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