1 /*- 2 * Copyright (c) 1999 Poul-Henning Kamp. 3 * Copyright (c) 2008 Bjoern A. Zeeb. 4 * Copyright (c) 2009 James Gritton. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_compat.h" 33 #include "opt_ddb.h" 34 #include "opt_inet.h" 35 #include "opt_inet6.h" 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/kernel.h> 40 #include <sys/systm.h> 41 #include <sys/errno.h> 42 #include <sys/sysproto.h> 43 #include <sys/malloc.h> 44 #include <sys/osd.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/taskqueue.h> 48 #include <sys/fcntl.h> 49 #include <sys/jail.h> 50 #include <sys/lock.h> 51 #include <sys/mutex.h> 52 #include <sys/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 #include <sys/vimage.h> 62 #include <net/if.h> 63 #include <netinet/in.h> 64 #ifdef DDB 65 #include <ddb/ddb.h> 66 #ifdef INET6 67 #include <netinet6/in6_var.h> 68 #endif /* INET6 */ 69 #endif /* DDB */ 70 71 #include <security/mac/mac_framework.h> 72 73 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 74 75 /* prison0 describes what is "real" about the system. */ 76 struct prison prison0 = { 77 .pr_id = 0, 78 .pr_name = "0", 79 .pr_ref = 1, 80 .pr_uref = 1, 81 .pr_path = "/", 82 .pr_securelevel = -1, 83 .pr_childmax = JAIL_MAX, 84 .pr_hostuuid = "00000000-0000-0000-0000-000000000000", 85 .pr_children = LIST_HEAD_INITIALIZER(&prison0.pr_children), 86 .pr_flags = PR_HOST, 87 .pr_allow = PR_ALLOW_ALL, 88 }; 89 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 90 91 /* allprison and lastprid are protected by allprison_lock. */ 92 struct sx allprison_lock; 93 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 94 struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 95 int lastprid = 0; 96 97 static int do_jail_attach(struct thread *td, struct prison *pr); 98 static void prison_complete(void *context, int pending); 99 static void prison_deref(struct prison *pr, int flags); 100 static char *prison_path(struct prison *pr1, struct prison *pr2); 101 static void prison_remove_one(struct prison *pr); 102 #ifdef INET 103 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia); 104 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4); 105 #endif 106 #ifdef INET6 107 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6); 108 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6); 109 #endif 110 111 /* Flags for prison_deref */ 112 #define PD_DEREF 0x01 113 #define PD_DEUREF 0x02 114 #define PD_LOCKED 0x04 115 #define PD_LIST_SLOCKED 0x08 116 #define PD_LIST_XLOCKED 0x10 117 118 /* 119 * Parameter names corresponding to PR_* flag values 120 */ 121 static char *pr_flag_names[] = { 122 [0] = "persist", 123 "host", 124 #ifdef INET 125 "ip4", 126 #endif 127 #ifdef INET6 128 [3] = "ip6", 129 #endif 130 #ifdef VIMAGE 131 [4] = "vnet", 132 #endif 133 }; 134 135 static char *pr_flag_nonames[] = { 136 [0] = "nopersist", 137 "nohost", 138 #ifdef INET 139 "noip4", 140 #endif 141 #ifdef INET6 142 [3] = "noip6", 143 #endif 144 #ifdef VIMAGE 145 [4] = "novnet", 146 #endif 147 }; 148 149 static char *pr_allow_names[] = { 150 "allow.set_hostname", 151 "allow.sysvipc", 152 "allow.raw_sockets", 153 "allow.chflags", 154 "allow.mount", 155 "allow.quotas", 156 "allow.socket_af", 157 }; 158 159 static char *pr_allow_nonames[] = { 160 "allow.noset_hostname", 161 "allow.nosysvipc", 162 "allow.noraw_sockets", 163 "allow.nochflags", 164 "allow.nomount", 165 "allow.noquotas", 166 "allow.nosocket_af", 167 }; 168 169 #define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME 170 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 171 static int jail_default_enforce_statfs = 2; 172 #if defined(INET) || defined(INET6) 173 static unsigned jail_max_af_ips = 255; 174 #endif 175 176 #ifdef INET 177 static int 178 qcmp_v4(const void *ip1, const void *ip2) 179 { 180 in_addr_t iaa, iab; 181 182 /* 183 * We need to compare in HBO here to get the list sorted as expected 184 * by the result of the code. Sorting NBO addresses gives you 185 * interesting results. If you do not understand, do not try. 186 */ 187 iaa = ntohl(((const struct in_addr *)ip1)->s_addr); 188 iab = ntohl(((const struct in_addr *)ip2)->s_addr); 189 190 /* 191 * Do not simply return the difference of the two numbers, the int is 192 * not wide enough. 193 */ 194 if (iaa > iab) 195 return (1); 196 else if (iaa < iab) 197 return (-1); 198 else 199 return (0); 200 } 201 #endif 202 203 #ifdef INET6 204 static int 205 qcmp_v6(const void *ip1, const void *ip2) 206 { 207 const struct in6_addr *ia6a, *ia6b; 208 int i, rc; 209 210 ia6a = (const struct in6_addr *)ip1; 211 ia6b = (const struct in6_addr *)ip2; 212 213 rc = 0; 214 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { 215 if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) 216 rc = 1; 217 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) 218 rc = -1; 219 } 220 return (rc); 221 } 222 #endif 223 224 /* 225 * struct jail_args { 226 * struct jail *jail; 227 * }; 228 */ 229 int 230 jail(struct thread *td, struct jail_args *uap) 231 { 232 uint32_t version; 233 int error; 234 struct jail j; 235 236 error = copyin(uap->jail, &version, sizeof(uint32_t)); 237 if (error) 238 return (error); 239 240 switch (version) { 241 case 0: 242 { 243 struct jail_v0 j0; 244 245 /* FreeBSD single IPv4 jails. */ 246 bzero(&j, sizeof(struct jail)); 247 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 248 if (error) 249 return (error); 250 j.version = j0.version; 251 j.path = j0.path; 252 j.hostname = j0.hostname; 253 j.ip4s = j0.ip_number; 254 break; 255 } 256 257 case 1: 258 /* 259 * Version 1 was used by multi-IPv4 jail implementations 260 * that never made it into the official kernel. 261 */ 262 return (EINVAL); 263 264 case 2: /* JAIL_API_VERSION */ 265 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 266 error = copyin(uap->jail, &j, sizeof(struct jail)); 267 if (error) 268 return (error); 269 break; 270 271 default: 272 /* Sci-Fi jails are not supported, sorry. */ 273 return (EINVAL); 274 } 275 return (kern_jail(td, &j)); 276 } 277 278 int 279 kern_jail(struct thread *td, struct jail *j) 280 { 281 struct iovec optiov[2 * (4 282 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0]) 283 #ifdef INET 284 + 1 285 #endif 286 #ifdef INET6 287 + 1 288 #endif 289 )]; 290 struct uio opt; 291 char *u_path, *u_hostname, *u_name; 292 #ifdef INET 293 uint32_t ip4s; 294 struct in_addr *u_ip4; 295 #endif 296 #ifdef INET6 297 struct in6_addr *u_ip6; 298 #endif 299 size_t tmplen; 300 int error, enforce_statfs, fi; 301 302 bzero(&optiov, sizeof(optiov)); 303 opt.uio_iov = optiov; 304 opt.uio_iovcnt = 0; 305 opt.uio_offset = -1; 306 opt.uio_resid = -1; 307 opt.uio_segflg = UIO_SYSSPACE; 308 opt.uio_rw = UIO_READ; 309 opt.uio_td = td; 310 311 /* Set permissions for top-level jails from sysctls. */ 312 if (!jailed(td->td_ucred)) { 313 for (fi = 0; fi < sizeof(pr_allow_names) / 314 sizeof(pr_allow_names[0]); fi++) { 315 optiov[opt.uio_iovcnt].iov_base = 316 (jail_default_allow & (1 << fi)) 317 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 318 optiov[opt.uio_iovcnt].iov_len = 319 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 320 opt.uio_iovcnt += 2; 321 } 322 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 323 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 324 opt.uio_iovcnt++; 325 enforce_statfs = jail_default_enforce_statfs; 326 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 327 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 328 opt.uio_iovcnt++; 329 } 330 331 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 332 #ifdef INET 333 ip4s = (j->version == 0) ? 1 : j->ip4s; 334 if (ip4s > jail_max_af_ips) 335 return (EINVAL); 336 tmplen += ip4s * sizeof(struct in_addr); 337 #else 338 if (j->ip4s > 0) 339 return (EINVAL); 340 #endif 341 #ifdef INET6 342 if (j->ip6s > jail_max_af_ips) 343 return (EINVAL); 344 tmplen += j->ip6s * sizeof(struct in6_addr); 345 #else 346 if (j->ip6s > 0) 347 return (EINVAL); 348 #endif 349 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 350 u_hostname = u_path + MAXPATHLEN; 351 u_name = u_hostname + MAXHOSTNAMELEN; 352 #ifdef INET 353 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 354 #endif 355 #ifdef INET6 356 #ifdef INET 357 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 358 #else 359 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 360 #endif 361 #endif 362 optiov[opt.uio_iovcnt].iov_base = "path"; 363 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 364 opt.uio_iovcnt++; 365 optiov[opt.uio_iovcnt].iov_base = u_path; 366 error = copyinstr(j->path, u_path, MAXPATHLEN, 367 &optiov[opt.uio_iovcnt].iov_len); 368 if (error) { 369 free(u_path, M_TEMP); 370 return (error); 371 } 372 opt.uio_iovcnt++; 373 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 374 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 375 opt.uio_iovcnt++; 376 optiov[opt.uio_iovcnt].iov_base = u_hostname; 377 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 378 &optiov[opt.uio_iovcnt].iov_len); 379 if (error) { 380 free(u_path, M_TEMP); 381 return (error); 382 } 383 opt.uio_iovcnt++; 384 if (j->jailname != NULL) { 385 optiov[opt.uio_iovcnt].iov_base = "name"; 386 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 387 opt.uio_iovcnt++; 388 optiov[opt.uio_iovcnt].iov_base = u_name; 389 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 390 &optiov[opt.uio_iovcnt].iov_len); 391 if (error) { 392 free(u_path, M_TEMP); 393 return (error); 394 } 395 opt.uio_iovcnt++; 396 } 397 #ifdef INET 398 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 399 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 400 opt.uio_iovcnt++; 401 optiov[opt.uio_iovcnt].iov_base = u_ip4; 402 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 403 if (j->version == 0) 404 u_ip4->s_addr = j->ip4s; 405 else { 406 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 407 if (error) { 408 free(u_path, M_TEMP); 409 return (error); 410 } 411 } 412 opt.uio_iovcnt++; 413 #endif 414 #ifdef INET6 415 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 416 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 417 opt.uio_iovcnt++; 418 optiov[opt.uio_iovcnt].iov_base = u_ip6; 419 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 420 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 421 if (error) { 422 free(u_path, M_TEMP); 423 return (error); 424 } 425 opt.uio_iovcnt++; 426 #endif 427 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]), 428 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 429 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 430 free(u_path, M_TEMP); 431 return (error); 432 } 433 434 435 /* 436 * struct jail_set_args { 437 * struct iovec *iovp; 438 * unsigned int iovcnt; 439 * int flags; 440 * }; 441 */ 442 int 443 jail_set(struct thread *td, struct jail_set_args *uap) 444 { 445 struct uio *auio; 446 int error; 447 448 /* Check that we have an even number of iovecs. */ 449 if (uap->iovcnt & 1) 450 return (EINVAL); 451 452 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 453 if (error) 454 return (error); 455 error = kern_jail_set(td, auio, uap->flags); 456 free(auio, M_IOV); 457 return (error); 458 } 459 460 int 461 kern_jail_set(struct thread *td, struct uio *optuio, int flags) 462 { 463 struct nameidata nd; 464 #ifdef INET 465 struct in_addr *ip4; 466 #endif 467 #ifdef INET6 468 struct in6_addr *ip6; 469 #endif 470 struct vfsopt *opt; 471 struct vfsoptlist *opts; 472 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 473 struct vnode *root; 474 char *domain, *errmsg, *host, *name, *p, *path, *uuid; 475 #if defined(INET) || defined(INET6) 476 void *op; 477 #endif 478 unsigned long hid; 479 size_t namelen, onamelen; 480 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos; 481 int gotchildmax, gotenforce, gothid, gotslevel, fi, jid, len, level; 482 int childmax, slevel, vfslocked; 483 #if defined(INET) || defined(INET6) 484 int ii, ij; 485 #endif 486 #ifdef INET 487 int ip4s, ip4a, redo_ip4; 488 #endif 489 #ifdef INET6 490 int ip6s, ip6a, redo_ip6; 491 #endif 492 unsigned pr_flags, ch_flags; 493 unsigned pr_allow, ch_allow, tallow; 494 char numbuf[12]; 495 496 error = priv_check(td, PRIV_JAIL_SET); 497 if (!error && (flags & JAIL_ATTACH)) 498 error = priv_check(td, PRIV_JAIL_ATTACH); 499 if (error) 500 return (error); 501 mypr = ppr = td->td_ucred->cr_prison; 502 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 503 return (EPERM); 504 if (flags & ~JAIL_SET_MASK) 505 return (EINVAL); 506 507 /* 508 * Check all the parameters before committing to anything. Not all 509 * errors can be caught early, but we may as well try. Also, this 510 * takes care of some expensive stuff (path lookup) before getting 511 * the allprison lock. 512 * 513 * XXX Jails are not filesystems, and jail parameters are not mount 514 * options. But it makes more sense to re-use the vfsopt code 515 * than duplicate it under a different name. 516 */ 517 error = vfs_buildopts(optuio, &opts); 518 if (error) 519 return (error); 520 #ifdef INET 521 ip4a = 0; 522 ip4 = NULL; 523 #endif 524 #ifdef INET6 525 ip6a = 0; 526 ip6 = NULL; 527 #endif 528 529 #if defined(INET) || defined(INET6) 530 again: 531 #endif 532 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 533 if (error == ENOENT) 534 jid = 0; 535 else if (error != 0) 536 goto done_free; 537 538 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 539 if (error == ENOENT) 540 gotslevel = 0; 541 else if (error != 0) 542 goto done_free; 543 else 544 gotslevel = 1; 545 546 error = 547 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 548 if (error == ENOENT) 549 gotchildmax = 0; 550 else if (error != 0) 551 goto done_free; 552 else 553 gotchildmax = 1; 554 555 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 556 gotenforce = (error == 0); 557 if (gotenforce) { 558 if (enforce < 0 || enforce > 2) 559 return (EINVAL); 560 } else if (error != ENOENT) 561 goto done_free; 562 563 pr_flags = ch_flags = 0; 564 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 565 fi++) { 566 if (pr_flag_names[fi] == NULL) 567 continue; 568 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 569 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 570 } 571 ch_flags |= pr_flags; 572 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 573 && !(pr_flags & PR_PERSIST)) { 574 error = EINVAL; 575 vfs_opterror(opts, "new jail must persist or attach"); 576 goto done_errmsg; 577 } 578 #ifdef VIMAGE 579 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 580 error = EINVAL; 581 vfs_opterror(opts, "vnet cannot be changed after creation"); 582 goto done_errmsg; 583 } 584 #endif 585 586 pr_allow = ch_allow = 0; 587 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 588 fi++) { 589 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 590 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 591 } 592 ch_allow |= pr_allow; 593 594 error = vfs_getopt(opts, "name", (void **)&name, &len); 595 if (error == ENOENT) 596 name = NULL; 597 else if (error != 0) 598 goto done_free; 599 else { 600 if (len == 0 || name[len - 1] != '\0') { 601 error = EINVAL; 602 goto done_free; 603 } 604 if (len > MAXHOSTNAMELEN) { 605 error = ENAMETOOLONG; 606 goto done_free; 607 } 608 } 609 610 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 611 if (error == ENOENT) 612 host = NULL; 613 else if (error != 0) 614 goto done_free; 615 else { 616 ch_flags |= PR_HOST; 617 pr_flags |= PR_HOST; 618 if (len == 0 || host[len - 1] != '\0') { 619 error = EINVAL; 620 goto done_free; 621 } 622 if (len > MAXHOSTNAMELEN) { 623 error = ENAMETOOLONG; 624 goto done_free; 625 } 626 } 627 628 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 629 if (error == ENOENT) 630 domain = NULL; 631 else if (error != 0) 632 goto done_free; 633 else { 634 ch_flags |= PR_HOST; 635 pr_flags |= PR_HOST; 636 if (len == 0 || domain[len - 1] != '\0') { 637 error = EINVAL; 638 goto done_free; 639 } 640 if (len > MAXHOSTNAMELEN) { 641 error = ENAMETOOLONG; 642 goto done_free; 643 } 644 } 645 646 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 647 if (error == ENOENT) 648 uuid = NULL; 649 else if (error != 0) 650 goto done_free; 651 else { 652 ch_flags |= PR_HOST; 653 pr_flags |= PR_HOST; 654 if (len == 0 || uuid[len - 1] != '\0') { 655 error = EINVAL; 656 goto done_free; 657 } 658 if (len > HOSTUUIDLEN) { 659 error = ENAMETOOLONG; 660 goto done_free; 661 } 662 } 663 664 #ifdef COMPAT_IA32 665 if (td->td_proc->p_sysent->sv_flags & SV_IA32) { 666 uint32_t hid32; 667 668 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 669 hid = hid32; 670 } else 671 #endif 672 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 673 if (error == ENOENT) 674 gothid = 0; 675 else if (error != 0) 676 goto done_free; 677 else { 678 gothid = 1; 679 ch_flags |= PR_HOST; 680 pr_flags |= PR_HOST; 681 } 682 683 /* This might be the second time around for this option. */ 684 #ifdef INET 685 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 686 if (error == ENOENT) 687 ip4s = -1; 688 else if (error != 0) 689 goto done_free; 690 else if (ip4s & (sizeof(*ip4) - 1)) { 691 error = EINVAL; 692 goto done_free; 693 } else { 694 ch_flags |= PR_IP4_USER; 695 pr_flags |= PR_IP4_USER; 696 if (ip4s > 0) { 697 ip4s /= sizeof(*ip4); 698 if (ip4s > jail_max_af_ips) { 699 error = EINVAL; 700 vfs_opterror(opts, "too many IPv4 addresses"); 701 goto done_errmsg; 702 } 703 if (ip4a < ip4s) { 704 ip4a = ip4s; 705 free(ip4, M_PRISON); 706 ip4 = NULL; 707 } 708 if (ip4 == NULL) 709 ip4 = malloc(ip4a * sizeof(*ip4), M_PRISON, 710 M_WAITOK); 711 bcopy(op, ip4, ip4s * sizeof(*ip4)); 712 /* 713 * IP addresses are all sorted but ip[0] to preserve 714 * the primary IP address as given from userland. 715 * This special IP is used for unbound outgoing 716 * connections as well for "loopback" traffic. 717 */ 718 if (ip4s > 1) 719 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4); 720 /* 721 * Check for duplicate addresses and do some simple 722 * zero and broadcast checks. If users give other bogus 723 * addresses it is their problem. 724 * 725 * We do not have to care about byte order for these 726 * checks so we will do them in NBO. 727 */ 728 for (ii = 0; ii < ip4s; ii++) { 729 if (ip4[ii].s_addr == INADDR_ANY || 730 ip4[ii].s_addr == INADDR_BROADCAST) { 731 error = EINVAL; 732 goto done_free; 733 } 734 if ((ii+1) < ip4s && 735 (ip4[0].s_addr == ip4[ii+1].s_addr || 736 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 737 error = EINVAL; 738 goto done_free; 739 } 740 } 741 } 742 } 743 #endif 744 745 #ifdef INET6 746 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 747 if (error == ENOENT) 748 ip6s = -1; 749 else if (error != 0) 750 goto done_free; 751 else if (ip6s & (sizeof(*ip6) - 1)) { 752 error = EINVAL; 753 goto done_free; 754 } else { 755 ch_flags |= PR_IP6_USER; 756 pr_flags |= PR_IP6_USER; 757 if (ip6s > 0) { 758 ip6s /= sizeof(*ip6); 759 if (ip6s > jail_max_af_ips) { 760 error = EINVAL; 761 vfs_opterror(opts, "too many IPv6 addresses"); 762 goto done_errmsg; 763 } 764 if (ip6a < ip6s) { 765 ip6a = ip6s; 766 free(ip6, M_PRISON); 767 ip6 = NULL; 768 } 769 if (ip6 == NULL) 770 ip6 = malloc(ip6a * sizeof(*ip6), M_PRISON, 771 M_WAITOK); 772 bcopy(op, ip6, ip6s * sizeof(*ip6)); 773 if (ip6s > 1) 774 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6); 775 for (ii = 0; ii < ip6s; ii++) { 776 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 777 error = EINVAL; 778 goto done_free; 779 } 780 if ((ii+1) < ip6s && 781 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 782 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 783 { 784 error = EINVAL; 785 goto done_free; 786 } 787 } 788 } 789 } 790 #endif 791 792 root = NULL; 793 error = vfs_getopt(opts, "path", (void **)&path, &len); 794 if (error == ENOENT) 795 path = NULL; 796 else if (error != 0) 797 goto done_free; 798 else { 799 if (flags & JAIL_UPDATE) { 800 error = EINVAL; 801 vfs_opterror(opts, 802 "path cannot be changed after creation"); 803 goto done_errmsg; 804 } 805 if (len == 0 || path[len - 1] != '\0') { 806 error = EINVAL; 807 goto done_free; 808 } 809 if (len < 2 || (len == 2 && path[0] == '/')) 810 path = NULL; 811 else { 812 /* Leave room for a real-root full pathname. */ 813 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 814 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 815 error = ENAMETOOLONG; 816 goto done_free; 817 } 818 NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW, UIO_SYSSPACE, 819 path, td); 820 error = namei(&nd); 821 if (error) 822 goto done_free; 823 vfslocked = NDHASGIANT(&nd); 824 root = nd.ni_vp; 825 NDFREE(&nd, NDF_ONLY_PNBUF); 826 if (root->v_type != VDIR) { 827 error = ENOTDIR; 828 vrele(root); 829 VFS_UNLOCK_GIANT(vfslocked); 830 goto done_free; 831 } 832 VFS_UNLOCK_GIANT(vfslocked); 833 } 834 } 835 836 /* 837 * Grab the allprison lock before letting modules check their 838 * parameters. Once we have it, do not let go so we'll have a 839 * consistent view of the OSD list. 840 */ 841 sx_xlock(&allprison_lock); 842 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts); 843 if (error) 844 goto done_unlock_list; 845 846 /* By now, all parameters should have been noted. */ 847 TAILQ_FOREACH(opt, opts, link) { 848 if (!opt->seen && strcmp(opt->name, "errmsg")) { 849 error = EINVAL; 850 vfs_opterror(opts, "unknown parameter: %s", opt->name); 851 goto done_unlock_list; 852 } 853 } 854 855 /* 856 * See if we are creating a new record or updating an existing one. 857 * This abuses the file error codes ENOENT and EEXIST. 858 */ 859 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 860 if (!cuflags) { 861 error = EINVAL; 862 vfs_opterror(opts, "no valid operation (create or update)"); 863 goto done_unlock_list; 864 } 865 pr = NULL; 866 if (jid != 0) { 867 /* 868 * See if a requested jid already exists. There is an 869 * information leak here if the jid exists but is not within 870 * the caller's jail hierarchy. Jail creators will get EEXIST 871 * even though they cannot see the jail, and CREATE | UPDATE 872 * will return ENOENT which is not normally a valid error. 873 */ 874 if (jid < 0) { 875 error = EINVAL; 876 vfs_opterror(opts, "negative jid"); 877 goto done_unlock_list; 878 } 879 pr = prison_find(jid); 880 if (pr != NULL) { 881 ppr = pr->pr_parent; 882 /* Create: jid must not exist. */ 883 if (cuflags == JAIL_CREATE) { 884 mtx_unlock(&pr->pr_mtx); 885 error = EEXIST; 886 vfs_opterror(opts, "jail %d already exists", 887 jid); 888 goto done_unlock_list; 889 } 890 if (!prison_ischild(mypr, pr)) { 891 mtx_unlock(&pr->pr_mtx); 892 pr = NULL; 893 } else if (pr->pr_uref == 0) { 894 if (!(flags & JAIL_DYING)) { 895 mtx_unlock(&pr->pr_mtx); 896 error = ENOENT; 897 vfs_opterror(opts, "jail %d is dying", 898 jid); 899 goto done_unlock_list; 900 } else if ((flags & JAIL_ATTACH) || 901 (pr_flags & PR_PERSIST)) { 902 /* 903 * A dying jail might be resurrected 904 * (via attach or persist), but first 905 * it must determine if another jail 906 * has claimed its name. Accomplish 907 * this by implicitly re-setting the 908 * name. 909 */ 910 if (name == NULL) 911 name = prison_name(mypr, pr); 912 } 913 } 914 } 915 if (pr == NULL) { 916 /* Update: jid must exist. */ 917 if (cuflags == JAIL_UPDATE) { 918 error = ENOENT; 919 vfs_opterror(opts, "jail %d not found", jid); 920 goto done_unlock_list; 921 } 922 } 923 } 924 /* 925 * If the caller provided a name, look for a jail by that name. 926 * This has different semantics for creates and updates keyed by jid 927 * (where the name must not already exist in a different jail), 928 * and updates keyed by the name itself (where the name must exist 929 * because that is the jail being updated). 930 */ 931 if (name != NULL) { 932 p = strrchr(name, '.'); 933 if (p != NULL) { 934 /* 935 * This is a hierarchical name. Split it into the 936 * parent and child names, and make sure the parent 937 * exists or matches an already found jail. 938 */ 939 *p = '\0'; 940 if (pr != NULL) { 941 if (strncmp(name, ppr->pr_name, p - name) || 942 ppr->pr_name[p - name] != '\0') { 943 mtx_unlock(&pr->pr_mtx); 944 error = EINVAL; 945 vfs_opterror(opts, 946 "cannot change jail's parent"); 947 goto done_unlock_list; 948 } 949 } else { 950 ppr = prison_find_name(mypr, name); 951 if (ppr == NULL) { 952 error = ENOENT; 953 vfs_opterror(opts, 954 "jail \"%s\" not found", name); 955 goto done_unlock_list; 956 } 957 mtx_unlock(&ppr->pr_mtx); 958 } 959 name = p + 1; 960 } 961 if (name[0] != '\0') { 962 namelen = 963 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 964 name_again: 965 deadpr = NULL; 966 FOREACH_PRISON_CHILD(ppr, tpr) { 967 if (tpr != pr && tpr->pr_ref > 0 && 968 !strcmp(tpr->pr_name + namelen, name)) { 969 if (pr == NULL && 970 cuflags != JAIL_CREATE) { 971 mtx_lock(&tpr->pr_mtx); 972 if (tpr->pr_ref > 0) { 973 /* 974 * Use this jail 975 * for updates. 976 */ 977 if (tpr->pr_uref > 0) { 978 pr = tpr; 979 break; 980 } 981 deadpr = tpr; 982 } 983 mtx_unlock(&tpr->pr_mtx); 984 } else if (tpr->pr_uref > 0) { 985 /* 986 * Create, or update(jid): 987 * name must not exist in an 988 * active sibling jail. 989 */ 990 error = EEXIST; 991 if (pr != NULL) 992 mtx_unlock(&pr->pr_mtx); 993 vfs_opterror(opts, 994 "jail \"%s\" already exists", 995 name); 996 goto done_unlock_list; 997 } 998 } 999 } 1000 /* If no active jail is found, use a dying one. */ 1001 if (deadpr != NULL && pr == NULL) { 1002 if (flags & JAIL_DYING) { 1003 mtx_lock(&deadpr->pr_mtx); 1004 if (deadpr->pr_ref == 0) { 1005 mtx_unlock(&deadpr->pr_mtx); 1006 goto name_again; 1007 } 1008 pr = deadpr; 1009 } else if (cuflags == JAIL_UPDATE) { 1010 error = ENOENT; 1011 vfs_opterror(opts, 1012 "jail \"%s\" is dying", name); 1013 goto done_unlock_list; 1014 } 1015 } 1016 /* Update: name must exist if no jid. */ 1017 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1018 error = ENOENT; 1019 vfs_opterror(opts, "jail \"%s\" not found", 1020 name); 1021 goto done_unlock_list; 1022 } 1023 } 1024 } 1025 /* Update: must provide a jid or name. */ 1026 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1027 error = ENOENT; 1028 vfs_opterror(opts, "update specified no jail"); 1029 goto done_unlock_list; 1030 } 1031 1032 /* If there's no prison to update, create a new one and link it in. */ 1033 if (pr == NULL) { 1034 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1035 if (tpr->pr_childcount >= tpr->pr_childmax) { 1036 error = EPERM; 1037 vfs_opterror(opts, "prison limit exceeded"); 1038 goto done_unlock_list; 1039 } 1040 created = 1; 1041 mtx_lock(&ppr->pr_mtx); 1042 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) { 1043 mtx_unlock(&ppr->pr_mtx); 1044 error = ENOENT; 1045 vfs_opterror(opts, "parent jail went away!"); 1046 goto done_unlock_list; 1047 } 1048 ppr->pr_ref++; 1049 ppr->pr_uref++; 1050 mtx_unlock(&ppr->pr_mtx); 1051 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1052 if (jid == 0) { 1053 /* Find the next free jid. */ 1054 jid = lastprid + 1; 1055 findnext: 1056 if (jid == JAIL_MAX) 1057 jid = 1; 1058 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1059 if (tpr->pr_id < jid) 1060 continue; 1061 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1062 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1063 break; 1064 } 1065 if (jid == lastprid) { 1066 error = EAGAIN; 1067 vfs_opterror(opts, 1068 "no available jail IDs"); 1069 free(pr, M_PRISON); 1070 prison_deref(ppr, PD_DEREF | 1071 PD_DEUREF | PD_LIST_XLOCKED); 1072 goto done_releroot; 1073 } 1074 jid++; 1075 goto findnext; 1076 } 1077 lastprid = jid; 1078 } else { 1079 /* 1080 * The jail already has a jid (that did not yet exist), 1081 * so just find where to insert it. 1082 */ 1083 TAILQ_FOREACH(tpr, &allprison, pr_list) 1084 if (tpr->pr_id >= jid) { 1085 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1086 break; 1087 } 1088 } 1089 if (tpr == NULL) 1090 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1091 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1092 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1093 tpr->pr_childcount++; 1094 1095 pr->pr_parent = ppr; 1096 pr->pr_id = jid; 1097 1098 /* Set some default values, and inherit some from the parent. */ 1099 if (name == NULL) 1100 name = ""; 1101 if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1102 if (host == NULL) 1103 host = ppr->pr_hostname; 1104 if (domain == NULL) 1105 domain = ppr->pr_domainname; 1106 if (uuid == NULL) 1107 uuid = ppr->pr_hostuuid; 1108 if (!gothid) 1109 hid = ppr->pr_hostid; 1110 } 1111 if (path == NULL) { 1112 path = "/"; 1113 root = mypr->pr_root; 1114 vref(root); 1115 } 1116 #ifdef INET 1117 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1118 pr->pr_ip4s = ppr->pr_ip4s; 1119 if (ppr->pr_ip4 != NULL) { 1120 pr->pr_ip4 = malloc(pr->pr_ip4s * 1121 sizeof(struct in_addr), M_PRISON, M_WAITOK); 1122 bcopy(ppr->pr_ip4, pr->pr_ip4, 1123 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1124 } 1125 #endif 1126 #ifdef INET6 1127 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1128 pr->pr_ip6s = ppr->pr_ip6s; 1129 if (ppr->pr_ip6 != NULL) { 1130 pr->pr_ip6 = malloc(pr->pr_ip6s * 1131 sizeof(struct in6_addr), M_PRISON, M_WAITOK); 1132 bcopy(ppr->pr_ip6, pr->pr_ip6, 1133 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1134 } 1135 #endif 1136 pr->pr_securelevel = ppr->pr_securelevel; 1137 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1138 pr->pr_enforce_statfs = ppr->pr_enforce_statfs; 1139 1140 LIST_INIT(&pr->pr_children); 1141 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1142 1143 #ifdef VIMAGE 1144 /* Allocate a new vnet if specified. */ 1145 pr->pr_vnet = (pr_flags & PR_VNET) 1146 ? vnet_alloc() : ppr->pr_vnet; 1147 #endif 1148 /* 1149 * Allocate a dedicated cpuset for each jail. 1150 * Unlike other initial settings, this may return an erorr. 1151 */ 1152 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1153 if (error) { 1154 prison_deref(pr, PD_LIST_XLOCKED); 1155 goto done_releroot; 1156 } 1157 1158 mtx_lock(&pr->pr_mtx); 1159 /* 1160 * New prisons do not yet have a reference, because we do not 1161 * want other to see the incomplete prison once the 1162 * allprison_lock is downgraded. 1163 */ 1164 } else { 1165 created = 0; 1166 /* 1167 * Grab a reference for existing prisons, to ensure they 1168 * continue to exist for the duration of the call. 1169 */ 1170 pr->pr_ref++; 1171 } 1172 1173 /* Do final error checking before setting anything. */ 1174 if (gotslevel) { 1175 if (slevel < ppr->pr_securelevel) { 1176 error = EPERM; 1177 goto done_deref_locked; 1178 } 1179 } 1180 if (gotchildmax) { 1181 if (childmax >= ppr->pr_childmax) { 1182 error = EPERM; 1183 goto done_deref_locked; 1184 } 1185 } 1186 if (gotenforce) { 1187 if (enforce < ppr->pr_enforce_statfs) { 1188 error = EPERM; 1189 goto done_deref_locked; 1190 } 1191 } 1192 #ifdef INET 1193 if (ch_flags & PR_IP4_USER) { 1194 if (ppr->pr_flags & PR_IP4) { 1195 if (!(pr_flags & PR_IP4_USER)) { 1196 /* 1197 * Silently ignore attempts to make the IP 1198 * addresses unrestricted when the parent is 1199 * restricted; in other words, interpret 1200 * "unrestricted" as "as unrestricted as 1201 * possible". 1202 */ 1203 ip4s = ppr->pr_ip4s; 1204 if (ip4s == 0) { 1205 free(ip4, M_PRISON); 1206 ip4 = NULL; 1207 } else if (ip4s <= ip4a) { 1208 /* Inherit the parent's address(es). */ 1209 bcopy(ppr->pr_ip4, ip4, 1210 ip4s * sizeof(*ip4)); 1211 } else { 1212 /* 1213 * There's no room for the parent's 1214 * address list. Allocate some more. 1215 */ 1216 ip4a = ip4s; 1217 free(ip4, M_PRISON); 1218 ip4 = malloc(ip4a * sizeof(*ip4), 1219 M_PRISON, M_NOWAIT); 1220 if (ip4 != NULL) 1221 bcopy(ppr->pr_ip4, ip4, 1222 ip4s * sizeof(*ip4)); 1223 else { 1224 /* Allocation failed without 1225 * sleeping. Unlocking the 1226 * prison now will invalidate 1227 * some checks and prematurely 1228 * show an unfinished new jail. 1229 * So let go of everything and 1230 * start over. 1231 */ 1232 prison_deref(pr, created 1233 ? PD_LOCKED | 1234 PD_LIST_XLOCKED 1235 : PD_DEREF | PD_LOCKED | 1236 PD_LIST_XLOCKED); 1237 if (root != NULL) { 1238 vfslocked = 1239 VFS_LOCK_GIANT( 1240 root->v_mount); 1241 vrele(root); 1242 VFS_UNLOCK_GIANT( 1243 vfslocked); 1244 } 1245 ip4 = malloc(ip4a * 1246 sizeof(*ip4), M_PRISON, 1247 M_WAITOK); 1248 goto again; 1249 } 1250 } 1251 } else if (ip4s > 0) { 1252 /* 1253 * Make sure the new set of IP addresses is a 1254 * subset of the parent's list. Don't worry 1255 * about the parent being unlocked, as any 1256 * setting is done with allprison_lock held. 1257 */ 1258 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1259 if (ip4[0].s_addr == 1260 ppr->pr_ip4[ij].s_addr) 1261 break; 1262 if (ij == ppr->pr_ip4s) { 1263 error = EPERM; 1264 goto done_deref_locked; 1265 } 1266 if (ip4s > 1) { 1267 for (ii = ij = 1; ii < ip4s; ii++) { 1268 if (ip4[ii].s_addr == 1269 ppr->pr_ip4[0].s_addr) 1270 continue; 1271 for (; ij < ppr->pr_ip4s; ij++) 1272 if (ip4[ii].s_addr == 1273 ppr->pr_ip4[ij].s_addr) 1274 break; 1275 if (ij == ppr->pr_ip4s) 1276 break; 1277 } 1278 if (ij == ppr->pr_ip4s) { 1279 error = EPERM; 1280 goto done_deref_locked; 1281 } 1282 } 1283 } 1284 } 1285 if (ip4s > 0) { 1286 /* 1287 * Check for conflicting IP addresses. We permit them 1288 * if there is no more than one IP on each jail. If 1289 * there is a duplicate on a jail with more than one 1290 * IP stop checking and return error. 1291 */ 1292 FOREACH_PRISON_DESCENDANT(&prison0, tpr, descend) { 1293 if (tpr == pr || tpr->pr_uref == 0) { 1294 descend = 0; 1295 continue; 1296 } 1297 if (!(tpr->pr_flags & PR_IP4_USER)) 1298 continue; 1299 descend = 0; 1300 if (tpr->pr_ip4 == NULL || 1301 (ip4s == 1 && tpr->pr_ip4s == 1)) 1302 continue; 1303 for (ii = 0; ii < ip4s; ii++) { 1304 if (_prison_check_ip4(tpr, 1305 &ip4[ii]) == 0) { 1306 error = EADDRINUSE; 1307 vfs_opterror(opts, 1308 "IPv4 addresses clash"); 1309 goto done_deref_locked; 1310 } 1311 } 1312 } 1313 } 1314 } 1315 #endif 1316 #ifdef INET6 1317 if (ch_flags & PR_IP6_USER) { 1318 if (ppr->pr_flags & PR_IP6) { 1319 if (!(pr_flags & PR_IP6_USER)) { 1320 /* 1321 * Silently ignore attempts to make the IP 1322 * addresses unrestricted when the parent is 1323 * restricted. 1324 */ 1325 ip6s = ppr->pr_ip6s; 1326 if (ip6s == 0) { 1327 free(ip6, M_PRISON); 1328 ip6 = NULL; 1329 } else if (ip6s <= ip6a) { 1330 /* Inherit the parent's address(es). */ 1331 bcopy(ppr->pr_ip6, ip6, 1332 ip6s * sizeof(*ip6)); 1333 } else { 1334 /* 1335 * There's no room for the parent's 1336 * address list. 1337 */ 1338 ip6a = ip6s; 1339 free(ip6, M_PRISON); 1340 ip6 = malloc(ip6a * sizeof(*ip6), 1341 M_PRISON, M_NOWAIT); 1342 if (ip6 != NULL) 1343 bcopy(ppr->pr_ip6, ip6, 1344 ip6s * sizeof(*ip6)); 1345 else { 1346 prison_deref(pr, created 1347 ? PD_LOCKED | 1348 PD_LIST_XLOCKED 1349 : PD_DEREF | PD_LOCKED | 1350 PD_LIST_XLOCKED); 1351 if (root != NULL) { 1352 vfslocked = 1353 VFS_LOCK_GIANT( 1354 root->v_mount); 1355 vrele(root); 1356 VFS_UNLOCK_GIANT( 1357 vfslocked); 1358 } 1359 ip6 = malloc(ip6a * 1360 sizeof(*ip6), M_PRISON, 1361 M_WAITOK); 1362 goto again; 1363 } 1364 } 1365 } else if (ip6s > 0) { 1366 /* 1367 * Make sure the new set of IP addresses is a 1368 * subset of the parent's list. 1369 */ 1370 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1371 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1372 &ppr->pr_ip6[ij])) 1373 break; 1374 if (ij == ppr->pr_ip6s) { 1375 error = EPERM; 1376 goto done_deref_locked; 1377 } 1378 if (ip6s > 1) { 1379 for (ii = ij = 1; ii < ip6s; ii++) { 1380 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1381 &ppr->pr_ip6[0])) 1382 continue; 1383 for (; ij < ppr->pr_ip6s; ij++) 1384 if (IN6_ARE_ADDR_EQUAL( 1385 &ip6[ii], 1386 &ppr->pr_ip6[ij])) 1387 break; 1388 if (ij == ppr->pr_ip6s) 1389 break; 1390 } 1391 if (ij == ppr->pr_ip6s) { 1392 error = EPERM; 1393 goto done_deref_locked; 1394 } 1395 } 1396 } 1397 } 1398 if (ip6s > 0) { 1399 /* Check for conflicting IP addresses. */ 1400 FOREACH_PRISON_DESCENDANT(&prison0, tpr, descend) { 1401 if (tpr == pr || tpr->pr_uref == 0) { 1402 descend = 0; 1403 continue; 1404 } 1405 if (!(tpr->pr_flags & PR_IP6_USER)) 1406 continue; 1407 descend = 0; 1408 if (tpr->pr_ip6 == NULL || 1409 (ip6s == 1 && tpr->pr_ip6s == 1)) 1410 continue; 1411 for (ii = 0; ii < ip6s; ii++) { 1412 if (_prison_check_ip6(tpr, 1413 &ip6[ii]) == 0) { 1414 error = EADDRINUSE; 1415 vfs_opterror(opts, 1416 "IPv6 addresses clash"); 1417 goto done_deref_locked; 1418 } 1419 } 1420 } 1421 } 1422 } 1423 #endif 1424 onamelen = namelen = 0; 1425 if (name != NULL) { 1426 /* Give a default name of the jid. */ 1427 if (name[0] == '\0') 1428 snprintf(name = numbuf, sizeof(numbuf), "%d", jid); 1429 else if (strtoul(name, &p, 10) != jid && *p == '\0') { 1430 error = EINVAL; 1431 vfs_opterror(opts, "name cannot be numeric"); 1432 goto done_deref_locked; 1433 } 1434 /* 1435 * Make sure the name isn't too long for the prison or its 1436 * children. 1437 */ 1438 onamelen = strlen(pr->pr_name); 1439 namelen = strlen(name); 1440 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) { 1441 error = ENAMETOOLONG; 1442 goto done_deref_locked; 1443 } 1444 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1445 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1446 sizeof(pr->pr_name)) { 1447 error = ENAMETOOLONG; 1448 goto done_deref_locked; 1449 } 1450 } 1451 } 1452 if (pr_allow & ~ppr->pr_allow) { 1453 error = EPERM; 1454 goto done_deref_locked; 1455 } 1456 1457 /* Set the parameters of the prison. */ 1458 #ifdef INET 1459 redo_ip4 = 0; 1460 if (ch_flags & PR_IP4_USER) { 1461 if (pr_flags & PR_IP4_USER) { 1462 /* Some restriction set. */ 1463 pr->pr_flags |= PR_IP4; 1464 if (ip4s >= 0) { 1465 free(pr->pr_ip4, M_PRISON); 1466 pr->pr_ip4s = ip4s; 1467 pr->pr_ip4 = ip4; 1468 ip4 = NULL; 1469 } 1470 } else if (ppr->pr_flags & PR_IP4) { 1471 /* This restriction cleared, but keep inherited. */ 1472 free(pr->pr_ip4, M_PRISON); 1473 pr->pr_ip4s = ip4s; 1474 pr->pr_ip4 = ip4; 1475 ip4 = NULL; 1476 } else { 1477 /* Restriction cleared, now unrestricted. */ 1478 pr->pr_flags &= ~PR_IP4; 1479 free(pr->pr_ip4, M_PRISON); 1480 pr->pr_ip4s = 0; 1481 } 1482 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1483 if (prison_restrict_ip4(tpr, NULL)) { 1484 redo_ip4 = 1; 1485 descend = 0; 1486 } 1487 } 1488 } 1489 #endif 1490 #ifdef INET6 1491 redo_ip6 = 0; 1492 if (ch_flags & PR_IP6_USER) { 1493 if (pr_flags & PR_IP6_USER) { 1494 /* Some restriction set. */ 1495 pr->pr_flags |= PR_IP6; 1496 if (ip6s >= 0) { 1497 free(pr->pr_ip6, M_PRISON); 1498 pr->pr_ip6s = ip6s; 1499 pr->pr_ip6 = ip6; 1500 ip6 = NULL; 1501 } 1502 } else if (ppr->pr_flags & PR_IP6) { 1503 /* This restriction cleared, but keep inherited. */ 1504 free(pr->pr_ip6, M_PRISON); 1505 pr->pr_ip6s = ip6s; 1506 pr->pr_ip6 = ip6; 1507 ip6 = NULL; 1508 } else { 1509 /* Restriction cleared, now unrestricted. */ 1510 pr->pr_flags &= ~PR_IP6; 1511 free(pr->pr_ip6, M_PRISON); 1512 pr->pr_ip6s = 0; 1513 } 1514 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1515 if (prison_restrict_ip6(tpr, NULL)) { 1516 redo_ip6 = 1; 1517 descend = 0; 1518 } 1519 } 1520 } 1521 #endif 1522 if (gotslevel) { 1523 pr->pr_securelevel = slevel; 1524 /* Set all child jails to be at least this level. */ 1525 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1526 if (tpr->pr_securelevel < slevel) 1527 tpr->pr_securelevel = slevel; 1528 } 1529 if (gotchildmax) { 1530 pr->pr_childmax = childmax; 1531 /* Set all child jails to under this limit. */ 1532 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1533 if (tpr->pr_childmax > childmax - level) 1534 tpr->pr_childmax = childmax > level 1535 ? childmax - level : 0; 1536 } 1537 if (gotenforce) { 1538 pr->pr_enforce_statfs = enforce; 1539 /* Pass this restriction on to the children. */ 1540 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1541 if (tpr->pr_enforce_statfs < enforce) 1542 tpr->pr_enforce_statfs = enforce; 1543 } 1544 if (name != NULL) { 1545 if (ppr == &prison0) 1546 strlcpy(pr->pr_name, name, sizeof(pr->pr_name)); 1547 else 1548 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1549 ppr->pr_name, name); 1550 /* Change this component of child names. */ 1551 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1552 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1553 strlen(tpr->pr_name + onamelen) + 1); 1554 bcopy(pr->pr_name, tpr->pr_name, namelen); 1555 } 1556 } 1557 if (path != NULL) { 1558 /* Try to keep a real-rooted full pathname. */ 1559 if (path[0] == '/' && strcmp(mypr->pr_path, "/")) 1560 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1561 mypr->pr_path, path); 1562 else 1563 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1564 pr->pr_root = root; 1565 } 1566 if (PR_HOST & ch_flags & ~pr_flags) { 1567 if (pr->pr_flags & PR_HOST) { 1568 /* 1569 * Copy the parent's host info. As with pr_ip4 above, 1570 * the lack of a lock on the parent is not a problem; 1571 * it is always set with allprison_lock at least 1572 * shared, and is held exclusively here. 1573 */ 1574 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1575 sizeof(pr->pr_hostname)); 1576 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1577 sizeof(pr->pr_domainname)); 1578 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1579 sizeof(pr->pr_hostuuid)); 1580 pr->pr_hostid = pr->pr_parent->pr_hostid; 1581 } 1582 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1583 /* Set this prison, and any descendants without PR_HOST. */ 1584 if (host != NULL) 1585 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1586 if (domain != NULL) 1587 strlcpy(pr->pr_domainname, domain, 1588 sizeof(pr->pr_domainname)); 1589 if (uuid != NULL) 1590 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1591 if (gothid) 1592 pr->pr_hostid = hid; 1593 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1594 if (tpr->pr_flags & PR_HOST) 1595 descend = 0; 1596 else { 1597 if (host != NULL) 1598 strlcpy(tpr->pr_hostname, 1599 pr->pr_hostname, 1600 sizeof(tpr->pr_hostname)); 1601 if (domain != NULL) 1602 strlcpy(tpr->pr_domainname, 1603 pr->pr_domainname, 1604 sizeof(tpr->pr_domainname)); 1605 if (uuid != NULL) 1606 strlcpy(tpr->pr_hostuuid, 1607 pr->pr_hostuuid, 1608 sizeof(tpr->pr_hostuuid)); 1609 if (gothid) 1610 tpr->pr_hostid = hid; 1611 } 1612 } 1613 } 1614 if ((tallow = ch_allow & ~pr_allow)) { 1615 /* Clear allow bits in all children. */ 1616 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1617 tpr->pr_allow &= ~tallow; 1618 } 1619 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1620 /* 1621 * Persistent prisons get an extra reference, and prisons losing their 1622 * persist flag lose that reference. Only do this for existing prisons 1623 * for now, so new ones will remain unseen until after the module 1624 * handlers have completed. 1625 */ 1626 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1627 if (pr_flags & PR_PERSIST) { 1628 pr->pr_ref++; 1629 pr->pr_uref++; 1630 } else { 1631 pr->pr_ref--; 1632 pr->pr_uref--; 1633 } 1634 } 1635 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1636 mtx_unlock(&pr->pr_mtx); 1637 1638 /* Locks may have prevented a complete restriction of child IP 1639 * addresses. If so, allocate some more memory and try again. 1640 */ 1641 #ifdef INET 1642 while (redo_ip4) { 1643 ip4s = pr->pr_ip4s; 1644 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1645 mtx_lock(&pr->pr_mtx); 1646 redo_ip4 = 0; 1647 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1648 if (prison_restrict_ip4(tpr, ip4)) { 1649 if (ip4 != NULL) 1650 ip4 = NULL; 1651 else 1652 redo_ip4 = 1; 1653 } 1654 } 1655 mtx_unlock(&pr->pr_mtx); 1656 } 1657 #endif 1658 #ifdef INET6 1659 while (redo_ip6) { 1660 ip6s = pr->pr_ip6s; 1661 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1662 mtx_lock(&pr->pr_mtx); 1663 redo_ip6 = 0; 1664 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1665 if (prison_restrict_ip6(tpr, ip6)) { 1666 if (ip6 != NULL) 1667 ip6 = NULL; 1668 else 1669 redo_ip6 = 1; 1670 } 1671 } 1672 mtx_unlock(&pr->pr_mtx); 1673 } 1674 #endif 1675 1676 /* Let the modules do their work. */ 1677 sx_downgrade(&allprison_lock); 1678 if (created) { 1679 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1680 if (error) { 1681 prison_deref(pr, PD_LIST_SLOCKED); 1682 goto done_errmsg; 1683 } 1684 } 1685 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1686 if (error) { 1687 prison_deref(pr, created 1688 ? PD_LIST_SLOCKED 1689 : PD_DEREF | PD_LIST_SLOCKED); 1690 goto done_errmsg; 1691 } 1692 1693 /* Attach this process to the prison if requested. */ 1694 if (flags & JAIL_ATTACH) { 1695 mtx_lock(&pr->pr_mtx); 1696 error = do_jail_attach(td, pr); 1697 if (error) { 1698 vfs_opterror(opts, "attach failed"); 1699 if (!created) 1700 prison_deref(pr, PD_DEREF); 1701 goto done_errmsg; 1702 } 1703 } 1704 1705 /* 1706 * Now that it is all there, drop the temporary reference from existing 1707 * prisons. Or add a reference to newly created persistent prisons 1708 * (which was not done earlier so that the prison would not be publicly 1709 * visible). 1710 */ 1711 if (!created) { 1712 prison_deref(pr, (flags & JAIL_ATTACH) 1713 ? PD_DEREF 1714 : PD_DEREF | PD_LIST_SLOCKED); 1715 } else { 1716 if (pr_flags & PR_PERSIST) { 1717 mtx_lock(&pr->pr_mtx); 1718 pr->pr_ref++; 1719 pr->pr_uref++; 1720 mtx_unlock(&pr->pr_mtx); 1721 } 1722 if (!(flags & JAIL_ATTACH)) 1723 sx_sunlock(&allprison_lock); 1724 } 1725 td->td_retval[0] = pr->pr_id; 1726 goto done_errmsg; 1727 1728 done_deref_locked: 1729 prison_deref(pr, created 1730 ? PD_LOCKED | PD_LIST_XLOCKED 1731 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1732 goto done_releroot; 1733 done_unlock_list: 1734 sx_xunlock(&allprison_lock); 1735 done_releroot: 1736 if (root != NULL) { 1737 vfslocked = VFS_LOCK_GIANT(root->v_mount); 1738 vrele(root); 1739 VFS_UNLOCK_GIANT(vfslocked); 1740 } 1741 done_errmsg: 1742 if (error) { 1743 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 1744 if (errmsg_len > 0) { 1745 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1746 if (errmsg_pos > 0) { 1747 if (optuio->uio_segflg == UIO_SYSSPACE) 1748 bcopy(errmsg, 1749 optuio->uio_iov[errmsg_pos].iov_base, 1750 errmsg_len); 1751 else 1752 copyout(errmsg, 1753 optuio->uio_iov[errmsg_pos].iov_base, 1754 errmsg_len); 1755 } 1756 } 1757 } 1758 done_free: 1759 #ifdef INET 1760 free(ip4, M_PRISON); 1761 #endif 1762 #ifdef INET6 1763 free(ip6, M_PRISON); 1764 #endif 1765 vfs_freeopts(opts); 1766 return (error); 1767 } 1768 1769 1770 /* 1771 * struct jail_get_args { 1772 * struct iovec *iovp; 1773 * unsigned int iovcnt; 1774 * int flags; 1775 * }; 1776 */ 1777 int 1778 jail_get(struct thread *td, struct jail_get_args *uap) 1779 { 1780 struct uio *auio; 1781 int error; 1782 1783 /* Check that we have an even number of iovecs. */ 1784 if (uap->iovcnt & 1) 1785 return (EINVAL); 1786 1787 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1788 if (error) 1789 return (error); 1790 error = kern_jail_get(td, auio, uap->flags); 1791 if (error == 0) 1792 error = copyout(auio->uio_iov, uap->iovp, 1793 uap->iovcnt * sizeof (struct iovec)); 1794 free(auio, M_IOV); 1795 return (error); 1796 } 1797 1798 int 1799 kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1800 { 1801 struct prison *pr, *mypr; 1802 struct vfsopt *opt; 1803 struct vfsoptlist *opts; 1804 char *errmsg, *name; 1805 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1806 1807 if (flags & ~JAIL_GET_MASK) 1808 return (EINVAL); 1809 1810 /* Get the parameter list. */ 1811 error = vfs_buildopts(optuio, &opts); 1812 if (error) 1813 return (error); 1814 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1815 mypr = td->td_ucred->cr_prison; 1816 1817 /* 1818 * Find the prison specified by one of: lastjid, jid, name. 1819 */ 1820 sx_slock(&allprison_lock); 1821 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1822 if (error == 0) { 1823 TAILQ_FOREACH(pr, &allprison, pr_list) { 1824 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1825 mtx_lock(&pr->pr_mtx); 1826 if (pr->pr_ref > 0 && 1827 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1828 break; 1829 mtx_unlock(&pr->pr_mtx); 1830 } 1831 } 1832 if (pr != NULL) 1833 goto found_prison; 1834 error = ENOENT; 1835 vfs_opterror(opts, "no jail after %d", jid); 1836 goto done_unlock_list; 1837 } else if (error != ENOENT) 1838 goto done_unlock_list; 1839 1840 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1841 if (error == 0) { 1842 if (jid != 0) { 1843 pr = prison_find_child(mypr, jid); 1844 if (pr != NULL) { 1845 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1846 mtx_unlock(&pr->pr_mtx); 1847 error = ENOENT; 1848 vfs_opterror(opts, "jail %d is dying", 1849 jid); 1850 goto done_unlock_list; 1851 } 1852 goto found_prison; 1853 } 1854 error = ENOENT; 1855 vfs_opterror(opts, "jail %d not found", jid); 1856 goto done_unlock_list; 1857 } 1858 } else if (error != ENOENT) 1859 goto done_unlock_list; 1860 1861 error = vfs_getopt(opts, "name", (void **)&name, &len); 1862 if (error == 0) { 1863 if (len == 0 || name[len - 1] != '\0') { 1864 error = EINVAL; 1865 goto done_unlock_list; 1866 } 1867 pr = prison_find_name(mypr, name); 1868 if (pr != NULL) { 1869 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1870 mtx_unlock(&pr->pr_mtx); 1871 error = ENOENT; 1872 vfs_opterror(opts, "jail \"%s\" is dying", 1873 name); 1874 goto done_unlock_list; 1875 } 1876 goto found_prison; 1877 } 1878 error = ENOENT; 1879 vfs_opterror(opts, "jail \"%s\" not found", name); 1880 goto done_unlock_list; 1881 } else if (error != ENOENT) 1882 goto done_unlock_list; 1883 1884 vfs_opterror(opts, "no jail specified"); 1885 error = ENOENT; 1886 goto done_unlock_list; 1887 1888 found_prison: 1889 /* Get the parameters of the prison. */ 1890 pr->pr_ref++; 1891 locked = PD_LOCKED; 1892 td->td_retval[0] = pr->pr_id; 1893 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 1894 if (error != 0 && error != ENOENT) 1895 goto done_deref; 1896 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 1897 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 1898 if (error != 0 && error != ENOENT) 1899 goto done_deref; 1900 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 1901 if (error != 0 && error != ENOENT) 1902 goto done_deref; 1903 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 1904 sizeof(pr->pr_cpuset->cs_id)); 1905 if (error != 0 && error != ENOENT) 1906 goto done_deref; 1907 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 1908 if (error != 0 && error != ENOENT) 1909 goto done_deref; 1910 #ifdef INET 1911 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 1912 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1913 if (error != 0 && error != ENOENT) 1914 goto done_deref; 1915 #endif 1916 #ifdef INET6 1917 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 1918 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1919 if (error != 0 && error != ENOENT) 1920 goto done_deref; 1921 #endif 1922 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 1923 sizeof(pr->pr_securelevel)); 1924 if (error != 0 && error != ENOENT) 1925 goto done_deref; 1926 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 1927 sizeof(pr->pr_childcount)); 1928 if (error != 0 && error != ENOENT) 1929 goto done_deref; 1930 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 1931 sizeof(pr->pr_childmax)); 1932 if (error != 0 && error != ENOENT) 1933 goto done_deref; 1934 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 1935 if (error != 0 && error != ENOENT) 1936 goto done_deref; 1937 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 1938 if (error != 0 && error != ENOENT) 1939 goto done_deref; 1940 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 1941 if (error != 0 && error != ENOENT) 1942 goto done_deref; 1943 #ifdef COMPAT_IA32 1944 if (td->td_proc->p_sysent->sv_flags & SV_IA32) { 1945 uint32_t hid32 = pr->pr_hostid; 1946 1947 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 1948 } else 1949 #endif 1950 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 1951 sizeof(pr->pr_hostid)); 1952 if (error != 0 && error != ENOENT) 1953 goto done_deref; 1954 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 1955 sizeof(pr->pr_enforce_statfs)); 1956 if (error != 0 && error != ENOENT) 1957 goto done_deref; 1958 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 1959 fi++) { 1960 if (pr_flag_names[fi] == NULL) 1961 continue; 1962 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 1963 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 1964 if (error != 0 && error != ENOENT) 1965 goto done_deref; 1966 i = !i; 1967 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 1968 if (error != 0 && error != ENOENT) 1969 goto done_deref; 1970 } 1971 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 1972 fi++) { 1973 if (pr_allow_names[fi] == NULL) 1974 continue; 1975 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 1976 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 1977 if (error != 0 && error != ENOENT) 1978 goto done_deref; 1979 i = !i; 1980 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 1981 if (error != 0 && error != ENOENT) 1982 goto done_deref; 1983 } 1984 i = (pr->pr_uref == 0); 1985 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 1986 if (error != 0 && error != ENOENT) 1987 goto done_deref; 1988 i = !i; 1989 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 1990 if (error != 0 && error != ENOENT) 1991 goto done_deref; 1992 1993 /* Get the module parameters. */ 1994 mtx_unlock(&pr->pr_mtx); 1995 locked = 0; 1996 error = osd_jail_call(pr, PR_METHOD_GET, opts); 1997 if (error) 1998 goto done_deref; 1999 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2000 2001 /* By now, all parameters should have been noted. */ 2002 TAILQ_FOREACH(opt, opts, link) { 2003 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2004 error = EINVAL; 2005 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2006 goto done_errmsg; 2007 } 2008 } 2009 2010 /* Write the fetched parameters back to userspace. */ 2011 error = 0; 2012 TAILQ_FOREACH(opt, opts, link) { 2013 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2014 pos = 2 * opt->pos + 1; 2015 optuio->uio_iov[pos].iov_len = opt->len; 2016 if (opt->value != NULL) { 2017 if (optuio->uio_segflg == UIO_SYSSPACE) { 2018 bcopy(opt->value, 2019 optuio->uio_iov[pos].iov_base, 2020 opt->len); 2021 } else { 2022 error = copyout(opt->value, 2023 optuio->uio_iov[pos].iov_base, 2024 opt->len); 2025 if (error) 2026 break; 2027 } 2028 } 2029 } 2030 } 2031 goto done_errmsg; 2032 2033 done_deref: 2034 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2035 goto done_errmsg; 2036 2037 done_unlock_list: 2038 sx_sunlock(&allprison_lock); 2039 done_errmsg: 2040 if (error && errmsg_pos >= 0) { 2041 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2042 errmsg_pos = 2 * errmsg_pos + 1; 2043 if (errmsg_len > 0) { 2044 if (optuio->uio_segflg == UIO_SYSSPACE) 2045 bcopy(errmsg, 2046 optuio->uio_iov[errmsg_pos].iov_base, 2047 errmsg_len); 2048 else 2049 copyout(errmsg, 2050 optuio->uio_iov[errmsg_pos].iov_base, 2051 errmsg_len); 2052 } 2053 } 2054 vfs_freeopts(opts); 2055 return (error); 2056 } 2057 2058 2059 /* 2060 * struct jail_remove_args { 2061 * int jid; 2062 * }; 2063 */ 2064 int 2065 jail_remove(struct thread *td, struct jail_remove_args *uap) 2066 { 2067 struct prison *pr, *cpr, *lpr, *tpr; 2068 int descend, error; 2069 2070 error = priv_check(td, PRIV_JAIL_REMOVE); 2071 if (error) 2072 return (error); 2073 2074 sx_xlock(&allprison_lock); 2075 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2076 if (pr == NULL) { 2077 sx_xunlock(&allprison_lock); 2078 return (EINVAL); 2079 } 2080 2081 /* Remove all descendants of this prison, then remove this prison. */ 2082 pr->pr_ref++; 2083 pr->pr_flags |= PR_REMOVE; 2084 if (!LIST_EMPTY(&pr->pr_children)) { 2085 mtx_unlock(&pr->pr_mtx); 2086 lpr = NULL; 2087 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2088 mtx_lock(&cpr->pr_mtx); 2089 if (cpr->pr_ref > 0) { 2090 tpr = cpr; 2091 cpr->pr_ref++; 2092 cpr->pr_flags |= PR_REMOVE; 2093 } else { 2094 /* Already removed - do not do it again. */ 2095 tpr = NULL; 2096 } 2097 mtx_unlock(&cpr->pr_mtx); 2098 if (lpr != NULL) { 2099 mtx_lock(&lpr->pr_mtx); 2100 prison_remove_one(lpr); 2101 sx_xlock(&allprison_lock); 2102 } 2103 lpr = tpr; 2104 } 2105 if (lpr != NULL) { 2106 mtx_lock(&lpr->pr_mtx); 2107 prison_remove_one(lpr); 2108 sx_xlock(&allprison_lock); 2109 } 2110 mtx_lock(&pr->pr_mtx); 2111 } 2112 prison_remove_one(pr); 2113 return (0); 2114 } 2115 2116 static void 2117 prison_remove_one(struct prison *pr) 2118 { 2119 struct proc *p; 2120 int deuref; 2121 2122 /* If the prison was persistent, it is not anymore. */ 2123 deuref = 0; 2124 if (pr->pr_flags & PR_PERSIST) { 2125 pr->pr_ref--; 2126 deuref = PD_DEUREF; 2127 pr->pr_flags &= ~PR_PERSIST; 2128 } 2129 2130 /* 2131 * jail_remove added a reference. If that's the only one, remove 2132 * the prison now. 2133 */ 2134 KASSERT(pr->pr_ref > 0, 2135 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2136 if (pr->pr_ref == 1) { 2137 prison_deref(pr, 2138 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2139 return; 2140 } 2141 2142 mtx_unlock(&pr->pr_mtx); 2143 sx_xunlock(&allprison_lock); 2144 /* 2145 * Kill all processes unfortunate enough to be attached to this prison. 2146 */ 2147 sx_slock(&allproc_lock); 2148 LIST_FOREACH(p, &allproc, p_list) { 2149 PROC_LOCK(p); 2150 if (p->p_state != PRS_NEW && p->p_ucred && 2151 p->p_ucred->cr_prison == pr) 2152 psignal(p, SIGKILL); 2153 PROC_UNLOCK(p); 2154 } 2155 sx_sunlock(&allproc_lock); 2156 /* Remove the temporary reference added by jail_remove. */ 2157 prison_deref(pr, deuref | PD_DEREF); 2158 } 2159 2160 2161 /* 2162 * struct jail_attach_args { 2163 * int jid; 2164 * }; 2165 */ 2166 int 2167 jail_attach(struct thread *td, struct jail_attach_args *uap) 2168 { 2169 struct prison *pr; 2170 int error; 2171 2172 error = priv_check(td, PRIV_JAIL_ATTACH); 2173 if (error) 2174 return (error); 2175 2176 sx_slock(&allprison_lock); 2177 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2178 if (pr == NULL) { 2179 sx_sunlock(&allprison_lock); 2180 return (EINVAL); 2181 } 2182 2183 /* 2184 * Do not allow a process to attach to a prison that is not 2185 * considered to be "alive". 2186 */ 2187 if (pr->pr_uref == 0) { 2188 mtx_unlock(&pr->pr_mtx); 2189 sx_sunlock(&allprison_lock); 2190 return (EINVAL); 2191 } 2192 2193 return (do_jail_attach(td, pr)); 2194 } 2195 2196 static int 2197 do_jail_attach(struct thread *td, struct prison *pr) 2198 { 2199 struct prison *ppr; 2200 struct proc *p; 2201 struct ucred *newcred, *oldcred; 2202 int vfslocked, error; 2203 2204 /* 2205 * XXX: Note that there is a slight race here if two threads 2206 * in the same privileged process attempt to attach to two 2207 * different jails at the same time. It is important for 2208 * user processes not to do this, or they might end up with 2209 * a process root from one prison, but attached to the jail 2210 * of another. 2211 */ 2212 pr->pr_ref++; 2213 pr->pr_uref++; 2214 mtx_unlock(&pr->pr_mtx); 2215 2216 /* Let modules do whatever they need to prepare for attaching. */ 2217 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2218 if (error) { 2219 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2220 return (error); 2221 } 2222 sx_sunlock(&allprison_lock); 2223 2224 /* 2225 * Reparent the newly attached process to this jail. 2226 */ 2227 ppr = td->td_ucred->cr_prison; 2228 p = td->td_proc; 2229 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2230 if (error) 2231 goto e_revert_osd; 2232 2233 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount); 2234 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2235 if ((error = change_dir(pr->pr_root, td)) != 0) 2236 goto e_unlock; 2237 #ifdef MAC 2238 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2239 goto e_unlock; 2240 #endif 2241 VOP_UNLOCK(pr->pr_root, 0); 2242 if ((error = change_root(pr->pr_root, td))) 2243 goto e_unlock_giant; 2244 VFS_UNLOCK_GIANT(vfslocked); 2245 2246 newcred = crget(); 2247 PROC_LOCK(p); 2248 oldcred = p->p_ucred; 2249 setsugid(p); 2250 crcopy(newcred, oldcred); 2251 newcred->cr_prison = pr; 2252 p->p_ucred = newcred; 2253 PROC_UNLOCK(p); 2254 crfree(oldcred); 2255 prison_deref(ppr, PD_DEREF | PD_DEUREF); 2256 return (0); 2257 e_unlock: 2258 VOP_UNLOCK(pr->pr_root, 0); 2259 e_unlock_giant: 2260 VFS_UNLOCK_GIANT(vfslocked); 2261 e_revert_osd: 2262 /* Tell modules this thread is still in its old jail after all. */ 2263 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td); 2264 prison_deref(pr, PD_DEREF | PD_DEUREF); 2265 return (error); 2266 } 2267 2268 2269 /* 2270 * Returns a locked prison instance, or NULL on failure. 2271 */ 2272 struct prison * 2273 prison_find(int prid) 2274 { 2275 struct prison *pr; 2276 2277 sx_assert(&allprison_lock, SX_LOCKED); 2278 TAILQ_FOREACH(pr, &allprison, pr_list) { 2279 if (pr->pr_id == prid) { 2280 mtx_lock(&pr->pr_mtx); 2281 if (pr->pr_ref > 0) 2282 return (pr); 2283 mtx_unlock(&pr->pr_mtx); 2284 } 2285 } 2286 return (NULL); 2287 } 2288 2289 /* 2290 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2291 */ 2292 struct prison * 2293 prison_find_child(struct prison *mypr, int prid) 2294 { 2295 struct prison *pr; 2296 int descend; 2297 2298 sx_assert(&allprison_lock, SX_LOCKED); 2299 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2300 if (pr->pr_id == prid) { 2301 mtx_lock(&pr->pr_mtx); 2302 if (pr->pr_ref > 0) 2303 return (pr); 2304 mtx_unlock(&pr->pr_mtx); 2305 } 2306 } 2307 return (NULL); 2308 } 2309 2310 /* 2311 * Look for the name relative to mypr. Returns a locked prison or NULL. 2312 */ 2313 struct prison * 2314 prison_find_name(struct prison *mypr, const char *name) 2315 { 2316 struct prison *pr, *deadpr; 2317 size_t mylen; 2318 int descend; 2319 2320 sx_assert(&allprison_lock, SX_LOCKED); 2321 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2322 again: 2323 deadpr = NULL; 2324 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2325 if (!strcmp(pr->pr_name + mylen, name)) { 2326 mtx_lock(&pr->pr_mtx); 2327 if (pr->pr_ref > 0) { 2328 if (pr->pr_uref > 0) 2329 return (pr); 2330 deadpr = pr; 2331 } 2332 mtx_unlock(&pr->pr_mtx); 2333 } 2334 } 2335 /* There was no valid prison - perhaps there was a dying one. */ 2336 if (deadpr != NULL) { 2337 mtx_lock(&deadpr->pr_mtx); 2338 if (deadpr->pr_ref == 0) { 2339 mtx_unlock(&deadpr->pr_mtx); 2340 goto again; 2341 } 2342 } 2343 return (deadpr); 2344 } 2345 2346 /* 2347 * See if a prison has the specific flag set. 2348 */ 2349 int 2350 prison_flag(struct ucred *cred, unsigned flag) 2351 { 2352 2353 /* This is an atomic read, so no locking is necessary. */ 2354 return (cred->cr_prison->pr_flags & flag); 2355 } 2356 2357 int 2358 prison_allow(struct ucred *cred, unsigned flag) 2359 { 2360 2361 /* This is an atomic read, so no locking is necessary. */ 2362 return (cred->cr_prison->pr_allow & flag); 2363 } 2364 2365 /* 2366 * Remove a prison reference. If that was the last reference, remove the 2367 * prison itself - but not in this context in case there are locks held. 2368 */ 2369 void 2370 prison_free_locked(struct prison *pr) 2371 { 2372 2373 mtx_assert(&pr->pr_mtx, MA_OWNED); 2374 pr->pr_ref--; 2375 if (pr->pr_ref == 0) { 2376 mtx_unlock(&pr->pr_mtx); 2377 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 2378 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2379 return; 2380 } 2381 mtx_unlock(&pr->pr_mtx); 2382 } 2383 2384 void 2385 prison_free(struct prison *pr) 2386 { 2387 2388 mtx_lock(&pr->pr_mtx); 2389 prison_free_locked(pr); 2390 } 2391 2392 static void 2393 prison_complete(void *context, int pending) 2394 { 2395 2396 prison_deref((struct prison *)context, 0); 2397 } 2398 2399 /* 2400 * Remove a prison reference (usually). This internal version assumes no 2401 * mutexes are held, except perhaps the prison itself. If there are no more 2402 * references, release and delist the prison. On completion, the prison lock 2403 * and the allprison lock are both unlocked. 2404 */ 2405 static void 2406 prison_deref(struct prison *pr, int flags) 2407 { 2408 struct prison *ppr, *tpr; 2409 int vfslocked; 2410 2411 if (!(flags & PD_LOCKED)) 2412 mtx_lock(&pr->pr_mtx); 2413 /* Decrement the user references in a separate loop. */ 2414 if (flags & PD_DEUREF) { 2415 for (tpr = pr;; tpr = tpr->pr_parent) { 2416 if (tpr != pr) 2417 mtx_lock(&tpr->pr_mtx); 2418 if (--tpr->pr_uref > 0) 2419 break; 2420 KASSERT(tpr != &prison0, ("prison0 pr_uref=0")); 2421 mtx_unlock(&tpr->pr_mtx); 2422 } 2423 /* Done if there were only user references to remove. */ 2424 if (!(flags & PD_DEREF)) { 2425 mtx_unlock(&tpr->pr_mtx); 2426 if (flags & PD_LIST_SLOCKED) 2427 sx_sunlock(&allprison_lock); 2428 else if (flags & PD_LIST_XLOCKED) 2429 sx_xunlock(&allprison_lock); 2430 return; 2431 } 2432 if (tpr != pr) { 2433 mtx_unlock(&tpr->pr_mtx); 2434 mtx_lock(&pr->pr_mtx); 2435 } 2436 } 2437 2438 for (;;) { 2439 if (flags & PD_DEREF) 2440 pr->pr_ref--; 2441 /* If the prison still has references, nothing else to do. */ 2442 if (pr->pr_ref > 0) { 2443 mtx_unlock(&pr->pr_mtx); 2444 if (flags & PD_LIST_SLOCKED) 2445 sx_sunlock(&allprison_lock); 2446 else if (flags & PD_LIST_XLOCKED) 2447 sx_xunlock(&allprison_lock); 2448 return; 2449 } 2450 2451 mtx_unlock(&pr->pr_mtx); 2452 if (flags & PD_LIST_SLOCKED) { 2453 if (!sx_try_upgrade(&allprison_lock)) { 2454 sx_sunlock(&allprison_lock); 2455 sx_xlock(&allprison_lock); 2456 } 2457 } else if (!(flags & PD_LIST_XLOCKED)) 2458 sx_xlock(&allprison_lock); 2459 2460 TAILQ_REMOVE(&allprison, pr, pr_list); 2461 LIST_REMOVE(pr, pr_sibling); 2462 ppr = pr->pr_parent; 2463 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2464 tpr->pr_childcount--; 2465 sx_downgrade(&allprison_lock); 2466 2467 #ifdef VIMAGE 2468 if (pr->pr_flags & PR_VNET) 2469 vnet_destroy(pr->pr_vnet); 2470 #endif 2471 if (pr->pr_root != NULL) { 2472 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount); 2473 vrele(pr->pr_root); 2474 VFS_UNLOCK_GIANT(vfslocked); 2475 } 2476 mtx_destroy(&pr->pr_mtx); 2477 #ifdef INET 2478 free(pr->pr_ip4, M_PRISON); 2479 #endif 2480 #ifdef INET6 2481 free(pr->pr_ip6, M_PRISON); 2482 #endif 2483 if (pr->pr_cpuset != NULL) 2484 cpuset_rel(pr->pr_cpuset); 2485 osd_jail_exit(pr); 2486 free(pr, M_PRISON); 2487 2488 /* Removing a prison frees a reference on its parent. */ 2489 pr = ppr; 2490 mtx_lock(&pr->pr_mtx); 2491 flags = PD_DEREF | PD_LIST_SLOCKED; 2492 } 2493 } 2494 2495 void 2496 prison_hold_locked(struct prison *pr) 2497 { 2498 2499 mtx_assert(&pr->pr_mtx, MA_OWNED); 2500 KASSERT(pr->pr_ref > 0, 2501 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2502 pr->pr_ref++; 2503 } 2504 2505 void 2506 prison_hold(struct prison *pr) 2507 { 2508 2509 mtx_lock(&pr->pr_mtx); 2510 prison_hold_locked(pr); 2511 mtx_unlock(&pr->pr_mtx); 2512 } 2513 2514 void 2515 prison_proc_hold(struct prison *pr) 2516 { 2517 2518 mtx_lock(&pr->pr_mtx); 2519 KASSERT(pr->pr_uref > 0, 2520 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2521 pr->pr_uref++; 2522 mtx_unlock(&pr->pr_mtx); 2523 } 2524 2525 void 2526 prison_proc_free(struct prison *pr) 2527 { 2528 2529 mtx_lock(&pr->pr_mtx); 2530 KASSERT(pr->pr_uref > 0, 2531 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2532 prison_deref(pr, PD_DEUREF | PD_LOCKED); 2533 } 2534 2535 2536 #ifdef INET 2537 /* 2538 * Restrict a prison's IP address list with its parent's, possibly replacing 2539 * it. Return true if the replacement buffer was used (or would have been). 2540 */ 2541 static int 2542 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2543 { 2544 int ii, ij, used; 2545 struct prison *ppr; 2546 2547 ppr = pr->pr_parent; 2548 if (!(pr->pr_flags & PR_IP4_USER)) { 2549 /* This has no user settings, so just copy the parent's list. */ 2550 if (pr->pr_ip4s < ppr->pr_ip4s) { 2551 /* 2552 * There's no room for the parent's list. Use the 2553 * new list buffer, which is assumed to be big enough 2554 * (if it was passed). If there's no buffer, try to 2555 * allocate one. 2556 */ 2557 used = 1; 2558 if (newip4 == NULL) { 2559 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2560 M_PRISON, M_NOWAIT); 2561 if (newip4 != NULL) 2562 used = 0; 2563 } 2564 if (newip4 != NULL) { 2565 bcopy(ppr->pr_ip4, newip4, 2566 ppr->pr_ip4s * sizeof(*newip4)); 2567 free(pr->pr_ip4, M_PRISON); 2568 pr->pr_ip4 = newip4; 2569 pr->pr_ip4s = ppr->pr_ip4s; 2570 pr->pr_flags |= PR_IP4; 2571 } 2572 return (used); 2573 } 2574 pr->pr_ip4s = ppr->pr_ip4s; 2575 if (pr->pr_ip4s > 0) 2576 bcopy(ppr->pr_ip4, pr->pr_ip4, 2577 pr->pr_ip4s * sizeof(*newip4)); 2578 else if (pr->pr_ip4 != NULL) { 2579 free(pr->pr_ip4, M_PRISON); 2580 pr->pr_ip4 = NULL; 2581 } 2582 pr->pr_flags = 2583 (pr->pr_flags & ~PR_IP4) | (ppr->pr_flags & PR_IP4); 2584 } else if (pr->pr_ip4s > 0 && (ppr->pr_flags & PR_IP4)) { 2585 /* Remove addresses that aren't in the parent. */ 2586 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2587 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2588 break; 2589 if (ij < ppr->pr_ip4s) 2590 ii = 1; 2591 else { 2592 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2593 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2594 ii = 0; 2595 } 2596 for (ij = 1; ii < pr->pr_ip4s; ) { 2597 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2598 ii++; 2599 continue; 2600 } 2601 switch (ij >= ppr->pr_ip4s ? -1 : 2602 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2603 case -1: 2604 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2605 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2606 break; 2607 case 0: 2608 ii++; 2609 ij++; 2610 break; 2611 case 1: 2612 ij++; 2613 break; 2614 } 2615 } 2616 if (pr->pr_ip4s == 0) { 2617 free(pr->pr_ip4, M_PRISON); 2618 pr->pr_ip4 = NULL; 2619 } 2620 } 2621 return (0); 2622 } 2623 2624 /* 2625 * Pass back primary IPv4 address of this jail. 2626 * 2627 * If not restricted return success but do not alter the address. Caller has 2628 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2629 * 2630 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2631 * Address returned in NBO. 2632 */ 2633 int 2634 prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2635 { 2636 struct prison *pr; 2637 2638 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2639 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2640 2641 pr = cred->cr_prison; 2642 if (!(pr->pr_flags & PR_IP4)) 2643 return (0); 2644 mtx_lock(&pr->pr_mtx); 2645 if (!(pr->pr_flags & PR_IP4)) { 2646 mtx_unlock(&pr->pr_mtx); 2647 return (0); 2648 } 2649 if (pr->pr_ip4 == NULL) { 2650 mtx_unlock(&pr->pr_mtx); 2651 return (EAFNOSUPPORT); 2652 } 2653 2654 ia->s_addr = pr->pr_ip4[0].s_addr; 2655 mtx_unlock(&pr->pr_mtx); 2656 return (0); 2657 } 2658 2659 /* 2660 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2661 */ 2662 int 2663 prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2664 { 2665 2666 if (pr1 == pr2) 2667 return (1); 2668 2669 /* 2670 * jail_set maintains an exclusive hold on allprison_lock while it 2671 * changes the IP addresses, so only a shared hold is needed. This is 2672 * easier than locking the two prisons which would require finding the 2673 * proper locking order and end up needing allprison_lock anyway. 2674 */ 2675 sx_slock(&allprison_lock); 2676 while (pr1 != &prison0 && !(pr1->pr_flags & PR_IP4_USER)) 2677 pr1 = pr1->pr_parent; 2678 while (pr2 != &prison0 && !(pr2->pr_flags & PR_IP4_USER)) 2679 pr2 = pr2->pr_parent; 2680 sx_sunlock(&allprison_lock); 2681 return (pr1 == pr2); 2682 } 2683 2684 /* 2685 * Make sure our (source) address is set to something meaningful to this 2686 * jail. 2687 * 2688 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2689 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2690 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2691 */ 2692 int 2693 prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2694 { 2695 struct prison *pr; 2696 struct in_addr ia0; 2697 int error; 2698 2699 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2700 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2701 2702 pr = cred->cr_prison; 2703 if (!(pr->pr_flags & PR_IP4)) 2704 return (0); 2705 mtx_lock(&pr->pr_mtx); 2706 if (!(pr->pr_flags & PR_IP4)) { 2707 mtx_unlock(&pr->pr_mtx); 2708 return (0); 2709 } 2710 if (pr->pr_ip4 == NULL) { 2711 mtx_unlock(&pr->pr_mtx); 2712 return (EAFNOSUPPORT); 2713 } 2714 2715 ia0.s_addr = ntohl(ia->s_addr); 2716 if (ia0.s_addr == INADDR_LOOPBACK) { 2717 ia->s_addr = pr->pr_ip4[0].s_addr; 2718 mtx_unlock(&pr->pr_mtx); 2719 return (0); 2720 } 2721 2722 if (ia0.s_addr == INADDR_ANY) { 2723 /* 2724 * In case there is only 1 IPv4 address, bind directly. 2725 */ 2726 if (pr->pr_ip4s == 1) 2727 ia->s_addr = pr->pr_ip4[0].s_addr; 2728 mtx_unlock(&pr->pr_mtx); 2729 return (0); 2730 } 2731 2732 error = _prison_check_ip4(pr, ia); 2733 mtx_unlock(&pr->pr_mtx); 2734 return (error); 2735 } 2736 2737 /* 2738 * Rewrite destination address in case we will connect to loopback address. 2739 * 2740 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2741 * Address passed in in NBO and returned in NBO. 2742 */ 2743 int 2744 prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 2745 { 2746 struct prison *pr; 2747 2748 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2749 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2750 2751 pr = cred->cr_prison; 2752 if (!(pr->pr_flags & PR_IP4)) 2753 return (0); 2754 mtx_lock(&pr->pr_mtx); 2755 if (!(pr->pr_flags & PR_IP4)) { 2756 mtx_unlock(&pr->pr_mtx); 2757 return (0); 2758 } 2759 if (pr->pr_ip4 == NULL) { 2760 mtx_unlock(&pr->pr_mtx); 2761 return (EAFNOSUPPORT); 2762 } 2763 2764 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 2765 ia->s_addr = pr->pr_ip4[0].s_addr; 2766 mtx_unlock(&pr->pr_mtx); 2767 return (0); 2768 } 2769 2770 /* 2771 * Return success because nothing had to be changed. 2772 */ 2773 mtx_unlock(&pr->pr_mtx); 2774 return (0); 2775 } 2776 2777 /* 2778 * Check if given address belongs to the jail referenced by cred/prison. 2779 * 2780 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2781 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2782 * doesn't allow IPv4. Address passed in in NBO. 2783 */ 2784 static int 2785 _prison_check_ip4(struct prison *pr, struct in_addr *ia) 2786 { 2787 int i, a, z, d; 2788 2789 /* 2790 * Check the primary IP. 2791 */ 2792 if (pr->pr_ip4[0].s_addr == ia->s_addr) 2793 return (0); 2794 2795 /* 2796 * All the other IPs are sorted so we can do a binary search. 2797 */ 2798 a = 0; 2799 z = pr->pr_ip4s - 2; 2800 while (a <= z) { 2801 i = (a + z) / 2; 2802 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 2803 if (d > 0) 2804 z = i - 1; 2805 else if (d < 0) 2806 a = i + 1; 2807 else 2808 return (0); 2809 } 2810 2811 return (EADDRNOTAVAIL); 2812 } 2813 2814 int 2815 prison_check_ip4(struct ucred *cred, struct in_addr *ia) 2816 { 2817 struct prison *pr; 2818 int error; 2819 2820 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2821 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2822 2823 pr = cred->cr_prison; 2824 if (!(pr->pr_flags & PR_IP4)) 2825 return (0); 2826 mtx_lock(&pr->pr_mtx); 2827 if (!(pr->pr_flags & PR_IP4)) { 2828 mtx_unlock(&pr->pr_mtx); 2829 return (0); 2830 } 2831 if (pr->pr_ip4 == NULL) { 2832 mtx_unlock(&pr->pr_mtx); 2833 return (EAFNOSUPPORT); 2834 } 2835 2836 error = _prison_check_ip4(pr, ia); 2837 mtx_unlock(&pr->pr_mtx); 2838 return (error); 2839 } 2840 #endif 2841 2842 #ifdef INET6 2843 static int 2844 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 2845 { 2846 int ii, ij, used; 2847 struct prison *ppr; 2848 2849 ppr = pr->pr_parent; 2850 if (!(pr->pr_flags & PR_IP6_USER)) { 2851 /* This has no user settings, so just copy the parent's list. */ 2852 if (pr->pr_ip6s < ppr->pr_ip6s) { 2853 /* 2854 * There's no room for the parent's list. Use the 2855 * new list buffer, which is assumed to be big enough 2856 * (if it was passed). If there's no buffer, try to 2857 * allocate one. 2858 */ 2859 used = 1; 2860 if (newip6 == NULL) { 2861 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 2862 M_PRISON, M_NOWAIT); 2863 if (newip6 != NULL) 2864 used = 0; 2865 } 2866 if (newip6 != NULL) { 2867 bcopy(ppr->pr_ip6, newip6, 2868 ppr->pr_ip6s * sizeof(*newip6)); 2869 free(pr->pr_ip6, M_PRISON); 2870 pr->pr_ip6 = newip6; 2871 pr->pr_ip6s = ppr->pr_ip6s; 2872 pr->pr_flags |= PR_IP6; 2873 } 2874 return (used); 2875 } 2876 pr->pr_ip6s = ppr->pr_ip6s; 2877 if (pr->pr_ip6s > 0) 2878 bcopy(ppr->pr_ip6, pr->pr_ip6, 2879 pr->pr_ip6s * sizeof(*newip6)); 2880 else if (pr->pr_ip6 != NULL) { 2881 free(pr->pr_ip6, M_PRISON); 2882 pr->pr_ip6 = NULL; 2883 } 2884 pr->pr_flags = 2885 (pr->pr_flags & ~PR_IP6) | (ppr->pr_flags & PR_IP6); 2886 } else if (pr->pr_ip6s > 0 && (ppr->pr_flags & PR_IP6)) { 2887 /* Remove addresses that aren't in the parent. */ 2888 for (ij = 0; ij < ppr->pr_ip6s; ij++) 2889 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 2890 &ppr->pr_ip6[ij])) 2891 break; 2892 if (ij < ppr->pr_ip6s) 2893 ii = 1; 2894 else { 2895 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 2896 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2897 ii = 0; 2898 } 2899 for (ij = 1; ii < pr->pr_ip6s; ) { 2900 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 2901 &ppr->pr_ip6[0])) { 2902 ii++; 2903 continue; 2904 } 2905 switch (ij >= ppr->pr_ip4s ? -1 : 2906 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 2907 case -1: 2908 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 2909 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 2910 break; 2911 case 0: 2912 ii++; 2913 ij++; 2914 break; 2915 case 1: 2916 ij++; 2917 break; 2918 } 2919 } 2920 if (pr->pr_ip6s == 0) { 2921 free(pr->pr_ip6, M_PRISON); 2922 pr->pr_ip6 = NULL; 2923 } 2924 } 2925 return 0; 2926 } 2927 2928 /* 2929 * Pass back primary IPv6 address for this jail. 2930 * 2931 * If not restricted return success but do not alter the address. Caller has 2932 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 2933 * 2934 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 2935 */ 2936 int 2937 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 2938 { 2939 struct prison *pr; 2940 2941 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2942 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 2943 2944 pr = cred->cr_prison; 2945 if (!(pr->pr_flags & PR_IP6)) 2946 return (0); 2947 mtx_lock(&pr->pr_mtx); 2948 if (!(pr->pr_flags & PR_IP6)) { 2949 mtx_unlock(&pr->pr_mtx); 2950 return (0); 2951 } 2952 if (pr->pr_ip6 == NULL) { 2953 mtx_unlock(&pr->pr_mtx); 2954 return (EAFNOSUPPORT); 2955 } 2956 2957 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 2958 mtx_unlock(&pr->pr_mtx); 2959 return (0); 2960 } 2961 2962 /* 2963 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 2964 */ 2965 int 2966 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 2967 { 2968 2969 if (pr1 == pr2) 2970 return (1); 2971 2972 sx_slock(&allprison_lock); 2973 while (pr1 != &prison0 && !(pr1->pr_flags & PR_IP6_USER)) 2974 pr1 = pr1->pr_parent; 2975 while (pr2 != &prison0 && !(pr2->pr_flags & PR_IP6_USER)) 2976 pr2 = pr2->pr_parent; 2977 sx_sunlock(&allprison_lock); 2978 return (pr1 == pr2); 2979 } 2980 2981 /* 2982 * Make sure our (source) address is set to something meaningful to this jail. 2983 * 2984 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 2985 * when needed while binding. 2986 * 2987 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 2988 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2989 * doesn't allow IPv6. 2990 */ 2991 int 2992 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 2993 { 2994 struct prison *pr; 2995 int error; 2996 2997 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2998 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 2999 3000 pr = cred->cr_prison; 3001 if (!(pr->pr_flags & PR_IP6)) 3002 return (0); 3003 mtx_lock(&pr->pr_mtx); 3004 if (!(pr->pr_flags & PR_IP6)) { 3005 mtx_unlock(&pr->pr_mtx); 3006 return (0); 3007 } 3008 if (pr->pr_ip6 == NULL) { 3009 mtx_unlock(&pr->pr_mtx); 3010 return (EAFNOSUPPORT); 3011 } 3012 3013 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3014 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3015 mtx_unlock(&pr->pr_mtx); 3016 return (0); 3017 } 3018 3019 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3020 /* 3021 * In case there is only 1 IPv6 address, and v6only is true, 3022 * then bind directly. 3023 */ 3024 if (v6only != 0 && pr->pr_ip6s == 1) 3025 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3026 mtx_unlock(&pr->pr_mtx); 3027 return (0); 3028 } 3029 3030 error = _prison_check_ip6(pr, ia6); 3031 mtx_unlock(&pr->pr_mtx); 3032 return (error); 3033 } 3034 3035 /* 3036 * Rewrite destination address in case we will connect to loopback address. 3037 * 3038 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3039 */ 3040 int 3041 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3042 { 3043 struct prison *pr; 3044 3045 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3046 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3047 3048 pr = cred->cr_prison; 3049 if (!(pr->pr_flags & PR_IP6)) 3050 return (0); 3051 mtx_lock(&pr->pr_mtx); 3052 if (!(pr->pr_flags & PR_IP6)) { 3053 mtx_unlock(&pr->pr_mtx); 3054 return (0); 3055 } 3056 if (pr->pr_ip6 == NULL) { 3057 mtx_unlock(&pr->pr_mtx); 3058 return (EAFNOSUPPORT); 3059 } 3060 3061 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3062 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3063 mtx_unlock(&pr->pr_mtx); 3064 return (0); 3065 } 3066 3067 /* 3068 * Return success because nothing had to be changed. 3069 */ 3070 mtx_unlock(&pr->pr_mtx); 3071 return (0); 3072 } 3073 3074 /* 3075 * Check if given address belongs to the jail referenced by cred/prison. 3076 * 3077 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3078 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3079 * doesn't allow IPv6. 3080 */ 3081 static int 3082 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3083 { 3084 int i, a, z, d; 3085 3086 /* 3087 * Check the primary IP. 3088 */ 3089 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3090 return (0); 3091 3092 /* 3093 * All the other IPs are sorted so we can do a binary search. 3094 */ 3095 a = 0; 3096 z = pr->pr_ip6s - 2; 3097 while (a <= z) { 3098 i = (a + z) / 2; 3099 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3100 if (d > 0) 3101 z = i - 1; 3102 else if (d < 0) 3103 a = i + 1; 3104 else 3105 return (0); 3106 } 3107 3108 return (EADDRNOTAVAIL); 3109 } 3110 3111 int 3112 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 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 error = _prison_check_ip6(pr, ia6); 3134 mtx_unlock(&pr->pr_mtx); 3135 return (error); 3136 } 3137 #endif 3138 3139 /* 3140 * Check if a jail supports the given address family. 3141 * 3142 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3143 * if not. 3144 */ 3145 int 3146 prison_check_af(struct ucred *cred, int af) 3147 { 3148 struct prison *pr; 3149 int error; 3150 3151 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3152 3153 pr = cred->cr_prison; 3154 #ifdef VIMAGE 3155 /* Prisons with their own network stack are not limited. */ 3156 if (pr->pr_flags & PR_VNET) 3157 return (0); 3158 #endif 3159 3160 error = 0; 3161 switch (af) 3162 { 3163 #ifdef INET 3164 case AF_INET: 3165 if (pr->pr_flags & PR_IP4) 3166 { 3167 mtx_lock(&pr->pr_mtx); 3168 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3169 error = EAFNOSUPPORT; 3170 mtx_unlock(&pr->pr_mtx); 3171 } 3172 break; 3173 #endif 3174 #ifdef INET6 3175 case AF_INET6: 3176 if (pr->pr_flags & PR_IP6) 3177 { 3178 mtx_lock(&pr->pr_mtx); 3179 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3180 error = EAFNOSUPPORT; 3181 mtx_unlock(&pr->pr_mtx); 3182 } 3183 break; 3184 #endif 3185 case AF_LOCAL: 3186 case AF_ROUTE: 3187 break; 3188 default: 3189 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3190 error = EAFNOSUPPORT; 3191 } 3192 return (error); 3193 } 3194 3195 /* 3196 * Check if given address belongs to the jail referenced by cred (wrapper to 3197 * prison_check_ip[46]). 3198 * 3199 * Returns 0 if jail doesn't restrict the address family or if address belongs 3200 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3201 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3202 */ 3203 int 3204 prison_if(struct ucred *cred, struct sockaddr *sa) 3205 { 3206 #ifdef INET 3207 struct sockaddr_in *sai; 3208 #endif 3209 #ifdef INET6 3210 struct sockaddr_in6 *sai6; 3211 #endif 3212 int error; 3213 3214 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3215 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3216 3217 error = 0; 3218 switch (sa->sa_family) 3219 { 3220 #ifdef INET 3221 case AF_INET: 3222 sai = (struct sockaddr_in *)sa; 3223 error = prison_check_ip4(cred, &sai->sin_addr); 3224 break; 3225 #endif 3226 #ifdef INET6 3227 case AF_INET6: 3228 sai6 = (struct sockaddr_in6 *)sa; 3229 error = prison_check_ip6(cred, &sai6->sin6_addr); 3230 break; 3231 #endif 3232 default: 3233 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3234 error = EAFNOSUPPORT; 3235 } 3236 return (error); 3237 } 3238 3239 /* 3240 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3241 */ 3242 int 3243 prison_check(struct ucred *cred1, struct ucred *cred2) 3244 { 3245 3246 #ifdef VIMAGE 3247 if (cred2->cr_vimage->v_procg != cred1->cr_vimage->v_procg) 3248 return (ESRCH); 3249 #endif 3250 return ((cred1->cr_prison == cred2->cr_prison || 3251 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3252 } 3253 3254 /* 3255 * Return 1 if p2 is a child of p1, otherwise 0. 3256 */ 3257 int 3258 prison_ischild(struct prison *pr1, struct prison *pr2) 3259 { 3260 3261 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3262 if (pr1 == pr2) 3263 return (1); 3264 return (0); 3265 } 3266 3267 /* 3268 * Return 1 if the passed credential is in a jail, otherwise 0. 3269 */ 3270 int 3271 jailed(struct ucred *cred) 3272 { 3273 3274 return (cred->cr_prison != &prison0); 3275 } 3276 3277 /* 3278 * Return the correct hostname (domainname, et al) for the passed credential. 3279 */ 3280 void 3281 getcredhostname(struct ucred *cred, char *buf, size_t size) 3282 { 3283 struct prison *pr; 3284 3285 /* 3286 * A NULL credential can be used to shortcut to the physical 3287 * system's hostname. 3288 */ 3289 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3290 mtx_lock(&pr->pr_mtx); 3291 strlcpy(buf, pr->pr_hostname, size); 3292 mtx_unlock(&pr->pr_mtx); 3293 } 3294 3295 void 3296 getcreddomainname(struct ucred *cred, char *buf, size_t size) 3297 { 3298 3299 mtx_lock(&cred->cr_prison->pr_mtx); 3300 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3301 mtx_unlock(&cred->cr_prison->pr_mtx); 3302 } 3303 3304 void 3305 getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3306 { 3307 3308 mtx_lock(&cred->cr_prison->pr_mtx); 3309 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3310 mtx_unlock(&cred->cr_prison->pr_mtx); 3311 } 3312 3313 void 3314 getcredhostid(struct ucred *cred, unsigned long *hostid) 3315 { 3316 3317 mtx_lock(&cred->cr_prison->pr_mtx); 3318 *hostid = cred->cr_prison->pr_hostid; 3319 mtx_unlock(&cred->cr_prison->pr_mtx); 3320 } 3321 3322 /* 3323 * Determine whether the subject represented by cred can "see" 3324 * status of a mount point. 3325 * Returns: 0 for permitted, ENOENT otherwise. 3326 * XXX: This function should be called cr_canseemount() and should be 3327 * placed in kern_prot.c. 3328 */ 3329 int 3330 prison_canseemount(struct ucred *cred, struct mount *mp) 3331 { 3332 struct prison *pr; 3333 struct statfs *sp; 3334 size_t len; 3335 3336 pr = cred->cr_prison; 3337 if (pr->pr_enforce_statfs == 0) 3338 return (0); 3339 if (pr->pr_root->v_mount == mp) 3340 return (0); 3341 if (pr->pr_enforce_statfs == 2) 3342 return (ENOENT); 3343 /* 3344 * If jail's chroot directory is set to "/" we should be able to see 3345 * all mount-points from inside a jail. 3346 * This is ugly check, but this is the only situation when jail's 3347 * directory ends with '/'. 3348 */ 3349 if (strcmp(pr->pr_path, "/") == 0) 3350 return (0); 3351 len = strlen(pr->pr_path); 3352 sp = &mp->mnt_stat; 3353 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3354 return (ENOENT); 3355 /* 3356 * Be sure that we don't have situation where jail's root directory 3357 * is "/some/path" and mount point is "/some/pathpath". 3358 */ 3359 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3360 return (ENOENT); 3361 return (0); 3362 } 3363 3364 void 3365 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3366 { 3367 char jpath[MAXPATHLEN]; 3368 struct prison *pr; 3369 size_t len; 3370 3371 pr = cred->cr_prison; 3372 if (pr->pr_enforce_statfs == 0) 3373 return; 3374 if (prison_canseemount(cred, mp) != 0) { 3375 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3376 strlcpy(sp->f_mntonname, "[restricted]", 3377 sizeof(sp->f_mntonname)); 3378 return; 3379 } 3380 if (pr->pr_root->v_mount == mp) { 3381 /* 3382 * Clear current buffer data, so we are sure nothing from 3383 * the valid path left there. 3384 */ 3385 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3386 *sp->f_mntonname = '/'; 3387 return; 3388 } 3389 /* 3390 * If jail's chroot directory is set to "/" we should be able to see 3391 * all mount-points from inside a jail. 3392 */ 3393 if (strcmp(pr->pr_path, "/") == 0) 3394 return; 3395 len = strlen(pr->pr_path); 3396 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3397 /* 3398 * Clear current buffer data, so we are sure nothing from 3399 * the valid path left there. 3400 */ 3401 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3402 if (*jpath == '\0') { 3403 /* Should never happen. */ 3404 *sp->f_mntonname = '/'; 3405 } else { 3406 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3407 } 3408 } 3409 3410 /* 3411 * Check with permission for a specific privilege is granted within jail. We 3412 * have a specific list of accepted privileges; the rest are denied. 3413 */ 3414 int 3415 prison_priv_check(struct ucred *cred, int priv) 3416 { 3417 3418 if (!jailed(cred)) 3419 return (0); 3420 3421 #ifdef VIMAGE 3422 /* 3423 * Privileges specific to prisons with a virtual network stack. 3424 * There might be a duplicate entry here in case the privilege 3425 * is only granted conditionally in the legacy jail case. 3426 */ 3427 switch (priv) { 3428 #ifdef notyet 3429 /* 3430 * NFS-specific privileges. 3431 */ 3432 case PRIV_NFS_DAEMON: 3433 case PRIV_NFS_LOCKD: 3434 #endif 3435 /* 3436 * Network stack privileges. 3437 */ 3438 case PRIV_NET_BRIDGE: 3439 case PRIV_NET_GRE: 3440 case PRIV_NET_BPF: 3441 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3442 case PRIV_NET_ROUTE: 3443 case PRIV_NET_TAP: 3444 case PRIV_NET_SETIFMTU: 3445 case PRIV_NET_SETIFFLAGS: 3446 case PRIV_NET_SETIFCAP: 3447 case PRIV_NET_SETIFNAME : 3448 case PRIV_NET_SETIFMETRIC: 3449 case PRIV_NET_SETIFPHYS: 3450 case PRIV_NET_SETIFMAC: 3451 case PRIV_NET_ADDMULTI: 3452 case PRIV_NET_DELMULTI: 3453 case PRIV_NET_HWIOCTL: 3454 case PRIV_NET_SETLLADDR: 3455 case PRIV_NET_ADDIFGROUP: 3456 case PRIV_NET_DELIFGROUP: 3457 case PRIV_NET_IFCREATE: 3458 case PRIV_NET_IFDESTROY: 3459 case PRIV_NET_ADDIFADDR: 3460 case PRIV_NET_DELIFADDR: 3461 case PRIV_NET_LAGG: 3462 case PRIV_NET_GIF: 3463 case PRIV_NET_SETIFVNET: 3464 3465 /* 3466 * 802.11-related privileges. 3467 */ 3468 case PRIV_NET80211_GETKEY: 3469 #ifdef notyet 3470 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3471 #endif 3472 3473 #ifdef notyet 3474 /* 3475 * AppleTalk privileges. 3476 */ 3477 case PRIV_NETATALK_RESERVEDPORT: 3478 3479 /* 3480 * ATM privileges. 3481 */ 3482 case PRIV_NETATM_CFG: 3483 case PRIV_NETATM_ADD: 3484 case PRIV_NETATM_DEL: 3485 case PRIV_NETATM_SET: 3486 3487 /* 3488 * Bluetooth privileges. 3489 */ 3490 case PRIV_NETBLUETOOTH_RAW: 3491 #endif 3492 3493 /* 3494 * Netgraph and netgraph module privileges. 3495 */ 3496 case PRIV_NETGRAPH_CONTROL: 3497 #ifdef notyet 3498 case PRIV_NETGRAPH_TTY: 3499 #endif 3500 3501 /* 3502 * IPv4 and IPv6 privileges. 3503 */ 3504 case PRIV_NETINET_IPFW: 3505 case PRIV_NETINET_DIVERT: 3506 case PRIV_NETINET_PF: 3507 case PRIV_NETINET_DUMMYNET: 3508 case PRIV_NETINET_CARP: 3509 case PRIV_NETINET_MROUTE: 3510 case PRIV_NETINET_RAW: 3511 case PRIV_NETINET_ADDRCTRL6: 3512 case PRIV_NETINET_ND6: 3513 case PRIV_NETINET_SCOPE6: 3514 case PRIV_NETINET_ALIFETIME6: 3515 case PRIV_NETINET_IPSEC: 3516 case PRIV_NETINET_BINDANY: 3517 3518 #ifdef notyet 3519 /* 3520 * IPX/SPX privileges. 3521 */ 3522 case PRIV_NETIPX_RESERVEDPORT: 3523 case PRIV_NETIPX_RAW: 3524 3525 /* 3526 * NCP privileges. 3527 */ 3528 case PRIV_NETNCP: 3529 3530 /* 3531 * SMB privileges. 3532 */ 3533 case PRIV_NETSMB: 3534 #endif 3535 3536 /* 3537 * No default: or deny here. 3538 * In case of no permit fall through to next switch(). 3539 */ 3540 if (cred->cr_prison->pr_flags & PR_VNET) 3541 return (0); 3542 } 3543 #endif /* VIMAGE */ 3544 3545 switch (priv) { 3546 3547 /* 3548 * Allow ktrace privileges for root in jail. 3549 */ 3550 case PRIV_KTRACE: 3551 3552 #if 0 3553 /* 3554 * Allow jailed processes to configure audit identity and 3555 * submit audit records (login, etc). In the future we may 3556 * want to further refine the relationship between audit and 3557 * jail. 3558 */ 3559 case PRIV_AUDIT_GETAUDIT: 3560 case PRIV_AUDIT_SETAUDIT: 3561 case PRIV_AUDIT_SUBMIT: 3562 #endif 3563 3564 /* 3565 * Allow jailed processes to manipulate process UNIX 3566 * credentials in any way they see fit. 3567 */ 3568 case PRIV_CRED_SETUID: 3569 case PRIV_CRED_SETEUID: 3570 case PRIV_CRED_SETGID: 3571 case PRIV_CRED_SETEGID: 3572 case PRIV_CRED_SETGROUPS: 3573 case PRIV_CRED_SETREUID: 3574 case PRIV_CRED_SETREGID: 3575 case PRIV_CRED_SETRESUID: 3576 case PRIV_CRED_SETRESGID: 3577 3578 /* 3579 * Jail implements visibility constraints already, so allow 3580 * jailed root to override uid/gid-based constraints. 3581 */ 3582 case PRIV_SEEOTHERGIDS: 3583 case PRIV_SEEOTHERUIDS: 3584 3585 /* 3586 * Jail implements inter-process debugging limits already, so 3587 * allow jailed root various debugging privileges. 3588 */ 3589 case PRIV_DEBUG_DIFFCRED: 3590 case PRIV_DEBUG_SUGID: 3591 case PRIV_DEBUG_UNPRIV: 3592 3593 /* 3594 * Allow jail to set various resource limits and login 3595 * properties, and for now, exceed process resource limits. 3596 */ 3597 case PRIV_PROC_LIMIT: 3598 case PRIV_PROC_SETLOGIN: 3599 case PRIV_PROC_SETRLIMIT: 3600 3601 /* 3602 * System V and POSIX IPC privileges are granted in jail. 3603 */ 3604 case PRIV_IPC_READ: 3605 case PRIV_IPC_WRITE: 3606 case PRIV_IPC_ADMIN: 3607 case PRIV_IPC_MSGSIZE: 3608 case PRIV_MQ_ADMIN: 3609 3610 /* 3611 * Jail operations within a jail work on child jails. 3612 */ 3613 case PRIV_JAIL_ATTACH: 3614 case PRIV_JAIL_SET: 3615 case PRIV_JAIL_REMOVE: 3616 3617 /* 3618 * Jail implements its own inter-process limits, so allow 3619 * root processes in jail to change scheduling on other 3620 * processes in the same jail. Likewise for signalling. 3621 */ 3622 case PRIV_SCHED_DIFFCRED: 3623 case PRIV_SCHED_CPUSET: 3624 case PRIV_SIGNAL_DIFFCRED: 3625 case PRIV_SIGNAL_SUGID: 3626 3627 /* 3628 * Allow jailed processes to write to sysctls marked as jail 3629 * writable. 3630 */ 3631 case PRIV_SYSCTL_WRITEJAIL: 3632 3633 /* 3634 * Allow root in jail to manage a variety of quota 3635 * properties. These should likely be conditional on a 3636 * configuration option. 3637 */ 3638 case PRIV_VFS_GETQUOTA: 3639 case PRIV_VFS_SETQUOTA: 3640 3641 /* 3642 * Since Jail relies on chroot() to implement file system 3643 * protections, grant many VFS privileges to root in jail. 3644 * Be careful to exclude mount-related and NFS-related 3645 * privileges. 3646 */ 3647 case PRIV_VFS_READ: 3648 case PRIV_VFS_WRITE: 3649 case PRIV_VFS_ADMIN: 3650 case PRIV_VFS_EXEC: 3651 case PRIV_VFS_LOOKUP: 3652 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3653 case PRIV_VFS_CHFLAGS_DEV: 3654 case PRIV_VFS_CHOWN: 3655 case PRIV_VFS_CHROOT: 3656 case PRIV_VFS_RETAINSUGID: 3657 case PRIV_VFS_FCHROOT: 3658 case PRIV_VFS_LINK: 3659 case PRIV_VFS_SETGID: 3660 case PRIV_VFS_STAT: 3661 case PRIV_VFS_STICKYFILE: 3662 return (0); 3663 3664 /* 3665 * Depending on the global setting, allow privilege of 3666 * setting system flags. 3667 */ 3668 case PRIV_VFS_SYSFLAGS: 3669 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3670 return (0); 3671 else 3672 return (EPERM); 3673 3674 /* 3675 * Depending on the global setting, allow privilege of 3676 * mounting/unmounting file systems. 3677 */ 3678 case PRIV_VFS_MOUNT: 3679 case PRIV_VFS_UNMOUNT: 3680 case PRIV_VFS_MOUNT_NONUSER: 3681 case PRIV_VFS_MOUNT_OWNER: 3682 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT) 3683 return (0); 3684 else 3685 return (EPERM); 3686 3687 /* 3688 * Allow jailed root to bind reserved ports and reuse in-use 3689 * ports. 3690 */ 3691 case PRIV_NETINET_RESERVEDPORT: 3692 case PRIV_NETINET_REUSEPORT: 3693 return (0); 3694 3695 /* 3696 * Allow jailed root to set certian IPv4/6 (option) headers. 3697 */ 3698 case PRIV_NETINET_SETHDROPTS: 3699 return (0); 3700 3701 /* 3702 * Conditionally allow creating raw sockets in jail. 3703 */ 3704 case PRIV_NETINET_RAW: 3705 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3706 return (0); 3707 else 3708 return (EPERM); 3709 3710 /* 3711 * Since jail implements its own visibility limits on netstat 3712 * sysctls, allow getcred. This allows identd to work in 3713 * jail. 3714 */ 3715 case PRIV_NETINET_GETCRED: 3716 return (0); 3717 3718 default: 3719 /* 3720 * In all remaining cases, deny the privilege request. This 3721 * includes almost all network privileges, many system 3722 * configuration privileges. 3723 */ 3724 return (EPERM); 3725 } 3726 } 3727 3728 /* 3729 * Return the part of pr2's name that is relative to pr1, or the whole name 3730 * if it does not directly follow. 3731 */ 3732 3733 char * 3734 prison_name(struct prison *pr1, struct prison *pr2) 3735 { 3736 char *name; 3737 3738 /* Jails see themselves as "0" (if they see themselves at all). */ 3739 if (pr1 == pr2) 3740 return "0"; 3741 name = pr2->pr_name; 3742 if (prison_ischild(pr1, pr2)) { 3743 /* 3744 * pr1 isn't locked (and allprison_lock may not be either) 3745 * so its length can't be counted on. But the number of dots 3746 * can be counted on - and counted. 3747 */ 3748 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3749 name = strchr(name, '.') + 1; 3750 } 3751 return (name); 3752 } 3753 3754 /* 3755 * Return the part of pr2's path that is relative to pr1, or the whole path 3756 * if it does not directly follow. 3757 */ 3758 static char * 3759 prison_path(struct prison *pr1, struct prison *pr2) 3760 { 3761 char *path1, *path2; 3762 int len1; 3763 3764 path1 = pr1->pr_path; 3765 path2 = pr2->pr_path; 3766 if (!strcmp(path1, "/")) 3767 return (path2); 3768 len1 = strlen(path1); 3769 if (strncmp(path1, path2, len1)) 3770 return (path2); 3771 if (path2[len1] == '\0') 3772 return "/"; 3773 if (path2[len1] == '/') 3774 return (path2 + len1); 3775 return (path2); 3776 } 3777 3778 3779 /* 3780 * Jail-related sysctls. 3781 */ 3782 SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 3783 "Jails"); 3784 3785 static int 3786 sysctl_jail_list(SYSCTL_HANDLER_ARGS) 3787 { 3788 struct xprison *xp; 3789 struct prison *pr, *cpr; 3790 #ifdef INET 3791 struct in_addr *ip4 = NULL; 3792 int ip4s = 0; 3793 #endif 3794 #ifdef INET6 3795 struct in_addr *ip6 = NULL; 3796 int ip6s = 0; 3797 #endif 3798 int descend, error; 3799 3800 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 3801 pr = req->td->td_ucred->cr_prison; 3802 error = 0; 3803 sx_slock(&allprison_lock); 3804 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 3805 #if defined(INET) || defined(INET6) 3806 again: 3807 #endif 3808 mtx_lock(&cpr->pr_mtx); 3809 #ifdef INET 3810 if (cpr->pr_ip4s > 0) { 3811 if (ip4s < cpr->pr_ip4s) { 3812 ip4s = cpr->pr_ip4s; 3813 mtx_unlock(&cpr->pr_mtx); 3814 ip4 = realloc(ip4, ip4s * 3815 sizeof(struct in_addr), M_TEMP, M_WAITOK); 3816 goto again; 3817 } 3818 bcopy(cpr->pr_ip4, ip4, 3819 cpr->pr_ip4s * sizeof(struct in_addr)); 3820 } 3821 #endif 3822 #ifdef INET6 3823 if (cpr->pr_ip6s > 0) { 3824 if (ip6s < cpr->pr_ip6s) { 3825 ip6s = cpr->pr_ip6s; 3826 mtx_unlock(&cpr->pr_mtx); 3827 ip6 = realloc(ip6, ip6s * 3828 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 3829 goto again; 3830 } 3831 bcopy(cpr->pr_ip6, ip6, 3832 cpr->pr_ip6s * sizeof(struct in6_addr)); 3833 } 3834 #endif 3835 if (cpr->pr_ref == 0) { 3836 mtx_unlock(&cpr->pr_mtx); 3837 continue; 3838 } 3839 bzero(xp, sizeof(*xp)); 3840 xp->pr_version = XPRISON_VERSION; 3841 xp->pr_id = cpr->pr_id; 3842 xp->pr_state = cpr->pr_uref > 0 3843 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 3844 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 3845 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 3846 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 3847 #ifdef INET 3848 xp->pr_ip4s = cpr->pr_ip4s; 3849 #endif 3850 #ifdef INET6 3851 xp->pr_ip6s = cpr->pr_ip6s; 3852 #endif 3853 mtx_unlock(&cpr->pr_mtx); 3854 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 3855 if (error) 3856 break; 3857 #ifdef INET 3858 if (xp->pr_ip4s > 0) { 3859 error = SYSCTL_OUT(req, ip4, 3860 xp->pr_ip4s * sizeof(struct in_addr)); 3861 if (error) 3862 break; 3863 } 3864 #endif 3865 #ifdef INET6 3866 if (xp->pr_ip6s > 0) { 3867 error = SYSCTL_OUT(req, ip6, 3868 xp->pr_ip6s * sizeof(struct in6_addr)); 3869 if (error) 3870 break; 3871 } 3872 #endif 3873 } 3874 sx_sunlock(&allprison_lock); 3875 free(xp, M_TEMP); 3876 #ifdef INET 3877 free(ip4, M_TEMP); 3878 #endif 3879 #ifdef INET6 3880 free(ip6, M_TEMP); 3881 #endif 3882 return (error); 3883 } 3884 3885 SYSCTL_OID(_security_jail, OID_AUTO, list, 3886 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3887 sysctl_jail_list, "S", "List of active jails"); 3888 3889 static int 3890 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 3891 { 3892 int error, injail; 3893 3894 injail = jailed(req->td->td_ucred); 3895 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 3896 3897 return (error); 3898 } 3899 3900 SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 3901 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 3902 sysctl_jail_jailed, "I", "Process in jail?"); 3903 3904 #if defined(INET) || defined(INET6) 3905 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 3906 &jail_max_af_ips, 0, 3907 "Number of IP addresses a jail may have at most per address family"); 3908 #endif 3909 3910 /* 3911 * Default parameters for jail(2) compatability. For historical reasons, 3912 * the sysctl names have varying similarity to the parameter names. Prisons 3913 * just see their own parameters, and can't change them. 3914 */ 3915 static int 3916 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 3917 { 3918 struct prison *pr; 3919 int allow, error, i; 3920 3921 pr = req->td->td_ucred->cr_prison; 3922 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 3923 3924 /* Get the current flag value, and convert it to a boolean. */ 3925 i = (allow & arg2) ? 1 : 0; 3926 if (arg1 != NULL) 3927 i = !i; 3928 error = sysctl_handle_int(oidp, &i, 0, req); 3929 if (error || !req->newptr) 3930 return (error); 3931 i = i ? arg2 : 0; 3932 if (arg1 != NULL) 3933 i ^= arg2; 3934 /* 3935 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 3936 * for writing. 3937 */ 3938 mtx_lock(&prison0.pr_mtx); 3939 jail_default_allow = (jail_default_allow & ~arg2) | i; 3940 mtx_unlock(&prison0.pr_mtx); 3941 return (0); 3942 } 3943 3944 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 3945 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3946 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 3947 "Processes in jail can set their hostnames"); 3948 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 3949 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3950 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 3951 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 3952 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 3953 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3954 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 3955 "Processes in jail can use System V IPC primitives"); 3956 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 3957 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3958 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 3959 "Prison root can create raw sockets"); 3960 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 3961 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3962 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 3963 "Processes in jail can alter system file flags"); 3964 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 3965 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3966 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 3967 "Processes in jail can mount/unmount jail-friendly file systems"); 3968 3969 static int 3970 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 3971 { 3972 struct prison *pr; 3973 int level, error; 3974 3975 pr = req->td->td_ucred->cr_prison; 3976 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 3977 error = sysctl_handle_int(oidp, &level, 0, req); 3978 if (error || !req->newptr) 3979 return (error); 3980 *(int *)arg1 = level; 3981 return (0); 3982 } 3983 3984 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 3985 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 3986 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 3987 sysctl_jail_default_level, "I", 3988 "Processes in jail cannot see all mounted file systems"); 3989 3990 /* 3991 * Nodes to describe jail parameters. Maximum length of string parameters 3992 * is returned in the string itself, and the other parameters exist merely 3993 * to make themselves and their types known. 3994 */ 3995 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 3996 "Jail parameters"); 3997 3998 int 3999 sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4000 { 4001 int i; 4002 long l; 4003 size_t s; 4004 char numbuf[12]; 4005 4006 switch (oidp->oid_kind & CTLTYPE) 4007 { 4008 case CTLTYPE_LONG: 4009 case CTLTYPE_ULONG: 4010 l = 0; 4011 #ifdef SCTL_MASK32 4012 if (!(req->flags & SCTL_MASK32)) 4013 #endif 4014 return (SYSCTL_OUT(req, &l, sizeof(l))); 4015 case CTLTYPE_INT: 4016 case CTLTYPE_UINT: 4017 i = 0; 4018 return (SYSCTL_OUT(req, &i, sizeof(i))); 4019 case CTLTYPE_STRING: 4020 snprintf(numbuf, sizeof(numbuf), "%d", arg2); 4021 return 4022 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4023 case CTLTYPE_STRUCT: 4024 s = (size_t)arg2; 4025 return (SYSCTL_OUT(req, &s, sizeof(s))); 4026 } 4027 return (0); 4028 } 4029 4030 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4031 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4032 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4033 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4034 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4035 "I", "Jail secure level"); 4036 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4037 "I", "Jail cannot see all mounted file systems"); 4038 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4039 "B", "Jail persistence"); 4040 #ifdef VIMAGE 4041 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4042 "B", "Virtual network stack"); 4043 #endif 4044 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4045 "B", "Jail is in the process of shutting down"); 4046 4047 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4048 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4049 "I", "Current number of child jails"); 4050 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4051 "I", "Maximum number of child jails"); 4052 4053 SYSCTL_JAIL_PARAM_NODE(host, "Jail host info"); 4054 SYSCTL_JAIL_PARAM(, nohost, CTLTYPE_INT | CTLFLAG_RW, 4055 "BN", "Jail w/ no host info"); 4056 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4057 "Jail hostname"); 4058 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4059 "Jail NIS domainname"); 4060 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4061 "Jail host UUID"); 4062 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4063 "LU", "Jail host ID"); 4064 4065 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4066 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4067 4068 #ifdef INET 4069 SYSCTL_JAIL_PARAM_NODE(ip4, "Jail IPv4 address virtualization"); 4070 SYSCTL_JAIL_PARAM(, noip4, CTLTYPE_INT | CTLFLAG_RW, 4071 "BN", "Jail w/ no IP address virtualization"); 4072 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4073 "S,in_addr,a", "Jail IPv4 addresses"); 4074 #endif 4075 #ifdef INET6 4076 SYSCTL_JAIL_PARAM_NODE(ip6, "Jail IPv6 address virtualization"); 4077 SYSCTL_JAIL_PARAM(, noip6, CTLTYPE_INT | CTLFLAG_RW, 4078 "BN", "Jail w/ no IP address virtualization"); 4079 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4080 "S,in6_addr,a", "Jail IPv6 addresses"); 4081 #endif 4082 4083 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4084 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4085 "B", "Jail may set hostname"); 4086 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4087 "B", "Jail may use SYSV IPC"); 4088 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4089 "B", "Jail may create raw sockets"); 4090 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4091 "B", "Jail may alter system file flags"); 4092 SYSCTL_JAIL_PARAM(_allow, mount, CTLTYPE_INT | CTLFLAG_RW, 4093 "B", "Jail may mount/unmount jail-friendly file systems"); 4094 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4095 "B", "Jail may set file quotas"); 4096 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4097 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4098 4099 4100 #ifdef DDB 4101 4102 static void 4103 db_show_prison(struct prison *pr) 4104 { 4105 int fi; 4106 #if defined(INET) || defined(INET6) 4107 int ii; 4108 #endif 4109 #ifdef INET6 4110 char ip6buf[INET6_ADDRSTRLEN]; 4111 #endif 4112 4113 db_printf("prison %p:\n", pr); 4114 db_printf(" jid = %d\n", pr->pr_id); 4115 db_printf(" name = %s\n", pr->pr_name); 4116 db_printf(" parent = %p\n", pr->pr_parent); 4117 db_printf(" ref = %d\n", pr->pr_ref); 4118 db_printf(" uref = %d\n", pr->pr_uref); 4119 db_printf(" path = %s\n", pr->pr_path); 4120 db_printf(" cpuset = %d\n", pr->pr_cpuset 4121 ? pr->pr_cpuset->cs_id : -1); 4122 #ifdef VIMAGE 4123 db_printf(" vnet = %p\n", pr->pr_vnet); 4124 #endif 4125 db_printf(" root = %p\n", pr->pr_root); 4126 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4127 db_printf(" childcount = %d\n", pr->pr_childcount); 4128 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4129 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4130 db_printf(" flags = %x", pr->pr_flags); 4131 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4132 fi++) 4133 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4134 db_printf(" %s", pr_flag_names[fi]); 4135 db_printf(" allow = %x", pr->pr_allow); 4136 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4137 fi++) 4138 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4139 db_printf(" %s", pr_allow_names[fi]); 4140 db_printf("\n"); 4141 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4142 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4143 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4144 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4145 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4146 #ifdef INET 4147 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4148 for (ii = 0; ii < pr->pr_ip4s; ii++) 4149 db_printf(" %s %s\n", 4150 ii == 0 ? "ip4 =" : " ", 4151 inet_ntoa(pr->pr_ip4[ii])); 4152 #endif 4153 #ifdef INET6 4154 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4155 for (ii = 0; ii < pr->pr_ip6s; ii++) 4156 db_printf(" %s %s\n", 4157 ii == 0 ? "ip6 =" : " ", 4158 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4159 #endif 4160 } 4161 4162 DB_SHOW_COMMAND(prison, db_show_prison_command) 4163 { 4164 struct prison *pr; 4165 4166 if (!have_addr) { 4167 /* 4168 * Show all prisons in the list, and prison0 which is not 4169 * listed. 4170 */ 4171 db_show_prison(&prison0); 4172 if (!db_pager_quit) { 4173 TAILQ_FOREACH(pr, &allprison, pr_list) { 4174 db_show_prison(pr); 4175 if (db_pager_quit) 4176 break; 4177 } 4178 } 4179 return; 4180 } 4181 4182 if (addr == 0) 4183 pr = &prison0; 4184 else { 4185 /* Look for a prison with the ID and with references. */ 4186 TAILQ_FOREACH(pr, &allprison, pr_list) 4187 if (pr->pr_id == addr && pr->pr_ref > 0) 4188 break; 4189 if (pr == NULL) 4190 /* Look again, without requiring a reference. */ 4191 TAILQ_FOREACH(pr, &allprison, pr_list) 4192 if (pr->pr_id == addr) 4193 break; 4194 if (pr == NULL) 4195 /* Assume address points to a valid prison. */ 4196 pr = (struct prison *)addr; 4197 } 4198 db_show_prison(pr); 4199 } 4200 4201 #endif /* DDB */ 4202