, int flags); 128 static char *prison_path(struct prison *pr1, struct prison *pr2); 129 static void prison_remove_one(struct prison *pr); 130 #ifdef RACCT 131 static void prison_racct_attach(struct prison *pr); 132 static void prison_racct_detach(struct prison *pr); 133 #endif 134 #ifdef INET 135 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia); 136 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4); 137 #endif 138 #ifdef INET6 139 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6); 140 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6); 141 #endif 142 143 /* Flags for prison_deref */ 144 #define PD_DEREF 0x01 145 #define PD_DEUREF 0x02 146 #define PD_LOCKED 0x04 147 #define PD_LIST_SLOCKED 0x08 148 #define PD_LIST_XLOCKED 0x10 149 150 /* 151 * Parameter names corresponding to PR_* flag values. Size values are for kvm 152 * as we cannot figure out the size of a sparse array, or an array without a 153 * terminating entry. 154 */ 155 static char *pr_flag_names[] = { 156 [0] = "persist", 157 #ifdef INET 158 [7] = "ip4.saddrsel", 159 #endif 160 #ifdef INET6 161 [8] = "ip6.saddrsel", 162 #endif 163 }; 164 const size_t pr_flag_names_size = sizeof(pr_flag_names); 165 166 static char *pr_flag_nonames[] = { 167 [0] = "nopersist", 168 #ifdef INET 169 [7] = "ip4.nosaddrsel", 170 #endif 171 #ifdef INET6 172 [8] = "ip6.nosaddrsel", 173 #endif 174 }; 175 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames); 176 177 struct jailsys_flags { 178 const char *name; 179 unsigned disable; 180 unsigned new; 181 } pr_flag_jailsys[] = { 182 { "host", 0, PR_HOST }, 183 #ifdef VIMAGE 184 { "vnet", 0, PR_VNET }, 185 #endif 186 #ifdef INET 187 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER }, 188 #endif 189 #ifdef INET6 190 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER }, 191 #endif 192 }; 193 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 194 195 static char *pr_allow_names[] = { 196 "allow.set_hostname", 197 "allow.sysvipc", 198 "allow.raw_sockets", 199 "allow.chflags", 200 "allow.mount", 201 "allow.quotas", 202 "allow.socket_af", 203 }; 204 const size_t pr_allow_names_size = sizeof(pr_allow_names); 205 206 static char *pr_allow_nonames[] = { 207 "allow.noset_hostname", 208 "allow.nosysvipc", 209 "allow.noraw_sockets", 210 "allow.nochflags", 211 "allow.nomount", 212 "allow.noquotas", 213 "allow.nosocket_af", 214 }; 215 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames); 216 217 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME 218 #define JAIL_DEFAULT_ENFORCE_STATFS 2 219 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 220 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 221 #if defined(INET) || defined(INET6) 222 static unsigned jail_max_af_ips = 255; 223 #endif 224 225 #ifdef INET 226 static int 227 qcmp_v4(const void *ip1, const void *ip2) 228 { 229 in_addr_t iaa, iab; 230 231 /* 232 * We need to compare in HBO here to get the list sorted as expected 233 * by the result of the code. Sorting NBO addresses gives you 234 * interesting results. If you do not understand, do not try. 235 */ 236 iaa = ntohl(((const struct in_addr *)ip1)->s_addr); 237 iab = ntohl(((const struct in_addr *)ip2)->s_addr); 238 239 /* 240 * Do not simply return the difference of the two numbers, the int is 241 * not wide enough. 242 */ 243 if (iaa > iab) 244 return (1); 245 else if (iaa < iab) 246 return (-1); 247 else 248 return (0); 249 } 250 #endif 251 252 #ifdef INET6 253 static int 254 qcmp_v6(const void *ip1, const void *ip2) 255 { 256 const struct in6_addr *ia6a, *ia6b; 257 int i, rc; 258 259 ia6a = (const struct in6_addr *)ip1; 260 ia6b = (const struct in6_addr *)ip2; 261 262 rc = 0; 263 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { 264 if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) 265 rc = 1; 266 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) 267 rc = -1; 268 } 269 return (rc); 270 } 271 #endif 272 273 /* 274 * struct jail_args { 275 * struct jail *jail; 276 * }; 277 */ 278 int 279 sys_jail(struct thread *td, struct jail_args *uap) 280 { 281 uint32_t version; 282 int error; 283 struct jail j; 284 285 error = copyin(uap->jail, &version, sizeof(uint32_t)); 286 if (error) 287 return (error); 288 289 switch (version) { 290 case 0: 291 { 292 struct jail_v0 j0; 293 294 /* FreeBSD single IPv4 jails. */ 295 bzero(&j, sizeof(struct jail)); 296 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 297 if (error) 298 return (error); 299 j.version = j0.version; 300 j.path = j0.path; 301 j.hostname = j0.hostname; 302 j.ip4s = j0.ip_number; 303 break; 304 } 305 306 case 1: 307 /* 308 * Version 1 was used by multi-IPv4 jail implementations 309 * that never made it into the official kernel. 310 */ 311 return (EINVAL); 312 313 case 2: /* JAIL_API_VERSION */ 314 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 315 error = copyin(uap->jail, &j, sizeof(struct jail)); 316 if (error) 317 return (error); 318 break; 319 320 default: 321 /* Sci-Fi jails are not supported, sorry. */ 322 return (EINVAL); 323 } 324 return (kern_jail(td, &j)); 325 } 326 327 int 328 kern_jail(struct thread *td, struct jail *j) 329 { 330 struct iovec optiov[2 * (4 331 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0]) 332 #ifdef INET 333 + 1 334 #endif 335 #ifdef INET6 336 + 1 337 #endif 338 )]; 339 struct uio opt; 340 char *u_path, *u_hostname, *u_name; 341 #ifdef INET 342 uint32_t ip4s; 343 struct in_addr *u_ip4; 344 #endif 345 #ifdef INET6 346 struct in6_addr *u_ip6; 347 #endif 348 size_t tmplen; 349 int error, enforce_statfs, fi; 350 351 bzero(&optiov, sizeof(optiov)); 352 opt.uio_iov = optiov; 353 opt.uio_iovcnt = 0; 354 opt.uio_offset = -1; 355 opt.uio_resid = -1; 356 opt.uio_segflg = UIO_SYSSPACE; 357 opt.uio_rw = UIO_READ; 358 opt.uio_td = td; 359 360 /* Set permissions for top-level jails from sysctls. */ 361 if (!jailed(td->td_ucred)) { 362 for (fi = 0; fi < sizeof(pr_allow_names) / 363 sizeof(pr_allow_names[0]); fi++) { 364 optiov[opt.uio_iovcnt].iov_base = 365 (jail_default_allow & (1 << fi)) 366 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 367 optiov[opt.uio_iovcnt].iov_len = 368 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 369 opt.uio_iovcnt += 2; 370 } 371 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 372 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 373 opt.uio_iovcnt++; 374 enforce_statfs = jail_default_enforce_statfs; 375 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 376 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 377 opt.uio_iovcnt++; 378 } 379 380 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 381 #ifdef INET 382 ip4s = (j->version == 0) ? 1 : j->ip4s; 383 if (ip4s > jail_max_af_ips) 384 return (EINVAL); 385 tmplen += ip4s * sizeof(struct in_addr); 386 #else 387 if (j->ip4s > 0) 388 return (EINVAL); 389 #endif 390 #ifdef INET6 391 if (j->ip6s > jail_max_af_ips) 392 return (EINVAL); 393 tmplen += j->ip6s * sizeof(struct in6_addr); 394 #else 395 if (j->ip6s > 0) 396 return (EINVAL); 397 #endif 398 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 399 u_hostname = u_path + MAXPATHLEN; 400 u_name = u_hostname + MAXHOSTNAMELEN; 401 #ifdef INET 402 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 403 #endif 404 #ifdef INET6 405 #ifdef INET 406 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 407 #else 408 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 409 #endif 410 #endif 411 optiov[opt.uio_iovcnt].iov_base = "path"; 412 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 413 opt.uio_iovcnt++; 414 optiov[opt.uio_iovcnt].iov_base = u_path; 415 error = copyinstr(j->path, u_path, MAXPATHLEN, 416 &optiov[opt.uio_iovcnt].iov_len); 417 if (error) { 418 free(u_path, M_TEMP); 419 return (error); 420 } 421 opt.uio_iovcnt++; 422 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 423 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 424 opt.uio_iovcnt++; 425 optiov[opt.uio_iovcnt].iov_base = u_hostname; 426 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 427 &optiov[opt.uio_iovcnt].iov_len); 428 if (error) { 429 free(u_path, M_TEMP); 430 return (error); 431 } 432 opt.uio_iovcnt++; 433 if (j->jailname != NULL) { 434 optiov[opt.uio_iovcnt].iov_base = "name"; 435 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 436 opt.uio_iovcnt++; 437 optiov[opt.uio_iovcnt].iov_base = u_name; 438 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 439 &optiov[opt.uio_iovcnt].iov_len); 440 if (error) { 441 free(u_path, M_TEMP); 442 return (error); 443 } 444 opt.uio_iovcnt++; 445 } 446 #ifdef INET 447 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 448 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 449 opt.uio_iovcnt++; 450 optiov[opt.uio_iovcnt].iov_base = u_ip4; 451 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 452 if (j->version == 0) 453 u_ip4->s_addr = j->ip4s; 454 else { 455 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 456 if (error) { 457 free(u_path, M_TEMP); 458 return (error); 459 } 460 } 461 opt.uio_iovcnt++; 462 #endif 463 #ifdef INET6 464 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 465 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 466 opt.uio_iovcnt++; 467 optiov[opt.uio_iovcnt].iov_base = u_ip6; 468 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 469 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 470 if (error) { 471 free(u_path, M_TEMP); 472 return (error); 473 } 474 opt.uio_iovcnt++; 475 #endif 476 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]), 477 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 478 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 479 free(u_path, M_TEMP); 480 return (error); 481 } 482 483 484 /* 485 * struct jail_set_args { 486 * struct iovec *iovp; 487 * unsigned int iovcnt; 488 * int flags; 489 * }; 490 */ 491 int 492 sys_jail_set(struct thread *td, struct jail_set_args *uap) 493 { 494 struct uio *auio; 495 int error; 496 497 /* Check that we have an even number of iovecs. */ 498 if (uap->iovcnt & 1) 499 return (EINVAL); 500 501 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 502 if (error) 503 return (error); 504 error = kern_jail_set(td, auio, uap->flags); 505 free(auio, M_IOV); 506 return (error); 507 } 508 509 int 510 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 511 { 512 struct nameidata nd; 513 #ifdef INET 514 struct in_addr *ip4; 515 #endif 516 #ifdef INET6 517 struct in6_addr *ip6; 518 #endif 519 struct vfsopt *opt; 520 struct vfsoptlist *opts; 521 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 522 struct vnode *root; 523 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 524 #if defined(INET) || defined(INET6) 525 struct prison *tppr; 526 void *op; 527 #endif 528 unsigned long hid; 529 size_t namelen, onamelen; 530 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos; 531 int gotchildmax, gotenforce, gothid, gotslevel; 532 int fi, jid, jsys, len, level; 533 int childmax, slevel, vfslocked; 534 int fullpath_disabled; 535 #if defined(INET) || defined(INET6) 536 int ii, ij; 537 #endif 538 #ifdef INET 539 int ip4s, redo_ip4; 540 #endif 541 #ifdef INET6 542 int ip6s, redo_ip6; 543 #endif 544 uint64_t pr_allow, ch_allow, pr_flags, ch_flags; 545 unsigned tallow; 546 char numbuf[12]; 547 548 error = priv_check(td, PRIV_JAIL_SET); 549 if (!error && (flags & JAIL_ATTACH)) 550 error = priv_check(td, PRIV_JAIL_ATTACH); 551 if (error) 552 return (error); 553 mypr = ppr = td->td_ucred->cr_prison; 554 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 555 return (EPERM); 556 if (flags & ~JAIL_SET_MASK) 557 return (EINVAL); 558 559 /* 560 * Check all the parameters before committing to anything. Not all 561 * errors can be caught early, but we may as well try. Also, this 562 * takes care of some expensive stuff (path lookup) before getting 563 * the allprison lock. 564 * 565 * XXX Jails are not filesystems, and jail parameters are not mount 566 * options. But it makes more sense to re-use the vfsopt code 567 * than duplicate it under a different name. 568 */ 569 error = vfs_buildopts(optuio, &opts); 570 if (error) 571 return (error); 572 #ifdef INET 573 ip4 = NULL; 574 #endif 575 #ifdef INET6 576 ip6 = NULL; 577 #endif 578 579 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 580 if (error == ENOENT) 581 jid = 0; 582 else if (error != 0) 583 goto done_free; 584 585 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 586 if (error == ENOENT) 587 gotslevel = 0; 588 else if (error != 0) 589 goto done_free; 590 else 591 gotslevel = 1; 592 593 error = 594 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 595 if (error == ENOENT) 596 gotchildmax = 0; 597 else if (error != 0) 598 goto done_free; 599 else 600 gotchildmax = 1; 601 602 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 603 if (error == ENOENT) 604 gotenforce = 0; 605 else if (error != 0) 606 goto done_free; 607 else if (enforce < 0 || enforce > 2) { 608 error = EINVAL; 609 goto done_free; 610 } else 611 gotenforce = 1; 612 613 pr_flags = ch_flags = 0; 614 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 615 fi++) { 616 if (pr_flag_names[fi] == NULL) 617 continue; 618 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 619 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 620 } 621 ch_flags |= pr_flags; 622 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 623 fi++) { 624 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys, 625 sizeof(jsys)); 626 if (error == ENOENT) 627 continue; 628 if (error != 0) 629 goto done_free; 630 switch (jsys) { 631 case JAIL_SYS_DISABLE: 632 if (!pr_flag_jailsys[fi].disable) { 633 error = EINVAL; 634 goto done_free; 635 } 636 pr_flags |= pr_flag_jailsys[fi].disable; 637 break; 638 case JAIL_SYS_NEW: 639 pr_flags |= pr_flag_jailsys[fi].new; 640 break; 641 case JAIL_SYS_INHERIT: 642 break; 643 default: 644 error = EINVAL; 645 goto done_free; 646 } 647 ch_flags |= 648 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable; 649 } 650 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 651 && !(pr_flags & PR_PERSIST)) { 652 error = EINVAL; 653 vfs_opterror(opts, "new jail must persist or attach"); 654 goto done_errmsg; 655 } 656 #ifdef VIMAGE 657 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 658 error = EINVAL; 659 vfs_opterror(opts, "vnet cannot be changed after creation"); 660 goto done_errmsg; 661 } 662 #endif 663 #ifdef INET 664 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 665 error = EINVAL; 666 vfs_opterror(opts, "ip4 cannot be changed after creation"); 667 goto done_errmsg; 668 } 669 #endif 670 #ifdef INET6 671 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 672 error = EINVAL; 673 vfs_opterror(opts, "ip6 cannot be changed after creation"); 674 goto done_errmsg; 675 } 676 #endif 677 678 pr_allow = ch_allow = 0; 679 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 680 fi++) { 681 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 682 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 683 } 684 ch_allow |= pr_allow; 685 686 error = vfs_getopt(opts, "name", (void **)&name, &len); 687 if (error == ENOENT) 688 name = NULL; 689 else if (error != 0) 690 goto done_free; 691 else { 692 if (len == 0 || name[len - 1] != '\0') { 693 error = EINVAL; 694 goto done_free; 695 } 696 if (len > MAXHOSTNAMELEN) { 697 error = ENAMETOOLONG; 698 goto done_free; 699 } 700 } 701 702 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 703 if (error == ENOENT) 704 host = NULL; 705 else if (error != 0) 706 goto done_free; 707 else { 708 ch_flags |= PR_HOST; 709 pr_flags |= PR_HOST; 710 if (len == 0 || host[len - 1] != '\0') { 711 error = EINVAL; 712 goto done_free; 713 } 714 if (len > MAXHOSTNAMELEN) { 715 error = ENAMETOOLONG; 716 goto done_free; 717 } 718 } 719 720 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 721 if (error == ENOENT) 722 domain = NULL; 723 else if (error != 0) 724 goto done_free; 725 else { 726 ch_flags |= PR_HOST; 727 pr_flags |= PR_HOST; 728 if (len == 0 || domain[len - 1] != '\0') { 729 error = EINVAL; 730 goto done_free; 731 } 732 if (len > MAXHOSTNAMELEN) { 733 error = ENAMETOOLONG; 734 goto done_free; 735 } 736 } 737 738 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 739 if (error == ENOENT) 740 uuid = NULL; 741 else if (error != 0) 742 goto done_free; 743 else { 744 ch_flags |= PR_HOST; 745 pr_flags |= PR_HOST; 746 if (len == 0 || uuid[len - 1] != '\0') { 747 error = EINVAL; 748 goto done_free; 749 } 750 if (len > HOSTUUIDLEN) { 751 error = ENAMETOOLONG; 752 goto done_free; 753 } 754 } 755 756 #ifdef COMPAT_FREEBSD32 757 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 758 uint32_t hid32; 759 760 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 761 hid = hid32; 762 } else 763 #endif 764 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 765 if (error == ENOENT) 766 gothid = 0; 767 else if (error != 0) 768 goto done_free; 769 else { 770 gothid = 1; 771 ch_flags |= PR_HOST; 772 pr_flags |= PR_HOST; 773 } 774 775 #ifdef INET 776 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 777 if (error == ENOENT) 778 ip4s = (pr_flags & PR_IP4_DISABLE) ? 0 : -1; 779 else if (error != 0) 780 goto done_free; 781 else if (ip4s & (sizeof(*ip4) - 1)) { 782 error = EINVAL; 783 goto done_free; 784 } else { 785 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE; 786 if (ip4s == 0) 787 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE; 788 else { 789 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER; 790 ip4s /= sizeof(*ip4); 791 if (ip4s > jail_max_af_ips) { 792 error = EINVAL; 793 vfs_opterror(opts, "too many IPv4 addresses"); 794 goto done_errmsg; 795 } 796 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 797 bcopy(op, ip4, ip4s * sizeof(*ip4)); 798 /* 799 * IP addresses are all sorted but ip[0] to preserve 800 * the primary IP address as given from userland. 801 * This special IP is used for unbound outgoing 802 * connections as well for "loopback" traffic in case 803 * source address selection cannot find any more fitting 804 * address to connect from. 805 */ 806 if (ip4s > 1) 807 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4); 808 /* 809 * Check for duplicate addresses and do some simple 810 * zero and broadcast checks. If users give other bogus 811 * addresses it is their problem. 812 * 813 * We do not have to care about byte order for these 814 * checks so we will do them in NBO. 815 */ 816 for (ii = 0; ii < ip4s; ii++) { 817 if (ip4[ii].s_addr == INADDR_ANY || 818 ip4[ii].s_addr == INADDR_BROADCAST) { 819 error = EINVAL; 820 goto done_free; 821 } 822 if ((ii+1) < ip4s && 823 (ip4[0].s_addr == ip4[ii+1].s_addr || 824 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 825 error = EINVAL; 826 goto done_free; 827 } 828 } 829 } 830 } 831 #endif 832 833 #ifdef INET6 834 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 835 if (error == ENOENT) 836 ip6s = (pr_flags & PR_IP6_DISABLE) ? 0 : -1; 837 else if (error != 0) 838 goto done_free; 839 else if (ip6s & (sizeof(*ip6) - 1)) { 840 error = EINVAL; 841 goto done_free; 842 } else { 843 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE; 844 if (ip6s == 0) 845 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE; 846 else { 847 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER; 848 ip6s /= sizeof(*ip6); 849 if (ip6s > jail_max_af_ips) { 850 error = EINVAL; 851 vfs_opterror(opts, "too many IPv6 addresses"); 852 goto done_errmsg; 853 } 854 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 855 bcopy(op, ip6, ip6s * sizeof(*ip6)); 856 if (ip6s > 1) 857 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6); 858 for (ii = 0; ii < ip6s; ii++) { 859 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 860 error = EINVAL; 861 goto done_free; 862 } 863 if ((ii+1) < ip6s && 864 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 865 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 866 { 867 error = EINVAL; 868 goto done_free; 869 } 870 } 871 } 872 } 873 #endif 874 875 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 876 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 877 error = EINVAL; 878 vfs_opterror(opts, 879 "vnet jails cannot have IP address restrictions"); 880 goto done_errmsg; 881 } 882 #endif 883 884 fullpath_disabled = 0; 885 root = NULL; 886 error = vfs_getopt(opts, "path", (void **)&path, &len); 887 if (error == ENOENT) 888 path = NULL; 889 else if (error != 0) 890 goto done_free; 891 else { 892 if (flags & JAIL_UPDATE) { 893 error = EINVAL; 894 vfs_opterror(opts, 895 "path cannot be changed after creation"); 896 goto done_errmsg; 897 } 898 if (len == 0 || path[len - 1] != '\0') { 899 error = EINVAL; 900 goto done_free; 901 } 902 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE, UIO_SYSSPACE, 903 path, td); 904 error = namei(&nd); 905 if (error) 906 goto done_free; 907 vfslocked = NDHASGIANT(&nd); 908 root = nd.ni_vp; 909 NDFREE(&nd, NDF_ONLY_PNBUF); 910 error = vn_path_to_global_path(td, root, path, MAXPATHLEN); 911 if (error == ENODEV) { 912 /* proceed if sysctl debug.disablefullpath == 1 */ 913 fullpath_disabled = 1; 914 if (len < 2 || (len == 2 && path[0] == '/')) 915 path = NULL; 916 } else if (error != 0) { 917 /* exit on other errors */ 918 VFS_UNLOCK_GIANT(vfslocked); 919 goto done_free; 920 } 921 if (root->v_type != VDIR) { 922 error = ENOTDIR; 923 vput(root); 924 VFS_UNLOCK_GIANT(vfslocked); 925 goto done_free; 926 } 927 VOP_UNLOCK(root, 0); 928 VFS_UNLOCK_GIANT(vfslocked); 929 if (fullpath_disabled) { 930 /* Leave room for a real-root full pathname. */ 931 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 932 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 933 error = ENAMETOOLONG; 934 goto done_free; 935 } 936 } 937 } 938 939 /* 940 * Grab the allprison lock before letting modules check their 941 * parameters. Once we have it, do not let go so we'll have a 942 * consistent view of the OSD list. 943 */ 944 sx_xlock(&allprison_lock); 945 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts); 946 if (error) 947 goto done_unlock_list; 948 949 /* By now, all parameters should have been noted. */ 950 TAILQ_FOREACH(opt, opts, link) { 951 if (!opt->seen && strcmp(opt->name, "errmsg")) { 952 error = EINVAL; 953 vfs_opterror(opts, "unknown parameter: %s", opt->name); 954 goto done_unlock_list; 955 } 956 } 957 958 /* 959 * See if we are creating a new record or updating an existing one. 960 * This abuses the file error codes ENOENT and EEXIST. 961 */ 962 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 963 if (!cuflags) { 964 error = EINVAL; 965 vfs_opterror(opts, "no valid operation (create or update)"); 966 goto done_unlock_list; 967 } 968 pr = NULL; 969 namelc = NULL; 970 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 971 namelc = strrchr(name, '.'); 972 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 973 if (*p != '\0') 974 jid = 0; 975 } 976 if (jid != 0) { 977 /* 978 * See if a requested jid already exists. There is an 979 * information leak here if the jid exists but is not within 980 * the caller's jail hierarchy. Jail creators will get EEXIST 981 * even though they cannot see the jail, and CREATE | UPDATE 982 * will return ENOENT which is not normally a valid error. 983 */ 984 if (jid < 0) { 985 error = EINVAL; 986 vfs_opterror(opts, "negative jid"); 987 goto done_unlock_list; 988 } 989 pr = prison_find(jid); 990 if (pr != NULL) { 991 ppr = pr->pr_parent; 992 /* Create: jid must not exist. */ 993 if (cuflags == JAIL_CREATE) { 994 mtx_unlock(&pr->pr_mtx); 995 error = EEXIST; 996 vfs_opterror(opts, "jail %d already exists", 997 jid); 998 goto done_unlock_list; 999 } 1000 if (!prison_ischild(mypr, pr)) { 1001 mtx_unlock(&pr->pr_mtx); 1002 pr = NULL; 1003 } else if (pr->pr_uref == 0) { 1004 if (!(flags & JAIL_DYING)) { 1005 mtx_unlock(&pr->pr_mtx); 1006 error = ENOENT; 1007 vfs_opterror(opts, "jail %d is dying", 1008 jid); 1009 goto done_unlock_list; 1010 } else if ((flags & JAIL_ATTACH) || 1011 (pr_flags & PR_PERSIST)) { 1012 /* 1013 * A dying jail might be resurrected 1014 * (via attach or persist), but first 1015 * it must determine if another jail 1016 * has claimed its name. Accomplish 1017 * this by implicitly re-setting the 1018 * name. 1019 */ 1020 if (name == NULL) 1021 name = prison_name(mypr, pr); 1022 } 1023 } 1024 } 1025 if (pr == NULL) { 1026 /* Update: jid must exist. */ 1027 if (cuflags == JAIL_UPDATE) { 1028 error = ENOENT; 1029 vfs_opterror(opts, "jail %d not found", jid); 1030 goto done_unlock_list; 1031 } 1032 } 1033 } 1034 /* 1035 * If the caller provided a name, look for a jail by that name. 1036 * This has different semantics for creates and updates keyed by jid 1037 * (where the name must not already exist in a different jail), 1038 * and updates keyed by the name itself (where the name must exist 1039 * because that is the jail being updated). 1040 */ 1041 if (name != NULL) { 1042 namelc = strrchr(name, '.'); 1043 if (namelc == NULL) 1044 namelc = name; 1045 else { 1046 /* 1047 * This is a hierarchical name. Split it into the 1048 * parent and child names, and make sure the parent 1049 * exists or matches an already found jail. 1050 */ 1051 *namelc = '\0'; 1052 if (pr != NULL) { 1053 if (strncmp(name, ppr->pr_name, namelc - name) 1054 || ppr->pr_name[namelc - name] != '\0') { 1055 mtx_unlock(&pr->pr_mtx); 1056 error = EINVAL; 1057 vfs_opterror(opts, 1058 "cannot change jail's parent"); 1059 goto done_unlock_list; 1060 } 1061 } else { 1062 ppr = prison_find_name(mypr, name); 1063 if (ppr == NULL) { 1064 error = ENOENT; 1065 vfs_opterror(opts, 1066 "jail \"%s\" not found", name); 1067 goto done_unlock_list; 1068 } 1069 mtx_unlock(&ppr->pr_mtx); 1070 } 1071 name = ++namelc; 1072 } 1073 if (name[0] != '\0') { 1074 namelen = 1075 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1076 name_again: 1077 deadpr = NULL; 1078 FOREACH_PRISON_CHILD(ppr, tpr) { 1079 if (tpr != pr && tpr->pr_ref > 0 && 1080 !strcmp(tpr->pr_name + namelen, name)) { 1081 if (pr == NULL && 1082 cuflags != JAIL_CREATE) { 1083 mtx_lock(&tpr->pr_mtx); 1084 if (tpr->pr_ref > 0) { 1085 /* 1086 * Use this jail 1087 * for updates. 1088 */ 1089 if (tpr->pr_uref > 0) { 1090 pr = tpr; 1091 break; 1092 } 1093 deadpr = tpr; 1094 } 1095 mtx_unlock(&tpr->pr_mtx); 1096 } else if (tpr->pr_uref > 0) { 1097 /* 1098 * Create, or update(jid): 1099 * name must not exist in an 1100 * active sibling jail. 1101 */ 1102 error = EEXIST; 1103 if (pr != NULL) 1104 mtx_unlock(&pr->pr_mtx); 1105 vfs_opterror(opts, 1106 "jail \"%s\" already exists", 1107 name); 1108 goto done_unlock_list; 1109 } 1110 } 1111 } 1112 /* If no active jail is found, use a dying one. */ 1113 if (deadpr != NULL && pr == NULL) { 1114 if (flags & JAIL_DYING) { 1115 mtx_lock(&deadpr->pr_mtx); 1116 if (deadpr->pr_ref == 0) { 1117 mtx_unlock(&deadpr->pr_mtx); 1118 goto name_again; 1119 } 1120 pr = deadpr; 1121 } else if (cuflags == JAIL_UPDATE) { 1122 error = ENOENT; 1123 vfs_opterror(opts, 1124 "jail \"%s\" is dying", name); 1125 goto done_unlock_list; 1126 } 1127 } 1128 /* Update: name must exist if no jid. */ 1129 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1130 error = ENOENT; 1131 vfs_opterror(opts, "jail \"%s\" not found", 1132 name); 1133 goto done_unlock_list; 1134 } 1135 } 1136 } 1137 /* Update: must provide a jid or name. */ 1138 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1139 error = ENOENT; 1140 vfs_opterror(opts, "update specified no jail"); 1141 goto done_unlock_list; 1142 } 1143 1144 /* If there's no prison to update, create a new one and link it in. */ 1145 if (pr == NULL) { 1146 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1147 if (tpr->pr_childcount >= tpr->pr_childmax) { 1148 error = EPERM; 1149 vfs_opterror(opts, "prison limit exceeded"); 1150 goto done_unlock_list; 1151 } 1152 created = 1; 1153 mtx_lock(&ppr->pr_mtx); 1154 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) { 1155 mtx_unlock(&ppr->pr_mtx); 1156 error = ENOENT; 1157 vfs_opterror(opts, "parent jail went away!"); 1158 goto done_unlock_list; 1159 } 1160 ppr->pr_ref++; 1161 ppr->pr_uref++; 1162 mtx_unlock(&ppr->pr_mtx); 1163 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1164 if (jid == 0) { 1165 /* Find the next free jid. */ 1166 jid = lastprid + 1; 1167 findnext: 1168 if (jid == JAIL_MAX) 1169 jid = 1; 1170 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1171 if (tpr->pr_id < jid) 1172 continue; 1173 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1174 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1175 break; 1176 } 1177 if (jid == lastprid) { 1178 error = EAGAIN; 1179 vfs_opterror(opts, 1180 "no available jail IDs"); 1181 free(pr, M_PRISON); 1182 prison_deref(ppr, PD_DEREF | 1183 PD_DEUREF | PD_LIST_XLOCKED); 1184 goto done_releroot; 1185 } 1186 jid++; 1187 goto findnext; 1188 } 1189 lastprid = jid; 1190 } else { 1191 /* 1192 * The jail already has a jid (that did not yet exist), 1193 * so just find where to insert it. 1194 */ 1195 TAILQ_FOREACH(tpr, &allprison, pr_list) 1196 if (tpr->pr_id >= jid) { 1197 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1198 break; 1199 } 1200 } 1201 if (tpr == NULL) 1202 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1203 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1204 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1205 tpr->pr_childcount++; 1206 1207 pr->pr_parent = ppr; 1208 pr->pr_id = jid; 1209 1210 /* Set some default values, and inherit some from the parent. */ 1211 if (name == NULL) 1212 name = ""; 1213 if (path == NULL) { 1214 path = "/"; 1215 root = mypr->pr_root; 1216 vref(root); 1217 } 1218 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1219 pr->pr_flags |= PR_HOST; 1220 #if defined(INET) || defined(INET6) 1221 #ifdef VIMAGE 1222 if (!(pr_flags & PR_VNET)) 1223 #endif 1224 { 1225 #ifdef INET 1226 if (!(ch_flags & PR_IP4_USER)) 1227 pr->pr_flags |= 1228 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE; 1229 else if (!(pr_flags & PR_IP4_USER)) { 1230 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1231 if (ppr->pr_ip4 != NULL) { 1232 pr->pr_ip4s = ppr->pr_ip4s; 1233 pr->pr_ip4 = malloc(pr->pr_ip4s * 1234 sizeof(struct in_addr), M_PRISON, 1235 M_WAITOK); 1236 bcopy(ppr->pr_ip4, pr->pr_ip4, 1237 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1238 } 1239 } 1240 #endif 1241 #ifdef INET6 1242 if (!(ch_flags & PR_IP6_USER)) 1243 pr->pr_flags |= 1244 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE; 1245 else if (!(pr_flags & PR_IP6_USER)) { 1246 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1247 if (ppr->pr_ip6 != NULL) { 1248 pr->pr_ip6s = ppr->pr_ip6s; 1249 pr->pr_ip6 = malloc(pr->pr_ip6s * 1250 sizeof(struct in6_addr), M_PRISON, 1251 M_WAITOK); 1252 bcopy(ppr->pr_ip6, pr->pr_ip6, 1253 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1254 } 1255 } 1256 #endif 1257 } 1258 #endif 1259 /* Source address selection is always on by default. */ 1260 pr->pr_flags |= _PR_IP_SADDRSEL; 1261 1262 pr->pr_securelevel = ppr->pr_securelevel; 1263 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1264 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 1265 1266 LIST_INIT(&pr->pr_children); 1267 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1268 1269 #ifdef VIMAGE 1270 /* Allocate a new vnet if specified. */ 1271 pr->pr_vnet = (pr_flags & PR_VNET) 1272 ? vnet_alloc() : ppr->pr_vnet; 1273 #endif 1274 /* 1275 * Allocate a dedicated cpuset for each jail. 1276 * Unlike other initial settings, this may return an erorr. 1277 */ 1278 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1279 if (error) { 1280 prison_deref(pr, PD_LIST_XLOCKED); 1281 goto done_releroot; 1282 } 1283 1284 mtx_lock(&pr->pr_mtx); 1285 /* 1286 * New prisons do not yet have a reference, because we do not 1287 * want other to see the incomplete prison once the 1288 * allprison_lock is downgraded. 1289 */ 1290 } else { 1291 created = 0; 1292 /* 1293 * Grab a reference for existing prisons, to ensure they 1294 * continue to exist for the duration of the call. 1295 */ 1296 pr->pr_ref++; 1297 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1298 if ((pr->pr_flags & PR_VNET) && 1299 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1300 error = EINVAL; 1301 vfs_opterror(opts, 1302 "vnet jails cannot have IP address restrictions"); 1303 goto done_deref_locked; 1304 } 1305 #endif 1306 #ifdef INET 1307 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1308 error = EINVAL; 1309 vfs_opterror(opts, 1310 "ip4 cannot be changed after creation"); 1311 goto done_deref_locked; 1312 } 1313 #endif 1314 #ifdef INET6 1315 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1316 error = EINVAL; 1317 vfs_opterror(opts, 1318 "ip6 cannot be changed after creation"); 1319 goto done_deref_locked; 1320 } 1321 #endif 1322 } 1323 1324 /* Do final error checking before setting anything. */ 1325 if (gotslevel) { 1326 if (slevel < ppr->pr_securelevel) { 1327 error = EPERM; 1328 goto done_deref_locked; 1329 } 1330 } 1331 if (gotchildmax) { 1332 if (childmax >= ppr->pr_childmax) { 1333 error = EPERM; 1334 goto done_deref_locked; 1335 } 1336 } 1337 if (gotenforce) { 1338 if (enforce < ppr->pr_enforce_statfs) { 1339 error = EPERM; 1340 goto done_deref_locked; 1341 } 1342 } 1343 #ifdef INET 1344 if (ip4s > 0) { 1345 if (ppr->pr_flags & PR_IP4) { 1346 /* 1347 * Make sure the new set of IP addresses is a 1348 * subset of the parent's list. Don't worry 1349 * about the parent being unlocked, as any 1350 * setting is done with allprison_lock held. 1351 */ 1352 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1353 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1354 break; 1355 if (ij == ppr->pr_ip4s) { 1356 error = EPERM; 1357 goto done_deref_locked; 1358 } 1359 if (ip4s > 1) { 1360 for (ii = ij = 1; ii < ip4s; ii++) { 1361 if (ip4[ii].s_addr == 1362 ppr->pr_ip4[0].s_addr) 1363 continue; 1364 for (; ij < ppr->pr_ip4s; ij++) 1365 if (ip4[ii].s_addr == 1366 ppr->pr_ip4[ij].s_addr) 1367 break; 1368 if (ij == ppr->pr_ip4s) 1369 break; 1370 } 1371 if (ij == ppr->pr_ip4s) { 1372 error = EPERM; 1373 goto done_deref_locked; 1374 } 1375 } 1376 } 1377 /* 1378 * Check for conflicting IP addresses. We permit them 1379 * if there is no more than one IP on each jail. If 1380 * there is a duplicate on a jail with more than one 1381 * IP stop checking and return error. 1382 */ 1383 tppr = ppr; 1384 #ifdef VIMAGE 1385 for (; tppr != &prison0; tppr = tppr->pr_parent) 1386 if (tppr->pr_flags & PR_VNET) 1387 break; 1388 #endif 1389 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1390 if (tpr == pr || 1391 #ifdef VIMAGE 1392 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1393 #endif 1394 tpr->pr_uref == 0) { 1395 descend = 0; 1396 continue; 1397 } 1398 if (!(tpr->pr_flags & PR_IP4_USER)) 1399 continue; 1400 descend = 0; 1401 if (tpr->pr_ip4 == NULL || 1402 (ip4s == 1 && tpr->pr_ip4s == 1)) 1403 continue; 1404 for (ii = 0; ii < ip4s; ii++) { 1405 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1406 error = EADDRINUSE; 1407 vfs_opterror(opts, 1408 "IPv4 addresses clash"); 1409 goto done_deref_locked; 1410 } 1411 } 1412 } 1413 } 1414 #endif 1415 #ifdef INET6 1416 if (ip6s > 0) { 1417 if (ppr->pr_flags & PR_IP6) { 1418 /* 1419 * Make sure the new set of IP addresses is a 1420 * subset of the parent's list. 1421 */ 1422 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1423 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1424 &ppr->pr_ip6[ij])) 1425 break; 1426 if (ij == ppr->pr_ip6s) { 1427 error = EPERM; 1428 goto done_deref_locked; 1429 } 1430 if (ip6s > 1) { 1431 for (ii = ij = 1; ii < ip6s; ii++) { 1432 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1433 &ppr->pr_ip6[0])) 1434 continue; 1435 for (; ij < ppr->pr_ip6s; ij++) 1436 if (IN6_ARE_ADDR_EQUAL( 1437 &ip6[ii], &ppr->pr_ip6[ij])) 1438 break; 1439 if (ij == ppr->pr_ip6s) 1440 break; 1441 } 1442 if (ij == ppr->pr_ip6s) { 1443 error = EPERM; 1444 goto done_deref_locked; 1445 } 1446 } 1447 } 1448 /* Check for conflicting IP addresses. */ 1449 tppr = ppr; 1450 #ifdef VIMAGE 1451 for (; tppr != &prison0; tppr = tppr->pr_parent) 1452 if (tppr->pr_flags & PR_VNET) 1453 break; 1454 #endif 1455 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1456 if (tpr == pr || 1457 #ifdef VIMAGE 1458 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1459 #endif 1460 tpr->pr_uref == 0) { 1461 descend = 0; 1462 continue; 1463 } 1464 if (!(tpr->pr_flags & PR_IP6_USER)) 1465 continue; 1466 descend = 0; 1467 if (tpr->pr_ip6 == NULL || 1468 (ip6s == 1 && tpr->pr_ip6s == 1)) 1469 continue; 1470 for (ii = 0; ii < ip6s; ii++) { 1471 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1472 error = EADDRINUSE; 1473 vfs_opterror(opts, 1474 "IPv6 addresses clash"); 1475 goto done_deref_locked; 1476 } 1477 } 1478 } 1479 } 1480 #endif 1481 onamelen = namelen = 0; 1482 if (name != NULL) { 1483 /* Give a default name of the jid. */ 1484 if (name[0] == '\0') 1485 snprintf(name = numbuf, sizeof(numbuf), "%d", jid); 1486 else if (*namelc == '0' || (strtoul(namelc, &p, 10) != jid && 1487 *p == '\0')) { 1488 error = EINVAL; 1489 vfs_opterror(opts, 1490 "name cannot be numeric (unless it is the jid)"); 1491 goto done_deref_locked; 1492 } 1493 /* 1494 * Make sure the name isn't too long for the prison or its 1495 * children. 1496 */ 1497 onamelen = strlen(pr->pr_name); 1498 namelen = strlen(name); 1499 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) { 1500 error = ENAMETOOLONG; 1501 goto done_deref_locked; 1502 } 1503 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1504 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1505 sizeof(pr->pr_name)) { 1506 error = ENAMETOOLONG; 1507 goto done_deref_locked; 1508 } 1509 } 1510 } 1511 if (pr_allow & ~ppr->pr_allow) { 1512 error = EPERM; 1513 goto done_deref_locked; 1514 } 1515 1516 /* Set the parameters of the prison. */ 1517 #ifdef INET 1518 redo_ip4 = 0; 1519 if (pr_flags & PR_IP4_USER) { 1520 pr->pr_flags |= PR_IP4; 1521 free(pr->pr_ip4, M_PRISON); 1522 pr->pr_ip4s = ip4s; 1523 pr->pr_ip4 = ip4; 1524 ip4 = NULL; 1525 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1526 #ifdef VIMAGE 1527 if (tpr->pr_flags & PR_VNET) { 1528 descend = 0; 1529 continue; 1530 } 1531 #endif 1532 if (prison_restrict_ip4(tpr, NULL)) { 1533 redo_ip4 = 1; 1534 descend = 0; 1535 } 1536 } 1537 } 1538 #endif 1539 #ifdef INET6 1540 redo_ip6 = 0; 1541 if (pr_flags & PR_IP6_USER) { 1542 pr->pr_flags |= PR_IP6; 1543 free(pr->pr_ip6, M_PRISON); 1544 pr->pr_ip6s = ip6s; 1545 pr->pr_ip6 = ip6; 1546 ip6 = NULL; 1547 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1548 #ifdef VIMAGE 1549 if (tpr->pr_flags & PR_VNET) { 1550 descend = 0; 1551 continue; 1552 } 1553 #endif 1554 if (prison_restrict_ip6(tpr, NULL)) { 1555 redo_ip6 = 1; 1556 descend = 0; 1557 } 1558 } 1559 } 1560 #endif 1561 if (gotslevel) { 1562 pr->pr_securelevel = slevel; 1563 /* Set all child jails to be at least this level. */ 1564 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1565 if (tpr->pr_securelevel < slevel) 1566 tpr->pr_securelevel = slevel; 1567 } 1568 if (gotchildmax) { 1569 pr->pr_childmax = childmax; 1570 /* Set all child jails to under this limit. */ 1571 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1572 if (tpr->pr_childmax > childmax - level) 1573 tpr->pr_childmax = childmax > level 1574 ? childmax - level : 0; 1575 } 1576 if (gotenforce) { 1577 pr->pr_enforce_statfs = enforce; 1578 /* Pass this restriction on to the children. */ 1579 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1580 if (tpr->pr_enforce_statfs < enforce) 1581 tpr->pr_enforce_statfs = enforce; 1582 } 1583 if (name != NULL) { 1584 if (ppr == &prison0) 1585 strlcpy(pr->pr_name, name, sizeof(pr->pr_name)); 1586 else 1587 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1588 ppr->pr_name, name); 1589 /* Change this component of child names. */ 1590 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1591 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1592 strlen(tpr->pr_name + onamelen) + 1); 1593 bcopy(pr->pr_name, tpr->pr_name, namelen); 1594 } 1595 } 1596 if (path != NULL) { 1597 /* Try to keep a real-rooted full pathname. */ 1598 if (fullpath_disabled && path[0] == '/' && 1599 strcmp(mypr->pr_path, "/")) 1600 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1601 mypr->pr_path, path); 1602 else 1603 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1604 pr->pr_root = root; 1605 } 1606 if (PR_HOST & ch_flags & ~pr_flags) { 1607 if (pr->pr_flags & PR_HOST) { 1608 /* 1609 * Copy the parent's host info. As with pr_ip4 above, 1610 * the lack of a lock on the parent is not a problem; 1611 * it is always set with allprison_lock at least 1612 * shared, and is held exclusively here. 1613 */ 1614 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1615 sizeof(pr->pr_hostname)); 1616 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1617 sizeof(pr->pr_domainname)); 1618 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1619 sizeof(pr->pr_hostuuid)); 1620 pr->pr_hostid = pr->pr_parent->pr_hostid; 1621 } 1622 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1623 /* Set this prison, and any descendants without PR_HOST. */ 1624 if (host != NULL) 1625 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1626 if (domain != NULL) 1627 strlcpy(pr->pr_domainname, domain, 1628 sizeof(pr->pr_domainname)); 1629 if (uuid != NULL) 1630 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1631 if (gothid) 1632 pr->pr_hostid = hid; 1633 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1634 if (tpr->pr_flags & PR_HOST) 1635 descend = 0; 1636 else { 1637 if (host != NULL) 1638 strlcpy(tpr->pr_hostname, 1639 pr->pr_hostname, 1640 sizeof(tpr->pr_hostname)); 1641 if (domain != NULL) 1642 strlcpy(tpr->pr_domainname, 1643 pr->pr_domainname, 1644 sizeof(tpr->pr_domainname)); 1645 if (uuid != NULL) 1646 strlcpy(tpr->pr_hostuuid, 1647 pr->pr_hostuuid, 1648 sizeof(tpr->pr_hostuuid)); 1649 if (gothid) 1650 tpr->pr_hostid = hid; 1651 } 1652 } 1653 } 1654 if ((tallow = ch_allow & ~pr_allow)) { 1655 /* Clear allow bits in all children. */ 1656 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1657 tpr->pr_allow &= ~tallow; 1658 } 1659 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1660 /* 1661 * Persistent prisons get an extra reference, and prisons losing their 1662 * persist flag lose that reference. Only do this for existing prisons 1663 * for now, so new ones will remain unseen until after the module 1664 * handlers have completed. 1665 */ 1666 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1667 if (pr_flags & PR_PERSIST) { 1668 pr->pr_ref++; 1669 pr->pr_uref++; 1670 } else { 1671 pr->pr_ref--; 1672 pr->pr_uref--; 1673 } 1674 } 1675 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1676 mtx_unlock(&pr->pr_mtx); 1677 1678 #ifdef RACCT 1679 if (created) 1680 prison_racct_attach(pr); 1681 #endif 1682 1683 /* Locks may have prevented a complete restriction of child IP 1684 * addresses. If so, allocate some more memory and try again. 1685 */ 1686 #ifdef INET 1687 while (redo_ip4) { 1688 ip4s = pr->pr_ip4s; 1689 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1690 mtx_lock(&pr->pr_mtx); 1691 redo_ip4 = 0; 1692 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1693 #ifdef VIMAGE 1694 if (tpr->pr_flags & PR_VNET) { 1695 descend = 0; 1696 continue; 1697 } 1698 #endif 1699 if (prison_restrict_ip4(tpr, ip4)) { 1700 if (ip4 != NULL) 1701 ip4 = NULL; 1702 else 1703 redo_ip4 = 1; 1704 } 1705 } 1706 mtx_unlock(&pr->pr_mtx); 1707 } 1708 #endif 1709 #ifdef INET6 1710 while (redo_ip6) { 1711 ip6s = pr->pr_ip6s; 1712 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1713 mtx_lock(&pr->pr_mtx); 1714 redo_ip6 = 0; 1715 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1716 #ifdef VIMAGE 1717 if (tpr->pr_flags & PR_VNET) { 1718 descend = 0; 1719 continue; 1720 } 1721 #endif 1722 if (prison_restrict_ip6(tpr, ip6)) { 1723 if (ip6 != NULL) 1724 ip6 = NULL; 1725 else 1726 redo_ip6 = 1; 1727 } 1728 } 1729 mtx_unlock(&pr->pr_mtx); 1730 } 1731 #endif 1732 1733 /* Let the modules do their work. */ 1734 sx_downgrade(&allprison_lock); 1735 if (created) { 1736 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1737 if (error) { 1738 prison_deref(pr, PD_LIST_SLOCKED); 1739 goto done_errmsg; 1740 } 1741 } 1742 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1743 if (error) { 1744 prison_deref(pr, created 1745 ? PD_LIST_SLOCKED 1746 : PD_DEREF | PD_LIST_SLOCKED); 1747 goto done_errmsg; 1748 } 1749 1750 /* Attach this process to the prison if requested. */ 1751 if (flags & JAIL_ATTACH) { 1752 mtx_lock(&pr->pr_mtx); 1753 error = do_jail_attach(td, pr); 1754 if (error) { 1755 vfs_opterror(opts, "attach failed"); 1756 if (!created) 1757 prison_deref(pr, PD_DEREF); 1758 goto done_errmsg; 1759 } 1760 } 1761 1762 /* 1763 * Now that it is all there, drop the temporary reference from existing 1764 * prisons. Or add a reference to newly created persistent prisons 1765 * (which was not done earlier so that the prison would not be publicly 1766 * visible). 1767 */ 1768 if (!created) { 1769 prison_deref(pr, (flags & JAIL_ATTACH) 1770 ? PD_DEREF 1771 : PD_DEREF | PD_LIST_SLOCKED); 1772 } else { 1773 if (pr_flags & PR_PERSIST) { 1774 mtx_lock(&pr->pr_mtx); 1775 pr->pr_ref++; 1776 pr->pr_uref++; 1777 mtx_unlock(&pr->pr_mtx); 1778 } 1779 if (!(flags & JAIL_ATTACH)) 1780 sx_sunlock(&allprison_lock); 1781 } 1782 td->td_retval[0] = pr->pr_id; 1783 goto done_errmsg; 1784 1785 done_deref_locked: 1786 prison_deref(pr, created 1787 ? PD_LOCKED | PD_LIST_XLOCKED 1788 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1789 goto done_releroot; 1790 done_unlock_list: 1791 sx_xunlock(&allprison_lock); 1792 done_releroot: 1793 if (root != NULL) { 1794 vfslocked = VFS_LOCK_GIANT(root->v_mount); 1795 vrele(root); 1796 VFS_UNLOCK_GIANT(vfslocked); 1797 } 1798 done_errmsg: 1799 if (error) { 1800 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 1801 if (errmsg_len > 0) { 1802 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1803 if (errmsg_pos > 0) { 1804 if (optuio->uio_segflg == UIO_SYSSPACE) 1805 bcopy(errmsg, 1806 optuio->uio_iov[errmsg_pos].iov_base, 1807 errmsg_len); 1808 else 1809 copyout(errmsg, 1810 optuio->uio_iov[errmsg_pos].iov_base, 1811 errmsg_len); 1812 } 1813 } 1814 } 1815 done_free: 1816 #ifdef INET 1817 free(ip4, M_PRISON); 1818 #endif 1819 #ifdef INET6 1820 free(ip6, M_PRISON); 1821 #endif 1822 vfs_freeopts(opts); 1823 return (error); 1824 } 1825 1826 1827 /* 1828 * struct jail_get_args { 1829 * struct iovec *iovp; 1830 * unsigned int iovcnt; 1831 * int flags; 1832 * }; 1833 */ 1834 int 1835 sys_jail_get(struct thread *td, struct jail_get_args *uap) 1836 { 1837 struct uio *auio; 1838 int error; 1839 1840 /* Check that we have an even number of iovecs. */ 1841 if (uap->iovcnt & 1) 1842 return (EINVAL); 1843 1844 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1845 if (error) 1846 return (error); 1847 error = kern_jail_get(td, auio, uap->flags); 1848 if (error == 0) 1849 error = copyout(auio->uio_iov, uap->iovp, 1850 uap->iovcnt * sizeof (struct iovec)); 1851 free(auio, M_IOV); 1852 return (error); 1853 } 1854 1855 int 1856 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1857 { 1858 struct prison *pr, *mypr; 1859 struct vfsopt *opt; 1860 struct vfsoptlist *opts; 1861 char *errmsg, *name; 1862 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1863 1864 if (flags & ~JAIL_GET_MASK) 1865 return (EINVAL); 1866 1867 /* Get the parameter list. */ 1868 error = vfs_buildopts(optuio, &opts); 1869 if (error) 1870 return (error); 1871 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1872 mypr = td->td_ucred->cr_prison; 1873 1874 /* 1875 * Find the prison specified by one of: lastjid, jid, name. 1876 */ 1877 sx_slock(&allprison_lock); 1878 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1879 if (error == 0) { 1880 TAILQ_FOREACH(pr, &allprison, pr_list) { 1881 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1882 mtx_lock(&pr->pr_mtx); 1883 if (pr->pr_ref > 0 && 1884 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1885 break; 1886 mtx_unlock(&pr->pr_mtx); 1887 } 1888 } 1889 if (pr != NULL) 1890 goto found_prison; 1891 error = ENOENT; 1892 vfs_opterror(opts, "no jail after %d", jid); 1893 goto done_unlock_list; 1894 } else if (error != ENOENT) 1895 goto done_unlock_list; 1896 1897 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1898 if (error == 0) { 1899 if (jid != 0) { 1900 pr = prison_find_child(mypr, jid); 1901 if (pr != NULL) { 1902 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1903 mtx_unlock(&pr->pr_mtx); 1904 error = ENOENT; 1905 vfs_opterror(opts, "jail %d is dying", 1906 jid); 1907 goto done_unlock_list; 1908 } 1909 goto found_prison; 1910 } 1911 error = ENOENT; 1912 vfs_opterror(opts, "jail %d not found", jid); 1913 goto done_unlock_list; 1914 } 1915 } else if (error != ENOENT) 1916 goto done_unlock_list; 1917 1918 error = vfs_getopt(opts, "name", (void **)&name, &len); 1919 if (error == 0) { 1920 if (len == 0 || name[len - 1] != '\0') { 1921 error = EINVAL; 1922 goto done_unlock_list; 1923 } 1924 pr = prison_find_name(mypr, name); 1925 if (pr != NULL) { 1926 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1927 mtx_unlock(&pr->pr_mtx); 1928 error = ENOENT; 1929 vfs_opterror(opts, "jail \"%s\" is dying", 1930 name); 1931 goto done_unlock_list; 1932 } 1933 goto found_prison; 1934 } 1935 error = ENOENT; 1936 vfs_opterror(opts, "jail \"%s\" not found", name); 1937 goto done_unlock_list; 1938 } else if (error != ENOENT) 1939 goto done_unlock_list; 1940 1941 vfs_opterror(opts, "no jail specified"); 1942 error = ENOENT; 1943 goto done_unlock_list; 1944 1945 found_prison: 1946 /* Get the parameters of the prison. */ 1947 pr->pr_ref++; 1948 locked = PD_LOCKED; 1949 td->td_retval[0] = pr->pr_id; 1950 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 1951 if (error != 0 && error != ENOENT) 1952 goto done_deref; 1953 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 1954 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 1955 if (error != 0 && error != ENOENT) 1956 goto done_deref; 1957 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 1958 if (error != 0 && error != ENOENT) 1959 goto done_deref; 1960 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 1961 sizeof(pr->pr_cpuset->cs_id)); 1962 if (error != 0 && error != ENOENT) 1963 goto done_deref; 1964 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 1965 if (error != 0 && error != ENOENT) 1966 goto done_deref; 1967 #ifdef INET 1968 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 1969 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1970 if (error != 0 && error != ENOENT) 1971 goto done_deref; 1972 #endif 1973 #ifdef INET6 1974 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 1975 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1976 if (error != 0 && error != ENOENT) 1977 goto done_deref; 1978 #endif 1979 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 1980 sizeof(pr->pr_securelevel)); 1981 if (error != 0 && error != ENOENT) 1982 goto done_deref; 1983 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 1984 sizeof(pr->pr_childcount)); 1985 if (error != 0 && error != ENOENT) 1986 goto done_deref; 1987 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 1988 sizeof(pr->pr_childmax)); 1989 if (error != 0 && error != ENOENT) 1990 goto done_deref; 1991 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 1992 if (error != 0 && error != ENOENT) 1993 goto done_deref; 1994 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 1995 if (error != 0 && error != ENOENT) 1996 goto done_deref; 1997 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 1998 if (error != 0 && error != ENOENT) 1999 goto done_deref; 2000 #ifdef COMPAT_FREEBSD32 2001 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 2002 uint32_t hid32 = pr->pr_hostid; 2003 2004 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 2005 } else 2006 #endif 2007 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 2008 sizeof(pr->pr_hostid)); 2009 if (error != 0 && error != ENOENT) 2010 goto done_deref; 2011 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 2012 sizeof(pr->pr_enforce_statfs)); 2013 if (error != 0 && error != ENOENT) 2014 goto done_deref; 2015 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 2016 fi++) { 2017 if (pr_flag_names[fi] == NULL) 2018 continue; 2019 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 2020 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 2021 if (error != 0 && error != ENOENT) 2022 goto done_deref; 2023 i = !i; 2024 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 2025 if (error != 0 && error != ENOENT) 2026 goto done_deref; 2027 } 2028 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 2029 fi++) { 2030 i = pr->pr_flags & 2031 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2032 i = pr_flag_jailsys[fi].disable && 2033 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2034 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2035 : JAIL_SYS_INHERIT; 2036 error = 2037 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2038 if (error != 0 && error != ENOENT) 2039 goto done_deref; 2040 } 2041 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 2042 fi++) { 2043 if (pr_allow_names[fi] == NULL) 2044 continue; 2045 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2046 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2047 if (error != 0 && error != ENOENT) 2048 goto done_deref; 2049 i = !i; 2050 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2051 if (error != 0 && error != ENOENT) 2052 goto done_deref; 2053 } 2054 i = (pr->pr_uref == 0); 2055 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2056 if (error != 0 && error != ENOENT) 2057 goto done_deref; 2058 i = !i; 2059 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2060 if (error != 0 && error != ENOENT) 2061 goto done_deref; 2062 2063 /* Get the module parameters. */ 2064 mtx_unlock(&pr->pr_mtx); 2065 locked = 0; 2066 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2067 if (error) 2068 goto done_deref; 2069 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2070 2071 /* By now, all parameters should have been noted. */ 2072 TAILQ_FOREACH(opt, opts, link) { 2073 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2074 error = EINVAL; 2075 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2076 goto done_errmsg; 2077 } 2078 } 2079 2080 /* Write the fetched parameters back to userspace. */ 2081 error = 0; 2082 TAILQ_FOREACH(opt, opts, link) { 2083 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2084 pos = 2 * opt->pos + 1; 2085 optuio->uio_iov[pos].iov_len = opt->len; 2086 if (opt->value != NULL) { 2087 if (optuio->uio_segflg == UIO_SYSSPACE) { 2088 bcopy(opt->value, 2089 optuio->uio_iov[pos].iov_base, 2090 opt->len); 2091 } else { 2092 error = copyout(opt->value, 2093 optuio->uio_iov[pos].iov_base, 2094 opt->len); 2095 if (error) 2096 break; 2097 } 2098 } 2099 } 2100 } 2101 goto done_errmsg; 2102 2103 done_deref: 2104 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2105 goto done_errmsg; 2106 2107 done_unlock_list: 2108 sx_sunlock(&allprison_lock); 2109 done_errmsg: 2110 if (error && errmsg_pos >= 0) { 2111 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2112 errmsg_pos = 2 * errmsg_pos + 1; 2113 if (errmsg_len > 0) { 2114 if (optuio->uio_segflg == UIO_SYSSPACE) 2115 bcopy(errmsg, 2116 optuio->uio_iov[errmsg_pos].iov_base, 2117 errmsg_len); 2118 else 2119 copyout(errmsg, 2120 optuio->uio_iov[errmsg_pos].iov_base, 2121 errmsg_len); 2122 } 2123 } 2124 vfs_freeopts(opts); 2125 return (error); 2126 } 2127 2128 2129 /* 2130 * struct jail_remove_args { 2131 * int jid; 2132 * }; 2133 */ 2134 int 2135 sys_jail_remove(struct thread *td, struct jail_remove_args *uap) 2136 { 2137 struct prison *pr, *cpr, *lpr, *tpr; 2138 int descend, error; 2139 2140 error = priv_check(td, PRIV_JAIL_REMOVE); 2141 if (error) 2142 return (error); 2143 2144 sx_xlock(&allprison_lock); 2145 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2146 if (pr == NULL) { 2147 sx_xunlock(&allprison_lock); 2148 return (EINVAL); 2149 } 2150 2151 /* Remove all descendants of this prison, then remove this prison. */ 2152 pr->pr_ref++; 2153 pr->pr_flags |= PR_REMOVE; 2154 if (!LIST_EMPTY(&pr->pr_children)) { 2155 mtx_unlock(&pr->pr_mtx); 2156 lpr = NULL; 2157 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2158 mtx_lock(&cpr->pr_mtx); 2159 if (cpr->pr_ref > 0) { 2160 tpr = cpr; 2161 cpr->pr_ref++; 2162 cpr->pr_flags |= PR_REMOVE; 2163 } else { 2164 /* Already removed - do not do it again. */ 2165 tpr = NULL; 2166 } 2167 mtx_unlock(&cpr->pr_mtx); 2168 if (lpr != NULL) { 2169 mtx_lock(&lpr->pr_mtx); 2170 prison_remove_one(lpr); 2171 sx_xlock(&allprison_lock); 2172 } 2173 lpr = tpr; 2174 } 2175 if (lpr != NULL) { 2176 mtx_lock(&lpr->pr_mtx); 2177 prison_remove_one(lpr); 2178 sx_xlock(&allprison_lock); 2179 } 2180 mtx_lock(&pr->pr_mtx); 2181 } 2182 prison_remove_one(pr); 2183 return (0); 2184 } 2185 2186 static void 2187 prison_remove_one(struct prison *pr) 2188 { 2189 struct proc *p; 2190 int deuref; 2191 2192 /* If the prison was persistent, it is not anymore. */ 2193 deuref = 0; 2194 if (pr->pr_flags & PR_PERSIST) { 2195 pr->pr_ref--; 2196 deuref = PD_DEUREF; 2197 pr->pr_flags &= ~PR_PERSIST; 2198 } 2199 2200 /* 2201 * jail_remove added a reference. If that's the only one, remove 2202 * the prison now. 2203 */ 2204 KASSERT(pr->pr_ref > 0, 2205 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2206 if (pr->pr_ref == 1) { 2207 prison_deref(pr, 2208 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2209 return; 2210 } 2211 2212 mtx_unlock(&pr->pr_mtx); 2213 sx_xunlock(&allprison_lock); 2214 /* 2215 * Kill all processes unfortunate enough to be attached to this prison. 2216 */ 2217 sx_slock(&allproc_lock); 2218 LIST_FOREACH(p, &allproc, p_list) { 2219 PROC_LOCK(p); 2220 if (p->p_state != PRS_NEW && p->p_ucred && 2221 p->p_ucred->cr_prison == pr) 2222 kern_psignal(p, SIGKILL); 2223 PROC_UNLOCK(p); 2224 } 2225 sx_sunlock(&allproc_lock); 2226 /* Remove the temporary reference added by jail_remove. */ 2227 prison_deref(pr, deuref | PD_DEREF); 2228 } 2229 2230 2231 /* 2232 * struct jail_attach_args { 2233 * int jid; 2234 * }; 2235 */ 2236 int 2237 sys_jail_attach(struct thread *td, struct jail_attach_args *uap) 2238 { 2239 struct prison *pr; 2240 int error; 2241 2242 error = priv_check(td, PRIV_JAIL_ATTACH); 2243 if (error) 2244 return (error); 2245 2246 sx_slock(&allprison_lock); 2247 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2248 if (pr == NULL) { 2249 sx_sunlock(&allprison_lock); 2250 return (EINVAL); 2251 } 2252 2253 /* 2254 * Do not allow a process to attach to a prison that is not 2255 * considered to be "alive". 2256 */ 2257 if (pr->pr_uref == 0) { 2258 mtx_unlock(&pr->pr_mtx); 2259 sx_sunlock(&allprison_lock); 2260 return (EINVAL); 2261 } 2262 2263 return (do_jail_attach(td, pr)); 2264 } 2265 2266 static int 2267 do_jail_attach(struct thread *td, struct prison *pr) 2268 { 2269 struct prison *ppr; 2270 struct proc *p; 2271 struct ucred *newcred, *oldcred; 2272 int vfslocked, error; 2273 2274 /* 2275 * XXX: Note that there is a slight race here if two threads 2276 * in the same privileged process attempt to attach to two 2277 * different jails at the same time. It is important for 2278 * user processes not to do this, or they might end up with 2279 * a process root from one prison, but attached to the jail 2280 * of another. 2281 */ 2282 pr->pr_ref++; 2283 pr->pr_uref++; 2284 mtx_unlock(&pr->pr_mtx); 2285 2286 /* Let modules do whatever they need to prepare for attaching. */ 2287 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2288 if (error) { 2289 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2290 return (error); 2291 } 2292 sx_sunlock(&allprison_lock); 2293 2294 /* 2295 * Reparent the newly attached process to this jail. 2296 */ 2297 ppr = td->td_ucred->cr_prison; 2298 p = td->td_proc; 2299 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2300 if (error) 2301 goto e_revert_osd; 2302 2303 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount); 2304 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2305 if ((error = change_dir(pr->pr_root, td)) != 0) 2306 goto e_unlock; 2307 #ifdef MAC 2308 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2309 goto e_unlock; 2310 #endif 2311 VOP_UNLOCK(pr->pr_root, 0); 2312 if ((error = change_root(pr->pr_root, td))) 2313 goto e_unlock_giant; 2314 VFS_UNLOCK_GIANT(vfslocked); 2315 2316 newcred = crget(); 2317 PROC_LOCK(p); 2318 oldcred = p->p_ucred; 2319 setsugid(p); 2320 crcopy(newcred, oldcred); 2321 newcred->cr_prison = pr; 2322 p->p_ucred = newcred; 2323 PROC_UNLOCK(p); 2324 #ifdef RACCT 2325 racct_proc_ucred_changed(p, oldcred, newcred); 2326 #endif 2327 crfree(oldcred); 2328 prison_deref(ppr, PD_DEREF | PD_DEUREF); 2329 return (0); 2330 e_unlock: 2331 VOP_UNLOCK(pr->pr_root, 0); 2332 e_unlock_giant: 2333 VFS_UNLOCK_GIANT(vfslocked); 2334 e_revert_osd: 2335 /* Tell modules this thread is still in its old jail after all. */ 2336 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td); 2337 prison_deref(pr, PD_DEREF | PD_DEUREF); 2338 return (error); 2339 } 2340 2341 2342 /* 2343 * Returns a locked prison instance, or NULL on failure. 2344 */ 2345 struct prison * 2346 prison_find(int prid) 2347 { 2348 struct prison *pr; 2349 2350 sx_assert(&allprison_lock, SX_LOCKED); 2351 TAILQ_FOREACH(pr, &allprison, pr_list) { 2352 if (pr->pr_id == prid) { 2353 mtx_lock(&pr->pr_mtx); 2354 if (pr->pr_ref > 0) 2355 return (pr); 2356 mtx_unlock(&pr->pr_mtx); 2357 } 2358 } 2359 return (NULL); 2360 } 2361 2362 /* 2363 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2364 */ 2365 struct prison * 2366 prison_find_child(struct prison *mypr, int prid) 2367 { 2368 struct prison *pr; 2369 int descend; 2370 2371 sx_assert(&allprison_lock, SX_LOCKED); 2372 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2373 if (pr->pr_id == prid) { 2374 mtx_lock(&pr->pr_mtx); 2375 if (pr->pr_ref > 0) 2376 return (pr); 2377 mtx_unlock(&pr->pr_mtx); 2378 } 2379 } 2380 return (NULL); 2381 } 2382 2383 /* 2384 * Look for the name relative to mypr. Returns a locked prison or NULL. 2385 */ 2386 struct prison * 2387 prison_find_name(struct prison *mypr, const char *name) 2388 { 2389 struct prison *pr, *deadpr; 2390 size_t mylen; 2391 int descend; 2392 2393 sx_assert(&allprison_lock, SX_LOCKED); 2394 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2395 again: 2396 deadpr = NULL; 2397 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2398 if (!strcmp(pr->pr_name + mylen, name)) { 2399 mtx_lock(&pr->pr_mtx); 2400 if (pr->pr_ref > 0) { 2401 if (pr->pr_uref > 0) 2402 return (pr); 2403 deadpr = pr; 2404 } 2405 mtx_unlock(&pr->pr_mtx); 2406 } 2407 } 2408 /* There was no valid prison - perhaps there was a dying one. */ 2409 if (deadpr != NULL) { 2410 mtx_lock(&deadpr->pr_mtx); 2411 if (deadpr->pr_ref == 0) { 2412 mtx_unlock(&deadpr->pr_mtx); 2413 goto again; 2414 } 2415 } 2416 return (deadpr); 2417 } 2418 2419 /* 2420 * See if a prison has the specific flag set. 2421 */ 2422 int 2423 prison_flag(struct ucred *cred, unsigned flag) 2424 { 2425 2426 /* This is an atomic read, so no locking is necessary. */ 2427 return (cred->cr_prison->pr_flags & flag); 2428 } 2429 2430 int 2431 prison_allow(struct ucred *cred, unsigned flag) 2432 { 2433 2434 /* This is an atomic read, so no locking is necessary. */ 2435 return (cred->cr_prison->pr_allow & flag); 2436 } 2437 2438 /* 2439 * Remove a prison reference. If that was the last reference, remove the 2440 * prison itself - but not in this context in case there are locks held. 2441 */ 2442 void 2443 prison_free_locked(struct prison *pr) 2444 { 2445 2446 mtx_assert(&pr->pr_mtx, MA_OWNED); 2447 pr->pr_ref--; 2448 if (pr->pr_ref == 0) { 2449 mtx_unlock(&pr->pr_mtx); 2450 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 2451 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2452 return; 2453 } 2454 mtx_unlock(&pr->pr_mtx); 2455 } 2456 2457 void 2458 prison_free(struct prison *pr) 2459 { 2460 2461 mtx_lock(&pr->pr_mtx); 2462 prison_free_locked(pr); 2463 } 2464 2465 static void 2466 prison_complete(void *context, int pending) 2467 { 2468 2469 prison_deref((struct prison *)context, 0); 2470 } 2471 2472 /* 2473 * Remove a prison reference (usually). This internal version assumes no 2474 * mutexes are held, except perhaps the prison itself. If there are no more 2475 * references, release and delist the prison. On completion, the prison lock 2476 * and the allprison lock are both unlocked. 2477 */ 2478 static void 2479 prison_deref(struct prison *pr, int flags) 2480 { 2481 struct prison *ppr, *tpr; 2482 int vfslocked; 2483 2484 if (!(flags & PD_LOCKED)) 2485 mtx_lock(&pr->pr_mtx); 2486 for (;;) { 2487 if (flags & PD_DEUREF) { 2488 pr->pr_uref--; 2489 KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0")); 2490 } 2491 if (flags & PD_DEREF) 2492 pr->pr_ref--; 2493 /* If the prison still has references, nothing else to do. */ 2494 if (pr->pr_ref > 0) { 2495 mtx_unlock(&pr->pr_mtx); 2496 if (flags & PD_LIST_SLOCKED) 2497 sx_sunlock(&allprison_lock); 2498 else if (flags & PD_LIST_XLOCKED) 2499 sx_xunlock(&allprison_lock); 2500 return; 2501 } 2502 2503 mtx_unlock(&pr->pr_mtx); 2504 if (flags & PD_LIST_SLOCKED) { 2505 if (!sx_try_upgrade(&allprison_lock)) { 2506 sx_sunlock(&allprison_lock); 2507 sx_xlock(&allprison_lock); 2508 } 2509 } else if (!(flags & PD_LIST_XLOCKED)) 2510 sx_xlock(&allprison_lock); 2511 2512 TAILQ_REMOVE(&allprison, pr, pr_list); 2513 LIST_REMOVE(pr, pr_sibling); 2514 ppr = pr->pr_parent; 2515 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2516 tpr->pr_childcount--; 2517 sx_xunlock(&allprison_lock); 2518 2519 #ifdef VIMAGE 2520 if (pr->pr_vnet != ppr->pr_vnet) 2521 vnet_destroy(pr->pr_vnet); 2522 #endif 2523 if (pr->pr_root != NULL) { 2524 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount); 2525 vrele(pr->pr_root); 2526 VFS_UNLOCK_GIANT(vfslocked); 2527 } 2528 mtx_destroy(&pr->pr_mtx); 2529 #ifdef INET 2530 free(pr->pr_ip4, M_PRISON); 2531 #endif 2532 #ifdef INET6 2533 free(pr->pr_ip6, M_PRISON); 2534 #endif 2535 if (pr->pr_cpuset != NULL) 2536 cpuset_rel(pr->pr_cpuset); 2537 osd_jail_exit(pr); 2538 #ifdef RACCT 2539 prison_racct_detach(pr); 2540 #endif 2541 free(pr, M_PRISON); 2542 2543 /* Removing a prison frees a reference on its parent. */ 2544 pr = ppr; 2545 mtx_lock(&pr->pr_mtx); 2546 flags = PD_DEREF | PD_DEUREF; 2547 } 2548 } 2549 2550 void 2551 prison_hold_locked(struct prison *pr) 2552 { 2553 2554 mtx_assert(&pr->pr_mtx, MA_OWNED); 2555 KASSERT(pr->pr_ref > 0, 2556 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2557 pr->pr_ref++; 2558 } 2559 2560 void 2561 prison_hold(struct prison *pr) 2562 { 2563 2564 mtx_lock(&pr->pr_mtx); 2565 prison_hold_locked(pr); 2566 mtx_unlock(&pr->pr_mtx); 2567 } 2568 2569 void 2570 prison_proc_hold(struct prison *pr) 2571 { 2572 2573 mtx_lock(&pr->pr_mtx); 2574 KASSERT(pr->pr_uref > 0, 2575 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2576 pr->pr_uref++; 2577 mtx_unlock(&pr->pr_mtx); 2578 } 2579 2580 void 2581 prison_proc_free(struct prison *pr) 2582 { 2583 2584 mtx_lock(&pr->pr_mtx); 2585 KASSERT(pr->pr_uref > 0, 2586 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2587 prison_deref(pr, PD_DEUREF | PD_LOCKED); 2588 } 2589 2590 2591 #ifdef INET 2592 /* 2593 * Restrict a prison's IP address list with its parent's, possibly replacing 2594 * it. Return true if the replacement buffer was used (or would have been). 2595 */ 2596 static int 2597 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2598 { 2599 int ii, ij, used; 2600 struct prison *ppr; 2601 2602 ppr = pr->pr_parent; 2603 if (!(pr->pr_flags & PR_IP4_USER)) { 2604 /* This has no user settings, so just copy the parent's list. */ 2605 if (pr->pr_ip4s < ppr->pr_ip4s) { 2606 /* 2607 * There's no room for the parent's list. Use the 2608 * new list buffer, which is assumed to be big enough 2609 * (if it was passed). If there's no buffer, try to 2610 * allocate one. 2611 */ 2612 used = 1; 2613 if (newip4 == NULL) { 2614 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2615 M_PRISON, M_NOWAIT); 2616 if (newip4 != NULL) 2617 used = 0; 2618 } 2619 if (newip4 != NULL) { 2620 bcopy(ppr->pr_ip4, newip4, 2621 ppr->pr_ip4s * sizeof(*newip4)); 2622 free(pr->pr_ip4, M_PRISON); 2623 pr->pr_ip4 = newip4; 2624 pr->pr_ip4s = ppr->pr_ip4s; 2625 } 2626 return (used); 2627 } 2628 pr->pr_ip4s = ppr->pr_ip4s; 2629 if (pr->pr_ip4s > 0) 2630 bcopy(ppr->pr_ip4, pr->pr_ip4, 2631 pr->pr_ip4s * sizeof(*newip4)); 2632 else if (pr->pr_ip4 != NULL) { 2633 free(pr->pr_ip4, M_PRISON); 2634 pr->pr_ip4 = NULL; 2635 } 2636 } else if (pr->pr_ip4s > 0) { 2637 /* Remove addresses that aren't in the parent. */ 2638 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2639 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2640 break; 2641 if (ij < ppr->pr_ip4s) 2642 ii = 1; 2643 else { 2644 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2645 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2646 ii = 0; 2647 } 2648 for (ij = 1; ii < pr->pr_ip4s; ) { 2649 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2650 ii++; 2651 continue; 2652 } 2653 switch (ij >= ppr->pr_ip4s ? -1 : 2654 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2655 case -1: 2656 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2657 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2658 break; 2659 case 0: 2660 ii++; 2661 ij++; 2662 break; 2663 case 1: 2664 ij++; 2665 break; 2666 } 2667 } 2668 if (pr->pr_ip4s == 0) { 2669 pr->pr_flags |= PR_IP4_DISABLE; 2670 free(pr->pr_ip4, M_PRISON); 2671 pr->pr_ip4 = NULL; 2672 } 2673 } 2674 return (0); 2675 } 2676 2677 /* 2678 * Pass back primary IPv4 address of this jail. 2679 * 2680 * If not restricted return success but do not alter the address. Caller has 2681 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2682 * 2683 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2684 * Address returned in NBO. 2685 */ 2686 int 2687 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2688 { 2689 struct prison *pr; 2690 2691 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2692 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2693 2694 pr = cred->cr_prison; 2695 if (!(pr->pr_flags & PR_IP4)) 2696 return (0); 2697 mtx_lock(&pr->pr_mtx); 2698 if (!(pr->pr_flags & PR_IP4)) { 2699 mtx_unlock(&pr->pr_mtx); 2700 return (0); 2701 } 2702 if (pr->pr_ip4 == NULL) { 2703 mtx_unlock(&pr->pr_mtx); 2704 return (EAFNOSUPPORT); 2705 } 2706 2707 ia->s_addr = pr->pr_ip4[0].s_addr; 2708 mtx_unlock(&pr->pr_mtx); 2709 return (0); 2710 } 2711 2712 /* 2713 * Return 1 if we should do proper source address selection or are not jailed. 2714 * We will return 0 if we should bypass source address selection in favour 2715 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2716 * returned in NBO. 2717 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2718 */ 2719 int 2720 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2721 { 2722 struct prison *pr; 2723 struct in_addr lia; 2724 int error; 2725 2726 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2727 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2728 2729 if (!jailed(cred)) 2730 return (1); 2731 2732 pr = cred->cr_prison; 2733 if (pr->pr_flags & PR_IP4_SADDRSEL) 2734 return (1); 2735 2736 lia.s_addr = INADDR_ANY; 2737 error = prison_get_ip4(cred, &lia); 2738 if (error) 2739 return (error); 2740 if (lia.s_addr == INADDR_ANY) 2741 return (1); 2742 2743 ia->s_addr = lia.s_addr; 2744 return (0); 2745 } 2746 2747 /* 2748 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2749 */ 2750 int 2751 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2752 { 2753 2754 if (pr1 == pr2) 2755 return (1); 2756 2757 /* 2758 * No need to lock since the PR_IP4_USER flag can't be altered for 2759 * existing prisons. 2760 */ 2761 while (pr1 != &prison0 && 2762 #ifdef VIMAGE 2763 !(pr1->pr_flags & PR_VNET) && 2764 #endif 2765 !(pr1->pr_flags & PR_IP4_USER)) 2766 pr1 = pr1->pr_parent; 2767 while (pr2 != &prison0 && 2768 #ifdef VIMAGE 2769 !(pr2->pr_flags & PR_VNET) && 2770 #endif 2771 !(pr2->pr_flags & PR_IP4_USER)) 2772 pr2 = pr2->pr_parent; 2773 return (pr1 == pr2); 2774 } 2775 2776 /* 2777 * Make sure our (source) address is set to something meaningful to this 2778 * jail. 2779 * 2780 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2781 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2782 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2783 */ 2784 int 2785 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2786 { 2787 struct prison *pr; 2788 struct in_addr ia0; 2789 int error; 2790 2791 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2792 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2793 2794 pr = cred->cr_prison; 2795 if (!(pr->pr_flags & PR_IP4)) 2796 return (0); 2797 mtx_lock(&pr->pr_mtx); 2798 if (!(pr->pr_flags & PR_IP4)) { 2799 mtx_unlock(&pr->pr_mtx); 2800 return (0); 2801 } 2802 if (pr->pr_ip4 == NULL) { 2803 mtx_unlock(&pr->pr_mtx); 2804 return (EAFNOSUPPORT); 2805 } 2806 2807 ia0.s_addr = ntohl(ia->s_addr); 2808 if (ia0.s_addr == INADDR_LOOPBACK) { 2809 ia->s_addr = pr->pr_ip4[0].s_addr; 2810 mtx_unlock(&pr->pr_mtx); 2811 return (0); 2812 } 2813 2814 if (ia0.s_addr == INADDR_ANY) { 2815 /* 2816 * In case there is only 1 IPv4 address, bind directly. 2817 */ 2818 if (pr->pr_ip4s == 1) 2819 ia->s_addr = pr->pr_ip4[0].s_addr; 2820 mtx_unlock(&pr->pr_mtx); 2821 return (0); 2822 } 2823 2824 error = _prison_check_ip4(pr, ia); 2825 mtx_unlock(&pr->pr_mtx); 2826 return (error); 2827 } 2828 2829 /* 2830 * Rewrite destination address in case we will connect to loopback address. 2831 * 2832 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2833 * Address passed in in NBO and returned in NBO. 2834 */ 2835 int 2836 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 2837 { 2838 struct prison *pr; 2839 2840 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2841 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2842 2843 pr = cred->cr_prison; 2844 if (!(pr->pr_flags & PR_IP4)) 2845 return (0); 2846 mtx_lock(&pr->pr_mtx); 2847 if (!(pr->pr_flags & PR_IP4)) { 2848 mtx_unlock(&pr->pr_mtx); 2849 return (0); 2850 } 2851 if (pr->pr_ip4 == NULL) { 2852 mtx_unlock(&pr->pr_mtx); 2853 return (EAFNOSUPPORT); 2854 } 2855 2856 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 2857 ia->s_addr = pr->pr_ip4[0].s_addr; 2858 mtx_unlock(&pr->pr_mtx); 2859 return (0); 2860 } 2861 2862 /* 2863 * Return success because nothing had to be changed. 2864 */ 2865 mtx_unlock(&pr->pr_mtx); 2866 return (0); 2867 } 2868 2869 /* 2870 * Check if given address belongs to the jail referenced by cred/prison. 2871 * 2872 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2873 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2874 * doesn't allow IPv4. Address passed in in NBO. 2875 */ 2876 static int 2877 _prison_check_ip4(struct prison *pr, struct in_addr *ia) 2878 { 2879 int i, a, z, d; 2880 2881 /* 2882 * Check the primary IP. 2883 */ 2884 if (pr->pr_ip4[0].s_addr == ia->s_addr) 2885 return (0); 2886 2887 /* 2888 * All the other IPs are sorted so we can do a binary search. 2889 */ 2890 a = 0; 2891 z = pr->pr_ip4s - 2; 2892 while (a <= z) { 2893 i = (a + z) / 2; 2894 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 2895 if (d > 0) 2896 z = i - 1; 2897 else if (d < 0) 2898 a = i + 1; 2899 else 2900 return (0); 2901 } 2902 2903 return (EADDRNOTAVAIL); 2904 } 2905 2906 int 2907 prison_check_ip4(struct ucred *cred, struct in_addr *ia) 2908 { 2909 struct prison *pr; 2910 int error; 2911 2912 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2913 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2914 2915 pr = cred->cr_prison; 2916 if (!(pr->pr_flags & PR_IP4)) 2917 return (0); 2918 mtx_lock(&pr->pr_mtx); 2919 if (!(pr->pr_flags & PR_IP4)) { 2920 mtx_unlock(&pr->pr_mtx); 2921 return (0); 2922 } 2923 if (pr->pr_ip4 == NULL) { 2924 mtx_unlock(&pr->pr_mtx); 2925 return (EAFNOSUPPORT); 2926 } 2927 2928 error = _prison_check_ip4(pr, ia); 2929 mtx_unlock(&pr->pr_mtx); 2930 return (error); 2931 } 2932 #endif 2933 2934 #ifdef INET6 2935 static int 2936 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 2937 { 2938 int ii, ij, used; 2939 struct prison *ppr; 2940 2941 ppr = pr->pr_parent; 2942 if (!(pr->pr_flags & PR_IP6_USER)) { 2943 /* This has no user settings, so just copy the parent's list. */ 2944 if (pr->pr_ip6s < ppr->pr_ip6s) { 2945 /* 2946 * There's no room for the parent's list. Use the 2947 * new list buffer, which is assumed to be big enough 2948 * (if it was passed). If there's no buffer, try to 2949 * allocate one. 2950 */ 2951 used = 1; 2952 if (newip6 == NULL) { 2953 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 2954 M_PRISON, M_NOWAIT); 2955 if (newip6 != NULL) 2956 used = 0; 2957 } 2958 if (newip6 != NULL) { 2959 bcopy(ppr->pr_ip6, newip6, 2960 ppr->pr_ip6s * sizeof(*newip6)); 2961 free(pr->pr_ip6, M_PRISON); 2962 pr->pr_ip6 = newip6; 2963 pr->pr_ip6s = ppr->pr_ip6s; 2964 } 2965 return (used); 2966 } 2967 pr->pr_ip6s = ppr->pr_ip6s; 2968 if (pr->pr_ip6s > 0) 2969 bcopy(ppr->pr_ip6, pr->pr_ip6, 2970 pr->pr_ip6s * sizeof(*newip6)); 2971 else if (pr->pr_ip6 != NULL) { 2972 free(pr->pr_ip6, M_PRISON); 2973 pr->pr_ip6 = NULL; 2974 } 2975 } else if (pr->pr_ip6s > 0) { 2976 /* Remove addresses that aren't in the parent. */ 2977 for (ij = 0; ij < ppr->pr_ip6s; ij++) 2978 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 2979 &ppr->pr_ip6[ij])) 2980 break; 2981 if (ij < ppr->pr_ip6s) 2982 ii = 1; 2983 else { 2984 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 2985 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2986 ii = 0; 2987 } 2988 for (ij = 1; ii < pr->pr_ip6s; ) { 2989 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 2990 &ppr->pr_ip6[0])) { 2991 ii++; 2992 continue; 2993 } 2994 switch (ij >= ppr->pr_ip4s ? -1 : 2995 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 2996 case -1: 2997 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 2998 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 2999 break; 3000 case 0: 3001 ii++; 3002 ij++; 3003 break; 3004 case 1: 3005 ij++; 3006 break; 3007 } 3008 } 3009 if (pr->pr_ip6s == 0) { 3010 pr->pr_flags |= PR_IP6_DISABLE; 3011 free(pr->pr_ip6, M_PRISON); 3012 pr->pr_ip6 = NULL; 3013 } 3014 } 3015 return 0; 3016 } 3017 3018 /* 3019 * Pass back primary IPv6 address for this jail. 3020 * 3021 * If not restricted return success but do not alter the address. Caller has 3022 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3023 * 3024 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3025 */ 3026 int 3027 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3028 { 3029 struct prison *pr; 3030 3031 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3032 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3033 3034 pr = cred->cr_prison; 3035 if (!(pr->pr_flags & PR_IP6)) 3036 return (0); 3037 mtx_lock(&pr->pr_mtx); 3038 if (!(pr->pr_flags & PR_IP6)) { 3039 mtx_unlock(&pr->pr_mtx); 3040 return (0); 3041 } 3042 if (pr->pr_ip6 == NULL) { 3043 mtx_unlock(&pr->pr_mtx); 3044 return (EAFNOSUPPORT); 3045 } 3046 3047 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3048 mtx_unlock(&pr->pr_mtx); 3049 return (0); 3050 } 3051 3052 /* 3053 * Return 1 if we should do proper source address selection or are not jailed. 3054 * We will return 0 if we should bypass source address selection in favour 3055 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3056 * returned in NBO. 3057 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3058 */ 3059 int 3060 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3061 { 3062 struct prison *pr; 3063 struct in6_addr lia6; 3064 int error; 3065 3066 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3067 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3068 3069 if (!jailed(cred)) 3070 return (1); 3071 3072 pr = cred->cr_prison; 3073 if (pr->pr_flags & PR_IP6_SADDRSEL) 3074 return (1); 3075 3076 lia6 = in6addr_any; 3077 error = prison_get_ip6(cred, &lia6); 3078 if (error) 3079 return (error); 3080 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3081 return (1); 3082 3083 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3084 return (0); 3085 } 3086 3087 /* 3088 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3089 */ 3090 int 3091 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3092 { 3093 3094 if (pr1 == pr2) 3095 return (1); 3096 3097 while (pr1 != &prison0 && 3098 #ifdef VIMAGE 3099 !(pr1->pr_flags & PR_VNET) && 3100 #endif 3101 !(pr1->pr_flags & PR_IP6_USER)) 3102 pr1 = pr1->pr_parent; 3103 while (pr2 != &prison0 && 3104 #ifdef VIMAGE 3105 !(pr2->pr_flags & PR_VNET) && 3106 #endif 3107 !(pr2->pr_flags & PR_IP6_USER)) 3108 pr2 = pr2->pr_parent; 3109 return (pr1 == pr2); 3110 } 3111 3112 /* 3113 * Make sure our (source) address is set to something meaningful to this jail. 3114 * 3115 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3116 * when needed while binding. 3117 * 3118 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3119 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3120 * doesn't allow IPv6. 3121 */ 3122 int 3123 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3124 { 3125 struct prison *pr; 3126 int error; 3127 3128 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3129 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3130 3131 pr = cred->cr_prison; 3132 if (!(pr->pr_flags & PR_IP6)) 3133 return (0); 3134 mtx_lock(&pr->pr_mtx); 3135 if (!(pr->pr_flags & PR_IP6)) { 3136 mtx_unlock(&pr->pr_mtx); 3137 return (0); 3138 } 3139 if (pr->pr_ip6 == NULL) { 3140 mtx_unlock(&pr->pr_mtx); 3141 return (EAFNOSUPPORT); 3142 } 3143 3144 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3145 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3146 mtx_unlock(&pr->pr_mtx); 3147 return (0); 3148 } 3149 3150 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3151 /* 3152 * In case there is only 1 IPv6 address, and v6only is true, 3153 * then bind directly. 3154 */ 3155 if (v6only != 0 && pr->pr_ip6s == 1) 3156 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3157 mtx_unlock(&pr->pr_mtx); 3158 return (0); 3159 } 3160 3161 error = _prison_check_ip6(pr, ia6); 3162 mtx_unlock(&pr->pr_mtx); 3163 return (error); 3164 } 3165 3166 /* 3167 * Rewrite destination address in case we will connect to loopback address. 3168 * 3169 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3170 */ 3171 int 3172 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3173 { 3174 struct prison *pr; 3175 3176 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3177 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3178 3179 pr = cred->cr_prison; 3180 if (!(pr->pr_flags & PR_IP6)) 3181 return (0); 3182 mtx_lock(&pr->pr_mtx); 3183 if (!(pr->pr_flags & PR_IP6)) { 3184 mtx_unlock(&pr->pr_mtx); 3185 return (0); 3186 } 3187 if (pr->pr_ip6 == NULL) { 3188 mtx_unlock(&pr->pr_mtx); 3189 return (EAFNOSUPPORT); 3190 } 3191 3192 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3193 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3194 mtx_unlock(&pr->pr_mtx); 3195 return (0); 3196 } 3197 3198 /* 3199 * Return success because nothing had to be changed. 3200 */ 3201 mtx_unlock(&pr->pr_mtx); 3202 return (0); 3203 } 3204 3205 /* 3206 * Check if given address belongs to the jail referenced by cred/prison. 3207 * 3208 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3209 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3210 * doesn't allow IPv6. 3211 */ 3212 static int 3213 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3214 { 3215 int i, a, z, d; 3216 3217 /* 3218 * Check the primary IP. 3219 */ 3220 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3221 return (0); 3222 3223 /* 3224 * All the other IPs are sorted so we can do a binary search. 3225 */ 3226 a = 0; 3227 z = pr->pr_ip6s - 2; 3228 while (a <= z) { 3229 i = (a + z) / 2; 3230 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3231 if (d > 0) 3232 z = i - 1; 3233 else if (d < 0) 3234 a = i + 1; 3235 else 3236 return (0); 3237 } 3238 3239 return (EADDRNOTAVAIL); 3240 } 3241 3242 int 3243 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3244 { 3245 struct prison *pr; 3246 int error; 3247 3248 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3249 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3250 3251 pr = cred->cr_prison; 3252 if (!(pr->pr_flags & PR_IP6)) 3253 return (0); 3254 mtx_lock(&pr->pr_mtx); 3255 if (!(pr->pr_flags & PR_IP6)) { 3256 mtx_unlock(&pr->pr_mtx); 3257 return (0); 3258 } 3259 if (pr->pr_ip6 == NULL) { 3260 mtx_unlock(&pr->pr_mtx); 3261 return (EAFNOSUPPORT); 3262 } 3263 3264 error = _prison_check_ip6(pr, ia6); 3265 mtx_unlock(&pr->pr_mtx); 3266 return (error); 3267 } 3268 #endif 3269 3270 /* 3271 * Check if a jail supports the given address family. 3272 * 3273 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3274 * if not. 3275 */ 3276 int 3277 prison_check_af(struct ucred *cred, int af) 3278 { 3279 struct prison *pr; 3280 int error; 3281 3282 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3283 3284 pr = cred->cr_prison; 3285 #ifdef VIMAGE 3286 /* Prisons with their own network stack are not limited. */ 3287 if (prison_owns_vnet(cred)) 3288 return (0); 3289 #endif 3290 3291 error = 0; 3292 switch (af) 3293 { 3294 #ifdef INET 3295 case AF_INET: 3296 if (pr->pr_flags & PR_IP4) 3297 { 3298 mtx_lock(&pr->pr_mtx); 3299 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3300 error = EAFNOSUPPORT; 3301 mtx_unlock(&pr->pr_mtx); 3302 } 3303 break; 3304 #endif 3305 #ifdef INET6 3306 case AF_INET6: 3307 if (pr->pr_flags & PR_IP6) 3308 { 3309 mtx_lock(&pr->pr_mtx); 3310 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3311 error = EAFNOSUPPORT; 3312 mtx_unlock(&pr->pr_mtx); 3313 } 3314 break; 3315 #endif 3316 case AF_LOCAL: 3317 case AF_ROUTE: 3318 break; 3319 default: 3320 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3321 error = EAFNOSUPPORT; 3322 } 3323 return (error); 3324 } 3325 3326 /* 3327 * Check if given address belongs to the jail referenced by cred (wrapper to 3328 * prison_check_ip[46]). 3329 * 3330 * Returns 0 if jail doesn't restrict the address family or if address belongs 3331 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3332 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3333 */ 3334 int 3335 prison_if(struct ucred *cred, struct sockaddr *sa) 3336 { 3337 #ifdef INET 3338 struct sockaddr_in *sai; 3339 #endif 3340 #ifdef INET6 3341 struct sockaddr_in6 *sai6; 3342 #endif 3343 int error; 3344 3345 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3346 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3347 3348 #ifdef VIMAGE 3349 if (prison_owns_vnet(cred)) 3350 return (0); 3351 #endif 3352 3353 error = 0; 3354 switch (sa->sa_family) 3355 { 3356 #ifdef INET 3357 case AF_INET: 3358 sai = (struct sockaddr_in *)sa; 3359 error = prison_check_ip4(cred, &sai->sin_addr); 3360 break; 3361 #endif 3362 #ifdef INET6 3363 case AF_INET6: 3364 sai6 = (struct sockaddr_in6 *)sa; 3365 error = prison_check_ip6(cred, &sai6->sin6_addr); 3366 break; 3367 #endif 3368 default: 3369 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3370 error = EAFNOSUPPORT; 3371 } 3372 return (error); 3373 } 3374 3375 /* 3376 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3377 */ 3378 int 3379 prison_check(struct ucred *cred1, struct ucred *cred2) 3380 { 3381 3382 return ((cred1->cr_prison == cred2->cr_prison || 3383 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3384 } 3385 3386 /* 3387 * Return 1 if p2 is a child of p1, otherwise 0. 3388 */ 3389 int 3390 prison_ischild(struct prison *pr1, struct prison *pr2) 3391 { 3392 3393 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3394 if (pr1 == pr2) 3395 return (1); 3396 return (0); 3397 } 3398 3399 /* 3400 * Return 1 if the passed credential is in a jail, otherwise 0. 3401 */ 3402 int 3403 jailed(struct ucred *cred) 3404 { 3405 3406 return (cred->cr_prison != &prison0); 3407 } 3408 3409 /* 3410 * Return 1 if the passed credential is in a jail and that jail does not 3411 * have its own virtual network stack, otherwise 0. 3412 */ 3413 int 3414 jailed_without_vnet(struct ucred *cred) 3415 { 3416 3417 if (!jailed(cred)) 3418 return (0); 3419 #ifdef VIMAGE 3420 if (prison_owns_vnet(cred)) 3421 return (0); 3422 #endif 3423 3424 return (1); 3425 } 3426 3427 /* 3428 * Return the correct hostname (domainname, et al) for the passed credential. 3429 */ 3430 void 3431 getcredhostname(struct ucred *cred, char *buf, size_t size) 3432 { 3433 struct prison *pr; 3434 3435 /* 3436 * A NULL credential can be used to shortcut to the physical 3437 * system's hostname. 3438 */ 3439 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3440 mtx_lock(&pr->pr_mtx); 3441 strlcpy(buf, pr->pr_hostname, size); 3442 mtx_unlock(&pr->pr_mtx); 3443 } 3444 3445 void 3446 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3447 { 3448 3449 mtx_lock(&cred->cr_prison->pr_mtx); 3450 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3451 mtx_unlock(&cred->cr_prison->pr_mtx); 3452 } 3453 3454 void 3455 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3456 { 3457 3458 mtx_lock(&cred->cr_prison->pr_mtx); 3459 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3460 mtx_unlock(&cred->cr_prison->pr_mtx); 3461 } 3462 3463 void 3464 getcredhostid(struct ucred *cred, unsigned long *hostid) 3465 { 3466 3467 mtx_lock(&cred->cr_prison->pr_mtx); 3468 *hostid = cred->cr_prison->pr_hostid; 3469 mtx_unlock(&cred->cr_prison->pr_mtx); 3470 } 3471 3472 #ifdef VIMAGE 3473 /* 3474 * Determine whether the prison represented by cred owns 3475 * its vnet rather than having it inherited. 3476 * 3477 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3478 */ 3479 int 3480 prison_owns_vnet(struct ucred *cred) 3481 { 3482 3483 /* 3484 * vnets cannot be added/removed after jail creation, 3485 * so no need to lock here. 3486 */ 3487 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3488 } 3489 #endif 3490 3491 /* 3492 * Determine whether the subject represented by cred can "see" 3493 * status of a mount point. 3494 * Returns: 0 for permitted, ENOENT otherwise. 3495 * XXX: This function should be called cr_canseemount() and should be 3496 * placed in kern_prot.c. 3497 */ 3498 int 3499 prison_canseemount(struct ucred *cred, struct mount *mp) 3500 { 3501 struct prison *pr; 3502 struct statfs *sp; 3503 size_t len; 3504 3505 pr = cred->cr_prison; 3506 if (pr->pr_enforce_statfs == 0) 3507 return (0); 3508 if (pr->pr_root->v_mount == mp) 3509 return (0); 3510 if (pr->pr_enforce_statfs == 2) 3511 return (ENOENT); 3512 /* 3513 * If jail's chroot directory is set to "/" we should be able to see 3514 * all mount-points from inside a jail. 3515 * This is ugly check, but this is the only situation when jail's 3516 * directory ends with '/'. 3517 */ 3518 if (strcmp(pr->pr_path, "/") == 0) 3519 return (0); 3520 len = strlen(pr->pr_path); 3521 sp = &mp->mnt_stat; 3522 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3523 return (ENOENT); 3524 /* 3525 * Be sure that we don't have situation where jail's root directory 3526 * is "/some/path" and mount point is "/some/pathpath". 3527 */ 3528 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3529 return (ENOENT); 3530 return (0); 3531 } 3532 3533 void 3534 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3535 { 3536 char jpath[MAXPATHLEN]; 3537 struct prison *pr; 3538 size_t len; 3539 3540 pr = cred->cr_prison; 3541 if (pr->pr_enforce_statfs == 0) 3542 return; 3543 if (prison_canseemount(cred, mp) != 0) { 3544 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3545 strlcpy(sp->f_mntonname, "[restricted]", 3546 sizeof(sp->f_mntonname)); 3547 return; 3548 } 3549 if (pr->pr_root->v_mount == mp) { 3550 /* 3551 * Clear current buffer data, so we are sure nothing from 3552 * the valid path left there. 3553 */ 3554 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3555 *sp->f_mntonname = '/'; 3556 return; 3557 } 3558 /* 3559 * If jail's chroot directory is set to "/" we should be able to see 3560 * all mount-points from inside a jail. 3561 */ 3562 if (strcmp(pr->pr_path, "/") == 0) 3563 return; 3564 len = strlen(pr->pr_path); 3565 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3566 /* 3567 * Clear current buffer data, so we are sure nothing from 3568 * the valid path left there. 3569 */ 3570 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3571 if (*jpath == '\0') { 3572 /* Should never happen. */ 3573 *sp->f_mntonname = '/'; 3574 } else { 3575 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3576 } 3577 } 3578 3579 /* 3580 * Check with permission for a specific privilege is granted within jail. We 3581 * have a specific list of accepted privileges; the rest are denied. 3582 */ 3583 int 3584 prison_priv_check(struct ucred *cred, int priv) 3585 { 3586 3587 if (!jailed(cred)) 3588 return (0); 3589 3590 #ifdef VIMAGE 3591 /* 3592 * Privileges specific to prisons with a virtual network stack. 3593 * There might be a duplicate entry here in case the privilege 3594 * is only granted conditionally in the legacy jail case. 3595 */ 3596 switch (priv) { 3597 #ifdef notyet 3598 /* 3599 * NFS-specific privileges. 3600 */ 3601 case PRIV_NFS_DAEMON: 3602 case PRIV_NFS_LOCKD: 3603 #endif 3604 /* 3605 * Network stack privileges. 3606 */ 3607 case PRIV_NET_BRIDGE: 3608 case PRIV_NET_GRE: 3609 case PRIV_NET_BPF: 3610 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3611 case PRIV_NET_ROUTE: 3612 case PRIV_NET_TAP: 3613 case PRIV_NET_SETIFMTU: 3614 case PRIV_NET_SETIFFLAGS: 3615 case PRIV_NET_SETIFCAP: 3616 case PRIV_NET_SETIFDESCR: 3617 case PRIV_NET_SETIFNAME : 3618 case PRIV_NET_SETIFMETRIC: 3619 case PRIV_NET_SETIFPHYS: 3620 case PRIV_NET_SETIFMAC: 3621 case PRIV_NET_ADDMULTI: 3622 case PRIV_NET_DELMULTI: 3623 case PRIV_NET_HWIOCTL: 3624 case PRIV_NET_SETLLADDR: 3625 case PRIV_NET_ADDIFGROUP: 3626 case PRIV_NET_DELIFGROUP: 3627 case PRIV_NET_IFCREATE: 3628 case PRIV_NET_IFDESTROY: 3629 case PRIV_NET_ADDIFADDR: 3630 case PRIV_NET_DELIFADDR: 3631 case PRIV_NET_LAGG: 3632 case PRIV_NET_GIF: 3633 case PRIV_NET_SETIFVNET: 3634 case PRIV_NET_SETIFFIB: 3635 3636 /* 3637 * 802.11-related privileges. 3638 */ 3639 case PRIV_NET80211_GETKEY: 3640 #ifdef notyet 3641 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3642 #endif 3643 3644 #ifdef notyet 3645 /* 3646 * AppleTalk privileges. 3647 */ 3648 case PRIV_NETATALK_RESERVEDPORT: 3649 3650 /* 3651 * ATM privileges. 3652 */ 3653 case PRIV_NETATM_CFG: 3654 case PRIV_NETATM_ADD: 3655 case PRIV_NETATM_DEL: 3656 case PRIV_NETATM_SET: 3657 3658 /* 3659 * Bluetooth privileges. 3660 */ 3661 case PRIV_NETBLUETOOTH_RAW: 3662 #endif 3663 3664 /* 3665 * Netgraph and netgraph module privileges. 3666 */ 3667 case PRIV_NETGRAPH_CONTROL: 3668 #ifdef notyet 3669 case PRIV_NETGRAPH_TTY: 3670 #endif 3671 3672 /* 3673 * IPv4 and IPv6 privileges. 3674 */ 3675 case PRIV_NETINET_IPFW: 3676 case PRIV_NETINET_DIVERT: 3677 case PRIV_NETINET_PF: 3678 case PRIV_NETINET_DUMMYNET: 3679 case PRIV_NETINET_CARP: 3680 case PRIV_NETINET_MROUTE: 3681 case PRIV_NETINET_RAW: 3682 case PRIV_NETINET_ADDRCTRL6: 3683 case PRIV_NETINET_ND6: 3684 case PRIV_NETINET_SCOPE6: 3685 case PRIV_NETINET_ALIFETIME6: 3686 case PRIV_NETINET_IPSEC: 3687 case PRIV_NETINET_BINDANY: 3688 3689 #ifdef notyet 3690 /* 3691 * IPX/SPX privileges. 3692 */ 3693 case PRIV_NETIPX_RESERVEDPORT: 3694 case PRIV_NETIPX_RAW: 3695 3696 /* 3697 * NCP privileges. 3698 */ 3699 case PRIV_NETNCP: 3700 3701 /* 3702 * SMB privileges. 3703 */ 3704 case PRIV_NETSMB: 3705 #endif 3706 3707 /* 3708 * No default: or deny here. 3709 * In case of no permit fall through to next switch(). 3710 */ 3711 if (cred->cr_prison->pr_flags & PR_VNET) 3712 return (0); 3713 } 3714 #endif /* VIMAGE */ 3715 3716 switch (priv) { 3717 3718 /* 3719 * Allow ktrace privileges for root in jail. 3720 */ 3721 case PRIV_KTRACE: 3722 3723 #if 0 3724 /* 3725 * Allow jailed processes to configure audit identity and 3726 * submit audit records (login, etc). In the future we may 3727 * want to further refine the relationship between audit and 3728 * jail. 3729 */ 3730 case PRIV_AUDIT_GETAUDIT: 3731 case PRIV_AUDIT_SETAUDIT: 3732 case PRIV_AUDIT_SUBMIT: 3733 #endif 3734 3735 /* 3736 * Allow jailed processes to manipulate process UNIX 3737 * credentials in any way they see fit. 3738 */ 3739 case PRIV_CRED_SETUID: 3740 case PRIV_CRED_SETEUID: 3741 case PRIV_CRED_SETGID: 3742 case PRIV_CRED_SETEGID: 3743 case PRIV_CRED_SETGROUPS: 3744 case PRIV_CRED_SETREUID: 3745 case PRIV_CRED_SETREGID: 3746 case PRIV_CRED_SETRESUID: 3747 case PRIV_CRED_SETRESGID: 3748 3749 /* 3750 * Jail implements visibility constraints already, so allow 3751 * jailed root to override uid/gid-based constraints. 3752 */ 3753 case PRIV_SEEOTHERGIDS: 3754 case PRIV_SEEOTHERUIDS: 3755 3756 /* 3757 * Jail implements inter-process debugging limits already, so 3758 * allow jailed root various debugging privileges. 3759 */ 3760 case PRIV_DEBUG_DIFFCRED: 3761 case PRIV_DEBUG_SUGID: 3762 case PRIV_DEBUG_UNPRIV: 3763 3764 /* 3765 * Allow jail to set various resource limits and login 3766 * properties, and for now, exceed process resource limits. 3767 */ 3768 case PRIV_PROC_LIMIT: 3769 case PRIV_PROC_SETLOGIN: 3770 case PRIV_PROC_SETRLIMIT: 3771 3772 /* 3773 * System V and POSIX IPC privileges are granted in jail. 3774 */ 3775 case PRIV_IPC_READ: 3776 case PRIV_IPC_WRITE: 3777 case PRIV_IPC_ADMIN: 3778 case PRIV_IPC_MSGSIZE: 3779 case PRIV_MQ_ADMIN: 3780 3781 /* 3782 * Jail operations within a jail work on child jails. 3783 */ 3784 case PRIV_JAIL_ATTACH: 3785 case PRIV_JAIL_SET: 3786 case PRIV_JAIL_REMOVE: 3787 3788 /* 3789 * Jail implements its own inter-process limits, so allow 3790 * root processes in jail to change scheduling on other 3791 * processes in the same jail. Likewise for signalling. 3792 */ 3793 case PRIV_SCHED_DIFFCRED: 3794 case PRIV_SCHED_CPUSET: 3795 case PRIV_SIGNAL_DIFFCRED: 3796 case PRIV_SIGNAL_SUGID: 3797 3798 /* 3799 * Allow jailed processes to write to sysctls marked as jail 3800 * writable. 3801 */ 3802 case PRIV_SYSCTL_WRITEJAIL: 3803 3804 /* 3805 * Allow root in jail to manage a variety of quota 3806 * properties. These should likely be conditional on a 3807 * configuration option. 3808 */ 3809 case PRIV_VFS_GETQUOTA: 3810 case PRIV_VFS_SETQUOTA: 3811 3812 /* 3813 * Since Jail relies on chroot() to implement file system 3814 * protections, grant many VFS privileges to root in jail. 3815 * Be careful to exclude mount-related and NFS-related 3816 * privileges. 3817 */ 3818 case PRIV_VFS_READ: 3819 case PRIV_VFS_WRITE: 3820 case PRIV_VFS_ADMIN: 3821 case PRIV_VFS_EXEC: 3822 case PRIV_VFS_LOOKUP: 3823 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3824 case PRIV_VFS_CHFLAGS_DEV: 3825 case PRIV_VFS_CHOWN: 3826 case PRIV_VFS_CHROOT: 3827 case PRIV_VFS_RETAINSUGID: 3828 case PRIV_VFS_FCHROOT: 3829 case PRIV_VFS_LINK: 3830 case PRIV_VFS_SETGID: 3831 case PRIV_VFS_STAT: 3832 case PRIV_VFS_STICKYFILE: 3833 return (0); 3834 3835 /* 3836 * Depending on the global setting, allow privilege of 3837 * setting system flags. 3838 */ 3839 case PRIV_VFS_SYSFLAGS: 3840 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3841 return (0); 3842 else 3843 return (EPERM); 3844 3845 /* 3846 * Depending on the global setting, allow privilege of 3847 * mounting/unmounting file systems. 3848 */ 3849 case PRIV_VFS_MOUNT: 3850 case PRIV_VFS_UNMOUNT: 3851 case PRIV_VFS_MOUNT_NONUSER: 3852 case PRIV_VFS_MOUNT_OWNER: 3853 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT && 3854 cred->cr_prison->pr_enforce_statfs < 2) 3855 return (0); 3856 else 3857 return (EPERM); 3858 3859 /* 3860 * Allow jailed root to bind reserved ports and reuse in-use 3861 * ports. 3862 */ 3863 case PRIV_NETINET_RESERVEDPORT: 3864 case PRIV_NETINET_REUSEPORT: 3865 return (0); 3866 3867 /* 3868 * Allow jailed root to set certian IPv4/6 (option) headers. 3869 */ 3870 case PRIV_NETINET_SETHDROPTS: 3871 return (0); 3872 3873 /* 3874 * Conditionally allow creating raw sockets in jail. 3875 */ 3876 case PRIV_NETINET_RAW: 3877 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3878 return (0); 3879 else 3880 return (EPERM); 3881 3882 /* 3883 * Since jail implements its own visibility limits on netstat 3884 * sysctls, allow getcred. This allows identd to work in 3885 * jail. 3886 */ 3887 case PRIV_NETINET_GETCRED: 3888 return (0); 3889 3890 /* 3891 * Allow jailed root to set loginclass. 3892 */ 3893 case PRIV_PROC_SETLOGINCLASS: 3894 return (0); 3895 3896 default: 3897 /* 3898 * In all remaining cases, deny the privilege request. This 3899 * includes almost all network privileges, many system 3900 * configuration privileges. 3901 */ 3902 return (EPERM); 3903 } 3904 } 3905 3906 /* 3907 * Return the part of pr2's name that is relative to pr1, or the whole name 3908 * if it does not directly follow. 3909 */ 3910 3911 char * 3912 prison_name(struct prison *pr1, struct prison *pr2) 3913 { 3914 char *name; 3915 3916 /* Jails see themselves as "0" (if they see themselves at all). */ 3917 if (pr1 == pr2) 3918 return "0"; 3919 name = pr2->pr_name; 3920 if (prison_ischild(pr1, pr2)) { 3921 /* 3922 * pr1 isn't locked (and allprison_lock may not be either) 3923 * so its length can't be counted on. But the number of dots 3924 * can be counted on - and counted. 3925 */ 3926 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3927 name = strchr(name, '.') + 1; 3928 } 3929 return (name); 3930 } 3931 3932 /* 3933 * Return the part of pr2's path that is relative to pr1, or the whole path 3934 * if it does not directly follow. 3935 */ 3936 static char * 3937 prison_path(struct prison *pr1, struct prison *pr2) 3938 { 3939 char *path1, *path2; 3940 int len1; 3941 3942 path1 = pr1->pr_path; 3943 path2 = pr2->pr_path; 3944 if (!strcmp(path1, "/")) 3945 return (path2); 3946 len1 = strlen(path1); 3947 if (strncmp(path1, path2, len1)) 3948 return (path2); 3949 if (path2[len1] == '\0') 3950 return "/"; 3951 if (path2[len1] == '/') 3952 return (path2 + len1); 3953 return (path2); 3954 } 3955 3956 3957 /* 3958 * Jail-related sysctls. 3959 */ 3960 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 3961 "Jails"); 3962 3963 static int 3964 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 3965 { 3966 struct xprison *xp; 3967 struct prison *pr, *cpr; 3968 #ifdef INET 3969 struct in_addr *ip4 = NULL; 3970 int ip4s = 0; 3971 #endif 3972 #ifdef INET6 3973 struct in6_addr *ip6 = NULL; 3974 int ip6s = 0; 3975 #endif 3976 int descend, error; 3977 3978 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 3979 pr = req->td->td_ucred->cr_prison; 3980 error = 0; 3981 sx_slock(&allprison_lock); 3982 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 3983 #if defined(INET) || defined(INET6) 3984 again: 3985 #endif 3986 mtx_lock(&cpr->pr_mtx); 3987 #ifdef INET 3988 if (cpr->pr_ip4s > 0) { 3989 if (ip4s < cpr->pr_ip4s) { 3990 ip4s = cpr->pr_ip4s; 3991 mtx_unlock(&cpr->pr_mtx); 3992 ip4 = realloc(ip4, ip4s * 3993 sizeof(struct in_addr), M_TEMP, M_WAITOK); 3994 goto again; 3995 } 3996 bcopy(cpr->pr_ip4, ip4, 3997 cpr->pr_ip4s * sizeof(struct in_addr)); 3998 } 3999 #endif 4000 #ifdef INET6 4001 if (cpr->pr_ip6s > 0) { 4002 if (ip6s < cpr->pr_ip6s) { 4003 ip6s = cpr->pr_ip6s; 4004 mtx_unlock(&cpr->pr_mtx); 4005 ip6 = realloc(ip6, ip6s * 4006 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 4007 goto again; 4008 } 4009 bcopy(cpr->pr_ip6, ip6, 4010 cpr->pr_ip6s * sizeof(struct in6_addr)); 4011 } 4012 #endif 4013 if (cpr->pr_ref == 0) { 4014 mtx_unlock(&cpr->pr_mtx); 4015 continue; 4016 } 4017 bzero(xp, sizeof(*xp)); 4018 xp->pr_version = XPRISON_VERSION; 4019 xp->pr_id = cpr->pr_id; 4020 xp->pr_state = cpr->pr_uref > 0 4021 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 4022 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4023 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4024 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4025 #ifdef INET 4026 xp->pr_ip4s = cpr->pr_ip4s; 4027 #endif 4028 #ifdef INET6 4029 xp->pr_ip6s = cpr->pr_ip6s; 4030 #endif 4031 mtx_unlock(&cpr->pr_mtx); 4032 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4033 if (error) 4034 break; 4035 #ifdef INET 4036 if (xp->pr_ip4s > 0) { 4037 error = SYSCTL_OUT(req, ip4, 4038 xp->pr_ip4s * sizeof(struct in_addr)); 4039 if (error) 4040 break; 4041 } 4042 #endif 4043 #ifdef INET6 4044 if (xp->pr_ip6s > 0) { 4045 error = SYSCTL_OUT(req, ip6, 4046 xp->pr_ip6s * sizeof(struct in6_addr)); 4047 if (error) 4048 break; 4049 } 4050 #endif 4051 } 4052 sx_sunlock(&allprison_lock); 4053 free(xp, M_TEMP); 4054 #ifdef INET 4055 free(ip4, M_TEMP); 4056 #endif 4057 #ifdef INET6 4058 free(ip6, M_TEMP); 4059 #endif 4060 return (error); 4061 } 4062 4063 SYSCTL_OID(_security_jail, OID_AUTO, list, 4064 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4065 sysctl_jail_list, "S", "List of active jails"); 4066 4067 static int 4068 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4069 { 4070 int error, injail; 4071 4072 injail = jailed(req->td->td_ucred); 4073 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4074 4075 return (error); 4076 } 4077 4078 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4079 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4080 sysctl_jail_jailed, "I", "Process in jail?"); 4081 4082 #if defined(INET) || defined(INET6) 4083 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4084 &jail_max_af_ips, 0, 4085 "Number of IP addresses a jail may have at most per address family"); 4086 #endif 4087 4088 /* 4089 * Default parameters for jail(2) compatability. For historical reasons, 4090 * the sysctl names have varying similarity to the parameter names. Prisons 4091 * just see their own parameters, and can't change them. 4092 */ 4093 static int 4094 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4095 { 4096 struct prison *pr; 4097 int allow, error, i; 4098 4099 pr = req->td->td_ucred->cr_prison; 4100 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4101 4102 /* Get the current flag value, and convert it to a boolean. */ 4103 i = (allow & arg2) ? 1 : 0; 4104 if (arg1 != NULL) 4105 i = !i; 4106 error = sysctl_handle_int(oidp, &i, 0, req); 4107 if (error || !req->newptr) 4108 return (error); 4109 i = i ? arg2 : 0; 4110 if (arg1 != NULL) 4111 i ^= arg2; 4112 /* 4113 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4114 * for writing. 4115 */ 4116 mtx_lock(&prison0.pr_mtx); 4117 jail_default_allow = (jail_default_allow & ~arg2) | i; 4118 mtx_unlock(&prison0.pr_mtx); 4119 return (0); 4120 } 4121 4122 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4123 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4124 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4125 "Processes in jail can set their hostnames"); 4126 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4127 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4128 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4129 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 4130 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4131 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4132 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4133 "Processes in jail can use System V IPC primitives"); 4134 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4135 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4136 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4137 "Prison root can create raw sockets"); 4138 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4139 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4140 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4141 "Processes in jail can alter system file flags"); 4142 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4143 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4144 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4145 "Processes in jail can mount/unmount jail-friendly file systems"); 4146 4147 static int 4148 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4149 { 4150 struct prison *pr; 4151 int level, error; 4152 4153 pr = req->td->td_ucred->cr_prison; 4154 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4155 error = sysctl_handle_int(oidp, &level, 0, req); 4156 if (error || !req->newptr) 4157 return (error); 4158 *(int *)arg1 = level; 4159 return (0); 4160 } 4161 4162 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4163 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4164 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4165 sysctl_jail_default_level, "I", 4166 "Processes in jail cannot see all mounted file systems"); 4167 4168 /* 4169 * Nodes to describe jail parameters. Maximum length of string parameters 4170 * is returned in the string itself, and the other parameters exist merely 4171 * to make themselves and their types known. 4172 */ 4173 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4174 "Jail parameters"); 4175 4176 int 4177 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4178 { 4179 int i; 4180 long l; 4181 size_t s; 4182 char numbuf[12]; 4183 4184 switch (oidp->oid_kind & CTLTYPE) 4185 { 4186 case CTLTYPE_LONG: 4187 case CTLTYPE_ULONG: 4188 l = 0; 4189 #ifdef SCTL_MASK32 4190 if (!(req->flags & SCTL_MASK32)) 4191 #endif 4192 return (SYSCTL_OUT(req, &l, sizeof(l))); 4193 case CTLTYPE_INT: 4194 case CTLTYPE_UINT: 4195 i = 0; 4196 return (SYSCTL_OUT(req, &i, sizeof(i))); 4197 case CTLTYPE_STRING: 4198 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2); 4199 return 4200 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4201 case CTLTYPE_STRUCT: 4202 s = (size_t)arg2; 4203 return (SYSCTL_OUT(req, &s, sizeof(s))); 4204 } 4205 return (0); 4206 } 4207 4208 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4209 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4210 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4211 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4212 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4213 "I", "Jail secure level"); 4214 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4215 "I", "Jail cannot see all mounted file systems"); 4216 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4217 "B", "Jail persistence"); 4218 #ifdef VIMAGE 4219 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4220 "E,jailsys", "Virtual network stack"); 4221 #endif 4222 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4223 "B", "Jail is in the process of shutting down"); 4224 4225 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4226 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4227 "I", "Current number of child jails"); 4228 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4229 "I", "Maximum number of child jails"); 4230 4231 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4232 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4233 "Jail hostname"); 4234 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4235 "Jail NIS domainname"); 4236 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4237 "Jail host UUID"); 4238 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4239 "LU", "Jail host ID"); 4240 4241 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4242 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4243 4244 #ifdef INET 4245 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4246 "Jail IPv4 address virtualization"); 4247 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4248 "S,in_addr,a", "Jail IPv4 addresses"); 4249 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4250 "B", "Do (not) use IPv4 source address selection rather than the " 4251 "primary jail IPv4 address."); 4252 #endif 4253 #ifdef INET6 4254 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4255 "Jail IPv6 address virtualization"); 4256 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4257 "S,in6_addr,a", "Jail IPv6 addresses"); 4258 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4259 "B", "Do (not) use IPv6 source address selection rather than the " 4260 "primary jail IPv6 address."); 4261 #endif 4262 4263 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4264 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4265 "B", "Jail may set hostname"); 4266 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4267 "B", "Jail may use SYSV IPC"); 4268 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4269 "B", "Jail may create raw sockets"); 4270 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4271 "B", "Jail may alter system file flags"); 4272 SYSCTL_JAIL_PARAM(_allow, mount, CTLTYPE_INT | CTLFLAG_RW, 4273 "B", "Jail may mount/unmount jail-friendly file systems"); 4274 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4275 "B", "Jail may set file quotas"); 4276 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4277 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4278 4279 void 4280 prison_racct_foreach(void (*callback)(struct racct *racct, 4281 void *arg2, void *arg3), void *arg2, void *arg3) 4282 { 4283 struct prison_racct *prr; 4284 4285 sx_slock(&allprison_lock); 4286 LIST_FOREACH(prr, &allprison_racct, prr_next) 4287 (callback)(prr->prr_racct, arg2, arg3); 4288 sx_sunlock(&allprison_lock); 4289 } 4290 4291 static struct prison_racct * 4292 prison_racct_find_locked(const char *name) 4293 { 4294 struct prison_racct *prr; 4295 4296 sx_assert(&allprison_lock, SA_XLOCKED); 4297 4298 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN) 4299 return (NULL); 4300 4301 LIST_FOREACH(prr, &allprison_racct, prr_next) { 4302 if (strcmp(name, prr->prr_name) != 0) 4303 continue; 4304 4305 /* Found prison_racct with a matching name? */ 4306 prison_racct_hold(prr); 4307 return (prr); 4308 } 4309 4310 /* Add new prison_racct. */ 4311 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK); 4312 racct_create(&prr->prr_racct); 4313 4314 strcpy(prr->prr_name, name); 4315 refcount_init(&prr->prr_refcount, 1); 4316 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next); 4317 4318 return (prr); 4319 } 4320 4321 struct prison_racct * 4322 prison_racct_find(const char *name) 4323 { 4324 struct prison_racct *prr; 4325 4326 sx_xlock(&allprison_lock); 4327 prr = prison_racct_find_locked(name); 4328 sx_xunlock(&allprison_lock); 4329 return (prr); 4330 } 4331 4332 void 4333 prison_racct_hold(struct prison_racct *prr) 4334 { 4335 4336 refcount_acquire(&prr->prr_refcount); 4337 } 4338 4339 void 4340 prison_racct_free(struct prison_racct *prr) 4341 { 4342 int old; 4343 4344 old = prr->prr_refcount; 4345 if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1)) 4346 return; 4347 4348 sx_xlock(&allprison_lock); 4349 if (refcount_release(&prr->prr_refcount)) { 4350 racct_destroy(&prr->prr_racct); 4351 LIST_REMOVE(prr, prr_next); 4352 sx_xunlock(&allprison_lock); 4353 free(prr, M_PRISON_RACCT); 4354 4355 return; 4356 } 4357 sx_xunlock(&allprison_lock); 4358 } 4359 4360 #ifdef RACCT 4361 static void 4362 prison_racct_attach(struct prison *pr) 4363 { 4364 struct prison_racct *prr; 4365 4366 prr = prison_racct_find_locked(pr->pr_name); 4367 KASSERT(prr != NULL, ("cannot find prison_racct")); 4368 4369 pr->pr_prison_racct = prr; 4370 } 4371 4372 static void 4373 prison_racct_detach(struct prison *pr) 4374 { 4375 prison_racct_free(pr->pr_prison_racct); 4376 pr->pr_prison_racct = NULL; 4377 } 4378 #endif /* RACCT */ 4379 4380 #ifdef DDB 4381 4382 static void 4383 db_show_prison(struct prison *pr) 4384 { 4385 int fi; 4386 #if defined(INET) || defined(INET6) 4387 int ii; 4388 #endif 4389 unsigned jsf; 4390 #ifdef INET6 4391 char ip6buf[INET6_ADDRSTRLEN]; 4392 #endif 4393 4394 db_printf("prison %p:\n", pr); 4395 db_printf(" jid = %d\n", pr->pr_id); 4396 db_printf(" name = %s\n", pr->pr_name); 4397 db_printf(" parent = %p\n", pr->pr_parent); 4398 db_printf(" ref = %d\n", pr->pr_ref); 4399 db_printf(" uref = %d\n", pr->pr_uref); 4400 db_printf(" path = %s\n", pr->pr_path); 4401 db_printf(" cpuset = %d\n", pr->pr_cpuset 4402 ? pr->pr_cpuset->cs_id : -1); 4403 #ifdef VIMAGE 4404 db_printf(" vnet = %p\n", pr->pr_vnet); 4405 #endif 4406 db_printf(" root = %p\n", pr->pr_root); 4407 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4408 db_printf(" children.max = %d\n", pr->pr_childmax); 4409 db_printf(" children.cur = %d\n", pr->pr_childcount); 4410 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4411 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4412 db_printf(" flags = 0x%x", pr->pr_flags); 4413 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4414 fi++) 4415 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4416 db_printf(" %s", pr_flag_names[fi]); 4417 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4418 fi++) { 4419 jsf = pr->pr_flags & 4420 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4421 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4422 pr_flag_jailsys[fi].disable && 4423 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4424 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4425 : "inherit"); 4426 } 4427 db_printf(" allow = 0x%x", pr->pr_allow); 4428 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4429 fi++) 4430 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4431 db_printf(" %s", pr_allow_names[fi]); 4432 db_printf("\n"); 4433 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4434 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4435 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4436 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4437 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4438 #ifdef INET 4439 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4440 for (ii = 0; ii < pr->pr_ip4s; ii++) 4441 db_printf(" %s %s\n", 4442 ii == 0 ? "ip4.addr =" : " ", 4443 inet_ntoa(pr->pr_ip4[ii])); 4444 #endif 4445 #ifdef INET6 4446 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4447 for (ii = 0; ii < pr->pr_ip6s; ii++) 4448 db_printf(" %s %s\n", 4449 ii == 0 ? "ip6.addr =" : " ", 4450 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4451 #endif 4452 } 4453 4454 DB_SHOW_COMMAND(prison, db_show_prison_command) 4455 { 4456 struct prison *pr; 4457 4458 if (!have_addr) { 4459 /* 4460 * Show all prisons in the list, and prison0 which is not 4461 * listed. 4462 */ 4463 db_show_prison(&prison0); 4464 if (!db_pager_quit) { 4465 TAILQ_FOREACH(pr, &allprison, pr_list) { 4466 db_show_prison(pr); 4467 if (db_pager_quit) 4468 break; 4469 } 4470 } 4471 return; 4472 } 4473 4474 if (addr == 0) 4475 pr = &prison0; 4476 else { 4477 /* Look for a prison with the ID and with references. */ 4478 TAILQ_FOREACH(pr, &allprison, pr_list) 4479 if (pr->pr_id == addr && pr->pr_ref > 0) 4480 break; 4481 if (pr == NULL) 4482 /* Look again, without requiring a reference. */ 4483 TAILQ_FOREACH(pr, &allprison, pr_list) 4484 if (pr->pr_id == addr) 4485 break; 4486 if (pr == NULL) 4487 /* Assume address points to a valid prison. */ 4488 pr = (struct prison *)addr; 4489 } 4490 db_show_prison(pr); 4491 } 4492 4493 #endif /* DDB */ 4494