Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_jail.c
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1 /*- 2 * Copyright (c) 1999 Poul-Henning Kamp. 3 * Copyright (c) 2008 Bjoern A. Zeeb. 4 * Copyright (c) 2009 James Gritton. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD: releng/8.3/sys/kern/kern_jail.c 231346 2012-02-10 06:42:00Z bz $"); 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/sx.h> 53 #include <sys/sysent.h> 54 #include <sys/namei.h> 55 #include <sys/mount.h> 56 #include <sys/queue.h> 57 #include <sys/socket.h> 58 #include <sys/syscallsubr.h> 59 #include <sys/sysctl.h> 60 #include <sys/vnode.h> 61 62 #include <net/if.h> 63 #include <net/vnet.h> 64 65 #include <netinet/in.h> 66 67 #ifdef DDB 68 #include <ddb/ddb.h> 69 #ifdef INET6 70 #include <netinet6/in6_var.h> 71 #endif /* INET6 */ 72 #endif /* DDB */ 73 74 #include <security/mac/mac_framework.h> 75 76 #define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 77 78 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 79 80 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 81 #ifdef INET 82 #ifdef INET6 83 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 84 #else 85 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 86 #endif 87 #else /* !INET */ 88 #ifdef INET6 89 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 90 #else 91 #define _PR_IP_SADDRSEL 0 92 #endif 93 #endif 94 95 /* prison0 describes what is "real" about the system. */ 96 struct prison prison0 = { 97 .pr_id = 0, 98 .pr_name = "", 99 .pr_ref = 1, 100 .pr_uref = 1, 101 .pr_path = "/", 102 .pr_securelevel = -1, 103 .pr_childmax = JAIL_MAX, 104 .pr_hostuuid = DEFAULT_HOSTUUID, 105 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 106 #ifdef VIMAGE 107 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 108 #else 109 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 110 #endif 111 .pr_allow = PR_ALLOW_ALL, 112 }; 113 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 114 115 /* allprison and lastprid are protected by allprison_lock. */ 116 struct sx allprison_lock; 117 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 118 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 119 int lastprid = 0; 120 121 static int do_jail_attach(struct thread *td, struct prison *pr); 122 static void prison_complete(void *context, int pending); 123 static void prison_deref(struct prison *pr, int flags); 124 static char *prison_path(struct prison *pr1, struct prison *pr2); 125 static void prison_remove_one(struct prison *pr); 126 #ifdef INET 127 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia); 128 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4); 129 #endif 130 #ifdef INET6 131 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6); 132 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6); 133 #endif 134 135 /* Flags for prison_deref */ 136 #define PD_DEREF 0x01 137 #define PD_DEUREF 0x02 138 #define PD_LOCKED 0x04 139 #define PD_LIST_SLOCKED 0x08 140 #define PD_LIST_XLOCKED 0x10 141 142 /* 143 * Parameter names corresponding to PR_* flag values. Size values are for kvm 144 * as we cannot figure out the size of a sparse array, or an array without a 145 * terminating entry. 146 */ 147 static char *pr_flag_names[] = { 148 [0] = "persist", 149 #ifdef INET 150 [7] = "ip4.saddrsel", 151 #endif 152 #ifdef INET6 153 [8] = "ip6.saddrsel", 154 #endif 155 }; 156 const size_t pr_flag_names_size = sizeof(pr_flag_names); 157 158 static char *pr_flag_nonames[] = { 159 [0] = "nopersist", 160 #ifdef INET 161 [7] = "ip4.nosaddrsel", 162 #endif 163 #ifdef INET6 164 [8] = "ip6.nosaddrsel", 165 #endif 166 }; 167 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames); 168 169 struct jailsys_flags { 170 const char *name; 171 unsigned disable; 172 unsigned new; 173 } pr_flag_jailsys[] = { 174 { "host", 0, PR_HOST }, 175 #ifdef VIMAGE 176 { "vnet", 0, PR_VNET }, 177 #endif 178 #ifdef INET 179 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER }, 180 #endif 181 #ifdef INET6 182 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER }, 183 #endif 184 }; 185 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys); 186 187 static char *pr_allow_names[] = { 188 "allow.set_hostname", 189 "allow.sysvipc", 190 "allow.raw_sockets", 191 "allow.chflags", 192 "allow.mount", 193 "allow.quotas", 194 "allow.socket_af", 195 }; 196 const size_t pr_allow_names_size = sizeof(pr_allow_names); 197 198 static char *pr_allow_nonames[] = { 199 "allow.noset_hostname", 200 "allow.nosysvipc", 201 "allow.noraw_sockets", 202 "allow.nochflags", 203 "allow.nomount", 204 "allow.noquotas", 205 "allow.nosocket_af", 206 }; 207 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames); 208 209 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME 210 #define JAIL_DEFAULT_ENFORCE_STATFS 2 211 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 212 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 213 #if defined(INET) || defined(INET6) 214 static unsigned jail_max_af_ips = 255; 215 #endif 216 217 #ifdef INET 218 static int 219 qcmp_v4(const void *ip1, const void *ip2) 220 { 221 in_addr_t iaa, iab; 222 223 /* 224 * We need to compare in HBO here to get the list sorted as expected 225 * by the result of the code. Sorting NBO addresses gives you 226 * interesting results. If you do not understand, do not try. 227 */ 228 iaa = ntohl(((const struct in_addr *)ip1)->s_addr); 229 iab = ntohl(((const struct in_addr *)ip2)->s_addr); 230 231 /* 232 * Do not simply return the difference of the two numbers, the int is 233 * not wide enough. 234 */ 235 if (iaa > iab) 236 return (1); 237 else if (iaa < iab) 238 return (-1); 239 else 240 return (0); 241 } 242 #endif 243 244 #ifdef INET6 245 static int 246 qcmp_v6(const void *ip1, const void *ip2) 247 { 248 const struct in6_addr *ia6a, *ia6b; 249 int i, rc; 250 251 ia6a = (const struct in6_addr *)ip1; 252 ia6b = (const struct in6_addr *)ip2; 253 254 rc = 0; 255 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { 256 if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) 257 rc = 1; 258 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) 259 rc = -1; 260 } 261 return (rc); 262 } 263 #endif 264 265 /* 266 * struct jail_args { 267 * struct jail *jail; 268 * }; 269 */ 270 int 271 jail(struct thread *td, struct jail_args *uap) 272 { 273 uint32_t version; 274 int error; 275 struct jail j; 276 277 error = copyin(uap->jail, &version, sizeof(uint32_t)); 278 if (error) 279 return (error); 280 281 switch (version) { 282 case 0: 283 { 284 struct jail_v0 j0; 285 286 /* FreeBSD single IPv4 jails. */ 287 bzero(&j, sizeof(struct jail)); 288 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 289 if (error) 290 return (error); 291 j.version = j0.version; 292 j.path = j0.path; 293 j.hostname = j0.hostname; 294 j.ip4s = j0.ip_number; 295 break; 296 } 297 298 case 1: 299 /* 300 * Version 1 was used by multi-IPv4 jail implementations 301 * that never made it into the official kernel. 302 */ 303 return (EINVAL); 304 305 case 2: /* JAIL_API_VERSION */ 306 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 307 error = copyin(uap->jail, &j, sizeof(struct jail)); 308 if (error) 309 return (error); 310 break; 311 312 default: 313 /* Sci-Fi jails are not supported, sorry. */ 314 return (EINVAL); 315 } 316 return (kern_jail(td, &j)); 317 } 318 319 int 320 kern_jail(struct thread *td, struct jail *j) 321 { 322 struct iovec optiov[2 * (4 323 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0]) 324 #ifdef INET 325 + 1 326 #endif 327 #ifdef INET6 328 + 1 329 #endif 330 )]; 331 struct uio opt; 332 char *u_path, *u_hostname, *u_name; 333 #ifdef INET 334 uint32_t ip4s; 335 struct in_addr *u_ip4; 336 #endif 337 #ifdef INET6 338 struct in6_addr *u_ip6; 339 #endif 340 size_t tmplen; 341 int error, enforce_statfs, fi; 342 343 bzero(&optiov, sizeof(optiov)); 344 opt.uio_iov = optiov; 345 opt.uio_iovcnt = 0; 346 opt.uio_offset = -1; 347 opt.uio_resid = -1; 348 opt.uio_segflg = UIO_SYSSPACE; 349 opt.uio_rw = UIO_READ; 350 opt.uio_td = td; 351 352 /* Set permissions for top-level jails from sysctls. */ 353 if (!jailed(td->td_ucred)) { 354 for (fi = 0; fi < sizeof(pr_allow_names) / 355 sizeof(pr_allow_names[0]); fi++) { 356 optiov[opt.uio_iovcnt].iov_base = 357 (jail_default_allow & (1 << fi)) 358 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 359 optiov[opt.uio_iovcnt].iov_len = 360 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 361 opt.uio_iovcnt += 2; 362 } 363 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 364 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 365 opt.uio_iovcnt++; 366 enforce_statfs = jail_default_enforce_statfs; 367 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 368 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 369 opt.uio_iovcnt++; 370 } 371 372 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 373 #ifdef INET 374 ip4s = (j->version == 0) ? 1 : j->ip4s; 375 if (ip4s > jail_max_af_ips) 376 return (EINVAL); 377 tmplen += ip4s * sizeof(struct in_addr); 378 #else 379 if (j->ip4s > 0) 380 return (EINVAL); 381 #endif 382 #ifdef INET6 383 if (j->ip6s > jail_max_af_ips) 384 return (EINVAL); 385 tmplen += j->ip6s * sizeof(struct in6_addr); 386 #else 387 if (j->ip6s > 0) 388 return (EINVAL); 389 #endif 390 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 391 u_hostname = u_path + MAXPATHLEN; 392 u_name = u_hostname + MAXHOSTNAMELEN; 393 #ifdef INET 394 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 395 #endif 396 #ifdef INET6 397 #ifdef INET 398 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 399 #else 400 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 401 #endif 402 #endif 403 optiov[opt.uio_iovcnt].iov_base = "path"; 404 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 405 opt.uio_iovcnt++; 406 optiov[opt.uio_iovcnt].iov_base = u_path; 407 error = copyinstr(j->path, u_path, MAXPATHLEN, 408 &optiov[opt.uio_iovcnt].iov_len); 409 if (error) { 410 free(u_path, M_TEMP); 411 return (error); 412 } 413 opt.uio_iovcnt++; 414 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 415 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 416 opt.uio_iovcnt++; 417 optiov[opt.uio_iovcnt].iov_base = u_hostname; 418 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 419 &optiov[opt.uio_iovcnt].iov_len); 420 if (error) { 421 free(u_path, M_TEMP); 422 return (error); 423 } 424 opt.uio_iovcnt++; 425 if (j->jailname != NULL) { 426 optiov[opt.uio_iovcnt].iov_base = "name"; 427 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 428 opt.uio_iovcnt++; 429 optiov[opt.uio_iovcnt].iov_base = u_name; 430 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 431 &optiov[opt.uio_iovcnt].iov_len); 432 if (error) { 433 free(u_path, M_TEMP); 434 return (error); 435 } 436 opt.uio_iovcnt++; 437 } 438 #ifdef INET 439 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 440 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 441 opt.uio_iovcnt++; 442 optiov[opt.uio_iovcnt].iov_base = u_ip4; 443 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 444 if (j->version == 0) 445 u_ip4->s_addr = j->ip4s; 446 else { 447 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 448 if (error) { 449 free(u_path, M_TEMP); 450 return (error); 451 } 452 } 453 opt.uio_iovcnt++; 454 #endif 455 #ifdef INET6 456 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 457 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 458 opt.uio_iovcnt++; 459 optiov[opt.uio_iovcnt].iov_base = u_ip6; 460 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 461 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 462 if (error) { 463 free(u_path, M_TEMP); 464 return (error); 465 } 466 opt.uio_iovcnt++; 467 #endif 468 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]), 469 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 470 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 471 free(u_path, M_TEMP); 472 return (error); 473 } 474 475 476 /* 477 * struct jail_set_args { 478 * struct iovec *iovp; 479 * unsigned int iovcnt; 480 * int flags; 481 * }; 482 */ 483 int 484 jail_set(struct thread *td, struct jail_set_args *uap) 485 { 486 struct uio *auio; 487 int error; 488 489 /* Check that we have an even number of iovecs. */ 490 if (uap->iovcnt & 1) 491 return (EINVAL); 492 493 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 494 if (error) 495 return (error); 496 error = kern_jail_set(td, auio, uap->flags); 497 free(auio, M_IOV); 498 return (error); 499 } 500 501 int 502 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 503 { 504 struct nameidata nd; 505 #ifdef INET 506 struct in_addr *ip4; 507 #endif 508 #ifdef INET6 509 struct in6_addr *ip6; 510 #endif 511 struct vfsopt *opt; 512 struct vfsoptlist *opts; 513 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 514 struct vnode *root; 515 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 516 #if defined(INET) || defined(INET6) 517 struct prison *tppr; 518 void *op; 519 #endif 520 unsigned long hid; 521 size_t namelen, onamelen; 522 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos; 523 int gotchildmax, gotenforce, gothid, gotslevel; 524 int fi, jid, jsys, len, level; 525 int childmax, slevel, vfslocked; 526 #if defined(INET) || defined(INET6) 527 int ii, ij; 528 #endif 529 #ifdef INET 530 int ip4s, redo_ip4; 531 #endif 532 #ifdef INET6 533 int ip6s, redo_ip6; 534 #endif 535 unsigned pr_flags, ch_flags; 536 unsigned pr_allow, ch_allow, tallow; 537 char numbuf[12]; 538 539 error = priv_check(td, PRIV_JAIL_SET); 540 if (!error && (flags & JAIL_ATTACH)) 541 error = priv_check(td, PRIV_JAIL_ATTACH); 542 if (error) 543 return (error); 544 mypr = ppr = td->td_ucred->cr_prison; 545 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 546 return (EPERM); 547 if (flags & ~JAIL_SET_MASK) 548 return (EINVAL); 549 550 /* 551 * Check all the parameters before committing to anything. Not all 552 * errors can be caught early, but we may as well try. Also, this 553 * takes care of some expensive stuff (path lookup) before getting 554 * the allprison lock. 555 * 556 * XXX Jails are not filesystems, and jail parameters are not mount 557 * options. But it makes more sense to re-use the vfsopt code 558 * than duplicate it under a different name. 559 */ 560 error = vfs_buildopts(optuio, &opts); 561 if (error) 562 return (error); 563 #ifdef INET 564 ip4 = NULL; 565 #endif 566 #ifdef INET6 567 ip6 = NULL; 568 #endif 569 570 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 571 if (error == ENOENT) 572 jid = 0; 573 else if (error != 0) 574 goto done_free; 575 576 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 577 if (error == ENOENT) 578 gotslevel = 0; 579 else if (error != 0) 580 goto done_free; 581 else 582 gotslevel = 1; 583 584 error = 585 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 586 if (error == ENOENT) 587 gotchildmax = 0; 588 else if (error != 0) 589 goto done_free; 590 else 591 gotchildmax = 1; 592 593 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 594 if (error == ENOENT) 595 gotenforce = 0; 596 else if (error != 0) 597 goto done_free; 598 else if (enforce < 0 || enforce > 2) { 599 error = EINVAL; 600 goto done_free; 601 } else 602 gotenforce = 1; 603 604 pr_flags = ch_flags = 0; 605 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 606 fi++) { 607 if (pr_flag_names[fi] == NULL) 608 continue; 609 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 610 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 611 } 612 ch_flags |= pr_flags; 613 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 614 fi++) { 615 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys, 616 sizeof(jsys)); 617 if (error == ENOENT) 618 continue; 619 if (error != 0) 620 goto done_free; 621 switch (jsys) { 622 case JAIL_SYS_DISABLE: 623 if (!pr_flag_jailsys[fi].disable) { 624 error = EINVAL; 625 goto done_free; 626 } 627 pr_flags |= pr_flag_jailsys[fi].disable; 628 break; 629 case JAIL_SYS_NEW: 630 pr_flags |= pr_flag_jailsys[fi].new; 631 break; 632 case JAIL_SYS_INHERIT: 633 break; 634 default: 635 error = EINVAL; 636 goto done_free; 637 } 638 ch_flags |= 639 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable; 640 } 641 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 642 && !(pr_flags & PR_PERSIST)) { 643 error = EINVAL; 644 vfs_opterror(opts, "new jail must persist or attach"); 645 goto done_errmsg; 646 } 647 #ifdef VIMAGE 648 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 649 error = EINVAL; 650 vfs_opterror(opts, "vnet cannot be changed after creation"); 651 goto done_errmsg; 652 } 653 #endif 654 #ifdef INET 655 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 656 error = EINVAL; 657 vfs_opterror(opts, "ip4 cannot be changed after creation"); 658 goto done_errmsg; 659 } 660 #endif 661 #ifdef INET6 662 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 663 error = EINVAL; 664 vfs_opterror(opts, "ip6 cannot be changed after creation"); 665 goto done_errmsg; 666 } 667 #endif 668 669 pr_allow = ch_allow = 0; 670 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 671 fi++) { 672 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 673 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 674 } 675 ch_allow |= pr_allow; 676 677 error = vfs_getopt(opts, "name", (void **)&name, &len); 678 if (error == ENOENT) 679 name = NULL; 680 else if (error != 0) 681 goto done_free; 682 else { 683 if (len == 0 || name[len - 1] != '\0') { 684 error = EINVAL; 685 goto done_free; 686 } 687 if (len > MAXHOSTNAMELEN) { 688 error = ENAMETOOLONG; 689 goto done_free; 690 } 691 } 692 693 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 694 if (error == ENOENT) 695 host = NULL; 696 else if (error != 0) 697 goto done_free; 698 else { 699 ch_flags |= PR_HOST; 700 pr_flags |= PR_HOST; 701 if (len == 0 || host[len - 1] != '\0') { 702 error = EINVAL; 703 goto done_free; 704 } 705 if (len > MAXHOSTNAMELEN) { 706 error = ENAMETOOLONG; 707 goto done_free; 708 } 709 } 710 711 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 712 if (error == ENOENT) 713 domain = NULL; 714 else if (error != 0) 715 goto done_free; 716 else { 717 ch_flags |= PR_HOST; 718 pr_flags |= PR_HOST; 719 if (len == 0 || domain[len - 1] != '\0') { 720 error = EINVAL; 721 goto done_free; 722 } 723 if (len > MAXHOSTNAMELEN) { 724 error = ENAMETOOLONG; 725 goto done_free; 726 } 727 } 728 729 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 730 if (error == ENOENT) 731 uuid = NULL; 732 else if (error != 0) 733 goto done_free; 734 else { 735 ch_flags |= PR_HOST; 736 pr_flags |= PR_HOST; 737 if (len == 0 || uuid[len - 1] != '\0') { 738 error = EINVAL; 739 goto done_free; 740 } 741 if (len > HOSTUUIDLEN) { 742 error = ENAMETOOLONG; 743 goto done_free; 744 } 745 } 746 747 #ifdef COMPAT_FREEBSD32 748 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 749 uint32_t hid32; 750 751 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 752 hid = hid32; 753 } else 754 #endif 755 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 756 if (error == ENOENT) 757 gothid = 0; 758 else if (error != 0) 759 goto done_free; 760 else { 761 gothid = 1; 762 ch_flags |= PR_HOST; 763 pr_flags |= PR_HOST; 764 } 765 766 #ifdef INET 767 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 768 if (error == ENOENT) 769 ip4s = (pr_flags & PR_IP4_DISABLE) ? 0 : -1; 770 else if (error != 0) 771 goto done_free; 772 else if (ip4s & (sizeof(*ip4) - 1)) { 773 error = EINVAL; 774 goto done_free; 775 } else { 776 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE; 777 if (ip4s == 0) 778 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE; 779 else { 780 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER; 781 ip4s /= sizeof(*ip4); 782 if (ip4s > jail_max_af_ips) { 783 error = EINVAL; 784 vfs_opterror(opts, "too many IPv4 addresses"); 785 goto done_errmsg; 786 } 787 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 788 bcopy(op, ip4, ip4s * sizeof(*ip4)); 789 /* 790 * IP addresses are all sorted but ip[0] to preserve 791 * the primary IP address as given from userland. 792 * This special IP is used for unbound outgoing 793 * connections as well for "loopback" traffic in case 794 * source address selection cannot find any more fitting 795 * address to connect from. 796 */ 797 if (ip4s > 1) 798 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4); 799 /* 800 * Check for duplicate addresses and do some simple 801 * zero and broadcast checks. If users give other bogus 802 * addresses it is their problem. 803 * 804 * We do not have to care about byte order for these 805 * checks so we will do them in NBO. 806 */ 807 for (ii = 0; ii < ip4s; ii++) { 808 if (ip4[ii].s_addr == INADDR_ANY || 809 ip4[ii].s_addr == INADDR_BROADCAST) { 810 error = EINVAL; 811 goto done_free; 812 } 813 if ((ii+1) < ip4s && 814 (ip4[0].s_addr == ip4[ii+1].s_addr || 815 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 816 error = EINVAL; 817 goto done_free; 818 } 819 } 820 } 821 } 822 #endif 823 824 #ifdef INET6 825 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 826 if (error == ENOENT) 827 ip6s = (pr_flags & PR_IP6_DISABLE) ? 0 : -1; 828 else if (error != 0) 829 goto done_free; 830 else if (ip6s & (sizeof(*ip6) - 1)) { 831 error = EINVAL; 832 goto done_free; 833 } else { 834 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE; 835 if (ip6s == 0) 836 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE; 837 else { 838 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER; 839 ip6s /= sizeof(*ip6); 840 if (ip6s > jail_max_af_ips) { 841 error = EINVAL; 842 vfs_opterror(opts, "too many IPv6 addresses"); 843 goto done_errmsg; 844 } 845 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 846 bcopy(op, ip6, ip6s * sizeof(*ip6)); 847 if (ip6s > 1) 848 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6); 849 for (ii = 0; ii < ip6s; ii++) { 850 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 851 error = EINVAL; 852 goto done_free; 853 } 854 if ((ii+1) < ip6s && 855 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 856 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 857 { 858 error = EINVAL; 859 goto done_free; 860 } 861 } 862 } 863 } 864 #endif 865 866 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 867 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 868 error = EINVAL; 869 vfs_opterror(opts, 870 "vnet jails cannot have IP address restrictions"); 871 goto done_errmsg; 872 } 873 #endif 874 875 root = NULL; 876 error = vfs_getopt(opts, "path", (void **)&path, &len); 877 if (error == ENOENT) 878 path = NULL; 879 else if (error != 0) 880 goto done_free; 881 else { 882 if (flags & JAIL_UPDATE) { 883 error = EINVAL; 884 vfs_opterror(opts, 885 "path cannot be changed after creation"); 886 goto done_errmsg; 887 } 888 if (len == 0 || path[len - 1] != '\0') { 889 error = EINVAL; 890 goto done_free; 891 } 892 if (len < 2 || (len == 2 && path[0] == '/')) 893 path = NULL; 894 else { 895 /* Leave room for a real-root full pathname. */ 896 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 897 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 898 error = ENAMETOOLONG; 899 goto done_free; 900 } 901 NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW, UIO_SYSSPACE, 902 path, td); 903 error = namei(&nd); 904 if (error) 905 goto done_free; 906 vfslocked = NDHASGIANT(&nd); 907 root = nd.ni_vp; 908 NDFREE(&nd, NDF_ONLY_PNBUF); 909 if (root->v_type != VDIR) { 910 error = ENOTDIR; 911 vrele(root); 912 VFS_UNLOCK_GIANT(vfslocked); 913 goto done_free; 914 } 915 VFS_UNLOCK_GIANT(vfslocked); 916 } 917 } 918 919 /* 920 * Grab the allprison lock before letting modules check their 921 * parameters. Once we have it, do not let go so we'll have a 922 * consistent view of the OSD list. 923 */ 924 sx_xlock(&allprison_lock); 925 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts); 926 if (error) 927 goto done_unlock_list; 928 929 /* By now, all parameters should have been noted. */ 930 TAILQ_FOREACH(opt, opts, link) { 931 if (!opt->seen && strcmp(opt->name, "errmsg")) { 932 error = EINVAL; 933 vfs_opterror(opts, "unknown parameter: %s", opt->name); 934 goto done_unlock_list; 935 } 936 } 937 938 /* 939 * See if we are creating a new record or updating an existing one. 940 * This abuses the file error codes ENOENT and EEXIST. 941 */ 942 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 943 if (!cuflags) { 944 error = EINVAL; 945 vfs_opterror(opts, "no valid operation (create or update)"); 946 goto done_unlock_list; 947 } 948 pr = NULL; 949 namelc = NULL; 950 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 951 namelc = strrchr(name, '.'); 952 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 953 if (*p != '\0') 954 jid = 0; 955 } 956 if (jid != 0) { 957 /* 958 * See if a requested jid already exists. There is an 959 * information leak here if the jid exists but is not within 960 * the caller's jail hierarchy. Jail creators will get EEXIST 961 * even though they cannot see the jail, and CREATE | UPDATE 962 * will return ENOENT which is not normally a valid error. 963 */ 964 if (jid < 0) { 965 error = EINVAL; 966 vfs_opterror(opts, "negative jid"); 967 goto done_unlock_list; 968 } 969 pr = prison_find(jid); 970 if (pr != NULL) { 971 ppr = pr->pr_parent; 972 /* Create: jid must not exist. */ 973 if (cuflags == JAIL_CREATE) { 974 mtx_unlock(&pr->pr_mtx); 975 error = EEXIST; 976 vfs_opterror(opts, "jail %d already exists", 977 jid); 978 goto done_unlock_list; 979 } 980 if (!prison_ischild(mypr, pr)) { 981 mtx_unlock(&pr->pr_mtx); 982 pr = NULL; 983 } else if (pr->pr_uref == 0) { 984 if (!(flags & JAIL_DYING)) { 985 mtx_unlock(&pr->pr_mtx); 986 error = ENOENT; 987 vfs_opterror(opts, "jail %d is dying", 988 jid); 989 goto done_unlock_list; 990 } else if ((flags & JAIL_ATTACH) || 991 (pr_flags & PR_PERSIST)) { 992 /* 993 * A dying jail might be resurrected 994 * (via attach or persist), but first 995 * it must determine if another jail 996 * has claimed its name. Accomplish 997 * this by implicitly re-setting the 998 * name. 999 */ 1000 if (name == NULL) 1001 name = prison_name(mypr, pr); 1002 } 1003 } 1004 } 1005 if (pr == NULL) { 1006 /* Update: jid must exist. */ 1007 if (cuflags == JAIL_UPDATE) { 1008 error = ENOENT; 1009 vfs_opterror(opts, "jail %d not found", jid); 1010 goto done_unlock_list; 1011 } 1012 } 1013 } 1014 /* 1015 * If the caller provided a name, look for a jail by that name. 1016 * This has different semantics for creates and updates keyed by jid 1017 * (where the name must not already exist in a different jail), 1018 * and updates keyed by the name itself (where the name must exist 1019 * because that is the jail being updated). 1020 */ 1021 if (name != NULL) { 1022 namelc = strrchr(name, '.'); 1023 if (namelc == NULL) 1024 namelc = name; 1025 else { 1026 /* 1027 * This is a hierarchical name. Split it into the 1028 * parent and child names, and make sure the parent 1029 * exists or matches an already found jail. 1030 */ 1031 *namelc = '\0'; 1032 if (pr != NULL) { 1033 if (strncmp(name, ppr->pr_name, namelc - name) 1034 || ppr->pr_name[namelc - name] != '\0') { 1035 mtx_unlock(&pr->pr_mtx); 1036 error = EINVAL; 1037 vfs_opterror(opts, 1038 "cannot change jail's parent"); 1039 goto done_unlock_list; 1040 } 1041 } else { 1042 ppr = prison_find_name(mypr, name); 1043 if (ppr == NULL) { 1044 error = ENOENT; 1045 vfs_opterror(opts, 1046 "jail \"%s\" not found", name); 1047 goto done_unlock_list; 1048 } 1049 mtx_unlock(&ppr->pr_mtx); 1050 } 1051 name = ++namelc; 1052 } 1053 if (name[0] != '\0') { 1054 namelen = 1055 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1056 name_again: 1057 deadpr = NULL; 1058 FOREACH_PRISON_CHILD(ppr, tpr) { 1059 if (tpr != pr && tpr->pr_ref > 0 && 1060 !strcmp(tpr->pr_name + namelen, name)) { 1061 if (pr == NULL && 1062 cuflags != JAIL_CREATE) { 1063 mtx_lock(&tpr->pr_mtx); 1064 if (tpr->pr_ref > 0) { 1065 /* 1066 * Use this jail 1067 * for updates. 1068 */ 1069 if (tpr->pr_uref > 0) { 1070 pr = tpr; 1071 break; 1072 } 1073 deadpr = tpr; 1074 } 1075 mtx_unlock(&tpr->pr_mtx); 1076 } else if (tpr->pr_uref > 0) { 1077 /* 1078 * Create, or update(jid): 1079 * name must not exist in an 1080 * active sibling jail. 1081 */ 1082 error = EEXIST; 1083 if (pr != NULL) 1084 mtx_unlock(&pr->pr_mtx); 1085 vfs_opterror(opts, 1086 "jail \"%s\" already exists", 1087 name); 1088 goto done_unlock_list; 1089 } 1090 } 1091 } 1092 /* If no active jail is found, use a dying one. */ 1093 if (deadpr != NULL && pr == NULL) { 1094 if (flags & JAIL_DYING) { 1095 mtx_lock(&deadpr->pr_mtx); 1096 if (deadpr->pr_ref == 0) { 1097 mtx_unlock(&deadpr->pr_mtx); 1098 goto name_again; 1099 } 1100 pr = deadpr; 1101 } else if (cuflags == JAIL_UPDATE) { 1102 error = ENOENT; 1103 vfs_opterror(opts, 1104 "jail \"%s\" is dying", name); 1105 goto done_unlock_list; 1106 } 1107 } 1108 /* Update: name must exist if no jid. */ 1109 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1110 error = ENOENT; 1111 vfs_opterror(opts, "jail \"%s\" not found", 1112 name); 1113 goto done_unlock_list; 1114 } 1115 } 1116 } 1117 /* Update: must provide a jid or name. */ 1118 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1119 error = ENOENT; 1120 vfs_opterror(opts, "update specified no jail"); 1121 goto done_unlock_list; 1122 } 1123 1124 /* If there's no prison to update, create a new one and link it in. */ 1125 if (pr == NULL) { 1126 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1127 if (tpr->pr_childcount >= tpr->pr_childmax) { 1128 error = EPERM; 1129 vfs_opterror(opts, "prison limit exceeded"); 1130 goto done_unlock_list; 1131 } 1132 created = 1; 1133 mtx_lock(&ppr->pr_mtx); 1134 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) { 1135 mtx_unlock(&ppr->pr_mtx); 1136 error = ENOENT; 1137 vfs_opterror(opts, "parent jail went away!"); 1138 goto done_unlock_list; 1139 } 1140 ppr->pr_ref++; 1141 ppr->pr_uref++; 1142 mtx_unlock(&ppr->pr_mtx); 1143 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1144 if (jid == 0) { 1145 /* Find the next free jid. */ 1146 jid = lastprid + 1; 1147 findnext: 1148 if (jid == JAIL_MAX) 1149 jid = 1; 1150 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1151 if (tpr->pr_id < jid) 1152 continue; 1153 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1154 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1155 break; 1156 } 1157 if (jid == lastprid) { 1158 error = EAGAIN; 1159 vfs_opterror(opts, 1160 "no available jail IDs"); 1161 free(pr, M_PRISON); 1162 prison_deref(ppr, PD_DEREF | 1163 PD_DEUREF | PD_LIST_XLOCKED); 1164 goto done_releroot; 1165 } 1166 jid++; 1167 goto findnext; 1168 } 1169 lastprid = jid; 1170 } else { 1171 /* 1172 * The jail already has a jid (that did not yet exist), 1173 * so just find where to insert it. 1174 */ 1175 TAILQ_FOREACH(tpr, &allprison, pr_list) 1176 if (tpr->pr_id >= jid) { 1177 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1178 break; 1179 } 1180 } 1181 if (tpr == NULL) 1182 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1183 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1184 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1185 tpr->pr_childcount++; 1186 1187 pr->pr_parent = ppr; 1188 pr->pr_id = jid; 1189 1190 /* Set some default values, and inherit some from the parent. */ 1191 if (name == NULL) 1192 name = ""; 1193 if (path == NULL) { 1194 path = "/"; 1195 root = mypr->pr_root; 1196 vref(root); 1197 } 1198 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1199 pr->pr_flags |= PR_HOST; 1200 #if defined(INET) || defined(INET6) 1201 #ifdef VIMAGE 1202 if (!(pr_flags & PR_VNET)) 1203 #endif 1204 { 1205 #ifdef INET 1206 if (!(ch_flags & PR_IP4_USER)) 1207 pr->pr_flags |= 1208 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE; 1209 else if (!(pr_flags & PR_IP4_USER)) { 1210 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1211 if (ppr->pr_ip4 != NULL) { 1212 pr->pr_ip4s = ppr->pr_ip4s; 1213 pr->pr_ip4 = malloc(pr->pr_ip4s * 1214 sizeof(struct in_addr), M_PRISON, 1215 M_WAITOK); 1216 bcopy(ppr->pr_ip4, pr->pr_ip4, 1217 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1218 } 1219 } 1220 #endif 1221 #ifdef INET6 1222 if (!(ch_flags & PR_IP6_USER)) 1223 pr->pr_flags |= 1224 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE; 1225 else if (!(pr_flags & PR_IP6_USER)) { 1226 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1227 if (ppr->pr_ip6 != NULL) { 1228 pr->pr_ip6s = ppr->pr_ip6s; 1229 pr->pr_ip6 = malloc(pr->pr_ip6s * 1230 sizeof(struct in6_addr), M_PRISON, 1231 M_WAITOK); 1232 bcopy(ppr->pr_ip6, pr->pr_ip6, 1233 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1234 } 1235 } 1236 #endif 1237 } 1238 #endif 1239 /* Source address selection is always on by default. */ 1240 pr->pr_flags |= _PR_IP_SADDRSEL; 1241 1242 pr->pr_securelevel = ppr->pr_securelevel; 1243 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1244 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 1245 1246 LIST_INIT(&pr->pr_children); 1247 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1248 1249 #ifdef VIMAGE 1250 /* Allocate a new vnet if specified. */ 1251 pr->pr_vnet = (pr_flags & PR_VNET) 1252 ? vnet_alloc() : ppr->pr_vnet; 1253 #endif 1254 /* 1255 * Allocate a dedicated cpuset for each jail. 1256 * Unlike other initial settings, this may return an erorr. 1257 */ 1258 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1259 if (error) { 1260 prison_deref(pr, PD_LIST_XLOCKED); 1261 goto done_releroot; 1262 } 1263 1264 mtx_lock(&pr->pr_mtx); 1265 /* 1266 * New prisons do not yet have a reference, because we do not 1267 * want other to see the incomplete prison once the 1268 * allprison_lock is downgraded. 1269 */ 1270 } else { 1271 created = 0; 1272 /* 1273 * Grab a reference for existing prisons, to ensure they 1274 * continue to exist for the duration of the call. 1275 */ 1276 pr->pr_ref++; 1277 #if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1278 if ((pr->pr_flags & PR_VNET) && 1279 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1280 error = EINVAL; 1281 vfs_opterror(opts, 1282 "vnet jails cannot have IP address restrictions"); 1283 goto done_deref_locked; 1284 } 1285 #endif 1286 #ifdef INET 1287 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1288 error = EINVAL; 1289 vfs_opterror(opts, 1290 "ip4 cannot be changed after creation"); 1291 goto done_deref_locked; 1292 } 1293 #endif 1294 #ifdef INET6 1295 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1296 error = EINVAL; 1297 vfs_opterror(opts, 1298 "ip6 cannot be changed after creation"); 1299 goto done_deref_locked; 1300 } 1301 #endif 1302 } 1303 1304 /* Do final error checking before setting anything. */ 1305 if (gotslevel) { 1306 if (slevel < ppr->pr_securelevel) { 1307 error = EPERM; 1308 goto done_deref_locked; 1309 } 1310 } 1311 if (gotchildmax) { 1312 if (childmax >= ppr->pr_childmax) { 1313 error = EPERM; 1314 goto done_deref_locked; 1315 } 1316 } 1317 if (gotenforce) { 1318 if (enforce < ppr->pr_enforce_statfs) { 1319 error = EPERM; 1320 goto done_deref_locked; 1321 } 1322 } 1323 #ifdef INET 1324 if (ip4s > 0) { 1325 if (ppr->pr_flags & PR_IP4) { 1326 /* 1327 * Make sure the new set of IP addresses is a 1328 * subset of the parent's list. Don't worry 1329 * about the parent being unlocked, as any 1330 * setting is done with allprison_lock held. 1331 */ 1332 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1333 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1334 break; 1335 if (ij == ppr->pr_ip4s) { 1336 error = EPERM; 1337 goto done_deref_locked; 1338 } 1339 if (ip4s > 1) { 1340 for (ii = ij = 1; ii < ip4s; ii++) { 1341 if (ip4[ii].s_addr == 1342 ppr->pr_ip4[0].s_addr) 1343 continue; 1344 for (; ij < ppr->pr_ip4s; ij++) 1345 if (ip4[ii].s_addr == 1346 ppr->pr_ip4[ij].s_addr) 1347 break; 1348 if (ij == ppr->pr_ip4s) 1349 break; 1350 } 1351 if (ij == ppr->pr_ip4s) { 1352 error = EPERM; 1353 goto done_deref_locked; 1354 } 1355 } 1356 } 1357 /* 1358 * Check for conflicting IP addresses. We permit them 1359 * if there is no more than one IP on each jail. If 1360 * there is a duplicate on a jail with more than one 1361 * IP stop checking and return error. 1362 */ 1363 tppr = ppr; 1364 #ifdef VIMAGE 1365 for (; tppr != &prison0; tppr = tppr->pr_parent) 1366 if (tppr->pr_flags & PR_VNET) 1367 break; 1368 #endif 1369 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1370 if (tpr == pr || 1371 #ifdef VIMAGE 1372 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1373 #endif 1374 tpr->pr_uref == 0) { 1375 descend = 0; 1376 continue; 1377 } 1378 if (!(tpr->pr_flags & PR_IP4_USER)) 1379 continue; 1380 descend = 0; 1381 if (tpr->pr_ip4 == NULL || 1382 (ip4s == 1 && tpr->pr_ip4s == 1)) 1383 continue; 1384 for (ii = 0; ii < ip4s; ii++) { 1385 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1386 error = EADDRINUSE; 1387 vfs_opterror(opts, 1388 "IPv4 addresses clash"); 1389 goto done_deref_locked; 1390 } 1391 } 1392 } 1393 } 1394 #endif 1395 #ifdef INET6 1396 if (ip6s > 0) { 1397 if (ppr->pr_flags & PR_IP6) { 1398 /* 1399 * Make sure the new set of IP addresses is a 1400 * subset of the parent's list. 1401 */ 1402 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1403 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1404 &ppr->pr_ip6[ij])) 1405 break; 1406 if (ij == ppr->pr_ip6s) { 1407 error = EPERM; 1408 goto done_deref_locked; 1409 } 1410 if (ip6s > 1) { 1411 for (ii = ij = 1; ii < ip6s; ii++) { 1412 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1413 &ppr->pr_ip6[0])) 1414 continue; 1415 for (; ij < ppr->pr_ip6s; ij++) 1416 if (IN6_ARE_ADDR_EQUAL( 1417 &ip6[ii], &ppr->pr_ip6[ij])) 1418 break; 1419 if (ij == ppr->pr_ip6s) 1420 break; 1421 } 1422 if (ij == ppr->pr_ip6s) { 1423 error = EPERM; 1424 goto done_deref_locked; 1425 } 1426 } 1427 } 1428 /* Check for conflicting IP addresses. */ 1429 tppr = ppr; 1430 #ifdef VIMAGE 1431 for (; tppr != &prison0; tppr = tppr->pr_parent) 1432 if (tppr->pr_flags & PR_VNET) 1433 break; 1434 #endif 1435 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1436 if (tpr == pr || 1437 #ifdef VIMAGE 1438 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1439 #endif 1440 tpr->pr_uref == 0) { 1441 descend = 0; 1442 continue; 1443 } 1444 if (!(tpr->pr_flags & PR_IP6_USER)) 1445 continue; 1446 descend = 0; 1447 if (tpr->pr_ip6 == NULL || 1448 (ip6s == 1 && tpr->pr_ip6s == 1)) 1449 continue; 1450 for (ii = 0; ii < ip6s; ii++) { 1451 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1452 error = EADDRINUSE; 1453 vfs_opterror(opts, 1454 "IPv6 addresses clash"); 1455 goto done_deref_locked; 1456 } 1457 } 1458 } 1459 } 1460 #endif 1461 onamelen = namelen = 0; 1462 if (name != NULL) { 1463 /* Give a default name of the jid. */ 1464 if (name[0] == '\0') 1465 snprintf(name = numbuf, sizeof(numbuf), "%d", jid); 1466 else if (*namelc == '' || (strtoul(namelc, &p, 10) != jid && 1467 *p == '\0')) { 1468 error = EINVAL; 1469 vfs_opterror(opts, 1470 "name cannot be numeric (unless it is the jid)"); 1471 goto done_deref_locked; 1472 } 1473 /* 1474 * Make sure the name isn't too long for the prison or its 1475 * children. 1476 */ 1477 onamelen = strlen(pr->pr_name); 1478 namelen = strlen(name); 1479 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) { 1480 error = ENAMETOOLONG; 1481 goto done_deref_locked; 1482 } 1483 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1484 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1485 sizeof(pr->pr_name)) { 1486 error = ENAMETOOLONG; 1487 goto done_deref_locked; 1488 } 1489 } 1490 } 1491 if (pr_allow & ~ppr->pr_allow) { 1492 error = EPERM; 1493 goto done_deref_locked; 1494 } 1495 1496 /* Set the parameters of the prison. */ 1497 #ifdef INET 1498 redo_ip4 = 0; 1499 if (pr_flags & PR_IP4_USER) { 1500 pr->pr_flags |= PR_IP4; 1501 free(pr->pr_ip4, M_PRISON); 1502 pr->pr_ip4s = ip4s; 1503 pr->pr_ip4 = ip4; 1504 ip4 = NULL; 1505 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1506 #ifdef VIMAGE 1507 if (tpr->pr_flags & PR_VNET) { 1508 descend = 0; 1509 continue; 1510 } 1511 #endif 1512 if (prison_restrict_ip4(tpr, NULL)) { 1513 redo_ip4 = 1; 1514 descend = 0; 1515 } 1516 } 1517 } 1518 #endif 1519 #ifdef INET6 1520 redo_ip6 = 0; 1521 if (pr_flags & PR_IP6_USER) { 1522 pr->pr_flags |= PR_IP6; 1523 free(pr->pr_ip6, M_PRISON); 1524 pr->pr_ip6s = ip6s; 1525 pr->pr_ip6 = ip6; 1526 ip6 = NULL; 1527 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1528 #ifdef VIMAGE 1529 if (tpr->pr_flags & PR_VNET) { 1530 descend = 0; 1531 continue; 1532 } 1533 #endif 1534 if (prison_restrict_ip6(tpr, NULL)) { 1535 redo_ip6 = 1; 1536 descend = 0; 1537 } 1538 } 1539 } 1540 #endif 1541 if (gotslevel) { 1542 pr->pr_securelevel = slevel; 1543 /* Set all child jails to be at least this level. */ 1544 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1545 if (tpr->pr_securelevel < slevel) 1546 tpr->pr_securelevel = slevel; 1547 } 1548 if (gotchildmax) { 1549 pr->pr_childmax = childmax; 1550 /* Set all child jails to under this limit. */ 1551 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1552 if (tpr->pr_childmax > childmax - level) 1553 tpr->pr_childmax = childmax > level 1554 ? childmax - level : 0; 1555 } 1556 if (gotenforce) { 1557 pr->pr_enforce_statfs = enforce; 1558 /* Pass this restriction on to the children. */ 1559 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1560 if (tpr->pr_enforce_statfs < enforce) 1561 tpr->pr_enforce_statfs = enforce; 1562 } 1563 if (name != NULL) { 1564 if (ppr == &prison0) 1565 strlcpy(pr->pr_name, name, sizeof(pr->pr_name)); 1566 else 1567 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1568 ppr->pr_name, name); 1569 /* Change this component of child names. */ 1570 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1571 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1572 strlen(tpr->pr_name + onamelen) + 1); 1573 bcopy(pr->pr_name, tpr->pr_name, namelen); 1574 } 1575 } 1576 if (path != NULL) { 1577 /* Try to keep a real-rooted full pathname. */ 1578 if (path[0] == '/' && strcmp(mypr->pr_path, "/")) 1579 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1580 mypr->pr_path, path); 1581 else 1582 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1583 pr->pr_root = root; 1584 } 1585 if (PR_HOST & ch_flags & ~pr_flags) { 1586 if (pr->pr_flags & PR_HOST) { 1587 /* 1588 * Copy the parent's host info. As with pr_ip4 above, 1589 * the lack of a lock on the parent is not a problem; 1590 * it is always set with allprison_lock at least 1591 * shared, and is held exclusively here. 1592 */ 1593 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1594 sizeof(pr->pr_hostname)); 1595 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1596 sizeof(pr->pr_domainname)); 1597 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1598 sizeof(pr->pr_hostuuid)); 1599 pr->pr_hostid = pr->pr_parent->pr_hostid; 1600 } 1601 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1602 /* Set this prison, and any descendants without PR_HOST. */ 1603 if (host != NULL) 1604 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1605 if (domain != NULL) 1606 strlcpy(pr->pr_domainname, domain, 1607 sizeof(pr->pr_domainname)); 1608 if (uuid != NULL) 1609 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1610 if (gothid) 1611 pr->pr_hostid = hid; 1612 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1613 if (tpr->pr_flags & PR_HOST) 1614 descend = 0; 1615 else { 1616 if (host != NULL) 1617 strlcpy(tpr->pr_hostname, 1618 pr->pr_hostname, 1619 sizeof(tpr->pr_hostname)); 1620 if (domain != NULL) 1621 strlcpy(tpr->pr_domainname, 1622 pr->pr_domainname, 1623 sizeof(tpr->pr_domainname)); 1624 if (uuid != NULL) 1625 strlcpy(tpr->pr_hostuuid, 1626 pr->pr_hostuuid, 1627 sizeof(tpr->pr_hostuuid)); 1628 if (gothid) 1629 tpr->pr_hostid = hid; 1630 } 1631 } 1632 } 1633 if ((tallow = ch_allow & ~pr_allow)) { 1634 /* Clear allow bits in all children. */ 1635 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1636 tpr->pr_allow &= ~tallow; 1637 } 1638 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1639 /* 1640 * Persistent prisons get an extra reference, and prisons losing their 1641 * persist flag lose that reference. Only do this for existing prisons 1642 * for now, so new ones will remain unseen until after the module 1643 * handlers have completed. 1644 */ 1645 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1646 if (pr_flags & PR_PERSIST) { 1647 pr->pr_ref++; 1648 pr->pr_uref++; 1649 } else { 1650 pr->pr_ref--; 1651 pr->pr_uref--; 1652 } 1653 } 1654 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1655 mtx_unlock(&pr->pr_mtx); 1656 1657 /* Locks may have prevented a complete restriction of child IP 1658 * addresses. If so, allocate some more memory and try again. 1659 */ 1660 #ifdef INET 1661 while (redo_ip4) { 1662 ip4s = pr->pr_ip4s; 1663 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1664 mtx_lock(&pr->pr_mtx); 1665 redo_ip4 = 0; 1666 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1667 #ifdef VIMAGE 1668 if (tpr->pr_flags & PR_VNET) { 1669 descend = 0; 1670 continue; 1671 } 1672 #endif 1673 if (prison_restrict_ip4(tpr, ip4)) { 1674 if (ip4 != NULL) 1675 ip4 = NULL; 1676 else 1677 redo_ip4 = 1; 1678 } 1679 } 1680 mtx_unlock(&pr->pr_mtx); 1681 } 1682 #endif 1683 #ifdef INET6 1684 while (redo_ip6) { 1685 ip6s = pr->pr_ip6s; 1686 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1687 mtx_lock(&pr->pr_mtx); 1688 redo_ip6 = 0; 1689 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1690 #ifdef VIMAGE 1691 if (tpr->pr_flags & PR_VNET) { 1692 descend = 0; 1693 continue; 1694 } 1695 #endif 1696 if (prison_restrict_ip6(tpr, ip6)) { 1697 if (ip6 != NULL) 1698 ip6 = NULL; 1699 else 1700 redo_ip6 = 1; 1701 } 1702 } 1703 mtx_unlock(&pr->pr_mtx); 1704 } 1705 #endif 1706 1707 /* Let the modules do their work. */ 1708 sx_downgrade(&allprison_lock); 1709 if (created) { 1710 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1711 if (error) { 1712 prison_deref(pr, PD_LIST_SLOCKED); 1713 goto done_errmsg; 1714 } 1715 } 1716 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1717 if (error) { 1718 prison_deref(pr, created 1719 ? PD_LIST_SLOCKED 1720 : PD_DEREF | PD_LIST_SLOCKED); 1721 goto done_errmsg; 1722 } 1723 1724 /* Attach this process to the prison if requested. */ 1725 if (flags & JAIL_ATTACH) { 1726 mtx_lock(&pr->pr_mtx); 1727 error = do_jail_attach(td, pr); 1728 if (error) { 1729 vfs_opterror(opts, "attach failed"); 1730 if (!created) 1731 prison_deref(pr, PD_DEREF); 1732 goto done_errmsg; 1733 } 1734 } 1735 1736 /* 1737 * Now that it is all there, drop the temporary reference from existing 1738 * prisons. Or add a reference to newly created persistent prisons 1739 * (which was not done earlier so that the prison would not be publicly 1740 * visible). 1741 */ 1742 if (!created) { 1743 prison_deref(pr, (flags & JAIL_ATTACH) 1744 ? PD_DEREF 1745 : PD_DEREF | PD_LIST_SLOCKED); 1746 } else { 1747 if (pr_flags & PR_PERSIST) { 1748 mtx_lock(&pr->pr_mtx); 1749 pr->pr_ref++; 1750 pr->pr_uref++; 1751 mtx_unlock(&pr->pr_mtx); 1752 } 1753 if (!(flags & JAIL_ATTACH)) 1754 sx_sunlock(&allprison_lock); 1755 } 1756 td->td_retval[0] = pr->pr_id; 1757 goto done_errmsg; 1758 1759 done_deref_locked: 1760 prison_deref(pr, created 1761 ? PD_LOCKED | PD_LIST_XLOCKED 1762 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1763 goto done_releroot; 1764 done_unlock_list: 1765 sx_xunlock(&allprison_lock); 1766 done_releroot: 1767 if (root != NULL) { 1768 vfslocked = VFS_LOCK_GIANT(root->v_mount); 1769 vrele(root); 1770 VFS_UNLOCK_GIANT(vfslocked); 1771 } 1772 done_errmsg: 1773 if (error) { 1774 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 1775 if (errmsg_len > 0) { 1776 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1777 if (errmsg_pos > 0) { 1778 if (optuio->uio_segflg == UIO_SYSSPACE) 1779 bcopy(errmsg, 1780 optuio->uio_iov[errmsg_pos].iov_base, 1781 errmsg_len); 1782 else 1783 copyout(errmsg, 1784 optuio->uio_iov[errmsg_pos].iov_base, 1785 errmsg_len); 1786 } 1787 } 1788 } 1789 done_free: 1790 #ifdef INET 1791 free(ip4, M_PRISON); 1792 #endif 1793 #ifdef INET6 1794 free(ip6, M_PRISON); 1795 #endif 1796 vfs_freeopts(opts); 1797 return (error); 1798 } 1799 1800 1801 /* 1802 * struct jail_get_args { 1803 * struct iovec *iovp; 1804 * unsigned int iovcnt; 1805 * int flags; 1806 * }; 1807 */ 1808 int 1809 jail_get(struct thread *td, struct jail_get_args *uap) 1810 { 1811 struct uio *auio; 1812 int error; 1813 1814 /* Check that we have an even number of iovecs. */ 1815 if (uap->iovcnt & 1) 1816 return (EINVAL); 1817 1818 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1819 if (error) 1820 return (error); 1821 error = kern_jail_get(td, auio, uap->flags); 1822 if (error == 0) 1823 error = copyout(auio->uio_iov, uap->iovp, 1824 uap->iovcnt * sizeof (struct iovec)); 1825 free(auio, M_IOV); 1826 return (error); 1827 } 1828 1829 int 1830 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1831 { 1832 struct prison *pr, *mypr; 1833 struct vfsopt *opt; 1834 struct vfsoptlist *opts; 1835 char *errmsg, *name; 1836 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1837 1838 if (flags & ~JAIL_GET_MASK) 1839 return (EINVAL); 1840 1841 /* Get the parameter list. */ 1842 error = vfs_buildopts(optuio, &opts); 1843 if (error) 1844 return (error); 1845 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1846 mypr = td->td_ucred->cr_prison; 1847 1848 /* 1849 * Find the prison specified by one of: lastjid, jid, name. 1850 */ 1851 sx_slock(&allprison_lock); 1852 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1853 if (error == 0) { 1854 TAILQ_FOREACH(pr, &allprison, pr_list) { 1855 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1856 mtx_lock(&pr->pr_mtx); 1857 if (pr->pr_ref > 0 && 1858 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1859 break; 1860 mtx_unlock(&pr->pr_mtx); 1861 } 1862 } 1863 if (pr != NULL) 1864 goto found_prison; 1865 error = ENOENT; 1866 vfs_opterror(opts, "no jail after %d", jid); 1867 goto done_unlock_list; 1868 } else if (error != ENOENT) 1869 goto done_unlock_list; 1870 1871 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1872 if (error == 0) { 1873 if (jid != 0) { 1874 pr = prison_find_child(mypr, jid); 1875 if (pr != NULL) { 1876 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1877 mtx_unlock(&pr->pr_mtx); 1878 error = ENOENT; 1879 vfs_opterror(opts, "jail %d is dying", 1880 jid); 1881 goto done_unlock_list; 1882 } 1883 goto found_prison; 1884 } 1885 error = ENOENT; 1886 vfs_opterror(opts, "jail %d not found", jid); 1887 goto done_unlock_list; 1888 } 1889 } else if (error != ENOENT) 1890 goto done_unlock_list; 1891 1892 error = vfs_getopt(opts, "name", (void **)&name, &len); 1893 if (error == 0) { 1894 if (len == 0 || name[len - 1] != '\0') { 1895 error = EINVAL; 1896 goto done_unlock_list; 1897 } 1898 pr = prison_find_name(mypr, name); 1899 if (pr != NULL) { 1900 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1901 mtx_unlock(&pr->pr_mtx); 1902 error = ENOENT; 1903 vfs_opterror(opts, "jail \"%s\" is dying", 1904 name); 1905 goto done_unlock_list; 1906 } 1907 goto found_prison; 1908 } 1909 error = ENOENT; 1910 vfs_opterror(opts, "jail \"%s\" not found", name); 1911 goto done_unlock_list; 1912 } else if (error != ENOENT) 1913 goto done_unlock_list; 1914 1915 vfs_opterror(opts, "no jail specified"); 1916 error = ENOENT; 1917 goto done_unlock_list; 1918 1919 found_prison: 1920 /* Get the parameters of the prison. */ 1921 pr->pr_ref++; 1922 locked = PD_LOCKED; 1923 td->td_retval[0] = pr->pr_id; 1924 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 1925 if (error != 0 && error != ENOENT) 1926 goto done_deref; 1927 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 1928 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 1929 if (error != 0 && error != ENOENT) 1930 goto done_deref; 1931 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 1932 if (error != 0 && error != ENOENT) 1933 goto done_deref; 1934 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 1935 sizeof(pr->pr_cpuset->cs_id)); 1936 if (error != 0 && error != ENOENT) 1937 goto done_deref; 1938 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 1939 if (error != 0 && error != ENOENT) 1940 goto done_deref; 1941 #ifdef INET 1942 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 1943 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1944 if (error != 0 && error != ENOENT) 1945 goto done_deref; 1946 #endif 1947 #ifdef INET6 1948 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 1949 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1950 if (error != 0 && error != ENOENT) 1951 goto done_deref; 1952 #endif 1953 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 1954 sizeof(pr->pr_securelevel)); 1955 if (error != 0 && error != ENOENT) 1956 goto done_deref; 1957 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 1958 sizeof(pr->pr_childcount)); 1959 if (error != 0 && error != ENOENT) 1960 goto done_deref; 1961 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 1962 sizeof(pr->pr_childmax)); 1963 if (error != 0 && error != ENOENT) 1964 goto done_deref; 1965 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 1966 if (error != 0 && error != ENOENT) 1967 goto done_deref; 1968 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 1969 if (error != 0 && error != ENOENT) 1970 goto done_deref; 1971 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 1972 if (error != 0 && error != ENOENT) 1973 goto done_deref; 1974 #ifdef COMPAT_FREEBSD32 1975 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 1976 uint32_t hid32 = pr->pr_hostid; 1977 1978 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 1979 } else 1980 #endif 1981 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 1982 sizeof(pr->pr_hostid)); 1983 if (error != 0 && error != ENOENT) 1984 goto done_deref; 1985 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 1986 sizeof(pr->pr_enforce_statfs)); 1987 if (error != 0 && error != ENOENT) 1988 goto done_deref; 1989 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 1990 fi++) { 1991 if (pr_flag_names[fi] == NULL) 1992 continue; 1993 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 1994 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 1995 if (error != 0 && error != ENOENT) 1996 goto done_deref; 1997 i = !i; 1998 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 1999 if (error != 0 && error != ENOENT) 2000 goto done_deref; 2001 } 2002 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 2003 fi++) { 2004 i = pr->pr_flags & 2005 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 2006 i = pr_flag_jailsys[fi].disable && 2007 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 2008 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 2009 : JAIL_SYS_INHERIT; 2010 error = 2011 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2012 if (error != 0 && error != ENOENT) 2013 goto done_deref; 2014 } 2015 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 2016 fi++) { 2017 if (pr_allow_names[fi] == NULL) 2018 continue; 2019 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2020 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2021 if (error != 0 && error != ENOENT) 2022 goto done_deref; 2023 i = !i; 2024 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2025 if (error != 0 && error != ENOENT) 2026 goto done_deref; 2027 } 2028 i = (pr->pr_uref == 0); 2029 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2030 if (error != 0 && error != ENOENT) 2031 goto done_deref; 2032 i = !i; 2033 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2034 if (error != 0 && error != ENOENT) 2035 goto done_deref; 2036 2037 /* Get the module parameters. */ 2038 mtx_unlock(&pr->pr_mtx); 2039 locked = 0; 2040 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2041 if (error) 2042 goto done_deref; 2043 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2044 2045 /* By now, all parameters should have been noted. */ 2046 TAILQ_FOREACH(opt, opts, link) { 2047 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2048 error = EINVAL; 2049 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2050 goto done_errmsg; 2051 } 2052 } 2053 2054 /* Write the fetched parameters back to userspace. */ 2055 error = 0; 2056 TAILQ_FOREACH(opt, opts, link) { 2057 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2058 pos = 2 * opt->pos + 1; 2059 optuio->uio_iov[pos].iov_len = opt->len; 2060 if (opt->value != NULL) { 2061 if (optuio->uio_segflg == UIO_SYSSPACE) { 2062 bcopy(opt->value, 2063 optuio->uio_iov[pos].iov_base, 2064 opt->len); 2065 } else { 2066 error = copyout(opt->value, 2067 optuio->uio_iov[pos].iov_base, 2068 opt->len); 2069 if (error) 2070 break; 2071 } 2072 } 2073 } 2074 } 2075 goto done_errmsg; 2076 2077 done_deref: 2078 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2079 goto done_errmsg; 2080 2081 done_unlock_list: 2082 sx_sunlock(&allprison_lock); 2083 done_errmsg: 2084 if (error && errmsg_pos >= 0) { 2085 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2086 errmsg_pos = 2 * errmsg_pos + 1; 2087 if (errmsg_len > 0) { 2088 if (optuio->uio_segflg == UIO_SYSSPACE) 2089 bcopy(errmsg, 2090 optuio->uio_iov[errmsg_pos].iov_base, 2091 errmsg_len); 2092 else 2093 copyout(errmsg, 2094 optuio->uio_iov[errmsg_pos].iov_base, 2095 errmsg_len); 2096 } 2097 } 2098 vfs_freeopts(opts); 2099 return (error); 2100 } 2101 2102 2103 /* 2104 * struct jail_remove_args { 2105 * int jid; 2106 * }; 2107 */ 2108 int 2109 jail_remove(struct thread *td, struct jail_remove_args *uap) 2110 { 2111 struct prison *pr, *cpr, *lpr, *tpr; 2112 int descend, error; 2113 2114 error = priv_check(td, PRIV_JAIL_REMOVE); 2115 if (error) 2116 return (error); 2117 2118 sx_xlock(&allprison_lock); 2119 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2120 if (pr == NULL) { 2121 sx_xunlock(&allprison_lock); 2122 return (EINVAL); 2123 } 2124 2125 /* Remove all descendants of this prison, then remove this prison. */ 2126 pr->pr_ref++; 2127 pr->pr_flags |= PR_REMOVE; 2128 if (!LIST_EMPTY(&pr->pr_children)) { 2129 mtx_unlock(&pr->pr_mtx); 2130 lpr = NULL; 2131 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2132 mtx_lock(&cpr->pr_mtx); 2133 if (cpr->pr_ref > 0) { 2134 tpr = cpr; 2135 cpr->pr_ref++; 2136 cpr->pr_flags |= PR_REMOVE; 2137 } else { 2138 /* Already removed - do not do it again. */ 2139 tpr = NULL; 2140 } 2141 mtx_unlock(&cpr->pr_mtx); 2142 if (lpr != NULL) { 2143 mtx_lock(&lpr->pr_mtx); 2144 prison_remove_one(lpr); 2145 sx_xlock(&allprison_lock); 2146 } 2147 lpr = tpr; 2148 } 2149 if (lpr != NULL) { 2150 mtx_lock(&lpr->pr_mtx); 2151 prison_remove_one(lpr); 2152 sx_xlock(&allprison_lock); 2153 } 2154 mtx_lock(&pr->pr_mtx); 2155 } 2156 prison_remove_one(pr); 2157 return (0); 2158 } 2159 2160 static void 2161 prison_remove_one(struct prison *pr) 2162 { 2163 struct proc *p; 2164 int deuref; 2165 2166 /* If the prison was persistent, it is not anymore. */ 2167 deuref = 0; 2168 if (pr->pr_flags & PR_PERSIST) { 2169 pr->pr_ref--; 2170 deuref = PD_DEUREF; 2171 pr->pr_flags &= ~PR_PERSIST; 2172 } 2173 2174 /* 2175 * jail_remove added a reference. If that's the only one, remove 2176 * the prison now. 2177 */ 2178 KASSERT(pr->pr_ref > 0, 2179 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2180 if (pr->pr_ref == 1) { 2181 prison_deref(pr, 2182 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2183 return; 2184 } 2185 2186 mtx_unlock(&pr->pr_mtx); 2187 sx_xunlock(&allprison_lock); 2188 /* 2189 * Kill all processes unfortunate enough to be attached to this prison. 2190 */ 2191 sx_slock(&allproc_lock); 2192 LIST_FOREACH(p, &allproc, p_list) { 2193 PROC_LOCK(p); 2194 if (p->p_state != PRS_NEW && p->p_ucred && 2195 p->p_ucred->cr_prison == pr) 2196 psignal(p, SIGKILL); 2197 PROC_UNLOCK(p); 2198 } 2199 sx_sunlock(&allproc_lock); 2200 /* Remove the temporary reference added by jail_remove. */ 2201 prison_deref(pr, deuref | PD_DEREF); 2202 } 2203 2204 2205 /* 2206 * struct jail_attach_args { 2207 * int jid; 2208 * }; 2209 */ 2210 int 2211 jail_attach(struct thread *td, struct jail_attach_args *uap) 2212 { 2213 struct prison *pr; 2214 int error; 2215 2216 error = priv_check(td, PRIV_JAIL_ATTACH); 2217 if (error) 2218 return (error); 2219 2220 sx_slock(&allprison_lock); 2221 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2222 if (pr == NULL) { 2223 sx_sunlock(&allprison_lock); 2224 return (EINVAL); 2225 } 2226 2227 /* 2228 * Do not allow a process to attach to a prison that is not 2229 * considered to be "alive". 2230 */ 2231 if (pr->pr_uref == 0) { 2232 mtx_unlock(&pr->pr_mtx); 2233 sx_sunlock(&allprison_lock); 2234 return (EINVAL); 2235 } 2236 2237 return (do_jail_attach(td, pr)); 2238 } 2239 2240 static int 2241 do_jail_attach(struct thread *td, struct prison *pr) 2242 { 2243 struct prison *ppr; 2244 struct proc *p; 2245 struct ucred *newcred, *oldcred; 2246 int vfslocked, error; 2247 2248 /* 2249 * XXX: Note that there is a slight race here if two threads 2250 * in the same privileged process attempt to attach to two 2251 * different jails at the same time. It is important for 2252 * user processes not to do this, or they might end up with 2253 * a process root from one prison, but attached to the jail 2254 * of another. 2255 */ 2256 pr->pr_ref++; 2257 pr->pr_uref++; 2258 mtx_unlock(&pr->pr_mtx); 2259 2260 /* Let modules do whatever they need to prepare for attaching. */ 2261 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2262 if (error) { 2263 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2264 return (error); 2265 } 2266 sx_sunlock(&allprison_lock); 2267 2268 /* 2269 * Reparent the newly attached process to this jail. 2270 */ 2271 ppr = td->td_ucred->cr_prison; 2272 p = td->td_proc; 2273 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2274 if (error) 2275 goto e_revert_osd; 2276 2277 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount); 2278 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2279 if ((error = change_dir(pr->pr_root, td)) != 0) 2280 goto e_unlock; 2281 #ifdef MAC 2282 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2283 goto e_unlock; 2284 #endif 2285 VOP_UNLOCK(pr->pr_root, 0); 2286 if ((error = change_root(pr->pr_root, td))) 2287 goto e_unlock_giant; 2288 VFS_UNLOCK_GIANT(vfslocked); 2289 2290 newcred = crget(); 2291 PROC_LOCK(p); 2292 oldcred = p->p_ucred; 2293 setsugid(p); 2294 crcopy(newcred, oldcred); 2295 newcred->cr_prison = pr; 2296 p->p_ucred = newcred; 2297 PROC_UNLOCK(p); 2298 crfree(oldcred); 2299 prison_deref(ppr, PD_DEREF | PD_DEUREF); 2300 return (0); 2301 e_unlock: 2302 VOP_UNLOCK(pr->pr_root, 0); 2303 e_unlock_giant: 2304 VFS_UNLOCK_GIANT(vfslocked); 2305 e_revert_osd: 2306 /* Tell modules this thread is still in its old jail after all. */ 2307 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td); 2308 prison_deref(pr, PD_DEREF | PD_DEUREF); 2309 return (error); 2310 } 2311 2312 2313 /* 2314 * Returns a locked prison instance, or NULL on failure. 2315 */ 2316 struct prison * 2317 prison_find(int prid) 2318 { 2319 struct prison *pr; 2320 2321 sx_assert(&allprison_lock, SX_LOCKED); 2322 TAILQ_FOREACH(pr, &allprison, pr_list) { 2323 if (pr->pr_id == prid) { 2324 mtx_lock(&pr->pr_mtx); 2325 if (pr->pr_ref > 0) 2326 return (pr); 2327 mtx_unlock(&pr->pr_mtx); 2328 } 2329 } 2330 return (NULL); 2331 } 2332 2333 /* 2334 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2335 */ 2336 struct prison * 2337 prison_find_child(struct prison *mypr, int prid) 2338 { 2339 struct prison *pr; 2340 int descend; 2341 2342 sx_assert(&allprison_lock, SX_LOCKED); 2343 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2344 if (pr->pr_id == prid) { 2345 mtx_lock(&pr->pr_mtx); 2346 if (pr->pr_ref > 0) 2347 return (pr); 2348 mtx_unlock(&pr->pr_mtx); 2349 } 2350 } 2351 return (NULL); 2352 } 2353 2354 /* 2355 * Look for the name relative to mypr. Returns a locked prison or NULL. 2356 */ 2357 struct prison * 2358 prison_find_name(struct prison *mypr, const char *name) 2359 { 2360 struct prison *pr, *deadpr; 2361 size_t mylen; 2362 int descend; 2363 2364 sx_assert(&allprison_lock, SX_LOCKED); 2365 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2366 again: 2367 deadpr = NULL; 2368 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2369 if (!strcmp(pr->pr_name + mylen, name)) { 2370 mtx_lock(&pr->pr_mtx); 2371 if (pr->pr_ref > 0) { 2372 if (pr->pr_uref > 0) 2373 return (pr); 2374 deadpr = pr; 2375 } 2376 mtx_unlock(&pr->pr_mtx); 2377 } 2378 } 2379 /* There was no valid prison - perhaps there was a dying one. */ 2380 if (deadpr != NULL) { 2381 mtx_lock(&deadpr->pr_mtx); 2382 if (deadpr->pr_ref == 0) { 2383 mtx_unlock(&deadpr->pr_mtx); 2384 goto again; 2385 } 2386 } 2387 return (deadpr); 2388 } 2389 2390 /* 2391 * See if a prison has the specific flag set. 2392 */ 2393 int 2394 prison_flag(struct ucred *cred, unsigned flag) 2395 { 2396 2397 /* This is an atomic read, so no locking is necessary. */ 2398 return (cred->cr_prison->pr_flags & flag); 2399 } 2400 2401 int 2402 prison_allow(struct ucred *cred, unsigned flag) 2403 { 2404 2405 /* This is an atomic read, so no locking is necessary. */ 2406 return (cred->cr_prison->pr_allow & flag); 2407 } 2408 2409 /* 2410 * Remove a prison reference. If that was the last reference, remove the 2411 * prison itself - but not in this context in case there are locks held. 2412 */ 2413 void 2414 prison_free_locked(struct prison *pr) 2415 { 2416 2417 mtx_assert(&pr->pr_mtx, MA_OWNED); 2418 pr->pr_ref--; 2419 if (pr->pr_ref == 0) { 2420 mtx_unlock(&pr->pr_mtx); 2421 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 2422 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2423 return; 2424 } 2425 mtx_unlock(&pr->pr_mtx); 2426 } 2427 2428 void 2429 prison_free(struct prison *pr) 2430 { 2431 2432 mtx_lock(&pr->pr_mtx); 2433 prison_free_locked(pr); 2434 } 2435 2436 static void 2437 prison_complete(void *context, int pending) 2438 { 2439 2440 prison_deref((struct prison *)context, 0); 2441 } 2442 2443 /* 2444 * Remove a prison reference (usually). This internal version assumes no 2445 * mutexes are held, except perhaps the prison itself. If there are no more 2446 * references, release and delist the prison. On completion, the prison lock 2447 * and the allprison lock are both unlocked. 2448 */ 2449 static void 2450 prison_deref(struct prison *pr, int flags) 2451 { 2452 struct prison *ppr, *tpr; 2453 int vfslocked; 2454 2455 if (!(flags & PD_LOCKED)) 2456 mtx_lock(&pr->pr_mtx); 2457 /* Decrement the user references in a separate loop. */ 2458 if (flags & PD_DEUREF) { 2459 for (tpr = pr;; tpr = tpr->pr_parent) { 2460 if (tpr != pr) 2461 mtx_lock(&tpr->pr_mtx); 2462 if (--tpr->pr_uref > 0) 2463 break; 2464 KASSERT(tpr != &prison0, ("prison0 pr_uref=0")); 2465 mtx_unlock(&tpr->pr_mtx); 2466 } 2467 /* Done if there were only user references to remove. */ 2468 if (!(flags & PD_DEREF)) { 2469 mtx_unlock(&tpr->pr_mtx); 2470 if (flags & PD_LIST_SLOCKED) 2471 sx_sunlock(&allprison_lock); 2472 else if (flags & PD_LIST_XLOCKED) 2473 sx_xunlock(&allprison_lock); 2474 return; 2475 } 2476 if (tpr != pr) { 2477 mtx_unlock(&tpr->pr_mtx); 2478 mtx_lock(&pr->pr_mtx); 2479 } 2480 } 2481 2482 for (;;) { 2483 if (flags & PD_DEREF) 2484 pr->pr_ref--; 2485 /* If the prison still has references, nothing else to do. */ 2486 if (pr->pr_ref > 0) { 2487 mtx_unlock(&pr->pr_mtx); 2488 if (flags & PD_LIST_SLOCKED) 2489 sx_sunlock(&allprison_lock); 2490 else if (flags & PD_LIST_XLOCKED) 2491 sx_xunlock(&allprison_lock); 2492 return; 2493 } 2494 2495 mtx_unlock(&pr->pr_mtx); 2496 if (flags & PD_LIST_SLOCKED) { 2497 if (!sx_try_upgrade(&allprison_lock)) { 2498 sx_sunlock(&allprison_lock); 2499 sx_xlock(&allprison_lock); 2500 } 2501 } else if (!(flags & PD_LIST_XLOCKED)) 2502 sx_xlock(&allprison_lock); 2503 2504 TAILQ_REMOVE(&allprison, pr, pr_list); 2505 LIST_REMOVE(pr, pr_sibling); 2506 ppr = pr->pr_parent; 2507 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2508 tpr->pr_childcount--; 2509 sx_xunlock(&allprison_lock); 2510 2511 #ifdef VIMAGE 2512 if (pr->pr_vnet != ppr->pr_vnet) 2513 vnet_destroy(pr->pr_vnet); 2514 #endif 2515 if (pr->pr_root != NULL) { 2516 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount); 2517 vrele(pr->pr_root); 2518 VFS_UNLOCK_GIANT(vfslocked); 2519 } 2520 mtx_destroy(&pr->pr_mtx); 2521 #ifdef INET 2522 free(pr->pr_ip4, M_PRISON); 2523 #endif 2524 #ifdef INET6 2525 free(pr->pr_ip6, M_PRISON); 2526 #endif 2527 if (pr->pr_cpuset != NULL) 2528 cpuset_rel(pr->pr_cpuset); 2529 osd_jail_exit(pr); 2530 free(pr, M_PRISON); 2531 2532 /* Removing a prison frees a reference on its parent. */ 2533 pr = ppr; 2534 mtx_lock(&pr->pr_mtx); 2535 flags = PD_DEREF; 2536 } 2537 } 2538 2539 void 2540 prison_hold_locked(struct prison *pr) 2541 { 2542 2543 mtx_assert(&pr->pr_mtx, MA_OWNED); 2544 KASSERT(pr->pr_ref > 0, 2545 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2546 pr->pr_ref++; 2547 } 2548 2549 void 2550 prison_hold(struct prison *pr) 2551 { 2552 2553 mtx_lock(&pr->pr_mtx); 2554 prison_hold_locked(pr); 2555 mtx_unlock(&pr->pr_mtx); 2556 } 2557 2558 void 2559 prison_proc_hold(struct prison *pr) 2560 { 2561 2562 mtx_lock(&pr->pr_mtx); 2563 KASSERT(pr->pr_uref > 0, 2564 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2565 pr->pr_uref++; 2566 mtx_unlock(&pr->pr_mtx); 2567 } 2568 2569 void 2570 prison_proc_free(struct prison *pr) 2571 { 2572 2573 mtx_lock(&pr->pr_mtx); 2574 KASSERT(pr->pr_uref > 0, 2575 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2576 prison_deref(pr, PD_DEUREF | PD_LOCKED); 2577 } 2578 2579 2580 #ifdef INET 2581 /* 2582 * Restrict a prison's IP address list with its parent's, possibly replacing 2583 * it. Return true if the replacement buffer was used (or would have been). 2584 */ 2585 static int 2586 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2587 { 2588 int ii, ij, used; 2589 struct prison *ppr; 2590 2591 ppr = pr->pr_parent; 2592 if (!(pr->pr_flags & PR_IP4_USER)) { 2593 /* This has no user settings, so just copy the parent's list. */ 2594 if (pr->pr_ip4s < ppr->pr_ip4s) { 2595 /* 2596 * There's no room for the parent's list. Use the 2597 * new list buffer, which is assumed to be big enough 2598 * (if it was passed). If there's no buffer, try to 2599 * allocate one. 2600 */ 2601 used = 1; 2602 if (newip4 == NULL) { 2603 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2604 M_PRISON, M_NOWAIT); 2605 if (newip4 != NULL) 2606 used = 0; 2607 } 2608 if (newip4 != NULL) { 2609 bcopy(ppr->pr_ip4, newip4, 2610 ppr->pr_ip4s * sizeof(*newip4)); 2611 free(pr->pr_ip4, M_PRISON); 2612 pr->pr_ip4 = newip4; 2613 pr->pr_ip4s = ppr->pr_ip4s; 2614 } 2615 return (used); 2616 } 2617 pr->pr_ip4s = ppr->pr_ip4s; 2618 if (pr->pr_ip4s > 0) 2619 bcopy(ppr->pr_ip4, pr->pr_ip4, 2620 pr->pr_ip4s * sizeof(*newip4)); 2621 else if (pr->pr_ip4 != NULL) { 2622 free(pr->pr_ip4, M_PRISON); 2623 pr->pr_ip4 = NULL; 2624 } 2625 } else if (pr->pr_ip4s > 0) { 2626 /* Remove addresses that aren't in the parent. */ 2627 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2628 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2629 break; 2630 if (ij < ppr->pr_ip4s) 2631 ii = 1; 2632 else { 2633 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2634 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2635 ii = 0; 2636 } 2637 for (ij = 1; ii < pr->pr_ip4s; ) { 2638 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2639 ii++; 2640 continue; 2641 } 2642 switch (ij >= ppr->pr_ip4s ? -1 : 2643 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2644 case -1: 2645 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2646 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2647 break; 2648 case 0: 2649 ii++; 2650 ij++; 2651 break; 2652 case 1: 2653 ij++; 2654 break; 2655 } 2656 } 2657 if (pr->pr_ip4s == 0) { 2658 pr->pr_flags |= PR_IP4_DISABLE; 2659 free(pr->pr_ip4, M_PRISON); 2660 pr->pr_ip4 = NULL; 2661 } 2662 } 2663 return (0); 2664 } 2665 2666 /* 2667 * Pass back primary IPv4 address of this jail. 2668 * 2669 * If not restricted return success but do not alter the address. Caller has 2670 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2671 * 2672 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2673 * Address returned in NBO. 2674 */ 2675 int 2676 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2677 { 2678 struct prison *pr; 2679 2680 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2681 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2682 2683 pr = cred->cr_prison; 2684 if (!(pr->pr_flags & PR_IP4)) 2685 return (0); 2686 mtx_lock(&pr->pr_mtx); 2687 if (!(pr->pr_flags & PR_IP4)) { 2688 mtx_unlock(&pr->pr_mtx); 2689 return (0); 2690 } 2691 if (pr->pr_ip4 == NULL) { 2692 mtx_unlock(&pr->pr_mtx); 2693 return (EAFNOSUPPORT); 2694 } 2695 2696 ia->s_addr = pr->pr_ip4[0].s_addr; 2697 mtx_unlock(&pr->pr_mtx); 2698 return (0); 2699 } 2700 2701 /* 2702 * Return 1 if we should do proper source address selection or are not jailed. 2703 * We will return 0 if we should bypass source address selection in favour 2704 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2705 * returned in NBO. 2706 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2707 */ 2708 int 2709 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2710 { 2711 struct prison *pr; 2712 struct in_addr lia; 2713 int error; 2714 2715 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2716 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2717 2718 if (!jailed(cred)) 2719 return (1); 2720 2721 pr = cred->cr_prison; 2722 if (pr->pr_flags & PR_IP4_SADDRSEL) 2723 return (1); 2724 2725 lia.s_addr = INADDR_ANY; 2726 error = prison_get_ip4(cred, &lia); 2727 if (error) 2728 return (error); 2729 if (lia.s_addr == INADDR_ANY) 2730 return (1); 2731 2732 ia->s_addr = lia.s_addr; 2733 return (0); 2734 } 2735 2736 /* 2737 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2738 */ 2739 int 2740 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2741 { 2742 2743 if (pr1 == pr2) 2744 return (1); 2745 2746 /* 2747 * No need to lock since the PR_IP4_USER flag can't be altered for 2748 * existing prisons. 2749 */ 2750 while (pr1 != &prison0 && 2751 #ifdef VIMAGE 2752 !(pr1->pr_flags & PR_VNET) && 2753 #endif 2754 !(pr1->pr_flags & PR_IP4_USER)) 2755 pr1 = pr1->pr_parent; 2756 while (pr2 != &prison0 && 2757 #ifdef VIMAGE 2758 !(pr2->pr_flags & PR_VNET) && 2759 #endif 2760 !(pr2->pr_flags & PR_IP4_USER)) 2761 pr2 = pr2->pr_parent; 2762 return (pr1 == pr2); 2763 } 2764 2765 /* 2766 * Make sure our (source) address is set to something meaningful to this 2767 * jail. 2768 * 2769 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2770 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2771 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2772 */ 2773 int 2774 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2775 { 2776 struct prison *pr; 2777 struct in_addr ia0; 2778 int error; 2779 2780 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2781 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2782 2783 pr = cred->cr_prison; 2784 if (!(pr->pr_flags & PR_IP4)) 2785 return (0); 2786 mtx_lock(&pr->pr_mtx); 2787 if (!(pr->pr_flags & PR_IP4)) { 2788 mtx_unlock(&pr->pr_mtx); 2789 return (0); 2790 } 2791 if (pr->pr_ip4 == NULL) { 2792 mtx_unlock(&pr->pr_mtx); 2793 return (EAFNOSUPPORT); 2794 } 2795 2796 ia0.s_addr = ntohl(ia->s_addr); 2797 if (ia0.s_addr == INADDR_LOOPBACK) { 2798 ia->s_addr = pr->pr_ip4[0].s_addr; 2799 mtx_unlock(&pr->pr_mtx); 2800 return (0); 2801 } 2802 2803 if (ia0.s_addr == INADDR_ANY) { 2804 /* 2805 * In case there is only 1 IPv4 address, bind directly. 2806 */ 2807 if (pr->pr_ip4s == 1) 2808 ia->s_addr = pr->pr_ip4[0].s_addr; 2809 mtx_unlock(&pr->pr_mtx); 2810 return (0); 2811 } 2812 2813 error = _prison_check_ip4(pr, ia); 2814 mtx_unlock(&pr->pr_mtx); 2815 return (error); 2816 } 2817 2818 /* 2819 * Rewrite destination address in case we will connect to loopback address. 2820 * 2821 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2822 * Address passed in in NBO and returned in NBO. 2823 */ 2824 int 2825 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 2826 { 2827 struct prison *pr; 2828 2829 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2830 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2831 2832 pr = cred->cr_prison; 2833 if (!(pr->pr_flags & PR_IP4)) 2834 return (0); 2835 mtx_lock(&pr->pr_mtx); 2836 if (!(pr->pr_flags & PR_IP4)) { 2837 mtx_unlock(&pr->pr_mtx); 2838 return (0); 2839 } 2840 if (pr->pr_ip4 == NULL) { 2841 mtx_unlock(&pr->pr_mtx); 2842 return (EAFNOSUPPORT); 2843 } 2844 2845 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 2846 ia->s_addr = pr->pr_ip4[0].s_addr; 2847 mtx_unlock(&pr->pr_mtx); 2848 return (0); 2849 } 2850 2851 /* 2852 * Return success because nothing had to be changed. 2853 */ 2854 mtx_unlock(&pr->pr_mtx); 2855 return (0); 2856 } 2857 2858 /* 2859 * Check if given address belongs to the jail referenced by cred/prison. 2860 * 2861 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2862 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2863 * doesn't allow IPv4. Address passed in in NBO. 2864 */ 2865 static int 2866 _prison_check_ip4(struct prison *pr, struct in_addr *ia) 2867 { 2868 int i, a, z, d; 2869 2870 /* 2871 * Check the primary IP. 2872 */ 2873 if (pr->pr_ip4[0].s_addr == ia->s_addr) 2874 return (0); 2875 2876 /* 2877 * All the other IPs are sorted so we can do a binary search. 2878 */ 2879 a = 0; 2880 z = pr->pr_ip4s - 2; 2881 while (a <= z) { 2882 i = (a + z) / 2; 2883 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 2884 if (d > 0) 2885 z = i - 1; 2886 else if (d < 0) 2887 a = i + 1; 2888 else 2889 return (0); 2890 } 2891 2892 return (EADDRNOTAVAIL); 2893 } 2894 2895 int 2896 prison_check_ip4(struct ucred *cred, struct in_addr *ia) 2897 { 2898 struct prison *pr; 2899 int error; 2900 2901 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2902 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2903 2904 pr = cred->cr_prison; 2905 if (!(pr->pr_flags & PR_IP4)) 2906 return (0); 2907 mtx_lock(&pr->pr_mtx); 2908 if (!(pr->pr_flags & PR_IP4)) { 2909 mtx_unlock(&pr->pr_mtx); 2910 return (0); 2911 } 2912 if (pr->pr_ip4 == NULL) { 2913 mtx_unlock(&pr->pr_mtx); 2914 return (EAFNOSUPPORT); 2915 } 2916 2917 error = _prison_check_ip4(pr, ia); 2918 mtx_unlock(&pr->pr_mtx); 2919 return (error); 2920 } 2921 #endif 2922 2923 #ifdef INET6 2924 static int 2925 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 2926 { 2927 int ii, ij, used; 2928 struct prison *ppr; 2929 2930 ppr = pr->pr_parent; 2931 if (!(pr->pr_flags & PR_IP6_USER)) { 2932 /* This has no user settings, so just copy the parent's list. */ 2933 if (pr->pr_ip6s < ppr->pr_ip6s) { 2934 /* 2935 * There's no room for the parent's list. Use the 2936 * new list buffer, which is assumed to be big enough 2937 * (if it was passed). If there's no buffer, try to 2938 * allocate one. 2939 */ 2940 used = 1; 2941 if (newip6 == NULL) { 2942 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 2943 M_PRISON, M_NOWAIT); 2944 if (newip6 != NULL) 2945 used = 0; 2946 } 2947 if (newip6 != NULL) { 2948 bcopy(ppr->pr_ip6, newip6, 2949 ppr->pr_ip6s * sizeof(*newip6)); 2950 free(pr->pr_ip6, M_PRISON); 2951 pr->pr_ip6 = newip6; 2952 pr->pr_ip6s = ppr->pr_ip6s; 2953 } 2954 return (used); 2955 } 2956 pr->pr_ip6s = ppr->pr_ip6s; 2957 if (pr->pr_ip6s > 0) 2958 bcopy(ppr->pr_ip6, pr->pr_ip6, 2959 pr->pr_ip6s * sizeof(*newip6)); 2960 else if (pr->pr_ip6 != NULL) { 2961 free(pr->pr_ip6, M_PRISON); 2962 pr->pr_ip6 = NULL; 2963 } 2964 } else if (pr->pr_ip6s > 0) { 2965 /* Remove addresses that aren't in the parent. */ 2966 for (ij = 0; ij < ppr->pr_ip6s; ij++) 2967 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 2968 &ppr->pr_ip6[ij])) 2969 break; 2970 if (ij < ppr->pr_ip6s) 2971 ii = 1; 2972 else { 2973 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 2974 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2975 ii = 0; 2976 } 2977 for (ij = 1; ii < pr->pr_ip6s; ) { 2978 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 2979 &ppr->pr_ip6[0])) { 2980 ii++; 2981 continue; 2982 } 2983 switch (ij >= ppr->pr_ip4s ? -1 : 2984 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 2985 case -1: 2986 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 2987 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 2988 break; 2989 case 0: 2990 ii++; 2991 ij++; 2992 break; 2993 case 1: 2994 ij++; 2995 break; 2996 } 2997 } 2998 if (pr->pr_ip6s == 0) { 2999 pr->pr_flags |= PR_IP6_DISABLE; 3000 free(pr->pr_ip6, M_PRISON); 3001 pr->pr_ip6 = NULL; 3002 } 3003 } 3004 return 0; 3005 } 3006 3007 /* 3008 * Pass back primary IPv6 address for this jail. 3009 * 3010 * If not restricted return success but do not alter the address. Caller has 3011 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3012 * 3013 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3014 */ 3015 int 3016 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3017 { 3018 struct prison *pr; 3019 3020 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3021 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3022 3023 pr = cred->cr_prison; 3024 if (!(pr->pr_flags & PR_IP6)) 3025 return (0); 3026 mtx_lock(&pr->pr_mtx); 3027 if (!(pr->pr_flags & PR_IP6)) { 3028 mtx_unlock(&pr->pr_mtx); 3029 return (0); 3030 } 3031 if (pr->pr_ip6 == NULL) { 3032 mtx_unlock(&pr->pr_mtx); 3033 return (EAFNOSUPPORT); 3034 } 3035 3036 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3037 mtx_unlock(&pr->pr_mtx); 3038 return (0); 3039 } 3040 3041 /* 3042 * Return 1 if we should do proper source address selection or are not jailed. 3043 * We will return 0 if we should bypass source address selection in favour 3044 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3045 * returned in NBO. 3046 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3047 */ 3048 int 3049 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3050 { 3051 struct prison *pr; 3052 struct in6_addr lia6; 3053 int error; 3054 3055 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3056 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3057 3058 if (!jailed(cred)) 3059 return (1); 3060 3061 pr = cred->cr_prison; 3062 if (pr->pr_flags & PR_IP6_SADDRSEL) 3063 return (1); 3064 3065 lia6 = in6addr_any; 3066 error = prison_get_ip6(cred, &lia6); 3067 if (error) 3068 return (error); 3069 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3070 return (1); 3071 3072 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3073 return (0); 3074 } 3075 3076 /* 3077 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3078 */ 3079 int 3080 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3081 { 3082 3083 if (pr1 == pr2) 3084 return (1); 3085 3086 while (pr1 != &prison0 && 3087 #ifdef VIMAGE 3088 !(pr1->pr_flags & PR_VNET) && 3089 #endif 3090 !(pr1->pr_flags & PR_IP6_USER)) 3091 pr1 = pr1->pr_parent; 3092 while (pr2 != &prison0 && 3093 #ifdef VIMAGE 3094 !(pr2->pr_flags & PR_VNET) && 3095 #endif 3096 !(pr2->pr_flags & PR_IP6_USER)) 3097 pr2 = pr2->pr_parent; 3098 return (pr1 == pr2); 3099 } 3100 3101 /* 3102 * Make sure our (source) address is set to something meaningful to this jail. 3103 * 3104 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3105 * when needed while binding. 3106 * 3107 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3108 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3109 * doesn't allow IPv6. 3110 */ 3111 int 3112 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3113 { 3114 struct prison *pr; 3115 int error; 3116 3117 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3118 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3119 3120 pr = cred->cr_prison; 3121 if (!(pr->pr_flags & PR_IP6)) 3122 return (0); 3123 mtx_lock(&pr->pr_mtx); 3124 if (!(pr->pr_flags & PR_IP6)) { 3125 mtx_unlock(&pr->pr_mtx); 3126 return (0); 3127 } 3128 if (pr->pr_ip6 == NULL) { 3129 mtx_unlock(&pr->pr_mtx); 3130 return (EAFNOSUPPORT); 3131 } 3132 3133 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3134 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3135 mtx_unlock(&pr->pr_mtx); 3136 return (0); 3137 } 3138 3139 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3140 /* 3141 * In case there is only 1 IPv6 address, and v6only is true, 3142 * then bind directly. 3143 */ 3144 if (v6only != 0 && pr->pr_ip6s == 1) 3145 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3146 mtx_unlock(&pr->pr_mtx); 3147 return (0); 3148 } 3149 3150 error = _prison_check_ip6(pr, ia6); 3151 mtx_unlock(&pr->pr_mtx); 3152 return (error); 3153 } 3154 3155 /* 3156 * Rewrite destination address in case we will connect to loopback address. 3157 * 3158 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3159 */ 3160 int 3161 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3162 { 3163 struct prison *pr; 3164 3165 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3166 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3167 3168 pr = cred->cr_prison; 3169 if (!(pr->pr_flags & PR_IP6)) 3170 return (0); 3171 mtx_lock(&pr->pr_mtx); 3172 if (!(pr->pr_flags & PR_IP6)) { 3173 mtx_unlock(&pr->pr_mtx); 3174 return (0); 3175 } 3176 if (pr->pr_ip6 == NULL) { 3177 mtx_unlock(&pr->pr_mtx); 3178 return (EAFNOSUPPORT); 3179 } 3180 3181 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3182 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3183 mtx_unlock(&pr->pr_mtx); 3184 return (0); 3185 } 3186 3187 /* 3188 * Return success because nothing had to be changed. 3189 */ 3190 mtx_unlock(&pr->pr_mtx); 3191 return (0); 3192 } 3193 3194 /* 3195 * Check if given address belongs to the jail referenced by cred/prison. 3196 * 3197 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3198 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3199 * doesn't allow IPv6. 3200 */ 3201 static int 3202 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3203 { 3204 int i, a, z, d; 3205 3206 /* 3207 * Check the primary IP. 3208 */ 3209 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3210 return (0); 3211 3212 /* 3213 * All the other IPs are sorted so we can do a binary search. 3214 */ 3215 a = 0; 3216 z = pr->pr_ip6s - 2; 3217 while (a <= z) { 3218 i = (a + z) / 2; 3219 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3220 if (d > 0) 3221 z = i - 1; 3222 else if (d < 0) 3223 a = i + 1; 3224 else 3225 return (0); 3226 } 3227 3228 return (EADDRNOTAVAIL); 3229 } 3230 3231 int 3232 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3233 { 3234 struct prison *pr; 3235 int error; 3236 3237 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3238 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3239 3240 pr = cred->cr_prison; 3241 if (!(pr->pr_flags & PR_IP6)) 3242 return (0); 3243 mtx_lock(&pr->pr_mtx); 3244 if (!(pr->pr_flags & PR_IP6)) { 3245 mtx_unlock(&pr->pr_mtx); 3246 return (0); 3247 } 3248 if (pr->pr_ip6 == NULL) { 3249 mtx_unlock(&pr->pr_mtx); 3250 return (EAFNOSUPPORT); 3251 } 3252 3253 error = _prison_check_ip6(pr, ia6); 3254 mtx_unlock(&pr->pr_mtx); 3255 return (error); 3256 } 3257 #endif 3258 3259 /* 3260 * Check if a jail supports the given address family. 3261 * 3262 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3263 * if not. 3264 */ 3265 int 3266 prison_check_af(struct ucred *cred, int af) 3267 { 3268 struct prison *pr; 3269 int error; 3270 3271 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3272 3273 pr = cred->cr_prison; 3274 #ifdef VIMAGE 3275 /* Prisons with their own network stack are not limited. */ 3276 if (prison_owns_vnet(cred)) 3277 return (0); 3278 #endif 3279 3280 error = 0; 3281 switch (af) 3282 { 3283 #ifdef INET 3284 case AF_INET: 3285 if (pr->pr_flags & PR_IP4) 3286 { 3287 mtx_lock(&pr->pr_mtx); 3288 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3289 error = EAFNOSUPPORT; 3290 mtx_unlock(&pr->pr_mtx); 3291 } 3292 break; 3293 #endif 3294 #ifdef INET6 3295 case AF_INET6: 3296 if (pr->pr_flags & PR_IP6) 3297 { 3298 mtx_lock(&pr->pr_mtx); 3299 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3300 error = EAFNOSUPPORT; 3301 mtx_unlock(&pr->pr_mtx); 3302 } 3303 break; 3304 #endif 3305 case AF_LOCAL: 3306 case AF_ROUTE: 3307 break; 3308 default: 3309 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3310 error = EAFNOSUPPORT; 3311 } 3312 return (error); 3313 } 3314 3315 /* 3316 * Check if given address belongs to the jail referenced by cred (wrapper to 3317 * prison_check_ip[46]). 3318 * 3319 * Returns 0 if jail doesn't restrict the address family or if address belongs 3320 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3321 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3322 */ 3323 int 3324 prison_if(struct ucred *cred, struct sockaddr *sa) 3325 { 3326 #ifdef INET 3327 struct sockaddr_in *sai; 3328 #endif 3329 #ifdef INET6 3330 struct sockaddr_in6 *sai6; 3331 #endif 3332 int error; 3333 3334 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3335 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3336 3337 #ifdef VIMAGE 3338 if (prison_owns_vnet(cred)) 3339 return (0); 3340 #endif 3341 3342 error = 0; 3343 switch (sa->sa_family) 3344 { 3345 #ifdef INET 3346 case AF_INET: 3347 sai = (struct sockaddr_in *)sa; 3348 error = prison_check_ip4(cred, &sai->sin_addr); 3349 break; 3350 #endif 3351 #ifdef INET6 3352 case AF_INET6: 3353 sai6 = (struct sockaddr_in6 *)sa; 3354 error = prison_check_ip6(cred, &sai6->sin6_addr); 3355 break; 3356 #endif 3357 default: 3358 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3359 error = EAFNOSUPPORT; 3360 } 3361 return (error); 3362 } 3363 3364 /* 3365 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3366 */ 3367 int 3368 prison_check(struct ucred *cred1, struct ucred *cred2) 3369 { 3370 3371 return ((cred1->cr_prison == cred2->cr_prison || 3372 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3373 } 3374 3375 /* 3376 * Return 1 if p2 is a child of p1, otherwise 0. 3377 */ 3378 int 3379 prison_ischild(struct prison *pr1, struct prison *pr2) 3380 { 3381 3382 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3383 if (pr1 == pr2) 3384 return (1); 3385 return (0); 3386 } 3387 3388 /* 3389 * Return 1 if the passed credential is in a jail, otherwise 0. 3390 */ 3391 int 3392 jailed(struct ucred *cred) 3393 { 3394 3395 return (cred->cr_prison != &prison0); 3396 } 3397 3398 /* 3399 * Return 1 if the passed credential is in a jail and that jail does not 3400 * have its own virtual network stack, otherwise 0. 3401 */ 3402 int 3403 jailed_without_vnet(struct ucred *cred) 3404 { 3405 3406 if (!jailed(cred)) 3407 return (0); 3408 #ifdef VIMAGE 3409 if (prison_owns_vnet(cred)) 3410 return (0); 3411 #endif 3412 3413 return (1); 3414 } 3415 3416 /* 3417 * Return the correct hostname (domainname, et al) for the passed credential. 3418 */ 3419 void 3420 getcredhostname(struct ucred *cred, char *buf, size_t size) 3421 { 3422 struct prison *pr; 3423 3424 /* 3425 * A NULL credential can be used to shortcut to the physical 3426 * system's hostname. 3427 */ 3428 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3429 mtx_lock(&pr->pr_mtx); 3430 strlcpy(buf, pr->pr_hostname, size); 3431 mtx_unlock(&pr->pr_mtx); 3432 } 3433 3434 void 3435 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3436 { 3437 3438 mtx_lock(&cred->cr_prison->pr_mtx); 3439 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3440 mtx_unlock(&cred->cr_prison->pr_mtx); 3441 } 3442 3443 void 3444 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3445 { 3446 3447 mtx_lock(&cred->cr_prison->pr_mtx); 3448 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3449 mtx_unlock(&cred->cr_prison->pr_mtx); 3450 } 3451 3452 void 3453 getcredhostid(struct ucred *cred, unsigned long *hostid) 3454 { 3455 3456 mtx_lock(&cred->cr_prison->pr_mtx); 3457 *hostid = cred->cr_prison->pr_hostid; 3458 mtx_unlock(&cred->cr_prison->pr_mtx); 3459 } 3460 3461 #ifdef VIMAGE 3462 /* 3463 * Determine whether the prison represented by cred owns 3464 * its vnet rather than having it inherited. 3465 * 3466 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3467 */ 3468 int 3469 prison_owns_vnet(struct ucred *cred) 3470 { 3471 3472 /* 3473 * vnets cannot be added/removed after jail creation, 3474 * so no need to lock here. 3475 */ 3476 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3477 } 3478 #endif 3479 3480 /* 3481 * Determine whether the subject represented by cred can "see" 3482 * status of a mount point. 3483 * Returns: 0 for permitted, ENOENT otherwise. 3484 * XXX: This function should be called cr_canseemount() and should be 3485 * placed in kern_prot.c. 3486 */ 3487 int 3488 prison_canseemount(struct ucred *cred, struct mount *mp) 3489 { 3490 struct prison *pr; 3491 struct statfs *sp; 3492 size_t len; 3493 3494 pr = cred->cr_prison; 3495 if (pr->pr_enforce_statfs == 0) 3496 return (0); 3497 if (pr->pr_root->v_mount == mp) 3498 return (0); 3499 if (pr->pr_enforce_statfs == 2) 3500 return (ENOENT); 3501 /* 3502 * If jail's chroot directory is set to "/" we should be able to see 3503 * all mount-points from inside a jail. 3504 * This is ugly check, but this is the only situation when jail's 3505 * directory ends with '/'. 3506 */ 3507 if (strcmp(pr->pr_path, "/") == 0) 3508 return (0); 3509 len = strlen(pr->pr_path); 3510 sp = &mp->mnt_stat; 3511 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3512 return (ENOENT); 3513 /* 3514 * Be sure that we don't have situation where jail's root directory 3515 * is "/some/path" and mount point is "/some/pathpath". 3516 */ 3517 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3518 return (ENOENT); 3519 return (0); 3520 } 3521 3522 void 3523 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3524 { 3525 char jpath[MAXPATHLEN]; 3526 struct prison *pr; 3527 size_t len; 3528 3529 pr = cred->cr_prison; 3530 if (pr->pr_enforce_statfs == 0) 3531 return; 3532 if (prison_canseemount(cred, mp) != 0) { 3533 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3534 strlcpy(sp->f_mntonname, "[restricted]", 3535 sizeof(sp->f_mntonname)); 3536 return; 3537 } 3538 if (pr->pr_root->v_mount == mp) { 3539 /* 3540 * Clear current buffer data, so we are sure nothing from 3541 * the valid path left there. 3542 */ 3543 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3544 *sp->f_mntonname = '/'; 3545 return; 3546 } 3547 /* 3548 * If jail's chroot directory is set to "/" we should be able to see 3549 * all mount-points from inside a jail. 3550 */ 3551 if (strcmp(pr->pr_path, "/") == 0) 3552 return; 3553 len = strlen(pr->pr_path); 3554 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3555 /* 3556 * Clear current buffer data, so we are sure nothing from 3557 * the valid path left there. 3558 */ 3559 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3560 if (*jpath == '\0') { 3561 /* Should never happen. */ 3562 *sp->f_mntonname = '/'; 3563 } else { 3564 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3565 } 3566 } 3567 3568 /* 3569 * Check with permission for a specific privilege is granted within jail. We 3570 * have a specific list of accepted privileges; the rest are denied. 3571 */ 3572 int 3573 prison_priv_check(struct ucred *cred, int priv) 3574 { 3575 3576 if (!jailed(cred)) 3577 return (0); 3578 3579 #ifdef VIMAGE 3580 /* 3581 * Privileges specific to prisons with a virtual network stack. 3582 * There might be a duplicate entry here in case the privilege 3583 * is only granted conditionally in the legacy jail case. 3584 */ 3585 switch (priv) { 3586 #ifdef notyet 3587 /* 3588 * NFS-specific privileges. 3589 */ 3590 case PRIV_NFS_DAEMON: 3591 case PRIV_NFS_LOCKD: 3592 #endif 3593 /* 3594 * Network stack privileges. 3595 */ 3596 case PRIV_NET_BRIDGE: 3597 case PRIV_NET_GRE: 3598 case PRIV_NET_BPF: 3599 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3600 case PRIV_NET_ROUTE: 3601 case PRIV_NET_TAP: 3602 case PRIV_NET_SETIFMTU: 3603 case PRIV_NET_SETIFFLAGS: 3604 case PRIV_NET_SETIFCAP: 3605 case PRIV_NET_SETIFDESCR: 3606 case PRIV_NET_SETIFNAME : 3607 case PRIV_NET_SETIFMETRIC: 3608 case PRIV_NET_SETIFPHYS: 3609 case PRIV_NET_SETIFMAC: 3610 case PRIV_NET_ADDMULTI: 3611 case PRIV_NET_DELMULTI: 3612 case PRIV_NET_HWIOCTL: 3613 case PRIV_NET_SETLLADDR: 3614 case PRIV_NET_ADDIFGROUP: 3615 case PRIV_NET_DELIFGROUP: 3616 case PRIV_NET_IFCREATE: 3617 case PRIV_NET_IFDESTROY: 3618 case PRIV_NET_ADDIFADDR: 3619 case PRIV_NET_DELIFADDR: 3620 case PRIV_NET_LAGG: 3621 case PRIV_NET_GIF: 3622 case PRIV_NET_SETIFVNET: 3623 case PRIV_NET_SETIFFIB: 3624 3625 /* 3626 * 802.11-related privileges. 3627 */ 3628 case PRIV_NET80211_GETKEY: 3629 #ifdef notyet 3630 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3631 #endif 3632 3633 #ifdef notyet 3634 /* 3635 * AppleTalk privileges. 3636 */ 3637 case PRIV_NETATALK_RESERVEDPORT: 3638 3639 /* 3640 * ATM privileges. 3641 */ 3642 case PRIV_NETATM_CFG: 3643 case PRIV_NETATM_ADD: 3644 case PRIV_NETATM_DEL: 3645 case PRIV_NETATM_SET: 3646 3647 /* 3648 * Bluetooth privileges. 3649 */ 3650 case PRIV_NETBLUETOOTH_RAW: 3651 #endif 3652 3653 /* 3654 * Netgraph and netgraph module privileges. 3655 */ 3656 case PRIV_NETGRAPH_CONTROL: 3657 #ifdef notyet 3658 case PRIV_NETGRAPH_TTY: 3659 #endif 3660 3661 /* 3662 * IPv4 and IPv6 privileges. 3663 */ 3664 case PRIV_NETINET_IPFW: 3665 case PRIV_NETINET_DIVERT: 3666 case PRIV_NETINET_PF: 3667 case PRIV_NETINET_DUMMYNET: 3668 case PRIV_NETINET_CARP: 3669 case PRIV_NETINET_MROUTE: 3670 case PRIV_NETINET_RAW: 3671 case PRIV_NETINET_ADDRCTRL6: 3672 case PRIV_NETINET_ND6: 3673 case PRIV_NETINET_SCOPE6: 3674 case PRIV_NETINET_ALIFETIME6: 3675 case PRIV_NETINET_IPSEC: 3676 case PRIV_NETINET_BINDANY: 3677 3678 #ifdef notyet 3679 /* 3680 * IPX/SPX privileges. 3681 */ 3682 case PRIV_NETIPX_RESERVEDPORT: 3683 case PRIV_NETIPX_RAW: 3684 3685 /* 3686 * NCP privileges. 3687 */ 3688 case PRIV_NETNCP: 3689 3690 /* 3691 * SMB privileges. 3692 */ 3693 case PRIV_NETSMB: 3694 #endif 3695 3696 /* 3697 * No default: or deny here. 3698 * In case of no permit fall through to next switch(). 3699 */ 3700 if (cred->cr_prison->pr_flags & PR_VNET) 3701 return (0); 3702 } 3703 #endif /* VIMAGE */ 3704 3705 switch (priv) { 3706 3707 /* 3708 * Allow ktrace privileges for root in jail. 3709 */ 3710 case PRIV_KTRACE: 3711 3712 #if 0 3713 /* 3714 * Allow jailed processes to configure audit identity and 3715 * submit audit records (login, etc). In the future we may 3716 * want to further refine the relationship between audit and 3717 * jail. 3718 */ 3719 case PRIV_AUDIT_GETAUDIT: 3720 case PRIV_AUDIT_SETAUDIT: 3721 case PRIV_AUDIT_SUBMIT: 3722 #endif 3723 3724 /* 3725 * Allow jailed processes to manipulate process UNIX 3726 * credentials in any way they see fit. 3727 */ 3728 case PRIV_CRED_SETUID: 3729 case PRIV_CRED_SETEUID: 3730 case PRIV_CRED_SETGID: 3731 case PRIV_CRED_SETEGID: 3732 case PRIV_CRED_SETGROUPS: 3733 case PRIV_CRED_SETREUID: 3734 case PRIV_CRED_SETREGID: 3735 case PRIV_CRED_SETRESUID: 3736 case PRIV_CRED_SETRESGID: 3737 3738 /* 3739 * Jail implements visibility constraints already, so allow 3740 * jailed root to override uid/gid-based constraints. 3741 */ 3742 case PRIV_SEEOTHERGIDS: 3743 case PRIV_SEEOTHERUIDS: 3744 3745 /* 3746 * Jail implements inter-process debugging limits already, so 3747 * allow jailed root various debugging privileges. 3748 */ 3749 case PRIV_DEBUG_DIFFCRED: 3750 case PRIV_DEBUG_SUGID: 3751 case PRIV_DEBUG_UNPRIV: 3752 3753 /* 3754 * Allow jail to set various resource limits and login 3755 * properties, and for now, exceed process resource limits. 3756 */ 3757 case PRIV_PROC_LIMIT: 3758 case PRIV_PROC_SETLOGIN: 3759 case PRIV_PROC_SETRLIMIT: 3760 3761 /* 3762 * System V and POSIX IPC privileges are granted in jail. 3763 */ 3764 case PRIV_IPC_READ: 3765 case PRIV_IPC_WRITE: 3766 case PRIV_IPC_ADMIN: 3767 case PRIV_IPC_MSGSIZE: 3768 case PRIV_MQ_ADMIN: 3769 3770 /* 3771 * Jail operations within a jail work on child jails. 3772 */ 3773 case PRIV_JAIL_ATTACH: 3774 case PRIV_JAIL_SET: 3775 case PRIV_JAIL_REMOVE: 3776 3777 /* 3778 * Jail implements its own inter-process limits, so allow 3779 * root processes in jail to change scheduling on other 3780 * processes in the same jail. Likewise for signalling. 3781 */ 3782 case PRIV_SCHED_DIFFCRED: 3783 case PRIV_SCHED_CPUSET: 3784 case PRIV_SIGNAL_DIFFCRED: 3785 case PRIV_SIGNAL_SUGID: 3786 3787 /* 3788 * Allow jailed processes to write to sysctls marked as jail 3789 * writable. 3790 */ 3791 case PRIV_SYSCTL_WRITEJAIL: 3792 3793 /* 3794 * Allow root in jail to manage a variety of quota 3795 * properties. These should likely be conditional on a 3796 * configuration option. 3797 */ 3798 case PRIV_VFS_GETQUOTA: 3799 case PRIV_VFS_SETQUOTA: 3800 3801 /* 3802 * Since Jail relies on chroot() to implement file system 3803 * protections, grant many VFS privileges to root in jail. 3804 * Be careful to exclude mount-related and NFS-related 3805 * privileges. 3806 */ 3807 case PRIV_VFS_READ: 3808 case PRIV_VFS_WRITE: 3809 case PRIV_VFS_ADMIN: 3810 case PRIV_VFS_EXEC: 3811 case PRIV_VFS_LOOKUP: 3812 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3813 case PRIV_VFS_CHFLAGS_DEV: 3814 case PRIV_VFS_CHOWN: 3815 case PRIV_VFS_CHROOT: 3816 case PRIV_VFS_RETAINSUGID: 3817 case PRIV_VFS_FCHROOT: 3818 case PRIV_VFS_LINK: 3819 case PRIV_VFS_SETGID: 3820 case PRIV_VFS_STAT: 3821 case PRIV_VFS_STICKYFILE: 3822 return (0); 3823 3824 /* 3825 * Depending on the global setting, allow privilege of 3826 * setting system flags. 3827 */ 3828 case PRIV_VFS_SYSFLAGS: 3829 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3830 return (0); 3831 else 3832 return (EPERM); 3833 3834 /* 3835 * Depending on the global setting, allow privilege of 3836 * mounting/unmounting file systems. 3837 */ 3838 case PRIV_VFS_MOUNT: 3839 case PRIV_VFS_UNMOUNT: 3840 case PRIV_VFS_MOUNT_NONUSER: 3841 case PRIV_VFS_MOUNT_OWNER: 3842 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT) 3843 return (0); 3844 else 3845 return (EPERM); 3846 3847 /* 3848 * Allow jailed root to bind reserved ports and reuse in-use 3849 * ports. 3850 */ 3851 case PRIV_NETINET_RESERVEDPORT: 3852 case PRIV_NETINET_REUSEPORT: 3853 return (0); 3854 3855 /* 3856 * Allow jailed root to set certian IPv4/6 (option) headers. 3857 */ 3858 case PRIV_NETINET_SETHDROPTS: 3859 return (0); 3860 3861 /* 3862 * Conditionally allow creating raw sockets in jail. 3863 */ 3864 case PRIV_NETINET_RAW: 3865 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3866 return (0); 3867 else 3868 return (EPERM); 3869 3870 /* 3871 * Since jail implements its own visibility limits on netstat 3872 * sysctls, allow getcred. This allows identd to work in 3873 * jail. 3874 */ 3875 case PRIV_NETINET_GETCRED: 3876 return (0); 3877 3878 default: 3879 /* 3880 * In all remaining cases, deny the privilege request. This 3881 * includes almost all network privileges, many system 3882 * configuration privileges. 3883 */ 3884 return (EPERM); 3885 } 3886 } 3887 3888 /* 3889 * Return the part of pr2's name that is relative to pr1, or the whole name 3890 * if it does not directly follow. 3891 */ 3892 3893 char * 3894 prison_name(struct prison *pr1, struct prison *pr2) 3895 { 3896 char *name; 3897 3898 /* Jails see themselves as "" (if they see themselves at all). */ 3899 if (pr1 == pr2) 3900 return ""; 3901 name = pr2->pr_name; 3902 if (prison_ischild(pr1, pr2)) { 3903 /* 3904 * pr1 isn't locked (and allprison_lock may not be either) 3905 * so its length can't be counted on. But the number of dots 3906 * can be counted on - and counted. 3907 */ 3908 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3909 name = strchr(name, '.') + 1; 3910 } 3911 return (name); 3912 } 3913 3914 /* 3915 * Return the part of pr2's path that is relative to pr1, or the whole path 3916 * if it does not directly follow. 3917 */ 3918 static char * 3919 prison_path(struct prison *pr1, struct prison *pr2) 3920 { 3921 char *path1, *path2; 3922 int len1; 3923 3924 path1 = pr1->pr_path; 3925 path2 = pr2->pr_path; 3926 if (!strcmp(path1, "/")) 3927 return (path2); 3928 len1 = strlen(path1); 3929 if (strncmp(path1, path2, len1)) 3930 return (path2); 3931 if (path2[len1] == '\0') 3932 return "/"; 3933 if (path2[len1] == '/') 3934 return (path2 + len1); 3935 return (path2); 3936 } 3937 3938 3939 /* 3940 * Jail-related sysctls. 3941 */ 3942 SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 3943 "Jails"); 3944 3945 static int 3946 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 3947 { 3948 struct xprison *xp; 3949 struct prison *pr, *cpr; 3950 #ifdef INET 3951 struct in_addr *ip4 = NULL; 3952 int ip4s = 0; 3953 #endif 3954 #ifdef INET6 3955 struct in_addr *ip6 = NULL; 3956 int ip6s = 0; 3957 #endif 3958 int descend, error; 3959 3960 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 3961 pr = req->td->td_ucred->cr_prison; 3962 error = 0; 3963 sx_slock(&allprison_lock); 3964 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 3965 #if defined(INET) || defined(INET6) 3966 again: 3967 #endif 3968 mtx_lock(&cpr->pr_mtx); 3969 #ifdef INET 3970 if (cpr->pr_ip4s > 0) { 3971 if (ip4s < cpr->pr_ip4s) { 3972 ip4s = cpr->pr_ip4s; 3973 mtx_unlock(&cpr->pr_mtx); 3974 ip4 = realloc(ip4, ip4s * 3975 sizeof(struct in_addr), M_TEMP, M_WAITOK); 3976 goto again; 3977 } 3978 bcopy(cpr->pr_ip4, ip4, 3979 cpr->pr_ip4s * sizeof(struct in_addr)); 3980 } 3981 #endif 3982 #ifdef INET6 3983 if (cpr->pr_ip6s > 0) { 3984 if (ip6s < cpr->pr_ip6s) { 3985 ip6s = cpr->pr_ip6s; 3986 mtx_unlock(&cpr->pr_mtx); 3987 ip6 = realloc(ip6, ip6s * 3988 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 3989 goto again; 3990 } 3991 bcopy(cpr->pr_ip6, ip6, 3992 cpr->pr_ip6s * sizeof(struct in6_addr)); 3993 } 3994 #endif 3995 if (cpr->pr_ref == 0) { 3996 mtx_unlock(&cpr->pr_mtx); 3997 continue; 3998 } 3999 bzero(xp, sizeof(*xp)); 4000 xp->pr_version = XPRISON_VERSION; 4001 xp->pr_id = cpr->pr_id; 4002 xp->pr_state = cpr->pr_uref > 0 4003 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 4004 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 4005 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 4006 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 4007 #ifdef INET 4008 xp->pr_ip4s = cpr->pr_ip4s; 4009 #endif 4010 #ifdef INET6 4011 xp->pr_ip6s = cpr->pr_ip6s; 4012 #endif 4013 mtx_unlock(&cpr->pr_mtx); 4014 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4015 if (error) 4016 break; 4017 #ifdef INET 4018 if (xp->pr_ip4s > 0) { 4019 error = SYSCTL_OUT(req, ip4, 4020 xp->pr_ip4s * sizeof(struct in_addr)); 4021 if (error) 4022 break; 4023 } 4024 #endif 4025 #ifdef INET6 4026 if (xp->pr_ip6s > 0) { 4027 error = SYSCTL_OUT(req, ip6, 4028 xp->pr_ip6s * sizeof(struct in6_addr)); 4029 if (error) 4030 break; 4031 } 4032 #endif 4033 } 4034 sx_sunlock(&allprison_lock); 4035 free(xp, M_TEMP); 4036 #ifdef INET 4037 free(ip4, M_TEMP); 4038 #endif 4039 #ifdef INET6 4040 free(ip6, M_TEMP); 4041 #endif 4042 return (error); 4043 } 4044 4045 SYSCTL_OID(_security_jail, OID_AUTO, list, 4046 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4047 sysctl_jail_list, "S", "List of active jails"); 4048 4049 static int 4050 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4051 { 4052 int error, injail; 4053 4054 injail = jailed(req->td->td_ucred); 4055 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4056 4057 return (error); 4058 } 4059 4060 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4061 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4062 sysctl_jail_jailed, "I", "Process in jail?"); 4063 4064 #if defined(INET) || defined(INET6) 4065 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4066 &jail_max_af_ips, 0, 4067 "Number of IP addresses a jail may have at most per address family"); 4068 #endif 4069 4070 /* 4071 * Default parameters for jail(2) compatability. For historical reasons, 4072 * the sysctl names have varying similarity to the parameter names. Prisons 4073 * just see their own parameters, and can't change them. 4074 */ 4075 static int 4076 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4077 { 4078 struct prison *pr; 4079 int allow, error, i; 4080 4081 pr = req->td->td_ucred->cr_prison; 4082 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4083 4084 /* Get the current flag value, and convert it to a boolean. */ 4085 i = (allow & arg2) ? 1 : 0; 4086 if (arg1 != NULL) 4087 i = !i; 4088 error = sysctl_handle_int(oidp, &i, 0, req); 4089 if (error || !req->newptr) 4090 return (error); 4091 i = i ? arg2 : 0; 4092 if (arg1 != NULL) 4093 i ^= arg2; 4094 /* 4095 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4096 * for writing. 4097 */ 4098 mtx_lock(&prison0.pr_mtx); 4099 jail_default_allow = (jail_default_allow & ~arg2) | i; 4100 mtx_unlock(&prison0.pr_mtx); 4101 return (0); 4102 } 4103 4104 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4105 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4106 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4107 "Processes in jail can set their hostnames"); 4108 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4109 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4110 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4111 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 4112 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4113 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4114 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4115 "Processes in jail can use System V IPC primitives"); 4116 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4117 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4118 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4119 "Prison root can create raw sockets"); 4120 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4121 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4122 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4123 "Processes in jail can alter system file flags"); 4124 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4125 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4126 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4127 "Processes in jail can mount/unmount jail-friendly file systems"); 4128 4129 static int 4130 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4131 { 4132 struct prison *pr; 4133 int level, error; 4134 4135 pr = req->td->td_ucred->cr_prison; 4136 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4137 error = sysctl_handle_int(oidp, &level, 0, req); 4138 if (error || !req->newptr) 4139 return (error); 4140 *(int *)arg1 = level; 4141 return (0); 4142 } 4143 4144 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4145 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4146 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4147 sysctl_jail_default_level, "I", 4148 "Processes in jail cannot see all mounted file systems"); 4149 4150 /* 4151 * Nodes to describe jail parameters. Maximum length of string parameters 4152 * is returned in the string itself, and the other parameters exist merely 4153 * to make themselves and their types known. 4154 */ 4155 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4156 "Jail parameters"); 4157 4158 int 4159 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4160 { 4161 int i; 4162 long l; 4163 size_t s; 4164 char numbuf[12]; 4165 4166 switch (oidp->oid_kind & CTLTYPE) 4167 { 4168 case CTLTYPE_LONG: 4169 case CTLTYPE_ULONG: 4170 l = 0; 4171 #ifdef SCTL_MASK32 4172 if (!(req->flags & SCTL_MASK32)) 4173 #endif 4174 return (SYSCTL_OUT(req, &l, sizeof(l))); 4175 case CTLTYPE_INT: 4176 case CTLTYPE_UINT: 4177 i = 0; 4178 return (SYSCTL_OUT(req, &i, sizeof(i))); 4179 case CTLTYPE_STRING: 4180 snprintf(numbuf, sizeof(numbuf), "%d", arg2); 4181 return 4182 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4183 case CTLTYPE_STRUCT: 4184 s = (size_t)arg2; 4185 return (SYSCTL_OUT(req, &s, sizeof(s))); 4186 } 4187 return (0); 4188 } 4189 4190 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4191 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4192 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4193 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4194 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4195 "I", "Jail secure level"); 4196 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4197 "I", "Jail cannot see all mounted file systems"); 4198 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4199 "B", "Jail persistence"); 4200 #ifdef VIMAGE 4201 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4202 "E,jailsys", "Virtual network stack"); 4203 #endif 4204 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4205 "B", "Jail is in the process of shutting down"); 4206 4207 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4208 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4209 "I", "Current number of child jails"); 4210 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4211 "I", "Maximum number of child jails"); 4212 4213 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4214 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4215 "Jail hostname"); 4216 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4217 "Jail NIS domainname"); 4218 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4219 "Jail host UUID"); 4220 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4221 "LU", "Jail host ID"); 4222 4223 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4224 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4225 4226 #ifdef INET 4227 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4228 "Jail IPv4 address virtualization"); 4229 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4230 "S,in_addr,a", "Jail IPv4 addresses"); 4231 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4232 "B", "Do (not) use IPv4 source address selection rather than the " 4233 "primary jail IPv4 address."); 4234 #endif 4235 #ifdef INET6 4236 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4237 "Jail IPv6 address virtualization"); 4238 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4239 "S,in6_addr,a", "Jail IPv6 addresses"); 4240 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4241 "B", "Do (not) use IPv6 source address selection rather than the " 4242 "primary jail IPv6 address."); 4243 #endif 4244 4245 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4246 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4247 "B", "Jail may set hostname"); 4248 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4249 "B", "Jail may use SYSV IPC"); 4250 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4251 "B", "Jail may create raw sockets"); 4252 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4253 "B", "Jail may alter system file flags"); 4254 SYSCTL_JAIL_PARAM(_allow, mount, CTLTYPE_INT | CTLFLAG_RW, 4255 "B", "Jail may mount/unmount jail-friendly file systems"); 4256 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4257 "B", "Jail may set file quotas"); 4258 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4259 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4260 4261 4262 #ifdef DDB 4263 4264 static void 4265 db_show_prison(struct prison *pr) 4266 { 4267 int fi; 4268 #if defined(INET) || defined(INET6) 4269 int ii; 4270 #endif 4271 unsigned jsf; 4272 #ifdef INET6 4273 char ip6buf[INET6_ADDRSTRLEN]; 4274 #endif 4275 4276 db_printf("prison %p:\n", pr); 4277 db_printf(" jid = %d\n", pr->pr_id); 4278 db_printf(" name = %s\n", pr->pr_name); 4279 db_printf(" parent = %p\n", pr->pr_parent); 4280 db_printf(" ref = %d\n", pr->pr_ref); 4281 db_printf(" uref = %d\n", pr->pr_uref); 4282 db_printf(" path = %s\n", pr->pr_path); 4283 db_printf(" cpuset = %d\n", pr->pr_cpuset 4284 ? pr->pr_cpuset->cs_id : -1); 4285 #ifdef VIMAGE 4286 db_printf(" vnet = %p\n", pr->pr_vnet); 4287 #endif 4288 db_printf(" root = %p\n", pr->pr_root); 4289 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4290 db_printf(" children.max = %d\n", pr->pr_childmax); 4291 db_printf(" children.cur = %d\n", pr->pr_childcount); 4292 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4293 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4294 db_printf(" flags = 0x%x", pr->pr_flags); 4295 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4296 fi++) 4297 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4298 db_printf(" %s", pr_flag_names[fi]); 4299 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4300 fi++) { 4301 jsf = pr->pr_flags & 4302 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4303 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4304 pr_flag_jailsys[fi].disable && 4305 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4306 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4307 : "inherit"); 4308 } 4309 db_printf(" allow = 0x%x", pr->pr_allow); 4310 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4311 fi++) 4312 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4313 db_printf(" %s", pr_allow_names[fi]); 4314 db_printf("\n"); 4315 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4316 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4317 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4318 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4319 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4320 #ifdef INET 4321 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4322 for (ii = 0; ii < pr->pr_ip4s; ii++) 4323 db_printf(" %s %s\n", 4324 ii == 0 ? "ip4.addr =" : " ", 4325 inet_ntoa(pr->pr_ip4[ii])); 4326 #endif 4327 #ifdef INET6 4328 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4329 for (ii = 0; ii < pr->pr_ip6s; ii++) 4330 db_printf(" %s %s\n", 4331 ii == 0 ? "ip6.addr =" : " ", 4332 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4333 #endif 4334 } 4335 4336 DB_SHOW_COMMAND(prison, db_show_prison_command) 4337 { 4338 struct prison *pr; 4339 4340 if (!have_addr) { 4341 /* 4342 * Show all prisons in the list, and prison0 which is not 4343 * listed. 4344 */ 4345 db_show_prison(&prison0); 4346 if (!db_pager_quit) { 4347 TAILQ_FOREACH(pr, &allprison, pr_list) { 4348 db_show_prison(pr); 4349 if (db_pager_quit) 4350 break; 4351 } 4352 } 4353 return; 4354 } 4355 4356 if (addr == 0) 4357 pr = &prison0; 4358 else { 4359 /* Look for a prison with the ID and with references. */ 4360 TAILQ_FOREACH(pr, &allprison, pr_list) 4361 if (pr->pr_id == addr && pr->pr_ref > 0) 4362 break; 4363 if (pr == NULL) 4364 /* Look again, without requiring a reference. */ 4365 TAILQ_FOREACH(pr, &allprison, pr_list) 4366 if (pr->pr_id == addr) 4367 break; 4368 if (pr == NULL) 4369 /* Assume address points to a valid prison. */ 4370 pr = (struct prison *)addr; 4371 } 4372 db_show_prison(pr); 4373 } 4374 4375 #endif /* DDB */
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