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